/* * 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 lintstatic const char rcsid[] _U_ =    "@(#) $Header: /tcpdump/master/tcpdump/print-arp.c,v 1.66 2006-03-03 22:53:21 hannes Exp $ (LBL)";#endif#ifdef HAVE_CONFIG_H#include "config.h"#endif#include <tcpdump-stdinc.h>#include <stdio.h>#include <string.h>#include "netdissect.h"#include "addrtoname.h"#include "ether.h"#include "ethertype.h"#include "extract.h"			/* must come after interface.h *//* * Address Resolution Protocol. * * See RFC 826 for protocol description.  ARP packets are variable * in size; the arphdr structure defines the fixed-length portion. * Protocol type values are the same as those for 10 Mb/s Ethernet. * It is followed by the variable-sized fields ar_sha, arp_spa, * arp_tha and arp_tpa in that order, according to the lengths * specified.  Field names used correspond to RFC 826. */struct  arp_pkthdr {        u_short ar_hrd;         /* format of hardware address */#define ARPHRD_ETHER    1       /* ethernet hardware format */#define ARPHRD_IEEE802  6       /* token-ring hardware format */#define ARPHRD_ARCNET   7       /* arcnet hardware format */#define ARPHRD_FRELAY   15      /* frame relay hardware format */#define ARPHRD_ATM2225  19      /* ATM (RFC 2225) */#define ARPHRD_STRIP    23      /* Ricochet Starmode Radio hardware format */#define ARPHRD_IEEE1394 24      /* IEEE 1394 (FireWire) hardware format */        u_short ar_pro;         /* format of protocol address */        u_char  ar_hln;         /* length of hardware address */        u_char  ar_pln;         /* length of protocol address */        u_short ar_op;          /* one of: */#define ARPOP_REQUEST   1       /* request to resolve address */#define ARPOP_REPLY     2       /* response to previous request */#define ARPOP_REVREQUEST 3      /* request protocol address given hardware */#define ARPOP_REVREPLY  4       /* response giving protocol address */#define ARPOP_INVREQUEST 8      /* request to identify peer */#define ARPOP_INVREPLY  9       /* response identifying peer */#define ARPOP_NAK       10      /* NAK - only valif for ATM ARP *//* * The remaining fields are variable in size, * according to the sizes above. */#ifdef COMMENT_ONLY	u_char	ar_sha[];	/* sender hardware address */	u_char	ar_spa[];	/* sender protocol address */	u_char	ar_tha[];	/* target hardware address */	u_char	ar_tpa[];	/* target protocol address */#endif#define ar_sha(ap)	(((const u_char *)((ap)+1))+0)#define ar_spa(ap)	(((const u_char *)((ap)+1))+  (ap)->ar_hln)#define ar_tha(ap)	(((const u_char *)((ap)+1))+  (ap)->ar_hln+(ap)->ar_pln)#define ar_tpa(ap)	(((const u_char *)((ap)+1))+2*(ap)->ar_hln+(ap)->ar_pln)};#define ARP_HDRLEN	8#define HRD(ap) EXTRACT_16BITS(&(ap)->ar_hrd)#define HRD_LEN(ap) ((ap)->ar_hln)#define PROTO_LEN(ap) ((ap)->ar_pln)#define OP(ap)  EXTRACT_16BITS(&(ap)->ar_op)#define PRO(ap) EXTRACT_16BITS(&(ap)->ar_pro)#define SHA(ap) (ar_sha(ap))#define SPA(ap) (ar_spa(ap))#define THA(ap) (ar_tha(ap))#define