/* * 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. * 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. */ #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 char sccsid[] = "@(#)route.c 8.6 (Berkeley) 4/28/95"; #endif #endif /* not lint */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include struct keytab { const char *kt_cp; int kt_i; } keywords[] = { #include "keywords.h" {0, 0} }; struct ortentry route; union sockunion { struct sockaddr sa; struct sockaddr_in sin; #ifdef INET6 struct sockaddr_in6 sin6; #endif struct sockaddr_at sat; struct sockaddr_dl sdl; struct sockaddr_inarp sinarp; struct sockaddr_storage ss; /* added to avoid memory overrun */ } so_dst, so_gate, so_mask, so_genmask, so_ifa, so_ifp; typedef union sockunion *sup; int pid, rtm_addrs; int s; int forcehost, forcenet, doflush, nflag, af, qflag, tflag; int iflag, verbose, aflen = sizeof (struct sockaddr_in); int locking, lockrest, debugonly; struct rt_metrics rt_metrics; u_long rtm_inits; uid_t uid; static int atalk_aton(const char *, struct at_addr *); static char *atalk_ntoa(struct at_addr); static void bprintf(FILE *, int, u_char *); static void flushroutes(int argc, char *argv[]); static int getaddr(int, char *, struct hostent **); static int keyword(const char *); static void inet_makenetandmask(u_long, struct sockaddr_in *, u_long); #ifdef INET6 static int inet6_makenetandmask(struct sockaddr_in6 *, const char *); #endif static void interfaces(void); static void mask_addr(void); static void monitor(void); static const char *netname(struct sockaddr *); static void newroute(int, char **); static void pmsg_addrs(char *, int, size_t); static void pmsg_common(struct rt_msghdr *, size_t); static int prefixlen(const char *); static void print_getmsg(struct rt_msghdr *, int); static void print_rtmsg(struct rt_msghdr *, size_t); static const char *routename(struct sockaddr *); static int rtmsg(int, int); static void set_metric(char *, int); static void sockaddr(char *, struct sockaddr *); static void sodump(sup, const char *); extern char *iso_ntoa(void); static void usage(const char *) __dead2; void usage(const char *cp) { if (cp != NULL) warnx("bad keyword: %s", cp); (void) fprintf(stderr, "usage: route [-dnqtv] command [[modifiers] args]\n"); exit(EX_USAGE); /* NOTREACHED */ } int main(int argc, char **argv) { int ch; if (argc < 2) usage(NULL); while ((ch = getopt(argc, argv, "nqdtv")) != -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; case '?': default: usage(NULL); } argc -= optind; argv += optind; pid = getpid(); uid = geteuid(); if (tflag) s = open(_PATH_DEVNULL, O_WRONLY, 0); else s = socket(PF_ROUTE, SOCK_RAW, 0); if (s < 0) err(EX_OSERR, "socket"); if (*argv != NULL) switch (keyword(*argv)) { case K_GET: case K_SHOW: uid = 0; /* FALLTHROUGH */ case K_CHANGE: case K_ADD: case K_DEL: case K_DELETE: newroute(argc, argv); /* NOTREACHED */ case K_MONITOR: monitor(); /* NOTREACHED */ case K_FLUSH: flushroutes(argc, argv); exit(0); /* NOTREACHED */ } usage(*argv); /* NOTREACHED */ } /* * Purge all entries in the routing tables not * associated with network interfaces. */ static void flushroutes(int argc, char *argv[]) { size_t needed; int mib[6], rlen, seqno, count = 0; char *buf, *next, *lim; struct rt_msghdr *rtm; if (uid != 0 && !debugonly) { errx(EX_NOPERM, "must be root to alter routing