r23806: update Samba4 with the latest ctdb code.

This doesn't get the ctdb code fully working in Samba4, it just gets
it building and not breaking non-clustered use of Samba. It will take
a bit longer to update some of the calling ctdb_cluster.c code to make
it work correctly in Samba4.

Note also that Samba4 now only links to the client portion of
ctdb. For the moment I am leaving the ctdbd as a separate daemon,
which you install separately from http://ctdb.samba.org/.
(This used to be commit b196077cbb55cbecad87065133c2d67198e31066)

1 files changed, 2140 insertions, 0 deletions

diff --git a/source4/cluster/ctdb/client/ctdb_client.c b/source4/cluster/ctdb/client/ctdb_client.c
new file mode 100644
index 0000000000..b72faa83d7
--- /dev/null
+++ b/source4/cluster/ctdb/client/ctdb_client.c
@@ -0,0 +1,2140 @@
+/* 
+   ctdb daemon code
+
+   Copyright (C) Andrew Tridgell  2007
+   Copyright (C) Ronnie Sahlberg  2007
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "db_wrap.h"
+#include "lib/tdb/include/tdb.h"
+#include "lib/util/dlinklist.h"
+#include "lib/events/events.h"
+#include "system/network.h"
+#include "system/filesys.h"
+#include "../include/ctdb_private.h"
+#include "lib/util/dlinklist.h"
+
+/*
+  allocate a packet for use in client<->daemon communication
+ */
+struct ctdb_req_header *_ctdbd_allocate_pkt(struct ctdb_context *ctdb,
+					    TALLOC_CTX *mem_ctx, 
+					    enum ctdb_operation operation, 
+					    size_t length, size_t slength,
+					    const char *type)
+{
+	int size;
+	struct ctdb_req_header *hdr;
+
+	length = MAX(length, slength);
+	size = (length+(CTDB_DS_ALIGNMENT-1)) & ~(CTDB_DS_ALIGNMENT-1);
+
+	hdr = (struct ctdb_req_header *)talloc_size(mem_ctx, size);
+	if (hdr == NULL) {
+		DEBUG(0,("Unable to allocate packet for operation %u of length %u\n",
+			 operation, (unsigned)length));
+		return NULL;
+	}
+	talloc_set_name_const(hdr, type);
+	memset(hdr, 0, slength);
+	hdr->length       = length;
+	hdr->operation    = operation;
+	hdr->ctdb_magic   = CTDB_MAGIC;
+	hdr->ctdb_version = CTDB_VERSION;
+	hdr->srcnode      = ctdb->vnn;
+	if (ctdb->vnn_map) {
+		hdr->generation = ctdb->vnn_map->generation;
+	}
+
+	return hdr;
+}
+
+/*
+  local version of ctdb_call
+*/
+int ctdb_call_local(struct ctdb_db_context *ctdb_db, struct ctdb_call *call,
+		    struct ctdb_ltdb_header *header, TALLOC_CTX *mem_ctx,
+		    TDB_DATA *data, uint32_t caller)
+{
+	struct ctdb_call_info *c;
+	struct ctdb_registered_call *fn;
+	struct ctdb_context *ctdb = ctdb_db->ctdb;
+	
+	c = talloc(ctdb, struct ctdb_call_info);
+	CTDB_NO_MEMORY(ctdb, c);
+
+	c->key = call->key;
+	c->call_data = &call->call_data;
+	c->record_data.dptr = talloc_memdup(c, data->dptr, data->dsize);
+	c->record_data.dsize = data->dsize;
+	CTDB_NO_MEMORY(ctdb, c->record_data.dptr);
+	c->new_data = NULL;
+	c->reply_data = NULL;
+	c->status = 0;
+
+	for (fn=ctdb_db->calls;fn;fn=fn->next) {
+		if (fn->id == call->call_id) break;
+	}
+	if (fn == NULL) {
+		ctdb_set_error(ctdb, "Unknown call id %u\n", call->call_id);
+		talloc_free(c);
+		return -1;
+	}
+
+	if (fn->fn(c) != 0) {
+		ctdb_set_error(ctdb, "ctdb_call %u failed\n", call->call_id);
+		talloc_free(c);
+		return -1;
+	}
+
+	if (header->laccessor != caller) {
+		header->lacount = 0;
+	}
+	header->laccessor = caller;
+	header->lacount++;
+
+	/* we need to force the record to be written out if this was a remote access,
+	   so that the lacount is updated */
+	if (c->new_data == NULL && header->laccessor != ctdb->vnn) {
+		c->new_data = &c->record_data;
+	}
+
+	if (c->new_data) {
+		/* XXX check that we always have the lock here? */
+		if (ctdb_ltdb_store(ctdb_db, call->key, header, *c->new_data) != 0) {
+			ctdb_set_error(ctdb, "ctdb_call tdb_store failed\n");
+			talloc_free(c);
+			return -1;
+		}
+	}
+
+	if (c->reply_data) {
+		call->reply_data = *c->reply_data;
+		talloc_steal(ctdb, call->reply_data.dptr);
+		talloc_set_name_const(call->reply_data.dptr, __location__);
+	} else {
+		call->reply_data.dptr = NULL;
+		call->reply_data.dsize = 0;
+	}
+	call->status = c->status;
+
+	talloc_free(c);
+
+	return 0;
+}
+
+
+/*
+  queue a packet for sending from client to daemon
+*/
+static int ctdb_client_queue_pkt(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
+{
+	return ctdb_queue_send(ctdb->daemon.queue, (uint8_t *)hdr, hdr->length);
+}
+
+
+/*
+  state of a in-progress ctdb call in client
+*/
+struct ctdb_client_call_state {
+	enum call_state state;
+	uint32_t reqid;
+	struct ctdb_db_context *ctdb_db;
+	struct ctdb_call call;
+};
+
+/*
+  called when a CTDB_REPLY_CALL packet comes in in the client
+
+  This packet comes in response to a CTDB_REQ_CALL request packet. It
+  contains any reply data from the call
+*/
+static void ctdb_client_reply_call(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
+{
+	struct ctdb_reply_call *c = (struct ctdb_reply_call *)hdr;
+	struct ctdb_client_call_state *state;
+
+	state = ctdb_reqid_find(ctdb, hdr->reqid, struct ctdb_client_call_state);
+	if (state == NULL) {
+		DEBUG(0,(__location__ " reqid %u not found\n", hdr->reqid));
+		return;
+	}
+
+	if (hdr->reqid != state->reqid) {
+		/* we found a record  but it was the wrong one */
+		DEBUG(0, ("Dropped client call reply with reqid:%u\n",hdr->reqid));
+		return;
+	}
+
+	state->call.reply_data.dptr = c->data;
+	state->call.reply_data.dsize = c->datalen;
+	state->call.status = c->status;
+
+	talloc_steal(state, c);
+
+	state->state = CTDB_CALL_DONE;
+}
+
+static void ctdb_client_reply_control(struct ctdb_context *ctdb, struct ctdb_req_header *hdr);
+
+/*
+  this is called in the client, when data comes in from the daemon
+ */
+static void ctdb_client_read_cb(uint8_t *data, size_t cnt, void *args)
+{
+	struct ctdb_context *ctdb = talloc_get_type(args, struct ctdb_context);
+	struct ctdb_req_header *hdr = (struct ctdb_req_header *)data;
+	TALLOC_CTX *tmp_ctx;
+
+	/* place the packet as a child of a tmp_ctx. We then use
+	   talloc_free() below to free it. If any of the calls want
+	   to keep it, then they will steal it somewhere else, and the
+	   talloc_free() will be a no-op */
+	tmp_ctx = talloc_new(ctdb);
+	talloc_steal(tmp_ctx, hdr);
+
+	if (cnt == 0) {
+		DEBUG(2,("Daemon has exited - shutting down client\n"));
+		exit(0);
+	}
+
+	if (cnt < sizeof(*hdr)) {
+		DEBUG(0,("Bad packet length %u in client\n", (unsigned)cnt));
+		goto done;
+	}
+	if (cnt != hdr->length) {
+		ctdb_set_error(ctdb, "Bad header length %u expected %u in client\n", 
+			       (unsigned)hdr->length, (unsigned)cnt);
+		goto done;
+	}
+
+	if (hdr->ctdb_magic != CTDB_MAGIC) {
+		ctdb_set_error(ctdb, "Non CTDB packet rejected in client\n");
+		goto done;
+	}
+
+	if (hdr->ctdb_version != CTDB_VERSION) {
+		ctdb_set_error(ctdb, "Bad CTDB version 0x%x rejected in client\n", hdr->ctdb_version);
+		goto done;
+	}
+
+	switch (hdr->operation) {
+	case CTDB_REPLY_CALL:
+		ctdb_client_reply_call(ctdb, hdr);
+		break;
+
+	case CTDB_REQ_MESSAGE:
+		ctdb_request_message(ctdb, hdr);
+		break;
+
+	case CTDB_REPLY_CONTROL:
+		ctdb_client_reply_control(ctdb, hdr);
+		break;
+
+	default:
+		DEBUG(0,("bogus operation code:%u\n",hdr->operation));
+	}
+
+done:
+	talloc_free(tmp_ctx);
+}
+
+/*
+  connect to a unix domain socket
+*/
+int ctdb_socket_connect(struct ctdb_context *ctdb)
+{
+	struct sockaddr_un addr;
+
+	memset(&addr, 0, sizeof(addr));
+	addr.sun_family = AF_UNIX;
+	strncpy(addr.sun_path, ctdb->daemon.name, sizeof(addr.sun_path));
+
+	ctdb->daemon.sd = socket(AF_UNIX, SOCK_STREAM, 0);
+	if (ctdb->daemon.sd == -1) {
+		return -1;
+	}
+
+	set_nonblocking(ctdb->daemon.sd);
+	set_close_on_exec(ctdb->daemon.sd);
+	
+	if (connect(ctdb->daemon.sd, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
+		close(ctdb->daemon.sd);
+		ctdb->daemon.sd = -1;
+		return -1;
+	}
+
+	ctdb->daemon.queue = ctdb_queue_setup(ctdb, ctdb, ctdb->daemon.sd, 
+					      CTDB_DS_ALIGNMENT, 
+					      ctdb_client_read_cb, ctdb);
+	return 0;
+}
+
+
+struct ctdb_record_handle {
+	struct ctdb_db_context *ctdb_db;
+	TDB_DATA key;
+	TDB_DATA *data;
+	struct ctdb_ltdb_header header;
+};
+
+
+/*
+  make a recv call to the local ctdb daemon - called from client context
+
+  This is called when the program wants to wait for a ctdb_call to complete and get the 
+  results. This call will block unless the call has already completed.
