pppd/sys-sunos4.c

   1 /*
   2  * System-dependent procedures for pppd under SunOS 4.
   3  *
   4  * Copyright (c) 1994 The Australian National University.
   5  * All rights reserved.
   6  *
   7  * Permission to use, copy, modify, and distribute this software and its
   8  * documentation is hereby granted, provided that the above copyright
   9  * notice appears in all copies.  This software is provided without any
  10  * warranty, express or implied. The Australian National University
  11  * makes no representations about the suitability of this software for
  12  * any purpose.
  13  *
  14  * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
  15  * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  16  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
  17  * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
  18  * OF SUCH DAMAGE.
  19  *
  20  * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
  21  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
  22  * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  23  * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
  24  * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
  25  * OR MODIFICATIONS.
  26  */
  27
  28 #ifndef lint
  29 static char rcsid[] = "$Id: sys-sunos4.c,v 1.9 1998/03/25 02:19:29 paulus Exp $";
  30 #endif
  31
  32 #include <stdio.h>
  33 #include <stddef.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include <ctype.h>
  37 #include <errno.h>
  38 #include <fcntl.h>
  39 #include <unistd.h>
  40 #include <termios.h>
  41 #include <signal.h>
  42 #include <malloc.h>
  43 #include <utmp.h>
  44 #include <sys/types.h>
  45 #include <sys/param.h>
  46 #include <sys/socket.h>
  47 #include <sys/sockio.h>
  48 #include <sys/stream.h>
  49 #include <sys/stropts.h>
  50 #include <sys/syslog.h>
  51 #include <sys/stat.h>
  52 #include <sys/time.h>
  53 #include <sys/poll.h>
  54 #include <net/if.h>
  55 #include <net/if_arp.h>
  56 #include <net/nit_if.h>
  57 #include <net/route.h>
  58 #include <net/ppp_defs.h>
  59 #include <net/pppio.h>
  60 #include <netinet/in.h>
  61
  62 #include "pppd.h"
  63
  64 #if defined(sun) && defined(sparc)
  65 #include <alloca.h>
  66 #ifndef __GNUC__
  67 extern void *alloca();
  68 #endif
  69 #endif /*sparc*/
  70
  71 static int      pppfd;
  72 static int      fdmuxid = -1;
  73 static int      iffd;
  74 static int      sockfd;
  75
  76 static int      restore_term;
  77 static struct termios inittermios;
  78 static struct winsize wsinfo;   /* Initial window size info */
  79 static pid_t    parent_pid;     /* PID of our parent */
  80
  81 extern u_char   inpacket_buf[]; /* borrowed from main.c */
  82
  83 static int      link_mtu, link_mru;
  84
  85 #define NMODULES        32
  86 static int      tty_nmodules;
  87 static char     tty_modules[NMODULES][FMNAMESZ+1];
  88
  89 static int      if_is_up;       /* Interface has been marked up */
  90 static u_int32_t ifaddrs[2];    /* local and remote addresses */
  91 static u_int32_t default_route_gateway; /* Gateway for default route added */
  92 static u_int32_t proxy_arp_addr;        /* Addr for proxy arp entry added */
  93
  94 /* Prototypes for procedures local to this file. */
  95 static int translate_speed __P((int));
  96 static int baud_rate_of __P((int));
  97 static int get_ether_addr __P((u_int32_t, struct sockaddr *));
  98 static int strioctl __P((int, int, void *, int, int));
  99
 100
 101 /*
 102  * sys_init - System-dependent initialization.
 103  */
 104 void
 105 sys_init()
 106 {
 107     int x;
 108
 109     /* Get an internet socket for doing socket ioctl's on. */
 110     if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
 111         syslog(LOG_ERR, "Couldn't create IP socket: %m");
 112         die(1);
 113     }
 114
 115     /*
 116      * We may want to send a SIGHUP to the session leader associated
 117      * with our controlling terminal later.  Because SunOS doesn't
 118      * have getsid(), we make do with sending the signal to our
 119      * parent process.
 120      */
 121     parent_pid = getppid();
 122
 123     /*
 124      * Open the ppp device.
 125      */
 126     pppfd = open("/dev/ppp", O_RDWR | O_NONBLOCK, 0);
 127     if (pppfd < 0) {
 128         syslog(LOG_ERR, "Can't open /dev/ppp: %m");
 129         die(1);
 130     }
 131     if (kdebugflag) {
 132         x = PPPDBG_LOG + PPPDBG_DRIVER;
 133         strioctl(pppfd, PPPIO_DEBUG, &x, sizeof(int), 0);
 134     }
 135
 136     /* Assign a new PPA and get its unit number. */
 137     if (strioctl(pppfd, PPPIO_NEWPPA, &ifunit, 0, sizeof(int)) < 0) {
 138         syslog(LOG_ERR, "Can't create new PPP interface: %m");
 139         die(1);
 140     }
 141
 142     /*
 143      * Open the ppp device again and push the if_ppp module on it.
 144      */
 145     iffd = open("/dev/ppp", O_RDWR, 0);
 146     if (iffd < 0) {
 147         syslog(LOG_ERR, "Can't open /dev/ppp (2): %m");
 148         die(1);
 149     }
 150     if (kdebugflag) {
 151         x = PPPDBG_LOG + PPPDBG_DRIVER;
 152         strioctl(iffd, PPPIO_DEBUG, &x, sizeof(int), 0);
 153     }
 154     if (strioctl(iffd, PPPIO_ATTACH, &ifunit, sizeof(int), 0) < 0) {
 155         syslog(LOG_ERR, "Couldn't attach ppp interface to device: %m");
 156         die(1);
 157     }
 158     if (ioctl(iffd, I_PUSH, "if_ppp") < 0) {
 159         syslog(LOG_ERR, "Can't push ppp interface module: %m");
 160         die(1);
 161     }
 162     if (kdebugflag) {
 163         x = PPPDBG_LOG + PPPDBG_IF;
 164         strioctl(iffd, PPPIO_DEBUG, &x, sizeof(int), 0);
 165     }
 166     if (strioctl(iffd, PPPIO_NEWPPA, &ifunit, sizeof(int), 0) < 0) {
 167         syslog(LOG_ERR, "Couldn't create ppp interface unit: %m");
 168         die(1);
 169     }
 170     x = PPP_IP;
 171     if (strioctl(iffd, PPPIO_BIND, &x, sizeof(int), 0) < 0) {
 172         syslog(LOG_ERR, "Couldn't bind ppp interface to IP SAP: %m");
 173         die(1);
 174     }
 175 }
 176
 177 /*
 178  * sys_cleanup - restore any system state we modified before exiting:
 179  * mark the interface down, delete default route and/or proxy arp entry.
