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