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__ "att_db.c" 39 40 #include <string.h> 41 42 #include "ble/att_db.h" 43 #include "ble/core.h" 44 #include "bluetooth.h" 45 #include "btstack_debug.h" 46 #include "btstack_util.h" 47 48 // check for ENABLE_ATT_DELAYED_READ_RESPONSE -> ENABLE_ATT_DELAYED_RESPONSE, 49 #ifdef ENABLE_ATT_DELAYED_READ_RESPONSE 50 #error "ENABLE_ATT_DELAYED_READ_RESPONSE was replaced by ENABLE_ATT_DELAYED_RESPONSE. Please update btstack_config.h" 51 #endif 52 53 typedef enum { 54 ATT_READ, 55 ATT_WRITE, 56 } att_operation_t; 57 58 59 static int is_Bluetooth_Base_UUID(uint8_t const *uuid){ 60 // Bluetooth Base UUID 00000000-0000-1000-8000-00805F9B34FB in little endian 61 static const uint8_t bluetooth_base_uuid[] = { 0xfb, 0x34, 0x9b, 0x5f, 0x80, 0x00, 0x00, 0x80, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; 62 63 if (memcmp(&uuid[0], &bluetooth_base_uuid[0], 12) != 0) return false; 64 if (memcmp(&uuid[14], &bluetooth_base_uuid[14], 2) != 0) return false; 65 return true; 66 67 } 68 69 static uint16_t uuid16_from_uuid(uint16_t uuid_len, uint8_t * uuid){ 70 if (uuid_len == 2) return little_endian_read_16(uuid, 0); 71 if (!is_Bluetooth_Base_UUID(uuid)) return 0; 72 return little_endian_read_16(uuid, 12); 73 } 74 75 // ATT Database 76 77 // new java-style iterator 78 typedef struct att_iterator { 79 // private 80 uint8_t const * att_ptr; 81 // public 82 uint16_t size; 83 uint16_t flags; 84 uint16_t handle; 85 uint8_t const * uuid; 86 uint16_t value_len; 87 uint8_t const * value; 88 } att_iterator_t; 89 90 static void att_persistent_ccc_cache(att_iterator_t * it); 91 92 static uint8_t const * att_db = NULL; 93 static att_read_callback_t att_read_callback = NULL; 94 static att_write_callback_t att_write_callback = NULL; 95 static int att_prepare_write_error_code = 0; 96 static uint16_t att_prepare_write_error_handle = 0x0000; 97 98 // single cache for att_is_persistent_ccc - stores flags before write callback 99 static uint16_t att_persistent_ccc_handle; 100 static uint16_t att_persistent_ccc_uuid16; 101 102 static void att_iterator_init(att_iterator_t *it){ 103 it->att_ptr = att_db; 104 } 105 106 static bool att_iterator_has_next(att_iterator_t *it){ 107 return it->att_ptr != NULL; 108 } 109 110 static void att_iterator_fetch_next(att_iterator_t *it){ 111 it->size = little_endian_read_16(it->att_ptr, 0); 112 if (it->size == 0){ 113 it->flags = 0; 114 it->handle = 0; 115 it->uuid = NULL; 116 it->value_len = 0; 117 it->value = NULL; 118 it->att_ptr = NULL; 119 return; 120 } 121 it->flags = little_endian_read_16(it->att_ptr, 2); 122 it->handle = little_endian_read_16(it->att_ptr, 4); 123 it->uuid = &it->att_ptr[6]; 124 // handle 128 bit UUIDs 125 if ((it->flags & ATT_PROPERTY_UUID128) != 0){ 126 it->value_len = it->size - 22; 127 it->value = &it->att_ptr[22]; 128 } else { 129 it->value_len = it->size - 8; 130 it->value = &it->att_ptr[8]; 131 } 132 // advance AFTER setting values 133 it->att_ptr += it->size; 134 } 135 136 static int att_iterator_match_uuid16(att_iterator_t *it, uint16_t uuid){ 137 if (it->handle == 0) return 0; 138 if (it->flags & ATT_PROPERTY_UUID128){ 139 if (!is_Bluetooth_Base_UUID(it->uuid)) return 0; 140 return little_endian_read_16(it->uuid, 12) == uuid; 141 } 142 return little_endian_read_16(it->uuid, 0) == uuid; 143 } 144 145 static int att_iterator_match_uuid(att_iterator_t *it, uint8_t *uuid, uint16_t uuid_len){ 146 if (it->handle == 0) return 0; 147 // input: UUID16 148 if (uuid_len == 2) { 149 return att_iterator_match_uuid16(it, little_endian_read_16(uuid, 0)); 150 } 151 // input and db: UUID128 152 if ((it->flags & ATT_PROPERTY_UUID128) != 0){ 153 return memcmp(it->uuid, uuid, 16) == 0; 154 } 155 // input: UUID128, db: UUID16 156 if (!is_Bluetooth_Base_UUID(uuid)) return 0; 157 return little_endian_read_16(uuid, 12) == little_endian_read_16(it->uuid, 0); 158 } 159 160 161 static int att_find_handle(att_iterator_t *it, uint16_t handle){ 162 if (handle == 0) return 0; 163 att_iterator_init(it); 164 while (att_iterator_has_next(it)){ 165 att_iterator_fetch_next(it); 166 if (it->handle != handle) continue; 167 return 1; 168 } 169 return 0; 170 } 171 172 // experimental client API 173 uint16_t att_uuid_for_handle(uint16_t attribute_handle){ 174 att_iterator_t it; 175 int ok = att_find_handle(&it, attribute_handle); 176 if (!ok) return 0; 177 if ((it.flags & ATT_PROPERTY_UUID128) != 0) return 0; 178 return little_endian_read_16(it.uuid, 0); 179 } 180 // end of client API 181 182 static void att_update_value_len(att_iterator_t *it, hci_con_handle_t con_handle){ 183 if ((it->flags & ATT_PROPERTY_DYNAMIC) == 0) return; 184 it->value_len = (*att_read_callback)(con_handle, it->handle, 0, NULL, 0); 185 return; 186 } 187 188 // copy attribute value from offset into buffer with given size 189 static int att_copy_value(att_iterator_t *it, uint16_t offset, uint8_t * buffer, uint16_t buffer_size, hci_con_handle_t con_handle){ 190 191 // DYNAMIC 192 if ((it->flags & ATT_PROPERTY_DYNAMIC) != 0){ 193 return (*att_read_callback)(con_handle, it->handle, offset, buffer, buffer_size); 194 } 195 196 // STATIC 197 uint16_t bytes_to_copy = it->value_len - offset; 198 if (bytes_to_copy > buffer_size){ 199 bytes_to_copy = buffer_size; 200 } 201 (void)memcpy(buffer, it->value, bytes_to_copy); 202 return bytes_to_copy; 203 } 204 205 void att_set_db(uint8_t const * db){ 206 // validate db version 207 if (db == NULL) return; 208 if (*db++ != ATT_DB_VERSION){ 209 log_error("ATT DB version differs, please regenerate .h from .gatt file or update att_db_util.c"); 210 return; 211 } 212 att_db = db; 213 } 214 215 void att_set_read_callback(att_read_callback_t callback){ 216 att_read_callback = callback; 217 } 218 219 void att_set_write_callback(att_write_callback_t callback){ 220 att_write_callback = callback; 221 } 222 223 void att_dump_attributes(void){ 224 att_iterator_t it; 225 att_iterator_init(&it); 226 uint8_t uuid128[16]; 227 while (att_iterator_has_next(&it)){ 228 att_iterator_fetch_next(&it); 229 if (it.handle == 0) { 230 log_info("Handle: END"); 231 return; 232 } 233 log_info("Handle: 0x%04x, flags: 0x%04x, uuid: ", it.handle, it.flags); 234 if ((it.flags & ATT_PROPERTY_UUID128) != 0){ 235 reverse_128(it.uuid, uuid128); 236 log_info("%s", uuid128_to_str(uuid128)); 237 } else { 238 log_info("%04x", little_endian_read_16(it.uuid, 0)); 239 } 240 log_info(", value_len: %u, value: ", it.value_len); 241 log_info_hexdump(it.value, it.value_len); 242 } 243 } 244 245 static void att_prepare_write_reset(void){ 246 att_prepare_write_error_code = 0; 247 att_prepare_write_error_handle = 0x0000; 248 } 249 250 static