| 1 | /* |
| 2 | * Copyright (c) 1988 Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This code is derived from software contributed to Berkeley by |
| 6 | * Rick Adams. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. All advertising materials mentioning features or use of this software |
| 17 | * must display the following acknowledgement: |
| 18 | * This product includes software developed by the University of |
| 19 | * California, Berkeley and its contributors. |
| 20 | * 4. Neither the name of the University nor the names of its contributors |
| 21 | * may be used to endorse or promote products derived from this software |
| 22 | * without specific prior written permission. |
| 23 | * |
| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 34 | * SUCH DAMAGE. |
| 35 | * |
| 36 | * @(#) Copyright (c) 1988 Regents of the University of California. All rights reserved. |
| 37 | * @(#)slattach.c 4.6 (Berkeley) 6/1/90 |
| 38 | * $FreeBSD: src/sbin/slattach/slattach.c,v 1.36 1999/08/28 00:14:25 peter Exp $ |
| 39 | * $DragonFly: src/sbin/slattach/slattach.c,v 1.6 2005/02/02 07:59:48 cpressey Exp $ |
| 40 | */ |
| 41 | |
| 42 | #include <sys/types.h> |
| 43 | #include <sys/ioctl.h> |
| 44 | #include <sys/socket.h> |
| 45 | |
| 46 | #include <err.h> |
| 47 | #include <fcntl.h> |
| 48 | #include <libutil.h> |
| 49 | #include <paths.h> |
| 50 | #include <signal.h> |
| 51 | #include <stdio.h> |
| 52 | #include <stdlib.h> |
| 53 | #include <strings.h> |
| 54 | #include <syslog.h> |
| 55 | #include <termios.h> |
| 56 | #include <unistd.h> |
| 57 | |
| 58 | #include <net/if.h> |
| 59 | #include <net/slip.h> |
| 60 | |
| 61 | #define DEFAULT_BAUD 9600 |
| 62 | |
| 63 | static void sighup_handler(int); /* SIGHUP handler */ |
| 64 | static void sigint_handler(int); /* SIGINT handler */ |
| 65 | static void sigterm_handler(int); /* SIGTERM handler */ |
| 66 | static void sigurg_handler(int); /* SIGURG handler */ |
| 67 | static void exit_handler(int); /* run exit_cmd iff specified upon exit. */ |
| 68 | static void setup_line(int); /* configure terminal settings */ |
| 69 | static void slip_discipline(void); /* switch to slip line discipline */ |
| 70 | static void configure_network(void); /* configure slip interface */ |
| 71 | static void acquire_line(void); /* get tty device as controlling terminal */ |
| 72 | static void usage(void); |
| 73 | |
| 74 | int fd = -1; |
| 75 | char *dev = (char *)0; /* path name of the tty (e.g. /dev/tty01) */ |
| 76 | char *dvname; /* basename of dev */ |
| 77 | int locked = 0; /* uucp lock active */ |
| 78 | int flow_control = 0; /* non-zero to enable hardware flow control. */ |
| 79 | int modem_control = HUPCL; /* !CLOCAL+HUPCL iff we watch carrier. */ |
| 80 | int comstate; /* TIOCMGET current state of serial driver */ |
| 81 | int redial_on_startup = 0; /* iff non-zero execute redial_cmd on startup */ |
| 82 | speed_t speed = DEFAULT_BAUD; /* baud rate of tty */ |
| 83 | int slflags = 0; /* compression flags */ |
