Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

9 files changed, 3240 insertions, 0 deletions

diff --git a/source4/nbt_server/wins/wins_dns_proxy.c b/source4/nbt_server/wins/wins_dns_proxy.c
new file mode 100644
index 0000000..95ceb21
--- /dev/null
+++ b/source4/nbt_server/wins/wins_dns_proxy.c
@@ -0,0 +1,99 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   wins server dns proxy
+
+   Copyright (C) Stefan Metzmacher	2005
+      
+   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 "nbt_server/nbt_server.h"
+#include "nbt_server/wins/winsdb.h"
+#include "nbt_server/wins/winsserver.h"
+#include "system/time.h"
+#include "libcli/composite/composite.h"
+#include "samba/service_task.h"
+#include "libcli/resolve/resolve.h"
+#include "lib/socket/socket.h"
+
+struct wins_dns_proxy_state {
+	struct nbt_name_socket *nbtsock;
+	struct nbt_name_packet *packet;
+	struct socket_address *src;
+};
+
+static void nbtd_wins_dns_proxy_handler(struct composite_context *creq)
+{
+	NTSTATUS status;
+	struct wins_dns_proxy_state *s = talloc_get_type(creq->async.private_data,
+							 struct wins_dns_proxy_state);
+	struct nbt_name *name = &s->packet->questions[0].name;
+	const char *address;
+	const char **addresses;
+	uint16_t nb_flags = 0; /* TODO: ... */
+
+	status = resolve_name_recv(creq, s->packet, &address);
+	if (!NT_STATUS_IS_OK(status)) {
+		goto notfound;
+	}
+
+	addresses = str_list_add(NULL, address);
+	talloc_steal(s->packet, addresses);
+	if (!addresses) goto notfound;
+
+	nbtd_name_query_reply(s->nbtsock, s->packet, s->src, name, 
+			      0, nb_flags, addresses);
+	return;
+notfound:
+	nbtd_negative_name_query_reply(s->nbtsock, s->packet, s->src);
+}
+
+/*
+  dns proxy query a name
+*/
+void nbtd_wins_dns_proxy_query(struct nbt_name_socket *nbtsock, 
+			       struct nbt_name_packet *packet, 
+			       struct socket_address *src)
+{
+	struct nbt_name *name = &packet->questions[0].name;
+	struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
+						       struct nbtd_interface);
+	struct wins_dns_proxy_state *s;
+	struct composite_context *creq;
+	struct resolve_context *resolve_ctx;
+
+	s = talloc(nbtsock, struct wins_dns_proxy_state);
+	if (!s) goto failed;
+	s->nbtsock	= nbtsock;
+	s->packet	= talloc_steal(s, packet);
+	s->src		= socket_address_copy(s, src);
+	if (s->src == NULL) {
+		goto failed;
+	}
+
+	resolve_ctx = resolve_context_init(s);
+	if (resolve_ctx == NULL) goto failed;
+	resolve_context_add_host_method(resolve_ctx);
+
+	creq = resolve_name_send(resolve_ctx, s, name, iface->nbtsrv->task->event_ctx);
+	if (!creq) goto failed;
+
+	creq->async.fn		= nbtd_wins_dns_proxy_handler;
+	creq->async.private_data= s;
+	return;
+failed:
+	nbtd_negative_name_query_reply(nbtsock, packet, src);
+}
diff --git a/source4/nbt_server/wins/wins_hook.c b/source4/nbt_server/wins/wins_hook.c
new file mode 100644
index 0000000..1af471b
--- /dev/null
+++ b/source4/nbt_server/wins/wins_hook.c
@@ -0,0 +1,94 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   wins hook feature, we run a specified script
+   which can then do some custom actions
+
+   Copyright (C) Stefan Metzmacher	2005
+      
+   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 "nbt_server/nbt_server.h"
+#include "nbt_server/wins/winsdb.h"
+#include "system/filesys.h"
+
+static const char *wins_hook_action_string(enum wins_hook_action action)
+{
+	switch (action) {
+	case WINS_HOOK_ADD:	return "add";
+	case WINS_HOOK_MODIFY:	return "refresh";
+	case WINS_HOOK_DELETE:	return "delete";
+	}
+
+	return "unknown";
+}
+
+void wins_hook(struct winsdb_handle *h, const struct winsdb_record *rec, 
+	       enum wins_hook_action action, const char *wins_hook_script)
+{
+	uint32_t i, length;
+	int child;
+	char *cmd = NULL;
+	TALLOC_CTX *tmp_mem = NULL;
+
+	if (!wins_hook_script || !wins_hook_script[0]) return;
+
+	tmp_mem = talloc_new(h);
+	if (!tmp_mem) goto failed;
+
+	length = winsdb_addr_list_length(rec->addresses);
+
+	if (action == WINS_HOOK_MODIFY && length < 1) {
+		action = WINS_HOOK_DELETE;
+	}
+
+	cmd = talloc_asprintf(tmp_mem,
+			      "%s %s %s %02x %ld",
+			      wins_hook_script,
+			      wins_hook_action_string(action),
+			      rec->name->name,
+			      rec->name->type,
+			      (long int) rec->expire_time);
+	if (!cmd) goto failed;
+
+	for (i=0; rec->addresses[i]; i++) {
+		cmd = talloc_asprintf_append_buffer(cmd, " %s", rec->addresses[i]->address);
+		if (!cmd) goto failed;
+	}
+
+	DEBUG(10,("call wins hook '%s'\n", cmd));
+
+	/* signal handling in posix really sucks - doing this in a library
+	   affects the whole app, but what else to do?? */
+	signal(SIGCHLD, SIG_IGN);
+
+	child = fork();
+	if (child == (pid_t)-1) {
+		goto failed;
+	}
+
+	if (child == 0) {
+/* TODO: close file handles */
+		execl("/bin/sh", "sh", "-c", cmd, NULL);
+		_exit(0);
+	}
+
+	talloc_free(tmp_mem);
+	return;
+failed:
+	talloc_free(tmp_mem);
+	DEBUG(0,("FAILED: calling wins hook '%s'\n", wins_hook_script));
+}
diff --git a/source4/nbt_server/wins/wins_ldb.c b/source4/nbt_server/wins/wins_ldb.c
new file mode 100644
index 0000000..304c98d
--- /dev/null
+++ b/source4/nbt_server/wins/wins_ldb.c
@@ -0,0 +1,127 @@
+/* 
+   ldb database module
+
+   Copyright (C) Stefan Metzmacher 2006
+
+   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/>.
+*/
+
+/*
+ *  Name: ldb
+ *
+ *  Component: ldb winsdb module
+ *
+ *  Description: verify winsdb records before they're written to disk
+ *
+ *  Author: Stefan Metzmacher
+ */
+
+#include "includes.h"
+#include "lib/events/events.h"
+#include "nbt_server/nbt_server.h"
+#include "nbt_server/wins/winsdb.h"
+#include <ldb_module.h>
+#include "system/network.h"
+#include "lib/socket/netif.h"
+#include "param/param.h"
+
+static int wins_ldb_verify(struct ldb_module *module, struct ldb_request *req)
+{
+	struct ldb_context *ldb = ldb_module_get_ctx(module);
+	struct winsdb_handle *h = talloc_get_type(ldb_get_opaque(ldb, "winsdb_handle"),
+						  struct winsdb_handle);
+	const struct ldb_message *msg;
+
+	switch (req->operation) {
+	case LDB_ADD:
+		msg = req->op.add.message;
+		break;
+		
+	case LDB_MODIFY:
+		msg = req->op.mod.message;
+		break;
+
+	default:
+		return ldb_next_request(module, req);
+	}
+
+	/* do not manipulate our control entries */
+	if (ldb_dn_is_special(msg->dn)) {
+		return ldb_next_request(module, req);
+	}
+
+	if (!h) {
+		ldb_debug_set(ldb, LDB_DEBUG_FATAL, "%s", "WINS_LDB: INTERNAL ERROR: no winsdb_handle present!");
+		return LDB_ERR_OTHER;
+	}
+
+	switch (h->caller) {
+	case WINSDB_HANDLE_CALLER_NBTD:
+	case WINSDB_HANDLE_CALLER_WREPL:
+		/* we trust our nbt and wrepl code ... */
+		return ldb_next_request(module, req);
+
+	case WINSDB_HANDLE_CALLER_ADMIN:
+		ldb_debug(ldb, LDB_DEBUG_WARNING, "%s\n", "WINS_LDB: TODO verify add/modify for WINSDB_HANDLE_CALLER_ADMIN");
+		return ldb_next_request(module, req);
+	}
+
+	return LDB_ERR_OTHER;
+}
+
+static int wins_ldb_init(struct ldb_module *module)
+{
+	struct ldb_context *ldb = ldb_module_get_ctx(module);
+	struct winsdb_handle *h;
+	const char *owner;
+	struct loadparm_context *lp_ctx = ldb_get_opaque(ldb, "loadparm");
+
+	ldb_module_set_private(module, NULL);
+
+	owner = lpcfg_parm_string(lp_ctx, NULL, "winsdb", "local_owner");
+	if (!owner) {
+		struct interface *ifaces;
+		load_interface_list(module, lp_ctx, &ifaces);
+		owner = iface_list_first_v4(ifaces);
+		if (!owner) {
+			owner = "0.0.0.0";
+		}
+	}
+
+	h = talloc_zero(module, struct winsdb_handle);
+	if (!h) goto failed;
+	h->ldb		= ldb;
+	h->caller	= WINSDB_HANDLE_CALLER_ADMIN;
+	h->local_owner	= talloc_strdup(h, owner);
+	if (!h->local_owner) goto failed;
+
+	return ldb_set_opaque(ldb, "winsdb_handle", h);
+
+failed:
+	talloc_free(h);
+	return LDB_ERR_OTHER;
+}
+
+static const struct ldb_module_ops ldb_wins_ldb_module_ops = {
+	.name          = "wins_ldb",
+	.add           = wins_ldb_verify,
+	.modify        = wins_ldb_verify,
+	.init_context  = wins_ldb_init
+};
+
+int ldb_wins_ldb_module_init(const char *version)
+{
+	LDB_MODULE_CHECK_VERSION(version);
+	return ldb_register_module(&ldb_wins_ldb_module_ops);
+}
diff --git a/source4/nbt_server/wins/winsclient.c b/source4/nbt_server/wins/winsclient.c
new file mode 100644
index 0000000..c1e7f9a
--- /dev/null
+++ b/source4/nbt_server/wins/winsclient.c
@@ -0,0 +1,284 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   wins client name registration and refresh
+
+   Copyright (C) Andrew Tridgell	2005
+   
+   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 "nbt_server/nbt_server.h"
+#include "nbt_server/wins/winsserver.h"
+#include "libcli/composite/composite.h"
+#include "lib/events/events.h"
+#include "librpc/gen_ndr/ndr_nbt.h"
+#include "samba/service_task.h"
+#include "param/param.h"
+
+/* we send WINS client requests using our primary network interface 
+*/
+static struct nbt_name_socket *wins_socket(struct nbtd_interface *iface)
+{
+	struct nbtd_server *nbtsrv = iface->nbtsrv;
+	return nbtsrv->interfaces->nbtsock;
+}
+
+
+static void nbtd_wins_refresh(struct tevent_context *ev, struct tevent_timer *te,
+			      struct timeval t, void *private_data);
+
+/*
+  retry a WINS name registration
+*/
+static void nbtd_wins_register_retry(struct tevent_context *ev, struct tevent_timer *te,
+				     struct timeval t, void *private_data)
+{
+	struct nbtd_iface_name *iname = talloc_get_type(private_data, struct nbtd_iface_name);
+	nbtd_winsclient_register(iname);
+}
+
+/*
+  start a timer to refresh this name
+*/
+static void nbtd_wins_start_refresh_timer(struct nbtd_iface_name *iname)
+{
+	uint32_t refresh_time;
+	uint32_t max_refresh_time = lpcfg_parm_int(iname->iface->nbtsrv->task->lp_ctx, NULL, "nbtd", "max_refresh_time", 7200);
+
+	refresh_time = MIN(max_refresh_time, iname->ttl/2);
+	
+	tevent_add_timer(iname->iface->nbtsrv->task->event_ctx,
+			iname, 
+			timeval_add(&iname->registration_time, refresh_time, 0),
+			nbtd_wins_refresh, iname);
+}
+
+struct nbtd_wins_refresh_state {
+	struct nbtd_iface_name *iname;
+	struct nbt_name_refresh_wins io;
+};
+
+/*
+  called when a wins name refresh has completed
+*/
+static void nbtd_wins_refresh_handler(struct tevent_req *subreq)
+{
+	NTSTATUS status;
+	struct nbtd_wins_refresh_state *state =
+		tevent_req_callback_data(subreq,
+		struct nbtd_wins_refresh_state);
+	struct nbtd_iface_name *iname = state->iname;
+
+	status = nbt_name_refresh_wins_recv(subreq, state, &state->io);
+	TALLOC_FREE(subreq);
+	if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
+		/* our WINS server is dead - start registration over
+		   from scratch */
+		DEBUG(2,("Failed to refresh %s with WINS server %s\n",
+			 nbt_name_string(state, &iname->name), iname->wins_server));
+		talloc_free(state);
+		nbtd_winsclient_register(iname);
+		return;
+	}
+
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(1,("Name refresh failure with WINS for %s - %s\n", 
+			 nbt_name_string(state, &iname->name), nt_errstr(status)));
+		talloc_free(state);
+		return;
+	}
+
+	if (state->io.out.rcode != 0) {
+		DEBUG(1,("WINS server %s rejected name refresh of %s - %s\n", 
+			 state->io.out.wins_server,
+			 nbt_name_string(state, &iname->name),
+			 nt_errstr(nbt_rcode_to_ntstatus(state->io.out.rcode))));
+		iname->nb_flags |= NBT_NM_CONFLICT;
+		talloc_free(state);
+		return;
+	}	
+
+	DEBUG(4,("Refreshed name %s with WINS server %s\n",
