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/* packet-rmcp.c
* Routines for RMCP packet dissection
*
* Duncan Laurie <duncan@sun.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* Copied from packet-tftp.c
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
void proto_register_rmcp(void);
void proto_register_rsp(void);
void proto_reg_handoff_rmcp(void);
void proto_reg_handoff_rsp(void);
static dissector_handle_t rmcp_handle;
static dissector_handle_t rsp_handle;
/*
* See
* http://www.dmtf.org/standards/standard_alert.php
* http://www.dmtf.org/standards/documents/ASF/DSP0136.pdf
* (the ASF specification includes RMCP)
*/
static int proto_rmcp;
static int hf_rmcp_version;
static int hf_rmcp_reserved;
static int hf_rmcp_sequence;
static int hf_rmcp_class;
static int hf_rmcp_type;
static int hf_rmcp_trailer;
static int proto_rsp;
static int hf_rsp_session_id;
static int hf_rsp_sequence;
static int ett_rmcp;
static int ett_rmcp_typeclass;
static int ett_rsp;
static dissector_table_t rmcp_dissector_table;
#define UDP_PORT_RMCP 623
#define UDP_PORT_RMCP_SECURE 664
#define RMCP_TYPE_MASK 0x80
#define RMCP_TYPE_NORM 0x00
#define RMCP_TYPE_ACK 0x01
static const value_string rmcp_type_vals[] = {
{ RMCP_TYPE_NORM, "Normal RMCP" },
{ RMCP_TYPE_ACK, "RMCP ACK" },
{ 0, NULL }
};
#define RMCP_CLASS_MASK 0x1f
#define RMCP_CLASS_ASF 0x06
#define RMCP_CLASS_IPMI 0x07
#define RMCP_CLASS_OEM 0x08
static const value_string rmcp_class_vals[] = {
{ RMCP_CLASS_ASF, "ASF" },
{ RMCP_CLASS_IPMI, "IPMI" },
{ RMCP_CLASS_OEM, "OEM" },
{ 0, NULL }
};
static int
dissect_rmcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
proto_tree *rmcp_tree = NULL, *field_tree;
proto_item *ti;
tvbuff_t *next_tvb;
uint8_t rmcp_class;
const char *class_str;
uint8_t type;
unsigned len;
/*
* Check whether it's a known class value; if not, assume it's
* not RMCP.
*/
if (!tvb_bytes_exist(tvb, 3, 1))
return 0; /* class value byte not present */
rmcp_class = tvb_get_uint8(tvb, 3);
/* Get the normal/ack bit from the RMCP class */
type = (rmcp_class & RMCP_TYPE_MASK) >> 7;
rmcp_class &= RMCP_CLASS_MASK;
class_str = try_val_to_str(rmcp_class, rmcp_class_vals);
if (class_str == NULL)
return 0; /* unknown class value */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "RMCP");
col_add_fstr(pinfo->cinfo, COL_INFO, "%s, Class: %s",
val_to_str(type, rmcp_type_vals, "Unknown (0x%02x)"),
class_str);
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_rmcp, tvb, 0, 4,
"Remote Management Control Protocol, Class: %s",
class_str);
rmcp_tree = proto_item_add_subtree(ti, ett_rmcp);
proto_tree_add_item(rmcp_tree, hf_rmcp_version, tvb, 0, 1, ENC_LITTLE_ENDIAN);
proto_tree_add_item(rmcp_tree, hf_rmcp_reserved, tvb, 1, 1, ENC_LITTLE_ENDIAN);
proto_tree_add_item(rmcp_tree, hf_rmcp_sequence, tvb, 2, 1, ENC_LITTLE_ENDIAN);
field_tree = proto_tree_add_subtree_format(rmcp_tree, tvb, 3, 1,
ett_rmcp_typeclass, NULL, "Type: %s, Class: %s",
val_to_str(type, rmcp_type_vals, "Unknown (0x%02x)"),
class_str);
proto_tree_add_item(field_tree, hf_rmcp_class, tvb, 3, 1, ENC_LITTLE_ENDIAN);
proto_tree_add_item(field_tree, hf_rmcp_type, tvb, 3, 1, ENC_LITTLE_ENDIAN);
}
if (!type){ /* do not expect a data block for an ACK */
next_tvb = tvb_new_subset_remaining(tvb, 4);
if (!dissector_try_uint(rmcp_dissector_table, rmcp_class, next_tvb, pinfo,
tree)) {
len = call_data_dissector(next_tvb, pinfo, tree);
if (len < tvb_reported_length(next_tvb)) {
proto_tree_add_item(tree, hf_rmcp_trailer, tvb, 4 + len, -1, ENC_NA);
}
}
}
return tvb_captured_length(tvb);
}
static int
dissect_rsp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
proto_tree *rsp_tree = NULL/*, *field_tree*/;
proto_item *ti/*, *tf*/;
tvbuff_t *next_tvb;
int offset = 0;
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_rsp, tvb, offset, 8,
"RMCP Security-extension Protocol");
rsp_tree = proto_item_add_subtree(ti, ett_rsp);
proto_tree_add_item(rsp_tree, hf_rsp_session_id, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(rsp_tree, hf_rsp_sequence, tvb, offset, 4, ENC_BIG_ENDIAN);
/*offset += 4;*/
}
/* XXX determination of RCMP message length needs to
* be done according to 3.2.3.3.3 of the specification.
