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/* packet-dcc.c
* Routines for Distributed Checksum Clearinghouse packet dissection
* DCC Home: http://www.rhyolite.com/anti-spam/dcc/
*
* Copyright 1999, Nathan Neulinger <nneul@umr.edu>
*
* $Id: packet-dccp.c,v 1.2 2002/05/03 16:23:25 nneul Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
*
* Copied from packet-tftp.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>
#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 <epan/packet.h>
#include <packet-dccp.h>
static int proto_dccp = -1;
static int hf_dccp_len = -1;
static int hf_dccp_pkt_vers = -1;
static int hf_dccp_op = -1;
static int hf_dccp_clientid = -1;
static int hf_dccp_opnums_host = -1;
static int hf_dccp_opnums_pid = -1;
static int hf_dccp_opnums_report = -1;
static int hf_dccp_opnums_retrans = -1;
static gint ett_dccp = -1;
/* Lookup string tables */
static const value_string dccp_op_vals[] = {
{DCC_OP_INVALID, "Invalid Op"},
{DCC_OP_NOP, "No-Op"},
{DCC_OP_REPORT, "Report and Query"},
{DCC_OP_QUERY, "Query"},
{DCC_OP_QUERY_RESP, "Server Response"},
{DCC_OP_ADMN, "Admin Op"},
{DCC_OP_OK, "Admin Op Ok"},
{DCC_OP_ERROR, "Server Failing"},
{DCC_OP_DELETE, "Delete Checksum(s)"},
{0, NULL}
};
static gboolean
dissect_dccp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *dccp_tree, *ti;
int offset = 0;
int client_is_le = 0;
if (pinfo->srcport != DCC_PORT && pinfo->destport != DCC_PORT) {
/* Not the right port - not a DCC packet. */
return FALSE;
}
/* get at least a full packet structure */
if ( !tvb_bytes_exist(tvb, 0, sizeof(DCC_HDR)) ) {
/* Doesn't have enough bytes to contain packet header. */
return FALSE;
}
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "DCCP");
offset = 0;
if (check_col(pinfo->cinfo, COL_INFO)) {
col_add_fstr(pinfo->cinfo, COL_INFO,
"%s: %s",
( pinfo->destport == DCC_PORT ) ? "Request" : "Response",
val_to_str(tvb_get_guint8(tvb, offset+3),
dccp_op_vals, "Unknown Op: %u")
);
}
if (tree) {
ti = proto_tree_add_item(tree, proto_dccp, tvb, offset, -1,
FALSE);
dccp_tree = proto_item_add_subtree(ti, ett_dccp);
proto_tree_add_item(dccp_tree, hf_dccp_len, tvb,
offset, 2, FALSE);
if ( !tvb_bytes_exist(tvb, 0, tvb_get_ntohs(tvb, offset))) {
/* Doesn't have number of bytes that header claims. */
proto_tree_add_text(dccp_tree, tvb, offset, 2, "Error - packet is shorter than header claims!");
}
offset += 2;
proto_tree_add_item(dccp_tree, hf_dccp_pkt_vers, tvb,
offset, 1, FALSE);
offset += 1;
proto_tree_add_item(dccp_tree, hf_dccp_op, tvb,
offset, 1, FALSE);
offset += 1;
proto_tree_add_item(dccp_tree, hf_dccp_clientid, tvb,
offset, 4, FALSE);
offset += 4;
/* Note - these are indeterminate - they are sortof considered opaque to the client */
/* Make some attempt to figure out if this data is little endian, not guaranteed to be
correct if connection went through a firewall or similar. */
/* Very hokey check - if all three of pid/report/retrans look like little-endian
numbers, host is probably little endian. Probably innacurate on super-heavily-used
DCC clients though. This should be good enough for now. */
client_is_le = ( (tvb_get_guint8(tvb, offset+4) | tvb_get_guint8(tvb, offset+4)) &&
(tvb_get_guint8(tvb, offset+8) | tvb_get_guint8(tvb, offset+9)) &&
(tvb_get_guint8(tvb, offset+12) | tvb_get_guint8(tvb, offset+13)) );
proto_tree_add_item(dccp_tree, hf_dccp_opnums_host, tvb,
offset, 4, client_is_le);
offset += 4;
proto_tree_add_item(dccp_tree, hf_dccp_opnums_pid, tvb,
offset, 4, client_is_le);
offset += 4;
proto_tree_add_item(dccp_tree, hf_dccp_opnums_report, tvb,
offset, 4, client_is_le);
offset += 4;
proto_tree_add_item(dccp_tree, hf_dccp_opnums_retrans, tvb,
offset, 4, client_is_le);
offset += 4;
}
return TRUE;
}
void
proto_register_dccp(void)
{
static hf_register_info hf[] = {
{ &hf_dccp_len, {
"Packet Length", "dcc.len", FT_UINT16, BASE_DEC,
NULL, 0, "Packet Length", HFILL }},
{ &hf_dccp_pkt_vers, {
"Packet Version", "dcc.pkt_vers", FT_UINT16, BASE_DEC,
NULL, 0, "Packet Version", HFILL }},
{ &hf_dccp_op, {
"Operation Type", "dcc.op", FT_UINT8, BASE_DEC,
VALS(dccp_op_vals), 0, "Operation Type", HFILL }},
{ &hf_dccp_clientid, {
"Client ID", "dcc.clientid", FT_UINT32, BASE_DEC,
NULL, 0, "Client ID", HFILL }},
{ &hf_dccp_opnums_host, {
"OpNums: Host", "dcc.opnums.host", FT_IPv4, BASE_DEC,
NULL, 0, "OpNums: Host", HFILL }},
{ &hf_dccp_opnums_pid, {
"OpNums: Process ID", "dcc.opnums.pid", FT_UINT32, BASE_DEC,
NULL, 0, "OpNums: Process ID", HFILL }},
{ &hf_dccp_opnums_report, {
"OpNums: Report", "dcc.opnums.report", FT_UINT32, BASE_DEC,
NULL, 0, "OpNums: Report", HFILL }},
{ &hf_dccp_opnums_retrans, {
"OpNums: Retransmission", "dcc.opnums.retrans", FT_UINT32, BASE_DEC,
NULL, 0, "OpNums: Retransmission", HFILL }},
};
static gint *ett[] = {
&ett_dccp,
};
proto_dccp = proto_register_protocol("Distributed Checksum Clearinghouse Prototocl",
"DCCP", "dccp");
proto_register_field_array(proto_dccp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_dccp(void)
{
heur_dissector_add("udp", dissect_dccp, proto_dccp);
}
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