pppd/sys-svr4.c

   1 /*
   2  * System-dependent procedures for pppd under Solaris 2.
   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-svr4.c,v 1.18 1998/11/07 06:59:31 paulus Exp $";
  30 #endif
  31
  32 #include <limits.h>
  33 #include <stdio.h>
  34 #include <stddef.h>
  35 #include <stdlib.h>
  36 #include <ctype.h>
  37 #include <errno.h>
  38 #include <fcntl.h>
  39 #include <unistd.h>
  40 #include <termios.h>
  41 #ifndef CRTSCTS
  42 #include <sys/termiox.h>
  43 #endif
  44 #include <signal.h>
  45 #include <utmpx.h>
  46 #include <sys/types.h>
  47 #include <sys/ioccom.h>
  48 #include <sys/stream.h>
  49 #include <sys/stropts.h>
  50 #include <sys/socket.h>
  51 #include <sys/sockio.h>
  52 #include <sys/syslog.h>
  53 #include <sys/sysmacros.h>
  54 #include <sys/systeminfo.h>
  55 #include <sys/dlpi.h>
  56 #include <sys/stat.h>
  57 #include <sys/mkdev.h>
  58 #include <net/if.h>
  59 #include <net/if_arp.h>
  60 #include <net/route.h>
  61 #include <net/ppp_defs.h>
  62 #include <net/pppio.h>
  63 #include <netinet/in.h>
  64
  65 #include "pppd.h"
  66
  67 static int      pppfd;
  68 static int      fdmuxid = -1;
  69 static int      ipfd;
  70 static int      ipmuxid = -1;
  71
  72 static int      restore_term;
  73 static struct termios inittermios;
  74 #ifndef CRTSCTS
  75 static struct termiox inittermiox;
  76 static int      termiox_ok;
  77 #endif
  78 static struct winsize wsinfo;   /* Initial window size info */
  79 static pid_t    tty_sid;        /* original session ID for terminal */
  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 default_route_gateway; /* Gateway for default route added */
  91 static u_int32_t proxy_arp_addr;        /* Addr for proxy arp entry added */
  92
  93 /* Prototypes for procedures local to this file. */
  94 static int translate_speed __P((int));
  95 static int baud_rate_of __P((int));
  96 static int get_ether_addr __P((u_int32_t, struct sockaddr *));
  97 static int get_hw_addr __P((char *, struct sockaddr *));
  98 static int dlpi_attach __P((int, int));
  99 static int dlpi_info_req __P((int));
 100 static int dlpi_get_reply __P((int, union DL_primitives *, int, int));
 101 static int strioctl __P((int, int, void *, int, int));
 102
 103
 104 /*
 105  * sys_init - System-dependent initialization.
 106  */
 107 void
 108 sys_init()
 109 {
 110     int ifd, x;
 111 #ifndef sun
 112     struct ifreq ifr;
 113     struct {
 114         union DL_primitives prim;
 115         char space[64];
 116     } reply;
 117 #endif
 118
 119     ipfd = open("/dev/ip", O_RDWR, 0);
 120     if (ipfd < 0) {
 121         syslog(LOG_ERR, "Couldn't open IP device: %m");
 122         die(1);
 123     }
 124
 125     if (default_device)
 126         tty_sid = getsid((pid_t)0);
 127
 128     pppfd = open("/dev/ppp", O_RDWR | O_NONBLOCK, 0);
 129     if (pppfd < 0) {
 130         syslog(LOG_ERR, "Can't open /dev/ppp: %m");
 131         die(1);
 132     }
 133     if (kdebugflag & 1) {
 134         x = PPPDBG_LOG + PPPDBG_DRIVER;
 135         strioctl(pppfd, PPPIO_DEBUG, &x, sizeof(int), 0);
 136     }
 137
 138     /* Assign a new PPA and get its unit number. */
 139     if (strioctl(pppfd, PPPIO_NEWPPA, &ifunit, 0, sizeof(int)) < 0) {
 140         syslog(LOG_ERR, "Can't create new PPP interface: %m");
 141         die(1);
 142     }
 143
 144     /*
 145      * Open the ppp device again and link it under the ip multiplexor.
 146      * IP will assign a unit number which hopefully is the same as ifunit.
 147      * I don't know any way to be certain they will be the same. :-(
 148      */
 149     ifd = open("/dev/ppp", O_RDWR, 0);
 150     if (ifd < 0) {
 151         syslog(LOG_ERR, "Can't open /dev/ppp (2): %m");
 152         die(1);
 153     }
 154     if (kdebugflag & 1) {
 155         x = PPPDBG_LOG + PPPDBG_DRIVER;
 156         strioctl(ifd, PPPIO_DEBUG, &x, sizeof(int), 0);
 157     }
 158 #ifdef sun
 159     if (ioctl(ifd, I_PUSH, "ip") < 0) {
 160         syslog(LOG_ERR, "Can't push IP module: %m");
 161         close(ifd);
 162         die(1);
 163     }
 164 #else
 165     if (dlpi_attach(ifd, ifunit) < 0 ||
 166         dlpi_get_reply(ifd, &reply.prim, DL_OK_ACK, sizeof(reply)) < 0) {
 167         syslog(LOG_ERR, "Can't attach to ppp%d: %m", ifunit);
 168         close(ifd);
 169         die(1);
 170     }
 171 #endif
 172     ipmuxid = ioctl(ipfd, I_LINK, ifd);
 173     close(ifd);
 174     if (ipmuxid < 0) {
 175         syslog(LOG_ERR, "Can't link PPP device to IP: %m");
 176         die(1);
 177     }
 178
 179 #ifndef sun
 180     /* Set the interface name for the link. */
 181     (void) sprintf (ifr.ifr_name, "ppp%d", ifunit);
 182     ifr.ifr_metric = ipmuxid;
 183     if (strioctl(ipfd, SIOCSIFNAME, (char *)&ifr, sizeof ifr, 0) < 0) {
 184         syslog(LOG_ERR, "Can't set interface name %s: %m", ifr.ifr_name);
 185         die(1);
 186     }
 187 #endif
 188 }
 189
 190 /*
 191  * sys_cleanup - restore any system state we modified before exiting:
 192  * mark the interface down, delete default route and/or proxy arp entry.
 193  * This should call die() because it's called from die().
 194  */
 195 void
 196 sys_cleanup()
 197 {
 198     struct ifreq ifr;
 199
 200     if (if_is_up)
 201         sifdown(0);
 202     if (default_route_gateway)
 203         cifdefaultroute(0, default_route_gateway, default_route_gateway);
 204     if (proxy_arp_addr)
 205         cifproxyarp(0, proxy_arp_addr);
 206 }
 207
 208 /*
 209  * sys_close - Clean up in a child process before execing.
 210  */
 211 void
 212 sys_close()
 213 {
 214     close(ipfd);
 215     if (pppfd >= 0)
 216         close(pppfd);
 217 }
 218
 219 /*
 220  * sys_check_options - check the options that the user specified
 221  */
 222 int
 223 sys_check_options()
 224 {
 225     return 1;
 226 }
 227
 228
 229 /*
 230  * daemon - Detach us from controlling terminal session.
