11553Srgrimes/* 21553Srgrimes * Copyright (c) 1984, 1993 31553Srgrimes * The Regents of the University of California. All rights reserved. 41553Srgrimes * 51553Srgrimes * This code is derived from software contributed to Berkeley by 61553Srgrimes * Sun Microsystems, Inc. 71553Srgrimes * 81553Srgrimes * Redistribution and use in source and binary forms, with or without 91553Srgrimes * modification, are permitted provided that the following conditions 101553Srgrimes * are met: 111553Srgrimes * 1. Redistributions of source code must retain the above copyright 121553Srgrimes * notice, this list of conditions and the following disclaimer. 131553Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141553Srgrimes * notice, this list of conditions and the following disclaimer in the 151553Srgrimes * documentation and/or other materials provided with the distribution. 161553Srgrimes * 4. Neither the name of the University nor the names of its contributors 171553Srgrimes * may be used to endorse or promote products derived from this software 181553Srgrimes * without specific prior written permission. 191553Srgrimes * 201553Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 211553Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 221553Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 231553Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 241553Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 251553Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 261553Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 271553Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 281553Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 291553Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 301553Srgrimes * SUCH DAMAGE. 311553Srgrimes */ 321553Srgrimes 33114601Sobrien#if 0 341553Srgrimes#ifndef lint 3513977Sphkstatic char const copyright[] = 361553Srgrimes"@(#) Copyright (c) 1984, 1993\n\ 371553Srgrimes The Regents of the University of California. All rights reserved.\n"; 381553Srgrimes#endif /* not lint */ 391553Srgrimes 401553Srgrimes#ifndef lint 4113977Sphkstatic char const sccsid[] = "@(#)from: arp.c 8.2 (Berkeley) 1/2/94"; 42114601Sobrien#endif /* not lint */ 4329060Scharnier#endif 44114601Sobrien#include <sys/cdefs.h> 45114601Sobrien__FBSDID("$FreeBSD$"); 461553Srgrimes 471553Srgrimes/* 481553Srgrimes * arp - display, set, and delete arp table entries 491553Srgrimes */ 501553Srgrimes 511553Srgrimes 521553Srgrimes#include <sys/param.h> 531553Srgrimes#include <sys/file.h> 541553Srgrimes#include <sys/socket.h> 5513977Sphk#include <sys/sockio.h> 561553Srgrimes#include <sys/sysctl.h> 5713977Sphk#include <sys/ioctl.h> 5820287Swollman#include <sys/time.h> 591553Srgrimes 601553Srgrimes#include <net/if.h> 611553Srgrimes#include <net/if_dl.h> 621553Srgrimes#include <net/if_types.h> 6396235Swpaul#include <net/route.h> 6496202Skbyanc#include <net/iso88025.h> 651553Srgrimes 661553Srgrimes#include <netinet/in.h> 671553Srgrimes#include <netinet/if_ether.h> 681553Srgrimes 691553Srgrimes#include <arpa/inet.h> 701553Srgrimes 71108314Sru#include <ctype.h> 7229060Scharnier#include <err.h> 7329060Scharnier#include <errno.h> 741553Srgrimes#include <netdb.h> 751553Srgrimes#include <nlist.h> 7629060Scharnier#include <paths.h> 771553Srgrimes#include <stdio.h> 7813977Sphk#include <stdlib.h> 7993590Smike#include <string.h> 8029060Scharnier#include <strings.h> 8113977Sphk#include <unistd.h> 821553Srgrimes 83128181Sluigitypedef void (action_fn)(struct sockaddr_dl *sdl, 84246143Sglebius struct sockaddr_in *s_in, struct rt_msghdr *rtm); 8513977Sphk 86128181Sluigistatic int search(u_long addr, action_fn *action); 87128181Sluigistatic action_fn print_entry; 88128181Sluigistatic action_fn nuke_entry; 89128181Sluigi 90246143Sglebiusstatic int delete(char *host); 91128181Sluigistatic void usage(void); 92128181Sluigistatic int set(int argc, char **argv); 93147172Srustatic int get(char *host); 94128181Sluigistatic int file(char *name); 95128192Sluigistatic struct rt_msghdr *rtmsg(int cmd, 96246143Sglebius struct sockaddr_in *dst, struct sockaddr_dl *sdl); 97147172Srustatic int get_ether_addr(in_addr_t ipaddr, struct ether_addr *hwaddr); 98246143Sglebiusstatic struct sockaddr_in *getaddr(char *host); 99147172Srustatic int valid_type(int type); 100128181Sluigi 10131145Sjulianstatic int nflag; /* no reverse dns lookups */ 102117729Syarstatic char *rifname; 1031553Srgrimes 104203919Srustatic time_t expire_time; 105246143Sglebiusstatic int flags, doing_proxy; 106128192Sluigi 10731145Sjulian/* which function we're supposed to do */ 10831145Sjulian#define F_GET 1 10931145Sjulian#define F_SET 2 11031145Sjulian#define F_FILESET 3 11131145Sjulian#define F_REPLACE 4 11231145Sjulian#define F_DELETE 5 11331145Sjulian 11431145Sjulian#define SETFUNC(f) { if (func) usage(); func = (f); } 11531145Sjulian 11613977Sphkint 11777870Srumain(int argc, char *argv[]) 1181553Srgrimes{ 11931145Sjulian int ch, func = 0; 12031145Sjulian int rtn = 0; 121128181Sluigi int aflag = 0; /* do it for all entries */ 1221553Srgrimes 123117729Syar while ((ch = getopt(argc, argv, "andfsSi:")) != -1) 124196216Sremko switch(ch) { 1251553Srgrimes case 'a': 12631145Sjulian aflag = 1; 12731145Sjulian break; 1281553Srgrimes case 'd': 12931145Sjulian SETFUNC(F_DELETE); 13031145Sjulian break; 1311553Srgrimes case 'n': 1321553Srgrimes nflag = 1; 13331145Sjulian break; 13413977Sphk case 'S': 13531145Sjulian SETFUNC(F_REPLACE); 13631145Sjulian break; 1371553Srgrimes case 's': 13831145Sjulian SETFUNC(F_SET); 13931145Sjulian break; 1409874Sjkh case 'f' : 14131145Sjulian SETFUNC(F_FILESET); 14231145Sjulian break; 143117729Syar case 'i': 144117729Syar rifname = optarg; 145117729Syar break; 1461553Srgrimes case '?': 1471553Srgrimes default: 1481553Srgrimes usage(); 1491553Srgrimes } 15031145Sjulian argc -= optind; 15131145Sjulian argv += optind; 15231145Sjulian 15331145Sjulian if (!func) 15431145Sjulian func = F_GET; 155117729Syar if (rifname) { 156154162Sbrooks if (func != F_GET && !(func == F_DELETE && aflag)) 157117729Syar errx(1, "-i not applicable to this operation"); 158117729Syar if (if_nametoindex(rifname) == 0) { 159117729Syar if (errno == ENXIO) 160117729Syar errx(1, "interface %s does not exist", rifname); 161117729Syar else 162117729Syar err(1, "if_nametoindex(%s)", rifname); 163117729Syar } 164117729Syar } 16531145Sjulian switch (func) { 16631145Sjulian case F_GET: 16731145Sjulian if (aflag) { 16831145Sjulian if (argc != 0) 16931145Sjulian usage(); 17031145Sjulian search(0, print_entry); 17131145Sjulian } else { 17231145Sjulian if (argc != 1) 17331145Sjulian usage(); 174147172Sru rtn = get(argv[0]); 17531145Sjulian } 17631145Sjulian break; 17731145Sjulian case F_SET: 17831145Sjulian case F_REPLACE: 17977870Sru if (argc < 2 || argc > 6) 18031145Sjulian usage(); 18131145Sjulian if (func == F_REPLACE) 182246143Sglebius (void)delete(argv[0]); 18331145Sjulian rtn = set(argc, argv) ? 1 : 0; 18431145Sjulian break; 18531145Sjulian case F_DELETE: 18631145Sjulian if (aflag) { 18731145Sjulian if (argc != 0) 18831145Sjulian usage(); 18931145Sjulian search(0, nuke_entry); 190255821Sglebius } else { 191255821Sglebius if (argc != 1) 192255821Sglebius usage(); 193246143Sglebius rtn = delete(argv[0]); 194255821Sglebius } 19531145Sjulian break; 19631145Sjulian case F_FILESET: 19731145Sjulian if (argc != 1) 19831145Sjulian usage(); 19931145Sjulian rtn = file(argv[0]); 20031145Sjulian break; 20131145Sjulian } 20231145Sjulian 203147172Sru return (rtn); 2041553Srgrimes} 2051553Srgrimes 2061553Srgrimes/* 2071553Srgrimes * Process a file to set standard arp entries 2081553Srgrimes */ 209128181Sluigistatic int 21013977Sphkfile(char *name) 2111553Srgrimes{ 2121553Srgrimes FILE *fp; 2131553Srgrimes int i, retval; 214109413Sru char line[100], arg[5][50], *args[5], *p; 2151553Srgrimes 21629060Scharnier if ((fp = fopen(name, "r")) == NULL) 217128054Smux err(1, "cannot open %s", name); 2181553Srgrimes args[0] = &arg[0][0]; 2191553Srgrimes args[1] = &arg[1][0]; 2201553Srgrimes