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