src/core/sipe-media.c

   1 /**
   2  * @file sipe-media.c
   3  *
   4  * pidgin-sipe
   5  *
   6  * Copyright (C) 2011-12 SIPE Project <http://sipe.sourceforge.net/>
   7  * Copyright (C) 2010 Jakub Adam <jakub.adam@ktknet.cz>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include "config.h"
  26 #endif
  27
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31
  32 #include <glib.h>
  33
  34 #include "sipe-common.h"
  35 #include "sipmsg.h"
  36 #include "sip-transport.h"
  37 #include "sipe-backend.h"
  38 #include "sdpmsg.h"
  39 #include "sipe-chat.h"
  40 #include "sipe-core.h"
  41 #include "sipe-core-private.h"
  42 #include "sipe-dialog.h"
  43 #include "sipe-media.h"
  44 #include "sipe-ocs2007.h"
  45 #include "sipe-session.h"
  46 #include "sipe-utils.h"
  47 #include "sipe-nls.h"
  48 #include "sipe-schedule.h"
  49 #include "sipe-xml.h"
  50
  51 struct sipe_media_call_private {
  52         struct sipe_media_call public;
  53
  54         /* private part starts here */
  55         struct sipe_core_private        *sipe_private;
  56         gchar                           *with;
  57
  58         struct sipmsg                   *invitation;
  59         SipeIceVersion                   ice_version;
  60         gboolean                         encryption_compatible;
  61
  62         struct sdpmsg                   *smsg;
  63         GSList                          *failed_media;
  64 };
  65 #define SIPE_MEDIA_CALL         ((struct sipe_media_call *) call_private)
  66 #define SIPE_MEDIA_CALL_PRIVATE ((struct sipe_media_call_private *) call)
  67
  68 static void sipe_media_codec_list_free(GList *codecs)
  69 {
  70         for (; codecs; codecs = g_list_delete_link(codecs, codecs))
  71                 sipe_backend_codec_free(codecs->data);
  72 }
  73
  74 static void sipe_media_candidate_list_free(GList *candidates)
  75 {
  76         for (; candidates; candidates = g_list_delete_link(candidates, candidates))
  77                 sipe_backend_candidate_free(candidates->data);
  78 }
  79
  80 static void
  81 sipe_media_call_free(struct sipe_media_call_private *call_private)
  82 {
  83         if (call_private) {
  84                 struct sip_session *session;
  85                 sipe_backend_media_free(call_private->public.backend_private);
  86
  87                 session = sipe_session_find_call(call_private->sipe_private,
  88                                                  call_private->with);
  89                 if (session)
  90                         sipe_session_remove(call_private->sipe_private, session);
  91
  92                 if (call_private->invitation)
  93                         sipmsg_free(call_private->invitation);
  94
  95                 sdpmsg_free(call_private->smsg);
  96                 g_slist_free_full(call_private->failed_media,
  97                                   (GDestroyNotify)sdpmedia_free);
  98                 g_free(call_private->with);
  99                 g_free(call_private);
 100         }
 101 }
 102
 103 static GSList *
 104 backend_candidates_to_sdpcandidate(GList *candidates)
 105 {
 106         GSList *result = NULL;
 107         GList *i;
 108
 109         for (i = candidates; i; i = i->next) {
 110                 struct sipe_backend_candidate *candidate = i->data;
 111                 struct sdpcandidate *c = g_new(struct sdpcandidate, 1);
 112
 113                 c->foundation = sipe_backend_candidate_get_foundation(candidate);
 114                 c->component = sipe_backend_candidate_get_component_type(candidate);
 115                 c->type = sipe_backend_candidate_get_type(candidate);
 116                 c->protocol = sipe_backend_candidate_get_protocol(candidate);
 117                 c->ip = sipe_backend_candidate_get_ip(candidate);
 118                 c->port = sipe_backend_candidate_get_port(candidate);
 119                 c->base_ip = sipe_backend_candidate_get_base_ip(candidate);
 120                 c->base_port = sipe_backend_candidate_get_base_port(candidate);
 121                 c->priority = sipe_backend_candidate_get_priority(candidate);
 122                 c->username = sipe_backend_candidate_get_username(candidate);
 123                 c->password = sipe_backend_candidate_get_password(candidate);
 124
 125                 result = g_slist_append(result, c);
 126         }
 127
 128         return result;
 129 }
 130
 131 static void
 132 get_stream_ip_and_ports(GSList *candidates,
 133                         gchar **ip, guint *rtp_port, guint *rtcp_port,
 134                         SipeCandidateType type)
 135 {
 136         *rtp_port = 0;
 137         *rtcp_port = 0;
 138
 139         for (; candidates; candidates = candidates->next) {
 140                 struct sdpcandidate *candidate = candidates->data;
 141
 142                 if (type == SIPE_CANDIDATE_TYPE_ANY || candidate->type == type) {
 143                         if (candidate->component == SIPE_COMPONENT_RTP) {
 144                                 *rtp_port = candidate->port;
 145                                 *ip = g_strdup(candidate->ip);
 146                         } else if (candidate->component == SIPE_COMPONENT_RTCP)
 147                                 *rtcp_port = candidate->port;
 148                 }
 149
 150                 if (*rtp_port != 0 && *rtcp_port != 0)
 151                         return;
 152         }
 153 }
 154
 155 static struct sdpmedia *
 156 backend_stream_to_sdpmedia(struct sipe_backend_media *backend_media,
 157                            struct sipe_backend_stream *backend_stream)
 158 {
 159         struct sdpmedia *media = g_new0(struct sdpmedia, 1);
 160         GList *codecs = sipe_backend_get_local_codecs(backend_media,
 161                                                       backend_stream);
 162         guint rtcp_port = 0;
 163         SipeMediaType type;
 164         GSList *attributes = NULL;
 165         GList *candidates;
 166         GList *i;
 167
 168         media->name = g_strdup(sipe_backend_stream_get_id(backend_stream));
 169
 170         if (sipe_strequal(media->name, "audio"))
 171                 type = SIPE_MEDIA_AUDIO;
 172         else if (sipe_strequal(media->name, "video"))
 173                 type = SIPE_MEDIA_VIDEO;
 174         else {
 175                 // TODO: incompatible media, should not happen here
 176                 g_free(media->name);
 177                 g_free(media);
 178                 sipe_media_codec_list_free(codecs);
 179                 return(NULL);
 180         }
 181
 182         // Process codecs
 183         for (i = codecs; i; i = i->next) {
 184                 struct sipe_backend_codec *codec = i->data;
 185                 struct sdpcodec *c = g_new0(struct sdpcodec, 1);
 186                 GList *params;
 187
 188                 c->id = sipe_backend_codec_get_id(codec);
 189                 c->name = sipe_backend_codec_get_name(codec);
 190                 c->clock_rate = sipe_backend_codec_get_clock_rate(codec);
 191                 c->type = type;
 192
 193                 params = sipe_backend_codec_get_optional_parameters(codec);
 194                 for (; params; params = params->next) {
 195                         struct sipnameval *param = params->data;
 196                         struct sipnameval *copy = g_new0(struct sipnameval, 1);
 197
 198                         copy->name = g_strdup(param->name);
 199                         copy->value = g_strdup(param->value);
 200
 201                         c->parameters = g_slist_append(c->parameters, copy);
 202                 }
 203
 204                 media->codecs = g_slist_append(media->codecs, c);
 205         }
 206
 207         sipe_media_codec_list_free(codecs);
 208
 209         // Process local candidates
 210         // If we have established candidate pairs, send them in SDP response.
