src/core/sipe-appshare.c

   1 /**
   2  * @file sipe-appshare.c
   3  *
   4  * pidgin-sipe
   5  *
   6  * Copyright (C) 2014-2017 SIPE Project <http://sipe.sourceforge.net/>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include <glib.h>
  24 #include <string.h>
  25
  26 #include <gio/gio.h>
  27
  28 #include "sipmsg.h"
  29 #include "sipe-appshare.h"
  30 #include "sipe-appshare-client.h"
  31 #include "sipe-backend.h"
  32 #include "sipe-buddy.h"
  33 #include "sipe-chat.h"
  34 #include "sipe-common.h"
  35 #include "sipe-conf.h"
  36 #include "sipe-core.h"
  37 #include "sipe-core-private.h"
  38 #include "sipe-media.h"
  39 #include "sipe-nls.h"
  40 #include "sipe-schedule.h"
  41 #include "sipe-user.h"
  42 #include "sipe-utils.h"
  43 #include "sdpmsg.h"
  44
  45 struct sipe_appshare {
  46         struct sipe_media_stream *stream;
  47         GSocket *socket;
  48         GIOChannel *channel;
  49         guint rdp_channel_readable_watch_id;
  50         guint rdp_channel_writable_watch_id;
  51         struct sipe_user_ask_ctx *ask_ctx;
  52
  53         gchar rdp_channel_buffer[0x800];
  54         gchar *rdp_channel_buffer_pos;
  55         gsize rdp_channel_buffer_len;
  56
  57         struct sipe_rdp_client client;
  58 };
  59
  60 static void
  61 sipe_appshare_free(struct sipe_appshare *appshare)
  62 {
  63         if (appshare->rdp_channel_readable_watch_id != 0) {
  64                 g_source_destroy(g_main_context_find_source_by_id(NULL,
  65                                 appshare->rdp_channel_readable_watch_id));
  66         }
  67
  68         if (appshare->rdp_channel_writable_watch_id != 0) {
  69                 g_source_destroy(g_main_context_find_source_by_id(NULL,
  70                                 appshare->rdp_channel_writable_watch_id));
  71         }
  72
  73         if (appshare->channel) {
  74                 GError *error = NULL;
  75
  76                 g_io_channel_shutdown(appshare->channel, TRUE, &error);
  77                 if (error) {
  78                         SIPE_DEBUG_ERROR("Error shutting down RDP channel: %s",
  79                                          error->message);
  80                         g_error_free(error);
  81                 }
  82                 g_io_channel_unref(appshare->channel);
  83         }
  84
  85         if (appshare->socket) {
  86                 g_object_unref(appshare->socket);
  87         }
  88
  89         if (appshare->ask_ctx) {
  90                 sipe_user_close_ask(appshare->ask_ctx);
  91         }
  92
  93         g_free(appshare->client.cmdline);
  94         if (appshare->client.free_cb) {
  95                 appshare->client.free_cb(&appshare->client);
  96         }
  97
  98         g_free(appshare);
  99 }
 100
 101 static gboolean
 102 rdp_channel_readable_cb(GIOChannel *channel,
 103                         GIOCondition condition,
 104                         gpointer data)
 105 {
 106         struct sipe_appshare *appshare = data;
 107         GError *error = NULL;
 108         gchar *buffer;
 109         gsize bytes_read;
 110
 111         if (condition & G_IO_HUP) {
 112                 struct sipe_media_call *call = appshare->stream->call;
 113
 114                 sipe_backend_media_hangup(call->backend_private, TRUE);
 115                 return FALSE;
 116         }
 117
 118         buffer = g_malloc(2048);
 119         while (sipe_media_stream_is_writable(appshare->stream)) {
 120                 GIOStatus status;
 121
 122                 status = g_io_channel_read_chars(channel,
 123                                                  buffer, 2048,
 124                                                  &bytes_read, &error);
 125                 if (error) {
 126                         struct sipe_media_call *call = appshare->stream->call;
 127
 128                         SIPE_DEBUG_ERROR("Error reading from RDP channel: %s",
 129                                          error->message);
 130                         g_error_free(error);
 131                         sipe_backend_media_hangup(call->backend_private, TRUE);
 132                         g_free(buffer);
