Fix TCP discovery server locators translation (#5410)

---------

Signed-off-by: cferreiragonz <[email protected]>

Author: cferreiragonz

src/cpp/rtps/security/SecurityManager.cpp

@@ -1173,7 +1173,6 @@ bool SecurityManager::create_participant_stateless_message_reader()
         ratt.endpoint.multicastLocatorList = pattr.builtin.metatrafficMulticastLocatorList;
     }
     ratt.endpoint.unicastLocatorList = pattr.builtin.metatrafficUnicastLocatorList;
-    ratt.endpoint.remoteLocatorList = pattr.builtin.initialPeersList;
     ratt.endpoint.external_unicast_locators = pattr.builtin.metatraffic_external_unicast_locators;
     ratt.endpoint.ignore_non_matching_locators = pattr.ignore_non_matching_locators;
     ratt.matched_writers_allocation = pattr.allocation.participants;
@@ -1273,7 +1272,6 @@ bool SecurityManager::create_participant_volatile_message_secure_writer()
     watt.endpoint.unicastLocatorList = pattr.builtin.metatrafficUnicastLocatorList;
     watt.endpoint.external_unicast_locators = pattr.builtin.metatraffic_external_unicast_locators;
     watt.endpoint.ignore_non_matching_locators = pattr.ignore_non_matching_locators;
-    watt.endpoint.remoteLocatorList = pattr.builtin.initialPeersList;
     watt.endpoint.security_attributes().is_submessage_protected = true;
     watt.endpoint.security_attributes().plugin_endpoint_attributes =
             PLUGIN_ENDPOINT_SECURITY_ATTRIBUTES_FLAG_IS_SUBMESSAGE_ENCRYPTED;
@@ -1326,7 +1324,6 @@ bool SecurityManager::create_participant_volatile_message_secure_reader()
     ratt.endpoint.unicastLocatorList = pattr.builtin.metatrafficUnicastLocatorList;
     ratt.endpoint.external_unicast_locators = pattr.builtin.metatraffic_external_unicast_locators;
     ratt.endpoint.ignore_non_matching_locators = pattr.ignore_non_matching_locators;
-    ratt.endpoint.remoteLocatorList = pattr.builtin.initialPeersList;
     ratt.endpoint.security_attributes().is_submessage_protected = true;
     ratt.endpoint.security_attributes().plugin_endpoint_attributes =
             PLUGIN_ENDPOINT_SECURITY_ATTRIBUTES_FLAG_IS_SUBMESSAGE_ENCRYPTED;

src/cpp/rtps/transport/TCPTransportInterface.cpp

@@ -191,6 +191,7 @@ void TCPTransportInterface::clean()
 
     {
         std::vector<std::shared_ptr<TCPChannelResource>> channels;
+        std::vector<eprosima::fastdds::rtps::Locator> delete_channels;
 
         {
             std::unique_lock<std::mutex> scopedLock(sockets_map_mutex_);
@@ -200,10 +201,22 @@ void TCPTransportInterface::clean()
 
             for (auto& channel : channel_resources_)
             {
-                channels.push_back(channel.second);
+                if (std::find(channels.begin(), channels.end(), channel.second) == channels.end())
+                {
+                    channels.push_back(channel.second);
+                }
+                else
+                {
+                    delete_channels.push_back(channel.first);
+                }
             }
         }
 
+        for (auto& delete_channel : delete_channels)
+        {
+            channel_resources_.erase(delete_channel);
+        }
+
         for (auto& channel : channels)
         {
             if (channel->connection_established())
@@ -279,7 +292,7 @@ Locator TCPTransportInterface::local_endpoint_to_locator(
     return locator;
 }
 
