410 lines
9.5 KiB
C
410 lines
9.5 KiB
C
/*
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* Copyright (c) 1984 Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Sun Microsystems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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char copyright[] =
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"@(#) Copyright (c) 1984 Regents of the University of California.\n\
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All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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/*static char sccsid[] = "from: @(#)arp.c 5.11.1.1 (Berkeley) 7/22/91";*/
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static char rcsid[] = "$Id: arp.c,v 1.4 1993/12/25 02:28:46 deraadt Exp $";
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#endif /* not lint */
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/*
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* arp - display, set, and delete arp table entries
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*/
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#include <sys/param.h>
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#include <sys/file.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <net/if.h>
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#include <netinet/if_ether.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <nlist.h>
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#include <kvm.h>
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#include <stdio.h>
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#include <paths.h>
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extern int errno;
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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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int ch;
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while ((ch = getopt(argc, argv, "adsf")) != EOF)
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switch((char)ch) {
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case 'a': {
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char *mem = 0;
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if (argc > 4)
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usage();
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if (argc == 4) {
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mem = argv[3];
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}
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dump((argc >= 3) ? argv[2] : _PATH_UNIX, mem);
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exit(0);
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}
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case 'd':
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if (argc != 3)
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usage();
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delete(argv[2]);
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exit(0);
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case 's':
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if (argc < 4 || argc > 7)
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usage();
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exit(set(argc-2, &argv[2]) ? 1 : 0);
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case 'f':
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if (argc != 3)
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usage();
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exit (file(argv[2]) ? 1 : 0);
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case '?':
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default:
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usage();
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}
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if (argc != 2)
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usage();
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get(argv[1]);
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exit(0);
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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, retval;
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char line[100], arg[5][50], *args[5];
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setregid(getegid(), getgid());
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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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setregid(getegid(), getgid());
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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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int argc;
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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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if (!(hp = gethostbyname(host))) {
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fprintf(stderr, "arp: %s: ", host);
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herror((char *)NULL);
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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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else if (strncmp(argv[0], "pub", 3) == 0)
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ar.arp_flags |= ATF_PUBL;
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else 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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if (!(hp = gethostbyname(host))) {
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fprintf(stderr, "arp: %s: ", host);
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herror((char *)NULL);
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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)
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printf(" permanent");
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if (ar.arp_flags & ATF_PUBL)
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printf(" published");
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if (ar.arp_flags & ATF_USETRAILERS)
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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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if (!(hp = gethostbyname(host))) {
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fprintf(stderr, "arp: %s: ", host);
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herror((char *)NULL);
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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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extern int h_errno;
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struct arptab *at;
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struct hostent *hp;
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int bynumber, mf, arptab_size, sz;
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char *host, *malloc();
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off_t lseek();
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if (kvm_openfiles(kernel, mem, NULL) == -1) {
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fprintf(stderr, "arp: kvm_openfiles: %s\n", kvm_geterr());
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exit(1);
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}
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if (kvm_nlist(nl) < 0 || 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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if (kvm_read((void *)(nl[X_ARPTAB_SIZE].n_value),
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&arptab_size, sizeof arptab_size) == -1 ||
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arptab_size <= 0 || arptab_size > 1000) {
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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((u_int)sz);
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if (at == NULL) {
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fputs("arp: can't get memory for arptab.\n", stderr);
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exit(1);
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}
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if (kvm_read((void *)(nl[X_ARPTAB].n_value), (char *)at, sz) == -1) {
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perror("arp: error reading arptab");
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exit(1);
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}
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for (bynumber = 0; 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)
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printf(" permanent");
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if (at->at_flags & ATF_PUBL)
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printf(" published");
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if (at->at_flags & ATF_USETRAILERS)
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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 [kernel] [kernel_memory]\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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exit(1);
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}
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