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systemd/tdb/tdbutil.c

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/*
Unix SMB/CIFS implementation.
tdb utility functions
Copyright (C) Andrew Tridgell 1992-1998
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"
#include <fnmatch.h>
/* 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(void)
{
gotalarm = 1;
}
/***************************************************************
Make a TDB_DATA and keep the const warning in one place
****************************************************************/
static TDB_DATA make_tdb_data(const char *dptr, size_t dsize)
{
TDB_DATA ret;
ret.dptr = dptr;
ret.dsize = dsize;
return ret;
}
/****************************************************************************
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;
tdb_set_lock_alarm(&gotalarm);
if (timeout) {
CatchSignal(SIGALRM, SIGNAL_CAST gotalarm_sig);
alarm(timeout);
}
if (rw_type == F_RDLCK)
ret = tdb_chainlock_read(tdb, key);
else
ret = tdb_chainlock(tdb, key);
if (timeout) {
alarm(0);
CatchSignal(SIGALRM, SIGNAL_CAST SIG_IGN);
if (gotalarm) {
DEBUG(0,("tdb_chainlock_with_timeout_internal: alarm (%u) timed out for key %s in tdb %s\n",
timeout, key.dptr, tdb->name ));
/* 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);
}
/****************************************************************************
Lock a chain by string. Return -1 if timeout or lock failed.
****************************************************************************/
int tdb_lock_bystring(TDB_CONTEXT *tdb, const char *keyval, unsigned int timeout)
{
TDB_DATA key = make_tdb_data(keyval, strlen(keyval)+1);
return tdb_chainlock_with_timeout_internal(tdb, key, timeout, F_WRLCK);
}
/****************************************************************************
Unlock a chain by string.
****************************************************************************/
void tdb_unlock_bystring(TDB_CONTEXT *tdb, const char *keyval)
{
TDB_DATA key = make_tdb_data(keyval, strlen(keyval)+1);
tdb_chainunlock(tdb, key);
}
/****************************************************************************
Read lock a chain by string. Return -1 if timeout or lock failed.
****************************************************************************/
int tdb_read_lock_bystring(TDB_CONTEXT *tdb, const char *keyval, unsigned int timeout)
{
TDB_DATA key = make_tdb_data(keyval, strlen(keyval)+1);
return tdb_chainlock_with_timeout_internal(tdb, key, timeout, F_RDLCK);
}
/****************************************************************************
Read unlock a chain by string.
****************************************************************************/
void tdb_read_unlock_bystring(TDB_CONTEXT *tdb, const char *keyval)
{
TDB_DATA key = make_tdb_data(keyval, strlen(keyval)+1);
tdb_chainunlock_read(tdb, key);
}
/****************************************************************************
Fetch a int32 value by a arbitrary blob key, return -1 if not found.
Output is int32 in native byte order.
****************************************************************************/
int32 tdb_fetch_int32_byblob(TDB_CONTEXT *tdb, const char *keyval, size_t len)
{
TDB_DATA key = make_tdb_data(keyval, len);
TDB_DATA data;
int32 ret;
data = tdb_fetch(tdb, key);
if (!data.dptr || data.dsize != sizeof(int32)) {
SAFE_FREE(data.dptr);
return -1;
}
ret = IVAL(data.dptr,0);
SAFE_FREE(data.dptr);
return ret;
}
/****************************************************************************
Fetch a int32 value by string key, return -1 if not found.
Output is int32 in native byte order.
****************************************************************************/
int32 tdb_fetch_int32(TDB_CONTEXT *tdb, const char *keystr)
{
return tdb_fetch_int32_byblob(tdb, keystr, strlen(keystr) + 1);
}
/****************************************************************************
Store a int32 value by an arbitary blob key, return 0 on success, -1 on failure.
Input is int32 in native byte order. Output in tdb is in little-endian.
****************************************************************************/
int tdb_store_int32_byblob(TDB_CONTEXT *tdb, const char *keystr, size_t len, int32 v)
{
TDB_DATA key = make_tdb_data(keystr, len);
TDB_DATA data;
int32 v_store;
SIVAL(&v_store,0,v);
data.dptr = (void *)&v_store;
data.dsize = sizeof(int32);
return tdb_store(tdb, key, data, TDB_REPLACE);
}
/****************************************************************************
Store a int32 value by string key, return 0 on success, -1 on failure.
Input is int32 in native byte order. Output in tdb is in little-endian.
****************************************************************************/
int tdb_store_int32(TDB_CONTEXT *tdb, const char *keystr, int32 v)
{
return tdb_store_int32_byblob(tdb, keystr, strlen(keystr) + 1, v);
}
/****************************************************************************
Fetch a uint32 value by a arbitrary blob key, return -1 if not found.
