There is a lot that could be said about this, but the patch is a big improvement for performance, stability, code maintainability, and ease of future code development. The channel list is no longer an unsorted linked list. The main container for channels is an astobj2 hash table. All of the code related to searching for channels or iterating active channels has been rewritten. Let n be the number of active channels. Iterating the channel list has gone from O(n^2) to O(n). Searching for a channel by name went from O(n) to O(1). Searching for a channel by extension is still O(n), but uses a new method for doing so, which is more efficient. The ast_channel object is now a reference counted object. The benefits here are plentiful. Some benefits directly related to issues in the previous code include: 1) When threads other than the channel thread owning a channel wanted access to a channel, it had to hold the lock on it to ensure that it didn't go away. This is no longer a requirement. Holding a reference is sufficient. 2) There are places that now require less dealing with channel locks. 3) There are places where channel locks are held for much shorter periods of time. 4) There are places where dealing with more than one channel at a time becomes _MUCH_ easier. ChanSpy is a great example of this. Writing code in the future that deals with multiple channels will be much easier. Some additional information regarding channel locking and reference count handling can be found in channel.h, where a new section has been added that discusses some of the rules associated with it. Mark Michelson also assisted with the development of this patch. He did the conversion of ChanSpy and introduced a new API, ast_autochan, which makes it much easier to deal with holding on to a channel pointer for an extended period of time and having it get automatically updated if the channel gets masqueraded. Mark was also a huge help in the code review process. Thanks to David Vossel for his assistance with this branch, as well. David did the conversion of the DAHDIScan application by making it become a wrapper for ChanSpy internally. The changes come from the svn/asterisk/team/russell/ast_channel_ao2 branch. Review: http://reviewboard.digium.com/r/203/ git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@190423 65c4cc65-6c06-0410-ace0-fbb531ad65f3
929 lines
27 KiB
C
929 lines
27 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 <fcntl.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/module.h"
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#include "asterisk/pbx.h"
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#include "asterisk/sched.h"
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#include "asterisk/io.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_jb_conf g_jb_conf = {
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.flags = 0,
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.max_size = -1,
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.resync_threshold = -1,
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.impl = "",
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};
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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_begin(struct ast_channel *ast, char digit);
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static int local_digit_end(struct ast_channel *ast, char digit, unsigned int duration);
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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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static struct ast_channel *local_bridgedchannel(struct ast_channel *chan, struct ast_channel *bridge);
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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_begin = local_digit_begin,
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.send_digit_end = local_digit_end,
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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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.bridged_channel = local_bridgedchannel,
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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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unsigned int flags; /* Private flags */
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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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struct ast_jb_conf jb_conf; /*!< jitterbuffer configuration for this local channel */
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struct ast_channel *owner; /* Master Channel - Bridging happens here */
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struct ast_channel *chan; /* Outbound channel - PBX is run here */
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struct ast_module_user *u_owner; /*! reference to keep the module loaded while in use */
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struct ast_module_user *u_chan; /*! reference to keep the module loaded while in use */
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AST_LIST_ENTRY(local_pvt) list; /* Next entity */
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};
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#define LOCAL_GLARE_DETECT (1 << 0) /*!< Detect glare on hangup */
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#define LOCAL_CANCEL_QUEUE (1 << 1) /*!< Cancel queue */
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#define LOCAL_ALREADY_MASQED (1 << 2) /*!< Already masqueraded */
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#define LOCAL_LAUNCHED_PBX (1 << 3) /*!< PBX was launched */
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#define LOCAL_NO_OPTIMIZATION (1 << 4) /*!< Do not optimize using masquerading */
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#define LOCAL_BRIDGE (1 << 5) /*!< Report back the "true" channel as being bridged to */
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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 = ast_strdupa(data);
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char *context = NULL, *opts = NULL;
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int res;
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struct local_pvt *lp;
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if (!(context = strchr(exten, '@'))) {
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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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/* Strip options if they exist */
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if ((opts = strchr(context, '/')))
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*opts = '\0';
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ast_debug(3, "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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res = AST_DEVICE_NOT_INUSE;
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AST_LIST_LOCK(&locals);
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AST_LIST_TRAVERSE(&locals, lp, list) {
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if (!strcmp(exten, lp->exten) && !strcmp(context, lp->context) && lp->owner) {
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res = AST_DEVICE_INUSE;
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break;
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}
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}
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AST_LIST_UNLOCK(&locals);
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return res;
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}
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/*!
