Stop the value command on the untrusted-safe allowlist crashing the daemon

glibc leaves endptr unset for a small invalid base; ERANGE throws instead of clamping.

configure.ac

@@ -1,6 +1,6 @@
 m4_pattern_allow([PKG_CHECK_EXISTS])
 
-AC_INIT([rtorrent],[0.16.20],[sundell.software@gmail.com])
+AC_INIT([rtorrent],[0.16.23],[sundell.software@gmail.com])
 
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_MACRO_DIRS([scripts])
@@ -14,7 +14,7 @@ AX_CXX_COMPILE_STDCXX(20, noext, mandatory)
 
 PKG_PROG_PKG_CONFIG
 
-AC_DEFINE([API_VERSION], [25], [api version])
+AC_DEFINE([API_VERSION], [27], [api version])
 
 RAK_CHECK_CFLAGS
 RAK_CHECK_CXXFLAGS
@@ -22,6 +22,8 @@ RAK_ENABLE_DEBUG
 RAK_ENABLE_EXTRA_DEBUG
 RAK_ENABLE_WERROR
 
+TORRENT_CHECK_ATOMIC
+
 AC_ARG_ENABLE(execinfo,
   AS_HELP_STRING([--disable-execinfo],
     [disable libexecinfo [[default=enable]]]),
@@ -47,7 +49,7 @@ fi
 
 PKG_CHECK_MODULES([CPPUNIT], [cppunit],, [no_cppunit="yes"])
 PKG_CHECK_MODULES([ZLIB], [zlib])
-PKG_CHECK_MODULES([DEPENDENCIES], [libtorrent >= 0.16.20])
+PKG_CHECK_MODULES([DEPENDENCIES], [libtorrent >= 0.16.23])
 
 AC_LANG_PUSH(C++)
 TORRENT_WITH_XMLRPC_C
@@ -68,7 +70,7 @@ AC_DEFINE(USER_AGENT, [std::string(PACKAGE "/" VERSION)], Http user agent)
 
 dnl Only update global build variables immediately before generating the output,
 dnl to avoid affecting the global build environment for other autoconf checks.
-LIBS="$PTHREAD_LIBS $CURSES_LIB $CURSES_LIBS $ZLIB_LIBS $DEPENDENCIES_LIBS $LIBS"
+LIBS="$ATOMIC_LIBS $PTHREAD_LIBS $CURSES_LIB $CURSES_LIBS $ZLIB_LIBS $DEPENDENCIES_LIBS $LIBS"
 CFLAGS="$CFLAGS $PTHREAD_CFLAGS $CURSES_CFLAGS $ZLIB_CFLAGS $DEPENDENCIES_CFLAGS"
 CXXFLAGS="$CXXFLAGS $PTHREAD_CFLAGS $CURSES_CFLAGS $ZLIB_CFLAGS $DEPENDENCIES_CFLAGS"
 

doc/manual/paths.md

@@ -0,0 +1,60 @@
+# Resolving paths
+
+Commands that return a path have `.realpath` variants that resolve it to a
+canonical one, with symlinks followed and any `.` or `..` components removed.
+
+The intent is to make paths safer to hand to an external script.
+A script called through `execute` receives whatever path rtorrent gives it, and
+many scripts do no sanity checking of their own, so resolving the path before it
+leaves rtorrent removes a class of surprises: a download directory that is a
+symlink into somewhere unexpected, or a torrent whose name walks upwards out of
+the directory it is supposed to live in.
+
+    # Instead of this
+    execute = ~/bin/on-finished, (d.base_path)
+
+    # Pass the resolved path
+    execute = ~/bin/on-finished, (d.base_path.realpath.or_throw)
+
+## Available variants
+
+Each command below comes in an `.or_empty` and an `.or_throw` form.
+
+| Command | Resolves |
+| --- | --- |
+| `d.base_path.realpath.*` | `d.base_path` |
+| `d.directory.realpath.*` | `d.directory` |
+| `d.tied_to_file.realpath.*` | `d.tied_to_file` |
+| `d.loaded_file.realpath.*` | `d.loaded_file` |
+| `f.frozen_path.realpath.*` | `f.frozen_path` |
+| `session.path.realpath.*` | `session.path` |
+| `directory.default.realpath.*` | `directory.default` |
+
+A leading `~` is expanded first, exactly as it is for `execute`, so
+`~/downloads` resolves the same way it would on the command line.
+
+## Paths that do not exist
+
+Resolving requires the path to name an existing file or directory, which is
+often not the case for a download whose data has not been written yet.
+The two forms differ only in what they do about it.
+
+`.or_empty` returns an empty string:
+
+    print = (d.base_path.realpath.or_empty)    # ""
+
+This keeps `d.multicall` usable over a view that mixes started and unstarted
+downloads, since a single unresolvable path does not abort the whole call.
+A script receiving one of these paths should still check that it is not empty
+before acting on it.
+
+`.or_throw` raises an error instead:
+
+    print = (d.base_path.realpath.or_throw)    # Could not resolve path: '...'
+
+Prefer this one wherever an unresolvable path means the command should not run
+at all, such as a single `execute` on `event.download.finished`.
+
+Note that a download only has a file list once it has been opened, so
+`d.base_path` and `f.frozen_path` are empty at `event.download.inserted` time
+and their `.realpath` variants resolve nothing.

doc/manual/string_functions.md

@@ -0,0 +1,139 @@
+# String functions
+
+The `string.*` commands manipulate and inspect text from within the
+configuration file.
+They are pure functions with no side effects, so they can be nested freely and
+are safe to call over RPC.
+
+Every argument is converted to its string representation before use, which means
+numbers can be passed where text is expected.
+Commands that count characters, such as `string.length` and `string.substr`, count
+utf-8 characters rather than bytes.
+
+## string.length
+
+    # string.length = «text»
+
+    string.length = "héllo"    # 5
+
+Returns the number of utf-8 characters in the text.
+
+## string.equals
+
+    # string.equals = «text», «other»[, ...]
+
+    string.equals = (d.name), "first.iso", "second.iso"
+
+Returns `1` if the first argument equals any of the following arguments,
+otherwise `0`.
+
+## string.starts_with, string.ends_with
+
+    # string.starts_with = «text», «prefix»[, ...]
+    # string.ends_with = «text», «tail»[, ...]
+
+    string.starts_with = (t.url), "http://", "https://"
+    string.ends_with = (d.name), ".iso"
+
+Returns `1` if the text begins, or ends, with any of the given prefixes or
+tails.
+
+## string.contains, string.contains_i
+
+    # string.contains = «haystack», «needle»[, ...]
+    # string.contains_i = «haystack», «needle»[, ...]
+
+    string.contains = (t.url), "retracker.local"
+    string.contains_i = (t.url), "RETRACKER.local"
+
+Returns `1` if the haystack contains any of the needles.
+The `_i` variant compares case-insensitively, and only handles ascii.
+
+## string.substr
+
+    # string.substr = «text»[, «position»[, «count»[, «default»]]]
+
+    string.substr = "abcdef", 2, 3       # "cde"
+    string.substr = "abcdef", -2         # "ef"
+    string.substr = "abcdef", 10, 1, "?" # "?"
+
+Extracts a part of the text, starting at `position` and spanning `count`
+characters.
+The position defaults to the start of the text, and the count to the rest of it.
+A negative position is relative to the end of the text.
+If the position falls outside the text, the default value is returned instead,
+which is the empty string unless given.
+
+## string.split
+
+    # string.split = «text», «delimiter»
+
+    string.split = "a.b.c", "."    # {"a", "b", "c"}
+    string.split = "abc", ""       # {"a", "b", "c"}
+
+Splits the text into a list, keeping empty fields.
+An empty delimiter splits the text into its utf-8 characters.
+
+## string.join
+
+    # string.join = «delimiter»[, «object»[, ...]]
+
+    string.join = "-", (string.split, "a.b.c", ".")    # "a-b-c"
+
+Concatenates the objects, inserting the delimiter between them.
+Lists are flattened, so the result of `string.split` can be joined back
+together.
+
+## string.lpad, string.rpad
+
+    # string.lpad = «text», «length»[, «padding»]
+    # string.rpad = «text», «length»[, «padding»]
+
+    string.lpad = 7, 3, 0    # "007"
+    string.rpad = "a", 3     # "a  "
+
+Pads the text at the start, or the end, until it is `length` characters long.
+The padding defaults to a single space and is repeated as needed.
+Text that is already long enough is returned unchanged.
+
+## string.strip, string.lstrip, string.rstrip
+
+    # string.strip = «text»[, «strippable»[, ...]]
+    # string.lstrip = «text»[, «head»[, ...]]
+    # string.rstrip = «text»[, «tail»[, ...]]
+
+    string.strip = "  padded  "      # "padded"
+    string.strip = "//path//", "/"   # "path"
+
+Removes characters from both ends of the text, or from only the start or the
+end.
+The arguments after the text form a set of utf-8 characters to remove.
+Without them, whitespace is removed.
+
+## string.map
+
+    # string.map = «text», {«old», «new»}[, ...]
+
+    string.map = (d.state), {0, "stopped"}, {1, "started"}
+
+Returns the replacement of the first pair whose `old` value equals the whole
+text.
+If no pair matches, the text is returned unchanged.
+
+## string.replace
+
+    # string.replace = «text», {«old», «new»}[, ...]
+
+    string.replace = "a-b-c", {"-", "+"}    # "a+b+c"
+
+Replaces every occurrence of `old` with `new`.
+The pairs are applied in order, so a later pair operates on the result of the
+earlier ones.
+
+## Example: dropping unwanted trackers
+
+The following disables every tracker that points at `retracker.local` as soon as
+a download is inserted.
+
+    method.set_key = event.download.inserted, drop_retracker, \
+      ((t.multicall, default, "branch=(string.contains,(t.url),retracker.local),((t.disable))"))

doc/rtorrent.rc

@@ -63,6 +63,14 @@
 #network.local_address.set = 127.0.0.1
 #network.local_address.set = rakshasa.no
 
+# The port reported to the tracker, separate for ipv4/ipv6. A value of 0
+# (the default) falls back to reporting the listening port. network.local_port.set
+# sets both the ipv4 and ipv6 ports at once.
+#
+#network.local_port.set = 6881
+#network.local_port.ipv4.set = 6881
+#network.local_port.ipv6.set = 6882
+
 # The IP address the listening socket and outgoing connections is
 # bound to.
 #
@@ -71,11 +79,11 @@
 
 # Port range to use for listening.
 #
-#network.port_range.set = 6890-6999
+#network.listen.port.range.set = 6890-6999
 
 # Start opening ports at a random position within the port range.
 #
-#network.port_random.set = no
+#network.listen.port.random.set = no
 
 # Set RPC type
 #network.rpc.use_xmlrpc.set = true

doc/rtorrent.rc-example

@@ -23,8 +23,8 @@ execute.throw = sh, -c, (cat,\
     "\"",(cfg.watch),"/start\" ")
 
 # Listening port for incoming peer traffic (fixed; you can also randomize it)
-network.port_range.set = 50000-50000
+network.listen.port.range.set = 50000-50000
-network.port_random.set = no
+network.listen.port.random.set = no
 
 # Tracker-less torrent and UDP tracker support
 # (conservative settings for 'private' trackers, change for 'public')

doc/rtorrent.rc.lua-example

@@ -53,8 +53,8 @@ rc.execute.throw(
              cfg.watch..'/start'}))
 
 -- Listening port for incoming peer traffic (fixed; you can also randomize it)
-rc.network.port_range = '50000-50000'
+rc.network.listen.port.range = '50000-50000'
-rc.network.port_random = false
+rc.network.listen.port.random = false
 
 -- Tracker-less torrent and UDP tracker support
 -- (conservative settings for 'private' trackers, change for 'public')

src/Makefile.am

@@ -194,6 +194,8 @@ libsub_root_a_SOURCES = \
 	command_throttle.cc \
 	command_tracker.cc \
 	command_scheduler.cc \
+	command_string.cc \
+	command_system.cc \
 	command_ui.cc \
 	control.cc \
 	control.h \

src/command_download.cc

@@ -142,16 +142,6 @@ apply_d_delete_tied(core::Download* download) {
   return torrent::Object();
 }
 
-void
-apply_d_directory(core::Download* download, const std::string& name) {
-  if (!download->file_list()->is_multi_file())
-    download->set_root_directory(name);
-  else if (name.empty() || *name.rbegin() == '/')
-    download->set_root_directory(name + download->info()->name().str());
-  else
-    download->set_root_directory(name + "/" + download->info()->name().str());
-}
-
 torrent::Object
 apply_d_connection_type(core::Download* download, const std::string& name) {
   torrent::Download::ConnectionType t =
@@ -412,13 +402,21 @@ p_multicall(core::Download* download, const torrent::Object::list_type& args) {
   auto  resultRaw = torrent::Object::create_list();
   auto& result    = resultRaw.as_list();
 
-  for (const auto& connection : *download->connection_list()) {
+  auto*      connection_list = download->connection_list();
+  const auto change_counter  = connection_list->change_counter();
+
+  for (const auto& connection : *connection_list) {
     torrent::Object::list_type& row = result.insert(result.end(), torrent::Object::create_list())->as_list();
 
     for (auto cItr = ++args.begin(); cItr != args.end(); cItr++) {
       const std::string& cmd = cItr->as_string();
 
       row.push_back(rpc::parse_command(rpc::make_target(connection), cmd.c_str(), cmd.c_str() + cmd.size()).first);
+
+      // Erasing a peer frees it and swaps the last element into its place, so
+      // neither this peer nor the iteration survives a change to the list.
+      if (connection_list->change_counter() != change_counter)
+        throw torrent::input_error("Command changed the connection list during p.multicall.");
     }
   }
 
@@ -441,6 +439,9 @@ p_call_target(const torrent::Object::list_type& args) {
   const std::string& peer_id = itr++->as_string();
   const std::string& command_key = itr++->as_string();
 
+  if (download == nullptr)
+    throw torrent::input_error("invalid parameters: info-hash not found");
+
   torrent::HashString hash;
 
   if (peer_id.size() != 40)
@@ -655,6 +656,8 @@ initialize_command_download() {
   CMD2_DL("d.base_path.as_binary",            [](auto* download, auto) { return retrieve_d_base_path(download).object_as_binary(); });
   CMD2_DL("d.base_path.or_base64",            [](auto* download, auto) { return retrieve_d_base_path(download).object_utf8_or_base64(); });
   CMD2_DL("d.base_path.or_as_binary",         [](auto* download, auto) { return retrieve_d_base_path(download).object_utf8_or_as_binary(); });
+  CMD2_DL("d.base_path.realpath.or_empty",    [](auto* download, auto) { return resolve_path(retrieve_d_base_path(download).str()); });
+  CMD2_DL("d.base_path.realpath.or_throw",    [](auto* download, auto) { return resolve_path_or_throw(retrieve_d_base_path(download).str()); });
   CMD2_DL("d.base_filename",                  [](auto* download, auto) { return retrieve_d_base_filename(download).str(); });
   CMD2_DL("d.base_filename.hex",              [](auto* download, auto) { return retrieve_d_base_filename(download).object_hex(); });
   CMD2_DL("d.base_filename.base64",           [](auto* download, auto) { return retrieve_d_base_filename(download).object_base64(); });
@@ -716,7 +719,7 @@ initialize_command_download() {
   CMD2_DL_V       ("d.pause",      std::bind(&core::DownloadList::pause_default, control->core()->download_list(), std::placeholders::_1));
   CMD2_DL_V       ("d.open",       std::bind(&core::DownloadList::open_throw, control->core()->download_list(), std::placeholders::_1));
   CMD2_DL_V       ("d.close",      std::bind(&core::DownloadList::close_throw, control->core()->download_list(), std::placeholders::_1));
-  CMD2_DL_V       ("d.close.directly", std::bind(&core::DownloadList::close_directly, control->core()->download_list(), std::placeholders::_1));
+  CMD2_DL_V       ("d.close.directly", std::bind(&core::DownloadList::close_files, control->core()->download_list(), std::placeholders::_1));
   CMD2_DL_V       ("d.erase",      std::bind(&core::DownloadList::erase_ptr, control->core()->download_list(), std::placeholders::_1));
   CMD2_DL_V       ("d.check_hash", std::bind(&core::DownloadList::check_hash, control->core()->download_list(), std::placeholders::_1));
 
@@ -771,6 +774,11 @@ initialize_command_download() {
   CMD2_DL_VAR_STRING_PUBLIC("d.tied_to_file", "rtorrent", "tied_to_file");
   CMD2_DL_VAR_STRING("d.loaded_file",  "rtorrent", "loaded_file");
 
+  CMD2_DL("d.tied_to_file.realpath.or_empty", [](auto* download, auto) { return resolve_path(rpc::convert_to_string(download_get_variable(download, "rtorrent", "tied_to_file"))); });
+  CMD2_DL("d.tied_to_file.realpath.or_throw", [](auto* download, auto) { return resolve_path_or_throw(rpc::convert_to_string(download_get_variable(download, "rtorrent", "tied_to_file"))); });
+  CMD2_DL("d.loaded_file.realpath.or_empty",  [](auto* download, auto) { return resolve_path(rpc::convert_to_string(download_get_variable(download, "rtorrent", "loaded_file"))); });
+  CMD2_DL("d.loaded_file.realpath.or_throw",  [](auto* download, auto) { return resolve_path_or_throw(rpc::convert_to_string(download_get_variable(download, "rtorrent", "loaded_file"))); });
+
   // The "state_changed" variable is required to be a valid unix time
   // value, it indicates the last time the torrent changed its state,
   // resume/pause.
@@ -877,10 +885,11 @@ initialize_command_download() {
   CMD2_DL_LIST    ("d.tracker.insert",                std::bind(&download_tracker_insert, std::placeholders::_1, std::placeholders::_2));
   CMD2_DL_VALUE_V ("d.tracker.send_scrape",           [](auto download, uint64_t arg) { download->tracker_controller().scrape_request(arg); });
 
-  CMD2_DL         ("d.directory",          CMD2_ON_FL(root_dir));
+  CMD2_DL         ("d.directory",                   CMD2_ON_FL(root_dir));
-  CMD2_DL_STRING_V("d.directory.set",      std::bind(&apply_d_directory, std::placeholders::_1, std::placeholders::_2));
+  CMD2_DL         ("d.directory.realpath.or_empty", [](auto* download, auto)     { return resolve_path(download->file_list()->root_dir()); });
-  CMD2_DL         ("d.directory_base",     CMD2_ON_FL(root_dir));
+  CMD2_DL         ("d.directory.realpath.or_throw", [](auto* download, auto)     { return resolve_path_or_throw(download->file_list()->root_dir()); });
-  CMD2_DL_STRING_V("d.directory_base.set", std::bind(&core::Download::set_root_directory, std::placeholders::_1, std::placeholders::_2));
+  CMD2_DL_STRING_V("d.directory.set",               [](auto* download, auto arg) { download->set_directory(arg); });
+  CMD2_DL_STRING_V("d.directory.base.set",          [](auto* download, auto arg) { download->set_base_directory(arg); });
 
   CMD2_DL         ("d.priority",     std::bind(&core::Download::priority, std::placeholders::_1));
   CMD2_DL         ("d.priority_str", std::bind(&retrieve_d_priority_str, std::placeholders::_1));
@@ -912,6 +921,14 @@ initialize_command_download() {
   rpc::rpc.mark_safe("d.local_id_html");
   rpc::rpc.mark_safe("d.bitfield");
   rpc::rpc.mark_safe("d.base_path");
+  rpc::rpc.mark_safe("d.base_path.realpath.or_empty");
+  rpc::rpc.mark_safe("d.base_path.realpath.or_throw");
+  rpc::rpc.mark_safe("d.directory.realpath.or_empty");
+  rpc::rpc.mark_safe("d.directory.realpath.or_throw");
+  rpc::rpc.mark_safe("d.tied_to_file.realpath.or_empty");
+  rpc::rpc.mark_safe("d.tied_to_file.realpath.or_throw");
+  rpc::rpc.mark_safe("d.loaded_file.realpath.or_empty");
+  rpc::rpc.mark_safe("d.loaded_file.realpath.or_throw");
   rpc::rpc.mark_safe("d.base_path.hex");
   rpc::rpc.mark_safe("d.base_path.base64");
   rpc::rpc.mark_safe("d.base_path.base64_as_binary");
@@ -933,7 +950,6 @@ initialize_command_download() {
   rpc::rpc.mark_safe("d.name.or_base64");
   rpc::rpc.mark_safe("d.name.or_as_binary");
   rpc::rpc.mark_safe("d.directory");
-  rpc::rpc.mark_safe("d.directory_base");
   rpc::rpc.mark_safe("d.creation_date");
   rpc::rpc.mark_safe("d.load_date");
   rpc::rpc.mark_safe("d.up.rate");

src/command_dynamic.cc

@@ -157,7 +157,7 @@ system_method_insert_object(const torrent::Object::list_type& args, int flags) {
     torrent::Object             valueList     = torrent::Object::create_list();
     torrent::Object::list_type& valueListType = valueList.as_list();
 
-    if ((itrArgs)->is_list())
+    if (itrArgs != args.end() && (itrArgs)->is_list())
       valueListType = (itrArgs)->as_list();
 
     control->object_storage()->insert_str(raw_key, valueList, flags);

src/command_events.cc

@@ -51,7 +51,7 @@ apply_on_ratio(const torrent::Object& rawArgs) {
         !(max_ratio > 0 && total_upload * 100 > total_done * max_ratio))
       continue;
 
-    downloads.push_back(*itr);
+    downloads.push_back(itr->get());
   }
 
   auto ratio_command = "group." + group_name + ".ratio.command";
@@ -128,7 +128,7 @@ apply_remove_untied() {
 }
 
 torrent::Object
-apply_schedule(const torrent::Object::list_type& args) {
+apply_schedule(const torrent::Object::list_type& args, bool if_absent) {
   if (args.size() != 4)
     throw torrent::input_error("Wrong number of arguments.");
 
@@ -138,6 +138,9 @@ apply_schedule(const torrent::Object::list_type& args) {
   auto& arg2 = (itr++)->as_string();
   auto& arg3 = (itr++)->as_string();
 
+  if (if_absent && control->command_scheduler()->find(arg1) != control->command_scheduler()->end())
+    return torrent::Object();
+
   control->command_scheduler()->parse(arg1, arg2, arg3, *itr);
 
   return torrent::Object();
@@ -170,7 +173,7 @@ apply_close_low_diskspace(int64_t arg, uint32_t skip_priority) {
 
   torrent::FileList::cache_list cache;
 
-  for (auto download : *control->core()->download_list()) {
+  for (const auto& download : *control->core()->download_list()) {
     if (!download->is_downloading())
       continue;
     if (download->priority() >= skip_priority)
@@ -237,15 +240,25 @@ d_multicall(const torrent::Object::list_type& args) {
 
   // Add some pre-parsing of the commands, so we don't spend time
   // parsing and searching command map for every single call.
-  std::vector<core::Download*> dlist((*view_itr)->begin_visible(), (*view_itr)->end_visible());
+  // Hold a reference to each download so a command that erases one does not
+  // leave the rest of the loop dispatching on freed memory.
+  core::View::base_type dlist((*view_itr)->begin_visible(), (*view_itr)->end_visible());
 
   torrent::Object             resultRaw = torrent::Object::create_list();
   torrent::Object::list_type& result = resultRaw.as_list();
 
-  for (auto download : dlist) {
+  for (const auto& download : dlist) {
+    if (download.use_count() == 1)
+      continue;
+
     torrent::Object::list_type& row = result.insert(result.end(), torrent::Object::create_list())->as_list();
 
     for (torrent::Object::list_const_iterator cItr = ++args.begin(); cItr != args.end(); cItr++) {
+      // A command may erase this download, which destroys the torrent object it
+      // wraps; the list dropping its reference is what tells us.
+      if (download.use_count() == 1)
+        break;
+
       auto& cmd = cItr->as_string();
       row.push_back(rpc::parse_command(rpc::make_target(download), cmd.c_str(), cmd.c_str() + cmd.size()).first);
     }
@@ -268,10 +281,12 @@ d_multicall_filtered(const torrent::Object::list_type& args) {
   if (view_itr == viewManager->end())
     throw torrent::input_error("Could not find view '" + arg->as_string() + "'.");
 
-  // Make a filtered copy of the current item list
+  // Make a filtered copy of the current item list, holding a reference to each
+  // download so a command that erases one cannot free it under us.
   core::View::base_type dlist;
   (*view_itr)->filter_by(*++arg, dlist);
 
+
   // Generate result by iterating over all items
   auto  resultRaw = torrent::Object::create_list();
   auto& result    = resultRaw.as_list();
@@ -279,11 +294,17 @@ d_multicall_filtered(const torrent::Object::list_type& args) {
   ++arg;  // skip to first command
 
   for (const auto& item : dlist) {
+    if (item.use_count() == 1)
+      continue;
+
     // Add empty row to result
     torrent::Object::list_type& row = result.insert(result.end(), torrent::Object::create_list())->as_list();
 
     // Call the provided commands and assemble their results
     for (torrent::Object::list_const_iterator command = arg; command != args.end(); command++) {
+      if (item.use_count() == 1)
+        break;
+
       auto& cmdstr = command->as_string();
       row.push_back(rpc::parse_command(rpc::make_target(item), cmdstr.c_str(), cmdstr.c_str() + cmdstr.size()).first);
     }
@@ -340,7 +361,8 @@ initialize_command_events() {
   CMD2_ANY         ("close_untied",               [](auto, auto) { return apply_close_untied(); });
   CMD2_ANY         ("remove_untied",              [](auto, auto) { return apply_remove_untied(); });
 
-  CMD2_ANY_LIST    ("schedule",                   [](auto, auto& args) { return apply_schedule(args); });
+  CMD2_ANY_LIST    ("schedule",                   [](auto, auto& args) { return apply_schedule(args, false); });
+  CMD2_ANY_LIST    ("schedule.if_absent",         [](auto, auto& args) { return apply_schedule(args, true); });
   CMD2_ANY_STRING_V("schedule.remove",            [](auto, auto& str) { return control->command_scheduler()->erase_str(str); });
 
   CMD2_ANY_STRING_V("import",                     [](auto, auto& str) { return apply_import(str); });

src/command_file.cc

@@ -116,6 +116,8 @@ initialize_command_file() {
   CMD2_FILE("f.frozen_path.as_binary",            [](auto* file, auto)   { return file->frozen_path().object_as_binary(); });
   CMD2_FILE("f.frozen_path.or_base64",            [](auto* file, auto)   { return file->frozen_path().object_utf8_or_base64(); });
   CMD2_FILE("f.frozen_path.or_as_binary",         [](auto* file, auto)   { return file->frozen_path().object_utf8_or_as_binary(); });
+  CMD2_FILE("f.frozen_path.realpath.or_empty",    [](auto* file, auto)   { return resolve_path(file->frozen_path().str()); });
+  CMD2_FILE("f.frozen_path.realpath.or_throw",    [](auto* file, auto)   { return resolve_path_or_throw(file->frozen_path().str()); });
 
   CMD2_FILE("f.match_depth_prev",       std::bind(&torrent::File::match_depth_prev, std::placeholders::_1));
   CMD2_FILE("f.match_depth_next",       std::bind(&torrent::File::match_depth_next, std::placeholders::_1));
@@ -129,6 +131,8 @@ initialize_command_file() {
   rpc::rpc.mark_safe("f.path_components");
   rpc::rpc.mark_safe("f.path_depth");
   rpc::rpc.mark_safe("f.frozen_path");
+  rpc::rpc.mark_safe("f.frozen_path.realpath.or_empty");
+  rpc::rpc.mark_safe("f.frozen_path.realpath.or_throw");
   rpc::rpc.mark_safe("f.frozen_path.hex");
   rpc::rpc.mark_safe("f.frozen_path.base64");
   rpc::rpc.mark_safe("f.frozen_path.base64_as_binary");

src/command_groups.cc

@@ -1,5 +1,7 @@
 #include "config.h"
 
