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Diffstat (limited to '')
| -rw-r--r-- | print-hsrp.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/print-hsrp.c b/print-hsrp.c new file mode 100644 index 0000000..3027826 --- /dev/null +++ b/print-hsrp.c @@ -0,0 +1,133 @@ +/* + * Copyright (C) 2001 Julian Cowley + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the project nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* \summary: Cisco Hot Standby Router Protocol (HSRP) printer */ + +/* specification: RFC 2281 for version 1 */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include "netdissect-stdinc.h" + +#include "netdissect.h" +#include "addrtoname.h" +#include "extract.h" + +/* HSRP op code types. */ +static const char *op_code_str[] = { + "hello", + "coup", + "resign" +}; + +/* HSRP states and associated names. */ +static const struct tok states[] = { + { 0, "initial" }, + { 1, "learn" }, + { 2, "listen" }, + { 4, "speak" }, + { 8, "standby" }, + { 16, "active" }, + { 0, NULL } +}; + +/* + * RFC 2281: + * + * 0 1 2 3 + * 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 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | Version | Op Code | State | Hellotime | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | Holdtime | Priority | Group | Reserved | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | Authentication Data | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | Authentication Data | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | Virtual IP Address | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + */ + +#define HSRP_AUTH_SIZE 8 + +/* HSRP protocol header. */ +struct hsrp { + nd_uint8_t hsrp_version; + nd_uint8_t hsrp_op_code; + nd_uint8_t hsrp_state; + nd_uint8_t hsrp_hellotime; + nd_uint8_t hsrp_holdtime; + nd_uint8_t hsrp_priority; + nd_uint8_t hsrp_group; + nd_uint8_t hsrp_reserved; + nd_byte hsrp_authdata[HSRP_AUTH_SIZE]; + nd_ipv4 hsrp_virtaddr; +}; + +void +hsrp_print(netdissect_options *ndo, const u_char *bp, u_int len) +{ + const struct hsrp *hp = (const struct hsrp *) bp; + uint8_t version; + + ndo->ndo_protocol = "hsrp"; + version = GET_U_1(hp->hsrp_version); + ND_PRINT("HSRPv%u", version); + if (version != 0) + return; + ND_PRINT("-"); + ND_PRINT("%s ", + tok2strary(op_code_str, "unknown (%u)", GET_U_1(hp->hsrp_op_code))); + ND_PRINT("%u: ", len); + ND_PRINT("state=%s ", + tok2str(states, "Unknown (%u)", GET_U_1(hp->hsrp_state))); + ND_PRINT("group=%u ", GET_U_1(hp->hsrp_group)); + if (GET_U_1(hp->hsrp_reserved) != 0) { + ND_PRINT("[reserved=%u!] ", GET_U_1(hp->hsrp_reserved)); + } + ND_PRINT("addr=%s", GET_IPADDR_STRING(hp->hsrp_virtaddr)); + if (ndo->ndo_vflag) { + ND_PRINT(" hellotime="); + unsigned_relts_print(ndo, GET_U_1(hp->hsrp_hellotime)); + ND_PRINT(" holdtime="); + unsigned_relts_print(ndo, GET_U_1(hp->hsrp_holdtime)); + ND_PRINT(" priority=%u", GET_U_1(hp->hsrp_priority)); + ND_PRINT(" auth=\""); + /* + * RFC 2281 Section 5.1 does not specify the encoding of + * Authentication Data explicitly, but zero padding can be + * inferred from the "recommended default value". + */ + nd_printjnp(ndo, hp->hsrp_authdata, HSRP_AUTH_SIZE); + ND_PRINT("\""); + } +} |