Give network.xmlrpc.size_limit.set a floor

A limit below any valid request rejects the request that would raise it again.

src/rpc/rpc_manager.cc

@@ -172,6 +172,9 @@ 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);
 }
 

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;