1 /* 2 * Copyright (c) 2000 William C. Fenner. 3 * All rights reserved. 4 * 5 * Kevin Steves <ks@hp.se> July 2000 6 * Modified to: 7 * - print version, type string and packet length 8 * - print IP address count if > 1 (-v) 9 * - verify checksum (-v) 10 * - print authentication string (-v) 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that: (1) source code 14 * distributions retain the above copyright notice and this paragraph 15 * in its entirety, and (2) distributions including binary code include 16 * the above copyright notice and this paragraph in its entirety in 17 * the documentation or other materials provided with the distribution. 18 * The name of William C. Fenner may not be used to endorse or 19 * promote products derived from this software without specific prior 20 * written permission. THIS SOFTWARE IS PROVIDED ``AS IS'' AND 21 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT 22 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE. 24 */ 25 26 #ifndef lint 27 static const char rcsid[] = 28 "@(#) $Header: /tcpdump/master/tcpdump/print-vrrp.c,v 1.5 2001/07/23 22:27:30 fenner Exp $"; 29 #endif 30 31 #ifdef HAVE_CONFIG_H 32 #include "config.h" 33 #endif 34 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <unistd.h> 38 39 #include <netinet/in.h> 40 41 #include "interface.h" 42 #include "extract.h" 43 #include "addrtoname.h" 44 45 /* 46 * RFC 2338: 47 * 0 1 2 3 48 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 49 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 50 * |Version| Type | Virtual Rtr ID| Priority | Count IP Addrs| 51 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 52 * | Auth Type | Adver Int | Checksum | 53 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 54 * | IP Address (1) | 55 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 56 * | . | 57 * | . | 58 * | . | 59 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 60 * | IP Address (n) | 61 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 62 * | Authentication Data (1) | 63 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 64 * | Authentication Data (2) | 65 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 66 */ 67 68 /* Type */ 69 #define VRRP_TYPE_ADVERTISEMENT 1 70 71 static const struct tok type2str[] = { 72 { VRRP_TYPE_ADVERTISEMENT, "advertisement" }, 73 { 0, NULL } 74 }; 75 76 /* Auth Type */ 77 #define VRRP_AUTH_NONE 0 78 #define VRRP_AUTH_SIMPLE 1 79 #define VRRP_AUTH_AH 2 80 81 static const struct tok auth2str[] = { 82 { VRRP_AUTH_NONE, "none" }, 83 { VRRP_AUTH_SIMPLE, "simple" }, 84 { VRRP_AUTH_AH, "ah" }, 85 { 0, NULL } 86 }; 87 88 void 89 vrrp_print(register const u_char *bp, register u_int len, int ttl) 90 { 91 int version, type, auth_type; 92 const char *type_s; 93 94 TCHECK(bp[0]); 95 version = (bp[0] & 0xf0) >> 4; 96 type = bp[0] & 0x0f; 97 type_s = tok2str(type2str, "type#%d", type); 98 printf("VRRPv%d-%s %d: ", version, type_s, len); 99 if (ttl != 255) 100 printf("[ttl=%d!] ", ttl); 101 if (version != 2 || type != VRRP_TYPE_ADVERTISEMENT) 102 return; 103 TCHECK(bp[2]); 104 printf("vrid=%d prio=%d", bp[1], bp[2]); 105 TCHECK(bp[5]); 106 auth_type = bp[4]; 107 printf(" authtype=%s", tok2str(auth2str, NULL, auth_type)); 108 printf(" intvl=%d", bp[5]); 109 if (vflag) { 110 int naddrs = bp[3]; 111 int i; 112 char c; 113 114 if (TTEST2(bp[0], len) && in_cksum((const u_short*)bp, len, 0)) 115 printf(" (bad vrrp cksum %x!)", 116 EXTRACT_16BITS(&bp[6])); 117 printf(" addrs"); 118 if (naddrs > 1) 119 printf("(%d)", naddrs); 120 printf(":"); 121 c = ' '; 122 bp += 8; 123 for (i = 0; i < naddrs; i++) { 124 TCHECK(bp[3]); 125 printf("%c%s", c, ipaddr_string(bp)); 126 c = ','; 127 bp += 4; 128 } 129 if (auth_type == VRRP_AUTH_SIMPLE) { /* simple text password */ 130 TCHECK(bp[7]); 131 printf(" auth \""); 132 fn_printn(bp, 8, NULL); 133 printf("\""); 134 } 135 } 136 return; 137 trunc: 138 printf("[|vrrp]"); 139 } 140