357 lines
7.3 KiB
C
357 lines
7.3 KiB
C
#ifndef lint
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static char sccsid[] = "@(#)arp.c 1.1 94/10/31 SMI"; /* from UCB 5.2 2/21/86 */
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#endif
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/*
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* arp - display, set, and delete arp table entries
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*/
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#define temporary
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#ifdef temporary
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int h_errno = 0;
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#endif temporary
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <netdb.h>
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#include <nlist.h>
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#include <net/if.h>
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#include <net/if_arp.h>
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#include <netinet/if_ether.h>
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extern int errno;
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main(argc, argv)
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char **argv;
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{
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if (argc >= 2 && strcmp(argv[1], "-a") == 0) {
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char *kernel = "/vmunix", *mem = "/dev/kmem";
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if (argc >= 3)
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kernel = argv[2];
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if (argc >= 4)
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mem = argv[3];
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dump(kernel, mem);
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exit(0);
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}
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if (argc == 2) {
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get(argv[1]);
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exit(0);
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}
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if (argc >= 4 && strcmp(argv[1], "-s") == 0) {
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if (set(argc-2, &argv[2]))
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exit(1);
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exit(0);
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}
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if (argc == 3 && strcmp(argv[1], "-d") == 0) {
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delete(argv[2]);
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exit(0);
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}
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if (argc == 3 && strcmp(argv[1], "-f") == 0) {
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if (file(argv[2]))
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exit(1);
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exit(0);
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}
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usage();
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exit(1);
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/* NOTREACHED */
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}
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/*
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* Process a file to set standard arp entries
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*/
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file(name)
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char *name;
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{
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FILE *fp;
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int i;
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char line[100], arg[5][50], *args[5];
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register int retval;
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if ((fp = fopen(name, "r")) == NULL) {
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fprintf(stderr, "arp: cannot open %s\n", name);
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exit(1);
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}
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args[0] = &arg[0][0];
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args[1] = &arg[1][0];
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args[2] = &arg[2][0];
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args[3] = &arg[3][0];
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args[4] = &arg[4][0];
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retval = 0;
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while(fgets(line, 100, fp) != NULL) {
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i = sscanf(line, "%s %s %s %s %s", arg[0], arg[1], arg[2],
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arg[3], arg[4]);
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if (i < 2) {
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fprintf(stderr, "arp: bad line: %s\n", line);
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retval = 1;
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continue;
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}
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if (set(i, args))
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retval = 1;
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}
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fclose(fp);
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return (retval);
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}
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/*
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* Set an individual arp entry
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*/
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set(argc, argv)
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char **argv;
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{
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struct arpreq ar;
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struct hostent *hp;
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struct sockaddr_in *sin;
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u_char *ea;
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int s;
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char *host = argv[0], *eaddr = argv[1];
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argc -= 2;
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argv += 2;
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bzero((caddr_t)&ar, sizeof ar);
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sin = (struct sockaddr_in *)&ar.arp_pa;
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sin->sin_family = AF_INET;
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sin->sin_addr.s_addr = inet_addr(host);
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if (sin->sin_addr.s_addr == -1) {
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hp = gethostbyname(host);
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if (hp == NULL) {
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fprintf(stderr, "arp: %s: unknown host\n", host);
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return (1);
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}
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bcopy((char *)hp->h_addr, (char *)&sin->sin_addr,
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sizeof sin->sin_addr);
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}
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ea = (u_char *)ar.arp_ha.sa_data;
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if (ether_aton(eaddr, ea))
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return (1);
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ar.arp_flags = ATF_PERM;
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while (argc-- > 0) {
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if (strncmp(argv[0], "temp", 4) == 0)
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ar.arp_flags &= ~ATF_PERM;
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if (strncmp(argv[0], "pub", 3) == 0)
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ar.arp_flags |= ATF_PUBL;
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if (strncmp(argv[0], "trail", 5) == 0)
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ar.arp_flags |= ATF_USETRAILERS;
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argv++;
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}
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s = socket(AF_INET, SOCK_DGRAM, 0);
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if (s < 0) {
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perror("arp: socket");
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exit(1);
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}
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if (ioctl(s, SIOCSARP, (caddr_t)&ar) < 0) {
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perror(host);
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exit(1);
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}
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close(s);
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return (0);
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}
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/*
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* Display an individual arp entry
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*/
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get(host)
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char *host;
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{
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struct arpreq ar;
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struct hostent *hp;
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struct sockaddr_in *sin;
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u_char *ea;
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int s;
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bzero((caddr_t)&ar, sizeof ar);
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ar.arp_pa.sa_family = AF_INET;
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sin = (struct sockaddr_in *)&ar.arp_pa;
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sin->sin_family = AF_INET;
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sin->sin_addr.s_addr = inet_addr(host);
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if (sin->sin_addr.s_addr == -1) {
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hp = gethostbyname(host);
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if (hp == NULL) {
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fprintf(stderr, "arp: %s: unknown host\n", host);
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exit(1);
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}
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bcopy((char *)hp->h_addr, (char *)&sin->sin_addr,
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sizeof sin->sin_addr);
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}
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s = socket(AF_INET, SOCK_DGRAM, 0);
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if (s < 0) {
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perror("arp: socket");
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exit(1);
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}
