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 /* 39 * panu_demo.c 40 * Author: Ole Reinhardt <[email protected]> 41 */ 42 43 /* EXAMPLE_START(panu_demo): PANU Demo 44 * 45 * @text This example implements both a PANU client and a server. In server mode, it 46 * sets up a BNEP server and registers a PANU SDP record and waits for incoming connections. 47 * In client mode, it connects to a remote device, does an SDP Query to identify the PANU 48 * service and initiates a BNEP connection. 49 */ 50 51 #include "btstack_config.h" 52 53 #include <arpa/inet.h> 54 #include <errno.h> 55 #include <fcntl.h> 56 #include <ifaddrs.h> 57 #include <stdint.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #include <unistd.h> 62 63 #include <net/if_arp.h> 64 65 #ifdef __APPLE__ 66 #include <net/if.h> 67 #include <net/if_types.h> 68 69 #include <netinet/if_ether.h> 70 #include <netinet/in.h> 71 #endif 72 73 #include <sys/ioctl.h> 74 #include <sys/param.h> 75 #include <sys/socket.h> 76 #include <sys/stat.h> 77 #include <sys/types.h> 78 79 #ifdef __linux 80 #include <linux/if.h> 81 #include <linux/if_tun.h> 82 #endif 83 84 #include "btstack_memory.h" 85 #include "btstack_event.h" 86 #include "btstack_run_loop.h" 87 #include "classic/sdp_client.h" 88 #include "classic/sdp_util.h" 89 #include "hci.h" 90 #include "hci_cmd.h" 91 #include "hci_dump.h" 92 #include "l2cap.h" 93 #include "pan.h" 94 95 static int record_id = -1; 96 static uint16_t bnep_l2cap_psm = 0; 97 static uint32_t bnep_remote_uuid = 0; 98 static uint16_t bnep_version = 0; 99 static uint16_t bnep_cid = 0; 100 101 static uint8_t attribute_value[1000]; 102 static const unsigned int attribute_value_buffer_size = sizeof(attribute_value); 103 104 //static bd_addr_t remote = {0x04,0x0C,0xCE,0xE4,0x85,0xD3}; 105 // static bd_addr_t remote = {0xE0,0x06,0xE6,0xBB,0x95,0x79}; // Ole Thinkpad 106 static bd_addr_t remote = {0x84,0x38,0x35,0x65,0xD1,0x15}; // MacBook 2013 107 108 static int tap_fd = -1; 109 static uint8_t network_buffer[BNEP_MTU_MIN]; 110 static size_t network_buffer_len = 0; 111 112 #ifdef __APPLE__ 113 // tuntaposx provides fixed set of tapX devices 114 static const char * tap_dev = "/dev/tap0"; 115 static char tap_dev_name[16] = "tap0"; 116 #endif 117 118 #ifdef __linux 119 // Linux uses single control device to bring up tunX or tapX interface 120 static const char * tap_dev = "/dev/net/tun"; 121 static char tap_dev_name[16] = "bnep%d"; 122 #endif 123 124 125 static btstack_data_source_t tap_dev_ds; 126 static btstack_packet_callback_registration_t hci_event_callback_registration; 127 128 /* @section Main application configuration 129 * 130 * @text In the application configuration, L2CAP and BNEP are initialized and a BNEP service, for server mode, 131 * is registered, before the Bluetooth stack gets started, as shown in Listing PanuSetup. 132 */ 133 134 /* LISTING_START(PanuSetup): Panu setup */ 135 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 136 static void handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 137 138 static void panu_setup(void){ 139 140 // register for HCI events 141 hci_event_callback_registration.callback = &packet_handler; 142 hci_add_event_handler(&hci_event_callback_registration); 143 144 // Initialize L2CAP 145 l2cap_init(); 146 147 // Initialise BNEP 148 bnep_init(); 149 // Minimum L2CAP MTU for bnep is 1691 bytes 150 bnep_register_service(packet_handler, SDP_PANU, 1691); 151 } 152 /* LISTING_END */ 153 154 /* @section TUN / TAP interface routines 155 * 156 * @text This example requires a TUN/TAP interface to connect the Bluetooth network interface 157 * with the native system. It has been tested on Linux and OS X, but should work on any 158 * system that provides TUN/TAP with minor modifications. 