| 84 | int unit = -1; /* slip device unit number */ |
| 85 | int foreground = 0; /* act as demon if zero, else don't fork. */ |
| 86 | int keepal = 0; /* keepalive timeout */ |
| 87 | int outfill = 0; /* outfill timeout */ |
| 88 | int sl_unit = -1; /* unit number */ |
| 89 | int uucp_lock = 0; /* do uucp locking */ |
| 90 | int exiting = 0; /* already running exit_handler */ |
| 91 | |
| 92 | struct termios tty; /* tty configuration/state */ |
| 93 | |
| 94 | char tty_path[32]; /* path name of the tty (e.g. /dev/tty01) */ |
| 95 | char pidfilename[40]; /* e.g. /var/run/slattach.tty01.pid */ |
| 96 | char *redial_cmd = 0; /* command to exec upon shutdown. */ |
| 97 | char *config_cmd = 0; /* command to exec if slip unit changes. */ |
| 98 | char *exit_cmd = 0; /* command to exec before exiting. */ |
| 99 | |
| 100 | static void |
| 101 | usage(void) |
| 102 | { |
| 103 | fprintf(stderr, "%s\n%s\n", |
| 104 | "usage: slattach [-acfhlnz] [-e command] [-r command] [-s speed] [-u command]", |
| 105 | " [-L] [-K timeout] [-O timeout] [-S unit] device"); |
| 106 | /* do not exit here */ |
| 107 | } |
| 108 | |
| 109 | int |
| 110 | main(int argc, char **argv) |
| 111 | { |
| 112 | int option; |
| 113 | |
| 114 | while ((option = getopt(argc, argv, "ace:fhlnr:s:u:zLK:O:S:")) != -1) { |
| 115 | switch (option) { |
| 116 | case 'a': |
| 117 | slflags |= IFF_LINK2; |
| 118 | slflags &= ~IFF_LINK0; |
| 119 | break; |
| 120 | case 'c': |
| 121 | slflags |= IFF_LINK0; |
| 122 | slflags &= ~IFF_LINK2; |
| 123 | break; |
| 124 | case 'e': |
| 125 | exit_cmd = (char*) strdup (optarg); |
| 126 | break; |
| 127 | case 'f': |
| 128 | foreground = 1; |
| 129 | break; |
| 130 | case 'h': |
| 131 | flow_control |= CRTSCTS; |
| 132 | break; |
| 133 | case 'l': |
| 134 | modem_control = CLOCAL; /* clear HUPCL too */ |
| 135 | break; |
| 136 | case 'n': |
| 137 | slflags |= IFF_LINK1; |
| 138 | break; |
| 139 | case 'r': |
| 140 | redial_cmd = (char*) strdup (optarg); |
| 141 | break; |
| 142 | case 's': |
| 143 | speed = atoi(optarg); |
| 144 | break; |
| 145 | case 'u': |
| 146 | config_cmd = (char*) strdup (optarg); |
| 147 | break; |
| 148 | case 'z': |
| 149 | redial_on_startup = 1; |
| 150 | break; |
| 151 | case 'L': |
| 152 | uucp_lock = 1; |
| 153 | break; |
| 154 | case 'K': |
| 155 | keepal = atoi(optarg); |
| 156 | break; |
| 157 | case 'O': |
| 158 | outfill = atoi(optarg); |
| 159 | break; |
| 160 | case 'S': |
| 161 | sl_unit = atoi(optarg); |
| 162 | break; |
| 163 | case '?': |
| 164 | default: |
| 165 | usage(); |
| 166 | exit_handler(1); |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | if (optind == argc - 1) |
| 171 | dev = argv[optind]; |
| 172 | |
| 173 | if (optind < (argc - 1)) |
| 174 | warnx("too many args, first='%s'", argv[optind]); |
| 175 | if (optind > (argc - 1)) |
| 176 | warnx("not enough args"); |
| 177 | if (dev == (char *)0) { |
| 178 | usage(); |
| 179 | exit_handler(2); |
| 180 | } |
