1 /* $OpenBSD: arp.c,v 1.81 2018/04/26 12:42:51 guenther Exp $ */ 2 /* $NetBSD: arp.c,v 1.12 1995/04/24 13:25:18 cgd Exp $ */ 3 4 /* 5 * Copyright (c) 1984, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Sun Microsystems, Inc. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 /* 37 * arp - display, set, delete arp table entries and wake up hosts. 38 */ 39 40 #include <sys/socket.h> 41 #include <sys/sysctl.h> 42 #include <sys/ioctl.h> 43 #include <net/bpf.h> 44 #include <net/if.h> 45 #include <net/if_dl.h> 46 #include <net/if_types.h> 47 #include <net/route.h> 48 #include <netinet/in.h> 49 #include <netinet/if_ether.h> 50 #include <arpa/inet.h> 51 52 #include <netdb.h> 53 #include <errno.h> 54 #include <err.h> 55 #include <fcntl.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <time.h> 60 #include <unistd.h> 61 #include <limits.h> 62 #include <ifaddrs.h> 63 64 void dump(void); 65 int delete(const char *); 66 void search(in_addr_t addr, void (*action)(struct sockaddr_dl *sdl, 67 struct sockaddr_inarp *sin, struct rt_msghdr *rtm)); 68 void print_entry(struct sockaddr_dl *sdl, 69 struct sockaddr_inarp *sin, struct rt_msghdr *rtm); 70 void nuke_entry(struct sockaddr_dl *sdl, 71 struct sockaddr_inarp *sin, struct rt_msghdr *rtm); 72 static char *ether_str(struct sockaddr_dl *); 73 int wake(const char *ether_addr, const char *iface); 74 int file(char *); 75 int get(const char *); 76 int getinetaddr(const char *, struct in_addr *); 77 void getsocket(void); 78 int rtget(struct sockaddr_inarp **, struct sockaddr_dl **); 79 int rtmsg(int); 80 int set(int, char **); 81 void usage(void); 82 static char *sec2str(time_t); 83 84 static pid_t pid; 85 static int replace; /* replace entries when adding */ 86 static int nflag; /* no reverse dns lookups */ 87 static int aflag; /* do it for all entries */ 88 static int rtsock = -1; 89 static int rdomain; 90 91 extern int h_errno; 92 93 /* ROUNDUP() is nasty, but it is identical to what's in the kernel. */ 94 #define ROUNDUP(a) \ 95 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 96 97 /* which function we're supposed to do */ 98 #define F_GET 1 99 #define F_SET 2 100 #define F_FILESET 3 101 #define F_DELETE 4 102 #define F_WAKE 5 103 104 int 105 main(int argc, char *argv[]) 106 { 107 int ch, func = 0, error = 0; 108 const char *errstr; 109 110 pid = getpid(); 111 opterr = 0; 112 rdomain = getrtable(); 113 while ((ch = getopt(argc, argv, "andsFfV:W")) != -1) { 114 switch (ch) { 115 case 'a': 116 aflag = 1; 117 break; 118 case 'n': 119 nflag = 1; 120 break; 121 case 'd': 122 if (func) 123 usage(); 124 func = F_DELETE; 125 break; 126 case 's': 127 if (func) 128 usage(); 129 func = F_SET; 130 break; 131 case 'F': 132 replace = 1; 133 break; 134 case 'f': 135 if (func) 136 usage(); 137 func = F_FILESET; 138 break; 139 case 'V': 140 rdomain = strtonum(optarg, 0, RT_TABLEID_MAX, &errstr); 141 if (errstr != NULL) { 142 warn("bad rdomain: %s", errstr); 143 usage(); 144 } 145 break; 146 case 'W': 147 if (func) 148 usage(); 149 func = F_WAKE; 150 break; 151 default: 152 usage(); 153 break; 154 } 155 } 156 argc -= optind; 157 argv += optind; 158 159 if (!func) 160 func = F_GET; 161 162 switch (func) { 163 case F_GET: 164 if (aflag && argc == 0) 165 dump(); 166 else if (!aflag && argc == 1) 167 error = get(argv[0]); 168 else 169 usage(); 170 break; 171 case F_SET: 172 if (argc < 2 || argc > 5) 173 usage(); 174 if (replace) 175 delete(argv[0]); 176 error = set(argc, argv) ? 