pppd/sys-bsd.c

   1 /*
   2  * sys-bsd.c - System-dependent procedures for setting up
   3  * PPP interfaces on bsd-4.4-ish systems (including 386BSD, NetBSD, etc.)
   4  *
   5  * Copyright (c) 1989 Carnegie Mellon University.
   6  * Copyright (c) 1995 The Australian National University.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms are permitted
  10  * provided that the above copyright notice and this paragraph are
  11  * duplicated in all such forms and that any documentation,
  12  * advertising materials, and other materials related to such
  13  * distribution and use acknowledge that the software was developed
  14  * by Carnegie Mellon University and The Australian National University.
  15  * The names of the Universities may not be used to endorse or promote
  16  * products derived from this software without specific prior written
  17  * permission.
  18  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  20  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  21  */
  22
  23 #define RCSID   "$Id: sys-bsd.c,v 1.47 2000/04/13 12:04:23 paulus Exp $"
  24 /*      $NetBSD: sys-bsd.c,v 1.1.1.3 1997/09/26 18:53:04 christos Exp $ */
  25
  26 /*
  27  * TODO:
  28  */
  29
  30 #include <stdio.h>
  31 #include <string.h>
  32 #include <stdlib.h>
  33 #include <unistd.h>
  34 #include <errno.h>
  35 #include <fcntl.h>
  36 #include <termios.h>
  37 #include <signal.h>
  38 #include <sys/ioctl.h>
  39 #include <sys/types.h>
  40 #include <sys/socket.h>
  41 #include <sys/time.h>
  42 #include <sys/stat.h>
  43 #include <sys/param.h>
  44 #ifdef NetBSD1_2
  45 #include <util.h>
  46 #endif
  47 #ifdef PPP_FILTER
  48 #include <net/bpf.h>
  49 #endif
  50
  51 #include <net/if.h>
  52 #include <net/ppp_defs.h>
  53 #include <net/if_ppp.h>
  54 #include <net/route.h>
  55 #include <net/if_dl.h>
  56 #include <netinet/in.h>
  57
  58 #if RTM_VERSION >= 3
  59 #include <sys/param.h>
  60 #if defined(NetBSD) && (NetBSD >= 199703)
  61 #include <netinet/if_inarp.h>
  62 #else   /* NetBSD 1.2D or later */
  63 #ifdef __FreeBSD__
  64 #include <netinet/if_ether.h>
  65 #else
  66 #include <net/if_ether.h>
  67 #endif
  68 #endif
  69 #endif
  70
  71 #include "pppd.h"
  72 #include "fsm.h"
  73 #include "ipcp.h"
  74
  75 static const char rcsid[] = RCSID;
  76
  77 static int initdisc = -1;       /* Initial TTY discipline for ppp_fd */
  78 static int initfdflags = -1;    /* Initial file descriptor flags for ppp_fd */
  79 static int ppp_fd = -1;         /* fd which is set to PPP discipline */
  80 static int rtm_seq;
  81
  82 static int restore_term;        /* 1 => we've munged the terminal */
  83 static struct termios inittermios; /* Initial TTY termios */
  84 static struct winsize wsinfo;   /* Initial window size info */
  85
  86 static int loop_slave = -1;
  87 static int loop_master;
  88 static char loop_name[20];
  89
  90 static unsigned char inbuf[512]; /* buffer for chars read from loopback */
  91
  92 static int sockfd;              /* socket for doing interface ioctls */
  93
  94 static fd_set in_fds;           /* set of fds that wait_input waits for */
  95 static int max_in_fd;           /* highest fd set in in_fds */
  96
  97 static int if_is_up;            /* the interface is currently up */
  98 static u_int32_t ifaddrs[2];    /* local and remote addresses we set */
  99 static u_int32_t default_route_gateway; /* gateway addr for default route */
 100 static u_int32_t proxy_arp_addr;        /* remote addr for proxy arp */
 101
 102 /* Prototypes for procedures local to this file. */
 103 static int dodefaultroute __P((u_int32_t, int));
 104 static int get_ether_addr __P((u_int32_t, struct sockaddr_dl *));
 105
 106
 107 /*
 108  * sys_init - System-dependent initialization.
 109  */
 110 void
 111 sys_init()
 112 {
 113     /* Get an internet socket for doing socket ioctl's on. */
 114     if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
 115         fatal("Couldn't create IP socket: %m");
 116
 117     FD_ZERO(&in_fds);
 118     max_in_fd = 0;
 119 }
 120
 121 /*
 122  * sys_cleanup - restore any system state we modified before exiting:
 123  * mark the interface down, delete default route and/or proxy arp entry.
 124  * This should call die() because it's called from die().
 125  */
 126 void
 127 sys_cleanup()
 128 {
 129     struct ifreq ifr;
 130
 131     if (if_is_up) {
 132         strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 133         if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) >= 0
 134             && ((ifr.ifr_flags & IFF_UP) != 0)) {
 135             ifr.ifr_flags &= ~IFF_UP;
 136             ioctl(sockfd, SIOCSIFFLAGS, &ifr);
 137         }
 138     }
 139     if (ifaddrs[0] != 0)
 140         cifaddr(0, ifaddrs[0], ifaddrs[1]);
 141     if (default_route_gateway)
 142         cifdefaultroute(0, 0, default_route_gateway);
 143     if (proxy_arp_addr)
 144         cifproxyarp(0, proxy_arp_addr);
 145 }
 146
 147 /*
 148  * sys_close - Clean up in a child process before execing.
 149  */
 150 void
 151 sys_close()
 152 {
 153     close(sockfd);
 154     if (loop_slave >= 0) {
 155         close(loop_slave);
 156         close(loop_master);
 157     }
 158 }
 159
 160 /*
 161  * sys_check_options - check the options that the user specified
 162  */
 163 int
 164 sys_check_options()
 165 {
 166 #ifndef CDTRCTS
 167     if (crtscts == 2) {
 168         warn("DTR/CTS flow control is not supported on this system");
 169         return 0;
 170     }
 171 #endif
 172     return 1;
 173 }
 174
 175 /*
 176  * ppp_available - check whether the system has any ppp interfaces
 177  * (in fact we check whether we can do an ioctl on ppp0).
