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+/*
+ * 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("\"");
+ }
+}