profiles/network/server.c

   1 /*
   2  *
   3  *  BlueZ - Bluetooth protocol stack for Linux
   4  *
   5  *  Copyright (C) 2004-2010  Marcel Holtmann <marcel@holtmann.org>
   6  *
   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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  21  *
  22  */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <stdio.h>
  29 #include <unistd.h>
  30 #include <stdlib.h>
  31 #include <errno.h>
  32
  33 #include <bluetooth/bluetooth.h>
  34 #include <bluetooth/bnep.h>
  35 #include <bluetooth/sdp.h>
  36 #include <bluetooth/sdp_lib.h>
  37 #include <netinet/in.h>
  38
  39 #include <glib.h>
  40 #include <gdbus/gdbus.h>
  41
  42 #include "btio/btio.h"
  43 #include "lib/uuid.h"
  44 #include "src/dbus-common.h"
  45 #include "src/adapter.h"
  46 #include "src/log.h"
  47 #include "src/error.h"
  48 #include "src/sdpd.h"
  49
  50 #include "bnep.h"
  51 #include "server.h"
  52
  53 #define NETWORK_SERVER_INTERFACE "org.bluez.NetworkServer1"
  54 #define BNEP_INTERFACE "bnep%d"
  55 #define SETUP_TIMEOUT           1
  56
  57 /* Pending Authorization */
  58 struct network_session {
  59         bdaddr_t        dst;            /* Remote Bluetooth Address */
  60         char            dev[16];        /* Interface name */
  61         GIOChannel      *io;            /* Pending connect channel */
  62         guint           watch;          /* BNEP socket watch */
  63 };
  64
  65 struct network_adapter {
  66         struct btd_adapter *adapter;    /* Adapter pointer */
  67         GIOChannel      *io;            /* Bnep socket */
  68         struct network_session *setup;  /* Setup in progress */
  69         GSList          *servers;       /* Server register to adapter */
  70 };
  71
  72 /* Main server structure */
  73 struct network_server {
  74         bdaddr_t        src;            /* Bluetooth Local Address */
  75         char            *name;          /* Server service name */
  76         char            *bridge;        /* Bridge name */
  77         uint32_t        record_id;      /* Service record id */
  78         uint16_t        id;             /* Service class identifier */
  79         GSList          *sessions;      /* Active connections */
  80         struct network_adapter *na;     /* Adapter reference */
  81         guint           watch_id;       /* Client service watch */
  82 };
  83
  84 static GSList *adapters = NULL;
  85 static gboolean security = TRUE;
  86
  87 static struct network_adapter *find_adapter(GSList *list,
  88                                         struct btd_adapter *adapter)
  89 {
  90         for (; list; list = list->next) {
  91                 struct network_adapter *na = list->data;
  92
  93                 if (na->adapter == adapter)
  94                         return na;
  95         }
  96
  97         return NULL;
  98 }
  99
 100 static struct network_server *find_server(GSList *list, uint16_t id)
 101 {
 102         for (; list; list = list->next) {
 103                 struct network_server *ns = list->data;
 104
 105                 if (ns->id == id)
 106                         return ns;
 107         }
 108
 109         return NULL;
 110 }
 111
 112 static struct network_server *find_server_by_uuid(GSList *list,
 113                                                         const char *uuid)
 114 {
 115         for (; list; list = list->next) {
 116                 struct network_server *ns = list->data;
 117
 118                 if (strcasecmp(uuid, bnep_uuid(ns->id)) == 0)
 119                         return ns;
 120
 121                 if (strcasecmp(uuid, bnep_name(ns->id)) == 0)
 122                         return ns;
 123         }
 124
 125         return NULL;
 126 }
 127
 128 static sdp_record_t *server_record_new(const char *name, uint16_t id)
 129 {
 130         sdp_list_t *svclass, *pfseq, *apseq, *root, *aproto;
 131         uuid_t root_uuid, pan, l2cap, bnep;
 132         sdp_profile_desc_t profile[1];
 133         sdp_list_t *proto[2];
 134         sdp_data_t *v, *p;
 135         uint16_t psm = BNEP_PSM, version = 0x0100;
 136         uint16_t security_desc = (security ? 0x0001 : 0x0000);
