1 /* 2 * Copyright (C) 2001 Julian Cowley 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 /* Cisco Hot Standby Router Protocol (HSRP). */ 31 32 #ifndef lint 33 static const char rcsid[] _U_ = 34 "@(#) $Header: /tcpdump/master/tcpdump/print-hsrp.c,v 1.9.2.1 2005/05/06 07:57:17 guy Exp $"; 35 #endif 36 37 #ifdef HAVE_CONFIG_H 38 #include "config.h" 39 #endif 40 41 #include <tcpdump-stdinc.h> 42 43 #include <stdio.h> 44 45 #include "interface.h" 46 #include "addrtoname.h" 47 48 /* HSRP op code types. */ 49 static const char *op_code_str[] = { 50 "hello", 51 "coup", 52 "resign" 53 }; 54 55 /* HSRP states and associated names. */ 56 static struct tok states[] = { 57 { 0, "initial" }, 58 { 1, "learn" }, 59 { 2, "listen" }, 60 { 4, "speak" }, 61 { 8, "standby" }, 62 { 16, "active" }, 63 { 0, NULL } 64 }; 65 66 /* 67 * RFC 2281: 68 * 69 * 0 1 2 3 70 * 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 71 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 72 * | Version | Op Code | State | Hellotime | 73 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 74 * | Holdtime | Priority | Group | Reserved | 75 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 76 * | Authentication Data | 77 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 78 * | Authentication Data | 79 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 80 * | Virtual IP Address | 81 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 82 */ 83 84 #define HSRP_AUTH_SIZE 8 85 86 /* HSRP protocol header. */ 87 struct hsrp { 88 u_int8_t hsrp_version; 89 u_int8_t hsrp_op_code; 90 u_int8_t hsrp_state; 91 u_int8_t hsrp_hellotime; 92 u_int8_t hsrp_holdtime; 93 u_int8_t hsrp_priority; 94 u_int8_t hsrp_group; 95 u_int8_t hsrp_reserved; 96 u_int8_t hsrp_authdata[HSRP_AUTH_SIZE]; 97 struct in_addr hsrp_virtaddr; 98 }; 99 100 void 101 hsrp_print(register const u_int8_t *bp, register u_int len) 102 { 103 struct hsrp *hp = (struct hsrp *) bp; 104 105 TCHECK(hp->hsrp_version); 106 printf("HSRPv%d", hp->hsrp_version); 107 if (hp->hsrp_version != 0) 108 return; 109 TCHECK(hp->hsrp_op_code); 110 printf("-"); 111 printf("%s ", tok2strary(op_code_str, "unknown (%d)", hp->hsrp_op_code)); 112 printf("%d: ", len); 113 TCHECK(hp->hsrp_state); 114 printf("state=%s ", tok2str(states, "Unknown (%d)", hp->hsrp_state)); 115 TCHECK(hp->hsrp_group); 116 printf("group=%d ", hp->hsrp_group); 117 TCHECK(hp->hsrp_reserved); 118 if (hp->hsrp_reserved != 0) { 119 printf("[reserved=%d!] ", hp->hsrp_reserved); 120 } 121 TCHECK(hp->hsrp_virtaddr); 122 printf("addr=%s", ipaddr_string(&hp->hsrp_virtaddr)); 123 if (vflag) { 124 printf(" hellotime="); 125 relts_print(hp->hsrp_hellotime); 126 printf(" holdtime="); 127 relts_print(hp->hsrp_holdtime); 128 printf(" priority=%d", hp->hsrp_priority); 129 printf(" auth=\""); 130 if (fn_printn(hp->hsrp_authdata, sizeof(hp->hsrp_authdata), 131 snapend)) { 132 printf("\""); 133 goto trunc; 134 } 135 printf("\""); 136 } 137 return; 138 trunc: 139 printf("[|hsrp]"); 140 } 141