| 181 | if (strncmp(_PATH_DEV, dev, sizeof(_PATH_DEV) - 1)) { |
| 182 | strcpy(tty_path, _PATH_DEV); |
| 183 | strcat(tty_path, "/"); |
| 184 | strncat(tty_path, dev, 10); |
| 185 | dev = tty_path; |
| 186 | } |
| 187 | dvname = strrchr(dev, '/'); /* always succeeds */ |
| 188 | dvname++; /* trailing tty pathname component */ |
| 189 | snprintf(pidfilename, sizeof(pidfilename), |
| 190 | "%sslattach.%s.pid", _PATH_VARRUN, dvname); |
| 191 | printf("%s\n",pidfilename); |
| 192 | |
| 193 | if (!foreground) |
| 194 | daemon(0,0); /* fork, setsid, chdir /, and close std*. */ |
| 195 | /* daemon() closed stderr, so log errors from here on. */ |
| 196 | openlog("slattach",LOG_CONS|LOG_PID,LOG_DAEMON); |
| 197 | |
| 198 | acquire_line(); /* get tty device as controlling terminal */ |
| 199 | setup_line(0); /* configure for slip line discipline */ |
| 200 | slip_discipline(); /* switch to slip line discipline */ |
| 201 | |
| 202 | /* upon INT log a timestamp and exit. */ |
| 203 | if (signal(SIGINT,sigint_handler) == SIG_ERR) |
| 204 | syslog(LOG_NOTICE,"cannot install SIGINT handler: %m"); |
| 205 | /* upon TERM log a timestamp and exit. */ |
| 206 | if (signal(SIGTERM,sigterm_handler) == SIG_ERR) |
| 207 | syslog(LOG_NOTICE,"cannot install SIGTERM handler: %m"); |
| 208 | /* upon HUP redial and reconnect. */ |
| 209 | if (signal(SIGHUP,sighup_handler) == SIG_ERR) |
| 210 | syslog(LOG_NOTICE,"cannot install SIGHUP handler: %m"); |
| 211 | |
| 212 | if (redial_on_startup) |
| 213 | sighup_handler(0); |
| 214 | else if (!(modem_control & CLOCAL)) { |
| 215 | if (ioctl(fd, TIOCMGET, &comstate) < 0) |
| 216 | syslog(LOG_NOTICE,"cannot get carrier state: %m"); |
| 217 | if (!(comstate & TIOCM_CD)) { /* check for carrier */ |
| 218 | /* force a redial if no carrier */ |
| 219 | kill (getpid(), SIGHUP); |
| 220 | } else |
| 221 | configure_network(); |
| 222 | } else |
| 223 | configure_network(); /* configure the network if needed. */ |
| 224 | |
| 225 | for (;;) { |
| 226 | sigset_t mask; |
| 227 | sigemptyset(&mask); |
| 228 | sigsuspend(&mask); |
| 229 | } |
| 230 | } |
| 231 | |
| 232 | /* Close all FDs, fork, reopen tty port as 0-2, and make it the |
| 233 | controlling terminal for our process group. */ |
| 234 | static void |
| 235 | acquire_line(void) |
| 236 | { |
| 237 | int ttydisc = TTYDISC; |
| 238 | int oflags; |
| 239 | FILE *pid_file; |
| 240 | |
| 241 | /* reset to tty discipline */ |
| 242 | if (fd >= 0 && ioctl(fd, TIOCSETD, &ttydisc) < 0) { |
| 243 | syslog(LOG_ERR, "ioctl(TIOCSETD): %m"); |
| 244 | exit_handler(1); |
| 245 | } |
| 246 | |
| 247 | close(STDIN_FILENO); /* close FDs before forking. */ |
| 248 | close(STDOUT_FILENO); |
| 249 | close(STDERR_FILENO); |
| 250 | if (fd > 2) |
| 251 | close(fd); |
| 252 | |
| 253 | signal(SIGHUP, SIG_IGN); /* ignore HUP signal when parent dies. */ |
| 254 | if (daemon(0,0)) { /* fork, setsid, chdir /, and close std*. */ |
| 255 | syslog(LOG_ERR, "daemon(0,0): %m"); |
| 256 | exit_handler(1); |
| 257 | } |
| 258 | |