 137         uint16_t net_access_type = 0xfffe;
 138         uint32_t max_net_access_rate = 0;
 139         const char *desc = "Network service";
 140         sdp_record_t *record;
 141
 142         record = sdp_record_alloc();
 143         if (!record)
 144                 return NULL;
 145
 146         record->attrlist = NULL;
 147         record->pattern = NULL;
 148
 149         switch (id) {
 150         case BNEP_SVC_NAP:
 151                 sdp_uuid16_create(&pan, NAP_SVCLASS_ID);
 152                 svclass = sdp_list_append(NULL, &pan);
 153                 sdp_set_service_classes(record, svclass);
 154
 155                 sdp_uuid16_create(&profile[0].uuid, NAP_PROFILE_ID);
 156                 profile[0].version = 0x0100;
 157                 pfseq = sdp_list_append(NULL, &profile[0]);
 158                 sdp_set_profile_descs(record, pfseq);
 159
 160                 sdp_set_info_attr(record, name, NULL, desc);
 161
 162                 sdp_attr_add_new(record, SDP_ATTR_NET_ACCESS_TYPE,
 163                                         SDP_UINT16, &net_access_type);
 164                 sdp_attr_add_new(record, SDP_ATTR_MAX_NET_ACCESSRATE,
 165                                         SDP_UINT32, &max_net_access_rate);
 166                 break;
 167         case BNEP_SVC_GN:
 168                 sdp_uuid16_create(&pan, GN_SVCLASS_ID);
 169                 svclass = sdp_list_append(NULL, &pan);
 170                 sdp_set_service_classes(record, svclass);
 171
 172                 sdp_uuid16_create(&profile[0].uuid, GN_PROFILE_ID);
 173                 profile[0].version = 0x0100;
 174                 pfseq = sdp_list_append(NULL, &profile[0]);
 175                 sdp_set_profile_descs(record, pfseq);
 176
 177                 sdp_set_info_attr(record, name, NULL, desc);
 178                 break;
 179         case BNEP_SVC_PANU:
 180                 sdp_uuid16_create(&pan, PANU_SVCLASS_ID);
 181                 svclass = sdp_list_append(NULL, &pan);
 182                 sdp_set_service_classes(record, svclass);
 183
 184                 sdp_uuid16_create(&profile[0].uuid, PANU_PROFILE_ID);
 185                 profile[0].version = 0x0100;
 186                 pfseq = sdp_list_append(NULL, &profile[0]);
 187                 sdp_set_profile_descs(record, pfseq);
 188
 189                 sdp_set_info_attr(record, name, NULL, desc);
 190                 break;
 191         default:
 192                 sdp_record_free(record);
 193                 return NULL;
 194         }
 195
 196         sdp_uuid16_create(&root_uuid, PUBLIC_BROWSE_GROUP);
 197         root = sdp_list_append(NULL, &root_uuid);
 198         sdp_set_browse_groups(record, root);
 199
 200         sdp_uuid16_create(&l2cap, L2CAP_UUID);
 201         proto[0] = sdp_list_append(NULL, &l2cap);
 202         p = sdp_data_alloc(SDP_UINT16, &psm);
 203         proto[0] = sdp_list_append(proto[0], p);
 204         apseq    = sdp_list_append(NULL, proto[0]);
 205
 206         sdp_uuid16_create(&bnep, BNEP_UUID);
 207         proto[1] = sdp_list_append(NULL, &bnep);
 208         v = sdp_data_alloc(SDP_UINT16, &version);
 209         proto[1] = sdp_list_append(proto[1], v);
 210
 211         /* Supported protocols */
 212         {
 213                 uint16_t ptype[] = {
 214                         0x0800,  /* IPv4 */
 215                         0x0806,  /* ARP */
 216                 };
 217                 sdp_data_t *head, *pseq;
 218                 int p;
 219
 220                 for (p = 0, head = NULL; p < 2; p++) {
 221                         sdp_data_t *data = sdp_data_alloc(SDP_UINT16, &ptype[p]);
 222                         if (head)
 223                                 sdp_seq_append(head, data);
 224                         else
 225                                 head = data;
 226                 }
 227                 pseq = sdp_data_alloc(SDP_SEQ16, head);
 228                 proto[1] = sdp_list_append(proto[1], pseq);
 229         }
 230
 231         apseq = sdp_list_append(apseq, proto[1]);
 232
 233         aproto = sdp_list_append(NULL, apseq);
 234         sdp_set_access_protos(record, aproto);
 235
 236         sdp_add_lang_attr(record);
 237
