asterisk/channels/chan_gtalk.c

/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, Digium, Inc.
 *
 * Matt O'Gorman <mogorman@digium.com>
 * Philippe Sultan <philippe.sultan@gmail.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 Matt O'Gorman <mogorman@digium.com>
 * \author Philippe Sultan <philippe.sultan@gmail.com>
 *
 * \brief Gtalk Channel Driver, until google/libjingle works with jingle spec
 *
 * \ingroup channel_drivers
 *
 * ********** General TODO:s
 * \todo Support config reloading.
 * \todo Fix native bridging.
 */

/*! \li \ref chan_gtalk.c uses the configuration file \ref gtalk.conf
 * \addtogroup configuration_file
 */

/*! \page gtalk.conf gtalk.conf
 * \verbinclude gtalk.conf.sample
 */

/*** MODULEINFO
        <defaultenabled>no</defaultenabled>
	<depend>iksemel</depend>
	<depend>res_jabber</depend>
	<use type="external">openssl</use>
	<support_level>deprecated</support_level>
	<replacement>chan_motif</replacement>
 ***/

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision$")

#include <sys/socket.h>
#include <fcntl.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/signal.h>
#include <iksemel.h>
#include <pthread.h>
#include <ctype.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_engine.h"
#include "asterisk/stun.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/utils.h"
#include "asterisk/causes.h"
#include "asterisk/astobj.h"
#include "asterisk/abstract_jb.h"
#include "asterisk/jabber.h"
#include "asterisk/jingle.h"
#include "asterisk/parking.h"
#include "asterisk/stasis_channels.h"

#define GOOGLE_CONFIG		"gtalk.conf"

/*! Global jitterbuffer configuration - by default, jb is disabled */
static struct ast_jb_conf default_jbconf =
{
	.flags = 0,
	.max_size = -1,
	.resync_threshold = -1,
	.impl = "",
	.target_extra = -1,
};
static struct ast_jb_conf global_jbconf;

enum gtalk_protocol {
	AJI_PROTOCOL_UDP = 1,
	AJI_PROTOCOL_SSLTCP = 2,
};

enum gtalk_connect_type {
	AJI_CONNECT_STUN = 1,
	AJI_CONNECT_LOCAL = 2,
	AJI_CONNECT_RELAY = 3,
};

struct gtalk_pvt {
	ast_mutex_t lock;                /*!< Channel private lock */
	time_t laststun;
	struct gtalk *parent;	         /*!< Parent client */
	char sid[100];
	char us[AJI_MAX_JIDLEN];
	char them[AJI_MAX_JIDLEN];
	char ring[10];                   /*!< Message ID of ring */
	iksrule *ringrule;               /*!< Rule for matching RING request */
	int initiator;                   /*!< If we're the initiator */
	int alreadygone;
	struct ast_codec_pref prefs;
	struct gtalk_candidate *theircandidates;
	struct gtalk_candidate *ourcandidates;
	char cid_num[80];                /*!< Caller ID num */
	char cid_name[80];               /*!< Caller ID name */
	char exten[80];                  /*!< Called extension */
	struct ast_channel *owner;       /*!< Master Channel */
	struct ast_rtp_instance *rtp;             /*!< RTP audio session */
	struct ast_rtp_instance *vrtp;            /*!< RTP video session */
	struct ast_format_cap *cap;
	struct ast_format_cap *jointcap;             /*!< Supported capability at both ends (codecs ) */
	struct ast_format_cap *peercap;
	struct gtalk_pvt *next;	/* Next entity */
};

struct gtalk_candidate {
	char name[100];
	enum gtalk_protocol protocol;
	double preference;
	char username[100];
	char password[100];
	enum gtalk_connect_type type;
	char network[6];
	int generation;
	char ip[16];
	int port;
	int receipt;
	struct gtalk_candidate *next;
};

struct gtalk {
	ASTOBJ_COMPONENTS(struct gtalk);
	struct aji_client *connection;
	struct aji_buddy *buddy;
	struct gtalk_pvt *p;
	struct ast_codec_pref prefs;
	int amaflags;			/*!< AMA Flags */
	char user[AJI_MAX_JIDLEN];
	char context[AST_MAX_CONTEXT];
	char parkinglot[AST_MAX_CONTEXT];	/*!<  Parkinglot */
	char accountcode[AST_MAX_ACCOUNT_CODE];	/*!< Account code */
	struct ast_format_cap *cap;
	ast_group_t callgroup;	/*!< Call group */
	ast_group_t pickupgroup;	/*!< Pickup group */
	int callingpres;		/*!< Calling presentation */
	int allowguest;
	char language[MAX_LANGUAGE];	/*!<  Default language for prompts */
	char musicclass[MAX_MUSICCLASS];	/*!<  Music on Hold class */
};

struct gtalk_container {
	ASTOBJ_CONTAINER_COMPONENTS(struct gtalk);
};

static const char desc[]		= "Gtalk Channel";
static const char DEFAULT_CONTEXT[]	= "default";
static const int DEFAULT_ALLOWGUEST	= 1;

static struct ast_format_cap *global_capability;

AST_MUTEX_DEFINE_STATIC(gtalklock); /*!< Protect the interface list (of gtalk_pvt's) */

/* Forward declarations */
static struct ast_channel *gtalk_request(const char *type, struct ast_format_cap *cap, const struct ast_channel *requestor, const char *data, int *cause);
/*static int gtalk_digit(struct ast_channel *ast, char digit, unsigned int duration);*/
static int gtalk_sendtext(struct ast_channel *ast, const char *text);
static int gtalk_digit_begin(struct ast_channel *ast, char digit);
static int gtalk_digit_end(struct ast_channel *ast, char digit, unsigned int duration);
static int gtalk_call(struct ast_channel *ast, const char *dest, int timeout);
static int gtalk_hangup(struct ast_channel *ast);
static int gtalk_answer(struct ast_channel *ast);
static int gtalk_action(struct gtalk *client, struct gtalk_pvt *p, const char *action);
static void gtalk_free_pvt(struct gtalk *client, struct gtalk_pvt *p);
static int gtalk_newcall(struct gtalk *client, ikspak *pak);
static struct ast_frame *gtalk_read(struct ast_channel *ast);
static int gtalk_write(struct ast_channel *ast, struct ast_frame *f);
static int gtalk_indicate(struct ast_channel *ast, int condition, const void *data, size_t datalen);
static int gtalk_fixup(struct ast_channel *oldchan, struct ast_channel *newchan);
static int gtalk_sendhtml(struct ast_channel *ast, int subclass, const char *data, int datalen);
static struct gtalk_pvt *gtalk_alloc(struct gtalk *client, const char *us, const char *them, const char *sid);
static int gtalk_update_stun(struct gtalk *client, struct gtalk_pvt *p);
/* static char *gtalk_do_reload(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a); */
static char *gtalk_show_channels(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
static char *gtalk_show_settings(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
static int gtalk_update_externip(void);
static int gtalk_parser(void *data, ikspak *pak);
static int gtalk_create_candidates(struct gtalk *client, struct gtalk_pvt *p, char *sid, char *from, char *to);
static void gtalk_set_owner(struct gtalk_pvt *p, struct ast_channel *chan);

/*! \brief PBX interface structure for channel registration */
static struct ast_channel_tech gtalk_tech = {
	.type = "Gtalk",
	.description = "Gtalk Channel Driver",
	.requester = gtalk_request,
	.send_text = gtalk_sendtext,
	.send_digit_begin = gtalk_digit_begin,
	.send_digit_end = gtalk_digit_end,
	/* XXX TODO native bridging is causing odd problems with DTMF pass-through with
	 * the gtalk servers. Enable native bridging once the source of this problem has
	 * been identified.
	.bridge = ast_rtp_instance_bridge, */
	.call = gtalk_call,
	.hangup = gtalk_hangup,
	.answer = gtalk_answer,
	.read = gtalk_read,
	.write = gtalk_write,
	.exception = gtalk_read,
	.indicate = gtalk_indicate,
	.fixup = gtalk_fixup,
	.send_html = gtalk_sendhtml,
	.properties = AST_CHAN_TP_WANTSJITTER | AST_CHAN_TP_CREATESJITTER
};

static struct sockaddr_in bindaddr = { 0, };	/*!< The address we bind to */

static struct ast_sched_context *sched;	/*!< The scheduling context */
static struct io_context *io;	/*!< The IO context */
static struct in_addr __ourip;

static struct ast_cli_entry gtalk_cli[] = {
/*	AST_CLI_DEFINE(gtalk_do_reload, "Reload GoogleTalk configuration"), XXX TODO reloads are not possible yet. */
	AST_CLI_DEFINE(gtalk_show_channels, "Show GoogleTalk channels"),
	AST_CLI_DEFINE(gtalk_show_settings, "Show GoogleTalk global settings"),
};

static char externip[16];
static char global_context[AST_MAX_CONTEXT];
static char global_parkinglot[AST_MAX_CONTEXT];
static int global_allowguest;
static struct sockaddr_in stunaddr; /*!< the stun server we get the externip from */
static int global_stunaddr;

static struct gtalk_container gtalk_list;

static void gtalk_member_destroy(struct gtalk *obj)
{
	obj->cap = ast_format_cap_destroy(obj->cap);
	if (obj->connection) {
		ASTOBJ_UNREF(obj->connection, ast_aji_client_destroy);
	}
	if (obj->buddy) {
		ASTOBJ_UNREF(obj->buddy, ast_aji_buddy_destroy);
	}
	ast_free(obj);
}

/* XXX This could be a source of reference leaks given that the CONTAINER_FIND
 * macros bump the refcount while the traversal does not. */
static struct gtalk *find_gtalk(char *name, char *connection)
{
	struct gtalk *gtalk = NULL;
	char *domain = NULL , *s = NULL;

	if (strchr(connection, '@')) {
		s = ast_strdupa(connection);
		domain = strsep(&s, "@");
		ast_verbose("OOOOH domain = %s\n", domain);
	}
	gtalk = ASTOBJ_CONTAINER_FIND(&gtalk_list, name);
	if (!gtalk && strchr(name, '@'))
		gtalk = ASTOBJ_CONTAINER_FIND_FULL(&gtalk_list, name, user,,, strcasecmp);

	if (!gtalk) {
		/* guest call */
		ASTOBJ_CONTAINER_TRAVERSE(&gtalk_list, 1, {
			ASTOBJ_RDLOCK(iterator);
			if (!strcasecmp(iterator->name, "guest")) {
				gtalk = iterator;
			}
			ASTOBJ_UNLOCK(iterator);

			if (gtalk)
				break;
		});

