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/* packet-omapi.c
* ISC OMAPI (Object Management API) dissector
* Copyright 2006, Jaap Keuter <jaap.keuter@xs4all.nl>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/*
* From the description api+protocol.
* All fields are 32 bit unless stated otherwise.
*
* On startup, each side sends a status message indicating what version
* of the protocol they are speaking. The status message looks like this:
* +---------+---------+
* | version | hlength |
* +---------+---------+
*
* The fixed-length header consists of:
* +--------+----+--------+----+-----+---------+------------+------------+-----+
* | authid | op | handle | id | rid | authlen | msg values | obj values | sig |
* +--------+----+--------+----+-----+---------+------v-----+-----v------+--v--+
* NOTE: real life capture shows order to be: authid, authlen, opcode, handle...
*
* The message and object values consists of:
* +---------+------+----------+-------+
* | namelen | name | valuelen | value |
* +---16b---+--v---+----------+---v---+
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/ptvcursor.h>
void proto_register_omapi(void);
void proto_reg_handoff_omapi(void);
static dissector_handle_t omapi_handle;
static int proto_omapi;
static int hf_omapi_version;
static int hf_omapi_hlength;
static int hf_omapi_auth_id;
static int hf_omapi_auth_len;
static int hf_omapi_opcode;
static int hf_omapi_handle;
static int hf_omapi_id;
static int hf_omapi_rid;
static int hf_omapi_msg_name_len; /* 16bit */
static int hf_omapi_msg_name;
static int hf_omapi_msg_value_len;
static int hf_omapi_msg_value;
static int hf_omapi_obj_name_len; /* 16bit */
static int hf_omapi_obj_name;
static int hf_omapi_obj_value_len;
static int hf_omapi_obj_value;
static int hf_omapi_signature;
/* Generated from convert_proto_tree_add_text.pl */
static int hf_omapi_empty_string;
static int hf_omapi_object_end_tag;
static int hf_omapi_message_end_tag;
static int hf_omapi_no_value;
static int ett_omapi;
#define OMAPI_PORT 7911 /* Not IANA registered */
#define OP_OPEN 1
#define OP_REFRESH 2
#define OP_UPDATE 3
#define OP_NOTIFY 4
#define OP_ERROR 5
#define OP_DELETE 6
#define OP_NOTIFY_CANCEL 7
#define OP_NOTIFY_CANCELLED 8
static const value_string omapi_opcode_vals[] = {
{ OP_OPEN, "Open" },
{ OP_REFRESH, "Refresh" },
{ OP_UPDATE, "Update" },
{ OP_NOTIFY, "Notify" },
{ OP_ERROR, "Error" },
{ OP_DELETE, "Delete" },
{ OP_NOTIFY_CANCEL, "Notify cancel" },
{ OP_NOTIFY_CANCELLED, "Notify cancelled" },
{ 0, NULL }
};
static int
dissect_omapi(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_item *ti;
proto_tree *omapi_tree;
ptvcursor_t *cursor;
uint32_t authlength;
uint32_t msglength;
uint32_t objlength;
/* Payload too small for OMAPI */
if (tvb_reported_length_remaining(tvb, 0) < 8)
return 0;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "OMAPI");
col_clear(pinfo->cinfo, COL_INFO);
ti = proto_tree_add_item(tree, proto_omapi, tvb, 0, -1, ENC_NA);
omapi_tree = proto_item_add_subtree(ti, ett_omapi);
cursor = ptvcursor_new(pinfo->pool, omapi_tree, tvb, 0);
if (tvb_reported_length_remaining(tvb, 0) < 24)
{
/* This is a startup message */
ptvcursor_add(cursor, hf_omapi_version, 4, ENC_BIG_ENDIAN);
ptvcursor_add(cursor, hf_omapi_hlength, 4, ENC_BIG_ENDIAN);
col_set_str(pinfo->cinfo, COL_INFO, "Status message");
proto_item_append_text(ti, ", Status message");
ptvcursor_free(cursor);
return 8;
}
else if ( !(tvb_get_ntohl(tvb, 8) || tvb_get_ntohl(tvb, 12)) )
{
/* This is a startup message, and more */
ptvcursor_add(cursor, hf_omapi_version, 4, ENC_BIG_ENDIAN);
ptvcursor_add(cursor, hf_omapi_hlength, 4, ENC_BIG_ENDIAN);
col_append_str(pinfo->cinfo, COL_INFO, "Status message");
proto_item_append_text(ti, ", Status message");
}
ptvcursor_add(cursor, hf_omapi_auth_id, 4, ENC_BIG_ENDIAN);
authlength = tvb_get_ntohl(tvb, ptvcursor_current_offset(cursor));
ptvcursor_add(cursor, hf_omapi_auth_len, 4, ENC_BIG_ENDIAN);
col_append_sep_str(pinfo->cinfo, COL_INFO, NULL,
val_to_str(tvb_get_ntohl(tvb, ptvcursor_current_offset(cursor)), omapi_opcode_vals, "Unknown opcode (0x%04x)"));
proto_item_append_text(ti, ", Opcode: %s",
val_to_str(tvb_get_ntohl(tvb, ptvcursor_current_offset(cursor)), omapi_opcode_vals, "Unknown opcode (0x%04x)"));
ptvcursor_add(cursor, hf_omapi_opcode, 4, ENC_BIG_ENDIAN);
ptvcursor_add(cursor, hf_omapi_handle, 4, ENC_BIG_ENDIAN);
ptvcursor_add(cursor, hf_omapi_id, 4, ENC_BIG_ENDIAN);
ptvcursor_add(cursor, hf_omapi_rid, 4, ENC_BIG_ENDIAN);
msglength = tvb_get_ntohs(tvb, ptvcursor_current_offset(cursor));
while (msglength)
{
ptvcursor_add(cursor, hf_omapi_msg_name_len, 2, ENC_BIG_ENDIAN);
