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-rw-r--r--source4/tdb/tdbutil.c687
1 files changed, 687 insertions, 0 deletions
diff --git a/source4/tdb/tdbutil.c b/source4/tdb/tdbutil.c
new file mode 100644
index 0000000000..0d8f6128cc
--- /dev/null
+++ b/source4/tdb/tdbutil.c
@@ -0,0 +1,687 @@
+/*
+ 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_by_string(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_by_string(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_by_string(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 becouse 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 becouse 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;
+ 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 'w':
+ len = 2;
+ w = (uint16)va_arg(ap, int);
+ if (bufsize >= len)
+ SSVAL(buf, 0, w);
+ break;
+ case 'd':
+ len = 4;
+ d = va_arg(ap, uint32);
+ if (bufsize >= len)
+ SIVAL(buf, 0, d);
+ break;
+ case 'p':
+ len = 4;
+ p = va_arg(ap, void *);
+ d = p?1:0;
+ if (bufsize >= len)
+ SIVAL(buf, 0, d);
+ break;
+ case 'P':
+ s = va_arg(ap,char *);
+ w = strlen(s);
+ len = w + 1;
+ if (bufsize >= len)
+ memcpy(buf, s, len);
+ break;
+ case 'f':
+ s = va_arg(ap,char *);
+ w = strlen(s);
+ len = w + 1;
+ if (bufsize >= len)
+ memcpy(buf, s, len);
+ break;
+ case 'B':
+ i = va_arg(ap, int);
+ s = va_arg(ap, char *);
+ len = 4+i;
+ if (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;
+ bufsize -= len;
+ }
+
+ 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;
+ 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 '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;
+}
+
+/****************************************************************************
+ 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 = next_node;
+ };
+};
+
+