/* $OpenBSD: ndp.c,v 1.98 2019/08/31 13:46:14 bluhm Exp $ */ /* $KAME: ndp.c,v 1.101 2002/07/17 08:46:33 itojun Exp $ */ /* * Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project. * All rights reserved. * * 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. * 3. Neither the name of the project 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 PROJECT 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 PROJECT 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. */ /* * 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. * 3. 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. */ /* * Based on: * "@(#) Copyright (c) 1984, 1993\n\ * The Regents of the University of California. All rights reserved.\n"; * * "@(#)arp.c 8.2 (Berkeley) 1/2/94"; */ /* * ndp - display, set, delete and flush neighbor cache */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "gmt2local.h" /* packing rule for routing socket */ #define ROUNDUP(a) \ ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) static pid_t pid; static int nflag; static int tflag; static int32_t thiszone; /* time difference with gmt */ static int rtsock = -1; static int repeat = 0; char host_buf[NI_MAXHOST]; /* getnameinfo() */ char ifix_buf[IFNAMSIZ]; /* if_indextoname() */ int file(char *); void getsocket(void); int parse_host(const char *, struct in6_addr *); int set(int, char **); void get(const char *); int delete(const char *); void dump(struct in6_addr *, int); static struct in6_nbrinfo *getnbrinfo(struct in6_addr *, int, int); static char *ether_str(struct sockaddr_dl *); int ndp_ether_aton(const char *, u_char *); void usage(void); int rtmsg(int); int rtget(struct sockaddr_in6 **, struct sockaddr_dl **); void ifinfo(const char *); static char *sec2str(time_t); static void ts_print(const struct timeval *); static int rdomain; int main(int argc, char *argv[]) { int ch; int mode = 0; char *arg = NULL; const char *errstr; pid = getpid(); thiszone = gmt2local(0); rdomain = getrtable(); while ((ch = getopt(argc, argv, "acd:f:i:nstA:V:")) != -1) { switch (ch) { case 'a': case 'c': case 'p': case 'r': case 'P': case 's': if (mode) { usage(); } mode = ch; arg = NULL; break; case 'd': case 'f': case 'i' : if (mode) { usage(); } mode = ch; arg = optarg; break; case 'n': nflag = 1; break; case 't': tflag = 1; break; case 'A': if (mode) { usage(); } mode = 'a'; repeat = strtonum(optarg, 1, INT_MAX, &errstr); if (errstr) { usage(); } break; case 'V': rdomain = strtonum(optarg, 0, RT_TABLEID_MAX, &errstr); if (errstr != NULL) { warn("bad rdomain: %s", errstr); usage(); } break; default: usage(); } } argc -= optind; argv += optind; switch (mode) { case 'a': case 'c': if (argc != 0) { usage(); } dump(0, mode == 'c'); break; case 'd': if (argc != 0) { usage(); } delete(arg); break; case 'f': if (argc != 0) usage(); file(arg); break; case 'i': if (argc != 0) usage(); ifinfo(arg); break; case 's': if (argc < 2 || argc > 4) usage(); exit(set(argc, argv) ? 