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__ "sdp_client.c" 39 40 /* 41 * sdp_client.c 42 */ 43 #include "btstack_config.h" 44 45 #include "bluetooth_psm.h" 46 #include "bluetooth_sdp.h" 47 #include "btstack_debug.h" 48 #include "btstack_event.h" 49 #include "classic/core.h" 50 #include "classic/sdp_client.h" 51 #include "classic/sdp_server.h" 52 #include "classic/sdp_util.h" 53 #include "hci_cmd.h" 54 #include "l2cap.h" 55 56 // Types SDP Parser - Data Element stream helper 57 typedef enum { 58 GET_LIST_LENGTH = 1, 59 GET_RECORD_LENGTH, 60 GET_ATTRIBUTE_ID_HEADER_LENGTH, 61 GET_ATTRIBUTE_ID, 62 GET_ATTRIBUTE_VALUE_LENGTH, 63 GET_ATTRIBUTE_VALUE 64 } sdp_parser_state_t; 65 66 // Types SDP Client 67 typedef enum { 68 INIT, W4_CONNECT, W2_SEND, W4_RESPONSE, QUERY_COMPLETE 69 } sdp_client_state_t; 70 71 72 // Prototypes SDP Parser 73 void sdp_parser_init(btstack_packet_handler_t callback); 74 void sdp_parser_handle_chunk(uint8_t * data, uint16_t size); 75 void sdp_parser_handle_done(uint8_t status); 76 void sdp_parser_init_service_attribute_search(void); 77 void sdp_parser_init_service_search(void); 78 void sdp_parser_handle_service_search(uint8_t * data, uint16_t total_count, uint16_t record_handle_count); 79 80 // Prototypes SDP Client 81 void sdp_client_reset(void); 82 void sdp_client_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 83 static uint16_t sdp_client_setup_service_search_attribute_request(uint8_t * data); 84 #ifdef ENABLE_SDP_EXTRA_QUERIES 85 static uint16_t sdp_client_setup_service_search_request(uint8_t * data); 86 static uint16_t sdp_client_setup_service_attribute_request(uint8_t * data); 87 static void sdp_client_parse_service_search_response(uint8_t* packet, uint16_t size); 88 static void sdp_client_parse_service_attribute_response(uint8_t* packet, uint16_t size); 89 #endif 90 91 static uint8_t des_attributeIDList[] = { 0x35, 0x05, 0x0A, 0x00, 0x00, 0xff, 0xff}; // Attribute: 0x0000 - 0xffff 92 93 // State DES Parser 94 static de_state_t de_header_state; 95 96 // State SDP Parser 97 static sdp_parser_state_t state = GET_LIST_LENGTH; 98 static uint16_t attribute_id = 0; 99 static uint16_t attribute_bytes_received = 0; 100 static uint16_t attribute_bytes_delivered = 0; 101 static uint16_t list_offset = 0; 102 static uint16_t list_size; 103 static uint16_t record_offset = 0; 104 static uint16_t record_size; 105 static uint16_t attribute_value_size; 106 static int record_counter = 0; 107 static btstack_packet_handler_t sdp_parser_callback; 108 109 // State SDP Client 110 static uint16_t mtu; 111 static uint16_t sdp_cid = 0x40; 112 static const uint8_t * service_search_pattern; 113 static const uint8_t * attribute_id_list; 114 static uint16_t transactionID = 0; 115 static uint8_t continuationState[16]; 116 static uint8_t continuationStateLen; 117 static sdp_client_state_t sdp_client_state = INIT; 118 static SDP_PDU_ID_t PDU_ID = SDP_Invalid; 119 120 // Query registration 121 static btstack_linked_list_t sdp_client_query_requests; 122 123 #ifdef ENABLE_SDP_EXTRA_QUERIES 124 static uint32_t serviceRecordHandle; 125 static uint32_t record_handle; 126 #endif 127 128 // DES Parser 129 void de_state_init(de_state_t * de_state){ 130 de_state->in_state_GET_DE_HEADER_LENGTH = 1; 131 de_state->addon_header_bytes = 0; 132 de_state->de_size = 0; 133 de_state->de_offset = 0; 134 } 135 136 int de_state_size(uint8_t eventByte, de_state_t *de_state){ 137 if (de_state->in_state_GET_DE_HEADER_LENGTH){ 138 de_state->addon_header_bytes = de_get_header_size(&eventByte) - 1; 139 