table"); } shutdown(s, SHUT_RD); /* 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_ATALK: af = AF_APPLETALK; break; case K_LINK: af = AF_LINK; break; default: goto bad; } else bad: usage(*argv); } retry: 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) err(EX_OSERR, "route-sysctl-estimate"); if ((buf = malloc(needed)) == NULL) errx(EX_OSERR, "malloc failed"); if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) { if (errno == ENOMEM && count++ < 10) { warnx("Routing table grew, retrying"); sleep(1); free(buf); goto retry; } err(EX_OSERR, "route-sysctl-get"); } lim = buf + needed; if (verbose) (void) printf("Examining routing table from sysctl\n"); 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) == 0) continue; if (af != 0) { struct sockaddr *sa = (struct sockaddr *)(rtm + 1); if (sa->sa_family != af) continue; } if (debugonly) continue; rtm->rtm_type = RTM_DELETE; rtm->rtm_seq = seqno; rlen = write(s, next, rtm->rtm_msglen); if (rlen < 0 && errno == EPERM) err(1, "write to routing socket"); if (rlen < (int)rtm->rtm_msglen) { warn("write to routing socket"); (void) printf("got only %d for rlen\n", rlen); free(buf); goto retry; 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)); sa = (struct sockaddr *)(SA_SIZE(sa) + (char *)sa); (void) printf("%-20.20s ", routename(sa)); (void) printf("done\n"); } } } const char * routename(struct sockaddr *sa) { const char *cp; static char line[MAXHOSTNAMELEN + 1]; struct hostent *hp; static char domain[MAXHOSTNAMELEN + 1]; static int first = 1, n; if (first) { first = 0; if (gethostname(domain, MAXHOSTNAMELEN) == 0 && (cp = strchr(domain, '.'))) { domain[MAXHOSTNAMELEN] = '\0'; (void) strcpy(domain, cp + 1); } else domain[0] = 0; } if (sa->sa_len == 0) strcpy(line, "default"); else switch (sa->sa_family) { case AF_INET: { struct in_addr in; in = ((struct sockaddr_in *)sa)->sin_addr; cp = NULL; if (in.s_addr == INADDR_ANY || sa->sa_len < 4) cp = "default"; if (cp == NULL && !nflag) { hp = gethostbyaddr((char *)&in, sizeof (struct in_addr), AF_INET); if (hp != NULL) { char *cptr; cptr = strchr(hp->h_name, '.'); if (cptr != NULL && strcmp(cptr + 1, domain) == 0) *cptr = '\0'; cp = hp->h_name; } } if (cp != NULL) { strncpy(line, cp, sizeof(line) - 1); line[sizeof(line) - 1] = '\0'; } else (void) sprintf(line, "%s", inet_ntoa(in)); break; } #ifdef INET6 case AF_INET6: { struct sockaddr_in6 sin6; /* use static var for safety */ int niflags = 0; memset(&sin6, 0, sizeof(sin6)); memcpy(&sin6, sa, sa->sa_len); sin6.sin6_len = sizeof(struct sockaddr_in6); sin6.sin6_family = AF_INET6; #ifdef __KAME__ if (sa->sa_len == sizeof(struct sockaddr_in6) && (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr) || IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr) || IN6_IS_ADDR_MC_NODELOCAL(&sin6.sin6_addr)) && sin6.sin6_scope_id == 0) { sin6.sin6_scope_id = ntohs(*(u_int16_t *)&sin6.sin6_addr.s6_addr[2]); sin6.sin6_addr.s6_addr[2] = 0; sin6.sin6_addr.s6_addr[3] = 0; } #endif if (nflag) niflags |= NI_NUMERICHOST; if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len, line, sizeof(line), NULL, 0, niflags) != 0) strncpy(line, "invalid", sizeof(line)); return(line); } #endif case AF_APPLETALK: (void) snprintf(line, sizeof(line), "atalk %s", atalk_ntoa(((struct sockaddr_at *)sa)->sat_addr)); break; case AF_LINK: return (link_ntoa((struct sockaddr_dl *)sa)); default: { u_short *sp = (u_short *)sa; u_short *splim = sp + ((sa->sa_len + 1) >> 1); char *cps = line + sprintf(line, "(%d)", sa->sa_family); char *cpe = line + sizeof(line); while (++sp < splim && cps < cpe) /* start with sa->sa_data */ if ((n = snprintf(cps, cpe - cps, " %x", *sp)) > 0) cps += n; else *cps = '\0'; break; } } return (line); } /* * Return the name of the network whose address is given. * The address is assumed to be that of a net or subnet, not a host. */ const char * netname(struct sockaddr *sa) { const char *cp = NULL; static char line[MAXHOSTNAMELEN + 1]; struct netent *np = NULL; u_long net, mask; u_long i; int n, subnetshift; switch (sa->sa_family) { case AF_INET: { struct in_addr in; in = ((struct sockaddr_in *)sa)->sin_addr; i = in.s_addr = ntohl(in.s_addr); if (in.s_addr == 0) cp = "default"; else if (!nflag) { if (IN_CLASSA(i)) { mask = IN_CLASSA_NET; subnetshift = 8; } else if (IN_CLASSB(i)) { mask = IN_CLASSB_NET; subnetshift = 8; } else { mask = IN_CLASSC_NET; subnetshift = 4; } /* * If there are more bits than the standard mask * would suggest, subnets must be in use. * Guess at the subnet mask, assuming reasonable * width subnet fields. */ while (in.s_addr &~ mask) mask = (long)mask >> subnetshift; net = in.s_addr & mask; while ((mask & 1) == 0) mask >>= 1, net >>= 1; np = getnetbyaddr(net, AF_INET); if (np != NULL) cp = np->n_name; } #define C(x) (unsigned)((x) & 0xff) if (cp != NULL) strncpy(line, cp, sizeof(line)); else if ((in.s_addr & 0xffffff) == 0) (void) sprintf(line, "%u", C(in.s_addr >> 24)); else if ((in.s_addr & 0xffff) == 0) (void) sprintf(line, "%u.%u", C(in.s_addr >> 24), C(in.s_addr >> 16)); else if ((in.s_addr & 0xff) == 0) (void) sprintf(line, "%u.%u.%u", C(in.s_addr >> 24), C(in.s_addr >> 16), C(in.s_addr >> 8)); else (void) sprintf(line, "%u.%u.%u.%u", C(in.s_addr >> 24), C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr)); #undef C break; } #ifdef INET6 case AF_INET6: { struct sockaddr_in6 sin6; /* use static var for safety */ int niflags = 0; memset(&sin6, 0, sizeof(sin6)); memcpy(&sin6, sa, sa->sa_len); sin6.sin6_len = sizeof(struct sockaddr_in6); sin6.sin6_family = AF_INET6; #ifdef __KAME__ if (sa->sa_len == sizeof(struct sockaddr_in6) && (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr) || IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr) || IN6_IS_ADDR_MC_NODELOCAL(&sin6.sin6_addr)) && sin6.sin6_scope_id == 0) { sin6.sin6_scope_id = ntohs(*(u_int16_t *)&sin6.sin6_addr.s6_addr[2]); sin6.sin6_addr.s6_addr[2] = 0; sin6.sin6_addr.s6_addr[3] = 0; } #endif if (nflag) niflags |= NI_NUMERICHOST; if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len, line, sizeof(line), NULL, 0, niflags) != 0) strncpy(line, "invalid", sizeof(line)); return(line); } #endif case AF_APPLETALK: (void) snprintf(line, sizeof(line), "atalk %s", atalk_ntoa(((struct sockaddr_at *)sa)->sat_addr)); break; case AF_LINK: return (link_ntoa((struct sockaddr_dl *)sa)); default: { u_short *sp = (u_short *)sa->sa_data; u_short *splim = sp + ((sa->sa_len + 1)>>1); char *cps = line + sprintf(line, "af %d:", sa->sa_family); char *cpe = line + sizeof(line); while (sp < splim && cps < cpe) if ((n = snprintf(cps, cpe - cps, " %x", *sp++)) > 0) cps += n; else *cps = '\0'; break; } } return (line); } static 