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/* packet-dcerpc-ndr.c
* Routines for DCERPC NDR dissection
* Copyright 2001, Todd Sabin <tas@webspan.net>
*
* 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 "packet-dcerpc.h"
/*
* The NDR routines are for use by dcerpc subdissetors. They're
* primarily for making sure things are aligned properly according
* to the rules of NDR.
*/
int
dissect_ndr_uint8(tvbuff_t *tvb, gint offset, packet_info *pinfo,
proto_tree *tree, dcerpc_info *di, guint8 *drep,
int hfindex, guint8 *pdata)
{
/* Some callers expect us to initialize pdata, even in error conditions, so
* do it right away in case we forget later */
if (pdata)
*pdata = 0;
if (di->conformant_run) {
/* just a run to handle conformant arrays, no scalars to dissect */
return offset;
}
/* no alignment needed */
return dissect_dcerpc_uint8(tvb, offset, pinfo,
tree, drep, hfindex, pdata);
}
int
PIDL_dissect_uint8_val(tvbuff_t *tvb, gint offset, packet_info *pinfo,
proto_tree *tree, dcerpc_info *di, guint8 *drep,
int hfindex, guint32 param, guint8 *pval)
{
guint8 val;
if (di->conformant_run) {
/* just a run to handle conformant arrays, no scalars to dissect */
return offset;
}
/* no alignment needed */
offset = dissect_dcerpc_uint8(tvb, offset, pinfo,
tree, drep, hfindex, &val);
if (param&PIDL_SET_COL_INFO) {
header_field_info *hf_info;
char *valstr;
hf_info = proto_registrar_get_nth(hfindex);
valstr = (char *)wmem_alloc(pinfo->pool, 64);
valstr[0]=0;
switch (hf_info->display) {
case BASE_DEC:
if (hf_info->strings) {
snprintf(valstr, 64, "%s(%d)",val_to_str(val, (const value_string *)hf_info->strings, "Unknown:%u"), val);
} else {
snprintf(valstr, 64, "%d", val);
}
break;
case BASE_HEX:
if (hf_info->strings) {
snprintf(valstr, 64, "%s(0x%02x)",val_to_str(val, (const value_string *)hf_info->strings, "Unknown:%u"), val);
} else {
snprintf(valstr, 64, "0x%02x", val);
}
break;
default:
REPORT_DISSECTOR_BUG("Invalid hf->display value");
}
col_append_fstr(pinfo->cinfo, COL_INFO," %s:%s", hf_info->name, valstr);
}
if (pval) {
*pval = val;
}
return offset;
}
int
PIDL_dissect_uint8(tvbuff_t *tvb, gint offset, packet_info *pinfo,
proto_tree *tree, dcerpc_info *di, guint8 *drep,
int hfindex, guint32 param)
{
return PIDL_dissect_uint8_val(tvb, offset, pinfo, tree, di, drep, hfindex, param, NULL);
}
int
dissect_ndr_uint16(tvbuff_t *tvb, gint offset, packet_info *pinfo,
proto_tree *tree, dcerpc_info *di, guint8 *drep,
int hfindex, guint16 *pdata)
{
/* Some callers expect us to initialize pdata, even in error conditions, so
* do it right away in case we forget later */
if (pdata)
*pdata = 0;
if (di->conformant_run) {
/* just a run to handle conformant arrays, no scalars to dissect */
return offset;
}
if (!di->no_align && (offset % 2)) {
offset++;
}
return dissect_dcerpc_uint16(tvb, offset, pinfo,
tree, drep, hfindex, pdata);
}
int
PIDL_dissect_uint16_val(tvbuff_t *tvb, gint offset, packet_info *pinfo,
proto_tree *tree, dcerpc_info *di, guint8 *drep,
int hfindex, guint32 param, guint16 *pval)
{
guint16 val;
if (di->conformant_run) {
/* just a run to handle conformant arrays, no scalars to dissect */
return offset;
}
if (!di->no_align && (offset % 2)) {
offset++;
}
offset = dissect_dcerpc_uint16(tvb, offset, pinfo,
tree, drep, hfindex, &val);
if (param&PIDL_SET_COL_INFO) {
header_field_info *hf_info;
char *valstr;
hf_info = proto_registrar_get_nth(hfindex);
valstr = (char *)wmem_alloc(pinfo->pool, 64);
valstr[0]=0;
switch (hf_info->display) {
case BASE_DEC:
if (hf_info->strings) {
snprintf(valstr, 64, "%s(%d)",val_to_str(val, (const value_string *)hf_info->strings, "Unknown:%u"), val);
} else {
snprintf(valstr, 64, "%d", val);
}
break;
case BASE_HEX:
if (hf_info->strings) {
snprintf(valstr, 64, "%s(0x%04x)",val_to_str(val, (const value_string *)hf_info->strings, "Unknown:%u"), val);
