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/*
Unix SMB/CIFS implementation.
tdb utility functions
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Rafal Szczesniak 2002
Copyright (C) Michael Adam 2007
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 "system/filesys.h"
#include "util_tdb.h"
#undef malloc
#undef realloc
#undef calloc
#undef strdup
/* these are little tdb utility functions that are meant to make
dealing with a tdb database a little less cumbersome in Samba */
static SIG_ATOMIC_T gotalarm;
/***************************************************************
Signal function to tell us we timed out.
****************************************************************/
static void gotalarm_sig(int signum)
{
gotalarm = 1;
}
/****************************************************************************
Lock a chain with timeout (in seconds).
****************************************************************************/
static int tdb_chainlock_with_timeout_internal( TDB_CONTEXT *tdb, TDB_DATA key, unsigned int timeout, int rw_type)
{
/* Allow tdb_chainlock to be interrupted by an alarm. */
int ret;
gotalarm = 0;
if (timeout) {
CatchSignal(SIGALRM, gotalarm_sig);
tdb_setalarm_sigptr(tdb, &gotalarm);
alarm(timeout);
}
if (rw_type == F_RDLCK)
ret = tdb_chainlock_read(tdb, key);
else
ret = tdb_chainlock(tdb, key);
if (timeout) {
alarm(0);
tdb_setalarm_sigptr(tdb, NULL);
CatchSignal(SIGALRM, SIG_IGN);
if (gotalarm && (ret == -1)) {
DEBUG(0,("tdb_chainlock_with_timeout_internal: alarm (%u) timed out for key %s in tdb %s\n",
timeout, key.dptr, tdb_name(tdb)));
/* TODO: If we time out waiting for a lock, it might
* be nice to use F_GETLK to get the pid of the
* process currently holding the lock and print that
* as part of the debugging message. -- mbp */
return -1;
}
}
return ret;
}
/****************************************************************************
Write lock a chain. Return -1 if timeout or lock failed.
****************************************************************************/
int tdb_chainlock_with_timeout( TDB_CONTEXT *tdb, TDB_DATA key, unsigned int timeout)
{
return tdb_chainlock_with_timeout_internal(tdb, key, timeout, F_WRLCK);
}
int tdb_lock_bystring_with_timeout(TDB_CONTEXT *tdb, const char *keyval,
int timeout)
{
TDB_DATA key = string_term_tdb_data(keyval);
return tdb_chainlock_with_timeout(tdb, key, timeout);
}
/****************************************************************************
Read lock a chain by string. Return -1 if timeout or lock failed.
****************************************************************************/
int tdb_read_lock_bystring_with_timeout(TDB_CONTEXT *tdb, const char *keyval, unsigned int timeout)
{
TDB_DATA key = string_term_tdb_data(keyval);
return tdb_chainlock_with_timeout_internal(tdb, key, timeout, F_RDLCK);
}
int tdb_trans_store_bystring(TDB_CONTEXT *tdb, const char *keystr,
TDB_DATA data, int flags)
{
TDB_DATA key = string_term_tdb_data(keystr);
return tdb_trans_store(tdb, key, data, flags);
}
/****************************************************************************
Useful pair of routines for packing/unpacking data consisting of
integers and strings.
****************************************************************************/
static size_t tdb_pack_va(uint8 *buf, int bufsize, const char *fmt, va_list ap)
{
uint8 bt;
uint16 w;
uint32 d;
int i;
void *p;
int len;
char *s;
char c;
uint8 *buf0 = buf;
const char *fmt0 = fmt;
int bufsize0 = bufsize;
while (*fmt) {
switch ((c = *fmt++)) {
case 'b': /* unsigned 8-bit integer */
len = 1;
bt = (uint8)va_arg(ap, int);
if (bufsize && bufsize >= len)
SSVAL(buf, 0, bt);
break;
case 'w': /* unsigned 16-bit integer */
len = 2;
w = (uint16)va_arg(ap, int);
if (bufsize && bufsize >= len)
SSVAL(buf, 0, w);
break;
case 'd': /* signed 32-bit integer (standard int in most systems) */
len = 4;
d = va_arg(ap, uint32);
if (bufsize && bufsize >= len)
SIVAL(buf, 0, d);
break;
case 'p': /* pointer */
len = 4;
p = va_arg(ap, void *);
d = p?1:0;
if (bufsize && bufsize >= len)
SIVAL(buf, 0, d);
break;
case 'P': /* null-terminated string */
s = va_arg(ap,char *);
w = strlen(s);
len = w + 1;
if (bufsize && bufsize >= len)
memcpy(buf, s, len);
break;
case 'f': /* null-terminated string */
s = va_arg(ap,char *);
w = strlen(s);
len = w + 1;
if (bufsize && bufsize >= len)
memcpy(buf, s, len);
break;
case 'B': /* fixed-length string */
i = va_arg(ap, int);
s = va_arg(ap, char *);
len = 4+i;
if (bufsize && bufsize >= len) {
SIVAL(buf, 0, i);
memcpy(buf+4, s, i);
}
break;
default:
DEBUG(0,("Unknown tdb_pack format %c in %s\n",
c, fmt));
len = 0;
break;
}
buf += len;
if (bufsize)
bufsize -= len;
if (bufsize < 0)
bufsize = 0;
}
DEBUG(18,("tdb_pack_va(%s, %d) -> %d\n",
fmt0, bufsize0, (int)PTR_DIFF(buf, buf0)));
return PTR_DIFF(buf, buf0);
}
size_t tdb_pack(uint8 *buf, int bufsize, const char *fmt, ...)