+		 nbt_name_string(state, &iname->name), iname->wins_server));
+	/* success - start a periodic name refresh */
+	iname->nb_flags |= NBT_NM_ACTIVE;
+	if (iname->wins_server) {
+		/*
+		 * talloc_free() would generate a warning,
+		 * so steal it into the tmp context
+		 */
+		talloc_steal(state, iname->wins_server);
+	}
+	iname->wins_server = talloc_move(iname, &state->io.out.wins_server);
+	iname->registration_time = timeval_current();
+
+	talloc_free(state);
+
+	nbtd_wins_start_refresh_timer(iname);
+}
+
+
+/*
+  refresh a WINS name registration
+*/
+static void nbtd_wins_refresh(struct tevent_context *ev, struct tevent_timer *te,
+			      struct timeval t, void *private_data)
+{
+	struct nbtd_iface_name *iname = talloc_get_type(private_data, struct nbtd_iface_name);
+	struct nbtd_interface *iface = iname->iface;
+	struct nbt_name_socket *nbtsock = wins_socket(iface);
+	struct tevent_req *subreq;
+	struct nbtd_wins_refresh_state *state;
+	char **l;
+
+	state = talloc_zero(iname, struct nbtd_wins_refresh_state);
+	if (state == NULL) {
+		return;
+	}
+
+	state->iname = iname;
+
+	/* setup a wins name refresh request */
+	state->io.in.name            = iname->name;
+	l = str_list_make_single(state, iname->wins_server);
+	state->io.in.wins_servers    = discard_const_p(const char *, l);
+	state->io.in.wins_port       = lpcfg_nbt_port(iface->nbtsrv->task->lp_ctx);
+	state->io.in.addresses       = nbtd_address_list(iface, state);
+	state->io.in.nb_flags        = iname->nb_flags;
+	state->io.in.ttl             = iname->ttl;
+
+	if (!state->io.in.addresses) {
+		talloc_free(state);
+		return;
+	}
+
+	subreq = nbt_name_refresh_wins_send(state, ev, nbtsock, &state->io);
+	if (subreq == NULL) {
+		talloc_free(state);
+		return;
+	}
+
+	tevent_req_set_callback(subreq, nbtd_wins_refresh_handler, state);
+}
+
+struct nbtd_wins_register_state {
+	struct nbtd_iface_name *iname;
+	struct nbt_name_register_wins io;
+};
+
+/*
+  called when a wins name register has completed
+*/
+static void nbtd_wins_register_handler(struct tevent_req *subreq)
+{
+	NTSTATUS status;
+	struct nbtd_wins_register_state *state =
+		tevent_req_callback_data(subreq,
+		struct nbtd_wins_register_state);
+	struct nbtd_iface_name *iname = state->iname;
+
+	status = nbt_name_register_wins_recv(subreq, state, &state->io);
+	TALLOC_FREE(subreq);
+	if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
+		/* none of the WINS servers responded - try again 
+		   periodically */
+		int wins_retry_time = lpcfg_parm_int(iname->iface->nbtsrv->task->lp_ctx, NULL, "nbtd", "wins_retry", 300);
+		tevent_add_timer(iname->iface->nbtsrv->task->event_ctx,
+				iname,
+				timeval_current_ofs(wins_retry_time, 0),
+				nbtd_wins_register_retry,
+				iname);
+		talloc_free(state);
+		return;
+	}
+
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(1,("Name register failure with WINS for %s - %s\n", 
+			 nbt_name_string(state, &iname->name), nt_errstr(status)));
+		talloc_free(state);
+		return;
+	}	
+
+	if (state->io.out.rcode != 0) {
+		DEBUG(1,("WINS server %s rejected name register of %s - %s\n", 
+			 state->io.out.wins_server,
+			 nbt_name_string(state, &iname->name),
+			 nt_errstr(nbt_rcode_to_ntstatus(state->io.out.rcode))));
+		iname->nb_flags |= NBT_NM_CONFLICT;
+		talloc_free(state);
+		return;
+	}	
+
+	/* success - start a periodic name refresh */
+	iname->nb_flags |= NBT_NM_ACTIVE;
+	if (iname->wins_server) {
+		/*
+		 * talloc_free() would generate a warning,
+		 * so steal it into the tmp context
+		 */
+		talloc_steal(state, iname->wins_server);
+	}
+	iname->wins_server = talloc_move(iname, &state->io.out.wins_server);
+
+	iname->registration_time = timeval_current();
+
+	DEBUG(3,("Registered %s with WINS server %s\n",
+		 nbt_name_string(state, &iname->name), iname->wins_server));
+
+	talloc_free(state);
+
+	nbtd_wins_start_refresh_timer(iname);
+}
+
+/*
+  register a name with our WINS servers
+*/
+void nbtd_winsclient_register(struct nbtd_iface_name *iname)
+{
+	struct nbtd_interface *iface = iname->iface;
+	struct nbt_name_socket *nbtsock = wins_socket(iface);
+	struct nbtd_wins_register_state *state;
+	struct tevent_req *subreq;
+
+	state = talloc_zero(iname, struct nbtd_wins_register_state);
+	if (state == NULL) {
+		return;
+	}
+
+	state->iname = iname;
+
+	/* setup a wins name register request */
+	state->io.in.name         = iname->name;
+	state->io.in.wins_port    = lpcfg_nbt_port(iface->nbtsrv->task->lp_ctx);
+	state->io.in.wins_servers = lpcfg_wins_server_list(iface->nbtsrv->task->lp_ctx);
+	state->io.in.addresses    = nbtd_address_list(iface, state);
+	state->io.in.nb_flags     = iname->nb_flags;
+	state->io.in.ttl          = iname->ttl;
+
+	if (state->io.in.addresses == NULL) {
+		talloc_free(state);
+		return;
+	}
+
+	subreq = nbt_name_register_wins_send(state, iface->nbtsrv->task->event_ctx,
+					     nbtsock, &state->io);
+	if (subreq == NULL) {
+		talloc_free(state);
+		return;
+	}
+
+	tevent_req_set_callback(subreq, nbtd_wins_register_handler, state);
+}
diff --git a/source4/nbt_server/wins/winsdb.c b/source4/nbt_server/wins/winsdb.c
new file mode 100644
index 0000000..2a05e96
--- /dev/null
+++ b/source4/nbt_server/wins/winsdb.c
@@ -0,0 +1,1027 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   WINS database routines
+
+   Copyright (C) Andrew Tridgell	2005
+   Copyright (C) Stefan Metzmacher	2005
+      
+   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 "nbt_server/nbt_server.h"
+#include "nbt_server/wins/winsdb.h"
+#include <ldb.h>
+#include <ldb_errors.h>
+#include "librpc/gen_ndr/ndr_nbt.h"
+#include "system/time.h"
+#include "ldb_wrap.h"
+#include "system/network.h"
+#include "lib/socket/netif.h"
+#include "param/param.h"
+#include "lib/util/smb_strtox.h"
+
+#undef strcasecmp
+
+uint64_t winsdb_get_maxVersion(struct winsdb_handle *h)
+{
+	int ret;
+	struct ldb_context *ldb = h->ldb;
+	struct ldb_dn *dn;
+	struct ldb_result *res = NULL;
+	TALLOC_CTX *tmp_ctx = talloc_new(ldb);
+	uint64_t maxVersion = 0;
+
+	dn = ldb_dn_new(tmp_ctx, ldb, "CN=VERSION");
+	if (!dn) goto failed;
+
+	/* find the record in the WINS database */
+	ret = ldb_search(ldb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, NULL, NULL);
+	if (ret != LDB_SUCCESS) goto failed;
+	if (res->count > 1) goto failed;
+
+	if (res->count == 1) {
+		maxVersion = ldb_msg_find_attr_as_uint64(res->msgs[0], "maxVersion", 0);
+	}
+
+failed:
+	talloc_free(tmp_ctx);
+	return maxVersion;
+}
+
+/*
+ if newVersion == 0 return the old maxVersion + 1 and save it
+ if newVersion > 0 return MAX(oldMaxVersion, newMaxVersion) and save it
+*/
+uint64_t winsdb_set_maxVersion(struct winsdb_handle *h, uint64_t newMaxVersion)
+{
+	int trans;
+	int ret;
+	struct ldb_dn *dn;
+	struct ldb_result *res = NULL;
+	struct ldb_message *msg = NULL;
+	struct ldb_context *wins_db = h->ldb;
+	TALLOC_CTX *tmp_ctx = talloc_new(wins_db);
+	uint64_t oldMaxVersion = 0;
+
+	trans = ldb_transaction_start(wins_db);
+	if (trans != LDB_SUCCESS) goto failed;
+
+	dn = ldb_dn_new(tmp_ctx, wins_db, "CN=VERSION");
+	if (!dn) goto failed;
+
+	/* find the record in the WINS database */
+	ret = ldb_search(wins_db, tmp_ctx, &res, dn, LDB_SCOPE_BASE, NULL, NULL);
+	if (ret != LDB_SUCCESS) goto failed;
+	if (res->count > 1) goto failed;
+
+	if (res->count == 1) {
+		oldMaxVersion = ldb_msg_find_attr_as_uint64(res->msgs[0], "maxVersion", 0);
+	}
+
+	if (newMaxVersion == 0) {
+		newMaxVersion = oldMaxVersion + 1;
+	} else {
+		newMaxVersion = MAX(oldMaxVersion, newMaxVersion);
+	}
+
+	msg = ldb_msg_new(tmp_ctx);
+	if (!msg) goto failed;
+	msg->dn = dn;
+
+
+	ret = ldb_msg_append_string(msg, "objectClass", "winsMaxVersion",
+				    LDB_FLAG_MOD_REPLACE);
+	if (ret != LDB_SUCCESS) goto failed;
+	ret = ldb_msg_append_fmt(msg, LDB_FLAG_MOD_REPLACE,
+				 "maxVersion", "%llu", (long long)newMaxVersion);
+	if (ret != LDB_SUCCESS) goto failed;
+
+	ret = ldb_modify(wins_db, msg);
+	if (ret != LDB_SUCCESS) ret = ldb_add(wins_db, msg);
+	if (ret != LDB_SUCCESS) goto failed;
+
+	trans = ldb_transaction_commit(wins_db);
+	if (trans != LDB_SUCCESS) goto failed;
+
+	talloc_free(tmp_ctx);
+	return newMaxVersion;
+
+failed:
+	if (trans == LDB_SUCCESS) ldb_transaction_cancel(wins_db);
+	talloc_free(tmp_ctx);
+	return 0;
+}
+
+/*
+  return a DN for a nbt_name
+*/
+static struct ldb_dn *winsdb_dn(TALLOC_CTX *mem_ctx, struct ldb_context *ldb,
+				const struct nbt_name *name)
+{
+	struct ldb_dn *dn;
+
+	dn = ldb_dn_new_fmt(mem_ctx, ldb, "type=0x%02X", name->type);
+	if (ldb_dn_is_valid(dn) && name->name && *name->name) {
+		ldb_dn_add_child_fmt(dn, "name=%s", name->name);
+	}
+	if (ldb_dn_is_valid(dn) && name->scope && *name->scope) {
+		ldb_dn_add_child_fmt(dn, "scope=%s", name->scope);
+	}
+	return dn;
+}
+
+static NTSTATUS winsdb_nbt_name(TALLOC_CTX *mem_ctx, struct ldb_dn *dn, struct nbt_name **_name)
+{
+	NTSTATUS status;
+	struct nbt_name *name;
+	unsigned int comp_num;
+	uint32_t cur = 0;
+	int error = 0;
+
+	name = talloc(mem_ctx, struct nbt_name);
+	if (!name) {
+		status = NT_STATUS_NO_MEMORY;
+		goto failed;
+	}
+
+	comp_num = ldb_dn_get_comp_num(dn);
+
+	if (comp_num > 3) {
+		status = NT_STATUS_INTERNAL_DB_CORRUPTION;
+		goto failed;
+	}
+
+	if (comp_num > cur && strcasecmp("scope", ldb_dn_get_component_name(dn, cur)) == 0) {
+		name->scope	= (const char *)talloc_strdup(name, (char *)ldb_dn_get_component_val(dn, cur)->data);
+		cur++;
+	} else {
+		name->scope	= NULL;
+	}
+
+	if (comp_num > cur && strcasecmp("name", ldb_dn_get_component_name(dn, cur)) == 0) {
+		name->name	= (const char *)talloc_strdup(name, (char *)ldb_dn_get_component_val(dn, cur)->data);
+		cur++;
+	} else {
+		name->name	= talloc_strdup(name, "");
+		if (!name->name) {
+			status = NT_STATUS_NO_MEMORY;
+			goto failed;
+		}
+	}
+
+	if (comp_num > cur && strcasecmp("type", ldb_dn_get_component_name(dn, cur)) == 0) {
+		name->type =
+			smb_strtoul(
+				(char *)ldb_dn_get_component_val(dn, cur)->data,
+				NULL,
+				0,
+				&error,
+				SMB_STR_STANDARD);
+		if (error != 0) {
+			status = NT_STATUS_INTERNAL_DB_CORRUPTION;
+			goto failed;
+		}
+		cur++;
+	} else {
+		status = NT_STATUS_INTERNAL_DB_CORRUPTION;
+		goto failed;
+	}
+
+	*_name = name;
+	return NT_STATUS_OK;
+failed:
+	talloc_free(name);
+	return status;
+}
+
+/*
+ decode the winsdb_addr("address") attribute:
+ "172.31.1.1" or 
+ "172.31.1.1;winsOwner:172.31.9.202;expireTime:20050923032330.0Z;"
+ are valid records
+*/
+static NTSTATUS winsdb_addr_decode(struct winsdb_handle *h, struct winsdb_record *rec, struct ldb_val *val,
+				   TALLOC_CTX *mem_ctx, struct winsdb_addr **_addr)
+{
+	NTSTATUS status;
+	struct winsdb_addr *addr;
+	const char *address;
+	const char *wins_owner;
+	const char *expire_time;
+	char *p;
+
+	addr = talloc(mem_ctx, struct winsdb_addr);
+	if (!addr) {
+		status = NT_STATUS_NO_MEMORY;
+		goto failed;
+	}
+
+	address = (char *)val->data;
+
+	p = strchr(address, ';');
+	if (!p) {
+		/* support old entries, with only the address */
+		addr->address		= (const char *)talloc_steal(addr, val->data);
+		addr->wins_owner	= talloc_strdup(addr, rec->wins_owner);
+		if (!addr->wins_owner) {
+			status = NT_STATUS_NO_MEMORY;
+			goto failed;
+		}
+		addr->expire_time	= rec->expire_time;
+		*_addr = addr;
+		return NT_STATUS_OK;
+	}
+
+	*p = '\0'; p++;
