src/core/sdpmsg.c

   1 /**
   2  * @file sdpmsg.c
   3  *
   4  * pidgin-sipe
   5  *
   6  * Copyright (C) 2013 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 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 #include <glib.h>
  29
  30 #include "sipe-backend.h"
  31 #include "sdpmsg.h"
  32 #include "sipe-utils.h"
  33
  34 static gboolean
  35 append_attribute(struct sdpmedia *media, gchar *attr)
  36 {
  37         gchar **parts = g_strsplit(attr + 2, ":", 2);
  38
  39         if(!parts[0]) {
  40                 g_strfreev(parts);
  41                 return FALSE;
  42         }
  43
  44         media->attributes = sipe_utils_nameval_add(media->attributes,
  45                                                    parts[0],
  46                                                    parts[1] ? parts[1] : "");
  47         g_strfreev(parts);
  48         return TRUE;
  49 }
  50
  51 static gboolean
  52 parse_attributes(struct sdpmsg *smsg, gchar *msg) {
  53         gchar           **lines = g_strsplit(msg, "\r\n", 0);
  54         gchar           **ptr = lines;
  55
  56         while (*ptr != NULL) {
  57                 if (g_str_has_prefix(*ptr, "o=")) {
  58                         gchar **parts = g_strsplit(*ptr + 2, " ", 6);
  59                         smsg->ip = g_strdup(parts[5]);
  60                         g_strfreev(parts);
  61                 } else if (g_str_has_prefix(*ptr, "m=")) {
  62                         gchar **parts = g_strsplit(*ptr + 2, " ", 3);
  63                         struct sdpmedia *media = g_new0(struct sdpmedia, 1);
  64
  65                         smsg->media = g_slist_append(smsg->media, media);
  66
  67                         media->name = g_strdup(parts[0]);
  68                         media->port = atoi(parts[1]);
  69
  70                         g_strfreev(parts);
  71
  72                         while (*(++ptr) && !g_str_has_prefix(*ptr, "m=")) {
  73
  74                                 if (g_str_has_prefix(*ptr, "a=")) {
  75                                         if (!append_attribute(media, *ptr)) {
  76                                                 g_strfreev(lines);
  77                                                 return FALSE;
  78                                         }
  79                                 }
  80                         }
  81                         continue;
  82                 }
  83
  84                 ++ptr;
  85         }
  86
  87         g_strfreev(lines);
  88
  89         return TRUE;
  90 }
  91
  92 static struct sdpcandidate * sdpcandidate_copy(struct sdpcandidate *candidate);
  93 static void sdpcandidate_free(struct sdpcandidate *candidate);
  94
  95 static SipeComponentType
  96 parse_component(const gchar *str)
  97 {
  98         switch (atoi(str)) {
  99                 case 1: return  SIPE_COMPONENT_RTP;
 100                 case 2: return  SIPE_COMPONENT_RTCP;
 101                 default: return SIPE_COMPONENT_NONE;
 102         }
 103 }
 104
 105 static gchar *
 106 base64_pad(const gchar* str)
 107 {
 108         size_t str_len = strlen(str);
 109         int mod = str_len % 4;
 110
 111         if (mod > 0) {
 112                 gchar *result = NULL;
 113                 int pad = 4 - mod;
 114                 gchar *ptr = result = g_malloc(str_len + pad + 1);
 115
 116                 memcpy(ptr, str, str_len);
 117                 ptr += str_len;
 118                 memset(ptr, '=', pad);
 119                 ptr += pad;
 120                 *ptr = '\0';
 121
 122                 return result;
 123         } else
 124                 return g_strdup(str);
 125 }
 126
 127 static GSList *
 128 parse_append_candidate_draft_6(gchar **tokens, GSList *candidates)
 129 {
 130         struct sdpcandidate *candidate = g_new0(struct sdpcandidate, 1);
 131
 132         candidate->username = base64_pad(tokens[0]);
 133         candidate->component = parse_component(tokens[1]);
 134         candidate->password = base64_pad(tokens[2]);
 135
 136         if (sipe_strequal(tokens[3], "UDP"))
 137                 candidate->protocol = SIPE_NETWORK_PROTOCOL_UDP;
 138         else if (sipe_strequal(tokens[3], "TCP"))
 139                 candidate->protocol = SIPE_NETWORK_PROTOCOL_TCP_ACTIVE;
 140         else {
 141                 sdpcandidate_free(candidate);
 142                 return candidates;
 143         }
 144
 145         candidate->priority = atoi(tokens[4] + 2);
 146         candidate->ip = g_strdup(tokens[5]);
 147         candidate->port = atoi(tokens[6]);
 148
