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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  27  */
  28
  29 #define NEW_PROTO_TREE_API
  30
  31 #include "config.h"
  32
  33 #include <glib.h>
  34 #include <epan/packet.h>
  35 #include <epan/strutil.h>
  36
  37 /* Forward declarations */
  38 void proto_register_acap(void);
  39 void proto_reg_handoff_acap(void);
  40
  41 static dissector_handle_t acap_handle;
  42
  43 static header_field_info *hfi_acap = NULL;
  44
  45 #define HFI_ACAP HFI_INIT(proto_acap)
  46
  47 static header_field_info hfi_acap_response HFI_ACAP =
  48                   { "Response",           "acap.response",
  49                     FT_BOOLEAN, BASE_NONE, NULL, 0x0,
  50                     "TRUE if ACAP response", HFILL };
  51
  52 static header_field_info hfi_acap_request HFI_ACAP =
  53                   { "Request",            "acap.request",
  54                     FT_BOOLEAN, BASE_NONE, NULL, 0x0,
  55                     "TRUE if ACAP request", HFILL };
  56
  57
  58 static gint ett_acap = -1;
  59 static gint ett_acap_reqresp = -1;
  60
  61 #define TCP_PORT_ACAP                   674
  62
  63 static void
  64 dissect_acap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  65 {
  66         gboolean        is_request;
  67         proto_tree      *acap_tree, *reqresp_tree;
  68         proto_item      *ti, *hidden_item;
  69         gint                    offset = 0;
  70         const guchar    *line;
  71         gint                    next_offset;
  72         int                             linelen;
  73         int                             tokenlen;
  74         const guchar    *next_token;
  75
  76         col_set_str(pinfo->cinfo, COL_PROTOCOL, "ACAP");
  77
  78         /*
  79          * Find the end of the first line.
  80          *
  81          * Note that "tvb_find_line_end()" will return a value that is
  82          * not longer than what's in the buffer, so the "tvb_get_ptr()"
  83          * call won't throw an exception.
  84          */
  85         linelen = tvb_find_line_end(tvb, offset, -1, &next_offset, FALSE);
  86         line = tvb_get_ptr(tvb, offset, linelen);
  87
  88         if (pinfo->match_uint == pinfo->destport)
  89                 is_request = TRUE;
  90         else
  91                 is_request = FALSE;
  92
  93         /*
  94          * Put the first line from the buffer into the summary
  95          * (but leave out the line terminator).
  96          */
  97         col_add_fstr(pinfo->cinfo, COL_INFO, "%s: %s",
  98             is_request ? "Request" : "Response",
  99             format_text(line, linelen));
 100
 101         if (tree) {
 102                 ti = proto_tree_add_item(tree, hfi_acap, tvb, offset, -1,
 103                     ENC_NA);
 104                 acap_tree = proto_item_add_subtree(ti, ett_acap);
 105
 106                 if (is_request) {
 107                         hidden_item = proto_tree_add_boolean(acap_tree,
 108                             &hfi_acap_request, tvb, 0, 0, TRUE);
 109                         PROTO_ITEM_SET_HIDDEN(hidden_item);
 110                 } else {
 111                         hidden_item = proto_tree_add_boolean(acap_tree,
 112                             &hfi_acap_response, tvb, 0, 0, TRUE);
 113                         PROTO_ITEM_SET_HIDDEN(hidden_item);
 114                 }
 115
 116                 /*
 117                  * Put the line into the protocol tree.
 118                  */
 119                 ti = proto_tree_add_text(acap_tree, tvb, offset,
 120                     next_offset - offset, "%s",
 121                     tvb_format_text(tvb, offset, next_offset - offset));
 122                 reqresp_tree = proto_item_add_subtree(ti, ett_acap_reqresp);
 123
 124                 /*
 125                  * Show the first line as tags + requests or replies.
 126                  */
 127
 128                 /*
 129                  * Extract the first token, and, if there is a first
 130                  * token, add it as the request or reply tag.
 131                  */
 132                 tokenlen = get_token_len(line, line + linelen, &next_token);
 133                 if (tokenlen != 0) {
 134                         if (is_request) {
 135                                 proto_tree_add_text(reqresp_tree, tvb, offset,
 136                                     tokenlen, "Request Tag: %s",
 137                                     format_text(line, tokenlen));
 138                         } else {
 139                                 proto_tree_add_text(reqresp_tree, tvb, offset,
 140                                     tokenlen, "Response Tag: %s",
 141                                     format_text(line, tokenlen));
 142                         }
 143                         offset += (int)(next_token - line);
 144                         linelen -= (int)(next_token - line);
 145                         line = next_token;
 146                 }
 147
 148                 /*
 149                  * Add the rest of the line as request or reply data.
 150                  */
 151                 if (linelen != 0) {
 152                         if (is_request) {
 153                                 proto_tree_add_text(reqresp_tree, tvb, offset,
 154                                     linelen, "Request: %s",
 155                                     format_text(line, linelen));
 156                         } else {
 157                                 proto_tree_add_text(reqresp_tree, tvb, offset,
 158                                     linelen, "Response: %s",
 159                                     format_text(line, linelen));
 160                         }
 161                 }
 162
 163                 /*
 164                  * XXX - show the rest of the frame; this requires that
 165                  * we handle literals, quoted strings, continuation
 166                  * responses, etc..
 167                  *
 168                  * This involves a state machine, and attaching
 169                  * state information to the packets.
 170                  */
 171         }
 172 }
 173
 174 void
 175 proto_register_acap(void)
 176 {
 177 #ifndef HAVE_HFI_SECTION_INIT
 178         static header_field_info *hfi[] = {
 179                 &hfi_acap_response,
 180                 &hfi_acap_request,
 181         };
 182 #endif
 183
 184         static gint *ett[] = {
 185                 &ett_acap,
 186                 &ett_acap_reqresp,
 187         };
 188
 189         int proto_acap;
 190
 191         proto_acap = proto_register_protocol("Application Configuration Access Protocol",
 192                                              "ACAP", "acap");
 193         hfi_acap = proto_registrar_get_nth(proto_acap);
 194
 195         proto_register_fields(proto_acap, hfi, array_length(hfi));
 196         proto_register_subtree_array(ett, array_length(ett));
 197
 198         acap_handle = create_dissector_handle(dissect_acap, proto_acap);
 199 }
 200
 201 void
 202 proto_reg_handoff_acap(void)
 203 {
 204         dissector_add_uint("tcp.port", TCP_PORT_ACAP, acap_handle);
 205 }