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 int ad_iterator_has_more(const ad_context_t * context){ 67 return context->offset < context->length; 68 } 69 70 void ad_iterator_next(ad_context_t * context){ 71 int chunk_len = context->data[context->offset]; 72 int new_offset = context->offset + 1 + chunk_len; 73 // avoid uint8_t overrun 74 if (new_offset > 0xff){ 75 new_offset = 0xff; 76 } 77 context->offset = new_offset; 78 } 79 80 uint8_t ad_iterator_get_data_len(const ad_context_t * context){ 81 return context->data[context->offset] - 1; 82 } 83 84 uint8_t ad_iterator_get_data_type(const ad_context_t * context){ 85 return context->data[context->offset + 1]; 86 } 87 88 const uint8_t * ad_iterator_get_data(const ad_context_t * context){ 89 return &context->data[context->offset + 2]; 90 } 91 92 int ad_data_contains_uuid16(uint8_t ad_len, const uint8_t * ad_data, uint16_t uuid16){ 93 ad_context_t context; 94 for (ad_iterator_init(&context, ad_len, ad_data) ; ad_iterator_has_more(&context) ; ad_iterator_next(&context)){ 95 uint8_t data_type = ad_iterator_get_data_type(&context); 96 uint8_t data_len = ad_iterator_get_data_len(&context); 97 const uint8_t * data = ad_iterator_get_data(&context); 98 99 int i; 100 uint8_t ad_uuid128[16], uuid128_bt[16]; 101 102 switch (data_type){ 103 case BLUETOOTH_DATA_TYPE_INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS: 104 case BLUETOOTH_DATA_TYPE_COMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS: 105 for (i=0; i<data_len; i+=2){ 106 uint16_t uuid = little_endian_read_16(data, i); 107 if ( uuid == uuid16 ) return 1; 108 } 109 break; 110 case BLUETOOTH_DATA_TYPE_INCOMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS: 111 case BLUETOOTH_DATA_TYPE_COMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS: 112 uuid_add_bluetooth_prefix(ad_uuid128, uuid16); 113 reverse_128(ad_uuid128, uuid128_bt); 114 115 for (i=0; i<data_len; i+=16){ 116 if (memcmp(uuid128_bt, &data[i], 16) == 0) return 1; 117 } 118 break; 119 default: 120 break; 121 } 122 } 123 return 0; 124 } 125 126 int ad_data_contains_uuid128(uint8_t ad_len, const uint8_t * ad_data, const uint8_t * uuid128){ 127 ad_context_t context; 128 // input in big endian/network order, bluetooth data in little endian 129 uint8_t uuid128_le[16]; 130 reverse_128(uuid128, uuid128_le); 131 for (ad_iterator_init(&context, ad_len, ad_data) ; ad_iterator_has_more(&context) ; ad_iterator_next(&context)){ 132 uint8_t data_type = ad_iterator_get_data_type(&context); 133 uint8_t data_len = ad_iterator_get_data_len(&context); 134 const uint8_t * data = ad_iterator_get_data(&context); 135 136 int i; 137 uint8_t ad_uuid128[16]; 138 139 140 switch (data_type){ 141 case BLUETOOTH_DATA_TYPE_INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS: 142 case BLUETOOTH_DATA_TYPE_COMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS: 143 for (i=0; i<data_len; i+=2){ 144 uint16_t uuid16 = little_endian_read_16(data, i); 145 uuid_add_bluetooth_prefix(ad_uuid128, uuid16); 146 147 if (memcmp(ad_uuid128, uuid128_le, 16) == 0) return 1; 148 } 149 150 break; 151 case BLUETOOTH_DATA_TYPE_INCOMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS: 152 case BLUETOOTH_DATA_TYPE_COMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS: 153 for (i=0; i<data_len; i+=16){ 154 if (memcmp(uuid128_le, &data[i], 16) == 0) return 1; 155 } 156 break; 157 default: 158 break; 159 } 160 } 161 return 0; 162 } 163 164