/* $OpenBSD: route.c,v 1.142 2010/03/23 15:01:50 claudio Exp $ */ /* $NetBSD: route.c,v 1.16 1996/04/15 18:27:05 cgd Exp $ */ /* * Copyright (c) 1983, 1989, 1991, 1993 * The Regents of the University of California. 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 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. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "keywords.h" #include "show.h" const struct if_status_description if_status_descriptions[] = LINK_STATE_DESCRIPTIONS; union sockunion { struct sockaddr sa; struct sockaddr_in sin; struct sockaddr_in6 sin6; struct sockaddr_dl sdl; struct sockaddr_rtlabel rtlabel; struct sockaddr_mpls smpls; } so_dst, so_gate, so_mask, so_genmask, so_ifa, so_ifp, so_label, so_src; typedef union sockunion *sup; pid_t pid; int rtm_addrs, s; int forcehost, forcenet, Fflag, nflag, af, qflag, tflag; int iflag, verbose, aflen = sizeof(struct sockaddr_in); int locking, lockrest, debugonly; u_long mpls_flags = MPLS_OP_LOCAL; u_long rtm_inits; uid_t uid; u_int tableid = 0; struct rt_metrics rt_metrics; void flushroutes(int, char **); int newroute(int, char **); void show(int, char *[]); int keyword(char *); void monitor(int, char *[]); int prefixlen(char *); void sockaddr(char *, struct sockaddr *); void sodump(sup, char *); char *priorityname(u_int8_t); void print_getmsg(struct rt_msghdr *, int); void print_rtmsg(struct rt_msghdr *, int); void pmsg_common(struct rt_msghdr *); void pmsg_addrs(char *, int); void bprintf(FILE *, int, char *); void mask_addr(union sockunion *, union sockunion *, int); int inet6_makenetandmask(struct sockaddr_in6 *); int getaddr(int, char *, struct hostent **); void getmplslabel(char *, int); int rtmsg(int, int, int, u_char); __dead void usage(char *); void set_metric(char *, int); void inet_makenetandmask(u_int32_t, struct sockaddr_in *, int); void interfaces(void); void getlabel(char *); int gettable(const char *); int rdomain(int, int, char **); __dead void usage(char *cp) { extern char *__progname; if (cp) warnx("botched keyword: %s", cp); fprintf(stderr, "usage: %s [-dnqtv] [-T tableid] command [[modifiers] args]\n", __progname); fprintf(stderr, "commands: add, change, delete, exec, flush, get, monitor, show\n"); exit(1); } #define ROUNDUP(a) \ ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) int main(int argc, char **argv) { int ch; int rval = 0; int rtableid = 1; int kw; if (argc < 2) usage(NULL); while ((ch = getopt(argc, argv, "dnqtT:v")) != -1) switch (ch) { case 'n': nflag = 1; break; case 'q': qflag = 1; break; case 'v': verbose = 1; break; case 't': tflag = 1; break; case 'T': rtableid = gettable(optarg); break; case 'd': debugonly = 1; break; default: usage(NULL); /* NOTREACHED */ } argc -= optind; argv += optind; pid = getpid(); uid = geteuid(); if (*argv == NULL) usage(NULL); kw = keyword(*argv); switch (kw) { case K_EXEC: break; case K_MONITOR: monitor(argc, argv); break; default: if (tflag) s = open(_PATH_DEVNULL, O_WRONLY); else s = socket(PF_ROUTE, SOCK_RAW, 0); if (s == -1) err(1, "socket"); break; } switch (kw) { case K_EXEC: rval = rdomain(rtableid, argc - 1, argv + 1); break; case K_GET: uid = 0; /* FALLTHROUGH */ case K_CHANGE: case K_ADD: case K_DELETE: rval = newroute(argc, argv); break; case K_SHOW: uid = 0; show(argc, argv); break; case K_MONITOR: /* handled above */ break; case K_FLUSH: flushroutes(argc, argv); break; default: usage(*argv); /* NOTREACHED */ } exit(rval); } /* * Purge all entries in the routing tables not * associated with network interfaces. */ void flushroutes(int argc, char **argv) { const char *errstr; size_t needed; int mib[7], rlen, seqno; char *buf = NULL, *next, *lim = NULL; struct rt_msghdr *rtm; struct sockaddr *sa; u_char prio = 0; unsigned int ifindex = 0; if (uid) errx(1, "must be root to alter routing table"); shutdown(s, 0); /* Don't want to read back our messages */ while (--argc > 0) { if (**(++argv) == '-') switch (keyword(*argv + 1)) { case K_INET: af = AF_INET; break; case K_INET6: af = AF_INET6; break; case K_LINK: af = AF_LINK; break; case K_MPLS: af = AF_MPLS; break; case K_IFACE: case K_INTERFACE: if (!