 149         candidates = g_slist_append(candidates, candidate);
 150
 151         // draft 6 candidates are both active and passive
 152         if (candidate->protocol == SIPE_NETWORK_PROTOCOL_TCP_ACTIVE) {
 153                 candidate = sdpcandidate_copy(candidate);
 154                 candidate->protocol = SIPE_NETWORK_PROTOCOL_TCP_PASSIVE;
 155                 candidates = g_slist_append(candidates, candidate);
 156         }
 157
 158         return candidates;
 159 }
 160
 161 static GSList *
 162 parse_append_candidate_rfc_5245(gchar **tokens, GSList *candidates)
 163 {
 164         struct sdpcandidate *candidate = g_new0(struct sdpcandidate, 1);
 165
 166         candidate->foundation = g_strdup(tokens[0]);
 167         candidate->component = parse_component(tokens[1]);
 168
 169         if (sipe_strequal(tokens[2], "UDP"))
 170                 candidate->protocol = SIPE_NETWORK_PROTOCOL_UDP;
 171         else if (sipe_strequal(tokens[2], "TCP-ACT"))
 172                 candidate->protocol = SIPE_NETWORK_PROTOCOL_TCP_ACTIVE;
 173         else if (sipe_strequal(tokens[2], "TCP-PASS"))
 174                 candidate->protocol = SIPE_NETWORK_PROTOCOL_TCP_PASSIVE;
 175         else {
 176                 sdpcandidate_free(candidate);
 177                 return candidates;
 178         }
 179
 180         candidate->priority = atoi(tokens[3]);
 181         candidate->ip = g_strdup(tokens[4]);
 182         candidate->port = atoi(tokens[5]);
 183
 184         if (sipe_strequal(tokens[7], "host"))
 185                 candidate->type = SIPE_CANDIDATE_TYPE_HOST;
 186         else if (sipe_strequal(tokens[7], "relay"))
 187                 candidate->type = SIPE_CANDIDATE_TYPE_RELAY;
 188         else if (sipe_strequal(tokens[7], "srflx"))
 189                 candidate->type = SIPE_CANDIDATE_TYPE_SRFLX;
 190         else if (sipe_strequal(tokens[7], "prflx"))
 191                 candidate->type = SIPE_CANDIDATE_TYPE_PRFLX;
 192         else {
 193                 sdpcandidate_free(candidate);
 194                 return candidates;
 195         }
 196
 197         return g_slist_append(candidates, candidate);
 198 }
 199
 200 static GSList *
 201 parse_candidates(GSList *attrs, SipeIceVersion *ice_version)
 202 {
 203         GSList *candidates = NULL;
 204         const gchar *attr;
 205         int i = 0;
 206
 207         while ((attr = sipe_utils_nameval_find_instance(attrs, "candidate", i++))) {
 208                 gchar **tokens = g_strsplit_set(attr, " ", 0);
 209
 210                 if (sipe_strequal(tokens[6], "typ")) {
 211                         candidates = parse_append_candidate_rfc_5245(tokens, candidates);
 212                         if (candidates)
 213                                 *ice_version = SIPE_ICE_RFC_5245;
 214                 } else {
 215                         candidates = parse_append_candidate_draft_6(tokens, candidates);
 216                         if (candidates)
 217                                 *ice_version = SIPE_ICE_DRAFT_6;
 218                 }
 219
 220                 g_strfreev(tokens);
 221         }
 222
 223         if (!candidates)
 224                 *ice_version = SIPE_ICE_NO_ICE;
 225
 226         if (*ice_version == SIPE_ICE_RFC_5245) {
 227                 const gchar *username = sipe_utils_nameval_find(attrs, "ice-ufrag");
 228                 const gchar *password = sipe_utils_nameval_find(attrs, "ice-pwd");
 229
 230                 if (username && password) {
 231                         GSList *i;
 232                         for (i = candidates; i; i = i->next) {
 233                                 struct sdpcandidate *c = i->data;
 234                                 c->username = g_strdup(username);
 235                                 c->password = g_strdup(password);
 236                         }
 237                 }
 238         }
 239
 240         return candidates;
 241 }
 242
 243 static GSList *
 244 create_legacy_candidates(gchar *ip, guint16 port)
 245 {
 246         struct sdpcandidate *candidate;
 247         GSList *candidates = NULL;
 248
 249         candidate = g_new0(struct sdpcandidate, 1);
 250         candidate->foundation = g_strdup("1");
 251         candidate->component = SIPE_COMPONENT_RTP;
 252         candidate->type = SIPE_CANDIDATE_TYPE_HOST;
 253         candidate->protocol = SIPE_NETWORK_PROTOCOL_UDP;
 254         candidate->ip = g_strdup(ip);
 255         candidate->port = port;
 256
 257         candidates = g_slist_append(candidates, candidate);
 258
