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wireshark/epan/dissectors/packet-ziop.c

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/* packet-ziop.c
* Routines for CORBA ZIOP packet disassembly
* Significantly based on packet-giop.c
* Copyright 2009 Alvaro Vega Garcia <avega at tid dot es>
*
* According with GIOP Compression RFP revised submission
* OMG mars/2008-12-20
* https://www.omg.org/spec/ZIOP/1.0/Beta1/PDF
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/expert.h>
#include "packet-ziop.h"
#include "packet-giop.h"
#include "packet-tcp.h"
/*
* Set to 1 for DEBUG output - TODO make this a runtime option
*/
#define DEBUG 0
void proto_reg_handoff_ziop(void);
void proto_register_ziop(void);
/*
* ------------------------------------------------------------------------------------------+
* Data/Variables/Structs
* ------------------------------------------------------------------------------------------+
*/
static int proto_ziop = -1;
/*
* (sub)Tree declares
*/
static gint hf_ziop_magic = -1;
static gint hf_ziop_giop_version_major = -1;
static gint hf_ziop_giop_version_minor = -1;
static gint hf_ziop_flags = -1;
static gint hf_ziop_message_type = -1;
static gint hf_ziop_message_size = -1;
static gint hf_ziop_compressor_id = -1;
static gint hf_ziop_original_length = -1;
static gint ett_ziop = -1;
static expert_field ei_ziop_version = EI_INIT;
static dissector_handle_t ziop_tcp_handle;
static const value_string ziop_compressor_ids[] = {
{ 0, "None" },
{ 1, "GZIP"},
{ 2, "PKZIP"},
{ 3, "BZIP2"},
{ 4, "ZLIB"},
{ 5, "LZMA"},
{ 6, "LZOP"},
{ 7, "RZIP"},
{ 8, "7X"},
{ 9, "XAR"},
{ 0, NULL}
};
static const value_string giop_message_types[] = {
{ 0x0, "Request" },
{ 0x1, "Reply"},
{ 0x2, "CancelRequest"},
{ 0x3, "LocateRequest"},
{ 0x4, "LocateReply"},
{ 0x5, "CloseConnection"},
{ 0x6, "MessageError"},
{ 0x7, "Fragment"},
{ 0, NULL}
};
static gboolean ziop_desegment = TRUE;
/* Main entry point */
static int
dissect_ziop (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, void* data _U_) {
guint offset = 0;
guint8 giop_version_major, giop_version_minor, message_type;
proto_tree *ziop_tree = NULL;
proto_item *ti;
guint8 flags;
guint byte_order;
const char *label = "none";
if (tvb_reported_length(tvb) < 7)
return 0;
col_set_str (pinfo->cinfo, COL_PROTOCOL, ZIOP_MAGIC);
/* Clear out stuff in the info column */
col_clear(pinfo->cinfo, COL_INFO);
ti = proto_tree_add_item (tree, proto_ziop, tvb, 0, -1, ENC_NA);
ziop_tree = proto_item_add_subtree (ti, ett_ziop);
proto_tree_add_item(ziop_tree, hf_ziop_magic, tvb, offset, 4, ENC_ASCII|ENC_NA);
offset += 4;
proto_tree_add_item(ziop_tree, hf_ziop_giop_version_major, tvb, offset, 1, ENC_BIG_ENDIAN);
giop_version_major = tvb_get_guint8(tvb, offset);
offset++;
proto_tree_add_item(ziop_tree, hf_ziop_giop_version_minor, tvb, offset, 1, ENC_BIG_ENDIAN);
giop_version_minor = tvb_get_guint8(tvb, offset);
offset++;
if ( (giop_version_major < 1) ||
(giop_version_minor < 2) ) /* earlier than GIOP 1.2 */
{
col_add_fstr (pinfo->cinfo, COL_INFO, "Version %u.%u",
giop_version_major, giop_version_minor);
expert_add_info_format(pinfo, ti, &ei_ziop_version,
"Version %u.%u not supported",
giop_version_major,
giop_version_minor);
call_data_dissector(tvb, pinfo, tree);
return tvb_reported_length(tvb);
}
flags = tvb_get_guint8(tvb, offset);
byte_order = (flags & 0x01) ? ENC_LITTLE_ENDIAN : ENC_BIG_ENDIAN;
if (flags & 0x01) {
label = "little-endian";
}
proto_tree_add_uint_format_value(ziop_tree, hf_ziop_flags, tvb, offset, 1,
flags, "0x%02x (%s)", flags, label);
offset++;
proto_tree_add_item(ziop_tree, hf_ziop_message_type, tvb, offset, 1, ENC_BIG_ENDIAN);
message_type = tvb_get_guint8(tvb, offset);
offset++;
col_add_fstr (pinfo->cinfo, COL_INFO, "ZIOP %u.%u %s",
giop_version_major,
giop_version_minor,
val_to_str(message_type, giop_message_types,
"Unknown message type (0x%02x)")
);
proto_tree_add_item(ziop_tree, hf_ziop_message_size, tvb, offset, 4, byte_order);
offset += 4;
proto_tree_add_item(ziop_tree, hf_ziop_compressor_id, tvb, offset, 2, byte_order);
offset += 4;
proto_tree_add_item(ziop_tree, hf_ziop_original_length, tvb, offset, 4, byte_order);
return tvb_reported_length(tvb);
}
static guint
get_ziop_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset, void *data _U_)
{
guint8 flags;
guint message_size;
