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/*
Unix SMB/CIFS implementation.
routines for marshalling/unmarshalling basic types
Copyright (C) Andrew Tridgell 2003
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#define NDR_PULL_NEED_BYTES(ndr, n) do { \
if ((n) > ndr->data_size || ndr->offset + (n) > ndr->data_size) { \
return NT_STATUS_BUFFER_TOO_SMALL; \
} \
} while(0)
#define NDR_PULL_ALIGN(ndr, n) do { \
ndr->offset = (ndr->offset + (n-1)) & ~(n-1); \
if (ndr->offset >= ndr->data_size) { \
return NT_STATUS_BUFFER_TOO_SMALL; \
} \
} while(0)
/*
parse a uint8
*/
NTSTATUS ndr_pull_uint8(struct ndr_pull *ndr, uint8 *v)
{
NDR_PULL_NEED_BYTES(ndr, 1);
*v = CVAL(ndr->data, ndr->offset);
ndr->offset += 1;
return NT_STATUS_OK;
}
/*
parse a uint16
*/
NTSTATUS ndr_pull_uint16(struct ndr_pull *ndr, uint16 *v)
{
NDR_PULL_ALIGN(ndr, 2);
NDR_PULL_NEED_BYTES(ndr, 2);
if (ndr->flags & LIBNDR_FLAG_BIGENDIAN) {
*v = RSVAL(ndr->data, ndr->offset);
} else {
*v = SVAL(ndr->data, ndr->offset);
}
ndr->offset += 2;
return NT_STATUS_OK;
}
/*
parse a uint32
*/
NTSTATUS ndr_pull_uint32(struct ndr_pull *ndr, uint32 *v)
{
NDR_PULL_ALIGN(ndr, 4);
NDR_PULL_NEED_BYTES(ndr, 4);
if (ndr->flags & LIBNDR_FLAG_BIGENDIAN) {
*v = RIVAL(ndr->data, ndr->offset);
} else {
*v = IVAL(ndr->data, ndr->offset);
}
ndr->offset += 4;
return NT_STATUS_OK;
}
/*
pull a NTSTATUS
*/
NTSTATUS ndr_pull_NTSTATUS(struct ndr_pull *ndr, NTSTATUS *status)
{
uint32 v;
NDR_CHECK(ndr_pull_uint32(ndr, &v));
*status = NT_STATUS(v);
return NT_STATUS_OK;
}
/*
parse a set of bytes
*/
NTSTATUS ndr_pull_bytes(struct ndr_pull *ndr, char *data, uint32 n)
{
NDR_PULL_NEED_BYTES(ndr, n);
memcpy(data, ndr->data + ndr->offset, n);
ndr->offset += n;
return NT_STATUS_OK;
}
/*
parse a GUID
*/
NTSTATUS ndr_pull_guid(struct ndr_pull *ndr, GUID *guid)
{
int i;
NDR_PULL_NEED_BYTES(ndr, GUID_SIZE);
for (i=0;i<GUID_SIZE;i++) {
guid->info[i] = CVAL(ndr->data, ndr->offset + i);
}
ndr->offset += i;
return NT_STATUS_OK;
}
#define NDR_PUSH_NEED_BYTES(ndr, n) NDR_CHECK(ndr_push_expand(ndr, ndr->offset+(n)))
#define NDR_PUSH_ALIGN(ndr, n) do { \
uint32 _pad = (ndr->offset & (n-1)); \
while (_pad--) NDR_CHECK(ndr_push_uint8(ndr, 0)); \
} while(0)
/*
push a uint8
*/
NTSTATUS ndr_push_uint8(struct ndr_push *ndr, uint8 v)
{
NDR_PUSH_NEED_BYTES(ndr, 1);
SCVAL(ndr->data, ndr->offset, v);
ndr->offset += 1;
return NT_STATUS_OK;
}
/*
push a uint16
*/
NTSTATUS ndr_push_uint16(struct ndr_push *ndr, uint16 v)
{
NDR_PUSH_ALIGN(ndr, 2);
NDR_PUSH_NEED_BYTES(ndr, 2);
SSVAL(ndr->data, ndr->offset, v);
ndr->offset += 2;
return NT_STATUS_OK;
}
/*
push a uint32
*/
NTSTATUS ndr_push_uint32(struct ndr_push *ndr, uint32 v)
{
NDR_PUSH_ALIGN(ndr, 4);
NDR_PUSH_NEED_BYTES(ndr, 4);
SIVAL(ndr->data, ndr->offset, v);
ndr->offset += 4;
return NT_STATUS_OK;
}
/*
align to a uint32
*/
NTSTATUS ndr_push_align_uint32(struct ndr_push *ndr)
{
NDR_PUSH_ALIGN(ndr, 4);
return NT_STATUS_OK;
}
/*
push some bytes
*/
NTSTATUS ndr_push_bytes(struct ndr_push *ndr, const char *data, uint32 n)
{
