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 &&
 292                 call_private->ice_version == SIPE_ICE_RFC_5245 &&
 293                 !sipe_strequal(call_private->with, sipe_private->test_call_bot_uri);
 294
 295         contact = get_contact(sipe_private);
 296         hdr = g_strdup_printf(
 297                 "ms-keep-alive: UAC;hop-hop=yes\r\n"
 298                 "Contact: %s\r\n"
 299                 "Content-Type: %s\r\n",
 300                 contact,
 301                 add_2007_fallback ?
 302                           "multipart/alternative;boundary=\"----=_NextPart_000_001E_01CB4397.0B5EB570\""
 303                         : "application/sdp");
 304         g_free(contact);
 305
 306         msg = sipe_media_to_sdpmsg(call_private);
 307         body = sdpmsg_to_string(msg);
 308
 309         if (add_2007_fallback) {
 310                 gchar *tmp;
 311                 tmp = g_strdup_printf(
 312                         "------=_NextPart_000_001E_01CB4397.0B5EB570\r\n"
 313                         "Content-Type: application/sdp\r\n"
 314                         "Content-Transfer-Encoding: 7bit\r\n"
 315                         "Content-Disposition: session; handling=optional; ms-proxy-2007fallback\r\n"
 316                         "\r\n"
 317                         "o=- 0 0 IN IP4 %s\r\n"
 318                         "s=session\r\n"
 319                         "c=IN IP4 %s\r\n"
 320                         "m=audio 0 RTP/AVP\r\n"
 321                         "\r\n"
 322                         "------=_NextPart_000_001E_01CB4397.0B5EB570\r\n"
 323                         "Content-Type: application/sdp\r\n"
 324                         "Content-Transfer-Encoding: 7bit\r\n"
 325                         "Content-Disposition: session; handling=optional\r\n"
 326                         "\r\n"
 327                         "%s"
 328                         "\r\n"
 329                         "------=_NextPart_000_001E_01CB4397.0B5EB570--\r\n",
 330                         msg->ip, msg->ip, body);
 331                 g_free(body);
 332                 body = tmp;
 333         }
 334
 335         sdpmsg_free(msg);
 336
 337         dialog->outgoing_invite = sip_transport_invite(sipe_private,
 338                                                        hdr,
 339                                                        body,
 340                                                        dialog,
 341                                                        tc);
 342
 343         g_free(body);
 344         g_free(hdr);
 345 }
 346
 347 static struct sip_dialog *
 348 sipe_media_dialog_init(struct sip_session* session, struct sipmsg *msg)
 349 {
 350         gchar *newTag = gentag();
 351         const gchar *oldHeader;
 352         gchar *newHeader;
 353         struct sip_dialog *dialog;
 354
 355         oldHeader = sipmsg_find_header(msg, "To");
 356         newHeader = g_strdup_printf("%s;tag=%s", oldHeader, newTag);
 357         sipmsg_remove_header_now(msg, "To");
 358         sipmsg_add_header_now(msg, "To", newHeader);
 359         g_free(newHeader);
 360
 361         dialog = sipe_dialog_add(session);
 362         dialog->callid = g_strdup(sipmsg_find_header(msg, "Call-ID"));
 363         dialog->with = parse_from(sipmsg_find_header(msg, "From"));
 364         sipe_dialog_parse(dialog, msg, FALSE);
 365
 366         return dialog;
 367 }
 368
 369 static void
 370 send_response_with_session_description(struct sipe_media_call_private *call_private, int code, gchar *text)
 371 {
 372         struct sdpmsg *msg = sipe_media_to_sdpmsg(call_private);
 373         gchar *body = sdpmsg_to_string(msg);
 374         sdpmsg_free(msg);
 375         sipmsg_add_header(call_private->invitation, "Content-Type", "application/sdp");
 376         sip_transport_response(call_private->sipe_private, call_private->invitation, code, text, body);
 377         g_free(body);
 378 }
 379
 380 static gboolean
 381 encryption_levels_compatible(struct sdpmsg *msg)
 382 {
 383         GSList *i;
 384
 385         for (i = msg->media; i; i = i->next) {
 386                 const gchar *enc_level;
 387                 struct sdpmedia *m = i->data;
 388
 389                 enc_level = sipe_utils_nameval_find(m->attributes, "encryption");
 390
 391                 // Decline call if peer requires encryption as we don't support it yet.