 231  */
 232 int
 233 daemon(nochdir, noclose)
 234     int nochdir, noclose;
 235 {
 236     int pid;
 237
 238     if ((pid = fork()) < 0)
 239         return -1;
 240     if (pid != 0)
 241         exit(0);                /* parent dies */
 242     setsid();
 243     if (!nochdir)
 244         chdir("/");
 245     if (!noclose) {
 246         fclose(stdin);          /* don't need stdin, stdout, stderr */
 247         fclose(stdout);
 248         fclose(stderr);
 249     }
 250     return 0;
 251 }
 252
 253 /*
 254  * ppp_available - check whether the system has any ppp interfaces
 255  */
 256 int
 257 ppp_available()
 258 {
 259     struct stat buf;
 260
 261     return stat("/dev/ppp", &buf) >= 0;
 262 }
 263
 264 /*
 265  * establish_ppp - Turn the serial port into a ppp interface.
 266  */
 267 void
 268 establish_ppp(fd)
 269     int fd;
 270 {
 271     int i;
 272
 273     /* Pop any existing modules off the tty stream. */
 274     for (i = 0;; ++i)
 275         if (ioctl(fd, I_LOOK, tty_modules[i]) < 0
 276             || ioctl(fd, I_POP, 0) < 0)
 277             break;
 278     tty_nmodules = i;
 279
 280     /* Push the async hdlc module and the compressor module. */
 281     if (ioctl(fd, I_PUSH, "ppp_ahdl") < 0) {
 282         syslog(LOG_ERR, "Couldn't push PPP Async HDLC module: %m");
 283         die(1);
 284     }
 285     if (kdebugflag & 4) {
 286         i = PPPDBG_LOG + PPPDBG_AHDLC;
 287         strioctl(pppfd, PPPIO_DEBUG, &i, sizeof(int), 0);
 288     }
 289     if (ioctl(fd, I_PUSH, "ppp_comp") < 0) {
 290         syslog(LOG_ERR, "Couldn't push PPP compression module: %m");
 291 /*      die(1); */
 292     }
 293     if (kdebugflag & 2) {
 294         i = PPPDBG_LOG + PPPDBG_COMP;
 295         strioctl(pppfd, PPPIO_DEBUG, &i, sizeof(int), 0);
 296     }
 297
 298     /* Link the serial port under the PPP multiplexor. */
 299     if ((fdmuxid = ioctl(pppfd, I_LINK, fd)) < 0) {
 300         syslog(LOG_ERR, "Can't link tty to PPP mux: %m");
 301         die(1);
 302     }
 303 }
 304
 305 /*
 306  * restore_loop - reattach the ppp unit to the loopback.
 307  * This doesn't need to do anything because disestablish_ppp does it.
 308  */
 309 void
 310 restore_loop()
 311 {
 312 }
 313
 314 /*
 315  * disestablish_ppp - Restore the serial port to normal operation.
 316  * It attempts to reconstruct the stream with the previously popped
 317  * modules.  This shouldn't call die() because it's called from die().
 318  */
 319 void
 320 disestablish_ppp(fd)
 321     int fd;
 322 {
 323     int i;
 324
 325     if (fdmuxid >= 0) {
 326         if (ioctl(pppfd, I_UNLINK, fdmuxid) < 0) {
 327             if (!hungup)
 328                 syslog(LOG_ERR, "Can't unlink tty from PPP mux: %m");
 329         }
 330         fdmuxid = -1;
 331
 332         if (!hungup) {
 333             while (ioctl(fd, I_POP, 0) >= 0)
 334                 ;
 335             for (i = tty_nmodules - 1; i >= 0; --i)
 336                 if (ioctl(fd, I_PUSH, tty_modules[i]) < 0)
 337                     syslog(LOG_ERR, "Couldn't restore tty module %s: %m",
 338                            tty_modules[i]);
 339         }
 340         if (hungup && default_device && tty_sid > 0) {
 341             /*
 342              * If we have received a hangup, we need to send a SIGHUP
 343              * to the terminal's controlling process.  The reason is
 344              * that the original stream head for the terminal hasn't
 345              * seen the M_HANGUP message (it went up through the ppp
 346              * driver to the stream head for our fd to /dev/ppp).
 347              */
 348             kill(tty_sid, SIGHUP);
 349         }
 350     }
 351 }
 352
 353 /*
 354  * Check whether the link seems not to be 8-bit clean.
 355  */
 356 void
 357 clean_check()
 358 {
 359     int x;
 360     char *s;
 361
 362     if (strioctl(pppfd, PPPIO_GCLEAN, &x, 0, sizeof(x)) < 0)
 363         return;
 364     s = NULL;
 365     switch (~x) {
 366     case RCV_B7_0:
 367         s = "bit 7 set to 1";
 368         break;
 369     case RCV_B7_1:
 370         s = "bit 7 set to 0";
 371         break;
 372     case RCV_EVNP:
 373         s = "odd parity";
 374         break;
 375     case RCV_ODDP:
 376         s = "even parity";
 377         break;
 378     }
 379     if (s != NULL) {
 380         syslog(LOG_WARNING, "Serial link is not 8-bit clean:");
 381         syslog(LOG_WARNING, "All received characters had %s", s);
 382     }
 383 }
 384
 385 /*
 386  * List of valid speeds.
 387  */
 388 struct speed {
 389     int speed_int, speed_val;
 390 } speeds[] = {
 391 #ifdef B50
 392     { 50, B50 },
 393 #endif
 394 #ifdef B75
 395     { 75, B75 },
 396 #endif
 397 #ifdef B110
 398     { 110, B110 },
 399 #endif
 400 #ifdef B134
 401     { 134, B134 },
 402 #endif
 403 #ifdef B150
 404     { 150, B150 },
 405 #endif
 406 #ifdef B200
 407     { 200, B200 },
 408 #endif
 409 #ifdef B300
 410     { 300, B300 },
 411 #endif
 412 #ifdef B600
 413     { 600, B600 },
 414 #endif
 415 #ifdef B1200
 416     { 1200, B1200 },
 417 #endif
 418 #ifdef B1800
 419     { 1800, B1800 },
 420 #endif
 421 #ifdef B2000
 422     { 2000, B2000 },
 423 #endif
 424 #ifdef B2400
 425     { 2400, B2400 },
 426 #endif
 427 #ifdef B3600
 428     { 3600, B3600 },
 429 #endif
 430 #ifdef B4800
 431     { 4800, B4800 },
 432 #endif
 433 #ifdef B7200
 434     { 7200, B7200 },
 435 #endif
 436 #ifdef B9600
 437     { 9600, B9600 },
 438 #endif
 439 #ifdef B19200
 440     { 19200, B19200 },
 441 #endif
 442 #ifdef B38400
 443     { 38400, B38400 },
 444 #endif
 445 #ifdef EXTA
 446     { 19200, EXTA },
 447 #endif
 448 #ifdef EXTB
 449     { 38400, EXTB },
 450 #endif
 451 #ifdef B57600
 452     { 57600, B57600 },
 453 #endif
 454 #ifdef B115200
 455     { 115200, B115200 },
 456 #endif
 457     { 0, 0 }
 458 };
 459
 460 /*
 461  * Translate from bits/second to a speed_t.
