mirror of
https://github.com/the-tcpdump-group/tcpdump.git
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139 lines
4.6 KiB
C
139 lines
4.6 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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/* \summary: Cisco Hot Standby Router Protocol (HSRP) printer */
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/* specification: RFC 2281 for version 1 */
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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 "netdissect-stdinc.h"
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#include "netdissect.h"
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#include "addrtoname.h"
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#include "extract.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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nd_uint8_t hsrp_version;
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nd_uint8_t hsrp_op_code;
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nd_uint8_t hsrp_state;
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nd_uint8_t hsrp_hellotime;
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nd_uint8_t hsrp_holdtime;
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nd_uint8_t hsrp_priority;
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nd_uint8_t hsrp_group;
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nd_uint8_t hsrp_reserved;
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nd_byte hsrp_authdata[HSRP_AUTH_SIZE];
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nd_ipv4 hsrp_virtaddr;
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};
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void
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hsrp_print(netdissect_options *ndo, const u_char *bp, u_int len)
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{
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const struct hsrp *hp = (const struct hsrp *) bp;
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uint8_t version;
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ND_TCHECK_1(hp->hsrp_version);
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version = EXTRACT_U_1(hp->hsrp_version);
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ND_PRINT("HSRPv%u", version);
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if (version != 0)
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return;
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ND_TCHECK_1(hp->hsrp_op_code);
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ND_PRINT("-");
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ND_PRINT("%s ", tok2strary(op_code_str, "unknown (%u)", EXTRACT_U_1(hp->hsrp_op_code)));
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ND_PRINT("%u: ", len);
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ND_TCHECK_1(hp->hsrp_state);
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ND_PRINT("state=%s ", tok2str(states, "Unknown (%u)", EXTRACT_U_1(hp->hsrp_state)));
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ND_TCHECK_1(hp->hsrp_group);
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ND_PRINT("group=%u ", EXTRACT_U_1(hp->hsrp_group));
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ND_TCHECK_1(hp->hsrp_reserved);
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if (EXTRACT_U_1(hp->hsrp_reserved) != 0) {
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ND_PRINT("[reserved=%u!] ", EXTRACT_U_1(hp->hsrp_reserved));
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}
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ND_TCHECK_4(hp->hsrp_virtaddr);
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ND_PRINT("addr=%s", ipaddr_string(ndo, hp->hsrp_virtaddr));
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if (ndo->ndo_vflag) {
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ND_PRINT(" hellotime=");
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unsigned_relts_print(ndo, EXTRACT_U_1(hp->hsrp_hellotime));
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ND_PRINT(" holdtime=");
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unsigned_relts_print(ndo, EXTRACT_U_1(hp->hsrp_holdtime));
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ND_PRINT(" priority=%u", EXTRACT_U_1(hp->hsrp_priority));
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ND_PRINT(" 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("\"");
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goto trunc;
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}
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ND_PRINT("\"");
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}
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return;
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trunc:
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ND_PRINT("[|hsrp]");
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}
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