1/* 2 * sys-linux.c - System-dependent procedures for setting up 3 * PPP interfaces on Linux systems 4 * 5 * Copyright (c) 1994-2004 Paul Mackerras. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 14 * 2. The name(s) of the authors of this software must not be used to 15 * endorse or promote products derived from this software without 16 * prior written permission. 17 * 18 * 3. Redistributions of any form whatsoever must retain the following 19 * acknowledgment: 20 * "This product includes software developed by Paul Mackerras 21 * <paulus@samba.org>". 22 * 23 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO 24 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 25 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY 26 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 27 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 28 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 29 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 30 * 31 * Derived from main.c and pppd.h, which are: 32 * 33 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved. 34 * 35 * Redistribution and use in source and binary forms, with or without 36 * modification, are permitted provided that the following conditions 37 * are met: 38 * 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in 44 * the documentation and/or other materials provided with the 45 * distribution. 46 * 47 * 3. The name "Carnegie Mellon University" must not be used to 48 * endorse or promote products derived from this software without 49 * prior written permission. For permission or any legal 50 * details, please contact 51 * Office of Technology Transfer 52 * Carnegie Mellon University 53 * 5000 Forbes Avenue 54 * Pittsburgh, PA 15213-3890 55 * (412) 268-4387, fax: (412) 268-7395 56 * tech-transfer@andrew.cmu.edu 57 * 58 * 4. Redistributions of any form whatsoever must retain the following 59 * acknowledgment: 60 * "This product includes software developed by Computing Services 61 * at Carnegie Mellon University (http://www.cmu.edu/computing/)." 62 * 63 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO 64 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 65 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE 66 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 67 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 68 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 69 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 70 */ 71 72#include <sys/ioctl.h> 73#include <sys/types.h> 74#include <sys/socket.h> 75#include <sys/time.h> 76#include <sys/errno.h> 77#include <sys/file.h> 78#include <sys/stat.h> 79#include <sys/utsname.h> 80#include <sys/sysmacros.h> 81 82#include <stdio.h> 83#include <stdlib.h> 84#include <syslog.h> 85#include <string.h> 86#include <time.h> 87#include <memory.h> 88#include <utmp.h> 89#include <mntent.h> 90#include <signal.h> 91#include <fcntl.h> 92#include <ctype.h> 93#include <termios.h> 94#include <unistd.h> 95#include <paths.h> 96 97/* This is in netdevice.h. However, this compile will fail miserably if 98 you attempt to include netdevice.h because it has so many references 99 to __memcpy functions which it should not attempt to do. So, since I 100 really don't use it, but it must be defined, define it now. */ 101 102#ifndef MAX_ADDR_LEN 103#define xxMAX_ADDR_LEN 7 104#endif 105 106#if __GLIBC__ >= 2 107#include <asm/types.h> /* glibc 2 conflicts with linux/types.h */ 108#include <net/if.h> 109#include <net/if_arp.h> 110#include <net/route.h> 111#include <netinet/if_ether.h> 112#else 113#include <linux/types.h> 114#include <linux/tty.h> 115#include <linux/if.h> 116#include <linux/if_arp.h> 117#include <linux/route.h> 118#include <linux/if_ether.h> 119#endif 120#include <linux/sockios.h> 121#include <netinet/in.h> 122#include <arpa/inet.h> 123 124#include <linux/ppp_defs.h> 125#include <linux/if_ppp.h> 126 127#include "pppd.h" 128#include "fsm.h" 129#include "ipcp.h" 130 131#ifdef IPX_CHANGE 132#include "ipxcp.h" 133#if __GLIBC__ >= 2 && \ 134 !(defined(__powerpc__) && __GLIBC__ == 2 && __GLIBC_MINOR__ == 0) 135#include <netipx/ipx.h> 136#else 137#include <linux/ipx.h> 138#endif 139#endif /* IPX_CHANGE */ 140 141#ifdef PPP_FILTER 142#include <pcap-bpf.h> 143#include <linux/filter.h> 144#endif /* PPP_FILTER */ 145 146#ifdef LOCKLIB 147#include <sys/locks.h> 148#endif 149 150#ifdef INET6 151#ifndef _LINUX_IN6_H 152/* 153 * This is in linux/include/net/ipv6.h. 154 */ 155 156struct in6_ifreq { 157 struct in6_addr ifr6_addr; 158 __u32 ifr6_prefixlen; 159 unsigned int ifr6_ifindex; 160}; 161#endif 162 163#define IN6_LLADDR_FROM_EUI64(sin6, eui64) do { \ 164 memset(&sin6.s6_addr, 0, sizeof(struct in6_addr)); \ 165 sin6.s6_addr16[0] = htons(0xfe80); \ 166 eui64_copy(eui64, sin6.s6_addr32[2]); \ 167 } while (0) 168 169#endif /* INET6 */ 170 171/* We can get an EIO error on an ioctl if the modem has hung up */ 172#define ok_error(num) ((num)==EIO) 173 174static int tty_disc = N_TTY; /* The TTY discipline */ 175static int ppp_disc = N_PPP; /* The PPP discpline */ 176static int initfdflags = -1; /* Initial file descriptor flags for fd */ 177static int ppp_fd = -1; /* fd which is set to PPP discipline */ 178static int sock_fd = -1; /* socket for doing interface ioctls */ 179static int slave_fd = -1; /* pty for old-style demand mode, slave */ 180static int master_fd = -1; /* pty for old-style demand mode, master */ 181#ifdef INET6 182static int sock6_fd = -1; 183#endif /* INET6 */ 184 185/* 186 * For the old-style kernel driver, this is the same as ppp_fd. 187 * For the new-style driver, it is the fd of an instance of /dev/ppp 188 * which is attached to the ppp unit and is used for controlling it. 189 */ 190int ppp_dev_fd = -1; /* fd for /dev/ppp (new style driver) */ 191 192static int chindex; /* channel index (new style driver) */ 193 194static fd_set in_fds; /* set of fds that wait_input waits for */ 195static int max_in_fd; /* highest fd set in in_fds */ 196 197static int has_proxy_arp = 0; 198static int driver_version = 0; 199static int driver_modification = 0; 200static int driver_patch = 0; 201static int driver_is_old = 0; 202static int restore_term = 0; /* 1 => we've munged the terminal */ 203static struct termios inittermios; /* Initial TTY termios */ 204 205int new_style_driver = 0; 206 207static char loop_name[20]; 208static unsigned char inbuf[512]; /* buffer for chars read from loopback */ 209 210static int if_is_up; /* Interface has been marked up */ 211static u_int32_t default_route_gateway; /* Gateway for default route added */ 212static u_int32_t proxy_arp_addr; /* Addr for proxy arp entry added */ 213static char proxy_arp_dev[16]; /* Device for proxy arp entry */ 214static u_int32_t our_old_addr; /* for detecting address changes */ 215static int dynaddr_set; /* 1 if ip_dynaddr set */ 216static int looped; /* 1 if using loop */ 217static int link_mtu; /* mtu for the link (not bundle) */ 218 219static struct utsname utsname; /* for the kernel version */ 220static int kernel_version; 221#define KVERSION(j,n,p) ((j)*1000000 + (n)*1000 + (p)) 222 223#define MAX_IFS 100 224 225#define FLAGS_GOOD (IFF_UP | IFF_BROADCAST) 226#define FLAGS_MASK (IFF_UP | IFF_BROADCAST | \ 227 IFF_POINTOPOINT | IFF_LOOPBACK | IFF_NOARP) 228 229#define SIN_ADDR(x) (((struct sockaddr_in *) (&(x)))->sin_addr.s_addr) 230 231/* Prototypes for procedures local to this file. */ 232static int modify_flags(int fd, int clear_bits, int set_bits); 233static int translate_speed (int bps); 234static int baud_rate_of (int speed); 235static void close_route_table (void); 236static int open_route_table (void); 237static int read_route_table (struct rtentry *rt); 238static int defaultroute_exists (struct rtentry *rt); 239static int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr, 240 char *name, int namelen); 241static void decode_version (char *buf, int *version, int *mod, int *patch); 242static int set_kdebugflag(int level); 243static int ppp_registered(void); 244static int make_ppp_unit(void); 245 246extern u_char inpacket_buf[]; /* borrowed from main.c */ 247 248/* 249 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr, 250 * if it exists. 251 */ 252 253#define SET_SA_FAMILY(addr, family) \ 254 memset ((char *) &(addr), '\0', sizeof(addr)); \ 255 addr.sa_family = (family); 256 257/* 258 * Determine if the PPP connection should still be present. 259 */ 260 261extern int hungup; 262 263/* new_fd is the fd of a tty */ 264static void set_ppp_fd (int new_fd) 265{ 266 ppp_fd = new_fd; 267 if (!new_style_driver) 268 ppp_dev_fd = new_fd; 269} 270 271static int still_ppp(void) 272{ 273 if (new_style_driver) 274 return !hungup && ppp_fd >= 0; 275 if (!hungup || ppp_fd == slave_fd) 276 return 1; 277 if (slave_fd >= 0) { 278 set_ppp_fd(slave_fd); 279 return 1; 280 } 281 return 0; 282} 283 284/* 285 * modify_flags - set and clear flag bits controlling the kernel 286 * PPP driver. 287 */ 288static int modify_flags(int fd, int clear_bits, int set_bits) 289{ 290 int flags; 291 292 if (ioctl(fd, PPPIOCGFLAGS, &flags) == -1) 293 goto err; 294 flags = (flags & ~clear_bits) | set_bits; 295 if (ioctl(fd, PPPIOCSFLAGS, &flags) == -1) 296 goto err; 297 298 return 0; 299 300 err: 301 if (errno != EIO) 302 error("Failed to set PPP kernel option flags: %m"); 303 return -1; 304} 305 306/******************************************************************** 307 * 308 * sys_init - System-dependent initialization. 