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Allow update of SRTP crypto keys without restarting the media streams.

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This commit is contained in:
Ghislain MARY 2012-12-21 16:31:40 +01:00
parent 58fa072da0
commit 8f60c4c9ad
5 changed files with 90 additions and 25 deletions
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57
coreapi/callbacks.c
View file

@ -104,31 +104,40 @@ void linphone_core_update_streams(LinphoneCore *lc, LinphoneCall *call, SalMedia
/* we already started media: check if we really need to restart it*/
if (oldmd){
int md_changed = media_parameters_changed(call, oldmd, new_md);
if ((md_changed == SAL_MEDIA_DESCRIPTION_UNCHANGED) && !call->playing_ringbacktone) {
/*as nothing has changed, keep the oldmd */
call->resultdesc=oldmd;
sal_media_description_unref(new_md);
if (call->all_muted){
ms_message("Early media finished, unmuting inputs...");
/*we were in early media, now we want to enable real media */
linphone_call_enable_camera (call,linphone_call_camera_enabled (call));
if (call->audiostream)
linphone_core_mute_mic (lc, linphone_core_is_mic_muted(lc));
#ifdef VIDEO_ENABLED
if (call->videostream && call->camera_active)
video_stream_change_camera(call->videostream,lc->video_conf.device );
#endif
}
ms_message("No need to restart streams, SDP is unchanged.");
return;
} else if ((md_changed == SAL_MEDIA_DESCRIPTION_NETWORK_CHANGED) && !call->playing_ringbacktone) {
call->resultdesc = oldmd;
ms_message("Network parameters have changed, update them.");
linphone_core_update_streams_destinations(lc, call, oldmd, new_md);
sal_media_description_unref(new_md);
return;
}else{
if ((md_changed & SAL_MEDIA_DESCRIPTION_CODEC_CHANGED) || call->playing_ringbacktone) {
ms_message("Media descriptions are different, need to restart the streams.");
} else {
if (md_changed == SAL_MEDIA_DESCRIPTION_UNCHANGED) {
/*as nothing has changed, keep the oldmd */
call->resultdesc=oldmd;
sal_media_description_unref(new_md);
if (call->all_muted){
ms_message("Early media finished, unmuting inputs...");
/*we were in early media, now we want to enable real media */
linphone_call_enable_camera (call,linphone_call_camera_enabled (call));
if (call->audiostream)
linphone_core_mute_mic (lc, linphone_core_is_mic_muted(lc));
#ifdef VIDEO_ENABLED
if (call->videostream && call->camera_active)
video_stream_change_camera(call->videostream,lc->video_conf.device );
#endif
}
ms_message("No need to restart streams, SDP is unchanged.");
return;
}
else {
if (md_changed & SAL_MEDIA_DESCRIPTION_NETWORK_CHANGED) {
ms_message("Network parameters have changed, update them.");
linphone_core_update_streams_destinations(lc, call, oldmd, new_md);
}
if (md_changed & SAL_MEDIA_DESCRIPTION_CRYPTO_CHANGED) {
ms_message("Crypto parameters have changed, update them.");
linphone_call_update_crypto_parameters(call, oldmd, new_md);
}
call->resultdesc = oldmd;
sal_media_description_unref(new_md);
return;
}
}
}
linphone_call_stop_media_streams (call);