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* \note Assumes the pvt is no longer in the pvts list
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*/
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static struct local_pvt *local_pvt_destroy(struct local_pvt *pvt)
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{
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ast_mutex_destroy(&pvt->lock);
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ast_free(pvt);
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return NULL;
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}
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/*! \brief Return the bridged channel of a Local channel */
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static struct ast_channel *local_bridgedchannel(struct ast_channel *chan, struct ast_channel *bridge)
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{
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struct local_pvt *p = bridge->tech_pvt;
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struct ast_channel *bridged = bridge;
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ast_mutex_lock(&p->lock);
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if (ast_test_flag(p, LOCAL_BRIDGE)) {
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/* Find the opposite channel */
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bridged = (bridge == p->owner ? p->chan : p->owner);
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/* Now see if the opposite channel is bridged to anything */
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if (!bridged) {
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bridged = bridge;
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} else if (bridged->_bridge) {
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bridged = bridged->_bridge;
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}
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}
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ast_mutex_unlock(&p->lock);
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return bridged;
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}
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static int local_queue_frame(struct local_pvt *p, int isoutbound, struct ast_frame *f,
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struct ast_channel *us, int us_locked)
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{
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struct ast_channel *other = NULL;
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/* Recalculate outbound channel */
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other = isoutbound ? p->owner : p->chan;
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if (!other) {
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return 0;
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}
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/* do not queue frame if generator is on both local channels */
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if (us && us->generator && other->generator) {
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return 0;
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}
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/* Set glare detection */
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ast_set_flag(p, LOCAL_GLARE_DETECT);
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/* Ensure that we have both channels locked */
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while (other && ast_channel_trylock(other)) {
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ast_mutex_unlock(&p->lock);
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if (us && us_locked) {
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do {
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CHANNEL_DEADLOCK_AVOIDANCE(us);
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} while (ast_mutex_trylock(&p->lock));
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} else {
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usleep(1);
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ast_mutex_lock(&p->lock);
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}
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other = isoutbound ? p->owner : p->chan;
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}
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/* Since glare detection only occurs within this function, and because
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* a pvt flag cannot be set without having the pvt lock, this is the only
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* location where we could detect a cancelling of the queue. */
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if (ast_test_flag(p, LOCAL_CANCEL_QUEUE)) {
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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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p = local_pvt_destroy(p);
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return -1;
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}
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if (other) {
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ast_queue_frame(other, f);
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ast_channel_unlock(other);
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}
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ast_clear_flag(p, LOCAL_GLARE_DETECT);
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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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if (!p)
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return -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, 1);
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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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if (!res)
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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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struct ast_channel_monitor *tmp;
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if (ast_test_flag(p, LOCAL_ALREADY_MASQED) || ast_test_flag(p, LOCAL_NO_OPTIMIZATION) || !p->chan || !p->owner || (p->chan->_bridge != ast_bridged_channel(p->chan)))
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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! */ && AST_LIST_EMPTY(&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_channel_trylock(p->chan->_bridge)) {
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if (!ast_check_hangup(p->chan->_bridge)) {
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if (!ast_channel_trylock(p->owner)) {
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if (!ast_check_hangup(p->owner)) {
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if (p->owner->monitor && !p->chan->_bridge->monitor) {
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/* If a local channel is being monitored, we don't want a masquerade
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* to cause the monitor to go away. Since the masquerade swaps the monitors,
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* pre-swapping the monitors before the masquerade will ensure that the monitor
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* ends up where it is expected.
