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Merge "chan_pjsip: Relock correct channel during "fax" redirect." into 16

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Friendly Automation
2019-09-18 07:39:25 -05:00
committed by Gerrit Code Review
parent 51e315765b 49e1346185
commit f9f17f3bfe
1 changed files with 24 additions and 14 deletions
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38
channels/chan_pjsip.c
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@@ -749,7 +749,8 @@ static int chan_pjsip_answer(struct ast_channel *ast)
} }
/*! \brief Internal helper function called when CNG tone is detected */ /*! \brief Internal helper function called when CNG tone is detected */
static struct ast_frame *chan_pjsip_cng_tone_detected(struct ast_sip_session *session, struct ast_frame *f) static struct ast_frame *chan_pjsip_cng_tone_detected(struct ast_channel *ast, struct ast_sip_session *session,
struct ast_frame *f)
{ {
const char *target_context; const char *target_context;
int exists; int exists;
@@ -765,11 +766,11 @@ static struct ast_frame *chan_pjsip_cng_tone_detected(struct ast_sip_session *se
} }
/* If already executing in the fax extension don't do anything */ /* If already executing in the fax extension don't do anything */
if (!strcmp(ast_channel_exten(session->channel), "fax")) { if (!strcmp(ast_channel_exten(ast), "fax")) {
return f; return f;
} }
target_context = S_OR(ast_channel_macrocontext(session->channel), ast_channel_context(session->channel)); target_context = S_OR(ast_channel_macrocontext(ast), ast_channel_context(ast));
/* /*
* We need to unlock the channel here because ast_exists_extension has the * We need to unlock the channel here because ast_exists_extension has the
@@ -778,25 +779,30 @@ static struct ast_frame *chan_pjsip_cng_tone_detected(struct ast_sip_session *se
* *
* ast_async_goto() has its own restriction on not holding the channel lock. * ast_async_goto() has its own restriction on not holding the channel lock.
*/ */
ast_channel_unlock(session->channel); ast_channel_unlock(ast);
ast_frfree(f); ast_frfree(f);
f = &ast_null_frame; f = &ast_null_frame;
exists = ast_exists_extension(session->channel, target_context, "fax", 1, exists = ast_exists_extension(ast, target_context, "fax", 1,
S_COR(ast_channel_caller(session->channel)->id.number.valid, S_COR(ast_channel_caller(ast)->id.number.valid,
ast_channel_caller(session->channel)->id.number.str, NULL)); ast_channel_caller(ast)->id.number.str, NULL));
if (exists) { if (exists) {
ast_verb(2, "Redirecting '%s' to fax extension due to CNG detection\n", ast_verb(2, "Redirecting '%s' to fax extension due to CNG detection\n",
ast_channel_name(session->channel)); ast_channel_name(ast));
pbx_builtin_setvar_helper(session->channel, "FAXEXTEN", ast_channel_exten(session->channel)); pbx_builtin_setvar_helper(ast, "FAXEXTEN", ast_channel_exten(ast));
if (ast_async_goto(session->channel, target_context, "fax", 1)) { if (ast_async_goto(ast, target_context, "fax", 1)) {
ast_log(LOG_ERROR, "Failed to async goto '%s' into fax extension in '%s'\n", ast_log(LOG_ERROR, "Failed to async goto '%s' into fax extension in '%s'\n",
ast_channel_name(session->channel), target_context); ast_channel_name(ast), target_context);
} }
} else { } else {
ast_log(LOG_NOTICE, "FAX CNG detected on '%s' but no fax extension in '%s'\n", ast_log(LOG_NOTICE, "FAX CNG detected on '%s' but no fax extension in '%s'\n",
ast_channel_name(session->channel), target_context); ast_channel_name(ast), target_context);
} }
ast_channel_lock(session->channel);
/* It's possible for a masquerade to have occurred when doing the ast_async_goto resulting in
* the channel on the session having changed. Since we need to return with the original channel
* locked we lock the channel that was passed in and not session->channel.
*/
ast_channel_lock(ast);
return f; return f;
} }
@@ -895,7 +901,11 @@ static struct ast_frame *chan_pjsip_read_stream(struct ast_channel *ast)
if (f->subclass.integer == 'f') { if (f->subclass.integer == 'f') {
ast_debug(3, "Channel driver fax CNG detected on %s\n", ast_debug(3, "Channel driver fax CNG detected on %s\n",
ast_channel_name(ast)); ast_channel_name(ast));
f = chan_pjsip_cng_tone_detected(session, f); f = chan_pjsip_cng_tone_detected(ast, session, f);
/* When chan_pjsip_cng_tone_detected returns it is possible for the
* channel pointed to by ast and by session->channel to differ due to a
* masquerade. It's best not to touch things after this.
*/
} else { } else {
ast_debug(3, "* Detected inband DTMF '%c' on '%s'\n", f->subclass.integer, ast_debug(3, "* Detected inband DTMF '%c' on '%s'\n", f->subclass.integer,
ast_channel_name(ast)); ast_channel_name(ast));