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/* $OpenBSD: ldattach.c,v 1.4 2008/01/05 17:33:28 mbalmer Exp $ */
/*
* Copyright (c) 2007, 2008 Marc Balmer <mbalmer@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, 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.
*/
/*
* A replacement for slattach(8) and nmeaattach(8) that can be used from
* the commandline or from init(8) (using entries in /etc/ttys).
*/
#include <sys/ioctl.h>
#include <sys/limits.h>
#include <sys/ttycom.h>
#include <err.h>
#include <errno.h>
#include <fcntl.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>
__dead void usage(void);
void coroner(int);
volatile sig_atomic_t dying = 0;
__dead void
usage(void)
{
extern char *__progname;
fprintf(stderr, "usage: %s [-27dehmo] [-s baudrate] "
"[-t cond] discipline device\n", __progname);
exit(1);
}
int
main(int argc, char *argv[])
{
struct termios tty;
struct tstamps tstamps;
const char *errstr;
sigset_t sigset;
pid_t ppid;
int ch, fd, ldisc, nodaemon = 0;
int bits = 0, parity = 0, stop = 0, flowcl = 0, hupcl = 1;
speed_t speed = 0;
char devn[32], *dev, *disc;
tstamps.ts_set = tstamps.ts_clr = 0;
if ((ppid = getppid()) == 1)
nodaemon = 1;
while ((ch = getopt(argc, argv, "27dehmos:t:")) != -1) {
switch (ch) {
case '2':
stop = 2;
break;
case '7':
bits = 7;
break;
case 'd':
nodaemon = 1;
break;
case 'e':
parity = 'e';
break;
case 'h':
flowcl = 1;
break;
case 'm':
hupcl = 0;
break;
case 'o':
parity = 'o';
break;
case 's':
speed = (speed_t)strtonum(optarg, 0, UINT_MAX, &errstr);
if (errstr) {
if (ppid != 1)
errx(1, "speed is %s: %s", errstr,
optarg);
else
goto bail_out;
}
break;
case 't':
if (!strcasecmp(optarg, "dcd"))
tstamps.ts_set |= TIOCM_CAR;
else if (!strcasecmp(optarg, "!dcd"))
tstamps.ts_clr |= TIOCM_CAR;
else if (!strcasecmp(optarg, "cts"))
tstamps.ts_set |= TIOCM_CTS;
else if (!strcasecmp(optarg, "!cts"))
tstamps.ts_clr |= TIOCM_CTS;
else {
if (ppid != 1)
errx(1, "'%s' not supported for "
"timestamping", optarg);
else
goto bail_out;
}
break;
default:
if (ppid != -1)
usage();
}
}
argc -= optind;
argv += optind;
if (ppid != 1 && argc != 2)
usage();
disc = *argv++;
dev = *argv;
if (strncmp(_PATH_DEV, dev, sizeof(_PATH_DEV) - 1)) {
(void)snprintf(devn, sizeof(devn),
"%s%s", _PATH_DEV, dev);
dev = devn;
}
if (!strcmp(disc, "slip")) {
bits = 8; /* make sure we use 8 databits */
ldisc = SLIPDISC;
} else if (!strcmp(disc, "nmea")) {
ldisc = NMEADISC;
if (speed == 0)
speed = B4800; /* default is 4800 baud for nmea */
} else if (!strcmp(disc, "msts")) {
ldisc = MSTSDISC;
} else {
syslog(LOG_ERR, "unknown line discipline %s", disc);
goto bail_out;
}
syslog(LOG_INFO, "attach %s on %s", disc, dev);
if ((fd = open(dev, O_RDWR)) < 0)
goto bail_out;
/*
* Get the current line attributes, modify only values that are
* either requested on the command line or that are needed by
* the line discipline (e.g. nmea has a default baudrate of
* 4800 instead of 9600).
*/
if (tcgetattr(fd, &tty) < 0) {
if (ppid != 1)
warnx("tcgetattr");
goto bail_out;
}
if (bits == 7) {
tty.c_cflag &= ~CS8;
tty.c_cflag |= CS7;
} else if (bits == 8) {
tty.c_cflag &= ~CS7;
tty.c_cflag |= CS8;
}
if (parity != 0)
tty.c_cflag |= PARENB;
if (parity == 'o')
tty.c_cflag |= PARODD;
else
tty.c_cflag &= ~PARODD;
if (stop == 2)
tty.c_cflag |= CSTOPB;
else
tty.c_cflag &= ~CSTOPB;
if (flowcl)
tty.c_cflag |= CRTSCTS;
if (hupcl == 0)
tty.c_cflag &= ~HUPCL;
if (speed != 0)
cfsetspeed(&tty, speed);
/* setup common to all line disciplines */
if (ioctl(fd, TIOCSDTR, 0) < 0)
warn("TIOCSDTR");
if (ioctl(fd, TIOCSETD, &ldisc) < 0) {
syslog(LOG_ERR, "can't set the %s line discipline on %s", disc,
dev);
goto bail_out;
}
/* line discpline specific setup */
switch (ldisc) {
case NMEADISC:
if (ioctl(fd, TIOCSTSTAMP, &tstamps) < 0) {
warnx("TIOCSTSTAMP");
goto bail_out;
}
break;
case SLIPDISC:
tty.c_iflag = 0;
tty.c_lflag = 0;
tty.c_oflag = 0;
tty.c_cc[VMIN] = 1;
tty.c_cc[VTIME] = 0;
break;
}
/* finally set the line attributes */
if (tcsetattr(fd, TCSADRAIN, &tty) < 0) {
if (ppid != 1)
warnx("tcsetattr");
goto bail_out;
}
if (!nodaemon && daemon(0, 0))
errx(1, "can't daemonize");
signal(SIGHUP, coroner);
signal(SIGTERM, coroner);
sigemptyset(&sigset);
while (!dying)
sigsuspend(&sigset);
bail_out:
if (ppid == 1)
sleep(30); /* delay restart when called from init */
return 0;
}
/* ARGSUSED */
void
coroner(int useless)
{
dying = 1;
}
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