TPA(ap) (ar_tpa(ap))struct tok arpop_values[] = {    { ARPOP_REQUEST, "Request" },    { ARPOP_REPLY, "Reply" },    { ARPOP_REVREQUEST, "Reverse Request" },    { ARPOP_REVREPLY, "Reverse Reply" },    { ARPOP_INVREQUEST, "Inverse Request" },    { ARPOP_INVREPLY, "Inverse Reply" },    { ARPOP_NAK, "NACK Reply" },    { 0, NULL }};struct tok arphrd_values[] = {    { ARPHRD_ETHER, "Ethernet" },    { ARPHRD_IEEE802, "TokenRing" },    { ARPHRD_ARCNET, "ArcNet" },    { ARPHRD_FRELAY, "FrameRelay" },    { ARPHRD_STRIP, "Strip" },    { ARPHRD_IEEE1394, "IEEE 1394" },    { ARPHRD_ATM2225, "ATM" },    { 0, NULL }};/* * ATM Address Resolution Protocol. * * See RFC 2225 for protocol description.  ATMARP packets are similar * to ARP packets, except that there are no length fields for the * protocol address - instead, there are type/length fields for * the ATM number and subaddress - and the hardware addresses consist * of an ATM number and an ATM subaddress. */struct  atmarp_pkthdr {        u_short aar_hrd;        /* format of hardware address */        u_short aar_pro;        /* format of protocol address */        u_char  aar_shtl;       /* length of source ATM number */        u_char  aar_sstl;       /* length of source ATM subaddress */#define ATMARP_IS_E164  0x40    /* bit in type/length for E.164 format */#define ATMARP_LEN_MASK 0x3F    /* length of {sub}address in type/length */        u_short aar_op;         /* same as regular ARP */        u_char  aar_spln;       /* length of source protocol address */        u_char  aar_thtl;       /* length of target ATM number */        u_char  aar_tstl;       /* length of target ATM subaddress */        u_char  aar_tpln;       /* length of target protocol address *//* * The remaining fields are variable in size, * according to the sizes above. */#ifdef COMMENT_ONLY	u_char	aar_sha[];	/* source ATM number */	u_char	aar_ssa[];	/* source ATM subaddress */	u_char	aar_spa[];	/* sender protocol address */	u_char	aar_tha[];	/* target ATM number */	u_char	aar_tsa[];	/* target ATM subaddress */	u_char	aar_tpa[];	/* target protocol address */#endif#define ATMHRD(ap)  EXTRACT_16BITS(&(ap)->aar_hrd)#define ATMSHRD_LEN(ap) ((ap)->aar_shtl & ATMARP_LEN_MASK)#define ATMSSLN(ap) ((ap)->aar_sstl & ATMARP_LEN_MASK)#define ATMSPROTO_LEN(ap) ((ap)->aar_spln)#define ATMOP(ap)   EXTRACT_16BITS(&(ap)->aar_op)#define ATMPRO(ap)  EXTRACT_16BITS(&(ap)->aar_pro)#define ATMTHRD_LEN(ap) ((ap)->aar_thtl & ATMARP_LEN_MASK)#define ATMTSLN(ap) ((ap)->aar_tstl & ATMARP_LEN_MASK)#define ATMTPROTO_LEN(ap) ((ap)->aar_tpln)#define aar_sha(ap)	((const u_char *)((ap)+1))#define aar_ssa(ap)	(aar_sha(ap) + ATMSHRD_LEN(ap))#define aar_spa(ap)	(aar_ssa(ap) + ATMSSLN(ap))#define aar_tha(ap)	(aar_spa(ap) + ATMSPROTO_LEN(ap))#define aar_tsa(ap)	(aar_tha(ap) + ATMTHRD_LEN(ap))#define aar_tpa(ap)	(aar_tsa(ap) + ATMTSLN(ap))};#define ATMSHA(ap) (aar_sha(ap))#define ATMSSA(ap) (aar_ssa(ap))#define ATMSPA(ap) (aar_spa(ap))#define