args[2] = &arg[2][0]; 2211553Srgrimes args[3] = &arg[3][0]; 2221553Srgrimes args[4] = &arg[4][0]; 2231553Srgrimes retval = 0; 224167260Skevlo while(fgets(line, sizeof(line), fp) != NULL) { 225109413Sru if ((p = strchr(line, '#')) != NULL) 226109413Sru *p = '\0'; 227109413Sru for (p = line; isblank(*p); p++); 228111910Sru if (*p == '\n' || *p == '\0') 229108314Sru continue; 230109413Sru i = sscanf(p, "%49s %49s %49s %49s %49s", arg[0], arg[1], 23156134Sjkh arg[2], arg[3], arg[4]); 2321553Srgrimes if (i < 2) { 23329060Scharnier warnx("bad line: %s", line); 2341553Srgrimes retval = 1; 2351553Srgrimes continue; 2361553Srgrimes } 2371553Srgrimes if (set(i, args)) 2381553Srgrimes retval = 1; 2391553Srgrimes } 2401553Srgrimes fclose(fp); 2411553Srgrimes return (retval); 2421553Srgrimes} 2431553Srgrimes 2441553Srgrimes/* 245246143Sglebius * Given a hostname, fills up a (static) struct sockaddr_in with 246128192Sluigi * the address of the host and returns a pointer to the 247128192Sluigi * structure. 248128192Sluigi */ 249246143Sglebiusstatic struct sockaddr_in * 250128192Sluigigetaddr(char *host) 251128192Sluigi{ 252128192Sluigi struct hostent *hp; 253246143Sglebius static struct sockaddr_in reply; 254128192Sluigi 255128192Sluigi bzero(&reply, sizeof(reply)); 256128192Sluigi reply.sin_len = sizeof(reply); 257128192Sluigi reply.sin_family = AF_INET; 258128192Sluigi reply.sin_addr.s_addr = inet_addr(host); 259128192Sluigi if (reply.sin_addr.s_addr == INADDR_NONE) { 260128192Sluigi if (!(hp = gethostbyname(host))) { 261128192Sluigi warnx("%s: %s", host, hstrerror(h_errno)); 262147172Sru return (NULL); 263128192Sluigi } 264128192Sluigi bcopy((char *)hp->h_addr, (char *)&reply.sin_addr, 265128192Sluigi sizeof reply.sin_addr); 266128192Sluigi } 267147172Sru return (&reply); 268128192Sluigi} 269128192Sluigi 270128192Sluigi/* 271147172Sru * Returns true if the type is a valid one for ARP. 272128192Sluigi */ 273128192Sluigistatic int 274128192Sluigivalid_type(int type) 275128192Sluigi{ 276147172Sru 277128192Sluigi switch (type) { 278128192Sluigi case IFT_ETHER: 279128192Sluigi case IFT_FDDI: 280128192Sluigi case IFT_ISO88023: 281128192Sluigi case IFT_ISO88024: 282128192Sluigi case IFT_ISO88025: 283128192Sluigi case IFT_L2VLAN: 284151989Sthompsa case IFT_BRIDGE: 285147172Sru return (1); 286147172Sru default: 287147172Sru return (0); 288128192Sluigi } 289128192Sluigi} 290128192Sluigi 291128192Sluigi/* 2928857Srgrimes * Set an individual arp entry 2931553Srgrimes */ 294128192Sluigistatic int 29513977Sphkset(int argc, char **argv) 2961553Srgrimes{ 297246143Sglebius struct sockaddr_in *addr; 298246143Sglebius struct sockaddr_in *dst; /* what are we looking for */ 299128054Smux struct sockaddr_dl *sdl; 300128181Sluigi struct rt_msghdr *rtm; 30193952Sru struct ether_addr *ea; 3021553Srgrimes char *host = argv[0], *eaddr = argv[1]; 303147172Sru struct sockaddr_dl sdl_m; 3041553Srgrimes 3051553Srgrimes argc -= 2; 3061553Srgrimes argv += 2; 307128181Sluigi 308128181Sluigi bzero(&sdl_m, sizeof(sdl_m)); 309128181Sluigi sdl_m.sdl_len = sizeof(sdl_m); 310128181Sluigi sdl_m.sdl_family = AF_LINK; 311128181Sluigi 312128192Sluigi dst = getaddr(host); 313128192Sluigi if (dst == NULL) 314128192Sluigi return (1); 315246143Sglebius doing_proxy = flags = expire_time = 0; 3161553Srgrimes while (argc-- > 0) { 3171553Srgrimes if (strncmp(argv[0], "temp", 4) == 0) { 318216076Sglebius struct timespec tp; 319216078Sglebius int max_age; 320216078Sglebius size_t len = sizeof(max_age); 321216078Sglebius 322216076Sglebius clock_gettime(CLOCK_MONOTONIC, &tp); 323216078Sglebius if (sysctlbyname("net.link.ether.inet.max_age", 324216078Sglebius &max_age, &len, NULL, 0) != 0) 325216078Sglebius err(1, "sysctlbyname"); 326216078Sglebius expire_time = tp.tv_sec + max_age; 327177362Ssam } else if (strncmp(argv[0], "pub", 3) == 0) { 3281553Srgrimes flags |= RTF_ANNOUNCE; 32977870Sru doing_proxy = 1; 33077870Sru if (argc && strncmp(argv[1], "only", 3) == 0) { 331246143Sglebius /* 332246143Sglebius * Compatibility: in pre FreeBSD 8 times 333246143Sglebius * the "only" keyword used to mean that 334246143Sglebius * an ARP entry should be announced, but 335246143Sglebius * not installed into routing table. 