 392                 if (sipe_strequal(enc_level, "required"))
 393                         return FALSE;
 394         }
 395
 396         return TRUE;
 397 }
 398
 399 static gboolean
 400 process_invite_call_response(struct sipe_core_private *sipe_private,
 401                                                                    struct sipmsg *msg,
 402                                                                    struct transaction *trans);
 403
 404 static gboolean
 405 update_remote_media(struct sipe_media_call_private* call_private,
 406                     struct sdpmedia *media)
 407 {
 408         struct sipe_backend_media *backend_media = SIPE_MEDIA_CALL->backend_private;
 409         struct sipe_backend_stream *backend_stream;
 410         GList *backend_candidates = NULL;
 411         GList *backend_codecs = NULL;
 412         GSList *i;
 413         gboolean result = TRUE;
 414
 415         backend_stream = sipe_backend_media_get_stream_by_id(backend_media,
 416                                                              media->name);
 417         if (media->port == 0) {
 418                 if (backend_stream)
 419                         sipe_backend_media_remove_stream(backend_media, backend_stream);
 420                 return TRUE;
 421         }
 422
 423         if (!backend_stream)
 424                 return FALSE;
 425
 426         for (i = media->codecs; i; i = i->next) {
 427                 struct sdpcodec *c = i->data;
 428                 struct sipe_backend_codec *codec;
 429                 GSList *j;
 430
 431                 codec = sipe_backend_codec_new(c->id,
 432                                                c->name,
 433                                                c->type,
 434                                                c->clock_rate);
 435
 436                 for (j = c->parameters; j; j = j->next) {
 437                         struct sipnameval *attr = j->data;
 438
 439                         sipe_backend_codec_add_optional_parameter(codec,
 440                                                                   attr->name,
 441                                                                   attr->value);
 442                 }
 443
 444                 backend_codecs = g_list_append(backend_codecs, codec);
 445         }
 446
 447         result = sipe_backend_set_remote_codecs(backend_media,
 448                                                 backend_stream,
 449                                                 backend_codecs);
 450         sipe_media_codec_list_free(backend_codecs);
 451
 452         if (result == FALSE) {
 453                 sipe_backend_media_remove_stream(backend_media, backend_stream);
 454                 return FALSE;
 455         }
 456
 457         for (i = media->candidates; i; i = i->next) {
 458                 struct sdpcandidate *c = i->data;
 459                 struct sipe_backend_candidate *candidate;
 460                 candidate = sipe_backend_candidate_new(c->foundation,
 461                                                        c->component,
 462                                                        c->type,
 463                                                        c->protocol,
 464                                                        c->ip,
 465                                                        c->port,
 466                                                        c->username,
 467                                                        c->password);
 468                 sipe_backend_candidate_set_priority(candidate, c->priority);
 469
 470                 backend_candidates = g_list_append(backend_candidates, candidate);
 471         }
 472
 473         sipe_backend_media_add_remote_candidates(backend_media,
 474                                                  backend_stream,
 475                                                  backend_candidates);
 476         sipe_media_candidate_list_free(backend_candidates);
 477
 478         if (sipe_utils_nameval_find(media->attributes, "inactive")) {
 479                 sipe_backend_stream_hold(backend_media, backend_stream, FALSE);
 480         } else if (sipe_backend_stream_is_held(backend_stream)) {
 481                 sipe_backend_stream_unhold(backend_media, backend_stream, FALSE);
 482         }
 483
 484         return TRUE;
 485 }
 486
 487 static void
 488 apply_remote_message(struct sipe_media_call_private* call_private,
 489                      struct sdpmsg* msg)
 490 {
 491         GSList *i;
 492
 493         g_slist_free_full(call_private->failed_media, (GDestroyNotify)sdpmedia_free);
 494         call_private->failed_media = NULL;
 495
 496         for (i = msg->media; i; i = i->next) {
 497                 struct sdpmedia *media = i->data;
 498                 if (!update_remote_media(call_private, media)) {
 499                         media->port = 0;
 500                         call_private->failed_media =
 501                                 g_slist_append(call_private->failed_media, media);
 502                 }
 503         }
 504
 505         /* We need to keep failed medias until response is sent, remove them
 506          * from sdpmsg that is to be freed. */
 507         for (i = call_private->failed_media; i; i = i->next) {
 508                 msg->media = g_slist_remove(msg->media, i->data);
 509         }
 510
 511         call_private->encryption_compatible = encryption_levels_compatible(msg);
 512 }
 513
 514 static gboolean
 515 call_initialized(struct sipe_media_call *call)
 516 {
 517         GSList *streams =
 518                 sipe_backend_media_get_streams(call->backend_private);
 519
 520         for (; streams; streams = streams->next) {
 521                 if (!sipe_backend_stream_initialized(call->backend_private,
 522                                                      streams->data)) {
 523                         return FALSE;
 524                 }
 525         }
 526
 527         return TRUE;
 528 }
 529
 530 // Sends an invite response when the call is accepted and local candidates were
 531 // prepared, otherwise does nothing. If error response is sent, call_private is
 532 // disposed before function returns. Returns true when response was sent.