159 * 160 * On Linux, TUN/TAP is available by default. On OS X, tuntaposx from 161 * http://tuntaposx.sourceforge.net needs to be installed. 162 * 163 * The *tap_alloc* function sets up a virtual network interface with the given Bluetooth Address. 164 * It is rather low-level as it sets up and configures a network interface. 165 */ 166 167 static int tap_alloc(char *dev, bd_addr_t bd_addr) 168 { 169 struct ifreq ifr; 170 int fd_dev; 171 int fd_socket; 172 173 if( (fd_dev = open(tap_dev, O_RDWR)) < 0 ) { 174 fprintf(stderr, "TAP: Error opening %s: %s\n", tap_dev, strerror(errno)); 175 return -1; 176 } 177 178 #ifdef __linux 179 memset(&ifr, 0, sizeof(ifr)); 180 181 ifr.ifr_flags = IFF_TAP | IFF_NO_PI; 182 if( *dev ) { 183 strncpy(ifr.ifr_name, dev, IFNAMSIZ); 184 } 185 186 int err; 187 if( (err = ioctl(fd_dev, TUNSETIFF, (void *) &ifr)) < 0 ) { 188 fprintf(stderr, "TAP: Error setting device name: %s\n", strerror(errno)); 189 close(fd_dev); 190 return -1; 191 } 192 strcpy(dev, ifr.ifr_name); 193 #endif 194 #ifdef __APPLE__ 195 dev = tap_dev_name; 196 #endif 197 198 fd_socket = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP); 199 if (fd_socket < 0) { 200 close(fd_dev); 201 fprintf(stderr, "TAP: Error opening netlink socket: %s\n", strerror(errno)); 202 return -1; 203 } 204 205 // Configure the MAC address of the newly created bnep(x) 206 // device to the local bd_address 207 memset (&ifr, 0, sizeof(struct ifreq)); 208 strcpy(ifr.ifr_name, dev); 209 #ifdef __linux 210 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER; 211 memcpy(ifr.ifr_hwaddr.sa_data, bd_addr, sizeof(bd_addr_t)); 212 if (ioctl(fd_socket, SIOCSIFHWADDR, &ifr) == -1) { 213 close(fd_dev); 214 close(fd_socket); 215 fprintf(stderr, "TAP: Error setting hw addr: %s\n", strerror(errno)); 216 exit(1); 217 return -1; 218 } 219 #endif 220 #ifdef __APPLE__ 221 ifr.ifr_addr.sa_len = ETHER_ADDR_LEN; 222 ifr.ifr_addr.sa_family = AF_LINK; 223 (void)memcpy(ifr.ifr_addr.sa_data, bd_addr, ETHER_ADDR_LEN); 224 if (ioctl(fd_socket, SIOCSIFLLADDR, &ifr) == -1) { 225 close(fd_dev); 226 close(fd_socket); 227 fprintf(stderr, "TAP: Error setting hw addr: %s\n", strerror(errno)); 228 exit(1); 229 return -1; 230 } 231 #endif 232 233 // Bring the interface up 234 if (ioctl(fd_socket, SIOCGIFFLAGS, &ifr) == -1) { 235 close(fd_dev); 236 close(fd_socket); 237 fprintf(stderr, "TAP: Error reading interface flags: %s\n", strerror(errno)); 238 return -1; 239 } 240 241 if ((ifr.ifr_flags & IFF_UP) == 0) { 242 ifr.ifr_flags |= IFF_UP; 243 244 if (ioctl(fd_socket, SIOCSIFFLAGS, &ifr) == -1) { 245 close(fd_dev); 246 close(fd_socket); 247 fprintf(stderr, "TAP: Error set IFF_UP: %s\n", strerror(errno)); 248 return -1; 249 } 250 } 251 252 close(fd_socket); 253 254 return fd_dev; 255 } 256 257 /* 258 * @text Listing processTapData shows how a packet is received from the TAP network interface 259 * and forwarded over the BNEP connection. 260 * 261 * After successfully reading a network packet, the call to 262 * the *bnep_can_send_packet_now* function checks, if BTstack can forward 263 * a network packet now. If that's not possible, the received data stays 264 * in the network buffer and the data source elements is removed from the 265 * run loop. The *process_tap_dev_data* function will not be called until 266 * the data source is registered again. This provides a basic flow control. 