epan/dissectors/packet-chargen.c

   1 /* packet-chargen.c
   2  * Routines for chargen packet dissection
   3  * Copyright 2014, Dario Lombardo <lomato@gmail.com>
   4  *
   5  * Wireshark - Network traffic analyzer
   6  * By Gerald Combs <gerald@wireshark.org>
   7  * Copyright 1998 Gerald Combs
   8  *
   9  * Chargen specs taken from RFC 864
  10  * http://tools.ietf.org/html/rfc864
  11  *
  12  * SPDX-License-Identifier: GPL-2.0-or-later
  13  */
  14
  15 #include "config.h"
  16
  17 #include <epan/packet.h>
  18 #define CHARGEN_PORT_UDP 19
  19 #define CHARGEN_PORT_TCP 19
  20
  21 void proto_register_chargen(void);
  22 void proto_reg_handoff_chargen(void);
  23
  24 static int proto_chargen = -1;
  25
  26 static int hf_chargen_data = -1;
  27
  28 static gint ett_chargen = -1;
  29
  30 /* dissect_chargen - dissects chargen packet data
  31  * tvb - tvbuff for packet data (IN)
  32  * pinfo - packet info
  33  * proto_tree - resolved protocol tree
  34  */
  35 static int
  36 dissect_chargen(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* dissector_data _U_)
  37 {
  38         proto_tree* chargen_tree;
  39         proto_item* ti;
  40         guint8* data;
  41         guint32 len;
  42
  43         col_set_str(pinfo->cinfo, COL_PROTOCOL, "Chargen");
  44         col_set_str(pinfo->cinfo, COL_INFO, "Chargen");
  45
  46         ti = proto_tree_add_item(tree, proto_chargen, tvb, 0, -1, ENC_NA);
  47         chargen_tree = proto_item_add_subtree(ti, ett_chargen);
  48
  49         len = tvb_reported_length(tvb);
  50         data = tvb_get_string_enc(wmem_packet_scope(), tvb, 0, len, ENC_ASCII);
  51
  52         proto_tree_add_string_format(chargen_tree, hf_chargen_data, tvb, 0,
  53                 len, "Data", "Data (%u): %s", len, data);
  54
  55 /*      proto_tree_add_item(chargen_tree, hf_chargen_data, tvb, 0, -1, ENC_ASCII|ENC_NA); */
  56         return tvb_captured_length(tvb);
  57 }
  58
  59 void
  60 proto_register_chargen(void)
  61 {
  62         static hf_register_info hf[] = {
  63                 { &hf_chargen_data, {
  64                         "Data", "chargen.data", FT_STRING, BASE_NONE,
  65                         NULL, 0, NULL, HFILL }}
  66                 };
  67
  68         static gint *ett[] = {
  69                 &ett_chargen,
  70         };
  71
  72         proto_chargen = proto_register_protocol("Character Generator Protocol", "Chargen",
  73             "chargen");
  74         proto_register_field_array(proto_chargen, hf, array_length(hf));
  75         proto_register_subtree_array(ett, array_length(ett));
  76 }
  77
  78 void
  79 proto_reg_handoff_chargen(void)
  80 {
  81         dissector_handle_t chargen_handle;
  82
  83         chargen_handle = create_dissector_handle(dissect_chargen, proto_chargen);
  84         dissector_add_uint_with_preference("udp.port", CHARGEN_PORT_UDP, chargen_handle);
  85         dissector_add_uint_with_preference("tcp.port", CHARGEN_PORT_TCP, chargen_handle);
  86 }
  87
  88 /*
  89  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
  90  *
  91  * Local variables:
  92  * c-basic-offset: 8
  93  * tab-width: 8
  94  * indent-tabs-mode: t
  95  * End:
  96  *
  97  * vi: set shiftwidth=8 tabstop=8 noexpandtab:
  98  * :indentSize=8:tabSize=8:noTabs=false:
  99  */