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Last updated: Sat Feb 3 05:00:33 2007

Asterisk developer's documentation :: Codename Pineapple

---

chan_gtalk.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, Digium, Inc.
 *
 * Matt O'Gorman <mogorman@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 Matt O'Gorman <mogorman@digium.com>
 *
 * \brief Gtalk Channel Driver, until google/libjingle works with jingle spec
 * 
 * \ingroup channel_drivers
 */

/*** MODULEINFO
   <depend>iksemel</depend>
 ***/

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision: 51806 $")

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <errno.h>
#include <stdlib.h>
#include <fcntl.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/signal.h>
#include <iksemel.h>

#include "asterisk/lock.h"
#include "asterisk/channel.h"
#include "asterisk/config.h"
#include "asterisk/logger.h"
#include "asterisk/module.h"
#include "asterisk/pbx.h"
#include "asterisk/options.h"
#include "asterisk/lock.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/utils.h"
#include "asterisk/causes.h"
#include "asterisk/astobj.h"
#include "asterisk/abstract_jb.h"
#include "asterisk/jabber.h"

#define GOOGLE_CONFIG "gtalk.conf"

#define GOOGLE_NS "http://www.google.com/session"


/*! Global jitterbuffer configuration - by default, jb is disabled */
static struct ast_jb_conf default_jbconf =
{
   .flags = 0,
   .max_size = -1,
   .resync_threshold = -1,
   .impl = ""
};
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[100];
   char them[100];
   char ring[10];                   /*!< Message ID of ring */
   iksrule *ringrule;               /*!< Rule for matching RING request */
   int initiator;                   /*!< If we're the initiator */
   int alreadygone;
   int capability;
   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 *rtp;             /*!< RTP audio session */
   struct ast_rtp *vrtp;            /*!< RTP video session */
   int jointcapability;             /*!< Supported capability at both ends (codecs ) */
   int peercapability;
   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[100];
   char context[100];
   char accountcode[AST_MAX_ACCOUNT_CODE];   /*!< Account code */
   int capability;
   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 int global_capability = AST_FORMAT_ULAW | AST_FORMAT_ALAW | AST_FORMAT_GSM | AST_FORMAT_H263;

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

/* Forward declarations */
static struct ast_channel *gtalk_request(const char *type, int format, void *data, int *cause);
static int gtalk_digit(struct ast_channel *ast, char digit, unsigned int duration);
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, char *dest, int timeout);
static int gtalk_hangup(struct ast_channel *ast);
static int gtalk_answer(struct ast_channel *ast);
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_do_reload(int fd, int argc, char **argv);
static int gtalk_show_channels(int fd, int argc, char **argv);
/*----- RTP interface functions */
static int gtalk_set_rtp_peer(struct ast_channel *chan, struct ast_rtp *rtp,
                        struct ast_rtp *vrtp, int codecs, int nat_active);
static enum ast_rtp_get_result gtalk_get_rtp_peer(struct ast_channel *chan, struct ast_rtp **rtp);
static int gtalk_get_codec(struct ast_channel *chan);

/*! \brief PBX interface structure for channel registration */
static const struct ast_channel_tech gtalk_tech = {
   .type = "Gtalk",
   .description = "Gtalk Channel Driver",
   .capabilities = ((AST_FORMAT_MAX_AUDIO << 1) - 1),
   .requester = gtalk_request,
   .send_digit_begin = gtalk_digit_begin,
   .send_digit_end = gtalk_digit_end,
   .bridge = ast_rtp_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 sched_context *sched; /*!< The scheduling context */
static struct io_context *io; /*!< The IO context */
static struct in_addr __ourip;


/*! \brief RTP driver interface */
static struct ast_rtp_protocol gtalk_rtp = {
   type: "Gtalk",
   get_rtp_info: gtalk_get_rtp_peer,
   set_rtp_peer: gtalk_set_rtp_peer,
   get_codec: gtalk_get_codec,
};

static const char debug_usage[] = 
"Usage: gtalk show channels\n" 
"       Shows current state of the Gtalk channels.\n";

static const char reload_usage[] = 
"Usage: gtalk reload\n" 
"       Reload gtalk channel driver.\n";


static struct ast_cli_entry gtalk_cli[] = {
   {{ "gtalk", "reload", NULL}, gtalk_do_reload, "Enable Jabber debugging", reload_usage },
   {{ "gtalk", "show", "channels", NULL}, gtalk_show_channels, "Show GoogleTalk Channels", debug_usage },
 };



static char externip[16];

static struct gtalk_container gtalk_list;