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*/
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tmp = p->owner->monitor;
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p->owner->monitor = p->chan->_bridge->monitor;
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p->chan->_bridge->monitor = tmp;
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}
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if (p->chan->audiohooks) {
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struct ast_audiohook_list *audiohooks_swapper;
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audiohooks_swapper = p->chan->audiohooks;
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p->chan->audiohooks = p->owner->audiohooks;
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p->owner->audiohooks = audiohooks_swapper;
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}
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ast_app_group_update(p->chan, p->owner);
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ast_channel_masquerade(p->owner, p->chan->_bridge);
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ast_set_flag(p, LOCAL_ALREADY_MASQED);
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}
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ast_channel_unlock(p->owner);
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}
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ast_channel_unlock(p->chan->_bridge);
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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 && AST_LIST_EMPTY(&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 (!ast_check_hangup(p->owner->_bridge)) {
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if (!ast_mutex_trylock(&p->chan->lock)) {
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if (!ast_check_hangup(p->chan)) {
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ast_channel_masquerade(p->chan, p->owner->_bridge);
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ast_set_flag(p, LOCAL_ALREADY_MASQED);
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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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if (!p)
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return -1;
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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 (!ast_test_flag(p, LOCAL_ALREADY_MASQED))
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res = local_queue_frame(p, isoutbound, f, ast, 1);
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else {
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ast_debug(1, "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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if (!res)
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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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if (!p)
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return -1;
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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 = 0;
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struct ast_frame f = { AST_FRAME_CONTROL, };
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int isoutbound;
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if (!p)
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return -1;
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/* If this is an MOH hold or unhold, do it on the Local channel versus real channel */
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if (condition == AST_CONTROL_HOLD) {
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ast_moh_start(ast, data, NULL);
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} else if (condition == AST_CONTROL_UNHOLD) {
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ast_moh_stop(ast);
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} else if (condition == AST_CONTROL_CONNECTED_LINE || condition == AST_CONTROL_REDIRECTING) {
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struct ast_channel *this_channel;
|
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struct ast_channel *the_other_channel;
|
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/* A connected line update frame may only contain a partial amount of data, such
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* as just a source, or just a ton, and not the full amount of information. However,
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* the collected information is all stored in the outgoing channel's connectedline
|
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* structure, so when receiving a connected line update on an outgoing local channel,
|
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* we need to transmit the collected connected line information instead of whatever
|
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* happens to be in this control frame. The same applies for redirecting information, which
|
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* is why it is handled here as well.*/
|
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isoutbound = IS_OUTBOUND(ast, p);