Output is uint32 in native byte order.
****************************************************************************/
BOOL tdb_fetch_uint32_byblob(TDB_CONTEXT *tdb, const char *keyval, size_t len, uint32 *value)
{
TDB_DATA key = make_tdb_data(keyval, len);
TDB_DATA data;
data = tdb_fetch(tdb, key);
if (!data.dptr || data.dsize != sizeof(uint32)) {
SAFE_FREE(data.dptr);
return False;
}
*value = IVAL(data.dptr,0);
SAFE_FREE(data.dptr);
return True;
}
/****************************************************************************
Fetch a uint32 value by string key, return -1 if not found.
Output is uint32 in native byte order.
****************************************************************************/
BOOL tdb_fetch_uint32(TDB_CONTEXT *tdb, const char *keystr, uint32 *value)
{
return tdb_fetch_uint32_byblob(tdb, keystr, strlen(keystr) + 1, value);
}
/****************************************************************************
Store a uint32 value by an arbitary blob key, return 0 on success, -1 on failure.
Input is uint32 in native byte order. Output in tdb is in little-endian.
****************************************************************************/
BOOL tdb_store_uint32_byblob(TDB_CONTEXT *tdb, const char *keystr, size_t len, uint32 value)
{
TDB_DATA key = make_tdb_data(keystr, len);
TDB_DATA data;
uint32 v_store;
BOOL ret = True;
SIVAL(&v_store, 0, value);
data.dptr = (void *)&v_store;
data.dsize = sizeof(uint32);
if (tdb_store(tdb, key, data, TDB_REPLACE) == -1)
ret = False;
return ret;
}
/****************************************************************************
Store a uint32 value by string key, return 0 on success, -1 on failure.
Input is uint32 in native byte order. Output in tdb is in little-endian.
****************************************************************************/
BOOL tdb_store_uint32(TDB_CONTEXT *tdb, const char *keystr, uint32 value)
{
return tdb_store_uint32_byblob(tdb, keystr, strlen(keystr) + 1, value);
}
/****************************************************************************
Store a buffer by a null terminated string key. Return 0 on success, -1
on failure.
****************************************************************************/
int tdb_store_bystring(TDB_CONTEXT *tdb, const char *keystr, TDB_DATA data, int flags)
{
TDB_DATA key = make_tdb_data(keystr, strlen(keystr)+1);
return tdb_store(tdb, key, data, flags);
}
/****************************************************************************
Fetch a buffer using a null terminated string key. Don't forget to call
free() on the result dptr.
****************************************************************************/
TDB_DATA tdb_fetch_bystring(TDB_CONTEXT *tdb, const char *keystr)
{
TDB_DATA key = make_tdb_data(keystr, strlen(keystr)+1);
return tdb_fetch(tdb, key);
}
/****************************************************************************
Delete an entry using a null terminated string key.
****************************************************************************/
int tdb_delete_bystring(TDB_CONTEXT *tdb, const char *keystr)
{
TDB_DATA key = make_tdb_data(keystr, strlen(keystr)+1);
return tdb_delete(tdb, key);
}
/****************************************************************************
Atomic integer change. Returns old value. To create, set initial value in *oldval.
****************************************************************************/
int32 tdb_change_int32_atomic(TDB_CONTEXT *tdb, const char *keystr, int32 *oldval, int32 change_val)
{
int32 val;
int32 ret = -1;
if (tdb_lock_bystring(tdb, keystr,0) == -1)
return -1;
if ((val = tdb_fetch_int32(tdb, keystr)) == -1) {
/* The lookup failed */
if (tdb_error(tdb) != TDB_ERR_NOEXIST) {
/* but not because it didn't exist */
goto err_out;
}
/* Start with 'old' value */
val = *oldval;
} else {
/* It worked, set return value (oldval) to tdb data */
*oldval = val;
}
/* Increment value for storage and return next time */
val += change_val;
if (tdb_store_int32(tdb, keystr, val) == -1)
goto err_out;
ret = 0;
err_out:
tdb_unlock_bystring(tdb, keystr);
return ret;
}
/****************************************************************************
Atomic unsigned integer change. Returns old value. To create, set initial value in *oldval.