 238         sdp_attr_add_new(record, SDP_ATTR_SECURITY_DESC,
 239                                 SDP_UINT16, &security_desc);
 240
 241         sdp_data_free(p);
 242         sdp_data_free(v);
 243         sdp_list_free(apseq, NULL);
 244         sdp_list_free(root, NULL);
 245         sdp_list_free(aproto, NULL);
 246         sdp_list_free(proto[0], NULL);
 247         sdp_list_free(proto[1], NULL);
 248         sdp_list_free(svclass, NULL);
 249         sdp_list_free(pfseq, NULL);
 250
 251         return record;
 252 }
 253
 254 static void session_free(void *data)
 255 {
 256         struct network_session *session = data;
 257
 258         if (session->watch)
 259                 g_source_remove(session->watch);
 260
 261         if (session->io)
 262                 g_io_channel_unref(session->io);
 263
 264         g_free(session);
 265 }
 266
 267 static void setup_destroy(void *user_data)
 268 {
 269         struct network_adapter *na = user_data;
 270         struct network_session *setup = na->setup;
 271
 272         if (!setup)
 273                 return;
 274
 275         na->setup = NULL;
 276
 277         session_free(setup);
 278 }
 279
 280 static gboolean bnep_setup(GIOChannel *chan,
 281                         GIOCondition cond, gpointer user_data)
 282 {
 283         struct network_adapter *na = user_data;
 284         struct network_server *ns;
 285         uint8_t packet[BNEP_MTU];
 286         struct bnep_setup_conn_req *req = (void *) packet;
 287         uint16_t src_role, dst_role, rsp = BNEP_CONN_NOT_ALLOWED;
 288         int n, sk;
 289
 290         if (cond & G_IO_NVAL)
 291                 return FALSE;
 292
 293         if (cond & (G_IO_ERR | G_IO_HUP)) {
 294                 error("Hangup or error on BNEP socket");
 295                 return FALSE;
 296         }
 297
 298         sk = g_io_channel_unix_get_fd(chan);
 299
 300         /* Reading BNEP_SETUP_CONNECTION_REQUEST_MSG */
 301         n = read(sk, packet, sizeof(packet));
 302         if (n < 0) {
 303                 error("read(): %s(%d)", strerror(errno), errno);
 304                 return FALSE;
 305         }
 306
 307         /* Highest known Control command ID
 308          * is BNEP_FILTER_MULT_ADDR_RSP = 0x06 */
 309         if (req->type == BNEP_CONTROL &&
 310                                 req->ctrl > BNEP_FILTER_MULT_ADDR_RSP) {
 311                 uint8_t pkt[3];
 312
 313                 pkt[0] = BNEP_CONTROL;
 314                 pkt[1] = BNEP_CMD_NOT_UNDERSTOOD;
 315                 pkt[2] = req->ctrl;
 316
 317                 send(sk, pkt, sizeof(pkt), 0);
 318
 319                 return FALSE;
 320         }
 321
 322         if (req->type != BNEP_CONTROL || req->ctrl != BNEP_SETUP_CONN_REQ)
 323                 return FALSE;
 324
 325         rsp = bnep_setup_decode(req, &dst_role, &src_role);
 326         if (rsp)
 327                 goto reply;
 328
 329         rsp = bnep_setup_chk(dst_role, src_role);
 330         if (rsp)
 331                 goto reply;
 332
 333         rsp = BNEP_CONN_NOT_ALLOWED;
 334
 335         ns = find_server(na->servers, dst_role);
 336         if (!ns) {
 337                 error("Server unavailable: (0x%x)", dst_role);
 338                 goto reply;
 339         }
 340
 341         if (!ns->record_id) {
 342                 error("Service record not available");
 343                 goto reply;
 344         }
 345
 346         if (!ns->bridge) {
 347                 error("Bridge interface not configured");
 348                 goto reply;
 349         }
 350
 351         strncpy(na->setup->dev, BNEP_INTERFACE, 16);
 352         na->setup->dev[15] = '\0';
 353
 354         if (bnep_server_add(sk, dst_role, ns->bridge, na->setup->dev,
 355                                                         &na->setup->dst) < 0)
 356                 goto reply;
 357
 358         na->setup = NULL;
 359
 360         rsp = BNEP_SUCCESS;
 361
 362 reply:
 363         bnep_send_ctrl_rsp(sk, BNEP_CONTROL, BNEP_SETUP_CONN_RSP, rsp);
 364
 365         return FALSE;
 366 }
 367
 368 static void connect_event(GIOChannel *chan, GError *err, gpointer user_data)
 369 {
 370         struct network_adapter *na = user_data;
