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)) return 0; 64 if (memcmp(&uuid[14], &bluetooth_base_uuid[14], 2)) return 0; 65 return 1; 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 int 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){ 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){ 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) 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){ 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 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){ 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) { 299 required_security_level |= 1; 300 } 301 if (it->flags & ATT_PROPERTY_READ_PERMISSION_BIT_1) { 302 required_security_level |= 2; 303 } 304 if (it->flags & ATT_PROPERTY_READ_PERMISSION_SC) { 305 requires_secure_connection = 1; 306 } 307 break; 308 case ATT_WRITE: 309 if (it->flags & ATT_PROPERTY_WRITE_PERMISSION_BIT_0) { 310 required_security_level |= 1; 311 } 312 if (it->flags & ATT_PROPERTY_WRITE_PERMISSION_BIT_1) { 313 required_security_level |= 2; 314 } 315 if (it->flags & ATT_PROPERTY_WRITE_PERMISSION_SC) { 316 requires_secure_connection = 1; 317 } 318 break; 319 } 320 321 int required_encryption_size = it->flags >> 12; 322 if (required_encryption_size) 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 /* explicit fall through */ 334 case ATT_SECURITY_AUTHENTICATED: 335 if ((att_connection->authenticated == 0) || sc_missing){ 336 return ATT_ERROR_INSUFFICIENT_AUTHENTICATION; 337 } 338 /* explicit 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 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_request2(att_connection_t * att_connection, uint8_t * response_buffer, uint16_t response_buffer_size, 461 uint16_t start_handle, uint16_t end_handle, 462 uint16_t attribute_type, uint16_t attribute_len, uint8_t* attribute_value){ 463 464 UNUSED(att_connection); 465 466 log_info("ATT_FIND_BY_TYPE_VALUE_REQUEST: from %04X to %04X, type %04X, value: ", start_handle, end_handle, attribute_type); 467 log_info_hexdump(attribute_value, attribute_len); 468 uint8_t request_type = ATT_FIND_BY_TYPE_VALUE_REQUEST; 469 470 if ((start_handle > end_handle) || (start_handle == 0)){ 471 return setup_error_invalid_handle(response_buffer, request_type, start_handle); 472 } 473 474 uint16_t offset = 1; 475 uint16_t in_group = 0; 476 uint16_t prev_handle = 0; 477 478 att_iterator_t it; 479 att_iterator_init(&it); 480 while (att_iterator_has_next(&it)){ 481 att_iterator_fetch_next(&it); 482 483 if (it.handle && (it.handle < start_handle)) continue; 484 if (it.handle > end_handle) break; // (1) 485 486 // close current tag, if within a group and a new service definition starts or we reach end of att db 487 if (in_group && 488 ((it.handle == 0) || att_iterator_match_uuid16(&it, GATT_PRIMARY_SERVICE_UUID) || att_iterator_match_uuid16(&it, GATT_SECONDARY_SERVICE_UUID))){ 489 490 log_info("End of group, handle 0x%04x", prev_handle); 491 little_endian_store_16(response_buffer, offset, prev_handle); 492 offset += 2; 493 in_group = 0; 494 495 // check if space for another handle pair available 496 if ((offset + 4) > response_buffer_size){ 497 break; 498 } 499 } 500 501 // keep track of previous handle 502 prev_handle = it.handle; 503 504 // does current attribute match 505 if (it.handle && att_iterator_match_uuid16(&it, attribute_type) && (attribute_len == it.value_len) && (memcmp(attribute_value, it.value, it.value_len) == 0)){ 506 log_info("Begin of group, handle 0x%04x", it.handle); 507 little_endian_store_16(response_buffer, offset, it.handle); 508 offset += 2; 509 in_group = 1; 510 } 511 } 512 513 if (offset == 1){ 514 return setup_error_atribute_not_found(response_buffer, request_type, start_handle); 515 } 516 517 response_buffer[0] = ATT_FIND_BY_TYPE_VALUE_RESPONSE; 518 return offset; 519 } 520 521 static uint16_t handle_find_by_type_value_request(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len, 522 uint8_t * response_buffer, uint16_t response_buffer_size){ 523 int attribute_len = request_len - 7; 524 return handle_find_by_type_value_request2(att_connection, response_buffer, response_buffer_size, little_endian_read_16(request_buffer, 1), 525 little_endian_read_16(request_buffer, 3), little_endian_read_16(request_buffer, 5), attribute_len, &request_buffer[7]); 526 } 527 528 // 529 // MARK: ATT_READ_BY_TYPE_REQUEST 530 // 531 static uint16_t handle_read_by_type_request2(att_connection_t * att_connection, uint8_t * response_buffer, uint16_t response_buffer_size, 532 uint16_t start_handle, uint16_t end_handle, 533 uint16_t attribute_type_len, uint8_t * attribute_type){ 534 535 log_info("ATT_READ_BY_TYPE_REQUEST: from %04X to %04X, type: ", start_handle, end_handle); 536 log_info_hexdump(attribute_type, attribute_type_len); 537 uint8_t request_type = ATT_READ_BY_TYPE_REQUEST; 538 539 if ((start_handle > end_handle) || (start_handle == 0)){ 540 return setup_error_invalid_handle(response_buffer, request_type, start_handle); 541 } 542 543 uint16_t offset = 1; 544 uint16_t pair_len = 0; 545 546 att_iterator_t it; 547 att_iterator_init(&it); 548 uint8_t error_code = 0; 549 uint16_t first_matching_but_unreadable_handle = 0; 550 551 #ifdef ENABLE_ATT_DELAYED_RESPONSE 552 int read_request_pending = 0; 553 #endif 554 555 while (att_iterator_has_next(&it)){ 556 att_iterator_fetch_next(&it); 557 558 if (!it.handle) break; 559 if (it.handle < start_handle) continue; 560 if (it.handle > end_handle) break; // (1) 561 562 // does current attribute match 563 if (!att_iterator_match_uuid(&it, attribute_type, attribute_type_len)) continue; 564 565 // skip handles that cannot be read but rembember that there has been at least one 566 if ((it.flags & ATT_PROPERTY_READ) == 0) { 567 if (first_matching_but_unreadable_handle == 0) { 568 first_matching_but_unreadable_handle = it.handle; 569 } 570 continue; 571 } 572 573 // check security requirements 574 error_code = att_validate_security(att_connection, ATT_READ, &it); 575 if (error_code) break; 576 577 att_update_value_len(&it, att_connection->con_handle); 578 579 #ifdef ENABLE_ATT_DELAYED_RESPONSE 580 if (it.value_len == ATT_READ_RESPONSE_PENDING){ 581 read_request_pending = 1; 582 } 583 if (read_request_pending) continue; 584 #endif 585 586 // check if value has same len as last one 587 uint16_t this_pair_len = 2 + it.value_len; 588 if (offset > 1){ 589 if (pair_len != this_pair_len) { 590 break; 591 } 592 } 593 594 // first 595 if (offset == 1) { 596 pair_len = this_pair_len; 597 response_buffer[offset] = pair_len; 598 offset++; 599 } 600 601 // space? 602 if ((offset + pair_len) > response_buffer_size) { 603 if (offset > 2) break; 604 it.value_len = response_buffer_size - 4; 605 response_buffer[1] = 2 + it.value_len; 606 } 607 608 // store 609 little_endian_store_16(response_buffer, offset, it.handle); 610 offset += 2; 611 uint16_t bytes_copied = att_copy_value(&it, 0, response_buffer + offset, it.value_len, att_connection->con_handle); 612 offset += bytes_copied; 613 } 614 615 #ifdef ENABLE_ATT_DELAYED_RESPONSE 616 if (read_request_pending) return ATT_READ_RESPONSE_PENDING; 617 #endif 618 619 // at least one attribute could be read 620 if (offset > 1){ 621 response_buffer[0] = ATT_READ_BY_TYPE_RESPONSE; 622 return offset; 623 } 624 625 // first attribute had an error 626 if (error_code){ 627 return setup_error(response_buffer, request_type, start_handle, error_code); 628 } 629 630 // no other errors, but all found attributes had been non-readable 631 if (first_matching_but_unreadable_handle){ 632 return setup_error_read_not_permitted(response_buffer, request_type, first_matching_but_unreadable_handle); 633 } 634 635 // attribute not found 636 return setup_error_atribute_not_found(response_buffer, request_type, start_handle); 637 } 638 639 static uint16_t handle_read_by_type_request(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len, 640 uint8_t * response_buffer, uint16_t response_buffer_size){ 641 int attribute_type_len; 642 if (request_len <= 7){ 643 attribute_type_len = 2; 644 } else { 645 attribute_type_len = 16; 646 } 647 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]); 648 } 649 650 // 651 // MARK: ATT_READ_BY_TYPE_REQUEST 652 // 653 static uint16_t handle_read_request2(att_connection_t * att_connection, uint8_t * response_buffer, uint16_t response_buffer_size, uint16_t handle){ 654 655 log_info("ATT_READ_REQUEST: handle %04x", handle); 656 uint8_t request_type = ATT_READ_REQUEST; 657 658 att_iterator_t it; 659 int ok = att_find_handle(&it, handle); 660 if (!ok){ 661 return setup_error_invalid_handle(response_buffer, request_type, handle); 662 } 663 664 // check if handle can be read 665 if ((it.flags & ATT_PROPERTY_READ) == 0) { 666 return setup_error_read_not_permitted(response_buffer, request_type, handle); 667 } 668 669 // check security requirements 670 uint8_t error_code = att_validate_security(att_connection, ATT_READ, &it); 671 if (error_code) { 672 return setup_error(response_buffer, request_type, handle, error_code); 673 } 674 675 att_update_value_len(&it, att_connection->con_handle); 676 677 #ifdef ENABLE_ATT_DELAYED_RESPONSE 678 if (it.value_len == ATT_READ_RESPONSE_PENDING) return ATT_READ_RESPONSE_PENDING; 679 #endif 680 681 uint16_t offset = 1; 682 // limit data 683 if ((offset + it.value_len) > response_buffer_size) { 684 it.value_len = response_buffer_size - 1; 685 } 686 687 // store 688 uint16_t bytes_copied = att_copy_value(&it, 0, response_buffer + offset, it.value_len, att_connection->con_handle); 689 offset += bytes_copied; 690 691 response_buffer[0] = ATT_READ_RESPONSE; 692 return offset; 693 } 694 695 static uint16_t handle_read_request(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len, 696 uint8_t * response_buffer, uint16_t response_buffer_size){ 697 UNUSED(request_len); 698 return handle_read_request2(att_connection, response_buffer, response_buffer_size, little_endian_read_16(request_buffer, 1)); 699 } 700 701 // 702 // MARK: ATT_READ_BLOB_REQUEST 0x0c 703 // 704 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){ 705 log_info("ATT_READ_BLOB_REQUEST: handle %04x, offset %u", handle, value_offset); 706 uint8_t request_type = ATT_READ_BLOB_REQUEST; 707 708 att_iterator_t it; 709 int ok = att_find_handle(&it, handle); 710 if (!ok){ 711 return setup_error_invalid_handle(response_buffer, request_type, handle); 712 } 713 714 // check if handle can be read 715 if ((it.flags & ATT_PROPERTY_READ) == 0) { 716 return setup_error_read_not_permitted(response_buffer, request_type, handle); 717 } 718 719 // check security requirements 720 uint8_t error_code = att_validate_security(att_connection, ATT_READ, &it); 721 if (error_code) { 722 return setup_error(response_buffer, request_type, handle, error_code); 723 } 724 725 att_update_value_len(&it, att_connection->con_handle); 726 727 #ifdef ENABLE_ATT_DELAYED_RESPONSE 728 if (it.value_len == ATT_READ_RESPONSE_PENDING) return ATT_READ_RESPONSE_PENDING; 729 #endif 730 731 if (value_offset > it.value_len){ 732 return setup_error_invalid_offset(response_buffer, request_type, handle); 733 } 734 735 // limit data 736 uint16_t offset = 1; 737 if ((offset + it.value_len - value_offset) > response_buffer_size) { 738 it.value_len = response_buffer_size - 1 + value_offset; 739 } 740 741 // store 742 uint16_t bytes_copied = att_copy_value(&it, value_offset, response_buffer + offset, it.value_len - value_offset, att_connection->con_handle); 743 offset += bytes_copied; 744 745 response_buffer[0] = ATT_READ_BLOB_RESPONSE; 746 return offset; 747 } 748 749 static uint16_t handle_read_blob_request(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len, 750 uint8_t * response_buffer, uint16_t response_buffer_size){ 751 UNUSED(request_len); 752 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)); 753 } 754 755 // 756 // MARK: ATT_READ_MULTIPLE_REQUEST 0x0e 757 // 758 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){ 759 log_info("ATT_READ_MULTIPLE_REQUEST: num handles %u", num_handles); 760 uint8_t request_type = ATT_READ_MULTIPLE_REQUEST; 761 762 // TODO: figure out which error to respond with 763 // if (num_handles < 2){ 764 // return setup_error(response_buffer, ATT_READ_MULTIPLE_REQUEST, handle, ???); 765 // } 766 767 uint16_t offset = 1; 768 769 int i; 770 uint8_t error_code = 0; 771 uint16_t handle = 0; 772 773 #ifdef ENABLE_ATT_DELAYED_RESPONSE 774 int read_request_pending = 0; 775 #endif 776 777 for (i=0;i<num_handles;i++){ 778 handle = little_endian_read_16(handles, i << 1); 779 780 if (handle == 0){ 781 return setup_error_invalid_handle(response_buffer, request_type, handle); 782 } 783 784 att_iterator_t it; 785 786 int ok = att_find_handle(&it, handle); 787 if (!ok){ 788 return setup_error_invalid_handle(response_buffer, request_type, handle); 789 } 790 791 // check if handle can be read 792 if ((it.flags & ATT_PROPERTY_READ) == 0) { 793 error_code = ATT_ERROR_READ_NOT_PERMITTED; 794 break; 795 } 796 797 // check security requirements 798 error_code = att_validate_security(att_connection, ATT_READ, &it); 799 if (error_code) break; 800 801 att_update_value_len(&it, att_connection->con_handle); 802 803 #ifdef ENABLE_ATT_DELAYED_RESPONSE 804 if (it.value_len == ATT_READ_RESPONSE_PENDING) { 805 read_request_pending = 1; 806 } 807 if (read_request_pending) continue; 808 #endif 809 810 // limit data 811 if ((offset + it.value_len) > response_buffer_size) { 812 it.value_len = response_buffer_size - 1; 813 } 814 815 // store 816 uint16_t bytes_copied = att_copy_value(&it, 0, response_buffer + offset, it.value_len, att_connection->con_handle); 817 offset += bytes_copied; 818 } 819 820 if (error_code){ 821 return setup_error(response_buffer, request_type, handle, error_code); 822 } 823 824 response_buffer[0] = ATT_READ_MULTIPLE_RESPONSE; 825 return offset; 826 } 827 static uint16_t handle_read_multiple_request(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len, 828 uint8_t * response_buffer, uint16_t response_buffer_size){ 829 int num_handles = (request_len - 1) >> 1; 830 return handle_read_multiple_request2(att_connection, response_buffer, response_buffer_size, num_handles, &request_buffer[1]); 831 } 832 833 // 834 // MARK: ATT_READ_BY_GROUP_TYPE_REQUEST 0x10 835 // 836 // Only handles GATT_PRIMARY_SERVICE_UUID and GATT_SECONDARY_SERVICE_UUID 837 // Core v4.0, vol 3, part g, 2.5.3 838 // "The «Primary Service» and «Secondary Service» grouping types may be used in the Read By Group Type Request. 