35a2f14d96
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@34463 65c4cc65-6c06-0410-ace0-fbb531ad65f3
666 lines
18 KiB
C
666 lines
18 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2005, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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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 Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \author Mark Spencer <markster@digium.com>
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*
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* \brief Local Proxy Channel
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*
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* \ingroup channel_drivers
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*/
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <errno.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 <netinet/in.h>
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#include <arpa/inet.h>
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#include <sys/signal.h>
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#include "asterisk/lock.h"
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#include "asterisk/channel.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 "asterisk/stringfields.h"
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#include "asterisk/devicestate.h"
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static const char tdesc[] = "Local Proxy Channel Driver";
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#define IS_OUTBOUND(a,b) (a == b->chan ? 1 : 0)
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static struct ast_channel *local_request(const char *type, int format, void *data, int *cause);
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static int local_digit(struct ast_channel *ast, char digit);
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static int local_call(struct ast_channel *ast, char *dest, int timeout);
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static int local_hangup(struct ast_channel *ast);
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static int local_answer(struct ast_channel *ast);
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static struct ast_frame *local_read(struct ast_channel *ast);
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static int local_write(struct ast_channel *ast, struct ast_frame *f);
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static int local_indicate(struct ast_channel *ast, int condition, const void *data, size_t datalen);
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static int local_fixup(struct ast_channel *oldchan, struct ast_channel *newchan);
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static int local_sendhtml(struct ast_channel *ast, int subclass, const char *data, int datalen);
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static int local_sendtext(struct ast_channel *ast, const char *text);
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static int local_devicestate(void *data);
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/* PBX interface structure for channel registration */
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static const struct ast_channel_tech local_tech = {
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.type = "Local",
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.description = tdesc,
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.capabilities = -1,
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.requester = local_request,
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.send_digit = local_digit,
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.call = local_call,
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.hangup = local_hangup,
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.answer = local_answer,
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.read = local_read,
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.write = local_write,
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.write_video = local_write,
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.exception = local_read,
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.indicate = local_indicate,
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.fixup = local_fixup,
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.send_html = local_sendhtml,
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.send_text = local_sendtext,
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.devicestate = local_devicestate,
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};
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struct local_pvt {
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ast_mutex_t lock; /* Channel private lock */
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char context[AST_MAX_CONTEXT]; /* 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; /* Don't leave masq state */
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struct ast_channel *owner; /* Master Channel */
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struct ast_channel *chan; /* Outbound channel */
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AST_LIST_ENTRY(local_pvt) list; /* Next entity */
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};
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static AST_LIST_HEAD_STATIC(locals, local_pvt);
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/*! \brief Adds devicestate to local channels */
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static int local_devicestate(void *data)
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{
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char *exten;
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char *context;
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int res;
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exten = ast_strdupa(data);
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context = strchr(exten, '@');
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if (!context) {
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ast_log(LOG_WARNING, "Someone used Local/%s somewhere without a @context. This is bad.\n", exten);
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return AST_DEVICE_INVALID;
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}
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*context = '\0';
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context = context + 1;
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if (option_debug > 2)
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ast_log(LOG_DEBUG, "Checking if extension %s@%s exists (devicestate)\n", exten, context);
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res = ast_exists_extension(NULL, context, exten, 1, NULL);
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if (!res) {
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return AST_DEVICE_INVALID;
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} else
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return AST_DEVICE_UNKNOWN;
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}
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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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ast_mutex_destroy(&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);
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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->tech_pvt;
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int isoutbound;
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int res = -1;
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ast_mutex_lock(&p->lock);
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isoutbound = IS_OUTBOUND(ast, p);
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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 (!p->chan || !p->owner)
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return;
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/* only do the masquerade if we are being called on the outbound channel,
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if it has been bridged to another channel and if there are no pending
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frames on the owner channel (because they would be transferred to the
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outbound channel during the masquerade)
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*/
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if (isoutbound && p->chan->_bridge /* Not ast_bridged_channel! Only go one step! */ && !p->owner->readq) {
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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 (!p->chan->_bridge->_softhangup) {
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if (!ast_mutex_trylock(&p->owner->lock)) {
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if (!p->owner->_softhangup) {
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ast_channel_masquerade(p->owner, p->chan->_bridge);
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p->alreadymasqed = 1;
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}
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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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}
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/* We only allow masquerading in one 'direction'... it's important to preserve the state
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(group variables, etc.) that live on p->chan->_bridge (and were put there by the dialplan)
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when the local channels go away.