+#include <memory>
+
 #include <torrent/download/resource_manager.h>
 #include <torrent/download/choke_group.h>
 #include <torrent/download/choke_queue.h>
@@ -111,7 +113,7 @@ apply_cg_all_update_balance(bool is_up) {
 //
 #else
 
-std::vector<torrent::choke_group*> cg_list_hack;
+std::vector<std::unique_ptr<torrent::choke_group>> cg_list_hack;
 
 int64_t
 cg_get_index(const torrent::Object& raw_args) {
@@ -121,7 +123,7 @@ cg_get_index(const torrent::Object& raw_args) {
 
   if (arg.is_string()) {
     if (!rpc::parse_whole_value_nothrow(arg.as_string().c_str(), &index)) {
-      auto itr = std::find_if(cg_list_hack.begin(), cg_list_hack.end(), [&arg](torrent::choke_group* cg) { return arg.as_string() == cg->name(); });
+      auto itr = std::find_if(cg_list_hack.begin(), cg_list_hack.end(), [&arg](const auto& cg) { return arg.as_string() == cg->name(); });
 
       if (itr == cg_list_hack.end())
         throw torrent::input_error("Choke group not found.");
@@ -149,7 +151,7 @@ cg_get_group(const torrent::Object& raw_args) {
   if ((size_t)index >= cg_list_hack.size())
     throw torrent::input_error("Choke group not found.");
 
-  return cg_list_hack.at(index);
+  return cg_list_hack.at(index).get();
 }
 
 int64_t cg_d_group(core::Download* download) { return download->group(); }
@@ -162,7 +164,7 @@ torrent::Object
 apply_cg_list() {
   torrent::Object::list_type result;
 
-  for (auto itr : cg_list_hack)
+  for (const auto& itr : cg_list_hack)
     result.push_back(itr->name());
 
   return torrent::Object::from_list(result);
@@ -180,10 +182,10 @@ apply_cg_insert(const std::string& arg) {
   if (rpc::parse_whole_value_nothrow(arg.c_str(), &dummy))
     throw torrent::input_error("Cannot use a value string as choke group name.");
 
-  if (arg.empty() || std::any_of(cg_list_hack.begin(), cg_list_hack.end(), [&arg](auto cg) { return arg == cg->name(); }))
+  if (arg.empty() || std::any_of(cg_list_hack.begin(), cg_list_hack.end(), [&arg](const auto& cg) { return arg == cg->name(); }))
     throw torrent::input_error("Duplicate name for choke group.");
 
-  cg_list_hack.push_back(new torrent::choke_group());
+  cg_list_hack.push_back(std::make_unique<torrent::choke_group>());
   cg_list_hack.back()->set_name(arg);
 
   cg_list_hack.back()->up_queue()->set_heuristics(torrent::HEURISTICS_UPLOAD_LEECH);
@@ -194,7 +196,7 @@ apply_cg_insert(const std::string& arg) {
 
 torrent::Object
 apply_cg_index_of(const std::string& arg) {
-  auto itr = std::find_if(cg_list_hack.begin(), cg_list_hack.end(), [&arg](torrent::choke_group* cg) { return arg == cg->name(); });
+  auto itr = std::find_if(cg_list_hack.begin(), cg_list_hack.end(), [&arg](const auto& cg) { return arg == cg->name(); });
 
   if (itr == cg_list_hack.end())
     throw torrent::input_error("Choke group not found.");
@@ -206,7 +208,7 @@ torrent::Object
 apply_cg_all_update_balance(bool is_up) {
   LT_LOG_SUBSYSTEM("apply update balance: hack is_up:%i", (int)is_up);
 
-  for (auto itr : cg_list_hack) {
+  for (const auto& itr : cg_list_hack) {
     if (is_up)
       itr->up_queue()->balance();
     else
@@ -346,7 +348,7 @@ initialize_command_groups() {
 #else
   apply_cg_insert("default");
 
-  CMD_ANY         ("choke_group.size",                std::bind(&std::vector<torrent::choke_group*>::size, cg_list_hack));
+  CMD_ANY         ("choke_group.size",                [](auto, auto) { return (int64_t)cg_list_hack.size(); });
   CMD_ANY_STRING  ("choke_group.index_of",            std::bind(&apply_cg_index_of, std::placeholders::_2));
 #endif
 

src/command_helpers.cc

@@ -19,6 +19,8 @@ void initialize_command_groups();
 void initialize_command_throttle();
 void initialize_command_tracker();
 void initialize_command_scheduler();
+void initialize_command_string();
+void initialize_command_system();
 void initialize_command_ui();
 
 void
@@ -37,4 +39,6 @@ initialize_commands() {
   initialize_command_throttle();
   initialize_command_tracker();
   initialize_command_scheduler();
+  initialize_command_string();
+  initialize_command_system();
 }

src/command_ip.cc

@@ -131,7 +131,7 @@ ipv4_range_parse(const char* address, uint32_t* address_start, uint32_t* address
   // copy everything up to '#'  to address_copy and work from there
   while(address[address_start_index] != '#' && address[address_start_index] != '\r' &&
         address[address_start_index] != '\n' && address[address_start_index] != '\0' &&
-        address_start_index < 4096 ) {
+        address_start_index < 4095 ) {
 
     address_copy[address_start_index] = address[address_start_index];
     address_start_index++;
@@ -206,6 +206,9 @@ ipv4_range_parse(const char* address, uint32_t* address_start, uint32_t* address
         if (mask_bits == 0) {
           mask = 0;
           end_mask = ~(uint32_t)0;
+        } else if (mask_bits == 32) {
+          mask = ~(uint32_t)0;
+          end_mask = 0;
         } else {
           mask = (~mask) << (32-mask_bits);
           end_mask = (~end_mask) >> mask_bits;
@@ -316,6 +319,11 @@ apply_ipv4_filter_load(const torrent::Object::list_type& args) {
       ipv4_filter_parse(buffer, value);
     }
 
+    if (file.fail() && !file.eof()) {
+      lineNumber++;
+      throw torrent::input_error("Exceeded max line length.");
+    }
+
   } catch (torrent::input_error& e) {
     snprintf(buffer, 2048, "Error in ip filter file: %s:%u: %s", filename.c_str(), lineNumber, e.what());
 
@@ -336,8 +344,8 @@ apply_ipv4_filter_dump() {
   torrent::Object raw_result = torrent::Object::create_list();
   torrent::Object::list_type& result = raw_result.as_list();
 
-  torrent::ipv4_table::range_map_type range_map = torrent::PeerList::ipv4_filter()->range_map;
+  const torrent::ipv4_table::range_map_type& range_map = torrent::PeerList::ipv4_filter()->range_map;
-  torrent::ipv4_table::range_map_type::iterator iter = range_map.begin();
+  torrent::ipv4_table::range_map_type::const_iterator iter = range_map.begin();
 
   while(iter != range_map.end()) {
     char buffer[64];

src/command_local.cc

@@ -1,33 +1,16 @@
 #include "config.h"
 
-#include <cerrno>
-#include <fcntl.h>
-#include <functional>
-#include <stdio.h>
-#include <unistd.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <torrent/torrent.h>
-#include <torrent/data/file_manager.h>
-#include <torrent/data/chunk_utils.h>
-#include <torrent/runtime/runtime.h>
 #include <torrent/runtime/memory_manager.h>
-#include <torrent/runtime/socket_manager.h>
+#include <torrent/utils/log.h>
-#include <torrent/utils/chrono.h>
-#include <torrent/utils/option_strings.h>
 
+#include "command_helpers.h"
+#include "control.h"
 #include "core/download.h"
-#include "core/download_list.h"
 #include "core/manager.h"
 #include "rpc/parse_commands.h"
+#include "rpc/lua.h"
 #include "rpc/scgi.h"
 #include "session/session_manager.h"
-#include "utils/file_status_cache.h"
-
-#include "globals.h"
-#include "rpc/lua.h"
-#include "control.h"
-#include "command_helpers.h"
 
 typedef torrent::ChunkManager CM_t;
 typedef torrent::FileManager  FM_t;
@@ -43,49 +26,6 @@ apply_pieces_stats_total_size() {
   return size;
 }
 
-torrent::Object
-system_env(const torrent::Object::string_type& arg) {
-  if (arg.empty())
-    throw torrent::input_error("system.env: Missing variable name.");
-
-  char* val = getenv(arg.c_str());
-  return std::string(val ? val : "");
-}
-
-torrent::Object
-system_hostname() {
-  char buffer[1024];
-
-  if (gethostname(buffer, 1023) == -1)
-    throw torrent::input_error("Unable to read hostname.");
-
-//   if (shorten)
-//     *std::find(buffer, buffer + 1023, '.') = '\0';
-
-  return std::string(buffer);
-}
-
-torrent::Object
-system_get_cwd() {
-  char* buffer = getcwd(NULL, 0);
-
-  if (buffer == NULL)
-    throw torrent::input_error("Unable to read cwd.");
-
-  torrent::Object result = torrent::Object(std::string(buffer));
-  free(buffer);
-
-  return result;
-}
-
-torrent::Object
-system_set_cwd(const torrent::Object::string_type& rawArgs) {
-  if (::chdir(rawArgs.c_str()) != 0)
-    throw torrent::input_error("Could not change current working directory.");
-
-  return torrent::Object();
-}
-
 inline torrent::Object::list_const_iterator
 post_increment(torrent::Object::list_const_iterator& itr, const torrent::Object::list_const_iterator& last) {
   if (itr == last)
@@ -187,92 +127,17 @@ cmd_file_append(const torrent::Object::list_type& args) {
 
 void
 initialize_command_local() {
-  core::DownloadList*    dList = control->core()->download_list();
+  core::DownloadList* dList = control->core()->download_list();
-  torrent::FileManager*  fileManager = torrent::file_manager();
-
-  CMD_ANY         ("system.hostname", std::bind(&system_hostname));
-  CMD_ANY         ("system.pid",      std::bind(&getpid));
-
-  CMD_VAR_C_STRING("system.api_version",           (int64_t)API_VERSION);
-  CMD_VAR_C_STRING("system.client_version",        PACKAGE_VERSION);
-  CMD_VAR_C_STRING("system.library_version",       torrent::runtime::version());
-
-  CMD_VAR_VALUE   ("system.file.allocate",         0);
-  CMD_VAR_VALUE   ("system.file.max_size",         (int64_t)512 << 30);
-  CMD_VAR_VALUE   ("system.file.split_size",       -1);
-  CMD_VAR_STRING  ("system.file.split_suffix",     ".part");
-
-  CMD_ANY         ("system.file_status_cache.size",   std::bind(&utils::FileStatusCache::size,
-                                                                 (utils::FileStatusCache::base_type*)control->core()->file_status_cache()));
-  CMD_ANY_V       ("system.file_status_cache.prune",  std::bind(&utils::FileStatusCache::prune, control->core()->file_status_cache()));
-
-  CMD_VAR_BOOL    ("file.prioritize_toc",          0);
-  CMD_VAR_LIST    ("file.prioritize_toc.first");
-  CMD_VAR_LIST    ("file.prioritize_toc.last");
-
-  CMD_ANY         ("system.files.advise_random",             std::bind(&FM_t::advise_random, fileManager));
-  CMD_ANY_VALUE_V ("system.files.advise_random.set",         std::bind(&FM_t::set_advise_random, fileManager, std::placeholders::_2));
-  CMD_ANY         ("system.files.advise_random.hashing",     std::bind(&FM_t::advise_random_hashing, fileManager));
-  CMD_ANY_VALUE_V ("system.files.advise_random.hashing.set", std::bind(&FM_t::set_advise_random_hashing, fileManager, std::placeholders::_2));
-  CMD_ANY         ("system.files.session.fdatasync",         [](auto, auto)        { return session_thread::manager()->use_fsyncdisk(); });
-  CMD_ANY_VALUE_V ("system.files.session.fdatasync.set",     [](auto, auto& value) { return session_thread::manager()->set_use_fsyncdisk(value); });
-
-  CMD_ANY         ("system.files.opened_counter",     std::bind(&FM_t::files_opened_counter, fileManager));
-  CMD_ANY         ("system.files.closed_counter",     std::bind(&FM_t::files_closed_counter, fileManager));
-  CMD_ANY         ("system.files.failed_counter",     std::bind(&FM_t::files_failed_counter, fileManager));
-
-  CMD_ANY_STRING  ("system.env",                      [](auto, auto& str)   { return system_env(str); });
-
-  CMD_ANY         ("system.time",                     [](auto, auto)        { return torrent::this_thread::cached_seconds().count(); });
-  CMD_ANY         ("system.time_seconds",             [](auto, auto)        { return torrent::utils::cast_seconds(torrent::utils::time_since_epoch()).count(); });
-  CMD_ANY         ("system.time_usec",                [](auto, auto)        { return torrent::utils::time_since_epoch().count(); });
-
-  CMD_ANY_VALUE_V ("system.umask.set",                [](auto, auto& value) { return ::umask(value); });
-
-  CMD_VAR_BOOL    ("system.daemon",                   false);
-
-  CMD_ANY_V       ("system.shutdown.normal",          [](auto, auto)        { control->receive_normal_shutdown(); });
-  CMD_ANY_V       ("system.shutdown.quick",           [](auto, auto)        { control->receive_quick_shutdown(); });
-
-  CMD_REDIRECT_NO_EXPORT("system.shutdown", "system.shutdown.normal");
-
-  CMD_ANY         ("system.cwd",                      [](auto, auto)        { return system_get_cwd(); });
-  CMD_ANY_STRING  ("system.cwd.set",                  [](auto, auto& str)   { return system_set_cwd(str); });
-
-  CMD_ANY         ("system.sockets.size",             [](auto, auto)        { return torrent::runtime::socket_manager()->size(); });
-  CMD_ANY         ("system.sockets.max_size",         [](auto, auto)        { return torrent::runtime::socket_manager()->max_size(); });
-  CMD_ANY_VALUE_V ("system.sockets.max_size.set",     [](auto, auto& value) { return torrent::runtime::socket_manager()->set_max_size_and_adjust(value); });
-  CMD_ANY_V       ("system.sockets.adjust_alloc",     [](auto, auto)        { torrent::runtime::socket_manager()->adjust_allocation(); });
-  CMD_ANY         ("system.sockets.reserved_alloc",   [](auto, auto)        { return torrent::runtime::socket_manager()->reserved_allocation(); });
-  CMD_ANY         ("system.sockets.available_alloc",  [](auto, auto)        { return torrent::runtime::socket_manager()->available_allocation(); });
-
-  for (uint32_t i = 0; i < torrent::runtime::SocketManager::category_count; ++i) {
-    auto category      = static_cast<torrent::runtime::socket_manager_category_t>(i);
-    auto category_name = "system.sockets." + torrent::option_to_str_or_throw(torrent::OPTION_SOCKET_CATEGORY, i);
-
-    CMD_ANY        (category_name + ".size",      [category](auto, auto) { return torrent::runtime::socket_manager()->category_managed_size(category); });
-    CMD_ANY        (category_name + ".max_size",  [category](auto, auto) { return torrent::runtime::socket_manager()->category_max_size(category); });
-
-    if (i == 0) {
-      CMD_ANY      (category_name + ".min_alloc",   [](auto, auto) { return torrent::runtime::socket_manager()->generic_min_allocation(); });
-      continue;
-    }
-
-    CMD_ANY        (category_name + ".min_alloc",     [category](auto, auto) { return torrent::runtime::socket_manager()->category_min_allocation(category); });
-    CMD_ANY        (category_name + ".max_alloc",     [category](auto, auto) { return torrent::runtime::socket_manager()->category_max_allocation(category); });
-    CMD_ANY_VALUE_V(category_name + ".min_alloc.set", [category](auto, auto& value) { torrent::runtime::socket_manager()->set_category_min_allocation(category, value); });
-    CMD_ANY_VALUE_V(category_name + ".max_alloc.set", [category](auto, auto& value) { torrent::runtime::socket_manager()->set_category_max_allocation(category, value); });
-  }
 
   CMD_ANY         ("pieces.sync.always_safe",         [](auto, auto)        { return torrent::runtime::memory_manager()->safe_sync(); });
   CMD_ANY_VALUE_V ("pieces.sync.always_safe.set",     [](auto, auto& value) { return torrent::runtime::memory_manager()->set_safe_sync(value); });
   CMD_ANY         ("pieces.sync.safe_free_diskspace", [](auto, auto)        { return torrent::runtime::memory_manager()->sync_safe_free_diskspace(); });
   CMD_ANY         ("pieces.sync.timeout",             [](auto, auto)        { return torrent::runtime::memory_manager()->timeout_sync().count(); });
   CMD_ANY_VALUE_V ("pieces.sync.timeout.set",         [](auto, auto& value) { return torrent::runtime::memory_manager()->set_timeout_sync(value); });
-  // CMD_ANY         ("pieces.sync.timeout_safe",        [](auto, auto)        { return torrent::runtime::memory_manager()->timeout_safe_sync(); });
-  // CMD_ANY_VALUE_V ("pieces.sync.timeout_safe.set",    [](auto, auto& value) { return torrent::runtime::memory_manager()->set_timeout_safe_sync(value); });
   CMD_ANY         ("pieces.sync.timeout_safe",        [](auto, auto)        { return 0; });
-  CMD_ANY_VALUE_V ("pieces.sync.timeout_safe.set",    [](auto, auto)        { });
+  CMD_ANY_VALUE_V ("pieces.sync.timeout_safe.set",    [](auto, auto)        {
+      lt_log_print(torrent::LOG_WARN, "pieces.sync.timeout_safe.set is no longer supported and does nothing.");
+    });
   CMD_ANY         ("pieces.sync.queue_size",          [](auto, auto)        { return torrent::runtime::memory_manager()->sync_queue_block_count(); });
 
   CMD_ANY         ("pieces.preload.type",             [](auto, auto)        { return torrent::runtime::memory_manager()->preload_type(); });
@@ -296,9 +161,13 @@ initialize_command_local() {
   CMD_VAR_BOOL    ("pieces.hash.on_completion",       true);
 
   CMD_VAR_STRING  ("directory.default",               "./");
+  CMD_ANY         ("directory.default.realpath.or_empty", [](auto, auto)    { return resolve_path(rpc::call_command_string("directory.default")); });
+  CMD_ANY         ("directory.default.realpath.or_throw", [](auto, auto)    { return resolve_path_or_throw(rpc::call_command_string("directory.default")); });
 
   CMD_VAR_STRING  ("session.name",                    "");
   CMD_ANY         ("session.path",                    [](auto, auto)        { return session_thread::manager()->path(); });
+  CMD_ANY         ("session.path.realpath.or_empty",  [](auto, auto)        { return resolve_path(session_thread::manager()->path()); });
+  CMD_ANY         ("session.path.realpath.or_throw",  [](auto, auto)        { return resolve_path_or_throw(session_thread::manager()->path()); });
   CMD_ANY_STRING_V("session.path.set",                [](auto, auto& str)   { return session_thread::manager()->set_path(str); });
   CMD_ANY         ("session.use_lock",                [](auto, auto)        { return session_thread::manager()->use_lock(); });
   CMD_ANY_VALUE_V ("session.use_lock.set",            [](auto, auto& value) { return session_thread::manager()->set_use_lock(value); });
@@ -343,35 +212,12 @@ initialize_command_local() {
 
   CMD_ANY_LIST  ("group.insert", std::bind(&group_insert, std::placeholders::_2));
 
-  rpc::rpc.mark_safe("system.api_version");
-  rpc::rpc.mark_safe("system.client_version");
-  rpc::rpc.mark_safe("system.library_version");
-  rpc::rpc.mark_safe("system.file.max_size");
-  rpc::rpc.mark_safe("system.file.split_size");
-  rpc::rpc.mark_safe("system.file.split_suffix");
-
-  rpc::rpc.mark_safe("system.sockets.size");
-  rpc::rpc.mark_safe("system.sockets.max_size");
-  rpc::rpc.mark_safe("system.sockets.reserved_alloc");
-  rpc::rpc.mark_safe("system.sockets.available_alloc");
-
-  for (uint32_t i = 0; i < torrent::runtime::SocketManager::category_count; ++i) {
-    auto category_name = "system.sockets." + torrent::option_to_str_or_throw(torrent::OPTION_SOCKET_CATEGORY, i);
-
-    rpc::rpc.mark_safe(category_name + ".size");
-    rpc::rpc.mark_safe(category_name + ".max_size");
-
-    if (i == 0) {
-      rpc::rpc.mark_safe(category_name + ".min_alloc");
-      continue;
-    }
-
-    rpc::rpc.mark_safe(category_name + ".min_alloc");
-    rpc::rpc.mark_safe(category_name + ".max_alloc");
-  }
-
   rpc::rpc.mark_safe("directory.default");
   rpc::rpc.mark_safe("session.path");
+  rpc::rpc.mark_safe("session.path.realpath.or_empty");
+  rpc::rpc.mark_safe("session.path.realpath.or_throw");
+  rpc::rpc.mark_safe("directory.default.realpath.or_empty");
+  rpc::rpc.mark_safe("directory.default.realpath.or_throw");
   rpc::rpc.mark_safe("session.use_lock");
   rpc::rpc.mark_safe("session.on_completion");
 

src/command_logging.cc

@@ -122,7 +122,10 @@ log_vmmap_dump(const std::string& str) {
     fprintf(log_file, "%8p-%8p [%5llxk]\n", all_mapping.ptr, (char*)all_mapping.ptr + all_mapping.length, (long long unsigned int)(all_mapping.length / 1024));
   }
 
-  fclose(log_file);
+  // The buffered output only reaches the kernel here.
+  if (fclose(log_file) != 0)
+    throw torrent::input_error("Could not write log file: " + str);
+
   return torrent::Object();
 }
 
@@ -135,7 +138,7 @@ initialize_command_logging() {
   CMD2_ANY_LIST    ("log.open_gz_file_pid",   std::bind(&apply_log_open, log_flag_append_pid | log_flag_use_gz, std::placeholders::_2));
   CMD2_ANY_LIST    ("log.append_file",        std::bind(&apply_log_open, log_flag_append_file, std::placeholders::_2));
   CMD2_ANY_LIST    ("log.append_file.flush",  std::bind(&apply_log_open, log_flag_append_file | log_flag_flush, std::placeholders::_2));
-  CMD2_ANY_LIST    ("log.append_gz_file",     std::bind(&apply_log_open, log_flag_append_file, std::placeholders::_2));
+  CMD2_ANY_LIST    ("log.append_gz_file",     std::bind(&apply_log_open, log_flag_append_file | log_flag_use_gz, std::placeholders::_2));
 
   CMD2_ANY_STRING_V("log.close",            std::bind(&torrent::log_close_output_str, std::placeholders::_2));
 

src/command_network.cc

@@ -54,6 +54,14 @@ set_listen_port_range(const std::string& arg) {
   torrent::runtime::client_config()->set_listen_port_range(port_first, port_last);
 }
 
+uint16_t
+checked_local_port_value(int64_t value, const char* label) {
+  if (value < 0 || value > 65535)
+    throw torrent::input_error(std::string("Invalid ") + label + " port number.");
+
+  return static_cast<uint16_t>(value);
+}
+
 torrent::Object
 get_encryption() {
   auto encryption_modes = torrent::runtime::network_config()->encryption_modes();
@@ -366,18 +374,31 @@ initialize_command_network() {
   CMD_ANY_STRING  ("network.tos.set",                        [](auto, auto& str)             { return apply_tos(str); });
 
   CMD_ANY         ("network.bind_address",                   [nw_config](auto, auto)         { return nw_config->bind_address_best_match_str(); });
-  CMD_ANY_STRING_V("network.bind_address.set",               [nw_config](auto, auto& str)    { return nw_config->set_bind_address_str(str); });
+  CMD_ANY_STRING_V("network.bind_address.set",               [nw_config](auto, auto& str)    { return nw_config->set_bind_address(str); });
   CMD_ANY         ("network.bind_address.ipv4",              [nw_config](auto, auto)         { return nw_config->bind_inet_address_str(); });
-  CMD_ANY_STRING_V("network.bind_address.ipv4.set",          [nw_config](auto, auto& str)    { return nw_config->set_bind_inet_address_str(str); });
+  CMD_ANY_STRING_V("network.bind_address.ipv4.set",          [nw_config](auto, auto& str)    { return nw_config->set_bind_inet_address(str); });
   CMD_ANY         ("network.bind_address.ipv6",              [nw_config](auto, auto)         { return nw_config->bind_inet6_address_str(); });
-  CMD_ANY_STRING_V("network.bind_address.ipv6.set",          [nw_config](auto, auto& str)    { return nw_config->set_bind_inet6_address_str(str); });
+  CMD_ANY_STRING_V("network.bind_address.ipv6.set",          [nw_config](auto, auto& str)    { return nw_config->set_bind_inet6_address(str); });
+
+  CMD_ANY_STRING_V("network.bind_device.set",                [nw_config](auto, auto& str)    { return nw_config->set_bind_device_name(str); });
+  CMD_ANY         ("network.bind_device.ipv4",               [nw_config](auto, auto)         { return nw_config->bind_inet_device_name(); });
+  CMD_ANY_STRING_V("network.bind_device.ipv4.set",           [nw_config](auto, auto& str)    { return nw_config->set_bind_inet_device_name(str); });
+  CMD_ANY         ("network.bind_device.ipv6",               [nw_config](auto, auto)         { return nw_config->bind_inet6_device_name(); });
+  CMD_ANY_STRING_V("network.bind_device.ipv6.set",           [nw_config](auto, auto& str)    { return nw_config->set_bind_inet6_device_name(str); });
 
   CMD_ANY         ("network.local_address",                  [nw_config](auto, auto)         { return nw_config->local_address_best_match_str(); });
-  CMD_ANY_STRING_V("network.local_address.set",              [nw_config](auto, auto& str)    { return nw_config->set_local_address_str(str); });
+  CMD_ANY_STRING_V("network.local_address.set",              [nw_config](auto, auto& str)    { return nw_config->set_local_address(str); });
   CMD_ANY         ("network.local_address.ipv4",             [nw_config](auto, auto)         { return nw_config->local_inet_address_str(); });
-  CMD_ANY_STRING_V("network.local_address.ipv4.set",         [nw_config](auto, auto& str)    { return nw_config->set_local_inet_address_str(str); });
+  CMD_ANY_STRING_V("network.local_address.ipv4.set",         [nw_config](auto, auto& str)    { return nw_config->set_local_inet_address(str); });
   CMD_ANY         ("network.local_address.ipv6",             [nw_config](auto, auto)         { return nw_config->local_inet6_address_str(); });
-  CMD_ANY_STRING_V("network.local_address.ipv6.set",         [nw_config](auto, auto& str)    { return nw_config->set_local_inet6_address_str(str); });
+  CMD_ANY_STRING_V("network.local_address.ipv6.set",         [nw_config](auto, auto& str)    { return nw_config->set_local_inet6_address(str); });
+
+  CMD_ANY         ("network.local_port",                     [nw_config](auto, auto)         { return nw_config->local_port_best_match(); });
+  CMD_ANY_VALUE_V ("network.local_port.set",                 [nw_config](auto, auto& value)  { return nw_config->set_local_port(checked_local_port_value(value, "local")); });
+  CMD_ANY         ("network.local_port.ipv4",                [nw_config](auto, auto)         { return nw_config->local_inet_port(); });
+  CMD_ANY_VALUE_V ("network.local_port.ipv4.set",            [nw_config](auto, auto& value)  { return nw_config->set_local_inet_port(checked_local_port_value(value, "local ipv4")); });
+  CMD_ANY         ("network.local_port.ipv6",                [nw_config](auto, auto)         { return nw_config->local_inet6_port(); });
+  CMD_ANY_VALUE_V ("network.local_port.ipv6.set",            [nw_config](auto, auto& value)  { return nw_config->set_local_inet6_port(checked_local_port_value(value, "local ipv6")); });
 
