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/*
* rarp This file contains an implementation of the command
* that maintains the kernel's RARP cache. It is derived
* from Fred N. van Kempen's arp command.
*
* Version: $Id: rarp.c,v 1.6 2001/04/08 17:05:05 pb Exp $
*
* Usage: rarp -d hostname Delete entry
* rarp -s hostname ethernet_address Add entry
* rarp -a Print entries
* rarp -f Add frop /etc/ethers
*
* Rewritten: Phil Blundell <Philip.Blundell@pobox.com> 1997-08-03
* gettext instead of catgets: Arnaldo Carvalho de Melo <acme@conectiva.com.br> 1998-06-29
* 1998-01-01 Bernd Eckenfels reorganised usage()
* 2001-04-04 Arnaldo Carvalho de Melo - use setlocale
*
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>
#define DFLT_HW "ether"
#include "config.h"
#include "intl.h"
#include "net-support.h"
#include "version.h"
#include "pathnames.h"
static char no_rarp_message[] = N_("This kernel does not support RARP.\n");
static char version_string[] = RELEASE "\nrarp 1.03 (2001-04-04)\n";
static struct hwtype *hardware = NULL;
/* Delete an entry from the RARP cache. */
static int rarp_delete(int fd, struct hostent *hp)
{
struct arpreq req;
struct sockaddr_in *si;
unsigned int found = 0;
char **addr;
/* The host can have more than one address, so we loop on them. */
for (addr = hp->h_addr_list; *addr != NULL; addr++) {
memset((char *) &req, 0, sizeof(req));
si = (struct sockaddr_in *) &req.arp_pa;
si->sin_family = hp->h_addrtype;
memcpy((char *) &si->sin_addr, *addr, hp->h_length);
/* Call the kernel. */
if (ioctl(fd, SIOCDRARP, &req) == 0) {
found++;
} else {
switch (errno) {
case ENXIO:
break;
case ENODEV:
fputs(_(no_rarp_message), stderr);
return 1;
default:
perror("SIOCDRARP");
return 1;
}
}
}
if (found == 0)
printf(_("no RARP entry for %s.\n"), hp->h_name);
return 0;
}
/* Set an entry in the RARP cache. */
static int rarp_set(int fd, struct hostent *hp, char *hw_addr)
{
struct arpreq req;
struct sockaddr_in *si;
struct sockaddr sap;
if (hardware->input(hw_addr, &sap)) {
fprintf(stderr, _("%s: bad hardware address\n"), hw_addr);
return 1;
}
/* Clear and fill in the request block. */
memset((char *) &req, 0, sizeof(req));
si = (struct sockaddr_in *) &req.arp_pa;
si->sin_family = hp->h_addrtype;
memcpy((char *) &si->sin_addr, hp->h_addr_list[0], hp->h_length);
req.arp_ha.sa_family = hardware->type;
memcpy(req.arp_ha.sa_data, sap.sa_data, hardware->alen);
/* Call the kernel. */
if (ioctl(fd, SIOCSRARP, &req) < 0) {
if (errno == ENODEV)
fputs(_(no_rarp_message), stderr);
else
perror("SIOCSRARP");
return 1;
}
return 0;
}
/* Process an EtherFile */
static int rarp_file(int fd, const char *name)
{
char buff[1024];
char *host, *addr;
int linenr;
FILE *fp;
struct hostent *hp;
if ((fp = fopen(name, "r")) == NULL) {
fprintf(stderr, _("rarp: cannot open file %s:%s.\n"), name, strerror(errno));
return -1;
}
/* Read the lines in the file. */
linenr = 0;
while (fgets(buff, sizeof(buff), fp)) {
++linenr;
if (buff[0] == '#' || buff[0] == '\0')
continue;
if ((addr = strtok(buff, "\n \t")) == NULL)
continue;
if ((host = strtok(NULL, "\n \t")) == NULL) {
fprintf(stderr, _("rarp: format error at %s:%u\n"), name, linenr);
continue;
}
if ((hp = gethostbyname(host)) == NULL) {