1 : 0; 177 break; 178 case F_DELETE: 179 if (aflag && argc == 0) 180 search(0, nuke_entry); 181 else if (!aflag && argc == 1) 182 error = delete(argv[0]); 183 else 184 usage(); 185 break; 186 case F_FILESET: 187 if (argc != 1) 188 usage(); 189 error = file(argv[0]); 190 break; 191 case F_WAKE: 192 if (aflag || nflag || replace || rdomain > 0) 193 usage(); 194 if (argc == 1) 195 error = wake(argv[0], NULL); 196 else if (argc == 2) 197 error = wake(argv[0], argv[1]); 198 else 199 usage(); 200 break; 201 } 202 return (error); 203 } 204 205 /* 206 * Process a file to set standard arp entries 207 */ 208 int 209 file(char *name) 210 { 211 char line[100], arg[5][50], *args[5]; 212 int i, retval; 213 FILE *fp; 214 215 if ((fp = fopen(name, "r")) == NULL) 216 err(1, "cannot open %s", name); 217 args[0] = &arg[0][0]; 218 args[1] = &arg[1][0]; 219 args[2] = &arg[2][0]; 220 args[3] = &arg[3][0]; 221 args[4] = &arg[4][0]; 222 retval = 0; 223 while (fgets(line, sizeof(line), fp) != NULL) { 224 i = sscanf(line, "%49s %49s %49s %49s %49s", arg[0], arg[1], 225 arg[2], arg[3], arg[4]); 226 if (i < 2) { 227 warnx("bad line: %s", line); 228 retval = 1; 229 continue; 230 } 231 if (replace) 232 delete(arg[0]); 233 if (set(i, args)) 234 retval = 1; 235 } 236 fclose(fp); 237 return (retval); 238 } 239 240 void 241 getsocket(void) 242 { 243 socklen_t len = sizeof(rdomain); 244 245 if (rtsock >= 0) 246 return; 247 rtsock = socket(PF_ROUTE, SOCK_RAW, 0); 248 if (rtsock < 0) 249 err(1, "routing socket"); 250 if (setsockopt(rtsock, PF_ROUTE, ROUTE_TABLEFILTER, &rdomain, len) < 0) 251 err(1, "ROUTE_TABLEFILTER"); 252 253 if (pledge("stdio dns", NULL) == -1) 254 err(1, "pledge"); 255 } 256 257 struct sockaddr_in so_mask = { 8, 0, 0, { 0xffffffff } }; 258 struct sockaddr_inarp blank_sin = { sizeof(blank_sin), AF_INET }, sin_m; 259 struct sockaddr_dl blank_sdl = { sizeof(blank_sdl), AF_LINK }, sdl_m; 260 struct sockaddr_dl ifp_m = { sizeof(&ifp_m), AF_LINK }; 261 time_t expire_time; 262 int flags, export_only, doing_proxy, found_entry; 263 struct { 264 struct rt_msghdr m_rtm; 265 char m_space[512]; 266 } m_rtmsg; 267 268 /* 269 * Set an individual arp entry 270 */ 271 int 272 set(int argc, char *argv[]) 273 { 274 struct sockaddr_inarp *sin; 275 struct sockaddr_dl *sdl; 276 struct rt_msghdr *rtm; 277 char *eaddr = argv[1], *host = argv[0]; 278 struct ether_addr *ea; 279 280 sin = &sin_m; 281 rtm = &(m_rtmsg.m_rtm); 282 283 getsocket(); 284 argc -= 2; 285 argv += 2; 286 sdl_m = blank_sdl; /* struct copy */ 287 sin_m = blank_sin; /* struct copy */ 288 if (getinetaddr(host, &sin->sin_addr) == -1) 289 return (1); 290 ea = ether_aton(eaddr); 291 if (ea == NULL) 292 errx(1, "invalid ethernet address: %s", eaddr); 293 memcpy(LLADDR(&sdl_m), ea, sizeof(*ea)); 294 sdl_m.sdl_alen = 6; 295 expire_time = 0; 296 doing_proxy = flags = export_only = 0; 297 while (argc-- > 0) { 298 if (strncmp(argv[0], "temp", 4) == 0) { 299 expire_time = time(NULL) + 20 * 60; 300 if (flags & RTF_PERMANENT_ARP) { 301 /* temp or permanent, not both */ 302 usage(); 303 return (0); 304 } 305 } else if (strncmp(argv[0], "pub", 3) == 0) { 306 flags |= RTF_ANNOUNCE; 307 doing_proxy = SIN_PROXY; 308 } else if (strncmp(argv[0], "permanent", 9) == 0) { 309 flags |= RTF_PERMANENT_ARP; 310 if (expire_time != 0) { 311 /* temp or permanent, not both */ 312 usage(); 313 return (0); 314 } 315 } 316 317 argv++; 318 } 319 320 tryagain: 321 if (rtget(&sin, &sdl)) { 322 warn("%s", host); 323 return (1); 324 } 325 326 if (sin->sin_addr.s_addr == sin_m.sin_addr.s_addr) { 327 if (sdl->sdl_family == AF_LINK && 328 (rtm->rtm_flags & RTF_LLINFO) && 329 !(rtm->rtm_flags & RTF_GATEWAY)) 330 switch (sdl->sdl_type) { 331 case IFT_ETHER: 332 case IFT_FDDI: 333 case IFT_ISO88023: 334 case IFT_ISO88024: 335 case IFT_ISO88025: 336 case IFT_CARP: 337 goto overwrite; 338 } 339 340 if (doing_proxy == 0) { 341 printf("set: can only proxy for %s\n", host); 342 return (1); 343 } 344 if (sin_m.sin_other & SIN_PROXY) { 345 printf("set: proxy entry exists for non 802 device\n"); 346 return (1); 347 } 348 sin_m.sin_other = SIN_PROXY; 349 export_only = 1; 350 goto tryagain; 351 } 352 353 overwrite: 354 if (sdl->sdl_family != AF_LINK) { 355 printf("cannot intuit interface index and type for %s\n", host); 356 return (1); 357 } 358 sdl_m.sdl_type = sdl->sdl_type; 359 sdl_m.sdl_index = sdl->sdl_index; 360 return (rtmsg(RTM_ADD)); 361 } 362 363 #define W_ADDR 36 364 #define W_LL 17 365 #define W_IF 7 366 367 /* 368 * Display an individual arp entry 369 */ 370 int 371 get(const char *host) 372 { 373 struct sockaddr_inarp *sin; 374 375 sin = &sin_m; 376 sin_m = blank_sin; /* struct copy */ 377 if (getinetaddr(host, &sin->sin_addr) == -1) 378 exit(1); 379 380 printf("%-*.*s %-*.*s %*.*s %-9.9s %5s\n", 381 W_ADDR, W_ADDR, "Host", W_LL, W_LL, "Ethernet Address", 382 W_IF, W_IF, "Netif", "Expire", "Flags"); 383 384 search(sin->sin_addr.s_addr, print_entry); 385 if (found_entry == 0) { 386 printf("%-*.*s no entry\n", W_ADDR, W_ADDR, 387 inet_ntoa(sin->sin_addr)); 388 return (1); 389 } 390 return (0); 391 } 392 393 /* 394 * Delete an arp entry 395 */ 396 int 397 delete(const char *host) 398 { 399 struct sockaddr_inarp *sin; 400 struct rt_msghdr *rtm; 401 struct sockaddr_dl *sdl; 402 403 sin = &sin_m; 404 rtm = &m_rtmsg.m_rtm; 405 406 getsocket(); 407 sin_m = blank_sin; /* struct copy */ 408 if (getinetaddr(host, &sin->sin_addr) == -1) 409 return (1); 410 tryagain: 411 if (rtget(&sin, &sdl)) { 412 warn("%s", host); 413 return (1); 414 } 415 if (sin->sin_addr.s_addr == sin_m.sin_addr.s_addr) { 416 if (sdl->sdl_family == AF_LINK && rtm->rtm_flags & RTF_LLINFO) { 417 if (rtm->rtm_flags & RTF_LOCAL) 418 return (0); 419 if (!