void att_prepare_write_update_errors(uint8_t error_code, uint16_t handle){ 251 // first ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LENGTH has highest priority 252 if ((error_code == ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LENGTH) && (error_code != att_prepare_write_error_code)){ 253 att_prepare_write_error_code = error_code; 254 att_prepare_write_error_handle = handle; 255 return; 256 } 257 // first ATT_ERROR_INVALID_OFFSET is next 258 if ((error_code == ATT_ERROR_INVALID_OFFSET) && (att_prepare_write_error_code == 0)){ 259 att_prepare_write_error_code = error_code; 260 att_prepare_write_error_handle = handle; 261 return; 262 } 263 } 264 265 static uint16_t setup_error(uint8_t * response_buffer, uint16_t request, uint16_t handle, uint8_t error_code){ 266 response_buffer[0] = ATT_ERROR_RESPONSE; 267 response_buffer[1] = request; 268 little_endian_store_16(response_buffer, 2, handle); 269 response_buffer[4] = error_code; 270 return 5; 271 } 272 273 static inline uint16_t setup_error_read_not_permitted(uint8_t * response_buffer, uint16_t request, uint16_t start_handle){ 274 return setup_error(response_buffer, request, start_handle, ATT_ERROR_READ_NOT_PERMITTED); 275 } 276 277 static inline uint16_t setup_error_write_not_permitted(uint8_t * response_buffer, uint16_t request, uint16_t start_handle){ 278 return setup_error(response_buffer, request, start_handle, ATT_ERROR_WRITE_NOT_PERMITTED); 279 } 280 281 static inline uint16_t setup_error_atribute_not_found(uint8_t * response_buffer, uint16_t request, uint16_t start_handle){ 282 return setup_error(response_buffer, request, start_handle, ATT_ERROR_ATTRIBUTE_NOT_FOUND); 283 } 284 285 static inline uint16_t setup_error_invalid_handle(uint8_t * response_buffer, uint16_t request, uint16_t handle){ 286 return setup_error(response_buffer, request, handle, ATT_ERROR_INVALID_HANDLE); 287 } 288 289 static inline uint16_t setup_error_invalid_offset(uint8_t * response_buffer, uint16_t request, uint16_t handle){ 290 return setup_error(response_buffer, request, handle, ATT_ERROR_INVALID_OFFSET); 291 } 292 293 static inline uint16_t setup_error_invalid_pdu(uint8_t *response_buffer, uint16_t request) { 294 return setup_error(response_buffer, request, 0, ATT_ERROR_INVALID_PDU); 295 } 296 297 static uint8_t att_validate_security(att_connection_t * att_connection, att_operation_t operation, att_iterator_t * it){ 298 int required_security_level = 0; 299 int requires_secure_connection = 0; 300 switch (operation){ 301 case ATT_READ: 302 if ((it->flags & ATT_PROPERTY_READ_PERMISSION_BIT_0) != 0){ 303 required_security_level |= 1; 304 } 305 if ((it->flags & ATT_PROPERTY_READ_PERMISSION_BIT_1) != 0){ 306 required_security_level |= 2; 307 } 308 if ((it->flags & ATT_PROPERTY_READ_PERMISSION_SC) != 0){ 309 requires_secure_connection = 1; 310 } 311 break; 312 case ATT_WRITE: 313 if ((it->flags & ATT_PROPERTY_WRITE_PERMISSION_BIT_0) != 0){ 314 required_security_level |= 1; 315 } 316 if ((it->flags & ATT_PROPERTY_WRITE_PERMISSION_BIT_1) != 0){ 317 required_security_level |= 2; 318 } 319 if ((it->flags & ATT_PROPERTY_WRITE_PERMISSION_SC) != 0){ 320 requires_secure_connection = 1; 321 } 322 break; 323 } 324 325 int required_encryption_size = it->flags >> 12; 326 if (required_encryption_size != 0) required_encryption_size++; // store -1 to fit into 4 bit 327 328 log_debug("att_validate_security. flags 0x%04x (=> security level %u, key size %u) authorized %u, authenticated %u, encryption_key_size %u, secure connection %u", 329 it->flags, required_security_level, required_encryption_size, att_connection->authorized, att_connection->authenticated, att_connection->encryption_key_size, att_connection->secure_connection); 330 331 int sc_missing = requires_secure_connection && (att_connection->secure_connection == 0); 332 switch (required_security_level){ 333 case ATT_SECURITY_AUTHORIZED: 334 if ((att_connection->authorized == 0) || sc_missing){ 335 return ATT_ERROR_INSUFFICIENT_AUTHORIZATION; 336 } 337 /* fall through */ 338 case ATT_SECURITY_AUTHENTICATED: 339 if ((att_connection->authenticated == 0) || sc_missing){ 340 return ATT_ERROR_INSUFFICIENT_AUTHENTICATION; 341 } 342 /* fall through */ 343 case ATT_SECURITY_ENCRYPTED: 344 if ((required_encryption_size > 0) && ((att_connection->encryption_key_size == 0) || sc_missing)){ 345 return ATT_ERROR_INSUFFICIENT_ENCRYPTION; 346 } 347 if (required_encryption_size > att_connection->encryption_key_size){ 348 return ATT_ERROR_INSUFFICIENT_ENCRYPTION_KEY_SIZE; 349 } 350 break; 351 default: 352 break; 353 } 354 return ATT_ERROR_SUCCESS; 355 } 356 357 // 358 // MARK: ATT_EXCHANGE_MTU_REQUEST 359 // 360 static uint16_t handle_exchange_mtu_request(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len, 361 uint8_t * response_buffer){ 362 363 if (request_len != 3) return setup_error_invalid_pdu(response_buffer, ATT_EXCHANGE_MTU_REQUEST); 364 365 uint16_t client_rx_mtu = little_endian_read_16(request_buffer, 1); 366 367 // find min(local max mtu, remote mtu) >= ATT_DEFAULT_MTU and use as mtu for this connection 368 uint16_t min_mtu = btstack_min(client_rx_mtu, att_connection->max_mtu); 369 uint16_t new_mtu = btstack_max(ATT_DEFAULT_MTU, min_mtu); 370 att_connection->mtu = new_mtu; 371 372 response_buffer[0] = ATT_EXCHANGE_MTU_RESPONSE; 373 little_endian_store_16(response_buffer, 1, att_connection->mtu); 374 return 3; 375 } 376 377 378 // 379 // MARK: ATT_FIND_INFORMATION_REQUEST 380 // 381 // TODO: handle other types then GATT_PRIMARY_SERVICE_UUID and GATT_SECONDARY_SERVICE_UUID 382 // 383 static uint16_t handle_find_information_request2(att_connection_t * att_connection, uint8_t * response_buffer, uint16_t response_buffer_size, 384 uint16_t start_handle, uint16_t end_handle){ 385 386 UNUSED(att_connection); 387 388 log_info("ATT_FIND_INFORMATION_REQUEST: from %04X to %04X", start_handle, end_handle); 389 uint8_t request_type = ATT_FIND_INFORMATION_REQUEST; 390 391 if ((start_handle > end_handle) || (start_handle == 0)){ 392 return setup_error_invalid_handle(response_buffer, request_type, start_handle); 393 } 394 395 uint16_t offset = 1; 396 uint16_t uuid_len = 0; 397 398 att_iterator_t it; 399 att_iterator_init(&it); 400 while (att_iterator_has_next(&it)){ 401 att_iterator_fetch_next(&it); 402 if (!it.handle) break; 403 if (it.handle > end_handle) break; 404 if (it.handle < start_handle) continue; 405 406 // log_info("Handle 0x%04x", it.handle); 407 408 uint16_t this_uuid_len = (it.flags & ATT_PROPERTY_UUID128) ? 