forked from osmocom/wireshark
175 lines
6.3 KiB
C
175 lines
6.3 KiB
C
/* packet-hsrp.c
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* Routines for the Cisco Hot Standby Router Protocol (HSRP)
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* RFC2281
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*
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* Heikki Vatiainen <hessu@cs.tut.fi>
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*
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* $Id: packet-hsrp.c,v 1.10 2000/11/19 08:53:57 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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* Copied from packet-vrrp.c
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#include <string.h>
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#include <glib.h>
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#include "packet.h"
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static gint proto_hsrp = -1;
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static gint ett_hsrp = -1;
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#define UDP_PORT_HSRP 1985
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struct hsrp_packet { /* Multicast to 224.0.0.2, TTL 1, UDP, port 1985 */
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guint8 version; /* RFC2281 describes version 0 */
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guint8 opcode;
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guint8 state;
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#define HSRP_DEFAULT_HELLOTIME 3
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guint8 hellotime; /* In seconds */
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#define HSRP_DEFAULT_HOLDTIME 10
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guint8 holdtime; /* In seconds */
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guint8 priority; /* Higher is stronger, highest IP address tie-breaker */
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guint8 group; /* Identifies the standby group */
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guint8 reserved;
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guint8 auth_data[8]; /* Clear-text password, recommended default is `cisco' */
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guint32 virt_ip_addr; /* The virtual IP address used by this group */
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};
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#define HSRP_OPCODE_HELLO 0
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#define HSRP_OPCODE_COUP 1
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#define HSRP_OPCODE_RESIGN 2
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static const value_string hsrp_opcode_vals[] = {
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{HSRP_OPCODE_HELLO, "Hello"},
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{HSRP_OPCODE_COUP, "Coup"},
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{HSRP_OPCODE_RESIGN, "Resign"}
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};
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#define HSRP_STATE_INITIAL 0
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#define HSRP_STATE_LEARN 1
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#define HSRP_STATE_LISTEN 2
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#define HSRP_STATE_SPEAK 4
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#define HSRP_STATE_STANDBY 8
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#define HSRP_STATE_ACTIVE 16
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static const value_string hsrp_state_vals[] = {
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{HSRP_STATE_INITIAL, "Initial"},
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{HSRP_STATE_LEARN, "Learn"},
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{HSRP_STATE_LISTEN, "Listen"},
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{HSRP_STATE_SPEAK, "Speak"},
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{HSRP_STATE_STANDBY, "Standby"},
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{HSRP_STATE_ACTIVE, "Active"}
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};
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static void
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dissect_hsrp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
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{
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struct hsrp_packet hsrp;
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gboolean short_packet = FALSE;
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OLD_CHECK_DISPLAY_AS_DATA(proto_hsrp, pd, offset, fd, tree);
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if (sizeof(struct hsrp_packet) > END_OF_FRAME)
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short_packet = TRUE;
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else
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memcpy(&hsrp, pd + offset, sizeof(struct hsrp_packet));
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if (check_col(fd, COL_PROTOCOL))
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col_set_str(fd, COL_PROTOCOL, "HSRP");
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if (check_col(fd, COL_INFO)) {
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if (short_packet)
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col_add_fstr(fd, COL_INFO, "Short packet, length %u", END_OF_FRAME);
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else
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col_add_fstr(fd, COL_INFO, "%s (state %s)",
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val_to_str(hsrp.opcode, hsrp_opcode_vals, "Unknown"),
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val_to_str(hsrp.state, hsrp_state_vals, "Unknown"));
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}
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if (tree) {
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proto_item *ti;
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proto_tree *hsrp_tree;
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guint8 auth_buf[sizeof(hsrp.auth_data) + 1];
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if (short_packet) {
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old_dissect_data(pd, offset, fd, tree);
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return;
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}
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ti = proto_tree_add_item(tree, proto_hsrp, NullTVB, offset, END_OF_FRAME, FALSE);
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hsrp_tree = proto_item_add_subtree(ti, ett_hsrp);
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proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "Version: %u", hsrp.version);
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proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "Opcode: %u (%s)", hsrp.opcode,
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val_to_str(hsrp.opcode, hsrp_opcode_vals, "Unknown"));
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proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "State: %u (%s)", hsrp.state,
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val_to_str(hsrp.state, hsrp_state_vals, "Unknown"));
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proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "Hellotime: %u second%s (%sdefault)",
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hsrp.hellotime, plurality(hsrp.hellotime, "", "s"),
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(hsrp.hellotime == HSRP_DEFAULT_HELLOTIME) ? "" : "non-");
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proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "Holdtime: %u second%s (%sdefault)",
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hsrp.holdtime, plurality(hsrp.holdtime, "", "s"),
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(hsrp.holdtime == HSRP_DEFAULT_HOLDTIME) ? "" : "non-");
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proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "Priority: %u", hsrp.priority);
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proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "Group: %u", hsrp.group);
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proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "Reserved: 0x%x", hsrp.reserved);
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memcpy(auth_buf, hsrp.auth_data, sizeof(hsrp.auth_data));
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auth_buf[sizeof(hsrp.auth_data)] = '\0';
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proto_tree_add_text(hsrp_tree, NullTVB, offset, 8, "Authentication Data: `%s'", auth_buf);
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offset+=8;
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proto_tree_add_text(hsrp_tree, NullTVB, offset++, 4, "Virtual IP address: %s",
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ip_to_str((guint8 *)&hsrp.virt_ip_addr));
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}
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return;
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}
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void proto_register_hsrp(void)
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{
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static gint *ett[] = {
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&ett_hsrp,
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};
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proto_hsrp = proto_register_protocol("Cisco Hot Standby Router Protocol", "hsrp");
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proto_register_subtree_array(ett, array_length(ett));
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return;
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}
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void
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proto_reg_handoff_hsrp(void)
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{
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old_dissector_add("udp.port", UDP_PORT_HSRP, dissect_hsrp);
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}
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