On Fri, 16 Jun 2006, Maksim Yevmenkin wrote:
> > > sdp(3) client knows *exactly* what the format of the
> > > attributes should be. so, sdp(3) library should provide simple api to
> > > locate
> > > given element of given type in raw data and extract data from it. imo,
> > > more
> > > intelligent parsing could require sdp(3) to actually know about the
> > > profile
> > > client is trying use.
> >
> > Yes was thinking along those lines.. the client would provide a structure
> > detailing how to parse the required attributes where to put the values.
>
> may be. so far i have not seen a need for that.
I looked at the BlueZ implementation and for the sdp query function, they
parse the flat results and return a linked list then have a bunch of extra
functions that extract specific values. See attached file for example in
use to find SPP (ie RFCOMM channel)
It does look neater, but I'm not sure I like the exact concept.
iain
/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2003-2004 Marcel Holtmann <[EMAIL PROTECTED]>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation;
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
* CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
* COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
* SOFTWARE IS DISCLAIMED.
*
*
* $Id: sdp.c,v 1.3 2004/05/02 21:55:36 holtmann Exp $
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <signal.h>
#include <sys/socket.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/sdp.h>
#include <bluetooth/sdp_lib.h>
int sdp_search_hcrp(sdp_session_t *sdp, unsigned short *ctrl_psm, unsigned
short *data_psm)
{
sdp_list_t *srch, *attrs, *rsp;
uuid_t svclass;
uint16_t attr1, attr2;
int err;
if (!sdp)
return -1;
sdp_uuid16_create(&svclass, HCR_PRINT_SVCLASS_ID);
srch = sdp_list_append(NULL, &svclass);
attr1 = SDP_ATTR_PROTO_DESC_LIST;
attrs = sdp_list_append(NULL, &attr1);
attr2 = SDP_ATTR_ADD_PROTO_DESC_LIST;
attrs = sdp_list_append(attrs, &attr2);
err = sdp_service_search_attr_req(sdp, srch, SDP_ATTR_REQ_INDIVIDUAL,
attrs, &rsp);
if (err)
return -1;
for (; rsp; rsp = rsp->next) {
sdp_record_t *rec = (sdp_record_t *) rsp->data;
sdp_list_t *protos;
if (!sdp_get_access_protos(rec, &protos)) {
unsigned short psm = sdp_get_proto_port(protos,
L2CAP_UUID);
if (psm > 0) {
*ctrl_psm = psm;
}
}
if (!sdp_get_add_access_protos(rec, &protos)) {
unsigned short psm = sdp_get_proto_port(protos,
L2CAP_UUID);
if (psm > 0 && *ctrl_psm > 0) {
*data_psm = psm;
return 0;
}
}
}
return -1;
}
int sdp_search_spp(sdp_session_t *sdp, uint8_t *channel)
{
sdp_list_t *srch, *attrs, *rsp;
uuid_t svclass;
uint16_t attr;
int err;
if (!sdp)
return -1;
sdp_uuid16_create(&svclass, SERIAL_PORT_SVCLASS_ID);
srch = sdp_list_append(NULL, &svclass);
attr = SDP_ATTR_PROTO_DESC_LIST;
attrs = sdp_list_append(NULL, &attr);
err = sdp_service_search_attr_req(sdp, srch, SDP_ATTR_REQ_INDIVIDUAL,
attrs, &rsp);
if (err)
return -1;
for (; rsp; rsp = rsp->next) {
sdp_record_t *rec = (sdp_record_t *) rsp->data;
sdp_list_t *protos;
if (!sdp_get_access_protos(rec, &protos)) {
uint8_t ch = sdp_get_proto_port(protos, RFCOMM_UUID);
if (ch > 0) {
*channel = ch;
return 0;
}
}
}
return -1;
}
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