+*/
+int ctdb_call_recv(struct ctdb_client_call_state *state, struct ctdb_call *call)
+{
+	while (state->state < CTDB_CALL_DONE) {
+		event_loop_once(state->ctdb_db->ctdb->ev);
+	}
+	if (state->state != CTDB_CALL_DONE) {
+		DEBUG(0,(__location__ " ctdb_call_recv failed\n"));
+		talloc_free(state);
+		return -1;
+	}
+
+	if (state->call.reply_data.dsize) {
+		call->reply_data.dptr = talloc_memdup(state->ctdb_db,
+						      state->call.reply_data.dptr,
+						      state->call.reply_data.dsize);
+		call->reply_data.dsize = state->call.reply_data.dsize;
+	} else {
+		call->reply_data.dptr = NULL;
+		call->reply_data.dsize = 0;
+	}
+	call->status = state->call.status;
+	talloc_free(state);
+
+	return 0;
+}
+
+
+
+
+/*
+  destroy a ctdb_call in client
+*/
+static int ctdb_client_call_destructor(struct ctdb_client_call_state *state)	
+{
+	ctdb_reqid_remove(state->ctdb_db->ctdb, state->reqid);
+	return 0;
+}
+
+/*
+  construct an event driven local ctdb_call
+
+  this is used so that locally processed ctdb_call requests are processed
+  in an event driven manner
+*/
+static struct ctdb_client_call_state *ctdb_client_call_local_send(struct ctdb_db_context *ctdb_db, 
+								  struct ctdb_call *call,
+								  struct ctdb_ltdb_header *header,
+								  TDB_DATA *data)
+{
+	struct ctdb_client_call_state *state;
+	struct ctdb_context *ctdb = ctdb_db->ctdb;
+	int ret;
+
+	state = talloc_zero(ctdb_db, struct ctdb_client_call_state);
+	CTDB_NO_MEMORY_NULL(ctdb, state);
+
+	talloc_steal(state, data->dptr);
+
+	state->state = CTDB_CALL_DONE;
+	state->call = *call;
+	state->ctdb_db = ctdb_db;
+
+	ret = ctdb_call_local(ctdb_db, &state->call, header, state, data, ctdb->vnn);
+
+	return state;
+}
+
+/*
+  make a ctdb call to the local daemon - async send. Called from client context.
+
+  This constructs a ctdb_call request and queues it for processing. 
+  This call never blocks.
+*/
+struct ctdb_client_call_state *ctdb_call_send(struct ctdb_db_context *ctdb_db, 
+				       struct ctdb_call *call)
+{
+	struct ctdb_client_call_state *state;
+	struct ctdb_context *ctdb = ctdb_db->ctdb;
+	struct ctdb_ltdb_header header;
+	TDB_DATA data;
+	int ret;
+	size_t len;
+	struct ctdb_req_call *c;
+
+	/* if the domain socket is not yet open, open it */
+	if (ctdb->daemon.sd==-1) {
+		ctdb_socket_connect(ctdb);
+	}
+
+	ret = ctdb_ltdb_lock(ctdb_db, call->key);
+	if (ret != 0) {
+		DEBUG(0,(__location__ " Failed to get chainlock\n"));
+		return NULL;
+	}
+
+	ret = ctdb_ltdb_fetch(ctdb_db, call->key, &header, ctdb_db, &data);
+
+	if (ret == 0 && header.dmaster == ctdb->vnn) {
+		state = ctdb_client_call_local_send(ctdb_db, call, &header, &data);
+		talloc_free(data.dptr);
+		ctdb_ltdb_unlock(ctdb_db, call->key);
+		return state;
+	}
+
+	ctdb_ltdb_unlock(ctdb_db, call->key);
+	talloc_free(data.dptr);
+
+	state = talloc_zero(ctdb_db, struct ctdb_client_call_state);
+	if (state == NULL) {
+		DEBUG(0, (__location__ " failed to allocate state\n"));
+		return NULL;
+	}
+
+	len = offsetof(struct ctdb_req_call, data) + call->key.dsize + call->call_data.dsize;
+	c = ctdbd_allocate_pkt(ctdb, state, CTDB_REQ_CALL, len, struct ctdb_req_call);
+	if (c == NULL) {
+		DEBUG(0, (__location__ " failed to allocate packet\n"));
+		return NULL;
+	}
+
+	state->reqid     = ctdb_reqid_new(ctdb, state);
+	state->ctdb_db = ctdb_db;
+	talloc_set_destructor(state, ctdb_client_call_destructor);
+
+	c->hdr.reqid     = state->reqid;
+	c->flags         = call->flags;
+	c->db_id         = ctdb_db->db_id;
+	c->callid        = call->call_id;
+	c->hopcount      = 0;
+	c->keylen        = call->key.dsize;
+	c->calldatalen   = call->call_data.dsize;
+	memcpy(&c->data[0], call->key.dptr, call->key.dsize);
+	memcpy(&c->data[call->key.dsize], 
+	       call->call_data.dptr, call->call_data.dsize);
+	state->call                = *call;
+	state->call.call_data.dptr = &c->data[call->key.dsize];
+	state->call.key.dptr       = &c->data[0];
+
+	state->state  = CTDB_CALL_WAIT;
+
+
+	ctdb_client_queue_pkt(ctdb, &c->hdr);
+
+	return state;
+}
+
+
+/*
+  full ctdb_call. Equivalent to a ctdb_call_send() followed by a ctdb_call_recv()
+*/
+int ctdb_call(struct ctdb_db_context *ctdb_db, struct ctdb_call *call)
+{
+	struct ctdb_client_call_state *state;
+
+	state = ctdb_call_send(ctdb_db, call);
+	return ctdb_call_recv(state, call);
+}
+
+
+/*
+  tell the daemon what messaging srvid we will use, and register the message
+  handler function in the client
+*/
+int ctdb_set_message_handler(struct ctdb_context *ctdb, uint64_t srvid, 
+			     ctdb_message_fn_t handler,
+			     void *private_data)
+				    
+{
+	int res;
+	int32_t status;
+	
+	res = ctdb_control(ctdb, CTDB_CURRENT_NODE, srvid, CTDB_CONTROL_REGISTER_SRVID, 0, 
+			   tdb_null, NULL, NULL, &status, NULL, NULL);
+	if (res != 0 || status != 0) {
+		DEBUG(0,("Failed to register srvid %llu\n", (unsigned long long)srvid));
+		return -1;
+	}
+
+	/* also need to register the handler with our own ctdb structure */
+	return ctdb_register_message_handler(ctdb, ctdb, srvid, handler, private_data);
+}
+
+/*
+  tell the daemon we no longer want a srvid
+*/
+int ctdb_remove_message_handler(struct ctdb_context *ctdb, uint64_t srvid, void *private_data)
+{
+	int res;
+	int32_t status;
+	
+	res = ctdb_control(ctdb, CTDB_CURRENT_NODE, srvid, CTDB_CONTROL_DEREGISTER_SRVID, 0, 
+			   tdb_null, NULL, NULL, &status, NULL, NULL);
+	if (res != 0 || status != 0) {
+		DEBUG(0,("Failed to deregister srvid %llu\n", (unsigned long long)srvid));
+		return -1;
+	}
+
+	/* also need to register the handler with our own ctdb structure */
+	ctdb_deregister_message_handler(ctdb, srvid, private_data);
+	return 0;
+}
+
+
+/*
+  send a message - from client context
+ */
+int ctdb_send_message(struct ctdb_context *ctdb, uint32_t vnn,
+		      uint64_t srvid, TDB_DATA data)
+{
+	struct ctdb_req_message *r;
+	int len, res;
+
+	len = offsetof(struct ctdb_req_message, data) + data.dsize;
+	r = ctdbd_allocate_pkt(ctdb, ctdb, CTDB_REQ_MESSAGE, 
+			       len, struct ctdb_req_message);
+	CTDB_NO_MEMORY(ctdb, r);
+
+	r->hdr.destnode  = vnn;
+	r->srvid         = srvid;
+	r->datalen       = data.dsize;
+	memcpy(&r->data[0], data.dptr, data.dsize);
+	
+	res = ctdb_client_queue_pkt(ctdb, &r->hdr);
+	if (res != 0) {
+		return res;
+	}
+
+	talloc_free(r);
+	return 0;
+}
+
+
+/*
+  cancel a ctdb_fetch_lock operation, releasing the lock
+ */
+static int fetch_lock_destructor(struct ctdb_record_handle *h)
+{
+	ctdb_ltdb_unlock(h->ctdb_db, h->key);
+	return 0;
+}
+
+/*
+  force the migration of a record to this node
+ */
+static int ctdb_client_force_migration(struct ctdb_db_context *ctdb_db, TDB_DATA key)
+{
+	struct ctdb_call call;
+	ZERO_STRUCT(call);
+	call.call_id = CTDB_NULL_FUNC;
+	call.key = key;
+	call.flags = CTDB_IMMEDIATE_MIGRATION;
+	return ctdb_call(ctdb_db, &call);
+}
+
+/*
+  get a lock on a record, and return the records data. Blocks until it gets the lock
+ */
+struct ctdb_record_handle *ctdb_fetch_lock(struct ctdb_db_context *ctdb_db, TALLOC_CTX *mem_ctx, 
+					   TDB_DATA key, TDB_DATA *data)
+{
+	int ret;
+	struct ctdb_record_handle *h;
+
+	/*
+	  procedure is as follows:
+
+	  1) get the chain lock. 