--argc) usage(1+*argv); ifindex = if_nametoindex(*++argv); if (ifindex == 0) errx(1, "no such interface %s", *argv); break; case K_PRIORITY: if (!--argc) usage(1+*argv); prio = strtonum(*++argv, 0, RTP_MAX, &errstr); if (errstr) errx(1, "priority is %s: %s", errstr, *argv); break; default: usage(*argv); /* NOTREACHED */ } else usage(*argv); } mib[0] = CTL_NET; mib[1] = PF_ROUTE; mib[2] = 0; /* protocol */ mib[3] = 0; /* wildcard address family */ mib[4] = NET_RT_DUMP; mib[5] = 0; /* no flags */ mib[6] = tableid; if (sysctl(mib, 7, NULL, &needed, NULL, 0) < 0) err(1, "route-sysctl-estimate"); if (needed) { if ((buf = malloc(needed)) == NULL) err(1, "malloc"); if (sysctl(mib, 7, buf, &needed, NULL, 0) < 0) err(1, "actual retrieval of routing table"); lim = buf + needed; } if (verbose) { printf("Examining routing table from sysctl\n"); if (af) printf("(address family %s)\n", (*argv + 1)); } if (buf == NULL) return; seqno = 0; for (next = buf; next < lim; next += rtm->rtm_msglen) { rtm = (struct rt_msghdr *)next; if (rtm->rtm_version != RTM_VERSION) continue; if (verbose) print_rtmsg(rtm, rtm->rtm_msglen); if ((rtm->rtm_flags & (RTF_GATEWAY|RTF_STATIC|RTF_LLINFO)) == 0) continue; sa = (struct sockaddr *)(next + rtm->rtm_hdrlen); if (af && sa->sa_family != af) continue; if (ifindex && rtm->rtm_index != ifindex) continue; if (prio && rtm->rtm_priority != prio) continue; if (sa->sa_family == AF_KEY) continue; /* Don't flush SPD */ if (debugonly) continue; rtm->rtm_type = RTM_DELETE; rtm->rtm_seq = seqno; rtm->rtm_tableid = tableid; rlen = write(s, next, rtm->rtm_msglen); if (rlen < (int)rtm->rtm_msglen) { warn("write to routing socket"); printf("got only %d for rlen\n", rlen); break; } seqno++; if (qflag) continue; if (verbose) print_rtmsg(rtm, rlen); else { struct sockaddr *sa = (struct sockaddr *)(next + rtm->rtm_hdrlen); printf("%-20.20s ", rtm->rtm_flags & RTF_HOST ? routename(sa) : netname(sa, NULL)); /* XXX extract netmask */ sa = (struct sockaddr *) (ROUNDUP(sa->sa_len) + (char *)sa); printf("%-20.20s ", routename(sa)); printf("done\n"); } } free(buf); } void set_metric(char *value, int key) { int flag = 0; u_int noval, *valp = &noval; const char *errstr; switch (key) { case K_MTU: valp = &rt_metrics.rmx_mtu; flag = RTV_MTU; break; case K_EXPIRE: valp = &rt_metrics.rmx_expire; flag = RTV_EXPIRE; break; case K_HOPCOUNT: case K_RECVPIPE: case K_SENDPIPE: case K_SSTHRESH: case K_RTT: case K_RTTVAR: /* no longer used, only for compatibility */ return; default: errx(1, "king bula sez: set_metric with invalid key"); } rtm_inits |= flag; if (lockrest || locking) rt_metrics.rmx_locks |= flag; if (locking) locking = 0; *valp = strtonum(value, 0, UINT_MAX, &errstr); if (errstr) errx(1, "set_metric: %s is %s", value, errstr); } int newroute(int argc, char **argv) { const char *errstr; char *cmd, *dest = "", *gateway = "", *error; int ishost = 0, ret = 0, attempts, oerrno, flags = RTF_STATIC; int fmask = 0; int key; u_char prio = 0; struct hostent *hp = NULL; if (uid) errx(1, "must be root to alter routing table"); cmd = argv[0]; if (*cmd != 'g') shutdown(s, 0); /* Don't want to read back our messages */ while (--argc > 0) { if (**(++argv)== '-') { switch (key = keyword(1 + *argv)) { case K_LINK: af = AF_LINK; aflen = sizeof(struct sockaddr_dl); break; case K_INET: af = AF_INET; aflen = sizeof(struct sockaddr_in); break; case K_INET6: af = AF_INET6; aflen = sizeof(struct sockaddr_in6); break; case K_SA: af = PF_ROUTE; aflen = sizeof(union sockunion); break; case K_MPLS: af = AF_MPLS; aflen = sizeof(struct sockaddr_mpls); break; case K_MPLSLABEL: if (!--argc) usage(1+*argv); if (af != AF_INET && af != AF_INET6) errx(1, "-mplslabel requires " "-inet or -inet6"); getmplslabel(*++argv, 0); mpls_flags = MPLS_OP_PUSH; break; case K_IN: if (!