16 : 2; 409 410 // check if value has same len as last one if not first result 411 if (offset > 1){ 412 if (this_uuid_len != uuid_len) { 413 break; 414 } 415 } 416 417 // first 418 if (offset == 1) { 419 uuid_len = this_uuid_len; 420 // set format field 421 response_buffer[offset] = (it.flags & ATT_PROPERTY_UUID128) ? 0x02 : 0x01; 422 offset++; 423 } 424 425 // space? 426 if ((offset + 2 + uuid_len) > response_buffer_size) break; 427 428 // store 429 little_endian_store_16(response_buffer, offset, it.handle); 430 offset += 2; 431 432 (void)memcpy(response_buffer + offset, it.uuid, uuid_len); 433 offset += uuid_len; 434 } 435 436 if (offset == 1){ 437 return setup_error_atribute_not_found(response_buffer, request_type, start_handle); 438 } 439 440 response_buffer[0] = ATT_FIND_INFORMATION_REPLY; 441 return offset; 442 } 443 444 static uint16_t handle_find_information_request(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len, 445 uint8_t * response_buffer, uint16_t response_buffer_size){ 446 447 if (request_len != 5) return setup_error_invalid_pdu(response_buffer, ATT_FIND_INFORMATION_REQUEST); 448 449 uint16_t start_handle = little_endian_read_16(request_buffer, 1); 450 uint16_t end_handle = little_endian_read_16(request_buffer, 3); 451 return handle_find_information_request2(att_connection, response_buffer, response_buffer_size, start_handle, end_handle); 452 } 453 454 // 455 // MARK: ATT_FIND_BY_TYPE_VALUE 456 // 457 // "Only attributes with attribute handles between and including the Starting Handle parameter 458 // and the Ending Handle parameter that match the requested attri- bute type and the attribute 459 // value that have sufficient permissions to allow reading will be returned" -> (1) 460 // 461 // TODO: handle other types then GATT_PRIMARY_SERVICE_UUID and GATT_SECONDARY_SERVICE_UUID 462 // 463 // NOTE: doesn't handle DYNAMIC values 464 // NOTE: only supports 16 bit UUIDs 465 // 466 static uint16_t handle_find_by_type_value_request(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len, 467 uint8_t * response_buffer, uint16_t response_buffer_size){ 468 UNUSED(att_connection); 469 470 if (request_len < 7) return setup_error_invalid_pdu(response_buffer, ATT_FIND_BY_TYPE_VALUE_REQUEST); 471 472 // parse request 473 uint16_t start_handle = little_endian_read_16(request_buffer, 1); 474 uint16_t end_handle = little_endian_read_16(request_buffer, 3); 475 uint16_t attribute_type = little_endian_read_16(request_buffer, 5); 476 const uint8_t *attribute_value = &request_buffer[7]; 477 uint16_t attribute_len = request_len - 7; 478 479 log_info("ATT_FIND_BY_TYPE_VALUE_REQUEST: from %04X to %04X, type %04X, value: ", start_handle, end_handle, attribute_type); 480 log_info_hexdump(attribute_value, attribute_len); 481 uint8_t request_type = ATT_FIND_BY_TYPE_VALUE_REQUEST; 482 483 if ((start_handle > end_handle) || (start_handle == 0)){ 484 return setup_error_invalid_handle(response_buffer, request_type, start_handle); 485 } 486 487 uint16_t offset = 1; 488 uint16_t in_group = 0; 489 uint16_t prev_handle = 0; 490 491 att_iterator_t it; 492 att_iterator_init(&it); 493 while (att_iterator_has_next(&it)){ 494 att_iterator_fetch_next(&it); 495 496 if (it.handle && (it.handle < start_handle)) continue; 497 if (it.handle > end_handle) break; // (1) 498 499 // close current tag, if within a group and a new service definition starts or we reach end of att db 500 if (in_group && 501 ((it.handle == 0) || att_iterator_match_uuid16(&it, GATT_PRIMARY_SERVICE_UUID) || att_iterator_match_uuid16(&it, GATT_SECONDARY_SERVICE_UUID))){ 502 503 log_info("End of group, handle 0x%04x", prev_handle); 504 little_endian_store_16(response_buffer, offset, prev_handle); 505 offset += 2; 506 in_group = 0; 507 508 // check if space for another handle pair available 509 if ((offset + 4) > response_buffer_size){ 510 break; 511 } 512 } 513 514 // keep track of previous handle 515 prev_handle = it.handle; 516 517 // does current attribute match 518 if (it.handle && att_iterator_match_uuid16(&it, attribute_type) && (attribute_len == it.value_len) && (memcmp(attribute_value, it.value, it.value_len) == 0)){ 519 log_info("Begin of group, handle 0x%04x", it.handle); 520 little_endian_store_16(response_buffer, offset, it.handle); 521 offset += 2; 522 in_group = 1; 523 } 524 } 525 526 if (offset == 1){ 527 return setup_error_atribute_not_found(response_buffer, request_type, start_handle); 528 } 529 530 response_buffer[0] = ATT_FIND_BY_TYPE_VALUE_RESPONSE; 531 return offset; 532 } 533 534 // 535 // MARK: ATT_READ_BY_TYPE_REQUEST 536 // 537 static uint16_t handle_read_by_type_request2(att_connection_t * att_connection, uint8_t * response_buffer, uint16_t response_buffer_size, 538 uint16_t start_handle, uint16_t end_handle, 539 uint16_t attribute_type_len, uint8_t * attribute_type){ 540 541 log_info("ATT_READ_BY_TYPE_REQUEST: from %04X to %04X, type: ", start_handle, end_handle); 542 log_info_hexdump(attribute_type, attribute_type_len); 543 uint8_t request_type = ATT_READ_BY_TYPE_REQUEST; 544 545 if ((start_handle > end_handle) || (start_handle == 0)){ 546 return setup_error_invalid_handle(response_buffer, request_type, start_handle); 547 } 548 549 uint16_t offset = 1; 550 uint16_t pair_len = 0; 551 552 att_iterator_t it; 553 att_iterator_init(&it); 554 uint8_t error_code = 0; 555 uint16_t first_matching_but_unreadable_handle = 0; 556 557 #ifdef ENABLE_ATT_DELAYED_RESPONSE 558 bool read_request_pending = false; 559 #endif 560 561 while (att_iterator_has_next(&it)){ 562 att_iterator_fetch_next(&it); 563 564 if (!it.handle) break; 565 if (it.handle < start_handle) continue; 566 if (it.handle > end_handle) break; // (1) 567 568 // does current attribute match 569 if (!att_iterator_match_uuid(&it, attribute_type, attribute_type_len)) continue; 570 571 // skip handles that cannot be read but rembember that there has been at least one 572 if ((it.flags & ATT_PROPERTY_READ) == 0) { 573 if (first_matching_but_unreadable_handle == 0) { 574 first_matching_but_unreadable_handle = it.handle; 575 } 576 continue; 577 } 578 579 // check security requirements 580 error_code = att_validate_security(att_connection, ATT_READ, &it); 581 if (error_code != 0) break; 582 583 att_update_value_len(&it, att_connection->con_handle); 584 585 #ifdef ENABLE_ATT_DELAYED_RESPONSE 586 if (it.value_len == ATT_READ_RESPONSE_PENDING){ 587 read_request_pending = true; 588 } 589 if (read_request_pending) continue; 590 #endif 591 592 // check if value has same len as last one 593 uint16_t this_pair_len = 2 + it.value_len; 594 if (offset > 1){ 595 if (pair_len != this_pair_len) { 596 break; 597 } 598 } 599 600 // first 601 if (offset == 1) { 602 pair_len = this_pair_len; 603 response_buffer[offset] = pair_len; 604 offset++; 605 } 606 607 // space? 