/* line discipline loading daemon
* open a serial device and attach a line discipline on it
*
* Usage:
* ldattach GIGASET_M101 /dev/ttyS0
*
* =====================================================================
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
* =====================================================================
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <getopt.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <termios.h>
#include <unistd.h>
#include <err.h>
#include "c.h"
#include "nls.h"
#define dbg(format, arg...) \
do { if (debug) fprintf(stderr , "%s:" format "\n" , progname , ## arg); } while (0)
#ifndef N_GIGASET_M101
# define N_GIGASET_M101 16
#endif
#ifndef N_PPS
# define N_PPS 18
#endif
/* attach a line discipline ioctl */
#ifndef TIOCSETD
# define TIOCSETD 0x5423
#endif
static const char *progname;
static int debug = 0;
struct ld_table {
const char *name;
int value;
};
/* currently supported line disciplines, plus some aliases */
static const struct ld_table ld_discs[] =
{
{ "TTY", N_TTY },
{ "SLIP", N_SLIP },
{ "MOUSE", N_MOUSE },
{ "PPP", N_PPP },
{ "STRIP", N_STRIP },
{ "AX25", N_AX25 },
{ "X25", N_X25 },
{ "6PACK", N_6PACK },
{ "R3964", N_R3964 },
{ "IRDA", N_IRDA },
{ "HDLC", N_HDLC },
{ "SYNC_PPP", N_SYNC_PPP },
{ "SYNCPPP", N_SYNC_PPP },
{ "HCI", N_HCI },
{ "GIGASET_M101", N_GIGASET_M101 },
{ "GIGASET", N_GIGASET_M101 },
{ "M101", N_GIGASET_M101 },
{ "PPS", N_PPS },
{ NULL, 0 }
};
/* known c_iflag names */
static const struct ld_table ld_iflags[] =
{
{ "IGNBRK", IGNBRK },
{ "BRKINT", BRKINT },
{ "IGNPAR", IGNPAR },
{ "PARMRK", PARMRK },
{ "INPCK", INPCK },
{ "ISTRIP", ISTRIP },
{ "INLCR", INLCR },
{ "IGNCR", IGNCR },
{ "ICRNL", ICRNL },
{ "IUCLC", IUCLC },
{ "IXON", IXON },
{ "IXANY", IXANY },
{ "IXOFF", IXOFF },
{ "IMAXBEL", IMAXBEL },
{ "IUTF8", IUTF8 },
{ NULL, 0 }
};
static int lookup_table(const struct ld_table *tab, const char *str)
{
const struct ld_table *t;
for (t = tab; t && t->name; t++)
if (!strcasecmp(t->name, str))
return t->value;
return -1;
}
static void print_table(FILE *out, const struct ld_table *tab)
{
const struct ld_table *t;
int i;
for (t = tab, i = 1; t && t->name; t++, i++) {
fprintf(out, " %-10s", t->name);
if (!(i % 3))
fputc('\n', out);
}
}
static int parse_iflag(char *str, int *set_iflag, int *clr_iflag)
{
int iflag;
char *s, *end;
for (s = strtok(str, ","); s != NULL; s = strtok(NULL, ",")) {
if (*s == '-')
s++;
if ((iflag = lookup_table(ld_iflags, s)) < 0) {
iflag = strtol(s, &end, 0);
if (*end || iflag < 0)
errx(EXIT_FAILURE, _("invalid iflag: %s"), s);
}
if (s > str && *(s - 1) == '-')
*clr_iflag |= iflag;
else
*set_iflag |= iflag;
}
dbg("iflag (set/clear): %d/%d", *set_iflag, *clr_iflag);
return 0;
}
static void __attribute__((__noreturn__)) usage(int exitcode)
{
fprintf(stderr,
_("\nUsage: %s [ -dhV78neo12 ] [ -s <speed> ] [ -i [-]<iflag> ] <ldisc> <device>\n"),
progname);
fputs(_("\nKnown <ldisc> names:\n"), stderr);
print_table(stderr, ld_discs);
fputs(_("\nKnown <iflag> names:\n"), stderr);
print_table(stderr, ld_iflags);
exit(exitcode);
}
static int my_cfsetspeed(struct termios *ts, int speed)
{
/* Standard speeds
* -- cfsetspeed() is able to translate number to Bxxx constants
*/
if (cfsetspeed(ts, speed) == 0)
return 0;
/* Nonstandard speeds
* -- we have to bypass glibc and set the speed manually (because
* glibc checks for speed and supports Bxxx bit rates only)...
