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, 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 bnep_register_packet_handler(packet_handler); 150 // Minimum L2CAP MTU for bnep is 1691 bytes 151 bnep_register_service(SDP_PANU, 1691); 152 } 153 /* LISTING_END */ 154 155 /* @section TUN / TAP interface routines 156 * 157 * @text This example requires a TUN/TAP interface to connect the Bluetooth network interface 158 * with the native system. It has been tested on Linux and OS X, but should work on any 159 * system that provides TUN/TAP with minor modifications. 160 * 161 * On Linux, TUN/TAP is available by default. On OS X, tuntaposx from 162 * http://tuntaposx.sourceforge.net needs to be installed. 163 * 164 * The *tap_alloc* function sets up a virtual network interface with the given Bluetooth Address. 165 * It is rather low-level as it sets up and configures a network interface. 166 */ 167 168 static int tap_alloc(char *dev, bd_addr_t bd_addr) 169 { 170 struct ifreq ifr; 171 int fd_dev; 172 int fd_socket; 173 174 if( (fd_dev = open(tap_dev, O_RDWR)) < 0 ) { 175 fprintf(stderr, "TAP: Error opening %s: %s\n", tap_dev, strerror(errno)); 176 return -1; 177 } 178 179 #ifdef __linux 180 memset(&ifr, 0, sizeof(ifr)); 181 182 ifr.ifr_flags = IFF_TAP | IFF_NO_PI; 183 if( *dev ) { 184 strncpy(ifr.ifr_name, dev, IFNAMSIZ); 185 } 186 187 int err; 188 if( (err = ioctl(fd_dev, TUNSETIFF, (void *) &ifr)) < 0 ) { 189 fprintf(stderr, "TAP: Error setting device name: %s\n", strerror(errno)); 190 close(fd_dev); 191 return -1; 192 } 193 strcpy(dev, ifr.ifr_name); 194 #endif 195 #ifdef __APPLE__ 196 dev = tap_dev_name; 197 #endif 198 199 fd_socket = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP); 200 if (fd_socket < 0) { 201 close(fd_dev); 202 fprintf(stderr, "TAP: Error opening netlink socket: %s\n", strerror(errno)); 203 return -1; 204 } 205 206 // Configure the MAC address of the newly created bnep(x) 207 // device to the local bd_address 208 memset (&ifr, 0, sizeof(struct ifreq)); 209 strcpy(ifr.ifr_name, dev); 210 #ifdef __linux 211 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER; 212 memcpy(ifr.ifr_hwaddr.sa_data, bd_addr, sizeof(bd_addr_t)); 213 if (ioctl(fd_socket, SIOCSIFHWADDR, &ifr) == -1) { 214 close(fd_dev); 215 close(fd_socket); 216 fprintf(stderr, "TAP: Error setting hw addr: %s\n", strerror(errno)); 217 exit(1); 218 return -1; 219 } 220 #endif 221 #ifdef __APPLE__ 222 ifr.ifr_addr.sa_len = ETHER_ADDR_LEN; 223 ifr.ifr_addr.sa_family = AF_LINK; 224 (void)memcpy(ifr.ifr_addr.sa_data, bd_addr, ETHER_ADDR_LEN); 225 if (ioctl(fd_socket, SIOCSIFLLADDR, &ifr) == -1) { 226 close(fd_dev); 227 close(fd_socket); 228 fprintf(stderr, "TAP: Error setting hw addr: %s\n", strerror(errno)); 229 exit(1); 230 return -1; 231 } 232 #endif 233 234 // Bring the interface up 235 if (ioctl(fd_socket, SIOCGIFFLAGS, &ifr) == -1) { 236 close(fd_dev); 237 close(fd_socket); 238 fprintf(stderr, "TAP: Error reading interface flags: %s\n", strerror(errno)); 239 return -1; 240 } 241 242 if ((ifr.ifr_flags & IFF_UP) == 0) { 243 ifr.ifr_flags |= IFF_UP; 244 245 if (ioctl(fd_socket, SIOCSIFFLAGS, &ifr) == -1) { 246 close(fd_dev); 247 close(fd_socket); 248 fprintf(stderr, "TAP: Error set IFF_UP: %s\n", strerror(errno)); 249 return -1; 250 } 251 } 252 253 close(fd_socket); 254 255 return fd_dev; 256 } 257 258 /* 259 * @text Listing processTapData shows how a packet is received from the TAP network interface 260 * and forwarded over the BNEP connection. 