NDR_PUSH_NEED_BYTES(ndr, n);
memcpy(ndr->data + ndr->offset, data, n);
ndr->offset += n;
return NT_STATUS_OK;
}
/*
save the current position
*/
void ndr_push_save(struct ndr_push *ndr, struct ndr_push_save *save)
{
save->offset = ndr->offset;
}
/*
restore the position
*/
void ndr_push_restore(struct ndr_push *ndr, struct ndr_push_save *save)
{
ndr->offset = save->offset;
}
/*
this is used when a packet has a 4 byte length field. We remember the start position
and come back to it later to fill in the size
*/
NTSTATUS ndr_push_length4_start(struct ndr_push *ndr, struct ndr_push_save *save)
{
NDR_PUSH_ALIGN(ndr, 4);
ndr_push_save(ndr, save);
return ndr_push_uint32(ndr, 0);
}
NTSTATUS ndr_push_length4_end(struct ndr_push *ndr, struct ndr_push_save *save)
{
struct ndr_push_save save2;
ndr_push_save(ndr, &save2);
ndr_push_restore(ndr, save);
NDR_CHECK(ndr_push_uint32(ndr, save2.offset - ndr->offset));
ndr_push_restore(ndr, &save2);
return NT_STATUS_OK;
}
/*
push a 1 if a pointer is non-NULL, otherwise 0
*/
NTSTATUS ndr_push_ptr(struct ndr_push *ndr, const void *p)
{
return ndr_push_uint32(ndr, p?1:0);
}
/*
push a comformant, variable ucs2 string onto the wire from a C string
*/
NTSTATUS ndr_push_unistr(struct ndr_push *ndr, const char *s)
{
char *ws;
ssize_t len;
len = push_ucs2_talloc(ndr->mem_ctx, (smb_ucs2_t **)&ws, s);
if (len == -1) {
return NT_STATUS_INVALID_PARAMETER;
}
NDR_CHECK(ndr_push_uint32(ndr, len/2));
NDR_CHECK(ndr_push_uint32(ndr, 0));
NDR_CHECK(ndr_push_uint32(ndr, len/2));
NDR_CHECK(ndr_push_bytes(ndr, ws, len));
return NT_STATUS_OK;
}
/*
pull a comformant, variable ucs2 string from the wire into a C string
*/
NTSTATUS ndr_pull_unistr(struct ndr_pull *ndr, const char **s)
{
char *ws, *as=NULL;
uint32 len1, ofs, len2;
NDR_CHECK(ndr_pull_uint32(ndr, &len1));
NDR_CHECK(ndr_pull_uint32(ndr, &ofs));
NDR_CHECK(ndr_pull_uint32(ndr, &len2));
if (len2 > len1) {
return NT_STATUS_INVALID_PARAMETER;
}
NDR_ALLOC_N(ndr, ws, (len1+1)*2);
NDR_CHECK(ndr_pull_bytes(ndr, ws, len1*2));
SSVAL(ws, len1*2, 0);
SSVAL(ws, len2*2, 0);
pull_ucs2_talloc(ndr->mem_ctx, &as, (const smb_ucs2_t *)ws);
if (!as) {
return NT_STATUS_INVALID_PARAMETER;
}
*s = as;
return NT_STATUS_OK;
}
/*
push a 4 byte offset pointer, remembering where we are so we can later fill
in the correct value
*/
NTSTATUS ndr_push_offset(struct ndr_push *ndr, struct ndr_push_save *ofs)
{
NDR_PUSH_ALIGN(ndr, 4);
ndr_push_save(ndr, ofs);
return ndr_push_uint32(ndr, 0);
}
/*
fill in the correct offset in a saved offset pointer
the offset is taken relative to 'save'
*/
NTSTATUS ndr_push_offset_ptr(struct ndr_push *ndr,
struct ndr_push_save *ofs,
struct ndr_push_save *save)
{
struct ndr_push_save save2;
ndr_push_save(ndr, &save2);
ndr_push_restore(ndr, ofs);
NDR_CHECK(ndr_push_uint32(ndr, save2.offset - save->offset));
ndr_push_restore(ndr, &save2);
return NT_STATUS_OK;
}
/*
push a GUID
*/
NTSTATUS ndr_push_guid(struct ndr_push *ndr, GUID *guid)
{
return ndr_push_bytes(ndr, guid->info, GUID_SIZE);
}
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