static void gtalk_member_destroy(struct gtalk *obj)
{
   free(obj);
}

static struct gtalk *find_gtalk(char *name, char *connection)
{
   struct gtalk *gtalk = NULL;
   char *domain = NULL , *s = NULL;
   if(strchr(connection, '@')) {
      s = ast_strdupa((char *) connection);
      domain = strsep(&s, "@");
      ast_verbose("OOOOH domain = %s\n", domain);
      free(s);
   }
   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_WRLOCK(iterator);
         if (!strcasecmp(iterator->name, "guest")) {
            if (!strcasecmp(iterator->connection->jid->partial, connection)) {
               gtalk = iterator;
               break;
            } else if (!strcasecmp(iterator->connection->name, connection)) {
               gtalk = iterator;
               break;
            } else if (iterator->connection->component && !strcasecmp(iterator->connection->user,domain)) {
               gtalk = iterator;
               break;
            }
         }
         ASTOBJ_UNLOCK(iterator);
      });

   }
   return gtalk;
}


static int add_codec_to_answer(const struct gtalk_pvt *p, int codec, iks *dcodecs)
{
   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) {
         if(payload_pcmu)
            iks_delete(payload_pcmu);
         if(payload_eg711u)
            iks_delete(payload_eg711u);
         ast_log(LOG_WARNING,"Failed to allocate iks node");
         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);
   }
   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) {
         if(payload_eg711a)
            iks_delete(payload_eg711a);
         if(payload_pcma)
            iks_delete(payload_pcma);
         ast_log(LOG_WARNING,"Failed to allocate iks node");
         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);
   }
   if (!strcasecmp("ilbc", format)) {
      iks *payload_ilbc = iks_new("payload-type");
      if(!payload_ilbc) {
         ast_log(LOG_WARNING,"Failed to allocate iks node");
         return -1;
      }
      iks_insert_attrib(payload_ilbc, "id", "102");
      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);
   }
   if (!strcasecmp("g723", format)) {
      iks *payload_g723 = iks_new("payload-type");
      if(!payload_g723) {
         ast_log(LOG_WARNING,"Failed to allocate iks node");
         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);
   }
   if (!strcasecmp("speex", format)) {
      iks *payload_speex = iks_new("payload-type");
      if(!payload_speex) {
         ast_log(LOG_WARNING,"Failed to allocate iks node");
         return -1;
      }
      iks_insert_attrib(payload_speex, "id", "98");
      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);
   }
   ast_rtp_lookup_code(p->rtp, 1, codec);
   return 0;
}

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;
   int pref_codec = 0;
   int alreadysent = 0;


   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)){
      if(iq)
         iks_delete(iq);
      if(gtalk)
         iks_delete(gtalk);
      if(dcodecs)
         iks_delete(dcodecs);
      if(transport)
         iks_delete(transport);
      if(payload_telephone)
         iks_delete(payload_telephone);

      ast_log(LOG_ERROR, "Could not allocate iksemel nodes\n");
      return 0;
   }
   iks_insert_attrib(dcodecs, "xmlns", "http://www.google.com/session/phone");
   iks_insert_attrib(dcodecs, "xml:lang", "en");

   for (x = 0; x < 32; x++) {
      if (!(pref_codec = ast_codec_pref_index(&client->prefs, x)))
         break;
      if (!(client->capability & pref_codec))
         continue;
      if (alreadysent & pref_codec)
         continue;
      add_codec_to_answer(p, pref_codec, dcodecs);
      alreadysent |= pref_codec;
   }
   
   iks_insert_attrib(payload_telephone, "id", "106");
   iks_insert_attrib(payload_telephone, "name", "telephone-event");
   iks_insert_attrib(payload_telephone, "clockrate", "8000");
   
   iks_insert_attrib(transport,"xmlns","http://www.google.com/transport/p2p");
   
   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", "http://www.google.com/session");
   iks_insert_attrib(gtalk, "type",initiator ? "initiate": "accept");
   iks_insert_attrib(gtalk, "initiator", initiator ? from : to);
   iks_insert_attrib(gtalk, "id", sid);
   iks_insert_node(iq, gtalk);
   iks_insert_node(gtalk, dcodecs);
   iks_insert_node(gtalk, transport);
   iks_insert_node(dcodecs, payload_telephone);

   iks_send(client->connection->p, iq);
   iks_delete(payload_telephone);
   iks_delete(transport);
   iks_delete(dcodecs);
   iks_delete(gtalk);
   iks_delete(iq);
   return 1;
}