 259         candidate = g_new0(struct sdpcandidate, 1);
 260         candidate->foundation = g_strdup("1");
 261         candidate->component = SIPE_COMPONENT_RTCP;
 262         candidate->type = SIPE_CANDIDATE_TYPE_HOST;
 263         candidate->protocol = SIPE_NETWORK_PROTOCOL_UDP;
 264         candidate->ip = g_strdup(ip);
 265         candidate->port = port + 1;
 266
 267         candidates = g_slist_append(candidates, candidate);
 268
 269         return candidates;
 270 }
 271
 272 static GSList *
 273 parse_codecs(GSList *attrs, SipeMediaType type)
 274 {
 275         int i = 0;
 276         const gchar *attr;
 277         GSList *codecs = NULL;
 278
 279         while ((attr = sipe_utils_nameval_find_instance(attrs, "rtpmap", i++))) {
 280                 struct sdpcodec *codec = g_new0(struct sdpcodec, 1);
 281                 gchar **tokens = g_strsplit_set(attr, " /", 3);
 282
 283                 int j = 0;
 284                 const gchar* params;
 285
 286                 codec->id = atoi(tokens[0]);
 287                 codec->name = g_strdup(tokens[1]);
 288                 codec->clock_rate = atoi(tokens[2]);
 289                 codec->type = type;
 290
 291                 // TODO: more secure and effective implementation
 292                 while((params = sipe_utils_nameval_find_instance(attrs, "fmtp", j++))) {
 293                         gchar **tokens = g_strsplit_set(params, " ", 0);
 294                         gchar **next = tokens + 1;
 295
 296                         if (atoi(tokens[0]) == codec->id) {
 297                                 while (*next) {
 298                                         gchar name[50];
 299                                         gchar value[50];
 300
 301                                         if (sscanf(*next, "%[a-zA-Z0-9]=%s", name, value) == 2)
 302                                                 codec->parameters = sipe_utils_nameval_add(codec->parameters, name, value);
 303
 304                                         ++next;
 305                                 }
 306                         }
 307
 308                         g_strfreev(tokens);
 309                 }
 310
 311                 codecs = g_slist_append(codecs, codec);
 312                 g_strfreev(tokens);
 313         }
 314
 315         return codecs;
 316 }
 317
 318 struct sdpmsg *
 319 sdpmsg_parse_msg(gchar *msg)
 320 {
 321         struct sdpmsg *smsg = g_new0(struct sdpmsg, 1);
 322         GSList *i;
 323
 324         if (!parse_attributes(smsg, msg)) {
 325                 sdpmsg_free(smsg);
 326                 return NULL;
 327         }
 328
 329         for (i = smsg->media; i; i = i->next) {
 330                 struct sdpmedia *media = i->data;
 331                 SipeMediaType type;
 332
 333                 media->candidates = parse_candidates(media->attributes,
 334                                                      &smsg->ice_version);
 335
 336                 if (!media->candidates && media->port != 0) {
 337                         // No a=candidate in SDP message, this seems to be MSOC 2005
 338                         media->candidates = create_legacy_candidates(smsg->ip, media->port);
 339                 }
 340
 341                 if (sipe_strequal(media->name, "audio"))
 342                         type = SIPE_MEDIA_AUDIO;
 343                 else if (sipe_strequal(media->name, "video"))
 344                         type = SIPE_MEDIA_VIDEO;
 345                 else {
 346                         // Unknown media type
 347                         sdpmsg_free(smsg);
 348                         return NULL;
 349                 }
 350
 351                 media->codecs = parse_codecs(media->attributes, type);
 352         }
 353
 354         return smsg;
 355 }
 356
 357 static gchar *
 358 codecs_to_string(GSList *codecs)
 359 {
 360         GString *result = g_string_new(NULL);
 361
 362         for (; codecs; codecs = codecs->next) {
 363                 struct sdpcodec *c = codecs->data;
 364                 GSList *params = c->parameters;
 365
 366                 g_string_append_printf(result,
 367                                        "a=rtpmap:%d %s/%d\r\n",
 368                                        c->id,
 369                                        c->name,
 370                                        c->clock_rate);
 371
 372                 if (params) {
 373                         GString *param_str = g_string_new(NULL);
 374                         int written_params = 0;
 375
 376                         g_string_append_printf(param_str, "a=fmtp:%d", c->id);
