git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@2085 65c4cc65-6c06-0410-ace0-fbb531ad65f3
536 lines
13 KiB
C
Executable file
536 lines
13 KiB
C
Executable file
/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* Local Proxy Channel
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*
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* Copyright (C) 1999, Mark Spencer
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*
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* Mark Spencer <markster@linux-support.net>
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License
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*/
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#include <stdio.h>
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#include <pthread.h>
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#include <string.h>
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#include <asterisk/lock.h>
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#include <asterisk/channel.h>
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#include <asterisk/channel_pvt.h>
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#include <asterisk/config.h>
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#include <asterisk/logger.h>
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#include <asterisk/module.h>
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#include <asterisk/pbx.h>
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#include <asterisk/options.h>
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#include <asterisk/lock.h>
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#include <asterisk/sched.h>
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#include <asterisk/io.h>
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#include <asterisk/rtp.h>
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#include <asterisk/acl.h>
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#include <asterisk/callerid.h>
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#include <asterisk/file.h>
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#include <asterisk/cli.h>
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#include <asterisk/app.h>
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#include <asterisk/musiconhold.h>
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#include <asterisk/manager.h>
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#include <sys/socket.h>
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#include <errno.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <netdb.h>
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#include <arpa/inet.h>
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#include <sys/signal.h>
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static char *desc = "Local Proxy Channel";
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static char *type = "Local";
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static char *tdesc = "Local Proxy Channel Driver";
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static int capability = -1;
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static int usecnt =0;
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static ast_mutex_t usecnt_lock = AST_MUTEX_INITIALIZER;
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#define IS_OUTBOUND(a,b) (a == b->chan ? 1 : 0)
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/* Protect the interface list (of sip_pvt's) */
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static ast_mutex_t locallock = AST_MUTEX_INITIALIZER;
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static struct local_pvt {
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ast_mutex_t lock; /* Channel private lock */
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char context[AST_MAX_EXTENSION]; /* Context to call */
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char exten[AST_MAX_EXTENSION]; /* Extension to call */
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int reqformat; /* Requested format */
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int glaredetect; /* Detect glare on hangup */
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int cancelqueue; /* Cancel queue */
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int alreadymasqed; /* Already masqueraded */
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int launchedpbx; /* Did we launch the PBX */
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int nooptimization;
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struct ast_channel *owner; /* Master Channel */
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struct ast_channel *chan; /* Outbound channel */
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struct local_pvt *next; /* Next entity */
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} *locals = NULL;
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static int local_queue_frame(struct local_pvt *p, int isoutbound, struct ast_frame *f, struct ast_channel *us)
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{
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struct ast_channel *other;
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retrylock:
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/* Recalculate outbound channel */
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if (isoutbound) {
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other = p->owner;
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} else {
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other = p->chan;
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}
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/* Set glare detection */
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p->glaredetect = 1;
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if (p->cancelqueue) {
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/* We had a glare on the hangup. Forget all this business,
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return and destroy p. */
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ast_mutex_unlock(&p->lock);
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free(p);
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return -1;
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}
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if (!other) {
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p->glaredetect = 0;
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return 0;
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}
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if (ast_mutex_trylock(&other->lock)) {
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/* Failed to lock. Release main lock and try again */
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ast_mutex_unlock(&p->lock);
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if (us) {
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if (ast_mutex_unlock(&us->lock)) {
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ast_log(LOG_WARNING, "%s wasn't locked while sending %d/%d\n",
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us->name, f->frametype, f->subclass);
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us = NULL;
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}
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}
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/* Wait just a bit */
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usleep(1);
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/* Only we can destroy ourselves, so we can't disappear here */
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if (us)
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ast_mutex_lock(&us->lock);
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ast_mutex_lock(&p->lock);
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goto retrylock;
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}
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ast_queue_frame(other, f, 0);
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ast_mutex_unlock(&other->lock);
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p->glaredetect = 0;
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return 0;
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}
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static int local_answer(struct ast_channel *ast)
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{
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struct local_pvt *p = ast->pvt->pvt;
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int isoutbound = IS_OUTBOUND(ast, p);
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int res = -1;
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ast_mutex_lock(&p->lock);
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if (isoutbound) {
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/* Pass along answer since somebody answered us */
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struct ast_frame answer = { AST_FRAME_CONTROL, AST_CONTROL_ANSWER };
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res = local_queue_frame(p, isoutbound, &answer, ast);