static int gtalk_invite_response(struct gtalk_pvt *p, char *to , char *from, char *sid, int initiator)
{
   iks *iq, *session, *transport;
   iq = iks_new("iq");
   session = iks_new("session");
   transport = iks_new("transport");
   if(!(iq && session && transport)) {
      if(iq)
         iks_delete(iq);
      if(session)
         iks_delete(session);
      if(transport)
         iks_delete(transport);
      ast_log(LOG_ERROR, " Unable to allocate IKS node\n");
      return -1;
   }
   iks_insert_attrib(iq, "from", from);
   iks_insert_attrib(iq, "to", to);
   iks_insert_attrib(iq, "type", "set");
   iks_insert_attrib(iq, "id",p->parent->connection->mid);
   ast_aji_increment_mid(p->parent->connection->mid);
   iks_insert_attrib(session, "type", "transport-accept");
   iks_insert_attrib(session, "id", sid);
   iks_insert_attrib(session, "initiator", initiator ? from : to);
   iks_insert_attrib(session, "xmlns", "http://www.google.com/session");
   iks_insert_attrib(transport, "xmlns", "http://www.google.com/transport/p2p");
   iks_insert_node(iq,session);
   iks_insert_node(session,transport);
   iks_send(p->parent->connection->p, iq);
   iks_delete(transport);
   iks_delete(session);
   iks_delete(iq);
   return 1;

}

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

   if (p->ringrule)
      iks_filter_remove_rule(p->parent->connection->f, p->ringrule);
   p->ringrule = NULL;
   if (p->owner)
      ast_queue_control(p->owner, AST_CONTROL_RINGING);
   return IKS_FILTER_EAT;
}

static int gtalk_answer(struct ast_channel *ast)
{
   struct gtalk_pvt *p = ast->tech_pvt;
   int res = 0;
   
   if (option_debug)
      ast_log(LOG_DEBUG, "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_get_result gtalk_get_rtp_peer(struct ast_channel *chan, struct ast_rtp **rtp)
{
   struct gtalk_pvt *p = chan->tech_pvt;
   enum ast_rtp_get_result res = AST_RTP_GET_FAILED;

   if (!p)
      return res;

   ast_mutex_lock(&p->lock);
   if (p->rtp){
      *rtp = p->rtp;
      res = AST_RTP_TRY_NATIVE;
   }
   ast_mutex_unlock(&p->lock);

   return res;
}

static int gtalk_get_codec(struct ast_channel *chan)
{
   struct gtalk_pvt *p = chan->tech_pvt;
   return p->peercapability;
}

static int gtalk_set_rtp_peer(struct ast_channel *chan, struct ast_rtp *rtp, struct ast_rtp *vrtp, int codecs, int nat_active)
{
   struct gtalk_pvt *p;

   p = chan->tech_pvt;
   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 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", iks_find_attrib(pak->x, "from"));
      iks_insert_attrib(response, "id", 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);
         }
      }
      iks_send(client->connection->p, response);
      if (reason)
         iks_delete(reason);
      if (error)
         iks_delete(error);
      iks_delete(response);
      res = 0;
   }
   return res;
}

static int gtalk_is_answered(struct gtalk *client, ikspak *pak)
{
   struct gtalk_pvt *tmp;
   char *from;
   if (option_debug)
      ast_log(LOG_DEBUG, "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))
         break;
   }
   
   from = iks_find_attrib(pak->x, "to");
   if(!from)
      from = client->connection->jid->full;

   if (tmp) {
      if (tmp->owner)
         ast_queue_control(tmp->owner, AST_CONTROL_ANSWER);
   } else
      ast_log(LOG_NOTICE, "Whoa, didn't find call!\n");
   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;
   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))
         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 = dtmf[0];
               ast_queue_frame(tmp->owner, &f);
               ast_verbose("GOOGLE! DTMF-relay event received: %c\n", f.subclass);
            } else if(iks_find_with_attrib(pak->x, "dtmf", "action", "button-down")) {
               struct ast_frame f = {AST_FRAME_DTMF_END, };
               f.subclass = dtmf[0];
               ast_queue_frame(tmp->owner, &f);
               ast_verbose("GOOGLE! DTMF-relay event received: %c\n", f.subclass);
            } else if(iks_find_attrib(pak->x, "dtmf")) { /* 250 millasecond default */
               struct ast_frame f = {AST_FRAME_DTMF, };
               f.subclass = dtmf[0];
               ast_queue_frame(tmp->owner, &f);
               ast_verbose("GOOGLE! DTMF-relay event received: %c\n", f.subclass);
            }
         }
      }
      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;

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


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

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;
   struct sockaddr_in dest;
   struct in_addr us;
   iks *iq, *gtalk, *candidate, *transport;
   char user[17], pass[17], preference[5], port[7];


   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","http://www.google.com/transport/p2p");
   iks_insert_node(iq, gtalk);
   iks_insert_node(gtalk,transport);
   iks_insert_node(transport, candidate);