309 */ 310 311void sys_init(void) 312{ 313 /* Get an internet socket for doing socket ioctls. */ 314 sock_fd = socket(AF_INET, SOCK_DGRAM, 0); 315 if (sock_fd < 0) 316 fatal("Couldn't create IP socket: %m(%d)", errno); 317 318#ifdef INET6 319 sock6_fd = socket(AF_INET6, SOCK_DGRAM, 0); 320 if (sock6_fd < 0) 321 sock6_fd = -errno; /* save errno for later */ 322#endif 323 324 FD_ZERO(&in_fds); 325 max_in_fd = 0; 326} 327 328/******************************************************************** 329 * 330 * sys_cleanup - restore any system state we modified before exiting: 331 * mark the interface down, delete default route and/or proxy arp entry. 332 * This shouldn't call die() because it's called from die(). 333 */ 334 335void sys_cleanup(void) 336{ 337/* 338 * Take down the device 339 */ 340 if (if_is_up) { 341 if_is_up = 0; 342 sifdown(0); 343 } 344/* 345 * Delete any routes through the device. 346 */ 347 if (default_route_gateway != 0) 348 cifdefaultroute(0, 0, default_route_gateway); 349 350 if (has_proxy_arp) 351 cifproxyarp(0, proxy_arp_addr); 352} 353 354/******************************************************************** 355 * 356 * sys_close - Clean up in a child process before execing. 357 */ 358void 359sys_close(void) 360{ 361 if (new_style_driver && ppp_dev_fd >= 0) 362 close(ppp_dev_fd); 363 if (sock_fd >= 0) 364 close(sock_fd); 365#ifdef INET6 366 if (sock6_fd >= 0) 367 close(sock6_fd); 368#endif 369 if (slave_fd >= 0) 370 close(slave_fd); 371 if (master_fd >= 0) 372 close(master_fd); 373} 374 375/******************************************************************** 376 * 377 * set_kdebugflag - Define the debugging level for the kernel 378 */ 379 380static int set_kdebugflag (int requested_level) 381{ 382 if (ppp_dev_fd < 0) 383 return 1; 384 if (ioctl(ppp_dev_fd, PPPIOCSDEBUG, &requested_level) < 0) { 385 if ( ! ok_error (errno) ) 386 error("ioctl(PPPIOCSDEBUG): %m (line %d)", __LINE__); 387 return (0); 388 } 389 return (1); 390} 391 392/******************************************************************** 393 * 394 * tty_establish_ppp - Turn the serial port into a ppp interface. 395 */ 396 397int tty_establish_ppp (int tty_fd) 398{ 399 int ret_fd; 400 401/* 402 * Ensure that the tty device is in exclusive mode. 403 */ 404 if (ioctl(tty_fd, TIOCEXCL, 0) < 0) { 405 if ( ! ok_error ( errno )) 406 warn("Couldn't make tty exclusive: %m"); 407 } 408/* 409 * Demand mode - prime the old ppp device to relinquish the unit. 410 */ 411 if (!new_style_driver && looped 412 && ioctl(slave_fd, PPPIOCXFERUNIT, 0) < 0) { 413 error("ioctl(transfer ppp unit): %m, line %d", __LINE__); 414 return -1; 415 } 416/* 417 * Set the current tty to the PPP discpline 418 */ 419 420#ifndef N_SYNC_PPP 421#define N_SYNC_PPP 14 422#endif 423 ppp_disc = (new_style_driver && sync_serial)? N_SYNC_PPP: N_PPP; 424 if (ioctl(tty_fd, TIOCSETD, &ppp_disc) < 0) { 425 if ( ! ok_error (errno) ) { 426 error("Couldn't set tty to PPP discipline: %m"); 427 return -1; 428 } 429 } 430 431 ret_fd = generic_establish_ppp(tty_fd); 432 433#define SC_RCVB (SC_RCV_B7_0 | SC_RCV_B7_1 | SC_RCV_EVNP | SC_RCV_ODDP) 434#define SC_LOGB (SC_DEBUG | SC_LOG_INPKT | SC_LOG_OUTPKT | SC_LOG_RAWIN \ 435 | SC_LOG_FLUSH) 436 437 if (ret_fd >= 0) { 438 modify_flags(ppp_fd, SC_RCVB | SC_LOGB, 439 (kdebugflag * SC_DEBUG) & SC_LOGB); 440 } else { 441 if (ioctl(tty_fd, TIOCSETD, &tty_disc) < 0 && !ok_error(errno)) 442 warn("Couldn't reset tty to normal line discipline: %m"); 443 } 444 445 return ret_fd; 446} 447 448/******************************************************************** 449 * 450 * generic_establish_ppp - Turn the fd into a ppp interface. 451 */ 452int generic_establish_ppp (int fd) 453{ 454 int x; 455 456 if (new_style_driver) { 457 int flags; 458 459 /* Open an instance of /dev/ppp and connect the channel to it */ 460 if (ioctl(fd, PPPIOCGCHAN, &chindex) == -1) { 461 error("Couldn't get channel number: %m"); 462 goto err; 463 } 464 dbglog("using channel %d", chindex); 465 fd = open("/dev/ppp", O_RDWR); 466 if (fd < 0) { 467 error("Couldn't reopen /dev/ppp: %m"); 468 goto err; 469 } 470 (void) fcntl(fd, F_SETFD, FD_CLOEXEC); 471 if (ioctl(fd, PPPIOCATTCHAN, &chindex) < 0) { 472 error("Couldn't attach to channel %d: %m", chindex); 473 goto err_close; 474 } 475 flags = fcntl(fd, F_GETFL); 476 if (flags == -1 || fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) 477 warn("Couldn't set /dev/ppp (channel) to nonblock: %m"); 478 set_ppp_fd(fd); 479 480 if (!looped) 481 ifunit = -1; 482 if (!looped && !multilink) { 483 /* 484 * Create a new PPP unit. 485 */ 486 if (make_ppp_unit() < 0) 487 goto err_close; 488 } 489 490 if (looped) 491 modify_flags(ppp_dev_fd, SC_LOOP_TRAFFIC, 0); 492 493 if (!multilink) { 494 add_fd(ppp_dev_fd); 495 if (ioctl(fd, PPPIOCCONNECT, &ifunit) < 0) { 496 error("Couldn't attach to PPP unit %d: %m", ifunit); 497 goto err_close; 498 } 499 } 500 501 } else { 502 /* 503 * Old-style driver: find out which interface we were given. 504 */ 505 set_ppp_fd (fd); 506 if (ioctl(fd, PPPIOCGUNIT, &x) < 0) { 507 if (ok_error (errno)) 508 goto err; 509 fatal("ioctl(PPPIOCGUNIT): %m (line %d)", __LINE__); 510 } 511 /* Check that we got the same unit again. */ 512 if (looped && x != ifunit) 513 fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x); 514 ifunit = x; 515 516 /* 517 * Fetch the initial file flags and reset blocking mode on the file. 518 */ 519 initfdflags = fcntl(fd, F_GETFL); 520 if (initfdflags == -1 || 521 fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) { 522 if ( ! ok_error (errno)) 523 warn("Couldn't set device to non-blocking mode: %m"); 524 } 525 } 526 527 /* 528 * Enable debug in the driver if requested. 529 */ 530 if (!looped) 531 set_kdebugflag (kdebugflag); 532 533 looped = 0; 534 535 return ppp_fd; 536 537 err_close: 538 close(fd); 539 err: 540 return -1; 541} 542 543/******************************************************************** 544 * 545 * tty_disestablish_ppp - Restore the serial port to normal operation. 546 * This shouldn't call die() because it's called from die(). 547 */ 548 549void tty_disestablish_ppp(int tty_fd) 550{ 551 if (!hungup) { 552/* 553 * Flush the tty output buffer so that the TIOCSETD doesn't hang. 554 */ 555 if (tcflush(tty_fd, TCIOFLUSH) < 0) 556 { 557 warn("tcflush failed: %m"); 558 goto flushfailed; 559 } 560/* 561 * Restore the previous line discipline 562 */ 563 if (ioctl(tty_fd, TIOCSETD, &tty_disc) < 0) { 564 if ( ! ok_error (errno)) 565 error("ioctl(TIOCSETD, N_TTY): %m (line %d)", __LINE__); 566 } 567 568 if (ioctl(tty_fd, TIOCNXCL, 0) < 0) { 569 if ( ! ok_error (errno)) 570 warn("ioctl(TIOCNXCL): %m (line %d)", __LINE__); 571 } 572 573 /* Reset non-blocking mode on fd. */ 574 if (initfdflags != -1 && fcntl(tty_fd, F_SETFL, initfdflags) < 0) { 575 if ( ! ok_error (errno)) 576 warn("Couldn't restore device fd flags: %m"); 577 } 578 } 579flushfailed: 580 initfdflags = -1; 581 582 generic_disestablish_ppp(tty_fd); 583} 584 585/******************************************************************** 586 * 587 * generic_disestablish_ppp - Restore device components to normal 588 * operation, and reconnect the ppp unit to the loopback if in demand 589 * mode. This shouldn't call die() because it's called from die(). 590 */ 591void generic_disestablish_ppp(int dev_fd) 592{ 593 if (new_style_driver) { 594 close(ppp_fd); 595 ppp_fd = -1; 596 if (demand) { 597 modify_flags(ppp_dev_fd, 0, SC_LOOP_TRAFFIC); 598 looped = 1; 599 } else if (!doing_multilink && ppp_dev_fd >= 0) { 600 close(ppp_dev_fd); 601 remove_fd(ppp_dev_fd); 602 ppp_dev_fd = -1; 603 } 604 } else { 605 /* old-style driver */ 606 if (demand) 607 set_ppp_fd(slave_fd); 608 else 609 ppp_dev_fd = -1; 610 } 611} 612 613/* 614 * make_ppp_unit - make a new ppp unit for ppp_dev_fd. 615 * Assumes new_style_driver. 616 */ 617static int make_ppp_unit() 618{ 619 int x, flags; 620 621 if (ppp_dev_fd >= 0) { 622 dbglog("in make_ppp_unit, already had /dev/ppp open?"); 623 close(ppp_dev_fd); 624 } 625 ppp_dev_fd = open("/dev/ppp", O_RDWR); 626 if (ppp_dev_fd < 0) 627 fatal("Couldn't open /dev/ppp: %m"); 628 flags = fcntl(ppp_dev_fd, F_GETFL); 629 if (flags == -1 630 || fcntl(ppp_dev_fd, F_SETFL, flags | O_NONBLOCK) == -1) 631 warn("Couldn't set /dev/ppp to nonblock: %m"); 632 633 ifunit = req_unit; 634 x = ioctl(ppp_dev_fd, PPPIOCNEWUNIT, &ifunit); 635 if (x < 0 && req_unit >= 0 && errno == EEXIST) { 636 warn("Couldn't allocate PPP unit %d as it is already in use", req_unit); 637 ifunit = -1; 638 x = ioctl(ppp_dev_fd, PPPIOCNEWUNIT, &ifunit); 639 } 640 if (x < 0) 641 error("Couldn't create new ppp unit: %m"); 642 return x; 643} 644 645/* 646 * cfg_bundle - configure the existing bundle. 647 * Used in demand mode. 648 */ 649void cfg_bundle(int mrru, int mtru, int rssn, int tssn) 650{ 651 if (!new_style_driver) 652 return; 653 654 /* set the mrru, mtu and flags */ 655 if (ioctl(ppp_dev_fd, PPPIOCSMRRU, &mrru) < 0) 656 error("Couldn't set MRRU: %m"); 657 658 modify_flags(ppp_dev_fd, SC_MP_SHORTSEQ|SC_MP_XSHORTSEQ|SC_MULTILINK, 659 ((rssn? SC_MP_SHORTSEQ: 0) | (tssn? SC_MP_XSHORTSEQ: 0) 660 | (mrru? SC_MULTILINK: 0))); 661 662 /* connect up the channel */ 663 if (ioctl(ppp_fd, PPPIOCCONNECT, &ifunit) < 0) 664 fatal("Couldn't attach to PPP unit %d: %m", ifunit); 665 add_fd(ppp_dev_fd); 666} 667 668/* 669 * make_new_bundle - create a new PPP unit (i.e. a bundle) 670 * and connect our channel to it. This should only get called 671 * if `multilink' was set at the time establish_ppp was called. 