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); caseof(K_WEIGHT, RTV_WEIGHT, rmx_weight); } rtm_inits |= flag; if (lockrest || locking) rt_metrics.rmx_locks |= flag; if (locking) locking = 0; *valp = atoi(value); } static void newroute(int argc, char **argv) { char *cmd; const char *dest = "", *gateway = "", *errmsg; int ishost = 0, proxy = 0, ret, attempts, oerrno, flags = RTF_STATIC; int key; struct hostent *hp = 0; if (uid != 0) { errx(EX_NOPERM, "must be root to alter routing table"); } cmd = argv[0]; if (*cmd != 'g' && *cmd != 's') shutdown(s, SHUT_RD); /* 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_ATALK: af = AF_APPLETALK; aflen = sizeof(struct sockaddr_at); break; case K_SA: af = PF_ROUTE; aflen = sizeof(union sockunion); break; case K_IFACE: case K_INTERFACE: iflag++; break; case K_NOSTATIC: flags &= ~RTF_STATIC; 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_PROXY: proxy = 1; break; case K_XRESOLVE: flags |= RTF_XRESOLVE; break; case K_STATIC: flags |= RTF_STATIC; break; case K_STICKY: flags |= RTF_STICKY; break; case K_NOSTICK: flags &= ~RTF_STICKY; break; case K_IFA: if (!--argc) usage(NULL); (void) getaddr(RTA_IFA, *++argv, 0); break; case K_IFP: if (!--argc) usage(NULL); (void) getaddr(RTA_IFP, *++argv, 0); break; case K_GENMASK: if (!--argc) usage(NULL); (void) getaddr(RTA_GENMASK, *++argv, 0); break; case K_GATEWAY: if (!--argc) usage(NULL); (void) getaddr(RTA_GATEWAY, *++argv, 0); break; case K_DST: if (!--argc) usage(NULL); ishost = getaddr(RTA_DST, *++argv, &hp); dest = *argv; break; case K_NETMASK: if (!--argc) usage(NULL); (void) getaddr(RTA_NETMASK, *++argv, 0); /* FALLTHROUGH */ case K_NET: forcenet++; break; case K_PREFIXLEN: if (!--argc) usage(NULL); if (prefixlen(*++argv) == -1) { forcenet = 0; ishost = 1; } else { forcenet = 1; ishost = 0; } 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: case K_WEIGHT: if (!--argc) usage(NULL); 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 { (void) getaddr(RTA_NETMASK, *argv, 0); forcenet = 1; } } } if (forcehost) { ishost = 1; #ifdef INET6 if (af == AF_INET6) { rtm_addrs &= ~RTA_NETMASK; memset((void *)&so_mask, 0, sizeof(so_mask)); } #endif } if (forcenet) ishost = 0; flags |= RTF_UP; if (ishost) flags |= RTF_HOST; if (iflag == 0) flags |= RTF_GATEWAY; if (proxy) { so_dst.sinarp.sin_other = SIN_PROXY; flags |= RTF_ANNOUNCE; } for (attempts = 1; ; attempts++) { errno = 0; if ((ret = rtmsg(*cmd, flags)) == 0) break; if (errno != ENETUNREACH && errno != ESRCH) break; if (af == AF_INET && *gateway != '\0' && hp != NULL && hp->h_addr_list[1] != NULL) { hp->h_addr_list++; memmove(&so_gate.sin.sin_addr, hp->h_addr_list[0], MIN((size_t)hp->h_length, sizeof(so_gate.sin.sin_addr))); } else break; } if (*cmd == 'g' || *cmd == 's') exit(ret != 0); if (!qflag) { oerrno = errno; (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(((struct sockaddr_in *)&route.rt_gateway)->sin_addr)); } if (ret == 0) { (void) printf("\n"); } else { switch (oerrno) { case ESRCH: errmsg = "not in table"; break; case EBUSY: errmsg = "entry in use"; break; case ENOBUFS: errmsg = "not enough memory"; break; case EADDRINUSE: /* handle recursion avoidance in rt_setgate() */ errmsg = "gateway uses the same route"; break; case EEXIST: errmsg = "route already in table"; break; default: errmsg = strerror(oerrno); break; } (void) printf(": %s\n", errmsg); } } exit(ret != 0); } static void