sbin/startslip/startslip.c

   1 /*-
   2  * Copyright (c) 1990, 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1990, 1991, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)startslip.c      8.1 (Berkeley) 6/5/93
  35  * $FreeBSD: src/sbin/startslip/startslip.c,v 1.31.2.1 2000/05/07 18:26:51 joe Exp $
  36  * $DragonFly: src/sbin/startslip/startslip.c,v 1.4 2003/11/01 17:16:02 drhodus Exp $
  37  */
  38
  39 #include <sys/types.h>
  40 #include <sys/time.h>
  41
  42 #include <err.h>
  43 #include <errno.h>
  44 #include <fcntl.h>
  45 #include <libutil.h>
  46 #include <paths.h>
  47 #include <signal.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <syslog.h>
  52 #include <termios.h>
  53 #include <unistd.h>
  54
  55 #include <net/slip.h>
  56
  57 #define DEFAULT_BAUD    B9600
  58 int     speed = DEFAULT_BAUD;
  59 #define FC_NONE         0       /* flow control: none */
  60 #define FC_HW           1       /* flow control: hardware (RTS/CTS) */
  61 int     flowcontrol = FC_NONE;
  62 int     modem_control = 1;      /* !CLOCAL+HUPCL iff we watch carrier. */
  63 int     sl_unit = -1;
  64 int     uucp_lock = 0;          /* uucp locking */
  65 char    *annex;
  66 char    *username;
  67 int     hup;
  68 int     terminate;
  69 int     locked = 0;             /* uucp lock active */
  70 int     logged_in = 0;
  71 int     wait_time = 60;         /* then back off */
  72 int     script_timeout = 90;    /* connect script default timeout */
  73 time_t  conn_time, start_time;
  74 int     MAXTRIES = 6;           /* w/60 sec and doubling, takes an hour */
  75 #define PIDFILE         "%sstartslip.%s.pid"
  76
  77 #define MAXDIALS 20
  78 char *dials[MAXDIALS];
  79 int diali, dialc;
  80
  81 int fd = -1;
  82 FILE *pfd;
  83 char *dvname, *devicename;
  84 char pidfile[80];
  85
  86 #ifdef DEBUG
  87 int     debug = 1;
  88 #undef LOG_ERR
  89 #undef LOG_INFO
  90 #define syslog fprintf
  91 #define LOG_ERR stderr
  92 #define LOG_INFO stderr
  93 #else
  94 int     debug = 0;
  95 #endif
  96 #define printd  if (debug) printf
  97
  98 int carrier(void);
  99 void down(int);
 100 int getline(char *, int, int, time_t);
 101 static void usage(void);
 102
 103 int
 104 main(int argc, char **argv)
 105 {
 106         char *cp, **ap;
 107         int ch, disc;
 108         void sighup(), sigterm(), sigurg();
 109         FILE *wfd = NULL;
 110         char *dialerstring = 0, buf[BUFSIZ];
 111         int unitnum, keepal = 0, outfill = 0;
 112         char unitname[32];
 113         char *password;
 114         char *upscript = NULL, *downscript = NULL;
 115         int first = 1, tries = 0;
 116         time_t fintimeout;
 117         long lpid;
 118         pid_t pid;
 119         struct termios t;
 120
 121         while ((ch = getopt(argc, argv, "dhlb:s:t:w:A:U:D:W:K:O:S:L")) != -1)
 122                 switch (ch) {
 123                 case 'd':
 124                         debug = 1;
 125                         break;
 126                 case 'b':
 127                         speed = atoi(optarg);
 128                         break;
 129                 case 's':
 130                         if (diali >= MAXDIALS)
 131                                 errx(1, "max dial strings number (%d) exceeded", MAXDIALS);
 132                         dials[diali++] = strdup(optarg);
 133                         break;
 134                 case 't':
 135                         script_timeout = atoi(optarg);
 136                         break;
 137                 case 'w':
 138                         wait_time = atoi(optarg);
 139                         break;
 140                 case 'W':
 141                         MAXTRIES = atoi(optarg);
 142                         break;
 143                 case 'A':
 144                         annex = strdup(optarg);
 145                         break;
 146                 case 'U':
 147                         upscript = strdup(optarg);
 148                         break;
 149                 case 'D':
 150                         downscript = strdup(optarg);
 151                         break;
 152                 case 'L':
 153                         uucp_lock = 1;
 154                         break;
 155                 case 'l':
 156                         modem_control = 0;
 157                         break;
 158                 case 'h':
 159                         flowcontrol = FC_HW;
 160                         break;
 161                 case 'K':
 162                         keepal = atoi(optarg);
 163                         break;
 164                 case 'O':
 165                         outfill = atoi(optarg);
 166                         break;
 167                 case 'S':
 168                         sl_unit = atoi(optarg);
 169                         break;
 170                 case '?':
 171                 default:
 172                         usage();
 173                 }
 174         argc -= optind;
 175         argv += optind;
 176
 177         if (argc != 3)
 178                 usage();
 179
 180         /*
 181          * Copy these so they exist after we clobber them.