 133                         return FALSE;
 134                 }
 135
 136                 if (status == G_IO_STATUS_EOF) {
 137                         struct sipe_media_call *call = appshare->stream->call;
 138
 139                         sipe_backend_media_hangup(call->backend_private, TRUE);
 140                         g_free(buffer);
 141                         return FALSE;
 142                 }
 143
 144                 if (bytes_read == 0) {
 145                         break;
 146                 }
 147
 148                 sipe_media_stream_write(appshare->stream, (guint8 *)buffer,
 149                                         bytes_read);
 150                 SIPE_DEBUG_INFO("Written: %" G_GSIZE_FORMAT "\n", bytes_read);
 151         }
 152         g_free(buffer);
 153
 154         return TRUE;
 155 }
 156
 157 static gboolean
 158 socket_connect_cb(SIPE_UNUSED_PARAMETER GIOChannel *channel,
 159                   SIPE_UNUSED_PARAMETER GIOCondition condition,
 160                   gpointer data)
 161 {
 162         struct sipe_appshare *appshare = data;
 163         GError *error = NULL;
 164         GSocket *data_socket;
 165         int fd;
 166
 167         data_socket = g_socket_accept(appshare->socket, NULL, &error);
 168         if (error) {
 169                 struct sipe_media_call *call = appshare->stream->call;
 170
 171                 SIPE_DEBUG_ERROR("Error accepting RDP client connection: %s",
 172                                  error->message);
 173                 g_error_free(error);
 174                 sipe_backend_media_hangup(call->backend_private, TRUE);
 175                 return FALSE;
 176         }
 177
 178         g_io_channel_shutdown(appshare->channel, TRUE, &error);
 179         if (error) {
 180                 struct sipe_media_call *call = appshare->stream->call;
 181
 182                 SIPE_DEBUG_ERROR("Error shutting down RDP channel: %s",
 183                                  error->message);
 184                 g_error_free(error);
 185                 g_object_unref(data_socket);
 186                 sipe_backend_media_hangup(call->backend_private, TRUE);
 187                 return FALSE;
 188         }
 189         g_io_channel_unref(appshare->channel);
 190
 191         g_object_unref(appshare->socket);
 192         appshare->socket = data_socket;
 193
 194         fd = g_socket_get_fd(appshare->socket);
 195         if (fd < 0) {
 196                 struct sipe_media_call *call = appshare->stream->call;
 197
 198                 SIPE_DEBUG_ERROR_NOFORMAT("Invalid file descriptor for RDP client connection socket");
 199                 sipe_backend_media_hangup(call->backend_private, TRUE);
 200                 return FALSE;
 201         }
 202         appshare->channel = g_io_channel_unix_new(fd);
 203
 204         // No encoding for binary data
 205         g_io_channel_set_encoding(appshare->channel, NULL, &error);
 206         if (error) {
 207                 struct sipe_media_call *call = appshare->stream->call;
 208
 209                 SIPE_DEBUG_ERROR("Error setting RDP channel encoding: %s",
 210                                  error->message);
 211                 g_error_free(error);
 212                 sipe_backend_media_hangup(call->backend_private, TRUE);
 213                 return FALSE;
 214         }
 215
 216         appshare->rdp_channel_readable_watch_id =
 217                         g_io_add_watch(appshare->channel, G_IO_IN | G_IO_HUP,
 218                                        rdp_channel_readable_cb, appshare);
 219
 220         return FALSE;
 221 }
 222
 223 static void
 224 launch_rdp_client(struct sipe_appshare *appshare)
 225 {
 226         struct sipe_rdp_client *client = &appshare->client;
 227         struct sipe_media_call *call = appshare->stream->call;
 228         GSocketAddress *address;
 229         GError *error = NULL;
 230         int fd;
 231
 232         address = client->get_listen_address_cb(client);
 233         if (!address) {
 234                 sipe_backend_media_hangup(call->backend_private, TRUE);
 235                 return;
 236         }
 237
 238         appshare->socket = g_socket_new(g_socket_address_get_family(address),
