epan/dissectors/packet-irc.c

   1 /* packet-irc.c
   2  * Routines for IRC packet dissection
   3  *
   4  * See
   5  *
   6  *      http://www.irchelp.org/irchelp/rfc/
   7  *
   8  * and the RFCs and other documents it mentions, such as RFC 1459, RFCs
   9  * 2810, 2811, 2812, and 2813,
  10  *
  11  *      http://www.irchelp.org/irchelp/rfc/ctcpspec.html
  12  *
  13  * and
  14  *
  15  *      http://www.invlogic.com/irc/ctcp.html
  16  *
  17  * $Id$
  18  *
  19  * Wireshark - Network traffic analyzer
  20  * By Gerald Combs <gerald@wireshark.org>
  21  * Copyright 1998 Gerald Combs
  22  *
  23  * Copied from packet-tftp.c
  24  *
  25  * This program is free software; you can redistribute it and/or
  26  * modify it under the terms of the GNU General Public License
  27  * as published by the Free Software Foundation; either version 2
  28  * of the License, or (at your option) any later version.
  29  *
  30  * This program is distributed in the hope that it will be useful,
  31  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  32  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  33  * GNU General Public License for more details.
  34  *
  35  * You should have received a copy of the GNU General Public License
  36  * along with this program; if not, write to the Free Software
  37  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  38  */
  39
  40 #ifdef HAVE_CONFIG_H
  41 # include "config.h"
  42 #endif
  43
  44 #include <stdio.h>
  45
  46 #include <string.h>
  47 #include <glib.h>
  48 #include <epan/packet.h>
  49
  50 static int proto_irc = -1;
  51 static int hf_irc_request = -1;
  52 static int hf_irc_response = -1;
  53
  54 static gint ett_irc = -1;
  55
  56 #define TCP_PORT_IRC                    6667
  57         /* good candidate for dynamic port specification */
  58
  59 static void
  60 dissect_irc_request(proto_tree *tree, tvbuff_t *tvb, int offset, int linelen)
  61 {
  62         proto_tree_add_item(tree, hf_irc_request, tvb, offset, linelen, TRUE);
  63 }
  64
  65 static void
  66 dissect_irc_response(proto_tree *tree, tvbuff_t *tvb, int offset, int linelen)
  67 {
  68         proto_tree_add_item(tree, hf_irc_response, tvb, offset, linelen, TRUE);
  69 }
  70
  71 static void
  72 dissect_irc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  73 {
  74         proto_tree      *irc_tree, *ti;
  75         gint            offset = 0;
  76         gint            next_offset;
  77         int             linelen;
  78
  79         if (check_col(pinfo->cinfo, COL_PROTOCOL))
  80                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "IRC");
  81
  82         if (check_col(pinfo->cinfo, COL_INFO))
  83         {
  84                 col_set_str(pinfo->cinfo, COL_INFO,
  85                     (pinfo->match_port == pinfo->destport) ? "Request" : "Response");
  86         }
  87
  88         if (tree)
  89         {
  90                 ti = proto_tree_add_item(tree, proto_irc, tvb, 0, -1, FALSE);
  91                 irc_tree = proto_item_add_subtree(ti, ett_irc);
  92
  93                 /*
  94                  * Process the packet data, a line at a time.
  95                  */
  96                 while (tvb_reported_length_remaining(tvb, offset) > 0)
  97                 {
  98                         /*
  99                          * Find the end of the line.
 100                          */
 101                         linelen = tvb_find_line_end(tvb, offset, -1, &next_offset, FALSE);
 102                         if (next_offset == offset) {
 103                                 /*
 104                                  * XXX - we really want the "show data a
 105                                  * line at a time" loops in various
 106                                  * dissectors to do reassembly and to
 107                                  * throw an exception if there's no
 108                                  * line ending in the current packet
 109                                  * and we're not doing reassembly.
 110                                  */
 111                                 break;
 112                         }
 113
 114                         if (linelen != 0)
 115                         {
 116                                 if (pinfo->match_port == pinfo->destport)
 117                                 {
 118                                         dissect_irc_request(irc_tree, tvb, offset, linelen);
 119                                 }
 120                                 else
 121                                 {
 122                                         dissect_irc_response(irc_tree, tvb, offset, linelen);
 123                                 }
 124                         }
 125                         offset = next_offset;
 126                 }
 127         }
 128 }
 129
 130 void
 131 proto_register_irc(void)
 132 {
 133         static hf_register_info hf[] = {
 134           { &hf_irc_response,
 135             { "Response",           "irc.response",
 136               FT_STRING, BASE_NONE, NULL, 0x0,
 137               "Line of response message", HFILL }},
 138
 139           { &hf_irc_request,
 140             { "Request",            "irc.request",
 141               FT_STRING, BASE_NONE, NULL, 0x0,
 142               "Line of request message", HFILL }},
 143         };
 144
 145         static gint *ett[] = {
 146                 &ett_irc,
 147         };
 148         proto_irc = proto_register_protocol("Internet Relay Chat", "IRC", "irc");
 149         proto_register_field_array(proto_irc, hf, array_length(hf));
 150         proto_register_subtree_array(ett, array_length(ett));
 151 }
 152
 153 void
 154 proto_reg_handoff_irc(void)
 155 {
 156         dissector_handle_t irc_handle;
 157
 158         irc_handle = create_dissector_handle(dissect_irc, proto_irc);
 159         dissector_add("tcp.port", TCP_PORT_IRC, irc_handle);
 160 }