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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 9e71d07075
commit 662ed0fa7a
11 changed files with 510 additions and 139 deletions
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Network/MessageClient.hpp
+11 -4
View File
@@ -5,6 +5,7 @@
#include <QTime>
#include <QDateTime>
#include <QString>
#include <QHostAddress>
#include "Radio.hpp"
#include "pimpl_h.hpp"
@@ -34,19 +35,25 @@ public:
//
// messages will be silently dropped until a server host lookup is complete
MessageClient (QString const& id, QString const& version, QString const& revision,
QString const& server, port_type server_port, QObject * parent = nullptr);
QString const& server_name, port_type server_port,
QString const& network_interface_name,
int TTL, QObject * parent = nullptr);
// query server details
QHostAddress server_address () const;
port_type server_port () const;
// initiate a new server host lookup or is the server name is empty
// the sending of messages is disabled
Q_SLOT void set_server (QString const& server = QString {});
// initiate a new server host lookup or if the server name is empty
// the sending of messages is disabled, if an interface is specified
// then that interface is used for outgoing datagrams
Q_SLOT void set_server (QString const& server_name, QString const& network_interface_name);
// change the server port messages are sent to
Q_SLOT void set_server_port (port_type server_port = 0u);
// change the server port messages are sent to
Q_SLOT void set_TTL (int TTL);
// enable incoming messages
Q_SLOT void enable (bool);