 178  */
 179 int
 180 ppp_available()
 181 {
 182     int s, ok;
 183     struct ifreq ifr;
 184     extern char *no_ppp_msg;
 185
 186     if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
 187         return 1;               /* can't tell */
 188
 189     strlcpy(ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
 190     ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
 191     close(s);
 192
 193     no_ppp_msg = "\
 194 This system lacks kernel support for PPP.  To include PPP support\n\
 195 in the kernel, please follow the steps detailed in the README.bsd\n\
 196 file in the ppp-2.2 distribution.\n";
 197     return ok;
 198 }
 199
 200 /*
 201  * establish_ppp - Turn the serial port into a ppp interface.
 202  */
 203 int
 204 establish_ppp(fd)
 205     int fd;
 206 {
 207     int pppdisc = PPPDISC;
 208     int x;
 209
 210     if (demand) {
 211         /*
 212          * Demand mode - prime the old ppp device to relinquish the unit.
 213          */
 214         if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0)
 215             fatal("ioctl(transfer ppp unit): %m");
 216     }
 217
 218     /*
 219      * Save the old line discipline of fd, and set it to PPP.
 220      */
 221     if (ioctl(fd, TIOCGETD, &initdisc) < 0)
 222         fatal("ioctl(TIOCGETD): %m");
 223     if (ioctl(fd, TIOCSETD, &pppdisc) < 0)
 224         fatal("ioctl(TIOCSETD): %m");
 225
 226     if (!demand) {
 227         /*
 228          * Find out which interface we were given.
 229          */
 230         if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0)
 231             fatal("ioctl(PPPIOCGUNIT): %m");
 232     } else {
 233         /*
 234          * Check that we got the same unit again.
 235          */
 236         if (ioctl(fd, PPPIOCGUNIT, &x) < 0)
 237             fatal("ioctl(PPPIOCGUNIT): %m");
 238         if (x != ifunit)
 239             fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x);
 240         x = TTYDISC;
 241         ioctl(loop_slave, TIOCSETD, &x);
 242     }
 243
 244     ppp_fd = fd;
 245
 246     /*
 247      * Enable debug in the driver if requested.
 248      */
 249     if (kdebugflag) {
 250         if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
 251             warn("ioctl (PPPIOCGFLAGS): %m");
 252         } else {
 253             x |= (kdebugflag & 0xFF) * SC_DEBUG;
 254             if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
 255                 warn("ioctl(PPPIOCSFLAGS): %m");
 256         }
 257     }
 258
 259     /*
 260      * Set device for non-blocking reads.
 261      */
 262     if ((initfdflags = fcntl(fd, F_GETFL)) == -1
 263         || fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
 264         warn("Couldn't set device to non-blocking mode: %m");
 265     }
 266
 267     return fd;
 268 }
 269
 270 /*
 271  * restore_loop - reattach the ppp unit to the loopback.
 272  */
 273 void
 274 restore_loop()
 275 {
 276     int x;
 277
 278     /*
 279      * Transfer the ppp interface back to the loopback.
 280      */
 281     if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0)
 282         fatal("ioctl(transfer ppp unit): %m");
 283     x = PPPDISC;
 284     if (ioctl(loop_slave, TIOCSETD, &x) < 0)
 285         fatal("ioctl(TIOCSETD): %m");
 286
 287     /*
 288      * Check that we got the same unit again.
 289      */
 290     if (ioctl(loop_slave, PPPIOCGUNIT, &x) < 0)
 291         fatal("ioctl(PPPIOCGUNIT): %m");
 292     if (x != ifunit)
 293         fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x);
 294     ppp_fd = loop_slave;
 295 }
 296
 297
 298 /*
 299  * disestablish_ppp - Restore the serial port to normal operation.
 300  * This shouldn't call die() because it's called from die().
 301  */
 302 void
 303 disestablish_ppp(fd)
 304     int fd;
 305 {
 306     /* Reset non-blocking mode on fd. */
 307     if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0)
 308         warn("Couldn't restore device fd flags: %m");
 309     initfdflags = -1;
 310
 311     /* Restore old line discipline. */
 312     if (initdisc >= 0 && ioctl(fd, TIOCSETD, &initdisc) < 0)
 313         error("ioctl(TIOCSETD): %m");
 314     initdisc = -1;
 315
 316     if (fd == ppp_fd)
 317         ppp_fd = -1;
 318 }
 319
 320 /*
 321  * Check whether the link seems not to be 8-bit clean.
 322  */
 323 void
 324 clean_check()
 325 {
 326     int x;
 327     char *s;
 328
 329     if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
 330         s = NULL;
 331         switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
 332         case SC_RCV_B7_0:
 333             s = "bit 7 set to 1";
 334             break;
 335         case SC_RCV_B7_1:
 336             s = "bit 7 set to 0";
 337             break;
 338         case SC_RCV_EVNP:
 339             s = "odd parity";
 340             break;
 341         case SC_RCV_ODDP:
 342             s = "even parity";
 343             break;
 344         }
 345         if (s != NULL) {
 346             warn("Serial link is not 8-bit clean:");
 347             warn("All received characters had %s", s);
 348         }
 349     }
 350 }
 351
 352 /*
 353  * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
 354  * at the requested speed, etc.  If `local' is true, set CLOCAL
 355  * regardless of whether the modem option was specified.
 356  *
 357  * For *BSD, we assume that speed_t values numerically equal bits/second.
