1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define __BTSTACK_FILE__ "panu_demo.c" 39 40 /* 41 * panu_demo.c 42 * Author: Ole Reinhardt <[email protected]> 43 */ 44 45 /* EXAMPLE_START(panu_demo): PANU Demo 46 * 47 * @text This example implements both a PANU client and a server. In server mode, it 48 * sets up a BNEP server and registers a PANU SDP record and waits for incoming connections. 49 * In client mode, it connects to a remote device, does an SDP Query to identify the PANU 50 * service and initiates a BNEP connection. 51 */ 52 53 #include "btstack_config.h" 54 55 #include <arpa/inet.h> 56 #include <errno.h> 57 #include <fcntl.h> 58 #include <ifaddrs.h> 59 #include <stdint.h> 60 #include <stdio.h> 61 #include <stdlib.h> 62 #include <string.h> 63 #include <unistd.h> 64 65 #include <net/if_arp.h> 66 67 #ifdef __APPLE__ 68 #include <net/if.h> 69 #include <net/if_types.h> 70 71 #include <netinet/if_ether.h> 72 #include <netinet/in.h> 73 #endif 74 75 #include <sys/ioctl.h> 76 #include <sys/param.h> 77 #include <sys/socket.h> 78 #include <sys/stat.h> 79 #include <sys/types.h> 80 81 #ifdef __linux 82 #include <linux/if.h> 83 #include <linux/if_tun.h> 84 #endif 85 86 #include "btstack.h" 87 88 static int record_id = -1; 89 static uint16_t bnep_l2cap_psm = 0; 90 static uint32_t bnep_remote_uuid = 0; 91 static uint16_t bnep_version = 0; 92 static uint16_t bnep_cid = 0; 93 94 static uint8_t attribute_value[1000]; 95 static const unsigned int attribute_value_buffer_size = sizeof(attribute_value); 96 97 static const char * remote_addr_string = "F4-0F-24-3B-1B-E1"; 98 static bd_addr_t remote_addr; 99 100 static int tap_fd = -1; 101 static uint8_t network_buffer[BNEP_MTU_MIN]; 102 static size_t network_buffer_len = 0; 103 104 #ifdef __APPLE__ 105 // tuntaposx provides fixed set of tapX devices 106 static const char * tap_dev = "/dev/tap0"; 107 static char tap_dev_name[16] = "tap0"; 108 #endif 109 110 #ifdef __linux 111 // Linux uses single control device to bring up tunX or tapX interface 112 static const char * tap_dev = "/dev/net/tun"; 113 static char tap_dev_name[16] = "bnep%d"; 114 #endif 115 116 117 static btstack_data_source_t tap_dev_ds; 118 static btstack_packet_callback_registration_t hci_event_callback_registration; 119 120 /* @section Main application configuration 121 * 122 * @text In the application configuration, L2CAP and BNEP are initialized and a BNEP service, for server mode, 123 * is registered, before the Bluetooth stack gets started, as shown in Listing PanuSetup. 124 */ 125 126 /* LISTING_START(PanuSetup): Panu setup */ 127 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 128 static void handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 129 130 static void panu_setup(void){ 131 132 // register for HCI events 133 hci_event_callback_registration.callback = &packet_handler; 134 hci_add_event_handler(&hci_event_callback_registration); 135 136 // Initialize L2CAP 137 l2cap_init(); 138 139 // Initialise BNEP 140 bnep_init(); 141 // Minimum L2CAP MTU for bnep is 1691 bytes 142 bnep_register_service(packet_handler, BLUETOOTH_SERVICE_CLASS_PANU, 1691); 143 } 144 /* LISTING_END */ 145 146 /* @section TUN / TAP interface routines 147 * 148 * @text This example requires a TUN/TAP interface to connect the Bluetooth network interface 149 * with the native system. It has been tested on Linux and OS X, but should work on any 150 * system that provides TUN/TAP with minor modifications. 151 * 152 * On Linux, TUN/TAP is available by default. On OS X, tuntaposx from 153 * http://tuntaposx.sourceforge.net needs to be installed. 