arp.c revision 73135
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 * 3. All advertising materials mentioning features or use of this software 171553Srgrimes * must display the following acknowledgement: 181553Srgrimes * This product includes software developed by the University of 191553Srgrimes * California, Berkeley and its contributors. 201553Srgrimes * 4. Neither the name of the University nor the names of its contributors 211553Srgrimes * may be used to endorse or promote products derived from this software 221553Srgrimes * without specific prior written permission. 231553Srgrimes * 241553Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 251553Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 261553Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 271553Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 281553Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 291553Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 301553Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 311553Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 321553Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 331553Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 341553Srgrimes * SUCH DAMAGE. 351553Srgrimes */ 361553Srgrimes 371553Srgrimes#ifndef lint 3813977Sphkstatic char const copyright[] = 391553Srgrimes"@(#) Copyright (c) 1984, 1993\n\ 401553Srgrimes The Regents of the University of California. All rights reserved.\n"; 411553Srgrimes#endif /* not lint */ 421553Srgrimes 431553Srgrimes#ifndef lint 4429060Scharnier#if 0 4513977Sphkstatic char const sccsid[] = "@(#)from: arp.c 8.2 (Berkeley) 1/2/94"; 4629060Scharnier#endif 4729060Scharnierstatic const char rcsid[] = 4850479Speter "$FreeBSD: head/usr.sbin/arp/arp.c 73135 2001-02-27 09:02:10Z ru $"; 491553Srgrimes#endif /* not lint */ 501553Srgrimes 511553Srgrimes/* 521553Srgrimes * arp - display, set, and delete arp table entries 531553Srgrimes */ 541553Srgrimes 551553Srgrimes 561553Srgrimes#include <sys/param.h> 571553Srgrimes#include <sys/file.h> 581553Srgrimes#include <sys/socket.h> 5913977Sphk#include <sys/sockio.h> 601553Srgrimes#include <sys/sysctl.h> 6113977Sphk#include <sys/ioctl.h> 6220287Swollman#include <sys/time.h> 631553Srgrimes 641553Srgrimes#include <net/if.h> 651553Srgrimes#include <net/if_dl.h> 661553Srgrimes#include <net/if_types.h> 671553Srgrimes#include <net/route.h> 681553Srgrimes 691553Srgrimes#include <netinet/in.h> 701553Srgrimes#include <netinet/if_ether.h> 711553Srgrimes 721553Srgrimes#include <arpa/inet.h> 731553Srgrimes 7429060Scharnier#include <err.h> 7529060Scharnier#include <errno.h> 761553Srgrimes#include <netdb.h> 771553Srgrimes#include <nlist.h> 7829060Scharnier#include <paths.h> 791553Srgrimes#include <stdio.h> 8013977Sphk#include <stdlib.h> 8129060Scharnier#include <strings.h> 8213977Sphk#include <unistd.h> 831553Srgrimes 8431145Sjulianvoid search(u_long addr, void (*action)(struct sockaddr_dl *sdl, 8531145Sjulian struct sockaddr_inarp *sin, struct rt_msghdr *rtm)); 8631145Sjulianvoid print_entry(struct sockaddr_dl *sdl, 8731145Sjulian struct sockaddr_inarp *sin, struct rt_msghdr *rtm); 8831145Sjulianvoid nuke_entry(struct sockaddr_dl *sdl, 8931145Sjulian struct sockaddr_inarp *sin, struct rt_msghdr *rtm); 9013977Sphkint delete(char *host, char *info); 