} else {
snprintf(valstr, 64, "0x%04x", val);
}
break;
default:
REPORT_DISSECTOR_BUG("Invalid hf->display value");
}
col_append_fstr(pinfo->cinfo, COL_INFO," %s:%s", hf_info->name, valstr);
}
if (pval) {
*pval = val;
}
return offset;
}
int
PIDL_dissect_uint16(tvbuff_t *tvb, gint offset, packet_info *pinfo,
proto_tree *tree, dcerpc_info *di, guint8 *drep,
int hfindex, guint32 param)
{
return PIDL_dissect_uint16_val(tvb, offset, pinfo, tree, di, drep, hfindex, param, NULL);
}
int
dissect_ndr_uint32(tvbuff_t *tvb, gint offset, packet_info *pinfo,
proto_tree *tree, dcerpc_info *di, guint8 *drep,
int hfindex, guint32 *pdata)
{
/* Some callers expect us to initialize pdata, even in error conditions, so
* do it right away in case we forget later */
if (pdata)
*pdata = 0;
if ((di != NULL) && (di->conformant_run)) {
/* just a run to handle conformant arrays, no scalars to dissect */
return offset;
}
if ((di != NULL) && (!di->no_align) && (offset % 4)) {
offset += 4 - (offset % 4);
}
return dissect_dcerpc_uint32(tvb, offset, pinfo,
tree, drep, hfindex, pdata);
}
/* This is used to dissect the new datatypes, such as pointers and conformance
data, which is 4 bytes in size in NDR but 8 bytes in NDR64.
*/
int
dissect_ndr_uint3264(tvbuff_t *tvb, gint offset, packet_info *pinfo,
proto_tree *tree, dcerpc_info *di, guint8 *drep,
int hfindex, guint3264 *pdata)
{
if (di->call_data->flags & DCERPC_IS_NDR64) {
return dissect_ndr_uint64(tvb, offset, pinfo, tree, di, drep, hfindex, pdata);
} else {
guint32 val = 0;
offset = dissect_ndr_uint32(tvb, offset, pinfo, tree, di, drep, hfindex, &val);
if (pdata) {
*pdata = val;
}
return offset;
}
}
/* This is used to dissect the new datatypes, such as enums
that are 2 bytes in size in NDR but 4 bytes in NDR64.
*/
int
dissect_ndr_uint1632(tvbuff_t *tvb, gint offset, packet_info *pinfo,
proto_tree *tree, dcerpc_info *di, guint8 *drep,
int hfindex, guint1632 *pdata)
{
if (di->call_data->flags & DCERPC_IS_NDR64) {
return dissect_ndr_uint32(tvb, offset, pinfo, tree, di, drep, hfindex, pdata);
} else {
guint16 val = 0;
offset = dissect_ndr_uint16(tvb, offset, pinfo, tree, di, drep, hfindex, &val);
if (pdata) {
*pdata = val;
}
return offset;
}
}
int
PIDL_dissect_uint32_val(tvbuff_t *tvb, gint offset, packet_info *pinfo,
proto_tree *tree, dcerpc_info *di, guint8 *drep,
int hfindex, guint32 param, guint32 *rval)
{
guint32 val;
if (di->conformant_run) {
/* just a run to handle conformant arrays, no scalars to dissect */
return offset;
}
if (!di->no_align && (offset % 4)) {
offset += 4 - (offset % 4);
}
offset = dissect_dcerpc_uint32(tvb, offset, pinfo,
tree, drep, hfindex, &val);
if (param&PIDL_SET_COL_INFO) {
header_field_info *hf_info;
char *valstr;
hf_info = proto_registrar_get_nth(hfindex);
valstr = (char *)wmem_alloc(pinfo->pool, 64);
valstr[0]=0;
switch (hf_info->display) {
case BASE_DEC:
if (hf_info->strings) {
snprintf(valstr, 64, "%s(%d)",val_to_str(val, (const value_string *)hf_info->strings, "Unknown:%u"), val);
} else {
snprintf(valstr, 64, "%d", val);
}
break;
case BASE_HEX:
if (hf_info->strings) {
snprintf(valstr, 64, "%s(0x%08x)",val_to_str(val, (const value_string *)hf_info->strings, "Unknown:%u"), val);
} else {
snprintf(valstr, 64, "0x%08x", val);
}
break;
default:
REPORT_DISSECTOR_BUG("Invalid hf->display value");
}
col_append_fstr(pinfo->cinfo, COL_INFO," %s:%s", hf_info->name, valstr);
}
if (rval != NULL) {
*rval = val;
}
return offset;
}
int
PIDL_dissect_uint32(tvbuff_t *tvb, gint offset, packet_info *pinfo,
proto_tree *tree, dcerpc_info *di, guint8 *drep,
int hfindex, guint32 param)
{
return PIDL_dissect_uint32_val(tvb, offset, pinfo, tree, di, drep, hfindex, param, NULL);
}
/* Double uint32
This function dissects the 64bit datatype that is common for
ms interfaces and which is 32bit aligned.
