Sat Nov 1 06:28:24 2008

Asterisk developer's documentation

---

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>
   <depend>res_jabber</depend>
   <use>gnutls</use>
 ***/

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision: 139283 $")

#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 <pthread.h>

#ifdef HAVE_GNUTLS
#include <gcrypt.h>
GCRY_THREAD_OPTION_PTHREAD_IMPL;
#endif /* HAVE_GNUTLS */

#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[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;
   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[AJI_MAX_JIDLEN];
   char context[AST_MAX_CONTEXT];
   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_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_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 char show_channels_usage[] = 
"Usage: gtalk show channels\n" 
"       Shows current state of the Gtalk channels.\n";

static 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, "Reload GoogleTalk configuration", reload_usage },
   {{ "gtalk", "show", "channels", NULL}, gtalk_show_channels, "Show GoogleTalk channels", show_channels_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(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, int codec, iks *dcodecs)
{
   int res = 0;
   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);
      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) {
         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);
      res ++;
   }
   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", "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");
         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");
         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");
         return -1;
      }
      iks_insert_attrib(payload_gsm, "id", "103");
      iks_insert_attrib(payload_gsm, "name", "gsm");
      iks_insert_node(dcodecs, payload_gsm);
      res++;
   }
   ast_rtp_lookup_code(p->rtp, 1, codec);
   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;
   int pref_codec = 0;
   int alreadysent = 0;
   int codecs_num = 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;
      codecs_num = add_codec_to_answer(p, pref_codec, dcodecs);
      alreadysent |= pref_codec;
   }
   
   if (codecs_num) {
      /* only propose DTMF within an audio session */
      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_PARTIAL;
   }
   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;
   iks *codec;
   char s1[BUFSIZ], s2[BUFSIZ], s3[BUFSIZ];
   int peernoncodeccapability;

   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;
   }

   /* codec points to the first <payload-type/> tag */
   codec = iks_child(iks_child(iks_child(pak->x)));
   while (codec) {
      ast_rtp_set_m_type(tmp->rtp, atoi(iks_find_attrib(codec, "id")));
      ast_rtp_set_rtpmap_type(tmp->rtp, atoi(iks_find_attrib(codec, "id")), "audio", iks_find_attrib(codec, "name"), 0);
      codec = iks_next(codec);
   }
   
   /* Now gather all of the codecs that we are asked for */
   ast_rtp_get_current_formats(tmp->rtp, &tmp->peercapability, &peernoncodeccapability);
   
   /* at this point, we received an awser from the remote Gtalk client,
      which allows us to compare capabilities */
   tmp->jointcapability = tmp->capability & tmp->peercapability;
   if (!tmp->jointcapability) {
      ast_log(LOG_WARNING, "Capabilities don't match : us - %s, peer - %s, combined - %s \n", ast_getformatname_multiple(s1, BUFSIZ, tmp->capability),
         ast_getformatname_multiple(s2, BUFSIZ, tmp->peercapability),
         ast_getformatname_multiple(s3, BUFSIZ, tmp->jointcapability));
      /* 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) {
      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_is_accepted(struct gtalk *client, ikspak *pak)
{
   struct gtalk_pvt *tmp;
   char *from;

   ast_log(LOG_DEBUG, "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)
      ast_log(LOG_NOTICE, "Whoa, didn't find call!\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 = 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);
            }
         }
      } 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 = 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(dtmfnode, "dtmf", "action", "button-down")) {
                  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);
               }
            }
         }
      }
      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_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;
      if (tmp->owner)
         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->