de_state->de_size = 0; 140 de_state->de_offset = 0; 141 142 if (de_state->addon_header_bytes == 0){ 143 de_state->de_size = de_get_data_size(&eventByte); 144 if (de_state->de_size == 0) { 145 log_error(" ERROR: ID size is zero"); 146 } 147 // log_info("Data element payload is %d bytes.", de_state->de_size); 148 return 1; 149 } 150 de_state->in_state_GET_DE_HEADER_LENGTH = 0; 151 return 0; 152 } 153 154 if (de_state->addon_header_bytes > 0){ 155 de_state->de_size = (de_state->de_size << 8) | eventByte; 156 de_state->addon_header_bytes--; 157 } 158 if (de_state->addon_header_bytes > 0) return 0; 159 // log_info("Data element payload is %d bytes.", de_state->de_size); 160 de_state->in_state_GET_DE_HEADER_LENGTH = 1; 161 return 1; 162 } 163 164 // SDP Parser 165 static void sdp_parser_emit_value_byte(uint8_t event_byte){ 166 uint8_t event[11]; 167 event[0] = SDP_EVENT_QUERY_ATTRIBUTE_VALUE; 168 event[1] = 9; 169 little_endian_store_16(event, 2, record_counter); 170 little_endian_store_16(event, 4, attribute_id); 171 little_endian_store_16(event, 6, attribute_value_size); 172 little_endian_store_16(event, 8, attribute_bytes_delivered); 173 event[10] = event_byte; 174 (*sdp_parser_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 175 } 176 177 static void sdp_parser_process_byte(uint8_t eventByte){ 178 // count all bytes 179 list_offset++; 180 record_offset++; 181 182 // log_info(" parse BYTE_RECEIVED %02x", eventByte); 183 switch(state){ 184 case GET_LIST_LENGTH: 185 if (!de_state_size(eventByte, &de_header_state)) break; 186 list_offset = de_header_state.de_offset; 187 list_size = de_header_state.de_size; 188 // log_info("parser: List offset %u, list size %u", list_offset, list_size); 189 190 record_counter = 0; 191 state = GET_RECORD_LENGTH; 192 break; 193 194 case GET_RECORD_LENGTH: 195 // check size 196 if (!de_state_size(eventByte, &de_header_state)) break; 197 // log_info("parser: Record payload is %d bytes.", de_header_state.de_size); 198 record_offset = de_header_state.de_offset; 199 record_size = de_header_state.de_size; 200 state = GET_ATTRIBUTE_ID_HEADER_LENGTH; 201 break; 202 203 case GET_ATTRIBUTE_ID_HEADER_LENGTH: 204 if (!de_state_size(eventByte, &de_header_state)) break; 205 attribute_id = 0; 206 log_debug("ID data is stored in %d bytes.", (int) de_header_state.de_size); 207 state = GET_ATTRIBUTE_ID; 208 break; 209 210 case GET_ATTRIBUTE_ID: 211 attribute_id = (attribute_id << 8) | eventByte; 212 de_header_state.de_size--; 213 if (de_header_state.de_size > 0) break; 214 log_debug("parser: Attribute ID: %04x.", attribute_id); 215 216 state = GET_ATTRIBUTE_VALUE_LENGTH; 217 attribute_bytes_received = 0; 218 attribute_bytes_delivered = 0; 219 attribute_value_size = 0; 220 de_state_init(&de_header_state); 221 break; 222 223 case GET_ATTRIBUTE_VALUE_LENGTH: 224 attribute_bytes_received++; 225 sdp_parser_emit_value_byte(eventByte); 226 attribute_bytes_delivered++; 227 if (!de_state_size(eventByte, &de_header_state)) break; 228 229 attribute_value_size = de_header_state.de_size + attribute_bytes_received; 230 231 state = GET_ATTRIBUTE_VALUE; 232 break; 233 234 case GET_ATTRIBUTE_VALUE: 235 attribute_bytes_received++; 236 sdp_parser_emit_value_byte(eventByte); 237 attribute_bytes_delivered++; 238 // log_debug("paser: attribute_bytes_received %u, attribute_value_size %u", attribute_bytes_received, attribute_value_size); 239 240 if (attribute_bytes_received < attribute_value_size) break; 241 // log_debug("parser: Record offset %u, record size %u", record_offset, record_size); 242 if (record_offset != record_size){ 243 state = GET_ATTRIBUTE_ID_HEADER_LENGTH; 244 // log_debug("Get next attribute"); 245 break; 246 } 247 record_offset = 0; 248 // log_debug("parser: List offset %u, list size %u", list_offset, list_size); 249 250 if ((list_size > 0) && (list_offset != list_size)){ 251 record_counter++; 252 state = GET_RECORD_LENGTH; 253 log_debug("parser: END_OF_RECORD"); 254 break; 255 } 256 list_offset = 0; 257 de_state_init(&de_header_state); 258 state = GET_LIST_LENGTH; 259 record_counter = 0; 260 log_debug("parser: END_OF_RECORD & DONE"); 261 break; 262 default: 263 break; 264 } 265 } 266 267 void sdp_parser_init(btstack_packet_handler_t callback){ 268 // init 269 sdp_parser_callback = callback; 270 de_state_init(&de_header_state); 271 state = GET_LIST_LENGTH; 272 list_offset = 0; 273 record_offset = 0; 274 record_counter = 0; 275 } 276 277 void sdp_parser_handle_chunk(uint8_t * data, uint16_t size){ 278 int i; 279 for (i=0;i<size;i++){ 280 sdp_parser_process_byte(data[i]); 281 } 282 } 283 284 #ifdef ENABLE_SDP_EXTRA_QUERIES 285 void sdp_parser_init_service_attribute_search(void){ 286 // init 287 de_state_init(&de_header_state); 288 state = GET_RECORD_LENGTH; 289 list_offset = 0; 290 record_offset = 0; 291 record_counter = 0; 292 } 293 294 void sdp_parser_init_service_search(void){ 295 record_offset = 0; 296 } 297 298 void sdp_parser_handle_service_search(uint8_t * data, uint16_t total_count, uint16_t record_handle_count){ 299 int i; 300 for (i=0;i<record_handle_count;i++){ 301 record_handle = big_endian_read_32(data, i*4); 302 record_counter++; 303 uint8_t event[10]; 304 event[0] = SDP_EVENT_QUERY_SERVICE_RECORD_HANDLE; 305 event[1] = 8; 306 little_endian_store_16(event, 2, total_count); 307 little_endian_store_16(event, 4, record_counter); 308 little_endian_store_32(event, 6, record_handle); 309 (*sdp_parser_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 310 } 311 } 312 #endif 313 314 static void sdp_client_notify_callbacks(void){ 315 if (sdp_client_ready() == false) { 316 return; 317 } 318 btstack_context_callback_registration_t * callback = (btstack_context_callback_registration_t*) btstack_linked_list_pop(&sdp_client_query_requests); 319 if (callback == NULL) { 320 return; 321 } 322 (*callback->callback)(callback->context); 323 } 324 325 void sdp_parser_handle_done(uint8_t status){ 326 // reset state 327 sdp_client_state = INIT; 328 329 // emit query complete event 330 uint8_t event[3]; 331 event[0] = SDP_EVENT_QUERY_COMPLETE; 332 event[1] = 1; 333 event[2] = status; 334 (*sdp_parser_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 335 336 // trigger next query if pending 337 sdp_client_notify_callbacks(); 338 } 339 340 // SDP Client 341 342 // TODO: inline if not needed (des(des)) 343 344 static void sdp_client_parse_attribute_lists(uint8_t* packet, uint16_t length){ 345 sdp_parser_handle_chunk(packet, length); 346 } 347 348 349 static void sdp_client_send_request(uint16_t channel){ 350 351 if (sdp_client_state != W2_SEND) return; 352 353 l2cap_reserve_packet_buffer(); 354 uint8_t * data = l2cap_get_outgoing_buffer(); 355 uint16_t request_len = 0; 356 357 switch (PDU_ID){ 358 #ifdef ENABLE_SDP_EXTRA_QUERIES 359 case SDP_ServiceSearchResponse: 360 request_len = sdp_client_setup_service_search_request(data); 361 break; 362 case SDP_ServiceAttributeResponse: 363 request_len = sdp_client_setup_service_attribute_request(data); 364 break; 365 #endif 366 case SDP_ServiceSearchAttributeResponse: 367 request_len = sdp_client_setup_service_search_attribute_request(data); 368 