 211         // Otherwise send all available local candidates.
 212         candidates = sipe_backend_media_get_active_local_candidates(backend_media,
 213                                                                     backend_stream);
 214         if (!candidates)
 215                 candidates = sipe_backend_get_local_candidates(backend_media,
 216                                                                backend_stream);
 217
 218         media->candidates = backend_candidates_to_sdpcandidate(candidates);
 219
 220         sipe_media_candidate_list_free(candidates);
 221
 222         get_stream_ip_and_ports(media->candidates, &media->ip, &media->port,
 223                                 &rtcp_port, SIPE_CANDIDATE_TYPE_HOST);
 224         // No usable HOST candidates, use any candidate
 225         if (media->ip == NULL && media->candidates) {
 226                 get_stream_ip_and_ports(media->candidates, &media->ip, &media->port,
 227                                         &rtcp_port, SIPE_CANDIDATE_TYPE_ANY);
 228         }
 229
 230         if (sipe_backend_stream_is_held(backend_stream))
 231                 attributes = sipe_utils_nameval_add(attributes, "inactive", "");
 232
 233         if (rtcp_port) {
 234                 gchar *tmp = g_strdup_printf("%u", rtcp_port);
 235                 attributes  = sipe_utils_nameval_add(attributes, "rtcp", tmp);
 236                 g_free(tmp);
 237         }
 238
 239         attributes = sipe_utils_nameval_add(attributes, "encryption", "rejected");
 240
 241         media->attributes = attributes;
 242
 243         // Process remote candidates
 244         candidates = sipe_backend_media_get_active_remote_candidates(backend_media,
 245                                                                      backend_stream);
 246         media->remote_candidates = backend_candidates_to_sdpcandidate(candidates);
 247         sipe_media_candidate_list_free(candidates);
 248
 249         return media;
 250 }
 251
 252 static struct sdpmsg *
 253 sipe_media_to_sdpmsg(struct sipe_media_call_private *call_private)
 254 {
 255         struct sipe_backend_media *backend_media = call_private->public.backend_private;
 256         struct sdpmsg *msg = g_new0(struct sdpmsg, 1);
 257         GSList *streams = sipe_backend_media_get_streams(backend_media);
 258
 259         for (; streams; streams = streams->next) {
 260                 struct sdpmedia *media = backend_stream_to_sdpmedia(backend_media, streams->data);
 261                 if (media) {
 262                         msg->media = g_slist_append(msg->media, media);
 263
 264                         if (msg->ip == NULL)
 265                                 msg->ip = g_strdup(media->ip);
 266                 }
 267         }
 268
 269         msg->media = g_slist_concat(msg->media, call_private->failed_media);
 270         call_private->failed_media = NULL;
 271
 272         msg->ice_version = call_private->ice_version;
 273
 274         return msg;
 275 }
 276
 277 static void
 278 sipe_invite_call(struct sipe_core_private *sipe_private, TransCallback tc)
 279 {
 280         gchar *hdr;
 281         gchar *contact;
 282         gchar *body;
 283         struct sipe_media_call_private *call_private = sipe_private->media_call;
 284         struct sip_session *session;
 285         struct sip_dialog *dialog;
 286         struct sdpmsg *msg;
 287         gboolean add_2007_fallback = FALSE;
 288
 289         session = sipe_session_find_call(sipe_private, call_private->with);
 290         dialog = session->dialogs->data;
 291         add_2007_fallback = dialog->cseq == 0 && call_private->ice_version == SIPE_ICE_RFC_5245;
 292
 293         contact = get_contact(sipe_private);
 294         hdr = g_strdup_printf(
 295                 "ms-keep-alive: UAC;hop-hop=yes\r\n"
 296                 "Contact: %s\r\n"
 297                 "Content-Type: %s\r\n",
 298                 contact,
 299                 add_2007_fallback ?
