/* * Copyright (c) 1998-2004  Hannes Gredler <hannes@tcpdump.org> *      The TCPDUMP project * * 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, and (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. * 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-eigrp.c,v 1.7 2005-05-06 02:53:26 guy Exp $";#endif#ifdef HAVE_CONFIG_H#include "config.h"#endif#include <tcpdump-stdinc.h>#include <stdio.h>#include <stdlib.h>#include <string.h>#include "interface.h"#include "extract.h"#include "addrtoname.h"/* * packet format documented at * http://www.rhyshaden.com/eigrp.htm */struct eigrp_common_header {    u_int8_t version;    u_int8_t opcode;    u_int8_t checksum[2];    u_int8_t flags[4];    u_int8_t seq[4];    u_int8_t ack[4];    u_int8_t asn[4];};#define	EIGRP_VERSION                        2#define	EIGRP_OPCODE_UPDATE                  1#define	EIGRP_OPCODE_QUERY                   3#define	EIGRP_OPCODE_REPLY                   4#define	EIGRP_OPCODE_HELLO                   5#define	EIGRP_OPCODE_IPXSAP                  6#define	EIGRP_OPCODE_PROBE                   7static const struct tok eigrp_opcode_values[] = {    { EIGRP_OPCODE_UPDATE, "Update" },    { EIGRP_OPCODE_QUERY, "Query" },    { EIGRP_OPCODE_REPLY, "Reply" },    { EIGRP_OPCODE_HELLO, "Hello" },    { EIGRP_OPCODE_IPXSAP, "IPX SAP" },    { EIGRP_OPCODE_PROBE, "Probe" },    { 0, NULL}};static const struct tok eigrp_common_header_flag_values[] = {    { 0x01, "Init" },    { 0x02, "Conditionally Received" },    { 0, NULL}};struct eigrp_tlv_header {    u_int8_t type[2];    u_int8_t length[2];};#define EIGRP_TLV_GENERAL_PARM   0x0001#define EIGRP_TLV_AUTH           0x0002#define EIGRP_TLV_SEQ            0x0003#define EIGRP_TLV_SW_VERSION     0x0004#define EIGRP_TLV_MCAST_SEQ      0x0005#define EIGRP_TLV_IP_INT         0x0102#define EIGRP_TLV_IP_EXT         0x0103#define EIGRP_TLV_AT_INT         0x0202#define EIGRP_TLV_AT_EXT         0x0203#define EIGRP_TLV_AT_CABLE_SETUP 0x0204#define EIGRP_TLV_IPX_INT        0x0302#define EIGRP_TLV_IPX_EXT        0x0303static const struct tok eigrp_tlv_values[] = {    { EIGRP_TLV_GENERAL_PARM, "General Parameters"},    { EIGRP_TLV_AUTH, "Authentication"},    { EIGRP_TLV_SEQ, "Sequence"},    { EIGRP_TLV_SW_VERSION, "Software Version"},    { EIGRP_TLV_MCAST_SEQ, "Next Multicast Sequence"},    { EIGRP_TLV_IP_INT, "IP Internal routes"},    { EIGRP_TLV_IP_EXT, "IP External routes"},    { EIGRP_TLV_AT_INT, "AppleTalk Internal routes"},    { EIGRP_TLV_AT_EXT, "AppleTalk External routes"},    { EIGRP_TLV_AT_CABLE_SETUP, "AppleTalk Cable setup"},    { EIGRP_TLV_IPX_INT, "IPX Internal routes"},    { EIGRP_TLV_IPX_EXT, "IPX External routes"},    { 0, NULL}};struct eigrp_tlv_general_parm_t {    u_int8_t k1;    u_int8_t k2;    u_int8_t k3;    u_int8_t k4;    u_int8_t k5;    u_int8_t res;    u_int8_t holdtime[2];};          struct eigrp_tlv_sw_version_t {    u_int8_t ios_major;    u_int8_t ios_minor;    u_int8_t eigrp_major;    