267 */ 268 269 /* LISTING_START(processTapData): Process incoming network packets */ 270 static void process_tap_dev_data(btstack_data_source_t *ds, btstack_data_source_callback_type_t callback_type) 271 { 272 ssize_t len; 273 len = read(ds->fd, network_buffer, sizeof(network_buffer)); 274 if (len <= 0){ 275 fprintf(stderr, "TAP: Error while reading: %s\n", strerror(errno)); 276 return; 277 } 278 279 network_buffer_len = len; 280 if (bnep_can_send_packet_now(bnep_cid)) { 281 bnep_send(bnep_cid, network_buffer, network_buffer_len); 282 network_buffer_len = 0; 283 } else { 284 // park the current network packet 285 btstack_run_loop_remove_data_source(&tap_dev_ds); 286 } 287 return; 288 } 289 /* LISTING_END */ 290 291 // PANU client routines 292 static char * get_string_from_data_element(uint8_t * element){ 293 de_size_t de_size = de_get_size_type(element); 294 int pos = de_get_header_size(element); 295 int len = 0; 296 switch (de_size){ 297 case DE_SIZE_VAR_8: 298 len = element[1]; 299 break; 300 case DE_SIZE_VAR_16: 301 len = big_endian_read_16(element, 1); 302 break; 303 default: 304 break; 305 } 306 char * str = (char*)malloc(len+1); 307 memcpy(str, &element[pos], len); 308 str[len] ='\0'; 309 return str; 310 } 311 312 313 /* @section SDP parser callback 314 * 315 * @text The SDP parsers retrieves the BNEP PAN UUID as explained in 316 * Section [on SDP BNEP Query example](#sec:sdpbnepqueryExample}. 317 */ 318 static void handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) { 319 320 des_iterator_t des_list_it; 321 des_iterator_t prot_it; 322 char *str; 323 324 switch (hci_event_packet_get_type(packet)){ 325 case SDP_EVENT_QUERY_ATTRIBUTE_VALUE: 326 // Handle new SDP record 327 if (sdp_event_query_attribute_byte_get_record_id(packet) != record_id) { 328 record_id = sdp_event_query_attribute_byte_get_record_id(packet); 329 printf("SDP Record: Nr: %d\n", record_id); 330 } 331 332 if (sdp_event_query_attribute_byte_get_attribute_length(packet) <= attribute_value_buffer_size) { 333 attribute_value[sdp_event_query_attribute_byte_get_data_offset(packet)] = sdp_event_query_attribute_byte_get_data(packet); 334 335 if ((uint16_t)(sdp_event_query_attribute_byte_get_data_offset(packet)+1) == sdp_event_query_attribute_byte_get_attribute_length(packet)) { 336 337 switch(sdp_event_query_attribute_byte_get_attribute_id(packet)) { 338 case SDP_ServiceClassIDList: 339 if (de_get_element_type(attribute_value) != DE_DES) break; 340 for (des_iterator_init(&des_list_it, attribute_value); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)) { 341 uint8_t * element = des_iterator_get_element(&des_list_it); 342 if (de_get_element_type(element) != DE_UUID) continue; 343 uint32_t uuid = de_get_uuid32(element); 344 switch (uuid){ 345 case SDP_PANU: 346 case SDP_NAP: 347 case SDP_GN: 348 printf("SDP Attribute 0x%04x: BNEP PAN protocol UUID: %04x\n", sdp_event_query_attribute_byte_get_attribute_id(packet), uuid); 349 bnep_remote_uuid = uuid; 350 break; 351 default: 352 break; 353 } 354 } 355 break; 356 case 0x0100: 357 case 0x0101: 358 str = get_string_from_data_element(attribute_value); 359 printf("SDP Attribute: 0x%04x: %s\n", sdp_event_query_attribute_byte_get_attribute_id(packet), str); 360 free(str); 361 break; 362 case 0x0004: { 363 printf("SDP Attribute: 0x%04x\n", sdp_event_query_attribute_byte_get_attribute_id(packet)); 