672 * In demand mode this uses our existing bundle instead of making 673 * a new one. 674 */ 675void make_new_bundle(int mrru, int mtru, int rssn, int tssn) 676{ 677 if (!new_style_driver) 678 return; 679 680 /* make us a ppp unit */ 681 if (make_ppp_unit() < 0) 682 die(1); 683 684 /* set the mrru and flags */ 685 cfg_bundle(mrru, mtru, rssn, tssn); 686} 687 688/* 689 * bundle_attach - attach our link to a given PPP unit. 690 * We assume the unit is controlled by another pppd. 691 */ 692int bundle_attach(int ifnum) 693{ 694 int master_fd; 695 696 if (!new_style_driver) 697 return -1; 698 699 master_fd = open("/dev/ppp", O_RDWR); 700 if (master_fd < 0) 701 fatal("Couldn't open /dev/ppp: %m"); 702 if (ioctl(master_fd, PPPIOCATTACH, &ifnum) < 0) { 703 if (errno == ENXIO) { 704 close(master_fd); 705 return 0; /* doesn't still exist */ 706 } 707 fatal("Couldn't attach to interface unit %d: %m\n", ifnum); 708 } 709 if (ioctl(ppp_fd, PPPIOCCONNECT, &ifnum) < 0) 710 fatal("Couldn't connect to interface unit %d: %m", ifnum); 711 modify_flags(master_fd, 0, SC_MULTILINK); 712 close(master_fd); 713 714 ifunit = ifnum; 715 return 1; 716} 717 718/* 719 * destroy_bundle - tell the driver to destroy our bundle. 720 */ 721void destroy_bundle(void) 722{ 723 if (ppp_dev_fd >= 0) { 724 close(ppp_dev_fd); 725 remove_fd(ppp_dev_fd); 726 ppp_dev_fd = -1; 727 } 728} 729 730/******************************************************************** 731 * 732 * clean_check - Fetch the flags for the device and generate 733 * appropriate error messages. 734 */ 735void clean_check(void) 736{ 737 int x; 738 char *s; 739 740 if (still_ppp()) { 741 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) { 742 s = NULL; 743 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) { 744 case SC_RCV_B7_0: 745 s = "all had bit 7 set to 1"; 746 break; 747 748 case SC_RCV_B7_1: 749 s = "all had bit 7 set to 0"; 750 break; 751 752 case SC_RCV_EVNP: 753 s = "all had odd parity"; 754 break; 755 756 case SC_RCV_ODDP: 757 s = "all had even parity"; 758 break; 759 } 760 761 if (s != NULL) { 762 warn("Receive serial link is not 8-bit clean:"); 763 warn("Problem: %s", s); 764 } 765 } 766 } 767} 768 769 770/* 771 * List of valid speeds. 772 */ 773 774struct speed { 775 int speed_int, speed_val; 776} speeds[] = { 777#ifdef B50 778 { 50, B50 }, 779#endif 780#ifdef B75 781 { 75, B75 }, 782#endif 783#ifdef B110 784 { 110, B110 }, 785#endif 786#ifdef B134 787 { 134, B134 }, 788#endif 789#ifdef B150 790 { 150, B150 }, 791#endif 792#ifdef B200 793 { 200, B200 }, 794#endif 795#ifdef B300 796 { 300, B300 }, 797#endif 798#ifdef B600 799 { 600, B600 }, 800#endif 801#ifdef B1200 802 { 1200, B1200 }, 803#endif 804#ifdef B1800 805 { 1800, B1800 }, 806#endif 807#ifdef B2000 808 { 2000, B2000 }, 809#endif 810#ifdef B2400 811 { 2400, B2400 }, 812#endif 813#ifdef B3600 814 { 3600, B3600 }, 815#endif 816#ifdef B4800 817 { 4800, B4800 }, 818#endif 819#ifdef B7200 820 { 7200, B7200 }, 821#endif 822#ifdef B9600 823 { 9600, B9600 }, 824#endif 825#ifdef B19200 826 { 19200, B19200 }, 827#endif 828#ifdef B38400 829 { 38400, B38400 }, 830#endif 831#ifdef B57600 832 { 57600, B57600 }, 833#endif 834#ifdef B76800 835 { 76800, B76800 }, 836#endif 837#ifdef B115200 838 { 115200, B115200 }, 839#endif 840#ifdef EXTA 841 { 19200, EXTA }, 842#endif 843#ifdef EXTB 844 { 38400, EXTB }, 845#endif 846#ifdef B230400 847 { 230400, B230400 }, 848#endif 849#ifdef B460800 850 { 460800, B460800 }, 851#endif 852#ifdef B921600 853 { 921600, B921600 }, 854#endif 855 { 0, 0 } 856}; 857 858/******************************************************************** 859 * 860 * Translate from bits/second to a speed_t. 861 */ 862 863static int translate_speed (int bps) 864{ 865 struct speed *speedp; 866 867 if (bps != 0) { 868 for (speedp = speeds; speedp->speed_int; speedp++) { 869 if (bps == speedp->speed_int) 870 return speedp->speed_val; 871 } 872 warn("speed %d not supported", bps); 873 } 874 return 0; 875} 876 877/******************************************************************** 878 * 879 * Translate from a speed_t to bits/second. 880 */ 881 882static int baud_rate_of (int speed) 883{ 884 struct speed *speedp; 885 886 if (speed != 0) { 887 for (speedp = speeds; speedp->speed_int; speedp++) { 888 if (speed == speedp->speed_val) 889 return speedp->speed_int; 890 } 891 } 892 return 0; 893} 894 895/******************************************************************** 896 * 897 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity, 898 * at the requested speed, etc. If `local' is true, set CLOCAL 899 * regardless of whether the modem option was specified. 900 */ 901 902void set_up_tty(int tty_fd, int local) 903{ 904 int speed; 905 struct termios tios; 906 907 setdtr(tty_fd, 1); 908 if (tcgetattr(tty_fd, &tios) < 0) { 909 if (!ok_error(errno)) 910 fatal("tcgetattr: %m (line %d)", __LINE__); 911 return; 912 } 913 914 if (!restore_term) 915 inittermios = tios; 916 917 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL); 918 tios.c_cflag |= CS8 | CREAD | HUPCL; 919 920 tios.c_iflag = IGNBRK | IGNPAR; 921 tios.c_oflag = 0; 922 tios.c_lflag = 0; 923 tios.c_cc[VMIN] = 1; 924 tios.c_cc[VTIME] = 0; 925 926 if (local || !modem) 927 tios.c_cflag ^= (CLOCAL | HUPCL); 928 929 switch (crtscts) { 930 case 1: 931 tios.c_cflag |= CRTSCTS; 932 break; 933 934 case -2: 935 tios.c_iflag |= IXON | IXOFF; 936 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */ 937 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */ 938 break; 939 940 case -1: 941 tios.c_cflag &= ~CRTSCTS; 942 break; 943 944 default: 945 break; 946 } 947 948 speed = translate_speed(inspeed); 949 if (speed) { 950 cfsetospeed (&tios, speed); 951 cfsetispeed (&tios, speed); 952 } 953/* 954 * We can't proceed if the serial port speed is B0, 955 * since that implies that the serial port is disabled. 956 */ 957 else { 958 speed = cfgetospeed(&tios); 959 if (speed == B0) 960 fatal("Baud rate for %s is 0; need explicit baud rate", devnam); 961 } 962 963 while (tcsetattr(tty_fd, TCSAFLUSH, &tios) < 0 && !ok_error(errno)) 964 if (errno != EINTR) 965 fatal("tcsetattr: %m (line %d)", __LINE__); 966 967 baud_rate = baud_rate_of(speed); 968 restore_term = 1; 969} 970 971/******************************************************************** 972 * 973 * setdtr - control the DTR line on the serial port. 974 * This is called from die(), so it shouldn't call die(). 975 */ 976 977void setdtr (int tty_fd, int on) 978{ 979 int modembits = TIOCM_DTR; 980 981 ioctl(tty_fd, (on ? TIOCMBIS : TIOCMBIC), &modembits); 982} 983 984/******************************************************************** 985 * 986 * restore_tty - restore the terminal to the saved settings. 987 */ 988 989void restore_tty (int tty_fd) 990{ 991 if (restore_term) { 992 restore_term = 0; 993/* 994 * Turn off echoing, because otherwise we can get into 995 * a loop with the tty and the modem echoing to each other. 996 * We presume we are the sole user of this tty device, so 997 * when we close it, it will revert to its defaults anyway. 998 */ 999 if (!default_device) 1000 inittermios.c_lflag &= ~(ECHO | ECHONL); 1001 1002 if (tcsetattr(tty_fd, TCSAFLUSH, &inittermios) < 0) { 1003 if (! ok_error (errno)) 1004 warn("tcsetattr: %m (line %d)", __LINE__); 1005 } 1006 } 1007} 1008 1009/******************************************************************** 1010 * 1011 * output - Output PPP packet. 1012 */ 1013 1014void output (int unit, unsigned char *p, int len) 1015{ 1016 int fd = ppp_fd; 1017 int proto; 1018 1019 dump_packet("sent", p, len); 1020 if (snoop_send_hook) snoop_send_hook(p, len); 1021 1022 if (len < PPP_HDRLEN) 1023 return; 1024 if (new_style_driver) { 1025 p += 2; 1026 len -= 2; 1027 proto = (p[0] << 8) + p[1]; 1028 if (ppp_dev_fd >= 0 && !(proto >= 0xc000 || proto == PPP_CCPFRAG)) 1029 fd = ppp_dev_fd; 1030 } 1031 if (write(fd, p, len) < 0) { 1032 if (errno == EWOULDBLOCK || errno == EAGAIN || errno == ENOBUFS 1033 || errno == ENXIO || errno == EIO || errno == EINTR) 1034 warn("write: warning: %m (%d)", errno); 1035 else 1036 error("write: %m (%d)", errno); 1037 } 1038} 1039 1040/******************************************************************** 1041 * 1042 * wait_input - wait until there is data available, 1043 * for the length of time specified by *timo (indefinite 1044 * if timo is NULL). 1045 */ 1046 1047void wait_input(struct timeval *timo) 1048{ 1049 fd_set ready, exc; 1050 int n; 1051 1052 ready = in_fds; 1053 exc = in_fds; 1054 n = select(max_in_fd + 1, &ready, NULL, &exc, timo); 1055 if (n < 0 && errno != EINTR) 1056 fatal("select: %m"); 1057} 1058 1059/* 1060 * add_fd - add an fd to the set that wait_input waits for. 1061 */ 1062void add_fd(int fd) 1063{ 1064 if (fd >= FD_SETSIZE) 1065 fatal("internal error: file descriptor too large (%d)", fd); 1066 FD_SET(fd, &in_fds); 1067 if (fd > max_in_fd) 1068 max_in_fd = fd; 1069} 1070 1071/* 1072 * remove_fd - remove an fd from the set that wait_input waits for. 1073 */ 1074void remove_fd(int fd) 1075{ 1076 FD_CLR(fd, &in_fds); 1077} 1078 1079 1080/******************************************************************** 1081 * 1082 * read_packet - get a PPP packet from the serial device. 1083 */ 1084 1085int read_packet (unsigned char *buf) 1086{ 1087 int len, nr; 1088 1089 len = PPP_MRU + PPP_HDRLEN; 1090 if (new_style_driver) { 1091 *buf++ = PPP_ALLSTATIONS; 1092 *buf++ = PPP_UI; 1093 len -= 2; 1094 } 1095 nr = -1; 1096 1097 if (ppp_fd >= 0) { 1098 nr = read(ppp_fd, buf, len); 1099 if (nr < 0 && errno != EWOULDBLOCK && errno != EAGAIN 1100 && errno != EIO && errno != EINTR) 1101 error("read: %m"); 1102 if (nr < 0 && errno == ENXIO) 1103 return 0; 1104 } 1105 if (nr < 0 && new_style_driver && ppp_dev_fd >= 0 && !bundle_eof) { 1106 /* N.B. we read ppp_fd first since LCP packets come in there. */ 1107 nr = read(ppp_dev_fd, buf, len); 1108 if (nr < 0 && errno != EWOULDBLOCK && errno != EAGAIN 1109 && errno != EIO && errno != EINTR) 1110 error("read /dev/ppp: %m"); 1111 if (nr < 0 && errno == ENXIO) 1112 nr = 0; 1113 if (nr == 0 && doing_multilink) { 1114 remove_fd(ppp_dev_fd); 1115 bundle_eof = 1; 1116 } 1117 } 1118 if (new_style_driver && ppp_fd < 0 && ppp_dev_fd < 0) 1119 nr = 0; 1120 return (new_style_driver && nr > 0)? nr+2: nr; 1121} 1122 1123/******************************************************************** 1124 * 1125 * get_loop_output - get outgoing packets from the ppp device, 1126 * and detect when we want to bring the real link up. 1127 * Return value is 1 if we need to bring up the link, 0 otherwise. 