551 lines
11 KiB
C
551 lines
11 KiB
C
/*
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* Copyright (c) 1983 Regents of the University of California.
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* All rights reserved. The Berkeley software License Agreement
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* specifies the terms and conditions for redistribution.
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*/
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#ifndef lint
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static char *sccsid = "@(#)route.c 1.1 94/10/31 SMI"; /* from UCB 5.6 6/5/86 */
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#endif not lint
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <sys/mbuf.h>
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#include <signal.h>
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#include <setjmp.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#ifdef XNS
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#include <netns/ns.h>
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#endif XNS
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#include <stdio.h>
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#include <errno.h>
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#include <ctype.h>
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#include <netdb.h>
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struct rtentry route;
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int s;
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int forcehost, forcenet, doflush, nflag;
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struct sockaddr_in sin = { AF_INET };
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struct in_addr inet_makeaddr();
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char *malloc();
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main(argc, argv)
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int argc;
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char *argv[];
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{
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if (argc < 2)
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printf("usage: route [ -n ] [ -f ] [ cmd [ net | host ] args ]\n"),
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exit(1);
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s = socket(AF_INET, SOCK_RAW, 0);
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if (s < 0) {
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perror("route: socket");
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exit(1);
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}
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argc--, argv++;
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for (; argc > 0 && argv[0][0] == '-'; argc--, argv++) {
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for (argv[0]++; *argv[0]; argv[0]++)
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switch (*argv[0]) {
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case 'f':
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doflush++;
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break;
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case 'n':
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nflag++;
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break;
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}
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}
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if (doflush)
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flushroutes();
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if (argc > 0) {
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if (strcmp(*argv, "add") == 0)
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newroute(argc, argv);
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else if (strcmp(*argv, "delete") == 0)
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newroute(argc, argv);
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else if (strcmp(*argv, "change") == 0)
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changeroute(argc-1, argv+1);
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else
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printf("%s: huh?\n", *argv);
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}
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exit(0);
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/* NOTREACHED */
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}
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/*
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* Purge all entries in the routing tables not
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* associated with network interfaces.
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*/
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#include <nlist.h>
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struct nlist nl[] = {
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#define N_RTHOST 0
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{ "_rthost" },
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#define N_RTNET 1
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{ "_rtnet" },
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#define N_RTHASHSIZE 2
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{ "_rthashsize" },
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"",
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};
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flushroutes()
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{
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struct mbuf mb;
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register struct rtentry *rt;
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register struct mbuf *m;
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struct mbuf **routehash;
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int rthashsize, i, doinghost = 1, kmem;
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char *routename(), *netname();
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nlist("/vmunix", nl);
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if (nl[N_RTHOST].n_value == 0) {
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printf("route: \"rthost\", symbol not in namelist\n");
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exit(1);
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}
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if (nl[N_RTNET].n_value == 0) {
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printf("route: \"rtnet\", symbol not in namelist\n");
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exit(1);
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}
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if (nl[N_RTHASHSIZE].n_value == 0) {
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printf("route: \"rthashsize\", symbol not in namelist\n");
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exit(1);
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}
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kmem = open("/dev/kmem", 0);
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if (kmem < 0) {
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perror("route: /dev/kmem");
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exit(1);
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}
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lseek(kmem, nl[N_RTHASHSIZE].n_value, 0);
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read(kmem, &rthashsize, sizeof (rthashsize));
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routehash = (struct mbuf **)malloc(rthashsize*sizeof (struct mbuf *));
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lseek(kmem, nl[N_RTHOST].n_value, 0);
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read(kmem, routehash, rthashsize*sizeof (struct mbuf *));
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printf("Flushing routing tables:\n");
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again:
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for (i = 0; i < rthashsize; i++) {
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if (routehash[i] == 0)
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continue;
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m = routehash[i];
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while (m) {
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lseek(kmem, m, 0);
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read(kmem, &mb, sizeof (mb));
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rt = mtod(&mb, struct rtentry *);
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if (rt->rt_flags & RTF_GATEWAY) {
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printf("%-20.20s ", doinghost ?