364 365 for (des_iterator_init(&des_list_it, attribute_value); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)) { 366 uint8_t *des_element; 367 uint8_t *element; 368 uint32_t uuid; 369 370 if (des_iterator_get_type(&des_list_it) != DE_DES) continue; 371 372 des_element = des_iterator_get_element(&des_list_it); 373 des_iterator_init(&prot_it, des_element); 374 element = des_iterator_get_element(&prot_it); 375 376 if (de_get_element_type(element) != DE_UUID) continue; 377 378 uuid = de_get_uuid32(element); 379 switch (uuid){ 380 case SDP_L2CAPProtocol: 381 if (!des_iterator_has_more(&prot_it)) continue; 382 des_iterator_next(&prot_it); 383 de_element_get_uint16(des_iterator_get_element(&prot_it), &bnep_l2cap_psm); 384 break; 385 case SDP_BNEPProtocol: 386 if (!des_iterator_has_more(&prot_it)) continue; 387 des_iterator_next(&prot_it); 388 de_element_get_uint16(des_iterator_get_element(&prot_it), &bnep_version); 389 break; 390 default: 391 break; 392 } 393 } 394 printf("l2cap_psm 0x%04x, bnep_version 0x%04x\n", bnep_l2cap_psm, bnep_version); 395 396 /* Create BNEP connection */ 397 bnep_connect(packet_handler, remote, bnep_l2cap_psm, PANU_UUID, bnep_remote_uuid); 398 } 399 break; 400 default: 401 break; 402 } 403 } 404 } else { 405 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)); 406 } 407 break; 408 409 case SDP_EVENT_QUERY_COMPLETE: 410 fprintf(stderr, "General query done with status %d.\n", sdp_event_query_complete_get_status(packet)); 411 412 break; 413 } 414 } 415 416 /* 417 * @section Packet Handler 418 * 419 * @text The packet handler responds to various HCI Events. 420 */ 421 422 423 /* LISTING_START(packetHandler): Packet Handler */ 424 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) 425 { 426 /* LISTING_PAUSE */ 427 int rc; 428 uint8_t event; 429 bd_addr_t event_addr; 430 bd_addr_t local_addr; 431 uint16_t uuid_source; 432 uint16_t uuid_dest; 433 uint16_t mtu; 434 435 /* LISTING_RESUME */ 436 switch (packet_type) { 437 case HCI_EVENT_PACKET: 438 event = hci_event_packet_get_type(packet); 439 switch (event) { 440 /* @text When BTSTACK_EVENT_STATE with state HCI_STATE_WORKING 441 * is received and the example is started in client mode, the remote SDP BNEP query is started. 442 */ 443 case BTSTACK_EVENT_STATE: 444 if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING){ 445 printf("Start SDP BNEP query.\n"); 446 sdp_client_query_uuid16(&handle_sdp_client_query_result, remote, SDP_BNEPProtocol); 447 } 448 break; 449 450 /* LISTING_PAUSE */ 451 case HCI_EVENT_PIN_CODE_REQUEST: 452 // inform about pin code request 453 printf("Pin code request - using '0000'\n"); 454 hci_event_pin_code_request_get_bd_addr(packet, event_addr); 455 hci_send_cmd(&hci_pin_code_request_reply, &event_addr, 4, "0000"); 456 break; 457 458 case HCI_EVENT_USER_CONFIRMATION_REQUEST: 459 // inform about user confirmation request 460 printf("SSP User Confirmation Request with numeric value '%06u'\n", little_endian_read_32(packet, 8)); 461 printf("SSP User Confirmation Auto accept\n"); 462 break; 463 464 /* LISTING_RESUME */ 465 466 /* @text BNEP_EVENT_CHANNEL_OPENED is received after a BNEP connection was established or 467 * or when the connection fails. The status field returns the error code. 468 * 469 * The TAP network interface is then configured. A data source is set up and registered with the 470 * run loop to receive Ethernet packets from the TAP interface. 