   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_get_us(p->rtp, &sin);
   ast_find_ourip(&us, bindaddr);

   /* 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_inet_ntoa(us), sizeof(ours1->ip));
   ours1->protocol = AJI_PROTOCOL_UDP;
   ours1->type = AJI_CONNECT_LOCAL;
   ours1->generation = 0;
   p->ourcandidates = ours1;

   if (!ast_strlen_zero(externip)) {
      /* XXX We should really stun for this one not just go with externip XXX */
      snprintf(user, sizeof(user), "%08lx%08lx", ast_random(), ast_random());
      snprintf(pass, sizeof(pass), "%08lx%08lx", ast_random(), ast_random());
      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;
   dest.sin_addr = __ourip;
   dest.sin_port = sin.sin_port;


   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", "transport-info");
      iks_insert_attrib(gtalk, "id", sid);
      iks_insert_attrib(gtalk, "initiator", (p->initiator) ? to : from);
      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");
      iks_send(c->p, iq);
   }
   p->laststun = 0;

safeout:
   if (ours1)
      free(ours1);
   if (ours2)
      free(ours2);
   if (iq)
      iks_delete(iq);
   if (gtalk)
      iks_delete(gtalk);
   if (candidate)
      iks_delete(candidate);
   if(transport)
      iks_delete(transport);
   return 1;
}

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;
   char idroster[200];
   char *data, *exten = NULL;

   if (option_debug)
      ast_log(LOG_DEBUG, "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 
         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 {
         ast_log(LOG_ERROR, "no gtalk capable clients to talk to.\n");
         return NULL;
      }
   }
   if (!(tmp = ast_calloc(1, sizeof(*tmp)))) {
      return NULL;
   }
   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;
   }
   tmp->rtp = ast_rtp_new_with_bindaddr(sched, io, 1, 0, bindaddr.sin_addr);
   tmp->parent = client;
   if (!tmp->rtp) {
      ast_log(LOG_WARNING, "Out of RTP sessions?\n");
      free(tmp);
      return NULL;
   }

   if(strchr(tmp->us, '/')) {
      data = ast_strdupa((char *) tmp->us);
      exten = strsep(&data, "/");
   } else
      exten = tmp->us;
   ast_copy_string(tmp->exten,  exten, sizeof(tmp->exten));
   if(data)
      free(data);
   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)
{
   struct ast_channel *tmp;
   int fmt;
   int what;
   const char *n2;

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

   /* Select our native format based on codec preference until we receive
      something from another device to the contrary. */
/* ast_verbose("XXXXXXXXXXXXX\nXXX i->jointcapability = %X\nXXX i->capability = %X\nXXX global_capability %X\n XXXXXXXXXXXX\n",i->jointcapability,i->capability,global_capability); */
   if (i->jointcapability)
      what = i->jointcapability;
   else if (i->capability)
      what = i->capability;
   else
      what = global_capability;
   tmp->nativeformats = ast_codec_choose(&i->prefs, what, 1) | (i->jointcapability & AST_FORMAT_VIDEO_MASK);
   fmt = ast_best_codec(tmp->nativeformats);

   if (i->rtp) {
      ast_rtp_setstun(i->rtp, 1);
      tmp->fds[0] = ast_rtp_fd(i->rtp);
      tmp->fds[1] = ast_rtcp_fd(i->rtp);
   }
   if (i->vrtp) {
      ast_rtp_setstun(i->rtp, 1);
      tmp->fds[2] = ast_rtp_fd(i->vrtp);
      tmp->fds[3] = ast_rtcp_fd(i->vrtp);
   }
   if (state == AST_STATE_RING)
      tmp->rings = 1;
   tmp->adsicpe = AST_ADSI_UNAVAILABLE;
   tmp->writeformat = fmt;
   tmp->rawwriteformat = fmt;
   tmp->readformat = fmt;
   tmp->rawreadformat = fmt;
   tmp->tech_pvt = i;

