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/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
* Copyright (C) 2002-2004 Marcel Holtmann <marcel@holtmann.org>
*
*
* 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.
*
*
* $Id$
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdint.h>
#include <errno.h>
#include <fcntl.h>
#include <syslog.h>
#include <setjmp.h>
#include <string.h>
#include "lib.h"
#define MS_PPP 2
#define MS_SUCCESS 1
#define MS_FAILED -1
#define MS_TIMEOUT -2
static sigjmp_buf jmp;
static int retry;
static int timeout;
static void sig_alarm(int sig)
{
siglongjmp(jmp, MS_TIMEOUT);
}
static int w4_str(int fd, char *str)
{
char buf[40];
int r, len = 0;
while (1) {
r = read(fd, buf + len, sizeof(buf) - len - 1);
if (r < 0) {
if (errno == EINTR || errno == EAGAIN)
continue;
break;
}
if (!r)
break;
len += r;
if (len < strlen(str))
continue;
buf[len] = 0;
if (strstr(buf, str))
return MS_SUCCESS;
/* Detect PPP */
if (strchr(buf, '~'))
return MS_PPP;
}
return MS_FAILED;
}
static int ms_server(int fd)
{
switch (w4_str(fd, "CLIENT")) {
case MS_SUCCESS:
write_n(fd, "CLIENTSERVER", 12);
case MS_PPP:
return MS_SUCCESS;
default:
return MS_FAILED;
}
}
static int ms_client(int fd)
{
write_n(fd, "CLIENT", 6);
return w4_str(fd, "CLIENTSERVER");
}
int ms_dun(int fd, int server, int timeo)
{
sig_t osig;
retry = 4;
timeout = timeo;
if (!server)
timeout /= retry;
osig = signal(SIGALRM, sig_alarm);
while (1) {
int r = sigsetjmp(jmp, 1);
if (r) {
if (r == MS_TIMEOUT && !server && --retry)
continue;
alarm(0);
signal(SIGALRM, osig);
switch (r) {
case MS_SUCCESS:
case MS_PPP:
errno = 0;
return 0;
case MS_FAILED:
errno = EPROTO;
break;
case MS_TIMEOUT:
errno = ETIMEDOUT;
break;
}
return -1;
}
alarm(timeout);
if (server)
r = ms_server(fd);
else
r = ms_client(fd);
siglongjmp(jmp, r);
}
}
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