+	  2) check if we are dmaster
+	  3) if we are the dmaster then return handle 
+	  4) if not dmaster then ask ctdb daemon to make us dmaster, and wait for
+	     reply from ctdbd
+	  5) when we get the reply, goto (1)
+	 */
+
+	h = talloc_zero(mem_ctx, struct ctdb_record_handle);
+	if (h == NULL) {
+		return NULL;
+	}
+
+	h->ctdb_db = ctdb_db;
+	h->key     = key;
+	h->key.dptr = talloc_memdup(h, key.dptr, key.dsize);
+	if (h->key.dptr == NULL) {
+		talloc_free(h);
+		return NULL;
+	}
+	h->data    = data;
+
+	DEBUG(3,("ctdb_fetch_lock: key=%*.*s\n", (int)key.dsize, (int)key.dsize, 
+		 (const char *)key.dptr));
+
+again:
+	/* step 1 - get the chain lock */
+	ret = ctdb_ltdb_lock(ctdb_db, key);
+	if (ret != 0) {
+		DEBUG(0, (__location__ " failed to lock ltdb record\n"));
+		talloc_free(h);
+		return NULL;
+	}
+
+	DEBUG(4,("ctdb_fetch_lock: got chain lock\n"));
+
+	talloc_set_destructor(h, fetch_lock_destructor);
+
+	ret = ctdb_ltdb_fetch(ctdb_db, key, &h->header, h, data);
+
+	/* when torturing, ensure we test the remote path */
+	if ((ctdb_db->ctdb->flags & CTDB_FLAG_TORTURE) &&
+	    random() % 5 == 0) {
+		h->header.dmaster = (uint32_t)-1;
+	}
+
+
+	DEBUG(4,("ctdb_fetch_lock: done local fetch\n"));
+
+	if (ret != 0 || h->header.dmaster != ctdb_db->ctdb->vnn) {
+		ctdb_ltdb_unlock(ctdb_db, key);
+		ret = ctdb_client_force_migration(ctdb_db, key);
+		if (ret != 0) {
+			DEBUG(4,("ctdb_fetch_lock: force_migration failed\n"));
+			talloc_free(h);
+			return NULL;
+		}
+		goto again;
+	}
+
+	DEBUG(4,("ctdb_fetch_lock: we are dmaster - done\n"));
+	return h;
+}
+
+/*
+  store some data to the record that was locked with ctdb_fetch_lock()
+*/
+int ctdb_record_store(struct ctdb_record_handle *h, TDB_DATA data)
+{
+	return ctdb_ltdb_store(h->ctdb_db, h->key, &h->header, data);
+}
+
+struct ctdb_client_control_state {
+	struct ctdb_context *ctdb;
+	uint32_t reqid;
+	int32_t status;
+	TDB_DATA outdata;
+	enum call_state state;
+	char *errormsg;
+};
+
+/*
+  called when a CTDB_REPLY_CONTROL packet comes in in the client
+
+  This packet comes in response to a CTDB_REQ_CONTROL request packet. It
+  contains any reply data from the control
+*/
+static void ctdb_client_reply_control(struct ctdb_context *ctdb, 
+				      struct ctdb_req_header *hdr)
+{
+	struct ctdb_reply_control *c = (struct ctdb_reply_control *)hdr;
+	struct ctdb_client_control_state *state;
+
+	state = ctdb_reqid_find(ctdb, hdr->reqid, struct ctdb_client_control_state);
+	if (state == NULL) {
+		DEBUG(0,(__location__ " reqid %u not found\n", hdr->reqid));
+		return;
+	}
+
+	if (hdr->reqid != state->reqid) {
+		/* we found a record  but it was the wrong one */
+		DEBUG(0, ("Dropped orphaned reply control with reqid:%u\n",hdr->reqid));
+		return;
+	}
+
+	state->outdata.dptr = c->data;
+	state->outdata.dsize = c->datalen;
+	state->status = c->status;
+	if (c->errorlen) {
+		state->errormsg = talloc_strndup(state, 
+						 (char *)&c->data[c->datalen], 
+						 c->errorlen);
+	}
+
+	talloc_steal(state, c);
+
+	state->state = CTDB_CALL_DONE;
+}
+
+
+/* time out handler for ctdb_control */
+static void timeout_func(struct event_context *ev, struct timed_event *te, 
+	struct timeval t, void *private_data)
+{
+	uint32_t *timed_out = (uint32_t *)private_data;
+
+	*timed_out = 1;
+}
+
+/*
+  destroy a ctdb_control in client
+*/
+static int ctdb_control_destructor(struct ctdb_client_control_state *state)	
+{
+	ctdb_reqid_remove(state->ctdb, state->reqid);
+	return 0;
+}
+
+/*
+  send a ctdb control message
+  timeout specifies how long we should wait for a reply.