1 : 0); case 0: if (argc != 1) { usage(); } get(argv[0]); break; } exit(0); } /* * Process a file to set standard ndp entries */ int file(char *name) { FILE *fp; int i, retval; char line[100], arg[5][50], *args[5]; 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]; retval = 0; while (fgets(line, sizeof(line), fp) != NULL) { i = sscanf(line, "%49s %49s %49s %49s %49s", arg[0], arg[1], arg[2], arg[3], arg[4]); if (i < 2) { warnx("bad line: %s", line); retval = 1; continue; } if (set(i, args)) retval = 1; } fclose(fp); return (retval); } void getsocket(void) { socklen_t len = sizeof(rdomain); if (rtsock >= 0) return; rtsock = socket(AF_ROUTE, SOCK_RAW, 0); if (rtsock == -1) err(1, "routing socket"); if (setsockopt(rtsock, AF_ROUTE, ROUTE_TABLEFILTER, &rdomain, len) == -1) err(1, "ROUTE_TABLEFILTER"); if (pledge("stdio dns", NULL) == -1) err(1, "pledge"); } int parse_host(const char *host, struct in6_addr *in6) { struct addrinfo hints, *res; struct sockaddr_in6 *sin6; int gai_error; bzero(&hints, sizeof(hints)); hints.ai_family = AF_INET6; if (nflag) hints.ai_flags = AI_NUMERICHOST; gai_error = getaddrinfo(host, NULL, &hints, &res); if (gai_error) { warnx("%s: %s", host, gai_strerror(gai_error)); return 1; } sin6 = (struct sockaddr_in6 *)res->ai_addr; *in6 = sin6->sin6_addr; #ifdef __KAME__ if (IN6_IS_ADDR_LINKLOCAL(in6)) { in6->s6_addr[2] = htons(sin6->sin6_scope_id); } #endif freeaddrinfo(res); return 0; } struct sockaddr_in6 so_mask = {sizeof(so_mask), AF_INET6 }; struct sockaddr_in6 blank_sin = {sizeof(blank_sin), AF_INET6 }, sin_m; struct sockaddr_dl blank_sdl = {sizeof(blank_sdl), AF_LINK }, sdl_m; struct sockaddr_dl ifp_m = { sizeof(ifp_m), AF_LINK }; time_t expire_time; int flags, found_entry; struct { struct rt_msghdr m_rtm; char m_space[512]; } m_rtmsg; /* * Set an individual neighbor cache entry */ int set(int argc, char *argv[]) { struct sockaddr_in6 *sin = &sin_m; struct sockaddr_dl *sdl; struct rt_msghdr *rtm = &(m_rtmsg.m_rtm); u_char *ea; const char *host = argv[0], *eaddr = argv[1]; getsocket(); argc -= 2; argv += 2; sdl_m = blank_sdl; sin_m = blank_sin; if (parse_host(host, &sin->sin6_addr)) return 1; ea = (u_char *)LLADDR(&sdl_m); if (ndp_ether_aton(eaddr, ea) == 0) sdl_m.sdl_alen = 6; expire_time = 0; flags = 0; while (argc-- > 0) { if (strncmp(argv[0], "temp", 4) == 0) { struct timeval now; gettimeofday(&now, 0); expire_time = now.tv_sec + 20 * 60; } else if (strncmp(argv[0], "proxy", 5) == 0) flags |= RTF_ANNOUNCE; argv++; } if (rtget(&sin, &sdl)) { errx(1, "RTM_GET(%s) failed", host); } if (IN6_ARE_ADDR_EQUAL(&sin->sin6_addr, &sin_m.sin6_addr)) { if (sdl->sdl_family == AF_LINK && (rtm->rtm_flags & RTF_LLINFO) && !(rtm->rtm_flags & RTF_GATEWAY)) { switch (sdl->sdl_type) { case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023: case IFT_ISO88024: case IFT_ISO88025: goto overwrite; } } /* * IPv4 arp command retries with sin_other = SIN_PROXY here. */ warnx("set: cannot configure a new entry"); return 1; } overwrite: 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)); } /* * Display an individual neighbor cache entry */ void get(const char *host) { struct sockaddr_in6 *sin = &sin_m; sin_m = blank_sin; if (parse_host(host, &sin->sin6_addr)) return; dump(&sin->sin6_addr, 0); if (found_entry == 0) { getnameinfo((struct sockaddr *)sin, sin->sin6_len, host_buf, sizeof(host_buf), NULL ,0, (nflag ? NI_NUMERICHOST : 0)); printf("%s (%s) -- no entry\n", host, host_buf); exit(1); } } /* * Delete a neighbor cache entry */ int delete(const char *host) { struct sockaddr_in6 *sin = &sin_m; struct rt_msghdr *rtm = &m_rtmsg.m_rtm; struct sockaddr_dl *sdl; getsocket(); sin_m = blank_sin; if (parse_host(host, &sin->sin6_addr)) return 1; if (rtget(&sin, &sdl)) { errx(1, "RTM_GET(%s) failed", host); } if (IN6_ARE_ADDR_EQUAL(&sin->sin6_addr, &sin_m.sin6_addr)) { if (sdl->sdl_family == AF_LINK && rtm->rtm_flags & RTF_LLINFO) { if (rtm->rtm_flags & RTF_LOCAL) return (0); if (!