 180  * This shouldn't call die() because it's called from die().
 181  */
 182 void
 183 sys_cleanup()
 184 {
 185     if (if_is_up)
 186         sifdown(0);
 187     if (ifaddrs[0])
 188         cifaddr(0, ifaddrs[0], ifaddrs[1]);
 189     if (default_route_gateway)
 190         cifdefaultroute(0, 0, default_route_gateway);
 191     if (proxy_arp_addr)
 192         cifproxyarp(0, proxy_arp_addr);
 193 }
 194
 195 /*
 196  * sys_close - Clean up in a child process before execing.
 197  */
 198 void
 199 sys_close()
 200 {
 201     close(iffd);
 202     close(pppfd);
 203     close(sockfd);
 204 }
 205
 206 /*
 207  * sys_check_options - check the options that the user specified
 208  */
 209 void
 210 sys_check_options()
 211 {
 212 }
 213
 214
 215 /*
 216  * daemon - Detach us from controlling terminal session.
 217  */
 218 int
 219 daemon(nochdir, noclose)
 220     int nochdir, noclose;
 221 {
 222     int pid;
 223
 224     if ((pid = fork()) < 0)
 225         return -1;
 226     if (pid != 0)
 227         exit(0);                /* parent dies */
 228     setsid();
 229     if (!nochdir)
 230         chdir("/");
 231     if (!noclose) {
 232         fclose(stdin);          /* don't need stdin, stdout, stderr */
 233         fclose(stdout);
 234         fclose(stderr);
 235     }
 236     return 0;
 237 }
 238
 239 /*
 240  * ppp_available - check whether the system has any ppp interfaces
 241  */
 242 int
 243 ppp_available()
 244 {
 245     struct stat buf;
 246
 247     return stat("/dev/ppp", &buf) >= 0;
 248 }
 249
 250 /*
 251  * establish_ppp - Turn the serial port into a ppp interface.
 252  */
 253 void
 254 establish_ppp(fd)
 255     int fd;
 256 {
 257     int i;
 258
 259     /* Pop any existing modules off the tty stream. */
 260     for (i = 0;; ++i)
 261         if (ioctl(fd, I_LOOK, tty_modules[i]) < 0
 262             || ioctl(fd, I_POP, 0) < 0)
 263             break;
 264     tty_nmodules = i;
 265
 266     /* Push the async hdlc module and the compressor module. */
 267     if (ioctl(fd, I_PUSH, "ppp_ahdl") < 0) {
 268         syslog(LOG_ERR, "Couldn't push PPP Async HDLC module: %m");
 269         die(1);
 270     }
 271     if (ioctl(fd, I_PUSH, "ppp_comp") < 0) {
 272         syslog(LOG_ERR, "Couldn't push PPP compression module: %m");
 273 /*      die(1); */
 274     }
 275
 276     /* Link the serial port under the PPP multiplexor. */
 277     if ((fdmuxid = ioctl(pppfd, I_LINK, fd)) < 0) {
 278         syslog(LOG_ERR, "Can't link tty to PPP mux: %m");
 279         die(1);
 280     }
 281 }
 282
 283 /*
 284  * restore_loop - reattach the ppp unit to the loopback.
 285  * This doesn't need to do anything because disestablish_ppp does it.
 286  */
 287 void
 288 restore_loop()
 289 {
 290 }
 291
 292 /*
 293  * disestablish_ppp - Restore the serial port to normal operation.
 294  * It attempts to reconstruct the stream with the previously popped
 295  * modules.  This shouldn't call die() because it's called from die().
 296  */
 297 void
 298 disestablish_ppp(fd)
 299     int fd;
 300 {
 301     int i;
 302
 303     if (fdmuxid >= 0) {
 304         if (ioctl(pppfd, I_UNLINK, fdmuxid) < 0) {
 305             if (!hungup)
 306                 syslog(LOG_ERR, "Can't unlink tty from PPP mux: %m");
 307         }
 308         fdmuxid = -1;
 309
 310         if (!hungup) {
 311             while (ioctl(fd, I_POP, 0) >= 0)
 312                 ;
 313             for (i = tty_nmodules - 1; i >= 0; --i)
 314                 if (ioctl(fd, I_PUSH, tty_modules[i]) < 0)
 315                     syslog(LOG_ERR, "Couldn't restore tty module %s: %m",
 316                            tty_modules[i]);
 317         }
 318         if (hungup && default_device && parent_pid > 0) {
 319             /*
 320              * If we have received a hangup, we need to send a SIGHUP
 321              * to the terminal's controlling process.  The reason is
 322              * that the original stream head for the terminal hasn't
 323              * seen the M_HANGUP message (it went up through the ppp
 324              * driver to the stream head for our fd to /dev/ppp).
 325              * Actually we send the signal to the process that invoked
 326              * pppd, since SunOS doesn't have getsid().
 327              */
 328             kill(parent_pid, SIGHUP);
 329         }
 330     }
 331 }
 332
 333 /*
 334  * Check whether the link seems not to be 8-bit clean.
 335  */
 336 void
 337 clean_check()
 338 {
 339     int x;
 340     char *s;
 341
 342     if (strioctl(pppfd, PPPIO_GCLEAN, &x, 0, sizeof(x)) < 0)
 343         return;
 344     s = NULL;
 345     switch (~x) {
 346     case RCV_B7_0:
 347         s = "bit 7 set to 1";
 348         break;
 349     case RCV_B7_1:
 350         s = "bit 7 set to 0";
 351         break;
 352     case RCV_EVNP:
 353         s = "odd parity";
 354         break;
 355     case RCV_ODDP:
 356         s = "even parity";
 357         break;
 358     }
 359     if (s != NULL) {
 360         syslog(LOG_WARNING, "Serial link is not 8-bit clean:");
 361         syslog(LOG_WARNING, "All received characters had %s", s);
 362     }
 363 }
 364
 365 /*
 366  * List of valid speeds.