+  if timeout is NULL we wait indefinitely
+ */
+int ctdb_control(struct ctdb_context *ctdb, uint32_t destnode, uint64_t srvid, 
+		 uint32_t opcode, uint32_t flags, TDB_DATA data, 
+		 TALLOC_CTX *mem_ctx, TDB_DATA *outdata, int32_t *status,
+		 struct timeval *timeout,
+		 char **errormsg)
+{
+	struct ctdb_client_control_state *state;
+	struct ctdb_req_control *c;
+	size_t len;
+	int ret;
+	uint32_t timed_out;
+
+	if (errormsg) {
+		*errormsg = NULL;
+	}
+
+	/* if the domain socket is not yet open, open it */
+	if (ctdb->daemon.sd==-1) {
+		ctdb_socket_connect(ctdb);
+	}
+
+	state = talloc_zero(ctdb, struct ctdb_client_control_state);
+	CTDB_NO_MEMORY(ctdb, state);
+
+	state->ctdb  = ctdb;
+	state->reqid = ctdb_reqid_new(ctdb, state);
+	state->state = CTDB_CALL_WAIT;
+	state->errormsg = NULL;
+
+	talloc_set_destructor(state, ctdb_control_destructor);
+
+	len = offsetof(struct ctdb_req_control, data) + data.dsize;
+	c = ctdbd_allocate_pkt(ctdb, state, CTDB_REQ_CONTROL, 
+			       len, struct ctdb_req_control);
+	CTDB_NO_MEMORY(ctdb, c);
+	
+	c->hdr.reqid        = state->reqid;
+	c->hdr.destnode     = destnode;
+	c->hdr.reqid        = state->reqid;
+	c->opcode           = opcode;
+	c->client_id        = 0;
+	c->flags            = flags;
+	c->srvid            = srvid;
+	c->datalen          = data.dsize;
+	if (data.dsize) {
+		memcpy(&c->data[0], data.dptr, data.dsize);
+	}
+
+	ret = ctdb_client_queue_pkt(ctdb, &(c->hdr));
+	if (ret != 0) {
+		talloc_free(state);
+		return -1;
+	}
+
+	if (flags & CTDB_CTRL_FLAG_NOREPLY) {
+		talloc_free(state);
+		return 0;
+	}
+
+	/* semi-async operation */
+	timed_out = 0;
+	if (timeout && !timeval_is_zero(timeout)) {
+		event_add_timed(ctdb->ev, state, *timeout, timeout_func, &timed_out);
+	}
+	while ((state->state == CTDB_CALL_WAIT)
+	&&	(timed_out == 0) ){
+		event_loop_once(ctdb->ev);
+	}
+	if (timed_out) {
+		talloc_free(state);
+		if (errormsg) {
+			(*errormsg) = talloc_strdup(mem_ctx, "control timed out");
+		} else {
+			DEBUG(0,("ctdb_control timed out\n"));
+		}
+		return -1;
+	}
+
+	if (outdata) {
+		*outdata = state->outdata;
+		outdata->dptr = talloc_memdup(mem_ctx, outdata->dptr, outdata->dsize);
+	}
+
+	*status = state->status;
+
+	if (!errormsg && state->errormsg) {
+		DEBUG(0,("ctdb_control error: '%s'\n", state->errormsg));
+	}
+
+	if (errormsg && state->errormsg) {
+		(*errormsg) = talloc_move(mem_ctx, &state->errormsg);
+	}
+
+	talloc_free(state);
+
+	return 0;	
+}
+
+
+
+/*
+  a process exists call. Returns 0 if process exists, -1 otherwise
+ */
+int ctdb_ctrl_process_exists(struct ctdb_context *ctdb, uint32_t destnode, pid_t pid)
+{
+	int ret;
+	TDB_DATA data;
+	int32_t status;
+
+	data.dptr = (uint8_t*)&pid;
+	data.dsize = sizeof(pid);
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_PROCESS_EXISTS, 0, data, 
+			   NULL, NULL, &status, NULL, NULL);
+	if (ret != 0) {
+		DEBUG(0,(__location__ " ctdb_control for process_exists failed\n"));
+		return -1;
+	}
+
+	return status;
+}
+
+/*
+  get remote statistics
+ */
+int ctdb_ctrl_statistics(struct ctdb_context *ctdb, uint32_t destnode, struct ctdb_statistics *status)
+{
+	int ret;
+	TDB_DATA data;
+	int32_t res;
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_STATISTICS, 0, tdb_null, 
+			   ctdb, &data, &res, NULL, NULL);
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control for statistics failed\n"));
+		return -1;
+	}
+
+	if (data.dsize != sizeof(struct ctdb_statistics)) {
+		DEBUG(0,(__location__ " Wrong statistics size %u - expected %u\n",
+			 (unsigned)data.dsize, (unsigned)sizeof(struct ctdb_statistics)));
+		      return -1;
+	}
+
+	*status = *(struct ctdb_statistics *)data.dptr;
+	talloc_free(data.dptr);
+			
+	return 0;
+}
+
+/*
+  shutdown a remote ctdb node
+ */
+int ctdb_ctrl_shutdown(struct ctdb_context *ctdb, struct timeval timeout, uint32_t destnode)
+{
+	int ret;
+	int32_t res;
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_SHUTDOWN, CTDB_CTRL_FLAG_NOREPLY, tdb_null, 
+			   NULL, NULL, &res, &timeout, NULL);
+	if (ret != 0) {
+		DEBUG(0,(__location__ " ctdb_control for shutdown failed\n"));
+		return -1;
+	}
+
+	return 0;
+}
+
+/*
+  get vnn map from a remote node
+ */
+int ctdb_ctrl_getvnnmap(struct ctdb_context *ctdb, struct timeval timeout, uint32_t destnode, TALLOC_CTX *mem_ctx, struct ctdb_vnn_map **vnnmap)
+{
+	int ret;
+	TDB_DATA outdata;
+	int32_t res;
+	struct ctdb_vnn_map_wire *map;
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_GETVNNMAP, 0, tdb_null, 
+			   mem_ctx, &outdata, &res, &timeout, NULL);
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control for getvnnmap failed\n"));
+		return -1;
+	}
+	
+	map = (struct ctdb_vnn_map_wire *)outdata.dptr;
+	if (outdata.dsize < offsetof(struct ctdb_vnn_map_wire, map) ||
+	    outdata.dsize != map->size*sizeof(uint32_t) + offsetof(struct ctdb_vnn_map_wire, map)) {
+		DEBUG(0,("Bad vnn map size received in ctdb_ctrl_getvnnmap\n"));
+		return -1;
+	}
+
+	(*vnnmap) = talloc(mem_ctx, struct ctdb_vnn_map);
+	CTDB_NO_MEMORY(ctdb, *vnnmap);
+	(*vnnmap)->generation = map->generation;
+	(*vnnmap)->size       = map->size;
+	(*vnnmap)->map        = talloc_array(*vnnmap, uint32_t, map->size);
+
+	CTDB_NO_MEMORY(ctdb, (*vnnmap)->map);
+	memcpy((*vnnmap)->map, map->map, sizeof(uint32_t)*map->size);
+	talloc_free(outdata.dptr);
+		    
+	return 0;
+}
+
+/*
+  get the recovery mode of a remote node
+ */
+int ctdb_ctrl_getrecmode(struct ctdb_context *ctdb, struct timeval timeout, uint32_t destnode, uint32_t *recmode)
+{
+	int ret;
+	int32_t res;
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_GET_RECMODE, 0, tdb_null, 
+			   NULL, NULL, &res, &timeout, NULL);
+	if (ret != 0) {
+		DEBUG(0,(__location__ " ctdb_control for getrecmode failed\n"));
+		return -1;
+	}
+
+	*recmode = res;
+
+	return 0;
+}
+
+/*
+  set the recovery mode of a remote node
+ */
+int ctdb_ctrl_setrecmode(struct ctdb_context *ctdb, struct timeval timeout, uint32_t destnode, uint32_t recmode)
+{
+	int ret;
+	TDB_DATA data;
+	int32_t res;
+
+	data.dsize = sizeof(uint32_t);
+	data.dptr = (unsigned char *)&recmode;
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_SET_RECMODE, 0, data, 
+			   NULL, NULL, &res, &timeout, NULL);
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control for setrecmode failed\n"));
+		return -1;
+	}
+
+	return 0;
+}
+
+/*
+  get the recovery master of a remote node
+ */
+int ctdb_ctrl_getrecmaster(struct ctdb_context *ctdb, struct timeval timeout, uint32_t destnode, uint32_t *recmaster)
+{
+	int ret;
+	int32_t res;
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_GET_RECMASTER, 0, tdb_null, 
+			   NULL, NULL, &res, &timeout, NULL);
+	if (ret != 0) {
+		DEBUG(0,(__location__ " ctdb_control for getrecmaster failed\n"));
+		return -1;
+	}
+
+	*recmaster = res;
+
+	return 0;
+}
+
+/*
+  set the recovery master of a remote node
+ */