1128 */ 1129int 1130get_loop_output(void) 1131{ 1132 int rv = 0; 1133 int n; 1134 1135 if (new_style_driver) { 1136 while ((n = read_packet(inpacket_buf)) > 0) 1137 if (loop_frame(inpacket_buf, n)) 1138 rv = 1; 1139 return rv; 1140 } 1141 1142 while ((n = read(master_fd, inbuf, sizeof(inbuf))) > 0) 1143 if (loop_chars(inbuf, n)) 1144 rv = 1; 1145 1146 if (n == 0) 1147 fatal("eof on loopback"); 1148 1149 if (errno != EWOULDBLOCK && errno != EAGAIN) 1150 fatal("read from loopback: %m(%d)", errno); 1151 1152 return rv; 1153} 1154 1155/* 1156 * netif_set_mtu - set the MTU on the PPP network interface. 1157 */ 1158void 1159netif_set_mtu(int unit, int mtu) 1160{ 1161 struct ifreq ifr; 1162 1163 memset (&ifr, '\0', sizeof (ifr)); 1164 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); 1165 ifr.ifr_mtu = mtu; 1166 1167 if (ifunit >= 0 && ioctl(sock_fd, SIOCSIFMTU, (caddr_t) &ifr) < 0) 1168 error("ioctl(SIOCSIFMTU): %m (line %d)", __LINE__); 1169} 1170 1171/* 1172 * netif_get_mtu - get the MTU on the PPP network interface. 1173 */ 1174int 1175netif_get_mtu(int unit) 1176{ 1177 struct ifreq ifr; 1178 1179 memset (&ifr, '\0', sizeof (ifr)); 1180 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); 1181 1182 if (ifunit >= 0 && ioctl(sock_fd, SIOCGIFMTU, (caddr_t) &ifr) < 0) { 1183 error("ioctl(SIOCGIFMTU): %m (line %d)", __LINE__); 1184 return 0; 1185 } 1186 return ifr.ifr_mtu; 1187} 1188 1189/******************************************************************** 1190 * 1191 * tty_send_config - configure the transmit characteristics of 1192 * the ppp interface. 1193 */ 1194 1195void tty_send_config(int mtu, u_int32_t asyncmap, int pcomp, int accomp) 1196{ 1197 int x; 1198 1199 if (!still_ppp()) 1200 return; 1201 link_mtu = mtu; 1202 if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) { 1203 if (errno != EIO && errno != ENOTTY) 1204 error("Couldn't set transmit async character map: %m"); 1205 ++error_count; 1206 return; 1207 } 1208 1209 x = (pcomp? SC_COMP_PROT: 0) | (accomp? SC_COMP_AC: 0) 1210 | (sync_serial? SC_SYNC: 0); 1211 modify_flags(ppp_fd, SC_COMP_PROT|SC_COMP_AC|SC_SYNC, x); 1212} 1213 1214/******************************************************************** 1215 * 1216 * tty_set_xaccm - set the extended transmit ACCM for the interface. 1217 */ 1218 1219void tty_set_xaccm (ext_accm accm) 1220{ 1221 if (!still_ppp()) 1222 return; 1223 if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY) { 1224 if ( ! ok_error (errno)) 1225 warn("ioctl(set extended ACCM): %m (line %d)", __LINE__); 1226 } 1227} 1228 1229/******************************************************************** 1230 * 1231 * tty_recv_config - configure the receive-side characteristics of 1232 * the ppp interface. 1233 */ 1234 1235void tty_recv_config(int mru, u_int32_t asyncmap, int pcomp, int accomp) 1236{ 1237/* 1238 * If we were called because the link has gone down then there is nothing 1239 * which may be done. Just return without incident. 1240 */ 1241 if (!still_ppp()) 1242 return; 1243/* 1244 * Set the receiver parameters 1245 */ 1246 if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0) { 1247 if (errno != EIO && errno != ENOTTY) 1248 error("Couldn't set channel receive MRU: %m"); 1249 } 1250 if (new_style_driver && ppp_dev_fd >= 0 1251 && ioctl(ppp_dev_fd, PPPIOCSMRU, (caddr_t) &mru) < 0) 1252 error("Couldn't set MRU in generic PPP layer: %m"); 1253 1254 if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) { 1255 if (errno != EIO && errno != ENOTTY) 1256 error("Couldn't set channel receive asyncmap: %m"); 1257 } 1258} 1259 1260/******************************************************************** 1261 * 1262 * ccp_test - ask kernel whether a given compression method 1263 * is acceptable for use. 1264 */ 1265 1266int 1267ccp_test(int unit, u_char *opt_ptr, int opt_len, int for_transmit) 1268{ 1269 struct ppp_option_data data; 1270 1271 memset (&data, '\0', sizeof (data)); 1272 data.ptr = opt_ptr; 1273 data.length = opt_len; 1274 data.transmit = for_transmit; 1275 1276 if (ioctl(ppp_dev_fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0) 1277 return 1; 1278 1279 return (errno == ENOBUFS)? 0: -1; 1280} 1281 1282/******************************************************************** 1283 * 1284 * ccp_flags_set - inform kernel about the current state of CCP. 1285 */ 1286 1287void ccp_flags_set (int unit, int isopen, int isup) 1288{ 1289 int x; 1290 1291 x = (isopen? SC_CCP_OPEN: 0) | (isup? SC_CCP_UP: 0); 1292 if (still_ppp() && ppp_dev_fd >= 0) 1293 modify_flags(ppp_dev_fd, SC_CCP_OPEN|SC_CCP_UP, x); 1294} 1295 1296#ifdef PPP_FILTER 1297/* 1298 * set_filters - set the active and pass filters in the kernel driver. 1299 */ 1300int set_filters(struct bpf_program *pass, struct bpf_program *active) 1301{ 1302 struct sock_fprog fp; 1303 1304 fp.len = pass->bf_len; 1305 fp.filter = (struct sock_filter *) pass->bf_insns; 1306 if (ioctl(ppp_dev_fd, PPPIOCSPASS, &fp) < 0) { 1307 if (errno == ENOTTY) 1308 warn("kernel does not support PPP filtering"); 1309 else 1310 error("Couldn't set pass-filter in kernel: %m"); 1311 return 0; 1312 } 1313 fp.len = active->bf_len; 1314 fp.filter = (struct sock_filter *) active->bf_insns; 1315 if (ioctl(ppp_dev_fd, PPPIOCSACTIVE, &fp) < 0) { 1316 error("Couldn't set active-filter in kernel: %m"); 1317 return 0; 1318 } 1319 return 1; 1320} 1321#endif /* PPP_FILTER */ 1322 1323/******************************************************************** 1324 * 1325 * get_idle_time - return how long the link has been idle. 1326 */ 1327int 1328get_idle_time(u, ip) 1329 int u; 1330 struct ppp_idle *ip; 1331{ 1332 return ioctl(ppp_dev_fd, PPPIOCGIDLE, ip) >= 0; 1333} 1334 1335/******************************************************************** 1336 * 1337 * get_ppp_stats - return statistics for the link. 1338 */ 1339int 1340get_ppp_stats(u, stats) 1341 int u; 1342 struct pppd_stats *stats; 1343{ 1344 struct ifpppstatsreq req; 1345 1346 memset (&req, 0, sizeof (req)); 1347 1348 req.stats_ptr = (caddr_t) &req.stats; 1349 strlcpy(req.ifr__name, ifname, sizeof(req.ifr__name)); 1350 if (ioctl(sock_fd, SIOCGPPPSTATS, &req) < 0) { 1351 error("Couldn't get PPP statistics: %m"); 1352 return 0; 1353 } 1354 stats->bytes_in = req.stats.p.ppp_ibytes; 1355 stats->bytes_out = req.stats.p.ppp_obytes; 1356 stats->pkts_in = req.stats.p.ppp_ipackets; 1357 stats->pkts_out = req.stats.p.ppp_opackets; 1358 return 1; 1359} 1360 1361/******************************************************************** 1362 * 1363 * ccp_fatal_error - returns 1 if decompression was disabled as a 1364 * result of an error detected after decompression of a packet, 1365 * 0 otherwise. This is necessary because of patent nonsense. 1366 */ 1367 1368int ccp_fatal_error (int unit) 1369{ 1370 int flags; 1371 1372 if (ioctl(ppp_dev_fd, PPPIOCGFLAGS, &flags) < 0) { 1373 error("Couldn't read compression error flags: %m"); 1374 flags = 0; 1375 } 1376 return flags & SC_DC_FERROR; 1377} 1378 1379/******************************************************************** 1380 * 1381 * path_to_procfs - find the path to the proc file system mount point 1382 */ 1383static char proc_path[MAXPATHLEN]; 1384static int proc_path_len; 1385 1386static char *path_to_procfs(const char *tail) 1387{ 1388 struct mntent *mntent; 1389 FILE *fp; 1390 1391 if (proc_path_len == 0) { 1392 /* Default the mount location of /proc */ 1393 strlcpy (proc_path, "/proc", sizeof(proc_path)); 1394 proc_path_len = 5; 1395 fp = fopen(_PATH_MOUNTED, "r"); 1396 if (fp != NULL) { 1397 while ((mntent = getmntent(fp)) != NULL) { 1398 if (strcmp(mntent->mnt_type, MNTTYPE_IGNORE) == 0) 1399 continue; 1400 if (strcmp(mntent->mnt_type, "proc") == 0) { 1401 strlcpy(proc_path, mntent->mnt_dir, sizeof(proc_path)); 1402 proc_path_len = strlen(proc_path); 1403 break; 1404 } 1405 } 1406 fclose (fp); 1407 } 1408 } 1409 1410 strlcpy(proc_path + proc_path_len, tail, 1411 sizeof(proc_path) - proc_path_len); 1412 return proc_path; 1413} 1414 1415/* 1416 * /proc/net/route parsing stuff. 1417 */ 1418#define ROUTE_MAX_COLS 12 1419FILE *route_fd = (FILE *) 0; 1420static char route_buffer[512]; 1421static int route_dev_col, route_dest_col, route_gw_col; 1422static int route_flags_col, route_mask_col; 1423static int route_num_cols; 1424 1425static int open_route_table (void); 1426static void close_route_table (void); 1427static int read_route_table (struct rtentry *rt); 1428 1429/******************************************************************** 1430 * 1431 * close_route_table - close the interface to the route table 1432 */ 1433 1434static void close_route_table (void) 1435{ 1436 if (route_fd != (FILE *) 0) { 1437 fclose (route_fd); 1438 route_fd = (FILE *) 0; 1439 } 1440} 1441 1442/******************************************************************** 1443 * 1444 * open_route_table - open the interface to the route table 1445 */ 1446static char route_delims[] = " \t\n"; 1447 1448static int open_route_table (void) 1449{ 1450 char *path; 1451 1452 close_route_table(); 1453 1454 path = path_to_procfs("/net/route"); 1455 route_fd = fopen (path, "r"); 1456 if (route_fd == NULL) { 1457 error("can't open routing table %s: %m", path); 1458 return 0; 1459 } 1460 1461 route_dev_col = 0; /* default to usual columns */ 1462 route_dest_col = 1; 1463 route_gw_col = 2; 1464 route_flags_col = 3; 1465 route_mask_col = 7; 1466 route_num_cols = 8; 1467 1468 /* parse header line */ 1469 if (fgets(route_buffer, sizeof(route_buffer), route_fd) != 0) { 1470 char *p = route_buffer, *q; 1471 int col; 1472 for (col = 0; col < ROUTE_MAX_COLS; ++col) { 1473 int used = 1; 1474 if ((q = strtok(p, route_delims)) == 0) 1475 break; 1476 if (strcasecmp(q, "iface") == 0) 1477 route_dev_col = col; 1478 else if (strcasecmp(q, "destination") == 0) 1479 route_dest_col = col; 1480 else if (strcasecmp(q, "gateway") == 0) 1481 route_gw_col = col; 1482 else if (strcasecmp(q, "flags") == 0) 1483 route_flags_col = col; 1484 else if (strcasecmp(q, "mask") == 0) 1485 route_mask_col = col; 1486 else 1487 used = 0; 1488 if (used && col >= route_num_cols) 1489 route_num_cols = col + 1; 1490 p = NULL; 1491 } 1492 } 1493 1494 return 1; 1495} 1496 1497/******************************************************************** 1498 * 1499 * read_route_table - read the next entry from the route table 1500 */ 1501 1502static int read_route_table(struct rtentry *rt) 1503{ 1504 char *cols[ROUTE_MAX_COLS], *p; 1505 int col; 1506 1507 memset (rt, '\0', sizeof (struct rtentry)); 1508 1509 if (fgets (route_buffer, sizeof (route_buffer), route_fd) == (char *) 0) 1510 return 0; 1511 1512 p = route_buffer; 1513 for (col = 0; col < route_num_cols; ++col) { 1514 cols[col] = strtok(p, route_delims); 1515 if (cols[col] == NULL) 1516 return 0; /* didn't get enough columns */ 1517 p = NULL; 1518 } 1519 1520 SIN_ADDR(rt->rt_dst) = strtoul(cols[route_dest_col], NULL, 16); 1521 SIN_ADDR(rt->rt_gateway) = strtoul(cols[route_gw_col], NULL, 16); 1522 SIN_ADDR(rt->rt_genmask) = strtoul(cols[route_mask_col], NULL, 16); 1523 1524 rt->rt_flags = (short) strtoul(cols[route_flags_col], NULL, 16); 1525 rt->rt_dev = cols[route_dev_col]; 1526 1527 return 1; 1528} 1529 1530/******************************************************************** 1531 * 1532 * defaultroute_exists - determine if there is a default route 1533 */ 1534 1535static int defaultroute_exists (struct rtentry *rt) 1536{ 1537 int result = 0; 1538 1539 if (!open_route_table()) 1540 return 0; 1541 1542 while (read_route_table(rt) != 0) { 1543 if ((rt->rt_flags & RTF_UP) == 0) 1544 continue; 1545 1546 if (kernel_version > KVERSION(2,1,0) && SIN_ADDR(rt->rt_genmask) != 0) 1547 continue; 1548 if (SIN_ADDR(rt->rt_dst) == 0L) { 1549 result = 1; 1550 break; 1551 } 1552 } 1553 1554 close_route_table(); 1555 return result; 1556} 1557 1558/* 1559 * have_route_to - determine if the system has any route to 1560 * a given IP address. `addr' is in network byte order. 1561 * Return value is 1 if yes, 0 if no, -1 if don't know. 1562 * For demand mode to work properly, we have to ignore routes 1563 * through our own interface. 1564 */ 1565int have_route_to(u_int32_t addr) 1566{ 1567 struct rtentry rt; 1568 int result = 0; 1569 1570 if (!open_route_table()) 1571 return -1; /* don't know */ 1572 1573 while (read_route_table(&rt)) { 1574 if ((rt.rt_flags & RTF_UP) == 0 || strcmp(rt.rt_dev, ifname) == 0) 1575 continue; 1576 if ((addr & SIN_ADDR(rt.rt_genmask)) == SIN_ADDR(rt.rt_dst)) { 1577 result = 1; 1578 break; 1579 } 1580 } 1581 1582 close_route_table(); 1583 return result; 1584} 1585 1586/******************************************************************** 1587 * 1588 * sifdefaultroute - assign a default route through the address given. 1589 */ 1590 1591int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway) 1592{ 1593 struct rtentry rt; 1594 1595 if (defaultroute_exists(&rt) && strcmp(rt.rt_dev, ifname) != 0) { 1596 u_int32_t old_gateway = SIN_ADDR(rt.rt_gateway); 1597 1598 if (old_gateway != gateway) 1599 error("not replacing existing default route to %s [%I]", 1600 rt.rt_dev, old_gateway); 1601 return 0; 1602 } 1603 1604 memset (&rt, '\0', sizeof (rt)); 1605 SET_SA_FAMILY (rt.rt_dst, AF_INET); 1606 SET_SA_FAMILY (rt.rt_gateway, AF_INET); 1607 1608 rt.rt_dev = ifname; 1609 1610 if (kernel_version > KVERSION(2,1,0)) { 1611 SET_SA_FAMILY (rt.rt_genmask, AF_INET); 1612 SIN_ADDR(rt.rt_genmask) = 0L; 1613 } 1614 1615 SIN_ADDR(rt.rt_gateway) = gateway; 1616 1617 rt.rt_flags = RTF_UP | RTF_GATEWAY; 1618 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) { 1619 if ( ! ok_error ( errno )) 1620 error("default route ioctl(SIOCADDRT): %m"); 1621 return 0; 1622 } 1623 1624 default_route_gateway = gateway; 1625 return 1; 1626} 1627 1628/******************************************************************** 1629 * 1630 * cifdefaultroute - delete a default route through the address given. 1631 */ 1632 1633int cifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway) 1634{ 1635 struct rtentry rt; 1636 1637 default_route_gateway = 0; 1638 1639 memset (&rt, '\0', sizeof (rt)); 1640 SET_SA_FAMILY (rt.rt_dst, AF_INET); 1641 SET_SA_FAMILY (rt.rt_gateway, AF_INET); 1642 1643 if (kernel_version > KVERSION(2,1,0)) { 1644 SET_SA_FAMILY (rt.rt_genmask, AF_INET); 1645 SIN_ADDR(rt.rt_genmask) = 0L; 1646 } 1647 1648 SIN_ADDR(rt.rt_gateway) = gateway; 1649 1650 rt.rt_flags = RTF_UP | RTF_GATEWAY; 1651 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) { 1652 if (still_ppp()) { 1653 if ( ! ok_error ( errno )) 1654 error("default route ioctl(SIOCDELRT): %m"); 1655 return 0; 1656 } 1657 } 1658 1659 return 1; 1660} 1661 1662/******************************************************************** 1663 * 1664 * sifproxyarp - Make a proxy ARP entry for the peer. 1665 */ 1666 1667int sifproxyarp (int unit, u_int32_t his_adr) 1668{ 1669 struct arpreq arpreq; 1670 char *forw_path; 1671 1672 if (has_proxy_arp == 0) { 1673 memset (&arpreq, '\0', sizeof(arpreq)); 1674 1675 SET_SA_FAMILY(arpreq.arp_pa, AF_INET); 1676 SIN_ADDR(arpreq.arp_pa) = his_adr; 1677 arpreq.arp_flags = ATF_PERM | ATF_PUBL; 1678/* 1679 * Get the hardware address of an interface on the same subnet 1680 * as our local address. 1681 */ 1682 if (!get_ether_addr(his_adr, &arpreq.arp_ha, proxy_arp_dev, 1683 sizeof(proxy_arp_dev))) { 1684 error("Cannot determine ethernet address for proxy ARP"); 1685 return 0; 1686 } 1687 strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev)); 1688 1689 if (ioctl(sock_fd, SIOCSARP, (caddr_t)&arpreq) < 0) { 1690 if ( ! ok_error ( errno )) 1691 error("ioctl(SIOCSARP): %m"); 1692 return 0; 1693 } 1694 proxy_arp_addr = his_adr; 1695 has_proxy_arp = 1; 1696 1697 if (tune_kernel) { 1698 forw_path = path_to_procfs("/sys/net/ipv4/ip_forward"); 1699 if (forw_path != 0) { 1700 int fd = open(forw_path, O_WRONLY); 1701 if (fd >= 0) { 1702 if (write(fd, "1", 1) != 1) 1703 error("Couldn't enable IP forwarding: %m"); 1704 close(fd); 1705 } 1706 } 1707 } 1708 } 1709 1710 return 1; 1711} 1712 1713/******************************************************************** 1714 * 1715 * cifproxyarp - Delete the proxy ARP entry for the peer. 1716 */ 1717 1718int cifproxyarp (int unit, u_int32_t his_adr) 1719{ 1720 struct arpreq arpreq; 1721 1722 if (has_proxy_arp) { 1723 has_proxy_arp = 0; 1724 memset (&arpreq, '\0', sizeof(arpreq)); 1725 SET_SA_FAMILY(arpreq.arp_pa, AF_INET); 1726 SIN_ADDR(arpreq.arp_pa) = his_adr; 1727 arpreq.arp_flags = ATF_PERM | ATF_PUBL; 1728 strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev)); 1729 1730 if (ioctl(sock_fd, SIOCDARP, (caddr_t)&arpreq) < 0) { 1731 if ( ! ok_error ( errno )) 1732 warn("ioctl(SIOCDARP): %m"); 1733 return 0; 1734 } 1735 } 1736 return 1; 1737} 1738 1739/******************************************************************** 1740 * 1741 * get_ether_addr - get the hardware address of an interface on the 1742 * the same subnet as ipaddr. 1743 */ 1744 1745static int get_ether_addr (u_int32_t ipaddr, 1746 struct sockaddr *hwaddr, 1747 char *name, int namelen) 1748{ 1749 struct ifreq *ifr, *ifend; 1750 u_int32_t ina, mask; 1751 char *aliasp; 1752 struct ifreq ifreq, bestifreq; 1753 struct ifconf ifc; 1754 struct ifreq ifs[MAX_IFS]; 1755 1756 u_int32_t bestmask=0; 1757 int found_interface = 0; 1758 1759 ifc.ifc_len = sizeof(ifs); 1760 ifc.ifc_req = ifs; 1761 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) { 1762 if ( ! ok_error ( errno )) 1763 error("ioctl(SIOCGIFCONF): %m (line %d)", __LINE__); 1764 return 0; 1765 } 1766 1767/* 1768 * Scan through looking for an interface with an Internet 1769 * address on the same subnet as `ipaddr'. 1770 */ 1771 ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq)); 1772 for (ifr = ifc.ifc_req; ifr < ifend; ifr++) { 1773 if (ifr->ifr_addr.sa_family == AF_INET) { 1774 ina = SIN_ADDR(ifr->ifr_addr); 1775 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name)); 1776/* 1777 * Check that the interface is up, and not point-to-point 1778 * nor loopback. 1779 */ 1780 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0) 1781 continue; 1782 1783 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0) 1784 continue; 1785/* 1786 * Get its netmask and check that it's on the right subnet. 1787 */ 1788 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0) 1789 continue; 1790 1791 mask = SIN_ADDR(ifreq.ifr_addr); 1792 1793 if (((ipaddr ^ ina) & mask) != 0) 1794 continue; /* no match */ 1795 /* matched */ 1796 if (mask >= bestmask) { 1797 /* Compare using >= instead of > -- it is possible for 1798 an interface to have a netmask of 0.0.0.0 */ 1799 found_interface = 1; 1800 bestifreq = ifreq; 1801 bestmask = mask; 1802 } 1803 } 1804 } 1805 1806 if (!found_interface) return 0; 1807 1808 strlcpy(name, bestifreq.ifr_name, namelen); 1809 1810 /* trim off the :1 in eth0:1 */ 1811 aliasp = strchr(name, ':'); 1812 if (aliasp != 0) 1813 *aliasp = 0; 1814 1815 info("found interface %s for proxy arp", name); 1816/* 1817 * Now get the hardware address. 1818 */ 1819 memset (&bestifreq.ifr_hwaddr, 0, sizeof (struct sockaddr)); 1820 if (ioctl (sock_fd, SIOCGIFHWADDR, &bestifreq) < 0) { 1821 error("SIOCGIFHWADDR(%s): %m", bestifreq.ifr_name); 1822 return 0; 1823 } 1824 1825 memcpy (hwaddr, 1826 &bestifreq.ifr_hwaddr, 1827 sizeof (struct sockaddr)); 1828 1829 return 1; 1830} 1831 1832/* 1833 * get_if_hwaddr - get the hardware address for the specified 1834 * network interface device. 