 533 static gboolean
 534 send_invite_response_if_ready(struct sipe_media_call_private *call_private)
 535 {
 536         struct sipe_backend_media *backend_media;
 537
 538         backend_media = call_private->public.backend_private;
 539
 540         if (!sipe_backend_media_accepted(backend_media) ||
 541             !call_initialized(&call_private->public))
 542                 return FALSE;
 543
 544         if (!call_private->encryption_compatible) {
 545                 struct sipe_core_private *sipe_private = call_private->sipe_private;
 546
 547                 sipmsg_add_header(call_private->invitation, "Warning",
 548                         "308 lcs.microsoft.com \"Encryption Levels not compatible\"");
 549                 sip_transport_response(sipe_private,
 550                         call_private->invitation,
 551                         488, "Encryption Levels not compatible",
 552                         NULL);
 553                 sipe_backend_media_reject(backend_media, FALSE);
 554                 sipe_backend_notify_error(SIPE_CORE_PUBLIC,
 555                                           _("Unable to establish a call"),
 556                                           _("Encryption settings of peer are incompatible with ours."));
 557         } else {
 558                 send_response_with_session_description(call_private, 200, "OK");
 559         }
 560
 561         return TRUE;
 562 }
 563
 564 static void
 565 stream_initialized_cb(struct sipe_media_call *call,
 566                       struct sipe_backend_stream *stream)
 567 {
 568         if (call_initialized(call)) {
 569                 struct sipe_media_call_private *call_private = SIPE_MEDIA_CALL_PRIVATE;
 570                 struct sipe_backend_media *backend_private = call->backend_private;
 571
 572                 if (sipe_backend_media_is_initiator(backend_private, stream)) {
 573                         sipe_invite_call(call_private->sipe_private,
 574                                          process_invite_call_response);
 575                 } else if (call_private->smsg) {
 576                         struct sdpmsg *smsg = call_private->smsg;
 577                         call_private->smsg = NULL;
 578
 579                         apply_remote_message(call_private, smsg);
 580                         send_invite_response_if_ready(call_private);
 581                         sdpmsg_free(smsg);
 582                 }
 583         }
 584 }
 585
 586 static void phone_state_publish(struct sipe_core_private *sipe_private)
 587 {
 588         if (SIPE_CORE_PRIVATE_FLAG_IS(OCS2007)) {
 589                 sipe_ocs2007_phone_state_publish(sipe_private);
 590         } else {
 591                 // TODO: OCS 2005 support. Is anyone still using it at all?
 592         }
 593 }
 594
 595 static void
 596 media_end_cb(struct sipe_media_call *call)
 597 {
 598         g_return_if_fail(call);
 599
 600         SIPE_MEDIA_CALL_PRIVATE->sipe_private->media_call = NULL;
 601         phone_state_publish(SIPE_MEDIA_CALL_PRIVATE->sipe_private);
 602         sipe_media_call_free(SIPE_MEDIA_CALL_PRIVATE);
 603 }
 604
 605 static void
 606 call_accept_cb(struct sipe_media_call *call, gboolean local)
 607 {
 608         if (local) {
 609                 send_invite_response_if_ready(SIPE_MEDIA_CALL_PRIVATE);
 610         }
 611         phone_state_publish(SIPE_MEDIA_CALL_PRIVATE->sipe_private);
 612 }
 613
 614 static void
 615 call_reject_cb(struct sipe_media_call *call, gboolean local)
 616 {
 617         if (local) {
 618                 struct sipe_media_call_private *call_private = SIPE_MEDIA_CALL_PRIVATE;
 619                 sip_transport_response(call_private->sipe_private,
 620                                        call_private->invitation,
 621                                        603, "Decline", NULL);
 622         }
 623 }
 624
 625 static gboolean
 626 sipe_media_send_ack(struct sipe_core_private *sipe_private, struct sipmsg *msg,
 627                                         struct transaction *trans);
 628
 629 static void call_hold_cb(struct sipe_media_call *call,
 630                          gboolean local,
 631                          SIPE_UNUSED_PARAMETER gboolean state)
 632 {
 633         if (local)
 634                 sipe_invite_call(SIPE_MEDIA_CALL_PRIVATE->sipe_private,
 635                                  sipe_media_send_ack);
 636 }
 637
 638 static void call_hangup_cb(struct sipe_media_call *call, gboolean local)
 639 {
 640         if (local) {
 641                 struct sipe_media_call_private *call_private = SIPE_MEDIA_CALL_PRIVATE;
 642                 struct sip_session *session;
 643                 session = sipe_session_find_call(call_private->sipe_private,
 644                                                  call_private->with);
 645
 646                 if (session) {
 647                         sipe_session_close(call_private->sipe_private, session);
 648                 }
 649         }
 650 }
 651
 652 static void
 653 error_cb(struct sipe_media_call *call, gchar *message)
 654 {
 655         struct sipe_media_call_private *call_private = SIPE_MEDIA_CALL_PRIVATE;
 656         struct sipe_core_private *sipe_private = call_private->sipe_private;
 657         gboolean initiator = sipe_backend_media_is_initiator(call->backend_private, NULL);
 658         gboolean accepted = sipe_backend_media_accepted(call->backend_private);
 659
 660         gchar *title = g_strdup_printf("Call with %s failed", call_private->with);
 661         sipe_backend_notify_error(SIPE_CORE_PUBLIC, title, message);
 662         g_free(title);
 663
 664         if (!initiator && !accepted) {
 665                 sip_transport_response(sipe_private,
 666                                        call_private->invitation,
 667                                        488, "Not Acceptable Here", NULL);
 668         }
 669
 670         sipe_backend_media_hangup(call->backend_private, initiator || accepted);
 671 }
 672
 673 static struct sipe_media_call_private *
 674 sipe_media_call_new(struct sipe_core_private *sipe_private,
 675                     const gchar* with, gboolean initiator, SipeIceVersion ice_version)
 676 {
 677         struct sipe_media_call_private *call_private = g_new0(struct sipe_media_call_private, 1);
 678         gchar *cname;
 679
 680         call_private->sipe_private = sipe_private;
 681
 682         cname = g_strdup(sipe_private->contact + 1);
