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/* $OpenBSD: print-arp.c,v 1.15 2015/11/18 15:36:20 mmcc Exp $ */ |
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/* |
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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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#include <sys/time.h> |
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#include <sys/socket.h> |
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struct mbuf; |
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struct rtentry; |
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#include <net/if.h> |
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#include <netinet/in.h> |
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#include <netinet/if_ether.h> |
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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(const u_char *bp, u_int length, u_int caplen) |
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{ |
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const struct ether_arp *ap; |
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const struct ether_header *eh; |
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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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} |