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freebsd-dev/usr.sbin/bluetooth/sdpd/ssar.c
Hans Petter Selasky 2d3a84f5b0 Improve Bluetooth device discovery support for Android and Microsoft devices. 
Tested using the virtual_bt_speaker(8) tool from the virtual_oss(8)
project at github.com.

PR:			210089
MFC after:		1 week
Sponsored by:		Mellanox Technologies
2019-02-08 13:10:45 +00:00

382 lines
11 KiB
C
Raw Blame History

/*-
* ssar.c
*
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2004 Maksim Yevmenkin <m_evmenkin@yahoo.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: ssar.c,v 1.4 2004/01/12 22:54:31 max Exp $
* $FreeBSD$
*/
#include <sys/queue.h>
#define L2CAP_SOCKET_CHECKED
#include <bluetooth.h>
#include <sdp.h>
#include <string.h>
#include "profile.h"
#include "provider.h"
#include "server.h"
#include "uuid-private.h"
/* from sar.c */
int32_t server_prepare_attr_list(provider_p const provider,
uint8_t const *req, uint8_t const * const req_end,
uint8_t *rsp, uint8_t const * const rsp_end);
/*
* Scan an attribute for matching UUID.
*/
static int
server_search_uuid_sub(uint8_t *buf, uint8_t const * const eob, const uint128_t *uuid)
{
int128_t duuid;
uint32_t value;
uint8_t type;
while (buf < eob) {
SDP_GET8(type, buf);
switch (type) {
case SDP_DATA_UUID16:
if (buf + 2 > eob)
continue;
SDP_GET16(value, buf);
memcpy(&duuid, &uuid_base, sizeof(duuid));
duuid.b[2] = value >> 8 & 0xff;
duuid.b[3] = value & 0xff;
if (memcmp(&duuid, uuid, sizeof(duuid)) == 0)
return (0);
break;
case SDP_DATA_UUID32:
if (buf + 4 > eob)
continue;
SDP_GET32(value, buf);
memcpy(&duuid, &uuid_base, sizeof(duuid));
duuid.b[0] = value >> 24 & 0xff;
duuid.b[1] = value >> 16 & 0xff;
duuid.b[2] = value >> 8 & 0xff;
duuid.b[3] = value & 0xff;
if (memcmp(&duuid, uuid, sizeof(duuid)) == 0)
return (0);
break;
case SDP_DATA_UUID128:
if (buf + 16 > eob)
continue;
SDP_GET_UUID128(&duuid, buf);
if (memcmp(&duuid, uuid, sizeof(duuid)) == 0)
return (0);
break;
case SDP_DATA_UINT8:
case SDP_DATA_INT8:
case SDP_DATA_SEQ8:
buf++;
break;
case SDP_DATA_UINT16:
case SDP_DATA_INT16:
case SDP_DATA_SEQ16:
buf += 2;
break;
case SDP_DATA_UINT32:
case SDP_DATA_INT32:
case SDP_DATA_SEQ32:
buf += 4;
break;
case SDP_DATA_UINT64:
case SDP_DATA_INT64:
buf += 8;
break;
case SDP_DATA_UINT128:
case SDP_DATA_INT128:
buf += 16;
break;
case SDP_DATA_STR8:
if (buf + 1 > eob)
continue;
SDP_GET8(value, buf);
buf += value;
break;
case SDP_DATA_STR16:
if (buf + 2 > eob)
continue;
SDP_GET16(value, buf);
if (value > (eob - buf))
return (1);
buf += value;
break;
case SDP_DATA_STR32:
if (buf + 4 > eob)
continue;
SDP_GET32(value, buf);
if (value > (eob - buf))
return (1);
buf += value;
break;
case SDP_DATA_BOOL:
buf += 1;
break;
default:
return (1);
}
}
return (1);
}
/*
* Search a provider for matching UUID in its attributes.
*/
static int
server_search_uuid(provider_p const provider, const uint128_t *uuid)
{
uint8_t buffer[256];
const attr_t *attr;
int len;
for (attr = provider->profile->attrs; attr->create != NULL; attr++) {
len = attr->create(buffer, buffer + sizeof(buffer),
(const uint8_t *)provider->profile, sizeof(*provider->profile));
if (len < 0)
continue;
if (server_search_uuid_sub(buffer, buffer + len, uuid) == 0)
return (0);
}
return (1);
}
/*
* Prepare SDP Service Search Attribute Response
*/
int32_t
server_prepare_service_search_attribute_response(server_p srv, int32_t fd)
{
uint8_t const *req = srv->req + sizeof(sdp_pdu_t);
uint8_t const *req_end = req + ((sdp_pdu_p)(srv->req))->len;
uint8_t *rsp = srv->fdidx[fd].rsp;
uint8_t const *rsp_end = rsp + NG_L2CAP_MTU_MAXIMUM;
uint8_t const *sspptr = NULL, *aidptr = NULL;
uint8_t *ptr = NULL;
provider_t *provider = NULL;
int32_t type, rsp_limit, ssplen, aidlen, cslen, cs;
uint128_t uuid, puuid;
/*
* Minimal Service Search Attribute Request request
*
* seq8 len8 - 2 bytes
* uuid16 value16 - 3 bytes ServiceSearchPattern
* value16 - 2 bytes MaximumAttributeByteCount
* seq8 len8 - 2 bytes