9113977Sphkvoid ether_print(u_char *cp); 9213977Sphkvoid usage(void); 9313977Sphkint set(int argc, char **argv); 9431145Sjulianint get(char *host); 9513977Sphkint file(char *name); 9613977Sphkvoid getsocket(void); 9720690Snateint my_ether_aton(char *a, u_char *n); 9813977Sphkint rtmsg(int cmd); 9957727Sshinint get_ether_addr(u_int32_t ipaddr, u_char *hwaddr); 10013977Sphk 1011553Srgrimesstatic int pid; 10231145Sjulianstatic int nflag; /* no reverse dns lookups */ 10331145Sjulianstatic int aflag; /* do it for all entries */ 1041553Srgrimesstatic int s = -1; 1051553Srgrimes 10631145Sjulian/* which function we're supposed to do */ 10731145Sjulian#define F_GET 1 10831145Sjulian#define F_SET 2 10931145Sjulian#define F_FILESET 3 11031145Sjulian#define F_REPLACE 4 11131145Sjulian#define F_DELETE 5 11231145Sjulian 11351250Sru#define ROUNDUP(a) \ 11451250Sru ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 11531145Sjulian#define SETFUNC(f) { if (func) usage(); func = (f); } 11631145Sjulian 11713977Sphkint 1181553Srgrimesmain(argc, argv) 1191553Srgrimes int argc; 1201553Srgrimes char **argv; 1211553Srgrimes{ 12231145Sjulian int ch, func = 0; 12331145Sjulian int rtn = 0; 1241553Srgrimes 1251553Srgrimes pid = getpid(); 12624428Simp while ((ch = getopt(argc, argv, "andfsS")) != -1) 1271553Srgrimes switch((char)ch) { 1281553Srgrimes case 'a': 12931145Sjulian aflag = 1; 13031145Sjulian break; 1311553Srgrimes case 'd': 13231145Sjulian SETFUNC(F_DELETE); 13331145Sjulian break; 1341553Srgrimes case 'n': 1351553Srgrimes nflag = 1; 13631145Sjulian break; 13713977Sphk case 'S': 13831145Sjulian SETFUNC(F_REPLACE); 13931145Sjulian break; 1401553Srgrimes case 's': 14131145Sjulian SETFUNC(F_SET); 14231145Sjulian break; 1439874Sjkh case 'f' : 14431145Sjulian SETFUNC(F_FILESET); 14531145Sjulian break; 1461553Srgrimes case '?': 1471553Srgrimes default: 1481553Srgrimes usage(); 1491553Srgrimes } 15031145Sjulian argc -= optind; 15131145Sjulian argv += optind; 15231145Sjulian 15331145Sjulian if (!func) 15431145Sjulian func = F_GET; 15531145Sjulian switch (func) { 15631145Sjulian case F_GET: 15731145Sjulian if (aflag) { 15831145Sjulian if (argc != 0) 15931145Sjulian usage(); 16031145Sjulian search(0, print_entry); 16131145Sjulian } else { 16231145Sjulian if (argc != 1) 16331145Sjulian usage(); 16431145Sjulian get(argv[0]); 16531145Sjulian } 16631145Sjulian break; 16731145Sjulian case F_SET: 16831145Sjulian case F_REPLACE: 16931145Sjulian if (argc < 2 || argc > 5) 17031145Sjulian usage(); 17131145Sjulian if (func == F_REPLACE) 17231145Sjulian (void) delete(argv[0], NULL); 17331145Sjulian rtn = set(argc, argv) ? 1 : 0; 17431145Sjulian break; 17531145Sjulian case F_DELETE: 17631145Sjulian if (aflag) { 17731145Sjulian if (argc != 0) 17831145Sjulian usage(); 17931145Sjulian search(0, nuke_entry); 18031145Sjulian } else { 18131145Sjulian if (argc < 1 || argc > 2) 18231145Sjulian usage(); 18331145Sjulian rtn = delete(argv[0], argv[1]); 18431145Sjulian } 18531145Sjulian break; 18631145Sjulian case F_FILESET: 18731145Sjulian if (argc != 1) 18831145Sjulian usage(); 18931145Sjulian rtn = file(argv[0]); 19031145Sjulian break; 19131145Sjulian } 19231145Sjulian 19331145Sjulian return(rtn); 1941553Srgrimes} 1951553Srgrimes 1961553Srgrimes/* 1971553Srgrimes * Process a file to set standard arp