{
va_list ap;
size_t result;
va_start(ap, fmt);
result = tdb_pack_va(buf, bufsize, fmt, ap);
va_end(ap);
return result;
}
bool tdb_pack_append(TALLOC_CTX *mem_ctx, uint8 **buf, size_t *len,
const char *fmt, ...)
{
va_list ap;
size_t len1, len2;
va_start(ap, fmt);
len1 = tdb_pack_va(NULL, 0, fmt, ap);
va_end(ap);
if (mem_ctx != NULL) {
*buf = talloc_realloc(mem_ctx, *buf, uint8,
(*len) + len1);
} else {
*buf = SMB_REALLOC_ARRAY(*buf, uint8, (*len) + len1);
}
if (*buf == NULL) {
return False;
}
va_start(ap, fmt);
len2 = tdb_pack_va((*buf)+(*len), len1, fmt, ap);
va_end(ap);
if (len1 != len2) {
return False;
}
*len += len2;
return True;
}
/****************************************************************************
Useful pair of routines for packing/unpacking data consisting of
integers and strings.
****************************************************************************/
int tdb_unpack(const uint8 *buf, int bufsize, const char *fmt, ...)
{
va_list ap;
uint8 *bt;
uint16 *w;
uint32 *d;
int len;
int *i;
void **p;
char *s, **b, **ps;
char c;
const uint8 *buf0 = buf;
const char *fmt0 = fmt;
int bufsize0 = bufsize;
va_start(ap, fmt);
while (*fmt) {
switch ((c=*fmt++)) {
case 'b': /* unsigned 8-bit integer */
len = 1;
bt = va_arg(ap, uint8 *);
if (bufsize < len)
goto no_space;
*bt = SVAL(buf, 0);
break;
case 'w': /* unsigned 16-bit integer */
len = 2;
w = va_arg(ap, uint16 *);
if (bufsize < len)
goto no_space;
*w = SVAL(buf, 0);
break;
case 'd': /* signed 32-bit integer (standard int in most systems) */
len = 4;
d = va_arg(ap, uint32 *);
if (bufsize < len)
goto no_space;
*d = IVAL(buf, 0);
break;
case 'p': /* pointer */
len = 4;
p = va_arg(ap, void **);
if (bufsize < len)
goto no_space;
/*
* This isn't a real pointer - only a token (1 or 0)
* to mark the fact a pointer is present.
*/
*p = (void *)(IVAL(buf, 0) ? (void *)1 : NULL);
break;
case 'P': /* null-terminated string */
/* Return malloc'ed string. */
ps = va_arg(ap,char **);
len = strlen((const char *)buf) + 1;
*ps = SMB_STRDUP((const char *)buf);
break;
case 'f': /* null-terminated string */
s = va_arg(ap,char *);
len = strlen((const char *)buf) + 1;
if (bufsize < len || len > sizeof(fstring))
goto no_space;
memcpy(s, buf, len);
break;
case 'B': /* fixed-length string */
i = va_arg(ap, int *);
b = va_arg(ap, char **);
len = 4;
if (bufsize < len)
goto no_space;
*i = IVAL(buf, 0);
if (! *i) {
*b = NULL;
break;
}
len += *i;
if (bufsize < len)
goto no_space;
*b = (char *)SMB_MALLOC(*i);
if (! *b)
goto no_space;
memcpy(*b, buf+4, *i);
break;
default:
DEBUG(0,("Unknown tdb_unpack format %c in %s\n",
c, fmt));
len = 0;
break;
}
buf += len;
bufsize -= len;
}
va_end(ap);
DEBUG(18,("tdb_unpack(%s, %d) -> %d\n",
fmt0, bufsize0, (int)PTR_DIFF(buf, buf0)));
return PTR_DIFF(buf, buf0);
no_space:
va_end(ap);
return -1;
}
/****************************************************************************
Log tdb messages via DEBUG().
****************************************************************************/
static void tdb_log(TDB_CONTEXT *tdb, enum tdb_debug_level level, const char *format, ...)
