sdp.c revision 256281
1/* $NetBSD: sdp.c,v 1.2 2008/12/06 20:01:14 plunky Exp $ */ 2 3/*- 4 * Copyright (c) 2008 Iain Hibbert 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28/* $FreeBSD: stable/10/usr.sbin/bluetooth/btpand/sdp.c 187938 2009-01-30 22:23:21Z emax $ */ 29 30#include <sys/cdefs.h> 31__RCSID("$NetBSD: sdp.c,v 1.2 2008/12/06 20:01:14 plunky Exp $"); 32 33#include <string.h> 34 35#include "sdp.h" 36 37/* 38 * SDP data stream manipulation routines 39 */ 40 41/* Bluetooth Base UUID */ 42static const uuid_t BASE_UUID = { 43 0x00000000, 44 0x0000, 45 0x1000, 46 0x80, 47 0x00, 48 { 0x00, 0x80, 0x5f, 0x9b, 0x34, 0xfb } 49}; 50 51/* 52 * _sdp_match_uuid16(ptr, limit, uuid) 53 * 54 * examine SDP data stream at ptr for a UUID, and return 55 * true if it matches the supplied short alias bluetooth UUID. 56 * limit is the first address past the end of valid data. 57 */ 58bool 59_sdp_match_uuid16(uint8_t **ptr, uint8_t *limit, uint16_t uuid) 60{ 61 uint8_t *p = *ptr; 62 uuid_t u1, u2; 63 64 memcpy(&u1, &BASE_UUID, sizeof(uuid_t)); 65 u1.time_low = uuid; 66 67 if (!_sdp_get_uuid(&p, limit, &u2) 68 || !uuid_equal(&u1, &u2, NULL)) 69 return false; 70 71 *ptr = p; 72 return true; 73} 74 75/* 76 * _sdp_get_uuid(ptr, limit, uuid) 77 * 78 * examine SDP data stream at ptr for a UUID, and extract 79 * to given storage, advancing ptr. 80 * limit is the first address past the end of valid data. 81 */ 82bool 83_sdp_get_uuid(uint8_t **ptr, uint8_t *limit, uuid_t *uuid) 84{ 85 uint8_t *p = *ptr; 86 87 if (p + 1 > limit) 88 return false; 89 90 switch (*p++) { 91 case SDP_DATA_UUID16: 92 if (p + 2 > limit) 93 return false; 94 95 memcpy(uuid, &BASE_UUID, sizeof(uuid_t)); 96 uuid->time_low = be16dec(p); 97 p += 2; 98 break; 99 100 case SDP_DATA_UUID32: 101 if (p + 4 > limit) 102 return false; 103 104 memcpy(uuid, &BASE_UUID, sizeof(uuid_t)); 105 uuid->time_low = be32dec(p); 106 p += 4; 107 break; 108 109 case SDP_DATA_UUID128: 110 if (p + 16 > limit) 111 return false; 112 113 uuid_dec_be(p, uuid); 114 p += 16; 115 break; 116 117 default: 118 return false; 119 } 120 121 *ptr = p; 122 return true; 123} 124 125/* 126 * _sdp_get_seq(ptr, limit, seq) 127 * 128 * examine SDP data stream at ptr for a sequence. return 129 * seq pointer if found and advance ptr to next object. 130 * limit is the first address past the end of valid data. 131 */ 132bool 133_sdp_get_seq(uint8_t **ptr, uint8_t *limit, uint8_t **seq) 134{ 135 uint8_t *p = *ptr; 136 int32_t l; 137 138 if (p + 1 > limit) 139 return false; 140 141 switch (*p++) { 142 case SDP_DATA_SEQ8: 143 if (p + 1 > limit) 144 return false; 145 146 l = *p; 147 p += 1; 148 break; 149 150 case SDP_DATA_SEQ16: 151 if (p + 2 > limit) 152 return false; 153 154 l = be16dec(p); 155 p += 2; 156 break; 157 158 case SDP_DATA_SEQ32: 159 if (p + 4 > limit) 160 return false; 161 162 l = be32dec(p); 163 p += 4; 164 break; 165 166 default: 167 return false; 168 } 169 if (p + l > limit) 170 return false; 171 172 *seq = p; 173 *ptr = p + l; 174 return true; 175} 176 177/* 178 * _sdp_get_uint16(ptr, limit, value) 179 * 180 * examine SDP data stream at ptr for a uint16_t, and 181 * extract to given storage, advancing ptr. 182 * limit is the first address past the end of valid data. 183 */ 184bool 185_sdp_get_uint16(uint8_t **ptr, uint8_t *limit, uint16_t *value) 186{ 187 uint8_t *p = *ptr; 188 uint16_t v; 189 190 if (p + 1 > limit) 191 return false; 192 193 switch (*p++) { 194 case SDP_DATA_UINT16: 195 if (p + 2 > limit) 196 return false; 197 198 v = be16dec(p); 199 p += 2; 200 break; 201 202 default: 203 return false; 204 } 205 206 *value = v; 207 *ptr = p; 208 return true; 209} 210