608 if ((offset + pair_len) > response_buffer_size) { 609 if (offset > 2) break; 610 it.value_len = response_buffer_size - 4; 611 response_buffer[1] = 2 + it.value_len; 612 } 613 614 // store 615 little_endian_store_16(response_buffer, offset, it.handle); 616 offset += 2; 617 uint16_t bytes_copied = att_copy_value(&it, 0, response_buffer + offset, it.value_len, att_connection->con_handle); 618 offset += bytes_copied; 619 } 620 621 #ifdef ENABLE_ATT_DELAYED_RESPONSE 622 if (read_request_pending) return ATT_READ_RESPONSE_PENDING; 623 #endif 624 625 // at least one attribute could be read 626 if (offset > 1){ 627 response_buffer[0] = ATT_READ_BY_TYPE_RESPONSE; 628 return offset; 629 } 630 631 // first attribute had an error 632 if (error_code != 0){ 633 return setup_error(response_buffer, request_type, start_handle, error_code); 634 } 635 636 // no other errors, but all found attributes had been non-readable 637 if (first_matching_but_unreadable_handle != 0){ 638 return setup_error_read_not_permitted(response_buffer, request_type, first_matching_but_unreadable_handle); 639 } 640 641 // attribute not found 642 return setup_error_atribute_not_found(response_buffer, request_type, start_handle); 643 } 644 645 static uint16_t handle_read_by_type_request(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len, 646 uint8_t * response_buffer, uint16_t response_buffer_size){ 647 648 uint16_t attribute_type_len; 649 switch (request_len){ 650 case 7: 651 attribute_type_len = 2; 652 break; 653 case 21: 654 attribute_type_len = 16; 655 break; 656 default: 657 return setup_error_invalid_pdu(response_buffer, ATT_READ_BY_TYPE_REQUEST); 658 } 659 660 uint16_t start_handle = little_endian_read_16(request_buffer, 1); 661 uint16_t end_handle = little_endian_read_16(request_buffer, 3); 662 return handle_read_by_type_request2(att_connection, response_buffer, response_buffer_size, start_handle, end_handle, attribute_type_len, &request_buffer[5]); 663 } 664 665 // 666 // MARK: ATT_READ_BY_TYPE_REQUEST 667 // 668 static uint16_t handle_read_request2(att_connection_t * att_connection, uint8_t * response_buffer, uint16_t response_buffer_size, uint16_t handle){ 669 670 log_info("ATT_READ_REQUEST: handle %04x", handle); 671 uint8_t request_type = ATT_READ_REQUEST; 672 673 att_iterator_t it; 674 int ok = att_find_handle(&it, handle); 675 if (!ok){ 676 return setup_error_invalid_handle(response_buffer, request_type, handle); 677 } 678 679 // check if handle can be read 680 if ((it.flags & ATT_PROPERTY_READ) == 0) { 681 return setup_error_read_not_permitted(response_buffer, request_type, handle); 682 } 683 684 // check security requirements 685 uint8_t error_code = att_validate_security(att_connection, ATT_READ, &it); 686 if (error_code) { 687 return setup_error(response_buffer, request_type, handle, error_code); 688 } 689 690 att_update_value_len(&it, att_connection->con_handle); 691 692 #ifdef ENABLE_ATT_DELAYED_RESPONSE 693 if (it.value_len == ATT_READ_RESPONSE_PENDING) return ATT_READ_RESPONSE_PENDING; 694 #endif 695 696 uint16_t offset = 1; 697 // limit data 698 if ((offset + it.value_len) > response_buffer_size) { 699 it.value_len = response_buffer_size - 1; 700 } 701 702 // store 703 uint16_t bytes_copied = att_copy_value(&it, 0, response_buffer + offset, it.value_len, att_connection->con_handle); 704 offset += bytes_copied; 705 706 response_buffer[0] = ATT_READ_RESPONSE; 707 return offset; 708 } 709 710 static uint16_t handle_read_request(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len, 711 uint8_t * response_buffer, uint16_t response_buffer_size){ 712 713 if (request_len != 3) return setup_error_invalid_pdu(response_buffer, ATT_READ_REQUEST); 714 715 uint16_t handle = little_endian_read_16(request_buffer, 1); 716 return handle_read_request2(att_connection, response_buffer, response_buffer_size, handle); 717 } 718 719 //s 720 // MARK: ATT_READ_BLOB_REQUEST 0x0c 721 // 722 static uint16_t handle_read_blob_request2(att_connection_t * att_connection, uint8_t * response_buffer, uint16_t response_buffer_size, uint16_t handle, uint16_t value_offset){ 723 log_info("ATT_READ_BLOB_REQUEST: handle %04x, offset %u", handle, value_offset); 724 uint8_t request_type = ATT_READ_BLOB_REQUEST; 725 726 att_iterator_t it; 727 int ok = att_find_handle(&it, handle); 728 if (!ok){ 729 return setup_error_invalid_handle(response_buffer, request_type, handle); 730 } 731 732 // check if handle can be read 733 if ((it.flags & ATT_PROPERTY_READ) == 0) { 734 return setup_error_read_not_permitted(response_buffer, request_type, handle); 735 } 736 737 // check security requirements 738 uint8_t error_code = att_validate_security(att_connection, ATT_READ, &it); 739 if (error_code) { 740 return setup_error(response_buffer, request_type, handle, error_code); 741 } 742 743 att_update_value_len(&it, att_connection->con_handle); 744 745 #ifdef ENABLE_ATT_DELAYED_RESPONSE 746 if (it.value_len == ATT_READ_RESPONSE_PENDING) return ATT_READ_RESPONSE_PENDING; 747 #endif 748 749 if (value_offset > it.value_len){ 750 return setup_error_invalid_offset(response_buffer, request_type, handle); 751 } 752 753 // limit data 754 uint16_t offset = 1; 755 if ((offset + it.value_len - value_offset) > response_buffer_size) { 756 it.value_len = response_buffer_size - 1 + value_offset; 757 } 758 759 // store 760 uint16_t bytes_copied = att_copy_value(&it, value_offset, response_buffer + offset, it.value_len - value_offset, att_connection->con_handle); 761 offset += bytes_copied; 762 763 response_buffer[0] = ATT_READ_BLOB_RESPONSE; 764 return offset; 765 } 766 767 static uint16_t handle_read_blob_request(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len, 768 uint8_t * response_buffer, uint16_t response_buffer_size){ 769 770 if (request_len != 5) return setup_error_invalid_pdu(response_buffer, ATT_READ_BLOB_REQUEST); 771 772 uint16_t handle = little_endian_read_16(request_buffer, 1); 773 uint16_t value_offset = little_endian_read_16(request_buffer, 3); 774 return handle_read_blob_request2(att_connection, response_buffer, response_buffer_size, handle, value_offset); 775 } 776 777 // 778 // MARK: ATT_READ_MULTIPLE_REQUEST 0x0e 779 // 780 static uint16_t handle_read_multiple_request2(att_connection_t * att_connection, uint8_t * response_buffer, uint16_t response_buffer_size, uint16_t num_handles, uint8_t * handles){ 781 log_info("ATT_READ_MULTIPLE_REQUEST: num handles %u", num_handles); 782 uint8_t request_type = ATT_READ_MULTIPLE_REQUEST; 783 784 // TODO: figure out which error to respond with 785 // if (num_handles < 2){ 786 // return setup_error(response_buffer, ATT_READ_MULTIPLE_REQUEST, handle, ???); 787 // } 788 