Add the early start of an async ldap library

There's a lot of things this does not do yet: For example it does not parse the
reply blob in the sasl bind, it does not do anything with controls yet, a lot
of the ldap requests are not covered yet. But it provides a basis for me to
play with a pdb_ads passdb module.

4 files changed, 2075 insertions, 0 deletions

diff --git a/source3/Makefile.in b/source3/Makefile.in
index 7229cea01d..1b23a342b5 100644
--- a/source3/Makefile.in
+++ b/source3/Makefile.in
@@ -477,6 +477,8 @@ CLDAP_OBJ = libads/cldap.o \
 	../lib/util/idtree.o \
 	$(LIBCLI_LDAP_MESSAGE_OBJ) $(LIBCLI_LDAP_NDR_OBJ) $(LIBTSOCKET_OBJ)
 
+TLDAP_OBJ = lib/tldap.o
+
 LIBSMB_OBJ = libsmb/clientgen.o libsmb/cliconnect.o libsmb/clifile.o \
 	     libsmb/clikrb5.o libsmb/clispnego.o ../lib/util/asn1.o \
 	     libsmb/clirap.o libsmb/clierror.o libsmb/climessage.o \
diff --git a/source3/include/includes.h b/source3/include/includes.h
index e468bd5c38..41f1b4eeeb 100644
--- a/source3/include/includes.h
+++ b/source3/include/includes.h
@@ -684,6 +684,7 @@ struct smb_iconv_convenience *lp_iconv_convenience(void *lp_ctx);
 #include "eventlog.h"
 #include "../lib/util/smb_threads.h"
 #include "../lib/util/smb_threads_internal.h"
+#include "tldap.h"
 