 239                                         G_SOCKET_TYPE_STREAM,
 240                                         G_SOCKET_PROTOCOL_DEFAULT,
 241                                         &error);
 242         if (error) {
 243                 SIPE_DEBUG_ERROR("Can't create RDP client listen socket: %s",
 244                                  error->message);
 245                 g_error_free(error);
 246                 g_object_unref(address);
 247                 sipe_backend_media_hangup(call->backend_private, TRUE);
 248                 return;
 249         }
 250
 251         g_socket_set_blocking(appshare->socket, FALSE);
 252
 253         g_socket_bind(appshare->socket, address, TRUE, &error);
 254         g_object_unref(address);
 255         if (error) {
 256                 SIPE_DEBUG_ERROR("Can't bind to RDP client socket: %s",
 257                                  error->message);
 258                 g_error_free(error);
 259                 sipe_backend_media_hangup(call->backend_private, TRUE);
 260                 return;
 261         }
 262
 263         g_socket_listen(appshare->socket, &error);
 264         if (error) {
 265                 SIPE_DEBUG_ERROR("Can't listen on RDP client socket: %s",
 266                                  error->message);
 267                 g_error_free(error);
 268                 sipe_backend_media_hangup(call->backend_private, TRUE);
 269                 return;
 270         }
 271
 272         fd = g_socket_get_fd(appshare->socket);
 273         if (fd < 0) {
 274                 SIPE_DEBUG_ERROR_NOFORMAT("Invalid file descriptor for RDP client listen socket");
 275                 sipe_backend_media_hangup(call->backend_private, TRUE);
 276                 return;
 277         }
 278         appshare->channel = g_io_channel_unix_new(fd);
 279
 280         appshare->rdp_channel_readable_watch_id =
 281                         g_io_add_watch(appshare->channel, G_IO_IN,
 282                                        socket_connect_cb, appshare);
 283
 284         address = g_socket_get_local_address(appshare->socket, &error);
 285         if (error) {
 286                 SIPE_DEBUG_ERROR("Couldn't get appshare socket address: %s",
 287                                  error->message);
 288                 g_error_free(error);
 289                 sipe_backend_media_hangup(call->backend_private, TRUE);
 290                 return;
 291         }
 292
 293         if (!client->launch_cb(client, address, appshare->stream)) {
 294                 sipe_backend_media_hangup(call->backend_private, TRUE);
 295         }
 296
 297         g_object_unref(address);
 298 }
 299
 300 static gssize
 301 rdp_client_channel_write(struct sipe_appshare *appshare)
 302 {
 303         gsize bytes_written;
 304         GError *error = NULL;
 305
 306         g_io_channel_write_chars(appshare->channel,
 307                                  appshare->rdp_channel_buffer_pos,
 308                                  appshare->rdp_channel_buffer_len,
 309                                  &bytes_written, &error);
 310         if (error) {
 311                 SIPE_DEBUG_ERROR("Couldn't write data to RDP client: %s",
 312                                  error->message);
 313                 g_error_free(error);
 314                 return -1;
 315         }
 316
 317         g_io_channel_flush(appshare->channel, &error);
 318         if (error) {
 319                 if (g_error_matches(error, G_IO_CHANNEL_ERROR,
 320                                     G_IO_CHANNEL_ERROR_PIPE)) {
 321                         /* Ignore broken pipe here and wait for the call to be
 322                          * hung up upon G_IO_HUP in client_channel_cb(). */
 323                         g_error_free(error);
 324                         return 0;
 325                 }
 326
 327                 SIPE_DEBUG_ERROR("Couldn't flush RDP channel: %s",
 328                                  error->message);
 329                 g_error_free(error);
 330                 return -1;
 331         }
 332
 333         appshare->rdp_channel_buffer_pos += bytes_written;
 334         appshare->rdp_channel_buffer_len -= bytes_written;