261 * 262 * After successfully reading a network packet, the call to 263 * the *bnep_can_send_packet_now* function checks, if BTstack can forward 264 * a network packet now. If that's not possible, the received data stays 265 * in the network buffer and the data source elements is removed from the 266 * run loop. The *process_tap_dev_data* function will not be called until 267 * the data source is registered again. This provides a basic flow control. 268 */ 269 270 /* LISTING_START(processTapData): Process incoming network packets */ 271 static int process_tap_dev_data(struct btstack_data_source *ds) 272 { 273 ssize_t len; 274 len = read(ds->fd, network_buffer, sizeof(network_buffer)); 275 if (len <= 0){ 276 fprintf(stderr, "TAP: Error while reading: %s\n", strerror(errno)); 277 return 0; 278 } 279 280 network_buffer_len = len; 281 if (bnep_can_send_packet_now(bnep_cid)) { 282 bnep_send(bnep_cid, network_buffer, network_buffer_len); 283 network_buffer_len = 0; 284 } else { 285 // park the current network packet 286 btstack_run_loop_remove_data_source(&tap_dev_ds); 287 } 288 return 0; 289 } 290 /* LISTING_END */ 291 292 // PANU client routines 293 static char * get_string_from_data_element(uint8_t * element){ 294 de_size_t de_size = de_get_size_type(element); 295 int pos = de_get_header_size(element); 296 int len = 0; 297 switch (de_size){ 298 case DE_SIZE_VAR_8: 299 len = element[1]; 300 break; 301 case DE_SIZE_VAR_16: 302 len = big_endian_read_16(element, 1); 303 break; 304 default: 305 break; 306 } 307 char * str = (char*)malloc(len+1); 308 memcpy(str, &element[pos], len); 309 str[len] ='\0'; 310 return str; 311 } 312 313 314 /* @section SDP parser callback 315 * 316 * @text The SDP parsers retrieves the BNEP PAN UUID as explained in 317 * Section [on SDP BNEP Query example](#sec:sdpbnepqueryExample}. 318 */ 319 static void handle_sdp_client_query_result(uint8_t packet_type, uint8_t *packet, uint16_t size) { 320 321 des_iterator_t des_list_it; 322 des_iterator_t prot_it; 323 char *str; 324 325 switch (hci_event_packet_get_type(packet)){ 326 case SDP_EVENT_QUERY_ATTRIBUTE_VALUE: 327 // Handle new SDP record 328 if (sdp_event_query_attribute_byte_get_record_id(packet) != record_id) { 329 record_id = sdp_event_query_attribute_byte_get_record_id(packet); 330 printf("SDP Record: Nr: %d\n", record_id); 331 } 332 333 if (sdp_event_query_attribute_byte_get_attribute_length(packet) <= attribute_value_buffer_size) { 334 attribute_value[sdp_event_query_attribute_byte_get_data_offset(packet)] = sdp_event_query_attribute_byte_get_data(packet); 335 336 if ((uint16_t)(sdp_event_query_attribute_byte_get_data_offset(packet)+1) == sdp_event_query_attribute_byte_get_attribute_length(packet)) { 337 338 switch(sdp_event_query_attribute_byte_get_attribute_id(packet)) { 339 case SDP_ServiceClassIDList: 340 if (de_get_element_type(attribute_value) != DE_DES) break; 341 for (des_iterator_init(&des_list_it, attribute_value); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)) { 342 uint8_t * element = des_iterator_get_element(&des_list_it); 343 if (de_get_element_type(element) != DE_UUID) continue; 344 uint32_t uuid = de_get_uuid32(element); 345 switch (uuid){ 346 case SDP_PANU: 347 case SDP_NAP: 348 case SDP_GN: 349 printf("SDP Attribute 0x%04x: BNEP PAN protocol UUID: %04x\n", sdp_event_query_attribute_byte_get_attribute_id(packet), uuid); 350 bnep_remote_uuid = uuid; 351 break; 352 default: 353 break; 354 } 355 } 356 break; 357 case 0x0100: 358 case 0x0101: 359 str = get_string_from_data_element(attribute_value); 