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