 462  */
 463 static int
 464 translate_speed(bps)
 465     int bps;
 466 {
 467     struct speed *speedp;
 468
 469     if (bps == 0)
 470         return 0;
 471     for (speedp = speeds; speedp->speed_int; speedp++)
 472         if (bps == speedp->speed_int)
 473             return speedp->speed_val;
 474     syslog(LOG_WARNING, "speed %d not supported", bps);
 475     return 0;
 476 }
 477
 478 /*
 479  * Translate from a speed_t to bits/second.
 480  */
 481 static int
 482 baud_rate_of(speed)
 483     int speed;
 484 {
 485     struct speed *speedp;
 486
 487     if (speed == 0)
 488         return 0;
 489     for (speedp = speeds; speedp->speed_int; speedp++)
 490         if (speed == speedp->speed_val)
 491             return speedp->speed_int;
 492     return 0;
 493 }
 494
 495 /*
 496  * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
 497  * at the requested speed, etc.  If `local' is true, set CLOCAL
 498  * regardless of whether the modem option was specified.
 499  */
 500 void
 501 set_up_tty(fd, local)
 502     int fd, local;
 503 {
 504     int speed;
 505     struct termios tios;
 506 #if !defined (CRTSCTS)
 507     struct termiox tiox;
 508 #endif
 509
 510     if (tcgetattr(fd, &tios) < 0) {
 511         syslog(LOG_ERR, "tcgetattr: %m");
 512         die(1);
 513     }
 514
 515 #ifndef CRTSCTS
 516     termiox_ok = 1;
 517     if (ioctl (fd, TCGETX, &tiox) < 0) {
 518         termiox_ok = 0;
 519         if (errno != ENOTTY)
 520             syslog (LOG_ERR, "TCGETX: %m");
 521     }
 522 #endif
 523
 524     if (!restore_term) {
 525         inittermios = tios;
 526 #ifndef CRTSCTS
 527         inittermiox = tiox;
 528 #endif
 529         ioctl(fd, TIOCGWINSZ, &wsinfo);
 530     }
 531
 532     tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
 533 #ifdef CRTSCTS
 534     if (crtscts > 0)
 535         tios.c_cflag |= CRTSCTS;
 536     else if (crtscts < 0)
 537         tios.c_cflag &= ~CRTSCTS;
 538 #else
 539     if (crtscts != 0 && !termiox_ok) {
 540         syslog(LOG_ERR, "Can't set RTS/CTS flow control");
 541     } else if (crtscts > 0) {
 542         tiox.x_hflag |= RTSXOFF|CTSXON;
 543     } else if (crtscts < 0) {
 544         tiox.x_hflag &= ~(RTSXOFF|CTSXON);
 545     }
 546 #endif
 547
 548     tios.c_cflag |= CS8 | CREAD | HUPCL;
 549     if (local || !modem)
 550         tios.c_cflag |= CLOCAL;
 551     tios.c_iflag = IGNBRK | IGNPAR;
 552     tios.c_oflag = 0;
 553     tios.c_lflag = 0;
 554     tios.c_cc[VMIN] = 1;
 555     tios.c_cc[VTIME] = 0;
 556
 557     if (crtscts == -2) {
 558         tios.c_iflag |= IXON | IXOFF;
 559         tios.c_cc[VSTOP] = 0x13;        /* DC3 = XOFF = ^S */
 560         tios.c_cc[VSTART] = 0x11;       /* DC1 = XON  = ^Q */
 561     }
 562
 563     speed = translate_speed(inspeed);
 564     if (speed) {
 565         cfsetospeed(&tios, speed);
 566         cfsetispeed(&tios, speed);
 567     } else {
 568         speed = cfgetospeed(&tios);
 569         /*
 570          * We can't proceed if the serial port speed is 0,
 571          * since that implies that the serial port is disabled.
 572          */
 573         if (speed == B0) {
 574             syslog(LOG_ERR, "Baud rate for %s is 0; need explicit baud rate",
 575                    devnam);
 576             die(1);
 577         }
 578     }
 579
 580     if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
 581         syslog(LOG_ERR, "tcsetattr: %m");
 582         die(1);
 583     }
 584
 585 #ifndef CRTSCTS
 586     if (termiox_ok && ioctl (fd, TCSETXF, &tiox) < 0){
 587         syslog (LOG_ERR, "TCSETXF: %m");
 588     }
 589 #endif
 590
 591     baud_rate = inspeed = baud_rate_of(speed);
 592     restore_term = 1;
 593 }
 594
 595 /*
 596  * restore_tty - restore the terminal to the saved settings.
 597  */
 598 void
 599 restore_tty(fd)
 600     int fd;
 601 {
 602     if (restore_term) {
 603         if (!default_device) {
 604             /*
 605              * Turn off echoing, because otherwise we can get into
 606              * a loop with the tty and the modem echoing to each other.
 607              * We presume we are the sole user of this tty device, so
 608              * when we close it, it will revert to its defaults anyway.
 609              */
 610             inittermios.c_lflag &= ~(ECHO | ECHONL);
 611         }
 612         if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
 613             if (!hungup && errno != ENXIO)
 614                 syslog(LOG_WARNING, "tcsetattr: %m");
 615 #ifndef CRTSCTS
 616         if (ioctl (fd, TCSETXF, &inittermiox) < 0){
 617             if (!hungup && errno != ENXIO)
 618                 syslog (LOG_ERR, "TCSETXF: %m");
 619         }
 620 #endif
 621         ioctl(fd, TIOCSWINSZ, &wsinfo);
 622         restore_term = 0;
 623     }
 624 }
 625
 626 /*
 627  * setdtr - control the DTR line on the serial port.
 628  * This is called from die(), so it shouldn't call die().
 629  */
 630 void
 631 setdtr(fd, on)
 632 int fd, on;
 633 {
 634     int modembits = TIOCM_DTR;
 635
 636     ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
 637 }
 638
 639 /*
 640  * open_loopback - open the device we use for getting packets
 641  * in demand mode.  Under Solaris 2, we use our existing fd
 642  * to the ppp driver.
 643  */
 644 void
 645 open_ppp_loopback()
 646 {
 647 }
 648
 649 /*
 650  * output - Output PPP packet.
 651  */
 652 void
 653 output(unit, p, len)
 654     int unit;
 655     u_char *p;
 656     int len;
 657 {
 658     struct strbuf data;
 659     int retries;
 660     struct pollfd pfd;
 661
 662     if (debug)
 663         log_packet(p, len, "sent ", LOG_DEBUG);
 664
 665     data.len = len;
 666     data.buf = (caddr_t) p;
 667     retries = 4;
 668     while (putmsg(pppfd, NULL, &data, 0) < 0) {
 669         if (--retries < 0 || (errno != EWOULDBLOCK && errno != EAGAIN)) {
 670             if (errno != ENXIO)
 671                 syslog(LOG_ERR, "Couldn't send packet: %m");
 672             break;
 673         }
 674         pfd.fd = pppfd;
 675         pfd.events = POLLOUT;
 676         poll(&pfd, 1, 250);     /* wait for up to 0.25 seconds */
 677     }
 678 }
 679
 680
 681 /*
 682  * wait_input - wait until there is data available on fd,
 683  * for the length of time specified by *timo (indefinite
 684  * if timo is NULL).
