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Last updated: Sat Feb 3 05:00:35 2007

Asterisk developer's documentation :: Codename Pineapple

---

chan_jingle.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 Jingle Channel Driver
 * 
 * \ingroup channel_drivers
 */

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

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision: 51385 $")

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

#include "asterisk/lock.h"
#include "asterisk/channel.h"
#include "asterisk/config.h"
#include "asterisk/logger.h"
#include "asterisk/module.h"
#include "asterisk/pbx.h"
#include "asterisk/options.h"
#include "asterisk/lock.h"
#include "asterisk/sched.h"
#include "asterisk/io.h"
#include "asterisk/rtp.h"
#include "asterisk/acl.h"
#include "asterisk/callerid.h"
#include "asterisk/file.h"
#include "asterisk/cli.h"
#include "asterisk/app.h"
#include "asterisk/musiconhold.h"
#include "asterisk/manager.h"
#include "asterisk/stringfields.h"
#include "asterisk/utils.h"
#include "asterisk/causes.h"
#include "asterisk/astobj.h"
#include "asterisk/abstract_jb.h"
#include "asterisk/jabber.h"
#include "asterisk/jingle.h"

#define JINGLE_CONFIG "jingle.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 = ""
};
static struct ast_jb_conf global_jbconf;

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

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

struct jingle_pvt {
   ast_mutex_t lock;                /*!< Channel private lock */
   time_t laststun;
   struct jingle *parent;           /*!< Parent client */
   char sid[100];
   char from[100];
   char ring[10];                   /*!< Message ID of ring */
   iksrule *ringrule;               /*!< Rule for matching RING request */
   int initiator;                   /*!< If we're the initiator */
   int alreadygone;
   int capability;
   struct ast_codec_pref prefs;
   struct jingle_candidate *theircandidates;
   struct jingle_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 jingle_pvt *next;   /* Next entity */
};

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

struct jingle {
   ASTOBJ_COMPONENTS(struct jingle);
   struct aji_client *connection;
   struct aji_buddy *buddy;
   struct jingle_pvt *p;
   struct ast_codec_pref prefs;
   int amaflags;        /*!< AMA Flags */
   char user[100];
   char context[100];
   char accountcode[AST_MAX_ACCOUNT_CODE];   /*!< Account code */
   int capability;
   ast_group_t callgroup;  /*!< Call group */
   ast_group_t pickupgroup;   /*!< Pickup group */
   int callingpres;     /*!< Calling presentation */
   int allowguest;
   char language[MAX_LANGUAGE];  /*!<  Default language for prompts */
   char musicclass[MAX_MUSICCLASS]; /*!<  Music on Hold class */
};

struct jingle_container {
   ASTOBJ_CONTAINER_COMPONENTS(struct jingle);
};

static const char desc[] = "Jingle Channel";
static const char type[] = "Jingle";

static int global_capability = AST_FORMAT_ULAW | AST_FORMAT_ALAW | AST_FORMAT_GSM | AST_FORMAT_H263;

AST_MUTEX_DEFINE_STATIC(jinglelock); /*!< Protect the interface list (of jingle_pvt's) */

/* Forward declarations */
static struct ast_channel *jingle_request(const char *type, int format, void *data, int *cause);
static int jingle_digit_begin(struct ast_channel *ast, char digit);
static int jingle_digit_end(struct ast_channel *ast, char digit, unsigned int duration);
static int jingle_call(struct ast_channel *ast, char *dest, int timeout);
static int jingle_hangup(struct ast_channel *ast);
static int jingle_answer(struct ast_channel *ast);
static int jingle_newcall(struct jingle *client, ikspak *pak);
static struct ast_frame *jingle_read(struct ast_channel *ast);
static int jingle_write(struct ast_channel *ast, struct ast_frame *f);
static int jingle_indicate(struct ast_channel *ast, int condition, const void *data, size_t datalen);
static int jingle_fixup(struct ast_channel *oldchan, struct ast_channel *newchan);
static int jingle_sendhtml(struct ast_channel *ast, int subclass, const char *data, int datalen);
static struct jingle_pvt *jingle_alloc(struct jingle *client, const char *from, const char *sid);
/*----- RTP interface functions */
static int jingle_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 jingle_get_rtp_peer(struct ast_channel *chan, struct ast_rtp **rtp);
static int jingle_get_codec(struct ast_channel *chan);