 367  */
 368 struct speed {
 369     int speed_int, speed_val;
 370 } speeds[] = {
 371 #ifdef B50
 372     { 50, B50 },
 373 #endif
 374 #ifdef B75
 375     { 75, B75 },
 376 #endif
 377 #ifdef B110
 378     { 110, B110 },
 379 #endif
 380 #ifdef B134
 381     { 134, B134 },
 382 #endif
 383 #ifdef B150
 384     { 150, B150 },
 385 #endif
 386 #ifdef B200
 387     { 200, B200 },
 388 #endif
 389 #ifdef B300
 390     { 300, B300 },
 391 #endif
 392 #ifdef B600
 393     { 600, B600 },
 394 #endif
 395 #ifdef B1200
 396     { 1200, B1200 },
 397 #endif
 398 #ifdef B1800
 399     { 1800, B1800 },
 400 #endif
 401 #ifdef B2000
 402     { 2000, B2000 },
 403 #endif
 404 #ifdef B2400
 405     { 2400, B2400 },
 406 #endif
 407 #ifdef B3600
 408     { 3600, B3600 },
 409 #endif
 410 #ifdef B4800
 411     { 4800, B4800 },
 412 #endif
 413 #ifdef B7200
 414     { 7200, B7200 },
 415 #endif
 416 #ifdef B9600
 417     { 9600, B9600 },
 418 #endif
 419 #ifdef B19200
 420     { 19200, B19200 },
 421 #endif
 422 #ifdef B38400
 423     { 38400, B38400 },
 424 #endif
 425 #ifdef EXTA
 426     { 19200, EXTA },
 427 #endif
 428 #ifdef EXTB
 429     { 38400, EXTB },
 430 #endif
 431 #ifdef B57600
 432     { 57600, B57600 },
 433 #endif
 434 #ifdef B115200
 435     { 115200, B115200 },
 436 #endif
 437     { 0, 0 }
 438 };
 439
 440 /*
 441  * Translate from bits/second to a speed_t.
 442  */
 443 static int
 444 translate_speed(bps)
 445     int bps;
 446 {
 447     struct speed *speedp;
 448
 449     if (bps == 0)
 450         return 0;
 451     for (speedp = speeds; speedp->speed_int; speedp++)
 452         if (bps == speedp->speed_int)
 453             return speedp->speed_val;
 454     syslog(LOG_WARNING, "speed %d not supported", bps);
 455     return 0;
 456 }
 457
 458 /*
 459  * Translate from a speed_t to bits/second.
 460  */
 461 static int
 462 baud_rate_of(speed)
 463     int speed;
 464 {
 465     struct speed *speedp;
 466
 467     if (speed == 0)
 468         return 0;
 469     for (speedp = speeds; speedp->speed_int; speedp++)
 470         if (speed == speedp->speed_val)
 471             return speedp->speed_int;
 472     return 0;
 473 }
 474
 475 /*
 476  * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
 477  * at the requested speed, etc.  If `local' is true, set CLOCAL
 478  * regardless of whether the modem option was specified.
 479  */
 480 void
 481 set_up_tty(fd, local)
 482     int fd, local;
 483 {
 484     int speed;
 485     struct termios tios;
 486
 487     if (tcgetattr(fd, &tios) < 0) {
 488         syslog(LOG_ERR, "tcgetattr: %m");
 489         die(1);
 490     }
 491
 492     if (!restore_term) {
 493         inittermios = tios;
 494         ioctl(fd, TIOCGWINSZ, &wsinfo);
 495     }
 496
 497     tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
 498     if (crtscts > 0)
 499         tios.c_cflag |= CRTSCTS;
 500     else if (crtscts < 0)
 501         tios.c_cflag &= ~CRTSCTS;
 502
 503     tios.c_cflag |= CS8 | CREAD | HUPCL;
 504     if (local || !modem)
 505         tios.c_cflag |= CLOCAL;
 506     tios.c_iflag = IGNBRK | IGNPAR;
 507     tios.c_oflag = 0;
 508     tios.c_lflag = 0;
 509     tios.c_cc[VMIN] = 1;
 510     tios.c_cc[VTIME] = 0;
 511
 512     if (crtscts == -2) {
 513         tios.c_iflag |= IXON | IXOFF;
 514         tios.c_cc[VSTOP] = 0x13;        /* DC3 = XOFF = ^S */
 515         tios.c_cc[VSTART] = 0x11;       /* DC1 = XON  = ^Q */
 516     }
 517
 518     speed = translate_speed(inspeed);
 519     if (speed) {
 520         cfsetospeed(&tios, speed);
 521         cfsetispeed(&tios, speed);
 522     } else {
 523         speed = cfgetospeed(&tios);
 524         /*
 525          * We can't proceed if the serial port speed is 0,
 526          * since that implies that the serial port is disabled.
 527          */
 528         if (speed == B0) {
 529             syslog(LOG_ERR, "Baud rate for %s is 0; need explicit baud rate",
 530                    devnam);
 531             die(1);
 532         }
 533     }
 534
 535     if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
 536         syslog(LOG_ERR, "tcsetattr: %m");
 537         die(1);
 538     }
 539
 540     baud_rate = inspeed = baud_rate_of(speed);
 541     restore_term = 1;
 542 }
 543
 544 /*
 545  * restore_tty - restore the terminal to the saved settings.
 546  */
 547 void
 548 restore_tty(fd)
 549     int fd;
 550 {
 551     if (restore_term) {
 552         if (!default_device) {
 553             /*
 554              * Turn off echoing, because otherwise we can get into
 555              * a loop with the tty and the modem echoing to each other.
 556              * We presume we are the sole user of this tty device, so
 557              * when we close it, it will revert to its defaults anyway.