 371
 372         if (err) {
 373                 error("%s", err->message);
 374                 setup_destroy(na);
 375                 return;
 376         }
 377
 378         g_io_channel_set_close_on_unref(chan, TRUE);
 379
 380         na->setup->watch = g_io_add_watch_full(chan, G_PRIORITY_DEFAULT,
 381                                 G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL,
 382                                 bnep_setup, na, setup_destroy);
 383 }
 384
 385 static void auth_cb(DBusError *derr, void *user_data)
 386 {
 387         struct network_adapter *na = user_data;
 388         GError *err = NULL;
 389
 390         if (derr) {
 391                 error("Access denied: %s", derr->message);
 392                 goto reject;
 393         }
 394
 395         if (!bt_io_accept(na->setup->io, connect_event, na, NULL,
 396                                                         &err)) {
 397                 error("bt_io_accept: %s", err->message);
 398                 g_error_free(err);
 399                 goto reject;
 400         }
 401
 402         return;
 403
 404 reject:
 405         g_io_channel_shutdown(na->setup->io, TRUE, NULL);
 406         setup_destroy(na);
 407 }
 408
 409 static void confirm_event(GIOChannel *chan, gpointer user_data)
 410 {
 411         struct network_adapter *na = user_data;
 412         struct network_server *ns;
 413         bdaddr_t src, dst;
 414         char address[18];
 415         GError *err = NULL;
 416         guint ret;
 417
 418         bt_io_get(chan, &err,
 419                         BT_IO_OPT_SOURCE_BDADDR, &src,
 420                         BT_IO_OPT_DEST_BDADDR, &dst,
 421                         BT_IO_OPT_DEST, address,
 422                         BT_IO_OPT_INVALID);
 423         if (err) {
 424                 error("%s", err->message);
 425                 g_error_free(err);
 426                 goto drop;
 427         }
 428
 429         DBG("BNEP: incoming connect from %s", address);
 430
 431         if (na->setup) {
 432                 error("Refusing connect from %s: setup in progress", address);
 433                 goto drop;
 434         }
 435
 436         ns = find_server(na->servers, BNEP_SVC_NAP);
 437         if (!ns)
 438                 goto drop;
 439
 440         if (!ns->record_id)
 441                 goto drop;
 442
 443         if (!ns->bridge)
 444                 goto drop;
 445
 446         na->setup = g_new0(struct network_session, 1);
 447         bacpy(&na->setup->dst, &dst);
 448         na->setup->io = g_io_channel_ref(chan);
 449
 450         ret = btd_request_authorization(&src, &dst, BNEP_SVC_UUID,
 451                                         auth_cb, na);
 452         if (ret == 0) {
 453                 error("Refusing connect from %s", address);
 454                 setup_destroy(na);
 455                 goto drop;
 456         }
 457
 458         return;
 459
 460 drop:
 461         g_io_channel_shutdown(chan, TRUE, NULL);
 462 }
 463
 464 int server_init(gboolean secure)
 465 {
 466         security = secure;
 467
 468         return 0;
 469 }
 470
 471 static uint32_t register_server_record(struct network_server *ns)
 472 {
 473         sdp_record_t *record;
 474
 475         record = server_record_new(ns->name, ns->id);
 476         if (!record) {
 477                 error("Unable to allocate new service record");
 478                 return 0;
 479         }
 480
 481         if (adapter_service_add(ns->na->adapter, record) < 0) {
 482                 error("Failed to register service record");
 483                 sdp_record_free(record);
 484                 return 0;
 485         }
 486
 487         DBG("got record id 0x%x", record->handle);
 488
 489         return record->handle;
 490 }
 491
 492 static void server_remove_sessions(struct network_server *ns)
 493 {
 494         GSList *list;
 495
 496         for (list = ns->sessions; list; list = list->next) {
 497                 struct network_session *session = list->data;
 498
 499                 if (*session->dev == '\0')
 500                         continue;
 501
 502                 bnep_server_delete(ns->bridge, session->dev, &session->dst);