/*! \brief PBX interface structure for channel registration */
static const struct ast_channel_tech jingle_tech = {
   .type = type,
   .description = "Jingle Channel Driver",
   .capabilities = ((AST_FORMAT_MAX_AUDIO << 1) - 1),
   .requester = jingle_request,
   .send_digit_begin = jingle_digit_begin,
   .send_digit_end = jingle_digit_end,
   .bridge = ast_rtp_bridge,
   .call = jingle_call,
   .hangup = jingle_hangup,
   .answer = jingle_answer,
   .read = jingle_read,
   .write = jingle_write,
   .exception = jingle_read,
   .indicate = jingle_indicate,
   .fixup = jingle_fixup,
   .send_html = jingle_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 jingle_rtp = {
   type: "jingle",
   get_rtp_info: jingle_get_rtp_peer,
   set_rtp_peer: jingle_set_rtp_peer,
   get_codec: jingle_get_codec,
};

static char externip[16];

static struct jingle_container jingles;

static void jingle_member_destroy(struct jingle *obj)
{
   free(obj);
}

static struct jingle *find_jingle(char *name, char *connection)
{
   struct jingle *jingle = NULL;

   jingle = ASTOBJ_CONTAINER_FIND(&jingles, name);
   if (!jingle && strchr(name, '@'))
      jingle = ASTOBJ_CONTAINER_FIND_FULL(&jingles, name, user,,, strcasecmp);

   if (!jingle) {          /* guest call */
      ASTOBJ_CONTAINER_TRAVERSE(&jingles, 1, {
         ASTOBJ_WRLOCK(iterator);
         if (!strcasecmp(iterator->name, "guest")) {
            if (!strcasecmp(iterator->connection->jid->partial, connection)) {
               jingle = iterator;
               break;
            } else if (!strcasecmp(iterator->connection->name, connection)) {
               jingle = iterator;
               break;
            }
         }
         ASTOBJ_UNLOCK(iterator);
      });

   }
   return jingle;
}


static void add_codec_to_answer(const struct jingle_pvt *p, int codec, iks *dcodecs)
{
   char *format = ast_getformatname(codec);

   if (!strcasecmp("ulaw", format)) {
      iks *payload_eg711u, *payload_pcmu;
      payload_pcmu = iks_new("payload-type");
      iks_insert_attrib(payload_pcmu, "id", "0");
      iks_insert_attrib(payload_pcmu, "name", "PCMU");
      iks_insert_attrib(payload_pcmu, "xmlns", "http://www.google.com/session/phone");
      payload_eg711u = iks_new("payload-type");
      iks_insert_attrib(payload_eg711u, "id", "100");
      iks_insert_attrib(payload_eg711u, "name", "EG711U");
      iks_insert_attrib(payload_eg711u, "xmlns", "http://www.google.com/session/phone");
      iks_insert_node(dcodecs, payload_pcmu);
      iks_insert_node(dcodecs, payload_eg711u);
   }
   if (!strcasecmp("alaw", format)) {
      iks *payload_eg711a;
      iks *payload_pcma = iks_new("payload-type");
      iks_insert_attrib(payload_pcma, "id", "8");
      iks_insert_attrib(payload_pcma, "name", "PCMA");
      iks_insert_attrib(payload_pcma, "xmlns", "http://www.google.com/session/phone");
      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, "xmlns", "http://www.google.com/session/phone");
      iks_insert_node(dcodecs, payload_pcma);
      iks_insert_node(dcodecs, payload_eg711a);
   }
   if (!strcasecmp("ilbc", format)) {
      iks *payload_ilbc = iks_new("payload-type");
      iks_insert_attrib(payload_ilbc, "id", "102");
      iks_insert_attrib(payload_ilbc, "name", "iLBC");
      iks_insert_attrib(payload_ilbc, "xmlns", "http://www.google.com/session/phone");
      iks_insert_node(dcodecs, payload_ilbc);
   }
   if (!strcasecmp("g723", format)) {
      iks *payload_g723 = iks_new("payload-type");
      iks_insert_attrib(payload_g723, "id", "4");
      iks_insert_attrib(payload_g723, "name", "G723");
      iks_insert_attrib(payload_g723, "xmlns", "http://www.google.com/session/phone");
      iks_insert_node(dcodecs, payload_g723);
   }
   ast_rtp_lookup_code(p->rtp, 1, codec);
}