   CMD_ANY         ("network.proxy.global",                   [](auto, auto)                  { return torrent::runtime::proxy_manager()->proxy_url(); });
   CMD_ANY_STRING_V("network.proxy.global.set",               [](auto, auto& str)             { return torrent::runtime::proxy_manager()->set_proxy_url(str); });
@@ -437,6 +458,9 @@ initialize_command_network() {
   rpc::rpc.mark_safe("network.receive_buffer.size");
   rpc::rpc.mark_safe("network.bind_address");
   rpc::rpc.mark_safe("network.local_address");
+  rpc::rpc.mark_safe("network.local_port");
+  rpc::rpc.mark_safe("network.local_port.ipv4");
+  rpc::rpc.mark_safe("network.local_port.ipv6");
   rpc::rpc.mark_safe("network.xmlrpc.size_limit");
   rpc::rpc.mark_safe("network.open_sockets");
 

src/command_string.cc

@@ -0,0 +1,365 @@
+#include "config.h"
+
+#include <algorithm>
+#include <cctype>
+#include <iterator>
+#include <set>
+#include <string>
+#include <utility>
+#include <vector>
+#include <torrent/exceptions.h>
+#include <torrent/object.h>
+
+#include "rpc/parse.h"
+#include "rpc/rpc_manager.h"
+
+#include "globals.h"
+#include "control.h"
+#include "command_helpers.h"
+
+namespace {
+
+constexpr int64_t max_string_pad_size = 1 << 14;
+
+const std::string whitespace_characters = " \t\n\r\f\v";
+
+// The byte offset of every utf-8 character in 'text', terminated by the offset
+// past the last character. Bytes that are not valid utf-8 lead bytes are
+// treated as single characters.
+std::vector<size_t>
+utf8_offsets(const std::string& text) {
+  std::vector<size_t> offsets;
+
+  for (size_t i = 0; i < text.size(); i++)
+    if (i == 0 || (static_cast<unsigned char>(text[i]) & 0xC0) != 0x80)
+      offsets.push_back(i);
+
+  offsets.push_back(text.size());
+  return offsets;
+}
+
+int64_t
+utf8_length(const std::string& text) {
+  int64_t result = 0;
+
+  for (size_t i = 0; i < text.size(); i++)
+    if (i == 0 || (static_cast<unsigned char>(text[i]) & 0xC0) != 0x80)
+      result++;
+
+  return result;
+}
+
+std::string
+utf8_substr(const std::string& text, const std::vector<size_t>& offsets, size_t first, size_t last) {
+  return text.substr(offsets[first], offsets[last] - offsets[first]);
+}
+
+std::set<std::string>
+utf8_character_set(const std::string& text) {
+  auto offsets = utf8_offsets(text);
+  std::set<std::string> result;
+
+  for (size_t i = 0; i + 1 < offsets.size(); i++)
+    result.insert(utf8_substr(text, offsets, i, i + 1));
+
+  return result;
+}
+
+std::string
+ascii_lowercase(std::string text) {
+  std::transform(text.begin(), text.end(), text.begin(), [](unsigned char c) { return std::tolower(c); });
+  return text;
+}
+
+// A 'max_count' of zero means the command accepts any number of arguments.
+void
+verify_argument_count(const char* name, const torrent::Object::list_type& args, size_t min_count, size_t max_count) {
+  if (args.size() < min_count || (max_count != 0 && args.size() > max_count))
+    throw torrent::input_error(std::string(name) + ": invalid number of arguments.");
+}
+
+const torrent::Object&
+argument_at(const torrent::Object::list_type& args, size_t index) {
+  return *std::next(args.begin(), index);
+}
+
+void
+flatten_argument(const torrent::Object& arg, std::vector<std::string>* dest) {
+  if (!arg.is_list()) {
+    dest->push_back(rpc::convert_to_string(arg));
+    return;
+  }
+
+  for (const auto& child : arg.as_list())
+    flatten_argument(child, dest);
+}
+
+// The {old, new} pairs shared by 'string.map' and 'string.replace'.
+std::pair<std::string, std::string>
+argument_to_pair(const char* name, const torrent::Object& arg) {
+  if (!arg.is_list() || arg.as_list().size() != 2)
+    throw torrent::input_error(std::string(name) + ": arguments after the text must be {old, new} pairs.");
+
+  return {rpc::convert_to_string(arg.as_list().front()), rpc::convert_to_string(arg.as_list().back())};
+}
+
+// Compares the first argument against every remaining argument, returning true
+// as soon as one of them matches.
+torrent::Object
+apply_string_predicate(const char* name, const torrent::Object::list_type& args, bool (*predicate)(const std::string&, const std::string&)) {
+  verify_argument_count(name, args, 2, 0);
+
+  auto text = rpc::convert_to_string(args.front());
+
+  for (auto itr = std::next(args.begin()); itr != args.end(); itr++)
+    if (predicate(text, rpc::convert_to_string(*itr)))
+      return int64_t(1);
+
+  return int64_t(0);
+}
+
+bool
+text_equals(const std::string& text, const std::string& other) {
+  return text == other;
+}
+
+bool
+text_starts_with(const std::string& text, const std::string& prefix) {
+  return text.size() >= prefix.size() && text.compare(0, prefix.size(), prefix) == 0;
+}
+
+bool
+text_ends_with(const std::string& text, const std::string& tail) {
+  return text.size() >= tail.size() && text.compare(text.size() - tail.size(), tail.size(), tail) == 0;
+}
+
+bool
+text_contains(const std::string& text, const std::string& needle) {
+  return text.find(needle) != std::string::npos;
+}
+
+bool
+text_contains_i(const std::string& text, const std::string& needle) {
+  return ascii_lowercase(text).find(ascii_lowercase(needle)) != std::string::npos;
+}
+
+torrent::Object
+apply_string_length(const torrent::Object::list_type& args) {
+  verify_argument_count("string.length", args, 1, 1);
+
+  return utf8_length(rpc::convert_to_string(args.front()));
+}
+
+torrent::Object
+apply_string_substr(const torrent::Object::list_type& args) {
+  verify_argument_count("string.substr", args, 1, 4);
+
+  auto text        = rpc::convert_to_string(args.front());
+  auto offsets     = utf8_offsets(text);
+  auto text_length = static_cast<int64_t>(offsets.size() - 1);
+
+  auto position = args.size() > 1 ? rpc::convert_to_value(argument_at(args, 1)) : 0;
+  auto fallback = args.size() > 3 ? rpc::convert_to_string(argument_at(args, 3)) : std::string();
+
+  // Negative positions are relative to the end of the string.
+  if (position < 0)
+    position += text_length;
+
+  if (position < 0 || position > text_length)
+    return fallback;
+
+  auto last = text_length;
+
+  if (args.size() > 2) {
+    auto count = rpc::convert_to_value(argument_at(args, 2));
+
+    if (count < 0)
+      throw torrent::input_error("string.substr: the character count cannot be negative.");
+
+    last = std::min(text_length, position + std::min(count, text_length));
+  }
+
+  return utf8_substr(text, offsets, position, last);
+}
+
+torrent::Object
+apply_string_split(const torrent::Object::list_type& args) {
+  verify_argument_count("string.split", args, 2, 2);
+
+  auto text   = rpc::convert_to_string(args.front());
+  auto delim  = rpc::convert_to_string(args.back());
+  auto result = torrent::Object::create_list();
+
+  // An empty delimiter splits the text into its utf-8 characters.
+  if (delim.empty()) {
+    auto offsets = utf8_offsets(text);
+
+    for (size_t i = 0; i + 1 < offsets.size(); i++)
+      result.as_list().push_back(utf8_substr(text, offsets, i, i + 1));
+
+    return result;
+  }
+
+  size_t first = 0;
+
+  while (true) {
+    auto pos = text.find(delim, first);
+
+    if (pos == std::string::npos) {
+      result.as_list().push_back(text.substr(first));
+      return result;
+    }
+
+    result.as_list().push_back(text.substr(first, pos - first));
+    first = pos + delim.size();
+  }
+}
+
+torrent::Object
+apply_string_join(const torrent::Object::list_type& args) {
+  verify_argument_count("string.join", args, 1, 0);
+
+  auto delim = rpc::convert_to_string(args.front());
+
+  std::vector<std::string> parts;
+
+  for (auto itr = std::next(args.begin()); itr != args.end(); itr++)
+    flatten_argument(*itr, &parts);
+
+  std::string result;
+
+  for (auto itr = parts.begin(); itr != parts.end(); itr++) {
+    if (itr != parts.begin())
+      result += delim;
+
+    result += *itr;
+  }
+
+  return result;
+}
+
+torrent::Object
+apply_string_pad(const char* name, const torrent::Object::list_type& args, bool pad_start) {
+  verify_argument_count(name, args, 2, 3);
+
+  auto text     = rpc::convert_to_string(args.front());
+  auto pad_size = rpc::convert_to_value(argument_at(args, 1));
+  auto padding  = args.size() > 2 ? rpc::convert_to_string(argument_at(args, 2)) : std::string(" ");
+
+  auto text_length = utf8_length(text);
+
+  if (pad_size <= text_length || padding.empty())
+    return text;
+
+  if (pad_size - text_length > max_string_pad_size)
+    throw torrent::input_error(std::string(name) + ": padding is too large.");
+
+  auto padding_offsets = utf8_offsets(padding);
+  auto padding_length  = static_cast<int64_t>(padding_offsets.size() - 1);
+
+  std::string result;
+  result.reserve(pad_size - text_length);
+
+  for (int64_t i = 0; i < pad_size - text_length; i++) {
+    auto index = static_cast<size_t>(i % padding_length);
+    result += utf8_substr(padding, padding_offsets, index, index + 1);
+  }
+
+  return pad_start ? result + text : text + result;
+}
+
+torrent::Object
+apply_string_strip(const char* name, const torrent::Object::list_type& args, bool strip_start, bool strip_end) {
+  verify_argument_count(name, args, 1, 0);
+
+  auto text = rpc::convert_to_string(args.front());
+
+  std::string strippable;
+
+  for (auto itr = std::next(args.begin()); itr != args.end(); itr++)
+    strippable += rpc::convert_to_string(*itr);
+
+  if (args.size() == 1)
+    strippable = whitespace_characters;
+
+  auto characters = utf8_character_set(strippable);
+  auto offsets    = utf8_offsets(text);
+
+  size_t first = 0;
+  size_t last  = offsets.size() - 1;
+
+  while (strip_start && first < last && characters.count(utf8_substr(text, offsets, first, first + 1)) != 0)
+    first++;
+
+  while (strip_end && last > first && characters.count(utf8_substr(text, offsets, last - 1, last)) != 0)
+    last--;
+
+  return utf8_substr(text, offsets, first, last);
+}
+
+torrent::Object
+apply_string_map(const torrent::Object::list_type& args) {
+  verify_argument_count("string.map", args, 2, 0);
+
+  auto text = rpc::convert_to_string(args.front());
+
+  for (auto itr = std::next(args.begin()); itr != args.end(); itr++) {
+    auto pair = argument_to_pair("string.map", *itr);
+
+    if (text == pair.first)
+      return pair.second;
+  }
+
+  return text;
+}
+
+torrent::Object
+apply_string_replace(const torrent::Object::list_type& args) {
+  verify_argument_count("string.replace", args, 2, 0);
+
+  auto text = rpc::convert_to_string(args.front());
+
+  for (auto itr = std::next(args.begin()); itr != args.end(); itr++) {
+    auto pair = argument_to_pair("string.replace", *itr);
+
+    if (pair.first.empty())
+      throw torrent::input_error("string.replace: the replaced text cannot be empty.");
+
+    for (auto pos = text.find(pair.first); pos != std::string::npos; pos = text.find(pair.first, pos + pair.second.size()))
+      text.replace(pos, pair.first.size(), pair.second);
+  }
+
+  return text;
+}
+
+}
+
+void
+initialize_command_string() {
+  // clang-format off
+  CMD2_ANY_LIST("string.length",        [](auto, const auto& args) { return apply_string_length(args); });
+  CMD2_ANY_LIST("string.substr",     [](auto, const auto& args) { return apply_string_substr(args); });
+  CMD2_ANY_LIST("string.split",      [](auto, const auto& args) { return apply_string_split(args); });
+  CMD2_ANY_LIST("string.join",       [](auto, const auto& args) { return apply_string_join(args); });
+  CMD2_ANY_LIST("string.map",        [](auto, const auto& args) { return apply_string_map(args); });
+  CMD2_ANY_LIST("string.replace",    [](auto, const auto& args) { return apply_string_replace(args); });
+
+  CMD2_ANY_LIST("string.equals",     [](auto, const auto& args) { return apply_string_predicate("string.equals", args, &text_equals); });
+  CMD2_ANY_LIST("string.starts_with", [](auto, const auto& args) { return apply_string_predicate("string.starts_with", args, &text_starts_with); });
+  CMD2_ANY_LIST("string.ends_with",   [](auto, const auto& args) { return apply_string_predicate("string.ends_with", args, &text_ends_with); });
+  CMD2_ANY_LIST("string.contains",   [](auto, const auto& args) { return apply_string_predicate("string.contains", args, &text_contains); });
+  CMD2_ANY_LIST("string.contains_i", [](auto, const auto& args) { return apply_string_predicate("string.contains_i", args, &text_contains_i); });
+
+  CMD2_ANY_LIST("string.lpad",       [](auto, const auto& args) { return apply_string_pad("string.lpad", args, true); });
+  CMD2_ANY_LIST("string.rpad",       [](auto, const auto& args) { return apply_string_pad("string.rpad", args, false); });
+
+  CMD2_ANY_LIST("string.strip",      [](auto, const auto& args) { return apply_string_strip("string.strip", args, true, true); });
+  CMD2_ANY_LIST("string.lstrip",     [](auto, const auto& args) { return apply_string_strip("string.lstrip", args, true, false); });
+  CMD2_ANY_LIST("string.rstrip",     [](auto, const auto& args) { return apply_string_strip("string.rstrip", args, false, true); });
+  // clang-format on
+
+  for (const auto name : {"string.length", "string.substr", "string.split", "string.join", "string.map", "string.replace",
+                          "string.equals", "string.starts_with", "string.ends_with", "string.contains", "string.contains_i",
+                          "string.lpad", "string.rpad", "string.strip", "string.lstrip", "string.rstrip"})
+    rpc::rpc.mark_safe(name);
+}

src/command_system.cc

@@ -0,0 +1,195 @@
+#include "config.h"
+
+#include <unistd.h>
+#include <sys/stat.h>
+#include <torrent/data/file_manager.h>
+#include <torrent/runtime/client_config.h>
+#include <torrent/runtime/memory_manager.h>
+#include <torrent/runtime/socket_manager.h>
+#include <torrent/runtime/runtime.h>
+#include <torrent/utils/chrono.h>
+#include <torrent/utils/option_strings.h>
+
+#include "command_helpers.h"
+#include "control.h"
+#include "globals.h"
+#include "core/manager.h"
+#include "session/session_manager.h"
+#include "utils/file_status_cache.h"
+
+
+torrent::Object
+system_env(const torrent::Object::string_type& arg) {
+  if (arg.empty())
+    throw torrent::input_error("system.env: Missing variable name.");
+
+  char* val = getenv(arg.c_str());
+  return std::string(val ? val : "");
+}
+
+torrent::Object
+system_hostname() {
+  char buffer[1024];
+
+  if (gethostname(buffer, 1023) == -1)
+    throw torrent::input_error("Unable to read hostname.");
+
+//   if (shorten)
+//     *std::find(buffer, buffer + 1023, '.') = '\0';
+
+  return std::string(buffer);
+}
+
+torrent::Object
+system_get_cwd() {
+  char* buffer = getcwd(NULL, 0);
+
+  if (buffer == NULL)
+    throw torrent::input_error("Unable to read cwd.");
+
+  torrent::Object result = torrent::Object(std::string(buffer));
+  free(buffer);
+
+  return result;
+}
+
+torrent::Object
+system_set_cwd(const torrent::Object::string_type& rawArgs) {
+  if (::chdir(rawArgs.c_str()) != 0)
+    throw torrent::input_error("Could not change current working directory.");
+
+  return torrent::Object();
+}
+
+uint32_t
+checked_socket_value(int64_t value, const char* label) {
+  if (value < 0 || value > std::numeric_limits<uint32_t>::max())
+    throw torrent::input_error(std::string("Invalid ") + label + " value.");
+
+  return static_cast<uint32_t>(value);
+}
+
+void
+initialize_command_system() {
+  CMD_ANY         ("system.hostname", std::bind(&system_hostname));
+  CMD_ANY         ("system.pid",      std::bind(&getpid));
+
+  CMD_VAR_C_STRING("system.api_version",           (int64_t)API_VERSION);
+  CMD_VAR_C_STRING("system.client_version",        PACKAGE_VERSION);
+  CMD_VAR_C_STRING("system.library_version",       torrent::runtime::version());
+
+  CMD_ANY         ("system.torrent_name.use_sanitized",     [](auto, auto)        { return torrent::runtime::client_config()->torrent_name_use_sanitized(); });
+  CMD_ANY_VALUE_V ("system.torrent_name.use_sanitized.set", [](auto, auto& value) { return torrent::runtime::client_config()->set_torrent_name_use_sanitized(value); });
+
+  CMD_VAR_VALUE   ("system.file.allocate",         0);
+  CMD_VAR_VALUE   ("system.file.max_size",         (int64_t)512 << 30);
+  CMD_VAR_VALUE   ("system.file.split_size",       -1);
+  CMD_VAR_STRING  ("system.file.split_suffix",     ".part");
+
+  CMD_ANY         ("system.file_name.replace_slash",     [](auto, auto)      { return torrent::runtime::client_config()->file_name_replace_slash(); });
+  CMD_ANY_STRING_V("system.file_name.replace_slash.set", [](auto, auto& str) { return torrent::runtime::client_config()->set_file_name_replace_slash(str); });
+
+  CMD_ANY         ("system.file_status_cache.size",      [](auto, auto)      { return control->core()->file_status_cache()->size(); });
+  CMD_ANY_V       ("system.file_status_cache.prune",     [](auto, auto)      { return control->core()->file_status_cache()->prune(); });
+
+  CMD_VAR_BOOL    ("file.prioritize_toc",          0);
+  CMD_VAR_LIST    ("file.prioritize_toc.first");
+  CMD_VAR_LIST    ("file.prioritize_toc.last");
+
+  CMD_ANY         ("system.files.advise_random",             [](auto, auto)        { return torrent::file_manager()->advise_random(); });
+  CMD_ANY_VALUE_V ("system.files.advise_random.set",         [](auto, auto& value) { return torrent::file_manager()->set_advise_random(value); });
+  CMD_ANY         ("system.files.advise_random.hashing",     [](auto, auto)        { return torrent::file_manager()->advise_random_hashing(); });
+  CMD_ANY_VALUE_V ("system.files.advise_random.hashing.set", [](auto, auto& value) { return torrent::file_manager()->set_advise_random_hashing(value); });
+  CMD_ANY         ("system.files.session.fdatasync",         [](auto, auto)        { return session_thread::manager()->use_fsyncdisk(); });
+  CMD_ANY_VALUE_V ("system.files.session.fdatasync.set",     [](auto, auto& value) { return session_thread::manager()->set_use_fsyncdisk(value); });
+
+  CMD_ANY         ("system.files.close_idle",         [](auto, auto)        { return torrent::file_manager()->close_idle_timeout().count(); });
+  CMD_ANY_VALUE_V ("system.files.close_idle.set",     [](auto, auto& value) { return torrent::file_manager()->set_close_idle_timeout(value * 1s); });
+
+  CMD_ANY         ("system.files.opened_counter",     [](auto, auto)        { return torrent::file_manager()->files_opened_counter(); });
+  CMD_ANY         ("system.files.closed_counter",     [](auto, auto)        { return torrent::file_manager()->files_closed_counter(); });
+  CMD_ANY         ("system.files.failed_counter",     [](auto, auto)        { return torrent::file_manager()->files_failed_counter(); });
+
+  CMD_ANY_STRING  ("system.env",                      [](auto, auto& str)   { return system_env(str); });
+
+  CMD_ANY         ("system.time",                     [](auto, auto)        { return torrent::this_thread::cached_seconds().count(); });
+  CMD_ANY         ("system.time_seconds",             [](auto, auto)        { return torrent::utils::cast_seconds(torrent::utils::time_since_epoch()).count(); });
+  CMD_ANY         ("system.time_usec",                [](auto, auto)        { return torrent::utils::time_since_epoch().count(); });
+
+  CMD_ANY_VALUE_V ("system.umask.set",                [](auto, auto& value) { return ::umask(value); });
+
+  CMD_VAR_BOOL    ("system.daemon",                   false);
+
+  CMD_ANY_V       ("system.shutdown.normal",          [](auto, auto)        { control->receive_normal_shutdown(); });
+  CMD_ANY_V       ("system.shutdown.quick",           [](auto, auto)        { control->receive_quick_shutdown(); });
+
+  CMD_REDIRECT_NO_EXPORT("system.shutdown", "system.shutdown.normal");
+
+  CMD_ANY         ("system.cwd",                      [](auto, auto)        { return system_get_cwd(); });
+  CMD_ANY_STRING  ("system.cwd.set",                  [](auto, auto& str)   { return system_set_cwd(str); });
+
+  CMD_ANY         ("system.sockets.size",             [](auto, auto)        { return torrent::runtime::socket_manager()->size(); });
+  CMD_ANY         ("system.sockets.max_size",         [](auto, auto)        { return torrent::runtime::socket_manager()->max_size(); });
+  CMD_ANY_VALUE_V ("system.sockets.max_size.set",     [](auto, auto& value) {
+      return torrent::runtime::socket_manager()->set_max_size_and_adjust(checked_socket_value(value, "socket max size"));
+    });
+  CMD_ANY_V       ("system.sockets.adjust_alloc",     [](auto, auto)        { torrent::runtime::socket_manager()->adjust_allocation(); });
+  CMD_ANY         ("system.sockets.reserved_alloc",   [](auto, auto)        { return torrent::runtime::socket_manager()->reserved_allocation(); });
+  CMD_ANY         ("system.sockets.available_alloc",  [](auto, auto)        { return torrent::runtime::socket_manager()->available_allocation(); });
+
+  for (uint32_t i = 0; i < torrent::runtime::SocketManager::category_count; ++i) {
+    auto category      = static_cast<torrent::runtime::socket_manager_category_t>(i);
+    auto category_name = "system.sockets." + torrent::option_to_str_or_throw(torrent::OPTION_SOCKET_CATEGORY, i);
+
+    CMD_ANY        (category_name + ".size",      [category](auto, auto) { return torrent::runtime::socket_manager()->category_managed_size(category); });
+    CMD_ANY        (category_name + ".max_size",  [category](auto, auto) { return torrent::runtime::socket_manager()->category_max_size(category); });
+
+    if (i == 0) {
+      CMD_ANY      (category_name + ".min_alloc", [](auto, auto) { return torrent::runtime::socket_manager()->generic_min_allocation(); });
+      continue;
+    }
+
+    CMD_ANY        (category_name + ".max_alloc.limit", [category](auto, auto)        { return torrent::runtime::socket_manager()->category_alloc_limit(category); });
+    CMD_ANY        (category_name + ".min_alloc.limit", [category](auto, auto)        { return torrent::runtime::socket_manager()->category_alloc_minimum(category); });
+    CMD_ANY        (category_name + ".min_alloc",       [category](auto, auto)        { return torrent::runtime::socket_manager()->category_min_allocation(category); });
+    CMD_ANY        (category_name + ".max_alloc",       [category](auto, auto)        { return torrent::runtime::socket_manager()->category_max_allocation(category); });
+    CMD_ANY_VALUE_V(category_name + ".min_alloc.set",   [category](auto, auto& value) {
+        torrent::runtime::socket_manager()->set_category_min_allocation(category, checked_socket_value(value, "socket min alloc"));
+      });
+    CMD_ANY_VALUE_V(category_name + ".max_alloc.set",   [category](auto, auto& value) {
+        torrent::runtime::socket_manager()->set_category_max_allocation(category, checked_socket_value(value, "socket max alloc"));
+      });
+  }
+
+  rpc::rpc.mark_safe("system.api_version");
+  rpc::rpc.mark_safe("system.client_version");
+  rpc::rpc.mark_safe("system.library_version");
+  rpc::rpc.mark_safe("system.time");
+  rpc::rpc.mark_safe("system.time_seconds");
+  rpc::rpc.mark_safe("system.time_usec");
+  rpc::rpc.mark_safe("system.file.max_size");
+  rpc::rpc.mark_safe("system.file.split_size");
+  rpc::rpc.mark_safe("system.file.split_suffix");
+
+  rpc::rpc.mark_safe("system.sockets.size");
+  rpc::rpc.mark_safe("system.sockets.max_size");
+  rpc::rpc.mark_safe("system.sockets.reserved_alloc");
+  rpc::rpc.mark_safe("system.sockets.available_alloc");
+
+  for (uint32_t i = 0; i < torrent::runtime::SocketManager::category_count; ++i) {
+    auto category_name = "system.sockets." + torrent::option_to_str_or_throw(torrent::OPTION_SOCKET_CATEGORY, i);
+
+    rpc::rpc.mark_safe(category_name + ".size");
+    rpc::rpc.mark_safe(category_name + ".max_size");
+
+    if (i == 0) {
+      rpc::rpc.mark_safe(category_name + ".min_alloc");
+      continue;
+    }
+
+    rpc::rpc.mark_safe(category_name + ".max_alloc.limit");
+    rpc::rpc.mark_safe(category_name + ".min_alloc.limit");
+    rpc::rpc.mark_safe(category_name + ".min_alloc");
+    rpc::rpc.mark_safe(category_name + ".max_alloc");
+  }
+}

src/command_throttle.cc

@@ -1,10 +1,9 @@
 #include "config.h"
 
-#include <cstdio>
+#include <limits>
 #include <torrent/throttle.h>
 #include <torrent/rate.h>
 #include <torrent/download/resource_manager.h>
-#include <torrent/net/socket_address.h>
 
 #include "core/manager.h"
 #include "ui/root.h"
@@ -15,59 +14,6 @@
 #include "control.h"
 #include "command_helpers.h"
 
-std::pair<uint32_t, uint32_t>
-parse_address_range(const torrent::Object::list_type& args, torrent::Object::list_type::const_iterator itr) {
-  unsigned int prefixWidth, ret;
-  char dummy;
-  char host[1024];
-  torrent::sa_unique_ptr sa;
-
-  ret = std::sscanf(itr->as_string().c_str(), "%1023[^/]/%d%c", host, &prefixWidth, &dummy);
-
-  if (ret < 1)
-    throw torrent::input_error("Invalid address/prefix.");
-
-  try {
-    sa = torrent::sa_copy(torrent::sa_lookup_address(host, AF_INET).get());
-
-  } catch (torrent::input_error& e) {
-    throw torrent::input_error("Could not resolve host: " + std::string(e.what()));
-  }
-
-  uint32_t begin, end;
-
-  auto sa_addr = htonl(reinterpret_cast<sockaddr_in*>(sa.get())->sin_addr.s_addr);
-
-  begin = end = sa_addr;
-
-  if (ret == 2) {
-    if (++itr != args.end())
-      throw torrent::input_error("Cannot specify both network and range end.");
-
-    uint32_t netmask = std::numeric_limits<uint32_t>::max() << (32 - prefixWidth);
-
-    if (prefixWidth >= 32 || sa_addr & ~netmask)
-      throw torrent::input_error("Invalid address/prefix.");
-
-    end = sa_addr | ~netmask;
-
-  } else if (++itr != args.end()) {
-    try {
-      sa = torrent::sa_copy(torrent::sa_lookup_address(itr->as_string(), AF_INET).get());
-
-    } catch (torrent::input_error& e) {
-      throw torrent::input_error("Could not resolve host: " + std::string(e.what()));
-    }
-
-    sa_addr = htonl(reinterpret_cast<sockaddr_in*>(sa.get())->sin_addr.s_addr);
-    end = sa_addr;
-  }
-
-  // convert to [begin, end) making sure the end doesn't overflow
-  // (this precludes 255.255.255.255 from ever matching, but that's not a real IP anyway)
-  return std::make_pair((uint32_t)begin, (uint32_t)std::max(end, end + 1));
-}
-
 torrent::Object
 apply_throttle(const torrent::Object::list_type& args, bool up) {
   auto arg_itr = args.begin();
@@ -83,11 +29,16 @@ apply_throttle(const torrent::Object::list_type& args, bool up) {
     throw torrent::input_error("Missing throttle rate for '" + name + "'.");
 
   int64_t rate;
-  rpc::parse_whole_value_nothrow(arg_itr->as_string().c_str(), &rate);
+
+  if (!rpc::parse_whole_value_nothrow(arg_itr->as_string().c_str(), &rate))
+    throw torrent::input_error("Invalid throttle rate for '" + name + "'.");
 
   if (rate < 0)
     throw torrent::input_error("Throttle rate must be non-negative.");
 
