epan/dissectors/packet-echo.c

   1 /* packet-echo.c
   2  * Routines for ECHO packet disassembly (RFC862)
   3  *
   4  * Only useful to mark the packets as ECHO in the summary and in the
   5  * protocol hierarchy statistics (since not so many fields to decode ;-)
   6  *
   7  * Laurent Deniel <laurent.deniel@free.fr>
   8  *
   9  * $Id$
  10  *
  11  * Wireshark - Network traffic analyzer
  12  * By Gerald Combs <gerald@wireshark.org>
  13  * Copyright 1998 Gerald Combs
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License
  17  * as published by the Free Software Foundation; either version 2
  18  * of the License, or (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  28  */
  29
  30 #include "config.h"
  31
  32 #include <glib.h>
  33 #include <epan/packet.h>
  34
  35 #define ECHO_PORT  7
  36
  37 void proto_register_echo(void);
  38 void proto_reg_handoff_echo(void);
  39
  40 static int proto_echo = -1;
  41
  42 static int hf_echo_data = -1;
  43 static int hf_echo_request = -1;
  44 static int hf_echo_response = -1;
  45
  46 static gint ett_echo = -1;
  47
  48 static void dissect_echo(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  49 {
  50
  51   int         offset    = 0;
  52   gboolean    request   = FALSE;
  53
  54   if (pinfo->destport == ECHO_PORT) {
  55     request = TRUE;
  56   }
  57
  58   col_set_str(pinfo->cinfo, COL_PROTOCOL, "ECHO");
  59
  60   col_set_str(pinfo->cinfo, COL_INFO,
  61                 (request) ? "Request" : "Response");
  62
  63   if (tree) {
  64     proto_tree *echo_tree;
  65     proto_item *ti, *hidden_item;
  66
  67     ti = proto_tree_add_item(tree, proto_echo, tvb, offset, -1, ENC_NA);
  68     echo_tree = proto_item_add_subtree(ti, ett_echo);
  69
  70     if (request) {
  71       hidden_item = proto_tree_add_boolean(echo_tree, hf_echo_request, tvb, 0, 0, 1);
  72     } else {
  73       hidden_item = proto_tree_add_boolean(echo_tree, hf_echo_response, tvb, 0, 0, 1);
  74     }
  75     PROTO_ITEM_SET_HIDDEN(hidden_item);
  76
  77     proto_tree_add_item(echo_tree, hf_echo_data, tvb, offset, -1, ENC_NA);
  78
  79   }
  80
  81 } /* dissect_echo */
  82
  83 void proto_register_echo(void)
  84 {
  85
  86   static hf_register_info hf[] = {
  87     { &hf_echo_data,
  88       { "Echo data",    "echo.data",
  89         FT_BYTES,       BASE_NONE,      NULL,   0x0,
  90         NULL, HFILL }},
  91     { &hf_echo_request,
  92       { "Echo request", "echo.request",
  93         FT_BOOLEAN,     BASE_NONE,      NULL,   0x0,
  94         "Echo data", HFILL }},
  95     { &hf_echo_response,
  96       { "Echo response","echo.response",
  97         FT_BOOLEAN,     BASE_NONE,      NULL,   0x0,
  98         "Echo data", HFILL }}
  99   };
 100
 101   static gint *ett[] = {
 102     &ett_echo
 103   };
 104
 105   proto_echo = proto_register_protocol("Echo", "ECHO", "echo");
 106   proto_register_field_array(proto_echo, hf, array_length(hf));
 107   proto_register_subtree_array(ett, array_length(ett));
 108
 109 }
 110
 111 void proto_reg_handoff_echo(void)
 112 {
 113
 114   dissector_handle_t echo_handle;
 115
 116   echo_handle = create_dissector_handle(dissect_echo, proto_echo);
 117
 118   dissector_add_uint("udp.port", ECHO_PORT, echo_handle);
 119   dissector_add_uint("tcp.port", ECHO_PORT, echo_handle);
 120
 121 }
 122