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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 1999 - 2006, Digium, Inc.
*
* Mark Spencer <markster@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
*
* \brief Automatic channel service routines
*
* \author Mark Spencer <markster@digium.com>
*/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <signal.h>
#include <errno.h>
#include <unistd.h>
#include "asterisk/pbx.h"
#include "asterisk/frame.h"
#include "asterisk/sched.h"
#include "asterisk/options.h"
#include "asterisk/channel.h"
#include "asterisk/logger.h"
#include "asterisk/file.h"
#include "asterisk/translate.h"
#include "asterisk/manager.h"
#include "asterisk/chanvars.h"
#include "asterisk/linkedlists.h"
#include "asterisk/indications.h"
#include "asterisk/lock.h"
#include "asterisk/utils.h"
#define MAX_AUTOMONS 256
struct asent {
struct ast_channel *chan;
/*! This gets incremented each time autoservice gets started on the same
* channel. It will ensure that it doesn't actually get stopped until
* it gets stopped for the last time. */
unsigned int use_count;
AST_LIST_HEAD_NOLOCK(, ast_frame) dtmf_frames;
AST_LIST_ENTRY(asent) list;
};
static AST_LIST_HEAD_STATIC(aslist, asent);
static pthread_t asthread = AST_PTHREADT_NULL;
static void defer_frame(struct ast_channel *chan, struct ast_frame *f)
{
struct ast_frame *dup_f;
struct asent *as;
AST_LIST_LOCK(&aslist);
AST_LIST_TRAVERSE(&aslist, as, list) {
if (as->chan != chan)
continue;
if ((dup_f = ast_frdup(f)))
AST_LIST_INSERT_TAIL(&as->dtmf_frames, dup_f, frame_list);
}
AST_LIST_UNLOCK(&aslist);
}
static void *autoservice_run(void *ign)
{
for (;;) {
struct ast_channel *mons[MAX_AUTOMONS];
struct ast_channel *chan;
struct asent *as;
int x = 0, ms = 500;
AST_LIST_LOCK(&aslist);
AST_LIST_TRAVERSE(&aslist, as, list) {
if (!as->chan->_softhangup) {
if (x < MAX_AUTOMONS)
mons[x++] = as->chan;
else
ast_log(LOG_WARNING, "Exceeded maximum number of automatic monitoring events. Fix autoservice.c\n");
}
}
AST_LIST_UNLOCK(&aslist);
chan = ast_waitfor_n(mons, x, &ms);
if (chan) {
struct ast_frame *f = ast_read(chan);
if (!f) {
struct ast_frame hangup_frame = { 0, };
/* No frame means the channel has been hung up.
* A hangup frame needs to be queued here as ast_waitfor() may
* never return again for the condition to be detected outside
* of autoservice. So, we'll leave a HANGUP queued up so the
* thread in charge of this channel will know. */
hangup_frame.frametype = AST_FRAME_CONTROL;
hangup_frame.subclass = AST_CONTROL_HANGUP;
defer_frame(chan, &hangup_frame);
continue;
}
/* Do not add a default entry in this switch statement. Each new
* frame type should be addressed directly as to whether it should
* be queued up or not. */
switch (f->frametype) {
/* Save these frames */
case AST_FRAME_DTMF_BEGIN:
case AST_FRAME_DTMF_END:
case AST_FRAME_CONTROL:
case AST_FRAME_TEXT:
case AST_FRAME_IMAGE:
case AST_FRAME_HTML:
defer_frame(chan, f);
break;
/* Throw these frames away */
case AST_FRAME_VOICE:
case AST_FRAME_VIDEO:
case AST_FRAME_NULL:
case AST_FRAME_IAX:
case AST_FRAME_CNG:
case AST_FRAME_MODEM:
break;
}
if (f)
ast_frfree(f);
}
}
asthread = AST_PTHREADT_NULL;
return NULL;
}
int ast_autoservice_start(struct ast_channel *chan)
{
int res = 0;
struct asent *as;
AST_LIST_LOCK(&aslist);
/* Check if the channel already has autoservice */
AST_LIST_TRAVERSE(&aslist, as, list) {
if (as->chan == chan) {
as->use_count++;
break;
}
}
/* If not, start autoservice on channel */
if (as) {
/* Entry extist, autoservice is already handling this channel */
} else if ((as = ast_calloc(1, sizeof(*as))) == NULL) {
/* Memory allocation failed */
res = -1;
} else {
/* New entry created */
as->chan = chan;
as->use_count = 1;
AST_LIST_INSERT_HEAD(&aslist, as, list);
if (asthread == AST_PTHREADT_NULL) { /* need start the thread */
if (ast_pthread_create_background(&asthread, NULL, autoservice_run, NULL)) {
ast_log(LOG_WARNING, "Unable to create autoservice thread :(\n");
/* There will only be a single member in the list at this point,
the one we just added. */
AST_LIST_REMOVE(&aslist, as, list);
free(as);
res = -1;
} else
pthread_kill(asthread, SIGURG);
}
}
AST_LIST_UNLOCK(&aslist);
return res;
}
int ast_autoservice_stop(struct ast_channel *chan)
{
int res = -1;
struct asent *as;
AST_LIST_HEAD_NOLOCK(, ast_frame) dtmf_frames;
struct ast_frame *f;
int removed = 0;
AST_LIST_HEAD_INIT_NOLOCK(&dtmf_frames);
AST_LIST_LOCK(&aslist);
AST_LIST_TRAVERSE_SAFE_BEGIN(&aslist, as, list) {
if (as->chan == chan) {
as->use_count--;
if (as->use_count)
break;
AST_LIST_REMOVE_CURRENT(&aslist, list);
AST_LIST_APPEND_LIST(&dtmf_frames, &as->dtmf_frames, frame_list);
free(as);
removed = 1;
if (!chan->_softhangup)
res = 0;
break;
}
}
AST_LIST_TRAVERSE_SAFE_END
if (removed && asthread != AST_PTHREADT_NULL)
pthread_kill(asthread, SIGURG);
AST_LIST_UNLOCK(&aslist);
if (!removed)
return 0;
/* Wait for it to un-block */
while (ast_test_flag(chan, AST_FLAG_BLOCKING))
usleep(1000);
while ((f = AST_LIST_REMOVE_HEAD(&dtmf_frames, frame_list))) {
ast_queue_frame(chan, f);
ast_frfree(f);
}
return res;
}
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