154 * 155 * The *tap_alloc* function sets up a virtual network interface with the given Bluetooth Address. 156 * It is rather low-level as it sets up and configures a network interface. 157 */ 158 159 static int tap_alloc(char *dev, bd_addr_t bd_addr) 160 { 161 struct ifreq ifr; 162 int fd_dev; 163 int fd_socket; 164 165 if( (fd_dev = open(tap_dev, O_RDWR)) < 0 ) { 166 fprintf(stderr, "TAP: Error opening %s: %s\n", tap_dev, strerror(errno)); 167 return -1; 168 } 169 170 #ifdef __linux 171 memset(&ifr, 0, sizeof(ifr)); 172 173 ifr.ifr_flags = IFF_TAP | IFF_NO_PI; 174 if( *dev ) { 175 strncpy(ifr.ifr_name, dev, IFNAMSIZ); 176 } 177 178 int err; 179 if( (err = ioctl(fd_dev, TUNSETIFF, (void *) &ifr)) < 0 ) { 180 fprintf(stderr, "TAP: Error setting device name: %s\n", strerror(errno)); 181 close(fd_dev); 182 return -1; 183 } 184 strcpy(dev, ifr.ifr_name); 185 #endif 186 #ifdef __APPLE__ 187 dev = tap_dev_name; 188 #endif 189 190 fd_socket = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP); 191 if (fd_socket < 0) { 192 close(fd_dev); 193 fprintf(stderr, "TAP: Error opening netlink socket: %s\n", strerror(errno)); 194 return -1; 195 } 196 197 // Configure the MAC address of the newly created bnep(x) 198 // device to the local bd_address 199 memset (&ifr, 0, sizeof(struct ifreq)); 200 strcpy(ifr.ifr_name, dev); 201 #ifdef __linux 202 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER; 203 memcpy(ifr.ifr_hwaddr.sa_data, bd_addr, sizeof(bd_addr_t)); 204 if (ioctl(fd_socket, SIOCSIFHWADDR, &ifr) == -1) { 205 close(fd_dev); 206 close(fd_socket); 207 fprintf(stderr, "TAP: Error setting hw addr: %s\n", strerror(errno)); 208 exit(1); 209 return -1; 210 } 211 #endif 212 #ifdef __APPLE__ 213 ifr.ifr_addr.sa_len = ETHER_ADDR_LEN; 214 ifr.ifr_addr.sa_family = AF_LINK; 215 (void)memcpy(ifr.ifr_addr.sa_data, bd_addr, ETHER_ADDR_LEN); 216 if (ioctl(fd_socket, SIOCSIFLLADDR, &ifr) == -1) { 217 close(fd_dev); 218 close(fd_socket); 219 fprintf(stderr, "TAP: Error setting hw addr: %s\n", strerror(errno)); 220 exit(1); 221 return -1; 222 } 223 #endif 224 225 // Bring the interface up 226 if (ioctl(fd_socket, SIOCGIFFLAGS, &ifr) == -1) { 227 close(fd_dev); 228 close(fd_socket); 229 fprintf(stderr, "TAP: Error reading interface flags: %s\n", strerror(errno)); 230 return -1; 231 } 232 233 if ((ifr.ifr_flags & IFF_UP) == 0) { 234 ifr.ifr_flags |= IFF_UP; 235 236 if (ioctl(fd_socket, SIOCSIFFLAGS, &ifr) == -1) { 237 close(fd_dev); 238 close(fd_socket); 239 fprintf(stderr, "TAP: Error set IFF_UP: %s\n", strerror(errno)); 240 return -1; 241 } 242 } 243 244 close(fd_socket); 245 246 return fd_dev; 247 } 248 249 /* 250 * @text Listing processTapData shows how a packet is received from the TAP network interface 251 * and forwarded over the BNEP connection. 252 * 253 * After successfully reading a network packet, the call to 254 * the *bnep_can_send_packet_now* function checks, if BTstack can forward 255 * a network packet now. If that's not possible, the received data stays 256 * in the network buffer and the data source elements is removed from the 257 * run loop. The *process_tap_dev_data* function will not be called until 258 * the data source is registered again. This provides a basic flow control. 