(rtm->rtm_flags & RTF_GATEWAY)) 420 switch (sdl->sdl_type) { 421 case IFT_ETHER: 422 case IFT_FDDI: 423 case IFT_ISO88023: 424 case IFT_ISO88024: 425 case IFT_ISO88025: 426 case IFT_CARP: 427 goto delete; 428 } 429 } 430 } 431 432 if (sin_m.sin_other & SIN_PROXY) { 433 warnx("delete: can't locate %s", host); 434 return (1); 435 } else { 436 sin_m.sin_other = SIN_PROXY; 437 goto tryagain; 438 } 439 delete: 440 if (sdl->sdl_family != AF_LINK) { 441 printf("cannot locate %s\n", host); 442 return (1); 443 } 444 if (rtmsg(RTM_DELETE)) 445 return (1); 446 printf("%s (%s) deleted\n", host, inet_ntoa(sin->sin_addr)); 447 return (0); 448 } 449 450 /* 451 * Search the entire arp table, and do some action on matching entries. 452 */ 453 void 454 search(in_addr_t addr, void (*action)(struct sockaddr_dl *sdl, 455 struct sockaddr_inarp *sin, struct rt_msghdr *rtm)) 456 { 457 int mib[7]; 458 size_t needed; 459 char *lim, *buf = NULL, *next; 460 struct rt_msghdr *rtm; 461 struct sockaddr_inarp *sin; 462 struct sockaddr_dl *sdl; 463 464 mib[0] = CTL_NET; 465 mib[1] = PF_ROUTE; 466 mib[2] = 0; 467 mib[3] = AF_INET; 468 mib[4] = NET_RT_FLAGS; 469 mib[5] = RTF_LLINFO; 470 mib[6] = rdomain; 471 while (1) { 472 if (sysctl(mib, 7, NULL, &needed, NULL, 0) == -1) 473 err(1, "route-sysctl-estimate"); 474 if (needed == 0) 475 return; 476 if ((buf = realloc(buf, needed)) == NULL) 477 err(1, "malloc"); 478 if (sysctl(mib, 7, buf, &needed, NULL, 0) == -1) { 479 if (errno == ENOMEM) 480 continue; 481 err(1, "actual retrieval of routing table"); 482 } 483 lim = buf + needed; 484 break; 485 } 486 for (next = buf; next < lim; next += rtm->rtm_msglen) { 487 rtm = (struct rt_msghdr *)next; 488 if (rtm->rtm_version != RTM_VERSION) 489 continue; 490 sin = (struct sockaddr_inarp *)(next + rtm->rtm_hdrlen); 491 sdl = (struct sockaddr_dl *)(sin + 1); 492 if (addr) { 493 if (addr != sin->sin_addr.s_addr) 494 continue; 495 found_entry = 1; 496 } 497 (*action)(sdl, sin, rtm); 498 } 499 free(buf); 500 } 501 502 /* 503 * Dump the entire ARP table 504 */ 505 void 506 dump(void) 507 { 508 printf("%-*.*s %-*.*s %*.*s %-9.9s %5s\n", 509 W_ADDR, W_ADDR, "Host", W_LL, W_LL, "Ethernet Address", 510 W_IF, W_IF, "Netif", "Expire", "Flags"); 511 512 search(0, print_entry); 513 } 514 515 /* 516 * Display an arp entry 517 */ 518 void 519 print_entry(struct sockaddr_dl *sdl, struct sockaddr_inarp *sin, 520 struct rt_msghdr *rtm) 521 { 522 char ifix_buf[IFNAMSIZ], *ifname, *host; 523 struct hostent *hp = NULL; 524 int addrwidth, llwidth, ifwidth ; 525 time_t now; 526 527 now = time(NULL); 528 529 if (nflag == 0) 530 hp = gethostbyaddr((caddr_t)&(sin->sin_addr), 531 sizeof(sin->sin_addr), AF_INET); 532 if (hp) 533 host = hp->h_name; 534 else 535 host = inet_ntoa(sin->sin_addr); 536 537 addrwidth = strlen(host); 538 if (addrwidth < W_ADDR) 539 addrwidth = W_ADDR; 540 llwidth = strlen(ether_str(sdl)); 541 if (W_ADDR + W_LL - addrwidth > llwidth) 542 llwidth = W_ADDR + W_LL - addrwidth; 543 ifname = if_indextoname(sdl->sdl_index, ifix_buf); 544 if (!ifname) 545 ifname = "?"; 546 ifwidth = strlen(ifname); 547 if (W_ADDR + W_LL + W_IF - addrwidth - llwidth > ifwidth) 548 ifwidth = W_ADDR + W_LL + W_IF - addrwidth - llwidth; 549 550 printf("%-*.*s %-*.*s %*.