 503         }
 504
 505         g_slist_free_full(ns->sessions, session_free);
 506
 507         ns->sessions = NULL;
 508 }
 509
 510 static void server_disconnect(DBusConnection *conn, void *user_data)
 511 {
 512         struct network_server *ns = user_data;
 513
 514         server_remove_sessions(ns);
 515
 516         ns->watch_id = 0;
 517
 518         if (ns->record_id) {
 519                 adapter_service_remove(ns->na->adapter, ns->record_id);
 520                 ns->record_id = 0;
 521         }
 522
 523         g_free(ns->bridge);
 524         ns->bridge = NULL;
 525 }
 526
 527 static DBusMessage *register_server(DBusConnection *conn,
 528                                 DBusMessage *msg, void *data)
 529 {
 530         struct network_adapter *na = data;
 531         struct network_server *ns;
 532         DBusMessage *reply;
 533         const char *uuid, *bridge;
 534
 535         if (!dbus_message_get_args(msg, NULL, DBUS_TYPE_STRING, &uuid,
 536                                 DBUS_TYPE_STRING, &bridge, DBUS_TYPE_INVALID))
 537                 return btd_error_invalid_args(msg);
 538
 539         ns = find_server_by_uuid(na->servers, uuid);
 540         if (ns == NULL)
 541                 return btd_error_failed(msg, "Invalid UUID");
 542
 543         if (ns->record_id)
 544                 return btd_error_already_exists(msg);
 545
 546         reply = dbus_message_new_method_return(msg);
 547         if (!reply)
 548                 return NULL;
 549
 550         ns->record_id = register_server_record(ns);
 551         if (!ns->record_id)
 552                 return btd_error_failed(msg, "SDP record registration failed");
 553
 554         g_free(ns->bridge);
 555         ns->bridge = g_strdup(bridge);
 556
 557         ns->watch_id = g_dbus_add_disconnect_watch(conn,
 558                                         dbus_message_get_sender(msg),
 559                                         server_disconnect, ns, NULL);
 560
 561         return reply;
 562 }
 563
 564 static DBusMessage *unregister_server(DBusConnection *conn,
 565                                         DBusMessage *msg, void *data)
 566 {
 567         struct network_adapter *na = data;
 568         struct network_server *ns;
 569         DBusMessage *reply;
 570         const char *uuid;
 571
 572         if (!dbus_message_get_args(msg, NULL, DBUS_TYPE_STRING, &uuid,
 573                                                         DBUS_TYPE_INVALID))
 574                 return btd_error_invalid_args(msg);
 575
 576         ns = find_server_by_uuid(na->servers, uuid);
 577         if (!ns)
 578                 return btd_error_failed(msg, "Invalid UUID");
 579
 580         reply = dbus_message_new_method_return(msg);
 581         if (!reply)
 582                 return NULL;
 583
 584         g_dbus_remove_watch(conn, ns->watch_id);
 585
 586         server_disconnect(conn, ns);
 587
 588         return reply;
 589 }
 590
 591 static void adapter_free(struct network_adapter *na)
 592 {
 593         if (na->io != NULL) {
 594                 g_io_channel_shutdown(na->io, TRUE, NULL);
 595                 g_io_channel_unref(na->io);
 596         }
 597
 598         setup_destroy(na);
 599         btd_adapter_unref(na->adapter);
 600         g_free(na);
 601 }
 602
 603 static void server_free(void *data)
 604 {
 605         struct network_server *ns = data;
 606
 607         if (!ns)
 608                 return;
 609
 610         server_remove_sessions(ns);
 611
 612         if (ns->record_id)
 613                 adapter_service_remove(ns->na->adapter, ns->record_id);
 614
 615         g_dbus_remove_watch(btd_get_dbus_connection(), ns->watch_id);
 616         g_free(ns->name);
 617         g_free(ns->bridge);
 618
 619         g_free(ns);
 620 }
 621
 622 static void path_unregister(void *data)
 623 {
 624         struct network_adapter *na = data;
 625
 626         DBG("Unregistered interface %s on path %s",
 627                 NETWORK_SERVER_INTERFACE, adapter_get_path(na->adapter));
 628
 629         g_slist_free_full(na->servers, server_free);
 630
 631         adapters = g_slist_remove(adapters, na);
 632         adapter_free(na);