+	addr->address = talloc_strdup(addr, address);
+	if (!addr->address) {
+		status = NT_STATUS_NO_MEMORY;
+		goto failed;
+	}
+
+	if (strncmp("winsOwner:", p, 10) != 0) {
+		status = NT_STATUS_INTERNAL_DB_CORRUPTION;
+		goto failed;
+	}
+	wins_owner = p + 10;
+	p = strchr(wins_owner, ';');
+	if (!p) {
+		status = NT_STATUS_INTERNAL_DB_CORRUPTION;
+		goto failed;
+	}
+
+	*p = '\0';p++;
+	if (strcmp(wins_owner, "0.0.0.0") == 0) {
+		wins_owner = h->local_owner;
+	}
+	addr->wins_owner = talloc_strdup(addr, wins_owner);
+	if (!addr->wins_owner) {
+		status = NT_STATUS_NO_MEMORY;
+		goto failed;
+	}
+
+	if (strncmp("expireTime:", p, 11) != 0) {
+		status = NT_STATUS_INTERNAL_DB_CORRUPTION;
+		goto failed;
+	}
+
+	expire_time = p + 11;
+	p = strchr(expire_time, ';');
+	if (!p) {
+		status = NT_STATUS_INTERNAL_DB_CORRUPTION;
+		goto failed;
+	}
+
+	*p = '\0';p++;
+	addr->expire_time = ldb_string_to_time(expire_time);
+
+	*_addr = addr;
+	return NT_STATUS_OK;
+failed:
+	talloc_free(addr);
+	return status;
+}
+
+/*
+ encode the winsdb_addr("address") attribute like this:
+ non-static record:
+ "172.31.1.1;winsOwner:172.31.9.202;expireTime:20050923032330.0Z;"
+ static record:
+ "172.31.1.1"
+*/
+static int ldb_msg_add_winsdb_addr(struct ldb_message *msg, struct winsdb_record *rec,
+				   const char *attr_name, struct winsdb_addr *addr)
+{
+	const char *str;
+
+	if (rec->is_static) {
+		str = talloc_strdup(msg, addr->address);
+		if (!str) return LDB_ERR_OPERATIONS_ERROR;
+	} else {
+		char *expire_time;
+		expire_time = ldb_timestring(msg, addr->expire_time);
+		if (!expire_time) return LDB_ERR_OPERATIONS_ERROR;
+		str = talloc_asprintf(msg, "%s;winsOwner:%s;expireTime:%s;",
+				      addr->address, addr->wins_owner,
+				      expire_time);
+		talloc_free(expire_time);
+		if (!str) return LDB_ERR_OPERATIONS_ERROR;
+	}
+
+	return ldb_msg_add_string(msg, attr_name, str);
+}
+
+struct winsdb_addr **winsdb_addr_list_make(TALLOC_CTX *mem_ctx)
+{
+	struct winsdb_addr **addresses;
+
+	addresses = talloc_array(mem_ctx, struct winsdb_addr *, 1);
+	if (!addresses) return NULL;
+
+	addresses[0] = NULL;
+
+	return addresses;
+}
+
+static int winsdb_addr_sort_list (struct winsdb_addr **p1, struct winsdb_addr **p2, void *opaque)
+{
+	struct winsdb_addr *a1 = talloc_get_type(*p1, struct winsdb_addr);
+	struct winsdb_addr *a2 = talloc_get_type(*p2, struct winsdb_addr);
+	struct winsdb_handle *h= talloc_get_type(opaque, struct winsdb_handle);
+	bool a1_owned = false;
+	bool a2_owned = false;
+
+	/*
+	 * first the owned addresses with the newest to the oldest address
+	 * then the replica addresses with the newest to the oldest address
+	 */
+	if (a2->expire_time != a1->expire_time) {
+		return a2->expire_time - a1->expire_time;
+	}
+
+	if (strcmp(a2->wins_owner, h->local_owner) == 0) {
+		a2_owned = true;
+	}
+
+	if (strcmp(a1->wins_owner, h->local_owner) == 0) {
+		a1_owned = true;
+	}
+
+	return a2_owned - a1_owned;
+}
+
+struct winsdb_addr **winsdb_addr_list_add(struct winsdb_handle *h, const struct winsdb_record *rec,
+					  struct winsdb_addr **addresses, const char *address,
+					  const char *wins_owner, time_t expire_time,
+					  bool is_name_registration)
+{
+	struct winsdb_addr *old_addr = NULL;
+	size_t len = 0;
+	size_t i;
+	bool found_old_replica = false;
+
+	/*
+	 * count the addresses and maybe
+	 * find an old entry for the new address
+	 */
+	for (i=0; addresses[i]; i++) {
+		if (old_addr) continue;
+		if (strcmp(addresses[i]->address, address) == 0) {
+			old_addr = addresses[i];
+		}
+	}
+	len = i;
+
+	/*
+	 * the address is already there
+	 * and we can replace it
+	 */
+	if (old_addr) {
+		goto remove_old_addr;
+	}
+
+	/*
+	 * if we don't have 25 addresses already,
+	 * we can just add the new address
+	 */
+	if (len < 25) {
+		goto add_new_addr;
+	}
+
+	/*
+	 * if we haven't found the address,
+	 * and we have already have 25 addresses
+	 * if so then we need to do the following:
+	 * - if it isn't a name registration, then just ignore the new address
+	 * - if it is a name registration, then first search for 
+	 *   the oldest replica and if there's no replica address
+	 *   search the oldest owned address
+	 */
+	if (!is_name_registration) {
+		return addresses;
+	}
+
+	/*
+	 * find the oldest replica address, if there's no replica
+	 * record at all, find the oldest owned address
+	 */
+	for (i=0; addresses[i]; i++) {
+		bool cur_is_replica = false;
+		/* find out if the current address is a replica */
+		if (strcmp(addresses[i]->wins_owner, h->local_owner) != 0) {
+			cur_is_replica = true;
+		}
+
+		/*
+		 * if we already found a replica address and the current address
+		 * is not a replica, then skip it
+		 */
+		if (found_old_replica && !cur_is_replica) continue;
+
+		/*
+		 * if we found the first replica address, reset the address
+		 * that would be replaced
+		 */
+		if (!found_old_replica && cur_is_replica) {
+			found_old_replica = true;
+			old_addr = addresses[i];
+			continue;
+		}
+
+		/*
+		 * if the first address isn't a replica, just start with 
+		 * the first one
+		 */
+		if (!old_addr) {
+			old_addr = addresses[i];
+			continue;
+		}
+
+		/*
+		 * see if we find an older address
+		 */
+		if (addresses[i]->expire_time < old_addr->expire_time) {
+			old_addr = addresses[i];
+			continue;
+		}
+	}
+
+remove_old_addr:
+	winsdb_addr_list_remove(addresses, old_addr->address);
+	len --;
+
+add_new_addr:
+	addresses = talloc_realloc(addresses, addresses, struct winsdb_addr *, len + 2);
+	if (!addresses) return NULL;
+
+	addresses[len] = talloc(addresses, struct winsdb_addr);
+	if (!addresses[len]) {
+		talloc_free(addresses);
+		return NULL;
+	}
+
+	addresses[len]->address = talloc_strdup(addresses[len], address);
+	if (!addresses[len]->address) {
+		talloc_free(addresses);
+		return NULL;
+	}
+
+	addresses[len]->wins_owner = talloc_strdup(addresses[len], wins_owner);
+	if (!addresses[len]->wins_owner) {
+		talloc_free(addresses);
+		return NULL;
+	}
+
+	addresses[len]->expire_time = expire_time;
+
+	addresses[len+1] = NULL;
+
+	LDB_TYPESAFE_QSORT(addresses, len+1, h, winsdb_addr_sort_list);
+
+	return addresses;
+}
+
+void winsdb_addr_list_remove(struct winsdb_addr **addresses, const char *address)
+{
+	size_t i;
+
+	for (i=0; addresses[i]; i++) {
+		if (strcmp(addresses[i]->address, address) == 0) {
+			break;
+		}
+	}
+
+	for (; addresses[i]; i++) {
+		addresses[i] = addresses[i+1];
+	}
+
+	return;
+}
+
+struct winsdb_addr *winsdb_addr_list_check(struct winsdb_addr **addresses, const char *address)
+{
+	size_t i;
+
+	for (i=0; addresses[i]; i++) {
+		if (strcmp(addresses[i]->address, address) == 0) {
+			return addresses[i];
+		}
+	}
+
+	return NULL;
+}
+
+size_t winsdb_addr_list_length(struct winsdb_addr **addresses)
+{
+	size_t i;
+	for (i=0; addresses[i]; i++);
+	return i;
+}
+
+const char **winsdb_addr_string_list(TALLOC_CTX *mem_ctx, struct winsdb_addr **addresses)
+{
+	size_t len = winsdb_addr_list_length(addresses);
+	const char **str_list=NULL;
+	size_t i;
+
+	for (i=0; i < len; i++) {
+		str_list = str_list_add(str_list, addresses[i]->address);
+		if (!str_list[i]) {
+			return NULL;
+		}
+	}
+	talloc_steal(mem_ctx, str_list);
+	return str_list;
+}
+
+/*
+  load a WINS entry from the database
+*/
+NTSTATUS winsdb_lookup(struct winsdb_handle *h, 
+		       const struct nbt_name *name,
+		       TALLOC_CTX *mem_ctx,
+		       struct winsdb_record **_rec)
+{
+	NTSTATUS status;
+	struct ldb_result *res = NULL;
+	int ret;
+	struct winsdb_record *rec;
+	struct ldb_context *wins_db = h->ldb;
+	TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
+	time_t now = time(NULL);
+
+	/* find the record in the WINS database */
+	ret = ldb_search(wins_db, tmp_ctx, &res,
+			 winsdb_dn(tmp_ctx, wins_db, name),
+			 LDB_SCOPE_BASE, NULL, NULL);
+
+	if (ret != LDB_SUCCESS || res->count > 1) {
+		status = NT_STATUS_INTERNAL_DB_CORRUPTION;
+		goto failed;
+	} else if (res->count== 0) {
+		status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
+		goto failed;
+	}
+
+	status = winsdb_record(h, res->msgs[0], tmp_ctx, now, &rec);
+	if (!NT_STATUS_IS_OK(status)) goto failed;
+
+	talloc_steal(mem_ctx, rec);
+	talloc_free(tmp_ctx);
+	*_rec = rec;
+	return NT_STATUS_OK;
+
+failed:
+	talloc_free(tmp_ctx);
+	return status;
+}
+
+NTSTATUS winsdb_record(struct winsdb_handle *h, struct ldb_message *msg, TALLOC_CTX *mem_ctx, time_t now, struct winsdb_record **_rec)
+{
+	NTSTATUS status;
+	struct winsdb_record *rec;
+	struct ldb_message_element *el;
+	struct nbt_name *name;
+	uint32_t i, j, num_values;
+
+	rec = talloc(mem_ctx, struct winsdb_record);
+	if (rec == NULL) {
+		status = NT_STATUS_NO_MEMORY;
+		goto failed;
+	}
+
+	status = winsdb_nbt_name(rec, msg->dn, &name);
+	if (!NT_STATUS_IS_OK(status)) goto failed;
+
+	if (strlen(name->name) > 15) {
+		status = NT_STATUS_INTERNAL_DB_CORRUPTION;
+		goto failed;
+	}
+	if (name->scope && strlen(name->scope) > 238) {
+		status = NT_STATUS_INTERNAL_DB_CORRUPTION;
+		goto failed;
+	}
+
+	/* parse it into a more convenient winsdb_record structure */
+	rec->name		= name;
+	rec->type		= ldb_msg_find_attr_as_int(msg, "recordType", WREPL_TYPE_UNIQUE);
+	rec->state		= ldb_msg_find_attr_as_int(msg, "recordState", WREPL_STATE_RELEASED);
+	rec->node		= ldb_msg_find_attr_as_int(msg, "nodeType", WREPL_NODE_B);
+	rec->is_static		= ldb_msg_find_attr_as_int(msg, "isStatic", 0);
+	rec->expire_time	= ldb_string_to_time(ldb_msg_find_attr_as_string(msg, "expireTime", NULL));
+	rec->version		= ldb_msg_find_attr_as_uint64(msg, "versionID", 0);
+	rec->wins_owner		= ldb_msg_find_attr_as_string(msg, "winsOwner", NULL);
+	rec->registered_by	= ldb_msg_find_attr_as_string(msg, "registeredBy", NULL);
+	talloc_steal(rec, rec->wins_owner);
+	talloc_steal(rec, rec->registered_by);
+
+	if (!rec->wins_owner || strcmp(rec->wins_owner, "0.0.0.0") == 0) {
+		rec->wins_owner = h->local_owner;
+	}
+
+	el = ldb_msg_find_element(msg, "address");
+	if (el) {
+		num_values = el->num_values;
+	} else {
+		num_values = 0;
+	}
+
+	if (rec->type == WREPL_TYPE_UNIQUE || rec->type == WREPL_TYPE_GROUP) {
+		if (num_values != 1) {
+			status = NT_STATUS_INTERNAL_DB_CORRUPTION;
+			goto failed;
+		}
+	}
+	if (rec->state == WREPL_STATE_ACTIVE) {
+		if (num_values < 1) {
+			status = NT_STATUS_INTERNAL_DB_CORRUPTION;
+			goto failed;
+		}
+	}
+	if (num_values > 25) {
+		status = NT_STATUS_INTERNAL_DB_CORRUPTION;
+		goto failed;
+	}
+
+	rec->addresses     = talloc_array(rec, struct winsdb_addr *, num_values+1);
+	if (rec->addresses == NULL) {
+		status = NT_STATUS_NO_MEMORY;
+		goto failed;
+	}
+
+	for (i=0,j=0;i<num_values;i++) {
+		bool we_are_owner = false;
+
+		status = winsdb_addr_decode(h, rec, &el->values[i], rec->addresses, &rec->addresses[j]);
+		if (!NT_STATUS_IS_OK(status)) goto failed;
+
+		if (strcmp(rec->addresses[j]->wins_owner, h->local_owner) == 0) {
+			we_are_owner = true;
+		}
+
+		/*
+		 * the record isn't static and is active
+		 * then don't add the address if it's expired,
+		 * but only if we're the owner of the address
+		 *
+		 * This is important for SGROUP records,
+		 * because each server thinks he's the owner of the
+		 * record and the record isn't replicated on a
+		 * name_refresh. So addresses owned by another owner
+		 * could expire, but we still need to return them
+		 * (as windows does).