+  if (rate > (std::numeric_limits<int64_t>::max() >> 10))
+    throw torrent::input_error("Throttle rate is too large.");
+
   auto itr = control->core()->throttles().find(name);
 
   if (itr == control->core()->throttles().end())

src/command_tracker.cc

@@ -68,11 +68,11 @@ apply_dht_add_node(const std::string& arg) {
 torrent::Object
 apply_enable_trackers(int64_t arg) {
   if (arg == 0) {
-    for (auto download : *control->core()->download_list())
+    for (const auto& download : *control->core()->download_list())
       download->tracker_controller().for_each([](auto& tracker) { tracker.disable(); });
 
   } else {
-    for (auto download : *control->core()->download_list())
+    for (const auto& download : *control->core()->download_list())
       download->tracker_controller().for_each([](auto& tracker) { tracker.enable(); });
   }
 

src/command_ui.cc

@@ -2,7 +2,9 @@
 
 #include <sys/types.h>
 
+#include <cerrno>
 #include <ctime>
+#include <limits>
 #include <regex>
 #include <torrent/utils/log.h>
 
@@ -125,11 +127,20 @@ apply_value([[maybe_unused]] rpc::target_type target, const torrent::Object::lis
   if (args.front().is_value()) {
     val = args.front().as_value();
   } else {
-    int base = args.size() > 1 ? args.back().is_value() ?
+    int64_t base = args.size() > 1 ? args.back().is_value() ?
-               args.back().as_value() : strtol(args.back().as_string().c_str(), NULL, 10) : 10;
+                   args.back().as_value() : strtoll(args.back().as_string().c_str(), NULL, 10) : 10;
+
+    if (base != 0 && (base < 2 || base > 36))
+      throw torrent::input_error("'value' base must be 0 or between 2 and 36!");
+
     char* endptr = 0;
+    errno = 0;
 
     val = strtoll(args.front().as_string().c_str(), &endptr, base);
+
+    if (errno == ERANGE)
+      throw torrent::input_error("Number out of range: " + args.front().as_string());
+
     while (*endptr == ' ' || *endptr == '\n') ++endptr;
     if (*endptr)
       throw torrent::input_error("Junk at end of number: " + args.front().as_string());
@@ -407,8 +418,9 @@ apply_to_time(const torrent::Object& rawArgs, int flags) {
 torrent::Object
 apply_to_elapsed_time(const torrent::Object& rawArgs) {
   auto cached_seconds = torrent::this_thread::cached_seconds().count();
+  auto value          = rawArgs.as_value();
 
-  uint64_t arg = cached_seconds - rawArgs.as_value();
+  uint64_t arg = value >= 0 && value <= cached_seconds ? cached_seconds - value : 0;
 
   char buffer[48];
   snprintf(buffer, 48, "%2d:%02d:%02d", (int)(arg / 3600), (int)((arg / 60) % 60), (int)(arg % 60));
@@ -674,8 +686,13 @@ apply_math_basic(const char* name, Comp op, const torrent::Object::list_type& ar
       throw torrent::input_error(std::string(name) + ": Wrong argument type");
     }
 
-    if (divides && !rhs && itr != args.begin())
+    if (divides && itr != args.begin()) {
-      throw torrent::input_error(std::string(name) + ": Division by zero!");
+      if (rhs == 0)
+        throw torrent::input_error(std::string(name) + ": Division by zero!");
+
+      if (val == std::numeric_limits<int64_t>::min() && rhs == -1)
+        throw torrent::input_error(std::string(name) + ": Division overflow!");
+    }
 
     val = itr == args.begin() ? rhs : op(val, rhs);
 
@@ -916,6 +933,7 @@ initialize_command_ui() {
 
   rpc::rpc.mark_safe("view.set_visible");
   rpc::rpc.mark_safe("view.set_not_visible");
+  rpc::rpc.mark_safe("view.list");
 
   rpc::rpc.mark_safe("cat");
   rpc::rpc.mark_safe("if");

src/control.h

@@ -118,4 +118,6 @@ private:
   std::atomic<bool>   m_shutdown_quick{};
 };
 
+extern Control* control;
+
 #endif

src/core/dht_manager.cc

@@ -4,6 +4,7 @@
 
 #include <fstream>
 #include <sstream>
+#include <torrent/exceptions.h>
 #include <torrent/object.h>
 #include <torrent/object_stream.h>
 #include <torrent/rate.h>
@@ -62,7 +63,14 @@ DhtManager::load_dht_cache() {
     LT_LOG("could not open cache file (path:%s)", cache_filename.c_str());
   }
 
-  torrent::runtime::network_manager()->dht_controller()->initialize(cache);
+  try {
+    torrent::runtime::network_manager()->dht_controller()->initialize(cache);
+
+  } catch (const torrent::base_error& e) {
+    LT_LOG_ERROR("cache file rejected, discarding (path:%s errmsg:%s)", cache_filename.c_str(), e.what());
+
+    torrent::runtime::network_manager()->dht_controller()->initialize(torrent::Object::create_map());
+  }
 
   if (m_start == dht_on)
     start_dht();
@@ -132,11 +140,12 @@ DhtManager::save_dht_cache() {
   torrent::Object cache = torrent::Object::create_map();
   cache_file << *torrent::runtime::network_manager()->dht_controller()->store_cache(&cache);
 
+  // The data only reaches the kernel here, so this is where a full disk is seen.
+  cache_file.close();
+
   if (!cache_file.good())
     return;
 
-  cache_file.close();
-
   ::rename(filename_tmp.c_str(), filename.c_str());
 }
 

src/core/download.cc

@@ -101,7 +101,18 @@ Download::set_throttle_name(const std::string& name) {
 }
 
 void
-Download::set_root_directory(const std::string& path) {
+Download::set_directory(const std::string& path) {
+  if (!m_download.file_list()->is_multi_file())
+    return set_base_directory(path);
+
+  if (path.empty() || *path.rbegin() == '/')
+    return set_base_directory(path + m_download.info()->name_sanitized());
+
+  set_base_directory(path + "/" + m_download.info()->name_sanitized());
+}
+
+void
+Download::set_base_directory(const std::string& path) {
   // If the download is open, hashed and has completed chunks make
   // sure to verify that the download files are still present.
   //
@@ -120,13 +131,12 @@ Download::set_root_directory(const std::string& path) {
        !file_stat.update(file_list->front()->frozen_path().str()))) {
 
     set_message("Cannot change the directory of an open download after the files have been moved.");
-    rpc::call_command("d.state.set", (int64_t)0, rpc::make_target(this));
     control->core()->download_list()->close_directly(this);
 
     throw torrent::input_error("Cannot change the directory of an open download after the files have been moved.");
   }
 
-  control->core()->download_list()->close_directly(this);
+  control->core()->download_list()->close_files(this);
   file_list->set_root_dir(expand_path(path));
 
   bencode()->get_key("rtorrent").insert_key("directory", path);

src/core/download.h

@@ -1,6 +1,7 @@
 #ifndef RTORRENT_CORE_DOWNLOAD_H
 #define RTORRENT_CORE_DOWNLOAD_H
 
+#include <memory>
 #include <torrent/common.h>
 #include <torrent/download.h>
 #include <torrent/download_info.h>
@@ -78,7 +79,8 @@ public:
   uint32_t            resume_flags()                           { return m_resumeFlags; }
   void                set_resume_flags(uint32_t flags)         { m_resumeFlags = flags; }
 
-  void                set_root_directory(const std::string& path);
+  void                set_directory(const std::string& path);
+  void                set_base_directory(const std::string& path);
 
   void                set_throttle_name(const std::string& name);
 

src/core/download_factory.cc

@@ -7,6 +7,7 @@
 #include <functional>
 #include <sstream>
 #include <stdexcept>
+#include <sys/stat.h>
 #include <torrent/utils/log.h>
 #include <torrent/utils/resume.h>
 #include <torrent/object.h>
@@ -35,8 +36,15 @@ is_network_uri(const std::string& uri) {
     std::strncmp(uri.c_str(), "ftp://", 6) == 0;
 }
 
+static constexpr const char* session_invalid_message = "Session data is invalid, ignoring it";
+
 static std::unique_ptr<torrent::Object>
-download_factory_load_stream(const char* filename) {
+download_factory_load_stream(const char* filename, bool* is_invalid) {
+  struct stat sb;
+
+  if (stat(filename, &sb) != 0 || !S_ISREG(sb.st_mode))
+    return std::unique_ptr<torrent::Object>();
+
   std::fstream stream(filename, std::ios::in | std::ios::binary);
 
   if (!stream.is_open())
@@ -45,8 +53,10 @@ download_factory_load_stream(const char* filename) {
   auto obj = std::make_unique<torrent::Object>();
   stream >> *obj;
 
-  if (!stream.good())
+  if (!stream.good() || !obj->is_map()) {
+    *is_invalid = true;
     return std::unique_ptr<torrent::Object>();
+  }
 
   return obj;
 }
@@ -161,8 +171,21 @@ DownloadFactory::receive_commit() {
 
 void
 DownloadFactory::receive_success() {
-  auto rtorrent_object          = download_factory_load_stream((expand_path(m_uri) + ".rtorrent").c_str());
+  bool session_invalid = false;
-  auto libtorrent_resume_object = download_factory_load_stream((expand_path(m_uri) + ".libtorrent_resume").c_str());
+
+  std::unique_ptr<torrent::Object> rtorrent_object;
+  std::unique_ptr<torrent::Object> libtorrent_resume_object;
+
+  if (m_session) {
+    if (m_uri.empty())
+      throw torrent::input_error("Session torrent URI is empty.");
+
+    rtorrent_object          = download_factory_load_stream((expand_path(m_uri) + ".rtorrent").c_str(), &session_invalid);
+    libtorrent_resume_object = download_factory_load_stream((expand_path(m_uri) + ".libtorrent_resume").c_str(), &session_invalid);
+
+    if (session_invalid)
+      lt_log_print(torrent::LOG_ERROR, "%s: %s", session_invalid_message, m_uri.c_str());
+  }
 
   uint32_t tracker_key;
 
@@ -184,6 +207,14 @@ DownloadFactory::receive_success() {
     return;
   }
 
+  if (session_invalid) {
+    download->set_hash_failed(true);
+    download->set_message(session_invalid_message);
+
+    if (m_printLog)
+      m_manager->push_log_std(std::string(session_invalid_message) + ": \"" + m_uri + "\"");
+  }
+
   torrent::Object* root = download->bencode();
 
   if (download->download()->info()->is_meta_download()) {
@@ -274,9 +305,22 @@ DownloadFactory::receive_success() {
 
   rpc::call_command("d.peer_exchange.set", torrent::runtime::client_config()->is_pex_enabled(), rpc::make_target(download));
 
-  torrent::resume_load_addresses(*download->download(), resumeObject);
+  try {
-  torrent::resume_load_file_priorities(*download->download(), resumeObject);
+    torrent::resume_load_addresses(*download->download(), resumeObject);
-  torrent::resume_load_tracker_settings(*download->download(), resumeObject);
+    torrent::resume_load_file_priorities(*download->download(), resumeObject);
+    torrent::resume_load_tracker_settings(*download->download(), resumeObject);
+
+  } catch (const torrent::input_error& e) {
+    std::string msg = std::string(session_invalid_message) + ": " + e.what();
+
+    lt_log_print(torrent::LOG_ERROR, "%s: %s", msg.c_str(), m_uri.c_str());
+
+    if (m_printLog)
+      m_manager->push_log_std(msg + ": \"" + m_uri + "\"");
+
+    download->set_hash_failed(true);
+    download->set_message(msg);
+  }
 
   // The action of inserting might cause the torrent to be
   // opened/started or such. Figure out a nicer way of handling this.

src/core/download_list.cc

@@ -37,7 +37,7 @@ namespace core {
 inline void
 DownloadList::check_contains([[maybe_unused]] Download* d) {
 #ifdef USE_EXTRA_DEBUG
-  if (std::find(begin(), end(), d) == end())
+  if (std::find_if(begin(), end(), [d](const auto& entry) { return entry.get() == d; }) == end())
     throw torrent::internal_error("DownloadList::check_contains(...) failed.");
 #endif
 }
@@ -54,7 +54,6 @@ DownloadList::clear() {
       base_type::pop_back();
 
       torrent::download_remove(*download->download());
-      delete download;
 
     } catch (torrent::internal_error& e) {
       lt_log_print(torrent::LOG_ERROR, "DownloadList::clear() failed to close or remove download: %s", e.what());
@@ -70,7 +69,7 @@ DownloadList::clear() {
 void
 DownloadList::session_save() {
   for (auto& download : *this)
-    session_thread::manager()->save_resume_download(download);
+    session_thread::manager()->save_resume_download(download.get());
 
   control->dht_manager()->save_dht_cache();
   control->ui()->save_input_history();
@@ -78,7 +77,7 @@ DownloadList::session_save() {
 
 DownloadList::iterator
 DownloadList::find(const torrent::HashString& hash) {
-  return std::find_if(begin(), end(), [hash](Download* d) { return hash == d->info()->hash(); });
+  return std::find_if(begin(), end(), [hash](const auto& d) { return hash == d->info()->hash(); });
 }
 
 DownloadList::iterator
@@ -91,14 +90,14 @@ DownloadList::find_hex(const char* hash) {
   if (torrent::utils::transform_from_hex(hash, hash + 40, key) != key.end())
     return end();
 
-  return std::find_if(begin(), end(), [key](Download* d) { return key == d->info()->hash(); });
+  return std::find_if(begin(), end(), [key](const auto& d) { return key == d->info()->hash(); });
 }
 
 Download*
 DownloadList::find_hex_ptr(const char* hash) {
   iterator itr = find_hex(hash);
 
-  return itr != end() ? *itr : NULL;
+  return itr != end() ? itr->get() : NULL;
 }
 
 Download*
@@ -159,7 +158,7 @@ DownloadList::create(std::istream* str, uint32_t tracker_key, bool printLog) {
 
 DownloadList::iterator
 DownloadList::insert(Download* download) {
-  iterator itr = base_type::insert(end(), download);
+  iterator itr = base_type::insert(end(), std::shared_ptr<Download>(download));
 
   lt_log_print_info(torrent::LOG_TORRENT_INFO, download->info(), "download_list", "Inserting download.");
 
@@ -170,7 +169,7 @@ DownloadList::insert(Download* download) {
     // This needs to be separated into two different calls to ensure
     // the download remains in the view.
     for (auto v : *control->view_manager())
-      v->insert(download);
+      v->insert(*itr);
     for (auto v : *control->view_manager())
       v->filter_download(download);
 
@@ -187,7 +186,7 @@ DownloadList::insert(Download* download) {
 
 void
 DownloadList::erase_ptr(Download* download) {
-  erase(std::find(begin(), end(), download));
+  erase(std::find_if(begin(), end(), [download](const auto& entry) { return entry.get() == download; }));
 }
 
 DownloadList::iterator
@@ -201,15 +200,14 @@ DownloadList::erase(iterator itr) {
   (*itr)->set_hash_failed(true);
 
   close(*itr);
-  session_thread::manager()->remove_download(*itr);
+  session_thread::manager()->remove_download(itr->get());
 
   DL_TRIGGER_EVENT(*itr, "event.download.erased");
 
   for (auto v : *control->view_manager())
-    v->erase(*itr);
+    v->erase(itr->get());
 
   torrent::download_remove(*(*itr)->download());
-  delete *itr;
 
   return base_type::erase(itr);
 }
@@ -256,9 +254,11 @@ DownloadList::close(Download* download) {
   }
 }
 
+// Releases the files without changing the download's state, for callers that
+// need the files closed and will keep using the download.
 void
-DownloadList::close_directly(Download* download) {
+DownloadList::close_files(Download* download) {
-  lt_log_print_info(torrent::LOG_TORRENT_INFO, download->info(), "download_list", "Closing download directly.");
+  lt_log_print_info(torrent::LOG_TORRENT_INFO, download->info(), "download_list", "Closing download files.");
 
   if (download->download()->info()->is_active()) {
     download->download()->stop(torrent::Download::stop_skip_tracker);
@@ -271,6 +271,44 @@ DownloadList::close_directly(Download* download) {
     download->download()->close();
 }
 
+void
+DownloadList::close_directly(Download* download) {
+  lt_log_print_info(torrent::LOG_TORRENT_INFO, download->info(), "download_list", "Closing download directly.");
+
+  bool was_active = download->download()->info()->is_active();
+  bool was_open   = download->download()->info()->is_open();
+
+  close_files(download);
+  set_state_stopped(download);
+
+  if (was_active) {
+    DL_TRIGGER_EVENT(download, "event.download.paused");
+    update_paused_state(download);
+  }
+
+  if (was_open) {
+    DL_TRIGGER_EVENT(download, "event.download.hash_removed");
+    DL_TRIGGER_EVENT(download, "event.download.closed");
+  }
+}
+
+void
+DownloadList::set_state_stopped(Download* download) {
+  control->view_manager()->find_ptr_throw("stopped")->set_visible(download);
+  rpc::call_command("d.state.set", (int64_t)0, rpc::make_target(download));
+}
+
+void
+DownloadList::update_paused_state(Download* download) {
+  rpc::call_command("d.state_changed.set", torrent::this_thread::cached_seconds().count(), rpc::make_target(download));
+  rpc::call_command("d.state_counter.set", rpc::call_command_value("d.state_counter", rpc::make_target(download)) + 1, rpc::make_target(download));
+
+  // If initial seeding is complete, don't try it again when restarting.
+  if (download->is_done() &&
+      rpc::call_command("d.connection_current", torrent::Object(), rpc::make_target(download)).as_string() == "initial_seed")
+    rpc::call_command("d.connection_seed.set", rpc::call_command("d.connection_current", torrent::Object(), rpc::make_target(download)), rpc::make_target(download));
+}
+
 void
 DownloadList::close_quick(Download* download) {
   lt_log_print_info(torrent::LOG_TORRENT_INFO, download->info(), "download_list", "Closing download quickly.");
@@ -445,15 +483,7 @@ DownloadList::pause(Download* download, int flags) {
     // view.
     DL_TRIGGER_EVENT(download, "event.download.paused");
 
-    auto cached_seconds = torrent::this_thread::cached_seconds().count();
+    update_paused_state(download);
-
-    rpc::call_command("d.state_changed.set", cached_seconds, rpc::make_target(download));
-    rpc::call_command("d.state_counter.set", rpc::call_command_value("d.state_counter", rpc::make_target(download)), rpc::make_target(download));
-
-    // If initial seeding is complete, don't try it again when restarting.
-    if (download->is_done() &&
-        rpc::call_command("d.connection_current", torrent::Object(), rpc::make_target(download)).as_string() == "initial_seed")
-      rpc::call_command("d.connection_seed.set", rpc::call_command("d.connection_current", torrent::Object(), rpc::make_target(download)), rpc::make_target(download));
 
     // Save the state after all the slots, etc have been called so we
     // include the modifications they may make.
@@ -524,7 +554,7 @@ DownloadList::hash_done(Download* download) {
     // If the download was previously completed but the files were
     // f.ex deleted, then we clear the state and complete.
     if (rpc::call_command_value("d.complete", rpc::make_target(download)) && !download->is_done()) {
-      rpc::call_command("d.state.set", (int64_t)0, rpc::make_target(download));
+      set_state_stopped(download);
       download->set_message("Download registered as completed, but hash check returned unfinished chunks.");
     }
 
@@ -696,11 +726,10 @@ DownloadList::process_meta_download(Download* download) {
     return;
   }
 
-  torrent::Object* bencode = new torrent::Object(torrent::Object::create_map());
+  auto bencode = std::make_unique<torrent::Object>(torrent::Object::create_map());
   file >> bencode->insert_key("info", torrent::Object());
 
   if (file.fail()) {
-    delete bencode;
     lt_log_print(torrent::LOG_TORRENT_ERROR, "Could not create download, the input is not a valid torrent.");
     return;
   }
@@ -716,7 +745,7 @@ DownloadList::process_meta_download(Download* download) {
 
   erase_ptr(download);
 
-  control->core()->try_create_download_from_meta_download(bencode, metafile);
+  control->core()->try_create_download_from_meta_download(std::move(bencode), metafile);
 }
 
 }

src/core/download_list.h

@@ -3,6 +3,7 @@
 
 #include <iosfwd>
 #include <list>
+#include <memory>
 #include <string>
 
 namespace torrent {
@@ -20,9 +21,9 @@ class Download;
 //
 // Fix apply_on_ratio if the base_type is changed.
 
-class DownloadList : private std::list<Download*> {
+class DownloadList : private std::list<std::shared_ptr<Download>> {
 public:
-  typedef std::list<Download*>               base_type;
+  typedef std::list<std::shared_ptr<Download>> base_type;
 
   using base_type::iterator;
   using base_type::const_iterator;
@@ -64,8 +65,17 @@ public:
   bool                open(Download* d);
   void                open_throw(Download* d);
 
+  // Overloads for the list's own entries, so callers iterating it do not need
+  // to unwrap.
+  bool                open(const value_type& d)          { return open(d.get()); }
+  void                close(const value_type& d)         { close(d.get()); }
+  void                close_quick(const value_type& d)   { close_quick(d.get()); }
+  void                pause(const value_type& d)         { pause(d.get()); }
+  void                resume(const value_type& d)        { resume(d.get()); }
+
   void                close(Download* d);
   void                close_directly(Download* d);
+  void                close_files(Download* d);
   void                close_quick(Download* d);
   void                close_throw(Download* d);
 
@@ -123,6 +133,9 @@ private:
   void                hash_done(Download* d);
   void                hash_queue(Download* d, int type);
 
+  void                set_state_stopped(Download* d);
+  void                update_paused_state(Download* d);
+
   inline void         check_contains(Download* d);
 
   void                received_finished(Download* d);

src/core/manager.cc

@@ -154,10 +154,10 @@ Manager::cleanup() {
 void
 Manager::shutdown(bool force) {
   if (!force) {
-    for (auto d : *m_download_list)
+    for (const auto& d : *m_download_list)
-      m_download_list->pause_default(d);
+      m_download_list->pause_default(d.get());
   } else {
-    for (auto d : *m_download_list)
+    for (const auto& d : *m_download_list)
       m_download_list->close_quick(d);
   }
 }
@@ -195,14 +195,14 @@ Manager::try_create_download(const std::string& uri, int flags, const command_li
     return;
 
   // Adding download.
-  DownloadFactory* f = new DownloadFactory(this);
+  auto f = std::make_unique<DownloadFactory>(this);
 
   f->variables()["tied_to_file"] = (int64_t)(bool)(flags & create_tied);
   f->commands().insert(f->commands().end(), commands.begin(), commands.end());
 
   f->set_start(flags & create_start);
   f->set_print_log(!(flags & create_quiet));
-  f->slot_finished([f]() { delete f; });
+  f->slot_finished([factory = f.get()]() { delete factory; });
 
   if (is_data_uri(uri)) {
     // Allow the use of data URIs, primarily for JSON-RPC which
@@ -216,10 +216,13 @@ Manager::try_create_download(const std::string& uri, int flags, const command_li
   }
 
   f->commit();
+
+  // From here the finished slot deletes it.
+  f.release();
 }
 
 void
-Manager::try_create_download_from_meta_download(torrent::Object* bencode, const std::string& metafile) {
+Manager::try_create_download_from_meta_download(std::unique_ptr<torrent::Object> bencode, const std::string& metafile) {
   DownloadFactory* f = new DownloadFactory(this);
 
   f->variables()["tied_to_file"] = (int64_t)true;
@@ -405,7 +408,7 @@ Manager::receive_hashing_changed() {
       continue;
 
     try {
-      m_download_list->open_throw(*itr);
+      m_download_list->open_throw(itr->get());
 
       // Since the bitfield is allocated on loading of resume load or
       // hash start, and unallocated on close, we know that if it it

src/core/manager.h

@@ -76,7 +76,7 @@ public:
   // Temporary, find a better place for this.
   void                try_create_download(const std::string& uri, int flags, const command_list_type& commands);
   void                try_create_download_expand(const std::string& uri, int flags, command_list_type commands = command_list_type());
-  void                try_create_download_from_meta_download(torrent::Object* bencode, const std::string& metafile);
+  void                try_create_download_from_meta_download(std::unique_ptr<torrent::Object> bencode, const std::string& metafile);
 
 private:
   void                create_http(const std::string& uri);

src/core/view.cc

@@ -16,10 +16,20 @@
 namespace core {
 
 // Also add focus thingie here?
+// Matches the list entry that owns a given download.
+inline auto
+entry_is(Download* download) {
+  return [download](const std::shared_ptr<Download>& entry) { return entry.get() == download; };
+}
+
 struct view_downloads_compare {
   view_downloads_compare(const torrent::Object& cmd) :
       m_command(cmd) {}
 
+  bool operator()(const std::shared_ptr<Download>& d1, const std::shared_ptr<Download>& d2) const {
+    return (*this)(d1.get(), d2.get());
+  }
+
   bool operator()(Download* d1, Download* d2) const {
     try {
       if (m_command.is_empty())
@@ -54,6 +64,10 @@ struct view_downloads_filter {
   view_downloads_filter(const torrent::Object& cmd, const torrent::Object& cmd2) :
       m_command(cmd), m_command2(cmd2) {}
 
+  bool operator()(const std::shared_ptr<Download>& d1) const {
+    return (*this)(d1.get());
+  }
+
   bool operator()(Download* d1) const {
     return this->evalCmd(m_command, d1) && this->evalCmd(m_command2, d1);
   }
@@ -152,7 +166,7 @@ View::initialize(const std::string& name) {
 
 void
 View::erase(Download* download) {
-  iterator itr = std::find(base_type::begin(), base_type::end(), download);
+  iterator itr = std::find_if(base_type::begin(), base_type::end(), entry_is(download));
 
   if (itr >= end_visible()) {
     erase_internal(itr);
@@ -165,22 +179,24 @@ View::erase(Download* download) {
 
 void
 View::set_visible(Download* download) {
-  iterator itr = std::find(begin_filtered(), end_filtered(), download);
+  iterator itr = std::find_if(begin_filtered(), end_filtered(), entry_is(download));
 
   if (itr == end_filtered())
     return;
 
   // Don't optimize erase since we want to keep the order of the
   // non-visible elements.
+  auto entry = *itr;
+
   base_type::erase(itr);
-  insert_visible(download);
+  insert_visible(entry);
 
   rpc::call_object_nothrow(m_event_added, rpc::make_target(download));
 }
 
 void
 View::set_not_visible(Download* download) {
-  iterator itr = std::find(begin_visible(), end_visible(), download);
+  iterator itr = std::find_if(begin_visible(), end_visible(), entry_is(download));
 
   if (itr == end_visible())
     return;
@@ -190,15 +206,17 @@ View::set_not_visible(Download* download) {
 
   // Don't optimize erase since we want to keep the order of the
   // non-visible elements.
+  auto entry = *itr;
+
   base_type::erase(itr);
-  base_type::push_back(download);
+  base_type::push_back(entry);
 
   rpc::call_object_nothrow(m_event_removed, rpc::make_target(download));
 }
 
 void
 View::next_focus(unsigned int i) {
-  if (empty())
+  if (empty_visible())
     return;
 
   // If at the boundary, roll over
@@ -221,7 +239,7 @@ View::next_focus(unsigned int i) {
 
 void
 View::prev_focus(unsigned int i) {
-  if (empty())
+  if (empty_visible())
     return;
 
   // If at the boundary, roll over
@@ -241,12 +259,12 @@ View::prev_focus(unsigned int i) {
 
 void
 View::sort() {
-  Download* curFocus = focus() != end_visible() ? *focus() : NULL;
+  Download* curFocus = focus() != end_visible() ? focus()->get() : NULL;
 
