[Qemu-devel] [PATCH 6/8] ui: let VNC server listen on all resolved IP addresses

["Daniel P. Berrange" <berrange@redhat.com>]

Remove the limitation that the VNC server can only listen on
a single resolved IP address. This uses the new DNS resolver
API to resolve a SocketAddress struct into an array of
SocketAddress structs containing raw IP addresses. The VNC
server will then attempt to listen on all resolve IP addresses.
An error will be returned if it was not possible to listen on
all of the IP addresses.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
---
 ui/vnc.c | 52 +++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 43 insertions(+), 9 deletions(-)

diff --git a/ui/vnc.c b/ui/vnc.c
index 94135c8..d21ede9 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -45,6 +45,7 @@
 #include "crypto/tlscredsx509.h"
 #include "qom/object_interfaces.h"
 #include "qemu/cutils.h"
+#include "io/dns-resolver.h"
 
 #define VNC_REFRESH_INTERVAL_BASE GUI_REFRESH_INTERVAL_DEFAULT
 #define VNC_REFRESH_INTERVAL_INC  50
@@ -3722,19 +3723,52 @@ static int vnc_display_listen_addr(VncDisplay *vd,
                                    size_t *nlsock,
                                    Error **errp)
 {
-    *nlsock = 1;
-    *lsock = g_new0(QIOChannelSocket *, 1);
-    *lsock_tag = g_new0(guint, 1);
+    QIODNSResolver *resolver = qio_dns_resolver_get_instance();
+    SocketAddress **rawaddrs = NULL;
+    size_t nrawaddrs = 0;
+    Error *listenerr = NULL;
+    size_t i;
 
-    (*lsock)[0] = qio_channel_socket_new();
-    qio_channel_set_name(QIO_CHANNEL((*lsock)[0]), name);
-    if (qio_channel_socket_listen_sync((*lsock)[0], addr, errp) < 0) {
+    if (qio_dns_resolver_lookup_sync(resolver, addr, &nrawaddrs,
+                                     &rawaddrs, errp) < 0) {
         return -1;
     }
 
-    (*lsock_tag)[0] = qio_channel_add_watch(
-        QIO_CHANNEL((*lsock)[0]),
-        G_IO_IN, vnc_listen_io, vd, NULL);
+    for (i = 0; i < nrawaddrs; i++) {
+        QIOChannelSocket *sioc = qio_channel_socket_new();
+
+        qio_channel_set_name(QIO_CHANNEL(sioc), name);
+        if (qio_channel_socket_listen_sync(
+                sioc, rawaddrs[i], listenerr == NULL ? &listenerr : NULL) < 0) {
+            continue;
+        }
+        (*nlsock)++;
+        *lsock = g_renew(QIOChannelSocket *, *lsock, *nlsock);
+        *lsock_tag = g_renew(guint, *lsock_tag, *nlsock);
+
+        (*lsock)[*nlsock - 1] = sioc;
+        (*lsock_tag)[*nlsock - 1] = 0;
+    }
+
+    for (i = 0; i < nrawaddrs; i++) {
+        qapi_free_SocketAddress(rawaddrs[i]);
+    }
+    g_free(rawaddrs);
+
+    if (listenerr) {
+        if (*nlsock == 0) {
+            error_propagate(errp, listenerr);
+            return -1;
+        } else {
+            error_free(listenerr);
+        }
+    }
+
+    for (i = 0; i < *nlsock; i++) {
+        (*lsock_tag)[i] = qio_channel_add_watch(
+            QIO_CHANNEL((*lsock)[i]),
+            G_IO_IN, vnc_listen_io, vd, NULL);
+    }
 
     return 0;
 }
-- 
2.9.3