| 259 | while (getppid () != 1) |
| 260 | sleep (1); /* Wait for parent to die. */ |
| 261 | |
| 262 | /* create PID file */ |
| 263 | if((pid_file = fopen(pidfilename, "w"))) { |
| 264 | fprintf(pid_file, "%ld\n", (long)getpid()); |
| 265 | fclose(pid_file); |
| 266 | } |
| 267 | |
| 268 | if (signal(SIGHUP,sighup_handler) == SIG_ERR) /* Re-enable HUP signal */ |
| 269 | syslog(LOG_NOTICE,"cannot install SIGHUP handler: %m"); |
| 270 | |
| 271 | if (uucp_lock) { |
| 272 | /* unlock not needed here, always re-lock with new pid */ |
| 273 | int res; |
| 274 | if ((res = uu_lock(dvname)) != UU_LOCK_OK) { |
| 275 | if (res != UU_LOCK_INUSE) |
| 276 | syslog(LOG_ERR, "uu_lock: %s", uu_lockerr(res)); |
| 277 | syslog(LOG_ERR, "can't lock %s", dev); |
| 278 | exit_handler(1); |
| 279 | } |
| 280 | locked = 1; |
| 281 | } |
| 282 | |
| 283 | if ((fd = open(dev, O_RDWR | O_NONBLOCK, 0)) < 0) { |
| 284 | syslog(LOG_ERR, "open(%s) %m", dev); |
| 285 | exit_handler(1); |
| 286 | } |
| 287 | /* Turn off O_NONBLOCK for dumb redialers, if any. */ |
| 288 | if ((oflags = fcntl(fd, F_GETFL)) == -1) { |
| 289 | syslog(LOG_ERR, "fcntl(F_GETFL) failed: %m"); |
| 290 | exit_handler(1); |
| 291 | } |
| 292 | if (fcntl(fd, F_SETFL, oflags & ~O_NONBLOCK) == -1) { |
| 293 | syslog(LOG_ERR, "fcntl(F_SETFL) failed: %m"); |
| 294 | exit_handler(1); |
| 295 | } |
| 296 | dup2(fd, STDIN_FILENO); |
| 297 | dup2(fd, STDOUT_FILENO); |
| 298 | dup2(fd, STDERR_FILENO); |
| 299 | if (fd > 2) |
| 300 | close (fd); |
| 301 | fd = STDIN_FILENO; |
| 302 | |
| 303 | /* acquire the serial line as a controlling terminal. */ |
| 304 | if (ioctl(fd, TIOCSCTTY, 0) < 0) { |
| 305 | syslog(LOG_ERR,"ioctl(TIOCSCTTY): %m"); |
| 306 | exit_handler(1); |
| 307 | } |
| 308 | /* Make us the foreground process group associated with the |
| 309 | slip line which is our controlling terminal. */ |
| 310 | if (tcsetpgrp(fd, getpid()) < 0) |
| 311 | syslog(LOG_NOTICE,"tcsetpgrp failed: %m"); |
| 312 | } |
| 313 | |
| 314 | /* Set the tty flags and set DTR. */ |
| 315 | /* Call as setup_line(CLOCAL) to force clocal assertion. */ |
| 316 | static void |
| 317 | setup_line(int cflag) |
| 318 | { |
| 319 | tty.c_lflag = tty.c_iflag = tty.c_oflag = 0; |
| 320 | tty.c_cflag = CREAD | CS8 | flow_control | modem_control | cflag; |
| 321 | cfsetispeed(&tty, speed); |
| 322 | cfsetospeed(&tty, speed); |
| 323 | /* set the line speed and flow control */ |
| 324 | if (tcsetattr(fd, TCSAFLUSH, &tty) < 0) { |
| 325 | syslog(LOG_ERR, "tcsetattr(TCSAFLUSH): %m"); |
| 326 | exit_handler(1); |
| 327 | } |
| 328 | /* set data terminal ready */ |
| 329 | if (ioctl(fd, TIOCSDTR) < 0) { |
| 330 | syslog(LOG_ERR, "ioctl(TIOCSDTR): %m"); |
| 331 | exit_handler(1); |
| 332 | } |
| 333 | } |
| 334 | |
| 335 | /* Put the line in slip discipline. */ |
| 336 | static void |
| 337 | slip_discipline(void) |
| 338 | { |
| 339 | struct ifreq ifr; |
| 340 | int slipdisc = SLIPDISC; |
| 341 | int s, tmp_unit = -1; |
| 342 | |
