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-rw-r--r--epan/dissectors/packet-hsrp.c239
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diff --git a/epan/dissectors/packet-hsrp.c b/epan/dissectors/packet-hsrp.c
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+/* packet-hsrp.c
+ * Routines for the Cisco Hot Standby Router Protocol (HSRP)
+ * RFC 2281
+ *
+ * Heikki Vatiainen <hessu@cs.tut.fi>
+ *
+ * $Id$
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@ethereal.com>
+ * Copyright 1998 Gerald Combs
+ *
+ * Copied from packet-vrrp.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <string.h>
+#include <glib.h>
+#include <epan/packet.h>
+
+static gint proto_hsrp = -1;
+
+static gint hf_hsrp_version = -1;
+static gint hf_hsrp_opcode = -1;
+static gint hf_hsrp_state = -1;
+static gint hf_hsrp_hellotime = -1;
+static gint hf_hsrp_holdtime = -1;
+static gint hf_hsrp_priority = -1;
+static gint hf_hsrp_group = -1;
+static gint hf_hsrp_reserved = -1;
+static gint hf_hsrp_auth_data = -1;
+static gint hf_hsrp_virt_ip_addr = -1;
+
+static gint ett_hsrp = -1;
+
+#define UDP_PORT_HSRP 1985
+
+struct hsrp_packet { /* Multicast to 224.0.0.2, TTL 1, UDP, port 1985 */
+ guint8 version; /* RFC2281 describes version 0 */
+ guint8 opcode;
+ guint8 state;
+#define HSRP_DEFAULT_HELLOTIME 3
+ guint8 hellotime; /* In seconds */
+#define HSRP_DEFAULT_HOLDTIME 10
+ guint8 holdtime; /* In seconds */
+ guint8 priority; /* Higher is stronger, highest IP address tie-breaker */
+ guint8 group; /* Identifies the standby group */
+ guint8 reserved;
+ guint8 auth_data[8]; /* Clear-text password, recommended default is `cisco' */
+ guint32 virt_ip_addr; /* The virtual IP address used by this group */
+};
+
+
+#define HSRP_OPCODE_HELLO 0
+#define HSRP_OPCODE_COUP 1
+#define HSRP_OPCODE_RESIGN 2
+static const value_string hsrp_opcode_vals[] = {
+ {HSRP_OPCODE_HELLO, "Hello"},
+ {HSRP_OPCODE_COUP, "Coup"},
+ {HSRP_OPCODE_RESIGN, "Resign"},
+ {0, NULL},
+};
+
+#define HSRP_STATE_INITIAL 0
+#define HSRP_STATE_LEARN 1
+#define HSRP_STATE_LISTEN 2
+#define HSRP_STATE_SPEAK 4
+#define HSRP_STATE_STANDBY 8
+#define HSRP_STATE_ACTIVE 16
+static const value_string hsrp_state_vals[] = {
+ {HSRP_STATE_INITIAL, "Initial"},
+ {HSRP_STATE_LEARN, "Learn"},
+ {HSRP_STATE_LISTEN, "Listen"},
+ {HSRP_STATE_SPEAK, "Speak"},
+ {HSRP_STATE_STANDBY, "Standby"},
+ {HSRP_STATE_ACTIVE, "Active"},
+ {0, NULL},
+};
+
+static void
+dissect_hsrp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+ guint8 opcode, state;
+
+ if (check_col(pinfo->cinfo, COL_PROTOCOL))
+ col_set_str(pinfo->cinfo, COL_PROTOCOL, "HSRP");
+ if (check_col(pinfo->cinfo, COL_INFO))
+ col_clear(pinfo->cinfo, COL_INFO);
+
+ opcode = tvb_get_guint8(tvb, 1);
+ state = tvb_get_guint8(tvb, 2);
+ if (check_col(pinfo->cinfo, COL_INFO)) {
+ col_add_fstr(pinfo->cinfo, COL_INFO, "%s (state %s)",
+ val_to_str(opcode, hsrp_opcode_vals, "Unknown"),
+ val_to_str(state, hsrp_state_vals, "Unknown"));
+ }
+
+ if (tree) {
+ proto_item *ti;
+ proto_tree *hsrp_tree;
+ int offset;
+ guint8 hellotime, holdtime;
+ guint8 auth_buf[8 + 1];
+
+ offset = 0;
+ ti = proto_tree_add_item(tree, proto_hsrp, tvb, offset, -1, FALSE);
+ hsrp_tree = proto_item_add_subtree(ti, ett_hsrp);
+
+ proto_tree_add_item(hsrp_tree, hf_hsrp_version, tvb, offset, 1, FALSE);
+ offset++;
+ proto_tree_add_uint(hsrp_tree, hf_hsrp_opcode, tvb, offset, 1, opcode);
+ offset++;
+ proto_tree_add_uint(hsrp_tree, hf_hsrp_state, tvb, offset, 1, state);
