From 8daa83a594a2e98f39d764422bfbdbc62c9efd44 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 19:20:00 +0200
Subject: Adding upstream version 2:4.20.0+dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 source3/libads/sitename_cache.c | 132 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 source3/libads/sitename_cache.c

(limited to 'source3/libads/sitename_cache.c')

diff --git a/source3/libads/sitename_cache.c b/source3/libads/sitename_cache.c
new file mode 100644
index 0000000..4bf2ca7
--- /dev/null
+++ b/source3/libads/sitename_cache.c
@@ -0,0 +1,132 @@
+/*
+   Unix SMB/CIFS implementation.
+   DNS utility library
+   Copyright (C) Gerald (Jerry) Carter           2006.
+   Copyright (C) Jeremy Allison                  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 "libads/sitename_cache.h"
+#include "lib/gencache.h"
+
+/****************************************************************************
+ Store and fetch the AD client sitename.
+****************************************************************************/
+
+#define SITENAME_KEY	"AD_SITENAME/DOMAIN/%s"
+
+static char *sitename_key(TALLOC_CTX *mem_ctx, const char *realm)
+{
+	char *keystr = talloc_asprintf_strupper_m(
+		mem_ctx, SITENAME_KEY, realm);
+	return keystr;
+}
+
+
+/****************************************************************************
+ Store the AD client sitename.
+ We store indefinitely as every new CLDAP query will re-write this.
+****************************************************************************/
+
+bool sitename_store(const char *realm, const char *sitename)
+{
+	time_t expire;
+	bool ret = False;
+	char *key;
+
+	if (!realm || (strlen(realm) == 0)) {
+		DEBUG(0,("sitename_store: no realm\n"));
+		return False;
+	}
+
+	key = sitename_key(talloc_tos(), realm);
+
+	if (!sitename || (sitename && !*sitename)) {
+		DEBUG(5,("sitename_store: deleting empty sitename!\n"));
+		ret = gencache_del(key);
+		TALLOC_FREE(key);
+		return ret;
+	}
+
+	expire = get_time_t_max(); /* Store indefinitely. */
+
+	DEBUG(10,("sitename_store: realm = [%s], sitename = [%s], expire = [%u]\n",
+		realm, sitename, (unsigned int)expire ));
+
+	ret = gencache_set( key, sitename, expire );
+	TALLOC_FREE(key);
+	return ret;
+}
+
+/****************************************************************************
+ Fetch the AD client sitename.
+ Caller must free.
+****************************************************************************/
+
+char *sitename_fetch(TALLOC_CTX *mem_ctx, const char *realm)
+{
+	char *sitename = NULL;
+	time_t timeout;
+	bool ret = False;
+	const char *query_realm;
+	char *key;
+
+	if (!realm || (strlen(realm) == 0)) {
+		query_realm = lp_realm();
+	} else {
+		query_realm = realm;
+	}
+
+	key = sitename_key(talloc_tos(), query_realm);
+
+	ret = gencache_get( key, mem_ctx, &sitename, &timeout );
+	TALLOC_FREE(key);
+	if ( !ret ) {
+		DBG_INFO("No stored sitename for realm '%s'\n", query_realm);
+	} else {
+		DBG_INFO("Returning sitename for realm '%s': \"%s\"\n",
+			 query_realm, sitename);
+	}
+	return sitename;
+}
+
+/****************************************************************************
+ Did the sitename change ?
+****************************************************************************/
+
+bool stored_sitename_changed(const char *realm, const char *sitename)
+{
+	bool ret = False;
+
+	char *new_sitename;
+
+	if (!realm || (strlen(realm) == 0)) {
+		DEBUG(0,("stored_sitename_changed: no realm\n"));
+		return False;
+	}
+
+	new_sitename = sitename_fetch(talloc_tos(), realm);
+
+	if (sitename && new_sitename && !strequal(sitename, new_sitename)) {
+		ret = True;
+	} else if ((sitename && !new_sitename) ||
+			(!sitename && new_sitename)) {
+		ret = True;
+	}
+	TALLOC_FREE(new_sitename);
+	return ret;
+}
+
-- 
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