u_int8_t eigrp_minor;}; struct eigrp_tlv_ip_int_t {    u_int8_t nexthop[4];    u_int8_t delay[4];    u_int8_t bandwidth[4];    u_int8_t mtu[3];    u_int8_t hopcount;    u_int8_t reliability;    u_int8_t load;    u_int8_t reserved[2];    u_int8_t plen;    u_int8_t destination; /* variable length [1-4] bytes encoding */}; struct eigrp_tlv_ip_ext_t {    u_int8_t nexthop[4];    u_int8_t origin_router[4];    u_int8_t origin_as[4];    u_int8_t tag[4];    u_int8_t metric[4];    u_int8_t reserved[2];    u_int8_t proto_id;    u_int8_t flags;    u_int8_t delay[4];    u_int8_t bandwidth[4];    u_int8_t mtu[3];    u_int8_t hopcount;    u_int8_t reliability;    u_int8_t load;    u_int8_t reserved2[2];    u_int8_t plen;    u_int8_t destination; /* variable length [1-4] bytes encoding */}; struct eigrp_tlv_at_cable_setup_t {    u_int8_t cable_start[2];    u_int8_t cable_end[2];    u_int8_t router_id[4];};struct eigrp_tlv_at_int_t {    u_int8_t nexthop[4];    u_int8_t delay[4];    u_int8_t bandwidth[4];    u_int8_t mtu[3];    u_int8_t hopcount;    u_int8_t reliability;    u_int8_t load;    u_int8_t reserved[2];    u_int8_t cable_start[2];    u_int8_t cable_end[2];}; struct eigrp_tlv_at_ext_t {    u_int8_t nexthop[4];    u_int8_t origin_router[4];    u_int8_t origin_as[4];    u_int8_t tag[4];    u_int8_t proto_id;    u_int8_t flags;    u_int8_t metric[2];    u_int8_t delay[4];    u_int8_t bandwidth[4];    u_int8_t mtu[3];    u_int8_t hopcount;    u_int8_t reliability;    u_int8_t load;    u_int8_t reserved2[2];    u_int8_t cable_start[2];    u_int8_t cable_end[2];};static const struct tok eigrp_ext_proto_id_values[] = {    { 0x01, "IGRP" },    { 0x02, "EIGRP" },    { 0x03, "Static" },    { 0x04, "RIP" },    { 0x05, "Hello" },    { 0x06, "OSPF" },    { 0x07, "IS-IS" },    { 0x08, "EGP" },    { 0x09, "BGP" },    { 0x0a, "IDRP" },    { 0x0b, "Connected" },    { 0, NULL}};voideigrp_print(register const u_char *pptr, register u_int len) {    const struct eigrp_common_header *eigrp_com_header;    const struct eigrp_tlv_header *eigrp_tlv_header;    const u_char *tptr,*tlv_tptr;    u_int tlen,eigrp_tlv_len,eigrp_tlv_type,tlv_tlen, byte_length, bit_length;    u_int8_t prefix[4];    union {        const struct eigrp_tlv_general_parm_t *eigrp_tlv_general_parm;        const struct eigrp_tlv_sw_version_t *eigrp_tlv_sw_version;        const struct eigrp_tlv_ip_int_t *eigrp_tlv_ip_int;        const struct eigrp_tlv_ip_ext_t *eigrp_tlv_ip_ext;        const struct eigrp_tlv_at_cable_setup_t *eigrp_tlv_at_cable_setup;        const struct eigrp_tlv_at_int_t *eigrp_tlv_at_int;        const struct eigrp_tlv_at_ext_t *eigrp_tlv_at_ext;    } tlv_ptr;    tptr=pptr;    eigrp_com_header = (const struct eigrp_common_header *)pptr;    TCHECK(*eigrp_com_header);    /*     * Sanity checking of the header.     */    if (eigrp_com_header->version != EIGRP_VERSION) {	printf("EIGRP version %u packet not supported",eigrp_com_header->version);	return;