--argc) usage(1+*argv); if (af != AF_MPLS) errx(1, "-in requires -mpls"); getmplslabel(*++argv, 1); break; case K_OUT: if (!--argc) usage(1+*argv); if (af != AF_MPLS) errx(1, "-out requires -mpls"); if (mpls_flags == MPLS_OP_LOCAL) errx(1, "-out requires -push, -pop, " "-swap"); getmplslabel(*++argv, 0); break; case K_POP: if (af != AF_MPLS) errx(1, "-pop requires -mpls"); mpls_flags = MPLS_OP_POP; break; case K_PUSH: if (af != AF_MPLS) errx(1, "-push requires -mpls"); mpls_flags = MPLS_OP_PUSH; break; case K_SWAP: if (af != AF_MPLS) errx(1, "-swap requires -mpls"); mpls_flags = MPLS_OP_SWAP; break; case K_IFACE: case K_INTERFACE: iflag++; break; case K_NOSTATIC: flags &= ~RTF_STATIC; break; case K_LLINFO: flags |= RTF_LLINFO; break; case K_LOCK: locking = 1; break; case K_LOCKREST: lockrest = 1; break; case K_HOST: forcehost++; break; case K_REJECT: flags |= RTF_REJECT; break; case K_BLACKHOLE: flags |= RTF_BLACKHOLE; break; case K_PROTO1: flags |= RTF_PROTO1; break; case K_PROTO2: flags |= RTF_PROTO2; break; case K_CLONING: flags |= RTF_CLONING; break; case K_XRESOLVE: flags |= RTF_XRESOLVE; break; case K_STATIC: flags |= RTF_STATIC; break; case K_IFA: if (!--argc) usage(1+*argv); getaddr(RTA_IFA, *++argv, NULL); break; case K_IFP: if (!--argc) usage(1+*argv); getaddr(RTA_IFP, *++argv, NULL); break; case K_GENMASK: if (!--argc) usage(1+*argv); getaddr(RTA_GENMASK, *++argv, NULL); break; case K_GATEWAY: if (!--argc) usage(1+*argv); getaddr(RTA_GATEWAY, *++argv, NULL); gateway = *argv; break; case K_DST: if (!--argc) usage(1+*argv); ishost = getaddr(RTA_DST, *++argv, &hp); dest = *argv; break; case K_LABEL: if (!--argc) usage(1+*argv); getlabel(*++argv); break; case K_NETMASK: if (!--argc) usage(1+*argv); getaddr(RTA_NETMASK, *++argv, NULL); /* FALLTHROUGH */ case K_NET: forcenet++; break; case K_PREFIXLEN: if (!--argc) usage(1+*argv); ishost = prefixlen(*++argv); break; case K_MPATH: flags |= RTF_MPATH; break; case K_JUMBO: flags |= RTF_JUMBO; fmask |= RTF_JUMBO; break; case K_NOJUMBO: flags &= ~RTF_JUMBO; fmask |= RTF_JUMBO; break; case K_MTU: case K_HOPCOUNT: case K_EXPIRE: case K_RECVPIPE: case K_SENDPIPE: case K_SSTHRESH: case K_RTT: case K_RTTVAR: if (!--argc) usage(1+*argv); set_metric(*++argv, key); break; case K_PRIORITY: if (!--argc) usage(1+*argv); prio = strtonum(*++argv, 0, RTP_MAX, &errstr); if (errstr) errx(1, "priority is %s: %s", errstr, *argv); break; default: usage(1+*argv); /* NOTREACHED */ } } else { if ((rtm_addrs & RTA_DST) == 0) { dest = *argv; ishost = getaddr(RTA_DST, *argv, &hp); } else if ((rtm_addrs & RTA_GATEWAY) == 0) { gateway = *argv; getaddr(RTA_GATEWAY, *argv, &hp); } else usage(NULL); } } if (forcehost) ishost = 1; if (forcenet) ishost = 0; if (forcenet && !(rtm_addrs & RTA_NETMASK)) errx(1, "netmask missing"); flags |= RTF_UP; if (ishost) flags |= RTF_HOST; if (iflag == 0) flags |= RTF_GATEWAY; for (attempts = 1; ; attempts++) { errno = 0; if ((ret = rtmsg(*cmd, flags, fmask, prio)) == 0) break; if (errno != ENETUNREACH && errno != ESRCH) break; if (af == AF_INET && *gateway && hp && hp->h_addr_list[1]) { hp->h_addr_list++; memcpy(&so_gate.sin.sin_addr, hp->h_addr_list[0], hp->h_length); } else break; } if (*cmd == 'g') exit(0); oerrno = errno; if (!qflag) { printf("%s %s %s", cmd, ishost ? "host" : "net", dest); if (*gateway) { printf(": gateway %s", gateway); if (attempts > 1 && ret == 0 && af == AF_INET) printf(" (%s)", inet_ntoa(so_gate.sin.sin_addr)); } if (ret == 0) printf("\n"); if (ret != 0) { switch (oerrno) { case ESRCH: error = "not in table"; break; case EBUSY: error = "entry in use"; break; case ENOBUFS: error = "routing table overflow"; break; default: error = strerror(oerrno); break; } printf(": %s\n", error); } } return (ret != 0); } void show(int argc, char *argv[]) { int af = 0; while (--argc > 0) { if (**(++argv)== '-') switch (keyword(*argv + 1)) { case K_INET: af = AF_INET; break; case