Catch every json exception when processing a JSONRPC request.

A number overflow escaped the two handlers and killed the process.

src/rpc/jsonrpc.cc

@@ -258,11 +258,8 @@ JsonRpc::process(const char* in_buffer, uint32_t length, slot_write callback) {
 
     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/scgi_task.cc

@@ -94,8 +94,12 @@ 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);