 683         cname[strlen(cname) - 1] = '\0';
 684
 685         call_private->public.backend_private = sipe_backend_media_new(SIPE_CORE_PUBLIC,
 686                                                                       SIPE_MEDIA_CALL,
 687                                                                       with,
 688                                                                       initiator);
 689         sipe_backend_media_set_cname(call_private->public.backend_private, cname);
 690
 691         call_private->ice_version = ice_version;
 692         call_private->encryption_compatible = TRUE;
 693
 694         call_private->public.stream_initialized_cb  = stream_initialized_cb;
 695         call_private->public.media_end_cb           = media_end_cb;
 696         call_private->public.call_accept_cb         = call_accept_cb;
 697         call_private->public.call_reject_cb         = call_reject_cb;
 698         call_private->public.call_hold_cb           = call_hold_cb;
 699         call_private->public.call_hangup_cb         = call_hangup_cb;
 700         call_private->public.error_cb               = error_cb;
 701
 702         g_free(cname);
 703
 704         return call_private;
 705 }
 706
 707 void sipe_media_hangup(struct sipe_media_call_private *call_private)
 708 {
 709         if (call_private) {
 710                 sipe_backend_media_hangup(call_private->public.backend_private,
 711                                           FALSE);
 712         }
 713 }
 714
 715 static void
 716 sipe_media_initiate_call(struct sipe_core_private *sipe_private,
 717                          const char *with, SipeIceVersion ice_version,
 718                          gboolean with_video)
 719 {
 720         struct sipe_media_call_private *call_private;
 721         struct sipe_backend_media *backend_media;
 722         struct sipe_backend_media_relays *backend_media_relays;
 723         struct sip_session *session;
 724         struct sip_dialog *dialog;
 725
 726         if (sipe_private->media_call)
 727                 return;
 728
 729         call_private = sipe_media_call_new(sipe_private, with, TRUE, ice_version);
 730
 731         session = sipe_session_add_call(sipe_private, with);
 732         dialog = sipe_dialog_add(session);
 733         dialog->callid = gencallid();
 734         dialog->with = g_strdup(session->with);
 735         dialog->ourtag = gentag();
 736
 737         call_private->with = g_strdup(session->with);
 738
 739         backend_media = call_private->public.backend_private;
 740
 741         backend_media_relays =
 742                 sipe_backend_media_relays_convert(sipe_private->media_relays,
 743                                                   sipe_private->media_relay_username,
 744                                                   sipe_private->media_relay_password);
 745
 746         if (!sipe_backend_media_add_stream(backend_media,
 747                                            "audio", with, SIPE_MEDIA_AUDIO,
 748                                            call_private->ice_version, TRUE,
 749                                            backend_media_relays)) {
 750                 sipe_backend_notify_error(SIPE_CORE_PUBLIC,
 751                                           _("Error occured"),
 752                                           _("Error creating audio stream"));
 753                 sipe_media_call_free(call_private);
 754                 sipe_backend_media_relays_free(backend_media_relays);
 755                 return;
 756         }
 757
 758         if (   with_video
 759             && !sipe_backend_media_add_stream(backend_media,
 760                                               "video", with, SIPE_MEDIA_VIDEO,
 761                                               call_private->ice_version, TRUE,
 762                                               backend_media_relays)) {
 763                 sipe_backend_notify_error(SIPE_CORE_PUBLIC,
 764                                           _("Error occured"),
 765                                           _("Error creating video stream"));
 766                 sipe_media_call_free(call_private);
 767                 sipe_backend_media_relays_free(backend_media_relays);
 768                 return;
 769         }
 770
 771         sipe_private->media_call = call_private;
 772
 773         sipe_backend_media_relays_free(backend_media_relays);
 774
 775         // Processing continues in candidates_prepared_cb
 776 }
 777
 778 void
 779 sipe_core_media_initiate_call(struct sipe_core_public *sipe_public,
 780                               const char *with,
 781                               gboolean with_video)
 782 {
 783         sipe_media_initiate_call(SIPE_CORE_PRIVATE, with,
 784                                  SIPE_ICE_RFC_5245, with_video);
 785 }
 786
 787 void sipe_core_media_connect_conference(struct sipe_core_public *sipe_public,
 788                                         struct sipe_chat_session *chat_session)
 789 {
 790         struct sipe_core_private *sipe_private = SIPE_CORE_PRIVATE;
 791         struct sipe_backend_media_relays *backend_media_relays;
 792         struct sip_session *session;
 793         struct sip_dialog *dialog;
 794         gchar **parts;
 795         gchar *av_uri;
 796
 797         session = sipe_session_find_chat(sipe_private, chat_session);
 798
 799         if (sipe_private->media_call || !session)
 800                 return;
 801
 802         session->is_call = TRUE;
 803
 804         parts = g_strsplit(chat_session->id, "app:conf:focus:", 2);
 805         av_uri = g_strjoinv("app:conf:audio-video:", parts);
 806         g_strfreev(parts);
 807
 808         sipe_private->media_call = sipe_media_call_new(sipe_private, av_uri,
 809                                                        TRUE, SIPE_ICE_DRAFT_6);
 810
 811         session = sipe_session_add_call(sipe_private, av_uri);
 812         dialog = sipe_dialog_add(session);
 813         dialog->callid = gencallid();
 814         dialog->with = g_strdup(session->with);
 815         dialog->ourtag = gentag();
 816
 817         g_free(av_uri);
 818
 819         sipe_private->media_call->with = g_strdup(session->with);
 820
 821         backend_media_relays =
 822                 sipe_backend_media_relays_convert(sipe_private->media_relays,
 823                                                   sipe_private->media_relay_username,