 358  */
 359 void
 360 set_up_tty(fd, local)
 361     int fd, local;
 362 {
 363     struct termios tios;
 364
 365     if (tcgetattr(fd, &tios) < 0)
 366         fatal("tcgetattr: %m");
 367
 368     if (!restore_term) {
 369         inittermios = tios;
 370         ioctl(fd, TIOCGWINSZ, &wsinfo);
 371     }
 372
 373     tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
 374     if (crtscts > 0 && !local) {
 375         if (crtscts == 2) {
 376 #ifdef CDTRCTS
 377             tios.c_cflag |= CDTRCTS;
 378 #endif
 379         } else
 380             tios.c_cflag |= CRTSCTS;
 381     } else if (crtscts < 0) {
 382         tios.c_cflag &= ~CRTSCTS;
 383 #ifdef CDTRCTS
 384         tios.c_cflag &= ~CDTRCTS;
 385 #endif
 386     }
 387
 388     tios.c_cflag |= CS8 | CREAD | HUPCL;
 389     if (local || !modem)
 390         tios.c_cflag |= CLOCAL;
 391     tios.c_iflag = IGNBRK | IGNPAR;
 392     tios.c_oflag = 0;
 393     tios.c_lflag = 0;
 394     tios.c_cc[VMIN] = 1;
 395     tios.c_cc[VTIME] = 0;
 396
 397     if (crtscts == -2) {
 398         tios.c_iflag |= IXON | IXOFF;
 399         tios.c_cc[VSTOP] = 0x13;        /* DC3 = XOFF = ^S */
 400         tios.c_cc[VSTART] = 0x11;       /* DC1 = XON  = ^Q */
 401     }
 402
 403     if (inspeed) {
 404         cfsetospeed(&tios, inspeed);
 405         cfsetispeed(&tios, inspeed);
 406     } else {
 407         inspeed = cfgetospeed(&tios);
 408         /*
 409          * We can't proceed if the serial port speed is 0,
 410          * since that implies that the serial port is disabled.
 411          */
 412         if (inspeed == 0)
 413             fatal("Baud rate for %s is 0; need explicit baud rate", devnam);
 414     }
 415     baud_rate = inspeed;
 416
 417     if (tcsetattr(fd, TCSAFLUSH, &tios) < 0)
 418         fatal("tcsetattr: %m");
 419
 420     restore_term = 1;
 421 }
 422
 423 /*
 424  * restore_tty - restore the terminal to the saved settings.
 425  */
 426 void
 427 restore_tty(fd)
 428     int fd;
 429 {
 430     if (restore_term) {
 431         if (!default_device) {
 432             /*
 433              * Turn off echoing, because otherwise we can get into
 434              * a loop with the tty and the modem echoing to each other.
 435              * We presume we are the sole user of this tty device, so
 436              * when we close it, it will revert to its defaults anyway.
 437              */
 438             inittermios.c_lflag &= ~(ECHO | ECHONL);
 439         }
 440         if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
 441             if (errno != ENXIO)
 442                 warn("tcsetattr: %m");
 443         ioctl(fd, TIOCSWINSZ, &wsinfo);
 444         restore_term = 0;
 445     }
 446 }
 447
 448 /*
 449  * setdtr - control the DTR line on the serial port.
 450  * This is called from die(), so it shouldn't call die().
 451  */
 452 void
 453 setdtr(fd, on)
 454 int fd, on;
 455 {
 456     int modembits = TIOCM_DTR;
 457
 458     ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
 459 }
 460
 461 /*
 462  * get_pty - get a pty master/slave pair and chown the slave side
 463  * to the uid given.  Assumes slave_name points to >= 12 bytes of space.
 464  */
 465 int
 466 get_pty(master_fdp, slave_fdp, slave_name, uid)
 467     int *master_fdp;
 468     int *slave_fdp;
 469     char *slave_name;
 470     int uid;
 471 {
 472     struct termios tios;
 473
 474     if (openpty(master_fdp, slave_fdp, slave_name, NULL, NULL) < 0)
 475         return 0;
 476
 477     fchown(*slave_fdp, uid, -1);
 478     fchmod(*slave_fdp, S_IRUSR | S_IWUSR);
 479     if (tcgetattr(*slave_fdp, &tios) == 0) {
 480         tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
 481         tios.c_cflag |= CS8 | CREAD;
 482         tios.c_iflag  = IGNPAR | CLOCAL;
 483         tios.c_oflag  = 0;
 484         tios.c_lflag  = 0;
 485         if (tcsetattr(*slave_fdp, TCSAFLUSH, &tios) < 0)
 486             warn("couldn't set attributes on pty: %m");
 487     } else
 488         warn("couldn't get attributes on pty: %m");
 489
 490     return 1;
 491 }
 492
 493
 494 /*
 495  * open_ppp_loopback - open the device we use for getting
 496  * packets in demand mode, and connect it to a ppp interface.
 497  * Here we use a pty.
 498  */
 499 int
 500 open_ppp_loopback()
 501 {
 502     int flags;
 503     struct termios tios;
 504     int pppdisc = PPPDISC;
 505
 506     if (openpty(&loop_master, &loop_slave, loop_name, NULL, NULL) < 0)
 507         fatal("No free pty for loopback");
 508     SYSDEBUG(("using %s for loopback", loop_name));
 509
 510     if (tcgetattr(loop_slave, &tios) == 0) {
 511         tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
 512         tios.c_cflag |= CS8 | CREAD;
 513         tios.c_iflag = IGNPAR;
 514         tios.c_oflag = 0;
 515         tios.c_lflag = 0;
 516         if (tcsetattr(loop_slave, TCSAFLUSH, &tios) < 0)
 517             warn("couldn't set attributes on loopback: %m");
 518     }
 519
 520     if ((flags = fcntl(loop_master, F_GETFL)) != -1)
 521         if (fcntl(loop_master, F_SETFL, flags | O_NONBLOCK) == -1)
 522             warn("couldn't set loopback to nonblock: %m");
 523
 524     ppp_fd = loop_slave;
 525     if (ioctl(ppp_fd, TIOCSETD, &pppdisc) < 0)
 526         fatal("ioctl(TIOCSETD): %m");
 527
 528     /*
 529      * Find out which interface we were given.
 530      */
 531     if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0)
 532         fatal("ioctl(PPPIOCGUNIT): %m");
 533
 534     /*
 535      * Enable debug in the driver if requested.