 685  */
 686 void
 687 wait_input(timo)
 688     struct timeval *timo;
 689 {
 690     int t;
 691     struct pollfd pfd;
 692
 693     t = timo == NULL? -1: timo->tv_sec * 1000 + timo->tv_usec / 1000;
 694     pfd.fd = pppfd;
 695     pfd.events = POLLIN | POLLPRI | POLLHUP;
 696     if (poll(&pfd, 1, t) < 0 && errno != EINTR) {
 697         syslog(LOG_ERR, "poll: %m");
 698         die(1);
 699     }
 700 }
 701
 702 /*
 703  * wait_loop_output - wait until there is data available on the
 704  * loopback, for the length of time specified by *timo (indefinite
 705  * if timo is NULL).
 706  */
 707 void
 708 wait_loop_output(timo)
 709     struct timeval *timo;
 710 {
 711     wait_input(timo);
 712 }
 713
 714 /*
 715  * wait_time - wait for a given length of time or until a
 716  * signal is received.
 717  */
 718 void
 719 wait_time(timo)
 720     struct timeval *timo;
 721 {
 722     int n;
 723
 724     n = select(0, NULL, NULL, NULL, timo);
 725     if (n < 0 && errno != EINTR) {
 726         syslog(LOG_ERR, "select: %m");
 727         die(1);
 728     }
 729 }
 730
 731
 732 /*
 733  * read_packet - get a PPP packet from the serial device.
 734  */
 735 int
 736 read_packet(buf)
 737     u_char *buf;
 738 {
 739     struct strbuf ctrl, data;
 740     int flags, len;
 741     unsigned char ctrlbuf[sizeof(union DL_primitives) + 64];
 742
 743     for (;;) {
 744         data.maxlen = PPP_MRU + PPP_HDRLEN;
 745         data.buf = (caddr_t) buf;
 746         ctrl.maxlen = sizeof(ctrlbuf);
 747         ctrl.buf = (caddr_t) ctrlbuf;
 748         flags = 0;
 749         len = getmsg(pppfd, &ctrl, &data, &flags);
 750         if (len < 0) {
 751             if (errno = EAGAIN || errno == EINTR)
 752                 return -1;
 753             syslog(LOG_ERR, "Error reading packet: %m");
 754             die(1);
 755         }
 756
 757         if (ctrl.len <= 0)
 758             return data.len;
 759
 760         /*
 761          * Got a M_PROTO or M_PCPROTO message.  Interpret it
 762          * as a DLPI primitive??
 763          */
 764         if (debug)
 765             syslog(LOG_DEBUG, "got dlpi prim 0x%x, len=%d",
 766                    ((union DL_primitives *)ctrlbuf)->dl_primitive, ctrl.len);
 767
 768     }
 769 }
 770
 771 /*
 772  * get_loop_output - get outgoing packets from the ppp device,
 773  * and detect when we want to bring the real link up.
 774  * Return value is 1 if we need to bring up the link, 0 otherwise.
 775  */
 776 int
 777 get_loop_output()
 778 {
 779     int len;
 780     int rv = 0;
 781
 782     while ((len = read_packet(inpacket_buf)) > 0) {
 783         if (loop_frame(inpacket_buf, len))
 784             rv = 1;
 785     }
 786     return rv;
 787 }
 788
 789 /*
 790  * ppp_send_config - configure the transmit characteristics of
 791  * the ppp interface.
 792  */
 793 void
 794 ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
 795     int unit, mtu;
 796     u_int32_t asyncmap;
 797     int pcomp, accomp;
 798 {
 799     int cf[2];
 800     struct ifreq ifr;
 801
 802     link_mtu = mtu;
 803     if (strioctl(pppfd, PPPIO_MTU, &mtu, sizeof(mtu), 0) < 0) {
 804         if (hungup && errno == ENXIO)
 805             return;
 806         syslog(LOG_ERR, "Couldn't set MTU: %m");
 807     }
 808     if (fdmuxid >= 0) {
 809         /* can't set these if we don't have a stream attached below /dev/ppp */
 810         if (strioctl(pppfd, PPPIO_XACCM, &asyncmap, sizeof(asyncmap), 0) < 0) {
 811             syslog(LOG_ERR, "Couldn't set transmit ACCM: %m");
 812         }
 813         cf[0] = (pcomp? COMP_PROT: 0) + (accomp? COMP_AC: 0);
 814         cf[1] = COMP_PROT | COMP_AC;
 815         if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
 816             syslog(LOG_ERR, "Couldn't set prot/AC compression: %m");
 817         }
 818     }
 819
 820     /* set the MTU for IP as well */
 821     memset(&ifr, 0, sizeof(ifr));
 822     strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 823     ifr.ifr_metric = link_mtu;
 824     if (ioctl(ipfd, SIOCSIFMTU, &ifr) < 0) {
 825         syslog(LOG_ERR, "Couldn't set IP MTU: %m");
 826     }
 827 }
 828
 829 /*
 830  * ppp_set_xaccm - set the extended transmit ACCM for the interface.
 831  */
 832 void
 833 ppp_set_xaccm(unit, accm)
 834     int unit;
 835     ext_accm accm;
 836 {
 837     if (fdmuxid >= 0
 838         && strioctl(pppfd, PPPIO_XACCM, accm, sizeof(ext_accm), 0) < 0) {
 839         if (!hungup || errno != ENXIO)
 840             syslog(LOG_WARNING, "Couldn't set extended ACCM: %m");
 841     }
 842 }
 843
 844 /*
 845  * ppp_recv_config - configure the receive-side characteristics of
 846  * the ppp interface.
 847  */
 848 void
 849 ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
 850     int unit, mru;
 851     u_int32_t asyncmap;
 852     int pcomp, accomp;
 853 {
 854     int cf[2];
 855
 856     link_mru = mru;
 857     if (strioctl(pppfd, PPPIO_MRU, &mru, sizeof(mru), 0) < 0) {
 858         if (hungup && errno == ENXIO)
 859             return;
 860         syslog(LOG_ERR, "Couldn't set MRU: %m");
 861     }
 862     if (fdmuxid >= 0) {
 863         /* can't set these if we don't have a stream attached below /dev/ppp */
 864         if (strioctl(pppfd, PPPIO_RACCM, &asyncmap, sizeof(asyncmap), 0) < 0) {
 865             syslog(LOG_ERR, "Couldn't set receive ACCM: %m");
 866         }
 867         cf[0] = (pcomp? DECOMP_PROT: 0) + (accomp? DECOMP_AC: 0);
 868         cf[1] = DECOMP_PROT | DECOMP_AC;
 869         if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
 870             syslog(LOG_ERR, "Couldn't set prot/AC decompression: %m");
 871         }
 872     }
 873 }
 874
 875 /*
 876  * ccp_test - ask kernel whether a given compression method
 877  * is acceptable for use.
 878  */
 879 int
 880 ccp_test(unit, opt_ptr, opt_len, for_transmit)
 881     int unit, opt_len, for_transmit;
 882     u_char *opt_ptr;
 883 {
 884     if (strioctl(pppfd, (for_transmit? PPPIO_XCOMP: PPPIO_RCOMP),
 885                  opt_ptr, opt_len, 0) >= 0)
 886         return 1;
 887     return (errno == ENOSR)? 0: -1;
 888 }
 889
 890 /*
 891  * ccp_flags_set - inform kernel about the current state of CCP.