471 * 472 * The event contains both the source and destination UUIDs, as well as the MTU for this connection and 473 * the BNEP Channel ID, which is used for sending Ethernet packets over BNEP. 474 */ 475 case BNEP_EVENT_CHANNEL_OPENED: 476 if (bnep_event_channel_opened_get_status(packet)) { 477 printf("BNEP channel open failed, status %02x\n", bnep_event_channel_opened_get_status(packet)); 478 } else { 479 bnep_cid = bnep_event_channel_opened_get_bnep_cid(packet); 480 uuid_source = bnep_event_channel_opened_get_source_uuid(packet); 481 uuid_dest = bnep_event_channel_opened_get_destination_uuid(packet); 482 mtu = bnep_event_channel_opened_get_mtu(packet); 483 //bt_flip_addr(event_addr, &packet[9]); 484 memcpy(&event_addr, &packet[11], sizeof(bd_addr_t)); 485 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); 486 /* Create the tap interface */ 487 gap_local_bd_addr(local_addr); 488 tap_fd = tap_alloc(tap_dev_name, local_addr); 489 if (tap_fd < 0) { 490 printf("Creating BNEP tap device failed: %s\n", strerror(errno)); 491 } else { 492 printf("BNEP device \"%s\" allocated.\n", tap_dev_name); 493 /* Create and register a new runloop data source */ 494 btstack_run_loop_set_data_source_fd(&tap_dev_ds, tap_fd); 495 btstack_run_loop_set_data_source_handler(&tap_dev_ds, &process_tap_dev_data); 496 btstack_run_loop_add_data_source(&tap_dev_ds); 497 } 498 } 499 break; 500 501 /* @text If there is a timeout during the connection setup, BNEP_EVENT_CHANNEL_TIMEOUT will be received 502 * and the BNEP connection will be closed 503 */ 504 case BNEP_EVENT_CHANNEL_TIMEOUT: 505 printf("BNEP channel timeout! Channel will be closed\n"); 506 break; 507 508 /* @text BNEP_EVENT_CHANNEL_CLOSED is received when the connection gets closed. 509 */ 510 case BNEP_EVENT_CHANNEL_CLOSED: 511 printf("BNEP channel closed\n"); 512 btstack_run_loop_remove_data_source(&tap_dev_ds); 513 if (tap_fd > 0) { 514 close(tap_fd); 515 tap_fd = -1; 516 } 517 break; 518 519 /* @text BNEP_EVENT_CAN_SEND_NOW indicates that a new packet can be send. This triggers the retry of a 520 * parked network packet. If this succeeds, the data source element is added to the run loop again. 521 */ 522 case BNEP_EVENT_CAN_SEND_NOW: 523 // Check for parked network packets and send it out now 524 if (network_buffer_len > 0) { 525 bnep_send(bnep_cid, network_buffer, network_buffer_len); 526 network_buffer_len = 0; 527 // Re-add the tap device data source 528 btstack_run_loop_add_data_source(&tap_dev_ds); 529 } 530 531 break; 532 533 default: 534 break; 535 } 536 break; 537 538 /* @text Ethernet packets from the remote device are received in the packet handler with type BNEP_DATA_PACKET. 539 * It is forwarded to the TAP interface. 540 */ 541 case BNEP_DATA_PACKET: 542 // Write out the ethernet frame to the tap device 543 if (tap_fd > 0) { 544 rc = write(tap_fd, packet, size); 545 if (rc < 0) { 546 fprintf(stderr, "TAP: Could not write to TAP device: %s\n", strerror(errno)); 547 } else 548 if (rc != size) { 549 fprintf(stderr, "TAP: Package written only partially %d of %d bytes\n", rc, size); 550 } 551 } 552 break; 553 554 default: 555 break; 556 } 557 } 558 /* LISTING_END */ 559 560 561 int btstack_main(int argc, const char * argv[]); 562 int btstack_main(int argc, const char * argv[]){ 563 564 printf("Client HCI init done\n"); 565 566 panu_setup(); 567 // Turn on the device 568 hci_power_control(HCI_POWER_ON); 569 return 0; 570 } 571 572 /* EXAMPLE_END */ 573 /* -*- Mode: C; indent-tabs-mode: nil; c-basic-offset: 4; tab-width: 4 -*- */ 574 575