*s", addrwidth, addrwidth, host, 551 llwidth, llwidth, ether_str(sdl), ifwidth, ifwidth, ifname); 552 553 if (rtm->rtm_flags & (RTF_PERMANENT_ARP|RTF_LOCAL)) 554 printf(" %-9.9s", "permanent"); 555 else if (rtm->rtm_rmx.rmx_expire == 0) 556 printf(" %-9.9s", "static"); 557 else if (rtm->rtm_rmx.rmx_expire > now) 558 printf(" %-9.9s", 559 sec2str(rtm->rtm_rmx.rmx_expire - now)); 560 else 561 printf(" %-9.9s", "expired"); 562 563 printf(" %s%s\n", 564 (rtm->rtm_flags & RTF_LOCAL) ? "l" : "", 565 (rtm->rtm_flags & RTF_ANNOUNCE) ? "p" : ""); 566 } 567 568 /* 569 * Nuke an arp entry 570 */ 571 void 572 nuke_entry(struct sockaddr_dl *sdl, struct sockaddr_inarp *sin, 573 struct rt_msghdr *rtm) 574 { 575 char ip[20]; 576 577 strlcpy(ip, inet_ntoa(sin->sin_addr), sizeof(ip)); 578 delete(ip); 579 } 580 581 static char * 582 ether_str(struct sockaddr_dl *sdl) 583 { 584 static char hbuf[NI_MAXHOST]; 585 u_char *cp; 586 587 if (sdl->sdl_alen) { 588 cp = (u_char *)LLADDR(sdl); 589 snprintf(hbuf, sizeof(hbuf), "%02x:%02x:%02x:%02x:%02x:%02x", 590 cp[0], cp[1], cp[2], cp[3], cp[4], cp[5]); 591 } else 592 snprintf(hbuf, sizeof(hbuf), "(incomplete)"); 593 594 return(hbuf); 595 } 596 597 void 598 usage(void) 599 { 600 fprintf(stderr, "usage: arp [-adn] [-V rdomain] hostname\n"); 601 fprintf(stderr, " arp [-F] [-f file] [-V rdomain] " 602 "-s hostname ether_addr\n" 603 " [temp | permanent] [pub]\n"); 604 fprintf(stderr, " arp -W ether_addr [iface]\n"); 605 exit(1); 606 } 607 608 int 609 rtmsg(int cmd) 610 { 611 static int seq; 612 struct rt_msghdr *rtm; 613 char *cp; 614 int l; 615 616 rtm = &m_rtmsg.m_rtm; 617 cp = m_rtmsg.m_space; 618 errno = 0; 619 620 if (cmd == RTM_DELETE) 621 goto doit; 622 memset(&m_rtmsg, 0, sizeof(m_rtmsg)); 623 rtm->rtm_flags = flags; 624 rtm->rtm_version = RTM_VERSION; 625 rtm->rtm_hdrlen = sizeof(*rtm); 626 rtm->rtm_tableid = rdomain; 627 628 switch (cmd) { 629 default: 630 errx(1, "internal wrong cmd"); 631 /*NOTREACHED*/ 632 case RTM_ADD: 633 rtm->rtm_addrs |= RTA_GATEWAY; 634 rtm->rtm_rmx.rmx_expire = expire_time; 635 rtm->rtm_inits = RTV_EXPIRE; 636 rtm->rtm_flags |= (RTF_HOST | RTF_STATIC); 637 sin_m.sin_other = 0; 638 if (doing_proxy) { 639 if (export_only) 640 sin_m.sin_other = SIN_PROXY; 641 else { 642 rtm->rtm_addrs |= RTA_NETMASK; 643 rtm->rtm_flags &= ~RTF_HOST; 644 } 645 } 646 /* FALLTHROUGH */ 647 case RTM_GET: 648 rtm->rtm_addrs |= (RTA_DST | RTA_IFP); 649 } 650 651 #define NEXTADDR(w, s) \ 652 if (rtm->rtm_addrs & (w)) { \ 653 memcpy(cp, &s, sizeof(s)); \ 654 cp += ROUNDUP(sizeof(s)); \ 655 } 656 657 NEXTADDR(RTA_DST, sin_m); 658 NEXTADDR(RTA_GATEWAY, sdl_m); 659 NEXTADDR(RTA_NETMASK, so_mask); 660 NEXTADDR(RTA_IFP, ifp_m); 661 662 rtm->rtm_msglen = cp - (char *)&m_rtmsg; 663 doit: 664 l = rtm->rtm_msglen; 665 rtm->rtm_seq = ++seq; 666 rtm->rtm_type = cmd; 667 if (write(rtsock, (char *)&m_rtmsg, l) < 0) 668 if (errno != ESRCH || cmd != RTM_DELETE) { 669 warn("writing to routing socket"); 670 return (-1); 671 } 672 673 do { 674 l = read(rtsock, (char *)&m_rtmsg, sizeof(m_rtmsg)); 675 } while (l > 0 && (rtm->rtm_version != RTM_VERSION || 676 rtm->rtm_seq != seq || rtm->rtm_pid != pid)); 677 678 if (l < 0) 679 warn("read from routing socket"); 680 return (0); 681 } 682 683 int 684 rtget(struct sockaddr_inarp **sinp, struct sockaddr_dl **sdlp) 685 { 686 struct rt_msghdr *rtm = &(m_rtmsg.m_rtm); 687 struct sockaddr_inarp *sin = NULL; 688 struct sockaddr_dl *sdl = NULL; 689 struct sockaddr *sa; 690 char *cp; 691 unsigned int i; 692 693 if (rtmsg(RTM_GET) < 0) 694 return (1); 695 696 if (rtm->rtm_addrs) { 697 cp = ((char *)rtm + rtm->rtm_hdrlen); 698 for (i = 1; i; i <<= 1) { 699 if (i & rtm->rtm_addrs) { 700 sa = (struct sockaddr *)cp; 701 switch (i) { 702 case RTA_DST: 703 sin = (struct sockaddr_inarp *)sa; 704 break; 705 case RTA_IFP: 706 sdl = (struct sockaddr_dl *)sa; 707 break; 708 default: 709 break; 710 } 711 cp += ROUNDUP(sa->sa_len); 712 } 713 } 714 } 715 716 if (sin == NULL || sdl == NULL) 717 return (1); 718 719 *sinp = sin; 720 *sdlp = sdl; 721 722 return (0); 723 } 724 725 int 726 getinetaddr(const char *host, struct in_addr *inap) 727 { 728 struct hostent *hp; 729 730 if (inet_aton(host, inap) == 1) 731 return (0); 732 if ((hp = gethostbyname(host)) == NULL) { 733 warnx("%s: %s", host, hstrerror(h_errno)); 734 return (-1); 735 } 736 memcpy(inap, hp->h_addr, sizeof(*inap)); 737 return (0); 738 } 739 740 static char * 741 sec2str(time_t total) 742 { 743 static char result[256]; 744 int days, hours, mins, secs; 745 int first = 1; 746 char *p = result; 747 char *ep = &result[sizeof(result)]; 748 int n; 749 750 days = total / 3600 / 24; 751 hours = (total / 3600) % 24; 752 mins = (total / 60) % 60; 753 secs = total % 60; 754 755 if (days) { 756 first = 0; 757 n = snprintf(p, ep - p, "%dd", days); 758 if (n < 0 || n >= ep - p) 759 return "?"; 760 p += n; 761 } 762 if (!first || hours) { 763 first = 0; 764 n = snprintf(p, ep - p, "%dh", hours); 765 if (n < 0 || n >= ep - p) 766 return "?"; 767 p += n; 768 } 769 if (!first || mins) { 770 first = 0; 771 n = snprintf(p, ep - p, "%dm", mins); 772 if (n < 0 || n >= ep - p) 773 return "?"; 774 p += n; 775 } 776 snprintf(p, ep - p, "%ds", secs); 777 778 return(result); 779 } 780 781 /* 782 * Copyright (c) 2011 Jasper Lievisse Adriaanse <jasper@openbsd.org> 783 * Copyright (C) 2006,2007,2008,2009 Marc Balmer <mbalmer@openbsd.org> 784 * Copyright (C) 2000 Eugene M. Kim. All rights reserved. 785 * 786 * Redistribution and use in source and binary forms, with or without 787 * modification, are permitted provided that the following conditions 788 * are met: 789 * 790 * 1. Redistributions of source code must retain the above copyright 791 * notice, this list of conditions and the following disclaimer. 792 * 2. Author's name may not be used endorse or promote products derived 793 * from this software without specific prior written permission. 794 * 795 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 796 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 797 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 798 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 799 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 800 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 801 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 802 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 803 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 804 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 805 * POSSIBILITY OF SUCH DAMAGE. 