   tmp->callgroup = client->callgroup;
   tmp->pickupgroup = client->pickupgroup;
   tmp->cid.cid_pres = client->callingpres;
   if (!ast_strlen_zero(client->accountcode))
      ast_string_field_set(tmp, accountcode, client->accountcode);
   if (client->amaflags)
      tmp->amaflags = client->amaflags;
   if (!ast_strlen_zero(client->language))
      ast_string_field_set(tmp, language, client->language);
   if (!ast_strlen_zero(client->musicclass))
      ast_string_field_set(tmp, musicclass, client->musicclass);
   i->owner = tmp;
   ast_module_ref(ast_module_info->self);
   ast_copy_string(tmp->context, client->context, sizeof(tmp->context));
   ast_copy_string(tmp->exten, i->exten, sizeof(tmp->exten));
   /* Don't use ast_set_callerid() here because it will
    * generate a needless NewCallerID event */
   tmp->cid.cid_num = ast_strdup(i->cid_num);
   tmp->cid.cid_ani = ast_strdup(i->cid_num);
   tmp->cid.cid_name = ast_strdup(i->cid_name);
   if (!ast_strlen_zero(i->exten) && strcmp(i->exten, "s"))
      tmp->cid.cid_dnid = ast_strdup(i->exten);
   tmp->priority = 1;
   if (i->rtp)
      ast_jb_configure(tmp, &global_jbconf);
   if (state != AST_STATE_DOWN && ast_pbx_start(tmp)) {
      ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);
      tmp->hangupcause = 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;

   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);
         iks_insert_attrib(session, "initiator", p->initiator ? p->us : p->them);
         iks_insert_attrib(session, "xmlns", "http://www.google.com/session");
         iks_insert_node(request, session);
         iks_send(client->connection->p, request);
         iks_delete(session);
         res = 0;
      }
      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;
      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_destroy(p->rtp);
   if (p->vrtp)
      ast_rtp_destroy(p->vrtp);
   gtalk_free_candidates(p->theircandidates);
   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;
   /* 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)) {
         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;
   }

   p = gtalk_alloc(client, from, pak->from->full, iks_find_attrib(pak->query, "id"));
   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);
   if (chan) {
      ast_mutex_lock(&p->lock);
      ast_copy_string(p->them, pak->from->full, sizeof(p->them));
      if (iks_find_attrib(pak->query, "id")) {
         ast_copy_string(p->sid, iks_find_attrib(pak->query, "id"),
                     sizeof(p->sid));
      }

      codec = iks_child(iks_child(iks_child(pak->x)));
      while (codec) {
         ast_rtp_set_m_type(p->rtp, atoi(iks_find_attrib(codec, "id")));
         ast_rtp_set_rtpmap_type(p->rtp, atoi(iks_find_attrib(codec, "id")), "audio",
                  iks_find_attrib(codec, "name"), 0);
         codec = iks_next(codec);
      }
      
      ast_mutex_unlock(&p->lock);
      ast_setstate(chan, AST_STATE_RING);
      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_invite_response(p, p->them, p->us,p->sid, 0);
         gtalk_create_candidates(client, p, p->sid, p->them, p->us);
         /* nothing to do */
         break;
      }
   } else {
      gtalk_free_pvt(client, p);
   }
   return 1;
}

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;

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

   tmp = p->theircandidates;
   p->laststun = time(NULL);
   while (tmp) {
      char username[256];
      hp = ast_gethostbyname(tmp->ip, &ahp);
      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);

      ast_rtp_stun_request(p->rtp, &sin, username);
      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;

   newcandidate = ast_calloc(1, sizeof(*newcandidate));
   if (!newcandidate)
      return 0;
   for (tmp = client->p; tmp; tmp = tmp->next) {
      if (iks_find_with_attrib(pak->x, "session", "id", tmp->sid)) {
         p = tmp;
         break;
      }
   }

   if (!p)
      return -1;

   traversenodes = pak->query;
   while(traversenodes) {
      if(!strcasecmp(iks_name(traversenodes), "session")) {
         traversenodes = iks_child(traversenodes);
         continue;
      }
      if(!strcasecmp(iks_name(traversenodes), "transport")) {
         traversenodes = iks_child(traversenodes);
         continue;
      }
      if(!strcasecmp(iks_name(traversenodes), "candidate")) {
         newcandidate = ast_calloc(1, sizeof(*newcandidate));
         if (!newcandidate)
            return 0;
         ast_copy_string(newcandidate->name, iks_find_attrib(traversenodes, "name"),
                     sizeof(newcandidate->name));
         ast_copy_string(newcandidate->ip, iks_find_attrib(traversenodes, "address"),
                     sizeof(newcandidate->ip));
         newcandidate->port = atoi(iks_find_attrib(traversenodes, "port"));
         ast_copy_string(newcandidate->username, iks_find_attrib(traversenodes, "username"),
                     sizeof(newcandidate->username));
         ast_copy_string(newcandidate->password, iks_find_attrib(traversenodes, "password"),
                     sizeof(newcandidate->password));
         newcandidate->preference = atof(iks_find_attrib(traversenodes, "preference"));
         if (!strcasecmp(iks_find_attrib(traversenodes, "protocol"), "udp"))
            newcandidate->protocol = AJI_PROTOCOL_UDP;
         if (!strcasecmp(iks_find_attrib(traversenodes, "protocol"), "ssltcp"))
            newcandidate->protocol = AJI_PROTOCOL_SSLTCP;
      
