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tcpdump/print-arp.c
mcr fc80a87e4c NDO-ized print-arp.c
2004-04-30 16:42:14 +00:00

342 lines
10 KiB
C
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/*
* 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[] _U_ =
"@(#) $Header: /tcpdump/master/tcpdump/print-arp.c,v 1.64 2004-04-30 16:42:14 mcr 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_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 */
/*
* 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 HLN(ap) ((ap)->ar_hln)
#define PLN(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))
/*
* 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 */
#define ARPHRD_ATM2225 19 /* ATM (RFC 2225) */
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 */
#define ATMARPOP_NAK 10 /* NAK */
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 ATMSHLN(ap) ((ap)->aar_shtl & ATMARP_LEN_MASK)
#define ATMSSLN(ap) ((ap)->aar_sstl & ATMARP_LEN_MASK)
#define ATMSPLN(ap) ((ap)->aar_spln)
#define ATMOP(ap) EXTRACT_16BITS(&(ap)->aar_op)
#define ATMPRO(ap) EXTRACT_16BITS(&(ap)->aar_pro)
#define ATMTHLN(ap) ((ap)->aar_thtl & ATMARP_LEN_MASK)
#define ATMTSLN(ap) ((ap)->aar_tstl & ATMARP_LEN_MASK)
#define ATMTPLN(ap) ((ap)->aar_tpln)
#define aar_sha(ap) ((const u_char *)((ap)+1))
#define aar_ssa(ap) (aar_sha(ap) + ATMSHLN(ap))
#define aar_spa(ap) (aar_ssa(ap) + ATMSSLN(ap))
#define aar_tha(ap) (aar_spa(ap) + ATMSPLN(ap))
#define aar_tsa(ap) (aar_tha(ap) + ATMTHLN(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 void
atmarp_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, ha_len)));
if (srca_len != 0)
ND_PRINT((ndo, ",%s",
linkaddr_string(srca, srca_len)));
}
}
static void
atmarp_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), ATMTPLN(ap))) {
ND_PRINT((ndo, "truncated-atmarp"));
ND_DEFAULTPRINT((const u_char *)ap, length);
return;
}
if ((pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL) ||
ATMSPLN(ap) != 4 || ATMTPLN(ap) != 4) {
ND_PRINT((ndo, "atmarp-#%d for proto #%d (%d/%d) hardware #%d",
op, pro, ATMSPLN(ap), ATMTPLN(ap), hrd));
return;
}
if (pro == ETHERTYPE_TRAIL)
ND_PRINT((ndo, "trailer-"));
switch (op) {
case ARPOP_REQUEST:
ND_PRINT((ndo, "arp who-has %s", ipaddr_string(ATMTPA(ap))));
if (ATMTHLN(ap) != 0) {
ND_PRINT((ndo, " ("));
atmarp_addr_print(ndo, ATMTHA(ap), ATMTHLN(ap),
ATMTSA(ap), ATMTSLN(ap));
ND_PRINT((ndo, ")"));
}
ND_PRINT((ndo, " tell %s", ipaddr_string(ATMSPA(ap))));
break;
case ARPOP_REPLY:
ND_PRINT((ndo, "arp reply %s", ipaddr_string(ATMSPA(ap))));
ND_PRINT((ndo, " is-at "));
atmarp_addr_print(ndo, ATMSHA(ap), ATMSHLN(ap), ATMSSA(ap),
ATMSSLN(ap));
break;
case ARPOP_INVREQUEST:
ND_PRINT((ndo, "invarp who-is "));
atmarp_addr_print(ndo, ATMTHA(ap), ATMTHLN(ap), ATMTSA(ap),
ATMTSLN(ap));
ND_PRINT((ndo, " tell "));
atmarp_addr_print(ndo, ATMSHA(ap), ATMSHLN(ap), ATMSSA(ap),
ATMSSLN(ap));
break;
case ARPOP_INVREPLY:
ND_PRINT((ndo, "invarp reply "));
atmarp_addr_print(ndo, ATMSHA(ap), ATMSHLN(ap), ATMSSA(ap),
ATMSSLN(ap));
ND_PRINT((ndo, " at %s", ipaddr_string(ATMSPA(ap))));
break;
case ATMARPOP_NAK:
ND_PRINT((ndo, "nak reply for %s",
ipaddr_string(ATMSPA(ap))));
break;
default:
ND_PRINT((ndo, "atmarp-#%d", op));
ND_DEFAULTPRINT((const u_char *)ap, caplen);
return;
}
return;
trunc:
ND_PRINT((ndo, "[|atmarp]"));
}
void
arp_print(netdissect_options *ndo,
const u_char *bp, u_int length, u_int caplen)
{
const struct arp_pkthdr *ap;
u_short pro, hrd, op;
ap = (const struct arp_pkthdr *)bp;
ND_TCHECK(*ap);
hrd = HRD(ap);
if (hrd == ARPHRD_ATM2225) {
atmarp_print(ndo, bp, length, caplen);
return;
}
pro = PRO(ap);
op = OP(ap);
if (!ND_TTEST2(*ar_tpa(ap), PLN(ap))) {
ND_PRINT((ndo, "truncated-arp"));
ND_DEFAULTPRINT((const u_char *)ap, length);
return;
}
if ((pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL) ||
PLN(ap) != 4 || HLN(ap) == 0) {
ND_PRINT((ndo, "arp-#%d for proto #%d (%d) hardware #%d (%d)",
op, pro, PLN(ap), hrd, HLN(ap)));
return;
}
if (pro == ETHERTYPE_TRAIL)
ND_PRINT((ndo, "trailer-"));
switch (op) {
case ARPOP_REQUEST:
ND_PRINT((ndo, "arp who-has %s", ipaddr_string(TPA(ap))));
if (memcmp((const char *)ezero, (const char *)THA(ap), HLN(ap)) != 0)
ND_PRINT((ndo, " (%s)",
linkaddr_string(THA(ap), HLN(ap))));
ND_PRINT((ndo, " tell %s", ipaddr_string(SPA(ap))));
break;
case ARPOP_REPLY:
ND_PRINT((ndo, "arp reply %s", ipaddr_string(SPA(ap))));
ND_PRINT((ndo, " is-at %s", linkaddr_string(SHA(ap), HLN(ap))));
break;
case ARPOP_REVREQUEST:
ND_PRINT((ndo, "rarp who-is %s tell %s",
linkaddr_string(THA(ap), HLN(ap)),
linkaddr_string(SHA(ap), HLN(ap))));
break;
case ARPOP_REVREPLY:
ND_PRINT((ndo, "rarp reply %s at %s",
linkaddr_string(THA(ap), HLN(ap)),
ipaddr_string(TPA(ap))));
break;
case ARPOP_INVREQUEST:
ND_PRINT((ndo, "invarp who-is %s tell %s",
linkaddr_string(THA(ap), HLN(ap)),
linkaddr_string(SHA(ap), HLN(ap))));
break;
case ARPOP_INVREPLY:
ND_PRINT((ndo,"invarp reply %s at %s",
linkaddr_string(THA(ap), HLN(ap)),
ipaddr_string(TPA(ap))));
break;
default:
ND_PRINT((ndo, "arp-#%d", op));
ND_DEFAULTPRINT((const u_char *)ap, caplen);
return;
}
if (hrd != ARPHRD_ETHER)
ND_PRINT((ndo, " hardware #%d", hrd));
return;
trunc:
ND_PRINT((ndo, "[|arp]"));
}
/*
* Local Variables:
* c-style: bsd
* End:
*/
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