	}
	return gtalk;
}


static int add_codec_to_answer(const struct gtalk_pvt *p, struct ast_format *codec, iks *dcodecs)
{
	int res = 0;
	const char *format = ast_getformatname(codec);

	if (!strcasecmp("ulaw", format)) {
		iks *payload_eg711u, *payload_pcmu;
		payload_pcmu = iks_new("payload-type");
		payload_eg711u = iks_new("payload-type");

		if(!payload_eg711u || !payload_pcmu) {
			iks_delete(payload_pcmu);
			iks_delete(payload_eg711u);
			ast_log(LOG_WARNING,"Failed to allocate iks node\n");
			return -1;
		}
		iks_insert_attrib(payload_pcmu, "id", "0");
		iks_insert_attrib(payload_pcmu, "name", "PCMU");
		iks_insert_attrib(payload_pcmu, "clockrate","8000");
		iks_insert_attrib(payload_pcmu, "bitrate","64000");
		iks_insert_attrib(payload_eg711u, "id", "100");
		iks_insert_attrib(payload_eg711u, "name", "EG711U");
		iks_insert_attrib(payload_eg711u, "clockrate","8000");
		iks_insert_attrib(payload_eg711u, "bitrate","64000");
		iks_insert_node(dcodecs, payload_pcmu);
		iks_insert_node(dcodecs, payload_eg711u);
		res ++;
	}
	if (!strcasecmp("alaw", format)) {
		iks *payload_eg711a, *payload_pcma;
		payload_pcma = iks_new("payload-type");
		payload_eg711a = iks_new("payload-type");
		if(!payload_eg711a || !payload_pcma) {
			iks_delete(payload_eg711a);
			iks_delete(payload_pcma);
			ast_log(LOG_WARNING,"Failed to allocate iks node\n");
			return -1;
		}
		iks_insert_attrib(payload_pcma, "id", "8");
		iks_insert_attrib(payload_pcma, "name", "PCMA");
		iks_insert_attrib(payload_pcma, "clockrate","8000");
		iks_insert_attrib(payload_pcma, "bitrate","64000");
		payload_eg711a = iks_new("payload-type");
		iks_insert_attrib(payload_eg711a, "id", "101");
		iks_insert_attrib(payload_eg711a, "name", "EG711A");
		iks_insert_attrib(payload_eg711a, "clockrate","8000");
		iks_insert_attrib(payload_eg711a, "bitrate","64000");
		iks_insert_node(dcodecs, payload_pcma);
		iks_insert_node(dcodecs, payload_eg711a);
		res ++;
	}
	if (!strcasecmp("ilbc", format)) {
		iks *payload_ilbc = iks_new("payload-type");
		if(!payload_ilbc) {
			ast_log(LOG_WARNING,"Failed to allocate iks node\n");
			return -1;
		}
		iks_insert_attrib(payload_ilbc, "id", "97");
		iks_insert_attrib(payload_ilbc, "name", "iLBC");
		iks_insert_attrib(payload_ilbc, "clockrate","8000");
		iks_insert_attrib(payload_ilbc, "bitrate","13300");
		iks_insert_node(dcodecs, payload_ilbc);
		res ++;
	}
	if (!strcasecmp("g723", format)) {
		iks *payload_g723 = iks_new("payload-type");
		if(!payload_g723) {
			ast_log(LOG_WARNING,"Failed to allocate iks node\n");
			return -1;
		}
		iks_insert_attrib(payload_g723, "id", "4");
		iks_insert_attrib(payload_g723, "name", "G723");
		iks_insert_attrib(payload_g723, "clockrate","8000");
		iks_insert_attrib(payload_g723, "bitrate","6300");
		iks_insert_node(dcodecs, payload_g723);
		res ++;
	}
	if (!strcasecmp("speex", format)) {
		iks *payload_speex = iks_new("payload-type");
		if(!payload_speex) {
			ast_log(LOG_WARNING,"Failed to allocate iks node\n");
			return -1;
		}
		iks_insert_attrib(payload_speex, "id", "110");
		iks_insert_attrib(payload_speex, "name", "speex");
		iks_insert_attrib(payload_speex, "clockrate","8000");
		iks_insert_attrib(payload_speex, "bitrate","11000");
		iks_insert_node(dcodecs, payload_speex);
		res++;
	}
	if (!strcasecmp("gsm", format)) {
		iks *payload_gsm = iks_new("payload-type");
		if(!payload_gsm) {
			ast_log(LOG_WARNING,"Failed to allocate iks node\n");
			return -1;
		}
		iks_insert_attrib(payload_gsm, "id", "103");
		iks_insert_attrib(payload_gsm, "name", "gsm");
		iks_insert_node(dcodecs, payload_gsm);
		res++;
	}

	return res;
}

static int gtalk_invite(struct gtalk_pvt *p, char *to, char *from, char *sid, int initiator)
{
	struct gtalk *client = p->parent;
	iks *iq, *gtalk, *dcodecs, *payload_telephone, *transport;
	int x;
	struct ast_format_cap *alreadysent;
	int codecs_num = 0;
	char *lowerto = NULL;
	struct ast_format tmpfmt;

	iq = iks_new("iq");
	gtalk = iks_new("session");
	dcodecs = iks_new("description");
	transport = iks_new("transport");
	payload_telephone = iks_new("payload-type");
	if (!(iq && gtalk && dcodecs && transport && payload_telephone)) {
		iks_delete(iq);
		iks_delete(gtalk);
		iks_delete(dcodecs);
		iks_delete(transport);
		iks_delete(payload_telephone);

		ast_log(LOG_ERROR, "Could not allocate iksemel nodes\n");
		return 0;
	}
	iks_insert_attrib(dcodecs, "xmlns", GOOGLE_AUDIO_NS);
	iks_insert_attrib(dcodecs, "xml:lang", "en");

	if (!(alreadysent = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_NOLOCK))) {
		return 0;
	}
	for (x = 0; x < AST_CODEC_PREF_SIZE; x++) {
		if (!(ast_codec_pref_index(&client->prefs, x, &tmpfmt))) {
			break;
		}
		if (!(ast_format_cap_iscompatible(client->cap, &tmpfmt))) {
			continue;
		}
		if (ast_format_cap_iscompatible(alreadysent, &tmpfmt)) {
			continue;
		}
		codecs_num = add_codec_to_answer(p, &tmpfmt, dcodecs);
		ast_format_cap_add(alreadysent, &tmpfmt);
	}
	alreadysent = ast_format_cap_destroy(alreadysent);

	if (codecs_num) {
		/* only propose DTMF within an audio session */
		iks_insert_attrib(payload_telephone, "id", "101");
		iks_insert_attrib(payload_telephone, "name", "telephone-event");
		iks_insert_attrib(payload_telephone, "clockrate", "8000");
	}
	iks_insert_attrib(transport,"xmlns",GOOGLE_TRANSPORT_NS);

	iks_insert_attrib(iq, "type", "set");
	iks_insert_attrib(iq, "to", to);
	iks_insert_attrib(iq, "from", from);
	iks_insert_attrib(iq, "id", client->connection->mid);
	ast_aji_increment_mid(client->connection->mid);

	iks_insert_attrib(gtalk, "xmlns", GOOGLE_NS);
	iks_insert_attrib(gtalk, "type",initiator ? "initiate": "accept");
	/* put the initiator attribute to lower case if we receive the call
	 * otherwise GoogleTalk won't establish the session */
	if (!initiator) {
	        char c;
	        char *t = lowerto = ast_strdupa(to);
		while (((c = *t) != '/') && (*t++ = tolower(c)));
	}
	iks_insert_attrib(gtalk, "initiator", initiator ? from : lowerto);
	iks_insert_attrib(gtalk, "id", sid);
	iks_insert_node(iq, gtalk);
	iks_insert_node(gtalk, dcodecs);
	iks_insert_node(dcodecs, payload_telephone);

	ast_aji_send(client->connection, iq);

	iks_delete(payload_telephone);
	iks_delete(transport);
	iks_delete(dcodecs);
	iks_delete(gtalk);
	iks_delete(iq);
	return 1;
}

static int gtalk_ringing_ack(void *data, ikspak *pak)
{
	struct gtalk_pvt *p = data;
	struct ast_channel *owner;

	ast_mutex_lock(&p->lock);

	if (p->ringrule) {
		iks_filter_remove_rule(p->parent->connection->f, p->ringrule);
	}
	p->ringrule = NULL;

	/* this may be a redirect */
	if (!strcmp(S_OR(iks_find_attrib(pak->x, "type"), ""), "error")) {
		char *name = NULL;
		char *redirect = NULL;
		iks *traversenodes = NULL;
		traversenodes = pak->query;
		while (traversenodes) {
			if (!(name = iks_name(traversenodes))) {
				break;
			}
			if (!strcasecmp(name, "error") &&
				((redirect = iks_find_cdata(traversenodes, "redirect")) ||
				  (redirect = iks_find_cdata(traversenodes, "sta:redirect"))) &&
				(redirect = strstr(redirect, "xmpp:"))) {
				redirect += 5;
				ast_debug(1, "redirect %s\n", redirect);
				ast_copy_string(p->them, redirect, sizeof(p->them));

				gtalk_invite(p, p->them, p->us, p->sid, 1);
				break;
			}
			traversenodes = iks_next_tag(traversenodes);
		}
	}
	gtalk_create_candidates(p->parent, p, p->sid, p->them, p->us);
	owner = p->owner;
	ast_mutex_unlock(&p->lock);

	if (owner) {
		ast_queue_control(owner, AST_CONTROL_RINGING);
	}

	return IKS_FILTER_EAT;
}

static int gtalk_answer(struct ast_channel *ast)
{
	struct gtalk_pvt *p = ast_channel_tech_pvt(ast);
	int res = 0;

	ast_debug(1, "Answer!\n");
	ast_mutex_lock(&p->lock);
	gtalk_invite(p, p->them, p->us,p->sid, 0);
	ast_mutex_unlock(&p->lock);
	return res;
}

static enum ast_rtp_glue_result gtalk_get_rtp_peer(struct ast_channel *chan, struct ast_rtp_instance **instance)
{
	struct gtalk_pvt *p = ast_channel_tech_pvt(chan);
	enum ast_rtp_glue_result res = AST_RTP_GLUE_RESULT_FORBID;

	if (!p)
		return res;

	ast_mutex_lock(&p->lock);
	if (p->rtp){
		ao2_ref(p->rtp, +1);
		*instance = p->rtp;
		res = AST_RTP_GLUE_RESULT_LOCAL;
	}
	ast_mutex_unlock(&p->lock);

	return res;
}

static void gtalk_get_codec(struct ast_channel *chan, struct ast_format_cap *result)
{
	struct gtalk_pvt *p = ast_channel_tech_pvt(chan);
	ast_mutex_lock(&p->lock);
	ast_format_cap_copy(result, p->peercap);
	ast_mutex_unlock(&p->lock);
}

static int gtalk_set_rtp_peer(struct ast_channel *chan, struct ast_rtp_instance *rtp, struct ast_rtp_instance *vrtp, struct ast_rtp_instance *trtp, const struct ast_format_cap *cap, int nat_active)
{
	struct gtalk_pvt *p;

	p = ast_channel_tech_pvt(chan);
	if (!p)
		return -1;
	ast_mutex_lock(&p->lock);

/*	if (rtp)
		ast_rtp_get_peer(rtp, &p->redirip);
	else
		memset(&p->redirip, 0, sizeof(p->redirip));
	p->redircodecs = codecs; */

	/* Reset lastrtprx timer */
	ast_mutex_unlock(&p->lock);
	return 0;
}

static struct ast_rtp_glue gtalk_rtp_glue = {
	.type = "Gtalk",
	.get_rtp_info = gtalk_get_rtp_peer,
	.get_codec = gtalk_get_codec,
	.update_peer = gtalk_set_rtp_peer,
};

static int gtalk_response(struct gtalk *client, char *from, ikspak *pak, const char *reasonstr, const char *reasonstr2)
{
	iks *response = NULL, *error = NULL, *reason = NULL;
	int res = -1;

	response = iks_new("iq");
	if (response) {
		iks_insert_attrib(response, "type", "result");
		iks_insert_attrib(response, "from", from);
		iks_insert_attrib(response, "to", S_OR(iks_find_attrib(pak->x, "from"), ""));
		iks_insert_attrib(response, "id", S_OR(iks_find_attrib(pak->x, "id"), ""));
		if (reasonstr) {
			error = iks_new("error");
			if (error) {
				iks_insert_attrib(error, "type", "cancel");
				reason = iks_new(reasonstr);
				if (reason)
					iks_insert_node(error, reason);
				iks_insert_node(response, error);
			}
		}
		ast_aji_send(client->connection, response);
		res = 0;
	}

	iks_delete(reason);
	iks_delete(error);
	iks_delete(response);

	return res;
}

static int gtalk_is_answered(struct gtalk *client, ikspak *pak)
{
	struct gtalk_pvt *tmp = NULL;
	char *from;
	iks *codec;
	char s1[BUFSIZ], s2[BUFSIZ], s3[BUFSIZ];
	int peernoncodeccapability;

	ast_debug(1, "The client is %s\n", client->name);

	/* Make sure our new call does exist */
	for (tmp = client->p; tmp; tmp = tmp->next) {
		if (iks_find_with_attrib(pak->x, "session", "id", tmp->sid)) {
			break;
		} else if (iks_find_with_attrib(pak->x, "ses:session", "id", tmp->sid)) {
			break;
		}
	}

	if (!tmp) {
		ast_log(LOG_WARNING, "Could not find session in iq\n");
		return -1;
	}