 377
 378                         for (; params; params = params->next) {
 379                                 struct sipnameval* par = params->data;
 380                                 if (sipe_strequal(par->name, "farsight-send-profile")) {
 381                                         // Lync AVMCU doesn't like this property.
 382                                         continue;
 383                                 }
 384
 385                                 g_string_append_printf(param_str, " %s=%s",
 386                                                        par->name, par->value);
 387                                 ++written_params;
 388                         }
 389
 390                         g_string_append(param_str, "\r\n");
 391
 392                         if (written_params > 0) {
 393                                 g_string_append(result, param_str->str);
 394                         }
 395
 396                         g_string_free(param_str, TRUE);
 397                 }
 398         }
 399
 400         return g_string_free(result, FALSE);
 401 }
 402
 403 static gchar *
 404 codec_ids_to_string(GSList *codecs)
 405 {
 406         GString *result = g_string_new(NULL);
 407
 408         for (; codecs; codecs = codecs->next) {
 409                 struct sdpcodec *c = codecs->data;
 410                 g_string_append_printf(result, " %d", c->id);
 411         }
 412
 413         return g_string_free(result, FALSE);
 414 }
 415
 416 static gchar *
 417 base64_unpad(const gchar *str)
 418 {
 419         gchar *result = g_strdup(str);
 420         gchar *ptr;
 421
 422         for (ptr = result + strlen(result); ptr != result; --ptr) {
 423                 if (*(ptr - 1) != '=') {
 424                         *ptr = '\0';
 425                         break;
 426                 }
 427         }
 428
 429         return result;
 430 }
 431
 432 static gchar *
 433 candidates_to_string(GSList *candidates, SipeIceVersion ice_version)
 434 {
 435         GString *result = g_string_new("");
 436         GSList *i;
 437         GSList *processed_tcp_candidates = NULL;
 438
 439         for (i = candidates; i; i = i->next) {
 440                 struct sdpcandidate *c = i->data;
 441                 const gchar *protocol;
 442                 const gchar *type;
 443                 gchar *related = NULL;
 444
 445                 if (ice_version == SIPE_ICE_RFC_5245) {
 446
 447                         switch (c->protocol) {
 448                                 case SIPE_NETWORK_PROTOCOL_TCP_ACTIVE:
 449                                         protocol = "TCP-ACT";
 450                                         break;
 451                                 case SIPE_NETWORK_PROTOCOL_TCP_PASSIVE:
 452                                         protocol = "TCP-PASS";
 453                                         break;
 454                                 case SIPE_NETWORK_PROTOCOL_UDP:
 455                                         protocol = "UDP";
 456                                         break;
 457                                 default:
 458                                         /* error unknown/unsupported type */
 459                                         protocol = "UNKNOWN";
 460                                         break;
 461                         }
 462
 463                         switch (c->type) {
 464                                 case SIPE_CANDIDATE_TYPE_HOST:
 465                                         type = "host";
 466                                         break;
 467                                 case SIPE_CANDIDATE_TYPE_RELAY:
 468                                         type = "relay";
 469                                         related = g_strdup_printf("raddr %s rport %d ",
 470                                                                   c->base_ip,
 471                                                                   c->base_port);
 472                                         break;
 473                                 case SIPE_CANDIDATE_TYPE_SRFLX:
 474                                         type = "srflx";
 475                                         related = g_strdup_printf("raddr %s rport %d",
 476                                                                   c->base_ip,
 477                                                                   c->base_port);
 478                                         break;
 479                                 case SIPE_CANDIDATE_TYPE_PRFLX:
