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samba-mirror/source3/libndr/ndr_string.c

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/*
Unix SMB/CIFS implementation.
routines for marshalling/unmarshalling string 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"
/**
pull a general string from the wire
*/
NTSTATUS ndr_pull_string(struct ndr_pull *ndr, int ndr_flags, const char **s)
{
char *as=NULL;
uint32_t len1, ofs, len2;
uint16_t len3;
int ret;
charset_t chset = CH_UCS2;
unsigned byte_mul = 2;
unsigned flags = ndr->flags;
unsigned c_len_term = 0;
if (!(ndr_flags & NDR_SCALARS)) {
return NT_STATUS_OK;
}
SMB_ASSERT(!NDR_BE(ndr));
if (flags & LIBNDR_FLAG_STR_ASCII) {
chset = CH_DOS;
byte_mul = 1;
flags &= ~LIBNDR_FLAG_STR_ASCII;
}
if (flags & LIBNDR_FLAG_STR_UTF8) {
chset = CH_UTF8;
byte_mul = 1;
flags &= ~LIBNDR_FLAG_STR_UTF8;
}
flags &= ~LIBNDR_FLAG_STR_CONFORMANT;
if (flags & LIBNDR_FLAG_STR_CHARLEN) {
c_len_term = 1;
flags &= ~LIBNDR_FLAG_STR_CHARLEN;
}
switch (flags & LIBNDR_STRING_FLAGS) {
case LIBNDR_FLAG_STR_LEN4|LIBNDR_FLAG_STR_SIZE4:
case LIBNDR_FLAG_STR_LEN4|LIBNDR_FLAG_STR_SIZE4|LIBNDR_FLAG_STR_NOTERM:
NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &len1));
NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &ofs));
if (ofs != 0) {
return ndr_pull_error(ndr, NDR_ERR_STRING, "non-zero array offset with string flags 0x%x\n",
ndr->flags & LIBNDR_STRING_FLAGS);
}
NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &len2));
if (len2 > len1) {
return ndr_pull_error(ndr, NDR_ERR_STRING,
"Bad string lengths len1=%u ofs=%u len2=%u\n",
len1, ofs, len2);
}
NDR_PULL_NEED_BYTES(ndr, (len2 + c_len_term)*byte_mul);
if (len2 == 0) {
as = talloc_strdup(ndr->current_mem_ctx, "");
} else {
ret = convert_string_talloc(ndr->current_mem_ctx,
chset, CH_UNIX,
ndr->data+ndr->offset,
(len2 + c_len_term)*byte_mul,
&as, True);
if (ret == -1) {
return ndr_pull_error(ndr, NDR_ERR_CHARCNV,
"Bad character conversion");
}
}
NDR_CHECK(ndr_pull_advance(ndr, (len2 + c_len_term)*byte_mul));
if (len1 != len2) {
DEBUG(6,("len1[%u] != len2[%u] '%s'\n", len1, len2, as));
}
/* this is a way of detecting if a string is sent with the wrong
termination */
if (ndr->flags & LIBNDR_FLAG_STR_NOTERM) {
if (strlen(as) < (len2 + c_len_term)) {
DEBUG(6,("short string '%s'\n", as));
}
} else {
if (strlen(as) == (len2 + c_len_term)) {
DEBUG(6,("long string '%s'\n", as));
}
}
*s = as;
break;
case LIBNDR_FLAG_STR_SIZE4:
case LIBNDR_FLAG_STR_SIZE4|LIBNDR_FLAG_STR_NOTERM:
NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &len1));
NDR_PULL_NEED_BYTES(ndr, (len1 + c_len_term)*byte_mul);
if (len1 == 0) {
as = talloc_strdup(ndr->current_mem_ctx, "");
} else {
ret = convert_string_talloc(ndr->current_mem_ctx,
chset, CH_UNIX,
ndr->data+ndr->offset,
(len1 + c_len_term)*byte_mul,
&as, False);