+ offset++;
+ hellotime = tvb_get_guint8(tvb, offset);
+ proto_tree_add_uint_format(hsrp_tree, hf_hsrp_hellotime, tvb, offset, 1, hellotime,
+ "Hellotime: %sDefault (%u)",
+ (hellotime == HSRP_DEFAULT_HELLOTIME) ? "" : "Non-",
+ hellotime);
+ offset++;
+ holdtime = tvb_get_guint8(tvb, offset);
+ proto_tree_add_uint_format(hsrp_tree, hf_hsrp_holdtime, tvb, offset, 1, holdtime,
+ "Holdtime: %sDefault (%u)",
+ (holdtime == HSRP_DEFAULT_HOLDTIME) ? "" : "Non-",
+ holdtime);
+ offset++;
+ proto_tree_add_item(hsrp_tree, hf_hsrp_priority, tvb, offset, 1, FALSE);
+ offset++;
+ proto_tree_add_item(hsrp_tree, hf_hsrp_group, tvb, offset, 1, FALSE);
+ offset++;
+ proto_tree_add_item(hsrp_tree, hf_hsrp_reserved, tvb, offset, 1, FALSE);
+ offset++;
+ tvb_memcpy(tvb, auth_buf, offset, 8);
+ auth_buf[sizeof auth_buf - 1] = '\0';
+ proto_tree_add_string_format(hsrp_tree, hf_hsrp_auth_data, tvb, offset, 8, auth_buf,
+ "Authentication Data: %sDefault (%s)",
+ (tvb_strneql(tvb, offset, "cisco", strlen("cisco"))) == 0 ? "" : "Non-",
+ auth_buf);
+ offset += 8;
+ proto_tree_add_item(hsrp_tree, hf_hsrp_virt_ip_addr, tvb, offset, 4, FALSE);
+ offset += 4;
+
+ }
+
+ return;
+}
+
+void proto_register_hsrp(void)
+{
+ static hf_register_info hf[] = {
+ { &hf_hsrp_version,
+ { "Version", "hsrp.version",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "The version of the HSRP messages", HFILL }},
+
+ { &hf_hsrp_opcode,
+ { "Op Code", "hsrp.opcode",
+ FT_UINT8, BASE_DEC, VALS(hsrp_opcode_vals), 0x0,
+ "The type of message contained in this packet", HFILL }},
+
+ { &hf_hsrp_state,
+ { "State", "hsrp.state",
+ FT_UINT8, BASE_DEC, VALS(hsrp_state_vals), 0x0,
+ "The current state of the router sending the message", HFILL }},
+
+ { &hf_hsrp_hellotime,
+ { "Hellotime", "hsrp.hellotime",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "The approximate period between the Hello messages that the router sends", HFILL }},
+
+ { &hf_hsrp_holdtime,
+ { "Holdtime", "hsrp.holdtime",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "Time that the current Hello message should be considered valid", HFILL }},
+
+ { &hf_hsrp_priority,
+ { "Priority", "hsrp.priority",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "Used to elect the active and standby routers. Numerically higher priority wins vote", HFILL }},
+
+ { &hf_hsrp_group,
+ { "Group", "hsrp.group",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "This field identifies the standby group", HFILL }},
+
+ { &hf_hsrp_reserved,
+ { "Reserved", "hsrp.reserved",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "Reserved", HFILL }},
+
+ { &hf_hsrp_auth_data,
+ { "Authentication Data", "hsrp.auth_data",
+ FT_STRING, 0, NULL, 0x0,
+ "Contains a clear-text 8 character reused password", HFILL }},
+
+ { &hf_hsrp_virt_ip_addr,
+ { "Virtual IP Address", "hsrp.virt_ip",
+ FT_IPv4, 0, NULL, 0x0,
+ "The virtual IP address used by this group", HFILL }},
+
+ };
+
+ static gint *ett[] = {
+ &ett_hsrp,
+ };
+
+ proto_hsrp = proto_register_protocol("Cisco Hot Standby Router Protocol",
+ "HSRP", "hsrp");
+ proto_register_field_array(proto_hsrp, hf, array_length(hf));
+ proto_register_subtree_array(ett, array_length(ett));
+
+ return;
+}
+
+void
+proto_reg_handoff_hsrp(void)
+{
+ dissector_handle_t hsrp_handle;
+
+ hsrp_handle = create_dissector_handle(dissect_hsrp, proto_hsrp);
+ dissector_add("udp.port", UDP_PORT_HSRP, hsrp_handle);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-08 15:32:24 +0000