/* $OpenBSD: route.c,v 1.75 2004/09/22 01:07:10 jaredy 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. */ #ifndef lint static const char copyright[] = "@(#) Copyright (c) 1983, 1989, 1991, 1993\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint #if 0 static const char sccsid[] = "@(#)route.c 8.3 (Berkeley) 3/19/94"; #else static const char rcsid[] = "$OpenBSD: route.c,v 1.75 2004/09/22 01:07:10 jaredy Exp $"; #endif #endif /* not lint */ #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" union sockunion { struct sockaddr sa; struct sockaddr_in sin; #ifdef INET6 struct sockaddr_in6 sin6; #endif struct sockaddr_ipx sipx; struct sockaddr_dl sdl; struct sockaddr_x25 sx25; struct sockaddr_rtin rtin; struct sockaddr_rtlabel rtlabel; } so_dst, so_gate, so_mask, so_genmask, so_ifa, so_ifp, so_label; typedef union sockunion *sup; pid_t pid; int rtm_addrs, s; int forcehost, forcenet, nflag, af, qflag, tflag, keyword(char *); int iflag, verbose, aflen = sizeof (struct sockaddr_in); int locking, lockrest, debugonly; struct rt_metrics rt_metrics; u_long rtm_inits; uid_t uid; void flushroutes(int, char **); int newroute(int, char **); void show(int, char *[]); void monitor(void); int prefixlen(char *); void sockaddr(char *, struct sockaddr *); void sodump(sup, char *); 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 which); #ifdef INET6 static int inet6_makenetandmask(struct sockaddr_in6 *); #endif int getaddr(int, char *, struct hostent **); int rtmsg(int, int); int x25_makemask(void); __dead void usage(char *); void quit(char *); void set_metric(char *, int); void inet_makenetandmask(u_int32_t, struct sockaddr_in *, int); void interfaces(void); void getlabel(char *); __dead void usage(char *cp) { if (cp) (void) fprintf(stderr, "route: botched keyword: %s\n", cp); (void) fprintf(stderr, "usage: route [ -nqSv ] cmd [[ - ] args ]\n"); (void) fprintf(stderr, "keywords: get, add, change, delete, show, flush, monitor.\n"); exit(1); /* NOTREACHED */ } void quit(char *s) { int sverrno = errno; (void) fprintf(stderr, "route: "); if (s) (void) fprintf(stderr, "%s: ", s); (void) fprintf(stderr, "%s\n", strerror(sverrno)); exit(1); /* NOTREACHED */ } #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; if (argc < 2) usage(NULL); while ((ch = getopt(argc, argv, "dnqtv")) != -1) switch(ch) { case 'n': nflag = 1; break; case 'q': qflag = 1; break; case 'v': verbose = 1; break; case 't': tflag = 1; break; case 'd': debugonly = 1; break; default: usage(NULL); } argc -= optind; argv += optind; pid = getpid(); uid = geteuid(); if (tflag) s = open(_PATH_DEVNULL, O_WRONLY); else s = socket(PF_ROUTE, SOCK_RAW, 0); if (s < 0) quit("socket"); if (*argv == NULL) goto no_cmd; switch (keyword(*argv)) { 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: monitor(); break; case K_FLUSH: flushroutes(argc, argv); break; no_cmd: default: usage(*argv); } exit(rval); } /* * Purge all entries in the routing tables not * associated with network interfaces. */ void flushroutes(int argc, char **argv) { size_t needed; int mib[6], rlen, seqno; char *buf = NULL, *next, *lim = NULL; struct rt_msghdr *rtm; struct sockaddr *sa; if (uid) { errno = EACCES; quit("must be root to alter routing table"); } shutdown(s, 0); /* Don't want to read back our messages */ if (argc > 1) { argv++; if (argc == 2 && **argv == '-') switch (keyword(*argv + 1)) { case K_INET: af = AF_INET; break; #ifdef INET6 case K_INET6: af = AF_INET6; break; #endif case K_IPX: af = AF_IPX; break; case K_LINK: af = AF_LINK; break; case K_X25: af = AF_CCITT; break; default: goto bad; } else bad: 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 */ if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) quit("route-sysctl-estimate"); if (needed) { if ((buf = malloc(needed)) == NULL) quit("malloc"); if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) quit("actual retrieval of routing table"); lim = buf + needed; } if (verbose) { (void) 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 (verbose) print_rtmsg(rtm, rtm->rtm_msglen); if ((rtm->rtm_flags & (RTF_GATEWAY|RTF_STATIC|RTF_LLINFO)) == 0) continue; sa = (struct sockaddr *)(rtm + 1); if (af) { if (sa->sa_family != af) continue; } if (sa->sa_family == AF_KEY) continue; /* Don't flush SPD */ if (debugonly) continue; rtm->rtm_type = RTM_DELETE; rtm->rtm_seq = seqno; rlen = write(s, next, rtm->rtm_msglen); if (rlen < (int)rtm->rtm_msglen) { (void) fprintf(stderr, "route: write to routing socket: %s\n", strerror(errno)); (void) 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 *)(rtm + 1); (void) 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); (void) printf("%-20.20s ", routename(sa)); (void) printf("done\n"); } } free(buf); } void set_metric(char *value, int key) { int flag = 0; u_long noval, *valp = &noval; switch (key) { #define caseof(x, y, z) case x: valp = &rt_metrics.z; flag = y; break caseof(K_MTU, RTV_MTU, rmx_mtu); caseof(K_HOPCOUNT, RTV_HOPCOUNT, rmx_hopcount); caseof(K_EXPIRE, RTV_EXPIRE, rmx_expire); caseof(K_RECVPIPE, RTV_RPIPE, rmx_recvpipe); caseof(K_SENDPIPE, RTV_SPIPE, rmx_sendpipe); caseof(K_SSTHRESH, RTV_SSTHRESH, rmx_ssthresh); caseof(K_RTT, RTV_RTT, rmx_rtt); caseof(K_RTTVAR, RTV_RTTVAR, rmx_rttvar); } rtm_inits |= flag; if (lockrest || locking) rt_metrics.rmx_locks |= flag; if (locking) locking = 0; *valp = atoi(value); } int newroute(int argc, char **argv) { char *cmd, *dest = "", *gateway = "", *err; int ishost = 0, ret = 0, attempts, oerrno, flags = RTF_STATIC; int key, mpath = 0; struct hostent *hp = 0; if (uid) { errno = EACCES; quit("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; #ifdef INET6 case K_INET6: af = AF_INET6; aflen = sizeof(struct sockaddr_in6); break; #endif case K_X25: af = AF_CCITT; aflen = sizeof(struct sockaddr_x25); break; case K_SA: af = PF_ROUTE; aflen = sizeof(union sockunion); break; case K_IPX: af = AF_IPX; aflen = sizeof(struct sockaddr_ipx); 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); (void) getaddr(RTA_IFA, *++argv, 0); break; case K_IFP: if (!--argc) usage(1+*argv); (void) getaddr(RTA_IFP, *++argv, 0); break; case K_GENMASK: if (!--argc) usage(1+*argv); (void) getaddr(RTA_GENMASK, *++argv, 0); break; case K_GATEWAY: if (!--argc) usage(1+*argv); (void) getaddr(RTA_GATEWAY, *++argv, 0); 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); (void) getlabel(*++argv); break; case K_NETMASK: if (!--argc) usage(1+*argv); (void) getaddr(RTA_NETMASK, *++argv, 0); /* FALLTHROUGH */ case K_NET: forcenet++; break; case K_PREFIXLEN: if (!--argc) usage(1+*argv); ishost = prefixlen(*++argv); break; case K_MPATH: mpath++; 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; default: usage(1+*argv); } } else { if ((rtm_addrs & RTA_DST) == 0) { dest = *argv; ishost = getaddr(RTA_DST, *argv, &hp); } else if ((rtm_addrs & RTA_GATEWAY) == 0) { gateway = *argv; (void) getaddr(RTA_GATEWAY, *argv, &hp); } else { int hops = atoi(*argv); if (hops == 0) { if (!qflag && strcmp(*argv, "0") == 0) printf("%s,%s", "old usage of trailing 0", "assuming route to if\n"); else usage(NULL); iflag = 1; continue; } else if (hops > 0 && hops < 10) { if (!qflag) { printf("old usage of trailing digit, "); printf("assuming route via gateway\n"); } iflag = 0; continue; } (void) getaddr(RTA_NETMASK, *argv, 0); } } } if (forcehost) ishost = 1; if (forcenet) ishost = 0; if (forcenet && !