util: util_ntdb.c

The first function is ntdb_new: this is preferred over ntdb_open, as
it makes the ntdb_context returned (and all NTDB_DATA returned from
ntdb_fetch) valid talloc pointers.

The API is very similar to tdb_wrap_open().

Note that we handle $TDB_NO_FSYNC here, since ntdb doesn't do that
hack (and it's great for speeding up testing!).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

3 files changed, 168 insertions, 0 deletions

diff --git a/lib/util/util_ntdb.c b/lib/util/util_ntdb.c
new file mode 100644
index 0000000000..9c3e2a5254
--- /dev/null
+++ b/lib/util/util_ntdb.c
@@ -0,0 +1,114 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   ntdb utility functions
+
+   Copyright (C) Rusty Russell 2012
+
+   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 "util_ntdb.h"
+#include "lib/param/param.h"
+
+static void *ntdb_talloc(const void *owner, size_t len, void *priv_data)
+{
+	return talloc_size(owner, len);
+}
+
+static void *ntdb_expand(void *old, size_t newlen, void *priv_data)
+{
+	return talloc_realloc_size(NULL, old, newlen);
+}
+
+static void ntdb_free(void *old, void *priv_data)
+{
+	talloc_free(old);
+}
+
+static int ntdb_destroy(struct ntdb_context *ntdb)
+{
+	ntdb_close(ntdb);
+	return 0;
+}
+
+static void ntdb_log(struct ntdb_context *ntdb,
+		     enum ntdb_log_level level,
+		     enum NTDB_ERROR ecode,
+		     const char *message,
+		     void *unused)
+{
+	int dl;
+	const char *name = ntdb_name(ntdb);
+
+	switch (level) {
+	case NTDB_LOG_USE_ERROR:
+	case NTDB_LOG_ERROR:
+		dl = 0;
+		break;
+	case NTDB_LOG_WARNING:
+		dl = 2;
+		break;
+	default:
+		dl = 0;
+	}
+
+	DEBUG(dl, ("ntdb(%s):%s: %s\n", name ? name : "unnamed",
+		   ntdb_errorstr(ecode), message));
+}
+
+struct ntdb_context *ntdb_new(TALLOC_CTX *ctx,
+			      const char *name, int ntdb_flags,
+			      int open_flags, mode_t mode,
+			      union ntdb_attribute *attr,
+			      struct loadparm_context *lp_ctx)
+{
+	union ntdb_attribute log_attr, alloc_attr;
+	struct ntdb_context *ntdb;
+
+	if (lp_ctx && !lpcfg_use_mmap(lp_ctx)) {
+		ntdb_flags |= NTDB_NOMMAP;
+	}
+
+	/* Great hack for speeding testing! */
+	if (getenv("TDB_NO_FSYNC")) {
+		ntdb_flags |= NTDB_NOSYNC;
+	}
+
+	log_attr.base.next = attr;
+	log_attr.base.attr = NTDB_ATTRIBUTE_LOG;
+	log_attr.log.fn = ntdb_log;
+
+	alloc_attr.base.next = &log_attr;
+	alloc_attr.base.attr = NTDB_ATTRIBUTE_ALLOCATOR;
+	alloc_attr.alloc.alloc = ntdb_talloc;
+	alloc_attr.alloc.expand = ntdb_expand;
+	alloc_attr.alloc.free = ntdb_free;
+
+	ntdb = ntdb_open(name, ntdb_flags, open_flags, mode, &alloc_attr);
+	if (!ntdb) {
+		return NULL;
+	}
+
+	/* We can re-use the tdb's path name for the talloc name */
+	name = ntdb_name(ntdb);
+	if (name) {
+		talloc_set_name_const(ntdb, name);
+	} else {
+		talloc_set_name_const(ntdb, "unnamed ntdb");
+	}
+	talloc_set_destructor(ntdb, ntdb_destroy);
+
+	return talloc_steal(ctx, ntdb);
+}
diff --git a/lib/util/util_ntdb.h b/lib/util/util_ntdb.h
new file mode 100644
index 0000000000..a5eab7f436
--- /dev/null
+++ b/lib/util/util_ntdb.h
@@ -0,0 +1,47 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   tdb utility functions
+
+   Copyright (C) Rusty Russell 2012
+
+   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/>.
+*/
+
+#ifndef _____LIB_UTIL_UTIL_NTDB_H__
+#define _____LIB_UTIL_UTIL_NTDB_H__
+#include <ntdb.h>
+#include <talloc.h>
+
+struct loadparm_context;
+union ntdb_attribute;
+
+/***************************************************************
+ Open an NTDB using talloc: it will be allocated off the context, and
+ all NTDB_DATA.dptr are allocated as children of the ntdb context.
+ Sets up a logging function for you, and uses lp_ctx to decide whether
+ to disable mmap.
+
+ Any extra ntdb attributes can be handed through attr; usually it's
+ NULL, ntdb_new provides logging and allocator attributes.
+
+ The destructor for the struct ntdb_context will do ntdb_close()
+ for you.
+****************************************************************/
+struct ntdb_context *ntdb_new(TALLOC_CTX *ctx,
+			      const char *name, int ntdb_flags,
+			      int open_flags, mode_t mode,
+			      union ntdb_attribute *attr,
+			      struct loadparm_context *lp_ctx);
+#endif /* _____LIB_UTIL_UTIL_NTDB_H__ */
diff --git a/lib/util/wscript_build b/lib/util/wscript_build
index 92221b9494..a955ab6a48 100755
--- a/lib/util/wscript_build
+++ b/lib/util/wscript_build
@@ -45,6 +45,13 @@ bld.SAMBA_LIBRARY('util_tdb',
 	private_library=True
 	)
 
+bld.SAMBA_LIBRARY('util_ntdb',
+	source='util_ntdb.c',
+	local_include=False,
+	public_deps='ntdb talloc samba-util samba-hostconfig',
+	private_library=True
+	)
+
 bld.SAMBA_LIBRARY('tevent-util',
 	source='tevent_unix.c tevent_ntstatus.c tevent_werror.c',
 	local_include=False,