| 343 | /* Switch to slip line discipline. */ |
| 344 | if (ioctl(fd, TIOCSETD, &slipdisc) < 0) { |
| 345 | syslog(LOG_ERR, "ioctl(TIOCSETD): %m"); |
| 346 | exit_handler(1); |
| 347 | } |
| 348 | |
| 349 | if (sl_unit >= 0 && ioctl(fd, SLIOCSUNIT, &sl_unit) < 0) { |
| 350 | syslog(LOG_ERR, "ioctl(SLIOCSUNIT): %m"); |
| 351 | exit_handler(1); |
| 352 | } |
| 353 | |
| 354 | /* find out what unit number we were assigned */ |
| 355 | if (ioctl(fd, SLIOCGUNIT, (caddr_t)&tmp_unit) < 0) { |
| 356 | syslog(LOG_ERR, "ioctl(SLIOCGUNIT): %m"); |
| 357 | exit_handler(1); |
| 358 | } |
| 359 | |
| 360 | if (tmp_unit < 0) { |
| 361 | syslog(LOG_ERR, "bad unit (%d) from ioctl(SLIOCGUNIT)",tmp_unit); |
| 362 | exit_handler(1); |
| 363 | } |
| 364 | |
| 365 | if (keepal > 0) { |
| 366 | signal(SIGURG, sigurg_handler); |
| 367 | if (ioctl(fd, SLIOCSKEEPAL, &keepal) < 0) { |
| 368 | syslog(LOG_ERR, "ioctl(SLIOCSKEEPAL): %m"); |
| 369 | exit_handler(1); |
| 370 | } |
| 371 | } |
| 372 | if (outfill > 0 && ioctl(fd, SLIOCSOUTFILL, &outfill) < 0) { |
| 373 | syslog(LOG_ERR, "ioctl(SLIOCSOUTFILL): %m"); |
| 374 | exit_handler(1); |
| 375 | } |
| 376 | |
| 377 | /* open a socket as the handle to the interface */ |
| 378 | s = socket(AF_INET, SOCK_DGRAM, 0); |
| 379 | if (s < 0) { |
| 380 | syslog(LOG_ERR, "socket: %m"); |
| 381 | exit_handler(1); |
| 382 | } |
| 383 | sprintf(ifr.ifr_name, "sl%d", tmp_unit); |
| 384 | |
| 385 | /* get the flags for the interface */ |
| 386 | if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) { |
| 387 | syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m"); |
| 388 | exit_handler(1); |
| 389 | } |
| 390 | |
| 391 | /* Assert any compression or no-icmp flags. */ |
| 392 | #define SLMASK (~(IFF_LINK0 | IFF_LINK1 | IFF_LINK2)) |
| 393 | ifr.ifr_flags &= SLMASK; |
| 394 | ifr.ifr_flags |= slflags; |
| 395 | if (ioctl(s, SIOCSIFFLAGS, (caddr_t)&ifr) < 0) { |
| 396 | syslog(LOG_ERR, "ioctl (SIOCSIFFLAGS): %m"); |
| 397 | exit_handler(1); |
| 398 | } |
| 399 | close(s); |
| 400 | } |
| 401 | |
| 402 | /* configure the interface, e.g. by passing the unit number to a script. */ |
| 403 | static void |
| 404 | configure_network(void) |
| 405 | { |
| 406 | int new_unit; |
| 407 | |
| 408 | /* find out what unit number we were assigned */ |
| 409 | if (ioctl(fd, SLIOCGUNIT, (caddr_t)&new_unit) < 0) { |
| 410 | syslog(LOG_ERR, "ioctl(SLIOCGUNIT): %m"); |
| 411 | exit_handler(1); |
| 412 | } |
| 413 | /* iff the unit number changes either invoke config_cmd or punt. */ |
| 414 | if (config_cmd) { |
| 415 | char *s; |
| 416 | s = (char*) malloc(strlen(config_cmd) + 32); |
| 417 | if (s == NULL) { |
| 418 | syslog(LOG_ERR, "malloc failed"); |
| 419 | exit(1); |
| 420 | } |
| 421 | sprintf (s, "%s %d %d", config_cmd, unit, new_unit); |
| 422 | syslog(LOG_NOTICE, "configuring %s (sl%d):", dev, unit); |
| 423 | syslog(LOG_NOTICE, " '%s'", s); |
| 424 | system(s); |
| 425 | free (s); |
| 426 | unit = new_unit; |
| 427 | } else { |
