/* * Copyright (c) 2003-2012 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * Copyright (c) 1984, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Sun Microsystems, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #if 0 #ifndef lint static char const copyright[] = "@(#) Copyright (c) 1984, 1993\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #endif /* * arp - display, set, and delete arp table entries */ #include #include #include #include #include #include #include #include #include #include #include #if 0 #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include typedef void (action_fn)(struct sockaddr_dl *sdl, struct sockaddr_inarp *s_in, struct rt_msghdr *rtm); typedef void (action_ext_fn)(struct sockaddr_dl *sdl, struct sockaddr_inarp *s_in, struct rt_msghdr_ext *rtm); static int search(in_addr_t addr, action_fn *action); static int search_ext(in_addr_t addr, action_ext_fn *action); static action_fn print_entry; static action_fn nuke_entry; static action_ext_fn print_entry_ext; static char *print_lladdr(struct sockaddr_dl *); static int delete(char *host, int do_proxy); static void usage(void); static int set(int argc, char **argv); static int get(char *host); static int file(char *name); static struct rt_msghdr *rtmsg(int cmd, struct sockaddr_inarp *dst, struct sockaddr_dl *sdl); static int get_ether_addr(in_addr_t ipaddr, struct ether_addr *hwaddr); static struct sockaddr_inarp *getaddr(char *host); static int valid_type(int type); static char *sec2str(time_t); static int nflag; /* no reverse dns lookups */ static int xflag; /* extended link-layer reachability information */ static char *rifname; static int expire_time, flags, doing_proxy, proxy_only; static char *boundif = NULL; static unsigned int ifscope = 0; /* which function we're supposed to do */ #define F_GET 1 #define F_SET 2 #define F_FILESET 3 #define F_REPLACE 4 #define F_DELETE 5 #ifndef SA_SIZE #define SA_SIZE(sa) \ ( (!(sa) || ((struct sockaddr *)(sa))->sa_len == 0) ? \ sizeof(uint32_t) : \ 1 + ( (((struct sockaddr *)(sa))->sa_len - 1) | (sizeof(uint32_t) - 1) ) ) #endif #define SETFUNC(f) { if (func) usage(); func = (f); } int main(int argc, char *argv[]) { int ch, func = 0; int rtn = 0; int aflag = 0; /* do it for all entries */ int lflag = 0; uint32_t ifindex = 0; while ((ch = getopt(argc, argv, "andflsSi:x")) != -1) switch((char)ch) { case 'a': aflag = 1; break; case 'd': SETFUNC(F_DELETE); break; case 'n': nflag = 1; break; case 'l': lflag = 1; break; case 'S': SETFUNC(F_REPLACE); break; case 's': SETFUNC(F_SET); break; case 'f' : SETFUNC(F_FILESET); break; case 'i': rifname = optarg; break; case 'x': xflag = 1; lflag = 1; break; case '?': default: usage(); } argc -= optind; argv += optind; if (!func) func = F_GET; if (rifname) { if (func != F_GET && !(func == F_DELETE && aflag)) errx(1, "-i not applicable to this operation"); if ((ifindex = if_nametoindex(rifname)) == 0) { if (errno == ENXIO) errx(1, "interface %s does not exist", rifname); else err(1, "if_nametoindex(%s)", rifname); } } switch (func) { case F_GET: if (aflag) { if (argc != 0) usage(); if (lflag) { printf("%-23s %-17s %-9.9s %-9.9s %8.8s %4s " "%4s", "Neighbor", "Linklayer Address", "Expire(O)", "Expire(I)", "Netif", "Refs", "Prbs"); if (xflag) printf(" %-7.7s %-7.7s %-7.7s", "RSSI", "LQM", "NPM"); printf("\n"); search_ext(0, print_entry_ext); } else { search(0, print_entry); } } else { if (argc != 1) usage(); rtn = get(argv[0]); } break; case F_SET: case F_REPLACE: if (argc < 2 || argc > 6) usage(); if (func == F_REPLACE) (void)delete(argv[0], 0); rtn = set(argc, argv) ? 