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- /*
- * Copyright (c) 1984 Regents of the University of California.
- * All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Sun Microsystems, Inc.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 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
- char copyright[] =
- "@(#) Copyright (c) 1984 Regents of the University of California.\n\
- All rights reserved.\n";
- #endif /* not lint */
-
- #ifndef lint
- /*static char sccsid[] = "from: @(#)arp.c 5.11.1.1 (Berkeley) 7/22/91";*/
- static char rcsid[] = "$Id: arp.c,v 1.1 1994/05/23 08:58:37 rzsfl Exp rzsfl $";
- #endif /* not lint */
-
- /*
- * arp - display, set, and delete arp table entries
- */
-
- #include <sys/param.h>
- #include <sys/file.h>
- #include <sys/socket.h>
- #include <sys/ioctl.h>
-
- #include <netdb.h>
- #include <netinet/in.h>
- #include <net/if.h>
- #include <linux/if_ether.h>
-
- #include <errno.h>
- #include <stdio.h>
- #include <paths.h>
-
- extern int errno;
-
- main(argc, argv)
- int argc;
- char **argv;
- {
- int ch;
-
- while ((ch = getopt(argc, argv, "adsf")) != EOF)
- switch((char)ch) {
- case 'a': {
- char *mem = 0;
-
- if (argc > 2)
- usage();
- dump();
- exit(0);
- }
- case 'd':
- if (argc != 3)
- usage();
- delete(argv[2]);
- exit(0);
- case 's':
- if (argc < 4 || argc > 7)
- usage();
- exit(set(argc-2, &argv[2]) ? 1 : 0);
- case 'f':
- if (argc != 3)
- usage();
- exit (file(argv[2]) ? 1 : 0);
- case '?':
- default:
- usage();
- }
- if (argc != 2)
- usage();
- get(argv[1]);
- exit(0);
- }
-
- /*
- * Process a file to set standard arp entries
- */
- file(name)
- char *name;
- {
- FILE *fp;
- int i, retval;
- char line[100], arg[5][50], *args[5];
-
- if ((fp = fopen(name, "r")) == NULL) {
- fprintf(stderr, "arp: cannot open %s\n", name);
- exit(1);
- }
- args[0] = &arg[0][0];
- args[1] = &arg[1][0];
- args[2] = &arg[2][0];
- args[3] = &arg[3][0];
- args[4] = &arg[4][0];
- retval = 0;
- while(fgets(line, 100, fp) != NULL) {
- i = sscanf(line, "%s %s %s %s %s", arg[0], arg[1], arg[2],
- arg[3], arg[4]);
- if (i < 2) {
- fprintf(stderr, "arp: bad line: %s\n", line);
- retval = 1;
- continue;
- }
- if (set(i, args))
- retval = 1;
- }
- fclose(fp);
- return (retval);
- }
-
- /*
- * Set an individual arp entry
- */
- set(argc, argv)
- int argc;
- char **argv;
- {
- struct arpreq ar;
- struct hostent *hp;
- struct sockaddr_in *sin;
- u_char *ea;
- int s;
- char *host = argv[0], *eaddr = argv[1];
-
- argc -= 2;
- argv += 2;
- bzero((caddr_t)&ar, sizeof ar);
- sin = (struct sockaddr_in *)&ar.arp_pa;
- sin->sin_family = AF_INET;
- sin->sin_addr.s_addr = inet_addr(host);
- if (sin->sin_addr.s_addr == -1) {
- if (!(hp = gethostbyname(host))) {
- fprintf(stderr, "arp: %s: ", host);
- herror((char *)NULL);
- return (1);
- }
- bcopy((char *)hp->h_addr, (char *)&sin->sin_addr,
- sizeof sin->sin_addr);
- }
- ea = (u_char *)ar.arp_ha.sa_data;
- if (ether_aton(eaddr, ea))
- return (1);
- ar.arp_flags = ATF_PERM|ATF_COM;
- while (argc-- > 0) {
- if (strncmp(argv[0], "temp", 4) == 0)
- ar.arp_flags &= ~ATF_PERM;
- else if (strncmp(argv[0], "pub", 3) == 0)
- ar.arp_flags |= ATF_PUBL;
- else if (strncmp(argv[0], "trail", 5) == 0)
- ar.arp_flags |= ATF_USETRAILERS;
- argv++;
- }
-
- s = socket(AF_INET, SOCK_DGRAM, 0);
- if (s < 0) {
- perror("arp: socket");
- exit(1);
- }
- if (ioctl(s, SIOCSARP, (caddr_t)&ar) < 0) {
- perror(host);
- exit(1);
- }
- close(s);
- return (0);
- }
-
- /*
- * Display an individual arp entry
- */
- get(host)
- char *host;
- {
- struct arpreq ar;
- struct hostent *hp;
- struct sockaddr_in *sin;
- unsigned char *ea;
- int s;
-
- bzero((caddr_t)&ar, sizeof ar);
- ar.arp_pa.sa_family = AF_INET;
- sin = (struct sockaddr_in *)&ar.arp_pa;
- sin->sin_family = AF_INET;
- sin->sin_addr.s_addr = inet_addr(host);