360 printf("SDP Attribute: 0x%04x: %s\n", sdp_event_query_attribute_byte_get_attribute_id(packet), str); 361 free(str); 362 break; 363 case 0x0004: { 364 printf("SDP Attribute: 0x%04x\n", sdp_event_query_attribute_byte_get_attribute_id(packet)); 365 366 for (des_iterator_init(&des_list_it, attribute_value); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)) { 367 uint8_t *des_element; 368 uint8_t *element; 369 uint32_t uuid; 370 371 if (des_iterator_get_type(&des_list_it) != DE_DES) continue; 372 373 des_element = des_iterator_get_element(&des_list_it); 374 des_iterator_init(&prot_it, des_element); 375 element = des_iterator_get_element(&prot_it); 376 377 if (de_get_element_type(element) != DE_UUID) continue; 378 379 uuid = de_get_uuid32(element); 380 switch (uuid){ 381 case SDP_L2CAPProtocol: 382 if (!des_iterator_has_more(&prot_it)) continue; 383 des_iterator_next(&prot_it); 384 de_element_get_uint16(des_iterator_get_element(&prot_it), &bnep_l2cap_psm); 385 break; 386 case SDP_BNEPProtocol: 387 if (!des_iterator_has_more(&prot_it)) continue; 388 des_iterator_next(&prot_it); 389 de_element_get_uint16(des_iterator_get_element(&prot_it), &bnep_version); 390 break; 391 default: 392 break; 393 } 394 } 395 printf("l2cap_psm 0x%04x, bnep_version 0x%04x\n", bnep_l2cap_psm, bnep_version); 396 397 /* Create BNEP connection */ 398 bnep_connect(remote, bnep_l2cap_psm, PANU_UUID, bnep_remote_uuid); 399 } 400 break; 401 default: 402 break; 403 } 404 } 405 } else { 406 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)); 407 } 408 break; 409 410 case SDP_EVENT_QUERY_COMPLETE: 411 fprintf(stderr, "General query done with status %d.\n", sdp_event_query_complete_get_status(packet)); 412 413 break; 414 } 415 } 416 417 /* 418 * @section Packet Handler 419 * 420 * @text The packet handler responds to various HCI Events. 421 */ 422 423 424 /* LISTING_START(packetHandler): Packet Handler */ 425 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) 426 { 427 /* LISTING_PAUSE */ 428 int rc; 429 uint8_t event; 430 bd_addr_t event_addr; 431 bd_addr_t local_addr; 432 uint16_t uuid_source; 433 uint16_t uuid_dest; 434 uint16_t mtu; 435 436 /* LISTING_RESUME */ 437 switch (packet_type) { 438 case HCI_EVENT_PACKET: 439 event = hci_event_packet_get_type(packet); 440 switch (event) { 441 /* @text When BTSTACK_EVENT_STATE with state HCI_STATE_WORKING 442 * is received and the example is started in client mode, the remote SDP BNEP query is started. 443 */ 444 case BTSTACK_EVENT_STATE: 445 if (packet[2] == HCI_STATE_WORKING) { 446 printf("Start SDP BNEP query.\n"); 447 sdp_client_query_uuid16(remote, SDP_BNEPProtocol); 448 } 449 break; 450 451 /* LISTING_PAUSE */ 452 case HCI_EVENT_PIN_CODE_REQUEST: 453 // inform about pin code request 454 printf("Pin code request - using '0000'\n"); 455 reverse_bd_addr(&packet[2], event_addr); 456 hci_send_cmd(&hci_pin_code_request_reply, &event_addr, 4, "0000"); 457 break; 458 459 case HCI_EVENT_USER_CONFIRMATION_REQUEST: 460 // inform about user confirmation request 461 printf("SSP User Confirmation Request with numeric value '%06u'\n", little_endian_read_32(packet, 8)); 462 printf("SSP User Confirmation Auto accept\n"); 463 break; 464 465 /* LISTING_RESUME */ 466 467 /* @text BNEP_EVENT_OPEN_CHANNEL_COMPLETE is received after a BNEP connection was established or 468 * or when the connection fails. The status field returns the error code. 469 * 470 * The TAP network interface is then configured. A data source is set up and registered with the 471 * run loop to receive Ethernet packets from the TAP interface. 