 558              */
 559             inittermios.c_lflag &= ~(ECHO | ECHONL);
 560         }
 561         if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
 562             if (!hungup && errno != ENXIO)
 563                 syslog(LOG_WARNING, "tcsetattr: %m");
 564         ioctl(fd, TIOCSWINSZ, &wsinfo);
 565         restore_term = 0;
 566     }
 567 }
 568
 569 /*
 570  * setdtr - control the DTR line on the serial port.
 571  * This is called from die(), so it shouldn't call die().
 572  */
 573 void
 574 setdtr(fd, on)
 575 int fd, on;
 576 {
 577     int modembits = TIOCM_DTR;
 578
 579     ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
 580 }
 581
 582 /*
 583  * open_loopback - open the device we use for getting packets
 584  * in demand mode.  Under Solaris 2, we use our existing fd
 585  * to the ppp driver.
 586  */
 587 void
 588 open_ppp_loopback()
 589 {
 590 }
 591
 592 /*
 593  * output - Output PPP packet.
 594  */
 595 void
 596 output(unit, p, len)
 597     int unit;
 598     u_char *p;
 599     int len;
 600 {
 601     struct strbuf data;
 602     int retries;
 603     struct pollfd pfd;
 604
 605     if (debug)
 606         log_packet(p, len, "sent ", LOG_DEBUG);
 607
 608     data.len = len;
 609     data.buf = (caddr_t) p;
 610     retries = 4;
 611     while (putmsg(pppfd, NULL, &data, 0) < 0) {
 612         if (--retries < 0 || (errno != EWOULDBLOCK && errno != EAGAIN)) {
 613             if (errno != ENXIO)
 614                 syslog(LOG_ERR, "Couldn't send packet: %m");
 615             break;
 616         }
 617         pfd.fd = pppfd;
 618         pfd.events = POLLOUT;
 619         poll(&pfd, 1, 250);     /* wait for up to 0.25 seconds */
 620     }
 621 }
 622
 623
 624 /*
 625  * wait_input - wait until there is data available on fd,
 626  * for the length of time specified by *timo (indefinite
 627  * if timo is NULL).
 628  */
 629 void
 630 wait_input(timo)
 631     struct timeval *timo;
 632 {
 633     int t;
 634     struct pollfd pfd;
 635
 636     t = timo == NULL? -1: timo->tv_sec * 1000 + timo->tv_usec / 1000;
 637     pfd.fd = pppfd;
 638     pfd.events = POLLIN | POLLPRI | POLLHUP;
 639     if (poll(&pfd, 1, t) < 0 && errno != EINTR) {
 640         syslog(LOG_ERR, "poll: %m");
 641         die(1);
 642     }
 643 }
 644
 645 /*
 646  * wait_loop_output - wait until there is data available on the
 647  * loopback, for the length of time specified by *timo (indefinite
 648  * if timo is NULL).
 649  */
 650 void
 651 wait_loop_output(timo)
 652     struct timeval *timo;
 653 {
 654     wait_input(timo);
 655 }
 656
 657 /*
 658  * wait_time - wait for a given length of time or until a
 659  * signal is received.
 660  */
 661 void
 662 wait_time(timo)
 663     struct timeval *timo;
 664 {
 665     int n;
 666
 667     n = select(0, NULL, NULL, NULL, timo);
 668     if (n < 0 && errno != EINTR) {
 669         syslog(LOG_ERR, "select: %m");
 670         die(1);
 671     }
 672 }
 673
 674
 675 /*
 676  * read_packet - get a PPP packet from the serial device.
 677  */
 678 int
 679 read_packet(buf)
 680     u_char *buf;
 681 {
 682     struct strbuf ctrl, data;
 683     int flags, len;
 684     unsigned char ctrlbuf[64];
 685
 686     for (;;) {
 687         data.maxlen = PPP_MRU + PPP_HDRLEN;
 688         data.buf = (caddr_t) buf;
 689         ctrl.maxlen = sizeof(ctrlbuf);
 690         ctrl.buf = (caddr_t) ctrlbuf;
 691         flags = 0;
 692         len = getmsg(pppfd, &ctrl, &data, &flags);
 693         if (len < 0) {
 694             if (errno = EAGAIN || errno == EINTR)
 695                 return -1;
 696             syslog(LOG_ERR, "Error reading packet: %m");
 697             die(1);
 698         }
 699
 700         if (ctrl.len <= 0)
 701             return data.len;
 702
 703         /*
 704          * Got a M_PROTO or M_PCPROTO message.  Huh?
 705          */
 706         if (debug)
 707             syslog(LOG_DEBUG, "got ctrl msg len=%d", ctrl.len);
 708
 709     }
 710 }
 711
 712 /*
 713  * get_loop_output - get outgoing packets from the ppp device,
 714  * and detect when we want to bring the real link up.
 715  * Return value is 1 if we need to bring up the link, 0 otherwise.
 716  */
 717 int
 718 get_loop_output()
 719 {
 720     int len;
 721     int rv = 0;
 722
 723     while ((len = read_packet(inpacket_buf)) > 0) {
 724         if (loop_frame(inpacket_buf, len))
 725             rv = 1;
 726     }
 727     return rv;
 728 }
 729
 730 /*
 731  * ppp_send_config - configure the transmit characteristics of
 732  * the ppp interface.
 733  */
 734 void
 735 ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
 736     int unit, mtu;
 737     u_int32_t asyncmap;
 738     int pcomp, accomp;
 739 {
 740     int cf[2];
 741     struct ifreq ifr;
 742
 743     link_mtu = mtu;
 744     if (strioctl(pppfd, PPPIO_MTU, &mtu, sizeof(mtu), 0) < 0) {
 745         if (hungup && errno == ENXIO)
 746             return;
 747         syslog(LOG_ERR, "Couldn't set MTU: %m");
 748     }
 749     if (strioctl(pppfd, PPPIO_XACCM, &asyncmap, sizeof(asyncmap), 0) < 0) {
 750         syslog(LOG_ERR, "Couldn't set transmit ACCM: %m");
 751     }
 752     cf[0] = (pcomp? COMP_PROT: 0) + (accomp? COMP_AC: 0);
 753     cf[1] = COMP_PROT | COMP_AC;
 754     if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
 755         syslog(LOG_ERR, "Couldn't set prot/AC compression: %m");
 756     }
 757
 758     /* set mtu for ip as well */
 759     memset(&ifr, 0, sizeof(ifr));
 760     strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 761     ifr.ifr_metric = link_mtu;
 762     if (ioctl(sockfd, SIOCSIFMTU, &ifr) < 0) {
 763         syslog(LOG_ERR, "Couldn't set IP MTU: %m");
 764     }
 765 }
 766
 767 /*
 768  * ppp_set_xaccm - set the extended transmit ACCM for the interface.
