From 9e58d7a7561ace2e4ed62049f9d0ff488e1bb7f1 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Mon, 25 Sep 2023 13:08:27 +0200 Subject: [PATCH] ui/vnc: Require audiodev= to enable audio MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Paolo Bonzini --- docs/about/deprecated.rst | 8 +++----- docs/about/removed-features.rst | 6 ++++++ ui/vnc.c | 11 ++++++++++- ui/vnc.h | 2 ++ 4 files changed, 21 insertions(+), 6 deletions(-) diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst index 8f3fef97bd..c07bf58dde 100644 --- a/docs/about/deprecated.rst +++ b/docs/about/deprecated.rst @@ -45,13 +45,11 @@ backend settings instead of environment variables. To ease migration to the new format, the ``-audiodev-help`` option can be used to convert the current values of the environment variables to ``-audiodev`` options. -Creating sound card devices and vnc without ``audiodev=`` property (since 4.2) -'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' +Creating sound card devices without ``audiodev=`` property (since 4.2) +'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' When not using the deprecated legacy audio config, each sound card -should specify an ``audiodev=`` property. Additionally, when using -vnc, you should specify an ``audiodev=`` property if you plan to -transmit audio through the VNC protocol. +should specify an ``audiodev=`` property. Short-form boolean options (since 6.0) '''''''''''''''''''''''''''''''''''''' diff --git a/docs/about/removed-features.rst b/docs/about/removed-features.rst index 97ec47f1d2..276060b320 100644 --- a/docs/about/removed-features.rst +++ b/docs/about/removed-features.rst @@ -436,6 +436,12 @@ the process listing. This was replaced by the new ``password-secret`` option which lets the password be securely provided on the command line using a ``secret`` object instance. +Creating vnc without ``audiodev=`` property (removed in 8.2) +'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' + +When using vnc, you should specify an ``audiodev=`` property if +you plan to transmit audio through the VNC protocol. + QEMU Machine Protocol (QMP) commands ------------------------------------ diff --git a/ui/vnc.c b/ui/vnc.c index c302bb07a5..acb56461b2 100644 --- a/ui/vnc.c +++ b/ui/vnc.c @@ -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; diff --git a/ui/vnc.h b/ui/vnc.h index 757fa83044..96d19dce19 100644 --- a/ui/vnc.h +++ b/ui/vnc.h @@ -464,6 +464,7 @@ enum VncFeatures { VNC_FEATURE_LED_STATE, VNC_FEATURE_XVP, VNC_FEATURE_CLIPBOARD_EXT, + VNC_FEATURE_AUDIO, }; #define VNC_FEATURE_RESIZE_MASK (1 << VNC_FEATURE_RESIZE) @@ -481,6 +482,7 @@ enum VncFeatures { #define VNC_FEATURE_LED_STATE_MASK (1 << VNC_FEATURE_LED_STATE) #define VNC_FEATURE_XVP_MASK (1 << VNC_FEATURE_XVP) #define VNC_FEATURE_CLIPBOARD_EXT_MASK (1 << VNC_FEATURE_CLIPBOARD_EXT) +#define VNC_FEATURE_AUDIO_MASK (1 << VNC_FEATURE_AUDIO) /* Client -> Server message IDs */