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Handle a case where a call can be bridged to a channel that is still ringing.

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The issue that was reported was about a case where a RINGING channel got 
redirected to an extension to pick up a call from parking.  Once the parked 
call got taken out of parking, it heard silence until the other side answered.  
Ideally, the caller that was parked would get a ringing indication.  This patch
fixes this case so that the caller receives ringback once it comes out of 
parking until the other side answers.

The fixes are:

 - Make sure we remember that a channel was an outgoing channel when doing 
   a masquerade.  This prevents an erroneous ast_answer() call on the channel,
   which causes a bogus 200 OK to be sent in the case of SIP.

 - Add some additional comments to explain related parts of code.

 - Update the handling of the ast_channel visible_indication field.  Storing 
   values that are not stateful is pointless.  Control frames that are events 
   or commands should be ignored.

 - When a bridge first starts, check to see if the peer channel needs to be 
   given ringing indication because the calling side is still ringing.

 - Rework ast_indicate_data() a bit for the sake of readability.

(closes issue #13747)
Reported by: davidw
Tested by: russell
Review: http://reviewboard.digium.com/r/90/


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@164201 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Russell Bryant
2008-12-15 14:31:37 +00:00
parent d8ff8d169d
commit 3a864cb7b6
2 changed files with 128 additions and 51 deletions
Download Patch File Download Diff File Expand all files Collapse all files