         if (!strcasecmp(iks_find_attrib(traversenodes, "type"), "stun"))
            newcandidate->type = AJI_CONNECT_STUN;
         if (!strcasecmp(iks_find_attrib(traversenodes, "type"), "local"))
            newcandidate->type = AJI_CONNECT_LOCAL;
         if (!strcasecmp(iks_find_attrib(traversenodes, "type"), "relay"))
            newcandidate->type = AJI_CONNECT_RELAY;
         ast_copy_string(newcandidate->network, iks_find_attrib(traversenodes, "network"),
                     sizeof(newcandidate->network));
         newcandidate->generation = atoi(iks_find_attrib(traversenodes, "generation"));
         newcandidate->next = NULL;
      
         newcandidate->next = p->theircandidates;
         p->theircandidates = newcandidate;
         p->laststun = 0;
         gtalk_update_stun(p->parent, p);
         newcandidate = NULL;
      }
      traversenodes = iks_next(traversenodes);
   }
   
   receipt = iks_new("iq");
   iks_insert_attrib(receipt, "type", "result");
   iks_insert_attrib(receipt, "from", from);
   iks_insert_attrib(receipt, "to", iks_find_attrib(pak->x, "from"));
   iks_insert_attrib(receipt, "id", iks_find_attrib(pak->x, "id"));
   iks_send(c->p, 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_read(p->rtp);
   gtalk_update_stun(p->parent, p);
   if (p->owner) {
      /* We already hold the channel lock */
      if (f->frametype == AST_FRAME_VOICE) {
         if (f->subclass != (p->owner->nativeformats & AST_FORMAT_AUDIO_MASK)) {
            if (option_debug)
               ast_log(LOG_DEBUG, "Oooh, format changed to %d\n", f->subclass);
            p->owner->nativeformats =
               (p->owner->nativeformats & AST_FORMAT_VIDEO_MASK) | f->subclass;
            ast_set_read_format(p->owner, p->owner->readformat);
            ast_set_write_format(p->owner, p->owner->writeformat);
         }
/*       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))
               if (option_debug)
                  ast_log(LOG_DEBUG, "* 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->tech_pvt;

   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->tech_pvt;
   int res = 0;

   switch (frame->frametype) {
   case AST_FRAME_VOICE:
      if (!(frame->subclass & ast->nativeformats)) {
         ast_log(LOG_WARNING,
               "Asked to transmit frame type %d, while native formats is %d (read/write = %d/%d)\n",
               frame->subclass, ast->nativeformats, ast->readformat,
               ast->writeformat);
         return 0;
      }
      if (p) {
         ast_mutex_lock(&p->lock);
         if (p->rtp) {
            res = ast_rtp_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_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 = newchan->tech_pvt;
   ast_mutex_lock(&p->lock);

   if ((p->owner != oldchan)) {
      ast_mutex_unlock(&p->lock);
      return -1;
   }
   if (p->owner == oldchan)
      p->owner = 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_log(LOG_NOTICE, "Don't know how to indicate condition '%d'\n", condition);
      res = -1;
   }

   return res;
}

static int gtalk_digit_begin(struct ast_channel *chan, char digit)
{
   return gtalk_digit(chan, digit, 0);
}

static int gtalk_digit_end(struct ast_channel *chan, char digit, unsigned int duration)
{
   return gtalk_digit(chan, digit, duration);
}

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'};
   iq = iks_new("iq");
   gtalk = iks_new("gtalk");
   dtmf = iks_new("dtmf");
   if(!iq || !gtalk || !dtmf) {
      if(iq)
         iks_delete(iq);
      if(gtalk)
         iks_delete(gtalk);
      if(dtmf)
         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", "content-info");
   iks_insert_attrib(gtalk, "initiator", p->initiator ? p->us: p->them);
   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) {
      iks_insert_attrib(dtmf, "action", "button-down");
   } else if (ast->dtmff.frametype == AST_FRAME_DTMF_END) {
      iks_insert_attrib(dtmf, "action", "button-up");
   }
   iks_send(client->connection->p, iq);
   iks_delete(iq);
   iks_delete(gtalk);
   iks_delete(dtmf);
   ast_mutex_unlock(&p->lock);
   return 0;
}

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;
}

/* Not in use right now.
static int gtalk_auto_congest(void *nothing)
{
   struct gtalk_pvt *p = nothing;

   ast_mutex_lock(&p->lock);
   if (p->owner) {
      if (!ast_channel_trylock(p->owner)) {
         ast_log(LOG_NOTICE, "Auto-congesting %s\n", p->owner->name);
         ast_queue_control(p->owner, AST_CONTROL_CONGESTION);
         ast_channel_unlock(p->owner);
      }
   }
   ast_mutex_unlock(&p->lock);
   return 0;
}
*/

