1 files changed, 761 insertions, 0 deletions

diff --git a/trunk/channels/chan_local.c b/trunk/channels/chan_local.c
new file mode 100644
index 000000000..e42368e32
--- /dev/null
+++ b/trunk/channels/chan_local.c
@@ -0,0 +1,761 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 1999 - 2005, Digium, Inc.
+ *
+ * Mark Spencer <markster@digium.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*! \file
+ *
+ * \author Mark Spencer <markster@digium.com>
+ *
+ * \brief Local Proxy Channel
+ * 
+ * \ingroup channel_drivers
+ */
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include <fcntl.h>
+#include <sys/signal.h>
+
+#include "asterisk/lock.h"
+#include "asterisk/channel.h"
+#include "asterisk/config.h"
+#include "asterisk/module.h"
+#include "asterisk/pbx.h"
+#include "asterisk/sched.h"
+#include "asterisk/io.h"
+#include "asterisk/rtp.h"
+#include "asterisk/acl.h"
+#include "asterisk/callerid.h"
+#include "asterisk/file.h"
+#include "asterisk/cli.h"
+#include "asterisk/app.h"
+#include "asterisk/musiconhold.h"
+#include "asterisk/manager.h"
+#include "asterisk/stringfields.h"
+#include "asterisk/devicestate.h"
+
+static const char tdesc[] = "Local Proxy Channel Driver";
+
+#define IS_OUTBOUND(a,b) (a == b->chan ? 1 : 0)
+
+static struct ast_jb_conf g_jb_conf = {
+	.flags = 0,
+	.max_size = -1,
+	.resync_threshold = -1,
+	.impl = "",
+};
+
+static struct ast_channel *local_request(const char *type, int format, void *data, int *cause);
+static int local_digit_begin(struct ast_channel *ast, char digit);
+static int local_digit_end(struct ast_channel *ast, char digit, unsigned int duration);
+static int local_call(struct ast_channel *ast, char *dest, int timeout);
+static int local_hangup(struct ast_channel *ast);
+static int local_answer(struct ast_channel *ast);
+static struct ast_frame *local_read(struct ast_channel *ast);
+static int local_write(struct ast_channel *ast, struct ast_frame *f);
+static int local_indicate(struct ast_channel *ast, int condition, const void *data, size_t datalen);
+static int local_fixup(struct ast_channel *oldchan, struct ast_channel *newchan);
+static int local_sendhtml(struct ast_channel *ast, int subclass, const char *data, int datalen);
+static int local_sendtext(struct ast_channel *ast, const char *text);
+static int local_devicestate(void *data);
+
+/* PBX interface structure for channel registration */
+static const struct ast_channel_tech local_tech = {
+	.type = "Local",
+	.description = tdesc,
+	.capabilities = -1,
+	.requester = local_request,
+	.send_digit_begin = local_digit_begin,
+	.send_digit_end = local_digit_end,
+	.call = local_call,
+	.hangup = local_hangup,
+	.answer = local_answer,
+	.read = local_read,
+	.write = local_write,
+	.write_video = local_write,
+	.exception = local_read,
+	.indicate = local_indicate,
+	.fixup = local_fixup,
+	.send_html = local_sendhtml,
+	.send_text = local_sendtext,
+	.devicestate = local_devicestate,
+};
+
+struct local_pvt {
+	ast_mutex_t lock;			/* Channel private lock */
+	unsigned int flags;                     /* Private flags */
+	char context[AST_MAX_CONTEXT];		/* Context to call */
+	char exten[AST_MAX_EXTENSION];		/* Extension to call */
+	int reqformat;				/* Requested format */
+	struct ast_jb_conf jb_conf;		/*!< jitterbuffer configuration for this local channel */
+	struct ast_channel *owner;		/* Master Channel */
+	struct ast_channel *chan;		/* Outbound channel */
