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/* packet-chargen.c
* Routines for chargen packet dissection
* Copyright 2014, Dario Lombardo <lomato@gmail.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* Chargen specs taken from RFC 864
* https://tools.ietf.org/html/rfc864
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#define CHARGEN_PORT_UDP 19
#define CHARGEN_PORT_TCP 19
void proto_register_chargen(void);
void proto_reg_handoff_chargen(void);
static dissector_handle_t chargen_handle;
static int proto_chargen;
static int hf_chargen_data;
static int ett_chargen;
/* dissect_chargen - dissects chargen packet data
* tvb - tvbuff for packet data (IN)
* pinfo - packet info
* proto_tree - resolved protocol tree
*/
static int
dissect_chargen(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* dissector_data _U_)
{
proto_tree* chargen_tree;
proto_item* ti;
uint8_t* data;
uint32_t len;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Chargen");
col_set_str(pinfo->cinfo, COL_INFO, "Chargen");
ti = proto_tree_add_item(tree, proto_chargen, tvb, 0, -1, ENC_NA);
chargen_tree = proto_item_add_subtree(ti, ett_chargen);
len = tvb_reported_length(tvb);
data = tvb_get_string_enc(pinfo->pool, tvb, 0, len, ENC_ASCII);
proto_tree_add_string_format(chargen_tree, hf_chargen_data, tvb, 0,
len, "Data", "Data (%u): %s", len, data);
/* proto_tree_add_item(chargen_tree, hf_chargen_data, tvb, 0, -1, ENC_ASCII); */
return tvb_captured_length(tvb);
}
void
proto_register_chargen(void)
{
static hf_register_info hf[] = {
{ &hf_chargen_data, {
"Data", "chargen.data", FT_STRING, BASE_NONE,
NULL, 0, NULL, HFILL }}
};
static int *ett[] = {
&ett_chargen,
};
proto_chargen = proto_register_protocol("Character Generator Protocol", "Chargen",
"chargen");
proto_register_field_array(proto_chargen, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
chargen_handle = register_dissector("chargen", dissect_chargen, proto_chargen);
}
void
proto_reg_handoff_chargen(void)
{
dissector_add_uint_with_preference("udp.port", CHARGEN_PORT_UDP, chargen_handle);
dissector_add_uint_with_preference("tcp.port", CHARGEN_PORT_TCP, chargen_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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