K_INET6: af = AF_INET6; break; case K_LINK: af = AF_LINK; break; case K_MPLS: af = AF_MPLS; break; case K_ENCAP: af = PF_KEY; break; case K_GATEWAY: Fflag = 1; break; default: usage(*argv); /* NOTREACHED */ } else usage(*argv); } p_rttables(af, tableid); } void inet_makenetandmask(u_int32_t net, struct sockaddr_in *sin, int bits) { u_int32_t addr, mask = 0; char *cp; rtm_addrs |= RTA_NETMASK; if (net == 0) mask = addr = 0; else if (bits) { addr = net; mask = 0xffffffff << (32 - bits); } else if (net < 128) { addr = net << IN_CLASSA_NSHIFT; mask = IN_CLASSA_NET; } else if (net < 65536) { addr = net << IN_CLASSB_NSHIFT; mask = IN_CLASSB_NET; } else if (net < 16777216L) { addr = net << IN_CLASSC_NSHIFT; mask = IN_CLASSC_NET; } else { addr = net; if ((addr & IN_CLASSA_HOST) == 0) mask = IN_CLASSA_NET; else if ((addr & IN_CLASSB_HOST) == 0) mask = IN_CLASSB_NET; else if ((addr & IN_CLASSC_HOST) == 0) mask = IN_CLASSC_NET; else mask = 0xffffffff; } addr &= mask; sin->sin_addr.s_addr = htonl(addr); sin = &so_mask.sin; sin->sin_addr.s_addr = htonl(mask); sin->sin_len = 0; sin->sin_family = 0; cp = (char *)(&sin->sin_addr + 1); while (*--cp == '\0' && cp > (char *)sin) ; sin->sin_len = 1 + cp - (char *)sin; } /* * XXX the function may need more improvement... */ int inet6_makenetandmask(struct sockaddr_in6 *sin6) { char *plen = NULL; struct in6_addr in6; if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) && sin6->sin6_scope_id == 0) { plen = "0"; } else if ((sin6->sin6_addr.s6_addr[0] & 0xe0) == 0x20) { /* aggregatable global unicast - RFC2374 */ memset(&in6, 0, sizeof(in6)); if (!memcmp(&sin6->sin6_addr.s6_addr[8], &in6.s6_addr[8], 8)) plen = "64"; } if (!plen || strcmp(plen, "128") == 0) return (1); else { rtm_addrs |= RTA_NETMASK; prefixlen(plen); return (0); } } /* * Interpret an argument as a network address of some kind, * returning 1 if a host address, 0 if a network address. */ int getaddr(int which, char *s, struct hostent **hpp) { sup su = NULL; struct hostent *hp; struct netent *np; int afamily, bits; if (af == 0) { af = AF_INET; aflen = sizeof(struct sockaddr_in); } afamily = af; /* local copy of af so we can change it */ rtm_addrs |= which; switch (which) { case RTA_DST: su = &so_dst; break; case RTA_GATEWAY: su = &so_gate; break; case RTA_NETMASK: su = &so_mask; break; case RTA_GENMASK: su = &so_genmask; break; case RTA_IFP: su = &so_ifp; afamily = AF_LINK; break; case RTA_IFA: su = &so_ifa; break; default: errx(1, "internal error"); /* NOTREACHED */ } su->sa.sa_len = aflen; su->sa.sa_family = afamily; if (strcmp(s, "default") == 0) { switch (which) { case RTA_DST: forcenet++; getaddr(RTA_NETMASK, s, NULL); break; case RTA_NETMASK: case RTA_GENMASK: su->sa.sa_len = 0; } return (0); } switch (afamily) { case AF_INET6: { struct addrinfo hints, *res; memset(&hints, 0, sizeof(hints)); hints.ai_family = afamily; /*AF_INET6*/ hints.ai_flags = AI_NUMERICHOST; hints.ai_socktype = SOCK_DGRAM; /*dummy*/ if (getaddrinfo(s, "0", &hints, &res) != 0) { hints.ai_flags = 0; if (getaddrinfo(s, "0", &hints, &res) != 0) errx(1, "%s: bad value", s); } if (sizeof(su->sin6) != res->ai_addrlen) errx(1, "%s: bad value", s); if (res->ai_next) errx(1, "%s: resolved to multiple values", s); memcpy(&su->sin6, res->ai_addr, sizeof(su->sin6)); freeaddrinfo(res); if ((IN6_IS_ADDR_LINKLOCAL(&su->sin6.sin6_addr) || IN6_IS_ADDR_MC_LINKLOCAL(&su->sin6.sin6_addr) || IN6_IS_ADDR_MC_INTFACELOCAL(&su->sin6.sin6_addr)) && su->sin6.sin6_scope_id) { *(u_int16_t *)&su->sin6.sin6_addr.s6_addr[2] = htons(su->sin6.sin6_scope_id); su->sin6.sin6_scope_id = 0; } if (hints.ai_flags == AI_NUMERICHOST) { if (which == RTA_DST) return (inet6_makenetandmask(&su->sin6)); return (0); } else return (1); } case AF_LINK: link_addr(s, &su->sdl); return (1); case AF_MPLS: errx(1, "mpls labels require -in or -out switch"); case PF_ROUTE: su->sa.sa_len = sizeof(*su); sockaddr(s, &su->sa); return (1); case AF_INET: if (hpp != NULL) *hpp = NULL; if (which == RTA_DST && !forcehost) { bits = inet_net_pton(AF_INET, s, &su->sin.sin_addr, sizeof(su->sin.sin_addr)); if (bits == 32) return (1); if (bits >= 0) { inet_makenetandmask(ntohl( su->sin.sin_addr.s_addr), &su->sin, bits); return (0); } np = getnetbyname(s); if (np != NULL && np->n_net != 0) { inet_makenetandmask(np->n_net, &su->sin, 0); return (0); } if (forcenet) errx(1, "%s: not a network", s); } if (inet_pton(AF_INET, s, &su->sin.sin_addr) == 1) return (1); hp = gethostbyname(s); if (hp != NULL) { if (hpp != NULL) *hpp = hp; su->sin.sin_addr = *(struct in_addr *)hp->h_addr; return (1); } errx(1, "%s: bad address", s); /* NOTREACHED */ default: errx(1, "%d: bad address family", afamily); /* NOTREACHED */ } } void getmplslabel(char *s, int in) { sup su = NULL; const char *errstr; u_int32_t label; label = strtonum(s, 0, 0x000fffff, &errstr); if (errstr) errx(1, "bad label: %s is %s", s, errstr); if (in) { rtm_addrs |= RTA_DST; su = &so_dst; su->smpls.smpls_label = htonl(label << MPLS_LABEL_OFFSET); } else { rtm_addrs |= RTA_SRC; su = &so_src; su->smpls.smpls_label = htonl(label << MPLS_LABEL_OFFSET); } su->sa.sa_len = sizeof(struct sockaddr_mpls); su->sa.sa_family = AF_MPLS; } int prefixlen(char *s) { const char *errstr; int len, q, r; int max; switch (af) { case AF_INET: max = sizeof(struct in_addr) * 8; break; case AF_INET6: max = sizeof(struct in6_addr) * 8; break; default: errx(1, "prefixlen is not supported with af %d", af); /* NOTREACHED */ } rtm_addrs |= RTA_NETMASK; len = strtonum(s, 0, max, &errstr); if (errstr) errx(1, "prefixlen %s is %s", s, errstr); q = len >> 3; r = len & 7; switch (af) { case AF_INET: memset(&so_mask, 0, sizeof(so_mask)); so_mask.sin.sin_family = AF_INET; so_mask.sin.sin_len = sizeof(struct sockaddr_in); so_mask.sin.sin_addr.s_addr = htonl(0xffffffff << (32 - len)); break; case AF_INET6: so_mask.sin6.sin6_family = AF_INET6; so_mask.sin6.sin6_len = sizeof(struct sockaddr_in6); memset((void *)&so_mask.sin6.sin6_addr, 0, sizeof(so_mask.sin6.sin6_addr)); if (q > 0) memset((void *)&so_mask.sin6.sin6_addr, 0xff, q); if (r > 0) *((u_char *)&so_mask.sin6.sin6_addr + q) = (0xff00 >> r) & 0xff; break; } return (len == max); } void interfaces(void) { size_t needed; int mib[6]; char *buf = NULL, *lim, *next; struct rt_msghdr *rtm; mib[0] = CTL_NET; mib[1] = PF_ROUTE; mib[2] = 0; /* protocol */ mib[3] = 0; /* wildcard address family */ mib[4] = NET_RT_IFLIST; mib[5] = 0; /* no flags */ if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) err(1, "route-sysctl-estimate"); if (needed) { if ((buf = malloc(needed)) == NULL) err(1, "malloc"); if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) err(1, "actual retrieval of interface table"); lim = buf + needed; for (next = buf; next < lim; next += rtm->rtm_msglen) { rtm = (struct rt_msghdr *)next; print_rtmsg(rtm, rtm->rtm_msglen); } free(buf); } } void monitor(int argc, char *argv[]) { int af = 0; unsigned int filter = 0; int n; char msg[2048]; time_t now; while (--argc > 0) { if (**(++argv)== '-') switch (keyword(*argv + 1)) { case K_INET: af = AF_INET; break; case K_INET6: af = AF_INET6; break; case K_IFACE: filter = ROUTE_FILTER(RTM_IFINFO) | ROUTE_FILTER(RTM_IFANNOUNCE); break; default: usage(*argv); /* NOTREACHED */ } else usage(*argv); } s = socket(PF_ROUTE, SOCK_RAW, af); if (s == -1) err(1, "socket"); if (setsockopt(s, AF_ROUTE, ROUTE_MSGFILTER, &filter, sizeof(filter)) == -1) err(1, "setsockopt"); verbose = 1; if (debugonly) { interfaces(); exit(0); } for (;;) { if ((n = read(s, msg, sizeof(msg))) == -1) { if (errno == EINTR) continue; err(1, "read"); } now = time(NULL); printf("got message of size %d on %s", n, ctime(&now)); print_rtmsg((struct rt_msghdr *)msg, n); } } struct { struct rt_msghdr m_rtm; char m_space[512]; } m_rtmsg; int rtmsg(int cmd, int flags, int fmask, u_char prio) { static int seq; char *cp = m_rtmsg.m_space; int l; #define