ptvcursor_add(cursor, hf_omapi_msg_name, msglength, ENC_ASCII);
msglength = tvb_get_ntohl(tvb, ptvcursor_current_offset(cursor));
ptvcursor_add(cursor, hf_omapi_msg_value_len, 4, ENC_BIG_ENDIAN);
if (msglength == 0)
{
proto_tree_add_item(omapi_tree, hf_omapi_empty_string, tvb, 0, 0, ENC_NA);
}
else if (msglength == (uint32_t)~0)
{
proto_tree_add_item(omapi_tree, hf_omapi_no_value, tvb, 0, 0, ENC_NA);
}
else
{
ptvcursor_add(cursor, hf_omapi_msg_value, msglength, ENC_ASCII);
}
msglength = tvb_get_ntohs(tvb, ptvcursor_current_offset(cursor));
}
ptvcursor_add(cursor, hf_omapi_message_end_tag, 2, ENC_NA);
objlength = tvb_get_ntohs(tvb, ptvcursor_current_offset(cursor));
while (objlength)
{
ptvcursor_add(cursor, hf_omapi_obj_name_len, 2, ENC_BIG_ENDIAN);
ptvcursor_add(cursor, hf_omapi_obj_name, objlength, ENC_ASCII);
objlength = tvb_get_ntohl(tvb, ptvcursor_current_offset(cursor));
ptvcursor_add(cursor, hf_omapi_obj_value_len, 4, ENC_BIG_ENDIAN);
if (objlength == 0)
{
proto_tree_add_item(omapi_tree, hf_omapi_empty_string, tvb, 0, 0, ENC_NA);
}
else if (objlength == (uint32_t)~0)
{
proto_tree_add_item(omapi_tree, hf_omapi_no_value, tvb, 0, 0, ENC_NA);
}
else
{
ptvcursor_add(cursor, hf_omapi_obj_value, objlength, ENC_NA);
}
objlength = tvb_get_ntohs(tvb, ptvcursor_current_offset(cursor));
}
ptvcursor_add(cursor, hf_omapi_object_end_tag, 2, ENC_NA);
if (authlength > 0) {
ptvcursor_add(cursor, hf_omapi_signature, authlength, ENC_NA);
}
ptvcursor_free(cursor);
return tvb_captured_length(tvb);
}
void
proto_register_omapi(void)
{
static hf_register_info hf[] = {
{ &hf_omapi_version,
{ "Version", "omapi.version",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_omapi_hlength,
{ "Header length", "omapi.hlength",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_omapi_auth_id,
{ "Authentication ID", "omapi.authid",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_omapi_auth_len,
{ "Authentication length", "omapi.authlength",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_omapi_opcode,
{ "Opcode", "omapi.opcode",
FT_UINT32, BASE_DEC, VALS(omapi_opcode_vals), 0x0,
NULL, HFILL }},
{ &hf_omapi_handle,
{ "Handle", "omapi.handle",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_omapi_id,
{ "ID", "omapi.id",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_omapi_rid,
{ "Response ID", "omapi.rid",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_omapi_msg_name_len,
{ "Message name length", "omapi.msg_name_length",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_omapi_msg_name,
{ "Message name", "omapi.msg_name",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_omapi_msg_value_len,
{ "Message value length", "omapi.msg_value_length",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_omapi_msg_value,
{ "Message value", "omapi.msg_value",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_omapi_obj_name_len,
{ "Object name length", "omapi.obj_name_length",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_omapi_obj_name,
{ "Object name", "omapi.obj_name",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_omapi_obj_value_len,
{ "Object value length", "omapi.object_value_length",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_omapi_obj_value,
{ "Object value", "omapi.obj_value",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_omapi_signature,
{ "Signature", "omapi.signature",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
/* Generated from convert_proto_tree_add_text.pl */
{ &hf_omapi_empty_string, { "Empty string", "omapi.empty_string", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_omapi_no_value, { "No value", "omapi.no_value", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_omapi_message_end_tag, { "Message end tag", "omapi.message_end_tag", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_omapi_object_end_tag, { "Object end tag", "omapi.object_end_tag", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL }},
};
static int *ett[] = {
&ett_omapi
};
proto_omapi = proto_register_protocol("ISC Object Management API", "OMAPI", "omapi");
proto_register_field_array(proto_omapi, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
omapi_handle = register_dissector("omapi", dissect_omapi, proto_omapi);
}
void
proto_reg_handoff_omapi(void)
{
dissector_add_uint_with_preference("tcp.port", OMAPI_PORT, omapi_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local Variables:
* c-basic-offset: 2
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=2 tabstop=8 expandtab:
* :indentSize=2:tabSize=8:noTabs=true:
*/
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