 536      */
 537     if (kdebugflag) {
 538         if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &flags) < 0) {
 539             warn("ioctl (PPPIOCGFLAGS): %m");
 540         } else {
 541             flags |= (kdebugflag & 0xFF) * SC_DEBUG;
 542             if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0)
 543                 warn("ioctl(PPPIOCSFLAGS): %m");
 544         }
 545     }
 546
 547     return loop_master;
 548 }
 549
 550
 551 /*
 552  * output - Output PPP packet.
 553  */
 554 void
 555 output(unit, p, len)
 556     int unit;
 557     u_char *p;
 558     int len;
 559 {
 560     if (debug)
 561         dbglog("sent %P", p, len);
 562
 563     if (write(ttyfd, p, len) < 0) {
 564         if (errno != EIO)
 565             error("write: %m");
 566     }
 567 }
 568
 569
 570 /*
 571  * wait_input - wait until there is data available,
 572  * for the length of time specified by *timo (indefinite
 573  * if timo is NULL).
 574  */
 575 void
 576 wait_input(timo)
 577     struct timeval *timo;
 578 {
 579     fd_set ready;
 580     int n;
 581
 582     ready = in_fds;
 583     n = select(max_in_fd + 1, &ready, NULL, &ready, timo);
 584     if (n < 0 && errno != EINTR)
 585         fatal("select: %m");
 586 }
 587
 588
 589 /*
 590  * add_fd - add an fd to the set that wait_input waits for.
 591  */
 592 void add_fd(fd)
 593     int fd;
 594 {
 595     FD_SET(fd, &in_fds);
 596     if (fd > max_in_fd)
 597         max_in_fd = fd;
 598 }
 599
 600 /*
 601  * remove_fd - remove an fd from the set that wait_input waits for.
 602  */
 603 void remove_fd(fd)
 604     int fd;
 605 {
 606     FD_CLR(fd, &in_fds);
 607 }
 608
 609 #if 0
 610 /*
 611  * wait_loop_output - wait until there is data available on the
 612  * loopback, for the length of time specified by *timo (indefinite
 613  * if timo is NULL).
 614  */
 615 void
 616 wait_loop_output(timo)
 617     struct timeval *timo;
 618 {
 619     fd_set ready;
 620     int n;
 621
 622     FD_ZERO(&ready);
 623     FD_SET(loop_master, &ready);
 624     n = select(loop_master + 1, &ready, NULL, &ready, timo);
 625     if (n < 0 && errno != EINTR)
 626         fatal("select: %m");
 627 }
 628
 629
 630 /*
 631  * wait_time - wait for a given length of time or until a
 632  * signal is received.
 633  */
 634 void
 635 wait_time(timo)
 636     struct timeval *timo;
 637 {
 638     int n;
 639
 640     n = select(0, NULL, NULL, NULL, timo);
 641     if (n < 0 && errno != EINTR)
 642         fatal("select: %m");
 643 }
 644 #endif
 645
 646
 647 /*
 648  * read_packet - get a PPP packet from the serial device.
 649  */
 650 int
 651 read_packet(buf)
 652     u_char *buf;
 653 {
 654     int len;
 655
 656     if ((len = read(ttyfd, buf, PPP_MTU + PPP_HDRLEN)) < 0) {
 657         if (errno == EWOULDBLOCK || errno == EINTR)
 658             return -1;
 659         fatal("read: %m");
 660     }
 661     return len;
 662 }
 663
 664
 665 /*
 666  * get_loop_output - read characters from the loopback, form them
 667  * into frames, and detect when we want to bring the real link up.
 668  * Return value is 1 if we need to bring up the link, 0 otherwise.
 669  */
 670 int
 671 get_loop_output()
 672 {
 673     int rv = 0;
 674     int n;
 675
 676     while ((n = read(loop_master, inbuf, sizeof(inbuf))) >= 0) {
 677         if (loop_chars(inbuf, n))
 678             rv = 1;
 679     }
 680
 681     if (n == 0)
 682         fatal("eof on loopback");
 683     if (errno != EWOULDBLOCK)
 684         fatal("read from loopback: %m");
 685
 686     return rv;
 687 }
 688
 689
 690 /*
 691  * ppp_send_config - configure the transmit characteristics of
 692  * the ppp interface.
 693  */
 694 void
 695 ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
 696     int unit, mtu;
 697     u_int32_t asyncmap;
 698     int pcomp, accomp;
 699 {
 700     u_int x;
 701     struct ifreq ifr;
 702
 703     strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
 704     ifr.ifr_mtu = mtu;
 705     if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
 706         fatal("ioctl(SIOCSIFMTU): %m");
 707
 708     if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0)
 709         fatal("ioctl(PPPIOCSASYNCMAP): %m");
 710
 711     if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0)
 712         fatal("ioctl (PPPIOCGFLAGS): %m");
 713     x = pcomp? x | SC_COMP_PROT: x &~ SC_COMP_PROT;
 714     x = accomp? x | SC_COMP_AC: x &~ SC_COMP_AC;
 715     x = sync_serial ? x | SC_SYNC : x & ~SC_SYNC;
 716     if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
 717         fatal("ioctl(PPPIOCSFLAGS): %m");
 718 }
 719
 720
 721 /*
 722  * ppp_set_xaccm - set the extended transmit ACCM for the interface.
 723  */
 724 void
 725 ppp_set_xaccm(unit, accm)
 726     int unit;
 727     ext_accm accm;
 728 {
 729     if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
 730         warn("ioctl(set extended ACCM): %m");
 731 }
 732
 733
 734 /*
 735  * ppp_recv_config - configure the receive-side characteristics of
 736  * the ppp interface.
