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 #include <sys/cdefs.h> 33 #ifndef lint 34 __RCSID("$NetBSD: print-hsrp.c,v 1.5 2014/11/20 03:05:03 christos Exp $"); 35 #endif 36 37 #define NETDISSECT_REWORKED 38 #ifdef HAVE_CONFIG_H 39 #include "config.h" 40 #endif 41 42 #include <tcpdump-stdinc.h> 43 44 #include "interface.h" 45 #include "addrtoname.h" 46 47 /* HSRP op code types. */ 48 static const char *op_code_str[] = { 49 "hello", 50 "coup", 51 "resign" 52 }; 53 54 /* HSRP states and associated names. */ 55 static const struct tok states[] = { 56 { 0, "initial" }, 57 { 1, "learn" }, 58 { 2, "listen" }, 59 { 4, "speak" }, 60 { 8, "standby" }, 61 { 16, "active" }, 62 { 0, NULL } 63 }; 64 65 /* 66 * RFC 2281: 67 * 68 * 0 1 2 3 69 * 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 70 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 71 * | Version | Op Code | State | Hellotime | 72 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 73 * | Holdtime | Priority | Group | Reserved | 74 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 75 * | Authentication Data | 76 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 77 * | Authentication Data | 78 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 79 * | Virtual IP Address | 80 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 81 */ 82 83 #define HSRP_AUTH_SIZE 8 84 85 /* HSRP protocol header. */ 86 struct hsrp { 87 uint8_t hsrp_version; 88 uint8_t hsrp_op_code; 89 uint8_t hsrp_state; 90 uint8_t hsrp_hellotime; 91 uint8_t hsrp_holdtime; 92 uint8_t hsrp_priority; 93 uint8_t hsrp_group; 94 uint8_t hsrp_reserved; 95 uint8_t hsrp_authdata[HSRP_AUTH_SIZE]; 96 struct in_addr hsrp_virtaddr; 97 }; 98 99 void 100 hsrp_print(netdissect_options *ndo, register const uint8_t *bp, register u_int len) 101 { 102 struct hsrp *hp = (struct hsrp *) bp; 103 104 ND_TCHECK(hp->hsrp_version); 105 ND_PRINT((ndo, "HSRPv%d", hp->hsrp_version)); 106 if (hp->hsrp_version != 0) 107 return; 108 ND_TCHECK(hp->hsrp_op_code); 109 ND_PRINT((ndo, "-")); 110 ND_PRINT((ndo, "%s ", tok2strary(op_code_str, "unknown (%d)", hp->hsrp_op_code))); 111 ND_PRINT((ndo, "%d: ", len)); 112 ND_TCHECK(hp->hsrp_state); 113 ND_PRINT((ndo, "state=%s ", tok2str(states, "Unknown (%d)", hp->hsrp_state))); 114 ND_TCHECK(hp->hsrp_group); 115 ND_PRINT((ndo, "group=%d ", hp->hsrp_group)); 116 ND_TCHECK(hp->hsrp_reserved); 117 if (hp->hsrp_reserved != 0) { 118 ND_PRINT((ndo, "[reserved=%d!] ", hp->hsrp_reserved)); 119 } 120 ND_TCHECK(hp->hsrp_virtaddr); 121 ND_PRINT((ndo, "addr=%s", ipaddr_string(ndo, &hp->hsrp_virtaddr))); 122 if (ndo->ndo_vflag) { 123 ND_PRINT((ndo, " hellotime=")); 124 relts_print(ndo, hp->hsrp_hellotime); 125 ND_PRINT((ndo, " holdtime=")); 126 relts_print(ndo, hp->hsrp_holdtime); 127 ND_PRINT((ndo, " priority=%d", hp->hsrp_priority)); 128 ND_PRINT((ndo, " auth=\"")); 129 if (fn_printn(ndo, hp->hsrp_authdata, sizeof(hp->hsrp_authdata), 130 ndo->ndo_snapend)) { 131 ND_PRINT((ndo, "\"")); 132 goto trunc; 133 } 134 ND_PRINT((ndo, "\"")); 135 } 136 return; 137 trunc: 138 ND_PRINT((ndo, "[|hsrp]")); 139 } 140