(rtm->rtm_flags & RTF_GATEWAY)) goto delete; } /* * IPv4 arp command retries with sin_other = SIN_PROXY here. */ warnx("delete: cannot delete non-NDP entry"); return 1; } delete: if (sdl->sdl_family != AF_LINK) { printf("cannot locate %s\n", host); return (1); } if (rtmsg(RTM_DELETE) == 0) { struct sockaddr_in6 s6 = *sin; /* XXX: for safety */ #ifdef __KAME__ if (IN6_IS_ADDR_LINKLOCAL(&s6.sin6_addr)) { s6.sin6_scope_id = ntohs(*(u_int16_t *)&s6.sin6_addr.s6_addr[2]); *(u_int16_t *)&s6.sin6_addr.s6_addr[2] = 0; } #endif getnameinfo((struct sockaddr *)&s6, s6.sin6_len, host_buf, sizeof(host_buf), NULL, 0, (nflag ? NI_NUMERICHOST : 0)); printf("%s (%s) deleted\n", host, host_buf); } return 0; } #define W_ADDR 36 #define W_LL 17 #define W_IF 7 /* * Dump the entire neighbor cache */ void dump(struct in6_addr *addr, int cflag) { int mib[7]; size_t needed; char *lim, *buf = NULL, *next; struct rt_msghdr *rtm; struct sockaddr_in6 *sin; struct sockaddr_dl *sdl; struct in6_nbrinfo *nbi; struct timeval now; int addrwidth; int llwidth; int ifwidth; char *ifname; /* Print header */ if (!tflag && !cflag) printf("%-*.*s %-*.*s %*.*s %-9.9s %1s %5s\n", W_ADDR, W_ADDR, "Neighbor", W_LL, W_LL, "Linklayer Address", W_IF, W_IF, "Netif", "Expire", "S", "Flags"); again:; lim = NULL; mib[0] = CTL_NET; mib[1] = PF_ROUTE; mib[2] = 0; mib[3] = AF_INET6; mib[4] = NET_RT_FLAGS; mib[5] = RTF_LLINFO; mib[6] = rdomain; while (1) { if (sysctl(mib, 7, NULL, &needed, NULL, 0) == -1) err(1, "sysctl(PF_ROUTE estimate)"); if (needed == 0) break; if ((buf = realloc(buf, needed)) == NULL) err(1, "realloc"); if (sysctl(mib, 7, buf, &needed, NULL, 0) == -1) { if (errno == ENOMEM) continue; err(1, "sysctl(PF_ROUTE, NET_RT_FLAGS)"); } lim = buf + needed; break; } for (next = buf; next && lim && next < lim; next += rtm->rtm_msglen) { int isrouter = 0, prbs = 0; rtm = (struct rt_msghdr *)next; if (rtm->rtm_version != RTM_VERSION) continue; sin = (struct sockaddr_in6 *)(next + rtm->rtm_hdrlen); sdl = (struct sockaddr_dl *)((char *)sin + ROUNDUP(sin->sin6_len)); /* * Some OSes can produce a route that has the LINK flag but * has a non-AF_LINK gateway (e.g. fe80::xx%lo0 on FreeBSD * and BSD/OS, where xx is not the interface identifier on * lo0). Such routes entry would annoy getnbrinfo() below, * so we skip them. * XXX: such routes should have the GATEWAY flag, not the * LINK flag. However, there is rotten routing software * that advertises all routes that have the GATEWAY flag. * Thus, KAME kernel intentionally does not set the LINK flag. * What is to be fixed is not ndp, but such routing software * (and the kernel workaround)... */ if (sdl->sdl_family != AF_LINK) continue; if (!(rtm->rtm_flags & RTF_HOST)) continue; if (addr) { if (!IN6_ARE_ADDR_EQUAL(addr, &sin->sin6_addr)) continue; found_entry = 1; } else if (IN6_IS_ADDR_MULTICAST(&sin->sin6_addr)) continue; if (IN6_IS_ADDR_LINKLOCAL(&sin->sin6_addr) || IN6_IS_ADDR_MC_LINKLOCAL(&sin->sin6_addr)) { /* XXX: should scope id be filled in the kernel? */ if (sin->sin6_scope_id == 0) sin->sin6_scope_id = sdl->sdl_index; #ifdef __KAME__ /* KAME specific hack; removed the embedded id */ *(u_int16_t *)&sin->sin6_addr.s6_addr[2] = 0; #endif } getnameinfo((struct