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 /* specification: RFC 2281 for version 1 */ 33 34 #include <sys/cdefs.h> 35 #ifndef lint 36 __RCSID("$NetBSD: print-hsrp.c,v 1.8 2023/08/17 20:19:40 christos 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 #include "extract.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 const 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 nd_uint8_t hsrp_version; 90 nd_uint8_t hsrp_op_code; 91 nd_uint8_t hsrp_state; 92 nd_uint8_t hsrp_hellotime; 93 nd_uint8_t hsrp_holdtime; 94 nd_uint8_t hsrp_priority; 95 nd_uint8_t hsrp_group; 96 nd_uint8_t hsrp_reserved; 97 nd_byte hsrp_authdata[HSRP_AUTH_SIZE]; 98 nd_ipv4 hsrp_virtaddr; 99 }; 100 101 void 102 hsrp_print(netdissect_options *ndo, const u_char *bp, u_int len) 103 { 104 const struct hsrp *hp = (const struct hsrp *) bp; 105 uint8_t version; 106 107 ndo->ndo_protocol = "hsrp"; 108 version = GET_U_1(hp->hsrp_version); 109 ND_PRINT("HSRPv%u", version); 110 if (version != 0) 111 return; 112 ND_PRINT("-"); 113 ND_PRINT("%s ", 114 tok2strary(op_code_str, "unknown (%u)", GET_U_1(hp->hsrp_op_code))); 115 ND_PRINT("%u: ", len); 116 ND_PRINT("state=%s ", 117 tok2str(states, "Unknown (%u)", GET_U_1(hp->hsrp_state))); 118 ND_PRINT("group=%u ", GET_U_1(hp->hsrp_group)); 119 if (GET_U_1(hp->hsrp_reserved) != 0) { 120 ND_PRINT("[reserved=%u!] ", GET_U_1(hp->hsrp_reserved)); 121 } 122 ND_PRINT("addr=%s", GET_IPADDR_STRING(hp->hsrp_virtaddr)); 123 if (ndo->ndo_vflag) { 124 ND_PRINT(" hellotime="); 125 unsigned_relts_print(ndo, GET_U_1(hp->hsrp_hellotime)); 126 ND_PRINT(" holdtime="); 127 unsigned_relts_print(ndo, GET_U_1(hp->hsrp_holdtime)); 128 ND_PRINT(" priority=%u", GET_U_1(hp->hsrp_priority)); 129 ND_PRINT(" auth=\""); 130 /* 131 * RFC 2281 Section 5.1 does not specify the encoding of 132 * Authentication Data explicitly, but zero padding can be 133 * inferred from the "recommended default value". 134 */ 135 nd_printjnp(ndo, hp->hsrp_authdata, HSRP_AUTH_SIZE); 136 ND_PRINT("\""); 137 } 138 } 139