+		 */
+		if (!rec->is_static &&
+		    rec->addresses[j]->expire_time <= now &&
+		    rec->state == WREPL_STATE_ACTIVE &&
+		    we_are_owner) {
+			DEBUG(5,("WINS: expiring name addr %s of %s (expired at %s)\n", 
+				 rec->addresses[j]->address, nbt_name_string(rec->addresses[j], rec->name),
+				 timestring(rec->addresses[j], rec->addresses[j]->expire_time)));
+			talloc_free(rec->addresses[j]);
+			rec->addresses[j] = NULL;
+			continue;
+		}
+		j++;
+	}
+	rec->addresses[j] = NULL;
+	num_values = j;
+
+	if (rec->is_static && rec->state == WREPL_STATE_ACTIVE) {
+		rec->expire_time = get_time_t_max();
+		for (i=0;rec->addresses[i];i++) {
+			rec->addresses[i]->expire_time = rec->expire_time;
+		}
+	}
+
+	if (rec->state == WREPL_STATE_ACTIVE) {
+		if (num_values < 1) {
+			DEBUG(5,("WINS: expiring name %s (because it has no active addresses)\n", 
+				 nbt_name_string(mem_ctx, rec->name)));
+			rec->state = WREPL_STATE_RELEASED;
+		}
+	}
+
+	*_rec = rec;
+	return NT_STATUS_OK;
+failed:
+	if (NT_STATUS_EQUAL(NT_STATUS_INTERNAL_DB_CORRUPTION, status)) {
+		DEBUG(1,("winsdb_record: corrupted record: %s\n", ldb_dn_get_linearized(msg->dn)));
+	}
+	talloc_free(rec);
+	return status;
+}
+
+/*
+  form a ldb_message from a winsdb_record
+*/
+static struct ldb_message *winsdb_message(struct ldb_context *ldb,
+					  struct winsdb_record *rec,
+					  TALLOC_CTX *mem_ctx)
+{
+	int i, ret;
+	size_t addr_count;
+	const char *expire_time;
+	struct ldb_message *msg = ldb_msg_new(mem_ctx);
+	if (msg == NULL) goto failed;
+
+	/* make sure we don't put in corrupted records */
+	addr_count = winsdb_addr_list_length(rec->addresses);
+	if (rec->state == WREPL_STATE_ACTIVE && addr_count == 0) {
+		rec->state = WREPL_STATE_RELEASED;
+	}
+	if (rec->type == WREPL_TYPE_UNIQUE && addr_count > 1) {
+		rec->type = WREPL_TYPE_MHOMED;
+	}
+
+	expire_time = ldb_timestring(msg, rec->expire_time);
+	if (!expire_time) {
+		goto failed;
+	}
+
+	msg->dn = winsdb_dn(msg, ldb, rec->name);
+	if (msg->dn == NULL) goto failed;
+	ret = ldb_msg_add_fmt(msg, "type", "0x%02X", rec->name->type);
+	if (rec->name->name && *rec->name->name) {
+		ret |= ldb_msg_add_string(msg, "name", rec->name->name);
+	}
+	if (rec->name->scope && *rec->name->scope) {
+		ret |= ldb_msg_add_string(msg, "scope", rec->name->scope);
+	}
+	ret |= ldb_msg_add_fmt(msg, "objectClass", "winsRecord");
+	ret |= ldb_msg_add_fmt(msg, "recordType", "%u", rec->type);
+	ret |= ldb_msg_add_fmt(msg, "recordState", "%u", rec->state);
+	ret |= ldb_msg_add_fmt(msg, "nodeType", "%u", rec->node);
+	ret |= ldb_msg_add_fmt(msg, "isStatic", "%u", rec->is_static);
+	ret |= ldb_msg_add_empty(msg, "expireTime", 0, NULL);
+	if (!(rec->is_static && rec->state == WREPL_STATE_ACTIVE)) {
+		ret |= ldb_msg_add_string(msg, "expireTime", expire_time);
+	}
+	ret |= ldb_msg_add_fmt(msg, "versionID", "%llu", (long long)rec->version);
+	ret |= ldb_msg_add_string(msg, "winsOwner", rec->wins_owner);
+	ret |= ldb_msg_add_empty(msg, "address", 0, NULL);
+	for (i=0;rec->addresses[i];i++) {
+		ret |= ldb_msg_add_winsdb_addr(msg, rec, "address", rec->addresses[i]);
+	}
+	if (rec->registered_by) {
+		ret |= ldb_msg_append_string(msg, "registeredBy", rec->registered_by, 0);
+	}
+	if (ret != LDB_SUCCESS) goto failed;
+	return msg;
+
+failed:
+	talloc_free(msg);
+	return NULL;
+}
+
+/*
+  save a WINS record into the database
+*/
+uint8_t winsdb_add(struct winsdb_handle *h, struct winsdb_record *rec, uint32_t flags)
+{
+	struct ldb_message *msg;
+	struct ldb_context *wins_db = h->ldb;
+	TALLOC_CTX *tmp_ctx = talloc_new(wins_db);
+	int trans = -1;
+	int ret;
+
+	trans = ldb_transaction_start(wins_db);
+	if (trans != LDB_SUCCESS) goto failed;
+
+	if (flags & WINSDB_FLAG_ALLOC_VERSION) {
+		/* passing '0' means auto-allocate a new one */
+		rec->version = winsdb_set_maxVersion(h, 0);
+		if (rec->version == 0) goto failed;
+	}
+	if (flags & WINSDB_FLAG_TAKE_OWNERSHIP) {
+		rec->wins_owner = h->local_owner;
+	}
+
+	msg = winsdb_message(wins_db, rec, tmp_ctx);
+	if (msg == NULL) goto failed;
+	ret = ldb_add(wins_db, msg);
+	if (ret != LDB_SUCCESS) goto failed;
+
+	trans = ldb_transaction_commit(wins_db);
+	if (trans != LDB_SUCCESS) goto failed;
+
+	wins_hook(h, rec, WINS_HOOK_ADD, h->hook_script);
+
+	talloc_free(tmp_ctx);
+	return NBT_RCODE_OK;
+
+failed:
+	if (trans == LDB_SUCCESS) ldb_transaction_cancel(wins_db);
+	talloc_free(tmp_ctx);
+	return NBT_RCODE_SVR;
+}
+
+
+/*
+  modify a WINS record in the database
+*/
+uint8_t winsdb_modify(struct winsdb_handle *h, struct winsdb_record *rec, uint32_t flags)
+{
+	struct ldb_message *msg;
+	struct ldb_context *wins_db = h->ldb;
+	TALLOC_CTX *tmp_ctx = talloc_new(wins_db);
+	int trans;
+	int ret;
+	unsigned int i;
+
+	trans = ldb_transaction_start(wins_db);
+	if (trans != LDB_SUCCESS) goto failed;
+
+	if (flags & WINSDB_FLAG_ALLOC_VERSION) {
+		/* passing '0' means auto-allocate a new one */
+		rec->version = winsdb_set_maxVersion(h, 0);
+		if (rec->version == 0) goto failed;
+	}
+	if (flags & WINSDB_FLAG_TAKE_OWNERSHIP) {
+		rec->wins_owner = h->local_owner;
+	}
+
+	msg = winsdb_message(wins_db, rec, tmp_ctx);
+	if (msg == NULL) goto failed;
+
+	for (i=0;i<msg->num_elements;i++) {
+		msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
+	}
+
+	ret = ldb_modify(wins_db, msg);
+	if (ret != LDB_SUCCESS) goto failed;
+
+	trans = ldb_transaction_commit(wins_db);
+	if (trans != LDB_SUCCESS) goto failed;
+
+	wins_hook(h, rec, WINS_HOOK_MODIFY, h->hook_script);
+
+	talloc_free(tmp_ctx);
+	return NBT_RCODE_OK;
+
+failed:
+	if (trans == LDB_SUCCESS) ldb_transaction_cancel(wins_db);
+	talloc_free(tmp_ctx);
+	return NBT_RCODE_SVR;
+}
+
+
+/*
+  delete a WINS record from the database
+*/
+uint8_t winsdb_delete(struct winsdb_handle *h, struct winsdb_record *rec)
+{
+	struct ldb_context *wins_db = h->ldb;
+	TALLOC_CTX *tmp_ctx = talloc_new(wins_db);
+	struct ldb_dn *dn;
+	int trans;
+	int ret;
+
+	trans = ldb_transaction_start(wins_db);
+	if (trans != LDB_SUCCESS) goto failed;
+
+	dn = winsdb_dn(tmp_ctx, wins_db, rec->name);
+	if (dn == NULL) goto failed;
+
+	ret = ldb_delete(wins_db, dn);
+	if (ret != LDB_SUCCESS) goto failed;
+
+	trans = ldb_transaction_commit(wins_db);
+	if (trans != LDB_SUCCESS) goto failed;
+
+	wins_hook(h, rec, WINS_HOOK_DELETE, h->hook_script);
+
+	talloc_free(tmp_ctx);
+	return NBT_RCODE_OK;
+
+failed:
+	if (trans == LDB_SUCCESS) ldb_transaction_cancel(wins_db);
+	talloc_free(tmp_ctx);
+	return NBT_RCODE_SVR;
+}
+
+static bool winsdb_check_or_add_module_list(struct tevent_context *ev_ctx, 
+					    struct loadparm_context *lp_ctx, struct winsdb_handle *h,
+					    const char *wins_path)
+{
+	int trans;
+	int ret;
+	struct ldb_dn *dn;
+	struct ldb_result *res = NULL;
+	struct ldb_message *msg = NULL;
+	TALLOC_CTX *tmp_ctx = talloc_new(h);
+	unsigned int flags = 0;
+
+	trans = ldb_transaction_start(h->ldb);
+	if (trans != LDB_SUCCESS) goto failed;
+
+	/* check if we have a special @MODULES record already */
+	dn = ldb_dn_new(tmp_ctx, h->ldb, "@MODULES");
+	if (!dn) goto failed;
+
+	/* find the record in the WINS database */
+	ret = ldb_search(h->ldb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, NULL, NULL);
+	if (ret != LDB_SUCCESS) goto failed;
+
+	if (res->count > 0) goto skip;
+
+	/* if there's no record, add one */
+	msg = ldb_msg_new(tmp_ctx);
+	if (!msg) goto failed;
+	msg->dn = dn;
+
+	ret = ldb_msg_add_string(msg, "@LIST", "wins_ldb");
+	if (ret != LDB_SUCCESS) goto failed;
+
+	ret = ldb_add(h->ldb, msg);
+	if (ret != LDB_SUCCESS) goto failed;
+
+	trans = ldb_transaction_commit(h->ldb);
+	if (trans != LDB_SUCCESS) goto failed;
+
+	/* close and reopen the database, with the modules */
+	trans = LDB_ERR_OTHER;
+	talloc_free(h->ldb);
+	h->ldb = NULL;
+
+	if (lpcfg_parm_bool(lp_ctx, NULL,"winsdb", "nosync", false)) {
+		flags |= LDB_FLG_NOSYNC;
+	}
+
+	h->ldb = ldb_wrap_connect(h, ev_ctx, lp_ctx, wins_path,
+				  NULL, NULL, flags);
+	if (!h->ldb) goto failed;
+
+	talloc_free(tmp_ctx);
+	return true;
+
+skip:
+	if (trans == LDB_SUCCESS) ldb_transaction_cancel(h->ldb);
+	talloc_free(tmp_ctx);
+	return true;
+
+failed:
+	if (trans == LDB_SUCCESS) ldb_transaction_cancel(h->ldb);
+	talloc_free(tmp_ctx);
+	return false;
+}
+
+struct winsdb_handle *winsdb_connect(TALLOC_CTX *mem_ctx, 
+				     struct tevent_context *ev_ctx,
+				     struct loadparm_context *lp_ctx,
+				     const char *owner,
+				     enum winsdb_handle_caller caller)
+{
+	const struct loadparm_substitution *lp_sub =
+		lpcfg_noop_substitution();
+	struct winsdb_handle *h = NULL;
+	unsigned int flags = 0;
+	bool ret;
+	int ldb_err;
+	char *wins_path;
+
+	h = talloc_zero(mem_ctx, struct winsdb_handle);
+	if (!h) return NULL;
+
+	wins_path = lpcfg_state_path(h, lp_ctx, "wins.ldb");
+
+	if (lpcfg_parm_bool(lp_ctx, NULL,"winsdb", "nosync", false)) {
+		flags |= LDB_FLG_NOSYNC;
+	}
+
+	h->ldb = ldb_wrap_connect(h, ev_ctx, lp_ctx, wins_path,
+				  NULL, NULL, flags);
+	if (!h->ldb) goto failed;
+
+	h->caller = caller;
+	h->hook_script = lpcfg_wins_hook(lp_ctx, lp_sub, h);
+
+	h->local_owner = talloc_strdup(h, owner);
+	if (!h->local_owner) goto failed;
+
+	/* make sure the module list is available and used */
+	ret = winsdb_check_or_add_module_list(ev_ctx, lp_ctx, h, wins_path);
+	if (!ret) goto failed;
+
+	ldb_err = ldb_set_opaque(h->ldb, "winsdb_handle", h);
+	if (ldb_err != LDB_SUCCESS) goto failed;
+
+	return h;
+failed:
+	talloc_free(h);
+	return NULL;
+}
+
diff --git a/source4/nbt_server/wins/winsdb.h b/source4/nbt_server/wins/winsdb.h
new file mode 100644
index 0000000..194bcc0
--- /dev/null
+++ b/source4/nbt_server/wins/winsdb.h
@@ -0,0 +1,81 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   WINS server structures
+
+   Copyright (C) Andrew Tridgell	2005
+   
+   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/>.