 824                                                   sipe_private->media_relay_password);
 825
 826         if (!sipe_backend_media_add_stream(sipe_private->media_call->public.backend_private,
 827                                            "audio", dialog->with,
 828                                            SIPE_MEDIA_AUDIO,
 829                                            sipe_private->media_call->ice_version,
 830                                            TRUE, backend_media_relays)) {
 831                 sipe_backend_notify_error(sipe_public,
 832                                           _("Error occured"),
 833                                           _("Error creating audio stream"));
 834                 sipe_media_call_free(sipe_private->media_call);
 835                 sipe_private->media_call = NULL;
 836         }
 837
 838         sipe_backend_media_relays_free(backend_media_relays);
 839
 840         // Processing continues in candidates_prepared_cb
 841 }
 842
 843 gboolean sipe_core_media_in_call(struct sipe_core_public *sipe_public)
 844 {
 845         if (sipe_public) {
 846                 return SIPE_CORE_PRIVATE->media_call != NULL;
 847         }
 848         return FALSE;
 849 }
 850
 851 void sipe_core_media_test_call(struct sipe_core_public *sipe_public)
 852 {
 853         struct sipe_core_private *sipe_private = SIPE_CORE_PRIVATE;
 854         if (!sipe_private->test_call_bot_uri) {
 855                 sipe_backend_notify_error(sipe_public,
 856                                           _("Unable to establish a call"),
 857                                           _("Audio Test Service is not available."));
 858                 return;
 859         }
 860
 861         sipe_core_media_initiate_call(sipe_public,
 862                                       sipe_private->test_call_bot_uri, FALSE);
 863 }
 864
 865 void
 866 process_incoming_invite_call(struct sipe_core_private *sipe_private,
 867                              struct sipmsg *msg)
 868 {
 869         struct sipe_media_call_private *call_private = sipe_private->media_call;
 870         struct sipe_backend_media *backend_media;
 871         struct sipe_backend_media_relays *backend_media_relays = NULL;
 872         struct sdpmsg *smsg;
 873         gboolean has_new_media = FALSE;
 874         GSList *i;
 875
 876         if (call_private && !is_media_session_msg(call_private, msg)) {
 877                 sip_transport_response(sipe_private, msg, 486, "Busy Here", NULL);
 878                 return;
 879         }
 880
 881         smsg = sdpmsg_parse_msg(msg->body);
 882         if (!smsg) {
 883                 sip_transport_response(sipe_private, msg,
 884                                        488, "Not Acceptable Here", NULL);
 885                 sipe_media_hangup(call_private);
 886                 return;
 887         }
 888
 889         if (!call_private) {
 890                 gchar *with = parse_from(sipmsg_find_header(msg, "From"));
 891                 struct sip_session *session;
 892
 893                 call_private = sipe_media_call_new(sipe_private, with, FALSE, smsg->ice_version);
 894                 session = sipe_session_add_call(sipe_private, with);
 895                 sipe_media_dialog_init(session, msg);
 896
 897                 call_private->with = g_strdup(session->with);
 898                 sipe_private->media_call = call_private;
 899                 g_free(with);
 900         }
 901
 902         backend_media = call_private->public.backend_private;
 903
 904         if (call_private->invitation)
 905                 sipmsg_free(call_private->invitation);
 906         call_private->invitation = sipmsg_copy(msg);
 907
 908         if (smsg->media)
 909                 backend_media_relays = sipe_backend_media_relays_convert(
 910                                                 sipe_private->media_relays,
 911                                                 sipe_private->media_relay_username,
 912                                                 sipe_private->media_relay_password);
 913
 914         // Create any new media streams
 915         for (i = smsg->media; i; i = i->next) {
 916                 struct sdpmedia *media = i->data;
 917                 gchar *id = media->name;
 918                 SipeMediaType type;
 919
 920                 if (   media->port != 0
 921                     && !sipe_backend_media_get_stream_by_id(backend_media, id)) {
 922                         gchar *with;
 923
 924                         if (sipe_strequal(id, "audio"))
 925                                 type = SIPE_MEDIA_AUDIO;
 926                         else if (sipe_strequal(id, "video"))
 927                                 type = SIPE_MEDIA_VIDEO;
 928                         else
 929                                 continue;
 930
 931                         with = parse_from(sipmsg_find_header(msg, "From"));
 932                         sipe_backend_media_add_stream(backend_media, id, with,
 933                                                       type,
 934                                                       smsg->ice_version,
 935                                                       FALSE,
 936                                                       backend_media_relays);
 937                         has_new_media = TRUE;
 938                         g_free(with);
 939                 }
 940         }
 941
 942         sipe_backend_media_relays_free(backend_media_relays);
 943
 944         if (has_new_media) {
 945                 sdpmsg_free(call_private->smsg);
 946                 call_private->smsg = smsg;
 947                 sip_transport_response(sipe_private, call_private->invitation,
 948                                        180, "Ringing", NULL);
 949                 // Processing continues in candidates_prepared_cb
 950         } else {
 951                 apply_remote_message(call_private, smsg);
 952                 send_response_with_session_description(call_private, 200, "OK");
 953
 954                 sdpmsg_free(smsg);
 955         }
 956 }
 957
 958 void process_incoming_cancel_call(struct sipe_core_private *sipe_private,
 959                                   struct sipmsg *msg)
 960 {
 961         struct sipe_media_call_private *call_private = sipe_private->media_call;
 962
 963         // We respond to the CANCEL request with 200 OK response and
 964         // with 487 Request Terminated to the remote INVITE in progress.