 182          */
 183         devicename = strdup(argv[0]);
 184         username = strdup(argv[1]);
 185         password = strdup(argv[2]);
 186
 187         /*
 188          * Security hack.  Do not want private information such as the
 189          * password and possible phone number to be left around.
 190          * So we clobber the arguments.
 191          */
 192         for (ap = argv - optind + 1; ap < argv + 3; ap++)
 193                 for (cp = *ap; *cp != 0; cp++)
 194                         *cp = '\0';
 195
 196         openlog("startslip", LOG_PID|LOG_PERROR, LOG_DAEMON);
 197
 198         if (debug)
 199                 setbuf(stdout, NULL);
 200
 201         signal(SIGTERM, sigterm);
 202         if ((dvname = strrchr(devicename, '/')) == NULL)
 203                 dvname = devicename;
 204         else
 205                 dvname++;
 206         if (snprintf(pidfile, sizeof(pidfile), PIDFILE, _PATH_VARRUN, dvname) >= sizeof(pidfile))
 207                 usage();
 208
 209         if ((pfd = fopen(pidfile, "r")) != NULL) {
 210                 if (fscanf(pfd, "%ld\n", &lpid) == 1) {
 211                         pid = lpid;
 212                         if (pid == lpid && pid > 0)
 213                                 kill(pid, SIGTERM);
 214                 }
 215                 fclose(pfd);
 216                 pfd = NULL;     /* not remove pidfile yet */
 217                 sleep(5);       /* allow down script to be completed */
 218         } else
 219 restart:
 220         signal(SIGHUP, SIG_IGN);
 221         signal(SIGURG, SIG_IGN);
 222         hup = 0;
 223         if (wfd) {
 224                 printd("fclose, ");
 225                 fclose(wfd);
 226                 conn_time = time(NULL) - start_time;
 227                 if (uucp_lock)
 228                         uu_unlock(dvname);
 229                 locked = 0;
 230                 wfd = NULL;
 231                 fd = -1;
 232                 sleep(5);
 233         } else if (fd >= 0) {
 234                 printd("close, ");
 235                 close(fd);
 236                 conn_time = time(NULL) - start_time;
 237                 if (uucp_lock)
 238                         uu_unlock(dvname);
 239                 locked = 0;
 240                 fd = -1;
 241                 sleep(5);
 242         }
 243         if (logged_in) {
 244                 syslog(LOG_INFO, "%s: connection time elapsed: %ld secs",
 245                     username, (long)conn_time);
 246                 sprintf(buf, "LINE=%d %s %s down",
 247                 diali ? (dialc - 1) % diali : 0,
 248                 downscript ? downscript : "/sbin/ifconfig" , unitname);
 249                 (void) system(buf);
 250                 logged_in = 0;
 251         }
 252         if (terminate)
 253                 down(0);
 254         tries++;
 255         if (MAXTRIES > 0 && tries > MAXTRIES) {
 256                 syslog(LOG_ERR, "%s: exiting login after %d tries", username, tries);
 257                 /* ???