1 : 0; break; case F_DELETE: if (aflag) { if (argc != 0) usage(); search(0, nuke_entry); } else { int do_proxy = 0; int i; for (i = 1; i < argc; i++) { if (strncmp(argv[i], "pub", sizeof("pub")) == 0) { do_proxy = SIN_PROXY; } else if (strncmp(argv[i], "ifscope", sizeof("ifscope")) == 0) { if (i + 1 >= argc) { printf("ifscope needs an interface parameter\n"); return (1); } boundif = argv[++i]; if ((ifscope = if_nametoindex(boundif)) == 0) errx(1, "ifscope has bad interface name: %s", boundif); } else { usage(); } } if (i > argc) usage(); rtn = delete(argv[0], do_proxy); } break; case F_FILESET: if (argc != 1) usage(); rtn = file(argv[0]); break; } return (rtn); } /* * Process a file to set standard arp entries */ static int file(char *name) { FILE *fp; int i, retval; char line[128], arg[7][50], *args[7], *p; if ((fp = fopen(name, "r")) == NULL) err(1, "cannot open %s", name); args[0] = &arg[0][0]; args[1] = &arg[1][0]; args[2] = &arg[2][0]; args[3] = &arg[3][0]; args[4] = &arg[4][0]; args[5] = &arg[5][0]; args[6] = &arg[6][0]; retval = 0; while(fgets(line, sizeof(line), fp) != NULL) { if ((p = strchr(line, '#')) != NULL) *p = '\0'; for (p = line; isblank(*p); p++); if (*p == '\n' || *p == '\0') continue; i = sscanf(p, "%49s %49s %49s %49s %49s %49s %49s", arg[0], arg[1], arg[2], arg[3], arg[4], arg[5], arg[6]); if (i < 2) { warnx("bad line: %s", line); retval = 1; continue; } if (set(i, args)) retval = 1; } fclose(fp); return (retval); } /* * Given a hostname, fills up a (static) struct sockaddr_inarp with * the address of the host and returns a pointer to the * structure. */ static struct sockaddr_inarp * getaddr(char *host) { struct hostent *hp; static struct sockaddr_inarp reply; bzero(&reply, sizeof(reply)); reply.sin_len = sizeof(reply); reply.sin_family = AF_INET; reply.sin_addr.s_addr = inet_addr(host); if (reply.sin_addr.s_addr == INADDR_NONE) { if (!(hp = gethostbyname(host))) { warnx("%s: %s", host, hstrerror(h_errno)); return (NULL); } bcopy((char *)hp->h_addr, (char *)&reply.sin_addr, sizeof reply.sin_addr); } return (&reply); } /* * Returns true if the type is a valid one for ARP. */ static int valid_type(int type) { switch (type) { case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023: case IFT_ISO88024: #if 0 case IFT_ISO88025: #endif case IFT_L2VLAN: #ifdef IFT_BRIDGE case IFT_BRIDGE: #endif return (1); default: return (0); } } /* * Set an individual arp entry */ static int set(int argc, char **argv) { struct sockaddr_inarp *addr; struct sockaddr_inarp *dst; /* what are we looking for */ struct sockaddr_dl *sdl; struct rt_msghdr *rtm; struct ether_addr *ea; char *host = argv[0], *eaddr = argv[1]; struct sockaddr_dl sdl_m; argc -= 2; argv += 2; bzero(&sdl_m, sizeof(sdl_m)); sdl_m.sdl_len = sizeof(sdl_m); sdl_m.sdl_family = AF_LINK; dst = getaddr(host); if (dst == NULL) return (1); doing_proxy = flags = proxy_only = expire_time = 0; boundif = NULL; ifscope = 0; while (argc-- > 0) { if (strncmp(argv[0], "temp", sizeof("temp")) == 0) { struct timeval tv; gettimeofday(&tv, 0); expire_time = tv.tv_sec + 20 * 60; } else if (strncmp(argv[0], "pub", sizeof("pub")) == 0) { flags |= RTF_ANNOUNCE; doing_proxy = 1; if (argc && strncmp(argv[1], "only", sizeof("only")) == 0) { proxy_only = 1; dst->sin_other = SIN_PROXY; argc--; argv++; } } else if (strncmp(argv[0], "blackhole", sizeof("blackhole")) == 0) { flags |= RTF_BLACKHOLE; } else if (strncmp(argv[0], "reject", sizeof("reject")) == 0) { flags |= RTF_REJECT; } else if (strncmp(argv[0], "trail", sizeof("trail")) == 0) { /* XXX deprecated and undocumented feature */ printf("%s: Sending trailers is no longer supported\n", host); } else if (strncmp(argv[0], "ifscope", sizeof("ifscope")) == 0) { if (argc < 1) { printf("ifscope needs an interface parameter\n"); return (1); } boundif = argv[1]; if ((ifscope = if_nametoindex(boundif)) == 0) errx(1, "ifscope has bad interface name: %s", boundif); argc--; argv++; } argv++; } ea = (struct ether_addr *)LLADDR(&sdl_m); if (doing_proxy && !strcmp(eaddr, "auto")) { if (!get_ether_addr(dst->sin_addr.s_addr, ea)) { printf("no interface found for %s\n", inet_ntoa(dst->sin_addr)); return (1); } sdl_m.sdl_alen = ETHER_ADDR_LEN; } else { struct ether_addr *ea1 = ether_aton(eaddr); if (ea1 == NULL) { warnx("invalid Ethernet address '%s'", eaddr); return (1); } else { *ea = *ea1; sdl_m.sdl_alen = ETHER_ADDR_LEN; } } for (;;) { /* try at most twice */ rtm = rtmsg(RTM_GET, dst, &sdl_m); if (rtm == NULL) { warn("%s", host); return (1); } addr = (struct sockaddr_inarp *)(rtm + 1); sdl = (struct sockaddr_dl *)(SA_SIZE(addr) + (char *)addr); if (addr->sin_addr.s_addr != dst->sin_addr.s_addr) break; if (sdl->sdl_family == AF_LINK && (rtm->rtm_flags & RTF_LLINFO) && !(rtm->rtm_flags & RTF_GATEWAY) && valid_type(sdl->sdl_type) ) break; /* * If we asked for a scope entry and did not get one or * did not asked for a scope entry and got one, we can * proceed. */ if ((ifscope != 0) != (rtm->rtm_flags & RTF_IFSCOPE)) break; if (doing_proxy == 0) { printf("set: can only proxy for %s\n", host); return (1); } if (dst->sin_other & SIN_PROXY) { printf("set: proxy entry exists for non 802 device\n"); return (1); } dst->sin_other = SIN_PROXY; proxy_only = 1; } if (sdl->sdl_family != AF_LINK) { printf("cannot intuit interface index and type for %s\n", host); return (1); } sdl_m.sdl_type = sdl->sdl_type; sdl_m.sdl_index = sdl->sdl_index; return (rtmsg(RTM_ADD, dst, &sdl_m) == NULL); } /* * Display an individual arp entry */ static int get(char *host) { struct sockaddr_inarp *addr; addr = getaddr(host); if (addr == NULL) return (1); if (0 == search(addr->sin_addr.s_addr, print_entry)) { printf("%s (%s) -- no entry", host, inet_ntoa(addr->sin_addr)); if (rifname) printf(" on %s", rifname); printf("\n"); return (1); } return (0); } /* * Delete an arp entry */ static int delete(char *host, int do_proxy) { struct sockaddr_inarp *addr, *dst; struct rt_msghdr *rtm; struct sockaddr_dl *sdl; dst = getaddr(host); if (dst == NULL) return (1); dst->sin_other = do_proxy; for (;;) { /* try twice */ rtm = rtmsg(RTM_GET, dst, NULL); if (rtm == NULL) { warn("%s", host); return (1); } addr = (struct sockaddr_inarp *)(rtm + 1); sdl = (struct sockaddr_dl *)(SA_SIZE(addr) + (char *)addr); if (addr->sin_addr.s_addr == dst->sin_addr.s_addr && sdl->sdl_family == AF_LINK && (rtm->rtm_flags & RTF_LLINFO) && !