+int ctdb_ctrl_setrecmaster(struct ctdb_context *ctdb, struct timeval timeout, uint32_t destnode, uint32_t recmaster)
+{
+	int ret;
+	TDB_DATA data;
+	int32_t res;
+
+	ZERO_STRUCT(data);
+	data.dsize = sizeof(uint32_t);
+	data.dptr = (unsigned char *)&recmaster;
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_SET_RECMASTER, 0, data, 
+			   NULL, NULL, &res, &timeout, NULL);
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control for setrecmaster failed\n"));
+		return -1;
+	}
+
+	return 0;
+}
+
+
+/*
+  get a list of databases off a remote node
+ */
+int ctdb_ctrl_getdbmap(struct ctdb_context *ctdb, struct timeval timeout, uint32_t destnode, 
+		       TALLOC_CTX *mem_ctx, struct ctdb_dbid_map **dbmap)
+{
+	int ret;
+	TDB_DATA outdata;
+	int32_t res;
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_GET_DBMAP, 0, tdb_null, 
+			   mem_ctx, &outdata, &res, &timeout, NULL);
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control for getdbmap failed\n"));
+		return -1;
+	}
+
+	*dbmap = (struct ctdb_dbid_map *)talloc_memdup(mem_ctx, outdata.dptr, outdata.dsize);
+	talloc_free(outdata.dptr);
+		    
+	return 0;
+}
+
+
+/*
+  get a list of nodes (vnn and flags ) from a remote node
+ */
+int ctdb_ctrl_getnodemap(struct ctdb_context *ctdb, 
+		struct timeval timeout, uint32_t destnode, 
+		TALLOC_CTX *mem_ctx, struct ctdb_node_map **nodemap)
+{
+	int ret;
+	TDB_DATA outdata;
+	int32_t res;
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_GET_NODEMAP, 0, tdb_null, 
+			   mem_ctx, &outdata, &res, &timeout, NULL);
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control for getnodes failed\n"));
+		return -1;
+	}
+
+	*nodemap = (struct ctdb_node_map *)talloc_memdup(mem_ctx, outdata.dptr, outdata.dsize);
+	talloc_free(outdata.dptr);
+		    
+	return 0;
+}
+
+/*
+  set vnn map on a node
+ */
+int ctdb_ctrl_setvnnmap(struct ctdb_context *ctdb, struct timeval timeout, uint32_t destnode, 
+			TALLOC_CTX *mem_ctx, struct ctdb_vnn_map *vnnmap)
+{
+	int ret;
+	TDB_DATA data;
+	int32_t res;
+	struct ctdb_vnn_map_wire *map;
+	size_t len;
+
+	len = offsetof(struct ctdb_vnn_map_wire, map) + sizeof(uint32_t)*vnnmap->size;
+	map = talloc_size(mem_ctx, len);
+	CTDB_NO_MEMORY_VOID(ctdb, map);
+
+	map->generation = vnnmap->generation;
+	map->size = vnnmap->size;
+	memcpy(map->map, vnnmap->map, sizeof(uint32_t)*map->size);
+	
+	data.dsize = len;
+	data.dptr  = (uint8_t *)map;
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_SETVNNMAP, 0, data, 
+			   NULL, NULL, &res, &timeout, NULL);
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control for setvnnmap failed\n"));
+		return -1;
+	}
+
+	talloc_free(map);
+
+	return 0;
+}
+
+/*
+  get all keys and records for a specific database
+ */
+int ctdb_ctrl_pulldb(struct ctdb_context *ctdb, uint32_t destnode, uint32_t dbid, uint32_t lmaster, 
+		     TALLOC_CTX *mem_ctx, struct ctdb_key_list *keys)
+{
+	int i, ret;
+	TDB_DATA indata, outdata;
+	struct ctdb_control_pulldb pull;
+	struct ctdb_control_pulldb_reply *reply;
+	struct ctdb_rec_data *rec;
+	int32_t res;
+
+	pull.db_id   = dbid;
+	pull.lmaster = lmaster;
+
+	indata.dsize = sizeof(struct ctdb_control_pulldb);
+	indata.dptr  = (unsigned char *)&pull;
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_PULL_DB, 0, indata, 
+			   mem_ctx, &outdata, &res, NULL, NULL);
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control for pulldb failed\n"));
+		return -1;
+	}
+
+
+	reply = (struct ctdb_control_pulldb_reply *)outdata.dptr;
+	keys->dbid     = reply->db_id;
+	keys->num      = reply->count;
+	
+	keys->keys     = talloc_array(mem_ctx, TDB_DATA, keys->num);
+	keys->headers  = talloc_array(mem_ctx, struct ctdb_ltdb_header, keys->num);
+	keys->data     = talloc_array(mem_ctx, TDB_DATA, keys->num);
+
+	rec = (struct ctdb_rec_data *)&reply->data[0];
+
+	for (i=0;i<reply->count;i++) {
+		keys->keys[i].dptr = talloc_memdup(mem_ctx, &rec->data[0], rec->keylen);
+		keys->keys[i].dsize = rec->keylen;
+		
+		keys->data[i].dptr = talloc_memdup(mem_ctx, &rec->data[keys->keys[i].dsize], rec->datalen);
+		keys->data[i].dsize = rec->datalen;
+
+		if (keys->data[i].dsize < sizeof(struct ctdb_ltdb_header)) {
+			DEBUG(0,(__location__ " bad ltdb record\n"));
+			return -1;
+		}
+		memcpy(&keys->headers[i], keys->data[i].dptr, sizeof(struct ctdb_ltdb_header));
+		keys->data[i].dptr += sizeof(struct ctdb_ltdb_header);
+		keys->data[i].dsize -= sizeof(struct ctdb_ltdb_header);
+
+		rec = (struct ctdb_rec_data *)(rec->length + (uint8_t *)rec);
+	}	    
+
+	talloc_free(outdata.dptr);
+
+	return 0;
+}
+
+/*
+  copy a tdb from one node to another node
+ */
+int ctdb_ctrl_copydb(struct ctdb_context *ctdb, struct timeval timeout, uint32_t sourcenode, 
+		     uint32_t destnode, uint32_t dbid, uint32_t lmaster, TALLOC_CTX *mem_ctx)
+{
+	int ret;
+	TDB_DATA indata, outdata;
+	int32_t res;
+
+	indata.dsize = 2*sizeof(uint32_t);
+	indata.dptr  = (unsigned char *)talloc_array(mem_ctx, uint32_t, 2);
+
+	((uint32_t *)(&indata.dptr[0]))[0] = dbid;
+	((uint32_t *)(&indata.dptr[0]))[1] = lmaster;
+
+	DEBUG(3,("pulling dbid 0x%x from %u\n", dbid, sourcenode));
+
+	ret = ctdb_control(ctdb, sourcenode, 0, 
+			   CTDB_CONTROL_PULL_DB, 0, indata, 
+			   mem_ctx, &outdata, &res, &timeout, NULL);
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control for pulldb failed\n"));
+		return -1;
+	}
+
+	DEBUG(3,("pushing dbid 0x%x to %u\n", dbid, destnode));
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_PUSH_DB, 0, outdata, 
+			   mem_ctx, NULL, &res, &timeout, NULL);
+	talloc_free(outdata.dptr);
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control for pushdb failed\n"));
+		return -1;
+	}
+
+	DEBUG(3,("copydb for dbid 0x%x done for %u to %u\n", 
+		 dbid, sourcenode, destnode));
+
+	return 0;
+}
+
+/*
+  change dmaster for all keys in the database to the new value
+ */
+int ctdb_ctrl_setdmaster(struct ctdb_context *ctdb, struct timeval timeout, uint32_t destnode, 
+			 TALLOC_CTX *mem_ctx, uint32_t dbid, uint32_t dmaster)
+{
+	int ret;
+	TDB_DATA indata;
+	int32_t res;
+
+	indata.dsize = 2*sizeof(uint32_t);
+	indata.dptr = (unsigned char *)talloc_array(mem_ctx, uint32_t, 2);
+
+	((uint32_t *)(&indata.dptr[0]))[0] = dbid;
+	((uint32_t *)(&indata.dptr[0]))[1] = dmaster;
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_SET_DMASTER, 0, indata, 
+			   NULL, NULL, &res, &timeout, NULL);
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control for setdmaster failed\n"));
+		return -1;
+	}
+
+	return 0;
+}
+
+/*
+  ping a node, return number of clients connected
+ */
+int ctdb_ctrl_ping(struct ctdb_context *ctdb, uint32_t destnode)
+{
+	int ret;
+	int32_t res;
+
+	ret = ctdb_control(ctdb, destnode, 0, CTDB_CONTROL_PING, 0, 
+			   tdb_null, NULL, NULL, &res, NULL, NULL);
+	if (ret != 0) {
+		return -1;
+	}
+	return res;
+}
+
+/*
+  find the real path to a ltdb 
+ */
+int ctdb_ctrl_getdbpath(struct ctdb_context *ctdb, struct timeval timeout, uint32_t destnode, uint32_t dbid, TALLOC_CTX *mem_ctx, 
