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Diffstat (limited to 'contrib/tcpdump/print-arp.c')
| -rw-r--r-- | contrib/tcpdump/print-arp.c | 343 |
1 files changed, 343 insertions, 0 deletions
diff --git a/contrib/tcpdump/print-arp.c b/contrib/tcpdump/print-arp.c new file mode 100644 index 0000000..3dc2894 --- /dev/null +++ b/contrib/tcpdump/print-arp.c @@ -0,0 +1,343 @@ +/* + * 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. + * + * $FreeBSD$ + */ + +#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: + */ + |