+*/
+
+#define WINSDB_FLAG_ALLOC_VERSION	(1<<0)
+#define WINSDB_FLAG_TAKE_OWNERSHIP	(1<<1)
+
+struct winsdb_addr {
+	const char *address;
+	const char *wins_owner;
+	time_t expire_time;
+};
+
+/*
+  each record in the database contains the following information
+*/
+struct winsdb_record {
+	struct nbt_name *name;
+	enum wrepl_name_type type;
+	enum wrepl_name_state state;
+	enum wrepl_name_node node;
+	bool is_static;
+	time_t expire_time;
+	uint64_t version;
+	const char *wins_owner;
+	struct winsdb_addr **addresses;
+
+	/* only needed for debugging problems */
+	const char *registered_by;
+};
+
+enum winsdb_handle_caller {
+	WINSDB_HANDLE_CALLER_ADMIN	= 0,
+	WINSDB_HANDLE_CALLER_NBTD	= 1,
+	WINSDB_HANDLE_CALLER_WREPL	= 2
+};
+
+struct winsdb_handle {
+	/* wins server database handle */
+	struct ldb_context *ldb;
+
+	/*
+	 * the type of the caller, as we pass this to the
+	 * 'wins_ldb' ldb module can decide if it needs to verify the 
+	 * the records before they're written to disk
+	 */
+	enum winsdb_handle_caller caller;
+
+	/* local owner address */
+	const char *local_owner;
+
+	/* wins hook script */
+	const char *hook_script;
+};
+
+enum wins_hook_action {
+	WINS_HOOK_ADD		= 0,
+	WINS_HOOK_MODIFY	= 1,
+	WINS_HOOK_DELETE	= 2
+};
+
+struct ldb_message;
+struct tevent_context;
+#include "nbt_server/wins/winsdb_proto.h"
diff --git a/source4/nbt_server/wins/winsserver.c b/source4/nbt_server/wins/winsserver.c
new file mode 100644
index 0000000..a9f3ecd
--- /dev/null
+++ b/source4/nbt_server/wins/winsserver.c
@@ -0,0 +1,1074 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   core wins server handling
+
+   Copyright (C) Andrew Tridgell	2005
+   Copyright (C) Stefan Metzmacher	2005
+      
+   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/util/dlinklist.h"
+#include "nbt_server/nbt_server.h"
+#include "nbt_server/wins/winsdb.h"
+#include "nbt_server/wins/winsserver.h"
+#include "librpc/gen_ndr/ndr_nbt.h"
+#include "system/time.h"
+#include "libcli/composite/composite.h"
+#include "samba/service_task.h"
+#include "system/network.h"
+#include "lib/socket/socket.h"
+#include "lib/socket/netif.h"
+#include <ldb.h>
+#include "param/param.h"
+#include "libcli/resolve/resolve.h"
+#include "lib/util/util_net.h"
+
+/*
+  work out the ttl we will use given a client requested ttl
+*/
+uint32_t wins_server_ttl(struct wins_server *winssrv, uint32_t ttl)
+{
+	ttl = MIN(ttl, winssrv->config.max_renew_interval);
+	ttl = MAX(ttl, winssrv->config.min_renew_interval);
+	return ttl;
+}
+
+static enum wrepl_name_type wrepl_type(uint16_t nb_flags, struct nbt_name *name, bool mhomed)
+{
+	/* this copes with the nasty hack that is the type 0x1c name */
+	if (name->type == NBT_NAME_LOGON) {
+		return WREPL_TYPE_SGROUP;
+	}
+	if (nb_flags & NBT_NM_GROUP) {
+		return WREPL_TYPE_GROUP;
+	}
+	if (mhomed) {
+		return WREPL_TYPE_MHOMED;
+	}
+	return WREPL_TYPE_UNIQUE;
+}
+
+/*
+  register a new name with WINS
+*/
+static uint8_t wins_register_new(struct nbt_name_socket *nbtsock, 
+				 struct nbt_name_packet *packet, 
+				 const struct socket_address *src,
+				 enum wrepl_name_type type)
+{
+	struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
+						       struct nbtd_interface);
+	struct wins_server *winssrv = iface->nbtsrv->winssrv;
+	struct nbt_name *name = &packet->questions[0].name;
+	uint32_t ttl = wins_server_ttl(winssrv, packet->additional[0].ttl);
+	uint16_t nb_flags = packet->additional[0].rdata.netbios.addresses[0].nb_flags;
+	const char *address = packet->additional[0].rdata.netbios.addresses[0].ipaddr;
+	struct winsdb_record rec;
+	enum wrepl_name_node node;
+
+#define WREPL_NODE_NBT_FLAGS(nb_flags) \
+	((nb_flags & NBT_NM_OWNER_TYPE)>>13)
+
+	node	= WREPL_NODE_NBT_FLAGS(nb_flags);
+
+	rec.name		= name;
+	rec.type		= type;
+	rec.state		= WREPL_STATE_ACTIVE;
+	rec.node		= node;
+	rec.is_static		= false;
+	rec.expire_time		= time(NULL) + ttl;
+	rec.version		= 0; /* will be allocated later */
+	rec.wins_owner		= NULL; /* will be set later */
+	rec.registered_by	= src->addr;
+	rec.addresses		= winsdb_addr_list_make(packet);
+	if (rec.addresses == NULL) return NBT_RCODE_SVR;
+
+	rec.addresses     = winsdb_addr_list_add(winssrv->wins_db,
+						 &rec, rec.addresses,
+						 address,
+						 winssrv->wins_db->local_owner,
+						 rec.expire_time,
+						 true);
+	if (rec.addresses == NULL) return NBT_RCODE_SVR;
+
+	DEBUG(4,("WINS: accepted registration of %s with address %s\n",
+		 nbt_name_string(packet, name), rec.addresses[0]->address));
+	
+	return winsdb_add(winssrv->wins_db, &rec, WINSDB_FLAG_ALLOC_VERSION | WINSDB_FLAG_TAKE_OWNERSHIP);
+}
+
+
+/*
+  update the ttl on an existing record
+*/
+static uint8_t wins_update_ttl(struct nbt_name_socket *nbtsock, 
+			       struct nbt_name_packet *packet, 
+			       struct winsdb_record *rec,
+			       struct winsdb_addr *winsdb_addr,
+			       const struct socket_address *src)
+{
+	struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
+						       struct nbtd_interface);
+	struct wins_server *winssrv = iface->nbtsrv->winssrv;
+	uint32_t ttl = wins_server_ttl(winssrv, packet->additional[0].ttl);
+	const char *address = packet->additional[0].rdata.netbios.addresses[0].ipaddr;
+	uint32_t modify_flags = 0;
+
+	rec->expire_time   = time(NULL) + ttl;
+	rec->registered_by = src->addr;
+
+	if (winsdb_addr) {
+		rec->addresses = winsdb_addr_list_add(winssrv->wins_db,
+						      rec, rec->addresses,
+						      winsdb_addr->address,
+						      winssrv->wins_db->local_owner,
+						      rec->expire_time,
+						      true);
+		if (rec->addresses == NULL) return NBT_RCODE_SVR;
+	}
+
+	if (strcmp(winssrv->wins_db->local_owner, rec->wins_owner) != 0) {
+		modify_flags = WINSDB_FLAG_ALLOC_VERSION | WINSDB_FLAG_TAKE_OWNERSHIP;
+	}
+
+	DEBUG(5,("WINS: refreshed registration of %s at %s\n",
+		 nbt_name_string(packet, rec->name), address));
+	
+	return winsdb_modify(winssrv->wins_db, rec, modify_flags);
+}
+
+/*
+  do a sgroup merge
+*/
+static uint8_t wins_sgroup_merge(struct nbt_name_socket *nbtsock, 
+				 struct nbt_name_packet *packet, 
+			         struct winsdb_record *rec,
+			         const char *address,
+			         const struct socket_address *src)
+{
+	struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
+						       struct nbtd_interface);
+	struct wins_server *winssrv = iface->nbtsrv->winssrv;
+	uint32_t ttl = wins_server_ttl(winssrv, packet->additional[0].ttl);
+
+	rec->expire_time   = time(NULL) + ttl;
+	rec->registered_by = src->addr;
+
+	rec->addresses     = winsdb_addr_list_add(winssrv->wins_db,
+						  rec, rec->addresses,
+						  address,
+						  winssrv->wins_db->local_owner,
+						  rec->expire_time,
+						  true);
+	if (rec->addresses == NULL) return NBT_RCODE_SVR;
+
+	DEBUG(5,("WINS: sgroup merge of %s at %s\n",
+		 nbt_name_string(packet, rec->name), address));
+	
+	return winsdb_modify(winssrv->wins_db, rec, WINSDB_FLAG_ALLOC_VERSION | WINSDB_FLAG_TAKE_OWNERSHIP);
+}
+
+struct nbtd_wins_wack_state {
+	struct nbtd_wins_wack_state *prev, *next;
+	struct wins_server *winssrv;
+	struct nbt_name_socket *nbtsock;
+	struct nbtd_interface *iface;
+	struct nbt_name_packet *request_packet;
+	struct winsdb_record *rec;
+	struct socket_address *src;
+	const char *reg_address;
+	enum wrepl_name_type new_type;
+	struct wins_challenge_io io;
+	NTSTATUS status;
+};
+
+static int nbtd_wins_wack_state_destructor(struct nbtd_wins_wack_state *s)
+{
+	DLIST_REMOVE(s->iface->wack_queue, s);
+	return 0;
+}
+
+static bool wins_check_wack_queue(struct nbtd_interface *iface,
+				  struct nbt_name_packet *packet,
+				  struct socket_address *src)
+{
+	struct nbtd_wins_wack_state *s;
+
+	for (s= iface->wack_queue; s; s = s->next) {
+		if (packet->name_trn_id != s->request_packet->name_trn_id) {
+			continue;
+		}
+		if (packet->operation != s->request_packet->operation) {
+			continue;
+		}
+		if (src->port != s->src->port) {
+			continue;
+		}
+		if (strcmp(src->addr, s->src->addr) != 0) {
+			continue;
+		}
+
+		return true;
+	}
+
+	return false;
+}
+
+/*
+  deny a registration request
+*/
+static void wins_wack_deny(struct nbtd_wins_wack_state *s)
+{
+	nbtd_name_registration_reply(s->nbtsock, s->request_packet, 
+				     s->src, NBT_RCODE_ACT);
+	DEBUG(4,("WINS: denied name registration request for %s from %s:%d\n",
+		 nbt_name_string(s, s->rec->name), s->src->addr, s->src->port));
+	talloc_free(s);
+}
+
+/*
+  allow a registration request
+*/
+static void wins_wack_allow(struct nbtd_wins_wack_state *s)
+{
+	NTSTATUS status;
+	uint32_t ttl = wins_server_ttl(s->winssrv, s->request_packet->additional[0].ttl);
+	struct winsdb_record *rec = s->rec, *rec2;
+	uint32_t i,j;
+
+	status = winsdb_lookup(s->winssrv->wins_db, rec->name, s, &rec2);
+	if (!NT_STATUS_IS_OK(status) ||
+	    rec2->version != rec->version ||
+	    strcmp(rec2->wins_owner, rec->wins_owner) != 0) {
+		DEBUG(5,("WINS: record %s changed during WACK - failing registration\n",
+			 nbt_name_string(s, rec->name)));
+		wins_wack_deny(s);
+		return;
+	}
+
+	/*
+	 * if the old name owner doesn't hold the name anymore
+	 * handle the request as new registration for the new name owner
+	 */
+	if (!NT_STATUS_IS_OK(s->status)) {
+		uint8_t rcode;
+
+		winsdb_delete(s->winssrv->wins_db, rec);
+		rcode = wins_register_new(s->nbtsock, s->request_packet, s->src, s->new_type);
+		if (rcode != NBT_RCODE_OK) {
+			DEBUG(1,("WINS: record %s failed to register as new during WACK\n",
+				 nbt_name_string(s, rec->name)));
+			wins_wack_deny(s);
+			return;
+		}
+		goto done;
+	}
+
+	rec->expire_time = time(NULL) + ttl;
+	rec->registered_by = s->src->addr;
+
+	/*
+	 * now remove all addresses that the client doesn't hold anymore
+	 * and update the time stamp and owner for the ones that are still there
+	 */
+	for (i=0; rec->addresses[i]; i++) {
+		bool found = false;
+		for (j=0; j < s->io.out.num_addresses; j++) {
+			if (strcmp(rec->addresses[i]->address, s->io.out.addresses[j]) != 0) continue;
+
+			found = true;
+			break;
+		}
+		if (found) {
+			rec->addresses = winsdb_addr_list_add(s->winssrv->wins_db,
+							      rec, rec->addresses,
+							      s->reg_address,
+							      s->winssrv->wins_db->local_owner,
+							      rec->expire_time,
+							      true);
+			if (rec->addresses == NULL) goto failed;
+			continue;
+		}
+
+		winsdb_addr_list_remove(rec->addresses, rec->addresses[i]->address);
+	}
+
+	rec->addresses = winsdb_addr_list_add(s->winssrv->wins_db,
+					      rec, rec->addresses,
+					      s->reg_address,
+					      s->winssrv->wins_db->local_owner,
+					      rec->expire_time,
+					      true);
+	if (rec->addresses == NULL) goto failed;
+
+	/* if we have more than one address, this becomes implicit a MHOMED record */
+	if (winsdb_addr_list_length(rec->addresses) > 1) {
+		rec->type = WREPL_TYPE_MHOMED;
+	}
+
+	winsdb_modify(s->winssrv->wins_db, rec, WINSDB_FLAG_ALLOC_VERSION | WINSDB_FLAG_TAKE_OWNERSHIP);
+
+	DEBUG(4,("WINS: accepted registration of %s with address %s\n",
+		 nbt_name_string(s, rec->name), s->reg_address));
+
+done:
+	nbtd_name_registration_reply(s->nbtsock, s->request_packet, 
+				     s->src, NBT_RCODE_OK);
+failed:
+	talloc_free(s);
+}
+
+/*
+  called when a name query to a current owner completes
+*/
+static void wack_wins_challenge_handler(struct composite_context *c_req)
+{
+	struct nbtd_wins_wack_state *s = talloc_get_type(c_req->async.private_data,
+					 struct nbtd_wins_wack_state);
+	bool found;
+	uint32_t i;
+
+	s->status = wins_challenge_recv(c_req, s, &s->io);
+
+	/*
+	 * if the owner denies it holds the name, then allow
+	 * the registration
+	 */
+	if (!NT_STATUS_IS_OK(s->status)) {
+		wins_wack_allow(s);
+		return;
+	}
+
+	if (s->new_type == WREPL_TYPE_GROUP || s->new_type == WREPL_TYPE_SGROUP) {
+		DEBUG(1,("WINS: record %s failed to register as group type(%u) during WACK, it's still type(%u)\n",
+			 nbt_name_string(s, s->rec->name), s->new_type, s->rec->type));
+		wins_wack_deny(s);
+		return;
+	}
+
+	/*
+	 * if the owner still wants the name and doesn't reply
+	 * with the address trying to be registered, then deny
+	 * the registration
+	 */
+	found = false;
+	for (i=0; i < s->io.out.num_addresses; i++) {
+		if (strcmp(s->reg_address, s->io.out.addresses[i]) != 0) continue;
+
+		found = true;
+		break;
+	}
+	if (!found) {
+		wins_wack_deny(s);
+		return;
+	}
+
+	wins_wack_allow(s);
+	return;
+}
+
+
+/*
+  a client has asked to register a unique name that someone else owns. We
+  need to ask each of the current owners if they still want it. If they do
+  then reject the registration, otherwise allow it
+*/
+static void wins_register_wack(struct nbt_name_socket *nbtsock, 
+			       struct nbt_name_packet *packet, 
+			       struct winsdb_record *rec,
+			       struct socket_address *src,
+			       enum wrepl_name_type new_type)
+{
+	struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
+						       struct nbtd_interface);
+	struct wins_server *winssrv = iface->nbtsrv->winssrv;
+	struct nbtd_wins_wack_state *s;
+	struct composite_context *c_req;
+	uint32_t ttl;
+
+	s = talloc_zero(nbtsock, struct nbtd_wins_wack_state);
+	if (s == NULL) goto failed;
+
+	/* package up the state variables for this wack request */
+	s->winssrv		= winssrv;
+	s->nbtsock		= nbtsock;
+	s->iface		= iface;
+	s->request_packet	= talloc_steal(s, packet);
+	s->rec			= talloc_steal(s, rec);
+	s->reg_address		= packet->additional[0].rdata.netbios.addresses[0].ipaddr;
+	s->new_type		= new_type;
+	s->src		        = socket_address_copy(s, src);
+	if (s->src == NULL) goto failed;
+
+	s->io.in.nbtd_server	= iface->nbtsrv;
+	s->io.in.nbt_port       = lpcfg_nbt_port(iface->nbtsrv->task->lp_ctx);
+	s->io.in.event_ctx	= iface->nbtsrv->task->event_ctx;
+	s->io.in.name		= rec->name;
+	s->io.in.num_addresses	= winsdb_addr_list_length(rec->addresses);
+	s->io.in.addresses	= winsdb_addr_string_list(s, rec->addresses);
+	if (s->io.in.addresses == NULL) goto failed;
+
+	DLIST_ADD_END(iface->wack_queue, s);
+
+	talloc_set_destructor(s, nbtd_wins_wack_state_destructor);
+
+	/*
+	 * send a WACK to the client, specifying the maximum time it could
+         * take to check with the owner, plus some slack
+	 */
+	ttl = 5 + 4 * winsdb_addr_list_length(rec->addresses);
+	nbtd_wack_reply(nbtsock, packet, src, ttl);
+
+	/*
+	 * send the challenge to the old addresses
+	 */
+	c_req = wins_challenge_send(s, &s->io);
+	if (c_req == NULL) goto failed;
+
+	c_req->async.fn			= wack_wins_challenge_handler;
+	c_req->async.private_data	= s;
+	return;
+
+failed:
+	talloc_free(s);
+	nbtd_name_registration_reply(nbtsock, packet, src, NBT_RCODE_SVR);
+}
+
+/*
+  register a name
+*/
+static void nbtd_winsserver_register(struct nbt_name_socket *nbtsock, 
+				     struct nbt_name_packet *packet, 
+				     struct socket_address *src)
+{
+	NTSTATUS status;
+	struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
+						       struct nbtd_interface);
+	struct wins_server *winssrv = iface->nbtsrv->winssrv;
+	struct nbt_name *name = &packet->questions[0].name;
+	struct winsdb_record *rec;
+	uint8_t rcode = NBT_RCODE_OK;
+	uint16_t nb_flags = packet->additional[0].rdata.netbios.addresses[0].nb_flags;
+	const char *address = packet->additional[0].rdata.netbios.addresses[0].ipaddr;
+	bool mhomed = ((packet->operation & NBT_OPCODE) == NBT_OPCODE_MULTI_HOME_REG);
+	enum wrepl_name_type new_type = wrepl_type(nb_flags, name, mhomed);
+	struct winsdb_addr *winsdb_addr = NULL;
+	bool duplicate_packet;
+
+	/*
+	 * as a special case, the local master browser name is always accepted
+	 * for registration, but never stored, but w2k3 stores it if it's registered
+	 * as a group name, (but a query for the 0x1D name still returns not found!)