 892  */
 893 void
 894 ccp_flags_set(unit, isopen, isup)
 895     int unit, isopen, isup;
 896 {
 897     int cf[2];
 898
 899     cf[0] = (isopen? CCP_ISOPEN: 0) + (isup? CCP_ISUP: 0);
 900     cf[1] = CCP_ISOPEN | CCP_ISUP | CCP_ERROR | CCP_FATALERROR;
 901     if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
 902         if (!hungup || errno != ENXIO)
 903             syslog(LOG_ERR, "Couldn't set kernel CCP state: %m");
 904     }
 905 }
 906
 907 /*
 908  * get_idle_time - return how long the link has been idle.
 909  */
 910 int
 911 get_idle_time(u, ip)
 912     int u;
 913     struct ppp_idle *ip;
 914 {
 915     return strioctl(pppfd, PPPIO_GIDLE, ip, 0, sizeof(struct ppp_idle)) >= 0;
 916 }
 917
 918 #if 0
 919 /*
 920  * set_filters - transfer the pass and active filters to the kernel.
 921  */
 922 int
 923 set_filters(pass, active)
 924     struct bpf_program *pass, *active;
 925 {
 926     int ret = 1;
 927
 928     if (pass->bf_len > 0) {
 929         if (strioctl(pppfd, PPPIO_PASSFILT, pass,
 930                      sizeof(struct bpf_program), 0) < 0) {
 931             syslog(LOG_ERR, "Couldn't set pass-filter in kernel: %m");
 932             ret = 0;
 933         }
 934     }
 935     if (active->bf_len > 0) {
 936         if (strioctl(pppfd, PPPIO_ACTIVEFILT, active,
 937                      sizeof(struct bpf_program), 0) < 0) {
 938             syslog(LOG_ERR, "Couldn't set active-filter in kernel: %m");
 939             ret = 0;
 940         }
 941     }
 942     return ret;
 943 }
 944 #endif
 945
 946 /*
 947  * ccp_fatal_error - returns 1 if decompression was disabled as a
 948  * result of an error detected after decompression of a packet,
 949  * 0 otherwise.  This is necessary because of patent nonsense.
 950  */
 951 int
 952 ccp_fatal_error(unit)
 953     int unit;
 954 {
 955     int cf[2];
 956
 957     cf[0] = cf[1] = 0;
 958     if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
 959         if (errno != ENXIO && errno != EINVAL)
 960             syslog(LOG_ERR, "Couldn't get compression flags: %m");
 961         return 0;
 962     }
 963     return cf[0] & CCP_FATALERROR;
 964 }
 965
 966 /*
 967  * sifvjcomp - config tcp header compression
 968  */
 969 int
 970 sifvjcomp(u, vjcomp, xcidcomp, xmaxcid)
 971     int u, vjcomp, xcidcomp, xmaxcid;
 972 {
 973     int cf[2];
 974     char maxcid[2];
 975
 976     if (vjcomp) {
 977         maxcid[0] = xcidcomp;
 978         maxcid[1] = 15;         /* XXX should be rmaxcid */
 979         if (strioctl(pppfd, PPPIO_VJINIT, maxcid, sizeof(maxcid), 0) < 0) {
 980             syslog(LOG_ERR, "Couldn't initialize VJ compression: %m");
 981         }
 982     }
 983
 984     cf[0] = (vjcomp? COMP_VJC + DECOMP_VJC: 0)  /* XXX this is wrong */
 985         + (xcidcomp? COMP_VJCCID + DECOMP_VJCCID: 0);
 986     cf[1] = COMP_VJC + DECOMP_VJC + COMP_VJCCID + DECOMP_VJCCID;
 987     if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
 988         if (vjcomp)
 989             syslog(LOG_ERR, "Couldn't enable VJ compression: %m");
 990     }
 991
 992     return 1;
 993 }
 994
 995 /*
 996  * sifup - Config the interface up and enable IP packets to pass.
 997  */
 998 int
 999 sifup(u)
1000     int u;
1001 {
1002     struct ifreq ifr;
1003
1004     strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
1005     if (ioctl(ipfd, SIOCGIFFLAGS, &ifr) < 0) {
1006         syslog(LOG_ERR, "Couldn't mark interface up (get): %m");
1007         return 0;
1008     }
1009     ifr.ifr_flags |= IFF_UP;
1010     if (ioctl(ipfd, SIOCSIFFLAGS, &ifr) < 0) {
1011         syslog(LOG_ERR, "Couldn't mark interface up (set): %m");
1012         return 0;
1013     }
1014     if_is_up = 1;
1015     return 1;
1016 }
1017
1018 /*
1019  * sifdown - Config the interface down and disable IP.
1020  */
1021 int
1022 sifdown(u)
1023     int u;
1024 {
1025     struct ifreq ifr;
1026
1027     if (ipmuxid < 0)
1028         return 1;
1029     strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
1030     if (ioctl(ipfd, SIOCGIFFLAGS, &ifr) < 0) {
1031         syslog(LOG_ERR, "Couldn't mark interface down (get): %m");
1032         return 0;
1033     }
1034     ifr.ifr_flags &= ~IFF_UP;
1035     if (ioctl(ipfd, SIOCSIFFLAGS, &ifr) < 0) {
1036         syslog(LOG_ERR, "Couldn't mark interface down (set): %m");
1037         return 0;
1038     }
1039     if_is_up = 0;
1040     return 1;
1041 }
1042
1043 /*
1044  * sifnpmode - Set the mode for handling packets for a given NP.
1045  */
1046 int
1047 sifnpmode(u, proto, mode)
1048     int u;
1049     int proto;
1050     enum NPmode mode;
1051 {
1052     int npi[2];
1053
1054     npi[0] = proto;
1055     npi[1] = (int) mode;
1056     if (strioctl(pppfd, PPPIO_NPMODE, &npi, 2 * sizeof(int), 0) < 0) {
1057         syslog(LOG_ERR, "ioctl(set NP %d mode to %d): %m", proto, mode);
1058         return 0;
1059     }
1060     return 1;
1061 }
1062
1063 #define INET_ADDR(x)    (((struct sockaddr_in *) &(x))->sin_addr.s_addr)
1064
1065 /*
1066  * sifaddr - Config the interface IP addresses and netmask.
1067  */
1068 int
1069 sifaddr(u, o, h, m)
1070     int u;
1071     u_int32_t o, h, m;
1072 {
1073     struct ifreq ifr;
1074     int ret = 1;
1075
1076     memset(&ifr, 0, sizeof(ifr));
1077     strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
1078     ifr.ifr_addr.sa_family = AF_INET;
1079     INET_ADDR(ifr.ifr_addr) = m;
1080     if (ioctl(ipfd, SIOCSIFNETMASK, &ifr) < 0) {
1081         syslog(LOG_ERR, "Couldn't set IP netmask: %m");
1082         ret = 0;
1083     }
1084     ifr.ifr_addr.sa_family = AF_INET;
1085     INET_ADDR(ifr.ifr_addr) = o;
1086     if (ioctl(ipfd, SIOCSIFADDR, &ifr) < 0) {
1087         syslog(LOG_ERR, "Couldn't set local IP address: %m");
1088         ret = 0;
1089     }
1090
1091     /*
1092      * On some systems, we have to explicitly set the point-to-point
1093      * flag bit before we can set a destination address.