(rtm->rtm_flags & RTF_GATEWAY) && valid_type(sdl->sdl_type) ) break; /* found it */ if (dst->sin_other & SIN_PROXY) { fprintf(stderr, "delete: cannot locate %s\n",host); return (1); } dst->sin_other = SIN_PROXY; } if (rtmsg(RTM_DELETE, dst, NULL) != NULL) { printf("%s (%s) deleted\n", host, inet_ntoa(addr->sin_addr)); return (0); } return (1); } /* * Search the arp table and do some action on matching entries */ static int search(in_addr_t addr, action_fn *action) { int mib[6]; size_t needed; char *lim, *buf, *newbuf, *next; struct rt_msghdr *rtm; struct sockaddr_inarp *sin2; struct sockaddr_dl *sdl; char ifname[IF_NAMESIZE]; int st, found_entry = 0; mib[0] = CTL_NET; mib[1] = PF_ROUTE; mib[2] = 0; mib[3] = AF_INET; mib[4] = NET_RT_FLAGS; mib[5] = RTF_LLINFO; if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) err(1, "route-sysctl-estimate"); if (needed == 0) /* empty table */ return 0; buf = NULL; for (;;) { newbuf = realloc(buf, needed); if (newbuf == NULL) { if (buf != NULL) free(buf); errx(1, "could not reallocate memory"); } buf = newbuf; st = sysctl(mib, 6, buf, &needed, NULL, 0); if (st == 0 || errno != ENOMEM) break; needed += needed / 8; } if (st == -1) err(1, "actual retrieval of routing table"); lim = buf + needed; for (next = buf; next < lim; next += rtm->rtm_msglen) { rtm = (struct rt_msghdr *)next; sin2 = (struct sockaddr_inarp *)(rtm + 1); sdl = (struct sockaddr_dl *)((char *)sin2 + SA_SIZE(sin2)); if (rifname && if_indextoname(sdl->sdl_index, ifname) && strcmp(ifname, rifname)) continue; if (addr) { if (addr != sin2->sin_addr.s_addr) continue; found_entry = 1; } (*action)(sdl, sin2, rtm); } free(buf); return (found_entry); } /* * Stolen and adapted from ifconfig */ static char * print_lladdr(struct sockaddr_dl *sdl) { static char buf[256]; char *cp; int n, bufsize = sizeof (buf), p = 0; bzero(buf, sizeof (buf)); cp = (char *)LLADDR(sdl); if ((n = sdl->sdl_alen) > 0) { while (--n >= 0) p += snprintf(buf + p, bufsize - p, "%x%s", *cp++ & 0xff, n > 0 ? ":" : ""); } return (buf); } /* * Display an arp entry */ static void print_entry(struct sockaddr_dl *sdl, struct sockaddr_inarp *addr, struct rt_msghdr *rtm) { const char *host; struct hostent *hp; char ifname[IF_NAMESIZE]; #if 0 struct iso88025_sockaddr_dl_data *trld; int seg; #endif if (nflag == 0) hp = gethostbyaddr((caddr_t)&(addr->sin_addr), sizeof addr->sin_addr, AF_INET); else hp = 0; if (hp) host = hp->h_name; else { host = "?"; if (h_errno == TRY_AGAIN) nflag = 1; } printf("%s (%s) at ", host, inet_ntoa(addr->sin_addr)); if (sdl->sdl_alen) { #if 1 printf("%s", print_lladdr(sdl)); #else if ((sdl->sdl_type == IFT_ETHER || sdl->sdl_type == IFT_L2VLAN || sdl->sdl_type == IFT_BRIDGE) && sdl->sdl_alen == ETHER_ADDR_LEN) printf("%s", ether_ntoa((struct ether_addr *)LLADDR(sdl))); else { int n = sdl->sdl_nlen > 0 ? sdl->sdl_nlen + 1 : 0; printf("%s", link_ntoa(sdl) + n); } #endif } else printf("(incomplete)"); if (if_indextoname(sdl->sdl_index, ifname) != NULL) printf(" on %s", ifname); if ((rtm->rtm_flags & RTF_IFSCOPE)) printf(" ifscope"); if (rtm->rtm_rmx.rmx_expire == 0) printf(" permanent"); if (addr->sin_other & SIN_PROXY) printf(" published (proxy only)"); if (rtm->rtm_addrs & RTA_NETMASK) { addr = (struct sockaddr_inarp *) (SA_SIZE(sdl) + (char *)sdl); if (addr->sin_addr.s_addr == 0xffffffff) printf(" published"); if (addr->sin_len != 8) printf("(weird)"); } switch(sdl->sdl_type) { case IFT_ETHER: printf(" [ethernet]"); break; #if 0 case IFT_ISO88025: printf(" [token-ring]"); trld = SDL_ISO88025(sdl); if (trld->trld_rcf != 0) { printf(" rt=%x", ntohs(trld->trld_rcf)); for (seg = 0; seg < ((TR_RCF_RIFLEN(trld->trld_rcf) - 2 ) / 2); seg++) printf(":%x", ntohs(*(trld->trld_route[seg]))); } break; #endif case IFT_FDDI: printf(" [fddi]"); break; case IFT_ATM: printf(" [atm]"); break; case IFT_L2VLAN: printf(" [vlan]"); break; case IFT_IEEE1394: printf(" [firewire]"); break; #ifdef IFT_BRIDGE case IFT_BRIDGE: printf(" [bridge]"); break; #endif default: break; } printf("\n"); } /* * Nuke an arp entry */ static void nuke_entry(struct sockaddr_dl *sdl __unused, struct sockaddr_inarp *addr, struct rt_msghdr *rtm) { char ip[20]; snprintf(ip, sizeof(ip), "%s", inet_ntoa(addr->sin_addr)); /* * When deleting all entries, specify the interface scope of each entry */ if ((rtm->rtm_flags & RTF_IFSCOPE)) ifscope = rtm->rtm_index; (void)delete(ip, 0); ifscope = 0; } static void usage(void) { fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n", "usage: arp [-n] [-i interface] hostname", " arp [-n] [-i interface] [-l] -a", " arp -d hostname [pub] [ifscope interface]", " arp -d [-i interface] -a", " arp -s hostname ether_addr [temp] [reject] [blackhole] [pub [only]] [ifscope interface]", " arp -S hostname ether_addr [temp] [reject] [blackhole] [pub [only]] [ifscope interface]", " arp -f filename"); exit(1); } static struct rt_msghdr * rtmsg(int cmd, struct sockaddr_inarp *dst, struct sockaddr_dl *sdl) { static int seq; int rlen; int l; struct sockaddr_in so_mask, *so_mask_ptr = &so_mask; static int s = -1; static pid_t pid; static struct { struct rt_msghdr m_rtm; char m_space[512]; } m_rtmsg; struct rt_msghdr *rtm = &m_rtmsg.m_rtm; char *cp = m_rtmsg.m_space; if (s < 0) { /* first time: open socket, get pid */ s = socket(PF_ROUTE, SOCK_RAW, 0); if (s < 0) err(1, "socket"); pid = getpid(); } bzero(&so_mask, sizeof(so_mask)); so_mask.sin_len = 8; so_mask.sin_addr.s_addr = 0xffffffff; errno = 0; /* * XXX RTM_DELETE relies on a previous RTM_GET to fill the buffer * appropriately (except for the mask set just above). */ if (cmd == RTM_DELETE) goto doit; bzero((char *)&m_rtmsg, sizeof(m_rtmsg)); rtm->rtm_flags = flags; rtm->rtm_version = RTM_VERSION; /* * Note: On RTM_GET the kernel will return a scoped route when both a scoped route and * a unscoped route exist. That means we cannot delete a unscoped route if there is * also a matching scope route */ if (ifscope) { rtm->rtm_index = ifscope; rtm->rtm_flags |= RTF_IFSCOPE; } switch (cmd) { default: errx(1, "internal wrong cmd"); case RTM_ADD: rtm->rtm_addrs |= RTA_GATEWAY; rtm->rtm_rmx.rmx_expire = expire_time; rtm->rtm_inits = RTV_EXPIRE; rtm->rtm_flags |= (RTF_HOST | RTF_STATIC); dst->sin_other = 0; if (doing_proxy) { if (proxy_only) dst->sin_other = SIN_PROXY; else { rtm->rtm_addrs |= RTA_NETMASK; rtm->rtm_flags &= ~RTF_HOST; } } /* FALLTHROUGH */ case RTM_GET: rtm->rtm_addrs |= RTA_DST; } #define NEXTADDR(w, s) \ if ((s) != NULL && rtm->rtm_addrs & (w)) { \ bcopy((s), cp, sizeof(*(s))); cp += SA_SIZE(s);} NEXTADDR(RTA_DST, dst); NEXTADDR(RTA_GATEWAY, sdl); NEXTADDR(RTA_NETMASK, so_mask_ptr); rtm->rtm_msglen = cp - (char *)&m_rtmsg; doit: l = rtm->rtm_msglen; rtm->rtm_seq = ++seq; rtm->rtm_type = cmd; if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) { if (errno != ESRCH || cmd != RTM_DELETE) { warn("writing to routing socket"); return (NULL); } } do { l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg)); } while (l > 0 && (rtm->rtm_seq != seq || rtm->rtm_pid != pid)); if (l < 0) warn("read from routing socket"); return (rtm); } /* * get_ether_addr - get the hardware address of an interface on the * the same subnet as ipaddr. */ #define MAX_IFS 32 static int get_ether_addr(in_addr_t ipaddr, struct ether_addr *hwaddr) { struct ifreq *ifr, *ifend, *ifp; in_addr_t ina, mask; struct sockaddr_dl *dla; struct ifreq ifreq; struct ifconf ifc; struct ifreq ifs[MAX_IFS]; int sock; int retval = 0; sock = socket(AF_INET, SOCK_DGRAM, 0); if (sock < 0) err(1, "socket"); ifc.ifc_len = sizeof(ifs); ifc.ifc_req = ifs; if (ioctl(sock, SIOCGIFCONF, &ifc) < 0) { warnx("ioctl(SIOCGIFCONF)"); goto done; } #define NEXTIFR(i) \ ((struct ifreq *)((char *)&(i)->ifr_addr \ + MAX((i)->ifr_addr.sa_len, sizeof((i)->ifr_addr))) ) /* * Scan through looking for an interface with an Internet * address on the same subnet as `ipaddr'. */ ifend = (struct ifreq *)(ifc.ifc_buf + ifc.ifc_len); for (ifr = ifc.ifc_req; ifr < ifend; ifr = NEXTIFR(ifr) ) { if (ifr->ifr_addr.sa_family != AF_INET) continue; strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name)); ifreq.ifr_addr = ifr->ifr_addr; /* * Check that the interface is up, * and not point-to-point or loopback. */ if (ioctl(sock, SIOCGIFFLAGS, &ifreq) < 0) continue; if ((ifreq.ifr_flags & (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT| IFF_LOOPBACK|IFF_NOARP)) != (IFF_UP|IFF_BROADCAST)) continue; /* * Get its netmask and check that it's on * the right subnet. */ if (ioctl(sock, SIOCGIFNETMASK, &ifreq) < 0) continue; mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr; ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr; if ((ipaddr & mask) == (ina & mask)) break; /* ok, we got it! */ } if (ifr >= ifend) goto done; /* * Now scan through again looking for a link-level address * for this interface. */ ifp = ifr; for (ifr = ifc.ifc_req; ifr < ifend; ifr = NEXTIFR(ifr)) if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0 && ifr->ifr_addr.sa_family == AF_LINK) break; if (ifr >= ifend) goto done; /* * Found the link-level address - copy it out */ dla = (struct sockaddr_dl *) &ifr->ifr_addr; memcpy(hwaddr, LLADDR(dla), dla->sdl_alen); printf("using interface %s for proxy with address ", ifp->ifr_name); printf("%s\n", ether_ntoa(hwaddr)); retval = dla->sdl_alen; done: close(sock); return (retval); } static char * sec2str(total) time_t total; { static char result[256]; int days, hours, mins, secs; int first = 1; char *p = result; days = total / 3600 / 24; hours = (total / 3600) % 24; mins = (total / 60) % 60; secs = total % 60; if (days) { first = 0; p += snprintf(p, sizeof(result) - (p - result), "%dd", days); } if (!first || hours) { first = 0; p += snprintf(p, sizeof(result) - (p - result), "%dh", hours); } if (!first || mins) { first = 0; p += snprintf(p, sizeof(result) - (p - result), "%dm", mins); } snprintf(p, sizeof(result) - (p - result), "%ds", secs); return(result); } static int search_ext(in_addr_t addr, action_ext_fn *action) { int mib[6]; size_t needed; char *lim, *buf, *newbuf, *next; struct