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