r26200: Bring back some accidently removed files.

(This used to be commit a71e40ab5dc7f0a5f6d2d1eb930f378cd143b186)

3 files changed, 456 insertions, 0 deletions

diff --git a/source4/lib/ldb/ldb_tdb/ldb_tdb_wrap.c b/source4/lib/ldb/ldb_tdb/ldb_tdb_wrap.c
new file mode 100644
index 00000000000..654574cd2f8
--- /dev/null
+++ b/source4/lib/ldb/ldb_tdb/ldb_tdb_wrap.c
@@ -0,0 +1,153 @@
+/* 
+   ldb database library
+
+   Copyright (C) Andrew Tridgell  2005
+
+     ** NOTE! The following LGPL license applies to the ldb
+     ** library. This does NOT imply that all of Samba is released
+     ** under the LGPL
+   
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 3 of the License, or (at your option) any later version.
+
+   This library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "ldb_includes.h"
+
+#include "ldb_tdb.h"
+
+/*
+  the purpose of this code is to work around the braindead posix locking
+  rules, to allow us to have a ldb open more than once while allowing 
+  locking to work
+*/
+
+struct ltdb_wrap {
+	struct ltdb_wrap *next, *prev;
+	struct tdb_context *tdb;
+	dev_t device;
+	ino_t inode;
+};
+
+static struct ltdb_wrap *tdb_list;
+
+/* destroy the last connection to a tdb */
+static int ltdb_wrap_destructor(struct ltdb_wrap *w)
+{
+	tdb_close(w->tdb);
+	if (w->next) {
+		w->next->prev = w->prev;
+	}
+	if (w->prev) {
+		w->prev->next = w->next;
+	}
+	if (w == tdb_list) {
+		tdb_list = w->next;
+	}
+	return 0;
+}				 
+
+static void ltdb_log_fn(struct tdb_context *tdb, enum tdb_debug_level level, const char *fmt, ...) PRINTF_ATTRIBUTE(3, 4);
+static void ltdb_log_fn(struct tdb_context *tdb, enum tdb_debug_level level, const char *fmt, ...)
+{
+	va_list ap;
+	const char *name = tdb_name(tdb);
+	struct ldb_context *ldb = talloc_get_type(tdb_get_logging_private(tdb), struct ldb_context);
+	enum ldb_debug_level ldb_level;
+	char *message; 
+	va_start(ap, fmt);
+	message = talloc_vasprintf(ldb, fmt, ap);
+	va_end(ap);
+
+	switch (level) {
+	case TDB_DEBUG_FATAL:
+		ldb_level = LDB_DEBUG_FATAL;
+		break;
+	case TDB_DEBUG_ERROR:
+		ldb_level = LDB_DEBUG_ERROR;
+		break;
+	case TDB_DEBUG_WARNING:
+		ldb_level = LDB_DEBUG_WARNING;
+		break;
+	case TDB_DEBUG_TRACE:
+		ldb_level = LDB_DEBUG_TRACE;
+		break;
+	default:
+		ldb_level = LDB_DEBUG_FATAL;
+	}
+
+	ldb_debug(ldb, ldb_level, "ltdb: tdb(%s): %s", name, message);
+	talloc_free(message);
+}
+
+/*
+  wrapped connection to a tdb database. The caller should _not_ free
+  this as it is not a talloc structure (as tdb does not use talloc
+  yet). It will auto-close when the caller frees the mem_ctx that is
+  passed to this call
+ */
+struct tdb_context *ltdb_wrap_open(TALLOC_CTX *mem_ctx,
+				   const char *path, int hash_size, 
+				   int tdb_flags,
+				   int open_flags, mode_t mode, 
+				   struct ldb_context *ldb)
+{
+	struct ltdb_wrap *w;
+	struct stat st;
+	struct tdb_logging_context log_ctx;
+
+	log_ctx.log_fn = ltdb_log_fn;
+	log_ctx.log_private = ldb;
+
+	if (stat(path, &st) == 0) {
+		for (w=tdb_list;w;w=w->next) {
+			if (st.st_dev == w->device && st.st_ino == w->inode) {
+				if (!talloc_reference(mem_ctx, w)) {
+					return NULL;
+				}
+				return w->tdb;
+			}
+		}
+	}
+
+	w = talloc(mem_ctx, struct ltdb_wrap);
+	if (w == NULL) {
+		return NULL;
+	}
+
+	w->tdb = tdb_open_ex(path, hash_size, tdb_flags, open_flags, mode, &log_ctx, NULL);
+	if (w->tdb == NULL) {
+		talloc_free(w);
+		return NULL;
+	}
+
+	if (fstat(tdb_fd(w->tdb), &st) != 0) {
+		tdb_close(w->tdb);
+		talloc_free(w);
+		return NULL;
+	}
+
+	w->device = st.st_dev;
+	w->inode  = st.st_ino;
+
+	talloc_set_destructor(w, ltdb_wrap_destructor);
+
+	w->next = tdb_list;
+	w->prev = NULL;
+	if (tdb_list) {
+		tdb_list->prev = w;
+	}
+	tdb_list = w;
+	
+	return w->tdb;
+}
+
diff --git a/source4/lib/ldb_wrap.c b/source4/lib/ldb_wrap.c
new file mode 100644
index 00000000000..21ca04997e7
--- /dev/null
+++ b/source4/lib/ldb_wrap.c
@@ -0,0 +1,186 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   LDB wrap functions
+
+   Copyright (C) Andrew Tridgell 2004
+   
+   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/>.
