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/* $OpenBSD: slattach.c,v 1.16 2009/10/27 23:59:34 deraadt Exp $ */
/* $NetBSD: slattach.c,v 1.17 1996/05/19 21:57:39 jonathan Exp $ */
/*
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Adams.
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <netinet/in.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <termios.h>
#include <unistd.h>
int speed = 9600;
int slipdisc = SLIPDISC;
char devicename[32];
static char pidfilename[MAXPATHLEN]; /* name of pid file */
static pid_t pid; /* Our pid */
static FILE *pidfile;
void usage(void);
int ttydisc(char *);
void handler(int);
volatile sig_atomic_t dying;
int
main(int argc, char *argv[])
{
int fd;
char *dev;
struct termios tty;
tcflag_t cflag = HUPCL;
int ch;
sigset_t sigset;
int i;
while ((ch = getopt(argc, argv, "hms:r:t:")) != -1) {
switch (ch) {
case 'h':
cflag |= CRTSCTS;
break;
case 'm':
cflag &= ~HUPCL;
break;
case 's':
speed = atoi(optarg);
break;
case 'r': case 't':
slipdisc = ttydisc(optarg);
break;
case '?':
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc != 1)
usage();
dev = *argv;
if (strncmp(_PATH_DEV, dev, sizeof(_PATH_DEV) - 1)) {
(void)snprintf(devicename, sizeof(devicename),
"%s%s", _PATH_DEV, dev);
dev = devicename;
}
if ((fd = open(dev, O_RDWR | O_NDELAY)) < 0)
err(1, "open: %s", dev);
tty.c_cflag = CREAD | CS8 | cflag;
tty.c_iflag = 0;
tty.c_lflag = 0;
tty.c_oflag = 0;
tty.c_cc[VMIN] = 1;
tty.c_cc[VTIME] = 0;
cfsetspeed(&tty, speed);
if (tcsetattr(fd, TCSADRAIN, &tty) < 0)
err(1, "tcsetattr");
if (ioctl(fd, TIOCSDTR, 0) < 0)
err(1, "TIOCSDTR");
if (ioctl(fd, TIOCSETD, &slipdisc) < 0)
err(1, "TIOCSETD");
if (fork() > 0)
return (0);
/* set up a signal handler to delete the PID file. */
signal(SIGHUP, handler);
signal(SIGTERM, handler);
/* write PID to a file */
pid = getpid();
for(i = strlen(dev); (dev[i] != '/') && i > 0; i--)
;
if(dev[i] == '/')
i++;
(void) snprintf(pidfilename, sizeof pidfilename,
"%sslip.%s.pid", _PATH_VARRUN, dev + i);
truncate(pidfilename, 0); /* If this fails, so will the next one... */
if ((pidfile = fopen(pidfilename, "w")) != NULL) {
fprintf(pidfile, "%ld\n", (long)pid);
(void) fclose(pidfile);
} else {
syslog(LOG_ERR, "Failed to create pid file %s: %m", pidfilename);
pidfilename[0] = 0;
}
sigemptyset(&sigset);
for (;;) {
sigsuspend(&sigset);
if (dying) {
/* delete the pid file. */
if (pidfilename[0] != 0) {
if (unlink(pidfilename) < 0 && errno != ENOENT)
syslog(LOG_WARNING,
"unable to delete pid file: %m");
}
/* terminate gracefully */
return (0);
}
}
}
void
handler(int useless)
{
dying = 1;
}
int
ttydisc(char *name)
{
if (strcmp(name, "slip") == 0)
return(SLIPDISC);
#ifdef STRIPDISC
else if (strcmp(name, "strip") == 0)
return(STRIPDISC);
#endif
else
usage();
}
void
usage(void)
{
fprintf(stderr,
"usage: slattach [-t ldisc] [-hm] [-s baudrate] ttyname\n");
exit(1);
}
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