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/*
Unix SMB/CIFS implementation.
SMB Extended attribute buffer handling
Copyright (C) Jeremy Allison 2005-2013
Copyright (C) Tim Prouty 2008
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "lib/util_ea.h"
/****************************************************************************
Read one EA list entry from the buffer.
****************************************************************************/
struct ea_list *read_ea_list_entry(TALLOC_CTX *ctx, const char *pdata, size_t data_size, size_t *pbytes_used)
{
struct ea_list *eal = talloc_zero(ctx, struct ea_list);
uint16 val_len;
unsigned int namelen;
size_t converted_size;
if (!eal) {
return NULL;
}
if (data_size < 6) {
return NULL;
}
eal->ea.flags = CVAL(pdata,0);
namelen = CVAL(pdata,1);
val_len = SVAL(pdata,2);
if (4 + namelen + 1 + val_len > data_size) {
return NULL;
}
/* Ensure the name is null terminated. */
if (pdata[namelen + 4] != '\0') {
return NULL;
}
if (!pull_ascii_talloc(ctx, &eal->ea.name, pdata + 4, &converted_size)) {
DEBUG(0,("read_ea_list_entry: pull_ascii_talloc failed: %s",
strerror(errno)));
}
if (!eal->ea.name) {
return NULL;
}
eal->ea.value = data_blob_talloc(eal, NULL, (size_t)val_len + 1);
if (!eal->ea.value.data) {
return NULL;
}
memcpy(eal->ea.value.data, pdata + 4 + namelen + 1, val_len);
/* Ensure we're null terminated just in case we print the value. */
eal->ea.value.data[val_len] = '\0';
/* But don't count the null. */
eal->ea.value.length--;
if (pbytes_used) {
*pbytes_used = 4 + namelen + 1 + val_len;
}
DEBUG(10,("read_ea_list_entry: read ea name %s\n", eal->ea.name));
dump_data(10, eal->ea.value.data, eal->ea.value.length);
return eal;
}
/****************************************************************************
Read a list of EA names and data from an incoming data buffer. Create an ea_list with them.
****************************************************************************/
struct ea_list *read_nttrans_ea_list(TALLOC_CTX *ctx, const char *pdata, size_t data_size)
{
struct ea_list *ea_list_head = NULL;
size_t offset = 0;
if (data_size < 4) {
return NULL;
}
while (offset + 4 <= data_size) {
size_t next_offset = IVAL(pdata,offset);
struct ea_list *eal = read_ea_list_entry(ctx, pdata + offset + 4, data_size - offset - 4, NULL);
if (!eal) {
return NULL;
}
DLIST_ADD_END(ea_list_head, eal, struct ea_list *);
if (next_offset == 0) {
break;
}
/* Integer wrap protection for the increment. */
if (offset + next_offset < offset) {
break;
}
offset += next_offset;
/* Integer wrap protection for while loop. */
if (offset + 4 < offset) {
break;
}
}
return ea_list_head;
}
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