839 // The «Characteristic» grouping type shall not be used in the ATT Read By Group Type Request." 840 // 841 // NOTE: doesn't handle DYNAMIC values 842 // 843 // NOTE: we don't check for security as PRIMARY and SECONDAY SERVICE definition shouldn't be protected 844 // Core 4.0, vol 3, part g, 8.1 845 // "The list of services and characteristics that a device supports is not considered private or 846 // confidential information, and therefore the Service and Characteristic Discovery procedures 847 // shall always be permitted. " 848 // 849 static uint16_t handle_read_by_group_type_request2(att_connection_t * att_connection, uint8_t * response_buffer, uint16_t response_buffer_size, 850 uint16_t start_handle, uint16_t end_handle, 851 uint16_t attribute_type_len, uint8_t * attribute_type){ 852 853 UNUSED(att_connection); 854 855 log_info("ATT_READ_BY_GROUP_TYPE_REQUEST: from %04X to %04X, buffer size %u, type: ", start_handle, end_handle, response_buffer_size); 856 log_info_hexdump(attribute_type, attribute_type_len); 857 uint8_t request_type = ATT_READ_BY_GROUP_TYPE_REQUEST; 858 859 if ((start_handle > end_handle) || (start_handle == 0)){ 860 return setup_error_invalid_handle(response_buffer, request_type, start_handle); 861 } 862 863 // assert UUID is primary or secondary service uuid 864 uint16_t uuid16 = uuid16_from_uuid(attribute_type_len, attribute_type); 865 if ((uuid16 != GATT_PRIMARY_SERVICE_UUID) && (uuid16 != GATT_SECONDARY_SERVICE_UUID)){ 866 return setup_error(response_buffer, request_type, start_handle, ATT_ERROR_UNSUPPORTED_GROUP_TYPE); 867 } 868 869 uint16_t offset = 1; 870 uint16_t pair_len = 0; 871 uint16_t in_group = 0; 872 uint16_t group_start_handle = 0; 873 uint8_t const * group_start_value = NULL; 874 uint16_t prev_handle = 0; 875 876 att_iterator_t it; 877 att_iterator_init(&it); 878 while (att_iterator_has_next(&it)){ 879 att_iterator_fetch_next(&it); 880 881 if (it.handle && (it.handle < start_handle)) continue; 882 if (it.handle > end_handle) break; // (1) 883 884 // log_info("Handle 0x%04x", it.handle); 885 886 // close current tag, if within a group and a new service definition starts or we reach end of att db 887 if (in_group && 888 ((it.handle == 0) || att_iterator_match_uuid16(&it, GATT_PRIMARY_SERVICE_UUID) || att_iterator_match_uuid16(&it, GATT_SECONDARY_SERVICE_UUID))){ 889 // log_info("End of group, handle 0x%04x, val_len: %u", prev_handle, pair_len - 4); 890 891 little_endian_store_16(response_buffer, offset, group_start_handle); 892 offset += 2; 893 little_endian_store_16(response_buffer, offset, prev_handle); 894 offset += 2; 895 memcpy(response_buffer + offset, group_start_value, pair_len - 4); 896 offset += pair_len - 4; 897 in_group = 0; 898 899 // check if space for another handle pair available 900 if ((offset + pair_len) > response_buffer_size){ 901 break; 902 } 903 } 904 905 // keep track of previous handle 906 prev_handle = it.handle; 907 908 // does current attribute match 909 // log_info("compare: %04x == %04x", *(uint16_t*) context->attribute_type, *(uint16_t*) uuid); 910 if (it.handle && att_iterator_match_uuid(&it, attribute_type, attribute_type_len)) { 911 912 // check if value has same len as last one 913 uint16_t this_pair_len = 4 + it.value_len; 914 if (offset > 1){ 915 if (this_pair_len != pair_len) { 916 break; 917 } 918 } 919 920 // log_info("Begin of group, handle 0x%04x", it.handle); 921 922 // first 923 if (offset == 1) { 924 pair_len = this_pair_len; 925 response_buffer[offset] = this_pair_len; 926 offset++; 927 } 928 929 group_start_handle = it.handle; 930 group_start_value = it.value; 931 in_group = 1; 932 } 933 } 934 935 if (offset == 1){ 936 return setup_error_atribute_not_found(response_buffer, request_type, start_handle); 937 } 938 939 response_buffer[0] = ATT_READ_BY_GROUP_TYPE_RESPONSE; 940 return offset; 941 } 942 static uint16_t handle_read_by_group_type_request(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len, 943 uint8_t * response_buffer, uint16_t response_buffer_size){ 944 int attribute_type_len; 945 if (request_len <= 7){ 946 attribute_type_len = 2; 947 } else { 948 attribute_type_len = 16; 949 } 950 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]); 951 } 952 953 // 954 // MARK: ATT_WRITE_REQUEST 0x12 955 static uint16_t