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

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

   ast_setstate(ast, AST_STATE_RING);
   p->jointcapability = p->capability;
   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);
   gtalk_create_candidates(p->parent, p, p->sid, p->them, p->us);

   return 0;
}

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

   ast_mutex_lock(&p->lock);
   client = p->parent;
   p->owner = NULL;
   ast->tech_pvt = 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, int format, void *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((char *) data);
      if (s) {
         sender = strsep(&s, "/");
         if (sender && (sender[0] != '\0'))
            to = strsep(&s, "/");
         if (!to) {
            ast_log(LOG_ERROR, "Bad arguments in Gtalk Dialstring: %s\n", (char*) data);
            if (s)
               free(s);
            return NULL;
         }
      }
   }
   client = find_gtalk(to, sender);
   if (!client) {
      ast_log(LOG_WARNING, "Could not find recipient.\n");
      if (s)
         free(s);
      return NULL;
   }
   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);

   return chan;
}

/*! \brief CLI command "gtalk show channels" */
static int gtalk_show_channels(int fd, int argc, char **argv)
{
   if (argc != 3)
      return RESULT_SHOWUSAGE;
   ast_mutex_lock(&gtalklock);
// if (!gtalk_list->p)
      ast_cli(fd, "No gtalk channels in use\n");
   ast_mutex_unlock(&gtalklock);
   return RESULT_SUCCESS;
}

/*! \brief CLI command "gtalk show channels" */
static int gtalk_do_reload(int fd, int argc, char **argv)
{
   ast_verbose("IT DOES WORK!\n");
   return RESULT_SUCCESS;
}

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

   if (iks_find_with_attrib(pak->x, "session", "type", "initiate")) {
      /* New call */
      gtalk_newcall(client, pak);
   } else if (iks_find_with_attrib(pak->x, "session", "type", "candidates") || iks_find_with_attrib(pak->x, "session", "type", "transport-info") ) {
      if (option_debug > 2)
         ast_log(LOG_DEBUG, "About to add candidate!\n");
      gtalk_add_candidate(client, pak);
      if (option_debug > 2)
         ast_log(LOG_DEBUG, "Candidate Added!\n");
   } else if (iks_find_with_attrib(pak->x, "session", "type", "accept")) {
      gtalk_is_answered(client, pak);
   } else if (iks_find_with_attrib(pak->x, "session", "type", "content-info")) {
      gtalk_handle_dtmf(client, pak);
   } else if (iks_find_with_attrib(pak->x, "session", "type", "terminate")) {
      gtalk_hangup_farend(client, pak);
   } else if (iks_find_with_attrib(pak->x, "session", "type", "reject")) {
      gtalk_hangup_farend(client, pak);
   }
   ASTOBJ_UNREF(client, gtalk_member_destroy);
   return IKS_FILTER_EAT;
}

/* Not using this anymore probably take out soon 
static struct gtalk_candidate *gtalk_create_candidate(char *args)
{
   char *name, *type, *preference, *protocol;
   struct gtalk_candidate *res;
   res = malloc(sizeof(struct gtalk_candidate));
   memset(res, 0, sizeof(struct gtalk_candidate));
   if (args)
      name = args;
   if ((args = strchr(args, ','))) {
      *args = '\0';
      args++;
      preference = args;
   }
   if ((args = strchr(args, ','))) {
      *args = '\0';
      args++;
      protocol = args;
   }
   if ((args = strchr(args, ','))) {
      *args = '\0';
      args++;
      type = args;
   }
   if (name)
      ast_copy_string(res->name, name, sizeof(res->name));
   if (preference) {
      res->preference = atof(preference);
   }
   if (protocol) {
      if (!strcasecmp("udp", protocol))
         res->protocol = AJI_PROTOCOL_UDP;
      if (!strcasecmp("ssltcp", protocol))
         res->protocol = AJI_PROTOCOL_SSLTCP;
   }
   if (type) {
      if (!strcasecmp("stun", type))
         res->type = AJI_CONNECT_STUN;
      if (!strcasecmp("local", type))
         res->type = AJI_CONNECT_LOCAL;
      if (!strcasecmp("relay", type))
         res->type = AJI_CONNECT_RELAY;
   }

   return res;
}
*/

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 0
      struct gtalk_candidate *candidate = NULL;
#endif
      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->capability, var->value, 0);
      else if (!strcasecmp(var->name, "allow"))
         ast_parse_allow_disallow(&member->prefs, &member->capability, var->value, 1);
      else if (!strcasecmp(var->name, "context"))
         ast_copy_string(member->context, var->value, sizeof(member->context));
#if 0
      else if (!strcasecmp(var->name, "candidate")) {
         candidate = gtalk_create_candidate(var->value);
         if (candidate) {
            candidate->next = member->ourcandidates;
            member->ourcandidates = candidate;
         }
      }
#endif
      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, "http://www.google.com/session",
                           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;
   char context[100];
   int allowguest = 1;
   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;

   cfg = ast_config_load(GOOGLE_CONFIG);
   if (!cfg)
      return 0;

