diff options
Diffstat (limited to 'contrib/tcpdump/print-arp.c')
| -rw-r--r-- | contrib/tcpdump/print-arp.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/contrib/tcpdump/print-arp.c b/contrib/tcpdump/print-arp.c new file mode 100644 index 0000000..c7578fe --- /dev/null +++ b/contrib/tcpdump/print-arp.c @@ -0,0 +1,134 @@ +/* + * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 + * 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 const char rcsid[] = + "@(#) $Header: print-arp.c,v 1.43 97/06/15 13:20:27 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 <net/if_var.h> + +#include <netinet/in.h> +#include <netinet/if_ether.h> + +#ifdef HAVE_MEMORY_H +#include <memory.h> +#endif +#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", hrd); +} |