handle_write_request(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len, 956 uint8_t * response_buffer, uint16_t response_buffer_size){ 957 958 UNUSED(response_buffer_size); 959 960 uint8_t request_type = ATT_WRITE_REQUEST; 961 962 uint16_t handle = little_endian_read_16(request_buffer, 1); 963 att_iterator_t it; 964 int ok = att_find_handle(&it, handle); 965 if (!ok) { 966 return setup_error_invalid_handle(response_buffer, request_type, handle); 967 } 968 if (att_write_callback == NULL) { 969 return setup_error_write_not_permitted(response_buffer, request_type, handle); 970 } 971 if ((it.flags & ATT_PROPERTY_WRITE) == 0) { 972 return setup_error_write_not_permitted(response_buffer, request_type, handle); 973 } 974 if ((it.flags & ATT_PROPERTY_DYNAMIC) == 0) { 975 return setup_error_write_not_permitted(response_buffer, request_type, handle); 976 } 977 // check security requirements 978 int error_code = att_validate_security(att_connection, ATT_WRITE, &it); 979 if (error_code) { 980 return setup_error(response_buffer, request_type, handle, error_code); 981 } 982 att_persistent_ccc_cache(&it); 983 error_code = (*att_write_callback)(att_connection->con_handle, handle, ATT_TRANSACTION_MODE_NONE, 0, request_buffer + 3, request_len - 3); 984 985 #ifdef ENABLE_ATT_DELAYED_RESPONSE 986 if (error_code == ATT_ERROR_WRITE_RESPONSE_PENDING) return ATT_INTERNAL_WRITE_RESPONSE_PENDING; 987 #endif 988 989 if (error_code) { 990 return setup_error(response_buffer, request_type, handle, error_code); 991 } 992 response_buffer[0] = ATT_WRITE_RESPONSE; 993 return 1; 994 } 995 996 // 997 // MARK: ATT_PREPARE_WRITE_REQUEST 0x16 998 static uint16_t handle_prepare_write_request(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len, 999 uint8_t * response_buffer, uint16_t response_buffer_size){ 1000 1001 UNUSED(response_buffer_size); 1002 1003 uint8_t request_type = ATT_PREPARE_WRITE_REQUEST; 1004 1005 uint16_t handle = little_endian_read_16(request_buffer, 1); 1006 uint16_t offset = little_endian_read_16(request_buffer, 3); 1007 if (att_write_callback == NULL) { 1008 return setup_error_write_not_permitted(response_buffer, request_type, handle); 1009 } 1010 att_iterator_t it; 1011 if (att_find_handle(&it, handle) == 0) { 1012 return setup_error_invalid_handle(response_buffer, request_type, handle); 1013 } 1014 if ((it.flags & ATT_PROPERTY_WRITE) == 0) { 1015 return setup_error_write_not_permitted(response_buffer, request_type, handle); 1016 } 1017 if ((it.flags & ATT_PROPERTY_DYNAMIC) == 0) { 1018 return setup_error_write_not_permitted(response_buffer, request_type, handle); 1019 } 1020 // check security requirements 1021 int error_code = att_validate_security(att_connection, ATT_WRITE, &it); 1022 if (error_code) { 1023 return setup_error(response_buffer, request_type, handle, error_code); 1024 } 1025 1026 error_code = (*att_write_callback)(att_connection->con_handle, handle, ATT_TRANSACTION_MODE_ACTIVE, offset, request_buffer + 5, request_len - 5); 1027 switch (error_code){ 1028 case 0: 1029 break; 1030 case ATT_ERROR_INVALID_OFFSET: 1031 case ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LENGTH: 1032 // postpone to execute write request 1033 att_prepare_write_update_errors(error_code, handle); 1034 break; 1035 #ifdef ENABLE_ATT_DELAYED_RESPONSE 1036 case ATT_ERROR_WRITE_RESPONSE_PENDING: 1037 return ATT_INTERNAL_WRITE_RESPONSE_PENDING; 1038 #endif 1039 default: 1040 return setup_error(response_buffer, request_type, handle, error_code); 1041 } 1042 1043 // response: echo request 1044 memcpy(response_buffer, request_buffer, request_len); 1045 response_buffer[0] = ATT_PREPARE_WRITE_RESPONSE; 1046 return request_len; 1047 } 1048 1049 /* 1050 * @brief transcation queue of prepared writes, e.g., after disconnect 1051 */ 1052 void att_clear_transaction_queue(att_connection_t * att_connection){ 1053 (*att_write_callback)(att_connection->con_handle, 0, ATT_TRANSACTION_MODE_CANCEL, 0, NULL, 0); 1054 } 1055 1056 // MARK: ATT_EXECUTE_WRITE_REQUEST 0x18 1057 // NOTE: security has been verified by handle_prepare_write_request 1058 static uint16_t handle_execute_write_request(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len, 1059 uint8_t * response_buffer, uint16_t response_buffer_size){ 1060 1061 UNUSED(request_len); 1062 UNUSED(response_buffer_size); 1063 1064 uint8_t request_type = ATT_EXECUTE_WRITE_REQUEST; 1065 if (request_buffer[1]) { 1066 // validate queued write 1067 if (att_prepare_write_error_code == 0){ 1068 att_prepare_write_error_code = (*att_write_callback)(att_connection->con_handle, 0, ATT_TRANSACTION_MODE_VALIDATE, 0, NULL, 0); 1069 } 1070 #ifdef ENABLE_ATT_DELAYED_RESPONSE 1071 if (att_prepare_write_error_code == ATT_ERROR_WRITE_RESPONSE_PENDING) return