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>
 * 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.
 */

/*** 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: 372795 $")

#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/features.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);

/*! \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_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);
   manager_event(EVENT_FLAG_SYSTEM, "ChannelUpdate", "Channel: %s\r\nChanneltype: %s\r\nGtalk-SID: %s\r\n",
      ast_channel_name(ast), "GTALK", p->sid);
   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 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_nolock();
   tmp->jointcap = ast_format_cap_alloc_nolock();
   tmp->peercap = ast_format_cap_alloc_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_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);
   i->owner = 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);
   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;
   } else {
      manager_event(EVENT_FLAG_SYSTEM, "ChannelUpdate",
         "Channel: %s\r\nChanneltype: %s\r\nGtalk-SID: %s\r\n",
         i->owner ? ast_channel_name(i->owner) : "", "Gtalk", i->sid);
   }
   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_setstate(chan, AST_STATE_RING);
   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)
      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_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;
   p->owner = 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_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 module into PBX, register channel */
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())) {
      return AST_MODULE_LOAD_DECLINE;
   }
   if (!(global_capability = ast_format_cap_alloc())) {
      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,
      );