entries 1981553Srgrimes */ 19913977Sphkint 20013977Sphkfile(char *name) 2011553Srgrimes{ 2021553Srgrimes FILE *fp; 2031553Srgrimes int i, retval; 2041553Srgrimes char line[100], arg[5][50], *args[5]; 2051553Srgrimes 20629060Scharnier if ((fp = fopen(name, "r")) == NULL) 20729060Scharnier errx(1, "cannot open %s", name); 2081553Srgrimes args[0] = &arg[0][0]; 2091553Srgrimes args[1] = &arg[1][0]; 2101553Srgrimes args[2] = &arg[2][0]; 2111553Srgrimes args[3] = &arg[3][0]; 2121553Srgrimes args[4] = &arg[4][0]; 2131553Srgrimes retval = 0; 2141553Srgrimes while(fgets(line, 100, fp) != NULL) { 21556127Skris i = sscanf(line, "%49s %49s %49s %49s %49s", arg[0], arg[1], 21656134Sjkh arg[2], arg[3], arg[4]); 2171553Srgrimes if (i < 2) { 21829060Scharnier warnx("bad line: %s", line); 2191553Srgrimes retval = 1; 2201553Srgrimes continue; 2211553Srgrimes } 2221553Srgrimes if (set(i, args)) 2231553Srgrimes retval = 1; 2241553Srgrimes } 2251553Srgrimes fclose(fp); 2261553Srgrimes return (retval); 2271553Srgrimes} 2281553Srgrimes 22913977Sphkvoid 23013977Sphkgetsocket(void) 23113977Sphk{ 2321553Srgrimes if (s < 0) { 2331553Srgrimes s = socket(PF_ROUTE, SOCK_RAW, 0); 23429060Scharnier if (s < 0) 23529060Scharnier err(1, "socket"); 2361553Srgrimes } 2371553Srgrimes} 2381553Srgrimes 2391553Srgrimesstruct sockaddr_in so_mask = {8, 0, 0, { 0xffffffff}}; 2401553Srgrimesstruct sockaddr_inarp blank_sin = {sizeof(blank_sin), AF_INET }, sin_m; 2411553Srgrimesstruct sockaddr_dl blank_sdl = {sizeof(blank_sdl), AF_LINK }, sdl_m; 2421553Srgrimesint expire_time, flags, export_only, doing_proxy, found_entry; 2431553Srgrimesstruct { 2441553Srgrimes struct rt_msghdr m_rtm; 2451553Srgrimes char m_space[512]; 2461553Srgrimes} m_rtmsg; 2471553Srgrimes 2481553Srgrimes/* 2498857Srgrimes * Set an individual arp entry 2501553Srgrimes */ 25113977Sphkint 25213977Sphkset(int argc, char **argv) 2531553Srgrimes{ 2541553Srgrimes struct hostent *hp; 2551553Srgrimes register struct sockaddr_inarp *sin = &sin_m; 2561553Srgrimes register struct sockaddr_dl *sdl; 2571553Srgrimes register struct rt_msghdr *rtm = &(m_rtmsg.m_rtm); 2581553Srgrimes u_char *ea; 2591553Srgrimes char *host = argv[0], *eaddr = argv[1]; 2601553Srgrimes 2611553Srgrimes getsocket(); 2621553Srgrimes argc -= 2; 2631553Srgrimes argv += 2; 2641553Srgrimes sdl_m = blank_sdl; 2651553Srgrimes sin_m = blank_sin; 2661553Srgrimes sin->sin_addr.s_addr = inet_addr(host); 2671553Srgrimes if (sin->sin_addr.s_addr == -1) { 2681553Srgrimes if (!(hp = gethostbyname(host))) { 26929060Scharnier warnx("%s: %s", host, hstrerror(h_errno)); 2701553Srgrimes return (1); 2711553Srgrimes } 2721553Srgrimes bcopy((char *)hp->h_addr, (char *)&sin->sin_addr, 2731553Srgrimes sizeof sin->sin_addr); 2741553Srgrimes } 2751553Srgrimes doing_proxy = flags = export_only = expire_time = 0; 2761553Srgrimes while (argc-- > 0) { 2771553Srgrimes if (strncmp(argv[0], "temp", 4) == 0) { 2781553Srgrimes struct timeval time; 2791553Srgrimes gettimeofday(&time, 0); 2801553Srgrimes expire_time = time.tv_sec + 20 * 60; 2811553Srgrimes } 2821553Srgrimes else if (strncmp(argv[0], "pub", 3) == 0) { 2831553Srgrimes flags |= RTF_ANNOUNCE; 2841553Srgrimes doing_proxy = SIN_PROXY; 2851553Srgrimes } else if (strncmp(argv[0], "trail", 5) == 0) { 2861553Srgrimes printf("%s: Sending trailers is no