308 lines
9.3 KiB
C
308 lines
9.3 KiB
C
/* packet-miop.c
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* Routines for CORBA MIOP packet disassembly
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* Significantly based on packet-giop.c
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* Copyright 2009 Alvaro Vega Garcia <avega at tid dot es>
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*
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* According with Unreliable Multicast Draft Adopted Specification
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* 2001 October (OMG)
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* Chapter 29: Unreliable Multicast Inter-ORB Protocol (MIOP)
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* http://www.omg.org/technology/documents/specialized_corba.htm
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/emem.h>
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#include <epan/expert.h>
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#include "packet-giop.h"
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#include "packet-tcp.h"
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/*
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* Useful visible data/structs
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*/
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#define MIOP_MAX_UNIQUE_ID_LENGTH 252
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#define MIOP_HEADER_SIZE 16
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/*
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* Set to 1 for DEBUG output - TODO make this a runtime option
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*/
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#define DEBUG 0
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/*
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* ------------------------------------------------------------------------------------------+
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* Data/Variables/Structs
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* ------------------------------------------------------------------------------------------+
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*/
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static int proto_miop = -1;
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/*
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* (sub)Tree declares
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*/
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static gint hf_miop_magic = -1;
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static gint hf_miop_hdr_version = -1;
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static gint hf_miop_flags = -1;
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static gint hf_miop_packet_length = -1;
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static gint hf_miop_packet_number = -1;
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static gint hf_miop_number_of_packets = -1;
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static gint hf_miop_unique_id_len = -1;
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static gint hf_miop_unique_id = -1;
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static gint ett_miop = -1;
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#define MIOP_MAGIC "MIOP"
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static void dissect_miop (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree);
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static gboolean
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dissect_miop_heur (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, void * data _U_) {
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guint tot_len;
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/* check magic number and version */
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tot_len = tvb_length(tvb);
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if (tot_len < MIOP_HEADER_SIZE) /* tot_len < 16 */
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{
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/* Not enough data captured to hold the GIOP header; don't try
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to interpret it as GIOP. */
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return FALSE;
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}
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if ( tvb_memeql(tvb, 0, MIOP_MAGIC ,4) != 0)
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return FALSE;
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if (pinfo->ptype != PT_UDP)
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return FALSE;
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dissect_miop (tvb, pinfo, tree);
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/* TODO: make reasembly */
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return TRUE;
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}
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/* Main entry point */
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static void dissect_miop (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree) {
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guint offset = 0;
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proto_tree *miop_tree = NULL;
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proto_item *ti;
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guint8 hdr_version;
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guint version_major;
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guint version_minor;
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guint8 flags;
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guint16 packet_length;
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guint packet_number;
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guint number_of_packets;
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guint byte_order;
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guint32 unique_id_len;
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emem_strbuf_t *flags_strbuf = ep_strbuf_new_label("none");
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col_set_str (pinfo->cinfo, COL_PROTOCOL, MIOP_MAGIC);
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/* Clear out stuff in the info column */
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col_clear(pinfo->cinfo, COL_INFO);
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/* Extract major and minor version numbers */
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hdr_version = tvb_get_guint8(tvb, 4);
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version_major = ((hdr_version & 0xf0) >> 4);
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version_minor = (hdr_version & 0x0f);
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if (hdr_version != 16)
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{
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col_add_fstr (pinfo->cinfo, COL_INFO, "Version %u.%u",
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version_major, version_minor);
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if (tree)
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{
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ti = proto_tree_add_item (tree, proto_miop, tvb, 0, -1, ENC_NA);
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miop_tree = proto_item_add_subtree (ti, ett_miop);
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proto_tree_add_text (miop_tree, tvb, 0, -1,
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"Version %u.%u",
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version_major, version_minor);
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expert_add_info_format(pinfo, ti, PI_UNDECODED, PI_WARN,
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"MIOP version %u.%u not supported",
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version_major, version_minor);
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}
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return;
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}
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flags = tvb_get_guint8(tvb, 5);
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byte_order = (flags & 0x01) ? ENC_LITTLE_ENDIAN : ENC_BIG_ENDIAN;
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if (byte_order == ENC_BIG_ENDIAN) {
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packet_length = tvb_get_ntohs(tvb, 6);
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packet_number = tvb_get_ntohl(tvb, 8);
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number_of_packets = tvb_get_ntohl(tvb, 12);
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unique_id_len = tvb_get_ntohl(tvb, 16);
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}
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else {
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packet_length = tvb_get_letohs(tvb, 6);
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packet_number = tvb_get_letohl(tvb, 8);
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number_of_packets = tvb_get_letohl(tvb, 12);