   // Don't go randomly switching around equivalent elements.
   std::stable_sort(begin(), end_visible(), view_downloads_compare(m_sortCurrent));
 
-  m_focus = position(std::find(begin(), end_visible(), curFocus));
+  m_focus = position(std::find_if(begin(), end_visible(), entry_is(curFocus)));
   emit_changed();
 }
 
@@ -280,10 +298,10 @@ View::filter() {
   // set the elements to NULL as we trigger commands on them. Or
   // perhaps always clear them, thus not throwing anything.
   if (!m_event_removed.is_empty())
-    std::for_each(changed.begin(), splitChanged, std::bind(&rpc::call_object_d_nothrow, m_event_removed, std::placeholders::_1));
+    std::for_each(changed.begin(), splitChanged, [this](const auto& d) { rpc::call_object_d_nothrow(m_event_removed, d.get()); });
 
   if (!m_event_added.is_empty())
-    std::for_each(changed.begin(), splitChanged, std::bind(&rpc::call_object_d_nothrow, m_event_added, std::placeholders::_1));
+    std::for_each(splitChanged, changed.end(), [this](const auto& d) { rpc::call_object_d_nothrow(m_event_added, d.get()); });
 
   emit_changed();
 }
@@ -294,21 +312,23 @@ View::filter_by(const torrent::Object& condition, View::base_type& result) {
   view_downloads_filter matches = view_downloads_filter(condition, m_temp_filter);
 
   for (iterator itr = begin_visible(); itr != end_visible(); ++itr)
-    if (matches(*itr))
+    if (matches(itr->get()))
       result.push_back(*itr);
 }
 
 void
 View::filter_download(core::Download* download) {
-  iterator itr = std::find(base_type::begin(), base_type::end(), download);
+  iterator itr = std::find_if(base_type::begin(), base_type::end(), entry_is(download));
 
   if (itr == base_type::end())
     throw torrent::internal_error("View::filter_download(...) could not find download.");
 
   if (view_downloads_filter(m_filter, m_temp_filter)(download)) {
     if (itr >= end_visible()) {
+      auto entry = *itr;
+
       erase_internal(itr);
-      insert_visible(download);
+      insert_visible(entry);
 
       rpc::call_object_nothrow(m_event_added, rpc::make_target(download));
 
@@ -317,16 +337,20 @@ View::filter_download(core::Download* download) {
       // already visible.
       //
       // Consider removing this.
+      auto entry = *itr;
+
       erase_internal(itr);
-      insert_visible(download);
+      insert_visible(entry);
     }
 
   } else {
     if (itr >= end_visible())
       return;
 
+    auto entry = *itr;
+
     erase_internal(itr);
-    base_type::push_back(download);
+    base_type::push_back(entry);
 
     rpc::call_object_nothrow(m_event_removed, rpc::make_target(download));
   }
@@ -345,8 +369,8 @@ View::clear_filter_on() {
 }
 
 inline void
-View::insert_visible(Download* d) {
+View::insert_visible(const std::shared_ptr<Download>& d) {
-  auto itr = std::find_if(begin_visible(), end_visible(), [this, d](auto d2) { return view_downloads_compare(m_sortNew)(d, d2); });
+  auto itr = std::find_if(begin_visible(), end_visible(), [this, &d](const auto& d2) { return view_downloads_compare(m_sortNew)(d.get(), d2.get()); });
 
   m_size++;
   m_focus += (m_focus >= position(itr));

src/core/view.h

@@ -15,6 +15,7 @@
 
 #include <functional>
 #include <list>
+#include <memory>
 #include <string>
 #include <vector>
 #include <torrent/object.h>
@@ -26,9 +27,9 @@ namespace core {
 
 class Download;
 
-class View : private std::vector<Download*> {
+class View : private std::vector<std::shared_ptr<Download>> {
 public:
-  typedef std::vector<Download*> base_type;
+  typedef std::vector<std::shared_ptr<Download>> base_type;
   typedef std::function<void()>  slot_void;
   typedef std::list<slot_void>   signal_void;
 
@@ -72,7 +73,7 @@ public:
     emit_changed();
   }
 
-  void insert(Download* download) { base_type::push_back(download); }
+  void insert(const std::shared_ptr<Download>& download) { base_type::push_back(download); }
   void erase(Download* download);
 
   void set_visible(Download* download);
@@ -124,9 +125,9 @@ private:
   View(const View&);
   void        operator=(const View&);
 
-  void        push_back(Download* d) { base_type::push_back(d); }
+  void        push_back(const std::shared_ptr<Download>& d) { base_type::push_back(d); }
 
-  inline void insert_visible(Download* d);
+  inline void insert_visible(const std::shared_ptr<Download>& d);
   inline void erase_internal(iterator itr);
 
   void        emit_changed();

src/display/utils.cc

@@ -345,7 +345,7 @@ print_status_info(char* first, char* last) {
   if (!torrent::up_throttle_global()->is_throttled()) {
     first = print_buffer(first, last, "[Throttle off");
   } else {
-    first = print_buffer(first, last, "[Throttle %3i", torrent::up_throttle_global()->max_rate() / 1024);
+    first = print_buffer(first, last, "[Throttle %3i", (int)(torrent::up_throttle_global()->max_rate() / 1024));
 
     if (!throttle_up_names.empty())
       first = print_status_throttle_limit(first, last, true, throttle_up_names);
@@ -354,7 +354,7 @@ print_status_info(char* first, char* last) {
   if (!torrent::down_throttle_global()->is_throttled()) {
     first = print_buffer(first, last, " / off KB]");
   } else {
-    first = print_buffer(first, last, " / %3i", torrent::down_throttle_global()->max_rate() / 1024);
+    first = print_buffer(first, last, " / %3i", (int)(torrent::down_throttle_global()->max_rate() / 1024));
 
     if (!throttle_down_names.empty())
       first = print_status_throttle_limit(first, last, false, throttle_down_names);

src/display/window_download_list.cc

@@ -37,7 +37,7 @@ WindowDownloadList::set_view(core::View* l) {
 // Return a pair of ints, representing a) the ncurses attributes and b) the ncurses color pair ID to use
 std::pair<int, int>
 WindowDownloadList::get_attr_color(core::View::iterator selected) {
-  core::Download* item       = *selected;
+  core::Download* item       = selected->get();
   unsigned long   focus_attr = selected == m_view->focus() ? m_canvas->attr_map().at(RCOLOR_FOCUS) : 0;
   int             offset     = (((selected - m_view->begin_visible()) & 1) + 1) * RCOLOR_MAX; // Determine the even/odd offset for the color pair
   bool            active     = item->is_open() && item->is_active();
@@ -132,15 +132,15 @@ WindowDownloadList::redraw() {
       ColorKind focus_color = is_focused ? RCOLOR_FOCUS : RCOLOR_LABEL;
       auto      attr_color  = get_attr_color(range.first);
 
-      print_download_title(buffer.data(), last, *range.first);
+      print_download_title(buffer.data(), last, range.first->get());
       m_canvas->print(0, pos, "%c %s", focus_char, buffer.data());
       m_canvas->set_attr(2, pos++, -1, attr_color.first, attr_color.second);
 
-      print_download_info_full(buffer.data(), last, *range.first);
+      print_download_info_full(buffer.data(), last, range.first->get());
       m_canvas->print(0, pos, "%c %s", focus_char, buffer.data());
       m_canvas->set_attr(2, pos++, -1, focus_color);
 
-      print_download_status(buffer.data(), last, *range.first);
+      print_download_status(buffer.data(), last, range.first->get());
       m_canvas->print(0, pos, "%c %s", focus_char, buffer.data());
       m_canvas->set_attr(2, pos++, -1, focus_color);
 
@@ -152,7 +152,7 @@ WindowDownloadList::redraw() {
       char focus_char = range.first == m_view->focus() ? '*' : ' ';
       auto attr_color = get_attr_color(range.first);
 
-      print_download_info_compact(buffer.data(), last, *range.first);
+      print_download_info_compact(buffer.data(), last, range.first->get());
       m_canvas->print(0, pos, "%c %s", focus_char, buffer.data());
       m_canvas->set_attr(2, pos++, -1, attr_color.first, attr_color.second);
 

src/display/window_file_list.cc

@@ -25,7 +25,10 @@ WindowFileList::WindowFileList(const ui::ElementFileList* element) :
 // Convert std::string to std::wstring of given width (in screen positions),
 // taking into account that some characters may be occupying two screen positions.
 std::wstring
-wstring_width(const std::string& i_str, [[maybe_unused]] int width) {
+wstring_width(const std::string& i_str, int width) {
+  if (width < 0)
+    width = 0;
+
   std::wstring result(width + 1, L' ');
   size_t length = std::mbstowcs(result.data(), i_str.c_str(), width);
 

src/display/window_log.cc

@@ -1,6 +1,8 @@
 #include "config.h"
 
 #include <ctime>
+#include <mutex>
+#include <vector>
 #include <torrent/torrent.h>
 #include <torrent/system/callbacks.h>
 #include <torrent/system/thread.h>
@@ -41,13 +43,20 @@ WindowLog::redraw() {
 
   int pos = m_canvas->height();
 
-  for (iterator itr = m_log->end(), last = find_older(); itr != last && pos > 0; --pos) {
+  std::vector<torrent::log_entry> entries;
-    itr--;
 
+  {
+    std::lock_guard<torrent::log_buffer> guard(*m_log);
+
+    for (iterator itr = m_log->end(), last = find_older(); itr != last && entries.size() < static_cast<size_t>(pos); )
+      entries.push_back(*--itr);
+  }
+
+  for (const auto& entry : entries) {
     char buffer[16];
-    print_hhmmss_local(buffer, buffer + 16, static_cast<time_t>(itr->timestamp));
+    print_hhmmss_local(buffer, buffer + 16, static_cast<time_t>(entry.timestamp));
 
-    m_canvas->print(0, pos - 1, "(%s) %s", buffer, itr->message.c_str());
+    m_canvas->print(0, --pos, "(%s) %s", buffer, entry.message.c_str());
   }
 }
 
@@ -60,8 +69,13 @@ WindowLog::receive_update() {
   if (!is_active())
     return;
 
-  auto itr    = find_older();
+  std::iterator_traits<iterator>::difference_type height;
-  auto height = std::min(std::distance(itr, (iterator)m_log->end()), (std::iterator_traits<iterator>::difference_type)10);
+
+  {
+    std::lock_guard<torrent::log_buffer> guard(*m_log);
+
+    height = std::min(std::distance(find_older(), (iterator)m_log->end()), (std::iterator_traits<iterator>::difference_type)10);
+  }
 
   if (height != m_max_height) {
     m_min_height = height != 0 ? 1 : 0;

src/display/window_log_complete.cc

@@ -1,6 +1,8 @@
 #include "config.h"
 
 #include <ctime>
+#include <mutex>
+#include <vector>
 
 #include "canvas.h"
 #include "utils.h"
@@ -29,24 +31,34 @@ WindowLogComplete::redraw() {
 
   int pos = m_canvas->height();
 
-  for (iterator itr = m_log->end(), last = m_log->begin(); itr != last && pos > 0; ) {
+  std::vector<torrent::log_entry> entries;
-    itr--;
+
+  {
+    std::lock_guard<torrent::log_buffer> guard(*m_log);
+
+    for (iterator itr = m_log->end(), last = m_log->begin(); itr != last && entries.size() < static_cast<size_t>(pos); )
+      entries.push_back(*--itr);
+  }
+
+  for (const auto& entry : entries) {
+    if (pos <= 0)
+      break;
 
     char buffer[16];
 
     // Use an arbitrary min width of 60 for allowing multiple
     // lines. This should ensure we don't mess up the display when the
     // screen is shrunk too much.
-    unsigned int timeWidth = 3 + print_hhmmss_local(buffer, buffer + 16, static_cast<time_t>(itr->timestamp)) - buffer;
+    unsigned int timeWidth = 3 + print_hhmmss_local(buffer, buffer + 16, static_cast<time_t>(entry.timestamp)) - buffer;
 
     unsigned int logWidth  = m_canvas->width() > 60 ? (m_canvas->width() - timeWidth) : (60 - timeWidth);
-    unsigned int logHeight = (itr->message.size() + logWidth - 1) / logWidth;
+    unsigned int logHeight = (entry.message.size() + logWidth - 1) / logWidth;
 
     for (unsigned int j = logHeight; j > 0 && pos > 0; --j, --pos)
       if (j == 1)
-        m_canvas->print(0, pos - 1, "(%s) %s", buffer, itr->message.substr(0, m_canvas->width() - timeWidth).c_str());
+        m_canvas->print(0, pos - 1, "(%s) %s", buffer, entry.message.substr(0, m_canvas->width() - timeWidth).c_str());
       else
-        m_canvas->print(timeWidth, pos - 1, "%s", itr->message.substr(logWidth * (j - 1), m_canvas->width() - timeWidth).c_str());
+        m_canvas->print(timeWidth, pos - 1, "%s", entry.message.substr(logWidth * (j - 1), m_canvas->width() - timeWidth).c_str());
   }
 }
 

src/globals.cc

@@ -3,6 +3,7 @@
 #include "globals.h"
 
 #include <cstdlib>
+#include <stdlib.h>
 #include <torrent/exceptions.h>
 
 rpc::ip_table_list ip_tables;
@@ -28,3 +29,32 @@ expand_path(const std::string& path) {
 
   return path;
 }
+
+// Resolves a path to a canonical one with no symlinks or relative components,
+// so it can safely be handed to an external script. Returns an empty string if
+// the path does not name an existing file or directory.
+std::string
+resolve_path(const std::string& path) {
+  if (path.empty())
+    return std::string();
+
+  char* resolved = ::realpath(expand_path(path).c_str(), nullptr);
+
+  if (resolved == nullptr)
+    return std::string();
+
+  std::string result(resolved);
+  std::free(resolved);
+
+  return result;
+}
+
+std::string
+resolve_path_or_throw(const std::string& path) {
+  auto result = resolve_path(path);
+
+  if (result.empty())
+    throw torrent::input_error("Could not resolve path: '" + path + "'.");
+
+  return result;
+}

src/globals.h

@@ -11,6 +11,8 @@ extern rpc::ip_table_list ip_tables;
 extern Control*           control;
 
 std::string expand_path(const std::string& path);
+std::string resolve_path(const std::string& path);
+std::string resolve_path_or_throw(const std::string& path);
 
 namespace rpc {
 class SCgi;

src/main.cc

@@ -379,6 +379,12 @@ main(int argc, char** argv) {
         lt_log_print(torrent::LOG_WARN, "network.max_open_files.set is deprecated, use system.sockets.files.min_alloc.set instead.");
       });
 
+    // TODO: Keep d.directory_base for a while as it is widely used.
+    CMD_REDIRECT("d.directory_base",     "d.directory");
+    CMD_REDIRECT("d.directory_base.set", "d.directory.base.set");
+
+    rpc::rpc.mark_safe("d.directory_base");
+
     // if (rpc::call_command_value("method.use_intermediate") == 1) {
 
     // } else if (rpc::call_command_value("method.use_intermediate") == 2) {
@@ -544,8 +550,6 @@ handle_sigbus(int signum, siginfo_t* sa, [[maybe_unused]] void* ptr) {
 #else
   output << "Stack dump not enabled." << std::endl;
 #endif
-  output << std::endl << "Error: " << std::strerror(sa->si_errno) << std::endl;
-
   const char* signal_reason;
 
   switch (sa->si_code) {

src/rpc/command.cc

@@ -1,5 +1,7 @@
 #include "config.h"
 
+#include <limits>
+
 #include "core/download.h"
 #include "parse.h"
 
@@ -41,7 +43,13 @@ command_base_call_value_base(command_base* command_raw, target_type target, cons
     return command_base::_call<typename command_value_function<T>::type, T>(command_raw, target, val);
   }
 
-  return command_base::_call<typename command_value_function<T>::type, T>(command_raw, target, unit * arg.as_value());
+  auto value = arg.as_value();
+
+  if (value > std::numeric_limits<int64_t>::max() / unit ||
+      value < std::numeric_limits<int64_t>::min() / unit)
+    throw torrent::input_error("Value out of range.");
+
+  return command_base::_call<typename command_value_function<T>::type, T>(command_raw, target, unit * value);
 }
 
 template <typename T> const torrent::Object

src/rpc/command_map.h

@@ -1,6 +1,7 @@
 #ifndef RTORRENT_RPC_COMMAND_MAP_H
 #define RTORRENT_RPC_COMMAND_MAP_H
 
+#include <memory>
 #include <map>
 #include <string>
 #include <cstring>
@@ -104,6 +105,10 @@ inline target_type make_target(T target) {
   return target_type((int)target_type_id<T>::value, target);
 }
 
+inline target_type make_target(const std::shared_ptr<core::Download>& target) {
+  return make_target(target.get());
+}
+
 template <typename T>
 inline target_type make_target_pair(T target1, T target2) {
   return target_type((int)target_type_id<T, T>::value, target1, target2);

src/rpc/command_scheduler.cc

@@ -61,14 +61,20 @@ CommandScheduler::call_item(value_type item) {
   // Remove the item before calling the command if it should be
   // removed.
 
+  std::string key = item->key();
+
   try {
     rpc::call_object(item->command());
 
   } catch (torrent::input_error& e) {
     if (m_slotErrorMessage)
-      m_slotErrorMessage("Scheduled command failed: " + item->key() + ": " + e.what());
+      m_slotErrorMessage("Scheduled command failed: " + key + ": " + e.what());
   }
 
+  // The command is allowed to erase or replace this item, which deletes it.
+  if (std::find(begin(), end(), item) == end())
+    return;
+
   // Still schedule if we caught a torrrent::input_error?
   auto next = item->next_time_scheduled();
 

src/rpc/jsonrpc.cc

@@ -13,6 +13,7 @@
 #include "rpc/command_map.h"
 #include "rpc/nlohmann/json.h"
 #include "rpc/parse_commands.h"
+#include "rpc/scgi_task.h"
 #include "torrent/exceptions.h"
 #include "torrent/object.h"
 #include "utils/functional.h"
@@ -26,10 +27,12 @@ constexpr int JSONRPC_METHOD_NOT_FOUND_ERROR = -32601;
 constexpr int JSONRPC_INVALID_PARAMS_ERROR   = -32602;
 constexpr int JSONRPC_INTERNAL_ERROR         = -32000;
 
+constexpr uint32_t max_json_depth = 1024;
+
 using json = nlohmann::json;
 
 torrent::Object
-json_to_object(const json& value) {
+json_to_object(const json& value, uint32_t depth = 0) {
   switch (value.type()) {
   case json::value_t::number_unsigned:
   case json::value_t::number_integer:
@@ -42,20 +45,26 @@ json_to_object(const json& value) {
     return torrent::Object(value.get<std::string>());
 
   case json::value_t::array: {
+    if (++depth >= max_json_depth)
+      throw torrent::input_error("invalid parameters: max depth reached");
+
     auto  array_raw = torrent::Object::create_list();
     auto& array     = array_raw.as_list();
 
     for (const auto& entry : value)
-      array.push_back(json_to_object(entry));
+      array.push_back(json_to_object(entry, depth));
 
     return array_raw;
   }
   case json::value_t::object: {
+    if (++depth >= max_json_depth)
+      throw torrent::input_error("invalid parameters: max depth reached");
+
     auto  map_raw = torrent::Object::create_map();
     auto& map     = map_raw.as_map();
 
     for (const auto& entry : value.items())
-      map[entry.key()] = json_to_object(entry.value());
+      map[entry.key()] = json_to_object(entry.value(), depth);
 
     return map_raw;
   }
@@ -138,7 +147,7 @@ jsonrpc_call_command(const std::string& method, const json& params) {
 
   CommandMap::iterator itr = commands.find(method.c_str());
 
-  if (itr == commands.end()) {
+  if (itr == commands.end() || !(itr->second.m_flags & CommandMap::flag_public_rpc)) {
     throw rpc_error(JSONRPC_METHOD_NOT_FOUND_ERROR, "method not found: " + method);
   }
 
@@ -256,13 +265,17 @@ JsonRpc::process(const char* in_buffer, uint32_t length, slot_write callback) {
 
     std::string response_str = response.dump();
 
+    if (response_str.size() > SCgiTask::max_response_size) {
+      const auto& id = response.is_object() && response.contains("id") ? response["id"] : json(nullptr);
+      auto err_str = json_error(JSONRPC_INTERNAL_ERROR, "response size exceeds maximum RPC limit", id).dump();
+
+      return callback(err_str.c_str(), err_str.size());
+    }
+
     return callback(response_str.c_str(), response_str.size());
 
-  } catch (json::parse_error& e) {
+  } catch (json::exception& e) {
-    auto err_str = json_error(JSONRPC_PARSE_ERROR, e.what(), nullptr).dump(-1, ' ', false, json::error_handler_t::replace);
+    // Exception strings may contain invalid UTF-8, hence the ::replace
-    return callback(err_str.c_str(), err_str.size());
-  } catch (json::type_error& e) {
-    // Type errors may be caused by invalid UTF-8 strings in exception strings, hence the ::replace
     auto err_str = json_error(JSONRPC_PARSE_ERROR, e.what(), nullptr).dump(-1, ' ', false, json::error_handler_t::replace);
     return callback(err_str.c_str(), err_str.size());
   }

src/rpc/object_storage.cc

@@ -64,8 +64,12 @@ object_storage::insert(const char* key_data, uint32_t key_size, const torrent::O
   if (std::find(key_data, key_data + key_size, '\0') != key_data + key_size)
     throw torrent::input_error("Found nul-char in string.");
 
-  // Check for size > key_size.
+  // key_type turns a key this long into the empty key.
-  // Check for empty string.
+  if (key_size >= object_storage::key_size)
+    throw torrent::input_error("Key is too long.");
+
+  if (key_size == 0)
+    throw torrent::input_error("Key is empty.");
 
   bool use_raw = false;
   torrent::Object object;

src/rpc/parse.cc

@@ -2,6 +2,7 @@
 
 #include <cstring>
 #include <cstdio>
+#include <limits>
 #include <locale>
 #include <torrent/exceptions.h>
 
@@ -10,6 +11,8 @@
 
 namespace rpc {
 
+constexpr uint32_t max_parse_depth = 1024;
+
 const char*
 parse_skip_wspace(const char* first, const char* last) {
   while (first != last && parse_is_space(*first))
@@ -99,6 +102,12 @@ parse_whole_value_nothrow(const char* src, int64_t* value, int base, int unit) {
   return true;
 }
 
+static bool
+value_fits_shifted(int64_t value, int shift) {
+  return value <= (std::numeric_limits<int64_t>::max() >> shift) &&
+         value >= (std::numeric_limits<int64_t>::min() >> shift);
+}
+
 const char*
 parse_value_nothrow(const char* src, int64_t* value, int base, int unit) {
   if (unit <= 0)
@@ -121,20 +130,26 @@ parse_value_nothrow(const char* src, int64_t* value, int base, int unit) {
   case 'B': ++last; break;
   case 'k':
   case 'K':
-    if (*value > (int64_t)0x1FFFFFFFFFFFFF) return src; // overflow guard
+    if (!value_fits_shifted(*value, 10)) return src; // overflow guard
     *value = *value << 10; ++last; break;
   case 'm':
   case 'M':
-    if (*value > (int64_t)0x7FFFFFFFFFF) return src; // overflow guard
+    if (!value_fits_shifted(*value, 20)) return src; // overflow guard
     *value = *value << 20; ++last; break;
   case 'g':
   case 'G':
-    if (*value > (int64_t)0x1FFFFFFFF) return src; // overflow guard
+    if (!value_fits_shifted(*value, 30)) return src; // overflow guard
     *value = *value << 30; ++last; break;
 //   case ' ':
 //   case '\0': *value = *value * unit; break;
 //   default: throw torrent::input_error("Could not parse value.");
-  default: *value = *value * unit; break;
+  default:
+    if (*value > std::numeric_limits<int64_t>::max() / unit ||
+        *value < std::numeric_limits<int64_t>::min() / unit)
+      return src; // overflow guard
+
+    *value = *value * unit;
+    break;
   }
 
   return last;
@@ -142,10 +157,13 @@ parse_value_nothrow(const char* src, int64_t* value, int base, int unit) {
 
 // Somewhat ugly...
 const char*
-parse_object(const char* first, const char* last, torrent::Object* dest, bool (*delim)(const char)) {
+parse_object(const char* first, const char* last, torrent::Object* dest, bool (*delim)(const char), uint32_t depth) {
+  if (++depth >= max_parse_depth)
+    throw torrent::input_error("Max parse depth reached.");
+
   if (*first == '{') {
     *dest = torrent::Object::create_list();
-    first = parse_list(first + 1, last, dest, &parse_is_delim_block);
+    first = parse_list(first + 1, last, dest, &parse_is_delim_block, depth);
     first = parse_skip_wspace(first, last);
 
     if (first == last || *first != '}')
@@ -154,18 +172,18 @@ parse_object(const char* first, const char* last, torrent::Object* dest, bool (*
     return ++first;
 
   } else if (*first == '(') {
-    int32_t depth = 1;
+    int32_t parentheses = 1;
 
     while (first + 1 != last && *(first + 1) == '(') {
       first++;
-      depth++;
+      parentheses++;
     }
 
-    if (depth > 3)
+    if (parentheses > 3)
       throw torrent::input_error("Max 3 parentheses per object allowed.");
 
     *dest = torrent::Object::create_dict_key();
-    dest->set_flags(torrent::Object::flag_function << (depth - 1));
+    dest->set_flags(torrent::Object::flag_function << (parentheses - 1));
 
     first = parse_string(first + 1, last, &dest->as_dict_key(), &parse_is_delim_func);
     first = parse_skip_wspace(first, last);
@@ -176,16 +194,16 @@ parse_object(const char* first, const char* last, torrent::Object* dest, bool (*
     if (*first == ',') {
       // This will always create a list even for single argument functions...
       dest->as_dict_obj() = torrent::Object::create_list();
-      first = parse_list(first + 1, last, &dest->as_dict_obj(), &parse_is_delim_func);
+      first = parse_list(first + 1, last, &dest->as_dict_obj(), &parse_is_delim_func, depth);
       first = parse_skip_wspace(first, last);
     }
 
-    while (depth != 0 && first != last && *first == ')') {
+    while (parentheses != 0 && first != last && *first == ')') {
       first++;
-      depth--;
+      parentheses--;
     }
 
-    if (depth != 0)
+    if (parentheses != 0)
       throw torrent::input_error("Parentheses mismatch.");
 
     return first;
@@ -198,7 +216,7 @@ parse_object(const char* first, const char* last, torrent::Object* dest, bool (*
 }
 
 const char*
-parse_list(const char* first, const char* last, torrent::Object* dest, bool (*delim)(const char)) {
+parse_list(const char* first, const char* last, torrent::Object* dest, bool (*delim)(const char), uint32_t depth) {
   if (!dest->is_list())
     throw torrent::internal_error("parse_list(...) !dest->is_list().");
 
@@ -206,7 +224,7 @@ parse_list(const char* first, const char* last, torrent::Object* dest, bool (*de
     torrent::Object tmp;
 
     first = parse_skip_wspace(first, last);
-    first = parse_object(first, last, &tmp, delim);
+    first = parse_object(first, last, &tmp, delim, depth);
     first = parse_skip_wspace(first, last);
 
     dest->as_list().push_back(tmp);
@@ -221,9 +239,9 @@ parse_list(const char* first, const char* last, torrent::Object* dest, bool (*de
 }
 
 const char*
-parse_whole_list(const char* first, const char* last, torrent::Object* dest, bool (*delim)(const char)) {
+parse_whole_list(const char* first, const char* last, torrent::Object* dest, bool (*delim)(const char), uint32_t depth) {
   first = parse_skip_wspace(first, last);
-  first = parse_object(first, last, dest, delim);
+  first = parse_object(first, last, dest, delim, depth);
   first = parse_skip_wspace(first, last);
 
   if (first != last && parse_is_seperator(*first)) {
@@ -231,7 +249,7 @@ parse_whole_list(const char* first, const char* last, torrent::Object* dest, boo
     tmp.swap(*dest);
 
     dest->as_list().push_back(tmp);
-    first = parse_list(++first, last, dest, delim);
+    first = parse_list(++first, last, dest, delim, depth);
   }
 
   return first;

src/rpc/parse.h

@@ -77,9 +77,9 @@ const char* parse_value_nothrow(const char* first, const char* last, int64_t* va
 void        parse_whole_value(const char* src, int64_t* value, int base = 0, int unit = 1);
 bool        parse_whole_value_nothrow(const char* src, int64_t* value, int base = 0, int unit = 1);
 
