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 BLUEKITCHEN 24 * GMBH 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__ "ad_parser.c" 39 40 41 // ***************************************************************************** 42 // 43 // Advertising Data Parser 44 // 45 // ***************************************************************************** 46 47 #include <stdint.h> 48 #include <string.h> 49 50 #include "bluetooth_data_types.h" 51 #include "btstack_util.h" 52 #include "hci.h" 53 #include "hci_cmd.h" 54 55 #include "ad_parser.h" 56 57 void ad_iterator_init(ad_context_t *context, uint8_t ad_len, const uint8_t * ad_data){ 58 context->data = ad_data; 59 context->length = ad_len; 60 context->offset = 0; 61 } 62 63 bool ad_iterator_has_more(const ad_context_t * context){ 64 // assert chunk_len and chunk_type are withing buffer 65 if ((context->offset + 1u) >= context->length) { 66 return false; 67 } 68 69 // assert chunk_len > 0 70 uint8_t chunk_len = context->data[context->offset]; 71 if (chunk_len == 0u){ 72 return false; 73 } 74 75 // assert complete chunk fits into buffer 76 if ((context->offset + 1u + chunk_len) > context->length) { 77 return false; 78 } 79 return true; 80 } 81 82 // pre: ad_iterator_has_more() == 1 83 void ad_iterator_next(ad_context_t * context){ 84 uint8_t chunk_len = context->data[context->offset]; 85 context->offset += 1u + chunk_len; 86 } 87 88 uint8_t ad_iterator_get_data_len(const ad_context_t * context){ 89 return context->data[context->offset] - 1u; 90 } 91 92 uint8_t ad_iterator_get_data_type(const ad_context_t * context){ 93 return context->data[context->offset + 1u]; 94 } 95 96 const uint8_t * ad_iterator_get_data(const ad_context_t * context){ 97 return &context->data[context->offset + 2u]; 98 } 99 100 bool ad_data_contains_uuid16(uint8_t ad_len, const uint8_t * ad_data, uint16_t uuid16){ 101 ad_context_t context; 102 ad_iterator_init(&context, ad_len, ad_data); 103 while ( ad_iterator_has_more(&context) ){ 104 uint8_t data_type = ad_iterator_get_data_type(&context); 105 uint8_t data_len = ad_iterator_get_data_len(&context); 106 const uint8_t * data = ad_iterator_get_data(&context); 107 108 uint8_t i; 109 uint8_t ad_uuid128[16], uuid128_bt[16]; 110 111 switch (data_type){ 112 case BLUETOOTH_DATA_TYPE_INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS: 113 case BLUETOOTH_DATA_TYPE_COMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS: 114 for (i=0u; (i + 2u) <= data_len; i+= 2u){ 115 uint16_t uuid = (uint16_t) little_endian_read_16(data, (int) i); 116 if ( uuid == uuid16 ) { 117 return true; 118 } 119 } 120 break; 121 case BLUETOOTH_DATA_TYPE_INCOMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS: 122 case BLUETOOTH_DATA_TYPE_COMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS: 123 uuid_add_bluetooth_prefix(ad_uuid128, uuid16); 124 reverse_128(ad_uuid128, uuid128_bt); 125 for (i=0u; (i + 16u) <= data_len; i += 16u){ 126 if (memcmp(uuid128_bt, &data[i], 16) == 0){ 127 return true; 128 }; 129 } 130 break; 131 default: 132 break; 133 } 134 ad_iterator_next(&context); 135 } 136 return false; 137 } 138 139 bool ad_data_contains_uuid128(uint8_t ad_len, const uint8_t * ad_data, const uint8_t * uuid128){ 140 ad_context_t context; 141 // input in big endian/network order, bluetooth data in little endian 142 uint8_t uuid128_le[16]; 143 reverse_128(uuid128, uuid128_le); 144 ad_iterator_init(&context, ad_len, ad_data); 145 while ( ad_iterator_has_more(&context) ){ 146 uint8_t data_type = ad_iterator_get_data_type(&context); 147 uint8_t data_len = ad_iterator_get_data_len(&context); 148 const uint8_t * data = ad_iterator_get_data(&context); 149 150 uint8_t i; 151 uint8_t ad_uuid128[16]; 152 153 switch (data_type){ 154 case BLUETOOTH_DATA_TYPE_INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS: 155 case BLUETOOTH_DATA_TYPE_COMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS: 156 for (i = 0u; (i+2u) <= data_len; i += 2u){ 157 uint16_t uuid16 = little_endian_read_16(data, (int) i); 158 uuid_add_bluetooth_prefix(ad_uuid128, uuid16); 159 160 if (memcmp(ad_uuid128, uuid128_le, 16) == 0) { 161 return true; 162 } 163 } 164 165 break; 166 case BLUETOOTH_DATA_TYPE_INCOMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS: 167 case BLUETOOTH_DATA_TYPE_COMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS: 168 for (i = 0u; (i + 16u) <= data_len; i += 16u){ 169 if (memcmp(uuid128_le, &data[i], 16) == 0) { 170 return true; 171 } 172 } 173 break; 174 default: 175 break; 176 } 177 ad_iterator_next(&context); 178 } 179 return false; 180 } 181 182