	/* codec points to the first <payload-type/> tag */
	codec = iks_first_tag(iks_first_tag(iks_first_tag(pak->x)));
	while (codec) {
		char *codec_id = iks_find_attrib(codec, "id");
		char *codec_name = iks_find_attrib(codec, "name");
		if (!codec_id || !codec_name) {
			codec = iks_next_tag(codec);
			continue;
		}

		ast_rtp_codecs_payloads_set_m_type(
			ast_rtp_instance_get_codecs(tmp->rtp),
			tmp->rtp,
			atoi(codec_id));
		ast_rtp_codecs_payloads_set_rtpmap_type(
			ast_rtp_instance_get_codecs(tmp->rtp),
			tmp->rtp,
			atoi(codec_id),
			"audio",
			codec_name,
			0);
		codec = iks_next_tag(codec);
	}

	/* Now gather all of the codecs that we are asked for */
	ast_rtp_codecs_payload_formats(ast_rtp_instance_get_codecs(tmp->rtp), tmp->peercap, &peernoncodeccapability);

	/* at this point, we received an answer from the remote Gtalk client,
	   which allows us to compare capabilities */
	ast_format_cap_joint_copy(tmp->cap, tmp->peercap, tmp->jointcap);
	if (ast_format_cap_is_empty(tmp->jointcap)) {
		ast_log(LOG_WARNING, "Capabilities don't match : us - %s, peer - %s, combined - %s \n", ast_getformatname_multiple(s1, BUFSIZ, tmp->cap),
			ast_getformatname_multiple(s2, BUFSIZ, tmp->peercap),
			ast_getformatname_multiple(s3, BUFSIZ, tmp->jointcap));
		/* close session if capabilities don't match */
		ast_queue_hangup(tmp->owner);

		return -1;

	}

	from = iks_find_attrib(pak->x, "to");
	if (!from) {
		from = client->connection->jid->full;
	}

	if (tmp->owner) {
		ast_queue_control(tmp->owner, AST_CONTROL_ANSWER);
	}
	gtalk_update_stun(tmp->parent, tmp);
	gtalk_response(client, from, pak, NULL, NULL);
	return 1;
}

static int gtalk_is_accepted(struct gtalk *client, ikspak *pak)
{
	struct gtalk_pvt *tmp;
	char *from;

	ast_debug(1, "The client is %s\n", client->name);
	/* find corresponding call */
	for (tmp = client->p; tmp; tmp = tmp->next) {
		if (iks_find_with_attrib(pak->x, "session", "id", tmp->sid)) {
			break;
		}
	}

	from = iks_find_attrib(pak->x, "to");
	if (!from) {
		from = client->connection->jid->full;
	}

	if (tmp) {
		gtalk_update_stun(tmp->parent, tmp);
	} else {
		ast_log(LOG_NOTICE, "Whoa, didn't find call during accept?!\n");
	}

	/* answer 'iq' packet to let the remote peer know that we're alive */
	gtalk_response(client, from, pak, NULL, NULL);
	return 1;
}

static int gtalk_handle_dtmf(struct gtalk *client, ikspak *pak)
{
	struct gtalk_pvt *tmp;
	iks *dtmfnode = NULL, *dtmfchild = NULL;
	char *dtmf;
	char *from;
	/* Make sure our new call doesn't exist yet */
	for (tmp = client->p; tmp; tmp = tmp->next) {
		if (iks_find_with_attrib(pak->x, "session", "id", tmp->sid) || iks_find_with_attrib(pak->x, "gtalk", "sid", tmp->sid))
			break;
	}
	from = iks_find_attrib(pak->x, "to");
	if (!from) {
		from = client->connection->jid->full;
	}

	if (tmp) {
		if(iks_find_with_attrib(pak->x, "dtmf-method", "method", "rtp")) {
			gtalk_response(client, from, pak,
					"feature-not-implemented xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'",
					"unsupported-dtmf-method xmlns='http://jabber.org/protocol/gtalk/info/dtmf#errors'");
			return -1;
		}
		if ((dtmfnode = iks_find(pak->x, "dtmf"))) {
			if((dtmf = iks_find_attrib(dtmfnode, "code"))) {
				if(iks_find_with_attrib(pak->x, "dtmf", "action", "button-up")) {
					struct ast_frame f = {AST_FRAME_DTMF_BEGIN, };
					f.subclass.integer = dtmf[0];
					ast_queue_frame(tmp->owner, &f);
					ast_verbose("GOOGLE! DTMF-relay event received: %c\n", (int) f.subclass.integer);
				} else if(iks_find_with_attrib(pak->x, "dtmf", "action", "button-down")) {
					struct ast_frame f = {AST_FRAME_DTMF_END, };
					f.subclass.integer = dtmf[0];
					ast_queue_frame(tmp->owner, &f);
					ast_verbose("GOOGLE! DTMF-relay event received: %c\n", (int) f.subclass.integer);
				} else if(iks_find_attrib(pak->x, "dtmf")) { /* 250 millasecond default */
					struct ast_frame f = {AST_FRAME_DTMF, };
					f.subclass.integer = dtmf[0];
					ast_queue_frame(tmp->owner, &f);
					ast_verbose("GOOGLE! DTMF-relay event received: %c\n", (int) f.subclass.integer);
				}
			}
		} else if ((dtmfnode = iks_find_with_attrib(pak->x, "gtalk", "action", "session-info"))) {
			if((dtmfchild = iks_find(dtmfnode, "dtmf"))) {
				if((dtmf = iks_find_attrib(dtmfchild, "code"))) {
					if(iks_find_with_attrib(dtmfnode, "dtmf", "action", "button-up")) {
						struct ast_frame f = {AST_FRAME_DTMF_END, };
						f.subclass.integer = dtmf[0];
						ast_queue_frame(tmp->owner, &f);
						ast_verbose("GOOGLE! DTMF-relay event received: %c\n", (int) f.subclass.integer);
					} else if(iks_find_with_attrib(dtmfnode, "dtmf", "action", "button-down")) {
						struct ast_frame f = {AST_FRAME_DTMF_BEGIN, };
						f.subclass.integer = dtmf[0];
						ast_queue_frame(tmp->owner, &f);
						ast_verbose("GOOGLE! DTMF-relay event received: %c\n", (int) f.subclass.integer);
					}
				}
			}
		}
		gtalk_response(client, from, pak, NULL, NULL);
		return 1;
	} else {
		ast_log(LOG_NOTICE, "Whoa, didn't find call!\n");
	}

	gtalk_response(client, from, pak, NULL, NULL);
	return 1;
}

static int gtalk_hangup_farend(struct gtalk *client, ikspak *pak)
{
	struct gtalk_pvt *tmp;
	char *from;

	ast_debug(1, "The client is %s\n", client->name);
	/* Make sure our new call doesn't exist yet */
	for (tmp = client->p; tmp; tmp = tmp->next) {
		if (iks_find_with_attrib(pak->x, "session", "id", tmp->sid) ||
			(iks_find_attrib(pak->query, "id") && !strcmp(iks_find_attrib(pak->query, "id"), tmp->sid))) {
			break;
		}
	}
	from = iks_find_attrib(pak->x, "to");
	if (!from) {
		from = client->connection->jid->full;
	}

	if (tmp) {
		tmp->alreadygone = 1;
		if (tmp->owner) {
			ast_queue_hangup(tmp->owner);
		}
	} else {
		ast_log(LOG_NOTICE, "Whoa, didn't find call during hangup!\n");
	}
	gtalk_response(client, from, pak, NULL, NULL);
	return 1;
}

static int gtalk_get_local_ip(struct ast_sockaddr *ourip)
{
	struct ast_sockaddr root;
	struct ast_sockaddr bindaddr_tmp;
	struct ast_sockaddr *addrs;

	/* If bind address is not 0.0.0.0, then bindaddr is our local ip. */
	ast_sockaddr_from_sin(&bindaddr_tmp, &bindaddr);
	if (!ast_sockaddr_is_any(&bindaddr_tmp)) {
		ast_sockaddr_copy(ourip, &bindaddr_tmp);
		return 0;
	}

	/* If no bind address was provided, lets see what ip we would use to connect to google.com and use that.
	 * If you can't resolve google.com from your network, then this module is useless for you anyway. */
	if (ast_sockaddr_resolve(&addrs, "google.com", PARSE_PORT_FORBID, AF_INET) > 0) {
		ast_sockaddr_copy(&root, &addrs[0]);
		ast_free(addrs);
		if (!ast_ouraddrfor(&root, ourip)) {
			return 0;
		}
	}

	/* As a last resort, use this function to find our local address. */
	return ast_find_ourip(ourip, &bindaddr_tmp, AF_INET);
}

static int gtalk_create_candidates(struct gtalk *client, struct gtalk_pvt *p, char *sid, char *from, char *to)
{
	struct gtalk_candidate *tmp;
	struct aji_client *c = client->connection;
	struct gtalk_candidate *ours1 = NULL, *ours2 = NULL;
	struct sockaddr_in sin = { 0, };
	struct ast_sockaddr sin_tmp;
	struct ast_sockaddr us;
	iks *iq, *gtalk, *candidate, *transport;
	char user[17], pass[17], preference[5], port[7];
	char *lowerfrom = NULL;

	iq = iks_new("iq");
	gtalk = iks_new("session");
	candidate = iks_new("candidate");
	transport = iks_new("transport");
	if (!iq || !gtalk || !candidate || !transport) {
		ast_log(LOG_ERROR, "Memory allocation error\n");
		goto safeout;
	}
	ours1 = ast_calloc(1, sizeof(*ours1));
	ours2 = ast_calloc(1, sizeof(*ours2));
	if (!ours1 || !ours2)
		goto safeout;

	iks_insert_attrib(transport, "xmlns",GOOGLE_TRANSPORT_NS);
	iks_insert_node(iq, gtalk);
	iks_insert_node(gtalk,candidate);
	iks_insert_node(gtalk,transport);

	for (; p; p = p->next) {
		if (!strcasecmp(p->sid, sid))
			break;
	}

	if (!p) {
		ast_log(LOG_NOTICE, "No matching gtalk session - SID %s!\n", sid);
		goto safeout;
	}

	ast_rtp_instance_get_local_address(p->rtp, &sin_tmp);
	ast_sockaddr_to_sin(&sin_tmp, &sin);

	gtalk_get_local_ip(&us);

	if (!strcmp(ast_sockaddr_stringify_addr(&us), "127.0.0.1")) {
		ast_log(LOG_WARNING, "Found a loopback IP on the system, check your network configuration or set the bindaddr attribute.\n");
	}

	/* Setup our gtalk candidates */
	ast_copy_string(ours1->name, "rtp", sizeof(ours1->name));
	ours1->port = ntohs(sin.sin_port);
	ours1->preference = 1;
	snprintf(user, sizeof(user), "%08lx%08lx", ast_random(), ast_random());
	snprintf(pass, sizeof(pass), "%08lx%08lx", ast_random(), ast_random());
	ast_copy_string(ours1->username, user, sizeof(ours1->username));
	ast_copy_string(ours1->password, pass, sizeof(ours1->password));
	ast_copy_string(ours1->ip, ast_sockaddr_stringify_addr(&us),
			sizeof(ours1->ip));
	ours1->protocol = AJI_PROTOCOL_UDP;
	ours1->type = AJI_CONNECT_LOCAL;
	ours1->generation = 0;
	p->ourcandidates = ours1;