sockaddr *)sin, sin->sin6_len, host_buf, sizeof(host_buf), NULL, 0, (nflag ? NI_NUMERICHOST : 0)); if (cflag) { if (rtm->rtm_flags & RTF_CLONED) delete(host_buf); continue; } gettimeofday(&now, 0); if (tflag) ts_print(&now); addrwidth = strlen(host_buf); if (addrwidth < W_ADDR) addrwidth = W_ADDR; llwidth = strlen(ether_str(sdl)); if (W_ADDR + W_LL - addrwidth > llwidth) llwidth = W_ADDR + W_LL - addrwidth; ifname = if_indextoname(sdl->sdl_index, ifix_buf); if (!ifname) ifname = "?"; ifwidth = strlen(ifname); if (W_ADDR + W_LL + W_IF - addrwidth - llwidth > ifwidth) ifwidth = W_ADDR + W_LL + W_IF - addrwidth - llwidth; printf("%-*.*s %-*.*s %*.*s", addrwidth, addrwidth, host_buf, llwidth, llwidth, ether_str(sdl), ifwidth, ifwidth, ifname); /* Print neighbor discovery specific informations */ nbi = getnbrinfo(&sin->sin6_addr, sdl->sdl_index, 1); if (nbi) { if (nbi->expire > now.tv_sec) { printf(" %-9.9s", sec2str(nbi->expire - now.tv_sec)); } else if (nbi->expire == 0) printf(" %-9.9s", "permanent"); else printf(" %-9.9s", "expired"); switch (nbi->state) { case ND6_LLINFO_NOSTATE: printf(" N"); break; case ND6_LLINFO_INCOMPLETE: printf(" I"); break; case ND6_LLINFO_REACHABLE: printf(" R"); break; case ND6_LLINFO_STALE: printf(" S"); break; case ND6_LLINFO_DELAY: printf(" D"); break; case ND6_LLINFO_PROBE: printf(" P"); break; default: printf(" ?"); break; } isrouter = nbi->isrouter; prbs = nbi->asked; } else { warnx("failed to get neighbor information"); printf(" "); } printf(" %s%s%s", (rtm->rtm_flags & RTF_LOCAL) ? "l" : "", isrouter ? "R" : "", (rtm->rtm_flags & RTF_ANNOUNCE) ? "p" : ""); if (prbs) printf(" %d", prbs); printf("\n"); } if (repeat) { printf("\n"); fflush(stdout); sleep(repeat); goto again; } free(buf); } static struct in6_nbrinfo * getnbrinfo(struct in6_addr *addr, int ifindex, int warning) { static struct in6_nbrinfo nbi; int s; if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) == -1) err(1, "socket"); bzero(&nbi, sizeof(nbi)); if_indextoname(ifindex, nbi.ifname); nbi.addr = *addr; if (ioctl(s, SIOCGNBRINFO_IN6, (caddr_t)&nbi) == -1) { if (warning) warn("ioctl(SIOCGNBRINFO_IN6)"); close(s); return(NULL); } close(s); return(&nbi); } static char * ether_str(struct sockaddr_dl *sdl) { static char hbuf[NI_MAXHOST]; u_char *cp; if (sdl->sdl_alen) { cp = (u_char *)LLADDR(sdl); snprintf(hbuf, sizeof(hbuf), "%02x:%02x:%02x:%02x:%02x:%02x", cp[0], cp[1], cp[2], cp[3], cp[4], cp[5]); } else snprintf(hbuf, sizeof(hbuf), "(incomplete)"); return(hbuf); } int ndp_ether_aton(const char *a, u_char *n) { int i, o[6]; i = sscanf(a, "%x:%x:%x:%x:%x:%x", &o[0], &o[1], &o[2], &o[3], &o[4], &o[5]); if (i != 6) { warnx("invalid Ethernet address '%s'", a); return (1); } for (i = 0; i < 6; i++) n[i] = o[i]; return (0); } void usage(void) { printf("usage: ndp [-acnt] "); printf("[-A wait] [-d hostname] [-f filename] [-i interface]\n"); printf("\t[-s nodename ether_addr [temp] [proxy]] "); printf("[-V rdomain] [hostname]\n"); exit(1); } int rtmsg(int cmd) { static int seq; int rlen; struct rt_msghdr *rtm = &m_rtmsg.m_rtm; char *cp = m_rtmsg.m_space; int l; errno = 0; if (cmd == RTM_DELETE) goto doit; bzero((char *)&m_rtmsg, sizeof(m_rtmsg)); rtm->rtm_flags = flags; rtm->rtm_version = RTM_VERSION; rtm->rtm_tableid = rdomain; switch (cmd) { default: errx(1, "internal wrong cmd"); case RTM_ADD: rtm->rtm_addrs |= RTA_GATEWAY; if (expire_time) { rtm->rtm_rmx.rmx_expire = expire_time; rtm->rtm_inits = RTV_EXPIRE; } rtm->rtm_flags |= (RTF_HOST | RTF_STATIC); #if 0 /* we don't support ipv6addr/128 type proxying. */ if (rtm->rtm_flags & RTF_ANNOUNCE) { rtm->rtm_flags &= ~RTF_HOST; rtm->rtm_addrs |= RTA_NETMASK; } #endif /* FALLTHROUGH */ case RTM_GET: rtm->rtm_addrs |= (RTA_DST | RTA_IFP); } #define NEXTADDR(w, s) \ if (rtm->rtm_addrs & (w)) { \ memcpy(cp, &(s), sizeof(s)); \ ADVANCE(cp, (struct sockaddr *)&(s)); \ } NEXTADDR(RTA_DST, sin_m); NEXTADDR(RTA_GATEWAY, sdl_m); #if 0 /* we don't support ipv6addr/128 type proxying. */ memset(&so_mask.sin6_addr, 0xff, sizeof(so_mask.sin6_addr)); NEXTADDR(RTA_NETMASK, so_mask); #endif NEXTADDR(RTA_IFP, ifp_m); rtm->rtm_msglen = cp - (char *)&m_rtmsg; doit: l = rtm->rtm_msglen; rtm->rtm_seq = ++seq; rtm->rtm_type = cmd; if ((rlen = write(rtsock, (char *)&m_rtmsg, l)) == -1) { if (errno != ESRCH || cmd != RTM_DELETE) { err(1, "writing to routing socket"); } } do { l = read(rtsock, (char *)&m_rtmsg, sizeof(m_rtmsg)); } while (l > 0 && (rtm->rtm_version != RTM_VERSION || rtm->rtm_seq != seq || rtm->rtm_pid != pid)); if (l == -1) warn("read from routing socket"); return (0); } int rtget(struct sockaddr_in6 **sinp, struct sockaddr_dl **sdlp) { struct rt_msghdr *rtm = &(m_rtmsg.m_rtm); struct sockaddr_in6 *sin = NULL; struct sockaddr_dl *sdl = NULL; struct sockaddr *sa; char *cp; unsigned int i; if (rtmsg(RTM_GET) < 0) return (1); if (rtm->rtm_addrs) { cp = ((char *)rtm + rtm->rtm_hdrlen); for (i = 1; i; i <<= 1) { if (i & rtm->rtm_addrs) { sa = (struct sockaddr *)cp; switch (i) { case RTA_DST: sin = (struct sockaddr_in6 *)sa; break; case RTA_IFP: sdl = (struct sockaddr_dl *)sa; break; default: break; } ADVANCE(cp, sa); } } } if (sin == NULL || sdl == NULL) return (1); *sinp = sin; *sdlp = sdl; return (0); } void ifinfo(const char *ifname) { struct in6_ndireq nd; int s; if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) == -1) { err(1, "socket"); } bzero(&nd, sizeof(nd)); strlcpy(nd.ifname, ifname, sizeof(nd.ifname)); if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) == -1) err(1, "ioctl(SIOCGIFINFO_IN6)"); if (!nd.ndi.initialized) errx(1, "%s: not initialized yet", ifname); printf("basereachable=%ds%dms", nd.ndi.basereachable / 1000, nd.ndi.basereachable % 1000); printf(", reachable=%ds", nd.ndi.reachable); printf(", retrans=%ds%dms\n", nd.ndi.retrans / 1000, nd.ndi.retrans % 1000); close(s); } static char * sec2str(time_t total) { static char result[256]; int days, hours, mins, secs; int first = 1; char *p = result; char *ep = &result[sizeof(result)]; int n; days = total / 3600 / 24; hours = (total / 3600) % 24; mins = (total / 60) % 60; secs = total % 60; if (days) { first = 0; n = snprintf(p, ep - p, "%dd", days); if (n < 0 || n >= ep - p) return "?"; p += n; } if (!first || hours) { first = 0; n = snprintf(p, ep - p, "%dh", hours); if (n < 0 || n >= ep - p) return "?"; p += n; } if (!first || mins) { first = 0; n = snprintf(p, ep - p, "%dm", mins); if (n < 0 || n >= ep - p) return "?"; p += n; } snprintf(p, ep - p, "%ds", secs); return(result); } /* * Print the timestamp * from tcpdump/util.c */ static void ts_print(const struct timeval *tvp) { int s; /* Default */ s = (tvp->tv_sec + thiszone) % 86400; (void)printf("%02d:%02d:%02d.%06u ", s / 3600, (s % 3600) / 60, s % 60, (u_int32_t)tvp->tv_usec); }