break; 369 default: 370 log_error("SDP Client sdp_client_send_request :: PDU ID invalid. %u", PDU_ID); 371 return; 372 } 373 374 // prevent re-entrance 375 sdp_client_state = W4_RESPONSE; 376 PDU_ID = SDP_Invalid; 377 l2cap_send_prepared(channel, request_len); 378 } 379 380 381 static void sdp_client_parse_service_search_attribute_response(uint8_t* packet, uint16_t size){ 382 383 uint16_t offset = 3; 384 if ((offset + 2 + 2) > size) return; // parameterLength + attributeListByteCount 385 uint16_t parameterLength = big_endian_read_16(packet,offset); 386 offset+=2; 387 if ((offset + parameterLength) > size) return; 388 389 // AttributeListByteCount <= mtu 390 uint16_t attributeListByteCount = big_endian_read_16(packet,offset); 391 offset+=2; 392 if (attributeListByteCount > mtu){ 393 log_error("Error parsing ServiceSearchAttributeResponse: Number of bytes in found attribute list is larger then the MaximumAttributeByteCount."); 394 return; 395 } 396 397 // AttributeLists 398 if ((offset + attributeListByteCount) > size) return; 399 sdp_client_parse_attribute_lists(packet+offset, attributeListByteCount); 400 offset+=attributeListByteCount; 401 402 // continuation state len 403 if ((offset + 1) > size) return; 404 continuationStateLen = packet[offset]; 405 offset++; 406 if (continuationStateLen > 16){ 407 continuationStateLen = 0; 408 log_error("Error parsing ServiceSearchAttributeResponse: Number of bytes in continuation state exceedes 16."); 409 return; 410 } 411 412 // continuation state 413 if ((offset + continuationStateLen) > size) return; 414 (void)memcpy(continuationState, packet + offset, continuationStateLen); 415 // offset+=continuationStateLen; 416 } 417 418 void sdp_client_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 419 420 // uint16_t handle; 421 if (packet_type == L2CAP_DATA_PACKET){ 422 if (size < 3) return; 423 uint16_t responseTransactionID = big_endian_read_16(packet,1); 424 if (responseTransactionID != transactionID){ 425 log_error("Mismatching transaction ID, expected %u, found %u.", transactionID, responseTransactionID); 426 return; 427 } 428 429 PDU_ID = (SDP_PDU_ID_t)packet[0]; 430 switch (PDU_ID){ 431 case SDP_ErrorResponse: 432 log_error("Received error response with code %u, disconnecting", packet[2]); 433 l2cap_disconnect(sdp_cid, 0); 434 return; 435 #ifdef ENABLE_SDP_EXTRA_QUERIES 436 case SDP_ServiceSearchResponse: 437 sdp_client_parse_service_search_response(packet, size); 438 break; 439 case SDP_ServiceAttributeResponse: 440 sdp_client_parse_service_attribute_response(packet, size); 441 break; 442 #endif 443 case SDP_ServiceSearchAttributeResponse: 444 sdp_client_parse_service_search_attribute_response(packet, size); 445 break; 446 default: 447 log_error("PDU ID %u unexpected/invalid", PDU_ID); 448 return; 449 } 450 451 // continuation set or DONE? 452 if (continuationStateLen == 0){ 453 log_debug("SDP Client Query DONE! "); 454 sdp_client_state = QUERY_COMPLETE; 455 l2cap_disconnect(sdp_cid, 0); 456 return; 457 } 458 // prepare next request and send 459 sdp_client_state = W2_SEND; 460 l2cap_request_can_send_now_event(sdp_cid); 461 return; 462 } 463 464 if (packet_type != HCI_EVENT_PACKET) return; 465 466 switch(hci_event_packet_get_type(packet)){ 467 case L2CAP_EVENT_CHANNEL_OPENED: 468 if (sdp_client_state != W4_CONNECT) break; 469 // data: event (8), len(8), status (8), address(48), handle (16), psm (16), local_cid(16), remote_cid (16), local_mtu(16), remote_mtu(16) 470 if (packet[2]) { 471 log_info("SDP Client Connection failed, status 0x%02x.", packet[2]); 