+*/
+
+/*
+  the stupidity of the unix fcntl locking design forces us to never
+  allow a database file to be opened twice in the same process. These
+  wrappers provide convenient access to a tdb or ldb, taking advantage
+  of talloc destructors to ensure that only a single open is done
+*/
+
+#include "includes.h"
+#include "lib/events/events.h"
+#include "lib/ldb/include/ldb.h"
+#include "lib/ldb/include/ldb_errors.h"
+#include "lib/ldb-samba/ldif_handlers.h"
+#include "ldb_wrap.h"
+#include "dsdb/samdb/samdb.h"
+#include "param/param.h"
+
+/*
+  this is used to catch debug messages from ldb
+*/
+static void ldb_wrap_debug(void *context, enum ldb_debug_level level, 
+			   const char *fmt, va_list ap)  PRINTF_ATTRIBUTE(3,0);
+
+static void ldb_wrap_debug(void *context, enum ldb_debug_level level, 
+			   const char *fmt, va_list ap)
+{
+	int samba_level;
+	char *s = NULL;
+	switch (level) {
+	case LDB_DEBUG_FATAL:
+		samba_level = 0;
+		break;
+	case LDB_DEBUG_ERROR:
+		samba_level = 1;
+		break;
+	case LDB_DEBUG_WARNING:
+		samba_level = 2;
+		break;
+	case LDB_DEBUG_TRACE:
+		samba_level = 5;
+		break;
+		
+	};
+	vasprintf(&s, fmt, ap);
+	if (!s) return;
+	DEBUG(level, ("ldb: %s\n", s));
+	free(s);
+}
+
+/* check for memory leaks on the ldb context */
+static int ldb_wrap_destructor(struct ldb_context *ldb)
+{
+	size_t *startup_blocks = (size_t *)ldb_get_opaque(ldb, "startup_blocks");
+	if (startup_blocks &&
+	    talloc_total_blocks(ldb) > *startup_blocks + 400) {
+		DEBUG(0,("WARNING: probable memory leak in ldb %s - %lu blocks (startup %lu) %lu bytes\n",
+			 (char *)ldb_get_opaque(ldb, "wrap_url"), 
+			 (unsigned long)talloc_total_blocks(ldb), 
+			 (unsigned long)*startup_blocks,
+			 (unsigned long)talloc_total_size(ldb)));
+#if 0
+		talloc_report_full(ldb, stdout);
+		call_backtrace();
+		smb_panic("probable memory leak in ldb");
+#endif
+	}
+	return 0;
+}				 
+
+/*
+  wrapped connection to a ldb database
+  to close just talloc_free() the returned ldb_context
+
+  TODO:  We need an error_string parameter
+ */
+struct ldb_context *ldb_wrap_connect(TALLOC_CTX *mem_ctx,
+				     struct loadparm_context *lp_ctx,
+				     const char *url,
+				     struct auth_session_info *session_info,
+				     struct cli_credentials *credentials,
+				     unsigned int flags,
+				     const char *options[])
+{
+	struct ldb_context *ldb;
+	int ret;
+	struct event_context *ev;
+	char *real_url = NULL;
+	size_t *startup_blocks;
+
+	ldb = ldb_init(mem_ctx);
+	if (ldb == NULL) {
+		return NULL;
+	}
+
+	ldb_set_modules_dir(ldb, 
+			    talloc_asprintf(ldb, "%s/ldb", lp_modulesdir(lp_ctx)));
+
+	/* we want to use the existing event context if possible. This
+	   relies on the fact that in smbd, everything is a child of
+	   the main event_context */
+	ev = event_context_find(ldb);
+
+	if (ldb_set_opaque(ldb, "EventContext", ev)) {
+		talloc_free(ldb);
+		return NULL;
+	}
+
+	if (ldb_set_opaque(ldb, "sessionInfo", session_info)) {
+		talloc_free(ldb);
+		return NULL;
+	}
+
+	if (ldb_set_opaque(ldb, "credentials", credentials)) {
+		talloc_free(ldb);
+		return NULL;
+	}
+	
+	if (strcmp(lp_sam_url(lp_ctx), url) == 0) {
+		dsdb_set_global_schema(ldb);
+	}
+
+	ret = ldb_register_samba_handlers(ldb);
+	if (ret == -1) {
+		talloc_free(ldb);
+		return NULL;
+	}
+