|
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if (isoutbound) {
|
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this_channel = p->chan;
|
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the_other_channel = p->owner;
|
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} else {
|
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this_channel = p->owner;
|
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the_other_channel = p->chan;
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}
|
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if (the_other_channel) {
|
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unsigned char frame_data[1024];
|
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if (condition == AST_CONTROL_CONNECTED_LINE) {
|
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f.datalen = ast_connected_line_build_data(frame_data, sizeof(frame_data), &this_channel->connected);
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} else {
|
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f.datalen = ast_redirecting_build_data(frame_data, sizeof(frame_data), &this_channel->redirecting);
|
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}
|
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f.subclass = condition;
|
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f.data.ptr = frame_data;
|
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ast_mutex_lock(&p->lock);
|
|
if (!(res = local_queue_frame(p, isoutbound, &f, ast, 1))) {
|
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ast_mutex_unlock(&p->lock);
|
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}
|
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}
|
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} else {
|
|
/* Queue up a frame representing the indication as a control frame */
|
|
ast_mutex_lock(&p->lock);
|
|
isoutbound = IS_OUTBOUND(ast, p);
|
|
f.subclass = condition;
|
|
f.data.ptr = (void*)data;
|
|
f.datalen = datalen;
|
|
if (!(res = local_queue_frame(p, isoutbound, &f, ast, 1)))
|
|
ast_mutex_unlock(&p->lock);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static int local_digit_begin(struct ast_channel *ast, char digit)
|
|
{
|
|
struct local_pvt *p = ast->tech_pvt;
|
|
int res = -1;
|
|
struct ast_frame f = { AST_FRAME_DTMF_BEGIN, };
|
|
int isoutbound;
|
|
|
|
if (!p)
|
|
return -1;
|
|
|
|
ast_mutex_lock(&p->lock);
|
|
isoutbound = IS_OUTBOUND(ast, p);
|
|
f.subclass = digit;
|
|
if (!(res = local_queue_frame(p, isoutbound, &f, ast, 0)))
|
|
ast_mutex_unlock(&p->lock);
|
|
|
|
return res;
|
|
}
|
|
|
|
static int local_digit_end(struct ast_channel *ast, char digit, unsigned int duration)
|
|
{
|
|
struct local_pvt *p = ast->tech_pvt;
|
|
int res = -1;
|
|
struct ast_frame f = { AST_FRAME_DTMF_END, };
|
|
int isoutbound;
|
|
|
|
if (!p)
|
|
return -1;
|
|
|
|
ast_mutex_lock(&p->lock);
|
|
isoutbound = IS_OUTBOUND(ast, p);
|
|
f.subclass = digit;
|
|
f.len = duration;
|
|
if (!(res = local_queue_frame(p, isoutbound, &f, ast, 0)))
|
|
ast_mutex_unlock(&p->lock);
|
|
|
|
return res;
|
|
}
|
|
|
|
static int local_sendtext(struct ast_channel *ast, const char *text)
|
|
{
|
|
struct local_pvt *p = ast->tech_pvt;
|
|
int res = -1;
|
|
struct ast_frame f = { AST_FRAME_TEXT, };
|
|
int isoutbound;
|
|
|
|
if (!p)
|
|
return -1;
|
|
|
|
ast_mutex_lock(&p->lock);
|
|
isoutbound = IS_OUTBOUND(ast, p);
|
|
f.data.ptr = (char *) text;
|
|
f.datalen = strlen(text) + 1;
|
|
if (!(res = local_queue_frame(p, isoutbound, &f, ast, 0)))
|
|
ast_mutex_unlock(&p->lock);
|
|
return res;
|
|
}
|
|
|
|
static int local_sendhtml(struct ast_channel *ast, int subclass, const char *data, int datalen)
|
|
{
|
|
struct local_pvt *p = ast->tech_pvt;
|
|
int res = -1;
|
|
struct ast_frame f = { AST_FRAME_HTML, };
|
|
int isoutbound;
|
|
|
|
if (!p)
|
|
return -1;
|
|
|
|
ast_mutex_lock(&p->lock);
|
|
isoutbound = IS_OUTBOUND(ast, p);
|
|
f.subclass = subclass;
|
|
f.data.ptr = (char *)data;
|
|
f.datalen = datalen;
|
|
if (!(res = local_queue_frame(p, isoutbound, &f, ast, 0)))
|
|
ast_mutex_unlock(&p->lock);
|
|
return res;
|
|
}
|
|
|
|
/*! \brief Initiate new call, part of PBX interface
|
|
* dest is the dial string */
|
|
static int local_call(struct ast_channel *ast, char *dest, int timeout)
|
|
{
|
|
struct local_pvt *p = ast->tech_pvt;
|
|
int res;
|
|
struct ast_var_t *varptr = NULL, *new;
|
|
size_t len, namelen;
|
|
|
|
if (!p)
|
|
return -1;
|
|
|
|
/* If you value your sanity, please don't look at this code */
|
|
start_over:
|
|
while (ast_channel_trylock(p->chan)) {
|
|
ast_channel_unlock(p->owner);
|
|
usleep(1);
|
|
ast_channel_lock(p->owner);
|
|
}
|
|
|
|
/* p->owner and p->chan are locked now. Let's get p locked */
|
|
if (ast_mutex_trylock(&p->lock)) {
|
|
/* @#$&$@ */
|
|
ast_channel_unlock(p->chan);
|
|
ast_channel_unlock(p->owner);
|
|
usleep(1);
|
|
ast_channel_lock(p->owner);
|
|
goto start_over;
|
|
}
|
|
|
|
/*
|
|
* Note that cid_num and cid_name aren't passed in the ast_channel_alloc
|
|
* call, so it's done here instead.
|
|
*
|
|
* All these failure points just return -1. The individual strings will
|
|
* be cleared when we destroy the channel.