| 428 | /* don't compare unit numbers if this is the first time to attach. */ |
| 429 | if (unit < 0) |
| 430 | unit = new_unit; |
| 431 | if (new_unit != unit) { |
| 432 | syslog(LOG_ERR, |
| 433 | "slip unit changed from sl%d to sl%d, but no -u CMD was specified!", |
| 434 | unit, new_unit); |
| 435 | exit_handler(1); |
| 436 | } |
| 437 | syslog(LOG_NOTICE,"sl%d connected to %s at %d baud",unit,dev,speed); |
| 438 | } |
| 439 | } |
| 440 | |
| 441 | /* sighup_handler() is invoked when carrier drops, eg. before redial. */ |
| 442 | static void |
| 443 | sighup_handler(int signo __unused) |
| 444 | { |
| 445 | if(exiting) return; |
| 446 | |
| 447 | if (redial_cmd == NULL) { |
| 448 | syslog(LOG_NOTICE,"SIGHUP on %s (sl%d); exiting", dev, unit); |
| 449 | exit_handler(1); |
| 450 | } |
| 451 | again: |
| 452 | /* invoke a shell for redial_cmd or punt. */ |
| 453 | if (*redial_cmd) { /* Non-empty redial command */ |
| 454 | syslog(LOG_NOTICE,"SIGHUP on %s (sl%d); running '%s'", |
| 455 | dev, unit, redial_cmd); |
| 456 | acquire_line(); /* reopen dead line */ |
| 457 | setup_line(CLOCAL); |
| 458 | if (locked) { |
| 459 | if (uucp_lock) |
| 460 | uu_unlock(dvname); /* for redial */ |
| 461 | locked = 0; |
| 462 | } |
| 463 | if (system(redial_cmd)) |
| 464 | goto again; |
| 465 | if (uucp_lock) { |
| 466 | int res; |
| 467 | if ((res = uu_lock(dvname)) != UU_LOCK_OK) { |
| 468 | if (res != UU_LOCK_INUSE) |
| 469 | syslog(LOG_ERR, "uu_lock: %s", uu_lockerr(res)); |
| 470 | syslog(LOG_ERR, "can't relock %s after %s, aborting", |
| 471 | dev, redial_cmd); |
| 472 | exit_handler(1); |
| 473 | } |
| 474 | locked = 1; |
| 475 | } |
| 476 | /* Now check again for carrier (dial command is done): */ |
| 477 | if (!(modem_control & CLOCAL)) { |
| 478 | tty.c_cflag &= ~CLOCAL; |
| 479 | if (tcsetattr(fd, TCSAFLUSH, &tty) < 0) { |
| 480 | syslog(LOG_ERR, "tcsetattr(TCSAFLUSH): %m"); |
| 481 | exit_handler(1); |
| 482 | } |
| 483 | ioctl(fd, TIOCMGET, &comstate); |
| 484 | if (!(comstate & TIOCM_CD)) { /* check for carrier */ |
| 485 | /* force a redial if no carrier */ |
| 486 | goto again; |
| 487 | } |
| 488 | } else |
| 489 | setup_line(0); |
| 490 | } else { /* Empty redial command */ |
| 491 | syslog(LOG_NOTICE,"SIGHUP on %s (sl%d); reestablish connection", |
| 492 | dev, unit); |
| 493 | acquire_line(); /* reopen dead line */ |
| 494 | setup_line(0); /* restore ospeed from hangup (B0) */ |
| 495 | /* If modem control, just wait for carrier before attaching. |
| 496 | If no modem control, just fall through immediately. */ |
| 497 | if (!(modem_control & CLOCAL)) { |
| 498 | int carrier = 0; |
| 499 | |
| 500 | syslog(LOG_NOTICE, "waiting for carrier on %s (sl%d)", |
| 501 | dev, unit); |
| 502 | /* Now wait for carrier before attaching line. */ |
| 503 | /* We must poll since CLOCAL prevents signal. */ |
| 504 | while (! carrier) { |
| 505 | sleep(2); |
| 506 | ioctl(fd, TIOCMGET, &comstate); |
| 507 | if (comstate & TIOCM_CD) |
| 508 | carrier = 1; |
| 509 | } |
