epan/dissectors/packet-acap.c

   1 /* packet-acap.c
   2  * Routines for ACAP packet dissection
   3  * Copyright 2003, Brad Hards <bradh@frogmouth.net>
   4  * Heavily based in packet-imap.c, Copyright 1999, Richard Sharpe <rsharpe@ns.aus.com>
   5  *
   6  * $Id$
   7  *
   8  * Wireshark - Network traffic analyzer
   9  * By Gerald Combs <gerald@wireshark.org>
  10  * Copyright 1998 Gerald Combs
  11  *
  12  * Copied from packet-imap.c
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License
  16  * as published by the Free Software Foundation; either version 2
  17  * of the License, or (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  27  */
  28
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <stdio.h>
  34
  35 #include <string.h>
  36 #include <glib.h>
  37 #include <epan/packet.h>
  38 #include <epan/strutil.h>
  39
  40 static int proto_acap = -1;
  41 static int hf_acap_response = -1;
  42 static int hf_acap_request = -1;
  43
  44 static gint ett_acap = -1;
  45 static gint ett_acap_reqresp = -1;
  46
  47 #define TCP_PORT_ACAP                   674
  48
  49 static void
  50 dissect_acap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  51 {
  52     gboolean        is_request;
  53     proto_tree      *acap_tree, *reqresp_tree;
  54     proto_item      *ti, *hidden_item;
  55         gint                    offset = 0;
  56         const guchar    *line;
  57         gint                    next_offset;
  58         int                             linelen;
  59         int                             tokenlen;
  60         const guchar    *next_token;
  61
  62         if (check_col(pinfo->cinfo, COL_PROTOCOL))
  63                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "ACAP");
  64
  65         /*
  66          * Find the end of the first line.
  67          *
  68          * Note that "tvb_find_line_end()" will return a value that is
  69          * not longer than what's in the buffer, so the "tvb_get_ptr()"
  70          * call won't throw an exception.
  71          */
  72         linelen = tvb_find_line_end(tvb, offset, -1, &next_offset, FALSE);
  73         line = tvb_get_ptr(tvb, offset, linelen);
  74
  75         if (pinfo->match_port == pinfo->destport)
  76                 is_request = TRUE;
  77         else
  78                 is_request = FALSE;
  79
  80         if (check_col(pinfo->cinfo, COL_INFO)) {
  81                 /*
  82                  * Put the first line from the buffer into the summary
  83                  * (but leave out the line terminator).
  84                  */
  85                 col_add_fstr(pinfo->cinfo, COL_INFO, "%s: %s",
  86                     is_request ? "Request" : "Response",
  87                     format_text(line, linelen));
  88         }
  89
  90         if (tree) {
  91                 ti = proto_tree_add_item(tree, proto_acap, tvb, offset, -1,
  92                     FALSE);
  93                 acap_tree = proto_item_add_subtree(ti, ett_acap);
  94
  95                 if (is_request) {
  96                         hidden_item = proto_tree_add_boolean(acap_tree,
  97                             hf_acap_request, tvb, 0, 0, TRUE);
  98                         PROTO_ITEM_SET_HIDDEN(hidden_item);
  99                 } else {
 100                         hidden_item = proto_tree_add_boolean(acap_tree,
 101                             hf_acap_response, tvb, 0, 0, TRUE);
 102                         PROTO_ITEM_SET_HIDDEN(hidden_item);
 103                 }
 104
 105                 /*
 106                  * Put the line into the protocol tree.
 107                  */
 108                 ti = proto_tree_add_text(acap_tree, tvb, offset,
 109                     next_offset - offset, "%s",
 110                     tvb_format_text(tvb, offset, next_offset - offset));
 111                 reqresp_tree = proto_item_add_subtree(ti, ett_acap_reqresp);
 112
 113                 /*
 114                  * Show the first line as tags + requests or replies.
 115                  */
 116
 117                 /*
 118                  * Extract the first token, and, if there is a first
 119                  * token, add it as the request or reply tag.
 120                  */
 121                 tokenlen = get_token_len(line, line + linelen, &next_token);
 122                 if (tokenlen != 0) {
 123                         if (is_request) {
 124                                 proto_tree_add_text(reqresp_tree, tvb, offset,
 125                                     tokenlen, "Request Tag: %s",
 126                                     format_text(line, tokenlen));
 127                         } else {
 128                                 proto_tree_add_text(reqresp_tree, tvb, offset,
 129                                     tokenlen, "Response Tag: %s",
 130                                     format_text(line, tokenlen));
 131                         }
 132                         offset += (int)(next_token - line);
 133                         linelen -= (int)(next_token - line);
 134                         line = next_token;
 135                 }
 136
 137                 /*
 138                  * Add the rest of the line as request or reply data.
 139                  */
 140                 if (linelen != 0) {
 141                         if (is_request) {
 142                                 proto_tree_add_text(reqresp_tree, tvb, offset,
 143                                     linelen, "Request: %s",
 144                                     format_text(line, linelen));
 145                         } else {
 146                                 proto_tree_add_text(reqresp_tree, tvb, offset,
 147                                     linelen, "Response: %s",
 148                                     format_text(line, linelen));
 149                         }
 150                 }
 151
 152                 /*
 153                  * XXX - show the rest of the frame; this requires that
 154                  * we handle literals, quoted strings, continuation
 155                  * responses, etc..
 156                  *
 157                  * This involves a state machine, and attaching
 158                  * state information to the packets.
 159                  */
 160         }
 161 }
 162
 163 void
 164 proto_register_acap(void)
 165 {
 166   static hf_register_info hf[] = {
 167     { &hf_acap_response,
 168       { "Response",           "acap.response",
 169         FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 170         "TRUE if ACAP response", HFILL }},
 171
 172     { &hf_acap_request,
 173       { "Request",            "acap.request",
 174         FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 175         "TRUE if ACAP request", HFILL }}
 176   };
 177   static gint *ett[] = {
 178     &ett_acap,
 179     &ett_acap_reqresp,
 180   };
 181
 182   proto_acap = proto_register_protocol("Application Configuration Access Protocol",
 183                                        "ACAP", "acap");
 184   proto_register_field_array(proto_acap, hf, array_length(hf));
 185   proto_register_subtree_array(ett, array_length(ett));
 186 }
 187
 188 void
 189 proto_reg_handoff_acap(void)
 190 {
 191   dissector_handle_t acap_handle;
 192
 193   acap_handle = create_dissector_handle(dissect_acap, proto_acap);
 194   dissector_add("tcp.port", TCP_PORT_ACAP, acap_handle);
 195 }