|
|
*/
|
|
if (p->owner->cid.cid_rdnis) {
|
|
if (!(p->chan->cid.cid_rdnis = ast_strdup(p->owner->cid.cid_rdnis))) {
|
|
return -1;
|
|
}
|
|
}
|
|
ast_party_redirecting_copy(&p->chan->redirecting, &p->owner->redirecting);
|
|
|
|
if (p->owner->cid.cid_dnid) {
|
|
if (!(p->chan->cid.cid_dnid = ast_strdup(p->owner->cid.cid_dnid))) {
|
|
return -1;
|
|
}
|
|
}
|
|
p->chan->cid.cid_tns = p->owner->cid.cid_tns;
|
|
|
|
ast_connected_line_copy_to_caller(&p->chan->cid, &p->owner->connected);
|
|
ast_connected_line_copy_from_caller(&p->chan->connected, &p->owner->cid);
|
|
|
|
ast_string_field_set(p->chan, language, p->owner->language);
|
|
ast_string_field_set(p->chan, accountcode, p->owner->accountcode);
|
|
ast_string_field_set(p->chan, musicclass, p->owner->musicclass);
|
|
ast_cdr_update(p->chan);
|
|
p->chan->cdrflags = p->owner->cdrflags;
|
|
|
|
if (!ast_exists_extension(NULL, p->chan->context, p->chan->exten, 1, p->owner->cid.cid_num)) {
|
|
ast_log(LOG_NOTICE, "No such extension/context %s@%s while calling Local channel\n", p->chan->exten, p->chan->context);
|
|
ast_mutex_unlock(&p->lock);
|
|
return -1;
|
|
}
|
|
|
|
/* Make sure we inherit the ANSWERED_ELSEWHERE flag if it's set on the queue/dial call request in the dialplan */
|
|
if (ast_test_flag(ast, AST_FLAG_ANSWERED_ELSEWHERE)) {
|
|
ast_set_flag(p->chan, AST_FLAG_ANSWERED_ELSEWHERE);
|
|
}
|
|
|
|
/* copy the channel variables from the incoming channel to the outgoing channel */
|
|
/* Note that due to certain assumptions, they MUST be in the same order */
|
|
AST_LIST_TRAVERSE(&p->owner->varshead, varptr, entries) {
|
|
namelen = strlen(varptr->name);
|
|
len = sizeof(struct ast_var_t) + namelen + strlen(varptr->value) + 2;
|
|
if ((new = ast_calloc(1, len))) {
|
|
memcpy(new, varptr, len);
|
|
new->value = &(new->name[0]) + namelen + 1;
|
|
AST_LIST_INSERT_TAIL(&p->chan->varshead, new, entries);
|
|
}
|
|
}
|
|
ast_channel_datastore_inherit(p->owner, p->chan);
|
|
|
|
/* Start switch on sub channel */
|
|
if (!(res = ast_pbx_start(p->chan)))
|
|
ast_set_flag(p, LOCAL_LAUNCHED_PBX);
|
|
|
|
ast_mutex_unlock(&p->lock);
|
|
ast_channel_unlock(p->chan);
|
|
return res;
|
|
}
|
|
|
|
/*! \brief Hangup a call through the local proxy channel */
|
|
static int local_hangup(struct ast_channel *ast)
|
|
{
|
|
struct local_pvt *p = ast->tech_pvt;
|
|
int isoutbound;
|
|
struct ast_frame f = { AST_FRAME_CONTROL, AST_CONTROL_HANGUP, .data.uint32 = ast->hangupcause };
|
|
struct ast_channel *ochan = NULL;
|
|
int glaredetect = 0, res = 0;
|
|
|
|
if (!p)
|
|
return -1;
|
|
|
|
ast_mutex_lock(&p->lock);
|
|
|
|
isoutbound = IS_OUTBOUND(ast, p);
|
|
|
|
if (p->chan && ast_test_flag(ast, AST_FLAG_ANSWERED_ELSEWHERE)) {
|
|
ast_set_flag(p->chan, AST_FLAG_ANSWERED_ELSEWHERE);
|
|
ast_debug(2, "This local call has the ANSWERED_ELSEWHERE flag set.\n");
|
|
}
|
|
|
|
if (isoutbound) {
|
|
const char *status = pbx_builtin_getvar_helper(p->chan, "DIALSTATUS");
|
|
if ((status) && (p->owner)) {
|
|
/* Deadlock avoidance */
|
|
while (p->owner && ast_channel_trylock(p->owner)) {
|
|
ast_mutex_unlock(&p->lock);
|
|
if (ast) {
|
|
ast_channel_unlock(ast);
|
|
}
|
|
usleep(1);
|
|
if (ast) {
|
|
ast_channel_lock(ast);
|
|
}
|
|
ast_mutex_lock(&p->lock);
|
|
}
|
|
if (p->owner) {
|
|
pbx_builtin_setvar_helper(p->owner, "CHANLOCALSTATUS", status);
|
|