 335
 336         return bytes_written;
 337 }
 338
 339 static void
 340 delayed_hangup_cb(SIPE_UNUSED_PARAMETER struct sipe_core_private *sipe_private,
 341                   gpointer data)
 342 {
 343         struct sipe_media_call *call = data;
 344
 345         sipe_backend_media_hangup(call->backend_private, TRUE);
 346 }
 347
 348 static gboolean
 349 rdp_channel_writable_cb(SIPE_UNUSED_PARAMETER GIOChannel *channel,
 350                         SIPE_UNUSED_PARAMETER GIOCondition condition,
 351                         gpointer data)
 352 {
 353         struct sipe_appshare *appshare = data;
 354         struct sipe_media_call *call = appshare->stream->call;
 355
 356         if (rdp_client_channel_write(appshare) < 0) {
 357                 sipe_backend_media_hangup(call->backend_private, TRUE);
 358                 return FALSE;
 359         }
 360
 361         if (appshare->rdp_channel_buffer_len == 0) {
 362                 // Writing done, disconnect writable watch.
 363                 appshare->rdp_channel_writable_watch_id = 0;
 364                 return FALSE;
 365         }
 366
 367         return TRUE;
 368 }
 369
 370 static void
 371 read_cb(struct sipe_media_stream *stream)
 372 {
 373         struct sipe_appshare *appshare = sipe_media_stream_get_data(stream);
 374         gint bytes_read = 0;
 375         gssize bytes_written = 0;
 376
 377         if (appshare->rdp_channel_writable_watch_id != 0) {
 378                 // Data still in the buffer. Let the client read it first.
 379                 return;
 380         }
 381
 382         while (bytes_read == (gint)bytes_written) {
 383                 bytes_read = sipe_backend_media_stream_read(stream,
 384                                 (guint8 *)appshare->rdp_channel_buffer,
 385                                 sizeof (appshare->rdp_channel_buffer));
 386                 if (bytes_read == 0) {
 387                         return;
 388                 }
 389
 390                 appshare->rdp_channel_buffer_pos = appshare->rdp_channel_buffer;
 391                 appshare->rdp_channel_buffer_len = bytes_read;
 392
 393                 bytes_written = rdp_client_channel_write(appshare);
 394
 395                 if (bytes_written < 0) {
 396                         /* Don't deallocate stream while in its read callback.
 397                          * Schedule call hangup to be executed after we're back
 398                          * in the message loop. */
 399                         sipe_schedule_seconds(sipe_media_get_sipe_core_private(stream->call),
 400                                               "appshare delayed hangup",
 401                                               stream->call->backend_private,
 402                                               0,
 403                                               delayed_hangup_cb,
 404                                               NULL);
 405                         return;
 406                 }
 407         }
 408
 409         if (bytes_read != (gint)bytes_written) {
 410                 /* Schedule writing of the buffer's remainder to when
 411                  * RDP channel becomes writable again. */
 412                 appshare->rdp_channel_writable_watch_id =
 413                                 g_io_add_watch(appshare->channel, G_IO_OUT,
 414                                                rdp_channel_writable_cb,
 415                                                appshare);
 416         }
 417 }
 418
 419 static void
 420 writable_cb(struct sipe_media_stream *stream)
 421 {
 422         struct sipe_appshare *appshare = sipe_media_stream_get_data(stream);
 423
 424         if (!appshare->socket) {
 425                 launch_rdp_client(appshare);
 426         }
 427 }
 428
 429 static void
 430 accept_cb(SIPE_UNUSED_PARAMETER struct sipe_core_private *sipe_private,
 431           gpointer data)
 432 {
 433         struct sipe_appshare *appshare = data;
 434         appshare->ask_ctx = NULL;
 435
 436         sipe_backend_media_accept(appshare->stream->call->backend_private, TRUE);
 437 }
 438
 439 static void