inet_makenetandmask(u_long net, struct sockaddr_in *sin, u_long bits) { u_long addr, mask = 0; char *cp; rtm_addrs |= RTA_NETMASK; /* * XXX: This approach unable to handle 0.0.0.1/32 correctly * as inet_network() converts 0.0.0.1 and 1 equally. */ if (net <= 0xff) addr = net << IN_CLASSA_NSHIFT; else if (net <= 0xffff) addr = net << IN_CLASSB_NSHIFT; else if (net <= 0xffffff) addr = net << IN_CLASSC_NSHIFT; else addr = net; /* * If no /xx was specified we must calculate the * CIDR address. */ if ((bits == 0) && (addr != 0)) { u_long i, j; for(i=0,j=0xff; i<4; i++) { if (addr & j) { break; } j <<= 8; } /* i holds the first non zero bit */ bits = 32 - (i*8); } if (bits != 0) mask = 0xffffffff << (32 - bits); 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, const char *plen) { struct in6_addr in6; if (plen == NULL) { 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 == NULL || strcmp(plen, "128") == 0) return (1); rtm_addrs |= RTA_NETMASK; 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. */ static int getaddr(int which, char *str, struct hostent **hpp) { sup su; struct hostent *hp; struct netent *np; u_long val; char *q; int afamily; /* local copy of af so we can change it */ if (af == 0) { af = AF_INET; aflen = sizeof(struct sockaddr_in); } afamily = af; rtm_addrs |= which; switch (which) { case RTA_DST: su = &so_dst; break; case RTA_GATEWAY: su = &so_gate; if (iflag) { struct ifaddrs *ifap, *ifa; struct sockaddr_dl *sdl = NULL; if (getifaddrs(&ifap)) err(1, "getifaddrs"); for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) { if (ifa->ifa_addr->sa_family != AF_LINK) continue; if (strcmp(str, ifa->ifa_name) != 0) continue; sdl = (struct sockaddr_dl *)ifa->ifa_addr; } /* If we found it, then use it */ if (sdl != NULL) { /* * Copy is safe since we have a * sockaddr_storage member in sockunion{}. * Note that we need to copy before calling * freeifaddrs(). */ memcpy(&su->sdl, sdl, sdl->sdl_len); } freeifaddrs(ifap); if (sdl != NULL) return(1); } 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: usage("internal error"); /*NOTREACHED*/ } su->sa.sa_len = aflen; su->sa.sa_family = afamily; /* cases that don't want it have left already */ if (strcmp(str, "default") == 0) { /* * Default is net 0.0.0.0/0 */ switch (which) { case RTA_DST: forcenet++; #if 0 bzero(su, sizeof(*su)); /* for readability */ #endif getaddr(RTA_NETMASK, str, 0); break; #if 0 case RTA_NETMASK: case RTA_GENMASK: bzero(su, sizeof(*su)); /* for readability */ #endif } return (0); } switch (afamily) { #ifdef INET6 case AF_INET6: { struct addrinfo hints, *res; int ecode; q = NULL; if (which == RTA_DST && (q = strchr(str, '/')) != NULL) *q = '\0'; memset(&hints, 0, sizeof(hints)); hints.ai_family = afamily; /*AF_INET6*/ hints.ai_socktype = SOCK_DGRAM; /*dummy*/ ecode = getaddrinfo(str, NULL, &hints, &res); if (ecode != 0 || res->ai_family != AF_INET6 || res->ai_addrlen != sizeof(su->sin6)) { (void) fprintf(stderr, "%s: %s\n", str, gai_strerror(ecode)); exit(1); } memcpy(&su->sin6, res->ai_addr, sizeof(su->sin6)); #ifdef __KAME__ if ((IN6_IS_ADDR_LINKLOCAL(&su->sin6.sin6_addr) || IN6_IS_ADDR_MC_LINKLOCAL(&su->sin6.sin6_addr) || IN6_IS_ADDR_MC_NODELOCAL(&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 freeaddrinfo(res); if (q != NULL) *q++ = '/'; if (which == RTA_DST) return (inet6_makenetandmask(&su->sin6, q)); return (0); } #endif /* INET6 */ case AF_APPLETALK: if (!atalk_aton(str, &su->sat.sat_addr)) errx(EX_NOHOST, "bad address: %s", str); rtm_addrs |= RTA_NETMASK; return(forcehost || su->sat.sat_addr.s_node != 0); case AF_LINK: link_addr(str, &su->sdl); return (1); case PF_ROUTE: su->sa.sa_len = sizeof(*su); sockaddr(str, &su->sa); return (1); case AF_INET: default: break; } if (hpp == NULL) hpp = &hp; *hpp = NULL; q = strchr(str,'/'); if (q != NULL && which == RTA_DST) { *q = '\0'; if ((val = inet_network(str)) != INADDR_NONE) { inet_makenetandmask( val, &su->sin, strtoul(q+1, 0, 0)); return (0); } *q = '/'; } if ((which != RTA_DST || forcenet == 0) && inet_aton(str, &su->sin.sin_addr)) { val = su->sin.sin_addr.s_addr; if (which != RTA_DST || forcehost || inet_lnaof(su->sin.sin_addr) != INADDR_ANY) return (1); else { val = ntohl(val); goto netdone; } } if (which == RTA_DST && forcehost == 0 && ((val = inet_network(str)) != INADDR_NONE || ((np = getnetbyname(str)) != NULL && (val = np->n_net) != 0))) { netdone: inet_makenetandmask(val, &su->sin, 0); return (0); } hp = gethostbyname(str); if (hp != NULL) { *hpp = hp; su->sin.sin_family = hp->h_addrtype; memmove((char *)&su->sin.sin_addr, hp->h_addr, MIN((size_t)hp->h_length, sizeof(su->sin.sin_addr))); return (1); } errx(EX_NOHOST, "bad address: %s", str); } static int prefixlen(const char *str) { int len = atoi(str), q, r; int max; char *p; rtm_addrs |= RTA_NETMASK; switch (af) { #ifdef INET6 case AF_INET6: max = 128; p = (char *)&so_mask.sin6.sin6_addr; break; #endif case AF_INET: max = 32; p = (char *)&so_mask.sin.sin_addr; break; default: fprintf(stderr, "prefixlen not supported in this af\n"); exit(1); } if (len < 0 || max < len) { fprintf(stderr, "%s: bad value\n", str); exit(1); } q = len >> 3; r = len & 7; so_mask.sa.sa_family = af; so_mask.sa.sa_len = aflen; memset((void *)p, 0, max / 8); if (q > 0) memset((void *)p, 0xff, q); if (r > 0) *((u_char *)p + q) = (0xff00 >> r) & 0xff; if (len == max) return (-1); else return (len); } static void interfaces(void) { size_t needed; int mib[6]; char *buf, *lim, *next, count = 0; struct rt_msghdr *rtm; retry2: 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(EX_OSERR, "route-sysctl-estimate"); if ((buf = malloc(needed)) == NULL) errx(EX_OSERR, "malloc failed"); if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) { if (errno == ENOMEM && count++ < 10) { warnx("Routing table grew, retrying"); sleep(1); free(buf); goto retry2; } err(EX_OSERR, "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); } } static 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("\ngot 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; static int rtmsg(int cmd, int flags) { static int seq; int rlen; char *cp = m_rtmsg.m_space; int l; #define NEXTADDR(w, u) \ if (rtm_addrs & (w)) {\ l = SA_SIZE(&(u.sa)); memmove(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 == 's') { 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(); 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); rtm.rtm_msglen = l = cp - (char *)&m_rtmsg; if (verbose) print_rtmsg(&rtm, l); if (debugonly) return (0); if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) { if (errno == EPERM) err(1, "writing to routing socket"); warn("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) warn("read from routing socket"); else