-const char* parse_object    (const char* first, const char* last, torrent::Object* dest, bool (*delim)(const char) = &parse_is_delim_default);
+const char* parse_object    (const char* first, const char* last, torrent::Object* dest, bool (*delim)(const char) = &parse_is_delim_default, uint32_t depth = 0);
-const char* parse_list      (const char* first, const char* last, torrent::Object* dest, bool (*delim)(const char) = &parse_is_delim_default);
+const char* parse_list      (const char* first, const char* last, torrent::Object* dest, bool (*delim)(const char) = &parse_is_delim_default, uint32_t depth = 0);
-const char* parse_whole_list(const char* first, const char* last, torrent::Object* dest, bool (*delim)(const char) = &parse_is_delim_default);
+const char* parse_whole_list(const char* first, const char* last, torrent::Object* dest, bool (*delim)(const char) = &parse_is_delim_default, uint32_t depth = 0);
 
 std::string convert_to_string(const torrent::Object& src);
 

src/rpc/parse_commands.cc

@@ -181,6 +181,11 @@ parse_command_file(const std::string& path) {
       getCount = 0;
     }
 
+    if (file.fail() && !file.eof()) {
+      lineNumber++;
+      throw torrent::input_error("Exceeded max line length.");
+    }
+
   } catch (torrent::input_error& e) {
     snprintf(buffer, 2048, "Error in option file: %s:%u: %s", path.c_str(), lineNumber, e.what());
 

src/rpc/rpc_manager.cc

@@ -167,6 +167,17 @@ RpcManager::cleanup() {
   m_jsonrpc.cleanup();
 }
 
+void
+RpcManager::set_size_limit(uint64_t size) {
+  if (size > SCgiTask::max_content_size)
+    throw torrent::input_error("XMLRPC size limit cannot exceed the SCGI content size limit.");
+
+  if (size < min_size_limit)
+    throw torrent::input_error("XMLRPC size limit is too small to hold a request.");
+
+  m_xmlrpc.set_size_limit(size);
+}
+
 void
 RpcManager::insert_command(const char* name, const char* parm, const char* doc) {
   m_xmlrpc.insert_command(name, parm, doc);

src/rpc/rpc_manager.h

@@ -53,6 +53,10 @@ public:
   enum RPCType { XML,
                  JSON };
 
+  // A limit below the shortest useful request rejects every request, the one
+  // that would raise it again included.
+  static constexpr uint64_t min_size_limit = 1024;
+
   RpcManager()  = default;
   ~RpcManager() = default;
 
@@ -62,7 +66,7 @@ public:
   void                cleanup();
 
   int64_t             size_limit()                  { return m_xmlrpc.size_limit(); };
-  void                set_size_limit(uint64_t size) { m_xmlrpc.set_size_limit(size); };
+  void                set_size_limit(uint64_t size);
 
   int                 dialect()                     { return m_xmlrpc.dialect(); }
   void                set_dialect(int dialect)      { m_xmlrpc.set_dialect(dialect); }

src/rpc/scgi_task.cc

@@ -14,6 +14,7 @@
 #include <torrent/runtime/socket_manager.h>
 #include <torrent/system/callbacks.h>
 #include <torrent/system/poll.h>
+#include <torrent/system/scheduler.h>
 #include <torrent/utils/log.h>
 
 #include "control.h"
@@ -27,6 +28,8 @@ namespace rpc {
 SCgiTask::SCgiTask()
   : m_callback_id(torrent::system::make_callback_id()) {
 
+  m_task_timeout.slot() = [this]() { close(); };
+
   reset_file_descriptor();
 }
 
@@ -50,6 +53,8 @@ SCgiTask::open(SCgi* parent, int fd) {
   torrent::this_thread::poll()->open(this);
   torrent::this_thread::poll()->insert_read(this);
 
+  torrent::this_thread::scheduler()->update_wait_for_ceil_seconds(&m_task_timeout, timeout_request);
+
   auto lock = std::lock_guard<std::mutex>(m_result_mutex);
 
   // Leave room for terminating nul byte for parsing the header.
@@ -61,6 +66,8 @@ SCgiTask::cancel_open() {
   if (!is_open())
     return;
 
+  torrent::this_thread::scheduler()->erase(&m_task_timeout);
+
   torrent::this_thread::poll()->remove_and_close(this);
 
   torrent::fd_close(file_descriptor());
@@ -72,6 +79,8 @@ SCgiTask::close() {
   if (!is_open())
     return;
 
+  torrent::this_thread::scheduler()->erase(&m_task_timeout);
+
   torrent::system::cancel_callback_and_wait(m_callback_id, scgi_thread::thread(), torrent::main_thread::thread());
 
   torrent::runtime::socket_manager()->close_event_or_throw(this, [this]() {
@@ -84,7 +93,8 @@ SCgiTask::close() {
   // The callbacks are guaranteed to be finished/canceled at this point.
   auto lock = std::lock_guard<std::mutex>(m_result_mutex);
 
-  m_buffer.clear();
+  // clear() would keep the capacity, and the task is pooled for the lifetime of the process.
+  std::vector<char>().swap(m_buffer);
 }
 
 void
@@ -94,8 +104,12 @@ SCgiTask::event_read() {
   if (m_content_length == 0)
     read_length--;
 
-  if (read_length <= 0)
+  if (read_length <= 0) {
+    if (m_content_length == 0)
+      return close();
+
     throw torrent::internal_error("SCgiTask::event_read() no space in buffer for event_read.");
+  }
 
   int bytes = ::recv(file_descriptor(), m_buffer.data() + m_position, read_length, 0);
 
@@ -154,6 +168,8 @@ SCgiTask::event_read() {
 
   torrent::this_thread::poll()->remove_read(this);
 
+  torrent::this_thread::scheduler()->update_wait_for_ceil_seconds(&m_task_timeout, timeout_request);
+
   if (m_parent->log_fd() >= 0) {
     [[maybe_unused]] int result;
 
@@ -389,7 +405,7 @@ void
 SCgiTask::receive_write(const char* buffer, uint32_t length) {
   assert(torrent::this_thread::thread() == torrent::main_thread::thread());
 
-  if (buffer == nullptr || length > (100 << 20))
+  if (buffer == nullptr || length > max_response_size)
     throw torrent::internal_error("SCgiTask::receive_write(...) received bad input.");
 
   // Main thread callback already locked this mutex.

src/rpc/scgi_task.h

@@ -1,10 +1,13 @@
 #ifndef RTORRENT_RPC_SCGI_TASK_H
 #define RTORRENT_RPC_SCGI_TASK_H
 
+#include <chrono>
+#include <cstdint>
 #include <memory>
 #include <mutex>
 #include <vector>
 #include <torrent/system/event.h>
+#include <torrent/system/scheduler.h>
 
 namespace rpc {
 
@@ -14,7 +17,11 @@ class SCgiTask : public torrent::system::Event {
 public:
   static constexpr int default_buffer_size = 8191;
   static constexpr int max_header_size     = 2000;
-  static constexpr int max_content_size    = (2 << 23);
+  static constexpr int max_content_size    = (1 << 26);
+
+  static constexpr uint32_t max_response_size = (100 << 20);
+
+  static constexpr auto timeout_request = std::chrono::seconds(60);
 
   enum ContentType { XML, JSON };
 
@@ -54,8 +61,9 @@ private:
   void                plaintext_response(const char* buffer, uint32_t content_length);
   void                gzip_response(const char* buffer, uint32_t content_length);
 
-  SCgi*                        m_parent{};
+  SCgi*                           m_parent{};
-  torrent::system::callback_id m_callback_id;
+  torrent::system::callback_id    m_callback_id;
+  torrent::system::SchedulerEntry m_task_timeout;
 
   std::mutex          m_result_mutex;
 

src/rpc/xmlrpc_c.cc

@@ -27,11 +27,11 @@ public:
   virtual ~xmlrpc_error_c() throw() {}
 
   virtual int         type() const throw() { return m_type; }
-  virtual const char* what() const throw() { return m_msg; }
+  virtual const char* what() const throw() { return m_msg.c_str(); }
 
 private:
   int                 m_type;
-  const char*         m_msg;
+  std::string         m_msg;
 };
 
 torrent::Object xmlrpc_to_object(xmlrpc_env* env, xmlrpc_value* value, int call_type = 0, rpc::target_type* target = NULL, std::function<void()>* deleter = NULL);
@@ -44,10 +44,9 @@ xmlrpc_list_entry_to_object(xmlrpc_env* env, xmlrpc_value* src, int index) {
   if (env->fault_occurred)
     throw xmlrpc_error_c(env);
 
-  torrent::Object obj = xmlrpc_to_object(env, tmp);
+  utils::scope_guard guard([tmp]() { xmlrpc_DECREF(tmp); });
-  xmlrpc_DECREF(tmp);
 
-  return obj;
+  return xmlrpc_to_object(env, tmp);
 }
 
 int64_t
@@ -77,16 +76,18 @@ xmlrpc_list_entry_to_value(xmlrpc_env* env, xmlrpc_value* src, int index) {
   {
     const char* str;
     xmlrpc_read_string(env, tmp, &str);
+    xmlrpc_DECREF(tmp);
 
     if (env->fault_occurred)
       throw xmlrpc_error_c(env);
 
     const char* end = str;
     int64_t v3 = ::strtoll(str, (char**)&end, 0);
+    bool invalid = *str == '\0' || *end != '\0';
 
     ::free((void*)str);
 
-    if (*str == '\0' || *end != '\0')
+    if (invalid)
       throw xmlrpc_error_c(XMLRPC_TYPE_ERROR, "Invalid index.");
 
     return v3;
@@ -211,11 +212,11 @@ xmlrpc_to_object(xmlrpc_env* env, xmlrpc_value* value, int call_type, rpc::targe
       if (env->fault_occurred)
         throw xmlrpc_error_c(env);
 
+      utils::scope_guard guard([tmp]() { xmlrpc_DECREF(tmp); });
+
       if (target != nullptr)
         std::tie(*target, *deleter) = xmlrpc_to_target(env, tmp, call_type);
 
-      xmlrpc_DECREF(tmp);
-
       if (env->fault_occurred)
         throw xmlrpc_error_c(env);
 
@@ -451,6 +452,11 @@ XmlRpc::process(const char* inBuffer, uint32_t length, slot_write slotWrite) {
   if (local_env.fault_occurred && local_env.fault_code == XMLRPC_INTERNAL_ERROR)
     throw torrent::internal_error("Internal error in XMLRPC.");
 
+  if (memblock == nullptr) {
+    xmlrpc_env_clean(&local_env);
+    return false;
+  }
+
   bool result = slotWrite((const char*)xmlrpc_mem_block_contents(memblock),
                           xmlrpc_mem_block_size(memblock));
 
@@ -524,9 +530,6 @@ XmlRpc::size_limit() {
 
 void
 XmlRpc::set_size_limit(uint64_t size) {
-  if (size >= (64 << 20))
-    throw torrent::input_error("Invalid XMLRPC limit size.");
-
   xmlrpc_limit_set(XMLRPC_XML_SIZE_LIMIT_ID, size);
 }
 

src/rpc/xmlrpc_tinyxml2.cc

@@ -19,6 +19,7 @@
 #include "rpc/tinyxml2/tinyxml2.h"
 #include "rpc/rpc_manager.h"
 #include "utils/base64.h"
+#include "utils/functional.h"
 #include "xmlrpc.h"
 
 namespace rpc {
@@ -49,13 +50,23 @@ element_access(const tinyxml2::XMLElement* elem, std::initializer_list<std::stri
   return result;
 }
 
+const char*
+element_text_value(const tinyxml2::XMLNode* node) {
+  auto text = node->ToText();
+
+  if (text == nullptr)
+    throw rpc_error(XMLRPC_TYPE_ERROR, "expected a text value");
+
+  return text->Value();
+}
+
 long long
 element_to_int(const tinyxml2::XMLNode* elem) {
   char* pos;
   if (elem->FirstChild() == nullptr) {
     throw rpc_error(XMLRPC_TYPE_ERROR, "unable to parse empty integer");
   }
-  auto str    = elem->FirstChild()->ToText()->Value();
+  auto str    = element_text_value(elem->FirstChild());
   auto result = std::strtoll(str, &pos, 10);
   if (pos == str || *pos != '\0')
     throw rpc_error(XMLRPC_TYPE_ERROR, "unable to parse integer value");
@@ -85,7 +96,7 @@ xml_value_to_object(const tinyxml2::XMLNode* elem) {
     if (child_element == nullptr)
       return torrent::Object("");
 
-    return torrent::Object(child_element->ToText()->Value());
+    return torrent::Object(element_text_value(child_element));
 
   } else if (std::strncmp(root_type, "int", sizeof("int")) == 0 ||
              std::strncmp(root_type, "i4", sizeof("i4")) == 0 ||
@@ -98,7 +109,7 @@ xml_value_to_object(const tinyxml2::XMLNode* elem) {
     if (child_element == nullptr)
       throw rpc_error(XMLRPC_TYPE_ERROR, "empty boolean element");
 
-    auto boolean_text = std::string(child_element->ToText()->Value());
+    auto boolean_text = std::string(element_text_value(child_element));
 
     if (boolean_text == "1")
       return torrent::Object((int64_t)1);
@@ -129,7 +140,12 @@ xml_value_to_object(const tinyxml2::XMLNode* elem) {
       if (name_element == nullptr)
         throw rpc_error(XMLRPC_PARSE_ERROR, "struct member missing name element");
 
-      map[name_element->GetText()] = std::move(xml_value_to_object(child->FirstChildElement("value")));
+      auto name_text = name_element->GetText();
+
+      if (name_text == nullptr)
+        throw rpc_error(XMLRPC_PARSE_ERROR, "struct member has an empty name element");
+
+      map[name_text] = std::move(xml_value_to_object(child->FirstChildElement("value")));
     }
 
     return map_raw;
@@ -140,7 +156,7 @@ xml_value_to_object(const tinyxml2::XMLNode* elem) {
     if (child_element == nullptr)
       return torrent::Object("");
 
-    return torrent::Object(utils::decode_base64(utils::remove_newlines(child_element->ToText()->Value())));
+    return torrent::Object(utils::decode_base64(utils::remove_newlines(element_text_value(child_element))));
 
   } else {
     throw rpc_error(XMLRPC_INTERNAL_ERROR, "received unsupported value type: " + std::string(root_type));
@@ -243,6 +259,8 @@ execute_command(std::string method_name, const tinyxml2::XMLElement* params_elem
   torrent::Object             params_raw = torrent::Object::create_list();
   torrent::Object::list_type& params     = params_raw.as_list();
   rpc::target_type            target     = rpc::make_target();
+  std::function<void()>       deleter    = []() {};
+  utils::scope_guard          guard([&deleter]() { deleter(); });
 
   if (params_element != nullptr) {
     if (std::strncmp(params_element->Name(), "params", sizeof("params")) == 0) {
@@ -250,8 +268,6 @@ execute_command(std::string method_name, const tinyxml2::XMLElement* params_elem
       const auto* child = params_element->FirstChildElement("param");
 
       if (child != nullptr) {
-        std::function<void()> deleter = []() {};
-
         RpcManager::object_to_target(xml_value_to_object(child->FirstChildElement("value")), cmd_itr->second.m_flags, &target, &deleter);
         child = child->NextSiblingElement("param");
 
@@ -267,8 +283,6 @@ execute_command(std::string method_name, const tinyxml2::XMLElement* params_elem
       const auto* child = params_element->FirstChildElement("data")->FirstChildElement("value");
 
       if (child != nullptr) {
-        std::function<void()> deleter = []() {};
-
         RpcManager::object_to_target(xml_value_to_object(child), cmd_itr->second.m_flags, &target, &deleter);
         child = child->NextSiblingElement("value");
 
@@ -300,6 +314,9 @@ process_document(const tinyxml2::XMLDocument* doc, tinyxml2::XMLPrinter* printer
   if (doc->FirstChildElement("methodCall")->FirstChildElement("methodName") == nullptr)
     throw rpc_error(XMLRPC_PARSE_ERROR, "methodName element not found");
   auto            method_name = doc->FirstChildElement("methodCall")->FirstChildElement("methodName")->GetText();
+
+  if (method_name == nullptr)
+    throw rpc_error(XMLRPC_PARSE_ERROR, "methodName element is empty");
   torrent::Object result;
 
   // Add a shim here for system.multicall to allow better code reuse, and
@@ -310,6 +327,9 @@ process_document(const tinyxml2::XMLDocument* doc, tinyxml2::XMLPrinter* printer
     auto  parent_elements = element_access(doc->RootElement(), {"params", "param", "value", "array", "data"});
     for (auto child = parent_elements->FirstChildElement("value"); child; child = child->NextSiblingElement("value")) {
       auto sub_method_name = element_access(child, {"struct", "member", "value", "string"})->GetText();
+
+      if (sub_method_name == nullptr)
+        throw rpc_error(XMLRPC_PARSE_ERROR, "multicall methodName element is empty");
       // If sub_params ends up a nullptr at the end of this if-chian,
       // execute_command will turn it into an empty list
       auto sub_params = element_access(child, {"struct", "member"});
@@ -405,6 +425,14 @@ XmlRpc::process(const char* inBuffer, uint32_t length, slot_write slotWrite) {
     // remains.
     tinyxml2::XMLPrinter printer(nullptr, true, 0);
     process_document(&doc, &printer);
+
+    if (printer.CStrSize() - 1 > static_cast<int>(SCgiTask::max_response_size)) {
+      tinyxml2::XMLPrinter fault_printer(nullptr, true, 0);
+      print_xmlrpc_fault(XMLRPC_LIMIT_EXCEEDED_ERROR, "Response size exceeds maximum XML-RPC limit", &fault_printer);
+
+      return slotWrite(fault_printer.CStr(), fault_printer.CStrSize() - 1);
+    }
+
     return slotWrite(printer.CStr(), printer.CStrSize() - 1);
   } catch (rpc_error& e) {
     tinyxml2::XMLPrinter printer(nullptr, true, 0);

src/session/download_storer.cc

@@ -127,8 +127,12 @@ save_stream(const std::string& path, bool use_fsyncdisk, const std::stringstream
   if (!output.good())
     throw torrent::storage_error("failed to write stream to file : " + path);
 
+  // The data only reaches the kernel here, so this is where a full disk is seen.
   output.close();
 
+  if (!output.good())
+    throw torrent::storage_error("failed to flush stream to file : " + path);
+
   // Ensure that the new file is actually written to the disk
   int fd = ::open(path.c_str(), O_WRONLY);
 
@@ -137,13 +141,19 @@ save_stream(const std::string& path, bool use_fsyncdisk, const std::stringstream
 
   if (use_fsyncdisk) {
 #ifdef __APPLE__
-    ::fsync(fd);
+    int sync_result = ::fsync(fd);
 #else
-    ::fdatasync(fd);
+    int sync_result = ::fdatasync(fd);
 #endif
+
+    if (sync_result == -1) {
+      ::close(fd);
+      throw torrent::storage_error("failed to sync file to disk : " + path);
+    }
   }
 
-  ::close(fd);
+  if (::close(fd) == -1)
+    throw torrent::storage_error("failed to close file descriptor : " + path);
 }
 
 } // namespace anonymous

src/session/session_manager.h

@@ -126,7 +126,7 @@ private:
 
 inline bool        SessionManager::is_used() const            { return !m_path.empty(); }
 inline std::string SessionManager::path() const               { return m_path; }
-inline bool        SessionManager::use_fsyncdisk() const      { return true; }
+inline bool        SessionManager::use_fsyncdisk() const      { return m_use_fsyncdisk; }
 inline bool        SessionManager::use_lock() const           { return m_use_lock; }
 inline void        SessionManager::flush_all_pending_builds() { process_pending_builds(true); }
 

src/setup.cc

@@ -37,7 +37,7 @@ parse_main_options(int argc, char** argv) {
 
     optionParser.insert_option('b', [](auto& arg) { rpc::call_command_set_string("network.bind_address.set", arg); });
     optionParser.insert_option('d', [](auto& arg) { rpc::call_command_set_string("directory.default.set", arg); });
-    optionParser.insert_option('i', [](auto& arg) { rpc::call_command_set_string("ip", arg); });
+    optionParser.insert_option('i', [](auto& arg) { rpc::call_command_set_string("network.local_address.set", arg); });
     optionParser.insert_option('p', [](auto& arg) { rpc::call_command_set_string("network.listen.port.range.set", arg); });
     optionParser.insert_option('s', [](auto& arg) { rpc::call_command_set_string("session", arg); });
 
@@ -86,9 +86,13 @@ config_comment_log(const std::string& command, const std::string& raw_args) {
     pos = next_pos + 1;
   }
 
-  if (command == "log.add_output")
+  if (command == "log.add_output") {
+    if (args.size() != 2)
+      throw torrent::input_error("Invalid number of arguments.");
+
     log_add_group_output_str(args[0], args[1]);
-  else if (command == "log.open_file")
+
+  } else if (command == "log.open_file")
     apply_log_open_str(0, args);
   else if (command == "log.open_file.flush")
     apply_log_open_str(log_flag_flush, args);

src/setup.h

@@ -3,6 +3,7 @@
 
 #include <functional>
 #include <string>
+#include <vector>
 
 int  parse_main_options(int argc, char** argv);
 void parse_config_file(int argc, char** argv, std::function<void (const std::string&)> parse_fn);

src/ui/download.cc

@@ -1,3 +1,4 @@
+#include <memory>
 #include "config.h"
 
 #include <cassert>
@@ -30,8 +31,10 @@
 
 namespace ui {
 
-Download::Download(core::Download* d)
+Download::Download(const std::shared_ptr<core::Download>& download)
-  : m_download(d) {
+  : m_download(download.get()) {
+
+  auto* d = download.get();
 
   m_windowDownloadStatus = std::make_unique<WDownloadStatus>(d);
   m_windowDownloadStatus->set_bottom(true);

src/ui/download.h

@@ -2,6 +2,7 @@
 #define RTORRENT_UI_DOWNLOAD_H
 
 #include <list>
+#include <memory>
 #include <torrent/peer/peer.h>
 
 #include "display/manager.h"
@@ -36,7 +37,7 @@ public:
     DISPLAY_MAX_SIZE
   } Display;
 
-  Download(core::Download* d);
+  Download(const std::shared_ptr<core::Download>& d);
   ~Download();
 
   void                activate(display::Frame* frame, bool focus = true);

src/ui/download_list.cc

@@ -89,7 +89,7 @@ DownloadList::unfocus_download(core::Download* d) {
   if (m_state == DISPLAY_DOWNLOAD && d == static_cast<Download*>(m_uiArray[DISPLAY_DOWNLOAD])->download())
     activate_display(DISPLAY_DOWNLOAD_LIST);
 
-  if (*current_view()->focus() == d && current_view()->focus() < current_view()->end_visible())
+  if (current_view()->focus() < current_view()->end_visible() && current_view()->focus()->get() == d)
       current_view()->next_focus();
 }
 

src/ui/element_download_list.cc

@@ -196,7 +196,7 @@ ElementDownloadList::receive_cycle_throttle() {
   if (m_view->focus() == m_view->end_visible())
     return;
 
-  core::Download* download = *m_view->focus();
+  core::Download* download = m_view->focus()->get();
   if (download->is_active()) {
     lt_log_print(torrent::LOG_TORRENT_WARN, "Cannot change throttle on active download.");
     return;

src/ui/root.cc

@@ -4,6 +4,7 @@
 
 #include <fstream>
 #include <stdexcept>
+#include <string>
 #include <string.h>
 #include <torrent/throttle.h>
 #include <torrent/torrent.h>
@@ -354,8 +355,9 @@ Root::reset_input_history_attributes(ui::DownloadList::Input type) {
 
 void
 Root::set_input_history_size(int size) {
-  if (size < 1)
+  if (size < 1 || size > max_input_history_size)
-    throw torrent::input_error("Invalid input history size.");
+    throw torrent::input_error("Input history size must be between 1 and " +
+                               std::to_string(max_input_history_size) + ".");
 
   for (auto& [entry, category] : m_input_history) {
     // Reserve the latest input history entries if new size is smaller than original.
@@ -465,6 +467,9 @@ Root::save_input_history() {
         history_file << entry << "|" + category.at((pitr->second + i) % m_input_history_length) + "\n";
   }
 
+  // The data only reaches the kernel here, so this is where a full disk is seen.
+  history_file.close();
+
   if (!history_file.good()) {
     lt_log_print(torrent::LOG_DEBUG, "input history file corrupted during writing, discarding (path:%s)", history_filename.c_str());
     return;
@@ -472,8 +477,6 @@ Root::save_input_history() {
     lt_log_print(torrent::LOG_DEBUG, "input history file written (path:%s)", history_filename.c_str());
   }
 
-  history_file.close();
-
   std::rename(history_filename_tmp.c_str(), history_filename.c_str());
 }
 

src/ui/root.h

@@ -54,6 +54,8 @@ public:
   typedef std::vector<std::string> InputHistoryCategory;
   typedef std::map<int, InputHistoryCategory> InputHistory;
 
+  static constexpr int max_input_history_size = 4096;
+
   Root();
 
   void                init(Control* c);

src/utils/gzip.cc

@@ -5,6 +5,8 @@
 #include <zlib.h>
 #include <torrent/exceptions.h>
 
+#include "utils/functional.h"
+
 namespace utils {
 
 void
@@ -21,6 +23,8 @@ gzip_compress_to_vector(const char* buffer, unsigned int length, std::vector<cha
   if (deflateInit2(&zs, Z_DEFAULT_COMPRESSION, Z_DEFLATED, window_bits | gzip_encoding, gzip_level, Z_DEFAULT_STRATEGY) != Z_OK)
     throw torrent::internal_error("gzip_compress_to_vector(...) could not initialize gzip deflate.");
 
+  scope_guard guard([&zs]() { deflateEnd(&zs); });
+
   auto max_response_size = deflateBound(&zs, length);
 
   output.resize(offset + max_response_size);

src/utils/gzip.h

@@ -2,6 +2,7 @@
 #define RTORRENT_UTILS_GZIP_H
 
 #include <functional>
+#include <vector>
 
 namespace utils {
 

test/Makefile.am

@@ -1,4 +1,5 @@
 TESTS = \
+	rtorrent_Test_Core \
 	rtorrent_Test_Rpc \
 	rtorrent_Test_Src
 
@@ -7,6 +8,7 @@ check_PROGRAMS = $(TESTS)
 rtorrent_Test_LDADD = \
 	../src/libsub_root.a
 
+rtorrent_Test_Core_LDADD = $(rtorrent_Test_LDADD)
 rtorrent_Test_Rpc_LDADD = $(rtorrent_Test_LDADD)
 rtorrent_Test_Src_LDADD = $(rtorrent_Test_LDADD)
 
@@ -30,11 +32,17 @@ rtorrent_Test_Common = \
 	helpers/test_utils.h \
 	helpers/utils.h
 