+		   const char **path)
+{
+	int ret;
+	int32_t res;
+	TDB_DATA data;
+
+	data.dptr = (uint8_t *)&dbid;
+	data.dsize = sizeof(dbid);
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_GETDBPATH, 0, data, 
+			   mem_ctx, &data, &res, &timeout, NULL);
+	if (ret != 0 || res != 0) {
+		return -1;
+	}
+
+	(*path) = talloc_strndup(mem_ctx, (const char *)data.dptr, data.dsize);
+	if ((*path) == NULL) {
+		return -1;
+	}
+
+	talloc_free(data.dptr);
+
+	return 0;
+}
+
+/*
+  find the name of a db 
+ */
+int ctdb_ctrl_getdbname(struct ctdb_context *ctdb, struct timeval timeout, uint32_t destnode, uint32_t dbid, TALLOC_CTX *mem_ctx, 
+		   const char **name)
+{
+	int ret;
+	int32_t res;
+	TDB_DATA data;
+
+	data.dptr = (uint8_t *)&dbid;
+	data.dsize = sizeof(dbid);
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_GET_DBNAME, 0, data, 
+			   mem_ctx, &data, &res, &timeout, NULL);
+	if (ret != 0 || res != 0) {
+		return -1;
+	}
+
+	(*name) = talloc_strndup(mem_ctx, (const char *)data.dptr, data.dsize);
+	if ((*name) == NULL) {
+		return -1;
+	}
+
+	talloc_free(data.dptr);
+
+	return 0;
+}
+
+/*
+  create a database
+ */
+int ctdb_ctrl_createdb(struct ctdb_context *ctdb, struct timeval timeout, uint32_t destnode, TALLOC_CTX *mem_ctx, const char *name)
+{
+	int ret;
+	int32_t res;
+	TDB_DATA data;
+
+	data.dptr = discard_const(name);
+	data.dsize = strlen(name)+1;
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_DB_ATTACH, 0, data, 
+			   mem_ctx, &data, &res, &timeout, NULL);
+
+	if (ret != 0 || res != 0) {
+		return -1;
+	}
+
+	return 0;
+}
+
+/*
+  get debug level on a node
+ */
+int ctdb_ctrl_get_debuglevel(struct ctdb_context *ctdb, uint32_t destnode, uint32_t *level)
+{
+	int ret;
+	int32_t res;
+	TDB_DATA data;
+
+	ret = ctdb_control(ctdb, destnode, 0, CTDB_CONTROL_GET_DEBUG, 0, tdb_null, 
+			   ctdb, &data, &res, NULL, NULL);
+	if (ret != 0 || res != 0) {
+		return -1;
+	}
+	if (data.dsize != sizeof(uint32_t)) {
+		DEBUG(0,("Bad control reply size in ctdb_get_debuglevel (got %u)\n",
+			 (unsigned)data.dsize));
+		return -1;
+	}
+	*level = *(uint32_t *)data.dptr;
+	talloc_free(data.dptr);
+	return 0;
+}
+
+/*
+  set debug level on a node
+ */
+int ctdb_ctrl_set_debuglevel(struct ctdb_context *ctdb, uint32_t destnode, uint32_t level)
+{
+	int ret;
+	int32_t res;
+	TDB_DATA data;
+
+	data.dptr = (uint8_t *)&level;
+	data.dsize = sizeof(level);
+
+	ret = ctdb_control(ctdb, destnode, 0, CTDB_CONTROL_SET_DEBUG, 0, data, 
+			   NULL, NULL, &res, NULL, NULL);
+	if (ret != 0 || res != 0) {
+		return -1;
+	}
+	return 0;
+}
+
+
+/*
+  get a list of connected nodes
+ */
+uint32_t *ctdb_get_connected_nodes(struct ctdb_context *ctdb, 
+				struct timeval timeout,
+				TALLOC_CTX *mem_ctx,
+				uint32_t *num_nodes)
+{
+	struct ctdb_node_map *map=NULL;
+	int ret, i;
+	uint32_t *nodes;
+
+	*num_nodes = 0;
+
+	ret = ctdb_ctrl_getnodemap(ctdb, timeout, CTDB_CURRENT_NODE, mem_ctx, &map);
+	if (ret != 0) {
+		return NULL;
+	}
+
+	nodes = talloc_array(mem_ctx, uint32_t, map->num);
+	if (nodes == NULL) {
+		return NULL;
+	}
+
+	for (i=0;i<map->num;i++) {
+		if (!(map->nodes[i].flags & NODE_FLAGS_DISCONNECTED)) {
+			nodes[*num_nodes] = map->nodes[i].vnn;
+			(*num_nodes)++;
+		}
+	}
+
+	return nodes;
+}
+
+
+/*
+  reset remote status
+ */
+int ctdb_statistics_reset(struct ctdb_context *ctdb, uint32_t destnode)
+{
+	int ret;
+	int32_t res;
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_STATISTICS_RESET, 0, tdb_null, 
+			   NULL, NULL, &res, NULL, NULL);
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control for reset statistics failed\n"));
+		return -1;
+	}
+	return 0;
+}
+
+
+/*
+  attach to a specific database - client call
+*/
+struct ctdb_db_context *ctdb_attach(struct ctdb_context *ctdb, const char *name)
+{
+	struct ctdb_db_context *ctdb_db;
+	TDB_DATA data;
+	int ret;
+	int32_t res;
+
+	ctdb_db = talloc_zero(ctdb, struct ctdb_db_context);
+	CTDB_NO_MEMORY_NULL(ctdb, ctdb_db);
+
+	ctdb_db->ctdb = ctdb;
+	ctdb_db->db_name = talloc_strdup(ctdb_db, name);
+	CTDB_NO_MEMORY_NULL(ctdb, ctdb_db->db_name);
+
+	data.dptr = discard_const(name);
+	data.dsize = strlen(name)+1;
+
+	/* tell ctdb daemon to attach */
+	ret = ctdb_control(ctdb, CTDB_CURRENT_NODE, 0, CTDB_CONTROL_DB_ATTACH,
+			   0, data, ctdb_db, &data, &res, NULL, NULL);
+	if (ret != 0 || res != 0 || data.dsize != sizeof(uint32_t)) {
+		DEBUG(0,("Failed to attach to database '%s'\n", name));
+		talloc_free(ctdb_db);
+		return NULL;
+	}
+	
+	ctdb_db->db_id = *(uint32_t *)data.dptr;
+	talloc_free(data.dptr);
+
+	ret = ctdb_ctrl_getdbpath(ctdb, timeval_current_ofs(2, 0), CTDB_CURRENT_NODE, ctdb_db->db_id, ctdb_db, &ctdb_db->db_path);
+	if (ret != 0) {
+		DEBUG(0,("Failed to get dbpath for database '%s'\n", name));
+		talloc_free(ctdb_db);
+		return NULL;
+	}
+
+	ctdb_db->ltdb = tdb_wrap_open(ctdb, ctdb_db->db_path, 0, 0, O_RDWR, 0);
+	if (ctdb_db->ltdb == NULL) {
+		ctdb_set_error(ctdb, "Failed to open tdb '%s'\n", ctdb_db->db_path);
+		talloc_free(ctdb_db);
+		return NULL;
+	}
+
+	DLIST_ADD(ctdb->db_list, ctdb_db);
+
+	return ctdb_db;
+}
+
+
+/*
+  setup a call for a database
+ */
+int ctdb_set_call(struct ctdb_db_context *ctdb_db, ctdb_fn_t fn, uint32_t id)
+{
+	TDB_DATA data;
+	int32_t status;
+	struct ctdb_control_set_call c;
+	int ret;
+	struct ctdb_registered_call *call;
+
+	c.db_id = ctdb_db->db_id;
+	c.fn    = fn;
+	c.id    = id;
+
+	data.dptr = (uint8_t *)&c;
+	data.dsize = sizeof(c);
+
+	ret = ctdb_control(ctdb_db->ctdb, CTDB_CURRENT_NODE, 0, CTDB_CONTROL_SET_CALL, 0,
+			   data, NULL, NULL, &status, NULL, NULL);
+	if (ret != 0 || status != 0) {
+		DEBUG(0,("ctdb_set_call failed for call %u\n", id));
+		return -1;
+	}
+
+	/* also register locally */
+	call = talloc(ctdb_db, struct ctdb_registered_call);
+	call->fn = fn;
+	call->id = id;
+
+	DLIST_ADD(ctdb_db->calls, call);	
+	return 0;
+}
+
+
+struct traverse_state {
+	bool done;
+	uint32_t count;
+	ctdb_traverse_func fn;
+	void *private_data;
+};
+
+/*
+  called on each key during a ctdb_traverse
+ */
+static void traverse_handler(struct ctdb_context *ctdb, uint64_t srvid, TDB_DATA data, void *p)
+{
+	struct traverse_state *state = (struct traverse_state *)p;
+	struct ctdb_rec_data *d = (struct ctdb_rec_data *)data.dptr;
+	TDB_DATA key;
+
+	if (data.dsize < sizeof(uint32_t) ||
+	    d->length != data.dsize) {
+		DEBUG(0,("Bad data size %u in traverse_handler\n", (unsigned)data.dsize));
+		state->done = True;
+		return;
+	}
+
+	key.dsize = d->keylen;
+	key.dptr  = &d->data[0];
+	data.dsize = d->datalen;
+	data.dptr = &d->data[d->keylen];
+
+	if (key.dsize == 0 && data.dsize == 0) {
+		/* end of traverse */
+		state->done = True;
+		return;
+	}
+
+	if (state->fn(ctdb, key, data, state->private_data) != 0) {
+		state->done = True;
+	}
+
+	state->count++;
+}
+
+
+/*
+  start a cluster wide traverse, calling the supplied fn on each record
