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141 lines
4.0 KiB
C
141 lines
4.0 KiB
C
/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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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: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $FreeBSD$
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/tcpdump/print-arp.c,v 1.44 1999/11/21 09:36:48 fenner Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#if __STDC__
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struct mbuf;
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struct rtentry;
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#endif
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#include <net/if.h>
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#include <net/if_var.h>
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#include <netinet/in.h>
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#include <netinet/if_ether.h>
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#ifdef HAVE_MEMORY_H
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#include <memory.h>
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#endif
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#include <stdio.h>
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#include <string.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "ethertype.h"
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#include "extract.h" /* must come after interface.h */
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/* Compatibility */
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#ifndef REVARP_REQUEST
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#define REVARP_REQUEST 3
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#endif
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#ifndef REVARP_REPLY
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#define REVARP_REPLY 4
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#endif
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static u_char ezero[6];
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void
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arp_print(register const u_char *bp, u_int length, u_int caplen)
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{
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register const struct ether_arp *ap;
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register const struct ether_header *eh;
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register u_short pro, hrd, op;
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ap = (struct ether_arp *)bp;
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if ((u_char *)(ap + 1) > snapend) {
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printf("[|arp]");
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return;
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}
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if (length < sizeof(struct ether_arp)) {
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(void)printf("truncated-arp");
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default_print((u_char *)ap, length);
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return;
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}
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pro = EXTRACT_16BITS(&ap->arp_pro);
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hrd = EXTRACT_16BITS(&ap->arp_hrd);
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op = EXTRACT_16BITS(&ap->arp_op);
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if ((pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL)
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|| ap->arp_hln != sizeof(SHA(ap))
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|| ap->arp_pln != sizeof(SPA(ap))) {
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(void)printf("arp-#%d for proto #%d (%d) hardware #%d (%d)",
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op, pro, ap->arp_pln,
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hrd, ap->arp_hln);
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return;
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}
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if (pro == ETHERTYPE_TRAIL)
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(void)printf("trailer-");
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eh = (struct ether_header *)packetp;
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switch (op) {
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case ARPOP_REQUEST:
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(void)printf("arp who-has %s", ipaddr_string(TPA(ap)));
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if (memcmp((char *)ezero, (char *)THA(ap), 6) != 0)
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(void)printf(" (%s)", etheraddr_string(THA(ap)));
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(void)printf(" tell %s", ipaddr_string(SPA(ap)));
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if (memcmp((char *)ESRC(eh), (char *)SHA(ap), 6) != 0)
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(void)printf(" (%s)", etheraddr_string(SHA(ap)));
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break;
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case ARPOP_REPLY:
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(void)printf("arp reply %s", ipaddr_string(SPA(ap)));
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if (memcmp((char *)ESRC(eh), (char *)SHA(ap), 6) != 0)
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(void)printf(" (%s)", etheraddr_string(SHA(ap)));
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(void)printf(" is-at %s", etheraddr_string(SHA(ap)));
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if (memcmp((char *)EDST(eh), (char *)THA(ap), 6) != 0)
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(void)printf(" (%s)", etheraddr_string(THA(ap)));
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break;
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case REVARP_REQUEST:
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(void)printf("rarp who-is %s tell %s",
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etheraddr_string(THA(ap)),
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etheraddr_string(SHA(ap)));
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break;
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case REVARP_REPLY:
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(void)printf("rarp reply %s at %s",
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etheraddr_string(THA(ap)),
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ipaddr_string(TPA(ap)));
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break;
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default:
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(void)printf("arp-#%d", op);
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default_print((u_char *)ap, caplen);
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return;
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}
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if (hrd != ARPHRD_ETHER)
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printf(" hardware #%d", hrd);
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}
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