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[] = 34 "@(#) $Header: /tcpdump/master/tcpdump/print-hsrp.c,v 1.2 2001/10/08 16:12:37 fenner Exp $"; 35 #endif 36 37 #ifdef HAVE_CONFIG_H 38 #include "config.h" 39 #endif 40 41 #include <sys/types.h> 42 43 #include <stdio.h> 44 #include <netinet/in.h> 45 46 #include "interface.h" 47 #include "addrtoname.h" 48 49 /* HSRP op code types. */ 50 static const char *op_code_str[] = { 51 "hello", 52 "coup", 53 "resign" 54 }; 55 56 /* HSRP states and associated names. */ 57 static struct tok states[] = { 58 { 0, "initial" }, 59 { 1, "learn" }, 60 { 2, "listen" }, 61 { 4, "speak" }, 62 { 8, "standby" }, 63 { 16, "active" }, 64 { 0, NULL } 65 }; 66 67 /* 68 * RFC 2281: 69 * 70 * 0 1 2 3 71 * 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 72 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 73 * | Version | Op Code | State | Hellotime | 74 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 75 * | Holdtime | Priority | Group | Reserved | 76 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 77 * | Authentication Data | 78 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 79 * | Authentication Data | 80 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 81 * | Virtual IP Address | 82 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 83 */ 84 85 #define HSRP_AUTH_SIZE 8 86 87 /* HSRP protocol header. */ 88 struct hsrp { 89 u_char hsrp_version; 90 u_char hsrp_op_code; 91 u_char hsrp_state; 92 u_char hsrp_hellotime; 93 u_char hsrp_holdtime; 94 u_char hsrp_priority; 95 u_char hsrp_group; 96 u_char hsrp_reserved; 97 u_char hsrp_authdata[HSRP_AUTH_SIZE]; 98 struct in_addr hsrp_virtaddr; 99 }; 100 101 void 102 hsrp_print(register const u_char *bp, register u_int len) 103 { 104 struct hsrp *hp = (struct hsrp *) bp; 105 106 TCHECK(hp->hsrp_version); 107 printf("HSRPv%d", hp->hsrp_version); 108 if (hp->hsrp_version != 0) 109 return; 110 TCHECK(hp->hsrp_op_code); 111 printf("-"); 112 printf("%s ", tok2strary(op_code_str, "unknown (%d)", hp->hsrp_op_code)); 113 printf("%d: ", len); 114 TCHECK(hp->hsrp_state); 115 printf("state=%s ", tok2str(states, "Unknown (%d)", hp->hsrp_state)); 116 TCHECK(hp->hsrp_group); 117 printf("group=%d ", hp->hsrp_group); 118 TCHECK(hp->hsrp_reserved); 119 if (hp->hsrp_reserved != 0) { 120 printf("[reserved=%d!] ", hp->hsrp_reserved); 121 } 122 TCHECK2(hp->hsrp_virtaddr, sizeof(hp->hsrp_virtaddr)); 123 printf("addr=%s", ipaddr_string(&hp->hsrp_virtaddr)); 124 if (vflag) { 125 printf(" hellotime="); 126 relts_print(hp->hsrp_hellotime); 127 printf(" holdtime="); 128 relts_print(hp->hsrp_holdtime); 129 printf(" priority=%d", hp->hsrp_priority); 130 printf(" auth=\""); 131 fn_printn(hp->hsrp_authdata, sizeof(hp->hsrp_authdata), NULL); 132 printf("\""); 133 } 134 return; 135 trunc: 136 printf("[|hsrp]"); 137 } 138