 300                           "multipart/alternative;boundary=\"----=_NextPart_000_001E_01CB4397.0B5EB570\""
 301                         : "application/sdp");
 302         g_free(contact);
 303
 304         msg = sipe_media_to_sdpmsg(call_private);
 305         body = sdpmsg_to_string(msg);
 306
 307         if (add_2007_fallback) {
 308                 gchar *tmp;
 309                 tmp = g_strdup_printf(
 310                         "------=_NextPart_000_001E_01CB4397.0B5EB570\r\n"
 311                         "Content-Type: application/sdp\r\n"
 312                         "Content-Transfer-Encoding: 7bit\r\n"
 313                         "Content-Disposition: session; handling=optional; ms-proxy-2007fallback\r\n"
 314                         "\r\n"
 315                         "o=- 0 0 IN IP4 %s\r\n"
 316                         "s=session\r\n"
 317                         "c=IN IP4 %s\r\n"
 318                         "m=audio 0 RTP/AVP\r\n"
 319                         "\r\n"
 320                         "------=_NextPart_000_001E_01CB4397.0B5EB570\r\n"
 321                         "Content-Type: application/sdp\r\n"
 322                         "Content-Transfer-Encoding: 7bit\r\n"
 323                         "Content-Disposition: session; handling=optional\r\n"
 324                         "\r\n"
 325                         "%s"
 326                         "\r\n"
 327                         "------=_NextPart_000_001E_01CB4397.0B5EB570--\r\n",
 328                         msg->ip, msg->ip, body);
 329                 g_free(body);
 330                 body = tmp;
 331         }
 332
 333         sdpmsg_free(msg);
 334
 335         dialog->outgoing_invite = sip_transport_invite(sipe_private,
 336                                                        hdr,
 337                                                        body,
 338                                                        dialog,
 339                                                        tc);
 340
 341         g_free(body);
 342         g_free(hdr);
 343 }
 344
 345 static struct sip_dialog *
 346 sipe_media_dialog_init(struct sip_session* session, struct sipmsg *msg)
 347 {
 348         gchar *newTag = gentag();
 349         const gchar *oldHeader;
 350         gchar *newHeader;
 351         struct sip_dialog *dialog;
 352
 353         oldHeader = sipmsg_find_header(msg, "To");
 354         newHeader = g_strdup_printf("%s;tag=%s", oldHeader, newTag);
 355         sipmsg_remove_header_now(msg, "To");
 356         sipmsg_add_header_now(msg, "To", newHeader);
 357         g_free(newHeader);
 358
 359         dialog = sipe_dialog_add(session);
 360         dialog->callid = g_strdup(sipmsg_find_header(msg, "Call-ID"));
 361         dialog->with = parse_from(sipmsg_find_header(msg, "From"));
 362         sipe_dialog_parse(dialog, msg, FALSE);
 363
 364         return dialog;
 365 }
 366
 367 static void
 368 send_response_with_session_description(struct sipe_media_call_private *call_private, int code, gchar *text)
 369 {
 370         struct sdpmsg *msg = sipe_media_to_sdpmsg(call_private);
 371         gchar *body = sdpmsg_to_string(msg);
 372         sdpmsg_free(msg);
 373         sipmsg_add_header(call_private->invitation, "Content-Type", "application/sdp");
 374         sip_transport_response(call_private->sipe_private, call_private->invitation, code, text, body);
 375         g_free(body);
 376 }
 377
 378 static gboolean
 379 encryption_levels_compatible(struct sdpmsg *msg)
 380 {
 381         GSList *i;
 382
 383         for (i = msg->media; i; i = i->next) {
 384                 const gchar *enc_level;
 385                 struct sdpmedia *m = i->data;
 386
 387                 enc_level = sipe_utils_nameval_find(m->attributes, "encryption");
 388
 389                 // Decline call if peer requires encryption as we don't support it yet.
 390                 if (sipe_strequal(enc_level, "required"))
 391                         return FALSE;
 392         }
 393
 394         return TRUE;
 395 }
 396
 397 static gboolean
 398 process_invite_call_response(struct sipe_core_private *sipe_private,
 399                                                                    struct sipmsg *msg,
 400                                                                    struct transaction *trans);
 401
 402 static gboolean
 403 update_remote_media(struct sipe_media_call_private* call_private,
 404                     struct sdpmedia *media)
 405 {
 406         struct sipe_backend_media *backend_media = SIPE_MEDIA_CALL->backend_private;
 407         struct sipe_backend_stream *backend_stream;
 408         GList *backend_candidates = NULL;
 409         GList *backend_codecs = NULL;
 410         GSList *i;
 411         gboolean result = TRUE;
 412
 413         backend_stream = sipe_backend_media_get_stream_by_id(backend_media,
 414                                                              media->name);
 415         if (media->port == 0) {
 416                 if (backend_stream)
 417                         sipe_backend_media_remove_stream(backend_media, backend_stream);
 418                 return TRUE;
 419         }
 420
 421         if (!backend_stream)
 422                 return FALSE;
 423
 424         for (i = media->codecs; i; i = i->next) {
 425                 struct sdpcodec *c = i->data;
 426                 struct sipe_backend_codec *codec;
 427                 GSList *j;
 428
 429                 codec = sipe_backend_codec_new(c->id,
 430                                                c->name,
 431                                                c->type,
 432                                                c->clock_rate);
 433
 434                 for (j = c->parameters; j; j = j->next) {
 435                         struct sipnameval *attr = j->data;
 436
 437                         sipe_backend_codec_add_optional_parameter(codec,
 438                                                                   attr->name,
 439                                                                   attr->value);
 440                 }
 441
 442                 backend_codecs = g_list_append(backend_codecs, codec);
 443         }
 444
 445         result = sipe_backend_set_remote_codecs(backend_media,
 446                                                 backend_stream,
 447                                                 backend_codecs);
 448         sipe_media_codec_list_free(backend_codecs);
 449
 450         if (result == FALSE) {
 451                 sipe_backend_media_remove_stream(backend_media, backend_stream);
 452                 return FALSE;
 453         }
 454
 455         for (i = media->candidates; i; i = i->next) {
 456                 struct sdpcandidate *c = i->data;
 457                 struct sipe_backend_candidate *candidate;
 458                 candidate = sipe_backend_candidate_new(c->foundation,
 459                                                        c->component,
 460                                                        c->type,
 461                                                        c->protocol,
 462                                                        c->ip,
 463                                                        c->port,
 464                                                        c->username,
 465                                                        c->password);
 466                 sipe_backend_candidate_set_priority(candidate, c->priority);
 467
 468                 backend_candidates = g_list_append(backend_candidates, candidate);
 469         }
 470
 471         sipe_backend_media_add_remote_candidates(backend_media,
 472                                                  backend_stream,
 473                                                  backend_candidates);
 474         sipe_media_candidate_list_free(backend_candidates);
 475
 476         if (sipe_utils_nameval_find(media->attributes, "inactive")) {
 477                 sipe_backend_stream_hold(backend_media, backend_stream, FALSE);
 478         } else if (sipe_backend_stream_is_held(backend_stream)) {
 479                 sipe_backend_stream_unhold(backend_media, backend_stream, FALSE);
 480         }
 481
 482         return TRUE;
 483 }
 484
 485 static void
 486 apply_remote_message(struct sipe_media_call_private* call_private,
 487                      struct sdpmsg* msg)
 488 {
 489         GSList *i;
 490
 491         g_slist_free_full(call_private->failed_media, (GDestroyNotify)sdpmedia_free);
 492         call_private->failed_media = NULL;
 493
 494         for (i = msg->media; i; i = i->next) {
 495                 struct sdpmedia *media = i->data;
 496                 if (!update_remote_media(call_private, media)) {
 497                         media->port = 0;
 498                         call_private->failed_media =
 499                                 g_slist_append(call_private->failed_media, media);
 500                 }
 501         }
 502
 503         /* We need to keep failed medias until response is sent, remove them
 504          * from sdpmsg that is to be freed. */
 505         for (i = call_private->failed_media; i; i = i->next) {
 506                 msg->media = g_slist_remove(msg->media, i->data);
 507         }
 508
 509         call_private->encryption_compatible = encryption_levels_compatible(msg);
 510 }
 511
 512 // Sends an invite response when the call is accepted and local candidates were
 513 // prepared, otherwise does nothing. If error response is sent, call_private is
 514 // disposed before function returns. Returns true when response was sent.