It is really just 2 uint32's
*/
int
dissect_ndr_duint32(tvbuff_t *tvb, gint offset, packet_info *pinfo,
proto_tree *tree, dcerpc_info *di, guint8 *drep,
int hfindex, guint64 *pdata)
{
/* Some callers expect us to initialize pdata, even in error conditions, so
* do it right away in case we forget later */
if (pdata)
*pdata = 0;
if (di->conformant_run) {
/* just a run to handle conformant arrays, no scalars to dissect */
return offset;
}
if (!di->no_align && (offset % 4)) {
offset += 4 - (offset % 4);
}
return dissect_dcerpc_uint64(tvb, offset, pinfo,
tree, di, drep, hfindex, pdata);
}
/* uint64 : hyper
a 64 bit integer aligned to proper 8 byte boundaries
*/
int
dissect_ndr_uint64(tvbuff_t *tvb, gint offset, packet_info *pinfo,
proto_tree *tree, dcerpc_info *di, guint8 *drep,
int hfindex, guint64 *pdata)
{
/* Some callers expect us to initialize pdata, even in error conditions, so
* do it right away in case we forget later */
if (pdata)
*pdata = 0;
if (di->conformant_run) {
/* just a run to handle conformant arrays, no scalars to dissect */
return offset;
}
if (!di->no_align && (offset % 8)) {
gint padding = 8 - (offset % 8);
proto_tree_add_item(tree, hf_dcerpc_ndr_padding, tvb, offset, padding, ENC_NA);
offset += padding;
}
return dissect_dcerpc_uint64(tvb, offset, pinfo,
tree, di, drep, hfindex, pdata);
}
int
PIDL_dissect_uint64_val(tvbuff_t *tvb, gint offset, packet_info *pinfo,
proto_tree *tree, dcerpc_info *di, guint8 *drep,
int hfindex, guint32 param, guint64 *pval)
{
guint64 val;
if (di->conformant_run) {
/* just a run to handle conformant arrays, no scalars to dissect */
return offset;
}
if (!di->no_align && (offset % 8)) {
offset += 8 - (offset % 8);
}
offset = dissect_dcerpc_uint64(tvb, offset, pinfo,
tree, di, drep, hfindex, &val);
if (param&PIDL_SET_COL_INFO) {
header_field_info *hf_info;
char *valstr;
hf_info = proto_registrar_get_nth(hfindex);
valstr = (char *)wmem_alloc(pinfo->pool, 64);
valstr[0]=0;
switch (hf_info->display) {
case BASE_DEC:
if (hf_info->strings) {
snprintf(valstr, 64, "%s(%" PRIu64 ")",val_to_str( (guint32) val, (const value_string *)hf_info->strings, "Unknown:%u"), val);
} else {
snprintf(valstr, 64, "%" PRIu64, val);
}
break;
case BASE_HEX:
if (hf_info->strings) {
snprintf(valstr, 64, "%s(0x%" PRIx64 ")",val_to_str( (guint32) val, (const value_string *)hf_info->strings, "Unknown:%u"), val);
} else {
snprintf(valstr, 64, "0x%" PRIx64, val);
}
break;
default:
REPORT_DISSECTOR_BUG("Invalid hf->display value");
}
col_append_fstr(pinfo->cinfo, COL_INFO," %s:%s", hf_info->name, valstr);
}
if (pval) {
*pval = val;
}
return offset;
}
int
PIDL_dissect_uint64(tvbuff_t *tvb, gint offset, packet_info *pinfo,
proto_tree *tree, dcerpc_info *di, guint8 *drep,
int hfindex, guint32 param)
{
return PIDL_dissect_uint64_val(tvb, offset, pinfo, tree, di, drep, hfindex, param, NULL);
}
int
dissect_ndr_float(tvbuff_t *tvb, gint offset, packet_info *pinfo,
proto_tree *tree, dcerpc_info *di, guint8 *drep,
int hfindex, gfloat *pdata)
{
/* Some callers expect us to initialize pdata, even in error conditions, so
* do it right away in case we forget later */
if (pdata)
*pdata = 0;
if (di->conformant_run) {