472 sdp_parser_handle_done(packet[2]); 473 break; 474 } 475 sdp_cid = channel; 476 mtu = little_endian_read_16(packet, 17); 477 // handle = little_endian_read_16(packet, 9); 478 log_debug("SDP Client Connected, cid %x, mtu %u.", sdp_cid, mtu); 479 480 sdp_client_state = W2_SEND; 481 l2cap_request_can_send_now_event(sdp_cid); 482 break; 483 484 case L2CAP_EVENT_CAN_SEND_NOW: 485 if(l2cap_event_can_send_now_get_local_cid(packet) == sdp_cid){ 486 sdp_client_send_request(sdp_cid); 487 } 488 break; 489 case L2CAP_EVENT_CHANNEL_CLOSED: { 490 if (sdp_cid != little_endian_read_16(packet, 2)) { 491 // log_info("Received L2CAP_EVENT_CHANNEL_CLOSED for cid %x, current cid %x\n", little_endian_read_16(packet, 2),sdp_cid); 492 break; 493 } 494 log_info("SDP Client disconnected."); 495 uint8_t status = (sdp_client_state == QUERY_COMPLETE) ? 0 : SDP_QUERY_INCOMPLETE; 496 sdp_parser_handle_done(status); 497 break; 498 } 499 default: 500 break; 501 } 502 } 503 504 505 static uint16_t sdp_client_setup_service_search_attribute_request(uint8_t * data){ 506 507 uint16_t offset = 0; 508 transactionID++; 509 // uint8_t SDP_PDU_ID_t.SDP_ServiceSearchRequest; 510 data[offset++] = SDP_ServiceSearchAttributeRequest; 511 // uint16_t transactionID 512 big_endian_store_16(data, offset, transactionID); 513 offset += 2; 514 515 // param legnth 516 offset += 2; 517 518 // parameters: 519 // Service_search_pattern - DES (min 1 UUID, max 12) 520 uint16_t service_search_pattern_len = de_get_len(service_search_pattern); 521 (void)memcpy(data + offset, service_search_pattern, 522 service_search_pattern_len); 523 offset += service_search_pattern_len; 524 525 // MaximumAttributeByteCount - uint16_t 0x0007 - 0xffff -> mtu 526 big_endian_store_16(data, offset, mtu); 527 offset += 2; 528 529 // AttibuteIDList 530 uint16_t attribute_id_list_len = de_get_len(attribute_id_list); 531 (void)memcpy(data + offset, attribute_id_list, attribute_id_list_len); 532 offset += attribute_id_list_len; 533 534 // ContinuationState - uint8_t number of cont. bytes N<=16 535 data[offset++] = continuationStateLen; 536 // - N-bytes previous response from server 537 (void)memcpy(data + offset, continuationState, continuationStateLen); 538 offset += continuationStateLen; 539 540 // uint16_t paramLength 541 big_endian_store_16(data, 3, offset - 5); 542 543 return offset; 544 } 545 546 #ifdef ENABLE_SDP_EXTRA_QUERIES 547 void sdp_client_parse_service_record_handle_list(uint8_t* packet, uint16_t total_count, uint16_t current_count){ 548 sdp_parser_handle_service_search(packet, total_count, current_count); 549 } 550 551 static uint16_t sdp_client_setup_service_search_request(uint8_t * data){ 552 uint16_t offset = 0; 553 transactionID++; 554 // uint8_t SDP_PDU_ID_t.SDP_ServiceSearchRequest; 555 data[offset++] = SDP_ServiceSearchRequest; 556 // uint16_t transactionID 557 big_endian_store_16(data, offset, transactionID); 558 offset += 2; 559 560 // param legnth 561 offset += 2; 562 563 // parameters: 564 // Service_search_pattern - DES (min 1 UUID, max 12) 565 uint16_t service_search_pattern_len = de_get_len(service_search_pattern); 566 (void)memcpy(data + offset, service_search_pattern, 567 service_search_pattern_len); 568 offset += service_search_pattern_len; 569 570 // MaximumAttributeByteCount - uint16_t 0x0007 - 0xffff -> mtu 571 big_endian_store_16(data, offset, mtu); 572 offset += 2; 573 574 // ContinuationState - uint8_t number of cont. bytes N<=16 575 data[offset++] = continuationStateLen; 576 // - N-bytes previous response from server 577 (void)memcpy(data + offset, continuationState, continuationStateLen); 578 offset += continuationStateLen; 579 580 // uint16_t paramLength 581 big_endian_store_16(data, 3, offset - 5); 582 583 return offset; 584 } 585 586 587 static uint16_t sdp_client_setup_service_attribute_request(uint8_t * data){ 588 589 uint16_t offset = 0; 590 transactionID++; 591 // uint8_t SDP_PDU_ID_t.SDP_ServiceSearchRequest; 592 data[offset++] = SDP_ServiceAttributeRequest; 593 // uint16_t transactionID 594 big_endian_store_16(data, offset, transactionID); 595 offset += 2; 596 597 // param legnth 598 offset += 2; 599 600 // parameters: 601 // ServiceRecordHandle 602 big_endian_store_32(data, offset, serviceRecordHandle); 603 offset += 4; 604 605 // MaximumAttributeByteCount - uint16_t 0x0007 - 0xffff -> mtu 606 big_endian_store_16(data, offset, mtu); 607 offset += 2; 608 609 // AttibuteIDList 610 uint16_t attribute_id_list_len = de_get_len(attribute_id_list); 611 (void)memcpy(data + offset, attribute_id_list, attribute_id_list_len); 612 offset += attribute_id_list_len; 613 614 // ContinuationState - uint8_t number of cont. bytes N<=16 615 data[offset++] = continuationStateLen; 616 // - N-bytes previous response from server 617 (void)memcpy(data + offset, continuationState, continuationStateLen); 618 offset += continuationStateLen; 619 620 // uint16_t paramLength 621 big_endian_store_16(data, 3, offset - 5); 622 623 return offset; 624 } 625 626 static void sdp_client_parse_service_search_response(uint8_t* packet, uint16_t size){ 627 628 uint16_t offset = 3; 629 if (offset + 2 + 2 + 2 > size) return; // parameterLength, totalServiceRecordCount, currentServiceRecordCount 630 631 uint16_t parameterLength = big_endian_read_16(packet,offset); 632 offset+=2; 633 if (offset + parameterLength > size) return; 634 635 uint16_t totalServiceRecordCount = big_endian_read_16(packet,offset); 636 offset+=2; 637 638 uint16_t currentServiceRecordCount = big_endian_read_16(packet,offset); 639 offset+=2; 640 if (currentServiceRecordCount > totalServiceRecordCount){ 641 log_error("CurrentServiceRecordCount is larger then TotalServiceRecordCount."); 642 return; 643 } 644 645 if (offset + currentServiceRecordCount * 4 > size) return; 646 sdp_client_parse_service_record_handle_list(packet+offset, totalServiceRecordCount, currentServiceRecordCount); 647 offset+= currentServiceRecordCount * 4; 648 649 if (offset + 1 > size) return; 650 continuationStateLen = packet[offset]; 651 offset++; 652 if (continuationStateLen > 16){ 653 continuationStateLen = 0; 654 log_error("Error parsing ServiceSearchResponse: Number of bytes in continuation state exceedes 16."); 655 return; 656 } 657 if (offset + continuationStateLen > size) return; 658 (void)memcpy(continuationState, packet + offset, continuationStateLen); 659 // offset+=continuationStateLen; 660 } 661 662 static void sdp_client_parse_service_attribute_response(uint8_t* packet, uint16_t size){ 663 664 uint16_t offset = 3; 665 if (offset + 2 + 2 > size) return; // parameterLength, attributeListByteCount 666 uint16_t parameterLength = big_endian_read_16(packet,offset); 667 offset+=2; 668 if (offset+parameterLength > size) return; 669 670 // AttributeListByteCount <= mtu 671 uint16_t attributeListByteCount = big_endian_read_16(packet,offset); 672 offset+=2; 673 if (attributeListByteCount > mtu){ 674 log_error("Error parsing ServiceSearchAttributeResponse: Number of bytes in found attribute list is larger then the MaximumAttributeByteCount."); 675 return; 676 } 677 678 // AttributeLists 679 if (offset+attributeListByteCount > size) return; 680 sdp_client_parse_attribute_lists(packet+offset, attributeListByteCount); 681 offset+=attributeListByteCount; 682 683 // continuationStateLen 684 if (offset + 1 > size) return; 685 continuationStateLen = packet[offset]; 686 offset++; 687 if (continuationStateLen > 16){ 688 continuationStateLen = 0; 689 log_error("Error parsing ServiceAttributeResponse: Number of bytes in continuation state exceedes 16."); 690 return; 691 } 692 if (offset + continuationStateLen > size) return; 693 (void)memcpy(continuationState, packet + offset, continuationStateLen); 694 // offset+=continuationStateLen; 695 } 696 #endif 697 698 // for testing only 699 void sdp_client_reset(void){ 700 sdp_client_state = INIT; 701 } 702 703 // Public API 704 705 bool sdp_client_ready(void){ 706 return sdp_client_state == INIT; 707 } 708 709 uint8_t sdp_client_register_query_callback(btstack_context_callback_registration_t * callback_registration){ 710 bool added = btstack_linked_list_add_tail(&sdp_client_query_requests, (btstack_linked_item_t*) callback_registration); 711 if (!added) return ERROR_CODE_COMMAND_DISALLOWED; 712 sdp_client_notify_callbacks(); 713 return ERROR_CODE_SUCCESS; 714 } 715 716 uint8_t sdp_client_query(btstack_packet_handler_t callback, bd_addr_t remote, const uint8_t * des_service_search_pattern, const uint8_t * des_attribute_id_list){ 717 if (!sdp_client_ready()) return SDP_QUERY_BUSY; 718 719 sdp_parser_init(callback); 720 service_search_pattern = des_service_search_pattern; 721 attribute_id_list = des_attribute_id_list; 722 continuationStateLen = 0; 723 PDU_ID = SDP_ServiceSearchAttributeResponse; 724 725 sdp_client_state = W4_CONNECT; 726 return l2cap_create_channel(sdp_client_packet_handler, remote, BLUETOOTH_PSM_SDP, l2cap_max_mtu(), NULL); 727 } 728 729 uint8_t sdp_client_query_uuid16(btstack_packet_handler_t callback, bd_addr_t remote, uint16_t uuid){ 730 if (!sdp_client_ready()) return SDP_QUERY_BUSY; 731 return sdp_client_query(callback, remote, sdp_service_search_pattern_for_uuid16(uuid), des_attributeIDList); 732 } 733 734 uint8_t sdp_client_query_uuid128(btstack_packet_handler_t callback, bd_addr_t remote, const uint8_t* uuid){ 735 if (!sdp_client_ready()) return SDP_QUERY_BUSY; 736 return sdp_client_query(callback, remote, sdp_service_search_pattern_for_uuid128(uuid), des_attributeIDList); 737 } 738 739 #ifdef ENABLE_SDP_EXTRA_QUERIES 740 uint8_t sdp_client_service_attribute_search(btstack_packet_handler_t callback, bd_addr_t remote, uint32_t search_service_record_handle, const uint8_t * des_attribute_id_list){ 741 if (!sdp_client_ready()) return SDP_QUERY_BUSY; 742 743 sdp_parser_init(callback); 744 serviceRecordHandle = search_service_record_handle; 745 attribute_id_list = des_attribute_id_list; 746 continuationStateLen = 0; 747 PDU_ID = SDP_ServiceAttributeResponse; 748 749 sdp_client_state = W4_CONNECT; 750 l2cap_create_channel(sdp_client_packet_handler, remote, BLUETOOTH_PSM_SDP, l2cap_max_mtu(), NULL); 751 return 0; 752 } 753 754 uint8_t sdp_client_service_search(btstack_packet_handler_t callback, bd_addr_t remote, const uint8_t * des_service_search_pattern){ 755 756 if (!sdp_client_ready()) return SDP_QUERY_BUSY; 757 758 sdp_parser_init(callback); 759 service_search_pattern = des_service_search_pattern; 760 continuationStateLen = 0; 761 PDU_ID = SDP_ServiceSearchResponse; 762 763 sdp_client_state = W4_CONNECT; 764 l2cap_create_channel(sdp_client_packet_handler, remote, BLUETOOTH_PSM_SDP, l2cap_max_mtu(), NULL); 765 return 0; 766 } 767 #endif 768 769