Merge "chan_pjsip: Relock correct channel during "fax" redirect." into 16
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commit
f9f17f3bfe
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@ -749,7 +749,8 @@ static int chan_pjsip_answer(struct ast_channel *ast)
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}
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/*! \brief Internal helper function called when CNG tone is detected */
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static struct ast_frame *chan_pjsip_cng_tone_detected(struct ast_sip_session *session, struct ast_frame *f)
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static struct ast_frame *chan_pjsip_cng_tone_detected(struct ast_channel *ast, struct ast_sip_session *session,
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struct ast_frame *f)
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{
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const char *target_context;
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int exists;
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@ -765,11 +766,11 @@ static struct ast_frame *chan_pjsip_cng_tone_detected(struct ast_sip_session *se
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}
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/* If already executing in the fax extension don't do anything */
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if (!strcmp(ast_channel_exten(session->channel), "fax")) {
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if (!strcmp(ast_channel_exten(ast), "fax")) {
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return f;
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}
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target_context = S_OR(ast_channel_macrocontext(session->channel), ast_channel_context(session->channel));
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target_context = S_OR(ast_channel_macrocontext(ast), ast_channel_context(ast));
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/*
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* We need to unlock the channel here because ast_exists_extension has the
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@ -778,25 +779,30 @@ static struct ast_frame *chan_pjsip_cng_tone_detected(struct ast_sip_session *se
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*
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* ast_async_goto() has its own restriction on not holding the channel lock.
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*/
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ast_channel_unlock(session->channel);
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ast_channel_unlock(ast);
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ast_frfree(f);
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f = &ast_null_frame;
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exists = ast_exists_extension(session->channel, target_context, "fax", 1,
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S_COR(ast_channel_caller(session->channel)->id.number.valid,
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ast_channel_caller(session->channel)->id.number.str, NULL));
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exists = ast_exists_extension(ast, target_context, "fax", 1,
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S_COR(ast_channel_caller(ast)->id.number.valid,
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ast_channel_caller(ast)->id.number.str, NULL));
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if (exists) {
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ast_verb(2, "Redirecting '%s' to fax extension due to CNG detection\n",
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ast_channel_name(session->channel));
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pbx_builtin_setvar_helper(session->channel, "FAXEXTEN", ast_channel_exten(session->channel));
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if (ast_async_goto(session->channel, target_context, "fax", 1)) {
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ast_channel_name(ast));
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pbx_builtin_setvar_helper(ast, "FAXEXTEN", ast_channel_exten(ast));
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if (ast_async_goto(ast, target_context, "fax", 1)) {
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ast_log(LOG_ERROR, "Failed to async goto '%s' into fax extension in '%s'\n",
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ast_channel_name(session->channel), target_context);
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ast_channel_name(ast), target_context);
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}
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} else {
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ast_log(LOG_NOTICE, "FAX CNG detected on '%s' but no fax extension in '%s'\n",
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ast_channel_name(session->channel), target_context);
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ast_channel_name(ast), target_context);
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}
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ast_channel_lock(session->channel);
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/* It's possible for a masquerade to have occurred when doing the ast_async_goto resulting in
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* the channel on the session having changed. Since we need to return with the original channel
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* locked we lock the channel that was passed in and not session->channel.
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*/
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ast_channel_lock(ast);
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return f;
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}
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@ -895,7 +901,11 @@ static struct ast_frame *chan_pjsip_read_stream(struct ast_channel *ast)
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if (f->subclass.integer == 'f') {
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ast_debug(3, "Channel driver fax CNG detected on %s\n",
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ast_channel_name(ast));
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f = chan_pjsip_cng_tone_detected(session, f);
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f = chan_pjsip_cng_tone_detected(ast, session, f);
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/* When chan_pjsip_cng_tone_detected returns it is possible for the
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* channel pointed to by ast and by session->channel to differ due to a
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* masquerade. It's best not to touch things after this.
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*/
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} else {
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ast_debug(3, "* Detected inband DTMF '%c' on '%s'\n", f->subclass.integer,
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ast_channel_name(ast));
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