58a98b5bd1
Fix yet another endianess bug in sdpd(8)
318 lines
7.7 KiB
C
318 lines
7.7 KiB
C
/*
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* sar.c
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*
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* Copyright (c) 2004 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: sar.c,v 1.2 2004/01/08 23:46:51 max Exp $
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* $FreeBSD$
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*/
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#include <sys/queue.h>
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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 <assert.h>
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#include <bluetooth.h>
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#include <errno.h>
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#include <sdp.h>
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#include <stdio.h> /* for NULL */
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#include "profile.h"
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#include "provider.h"
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#include "server.h"
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/*
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* Prepare SDP attr/value pair. Check if profile implements the attribute
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* and if so call the attribute value function.
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*
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* uint16 value16 - 3 bytes (attribute)
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* value - N bytes (value)
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*/
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static int32_t
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server_prepare_attr_value_pair(
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provider_p const provider, uint16_t attr,
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uint8_t *buf, uint8_t const * const eob)
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{
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profile_attr_create_p cf = profile_get_attr(provider->profile, attr);
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int32_t len;
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if (cf == NULL)
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return (0); /* no attribute */
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if (buf + 3 > eob)
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return (-1);
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SDP_PUT8(SDP_DATA_UINT16, buf);
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SDP_PUT16(attr, buf);
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len = cf(buf, eob, (uint8_t const *) provider, sizeof(*provider));
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if (len < 0)
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return (-1);
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return (3 + len);
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}
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/*
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* seq16 value16 - 3 bytes
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* attr value - 3+ bytes
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* [ attr value ]
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*/
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int32_t
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server_prepare_attr_list(provider_p const provider,
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uint8_t const *req, uint8_t const * const req_end,
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uint8_t *rsp, uint8_t const * const rsp_end)
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{
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uint8_t *ptr = rsp + 3;
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int32_t type, hi, lo, len;
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if (ptr > rsp_end)
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return (-1);
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while (req < req_end) {
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SDP_GET8(type, req);
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switch (type) {
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case SDP_DATA_UINT16:
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if (req + 2 > req_end)
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return (-1);
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SDP_GET16(lo, req);
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hi = lo;
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break;
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case SDP_DATA_UINT32:
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if (req + 4 > req_end)
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return (-1);
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SDP_GET16(lo, req);
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SDP_GET16(hi, req);
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break;
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default:
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return (-1);
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/* NOT REACHED */
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}
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for (; lo <= hi; lo ++) {
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len = server_prepare_attr_value_pair(provider, lo, ptr, rsp_end);
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if (len < 0)
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return (-1);
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ptr += len;
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}
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}
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len = ptr - rsp; /* we put this much bytes in rsp */
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/* Fix SEQ16 header for the rsp */
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SDP_PUT8(SDP_DATA_SEQ16, rsp);
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SDP_PUT16(len - 3, rsp);
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return (len);
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}
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/*
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* Prepare SDP Service Attribute Response
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*/
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int32_t
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server_prepare_service_attribute_response(server_p srv, int32_t fd)
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{
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uint8_t const *req = srv->req + sizeof(sdp_pdu_t);
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uint8_t const *req_end = req + ((sdp_pdu_p)(srv->req))->len;
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uint8_t *rsp = srv->fdidx[fd].rsp;
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uint8_t const *rsp_end = rsp + NG_L2CAP_MTU_MAXIMUM;
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uint8_t *ptr = NULL;
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provider_t *provider = NULL;
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uint32_t handle;
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int32_t type, rsp_limit, aidlen, cslen, cs;
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/*
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* Minimal Service Attribute Request request
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*
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* value32 - 4 bytes ServiceRecordHandle
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* value16 - 2 bytes MaximumAttributeByteCount
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* seq8 len8 - 2 bytes
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* uint16 value16 - 3 bytes AttributeIDList
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* value8 - 1 byte ContinuationState
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*/
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if (req_end - req < 12)
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return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
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/* Get ServiceRecordHandle and MaximumAttributeByteCount */
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SDP_GET32(handle, req);
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SDP_GET16(rsp_limit, req);
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if (rsp_limit <= 0)
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return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
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/* Get size of AttributeIDList */
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aidlen = 0;
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SDP_GET8(type, req);
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switch (type) {
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case SDP_DATA_SEQ8:
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SDP_GET8(aidlen, req);
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break;
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case SDP_DATA_SEQ16:
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SDP_GET16(aidlen, req);
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break;
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case SDP_DATA_SEQ32:
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SDP_GET32(aidlen, req);
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break;
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}
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if (aidlen <= 0)
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return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
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ptr = (uint8_t *) req + aidlen;
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/* Get ContinuationState */
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if (ptr + 1 > req_end)
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return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
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SDP_GET8(cslen, ptr);
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if (cslen != 0) {
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if (cslen != 2 || req_end - ptr != 2)
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return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);
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SDP_GET16(cs, ptr);
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} else
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cs = 0;
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/* Process the request. First, check continuation state */
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if (srv->fdidx[fd].rsp_cs != cs)
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return (SDP_ERROR_CODE_INVALID_CONTINUATION_STATE);
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if (srv->fdidx[fd].rsp_size > 0)
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return (0);
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/* Lookup record handle */
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if ((provider = provider_by_handle(handle)) == NULL)
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return (SDP_ERROR_CODE_INVALID_SERVICE_RECORD_HANDLE);
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/*
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* Service Attribute Response format
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*
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* value16 - 2 bytes AttributeListByteCount (not incl.)