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unique_id_len = tvb_get_letohl(tvb, 16);
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}
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col_add_fstr (pinfo->cinfo, COL_INFO, "MIOP %u.%u Packet s=%d (%u of %u)",
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version_major, version_minor, packet_length,
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packet_number + 1,
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number_of_packets);
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if (tree)
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{
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ti = proto_tree_add_item (tree, proto_miop, tvb, 0, -1, ENC_NA);
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miop_tree = proto_item_add_subtree (ti, ett_miop);
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/* XXX - Should we bail out if we don't have the right magic number? */
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proto_tree_add_item(miop_tree, hf_miop_magic, tvb, offset, 4, ENC_ASCII|ENC_NA);
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offset += 4;
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proto_tree_add_uint_format(miop_tree, hf_miop_hdr_version, tvb, offset, 1, hdr_version,
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"Version: %u.%u", version_major, version_minor);
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offset++;
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if (flags & 0x01) {
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ep_strbuf_printf(flags_strbuf, "little-endian");
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}
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if (flags & 0x02) {
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ep_strbuf_append_printf(flags_strbuf, "%s%s",
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flags_strbuf->len ? ", " : "", "last message");
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}
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proto_tree_add_uint_format_value(miop_tree, hf_miop_flags, tvb, offset, 1,
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flags, "0x%02x (%s)", flags, flags_strbuf->str);
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offset++;
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proto_tree_add_item(miop_tree, hf_miop_packet_length, tvb, offset, 2, byte_order);
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offset += 2;
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proto_tree_add_item(miop_tree, hf_miop_packet_number, tvb, offset, 4, byte_order);
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offset += 4;
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proto_tree_add_item(miop_tree, hf_miop_number_of_packets, tvb, offset, 4, byte_order);
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offset += 4;
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ti = proto_tree_add_item(miop_tree, hf_miop_unique_id_len, tvb, offset, 4, byte_order);
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if (unique_id_len >= MIOP_MAX_UNIQUE_ID_LENGTH) {
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expert_add_info_format(pinfo, ti, PI_MALFORMED, PI_WARN,
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"Unique Id length (%u) exceeds max value (%u)",
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unique_id_len, MIOP_MAX_UNIQUE_ID_LENGTH);
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return;
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}
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offset += 4;
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proto_tree_add_item(miop_tree, hf_miop_unique_id, tvb, offset, unique_id_len,
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byte_order);
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if (packet_number == 0) {
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/* It is the first packet of the collection
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We can call to GIOP dissector to show more about this first
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uncompleted GIOP message
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*/
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tvbuff_t *payload_tvb;
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offset += unique_id_len;
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payload_tvb = tvb_new_subset_remaining (tvb, offset);
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dissect_giop(payload_tvb, pinfo, tree);
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}
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}
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}
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void proto_register_miop (void) {
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/* A header field is something you can search/filter on.
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*
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* We create a structure to register our fields. It consists of an
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* array of hf_register_info structures, each of which are of the format
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* {&(field id), {name, abbrev, type, display, strings, bitmask, blurb, HFILL}}.
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*/
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static hf_register_info hf[] = {
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{ &hf_miop_magic,
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{ "Magic", "miop.magic", FT_STRING, BASE_NONE, NULL, 0x0,
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"PacketHeader magic", HFILL }},
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{ &hf_miop_hdr_version,
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{ "Version", "miop.hdr_version", FT_UINT8, BASE_HEX, NULL, 0x0,
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"PacketHeader hdr_version", HFILL }},
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{ &hf_miop_flags,
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{ "Flags", "miop.flags", FT_UINT8, BASE_OCT, NULL, 0x0,
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"PacketHeader flags", HFILL }},
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{ &hf_miop_packet_length,
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{ "Length", "miop.packet_length", FT_UINT16, BASE_DEC, NULL, 0x0,
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"PacketHeader packet_length", HFILL }},
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{ &hf_miop_packet_number,
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{ "PacketNumber", "miop.packet_number", FT_UINT32, BASE_DEC, NULL, 0x0,
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"PacketHeader packet_number", HFILL }},
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{ &hf_miop_number_of_packets,
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{ "NumberOfPackets", "miop.number_of_packets", FT_UINT32, BASE_DEC, NULL, 0x0,
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"PacketHeader number_of_packets", HFILL }},
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{ &hf_miop_unique_id_len,
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{ "UniqueIdLength", "miop.unique_id_len", FT_UINT32, BASE_DEC, NULL, 0x0,
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"UniqueId length", HFILL }},
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{ &hf_miop_unique_id,
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{ "UniqueId", "miop.unique_id", FT_BYTES, BASE_NONE, NULL, 0x0,
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"UniqueId id", HFILL }},
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};
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static gint *ett[] = {
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&ett_miop
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};
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proto_miop = proto_register_protocol("Unreliable Multicast Inter-ORB Protocol", "MIOP",
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"miop");
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proto_register_field_array (proto_miop, hf, array_length (hf));
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proto_register_subtree_array (ett, array_length (ett));
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register_dissector("miop", dissect_miop, proto_miop);
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}
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void proto_reg_handoff_miop (void) {
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dissector_handle_t miop_handle;
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miop_handle = find_dissector("miop");
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dissector_add_handle("udp.port", miop_handle); /* for 'Decode As' */
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heur_dissector_add("udp", dissect_miop_heur, proto_miop);
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}
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