+rtorrent_Test_Core_SOURCES = $(rtorrent_Test_Common) \
+	core/test_view.cc \
+	core/test_view.h
+
 rtorrent_Test_Rpc_SOURCES = $(rtorrent_Test_Common) \
 	rpc/test_command.cc \
 	rpc/test_command.h \
 	rpc/test_command_map.cc \
 	rpc/test_command_map.h \
+	rpc/test_command_scheduler.cc \
+	rpc/test_command_scheduler.h \
 	rpc/test_jsonrpc.cc \
 	rpc/test_jsonrpc.h \
 	rpc/test_xmlrpc.cc \
@@ -44,16 +52,28 @@ rtorrent_Test_Rpc_SOURCES = $(rtorrent_Test_Common) \
 	rpc/test_object_storage.cc \
 	rpc/test_object_storage.h \
 	rpc/test_parse_options.cc \
-	rpc/test_parse_options.h
+	rpc/test_parse_options.h \
+	rpc/test_rpc_manager.cc \
+	rpc/test_rpc_manager.h
 
 rtorrent_Test_Src_SOURCES = $(rtorrent_Test_Common) \
 	src/test_command_dynamic.cc \
 	src/test_command_dynamic.h \
-	src/test_command_local.cc \
+	src/test_command_ip.cc \
-	src/test_command_local.h \
+	src/test_command_ip.h \
+	src/test_command_system.cc \
+	src/test_command_system.h \
+	src/test_command_path.cc \
+	src/test_command_path.h \
+	src/test_command_string.cc \
+	src/test_command_string.h \
+	src/test_setup.cc \
+	src/test_setup.h \
 	src/test_watch_ready_queue.cc \
 	src/test_watch_ready_queue.h
 
+rtorrent_Test_Core_CXXFLAGS = $(CPPUNIT_CFLAGS)
+rtorrent_Test_Core_LDFLAGS = $(CPPUNIT_LIBS) -ldl
 rtorrent_Test_Rpc_CXXFLAGS = $(CPPUNIT_CFLAGS)
 rtorrent_Test_Rpc_LDFLAGS = $(CPPUNIT_LIBS) -ldl
 rtorrent_Test_Src_CXXFLAGS = $(CPPUNIT_CFLAGS)

test/core/test_view.cc

@@ -0,0 +1,158 @@
+#include "config.h"
+
+#include "test/core/test_view.h"
+
+#include <algorithm>
+#include <cstddef>
+#include <deque>
+#include <memory>
+#include <set>
+#include <string>
+#include <vector>
+
+#include "command_helpers.h"
+#include "control.h"
+#include "core/download.h"
+#include "core/view.h"
+#include "globals.h"
+#include "rpc/parse_commands.h"
+
+CPPUNIT_TEST_SUITE_REGISTRATION(TestView);
+
+namespace {
+
+const char* filter_command  = "test.view.filter";
+const char* added_command   = "test.view.event_added";
+const char* removed_command = "test.view.event_removed";
+
+// View only stores these and hands them to the command layer as RPC targets,
+// which casts the pointer without reading through it.
+struct download_stub {
+  alignas(core::Download) std::byte storage[sizeof(core::Download)];
+};
+
+std::deque<download_stub>    stub_storage;
+std::vector<core::Download*> stub_downloads;
+
+std::set<core::Download*>    matches_filter;
+std::vector<core::Download*> added_events;
+std::vector<core::Download*> removed_events;
+
+std::shared_ptr<core::Download>
+make_stub_download() {
+  auto download = reinterpret_cast<core::Download*>(&stub_storage.emplace_back());
+
+  stub_downloads.push_back(download);
+
+  return std::shared_ptr<core::Download>(download, [](core::Download*) {});
+}
+
+// Renders a dispatch list as "d0,d2" so a failure names the downloads the
+// handler saw, not just how many there were.
+std::string
+describe(const std::vector<core::Download*>& downloads) {
+  std::string result;
+
+  for (const auto& download : downloads) {
+    auto itr = std::find(stub_downloads.begin(), stub_downloads.end(), download);
+
+    if (!result.empty())
+      result += ',';
+
+    result += 'd' + std::to_string(std::distance(stub_downloads.begin(), itr));
+  }
+
+  return result;
+}
+
+torrent::Object
+cmd_filter(core::Download* download, const torrent::Object&) {
+  return torrent::Object(static_cast<int64_t>(matches_filter.count(download)));
+}
+
+torrent::Object
+cmd_event_added(core::Download* download, const torrent::Object&) {
+  added_events.push_back(download);
+  return torrent::Object();
+}
+
+torrent::Object
+cmd_event_removed(core::Download* download, const torrent::Object&) {
+  removed_events.push_back(download);
+  return torrent::Object();
+}
+
+torrent::Object
+command_object(const char* command) {
+  return torrent::Object(std::string(command) + "=");
+}
+
+} // namespace
+
+void
+TestView::setUp() {
+  TestFixtureWithMainThread::setUp();
+
+  if (control == nullptr)
+    control = new Control;
+
+  if (!rpc::commands.has(filter_command)) {
+    CMD2_DL(filter_command, &cmd_filter);
+    CMD2_DL(added_command, &cmd_event_added);
+    CMD2_DL(removed_command, &cmd_event_removed);
+  }
+
+  stub_storage.clear();
+  stub_downloads.clear();
+  matches_filter.clear();
+  added_events.clear();
+  removed_events.clear();
+}
+
+void
+TestView::tearDown() {
+  TestFixtureWithMainThread::tearDown();
+}
+
+// d0 and d1 start visible and stop matching, d2 and d3 start filtered out and
+// start matching. The two halves are the same size on purpose: a test that
+// only counted the dispatches would pass even if both events were sent over
+// the same half of the changed range.
+void
+TestView::test_filter_dispatches_events_to_the_right_downloads() {
+  core::View view;
+  view.initialize("test_view");
+
+  auto d0 = make_stub_download();
+  auto d1 = make_stub_download();
+  auto d2 = make_stub_download();
+  auto d3 = make_stub_download();
+
+  view.insert(d0);
+  view.insert(d1);
+  view.insert(d2);
+  view.insert(d3);
+
+  view.set_visible(d0.get());
+  view.set_visible(d1.get());
+
+  CPPUNIT_ASSERT_EQUAL(core::View::size_type(2), view.size_visible());
+
+  matches_filter = {d2.get(), d3.get()};
+
+  view.set_filter(command_object(filter_command));
+  view.set_event_added(command_object(added_command));
+  view.set_event_removed(command_object(removed_command));
+
+  added_events.clear();
+  removed_events.clear();
+
+  view.filter();
+
+  CPPUNIT_ASSERT_EQUAL(std::string("d2,d3"), describe(added_events));
+  CPPUNIT_ASSERT_EQUAL(std::string("d0,d1"), describe(removed_events));
+
+  CPPUNIT_ASSERT_EQUAL(core::View::size_type(2), view.size_visible());
+  CPPUNIT_ASSERT(*view.begin_visible() == d2);
+  CPPUNIT_ASSERT(*(view.begin_visible() + 1) == d3);
+}

test/core/test_view.h

@@ -0,0 +1,15 @@
+#include "test/helpers/test_main_thread.h"
+
+class TestView : public TestFixtureWithMainThread {
+  CPPUNIT_TEST_SUITE(TestView);
+
+  CPPUNIT_TEST(test_filter_dispatches_events_to_the_right_downloads);
+
+  CPPUNIT_TEST_SUITE_END();
+
+public:
+  void setUp();
+  void tearDown();
+
+  void test_filter_dispatches_events_to_the_right_downloads();
+};

test/rpc/test_command_scheduler.cc

@@ -0,0 +1,65 @@
+#include "config.h"
+
+#include "test/rpc/test_command_scheduler.h"
+
+#include <chrono>
+
+#include "rpc/command_scheduler.h"
+#include "rpc/command_scheduler_item.h"
+#include "torrent/object.h"
+
+CPPUNIT_TEST_SUITE_REGISTRATION(TestCommandScheduler);
+
+namespace {
+
+const torrent::Object test_command = torrent::Object(std::string("print=scheduled"));
+
+std::chrono::microseconds
+time_scheduled(rpc::CommandScheduler& scheduler, const std::string& key) {
+  auto itr = scheduler.find(key);
+
+  CPPUNIT_ASSERT(itr != scheduler.end());
+
+  return (*itr)->time_scheduled();
+}
+
+}
+
+void
+TestCommandScheduler::setUp() {
+  TestFixtureWithMainThread::setUp();
+
+  m_main_thread->test_set_cached_time(std::chrono::seconds(0));
+}
+
+void
+TestCommandScheduler::tearDown() {
+  TestFixtureWithMainThread::tearDown();
+}
+
+void
+TestCommandScheduler::test_parse_rearms_existing_key() {
+  rpc::CommandScheduler scheduler;
+
+  scheduler.parse("key", "3600", "3600", test_command);
+
+  auto first = time_scheduled(scheduler, "key");
+
+  m_main_thread->test_add_cached_time(std::chrono::seconds(600));
+  scheduler.parse("key", "3600", "3600", test_command);
+
+  CPPUNIT_ASSERT_EQUAL(size_t{1}, scheduler.size());
+  CPPUNIT_ASSERT(time_scheduled(scheduler, "key") == first + std::chrono::seconds(600));
+}
+
+void
+TestCommandScheduler::test_find_locates_a_scheduled_key() {
+  rpc::CommandScheduler scheduler;
+
+  CPPUNIT_ASSERT(scheduler.find("key") == scheduler.end());
+
+  scheduler.parse("key", "3600", "3600", test_command);
+
+  CPPUNIT_ASSERT(scheduler.find("key") != scheduler.end());
+  CPPUNIT_ASSERT(scheduler.find("other") == scheduler.end());
+}

test/rpc/test_command_scheduler.h

@@ -0,0 +1,17 @@
+#include "test/helpers/test_main_thread.h"
+
+class TestCommandScheduler : public TestFixtureWithMainThread {
+  CPPUNIT_TEST_SUITE(TestCommandScheduler);
+
+  CPPUNIT_TEST(test_parse_rearms_existing_key);
+  CPPUNIT_TEST(test_find_locates_a_scheduled_key);
+
+  CPPUNIT_TEST_SUITE_END();
+
+public:
+  void setUp();
+  void tearDown();
+
+  void test_parse_rearms_existing_key();
+  void test_find_locates_a_scheduled_key();
+};

test/rpc/test_jsonrpc.cc

@@ -8,12 +8,18 @@
 #include "globals.h"
 #include "command_helpers.h"
 #include "rpc/command_map.h"
+#include "rpc/scgi_task.h"
 
 CPPUNIT_TEST_SUITE_REGISTRATION(TestJsonrpc);
 
 torrent::Object
 jsonrpc_cmd_test_reflect([[maybe_unused]] rpc::target_type t, const torrent::Object& obj) { return obj; }
 
+torrent::Object
+jsonrpc_cmd_test_oversized([[maybe_unused]] rpc::target_type t, [[maybe_unused]] const torrent::Object& obj) {
+  return torrent::Object(std::string(rpc::SCgiTask::max_response_size + (1 << 20), 'a'));
+}
+
 void initialize_command_dynamic();
 
 // Name, Request, Expected response
@@ -130,6 +136,10 @@ TestJsonrpc::setUp() {
   if (rpc::commands.find("jsonrpc_reflect") == rpc::commands.end()) {
     CMD2_ANY("jsonrpc_reflect", &jsonrpc_cmd_test_reflect);
   }
+
+  if (rpc::commands.find("jsonrpc_oversized") == rpc::commands.end()) {
+    CMD2_ANY("jsonrpc_oversized", &jsonrpc_cmd_test_oversized);
+  }
 }
 
 void
@@ -145,3 +155,21 @@ TestJsonrpc::test_basics() {
     CPPUNIT_ASSERT_EQUAL_MESSAGE(std::get<0>(test), std::get<2>(test), output);
   }
 }
+
+// A command whose result does not fit in the SCGI response buffer must be
+// answered with a fault, not handed to the writer. SCgiTask::receive_write
+// treats an oversized body as an internal_error, which is not caught by any
+// RPC handler and terminates the process.
+void
+TestJsonrpc::test_response_size_limit() {
+  const std::string request = R"({"jsonrpc": "2.0", "method": "jsonrpc_oversized", "params": [""], "id": 1})";
+  const std::string expected = R"({"error":{"code":-32000,"message":"response size exceeds maximum RPC limit"},"id":1,"jsonrpc":"2.0"})";
+
+  std::string output;
+  m_jsonrpc.process(request.c_str(), request.size(), [&output](const char* c, uint32_t l) { output.append(c, l); return true; });
+
+  CPPUNIT_ASSERT_MESSAGE("response handed to the writer is " + std::to_string(output.size()) +
+                         " bytes, over the " + std::to_string(rpc::SCgiTask::max_response_size) + " byte SCGI limit",
+                         output.size() <= rpc::SCgiTask::max_response_size);
+  CPPUNIT_ASSERT_EQUAL(expected, output);
+}

test/rpc/test_jsonrpc.h

@@ -8,6 +8,7 @@ class TestJsonrpc : public test_fixture {
   CPPUNIT_TEST_SUITE(TestJsonrpc);
 
   CPPUNIT_TEST(test_basics);
+  CPPUNIT_TEST(test_response_size_limit);
 
   CPPUNIT_TEST_SUITE_END();
 
@@ -16,6 +17,7 @@ public:
   void tearDown();
 
   void test_basics();
+  void test_response_size_limit();
 
 private:
   std::unique_ptr<TestMainThread> m_test_main_thread;

test/rpc/test_object_storage.cc

@@ -49,6 +49,17 @@ TestObjectStorage::test_validate_keys() {
   torrent::raw_string raw_string_4("test_4\0foo", 10);
 
   ASSERT_CATCH_INPUT_ERROR( { m_storage.insert(raw_string_4, torrent::Object("a"), rpc::object_storage::flag_string_type); } );
+  ASSERT_CATCH_INPUT_ERROR( { m_storage.insert_str("", torrent::Object("a"), rpc::object_storage::flag_string_type); } );
+
+  std::string key_max(rpc::object_storage::key_size - 1, 'k');
+
+  CPPUNIT_ASSERT(m_storage.insert_str(key_max, torrent::Object("a"), rpc::object_storage::flag_string_type)->first == key_max);
+  ASSERT_CATCH_INPUT_ERROR( { m_storage.insert_str(key_max + 'k', torrent::Object("a"), rpc::object_storage::flag_string_type); } );
+
+  // The over-long key must not have been stored as the empty key.
+  CPPUNIT_ASSERT(m_storage.find_raw_string(torrent::raw_string::from_c_str("")) == m_storage.end());
+
+  m_storage.clear();
 }
 
 // And test many other bad/good string combos.

test/rpc/test_rpc_manager.cc

@@ -0,0 +1,21 @@
+#include "config.h"
+
+#include "test/rpc/test_rpc_manager.h"
+
+#include <torrent/exceptions.h>
+
+#include "rpc/scgi_task.h"
+
+CPPUNIT_TEST_SUITE_REGISTRATION(TestRpcManager);
+
+// A size limit too small to hold any request rejects every request, including
+// the one that would put it back, so it can only be undone by a restart.
+void
+TestRpcManager::test_size_limit_bounds() {
+  CPPUNIT_ASSERT_THROW(m_rpc_manager.set_size_limit(0), torrent::input_error);
+  CPPUNIT_ASSERT_THROW(m_rpc_manager.set_size_limit(rpc::RpcManager::min_size_limit - 1), torrent::input_error);
+  CPPUNIT_ASSERT_THROW(m_rpc_manager.set_size_limit(rpc::SCgiTask::max_content_size + 1), torrent::input_error);
+
+  CPPUNIT_ASSERT_NO_THROW(m_rpc_manager.set_size_limit(rpc::RpcManager::min_size_limit));
+  CPPUNIT_ASSERT_NO_THROW(m_rpc_manager.set_size_limit(rpc::SCgiTask::max_content_size));
+}

test/rpc/test_rpc_manager.h

@@ -0,0 +1,17 @@
+#include "test/helpers/test_fixture.h"
+
+#include "rpc/rpc_manager.h"
+
+class TestRpcManager : public test_fixture {
+  CPPUNIT_TEST_SUITE(TestRpcManager);
+
+  CPPUNIT_TEST(test_size_limit_bounds);
+
+  CPPUNIT_TEST_SUITE_END();
+
+public:
+  void test_size_limit_bounds();
+
+private:
+  rpc::RpcManager m_rpc_manager;
+};

test/rpc/test_xmlrpc.cc

@@ -8,6 +8,7 @@
 #include "globals.h"
 #include "command_helpers.h"
 #include "rpc/command_map.h"
+#include "rpc/scgi_task.h"
 
 CPPUNIT_TEST_SUITE_REGISTRATION(TestXmlrpc);
 
@@ -21,6 +22,11 @@ xmlrpc_cmd_test_reflect_string([[maybe_unused]] rpc::target_type t, const std::s
   return obj;
 }
 
+torrent::Object
+xmlrpc_cmd_test_oversized([[maybe_unused]] rpc::target_type t, [[maybe_unused]] const torrent::Object& obj) {
+  return torrent::Object(std::string(rpc::SCgiTask::max_response_size + (1 << 20), 'a'));
+}
+
 void initialize_command_dynamic();
 
 #if defined(HAVE_XMLRPC_TINYXML2) && !defined(HAVE_XMLRPC_C)
@@ -127,6 +133,9 @@ TestXmlrpc::setUp() {
 
   if (rpc::commands.find("xmlrpc_reflect_string") == rpc::commands.end())
     CMD2_ANY_STRING("xmlrpc_reflect_string", &xmlrpc_cmd_test_reflect_string);
+
+  if (rpc::commands.find("xmlrpc_oversized") == rpc::commands.end())
+    CMD2_ANY("xmlrpc_oversized", &xmlrpc_cmd_test_oversized);
 }
 
 void
@@ -165,11 +174,30 @@ TestXmlrpc::test_size_limit() {
   CPPUNIT_ASSERT_EQUAL(expected, output);
 }
 
+// A command whose result does not fit in the SCGI response buffer must be
+// answered with a fault, not handed to the writer. SCgiTask::receive_write
+// treats an oversized body as an internal_error, which is not caught by any
+// RPC handler and terminates the process.
+void
+TestXmlrpc::test_response_size_limit() {
+  std::string input = "<?xml version=\"1.0\"?><methodCall><methodName>xmlrpc_oversized</methodName><params><param><value><string></string></value></param></params></methodCall>";
+  std::string expected = "<?xml version=\"1.0\"?><methodResponse><fault><value><struct><member><name>faultCode</name><value><i8>-509</i8></value></member><member><name>faultString</name><value><string>Response size exceeds maximum XML-RPC limit</string></value></member></struct></value></fault></methodResponse>";
+  std::string output;
+
+  m_xmlrpc.process(input.c_str(), input.size(), [&output](const char* c, uint32_t l){ output.append(c, l); return true;});
+
+  CPPUNIT_ASSERT_MESSAGE("response handed to the writer is " + std::to_string(output.size()) +
+                         " bytes, over the " + std::to_string(rpc::SCgiTask::max_response_size) + " byte SCGI limit",
+                         output.size() <= rpc::SCgiTask::max_response_size);
+  CPPUNIT_ASSERT_EQUAL(expected, output);
+}
+
 #else
 
 void TestXmlrpc::test_invalid_utf8() {}
 void TestXmlrpc::test_basics() {}
 void TestXmlrpc::test_size_limit() {}
+void TestXmlrpc::test_response_size_limit() {}
 void TestXmlrpc::setUp() {}
 void TestXmlrpc::tearDown() {}
 

test/rpc/test_xmlrpc.h

@@ -10,6 +10,7 @@ class TestXmlrpc : public test_fixture {
   CPPUNIT_TEST(test_basics);
   CPPUNIT_TEST(test_invalid_utf8);
   CPPUNIT_TEST(test_size_limit);
+  CPPUNIT_TEST(test_response_size_limit);
 
   CPPUNIT_TEST_SUITE_END();
 
@@ -22,6 +23,7 @@ public:
   void test_basics();
   void test_invalid_utf8();
   void test_size_limit();
+  void test_response_size_limit();
 
 private:
   std::unique_ptr<TestMainThread> m_test_main_thread;

test/src/test_command_dynamic.cc

@@ -2,6 +2,8 @@
 
 #include "test/src/test_command_dynamic.h"
 
+#include "helpers/assert.h"
+
 #include "control.h"
 #include "globals.h"
 #include "rpc/parse_commands.h"
@@ -61,3 +63,51 @@ TestCommandDynamic::test_old_style() {
   rpc::commands.call_command("method.insert", rpc::create_object_list("test_old_style.4", "simple", "cat=test.3"));
   CPPUNIT_ASSERT(rpc::commands.call_command("test_old_style.4", torrent::Object()).as_string() == "test.3");
 }
+
+void
+TestCommandDynamic::test_insert_list() {
+  torrent::Object key_only = torrent::Object::create_list();
+  key_only.as_list().push_back("test_insert_list.1");
+
+  rpc::commands.call_command("method.insert.list", key_only);
+
+  torrent::Object result = rpc::commands.call_command("test_insert_list.1", torrent::Object());
+
+  CPPUNIT_ASSERT(result.is_list());
+  CPPUNIT_ASSERT(result.as_list().empty());
+
+  rpc::commands.call_command("method.insert.list",
+                             rpc::create_object_list("test_insert_list.2", rpc::create_object_list("a", "b")));
+
+  torrent::Object filled = rpc::commands.call_command("test_insert_list.2", torrent::Object());
+
+  CPPUNIT_ASSERT(filled.is_list());
+  CPPUNIT_ASSERT_EQUAL((size_t)2, filled.as_list().size());
+}
+
+void
+TestCommandDynamic::test_value_base() {
+  auto value = [](std::initializer_list<torrent::Object> objects) {
+    auto args = torrent::Object::create_list();
+
+    for (const auto& object : objects)
+      args.as_list().push_back(object);
+
+    return rpc::commands.call_command("value", args).as_value();
+  };
+
+  CPPUNIT_ASSERT_EQUAL(int64_t(10), value({"10"}));
+  CPPUNIT_ASSERT_EQUAL(int64_t(255), value({"ff", int64_t(16)}));
+
+  // strtoll only defines base 0 and base 2 through 36.
+  ASSERT_CATCH_INPUT_ERROR( { value({"10", int64_t(1)}); } );
+  ASSERT_CATCH_INPUT_ERROR( { value({"10", int64_t(37)}); } );
+  ASSERT_CATCH_INPUT_ERROR( { value({"10", int64_t(-1)}); } );
+
+  // An out-of-range base must not be narrowed into a valid one.
+  ASSERT_CATCH_INPUT_ERROR( { value({"10", int64_t(1) << 40}); } );
+  ASSERT_CATCH_INPUT_ERROR( { value({"ff", (int64_t(1) << 32) + 16}); } );
+
+  // A number too large for the result must be rejected, not clamped.
+  ASSERT_CATCH_INPUT_ERROR( { value({"99999999999999999999999"}); } );
+}

test/src/test_command_dynamic.h

@@ -7,6 +7,8 @@ class TestCommandDynamic : public test_fixture {
   CPPUNIT_TEST(test_basics);
   CPPUNIT_TEST(test_get_set);
   CPPUNIT_TEST(test_old_style);
+  CPPUNIT_TEST(test_insert_list);
+  CPPUNIT_TEST(test_value_base);
 
   CPPUNIT_TEST_SUITE_END();
 
@@ -18,6 +20,8 @@ public:
   void test_get_set();
 
   void test_old_style();
+  void test_insert_list();
+  void test_value_base();
 
 private:
   std::unique_ptr<TestMainThread> m_test_main_thread;

test/src/test_command_ip.cc

@@ -0,0 +1,55 @@
+#include "config.h"
+
+#include "test/src/test_command_ip.h"
+
+#include <cstdint>
+
+CPPUNIT_TEST_SUITE_REGISTRATION(TestCommandIp);
+
+bool ipv4_range_parse(const char* address, uint32_t* address_start, uint32_t* address_end);
+
+static uint32_t
+ipv4(uint32_t a, uint32_t b, uint32_t c, uint32_t d) {
+  return (a << 24) | (b << 16) | (c << 8) | d;
+}
+
+#define RANGE_ASSERT(address, expected_start, expected_end)             \
+  {                                                                     \
+    uint32_t start = 0;                                                 \
+    uint32_t end = 0;                                                   \
+                                                                        \
+    CPPUNIT_ASSERT(ipv4_range_parse(address, &start, &end));            \
+    CPPUNIT_ASSERT_EQUAL(expected_start, start);                        \
+    CPPUNIT_ASSERT_EQUAL(expected_end, end);                            \
+  }
+
+void
+TestCommandIp::test_single_address() {
+  RANGE_ASSERT("10.1.2.3", ipv4(10, 1, 2, 3), ipv4(10, 1, 2, 3));
+}
+
+void
+TestCommandIp::test_explicit_range() {
+  RANGE_ASSERT("10.1.2.3-10.1.2.9", ipv4(10, 1, 2, 3), ipv4(10, 1, 2, 9));
+}
+
+void
+TestCommandIp::test_cidr() {
+  RANGE_ASSERT("10.0.0.0/8", ipv4(10, 0, 0, 0), ipv4(10, 255, 255, 255));
+  RANGE_ASSERT("10.1.2.0/24", ipv4(10, 1, 2, 0), ipv4(10, 1, 2, 255));
+  RANGE_ASSERT("10.1.2.128/25", ipv4(10, 1, 2, 128), ipv4(10, 1, 2, 255));
+  RANGE_ASSERT("10.1.2.3/31", ipv4(10, 1, 2, 2), ipv4(10, 1, 2, 3));
+}
+
+void
+TestCommandIp::test_cidr_zero_mask() {
+  RANGE_ASSERT("0.0.0.0/0", ipv4(0, 0, 0, 0), ipv4(255, 255, 255, 255));
+  RANGE_ASSERT("10.1.2.3/0", ipv4(0, 0, 0, 0), ipv4(255, 255, 255, 255));
+}
+
+void
+TestCommandIp::test_cidr_full_mask() {
+  RANGE_ASSERT("10.1.2.3/32", ipv4(10, 1, 2, 3), ipv4(10, 1, 2, 3));
+  RANGE_ASSERT("0.0.0.0/32", ipv4(0, 0, 0, 0), ipv4(0, 0, 0, 0));
+  RANGE_ASSERT("255.255.255.255/32", ipv4(255, 255, 255, 255), ipv4(255, 255, 255, 255));
+}

test/src/test_command_ip.h

@@ -0,0 +1,25 @@
+#include <cppunit/TestFixture.h>
+#include <cppunit/extensions/HelperMacros.h>
+
+// ipv4_range_parse is a pure function, so this does not use test_fixture and
+// the mock and logging setup that comes with it.
+class TestCommandIp : public CppUnit::TestFixture {
+  CPPUNIT_TEST_SUITE(TestCommandIp);
+
+  CPPUNIT_TEST(test_single_address);
+  CPPUNIT_TEST(test_explicit_range);
+
+  CPPUNIT_TEST(test_cidr);
+  CPPUNIT_TEST(test_cidr_zero_mask);
+  CPPUNIT_TEST(test_cidr_full_mask);
+
+  CPPUNIT_TEST_SUITE_END();
+
+public:
+  void test_single_address();
+  void test_explicit_range();
+
+  void test_cidr();
+  void test_cidr_zero_mask();
+  void test_cidr_full_mask();
+};