259 */ 260 261 /* LISTING_START(processTapData): Process incoming network packets */ 262 static void process_tap_dev_data(btstack_data_source_t *ds, btstack_data_source_callback_type_t callback_type) 263 { 264 UNUSED(ds); 265 UNUSED(callback_type); 266 267 ssize_t len; 268 len = read(ds->fd, network_buffer, sizeof(network_buffer)); 269 if (len <= 0){ 270 fprintf(stderr, "TAP: Error while reading: %s\n", strerror(errno)); 271 return; 272 } 273 274 network_buffer_len = len; 275 if (bnep_can_send_packet_now(bnep_cid)) { 276 bnep_send(bnep_cid, network_buffer, network_buffer_len); 277 network_buffer_len = 0; 278 } else { 279 // park the current network packet 280 btstack_run_loop_remove_data_source(&tap_dev_ds); 281 } 282 return; 283 } 284 /* LISTING_END */ 285 286 // PANU client routines 287 static char * get_string_from_data_element(uint8_t * element){ 288 de_size_t de_size = de_get_size_type(element); 289 int pos = de_get_header_size(element); 290 int len = 0; 291 switch (de_size){ 292 case DE_SIZE_VAR_8: 293 len = element[1]; 294 break; 295 case DE_SIZE_VAR_16: 296 len = big_endian_read_16(element, 1); 297 break; 298 default: 299 break; 300 } 301 char * str = (char*)malloc(len+1); 302 memcpy(str, &element[pos], len); 303 str[len] ='\0'; 304 return str; 305 } 306 307 308 /* @section SDP parser callback 309 * 310 * @text The SDP parsers retrieves the BNEP PAN UUID as explained in 311 * Section [on SDP BNEP Query example](#sec:sdpbnepqueryExample}. 312 */ 313 static void handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) { 314 315 UNUSED(packet_type); 316 UNUSED(channel); 317 UNUSED(size); 318 319 des_iterator_t des_list_it; 320 des_iterator_t prot_it; 321 char *str; 322 323 switch (hci_event_packet_get_type(packet)){ 324 case SDP_EVENT_QUERY_ATTRIBUTE_VALUE: 325 // Handle new SDP record 326 if (sdp_event_query_attribute_byte_get_record_id(packet) != record_id) { 327 record_id = sdp_event_query_attribute_byte_get_record_id(packet); 328 printf("SDP Record: Nr: %d\n", record_id); 329 } 330 331 if (sdp_event_query_attribute_byte_get_attribute_length(packet) <= attribute_value_buffer_size) { 332 attribute_value[sdp_event_query_attribute_byte_get_data_offset(packet)] = sdp_event_query_attribute_byte_get_data(packet); 333 334 if ((uint16_t)(sdp_event_query_attribute_byte_get_data_offset(packet)+1) == sdp_event_query_attribute_byte_get_attribute_length(packet)) { 335 336 switch(sdp_event_query_attribute_byte_get_attribute_id(packet)) { 337 case BLUETOOTH_ATTRIBUTE_SERVICE_CLASS_ID_LIST: 338 if (de_get_element_type(attribute_value) != DE_DES) break; 339 for (des_iterator_init(&des_list_it, attribute_value); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)) { 340 uint8_t * element = des_iterator_get_element(&des_list_it); 341 if (de_get_element_type(element) != DE_UUID) continue; 342 uint32_t uuid = de_get_uuid32(element); 343 switch (uuid){ 344 case BLUETOOTH_SERVICE_CLASS_PANU: 345 case BLUETOOTH_SERVICE_CLASS_NAP: 346 case BLUETOOTH_SERVICE_CLASS_GN: 347 printf("SDP Attribute 0x%04x: BNEP PAN protocol UUID: %04x\n", sdp_event_query_attribute_byte_get_attribute_id(packet), uuid); 348 bnep_remote_uuid = uuid; 349 break; 350 default: 351 break; 352 } 353 } 354 break; 355 case 0x0100: 356 case 0x0101: 357 str = get_string_from_data_element(attribute_value); 358 printf("SDP Attribute: 0x%04x: %s\n", sdp_event_query_attribute_byte_get_attribute_id(packet), str); 359 free(str); 360 break; 361 case BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST: { 362 printf("SDP Attribute: 0x%04x\n", sdp_event_query_attribute_byte_get_attribute_id(packet)); 363 364 for (des_iterator_init(&des_list_it, attribute_value); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)) { 365 uint8_t *des_element; 366 uint8_t *element; 367 uint32_t uuid; 368 369 if (des_iterator_get_type(&des_list_it) != DE_DES) continue; 370 371 des_element = des_iterator_get_element(&des_list_it); 372 