 769  */
 770 void
 771 ppp_set_xaccm(unit, accm)
 772     int unit;
 773     ext_accm accm;
 774 {
 775     if (strioctl(pppfd, PPPIO_XACCM, accm, sizeof(ext_accm), 0) < 0) {
 776         if (!hungup || errno != ENXIO)
 777             syslog(LOG_WARNING, "Couldn't set extended ACCM: %m");
 778     }
 779 }
 780
 781 /*
 782  * ppp_recv_config - configure the receive-side characteristics of
 783  * the ppp interface.
 784  */
 785 void
 786 ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
 787     int unit, mru;
 788     u_int32_t asyncmap;
 789     int pcomp, accomp;
 790 {
 791     int cf[2];
 792
 793     link_mru = mru;
 794     if (strioctl(pppfd, PPPIO_MRU, &mru, sizeof(mru), 0) < 0) {
 795         if (hungup && errno == ENXIO)
 796             return;
 797         syslog(LOG_ERR, "Couldn't set MRU: %m");
 798     }
 799     if (strioctl(pppfd, PPPIO_RACCM, &asyncmap, sizeof(asyncmap), 0) < 0) {
 800         syslog(LOG_ERR, "Couldn't set receive ACCM: %m");
 801     }
 802     cf[0] = (pcomp? DECOMP_PROT: 0) + (accomp? DECOMP_AC: 0);
 803     cf[1] = DECOMP_PROT | DECOMP_AC;
 804     if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
 805         syslog(LOG_ERR, "Couldn't set prot/AC decompression: %m");
 806     }
 807 }
 808
 809 /*
 810  * ccp_test - ask kernel whether a given compression method
 811  * is acceptable for use.
 812  */
 813 int
 814 ccp_test(unit, opt_ptr, opt_len, for_transmit)
 815     int unit, opt_len, for_transmit;
 816     u_char *opt_ptr;
 817 {
 818     if (strioctl(pppfd, (for_transmit? PPPIO_XCOMP: PPPIO_RCOMP),
 819                  opt_ptr, opt_len, 0) >= 0)
 820         return 1;
 821     return (errno == ENOSR)? 0: -1;
 822 }
 823
 824 /*
 825  * ccp_flags_set - inform kernel about the current state of CCP.
 826  */
 827 void
 828 ccp_flags_set(unit, isopen, isup)
 829     int unit, isopen, isup;
 830 {
 831     int cf[2];
 832
 833     cf[0] = (isopen? CCP_ISOPEN: 0) + (isup? CCP_ISUP: 0);
 834     cf[1] = CCP_ISOPEN | CCP_ISUP | CCP_ERROR | CCP_FATALERROR;
 835     if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
 836         if (!hungup || errno != ENXIO)
 837             syslog(LOG_ERR, "Couldn't set kernel CCP state: %m");
 838     }
 839 }
 840
 841 /*
 842  * get_idle_time - return how long the link has been idle.
 843  */
 844 int
 845 get_idle_time(u, ip)
 846     int u;
 847     struct ppp_idle *ip;
 848 {
 849     return strioctl(pppfd, PPPIO_GIDLE, ip, 0, sizeof(struct ppp_idle)) >= 0;
 850 }
 851
 852
 853 /*
 854  * ccp_fatal_error - returns 1 if decompression was disabled as a
 855  * result of an error detected after decompression of a packet,
 856  * 0 otherwise.  This is necessary because of patent nonsense.
 857  */
 858 int
 859 ccp_fatal_error(unit)
 860     int unit;
 861 {
 862     int cf[2];
 863
 864     cf[0] = cf[1] = 0;
 865     if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
 866         if (errno != ENXIO && errno != EINVAL)
 867             syslog(LOG_ERR, "Couldn't get compression flags: %m");
 868         return 0;
 869     }
 870     return cf[0] & CCP_FATALERROR;
 871 }
 872
 873 /*
 874  * sifvjcomp - config tcp header compression
 875  */
 876 int
 877 sifvjcomp(u, vjcomp, xcidcomp, xmaxcid)
 878     int u, vjcomp, xcidcomp, xmaxcid;
 879 {
 880     int cf[2];
 881     char maxcid[2];
 882
 883     if (vjcomp) {
 884         maxcid[0] = xcidcomp;
 885         maxcid[1] = 15;         /* XXX should be rmaxcid */
 886         if (strioctl(pppfd, PPPIO_VJINIT, maxcid, sizeof(maxcid), 0) < 0) {
 887             syslog(LOG_ERR, "Couldn't initialize VJ compression: %m");
 888         }
 889     }
 890
 891     cf[0] = (vjcomp? COMP_VJC + DECOMP_VJC: 0)  /* XXX this is wrong */
 892         + (xcidcomp? COMP_VJCCID + DECOMP_VJCCID: 0);
 893     cf[1] = COMP_VJC + DECOMP_VJC + COMP_VJCCID + DECOMP_VJCCID;
 894     if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
 895         if (vjcomp)
 896             syslog(LOG_ERR, "Couldn't enable VJ compression: %m");
 897     }
 898
 899     return 1;
 900 }
 901
 902 /*
 903  * sifup - Config the interface up and enable IP packets to pass.
 904  */
 905 int
 906 sifup(u)
 907     int u;
 908 {
 909     struct ifreq ifr;
 910
 911     strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 912     if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
 913         syslog(LOG_ERR, "Couldn't mark interface up (get): %m");
 914         return 0;
 915     }
 916     ifr.ifr_flags |= IFF_UP;
 917     if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
 918         syslog(LOG_ERR, "Couldn't mark interface up (set): %m");
 919         return 0;
 920     }
 921     if_is_up = 1;
 922     return 1;
 923 }
 924
 925 /*
 926  * sifdown - Config the interface down and disable IP.