	/* XXX this is a blocking action.  We send a STUN request to the server
	 * and wait for the response.  If blocking here is a problem the STUN requests/responses
	 * for the externip may need to be done differently. */
	gtalk_update_externip();
	if (!ast_strlen_zero(externip)) {
		ast_copy_string(ours2->username, user, sizeof(ours2->username));
		ast_copy_string(ours2->password, pass, sizeof(ours2->password));
		ast_copy_string(ours2->ip, externip, sizeof(ours2->ip));
		ast_copy_string(ours2->name, "rtp", sizeof(ours1->name));
		ours2->port = ntohs(sin.sin_port);
		ours2->preference = 0.9;
		ours2->protocol = AJI_PROTOCOL_UDP;
		ours2->type = AJI_CONNECT_STUN;
		ours2->generation = 0;
		ours1->next = ours2;
		ours2 = NULL;
	}
	ours1 = NULL;

	for (tmp = p->ourcandidates; tmp; tmp = tmp->next) {
		snprintf(port, sizeof(port), "%d", tmp->port);
		snprintf(preference, sizeof(preference), "%.2f", tmp->preference);
		iks_insert_attrib(iq, "from", to);
		iks_insert_attrib(iq, "to", from);
		iks_insert_attrib(iq, "type", "set");
		iks_insert_attrib(iq, "id", c->mid);
		ast_aji_increment_mid(c->mid);
		iks_insert_attrib(gtalk, "type", "candidates");
		iks_insert_attrib(gtalk, "id", sid);
		/* put the initiator attribute to lower case if we receive the call
		 * otherwise GoogleTalk won't establish the session */
		if (!p->initiator) {
			char cur;
			char *t = lowerfrom = ast_strdupa(from);
			while (((cur = *t) != '/') && (*t++ = tolower(cur)));
		}
		iks_insert_attrib(gtalk, "initiator", (p->initiator) ? to : lowerfrom);
		iks_insert_attrib(gtalk, "xmlns", GOOGLE_NS);
		iks_insert_attrib(candidate, "name", tmp->name);
		iks_insert_attrib(candidate, "address", tmp->ip);
		iks_insert_attrib(candidate, "port", port);
		iks_insert_attrib(candidate, "username", tmp->username);
		iks_insert_attrib(candidate, "password", tmp->password);
		iks_insert_attrib(candidate, "preference", preference);
		if (tmp->protocol == AJI_PROTOCOL_UDP)
			iks_insert_attrib(candidate, "protocol", "udp");
		if (tmp->protocol == AJI_PROTOCOL_SSLTCP)
			iks_insert_attrib(candidate, "protocol", "ssltcp");
		if (tmp->type == AJI_CONNECT_STUN)
			iks_insert_attrib(candidate, "type", "stun");
		if (tmp->type == AJI_CONNECT_LOCAL)
			iks_insert_attrib(candidate, "type", "local");
		if (tmp->type == AJI_CONNECT_RELAY)
			iks_insert_attrib(candidate, "type", "relay");
		iks_insert_attrib(candidate, "network", "0");
		iks_insert_attrib(candidate, "generation", "0");
		ast_aji_send(c, iq);
	}
	p->laststun = 0;

safeout:
	if (ours1)
		ast_free(ours1);
	if (ours2)
		ast_free(ours2);
	iks_delete(iq);
	iks_delete(gtalk);
	iks_delete(candidate);
	iks_delete(transport);

	return 1;
}

static void gtalk_set_owner(struct gtalk_pvt *p, struct ast_channel *chan)
{
	p->owner = chan;
	if (p->rtp) {
		ast_rtp_instance_set_channel_id(p->rtp, chan ? ast_channel_uniqueid(chan) : "");
	}
	if (p->vrtp) {
		ast_rtp_instance_set_channel_id(p->vrtp, chan ? ast_channel_uniqueid(chan) : "");
	}
}

static struct gtalk_pvt *gtalk_alloc(struct gtalk *client, const char *us, const char *them, const char *sid)
{
	struct gtalk_pvt *tmp = NULL;
	struct aji_resource *resources = NULL;
	struct aji_buddy *buddy = NULL;
	char idroster[200] = "";
	char *data, *exten = NULL;
	struct ast_sockaddr bindaddr_tmp;

	ast_debug(1, "The client is %s for alloc\n", client->name);
	if (!sid && !strchr(them, '/')) {	/* I started call! */
		if (!strcasecmp(client->name, "guest")) {
			buddy = ASTOBJ_CONTAINER_FIND(&client->connection->buddies, them);
			if (buddy) {
				resources = buddy->resources;
			}
		} else if (client->buddy) {
			resources = client->buddy->resources;
		}

		while (resources) {
			if (resources->cap->jingle) {
				break;
			}
			resources = resources->next;
		}
		if (resources) {
			snprintf(idroster, sizeof(idroster), "%s/%s", them, resources->resource);
		} else if ((*them == '+') || (strstr(them, "@voice.google.com"))) {
			snprintf(idroster, sizeof(idroster), "%s", them);
		} else {
			ast_log(LOG_ERROR, "no gtalk capable clients to talk to.\n");
			if (buddy) {
				ASTOBJ_UNREF(buddy, ast_aji_buddy_destroy);
			}
			return NULL;
		}
		if (buddy) {
			ASTOBJ_UNREF(buddy, ast_aji_buddy_destroy);
		}
	}
	if (!(tmp = ast_calloc(1, sizeof(*tmp)))) {
		return NULL;
	}
	tmp->cap = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_NOLOCK);
	tmp->jointcap = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_NOLOCK);
	tmp->peercap = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_NOLOCK);
	if (!tmp->jointcap || !tmp->peercap || !tmp->cap) {
		tmp->cap = ast_format_cap_destroy(tmp->cap);
		tmp->jointcap = ast_format_cap_destroy(tmp->jointcap);
		tmp->peercap = ast_format_cap_destroy(tmp->peercap);
		ast_free(tmp);
		return NULL;
	}

	memcpy(&tmp->prefs, &client->prefs, sizeof(struct ast_codec_pref));

	if (sid) {
		ast_copy_string(tmp->sid, sid, sizeof(tmp->sid));
		ast_copy_string(tmp->them, them, sizeof(tmp->them));
		ast_copy_string(tmp->us, us, sizeof(tmp->us));
	} else {
		snprintf(tmp->sid, sizeof(tmp->sid), "%08lx%08lx", ast_random(), ast_random());
		ast_copy_string(tmp->them, idroster, sizeof(tmp->them));
		ast_copy_string(tmp->us, us, sizeof(tmp->us));
		tmp->initiator = 1;
	}
	/* clear codecs */
	bindaddr.sin_family = AF_INET;
	ast_sockaddr_from_sin(&bindaddr_tmp, &bindaddr);
	if (!(tmp->rtp = ast_rtp_instance_new("asterisk", sched, &bindaddr_tmp, NULL))) {
	  ast_log(LOG_ERROR, "Failed to create a new RTP instance (possibly an invalid bindaddr?)\n");
	  ast_free(tmp);
	  return NULL;
	}
	ast_rtp_instance_set_prop(tmp->rtp, AST_RTP_PROPERTY_RTCP, 1);
	ast_rtp_instance_set_prop(tmp->rtp, AST_RTP_PROPERTY_STUN, 1);
	ast_rtp_instance_set_prop(tmp->rtp, AST_RTP_PROPERTY_DTMF, 1);
	ast_rtp_instance_dtmf_mode_set(tmp->rtp, AST_RTP_DTMF_MODE_RFC2833);
	ast_rtp_codecs_payloads_clear(ast_rtp_instance_get_codecs(tmp->rtp), tmp->rtp);

	/* add user configured codec capabilites */
	if (!(ast_format_cap_is_empty(client->cap))) {
		ast_format_cap_copy(tmp->cap, client->cap);
	} else if (!(ast_format_cap_is_empty(global_capability))) {
		ast_format_cap_copy(tmp->cap, global_capability);
	}

	tmp->parent = client;
	if (!tmp->rtp) {
		ast_log(LOG_WARNING, "Out of RTP sessions?\n");
		ast_free(tmp);
		return NULL;
	}

	/* Set CALLERID(name) to the full JID of the remote peer */
	ast_copy_string(tmp->cid_name, tmp->them, sizeof(tmp->cid_name));

	if(strchr(tmp->us, '/')) {
		data = ast_strdupa(tmp->us);
		exten = strsep(&data, "/");
	} else {
		exten = tmp->us;
	}
	ast_copy_string(tmp->exten,  exten, sizeof(tmp->exten));
	ast_mutex_init(&tmp->lock);
	ast_mutex_lock(&gtalklock);
	tmp->next = client->p;
	client->p = tmp;
	ast_mutex_unlock(&gtalklock);
	return tmp;
}

/*! \brief Start new gtalk channel */
static struct ast_channel *gtalk_new(struct gtalk *client, struct gtalk_pvt *i, int state, const char *title, const char *linkedid)
{
	struct ast_channel *tmp;
	const char *n2;
	struct ast_format_cap *what; /* used as SHALLOW COPY DO NOT DESTROY */
	struct ast_format tmpfmt;

	if (title)
		n2 = title;
	else
		n2 = i->us;
	tmp = ast_channel_alloc(1, state, i->cid_num, i->cid_name, linkedid, client->accountcode, i->exten, client->context, client->amaflags, "Gtalk/%s-%04lx", n2, ast_random() & 0xffff);
	if (!tmp) {
		ast_log(LOG_WARNING, "Unable to allocate Gtalk channel structure!\n");
		return NULL;
	}

	ast_channel_stage_snapshot(tmp);

	ast_channel_tech_set(tmp, &gtalk_tech);

	/* Select our native format based on codec preference until we receive
	   something from another device to the contrary. */
	if (!(ast_format_cap_is_empty(i->jointcap))) {
		what = i->jointcap;
	} else if (i->cap) {
		what = i->cap;
	} else {
		what = global_capability;
	}

	/* Set Frame packetization */
	if (i->rtp) {
		ast_rtp_codecs_packetization_set(ast_rtp_instance_get_codecs(i->rtp), i->rtp, &i->prefs);
	}

	ast_codec_choose(&i->prefs, what, 1, &tmpfmt);
	ast_format_cap_add(ast_channel_nativeformats(tmp), &tmpfmt);

	ast_format_cap_iter_start(i->jointcap);
	while (!(ast_format_cap_iter_next(i->jointcap, &tmpfmt))) {
		if (AST_FORMAT_GET_TYPE(tmpfmt.id) == AST_FORMAT_TYPE_VIDEO) {
			ast_format_cap_add(ast_channel_nativeformats(tmp), &tmpfmt);
		}
	}
	ast_format_cap_iter_end(i->jointcap);

	if (i->rtp) {
		ast_channel_set_fd(tmp, 0, ast_rtp_instance_fd(i->rtp, 0));
		ast_channel_set_fd(tmp, 1, ast_rtp_instance_fd(i->rtp, 1));
	}
	if (i->vrtp) {
		ast_channel_set_fd(tmp, 2, ast_rtp_instance_fd(i->vrtp, 0));
		ast_channel_set_fd(tmp, 3, ast_rtp_instance_fd(i->vrtp, 1));
	}
	if (state == AST_STATE_RING)
		ast_channel_rings_set(tmp, 1);
	ast_channel_adsicpe_set(tmp, AST_ADSI_UNAVAILABLE);

	ast_best_codec(ast_channel_nativeformats(tmp), &tmpfmt);
	ast_format_copy(ast_channel_writeformat(tmp), &tmpfmt);
	ast_format_copy(ast_channel_rawwriteformat(tmp), &tmpfmt);
	ast_format_copy(ast_channel_readformat(tmp), &tmpfmt);
	ast_format_copy(ast_channel_rawreadformat(tmp), &tmpfmt);
	ast_channel_tech_pvt_set(tmp, i);

	ast_channel_callgroup_set(tmp, client->callgroup);
	ast_channel_pickupgroup_set(tmp, client->pickupgroup);
	ast_channel_caller(tmp)->id.name.presentation = client->callingpres;
	ast_channel_caller(tmp)->id.number.presentation = client->callingpres;
	if (!ast_strlen_zero(client->accountcode))
		ast_channel_accountcode_set(tmp, client->accountcode);
	if (client->amaflags)
		ast_channel_amaflags_set(tmp, client->amaflags);
	if (!ast_strlen_zero(client->language))
		ast_channel_language_set(tmp, client->language);
	if (!ast_strlen_zero(client->musicclass))
		ast_channel_musicclass_set(tmp, client->musicclass);
	if (!ast_strlen_zero(client->parkinglot))
		ast_channel_parkinglot_set(tmp, client->parkinglot);
	gtalk_set_owner(i, tmp);
	ast_module_ref(ast_module_info->self);
	ast_channel_context_set(tmp, client->context);
	ast_channel_exten_set(tmp, i->exten);

