1 /*- 2 * ssr.c 3 * 4 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 5 * 6 * Copyright (c) 2004 Maksim Yevmenkin <m_evmenkin@yahoo.com> 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * $Id: ssr.c,v 1.5 2004/01/13 01:54:39 max Exp $ 31 * $FreeBSD$ 32 */ 33 34 #include <sys/queue.h> 35 #include <sys/uio.h> 36 #include <netinet/in.h> 37 #include <arpa/inet.h> 38 #include <assert.h> 39 #define L2CAP_SOCKET_CHECKED 40 #include <bluetooth.h> 41 #include <errno.h> 42 #include <sdp.h> 43 #include <string.h> 44 #include "profile.h" 45 #include "provider.h" 46 #include "server.h" 47 #include "uuid-private.h" 48 49 /* 50 * Prepare SDP Service Search Response 51 */ 52 53 int32_t 54 server_prepare_service_search_response(server_p srv, int32_t fd) 55 { 56 uint8_t const *req = srv->req + sizeof(sdp_pdu_t); 57 uint8_t const *req_end = req + ((sdp_pdu_p)(srv->req))->len; 58 uint8_t *rsp = srv->fdidx[fd].rsp; 59 uint8_t const *rsp_end = rsp + NG_L2CAP_MTU_MAXIMUM; 60 61 uint8_t *ptr = NULL; 62 provider_t *provider = NULL; 63 int32_t type, ssplen, rsp_limit, rcount, cslen, cs; 64 uint128_t uuid, puuid; 65 66 /* 67 * Minimal SDP Service Search Request 68 * 69 * seq8 len8 - 2 bytes 70 * uuid16 value16 - 3 bytes ServiceSearchPattern 71 * value16 - 2 bytes MaximumServiceRecordCount 72 * value8 - 1 byte ContinuationState 73 */ 74 75 if (req_end - req < 8) 76 return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX); 77 78 /* Get size of ServiceSearchPattern */ 79 ssplen = 0; 80 SDP_GET8(type, req); 81 switch (type) { 82 case SDP_DATA_SEQ8: 83 SDP_GET8(ssplen, req); 84 break; 85 86 case SDP_DATA_SEQ16: 87 SDP_GET16(ssplen, req); 88 break; 89 90 case SDP_DATA_SEQ32: 91 SDP_GET32(ssplen, req); 92 break; 93 } 94 if (ssplen <= 0) 95 return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX); 96 97 ptr = (uint8_t *) req + ssplen; 98 99 /* Get MaximumServiceRecordCount */ 100 if (ptr + 2 > req_end) 101 return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX); 102 103 SDP_GET16(rsp_limit, ptr); 104 if (rsp_limit <= 0) 105 return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX); 106 107 /* Get ContinuationState */ 108 if (ptr + 1 > req_end) 109 return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX); 110 111 SDP_GET8(cslen, ptr); 112 if (cslen != 0) { 113 if (cslen != 2 || req_end - ptr != 2) 114 return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX); 115 116 SDP_GET16(cs, ptr); 117 } else 118 cs = 0; 119 120 /* Process the request. First, check continuation state */ 121 if (srv->fdidx[fd].rsp_cs != cs) 122 return (SDP_ERROR_CODE_INVALID_CONTINUATION_STATE); 123 if (srv->fdidx[fd].rsp_size > 0) 124 return (0); 125 126 /* 127 * Service Search Response format 128 * 129 * value16 - 2 bytes TotalServiceRecordCount (not incl.) 130 * value16 - 2 bytes CurrentServiceRecordCount (not incl.) 131 * value32 - 4 bytes handle 132 * [ value32 ] 133 * 134 * Calculate how many record handles we can fit 135 * in our reply buffer and adjust rlimit. 