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*/
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#if 0
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} else if (!isoutbound && p->owner && p->owner->_bridge && p->chan && !p->chan->readq) {
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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 (!p->owner->_bridge->_softhangup) {
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if (!ast_mutex_trylock(&p->chan->lock)) {
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if (!p->chan->_softhangup) {
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ast_channel_masquerade(p->chan, p->owner->_bridge);
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p->alreadymasqed = 1;
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}
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ast_mutex_unlock(&p->chan->lock);
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}
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}
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ast_mutex_unlock(&(p->owner->_bridge)->lock);
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}
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#endif
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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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return &ast_null_frame;
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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->tech_pvt;
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int res = -1;
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int isoutbound;
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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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isoutbound = IS_OUTBOUND(ast, p);
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if (f && (f->frametype == AST_FRAME_VOICE || f->frametype == AST_FRAME_VIDEO))
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check_bridge(p, isoutbound);
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if (!p->alreadymasqed)
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res = local_queue_frame(p, isoutbound, f, ast);
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else {
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if (option_debug)
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ast_log(LOG_DEBUG, "Not posting to queue since already masked on '%s'\n", ast->name);
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res = 0;
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}
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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->tech_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, const void *data, size_t datalen)
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{
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struct local_pvt *p = ast->tech_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;
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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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isoutbound = IS_OUTBOUND(ast, p);
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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->tech_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;
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ast_mutex_lock(&p->lock);
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isoutbound = IS_OUTBOUND(ast, p);
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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_sendtext(struct ast_channel *ast, const char *text)
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{
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struct local_pvt *p = ast->tech_pvt;
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int res = -1;
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struct ast_frame f = { AST_FRAME_TEXT, };
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int isoutbound;
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ast_mutex_lock(&p->lock);
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isoutbound = IS_OUTBOUND(ast, p);
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f.data = (char *) text;
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f.datalen = strlen(text) + 1;
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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_sendhtml(struct ast_channel *ast, int subclass, const char *data, int datalen)
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{
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struct local_pvt *p = ast->tech_pvt;
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int res = -1;
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struct ast_frame f = { AST_FRAME_HTML, };
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int isoutbound;
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ast_mutex_lock(&p->lock);
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isoutbound = IS_OUTBOUND(ast, p);
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f.subclass = subclass;
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f.data = (char *)data;
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f.datalen = datalen;
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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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/*! \brief Initiate new call, part of PBX interface
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* dest is the dial string */