 515 static gboolean
 516 send_invite_response_if_ready(struct sipe_media_call_private *call_private)
 517 {
 518         struct sipe_backend_media *backend_media;
 519
 520         backend_media = call_private->public.backend_private;
 521
 522         if (!sipe_backend_media_accepted(backend_media) ||
 523             !sipe_backend_candidates_prepared(backend_media))
 524                 return FALSE;
 525
 526         if (!call_private->encryption_compatible) {
 527                 struct sipe_core_private *sipe_private = call_private->sipe_private;
 528
 529                 sipmsg_add_header(call_private->invitation, "Warning",
 530                         "308 lcs.microsoft.com \"Encryption Levels not compatible\"");
 531                 sip_transport_response(sipe_private,
 532                         call_private->invitation,
 533                         488, "Encryption Levels not compatible",
 534                         NULL);
 535                 sipe_backend_media_reject(backend_media, FALSE);
 536                 sipe_backend_notify_error(SIPE_CORE_PUBLIC,
 537                                           _("Unable to establish a call"),
 538                                           _("Encryption settings of peer are incompatible with ours."));
 539         } else {
 540                 send_response_with_session_description(call_private, 200, "OK");
 541         }
 542
 543         return TRUE;
 544 }
 545
 546 static void
 547 candidates_prepared_cb(struct sipe_media_call *call,
 548                        struct sipe_backend_stream *stream)
 549 {
 550         struct sipe_media_call_private *call_private = SIPE_MEDIA_CALL_PRIVATE;
 551         struct sipe_backend_media *backend_private = call->backend_private;
 552
 553         if (sipe_backend_media_is_initiator(backend_private, stream)) {
 554                 sipe_invite_call(call_private->sipe_private,
 555                                  process_invite_call_response);
 556         } else {
 557                 struct sdpmsg *smsg = call_private->smsg;
 558                 call_private->smsg = NULL;
 559
 560                 apply_remote_message(call_private, smsg);
 561                 send_invite_response_if_ready(call_private);
 562                 sdpmsg_free(smsg);
 563         }
 564 }
 565
 566 static void phone_state_publish(struct sipe_core_private *sipe_private)
 567 {
 568         if (SIPE_CORE_PRIVATE_FLAG_IS(OCS2007)) {
 569                 sipe_ocs2007_phone_state_publish(sipe_private);
 570         } else {
 571                 // TODO: OCS 2005 support. Is anyone still using it at all?
 572         }
 573 }
 574
 575 static void
 576 media_end_cb(struct sipe_media_call *call)
 577 {
 578         g_return_if_fail(call);
 579
 580         SIPE_MEDIA_CALL_PRIVATE->sipe_private->media_call = NULL;
 581         phone_state_publish(SIPE_MEDIA_CALL_PRIVATE->sipe_private);
 582         sipe_media_call_free(SIPE_MEDIA_CALL_PRIVATE);
 583 }
 584
 585 static void
 586 call_accept_cb(struct sipe_media_call *call, gboolean local)
 587 {
 588         if (local) {
 589                 send_invite_response_if_ready(SIPE_MEDIA_CALL_PRIVATE);
 590         }
 591         phone_state_publish(SIPE_MEDIA_CALL_PRIVATE->sipe_private);
 592 }
 593
 594 static void
 595 call_reject_cb(struct sipe_media_call *call, gboolean local)
 596 {
 597         if (local) {
 598                 struct sipe_media_call_private *call_private = SIPE_MEDIA_CALL_PRIVATE;
 599                 sip_transport_response(call_private->sipe_private,
 600                                        call_private->invitation,
 601                                        603, "Decline", NULL);
 602         }
 603 }
 604
 605 static gboolean
 606 sipe_media_send_ack(struct sipe_core_private *sipe_private, struct sipmsg *msg,
 607                                         struct transaction *trans);
 608
 609 static void call_hold_cb(struct sipe_media_call *call,
 610                          gboolean local,
 611                          SIPE_UNUSED_PARAMETER gboolean state)
 612 {
 613         if (local)
 614                 sipe_invite_call(SIPE_MEDIA_CALL_PRIVATE->sipe_private,
 615                                  sipe_media_send_ack);
 616 }
 617
 618 static void call_hangup_cb(struct sipe_media_call *call, gboolean local)
 619 {
 620         if (local) {
 621                 struct sipe_media_call_private *call_private = SIPE_MEDIA_CALL_PRIVATE;
 622                 struct sip_session *session;
 623                 session = sipe_session_find_call(call_private->sipe_private,
 624                                                  call_private->with);
 625
 626                 if (session) {
 627                         sipe_session_close(call_private->sipe_private, session);
 628                 }
 629         }
 630 }
 631
 632 static void
 633 error_cb(struct sipe_media_call *call, gchar *message)
 634 {
 635         struct sipe_media_call_private *call_private = SIPE_MEDIA_CALL_PRIVATE;
 636         struct sipe_core_private *sipe_private = call_private->sipe_private;
 637         gboolean initiator = sipe_backend_media_is_initiator(call->backend_private, NULL);
 638         gboolean accepted = sipe_backend_media_accepted(call->backend_private);
 639
 640         gchar *title = g_strdup_printf("Call with %s failed", call_private->with);
 641         sipe_backend_notify_error(SIPE_CORE_PUBLIC, title, message);
 642         g_free(title);
 643
 644         if (!initiator && !accepted) {
 645                 sip_transport_response(sipe_private,
 646                                        call_private->invitation,
 647                                        488, "Not Acceptable Here", NULL);
 648         }
 649
 650         sipe_backend_media_hangup(call->backend_private, initiator || accepted);
 651 }
 652
 653 static struct sipe_media_call_private *
 654 sipe_media_call_new(struct sipe_core_private *sipe_private,
 655                     const gchar* with, gboolean initiator, SipeIceVersion ice_version)
 656 {
 657         struct sipe_media_call_private *call_private = g_new0(struct sipe_media_call_private, 1);
 658         gchar *cname;
 659
 660         call_private->sipe_private = sipe_private;
 661
 662         cname = g_strdup(sipe_private->contact + 1);
 663         cname[strlen(cname) - 1] = '\0';
 664
 665         call_private->public.backend_private = sipe_backend_media_new(SIPE_CORE_PUBLIC,
 666                                                                       SIPE_MEDIA_CALL,
 667                                                                       with,
 668                                                                       initiator);
 669         sipe_backend_media_set_cname(call_private->public.backend_private, cname);
 670
 671         call_private->ice_version = ice_version;
 672         call_private->encryption_compatible = TRUE;
 673
 674         call_private->public.candidates_prepared_cb = candidates_prepared_cb;
 675         call_private->public.media_end_cb           = media_end_cb;
 676         call_private->public.call_accept_cb         = call_accept_cb;
 677         call_private->public.call_reject_cb         = call_reject_cb;
 678         call_private->public.call_hold_cb           = call_hold_cb;
 679         call_private->public.call_hangup_cb         = call_hangup_cb;
 680         call_private->public.error_cb               = error_cb;
 681
 682         g_free(cname);
 683
 684         return call_private;
 685 }