{
va_list ap;
char *ptr = NULL;
int ret;
va_start(ap, format);
ret = vasprintf(&ptr, format, ap);
va_end(ap);
if ((ret == -1) || !*ptr)
return;
DEBUG((int)level, ("tdb(%s): %s", tdb_name(tdb) ? tdb_name(tdb) : "unnamed", ptr));
SAFE_FREE(ptr);
}
/****************************************************************************
Like tdb_open() but also setup a logging function that redirects to
the samba DEBUG() system.
****************************************************************************/
TDB_CONTEXT *tdb_open_log(const char *name, int hash_size, int tdb_flags,
int open_flags, mode_t mode)
{
TDB_CONTEXT *tdb;
struct tdb_logging_context log_ctx;
if (!lp_use_mmap())
tdb_flags |= TDB_NOMMAP;
log_ctx.log_fn = tdb_log;
log_ctx.log_private = NULL;
if ((hash_size == 0) && (name != NULL)) {
const char *base = strrchr_m(name, '/');
if (base != NULL) {
base += 1;
}
else {
base = name;
}
hash_size = lp_parm_int(-1, "tdb_hashsize", base, 0);
}
tdb = tdb_open_ex(name, hash_size, tdb_flags,
open_flags, mode, &log_ctx, NULL);
if (!tdb)
return NULL;
return tdb;
}
/****************************************************************************
tdb_store, wrapped in a transaction. This way we make sure that a process
that dies within writing does not leave a corrupt tdb behind.
****************************************************************************/
int tdb_trans_store(struct tdb_context *tdb, TDB_DATA key, TDB_DATA dbuf,
int flag)
{
int res;
if ((res = tdb_transaction_start(tdb)) != 0) {
DEBUG(5, ("tdb_transaction_start failed\n"));
return res;
}
if ((res = tdb_store(tdb, key, dbuf, flag)) != 0) {
DEBUG(10, ("tdb_store failed\n"));
tdb_transaction_cancel(tdb);
return res;
}
if ((res = tdb_transaction_commit(tdb)) != 0) {
DEBUG(5, ("tdb_transaction_commit failed\n"));
}
return res;
}
/****************************************************************************
tdb_delete, wrapped in a transaction. This way we make sure that a process
that dies within deleting does not leave a corrupt tdb behind.
****************************************************************************/
int tdb_trans_delete(struct tdb_context *tdb, TDB_DATA key)
{
int res;
if ((res = tdb_transaction_start(tdb)) != 0) {
DEBUG(5, ("tdb_transaction_start failed\n"));
return res;
}
if ((res = tdb_delete(tdb, key)) != 0) {
DEBUG(10, ("tdb_delete failed\n"));
tdb_transaction_cancel(tdb);
return res;
}
if ((res = tdb_transaction_commit(tdb)) != 0) {
DEBUG(5, ("tdb_transaction_commit failed\n"));
}
return res;
}
NTSTATUS map_nt_error_from_tdb(enum TDB_ERROR err)
{
NTSTATUS result = NT_STATUS_INTERNAL_ERROR;
switch (err) {
case TDB_SUCCESS:
result = NT_STATUS_OK;
break;
case TDB_ERR_CORRUPT:
result = NT_STATUS_INTERNAL_DB_CORRUPTION;
break;
case TDB_ERR_IO:
result = NT_STATUS_UNEXPECTED_IO_ERROR;
break;
case TDB_ERR_OOM:
result = NT_STATUS_NO_MEMORY;
break;
case TDB_ERR_EXISTS:
result = NT_STATUS_OBJECT_NAME_COLLISION;
break;
case TDB_ERR_LOCK:
/*
* TDB_ERR_LOCK is very broad, we could for example
* distinguish between fcntl locks and invalid lock
* sequences. So NT_STATUS_FILE_LOCK_CONFLICT is a
* compromise.
*/
result = NT_STATUS_FILE_LOCK_CONFLICT;
break;
case TDB_ERR_NOLOCK:
case TDB_ERR_LOCK_TIMEOUT:
/*
* These two ones in the enum are not actually used
*/
result = NT_STATUS_FILE_LOCK_CONFLICT;
break;
case TDB_ERR_NOEXIST:
result = NT_STATUS_NOT_FOUND;
break;
case TDB_ERR_EINVAL:
result = NT_STATUS_INVALID_PARAMETER;
break;
case TDB_ERR_RDONLY:
result = NT_STATUS_ACCESS_DENIED;
break;
case TDB_ERR_NESTING:
result = NT_STATUS_INTERNAL_ERROR;
break;
};
return result;
}
int tdb_data_cmp(TDB_DATA t1, TDB_DATA t2)
{
int ret;
if (t1.dptr == NULL && t2.dptr != NULL) {
return -1;
}
if (t1.dptr != NULL && t2.dptr == NULL) {
return 1;
}
if (t1.dptr == t2.dptr) {
return t1.dsize - t2.dsize;
}
ret = memcmp(t1.dptr, t2.dptr, MIN(t1.dsize, t2.dsize));
if (ret == 0) {
return t1.dsize - t2.dsize;
}
return ret;
}
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