*/
#ifdef _HAVE_STRUCT_TERMIOS_C_ISPEED
# define BOTHER 0010000 /* non standard rate */
dbg("using non-standard speeds");
ts->c_ospeed = ts->c_ispeed = speed;
ts->c_cflag &= ~CBAUD;
ts->c_cflag |= BOTHER;
return 0;
#else
return -1;
#endif
}
int main(int argc, char **argv)
{
int tty_fd;
struct termios ts;
int speed = 0, bits = '-', parity = '-', stop = '-';
int set_iflag = 0, clr_iflag = 0;
int ldisc;
int optc;
char *end;
char *dev;
static const struct option opttbl[] = {
{"speed", 1, 0, 's'},
{"sevenbits", 0, 0, '7'},
{"eightbits", 0, 0, '8'},
{"noparity", 0, 0, 'n'},
{"evenparity", 0, 0, 'e'},
{"oddparity", 0, 0, 'o'},
{"onestopbit", 0, 0, '1'},
{"twostopbits", 0, 0, '2'},
{"iflag", 1, 0, 'i'},
{"help", 0, 0, 'h'},
{"version", 0, 0, 'V'},
{"debug", 0, 0, 'd'},
{0, 0, 0, 0}
};
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
/* parse options */
progname = program_invocation_short_name;
if (argc == 0)
usage(EXIT_SUCCESS);
while ((optc = getopt_long(argc, argv, "dhV78neo12s:i:", opttbl, NULL)) >= 0) {
switch (optc) {
case 'd':
debug++;
break;
case '1':
case '2':
stop = optc;
break;
case '7':
case '8':
bits = optc;
break;
case 'n':
case 'e':
case 'o':
parity = optc;
break;
case 's':
speed = strtol(optarg, &end, 10);
if (*end || speed <= 0)
errx(EXIT_FAILURE, _("invalid speed: %s"), optarg);
break;
case 'i':
parse_iflag(optarg, &set_iflag, &clr_iflag);
break;
case 'V':
printf(_("ldattach from %s\n"), PACKAGE_STRING);
break;
case 'h':
usage(EXIT_SUCCESS);
default:
warnx(_("invalid option"));
usage(EXIT_FAILURE);
}
}
if (argc - optind != 2)
usage(EXIT_FAILURE);
/* parse line discipline specification */
ldisc = lookup_table(ld_discs, argv[optind]);
if (ldisc < 0) {
ldisc = strtol(argv[optind], &end, 0);
if (*end || ldisc < 0)
errx(EXIT_FAILURE, _("invalid line discipline: %s"), argv[optind]);
}
/* open device */
dev = argv[optind+1];
if ((tty_fd = open(dev, O_RDWR|O_NOCTTY)) < 0)
err(EXIT_FAILURE, _("cannot open %s"), dev);
if (!isatty(tty_fd))
errx(EXIT_FAILURE, _("%s is not a serial line"), dev);
dbg("opened %s", dev);
/* set line speed and format */
if (tcgetattr(tty_fd, &ts) < 0)
err(EXIT_FAILURE, _("cannot get terminal attributes for %s"), dev);
cfmakeraw(&ts);
if (speed && my_cfsetspeed(&ts, speed) < 0)
errx(EXIT_FAILURE, _("speed %d unsupported"), speed);
switch (stop) {
case '1':
ts.c_cflag &= ~CSTOPB;
break;
case '2':
ts.c_cflag |= CSTOPB;
break;
}
switch (bits) {
case '7':
ts.c_cflag = (ts.c_cflag & ~CSIZE) | CS7;
break;
case '8':
ts.c_cflag = (ts.c_cflag & ~CSIZE) | CS8;
break;
}
switch (parity) {
case 'n':
ts.c_cflag &= ~(PARENB|PARODD);
break;
case 'e':
ts.c_cflag |= PARENB;
ts.c_cflag &= ~PARODD;
break;
case 'o':
ts.c_cflag |= (PARENB|PARODD);
break;
}
ts.c_cflag |= CREAD; /* just to be on the safe side */
ts.c_iflag |= set_iflag;
ts.c_iflag &= ~clr_iflag;
if (tcsetattr(tty_fd, TCSAFLUSH, &ts) < 0)
err(EXIT_FAILURE, _("cannot set terminal attributes for %s"), dev);
dbg("set to raw %d %c%c%c: cflag=0x%x",
speed, bits, parity, stop, ts.c_cflag);
/* Attach the line discpline. */
if (ioctl(tty_fd, TIOCSETD, &ldisc) < 0)
err(EXIT_FAILURE, _("cannot set line discipline"));
dbg("line discipline set to %d", ldisc);
/* Go into background if not in debug mode. */
if (!debug && daemon(0, 0) < 0)
err(EXIT_FAILURE, _("cannot daemonize"));
/* Sleep to keep the line discipline active. */
pause();
exit(EXIT_SUCCESS);
}