ATT_INTERNAL_WRITE_RESPONSE_PENDING; 1072 #endif 1073 // deliver queued errors 1074 if (att_prepare_write_error_code){ 1075 att_clear_transaction_queue(att_connection); 1076 uint8_t error_code = att_prepare_write_error_code; 1077 uint16_t handle = att_prepare_write_error_handle; 1078 att_prepare_write_reset(); 1079 return setup_error(response_buffer, request_type, handle, error_code); 1080 } 1081 att_write_callback(att_connection->con_handle, 0, ATT_TRANSACTION_MODE_EXECUTE, 0, NULL, 0); 1082 } else { 1083 att_clear_transaction_queue(att_connection); 1084 } 1085 response_buffer[0] = ATT_EXECUTE_WRITE_RESPONSE; 1086 return 1; 1087 } 1088 1089 // MARK: ATT_WRITE_COMMAND 0x52 1090 // Core 4.0, vol 3, part F, 3.4.5.3 1091 // "No Error Response or Write Response shall be sent in response to this command" 1092 static void handle_write_command(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len, uint16_t required_flags){ 1093 1094 uint16_t handle = little_endian_read_16(request_buffer, 1); 1095 if (att_write_callback == NULL) return; 1096 1097 att_iterator_t it; 1098 int ok = att_find_handle(&it, handle); 1099 if (!ok) return; 1100 if ((it.flags & ATT_PROPERTY_DYNAMIC) == 0) return; 1101 if ((it.flags & required_flags) == 0) return; 1102 if (att_validate_security(att_connection, ATT_WRITE, &it)) return; 1103 att_persistent_ccc_cache(&it); 1104 (*att_write_callback)(att_connection->con_handle, handle, ATT_TRANSACTION_MODE_NONE, 0, request_buffer + 3, request_len - 3); 1105 } 1106 1107 // MARK: helper for ATT_HANDLE_VALUE_NOTIFICATION and ATT_HANDLE_VALUE_INDICATION 1108 static uint16_t prepare_handle_value(att_connection_t * att_connection, 1109 uint16_t handle, 1110 const uint8_t *value, 1111 uint16_t value_len, 1112 uint8_t * response_buffer){ 1113 little_endian_store_16(response_buffer, 1, handle); 1114 if (value_len > (att_connection->mtu - 3)){ 1115 value_len = att_connection->mtu - 3; 1116 } 1117 memcpy(&response_buffer[3], value, value_len); 1118 return value_len + 3; 1119 } 1120 1121 // MARK: ATT_HANDLE_VALUE_NOTIFICATION 0x1b 1122 uint16_t att_prepare_handle_value_notification(att_connection_t * att_connection, 1123 uint16_t handle, 1124 const uint8_t *value, 1125 uint16_t value_len, 1126 uint8_t * response_buffer){ 1127 1128 response_buffer[0] = ATT_HANDLE_VALUE_NOTIFICATION; 1129 return prepare_handle_value(att_connection, handle, value, value_len, response_buffer); 1130 } 1131 1132 // MARK: ATT_HANDLE_VALUE_INDICATION 0x1d 1133 uint16_t att_prepare_handle_value_indication(att_connection_t * att_connection, 1134 uint16_t handle, 1135 const uint8_t *value, 1136 uint16_t value_len, 1137 uint8_t * response_buffer){ 1138 1139 response_buffer[0] = ATT_HANDLE_VALUE_INDICATION; 1140 return prepare_handle_value(att_connection, handle, value, value_len, response_buffer); 1141 } 1142 1143 // MARK: Dispatcher 1144 uint16_t att_handle_request(att_connection_t * att_connection, 1145 uint8_t * request_buffer, 1146 uint16_t request_len, 1147 uint8_t * response_buffer){ 1148 uint16_t response_len = 0; 1149 uint16_t response_buffer_size = att_connection->mtu; 1150 1151 switch (request_buffer[0]){ 1152 case ATT_EXCHANGE_MTU_REQUEST: 1153 response_len = handle_exchange_mtu_request(att_connection, request_buffer, request_len, response_buffer); 1154 break; 1155 case ATT_FIND_INFORMATION_REQUEST: 1156 response_len = handle_find_information_request(att_connection, request_buffer, request_len,response_buffer, response_buffer_size); 1157 break; 1158 case ATT_FIND_BY_TYPE_VALUE_REQUEST: 1159 response_len = handle_find_by_type_value_request(att_connection, request_buffer, request_len, response_buffer, response_buffer_size); 1160 break; 1161 case ATT_READ_BY_TYPE_REQUEST: 1162 response_len = handle_read_by_type_request(att_connection, request_buffer, request_len, response_buffer, response_buffer_size); 1163 break; 1164 case ATT_READ_REQUEST: 1165 response_len = handle_read_request(att_connection, request_buffer, request_len, response_buffer, response_buffer_size); 1166 break; 1167 case ATT_READ_BLOB_REQUEST: 1168 response_len = handle_read_blob_request(att_connection, request_buffer, request_len, response_buffer, response_buffer_size); 1169 break; 1170 case ATT_READ_MULTIPLE_REQUEST: 1171 response_len = handle_read_multiple_request(att_connection, request_buffer, request_len, response_buffer, response_buffer_size); 1172 break; 1173 case ATT_READ_BY_GROUP_TYPE_REQUEST: 1174 response_len = handle_read_by_group_type_request(att_connection, request_buffer, request_len, response_buffer, response_buffer_size); 1175 break; 1176 case ATT_WRITE_REQUEST: 1177 response_len = handle_write_request(att_connection, request_buffer, request_len, response_buffer, response_buffer_size); 