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/* packet-eigrp.c
*
* $Id: packet-eigrp.c,v 1.6 2000/08/13 14:08:09 deniel 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.
*/
#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"
#include "resolv.h"
#include "packet-atalk.h"
#include "packet-ip.h"
#include "packet-ipx.h"
/* EIGRP Structs and Definitions. */
/* EIGRP Opcodes */
#define EIGRP_UPDATE 0x01
#define EIGRP_REQUEST 0x02
#define EIGRP_QUERY 0x03
#define EIGRP_REPLY 0x04
#define EIGRP_HELLO 0x05
typedef struct _e_eigrp
{
guint8 eigrp_version;
guint8 eigrp_opcode;
guint16 eigrp_checksum;
guint16 eigrp_subnets;
guint16 eigrp_networks;
guint32 eigrp_sequence;
guint32 eigrp_asnumber;
guint8 eigrp_type1;
guint8 eigrp_subtype1;
guint16 eigrp_length1;
guint16 eigrp_holdtime;
guint8 eigrp_type2;
guint8 eigrp_subtype2;
guint16 eigrp_length2;
guint8 eigrp_level;
guint16 eigrp_dummy;
} e_eigrp;
static int proto_eigrp = -1;
static gint ett_eigrp = -1;
static const value_string eigrp_opcode_vals[] = {
{ EIGRP_HELLO, "Hello/Ack" },
{ EIGRP_UPDATE, "Update" },
{ EIGRP_REPLY, "Reply" },
{ EIGRP_QUERY, "Query" },
{ EIGRP_REQUEST, "Request" },
{ 0, NULL }
};
static void
dissect_eigrp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
e_eigrp ih;
proto_tree *eigrp_tree;
proto_item *ti;
guint16 cksum;
OLD_CHECK_DISPLAY_AS_DATA(proto_eigrp, pd, offset, fd, tree);
/* Avoids alignment problems on many architectures. */
memcpy(&ih, &pd[offset], sizeof(e_eigrp));
/* To do: check for runts, errs, etc. */
cksum = ntohs(ih.eigrp_checksum);
if (check_col(fd, COL_PROTOCOL))
col_add_str(fd, COL_PROTOCOL, "EIGRP");
if (check_col(fd, COL_INFO))
col_add_str(fd, COL_INFO,
val_to_str( ih.eigrp_opcode, eigrp_opcode_vals, "Unknown (0x%04x)"));
if (tree) {
ti = proto_tree_add_item(tree, proto_eigrp, NullTVB, offset, END_OF_FRAME, FALSE);
eigrp_tree = proto_item_add_subtree(ti, ett_eigrp);
proto_tree_add_text(eigrp_tree, NullTVB, offset, 1, "Version: %u", ih.eigrp_version);
proto_tree_add_text(eigrp_tree, NullTVB, offset + 1, 1, "Opcode: %u (%s)", ih.eigrp_opcode,
val_to_str( ih.eigrp_opcode, eigrp_opcode_vals, "Unknown") );
proto_tree_add_text(eigrp_tree, NullTVB, offset + 2, 2, "Checksum: 0x%x", cksum);
proto_tree_add_text(eigrp_tree, NullTVB, offset + 4, 2, "Subnets in local net: %u", ih.eigrp_subnets);
proto_tree_add_text(eigrp_tree, NullTVB, offset + 6, 2, "Networks in Autonomous System: %d", ih.eigrp_networks);
proto_tree_add_text(eigrp_tree, NullTVB, offset + 8, 4, "Sequence Number: 0x%x", ih.eigrp_sequence);
proto_tree_add_text(eigrp_tree, NullTVB, offset + 12, 4, "Autonomous System number: %u", ih.eigrp_asnumber);
}
}
void
proto_register_eigrp(void)
{
static gint *ett[] = {
&ett_eigrp,
};
proto_eigrp = proto_register_protocol("Enhanced Interior Gateway Routing Protocol", "eigrp");
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_eigrp(void)
{
old_dissector_add("ip.proto", IP_PROTO_EIGRP, dissect_eigrp);
old_dissector_add("ddp.type", DDP_EIGRP, dissect_eigrp);
old_dissector_add("ipx.socket", IPX_SOCKET_EIGRP, dissect_eigrp);
}
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