ATMTHA(ap) (aar_tha(ap))#define ATMTSA(ap) (aar_tsa(ap))#define ATMTPA(ap) (aar_tpa(ap))static u_char ezero[6];static voidatmarp_addr_print(netdissect_options *ndo,		  const u_char *ha, u_int ha_len, const u_char *srca,    u_int srca_len){	if (ha_len == 0)		ND_PRINT((ndo, "<No address>"));	else {		ND_PRINT((ndo, "%s", linkaddr_string(ha, LINKADDR_ATM, ha_len)));		if (srca_len != 0) 			ND_PRINT((ndo, ",%s",				  linkaddr_string(srca, LINKADDR_ATM, srca_len)));	}}static voidatmarp_print(netdissect_options *ndo,	     const u_char *bp, u_int length, u_int caplen){	const struct atmarp_pkthdr *ap;	u_short pro, hrd, op;	ap = (const struct atmarp_pkthdr *)bp;	ND_TCHECK(*ap);	hrd = ATMHRD(ap);	pro = ATMPRO(ap);	op = ATMOP(ap);	if (!ND_TTEST2(*aar_tpa(ap), ATMTPROTO_LEN(ap))) {		ND_PRINT((ndo, "[|ARP]"));		ND_DEFAULTPRINT((const u_char *)ap, length);		return;	}        if (!ndo->ndo_eflag) {            ND_PRINT((ndo, "ARP, "));        }	if ((pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL) ||	    ATMSPROTO_LEN(ap) != 4 ||            ATMTPROTO_LEN(ap) != 4 ||            ndo->ndo_vflag) {                ND_PRINT((ndo, "%s, %s (len %u/%u)",                          tok2str(arphrd_values, "Unknown Hardware (%u)", hrd),                          tok2str(ethertype_values, "Unknown Protocol (0x%04x)", pro),                          ATMSPROTO_LEN(ap),                          ATMTPROTO_LEN(ap)));                /* don't know know about the address formats */                if (!ndo->ndo_vflag) {                    goto out;                }	}        /* print operation */        printf("%s%s ",               ndo->ndo_vflag ? ", " : "",                tok2str(arpop_values, "Unknown (%u)", op));	switch (op) {	case ARPOP_REQUEST:		ND_PRINT((ndo, "who-has %s", ipaddr_string(ATMTPA(ap))));		if (ATMTHRD_LEN(ap) != 0) {			ND_PRINT((ndo, " ("));			atmarp_addr_print(ndo, ATMTHA(ap), ATMTHRD_LEN(ap),			    ATMTSA(ap), ATMTSLN(ap));			ND_PRINT((ndo, ")"));		}		ND_PRINT((ndo, "tell %s", ipaddr_string(ATMSPA(ap))));		break;	case ARPOP_REPLY:		ND_PRINT((ndo, "%s is-at ", ipaddr_string(ATMSPA(ap))));		atmarp_addr_print(ndo, ATMSHA(ap), ATMSHRD_LEN(ap), ATMSSA(ap),                                  ATMSSLN(ap));		break;	case ARPOP_INVREQUEST:		ND_PRINT((ndo, "who-is "));		atmarp_addr_print(ndo, ATMTHA(ap), ATMTHRD_LEN(ap), ATMTSA(ap),		    ATMTSLN(ap));		ND_PRINT((ndo, " tell "));		atmarp_addr_print(ndo, ATMSHA(ap), ATMSHRD_LEN(ap), ATMSSA(ap),		    ATMSSLN(ap));		break;	case ARPOP_INVREPLY:		atmarp_addr_print(ndo, ATMSHA(ap), ATMSHRD_LEN(ap), ATMSSA(ap),		    ATMSSLN(ap));		ND_PRINT((ndo, "at %s", ipaddr_string(ATMSPA(ap))));		break;	case ARPOP_NAK:		ND_PRINT((ndo, "for %s", ipaddr_string(ATMSPA(ap))));		break;	default:		ND_DEFAULTPRINT((const u_char *)ap, caplen);		return;	} out:        ND_PRINT((ndo, ", length %u", length));        return;trunc:	ND_PRINT((ndo, "[|ARP]"));}voidarp_print(netdissect_options *ndo,	  const u_char *bp, u_int length, u_int caplen){	