806 */ 807 808 int do_wakeup(const char *, const char *, int); 809 int bind_if_to_bpf(const char *, int); 810 int get_ether(const char *, struct ether_addr *); 811 int send_frame(int, const struct ether_addr *); 812 813 int 814 wake(const char *ether_addr, const char *iface) 815 { 816 struct ifaddrs *ifa, *ifap; 817 char *pname = NULL; 818 int bpf; 819 820 if ((bpf = open("/dev/bpf", O_RDWR)) == -1) 821 err(1, "Failed to bind to bpf"); 822 823 if (iface == NULL) { 824 if (getifaddrs(&ifa) == -1) 825 errx(1, "Could not get interface addresses."); 826 827 for (ifap = ifa; ifap != NULL; ifap = ifap->ifa_next){ 828 if (pname && !strcmp(pname, ifap->ifa_name)) 829 continue; 830 pname = ifap->ifa_name; 831 832 /* 833 * We're only interested in sending the WoL frame on 834 * certain interfaces. So skip the loopback interface, 835 * as well as point-to-point and down interfaces. 836 */ 837 if ((ifap->ifa_flags & IFF_LOOPBACK) || 838 (ifap->ifa_flags & IFF_POINTOPOINT) || 839 (!(ifap->ifa_flags & IFF_UP)) || 840 (!(ifap->ifa_flags & IFF_BROADCAST))) 841 continue; 842 843 do_wakeup(ether_addr, ifap->ifa_name, bpf); 844 } 845 freeifaddrs(ifa); 846 } else { 847 do_wakeup(ether_addr, iface, bpf); 848 } 849 850 (void)close(bpf); 851 852 return 0; 853 } 854 855 int 856 do_wakeup(const char *eaddr, const char *iface, int bpf) 857 { 858 struct ether_addr macaddr; 859 860 if (get_ether(eaddr, &macaddr) != 0) 861 errx(1, "Invalid Ethernet address: %s", eaddr); 862 if (bind_if_to_bpf(iface, bpf) != 0) 863 errx(1, "Failed to bind %s to bpf.", iface); 864 if (send_frame(bpf, &macaddr) != 0) 865 errx(1, "Failed to send WoL frame on %s", iface); 866 return 0; 867 } 868 869 int 870 bind_if_to_bpf(const char *ifname, int bpf) 871 { 872 struct ifreq ifr; 873 u_int dlt; 874 875 if (strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)) >= 876 sizeof(ifr.ifr_name)) 877 return -1; 878 if (ioctl(bpf, BIOCSETIF, &ifr) == -1) 879 return -1; 880 if (ioctl(bpf, BIOCGDLT, &dlt) == -1) 881 return -1; 882 if (dlt != DLT_EN10MB) 883 return -1; 884 return 0; 885 } 886 887 int 888 get_ether(const char *text, struct ether_addr *addr) 889 { 890 struct ether_addr *eaddr; 891 892 eaddr = ether_aton(text); 893 894 if (eaddr == NULL) { 895 if (ether_hostton(text, addr)) 896 return -1; 897 } else { 898 *addr = *eaddr; 899 return 0; 900 } 901 902 return 0; 903 } 904 905 #define SYNC_LEN 6 906 #define DESTADDR_COUNT 16 907 908 int 909 send_frame(int bpf, const struct ether_addr *addr) 910 { 911 struct { 912 struct ether_header hdr; 913 u_char sync[SYNC_LEN]; 914 u_char dest[ETHER_ADDR_LEN * DESTADDR_COUNT]; 915 } __packed pkt; 916 u_char *p; 917 int i; 918 919 (void)memset(&pkt, 0, sizeof(pkt)); 920 (void)memset(&pkt.hdr.ether_dhost, 0xff, sizeof(pkt.hdr.ether_dhost)); 921 pkt.hdr.ether_type = htons(0); 922 (void)memset(pkt.sync, 0xff, SYNC_LEN); 923 for (p = pkt.dest, i = 0; i < DESTADDR_COUNT; p += ETHER_ADDR_LEN, i++) 924 bcopy(addr->ether_addr_octet, p, ETHER_ADDR_LEN); 925 if (write(bpf, &pkt, sizeof(pkt)) != sizeof(pkt)) 926 return (errno); 927 return (0); 928 } 929