 686
 687 void sipe_media_hangup(struct sipe_media_call_private *call_private)
 688 {
 689         if (call_private) {
 690                 sipe_backend_media_hangup(call_private->public.backend_private,
 691                                           FALSE);
 692         }
 693 }
 694
 695 static void
 696 sipe_media_initiate_call(struct sipe_core_private *sipe_private,
 697                          const char *with, SipeIceVersion ice_version,
 698                          gboolean with_video)
 699 {
 700         struct sipe_media_call_private *call_private;
 701         struct sipe_backend_media *backend_media;
 702         struct sipe_backend_media_relays *backend_media_relays;
 703         struct sip_session *session;
 704         struct sip_dialog *dialog;
 705
 706         if (sipe_private->media_call)
 707                 return;
 708
 709         call_private = sipe_media_call_new(sipe_private, with, TRUE, ice_version);
 710
 711         session = sipe_session_add_call(sipe_private, with);
 712         dialog = sipe_dialog_add(session);
 713         dialog->callid = gencallid();
 714         dialog->with = g_strdup(session->with);
 715         dialog->ourtag = gentag();
 716
 717         call_private->with = g_strdup(session->with);
 718
 719         backend_media = call_private->public.backend_private;
 720
 721         backend_media_relays =
 722                 sipe_backend_media_relays_convert(sipe_private->media_relays,
 723                                                   sipe_private->media_relay_username,
 724                                                   sipe_private->media_relay_password);
 725
 726         if (!sipe_backend_media_add_stream(backend_media,
 727                                            "audio", with, SIPE_MEDIA_AUDIO,
 728                                            call_private->ice_version, TRUE,
 729                                            backend_media_relays)) {
 730                 sipe_backend_notify_error(SIPE_CORE_PUBLIC,
 731                                           _("Error occured"),
 732                                           _("Error creating audio stream"));
 733                 sipe_media_call_free(call_private);
 734                 sipe_backend_media_relays_free(backend_media_relays);
 735                 return;
 736         }
 737
 738         if (   with_video
 739             && !sipe_backend_media_add_stream(backend_media,
 740                                               "video", with, SIPE_MEDIA_VIDEO,
 741                                               call_private->ice_version, TRUE,
 742                                               backend_media_relays)) {
 743                 sipe_backend_notify_error(SIPE_CORE_PUBLIC,
 744                                           _("Error occured"),
 745                                           _("Error creating video stream"));
 746                 sipe_media_call_free(call_private);
 747                 sipe_backend_media_relays_free(backend_media_relays);
 748                 return;
 749         }
 750
 751         sipe_private->media_call = call_private;
 752
 753         sipe_backend_media_relays_free(backend_media_relays);
 754
 755         // Processing continues in candidates_prepared_cb
 756 }
 757
 758 void
 759 sipe_core_media_initiate_call(struct sipe_core_public *sipe_public,
 760                               const char *with,
 761                               gboolean with_video)
 762 {
 763         sipe_media_initiate_call(SIPE_CORE_PRIVATE, with,
 764                                  SIPE_ICE_RFC_5245, with_video);
 765 }
 766
 767 void sipe_core_media_connect_conference(struct sipe_core_public *sipe_public,
 768                                         struct sipe_chat_session *chat_session)
 769 {
 770         struct sipe_core_private *sipe_private = SIPE_CORE_PRIVATE;
 771         struct sipe_backend_media_relays *backend_media_relays;
 772         struct sip_session *session;
 773         struct sip_dialog *dialog;
 774         gchar **parts;
 775         gchar *av_uri;
 776
 777         session = sipe_session_find_chat(sipe_private, chat_session);
 778
 779         if (sipe_private->media_call || !session)
 780                 return;
 781
 782         session->is_call = TRUE;
 783
 784         parts = g_strsplit(chat_session->id, "app:conf:focus:", 2);
 785         av_uri = g_strjoinv("app:conf:audio-video:", parts);
 786         g_strfreev(parts);
 787
 788         sipe_private->media_call = sipe_media_call_new(sipe_private, av_uri,
 789                                                        TRUE, SIPE_ICE_DRAFT_6);
 790
 791         session = sipe_session_add_call(sipe_private, av_uri);
 792         dialog = sipe_dialog_add(session);
 793         dialog->callid = gencallid();
 794         dialog->with = g_strdup(session->with);
 795         dialog->ourtag = gentag();
 796
 797         g_free(av_uri);
 798
 799         sipe_private->media_call->with = g_strdup(session->with);
 800         sipe_private->media_call->ice_version = SIPE_ICE_DRAFT_6;
 801
 802         backend_media_relays =
 803                 sipe_backend_media_relays_convert(sipe_private->media_relays,
 804                                                   sipe_private->media_relay_username,
 805                                                   sipe_private->media_relay_password);
 806
 807         if (!sipe_backend_media_add_stream(sipe_private->media_call->public.backend_private,
 808                                            "audio", dialog->with,
 809                                            SIPE_MEDIA_AUDIO,
 810                                            SIPE_ICE_DRAFT_6, TRUE,
 811                                            backend_media_relays)) {
 812                 sipe_backend_notify_error(sipe_public,
 813                                           _("Error occured"),
 814                                           _("Error creating audio stream"));
 815                 sipe_media_call_free(sipe_private->media_call);
 816                 sipe_private->media_call = NULL;
 817         }
 818
 819         sipe_backend_media_relays_free(backend_media_relays);
 820
 821         // Processing continues in candidates_prepared_cb
 822 }
 823
 824 gboolean sipe_core_media_in_call(struct sipe_core_public *sipe_public)
 825 {
 826         if (sipe_public) {
 827                 return SIPE_CORE_PRIVATE->media_call != NULL;
 828         }
 829         return FALSE;
 830 }
 831
 832 void sipe_core_media_test_call(struct sipe_core_public *sipe_public)
 833 {
 834         struct sipe_core_private *sipe_private = SIPE_CORE_PRIVATE;
 835         if (!sipe_private->test_call_bot_uri) {
 836                 sipe_backend_notify_error(sipe_public,
 837                                           _("Unable to establish a call"),
 838                                           _("Audio Test Service is not available."));
 839                 return;
 840         }
 841
 842         sipe_core_media_initiate_call(sipe_public,
 843                                       sipe_private->test_call_bot_uri, FALSE);
 844 }
 845
 846 void
 847 process_incoming_invite_call(struct sipe_core_private *sipe_private,
 848                              struct sipmsg *msg)
 849 {
 850         struct sipe_media_call_private *call_private = sipe_private->media_call;
 851         struct sipe_backend_media *backend_media;
 852         struct sipe_backend_media_relays *backend_media_relays = NULL;