1178 break; 1179 case ATT_PREPARE_WRITE_REQUEST: 1180 response_len = handle_prepare_write_request(att_connection, request_buffer, request_len, response_buffer, response_buffer_size); 1181 break; 1182 case ATT_EXECUTE_WRITE_REQUEST: 1183 response_len = handle_execute_write_request(att_connection, request_buffer, request_len, response_buffer, response_buffer_size); 1184 break; 1185 case ATT_WRITE_COMMAND: 1186 handle_write_command(att_connection, request_buffer, request_len, ATT_PROPERTY_WRITE_WITHOUT_RESPONSE); 1187 break; 1188 #ifdef ENABLE_LE_SIGNED_WRITE 1189 case ATT_SIGNED_WRITE_COMMAND: 1190 handle_write_command(att_connection, request_buffer, request_len, ATT_PROPERTY_AUTHENTICATED_SIGNED_WRITE); 1191 break; 1192 #endif 1193 default: 1194 log_info("Unhandled ATT Command: %02X, DATA: ", request_buffer[0]); 1195 log_info_hexdump(&request_buffer[9], request_len-9); 1196 break; 1197 } 1198 return response_len; 1199 } 1200 1201 // returns 1 if service found. only primary service. 1202 int gatt_server_get_get_handle_range_for_service_with_uuid16(uint16_t uuid16, uint16_t * start_handle, uint16_t * end_handle){ 1203 uint16_t in_group = 0; 1204 uint16_t prev_handle = 0; 1205 1206 uint8_t attribute_value[2]; 1207 int attribute_len = sizeof(attribute_value); 1208 little_endian_store_16(attribute_value, 0, uuid16); 1209 1210 att_iterator_t it; 1211 att_iterator_init(&it); 1212 while (att_iterator_has_next(&it)){ 1213 att_iterator_fetch_next(&it); 1214 int new_service_started = att_iterator_match_uuid16(&it, GATT_PRIMARY_SERVICE_UUID) || att_iterator_match_uuid16(&it, GATT_SECONDARY_SERVICE_UUID); 1215 1216 // close current tag, if within a group and a new service definition starts or we reach end of att db 1217 if (in_group && 1218 ((it.handle == 0) || new_service_started)){ 1219 *end_handle = prev_handle; 1220 return 1; 1221 } 1222 1223 // keep track of previous handle 1224 prev_handle = it.handle; 1225 1226 // check if found 1227 if (it.handle && new_service_started && (attribute_len == it.value_len) && (memcmp(attribute_value, it.value, it.value_len) == 0)){ 1228 *start_handle = it.handle; 1229 in_group = 1; 1230 } 1231 } 1232 return 0; 1233 } 1234 1235 // returns 0 if not found 1236 uint16_t gatt_server_get_value_handle_for_characteristic_with_uuid16(uint16_t start_handle, uint16_t end_handle, uint16_t uuid16){ 1237 att_iterator_t it; 1238 att_iterator_init(&it); 1239 while (att_iterator_has_next(&it)){ 1240 att_iterator_fetch_next(&it); 1241 if (it.handle && (it.handle < start_handle)) continue; 1242 if (it.handle > end_handle) break; // (1) 1243 if (it.handle == 0) break; 1244 if (att_iterator_match_uuid16(&it, uuid16)) return it.handle; 1245 } 1246 return 0; 1247 } 1248 1249 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){ 1250 att_iterator_t it; 1251 att_iterator_init(&it); 1252 int characteristic_found = 0; 1253 while (att_iterator_has_next(&it)){ 1254 att_iterator_fetch_next(&it); 1255 if (it.handle && (it.handle < start_handle)) continue; 1256 if (it.handle > end_handle) break; // (1) 1257 if (it.handle == 0) break; 1258 if (att_iterator_match_uuid16(&it, characteristic_uuid16)){ 1259 characteristic_found = 1; 1260 continue; 1261 } 1262 if (att_iterator_match_uuid16(&it, GATT_PRIMARY_SERVICE_UUID) 1263 || att_iterator_match_uuid16(&it, GATT_SECONDARY_SERVICE_UUID) 1264 || att_iterator_match_uuid16(&it, GATT_CHARACTERISTICS_UUID)){ 1265 if (characteristic_found) break; 1266 continue; 1267 } 1268 if (characteristic_found && att_iterator_match_uuid16(&it, descriptor_uuid16)){ 1269 return it.handle; 1270 } 1271 } 1272 return 0; 1273 } 1274 1275 // returns 0 if not found 1276 uint16_t gatt_server_get_client_configuration_handle_for_characteristic_with_uuid16(uint16_t start_handle, uint16_t end_handle, uint16_t characteristic_uuid16){ 1277 return gatt_server_get_descriptor_handle_for_characteristic_with_uuid16(start_handle, end_handle, characteristic_uuid16, GATT_CLIENT_CHARACTERISTICS_CONFIGURATION); 1278 } 1279 // returns 0 if not found 1280 1281 uint16_t gatt_server_get_server_configuration_handle_for_characteristic_with_uuid16(uint16_t start_handle, uint16_t end_handle, uint16_t characteristic_uuid16){ 1282 return gatt_server_get_descriptor_handle_for_characteristic_with_uuid16(start_handle, end_handle, characteristic_uuid16, GATT_SERVER_CHARACTERISTICS_CONFIGURATION); 1283 } 1284 1285 // returns 1 if service found. only primary service. 