 737  */
 738 void
 739 ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
 740     int unit, mru;
 741     u_int32_t asyncmap;
 742     int pcomp, accomp;
 743 {
 744     int x;
 745
 746     if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0)
 747         fatal("ioctl(PPPIOCSMRU): %m");
 748     if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0)
 749         fatal("ioctl(PPPIOCSRASYNCMAP): %m");
 750     if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0)
 751         fatal("ioctl (PPPIOCGFLAGS): %m");
 752     x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
 753     if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
 754         fatal("ioctl(PPPIOCSFLAGS): %m");
 755 }
 756
 757 /*
 758  * ccp_test - ask kernel whether a given compression method
 759  * is acceptable for use.  Returns 1 if the method and parameters
 760  * are OK, 0 if the method is known but the parameters are not OK
 761  * (e.g. code size should be reduced), or -1 if the method is unknown.
 762  */
 763 int
 764 ccp_test(unit, opt_ptr, opt_len, for_transmit)
 765     int unit, opt_len, for_transmit;
 766     u_char *opt_ptr;
 767 {
 768     struct ppp_option_data data;
 769
 770     data.ptr = opt_ptr;
 771     data.length = opt_len;
 772     data.transmit = for_transmit;
 773     if (ioctl(ttyfd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
 774         return 1;
 775     return (errno == ENOBUFS)? 0: -1;
 776 }
 777
 778 /*
 779  * ccp_flags_set - inform kernel about the current state of CCP.
 780  */
 781 void
 782 ccp_flags_set(unit, isopen, isup)
 783     int unit, isopen, isup;
 784 {
 785     int x;
 786
 787     if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
 788         error("ioctl (PPPIOCGFLAGS): %m");
 789         return;
 790     }
 791     x = isopen? x | SC_CCP_OPEN: x &~ SC_CCP_OPEN;
 792     x = isup? x | SC_CCP_UP: x &~ SC_CCP_UP;
 793     if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
 794         error("ioctl(PPPIOCSFLAGS): %m");
 795 }
 796
 797 /*
 798  * ccp_fatal_error - returns 1 if decompression was disabled as a
 799  * result of an error detected after decompression of a packet,
 800  * 0 otherwise.  This is necessary because of patent nonsense.
 801  */
 802 int
 803 ccp_fatal_error(unit)
 804     int unit;
 805 {
 806     int x;
 807
 808     if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
 809         error("ioctl(PPPIOCGFLAGS): %m");
 810         return 0;
 811     }
 812     return x & SC_DC_FERROR;
 813 }
 814
 815 /*
 816  * get_idle_time - return how long the link has been idle.
 817  */
 818 int
 819 get_idle_time(u, ip)
 820     int u;
 821     struct ppp_idle *ip;
 822 {
 823     return ioctl(ppp_fd, PPPIOCGIDLE, ip) >= 0;
 824 }
 825
 826 /*
 827  * get_ppp_stats - return statistics for the link.
 828  */
 829 int
 830 get_ppp_stats(u, stats)
 831     int u;
 832     struct pppd_stats *stats;
 833 {
 834     struct ifpppstatsreq req;
 835
 836     memset (&req, 0, sizeof (req));
 837     strlcpy(req.ifr_name, ifname, sizeof(req.ifr_name));
 838     if (ioctl(sockfd, SIOCGPPPSTATS, &req) < 0) {
 839         error("Couldn't get PPP statistics: %m");
 840         return 0;
 841     }
 842     stats->bytes_in = req.stats.p.ppp_ibytes;
 843     stats->bytes_out = req.stats.p.ppp_obytes;
 844     return 1;
 845 }
 846
 847
 848 #ifdef PPP_FILTER
 849 /*
 850  * set_filters - transfer the pass and active filters to the kernel.
 851  */
 852 int
 853 set_filters(pass, active)
 854     struct bpf_program *pass, *active;
 855 {
 856     int ret = 1;
 857
 858     if (pass->bf_len > 0) {
 859         if (ioctl(ppp_fd, PPPIOCSPASS, pass) < 0) {
 860             error("Couldn't set pass-filter in kernel: %m");
 861             ret = 0;
 862         }
 863     }
 864     if (active->bf_len > 0) {
 865         if (ioctl(ppp_fd, PPPIOCSACTIVE, active) < 0) {
 866             error("Couldn't set active-filter in kernel: %m");
 867             ret = 0;
 868         }
 869     }
 870     return ret;
 871 }
 872 #endif
 873
 874 /*
 875  * sifvjcomp - config tcp header compression
 876  */
 877 int
 878 sifvjcomp(u, vjcomp, cidcomp, maxcid)
 879     int u, vjcomp, cidcomp, maxcid;
 880 {
 881     u_int x;
 882
 883     if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
 884         error("ioctl (PPPIOCGFLAGS): %m");
 885         return 0;
 886     }
 887     x = vjcomp ? x | SC_COMP_TCP: x &~ SC_COMP_TCP;
 888     x = cidcomp? x & ~SC_NO_TCP_CCID: x | SC_NO_TCP_CCID;
 889     if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
 890         error("ioctl(PPPIOCSFLAGS): %m");
 891         return 0;
 892     }
 893     if (vjcomp && ioctl(ppp_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
 894         error("ioctl(PPPIOCSFLAGS): %m");
 895         return 0;
 896     }
 897     return 1;
 898 }
 899
 900 /*
 901  * sifup - Config the interface up and enable IP packets to pass.
 902  */
 903 int
 904 sifup(u)
 905     int u;
 906 {
 907     struct ifreq ifr;
 908
 909     strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
 910     if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
 911         error("ioctl (SIOCGIFFLAGS): %m");
 912         return 0;
 913     }
 914     ifr.ifr_flags |= IFF_UP;
 915     if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
 916         error("ioctl(SIOCSIFFLAGS): %m");
 917         return 0;
 918     }
 919     if_is_up = 1;
 920     return 1;
 921 }
 922
 923 /*
 924  * sifnpmode - Set the mode for handling packets for a given NP.