ast_channel_unlock(p->owner);
|
|
}
|
|
}
|
|
p->chan = NULL;
|
|
ast_clear_flag(p, LOCAL_LAUNCHED_PBX);
|
|
ast_module_user_remove(p->u_chan);
|
|
} else {
|
|
p->owner = NULL;
|
|
ast_module_user_remove(p->u_owner);
|
|
while (p->chan && ast_channel_trylock(p->chan)) {
|
|
DEADLOCK_AVOIDANCE(&p->lock);
|
|
}
|
|
if (p->chan) {
|
|
ast_queue_hangup(p->chan);
|
|
ast_channel_unlock(p->chan);
|
|
}
|
|
}
|
|
|
|
ast->tech_pvt = NULL;
|
|
|
|
if (!p->owner && !p->chan) {
|
|
/* Okay, done with the private part now, too. */
|
|
glaredetect = ast_test_flag(p, LOCAL_GLARE_DETECT);
|
|
/* If we have a queue holding, don't actually destroy p yet, but
|
|
let local_queue do it. */
|
|
if (glaredetect)
|
|
ast_set_flag(p, LOCAL_CANCEL_QUEUE);
|
|
/* Remove from list */
|
|
AST_LIST_LOCK(&locals);
|
|
AST_LIST_REMOVE(&locals, p, list);
|
|
AST_LIST_UNLOCK(&locals);
|
|
ast_mutex_unlock(&p->lock);
|
|
/* And destroy */
|
|
if (!glaredetect) {
|
|
p = local_pvt_destroy(p);
|
|
}
|
|
return 0;
|
|
}
|
|
if (p->chan && !ast_test_flag(p, LOCAL_LAUNCHED_PBX))
|
|
/* Need to actually hangup since there is no PBX */
|
|
ochan = p->chan;
|
|
else
|
|
res = local_queue_frame(p, isoutbound, &f, NULL, 1);
|
|
if (!res)
|
|
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 = NULL;
|
|
char *c = NULL, *opts = NULL;
|
|
|
|
if (!(tmp = ast_calloc(1, sizeof(*tmp))))
|
|
return NULL;
|
|
|
|
/* Initialize private structure information */
|
|
ast_mutex_init(&tmp->lock);
|
|
ast_copy_string(tmp->exten, data, sizeof(tmp->exten));
|
|
|
|
memcpy(&tmp->jb_conf, &g_jb_conf, sizeof(tmp->jb_conf));
|
|
|
|
/* Look for options */
|
|
if ((opts = strchr(tmp->exten, '/'))) {
|
|
*opts++ = '\0';
|
|
if (strchr(opts, 'n'))
|
|
ast_set_flag(tmp, LOCAL_NO_OPTIMIZATION);
|
|
if (strchr(opts, 'j')) {
|
|
if (ast_test_flag(tmp, LOCAL_NO_OPTIMIZATION))
|
|
ast_set_flag(&tmp->jb_conf, AST_JB_ENABLED);
|
|
else {
|
|
ast_log(LOG_ERROR, "You must use the 'n' option for chan_local "
|
|
"to use the 'j' option to enable the jitterbuffer\n");
|
|
}
|
|
}
|
|
if (strchr(opts, 'b')) {
|
|
ast_set_flag(tmp, LOCAL_BRIDGE);
|
|
}
|
|
}
|
|
|
|
/* Look for a context */
|
|
if ((c = strchr(tmp->exten, '@')))
|
|
*c++ = '\0';
|
|
|
|
ast_copy_string(tmp->context, c ? c : "default", sizeof(tmp->context));
|
|
|
|
tmp->reqformat = format;
|
|
|
|
#if 0
|
|
/* We can't do this check here, because we don't know the CallerID yet, and
|
|
* the CallerID could potentially affect what step is actually taken (or
|
|
* even if that step exists). */
|
|
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);
|
|
tmp = local_pvt_destroy(tmp);
|
|
} else {
|
|
#endif
|
|
/* Add to list */
|
|
AST_LIST_LOCK(&locals);
|
|
AST_LIST_INSERT_HEAD(&locals, tmp, list);
|
|
AST_LIST_UNLOCK(&locals);
|
|
#if 0
|
|
}
|
|
#endif
|
|
|
|
return tmp;
|
|
}
|
|
|
|
/*! \brief Start new local channel */
|
|
static struct ast_channel *local_new(struct local_pvt *p, int state)
|
|
{
|
|
struct ast_channel *tmp = NULL, *tmp2 = NULL;
|
|
int randnum = ast_random() & 0xffff, fmt = 0;
|
|
const char *t;
|
|
int ama;
|
|
|
|
/* Allocate two new Asterisk channels */
|
|
/* safe accountcode */
|
|
if (p->owner && p->owner->accountcode)
|
|
t = p->owner->accountcode;
|
|
else
|
|
t = "";
|
|
|
|
if (p->owner)
|
|
ama = p->owner->amaflags;
|
|
else
|
|
ama = 0;
|
|