 480                                         type = "prflx";
 481                                         break;
 482                                 default:
 483                                         /* error unknown/unsupported type */
 484                                         type = "unknown";
 485                                         break;
 486                         }
 487
 488                         g_string_append_printf(result,
 489                                                "a=candidate:%s %u %s %u %s %d typ %s %s\r\n",
 490                                                c->foundation,
 491                                                c->component,
 492                                                protocol,
 493                                                c->priority,
 494                                                c->ip,
 495                                                c->port,
 496                                                type,
 497                                                related ? related : "");
 498                         g_free(related);
 499
 500                 } else if (ice_version == SIPE_ICE_DRAFT_6) {
 501                         gchar *username;
 502                         gchar *password;
 503
 504                         switch (c->protocol) {
 505                                 case SIPE_NETWORK_PROTOCOL_TCP_ACTIVE:
 506                                 case SIPE_NETWORK_PROTOCOL_TCP_PASSIVE: {
 507                                         GSList *prev_cand = processed_tcp_candidates;
 508                                         for (; prev_cand; prev_cand = prev_cand->next) {
 509                                                 struct sdpcandidate *c2 = (struct sdpcandidate *)prev_cand->data;
 510
 511                                                 if (sipe_strequal(c->ip, c2->ip) &&
 512                                                     c->component == c2->component) {
 513                                                         break;
 514                                                 }
 515                                         }
 516
 517                                         if (prev_cand) {
 518                                                 protocol = NULL;
 519                                         } else {
 520                                                 protocol = "TCP";
 521                                                 processed_tcp_candidates =
 522                                                         g_slist_append(processed_tcp_candidates, c);
 523                                         }
 524                                         break;
 525                                 }
 526                                 case SIPE_NETWORK_PROTOCOL_UDP:
 527                                         protocol = "UDP";
 528                                         break;
 529                                 default:
 530                                         /* unknown/unsupported type, ignore */
 531                                         protocol = NULL;
 532                                         break;
 533                         }
 534
 535                         if (!protocol) {
 536                                 continue;
 537                         }
 538
 539                         username = base64_unpad(c->username);
 540                         password = base64_unpad(c->password);
 541
 542                         g_string_append_printf(result,
 543                                                "a=candidate:%s %u %s %s 0.%u %s %d\r\n",
 544                                                username,
 545                                                c->component,
 546                                                password,
 547                                                protocol,
 548                                                c->priority,
 549                                                c->ip,
 550                                                c->port);
 551
 552                         g_free(username);
 553                         g_free(password);
 554                 }
 555         }
 556
 557         g_slist_free(processed_tcp_candidates);
 558
 559         return g_string_free(result, FALSE);
 560 }
 561
 562 static gchar *
 563 remote_candidates_to_string(GSList *candidates, SipeIceVersion ice_version)
 564 {
 565         GString *result = g_string_new("");
 566
 567         if (candidates) {
 568                 if (ice_version == SIPE_ICE_RFC_5245) {
 569                         GSList *i;