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} else
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ast_log(LOG_WARNING, "Huh? Local is being asked to answer?\n");
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ast_mutex_unlock(&p->lock);
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return res;
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}
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static void check_bridge(struct local_pvt *p, int isoutbound)
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{
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if (p->alreadymasqed || p->nooptimization)
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return;
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if (isoutbound && p->chan && p->chan->bridge && p->owner) {
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/* Masquerade bridged channel into owner */
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/* Lock everything we need, one by one, and give up if
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we can't get everything. Remember, we'll get another
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chance in just a little bit */
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if (!ast_mutex_trylock(&p->chan->bridge->lock)) {
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if (!ast_mutex_trylock(&p->owner->lock)) {
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ast_channel_masquerade(p->owner, p->chan->bridge);
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p->alreadymasqed = 1;
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ast_mutex_unlock(&p->owner->lock);
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}
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ast_mutex_unlock(&p->chan->bridge->lock);
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}
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} else if (!isoutbound && p->owner && p->owner->bridge && p->chan) {
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/* Masquerade bridged channel into chan */
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if (!ast_mutex_trylock(&p->owner->bridge->lock)) {
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if (!ast_mutex_trylock(&p->chan->lock)) {
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ast_channel_masquerade(p->chan, p->owner->bridge);
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p->alreadymasqed = 1;
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ast_mutex_unlock(&p->chan->lock);
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}
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ast_mutex_unlock(&p->owner->bridge->lock);
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}
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}
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}
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static struct ast_frame *local_read(struct ast_channel *ast)
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{
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static struct ast_frame null = { AST_FRAME_NULL, };
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return &null;
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}
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static int local_write(struct ast_channel *ast, struct ast_frame *f)
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{
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struct local_pvt *p = ast->pvt->pvt;
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int res = -1;
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int isoutbound = IS_OUTBOUND(ast, p);
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/* Just queue for delivery to the other side */
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ast_mutex_lock(&p->lock);
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res = local_queue_frame(p, isoutbound, f, ast);
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check_bridge(p, isoutbound);
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ast_mutex_unlock(&p->lock);
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return res;
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}
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static int local_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
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{
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struct local_pvt *p = newchan->pvt->pvt;
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ast_mutex_lock(&p->lock);
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if ((p->owner != oldchan) && (p->chan != oldchan)) {
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ast_log(LOG_WARNING, "old channel wasn't %p but was %p/%p\n", oldchan, p->owner, p->chan);
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ast_mutex_unlock(&p->lock);
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return -1;
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}
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if (p->owner == oldchan)
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p->owner = newchan;
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else
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p->chan = newchan;
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ast_mutex_unlock(&p->lock);
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return 0;
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}
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static int local_indicate(struct ast_channel *ast, int condition)
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{
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struct local_pvt *p = ast->pvt->pvt;
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int res = -1;
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struct ast_frame f = { AST_FRAME_CONTROL, };
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int isoutbound = IS_OUTBOUND(ast, p);
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/* Queue up a frame representing the indication as a control frame */
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ast_mutex_lock(&p->lock);
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f.subclass = condition;
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res = local_queue_frame(p, isoutbound, &f, ast);
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ast_mutex_unlock(&p->lock);
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return res;
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}
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static int local_digit(struct ast_channel *ast, char digit)
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{
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struct local_pvt *p = ast->pvt->pvt;
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int res = -1;
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struct ast_frame f = { AST_FRAME_DTMF, };
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int isoutbound = IS_OUTBOUND(ast, p);
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ast_mutex_lock(&p->lock);
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f.subclass = digit;
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res = local_queue_frame(p, isoutbound, &f, ast);
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ast_mutex_unlock(&p->lock);
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return res;
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}
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static int local_call(struct ast_channel *ast, char *dest, int timeout)
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{
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struct local_pvt *p = ast->pvt->pvt;
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int res;
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ast_mutex_lock(&p->lock);
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if (p->owner->callerid)
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p->chan->callerid = strdup(p->owner->callerid);
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else
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p->chan->callerid = NULL;
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if (p->owner->ani)
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p->chan->ani = strdup(p->owner->ani);
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else
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p->chan->ani = NULL;
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p->launchedpbx = 1;
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/* Start switch on sub channel */
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res = ast_pbx_start(p->chan);
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ast_mutex_unlock(&p->lock);
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return res;
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}
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/*
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static void local_destroy(struct local_pvt *p)