1286 int gatt_server_get_get_handle_range_for_service_with_uuid128(const uint8_t * uuid128, uint16_t * start_handle, uint16_t * end_handle){ 1287 uint16_t in_group = 0; 1288 uint16_t prev_handle = 0; 1289 1290 uint8_t attribute_value[16]; 1291 int attribute_len = sizeof(attribute_value); 1292 reverse_128(uuid128, attribute_value); 1293 1294 att_iterator_t it; 1295 att_iterator_init(&it); 1296 while (att_iterator_has_next(&it)){ 1297 att_iterator_fetch_next(&it); 1298 int new_service_started = att_iterator_match_uuid16(&it, GATT_PRIMARY_SERVICE_UUID) || att_iterator_match_uuid16(&it, GATT_SECONDARY_SERVICE_UUID); 1299 1300 // close current tag, if within a group and a new service definition starts or we reach end of att db 1301 if (in_group && 1302 ((it.handle == 0) || new_service_started)){ 1303 *end_handle = prev_handle; 1304 return 1; 1305 } 1306 1307 // keep track of previous handle 1308 prev_handle = it.handle; 1309 1310 // check if found 1311 if (it.handle && new_service_started && (attribute_len == it.value_len) && (memcmp(attribute_value, it.value, it.value_len) == 0)){ 1312 *start_handle = it.handle; 1313 in_group = 1; 1314 } 1315 } 1316 return 0; 1317 } 1318 1319 // returns 0 if not found 1320 uint16_t gatt_server_get_value_handle_for_characteristic_with_uuid128(uint16_t start_handle, uint16_t end_handle, const uint8_t * uuid128){ 1321 uint8_t attribute_value[16]; 1322 reverse_128(uuid128, attribute_value); 1323 att_iterator_t it; 1324 att_iterator_init(&it); 1325 while (att_iterator_has_next(&it)){ 1326 att_iterator_fetch_next(&it); 1327 if (it.handle && (it.handle < start_handle)) continue; 1328 if (it.handle > end_handle) break; // (1) 1329 if (it.handle == 0) break; 1330 if (att_iterator_match_uuid(&it, attribute_value, 16)) return it.handle; 1331 } 1332 return 0; 1333 } 1334 1335 // returns 0 if not found 1336 uint16_t gatt_server_get_client_configuration_handle_for_characteristic_with_uuid128(uint16_t start_handle, uint16_t end_handle, const uint8_t * uuid128){ 1337 uint8_t attribute_value[16]; 1338 reverse_128(uuid128, attribute_value); 1339 att_iterator_t it; 1340 att_iterator_init(&it); 1341 int characteristic_found = 0; 1342 while (att_iterator_has_next(&it)){ 1343 att_iterator_fetch_next(&it); 1344 if (it.handle && (it.handle < start_handle)) continue; 1345 if (it.handle > end_handle) break; // (1) 1346 if (it.handle == 0) break; 1347 if (att_iterator_match_uuid(&it, attribute_value, 16)){ 1348 characteristic_found = 1; 1349 continue; 1350 } 1351 if (att_iterator_match_uuid16(&it, GATT_PRIMARY_SERVICE_UUID) 1352 || att_iterator_match_uuid16(&it, GATT_SECONDARY_SERVICE_UUID) 1353 || att_iterator_match_uuid16(&it, GATT_CHARACTERISTICS_UUID)){ 1354 if (characteristic_found) break; 1355 continue; 1356 } 1357 if (characteristic_found && att_iterator_match_uuid16(&it, GATT_CLIENT_CHARACTERISTICS_CONFIGURATION)){ 1358 return it.handle; 1359 } 1360 } 1361 return 0; 1362 } 1363 1364 1365 // 1-item cache to optimize query during write_callback 1366 static void att_persistent_ccc_cache(att_iterator_t * it){ 1367 att_persistent_ccc_handle = it->handle; 1368 if (it->flags & ATT_PROPERTY_UUID128){ 1369 att_persistent_ccc_uuid16 = 0; 1370 } else { 1371 att_persistent_ccc_uuid16 = little_endian_read_16(it->uuid, 0); 1372 } 1373 } 1374 1375 int att_is_persistent_ccc(uint16_t handle){ 1376 if (handle != att_persistent_ccc_handle){ 1377 att_iterator_t it; 1378 int ok = att_find_handle(&it, handle); 1379 if (!ok) return 0; 1380 att_persistent_ccc_cache(&it); 1381 } 1382 return att_persistent_ccc_uuid16 == GATT_CLIENT_CHARACTERISTICS_CONFIGURATION; 1383 } 1384 1385 // att_read_callback helpers 1386 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){ 1387 if (buffer){ 1388 uint16_t bytes_to_copy = btstack_min(blob_size - offset, buffer_size); 1389 memcpy(buffer, &blob[offset], bytes_to_copy); 1390 return bytes_to_copy; 1391 } else { 1392 return blob_size; 1393 } 1394 } 1395 1396 uint16_t att_read_callback_handle_little_endian_32(uint32_t value, uint16_t offset, uint8_t * buffer, uint16_t buffer_size){ 1397 uint8_t value_buffer[4]; 1398 little_endian_store_32(value_buffer, 0, value); 1399 return att_read_callback_handle_blob(value_buffer, sizeof(value_buffer), offset, buffer, buffer_size); 1400 } 1401 1402 uint16_t att_read_callback_handle_little_endian_16(uint16_t value, uint16_t offset, uint8_t * buffer, uint16_t buffer_size){ 1403 uint8_t value_buffer[2]; 1404 little_endian_store_16(value_buffer, 0, value); 1405 return att_read_callback_handle_blob(value_buffer, sizeof(value_buffer), offset, buffer, buffer_size); 1406 } 1407 1408 uint16_t att_read_callback_handle_byte(uint8_t value, uint16_t offset, uint8_t * buffer, uint16_t buffer_size){ 1409 uint8_t value_buffer[1]; 1410 value_buffer[0] = value; 1411 return att_read_callback_handle_blob(value_buffer, sizeof(value_buffer), offset, buffer, buffer_size); 1412 } 1413