longer supported\n", 2871553Srgrimes host); 2881553Srgrimes } 2891553Srgrimes argv++; 2901553Srgrimes } 29113977Sphk ea = (u_char *)LLADDR(&sdl_m); 29213977Sphk if (doing_proxy && !strcmp(eaddr, "auto")) { 29313977Sphk if (!get_ether_addr(sin->sin_addr.s_addr, ea)) { 29473135Sru printf("no interface found for %s\n", 29573135Sru inet_ntoa(sin->sin_addr)); 29613977Sphk return (1); 29713977Sphk } 29813977Sphk sdl_m.sdl_alen = 6; 29913977Sphk } else { 30020690Snate if (my_ether_aton(eaddr, ea) == 0) 30113977Sphk sdl_m.sdl_alen = 6; 30213977Sphk } 3031553Srgrimestryagain: 3041553Srgrimes if (rtmsg(RTM_GET) < 0) { 30529060Scharnier warn("%s", host); 3061553Srgrimes return (1); 3071553Srgrimes } 3081553Srgrimes sin = (struct sockaddr_inarp *)(rtm + 1); 30951250Sru sdl = (struct sockaddr_dl *)(ROUNDUP(sin->sin_len) + (char *)sin); 3101553Srgrimes if (sin->sin_addr.s_addr == sin_m.sin_addr.s_addr) { 3111553Srgrimes if (sdl->sdl_family == AF_LINK && 3121553Srgrimes (rtm->rtm_flags & RTF_LLINFO) && 3131553Srgrimes !(rtm->rtm_flags & RTF_GATEWAY)) switch (sdl->sdl_type) { 3141553Srgrimes case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023: 3151553Srgrimes case IFT_ISO88024: case IFT_ISO88025: 3161553Srgrimes goto overwrite; 3171553Srgrimes } 3181553Srgrimes if (doing_proxy == 0) { 3191553Srgrimes printf("set: can only proxy for %s\n", host); 3201553Srgrimes return (1); 3211553Srgrimes } 3221553Srgrimes if (sin_m.sin_other & SIN_PROXY) { 3231553Srgrimes printf("set: proxy entry exists for non 802 device\n"); 3241553Srgrimes return(1); 3251553Srgrimes } 3261553Srgrimes sin_m.sin_other = SIN_PROXY; 3271553Srgrimes export_only = 1; 3281553Srgrimes goto tryagain; 3291553Srgrimes } 3301553Srgrimesoverwrite: 3311553Srgrimes if (sdl->sdl_family != AF_LINK) { 3321553Srgrimes printf("cannot intuit interface index and type for %s\n", host); 3331553Srgrimes return (1); 3341553Srgrimes } 3351553Srgrimes sdl_m.sdl_type = sdl->sdl_type; 3361553Srgrimes sdl_m.sdl_index = sdl->sdl_index; 3371553Srgrimes return (rtmsg(RTM_ADD)); 3381553Srgrimes} 3391553Srgrimes 3401553Srgrimes/* 3411553Srgrimes * Display an individual arp entry 3421553Srgrimes */ 34331145Sjulianint 34413977Sphkget(char *host) 3451553Srgrimes{ 3461553Srgrimes struct hostent *hp; 3471553Srgrimes struct sockaddr_inarp *sin = &sin_m; 3481553Srgrimes 3491553Srgrimes sin_m = blank_sin; 3501553Srgrimes sin->sin_addr.s_addr = inet_addr(host); 3511553Srgrimes if (sin->sin_addr.s_addr == -1) { 35229060Scharnier if (!(hp = gethostbyname(host))) 35329060Scharnier errx(1, "%s: %s", host, hstrerror(h_errno)); 3541553Srgrimes bcopy((char *)hp->h_addr, (char *)&sin->sin_addr, 3551553Srgrimes sizeof sin->sin_addr); 3561553Srgrimes } 35731145Sjulian search(sin->sin_addr.s_addr, print_entry); 3581553Srgrimes if (found_entry == 0) { 3591553Srgrimes printf("%s (%s) -- no entry\n", 3601553Srgrimes host, inet_ntoa(sin->sin_addr)); 36131145Sjulian return(1); 3621553Srgrimes } 36331145Sjulian return(0); 3641553Srgrimes} 3651553Srgrimes 3661553Srgrimes/* 3678857Srgrimes * Delete an arp entry 3681553Srgrimes */ 36913977Sphkint 37013977Sphkdelete(char *host, char *info) 3711553Srgrimes{ 3721553Srgrimes struct hostent *hp; 3731553Srgrimes register struct sockaddr_inarp *sin = &sin_m; 3741553Srgrimes register struct rt_msghdr *rtm = &m_rtmsg.m_rtm; 3751553Srgrimes struct sockaddr_dl *sdl; 3761553Srgrimes 3771553Srgrimes getsocket(); 3781553Srgrimes sin_m = blank_sin; 37972051Sru if (info && strncmp(info, "pro", 3) == 0) 38072051Sru sin_m.sin_other = SIN_PROXY; 3811553Srgrimes sin->sin_addr.s_addr = inet_addr(host); 3821553Srgrimes if (sin->sin_addr.s_addr == -1) { 3831553Srgrimes if (!