+  return the number of records traversed, or -1 on error
+ */
+int ctdb_traverse(struct ctdb_db_context *ctdb_db, ctdb_traverse_func fn, void *private_data)
+{
+	TDB_DATA data;
+	struct ctdb_traverse_start t;
+	int32_t status;
+	int ret;
+	uint64_t srvid = (getpid() | 0xFLL<<60);
+	struct traverse_state state;
+
+	state.done = False;
+	state.count = 0;
+	state.private_data = private_data;
+	state.fn = fn;
+
+	ret = ctdb_set_message_handler(ctdb_db->ctdb, srvid, traverse_handler, &state);
+	if (ret != 0) {
+		DEBUG(0,("Failed to setup traverse handler\n"));
+		return -1;
+	}
+
+	t.db_id = ctdb_db->db_id;
+	t.srvid = srvid;
+	t.reqid = 0;
+
+	data.dptr = (uint8_t *)&t;
+	data.dsize = sizeof(t);
+
+	ret = ctdb_control(ctdb_db->ctdb, CTDB_CURRENT_NODE, 0, CTDB_CONTROL_TRAVERSE_START, 0,
+			   data, NULL, NULL, &status, NULL, NULL);
+	if (ret != 0 || status != 0) {
+		DEBUG(0,("ctdb_traverse_all failed\n"));
+		ctdb_remove_message_handler(ctdb_db->ctdb, srvid, &state);
+		return -1;
+	}
+
+	while (!state.done) {
+		event_loop_once(ctdb_db->ctdb->ev);
+	}
+
+	ret = ctdb_remove_message_handler(ctdb_db->ctdb, srvid, &state);
+	if (ret != 0) {
+		DEBUG(0,("Failed to remove ctdb_traverse handler\n"));
+		return -1;
+	}
+
+	return state.count;
+}
+
+/*
+  called on each key during a catdb
+ */
+static int dumpdb_fn(struct ctdb_context *ctdb, TDB_DATA key, TDB_DATA data, void *p)
+{
+	FILE *f = (FILE *)p;
+	char *keystr, *datastr;
+	struct ctdb_ltdb_header *h = (struct ctdb_ltdb_header *)data.dptr;
+
+	keystr  = hex_encode_talloc(ctdb, key.dptr, key.dsize);
+	datastr = hex_encode_talloc(ctdb, data.dptr+sizeof(*h), data.dsize-sizeof(*h));
+
+	fprintf(f, "dmaster: %u\n", h->dmaster);
+	fprintf(f, "rsn: %llu\n", (unsigned long long)h->rsn);
+	fprintf(f, "key: %s\ndata: %s\n", keystr, datastr);
+
+	talloc_free(keystr);
+	talloc_free(datastr);
+	return 0;
+}
+
+/*
+  convenience function to list all keys to stdout
+ */
+int ctdb_dump_db(struct ctdb_db_context *ctdb_db, FILE *f)
+{
+	return ctdb_traverse(ctdb_db, dumpdb_fn, f);
+}
+
+/*
+  get the pid of a ctdb daemon
+ */
+int ctdb_ctrl_getpid(struct ctdb_context *ctdb, struct timeval timeout, uint32_t destnode, uint32_t *pid)
+{
+	int ret;
+	int32_t res;
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_GET_PID, 0, tdb_null, 
+			   NULL, NULL, &res, &timeout, NULL);
+	if (ret != 0) {
+		DEBUG(0,(__location__ " ctdb_control for getpid failed\n"));
+		return -1;
+	}
+
+	*pid = res;
+
+	return 0;
+}
+
+
+/*
+  freeze a node
+ */
+int ctdb_ctrl_freeze(struct ctdb_context *ctdb, struct timeval timeout, uint32_t destnode)
+{
+	int ret;
+	int32_t res;
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_FREEZE, 0, tdb_null, 
+			   NULL, NULL, &res, &timeout, NULL);
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control freeze failed\n"));
+		return -1;
+	}
+
+	return 0;
+}
+
+/*
+  thaw a node
+ */
+int ctdb_ctrl_thaw(struct ctdb_context *ctdb, struct timeval timeout, uint32_t destnode)
+{
+	int ret;
+	int32_t res;
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_THAW, 0, tdb_null, 
+			   NULL, NULL, &res, &timeout, NULL);
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control thaw failed\n"));
+		return -1;
+	}
+
+	return 0;
+}
+
+/*
+  get vnn of a node, or -1
+ */
+int ctdb_ctrl_getvnn(struct ctdb_context *ctdb, struct timeval timeout, uint32_t destnode)
+{
+	int ret;
+	int32_t res;
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_GET_VNN, 0, tdb_null, 
+			   NULL, NULL, &res, &timeout, NULL);
+	if (ret != 0) {
+		DEBUG(0,(__location__ " ctdb_control for getvnn failed\n"));
+		return -1;
+	}
+
+	return res;
+}
+
+/*
+  set the monitoring mode of a remote node
+ */
+int ctdb_ctrl_setmonmode(struct ctdb_context *ctdb, struct timeval timeout, uint32_t destnode, uint32_t monmode)
+{
+	int ret;
+	TDB_DATA data;
+	int32_t res;
+
+	data.dsize = sizeof(uint32_t);
+	data.dptr = (uint8_t *)&monmode;
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_SET_MONMODE, 0, data, 
+			   NULL, NULL, &res, &timeout, NULL);
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control for setmonmode failed\n"));
+		return -1;
+	}
+
+	return 0;
+}
+
+/*
+  get the monitoring mode of a remote node
+ */
+int ctdb_ctrl_getmonmode(struct ctdb_context *ctdb, struct timeval timeout, uint32_t destnode, uint32_t *monmode)
+{
+	int ret;
+	int32_t res;
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_GET_MONMODE, 0, tdb_null, 
+			   NULL, NULL, &res, &timeout, NULL);
+	if (ret != 0) {
+		DEBUG(0,(__location__ " ctdb_control for getrecmode failed\n"));
+		return -1;
+	}
+
+	*monmode = res;
+
+	return 0;
+}
+
+
+/*
+  get maximum rsn for a db on a node
+ */
+int ctdb_ctrl_get_max_rsn(struct ctdb_context *ctdb, struct timeval timeout, 
+			  uint32_t destnode, uint32_t db_id, uint64_t *max_rsn)
+{
+	TDB_DATA data, outdata;
+	int ret;
+	int32_t res;
+
+	data.dptr = (uint8_t *)&db_id;
+	data.dsize = sizeof(db_id);
+
+	ret = ctdb_control(ctdb, destnode, 0, CTDB_CONTROL_MAX_RSN, 0, data, ctdb,
+			   &outdata, &res, &timeout, NULL);
+	if (ret != 0 || res != 0 || outdata.dsize != sizeof(uint64_t)) {
+		DEBUG(0,(__location__ " ctdb_control for get_max_rsn failed\n"));
+		return -1;
+	}
+
+	*max_rsn = *(uint64_t *)outdata.dptr;
+	talloc_free(outdata.dptr);
+
+	return 0;	
+}
+
+/*
+  set the rsn on non-empty records to the given rsn
+ */
+int ctdb_ctrl_set_rsn_nonempty(struct ctdb_context *ctdb, struct timeval timeout, 
+			       uint32_t destnode, uint32_t db_id, uint64_t rsn)
+{
+	TDB_DATA data;
+	int ret;
+	int32_t res;
+	struct ctdb_control_set_rsn_nonempty p;
+
+	p.db_id = db_id;
+	p.rsn = rsn;
+
+	data.dptr = (uint8_t *)&p;
+	data.dsize = sizeof(p);
+
+	ret = ctdb_control(ctdb, destnode, 0, CTDB_CONTROL_SET_RSN_NONEMPTY, 0, data, NULL,
+			   NULL, &res, &timeout, NULL);
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control for set_rsn_nonempty failed\n"));
+		return -1;
+	}
+
+	return 0;	
+}
+
+/*
+  delete records which have a rsn below the given rsn
+ */
+int ctdb_ctrl_delete_low_rsn(struct ctdb_context *ctdb, struct timeval timeout, 
+			     uint32_t destnode, uint32_t db_id, uint64_t rsn)
+{
+	TDB_DATA data;
+	int ret;
+	int32_t res;
+	struct ctdb_control_delete_low_rsn p;
+
+	p.db_id = db_id;
+	p.rsn = rsn;
+
+	data.dptr = (uint8_t *)&p;
+	data.dsize = sizeof(p);
+
+	ret = ctdb_control(ctdb, destnode, 0, CTDB_CONTROL_DELETE_LOW_RSN, 0, data, NULL,
+			   NULL, &res, &timeout, NULL);
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control for delete_low_rsn failed\n"));
+		return -1;
+	}
+
+	return 0;	
+}
+
+/* 
+  sent to a node to make it take over an ip address
+*/
+int ctdb_ctrl_takeover_ip(struct ctdb_context *ctdb, struct timeval timeout, 
+			  uint32_t destnode, struct ctdb_public_ip *ip)
+{
+	TDB_DATA data;
+	int ret;
+	int32_t res;
+
+	data.dsize = sizeof(*ip);
+	data.dptr  = (uint8_t *)ip;
+
+	ret = ctdb_control(ctdb, destnode, 0, CTDB_CONTROL_TAKEOVER_IP, 0, data, NULL,
