packet-irc.c

   1 /* packet-irc.c
   2  * Routines for IRC packet dissection
   3  *
   4  * $Id: packet-irc.c,v 1.18 2002/01/24 09:20:48 guy Exp $
   5  *
   6  * Ethereal - Network traffic analyzer
   7  * By Gerald Combs <gerald@ethereal.com>
   8  * Copyright 1998 Gerald Combs
   9  *
  10  * Copied from packet-tftp.c
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  25  */
  26
  27 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #include <stdio.h>
  32
  33 #ifdef HAVE_SYS_TYPES_H
  34 # include <sys/types.h>
  35 #endif
  36
  37 #ifdef HAVE_NETINET_IN_H
  38 # include <netinet/in.h>
  39 #endif
  40
  41 #include <string.h>
  42 #include <glib.h>
  43 #include <epan/packet.h>
  44
  45 static int proto_irc = -1;
  46 static int hf_irc_request = -1;
  47 static int hf_irc_response = -1;
  48 static int hf_irc_command = -1;
  49
  50 static gint ett_irc = -1;
  51
  52 #define TCP_PORT_IRC                    6667
  53         /* good candidate for dynamic port specification */
  54
  55 static void
  56 dissect_irc_request(proto_tree *tree, tvbuff_t *tvb, int offset, int len,
  57     const char *line, int linelen)
  58 {
  59         proto_tree_add_boolean_hidden(tree, hf_irc_request, tvb, offset, len,
  60             TRUE);
  61         proto_tree_add_text(tree, tvb, offset, len, "Request Line: %.*s",
  62             linelen, line);
  63 }
  64
  65 static void
  66 dissect_irc_response(proto_tree *tree, tvbuff_t *tvb, int offset, int len,
  67     const char *line, int linelen)
  68 {
  69         proto_tree_add_boolean_hidden(tree, hf_irc_response, tvb, offset, len,
  70             TRUE);
  71         proto_tree_add_text(tree, tvb, offset, len, "Response Line: %.*s",
  72             linelen, line);
  73 }
  74
  75 static void
  76 dissect_irc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  77 {
  78         proto_tree      *irc_tree, *ti;
  79         gint            offset = 0;
  80         const u_char    *line;
  81         gint            next_offset;
  82         int             linelen;
  83
  84         if (check_col(pinfo->cinfo, COL_PROTOCOL))
  85                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "IRC");
  86
  87         if (check_col(pinfo->cinfo, COL_INFO))
  88         {
  89                 col_set_str(pinfo->cinfo, COL_INFO,
  90                     (pinfo->match_port == pinfo->destport) ? "Request" : "Response");
  91         }
  92
  93         if (tree)
  94         {
  95                 ti = proto_tree_add_item(tree, proto_irc, tvb, 0, -1, FALSE);
  96                 irc_tree = proto_item_add_subtree(ti, ett_irc);
  97
  98                 /*
  99                  * Process the packet data, a line at a time.
 100                  */
 101                 while (tvb_offset_exists(tvb, offset))
 102                 {
 103                         /*
 104                          * Find the end of the line.
 105                          */
 106                         linelen = tvb_find_line_end(tvb, offset, -1,
 107                             &next_offset);
 108
 109                         /*
 110                          * Get a buffer that refers to the line (without
 111                          * the line terminator).
 112                          */
 113                         line = tvb_get_ptr(tvb, offset, linelen);
 114
 115                         if (linelen != 0)
 116                         {
 117                                 if (pinfo->match_port == pinfo->destport)
 118                                 {
 119                                         dissect_irc_request(irc_tree, tvb,
 120                                             offset, next_offset - offset,
 121                                             line, linelen);
 122                                 }
 123                                 else
 124                                 {
 125                                         dissect_irc_response(irc_tree, tvb,
 126                                             offset, next_offset - offset,
 127                                             line, linelen);
 128                                 }
 129                         }
 130                         offset = next_offset;
 131                 }
 132         }
 133 }
 134
 135 void
 136 proto_register_irc(void)
 137 {
 138         static hf_register_info hf[] = {
 139           { &hf_irc_response,
 140             { "Response",           "irc.response",
 141               FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 142               "TRUE if IRC response", HFILL }},
 143
 144           { &hf_irc_request,
 145             { "Request",            "irc.request",
 146               FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 147               "TRUE if IRC request", HFILL }},
 148
 149           { &hf_irc_command,
 150             { "Command",            "irc.command",
 151               FT_STRING, BASE_NONE, NULL, 0x0,
 152               "Command associated with request", HFILL }}
 153         };
 154
 155         static gint *ett[] = {
 156                 &ett_irc,
 157         };
 158         proto_irc = proto_register_protocol("Internet Relay Chat", "IRC", "irc");
 159         proto_register_field_array(proto_irc, hf, array_length(hf));
 160         proto_register_subtree_array(ett, array_length(ett));
 161 }
 162
 163 void
 164 proto_reg_handoff_irc(void)
 165 {
 166         dissector_handle_t irc_handle;
 167
 168         irc_handle = create_dissector_handle(dissect_irc, proto_irc);
 169         dissector_add("tcp.port", TCP_PORT_IRC, irc_handle);
 170 }