336246143Sglebius */ 33777870Sru argc--; argv++; 33877870Sru } 339177362Ssam } else if (strncmp(argv[0], "blackhole", 9) == 0) { 340186485Strhodes if (flags & RTF_REJECT) { 341186485Strhodes printf("Choose one of blackhole or reject, not both.\n"); 342186485Strhodes } 343177362Ssam flags |= RTF_BLACKHOLE; 344177362Ssam } else if (strncmp(argv[0], "reject", 6) == 0) { 345186485Strhodes if (flags & RTF_BLACKHOLE) { 346186485Strhodes printf("Choose one of blackhole or reject, not both.\n"); 347186485Strhodes } 348177362Ssam flags |= RTF_REJECT; 3491553Srgrimes } else if (strncmp(argv[0], "trail", 5) == 0) { 350128192Sluigi /* XXX deprecated and undocumented feature */ 3511553Srgrimes printf("%s: Sending trailers is no longer supported\n", 3521553Srgrimes host); 3531553Srgrimes } 3541553Srgrimes argv++; 3551553Srgrimes } 35693952Sru ea = (struct ether_addr *)LLADDR(&sdl_m); 35713977Sphk if (doing_proxy && !strcmp(eaddr, "auto")) { 358128192Sluigi if (!get_ether_addr(dst->sin_addr.s_addr, ea)) { 35973135Sru printf("no interface found for %s\n", 360128192Sluigi inet_ntoa(dst->sin_addr)); 36113977Sphk return (1); 36213977Sphk } 36393952Sru sdl_m.sdl_alen = ETHER_ADDR_LEN; 36413977Sphk } else { 365128192Sluigi struct ether_addr *ea1 = ether_aton(eaddr); 366128192Sluigi 367155471Sglebius if (ea1 == NULL) { 368128192Sluigi warnx("invalid Ethernet address '%s'", eaddr); 369155471Sglebius return (1); 370155471Sglebius } else { 371128192Sluigi *ea = *ea1; 37293952Sru sdl_m.sdl_alen = ETHER_ADDR_LEN; 373128192Sluigi } 37413977Sphk } 375201282Sqingli 376201282Sqingli /* 377201282Sqingli * In the case a proxy-arp entry is being added for 378201282Sqingli * a remote end point, the RTF_ANNOUNCE flag in the 379201282Sqingli * RTM_GET command is an indication to the kernel 380201282Sqingli * routing code that the interface associated with 381201282Sqingli * the prefix route covering the local end of the 382201282Sqingli * PPP link should be returned, on which ARP applies. 383201282Sqingli */ 384201282Sqingli rtm = rtmsg(RTM_GET, dst, &sdl_m); 385201282Sqingli if (rtm == NULL) { 386201282Sqingli warn("%s", host); 387201282Sqingli return (1); 3881553Srgrimes } 389246143Sglebius addr = (struct sockaddr_in *)(rtm + 1); 390201282Sqingli sdl = (struct sockaddr_dl *)(SA_SIZE(addr) + (char *)addr); 391128192Sluigi 392201282Sqingli if ((sdl->sdl_family != AF_LINK) || 393201282Sqingli (rtm->rtm_flags & RTF_GATEWAY) || 394201282Sqingli !valid_type(sdl->sdl_type)) { 3951553Srgrimes printf("cannot intuit interface index and type for %s\n", host); 3961553Srgrimes return (1); 3971553Srgrimes } 3981553Srgrimes sdl_m.sdl_type = sdl->sdl_type; 3991553Srgrimes sdl_m.sdl_index = sdl->sdl_index; 400147170Sglebius return (rtmsg(RTM_ADD, dst, &sdl_m) == NULL); 4011553Srgrimes} 4021553Srgrimes 4031553Srgrimes/* 4041553Srgrimes * Display an individual arp entry 4051553Srgrimes */ 406147172Srustatic int 40713977Sphkget(char *host) 4081553Srgrimes{ 409246143Sglebius struct sockaddr_in *addr; 4101553Srgrimes 411128192Sluigi addr = getaddr(host); 412128192Sluigi if (addr == NULL) 413147172Sru return (1); 414128181Sluigi if (0 == search(addr->sin_addr.s_addr, print_entry)) { 415117729Syar printf("%s (%s) -- no entry", 41687598Smikeh host, inet_ntoa(addr->sin_addr)); 417117729Syar if (rifname) 418117729Syar printf(" on %s", rifname); 419117729Syar printf("\n"); 420147172Sru return (1); 4211553Srgrimes } 422147172Sru return (0); 4231553Srgrimes} 4241553Srgrimes 4251553Srgrimes/* 4268857Srgrimes * Delete an arp entry 4271553Srgrimes */ 428128181Sluigistatic int 429246143Sglebiusdelete(char *host) 4301553Srgrimes{ 431246143Sglebius struct sockaddr_in *addr, *dst; 432128181Sluigi struct rt_msghdr *rtm; 4331553Srgrimes struct sockaddr_dl *sdl; 434186119Sqingli struct sockaddr_dl sdl_m; 4351553Srgrimes 436128192Sluigi dst = getaddr(host); 437128192Sluigi if (dst == NULL) 438147172Sru return (1); 439186119Sqingli 440186119Sqingli /* 441201282Sqingli * Perform a regular entry delete first. 