print_getmsg(&rtm, l); } #undef rtm return (0); } static void mask_addr(void) { int olen = so_mask.sa.sa_len; char *cp1 = olen + (char *)&so_mask, *cp2; for (so_mask.sa.sa_len = 0; cp1 > (char *)&so_mask; ) if (*--cp1 != 0) { so_mask.sa.sa_len = 1 + cp1 - (char *)&so_mask; break; } if ((rtm_addrs & RTA_DST) == 0) return; switch (so_dst.sa.sa_family) { case AF_INET: #ifdef INET6 case AF_INET6: #endif case AF_APPLETALK: case 0: return; } cp1 = so_mask.sa.sa_len + 1 + (char *)&so_dst; cp2 = so_dst.sa.sa_len + 1 + (char *)&so_dst; while (cp2 > cp1) *--cp2 = 0; cp2 = so_mask.sa.sa_len + 1 + (char *)&so_mask; while (cp1 > so_dst.sa.sa_data) *--cp1 &= *--cp2; } const 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_NEWMADDR: new multicast group membership on iface", "RTM_DELMADDR: multicast group membership removed from iface", "RTM_IFANNOUNCE: interface arrival/departure", "RTM_IEEE80211: IEEE 802.11 wireless event", }; char metricnames[] = "\011weight\010rttvar\7rtt\6ssthresh\5sendpipe\4recvpipe\3expire" "\1mtu"; char routeflags[] = "\1UP\2GATEWAY\3HOST\4REJECT\5DYNAMIC\6MODIFIED\7DONE" "\012XRESOLVE\013LLINFO\014STATIC\015BLACKHOLE" "\017PROTO2\020PROTO1\021PRCLONING\022WASCLONED\023PROTO3" "\025PINNED\026LOCAL\027BROADCAST\030MULTICAST\035STICKY"; char ifnetflags[] = "\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5PTP\6b6\7RUNNING\010NOARP" "\011PPROMISC\012ALLMULTI\013OACTIVE\014SIMPLEX\015LINK0\016LINK1" "\017LINK2\020MULTICAST"; char addrnames[] = "\1DST\2GATEWAY\3NETMASK\4GENMASK\5IFP\6IFA\7AUTHOR\010BRD"; static const char errfmt[] = "\n%s: truncated route message, only %zu bytes left\n"; static void print_rtmsg(struct rt_msghdr *rtm, size_t msglen) { struct if_msghdr *ifm; struct ifa_msghdr *ifam; #ifdef RTM_NEWMADDR struct ifma_msghdr *ifmam; #endif struct if_announcemsghdr *ifan; const char *state; if (verbose == 0) return; if (rtm->rtm_version != RTM_VERSION) { (void) printf("routing message version %d not understood\n", rtm->rtm_version); return; } if (rtm->rtm_type < sizeof(msgtypes) / sizeof(msgtypes[0])) (void)printf("%s: ", msgtypes[rtm->rtm_type]); else (void)printf("unknown type %d: ", rtm->rtm_type); (void)printf("len %d, ", rtm->rtm_msglen); #define REQUIRE(x) do { \ if (msglen < sizeof(x)) \ goto badlen; \ else \ msglen -= sizeof(x); \ } while (0) switch (rtm->rtm_type) { case RTM_IFINFO: REQUIRE(struct if_msghdr); 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; default: state = "unknown"; break; } (void) printf("link: %s, flags:", state); bprintf(stdout, ifm->ifm_flags, ifnetflags); pmsg_addrs((char *)(ifm + 1), ifm->ifm_addrs, msglen); break; case RTM_NEWADDR: case RTM_DELADDR: REQUIRE(struct ifa_msghdr); 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, msglen); break; #ifdef RTM_NEWMADDR case RTM_NEWMADDR: case RTM_DELMADDR: REQUIRE(struct ifma_msghdr); ifmam = (struct ifma_msghdr *)rtm; pmsg_addrs((char *)(ifmam + 1), ifmam->ifmam_addrs, msglen); break; #endif case RTM_IFANNOUNCE: REQUIRE(struct if_announcemsghdr); ifan = (struct if_announcemsghdr *)rtm; (void) printf("if# %d, what: ", ifan->ifan_index); 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, msglen); } return; badlen: (void)printf(errfmt, __func__, msglen); #undef REQUIRE } static void print_getmsg(struct rt_msghdr *rtm, int msglen) { struct sockaddr *dst = NULL, *gate = NULL, *mask = NULL; struct sockaddr_dl *ifp = NULL; struct sockaddr *sa; char *cp; int i; (void) printf(" route to: %s\n", routename((struct sockaddr *)&so_dst)); 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) { errno = rtm->rtm_errno; warn("message indicates error %d", 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; } cp += SA_SIZE(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); #define lock(f) ((rtm->rtm_rmx.rmx_locks & __CONCAT(RTV_,f)) ? 