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{
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struct local_pvt *cur, *prev = NULL;
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ast_mutex_lock(&locallock);
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cur = locals;
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while(cur) {
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if (cur == p) {
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if (prev)
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prev->next = cur->next;
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else
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locals = cur->next;
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free(cur);
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break;
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}
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prev = cur;
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cur = cur->next;
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}
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ast_mutex_unlock(&locallock);
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if (!cur)
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ast_log(LOG_WARNING, "Unable ot find local '%s@%s' in local list\n", p->exten, p->context);
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}
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*/
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static int local_hangup(struct ast_channel *ast)
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{
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struct local_pvt *p = ast->pvt->pvt;
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int isoutbound = IS_OUTBOUND(ast, p);
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struct ast_frame f = { AST_FRAME_CONTROL, AST_CONTROL_HANGUP };
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struct local_pvt *cur, *prev=NULL;
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struct ast_channel *ochan = NULL;
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int glaredetect;
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ast_mutex_lock(&p->lock);
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if (isoutbound) {
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p->chan = NULL;
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p->launchedpbx = 0;
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} else
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p->owner = NULL;
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ast->pvt->pvt = NULL;
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if (!p->owner && !p->chan) {
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/* Okay, done with the private part now, too. */
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glaredetect = p->glaredetect;
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/* If we have a queue holding, don't actually destroy p yet, but
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let local_queue do it. */
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if (p->glaredetect)
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p->cancelqueue = 1;
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ast_mutex_unlock(&p->lock);
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/* Remove from list */
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ast_mutex_lock(&locallock);
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cur = locals;
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while(cur) {
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if (cur == p) {
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if (prev)
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prev->next = cur->next;
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else
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locals = cur->next;
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break;
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}
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prev = cur;
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cur = cur->next;
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}
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ast_mutex_unlock(&locallock);
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/* And destroy */
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if (!glaredetect)
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free(p);
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return 0;
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}
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if (p->chan && !p->launchedpbx)
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/* Need to actually hangup since there is no PBX */
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ochan = p->chan;
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else
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local_queue_frame(p, isoutbound, &f, NULL);
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ast_mutex_unlock(&p->lock);
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if (ochan)
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ast_hangup(ochan);
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return 0;
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}
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static struct local_pvt *local_alloc(char *data, int format)
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{
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struct local_pvt *tmp;
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char *c;
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char *opts;
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tmp = malloc(sizeof(struct local_pvt));
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if (tmp) {
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memset(tmp, 0, sizeof(struct local_pvt));
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ast_mutex_init(&tmp->lock);
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strncpy(tmp->exten, data, sizeof(tmp->exten) - 1);
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opts = strchr(tmp->exten, '/');
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if (opts) {
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*opts='\0';
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opts++;
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if (strchr(opts, 'n'))
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tmp->nooptimization = 1;
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}
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c = strchr(tmp->exten, '@');
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if (c) {
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*c = '\0';
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c++;
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strncpy(tmp->context, c, sizeof(tmp->context) - 1);
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} else
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strncpy(tmp->context, "default", sizeof(tmp->context) - 1);
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tmp->reqformat = format;
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if (!ast_exists_extension(NULL, tmp->context, tmp->exten, 1, NULL)) {
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ast_log(LOG_NOTICE, "No such extension/context %s@%s creating local channel\n", tmp->context, tmp->exten);
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free(tmp);
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tmp = NULL;
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} else {
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/* Add to list */
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ast_mutex_lock(&locallock);
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tmp->next = locals;
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locals = tmp;
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ast_mutex_unlock(&locallock);
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}
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}
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return tmp;
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}
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static struct ast_channel *local_new(struct local_pvt *p, int state)
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{
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struct ast_channel *tmp, *tmp2;
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int randnum = rand() & 0xffff;
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tmp = ast_channel_alloc(1);
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tmp2 = ast_channel_alloc(1);
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if (!tmp || !tmp2) {
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if (tmp)
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ast_channel_free(tmp);
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if (tmp2)
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ast_channel_free(tmp2);