442201282Sqingli */ 443201282Sqingli flags &= ~RTF_ANNOUNCE; 444201282Sqingli 445201282Sqingli /* 446186119Sqingli * setup the data structure to notify the kernel 447186119Sqingli * it is the ARP entry the RTM_GET is interested 448186119Sqingli * in 449186119Sqingli */ 450186119Sqingli bzero(&sdl_m, sizeof(sdl_m)); 451186119Sqingli sdl_m.sdl_len = sizeof(sdl_m); 452186119Sqingli sdl_m.sdl_family = AF_LINK; 453186119Sqingli 454128192Sluigi for (;;) { /* try twice */ 455186119Sqingli rtm = rtmsg(RTM_GET, dst, &sdl_m); 456128192Sluigi if (rtm == NULL) { 457128192Sluigi warn("%s", host); 4581553Srgrimes return (1); 4591553Srgrimes } 460246143Sglebius addr = (struct sockaddr_in *)(rtm + 1); 461128192Sluigi sdl = (struct sockaddr_dl *)(SA_SIZE(addr) + (char *)addr); 462186119Sqingli 463186119Sqingli /* 464186119Sqingli * With the new L2/L3 restructure, the route 465186119Sqingli * returned is a prefix route. The important 466186119Sqingli * piece of information from the previous 467186119Sqingli * RTM_GET is the interface index. In the 468186119Sqingli * case of ECMP, the kernel will traverse 469186119Sqingli * the route group for the given entry. 470186119Sqingli */ 471186119Sqingli if (sdl->sdl_family == AF_LINK && 472128192Sluigi !(rtm->rtm_flags & RTF_GATEWAY) && 473186119Sqingli valid_type(sdl->sdl_type) ) { 474186119Sqingli addr->sin_addr.s_addr = dst->sin_addr.s_addr; 475186119Sqingli break; 476186119Sqingli } 477186119Sqingli 478201282Sqingli /* 479201282Sqingli * Regualar entry delete failed, now check if there 480201282Sqingli * is a proxy-arp entry to remove. 481201282Sqingli */ 482201282Sqingli if (flags & RTF_ANNOUNCE) { 483128192Sluigi fprintf(stderr, "delete: cannot locate %s\n",host); 484128192Sluigi return (1); 485128192Sluigi } 486201282Sqingli 487201282Sqingli flags |= RTF_ANNOUNCE; 4881553Srgrimes } 489186500Sqingli rtm->rtm_flags |= RTF_LLDATA; 490128192Sluigi if (rtmsg(RTM_DELETE, dst, NULL) != NULL) { 49187598Smikeh printf("%s (%s) deleted\n", host, inet_ntoa(addr->sin_addr)); 49213977Sphk return (0); 49313977Sphk } 49413977Sphk return (1); 4951553Srgrimes} 4961553Srgrimes 497201282Sqingli 4981553Srgrimes/* 49931145Sjulian * Search the arp table and do some action on matching entries 5001553Srgrimes */ 501128181Sluigistatic int 502128181Sluigisearch(u_long addr, action_fn *action) 5031553Srgrimes{ 5041553Srgrimes int mib[6]; 5051553Srgrimes size_t needed; 506201202Sjhb char *lim, *buf, *next; 5071553Srgrimes struct rt_msghdr *rtm; 508246143Sglebius struct sockaddr_in *sin2; 5091553Srgrimes struct sockaddr_dl *sdl; 510117729Syar char ifname[IF_NAMESIZE]; 511140735Smaxim int st, found_entry = 0; 5121553Srgrimes 5131553Srgrimes mib[0] = CTL_NET; 5141553Srgrimes mib[1] = PF_ROUTE; 5151553Srgrimes mib[2] = 0; 5161553Srgrimes mib[3] = AF_INET; 5171553Srgrimes mib[4] = NET_RT_FLAGS; 518186119Sqingli#ifdef RTF_LLINFO 5191553Srgrimes mib[5] = RTF_LLINFO; 520186119Sqingli#else 521186119Sqingli mib[5] = 0; 522186119Sqingli#endif 5231553Srgrimes if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) 524128054Smux err(1, "route-sysctl-estimate"); 525128192Sluigi if (needed == 0) /* empty table */ 526128181Sluigi return 0; 527140735Smaxim buf = NULL; 528140748Smaxim for (;;) { 529201202Sjhb buf = reallocf(buf, needed); 530201202Sjhb if (buf == NULL) 531140735Smaxim errx(1, "could not reallocate memory"); 532140735Smaxim st = sysctl(mib, 6, buf, &needed, NULL, 0); 533140748Smaxim if (st == 0 || errno != ENOMEM) 534140748Smaxim break; 535140748Smaxim needed += needed / 8; 536140748Smaxim } 537140735Smaxim if (st == -1) 538128054Smux err(1, "actual retrieval of routing table"); 5391553Srgrimes lim = buf + needed; 5401553Srgrimes for (next = buf; next < lim; next += rtm->rtm_msglen) { 5411553Srgrimes rtm = (struct rt_msghdr *)next; 542246143Sglebius sin2 = (struct sockaddr_in *)(rtm + 1); 543130246Sstefanf sdl = (struct sockaddr_dl *)((char *)sin2 + SA_SIZE(sin2)); 544117729Syar if (rifname && if_indextoname(sdl->sdl_index, ifname) && 545117729Syar strcmp(ifname, rifname)) 546117729Syar continue; 5471553Srgrimes if (addr) { 54887598Smikeh if (addr != sin2->sin_addr.s_addr) 5491553Srgrimes continue; 5501553Srgrimes found_entry = 1; 5511553Srgrimes } 55287598Smikeh (*action)(sdl, sin2, rtm); 5531553Srgrimes } 55476216Syar free(buf); 555147172Sru return (found_entry); 5561553Srgrimes} 5571553Srgrimes 55831145Sjulian/* 55931145Sjulian * Display an arp entry 56031145Sjulian */ 561209063Smlaierstatic char lifname[IF_NAMESIZE]; 562209063Smlaierstatic int64_t lifindex = -1; 563209063Smlaier 564128181Sluigistatic void 56531145Sjulianprint_entry(struct sockaddr_dl *sdl, 566246143Sglebius struct sockaddr_in *addr, struct rt_msghdr *rtm) 56731145Sjulian{ 56877870Sru const char *host; 56931145Sjulian struct hostent *hp; 57096202Skbyanc struct iso88025_sockaddr_dl_data *trld; 57144627Sjulian int seg; 57231145Sjulian 57331145Sjulian if (nflag == 0) 57487598Smikeh hp = gethostbyaddr((caddr_t)&(addr->sin_addr), 57587598Smikeh sizeof addr->sin_addr, AF_INET); 57631145Sjulian else 57731145Sjulian hp = 0; 57831145Sjulian if (hp) 57931145Sjulian host = hp->h_name; 58031145Sjulian else { 58131145Sjulian host = "?"; 58231145Sjulian if (h_errno == TRY_AGAIN) 58331145Sjulian nflag = 1; 58431145Sjulian } 58587598Smikeh printf("%s (%s) at ", host, inet_ntoa(addr->sin_addr)); 586130408Sdfr if (sdl->sdl_alen) { 587139270Sru if ((sdl->sdl_type == IFT_ETHER || 588151989Sthompsa sdl->sdl_type == IFT_L2VLAN || 589151989Sthompsa sdl->sdl_type == IFT_BRIDGE) && 590130408Sdfr sdl->sdl_alen == ETHER_ADDR_LEN) 591130408Sdfr printf("%s", ether_ntoa((struct ether_addr *)LLADDR(sdl))); 592130408Sdfr else { 593130408Sdfr int n = sdl->sdl_nlen > 0 ? sdl->sdl_nlen + 1 : 0; 594130408Sdfr 595130408Sdfr printf("%s", link_ntoa(sdl) + n); 596130408Sdfr } 597130408Sdfr } else 59831145Sjulian printf("(incomplete)"); 599209063Smlaier if (sdl->sdl_index != lifindex && 600209063Smlaier if_indextoname(sdl->sdl_index, lifname) != NULL) { 601209063Smlaier lifindex = sdl->sdl_index; 602209063Smlaier printf(" on %s", lifname); 603209063Smlaier } else if (sdl->sdl_index == lifindex) 604209063Smlaier printf(" on %s", lifname); 60531145Sjulian if (rtm->rtm_rmx.rmx_expire == 0) 60631145Sjulian printf(" permanent"); 607203919Sru else { 608216075Sglebius static struct timespec tp; 609216075Sglebius if (tp.tv_sec == 0) 610216075Sglebius clock_gettime(CLOCK_MONOTONIC, &tp); 611216075Sglebius if ((expire_time = rtm->rtm_rmx.rmx_expire - tp.tv_sec) > 0) 612203919Sru printf(" expires in %d seconds", (int)expire_time); 613203919Sru else 614203919Sru printf(" expired"); 615203919Sru } 616186119Sqingli if (rtm->rtm_flags & RTF_ANNOUNCE) 617186119Sqingli printf(" published"); 618186119Sqingli switch(sdl->sdl_type) { 619128181Sluigi case IFT_ETHER: 62044627Sjulian printf(" [ethernet]"); 62144627Sjulian break; 622128181Sluigi case IFT_ISO88025: 62344627Sjulian printf(" [token-ring]"); 62496202Skbyanc trld = SDL_ISO88025(sdl); 62596202Skbyanc if (trld->trld_rcf != 0) { 62696202Skbyanc printf(" rt=%x", ntohs(trld->trld_rcf)); 62796202Skbyanc for (seg = 0; 62896202Skbyanc seg < ((TR_RCF_RIFLEN(trld->trld_rcf) - 2 ) / 2); 62996202Skbyanc seg++) 63096235Swpaul printf(":%x", ntohs(*(trld->trld_route[seg]))); 63196202Skbyanc } 63244627Sjulian break; 633128181Sluigi case IFT_FDDI: 63485123Smdodd printf(" [fddi]"); 63585123Smdodd break; 636128181Sluigi case IFT_ATM: 63785123Smdodd printf(" [atm]"); 63885123Smdodd break; 639128181Sluigi case IFT_L2VLAN: 64075180Syar printf(" [vlan]"); 64175180Syar break; 642130408Sdfr case IFT_IEEE1394: 643130408Sdfr printf(" [firewire]"); 644130408Sdfr break; 645151989Sthompsa case IFT_BRIDGE: 646151989Sthompsa printf(" [bridge]"); 647151989Sthompsa break; 648128181Sluigi default: 64994075Smurray break; 65044627Sjulian } 65144627Sjulian 