util/qemu-sockets.c: Support specifying IPv4 or IPv6 in socket_dgram()

Currently you can specify whether you want a UDP chardev backend
to be IPv4 or IPv6 using the ipv4 or ipv6 options if you use the
QemuOpts parsing code in inet_dgram_opts(). However the QMP struct
parsing code in socket_dgram() doesn't provide this flexibility
(which in turn prevents us from converting the UDP backend handling
to the new style QAPI framework).

Use the existing inet_addr_to_opts() function to convert the
remote->inet address to option strings; this handles ipv4 and
ipv6 flags as well as host and port. (It will also convert any
'to' specification, which is harmless as it is ignored in this
context.)
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Message-id: 1409653457-27863-3-git-send-email-peter.maydell@linaro.org

util/qemu-sockets.c

@@ -966,8 +966,7 @@ int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp)
     opts = qemu_opts_create(&socket_optslist, NULL, 0, &error_abort);
     switch (remote->kind) {
     case SOCKET_ADDRESS_KIND_INET:
-        qemu_opt_set(opts, "host", remote->inet->host);
-        qemu_opt_set(opts, "port", remote->inet->port);
+        inet_addr_to_opts(opts, remote->inet);
         if (local) {
             qemu_opt_set(opts, "localaddr", local->inet->host);
             qemu_opt_set(opts, "localport", local->inet->port);