 965         sip_transport_response(sipe_private, msg, 200, "OK", NULL);
 966
 967         if (call_private->invitation) {
 968                 sip_transport_response(sipe_private, call_private->invitation,
 969                                        487, "Request Terminated", NULL);
 970         }
 971
 972         sipe_media_hangup(call_private);
 973 }
 974
 975 static gboolean
 976 sipe_media_send_ack(struct sipe_core_private *sipe_private,
 977                     struct sipmsg *msg,
 978                     struct transaction *trans)
 979 {
 980         struct sipe_media_call_private *call_private = sipe_private->media_call;
 981         struct sip_session *session;
 982         struct sip_dialog *dialog;
 983         int tmp_cseq;
 984
 985         if (!is_media_session_msg(call_private, msg))
 986                 return FALSE;
 987
 988         session = sipe_session_find_call(sipe_private, call_private->with);
 989         dialog = session->dialogs->data;
 990         if (!dialog)
 991                 return FALSE;
 992
 993         tmp_cseq = dialog->cseq;
 994
 995         dialog->cseq = sip_transaction_cseq(trans) - 1;
 996         sip_transport_ack(sipe_private, dialog);
 997         dialog->cseq = tmp_cseq;
 998
 999         dialog->outgoing_invite = NULL;
1000
1001         return TRUE;
1002 }
1003
1004 static gboolean
1005 sipe_media_send_final_ack(struct sipe_core_private *sipe_private,
1006                           struct sipmsg *msg,
1007                           struct transaction *trans)
1008 {
1009         if (!sipe_media_send_ack(sipe_private, msg, trans))
1010                 return FALSE;
1011
1012         sipe_backend_media_accept(sipe_private->media_call->public.backend_private,
1013                                   FALSE);
1014
1015         return TRUE;
1016 }
1017
1018 static void
1019 reinvite_on_candidate_pair_cb(struct sipe_core_public *sipe_public)
1020 {
1021         struct sipe_core_private *sipe_private = SIPE_CORE_PRIVATE;
1022         struct sipe_media_call_private *media_call = sipe_private->media_call;
1023         struct sipe_backend_media *backend_media;
1024         GSList *streams;
1025
1026         if (!media_call)
1027                 return;
1028
1029         backend_media = media_call->public.backend_private;
1030         streams = sipe_backend_media_get_streams(backend_media);
1031
1032         for (; streams; streams = streams->next) {
1033                 struct sipe_backend_stream *s = streams->data;
1034                 GList *remote_candidates =  sipe_backend_media_get_active_remote_candidates(backend_media, s);
1035                 guint components = g_list_length(remote_candidates);
1036
1037                 sipe_media_candidate_list_free(remote_candidates);
1038
1039                 // We must have candidates for both (RTP + RTCP) components ready
1040                 if (components < 2) {
1041                         sipe_schedule_mseconds(sipe_private,
1042                                                "<+media-reinvite-on-candidate-pair>",
1043                                                NULL,
1044                                                500,
1045                                                (sipe_schedule_action) reinvite_on_candidate_pair_cb,
1046                                                NULL);
1047                         return;
1048                 }
1049         }
1050
1051         sipe_invite_call(sipe_private, sipe_media_send_final_ack);
1052 }
1053
1054 static gboolean
1055 process_invite_call_response(struct sipe_core_private *sipe_private,
1056                              struct sipmsg *msg,
1057                              struct transaction *trans)
1058 {
1059         const gchar *with;
1060         struct sipe_media_call_private *call_private = sipe_private->media_call;
1061         struct sipe_backend_media *backend_private;
1062         struct sip_session *session;
1063         struct sip_dialog *dialog;
1064         struct sdpmsg *smsg;
1065
1066         if (!is_media_session_msg(call_private, msg))
1067                 return FALSE;
1068
1069         session = sipe_session_find_call(sipe_private, call_private->with);
1070         dialog = session->dialogs->data;
1071
1072         backend_private = call_private->public.backend_private;
1073         with = dialog->with;
1074
1075         dialog->outgoing_invite = NULL;
1076
1077         if (msg->response >= 400) {
1078                 // Call rejected by remote peer or an error occurred
1079                 const gchar *title;
1080                 GString *desc = g_string_new("");
1081                 gboolean append_responsestr = FALSE;
1082
1083                 switch (msg->response) {
1084                         case 480: {
1085                                 title = _("User unavailable");
1086
1087                                 if (sipmsg_parse_warning(msg, NULL) == 391) {
1088                                         g_string_append_printf(desc, _("%s does not want to be disturbed"), with);
1089                                 } else
1090                                         g_string_append_printf(desc, _("User %s is not available"), with);
1091                                 break;
1092                         }
1093                         case 603:
1094                         case 605:
1095                                 title = _("Call rejected");
1096                                 g_string_append_printf(desc, _("User %s rejected call"), with);
1097                                 break;
1098                         case 488: {
1099                                 /* Check for incompatible encryption levels error.