NEXTADDR(w, u) \ if (rtm_addrs & (w)) { \ l = ROUNDUP(u.sa.sa_len); \ memcpy(cp, &(u), l); \ cp += l; \ if (verbose) \ sodump(&(u), #u); \ } errno = 0; memset(&m_rtmsg, 0, sizeof(m_rtmsg)); if (cmd == 'a') cmd = RTM_ADD; else if (cmd == 'c') cmd = RTM_CHANGE; else if (cmd == 'g') { cmd = RTM_GET; if (so_ifp.sa.sa_family == 0) { so_ifp.sa.sa_family = AF_LINK; so_ifp.sa.sa_len = sizeof(struct sockaddr_dl); rtm_addrs |= RTA_IFP; } } else cmd = RTM_DELETE; #define rtm m_rtmsg.m_rtm rtm.rtm_type = cmd; rtm.rtm_flags = flags; rtm.rtm_fmask = fmask; rtm.rtm_version = RTM_VERSION; rtm.rtm_seq = ++seq; rtm.rtm_addrs = rtm_addrs; rtm.rtm_rmx = rt_metrics; rtm.rtm_inits = rtm_inits; rtm.rtm_tableid = tableid; rtm.rtm_priority = prio; rtm.rtm_mpls = mpls_flags; rtm.rtm_hdrlen = sizeof(rtm); if (rtm_addrs & RTA_NETMASK) mask_addr(&so_dst, &so_mask, RTA_DST); NEXTADDR(RTA_DST, so_dst); NEXTADDR(RTA_GATEWAY, so_gate); NEXTADDR(RTA_NETMASK, so_mask); NEXTADDR(RTA_GENMASK, so_genmask); NEXTADDR(RTA_IFP, so_ifp); NEXTADDR(RTA_IFA, so_ifa); NEXTADDR(RTA_LABEL, so_label); NEXTADDR(RTA_SRC, so_src); rtm.rtm_msglen = l = cp - (char *)&m_rtmsg; if (verbose) print_rtmsg(&rtm, l); if (debugonly) return (0); if (write(s, &m_rtmsg, l) != l) { if (qflag == 0) warn("writing to routing socket"); return (-1); } if (cmd == RTM_GET) { do { l = read(s, &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"); else print_getmsg(&rtm, l); } #undef rtm return (0); } void mask_addr(union sockunion *addr, union sockunion *mask, int which) { int olen = mask->sa.sa_len; char *cp1 = olen + (char *)mask, *cp2; for (mask->sa.sa_len = 0; cp1 > (char *)mask; ) if (*--cp1 != '\0') { mask->sa.sa_len = 1 + cp1 - (char *)mask; break; } if ((rtm_addrs & which) == 0) return; switch (addr->sa.sa_family) { case AF_INET: case AF_INET6: case 0: return; } cp1 = mask->sa.sa_len + 1 + (char *)addr; cp2 = addr->sa.sa_len + 1 + (char *)addr; while (cp2 > cp1) *--cp2 = '\0'; cp2 = mask->sa.sa_len + 1 + (char *)mask; while (cp1 > addr->sa.sa_data) *--cp1 &= *--cp2; } char *msgtypes[] = { "", "RTM_ADD: Add Route", "RTM_DELETE: Delete Route", "RTM_CHANGE: Change Metrics or flags", "RTM_GET: Report Metrics", "RTM_LOSING: Kernel Suspects Partitioning", "RTM_REDIRECT: Told to use different route", "RTM_MISS: Lookup failed on this address", "RTM_LOCK: fix specified metrics", "RTM_OLDADD: caused by SIOCADDRT", "RTM_OLDDEL: caused by SIOCDELRT", "RTM_RESOLVE: Route created by cloning", "RTM_NEWADDR: address being added to iface", "RTM_DELADDR: address being removed from iface", "RTM_IFINFO: iface status change", "RTM_IFANNOUNCE: iface arrival/departure", NULL }; char metricnames[] = "\011priority\010rttvar\7rtt\6ssthresh\5sendpipe\4recvpipe\3expire\2hopcount\1mtu"; char routeflags[] = "\1UP\2GATEWAY\3HOST\4REJECT\5DYNAMIC\6MODIFIED\7DONE\010MASK_PRESENT\011CLONING" "\012XRESOLVE\013LLINFO\014STATIC\015BLACKHOLE\016PROTO3\017PROTO2\020PROTO1\021CLONED\022SOURCE\023MPATH\024JUMBO\025MPLS"; char ifnetflags[] = "\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5PTP\6NOTRAILERS\7RUNNING\010NOARP\011PPROMISC" "\012ALLMULTI\013OACTIVE\014SIMPLEX\015LINK0\016LINK1\017LINK2\020MULTICAST"; char addrnames[] = "\1DST\2GATEWAY\3NETMASK\4GENMASK\5IFP\6IFA\7AUTHOR\010BRD\011SRC\12SRCMASK\013LABEL"; const char * get_linkstate(int mt, int link_state) { const struct if_status_description *p; static char buf[8]; for (p = if_status_descriptions; p->ifs_string != NULL; p++) { if (LINK_STATE_DESC_MATCH(p, mt, link_state)) return (p->ifs_string); } snprintf(buf, sizeof(buf), "[#%d]", link_state); return buf; } void print_rtmsg(struct rt_msghdr *rtm, int msglen) { struct if_msghdr *ifm; struct ifa_msghdr *ifam; struct if_announcemsghdr *ifan; char ifname[IF_NAMESIZE]; if (verbose == 0) return; if (rtm->rtm_version != RTM_VERSION) { warnx("routing message version %d not understood", rtm->rtm_version); return; } printf("%s: len %d, ", msgtypes[rtm->rtm_type], rtm->rtm_msglen); switch (rtm->rtm_type) { case RTM_IFINFO: ifm = (struct if_msghdr *)rtm; (void) printf("if# %d, ", ifm->ifm_index); if (if_indextoname(ifm->ifm_index, ifname) != NULL) printf("name: %s, ", ifname); printf("link: %s, flags:", get_linkstate(ifm->ifm_data.ifi_type, ifm->ifm_data.ifi_link_state)); bprintf(stdout, ifm->ifm_flags, ifnetflags); pmsg_addrs((char *)ifm + ifm->ifm_hdrlen, ifm->ifm_addrs); break; case RTM_NEWADDR: case RTM_DELADDR: ifam = (struct ifa_msghdr *)rtm; printf("metric %d, flags:", ifam->ifam_metric); bprintf(stdout, ifam->ifam_flags, routeflags); pmsg_addrs((char *)ifam + ifam->ifam_hdrlen, ifam->ifam_addrs); break; case RTM_IFANNOUNCE: ifan = (struct if_announcemsghdr *)rtm; printf("if# %d, name %s, what: ", ifan->ifan_index, ifan->ifan_name); switch (ifan->ifan_what) { case IFAN_ARRIVAL: printf("arrival"); break; case IFAN_DEPARTURE: printf("departure"); break; default: printf("#%d", ifan->ifan_what); break; } printf("\n"); break; default: printf("priority %d, ", rtm->rtm_priority); printf("table %u, pid: %ld, seq %d, errno %d\nflags:", rtm->rtm_tableid, (long)rtm->rtm_pid, rtm->rtm_seq, rtm->rtm_errno); bprintf(stdout, rtm->rtm_flags, routeflags); if (verbose) { #define lock(f) ((rtm->rtm_rmx.rmx_locks & __CONCAT(RTV_,f)) ? 'L' : ' ') if (rtm->rtm_rmx.rmx_expire) rtm->rtm_rmx.rmx_expire -= time(NULL); printf("\nuse: %8llu mtu: %8u%c expire: %8d%c", rtm->rtm_rmx.rmx_pksent, rtm->rtm_rmx.rmx_mtu, lock(MTU), rtm->rtm_rmx.rmx_expire, lock(EXPIRE)); #undef lock } pmsg_common(rtm); } } char * priorityname(u_int8_t prio) { switch (prio) { case RTP_NONE: return ("none"); case RTP_CONNECTED: return ("connected"); case RTP_STATIC: return ("static"); case RTP_OSPF: return ("ospf"); case RTP_ISIS: return ("is-is"); case RTP_RIP: return ("rip"); case RTP_BGP: return ("bgp"); case RTP_DEFAULT: return ("default"); default: return (""); } } void print_getmsg(struct rt_msghdr *rtm, int msglen) { struct sockaddr *dst = NULL, *gate = NULL, *mask = NULL, *ifa = NULL; struct sockaddr_dl *ifp = NULL; struct sockaddr_rtlabel *sa_rl = NULL; struct sockaddr *mpls = NULL; struct sockaddr *sa; char *cp; int i; printf(" route to: %s\n", routename(&so_dst.sa)); if (rtm->rtm_version != RTM_VERSION) { warnx("routing message version %d not understood", rtm->rtm_version); return; } if (rtm->rtm_msglen > msglen) warnx("message length mismatch, in packet %d, returned %d", rtm->rtm_msglen, msglen); if (rtm->rtm_errno) { warnx("RTM_GET: %s (errno %d)", strerror(rtm->rtm_errno), rtm->rtm_errno); return; } cp = ((char *)rtm + rtm->rtm_hdrlen); if (rtm->rtm_addrs) for (i = 1; i; i <<= 1) if (i & rtm->rtm_addrs) { sa = (struct sockaddr *)cp; switch (i) { case RTA_DST: dst = sa; break; case RTA_GATEWAY: gate = sa; break; case RTA_NETMASK: mask = sa; break; case RTA_IFA: ifa = sa; break; case RTA_IFP: if (sa->sa_family == AF_LINK && ((struct sockaddr_dl *)sa)->sdl_nlen) ifp = (struct sockaddr_dl *)sa; break; case RTA_SRC: mpls = sa; break; case RTA_LABEL: sa_rl = (struct sockaddr_rtlabel *)sa; break; } ADVANCE(cp, sa); } if (dst && mask) mask->sa_family = dst->sa_family; /* XXX */ if (dst) printf("destination: %s\n", routename(dst)); if (mask) { int savenflag = nflag; nflag = 1; printf(" mask: %s\n", routename(mask)); nflag = savenflag; } if (gate && rtm->rtm_flags & RTF_GATEWAY) printf(" gateway: %s\n", routename(gate)); if (ifp) printf(" interface: %.*s\n", ifp->sdl_nlen, ifp->sdl_data); if (ifa) printf(" if address: %s\n", routename(ifa)); if (mpls) { printf(" mpls label: %s %s\n", mpls_op(rtm->rtm_mpls), routename(mpls)); } printf(" priority: %u (%s)\n", rtm->rtm_priority, priorityname(rtm->rtm_priority)); printf(" flags: "); bprintf(stdout, rtm->rtm_flags, routeflags); printf("\n"); if (sa_rl != NULL) printf(" label: %s\n", sa_rl->sr_label); #define lock(f) ((rtm->rtm_rmx.rmx_locks & __CONCAT(RTV_,f)) ? 