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channel.c: Route all control frames to a channel through the same code.

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Frame hooks can conceivably return a control frame in exchange for an
audio frame inside ast_write().  Those returned control frames were not
handled quite the same as if they were sent to ast_indicate().  Now it
doesn't matter if you use ast_write() to send an AST_FRAME_CONTROL to a
channel or ast_indicate().

ASTERISK-25582

Change-Id: I5775f41421aca2b510128198e9b827bf9169629b
This commit is contained in:
Richard Mudgett
2016-02-22 12:15:34 -06:00
parent d35c494df1
commit 7c4495cb70
1 changed files with 68 additions and 53 deletions
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121
main/channel.c
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@@ -4473,67 +4473,30 @@ static int indicate_redirecting(struct ast_channel *chan, const void *data, size
return res ? -1 : 0;
}
int ast_indicate_data(struct ast_channel *chan, int _condition,
const void *data, size_t datalen)
static int indicate_data_internal(struct ast_channel *chan, int _condition, const void *data, size_t datalen)
{
/* By using an enum, we'll get compiler warnings for values not handled
* in switch statements. */
enum ast_control_frame_type condition = _condition;
struct ast_tone_zone_sound *ts = NULL;
int res;
/* this frame is used by framehooks. if it is set, we must free it at the end of this function */
struct ast_frame *awesome_frame = NULL;
ast_channel_lock(chan);
/* Don't bother if the channel is about to go away, anyway. */
if ((ast_test_flag(ast_channel_flags(chan), AST_FLAG_ZOMBIE)
|| (ast_check_hangup(chan) && !ast_channel_is_leaving_bridge(chan)))
&& condition != AST_CONTROL_MASQUERADE_NOTIFY) {
res = -1;
goto indicate_cleanup;
}
if (!ast_framehook_list_is_empty(ast_channel_framehooks(chan))) {
/* Do framehooks now, do it, go, go now */
struct ast_frame frame = {
.frametype = AST_FRAME_CONTROL,
.subclass.integer = condition,
.data.ptr = (void *) data, /* this cast from const is only okay because we do the ast_frdup below */
.datalen = datalen
};
/* we have now committed to freeing this frame */
awesome_frame = ast_frdup(&frame);
/* who knows what we will get back! the anticipation is killing me. */
if (!(awesome_frame = ast_framehook_list_write_event(ast_channel_framehooks(chan), awesome_frame))
|| awesome_frame->frametype != AST_FRAME_CONTROL) {
res = 0;
goto indicate_cleanup;
}
condition = awesome_frame->subclass.integer;
data = awesome_frame->data.ptr;
datalen = awesome_frame->datalen;
}
switch (condition) {
case AST_CONTROL_CONNECTED_LINE:
if (indicate_connected_line(chan, data, datalen)) {
res = 0;
goto indicate_cleanup;
return res;
}
break;
case AST_CONTROL_REDIRECTING:
if (indicate_redirecting(chan, data, datalen)) {
res = 0;
goto indicate_cleanup;
return res;
}
break;
case AST_CONTROL_HOLD:
case AST_CONTROL_UNHOLD:
ast_channel_hold_state_set(chan, condition);
ast_channel_hold_state_set(chan, _condition);
break;
default:
break;
@@ -4541,7 +4504,7 @@ int ast_indicate_data(struct ast_channel *chan, int _condition,
if (is_visible_indication(condition)) {
/* A new visible indication is requested. */
ast_channel_visible_indication_set(chan, condition);
ast_channel_visible_indication_set(chan, _condition);
} else if (condition == AST_CONTROL_UNHOLD || _condition < 0) {
/* Visible indication is cleared/stopped. */
ast_channel_visible_indication_set(chan, 0);
@@ -4549,7 +4512,7 @@ int ast_indicate_data(struct ast_channel *chan, int _condition,
if (ast_channel_tech(chan)->indicate) {
/* See if the channel driver can handle this condition. */
res = ast_channel_tech(chan)->indicate(chan, condition, data, datalen);
res = ast_channel_tech(chan)->indicate(chan, _condition, data, datalen);
} else {
res = -1;
}
@@ -4557,7 +4520,7 @@ int ast_indicate_data(struct ast_channel *chan, int _condition,
if (!res) {
/* The channel driver successfully handled this indication */
res = 0;
goto indicate_cleanup;
return res;
}
/* The channel driver does not support this indication, let's fake