(rtm_addrs & RTA_NETMASK)) errx(1, "netmask missing"); flags |= RTF_UP; if (mpath) flags |= RTF_MPATH; if (ishost) flags |= RTF_HOST; if (iflag == 0) flags |= RTF_GATEWAY; for (attempts = 1; ; attempts++) { errno = 0; if ((ret = rtmsg(*cmd, flags)) == 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) { (void) printf("%s %s %s", cmd, ishost? "host" : "net", dest); if (*gateway) { (void) printf(": gateway %s", gateway); if (attempts > 1 && ret == 0 && af == AF_INET) (void) printf(" (%s)", inet_ntoa(so_gate.sin.sin_addr)); } if (ret == 0) (void) printf("\n"); if (ret != 0) { switch (oerrno) { case ESRCH: err = "not in table"; break; case EBUSY: err = "entry in use"; break; case ENOBUFS: err = "routing table overflow"; break; default: err = strerror(oerrno); break; } (void) printf(": %s\n", err); } } return (ret != 0); } void show(int argc, char *argv[]) { int af = 0; if (argc > 1) { argv++; if (argc == 2 && **argv == '-') switch (keyword(*argv + 1)) { case K_INET: af = AF_INET; break; #ifdef INET6 case K_INET6: af = AF_INET6; break; #endif case K_IPX: af = AF_IPX; break; case K_LINK: af = AF_LINK; break; case K_X25: af = AF_CCITT; break; default: goto bad; } else bad: usage(*argv); } p_rttables(af, 0); } 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; } #ifdef INET6 /* * XXX the function may need more improvement... */ static 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; (void)prefixlen(plen); return 0; } } #endif /* * 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 ccitt_addr *ccitt_addr(char *, struct sockaddr_x25 *); 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"); } 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, 0); break; case RTA_NETMASK: case RTA_GENMASK: su->sa.sa_len = 0; } return (0); } switch (afamily) { #ifdef INET6 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) { (void) fprintf(stderr, "%s: bad value\n", s); exit(1); } } if (sizeof(su->sin6) != res->ai_addrlen) { (void) fprintf(stderr, "%s: bad value\n", s); exit(1); } if (res->ai_next) { (void) fprintf(stderr, "%s: resolved to multiple values\n", s); exit(1); } memcpy(&su->sin6, res->ai_addr, sizeof(su->sin6)); freeaddrinfo(res); #ifdef __KAME__ if ((IN6_IS_ADDR_LINKLOCAL(&su->sin6.sin6_addr) || IN6_IS_ADDR_MC_LINKLOCAL(&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; } #endif if (hints.ai_flags == AI_NUMERICHOST) { if (which == RTA_DST) return (inet6_makenetandmask(&su->sin6)); return (0); } else return (1); } #endif case AF_IPX: if (which == RTA_DST) { extern short ipx_bh[3]; struct sockaddr_ipx *sms = &(so_mask.sipx); memset(sms, 0, sizeof(*sms)); sms->sipx_family = 0; sms->sipx_len = 6; sms->sipx_addr.ipx_net = *(union ipx_net *)ipx_bh; rtm_addrs |= RTA_NETMASK; } su->sipx.sipx_addr = ipx_addr(s); return (!ipx_nullhost(su->sipx.sipx_addr)); case AF_LINK: link_addr(s, &su->sdl); return (1); case AF_CCITT: ccitt_addr(s, &su->sx25); return (which == RTA_DST ? x25_makemask() : 1); 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); default: errx(1, "%d: bad address family", afamily); } } int prefixlen(char *s) { int len = atoi(s), q, r; int max; switch (af) { case AF_INET: max = sizeof(struct in_addr) * 8; break; #ifdef INET6 