1835 */ 1836int 1837get_if_hwaddr(u_char *addr, char *name) 1838{ 1839 struct ifreq ifreq; 1840 int ret, sock_fd; 1841 1842 sock_fd = socket(AF_INET, SOCK_DGRAM, 0); 1843 if (sock_fd < 0) 1844 return 0; 1845 memset(&ifreq.ifr_hwaddr, 0, sizeof(struct sockaddr)); 1846 strlcpy(ifreq.ifr_name, name, sizeof(ifreq.ifr_name)); 1847 ret = ioctl(sock_fd, SIOCGIFHWADDR, &ifreq); 1848 close(sock_fd); 1849 if (ret >= 0) 1850 memcpy(addr, ifreq.ifr_hwaddr.sa_data, 6); 1851 return ret; 1852} 1853 1854/* 1855 * get_first_ethernet - return the name of the first ethernet-style 1856 * interface on this system. 1857 */ 1858char * 1859get_first_ethernet() 1860{ 1861 return "eth0"; 1862} 1863 1864/******************************************************************** 1865 * 1866 * Return user specified netmask, modified by any mask we might determine 1867 * for address `addr' (in network byte order). 1868 * Here we scan through the system's list of interfaces, looking for 1869 * any non-point-to-point interfaces which might appear to be on the same 1870 * network as `addr'. If we find any, we OR in their netmask to the 1871 * user-specified netmask. 1872 */ 1873 1874u_int32_t GetMask (u_int32_t addr) 1875{ 1876 u_int32_t mask, nmask, ina; 1877 struct ifreq *ifr, *ifend, ifreq; 1878 struct ifconf ifc; 1879 struct ifreq ifs[MAX_IFS]; 1880 1881 addr = ntohl(addr); 1882 1883 if (IN_CLASSA(addr)) /* determine network mask for address class */ 1884 nmask = IN_CLASSA_NET; 1885 else if (IN_CLASSB(addr)) 1886 nmask = IN_CLASSB_NET; 1887 else 1888 nmask = IN_CLASSC_NET; 1889 1890 /* class D nets are disallowed by bad_ip_adrs */ 1891 mask = netmask | htonl(nmask); 1892/* 1893 * Scan through the system's network interfaces. 1894 */ 1895 ifc.ifc_len = sizeof(ifs); 1896 ifc.ifc_req = ifs; 1897 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) { 1898 if ( ! ok_error ( errno )) 1899 warn("ioctl(SIOCGIFCONF): %m (line %d)", __LINE__); 1900 return mask; 1901 } 1902 1903 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len); 1904 for (ifr = ifc.ifc_req; ifr < ifend; ifr++) { 1905/* 1906 * Check the interface's internet address. 1907 */ 1908 if (ifr->ifr_addr.sa_family != AF_INET) 1909 continue; 1910 ina = SIN_ADDR(ifr->ifr_addr); 1911 if (((ntohl(ina) ^ addr) & nmask) != 0) 1912 continue; 1913/* 1914 * Check that the interface is up, and not point-to-point nor loopback. 1915 */ 1916 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name)); 1917 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0) 1918 continue; 1919 1920 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0) 1921 continue; 1922/* 1923 * Get its netmask and OR it into our mask. 1924 */ 1925 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0) 1926 continue; 1927 mask |= SIN_ADDR(ifreq.ifr_addr); 1928 break; 1929 } 1930 return mask; 1931} 1932 1933/******************************************************************** 1934 * 1935 * Internal routine to decode the version.modification.patch level 1936 */ 1937 1938static void decode_version (char *buf, int *version, 1939 int *modification, int *patch) 1940{ 1941 char *endp; 1942 1943 *version = (int) strtoul (buf, &endp, 10); 1944 *modification = 0; 1945 *patch = 0; 1946 1947 if (endp != buf && *endp == '.') { 1948 buf = endp + 1; 1949 *modification = (int) strtoul (buf, &endp, 10); 1950 if (endp != buf && *endp == '.') { 1951 buf = endp + 1; 1952 *patch = (int) strtoul (buf, &buf, 10); 1953 } 1954 } 1955} 1956 1957/******************************************************************** 1958 * 1959 * Procedure to determine if the PPP line discipline is registered. 1960 */ 1961 1962static int 1963ppp_registered(void) 1964{ 1965 int local_fd; 1966 int mfd = -1; 1967 int ret = 0; 1968 char slave[16]; 1969 1970 /* 1971 * We used to open the serial device and set it to the ppp line 1972 * discipline here, in order to create a ppp unit. But that is 1973 * not a good idea - the user might have specified a device that 1974 * they can't open (permission, or maybe it doesn't really exist). 1975 * So we grab a pty master/slave pair and use that. 1976 */ 1977 if (!get_pty(&mfd, &local_fd, slave, 0)) { 1978 no_ppp_msg = "Couldn't determine if PPP is supported (no free ptys)"; 1979 return 0; 1980 } 1981 1982 /* 1983 * Try to put the device into the PPP discipline. 1984 */ 1985 if (ioctl(local_fd, TIOCSETD, &ppp_disc) < 0) { 1986 error("ioctl(TIOCSETD(PPP)): %m (line %d)", __LINE__); 1987 } else 1988 ret = 1; 1989 1990 close(local_fd); 1991 close(mfd); 1992 return ret; 1993} 1994 1995/******************************************************************** 1996 * 1997 * ppp_available - check whether the system has any ppp interfaces 1998 * (in fact we check whether we can do an ioctl on ppp0). 1999 */ 2000 2001int ppp_available(void) 2002{ 2003 int s, ok, fd; 2004 struct ifreq ifr; 2005 int size; 2006 int my_version, my_modification, my_patch; 2007 int osmaj, osmin, ospatch; 2008 2009 no_ppp_msg = 2010 "This system lacks kernel support for PPP. This could be because\n" 2011 "the PPP kernel module could not be loaded, or because PPP was not\n" 2012 "included in the kernel configuration. If PPP was included as a\n" 2013 "module, try `/sbin/modprobe -v ppp'. If that fails, check that\n" 2014 "ppp.o exists in /lib/modules/`uname -r`/net.\n" 2015 "See README.linux file in the ppp distribution for more details.\n"; 2016 2017 /* get the kernel version now, since we are called before sys_init */ 2018 uname(&utsname); 2019 osmaj = osmin = ospatch = 0; 2020 sscanf(utsname.release, "%d.%d.%d", &osmaj, &osmin, &ospatch); 2021 kernel_version = KVERSION(osmaj, osmin, ospatch); 2022 2023 fd = open("/dev/ppp", O_RDWR); 2024#if 0 2025 if (fd < 0 && errno == ENOENT) { 2026 /* try making it and see if that helps. */ 2027 if (mknod("/dev/ppp", S_IFCHR | S_IRUSR | S_IWUSR, 2028 makedev(108, 0)) >= 0) { 2029 fd = open("/dev/ppp", O_RDWR); 2030 if (fd >= 0) 2031 info("Created /dev/ppp device node"); 2032 else 2033 unlink("/dev/ppp"); /* didn't work, undo the mknod */ 2034 } else if (errno == EEXIST) { 2035 fd = open("/dev/ppp", O_RDWR); 2036 } 2037 } 2038#endif /* 0 */ 2039 if (fd >= 0) { 2040 new_style_driver = 1; 2041 2042 /* XXX should get from driver */ 2043 driver_version = 2; 2044 driver_modification = 4; 2045 driver_patch = 0; 2046 close(fd); 2047 return 1; 2048 } 2049 if (kernel_version >= KVERSION(2,3,13)) { 2050 if (errno == ENOENT) 2051 no_ppp_msg = 2052 "pppd is unable to open the /dev/ppp device.\n" 2053 "You need to create the /dev/ppp device node by\n" 2054 "executing the following command as root:\n" 2055 " mknod /dev/ppp c 108 0\n"; 2056 return 0; 2057 } 2058 2059/* 2060 * Open a socket for doing the ioctl operations. 2061 */ 2062 s = socket(AF_INET, SOCK_DGRAM, 0); 2063 if (s < 0) 2064 return 0; 2065 2066 strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name)); 2067 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0; 2068/* 2069 * If the device did not exist then attempt to create one by putting the 2070 * current tty into the PPP discipline. If this works then obtain the 2071 * flags for the device again. 2072 */ 2073 if (!ok) { 2074 if (ppp_registered()) { 2075 strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name)); 2076 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0; 2077 } 2078 } 2079/* 2080 * Ensure that the hardware address is for PPP and not something else 2081 */ 2082 if (ok) 2083 ok = ioctl (s, SIOCGIFHWADDR, (caddr_t) &ifr) >= 0; 2084 2085 if (ok && ((ifr.ifr_hwaddr.sa_family & ~0xFF) != ARPHRD_PPP)) 2086 ok = 0; 2087 2088/* 2089 * This is the PPP device. Validate the version of the driver at this 2090 * point to ensure that this program will work with the driver. 2091 */ 2092 if (ok) { 2093 char abBuffer [1024]; 2094 2095 ifr.ifr_data = abBuffer; 2096 size = ioctl (s, SIOCGPPPVER, (caddr_t) &ifr); 2097 if (size < 0) { 2098 error("Couldn't read driver version: %m"); 2099 ok = 0; 2100 no_ppp_msg = "Sorry, couldn't verify kernel driver version\n"; 2101 2102 } else { 2103 decode_version(abBuffer, 2104 &driver_version, 2105 &driver_modification, 2106 &driver_patch); 2107/* 2108 * Validate the version of the driver against the version that we used. 2109 */ 2110 decode_version(VERSION, 2111 &my_version, 2112 &my_modification, 2113 &my_patch); 2114 2115 /* The version numbers must match */ 2116 if (driver_version != my_version) 2117 ok = 0; 2118 2119 /* The modification levels must be legal */ 2120 if (driver_modification < 3) { 2121 if (driver_modification >= 2) { 2122 /* we can cope with 2.2.0 and above */ 2123 driver_is_old = 1; 2124 } else { 2125 ok = 0; 2126 } 2127 } 2128 2129 close (s); 2130 if (!ok) { 2131 slprintf(route_buffer, sizeof(route_buffer), 2132 "Sorry - PPP driver version %d.%d.%d is out of date\n", 2133 driver_version, driver_modification, driver_patch); 2134 2135 no_ppp_msg = route_buffer; 2136 } 2137 } 2138 } 2139 return ok; 2140} 2141 2142/******************************************************************** 2143 * 2144 * Update the wtmp file with the appropriate user name and tty device. 2145 */ 2146 2147void logwtmp (const char *line, const char *name, const char *host) 2148{ 2149 struct utmp ut, *utp; 2150 pid_t mypid = getpid(); 2151#if __GLIBC__ < 2 2152 int wtmp; 2153#endif 2154 2155/* 2156 * Update the signon database for users. 