	if (!ast_strlen_zero(i->exten) && strcmp(i->exten, "s")) {
		ast_channel_dialed(tmp)->number.str = ast_strdup(i->exten);
	}
	ast_channel_priority_set(tmp, 1);
	if (i->rtp)
		ast_jb_configure(tmp, &global_jbconf);

	ast_channel_stage_snapshot_done(tmp);
	ast_channel_unlock(tmp);

	if (state != AST_STATE_DOWN && ast_pbx_start(tmp)) {
		ast_log(LOG_WARNING, "Unable to start PBX on %s\n", ast_channel_name(tmp));
		ast_channel_hangupcause_set(tmp, AST_CAUSE_SWITCH_CONGESTION);
		ast_hangup(tmp);
		tmp = NULL;
	}
	return tmp;
}

static int gtalk_action(struct gtalk *client, struct gtalk_pvt *p, const char *action)
{
	iks *request, *session = NULL;
	int res = -1;
	char *lowerthem = NULL;

	request = iks_new("iq");
	if (request) {
		iks_insert_attrib(request, "type", "set");
		iks_insert_attrib(request, "from", p->us);
		iks_insert_attrib(request, "to", p->them);
		iks_insert_attrib(request, "id", client->connection->mid);
		ast_aji_increment_mid(client->connection->mid);
		session = iks_new("session");
		if (session) {
			iks_insert_attrib(session, "type", action);
			iks_insert_attrib(session, "id", p->sid);
			/* put the initiator attribute to lower case if we receive the call
			 * otherwise GoogleTalk won't establish the session */
			if (!p->initiator) {
			        char c;
				char *t = lowerthem = ast_strdupa(p->them);
				while (((c = *t) != '/') && (*t++ = tolower(c)));
			}
			iks_insert_attrib(session, "initiator", p->initiator ? p->us : lowerthem);
			iks_insert_attrib(session, "xmlns", GOOGLE_NS);
			iks_insert_node(request, session);
			ast_aji_send(client->connection, request);
			res = 0;
		}
	}

	iks_delete(session);
	iks_delete(request);

	return res;
}

static void gtalk_free_candidates(struct gtalk_candidate *candidate)
{
	struct gtalk_candidate *last;
	while (candidate) {
		last = candidate;
		candidate = candidate->next;
		ast_free(last);
	}
}

static void gtalk_free_pvt(struct gtalk *client, struct gtalk_pvt *p)
{
	struct gtalk_pvt *cur, *prev = NULL;
	cur = client->p;
	while (cur) {
		if (cur == p) {
			if (prev)
				prev->next = p->next;
			else
				client->p = p->next;
			break;
		}
		prev = cur;
		cur = cur->next;
	}
	if (p->ringrule)
		iks_filter_remove_rule(p->parent->connection->f, p->ringrule);
	if (p->owner)
		ast_log(LOG_WARNING, "Uh oh, there's an owner, this is going to be messy.\n");
	if (p->rtp)
		ast_rtp_instance_destroy(p->rtp);
	if (p->vrtp)
		ast_rtp_instance_destroy(p->vrtp);
	gtalk_free_candidates(p->theircandidates);
	p->cap = ast_format_cap_destroy(p->cap);
	p->jointcap = ast_format_cap_destroy(p->jointcap);
	p->peercap = ast_format_cap_destroy(p->peercap);
	ast_free(p);
}


static int gtalk_newcall(struct gtalk *client, ikspak *pak)
{
	struct gtalk_pvt *p, *tmp = client->p;
	struct ast_channel *chan;
	int res;
	iks *codec;
	char *from = NULL;
	char s1[BUFSIZ], s2[BUFSIZ], s3[BUFSIZ];
	int peernoncodeccapability;
	char *sid;

	/* Make sure our new call doesn't exist yet */
	from = iks_find_attrib(pak->x,"to");
	if (!from) {
		from = client->connection->jid->full;
	}

	while (tmp) {
		if (iks_find_with_attrib(pak->x, "session", "id", tmp->sid) ||
			(iks_find_attrib(pak->query, "id") && !strcmp(iks_find_attrib(pak->query, "id"), tmp->sid))) {
			ast_log(LOG_NOTICE, "Ignoring duplicate call setup on SID %s\n", tmp->sid);
			gtalk_response(client, from, pak, "out-of-order", NULL);
			return -1;
		}
		tmp = tmp->next;
	}

	if (!strcasecmp(client->name, "guest")){
		/* the guest account is not tied to any configured XMPP client,
		   let's set it now */
		if (client->connection) {
			ASTOBJ_UNREF(client->connection, ast_aji_client_destroy);
		}
		client->connection = ast_aji_get_client(from);
		if (!client->connection) {
			ast_log(LOG_ERROR, "No XMPP client to talk to, us (partial JID) : %s\n", from);
			return -1;
		}
	}

	if (!(sid = iks_find_attrib(pak->query, "id"))) {
		ast_log(LOG_WARNING, "Received Initiate without id attribute. Can not start call.\n");
		return -1;
	}

	p = gtalk_alloc(client, from, pak->from->full, sid);
	if (!p) {
		ast_log(LOG_WARNING, "Unable to allocate gtalk structure!\n");
		return -1;
	}

	chan = gtalk_new(client, p, AST_STATE_DOWN, pak->from->user, NULL);
	if (!chan) {
		gtalk_free_pvt(client, p);
		return -1;
	}

	ast_mutex_lock(&p->lock);
	ast_copy_string(p->them, pak->from->full, sizeof(p->them));
	ast_copy_string(p->sid, sid, sizeof(p->sid));

	/* codec points to the first <payload-type/> tag */
	codec = iks_first_tag(iks_first_tag(pak->query));

	while (codec) {
		char *codec_id = iks_find_attrib(codec, "id");
		char *codec_name = iks_find_attrib(codec, "name");
		if (!codec_id || !codec_name) {
			codec = iks_next_tag(codec);
			continue;
		}
		if (!strcmp(S_OR(iks_name(codec), ""), "vid:payload-type") && p->vrtp) {
			ast_rtp_codecs_payloads_set_m_type(
				ast_rtp_instance_get_codecs(p->vrtp),
				p->vrtp,
				atoi(codec_id));
			ast_rtp_codecs_payloads_set_rtpmap_type(
				ast_rtp_instance_get_codecs(p->vrtp),
				p->vrtp,
				atoi(codec_id),
				"video",
				codec_name,
				0);
		} else {
			ast_rtp_codecs_payloads_set_m_type(
				ast_rtp_instance_get_codecs(p->rtp),
				p->rtp,
				atoi(codec_id));
			ast_rtp_codecs_payloads_set_rtpmap_type(
				ast_rtp_instance_get_codecs(p->rtp),
				p->rtp,
				atoi(codec_id),
				"audio",
				codec_name,
				0);
		}
		codec = iks_next_tag(codec);
	}

	/* Now gather all of the codecs that we are asked for */
	ast_rtp_codecs_payload_formats(ast_rtp_instance_get_codecs(p->rtp), p->peercap, &peernoncodeccapability);
	ast_format_cap_joint_copy(p->cap, p->peercap, p->jointcap);
	ast_mutex_unlock(&p->lock);

	ast_channel_lock(chan);
	ast_setstate(chan, AST_STATE_RING);
	ast_channel_unlock(chan);
	if (ast_format_cap_is_empty(p->jointcap)) {
		ast_log(LOG_WARNING, "Capabilities don't match : us - %s, peer - %s, combined - %s \n", ast_getformatname_multiple(s1, BUFSIZ, p->cap),
			ast_getformatname_multiple(s2, BUFSIZ, p->peercap),
			ast_getformatname_multiple(s3, BUFSIZ, p->jointcap));
		/* close session if capabilities don't match */
		gtalk_action(client, p, "reject");
		p->alreadygone = 1;
		gtalk_hangup(chan);
		ast_channel_release(chan);
		return -1;
	}

	res = ast_pbx_start(chan);

	switch (res) {
	case AST_PBX_FAILED:
		ast_log(LOG_WARNING, "Failed to start PBX :(\n");
		gtalk_response(client, from, pak, "service-unavailable", NULL);
		break;
	case AST_PBX_CALL_LIMIT:
		ast_log(LOG_WARNING, "Failed to start PBX (call limit reached) \n");
		gtalk_response(client, from, pak, "service-unavailable", NULL);
		break;
	case AST_PBX_SUCCESS:
		gtalk_response(client, from, pak, NULL, NULL);
		gtalk_create_candidates(client, p, p->sid, p->them, p->us);
		/* nothing to do */
		break;
	}

	return 1;
}

static int gtalk_update_externip(void)
{
	int sock;
	char *newaddr;
	struct sockaddr_in answer = { 0, };
	struct sockaddr_in *dst;
	struct ast_sockaddr tmp_dst;

	if (!stunaddr.sin_addr.s_addr) {
		return -1;
	}
	dst = &stunaddr;

	sock = socket(AF_INET, SOCK_DGRAM, 0);
	if (sock < 0) {
		ast_log(LOG_WARNING, "Unable to create STUN socket: %s\n", strerror(errno));
		return -1;
	}

	ast_sockaddr_from_sin(&tmp_dst, dst);
	if (ast_connect(sock, &tmp_dst) != 0) {
		ast_log(LOG_WARNING, "STUN Failed to connect to %s\n", ast_sockaddr_stringify(&tmp_dst));
		close(sock);
		return -1;
	}

	if ((ast_stun_request(sock, &stunaddr, NULL, &answer))) {
		close(sock);
		return -1;
	}

	newaddr = ast_strdupa(ast_inet_ntoa(answer.sin_addr));
	memcpy(externip, newaddr, sizeof(externip));

	close(sock);
	return 0;

}

static int gtalk_update_stun(struct gtalk *client, struct gtalk_pvt *p)
{
	struct gtalk_candidate *tmp;
	struct hostent *hp;
	struct ast_hostent ahp;
	struct sockaddr_in sin = { 0, };
	struct sockaddr_in aux = { 0, };
	struct ast_sockaddr sin_tmp;
	struct ast_sockaddr aux_tmp;

	if (time(NULL) == p->laststun)
		return 0;

	tmp = p->theircandidates;
	p->laststun = time(NULL);
	while (tmp) {
		char username[256];

		/* Find the IP address of the host */
		if (!(hp = ast_gethostbyname(tmp->ip, &ahp))) {
			ast_log(LOG_WARNING, "Could not get host by name for %s\n", tmp->ip);
			tmp = tmp->next;
			continue;
		}
		sin.sin_family = AF_INET;
		memcpy(&sin.sin_addr, hp->h_addr, sizeof(sin.sin_addr));
		sin.sin_port = htons(tmp->port);
		snprintf(username, sizeof(username), "%s%s", tmp->username, p->ourcandidates->username);

		/* Find out the result of the STUN */
		ast_rtp_instance_get_remote_address(p->rtp, &aux_tmp);
		ast_sockaddr_to_sin(&aux_tmp, &aux);