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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->tech_pvt;
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int res;
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struct ast_var_t *varptr = NULL, *new;
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size_t len, namelen;
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ast_mutex_lock(&p->lock);
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p->chan->cid.cid_num = ast_strdup(p->owner->cid.cid_num);
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p->chan->cid.cid_name = ast_strdup(p->owner->cid.cid_name);
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p->chan->cid.cid_rdnis = ast_strdup(p->owner->cid.cid_rdnis);
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p->chan->cid.cid_ani = ast_strdup(p->owner->cid.cid_ani);
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p->chan->cid.cid_pres = p->owner->cid.cid_pres;
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ast_string_field_set(p->chan, language, p->owner->language);
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ast_string_field_set(p->chan, accountcode, p->owner->accountcode);
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p->chan->cdrflags = p->owner->cdrflags;
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/* copy the channel variables from the incoming channel to the outgoing channel */
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/* Note that due to certain assumptions, they MUST be in the same order */
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AST_LIST_TRAVERSE(&p->owner->varshead, varptr, entries) {
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namelen = strlen(varptr->name);
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len = sizeof(struct ast_var_t) + namelen + strlen(varptr->value) + 2;
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if ((new = ast_calloc(1, len))) {
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memcpy(new, varptr, len);
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new->value = &(new->name[0]) + namelen + 1;
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AST_LIST_INSERT_TAIL(&p->chan->varshead, new, entries);
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}
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}
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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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#if 0
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static void local_destroy(struct local_pvt *p)
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{
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struct local_pvt *cur;
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AST_LIST_LOCK(&locals);
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AST_LIST_TRAVERSE_SAFE_BEGIN(&locals, cur, list) {
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if (cur == p) {
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AST_LIST_REMOVE_CURRENT(&locals, list);
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ast_mutex_destroy(&cur->lock);
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free(cur);
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break;
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}
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}
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AST_LIST_TRAVERSE_SAFE_END
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AST_LIST_UNLOCK(&locals);
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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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#endif
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/*! \brief Hangup a call through the local proxy channel */
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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->tech_pvt;
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int isoutbound;
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struct ast_frame f = { AST_FRAME_CONTROL, AST_CONTROL_HANGUP };
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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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isoutbound = IS_OUTBOUND(ast, p);
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if (isoutbound) {
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const char *status = pbx_builtin_getvar_helper(p->chan, "DIALSTATUS");
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if ((status) && (p->owner))
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pbx_builtin_setvar_helper(p->owner, "CHANLOCALSTATUS", status);
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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->tech_pvt = NULL;
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ast_atomic_fetchadd_int(&__mod_desc->usecnt, -1);
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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_LIST_LOCK(&locals);
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AST_LIST_REMOVE(&locals, p, list);
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AST_LIST_UNLOCK(&locals);
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/* Grab / release lock just in case */
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ast_mutex_lock(&p->lock);
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ast_mutex_unlock(&p->lock);
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/* And destroy */
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if (!glaredetect) {
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ast_mutex_destroy(&p->lock);
