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 /* \summary: Cisco Hot Standby Router Protocol (HSRP) printer */ 31 32 /* Cisco Hot Standby Router Protocol (HSRP). */ 33 34 #include <sys/cdefs.h> 35 #ifndef lint 36 __RCSID("$NetBSD: print-hsrp.c,v 1.7 2017/02/05 04:05:05 spz Exp $"); 37 #endif 38 39 #ifdef HAVE_CONFIG_H 40 #include "config.h" 41 #endif 42 43 #include <netdissect-stdinc.h> 44 45 #include "netdissect.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 const 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 uint8_t hsrp_version; 89 uint8_t hsrp_op_code; 90 uint8_t hsrp_state; 91 uint8_t hsrp_hellotime; 92 uint8_t hsrp_holdtime; 93 uint8_t hsrp_priority; 94 uint8_t hsrp_group; 95 uint8_t hsrp_reserved; 96 uint8_t hsrp_authdata[HSRP_AUTH_SIZE]; 97 struct in_addr hsrp_virtaddr; 98 }; 99 100 void 101 hsrp_print(netdissect_options *ndo, register const uint8_t *bp, register u_int len) 102 { 103 const struct hsrp *hp = (const struct hsrp *) bp; 104 105 ND_TCHECK(hp->hsrp_version); 106 ND_PRINT((ndo, "HSRPv%d", hp->hsrp_version)); 107 if (hp->hsrp_version != 0) 108 return; 109 ND_TCHECK(hp->hsrp_op_code); 110 ND_PRINT((ndo, "-")); 111 ND_PRINT((ndo, "%s ", tok2strary(op_code_str, "unknown (%d)", hp->hsrp_op_code))); 112 ND_PRINT((ndo, "%d: ", len)); 113 ND_TCHECK(hp->hsrp_state); 114 ND_PRINT((ndo, "state=%s ", tok2str(states, "Unknown (%d)", hp->hsrp_state))); 115 ND_TCHECK(hp->hsrp_group); 116 ND_PRINT((ndo, "group=%d ", hp->hsrp_group)); 117 ND_TCHECK(hp->hsrp_reserved); 118 if (hp->hsrp_reserved != 0) { 119 ND_PRINT((ndo, "[reserved=%d!] ", hp->hsrp_reserved)); 120 } 121 ND_TCHECK(hp->hsrp_virtaddr); 122 ND_PRINT((ndo, "addr=%s", ipaddr_string(ndo, &hp->hsrp_virtaddr))); 123 if (ndo->ndo_vflag) { 124 ND_PRINT((ndo, " hellotime=")); 125 unsigned_relts_print(ndo, hp->hsrp_hellotime); 126 ND_PRINT((ndo, " holdtime=")); 127 unsigned_relts_print(ndo, hp->hsrp_holdtime); 128 ND_PRINT((ndo, " priority=%d", hp->hsrp_priority)); 129 ND_PRINT((ndo, " auth=\"")); 130 if (fn_printn(ndo, hp->hsrp_authdata, sizeof(hp->hsrp_authdata), 131 ndo->ndo_snapend)) { 132 ND_PRINT((ndo, "\"")); 133 goto trunc; 134 } 135 ND_PRINT((ndo, "\"")); 136 } 137 return; 138 trunc: 139 ND_PRINT((ndo, "[|hsrp]")); 140 } 141