/* $OpenBSD: ldattach.c,v 1.3 2007/11/13 19:32:34 mbalmer Exp $ */ /* * Copyright (c) 2007 Marc Balmer * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include __dead void usage(void); void coroner(int); volatile sig_atomic_t dying = 0; __dead void usage(void) { extern char *__progname; fprintf(stderr, "usage: %s [-7dehmo] [-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, 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, "7dehmos:t:")) != -1) { switch (ch) { 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 { 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 (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; }