1094      */
1095     if (ioctl(ipfd, SIOCGIFFLAGS, &ifr) >= 0
1096         && (ifr.ifr_flags & IFF_POINTOPOINT) == 0) {
1097         ifr.ifr_flags |= IFF_POINTOPOINT;
1098         if (ioctl(ipfd, SIOCSIFFLAGS, &ifr) < 0) {
1099             syslog(LOG_ERR, "Couldn't mark interface pt-to-pt: %m");
1100             ret = 0;
1101         }
1102     }
1103     ifr.ifr_dstaddr.sa_family = AF_INET;
1104     INET_ADDR(ifr.ifr_dstaddr) = h;
1105     if (ioctl(ipfd, SIOCSIFDSTADDR, &ifr) < 0) {
1106         syslog(LOG_ERR, "Couldn't set remote IP address: %m");
1107         ret = 0;
1108     }
1109 #if 0   /* now done in ppp_send_config */
1110     ifr.ifr_metric = link_mtu;
1111     if (ioctl(ipfd, SIOCSIFMTU, &ifr) < 0) {
1112         syslog(LOG_ERR, "Couldn't set IP MTU: %m");
1113     }
1114 #endif
1115
1116     return ret;
1117 }
1118
1119 /*
1120  * cifaddr - Clear the interface IP addresses, and delete routes
1121  * through the interface if possible.
1122  */
1123 int
1124 cifaddr(u, o, h)
1125     int u;
1126     u_int32_t o, h;
1127 {
1128 #if defined(__USLC__)           /* was: #if 0 */
1129     cifroute(unit, ouraddr, hisaddr);
1130     if (ipmuxid >= 0) {
1131         syslog(LOG_NOTICE, "Removing ppp interface unit");
1132         if (ioctl(ipfd, I_UNLINK, ipmuxid) < 0) {
1133             syslog(LOG_ERR, "Can't remove ppp interface unit: %m");
1134             return 0;
1135         }
1136         ipmuxid = -1;
1137     }
1138 #endif
1139     return 1;
1140 }
1141
1142 /*
1143  * sifdefaultroute - assign a default route through the address given.
1144  */
1145 int
1146 sifdefaultroute(u, l, g)
1147     int u;
1148     u_int32_t l, g;
1149 {
1150     struct rtentry rt;
1151
1152 #if defined(__USLC__)
1153     g = l;                      /* use the local address as gateway */
1154 #endif
1155     memset(&rt, 0, sizeof(rt));
1156     rt.rt_dst.sa_family = AF_INET;
1157     INET_ADDR(rt.rt_dst) = 0;
1158     rt.rt_gateway.sa_family = AF_INET;
1159     INET_ADDR(rt.rt_gateway) = g;
1160     rt.rt_flags = RTF_GATEWAY;
1161
1162     if (ioctl(ipfd, SIOCADDRT, &rt) < 0) {
1163         syslog(LOG_ERR, "Can't add default route: %m");
1164         return 0;
1165     }
1166
1167     default_route_gateway = g;
1168     return 1;
1169 }
1170
1171 /*
1172  * cifdefaultroute - delete a default route through the address given.
1173  */
1174 int
1175 cifdefaultroute(u, l, g)
1176     int u;
1177     u_int32_t l, g;
1178 {
1179     struct rtentry rt;
1180
1181 #if defined(__USLC__)
1182     g = l;                      /* use the local address as gateway */
1183 #endif
1184     memset(&rt, 0, sizeof(rt));
1185     rt.rt_dst.sa_family = AF_INET;
1186     INET_ADDR(rt.rt_dst) = 0;
1187     rt.rt_gateway.sa_family = AF_INET;
1188     INET_ADDR(rt.rt_gateway) = g;
1189     rt.rt_flags = RTF_GATEWAY;
1190
1191     if (ioctl(ipfd, SIOCDELRT, &rt) < 0) {
1192         syslog(LOG_ERR, "Can't delete default route: %m");
1193         return 0;
1194     }
1195
1196     default_route_gateway = 0;
1197     return 1;
1198 }
1199
1200 /*
1201  * sifproxyarp - Make a proxy ARP entry for the peer.
1202  */
1203 int
1204 sifproxyarp(unit, hisaddr)
1205     int unit;
1206     u_int32_t hisaddr;
1207 {
1208     struct arpreq arpreq;
1209
1210     memset(&arpreq, 0, sizeof(arpreq));
1211     if (!get_ether_addr(hisaddr, &arpreq.arp_ha))
1212         return 0;
1213
1214     arpreq.arp_pa.sa_family = AF_INET;
1215     INET_ADDR(arpreq.arp_pa) = hisaddr;
1216     arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1217     if (ioctl(ipfd, SIOCSARP, (caddr_t) &arpreq) < 0) {
1218         syslog(LOG_ERR, "Couldn't set proxy ARP entry: %m");
1219         return 0;
1220     }
1221
1222     proxy_arp_addr = hisaddr;
1223     return 1;
1224 }
1225
1226 /*
1227  * cifproxyarp - Delete the proxy ARP entry for the peer.
1228  */
1229 int
1230 cifproxyarp(unit, hisaddr)
1231     int unit;
1232     u_int32_t hisaddr;
1233 {
1234     struct arpreq arpreq;
1235
1236     memset(&arpreq, 0, sizeof(arpreq));
1237     arpreq.arp_pa.sa_family = AF_INET;
1238     INET_ADDR(arpreq.arp_pa) = hisaddr;
1239     if (ioctl(ipfd, SIOCDARP, (caddr_t)&arpreq) < 0) {
1240         syslog(LOG_ERR, "Couldn't delete proxy ARP entry: %m");
1241         return 0;
1242     }
1243
1244     proxy_arp_addr = 0;
1245     return 1;
1246 }
1247
1248 /*
1249  * get_ether_addr - get the hardware address of an interface on the
1250  * the same subnet as ipaddr.
1251  */
1252 #define MAX_IFS         32
1253
1254 static int
1255 get_ether_addr(ipaddr, hwaddr)
1256     u_int32_t ipaddr;
1257     struct sockaddr *hwaddr;
1258 {
1259     struct ifreq *ifr, *ifend, ifreq;
1260     int nif;
1261     struct ifconf ifc;
1262     u_int32_t ina, mask;
1263
1264     /*
1265      * Scan through the system's network interfaces.
1266      */
1267 #ifdef SIOCGIFNUM
1268     if (ioctl(ipfd, SIOCGIFNUM, &nif) < 0)
1269 #endif
1270         nif = MAX_IFS;
1271     ifc.ifc_len = nif * sizeof(struct ifreq);
1272     ifc.ifc_buf = (caddr_t) malloc(ifc.ifc_len);
1273     if (ifc.ifc_buf == 0)
1274         return 0;
1275     if (ioctl(ipfd, SIOCGIFCONF, &ifc) < 0) {
1276         syslog(LOG_WARNING, "Couldn't get system interface list: %m");
1277         free(ifc.ifc_buf);
1278         return 0;
1279     }
1280     ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1281     for (ifr = ifc.ifc_req; ifr < ifend; ++ifr) {
1282         if (ifr->ifr_addr.sa_family != AF_INET)
1283             continue;
1284         /*
1285          * Check that the interface is up, and not point-to-point or loopback.