169
main/channel.c
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@@ -2448,65 +2448,126 @@ int ast_indicate(struct ast_channel *chan, int condition)
return ast_indicate_data(chan, condition, NULL, 0);
}
int ast_indicate_data(struct ast_channel *chan, int condition, const void *data, size_t datalen)
static int attribute_const is_visible_indication(enum ast_control_frame_type condition)
{
/* Don't include a default case here so that we get compiler warnings
* when a new type is added. */
switch (condition) {
case AST_CONTROL_PROGRESS:
case AST_CONTROL_PROCEEDING:
case AST_CONTROL_VIDUPDATE:
case AST_CONTROL_SRCUPDATE:
case AST_CONTROL_RADIO_KEY:
case AST_CONTROL_RADIO_UNKEY:
case AST_CONTROL_OPTION:
case AST_CONTROL_WINK:
case AST_CONTROL_FLASH:
case AST_CONTROL_OFFHOOK:
case AST_CONTROL_TAKEOFFHOOK:
case AST_CONTROL_ANSWER:
case AST_CONTROL_HANGUP:
return 0;
case AST_CONTROL_CONGESTION:
case AST_CONTROL_BUSY:
case AST_CONTROL_RINGING:
case AST_CONTROL_RING:
case AST_CONTROL_HOLD:
case AST_CONTROL_UNHOLD:
return 1;
}
return 0;
}
int ast_indicate_data(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;
const struct ind_tone_zone_sound *ts = NULL;
int res = -1;
ast_channel_lock(chan);
/* Stop if we're a zombie or need a soft hangup */
/* Don't bother if the channel is about to go away, anyway. */
if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan)) {
ast_channel_unlock(chan);
return -1;
}
if (chan->tech->indicate)
if (chan->tech->indicate) {
/* See if the channel driver can handle this condition. */
res = chan->tech->indicate(chan, condition, data, datalen);
}
ast_channel_unlock(chan);
if (!chan->tech->indicate || res) {
/*
* Device does not support (that) indication, lets fake
* it by doing our own tone generation. (PM2002)
*/
if (condition < 0)
ast_playtones_stop(chan);
else {
const struct ind_tone_zone_sound *ts = NULL;
switch (condition) {
case AST_CONTROL_RINGING:
ts = ast_get_indication_tone(chan->zone, "ring");
break;
case AST_CONTROL_BUSY:
ts = ast_get_indication_tone(chan->zone, "busy");
break;
case AST_CONTROL_CONGESTION:
ts = ast_get_indication_tone(chan->zone, "congestion");
break;
}
if (ts && ts->data[0]) {
if (option_debug)
ast_log(LOG_DEBUG, "Driver for channel '%s' does not support indication %d, emulating it\n", chan->name, condition);
ast_playtones_start(chan,0,ts->data, 1);
res = 0;
chan->visible_indication = condition;
} else if (condition == AST_CONTROL_PROGRESS) {
/* ast_playtones_stop(chan); */
} else if (condition == AST_CONTROL_PROCEEDING) {
/* Do nothing, really */
} else if (condition == AST_CONTROL_HOLD) {
/* Do nothing.... */
} else if (condition == AST_CONTROL_UNHOLD) {
/* Do nothing.... */
} else if (condition == AST_CONTROL_VIDUPDATE) {
/* Do nothing.... */
} else if (condition == AST_CONTROL_SRCUPDATE) {
/* Do nothing... */
} else {
/* not handled */
ast_log(LOG_WARNING, "Unable to handle indication %d for '%s'\n", condition, chan->name);
res = -1;
}
if (chan->tech->indicate && !res) {
/* The channel driver successfully handled this indication */
if (is_visible_indication(condition)) {
chan->visible_indication = condition;
}
} else
return 0;
}
/* The channel driver does not support this indication, let's fake
* it by doing our own tone generation if applicable. */
if (condition < 0) {
/* Stop any tones that are playing */
ast_playtones_stop(chan);
return 0;
}
/* Handle conditions that we have tones for. */
switch (condition) {
case AST_CONTROL_RINGING:
ts = ast_get_indication_tone(chan->zone, "ring");
break;
case AST_CONTROL_BUSY:
ts = ast_get_indication_tone(chan->zone, "busy");
break;
case AST_CONTROL_CONGESTION:
ts = ast_get_indication_tone(chan->zone, "congestion");
break;
case AST_CONTROL_PROGRESS:
case AST_CONTROL_PROCEEDING:
case AST_CONTROL_VIDUPDATE:
case AST_CONTROL_SRCUPDATE:
case AST_CONTROL_RADIO_KEY:
case AST_CONTROL_RADIO_UNKEY:
case AST_CONTROL_OPTION:
case AST_CONTROL_WINK:
case AST_CONTROL_FLASH:
case AST_CONTROL_OFFHOOK:
case AST_CONTROL_TAKEOFFHOOK:
case AST_CONTROL_ANSWER:
case AST_CONTROL_HANGUP:
case AST_CONTROL_RING:
case AST_CONTROL_HOLD:
case AST_CONTROL_UNHOLD:
/* Nothing left to do for these. */
res = 0;
break;
}
if (ts && ts->data[0]) {
/* We have a tone to play, yay. */
if (option_debug) {
ast_log(LOG_DEBUG, "Driver for channel '%s' does not support indication %d, emulating it\n", chan->name, condition);
}
ast_playtones_start(chan, 0, ts->data, 1);
res = 0;
chan->visible_indication = condition;
}
if (res) {
/* not handled */
ast_log(LOG_WARNING, "Unable to handle indication %d for '%s'\n", condition, chan->name);
}
return res;
}
@@ -3623,7 +3684,7 @@ int ast_do_masquerade(struct ast_channel *original)
/* XXX What about blocking, softhangup, blocker, and lock and blockproc? XXX */
/* Application and data remain the same */
/* Clone exception becomes real one, as with fdno */
ast_copy_flags(original, clone, AST_FLAG_EXCEPTION);
ast_copy_flags(original, clone, AST_FLAG_EXCEPTION | AST_FLAG_OUTGOING);
original->fdno = clone->fdno;
/* Schedule context remains the same */
/* Stream stuff stays the same */
@@ -3670,9 +3731,17 @@ int ast_do_masquerade(struct ast_channel *original)
ast_log(LOG_WARNING, "Channel type '%s' does not have a fixup routine (for %s)! Bad things may happen.\n",
original->tech->type, original->name);
/* If an indication is currently playing maintain it on the channel that is taking the place of original */
if (original->visible_indication)
/*
* If an indication is currently playing, maintain it on the channel
* that is taking the place of original
*
* This is needed because the masquerade is swapping out in the internals
* of this channel, and the new channel private data needs to be made
* aware of the current visible indication (RINGING, CONGESTION, etc.)
*/
if (original->visible_indication) {
ast_indicate(original, original->visible_indication);
}
/* Now, at this point, the "clone" channel is totally F'd up. We mark it as
a zombie so nothing tries to touch it. If it's already been marked as a