if (ret == -1) {
return ndr_pull_error(ndr, NDR_ERR_CHARCNV,
"Bad character conversion");
}
}
NDR_CHECK(ndr_pull_advance(ndr, (len1 + c_len_term)*byte_mul));
/* this is a way of detecting if a string is sent with the wrong
termination */
if (ndr->flags & LIBNDR_FLAG_STR_NOTERM) {
if (strlen(as) < (len1 + c_len_term)) {
DEBUG(6,("short string '%s'\n", as));
}
} else {
if (strlen(as) == (len1 + c_len_term)) {
DEBUG(6,("long string '%s'\n", as));
}
}
*s = as;
break;
case LIBNDR_FLAG_STR_LEN4:
case LIBNDR_FLAG_STR_LEN4|LIBNDR_FLAG_STR_NOTERM:
NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &ofs));
if (ofs != 0) {
return ndr_pull_error(ndr, NDR_ERR_STRING, "non-zero array offset with string flags 0x%x\n",
ndr->flags & LIBNDR_STRING_FLAGS);
}
NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &len1));
NDR_PULL_NEED_BYTES(ndr, (len1 + c_len_term)*byte_mul);
if (len1 == 0) {
as = talloc_strdup(ndr->current_mem_ctx, "");
} else {
ret = convert_string_talloc(ndr->current_mem_ctx,
chset, CH_UNIX,
ndr->data+ndr->offset,
(len1 + c_len_term)*byte_mul,
&as, False);
if (ret == -1) {
return ndr_pull_error(ndr, NDR_ERR_CHARCNV,
"Bad character conversion");
}
}
NDR_CHECK(ndr_pull_advance(ndr, (len1 + c_len_term)*byte_mul));
/* this is a way of detecting if a string is sent with the wrong
termination */
if (ndr->flags & LIBNDR_FLAG_STR_NOTERM) {
if (strlen(as) < (len1 + c_len_term)) {
DEBUG(6,("short string '%s'\n", as));
}
} else {
if (strlen(as) == (len1 + c_len_term)) {
DEBUG(6,("long string '%s'\n", as));
}
}
*s = as;
break;
case LIBNDR_FLAG_STR_SIZE2:
case LIBNDR_FLAG_STR_SIZE2|LIBNDR_FLAG_STR_NOTERM:
NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &len3));
NDR_PULL_NEED_BYTES(ndr, (len3 + c_len_term)*byte_mul);
if (len3 == 0) {
as = talloc_strdup(ndr->current_mem_ctx, "");
} else {
ret = convert_string_talloc(ndr->current_mem_ctx,
chset, CH_UNIX,
ndr->data+ndr->offset,
(len3 + c_len_term)*byte_mul,
&as, False);
if (ret == -1) {
return ndr_pull_error(ndr, NDR_ERR_CHARCNV,
"Bad character conversion");
}
}
NDR_CHECK(ndr_pull_advance(ndr, (len3 + c_len_term)*byte_mul));
/* this is a way of detecting if a string is sent with the wrong
termination */
if (ndr->flags & LIBNDR_FLAG_STR_NOTERM) {
if (strlen(as) < (len3 + c_len_term)) {
DEBUG(6,("short string '%s'\n", as));
}
} else {
if (strlen(as) == (len3 + c_len_term)) {
DEBUG(6,("long string '%s'\n", as));
}
}
*s = as;
break;
case LIBNDR_FLAG_STR_SIZE2|LIBNDR_FLAG_STR_NOTERM|LIBNDR_FLAG_STR_BYTESIZE:
NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &len3));
NDR_PULL_NEED_BYTES(ndr, len3);
if (len3 == 0) {
as = talloc_strdup(ndr->current_mem_ctx, "");
} else {
ret = convert_string_talloc(ndr->current_mem_ctx,
chset, CH_UNIX,
ndr->data+ndr->offset,
len3, &as, False);
if (ret == -1) {
return ndr_pull_error(ndr, NDR_ERR_CHARCNV,
