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 <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 bool ad_iterator_has_more(const ad_context_t * context){ 65 // assert chunk_len and chunk_type are withing buffer 66 if ((context->offset+1) >= context->length) return false; 67 68 // assert chunk_len > 0 69 int chunk_len = context->data[context->offset]; 70 if (chunk_len == 0) return false; 71 72 // assert complete chunk fits into buffer 73 if ((context->offset + 1 + chunk_len) > context->length) return false; 74 75 return true; 76 } 77 78 // pre: ad_iterator_has_more() == 1 79 void ad_iterator_next(ad_context_t * context){ 80 int chunk_len = context->data[context->offset]; 81 context->offset += 1 + chunk_len; 82 } 83 84 uint8_t ad_iterator_get_data_len(const ad_context_t * context){ 85 return context->data[context->offset] - 1; 86 } 87 88 uint8_t ad_iterator_get_data_type(const ad_context_t * context){ 89 return context->data[context->offset + 1]; 90 } 91 92 const uint8_t * ad_iterator_get_data(const ad_context_t * context){ 93 return &context->data[context->offset + 2]; 94 } 95 96 bool ad_data_contains_uuid16(uint8_t ad_len, const uint8_t * ad_data, uint16_t uuid16){ 97 ad_context_t context; 98 ad_iterator_init(&context, ad_len, ad_data); 99 while ( ad_iterator_has_more(&context) ){ 100 uint8_t data_type = ad_iterator_get_data_type(&context); 101 uint8_t data_len = ad_iterator_get_data_len(&context); 102 const uint8_t * data = ad_iterator_get_data(&context); 103 104 int i; 105 uint8_t ad_uuid128[16], uuid128_bt[16]; 106 107 switch (data_type){ 108 case BLUETOOTH_DATA_TYPE_INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS: 109 case BLUETOOTH_DATA_TYPE_COMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS: 110 for (i=0; (i+2) <= data_len; i+=2){ 111 uint16_t uuid = little_endian_read_16(data, i); 112 if ( uuid == uuid16 ) return true; 113 } 114 break; 115 case BLUETOOTH_DATA_TYPE_INCOMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS: 116 case BLUETOOTH_DATA_TYPE_COMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS: 117 uuid_add_bluetooth_prefix(ad_uuid128, uuid16); 118 reverse_128(ad_uuid128, uuid128_bt); 119 for (i=0; (i+16) <= data_len; i+=16){ 120 if (memcmp(uuid128_bt, &data[i], 16) == 0) return true; 121 } 122 break; 123 default: 124 break; 125 } 126 ad_iterator_next(&context); 127 } 128 return false; 129 } 130 131 bool ad_data_contains_uuid128(uint8_t ad_len, const uint8_t * ad_data, const uint8_t * uuid128){ 132 ad_context_t context; 133 // input in big endian/network order, bluetooth data in little endian 134 uint8_t uuid128_le[16]; 135 reverse_128(uuid128, uuid128_le); 136 ad_iterator_init(&context, ad_len, ad_data); 137 while ( ad_iterator_has_more(&context) ){ 138 uint8_t data_type = ad_iterator_get_data_type(&context); 139 uint8_t data_len = ad_iterator_get_data_len(&context); 140 const uint8_t * data = ad_iterator_get_data(&context); 141 142 int i; 143 uint8_t ad_uuid128[16]; 144 145 switch (data_type){ 146 case BLUETOOTH_DATA_TYPE_INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS: 147 case BLUETOOTH_DATA_TYPE_COMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS: 148 for (i=0; (i+2) <= data_len; i+=2){ 149 uint16_t uuid16 = little_endian_read_16(data, i); 150 uuid_add_bluetooth_prefix(ad_uuid128, uuid16); 151 152 if (memcmp(ad_uuid128, uuid128_le, 16) == 0) return true; 153 } 154 155 break; 156 case BLUETOOTH_DATA_TYPE_INCOMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS: 157 case BLUETOOTH_DATA_TYPE_COMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS: 158 for (i=0; (i+16) <= data_len; i+=16){ 159 if (memcmp(uuid128_le, &data[i], 16) == 0) return true; 160 } 161 break; 162 default: 163 break; 164 } 165 ad_iterator_next(&context); 166 } 167 return false; 168 } 169 170