135 lines
4.5 KiB
C
135 lines
4.5 KiB
C
/*
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* Copyright (C) 2001 Julian Cowley
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* Cisco Hot Standby Router Protocol (HSRP). */
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#define NETDISSECT_REWORKED
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#include "interface.h"
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#include "addrtoname.h"
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/* HSRP op code types. */
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static const char *op_code_str[] = {
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"hello",
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"coup",
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"resign"
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};
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/* HSRP states and associated names. */
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static const struct tok states[] = {
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{ 0, "initial" },
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{ 1, "learn" },
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{ 2, "listen" },
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{ 4, "speak" },
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{ 8, "standby" },
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{ 16, "active" },
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{ 0, NULL }
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};
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/*
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* RFC 2281:
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*
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Version | Op Code | State | Hellotime |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Holdtime | Priority | Group | Reserved |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Authentication Data |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Authentication Data |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Virtual IP Address |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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#define HSRP_AUTH_SIZE 8
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/* HSRP protocol header. */
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struct hsrp {
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uint8_t hsrp_version;
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uint8_t hsrp_op_code;
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uint8_t hsrp_state;
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uint8_t hsrp_hellotime;
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uint8_t hsrp_holdtime;
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uint8_t hsrp_priority;
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uint8_t hsrp_group;
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uint8_t hsrp_reserved;
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uint8_t hsrp_authdata[HSRP_AUTH_SIZE];
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struct in_addr hsrp_virtaddr;
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};
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void
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hsrp_print(netdissect_options *ndo, register const uint8_t *bp, register u_int len)
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{
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struct hsrp *hp = (struct hsrp *) bp;
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ND_TCHECK(hp->hsrp_version);
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ND_PRINT((ndo, "HSRPv%d", hp->hsrp_version));
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if (hp->hsrp_version != 0)
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return;
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ND_TCHECK(hp->hsrp_op_code);
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ND_PRINT((ndo, "-"));
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ND_PRINT((ndo, "%s ", tok2strary(op_code_str, "unknown (%d)", hp->hsrp_op_code)));
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ND_PRINT((ndo, "%d: ", len));
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ND_TCHECK(hp->hsrp_state);
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ND_PRINT((ndo, "state=%s ", tok2str(states, "Unknown (%d)", hp->hsrp_state)));
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ND_TCHECK(hp->hsrp_group);
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ND_PRINT((ndo, "group=%d ", hp->hsrp_group));
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ND_TCHECK(hp->hsrp_reserved);
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if (hp->hsrp_reserved != 0) {
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ND_PRINT((ndo, "[reserved=%d!] ", hp->hsrp_reserved));
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}
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ND_TCHECK(hp->hsrp_virtaddr);
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ND_PRINT((ndo, "addr=%s", ipaddr_string(ndo, &hp->hsrp_virtaddr)));
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if (ndo->ndo_vflag) {
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ND_PRINT((ndo, " hellotime="));
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relts_print(ndo, hp->hsrp_hellotime);
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ND_PRINT((ndo, " holdtime="));
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relts_print(ndo, hp->hsrp_holdtime);
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ND_PRINT((ndo, " priority=%d", hp->hsrp_priority));
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ND_PRINT((ndo, " auth=\""));
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if (fn_printn(ndo, hp->hsrp_authdata, sizeof(hp->hsrp_authdata),
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ndo->ndo_snapend)) {
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ND_PRINT((ndo, "\""));
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goto trunc;
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}
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ND_PRINT((ndo, "\""));
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}
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return;
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trunc:
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ND_PRINT((ndo, "[|hsrp]"));
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}
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