1 /* $OpenBSD: print-vrrp.c,v 1.4 2015/11/16 00:16:39 mmcc 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 #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 void 68 vrrp_print(const u_char *bp, u_int len, int ttl) 69 { 70 int version, type, auth_type; 71 char *type_s; 72 73 TCHECK(bp[0]); 74 version = (bp[0] & 0xf0) >> 4; 75 type = bp[0] & 0x0f; 76 if (type == 1) 77 type_s = "advertise"; 78 else 79 type_s = "unknown"; 80 printf("VRRPv%d-%s %d: ", version, type_s, len); 81 if (ttl != 255) 82 printf("[ttl=%d!] ", ttl); 83 if (version != 2 || type != 1) 84 return; 85 TCHECK(bp[2]); 86 printf("vrid=%d prio=%d", bp[1], bp[2]); 87 TCHECK(bp[5]); 88 auth_type = bp[4]; 89 if (auth_type != 0) 90 printf(" authtype=%d", auth_type); 91 printf(" intvl=%d", bp[5]); 92 if (vflag) { 93 int naddrs = bp[3]; 94 int i; 95 char c; 96 97 if (TTEST2(bp[0], len) && in_cksum((const u_short*)bp, len, 0)) 98 printf(" (bad vrrp cksum %x!)", 99 EXTRACT_16BITS(&bp[6])); 100 printf(" addrs"); 101 if (naddrs > 1) 102 printf("(%d)", naddrs); 103 printf(":"); 104 c = ' '; 105 bp += 8; 106 for (i = 0; i < naddrs; i++) { 107 TCHECK(bp[3]); 108 printf("%c%s", c, ipaddr_string(bp)); 109 c = ','; 110 bp += 4; 111 } 112 if (auth_type == 1) { /* simple text password */ 113 TCHECK(bp[7]); 114 printf(" auth %.8s", bp); 115 } 116 } 117 return; 118 trunc: 119 printf("[|vrrp]"); 120 } 121