epan/dissectors/packet-daytime.c

   1 /* packet-daytime.c
   2  * Routines for Daytime Protocol (RFC 867) packet dissection
   3  * Copyright 2006, Stephen Fisher (see AUTHORS file)
   4  *
   5  * Wireshark - Network traffic analyzer
   6  * By Gerald Combs <gerald@wireshark.org>
   7  * Copyright 1998 Gerald Combs
   8  *
   9  * Copied from packet-time.c
  10  *
  11  * SPDX-License-Identifier: GPL-2.0-or-later
  12  */
  13
  14 #define NEW_PROTO_TREE_API
  15
  16 #include "config.h"
  17
  18 #include <epan/packet.h>
  19
  20 void proto_register_daytime(void);
  21 void proto_reg_handoff_daytime(void);
  22
  23 static dissector_handle_t daytime_handle;
  24
  25 static header_field_info *hfi_daytime = NULL;
  26
  27 #define DAYTIME_HFI_INIT HFI_INIT(proto_daytime)
  28
  29 static header_field_info hfi_daytime_string DAYTIME_HFI_INIT =
  30 { "Daytime", "daytime.string",
  31   FT_STRING, BASE_NONE, NULL, 0x0,
  32   "String containing time and date", HFILL };
  33
  34 static header_field_info hfi_response_request DAYTIME_HFI_INIT =
  35 { "Type", "daytime.response_request",
  36   FT_BOOLEAN, 8, TFS(&tfs_response_request), 0x0,
  37   NULL, HFILL };
  38
  39 static gint ett_daytime = -1;
  40
  41 /* This dissector works for TCP and UDP daytime packets */
  42 #define DAYTIME_PORT 13
  43
  44 static int
  45 dissect_daytime(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
  46 {
  47   proto_tree    *daytime_tree;
  48   proto_item    *ti;
  49
  50   col_set_str(pinfo->cinfo, COL_PROTOCOL, "DAYTIME");
  51
  52   col_add_fstr(pinfo->cinfo, COL_INFO, "DAYTIME %s",
  53     pinfo->srcport == pinfo->match_uint ? "Response":"Request");
  54
  55   if (tree) {
  56
  57     ti = proto_tree_add_item(tree, hfi_daytime, tvb, 0, -1, ENC_NA);
  58     daytime_tree = proto_item_add_subtree(ti, ett_daytime);
  59
  60     proto_tree_add_boolean(daytime_tree, &hfi_response_request, tvb, 0, 0, pinfo->srcport==DAYTIME_PORT);
  61     if (pinfo->srcport == DAYTIME_PORT) {
  62       proto_tree_add_item(daytime_tree, &hfi_daytime_string, tvb, 0, -1, ENC_ASCII|ENC_NA);
  63     }
  64   }
  65   return tvb_captured_length(tvb);
  66 }
  67
  68 void
  69 proto_register_daytime(void)
  70 {
  71 #ifndef HAVE_HFI_SECTION_INIT
  72   static header_field_info *hfi[] = {
  73     &hfi_daytime_string,
  74     &hfi_response_request,
  75   };
  76 #endif
  77
  78   static gint *ett[] = {
  79     &ett_daytime,
  80   };
  81
  82   int proto_daytime;
  83
  84   proto_daytime = proto_register_protocol("Daytime Protocol", "DAYTIME", "daytime");
  85   hfi_daytime = proto_registrar_get_nth(proto_daytime);
  86
  87   proto_register_fields(proto_daytime, hfi, array_length(hfi));
  88   proto_register_subtree_array(ett, array_length(ett));
  89
  90   daytime_handle = create_dissector_handle(dissect_daytime, proto_daytime);
  91 }
  92
  93 void
  94 proto_reg_handoff_daytime(void)
  95 {
  96   dissector_add_uint_with_preference("udp.port", DAYTIME_PORT, daytime_handle);
  97   dissector_add_uint_with_preference("tcp.port", DAYTIME_PORT, daytime_handle);
  98 }
  99
 100 /*
 101  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 102  *
 103  * Local Variables:
 104  * c-basic-offset: 2
 105  * tab-width: 8
 106  * indent-tabs-mode: nil
 107  * End:
 108  *
 109  * ex: set shiftwidth=2 tabstop=8 expandtab:
 110  * :indentSize=2:tabSize=8:noTabs=true:
 111  */