osmith/wireshark
1
0
Fork 0
forked from osmocom/wireshark
Code Pull requests Releases Wiki Activity
wireshark/packet-hsrp.c
Guy Harris 9f2c88966a Remove more "CHECK_DISPLAY_AS_DATA()" calls and "pinfo->current_proto =" 
statements.

Move the setting of the Protocol column in various dissectors before
anything is fetched from the packet, and also clear the Info column at
that point in those and some other dissectors, so that if an exception
is thrown, the columns don't reflect the previous protocol.

Make the IP dissector static, as it's called only via dissector tables
or dissector handles.  Also make the "dissect the TOS field as the
DiffServ DS field" flag static, as it's not referred to outside of
"packet-ip.c".

In the NCP dissector, refer to the port type through "pinfo" rather than
through the global "pi", as it's a tvbuffified dissector.

svn path=/trunk/; revision=2929
2001-01-22 03:33:45 +00:00

247 lines
9.1 KiB
C
Raw Blame History

/* packet-hsrp.c
* Routines for the Cisco Hot Standby Router Protocol (HSRP)
* RFC 2281
*
* Heikki Vatiainen <hessu@cs.tut.fi>
*
* $Id: packet-hsrp.c,v 1.16 2001/01/22 03:33:45 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 <string.h>
#include <glib.h>
#include "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->fd, COL_PROTOCOL))
col_set_str(pinfo->fd, COL_PROTOCOL, "HSRP");
if (check_col(pinfo->fd, COL_INFO))
col_clear(pinfo->fd, COL_INFO);
opcode = tvb_get_guint8(tvb, 1);
state = tvb_get_guint8(tvb, 2);
if (check_col(pinfo->fd, COL_INFO)) {
col_add_fstr(pinfo->fd, 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];
guint32 virt_ip_addr;
offset = 0;
ti = proto_tree_add_item(tree, proto_hsrp, tvb, offset, tvb_length(tvb), FALSE);
hsrp_tree = proto_item_add_subtree(ti, ett_hsrp);
proto_tree_add_uint(hsrp_tree, hf_hsrp_version, tvb, offset, 1, tvb_get_guint8(tvb, offset));
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, tvb_get_guint8(tvb, offset));
offset++;
proto_tree_add_item(hsrp_tree, hf_hsrp_group, tvb, offset, 1, tvb_get_guint8(tvb, offset));
offset++;
proto_tree_add_item(hsrp_tree, hf_hsrp_reserved, tvb, offset, 1, tvb_get_guint8(tvb, offset));
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;
tvb_memcpy(tvb, (guint8 *)&virt_ip_addr, offset, 4);
proto_tree_add_ipv4(hsrp_tree, hf_hsrp_virt_ip_addr, tvb, offset, 4, virt_ip_addr);
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"}},
{ &hf_hsrp_opcode,
{ "Op Code", "hsrp.opcode",
FT_UINT8, BASE_DEC, VALS(hsrp_opcode_vals), 0x0,
"The type of message contained in this packet" }},
{ &hf_hsrp_state,
{ "State", "hsrp.state",
FT_UINT8, BASE_DEC, VALS(hsrp_state_vals), 0x0,
"The current state of the router sending the message" }},
{ &hf_hsrp_hellotime,
{ "Hellotime", "hsrp.hellotime",
FT_UINT8, BASE_DEC, NULL, 0x0,
"The approximate period between the Hello messages that the router sends" }},
{ &hf_hsrp_holdtime,
{ "Holdtime", "hsrp.holdtime",
FT_UINT8, BASE_DEC, NULL, 0x0,
"Time that the current Hello message should be considered valid" }},
{ &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" }},
{ &hf_hsrp_group,
{ "Group", "hsrp.group",
FT_UINT8, BASE_DEC, NULL, 0x0,
"This field identifies the standby group" }},
{ &hf_hsrp_reserved,
{ "Reserved", "hsrp.reserved",
FT_UINT8, BASE_DEC, NULL, 0x0,
"Reserved" }},
{ &hf_hsrp_auth_data,
{ "Authentication Data", "hsrp.auth_data",
FT_STRING, 0, NULL, 0x0,
"Contains a clear-text 8 character reused password" }},
{ &hf_hsrp_virt_ip_addr,
{ "Virtual IP Address", "hsrp.virt_ip",
FT_IPv4, 0, NULL, 0x0,
"The virtual IP address used by this group" }},
};
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_add("udp.port", UDP_PORT_HSRP, dissect_hsrp, proto_hsrp);
}
View git blame Copy permalink