136 */ 137 138 ptr = rsp; 139 rcount = (rsp_end - ptr) / 4; 140 if (rcount < rsp_limit) 141 rsp_limit = rcount; 142 143 /* Look for the record handles */ 144 for (rcount = 0; ssplen > 0 && rcount < rsp_limit; ) { 145 SDP_GET8(type, req); 146 ssplen --; 147 148 switch (type) { 149 case SDP_DATA_UUID16: 150 if (ssplen < 2) 151 return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX); 152 153 memcpy(&uuid, &uuid_base, sizeof(uuid)); 154 uuid.b[2] = *req ++; 155 uuid.b[3] = *req ++; 156 ssplen -= 2; 157 break; 158 159 case SDP_DATA_UUID32: 160 if (ssplen < 4) 161 return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX); 162 163 memcpy(&uuid, &uuid_base, sizeof(uuid)); 164 uuid.b[0] = *req ++; 165 uuid.b[1] = *req ++; 166 uuid.b[2] = *req ++; 167 uuid.b[3] = *req ++; 168 ssplen -= 4; 169 break; 170 171 case SDP_DATA_UUID128: 172 if (ssplen < 16) 173 return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX); 174 175 memcpy(uuid.b, req, 16); 176 req += 16; 177 ssplen -= 16; 178 break; 179 180 default: 181 return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX); 182 /* NOT REACHED */ 183 } 184 185 for (provider = provider_get_first(); 186 provider != NULL && rcount < rsp_limit; 187 provider = provider_get_next(provider)) { 188 if (!provider_match_bdaddr(provider, &srv->req_sa.l2cap_bdaddr)) 189 continue; 190 191 memcpy(&puuid, &uuid_base, sizeof(puuid)); 192 puuid.b[2] = provider->profile->uuid >> 8; 193 puuid.b[3] = provider->profile->uuid; 194 195 if (memcmp(&uuid, &puuid, sizeof(uuid)) == 0 || 196 memcmp(&uuid, &uuid_public_browse_group, sizeof(uuid)) == 0) { 197 SDP_PUT32(provider->handle, ptr); 198 rcount ++; 199 } 200 } 201 } 202 203 /* Set reply size (not counting PDU header and continuation state) */ 204 srv->fdidx[fd].rsp_limit = srv->fdidx[fd].omtu - sizeof(sdp_pdu_t) - 4; 205 srv->fdidx[fd].rsp_size = ptr - rsp; 206 srv->fdidx[fd].rsp_cs = 0; 207 208 return (0); 209 } 210 211 /* 212 * Send SDP Service Search Response 213 */ 214 215 int32_t 216 server_send_service_search_response(server_p srv, int32_t fd) 217 { 218 uint8_t *rsp = srv->fdidx[fd].rsp + srv->fdidx[fd].rsp_cs; 219 uint8_t *rsp_end = srv->fdidx[fd].rsp + srv->fdidx[fd].rsp_size; 220 221 struct iovec iov[4]; 222 sdp_pdu_t pdu; 223 uint16_t rcounts[2]; 224 uint8_t cs[3]; 225 int32_t size; 226 227 /* First update continuation state (assume we will send all data) */ 228 size = rsp_end - rsp; 229 srv->fdidx[fd].rsp_cs += size; 230 231 if (size + 1 > srv->fdidx[fd].rsp_limit) { 232 /* 233 * We need to split out response. Add 3 more bytes for the 234 * continuation state and move rsp_end and rsp_cs backwards. 235 */ 236 237 while ((rsp_end - rsp) + 3 > srv->fdidx[fd].rsp_limit) { 238 rsp_end -= 4; 239 srv->fdidx[fd].rsp_cs -= 4; 240 } 241 242 cs[0] = 2; 243 cs[1] = srv->fdidx[fd].rsp_cs >> 8; 244 cs[2] = srv->fdidx[fd].rsp_cs & 0xff; 245 } else 246 cs[0] = 0; 247 248 assert(rsp_end >= rsp); 249 250 rcounts[0] = srv->fdidx[fd].rsp_size / 4; /* TotalServiceRecordCount */ 251 rcounts[1] = (rsp_end - rsp) / 4; /* CurrentServiceRecordCount */ 252 253 pdu.pid = SDP_PDU_SERVICE_SEARCH_RESPONSE; 254 pdu.tid = ((sdp_pdu_p)(srv->req))->tid; 255 pdu.len = htons(sizeof(rcounts) + rcounts[1] * 4 + 1 + cs[0]); 256 257 rcounts[0] = htons(rcounts[0]); 258 rcounts[1] = htons(rcounts[1]); 259 260 iov[0].iov_base = &pdu; 261 iov[0].iov_len = sizeof(pdu); 262 263 iov[1].iov_base = rcounts; 264 iov[1].iov_len = sizeof(rcounts); 265 266 iov[2].iov_base = rsp; 267 iov[2].iov_len = rsp_end - rsp; 268 269 iov[3].iov_base = cs; 270 iov[3].iov_len = 1 + cs[0]; 271 272 do { 273 size = writev(fd, (struct iovec const *) &iov, sizeof(iov)/sizeof(iov[0])); 274 } while (size < 0 && errno == EINTR); 275 276 /* Check if we have sent (or failed to sent) last response chunk */ 277 if (srv->fdidx[fd].rsp_cs == srv->fdidx[fd].rsp_size) { 278 srv->fdidx[fd].rsp_cs = 0; 279 srv->fdidx[fd].rsp_size = 0; 280 srv->fdidx[fd].rsp_limit = 0; 281 } 282 283 return ((size < 0)? errno : 0); 284 } 285 286