'L' : ' ') printf("%s\n", " use mtu expire"); printf("%8llu ", rtm->rtm_rmx.rmx_pksent); printf("%8u%c ", rtm->rtm_rmx.rmx_mtu, lock(MTU)); if (rtm->rtm_rmx.rmx_expire) rtm->rtm_rmx.rmx_expire -= time(NULL); printf("%8d%c\n", rtm->rtm_rmx.rmx_expire, lock(EXPIRE)); #undef lock #define RTA_IGN (RTA_DST|RTA_GATEWAY|RTA_NETMASK|RTA_IFP|RTA_IFA|RTA_BRD) if (verbose) pmsg_common(rtm); else if (rtm->rtm_addrs &~ RTA_IGN) { printf("sockaddrs: "); bprintf(stdout, rtm->rtm_addrs, addrnames); putchar('\n'); } #undef RTA_IGN } void pmsg_common(struct rt_msghdr *rtm) { printf("\nlocks: "); bprintf(stdout, rtm->rtm_rmx.rmx_locks, metricnames); printf(" inits: "); bprintf(stdout, rtm->rtm_inits, metricnames); pmsg_addrs(((char *)rtm + rtm->rtm_hdrlen), rtm->rtm_addrs); } void pmsg_addrs(char *cp, int addrs) { struct sockaddr *sa; int family = AF_UNSPEC; int i; char *p; if (addrs != 0) { printf("\nsockaddrs: "); bprintf(stdout, addrs, addrnames); putchar('\n'); /* first run, search for address family */ p = cp; for (i = 1; i; i <<= 1) if (i & addrs) { sa = (struct sockaddr *)p; if (family == AF_UNSPEC) switch (i) { case RTA_DST: case RTA_IFA: family = sa->sa_family; } ADVANCE(p, sa); } /* second run, set address family for mask and print */ p = cp; for (i = 1; i; i <<= 1) if (i & addrs) { sa = (struct sockaddr *)p; if (family != AF_UNSPEC) switch (i) { case RTA_NETMASK: case RTA_GENMASK: sa->sa_family = family; } printf(" %s", routename(sa)); ADVANCE(p, sa); } } putchar('\n'); fflush(stdout); } void bprintf(FILE *fp, int b, char *s) { int i; int gotsome = 0; if (b == 0) return; while ((i = *s++)) { if ((b & (1 << (i-1)))) { if (gotsome == 0) i = '<'; else i = ','; putc(i, fp); gotsome = 1; for (; (i = *s) > 32; s++) putc(i, fp); } else while (*s > 32) s++; } if (gotsome) putc('>', fp); } int keyword(char *cp) { struct keytab *kt = keywords; while (kt->kt_cp && strcmp(kt->kt_cp, cp)) kt++; return (kt->kt_i); } void sodump(sup su, char *which) { switch (su->sa.sa_family) { case AF_LINK: printf("%s: link %s; ", which, link_ntoa(&su->sdl)); break; case AF_INET: printf("%s: inet %s; ", which, inet_ntoa(su->sin.sin_addr)); break; case AF_INET6: { char ntop_buf[NI_MAXHOST]; printf("%s: inet6 %s; ", which, inet_ntop(AF_INET6, &su->sin6.sin6_addr, ntop_buf, sizeof(ntop_buf))); break; } } fflush(stdout); } /* States*/ #define VIRGIN 0 #define GOTONE 1 #define GOTTWO 2 /* Inputs */ #define DIGIT (4*0) #define END (4*1) #define DELIM (4*2) void sockaddr(char *addr, struct sockaddr *sa) { char *cp = (char *)sa; int size = sa->sa_len; char *cplim = cp + size; int byte = 0, state = VIRGIN, new = 0; memset(cp, 0, size); cp++; do { if ((*addr >= '0') && (*addr <= '9')) { new = *addr - '0'; } else if ((*addr >= 'a') && (*addr <= 'f')) { new = *addr - 'a' + 10; } else if ((*addr >= 'A') && (*addr <= 'F')) { new = *addr - 'A' + 10; } else if (*addr == '\0') state |= END; else state |= DELIM; addr++; switch (state /* | INPUT */) { case GOTTWO | DIGIT: *cp++ = byte; /*FALLTHROUGH*/ case VIRGIN | DIGIT: state = GOTONE; byte = new; continue; case GOTONE | DIGIT: state = GOTTWO; byte = new + (byte << 4); continue; default: /* | DELIM */ state = VIRGIN; *cp++ = byte; byte = 0; continue; case GOTONE | END: case GOTTWO | END: *cp++ = byte; /* FALLTHROUGH */ case VIRGIN | END: break; } break; } while (cp < cplim); sa->sa_len = cp - (char *)sa; } void getlabel(char *name) { so_label.rtlabel.sr_len = sizeof(so_label.rtlabel); so_label.rtlabel.sr_family = AF_UNSPEC; if (strlcpy(so_label.rtlabel.sr_label, name, sizeof(so_label.rtlabel.sr_label)) >= sizeof(so_label.rtlabel.sr_label)) errx(1, "label too long"); rtm_addrs |= RTA_LABEL; } int gettable(const char *s) { const char *errstr; tableid = strtonum(s, 0, RT_TABLEID_MAX, &errstr); if (errstr) errx(1, "invalid table id: %s", errstr); return (tableid); } int rdomain(int rtableid, int argc, char **argv) { if (!argc) usage(NULL); if (setrdomain(rtableid) == -1) err(1, "setrdomain"); execvp(*argv, argv); return (errno == ENOENT ? 127 : 126); }