****************************************************************************/
BOOL tdb_change_uint32_atomic(TDB_CONTEXT *tdb, const char *keystr, uint32 *oldval, uint32 change_val)
{
uint32 val;
BOOL ret = False;
if (tdb_lock_bystring(tdb, keystr,0) == -1)
return False;
if (!tdb_fetch_uint32(tdb, keystr, &val)) {
/* It failed */
if (tdb_error(tdb) != TDB_ERR_NOEXIST) {
/* and not because it didn't exist */
goto err_out;
}
/* Start with 'old' value */
val = *oldval;
} else {
/* it worked, set return value (oldval) to tdb data */
*oldval = val;
}
/* get a new value to store */
val += change_val;
if (!tdb_store_uint32(tdb, keystr, val))
goto err_out;
ret = True;
err_out:
tdb_unlock_bystring(tdb, keystr);
return ret;
}
/****************************************************************************
Useful pair of routines for packing/unpacking data consisting of
integers and strings.
****************************************************************************/
size_t tdb_pack(char *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;
char *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 = (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;
}
va_end(ap);
DEBUG(18,("tdb_pack(%s, %d) -> %d\n",
fmt0, bufsize0, (int)PTR_DIFF(buf, buf0)));
return PTR_DIFF(buf, buf0);
}
/****************************************************************************
Useful pair of routines for packing/unpacking data consisting of
integers and strings.
****************************************************************************/
int tdb_unpack(char *buf, int bufsize, const char *fmt, ...)
{
va_list ap;
uint8 *bt;
uint16 *w;
uint32 *d;
int len;
int *i;
void **p;
char *s, **b;
char c;
char *buf0 = buf;
const char *fmt0 = fmt;
int bufsize0 = bufsize;
va_start(ap, fmt);
while (*fmt) {
switch ((c=*fmt++)) {
case 'b':
len = 1;
bt = va_arg(ap, uint8 *);
if (bufsize < len)
goto no_space;
*bt = SVAL(buf, 0);
break;
case 'w':
len = 2;
w = va_arg(ap, uint16 *);
if (bufsize < len)
goto no_space;
*w = SVAL(buf, 0);
break;
case 'd':
len = 4;
d = va_arg(ap, uint32 *);
if (bufsize < len)
goto no_space;
*d = IVAL(buf, 0);
break;
case 'p':
len = 4;
p = va_arg(ap, void **);
if (bufsize < len)
goto no_space;
*p = (void *)IVAL(buf, 0);
break;
case 'P':
s = va_arg(ap,char *);
len = strlen(buf) + 1;
if (bufsize < len || len > sizeof(pstring))
goto no_space;
memcpy(s, buf, len);
break;
case 'f':
s = va_arg(ap,char *);
len = strlen(buf) + 1;
if (bufsize < len || len > sizeof(fstring))
goto no_space;
memcpy(s, buf, len);
break;
case 'B':
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 *)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:
return -1;
}
/**
* Pack SID passed by pointer
*
* @param pack_buf pointer to buffer which is to be filled with packed data
* @param bufsize size of packing buffer
* @param sid pointer to sid to be packed
*
* @return length of the packed representation of the whole structure
**/
size_t tdb_sid_pack(char* pack_buf, int bufsize, DOM_SID* sid)
{
int idx;
size_t len = 0;
if (!sid || !pack_buf) return -1;
len += tdb_pack(pack_buf + len, bufsize - len, "bb", sid->sid_rev_num,
sid->num_auths);
for (idx = 0; idx < 6; idx++) {
len += tdb_pack(pack_buf + len, bufsize - len, "b", sid->id_auth[idx]);
}
for (idx = 0; idx < MAXSUBAUTHS; idx++) {
len += tdb_pack(pack_buf + len, bufsize - len, "d", sid->sub_auths[idx]);
}
return len;
}
/**
* Unpack SID into a pointer
*
* @param pack_buf pointer to buffer with packed representation
* @param bufsize size of the buffer
* @param sid pointer to sid structure to be filled with unpacked data
*
* @return size of structure unpacked from buffer
**/
size_t tdb_sid_unpack(char* pack_buf, int bufsize, DOM_SID* sid)
{
int idx, len = 0;
if (!sid || !pack_buf) return -1;
len += tdb_unpack(pack_buf + len, bufsize - len, "bb",
&sid->sid_rev_num, &sid->num_auths);
for (idx = 0; idx < 6; idx++) {
len += tdb_unpack(pack_buf + len, bufsize - len, "b", &sid->id_auth[idx]);
}
for (idx = 0; idx < MAXSUBAUTHS; idx++) {
len += tdb_unpack(pack_buf + len, bufsize - len, "d", &sid->sub_auths[idx]);
}
return len;
}
/**
* Pack TRUSTED_DOM_PASS passed by pointer
*
* @param pack_buf pointer to buffer which is to be filled with packed data