 925  */
 926 int
 927 sifnpmode(u, proto, mode)
 928     int u;
 929     int proto;
 930     enum NPmode mode;
 931 {
 932     struct npioctl npi;
 933
 934     npi.protocol = proto;
 935     npi.mode = mode;
 936     if (ioctl(ppp_fd, PPPIOCSNPMODE, &npi) < 0) {
 937         error("ioctl(set NP %d mode to %d): %m", proto, mode);
 938         return 0;
 939     }
 940     return 1;
 941 }
 942
 943 /*
 944  * sifdown - Config the interface down and disable IP.
 945  */
 946 int
 947 sifdown(u)
 948     int u;
 949 {
 950     struct ifreq ifr;
 951     int rv;
 952     struct npioctl npi;
 953
 954     rv = 1;
 955     npi.protocol = PPP_IP;
 956     npi.mode = NPMODE_ERROR;
 957     ioctl(ppp_fd, PPPIOCSNPMODE, (caddr_t) &npi);
 958     /* ignore errors, because ppp_fd might have been closed by now. */
 959
 960     strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
 961     if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
 962         error("ioctl (SIOCGIFFLAGS): %m");
 963         rv = 0;
 964     } else {
 965         ifr.ifr_flags &= ~IFF_UP;
 966         if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
 967             error("ioctl(SIOCSIFFLAGS): %m");
 968             rv = 0;
 969         } else
 970             if_is_up = 0;
 971     }
 972     return rv;
 973 }
 974
 975 /*
 976  * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
 977  * if it exists.
 978  */
 979 #define SET_SA_FAMILY(addr, family)             \
 980     BZERO((char *) &(addr), sizeof(addr));      \
 981     addr.sa_family = (family);                  \
 982     addr.sa_len = sizeof(addr);
 983
 984 /*
 985  * sifaddr - Config the interface IP addresses and netmask.
 986  */
 987 int
 988 sifaddr(u, o, h, m)
 989     int u;
 990     u_int32_t o, h, m;
 991 {
 992     struct ifaliasreq ifra;
 993     struct ifreq ifr;
 994
 995     strlcpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
 996     SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
 997     ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
 998     SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
 999     ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
1000     if (m != 0) {
1001         SET_SA_FAMILY(ifra.ifra_mask, AF_INET);
1002         ((struct sockaddr_in *) &ifra.ifra_mask)->sin_addr.s_addr = m;
1003     } else
1004         BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
1005     BZERO(&ifr, sizeof(ifr));
1006     strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
1007     if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifr) < 0) {
1008         if (errno != EADDRNOTAVAIL)
1009             warn("Couldn't remove interface address: %m");
1010     }
1011     if (ioctl(sockfd, SIOCAIFADDR, (caddr_t) &ifra) < 0) {
1012         if (errno != EEXIST) {
1013             error("Couldn't set interface address: %m");
1014             return 0;
1015         }
1016         warn("Couldn't set interface address: Address %I already exists", o);
1017     }
1018     ifaddrs[0] = o;
1019     ifaddrs[1] = h;
1020     return 1;
1021 }
1022
1023 /*
1024  * cifaddr - Clear the interface IP addresses, and delete routes
1025  * through the interface if possible.
1026  */
1027 int
1028 cifaddr(u, o, h)
1029     int u;
1030     u_int32_t o, h;
1031 {
1032     struct ifaliasreq ifra;
1033
1034     ifaddrs[0] = 0;
1035     strlcpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
1036     SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
1037     ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
1038     SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
1039     ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
1040     BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
1041     if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifra) < 0) {
1042         if (errno != EADDRNOTAVAIL)
1043             warn("Couldn't delete interface address: %m");
1044         return 0;
1045     }
1046     return 1;
1047 }
1048
1049 /*
1050  * sifdefaultroute - assign a default route through the address given.
1051  */
1052 int
1053 sifdefaultroute(u, l, g)
1054     int u;
1055     u_int32_t l, g;
1056 {
1057     return dodefaultroute(g, 's');
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     return dodefaultroute(g, 'c');
1069 }
1070
1071 /*
1072  * dodefaultroute - talk to a routing socket to add/delete a default route.
1073  */
1074 static int
1075 dodefaultroute(g, cmd)
1076     u_int32_t g;
1077     int cmd;
1078 {
1079     int routes;
1080     struct {
1081         struct rt_msghdr        hdr;
1082         struct sockaddr_in      dst;
1083         struct sockaddr_in      gway;
1084         struct sockaddr_in      mask;
1085     } rtmsg;
1086
1087     if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1088         error("Couldn't %s default route: socket: %m",
1089                cmd=='s'? "add": "delete");
1090         return 0;
1091     }
1092
1093     memset(&rtmsg, 0, sizeof(rtmsg));
1094     rtmsg.hdr.rtm_type = cmd == 's'? RTM_ADD: RTM_DELETE;
1095     rtmsg.hdr.rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC;
1096     rtmsg.hdr.rtm_version = RTM_VERSION;
1097     rtmsg.hdr.rtm_seq = ++rtm_seq;
1098     rtmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
1099     rtmsg.dst.sin_len = sizeof(rtmsg.dst);
1100     rtmsg.dst.sin_family = AF_INET;
1101     rtmsg.gway.sin_len = sizeof(rtmsg.gway);
1102     rtmsg.gway.sin_family = AF_INET;
1103     rtmsg.gway.sin_addr.s_addr = g;
1104     rtmsg.mask.sin_len = sizeof(rtmsg.dst);
1105     rtmsg.mask.sin_family = AF_INET;
1106
1107     rtmsg.hdr.rtm_msglen = sizeof(rtmsg);
1108     if (write(routes, &rtmsg, sizeof(rtmsg)) < 0) {
1109         error("Couldn't %s default route: %m",
1110                cmd=='s'? "add": "delete");
1111         close(routes);
1112         return 0;
1113     }
1114
1115     close(routes);
1116     default_route_gateway = (cmd == 's')? g: 0;
1117     return 1;
1118 }
1119
1120 #if RTM_VERSION >= 3
1121
1122 /*
1123  * sifproxyarp - Make a proxy ARP entry for the peer.
