1 /* $OpenBSD: print-vrrp.c,v 1.2 2007/10/07 16:41:05 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 2000 William C. Fenner. 5 * All rights reserved. 6 * 7 * Kevin Steves <ks@hp.se> July 2000 8 * Modified to: 9 * - print version, type string and packet length 10 * - print IP address count if > 1 (-v) 11 * - verify checksum (-v) 12 * - print authentication string (-v) 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that: (1) source code 16 * distributions retain the above copyright notice and this paragraph 17 * in its entirety, and (2) distributions including binary code include 18 * the above copyright notice and this paragraph in its entirety in 19 * the documentation or other materials provided with the distribution. 20 * The name of William C. Fenner may not be used to endorse or 21 * promote products derived from this software without specific prior 22 * written permission. THIS SOFTWARE IS PROVIDED ``AS IS'' AND 23 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT 24 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 25 * FOR A PARTICULAR PURPOSE. 26 * 27 * from tcpdump.org: 28 * Header: /tcpdump/master/tcpdump/print-vrrp.c,v 1.3 2000/10/10 05:05:08 guy Exp 29 */ 30 31 #ifndef lint 32 static const char rcsid[] = 33 "@(#) $Id: print-vrrp.c,v 1.2 2007/10/07 16:41:05 deraadt Exp $"; 34 #endif 35 36 #ifdef HAVE_CONFIG_H 37 #include "config.h" 38 #endif 39 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <unistd.h> 43 44 #include <netinet/in.h> 45 46 #include "interface.h" 47 #include "extract.h" 48 #include "addrtoname.h" 49 50 /* 51 * RFC 2338: 52 * 0 1 2 3 53 * 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 54 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 55 * |Version| Type | Virtual Rtr ID| Priority | Count IP Addrs| 56 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 57 * | Auth Type | Adver Int | Checksum | 58 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 59 * | IP Address (1) | 60 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 61 * | . | 62 * | . | 63 * | . | 64 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 65 * | IP Address (n) | 66 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 67 * | Authentication Data (1) | 68 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 69 * | Authentication Data (2) | 70 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 71 */ 72 void 73 vrrp_print(register const u_char *bp, register u_int len, int ttl) 74 { 75 int version, type, auth_type; 76 char *type_s; 77 78 TCHECK(bp[0]); 79 version = (bp[0] & 0xf0) >> 4; 80 type = bp[0] & 0x0f; 81 if (type == 1) 82 type_s = "advertise"; 83 else 84 type_s = "unknown"; 85 printf("VRRPv%d-%s %d: ", version, type_s, len); 86 if (ttl != 255) 87 printf("[ttl=%d!] ", ttl); 88 if (version != 2 || type != 1) 89 return; 90 TCHECK(bp[2]); 91 printf("vrid=%d prio=%d", bp[1], bp[2]); 92 TCHECK(bp[5]); 93 auth_type = bp[4]; 94 if (auth_type != 0) 95 printf(" authtype=%d", auth_type); 96 printf(" intvl=%d", bp[5]); 97 if (vflag) { 98 int naddrs = bp[3]; 99 int i; 100 char c; 101 102 if (TTEST2(bp[0], len) && in_cksum((const u_short*)bp, len, 0)) 103 printf(" (bad vrrp cksum %x!)", 104 EXTRACT_16BITS(&bp[6])); 105 printf(" addrs"); 106 if (naddrs > 1) 107 printf("(%d)", naddrs); 108 printf(":"); 109 c = ' '; 110 bp += 8; 111 for (i = 0; i < naddrs; i++) { 112 TCHECK(bp[3]); 113 printf("%c%s", c, ipaddr_string(bp)); 114 c = ','; 115 bp += 4; 116 } 117 if (auth_type == 1) { /* simple text password */ 118 TCHECK(bp[7]); 119 printf(" auth %.8s", bp); 120 } 121 } 122 return; 123 trunc: 124 printf("[|vrrp]"); 125 } 126