422 lines
9.8 KiB
C
422 lines
9.8 KiB
C
/*
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* search.c
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*
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* Copyright (c) 2001-2003 Maksim Yevmenkin <m_evmenkin@yahoo.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: search.c,v 1.2 2003/09/04 22:12:13 max Exp $
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* $FreeBSD$
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*/
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#include <sys/uio.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <bluetooth.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sdp-int.h>
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#include <sdp.h>
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int32_t
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sdp_search(void *xss,
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uint32_t plen, uint16_t const *pp,
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uint32_t alen, uint32_t const *ap,
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uint32_t vlen, sdp_attr_t *vp)
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{
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struct sdp_xpdu {
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sdp_pdu_t pdu;
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uint16_t len;
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} __attribute__ ((packed)) xpdu;
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sdp_session_p ss = (sdp_session_p) xss;
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uint8_t *req = NULL, *rsp = NULL, *rsp_tmp = NULL;
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int32_t t, len;
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uint16_t lo, hi;
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if (ss == NULL)
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return (-1);
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if (ss->req == NULL || ss->rsp == NULL ||
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plen == 0 || pp == NULL || alen == 0 || ap == NULL) {
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ss->error = EINVAL;
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return (-1);
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}
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req = ss->req;
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/* Calculate ServiceSearchPattern length */
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plen = plen * (sizeof(pp[0]) + 1);
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/* Calculate AttributeIDList length */
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for (len = 0, t = 0; t < alen; t ++) {
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lo = (uint16_t) (ap[t] >> 16);
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hi = (uint16_t) (ap[t]);
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if (lo > hi) {
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ss->error = EINVAL;
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return (-1);
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}
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if (lo != hi)
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len += (sizeof(ap[t]) + 1);
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else
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len += (sizeof(lo) + 1);
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}
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alen = len;
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/* Calculate length of the request */
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len = plen + sizeof(uint8_t) + sizeof(uint16_t) +
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/* ServiceSearchPattern */
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sizeof(uint16_t) +
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/* MaximumAttributeByteCount */
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alen + sizeof(uint8_t) + sizeof(uint16_t);
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/* AttributeIDList */
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if (ss->req_e - req < len) {
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ss->error = ENOBUFS;
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return (-1);
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}
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/* Put ServiceSearchPattern */
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SDP_PUT8(SDP_DATA_SEQ16, req);
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SDP_PUT16(plen, req);
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for (; plen > 0; pp ++, plen -= (sizeof(pp[0]) + 1)) {
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SDP_PUT8(SDP_DATA_UUID16, req);
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SDP_PUT16(*pp, req);
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}
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/* Put MaximumAttributeByteCount */
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SDP_PUT16(0xffff, req);
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/* Put AttributeIDList */
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SDP_PUT8(SDP_DATA_SEQ16, req);
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SDP_PUT16(alen, req);
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for (; alen > 0; ap ++) {
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lo = (uint16_t) (*ap >> 16);
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hi = (uint16_t) (*ap);
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if (lo != hi) {
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/* Put attribute range */
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SDP_PUT8(SDP_DATA_UINT32, req);
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SDP_PUT32(*ap, req);
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alen -= (sizeof(ap[0]) + 1);
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} else {
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/* Put attribute */
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SDP_PUT8(SDP_DATA_UINT16, req);
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SDP_PUT16(lo, req);
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alen -= (sizeof(lo) + 1);
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}
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}
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/* Submit ServiceSearchAttributeRequest and wait for response */
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ss->cslen = 0;
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rsp = ss->rsp;
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do {
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struct iovec iov[2];
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uint8_t *req_cs = req;
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/* Add continuation state (if any) */
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if (ss->req_e - req_cs < ss->cslen + 1) {
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ss->error = ENOBUFS;
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return (-1);
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}
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SDP_PUT8(ss->cslen, req_cs);
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if (ss->cslen > 0) {
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memcpy(req_cs, ss->cs, ss->cslen);
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req_cs += ss->cslen;
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}
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/* Prepare SDP PDU header */