472 * 473 * The event contains both the source and destination UUIDs, as well as the MTU for this connection and 474 * the BNEP Channel ID, which is used for sending Ethernet packets over BNEP. 475 */ 476 case BNEP_EVENT_OPEN_CHANNEL_COMPLETE: 477 if (packet[2]) { 478 printf("BNEP channel open failed, status %02x\n", packet[2]); 479 } else { 480 // data: event(8), len(8), status (8), bnep source uuid (16), bnep destination uuid (16), remote_address (48) 481 uuid_source = little_endian_read_16(packet, 3); 482 uuid_dest = little_endian_read_16(packet, 5); 483 mtu = little_endian_read_16(packet, 7); 484 bnep_cid = channel; 485 //bt_flip_addr(event_addr, &packet[9]); 486 memcpy(&event_addr, &packet[9], sizeof(bd_addr_t)); 487 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); 488 /* Create the tap interface */ 489 gap_local_bd_addr(local_addr); 490 tap_fd = tap_alloc(tap_dev_name, local_addr); 491 if (tap_fd < 0) { 492 printf("Creating BNEP tap device failed: %s\n", strerror(errno)); 493 } else { 494 printf("BNEP device \"%s\" allocated.\n", tap_dev_name); 495 /* Create and register a new runloop data source */ 496 tap_dev_ds.fd = tap_fd; 497 tap_dev_ds.process = process_tap_dev_data; 498 btstack_run_loop_add_data_source(&tap_dev_ds); 499 } 500 } 501 break; 502 503 /* @text If there is a timeout during the connection setup, BNEP_EVENT_CHANNEL_TIMEOUT will be received 504 * and the BNEP connection will be closed 505 */ 506 case BNEP_EVENT_CHANNEL_TIMEOUT: 507 printf("BNEP channel timeout! Channel will be closed\n"); 508 break; 509 510 /* @text BNEP_EVENT_CHANNEL_CLOSED is received when the connection gets closed. 511 */ 512 case BNEP_EVENT_CHANNEL_CLOSED: 513 printf("BNEP channel closed\n"); 514 btstack_run_loop_remove_data_source(&tap_dev_ds); 515 if (tap_fd > 0) { 516 close(tap_fd); 517 tap_fd = -1; 518 } 519 break; 520 521 /* @text BNEP_EVENT_READY_TO_SEND indicates that a new packet can be send. This triggers the retry of a 522 * parked network packet. If this succeeds, the data source element is added to the run loop again. 523 */ 524 case BNEP_EVENT_READY_TO_SEND: 525 // Check for parked network packets and send it out now 526 if (network_buffer_len > 0) { 527 bnep_send(bnep_cid, network_buffer, network_buffer_len); 528 network_buffer_len = 0; 529 // Re-add the tap device data source 530 btstack_run_loop_add_data_source(&tap_dev_ds); 531 } 532 533 break; 534 535 default: 536 break; 537 } 538 break; 539 540 /* @text Ethernet packets from the remote device are received in the packet handler with type BNEP_DATA_PACKET. 541 * It is forwarded to the TAP interface. 542 */ 543 case BNEP_DATA_PACKET: 544 // Write out the ethernet frame to the tap device 545 if (tap_fd > 0) { 546 rc = write(tap_fd, packet, size); 547 if (rc < 0) { 548 fprintf(stderr, "TAP: Could not write to TAP device: %s\n", strerror(errno)); 549 } else 550 if (rc != size) { 551 fprintf(stderr, "TAP: Package written only partially %d of %d bytes\n", rc, size); 552 } 553 } 554 break; 555 556 default: 557 break; 558 } 559 } 560 /* LISTING_END */ 561 562 563 int btstack_main(int argc, const char * argv[]); 564 int btstack_main(int argc, const char * argv[]){ 565 566 printf("Client HCI init done\n"); 567 568 panu_setup(); 569 // Turn on the device 570 hci_power_control(HCI_POWER_ON); 571 return 0; 572 } 573 574 /* EXAMPLE_END */ 575 /* -*- Mode: C; indent-tabs-mode: nil; c-basic-offset: 4; tab-width: 4 -*- */ 576 577