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