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xpdu.pdu.pid = SDP_PDU_SERVICE_SEARCH_ATTRIBUTE_REQUEST;
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xpdu.pdu.tid = htons(ss->tid);
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xpdu.pdu.len = htons(req_cs - ss->req);
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/* Submit request */
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iov[0].iov_base = (void *) &xpdu;
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iov[0].iov_len = sizeof(xpdu.pdu);
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iov[1].iov_base = (void *) ss->req;
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iov[1].iov_len = req_cs - ss->req;
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do {
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len = writev(ss->s, iov, sizeof(iov)/sizeof(iov[0]));
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} while (len < 0 && errno == EINTR);
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if (len < 0) {
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ss->error = errno;
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return (-1);
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}
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/* Read response */
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iov[0].iov_base = (void *) &xpdu;
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iov[0].iov_len = sizeof(xpdu);
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iov[1].iov_base = (void *) rsp;
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iov[1].iov_len = ss->imtu;
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do {
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len = readv(ss->s, iov, sizeof(iov)/sizeof(iov[0]));
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} while (len < 0 && errno == EINTR);
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if (len < 0) {
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ss->error = errno;
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return (-1);
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}
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if (len < sizeof(xpdu)) {
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ss->error = ENOMSG;
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return (-1);
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}
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xpdu.pdu.tid = ntohs(xpdu.pdu.tid);
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xpdu.pdu.len = ntohs(xpdu.pdu.len);
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xpdu.len = ntohs(xpdu.len);
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if (xpdu.pdu.pid == SDP_PDU_ERROR_RESPONSE ||
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xpdu.pdu.tid != ss->tid ||
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xpdu.pdu.len > len ||
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xpdu.len > xpdu.pdu.len) {
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ss->error = EIO;
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return (-1);
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}
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rsp += xpdu.len;
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ss->tid ++;
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/* Save continuation state (if any) */
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ss->cslen = rsp[0];
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if (ss->cslen > 0) {
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if (ss->cslen > sizeof(ss->cs)) {
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ss->error = ENOBUFS;
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return (-1);
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}
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memcpy(ss->cs, rsp + 1, ss->cslen);
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/*
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* Ensure that we always have ss->imtu bytes
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* available in the ss->rsp buffer
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*/
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if (ss->rsp_e - rsp <= ss->imtu) {
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uint32_t size, offset;
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size = ss->rsp_e - ss->rsp + ss->imtu;
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offset = rsp - ss->rsp;
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rsp_tmp = realloc(ss->rsp, size);
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if (rsp_tmp == NULL) {
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ss->error = ENOMEM;
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return (-1);
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}
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ss->rsp = rsp_tmp;
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ss->rsp_e = ss->rsp + size;
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rsp = ss->rsp + offset;
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}
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}
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} while (ss->cslen > 0);
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/*
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* If we got here then we have completed SDP transaction and now
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* we must populate attribute values into vp array. At this point
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* ss->rsp points to the beginning of the response and rsp points
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* to the end of the response.
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*
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* From Bluetooth v1.1 spec page 364
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*
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* The AttributeLists is a data element sequence where each element
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* in turn is a data element sequence representing an attribute list.
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* Each attribute list contains attribute IDs and attribute values
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* from one service record. The first element in each attribute list
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* contains the attribute ID of the first attribute to be returned for
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* that service record. The second element in each attribute list
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* contains the corresponding attribute value. Successive pairs of
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* elements in each attribute list contain additional attribute ID
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* and value pairs. Only attributes that have non-null values within
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* the service record and whose attribute IDs were specified in the
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* SDP_ServiceSearchAttributeRequest are contained in the AttributeLists
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* Neither an attribute ID nor attribute value is placed in
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* AttributeLists for attributes in the service record that have no
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* value. Within each attribute list, the attributes are listed in
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* ascending order of attribute ID value.