case AF_INET6: max = sizeof(struct in6_addr) * 8; break; #endif default: (void) fprintf(stderr, "prefixlen is not supported with af %d\n", af); exit(1); } rtm_addrs |= RTA_NETMASK; if (len < -1 || len > max) { (void) fprintf(stderr, "%s: bad value\n", s); exit(1); } 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; #ifdef INET6 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; #endif } return (len == max); } int x25_makemask(void) { char *cp; if ((rtm_addrs & RTA_NETMASK) == 0) { rtm_addrs |= RTA_NETMASK; for (cp = (char *)&so_mask.sx25.x25_net; cp < &so_mask.sx25.x25_opts.op_flags; cp++) *cp = -1; so_mask.sx25.x25_len = (u_char)&(((sup)0)->sx25.x25_opts); } return (0); } 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) quit("route-sysctl-estimate"); if (needed) { if ((buf = malloc(needed)) == NULL) quit("malloc"); if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) quit("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(void) { int n; char msg[2048]; verbose = 1; if (debugonly) { interfaces(); exit(0); } for(;;) { time_t now; n = read(s, msg, 2048); now = time(NULL); (void) 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) { 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_version = RTM_VERSION; rtm.rtm_seq = ++seq; rtm.rtm_addrs = rtm_addrs; rtm.rtm_rmx = rt_metrics; rtm.rtm_inits = rtm_inits; 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); rtm.rtm_msglen = l = cp - (char *)&m_rtmsg; if (verbose) print_rtmsg(&rtm, l); if (debugonly) return (0); if (write(s, (char *)&m_rtmsg, l) < 0) { if (qflag == 0) perror("writing to routing socket"); return (-1); } if (cmd == RTM_GET) { do { l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg)); } while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid)); if (l < 0) (void) fprintf(stderr, "route: read from routing socket: %s\n", strerror(errno)); 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_IPX: case AF_INET: #ifdef INET6 case AF_INET6: #endif case AF_CCITT: 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", 0, }; char metricnames[] = "\011pksent\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"; 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\13LABEL"; void print_rtmsg(struct rt_msghdr *rtm, int msglen) { struct if_msghdr *ifm; struct ifa_msghdr *ifam; struct if_announcemsghdr *ifan; const char *state = "unknown"; if (verbose == 0) return; if (rtm->rtm_version != RTM_VERSION) { (void) printf("routing message version %d not understood\n", rtm->rtm_version); return; } (void)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); switch (ifm->ifm_data.ifi_link_state) { case LINK_STATE_DOWN: state = "down"; break; case LINK_STATE_UP: state = "up"; break; } (void) printf("link: %s, flags:", state); bprintf(stdout, ifm->ifm_flags, ifnetflags); pmsg_addrs((char *)(ifm + 1), ifm->ifm_addrs); break; case RTM_NEWADDR: case RTM_DELADDR: ifam = (struct ifa_msghdr *)rtm; (void) printf("metric %d, flags:", ifam->ifam_metric); bprintf(stdout, ifam->ifam_flags, routeflags); pmsg_addrs((char *)(ifam + 1), ifam->ifam_addrs); break; case RTM_IFANNOUNCE: ifan = (struct if_announcemsghdr *)rtm; (void) 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: (void) printf("pid: %ld, seq %d, errno %d, flags:", (long)rtm->rtm_pid, rtm->rtm_seq, rtm->rtm_errno); bprintf(stdout, rtm->rtm_flags, routeflags); pmsg_common(rtm); } } void print_getmsg(struct rt_msghdr *rtm, int msglen) { struct sockaddr *dst = NULL, *gate = NULL, *mask = NULL; struct sockaddr_dl *ifp = NULL; struct