 927  */
 928 int
 929 sifdown(u)
 930     int u;
 931 {
 932     struct ifreq ifr;
 933
 934     strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 935     if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
 936         syslog(LOG_ERR, "Couldn't mark interface down (get): %m");
 937         return 0;
 938     }
 939     if ((ifr.ifr_flags & IFF_UP) != 0) {
 940         ifr.ifr_flags &= ~IFF_UP;
 941         if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
 942             syslog(LOG_ERR, "Couldn't mark interface down (set): %m");
 943             return 0;
 944         }
 945     }
 946     if_is_up = 0;
 947     return 1;
 948 }
 949
 950 /*
 951  * sifnpmode - Set the mode for handling packets for a given NP.
 952  */
 953 int
 954 sifnpmode(u, proto, mode)
 955     int u;
 956     int proto;
 957     enum NPmode mode;
 958 {
 959     int npi[2];
 960
 961     npi[0] = proto;
 962     npi[1] = (int) mode;
 963     if (strioctl(pppfd, PPPIO_NPMODE, npi, 2 * sizeof(int), 0) < 0) {
 964         syslog(LOG_ERR, "ioctl(set NP %d mode to %d): %m", proto, mode);
 965         return 0;
 966     }
 967     return 1;
 968 }
 969
 970 #define INET_ADDR(x)    (((struct sockaddr_in *) &(x))->sin_addr.s_addr)
 971
 972 /*
 973  * sifaddr - Config the interface IP addresses and netmask.
 974  */
 975 int
 976 sifaddr(u, o, h, m)
 977     int u;
 978     u_int32_t o, h, m;
 979 {
 980     struct ifreq ifr;
 981
 982     memset(&ifr, 0, sizeof(ifr));
 983     strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 984     ifr.ifr_addr.sa_family = AF_INET;
 985     INET_ADDR(ifr.ifr_addr) = m;
 986     if (ioctl(sockfd, SIOCSIFNETMASK, &ifr) < 0) {
 987         syslog(LOG_ERR, "Couldn't set IP netmask: %m");
 988     }
 989     ifr.ifr_addr.sa_family = AF_INET;
 990     INET_ADDR(ifr.ifr_addr) = o;
 991     if (ioctl(sockfd, SIOCSIFADDR, &ifr) < 0) {
 992         syslog(LOG_ERR, "Couldn't set local IP address: %m");
 993     }
 994     ifr.ifr_dstaddr.sa_family = AF_INET;
 995     INET_ADDR(ifr.ifr_dstaddr) = h;
 996     if (ioctl(sockfd, SIOCSIFDSTADDR, &ifr) < 0) {
 997         syslog(LOG_ERR, "Couldn't set remote IP address: %m");
 998     }
 999 #if 0   /* now done in ppp_send_config */
1000     ifr.ifr_metric = link_mtu;
1001     if (ioctl(sockfd, SIOCSIFMTU, &ifr) < 0) {
1002         syslog(LOG_ERR, "Couldn't set IP MTU: %m");
1003     }
1004 #endif
1005     ifaddrs[0] = o;
1006     ifaddrs[1] = h;
1007
1008     return 1;
1009 }
1010
1011 /*
1012  * cifaddr - Clear the interface IP addresses, and delete routes
1013  * through the interface if possible.
1014  */
1015 int
1016 cifaddr(u, o, h)
1017     int u;
1018     u_int32_t o, h;
1019 {
1020     struct rtentry rt;
1021
1022     bzero(&rt, sizeof(rt));
1023     rt.rt_dst.sa_family = AF_INET;
1024     INET_ADDR(rt.rt_dst) = h;
1025     rt.rt_gateway.sa_family = AF_INET;
1026     INET_ADDR(rt.rt_gateway) = o;
1027     rt.rt_flags = RTF_HOST;
1028     if (ioctl(sockfd, SIOCDELRT, &rt) < 0)
1029         syslog(LOG_ERR, "Couldn't delete route through interface: %m");
1030     ifaddrs[0] = 0;
1031     return 1;
1032 }
1033
1034 /*
1035  * sifdefaultroute - assign a default route through the address given.
1036  */
1037 int
1038 sifdefaultroute(u, l, g)
1039     int u;
1040     u_int32_t l, g;
1041 {
1042     struct rtentry rt;
1043
1044     bzero(&rt, sizeof(rt));
1045     rt.rt_dst.sa_family = AF_INET;
1046     INET_ADDR(rt.rt_dst) = 0;
1047     rt.rt_gateway.sa_family = AF_INET;
1048     INET_ADDR(rt.rt_gateway) = g;
1049     rt.rt_flags = RTF_GATEWAY;
1050
1051     if (ioctl(sockfd, SIOCADDRT, &rt) < 0) {
1052         syslog(LOG_ERR, "Can't add default route: %m");
1053         return 0;
1054     }
1055
1056     default_route_gateway = g;
1057     return 1;
1058 }
1059
1060 /*
1061  * cifdefaultroute - delete a default route through the address given.
1062  */
1063 int
1064 cifdefaultroute(u, l, g)
1065     int u;
1066     u_int32_t l, g;
1067 {
1068     struct rtentry rt;
1069
1070     bzero(&rt, sizeof(rt));
1071     rt.rt_dst.sa_family = AF_INET;
1072     INET_ADDR(rt.rt_dst) = 0;
1073     rt.rt_gateway.sa_family = AF_INET;
1074     INET_ADDR(rt.rt_gateway) = g;
1075     rt.rt_flags = RTF_GATEWAY;
1076
1077     if (ioctl(sockfd, SIOCDELRT, &rt) < 0) {
1078         syslog(LOG_ERR, "Can't delete default route: %m");
1079         return 0;
1080     }
1081
1082     default_route_gateway = 0;
1083     return 1;
1084 }
1085
1086 /*
1087  * sifproxyarp - Make a proxy ARP entry for the peer.