		/* If the STUN result is different from the IP of the hostname,
		 * lock on the stun IP of the hostname advertised by the
		 * remote client */
		if (aux.sin_addr.s_addr && (aux.sin_addr.s_addr != sin.sin_addr.s_addr)) {
			ast_rtp_instance_stun_request(p->rtp, &aux_tmp, username);
		} else {
			ast_sockaddr_from_sin(&sin_tmp, &sin);
			ast_rtp_instance_stun_request(p->rtp, &sin_tmp, username);
		}
		if (aux.sin_addr.s_addr) {
			ast_debug(4, "Receiving RTP traffic from IP %s, matches with remote candidate's IP %s\n", ast_inet_ntoa(aux.sin_addr), tmp->ip);
			ast_debug(4, "Sending STUN request to %s\n", tmp->ip);
		}

		tmp = tmp->next;
	}
	return 1;
}

static int gtalk_add_candidate(struct gtalk *client, ikspak *pak)
{
	struct gtalk_pvt *p = NULL, *tmp = NULL;
	struct aji_client *c = client->connection;
	struct gtalk_candidate *newcandidate = NULL;
	iks *traversenodes = NULL, *receipt = NULL;
	char *from;

	from = iks_find_attrib(pak->x,"to");
	if (!from) {
		from = c->jid->full;
	}

	for (tmp = client->p; tmp; tmp = tmp->next) {
		if (iks_find_with_attrib(pak->x, "session", "id", tmp->sid) ||
			(iks_find_attrib(pak->query, "id") && !strcmp(iks_find_attrib(pak->query, "id"), tmp->sid))) {
			p = tmp;
			break;
		}
	}

	if (!p) {
		return -1;
	}
	traversenodes = pak->query;
	while(traversenodes) {
		if(!strcasecmp(S_OR(iks_name(traversenodes), ""), "session")) {
			traversenodes = iks_first_tag(traversenodes);
			continue;
		}
		if(!strcasecmp(S_OR(iks_name(traversenodes), ""), "ses:session")) {
			traversenodes = iks_child(traversenodes);
			continue;
		}
		if(!strcasecmp(S_OR(iks_name(traversenodes), ""), "candidate") || !strcasecmp(S_OR(iks_name(traversenodes), ""), "ses:candidate")) {
			newcandidate = ast_calloc(1, sizeof(*newcandidate));
			if (!newcandidate)
				return 0;
			ast_copy_string(newcandidate->name,
				S_OR(iks_find_attrib(traversenodes, "name"), ""),
				sizeof(newcandidate->name));
			ast_copy_string(newcandidate->ip,
				S_OR(iks_find_attrib(traversenodes, "address"), ""),
				sizeof(newcandidate->ip));
			newcandidate->port = atoi(iks_find_attrib(traversenodes, "port"));
			ast_copy_string(newcandidate->username,
				S_OR(iks_find_attrib(traversenodes, "username"), ""),
				sizeof(newcandidate->username));
			ast_copy_string(newcandidate->password,
				S_OR(iks_find_attrib(traversenodes, "password"), ""),
				sizeof(newcandidate->password));
			newcandidate->preference = atof(iks_find_attrib(traversenodes, "preference"));
			if (!strcasecmp(S_OR(iks_find_attrib(traversenodes, "protocol"), ""), "udp"))
				newcandidate->protocol = AJI_PROTOCOL_UDP;
			if (!strcasecmp(S_OR(iks_find_attrib(traversenodes, "protocol"), ""), "ssltcp"))
				newcandidate->protocol = AJI_PROTOCOL_SSLTCP;

			if (!strcasecmp(S_OR(iks_find_attrib(traversenodes, "type"), ""), "stun"))
				newcandidate->type = AJI_CONNECT_STUN;
			if (!strcasecmp(S_OR(iks_find_attrib(traversenodes, "type"), ""), "local"))
				newcandidate->type = AJI_CONNECT_LOCAL;
			if (!strcasecmp(S_OR(iks_find_attrib(traversenodes, "type"), ""), "relay"))
				newcandidate->type = AJI_CONNECT_RELAY;
			ast_copy_string(newcandidate->network,
				S_OR(iks_find_attrib(traversenodes, "network"), ""),
				sizeof(newcandidate->network));
			newcandidate->generation = atoi(S_OR(iks_find_attrib(traversenodes, "generation"), "0"));
			newcandidate->next = NULL;

			newcandidate->next = p->theircandidates;
			p->theircandidates = newcandidate;
			p->laststun = 0;
			gtalk_update_stun(p->parent, p);
			newcandidate = NULL;
		}
		traversenodes = iks_next_tag(traversenodes);
	}

	receipt = iks_new("iq");
	iks_insert_attrib(receipt, "type", "result");
	iks_insert_attrib(receipt, "from", from);
	iks_insert_attrib(receipt, "to", S_OR(iks_find_attrib(pak->x, "from"), ""));
	iks_insert_attrib(receipt, "id", S_OR(iks_find_attrib(pak->x, "id"), ""));
	ast_aji_send(c, receipt);

	iks_delete(receipt);

	return 1;
}

static struct ast_frame *gtalk_rtp_read(struct ast_channel *ast, struct gtalk_pvt *p)
{
	struct ast_frame *f;

	if (!p->rtp) {
		return &ast_null_frame;
	}
	f = ast_rtp_instance_read(p->rtp, 0);
	gtalk_update_stun(p->parent, p);
	if (p->owner) {
		/* We already hold the channel lock */
		if (f->frametype == AST_FRAME_VOICE) {
			if (!ast_format_cap_iscompatible(ast_channel_nativeformats(p->owner), &f->subclass.format)) {
				ast_debug(1, "Oooh, format changed to %s\n", ast_getformatname(&f->subclass.format));
				ast_format_cap_remove_bytype(ast_channel_nativeformats(p->owner), AST_FORMAT_TYPE_AUDIO);
				ast_format_cap_add(ast_channel_nativeformats(p->owner), &f->subclass.format);
				ast_set_read_format(p->owner, ast_channel_readformat(p->owner));
				ast_set_write_format(p->owner, ast_channel_writeformat(p->owner));
			}
			/* if ((ast_test_flag(p, SIP_DTMF) == SIP_DTMF_INBAND) && p->vad) {
				f = ast_dsp_process(p->owner, p->vad, f);
				if (option_debug && f && (f->frametype == AST_FRAME_DTMF))
					ast_debug(1, "* Detected inband DTMF '%c'\n", f->subclass);
	        } */
		}
	}
	return f;
}

static struct ast_frame *gtalk_read(struct ast_channel *ast)
{
	struct ast_frame *fr;
	struct gtalk_pvt *p = ast_channel_tech_pvt(ast);

	ast_mutex_lock(&p->lock);
	fr = gtalk_rtp_read(ast, p);
	ast_mutex_unlock(&p->lock);
	return fr;
}

/*! \brief Send frame to media channel (rtp) */
static int gtalk_write(struct ast_channel *ast, struct ast_frame *frame)
{
	struct gtalk_pvt *p = ast_channel_tech_pvt(ast);
	int res = 0;
	char buf[256];

	switch (frame->frametype) {
	case AST_FRAME_VOICE:
		if (!(ast_format_cap_iscompatible(ast_channel_nativeformats(ast), &frame->subclass.format))) {
			ast_log(LOG_WARNING,
					"Asked to transmit frame type %s, while native formats is %s (read/write = %s/%s)\n",
					ast_getformatname(&frame->subclass.format),
					ast_getformatname_multiple(buf, sizeof(buf), ast_channel_nativeformats(ast)),
					ast_getformatname(ast_channel_readformat(ast)),
					ast_getformatname(ast_channel_writeformat(ast)));
			return 0;
		}
		if (p) {
			ast_mutex_lock(&p->lock);
			if (p->rtp) {
				res = ast_rtp_instance_write(p->rtp, frame);
			}
			ast_mutex_unlock(&p->lock);
		}
		break;
	case AST_FRAME_VIDEO:
		if (p) {
			ast_mutex_lock(&p->lock);
			if (p->vrtp) {
				res = ast_rtp_instance_write(p->vrtp, frame);
			}
			ast_mutex_unlock(&p->lock);
		}
		break;
	case AST_FRAME_IMAGE:
		return 0;
		break;
	default:
		ast_log(LOG_WARNING, "Can't send %d type frames with Gtalk write\n",
				frame->frametype);
		return 0;
	}

	return res;
}

static int gtalk_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
{
	struct gtalk_pvt *p = ast_channel_tech_pvt(newchan);
	ast_mutex_lock(&p->lock);

	if ((p->owner != oldchan)) {
		ast_mutex_unlock(&p->lock);
		return -1;
	}
	if (p->owner == oldchan) {
		gtalk_set_owner(p, newchan);
	}
	ast_mutex_unlock(&p->lock);
	return 0;
}

static int gtalk_indicate(struct ast_channel *ast, int condition, const void *data, size_t datalen)
{
	int res = 0;

	switch (condition) {
	case AST_CONTROL_HOLD:
		ast_moh_start(ast, data, NULL);
		break;
	case AST_CONTROL_UNHOLD:
		ast_moh_stop(ast);
		break;
	default:
		ast_debug(3, "Don't know how to indicate condition '%d'\n", condition);
		/* fallthrough */
	case AST_CONTROL_PVT_CAUSE_CODE:
		res = -1;
	}

	return res;
}

static int gtalk_sendtext(struct ast_channel *chan, const char *text)
{
	int res = 0;
	struct aji_client *client = NULL;
	struct gtalk_pvt *p = ast_channel_tech_pvt(chan);

	if (!p->parent) {
		ast_log(LOG_ERROR, "Parent channel not found\n");
		return -1;
	}
	if (!p->parent->connection) {
		ast_log(LOG_ERROR, "XMPP client not found\n");
		return -1;
	}
	client = p->parent->connection;
	res = ast_aji_send_chat(client, p->them, text);
	return res;
}

static int gtalk_digit_begin(struct ast_channel *chan, char digit)
{
	struct gtalk_pvt *p = ast_channel_tech_pvt(chan);
	int res = 0;

	ast_mutex_lock(&p->lock);
	if (p->rtp) {
		ast_rtp_instance_dtmf_begin(p->rtp, digit);
	} else {
		res = -1;
	}
	ast_mutex_unlock(&p->lock);

	return res;
}

static int gtalk_digit_end(struct ast_channel *chan, char digit, unsigned int duration)
{
	struct gtalk_pvt *p = ast_channel_tech_pvt(chan);
	int res = 0;

	ast_mutex_lock(&p->lock);
	if (p->rtp) {
		ast_rtp_instance_dtmf_end_with_duration(p->rtp, digit, duration);
	} else {
		res = -1;
	}
	ast_mutex_unlock(&p->lock);

	return res;
}

/* This function is of not in use at the moment, but I am choosing to leave this
 * within the code base as a reference to how DTMF is possible through
 * jingle signaling.  However, google currently does DTMF through the RTP. */
#if 0
static int gtalk_digit(struct ast_channel *ast, char digit, unsigned int duration)
{
	struct gtalk_pvt *p = ast->tech_pvt;
	struct gtalk *client = p->parent;
	iks *iq, *gtalk, *dtmf;
	char buffer[2] = {digit, '\0'};
	char *lowerthem = NULL;
	iq = iks_new("iq");
	gtalk = iks_new("gtalk");
	dtmf = iks_new("dtmf");
	if(!iq || !gtalk || !dtmf) {
		iks_delete(iq);
		iks_delete(gtalk);
		iks_delete(dtmf);
		ast_log(LOG_ERROR, "Did not send dtmf do to memory issue\n");
		return -1;
	}

	iks_insert_attrib(iq, "type", "set");
	iks_insert_attrib(iq, "to", p->them);
	iks_insert_attrib(iq, "from", p->us);
	iks_insert_attrib(iq, "id", client->connection->mid);
	ast_aji_increment_mid(client->connection->mid);
	iks_insert_attrib(gtalk, "xmlns", "http://jabber.org/protocol/gtalk");
	iks_insert_attrib(gtalk, "action", "session-info");
	// put the initiator attribute to lower case if we receive the call
	// otherwise GoogleTalk won't establish the session
	if (!p->initiator) {
	        char c;
	        char *t = lowerthem = ast_strdupa(p->them);
	        while (((c = *t) != '/') && (*t++ = tolower(c)));
	}
	iks_insert_attrib(gtalk, "initiator", p->initiator ? p->us: lowerthem);
	iks_insert_attrib(gtalk, "sid", p->sid);
	iks_insert_attrib(dtmf, "xmlns", "http://jabber.org/protocol/gtalk/info/dtmf");
	iks_insert_attrib(dtmf, "code", buffer);
	iks_insert_node(iq, gtalk);
	iks_insert_node(gtalk, dtmf);

	ast_mutex_lock(&p->lock);
	if (ast->dtmff.frametype == AST_FRAME_DTMF_BEGIN || duration == 0) {
		iks_insert_attrib(dtmf, "action", "button-down");
	} else if (ast->dtmff.frametype == AST_FRAME_DTMF_END || duration != 0) {
		iks_insert_attrib(dtmf, "action", "button-up");
	}
	ast_aji_send(client->connection, iq);