(hp = gethostbyname(host))) { 38429060Scharnier warnx("%s: %s", host, hstrerror(h_errno)); 3851553Srgrimes return (1); 3861553Srgrimes } 3871553Srgrimes bcopy((char *)hp->h_addr, (char *)&sin->sin_addr, 3881553Srgrimes sizeof sin->sin_addr); 3891553Srgrimes } 3901553Srgrimestryagain: 3911553Srgrimes if (rtmsg(RTM_GET) < 0) { 39229060Scharnier warn("%s", host); 3931553Srgrimes return (1); 3941553Srgrimes } 3951553Srgrimes sin = (struct sockaddr_inarp *)(rtm + 1); 39651250Sru sdl = (struct sockaddr_dl *)(ROUNDUP(sin->sin_len) + (char *)sin); 3971553Srgrimes if (sin->sin_addr.s_addr == sin_m.sin_addr.s_addr) { 3981553Srgrimes if (sdl->sdl_family == AF_LINK && 3991553Srgrimes (rtm->rtm_flags & RTF_LLINFO) && 4001553Srgrimes !(rtm->rtm_flags & RTF_GATEWAY)) switch (sdl->sdl_type) { 4011553Srgrimes case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023: 4021553Srgrimes case IFT_ISO88024: case IFT_ISO88025: 4031553Srgrimes goto delete; 4041553Srgrimes } 4051553Srgrimes } 4061553Srgrimes if (sin_m.sin_other & SIN_PROXY) { 4071553Srgrimes fprintf(stderr, "delete: can't locate %s\n",host); 4081553Srgrimes return (1); 4091553Srgrimes } else { 4101553Srgrimes sin_m.sin_other = SIN_PROXY; 4111553Srgrimes goto tryagain; 4121553Srgrimes } 4131553Srgrimesdelete: 4141553Srgrimes if (sdl->sdl_family != AF_LINK) { 4151553Srgrimes printf("cannot locate %s\n", host); 4161553Srgrimes return (1); 4171553Srgrimes } 41813977Sphk if (rtmsg(RTM_DELETE) == 0) { 4191553Srgrimes printf("%s (%s) deleted\n", host, inet_ntoa(sin->sin_addr)); 42013977Sphk return (0); 42113977Sphk } 42213977Sphk return (1); 4231553Srgrimes} 4241553Srgrimes 4251553Srgrimes/* 42631145Sjulian * Search the arp table and do some action on matching entries 4271553Srgrimes */ 42813977Sphkvoid 42931145Sjuliansearch(u_long addr, void (*action)(struct sockaddr_dl *sdl, 43031145Sjulian struct sockaddr_inarp *sin, struct rt_msghdr *rtm)) 4311553Srgrimes{ 4321553Srgrimes int mib[6]; 4331553Srgrimes size_t needed; 43431145Sjulian char *lim, *buf, *next; 4351553Srgrimes struct rt_msghdr *rtm; 4361553Srgrimes struct sockaddr_inarp *sin; 4371553Srgrimes struct sockaddr_dl *sdl; 4381553Srgrimes extern int h_errno; 4391553Srgrimes 4401553Srgrimes mib[0] = CTL_NET; 4411553Srgrimes mib[1] = PF_ROUTE; 4421553Srgrimes mib[2] = 0; 4431553Srgrimes mib[3] = AF_INET; 4441553Srgrimes mib[4] = NET_RT_FLAGS; 4451553Srgrimes mib[5] = RTF_LLINFO; 4461553Srgrimes if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) 44729060Scharnier errx(1, "route-sysctl-estimate"); 4481553Srgrimes if ((buf = malloc(needed)) == NULL) 44929060Scharnier errx(1, "malloc"); 4501553Srgrimes if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) 45129060Scharnier errx(1, "actual retrieval of routing table"); 4521553Srgrimes lim = buf + needed; 4531553Srgrimes for (next = buf; next < lim; next += rtm->rtm_msglen) { 4541553Srgrimes rtm = (struct rt_msghdr *)next; 4551553Srgrimes sin = (struct sockaddr_inarp *)(rtm + 1); 45651456Sru (char *)sdl = (char *)sin + ROUNDUP(sin->sin_len); 4571553Srgrimes if (addr) { 4581553Srgrimes if (addr != sin->sin_addr.s_addr) 4591553Srgrimes continue; 4601553Srgrimes found_entry = 1; 4611553Srgrimes } 46231145Sjulian (*action)(sdl, sin, rtm); 4631553Srgrimes } 4641553Srgrimes} 4651553Srgrimes 46631145Sjulian/* 46731145Sjulian * Display an arp entry 46831145Sjulian */ 46913977Sphkvoid 47031145Sjulianprint_entry(struct sockaddr_dl *sdl, 47131145Sjulian struct sockaddr_inarp *sin, struct rt_msghdr *rtm) 47231145Sjulian{ 47331145Sjulian char *host; 47431145Sjulian extern int h_errno; 47531145Sjulian struct hostent *hp; 47644627Sjulian int seg; 47731145Sjulian 47831145Sjulian if (nflag == 0) 47931145Sjulian hp = gethostbyaddr((caddr_t)&(sin->sin_addr), 48031145Sjulian sizeof sin->sin_addr, AF_INET); 48131145Sjulian else 48231145Sjulian hp = 0; 48331145Sjulian if (hp) 48431145Sjulian host = hp->h_name; 48531145Sjulian else { 48631145Sjulian host = "?"; 48731145Sjulian if (h_errno == TRY_AGAIN) 48831145Sjulian nflag = 1; 48931145Sjulian } 49031145Sjulian printf("%s (%s) at ", host, inet_ntoa(sin->sin_addr)); 49131145Sjulian if (sdl->sdl_alen) 49231145Sjulian ether_print(LLADDR(sdl)); 49331145Sjulian else 49431145Sjulian printf("(incomplete)"); 49531145Sjulian if (rtm->rtm_rmx.rmx_expire == 0) 49631145Sjulian printf(" permanent"); 49731145Sjulian if (sin->sin_other & SIN_PROXY) 49831145Sjulian printf(" published (proxy only)"); 49931145Sjulian if (rtm->rtm_addrs & RTA_NETMASK) { 50031145Sjulian sin = (struct sockaddr_inarp *) 50151250Sru (ROUNDUP(sdl->sdl_len) + (char *)sdl); 50231145Sjulian if (sin->sin_addr.s_addr == 0xffffffff) 50331145Sjulian printf(" published"); 50431145Sjulian if (sin->sin_len != 8) 50551250Sru printf("(weird)"); 50631145Sjulian } 50744627Sjulian switch(sdl->sdl_type) { 50844627Sjulian case IFT_ETHER: 50944627Sjulian printf(" [ethernet]"); 51044627Sjulian break; 51144627Sjulian case IFT_ISO88025: 51244627Sjulian printf(" [token-ring]"); 51344627Sjulian break; 51444627Sjulian default: 51544627Sjulian } 51644627Sjulian if (sdl->sdl_rcf != NULL) { 51744627Sjulian printf(" rt=%x", ntohs(sdl->sdl_rcf)); 51844627Sjulian for (seg = 0; seg < ((((ntohs(sdl->sdl_rcf) & 0x1f00) >> 8) - 2 ) / 2); seg++) 51944627Sjulian printf(":%x", ntohs(sdl->sdl_route[seg])); 52044627Sjulian } 52144627Sjulian 52231145Sjulian printf("\n"); 52344627Sjulian 52431145Sjulian} 52531145Sjulian 52631145Sjulian/* 52731145Sjulian * Nuke an arp entry 52831145Sjulian */ 52931145Sjulianvoid 53031145Sjuliannuke_entry(struct sockaddr_dl *sdl, 53131145Sjulian struct sockaddr_inarp *sin, struct rt_msghdr *rtm) 53231145Sjulian{ 53331145Sjulian char ip[20]; 53431145Sjulian 53531145Sjulian snprintf(ip, sizeof(ip), "%s", inet_ntoa(sin->sin_addr)); 53631145Sjulian delete(ip, NULL); 53731145Sjulian} 53831145Sjulian 53931145Sjulianvoid 54013977Sphkether_print(u_char *cp) 5411553Srgrimes{ 5421553Srgrimes printf("%x:%x:%x:%x:%x:%x", cp[0], cp[1], cp[2], cp[3], cp[4], cp[5]); 5431553Srgrimes} 5441553Srgrimes 54513977Sphkint 54620690Snatemy_ether_aton(char *a, u_char *n) 5471553Srgrimes{ 5481553Srgrimes int i, o[6]; 5491553Srgrimes 5501553Srgrimes i = sscanf(a, "%x:%x:%x:%x:%x:%x", &o[0], &o[1], &o[2], 5511553Srgrimes &o[3], &o[4], &o[5]); 5521553Srgrimes if (i != 