static int jingle_accept_call(struct jingle *client, struct jingle_pvt *p)
{
   struct jingle_pvt *tmp = client->p;
   struct aji_client *c = client->connection;
   iks *iq, *jingle, *dcodecs, *payload_red, *payload_audio, *payload_cn;
   int x;
   int pref_codec = 0;
   int alreadysent = 0;

   if (p->initiator)
      return 1;

   iq = iks_new("iq");
   jingle = iks_new(GOOGLE_NODE);
   dcodecs = iks_new("description");
   if (iq && jingle && dcodecs) {
      iks_insert_attrib(dcodecs, "xmlns", "http://www.google.com/session/phone");

      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;
         if (pref_codec <= AST_FORMAT_MAX_AUDIO)
            add_codec_to_answer(p, pref_codec, dcodecs);
         else
            add_codec_to_answer(p, pref_codec, dcodecs);
         alreadysent |= pref_codec;
      }
      payload_red = iks_new("payload-type");
      iks_insert_attrib(payload_red, "id", "117");
      iks_insert_attrib(payload_red, "name", "red");
      iks_insert_attrib(payload_red, "xmlns", "http://www.google.com/session/phone");
      payload_audio = iks_new("payload-type");
      iks_insert_attrib(payload_audio, "id", "106");
      iks_insert_attrib(payload_audio, "name", "audio/telephone-event");
      iks_insert_attrib(payload_audio, "xmlns", "http://www.google.com/session/phone");
      payload_cn = iks_new("payload-type");
      iks_insert_attrib(payload_cn, "id", "13");
      iks_insert_attrib(payload_cn, "name", "CN");
      iks_insert_attrib(payload_cn, "xmlns", "http://www.google.com/session/phone");


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

      iks_insert_attrib(jingle, "xmlns", "http://www.google.com/session");
      iks_insert_attrib(jingle, "type", JINGLE_ACCEPT);
      iks_insert_attrib(jingle, "initiator",
                    p->initiator ? client->connection->jid->full : p->from);
      iks_insert_attrib(jingle, GOOGLE_SID, tmp->sid);
      iks_insert_node(iq, jingle);
      iks_insert_node(jingle, dcodecs);
      iks_insert_node(dcodecs, payload_red);
      iks_insert_node(dcodecs, payload_audio);
      iks_insert_node(dcodecs, payload_cn);

      iks_send(c->p, iq);
      iks_delete(payload_red);
      iks_delete(payload_audio);
      iks_delete(payload_cn);
      iks_delete(dcodecs);
      iks_delete(jingle);
      iks_delete(iq);
   }
   return 1;
}

static int jingle_ringing_ack(void *data, ikspak *pak)
{
   struct jingle_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 jingle_answer(struct ast_channel *ast)
{
   struct jingle_pvt *p = ast->tech_pvt;
   struct jingle *client = p->parent;
   int res = 0;

   if (option_debug)
      ast_log(LOG_DEBUG, "Answer!\n");
   ast_mutex_lock(&p->lock);
   jingle_accept_call(client, p);
   ast_mutex_unlock(&p->lock);
   return res;
}

static enum ast_rtp_get_result jingle_get_rtp_peer(struct ast_channel *chan, struct ast_rtp **rtp)
{
   struct jingle_pvt *p = chan->tech_pvt;
   enum ast_rtp_get_result res = AST_RTP_GET_FAILED;

   if (!p)
      return res;