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*/
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if (vp == NULL)
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goto done;
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rsp_tmp = ss->rsp;
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/* Skip the first SEQ */
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SDP_GET8(t, rsp_tmp);
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switch (t) {
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case SDP_DATA_SEQ8:
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SDP_GET8(len, rsp_tmp);
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break;
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case SDP_DATA_SEQ16:
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SDP_GET16(len, rsp_tmp);
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break;
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case SDP_DATA_SEQ32:
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SDP_GET32(len, rsp_tmp);
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break;
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default:
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ss->error = ENOATTR;
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return (-1);
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/* NOT REACHED */
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}
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for (; rsp_tmp < rsp && vlen > 0; ) {
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/* Get set of attributes for the next record */
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SDP_GET8(t, rsp_tmp);
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switch (t) {
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case SDP_DATA_SEQ8:
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SDP_GET8(len, rsp_tmp);
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break;
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case SDP_DATA_SEQ16:
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SDP_GET16(len, rsp_tmp);
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break;
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case SDP_DATA_SEQ32:
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SDP_GET32(len, rsp_tmp);
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break;
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default:
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ss->error = ENOATTR;
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return (-1);
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/* NOT REACHED */
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}
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/* Now rsp_tmp points to list of (attr,value) pairs */
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for (; len > 0 && vlen > 0; vp ++, vlen --) {
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/* Attribute */
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SDP_GET8(t, rsp_tmp);
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if (t != SDP_DATA_UINT16) {
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ss->error = ENOATTR;
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return (-1);
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}
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SDP_GET16(vp->attr, rsp_tmp);
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/* Attribute value */
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switch (rsp_tmp[0]) {
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case SDP_DATA_NIL:
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alen = 0;
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break;
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case SDP_DATA_UINT8:
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case SDP_DATA_INT8:
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case SDP_DATA_BOOL:
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alen = sizeof(uint8_t);
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break;
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case SDP_DATA_UINT16:
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case SDP_DATA_INT16:
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case SDP_DATA_UUID16:
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alen = sizeof(uint16_t);
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break;
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case SDP_DATA_UINT32:
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case SDP_DATA_INT32:
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case SDP_DATA_UUID32:
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alen = sizeof(uint32_t);
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break;
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case SDP_DATA_UINT64:
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case SDP_DATA_INT64:
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alen = sizeof(uint64_t);
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break;
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case SDP_DATA_UINT128:
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case SDP_DATA_INT128:
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case SDP_DATA_UUID128:
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alen = sizeof(uint128_t);
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break;
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case SDP_DATA_STR8:
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case SDP_DATA_URL8:
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case SDP_DATA_SEQ8:
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case SDP_DATA_ALT8:
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alen = rsp_tmp[1] + sizeof(uint8_t);
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break;
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case SDP_DATA_STR16:
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case SDP_DATA_URL16:
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case SDP_DATA_SEQ16:
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case SDP_DATA_ALT16:
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alen = ((uint16_t)rsp_tmp[1] << 8)
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| ((uint16_t)rsp_tmp[2]);
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alen += sizeof(uint16_t);
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break;
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case SDP_DATA_STR32:
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case SDP_DATA_URL32:
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case SDP_DATA_SEQ32:
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case SDP_DATA_ALT32:
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alen = ((uint32_t)rsp_tmp[1] << 24)
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| ((uint32_t)rsp_tmp[2] << 16)
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| ((uint32_t)rsp_tmp[3] << 8)
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| ((uint32_t)rsp_tmp[4]);
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alen += sizeof(uint32_t);
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break;
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default:
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ss->error = ENOATTR;
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return (-1);
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/* NOT REACHED */
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}
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alen += sizeof(uint8_t);
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if (vp->value != NULL) {
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if (alen <= vp->vlen) {
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vp->flags = SDP_ATTR_OK;
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vp->vlen = alen;
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} else
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vp->flags = SDP_ATTR_TRUNCATED;
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memcpy(vp->value, rsp_tmp, vp->vlen);
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} else
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vp->flags = SDP_ATTR_INVALID;
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len -= (
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sizeof(uint8_t) + sizeof(uint16_t) +
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alen
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);
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rsp_tmp += alen;
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}
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}
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done:
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ss->error = 0;
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return (0);
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}
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