"Bad character conversion");
}
}
NDR_CHECK(ndr_pull_advance(ndr, len3));
*s = as;
break;
case LIBNDR_FLAG_STR_NULLTERM:
if (byte_mul == 1) {
len1 = ascii_len_n((const char *)(ndr->data+ndr->offset), ndr->data_size - ndr->offset);
} else {
len1 = utf16_len_n(ndr->data+ndr->offset, ndr->data_size - ndr->offset);
}
ret = convert_string_talloc(ndr->current_mem_ctx,
chset, CH_UNIX,
ndr->data+ndr->offset,
len1, &as, False);
if (ret == -1) {
return ndr_pull_error(ndr, NDR_ERR_CHARCNV,
"Bad character conversion");
}
NDR_CHECK(ndr_pull_advance(ndr, len1));
*s = as;
break;
case LIBNDR_FLAG_STR_FIXLEN15:
case LIBNDR_FLAG_STR_FIXLEN32:
len1 = (flags & LIBNDR_FLAG_STR_FIXLEN32)?32:15;
NDR_PULL_NEED_BYTES(ndr, len1*byte_mul);
ret = convert_string_talloc(ndr->current_mem_ctx,
chset, CH_UNIX,
ndr->data+ndr->offset,
len1*byte_mul, &as, False);
if (ret == -1) {
return ndr_pull_error(ndr, NDR_ERR_CHARCNV,
"Bad character conversion");
}
NDR_CHECK(ndr_pull_advance(ndr, len1*byte_mul));
*s = as;
break;
default:
return ndr_pull_error(ndr, NDR_ERR_STRING, "Bad string flags 0x%x\n",
ndr->flags & LIBNDR_STRING_FLAGS);
}
return NT_STATUS_OK;
}
/**
push a general string onto the wire
*/
NTSTATUS ndr_push_string(struct ndr_push *ndr, int ndr_flags, const char *s)
{
ssize_t s_len, c_len, d_len;
charset_t chset = CH_UCS2;
unsigned flags = ndr->flags;
unsigned byte_mul = 2;
uint8_t *dest = NULL;
if (!(ndr_flags & NDR_SCALARS)) {
return NT_STATUS_OK;
}
SMB_ASSERT(!NDR_BE(ndr));
s_len = s?strlen(s):0;
if (flags & LIBNDR_FLAG_STR_ASCII) {
chset = CH_DOS;
byte_mul = 1;
flags &= ~LIBNDR_FLAG_STR_ASCII;
}
if (flags & LIBNDR_FLAG_STR_UTF8) {
chset = CH_UTF8;
byte_mul = 1;
flags &= ~LIBNDR_FLAG_STR_UTF8;
}
flags &= ~LIBNDR_FLAG_STR_CONFORMANT;
if (!(flags &
(LIBNDR_FLAG_STR_NOTERM |
LIBNDR_FLAG_STR_FIXLEN15 |
LIBNDR_FLAG_STR_FIXLEN32))) {
s_len++;
}
d_len = convert_string_talloc(ndr, CH_UNIX, chset, s, s_len, &dest,
False);
if (d_len == -1) {
return ndr_push_error(ndr, NDR_ERR_CHARCNV,
"Bad character conversion");
}
if (flags & LIBNDR_FLAG_STR_BYTESIZE) {
c_len = d_len;
flags &= ~LIBNDR_FLAG_STR_BYTESIZE;
} else if (flags & LIBNDR_FLAG_STR_CHARLEN) {
c_len = (d_len / byte_mul)-1;
flags &= ~LIBNDR_FLAG_STR_CHARLEN;
} else {
c_len = d_len / byte_mul;
}
switch ((flags & LIBNDR_STRING_FLAGS) & ~LIBNDR_FLAG_STR_NOTERM) {
case LIBNDR_FLAG_STR_LEN4|LIBNDR_FLAG_STR_SIZE4:
NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, c_len));
NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0));
NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, c_len));
NDR_CHECK(ndr_push_bytes(ndr, dest, d_len));
break;
case LIBNDR_FLAG_STR_LEN4:
NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0));
NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, c_len));
NDR_CHECK(ndr_push_bytes(ndr, dest, d_len));
break;
case LIBNDR_FLAG_STR_SIZE4:
NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, c_len));
NDR_CHECK(ndr_push_bytes(ndr, dest, d_len));
break;
case LIBNDR_FLAG_STR_SIZE2:
NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, c_len));
NDR_CHECK(ndr_push_bytes(ndr, dest, d_len));
break;
case LIBNDR_FLAG_STR_NULLTERM:
NDR_CHECK(ndr_push_bytes(ndr, dest, d_len));
break;
case LIBNDR_FLAG_STR_FIXLEN15:
case LIBNDR_FLAG_STR_FIXLEN32: {
ssize_t fix_len = (flags & LIBNDR_FLAG_STR_FIXLEN32)?32:15;
uint32_t pad_len = fix_len - d_len;
if (d_len > fix_len) {
return ndr_push_error(ndr, NDR_ERR_CHARCNV,
"Bad character conversion");
}
NDR_CHECK(ndr_push_bytes(ndr, dest, d_len));
if (pad_len != 0) {
NDR_CHECK(ndr_push_zero(ndr, pad_len));
}
break;
}
default:
return ndr_push_error(ndr, NDR_ERR_STRING, "Bad string flags 0x%x\n",
ndr->flags & LIBNDR_STRING_FLAGS);
}
talloc_free(dest);
return NT_STATUS_OK;
}
/**
push a general string onto the wire
*/
size_t ndr_string_array_size(struct ndr_push *ndr, const char *s)
{
size_t c_len;
unsigned flags = ndr->flags;
unsigned byte_mul = 2;
unsigned c_len_term = 1;
if (flags & LIBNDR_FLAG_STR_FIXLEN32) {
return 32;
}
if (flags & LIBNDR_FLAG_STR_FIXLEN15) {
return 15;
}
c_len = s?strlen(s):0;
if (flags & (LIBNDR_FLAG_STR_ASCII|LIBNDR_FLAG_STR_UTF8)) {
byte_mul = 1;
}
if (flags & LIBNDR_FLAG_STR_NOTERM) {
c_len_term = 0;
}
c_len = c_len + c_len_term;
if (flags & LIBNDR_FLAG_STR_BYTESIZE) {
c_len = c_len * byte_mul;
}
return c_len;
}
void ndr_print_string(struct ndr_print *ndr, const char *name, const char *s)
{
if (s) {
ndr->print(ndr, "%-25s: '%s'", name, s);
} else {
ndr->print(ndr, "%-25s: NULL", name);
}
}
uint32_t ndr_size_string(int ret, const char * const* string, int flags)
{
/* FIXME: Is this correct for all strings ? */
if(!(*string)) return ret;
return ret+strlen(*string)+1;
}
/**
pull a general string array from the wire
*/
NTSTATUS ndr_pull_string_array(struct ndr_pull *ndr, int ndr_flags, const char ***_a)
{
const char **a = *_a;
uint32_t count;
if (!(ndr_flags & NDR_SCALARS)) {
return NT_STATUS_OK;
}
for (count = 0;; count++) {
TALLOC_CTX *tmp_ctx;
const char *s = NULL;
a = talloc_realloc(ndr->current_mem_ctx, a, const char *, count + 2);
NT_STATUS_HAVE_NO_MEMORY(a);
a[count] = NULL;
a[count+1] = NULL;
tmp_ctx = ndr->current_mem_ctx;
ndr->current_mem_ctx = a;
NDR_CHECK(ndr_pull_string(ndr, ndr_flags, &s));
ndr->current_mem_ctx = tmp_ctx;
if (strcmp("", s)==0) {
a[count] = NULL;
break;
} else {
a[count] = s;
}
}
*_a =a;
return NT_STATUS_OK;
}
/**
push a general string array onto the wire
*/
NTSTATUS ndr_push_string_array(struct ndr_push *ndr, int ndr_flags, const char **a)
{
uint32_t count;
if (!(ndr_flags & NDR_SCALARS)) {
return NT_STATUS_OK;
}
for (count = 0; a && a[count]; count++) {
NDR_CHECK(ndr_push_string(ndr, ndr_flags, a[count]));
}