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

   return res;
}

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

static int jingle_set_rtp_peer(struct ast_channel *chan, struct ast_rtp *rtp, struct ast_rtp *vrtp, int codecs, int nat_active)
{
   struct jingle_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 jingle_response(struct jingle *client, 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", client->connection->jid->full);
      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 jingle_is_answered(struct jingle *client, ikspak *pak)
{
   struct jingle_pvt *tmp;

   if (option_debug)
      ast_log(LOG_DEBUG, "The client is %s\n", client->name);
   /* Make sure our new call doesn't exist yet */
   for (tmp = client->p; tmp; tmp = tmp->next) {
      if (iks_find_with_attrib(pak->x, GOOGLE_NODE, GOOGLE_SID, tmp->sid))
         break;
   }

   if (tmp) {
      if (tmp->owner)
         ast_queue_control(tmp->owner, AST_CONTROL_ANSWER);
   } else
      ast_log(LOG_NOTICE, "Whoa, didn't find call!\n");
   jingle_response(client, pak, NULL, NULL);
   return 1;
}

static int jingle_handle_dtmf(struct jingle *client, ikspak *pak)
{
   struct jingle_pvt *tmp;
   iks *dtmfnode = NULL;
   char *dtmf;
   /* Make sure our new call doesn't exist yet */
   for (tmp = client->p; tmp; tmp = tmp->next) {
      if (iks_find_with_attrib(pak->x, GOOGLE_NODE, GOOGLE_SID, tmp->sid))
         break;
   }

   if (tmp) {
      if(iks_find_with_attrib(pak->x, "dtmf-method", "method", "rtp")) {
         jingle_response(client,pak,
               "feature-not-implemented xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'",
               "unsupported-dtmf-method xmlns='http://jabber.org/protocol/jingle/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("JINGLE! 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("JINGLE! 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("JINGLE! DTMF-relay event received: %c\n", f.subclass);
            }
         }
      }
      jingle_response(client, pak, NULL, NULL);
      return 1;
   } else
      ast_log(LOG_NOTICE, "Whoa, didn't find call!\n");

   jingle_response(client, pak, NULL, NULL);
   return 1;
}


static int jingle_hangup_farend(struct jingle *client, ikspak *pak)
{
   struct jingle_pvt *tmp;

   if (option_debug)
      ast_log(LOG_DEBUG, "The client is %s\n", client->name);
   /* Make sure our new call doesn't exist yet */
   for (tmp = client->p; tmp; tmp = tmp->next) {
      if (iks_find_with_attrib(pak->x, GOOGLE_NODE, GOOGLE_SID, tmp->sid))
         break;
   }

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

static int jingle_create_candidates(struct jingle *client, struct jingle_pvt *p, char *sid, char *from)
{
   struct jingle_candidate *tmp;
   struct aji_client *c = client->connection;
   struct jingle_candidate *ours1 = NULL, *ours2 = NULL;
   struct sockaddr_in sin;
   struct sockaddr_in dest;
   struct in_addr us;
   iks *iq, *jingle, *candidate;
   char user[17], pass[17], preference[5], port[7];


   iq = iks_new("iq");
   jingle = iks_new(GOOGLE_NODE);
   candidate = iks_new("candidate");
   if (!iq || !jingle || !candidate) {
      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_node(iq, jingle);
   iks_insert_node(jingle, candidate);