1286          */
1287         strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1288         if (ioctl(ipfd, SIOCGIFFLAGS, &ifreq) < 0)
1289             continue;
1290         if ((ifreq.ifr_flags &
1291              (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
1292             != (IFF_UP|IFF_BROADCAST))
1293             continue;
1294         /*
1295          * Get its netmask and check that it's on the right subnet.
1296          */
1297         if (ioctl(ipfd, SIOCGIFNETMASK, &ifreq) < 0)
1298             continue;
1299         ina = INET_ADDR(ifr->ifr_addr);
1300         mask = INET_ADDR(ifreq.ifr_addr);
1301         if ((ipaddr & mask) == (ina & mask))
1302             break;
1303     }
1304
1305     if (ifr >= ifend) {
1306         syslog(LOG_WARNING, "No suitable interface found for proxy ARP");
1307         free(ifc.ifc_buf);
1308         return 0;
1309     }
1310
1311     syslog(LOG_INFO, "found interface %s for proxy ARP", ifr->ifr_name);
1312     if (!get_hw_addr(ifr->ifr_name, hwaddr)) {
1313         syslog(LOG_ERR, "Couldn't get hardware address for %s", ifr->ifr_name);
1314         free(ifc.ifc_buf);
1315         return 0;
1316     }
1317
1318     free(ifc.ifc_buf);
1319     return 1;
1320 }
1321
1322 /*
1323  * get_hw_addr - obtain the hardware address for a named interface.
1324  */
1325 static int
1326 get_hw_addr(name, hwaddr)
1327     char *name;
1328     struct sockaddr *hwaddr;
1329 {
1330     char *p, *q;
1331     int unit, iffd, adrlen;
1332     unsigned char *adrp;
1333     char ifdev[24];
1334     struct {
1335         union DL_primitives prim;
1336         char space[64];
1337     } reply;
1338
1339     /*
1340      * We have to open the device and ask it for its hardware address.
1341      * First split apart the device name and unit.
1342      */
1343     strcpy(ifdev, "/dev/");
1344     q = ifdev + 5;              /* strlen("/dev/") */
1345     while (*name != 0 && !isdigit(*name))
1346         *q++ = *name++;
1347     *q = 0;
1348     unit = atoi(name);
1349
1350     /*
1351      * Open the device and do a DLPI attach and phys_addr_req.
1352      */
1353     iffd = open(ifdev, O_RDWR);
1354     if (iffd < 0) {
1355         syslog(LOG_ERR, "Can't open %s: %m", ifdev);
1356         return 0;
1357     }
1358     if (dlpi_attach(iffd, unit) < 0
1359         || dlpi_get_reply(iffd, &reply.prim, DL_OK_ACK, sizeof(reply)) < 0
1360         || dlpi_info_req(iffd) < 0
1361         || dlpi_get_reply(iffd, &reply.prim, DL_INFO_ACK, sizeof(reply)) < 0) {
1362         close(iffd);
1363         return 0;
1364     }
1365
1366     adrlen = reply.prim.info_ack.dl_addr_length;
1367     adrp = (unsigned char *)&reply + reply.prim.info_ack.dl_addr_offset;
1368 #if DL_CURRENT_VERSION >= 2
1369     if (reply.prim.info_ack.dl_sap_length < 0)
1370         adrlen += reply.prim.info_ack.dl_sap_length;
1371     else
1372         adrp += reply.prim.info_ack.dl_sap_length;
1373 #endif
1374     hwaddr->sa_family = AF_UNSPEC;
1375     memcpy(hwaddr->sa_data, adrp, adrlen);
1376
1377     return 1;
1378 }
1379
1380 static int
1381 dlpi_attach(fd, ppa)
1382     int fd, ppa;
1383 {
1384     dl_attach_req_t req;
1385     struct strbuf buf;
1386
1387     req.dl_primitive = DL_ATTACH_REQ;
1388     req.dl_ppa = ppa;
1389     buf.len = sizeof(req);
1390     buf.buf = (void *) &req;
1391     return putmsg(fd, &buf, NULL, RS_HIPRI);
1392 }
1393
1394 static int
1395 dlpi_info_req(fd)
1396     int fd;
1397 {
1398     dl_info_req_t req;
1399     struct strbuf buf;
1400
1401     req.dl_primitive = DL_INFO_REQ;
1402     buf.len = sizeof(req);
1403     buf.buf = (void *) &req;
1404     return putmsg(fd, &buf, NULL, RS_HIPRI);
1405 }
1406
1407 static int
1408 dlpi_get_reply(fd, reply, expected_prim, maxlen)
1409     union DL_primitives *reply;
1410     int fd, expected_prim, maxlen;
1411 {
1412     struct strbuf buf;
1413     int flags, n;
1414     struct pollfd pfd;
1415
1416     /*
1417      * Use poll to wait for a message with a timeout.
1418      */
1419     pfd.fd = fd;
1420     pfd.events = POLLIN | POLLPRI;
1421     do {
1422         n = poll(&pfd, 1, 1000);
1423     } while (n == -1 && errno == EINTR);
1424     if (n <= 0)
1425         return -1;
1426
1427     /*
1428      * Get the reply.
1429      */
1430     buf.maxlen = maxlen;
1431     buf.buf = (void *) reply;
1432     flags = 0;
1433     if (getmsg(fd, &buf, NULL, &flags) < 0)
1434         return -1;
1435
1436     if (buf.len < sizeof(ulong)) {
1437         if (debug)
1438             syslog(LOG_DEBUG, "dlpi response short (len=%d)\n", buf.len);
1439         return -1;
1440     }
1441
1442     if (reply->dl_primitive == expected_prim)
1443         return 0;
1444
1445     if (debug) {
1446         if (reply->dl_primitive == DL_ERROR_ACK) {
1447             syslog(LOG_DEBUG, "dlpi error %d (unix errno %d) for prim %x\n",
1448                    reply->error_ack.dl_errno, reply->error_ack.dl_unix_errno,
1449                    reply->error_ack.dl_error_primitive);
1450         } else {
1451             syslog(LOG_DEBUG, "dlpi unexpected response prim %x\n",
1452                    reply->dl_primitive);
1453         }
1454     }
1455
1456     return -1;
1457 }
1458
1459 /*
1460  * Return user specified netmask, modified by any mask we might determine
1461  * for address `addr' (in network byte order).
1462  * Here we scan through the system's list of interfaces, looking for
1463  * any non-point-to-point interfaces which might appear to be on the same
1464  * network as `addr'.  If we find any, we OR in their netmask to the
1465  * user-specified netmask.
1466  */
1467 u_int32_t
1468 GetMask(addr)
1469     u_int32_t addr;
1470 {
1471     u_int32_t mask, nmask, ina;
1472     struct ifreq *ifr, *ifend, ifreq;
1473     int nif;
1474     struct ifconf ifc;
1475
1476     addr = ntohl(addr);
1477     if (IN_CLASSA(addr))        /* determine network mask for address class */
1478         nmask = IN_CLASSA_NET;
1479     else if (IN_CLASSB(addr))
1480         nmask = IN_CLASSB_NET;
1481     else
1482         nmask = IN_CLASSC_NET;
1483     /* class D nets are disallowed by bad_ip_adrs */
1484     mask = netmask | htonl(nmask);
1485
1486     /*
1487      * Scan through the system's network interfaces.