@@ -4570,7 +4533,7 @@ int ast_indicate_data(struct ast_channel *chan, int _condition,
/* Stop any tones that are playing */
ast_playtones_stop(chan);
res = 0;
goto indicate_cleanup;
return res;
}
/* Handle conditions that we have tones for. */
@@ -4578,7 +4541,7 @@ int ast_indicate_data(struct ast_channel *chan, int _condition,
case _XXX_AST_CONTROL_T38:
/* deprecated T.38 control frame */
res = -1;
goto indicate_cleanup;
return res;
case AST_CONTROL_T38_PARAMETERS:
/* there is no way to provide 'default' behavior for these
* control frames, so we need to return failure, but there
@@ -4587,7 +4550,7 @@ int ast_indicate_data(struct ast_channel *chan, int _condition,
* so just return right now. in addition, we want to return
* whatever value the channel driver returned, in case it
* has some meaning.*/
goto indicate_cleanup;
return res;
case AST_CONTROL_RINGING:
ts = ast_get_indication_tone(ast_channel_zone(chan), "ring");
/* It is common practice for channel drivers to return -1 if trying
@@ -4670,6 +4633,53 @@ int ast_indicate_data(struct ast_channel *chan, int _condition,
ast_log(LOG_WARNING, "Unable to handle indication %u for '%s'\n", condition, ast_channel_name(chan));
}
return res;
}
int ast_indicate_data(struct ast_channel *chan, int _condition, const void *data, size_t datalen)
{
int res;
/* this frame is used by framehooks. if it is set, we must free it at the end of this function */
struct ast_frame *awesome_frame = NULL;
ast_channel_lock(chan);
/* Don't bother if the channel is about to go away, anyway. */
if ((ast_test_flag(ast_channel_flags(chan), AST_FLAG_ZOMBIE)
|| (ast_check_hangup(chan) && !ast_channel_is_leaving_bridge(chan)))
&& _condition != AST_CONTROL_MASQUERADE_NOTIFY) {
res = -1;
goto indicate_cleanup;
}
if (!ast_framehook_list_is_empty(ast_channel_framehooks(chan))) {
/* Do framehooks now, do it, go, go now */
struct ast_frame frame = {
.frametype = AST_FRAME_CONTROL,
.subclass.integer = _condition,
.data.ptr = (void *) data, /* this cast from const is only okay because we do the ast_frdup below */
.datalen = datalen
};
/* we have now committed to freeing this frame */
awesome_frame = ast_frdup(&frame);
/* who knows what we will get back! the anticipation is killing me. */
awesome_frame = ast_framehook_list_write_event(ast_channel_framehooks(chan),
awesome_frame);
if (!awesome_frame
|| awesome_frame->frametype != AST_FRAME_CONTROL) {
res = 0;
goto indicate_cleanup;
}
_condition = awesome_frame->subclass.integer;
data = awesome_frame->data.ptr;
datalen = awesome_frame->datalen;
}
res = indicate_data_internal(chan, _condition, data, datalen);
indicate_cleanup:
ast_channel_unlock(chan);
if (awesome_frame) {
@@ -5012,10 +5022,15 @@ int ast_write(struct ast_channel *chan, struct ast_frame *fr)
res = ast_senddigit_end(chan, fr->subclass.integer, fr->len);
ast_channel_lock(chan);
CHECK_BLOCKING(chan);
} else if (fr->frametype == AST_FRAME_CONTROL && fr->subclass.integer == AST_CONTROL_UNHOLD) {
/* This is a side case where Echo is basically being called and the person put themselves on hold and took themselves off hold */
res = (ast_channel_tech(chan)->indicate == NULL) ? 0 :
ast_channel_tech(chan)->indicate(chan, fr->subclass.integer, fr->data.ptr, fr->datalen);
} else if (fr->frametype == AST_FRAME_CONTROL
&& fr->subclass.integer == AST_CONTROL_UNHOLD) {
/*
* This is a side case where Echo is basically being called
* and the person put themselves on hold and took themselves
* off hold.
*/
indicate_data_internal(chan, fr->subclass.integer, fr->data.ptr,
fr->datalen);
}
res = 0; /* XXX explain, why 0 ? */
goto done;
@@ -5027,8 +5042,8 @@ int ast_write(struct ast_channel *chan, struct ast_frame *fr)
CHECK_BLOCKING(chan);
switch (fr->frametype) {
case AST_FRAME_CONTROL:
res = (ast_channel_tech(chan)->indicate == NULL) ? 0 :
ast_channel_tech(chan)->indicate(chan, fr->subclass.integer, fr->data.ptr, fr->datalen);
indicate_data_internal(chan, fr->subclass.integer, fr->data.ptr, fr->datalen);
res = 0;
break;
case AST_FRAME_DTMF_BEGIN:
if (ast_channel_audiohooks(chan)) {