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

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

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

   /* Setup our jingle 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", c->jid->full);
      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(jingle, "type", "candidates");
      iks_insert_attrib(jingle, "id", sid);
      iks_insert_attrib(jingle, "initiator", (p->initiator) ? c->jid->full : from);
      iks_insert_attrib(jingle, "xmlns", GOOGLE_NS);
      iks_insert_attrib(candidate, "name", tmp->name);
      iks_insert_attrib(candidate, "address", tmp->ip);
      iks_insert_attrib(candidate, "port", port);
      iks_insert_attrib(candidate, "username", tmp->username);
      iks_insert_attrib(candidate, "password", tmp->password);
      iks_insert_attrib(candidate, "preference", preference);
      if (tmp->protocol == AJI_PROTOCOL_UDP)
         iks_insert_attrib(candidate, "protocol", "udp");
      if (tmp->protocol == AJI_PROTOCOL_SSLTCP)
         iks_insert_attrib(candidate, "protocol", "ssltcp");
      if (tmp->type == AJI_CONNECT_STUN)
         iks_insert_attrib(candidate, "type", "stun");
      if (tmp->type == AJI_CONNECT_LOCAL)
         iks_insert_attrib(candidate, "type", "local");
      if (tmp->type == AJI_CONNECT_RELAY)
         iks_insert_attrib(candidate, "type", "relay");
      iks_insert_attrib(candidate, "network", "0");
      iks_insert_attrib(candidate, "generation", "0");
      iks_send(c->p, iq);
   }
   p->laststun = 0;

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

static struct jingle_pvt *jingle_alloc(struct jingle *client, const char *from, const char *sid)
{
   struct jingle_pvt *tmp = NULL;
   struct aji_resource *resources = NULL;
   struct aji_buddy *buddy;
   char idroster[200];

   if (option_debug)
      ast_log(LOG_DEBUG, "The client is %s for alloc\n", client->name);
   if (!sid && !strchr(from, '/')) {   /* I started call! */
      if (!strcasecmp(client->name, "guest")) {
         buddy = ASTOBJ_CONTAINER_FIND(&client->connection->buddies, from);
         if (buddy)
            resources = buddy->resources;
      } else 
         resources = client->buddy->resources;
      while (resources) {
         if (resources->cap->jingle) {
            break;
         }
         resources = resources->next;
      }
      if (resources)
         snprintf(idroster, sizeof(idroster), "%s/%s", from, resources->resource);
      else {
         ast_log(LOG_ERROR, "no jingle capable clients to talk to.\n");
         return NULL;
      }
   }
   if (!(tmp = ast_calloc(1, sizeof(*tmp)))) {
      return NULL;
   }
   if (sid) {
      ast_copy_string(tmp->sid, sid, sizeof(tmp->sid));
      ast_copy_string(tmp->from, from, sizeof(tmp->from));
   } else {
      snprintf(tmp->sid, sizeof(tmp->sid), "%08lx%08lx", ast_random(), ast_random());
      ast_copy_string(tmp->from, idroster, sizeof(tmp->from));
      tmp->initiator = 1;
   }
   tmp->rtp = ast_rtp_new_with_bindaddr(sched, io, 1, 0, bindaddr.sin_addr);
   tmp->parent = client;
   if (!tmp->rtp) {
      ast_log(LOG_WARNING, "Out of RTP sessions?\n");
      free(tmp);
      return NULL;
   }
   ast_copy_string(tmp->exten, "s", sizeof(tmp->exten));
   ast_mutex_init(&tmp->lock);
   ast_mutex_lock(&jinglelock);
   tmp->next = client->p;
   client->p = tmp;
   ast_mutex_unlock(&jinglelock);
   return tmp;
}

/*! \brief Start new jingle channel */
static struct ast_channel *jingle_new(struct jingle *client, struct jingle_pvt *i, int state, const char *title)
{
   struct ast_channel *tmp;
   int fmt;
   int what;
   const char *str;

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

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

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

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

   return tmp;
}

static int jingle_action(struct jingle *client, struct jingle_pvt *p, const char *action)
{
   iks *request, *session = NULL;
   int res = -1;

   request = iks_new("iq");
   if (request) {
      iks_insert_attrib(request, "type", "set");
      iks_insert_attrib(request, "from", client->connection