1488      */
1489 #ifdef SIOCGIFNUM
1490     if (ioctl(ipfd, SIOCGIFNUM, &nif) < 0)
1491 #endif
1492         nif = MAX_IFS;
1493     ifc.ifc_len = nif * sizeof(struct ifreq);
1494     ifc.ifc_buf = (caddr_t) malloc(ifc.ifc_len);
1495     if (ifc.ifc_buf == 0)
1496         return mask;
1497     if (ioctl(ipfd, SIOCGIFCONF, &ifc) < 0) {
1498         syslog(LOG_WARNING, "Couldn't get system interface list: %m");
1499         free(ifc.ifc_buf);
1500         return mask;
1501     }
1502     ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1503     for (ifr = ifc.ifc_req; ifr < ifend; ++ifr) {
1504         /*
1505          * Check the interface's internet address.
1506          */
1507         if (ifr->ifr_addr.sa_family != AF_INET)
1508             continue;
1509         ina = INET_ADDR(ifr->ifr_addr);
1510         if ((ntohl(ina) & nmask) != (addr & nmask))
1511             continue;
1512         /*
1513          * Check that the interface is up, and not point-to-point or loopback.
1514          */
1515         strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1516         if (ioctl(ipfd, SIOCGIFFLAGS, &ifreq) < 0)
1517             continue;
1518         if ((ifreq.ifr_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK))
1519             != IFF_UP)
1520             continue;
1521         /*
1522          * Get its netmask and OR it into our mask.
1523          */
1524         if (ioctl(ipfd, SIOCGIFNETMASK, &ifreq) < 0)
1525             continue;
1526         mask |= INET_ADDR(ifreq.ifr_addr);
1527     }
1528
1529     free(ifc.ifc_buf);
1530     return mask;
1531 }
1532
1533 /*
1534  * logwtmp - write an accounting record to the /var/adm/wtmp file.
1535  */
1536 void
1537 logwtmp(line, name, host)
1538     const char *line, *name, *host;
1539 {
1540     static struct utmpx utmpx;
1541
1542     if (name[0] != 0) {
1543         /* logging in */
1544         strncpy(utmpx.ut_user, name, sizeof(utmpx.ut_user));
1545         strncpy(utmpx.ut_id, ifname, sizeof(utmpx.ut_id));
1546         strncpy(utmpx.ut_line, line, sizeof(utmpx.ut_line));
1547         utmpx.ut_pid = getpid();
1548         utmpx.ut_type = USER_PROCESS;
1549     } else {
1550         utmpx.ut_type = DEAD_PROCESS;
1551     }
1552     gettimeofday(&utmpx.ut_tv, NULL);
1553     updwtmpx("/var/adm/wtmpx", &utmpx);
1554 }
1555
1556 /*
1557  * get_host_seed - return the serial number of this machine.
1558  */
1559 int
1560 get_host_seed()
1561 {
1562     char buf[32];
1563
1564     if (sysinfo(SI_HW_SERIAL, buf, sizeof(buf)) < 0) {
1565         syslog(LOG_ERR, "sysinfo: %m");
1566         return 0;
1567     }
1568     return (int) strtoul(buf, NULL, 16);
1569 }
1570
1571 static int
1572 strioctl(fd, cmd, ptr, ilen, olen)
1573     int fd, cmd, ilen, olen;
1574     void *ptr;
1575 {
1576     struct strioctl str;
1577
1578     str.ic_cmd = cmd;
1579     str.ic_timout = 0;
1580     str.ic_len = ilen;
1581     str.ic_dp = ptr;
1582     if (ioctl(fd, I_STR, &str) == -1)
1583         return -1;
1584     if (str.ic_len != olen)
1585         syslog(LOG_DEBUG, "strioctl: expected %d bytes, got %d for cmd %x\n",
1586                olen, str.ic_len, cmd);
1587     return 0;
1588 }
1589
1590 /*
1591  * lock - create a lock file for the named lock device
1592  */
1593
1594 #define LOCK_PREFIX     "/var/spool/locks/LK."
1595 static char lock_file[40];      /* name of lock file created */
1596
1597 int
1598 lock(dev)
1599     char *dev;
1600 {
1601     int n, fd, pid;
1602     struct stat sbuf;
1603     char ascii_pid[12];
1604
1605     if (stat(dev, &sbuf) < 0) {
1606         syslog(LOG_ERR, "Can't get device number for %s: %m", dev);
1607         return -1;
1608     }
1609     if ((sbuf.st_mode & S_IFMT) != S_IFCHR) {
1610         syslog(LOG_ERR, "Can't lock %s: not a character device", dev);
1611         return -1;
1612     }
1613     sprintf(lock_file, "%s%03d.%03d.%03d", LOCK_PREFIX, major(sbuf.st_dev),
1614             major(sbuf.st_rdev), minor(sbuf.st_rdev));
1615
1616     while ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0) {
1617         if (errno == EEXIST
1618             && (fd = open(lock_file, O_RDONLY, 0)) >= 0) {
1619             /* Read the lock file to find out who has the device locked */
1620             n = read(fd, ascii_pid, 11);
1621             if (n <= 0) {
1622                 syslog(LOG_ERR, "Can't read pid from lock file %s", lock_file);
1623                 close(fd);
1624             } else {
1625                 ascii_pid[n] = 0;
1626                 pid = atoi(ascii_pid);
1627                 if (pid > 0 && kill(pid, 0) == -1 && errno == ESRCH) {
1628                     /* pid no longer exists - remove the lock file */
1629                     if (unlink(lock_file) == 0) {
1630                         close(fd);
1631                         syslog(LOG_NOTICE, "Removed stale lock on %s (pid %d)",
1632                                dev, pid);
1633                         continue;
1634                     } else
1635                         syslog(LOG_WARNING, "Couldn't remove stale lock on %s",
1636                                dev);
1637                 } else
1638                     syslog(LOG_NOTICE, "Device %s is locked by pid %d",
1639                            dev, pid);
1640             }
1641             close(fd);
1642         } else
1643             syslog(LOG_ERR, "Can't create lock file %s: %m", lock_file);
1644         lock_file[0] = 0;
1645         return -1;
1646     }
1647
1648     sprintf(ascii_pid, "%10d\n", getpid());
1649     write(fd, ascii_pid, 11);
1650
1651     close(fd);
1652     return 1;
1653 }
1654
1655 /*
1656  * unlock - remove our lockfile
1657  */
1658 void
1659 unlock()
1660 {
1661     if (lock_file[0]) {
1662         unlink(lock_file);
1663         lock_file[0] = 0;
1664     }
1665 }
1666
1667
1668 /*
1669  * cifroute - delete a route through the addresses given.
1670  */
1671 int
1672 cifroute(u, our, his)
1673     int u;
1674     u_int32_t our, his;
1675 {
1676     struct rtentry rt;
1677
1678     memset(&rt, 0, sizeof(rt));
1679     rt.rt_dst.sa_family = AF_INET;
1680     INET_ADDR(rt.rt_dst) = his;
1681     rt.rt_gateway.sa_family = AF_INET;
1682     INET_ADDR(rt.rt_gateway) = our;
1683     rt.rt_flags = RTF_HOST;
1684
1685     if (ioctl(ipfd, SIOCDELRT, &rt) < 0) {
1686         syslog(LOG_ERR, "Can't delete route: %m");
1687         return 0;
1688     }
1689
1690     return 1;
1691 }