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if (ioctl(s, SIOCGARP, (caddr_t)&ar) < 0) {
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if (errno == ENXIO)
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printf("%s (%s) -- no entry\n",
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host, inet_ntoa(sin->sin_addr));
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else
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perror("SIOCGARP");
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exit(1);
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}
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close(s);
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ea = (u_char *)ar.arp_ha.sa_data;
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printf("%s (%s) at ", host, inet_ntoa(sin->sin_addr));
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if (ar.arp_flags & ATF_COM)
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ether_print(ea);
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else
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printf("(incomplete)");
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if (ar.arp_flags & ATF_PERM) printf(" permanent");
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if (ar.arp_flags & ATF_PUBL) printf(" published");
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if (ar.arp_flags & ATF_USETRAILERS) printf(" trailers");
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printf("\n");
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}
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/*
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* Delete an arp entry
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*/
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delete(host)
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char *host;
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{
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struct arpreq ar;
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struct hostent *hp;
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struct sockaddr_in *sin;
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int s;
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bzero((caddr_t)&ar, sizeof ar);
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ar.arp_pa.sa_family = AF_INET;
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sin = (struct sockaddr_in *)&ar.arp_pa;
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sin->sin_family = AF_INET;
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sin->sin_addr.s_addr = inet_addr(host);
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if (sin->sin_addr.s_addr == -1) {
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hp = gethostbyname(host);
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if (hp == NULL) {
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fprintf(stderr, "arp: %s: unknown host\n", host);
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exit(1);
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}
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bcopy((char *)hp->h_addr, (char *)&sin->sin_addr,
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sizeof sin->sin_addr);
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}
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s = socket(AF_INET, SOCK_DGRAM, 0);
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if (s < 0) {
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perror("arp: socket");
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exit(1);
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}
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if (ioctl(s, SIOCDARP, (caddr_t)&ar) < 0) {
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if (errno == ENXIO)
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printf("%s (%s) -- no entry\n",
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host, inet_ntoa(sin->sin_addr));
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else
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perror("SIOCDARP");
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exit(1);
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}
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close(s);
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printf("%s (%s) deleted\n", host, inet_ntoa(sin->sin_addr));
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}
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struct nlist nl[] = {
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#define X_ARPTAB 0
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{ "_arptab" },
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#define X_ARPTAB_SIZE 1
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{ "_arptab_size" },
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{ "" },
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};
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/*
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* Dump the entire arp table
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*/
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dump(kernel, mem)
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char *kernel, *mem;
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{
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int mf, arptab_size, sz;
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struct arptab *at;
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struct hostent *hp;
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char *host;
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int bynumber = 0;
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nlist(kernel, nl);
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if(nl[X_ARPTAB_SIZE].n_type == 0) {
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fprintf(stderr, "arp: %s: bad namelist\n", kernel);
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exit(1);
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}
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mf = open(mem, 0);
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if(mf < 0) {
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fprintf(stderr, "arp: cannot open %s\n", mem);
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exit(1);
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}
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lseek(mf, (long)nl[X_ARPTAB_SIZE].n_value, 0);
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read(mf, &arptab_size, sizeof arptab_size);
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if (arptab_size <=0 || arptab_size > 2000) {
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fprintf(stderr, "arp: %s: namelist wrong\n", kernel);
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exit(1);
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}
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sz = arptab_size * sizeof (struct arptab);
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at = (struct arptab *)malloc(sz);
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if (at == NULL) {
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fprintf(stderr, "arp: can't get memory for arptab\n");
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exit(1);
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}
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lseek(mf, (long)nl[X_ARPTAB].n_value, 0);
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if (read(mf, (char *)at, sz) != sz) {
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perror("arp: error reading arptab");
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exit(1);
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}
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close(mf);
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for (; arptab_size-- > 0; at++) {
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if (at->at_iaddr.s_addr == 0 || at->at_flags == 0)
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continue;
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if (bynumber == 0)
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hp = gethostbyaddr((caddr_t)&at->at_iaddr,
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sizeof at->at_iaddr, AF_INET);
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else
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hp = 0;
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if (hp)
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host = hp->h_name;
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else {
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host = "?";
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if (h_errno == TRY_AGAIN)
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bynumber = 1;
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}
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printf("%s (%s) at ", host, inet_ntoa(at->at_iaddr));
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if (at->at_flags & ATF_COM)
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ether_print(&at->at_enaddr);
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else
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printf("(incomplete)");
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if (at->at_flags & ATF_PERM) printf(" permanent");
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if (at->at_flags & ATF_PUBL) printf(" published");
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if (at->at_flags & ATF_USETRAILERS) printf(" trailers");
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printf("\n");
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}
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}
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ether_print(cp)
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u_char *cp;
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{
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printf("%x:%x:%x:%x:%x:%x", cp[0], cp[1], cp[2], cp[3], cp[4], cp[5]);
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}
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ether_aton(a, n)
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char *a;
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u_char *n;
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{
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int i, o[6];
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i = sscanf(a, "%x:%x:%x:%x:%x:%x", &o[0], &o[1], &o[2],
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&o[3], &o[4], &o[5]);
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if (i != 6) {
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fprintf(stderr, "arp: invalid Ethernet address '%s'\n", a);
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return (1);
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}
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for (i=0; i<6; i++)
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n[i] = o[i];
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return (0);
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}
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usage()
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{
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printf("Usage: arp hostname\n");
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printf(" arp -a [/vmunix] [/dev/kmem]\n");
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printf(" arp -d hostname\n");
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printf(" arp -s hostname ether_addr [temp] [pub] [trail]\n");
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printf(" arp -f filename\n");
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}
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