+	ldb_set_debug(ldb, ldb_wrap_debug, NULL);
+
+	ldb_set_utf8_fns(ldb, NULL, wrap_casefold);
+
+	real_url = private_path(ldb, lp_ctx, url);
+	if (real_url == NULL) {
+		talloc_free(ldb);
+		return NULL;
+	}
+
+	/* allow admins to force non-sync ldb for all databases */
+	if (lp_parm_bool(lp_ctx, NULL, "ldb", "nosync", false)) {
+		flags |= LDB_FLG_NOSYNC;
+	}
+
+	/* we usually want Samba databases to be private. If we later
+	   find we need one public, we will need to add a parameter to
+	   ldb_wrap_connect() */
+	ldb_set_create_perms(ldb, 0600);
+	
+	ret = ldb_connect(ldb, real_url, flags, options);
+	if (ret != LDB_SUCCESS) {
+		talloc_free(ldb);
+		return NULL;
+	}
+
+	/* setup for leak detection */
+	ldb_set_opaque(ldb, "wrap_url", real_url);
+	startup_blocks = talloc(ldb, size_t);
+	*startup_blocks = talloc_total_blocks(ldb);
+	ldb_set_opaque(ldb, "startup_blocks", startup_blocks);
+	
+	talloc_set_destructor(ldb, ldb_wrap_destructor);
+
+	return ldb;
+}
+
+
+
diff --git a/source4/lib/tdb_wrap.c b/source4/lib/tdb_wrap.c
new file mode 100644
index 00000000000..37095dff2c0
--- /dev/null
+++ b/source4/lib/tdb_wrap.c
@@ -0,0 +1,117 @@
+/* 
+   Unix SMB/CIFS implementation.
+   TDB wrap functions
+
+   Copyright (C) Andrew Tridgell 2004
+   Copyright (C) Jelmer Vernooij <jelmer@samba.org> 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 "lib/tdb/include/tdb.h"
+#include "lib/util/dlinklist.h"
+#include "tdb_wrap.h"
+#include "tdb.h"
+
+static struct tdb_wrap *tdb_list;
+
+/* destroy the last connection to a tdb */
+static int tdb_wrap_destructor(struct tdb_wrap *w)
+{
+	tdb_close(w->tdb);
+	DLIST_REMOVE(tdb_list, w);
+	return 0;
+}				 
+
+/*
+ Log tdb messages via DEBUG().
+*/
+static void tdb_wrap_log(TDB_CONTEXT *tdb, enum tdb_debug_level level, 
+			 const char *format, ...) PRINTF_ATTRIBUTE(3,4);
+
+static void tdb_wrap_log(TDB_CONTEXT *tdb, enum tdb_debug_level level, 
+			 const char *format, ...)
+{
+	va_list ap;
+	char *ptr = NULL;
+	int debug_level;
+
+	va_start(ap, format);
+	vasprintf(&ptr, format, ap);
+	va_end(ap);
+	
+	switch (level) {
+	case TDB_DEBUG_FATAL:
+		debug_level = 0;
+		break;
+	case TDB_DEBUG_ERROR:
+		debug_level = 1;
+		break;
+	case TDB_DEBUG_WARNING:
+		debug_level = 2;
+		break;
+	case TDB_DEBUG_TRACE:
+		debug_level = 5;
+		break;
+	default:
+		debug_level = 0;
+	}		
+
+	if (ptr != NULL) {
+		const char *name = tdb_name(tdb);
+		DEBUG(debug_level, ("tdb(%s): %s", name ? name : "unnamed", ptr));
+		free(ptr);
+	}
+}
+
+
+/*
+  wrapped connection to a tdb database
+  to close just talloc_free() the tdb_wrap pointer
+ */
+struct tdb_wrap *tdb_wrap_open(TALLOC_CTX *mem_ctx,
+			       const char *name, int hash_size, int tdb_flags,
+			       int open_flags, mode_t mode)
+{
+	struct tdb_wrap *w;
+	struct tdb_logging_context log_ctx;
+	log_ctx.log_fn = tdb_wrap_log;
+
+	for (w=tdb_list;w;w=w->next) {
+		if (strcmp(name, w->name) == 0) {
+			return talloc_reference(mem_ctx, w);
+		}
+	}
+
+	w = talloc(mem_ctx, struct tdb_wrap);
+	if (w == NULL) {
+		return NULL;
+	}
+
+	w->name = talloc_strdup(w, name);
+
+	w->tdb = tdb_open_ex(name, hash_size, tdb_flags, 
+			     open_flags, mode, &log_ctx, NULL);
+	if (w->tdb == NULL) {
+		talloc_free(w);
+		return NULL;
+	}
+
+	talloc_set_destructor(w, tdb_wrap_destructor);
+
+	DLIST_ADD(tdb_list, w);
+
+	return w;
+}