1124  */
1125 static struct {
1126     struct rt_msghdr            hdr;
1127     struct sockaddr_inarp       dst;
1128     struct sockaddr_dl          hwa;
1129     char                        extra[128];
1130 } arpmsg;
1131
1132 static int arpmsg_valid;
1133
1134 int
1135 sifproxyarp(unit, hisaddr)
1136     int unit;
1137     u_int32_t hisaddr;
1138 {
1139     int routes;
1140
1141     /*
1142      * Get the hardware address of an interface on the same subnet
1143      * as our local address.
1144      */
1145     memset(&arpmsg, 0, sizeof(arpmsg));
1146     if (!get_ether_addr(hisaddr, &arpmsg.hwa)) {
1147         error("Cannot determine ethernet address for proxy ARP");
1148         return 0;
1149     }
1150
1151     if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1152         error("Couldn't add proxy arp entry: socket: %m");
1153         return 0;
1154     }
1155
1156     arpmsg.hdr.rtm_type = RTM_ADD;
1157     arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
1158     arpmsg.hdr.rtm_version = RTM_VERSION;
1159     arpmsg.hdr.rtm_seq = ++rtm_seq;
1160     arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
1161     arpmsg.hdr.rtm_inits = RTV_EXPIRE;
1162     arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
1163     arpmsg.dst.sin_family = AF_INET;
1164     arpmsg.dst.sin_addr.s_addr = hisaddr;
1165     arpmsg.dst.sin_other = SIN_PROXY;
1166
1167     arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
1168         + arpmsg.hwa.sdl_len;
1169     if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
1170         error("Couldn't add proxy arp entry: %m");
1171         close(routes);
1172         return 0;
1173     }
1174
1175     close(routes);
1176     arpmsg_valid = 1;
1177     proxy_arp_addr = hisaddr;
1178     return 1;
1179 }
1180
1181 /*
1182  * cifproxyarp - Delete the proxy ARP entry for the peer.
1183  */
1184 int
1185 cifproxyarp(unit, hisaddr)
1186     int unit;
1187     u_int32_t hisaddr;
1188 {
1189     int routes;
1190
1191     if (!arpmsg_valid)
1192         return 0;
1193     arpmsg_valid = 0;
1194
1195     arpmsg.hdr.rtm_type = RTM_DELETE;
1196     arpmsg.hdr.rtm_seq = ++rtm_seq;
1197
1198     if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1199         error("Couldn't delete proxy arp entry: socket: %m");
1200         return 0;
1201     }
1202
1203     if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
1204         error("Couldn't delete proxy arp entry: %m");
1205         close(routes);
1206         return 0;
1207     }
1208
1209     close(routes);
1210     proxy_arp_addr = 0;
1211     return 1;
1212 }
1213
1214 #else   /* RTM_VERSION */
1215
1216 /*
1217  * sifproxyarp - Make a proxy ARP entry for the peer.
1218  */
1219 int
1220 sifproxyarp(unit, hisaddr)
1221     int unit;
1222     u_int32_t hisaddr;
1223 {
1224     struct arpreq arpreq;
1225     struct {
1226         struct sockaddr_dl      sdl;
1227         char                    space[128];
1228     } dls;
1229
1230     BZERO(&arpreq, sizeof(arpreq));
1231
1232     /*
1233      * Get the hardware address of an interface on the same subnet
1234      * as our local address.
1235      */
1236     if (!get_ether_addr(hisaddr, &dls.sdl)) {
1237         error("Cannot determine ethernet address for proxy ARP");
1238         return 0;
1239     }
1240
1241     arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
1242     arpreq.arp_ha.sa_family = AF_UNSPEC;
1243     BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen);
1244     SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1245     ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
1246     arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1247     if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0) {
1248         error("Couldn't add proxy arp entry: %m");
1249         return 0;
1250     }
1251
1252     proxy_arp_addr = hisaddr;
1253     return 1;
1254 }
1255
1256 /*
1257  * cifproxyarp - Delete the proxy ARP entry for the peer.
1258  */
1259 int
1260 cifproxyarp(unit, hisaddr)
1261     int unit;
1262     u_int32_t hisaddr;
1263 {
1264     struct arpreq arpreq;
1265
1266     BZERO(&arpreq, sizeof(arpreq));
1267     SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1268     ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
1269     if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) {
1270         warn("Couldn't delete proxy arp entry: %m");
1271         return 0;
1272     }
1273     proxy_arp_addr = 0;
1274     return 1;
1275 }
1276 #endif  /* RTM_VERSION */
1277
1278
1279 /*
1280  * get_ether_addr - get the hardware address of an interface on the
1281  * the same subnet as ipaddr.
1282  */
1283 #define MAX_IFS         32
1284
1285 static int
1286 get_ether_addr(ipaddr, hwaddr)
1287     u_int32_t ipaddr;
1288     struct sockaddr_dl *hwaddr;
1289 {
1290     struct ifreq *ifr, *ifend, *ifp;
1291     u_int32_t ina, mask;
1292     struct sockaddr_dl *dla;
1293     struct ifreq ifreq;
1294     struct ifconf ifc;
1295     struct ifreq ifs[MAX_IFS];
1296
1297     ifc.ifc_len = sizeof(ifs);
1298     ifc.ifc_req = ifs;
1299     if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1300         error("ioctl(SIOCGIFCONF): %m");
1301         return 0;
1302     }
1303
1304     /*
1305      * Scan through looking for an interface with an Internet
1306      * address on the same subnet as `ipaddr'.
1307      */
1308     ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1309     for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
1310                 ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
1311         if (ifr->ifr_addr.sa_family == AF_INET) {
1312             ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1313             strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1314             /*
1315              * Check that the interface is up, and not point-to-point
1316              * or loopback.
1317              */
1318             if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1319                 continue;
1320             if ((ifreq.ifr_flags &
1321                  (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
1322                  != (IFF_UP|IFF_BROADCAST))
1323                 continue;
1324             /*
1325              * Get its netmask and check that it's on the right subnet.
