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 #include <stdlib.h> 39 #include <string.h> 40 41 #include "att_db_util.h" 42 #include "ble/att.h" 43 #include "utils.h" 44 #include "btstack_debug.h" 45 #include "bluetooth.h" 46 47 // ATT DB Storage 48 #ifndef HAVE_MALLOC 49 #ifdef MAX_ATT_DB_SIZE 50 static uint8_t att_db_storage[MAX_ATT_DB_SIZE]; 51 #else 52 #error Neither HAVE_MALLOC] nor MAX_ATT_DB_SIZE is defined. 53 #endif 54 #endif 55 56 static uint8_t * att_db; 57 static uint16_t att_db_size; 58 static uint16_t att_db_max_size; 59 static uint16_t att_db_next_handle; 60 61 static void att_db_util_set_end_tag(void){ 62 // end tag 63 att_db[att_db_size] = 0; 64 att_db[att_db_size+1] = 0; 65 } 66 67 void att_db_util_init(void){ 68 #ifdef HAVE_MALLOC 69 att_db = (uint8_t*) malloc(128); 70 att_db_max_size = 128; 71 #else 72 att_db = att_db_storage; 73 att_db_max_size = sizeof(att_db_storage); 74 #endif 75 att_db_size = 0; 76 att_db_next_handle = 1; 77 att_db_util_set_end_tag(); 78 } 79 80 /** 81 * asserts that the requested amount of bytes can be stored in the att_db 82 * @returns TRUE if space is available 83 */ 84 static int att_db_util_assert_space(uint16_t size){ 85 size += 2; // for end tag 86 if (att_db_size + size <= att_db_max_size) return 1; 87 #ifdef HAVE_MALLOC 88 int new_size = att_db_size + att_db_size / 2; 89 att_db = (uint8_t*) realloc(att_db, new_size); 90 if (!att_db) { 91 log_error("att_db: realloc failed"); 92 return 0; 93 } 94 att_db_max_size = new_size; 95 return 1; 96 #else 97 log_error("att_db: out of memory"); 98 return 0; 99 #endif 100 } 101 102 // attribute size in bytes (16), flags(16), handle (16), uuid (16/128), value(...) 103 104 // db endds with 0x00 0x00 105 106 static void att_db_util_add_attribute_uuid16(uint16_t uuid16, uint16_t flags, uint8_t * data, uint16_t data_len){ 107 int size = 2 + 2 + 2 + 2 + data_len; 108 if (!att_db_util_assert_space(size)) return; 109 bt_store_16(att_db, att_db_size, size); 110 att_db_size += 2; 111 bt_store_16(att_db, att_db_size, flags); 112 att_db_size += 2; 113 bt_store_16(att_db, att_db_size, att_db_next_handle); 114 att_db_size += 2; 115 att_db_next_handle++; 116 bt_store_16(att_db, att_db_size, uuid16); 117 att_db_size += 2; 118 memcpy(&att_db[att_db_size], data, data_len); 119 att_db_size += data_len; 120 att_db_util_set_end_tag(); 121 } 122 123 static void att_db_util_add_attribute_uuid128(uint8_t * uuid128, uint16_t flags, uint8_t * data, uint16_t data_len){ 124 int size = 2 + 2 + 2 + 16 + data_len; 125 if (!att_db_util_assert_space(size)) return; 126 flags |= ATT_PROPERTY_UUID128; 127 bt_store_16(att_db, att_db_size, size); 128 att_db_size += 2; 129 bt_store_16(att_db, att_db_size, flags); 130 att_db_size += 2; 131 bt_store_16(att_db, att_db_size, att_db_next_handle); 132 att_db_size += 2; 133 att_db_next_handle++; 134 swap128(uuid128, &att_db[att_db_size]); 135 att_db_size += 16; 136 memcpy(&att_db[att_db_size], data, data_len); 137 att_db_size += data_len; 138 att_db_util_set_end_tag(); 139 } 140 141 void att_db_util_add_service_uuid16(uint16_t uuid16){ 142 uint8_t buffer[2]; 143 bt_store_16(buffer, 0, uuid16); 144 att_db_util_add_attribute_uuid16(GATT_PRIMARY_SERVICE_UUID, ATT_PROPERTY_READ, buffer, 2); 145 } 146 147 void att_db_util_add_service_uuid128(uint8_t * uuid128){ 148 uint8_t buffer[16]; 149 swap128(uuid128, buffer); 150 att_db_util_add_attribute_uuid16(GATT_PRIMARY_SERVICE_UUID, ATT_PROPERTY_READ, buffer, 16); 151 } 152 153 uint16_t att_db_util_add_characteristic_uuid16(uint16_t uuid16, uint16_t properties, uint8_t * data, uint16_t data_len){ 154 uint8_t buffer[5]; 155 buffer[0] = properties; 156 bt_store_16(buffer, 1, att_db_next_handle + 1); 157 bt_store_16(buffer, 3, uuid16); 158 att_db_util_add_attribute_uuid16(GATT_CHARACTERISTICS_UUID, ATT_PROPERTY_READ, buffer, sizeof(buffer)); 159 uint16_t value_handle = att_db_next_handle; 160 att_db_util_add_attribute_uuid16(uuid16, properties, data, data_len); 161 if (properties & (ATT_PROPERTY_NOTIFY | ATT_PROPERTY_INDICATE)){ 162 uint16_t flags = ATT_PROPERTY_READ | ATT_PROPERTY_WRITE | ATT_PROPERTY_DYNAMIC; 163 bt_store_16(buffer, 0, 0); 164 att_db_util_add_attribute_uuid16(GATT_CLIENT_CHARACTERISTICS_CONFIGURATION, flags, buffer, 2); 165 } 166 return value_handle; 167 } 168 169 uint16_t att_db_util_add_characteristic_uuid128(uint8_t * uuid128, uint16_t properties, uint8_t * data, uint16_t data_len){ 170 uint8_t buffer[19]; 171 buffer[0] = properties; 172 bt_store_16(buffer, 1, att_db_next_handle + 1); 173 swap128(uuid128, &buffer[3]); 174 att_db_util_add_attribute_uuid16(GATT_CHARACTERISTICS_UUID, ATT_PROPERTY_READ, buffer, sizeof(buffer)); 175 uint16_t value_handle = att_db_next_handle; 176 att_db_util_add_attribute_uuid128(uuid128, properties, data, data_len); 177 if (properties & (ATT_PROPERTY_NOTIFY | ATT_PROPERTY_INDICATE)){ 178 uint16_t flags = ATT_PROPERTY_READ | ATT_PROPERTY_WRITE | ATT_PROPERTY_DYNAMIC; 179 bt_store_16(buffer, 0, 0); 180 att_db_util_add_attribute_uuid16(GATT_CLIENT_CHARACTERISTICS_CONFIGURATION, flags, buffer, 2); 181 } 182 return value_handle; 183 } 184 185 uint8_t * att_db_util_get_address(void){ 186 return att_db; 187 } 188 189 uint16_t att_db_util_get_size(void){ 190 return att_db_size + 2; // end tag 191 } 192