65231145Sjulian printf("\n"); 65344627Sjulian 65431145Sjulian} 65531145Sjulian 65631145Sjulian/* 65731145Sjulian * Nuke an arp entry 65831145Sjulian */ 659128181Sluigistatic void 66087598Smikehnuke_entry(struct sockaddr_dl *sdl __unused, 661246143Sglebius struct sockaddr_in *addr, struct rt_msghdr *rtm __unused) 66231145Sjulian{ 66331145Sjulian char ip[20]; 66431145Sjulian 66587598Smikeh snprintf(ip, sizeof(ip), "%s", inet_ntoa(addr->sin_addr)); 666246143Sglebius delete(ip); 66731145Sjulian} 66831145Sjulian 669128181Sluigistatic void 67013977Sphkusage(void) 6711553Srgrimes{ 67231145Sjulian fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n", 673117729Syar "usage: arp [-n] [-i interface] hostname", 674117729Syar " arp [-n] [-i interface] -a", 67577870Sru " arp -d hostname [pub]", 676154191Sbrooks " arp -d [-i interface] -a", 677186485Strhodes " arp -s hostname ether_addr [temp] [reject | blackhole] [pub [only]]", 678186485Strhodes " arp -S hostname ether_addr [temp] [reject | blackhole] [pub [only]]", 67929060Scharnier " arp -f filename"); 6801553Srgrimes exit(1); 6811553Srgrimes} 6821553Srgrimes 683128181Sluigistatic struct rt_msghdr * 684246143Sglebiusrtmsg(int cmd, struct sockaddr_in *dst, struct sockaddr_dl *sdl) 6851553Srgrimes{ 6861553Srgrimes static int seq; 6871553Srgrimes int rlen; 688128181Sluigi int l; 689175206Ssam struct sockaddr_in so_mask, *som = &so_mask; 690128181Sluigi static int s = -1; 691128181Sluigi static pid_t pid; 692128181Sluigi 693128181Sluigi static struct { 694128181Sluigi struct rt_msghdr m_rtm; 695128181Sluigi char m_space[512]; 696128181Sluigi } m_rtmsg; 697128181Sluigi 698128054Smux struct rt_msghdr *rtm = &m_rtmsg.m_rtm; 699128054Smux char *cp = m_rtmsg.m_space; 7001553Srgrimes 701128181Sluigi if (s < 0) { /* first time: open socket, get pid */ 702128181Sluigi s = socket(PF_ROUTE, SOCK_RAW, 0); 703128181Sluigi if (s < 0) 704128181Sluigi err(1, "socket"); 705128181Sluigi pid = getpid(); 706128181Sluigi } 707128181Sluigi bzero(&so_mask, sizeof(so_mask)); 708128181Sluigi so_mask.sin_len = 8; 709128181Sluigi so_mask.sin_addr.s_addr = 0xffffffff; 710128181Sluigi 7111553Srgrimes errno = 0; 712128192Sluigi /* 713128192Sluigi * XXX RTM_DELETE relies on a previous RTM_GET to fill the buffer 714128192Sluigi * appropriately. 715128192Sluigi */ 7161553Srgrimes if (cmd == RTM_DELETE) 7171553Srgrimes goto doit; 7181553Srgrimes bzero((char *)&m_rtmsg, sizeof(m_rtmsg)); 7191553Srgrimes rtm->rtm_flags = flags; 7201553Srgrimes rtm->rtm_version = RTM_VERSION; 7211553Srgrimes 7221553Srgrimes switch (cmd) { 7231553Srgrimes default: 72429060Scharnier errx(1, "internal wrong cmd"); 7251553Srgrimes case RTM_ADD: 7261553Srgrimes rtm->rtm_addrs |= RTA_GATEWAY; 7271553Srgrimes rtm->rtm_rmx.rmx_expire = expire_time; 7281553Srgrimes rtm->rtm_inits = RTV_EXPIRE; 729186500Sqingli rtm->rtm_flags |= (RTF_HOST | RTF_STATIC | RTF_LLDATA); 7301553Srgrimes if (doing_proxy) { 731246143Sglebius rtm->rtm_addrs |= RTA_NETMASK; 732246143Sglebius rtm->rtm_flags &= ~RTF_HOST; 7331553Srgrimes } 7341553Srgrimes /* FALLTHROUGH */ 7351553Srgrimes case RTM_GET: 7361553Srgrimes rtm->rtm_addrs |= RTA_DST; 7371553Srgrimes } 738193976Sdes#define NEXTADDR(w, s) \ 739193976Sdes do { \ 740193976Sdes if ((s) != NULL && rtm->rtm_addrs & (w)) { \ 741193976Sdes bcopy((s), cp, sizeof(*(s))); \ 742193976Sdes cp += SA_SIZE(s); \ 743193976Sdes } \ 744193976Sdes } while (0) 7451553Srgrimes 746128192Sluigi NEXTADDR(RTA_DST, dst); 747128192Sluigi NEXTADDR(RTA_GATEWAY, sdl); 748175206Ssam NEXTADDR(RTA_NETMASK, som); 7491553Srgrimes 7501553Srgrimes rtm->rtm_msglen = cp - (char *)&m_rtmsg; 7511553Srgrimesdoit: 7521553Srgrimes l = rtm->rtm_msglen; 7531553Srgrimes rtm->rtm_seq = ++seq; 7541553Srgrimes rtm->rtm_type = cmd; 7551553Srgrimes if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) { 7561553Srgrimes if (errno != ESRCH || cmd != RTM_DELETE) { 75729060Scharnier warn("writing to routing socket"); 758147172Sru return (NULL); 7591553Srgrimes } 7601553Srgrimes } 7611553Srgrimes do { 7621553Srgrimes l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg)); 7631553Srgrimes } while (l > 0 && (rtm->rtm_seq != seq || rtm->rtm_pid != pid)); 7641553Srgrimes if (l < 0) 76529060Scharnier warn("read from routing socket"); 766147172Sru return (rtm); 7671553Srgrimes} 7681553Srgrimes 76913977Sphk/* 77013977Sphk * get_ether_addr - get the hardware address of an interface on the 77113977Sphk * the same subnet as ipaddr. 