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free(p);
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}
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return 0;
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}
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if (p->chan && !p->launchedpbx)
|
|
/* Need to actually hangup since there is no PBX */
|
|
ochan = p->chan;
|
|
else
|
|
local_queue_frame(p, isoutbound, &f, NULL);
|
|
ast_mutex_unlock(&p->lock);
|
|
if (ochan)
|
|
ast_hangup(ochan);
|
|
return 0;
|
|
}
|
|
|
|
/*! \brief Create a call structure */
|
|
static struct local_pvt *local_alloc(const char *data, int format)
|
|
{
|
|
struct local_pvt *tmp;
|
|
char *c;
|
|
char *opts;
|
|
|
|
if (!(tmp = ast_calloc(1, sizeof(*tmp))))
|
|
return NULL;
|
|
|
|
ast_mutex_init(&tmp->lock);
|
|
ast_copy_string(tmp->exten, data, sizeof(tmp->exten));
|
|
opts = strchr(tmp->exten, '/');
|
|
if (opts) {
|
|
*opts++ = '\0';
|
|
if (strchr(opts, 'n'))
|
|
tmp->nooptimization = 1;
|
|
}
|
|
c = strchr(tmp->exten, '@');
|
|
if (c)
|
|
*c++ = '\0';
|
|
ast_copy_string(tmp->context, c ? c : "default", sizeof(tmp->context));
|
|
tmp->reqformat = format;
|
|
if (!ast_exists_extension(NULL, tmp->context, tmp->exten, 1, NULL)) {
|
|
ast_log(LOG_NOTICE, "No such extension/context %s@%s creating local channel\n", tmp->exten, tmp->context);
|
|
ast_mutex_destroy(&tmp->lock);
|
|
free(tmp);
|
|
tmp = NULL;
|
|
} else {
|
|
/* Add to list */
|
|
AST_LIST_LOCK(&locals);
|
|
AST_LIST_INSERT_HEAD(&locals, tmp, list);
|
|
AST_LIST_UNLOCK(&locals);
|
|
}
|
|
|
|
return tmp;
|
|
}
|
|
|
|
/*! \brief Start new local channel */
|
|
static struct ast_channel *local_new(struct local_pvt *p, int state)
|
|
{
|
|
struct ast_channel *tmp, *tmp2;
|
|
int randnum = ast_random() & 0xffff;
|
|
|
|
tmp = ast_channel_alloc(1);
|
|
tmp2 = ast_channel_alloc(1);
|
|
if (!tmp || !tmp2) {
|
|
if (tmp)
|
|
ast_channel_free(tmp);
|
|
if (tmp2)
|
|
ast_channel_free(tmp2);
|
|
ast_log(LOG_WARNING, "Unable to allocate channel structure(s)\n");
|
|
return NULL;
|
|
}
|
|
|
|
tmp2->tech = tmp->tech = &local_tech;
|
|
tmp->nativeformats = p->reqformat;
|
|
tmp2->nativeformats = p->reqformat;
|
|
ast_string_field_build(tmp, name, "Local/%s@%s-%04x,1", p->exten, p->context, randnum);
|
|
ast_string_field_build(tmp2, name, "Local/%s@%s-%04x,2", p->exten, p->context, randnum);
|
|
ast_setstate(tmp, state);
|
|
ast_setstate(tmp2, AST_STATE_RING);
|
|
tmp->writeformat = p->reqformat;
|
|
tmp2->writeformat = p->reqformat;
|
|
tmp->rawwriteformat = p->reqformat;
|
|
tmp2->rawwriteformat = p->reqformat;
|
|
tmp->readformat = p->reqformat;
|
|
tmp2->readformat = p->reqformat;
|
|
tmp->rawreadformat = p->reqformat;
|
|
tmp2->rawreadformat = p->reqformat;
|
|
tmp->tech_pvt = p;
|
|
tmp2->tech_pvt = p;
|
|
p->owner = tmp;
|
|
p->chan = tmp2;
|
|
ast_atomic_fetchadd_int(&__mod_desc->usecnt, +2); /* we allocate 2 new channels */
|
|
ast_update_use_count();
|
|
ast_copy_string(tmp->context, p->context, sizeof(tmp->context));
|
|
ast_copy_string(tmp2->context, p->context, sizeof(tmp2->context));
|
|
ast_copy_string(tmp2->exten, p->exten, sizeof(tmp->exten));
|
|
tmp->priority = 1;
|
|
tmp2->priority = 1;
|
|
|
|
return tmp;
|
|
}
|
|
|
|
|
|
/*! \brief Part of PBX interface */
|
|
static struct ast_channel *local_request(const char *type, int format, void *data, int *cause)
|
|
{
|
|
struct local_pvt *p;
|
|
struct ast_channel *chan = NULL;
|
|
|
|
p = local_alloc(data, format);
|
|
if (p)
|
|
chan = local_new(p, AST_STATE_DOWN);
|
|
return chan;
|
|
}
|
|
|
|
/*! \brief CLI command "local show channels" */
|
|
static int locals_show(int fd, int argc, char **argv)
|
|
{
|
|
struct local_pvt *p;
|
|
|
|
if (argc != 3)
|
|
return RESULT_SHOWUSAGE;
|
|
if (AST_LIST_EMPTY(&locals))
|
|
ast_cli(fd, "No local channels in use\n");
|
|
AST_LIST_LOCK(&locals);
|
|
AST_LIST_TRAVERSE(&locals, p, list) {
|
|
ast_mutex_lock(&p->lock);
|
|
ast_cli(fd, "%s -- %s@%s\n", p->owner ? p->owner->name : "<unowned>", p->exten, p->context);
|
|
ast_mutex_unlock(&p->lock);
|
|
}
|
|
AST_LIST_UNLOCK(&locals);
|
|
return RESULT_SUCCESS;
|
|
}
|
|
|
|
static char show_locals_usage[] =
|
|
"Usage: local show channels\n"
|
|
" Provides summary information on active local proxy channels.\n";
|
|
|
|
static struct ast_cli_entry cli_show_locals = {
|
|
{ "local", "show", "channels", NULL }, locals_show,
|
|
"Show status of local channels", show_locals_usage, NULL };
|
|
|
|
/*! \brief Load module into PBX, register channel */
|
|
static int load_module(void *mod)
|
|
{
|
|
__mod_desc = mod;
|
|
|
|
/* Make sure we can register our channel type */
|
|
if (ast_channel_register(&local_tech)) {
|
|
ast_log(LOG_ERROR, "Unable to register channel class 'Local'\n");
|
|
return -1;
|
|
}
|
|
ast_cli_register(&cli_show_locals);
|
|
return 0;
|
|
}
|
|
|
|
/*! \brief Unload the local proxy channel from Asterisk */
|
|
static int unload_module(void *mod)
|
|
{
|
|
struct local_pvt *p;
|
|
|
|
/* First, take us out of the channel loop */
|
|
ast_cli_unregister(&cli_show_locals);
|
|
ast_channel_unregister(&local_tech);
|
|
if (!AST_LIST_LOCK(&locals)) {
|
|
/* Hangup all interfaces if they have an owner */
|
|
AST_LIST_TRAVERSE(&locals, p, list) {
|
|
if (p->owner)
|
|
ast_softhangup(p->owner, AST_SOFTHANGUP_APPUNLOAD);
|
|
}
|
|
AST_LIST_UNLOCK(&locals);
|
|
AST_LIST_HEAD_DESTROY(&locals);
|
|
} else {
|
|
ast_log(LOG_WARNING, "Unable to lock the monitor\n");
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const char *key(void)
|
|
{
|
|
return ASTERISK_GPL_KEY;
|
|
}
|
|
|
|
static const char *description(void)
|
|
{
|
|
return "Local Proxy Channel";
|
|
}
|
|
|
|
STD_MOD(MOD_1, NULL, NULL, NULL);
|