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routename(&rt->rt_dst) :
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netname(&rt->rt_dst));
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printf("%-20.20s ", routename(&rt->rt_gateway));
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if (ioctl(s, SIOCDELRT, (caddr_t)rt) < 0)
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error("delete");
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else
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printf("done\n");
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}
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m = mb.m_next;
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}
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}
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if (doinghost) {
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lseek(kmem, nl[N_RTNET].n_value, 0);
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read(kmem, routehash, rthashsize*sizeof (struct mbuf *));
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doinghost = 0;
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goto again;
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}
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close(kmem);
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free(routehash);
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}
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static jmp_buf NameTimeout;
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int nametime = 20; /* seconds to wait for name server */
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nametimeout() {longjmp(NameTimeout, 1);}
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char *
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routename(sa)
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struct sockaddr *sa;
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{
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register char *cp;
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static char line[50];
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struct hostent *hp;
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static char domain[MAXHOSTNAMELEN + 1];
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static int first = 1;
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char *index();
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char *ns_print();
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if (first) {
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first = 0;
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if (gethostname(domain, MAXHOSTNAMELEN) == 0 &&
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(cp = index(domain, '.')))
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(void) strcpy(domain, cp + 1);
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else
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domain[0] = 0;
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}
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switch (sa->sa_family) {
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case AF_INET:
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{ struct in_addr in;
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in = ((struct sockaddr_in *)sa)->sin_addr;
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cp = 0;
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if (in.s_addr == INADDR_ANY)
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cp = "default";
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signal(SIGALRM, nametimeout);
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alarm(nametime);
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if (setjmp(NameTimeout) == 0 && cp == 0 && !nflag) {
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hp = gethostbyaddr(&in, sizeof (struct in_addr),
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AF_INET);
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if (hp) {
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if ((cp = index(hp->h_name, '.')) &&
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!strcmp(cp + 1, domain))
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*cp = 0;
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cp = hp->h_name;
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}
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}
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alarm(0);
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if (cp)
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strcpy(line, cp);
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else {
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sprintf(line, "%s", inet_ntoa(in) );
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}
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break;
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}
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# ifdef XNS
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case AF_NS:
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return (ns_print((struct sockaddr_ns *)sa));
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# endif XNS
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default:
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{ u_short *s = (u_short *)sa->sa_data;
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sprintf(line, "af %d: %x %x %x %x %x %x %x", sa->sa_family,
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s[0], s[1], s[2], s[3], s[4], s[5], s[6]);
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break;
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}
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}
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return (line);
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}
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/*
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* Return the name of the network whose address is given.
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* The address is assumed to be that of a net or subnet, not a host.
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*/
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char *
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netname(sa)
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struct sockaddr *sa;
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{
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char *cp = 0;
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static char line[50];
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struct netent *np = 0;
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u_long net, mask;
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register i;
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int subnetshift;
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switch (sa->sa_family) {
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case AF_INET:
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{ struct in_addr in;
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in = ((struct sockaddr_in *)sa)->sin_addr;
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in.s_addr = ntohl(in.s_addr);
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if (in.s_addr == 0)
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cp = "default";
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else if (!nflag) {
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if (IN_CLASSA(i)) {
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mask = IN_CLASSA_NET;
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subnetshift = 8;
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} else if (IN_CLASSB(i)) {
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mask = IN_CLASSB_NET;
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subnetshift = 8;
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} else {
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mask = IN_CLASSC_NET;
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subnetshift = 4;
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}
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/*
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* If there are more bits than the standard mask
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* would suggest, subnets must be in use.
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* Guess at the subnet mask, assuming reasonable
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* width subnet fields.
