summaryrefslogtreecommitdiff
path: root/source4/lib/tdb/common/tdbutil.c
diff options
context:
space:
mode:
Diffstat (limited to 'source4/lib/tdb/common/tdbutil.c')
-rw-r--r--source4/lib/tdb/common/tdbutil.c718
1 files changed, 718 insertions, 0 deletions
diff --git a/source4/lib/tdb/common/tdbutil.c b/source4/lib/tdb/common/tdbutil.c
new file mode 100644
index 0000000000..62841ddfc2
--- /dev/null
+++ b/source4/lib/tdb/common/tdbutil.c
@@ -0,0 +1,718 @@
+/*
+ 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;
+}
+
+
+/*******************************************************************
+ THIS is a copy of the function CatchSignal found in lib/signal.c
+ I need to copy it there to avoid sucking all of the samba source
+ into tdb.
+
+ Catch a signal. This should implement the following semantics:
+
+ 1) The handler remains installed after being called.
+ 2) The signal should be blocked during handler execution.
+********************************************************************/
+
+static void (*TdbCatchSignal(int signum,void (*handler)(int )))(int)
+{
+#ifdef HAVE_SIGACTION
+ struct sigaction act;
+ struct sigaction oldact;
+
+ ZERO_STRUCT(act);
+
+ act.sa_handler = handler;
+#ifdef SA_RESTART
+ /*
+ * We *want* SIGALRM to interrupt a system call.
+ */
+ if(signum != SIGALRM)
+ act.sa_flags = SA_RESTART;
+#endif
+ sigemptyset(&act.sa_mask);
+ sigaddset(&act.sa_mask,signum);
+ sigaction(signum,&act,&oldact);
+ return oldact.sa_handler;
+#else /* !HAVE_SIGACTION */
+ /* FIXME: need to handle sigvec and systems with broken signal() */
+ return signal(signum, handler);
+#endif
+}
+
+
+
+/***************************************************************
+ 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) {
+ TdbCatchSignal(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);
+ TdbCatchSignal(SIGALRM, SIGNAL_CAST SIG_IGN);
+ if (gotalarm) {
+ tdb_debug(tdb, 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(TDB_CONTEXT *tdb, 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:
+ tdb_debug(tdb, 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);
+
+ tdb_debug(tdb, 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(TDB_CONTEXT *tdb, 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:
+ tdb_debug(tdb, 0, "Unknown tdb_unpack format %c in %s\n",
+ c, fmt);
+
+ len = 0;
+ break;
+ }
+
+ buf += len;
+ bufsize -= len;
+ }
+
+ va_end(ap);
+
+ tdb_debug(tdb, 18, "tdb_unpack(%s, %d) -> %d\n",
+ fmt0, bufsize0, (int)PTR_DIFF(buf, buf0));
+
+ return PTR_DIFF(buf, buf0);
+
+ no_space:
+ return -1;
+}
+
+/****************************************************************************
+ Print out debug messages.
+****************************************************************************/
+
+void tdb_debug(TDB_CONTEXT *tdb, int level, const char *fmt, ...)
+{
+ va_list ap;
+ if (tdb->log_fn == NULL) {
+ return;
+ }
+ va_start(ap, fmt);
+ tdb->log_fn(tdb, level, fmt, ap);
+ va_end(ap);
+}
+
+
+/****************************************************************************
+ 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;
+
+ 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 0
+ if (!key_str) {
+ tdb_debug(tdb, 0, "tdb_search_keys: strndup() failed!\n");
+ smb_panic("strndup failed!\n");
+ }
+#endif
+ tdb_debug(tdb, 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, TDB_LIST_NODE *);
+
+ tdb_debug(tdb, 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;
+ }
+}
generated by cgit (git 2.34.1) at 2024-12-16 02:33:05 +0000