/* packet-amin.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
#include <stdio.h>
#include <glib.h>
#include <epan/packet.h>
#include <string.h>
#define PROTO_TAG_AMIN "AMIN"
/* Wireshark ID of the AMIN protocol */
static int proto_amin = -1;
/* These are the handles of our subdissectors */
static dissector_handle_t data_handle=NULL;
static dissector_handle_t amin_handle;
void dissect_amin(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
static int global_amin_port = 999;
static const value_string packettypenames[] = {
{ 0, "TEXT" },
{ 1, "SOMETHING_ELSE" },
{ 0, NULL }
};
/* The following hf_* variables are used to hold the Wireshark IDs of
* our header fields; they are filled out when we call
* proto_register_field_array() in proto_register_amin()
*/
//static int hf_amin_pdu = -1;
/** Kts attempt at defining the protocol */
static gint hf_amin = -1;
static gint hf_amin_header = -1;
static gint hf_amin_length = -1;
static gint hf_amin_type = -1;
static gint hf_amin_text = -1;
/* These are the ids of the subtrees that we may be creating */
static gint ett_amin = -1;
static gint ett_amin_header = -1;
static gint ett_amin_length = -1;
static gint ett_amin_type = -1;
static gint ett_amin_text = -1;
void proto_reg_handoff_amin(void)
{
static gboolean initialized=FALSE;
if (!initialized) {
data_handle = find_dissector("data");
amin_handle = create_dissector_handle(dissect_amin, proto_amin);
dissector_add("tcp.port", global_amin_port, amin_handle);
}
}
void proto_register_amin (void)
{
/* A header field is something you can search/filter on.
*
* We create a structure to register our fields. It consists of an
* array of hf_register_info structures, each of which are of the format
* {&(field id), {name, abbrev, type, display, strings, bitmask, blurb, HFILL}}.
*/
static hf_register_info hf[] = {
{ &hf_amin,
{ "Data", "amin.data", FT_NONE, BASE_NONE, NULL, 0x0,
"AMIN PDU", HFILL }},
{ &hf_amin_header,
{ "Header", "amin.header", FT_NONE, BASE_NONE, NULL, 0x0,
"AMIN Header", HFILL }},
{ &hf_amin_length,
{ "Package Length", "amin.len", FT_UINT32, BASE_DEC, NULL, 0x0,
"Package Length", HFILL }},
{ &hf_amin_type,
{ "Type", "amin.type", FT_UINT8, BASE_DEC, VALS(packettypenames), 0x0,
"Package Type", HFILL }},
{ &hf_amin_text,
{ "Text", "amin.text", FT_STRING, BASE_NONE, NULL, 0x0,
"Text", HFILL }}
};
static gint *ett[] = {
&ett_amin,
&ett_amin_header,
&ett_amin_length,
&ett_amin_type,
&ett_amin_text
};
//if (proto_amin == -1) { /* execute protocol initialization only once */
proto_amin = proto_register_protocol ("AMIN Protocol", "AMIN", "amin");
proto_register_field_array (proto_amin, hf, array_length (hf));
proto_register_subtree_array (ett, array_length (ett));
register_dissector("amin", dissect_amin, proto_amin);
//}
}
static void
dissect_amin(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *amin_item = NULL;
proto_item *amin_sub_item = NULL;
proto_tree *amin_tree = NULL;
proto_tree *amin_header_tree = NULL;
guint16 type = 0;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, PROTO_TAG_AMIN);
/* Clear out stuff in the info column */
if(check_col(pinfo->cinfo,COL_INFO)){
col_clear(pinfo->cinfo,COL_INFO);
}
// This is not a good way of dissecting packets. The tvb length should
// be sanity checked so we aren't going past the actual size of the buffer.
type = tvb_get_guint8( tvb, 4 ); // Get the type byte
if (check_col(pinfo->cinfo, COL_INFO)) {
col_add_fstr(pinfo->cinfo, COL_INFO, "%d > %d Info Type:[%s]",
pinfo->srcport, pinfo->destport,
val_to_str(type, packettypenames, "Unknown Type:0x%02x"));
}
if (tree) { /* we are being asked for details */
guint32 offset = 0;
guint32 length = 0;
amin_item = proto_tree_add_item(tree, proto_amin, tvb, 0, -1, FALSE);
amin_tree = proto_item_add_subtree(amin_item, ett_amin);
amin_header_tree = proto_item_add_subtree(amin_item, ett_amin);
amin_sub_item = proto_tree_add_item( amin_tree, hf_amin_header, tvb, offset, -1, FALSE );
amin_header_tree = proto_item_add_subtree(amin_sub_item, ett_amin);
tvb_memcpy(tvb, (guint8 *)&length, offset, 4);
proto_tree_add_uint(amin_header_tree, hf_amin_length, tvb, offset, 4, length);
offset+=4;
/** Type Byte */
proto_tree_add_item(amin_header_tree, hf_amin_type, tvb, offset, 1, FALSE);
//type = tvb_get_guint8( tvb, offset ); // Get our type byte
offset+=1;
if( type == 0 )
{
proto_tree_add_item( amin_tree, hf_amin_text, tvb, offset, length-1, FALSE );
}
}
}