'L' : ' ') #define msec(u) (((u) + 500) / 1000) /* usec to msec */ (void) printf("\n%s\n", "\ recvpipe sendpipe ssthresh rtt,msec mtu weight expire"); printf("%8ld%c ", rtm->rtm_rmx.rmx_recvpipe, lock(RPIPE)); printf("%8ld%c ", rtm->rtm_rmx.rmx_sendpipe, lock(SPIPE)); printf("%8ld%c ", rtm->rtm_rmx.rmx_ssthresh, lock(SSTHRESH)); printf("%8ld%c ", msec(rtm->rtm_rmx.rmx_rtt), lock(RTT)); printf("%8ld%c ", rtm->rtm_rmx.rmx_mtu, lock(MTU)); printf("%8ld%c ", rtm->rtm_rmx.rmx_weight, lock(WEIGHT)); if (rtm->rtm_rmx.rmx_expire) rtm->rtm_rmx.rmx_expire -= time(0); printf("%8ld%c\n", 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, msglen); else if (rtm->rtm_addrs &~ RTA_IGN) { (void) printf("sockaddrs: "); bprintf(stdout, rtm->rtm_addrs, addrnames); putchar('\n'); } #undef RTA_IGN } static void pmsg_common(struct rt_msghdr *rtm, size_t msglen) { (void) printf("\nlocks: "); bprintf(stdout, rtm->rtm_rmx.rmx_locks, metricnames); (void) printf(" inits: "); bprintf(stdout, rtm->rtm_inits, metricnames); if (msglen > sizeof(struct rt_msghdr)) pmsg_addrs(((char *)(rtm + 1)), rtm->rtm_addrs, msglen - sizeof(struct rt_msghdr)); else (void) fflush(stdout); } static void pmsg_addrs(char *cp, int addrs, size_t len) { struct sockaddr *sa; int i; if (addrs == 0) { (void) putchar('\n'); return; } (void) printf("\nsockaddrs: "); bprintf(stdout, addrs, addrnames); (void) putchar('\n'); for (i = 1; i != 0; i <<= 1) if (i & addrs) { sa = (struct sockaddr *)cp; if (len == 0 || len < SA_SIZE(sa)) { (void) printf(errfmt, __func__, len); break; } (void) printf(" %s", routename(sa)); len -= SA_SIZE(sa); cp += SA_SIZE(sa); } (void) putchar('\n'); (void) fflush(stdout); } static void bprintf(FILE *fp, int b, u_char *str) { int i; int gotsome = 0; if (b == 0) return; while ((i = *str++) != 0) { if (b & (1 << (i-1))) { if (gotsome == 0) i = '<'; else i = ','; (void) putc(i, fp); gotsome = 1; for (; (i = *str) > 32; str++) (void) putc(i, fp); } else while (*str > 32) str++; } if (gotsome) (void) putc('>', fp); } int keyword(const char *cp) { struct keytab *kt = keywords; while (kt->kt_cp != NULL && strcmp(kt->kt_cp, cp) != 0) kt++; return (kt->kt_i); } static void sodump(sup su, const char *which) { 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; case AF_APPLETALK: (void) printf("%s: atalk %s; ", which, atalk_ntoa(su->sat.sat_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) static 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 /* foil gcc */; 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; } static int atalk_aton(const char *text, struct at_addr *addr) { u_int net, node; if (sscanf(text, "%u.%u", &net, &node) != 2 || net > 0xffff || node > 0xff) return(0); addr->s_net = htons(net); addr->s_node = node; return(1); } static char * atalk_ntoa(struct at_addr at) { static char buf[20]; (void) snprintf(buf, sizeof(buf), "%u.%u", ntohs(at.s_net), at.s_node); return(buf); }