+	 */
+	if (name->type == NBT_NAME_MASTER && !(nb_flags & NBT_NM_GROUP)) {
+		rcode = NBT_RCODE_OK;
+		goto done;
+	}
+
+	/* w2k3 refuses 0x1B names with marked as group */
+	if (name->type == NBT_NAME_PDC && (nb_flags & NBT_NM_GROUP)) {
+		rcode = NBT_RCODE_RFS;
+		goto done;
+	}
+
+	/* w2k3 refuses 0x1C names with out marked as group */
+	if (name->type == NBT_NAME_LOGON && !(nb_flags & NBT_NM_GROUP)) {
+		rcode = NBT_RCODE_RFS;
+		goto done;
+	}
+
+	/* w2k3 refuses 0x1E names with out marked as group */
+	if (name->type == NBT_NAME_BROWSER && !(nb_flags & NBT_NM_GROUP)) {
+		rcode = NBT_RCODE_RFS;
+		goto done;
+	}
+
+	if (name->scope && strlen(name->scope) > 237) {
+		rcode = NBT_RCODE_SVR;
+		goto done;
+	}
+
+	duplicate_packet = wins_check_wack_queue(iface, packet, src);
+	if (duplicate_packet) {
+		/* just ignore the packet */
+		DEBUG(5,("Ignoring duplicate packet while WACK is pending from %s:%d\n",
+			 src->addr, src->port));
+		return;
+	}
+
+	status = winsdb_lookup(winssrv->wins_db, name, packet, &rec);
+	if (NT_STATUS_EQUAL(NT_STATUS_OBJECT_NAME_NOT_FOUND, status)) {
+		rcode = wins_register_new(nbtsock, packet, src, new_type);
+		goto done;
+	} else if (!NT_STATUS_IS_OK(status)) {
+		rcode = NBT_RCODE_SVR;
+		goto done;
+	} else if (rec->is_static) {
+		if (rec->type == WREPL_TYPE_GROUP || rec->type == WREPL_TYPE_SGROUP) {
+			rcode = NBT_RCODE_OK;
+			goto done;
+		}
+		rcode = NBT_RCODE_ACT;
+		goto done;
+	}
+
+	if (rec->type == WREPL_TYPE_GROUP) {
+		if (new_type != WREPL_TYPE_GROUP) {
+			DEBUG(2,("WINS: Attempt to register name %s as non normal group(%u)"
+				 " while a normal group is already there\n",
+				 nbt_name_string(packet, name), new_type));
+			rcode = NBT_RCODE_ACT;
+			goto done;
+		}
+
+		if (rec->state == WREPL_STATE_ACTIVE) {
+			/* TODO: is this correct? */
+			rcode = wins_update_ttl(nbtsock, packet, rec, NULL, src);
+			goto done;
+		}
+
+		/* TODO: is this correct? */
+		winsdb_delete(winssrv->wins_db, rec);
+		rcode = wins_register_new(nbtsock, packet, src, new_type);
+		goto done;
+	}
+
+	if (rec->state != WREPL_STATE_ACTIVE) {
+		winsdb_delete(winssrv->wins_db, rec);
+		rcode = wins_register_new(nbtsock, packet, src, new_type);
+		goto done;
+	}
+
+	switch (rec->type) {
+	case WREPL_TYPE_UNIQUE:
+	case WREPL_TYPE_MHOMED:
+		/* 
+		 * if its an active unique name, and the registration is for a group, then
+		 * see if the unique name owner still wants the name
+		 * TODO: is this correct?
+		 */
+		if (new_type == WREPL_TYPE_GROUP || new_type == WREPL_TYPE_GROUP) {
+			wins_register_wack(nbtsock, packet, rec, src, new_type);
+			return;
+		}
+
+		/* 
+		 * if the registration is for an address that is currently active, then 
+		 * just update the expiry time of the record and the address
+		 */
+		winsdb_addr = winsdb_addr_list_check(rec->addresses, address);
+		if (winsdb_addr) {
+			rcode = wins_update_ttl(nbtsock, packet, rec, winsdb_addr, src);
+			goto done;
+		}
+
+		/*
+		 * we have to do a WACK to see if the current owner is willing
+		 * to give up its claim
+		 */
+		wins_register_wack(nbtsock, packet, rec, src, new_type);
+		return;
+
+	case WREPL_TYPE_GROUP:
+		/* this should not be reached as normal groups are handled above */
+		DEBUG(0,("BUG at %s\n",__location__));
+		rcode = NBT_RCODE_ACT;
+		goto done;
+
+	case WREPL_TYPE_SGROUP:
+		/* if the new record isn't also a special group, refuse the registration */ 
+		if (new_type != WREPL_TYPE_SGROUP) {
+			DEBUG(2,("WINS: Attempt to register name %s as non special group(%u)"
+				 " while a special group is already there\n",
+				 nbt_name_string(packet, name), new_type));
+			rcode = NBT_RCODE_ACT;
+			goto done;
+		}
+
+		/* 
+		 * if the registration is for an address that is currently active, then 
+		 * just update the expiry time of the record and the address
+		 */
+		winsdb_addr = winsdb_addr_list_check(rec->addresses, address);
+		if (winsdb_addr) {
+			rcode = wins_update_ttl(nbtsock, packet, rec, winsdb_addr, src);
+			goto done;
+		}
+
+		rcode = wins_sgroup_merge(nbtsock, packet, rec, address, src);
+		goto done;
+	}
+
+done:
+	nbtd_name_registration_reply(nbtsock, packet, src, rcode);
+}
+
+static uint32_t ipv4_match_bits(struct in_addr ip1, struct in_addr ip2)
+{
+	uint32_t i, j, match=0;
+	uint8_t *p1, *p2;
+
+	p1 = (uint8_t *)&ip1.s_addr;
+	p2 = (uint8_t *)&ip2.s_addr;
+
+	for (i=0; i<4; i++) {
+		if (p1[i] != p2[i]) break;
+		match += 8;
+	}
+
+	if (i==4) return match;
+
+	for (j=0; j<8; j++) {
+		if ((p1[i] & (1<<(7-j))) != (p2[i] & (1<<(7-j))))
+			break;
+		match++;
+	}
+
+	return match;
+}
+
+static int nbtd_wins_randomize1Clist_sort(void *p1,/* (const char **) */
+					  void *p2,/* (const char **) */
+					  struct socket_address *src)
+{
+	const char *a1 = (const char *)*(const char **)p1;
+	const char *a2 = (const char *)*(const char **)p2;
+	uint32_t match_bits1;
+	uint32_t match_bits2;
+
+	match_bits1 = ipv4_match_bits(interpret_addr2(a1), interpret_addr2(src->addr));
+	match_bits2 = ipv4_match_bits(interpret_addr2(a2), interpret_addr2(src->addr));
+
+	return match_bits2 - match_bits1;
+}
+
+static void nbtd_wins_randomize1Clist(struct loadparm_context *lp_ctx,
+				      const char **addresses, struct socket_address *src)
+{
+	const char *mask;
+	const char *tmp;
+	uint32_t num_addrs;
+	uint32_t idx, sidx;
+	int r;
+
+	for (num_addrs=0; addresses[num_addrs]; num_addrs++) { /* noop */ }
+
+	if (num_addrs <= 1) return; /* nothing to do */
+
+	/* first sort the addresses depending on the matching to the client */
+	LDB_TYPESAFE_QSORT(addresses, num_addrs, src, nbtd_wins_randomize1Clist_sort);
+
+	mask = lpcfg_parm_string(lp_ctx, NULL, "nbtd", "wins_randomize1Clist_mask");
+	if (!mask) {
+		mask = "255.255.255.0";
+	}
+
+	/* 
+	 * choose a random address to be the first in the response to the client,
+	 * prefer the addresses inside the nbtd:wins_randomize1Clist_mask netmask
+	 */
+	r = random();
+	idx = sidx = r % num_addrs;
+
+	while (1) {
+		bool same;
+
+		/* if the current one is in the same subnet, use it */
+		same = iface_list_same_net(addresses[idx], src->addr, mask);
+		if (same) {
+			sidx = idx;
+			break;
+		}
+
+		/* we need to check for idx == 0, after checking for the same net */
+		if (idx == 0) break;
+		/* 
+		 * if we haven't found an address in the same subnet, search in ones
+		 * which match the client more
+		 *
+		 * some notes:
+		 *
+		 * it's not "idx = idx % r" but "idx = r % idx"
+		 * because in "a % b" b is the allowed range
+		 * and b-1 is the maximum possible result, so it must be decreasing
+		 * and the above idx == 0 check breaks the while(1) loop.
