123 lines
3.4 KiB
C
123 lines
3.4 KiB
C
/* packet-rmt-common.c
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* Reliable Multicast Transport (RMT)
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* Common RMT functions
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* Copyright 2005, Stefano Pettini <spettini@users.sourceforge.net>
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/strutil.h>
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#include "packet-rmt-common.h"
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/* Boolean string tables */
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const true_false_string boolean_set_notset = { "Set", "Not set" };
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const true_false_string boolean_yes_no = { "Yes", "No" };
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/* Common RMT exported functions */
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/* ============================= */
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/* Scan the tvb and put extensions found in an array */
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void rmt_ext_parse(GArray *a, tvbuff_t *tvb, guint *offset, guint offset_max)
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{
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struct _ext e;
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while (*offset < offset_max)
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{
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/* Clear the temporary extension */
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memset(&e, 0, sizeof(struct _ext));
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/* Dissect the extension */
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e.offset = *offset;
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e.het = tvb_get_guint8(tvb, *offset);
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if (e.het <= 127) {
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/* If HET <= 127, we have a variable-size extention */
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e.hel = tvb_get_guint8(tvb, *offset+1);
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e.hec_offset = *offset + 2;
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e.hec_size = e.hel * 4 - 2;
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e.length = e.hel * 4;
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} else {
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/* If HET > 127, we have a short 32-bit extention */
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e.hel = 1; /* even if HEL field is not defined for HET > 127 */
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e.hec_offset = *offset + 1;
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e.hec_size = 3;
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e.length = 4;
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}
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/* Prevents infinite loops */
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if (e.length == 0)
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break;
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g_array_append_val(a, e);
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*offset += e.length;
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}
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}
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/* Add default items to a subtree */
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void rmt_ext_decode_default_header(struct _ext *e, tvbuff_t *tvb, proto_tree *tree)
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{
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if (tree)
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{
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proto_tree_add_text(tree, tvb, e->offset, 1, "Header Extension Type (HET): %u", e->het);
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if (e->het <= 127)
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proto_tree_add_text(tree, tvb, e->offset+1, 1, "Header Extension Length (HEL): %u", e->hel);
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}
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}
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/* Add a default subtree to a tree item */
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void rmt_ext_decode_default_subtree(struct _ext *e, tvbuff_t *tvb, proto_item *ti, gint ett)
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{
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proto_tree *ext_tree;
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ext_tree = proto_item_add_subtree(ti, ett);
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rmt_ext_decode_default_header(e, tvb, ext_tree);
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if (ext_tree)
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proto_tree_add_text(ext_tree, tvb, e->hec_offset, e->hec_size,
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"Header Extension Content (HEC): %s", tvb_bytes_to_str(tvb, e->hec_offset, e->hec_size));
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}
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/* Add a default subtree for unknown extensions */
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void rmt_ext_decode_default(struct _ext *e, tvbuff_t *tvb, proto_tree *tree, gint ett)
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{
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proto_item *ti;
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if (tree)
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{
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ti = proto_tree_add_text(tree, tvb, e->offset, e->length,
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"Unknown extension (%u)", e->het);
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rmt_ext_decode_default_subtree(e, tvb, ti, ett);
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}
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}
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