1088  */
1089 int
1090 sifproxyarp(unit, hisaddr)
1091     int unit;
1092     u_int32_t hisaddr;
1093 {
1094     struct arpreq arpreq;
1095
1096     bzero(&arpreq, sizeof(arpreq));
1097     if (!get_ether_addr(hisaddr, &arpreq.arp_ha))
1098         return 0;
1099
1100     arpreq.arp_pa.sa_family = AF_INET;
1101     INET_ADDR(arpreq.arp_pa) = hisaddr;
1102     arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1103     if (ioctl(sockfd, SIOCSARP, (caddr_t) &arpreq) < 0) {
1104         syslog(LOG_ERR, "Couldn't set proxy ARP entry: %m");
1105         return 0;
1106     }
1107
1108     proxy_arp_addr = hisaddr;
1109     return 1;
1110 }
1111
1112 /*
1113  * cifproxyarp - Delete the proxy ARP entry for the peer.
1114  */
1115 int
1116 cifproxyarp(unit, hisaddr)
1117     int unit;
1118     u_int32_t hisaddr;
1119 {
1120     struct arpreq arpreq;
1121
1122     bzero(&arpreq, sizeof(arpreq));
1123     arpreq.arp_pa.sa_family = AF_INET;
1124     INET_ADDR(arpreq.arp_pa) = hisaddr;
1125     if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) {
1126         syslog(LOG_ERR, "Couldn't delete proxy ARP entry: %m");
1127         return 0;
1128     }
1129
1130     proxy_arp_addr = 0;
1131     return 1;
1132 }
1133
1134 /*
1135  * get_ether_addr - get the hardware address of an interface on the
1136  * the same subnet as ipaddr.
1137  */
1138 #define MAX_IFS         32
1139
1140 static int
1141 get_ether_addr(ipaddr, hwaddr)
1142     u_int32_t ipaddr;
1143     struct sockaddr *hwaddr;
1144 {
1145     struct ifreq *ifr, *ifend;
1146     u_int32_t ina, mask;
1147     struct ifreq ifreq;
1148     struct ifconf ifc;
1149     struct ifreq ifs[MAX_IFS];
1150     int nit_fd;
1151
1152     ifc.ifc_len = sizeof(ifs);
1153     ifc.ifc_req = ifs;
1154     if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1155         syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m");
1156         return 0;
1157     }
1158
1159     /*
1160      * Scan through looking for an interface with an Internet
1161      * address on the same subnet as `ipaddr'.
1162      */
1163     ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1164     for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
1165             ((char *)&ifr->ifr_addr + sizeof(struct sockaddr))) {
1166         if (ifr->ifr_addr.sa_family == AF_INET) {
1167
1168             /*
1169              * Check that the interface is up, and not point-to-point
1170              * or loopback.
1171              */
1172             strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1173             if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1174                 continue;
1175             if ((ifreq.ifr_flags &
1176                  (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
1177                  != (IFF_UP|IFF_BROADCAST))
1178                 continue;
1179
1180             /*
1181              * Get its netmask and check that it's on the right subnet.
1182              */
1183             if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1184                 continue;
1185             ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1186             mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
1187             if ((ipaddr & mask) != (ina & mask))
1188                 continue;
1189
1190             break;
1191         }
1192     }
1193
1194     if (ifr >= ifend)
1195         return 0;
1196     syslog(LOG_INFO, "found interface %s for proxy arp", ifr->ifr_name);
1197
1198     /*
1199      * Grab the physical address for this interface.
1200      */
1201     if ((nit_fd = open("/dev/nit", O_RDONLY)) < 0) {
1202         syslog(LOG_ERR, "Couldn't open /dev/nit: %m");
1203         return 0;
1204     }
1205     strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1206     if (ioctl(nit_fd, NIOCBIND, &ifreq) < 0
1207         || ioctl(nit_fd, SIOCGIFADDR, &ifreq) < 0) {
1208         syslog(LOG_ERR, "Couldn't get hardware address for %s: %m",
1209                ifreq.ifr_name);
1210         close(nit_fd);
1211         return 0;
1212     }
1213
1214     hwaddr->sa_family = AF_UNSPEC;
1215     memcpy(hwaddr->sa_data, ifreq.ifr_addr.sa_data, 6);
1216     close(nit_fd);
1217     return 1;
1218 }
1219
1220 #define WTMPFILE        "/usr/adm/wtmp"
1221
1222 void
1223 logwtmp(line, name, host)
1224     const char *line, *name, *host;
1225 {
1226     int fd;
1227     struct stat buf;
1228     struct utmp ut;
1229
1230     if ((fd = open(WTMPFILE, O_WRONLY|O_APPEND, 0)) < 0)
1231         return;
1232     if (!fstat(fd, &buf)) {
1233         (void)strncpy(ut.ut_line, line, sizeof(ut.ut_line));
1234         (void)strncpy(ut.ut_name, name, sizeof(ut.ut_name));
1235         (void)strncpy(ut.ut_host, host, sizeof(ut.ut_host));
1236         (void)time(&ut.ut_time);
1237         if (write(fd, (char *)&ut, sizeof(struct utmp)) != sizeof(struct utmp))
1238             (void)ftruncate(fd, buf.st_size);
1239     }
1240     close(fd);
1241 }
1242
1243 /*
1244  * Return user specified netmask, modified by any mask we might determine
1245  * for address `addr' (in network byte order).
1246  * Here we scan through the system's list of interfaces, looking for
1247  * any non-point-to-point interfaces which might appear to be on the same
1248  * network as `addr'.  If we find any, we OR in their netmask to the
1249  * user-specified netmask.
1250  */
1251 u_int32_t
1252 GetMask(addr)
1253     u_int32_t addr;
1254 {
1255     u_int32_t mask, nmask, ina;
1256     struct ifreq *ifr, *ifend, ifreq;
1257     struct ifconf ifc;
1258
1259     addr = ntohl(addr);
1260     if (IN_CLASSA(addr))        /* determine network mask for address class */
1261         nmask = IN_CLASSA_NET;
1262     else if (IN_CLASSB(addr))
1263         nmask = IN_CLASSB_NET;
1264     else
1265         nmask = IN_CLASSC_NET;
1266     /* class D nets are disallowed by bad_ip_adrs */
1267     mask = netmask | htonl(nmask);
1268
1269     /*
1270      * Scan through the system's network interfaces.