-void TCPTransportInterface::bind_socket(
+ResponseCode TCPTransportInterface::bind_socket(
         std::shared_ptr<TCPChannelResource>& channel)
 {
     std::unique_lock<std::mutex> scopedLock(sockets_map_mutex_);
@@ -288,7 +301,29 @@ void TCPTransportInterface::bind_socket(
     auto it_remove = std::find(unbound_channel_resources_.begin(), unbound_channel_resources_.end(), channel);
     assert(it_remove != unbound_channel_resources_.end());
     unbound_channel_resources_.erase(it_remove);
-    channel_resources_[channel->locator()] = channel;
+
+    ResponseCode ret = RETCODE_OK;
+    const auto insert_ret = channel_resources_.insert(
+        decltype(channel_resources_)::value_type{channel->locator(), channel});
+    if (false == insert_ret.second)
+    {
+        // There is an existing channel that can be used. Force the Client to close unnecessary socket
+        ret = RETCODE_SERVER_ERROR;
+    }
+
+    std::vector<fastdds::rtps::IPFinder::info_IP> local_interfaces;
+    // Check if the locator is from an owned interface to link all local interfaces to the channel
+    is_own_interface(channel->locator(), local_interfaces);
+    if (!local_interfaces.empty())
+    {
+        Locator local_locator(channel->locator());
+        for (auto& interface_it : local_interfaces)
+        {
+            IPLocator::setIPv4(local_locator, interface_it.locator);
+            channel_resources_.insert(decltype(channel_resources_)::value_type{local_locator, channel});
+        }
+    }
+    return ret;
 }
 
 bool TCPTransportInterface::check_crc(
@@ -923,7 +958,7 @@ bool TCPTransportInterface::CreateInitialConnect(
     std::lock_guard<std::mutex> socketsLock(sockets_map_mutex_);
 
     // We try to find a SenderResource that has this locator.
-    // Note: This is done in this level because if we do in NetworkFactory level, we have to mantain what transport
+    // Note: This is done in this level because if we do it at NetworkFactory level, we have to mantain what transport
     // already reuses a SenderResource.
     for (auto& sender_resource : send_resource_list)
     {
@@ -987,6 +1022,19 @@ bool TCPTransportInterface::CreateInitialConnect(
     send_resource_list.emplace_back(
         static_cast<SenderResource*>(new TCPSenderResource(*this, physical_locator)));
 
+    std::vector<fastdds::rtps::IPFinder::info_IP> local_interfaces;
+    // Check if the locator is from an owned interface to link all local interfaces to the channel
+    is_own_interface(physical_locator, local_interfaces);
+    if (!local_interfaces.empty())
+    {
+        Locator local_locator(physical_locator);
+        for (auto& interface_it : local_interfaces)
+        {
+            IPLocator::setIPv4(local_locator, interface_it.locator);
+            channel_resources_[local_locator] = channel;
+        }
+    }
+
     return true;
 }
 
@@ -2079,6 +2127,28 @@ void TCPTransportInterface::send_channel_pending_logical_ports(
     }
 }
 
+void TCPTransportInterface::is_own_interface(
+        const Locator& locator,
+        std::vector<fastdds::rtps::IPFinder::info_IP>& locNames) const
+{
+    std::vector<fastdds::rtps::IPFinder::info_IP> local_interfaces;
+    get_ips(local_interfaces, true, false);
+    for (const auto& interface_it : local_interfaces)
+    {
+        if (IPLocator::compareAddress(locator, interface_it.locator) && is_interface_allowed(interface_it.name))
+        {
+            locNames = local_interfaces;
+            // Remove interface of original locator from the list
+            locNames.erase(std::remove_if(locNames.begin(), locNames.end(),
+                    [&interface_it](const fastdds::rtps::IPFinder::info_IP& locInterface)
+                    {
+                        return locInterface.locator == interface_it.locator;
+                    }), locNames.end());
+            break;
+        }
+    }
+}
+
 } // namespace rtps
 } // namespace fastdds
 } // namespace eprosima

src/cpp/rtps/transport/TCPTransportInterface.h

@@ -239,7 +239,7 @@ class TCPTransportInterface : public TransportInterface
     virtual ~TCPTransportInterface();
 