789 uint16_t offset = 1; 790 791 int i; 792 uint8_t error_code = 0; 793 uint16_t handle = 0; 794 795 #ifdef ENABLE_ATT_DELAYED_RESPONSE 796 bool read_request_pending = false; 797 #endif 798 799 for (i=0;i<num_handles;i++){ 800 handle = little_endian_read_16(handles, i << 1); 801 802 if (handle == 0){ 803 return setup_error_invalid_handle(response_buffer, request_type, handle); 804 } 805 806 att_iterator_t it; 807 808 int ok = att_find_handle(&it, handle); 809 if (!ok){ 810 return setup_error_invalid_handle(response_buffer, request_type, handle); 811 } 812 813 // check if handle can be read 814 if ((it.flags & ATT_PROPERTY_READ) == 0) { 815 error_code = ATT_ERROR_READ_NOT_PERMITTED; 816 break; 817 } 818 819 // check security requirements 820 error_code = att_validate_security(att_connection, ATT_READ, &it); 821 if (error_code) break; 822 823 att_update_value_len(&it, att_connection->con_handle); 824 825 #ifdef ENABLE_ATT_DELAYED_RESPONSE 826 if (it.value_len == ATT_READ_RESPONSE_PENDING) { 827 read_request_pending = true; 828 } 829 if (read_request_pending) continue; 830 #endif 831 832 // limit data 833 if ((offset + it.value_len) > response_buffer_size) { 834 it.value_len = response_buffer_size - 1; 835 } 836 837 // store 838 uint16_t bytes_copied = att_copy_value(&it, 0, response_buffer + offset, it.value_len, att_connection->con_handle); 839 offset += bytes_copied; 840 } 841 842 if (error_code){ 843 return setup_error(response_buffer, request_type, handle, error_code); 844 } 845 846 response_buffer[0] = ATT_READ_MULTIPLE_RESPONSE; 847 return offset; 848 } 849 static uint16_t handle_read_multiple_request(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len, 850 uint8_t * response_buffer, uint16_t response_buffer_size){ 851 852 // 1 byte opcode + two or more attribute handles (2 bytes each) 853 if ( (request_len < 5) || ((request_len & 1) == 0) ) return setup_error_invalid_pdu(response_buffer, 854 ATT_READ_MULTIPLE_REQUEST); 855 856 int num_handles = (request_len - 1) >> 1; 857 return handle_read_multiple_request2(att_connection, response_buffer, response_buffer_size, num_handles, &request_buffer[1]); 858 } 859 860 // 861 // MARK: ATT_READ_BY_GROUP_TYPE_REQUEST 0x10 862 // 863 // Only handles GATT_PRIMARY_SERVICE_UUID and GATT_SECONDARY_SERVICE_UUID 864 // Core v4.0, vol 3, part g, 2.5.3 865 // "The «Primary Service» and «Secondary Service» grouping types may be used in the Read By Group Type Request. 866 // The «Characteristic» grouping type shall not be used in the ATT Read By Group Type Request." 867 // 868 // NOTE: doesn't handle DYNAMIC values 869 // 870 // NOTE: we don't check for security as PRIMARY and SECONDAY SERVICE definition shouldn't be protected 871 // Core 4.0, vol 3, part g, 8.1 872 // "The list of services and characteristics that a device supports is not considered private or 873 // confidential information, and therefore the Service and Characteristic Discovery procedures 874 // shall always be permitted. " 875 // 876 static uint16_t handle_read_by_group_type_request2(att_connection_t * att_connection, uint8_t * response_buffer, uint16_t response_buffer_size, 877 uint16_t start_handle, uint16_t end_handle, 878 uint16_t attribute_type_len, uint8_t * attribute_type){ 879 880 UNUSED(att_connection); 881 882 log_info("ATT_READ_BY_GROUP_TYPE_REQUEST: from %04X to %04X, buffer size %u, type: ", start_handle, end_handle, response_buffer_size); 883 log_info_hexdump(attribute_type, attribute_type_len); 884 uint8_t request_type = ATT_READ_BY_GROUP_TYPE_REQUEST; 885 886 if ((start_handle > end_handle) || (start_handle == 0)){ 887 return setup_error_invalid_handle(response_buffer, request_type, start_handle); 888 } 889 890 // assert UUID is primary or secondary service uuid 891 uint16_t uuid16 = uuid16_from_uuid(attribute_type_len, attribute_type); 892 if ((uuid16 != GATT_PRIMARY_SERVICE_UUID) && (uuid16 != GATT_SECONDARY_SERVICE_UUID)){ 893 return setup_error(response_buffer, request_type, start_handle, ATT_ERROR_UNSUPPORTED_GROUP_TYPE); 894 } 895 896 uint16_t offset = 1; 897 uint16_t pair_len = 0; 898 uint16_t in_group = 0; 899 uint16_t group_start_handle = 0; 900 uint8_t const * group_start_value = NULL; 901 uint16_t prev_handle = 0; 902 903 att_iterator_t it; 904 att_iterator_init(&it); 905 while (att_iterator_has_next(&it)){ 906 att_iterator_fetch_next(&it); 907 908 if (it.handle && (it.handle < start_handle)) continue; 909 if (it.handle > end_handle) break; // (1) 910 911 // log_info("Handle 0x%04x", it.handle); 912 913 // close current tag, if within a group and a new service definition starts or we reach end of att db 914 if (in_group && 915 ((it.handle == 0) || att_iterator_match_uuid16(&it, GATT_PRIMARY_SERVICE_UUID) || att_iterator_match_uuid16(&it, GATT_SECONDARY_SERVICE_UUID))){ 916 // log_info("End of group, handle 0x%04x, val_len: %u", prev_handle, pair_len - 4); 917 918 little_endian_store_16(response_buffer, offset, group_start_handle); 919 offset += 2; 920 little_endian_store_16(response_buffer, offset, prev_handle); 921 offset += 2; 922 (void)memcpy(response_buffer + offset, group_start_value, 923 pair_len - 4); 924 offset += pair_len - 4; 925 in_group = 0; 926 927 // check if space for another handle pair available 928 if ((offset + pair_len) > response_buffer_size){ 929 break; 930 } 931 } 932 933 // keep track of previous handle 934 prev_handle = it.handle; 935 936 // does current attribute match 937 // log_info("compare: %04x == %04x", *(uint16_t*) context->attribute_type, *(uint16_t*) uuid); 938 if (it.handle && att_iterator_match_uuid(&it, attribute_type, attribute_type_len)) { 939 940 // check if value has same len as last one 941 uint16_t this_pair_len = 4 + it.value_len; 942 if (offset > 1){ 943 if (this_pair_len != pair_len) { 944 break; 945 } 946 } 947 948 // log_info("Begin of group, handle 0x%04x", it.handle); 949 950 // first 951 if (offset == 1) { 952 pair_len = this_pair_len; 953 response_buffer[offset] = this_pair_len; 954 offset++; 955 } 956 957 group_start_handle = it.handle; 958 group_start_value = it.value; 959 in_group = 1; 960 } 961 } 962 963 if (offset == 1){ 964 return setup_error_atribute_not_found(response_buffer, request_type, start_handle); 965 } 966 967 response_buffer[0] = ATT_READ_BY_GROUP_TYPE_RESPONSE; 968 return offset; 969 } 970 static uint16_t handle_read_by_group_type_request(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len, 971 uint8_t * response_buffer, uint16_t response_buffer_size){ 972 uint16_t attribute_type_len; 973 switch (request_len){ 974 case 7: 975 attribute_type_len = 2; 976 break; 977 case 21: 978 attribute_type_len = 16; 979 break; 980 default: 