From 07a824f03fe1e820b5a0f19c380b19595ac0caa9 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Wed, 10 Oct 2012 14:30:58 +0200
Subject: [PATCH] vnc: fix "info vnc" with "-vnc ..., reverse=on"

When reverse connection is in use, there is no active VNC server
socket.  Because of this, getsockopt(-1, ...) is attempted and
the following error is emitted:

    $ socat TCP-LISTEN:5900,reuseaddr TCP-LISTEN:5901,reuseaddr &
    $ x86_64-softmmu/qemu-system-x86_64 -vnc localhost:5900,reverse -monitor stdio
    QEMU 1.2.50 monitor - type 'help' for more information
    (qemu) info vnc
    An undefined error has occurred

Because however the host, family, service and auth fields are
optional, we can just exit if there is no active server socket.

    $ x86_64-softmmu/qemu-system-x86_64 -vnc localhost:5900,reverse -monitor stdio
    QEMU 1.2.50 monitor - type 'help' for more information
    (qemu) info vnc
    Server:
    Client:
         address: 127.0.0.1:5900
      x509_dname: none
        username: none

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
(cherry picked from commit 417b0b88904fe1dd8c41bff8092dfbab0134d9cb)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 ui/vnc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ui/vnc.c b/ui/vnc.c
index 18ec101..66ae930 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -372,6 +372,10 @@ VncInfo *qmp_query_vnc(Error **errp)
             }
         }
 
+        if (vnc_display->lsock == -1) {
+            return info;
+        }
+
         if (getsockname(vnc_display->lsock, (struct sockaddr *)&sa,
                         &salen) == -1) {
             error_set(errp, QERR_UNDEFINED_ERROR);