| 510 | syslog(LOG_NOTICE, "carrier now present on %s (sl%d)", |
| 511 | dev, unit); |
| 512 | } |
| 513 | } |
| 514 | slip_discipline(); |
| 515 | configure_network(); |
| 516 | } |
| 517 | |
| 518 | /* Signal handler for SIGINT. We just log and exit. */ |
| 519 | static void |
| 520 | sigint_handler(int signo __unused) |
| 521 | { |
| 522 | if(exiting) return; |
| 523 | syslog(LOG_NOTICE,"SIGINT on %s (sl%d); exiting",dev,unit); |
| 524 | exit_handler(0); |
| 525 | } |
| 526 | |
| 527 | /* Signal handler for SIGURG. */ |
| 528 | static void |
| 529 | sigurg_handler(int signo __unused) |
| 530 | { |
| 531 | int ttydisc = TTYDISC; |
| 532 | |
| 533 | signal(SIGURG, SIG_IGN); |
| 534 | if(exiting) return; |
| 535 | syslog(LOG_NOTICE,"SIGURG on %s (sl%d); hangup",dev,unit); |
| 536 | if (ioctl(fd, TIOCSETD, &ttydisc) < 0) { |
| 537 | syslog(LOG_ERR, "ioctl(TIOCSETD): %m"); |
| 538 | exit_handler(1); |
| 539 | } |
| 540 | cfsetospeed(&tty, B0); |
| 541 | if (tcsetattr(fd, TCSANOW, &tty) < 0) { |
| 542 | syslog(LOG_ERR, "tcsetattr(TCSANOW): %m"); |
| 543 | exit_handler(1); |
| 544 | } |
| 545 | /* Need to go to sighup handler in any case */ |
| 546 | if (modem_control & CLOCAL) |
| 547 | kill (getpid(), SIGHUP); |
| 548 | |
| 549 | } |
| 550 | |
| 551 | /* Signal handler for SIGTERM. We just log and exit. */ |
| 552 | static void |
| 553 | sigterm_handler(int signo __unused) |
| 554 | { |
| 555 | if(exiting) return; |
| 556 | syslog(LOG_NOTICE,"SIGTERM on %s (sl%d); exiting",dev,unit); |
| 557 | exit_handler(0); |
| 558 | } |
| 559 | |
| 560 | /* Run config_cmd if specified before exiting. */ |
| 561 | static void |
| 562 | exit_handler(int ret) |
| 563 | { |
| 564 | if(exiting) return; |
| 565 | exiting = 1; |
| 566 | /* |
| 567 | * First close the slip line in case exit_cmd wants it (like to hang |
| 568 | * up a modem or something). |
| 569 | */ |
| 570 | if (fd != -1) |
| 571 | close(fd); |
| 572 | if (uucp_lock && locked) |
| 573 | uu_unlock(dvname); |
| 574 | |
| 575 | /* Remove the PID file */ |
| 576 | unlink(pidfilename); |
| 577 | |
| 578 | if (config_cmd) { |
| 579 | char *s; |
| 580 | s = (char*) malloc(strlen(config_cmd) + 32); |
| 581 | if (s == NULL) { |
| 582 | syslog(LOG_ERR, "malloc failed"); |
| 583 | exit(1); |
| 584 | } |
| 585 | sprintf (s, "%s %d -1", config_cmd, unit); |
| 586 | syslog(LOG_NOTICE, "deconfiguring %s (sl%d):", dev, unit); |
| 587 | syslog(LOG_NOTICE, " '%s'", s); |
| 588 | system(s); |
| 589 | free (s); |
| 590 | } |
| 591 | /* invoke a shell for exit_cmd. */ |
| 592 | if (exit_cmd) { |
| 593 | syslog(LOG_NOTICE,"exiting after running %s", exit_cmd); |
| 594 | system(exit_cmd); |
| 595 | } |
| 596 | exit(ret); |
| 597 | } |
| 598 | |
| 599 | /* local variables: */ |
| 600 | /* c-indent-level: 8 */ |
| 601 | /* c-argdecl-indent: 0 */ |
| 602 | /* c-label-offset: -8 */ |
| 603 | /* c-continued-statement-offset: 8 */ |
| 604 | /* c-brace-offset: 0 */ |
| 605 | /* comment-column: 32 */ |
| 606 | /* end: */ |