981 return setup_error_invalid_pdu(response_buffer, ATT_READ_BY_GROUP_TYPE_REQUEST); 982 } 983 984 uint16_t start_handle = little_endian_read_16(request_buffer, 1); 985 uint16_t end_handle = little_endian_read_16(request_buffer, 3); 986 return handle_read_by_group_type_request2(att_connection, response_buffer, response_buffer_size, start_handle, end_handle, attribute_type_len, &request_buffer[5]); 987 } 988 989 // 990 // MARK: ATT_WRITE_REQUEST 0x12 991 static uint16_t handle_write_request(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len, 992 uint8_t * response_buffer, uint16_t response_buffer_size){ 993 994 if (request_len < 3) return setup_error_invalid_pdu(response_buffer, ATT_WRITE_REQUEST); 995 996 uint8_t request_type = ATT_WRITE_REQUEST; 997 998 uint16_t handle = little_endian_read_16(request_buffer, 1); 999 att_iterator_t it; 1000 int ok = att_find_handle(&it, handle); 1001 if (!ok) { 1002 return setup_error_invalid_handle(response_buffer, request_type, handle); 1003 } 1004 if (att_write_callback == NULL) { 1005 return setup_error_write_not_permitted(response_buffer, request_type, handle); 1006 } 1007 if ((it.flags & ATT_PROPERTY_WRITE) == 0) { 1008 return setup_error_write_not_permitted(response_buffer, request_type, handle); 1009 } 1010 if ((it.flags & ATT_PROPERTY_DYNAMIC) == 0) { 1011 return setup_error_write_not_permitted(response_buffer, request_type, handle); 1012 } 1013 // check security requirements 1014 int error_code = att_validate_security(att_connection, ATT_WRITE, &it); 1015 if (error_code) { 1016 return setup_error(response_buffer, request_type, handle, error_code); 1017 } 1018 att_persistent_ccc_cache(&it); 1019 error_code = (*att_write_callback)(att_connection->con_handle, handle, ATT_TRANSACTION_MODE_NONE, 0, request_buffer + 3, request_len - 3); 1020 1021 #ifdef ENABLE_ATT_DELAYED_RESPONSE 1022 if (error_code == ATT_ERROR_WRITE_RESPONSE_PENDING) return ATT_INTERNAL_WRITE_RESPONSE_PENDING; 1023 #endif 1024 1025 if (error_code) { 1026 return setup_error(response_buffer, request_type, handle, error_code); 1027 } 1028 response_buffer[0] = ATT_WRITE_RESPONSE; 1029 return 1; 1030 } 1031 1032 // 1033 // MARK: ATT_PREPARE_WRITE_REQUEST 0x16 1034 static uint16_t handle_prepare_write_request(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len, 1035 uint8_t * response_buffer, uint16_t response_buffer_size){ 1036 1037 UNUSED(response_buffer_size); 1038 1039 uint8_t request_type = ATT_PREPARE_WRITE_REQUEST; 1040 1041 if (request_len < 5) return setup_error_invalid_pdu(response_buffer, request_type); 1042 1043 uint16_t handle = little_endian_read_16(request_buffer, 1); 1044 uint16_t offset = little_endian_read_16(request_buffer, 3); 1045 if (att_write_callback == NULL) { 1046 return setup_error_write_not_permitted(response_buffer, request_type, handle); 1047 } 1048 att_iterator_t it; 1049 if (att_find_handle(&it, handle) == 0) { 1050 return setup_error_invalid_handle(response_buffer, request_type, handle); 1051 } 1052 if ((it.flags & ATT_PROPERTY_WRITE) == 0) { 1053 return setup_error_write_not_permitted(response_buffer, request_type, handle); 1054 } 1055 if ((it.flags & ATT_PROPERTY_DYNAMIC) == 0) { 1056 return setup_error_write_not_permitted(response_buffer, request_type, handle); 1057 } 1058 // check security requirements 1059 int error_code = att_validate_security(att_connection, ATT_WRITE, &it); 1060 if (error_code) { 1061 return setup_error(response_buffer, request_type, handle, error_code); 1062 } 1063 1064 error_code = (*att_write_callback)(att_connection->con_handle, handle, ATT_TRANSACTION_MODE_ACTIVE, offset, request_buffer + 5, request_len - 5); 1065 switch (error_code){ 1066 case 0: 1067 break; 1068 case ATT_ERROR_INVALID_OFFSET: 1069 case ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LENGTH: 1070 // postpone to execute write request 1071 att_prepare_write_update_errors(error_code, handle); 1072 break; 1073 #ifdef ENABLE_ATT_DELAYED_RESPONSE 1074 case ATT_ERROR_WRITE_RESPONSE_PENDING: 1075 return ATT_INTERNAL_WRITE_RESPONSE_PENDING; 1076 #endif 1077 default: 1078 return setup_error(response_buffer, request_type, handle, error_code); 1079 } 1080 1081 // response: echo request 1082 (void)memcpy(response_buffer, request_buffer, request_len); 1083 response_buffer[0] = ATT_PREPARE_WRITE_RESPONSE; 1084 return request_len; 1085 } 1086 1087 /* 1088 * @brief transcation queue of prepared writes, e.g., after disconnect 1089 */ 1090 void att_clear_transaction_queue(att_connection_t * att_connection){ 1091 (*att_write_callback)(att_connection->con_handle, 0, ATT_TRANSACTION_MODE_CANCEL, 0, NULL, 0); 1092 } 1093 1094 // MARK: ATT_EXECUTE_WRITE_REQUEST 0x18 1095 // NOTE: security has been verified by handle_prepare_write_request 1096 static uint16_t handle_execute_write_request(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len, 1097 uint8_t * response_buffer, uint16_t response_buffer_size){ 1098 1099 UNUSED(response_buffer_size); 1100 1101 uint8_t request_type = ATT_EXECUTE_WRITE_REQUEST; 1102 1103 if (request_len < 2) return setup_error_invalid_pdu(response_buffer, request_type); 1104 1105 if (att_write_callback == NULL) { 1106 return setup_error_write_not_permitted(response_buffer, request_type, 0); 1107 } 1108 1109 if (request_buffer[1]) { 1110 // validate queued write 1111 if (att_prepare_write_error_code == 0){ 1112 att_prepare_write_error_code = (*att_write_callback)(att_connection->con_handle, 0, ATT_TRANSACTION_MODE_VALIDATE, 0, NULL, 0); 1113 } 1114 #ifdef ENABLE_ATT_DELAYED_RESPONSE 1115 if (att_prepare_write_error_code == ATT_ERROR_WRITE_RESPONSE_PENDING) return ATT_INTERNAL_WRITE_RESPONSE_PENDING; 1116 #endif 1117 // deliver queued errors 1118 if (att_prepare_write_error_code){ 1119 att_clear_transaction_queue(att_connection); 1120 uint8_t error_code = att_prepare_write_error_code; 1121 uint16_t handle = att_prepare_write_error_handle; 1122 att_prepare_write_reset(); 1123 return setup_error(response_buffer, request_type, handle, error_code); 1124 } 1125 att_write_callback(att_connection->con_handle, 0, ATT_TRANSACTION_MODE_EXECUTE, 0, NULL, 0); 1126 } else { 1127 att_clear_transaction_queue(att_connection); 1128 } 1129 response_buffer[0] = ATT_EXECUTE_WRITE_RESPONSE; 1130 return 1; 1131 } 1132 1133 // MARK: ATT_WRITE_COMMAND 0x52 1134 // Core 4.0, vol 3, part F, 3.4.5.3 1135 // "No Error Response or Write Response shall be sent in response to this command" 1136 static void handle_write_command(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len, uint16_t required_flags){ 1137 1138 if (request_len < 3) return; 1139 1140 uint16_t handle = little_endian_read_16(request_buffer, 