 440 decline_cb(SIPE_UNUSED_PARAMETER struct sipe_core_private *sipe_private,
 441           gpointer data)
 442 {
 443         struct sipe_appshare *appshare = data;
 444         appshare->ask_ctx = NULL;
 445
 446         sipe_backend_media_hangup(appshare->stream->call->backend_private, TRUE);
 447 }
 448
 449 static struct sipe_user_ask_ctx *
 450 ask_accept_applicationsharing(struct sipe_core_private *sipe_private,
 451                               const gchar *from,
 452                               SipeUserAskCb accept_cb,
 453                               SipeUserAskCb decline_cb,
 454                               gpointer user_data)
 455 {
 456         struct sipe_user_ask_ctx *ctx;
 457         gchar *alias = sipe_buddy_get_alias(sipe_private, from);
 458         gchar *ask_msg = g_strdup_printf(_("%s wants to start presenting"),
 459                                          alias ? alias : from);
 460
 461         ctx = sipe_user_ask(sipe_private, ask_msg,
 462                              _("Accept"), accept_cb,
 463                              _("Decline"), decline_cb,
 464                              user_data);
 465
 466         g_free(ask_msg);
 467         g_free(alias);
 468
 469         return ctx;
 470 }
 471
 472 static struct sipe_appshare *
 473 initialize_appshare(struct sipe_media_stream *stream)
 474 {
 475         struct sipe_appshare *appshare;
 476         struct sipe_media_call *call;
 477         struct sipe_core_private *sipe_private;
 478         const gchar *cmdline;
 479
 480         call = stream->call;
 481         sipe_private = sipe_media_get_sipe_core_private(call);
 482
 483         appshare = g_new0(struct sipe_appshare, 1);
 484         appshare->stream = stream;
 485
 486         sipe_media_stream_set_data(stream, appshare,
 487                                    (GDestroyNotify)sipe_appshare_free);
 488
 489         cmdline = sipe_backend_setting(SIPE_CORE_PUBLIC,
 490                                        SIPE_SETTING_RDP_CLIENT);
 491         if (is_empty(cmdline))
 492                 cmdline = "remmina";
 493         appshare->client.cmdline = g_strdup(cmdline);
 494
 495         if (strstr(cmdline, "xfreerdp")) {
 496                 sipe_appshare_xfreerdp_init(&appshare->client);
 497         } else if (strstr(cmdline, "remmina")) {
 498                 sipe_appshare_remmina_init(&appshare->client);
 499         } else {
 500                 sipe_backend_notify_error(SIPE_CORE_PUBLIC,
 501                                           _("Application sharing error"),
 502                                           _("Unknown remote desktop client configured."));
 503                 sipe_backend_media_hangup(call->backend_private, TRUE);
 504                 return NULL;
 505         }
 506
 507         sipe_media_stream_add_extra_attribute(stream,
 508                         "x-applicationsharing-session-id", "1");
 509         sipe_media_stream_add_extra_attribute(stream,
 510                         "x-applicationsharing-role", "viewer");
 511         sipe_media_stream_add_extra_attribute(stream,
 512                         "x-applicationsharing-media-type", "rdp");
 513
 514         stream->read_cb = read_cb;
 515         stream->writable_cb = writable_cb;
 516
 517         return appshare;
 518 }
 519
 520 void
 521 process_incoming_invite_appshare(struct sipe_core_private *sipe_private,
 522                                  struct sipmsg *msg)
 523 {
 524         struct sipe_media_call *call;
 525         struct sipe_media_stream *stream;
 526         struct sipe_appshare *appshare;
 527         struct sdpmsg *sdpmsg;
 528         GSList *i;
 529
 530         sdpmsg = sdpmsg_parse_msg(msg->body);
 531
 532         /* Skype for Business compatibility - ignore desktop video. */
 533         i = sdpmsg->media;
 534         while (i) {
 535                 struct sdpmedia *media = i->data;
 536                 const gchar *label;
 537
 538                 i = i->next;
 539
 540                 label = sipe_utils_nameval_find(media->attributes, "label");
 541
 542                 if (sipe_strequal(media->name, "video") &&
 543                     sipe_strequal(label, "applicationsharing-video")) {