const struct arp_pkthdr *ap;	u_short pro, hrd, op, linkaddr;	ap = (const struct arp_pkthdr *)bp;	ND_TCHECK(*ap);	hrd = HRD(ap);	pro = PRO(ap);	op = OP(ap);                /* if its ATM then call the ATM ARP printer           for Frame-relay ARP most of the fields           are similar to Ethernet so overload the Ethernet Printer           and set the linkaddr type for linkaddr_string() accordingly */        switch(hrd) {        case ARPHRD_ATM2225:            atmarp_print(ndo, bp, length, caplen);            return;        case ARPHRD_FRELAY:            linkaddr = LINKADDR_FRELAY;        default:            linkaddr = LINKADDR_ETHER;            break;	}	if (!ND_TTEST2(*ar_tpa(ap), PROTO_LEN(ap))) {		ND_PRINT((ndo, "[|ARP]"));		ND_DEFAULTPRINT((const u_char *)ap, length);		return;	}        if (!ndo->ndo_eflag) {            ND_PRINT((ndo, "ARP, "));        }        /* print hardware type/len and proto type/len */        if ((pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL) ||	    PROTO_LEN(ap) != 4 ||            HRD_LEN(ap) == 0 ||            ndo->ndo_vflag) {            ND_PRINT((ndo, "%s (len %u), %s (len %u)",                      tok2str(arphrd_values, "Unknown Hardware (%u)", hrd),                      HRD_LEN(ap),                      tok2str(ethertype_values, "Unknown Protocol (0x%04x)", pro),                      PROTO_LEN(ap)));            /* don't know know about the address formats */            if (!ndo->ndo_vflag) {                goto out;            }	}        /* print operation */        printf("%s%s ",               ndo->ndo_vflag ? ", " : "",                tok2str(arpop_values, "Unknown (%u)", op));	switch (op) {	case ARPOP_REQUEST:		ND_PRINT((ndo, "who-has %s", ipaddr_string(TPA(ap))));		if (memcmp((const char *)ezero, (const char *)THA(ap), HRD_LEN(ap)) != 0)			ND_PRINT((ndo, " (%s)",				  linkaddr_string(THA(ap), linkaddr, HRD_LEN(ap))));		ND_PRINT((ndo, " tell %s", ipaddr_string(SPA(ap))));		break;	case ARPOP_REPLY:		ND_PRINT((ndo, "%s is-at %s",                          ipaddr_string(SPA(ap)),                          linkaddr_string(SHA(ap), linkaddr, HRD_LEN(ap))));		break;	case ARPOP_REVREQUEST:		ND_PRINT((ndo, "who-is %s tell %s",			  linkaddr_string(THA(ap), linkaddr, HRD_LEN(ap)),			  linkaddr_string(SHA(ap), linkaddr, HRD_LEN(ap))));		break;	case ARPOP_REVREPLY:		ND_PRINT((ndo, "%s at %s",			  linkaddr_string(THA(ap), linkaddr, HRD_LEN(ap)),			  ipaddr_string(TPA(ap))));		break;	case ARPOP_INVREQUEST:		ND_PRINT((ndo, "who-is %s tell %s",			  linkaddr_string(THA(ap), linkaddr, HRD_LEN(ap)),			  linkaddr_string(SHA(ap), linkaddr, HRD_LEN(ap))));		break;	case ARPOP_INVREPLY:		ND_PRINT((ndo,"%s at %s",			  linkaddr_string(THA(ap), linkaddr, HRD_LEN(ap)),			  ipaddr_string(TPA(ap))));		break;	default:		ND_DEFAULTPRINT((const u_char *)ap, caplen);		return;	} out:        ND_PRINT((ndo, ", length %u", length));	return;trunc:	ND_PRINT((ndo, "[|ARP]"));}/* * Local Variables: * c-style: bsd * End: */