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 #include "config.h"
  14
  15 #include <epan/packet.h>
  16 #include <epan/tfs.h>
  17
  18 void proto_register_daytime(void);
  19 void proto_reg_handoff_daytime(void);
  20
  21 static dissector_handle_t daytime_handle;
  22
  23 static int proto_daytime;
  24
  25 static int hf_daytime_string;
  26 static int hf_response_request;
  27
  28 static int ett_daytime;
  29
  30 /* This dissector works for TCP and UDP daytime packets */
  31 #define DAYTIME_PORT 13
  32
  33 static int
  34 dissect_daytime(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
  35 {
  36   proto_tree    *daytime_tree;
  37   proto_item    *ti;
  38
  39   col_set_str(pinfo->cinfo, COL_PROTOCOL, "DAYTIME");
  40
  41   col_add_fstr(pinfo->cinfo, COL_INFO, "DAYTIME %s",
  42     pinfo->srcport == pinfo->match_uint ? "Response":"Request");
  43
  44   if (tree) {
  45
  46     ti = proto_tree_add_item(tree, proto_daytime, tvb, 0, -1, ENC_NA);
  47     daytime_tree = proto_item_add_subtree(ti, ett_daytime);
  48
  49     proto_tree_add_boolean(daytime_tree, hf_response_request, tvb, 0, 0, pinfo->srcport==DAYTIME_PORT);
  50     if (pinfo->srcport == DAYTIME_PORT) {
  51       proto_tree_add_item(daytime_tree, hf_daytime_string, tvb, 0, -1, ENC_ASCII);
  52     }
  53   }
  54   return tvb_captured_length(tvb);
  55 }
  56
  57 void
  58 proto_register_daytime(void)
  59 {
  60   static hf_register_info hf[] = {
  61     { &hf_daytime_string,
  62       { "Daytime", "daytime.string",
  63         FT_STRING, BASE_NONE, NULL, 0x0,
  64         "String containing time and date", HFILL }
  65     },
  66     { &hf_response_request,
  67       { "Type", "daytime.response_request",
  68         FT_BOOLEAN, BASE_NONE, TFS(&tfs_response_request), 0x0,
  69         NULL, HFILL }
  70     },
  71   };
  72
  73   static int *ett[] = {
  74     &ett_daytime,
  75   };
  76
  77   proto_daytime = proto_register_protocol("Daytime Protocol", "DAYTIME", "daytime");
  78   proto_register_field_array(proto_daytime, hf, array_length(hf));
  79   proto_register_subtree_array(ett, array_length(ett));
  80
  81   daytime_handle = register_dissector("daytime", dissect_daytime, proto_daytime);
  82 }
  83
  84 void
  85 proto_reg_handoff_daytime(void)
  86 {
  87   dissector_add_uint_with_preference("udp.port", DAYTIME_PORT, daytime_handle);
  88   dissector_add_uint_with_preference("tcp.port", DAYTIME_PORT, daytime_handle);
  89 }
  90
  91 /*
  92  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
  93  *
  94  * Local Variables:
  95  * c-basic-offset: 2
  96  * tab-width: 8
  97  * indent-tabs-mode: nil
  98  * End:
  99  *
 100  * ex: set shiftwidth=2 tabstop=8 expandtab:
 101  * :indentSize=2:tabSize=8:noTabs=true:
 102  */