 570                         g_string_append(result, "a=remote-candidates:");
 571
 572                         for (i = candidates; i; i = i->next) {
 573                                 struct sdpcandidate *c = i->data;
 574                                 g_string_append_printf(result, "%u %s %u ",
 575                                                        c->component, c->ip, c->port);
 576                         }
 577
 578                         g_string_append(result, "\r\n");
 579                 } else if (ice_version == SIPE_ICE_DRAFT_6) {
 580                         struct sdpcandidate *c = candidates->data;
 581                         g_string_append_printf(result, "a=remote-candidate:%s\r\n",
 582                                                c->username);
 583                 }
 584         }
 585
 586         return g_string_free(result, FALSE);
 587 }
 588
 589 static gchar *
 590 attributes_to_string(GSList *attributes)
 591 {
 592         GString *result = g_string_new("");
 593
 594         for (; attributes; attributes = attributes->next) {
 595                 struct sipnameval *a = attributes->data;
 596                 g_string_append_printf(result, "a=%s", a->name);
 597                 if (!sipe_strequal(a->value, ""))
 598                         g_string_append_printf(result, ":%s", a->value);
 599                 g_string_append(result, "\r\n");
 600         }
 601
 602         return g_string_free(result, FALSE);
 603 }
 604
 605 static gchar *
 606 media_to_string(const struct sdpmsg *msg, const struct sdpmedia *media)
 607 {
 608         gchar *media_str;
 609
 610         gchar *media_conninfo = NULL;
 611
 612         gchar *codecs_str = NULL;
 613         gchar *codec_ids_str = codec_ids_to_string(media->codecs);
 614
 615         gchar *candidates_str = NULL;
 616         gchar *remote_candidates_str = NULL;
 617
 618         gchar *tcp_setup_str = NULL;
 619         gchar *attributes_str = NULL;
 620         gchar *credentials = NULL;
 621
 622         gboolean uses_tcp_transport = FALSE;
 623
 624         if (media->port != 0) {
 625                 if (!sipe_strequal(msg->ip, media->ip)) {
 626                         media_conninfo = g_strdup_printf("c=IN IP4 %s\r\n", media->ip);
 627                 }
 628
 629                 codecs_str = codecs_to_string(media->codecs);
 630                 candidates_str = candidates_to_string(media->candidates, msg->ice_version);
 631                 remote_candidates_str = remote_candidates_to_string(media->remote_candidates,
 632                                                                     msg->ice_version);
 633
 634                 if (media->remote_candidates) {
 635                         struct sdpcandidate *c = media->remote_candidates->data;
 636                         uses_tcp_transport =
 637                                 c->protocol == SIPE_NETWORK_PROTOCOL_TCP_ACTIVE ||
 638                                 c->protocol == SIPE_NETWORK_PROTOCOL_TCP_PASSIVE;
 639                         if (uses_tcp_transport) {
 640                                 tcp_setup_str = g_strdup_printf(
 641                                         "a=connection:existing\r\n"
 642                                         "a=setup:%s\r\n",
 643                                         (c->protocol == SIPE_NETWORK_PROTOCOL_TCP_ACTIVE) ? "passive" : "active");
 644                         }
 645                 }
 646
 647                 attributes_str = attributes_to_string(media->attributes);
 648
 649                 if (msg->ice_version == SIPE_ICE_RFC_5245 && media->candidates) {
 650                         struct sdpcandidate *c = media->candidates->data;
 651
 652                         credentials = g_strdup_printf("a=ice-ufrag:%s\r\n"
 653                                                       "a=ice-pwd:%s\r\n",
 654                                                       c->username,
 655                                                       c->password);
 656                 }
 657         }
 658
 659         media_str = g_strdup_printf("m=%s %d %sRTP/AVP%s\r\n"
 660                                     "%s"
 661                                     "%s"
 662                                     "%s"
 663                                     "%s"
 664                                     "%s"
 665                                     "%s"
 666                                     "%s",
 667                                     media->name, media->port, uses_tcp_transport ? "TCP/" : "", codec_ids_str,
