1 /* 2 * search.c 3 * 4 * Copyright (c) 2001-2003 Maksim Yevmenkin <m_evmenkin@yahoo.com> 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 AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $Id: search.c,v 1.2 2003/09/04 22:12:13 max Exp $ 29 * $FreeBSD$ 30 */ 31 32 #include <sys/uio.h> 33 #include <netinet/in.h> 34 #include <arpa/inet.h> 35 #define L2CAP_SOCKET_CHECKED 36 #include <bluetooth.h> 37 #include <errno.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <unistd.h> 42 43 #include <sdp-int.h> 44 #include <sdp.h> 45 46 int32_t 47 sdp_search(void *xss, 48 uint32_t plen, uint16_t const *pp, 49 uint32_t alen, uint32_t const *ap, 50 uint32_t vlen, sdp_attr_t *vp) 51 { 52 struct sdp_xpdu { 53 sdp_pdu_t pdu; 54 uint16_t len; 55 } __attribute__ ((packed)) xpdu; 56 57 sdp_session_p ss = (sdp_session_p) xss; 58 uint8_t *req = NULL, *rsp = NULL, *rsp_tmp = NULL; 59 int32_t t, len; 60 uint16_t lo, hi; 61 62 if (ss == NULL) 63 return (-1); 64 65 if (ss->req == NULL || ss->rsp == NULL || 66 plen == 0 || pp == NULL || alen == 0 || ap == NULL) { 67 ss->error = EINVAL; 68 return (-1); 69 } 70 71 req = ss->req; 72 73 /* Calculate ServiceSearchPattern length */ 74 plen = plen * (sizeof(pp[0]) + 1); 75 76 /* Calculate AttributeIDList length */ 77 for (len = 0, t = 0; t < alen; t ++) { 78 lo = (uint16_t) (ap[t] >> 16); 79 hi = (uint16_t) (ap[t]); 80 81 if (lo > hi) { 82 ss->error = EINVAL; 83 return (-1); 84 } 85 86 if (lo != hi) 87 len += (sizeof(ap[t]) + 1); 88 else 89 len += (sizeof(lo) + 1); 90 } 91 alen = len; 92 93 /* Calculate length of the request */ 94 len = plen + sizeof(uint8_t) + sizeof(uint16_t) + 95 /* ServiceSearchPattern */ 96 sizeof(uint16_t) + 97 /* MaximumAttributeByteCount */ 98 alen + sizeof(uint8_t) + sizeof(uint16_t); 99 /* AttributeIDList */ 100 101 if (ss->req_e - req < len) { 102 ss->error = ENOBUFS; 103 return (-1); 104 } 105 106 /* Put ServiceSearchPattern */ 107 SDP_PUT8(SDP_DATA_SEQ16, req); 108 SDP_PUT16(plen, req); 109 for (; plen > 0; pp ++, plen -= (sizeof(pp[0]) + 1)) { 110 SDP_PUT8(SDP_DATA_UUID16, req); 111 SDP_PUT16(*pp, req); 112 } 113 114 /* Put MaximumAttributeByteCount */ 115 SDP_PUT16(0xffff, req); 116 117 /* Put AttributeIDList */ 118 SDP_PUT8(SDP_DATA_SEQ16, req); 119 SDP_PUT16(alen, req); 120 for (; alen > 0; ap ++) { 121 lo = (uint16_t) (*ap >> 16); 122 hi = (uint16_t) (*ap); 123 124 if (lo != hi) { 125 /* Put attribute range */ 126 SDP_PUT8(SDP_DATA_UINT32, req); 127 SDP_PUT32(*ap, req); 128 alen -= (sizeof(ap[0]) + 1); 129 } else { 130 /* Put attribute */ 131 SDP_PUT8(SDP_DATA_UINT16, req); 132 SDP_PUT16(lo, req); 133 alen -= (sizeof(lo) + 1); 134 } 135 } 136 137 /* Submit ServiceSearchAttributeRequest and wait for response */ 138 ss->cslen = 0; 139 rsp = ss->rsp; 140 141 do { 142 struct iovec iov[2]; 143 uint8_t *req_cs = req; 144 145 /* Add continuation state (if any) */ 146 if (ss->req_e - req_cs < ss->cslen + 1) { 147 ss->error = ENOBUFS; 148 return (-1); 149 } 150 151 SDP_PUT8(ss->cslen, req_cs); 152 if (ss->cslen > 0) { 153 memcpy(req_cs, ss->cs, ss->cslen); 154 req_cs += ss->cslen; 155 } 156 157 /* Prepare SDP PDU header */ 158 xpdu.pdu.pid = SDP_PDU_SERVICE_SEARCH_ATTRIBUTE_REQUEST; 159 xpdu.pdu.tid = htons(ss->tid); 160 xpdu.pdu.len = htons(req_cs - ss->req); 161 162 /* Submit request */ 163 iov[0].iov_base = (void *) &xpdu; 164 iov[0].iov_len = sizeof(xpdu.pdu); 165 iov[1].iov_base = (void *) ss->req; 166 iov[1].iov_len = req_cs - ss->req; 167 168 do { 169 len = writev(ss->s, iov, sizeof(iov)/sizeof(iov[0])); 170 } while (len < 0 && errno == EINTR); 171 172 if (len < 0) { 173 ss->error = errno; 174 return (-1); 175 } 176 177 /* Read response */ 178 iov[0].iov_base = (void *) &xpdu; 179 iov[0].iov_len = sizeof(xpdu); 180 iov[1].iov_base = (void *) rsp; 181 iov[1].iov_len = ss->imtu; 182 183 do { 184 len = readv(ss->s, iov, sizeof(iov)/sizeof(iov[0])); 185 } while (len < 0 && errno == EINTR); 186 187 if (len < 0) { 188 ss->error = errno; 189 return (-1); 190 } 191 if (len < sizeof(xpdu)) { 192 ss->error = ENOMSG; 193 return (-1); 194 } 195 196 xpdu.pdu.tid = ntohs(xpdu.pdu.tid); 197 xpdu.pdu.len = ntohs(xpdu.pdu.len); 198 xpdu.len = ntohs(xpdu.len); 199 200 if (xpdu.pdu.pid == SDP_PDU_ERROR_RESPONSE || 201 xpdu.pdu.tid != ss->tid || 202 xpdu.pdu.len > len || 203 xpdu.len > xpdu.pdu.len) { 204 ss->error = EIO; 205 return (-1); 206 } 207 208 rsp += xpdu.len; 209 ss->tid ++; 210 211 /* Save continuation state (if any) */ 212 ss->cslen = rsp[0]; 213 if (ss->cslen > 0) { 214 if (ss->cslen > sizeof(ss->cs)) { 215 ss->error = ENOBUFS; 216 return (-1); 217 } 218 219 memcpy(ss->cs, rsp + 1, ss->cslen); 220 221 /* 222 * Ensure that we always have ss->imtu bytes 223 * available in the ss->rsp buffer 224 */ 225 226 if (ss->rsp_e - rsp <= ss->imtu) { 227 uint32_t size, offset; 228 229 size = ss->rsp_e - ss->rsp + ss->imtu; 230 offset = rsp - ss->rsp; 231 232 rsp_tmp = realloc(ss->rsp, size); 233 if (rsp_tmp == NULL) { 234 ss->error = ENOMEM; 235 return (-1); 236 } 237 238 ss->rsp = rsp_tmp; 239 ss->rsp_e = ss->rsp + size; 240 rsp = ss->rsp + offset; 241 } 242 } 243 } while (ss->cslen > 0); 244 245 /* 246 * If we got here then we have completed SDP transaction and now 247 * we must populate attribute values into vp array. At this point 248 * ss->rsp points to the beginning of the response and rsp points 249 * to the end of the response. 250 * 251 * From Bluetooth v1.1 spec page 364 252 * 253 * The AttributeLists is a data element sequence where each element 254 * in turn is a data element sequence representing an attribute list. 255 * Each attribute list contains attribute IDs and attribute values 256 * from one service record. The first element in each attribute list 257 * contains the attribute ID of the first attribute to be returned for 258 * that service record. The second element in each attribute list 259 * contains the corresponding attribute value. Successive pairs of 260 * elements in each attribute list contain additional attribute ID 261 * and value pairs. Only attributes that have non-null values within 262 * the service record and whose attribute IDs were specified in the 263 * SDP_ServiceSearchAttributeRequest are contained in the AttributeLists 264 * Neither an attribute ID nor attribute value is placed in 265 * AttributeLists for attributes in the service record that have no 266 * value. Within each attribute list, the attributes are listed in 267 * ascending order of attribute ID value. 