+	struct ast_module_user *u_owner;	/*! reference to keep the module loaded while in use */
+	struct ast_module_user *u_chan;		/*! reference to keep the module loaded while in use */
+	AST_LIST_ENTRY(local_pvt) list;		/* Next entity */
+};
+
+#define LOCAL_GLARE_DETECT    (1 << 0) /*!< Detect glare on hangup */
+#define LOCAL_CANCEL_QUEUE    (1 << 1) /*!< Cancel queue */
+#define LOCAL_ALREADY_MASQED  (1 << 2) /*!< Already masqueraded */
+#define LOCAL_LAUNCHED_PBX    (1 << 3) /*!< PBX was launched */
+#define LOCAL_NO_OPTIMIZATION (1 << 4) /*!< Do not optimize using masquerading */
+
+static AST_LIST_HEAD_STATIC(locals, local_pvt);
+
+/*! \brief Adds devicestate to local channels */
+static int local_devicestate(void *data)
+{
+	char *exten = ast_strdupa(data);
+	char *context = NULL, *opts = NULL;
+	int res;
+	struct local_pvt *lp;
+
+	if (!(context = strchr(exten, '@'))) {
+		ast_log(LOG_WARNING, "Someone used Local/%s somewhere without a @context. This is bad.\n", exten);
+		return AST_DEVICE_INVALID;	
+	}
+
+	*context++ = '\0';
+
+	/* Strip options if they exist */
+	if ((opts = strchr(context, '/')))
+		*opts = '\0';
+
+	ast_debug(3, "Checking if extension %s@%s exists (devicestate)\n", exten, context);
+
+	res = ast_exists_extension(NULL, context, exten, 1, NULL);
+	if (!res)		
+		return AST_DEVICE_INVALID;
+	
+	res = AST_DEVICE_NOT_INUSE;
+	AST_LIST_LOCK(&locals);
+	AST_LIST_TRAVERSE(&locals, lp, list) {
+		if (!strcmp(exten, lp->exten) && !strcmp(context, lp->context) && lp->owner) {
+			res = AST_DEVICE_INUSE;
+			break;
+		}
+	}
+	AST_LIST_UNLOCK(&locals);
+
+	return res;
+}
+
+static int local_queue_frame(struct local_pvt *p, int isoutbound, struct ast_frame *f, struct ast_channel *us)
+{
+	struct ast_channel *other = NULL;
+
+retrylock:		
+
+	/* Recalculate outbound channel */
+	other = isoutbound ? p->owner : p->chan;
+
+	/* Set glare detection */
+	ast_set_flag(p, LOCAL_GLARE_DETECT);
+	if (ast_test_flag(p, LOCAL_CANCEL_QUEUE)) {
+		/* We had a glare on the hangup.  Forget all this business,
+		return and destroy p.  */
+		ast_mutex_unlock(&p->lock);
+		ast_mutex_destroy(&p->lock);
+		ast_free(p);
+		return -1;
+	}
+	if (!other) {
+		ast_clear_flag(p, LOCAL_GLARE_DETECT);
+		return 0;
+	}
+	if (ast_channel_trylock(other)) {
+		/* Failed to lock.  Release main lock and try again */
+		ast_mutex_unlock(&p->lock);
+		if (us) {
+			if (ast_channel_unlock(us)) {
+				ast_log(LOG_WARNING, "%s wasn't locked while sending %d/%d\n",
+					us->name, f->frametype, f->subclass);
+				us = NULL;
+			}
+		}
+		/* Wait just a bit */
+		usleep(1);
+		/* Only we can destroy ourselves, so we can't disappear here */
+		if (us)
+			ast_channel_lock(us);
+		ast_mutex_lock(&p->lock);
+		goto retrylock;
+	}
+	ast_queue_frame(other, f);
+	ast_channel_unlock(other);
+	ast_clear_flag(p, LOCAL_GLARE_DETECT);
+	return 0;
+}
+
+static int local_answer(struct ast_channel *ast)
+{
+	struct local_pvt *p = ast->tech_pvt;
+	int isoutbound;
+	int res = -1;
+
+	if (!p)
+		return -1;
+
+	ast_mutex_lock(&p->lock);
+	isoutbound = IS_OUTBOUND(ast, p);
+	if (isoutbound) {
+		/* Pass along answer since somebody answered us */
+		struct ast_frame answer = { AST_FRAME_CONTROL, AST_CONTROL_ANSWER };
+		res = local_queue_frame(p, isoutbound, &answer, ast);
+	} else
+		ast_log(LOG_WARNING, "Huh?  Local is being asked to answer?\n");
+	if (!res)
+		ast_mutex_unlock(&p->lock);
