print-eigrp.c

来自「TCPDUMP的C语言源代码,是在数据链路层的应用」· C语言 代码 · 共 481 行 · 第 1/2 页

/*
 * Copyright (c) 1998-2004  Hannes Gredler <[e-mail]>
 *      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 lint
static 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                   7

static 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        0x0303

static 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}
};

void
eigrp_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;