2157 * Christoph Lameter: Copied from poeigl-1.36 Jan 3, 1996 2158 */ 2159 utmpname(_PATH_UTMP); 2160 setutent(); 2161 while ((utp = getutent()) && (utp->ut_pid != mypid)) 2162 /* nothing */; 2163 2164 if (utp) 2165 memcpy(&ut, utp, sizeof(ut)); 2166 else 2167 /* some gettys/telnetds don't initialize utmp... */ 2168 memset(&ut, 0, sizeof(ut)); 2169 2170 if (ut.ut_id[0] == 0) 2171 strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id)); 2172 2173 strncpy(ut.ut_user, name, sizeof(ut.ut_user)); 2174 strncpy(ut.ut_line, line, sizeof(ut.ut_line)); 2175 2176 time(&ut.ut_time); 2177 2178 ut.ut_type = USER_PROCESS; 2179 ut.ut_pid = mypid; 2180 2181 /* Insert the host name if one is supplied */ 2182 if (*host) 2183 strncpy (ut.ut_host, host, sizeof(ut.ut_host)); 2184 2185 /* Insert the IP address of the remote system if IP is enabled */ 2186 if (ipcp_protent.enabled_flag && ipcp_hisoptions[0].neg_addr) 2187 memcpy(&ut.ut_addr, (char *) &ipcp_hisoptions[0].hisaddr, 2188 sizeof(ut.ut_addr)); 2189 2190 /* CL: Makes sure that the logout works */ 2191 if (*host == 0 && *name==0) 2192 ut.ut_host[0]=0; 2193 2194 pututline(&ut); 2195 endutent(); 2196/* 2197 * Update the wtmp file. 2198 */ 2199#if __GLIBC__ >= 2 2200 updwtmp(_PATH_WTMP, &ut); 2201#else 2202 wtmp = open(_PATH_WTMP, O_APPEND|O_WRONLY); 2203 if (wtmp >= 0) { 2204 flock(wtmp, LOCK_EX); 2205 2206 if (write (wtmp, (char *)&ut, sizeof(ut)) != sizeof(ut)) 2207 warn("error writing %s: %m", _PATH_WTMP); 2208 2209 flock(wtmp, LOCK_UN); 2210 2211 close (wtmp); 2212 } 2213#endif 2214} 2215 2216 2217/******************************************************************** 2218 * 2219 * sifvjcomp - config tcp header compression 2220 */ 2221 2222int sifvjcomp (int u, int vjcomp, int cidcomp, int maxcid) 2223{ 2224 u_int x; 2225 2226 if (vjcomp) { 2227 if (ioctl(ppp_dev_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) 2228 error("Couldn't set up TCP header compression: %m"); 2229 vjcomp = 0; 2230 } 2231 2232 x = (vjcomp? SC_COMP_TCP: 0) | (cidcomp? 0: SC_NO_TCP_CCID); 2233 modify_flags(ppp_dev_fd, SC_COMP_TCP|SC_NO_TCP_CCID, x); 2234 2235 return 1; 2236} 2237 2238/******************************************************************** 2239 * 2240 * sifup - Config the interface up and enable IP packets to pass. 2241 */ 2242 2243int sifup(int u) 2244{ 2245 struct ifreq ifr; 2246 2247 memset (&ifr, '\0', sizeof (ifr)); 2248 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); 2249 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) { 2250 if (! ok_error (errno)) 2251 error("ioctl (SIOCGIFFLAGS): %m (line %d)", __LINE__); 2252 return 0; 2253 } 2254 2255 ifr.ifr_flags |= (IFF_UP | IFF_POINTOPOINT); 2256 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) { 2257 if (! ok_error (errno)) 2258 error("ioctl(SIOCSIFFLAGS): %m (line %d)", __LINE__); 2259 return 0; 2260 } 2261 if_is_up++; 2262 2263 return 1; 2264} 2265 2266/******************************************************************** 2267 * 2268 * sifdown - Disable the indicated protocol and config the interface 2269 * down if there are no remaining protocols. 2270 */ 2271 2272int sifdown (int u) 2273{ 2274 struct ifreq ifr; 2275 2276 if (if_is_up && --if_is_up > 0) 2277 return 1; 2278 2279 memset (&ifr, '\0', sizeof (ifr)); 2280 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); 2281 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) { 2282 if (! ok_error (errno)) 2283 error("ioctl (SIOCGIFFLAGS): %m (line %d)", __LINE__); 2284 return 0; 2285 } 2286 2287 ifr.ifr_flags &= ~IFF_UP; 2288 ifr.ifr_flags |= IFF_POINTOPOINT; 2289 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) { 2290 if (! ok_error (errno)) 2291 error("ioctl(SIOCSIFFLAGS): %m (line %d)", __LINE__); 2292 return 0; 2293 } 2294 return 1; 2295} 2296 2297/******************************************************************** 2298 * 2299 * sifaddr - Config the interface IP addresses and netmask. 2300 */ 2301 2302int sifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr, 2303 u_int32_t net_mask) 2304{ 2305 struct ifreq ifr; 2306 struct rtentry rt; 2307 2308 memset (&ifr, '\0', sizeof (ifr)); 2309 memset (&rt, '\0', sizeof (rt)); 2310 2311 SET_SA_FAMILY (ifr.ifr_addr, AF_INET); 2312 SET_SA_FAMILY (ifr.ifr_dstaddr, AF_INET); 2313 SET_SA_FAMILY (ifr.ifr_netmask, AF_INET); 2314 2315 strlcpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); 2316/* 2317 * Set our IP address 2318 */ 2319 SIN_ADDR(ifr.ifr_addr) = our_adr; 2320 if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0) { 2321 if (errno != EEXIST) { 2322 if (! ok_error (errno)) 2323 error("ioctl(SIOCSIFADDR): %m (line %d)", __LINE__); 2324 } 2325 else { 2326 warn("ioctl(SIOCSIFADDR): Address already exists"); 2327 } 2328 return (0); 2329 } 2330/* 2331 * Set the gateway address 2332 */ 2333 SIN_ADDR(ifr.ifr_dstaddr) = his_adr; 2334 if (ioctl(sock_fd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) { 2335 if (! ok_error (errno)) 2336 error("ioctl(SIOCSIFDSTADDR): %m (line %d)", __LINE__); 2337 return (0); 2338 } 2339/* 2340 * Set the netmask. 2341 * For recent kernels, force the netmask to 255.255.255.255. 2342 */ 2343 if (kernel_version >= KVERSION(2,1,16)) 2344 net_mask = ~0L; 2345 if (net_mask != 0) { 2346 SIN_ADDR(ifr.ifr_netmask) = net_mask; 2347 if (ioctl(sock_fd, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) { 2348 if (! ok_error (errno)) 2349 error("ioctl(SIOCSIFNETMASK): %m (line %d)", __LINE__); 2350 return (0); 2351 } 2352 } 2353/* 2354 * Add the device route 2355 */ 2356 if (kernel_version < KVERSION(2,1,16)) { 2357 SET_SA_FAMILY (rt.rt_dst, AF_INET); 2358 SET_SA_FAMILY (rt.rt_gateway, AF_INET); 2359 rt.rt_dev = ifname; 2360 2361 SIN_ADDR(rt.rt_gateway) = 0L; 2362 SIN_ADDR(rt.rt_dst) = his_adr; 2363 rt.rt_flags = RTF_UP | RTF_HOST; 2364 2365 if (kernel_version > KVERSION(2,1,0)) { 2366 SET_SA_FAMILY (rt.rt_genmask, AF_INET); 2367 SIN_ADDR(rt.rt_genmask) = -1L; 2368 } 2369 2370 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) { 2371 if (! ok_error (errno)) 2372 error("ioctl(SIOCADDRT) device route: %m (line %d)", __LINE__); 2373 return (0); 2374 } 2375 } 2376 2377 /* set ip_dynaddr in demand mode if address changes */ 2378 if (demand && tune_kernel && !dynaddr_set 2379 && our_old_addr && our_old_addr != our_adr) { 2380 /* set ip_dynaddr if possible */ 2381 char *path; 2382 int fd; 2383 2384 path = path_to_procfs("/sys/net/ipv4/ip_dynaddr"); 2385 if (path != 0 && (fd = open(path, O_WRONLY)) >= 0) { 2386 if (write(fd, "1", 1) != 1) 2387 error("Couldn't enable dynamic IP addressing: %m"); 2388 close(fd); 2389 } 2390 dynaddr_set = 1; /* only 1 attempt */ 2391 } 2392 our_old_addr = 0; 2393 2394 return 1; 2395} 2396 2397/******************************************************************** 2398 * 2399 * cifaddr - Clear the interface IP addresses, and delete routes 2400 * through the interface if possible. 2401 */ 2402 2403int cifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr) 2404{ 2405 struct ifreq ifr; 2406 2407 if (kernel_version < KVERSION(2,1,16)) { 2408/* 2409 * Delete the route through the device 2410 */ 2411 struct rtentry rt; 2412 memset (&rt, '\0', sizeof (rt)); 2413 2414 SET_SA_FAMILY (rt.rt_dst, AF_INET); 2415 SET_SA_FAMILY (rt.rt_gateway, AF_INET); 2416 rt.rt_dev = ifname; 2417 2418 SIN_ADDR(rt.rt_gateway) = 0; 2419 SIN_ADDR(rt.rt_dst) = his_adr; 2420 rt.rt_flags = RTF_UP | RTF_HOST; 2421 2422 if (kernel_version > KVERSION(2,1,0)) { 2423 SET_SA_FAMILY (rt.rt_genmask, AF_INET); 2424 SIN_ADDR(rt.rt_genmask) = -1L; 2425 } 2426 2427 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) { 2428 if (still_ppp() && ! ok_error (errno)) 2429 error("ioctl(SIOCDELRT) device route: %m (line %d)", __LINE__); 2430 return (0); 2431 } 2432 } 2433 2434 /* This way it is possible to have an IPX-only or IPv6-only interface */ 2435 memset(&ifr, 0, sizeof(ifr)); 2436 SET_SA_FAMILY(ifr.ifr_addr, AF_INET); 2437 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); 2438 2439 if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0) { 2440 if (! ok_error (errno)) { 2441 error("ioctl(SIOCSIFADDR): %m (line %d)", __LINE__); 2442 return 0; 2443 } 2444 } 2445 2446 our_old_addr = our_adr; 2447 2448 return 1; 2449} 2450 2451#ifdef INET6 2452/******************************************************************** 2453 * 2454 * sif6addr - Config the interface with an IPv6 link-local address 2455 */ 2456int sif6addr (int unit, eui64_t our_eui64, eui64_t his_eui64) 2457{ 2458 struct in6_ifreq ifr6; 2459 struct ifreq ifr; 2460 struct in6_rtmsg rt6; 2461 2462 if (sock6_fd < 0) { 2463 errno = -sock6_fd; 2464 error("IPv6 socket creation failed: %m"); 2465 return 0; 2466 } 2467 memset(&ifr, 0, sizeof (ifr)); 2468 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); 2469 if (ioctl(sock6_fd, SIOCGIFINDEX, (caddr_t) &ifr) < 0) { 2470 error("sif6addr: ioctl(SIOCGIFINDEX): %m (line %d)", __LINE__); 2471 return 0; 2472 } 2473 2474 /* Local interface */ 2475 memset(&ifr6, 0, sizeof(ifr6)); 2476 IN6_LLADDR_FROM_EUI64(ifr6.ifr6_addr, our_eui64); 2477 ifr6.ifr6_ifindex = ifr.ifr_ifindex; 2478 ifr6.ifr6_prefixlen = 10; 2479 2480 if (ioctl(sock6_fd, SIOCSIFADDR, &ifr6) < 0) { 2481 error("sif6addr: ioctl(SIOCSIFADDR): %m (line %d)", __LINE__); 2482 return 0; 2483 } 2484 2485 /* Route to remote host */ 2486 memset(&rt6, 0, sizeof(rt6)); 2487 IN6_LLADDR_FROM_EUI64(rt6.rtmsg_dst, his_eui64); 2488 rt6.rtmsg_flags = RTF_UP; 2489 rt6.rtmsg_dst_len = 10; 2490 rt6.rtmsg_ifindex = ifr.ifr_ifindex; 2491 rt6.rtmsg_metric = 1; 2492 2493 if (ioctl(sock6_fd, SIOCADDRT, &rt6) < 0) { 2494 error("sif6addr: ioctl(SIOCADDRT): %m (line %d)", __LINE__); 2495 return 0; 2496 } 2497 2498 return 1; 2499} 2500 2501 2502/******************************************************************** 2503 * 2504 * cif6addr - Remove IPv6 address from interface 2505 */ 2506int cif6addr (int unit, eui64_t our_eui64, eui64_t his_eui64) 2507{ 2508 struct ifreq ifr; 2509 struct in6_ifreq ifr6; 2510 2511 if (sock6_fd < 0) { 2512 errno = -sock6_fd; 2513 error("IPv6 socket creation failed: %m"); 2514 return 0; 2515 } 2516 memset(&ifr, 0, sizeof(ifr)); 2517 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); 2518 if (ioctl(sock6_fd, SIOCGIFINDEX, (caddr_t) &ifr) < 0) { 2519 error("cif6addr: ioctl(SIOCGIFINDEX): %m (line %d)", __LINE__); 2520 return 0; 2521 } 2522 2523 memset(&ifr6, 0, sizeof(ifr6)); 2524 IN6_LLADDR_FROM_EUI64(ifr6.ifr6_addr, our_eui64); 2525 ifr6.ifr6_ifindex = ifr.ifr_ifindex; 2526 ifr6.ifr6_prefixlen = 10; 2527 2528 if (ioctl(sock6_fd, SIOCDIFADDR, &ifr6) < 0) { 2529 if (errno != EADDRNOTAVAIL) { 2530 if (! ok_error (errno)) 2531 error("cif6addr: ioctl(SIOCDIFADDR): %m (line %d)", __LINE__); 2532 } 2533 else { 2534 warn("cif6addr: ioctl(SIOCDIFADDR): No such address"); 2535 } 2536 return (0); 2537 } 2538 return 1; 2539} 2540#endif /* INET6 */ 2541 2542/* 2543 * get_pty - get a pty master/slave pair and chown the slave side 2544 * to the uid given. Assumes slave_name points to >= 16 bytes of space. 