+		 */
+		idx = r % idx;
+	}
+
+	/* note sidx == 0 is also valid here ... */
+	tmp		= addresses[0];
+	addresses[0]	= addresses[sidx];
+	addresses[sidx]	= tmp;
+}
+
+/*
+  query a name
+*/
+static void nbtd_winsserver_query(struct loadparm_context *lp_ctx,
+				  struct nbt_name_socket *nbtsock, 
+				  struct nbt_name_packet *packet, 
+				  struct socket_address *src)
+{
+	NTSTATUS status;
+	struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
+						       struct nbtd_interface);
+	struct wins_server *winssrv = iface->nbtsrv->winssrv;
+	struct nbt_name *name = &packet->questions[0].name;
+	struct winsdb_record *rec;
+	struct winsdb_record *rec_1b = NULL;
+	const char **addresses;
+	const char **addresses_1b = NULL;
+	uint16_t nb_flags = 0;
+
+	if (name->type == NBT_NAME_MASTER) {
+		goto notfound;
+	}
+
+	/*
+	 * w2k3 returns the first address of the 0x1B record as first address
+	 * to a 0x1C query
+	 *
+	 * since Windows 2000 Service Pack 2 there's on option to trigger this behavior:
+	 *
+	 * HKEY_LOCAL_MACHINE\System\CurrentControlset\Services\WINS\Parameters\Prepend1BTo1CQueries
+	 * Typ: Daten REG_DWORD
+	 * Value: 0 = deactivated, 1 = activated
+	 */
+	if (name->type == NBT_NAME_LOGON && 
+	    lpcfg_parm_bool(lp_ctx, NULL, "nbtd", "wins_prepend1Bto1Cqueries", true)) {
+		struct nbt_name name_1b;
+
+		name_1b = *name;
+		name_1b.type = NBT_NAME_PDC;
+
+		status = winsdb_lookup(winssrv->wins_db, &name_1b, packet, &rec_1b);
+		if (NT_STATUS_IS_OK(status)) {
+			addresses_1b = winsdb_addr_string_list(packet, rec_1b->addresses);
+		}
+	}
+
+	status = winsdb_lookup(winssrv->wins_db, name, packet, &rec);
+	if (!NT_STATUS_IS_OK(status)) {
+		if (!lpcfg_wins_dns_proxy(lp_ctx)) {
+			goto notfound;
+		}
+
+		if (name->type != NBT_NAME_CLIENT && name->type != NBT_NAME_SERVER) {
+			goto notfound;
+		}
+
+		nbtd_wins_dns_proxy_query(nbtsock, packet, src);
+		return;
+	}
+
+	/*
+	 * for group's we always reply with
+	 * 255.255.255.255 as address, even if
+	 * the record is released or tombstoned
+	 */
+	if (rec->type == WREPL_TYPE_GROUP) {
+		addresses = str_list_add(NULL, "255.255.255.255");
+		talloc_steal(packet, addresses);
+		if (!addresses) {
+			goto notfound;
+		}
+		nb_flags |= NBT_NM_GROUP;
+		goto found;
+	}
+
+	if (rec->state != WREPL_STATE_ACTIVE) {
+		goto notfound;
+	}
+
+	addresses = winsdb_addr_string_list(packet, rec->addresses);
+	if (!addresses) {
+		goto notfound;
+	}
+
+	/* 
+	 * if addresses_1b isn't NULL, we have a 0x1C query and need to return the
+	 * first 0x1B address as first address
+	 */
+	if (addresses_1b && addresses_1b[0]) {
+		const char **addresses_1c = addresses;
+		uint32_t i;
+		uint32_t num_addrs;
+
+		addresses = str_list_add(NULL, addresses_1b[0]);
+		if (!addresses) {
+			goto notfound;
+		}
+		talloc_steal(packet, addresses);
+		num_addrs = 1;
+
+		for (i=0; addresses_1c[i]; i++) {
+			if (strcmp(addresses_1b[0], addresses_1c[i]) == 0) continue;
+
+			/*
+			 * stop when we already have 25 addresses
+			 */
+			if (num_addrs >= 25) break;
+
+			num_addrs++;			
+			addresses = str_list_add(addresses, addresses_1c[i]);
+			if (!addresses) {
+				goto notfound;
+			}
+		}
+	}
+
+	if (rec->type == WREPL_TYPE_SGROUP) {
+		nb_flags |= NBT_NM_GROUP;
+	} else {
+		nb_flags |= (rec->node <<13);
+	}
+
+	/*
+	 * since Windows 2000 Service Pack 2 there's on option to trigger this behavior:
+	 *
+	 * HKEY_LOCAL_MACHINE\System\CurrentControlset\Services\WINS\Parameters\Randomize1CList
+	 * Typ: Daten REG_DWORD
+	 * Value: 0 = deactivated, 1 = activated
+	 */
+	if (name->type == NBT_NAME_LOGON && 
+	    lpcfg_parm_bool(lp_ctx, NULL, "nbtd", "wins_randomize1Clist", false)) {
+		nbtd_wins_randomize1Clist(lp_ctx, addresses, src);
+	}
+
+found:
+	nbtd_name_query_reply(nbtsock, packet, src, name, 
+			      0, nb_flags, addresses);
+	return;
+
+notfound:
+	nbtd_negative_name_query_reply(nbtsock, packet, src);
+}
+
+/*
+  release a name
+*/
+static void nbtd_winsserver_release(struct nbt_name_socket *nbtsock, 
+				    struct nbt_name_packet *packet, 
+				    struct socket_address *src)
+{
+	NTSTATUS status;
+	struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
+						       struct nbtd_interface);
+	struct wins_server *winssrv = iface->nbtsrv->winssrv;
+	struct nbt_name *name = &packet->questions[0].name;
+	struct winsdb_record *rec;
+	uint32_t modify_flags = 0;
+	uint8_t ret;
+
+	if (name->type == NBT_NAME_MASTER) {
+		goto done;
+	}
+
+	if (name->scope && strlen(name->scope) > 237) {
+		goto done;
+	}
+
+	status = winsdb_lookup(winssrv->wins_db, name, packet, &rec);
+	if (!NT_STATUS_IS_OK(status)) {
+		goto done;
+	}
+
+	if (rec->is_static) {
+		if (rec->type == WREPL_TYPE_UNIQUE || rec->type == WREPL_TYPE_MHOMED) {
+			goto done;
+		}
+		nbtd_name_release_reply(nbtsock, packet, src, NBT_RCODE_ACT);
+		return;
+	}
+
+	if (rec->state != WREPL_STATE_ACTIVE) {
+		goto done;
+	}
+
+	/* 
+	 * TODO: do we need to check if
+	 *       src->addr matches packet->additional[0].rdata.netbios.addresses[0].ipaddr
+	 *       here?
+	 */
+
+	/* 
+	 * we only allow releases from an owner - other releases are
+	 * silently ignored
+	 */
+	if (!winsdb_addr_list_check(rec->addresses, src->addr)) {
+		int i;
+		DEBUG(4,("WINS: silently ignoring attempted name release on %s from %s\n", nbt_name_string(rec, rec->name), src->addr));
+		DEBUGADD(4, ("Registered Addresses: \n"));
+		for (i=0; rec->addresses && rec->addresses[i]; i++) {
+			DEBUGADD(4, ("%s\n", rec->addresses[i]->address));
+		}
+		goto done;
+	}
+
+	DEBUG(4,("WINS: released name %s from %s\n", nbt_name_string(rec, rec->name), src->addr));
+
+	switch (rec->type) {
+	case WREPL_TYPE_UNIQUE:
+		rec->state = WREPL_STATE_RELEASED;
+		break;
+
+	case WREPL_TYPE_GROUP:
+		rec->state = WREPL_STATE_RELEASED;
+		break;
+
+	case WREPL_TYPE_SGROUP:
+		winsdb_addr_list_remove(rec->addresses, src->addr);
+		/* TODO: do we need to take the ownership here? */
+		if (winsdb_addr_list_length(rec->addresses) == 0) {
+			rec->state = WREPL_STATE_RELEASED;
+		}
+		break;
+
+	case WREPL_TYPE_MHOMED:
+		winsdb_addr_list_remove(rec->addresses, src->addr);
+		/* TODO: do we need to take the ownership here? */
+		if (winsdb_addr_list_length(rec->addresses) == 0) {
+			rec->state = WREPL_STATE_RELEASED;
+		}
+		break;
+	}
+
+	if (rec->state == WREPL_STATE_ACTIVE) {
+		/*
+		 * If the record is still active, we need to update the
+		 * expire_time.
+		 *
+		 * if we're not the owner, we need to take the ownership.
+		 */
+		rec->expire_time= time(NULL) + winssrv->config.max_renew_interval;
+		if (strcmp(rec->wins_owner, winssrv->wins_db->local_owner) != 0) {
+			modify_flags = WINSDB_FLAG_ALLOC_VERSION | WINSDB_FLAG_TAKE_OWNERSHIP;
+		}
+		if (lpcfg_parm_bool(iface->nbtsrv->task->lp_ctx, NULL, "wreplsrv", "propagate name releases", false)) {
+			/*
+			 * We have an option to propagate every name release,
+			 * this is off by default to match windows servers
+			 */
+			modify_flags = WINSDB_FLAG_ALLOC_VERSION | WINSDB_FLAG_TAKE_OWNERSHIP;
+		}
+	} else if (rec->state == WREPL_STATE_RELEASED) {
+		/*
+		 * if we're not the owner, we need to take the owner ship
+		 * and make the record tombstone, but expire after
+		 * tombstone_interval + tombstone_timeout and not only after tombstone_timeout
+		 * like for normal tombstone records.
+		 * This is to replicate the record directly to the original owner,
+		 * where the record is still active
+		 */ 
+		if (strcmp(rec->wins_owner, winssrv->wins_db->local_owner) == 0) {
+			rec->expire_time= time(NULL) + winssrv->config.tombstone_interval;
+		} else {
+			rec->state	= WREPL_STATE_TOMBSTONE;
+			rec->expire_time= time(NULL) + 
+					  winssrv->config.tombstone_interval +
+					  winssrv->config.tombstone_timeout;
+			modify_flags	= WINSDB_FLAG_ALLOC_VERSION | WINSDB_FLAG_TAKE_OWNERSHIP;
+		}
+	}
+
+	ret = winsdb_modify(winssrv->wins_db, rec, modify_flags);
+	if (ret != NBT_RCODE_OK) {
+		DEBUG(1,("WINS: FAILED: released name %s at %s: error:%u\n",
+			nbt_name_string(rec, rec->name), src->addr, ret));
+	}
+done:
+	/* we match w2k3 by always giving a positive reply to name releases. */
+	nbtd_name_release_reply(nbtsock, packet, src, NBT_RCODE_OK);
+}
+
+
+/*
+  answer a name query
+*/
+void nbtd_winsserver_request(struct nbt_name_socket *nbtsock, 
+			     struct nbt_name_packet *packet, 
+			     struct socket_address *src)
+{
+	struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
+						       struct nbtd_interface);
+	struct wins_server *winssrv = iface->nbtsrv->winssrv;
+	if ((packet->operation & NBT_FLAG_BROADCAST) || winssrv == NULL) {
+		return;
+	}
+
+	switch (packet->operation & NBT_OPCODE) {
+	case NBT_OPCODE_QUERY:
+		nbtd_winsserver_query(iface->nbtsrv->task->lp_ctx, nbtsock, packet, src);
+		break;
+
+	case NBT_OPCODE_REGISTER:
+	case NBT_OPCODE_REFRESH:
+	case NBT_OPCODE_REFRESH2:
+	case NBT_OPCODE_MULTI_HOME_REG:
+		nbtd_winsserver_register(nbtsock, packet, src);
+		break;
+
+	case NBT_OPCODE_RELEASE:
+		nbtd_winsserver_release(nbtsock, packet, src);
+		break;
+	}
+
+}
+
+/*
+  startup the WINS server, if configured
+*/
+NTSTATUS nbtd_winsserver_init(struct nbtd_server *nbtsrv)
+{
+	uint32_t tmp;
+	const char *owner;
+
+	if (!lpcfg_we_are_a_wins_server(nbtsrv->task->lp_ctx)) {
+		nbtsrv->winssrv = NULL;
+		return NT_STATUS_OK;
+	}
+
+	nbtsrv->winssrv = talloc_zero(nbtsrv, struct wins_server);
+	NT_STATUS_HAVE_NO_MEMORY(nbtsrv->winssrv);
+
+	nbtsrv->winssrv->config.max_renew_interval = lpcfg_max_wins_ttl(nbtsrv->task->lp_ctx);
+	nbtsrv->winssrv->config.min_renew_interval = lpcfg_min_wins_ttl(nbtsrv->task->lp_ctx);
+	tmp = lpcfg_parm_int(nbtsrv->task->lp_ctx, NULL, "wreplsrv", "tombstone_interval", 6*24*60*60);
+	nbtsrv->winssrv->config.tombstone_interval = tmp;
+	tmp = lpcfg_parm_int(nbtsrv->task->lp_ctx, NULL, "wreplsrv"," tombstone_timeout", 1*24*60*60);
+	nbtsrv->winssrv->config.tombstone_timeout = tmp;
+
+	owner = lpcfg_parm_string(nbtsrv->task->lp_ctx, NULL, "winsdb", "local_owner");
+
+	if (owner == NULL) {
+		struct interface *ifaces;
+		load_interface_list(nbtsrv->task, nbtsrv->task->lp_ctx, &ifaces);
+		owner = iface_list_first_v4(ifaces);
+	}
+
+	nbtsrv->winssrv->wins_db     = winsdb_connect(nbtsrv->winssrv, nbtsrv->task->event_ctx, 
+						      nbtsrv->task->lp_ctx,
+						      owner, WINSDB_HANDLE_CALLER_NBTD);
+	if (!nbtsrv->winssrv->wins_db) {
+		return NT_STATUS_INTERNAL_DB_ERROR;
+	}
+
+	irpc_add_name(nbtsrv->task->msg_ctx, "wins_server");
+
+	return NT_STATUS_OK;
+}
diff --git a/source4/nbt_server/wins/winsserver.h b/source4/nbt_server/wins/winsserver.h
new file mode 100644
index 0000000..803a9e2
--- /dev/null
+++ b/source4/nbt_server/wins/winsserver.h
@@ -0,0 +1,67 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   wins server WACK processing
+
+   Copyright (C) Stefan Metzmacher	2005
+   
+   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/>.
+*/
+
+struct wins_server {
+	/* wins server database handle */
+	struct winsdb_handle *wins_db;
+
+	/* some configuration */
+	struct {
+		/* 
+		 * the interval (in secs) till an active record will be marked as RELEASED
+		 */
+		uint32_t min_renew_interval;
+		uint32_t max_renew_interval;
+
+		/* 
+		 * the interval (in secs) a record remains in RELEASED state,
+		 * before it will be marked as TOMBSTONE
+		 * (also known as extinction interval)
+		 */
+		uint32_t tombstone_interval;
+
+		/* 
+		 * the interval (in secs) a record remains in TOMBSTONE state,
+		 * before it will be removed from the database.
+		 * See also 'tombstone_extra_timeout'.