6) { 55329060Scharnier warnx("invalid Ethernet address '%s'", a); 5541553Srgrimes return (1); 5551553Srgrimes } 5561553Srgrimes for (i=0; i<6; i++) 5571553Srgrimes n[i] = o[i]; 5581553Srgrimes return (0); 5591553Srgrimes} 5601553Srgrimes 56113977Sphkvoid 56213977Sphkusage(void) 5631553Srgrimes{ 56431145Sjulian fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n", 56529060Scharnier "usage: arp [-n] hostname", 56631145Sjulian " arp [-n] -a", 56771905Sarchie " arp -d hostname [proxy]", 56831145Sjulian " arp -d -a", 56929060Scharnier " arp -s hostname ether_addr [temp] [pub]", 57029060Scharnier " arp -S hostname ether_addr [temp] [pub]", 57129060Scharnier " arp -f filename"); 5721553Srgrimes exit(1); 5731553Srgrimes} 5741553Srgrimes 57513977Sphkint 57613977Sphkrtmsg(int cmd) 5771553Srgrimes{ 5781553Srgrimes static int seq; 5791553Srgrimes int rlen; 5801553Srgrimes register struct rt_msghdr *rtm = &m_rtmsg.m_rtm; 5811553Srgrimes register char *cp = m_rtmsg.m_space; 5821553Srgrimes register int l; 5831553Srgrimes 5841553Srgrimes errno = 0; 5851553Srgrimes if (cmd == RTM_DELETE) 5861553Srgrimes goto doit; 5871553Srgrimes bzero((char *)&m_rtmsg, sizeof(m_rtmsg)); 5881553Srgrimes rtm->rtm_flags = flags; 5891553Srgrimes rtm->rtm_version = RTM_VERSION; 5901553Srgrimes 5911553Srgrimes switch (cmd) { 5921553Srgrimes default: 59329060Scharnier errx(1, "internal wrong cmd"); 5941553Srgrimes case RTM_ADD: 5951553Srgrimes rtm->rtm_addrs |= RTA_GATEWAY; 5961553Srgrimes rtm->rtm_rmx.rmx_expire = expire_time; 5971553Srgrimes rtm->rtm_inits = RTV_EXPIRE; 5981553Srgrimes rtm->rtm_flags |= (RTF_HOST | RTF_STATIC); 5991553Srgrimes sin_m.sin_other = 0; 6001553Srgrimes if (doing_proxy) { 6011553Srgrimes if (export_only) 6021553Srgrimes sin_m.sin_other = SIN_PROXY; 6031553Srgrimes else { 6041553Srgrimes rtm->rtm_addrs |= RTA_NETMASK; 6051553Srgrimes rtm->rtm_flags &= ~RTF_HOST; 6061553Srgrimes } 6071553Srgrimes } 6081553Srgrimes /* FALLTHROUGH */ 6091553Srgrimes case RTM_GET: 6101553Srgrimes rtm->rtm_addrs |= RTA_DST; 6111553Srgrimes } 6121553Srgrimes#define NEXTADDR(w, s) \ 6131553Srgrimes if (rtm->rtm_addrs & (w)) { \ 61451250Sru bcopy((char *)&s, cp, sizeof(s)); cp += ROUNDUP(sizeof(s));} 6151553Srgrimes 6161553Srgrimes NEXTADDR(RTA_DST, sin_m); 6171553Srgrimes NEXTADDR(RTA_GATEWAY, sdl_m); 6181553Srgrimes NEXTADDR(RTA_NETMASK, so_mask); 6191553Srgrimes 6201553Srgrimes rtm->rtm_msglen = cp - (char *)&m_rtmsg; 6211553Srgrimesdoit: 6221553Srgrimes l = rtm->rtm_msglen; 6231553Srgrimes rtm->rtm_seq = ++seq; 6241553Srgrimes rtm->rtm_type = cmd; 6251553Srgrimes if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) { 6261553Srgrimes if (errno != ESRCH || cmd != RTM_DELETE) { 62729060Scharnier warn("writing to routing socket"); 6281553Srgrimes return (-1); 6291553Srgrimes } 6301553Srgrimes } 6311553Srgrimes do { 6321553Srgrimes l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg)); 6331553Srgrimes } while (l > 0 && (rtm->rtm_seq != seq || rtm->rtm_pid != pid)); 6341553Srgrimes if (l < 0) 63529060Scharnier warn("read from routing socket"); 6361553Srgrimes return (0); 6371553Srgrimes} 6381553Srgrimes 63913977Sphk/* 64013977Sphk * get_ether_addr - get the hardware address of an interface on the 64113977Sphk * the same subnet as ipaddr. 