/* just a run to handle conformant arrays, no scalars to dissect */
return offset;
}
if (!di->no_align && (offset % 4)) {
offset += 4 - (offset % 4);
}
return dissect_dcerpc_float(tvb, offset, pinfo,
tree, drep, hfindex, pdata);
}
int
dissect_ndr_double(tvbuff_t *tvb, gint offset, packet_info *pinfo,
proto_tree *tree, dcerpc_info *di, guint8 *drep,
int hfindex, gdouble *pdata)
{
/* Some callers expect us to initialize pdata, even in error conditions, so
* do it right away in case we forget later */
if (pdata)
*pdata = 0;
if (di->conformant_run) {
/* just a run to handle conformant arrays, no scalars to dissect */
return offset;
}
if (!di->no_align && (offset % 8)) {
offset += 8 - (offset % 8);
}
return dissect_dcerpc_double(tvb, offset, pinfo,
tree, drep, hfindex, pdata);
}
/* handles unix 32 bit time_t */
int
dissect_ndr_time_t(tvbuff_t *tvb, gint offset, packet_info *pinfo,
proto_tree *tree, dcerpc_info *di, guint8 *drep,
int hfindex, guint32 *pdata)
{
/* Some callers expect us to initialize pdata, even in error conditions, so
* do it right away in case we forget later */
if (pdata)
*pdata = 0;
if (di->conformant_run) {
/* just a run to handle conformant arrays, no scalars to dissect */
return offset;
}
if (!di->no_align && (offset % 4)) {
offset += 4 - (offset % 4);
}
return dissect_dcerpc_time_t(tvb, offset, pinfo,
tree, drep, hfindex, pdata);
}
int
dissect_ndr_uuid_t(tvbuff_t *tvb, gint offset, packet_info *pinfo,
proto_tree *tree, dcerpc_info *di, guint8 *drep,
int hfindex, e_guid_t *pdata)
{
/* Some callers expect us to initialize pdata, even in error conditions, so
* do it right away in case we forget later */
if (pdata)
memset(pdata, 0, sizeof(*pdata));
if (di->conformant_run) {
/* just a run to handle conformant arrays, no scalars to dissect */
return offset;
}
/* uuid's are aligned to 4 bytes, due to initial uint32 in struct */
if (!di->no_align && (offset % 4)) {
offset += 4 - (offset % 4);
}
return dissect_dcerpc_uuid_t(tvb, offset, pinfo,
tree, drep, hfindex, pdata);
}
/*
* XXX - at least according to the DCE RPC 1.1 "nbase.idl", an
* "ndr_context_handle" is an unsigned32 "context_handle_attributes"
* and a uuid_t "context_handle_uuid". The attributes do not appear to
* be used, and always appear to be set to 0, in the DCE RPC 1.1 code.
*
* Should we display an "ndr_context_handle" with a tree holding the
* attributes and the uuid_t?
*/
int
dissect_ndr_ctx_hnd(tvbuff_t *tvb, gint offset, packet_info *pinfo _U_,
proto_tree *tree, dcerpc_info *di, guint8 *drep,
int hfindex, e_ctx_hnd *pdata)
{
static e_ctx_hnd ctx_hnd;
if (di->conformant_run) {
/* just a run to handle conformant arrays, no scalars to dissect */
return offset;
}
if (!di->no_align && (offset % 4)) {
offset += 4 - (offset % 4);
}
ctx_hnd.attributes = dcerpc_tvb_get_ntohl(tvb, offset, drep);
dcerpc_tvb_get_uuid(tvb, offset+4, drep, &ctx_hnd.uuid);
if (tree) {
/* Bytes is bytes - don't worry about the data representation */
proto_tree_add_item(tree, hfindex, tvb, offset, 20, ENC_NA);
}
if (pdata) {
*pdata = ctx_hnd;
}
return offset + 20;
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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