NDR_CHECK(ndr_push_string(ndr, ndr_flags, ""));
return NT_STATUS_OK;
}
void ndr_print_string_array(struct ndr_print *ndr, const char *name, const char **a)
{
uint32_t count;
uint32_t i;
for (count = 0; a && a[count]; count++) {}
ndr->print(ndr, "%s: ARRAY(%d)", name, count);
ndr->depth++;
for (i=0;i<count;i++) {
char *idx=NULL;
asprintf(&idx, "[%d]", i);
if (idx) {
ndr_print_string(ndr, idx, a[i]);
free(idx);
}
}
ndr->depth--;
}
/**
* Return number of elements in a string including the last (zeroed) element
*/
uint32_t ndr_string_length(const void *_var, uint32_t element_size)
{
uint32_t i;
uint8_t zero[4] = {0,0,0,0};
const char *var = (const char *)_var;
for (i = 0; memcmp(var+i*element_size,zero,element_size) != 0; i++);
return i+1;
}
NTSTATUS ndr_check_string_terminator(struct ndr_pull *ndr, uint32_t count, uint32_t element_size)
{
uint32_t i;
struct ndr_pull_save save_offset;
ndr_pull_save(ndr, &save_offset);
ndr_pull_advance(ndr, (count - 1) * element_size);
NDR_PULL_NEED_BYTES(ndr, element_size);
for (i = 0; i < element_size; i++) {
if (ndr->data[ndr->offset+i] != 0) {
ndr_pull_restore(ndr, &save_offset);
return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE, "String terminator not present or outside string boundaries");
}
}
ndr_pull_restore(ndr, &save_offset);
return NT_STATUS_OK;
}
NTSTATUS ndr_pull_charset(struct ndr_pull *ndr, int ndr_flags, const char **var, uint32_t length, uint8_t byte_mul, int chset)
{
int ret;
if (length == 0) {
*var = talloc_strdup(ndr->current_mem_ctx, "");
return NT_STATUS_OK;
}
SMB_ASSERT (!NDR_BE(ndr) || chset != CH_UCS2);
NDR_PULL_NEED_BYTES(ndr, length*byte_mul);
ret = convert_string_talloc(ndr->current_mem_ctx,
chset, CH_UNIX,
ndr->data+ndr->offset,
length*byte_mul,
var, False);
if (ret == -1) {
return ndr_pull_error(ndr, NDR_ERR_CHARCNV,
"Bad character conversion");
}
NDR_CHECK(ndr_pull_advance(ndr, length*byte_mul));
return NT_STATUS_OK;
}
NTSTATUS ndr_push_charset(struct ndr_push *ndr, int ndr_flags, const char *var,
uint32_t length, uint8_t byte_mul, charset_t chset)
{
ssize_t ret, required;
SMB_ASSERT(!NDR_BE(ndr) || chset != CH_UCS2);
required = byte_mul * length;
NDR_PUSH_NEED_BYTES(ndr, required);
ret = convert_string(CH_UNIX, chset,
var, strlen(var),
ndr->data+ndr->offset, required, False);
if (ret == -1) {
return ndr_push_error(ndr, NDR_ERR_CHARCNV,
"Bad character conversion");
}
/* Make sure the remaining part of the string is filled with zeroes */
if (ret < required) {
memset(ndr->data+ndr->offset+ret, 0, required-ret);
}
ndr->offset += required;
return NT_STATUS_OK;
}
/* Return number of elements in a string in the specified charset */
uint32_t ndr_charset_length(const void *var, int chset)
{
/* FIXME: Treat special chars special here, taking chset into account */
/* Also include 0 byte */
return strlen((const char *)var)+1;
}