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/* packet-hsrp.c
* Routines for the Cisco Hot Standby Router Protocol (HSRP)
* RFC2281
*
* Heikki Vatiainen <hessu@cs.tut.fi>
*
* $Id: packet-hsrp.c,v 1.6 2000/08/07 03:20:36 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* 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
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#include <glib.h>
#include "packet.h"
static gint proto_hsrp = -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"}
};
#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"}
};
static void
dissect_hsrp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
{
struct hsrp_packet hsrp;
gboolean short_packet = FALSE;
if (sizeof(struct hsrp_packet) > END_OF_FRAME)
short_packet = TRUE;
else
memcpy(&hsrp, pd + offset, sizeof(struct hsrp_packet));
if (check_col(fd, COL_PROTOCOL))
col_add_str(fd, COL_PROTOCOL, "HSRP");
if (check_col(fd, COL_INFO)) {
if (short_packet)
col_add_fstr(fd, COL_INFO, "Short packet, length %u", END_OF_FRAME);
else
col_add_fstr(fd, COL_INFO, "%s (state %s)",
val_to_str(hsrp.opcode, hsrp_opcode_vals, "Unknown"),
val_to_str(hsrp.state, hsrp_state_vals, "Unknown"));
}
if (tree) {
proto_item *ti;
proto_tree *hsrp_tree;
guint8 auth_buf[sizeof(hsrp.auth_data) + 1];
if (short_packet) {
old_dissect_data(pd, offset, fd, tree);
return;
}
ti = proto_tree_add_item(tree, proto_hsrp, NullTVB, offset, END_OF_FRAME, FALSE);
hsrp_tree = proto_item_add_subtree(ti, ett_hsrp);
proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "Version: %u", hsrp.version);
proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "Opcode: %u (%s)", hsrp.opcode,
val_to_str(hsrp.opcode, hsrp_opcode_vals, "Unknown"));
proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "State: %u (%s)", hsrp.state,
val_to_str(hsrp.state, hsrp_state_vals, "Unknown"));
proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "Hellotime: %u second%s (%sdefault)",
hsrp.hellotime, plurality(hsrp.hellotime, "", "s"),
(hsrp.hellotime == HSRP_DEFAULT_HELLOTIME) ? "" : "non-");
proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "Holdtime: %u second%s (%sdefault)",
hsrp.holdtime, plurality(hsrp.holdtime, "", "s"),
(hsrp.holdtime == HSRP_DEFAULT_HOLDTIME) ? "" : "non-");
proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "Priority: %u", hsrp.priority);
proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "Group: %u", hsrp.group);
proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "Reserved: 0x%x", hsrp.reserved);
memcpy(auth_buf, hsrp.auth_data, sizeof(hsrp.auth_data));
auth_buf[sizeof(auth_buf)] = '\0';
proto_tree_add_text(hsrp_tree, NullTVB, offset, 8, "Authentication Data: `%s'", auth_buf);
offset+=8;
proto_tree_add_text(hsrp_tree, NullTVB, offset++, 4, "Virtual IP address: %s",
ip_to_str((guint8 *)&hsrp.virt_ip_addr));
}
return;
}
void proto_register_hsrp(void)
{
static gint *ett[] = {
&ett_hsrp,
};
proto_hsrp = proto_register_protocol("Cisco Hot Standby Router Protocol", "hsrp");
proto_register_subtree_array(ett, array_length(ett));
return;
}
void
proto_reg_handoff_hsrp(void)
{
old_dissector_add("udp.port", UDP_PORT_HSRP, dissect_hsrp);
}
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