test/src/test_command_path.cc

@@ -0,0 +1,116 @@
+#include "config.h"
+
+#include "test/src/test_command_path.h"
+
+#include <cstdlib>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <torrent/exceptions.h>
+#include <torrent/torrent.h>
+
+#include "control.h"
+#include "globals.h"
+#include "rpc/parse_commands.h"
+
+CPPUNIT_TEST_SUITE_REGISTRATION(TestCommandPath);
+
+void initialize_command_local();
+
+void
+TestCommandPath::setUp() {
+  char temp_dir[] = "/tmp/rtorrent_test_path_XXXXXX";
+
+  CPPUNIT_ASSERT(mkdtemp(temp_dir) != nullptr);
+
+  // The temporary directory itself may sit behind a symlink, as /tmp does on
+  // macOS, so resolve it up front to keep the expected values exact.
+  m_temp_dir = resolve_path(temp_dir);
+
+  CPPUNIT_ASSERT(!m_temp_dir.empty());
+  CPPUNIT_ASSERT_EQUAL(0, mkdir((m_temp_dir + "/data").c_str(), 0755));
+  CPPUNIT_ASSERT_EQUAL(0, symlink((m_temp_dir + "/data").c_str(), (m_temp_dir + "/link").c_str()));
+}
+
+void
+TestCommandPath::tearDown() {
+  unlink((m_temp_dir + "/link").c_str());
+  rmdir((m_temp_dir + "/data").c_str());
+  rmdir(m_temp_dir.c_str());
+}
+
+void
+TestCommandPath::test_resolves_symlink() {
+  CPPUNIT_ASSERT_EQUAL(m_temp_dir + "/data", resolve_path(m_temp_dir + "/link"));
+
+  // A path that lies below a symlinked directory is resolved as well.
+  CPPUNIT_ASSERT_EQUAL(0, mkdir((m_temp_dir + "/data/below").c_str(), 0755));
+  CPPUNIT_ASSERT_EQUAL(m_temp_dir + "/data/below", resolve_path(m_temp_dir + "/link/below"));
+  rmdir((m_temp_dir + "/data/below").c_str());
+}
+
+void
+TestCommandPath::test_removes_relative_components() {
+  CPPUNIT_ASSERT_EQUAL(m_temp_dir, resolve_path(m_temp_dir + "/data/.."));
+  CPPUNIT_ASSERT_EQUAL(m_temp_dir + "/data", resolve_path(m_temp_dir + "/./data"));
+  CPPUNIT_ASSERT_EQUAL(m_temp_dir + "/data", resolve_path(m_temp_dir + "/data/"));
+
+  // Trailing slashes and duplicated separators collapse.
+  CPPUNIT_ASSERT_EQUAL(m_temp_dir + "/data", resolve_path(m_temp_dir + "//data//"));
+}
+
+void
+TestCommandPath::test_expands_tilde() {
+  const char* home = std::getenv("HOME");
+
+  if (home == nullptr || *home == '\0')
+    return;
+
+  CPPUNIT_ASSERT_EQUAL(resolve_path(home), resolve_path("~"));
+  CPPUNIT_ASSERT_THROW(resolve_path("~root/somewhere"), torrent::input_error);
+}
+
+void
+TestCommandPath::test_missing_path_throws() {
+  CPPUNIT_ASSERT_THROW(resolve_path_or_throw(""), torrent::input_error);
+  CPPUNIT_ASSERT_THROW(resolve_path_or_throw(m_temp_dir + "/does_not_exist"), torrent::input_error);
+  CPPUNIT_ASSERT_EQUAL(m_temp_dir + "/data", resolve_path_or_throw(m_temp_dir + "/link"));
+}
+
+void
+TestCommandPath::test_missing_path_is_empty() {
+  CPPUNIT_ASSERT_EQUAL(std::string(), resolve_path(""));
+  CPPUNIT_ASSERT_EQUAL(std::string(), resolve_path(m_temp_dir + "/does_not_exist"));
+  CPPUNIT_ASSERT_EQUAL(std::string(), resolve_path(m_temp_dir + "/does_not_exist/below"));
+
+  // A dangling symlink does not name an existing path either.
+  CPPUNIT_ASSERT_EQUAL(0, symlink((m_temp_dir + "/gone").c_str(), (m_temp_dir + "/dangling").c_str()));
+  CPPUNIT_ASSERT_EQUAL(std::string(), resolve_path(m_temp_dir + "/dangling"));
+  unlink((m_temp_dir + "/dangling").c_str());
+}
+
+void
+TestCommandPath::test_commands() {
+  torrent::initialize_main_thread();
+  torrent::initialize();
+
+  if (control == nullptr)
+    control = new Control;
+
+  if (!rpc::commands.has("directory.default.realpath.or_empty"))
+    initialize_command_local();
+
+  rpc::commands.call_command("directory.default.set", m_temp_dir + "/link");
+
+  CPPUNIT_ASSERT_EQUAL(m_temp_dir + "/link", rpc::commands.call_command("directory.default", torrent::Object()).as_string());
+  CPPUNIT_ASSERT_EQUAL(m_temp_dir + "/data", rpc::commands.call_command("directory.default.realpath.or_empty", torrent::Object()).as_string());
+  CPPUNIT_ASSERT_EQUAL(m_temp_dir + "/data", rpc::commands.call_command("directory.default.realpath.or_throw", torrent::Object()).as_string());
+
+  // A directory that has not been created yet resolves to nothing, and the
+  // or_throw variant reports it instead.
+  rpc::commands.call_command("directory.default.set", m_temp_dir + "/missing");
+
+  CPPUNIT_ASSERT_EQUAL(std::string(), rpc::commands.call_command("directory.default.realpath.or_empty", torrent::Object()).as_string());
+  CPPUNIT_ASSERT_THROW(rpc::commands.call_command("directory.default.realpath.or_throw", torrent::Object()), torrent::input_error);
+
+  torrent::cleanup();
+}

test/src/test_command_path.h

@@ -0,0 +1,30 @@
+#include "test/helpers/test_fixture.h"
+
+#include <string>
+
+class TestCommandPath : public test_fixture {
+  CPPUNIT_TEST_SUITE(TestCommandPath);
+
+  CPPUNIT_TEST(test_resolves_symlink);
+  CPPUNIT_TEST(test_removes_relative_components);
+  CPPUNIT_TEST(test_expands_tilde);
+  CPPUNIT_TEST(test_missing_path_is_empty);
+  CPPUNIT_TEST(test_missing_path_throws);
+  CPPUNIT_TEST(test_commands);
+
+  CPPUNIT_TEST_SUITE_END();
+
+public:
+  void setUp();
+  void tearDown();
+
+  void test_resolves_symlink();
+  void test_removes_relative_components();
+  void test_expands_tilde();
+  void test_missing_path_is_empty();
+  void test_missing_path_throws();
+  void test_commands();
+
+private:
+  std::string m_temp_dir;
+};

test/src/test_command_string.cc

@@ -0,0 +1,261 @@
+#include "config.h"
+
+#include "test/src/test_command_string.h"
+
+#include "rpc/parse_commands.h"
+
+CPPUNIT_TEST_SUITE_REGISTRATION(TestCommandString);
+
+void initialize_command_string();
+
+namespace {
+
+torrent::Object
+args(std::initializer_list<torrent::Object> objects) {
+  auto result = torrent::Object::create_list();
+
+  for (const auto& object : objects)
+    result.as_list().push_back(object);
+
+  return result;
+}
+
+std::string
+call_string(const char* key, std::initializer_list<torrent::Object> objects) {
+  return rpc::commands.call_command(key, args(objects)).as_string();
+}
+
+int64_t
+call_value(const char* key, std::initializer_list<torrent::Object> objects) {
+  return rpc::commands.call_command(key, args(objects)).as_value();
+}
+
+torrent::Object::list_type
+call_list(const char* key, std::initializer_list<torrent::Object> objects) {
+  return rpc::commands.call_command(key, args(objects)).as_list();
+}
+
+// Runs a command the way a line in the configuration file would.
+torrent::Object
+parse(const char* command) {
+  return rpc::parse_command_single(rpc::make_target(), command);
+}
+
+}
+
+void
+TestCommandString::setUp() {
+  if (!rpc::commands.has("string.length"))
+    initialize_command_string();
+}
+
+void
+TestCommandString::tearDown() {
+}
+
+void
+TestCommandString::test_length() {
+  CPPUNIT_ASSERT_EQUAL(int64_t(0), call_value("string.length", {""}));
+  CPPUNIT_ASSERT_EQUAL(int64_t(3), call_value("string.length", {"abc"}));
+
+  // The length is counted in utf-8 characters, not bytes.
+  CPPUNIT_ASSERT_EQUAL(int64_t(5), call_value("string.length", {"héllo"}));
+  CPPUNIT_ASSERT_EQUAL(int64_t(3), call_value("string.length", {"日本語"}));
+
+  // Values are converted to their string representation.
+  CPPUNIT_ASSERT_EQUAL(int64_t(4), call_value("string.length", {int64_t(1234)}));
+}
+
+void
+TestCommandString::test_equals() {
+  CPPUNIT_ASSERT_EQUAL(int64_t(1), call_value("string.equals", {"abc", "abc"}));
+  CPPUNIT_ASSERT_EQUAL(int64_t(0), call_value("string.equals", {"abc", "abd"}));
+  CPPUNIT_ASSERT_EQUAL(int64_t(0), call_value("string.equals", {"abc", "ab"}));
+
+  CPPUNIT_ASSERT_EQUAL(int64_t(1), call_value("string.equals", {"abc", "x", "abc"}));
+  CPPUNIT_ASSERT_EQUAL(int64_t(0), call_value("string.equals", {"abc", "x", "y"}));
+
+  CPPUNIT_ASSERT_EQUAL(int64_t(1), call_value("string.equals", {int64_t(42), "42"}));
+}
+
+void
+TestCommandString::test_starts_with() {
+  CPPUNIT_ASSERT_EQUAL(int64_t(1), call_value("string.starts_with", {"abcdef", "abc"}));
+  CPPUNIT_ASSERT_EQUAL(int64_t(1), call_value("string.starts_with", {"abcdef", ""}));
+  CPPUNIT_ASSERT_EQUAL(int64_t(0), call_value("string.starts_with", {"abcdef", "bcd"}));
+  CPPUNIT_ASSERT_EQUAL(int64_t(0), call_value("string.starts_with", {"ab", "abc"}));
+
+  CPPUNIT_ASSERT_EQUAL(int64_t(1), call_value("string.starts_with", {"abcdef", "x", "ab"}));
+}
+
+void
+TestCommandString::test_ends_with() {
+  CPPUNIT_ASSERT_EQUAL(int64_t(1), call_value("string.ends_with", {"abcdef", "def"}));
+  CPPUNIT_ASSERT_EQUAL(int64_t(1), call_value("string.ends_with", {"abcdef", ""}));
+  CPPUNIT_ASSERT_EQUAL(int64_t(0), call_value("string.ends_with", {"abcdef", "cde"}));
+  CPPUNIT_ASSERT_EQUAL(int64_t(0), call_value("string.ends_with", {"ef", "def"}));
+
+  CPPUNIT_ASSERT_EQUAL(int64_t(1), call_value("string.ends_with", {"a.torrent", ".rar", ".torrent"}));
+}
+
+void
+TestCommandString::test_contains() {
+  CPPUNIT_ASSERT_EQUAL(int64_t(1), call_value("string.contains", {"abcdef", "cde"}));
+  CPPUNIT_ASSERT_EQUAL(int64_t(0), call_value("string.contains", {"abcdef", "ace"}));
+  CPPUNIT_ASSERT_EQUAL(int64_t(1), call_value("string.contains", {"abcdef", "x", "bcd"}));
+
+  CPPUNIT_ASSERT_EQUAL(int64_t(0), call_value("string.contains", {"retracker.local", "RETRACKER"}));
+  CPPUNIT_ASSERT_EQUAL(int64_t(1), call_value("string.contains_i", {"retracker.local", "RETRACKER"}));
+  CPPUNIT_ASSERT_EQUAL(int64_t(1), call_value("string.contains_i", {"RETRACKER.LOCAL", "retracker"}));
+  CPPUNIT_ASSERT_EQUAL(int64_t(0), call_value("string.contains_i", {"abcdef", "xyz"}));
+}
+
+void
+TestCommandString::test_substr() {
+  CPPUNIT_ASSERT_EQUAL(std::string("abcdef"), call_string("string.substr", {"abcdef"}));
+  CPPUNIT_ASSERT_EQUAL(std::string("cdef"), call_string("string.substr", {"abcdef", int64_t(2)}));
+  CPPUNIT_ASSERT_EQUAL(std::string("cde"), call_string("string.substr", {"abcdef", int64_t(2), int64_t(3)}));
+  CPPUNIT_ASSERT_EQUAL(std::string("cdef"), call_string("string.substr", {"abcdef", int64_t(2), int64_t(100)}));
+  CPPUNIT_ASSERT_EQUAL(std::string(""), call_string("string.substr", {"abcdef", int64_t(2), int64_t(0)}));
+
+  // Negative positions are relative to the end of the string.
+  CPPUNIT_ASSERT_EQUAL(std::string("ef"), call_string("string.substr", {"abcdef", int64_t(-2)}));
+  CPPUNIT_ASSERT_EQUAL(std::string("e"), call_string("string.substr", {"abcdef", int64_t(-2), int64_t(1)}));
+
+  // Out-of-bounds positions return the default value.
+  CPPUNIT_ASSERT_EQUAL(std::string(""), call_string("string.substr", {"abcdef", int64_t(10)}));
+  CPPUNIT_ASSERT_EQUAL(std::string("n/a"), call_string("string.substr", {"abcdef", int64_t(10), int64_t(1), "n/a"}));
+  CPPUNIT_ASSERT_EQUAL(std::string("n/a"), call_string("string.substr", {"abcdef", int64_t(-10), int64_t(1), "n/a"}));
+
+  // Positions and counts are in utf-8 characters, not bytes.
+  CPPUNIT_ASSERT_EQUAL(std::string("本"), call_string("string.substr", {"日本語", int64_t(1), int64_t(1)}));
+  CPPUNIT_ASSERT_EQUAL(std::string("本語"), call_string("string.substr", {"日本語", int64_t(-2)}));
+}
+
+void
+TestCommandString::test_split() {
+  auto parts = call_list("string.split", {"a,b,c", ","});
+
+  CPPUNIT_ASSERT_EQUAL(size_t(3), parts.size());
+  CPPUNIT_ASSERT_EQUAL(std::string("a"), parts.front().as_string());
+  CPPUNIT_ASSERT_EQUAL(std::string("c"), parts.back().as_string());
+
+  // Empty fields are preserved.
+  CPPUNIT_ASSERT_EQUAL(size_t(3), call_list("string.split", {"a,,b", ","}).size());
+  CPPUNIT_ASSERT_EQUAL(size_t(1), call_list("string.split", {"abc", ","}).size());
+
+  // A multi-character delimiter is matched as a whole.
+  CPPUNIT_ASSERT_EQUAL(size_t(2), call_list("string.split", {"a::b", "::"}).size());
+
+  // An empty delimiter splits the text into its utf-8 characters.
+  auto characters = call_list("string.split", {"日本語", ""});
+
+  CPPUNIT_ASSERT_EQUAL(size_t(3), characters.size());
+  CPPUNIT_ASSERT_EQUAL(std::string("日"), characters.front().as_string());
+}
+
+void
+TestCommandString::test_join() {
+  CPPUNIT_ASSERT_EQUAL(std::string("a, b"), call_string("string.join", {", ", "a", "b"}));
+  CPPUNIT_ASSERT_EQUAL(std::string("ab"), call_string("string.join", {"", "a", "b"}));
+  CPPUNIT_ASSERT_EQUAL(std::string(""), call_string("string.join", {", "}));
+  CPPUNIT_ASSERT_EQUAL(std::string("a"), call_string("string.join", {", ", "a"}));
+  CPPUNIT_ASSERT_EQUAL(std::string("1-2"), call_string("string.join", {"-", int64_t(1), int64_t(2)}));
+
+  // Lists are flattened, so the output of string.split can be joined again.
+  CPPUNIT_ASSERT_EQUAL(std::string("a-b-c"), call_string("string.join", {"-", args({"a", "b"}), "c"}));
+}
+
+void
+TestCommandString::test_pad() {
+  CPPUNIT_ASSERT_EQUAL(std::string("  7"), call_string("string.lpad", {"7", int64_t(3)}));
+  CPPUNIT_ASSERT_EQUAL(std::string("7  "), call_string("string.rpad", {"7", int64_t(3)}));
+  CPPUNIT_ASSERT_EQUAL(std::string("007"), call_string("string.lpad", {"7", int64_t(3), "0"}));
+  CPPUNIT_ASSERT_EQUAL(std::string("700"), call_string("string.rpad", {"7", int64_t(3), "0"}));
+
+  // Text that is already long enough is returned unchanged.
+  CPPUNIT_ASSERT_EQUAL(std::string("abcd"), call_string("string.lpad", {"abcd", int64_t(2)}));
+  CPPUNIT_ASSERT_EQUAL(std::string("abcd"), call_string("string.rpad", {"abcd", int64_t(4)}));
+
+  // Multi-character padding is repeated, and an empty padding is a no-op.
+  CPPUNIT_ASSERT_EQUAL(std::string("axyx"), call_string("string.rpad", {"a", int64_t(4), "xy"}));
+  CPPUNIT_ASSERT_EQUAL(std::string("a"), call_string("string.rpad", {"a", int64_t(4), ""}));
+
+  // Padding is counted in utf-8 characters, not bytes.
+  CPPUNIT_ASSERT_EQUAL(std::string("00日"), call_string("string.lpad", {"日", int64_t(3), "0"}));
+}
+
+void
+TestCommandString::test_strip() {
+  CPPUNIT_ASSERT_EQUAL(std::string("a b"), call_string("string.strip", {"  a b  "}));
+  CPPUNIT_ASSERT_EQUAL(std::string("a"), call_string("string.strip", {"\t\n a \r\n"}));
+  CPPUNIT_ASSERT_EQUAL(std::string("a  "), call_string("string.lstrip", {"  a  "}));
+  CPPUNIT_ASSERT_EQUAL(std::string("  a"), call_string("string.rstrip", {"  a  "}));
+
+  CPPUNIT_ASSERT_EQUAL(std::string("a"), call_string("string.strip", {"xxaxx", "x"}));
+  CPPUNIT_ASSERT_EQUAL(std::string("a"), call_string("string.strip", {"/x/a/x/", "/", "x"}));
+  CPPUNIT_ASSERT_EQUAL(std::string(""), call_string("string.strip", {"aaa", "a"}));
+  CPPUNIT_ASSERT_EQUAL(std::string("  a  "), call_string("string.strip", {"  a  ", ""}));
+
+  // The strippable argument is a set of utf-8 characters.
+  CPPUNIT_ASSERT_EQUAL(std::string("a"), call_string("string.strip", {"日a日", "日"}));
+}
+
+void
+TestCommandString::test_map() {
+  CPPUNIT_ASSERT_EQUAL(std::string("b"), call_string("string.map", {"a", args({"a", "b"})}));
+  CPPUNIT_ASSERT_EQUAL(std::string("c"), call_string("string.map", {"c", args({"a", "b"})}));
+
+  // Only whole-string matches are replaced.
+  CPPUNIT_ASSERT_EQUAL(std::string("ab"), call_string("string.map", {"ab", args({"a", "b"})}));
+
+  // The first matching pair wins.
+  CPPUNIT_ASSERT_EQUAL(std::string("y"), call_string("string.map", {"x", args({"a", "b"}), args({"x", "y"}), args({"x", "z"})}));
+}
+
+void
+TestCommandString::test_replace() {
+  CPPUNIT_ASSERT_EQUAL(std::string("a+b+c"), call_string("string.replace", {"a-b-c", args({"-", "+"})}));
+  CPPUNIT_ASSERT_EQUAL(std::string("abc"), call_string("string.replace", {"a-b-c", args({"-", ""})}));
+  CPPUNIT_ASSERT_EQUAL(std::string("a-b-c"), call_string("string.replace", {"a-b-c", args({"x", "y"})}));
+
+  // Pairs are applied in order, left to right.
+  CPPUNIT_ASSERT_EQUAL(std::string("xby"), call_string("string.replace", {"abc", args({"a", "x"}), args({"c", "y"})}));
+
+  // A replacement that contains the replaced text terminates.
+  CPPUNIT_ASSERT_EQUAL(std::string("aaaa"), call_string("string.replace", {"aa", args({"a", "aa"})}));
+}
+
+void
+TestCommandString::test_invalid_arguments() {
+  CPPUNIT_ASSERT_THROW(rpc::commands.call_command("string.length", torrent::Object()), torrent::input_error);
+  CPPUNIT_ASSERT_THROW(call_string("string.length", {"a", "b"}), torrent::input_error);
+  CPPUNIT_ASSERT_THROW(call_value("string.equals", {"a"}), torrent::input_error);
+  CPPUNIT_ASSERT_THROW(call_value("string.contains", {"a"}), torrent::input_error);
+  CPPUNIT_ASSERT_THROW(call_list("string.split", {"a"}), torrent::input_error);
+  CPPUNIT_ASSERT_THROW(call_string("string.lpad", {"a"}), torrent::input_error);
+
+  // The character count of string.substr cannot be negative.
+  CPPUNIT_ASSERT_THROW(call_string("string.substr", {"abc", int64_t(0), int64_t(-1)}), torrent::input_error);
+
+  // Both string.map and string.replace require {old, new} pairs.
+  CPPUNIT_ASSERT_THROW(call_string("string.map", {"a", "b"}), torrent::input_error);
+  CPPUNIT_ASSERT_THROW(call_string("string.replace", {"a", args({"a", "b", "c"})}), torrent::input_error);
+  CPPUNIT_ASSERT_THROW(call_string("string.replace", {"a", args({"", "b"})}), torrent::input_error);
+}
+
+void
+TestCommandString::test_config_syntax() {
+  CPPUNIT_ASSERT_EQUAL(int64_t(3), parse("string.length=abc").as_value());
+  CPPUNIT_ASSERT_EQUAL(int64_t(1), parse("string.contains=retracker.local,retracker").as_value());
+  CPPUNIT_ASSERT_EQUAL(int64_t(1), parse("string.starts_with=udp://tracker.example.com,http://,udp://").as_value());
+  CPPUNIT_ASSERT_EQUAL(std::string("cde"), parse("string.substr=abcdef,2,3").as_string());
+  CPPUNIT_ASSERT_EQUAL(std::string("padded"), parse("string.strip=\"  padded  \"").as_string());
+
+  // The {old, new} pairs are written as a block in the configuration file.
+  CPPUNIT_ASSERT_EQUAL(std::string("a+b+c"), parse("string.replace=a-b-c,{-,+}").as_string());
+  CPPUNIT_ASSERT_EQUAL(std::string("y"), parse("string.map=x,{a,b},{x,y}").as_string());
+
+  // Commands nest, so a split can be joined back together.
+  CPPUNIT_ASSERT_EQUAL(std::string("a-b-c"), parse("string.join=-,(string.split,a.b.c,.)").as_string());
+}

test/src/test_command_string.h

@@ -0,0 +1,41 @@
+#include "test/helpers/test_fixture.h"
+
+class TestCommandString : public test_fixture {
+  CPPUNIT_TEST_SUITE(TestCommandString);
+
+  CPPUNIT_TEST(test_length);
+  CPPUNIT_TEST(test_equals);
+  CPPUNIT_TEST(test_starts_with);
+  CPPUNIT_TEST(test_ends_with);
+  CPPUNIT_TEST(test_contains);
+  CPPUNIT_TEST(test_substr);
+  CPPUNIT_TEST(test_split);
+  CPPUNIT_TEST(test_join);
+  CPPUNIT_TEST(test_pad);
+  CPPUNIT_TEST(test_strip);
+  CPPUNIT_TEST(test_map);
+  CPPUNIT_TEST(test_replace);
+  CPPUNIT_TEST(test_invalid_arguments);
+  CPPUNIT_TEST(test_config_syntax);
+
+  CPPUNIT_TEST_SUITE_END();
+
+public:
+  void setUp();
+  void tearDown();
+
+  void test_length();
+  void test_equals();
+  void test_starts_with();
+  void test_ends_with();
+  void test_contains();
+  void test_substr();
+  void test_split();
+  void test_join();
+  void test_pad();
+  void test_strip();
+  void test_map();
+  void test_replace();
+  void test_invalid_arguments();
+  void test_config_syntax();
+};

test/src/test_command_system.cc

@@ -1,6 +1,6 @@
 #include "config.h"
 
-#include "test/src/test_command_local.h"
+#include "test/src/test_command_system.h"
 
 #include <torrent/torrent.h>
 #include <torrent/runtime/socket_manager.h>
@@ -10,12 +10,12 @@
 #include "globals.h"
 #include "rpc/parse_commands.h"
 
-CPPUNIT_TEST_SUITE_REGISTRATION(TestCommandLocal);
+CPPUNIT_TEST_SUITE_REGISTRATION(TestCommandSystem);
 
-void initialize_command_local();
+void initialize_command_system();
 
 void
-TestCommandLocal::setUp() {
+TestCommandSystem::setUp() {
   torrent::initialize_main_thread();
   torrent::initialize();
 
@@ -23,16 +23,16 @@ TestCommandLocal::setUp() {
     control = new Control;
 
   if (!rpc::commands.has("system.sockets.size"))
-    initialize_command_local();
+    initialize_command_system();
 }
 
 void
-TestCommandLocal::tearDown() {
+TestCommandSystem::tearDown() {
   torrent::cleanup();
 }
 
 void
-TestCommandLocal::test_socket_category_commands() {
+TestCommandSystem::test_socket_category_commands() {
   for (uint32_t i = 0; i < torrent::runtime::SocketManager::category_count; ++i) {
     auto category = static_cast<torrent::runtime::socket_manager_category_t>(i);
     auto name     = "system.sockets." + torrent::option_to_str_or_throw(torrent::OPTION_SOCKET_CATEGORY, i);

test/src/test_command_system.h

@@ -1,7 +1,7 @@
 #include "test/helpers/test_fixture.h"
 
-class TestCommandLocal : public test_fixture {
+class TestCommandSystem : public test_fixture {
-  CPPUNIT_TEST_SUITE(TestCommandLocal);
+  CPPUNIT_TEST_SUITE(TestCommandSystem);
 
   CPPUNIT_TEST(test_socket_category_commands);
 

test/src/test_setup.cc

@@ -0,0 +1,78 @@
+#include "config.h"
+
+#include "test/src/test_setup.h"
+
+#include <fstream>
+#include <string>
+#include <unistd.h>
+#include <torrent/exceptions.h>
+
+#include "setup.h"
+
+CPPUNIT_TEST_SUITE_REGISTRATION(TestSetup);
+
+// Linking setup.o pulls in the help printer, which lives in src/main.cc.
+void
+print_help() {}
+
+namespace {
+
+class temp_config_file {
+public:
+  temp_config_file(const std::string& contents) {
+    char path[] = "/tmp/rtorrent_test_setup_XXXXXX";
+
+    CPPUNIT_ASSERT(::mkstemp(path) != -1);
+    m_path = path;
+
+    std::ofstream file(m_path);
+    file << contents << '\n';
+  }
+
+  ~temp_config_file() { ::unlink(m_path.c_str()); }
+
+  const std::string& path() const { return m_path; }
+
+private:
+  std::string m_path;
+};
+
+// The group name must be a valid one, else option_find_string throws before
+// the output argument is ever touched.
+void
+assert_arg_count_error(const std::string& line) {
+  temp_config_file file(line);
+
+  try {
+    parse_config_file_comments(file.path());
+  } catch (torrent::input_error& e) {
+    CPPUNIT_ASSERT_EQUAL(std::string("Invalid number of arguments."), std::string(e.what()));
+    return;
+  }
+
+  CPPUNIT_FAIL("no torrent::input_error thrown for: " + line);
+}
+
+} // namespace
+
+void
+TestSetup::test_config_comment_log_add_output() {
+  temp_config_file file("# do:log.add_output=debug,test_output");
+
+  CPPUNIT_ASSERT_NO_THROW(parse_config_file_comments(file.path()));
+}
+
+void
+TestSetup::test_config_comment_log_add_output_no_args() {
+  assert_arg_count_error("# do:log.add_output=");
+}
+
+void
+TestSetup::test_config_comment_log_add_output_one_arg() {
+  assert_arg_count_error("# do:log.add_output=debug");
+}
+
+void
+TestSetup::test_config_comment_log_add_output_too_many_args() {
+  assert_arg_count_error("# do:log.add_output=debug,test_output,extra");
+}

test/src/test_setup.h

@@ -0,0 +1,18 @@
+#include "test/helpers/test_fixture.h"
+
+class TestSetup : public test_fixture {
+  CPPUNIT_TEST_SUITE(TestSetup);
+
+  CPPUNIT_TEST(test_config_comment_log_add_output);
+  CPPUNIT_TEST(test_config_comment_log_add_output_no_args);
+  CPPUNIT_TEST(test_config_comment_log_add_output_one_arg);
+  CPPUNIT_TEST(test_config_comment_log_add_output_too_many_args);
+
+  CPPUNIT_TEST_SUITE_END();
+
+public:
+  void test_config_comment_log_add_output();
+  void test_config_comment_log_add_output_no_args();
+  void test_config_comment_log_add_output_one_arg();
+  void test_config_comment_log_add_output_too_many_args();
+};