 853         struct sdpmsg *smsg;
 854         gboolean has_new_media = FALSE;
 855         GSList *i;
 856
 857         if (call_private && !is_media_session_msg(call_private, msg)) {
 858                 sip_transport_response(sipe_private, msg, 486, "Busy Here", NULL);
 859                 return;
 860         }
 861
 862         smsg = sdpmsg_parse_msg(msg->body);
 863         if (!smsg) {
 864                 sip_transport_response(sipe_private, msg,
 865                                        488, "Not Acceptable Here", NULL);
 866                 sipe_media_hangup(call_private);
 867                 return;
 868         }
 869
 870         if (!call_private) {
 871                 gchar *with = parse_from(sipmsg_find_header(msg, "From"));
 872                 struct sip_session *session;
 873
 874                 call_private = sipe_media_call_new(sipe_private, with, FALSE, smsg->ice_version);
 875                 session = sipe_session_add_call(sipe_private, with);
 876                 sipe_media_dialog_init(session, msg);
 877
 878                 call_private->with = g_strdup(session->with);
 879                 sipe_private->media_call = call_private;
 880                 g_free(with);
 881         }
 882
 883         backend_media = call_private->public.backend_private;
 884
 885         if (call_private->invitation)
 886                 sipmsg_free(call_private->invitation);
 887         call_private->invitation = sipmsg_copy(msg);
 888
 889         if (smsg->media)
 890                 backend_media_relays = sipe_backend_media_relays_convert(
 891                                                 sipe_private->media_relays,
 892                                                 sipe_private->media_relay_username,
 893                                                 sipe_private->media_relay_password);
 894
 895         // Create any new media streams
 896         for (i = smsg->media; i; i = i->next) {
 897                 struct sdpmedia *media = i->data;
 898                 gchar *id = media->name;
 899                 SipeMediaType type;
 900
 901                 if (   media->port != 0
 902                     && !sipe_backend_media_get_stream_by_id(backend_media, id)) {
 903                         gchar *with;
 904
 905                         if (sipe_strequal(id, "audio"))
 906                                 type = SIPE_MEDIA_AUDIO;
 907                         else if (sipe_strequal(id, "video"))
 908                                 type = SIPE_MEDIA_VIDEO;
 909                         else
 910                                 continue;
 911
 912                         with = parse_from(sipmsg_find_header(msg, "From"));
 913                         sipe_backend_media_add_stream(backend_media, id, with,
 914                                                       type,
 915                                                       smsg->ice_version,
 916                                                       FALSE,
 917                                                       backend_media_relays);
 918                         has_new_media = TRUE;
 919                         g_free(with);
 920                 }
 921         }
 922
 923         sipe_backend_media_relays_free(backend_media_relays);
 924
 925         if (has_new_media) {
 926                 sdpmsg_free(call_private->smsg);
 927                 call_private->smsg = smsg;
 928                 sip_transport_response(sipe_private, call_private->invitation,
 929                                        180, "Ringing", NULL);
 930                 // Processing continues in candidates_prepared_cb
 931         } else {
 932                 apply_remote_message(call_private, smsg);
 933                 send_response_with_session_description(call_private, 200, "OK");
 934
 935                 sdpmsg_free(smsg);
 936         }
 937 }
 938
 939 void process_incoming_cancel_call(struct sipe_core_private *sipe_private,
 940                                   struct sipmsg *msg)
 941 {
 942         struct sipe_media_call_private *call_private = sipe_private->media_call;
 943
 944         // We respond to the CANCEL request with 200 OK response and
 945         // with 487 Request Terminated to the remote INVITE in progress.
 946         sip_transport_response(sipe_private, msg, 200, "OK", NULL);
 947
 948         if (call_private->invitation) {
 949                 sip_transport_response(sipe_private, call_private->invitation,
 950                                        487, "Request Terminated", NULL);
 951         }
 952
 953         sipe_media_hangup(call_private);
 954 }
 955
 956 static gboolean
 957 sipe_media_send_ack(struct sipe_core_private *sipe_private,
 958                     struct sipmsg *msg,
 959                     struct transaction *trans)
 960 {
 961         struct sipe_media_call_private *call_private = sipe_private->media_call;
 962         struct sip_session *session;
 963         struct sip_dialog *dialog;
 964         int tmp_cseq;
 965
 966         if (!is_media_session_msg(call_private, msg))
 967                 return FALSE;
 968
 969         session = sipe_session_find_call(sipe_private, call_private->with);
 970         dialog = session->dialogs->data;
 971         if (!dialog)
 972                 return FALSE;
 973
 974         tmp_cseq = dialog->cseq;
 975
 976         dialog->cseq = sip_transaction_cseq(trans) - 1;
 977         sip_transport_ack(sipe_private, dialog);
 978         dialog->cseq = tmp_cseq;
 979
 980         dialog->outgoing_invite = NULL;
 981
 982         return TRUE;
 983 }
 984
 985 static gboolean
 986 sipe_media_send_final_ack(struct sipe_core_private *sipe_private,
 987                           struct sipmsg *msg,
 988                           struct transaction *trans)
 989 {
 990         if (!sipe_media_send_ack(sipe_private, msg, trans))
 991                 return FALSE;
 992
 993         sipe_backend_media_accept(sipe_private->media_call->public.backend_private,
 994                                   FALSE);
 995
 996         return TRUE;
 997 }
 998
 999 static void
1000 reinvite_on_candidate_pair_cb(struct sipe_core_public *sipe_public)
1001 {
1002         struct sipe_core_private *sipe_private = SIPE_CORE_PRIVATE;
1003         struct sipe_media_call_private *media_call = sipe_private->media_call;
1004         struct sipe_backend_media *backend_media;
1005         GSList *streams;
1006
1007         if (!media_call)
1008                 return;
1009
1010         backend_media = media_call->public.backend_private;
1011         streams = sipe_backend_media_get_streams(backend_media);
1012
1013         for (; streams; streams = streams->next) {
1014                 struct sipe_backend_stream *s = streams->data;
1015                 GList *remote_candidates =  sipe_backend_media_get_active_remote_candidates(backend_media, s);
1016                 guint components = g_list_length(remote_candidates);
1017
1018                 sipe_media_candidate_list_free(remote_candidates);
1019
1020                 // We must have candidates for both (RTP + RTCP) components ready
1021                 if (components < 2) {
1022                         sipe_schedule_mseconds(sipe_private,
1023                                                "<+media-reinvite-on-candidate-pair>",
1024                                                NULL,
1025                                                500,
1026                                                (sipe_schedule_action) reinvite_on_candidate_pair_cb,
