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/* packet-rip.c
* Routines for RIPv1 and RIPv2 packet disassembly
* (c) Copyright Hannes R. Boehm <hannes@boehm.org>
*
* $Id: packet-rip.c,v 1.24 2001/03/13 21:34:23 gram Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* Copyright 1998 Gerald Combs
*
*
* 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.
*/
#include "config.h"
#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"
#define UDP_PORT_RIP 520
#define RIPv1 1
#define RIPv2 2
static const value_string version_vals[] = {
{ RIPv1, "RIPv1" },
{ RIPv2, "RIPv2" },
{ 0, NULL }
};
static const value_string command_vals[] = {
{ 1, "Request" },
{ 2, "Response" },
{ 3, "Traceon" },
{ 4, "Traceoff" },
{ 5, "Vendor specific (Sun)" },
{ 0, NULL }
};
#define RIP_HEADER_LENGTH 4
#define RIP_ENTRY_LENGTH 20
static int proto_rip = -1;
static gint ett_rip = -1;
static gint ett_rip_vec = -1;
static void dissect_ip_rip_vektor(tvbuff_t *tvb, int offset, guint8 version,
proto_tree *tree);
static void dissect_rip_authentication(tvbuff_t *tvb, int offset,
proto_tree *tree);
static void
dissect_rip(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
int offset = 0;
proto_tree *rip_tree = NULL;
proto_item *ti;
guint8 command;
guint8 version;
guint16 family;
guint reported_length;
if (check_col(pinfo->fd, COL_PROTOCOL))
col_set_str(pinfo->fd, COL_PROTOCOL, "RIP");
if (check_col(pinfo->fd, COL_INFO))
col_clear(pinfo->fd, COL_INFO);
command = tvb_get_guint8(tvb, 0);
version = tvb_get_guint8(tvb, 1);
if (check_col(pinfo->fd, COL_PROTOCOL))
col_add_str(pinfo->fd, COL_PROTOCOL,
val_to_str(version, version_vals, "RIP"));
if (check_col(pinfo->fd, COL_INFO))
col_add_str(pinfo->fd, COL_INFO,
val_to_str(command, command_vals, "Unknown command (%u)"));
if (tree) {
ti = proto_tree_add_item(tree, proto_rip, tvb, 0, tvb_length(tvb), FALSE);
rip_tree = proto_item_add_subtree(ti, ett_rip);
proto_tree_add_text(rip_tree, tvb, 0, 1, "Command: %u (%s)", command,
val_to_str(command, command_vals, "Unknown"));
proto_tree_add_text(rip_tree, tvb, 1, 1, "Version: %u", version);
if (version == RIPv2)
proto_tree_add_text(rip_tree, tvb, 2, 2, "Routing Domain: %u",
tvb_get_ntohs(tvb, 2));
/* skip header */
offset = RIP_HEADER_LENGTH;
/* zero or more entries */
reported_length = tvb_reported_length(tvb);
while (offset < reported_length) {
family = tvb_get_ntohs(tvb, offset);
switch (family) {
case 2: /* IP */
dissect_ip_rip_vektor(tvb, offset, version, rip_tree);
break;
case 0xFFFF:
dissect_rip_authentication(tvb, offset, rip_tree);
break;
default:
proto_tree_add_text(rip_tree, tvb, offset,
RIP_ENTRY_LENGTH, "Unknown address family %u",
family);
break;
}
offset += RIP_ENTRY_LENGTH;
}
}
}
static void
dissect_ip_rip_vektor(tvbuff_t *tvb, int offset, guint8 version,
proto_tree *tree)
{
proto_item *ti;
proto_tree *rip_vektor_tree;
const guint8 *ip;
guint32 metric;
ip = tvb_get_ptr(tvb, offset+4, 4);
metric = tvb_get_ntohl(tvb, offset+16);
ti = proto_tree_add_text(tree, tvb, offset,
RIP_ENTRY_LENGTH, "IP Address: %s, Metric: %u",
ip_to_str(ip), metric);
rip_vektor_tree = proto_item_add_subtree(ti, ett_rip_vec);
proto_tree_add_text(rip_vektor_tree, tvb, offset, 2,
"Address Family ID: IP");
if (version == RIPv2)
proto_tree_add_text(rip_vektor_tree, tvb, offset + 2, 2,
"Route Tag: %u", tvb_get_ntohs(tvb, offset+2));
proto_tree_add_text(rip_vektor_tree, tvb, offset + 4, 4, "IP Address: %s",
ip_to_str(ip));
if (version == RIPv2) {
proto_tree_add_text(rip_vektor_tree, tvb, offset + 8, 4,
"Netmask: %s",
ip_to_str(tvb_get_ptr(tvb, offset + 8, 4)));
proto_tree_add_text(rip_vektor_tree, tvb, offset + 12, 4,
"Next Hop: %s",
ip_to_str(tvb_get_ptr(tvb, offset+12, 4)));
}
proto_tree_add_text(rip_vektor_tree, tvb, offset + 16, 4, "Metric: %u",
metric);
}
static void
dissect_rip_authentication(tvbuff_t *tvb, int offset, proto_tree *tree)
{
proto_item *ti;
proto_tree *rip_authentication_tree;
guint16 authtype;
char authentication[16];
ti = proto_tree_add_text(tree, tvb, offset, RIP_ENTRY_LENGTH,
"Authentication");
rip_authentication_tree = proto_item_add_subtree(ti, ett_rip_vec);
authtype = tvb_get_ntohs(tvb, offset + 2);
proto_tree_add_text(rip_authentication_tree, tvb, offset + 2, 2,
"Authentication type: %u", authtype);
if (authtype == 2) {
tvb_get_nstringz0(tvb, offset + 4, 16, authentication);
proto_tree_add_text(rip_authentication_tree, tvb, offset + 4, 16,
"Password: %s", authentication);
}
}
void
proto_register_rip(void)
{
/* static hf_register_info hf[] = {
{ &variable,
{ "Name", "rip.abbreviation", TYPE, VALS_POINTER }},
};*/
static gint *ett[] = {
&ett_rip,
&ett_rip_vec,
};
proto_rip = proto_register_protocol("Routing Information Protocol",
"RIP", "rip");
/* proto_register_field_array(proto_rip, hf, array_length(hf));*/
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_rip(void)
{
dissector_add("udp.port", UDP_PORT_RIP, dissect_rip, proto_rip);
}
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