des_iterator_init(&prot_it, des_element); 373 element = des_iterator_get_element(&prot_it); 374 375 if (de_get_element_type(element) != DE_UUID) continue; 376 377 uuid = de_get_uuid32(element); 378 switch (uuid){ 379 case BLUETOOTH_PROTOCOL_L2CAP: 380 if (!des_iterator_has_more(&prot_it)) continue; 381 des_iterator_next(&prot_it); 382 de_element_get_uint16(des_iterator_get_element(&prot_it), &bnep_l2cap_psm); 383 break; 384 case BLUETOOTH_PROTOCOL_BNEP: 385 if (!des_iterator_has_more(&prot_it)) continue; 386 des_iterator_next(&prot_it); 387 de_element_get_uint16(des_iterator_get_element(&prot_it), &bnep_version); 388 break; 389 default: 390 break; 391 } 392 } 393 printf("l2cap_psm 0x%04x, bnep_version 0x%04x\n", bnep_l2cap_psm, bnep_version); 394 395 } 396 break; 397 default: 398 break; 399 } 400 } 401 } else { 402 fprintf(stderr, "SDP attribute value buffer size exceeded: available %d, required %d\n", attribute_value_buffer_size, sdp_event_query_attribute_byte_get_attribute_length(packet)); 403 } 404 break; 405 406 case SDP_EVENT_QUERY_COMPLETE: 407 fprintf(stderr, "General query done with status %d, bnep psm %04x.\n", sdp_event_query_complete_get_status(packet), bnep_l2cap_psm); 408 if (bnep_l2cap_psm){ 409 /* Create BNEP connection */ 410 bnep_connect(packet_handler, remote_addr, bnep_l2cap_psm, BLUETOOTH_SERVICE_CLASS_PANU, bnep_remote_uuid); 411 } else { 412 fprintf(stderr, "No BNEP service found\n"); 413 } 414 415 break; 416 } 417 } 418 419 /* 420 * @section Packet Handler 421 * 422 * @text The packet handler responds to various HCI Events. 423 */ 424 425 426 /* LISTING_START(packetHandler): Packet Handler */ 427 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) 428 { 429 /* LISTING_PAUSE */ 430 UNUSED(channel); 431 432 int rc; 433 uint8_t event; 434 bd_addr_t event_addr; 435 bd_addr_t local_addr; 436 uint16_t uuid_source; 437 uint16_t uuid_dest; 438 uint16_t mtu; 439 440 /* LISTING_RESUME */ 441 switch (packet_type) { 442 case HCI_EVENT_PACKET: 443 event = hci_event_packet_get_type(packet); 444 switch (event) { 445 /* @text When BTSTACK_EVENT_STATE with state HCI_STATE_WORKING 446 * is received and the example is started in client mode, the remote SDP BNEP query is started. 447 */ 448 case BTSTACK_EVENT_STATE: 449 if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING){ 450 printf("Start SDP BNEP query.\n"); 451 sdp_client_query_uuid16(&handle_sdp_client_query_result, remote_addr, BLUETOOTH_PROTOCOL_BNEP); 452 } 453 break; 454 455 /* LISTING_PAUSE */ 456 case HCI_EVENT_PIN_CODE_REQUEST: 457 // inform about pin code request 458 printf("Pin code request - using '0000'\n"); 459 hci_event_pin_code_request_get_bd_addr(packet, event_addr); 460 gap_pin_code_response(event_addr, "0000"); 461 break; 462 463 case HCI_EVENT_USER_CONFIRMATION_REQUEST: 464 // inform about user confirmation request 465 printf("SSP User Confirmation Request with numeric value '%06u'\n", little_endian_read_32(packet, 8)); 466 printf("SSP User Confirmation Auto accept\n"); 467 break; 468 469 /* LISTING_RESUME */ 470 471 /* @text BNEP_EVENT_CHANNEL_OPENED is received after a BNEP connection was established or 472 * or when the connection fails. The status field returns the error code. 473 * 474 * The TAP network interface is then configured. A data source is set up and registered with the 475 * run loop to receive Ethernet packets from the TAP interface. 