+		 * (also known as extinction timeout)
+		 */
+		uint32_t tombstone_timeout;
+	} config;
+};
+
+struct wins_challenge_io {
+	struct {
+		struct nbtd_server *nbtd_server;
+		uint16_t nbt_port;
+		struct tevent_context *event_ctx;
+		struct nbt_name *name;
+		uint32_t num_addresses;
+		const char **addresses;
+	} in;
+	struct {
+		uint32_t num_addresses;
+		const char **addresses;
+	} out;
+};
+
+struct composite_context;
+#include "nbt_server/wins/winsserver_proto.h"
diff --git a/source4/nbt_server/wins/winswack.c b/source4/nbt_server/wins/winswack.c
new file mode 100644
index 0000000..735a4e6
--- /dev/null
+++ b/source4/nbt_server/wins/winswack.c
@@ -0,0 +1,387 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   "secure" wins server WACK processing
+
+   Copyright (C) Andrew Tridgell	2005
+   Copyright (C) Stefan Metzmacher	2005
+   
+   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 "nbt_server/nbt_server.h"
+#include "nbt_server/wins/winsdb.h"
+#include "nbt_server/wins/winsserver.h"
+#include "system/time.h"
+#include "libcli/composite/composite.h"
+#include "param/param.h"
+#include "samba/service_task.h"
+
+struct wins_challenge_state {
+	struct wins_challenge_io *io;
+	uint32_t current_address;
+	struct nbt_name_query query;
+};
+
+static void wins_challenge_handler(struct nbt_name_request *req)
+{
+	struct composite_context *ctx = talloc_get_type(req->async.private_data, struct composite_context);
+	struct wins_challenge_state *state = talloc_get_type(ctx->private_data, struct wins_challenge_state);
+
+	ctx->status = nbt_name_query_recv(req, state, &state->query);
+
+	/* if we timed out then try the next owner address, if any */
+	if (NT_STATUS_EQUAL(ctx->status, NT_STATUS_IO_TIMEOUT)) {
+		state->current_address++;
+		if (state->current_address < state->io->in.num_addresses) {
+			struct nbtd_interface *iface;
+
+			state->query.in.dest_port = state->io->in.nbt_port;
+			state->query.in.dest_addr = state->io->in.addresses[state->current_address];
+			
+			iface = nbtd_find_request_iface(state->io->in.nbtd_server, state->query.in.dest_addr, true);
+			if (!iface) {
+				composite_error(ctx, NT_STATUS_INTERNAL_ERROR);
+				return;
+			}
+
+			ZERO_STRUCT(state->query.out);
+			req = nbt_name_query_send(iface->nbtsock, &state->query);
+			composite_continue_nbt(ctx, req, wins_challenge_handler, ctx);
+			return;
+		}
+	}
+
+	composite_done(ctx);
+}
+
+NTSTATUS wins_challenge_recv(struct composite_context *ctx, TALLOC_CTX *mem_ctx, struct wins_challenge_io *io)
+{
+	NTSTATUS status = ctx->status;
+	struct wins_challenge_state *state = talloc_get_type(ctx->private_data, struct wins_challenge_state);
+
+	if (NT_STATUS_IS_OK(status)) {
+		io->out.num_addresses	= state->query.out.num_addrs;
+		io->out.addresses	= state->query.out.reply_addrs;
+		talloc_steal(mem_ctx, io->out.addresses);
+	} else {
+		ZERO_STRUCT(io->out);
+	}
+
+	talloc_free(ctx);
+	return status;
+}
+
+struct composite_context *wins_challenge_send(TALLOC_CTX *mem_ctx, struct wins_challenge_io *io)
+{
+	struct composite_context *result;
+	struct wins_challenge_state *state;
+	struct nbt_name_request *req;
+	struct nbtd_interface *iface;
+
+	result = talloc_zero(mem_ctx, struct composite_context);
+	if (result == NULL) return NULL;
+	result->state = COMPOSITE_STATE_IN_PROGRESS;
+	result->event_ctx = io->in.event_ctx;
+
+	state = talloc_zero(result, struct wins_challenge_state);
+	if (state == NULL) goto failed;
+	result->private_data = state;
+
+	/* package up the state variables for this wack request */
+	state->io		= io;
+	state->current_address	= 0;
+
+	/* setup a name query to the first address */
+	state->query.in.name        = *state->io->in.name;
+	state->query.in.dest_port   = state->io->in.nbt_port;
+	state->query.in.dest_addr   = state->io->in.addresses[state->current_address];
+	state->query.in.broadcast   = false;
+	state->query.in.wins_lookup = true;
+	state->query.in.timeout     = 1;
+	state->query.in.retries     = 2;
+	ZERO_STRUCT(state->query.out);
+
+	iface = nbtd_find_request_iface(state->io->in.nbtd_server, state->query.in.dest_addr, true);
+	if (!iface) {
+		goto failed;
+	}
+
+	req = nbt_name_query_send(iface->nbtsock, &state->query);
+	if (req == NULL) goto failed;
+
+	req->async.fn = wins_challenge_handler;
+	req->async.private_data = result;
+
+	return result;
+failed:
+	talloc_free(result);
+	return NULL;
+}
+
+struct wins_release_demand_io {
+	struct {
+		struct nbtd_server *nbtd_server;
+		struct tevent_context *event_ctx;
+		struct nbt_name *name;
+		uint16_t nb_flags;
+		uint32_t num_addresses;
+		const char **addresses;
+	} in;
+};
+
+struct wins_release_demand_state {
+	struct wins_release_demand_io *io;
+	uint32_t current_address;
+	uint32_t addresses_left;
+	struct nbt_name_release release;
+};
+
+static void wins_release_demand_handler(struct nbt_name_request *req)
+{
+	struct composite_context *ctx = talloc_get_type(req->async.private_data, struct composite_context);
+	struct wins_release_demand_state *state = talloc_get_type(ctx->private_data, struct wins_release_demand_state);
+
+	ctx->status = nbt_name_release_recv(req, state, &state->release);
+
+	/* if we timed out then try the next owner address, if any */
+	if (NT_STATUS_EQUAL(ctx->status, NT_STATUS_IO_TIMEOUT)) {
+		state->current_address++;
+		state->addresses_left--;
+		if (state->current_address < state->io->in.num_addresses) {
+			struct nbtd_interface *iface;
+
+			state->release.in.dest_port = lpcfg_nbt_port(state->io->in.nbtd_server->task->lp_ctx);
+			state->release.in.dest_addr = state->io->in.addresses[state->current_address];
+			state->release.in.address   = state->release.in.dest_addr;
+			state->release.in.timeout   = (state->addresses_left > 1 ? 2 : 1);
+			state->release.in.retries   = (state->addresses_left > 1 ? 0 : 2);
+
+			iface = nbtd_find_request_iface(state->io->in.nbtd_server, state->release.in.dest_addr, true);
+			if (!iface) {
+				composite_error(ctx, NT_STATUS_INTERNAL_ERROR);
+				return;
+			}
+
+			ZERO_STRUCT(state->release.out);
+			req = nbt_name_release_send(iface->nbtsock, &state->release);
+			composite_continue_nbt(ctx, req, wins_release_demand_handler, ctx);
+			return;
+		}
+	}
+
+	composite_done(ctx);
+}
+
+static NTSTATUS wins_release_demand_recv(struct composite_context *ctx,
+					 TALLOC_CTX *mem_ctx,
+					 struct wins_release_demand_io *io)
+{
+	NTSTATUS status = ctx->status;
+	talloc_free(ctx);
+	return status;
+}
+
+static struct composite_context *wins_release_demand_send(TALLOC_CTX *mem_ctx, struct wins_release_demand_io *io)
+{
+	struct composite_context *result;
+	struct wins_release_demand_state *state;
+	struct nbt_name_request *req;
+	struct nbtd_interface *iface;
+
+	result = talloc_zero(mem_ctx, struct composite_context);
+	if (result == NULL) return NULL;
+	result->state = COMPOSITE_STATE_IN_PROGRESS;
+	result->event_ctx = io->in.event_ctx;
+
+	state = talloc_zero(result, struct wins_release_demand_state);
+	if (state == NULL) goto failed;
+	result->private_data = state;
+
+	/* package up the state variables for this wack request */
+	state->io		= io;
+	state->current_address	= 0;
+	state->addresses_left	= state->io->in.num_addresses;
+
+	/* 
+	 * setup a name query to the first address
+	 * - if we have more than one address try the first
+	 *   with 2 secs timeout and no retry
+	 * - otherwise use 1 sec timeout (w2k3 uses 0.5 sec here)
+	 *   with 2 retries
+	 */
+	state->release.in.name        = *state->io->in.name;
+	state->release.in.dest_port   = lpcfg_nbt_port(state->io->in.nbtd_server->task->lp_ctx);
+	state->release.in.dest_addr   = state->io->in.addresses[state->current_address];
+	state->release.in.address     = state->release.in.dest_addr;
+	state->release.in.broadcast   = false;
+	state->release.in.timeout     = (state->addresses_left > 1 ? 2 : 1);
+	state->release.in.retries     = (state->addresses_left > 1 ? 0 : 2);
+	ZERO_STRUCT(state->release.out);
+
+	iface = nbtd_find_request_iface(state->io->in.nbtd_server, state->release.in.dest_addr, true);
+	if (!iface) {
+		goto failed;
+	}
+
+	req = nbt_name_release_send(iface->nbtsock, &state->release);
+	if (req == NULL) goto failed;
+
+	req->async.fn = wins_release_demand_handler;
+	req->async.private_data = result;
+
+	return result;
+failed:
+	talloc_free(result);
+	return NULL;
+}
+
+/*
+  wrepl_server needs to be able to do a name query request, but some windows
+  servers always send the reply to port 137, regardless of the request
+  port. To cope with this we use a irpc request to the NBT server
+  which has port 137 open, and thus can receive the replies
+*/
+struct proxy_wins_challenge_state {
+	struct irpc_message *msg;
+	struct nbtd_proxy_wins_challenge *req;
+	struct wins_challenge_io io;
+	struct composite_context *c_req;
+};
+
+static void proxy_wins_challenge_handler(struct composite_context *c_req)
+{
+	NTSTATUS status;
+	uint32_t i;
+	struct proxy_wins_challenge_state *s = talloc_get_type(c_req->async.private_data,
+							       struct proxy_wins_challenge_state);
+
+	status = wins_challenge_recv(s->c_req, s, &s->io);
+	if (!NT_STATUS_IS_OK(status)) {
+		ZERO_STRUCT(s->req->out);
+		irpc_send_reply(s->msg, status);
+		return;
+	}
+
+	s->req->out.num_addrs	= s->io.out.num_addresses;		
+	/* TODO: fix pidl to handle inline ipv4address arrays */
+	s->req->out.addrs	= talloc_array(s->msg, struct nbtd_proxy_wins_addr,
+					       s->io.out.num_addresses);
+	if (!s->req->out.addrs) {
+		ZERO_STRUCT(s->req->out);
+		irpc_send_reply(s->msg, NT_STATUS_NO_MEMORY);
+		return;
+	}
+	for (i=0; i < s->io.out.num_addresses; i++) {
+		s->req->out.addrs[i].addr = talloc_steal(s->req->out.addrs, s->io.out.addresses[i]);
+	}
+
+	irpc_send_reply(s->msg, status);
+}
+
+NTSTATUS nbtd_proxy_wins_challenge(struct irpc_message *msg, 
+				   struct nbtd_proxy_wins_challenge *req)
+{
+	struct nbtd_server *nbtd_server =
+		talloc_get_type(msg->private_data, struct nbtd_server);
+	struct proxy_wins_challenge_state *s;
+	uint32_t i;
+
+	s = talloc(msg, struct proxy_wins_challenge_state);
+        NT_STATUS_HAVE_NO_MEMORY(s);
+
+	s->msg = msg;
+	s->req = req;
+
+	s->io.in.nbtd_server	= nbtd_server;
+	s->io.in.nbt_port       = lpcfg_nbt_port(nbtd_server->task->lp_ctx);
+	s->io.in.event_ctx	= nbtd_server->task->event_ctx;
+	s->io.in.name		= &req->in.name;
+	s->io.in.num_addresses	= req->in.num_addrs;
+	s->io.in.addresses	= talloc_array(s, const char *, req->in.num_addrs);
+	NT_STATUS_HAVE_NO_MEMORY(s->io.in.addresses);
+	/* TODO: fix pidl to handle inline ipv4address arrays */
+	for (i=0; i < req->in.num_addrs; i++) {
+		s->io.in.addresses[i]	= talloc_steal(s->io.in.addresses, req->in.addrs[i].addr);
+	}
+
+	s->c_req = wins_challenge_send(s, &s->io);
+	NT_STATUS_HAVE_NO_MEMORY(s->c_req);
+
+	s->c_req->async.fn		= proxy_wins_challenge_handler;
+	s->c_req->async.private_data	= s;
+
+	msg->defer_reply = true;
+	return NT_STATUS_OK;
+}
+
+/*
+  wrepl_server needs to be able to do a name release demands, but some windows
+  servers always send the reply to port 137, regardless of the request
+  port. To cope with this we use a irpc request to the NBT server
+  which has port 137 open, and thus can receive the replies
+*/
+struct proxy_wins_release_demand_state {
+	struct irpc_message *msg;
+	struct nbtd_proxy_wins_release_demand *req;
+	struct wins_release_demand_io io;
+	struct composite_context *c_req;
+};
+
+static void proxy_wins_release_demand_handler(struct composite_context *c_req)
+{
+	NTSTATUS status;
+	struct proxy_wins_release_demand_state *s = talloc_get_type(c_req->async.private_data,
+							       struct proxy_wins_release_demand_state);
+
+	status = wins_release_demand_recv(s->c_req, s, &s->io);
+
+	irpc_send_reply(s->msg, status);
+}
+
+NTSTATUS nbtd_proxy_wins_release_demand(struct irpc_message *msg, 
+				   struct nbtd_proxy_wins_release_demand *req)
+{
+	struct nbtd_server *nbtd_server =
+		talloc_get_type(msg->private_data, struct nbtd_server);
+	struct proxy_wins_release_demand_state *s;
+	uint32_t i;
+
+	s = talloc(msg, struct proxy_wins_release_demand_state);
+        NT_STATUS_HAVE_NO_MEMORY(s);
+
+	s->msg = msg;
+	s->req = req;
+
+	s->io.in.nbtd_server	= nbtd_server;
+	s->io.in.event_ctx	= nbtd_server->task->event_ctx;
+	s->io.in.name		= &req->in.name;
+	s->io.in.num_addresses	= req->in.num_addrs;
+	s->io.in.addresses	= talloc_array(s, const char *, req->in.num_addrs);
+	NT_STATUS_HAVE_NO_MEMORY(s->io.in.addresses);
+	/* TODO: fix pidl to handle inline ipv4address arrays */
+	for (i=0; i < req->in.num_addrs; i++) {
+		s->io.in.addresses[i]	= talloc_steal(s->io.in.addresses, req->in.addrs[i].addr);
+	}
+
+	s->c_req = wins_release_demand_send(s, &s->io);
+	NT_STATUS_HAVE_NO_MEMORY(s->c_req);
+
+	s->c_req->async.fn		= proxy_wins_release_demand_handler;
+	s->c_req->async.private_data	= s;
+
+	msg->defer_reply = true;
+	return NT_STATUS_OK;
+}