2545 */ 2546int 2547get_pty(master_fdp, slave_fdp, slave_name, uid) 2548 int *master_fdp; 2549 int *slave_fdp; 2550 char *slave_name; 2551 int uid; 2552{ 2553 int i, mfd, sfd = -1; 2554 char pty_name[16]; 2555 struct termios tios; 2556 2557#ifdef TIOCGPTN 2558 /* 2559 * Try the unix98 way first. 2560 */ 2561 mfd = open("/dev/ptmx", O_RDWR); 2562 if (mfd >= 0) { 2563 int ptn; 2564 if (ioctl(mfd, TIOCGPTN, &ptn) >= 0) { 2565 slprintf(pty_name, sizeof(pty_name), "/dev/pts/%d", ptn); 2566 chmod(pty_name, S_IRUSR | S_IWUSR); 2567#ifdef TIOCSPTLCK 2568 ptn = 0; 2569 if (ioctl(mfd, TIOCSPTLCK, &ptn) < 0) 2570 warn("Couldn't unlock pty slave %s: %m", pty_name); 2571#endif 2572 if ((sfd = open(pty_name, O_RDWR | O_NOCTTY)) < 0) 2573 warn("Couldn't open pty slave %s: %m", pty_name); 2574 } 2575 } 2576#endif /* TIOCGPTN */ 2577 2578 if (sfd < 0) { 2579 /* the old way - scan through the pty name space */ 2580 for (i = 0; i < 64; ++i) { 2581 slprintf(pty_name, sizeof(pty_name), "/dev/pty%c%x", 2582 'p' + i / 16, i % 16); 2583 mfd = open(pty_name, O_RDWR, 0); 2584 if (mfd >= 0) { 2585 pty_name[5] = 't'; 2586 sfd = open(pty_name, O_RDWR | O_NOCTTY, 0); 2587 if (sfd >= 0) { 2588 fchown(sfd, uid, -1); 2589 fchmod(sfd, S_IRUSR | S_IWUSR); 2590 break; 2591 } 2592 close(mfd); 2593 } 2594 } 2595 } 2596 2597 if (sfd < 0) 2598 return 0; 2599 2600 strlcpy(slave_name, pty_name, 16); 2601 *master_fdp = mfd; 2602 *slave_fdp = sfd; 2603 if (tcgetattr(sfd, &tios) == 0) { 2604 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB); 2605 tios.c_cflag |= CS8 | CREAD | CLOCAL; 2606 tios.c_iflag = IGNPAR; 2607 tios.c_oflag = 0; 2608 tios.c_lflag = 0; 2609 if (tcsetattr(sfd, TCSAFLUSH, &tios) < 0) 2610 warn("couldn't set attributes on pty: %m"); 2611 } else 2612 warn("couldn't get attributes on pty: %m"); 2613 2614 return 1; 2615} 2616 2617/******************************************************************** 2618 * 2619 * open_loopback - open the device we use for getting packets 2620 * in demand mode. Under Linux, we use a pty master/slave pair. 2621 */ 2622int 2623open_ppp_loopback(void) 2624{ 2625 int flags; 2626 2627 looped = 1; 2628 if (new_style_driver) { 2629 /* allocate ourselves a ppp unit */ 2630 if (make_ppp_unit() < 0) 2631 die(1); 2632 modify_flags(ppp_dev_fd, 0, SC_LOOP_TRAFFIC); 2633 set_kdebugflag(kdebugflag); 2634 ppp_fd = -1; 2635 return ppp_dev_fd; 2636 } 2637 2638 if (!get_pty(&master_fd, &slave_fd, loop_name, 0)) 2639 fatal("No free pty for loopback"); 2640 2641 set_ppp_fd(slave_fd); 2642 2643 flags = fcntl(master_fd, F_GETFL); 2644 if (flags == -1 || 2645 fcntl(master_fd, F_SETFL, flags | O_NONBLOCK) == -1) 2646 warn("couldn't set master loopback to nonblock: %m"); 2647 2648 flags = fcntl(ppp_fd, F_GETFL); 2649 if (flags == -1 || 2650 fcntl(ppp_fd, F_SETFL, flags | O_NONBLOCK) == -1) 2651 warn("couldn't set slave loopback to nonblock: %m"); 2652 2653 if (ioctl(ppp_fd, TIOCSETD, &ppp_disc) < 0) 2654 fatal("ioctl(TIOCSETD): %m (line %d)", __LINE__); 2655/* 2656 * Find out which interface we were given. 2657 */ 2658 if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0) 2659 fatal("ioctl(PPPIOCGUNIT): %m (line %d)", __LINE__); 2660/* 2661 * Enable debug in the driver if requested. 2662 */ 2663 set_kdebugflag (kdebugflag); 2664 2665 return master_fd; 2666} 2667 2668/******************************************************************** 2669 * 2670 * sifnpmode - Set the mode for handling packets for a given NP. 2671 */ 2672 2673int 2674sifnpmode(u, proto, mode) 2675 int u; 2676 int proto; 2677 enum NPmode mode; 2678{ 2679 struct npioctl npi; 2680 2681 npi.protocol = proto; 2682 npi.mode = mode; 2683 if (ioctl(ppp_dev_fd, PPPIOCSNPMODE, (caddr_t) &npi) < 0) { 2684 if (! ok_error (errno)) 2685 error("ioctl(PPPIOCSNPMODE, %d, %d): %m", proto, mode); 2686 return 0; 2687 } 2688 return 1; 2689} 2690 2691 2692/******************************************************************** 2693 * 2694 * sipxfaddr - Config the interface IPX networknumber 2695 */ 2696 2697int sipxfaddr (int unit, unsigned long int network, unsigned char * node ) 2698{ 2699 int result = 1; 2700 2701#ifdef IPX_CHANGE 2702 int skfd; 2703 struct ifreq ifr; 2704 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr; 2705 2706 skfd = socket (AF_IPX, SOCK_DGRAM, 0); 2707 if (skfd < 0) { 2708 if (! ok_error (errno)) 2709 dbglog("socket(AF_IPX): %m (line %d)", __LINE__); 2710 result = 0; 2711 } 2712 else { 2713 memset (&ifr, '\0', sizeof (ifr)); 2714 strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); 2715 2716 memcpy (sipx->sipx_node, node, IPX_NODE_LEN); 2717 sipx->sipx_family = AF_IPX; 2718 sipx->sipx_port = 0; 2719 sipx->sipx_network = htonl (network); 2720 sipx->sipx_type = IPX_FRAME_ETHERII; 2721 sipx->sipx_action = IPX_CRTITF; 2722/* 2723 * Set the IPX device 2724 */ 2725 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) { 2726 result = 0; 2727 if (errno != EEXIST) { 2728 if (! ok_error (errno)) 2729 dbglog("ioctl(SIOCSIFADDR, CRTITF): %m (line %d)", __LINE__); 2730 } 2731 else { 2732 warn("ioctl(SIOCSIFADDR, CRTITF): Address already exists"); 2733 } 2734 } 2735 close (skfd); 2736 } 2737#endif 2738 return result; 2739} 2740 2741/******************************************************************** 2742 * 2743 * cipxfaddr - Clear the information for the IPX network. The IPX routes 2744 * are removed and the device is no longer able to pass IPX 2745 * frames. 2746 */ 2747 2748int cipxfaddr (int unit) 2749{ 2750 int result = 1; 2751 2752#ifdef IPX_CHANGE 2753 int skfd; 2754 struct ifreq ifr; 2755 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr; 2756 2757 skfd = socket (AF_IPX, SOCK_DGRAM, 0); 2758 if (skfd < 0) { 2759 if (! ok_error (errno)) 2760 dbglog("socket(AF_IPX): %m (line %d)", __LINE__); 2761 result = 0; 2762 } 2763 else { 2764 memset (&ifr, '\0', sizeof (ifr)); 2765 strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); 2766 2767 sipx->sipx_type = IPX_FRAME_ETHERII; 2768 sipx->sipx_action = IPX_DLTITF; 2769 sipx->sipx_family = AF_IPX; 2770/* 2771 * Set the IPX device 2772 */ 2773 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) { 2774 if (! ok_error (errno)) 2775 info("ioctl(SIOCSIFADDR, IPX_DLTITF): %m (line %d)", __LINE__); 2776 result = 0; 2777 } 2778 close (skfd); 2779 } 2780#endif 2781 return result; 2782} 2783 2784/* 2785 * Use the hostname as part of the random number seed. 2786 */ 2787int 2788get_host_seed() 2789{ 2790 int h; 2791 char *p = hostname; 2792 2793 h = 407; 2794 for (p = hostname; *p != 0; ++p) 2795 h = h * 37 + *p; 2796 return h; 2797} 2798 2799/******************************************************************** 2800 * 2801 * sys_check_options - check the options that the user specified 2802 */ 2803 2804int 2805sys_check_options(void) 2806{ 2807#ifdef IPX_CHANGE 2808/* 2809 * Disable the IPX protocol if the support is not present in the kernel. 2810 */ 2811 char *path; 2812 2813 if (ipxcp_protent.enabled_flag) { 2814 struct stat stat_buf; 2815 if ((path = path_to_procfs("/net/ipx/interface")) == 0 2816 || (path = path_to_procfs("/net/ipx_interface")) == 0 2817 || lstat(path, &stat_buf) < 0) { 2818 error("IPX support is not present in the kernel\n"); 2819 ipxcp_protent.enabled_flag = 0; 2820 } 2821 } 2822#endif 2823 if (demand && driver_is_old) { 2824 option_error("demand dialling is not supported by kernel driver " 2825 "version %d.%d.%d", driver_version, driver_modification, 2826 driver_patch); 2827 return 0; 2828 } 2829 if (multilink && !new_style_driver) { 2830 warn("Warning: multilink is not supported by the kernel driver"); 2831 multilink = 0; 2832 } 2833 return 1; 2834} 2835 2836#ifdef INET6 2837/* 2838 * ether_to_eui64 - Convert 48-bit Ethernet address into 64-bit EUI 2839 * 2840 * convert the 48-bit MAC address of eth0 into EUI 64. caller also assumes 2841 * that the system has a properly configured Ethernet interface for this 2842 * function to return non-zero. 2843 */ 2844int 2845ether_to_eui64(eui64_t *p_eui64) 2846{ 2847 struct ifreq ifr; 2848 int skfd; 2849 const unsigned char *ptr; 2850 2851 skfd = socket(PF_INET6, SOCK_DGRAM, 0); 2852 if(skfd == -1) 2853 { 2854 warn("could not open IPv6 socket"); 2855 return 0; 2856 } 2857 2858 strcpy(ifr.ifr_name, "eth0"); 2859 if(ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0) 2860 { 2861 close(skfd); 2862 warn("could not obtain hardware address for eth0"); 2863 return 0; 2864 } 2865 close(skfd); 2866 2867 /* 2868 * And convert the EUI-48 into EUI-64, per RFC 2472 [sec 4.1] 2869 */ 2870 ptr = ifr.ifr_hwaddr.sa_data; 2871 p_eui64->e8[0] = ptr[0] | 0x02; 2872 p_eui64->e8[1] = ptr[1]; 2873 p_eui64->e8[2] = ptr[2]; 2874 p_eui64->e8[3] = 0xFF; 2875 p_eui64->e8[4] = 0xFE; 2876 p_eui64->e8[5] = ptr[3]; 2877 p_eui64->e8[6] = ptr[4]; 2878 p_eui64->e8[7] = ptr[5]; 2879 2880 return 1; 2881} 2882#endif 2883