 258                 if (first)
 259                 */
 260                         down(3);
 261         }
 262         if (tries > 1) {
 263                 syslog(LOG_INFO, "%s: sleeping %d seconds (%d tries)",
 264                         username, wait_time * (tries - 1), tries);
 265                 sleep(wait_time * (tries - 1));
 266                 if (terminate)
 267                         goto restart;
 268         }
 269
 270         if (daemon(1, debug) < 0) {
 271                 syslog(LOG_ERR, "%s: daemon: %m", username);
 272                 down(2);
 273         }
 274
 275         pid = getpid();
 276         printd("restart: pid %ld: ", (long)pid);
 277         if ((pfd = fopen(pidfile, "w")) != NULL) {
 278                 fprintf(pfd, "%ld\n", (long)pid);
 279                 fclose(pfd);
 280         }
 281         printd("open");
 282         if (uucp_lock) {
 283                 int res;
 284                 if ((res = uu_lock(dvname)) != UU_LOCK_OK) {
 285                         if (res != UU_LOCK_INUSE)
 286                                 syslog(LOG_ERR, "uu_lock: %s", uu_lockerr(res));
 287                         syslog(LOG_ERR, "%s: can't lock %s", username, devicename);
 288                         goto restart;
 289                 }
 290                 locked = 1;
 291         }
 292         if ((fd = open(devicename, O_RDWR | O_NONBLOCK)) < 0) {
 293                 syslog(LOG_ERR, "%s: open %s: %m", username, devicename);
 294                 if (first)
 295                         down(1);
 296                 else {
 297                         if (uucp_lock)
 298                                 uu_unlock(dvname);
 299                         locked = 0;
 300                         goto restart;
 301                 }
 302         }
 303         printd(" %d", fd);
 304         signal(SIGHUP, sighup);
 305         if (ioctl(fd, TIOCSCTTY, 0) < 0) {
 306                 syslog(LOG_ERR, "%s: ioctl (TIOCSCTTY): %m", username);
 307                 down(2);
 308         }
 309         if (tcsetpgrp(fd, getpid()) < 0) {
 310                 syslog(LOG_ERR, "%s: tcsetpgrp failed: %m", username);
 311                 down(2);
 312         }
 313         printd(", ioctl\n");
 314         if (tcgetattr(fd, &t) < 0) {
 315                 syslog(LOG_ERR, "%s: tcgetattr(%s): %m", username, devicename);
 316                 down(2);
 317         }
 318         cfmakeraw(&t);
 319         switch (flowcontrol) {
 320         case FC_HW:
 321                 t.c_cflag |= (CRTS_IFLOW|CCTS_OFLOW);
 322                 break;
 323         case FC_NONE:
 324                 t.c_cflag &= ~(CRTS_IFLOW|CCTS_OFLOW);
 325                 break;
 326         }
 327         if (modem_control)
 328                 t.c_cflag |= HUPCL;
 329         else
 330                 t.c_cflag &= ~(HUPCL);
 331         t.c_cflag |= CLOCAL;    /* until modem commands passes */
 332         cfsetispeed(&t, speed);
 333         cfsetospeed(&t, speed);
 334         if (tcsetattr(fd, TCSAFLUSH, &t) < 0) {
 335                 syslog(LOG_ERR, "%s: tcsetattr(%s): %m", username, devicename);
 336                 down(2);
 337         }
 338         sleep(2);               /* wait for flakey line to settle */
 339         if (hup || terminate)
 340                 goto restart;
 341
 342         wfd = fdopen(fd, "w+");
 343         if (wfd == NULL) {
 344                 syslog(LOG_ERR, "%s: can't fdopen %s: %m", username, devicename);
 345                 down(2);
 346         }
 347         setbuf(wfd, NULL);
 348
 349         if (diali > 0)
 350                 dialerstring = dials[dialc++ % diali];
 351         if (dialerstring) {
 352                 syslog(LOG_INFO, "%s: dialer string: %s\\r", username, dialerstring);
 353                 fprintf(wfd, "%s\r", dialerstring);
 354         }
 355         printd("\n");
 356
 357         fintimeout = time(NULL) + script_timeout;
 358         if (modem_control) {
 359                 printd("waiting for carrier\n");
 360                 while (time(NULL) < fintimeout && !carrier()) {
 361                         sleep(1);
 362                         if (hup || terminate)
 363                                 goto restart;
 364                 }
 365                 if (!carrier())