+	return res;
+}
+
+static void check_bridge(struct local_pvt *p, int isoutbound)
+{
+	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)))
+		return;
+
+	/* only do the masquerade if we are being called on the outbound channel,
+	   if it has been bridged to another channel and if there are no pending
+	   frames on the owner channel (because they would be transferred to the
+	   outbound channel during the masquerade)
+	*/
+	if (isoutbound && p->chan->_bridge /* Not ast_bridged_channel!  Only go one step! */ && AST_LIST_EMPTY(&p->owner->readq)) {
+		/* Masquerade bridged channel into owner */
+		/* Lock everything we need, one by one, and give up if
+		   we can't get everything.  Remember, we'll get another
+		   chance in just a little bit */
+		if (!ast_channel_trylock(p->chan->_bridge)) {
+			if (!ast_check_hangup(p->chan->_bridge)) {
+				if (!ast_channel_trylock(p->owner)) {
+					if (!ast_check_hangup(p->owner)) {
+						ast_channel_masquerade(p->owner, p->chan->_bridge);
+						ast_set_flag(p, LOCAL_ALREADY_MASQED);
+					}
+					ast_channel_unlock(p->owner);
+				}
+				ast_channel_unlock(p->chan->_bridge);
+			}
+		}
+	/* We only allow masquerading in one 'direction'... it's important to preserve the state
+	   (group variables, etc.) that live on p->chan->_bridge (and were put there by the dialplan)
+	   when the local channels go away.
+	*/
+#if 0
+	} else if (!isoutbound && p->owner && p->owner->_bridge && p->chan && AST_LIST_EMPTY(&p->chan->readq)) {
+		/* Masquerade bridged channel into chan */
+		if (!ast_mutex_trylock(&(p->owner->_bridge)->lock)) {
+			if (!ast_check_hangup(p->owner->_bridge)) {
+				if (!ast_mutex_trylock(&p->chan->lock)) {
+					if (!ast_check_hangup(p->chan)) {
+						ast_channel_masquerade(p->chan, p->owner->_bridge);
+						ast_set_flag(p, LOCAL_ALREADY_MASQED);
+					}
+					ast_mutex_unlock(&p->chan->lock);
+				}
+			}
+			ast_mutex_unlock(&(p->owner->_bridge)->lock);
+		}
+#endif
+	}
+}
+
+static struct ast_frame  *local_read(struct ast_channel *ast)
+{
+	return &ast_null_frame;
+}
+
+static int local_write(struct ast_channel *ast, struct ast_frame *f)
+{
+	struct local_pvt *p = ast->tech_pvt;
+	int res = -1;
+	int isoutbound;
+
+	if (!p)
+		return -1;
+
+	/* Just queue for delivery to the other side */
+	ast_mutex_lock(&p->lock);
+	isoutbound = IS_OUTBOUND(ast, p);
+	if (f && (f->frametype == AST_FRAME_VOICE || f->frametype == AST_FRAME_VIDEO))
+		check_bridge(p, isoutbound);
+	if (!ast_test_flag(p, LOCAL_ALREADY_MASQED))
+		res = local_queue_frame(p, isoutbound, f, ast);
+	else {
+		ast_debug(1, "Not posting to queue since already masked on '%s'\n", ast->name);
+		res = 0;
+	}
+	if (!res)
+		ast_mutex_unlock(&p->lock);
+	return res;
+}
+
+static int local_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
+{
+	struct local_pvt *p = newchan->tech_pvt;
+
+	if (!p)
+		return -1;
+
+	ast_mutex_lock(&p->lock);
+
+	if ((p->owner != oldchan) && (p->chan != oldchan)) {
+		ast_log(LOG_WARNING, "Old channel wasn't %p but was %p/%p\n", oldchan, p->owner, p->chan);
+		ast_mutex_unlock(&p->lock);
+		return -1;
+	}
+	if (p->owner == oldchan)
+		p->owner = newchan;
+	else
+		p->chan = newchan;
+	ast_mutex_unlock(&p->lock);
+	return 0;
+}
+
+static int local_indicate(struct ast_channel *ast, int condition, const void *data, size_t datalen)
+{
+	struct local_pvt *p = ast->tech_pvt;
+	int res = 0;
