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