connect.c

蓝牙的各种编程接口和各种按理介绍,还有一些例子和说明

/*
   Service Discovery Protocol (SDP)
   Copyright (C) 2002 Maxim Krasnyansky <[e-mail]>
   
   Based on original SDP implementation by Nokia Corporation.
   Copyright (C) 2001,2002 Nokia Corporation.
   Original author Guruprasad Krishnamurthy <[e-mail]>
   
   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: connect.c,v 1.27 2003/07/03 09:39:43 jscrane Exp $
 */
#include <unistd.h>
#include <malloc.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdio.h>

#include <bluetooth/bluetooth.h>
#include <bluetooth/l2cap.h>

#include "sdp.h"
#include "sdp_internal.h"
#include "sdp_lib.h"

int sdp_close(sdp_session_t *session)
{
	int ret = close(session->sock);
	free(session);
	return ret;
}

static inline int sdp_is_local(const bdaddr_t *device)
{
	return memcmp(device, BDADDR_LOCAL, sizeof(bdaddr_t)) == 0;
}

sdp_session_t *sdp_connect(const bdaddr_t *src, const bdaddr_t *dst, uint32_t flags)
{
	sdp_session_t *session = malloc(sizeof(sdp_session_t));
	if (!session)
		return session;
	memset(session, 0, sizeof(*session));
	session->flags = flags;
	if (sdp_is_local(dst)) {
		struct sockaddr_un sa;

		// create local unix connection
		session->sock = socket(PF_UNIX, SOCK_STREAM, 0);
		session->local = 1;
		if (session->sock >= 0) {
			sa.sun_family = AF_UNIX;
			strcpy(sa.sun_path, SDP_UNIX_PATH);
			if (connect(session->sock, (struct sockaddr *)&sa, sizeof(sa)) == 0)
				return session;
		}
	} else {
		struct sockaddr_l2 sa;

		// create L2CAP connection
		session->sock = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP);
		session->local = 0;
		if (session->sock >= 0) {
			sa.l2_family = AF_BLUETOOTH;
			sa.l2_psm = 0;
			if (bacmp(src, BDADDR_ANY) != 0) {
				sa.l2_bdaddr = *src;
				if (0 > bind(session->sock, (struct sockaddr *)&sa, sizeof(sa)))
					goto fail;
			}
			sa.l2_psm = htobs(SDP_PSM);
			sa.l2_bdaddr = *dst;
			do
				if (connect(session->sock, (struct sockaddr *)&sa, sizeof(sa)) == 0)
					return session;
			while (errno == EBUSY && (flags & SDP_RETRY_IF_BUSY));
		}
	}
fail:
	if (session->sock >= 0)
		close(session->sock);
	free(session);
	return 0;
}