	iks_delete(iq);
	iks_delete(gtalk);
	iks_delete(dtmf);
	ast_mutex_unlock(&p->lock);
	return 0;
}
#endif

static int gtalk_sendhtml(struct ast_channel *ast, int subclass, const char *data, int datalen)
{
	ast_log(LOG_NOTICE, "XXX Implement gtalk sendhtml XXX\n");

	return -1;
}

/*!\brief Initiate new call, part of PBX interface
 * dest is the dial string */
static int gtalk_call(struct ast_channel *ast, const char *dest, int timeout)
{
	struct gtalk_pvt *p = ast_channel_tech_pvt(ast);

	if ((ast_channel_state(ast) != AST_STATE_DOWN) && (ast_channel_state(ast) != AST_STATE_RESERVED)) {
		ast_log(LOG_WARNING, "gtalk_call called on %s, neither down nor reserved\n", ast_channel_name(ast));
		return -1;
	}

	ast_setstate(ast, AST_STATE_RING);
	if (!p->ringrule) {
		ast_copy_string(p->ring, p->parent->connection->mid, sizeof(p->ring));
		p->ringrule = iks_filter_add_rule(p->parent->connection->f, gtalk_ringing_ack, p,
							IKS_RULE_ID, p->ring, IKS_RULE_DONE);
	} else {
		ast_log(LOG_WARNING, "Whoa, already have a ring rule!\n");
	}

	gtalk_invite(p, p->them, p->us, p->sid, 1);

	return 0;
}

/*! \brief Hangup a call through the gtalk proxy channel */
static int gtalk_hangup(struct ast_channel *ast)
{
	struct gtalk_pvt *p = ast_channel_tech_pvt(ast);
	struct gtalk *client;

	ast_mutex_lock(&p->lock);
	client = p->parent;
	gtalk_set_owner(p, NULL);
	ast_channel_tech_pvt_set(ast, NULL);
	if (!p->alreadygone) {
		gtalk_action(client, p, "terminate");
	}
	ast_mutex_unlock(&p->lock);

	gtalk_free_pvt(client, p);
	ast_module_unref(ast_module_info->self);

	return 0;
}

/*!\brief Part of PBX interface */
static struct ast_channel *gtalk_request(const char *type, struct ast_format_cap *cap, const struct ast_channel *requestor, const char *data, int *cause)
{
	struct gtalk_pvt *p = NULL;
	struct gtalk *client = NULL;
	char *sender = NULL, *to = NULL, *s = NULL;
	struct ast_channel *chan = NULL;

	if (data) {
		s = ast_strdupa(data);
		sender = strsep(&s, "/");
		if (sender && (sender[0] != '\0')) {
			to = strsep(&s, "/");
		}
		if (!to) {
			ast_log(LOG_ERROR, "Bad arguments in Gtalk Dialstring: %s\n", data);
			return NULL;
		}
		if (!to) {
			ast_log(LOG_ERROR, "Bad arguments in Gtalk Dialstring: %s\n", (char*) data);
			return NULL;
		}
	}

	client = find_gtalk(to, sender);
	if (!client) {
		ast_log(LOG_WARNING, "Could not find recipient.\n");
		return NULL;
	}
	if (!strcasecmp(client->name, "guest")){
		/* the guest account is not tied to any configured XMPP client,
		   let's set it now */
		if (client->connection) {
			ASTOBJ_UNREF(client->connection, ast_aji_client_destroy);
		}
		client->connection = ast_aji_get_client(sender);
		if (!client->connection) {
			ast_log(LOG_ERROR, "No XMPP client to talk to, us (partial JID) : %s\n", sender);
			ASTOBJ_UNREF(client, gtalk_member_destroy);
			return NULL;
		}
	}

	ASTOBJ_WRLOCK(client);
	p = gtalk_alloc(client, strchr(sender, '@') ? sender : client->connection->jid->full, strchr(to, '@') ? to : client->user, NULL);
	if (p) {
		chan = gtalk_new(client, p, AST_STATE_DOWN, to, requestor ? ast_channel_linkedid(requestor) : NULL);
	}
	ASTOBJ_UNLOCK(client);
	return chan;
}

/*! \brief CLI command "gtalk show channels" */
static char *gtalk_show_channels(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
#define FORMAT  "%-30.30s  %-30.30s  %-15.15s  %-5.5s %-5.5s \n"
	struct gtalk_pvt *p;
	struct ast_channel *chan;
	int numchans = 0;
	char them[AJI_MAX_JIDLEN];
	char *jid = NULL;
	char *resource = NULL;

	switch (cmd) {
	case CLI_INIT:
		e->command = "gtalk show channels";
		e->usage =
			"Usage: gtalk show channels\n"
			"       Shows current state of the Gtalk channels.\n";
		return NULL;
	case CLI_GENERATE:
		return NULL;
	}

	if (a->argc != 3)
		return CLI_SHOWUSAGE;

	ast_mutex_lock(&gtalklock);
	ast_cli(a->fd, FORMAT, "Channel", "Jabber ID", "Resource", "Read", "Write");
	ASTOBJ_CONTAINER_TRAVERSE(&gtalk_list, 1, {
		ASTOBJ_WRLOCK(iterator);
		p = iterator->p;
		while(p) {
			chan = p->owner;
			ast_copy_string(them, p->them, sizeof(them));
			jid = them;
			resource = strchr(them, '/');
			if (!resource)
				resource = "None";
			else {
				*resource = '\0';
				resource ++;
			}
			if (chan)
				ast_cli(a->fd, FORMAT,
					ast_channel_name(chan),
					jid,
					resource,
					ast_getformatname(ast_channel_readformat(chan)),
					ast_getformatname(ast_channel_writeformat(chan))
					);
			else
				ast_log(LOG_WARNING, "No available channel\n");
			numchans ++;
			p = p->next;
		}
		ASTOBJ_UNLOCK(iterator);
	});

	ast_mutex_unlock(&gtalklock);

	ast_cli(a->fd, "%d active gtalk channel%s\n", numchans, (numchans != 1) ? "s" : "");
	return CLI_SUCCESS;
#undef FORMAT
}

/*! \brief List global settings for the GoogleTalk channel */
static char *gtalk_show_settings(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
	char codec_buf[BUFSIZ];
	switch (cmd) {
	case CLI_INIT:
		e->command = "gtalk show settings";
		e->usage =
			"Usage: gtalk show settings\n"
			"       Provides detailed list of the configuration on the GoogleTalk channel.\n";
		return NULL;
	case CLI_GENERATE:
		return NULL;
	}

	if (a->argc != 3) {
		return CLI_SHOWUSAGE;
	}

#define FORMAT "  %-25.20s  %-15.30s\n"

	ast_cli(a->fd, "\nGlobal Settings:\n");
	ast_cli(a->fd, "----------------\n");
	ast_cli(a->fd, FORMAT, "UDP Bindaddress:", ast_inet_ntoa(bindaddr.sin_addr));
	ast_cli(a->fd, FORMAT, "Stun Address:", global_stunaddr != 0 ? ast_inet_ntoa(stunaddr.sin_addr) : "Disabled");
	ast_cli(a->fd, FORMAT, "External IP:", S_OR(externip, "Disabled"));
	ast_cli(a->fd, FORMAT, "Context:", global_context);
	ast_cli(a->fd, FORMAT, "Codecs:", ast_getformatname_multiple(codec_buf, sizeof(codec_buf) - 1, global_capability));
	ast_cli(a->fd, FORMAT, "Parking Lot:", global_parkinglot);
	ast_cli(a->fd, FORMAT, "Allow Guest:", AST_CLI_YESNO(global_allowguest));
	ast_cli(a->fd, "\n----\n");

	return CLI_SUCCESS;
#undef FORMAT
}

/*! \brief CLI command "gtalk reload"
 *  \todo XXX TODO make this work. */
#if 0
static char *gtalk_do_reload(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
	switch (cmd) {
	case CLI_INIT:
		e->command = "gtalk reload";
		e->usage =
			"Usage: gtalk reload\n"
			"       Reload gtalk channel driver.\n";
		return NULL;
	case CLI_GENERATE:
		return NULL;
	}

	ast_verbose("IT DOES WORK!\n");
	return CLI_SUCCESS;
}
#endif

static int gtalk_parser(void *data, ikspak *pak)
{
	struct gtalk *client = ASTOBJ_REF((struct gtalk *) data);
	int res;
	iks *tmp;

	if (!strcasecmp(iks_name(pak->query), "jin:jingle") && (tmp = iks_next(pak->query)) && !strcasecmp(iks_name(tmp), "ses:session")) {
		ast_debug(1, "New method detected. Skipping jingle offer and using old gtalk method.\n");
		pak->query = tmp;
	}

	if (!strcmp(S_OR(iks_find_attrib(pak->x, "type"), ""), "error")) {
		ast_log(LOG_NOTICE, "Remote peer reported an error, trying to establish the call anyway\n");
	}

	if (ast_strlen_zero(iks_find_attrib(pak->query, "type"))) {
		ast_log(LOG_NOTICE, "No attribute \"type\" found.  Ignoring message.\n");
	} else if (!strcmp(iks_find_attrib(pak->query, "type"), "initiate")) {
		/* New call */
		gtalk_newcall(client, pak);
	} else if (!strcmp(iks_find_attrib(pak->query, "type"), "candidates") || !strcmp(iks_find_attrib(pak->query, "type"), "transport-info")) {
		ast_debug(3, "About to add candidate!\n");
		res = gtalk_add_candidate(client, pak);
		if (!res) {
			ast_log(LOG_WARNING, "Could not add any candidate\n");
		} else {
			ast_debug(3, "Candidate Added!\n");
		}
	} else if (!strcmp(iks_find_attrib(pak->query, "type"), "accept")) {
		gtalk_is_answered(client, pak);
	} else if (!strcmp(iks_find_attrib(pak->query, "type"), "transport-accept")) {
		gtalk_is_accepted(client, pak);
	} else if (!strcmp(iks_find_attrib(pak->query, "type"), "content-info") || iks_find_with_attrib(pak->x, "gtalk", "action", "session-info")) {
		gtalk_handle_dtmf(client, pak);
	} else if (!strcmp(iks_find_attrib(pak->query, "type"), "terminate")) {
		gtalk_hangup_farend(client, pak);
	} else if (!strcmp(iks_find_attrib(pak->query, "type"), "reject")) {
		gtalk_hangup_farend(client, pak);
	}
	ASTOBJ_UNREF(client, gtalk_member_destroy);
	return IKS_FILTER_EAT;
}

static int gtalk_create_member(char *label, struct ast_variable *var, int allowguest,
								struct ast_codec_pref prefs, char *context,
								struct gtalk *member)
{
	struct aji_client *client;

	if (!member)
		ast_log(LOG_WARNING, "Out of memory.\n");

	ast_copy_string(member->name, label, sizeof(member->name));
	ast_copy_string(member->user, label, sizeof(member->user));
	ast_copy_string(member->context, context, sizeof(member->context));
	member->allowguest = allowguest;
	member->prefs = prefs;
	while (var) {
		if (!strcasecmp(var->name, "username"))
			ast_copy_string(member->user, var->value, sizeof(member->user));
		else if (!strcasecmp(var->name, "disallow"))
			ast_parse_allow_disallow(&member->prefs, member->cap, var->value, 0);
		else if (!strcasecmp(var->name, "allow"))
			ast_parse_allow_disallow(&member->prefs, member->cap, var->value, 1);
		else if (!strcasecmp(var->name, "context"))
			ast_copy_string(member->context, var->value, sizeof(member->context));
		else if (!strcasecmp(var->name, "parkinglot"))
			ast_copy_string(member->parkinglot, var->value, sizeof(member->parkinglot));
		else if (!strcasecmp(var->name, "connection")) {
			if ((client = ast_aji_get_client(var->value))) {
				member->connection = client;
				iks_filter_add_rule(client->f, gtalk_parser, member,
						    IKS_RULE_TYPE, IKS_PAK_IQ,
						    IKS_RULE_FROM_PARTIAL, member->user,
						    IKS_RULE_NS, GOOGLE_NS,
						    IKS_RULE_DONE);
			} else {
				ast_log(LOG_ERROR, "connection referenced not found!\n");
				return 0;
			}
		}
		var = var->next;
	}
	if (member->connection && member->user)
		member->buddy = ASTOBJ_CONTAINER_FIND(&member->connection->buddies, member->user);
	else {
		ast_log(LOG_ERROR, "No Connection or Username!\n");
	}
	return 1;
}

static int gtalk_load_config(void)
{
	char *cat = NULL;
	struct ast_config *cfg = NULL;
	struct ast_variable *var;
	struct gtalk *member;
	struct ast_codec_pref prefs;
	struct aji_client_container *clients;
	struct gtalk_candidate *global_candidates = NULL;
	struct hostent *hp;
	struct ast_hostent ahp;
	struct ast_flags config_flags = { 0 };

	cfg = ast_config_load(GOOGLE_CONFIG, config_flags);
	if (!cfg) {
		return 0;
	} else if (cfg == CONFIG_STATUS_FILEINVALID) {
		ast_log(LOG_ERROR, "Config file %s is in an invalid format.  Aborting.\n", GOOGLE_CONFIG);
		return 0;
	}