46
coreapi/linphonecall.c
View file

@ -1658,6 +1658,52 @@ void linphone_call_stop_media_streams_for_ice_gathering(LinphoneCall *call){
#endif
}
void linphone_call_update_crypto_parameters(LinphoneCall *call, SalMediaDescription *old_md, SalMediaDescription *new_md) {
SalStreamDescription *old_stream;
SalStreamDescription *new_stream;
int i;
old_stream = sal_media_description_find_stream(old_md, SalProtoRtpSavp, SalAudio);
new_stream = sal_media_description_find_stream(new_md, SalProtoRtpSavp, SalAudio);
if (old_stream && new_stream) {
const SalStreamDescription *local_st_desc = sal_media_description_find_stream(call->localdesc, SalProtoRtpSavp, SalAudio);
int crypto_idx = find_crypto_index_from_tag(local_st_desc->crypto, new_stream->crypto_local_tag);
if (crypto_idx >= 0) {
audio_stream_enable_strp(call->audiostream, new_stream->crypto[0].algo, local_st_desc->crypto[crypto_idx].master_key, new_stream->crypto[0].master_key);
call->audiostream_encrypted = TRUE;
} else {
ms_warning("Failed to find local crypto algo with tag: %d", new_stream->crypto_local_tag);
call->audiostream_encrypted = FALSE;
}
for (i = 0; i < SAL_CRYPTO_ALGO_MAX; i++) {
old_stream->crypto[i].tag = new_stream->crypto[i].tag;
old_stream->crypto[i].algo = new_stream->crypto[i].algo;
strncpy(old_stream->crypto[i].master_key, new_stream->crypto[i].master_key, sizeof(old_stream->crypto[i].master_key) - 1);
}
}
#ifdef VIDEO_ENABLED
old_stream = sal_media_description_find_stream(old_md, SalProtoRtpSavp, SalVideo);
new_stream = sal_media_description_find_stream(new_md, SalProtoRtpSavp, SalVideo);
if (old_stream && new_stream) {
const SalStreamDescription *local_st_desc = sal_media_description_find_stream(call->localdesc, SalProtoRtpSavp, SalVideo);
int crypto_idx = find_crypto_index_from_tag(local_st_desc->crypto, new_stream->crypto_local_tag);
if (crypto_idx >= 0) {
video_stream_enable_strp(call->videostream, new_stream->crypto[0].algo, local_st_desc->crypto[crypto_idx].master_key, new_stream->crypto[0].master_key);
call->videostream_encrypted = TRUE;
} else {
ms_warning("Failed to find local crypto algo with tag: %d", new_stream->crypto_local_tag);
call->videostream_encrypted = FALSE;
}
for (i = 0; i < SAL_CRYPTO_ALGO_MAX; i++) {
old_stream->crypto[i].tag = new_stream->crypto[i].tag;
old_stream->crypto[i].algo = new_stream->crypto[i].algo;
strncpy(old_stream->crypto[i].master_key, new_stream->crypto[i].master_key, sizeof(old_stream->crypto[i].master_key) - 1);
}
}
#endif
}
void linphone_call_delete_ice_session(LinphoneCall *call){
if (call->ice_session != NULL) {
ice_session_destroy(call->ice_session);

1
coreapi/private.h
View file

@ -285,6 +285,7 @@ void linphone_call_stop_video_stream(LinphoneCall *call);
void linphone_call_stop_media_streams(LinphoneCall *call);
void linphone_call_delete_ice_session(LinphoneCall *call);
void linphone_call_stop_media_streams_for_ice_gathering(LinphoneCall *call);
void linphone_call_update_crypto_parameters(LinphoneCall *call, SalMediaDescription *old_md, SalMediaDescription *new_md);
const char * linphone_core_get_identity(LinphoneCore *lc);
const char * linphone_core_get_route(LinphoneCore *lc);

8
coreapi/sal.c
View file

@ -189,10 +189,18 @@ static bool_t payload_list_equals(const MSList *l1, const MSList *l2){
int sal_stream_description_equals(const SalStreamDescription *sd1, const SalStreamDescription *sd2) {
int result = SAL_MEDIA_DESCRIPTION_UNCHANGED;
int i;
/* A different proto should result in SAL_MEDIA_DESCRIPTION_NETWORK_CHANGED but the encryption change
needs a stream restart for now, so use SAL_MEDIA_DESCRIPTION_CODEC_CHANGED */
if (sd1->proto != sd2->proto) result |= SAL_MEDIA_DESCRIPTION_CODEC_CHANGED;
for (i = 0; i < SAL_CRYPTO_ALGO_MAX; i++) {
if ((sd1->crypto[i].tag != sd2->crypto[i].tag)
|| (sd1->crypto[i].algo != sd2->crypto[i].algo)
|| (strncmp(sd1->crypto[i].master_key, sd2->crypto[i].master_key, sizeof(sd1->crypto[i].master_key) - 1))) {
result |= SAL_MEDIA_DESCRIPTION_CRYPTO_CHANGED;
}
}
if (sd1->type != sd2->type) result |= SAL_MEDIA_DESCRIPTION_CODEC_CHANGED;
if (strcmp(sd1->rtp_addr, sd2->rtp_addr) != 0) result |= SAL_MEDIA_DESCRIPTION_NETWORK_CHANGED;

3
coreapi/sal.h
View file

@ -56,7 +56,8 @@ typedef enum {
#define SAL_MEDIA_DESCRIPTION_UNCHANGED 0x00
#define SAL_MEDIA_DESCRIPTION_NETWORK_CHANGED 0x01
#define SAL_MEDIA_DESCRIPTION_CODEC_CHANGED 0x02
#define SAL_MEDIA_DESCRIPTION_CHANGED (SAL_MEDIA_DESCRIPTION_NETWORK_CHANGED | SAL_MEDIA_DESCRIPTION_CODEC_CHANGED)
#define SAL_MEDIA_DESCRIPTION_CRYPTO_CHANGED 0x04
#define SAL_MEDIA_DESCRIPTION_CHANGED (SAL_MEDIA_DESCRIPTION_NETWORK_CHANGED | SAL_MEDIA_DESCRIPTION_CODEC_CHANGED | SAL_MEDIA_DESCRIPTION_CRYPTO_CHANGED)
const char* sal_transport_to_string(SalTransport transport);
SalTransport sal_transport_parse(const char*);