1027                                                NULL);
1028                         return;
1029                 }
1030         }
1031
1032         sipe_invite_call(sipe_private, sipe_media_send_final_ack);
1033 }
1034
1035 static gboolean
1036 process_invite_call_response(struct sipe_core_private *sipe_private,
1037                              struct sipmsg *msg,
1038                              struct transaction *trans)
1039 {
1040         const gchar *with;
1041         struct sipe_media_call_private *call_private = sipe_private->media_call;
1042         struct sipe_backend_media *backend_private;
1043         struct sip_session *session;
1044         struct sip_dialog *dialog;
1045         struct sdpmsg *smsg;
1046
1047         if (!is_media_session_msg(call_private, msg))
1048                 return FALSE;
1049
1050         session = sipe_session_find_call(sipe_private, call_private->with);
1051         dialog = session->dialogs->data;
1052
1053         backend_private = call_private->public.backend_private;
1054         with = dialog->with;
1055
1056         dialog->outgoing_invite = NULL;
1057
1058         if (msg->response >= 400) {
1059                 // Call rejected by remote peer or an error occurred
1060                 const gchar *title;
1061                 GString *desc = g_string_new("");
1062                 gboolean append_responsestr = FALSE;
1063
1064                 switch (msg->response) {
1065                         case 480: {
1066                                 title = _("User unavailable");
1067
1068                                 if (sipmsg_parse_warning(msg, NULL) == 391) {
1069                                         g_string_append_printf(desc, _("%s does not want to be disturbed"), with);
1070                                 } else
1071                                         g_string_append_printf(desc, _("User %s is not available"), with);
1072                                 break;
1073                         }
1074                         case 603:
1075                         case 605:
1076                                 title = _("Call rejected");
1077                                 g_string_append_printf(desc, _("User %s rejected call"), with);
1078                                 break;
1079                         case 488: {
1080                                 /* Check for incompatible encryption levels error.
1081                                  *
1082                                  * MS Lync 2010:
1083                                  * 488 Not Acceptable Here
1084                                  * ms-client-diagnostics: 52017;reason="Encryption levels dont match"
1085                                  *
1086                                  * older clients (and SIPE itself):
1087                                  * 488 Encryption Levels not compatible
1088                                  */
1089                                 const gchar *ms_diag = sipmsg_find_header(msg, "ms-client-diagnostics");
1090
1091                                 if (sipe_strequal(msg->responsestr, "Encryption Levels not compatible") ||
1092                                     (ms_diag && g_str_has_prefix(ms_diag, "52017;"))) {
1093                                         title = _("Unable to establish a call");
1094                                         g_string_append(desc, _("Encryption settings of peer are incompatible with ours."));
1095                                         break;
1096                                 }
1097
1098                                 if (call_private->ice_version == SIPE_ICE_RFC_5245 &&
1099                                     sip_transaction_cseq(trans) == 1) {
1100                                         gchar *with = g_strdup(call_private->with);
1101                                         gboolean with_video = sipe_backend_media_get_stream_by_id(backend_private, "video") != NULL;
1102
1103                                         sipe_media_hangup(call_private);
1104                                         // We might be calling to OC 2007 instance, retry with ICEv6
1105                                         sipe_media_initiate_call(sipe_private, with,
1106                                                                   SIPE_ICE_DRAFT_6, with_video);
1107
1108                                         g_free(with);
1109                                         return TRUE;
1110                                 }
1111                                 // Break intentionally omitted
1112                         }
1113                         default:
1114                                 title = _("Error occured");
1115                                 g_string_append(desc, _("Unable to establish a call"));
1116                                 append_responsestr = TRUE;
1117                                 break;
1118                 }
1119
1120                 if (append_responsestr)
1121                         g_string_append_printf(desc, "\n%d %s",
1122                                                msg->response, msg->responsestr);
1123
1124                 sipe_backend_notify_error(SIPE_CORE_PUBLIC, title, desc->str);
1125                 g_string_free(desc, TRUE);
1126
1127                 sipe_media_send_ack(sipe_private, msg, trans);
1128                 sipe_media_hangup(call_private);
1129
1130                 return TRUE;
1131         }
1132
1133         sipe_dialog_parse(dialog, msg, TRUE);
1134         smsg = sdpmsg_parse_msg(msg->body);
1135         if (!smsg) {
1136                 sip_transport_response(sipe_private, msg,
1137                                        488, "Not Acceptable Here", NULL);
1138                 sipe_media_hangup(call_private);
1139                 return FALSE;
1140         }
1141
1142         apply_remote_message(call_private, smsg);
1143         sdpmsg_free(smsg);
1144
1145         sipe_media_send_ack(sipe_private, msg, trans);
1146         reinvite_on_candidate_pair_cb(SIPE_CORE_PUBLIC);
1147
1148         return TRUE;
1149 }
1150
1151 gboolean is_media_session_msg(struct sipe_media_call_private *call_private,
1152                               struct sipmsg *msg)
1153 {
1154         if (call_private) {
1155                 const gchar *callid = sipmsg_find_header(msg, "Call-ID");
1156                 struct sip_session *session;
1157
1158                 session = sipe_session_find_call(call_private->sipe_private,
1159                                                  call_private->with);
1160                 if (session) {
1161                         struct sip_dialog *dialog = session->dialogs->data;
1162                         return sipe_strequal(dialog->callid, callid);
1163                 }
1164         }
1165         return FALSE;
1166 }
1167
1168 void sipe_media_handle_going_offline(struct sipe_media_call_private *call_private)
1169 {
1170         struct sipe_backend_media *backend_private;
1171
1172         backend_private = call_private->public.backend_private;
1173
1174         if (   !sipe_backend_media_is_initiator(backend_private, NULL)
1175             && !sipe_backend_media_accepted(backend_private)) {
1176                 sip_transport_response(call_private->sipe_private,
1177                                        call_private->invitation,
1178                                        480, "Temporarily Unavailable", NULL);
1179         } else {
1180                 struct sip_session *session;
1181