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tmp = NULL;
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}
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if (tmp) {
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tmp->nativeformats = p->reqformat;
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tmp2->nativeformats = p->reqformat;
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snprintf(tmp->name, sizeof(tmp->name), "Local/%s@%s-%04x,1", p->exten, p->context, randnum);
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snprintf(tmp2->name, sizeof(tmp2->name), "Local/%s@%s-%04x,2", p->exten, p->context, randnum);
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tmp->type = type;
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tmp2->type = type;
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ast_setstate(tmp, state);
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ast_setstate(tmp2, AST_STATE_RING);
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tmp->writeformat = p->reqformat;;
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tmp2->writeformat = p->reqformat;
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tmp->pvt->rawwriteformat = p->reqformat;
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tmp2->pvt->rawwriteformat = p->reqformat;
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tmp->readformat = p->reqformat;
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tmp2->readformat = p->reqformat;
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tmp->pvt->rawreadformat = p->reqformat;
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tmp2->pvt->rawreadformat = p->reqformat;
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tmp->pvt->pvt = p;
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tmp2->pvt->pvt = p;
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tmp->pvt->send_digit = local_digit;
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tmp2->pvt->send_digit = local_digit;
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tmp->pvt->call = local_call;
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tmp2->pvt->call = local_call;
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tmp->pvt->hangup = local_hangup;
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tmp2->pvt->hangup = local_hangup;
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tmp->pvt->answer = local_answer;
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tmp2->pvt->answer = local_answer;
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tmp->pvt->read = local_read;
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tmp2->pvt->read = local_read;
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tmp->pvt->write = local_write;
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tmp2->pvt->write = local_write;
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tmp->pvt->exception = local_read;
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tmp2->pvt->exception = local_read;
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tmp->pvt->indicate = local_indicate;
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tmp2->pvt->indicate = local_indicate;
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tmp->pvt->fixup = local_fixup;
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tmp2->pvt->fixup = local_fixup;
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p->owner = tmp;
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p->chan = tmp2;
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ast_mutex_lock(&usecnt_lock);
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usecnt++;
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ast_mutex_unlock(&usecnt_lock);
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ast_update_use_count();
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strncpy(tmp->context, p->context, sizeof(tmp->context)-1);
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strncpy(tmp2->context, p->context, sizeof(tmp2->context)-1);
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strncpy(tmp2->exten, p->exten, sizeof(tmp->exten)-1);
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tmp->priority = 1;
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tmp2->priority = 1;
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} else
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ast_log(LOG_WARNING, "Unable to allocate channel structure\n");
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return tmp;
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}
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static struct ast_channel *local_request(char *type, int format, void *data)
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{
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struct local_pvt *p;
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struct ast_channel *chan = NULL;
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p = local_alloc(data, format);
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if (p)
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chan = local_new(p, AST_STATE_DOWN);
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return chan;
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}
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static int locals_show(int fd, int argc, char **argv)
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{
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struct local_pvt *p;
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if (argc != 2)
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return RESULT_SHOWUSAGE;
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ast_mutex_lock(&locallock);
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p = locals;
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while(p) {
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ast_mutex_lock(&p->lock);
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ast_cli(fd, "%s -- %s@%s\n", p->owner ? p->owner->name : "<unowned>", p->exten, p->context);
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ast_mutex_unlock(&p->lock);
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p = p->next;
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}
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if (!locals)
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ast_cli(fd, "No local channels in use\n");
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ast_mutex_unlock(&locallock);
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return RESULT_SUCCESS;
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}
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static char show_locals_usage[] =
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"Usage: show locals\n"
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" Provides summary information on locals.\n";
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static struct ast_cli_entry cli_show_locals = {
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{ "show", "locals", NULL }, locals_show,
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"Show status of local channels", show_locals_usage, NULL };
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int load_module()
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{
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/* Make sure we can register our sip channel type */
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if (ast_channel_register(type, tdesc, capability, local_request)) {
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ast_log(LOG_ERROR, "Unable to register channel class %s\n", type);
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return -1;
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}
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ast_cli_register(&cli_show_locals);
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return 0;
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}
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int reload()
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{
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return 0;
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}
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int unload_module()
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{
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struct local_pvt *p;
|
|
/* First, take us out of the channel loop */
|
|
ast_cli_unregister(&cli_show_locals);
|
|
ast_channel_unregister(type);
|
|
if (!ast_mutex_lock(&locallock)) {
|
|
/* Hangup all interfaces if they have an owner */
|
|
p = locals;
|
|
while(p) {
|
|
if (p->owner)
|
|
ast_softhangup(p->owner, AST_SOFTHANGUP_APPUNLOAD);
|
|
p = p->next;
|
|
}
|
|
locals = NULL;
|
|
ast_mutex_unlock(&locallock);
|
|
} else {
|
|
ast_log(LOG_WARNING, "Unable to lock the monitor\n");
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int usecount()
|
|
{
|
|
int res;
|
|
ast_mutex_lock(&usecnt_lock);
|
|
res = usecnt;
|
|
ast_mutex_unlock(&usecnt_lock);
|
|
return res;
|
|
}
|
|
|
|
char *key()
|
|
{
|
|
return ASTERISK_GPL_KEY;
|
|
}
|
|
|
|
char *description()
|
|
{
|
|
return desc;
|
|
}
|
|
|