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Network interface selection for outgoing UDP multicast datagrams

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Default  selection  is  the  loop-back interface.  Users  who  require
interoperation  between  WSJT-X   instances  cooperating  applications
running on different hosts should  select a suitable network interface
and  carefully choose  a multicast  group address,  and TTL,  that has
minimal scope covering the necessary  network(s). Using 224.0.0.1 is a
reasonable    strategy    if   all    hosts    are    on   the    same
subnet. Administratively  scoped multicast group addresses  like those
within 239.255.0.0/16  can cover larger  boundaries, but care  must be
taken if the local subnet has access to a multicast enabled router.

The  IPv4  broadcast  address  (255.255.255.255) may  be  used  as  an
alternative  to multicast  UDP, but  note that  WSJT-X will  only send
broadcast UDP datagrams  on the loop-back interface,  so all recipient
applications must be running on the same host system.

The reference UDP Message protocol  applications are being extended to
be configurable  with a list of  interfaces to join a  multicast group
address on. By default they will only join on the loop-back interface,
which is also  recommended for any applications designed  to take part
in the WSJT-X  UDP Message Protocol. This allows full  user control of
the  scope of  multicast  group membership  with  a very  conservative
default  mode  that will  work  with  all interoperating  applications
running on the same host system.
This commit is contained in:
Bill Somerville
2020-11-02 15:33:44 +00:00
parent 072da278ee
commit 430d57c1ca
11 changed files with 510 additions and 139 deletions
Download Patch File Download Diff File Expand all files Collapse all files
widgets/mainwindow.cpp
+3 -1
View File
@@ -414,6 +414,7 @@ MainWindow::MainWindow(QDir const& temp_directory, bool multiple,
m_messageClient {new MessageClient {QApplication::applicationName (),
version (), revision (),
m_config.udp_server_name (), m_config.udp_server_port (),
m_config.udp_interface_name (), m_config.udp_TTL (),
this}},
m_psk_Reporter {&m_config, QString {"WSJT-X v" + version () + " " + m_revision}.simplified ()},
m_manual {&m_network_manager},
@@ -782,6 +783,7 @@ MainWindow::MainWindow(QDir const& temp_directory, bool multiple,
connect (&m_config, &Configuration::transceiver_failure, this, &MainWindow::handle_transceiver_failure);
connect (&m_config, &Configuration::udp_server_changed, m_messageClient, &MessageClient::set_server);
connect (&m_config, &Configuration::udp_server_port_changed, m_messageClient, &MessageClient::set_server_port);
connect (&m_config, &Configuration::udp_TTL_changed, m_messageClient, &MessageClient::set_TTL);
connect (&m_config, &Configuration::accept_udp_requests_changed, m_messageClient, &MessageClient::enable);
connect (&m_config, &Configuration::enumerating_audio_devices, [this] () {
showStatusMessage (tr ("Enumerating audio devices"));
@@ -7824,7 +7826,7 @@ void MainWindow::networkError (QString const& e)
, MessageBox::Cancel))
{
// retry server lookup
m_messageClient->set_server (m_config.udp_server_name ());
m_messageClient->set_server (m_config.udp_server_name (), m_config.udp_interface_name ());
}
}