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*/
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while (in.s_addr &~ mask)
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mask = (long)mask >> subnetshift;
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net = in.s_addr & mask;
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while ((mask & 1) == 0)
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mask >>= 1, net >>= 1;
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np = getnetbyaddr(net, AF_INET);
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if (np)
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cp = np->n_name;
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}
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if (cp)
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strcpy(line, cp);
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#define C(x) ((x) & 0xff)
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else if ((in.s_addr & 0xffffff) == 0)
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sprintf(line, "%u", C(in.s_addr >> 24));
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else if ((in.s_addr & 0xffff) == 0)
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sprintf(line, "%u.%u", C(in.s_addr >> 24),
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C(in.s_addr >> 16));
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else if ((in.s_addr & 0xff) == 0)
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sprintf(line, "%u.%u.%u", C(in.s_addr >> 24),
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C(in.s_addr >> 16), C(in.s_addr >> 8));
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else
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sprintf(line, "%u.%u.%u.%u", C(in.s_addr >> 24),
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C(in.s_addr >> 16), C(in.s_addr >> 8),
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C(in.s_addr));
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break;
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}
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# ifdef XNS
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case AF_NS:
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return (ns_print((struct sockaddr_ns *)sa));
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break;
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# endif XNS
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default:
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{ u_short *s = (u_short *)sa->sa_data;
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sprintf(line, "af %d: %x %x %x %x %x %x %x", sa->sa_family,
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s[0], s[1], s[2], s[3], s[4], s[5], s[6]);
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break;
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}
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}
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return (line);
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}
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newroute(argc, argv)
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int argc;
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char *argv[];
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{
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struct sockaddr_in *sin;
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char *cmd, *dest, *gateway;
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int ishost, metric = 0, ret, attempts, oerrno;
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struct hostent *hp;
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extern int errno;
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cmd = argv[0];
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if (argc < 3) {
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printf("usage: %s destination gateway ...\n", cmd);
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return;
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}
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if ((strcmp(argv[1], "host")) == 0) {
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forcehost++;
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argc--, argv++;
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} else if ((strcmp(argv[1], "net")) == 0) {
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forcenet++;
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argc--, argv++;
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}
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if (*cmd == 'a') {
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if (argc != 4) {
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printf("usage: %s destination gateway metric\n", cmd);
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printf("(metric of 0 if gateway is this host)\n");
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return;
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}
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metric = atoi(argv[3]);
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} else {
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if (argc < 3) {
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printf("usage: %s destination gateway\n", cmd);
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return;
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}
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}
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sin = (struct sockaddr_in *)&route.rt_dst;
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ishost = getaddr(argv[1], &route.rt_dst, &hp, &dest, forcenet);
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if (forcehost)
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ishost = 1;
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if (forcenet)
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ishost = 0;
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sin = (struct sockaddr_in *)&route.rt_gateway;
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(void) getaddr(argv[2], &route.rt_gateway, &hp, &gateway, 0);
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route.rt_flags = RTF_UP;
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if (ishost)
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route.rt_flags |= RTF_HOST;
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if (metric > 0)
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route.rt_flags |= RTF_GATEWAY;
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for (attempts = 1; ; attempts++) {
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errno = 0;
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if ((ret = ioctl(s, *cmd == 'a' ? SIOCADDRT : SIOCDELRT,
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(caddr_t)&route)) == 0)
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break;
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if (errno != ENETUNREACH && errno != ESRCH)
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break;
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if (hp && hp->h_addr_list[1]) {
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hp->h_addr_list++;
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bcopy(hp->h_addr_list[0], (caddr_t)&sin->sin_addr,
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hp->h_length);
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} else
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break;
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}
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oerrno = errno;
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printf("%s %s %s: gateway %s", cmd, ishost? "host" : "net",
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dest, gateway);
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if (attempts > 1 && ret == 0)
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printf(" (%s)",
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inet_ntoa(((struct sockaddr_in *)&route.rt_gateway)->sin_addr));
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if (ret == 0)
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printf("\n");
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else {
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printf(": ");
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fflush(stdout);
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errno = oerrno;
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error(0);
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}
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}
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changeroute(argc, argv)
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int argc;
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char *argv[];
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{
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printf("not supported\n");
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}
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error(cmd)
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char *cmd;
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{
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if (errno == ESRCH)
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fprintf(stderr, "not in table\n");
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else if (errno == EBUSY)
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fprintf(stderr, "entry in use\n");
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else if (errno == ENOBUFS)
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fprintf(stderr, "routing table overflow\n");
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else
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perror(cmd);
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}
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char *
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savestr(s)
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char *s;
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{
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char *sav;
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sav = malloc(strlen(s) + 1);
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if (sav == NULL) {
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fprintf("route: out of memory\n");
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exit(1);
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}
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strcpy(sav, s);
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return (sav);
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}
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/*
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* Interpret an argument as a network address of some kind,
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* returning 1 if a host address, 0 if a network address.