	/* Copy the default jb config over global_jbconf */
	memcpy(&global_jbconf, &default_jbconf, sizeof(struct ast_jb_conf));

	/* set defaults */
	memset(&prefs, 0, sizeof(prefs));
	memset(&stunaddr, 0, sizeof(stunaddr));
	global_stunaddr = 0;
	global_allowguest = DEFAULT_ALLOWGUEST;
	ast_copy_string(global_context, DEFAULT_CONTEXT, sizeof(global_context));
	ast_copy_string(global_parkinglot, DEFAULT_PARKINGLOT, sizeof(global_parkinglot));

	cat = ast_category_browse(cfg, NULL);
	for (var = ast_variable_browse(cfg, "general"); var; var = var->next) {
		/* handle jb conf */
		if (!ast_jb_read_conf(&global_jbconf, var->name, var->value)) {
			continue;
		}

		if (!strcasecmp(var->name, "allowguest")) {
			global_allowguest = (ast_true(ast_variable_retrieve(cfg, "general", "allowguest"))) ? 1 : 0;
		} else if (!strcasecmp(var->name, "disallow")) {
			ast_parse_allow_disallow(&prefs, global_capability, var->value, 0);
		} else if (!strcasecmp(var->name, "allow")) {
			ast_parse_allow_disallow(&prefs, global_capability, var->value, 1);
		} else if (!strcasecmp(var->name, "context")) {
			ast_copy_string(global_context, var->value, sizeof(global_context));
		} else if (!strcasecmp(var->name, "externip")) {
			ast_copy_string(externip, var->value, sizeof(externip));
		} else if (!strcasecmp(var->name, "parkinglot")) {
			ast_copy_string(global_parkinglot, var->value, sizeof(global_parkinglot));
		} else if (!strcasecmp(var->name, "bindaddr")) {
			if (!(hp = ast_gethostbyname(var->value, &ahp))) {
				ast_log(LOG_WARNING, "Invalid address: %s\n", var->value);
			} else {
				memcpy(&bindaddr.sin_addr, hp->h_addr, sizeof(bindaddr.sin_addr));
			}
		} else if (!strcasecmp(var->name, "stunaddr")) {
			stunaddr.sin_port = htons(STANDARD_STUN_PORT);
			global_stunaddr = 1;
			if (ast_parse_arg(var->value, PARSE_INADDR, &stunaddr)) {
				ast_log(LOG_WARNING, "Invalid STUN server address: %s\n", var->value);
			}
		}
	}
	while (cat) {
		if (strcasecmp(cat, "general")) {
			var = ast_variable_browse(cfg, cat);
			member = ast_calloc(1, sizeof(*member));
			ASTOBJ_INIT(member);
			ASTOBJ_WRLOCK(member);
			member->cap = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_NOLOCK);
			if (!strcasecmp(cat, "guest")) {
				ast_copy_string(member->name, "guest", sizeof(member->name));
				ast_copy_string(member->user, "guest", sizeof(member->user));
				ast_copy_string(member->context, global_context, sizeof(member->context));
				ast_copy_string(member->parkinglot, global_parkinglot, sizeof(member->parkinglot));
				member->allowguest = global_allowguest;
				member->prefs = prefs;
				while (var) {
					if (!strcasecmp(var->name, "disallow")) {
						ast_parse_allow_disallow(&member->prefs, member->cap,
												 var->value, 0);
					} else if (!strcasecmp(var->name, "allow")) {
						ast_parse_allow_disallow(&member->prefs, member->cap,
												 var->value, 1);
					} else if (!strcasecmp(var->name, "context")) {
						ast_copy_string(member->context, var->value,
										sizeof(member->context));
					} else if (!strcasecmp(var->name, "parkinglot")) {
						ast_copy_string(member->parkinglot, var->value,
										sizeof(member->parkinglot));
					}
					var = var->next;
				}
				ASTOBJ_UNLOCK(member);
				clients = ast_aji_get_clients();
				if (clients) {
					ASTOBJ_CONTAINER_TRAVERSE(clients, 1, {
						ASTOBJ_WRLOCK(iterator);
						ASTOBJ_WRLOCK(member);
						if (member->connection) {
							ASTOBJ_UNREF(member->connection, ast_aji_client_destroy);
						}
						member->connection = NULL;
						iks_filter_add_rule(iterator->f, gtalk_parser, member, IKS_RULE_TYPE, IKS_PAK_IQ, IKS_RULE_NS, GOOGLE_NS, IKS_RULE_DONE);
						iks_filter_add_rule(iterator->f, gtalk_parser, member, IKS_RULE_TYPE, IKS_PAK_IQ, IKS_RULE_NS, GOOGLE_JINGLE_NS, IKS_RULE_DONE);
						iks_filter_add_rule(iterator->f, gtalk_parser, member, IKS_RULE_TYPE, IKS_PAK_IQ, IKS_RULE_NS, "http://jabber.org/protocol/gtalk", IKS_RULE_DONE);
						ASTOBJ_UNLOCK(member);
						ASTOBJ_UNLOCK(iterator);
					});
					ASTOBJ_CONTAINER_LINK(&gtalk_list, member);
					ASTOBJ_UNREF(member, gtalk_member_destroy);
				} else {
					ASTOBJ_UNLOCK(member);
					ASTOBJ_UNREF(member, gtalk_member_destroy);
				}
			} else {
				ASTOBJ_UNLOCK(member);
				if (gtalk_create_member(cat, var, global_allowguest, prefs, global_context, member)) {
					ASTOBJ_CONTAINER_LINK(&gtalk_list, member);
				}
				ASTOBJ_UNREF(member, gtalk_member_destroy);
			}
		}
		cat = ast_category_browse(cfg, cat);
	}

	ast_config_destroy(cfg);
	gtalk_update_externip();
	gtalk_free_candidates(global_candidates);
	return 1;
}

/*!
 * \brief Load the module
 *
 * Module loading including tests for configuration or dependencies.
 * This function can return AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_DECLINE,
 * or AST_MODULE_LOAD_SUCCESS. If a dependency or environment variable fails
 * tests return AST_MODULE_LOAD_FAILURE. If the module can not load the
 * configuration file or other non-critical problem return
 * AST_MODULE_LOAD_DECLINE. On success return AST_MODULE_LOAD_SUCCESS.
 */
static int load_module(void)
{
	struct ast_sockaddr bindaddr_tmp;
	struct ast_sockaddr ourip_tmp;
	char *jabber_loaded = ast_module_helper("", "res_jabber.so", 0, 0, 0, 0);
	struct ast_format tmpfmt;

	if (!(gtalk_tech.capabilities = ast_format_cap_alloc(0))) {
		return AST_MODULE_LOAD_DECLINE;
	}
	if (!(global_capability = ast_format_cap_alloc(0))) {
		return AST_MODULE_LOAD_DECLINE;
	}

	ast_format_cap_add_all_by_type(gtalk_tech.capabilities, AST_FORMAT_TYPE_AUDIO);
	ast_format_cap_add(global_capability, ast_format_set(&tmpfmt, AST_FORMAT_ULAW, 0));
	ast_format_cap_add(global_capability, ast_format_set(&tmpfmt, AST_FORMAT_GSM, 0));
	ast_format_cap_add(global_capability, ast_format_set(&tmpfmt, AST_FORMAT_ALAW, 0));
	ast_format_cap_add(global_capability, ast_format_set(&tmpfmt, AST_FORMAT_H263, 0));

	free(jabber_loaded);
	if (!jabber_loaded) {
		/* If embedded, check for a different module name */
		jabber_loaded = ast_module_helper("", "res_jabber", 0, 0, 0, 0);
		free(jabber_loaded);
		if (!jabber_loaded) {
			ast_log(LOG_ERROR, "chan_gtalk.so depends upon res_jabber.so\n");
			return AST_MODULE_LOAD_DECLINE;
		}
	}

	ASTOBJ_CONTAINER_INIT(&gtalk_list);
	if (!gtalk_load_config()) {
		ast_log(LOG_ERROR, "Unable to read config file %s. Not loading module.\n", GOOGLE_CONFIG);
		return 0;
	}

	sched = ast_sched_context_create();
	if (!sched) {
		ast_log(LOG_WARNING, "Unable to create schedule context\n");
	}

	io = io_context_create();
	if (!io) {
		ast_log(LOG_WARNING, "Unable to create I/O context\n");
	}

	ast_sockaddr_from_sin(&bindaddr_tmp, &bindaddr);
	if (gtalk_get_local_ip(&ourip_tmp)) {
		ast_log(LOG_WARNING, "Unable to get own IP address, Gtalk disabled\n");
		return 0;
	}
	__ourip.s_addr = htonl(ast_sockaddr_ipv4(&ourip_tmp));

	ast_rtp_glue_register(&gtalk_rtp_glue);
	ast_cli_register_multiple(gtalk_cli, ARRAY_LEN(gtalk_cli));

	/* Make sure we can register our channel type */
	if (ast_channel_register(&gtalk_tech)) {
		ast_log(LOG_ERROR, "Unable to register channel class %s\n", gtalk_tech.type);
		return -1;
	}
	return 0;
}

/*! \brief Reload module
 *  \todo XXX TODO make this work. */
#if 0
static int reload(void)
{
	return 0;
}
#endif
/*! \brief Unload the gtalk channel from Asterisk */
static int unload_module(void)
{
	struct gtalk_pvt *privates = NULL;
	ast_cli_unregister_multiple(gtalk_cli, ARRAY_LEN(gtalk_cli));
	/* First, take us out of the channel loop */
	ast_channel_unregister(&gtalk_tech);
	ast_rtp_glue_unregister(&gtalk_rtp_glue);

	if (!ast_mutex_lock(&gtalklock)) {
		/* Hangup all interfaces if they have an owner */
		ASTOBJ_CONTAINER_TRAVERSE(&gtalk_list, 1, {
			ASTOBJ_WRLOCK(iterator);
			privates = iterator->p;
			while(privates) {
				if (privates->owner)
					ast_softhangup(privates->owner, AST_SOFTHANGUP_APPUNLOAD);
				privates = privates->next;
			}
			iterator->p = NULL;
			ASTOBJ_UNLOCK(iterator);
		});
		ast_mutex_unlock(&gtalklock);
	} else {
		ast_log(LOG_WARNING, "Unable to lock the monitor\n");
		return -1;
	}
	ASTOBJ_CONTAINER_DESTROYALL(&gtalk_list, gtalk_member_destroy);
	ASTOBJ_CONTAINER_DESTROY(&gtalk_list);
	global_capability = ast_format_cap_destroy(global_capability);
	gtalk_tech.capabilities = ast_format_cap_destroy(gtalk_tech.capabilities);
	return 0;
}

AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Gtalk Channel Driver",
		.load = load_module,
		.unload = unload_module,
		/* .reload = reload, */
		.load_pri = AST_MODPRI_CHANNEL_DRIVER,
		);