1326              */
1327             if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1328                 continue;
1329             mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
1330             if ((ipaddr & mask) != (ina & mask))
1331                 continue;
1332
1333             break;
1334         }
1335     }
1336
1337     if (ifr >= ifend)
1338         return 0;
1339     info("found interface %s for proxy arp", ifr->ifr_name);
1340
1341     /*
1342      * Now scan through again looking for a link-level address
1343      * for this interface.
1344      */
1345     ifp = ifr;
1346     for (ifr = ifc.ifc_req; ifr < ifend; ) {
1347         if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
1348             && ifr->ifr_addr.sa_family == AF_LINK) {
1349             /*
1350              * Found the link-level address - copy it out
1351              */
1352             dla = (struct sockaddr_dl *) &ifr->ifr_addr;
1353             BCOPY(dla, hwaddr, dla->sdl_len);
1354             return 1;
1355         }
1356         ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
1357     }
1358
1359     return 0;
1360 }
1361
1362 /*
1363  * Return user specified netmask, modified by any mask we might determine
1364  * for address `addr' (in network byte order).
1365  * Here we scan through the system's list of interfaces, looking for
1366  * any non-point-to-point interfaces which might appear to be on the same
1367  * network as `addr'.  If we find any, we OR in their netmask to the
1368  * user-specified netmask.
1369  */
1370 u_int32_t
1371 GetMask(addr)
1372     u_int32_t addr;
1373 {
1374     u_int32_t mask, nmask, ina;
1375     struct ifreq *ifr, *ifend, ifreq;
1376     struct ifconf ifc;
1377     struct ifreq ifs[MAX_IFS];
1378
1379     addr = ntohl(addr);
1380     if (IN_CLASSA(addr))        /* determine network mask for address class */
1381         nmask = IN_CLASSA_NET;
1382     else if (IN_CLASSB(addr))
1383         nmask = IN_CLASSB_NET;
1384     else
1385         nmask = IN_CLASSC_NET;
1386     /* class D nets are disallowed by bad_ip_adrs */
1387     mask = netmask | htonl(nmask);
1388
1389     /*
1390      * Scan through the system's network interfaces.
1391      */
1392     ifc.ifc_len = sizeof(ifs);
1393     ifc.ifc_req = ifs;
1394     if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1395         warn("ioctl(SIOCGIFCONF): %m");
1396         return mask;
1397     }
1398     ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1399     for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
1400                 ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
1401         /*
1402          * Check the interface's internet address.
1403          */
1404         if (ifr->ifr_addr.sa_family != AF_INET)
1405             continue;
1406         ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1407         if ((ntohl(ina) & nmask) != (addr & nmask))
1408             continue;
1409         /*
1410          * Check that the interface is up, and not point-to-point or loopback.
1411          */
1412         strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1413         if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1414             continue;
1415         if ((ifreq.ifr_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK))
1416             != IFF_UP)
1417             continue;
1418         /*
1419          * Get its netmask and OR it into our mask.
1420          */
1421         if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1422             continue;
1423         mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr;
1424     }
1425
1426     return mask;
1427 }
1428
1429 /*
1430  * have_route_to - determine if the system has any route to
1431  * a given IP address.
1432  * For demand mode to work properly, we have to ignore routes
1433  * through our own interface.
1434  */
1435 int have_route_to(u_int32_t addr)
1436 {
1437     return -1;
1438 }
1439
1440 /*
1441  * Use the hostid as part of the random number seed.
1442  */
1443 int
1444 get_host_seed()
1445 {
1446     return gethostid();
1447 }
1448
1449 #if 0
1450 /*
1451  * lock - create a lock file for the named lock device
1452  */
1453 #define LOCK_PREFIX     "/var/spool/lock/LCK.."
1454
1455 static char *lock_file;         /* name of lock file created */
1456
1457 int
1458 lock(dev)
1459     char *dev;
1460 {
1461     char hdb_lock_buffer[12];
1462     int fd, pid, n;
1463     char *p;
1464     size_t l;
1465
1466     if ((p = strrchr(dev, '/')) != NULL)
1467         dev = p + 1;
1468     l = strlen(LOCK_PREFIX) + strlen(dev) + 1;
1469     lock_file = malloc(l);
1470     if (lock_file == NULL)
1471         novm("lock file name");
1472     slprintf(lock_file, l, "%s%s", LOCK_PREFIX, dev);
1473
1474     while ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0) {
1475         if (errno == EEXIST
1476             && (fd = open(lock_file, O_RDONLY, 0)) >= 0) {
1477             /* Read the lock file to find out who has the device locked */
1478             n = read(fd, hdb_lock_buffer, 11);
1479             if (n <= 0) {
1480                 error("Can't read pid from lock file %s", lock_file);
1481                 close(fd);
1482             } else {
1483                 hdb_lock_buffer[n] = 0;
1484                 pid = atoi(hdb_lock_buffer);
1485                 if (kill(pid, 0) == -1 && errno == ESRCH) {
1486                     /* pid no longer exists - remove the lock file */
1487                     if (unlink(lock_file) == 0) {
1488                         close(fd);
1489                         notice("Removed stale lock on %s (pid %d)",
1490                                dev, pid);
1491                         continue;
1492                     } else
1493                         warn("Couldn't remove stale lock on %s",
1494                                dev);
1495                 } else
1496                     notice("Device %s is locked by pid %d",
1497                            dev, pid);
1498             }
1499             close(fd);
1500         } else
1501             error("Can't create lock file %s: %m", lock_file);
1502         free(lock_file);
1503         lock_file = NULL;
1504         return -1;
1505     }
1506
1507     slprintf(hdb_lock_buffer, sizeof(hdb_lock_buffer), "%10d\n", getpid());
1508     write(fd, hdb_lock_buffer, 11);
1509
1510     close(fd);
1511     return 0;
1512 }
1513
1514 /*
1515  * unlock - remove our lockfile
1516  */
1517 void
1518 unlock()
1519 {
1520     if (lock_file) {
1521         unlink(lock_file);
1522         free(lock_file);
1523         lock_file = NULL;
1524     }
1525 }
1526 #endif