 366                         goto restart;
 367                 t.c_cflag &= ~(CLOCAL);
 368                 if (tcsetattr(fd, TCSANOW, &t) < 0) {
 369                         syslog(LOG_ERR, "%s: tcsetattr(%s): %m", username, devicename);
 370                         down(2);
 371                 }
 372                 /* Only now we able to receive HUP on carrier drop! */
 373         }
 374
 375         /*
 376          * Log in
 377          */
 378         printd("look for login: ");
 379         for (;;) {
 380                 if (getline(buf, BUFSIZ, fd, fintimeout) == 0 || hup || terminate)
 381                         goto restart;
 382                 if (annex) {
 383                         if (bcmp(buf, annex, strlen(annex)) == 0) {
 384                                 fprintf(wfd, "slip\r");
 385                                 printd("Sent \"slip\"\n");
 386                                 continue;
 387                         }
 388                         if (bcmp(&buf[1], "sername:", 8) == 0) {
 389                                 fprintf(wfd, "%s\r", username);
 390                                 printd("Sent login: %s\n", username);
 391                                 continue;
 392                         }
 393                         if (bcmp(&buf[1], "assword:", 8) == 0) {
 394                                 fprintf(wfd, "%s\r", password);
 395                                 printd("Sent password: %s\n", password);
 396                                 break;
 397                         }
 398                 } else {
 399                         if (strstr(&buf[1], "ogin:") != NULL) {
 400                                 fprintf(wfd, "%s\r", username);
 401                                 printd("Sent login: %s\n", username);
 402                                 continue;
 403                         }
 404                         if (strstr(&buf[1], "assword:") != NULL) {
 405                                 fprintf(wfd, "%s\r", password);
 406                                 printd("Sent password: %s\n", password);
 407                                 break;
 408                         }
 409                 }
 410         }
 411
 412         sleep(5);       /* Wait until login completed */
 413         if (hup || terminate)
 414                 goto restart;
 415         start_time = time(NULL);
 416         /*
 417          * Attach
 418          */
 419         printd("setd");
 420         disc = SLIPDISC;
 421         if (ioctl(fd, TIOCSETD, &disc) < 0) {
 422                 syslog(LOG_ERR, "%s: ioctl (%s, TIOCSETD): %m",
 423                     username, devicename);
 424                 down(2);
 425         }
 426         if (sl_unit >= 0 && ioctl(fd, SLIOCSUNIT, &sl_unit) < 0) {
 427                 syslog(LOG_ERR, "%s: ioctl(SLIOCSUNIT): %m", username);
 428                 down(2);
 429         }
 430         if (ioctl(fd, SLIOCGUNIT, &unitnum) < 0) {
 431                 syslog(LOG_ERR, "%s: ioctl(SLIOCGUNIT): %m", username);
 432                 down(2);
 433         }
 434         sprintf(unitname, "sl%d", unitnum);
 435
 436         if (keepal > 0) {
 437                 signal(SIGURG, sigurg);
 438                 if (ioctl(fd, SLIOCSKEEPAL, &keepal) < 0) {
 439                         syslog(LOG_ERR, "%s: ioctl(SLIOCSKEEPAL): %m", username);
 440                         down(2);
 441                 }
 442         }
 443         if (outfill > 0 && ioctl(fd, SLIOCSOUTFILL, &outfill) < 0) {
 444                 syslog(LOG_ERR, "%s: ioctl(SLIOCSOUTFILL): %m", username);
 445                 down(2);
 446         }
 447
 448         sprintf(buf, "LINE=%d %s %s up",
 449                 diali ? (dialc - 1) % diali : 0,
 450                 upscript ? upscript : "/sbin/ifconfig" , unitname);
 451         (void) system(buf);
 452
 453         printd(", ready\n");
 454         if (!first)
 455                 syslog(LOG_INFO, "%s: reconnected on %s (%d tries)", username, unitname, tries);
 456         else
 457                 syslog(LOG_INFO, "%s: connected on %s", username, unitname);
 458         first = 0;
 459         tries = 0;
 460         logged_in = 1;
 461         while (hup == 0 && terminate == 0) {
 462                 sigpause(0L);