if (!(tmp = ast_channel_alloc(1, state, 0, 0, t, p->exten, p->context, ama, "Local/%s@%s-%04x;1", p->exten, p->context, randnum))
|
|
|| !(tmp2 = ast_channel_alloc(1, AST_STATE_RING, 0, 0, t, p->exten, p->context, ama, "Local/%s@%s-%04x;2", p->exten, p->context, randnum))) {
|
|
if (tmp) {
|
|
tmp = ast_channel_release(tmp);
|
|
}
|
|
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;
|
|
|
|
/* Determine our read/write format and set it on each channel */
|
|
fmt = ast_best_codec(p->reqformat);
|
|
tmp->writeformat = fmt;
|
|
tmp2->writeformat = fmt;
|
|
tmp->rawwriteformat = fmt;
|
|
tmp2->rawwriteformat = fmt;
|
|
tmp->readformat = fmt;
|
|
tmp2->readformat = fmt;
|
|
tmp->rawreadformat = fmt;
|
|
tmp2->rawreadformat = fmt;
|
|
|
|
tmp->tech_pvt = p;
|
|
tmp2->tech_pvt = p;
|
|
|
|
p->owner = tmp;
|
|
p->chan = tmp2;
|
|
p->u_owner = ast_module_user_add(p->owner);
|
|
p->u_chan = ast_module_user_add(p->chan);
|
|
|
|
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;
|
|
|
|
ast_jb_configure(tmp, &p->jb_conf);
|
|
|
|
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 = NULL;
|
|
struct ast_channel *chan = NULL;
|
|
|
|
/* Allocate a new private structure and then Asterisk channel */
|
|
if ((p = local_alloc(data, format))) {
|
|
if (!(chan = local_new(p, AST_STATE_DOWN))) {
|
|
AST_LIST_LOCK(&locals);
|
|
AST_LIST_REMOVE(&locals, p, list);
|
|
AST_LIST_UNLOCK(&locals);
|
|
p = local_pvt_destroy(p);
|
|
}
|
|
}
|
|
|
|
return chan;
|
|
}
|
|
|
|
/*! \brief CLI command "local show channels" */
|
|
static char *locals_show(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
|
|
{
|
|
struct local_pvt *p = NULL;
|
|
|
|
switch (cmd) {
|
|
case CLI_INIT:
|
|
e->command = "local show channels";
|
|
e->usage =
|
|
"Usage: local show channels\n"
|
|
" Provides summary information on active local proxy channels.\n";
|
|
return NULL;
|
|
case CLI_GENERATE:
|
|
return NULL;
|
|
}
|
|
|
|
if (a->argc != 3)
|
|
return CLI_SHOWUSAGE;
|
|
|
|
AST_LIST_LOCK(&locals);
|
|
if (!AST_LIST_EMPTY(&locals)) {
|
|
AST_LIST_TRAVERSE(&locals, p, list) {
|
|
ast_mutex_lock(&p->lock);
|
|
ast_cli(a->fd, "%s -- %s@%s\n", p->owner ? p->owner->name : "<unowned>", p->exten, p->context);
|
|
ast_mutex_unlock(&p->lock);
|
|
}
|
|
} else
|
|
ast_cli(a->fd, "No local channels in use\n");
|
|
AST_LIST_UNLOCK(&locals);
|
|
|
|
return CLI_SUCCESS;
|
|
}
|
|
|
|
static struct ast_cli_entry cli_local[] = {
|
|
AST_CLI_DEFINE(locals_show, "List status of local channels"),
|
|
};
|
|
|
|
/*! \brief Load module into PBX, register channel */
|
|
static int load_module(void)
|
|
{
|
|
/* 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 AST_MODULE_LOAD_FAILURE;
|
|
}
|
|
ast_cli_register_multiple(cli_local, sizeof(cli_local) / sizeof(struct ast_cli_entry));
|
|
return AST_MODULE_LOAD_SUCCESS;
|
|
}
|
|
|
|
/*! \brief Unload the local proxy channel from Asterisk */
|
|
static int unload_module(void)
|
|
{
|
|
struct local_pvt *p = NULL;
|
|
|
|
/* First, take us out of the channel loop */
|
|
ast_cli_unregister_multiple(cli_local, sizeof(cli_local) / sizeof(struct ast_cli_entry));
|
|
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);
|
|
} else {
|
|
ast_log(LOG_WARNING, "Unable to lock the monitor\n");
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Local Proxy Channel (Note: used internally by other modules)");
|