 633 }
 634
 635 static const GDBusMethodTable server_methods[] = {
 636         { GDBUS_METHOD("Register",
 637                         GDBUS_ARGS({ "uuid", "s" }, { "bridge", "s" }), NULL,
 638                         register_server) },
 639         { GDBUS_METHOD("Unregister",
 640                         GDBUS_ARGS({ "uuid", "s" }), NULL,
 641                         unregister_server) },
 642         { }
 643 };
 644
 645 static struct network_adapter *create_adapter(struct btd_adapter *adapter)
 646 {
 647         struct network_adapter *na;
 648         GError *err = NULL;
 649
 650         na = g_new0(struct network_adapter, 1);
 651         na->adapter = btd_adapter_ref(adapter);
 652
 653         na->io = bt_io_listen(NULL, confirm_event, na,
 654                                 NULL, &err,
 655                                 BT_IO_OPT_SOURCE_BDADDR,
 656                                 btd_adapter_get_address(adapter),
 657                                 BT_IO_OPT_PSM, BNEP_PSM,
 658                                 BT_IO_OPT_OMTU, BNEP_MTU,
 659                                 BT_IO_OPT_IMTU, BNEP_MTU,
 660                                 BT_IO_OPT_SEC_LEVEL,
 661                                 security ? BT_IO_SEC_MEDIUM : BT_IO_SEC_LOW,
 662                                 BT_IO_OPT_INVALID);
 663         if (!na->io) {
 664                 error("%s", err->message);
 665                 g_error_free(err);
 666                 adapter_free(na);
 667                 return NULL;
 668         }
 669
 670         return na;
 671 }
 672
 673 int server_register(struct btd_adapter *adapter, uint16_t id)
 674 {
 675         struct network_adapter *na;
 676         struct network_server *ns;
 677         const char *path;
 678
 679         na = find_adapter(adapters, adapter);
 680         if (!na) {
 681                 na = create_adapter(adapter);
 682                 if (!na)
 683                         return -EINVAL;
 684                 adapters = g_slist_append(adapters, na);
 685         }
 686
 687         ns = find_server(na->servers, id);
 688         if (ns)
 689                 return 0;
 690
 691         ns = g_new0(struct network_server, 1);
 692
 693         ns->name = g_strdup("Network service");
 694
 695         path = adapter_get_path(adapter);
 696
 697         if (g_slist_length(na->servers) > 0)
 698                 goto done;
 699
 700         if (!g_dbus_register_interface(btd_get_dbus_connection(),
 701                                         path, NETWORK_SERVER_INTERFACE,
 702                                         server_methods, NULL, NULL,
 703                                         na, path_unregister)) {
 704                 error("D-Bus failed to register %s interface",
 705                                                 NETWORK_SERVER_INTERFACE);
 706                 server_free(ns);
 707                 return -1;
 708         }
 709
 710         DBG("Registered interface %s on path %s", NETWORK_SERVER_INTERFACE,
 711                                                                         path);
 712
 713 done:
 714         bacpy(&ns->src, btd_adapter_get_address(adapter));
 715         ns->id = id;
 716         ns->na = na;
 717         ns->record_id = 0;
 718         na->servers = g_slist_append(na->servers, ns);
 719
 720         return 0;
 721 }
 722
 723 int server_unregister(struct btd_adapter *adapter, uint16_t id)
 724 {
 725         struct network_adapter *na;
 726         struct network_server *ns;
 727
 728         na = find_adapter(adapters, adapter);
 729         if (!na)
 730                 return -EINVAL;
 731
 732         ns = find_server(na->servers, id);
 733         if (!ns)
 734                 return -EINVAL;
 735
 736         na->servers = g_slist_remove(na->servers, ns);
 737         server_free(ns);
 738
 739         if (g_slist_length(na->servers) > 0)
 740                 return 0;
 741
 742         g_dbus_unregister_interface(btd_get_dbus_connection(),
 743                                                 adapter_get_path(adapter),
 744                                                 NETWORK_SERVER_INTERFACE);
 745
 746         return 0;
 747 }