gboolean stream_is_big_endian;
if ( tvb_memeql(tvb, 0, (const guint8 *)ZIOP_MAGIC, 4) != 0)
return 0;
flags = tvb_get_guint8(tvb, offset + 6);
stream_is_big_endian = ((flags & 0x1) == 0);
if (stream_is_big_endian)
message_size = tvb_get_ntohl(tvb, offset + 8);
else
message_size = tvb_get_letohl(tvb, offset + 8);
return message_size + ZIOP_HEADER_SIZE;
}
static int
dissect_ziop_tcp (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, void* data)
{
if ( tvb_memeql(tvb, 0, (const guint8 *)ZIOP_MAGIC, 4) != 0)
{
if (tvb_get_ntohl(tvb, 0) == GIOP_MAGIC_NUMBER)
{
dissect_giop(tvb, pinfo, tree);
return tvb_captured_length(tvb);
}
return 0;
}
tcp_dissect_pdus(tvb, pinfo, tree, ziop_desegment, ZIOP_HEADER_SIZE,
get_ziop_pdu_len, dissect_ziop, data);
return tvb_captured_length(tvb);
}
gboolean
dissect_ziop_heur (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, void * data)
{
guint tot_len;
conversation_t *conversation;
/* check magic number and version */
tot_len = tvb_captured_length(tvb);
if (tot_len < ZIOP_HEADER_SIZE) /* tot_len < 12 */
{
/* Not enough data captured to hold the ZIOP header; don't try
to interpret it as GIOP. */
return FALSE;
}
if ( tvb_memeql(tvb, 0, (const guint8 *)ZIOP_MAGIC, 4) != 0)
{
return FALSE;
}
if ( pinfo->ptype == PT_TCP )
{
/*
* Make the ZIOP dissector the dissector for this conversation.
*
* If this isn't the first time this packet has been processed,
* we've already done this work, so we don't need to do it
* again.
*/
if (!pinfo->fd->visited)
{
conversation = find_or_create_conversation(pinfo);
/* Set dissector */
conversation_set_dissector(conversation, ziop_tcp_handle);
}
dissect_ziop_tcp (tvb, pinfo, tree, data);
}
else
{
dissect_ziop (tvb, pinfo, tree, data);
}
return TRUE;
}
void
proto_register_ziop (void)
{
/* A header field is something you can search/filter on.
*
* We create a structure to register our fields. It consists of an
* array of hf_register_info structures, each of which are of the format
* {&(field id), {name, abbrev, type, display, strings, bitmask, blurb, HFILL}}.
*/
static hf_register_info hf[] = {
{ &hf_ziop_magic,
{ "Header magic", "ziop.magic", FT_STRING, BASE_NONE, NULL, 0x0,
"ZIOPHeader magic", HFILL }},
{ &hf_ziop_giop_version_major,
{ "Header major version", "ziop.giop_version_major", FT_UINT8, BASE_OCT, NULL, 0x0,
"ZIOPHeader giop_major_version", HFILL }},
{ &hf_ziop_giop_version_minor,
{ "Header minor version", "ziop.giop_version_minor", FT_UINT8, BASE_OCT, NULL, 0x0,
"ZIOPHeader giop_minor_version", HFILL }},
{ &hf_ziop_flags,
{ "Header flags", "ziop.flags", FT_UINT8, BASE_OCT, NULL, 0x0,
"ZIOPHeader flags", HFILL }},
{ &hf_ziop_message_type,
{ "Header type", "ziop.message_type", FT_UINT8, BASE_OCT, VALS(giop_message_types), 0x0,
"ZIOPHeader message_type", HFILL }},
{ &hf_ziop_message_size,
{ "Header size", "ziop.message_size", FT_UINT32, BASE_DEC, NULL, 0x0,
"ZIOPHeader message_size", HFILL }},
{ &hf_ziop_compressor_id,
{ "Header compressor id", "ziop.compressor_id", FT_UINT16, BASE_DEC, VALS(ziop_compressor_ids), 0x0,
"ZIOPHeader compressor_id", HFILL }},
{ &hf_ziop_original_length,
{ "Header original length", "ziop.original_length", FT_UINT32, BASE_DEC, NULL, 0x0,
"ZIOP original_length", HFILL }}
};
static gint *ett[] = {
&ett_ziop
};
static ei_register_info ei[] = {
{ &ei_ziop_version, { "ziop.version_not_supported", PI_PROTOCOL, PI_WARN, "Version not supported", EXPFILL }},
};
expert_module_t* expert_ziop;
proto_ziop = proto_register_protocol("Zipped Inter-ORB Protocol", "ZIOP", "ziop");
proto_register_field_array (proto_ziop, hf, array_length (hf));
proto_register_subtree_array (ett, array_length (ett));
expert_ziop = expert_register_protocol(proto_ziop);
expert_register_field_array(expert_ziop, ei, array_length(ei));
register_dissector("ziop", dissect_ziop, proto_ziop);
}
void
proto_reg_handoff_ziop (void)
{
ziop_tcp_handle = create_dissector_handle(dissect_ziop_tcp, proto_ziop);
dissector_add_for_decode_as_with_preference("udp.port", ziop_tcp_handle);
heur_dissector_add("tcp", dissect_ziop_heur, "ZIOP over TCP", "ziop_tcp", proto_ziop, HEURISTIC_ENABLE);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 2
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=2 tabstop=8 expandtab:
* :indentSize=2:tabSize=8:noTabs=true:
*/
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