+	struct ast_frame f = { AST_FRAME_CONTROL, };
+	int isoutbound;
+
+	if (!p)
+		return -1;
+
+	/* If this is an MOH hold or unhold, do it on the Local channel versus real channel */
+	if (condition == AST_CONTROL_HOLD) {
+		ast_moh_start(ast, data, NULL);
+	} else if (condition == AST_CONTROL_UNHOLD) {
+		ast_moh_stop(ast);
+	} 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 = (void*)data;
+		f.datalen = datalen;
+		if (!(res = local_queue_frame(p, isoutbound, &f, ast)))
+			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)))
+		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)))
+		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 = (char *) text;
+	f.datalen = strlen(text) + 1;
+	if (!(res = local_queue_frame(p, isoutbound, &f, ast)))
+		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 = (char *)data;
+	f.datalen = datalen;
+	if (!(res = local_queue_frame(p, isoutbound, &f, ast)))
+		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;
+	
+	ast_mutex_lock(&p->lock);
+
+	/*
+	 * Note that cid_num and cid_name aren't passed in the ast_channel_alloc
+	 * call, so it's done here instead.
+	 */
+	p->chan->cid.cid_num = ast_strdup(p->owner->cid.cid_num);
+	p->chan->cid.cid_name = ast_strdup(p->owner->cid.cid_name);
+	p->chan->cid.cid_rdnis = ast_strdup(p->owner->cid.cid_rdnis);
+	p->chan->cid.cid_ani = ast_strdup(p->owner->cid.cid_ani);
+	p->chan->cid.cid_pres = p->owner->cid.cid_pres;
+	ast_string_field_set(p->chan, language, p->owner->language);
+	ast_string_field_set(p->chan, accountcode, p->owner->accountcode);
+	p->chan->cdrflags = p->owner->cdrflags;
+
+	/* 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);
+	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 };
+	struct ast_channel *ochan = NULL;
+	int glaredetect = 0, res = 0;
+
+	if (!p)
+		return -1;
+
+	ast_mutex_lock(&p->lock);
+	if (p->chan && ast_test_flag(ast, AST_FLAG_ANSWERED_ELSEWHERE)) 
+		ast_set_flag(p->chan, AST_FLAG_ANSWERED_ELSEWHERE);
+	isoutbound = IS_OUTBOUND(ast, p);
+	if (isoutbound) {
+		const char *status = pbx_builtin_getvar_helper(p->chan, "DIALSTATUS");
+		if ((status) && (p->owner)) {
+			/* Deadlock avoidance */
+			while (ast_channel_trylock(p->owner)) {
+				ast_mutex_unlock(&p->lock);
+				usleep(1);
+				ast_mutex_lock(&p->lock);
+			}
+			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);
+	}
+	
+	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);
+		ast_mutex_unlock(&p->lock);
+		/* Remove from list */
+		AST_LIST_LOCK(&locals);
+		AST_LIST_REMOVE(&locals, p, list);
+		AST_LIST_UNLOCK(&locals);
+		/* Grab / release lock just in case */
+		ast_mutex_lock(&p->lock);
+		ast_mutex_unlock(&p->lock);
+		/* And destroy */
+		if (!glaredetect) {
+			ast_mutex_destroy(&p->lock);
+			ast_free(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);
+	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");
+			}
+		}
+	}
+
+	/* 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 (!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);
+		ast_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 = 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)
+			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;
+
+	/* 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)))
+		chan = local_new(p, AST_STATE_DOWN);
+
+	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);
+		AST_LIST_HEAD_DESTROY(&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");