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* seq8 len16 - 3 bytes
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* attr value - 3+ bytes AttributeList
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* [ attr value ]
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*/
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cs = server_prepare_attr_list(provider, req, req+aidlen, rsp, rsp_end);
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if (cs < 0)
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return (SDP_ERROR_CODE_INSUFFICIENT_RESOURCES);
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/* Set reply size (not counting PDU header and continuation state) */
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srv->fdidx[fd].rsp_limit = srv->fdidx[fd].omtu - sizeof(sdp_pdu_t) - 2;
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if (srv->fdidx[fd].rsp_limit > rsp_limit)
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srv->fdidx[fd].rsp_limit = rsp_limit;
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srv->fdidx[fd].rsp_size = cs;
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srv->fdidx[fd].rsp_cs = 0;
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return (0);
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}
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/*
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* Send SDP Service [Search] Attribute Response
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*/
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int32_t
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server_send_service_attribute_response(server_p srv, int32_t fd)
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{
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uint8_t *rsp = srv->fdidx[fd].rsp + srv->fdidx[fd].rsp_cs;
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uint8_t *rsp_end = srv->fdidx[fd].rsp + srv->fdidx[fd].rsp_size;
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struct iovec iov[4];
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sdp_pdu_t pdu;
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uint16_t bcount;
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uint8_t cs[3];
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int32_t size;
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/* First update continuation state (assume we will send all data) */
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size = rsp_end - rsp;
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srv->fdidx[fd].rsp_cs += size;
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if (size + 1 > srv->fdidx[fd].rsp_limit) {
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/*
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* We need to split out response. Add 3 more bytes for the
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* continuation state and move rsp_end and rsp_cs backwards.
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*/
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while ((rsp_end - rsp) + 3 > srv->fdidx[fd].rsp_limit) {
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rsp_end --;
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srv->fdidx[fd].rsp_cs --;
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}
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cs[0] = 2;
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cs[1] = srv->fdidx[fd].rsp_cs >> 8;
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cs[2] = srv->fdidx[fd].rsp_cs & 0xff;
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} else
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cs[0] = 0;
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assert(rsp_end >= rsp);
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bcount = rsp_end - rsp;
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if (((sdp_pdu_p)(srv->req))->pid == SDP_PDU_SERVICE_ATTRIBUTE_REQUEST)
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pdu.pid = SDP_PDU_SERVICE_ATTRIBUTE_RESPONSE;
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else
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pdu.pid = SDP_PDU_SERVICE_SEARCH_ATTRIBUTE_RESPONSE;
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pdu.tid = ((sdp_pdu_p)(srv->req))->tid;
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pdu.len = htons(sizeof(bcount) + bcount + 1 + cs[0]);
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bcount = htons(bcount);
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iov[0].iov_base = &pdu;
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iov[0].iov_len = sizeof(pdu);
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iov[1].iov_base = &bcount;
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iov[1].iov_len = sizeof(bcount);
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iov[2].iov_base = rsp;
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iov[2].iov_len = rsp_end - rsp;
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iov[3].iov_base = cs;
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iov[3].iov_len = 1 + cs[0];
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do {
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size = writev(fd, (struct iovec const *) &iov, sizeof(iov)/sizeof(iov[0]));
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} while (size < 0 && errno == EINTR);
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/* Check if we have sent (or failed to sent) last response chunk */
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if (srv->fdidx[fd].rsp_cs == srv->fdidx[fd].rsp_size) {
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srv->fdidx[fd].rsp_cs = 0;
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srv->fdidx[fd].rsp_size = 0;
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srv->fdidx[fd].rsp_limit = 0;
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}
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return ((size < 0)? errno : 0);
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}
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