 668                                     media_conninfo ? media_conninfo : "",
 669                                     candidates_str ? candidates_str : "",
 670                                     remote_candidates_str ? remote_candidates_str : "",
 671                                     tcp_setup_str ? tcp_setup_str : "",
 672                                     codecs_str ? codecs_str : "",
 673                                     attributes_str ? attributes_str : "",
 674                                     credentials ? credentials : "");
 675
 676         g_free(media_conninfo);
 677         g_free(codecs_str);
 678         g_free(codec_ids_str);
 679         g_free(candidates_str);
 680         g_free(remote_candidates_str);
 681         g_free(tcp_setup_str);
 682         g_free(attributes_str);
 683         g_free(credentials);
 684
 685         return media_str;
 686 }
 687
 688 gchar *
 689 sdpmsg_to_string(const struct sdpmsg *msg)
 690 {
 691         GString *body = g_string_new(NULL);
 692         GSList *i;
 693
 694         g_string_append_printf(
 695                 body,
 696                 "v=0\r\n"
 697                 "o=- 0 0 IN IP4 %s\r\n"
 698                 "s=session\r\n"
 699                 "c=IN IP4 %s\r\n"
 700                 "b=CT:99980\r\n"
 701                 "t=0 0\r\n",
 702                 msg->ip, msg->ip);
 703
 704
 705         for (i = msg->media; i; i = i->next) {
 706                 gchar *media_str = media_to_string(msg, i->data);
 707                 g_string_append(body, media_str);
 708                 g_free(media_str);
 709         }
 710
 711         return g_string_free(body, FALSE);
 712 }
 713
 714 static struct sdpcandidate *
 715 sdpcandidate_copy(struct sdpcandidate *candidate)
 716 {
 717         if (candidate) {
 718                 struct sdpcandidate *copy = g_new0(struct sdpcandidate, 1);
 719
 720                 copy->foundation = g_strdup(candidate->foundation);
 721                 copy->component  = candidate->component;
 722                 copy->type       = candidate->type;
 723                 copy->protocol   = candidate->protocol;
 724                 copy->priority   = candidate->priority;
 725                 copy->ip         = g_strdup(candidate->ip);
 726                 copy->port       = candidate->port;
 727                 copy->base_ip    = g_strdup(candidate->base_ip);
 728                 copy->base_port  = candidate->base_port;
 729                 copy->username   = g_strdup(candidate->username);
 730                 copy->password   = g_strdup(candidate->password);
 731
 732                 return copy;
 733         } else
 734                 return NULL;
 735 }
 736
 737 static void
 738 sdpcandidate_free(struct sdpcandidate *candidate)
 739 {
 740         if (candidate) {
 741                 g_free(candidate->foundation);
 742                 g_free(candidate->ip);
 743                 g_free(candidate->base_ip);
 744                 g_free(candidate->username);
 745                 g_free(candidate->password);
 746                 g_free(candidate);
 747         }
 748 }
 749
 750 void
 751 sdpcodec_free(struct sdpcodec *codec)
 752 {
 753         if (codec) {
 754                 g_free(codec->name);
 755                 sipe_utils_nameval_free(codec->parameters);
 756                 g_free(codec);
 757         }
 758 }
 759
 760 void
 761 sdpmedia_free(struct sdpmedia *media)
 762 {
 763         if (media) {
 764                 g_free(media->name);
 765                 g_free(media->ip);
 766
 767                 sipe_utils_nameval_free(media->attributes);
 768
 769                 sipe_utils_slist_free_full(media->candidates,
 770                                   (GDestroyNotify) sdpcandidate_free);
 771                 sipe_utils_slist_free_full(media->codecs,
 772                                   (GDestroyNotify) sdpcodec_free);
 773                 sipe_utils_slist_free_full(media->remote_candidates,
 774                                   (GDestroyNotify) sdpcandidate_free);
 775
 776                 g_free(media);
 777         }
 778 }
 779
 780 void
 781 sdpmsg_free(struct sdpmsg *msg)
 782 {
 783         if (msg) {
 784                 g_free(msg->ip);
 785                 sipe_utils_slist_free_full(msg->media,
 786                                   (GDestroyNotify) sdpmedia_free);
 787                 g_free(msg);
 788         }
 789 }
 790
 791 /*
 792   Local Variables:
 793   mode: c
 794   c-file-style: "bsd"
 795   indent-tabs-mode: t
 796   tab-width: 8
 797   End:
 798 */