1100                                  *
1101                                  * MS Lync 2010:
1102                                  * 488 Not Acceptable Here
1103                                  * ms-client-diagnostics: 52017;reason="Encryption levels dont match"
1104                                  *
1105                                  * older clients (and SIPE itself):
1106                                  * 488 Encryption Levels not compatible
1107                                  */
1108                                 const gchar *ms_diag = sipmsg_find_header(msg, "ms-client-diagnostics");
1109
1110                                 if (sipe_strequal(msg->responsestr, "Encryption Levels not compatible") ||
1111                                     (ms_diag && g_str_has_prefix(ms_diag, "52017;"))) {
1112                                         title = _("Unable to establish a call");
1113                                         g_string_append(desc, _("Encryption settings of peer are incompatible with ours."));
1114                                         break;
1115                                 }
1116
1117                                 if (call_private->ice_version == SIPE_ICE_RFC_5245 &&
1118                                     sip_transaction_cseq(trans) == 1) {
1119                                         gchar *with = g_strdup(call_private->with);
1120                                         gboolean with_video = sipe_backend_media_get_stream_by_id(backend_private, "video") != NULL;
1121
1122                                         sipe_media_hangup(call_private);
1123                                         // We might be calling to OC 2007 instance, retry with ICEv6
1124                                         sipe_media_initiate_call(sipe_private, with,
1125                                                                   SIPE_ICE_DRAFT_6, with_video);
1126
1127                                         g_free(with);
1128                                         return TRUE;
1129                                 }
1130                                 // Break intentionally omitted
1131                         }
1132                         default:
1133                                 title = _("Error occured");
1134                                 g_string_append(desc, _("Unable to establish a call"));
1135                                 append_responsestr = TRUE;
1136                                 break;
1137                 }
1138
1139                 if (append_responsestr)
1140                         g_string_append_printf(desc, "\n%d %s",
1141                                                msg->response, msg->responsestr);
1142
1143                 sipe_backend_notify_error(SIPE_CORE_PUBLIC, title, desc->str);
1144                 g_string_free(desc, TRUE);
1145
1146                 sipe_media_send_ack(sipe_private, msg, trans);
1147                 sipe_media_hangup(call_private);
1148
1149                 return TRUE;
1150         }
1151
1152         sipe_dialog_parse(dialog, msg, TRUE);
1153         smsg = sdpmsg_parse_msg(msg->body);
1154         if (!smsg) {
1155                 sip_transport_response(sipe_private, msg,
1156                                        488, "Not Acceptable Here", NULL);
1157                 sipe_media_hangup(call_private);
1158                 return FALSE;
1159         }
1160
1161         apply_remote_message(call_private, smsg);
1162         sdpmsg_free(smsg);
1163
1164         sipe_media_send_ack(sipe_private, msg, trans);
1165         reinvite_on_candidate_pair_cb(SIPE_CORE_PUBLIC);
1166
1167         return TRUE;
1168 }
1169
1170 gboolean is_media_session_msg(struct sipe_media_call_private *call_private,
1171                               struct sipmsg *msg)
1172 {
1173         if (call_private) {
1174                 const gchar *callid = sipmsg_find_header(msg, "Call-ID");
1175                 struct sip_session *session;
1176
1177                 session = sipe_session_find_call(call_private->sipe_private,
1178                                                  call_private->with);
1179                 if (session) {
1180                         struct sip_dialog *dialog = session->dialogs->data;
1181                         return sipe_strequal(dialog->callid, callid);
1182                 }
1183         }
1184         return FALSE;
1185 }
1186
1187 void sipe_media_handle_going_offline(struct sipe_media_call_private *call_private)
1188 {
1189         struct sipe_backend_media *backend_private;
1190
1191         backend_private = call_private->public.backend_private;
1192
1193         if (   !sipe_backend_media_is_initiator(backend_private, NULL)
1194             && !sipe_backend_media_accepted(backend_private)) {
1195                 sip_transport_response(call_private->sipe_private,
1196                                        call_private->invitation,
1197                                        480, "Temporarily Unavailable", NULL);
1198         } else {
1199                 struct sip_session *session;
1200
1201                 session = sipe_session_find_call(call_private->sipe_private,
1202                                                  call_private->with);
1203                 if (session)
1204                         sipe_session_close(call_private->sipe_private, session);
1205         }
1206
1207         sipe_media_hangup(call_private);
1208 }
1209
1210 gboolean sipe_media_is_conference_call(struct sipe_media_call_private *call_private)
1211 {
1212         return g_strstr_len(call_private->with, -1, "app:conf:audio-video:") != NULL;
1213 }
1214
1215 static void
1216 sipe_media_relay_free(struct sipe_media_relay *relay)
1217 {
1218         g_free(relay->hostname);
1219         if (relay->dns_query)
1220                 sipe_backend_dns_query_cancel(relay->dns_query);
1221         g_free(relay);
1222 }
1223
1224 void
1225 sipe_media_relay_list_free(GSList *list)
1226 {
1227         for (; list; list = g_slist_delete_link(list, list))
1228                 sipe_media_relay_free(list->data);
1229 }
1230
1231 static void
1232 relay_ip_resolved_cb(struct sipe_media_relay* relay,
1233                      const gchar *ip, SIPE_UNUSED_PARAMETER guint port)
1234 {
1235         gchar *hostname = relay->hostname;
