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_util.c" 39 40 #include <stdlib.h> 41 #include <string.h> 42 43 #include "att_db_util.h" 44 #include "ble/att_db.h" 45 #include "ble/core.h" 46 #include "btstack_util.h" 47 #include "btstack_debug.h" 48 #include "bluetooth.h" 49 50 // ATT DB Storage 51 #ifndef HAVE_MALLOC 52 #ifdef MAX_ATT_DB_SIZE 53 static uint8_t att_db_storage[MAX_ATT_DB_SIZE]; 54 #else 55 #error Neither HAVE_MALLOC] nor MAX_ATT_DB_SIZE is defined. 56 #endif 57 #endif 58 59 static uint8_t * att_db; 60 static uint16_t att_db_size; 61 static uint16_t att_db_max_size; 62 static uint16_t att_db_next_handle; 63 64 static void att_db_util_set_end_tag(void){ 65 // end tag 66 att_db[att_db_size] = 0; 67 att_db[att_db_size+1] = 0; 68 } 69 70 void att_db_util_init(void){ 71 #ifdef HAVE_MALLOC 72 att_db = (uint8_t*) malloc(128); 73 att_db_max_size = 128; 74 #else 75 att_db = att_db_storage; 76 att_db_max_size = sizeof(att_db_storage); 77 #endif 78 att_db_size = 0; 79 att_db_next_handle = 1; 80 att_db_util_set_end_tag(); 81 } 82 83 /** 84 * asserts that the requested amount of bytes can be stored in the att_db 85 * @returns TRUE if space is available 86 */ 87 static int att_db_util_assert_space(uint16_t size){ 88 size += 2; // for end tag 89 if (att_db_size + size <= att_db_max_size) return 1; 90 #ifdef HAVE_MALLOC 91 int new_size = att_db_size + att_db_size / 2; 92 uint8_t * new_db = (uint8_t*) realloc(att_db, new_size); 93 if (!new_db) { 94 log_error("att_db: realloc failed"); 95 return 0; 96 } 97 att_db = new_db; 98 att_db_max_size = new_size; 99 return 1; 100 #else 101 log_error("att_db: out of memory"); 102 return 0; 103 #endif 104 } 105 106 // attribute size in bytes (16), flags(16), handle (16), uuid (16/128), value(...) 107 108 // db endds with 0x00 0x00 109 110 static void att_db_util_add_attribute_uuid16(uint16_t uuid16, uint16_t flags, uint8_t * data, uint16_t data_len){ 111 int size = 2 + 2 + 2 + 2 + data_len; 112 if (!att_db_util_assert_space(size)) return; 113 little_endian_store_16(att_db, att_db_size, size); 114 att_db_size += 2; 115 little_endian_store_16(att_db, att_db_size, flags); 116 att_db_size += 2; 117 little_endian_store_16(att_db, att_db_size, att_db_next_handle); 118 att_db_size += 2; 119 att_db_next_handle++; 120 little_endian_store_16(att_db, att_db_size, uuid16); 121 att_db_size += 2; 122 memcpy(&att_db[att_db_size], data, data_len); 123 att_db_size += data_len; 124 att_db_util_set_end_tag(); 125 } 126 127 static void att_db_util_add_attribute_uuid128(uint8_t * uuid128, uint16_t flags, uint8_t * data, uint16_t data_len){ 128 int size = 2 + 2 + 2 + 16 + data_len; 129 if (!att_db_util_assert_space(size)) return; 130 flags |= ATT_PROPERTY_UUID128; 131 little_endian_store_16(att_db, att_db_size, size); 132 att_db_size += 2; 133 little_endian_store_16(att_db, att_db_size, flags); 134 att_db_size += 2; 135 little_endian_store_16(att_db, att_db_size, att_db_next_handle); 136 att_db_size += 2; 137 att_db_next_handle++; 138 reverse_128(uuid128, &att_db[att_db_size]); 139 att_db_size += 16; 140 memcpy(&att_db[att_db_size], data, data_len); 141 att_db_size += data_len; 142 att_db_util_set_end_tag(); 143 } 144 145 void att_db_util_add_service_uuid16(uint16_t uuid16){ 146 uint8_t buffer[2]; 147 little_endian_store_16(buffer, 0, uuid16); 148 att_db_util_add_attribute_uuid16(GATT_PRIMARY_SERVICE_UUID, ATT_PROPERTY_READ, buffer, 2); 149 } 150 151 void att_db_util_add_service_uuid128(uint8_t * uuid128){ 152 uint8_t buffer[16]; 153 reverse_128(uuid128, buffer); 154 att_db_util_add_attribute_uuid16(GATT_PRIMARY_SERVICE_UUID, ATT_PROPERTY_READ, buffer, 16); 155 } 156 157 static void att_db_util_add_client_characteristic_configuration(uint16_t properties){ 158 uint8_t buffer[2]; 159 // keep authentication flags 160 uint16_t flags = (properties & 0x1ff00) | ATT_DB_PERSISTENT_WRITE_CCC | ATT_DB_FLAGS_READ_WITHOUT_AUTHENTICATION | ATT_PROPERTY_READ | ATT_PROPERTY_WRITE | ATT_PROPERTY_DYNAMIC; 161 little_endian_store_16(buffer, 0, 0); 162 att_db_util_add_attribute_uuid16(GATT_CLIENT_CHARACTERISTICS_CONFIGURATION, flags, buffer, 2); 163 } 164 165 uint16_t att_db_util_add_characteristic_uuid16(uint16_t uuid16, uint16_t properties, uint8_t * data, uint16_t data_len){ 166 uint8_t buffer[5]; 167 buffer[0] = properties; 168 little_endian_store_16(buffer, 1, att_db_next_handle + 1); 169 little_endian_store_16(buffer, 3, uuid16); 170 att_db_util_add_attribute_uuid16(GATT_CHARACTERISTICS_UUID, ATT_PROPERTY_READ, buffer, sizeof(buffer)); 171 // drop Broadcast, Notify, Indicate - not used for flags 172 uint16_t value_flags = properties & 0x1ffce; 173 uint16_t value_handle = att_db_next_handle; 174 att_db_util_add_attribute_uuid16(uuid16, value_flags, data, data_len); 175 if (properties & (ATT_PROPERTY_NOTIFY | ATT_PROPERTY_INDICATE)){ 176 att_db_util_add_client_characteristic_configuration(properties); 177 } 178 return value_handle; 179 } 180 181 uint16_t att_db_util_add_characteristic_uuid128(uint8_t * uuid128, uint16_t properties, uint8_t * data, uint16_t data_len){ 182 uint8_t buffer[19]; 183 buffer[0] = properties; 184 little_endian_store_16(buffer, 1, att_db_next_handle + 1); 185 reverse_128(uuid128, &buffer[3]); 186 att_db_util_add_attribute_uuid16(GATT_CHARACTERISTICS_UUID, ATT_PROPERTY_READ, buffer, sizeof(buffer)); 187 // drop Broadcast, Notify, Indicate - not used for flags 188 uint16_t value_flags = properties & 0x1ffce; 189 uint16_t value_handle = att_db_next_handle; 190 att_db_util_add_attribute_uuid128(uuid128, value_flags, data, data_len); 191 if (properties & (ATT_PROPERTY_NOTIFY | ATT_PROPERTY_INDICATE)){ 192 att_db_util_add_client_characteristic_configuration(properties); 193 } 194 return value_handle; 195 } 196 197 uint8_t * att_db_util_get_address(void){ 198 return att_db; 199 } 200 201 uint16_t att_db_util_get_size(void){ 202 return att_db_size + 2; // end tag 203 } 204