+			   NULL, &res, &timeout, NULL);
+
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control for takeover_ip failed\n"));
+		return -1;
+	}
+
+	return 0;	
+}
+
+
+/* 
+  sent to a node to make it release an ip address
+*/
+int ctdb_ctrl_release_ip(struct ctdb_context *ctdb, struct timeval timeout, 
+			 uint32_t destnode, struct ctdb_public_ip *ip)
+{
+	TDB_DATA data;
+	int ret;
+	int32_t res;
+
+	data.dsize = sizeof(*ip);
+	data.dptr  = (uint8_t *)ip;
+
+	ret = ctdb_control(ctdb, destnode, 0, CTDB_CONTROL_RELEASE_IP, 0, data, NULL,
+			   NULL, &res, &timeout, NULL);
+
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control for release_ip failed\n"));
+		return -1;
+	}
+
+	return 0;	
+}
+
+
+/*
+  get a tunable
+ */
+int ctdb_ctrl_get_tunable(struct ctdb_context *ctdb, 
+			  struct timeval timeout, 
+			  uint32_t destnode,
+			  const char *name, uint32_t *value)
+{
+	struct ctdb_control_get_tunable *t;
+	TDB_DATA data, outdata;
+	int32_t res;
+	int ret;
+
+	data.dsize = offsetof(struct ctdb_control_get_tunable, name) + strlen(name) + 1;
+	data.dptr  = talloc_size(ctdb, data.dsize);
+	CTDB_NO_MEMORY(ctdb, data.dptr);
+
+	t = (struct ctdb_control_get_tunable *)data.dptr;
+	t->length = strlen(name)+1;
+	memcpy(t->name, name, t->length);
+
+	ret = ctdb_control(ctdb, destnode, 0, CTDB_CONTROL_GET_TUNABLE, 0, data, ctdb,
+			   &outdata, &res, &timeout, NULL);
+	talloc_free(data.dptr);
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control for get_tunable failed\n"));
+		return -1;
+	}
+
+	if (outdata.dsize != sizeof(uint32_t)) {
+		DEBUG(0,("Invalid return data in get_tunable\n"));
+		talloc_free(outdata.dptr);
+		return -1;
+	}
+	
+	*value = *(uint32_t *)outdata.dptr;
+	talloc_free(outdata.dptr);
+
+	return 0;
+}
+
+/*
+  set a tunable
+ */
+int ctdb_ctrl_set_tunable(struct ctdb_context *ctdb, 
+			  struct timeval timeout, 
+			  uint32_t destnode,
+			  const char *name, uint32_t value)
+{
+	struct ctdb_control_set_tunable *t;
+	TDB_DATA data;
+	int32_t res;
+	int ret;
+
+	data.dsize = offsetof(struct ctdb_control_set_tunable, name) + strlen(name) + 1;
+	data.dptr  = talloc_size(ctdb, data.dsize);
+	CTDB_NO_MEMORY(ctdb, data.dptr);
+
+	t = (struct ctdb_control_set_tunable *)data.dptr;
+	t->length = strlen(name)+1;
+	memcpy(t->name, name, t->length);
+	t->value = value;
+
+	ret = ctdb_control(ctdb, destnode, 0, CTDB_CONTROL_SET_TUNABLE, 0, data, NULL,
+			   NULL, &res, &timeout, NULL);
+	talloc_free(data.dptr);
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control for set_tunable failed\n"));
+		return -1;
+	}
+
+	return 0;
+}
+
+/*
+  list tunables
+ */
+int ctdb_ctrl_list_tunables(struct ctdb_context *ctdb, 
+			    struct timeval timeout, 
+			    uint32_t destnode,
+			    TALLOC_CTX *mem_ctx,
+			    const char ***list, uint32_t *count)
+{
+	TDB_DATA outdata;
+	int32_t res;
+	int ret;
+	struct ctdb_control_list_tunable *t;
+	char *p, *s, *ptr;
+
+	ret = ctdb_control(ctdb, destnode, 0, CTDB_CONTROL_LIST_TUNABLES, 0, tdb_null, 
+			   mem_ctx, &outdata, &res, &timeout, NULL);
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control for list_tunables failed\n"));
+		return -1;
+	}
+
+	t = (struct ctdb_control_list_tunable *)outdata.dptr;
+	if (outdata.dsize < offsetof(struct ctdb_control_list_tunable, data) ||
+	    t->length > outdata.dsize-offsetof(struct ctdb_control_list_tunable, data)) {
+		DEBUG(0,("Invalid data in list_tunables reply\n"));
+		talloc_free(outdata.dptr);
+		return -1;		
+	}
+	
+	p = talloc_strndup(mem_ctx, (char *)t->data, t->length);
+	CTDB_NO_MEMORY(ctdb, p);
+
+	talloc_free(outdata.dptr);
+	
+	(*list) = NULL;
+	(*count) = 0;
+
+	for (s=strtok_r(p, ":", &ptr); s; s=strtok_r(NULL, ":", &ptr)) {
+		(*list) = talloc_realloc(mem_ctx, *list, const char *, 1+(*count));
+		CTDB_NO_MEMORY(ctdb, *list);
+		(*list)[*count] = talloc_strdup(*list, s);
+		CTDB_NO_MEMORY(ctdb, (*list)[*count]);
+		(*count)++;
+	}
+
+	talloc_free(p);
+
+	return 0;
+}
+
+
+int ctdb_ctrl_get_public_ips(struct ctdb_context *ctdb, 
+			struct timeval timeout, uint32_t destnode, 
+			TALLOC_CTX *mem_ctx, struct ctdb_all_public_ips **ips)
+{
+	int ret;
+	TDB_DATA outdata;
+	int32_t res;
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_GET_PUBLIC_IPS, 0, tdb_null, 
+			   mem_ctx, &outdata, &res, &timeout, NULL);
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control for getpublicips failed\n"));
+		return -1;
+	}
+
+	*ips = (struct ctdb_all_public_ips *)talloc_memdup(mem_ctx, outdata.dptr, outdata.dsize);
+	talloc_free(outdata.dptr);
+		    
+	return 0;
+}
+
+/*
+  set/clear the permanent disabled bit on a remote node
+ */
+int ctdb_ctrl_modflags(struct ctdb_context *ctdb, struct timeval timeout, uint32_t destnode, 
+		       uint32_t set, uint32_t clear)
+{
+	int ret;
+	TDB_DATA data;
+	struct ctdb_node_modflags m;
+	int32_t res;
+
+	m.set = set;
+	m.clear = clear;
+
+	data.dsize = sizeof(m);
+	data.dptr = (unsigned char *)&m;
+
+	ret = ctdb_control(ctdb, destnode, 0, 
+			   CTDB_CONTROL_MODIFY_FLAGS, 0, data, 
+			   NULL, NULL, &res, &timeout, NULL);
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control for modflags failed\n"));
+		return -1;
+	}
+
+	return 0;
+}
+
+
+/*
+  get all tunables
+ */
+int ctdb_ctrl_get_all_tunables(struct ctdb_context *ctdb, 
+			       struct timeval timeout, 
+			       uint32_t destnode,
+			       struct ctdb_tunable *tunables)
+{
+	TDB_DATA outdata;
+	int ret;
+	int32_t res;
+
+	ret = ctdb_control(ctdb, destnode, 0, CTDB_CONTROL_GET_ALL_TUNABLES, 0, tdb_null, ctdb,
+			   &outdata, &res, &timeout, NULL);
+	if (ret != 0 || res != 0) {
+		DEBUG(0,(__location__ " ctdb_control for get all tunables failed\n"));
+		return -1;
+	}
+
+	if (outdata.dsize != sizeof(*tunables)) {
+		DEBUG(0,(__location__ " bad data size %u in ctdb_ctrl_get_all_tunables should be %u\n",
+			 (unsigned)outdata.dsize, (unsigned)sizeof(*tunables)));
+		return -1;		
+	}
+
+	*tunables = *(struct ctdb_tunable *)outdata.dptr;
+	talloc_free(outdata.dptr);
+	return 0;
+}
+
+
+/*
+  initialise the ctdb daemon for client applications
+
+  NOTE: In current code the daemon does not fork. This is for testing purposes only
+  and to simplify the code.
+*/
+struct ctdb_context *ctdb_init(struct event_context *ev)
+{
+	struct ctdb_context *ctdb;
+
+	ctdb = talloc_zero(ev, struct ctdb_context);
+	ctdb->ev  = ev;
+	ctdb->idr = idr_init(ctdb);
+	CTDB_NO_MEMORY_NULL(ctdb, ctdb->idr);
+
+	return ctdb;
+}
+
+
+/*
+  set some ctdb flags
+*/
+void ctdb_set_flags(struct ctdb_context *ctdb, unsigned flags)
+{
+	ctdb->flags |= flags;
+}
+
+/*
+  setup the local socket name
+*/
+int ctdb_set_socketname(struct ctdb_context *ctdb, const char *socketname)
+{
+	ctdb->daemon.name = talloc_strdup(ctdb, socketname);
+	return 0;
+}
+
+/*
+  return the vnn of this node
+*/
+uint32_t ctdb_get_vnn(struct ctdb_context *ctdb)
+{
+	return ctdb->vnn;
+}
+