- if ((long)sin->sin_addr.s_addr == -1) {
- if (!(hp = gethostbyname(host))) {
- fprintf(stderr, "arp: %s: ", host);
- herror((char *)NULL);
- exit(1);
- }
- bcopy((char *)hp->h_addr, (char *)&sin->sin_addr,
- sizeof sin->sin_addr);
- }
- s = socket(AF_INET, SOCK_DGRAM, 0);
- if (s < 0) {
- perror("arp: socket");
- exit(1);
- }
- if (ioctl(s, SIOCGARP, (caddr_t)&ar) < 0) {
- if (errno == ENXIO)
- printf("%s (%s) -- no entry\n",
- host, inet_ntoa(sin->sin_addr));
- else
- perror("SIOCGARP");
- exit(1);
- }
- close(s);
- ea = (u_char *)ar.arp_ha.sa_data;
- printf("%s (%s) at ", host, inet_ntoa(sin->sin_addr));
- /* if (ar.arp_flags & ATF_COM)*/
- ether_print(ea);
- /* else
- printf("(incomplete)"); */
- if (ar.arp_flags & ATF_PERM)
- printf(" permanent");
- if (ar.arp_flags & ATF_PUBL)
- printf(" published");
- if (ar.arp_flags & ATF_USETRAILERS)
- printf(" trailers");
- printf("\n");
- }
-
- /*
- * Delete an arp entry
- */
- delete(host)
- char *host;
- {
- struct arpreq ar;
- struct hostent *hp;
- struct sockaddr_in *sin;
- int s;
-
- bzero((caddr_t)&ar, sizeof ar);
- ar.arp_pa.sa_family = AF_INET;
- sin = (struct sockaddr_in *)&ar.arp_pa;
- sin->sin_family = AF_INET;
- sin->sin_addr.s_addr = inet_addr(host);
- if ((long)sin->sin_addr.s_addr == -1) {
- if (!(hp = gethostbyname(host))) {
- fprintf(stderr, "arp: %s: ", host);
- herror((char *)NULL);
- exit(1);
- }
- bcopy((char *)hp->h_addr, (char *)&sin->sin_addr,
- sizeof sin->sin_addr);
- }
- s = socket(AF_INET, SOCK_DGRAM, 0);
- if (s < 0) {
- perror("arp: socket");
- exit(1);
- }
- if (ioctl(s, SIOCDARP, (caddr_t)&ar) < 0) {
- if (errno == ENXIO)
- printf("%s (%s) -- no entry\n",
- host, inet_ntoa(sin->sin_addr));
- else
- perror("SIOCDARP");
- exit(1);
- }
- close(s);
- printf("%s (%s) deleted\n", host, inet_ntoa(sin->sin_addr));
- }
-
-
- /*
- * Dump the entire arp table
- */
-
- static unsigned long getipaddr(struct arpreq *at)
- {
- return (* (long *)(at->arp_pa.sa_data));
- }
-
- dump()
- {
- extern int h_errno;
- struct arpreq *at;
- struct hostent *hp;
- int bynumber, mf, arptab_size, sz;
- int fd;
- const char *host;
-
- sz = 65536;
- at = (struct arpreq *)malloc((u_int)sz);
- if (at == NULL) {
- fputs("arp: can't get memory for arptab.\n", stderr);
- exit(1);
- }
-
- fd=open("/proc/net/arp",O_RDONLY,0);
- if(fd==-1)
- {
- perror("arp: error opening arptab");
- exit(1);
- }
- if((sz=read(fd,at,65536))<0)
- {
- perror("arp: error reading arptab");
- exit(1);
- }
- arptab_size=sz/sizeof(struct arpreq);
- close(fd);
- for (bynumber = 0; arptab_size-- > 0; at++) {
- unsigned long h_ip = getipaddr(at);
- if (bynumber == 0)
- {
- struct in_addr ia;
- ia.s_addr = h_ip;
- hp = gethostbyaddr((const char *)&ia,
- sizeof(ia), AF_INET);
- }
- else
- hp = 0;
- if (hp)
- host = hp->h_name;
- else {
- host = "?";
- if (h_errno == TRY_AGAIN)
- bynumber = 1;
- }
- printf("%s (%s) at ", host, inet_ntoa(h_ip));
- if (at->arp_flags & ATF_COM)
- ether_print(at->arp_ha.sa_data);
- else
- printf("(incomplete)");
- if (at->arp_flags & ATF_PERM)
- printf(" permanent");
- if (at->arp_flags & ATF_PUBL)
- printf(" published");
- if (at->arp_flags & ATF_USETRAILERS)
- printf(" trailers");
- printf("\n");
- }
- }
-
- ether_print(cp)
- u_char *cp;
- {
- printf("%02x:%02x:%02x:%02x:%02x:%02x", cp[0], cp[1], cp[2], cp[3], cp[4], cp[5]);
- }
-
- ether_aton(a, n)
- char *a;
- u_char *n;
- {
- int i, o[6];
-
- i = sscanf(a, "%x:%x:%x:%x:%x:%x", &o[0], &o[1], &o[2],
- &o[3], &o[4], &o[5]);
- if (i != 6) {
- fprintf(stderr, "arp: invalid Ethernet address '%s'\n", a);
- return (1);
- }
- for (i=0; i<6; i++)
- n[i] = o[i];
- return (0);
- }
-
- usage()
- {
- printf("usage: arp hostname\n");
- printf(" arp -a\n");
- printf(" arp -d hostname\n");
- printf(" arp -s hostname ether_addr [temp] [pub] [trail]\n");
- printf(" arp -f filename\n");
- exit(1);
- }
-