* @param bufsize size of the buffer
* @param pass pointer to trusted domain password to be packed
*
* @return length of the packed representation of the whole structure
**/
size_t tdb_trusted_dom_pass_pack(char* pack_buf, int bufsize, TRUSTED_DOM_PASS* pass)
{
int idx, len = 0;
if (!pack_buf || !pass) return -1;
/* packing unicode domain name and password */
len += tdb_pack(pack_buf + len, bufsize - len, "d", pass->uni_name_len);
for (idx = 0; idx < 32; idx++)
len += tdb_pack(pack_buf + len, bufsize - len, "w", pass->uni_name[idx]);
len += tdb_pack(pack_buf + len, bufsize - len, "dPd", pass->pass_len,
pass->pass, pass->mod_time);
/* packing SID structure */
len += tdb_sid_pack(pack_buf + len, bufsize - len, &pass->domain_sid);
return len;
}
/**
* Unpack TRUSTED_DOM_PASS passed by pointer
*
* @param pack_buf pointer to buffer with packed representation
* @param bufsize size of the buffer
* @param pass pointer to trusted domain password to be filled with unpacked data
*
* @return size of structure unpacked from buffer
**/
size_t tdb_trusted_dom_pass_unpack(char* pack_buf, int bufsize, TRUSTED_DOM_PASS* pass)
{
int idx, len = 0;
if (!pack_buf || !pass) return -1;
/* unpack unicode domain name and plaintext password */
len += tdb_unpack(pack_buf, bufsize - len, "d", &pass->uni_name_len);
for (idx = 0; idx < 32; idx++)
len += tdb_unpack(pack_buf + len, bufsize - len, "w", &pass->uni_name[idx]);
len += tdb_unpack(pack_buf + len, bufsize - len, "dPd", &pass->pass_len, &pass->pass,
&pass->mod_time);
/* unpack domain sid */
len += tdb_sid_unpack(pack_buf + len, bufsize - len, &pass->domain_sid);
return len;
}
/****************************************************************************
Log tdb messages via DEBUG().
****************************************************************************/
static void tdb_log(TDB_CONTEXT *tdb, int level, const char *format, ...)
{
va_list ap;
char *ptr = NULL;
va_start(ap, format);
vasprintf(&ptr, format, ap);
va_end(ap);
if (!ptr || !*ptr)
return;
DEBUG(level, ("tdb(%s): %s", tdb->name ? tdb->name : "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;
if (!lp_use_mmap())
tdb_flags |= TDB_NOMMAP;
tdb = tdb_open_ex(name, hash_size, tdb_flags,
open_flags, mode, tdb_log);
if (!tdb)
return NULL;
return tdb;
}
/****************************************************************************
Allow tdb_delete to be used as a tdb_traversal_fn.
****************************************************************************/
int tdb_traverse_delete_fn(TDB_CONTEXT *the_tdb, TDB_DATA key, TDB_DATA dbuf,
void *state)
{
return tdb_delete(the_tdb, key);
}
/**
* Search across the whole tdb for keys that match the given pattern
* return the result as a list of keys
*
* @param tdb pointer to opened tdb file context
* @param pattern searching pattern used by fnmatch(3) functions
*
* @return list of keys found by looking up with given pattern
**/
TDB_LIST_NODE *tdb_search_keys(TDB_CONTEXT *tdb, const char* pattern)
{
TDB_DATA key, next;
TDB_LIST_NODE *list = NULL;
TDB_LIST_NODE *rec = NULL;
TDB_LIST_NODE *tmp = NULL;
for (key = tdb_firstkey(tdb); key.dptr; key = next) {
/* duplicate key string to ensure null-termination */
char *key_str = (char*) strndup(key.dptr, key.dsize);
if (!key_str) {
DEBUG(0, ("tdb_search_keys: strndup() failed!\n"));
smb_panic("strndup failed!\n");
}
DEBUG(18, ("checking %s for match to pattern %s\n", key_str, pattern));
next = tdb_nextkey(tdb, key);
/* do the pattern checking */
if (fnmatch(pattern, key_str, 0) == 0) {
rec = (TDB_LIST_NODE*) malloc(sizeof(*rec));
ZERO_STRUCTP(rec);
rec->node_key = key;
DLIST_ADD_END(list, rec, tmp);
DEBUG(18, ("checking %s matched pattern %s\n", key_str, pattern));
} else {
free(key.dptr);
}
/* free duplicated key string */
free(key_str);
}
return list;
};
/**
* Free the list returned by tdb_search_keys
*
* @param node list of results found by tdb_search_keys
**/
void tdb_search_list_free(TDB_LIST_NODE* node)
{
TDB_LIST_NODE *next_node;
while (node) {
next_node = node->next;
SAFE_FREE(node->node_key.dptr);
SAFE_FREE(node);
node = next_node;
};
};
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