1236         relay->dns_query = NULL;
1237
1238         if (ip && port) {
1239                 relay->hostname = g_strdup(ip);
1240                 SIPE_DEBUG_INFO("Media relay %s resolved to %s.", hostname, ip);
1241         } else {
1242                 relay->hostname = NULL;
1243                 SIPE_DEBUG_INFO("Unable to resolve media relay %s.", hostname);
1244         }
1245
1246         g_free(hostname);
1247 }
1248
1249 static gboolean
1250 process_get_av_edge_credentials_response(struct sipe_core_private *sipe_private,
1251                                          struct sipmsg *msg,
1252                                          SIPE_UNUSED_PARAMETER struct transaction *trans)
1253 {
1254         g_free(sipe_private->media_relay_username);
1255         g_free(sipe_private->media_relay_password);
1256         sipe_media_relay_list_free(sipe_private->media_relays);
1257         sipe_private->media_relay_username = NULL;
1258         sipe_private->media_relay_password = NULL;
1259         sipe_private->media_relays = NULL;
1260
1261         if (msg->response >= 400) {
1262                 SIPE_DEBUG_INFO_NOFORMAT("process_get_av_edge_credentials_response: SERVICE response is not 200. "
1263                                          "Failed to obtain A/V Edge credentials.");
1264                 return FALSE;
1265         }
1266
1267         if (msg->response == 200) {
1268                 sipe_xml *xn_response = sipe_xml_parse(msg->body, msg->bodylen);
1269
1270                 if (sipe_strequal("OK", sipe_xml_attribute(xn_response, "reasonPhrase"))) {
1271                         const sipe_xml *xn_credentials = sipe_xml_child(xn_response, "credentialsResponse/credentials");
1272                         const sipe_xml *xn_relays = sipe_xml_child(xn_response, "credentialsResponse/mediaRelayList");
1273                         const sipe_xml *item;
1274                         GSList *relays = NULL;
1275
1276                         item = sipe_xml_child(xn_credentials, "username");
1277                         sipe_private->media_relay_username = sipe_xml_data(item);
1278                         item = sipe_xml_child(xn_credentials, "password");
1279                         sipe_private->media_relay_password = sipe_xml_data(item);
1280
1281                         for (item = sipe_xml_child(xn_relays, "mediaRelay"); item; item = sipe_xml_twin(item)) {
1282                                 struct sipe_media_relay *relay = g_new0(struct sipe_media_relay, 1);
1283                                 const sipe_xml *node;
1284                                 gchar *tmp;
1285
1286                                 node = sipe_xml_child(item, "hostName");
1287                                 relay->hostname = sipe_xml_data(node);
1288
1289                                 node = sipe_xml_child(item, "udpPort");
1290                                 relay->udp_port = atoi(tmp = sipe_xml_data(node));
1291                                 g_free(tmp);
1292
1293                                 node = sipe_xml_child(item, "tcpPort");
1294                                 relay->tcp_port = atoi(tmp = sipe_xml_data(node));
1295                                 g_free(tmp);
1296
1297                                 relays = g_slist_append(relays, relay);
1298
1299                                 relay->dns_query = sipe_backend_dns_query_a(
1300                                                         SIPE_CORE_PUBLIC,
1301                                                         relay->hostname,
1302                                                         relay->udp_port,
1303                                                         (sipe_dns_resolved_cb) relay_ip_resolved_cb,
1304                                                         relay);
1305
1306                                 SIPE_DEBUG_INFO("Media relay: %s TCP: %d UDP: %d",
1307                                                 relay->hostname,
1308                                                 relay->tcp_port, relay->udp_port);
1309                         }
1310
1311                         sipe_private->media_relays = relays;
1312                 }
1313
1314                 sipe_xml_free(xn_response);
1315         }
1316
1317         return TRUE;
1318 }
1319
1320 void
1321 sipe_media_get_av_edge_credentials(struct sipe_core_private *sipe_private)
1322 {
1323         // TODO: re-request credentials after duration expires?
1324         const char CRED_REQUEST_XML[] =
1325                 "<request requestID=\"%d\" "
1326                          "from=\"%s\" "
1327                          "version=\"1.0\" "
1328                          "to=\"%s\" "
1329                          "xmlns=\"http://schemas.microsoft.com/2006/09/sip/mrasp\" "
1330                          "xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\">"
1331                         "<credentialsRequest credentialsRequestID=\"%d\">"
1332                                 "<identity>%s</identity>"
1333                                 "<location>%s</location>"
1334                                 "<duration>480</duration>"
1335                         "</credentialsRequest>"
1336                 "</request>";
1337
1338         int request_id = rand();
1339         gchar *self;
1340         gchar *body;
1341
1342         if (!sipe_private->mras_uri)
1343                 return;
1344
1345         self = sip_uri_self(sipe_private);
1346
1347         body = g_strdup_printf(
1348                 CRED_REQUEST_XML,
1349                 request_id,
1350                 self,
1351                 sipe_private->mras_uri,
1352                 request_id,
1353                 self,
1354                 SIPE_CORE_PRIVATE_FLAG_IS(REMOTE_USER) ? "internet" : "intranet");
1355         g_free(self);
1356
1357         sip_transport_service(sipe_private,
1358                               sipe_private->mras_uri,
1359                               "Content-Type: application/msrtc-media-relay-auth+xml\r\n",
1360                               body,
1361                               process_get_av_edge_credentials_response);
1362
1363         g_free(body);
1364 }
1365
1366 /*
1367   Local Variables:
1368   mode: c
1369   c-file-style: "bsd"
1370   indent-tabs-mode: t
1371   tab-width: 8
1372   End:
1373 */