 463                 printd("sigpause return\n");
 464         }
 465         goto restart;
 466         return(0); /* not reached */
 467 }
 468
 469 void
 470 sighup(void)
 471 {
 472
 473         printd("hup\n");
 474         if (hup == 0 && logged_in)
 475                 syslog(LOG_INFO, "%s: got hangup signal", username);
 476         hup = 1;
 477 }
 478
 479 void
 480 sigurg(void)
 481 {
 482
 483         printd("urg\n");
 484         if (hup == 0 && logged_in)
 485                 syslog(LOG_INFO, "%s: got dead line signal", username);
 486         hup = 1;
 487 }
 488
 489 void
 490 sigterm(void)
 491 {
 492
 493         printd("terminate\n");
 494         if (terminate == 0 && logged_in)
 495                 syslog(LOG_INFO, "%s: got terminate signal", username);
 496         terminate = 1;
 497 }
 498
 499 int
 500 getline(char *buf, int size, int fd, time_t fintimeout)
 501 {
 502         register int i;
 503         int ret;
 504         fd_set readfds;
 505         struct timeval tv;
 506         time_t timeout;
 507
 508         size--;
 509         for (i = 0; i < size; i++) {
 510                 if (hup || terminate)
 511                         return (0);
 512                 if ((timeout = fintimeout - time(NULL)) <= 0)
 513                         goto tout;
 514                 FD_ZERO(&readfds);
 515                 FD_SET(fd, &readfds);
 516                 tv.tv_sec = timeout;
 517                 tv.tv_usec = 0;
 518                 if ((ret = select(fd + 1, &readfds, NULL, NULL, &tv)) < 0) {
 519                         if (errno != EINTR)
 520                                 syslog(LOG_ERR, "%s: getline: select: %m", username);
 521                 } else {
 522                         if (! ret) {
 523                         tout:
 524                                 printd("getline: timed out\n");
 525                                 return (0);
 526                         }
 527                         if ((ret = read(fd, &buf[i], 1)) == 1) {
 528                                 buf[i] &= 0177;
 529                                 if (buf[i] == '\r' || buf[i] == '\0') {
 530                                         i--;
 531                                         continue;
 532                                 }
 533                                 if (buf[i] != '\n' && buf[i] != ':')
 534                                         continue;
 535                                 buf[i + 1] = '\0';
 536                                 printd("Got %d: %s", i + 1, buf);
 537                                 return (i+1);
 538                         }
 539                         if (ret <= 0) {
 540                                 if (ret < 0) {
 541                                         syslog(LOG_ERR, "%s: getline: read: %m", username);
 542                                 } else
 543                                         syslog(LOG_ERR, "%s: read returned 0", username);
 544                                 buf[i] = '\0';
 545                                 printd("returning %d after %d: %s\n", ret, i, buf);
 546                                 return (0);
 547                         }
 548                 }
 549         }
 550         return (0);
 551 }
 552
 553 int
 554 carrier(void)
 555 {
 556         int comstate;
 557
 558         if (ioctl(fd, TIOCMGET, &comstate) < 0) {
 559                 syslog(LOG_ERR, "%s: ioctl (%s, TIOCMGET): %m",
 560                     username, devicename);
 561                 down(2);
 562         }
 563         return !!(comstate & TIOCM_CD);
 564 }
 565
 566 void
 567 down(int code)
 568 {
 569         if (fd > -1)
 570                 close(fd);
 571         if (pfd)
 572                 unlink(pidfile);
 573         if (uucp_lock && locked)
 574                 uu_unlock(dvname);
 575         exit(code);
 576 }
 577
 578 static void
 579 usage(void)
 580 {
 581         (void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
 582 "usage: startslip [-d] [-b speed] [-s string1 [-s string2 [...]]] [-h] [-l]",
 583 "                 [-L] [-A annexname] [-U upscript] [-D downscript]",
 584 "                 [-t script_timeout] [-W maxtries] [-w retry_pause]",
 585 "                 [-K keepalive] [-O outfill] [-S unit] device user passwd");
 586         exit(1);
 587 }