sockaddr_rtlabel *sa_rl = NULL; struct sockaddr *sa; char *cp; int i; (void) printf(" route to: %s\n", routename(&so_dst.sa)); if (rtm->rtm_version != RTM_VERSION) { (void)fprintf(stderr, "routing message version %d not understood\n", rtm->rtm_version); return; } if (rtm->rtm_msglen > msglen) { (void)fprintf(stderr, "message length mismatch, in packet %d, returned %d\n", rtm->rtm_msglen, msglen); } if (rtm->rtm_errno) { (void) fprintf(stderr, "RTM_GET: %s (errno %d)\n", strerror(rtm->rtm_errno), rtm->rtm_errno); return; } cp = ((char *)(rtm + 1)); 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_IFP: if (sa->sa_family == AF_LINK && ((struct sockaddr_dl *)sa)->sdl_nlen) ifp = (struct sockaddr_dl *)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) (void)printf("destination: %s\n", routename(dst)); if (mask) { int savenflag = nflag; nflag = 1; (void)printf(" mask: %s\n", routename(mask)); nflag = savenflag; } if (gate && rtm->rtm_flags & RTF_GATEWAY) (void)printf(" gateway: %s\n", routename(gate)); if (ifp) (void)printf(" interface: %.*s\n", ifp->sdl_nlen, ifp->sdl_data); (void)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' : ' ') #define msec(u) (((u) + 500) / 1000) /* usec to msec */ (void) printf("%s\n", "\ recvpipe sendpipe ssthresh rtt,msec rttvar hopcount mtu expire"); printf("%8d%c ", (int)rtm->rtm_rmx.rmx_recvpipe, lock(RPIPE)); printf("%8d%c ", (int)rtm->rtm_rmx.rmx_sendpipe, lock(SPIPE)); printf("%8d%c ", (int)rtm->rtm_rmx.rmx_ssthresh, lock(SSTHRESH)); printf("%8d%c ", (int)msec(rtm->rtm_rmx.rmx_rtt), lock(RTT)); printf("%8d%c ", (int)msec(rtm->rtm_rmx.rmx_rttvar), lock(RTTVAR)); printf("%8d%c ", (int)rtm->rtm_rmx.rmx_hopcount, lock(HOPCOUNT)); printf("%8d%c ", (int)rtm->rtm_rmx.rmx_mtu, lock(MTU)); if (rtm->rtm_rmx.rmx_expire) rtm->rtm_rmx.rmx_expire -= time(0); printf("%8d%c\n", (int)rtm->rtm_rmx.rmx_expire, lock(EXPIRE)); #undef lock #undef msec #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) { (void) printf("sockaddrs: "); bprintf(stdout, rtm->rtm_addrs, addrnames); putchar('\n'); } #undef RTA_IGN } void pmsg_common(struct rt_msghdr *rtm) { (void) printf("\nlocks: "); bprintf(stdout, rtm->rtm_rmx.rmx_locks, metricnames); (void) printf(" inits: "); bprintf(stdout, rtm->rtm_inits, metricnames); pmsg_addrs(((char *)(rtm + 1)), rtm->rtm_addrs); } void pmsg_addrs(char *cp, int addrs) { struct sockaddr *sa; int i; if (addrs != 0) { (void) printf("\nsockaddrs: "); bprintf(stdout, addrs, addrnames); (void) putchar('\n'); for (i = 1; i; i <<= 1) if (i & addrs) { sa = (struct sockaddr *)cp; (void) printf(" %s", routename(sa)); ADVANCE(cp, sa); } } (void) putchar('\n'); (void) 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 = ','; (void) putc(i, fp); gotsome = 1; for (; (i = *s) > 32; s++) (void) putc(i, fp); } else while (*s > 32) s++; } if (gotsome) (void) 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) { #ifdef INET6 char ntop_buf[NI_MAXHOST]; /*for inet_ntop()*/ #endif switch (su->sa.sa_family) { case AF_LINK: (void) printf("%s: link %s; ", which, link_ntoa(&su->sdl)); break; case AF_INET: (void) printf("%s: inet %s; ", which, inet_ntoa(su->sin.sin_addr)); break; #ifdef INET6 case AF_INET6: (void) printf("%s: inet6 %s; ", which, inet_ntop(AF_INET6, &su->sin6.sin6_addr, ntop_buf, sizeof(ntop_buf))); break; #endif case AF_IPX: (void) printf("%s: ipx %s; ", which, ipx_ntoa(su->sipx.sipx_addr)); break; } (void) 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)) err(1, "label too long"); rtm_addrs |= RTA_LABEL; }