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

   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"))
         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(context, var->value, sizeof(context));
      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));
         }
      }
/*  Idea to allow for custom candidates  */
/*
      else if (!strcasecmp(var->name, "candidate")) {
         candidate = gtalk_create_candidate(var->value);
         if (candidate) {
            candidate->next = global_candidates;
            global_candidates = candidate;
         }
      }
*/
   }
   while (cat) {
      if (strcasecmp(cat, "general")) {
         var = ast_variable_browse(cfg, cat);
         member = (struct gtalk *) malloc(sizeof(struct gtalk));
         memset(member, 0, sizeof(struct gtalk));
         ASTOBJ_INIT(member);
         ASTOBJ_WRLOCK(member);
         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, context, sizeof(member->context));
            member->allowguest = allowguest;
            member->prefs = prefs;
            while (var) {
               if (!strcasecmp(var->name, "disallow"))
                  ast_parse_allow_disallow(&member->prefs, &member->capability,
                                     var->value, 0);
               else if (!strcasecmp(var->name, "allow"))
                  ast_parse_allow_disallow(&member->prefs, &member->capability,
                                     var->value, 1);
               else if (!strcasecmp(var->name, "context"))
                  ast_copy_string(member->context, var->value,
                              sizeof(member->context));
/*  Idea to allow for custom candidates  */
/*
               else if (!strcasecmp(var->name, "candidate")) {
                  candidate = gtalk_create_candidate(var->value);
                  if (candidate) {
                     candidate->next = member->ourcandidates;
                     member->ourcandidates = candidate;
                  }
               }
*/
               var = var->next;
            }
            ASTOBJ_UNLOCK(member);
            clients = ast_aji_get_clients();
            if (clients) {
               ASTOBJ_CONTAINER_TRAVERSE(clients, 1, {
                  ASTOBJ_WRLOCK(iterator);
                  ASTOBJ_WRLOCK(member);
                  member->connection = iterator;
                  iks_filter_add_rule(iterator->f, gtalk_parser, member, IKS_RULE_TYPE, IKS_PAK_IQ, IKS_RULE_NS,
                              "http://www.google.com/session", IKS_RULE_DONE);
                  ASTOBJ_UNLOCK(member);
                  ASTOBJ_CONTAINER_LINK(&gtalk_list, member);
                  ASTOBJ_UNLOCK(iterator);
               });
            } else {
               ASTOBJ_UNLOCK(member);
               ASTOBJ_UNREF(member, gtalk_member_destroy);
            }
         } else {
            ASTOBJ_UNLOCK(member);
            if (gtalk_create_member(cat, var, allowguest, prefs, context, member))
               ASTOBJ_CONTAINER_LINK(&gtalk_list, member);
            ASTOBJ_UNREF(member, gtalk_member_destroy);
         }
      }
      cat = ast_category_browse(cfg, cat);
   }
   gtalk_free_candidates(global_candidates);
   return 1;
}

/*! \brief Load module into PBX, register channel */
static int load_module(void)
{
   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 = 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");

   if (ast_find_ourip(&__ourip, bindaddr)) {
      ast_log(LOG_WARNING, "Unable to get own IP address, Gtalk disabled\n");
      return 0;
   }

   ast_rtp_proto_register(&gtalk_rtp);
   ast_cli_register_multiple(gtalk_cli, sizeof(gtalk_cli) / sizeof(gtalk_cli[0]));

   /* 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 */
static int reload(void)
{
   return 0;
}

/*! \brief Unload the gtalk channel from Asterisk */
static int unload_module(void)
{
   struct gtalk_pvt *privates = NULL;
   ast_cli_unregister_multiple(gtalk_cli, sizeof(gtalk_cli) / sizeof(gtalk_cli[0]));
   /* First, take us out of the channel loop */
   ast_channel_unregister(&gtalk_tech);
   ast_rtp_proto_unregister(&gtalk_rtp);

   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);
   return 0;
}

AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "Gtalk Channel Driver",
      .load = load_module,
      .unload = unload_module,
      .reload = reload,
          );

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