fprintf(stderr, _("rarp: %s: unknown host\n"), host);
}
if (rarp_set(fd, hp, addr) != 0) {
fprintf(stderr, _("rarp: cannot set entry from %s:%u\n"), name, linenr);
}
}
(void) fclose(fp);
return 0;
}
static int display_cache(void)
{
FILE *fd = fopen(_PATH_PROCNET_RARP, "r");
char buffer[256];
if (fd == NULL) {
if (errno == ENOENT)
fputs(_(no_rarp_message), stderr);
else
perror(_PATH_PROCNET_RARP);
return 1;
}
while (feof(fd) == 0) {
if (fgets(buffer, 255, fd))
fputs(buffer, stdout);
}
fclose(fd);
return 0;
}
static void usage(void)
{
fprintf(stderr, _("Usage: rarp -a list entries in cache.\n"));
fprintf(stderr, _(" rarp -d <hostname> delete entry from cache.\n"));
fprintf(stderr, _(" rarp [<HW>] -s <hostname> <hwaddr> add entry to cache.\n"));
fprintf(stderr, _(" rarp -f add entries from /etc/ethers.\n"));
fprintf(stderr, _(" rarp -V display program version.\n\n"));
fprintf(stderr, _(" <HW>=Use '-H <hw>' to specify hardware address type. Default: %s\n"), DFLT_HW);
fprintf(stderr, _(" List of possible hardware types (which support ARP):\n"));
print_hwlist(1); /* 1 = ARPable */
exit(E_USAGE);
}
#define MODE_DISPLAY 1
#define MODE_DELETE 2
#define MODE_SET 3
#define MODE_ETHERS 4
static struct option longopts[] =
{
{"version", 0, NULL, 'V'},
{"verbose", 0, NULL, 'v'},
{"list", 0, NULL, 'a'},
{"set", 0, NULL, 's'},
{"delete", 0, NULL, 'd'},
{"help", 0, NULL, 'h'},
{NULL, 0, NULL, 0}
};
int main(int argc, char **argv)
{
int result = 0, mode = 0, c, nargs = 0, verbose = 0;
char *args[3];
struct hostent *hp;
int fd;
#if I18N
setlocale (LC_ALL, "");
bindtextdomain("net-tools", "/usr/share/locale");
textdomain("net-tools");
#endif
/* Get a default hardware type. */
hardware = get_hwtype(DFLT_HW);
do {
c = getopt_long(argc, argv, "-ht:aHdsVvf", longopts, NULL);
switch (c) {
case EOF:
break;
case 'h':
usage();
case 'V':
fprintf(stderr, version_string);
exit(E_VERSION);
break;
case 'v':
verbose++;
break;
case 'a':
case 's':
case 'd':
if (mode) {
fprintf(stderr, _("%s: illegal option mix.\n"), argv[0]);
usage();
} else {
mode = (c == 'a' ? MODE_DISPLAY : (c == 'd' ? MODE_DELETE : MODE_SET));
}
break;
case 'f':
mode = MODE_ETHERS;
break;
case 'H':
case 't':
if (optarg) {
hardware = get_hwtype(optarg);
} else {
usage();
}
break;
case 1:
if (nargs == 2) {
usage();
exit(1);
} else {
args[nargs++] = optarg;
}
break;
default:
usage();
}
} while (c != EOF);
if (hardware == NULL) {
fprintf(stderr, _("rarp: %s: unknown hardware type.\n"), optarg);
exit(1);
}
switch (mode) {
case 0:
usage();
case MODE_DISPLAY:
if (nargs != (mode - 1)) {
usage();
}
result = display_cache();
break;
case MODE_DELETE:
case MODE_SET:
if (nargs != (mode - 1)) {
usage();
}
if ((hp = gethostbyname(args[0])) == NULL) {
fprintf(stderr, _("rarp: %s: unknown host\n"), args[0]);
exit(1);
}
if (fd = socket(PF_INET, SOCK_DGRAM, 0), fd < 0) {
perror("socket");
exit(1);
}
result = (mode == MODE_DELETE) ? rarp_delete(fd, hp) : rarp_set(fd, hp, args[1]);
close(fd);
break;
case MODE_ETHERS:
if (nargs != 0 && nargs != 1)
usage();
if (fd = socket(PF_INET, SOCK_DGRAM, 0), fd < 0) {
perror("socket");
exit(1);
}
result = rarp_file(fd, nargs ? args[0] : _PATH_ETHERS);
close(fd);
}
exit(result);
}
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