64213977Sphk */ 64313977Sphk#define MAX_IFS 32 64413977Sphk 64513977Sphkint 64657727Sshinget_ether_addr(u_int32_t ipaddr, u_char *hwaddr) 64713977Sphk{ 64813977Sphk struct ifreq *ifr, *ifend, *ifp; 64957727Sshin u_int32_t ina, mask; 65013977Sphk struct sockaddr_dl *dla; 65113977Sphk struct ifreq ifreq; 65213977Sphk struct ifconf ifc; 65313977Sphk struct ifreq ifs[MAX_IFS]; 65413977Sphk int s; 65513977Sphk 65613977Sphk s = socket(AF_INET, SOCK_DGRAM, 0); 65729060Scharnier if (s < 0) 65829060Scharnier err(1, "socket"); 65913977Sphk 66013977Sphk ifc.ifc_len = sizeof(ifs); 66113977Sphk ifc.ifc_req = ifs; 66213977Sphk if (ioctl(s, SIOCGIFCONF, &ifc) < 0) { 66329060Scharnier warnx("ioctl(SIOCGIFCONF)"); 66413977Sphk close(s); 66513977Sphk return 0; 66613977Sphk } 66713977Sphk 66813977Sphk /* 66913977Sphk * Scan through looking for an interface with an Internet 67013977Sphk * address on the same subnet as `ipaddr'. 67113977Sphk */ 67213977Sphk ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len); 67313977Sphk for (ifr = ifc.ifc_req; ifr < ifend; ) { 67413977Sphk if (ifr->ifr_addr.sa_family == AF_INET) { 67513977Sphk ina = ((struct sockaddr_in *) 67613977Sphk &ifr->ifr_addr)->sin_addr.s_addr; 67713977Sphk strncpy(ifreq.ifr_name, ifr->ifr_name, 67813977Sphk sizeof(ifreq.ifr_name)); 67913977Sphk /* 68013977Sphk * Check that the interface is up, 68113977Sphk * and not point-to-point or loopback. 68213977Sphk */ 68313977Sphk if (ioctl(s, SIOCGIFFLAGS, &ifreq) < 0) 68413977Sphk continue; 68513977Sphk if ((ifreq.ifr_flags & 68613977Sphk (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT| 68713977Sphk IFF_LOOPBACK|IFF_NOARP)) 68813977Sphk != (IFF_UP|IFF_BROADCAST)) 68913977Sphk goto nextif; 69013977Sphk /* 69113977Sphk * Get its netmask and check that it's on 69213977Sphk * the right subnet. 69313977Sphk */ 69413977Sphk if (ioctl(s, SIOCGIFNETMASK, &ifreq) < 0) 69513977Sphk continue; 69613977Sphk mask = ((struct sockaddr_in *) 69713977Sphk &ifreq.ifr_addr)->sin_addr.s_addr; 69813977Sphk if ((ipaddr & mask) != (ina & mask)) 69913977Sphk goto nextif; 70013977Sphk break; 70113977Sphk } 70213977Sphknextif: 70347753Sarchie ifr = (struct ifreq *) ((char *)&ifr->ifr_addr 70447753Sarchie + MAX(ifr->ifr_addr.sa_len, sizeof(ifr->ifr_addr))); 70513977Sphk } 70613977Sphk 70713977Sphk if (ifr >= ifend) { 70813977Sphk close(s); 70913977Sphk return 0; 71013977Sphk } 71113977Sphk 71213977Sphk /* 71313977Sphk * Now scan through again looking for a link-level address 71413977Sphk * for this interface. 71513977Sphk */ 71613977Sphk ifp = ifr; 71713977Sphk for (ifr = ifc.ifc_req; ifr < ifend; ) { 71813977Sphk if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0 71913977Sphk && ifr->ifr_addr.sa_family == AF_LINK) { 72013977Sphk /* 72113977Sphk * Found the link-level address - copy it out 72213977Sphk */ 72313977Sphk dla = (struct sockaddr_dl *) &ifr->ifr_addr; 72413977Sphk memcpy(hwaddr, LLADDR(dla), dla->sdl_alen); 72513977Sphk close (s); 72613977Sphk printf("using interface %s for proxy with address ", 72713977Sphk ifp->ifr_name); 72813977Sphk ether_print(hwaddr); 72913977Sphk printf("\n"); 73013977Sphk return dla->sdl_alen; 73113977Sphk } 73247753Sarchie ifr = (struct ifreq *) ((char *)&ifr->ifr_addr 73347753Sarchie + MAX(ifr->ifr_addr.sa_len, sizeof(ifr->ifr_addr))); 73413977Sphk } 73513977Sphk return 0; 73613977Sphk} 737