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packet-acap.c

/* packet-acap.c
 * Routines for ACAP packet dissection
 * Copyright 2003, Brad Hards <bradh@frogmouth.net>
 * Heavily based in packet-imap.c, Copyright 1999, Richard Sharpe <rsharpe@ns.aus.com>
 *
 * $Id: packet-acap.c 18196 2006-05-21 04:49:01Z sahlberg $
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * Copied from packet-imap.c
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <stdio.h>

#include <string.h>
#include <glib.h>
#include <epan/packet.h>
#include <epan/strutil.h>

static int proto_acap = -1;
static int hf_acap_response = -1;
static int hf_acap_request = -1;

static gint ett_acap = -1;
static gint ett_acap_reqresp = -1;

#define TCP_PORT_ACAP               674

static void
dissect_acap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
        gboolean        is_request;
        proto_tree      *acap_tree, *reqresp_tree;
        proto_item      *ti;
      gint        offset = 0;
      const guchar      *line;
      gint        next_offset;
      int         linelen;
      int         tokenlen;
      const guchar      *next_token;

      if (check_col(pinfo->cinfo, COL_PROTOCOL))
            col_set_str(pinfo->cinfo, COL_PROTOCOL, "ACAP");

      /*
       * Find the end of the first line.
       *
       * Note that "tvb_find_line_end()" will return a value that is
       * not longer than what's in the buffer, so the "tvb_get_ptr()"
       * call won't throw an exception.
       */
      linelen = tvb_find_line_end(tvb, offset, -1, &next_offset, FALSE);
      line = tvb_get_ptr(tvb, offset, linelen);

      if (pinfo->match_port == pinfo->destport)
            is_request = TRUE;
      else
            is_request = FALSE;

      if (check_col(pinfo->cinfo, COL_INFO)) {
            /*
             * Put the first line from the buffer into the summary
             * (but leave out the line terminator).
             */
            col_add_fstr(pinfo->cinfo, COL_INFO, "%s: %s",
                is_request ? "Request" : "Response",
                format_text(line, linelen));
      }

      if (tree) {
            ti = proto_tree_add_item(tree, proto_acap, tvb, offset, -1,
                FALSE);
            acap_tree = proto_item_add_subtree(ti, ett_acap);

            if (is_request) {
                  proto_tree_add_boolean_hidden(acap_tree,
                      hf_acap_request, tvb, 0, 0, TRUE);
            } else {
                  proto_tree_add_boolean_hidden(acap_tree,
                      hf_acap_response, tvb, 0, 0, TRUE);
            }

            /*
             * Put the line into the protocol tree.
             */
            ti = proto_tree_add_text(acap_tree, tvb, offset,
                next_offset - offset, "%s",
                tvb_format_text(tvb, offset, next_offset - offset));
            reqresp_tree = proto_item_add_subtree(ti, ett_acap_reqresp);

            /*
             * Show the first line as tags + requests or replies.
             */

            /*
             * Extract the first token, and, if there is a first
             * token, add it as the request or reply tag.
             */
            tokenlen = get_token_len(line, line + linelen, &next_token);
            if (tokenlen != 0) {
                  if (is_request) {
                        proto_tree_add_text(reqresp_tree, tvb, offset,
                            tokenlen, "Request Tag: %s",
                            format_text(line, tokenlen));
                  } else {
                        proto_tree_add_text(reqresp_tree, tvb, offset,
                            tokenlen, "Response Tag: %s",
                            format_text(line, tokenlen));
                  }
                  offset += next_token - line;
                  linelen -= next_token - line;
                  line = next_token;
            }

            /*
             * Add the rest of the line as request or reply data.
             */
            if (linelen != 0) {
                  if (is_request) {
                        proto_tree_add_text(reqresp_tree, tvb, offset,
                            linelen, "Request: %s",
                            format_text(line, linelen));
                  } else {
                        proto_tree_add_text(reqresp_tree, tvb, offset,
                            linelen, "Response: %s",
                            format_text(line, linelen));
                  }
            }

            /*
             * XXX - show the rest of the frame; this requires that
             * we handle literals, quoted strings, continuation
             * responses, etc..
             *
             * This involves a state machine, and attaching
             * state information to the packets.
             */
      }
}

void
proto_register_acap(void)
{
  static hf_register_info hf[] = {
    { &hf_acap_response,
      { "Response",           "acap.response",
      FT_BOOLEAN, BASE_NONE, NULL, 0x0,
            "TRUE if ACAP response", HFILL }},

    { &hf_acap_request,
      { "Request",            "acap.request",
      FT_BOOLEAN, BASE_NONE, NULL, 0x0,
            "TRUE if ACAP request", HFILL }}
  };
  static gint *ett[] = {
    &ett_acap,
    &ett_acap_reqresp,
  };

  proto_acap = proto_register_protocol("Application Configuration Access Protocol",
                               "ACAP", "acap");
  proto_register_field_array(proto_acap, hf, array_length(hf));
  proto_register_subtree_array(ett, array_length(ett));
}

void
proto_reg_handoff_acap(void)
{
  dissector_handle_t acap_handle;

  acap_handle = create_dissector_handle(dissect_acap, proto_acap);
  dissector_add("tcp.port", TCP_PORT_ACAP, acap_handle);
}

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