268 */ 269 270 if (vp == NULL) 271 goto done; 272 273 rsp_tmp = ss->rsp; 274 275 /* Skip the first SEQ */ 276 SDP_GET8(t, rsp_tmp); 277 switch (t) { 278 case SDP_DATA_SEQ8: 279 SDP_GET8(len, rsp_tmp); 280 break; 281 282 case SDP_DATA_SEQ16: 283 SDP_GET16(len, rsp_tmp); 284 break; 285 286 case SDP_DATA_SEQ32: 287 SDP_GET32(len, rsp_tmp); 288 break; 289 290 default: 291 ss->error = ENOATTR; 292 return (-1); 293 /* NOT REACHED */ 294 } 295 296 for (; rsp_tmp < rsp && vlen > 0; ) { 297 /* Get set of attributes for the next record */ 298 SDP_GET8(t, rsp_tmp); 299 switch (t) { 300 case SDP_DATA_SEQ8: 301 SDP_GET8(len, rsp_tmp); 302 break; 303 304 case SDP_DATA_SEQ16: 305 SDP_GET16(len, rsp_tmp); 306 break; 307 308 case SDP_DATA_SEQ32: 309 SDP_GET32(len, rsp_tmp); 310 break; 311 312 default: 313 ss->error = ENOATTR; 314 return (-1); 315 /* NOT REACHED */ 316 } 317 318 /* Now rsp_tmp points to list of (attr,value) pairs */ 319 for (; len > 0 && vlen > 0; vp ++, vlen --) { 320 /* Attribute */ 321 SDP_GET8(t, rsp_tmp); 322 if (t != SDP_DATA_UINT16) { 323 ss->error = ENOATTR; 324 return (-1); 325 } 326 SDP_GET16(vp->attr, rsp_tmp); 327 328 /* Attribute value */ 329 switch (rsp_tmp[0]) { 330 case SDP_DATA_NIL: 331 alen = 0; 332 break; 333 334 case SDP_DATA_UINT8: 335 case SDP_DATA_INT8: 336 case SDP_DATA_BOOL: 337 alen = sizeof(uint8_t); 338 break; 339 340 case SDP_DATA_UINT16: 341 case SDP_DATA_INT16: 342 case SDP_DATA_UUID16: 343 alen = sizeof(uint16_t); 344 break; 345 346 case SDP_DATA_UINT32: 347 case SDP_DATA_INT32: 348 case SDP_DATA_UUID32: 349 alen = sizeof(uint32_t); 350 break; 351 352 case SDP_DATA_UINT64: 353 case SDP_DATA_INT64: 354 alen = sizeof(uint64_t); 355 break; 356 357 case SDP_DATA_UINT128: 358 case SDP_DATA_INT128: 359 case SDP_DATA_UUID128: 360 alen = sizeof(uint128_t); 361 break; 362 363 case SDP_DATA_STR8: 364 case SDP_DATA_URL8: 365 case SDP_DATA_SEQ8: 366 case SDP_DATA_ALT8: 367 alen = rsp_tmp[1] + sizeof(uint8_t); 368 break; 369 370 case SDP_DATA_STR16: 371 case SDP_DATA_URL16: 372 case SDP_DATA_SEQ16: 373 case SDP_DATA_ALT16: 374 alen = ((uint16_t)rsp_tmp[1] << 8) 375 | ((uint16_t)rsp_tmp[2]); 376 alen += sizeof(uint16_t); 377 break; 378 379 case SDP_DATA_STR32: 380 case SDP_DATA_URL32: 381 case SDP_DATA_SEQ32: 382 case SDP_DATA_ALT32: 383 alen = ((uint32_t)rsp_tmp[1] << 24) 384 | ((uint32_t)rsp_tmp[2] << 16) 385 | ((uint32_t)rsp_tmp[3] << 8) 386 | ((uint32_t)rsp_tmp[4]); 387 alen += sizeof(uint32_t); 388 break; 389 390 default: 391 ss->error = ENOATTR; 392 return (-1); 393 /* NOT REACHED */ 394 } 395 396 alen += sizeof(uint8_t); 397 398 if (vp->value != NULL) { 399 if (alen <= vp->vlen) { 400 vp->flags = SDP_ATTR_OK; 401 vp->vlen = alen; 402 } else 403 vp->flags = SDP_ATTR_TRUNCATED; 404 405 memcpy(vp->value, rsp_tmp, vp->vlen); 406 } else 407 vp->flags = SDP_ATTR_INVALID; 408 409 len -= ( 410 sizeof(uint8_t) + sizeof(uint16_t) + 411 alen 412 ); 413 414 rsp_tmp += alen; 415 } 416 } 417 done: 418 ss->error = 0; 419 420 return (0); 421 } 422 423