     //! Stores the binding between the given locator and the given TCP socket. Server side.
-    void bind_socket(
+    ResponseCode bind_socket(
             std::shared_ptr<TCPChannelResource>&);
 
     //! Removes the listening socket for the specified port.
@@ -525,6 +525,16 @@ class TCPTransportInterface : public TransportInterface
      */
     void send_channel_pending_logical_ports(
             std::shared_ptr<TCPChannelResource>& channel);
+
+    /**
+     * Method to check if a locator contains an interface that belongs to the same host.
+     * If it occurs, @c locNames will be updated with the list of interfaces of the host.
+     * @param [in]     locator Locator to check.
+     * @param [in,out] locNames Vector of interfaces to be updated.
+     */
+    void is_own_interface(
+            const Locator& locator,
+            std::vector<fastdds::rtps::IPFinder::info_IP>& locNames) const;
 };
 
 } // namespace rtps

src/cpp/rtps/transport/tcp/RTCPMessageManager.cpp

@@ -458,7 +458,7 @@ ResponseCode RTCPMessageManager::processBindConnectionRequest(
 
     if (RETCODE_OK == code)
     {
-        mTransport->bind_socket(channel);
+        code = mTransport->bind_socket(channel);
     }
 
     sendData(channel, BIND_CONNECTION_RESPONSE, transaction_id, &payload, code);

test/unittest/transport/TCPv4Tests.cpp

@@ -2001,6 +2001,9 @@ TEST_F(TCPv4Tests, autofill_port)
 // This test verifies server's channel resources mapping keys uniqueness, where keys are clients locators.
 // Clients typically communicated its PID as its locator port. When having several clients in the same
 // process this lead to overwriting server's channel resources map elements.
+// In order to ensure communication in TCP Discovery Server, a different entry is created in the server's
+// channel resources map for each IP interface found, all of them using the same TCP channel. Thus, two
+// clients will generate at least two entries in the server's channel resources map.
 TEST_F(TCPv4Tests, client_announced_local_port_uniqueness)
 {
     TCPv4TransportDescriptor recvDescriptor;
@@ -2032,7 +2035,12 @@ TEST_F(TCPv4Tests, client_announced_local_port_uniqueness)
 
     std::this_thread::sleep_for(std::chrono::milliseconds(100));
 
-    ASSERT_EQ(receiveTransportUnderTest.get_channel_resources().size(), 2u);
+    std::set<std::shared_ptr<TCPChannelResource>> channels_created;
+    for (const auto& channel_resource : receiveTransportUnderTest.get_channel_resources())
+    {
+        channels_created.insert(channel_resource.second);
+    }
+    ASSERT_EQ(channels_created.size(), 2u);
 }
 
 #ifndef _WIN32

tools/fds/server.cpp

@@ -304,6 +304,8 @@ int fastdds_discovery_server(
     // Retrieve first TCP port
     option::Option* pO_tcp_port = options[TCP_PORT];
 
+    bool udp_server_initialized = (pOp != nullptr) || (pO_port != nullptr);
+
     /**
      * A locator has been initialized previously in [0.0.0.0] address using either the DEFAULT_ROS2_SERVER_PORT or the
      * port number set in the CLI. This locator must be used:
@@ -318,6 +320,7 @@ int fastdds_discovery_server(
         // Add default locator in cases a) and b)
         participantQos.wire_protocol().builtin.metatrafficUnicastLocatorList.clear();
         participantQos.wire_protocol().builtin.metatrafficUnicastLocatorList.push_back(locator4);
+        udp_server_initialized = true;
     }
     else if (nullptr == pOp && nullptr != pO_port)
     {
@@ -569,6 +572,7 @@ int fastdds_discovery_server(
     }
 
     fastdds::rtps::GuidPrefix_t guid_prefix = participantQos.wire_protocol().prefix;
+    participantQos.transport().use_builtin_transports = udp_server_initialized || options[XML_FILE] != nullptr;
 
     // Create the server
     int return_value = 0;