77213977Sphk */ 77313977Sphk#define MAX_IFS 32 77413977Sphk 775128181Sluigistatic int 776147172Sruget_ether_addr(in_addr_t ipaddr, struct ether_addr *hwaddr) 77713977Sphk{ 77813977Sphk struct ifreq *ifr, *ifend, *ifp; 779147172Sru in_addr_t ina, mask; 78013977Sphk struct sockaddr_dl *dla; 78113977Sphk struct ifreq ifreq; 78213977Sphk struct ifconf ifc; 78313977Sphk struct ifreq ifs[MAX_IFS]; 78487598Smikeh int sock; 785128192Sluigi int retval = 0; 78613977Sphk 78787598Smikeh sock = socket(AF_INET, SOCK_DGRAM, 0); 78887598Smikeh if (sock < 0) 78929060Scharnier err(1, "socket"); 79013977Sphk 79113977Sphk ifc.ifc_len = sizeof(ifs); 79213977Sphk ifc.ifc_req = ifs; 79392735Smikeh if (ioctl(sock, SIOCGIFCONF, &ifc) < 0) { 79429060Scharnier warnx("ioctl(SIOCGIFCONF)"); 795128192Sluigi goto done; 79613977Sphk } 79713977Sphk 798128192Sluigi#define NEXTIFR(i) \ 799128192Sluigi ((struct ifreq *)((char *)&(i)->ifr_addr \ 800128192Sluigi + MAX((i)->ifr_addr.sa_len, sizeof((i)->ifr_addr))) ) 801128192Sluigi 80213977Sphk /* 803128192Sluigi * Scan through looking for an interface with an Internet 804128192Sluigi * address on the same subnet as `ipaddr'. 805128192Sluigi */ 806128192Sluigi ifend = (struct ifreq *)(ifc.ifc_buf + ifc.ifc_len); 807128192Sluigi for (ifr = ifc.ifc_req; ifr < ifend; ifr = NEXTIFR(ifr) ) { 808128192Sluigi if (ifr->ifr_addr.sa_family != AF_INET) 809128192Sluigi continue; 810128192Sluigi strncpy(ifreq.ifr_name, ifr->ifr_name, 811128192Sluigi sizeof(ifreq.ifr_name)); 812163305Sglebius ifreq.ifr_addr = ifr->ifr_addr; 813128192Sluigi /* 814128192Sluigi * Check that the interface is up, 815128192Sluigi * and not point-to-point or loopback. 816128192Sluigi */ 817128192Sluigi if (ioctl(sock, SIOCGIFFLAGS, &ifreq) < 0) 818128192Sluigi continue; 819128192Sluigi if ((ifreq.ifr_flags & 820128192Sluigi (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT| 821128192Sluigi IFF_LOOPBACK|IFF_NOARP)) 822128192Sluigi != (IFF_UP|IFF_BROADCAST)) 823128192Sluigi continue; 824128192Sluigi /* 825128192Sluigi * Get its netmask and check that it's on 826128192Sluigi * the right subnet. 827128192Sluigi */ 828128192Sluigi if (ioctl(sock, SIOCGIFNETMASK, &ifreq) < 0) 829128192Sluigi continue; 830128192Sluigi mask = ((struct sockaddr_in *) 831128192Sluigi &ifreq.ifr_addr)->sin_addr.s_addr; 832128192Sluigi ina = ((struct sockaddr_in *) 833128192Sluigi &ifr->ifr_addr)->sin_addr.s_addr; 834128192Sluigi if ((ipaddr & mask) == (ina & mask)) 835128192Sluigi break; /* ok, we got it! */ 83613977Sphk } 83713977Sphk 838128192Sluigi if (ifr >= ifend) 839128192Sluigi goto done; 84013977Sphk 84113977Sphk /* 842128192Sluigi * Now scan through again looking for a link-level address 843128192Sluigi * for this interface. 844128192Sluigi */ 84513977Sphk ifp = ifr; 846128192Sluigi for (ifr = ifc.ifc_req; ifr < ifend; ifr = NEXTIFR(ifr)) 847128192Sluigi if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0 && 848128192Sluigi ifr->ifr_addr.sa_family == AF_LINK) 849128192Sluigi break; 850128192Sluigi if (ifr >= ifend) 851128192Sluigi goto done; 852128192Sluigi /* 853128192Sluigi * Found the link-level address - copy it out 854128192Sluigi */ 855128192Sluigi dla = (struct sockaddr_dl *) &ifr->ifr_addr; 856128192Sluigi memcpy(hwaddr, LLADDR(dla), dla->sdl_alen); 857128192Sluigi printf("using interface %s for proxy with address ", 858128192Sluigi ifp->ifr_name); 859128192Sluigi printf("%s\n", ether_ntoa(hwaddr)); 860128192Sluigi retval = dla->sdl_alen; 861128192Sluigidone: 862128192Sluigi close(sock); 863147172Sru return (retval); 86413977Sphk} 865