rt_msghdr_ext *ertm; struct sockaddr_inarp *sin2; struct sockaddr_dl *sdl; char ifname[IF_NAMESIZE]; int st, found_entry = 0; mib[0] = CTL_NET; mib[1] = PF_ROUTE; mib[2] = 0; mib[3] = AF_INET; mib[4] = NET_RT_DUMPX_FLAGS; mib[5] = RTF_LLINFO; if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) err(1, "route-sysctl-estimate"); if (needed == 0) /* empty table */ return 0; buf = NULL; for (;;) { newbuf = realloc(buf, needed); if (newbuf == NULL) { if (buf != NULL) free(buf); errx(1, "could not reallocate memory"); } buf = newbuf; st = sysctl(mib, 6, buf, &needed, NULL, 0); if (st == 0 || errno != ENOMEM) break; needed += needed / 8; } if (st == -1) err(1, "actual retrieval of routing table"); lim = buf + needed; for (next = buf; next < lim; next += ertm->rtm_msglen) { ertm = (struct rt_msghdr_ext *)next; sin2 = (struct sockaddr_inarp *)(ertm + 1); sdl = (struct sockaddr_dl *)((char *)sin2 + SA_SIZE(sin2)); if (rifname && if_indextoname(sdl->sdl_index, ifname) && strcmp(ifname, rifname)) continue; if (addr) { if (addr != sin2->sin_addr.s_addr) continue; found_entry = 1; } (*action)(sdl, sin2, ertm); } free(buf); return (found_entry); } static void print_entry_ext(struct sockaddr_dl *sdl, struct sockaddr_inarp *addr, struct rt_msghdr_ext *ertm) { const char *host; struct hostent *hp; char ifname[IF_NAMESIZE]; struct timeval time; if (nflag == 0) hp = gethostbyaddr((caddr_t)&(addr->sin_addr), sizeof (addr->sin_addr), AF_INET); else hp = 0; if (hp) host = hp->h_name; else host = inet_ntoa(addr->sin_addr); printf("%-23s ", host); if (sdl->sdl_alen) printf("%-17s ", print_lladdr(sdl)); else printf("%-17s ", "(incomplete)"); gettimeofday(&time, 0); if (ertm->rtm_ri.ri_refcnt == 0 || ertm->rtm_ri.ri_snd_expire == 0) printf("%-9.9s ", "(none)"); else if (ertm->rtm_ri.ri_snd_expire > time.tv_sec) printf("%-9.9s ", sec2str(ertm->rtm_ri.ri_snd_expire - time.tv_sec)); else printf("%-9.9s ", "expired"); if (ertm->rtm_ri.ri_refcnt == 0 || ertm->rtm_ri.ri_rcv_expire == 0) printf("%-9.9s", "(none)"); else if (ertm->rtm_ri.ri_rcv_expire > time.tv_sec) printf("%-9.9s", sec2str(ertm->rtm_ri.ri_rcv_expire - time.tv_sec)); else printf("%-9.9s", "expired"); if (if_indextoname(sdl->sdl_index, ifname) == NULL) snprintf(ifname, sizeof (ifname), "%s", "?"); printf(" %8.8s", ifname); if (ertm->rtm_ri.ri_refcnt) { printf(" %4d", ertm->rtm_ri.ri_refcnt); if (ertm->rtm_ri.ri_probes) printf(" %4d", ertm->rtm_ri.ri_probes); if (xflag) { if (!ertm->rtm_ri.ri_probes) printf(" %-4.4s", "none"); if (ertm->rtm_ri.ri_rssi != IFNET_RSSI_UNKNOWN) printf(" %7d", ertm->rtm_ri.ri_rssi); else printf(" %-7.7s", "unknown"); switch (ertm->rtm_ri.ri_lqm) { case IFNET_LQM_THRESH_OFF: printf(" %-7.7s", "off"); break; case IFNET_LQM_THRESH_UNKNOWN: printf(" %-7.7s", "unknown"); break; case IFNET_LQM_THRESH_POOR: printf(" %-7.7s", "poor"); break; case IFNET_LQM_THRESH_GOOD: printf(" %-7.7s", "good"); break; default: printf(" %7d", ertm->rtm_ri.ri_lqm); break; } switch (ertm->rtm_ri.ri_npm) { case IFNET_NPM_THRESH_UNKNOWN: printf(" %-7.7s", "unknown"); break; case IFNET_NPM_THRESH_NEAR: printf(" %-7.7s", "near"); break; case IFNET_NPM_THRESH_GENERAL: printf(" %-7.7s", "general"); break; case IFNET_NPM_THRESH_FAR: printf(" %-7.7s", "far"); break; default: printf(" %7d", ertm->rtm_ri.ri_npm); break; } } } printf("\n"); }