476 * 477 * The event contains both the source and destination UUIDs, as well as the MTU for this connection and 478 * the BNEP Channel ID, which is used for sending Ethernet packets over BNEP. 479 */ 480 case BNEP_EVENT_CHANNEL_OPENED: 481 if (bnep_event_channel_opened_get_status(packet)) { 482 printf("BNEP channel open failed, status %02x\n", bnep_event_channel_opened_get_status(packet)); 483 } else { 484 bnep_cid = bnep_event_channel_opened_get_bnep_cid(packet); 485 uuid_source = bnep_event_channel_opened_get_source_uuid(packet); 486 uuid_dest = bnep_event_channel_opened_get_destination_uuid(packet); 487 mtu = bnep_event_channel_opened_get_mtu(packet); 488 //bt_flip_addr(event_addr, &packet[9]); 489 memcpy(&event_addr, &packet[11], sizeof(bd_addr_t)); 490 printf("BNEP connection open succeeded to %s source UUID 0x%04x dest UUID: 0x%04x, max frame size %u\n", bd_addr_to_str(event_addr), uuid_source, uuid_dest, mtu); 491 /* Create the tap interface */ 492 gap_local_bd_addr(local_addr); 493 tap_fd = tap_alloc(tap_dev_name, local_addr); 494 if (tap_fd < 0) { 495 printf("Creating BNEP tap device failed: %s\n", strerror(errno)); 496 } else { 497 printf("BNEP device \"%s\" allocated.\n", tap_dev_name); 498 /* Create and register a new runloop data source */ 499 btstack_run_loop_set_data_source_fd(&tap_dev_ds, tap_fd); 500 btstack_run_loop_set_data_source_handler(&tap_dev_ds, &process_tap_dev_data); 501 btstack_run_loop_add_data_source(&tap_dev_ds); 502 } 503 } 504 break; 505 506 /* @text If there is a timeout during the connection setup, BNEP_EVENT_CHANNEL_TIMEOUT will be received 507 * and the BNEP connection will be closed 508 */ 509 case BNEP_EVENT_CHANNEL_TIMEOUT: 510 printf("BNEP channel timeout! Channel will be closed\n"); 511 break; 512 513 /* @text BNEP_EVENT_CHANNEL_CLOSED is received when the connection gets closed. 514 */ 515 case BNEP_EVENT_CHANNEL_CLOSED: 516 printf("BNEP channel closed\n"); 517 btstack_run_loop_remove_data_source(&tap_dev_ds); 518 if (tap_fd > 0) { 519 close(tap_fd); 520 tap_fd = -1; 521 } 522 break; 523 524 /* @text BNEP_EVENT_CAN_SEND_NOW indicates that a new packet can be send. This triggers the retry of a 525 * parked network packet. If this succeeds, the data source element is added to the run loop again. 526 */ 527 case BNEP_EVENT_CAN_SEND_NOW: 528 // Check for parked network packets and send it out now 529 if (network_buffer_len > 0) { 530 bnep_send(bnep_cid, network_buffer, network_buffer_len); 531 network_buffer_len = 0; 532 // Re-add the tap device data source 533 btstack_run_loop_add_data_source(&tap_dev_ds); 534 } 535 536 break; 537 538 default: 539 break; 540 } 541 break; 542 543 /* @text Ethernet packets from the remote device are received in the packet handler with type BNEP_DATA_PACKET. 544 * It is forwarded to the TAP interface. 545 */ 546 case BNEP_DATA_PACKET: 547 // Write out the ethernet frame to the tap device 548 if (tap_fd > 0) { 549 rc = write(tap_fd, packet, size); 550 if (rc < 0) { 551 fprintf(stderr, "TAP: Could not write to TAP device: %s\n", strerror(errno)); 552 } else 553 if (rc != size) { 554 fprintf(stderr, "TAP: Package written only partially %d of %d bytes\n", rc, size); 555 } 556 } 557 break; 558 559 default: 560 break; 561 } 562 } 563 /* LISTING_END */ 564 565 566 int btstack_main(int argc, const char * argv[]); 567 int btstack_main(int argc, const char * argv[]){ 568 569 (void)argc; 570 (void)argv; 571 572 printf("Client HCI init done\n"); 573 574 panu_setup(); 575 576 // parse human readable Bluetooth address 577 sscanf_bd_addr(remote_addr_string, remote_addr); 578 579 // Turn on the device 580 hci_power_control(HCI_POWER_ON); 581 return 0; 582 } 583 584 /* EXAMPLE_END */ 585 /* -*- Mode: C; indent-tabs-mode: nil; c-basic-offset: 4; tab-width: 4 -*- */ 586 587