1271      */
1272     ifc.ifc_len = MAX_IFS * sizeof(struct ifreq);
1273     ifc.ifc_req = alloca(ifc.ifc_len);
1274     if (ifc.ifc_req == 0)
1275         return mask;
1276     if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1277         syslog(LOG_WARNING, "Couldn't get system interface list: %m");
1278         return mask;
1279     }
1280     ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1281     for (ifr = ifc.ifc_req; ifr < ifend; ++ifr) {
1282         /*
1283          * Check the interface's internet address.
1284          */
1285         if (ifr->ifr_addr.sa_family != AF_INET)
1286             continue;
1287         ina = INET_ADDR(ifr->ifr_addr);
1288         if ((ntohl(ina) & nmask) != (addr & nmask))
1289             continue;
1290         /*
1291          * Check that the interface is up, and not point-to-point or loopback.
1292          */
1293         strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1294         if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1295             continue;
1296         if ((ifreq.ifr_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK))
1297             != IFF_UP)
1298             continue;
1299         /*
1300          * Get its netmask and OR it into our mask.
1301          */
1302         if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1303             continue;
1304         mask |= INET_ADDR(ifreq.ifr_addr);
1305     }
1306
1307     return mask;
1308 }
1309
1310 static int
1311 strioctl(fd, cmd, ptr, ilen, olen)
1312     int fd, cmd, ilen, olen;
1313     void *ptr;
1314 {
1315     struct strioctl str;
1316
1317     str.ic_cmd = cmd;
1318     str.ic_timout = 0;
1319     str.ic_len = ilen;
1320     str.ic_dp = ptr;
1321     if (ioctl(fd, I_STR, &str) == -1)
1322         return -1;
1323     if (str.ic_len != olen)
1324         syslog(LOG_DEBUG, "strioctl: expected %d bytes, got %d for cmd %x\n",
1325                olen, str.ic_len, cmd);
1326     return 0;
1327 }
1328
1329 /*
1330  * Use the hostid as part of the random number seed.
1331  */
1332 int
1333 get_host_seed()
1334 {
1335     return gethostid();
1336 }
1337
1338 /*
1339  * Code for locking/unlocking the serial device.
1340  * This code is derived from chat.c.
1341  */
1342
1343 #if !defined(HDB) && !defined(SUNOS3)
1344 #define HDB     1               /* ascii lock files are the default */
1345 #endif
1346
1347 #ifndef LOCK_DIR
1348 # if HDB
1349 #  define       PIDSTRING
1350 #  define       LOCK_PREFIX     "/usr/spool/locks/LCK.."
1351 # else /* HDB */
1352 #  define       LOCK_PREFIX     "/usr/spool/uucp/LCK.."
1353 # endif /* HDB */
1354 #endif /* LOCK_DIR */
1355
1356 static char *lock_file;         /* name of lock file created */
1357
1358 /*
1359  * lock - create a lock file for the named device.
1360  */
1361 int
1362 lock(dev)
1363     char *dev;
1364 {
1365     char hdb_lock_buffer[12];
1366     int fd, pid, n;
1367     char *p;
1368
1369     if ((p = strrchr(dev, '/')) != NULL)
1370         dev = p + 1;
1371     lock_file = malloc(strlen(LOCK_PREFIX) + strlen(dev) + 1);
1372     if (lock_file == NULL)
1373         novm("lock file name");
1374     strcat(strcpy(lock_file, LOCK_PREFIX), dev);
1375
1376     while ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0) {
1377         if (errno == EEXIST
1378             && (fd = open(lock_file, O_RDONLY, 0)) >= 0) {
1379             /* Read the lock file to find out who has the device locked */
1380 #ifdef PIDSTRING
1381             n = read(fd, hdb_lock_buffer, 11);
1382             if (n > 0) {
1383                 hdb_lock_buffer[n] = 0;
1384                 pid = atoi(hdb_lock_buffer);
1385             }
1386 #else
1387             n = read(fd, &pid, sizeof(pid));
1388 #endif
1389             if (n <= 0) {
1390                 syslog(LOG_ERR, "Can't read pid from lock file %s", lock_file);
1391                 close(fd);
1392             } else {
1393                 if (kill(pid, 0) == -1 && errno == ESRCH) {
1394                     /* pid no longer exists - remove the lock file */
1395                     if (unlink(lock_file) == 0) {
1396                         close(fd);
1397                         syslog(LOG_NOTICE, "Removed stale lock on %s (pid %d)",
1398                                dev, pid);
1399                         continue;
1400                     } else
1401                         syslog(LOG_WARNING, "Couldn't remove stale lock on %s",
1402                                dev);
1403                 } else
1404                     syslog(LOG_NOTICE, "Device %s is locked by pid %d",
1405                            dev, pid);
1406             }
1407             close(fd);
1408         } else
1409             syslog(LOG_ERR, "Can't create lock file %s: %m", lock_file);
1410         free(lock_file);
1411         lock_file = NULL;
1412         return -1;
1413     }
1414
1415 #ifdef PIDSTRING
1416     sprintf(hdb_lock_buffer, "%10d\n", getpid());
1417     write(fd, hdb_lock_buffer, 11);
1418 #else
1419     pid = getpid();
1420     write(fd, &pid, sizeof pid);
1421 #endif
1422
1423     close(fd);
1424     return 0;
1425 }
1426
1427 /*
1428  * unlock - remove our lockfile
1429  */
1430 void
1431 unlock()
1432 {
1433     if (lock_file) {
1434         unlink(lock_file);
1435         free(lock_file);
1436         lock_file = NULL;
1437     }
1438 }
1439
1440 /*
1441  * SunOS doesn't have strtoul :-(
1442  */
1443 unsigned long
1444 strtoul(str, ptr, base)
1445     char *str, **ptr;
1446     int base;
1447 {
1448     return (unsigned long) strtol(str, ptr, base);
1449 }
1450
1451 /*
1452  * Or strerror :-(
1453  */
1454 extern char *sys_errlist[];
1455 extern int sys_nerr;
1456
1457 char *
1458 strerror(n)
1459     int n;
1460 {
1461     static char unknown[32];
1462
1463     if (n > 0 && n < sys_nerr)
1464         return sys_errlist[n];
1465     sprintf(unknown, "Error %d", n);
1466     return unknown;
1467 }