FreeBSD-5.3/usr.sbin/bluetooth/sdpd/sar.c
/*
* sar.c
*
* 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: sar.c,v 1.2 2004/01/08 23:46:51 max Exp $
* $FreeBSD: src/usr.sbin/bluetooth/sdpd/sar.c,v 1.2 2004/02/26 20:44:55 emax Exp $
*/
#include <sys/queue.h>
#include <sys/uio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <assert.h>
#include <bluetooth.h>
#include <errno.h>
#include <sdp.h>
#include <stdio.h> /* for NULL */
#include "profile.h"
#include "provider.h"
#include "server.h"
/*
* Prepare SDP attr/value pair. Check if profile implements the attribute
* and if so call the attribute value function.
*
* uint16 value16 - 3 bytes (attribute)
* value - N bytes (value)
*/
static int32_t
server_prepare_attr_value_pair(
provider_p const provider, uint16_t attr,
uint8_t *buf, uint8_t const * const eob)
{
profile_attr_create_p cf = profile_get_attr(provider->profile, attr);
int32_t len;
if (cf == NULL)
return (0); /* no attribute */
if (buf + 3 > eob)
return (-1);
SDP_PUT8(SDP_DATA_UINT16, buf);
SDP_PUT16(attr, buf);
len = cf(buf, eob, (uint8_t const *) provider, sizeof(*provider));
if (len < 0)
return (-1);
return (3 + len);
}
/*
* seq16 value16 - 3 bytes
* attr value - 3+ bytes
* [ attr value ]
*/
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)
{
uint8_t *ptr = rsp + 3;
int32_t type, hi, lo, len;
if (ptr > rsp_end)
return (-1);
while (req < req_end) {
SDP_GET8(type, req);
switch (type) {
case SDP_DATA_UINT16:
if (req + 2 > req_end)
return (-1);
SDP_GET16(lo, req);
hi = lo;
break;
case SDP_DATA_UINT32:
if (req + 4 > req_end)
return (-1);
SDP_GET16(lo, req);
SDP_GET16(hi, req);
break;
default:
return (-1);
/* NOT REACHED */
}
for (; lo <= hi; lo ++) {
len = server_prepare_attr_value_pair(provider, lo, ptr, rsp_end);
if (len < 0)
return (-1);
ptr += len;
}
}
len = ptr - rsp; /* we put this much bytes in rsp */
/* Fix SEQ16 header for the rsp */
SDP_PUT8(SDP_DATA_SEQ16, rsp);
SDP_PUT16(len - 3, rsp);
return (len);
}
/*
* Prepare SDP Service Attribute Response
*/
int32_t
server_prepare_service_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 *ptr = NULL;
provider_t *provider = NULL;
uint32_t handle;
int32_t type, rsp_limit, aidlen, cslen, cs;
/*
* Minimal Service Attribute Request request
*
* value32 - 4 bytes ServiceRecordHandle
* value16 - 2 bytes MaximumAttributeByteCount
* seq8 len8 - 2 bytes
* uint16 value16 - 3 bytes AttributeIDList
* value8 - 1 byte ContinuationState
*/
if (req_end - req < 12)
return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
/* Get ServiceRecordHandle and MaximumAttributeByteCount */
SDP_GET32(handle, req);
SDP_GET16(rsp_limit, req);
if (rsp_limit <= 0)
return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
/* Get size of AttributeIDList */
aidlen = 0;
SDP_GET8(type, req);
switch (type) {
case SDP_DATA_SEQ8:
SDP_GET8(aidlen, req);
break;
case SDP_DATA_SEQ16:
SDP_GET16(aidlen, req);
break;
case SDP_DATA_SEQ32:
SDP_GET32(aidlen, req);
break;
}
if (aidlen <= 0)
return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
ptr = (uint8_t *) req + aidlen;
/* Get ContinuationState */
if (ptr + 1 > req_end)
return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
SDP_GET8(cslen, ptr);
if (cslen != 0) {
if (cslen != 2 || req_end - ptr != 2)
return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
SDP_GET16(cs, ptr);
} 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);
/* Lookup record handle */
if ((provider = provider_by_handle(handle)) == NULL)
return (SDP_ERROR_CODE_INVALID_SERVICE_RECORD_HANDLE);
/*
* Service Attribute Response format
*
* value16 - 2 bytes AttributeListByteCount (not incl.)
* seq8 len16 - 3 bytes
* attr value - 3+ bytes AttributeList
* [ attr value ]
*/
cs = server_prepare_attr_list(provider, req, req+aidlen, rsp, rsp_end);
if (cs < 0)
return (SDP_ERROR_CODE_INSUFFICIENT_RESOURCES);
/* 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 = cs;
srv->fdidx[fd].rsp_cs = 0;
return (0);
}
/*
* Send SDP Service [Search] Attribute Response
*/
int32_t
server_send_service_attribute_response(server_p srv, int32_t fd)
{
uint8_t *rsp = srv->fdidx[fd].rsp + srv->fdidx[fd].rsp_cs;
uint8_t *rsp_end = srv->fdidx[fd].rsp + srv->fdidx[fd].rsp_size;
struct iovec iov[4];
sdp_pdu_t pdu;
uint16_t bcount;
uint8_t cs[3];
int32_t size;
/* First update continuation state (assume we will send all data) */
size = rsp_end - rsp;
srv->fdidx[fd].rsp_cs += size;
if (size + 1 > srv->fdidx[fd].rsp_limit) {
/*
* We need to split out response. Add 3 more bytes for the
* continuation state and move rsp_end and rsp_cs backwards.
*/
while ((rsp_end - rsp) + 3 > srv->fdidx[fd].rsp_limit) {
rsp_end --;
srv->fdidx[fd].rsp_cs --;
}
cs[0] = 2;
cs[1] = srv->fdidx[fd].rsp_cs >> 8;
cs[2] = srv->fdidx[fd].rsp_cs & 0xff;
} else
cs[0] = 0;
assert(rsp_end >= rsp);
bcount = rsp_end - rsp;
if (((sdp_pdu_p)(srv->req))->pid == SDP_PDU_SERVICE_ATTRIBUTE_REQUEST)
pdu.pid = SDP_PDU_SERVICE_ATTRIBUTE_RESPONSE;
else
pdu.pid = SDP_PDU_SERVICE_SEARCH_ATTRIBUTE_RESPONSE;
pdu.tid = ((sdp_pdu_p)(srv->req))->tid;
pdu.len = htons(sizeof(bcount) + bcount + 1 + cs[0]);
bcount = htons(bcount);
iov[0].iov_base = &pdu;
iov[0].iov_len = sizeof(pdu);
iov[1].iov_base = &bcount;
iov[1].iov_len = sizeof(bcount);
iov[2].iov_base = rsp;
iov[2].iov_len = rsp_end - rsp;
iov[3].iov_base = cs;
iov[3].iov_len = 1 + cs[0];
do {
size = writev(fd, (struct iovec const *) &iov, sizeof(iov)/sizeof(iov[0]));
} while (size < 0 && errno == EINTR);
/* Check if we have sent (or failed to sent) last response chunk */
if (srv->fdidx[fd].rsp_cs == srv->fdidx[fd].rsp_size) {
srv->fdidx[fd].rsp_cs = 0;
srv->fdidx[fd].rsp_size = 0;
srv->fdidx[fd].rsp_limit = 0;
}
return ((size < 0)? errno : 0);
}