1 /* $OpenBSD: print-hsrp.c,v 1.5 2015/11/16 00:16:39 mmcc Exp $ */ 2 3 /* 4 * Copyright (C) 2001 Julian Cowley 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* Cisco Hot Standby Router Protocol (HSRP). */ 33 34 #ifdef HAVE_CONFIG_H 35 #include "config.h" 36 #endif 37 38 #include <sys/types.h> 39 40 #include <stdio.h> 41 #include <netinet/in.h> 42 43 #include "interface.h" 44 #include "addrtoname.h" 45 46 /* HSRP op code types. */ 47 static const char *op_code_str[] = { 48 "hello", 49 "coup", 50 "resign" 51 }; 52 53 /* HSRP states and associated names. */ 54 static struct tok states[] = { 55 { 0, "initial" }, 56 { 1, "learn" }, 57 { 2, "listen" }, 58 { 4, "speak" }, 59 { 8, "standby" }, 60 { 16, "active" }, 61 { 0, NULL } 62 }; 63 64 /* 65 * RFC 2281: 66 * 67 * 0 1 2 3 68 * 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 69 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 70 * | Version | Op Code | State | Hellotime | 71 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 72 * | Holdtime | Priority | Group | Reserved | 73 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 74 * | Authentication Data | 75 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 76 * | Authentication Data | 77 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 78 * | Virtual IP Address | 79 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 80 */ 81 82 #define HSRP_AUTH_SIZE 8 83 84 /* HSRP protocol header. */ 85 struct hsrp { 86 u_char hsrp_version; 87 u_char hsrp_op_code; 88 u_char hsrp_state; 89 u_char hsrp_hellotime; 90 u_char hsrp_holdtime; 91 u_char hsrp_priority; 92 u_char hsrp_group; 93 u_char hsrp_reserved; 94 u_char hsrp_authdata[HSRP_AUTH_SIZE]; 95 struct in_addr hsrp_virtaddr; 96 }; 97 98 void 99 hsrp_print(const u_char *bp, u_int len) 100 { 101 struct hsrp *hp = (struct hsrp *) bp; 102 103 TCHECK(hp->hsrp_version); 104 printf("HSRPv%d", hp->hsrp_version); 105 if (hp->hsrp_version != 0) 106 return; 107 TCHECK(hp->hsrp_op_code); 108 printf("-"); 109 if (hp->hsrp_op_code >= sizeof(op_code_str)/sizeof(*op_code_str)) 110 printf("unknown (%d) ", hp->hsrp_op_code); 111 else 112 printf("%s ", op_code_str[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