NetBSD/usr.sbin/tcpdump/print-arp.c

103 lines
2.9 KiB
C

/*
* Copyright (c) 1988-1990 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $Id: print-arp.c,v 1.1 1993/11/14 21:20:32 deraadt Exp $
*/
#ifndef lint
static char rcsid[] =
"@(#) Header: print-arp.c,v 1.16 91/04/19 10:45:56 mccanne Exp (LBL)";
#endif
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include "interface.h"
#include "addrtoname.h"
void
arp_print(ap, length, caplen)
register struct ether_arp *ap;
int length;
int caplen;
{
if ((u_char *)(ap + 1) > snapend) {
printf("[|arp]");
return;
}
if (length < sizeof(struct ether_arp)) {
(void)printf("truncated-arp");
default_print((u_short *)ap, length);
return;
}
NTOHS(ap->arp_hrd);
NTOHS(ap->arp_pro);
NTOHS(ap->arp_op);
if (ap->arp_hrd != ARPHRD_ETHER
|| (ap->arp_pro != ETHERTYPE_IP
&& ap->arp_pro != ETHERTYPE_TRAIL)
|| ap->arp_hln != sizeof(SHA(ap))
|| ap->arp_pln != sizeof(SPA(ap))) {
(void)printf("arp-req #%d for proto #%d (%d) hardware %d (%d)",
ap->arp_op, ap->arp_pro, ap->arp_pln,
ap->arp_hrd, ap->arp_hln);
return;
}
if (ap->arp_pro == ETHERTYPE_TRAIL)
(void)printf("trailer");
switch (ap->arp_op) {
case ARPOP_REQUEST:
(void)printf("arp who-has %s tell %s",
ipaddr_string(TPA(ap)),
ipaddr_string(SPA(ap)));
break;
case ARPOP_REPLY:
(void)printf("arp reply %s is-at %s",
ipaddr_string(SPA(ap)),
etheraddr_string(SHA(ap)));
break;
case REVARP_REQUEST:
(void)printf("rarp who-is %s tell %s",
etheraddr_string(THA(ap)),
etheraddr_string(SHA(ap)));
break;
case REVARP_REPLY:
(void)printf("rarp reply %s at %s",
etheraddr_string(THA(ap)),
ipaddr_string(TPA(ap)));
break;
default:
(void)printf("arp-%d", ap->arp_op);
default_print((u_short *)ap, caplen);
break;
}
}