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ui/vnc: Require audiodev= to enable audio

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If there is no audiodev do not send the audio ack in response to
VNC_ENCODING_AUDIO, so that clients aren't told audio exists, and
immediately drop the client if they try to send any audio control messages
when audio is not advertised.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2023-09-25 13:08:27 +02:00
parent 0c1a5299ab
commit 9e58d7a756
4 changed files with 21 additions and 6 deletions
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11
ui/vnc.c
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@ -2195,7 +2195,10 @@ static void set_encodings(VncState *vs, int32_t *encodings, size_t n_encodings)
send_ext_key_event_ack(vs);
break;
case VNC_ENCODING_AUDIO:
send_ext_audio_ack(vs);
if (vs->vd->audio_state) {
vs->features |= VNC_FEATURE_AUDIO_MASK;
send_ext_audio_ack(vs);
}
break;
case VNC_ENCODING_WMVi:
vs->features |= VNC_FEATURE_WMVI_MASK;
@ -2502,6 +2505,12 @@ static int protocol_client_msg(VncState *vs, uint8_t *data, size_t len)
read_u32(data, 4), read_u32(data, 8));
break;
case VNC_MSG_CLIENT_QEMU_AUDIO:
if (!vnc_has_feature(vs, VNC_FEATURE_AUDIO)) {
error_report("Audio message %d with audio disabled", read_u8(data, 2));
vnc_client_error(vs);
break;
}
if (len == 2)
return 4;