1182                 session = sipe_session_find_call(call_private->sipe_private,
1183                                                  call_private->with);
1184                 if (session)
1185                         sipe_session_close(call_private->sipe_private, session);
1186         }
1187
1188         sipe_media_hangup(call_private);
1189 }
1190
1191 gboolean sipe_media_is_conference_call(struct sipe_media_call_private *call_private)
1192 {
1193         return g_strstr_len(call_private->with, -1, "app:conf:audio-video:") != NULL;
1194 }
1195
1196 static void
1197 sipe_media_relay_free(struct sipe_media_relay *relay)
1198 {
1199         g_free(relay->hostname);
1200         if (relay->dns_query)
1201                 sipe_backend_dns_query_cancel(relay->dns_query);
1202         g_free(relay);
1203 }
1204
1205 void
1206 sipe_media_relay_list_free(GSList *list)
1207 {
1208         for (; list; list = g_slist_delete_link(list, list))
1209                 sipe_media_relay_free(list->data);
1210 }
1211
1212 static void
1213 relay_ip_resolved_cb(struct sipe_media_relay* relay,
1214                      const gchar *ip, SIPE_UNUSED_PARAMETER guint port)
1215 {
1216         gchar *hostname = relay->hostname;
1217         relay->dns_query = NULL;
1218
1219         if (ip && port) {
1220                 relay->hostname = g_strdup(ip);
1221                 SIPE_DEBUG_INFO("Media relay %s resolved to %s.", hostname, ip);
1222         } else {
1223                 relay->hostname = NULL;
1224                 SIPE_DEBUG_INFO("Unable to resolve media relay %s.", hostname);
1225         }
1226
1227         g_free(hostname);
1228 }
1229
1230 static gboolean
1231 process_get_av_edge_credentials_response(struct sipe_core_private *sipe_private,
1232                                          struct sipmsg *msg,
1233                                          SIPE_UNUSED_PARAMETER struct transaction *trans)
1234 {
1235         g_free(sipe_private->media_relay_username);
1236         g_free(sipe_private->media_relay_password);
1237         sipe_media_relay_list_free(sipe_private->media_relays);
1238         sipe_private->media_relay_username = NULL;
1239         sipe_private->media_relay_password = NULL;
1240         sipe_private->media_relays = NULL;
1241
1242         if (msg->response >= 400) {
1243                 SIPE_DEBUG_INFO_NOFORMAT("process_get_av_edge_credentials_response: SERVICE response is not 200. "
1244                                          "Failed to obtain A/V Edge credentials.");
1245                 return FALSE;
1246         }
1247
1248         if (msg->response == 200) {
1249                 sipe_xml *xn_response = sipe_xml_parse(msg->body, msg->bodylen);
1250
1251                 if (sipe_strequal("OK", sipe_xml_attribute(xn_response, "reasonPhrase"))) {
1252                         const sipe_xml *xn_credentials = sipe_xml_child(xn_response, "credentialsResponse/credentials");
1253                         const sipe_xml *xn_relays = sipe_xml_child(xn_response, "credentialsResponse/mediaRelayList");
1254                         const sipe_xml *item;
1255                         GSList *relays = NULL;
1256
1257                         item = sipe_xml_child(xn_credentials, "username");
1258                         sipe_private->media_relay_username = sipe_xml_data(item);
1259                         item = sipe_xml_child(xn_credentials, "password");
1260                         sipe_private->media_relay_password = sipe_xml_data(item);
1261
1262                         for (item = sipe_xml_child(xn_relays, "mediaRelay"); item; item = sipe_xml_twin(item)) {
1263                                 struct sipe_media_relay *relay = g_new0(struct sipe_media_relay, 1);
1264                                 const sipe_xml *node;
1265                                 gchar *tmp;
1266
1267                                 node = sipe_xml_child(item, "hostName");
1268                                 relay->hostname = sipe_xml_data(node);
1269
1270                                 node = sipe_xml_child(item, "udpPort");
1271                                 relay->udp_port = atoi(tmp = sipe_xml_data(node));
1272                                 g_free(tmp);
1273
1274                                 node = sipe_xml_child(item, "tcpPort");
1275                                 relay->tcp_port = atoi(tmp = sipe_xml_data(node));
1276                                 g_free(tmp);
1277
1278                                 relays = g_slist_append(relays, relay);
1279
1280                                 relay->dns_query = sipe_backend_dns_query_a(
1281                                                         SIPE_CORE_PUBLIC,
1282                                                         relay->hostname,
1283                                                         relay->udp_port,
1284                                                         (sipe_dns_resolved_cb) relay_ip_resolved_cb,
1285                                                         relay);
1286
1287                                 SIPE_DEBUG_INFO("Media relay: %s TCP: %d UDP: %d",
1288                                                 relay->hostname,
1289                                                 relay->tcp_port, relay->udp_port);
1290                         }
1291
1292                         sipe_private->media_relays = relays;
1293                 }
1294
1295                 sipe_xml_free(xn_response);
1296         }
1297
1298         return TRUE;
1299 }
1300
1301 void
1302 sipe_media_get_av_edge_credentials(struct sipe_core_private *sipe_private)
1303 {
1304         // TODO: re-request credentials after duration expires?
1305         const char CRED_REQUEST_XML[] =
1306                 "<request requestID=\"%d\" "
1307                          "from=\"%s\" "
1308                          "version=\"1.0\" "
1309                          "to=\"%s\" "
1310                          "xmlns=\"http://schemas.microsoft.com/2006/09/sip/mrasp\" "
1311                          "xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\">"
1312                         "<credentialsRequest credentialsRequestID=\"%d\">"
1313                                 "<identity>%s</identity>"
1314                                 "<location>%s</location>"
1315                                 "<duration>480</duration>"
1316                         "</credentialsRequest>"
1317                 "</request>";
1318
1319         int request_id = rand();
1320         gchar *self;
1321         gchar *body;
1322
1323         if (!sipe_private->mras_uri)
1324                 return;
1325
1326         self = sip_uri_self(sipe_private);
1327
1328         body = g_strdup_printf(
1329                 CRED_REQUEST_XML,
1330                 request_id,
1331                 self,
1332                 sipe_private->mras_uri,
1333                 request_id,
1334                 self,
1335                 SIPE_CORE_PRIVATE_FLAG_IS(REMOTE_USER) ? "internet" : "intranet");
1336         g_free(self);
1337
1338         sip_transport_service(sipe_private,
1339                               sipe_private->mras_uri,
1340                               "Content-Type: application/msrtc-media-relay-auth+xml\r\n",
1341                               body,
1342                               process_get_av_edge_credentials_response);
1343
1344         g_free(body);
1345 }
1346
1347 /*
1348   Local Variables:
1349   mode: c
1350   c-file-style: "bsd"
1351   indent-tabs-mode: t
1352   tab-width: 8
1353   End:
1354 */