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*/
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getaddr(s, sin, hpp, name, isnet)
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char *s;
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struct sockaddr_in *sin;
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struct hostent **hpp;
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char **name;
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int isnet;
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{
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struct hostent *hp;
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struct netent *np;
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u_long val;
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*hpp = 0;
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if (strcmp(s, "default") == 0) {
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sin->sin_family = AF_INET;
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sin->sin_addr = inet_makeaddr(0, INADDR_ANY);
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*name = "default";
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return(0);
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}
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sin->sin_family = AF_INET;
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val = inet_addr(s);
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if (val != -1) {
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sin->sin_addr.s_addr = val;
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*name = s;
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return(inet_lnaof(sin->sin_addr) != INADDR_ANY);
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}
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if (isnet == 0) {
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val = inet_addr(s);
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if (val != -1) {
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sin->sin_addr.s_addr = val;
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*name = s;
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return(inet_lnaof(sin->sin_addr) != INADDR_ANY);
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}
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}
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val = inet_network(s);
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if (val != -1) {
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sin->sin_addr = inet_makeaddr(val, INADDR_ANY);
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*name = s;
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return(0);
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}
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np = getnetbyname(s);
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if (np) {
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sin->sin_family = np->n_addrtype;
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sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
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*name = savestr(np->n_name);
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return(0);
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}
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hp = gethostbyname(s);
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if (hp) {
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*hpp = hp;
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sin->sin_family = hp->h_addrtype;
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bcopy(hp->h_addr, &sin->sin_addr, hp->h_length);
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*name = savestr(hp->h_name);
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return(1);
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}
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fprintf(stderr, "%s: bad value\n", s);
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exit(1);
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}
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short ns_nullh[] = {0,0,0};
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short ns_bh[] = {-1,-1,-1};
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# ifdef XNS
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char *
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ns_print(sns)
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struct sockaddr_ns *sns;
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{
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struct ns_addr work;
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union { union ns_net net_e; u_long long_e; } net;
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u_short port;
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static char mybuf[50], cport[10], chost[25];
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char *host = "";
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register char *p; register u_char *q; u_char *q_lim;
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work = sns->sns_addr;
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port = ntohs(work.x_port);
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work.x_port = 0;
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net.net_e = work.x_net;
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if (ns_nullhost(work) && net.long_e == 0) {
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if (port ) {
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sprintf(mybuf, "*.%xH", port);
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upHex(mybuf);
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} else
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sprintf(mybuf, "*.*");
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return (mybuf);
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}
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if (bcmp(ns_bh, work.x_host.c_host, 6) == 0) {
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host = "any";
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} else if (bcmp(ns_nullh, work.x_host.c_host, 6) == 0) {
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host = "*";
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} else {
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q = work.x_host.c_host;
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sprintf(chost, "%02x%02x%02x%02x%02x%02xH",
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q[0], q[1], q[2], q[3], q[4], q[5]);
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for (p = chost; *p == '0' && p < chost + 12; p++);
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host = p;
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}
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|
if (port)
|
|
sprintf(cport, ".%xH", htons(port));
|
|
else
|
|
*cport = 0;
|
|
|
|
sprintf(mybuf,"%xH.%s%s", ntohl(net.long_e), host, cport);
|
|
upHex(mybuf);
|
|
return(mybuf);
|
|
}
|
|
# endif XNS
|
|
|
|
upHex(p0)
|
|
char *p0;
|
|
{
|
|
register char *p = p0;
|
|
for (; *p; p++) switch (*p) {
|
|
|
|
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
|
|
*p += ('A' - 'a');
|
|
}
|
|
}
|