1); 1141 if (att_write_callback == NULL) return; 1142 1143 att_iterator_t it; 1144 int ok = att_find_handle(&it, handle); 1145 if (!ok) return; 1146 if ((it.flags & ATT_PROPERTY_DYNAMIC) == 0) return; 1147 if ((it.flags & required_flags) == 0) return; 1148 if (att_validate_security(att_connection, ATT_WRITE, &it)) return; 1149 att_persistent_ccc_cache(&it); 1150 (*att_write_callback)(att_connection->con_handle, handle, ATT_TRANSACTION_MODE_NONE, 0, request_buffer + 3, request_len - 3); 1151 } 1152 1153 // MARK: helper for ATT_HANDLE_VALUE_NOTIFICATION and ATT_HANDLE_VALUE_INDICATION 1154 static uint16_t prepare_handle_value(att_connection_t * att_connection, 1155 uint16_t handle, 1156 const uint8_t *value, 1157 uint16_t value_len, 1158 uint8_t * response_buffer){ 1159 little_endian_store_16(response_buffer, 1, handle); 1160 if (value_len > (att_connection->mtu - 3)){ 1161 value_len = att_connection->mtu - 3; 1162 } 1163 (void)memcpy(&response_buffer[3], value, value_len); 1164 return value_len + 3; 1165 } 1166 1167 // MARK: ATT_HANDLE_VALUE_NOTIFICATION 0x1b 1168 uint16_t att_prepare_handle_value_notification(att_connection_t * att_connection, 1169 uint16_t handle, 1170 const uint8_t *value, 1171 uint16_t value_len, 1172 uint8_t * response_buffer){ 1173 1174 response_buffer[0] = ATT_HANDLE_VALUE_NOTIFICATION; 1175 return prepare_handle_value(att_connection, handle, value, value_len, response_buffer); 1176 } 1177 1178 // MARK: ATT_HANDLE_VALUE_INDICATION 0x1d 1179 uint16_t att_prepare_handle_value_indication(att_connection_t * att_connection, 1180 uint16_t handle, 1181 const uint8_t *value, 1182 uint16_t value_len, 1183 uint8_t * response_buffer){ 1184 1185 response_buffer[0] = ATT_HANDLE_VALUE_INDICATION; 1186 return prepare_handle_value(att_connection, handle, value, value_len, response_buffer); 1187 } 1188 1189 // MARK: Dispatcher 1190 uint16_t att_handle_request(att_connection_t * att_connection, 1191 uint8_t * request_buffer, 1192 uint16_t request_len, 1193 uint8_t * response_buffer){ 1194 uint16_t response_len = 0; 1195 uint16_t response_buffer_size = att_connection->mtu; 1196 1197 switch (request_buffer[0]){ 1198 case ATT_EXCHANGE_MTU_REQUEST: 1199 response_len = handle_exchange_mtu_request(att_connection, request_buffer, request_len, response_buffer); 1200 break; 1201 case ATT_FIND_INFORMATION_REQUEST: 1202 response_len = handle_find_information_request(att_connection, request_buffer, request_len,response_buffer, response_buffer_size); 1203 break; 1204 case ATT_FIND_BY_TYPE_VALUE_REQUEST: 1205 response_len = handle_find_by_type_value_request(att_connection, request_buffer, request_len, response_buffer, response_buffer_size); 1206 break; 1207 case ATT_READ_BY_TYPE_REQUEST: 1208 response_len = handle_read_by_type_request(att_connection, request_buffer, request_len, response_buffer, response_buffer_size); 1209 break; 1210 case ATT_READ_REQUEST: 1211 response_len = handle_read_request(att_connection, request_buffer, request_len, response_buffer, response_buffer_size); 1212 break; 1213 case ATT_READ_BLOB_REQUEST: 1214 response_len = handle_read_blob_request(att_connection, request_buffer, request_len, response_buffer, response_buffer_size); 1215 break; 1216 case ATT_READ_MULTIPLE_REQUEST: 1217 response_len = handle_read_multiple_request(att_connection, request_buffer, request_len, response_buffer, response_buffer_size); 1218 break; 1219 case ATT_READ_BY_GROUP_TYPE_REQUEST: 1220 response_len = handle_read_by_group_type_request(att_connection, request_buffer, request_len, response_buffer, response_buffer_size); 1221 break; 1222 case ATT_WRITE_REQUEST: 1223 response_len = handle_write_request(att_connection, request_buffer, request_len, response_buffer, response_buffer_size); 1224 break; 1225 case ATT_PREPARE_WRITE_REQUEST: 1226 response_len = handle_prepare_write_request(att_connection, request_buffer, request_len, response_buffer, response_buffer_size); 1227 break; 1228 case ATT_EXECUTE_WRITE_REQUEST: 1229 response_len = handle_execute_write_request(att_connection, request_buffer, request_len, response_buffer, response_buffer_size); 1230 break; 1231 case ATT_WRITE_COMMAND: 1232 handle_write_command(att_connection, request_buffer, request_len, ATT_PROPERTY_WRITE_WITHOUT_RESPONSE); 1233 break; 1234 #ifdef ENABLE_LE_SIGNED_WRITE 1235 case ATT_SIGNED_WRITE_COMMAND: 1236 handle_write_command(att_connection, request_buffer, request_len, ATT_PROPERTY_AUTHENTICATED_SIGNED_WRITE); 1237 break; 1238 #endif 1239 default: 1240 log_info("Unhandled ATT Command: %02X, DATA: ", request_buffer[0]); 1241 log_info_hexdump(&request_buffer[9], request_len-9); 1242 break; 1243 } 1244 return response_len; 1245 } 1246 1247 // returns 1 if service found. only primary service. 1248 bool gatt_server_get_get_handle_range_for_service_with_uuid16(uint16_t uuid16, uint16_t * start_handle, uint16_t * end_handle){ 1249 uint16_t in_group = 0; 1250 uint16_t prev_handle = 0; 1251 1252 uint8_t attribute_value[2]; 1253 int attribute_len = sizeof(attribute_value); 1254 little_endian_store_16(attribute_value, 0, uuid16); 1255 1256 att_iterator_t it; 1257 att_iterator_init(&it); 1258 while (att_iterator_has_next(&it)){ 1259 att_iterator_fetch_next(&it); 1260 int new_service_started = att_iterator_match_uuid16(&it, GATT_PRIMARY_SERVICE_UUID) || att_iterator_match_uuid16(&it, GATT_SECONDARY_SERVICE_UUID); 1261 1262 // close current tag, if within a group and a new service definition starts or we reach end of att db 1263 if (in_group && 1264 ((it.handle == 0) || new_service_started)){ 1265 *end_handle = prev_handle; 1266 return true; 1267 } 1268 1269 // keep track of previous handle 1270 prev_handle = it.handle; 1271 1272 // check if found 1273 if (it.handle && new_service_started && (attribute_len == it.value_len) && (memcmp(attribute_value, it.value, it.value_len) == 0)){ 1274 *start_handle = it.handle; 1275 in_group = true; 1276 } 1277 } 1278 return false; 1279 } 1280 1281 // returns false if not found 1282 uint16_t gatt_server_get_value_handle_for_characteristic_with_uuid16(uint16_t start_handle, uint16_t end_handle, uint16_t uuid16){ 1283 att_iterator_t it; 1284 att_iterator_init(&it); 1285 while (att_iterator_has_next(&it)){ 1286 att_iterator_fetch_next(&it); 1287 if (it.handle && (it.handle < start_handle)) continue; 1288 if (it.handle > end_handle) break; // (1) 1289 if (it.handle == 0) break; 1290 if (att_iterator_match_uuid16(&it, uuid16)) return it.handle; 1291 } 1292 return 0; 1293 } 1294 1295 uint16_t gatt_server_get_descriptor_handle_for_characteristic_with_uuid16(uint16_t start_handle, uint16_t end_handle, uint16_t characteristic_uuid16, uint16_t descriptor_uuid16){ 