* uint16 value16 - 3 bytes AttributeIDList
* value8 - 1 byte ContinuationState
*/
if (req_end - req < 13)
return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
/* Get size of ServiceSearchPattern */
ssplen = 0;
SDP_GET8(type, req);
switch (type) {
case SDP_DATA_SEQ8:
SDP_GET8(ssplen, req);
break;
case SDP_DATA_SEQ16:
SDP_GET16(ssplen, req);
break;
case SDP_DATA_SEQ32:
SDP_GET32(ssplen, req);
break;
}
if (ssplen <= 0)
return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
sspptr = req;
req += ssplen;
/* Get MaximumAttributeByteCount */
if (req + 2 > req_end)
return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
SDP_GET16(rsp_limit, req);
if (rsp_limit <= 0)
return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
/* Get size of AttributeIDList */
if (req + 1 > req_end)
return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
aidlen = 0;
SDP_GET8(type, req);
switch (type) {
case SDP_DATA_SEQ8:
if (req + 1 > req_end)
return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
SDP_GET8(aidlen, req);
break;
case SDP_DATA_SEQ16:
if (req + 2 > req_end)
return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
SDP_GET16(aidlen, req);
break;
case SDP_DATA_SEQ32:
if (req + 4 > req_end)
return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
SDP_GET32(aidlen, req);
break;
}
if (aidlen <= 0)
return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
aidptr = req;
req += aidlen;
/* Get ContinuationState */
if (req + 1 > req_end)
return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
SDP_GET8(cslen, req);
if (cslen != 0) {
if (cslen != 2 || req_end - req != 2)
return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
SDP_GET16(cs, req);
} else
cs = 0;
/* Process the request. First, check continuation state */
if (srv->fdidx[fd].rsp_cs != cs)
return (SDP_ERROR_CODE_INVALID_CONTINUATION_STATE);
if (srv->fdidx[fd].rsp_size > 0)
return (0);
/*
* Service Search Attribute Response format
*
* value16 - 2 bytes AttributeListByteCount (not incl.)
* seq8 len16 - 3 bytes
* attr list - 3+ bytes AttributeLists
* [ attr list ]
*/
ptr = rsp + 3;
while (ssplen > 0) {
SDP_GET8(type, sspptr);
ssplen --;
switch (type) {
case SDP_DATA_UUID16:
if (ssplen < 2)
return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
memcpy(&uuid, &uuid_base, sizeof(uuid));
uuid.b[2] = *sspptr ++;
uuid.b[3] = *sspptr ++;
ssplen -= 2;
break;
case SDP_DATA_UUID32:
if (ssplen < 4)
return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
memcpy(&uuid, &uuid_base, sizeof(uuid));
uuid.b[0] = *sspptr ++;
uuid.b[1] = *sspptr ++;
uuid.b[2] = *sspptr ++;
uuid.b[3] = *sspptr ++;
ssplen -= 4;
break;
case SDP_DATA_UUID128:
if (ssplen < 16)
return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
memcpy(uuid.b, sspptr, 16);
sspptr += 16;
ssplen -= 16;
break;
default:
return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
/* NOT REACHED */
}
for (provider = provider_get_first();
provider != NULL;
provider = provider_get_next(provider)) {
if (!provider_match_bdaddr(provider, &srv->req_sa.l2cap_bdaddr))
continue;
memcpy(&puuid, &uuid_base, sizeof(puuid));
puuid.b[2] = provider->profile->uuid >> 8;
puuid.b[3] = provider->profile->uuid;
if (memcmp(&uuid, &puuid, sizeof(uuid)) != 0 &&
memcmp(&uuid, &uuid_public_browse_group, sizeof(uuid)) != 0 &&
server_search_uuid(provider, &uuid) != 0)
continue;
cs = server_prepare_attr_list(provider,
aidptr, aidptr + aidlen, ptr, rsp_end);
if (cs < 0)
return (SDP_ERROR_CODE_INSUFFICIENT_RESOURCES);
ptr += cs;
}
}
/* Set reply size (not counting PDU header and continuation state) */
srv->fdidx[fd].rsp_limit = srv->fdidx[fd].omtu - sizeof(sdp_pdu_t) - 2;
if (srv->fdidx[fd].rsp_limit > rsp_limit)
srv->fdidx[fd].rsp_limit = rsp_limit;
srv->fdidx[fd].rsp_size = ptr - rsp;
srv->fdidx[fd].rsp_cs = 0;
/* Fix AttributeLists sequence header */
ptr = rsp;
SDP_PUT8(SDP_DATA_SEQ16, ptr);
SDP_PUT16(srv->fdidx[fd].rsp_size - 3, ptr);
return (0);
}
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