home *** CD-ROM | disk | FTP | other *** search
- /*
- * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
- * 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.
- */
-
- #ifndef lint
- static char rcsid[] =
- "@(#) $Header: print-arp.c,v 1.39 96/07/17 14:56:17 leres Exp $ (LBL)";
- #endif
-
- #include <sys/param.h>
- #include <sys/time.h>
- #include <sys/socket.h>
-
- #if __STDC__
- struct mbuf;
- struct rtentry;
- #endif
- #include <net/if.h>
-
- #include <netinet/in.h>
- #include <netinet/if_ether.h>
-
- #include <stdio.h>
- #include <string.h>
-
- #include "interface.h"
- #include "addrtoname.h"
- #include "ethertype.h"
- #include "extract.h" /* must come after interface.h */
-
- /* Compatibility */
- #ifndef REVARP_REQUEST
- #define REVARP_REQUEST 3
- #endif
- #ifndef REVARP_REPLY
- #define REVARP_REPLY 4
- #endif
-
- static u_char ezero[6];
-
- void
- arp_print(register const u_char *bp, u_int length, u_int caplen)
- {
- register const struct ether_arp *ap;
- register const struct ether_header *eh;
- register u_short pro, hrd, op;
-
- ap = (struct ether_arp *)bp;
- if ((u_char *)(ap + 1) > snapend) {
- printf("[|arp]");
- return;
- }
- if (length < sizeof(struct ether_arp)) {
- (void)printf("truncated-arp");
- default_print((u_char *)ap, length);
- return;
- }
-
- pro = EXTRACT_16BITS(&ap->arp_pro);
- hrd = EXTRACT_16BITS(&ap->arp_hrd);
- op = EXTRACT_16BITS(&ap->arp_op);
-
- if ((pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL)
- || ap->arp_hln != sizeof(SHA(ap))
- || ap->arp_pln != sizeof(SPA(ap))) {
- (void)printf("arp-#%d for proto #%d (%d) hardware #%d (%d)",
- op, pro, ap->arp_pln,
- hrd, ap->arp_hln);
- return;
- }
- if (pro == ETHERTYPE_TRAIL)
- (void)printf("trailer-");
- eh = (struct ether_header *)packetp;
- switch (op) {
-
- case ARPOP_REQUEST:
- (void)printf("arp who-has %s", ipaddr_string(TPA(ap)));
- if (memcmp((char *)ezero, (char *)THA(ap), 6) != 0)
- (void)printf(" (%s)", etheraddr_string(THA(ap)));
- (void)printf(" tell %s", ipaddr_string(SPA(ap)));
- if (memcmp((char *)ESRC(eh), (char *)SHA(ap), 6) != 0)
- (void)printf(" (%s)", etheraddr_string(SHA(ap)));
- break;
-
- case ARPOP_REPLY:
- (void)printf("arp reply %s", ipaddr_string(SPA(ap)));
- if (memcmp((char *)ESRC(eh), (char *)SHA(ap), 6) != 0)
- (void)printf(" (%s)", etheraddr_string(SHA(ap)));
- (void)printf(" is-at %s", etheraddr_string(SHA(ap)));
- if (memcmp((char *)EDST(eh), (char *)THA(ap), 6) != 0)
- (void)printf(" (%s)", etheraddr_string(THA(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", op);
- default_print((u_char *)ap, caplen);
- return;
- }
- if (hrd != ARPHRD_ETHER)
- printf(" hardware #%d", ap->arp_hrd);
- }
-