1296 att_iterator_t it; 1297 att_iterator_init(&it); 1298 int characteristic_found = 0; 1299 while (att_iterator_has_next(&it)){ 1300 att_iterator_fetch_next(&it); 1301 if (it.handle && (it.handle < start_handle)) continue; 1302 if (it.handle > end_handle) break; // (1) 1303 if (it.handle == 0) break; 1304 if (att_iterator_match_uuid16(&it, characteristic_uuid16)){ 1305 characteristic_found = 1; 1306 continue; 1307 } 1308 if (att_iterator_match_uuid16(&it, GATT_PRIMARY_SERVICE_UUID) 1309 || att_iterator_match_uuid16(&it, GATT_SECONDARY_SERVICE_UUID) 1310 || att_iterator_match_uuid16(&it, GATT_CHARACTERISTICS_UUID)){ 1311 if (characteristic_found) break; 1312 continue; 1313 } 1314 if (characteristic_found && att_iterator_match_uuid16(&it, descriptor_uuid16)){ 1315 return it.handle; 1316 } 1317 } 1318 return 0; 1319 } 1320 1321 // returns 0 if not found 1322 uint16_t gatt_server_get_client_configuration_handle_for_characteristic_with_uuid16(uint16_t start_handle, uint16_t end_handle, uint16_t characteristic_uuid16){ 1323 return gatt_server_get_descriptor_handle_for_characteristic_with_uuid16(start_handle, end_handle, characteristic_uuid16, GATT_CLIENT_CHARACTERISTICS_CONFIGURATION); 1324 } 1325 // returns 0 if not found 1326 1327 uint16_t gatt_server_get_server_configuration_handle_for_characteristic_with_uuid16(uint16_t start_handle, uint16_t end_handle, uint16_t characteristic_uuid16){ 1328 return gatt_server_get_descriptor_handle_for_characteristic_with_uuid16(start_handle, end_handle, characteristic_uuid16, GATT_SERVER_CHARACTERISTICS_CONFIGURATION); 1329 } 1330 1331 // returns 1 if service found. only primary service. 1332 int gatt_server_get_get_handle_range_for_service_with_uuid128(const uint8_t * uuid128, uint16_t * start_handle, uint16_t * end_handle){ 1333 uint16_t in_group = 0; 1334 uint16_t prev_handle = 0; 1335 1336 uint8_t attribute_value[16]; 1337 int attribute_len = sizeof(attribute_value); 1338 reverse_128(uuid128, attribute_value); 1339 1340 att_iterator_t it; 1341 att_iterator_init(&it); 1342 while (att_iterator_has_next(&it)){ 1343 att_iterator_fetch_next(&it); 1344 int new_service_started = att_iterator_match_uuid16(&it, GATT_PRIMARY_SERVICE_UUID) || att_iterator_match_uuid16(&it, GATT_SECONDARY_SERVICE_UUID); 1345 1346 // close current tag, if within a group and a new service definition starts or we reach end of att db 1347 if (in_group && 1348 ((it.handle == 0) || new_service_started)){ 1349 *end_handle = prev_handle; 1350 return 1; 1351 } 1352 1353 // keep track of previous handle 1354 prev_handle = it.handle; 1355 1356 // check if found 1357 if (it.handle && new_service_started && (attribute_len == it.value_len) && (memcmp(attribute_value, it.value, it.value_len) == 0)){ 1358 *start_handle = it.handle; 1359 in_group = 1; 1360 } 1361 } 1362 return 0; 1363 } 1364 1365 // returns 0 if not found 1366 uint16_t gatt_server_get_value_handle_for_characteristic_with_uuid128(uint16_t start_handle, uint16_t end_handle, const uint8_t * uuid128){ 1367 uint8_t attribute_value[16]; 1368 reverse_128(uuid128, attribute_value); 1369 att_iterator_t it; 1370 att_iterator_init(&it); 1371 while (att_iterator_has_next(&it)){ 1372 att_iterator_fetch_next(&it); 1373 if (it.handle && (it.handle < start_handle)) continue; 1374 if (it.handle > end_handle) break; // (1) 1375 if (it.handle == 0) break; 1376 if (att_iterator_match_uuid(&it, attribute_value, 16)) return it.handle; 1377 } 1378 return 0; 1379 } 1380 1381 // returns 0 if not found 1382 uint16_t gatt_server_get_client_configuration_handle_for_characteristic_with_uuid128(uint16_t start_handle, uint16_t end_handle, const uint8_t * uuid128){ 1383 uint8_t attribute_value[16]; 1384 reverse_128(uuid128, attribute_value); 1385 att_iterator_t it; 1386 att_iterator_init(&it); 1387 int characteristic_found = 0; 1388 while (att_iterator_has_next(&it)){ 1389 att_iterator_fetch_next(&it); 1390 if (it.handle && (it.handle < start_handle)) continue; 1391 if (it.handle > end_handle) break; // (1) 1392 if (it.handle == 0) break; 1393 if (att_iterator_match_uuid(&it, attribute_value, 16)){ 1394 characteristic_found = 1; 1395 continue; 1396 } 1397 if (att_iterator_match_uuid16(&it, GATT_PRIMARY_SERVICE_UUID) 1398 || att_iterator_match_uuid16(&it, GATT_SECONDARY_SERVICE_UUID) 1399 || att_iterator_match_uuid16(&it, GATT_CHARACTERISTICS_UUID)){ 1400 if (characteristic_found) break; 1401 continue; 1402 } 1403 if (characteristic_found && att_iterator_match_uuid16(&it, GATT_CLIENT_CHARACTERISTICS_CONFIGURATION)){ 1404 return it.handle; 1405 } 1406 } 1407 return 0; 1408 } 1409 1410 1411 // 1-item cache to optimize query during write_callback 1412 static void att_persistent_ccc_cache(att_iterator_t * it){ 1413 att_persistent_ccc_handle = it->handle; 1414 if (it->flags & ATT_PROPERTY_UUID128){ 1415 att_persistent_ccc_uuid16 = 0; 1416 } else { 1417 att_persistent_ccc_uuid16 = little_endian_read_16(it->uuid, 0); 1418 } 1419 } 1420 1421 bool att_is_persistent_ccc(uint16_t handle){ 1422 if (handle != att_persistent_ccc_handle){ 1423 att_iterator_t it; 1424 int ok = att_find_handle(&it, handle); 1425 if (!ok) return false; 1426 att_persistent_ccc_cache(&it); 1427 } 1428 return att_persistent_ccc_uuid16 == GATT_CLIENT_CHARACTERISTICS_CONFIGURATION; 1429 } 1430 1431 // att_read_callback helpers 1432 uint16_t att_read_callback_handle_blob(const uint8_t * blob, uint16_t blob_size, uint16_t offset, uint8_t * buffer, uint16_t buffer_size){ 1433 if (buffer){ 1434 uint16_t bytes_to_copy = btstack_min(blob_size - offset, buffer_size); 1435 (void)memcpy(buffer, &blob[offset], bytes_to_copy); 1436 return bytes_to_copy; 1437 } else { 1438 return blob_size; 1439 } 1440 } 1441 1442 uint16_t att_read_callback_handle_little_endian_32(uint32_t value, uint16_t offset, uint8_t * buffer, uint16_t buffer_size){ 1443 uint8_t value_buffer[4]; 1444 little_endian_store_32(value_buffer, 0, value); 1445 return att_read_callback_handle_blob(value_buffer, sizeof(value_buffer), offset, buffer, buffer_size); 1446 } 1447 1448 uint16_t att_read_callback_handle_little_endian_16(uint16_t value, uint16_t offset, uint8_t * buffer, uint16_t buffer_size){ 1449 uint8_t value_buffer[2]; 1450 little_endian_store_16(value_buffer, 0, value); 1451 return att_read_callback_handle_blob(value_buffer, sizeof(value_buffer), offset, buffer, buffer_size); 1452 } 1453 1454 uint16_t att_read_callback_handle_byte(uint8_t value, uint16_t offset, uint8_t * buffer, uint16_t buffer_size){ 1455 uint8_t value_buffer[1]; 1456 value_buffer[0] = value; 1457 return att_read_callback_handle_blob(value_buffer, sizeof(value_buffer), offset, buffer, buffer_size); 1458 } 1459