 544                         sdpmsg->media = g_slist_remove(sdpmsg->media, media);
 545                         sdpmedia_free(media);
 546                 }
 547         }
 548
 549         call = process_incoming_invite_call(sipe_private, msg, sdpmsg);
 550         if (!call) {
 551                 return;
 552         }
 553
 554         stream = sipe_core_media_get_stream_by_id(call, "applicationsharing");
 555         if (!stream) {
 556                 sipe_backend_media_hangup(call->backend_private, TRUE);
 557                 return;
 558         }
 559
 560         appshare = initialize_appshare(stream);
 561
 562         if (appshare) {
 563                 gchar *from;
 564
 565                 from = parse_from(sipmsg_find_header(msg, "From"));
 566                 appshare->ask_ctx = ask_accept_applicationsharing(sipe_private, from,
 567                                                                   accept_cb,
 568                                                                   decline_cb,
 569                                                                   appshare);
 570                 g_free(from);
 571         }
 572 }
 573
 574 static void
 575 connect_conference(struct sipe_core_private *sipe_private,
 576                    struct sipe_chat_session *chat_session)
 577 {
 578         struct sipe_media_call *call;
 579         struct sipe_media_stream *stream;
 580         gchar * uri;
 581
 582         chat_session->appshare_ask_ctx = NULL;
 583
 584         uri = sipe_conf_build_uri(chat_session->id, "applicationsharing");
 585
 586         call = sipe_media_call_new(sipe_private, uri, NULL,
 587                                    SIPE_ICE_RFC_5245,
 588                                    SIPE_MEDIA_CALL_NO_UI);
 589
 590         g_free(uri);
 591
 592         stream = sipe_media_stream_add(call, "applicationsharing",
 593                                        SIPE_MEDIA_APPLICATION,
 594                                        SIPE_ICE_RFC_5245, TRUE, 0);
 595         if (!stream) {
 596                 sipe_backend_notify_error(SIPE_CORE_PUBLIC,
 597                                           _("Application sharing error"),
 598                                           _("Couldn't connect application sharing"));
 599                 sipe_backend_media_hangup(call->backend_private, FALSE);
 600         }
 601
 602         sipe_media_stream_add_extra_attribute(stream, "connection", "new");
 603         sipe_media_stream_add_extra_attribute(stream, "setup", "active");
 604
 605         initialize_appshare(stream);
 606 }
 607
 608 void
 609 sipe_core_appshare_connect_conference(struct sipe_core_public *sipe_public,
 610                                       struct sipe_chat_session *chat_session,
 611                                       gboolean user_must_accept)
 612 {
 613         if (user_must_accept) {
 614                 const gchar *from;
 615
 616                 if (chat_session->appshare_ask_ctx) {
 617                         // Accept dialog already opened.
 618                         return;
 619                 }
 620
 621                 if (chat_session->title) {
 622                         from = chat_session->title;
 623                 } else if (chat_session->organizer) {
 624                         from = chat_session->organizer;
 625                 } else {
 626                         from = chat_session->id;
 627                 }
 628
 629                 chat_session->appshare_ask_ctx =
 630                                 ask_accept_applicationsharing(SIPE_CORE_PRIVATE,
 631                                                               from,
 632                                                               (SipeUserAskCb)connect_conference,
 633                                                               NULL,
 634                                                               chat_session);
 635         } else {
 636                 connect_conference(SIPE_CORE_PRIVATE, chat_session);
 637         }
 638 }
 639
 640 /*
 641   Local Variables:
 642   mode: c
 643   c-file-style: "bsd"
 644   indent-tabs-mode: t
 645   tab-width: 8
 646   End:
 647 */