* This is only valid for session ID equals 0
*/
next_tvb = tvb_new_subset_remaining(tvb, 8);
dissect_rmcp(next_tvb, pinfo, tree, NULL);
return tvb_captured_length(tvb);
}
void
proto_register_rmcp(void)
{
static hf_register_info hf[] = {
{ &hf_rmcp_version, {
"Version", "rmcp.version",
FT_UINT8, BASE_HEX, NULL, 0,
"RMCP Version", HFILL }},
{ &hf_rmcp_reserved, {
"Reserved", "rmcp.reserved",
FT_UINT8, BASE_HEX, NULL, 0,
"RMCP Reserved", HFILL }},
{ &hf_rmcp_sequence, {
"Sequence", "rmcp.sequence",
FT_UINT8, BASE_HEX, NULL, 0,
"RMCP Sequence", HFILL }},
{ &hf_rmcp_class, {
"Class", "rmcp.class",
FT_UINT8, BASE_HEX,
VALS(rmcp_class_vals), RMCP_CLASS_MASK,
"RMCP Class", HFILL }},
{ &hf_rmcp_type, {
"Message Type", "rmcp.type",
FT_UINT8, BASE_HEX,
VALS(rmcp_type_vals), RMCP_TYPE_MASK,
"RMCP Message Type", HFILL }},
{ &hf_rmcp_trailer, {
"RSP Trailer", "rmcp.trailer",
FT_BYTES, BASE_NONE, NULL, 0,
NULL, HFILL }},
};
static int *ett[] = {
&ett_rmcp,
&ett_rmcp_typeclass
};
proto_rmcp = proto_register_protocol("Remote Management Control Protocol", "RMCP", "rmcp");
proto_register_field_array(proto_rmcp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
rmcp_handle = register_dissector("rmcp", dissect_rmcp, proto_rmcp);
rmcp_dissector_table = register_dissector_table(
"rmcp.class", "RMCP Class", proto_rmcp, FT_UINT8, BASE_HEX);
}
void
proto_register_rsp(void)
{
static hf_register_info hf[] = {
{ &hf_rsp_session_id, {
"Session ID", "rsp.session_id",
FT_UINT32, BASE_HEX, NULL, 0,
"RSP session ID", HFILL }},
{ &hf_rsp_sequence, {
"Sequence", "rsp.sequence",
FT_UINT32, BASE_HEX, NULL, 0,
"RSP sequence", HFILL }},
};
static int *ett[] = {
&ett_rsp
};
proto_rsp = proto_register_protocol("RMCP Security-extensions Protocol", "RSP", "rsp");
proto_register_field_array(proto_rsp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
rsp_handle = register_dissector("rsp", dissect_rsp, proto_rsp);
}
void
proto_reg_handoff_rmcp(void)
{
dissector_add_uint_with_preference("udp.port", UDP_PORT_RMCP, rmcp_handle);
}
void
proto_reg_handoff_rsp(void)
{
dissector_add_uint_with_preference("udp.port", UDP_PORT_RMCP_SECURE, rsp_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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