 #include "lib/smbconf/smbconf.h"
 #include "lib/smbconf/smbconf_init.h"
diff --git a/source3/include/tldap.h b/source3/include/tldap.h
new file mode 100644
index 0000000000..2cf2230701
--- /dev/null
+++ b/source3/include/tldap.h
@@ -0,0 +1,237 @@
+/*
+   Unix SMB/CIFS implementation.
+   Infrastructure for async ldap client requests
+   Copyright (C) Volker Lendecke 2009
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __TLDAP_H__
+#define __TLDAP_H__
+
+#include <talloc.h>
+#include <tevent.h>
+
+struct tldap_context;
+struct tldap_message;
+
+struct tldap_control {
+	const char *oid;
+	struct berval value;
+	bool iscritical;
+};
+
+struct tldap_attribute {
+	char *name;
+	int num_values;
+	DATA_BLOB *values;
+};
+
+struct tldap_mod {
+	int mod_op;
+	char *attribute;
+	int num_values;
+	DATA_BLOB *values;
+};
+
+struct tldap_context *tldap_context_create(TALLOC_CTX *mem_ctx, int fd);
+
+struct tevent_req *tldap_sasl_bind_send(TALLOC_CTX *mem_ctx,
+					struct tevent_context *ev,
+					struct tldap_context *ld,
+					const char *dn,
+					const char *mechanism,
+					DATA_BLOB *creds,
+					struct tldap_control **sctrls,
+					struct tldap_control **cctrls);
+int tldap_sasl_bind_recv(struct tevent_req *req);
+int tldap_sasl_bind(struct tldap_context *ldap,
+		    const char *dn,
+		    const char *mechanism,
+		    DATA_BLOB *creds,
+		    struct tldap_control **sctrls,
+		    struct tldap_control **cctrls);
+
+struct tevent_req *tldap_simple_bind_send(TALLOC_CTX *mem_ctx,
+					  struct tevent_context *ev,
+					  struct tldap_context *ldap,
+					  const char *dn,
+					  const char *passwd);
+int tldap_simple_bind_recv(struct tevent_req *req);
+int tldap_simple_bind(struct tldap_context *ldap, const char *dn,
+		      const char *passwd);
+
+struct tevent_req *tldap_search_send(TALLOC_CTX *mem_ctx,
+				     struct tevent_context *ev,
+				     struct tldap_context *ld,
+				     const char *base, int scope,
+				     const char *filter,
+				     const char **attrs,
+				     int num_attrs,
+				     int attrsonly,
+				     struct tldap_control **sctrls,
+				     struct tldap_control **cctrls,
+				     int timelimit,
+				     int sizelimit,
+				     int deref);
+int tldap_search_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+		      struct tldap_message **pmsg);
+int tldap_search(struct tldap_context *ld,
+		 const char *base, int scope, const char *filter,
+		 const char **attrs, int num_attrs, int attrsonly,
+		 struct tldap_control **sctrls, struct tldap_control **cctrls,
+		 int timelimit, int sizelimit, int deref,
+		 TALLOC_CTX *mem_ctx, struct tldap_message ***pentries,
+		 struct tldap_message ***refs);
+bool tldap_entry_dn(struct tldap_message *msg, char **dn);
+bool tldap_entry_attributes(struct tldap_message *msg, int *num_attributes,
+			    struct tldap_attribute **attributes);
+
+struct tevent_req *tldap_add_send(TALLOC_CTX *mem_ctx,
+				  struct tevent_context *ev,
+				  struct tldap_context *ld,
+				  const char *dn,
+				  int num_attributes,
+				  struct tldap_mod *attributes,
+				  struct tldap_control **sctrls,
+				  struct tldap_control **cctrls);
+int tldap_add_recv(struct tevent_req *req);
+int tldap_add(struct tldap_context *ld, const char *dn,
+	      int num_attributes, struct tldap_mod *attributes,
+	      struct tldap_control **sctrls, struct tldap_control **cctrls);
+
+struct tevent_req *tldap_modify_send(TALLOC_CTX *mem_ctx,
+				     struct tevent_context *ev,
+				     struct tldap_context *ld,
+				     const char *dn,
+				     int num_mods, struct tldap_mod *mods,
+				     struct tldap_control **sctrls,
+				     struct tldap_control **cctrls);
+int tldap_modify_recv(struct tevent_req *req);
+int tldap_modify(struct tldap_context *ld, const char *dn,
+		 int num_mods, struct tldap_mod *mods,
+		 struct tldap_control **sctrls, struct tldap_control **cctrls);
+
+
+struct tevent_req *tldap_delete_send(TALLOC_CTX *mem_ctx,
+				     struct tevent_context *ev,
+				     struct tldap_context *ld,
+				     const char *dn,
+				     struct tldap_control **sctrls,
+				     struct tldap_control **cctrls);
+int tldap_delete_recv(struct tevent_req *req);
+int tldap_delete(struct tldap_context *ld, const char *dn,
+		 struct tldap_control **sctrls, struct tldap_control **cctrls);
+
+
+int tldap_msg_id(const struct tldap_message *msg);
+int tldap_msg_type(const struct tldap_message *msg);
+const char *tldap_req_matcheddn(struct tevent_req *req);
+const char *tldap_req_diagnosticmessage(struct tevent_req *req);
+const char *tldap_req_referral(struct tevent_req *req);
+const char *tldap_ctx_matcheddn(struct tldap_context *ctx);
+const char *tldap_ctx_diagnosticmessage(struct tldap_context *ctx);
+const char *tldap_ctx_referral(struct tldap_context *ctx);
+const char *tldap_err2string(int rc);
+
+#define TLDAP_REQ_BIND (0)
+#define TLDAP_RES_BIND (1)
+#define TLDAP_REQ_UNBIND (2)
+#define TLDAP_REQ_SEARCH (3)
+#define TLDAP_RES_SEARCH_ENTRY (4)
+#define TLDAP_RES_SEARCH_RESULT (5)
+#define TLDAP_REQ_MODIFY (6)
+#define TLDAP_RES_MODIFY (7)
+#define TLDAP_REQ_ADD (8)
+#define TLDAP_RES_ADD (9)
+#define TLDAP_REQ_DELETE (10)
+#define TLDAP_RES_DELETE (11)
+#define TLDAP_REQ_MODDN (12)
+#define TLDAP_RES_MODDN (13)
+#define TLDAP_REQ_COMPARE (14)
+#define TLDAP_RES_COMPARE (15)
+#define TLDAP_REQ_ABANDON (16)
+#define TLDAP_RES_SEARCH_REFERENCE (19)
+#define TLDAP_REQ_EXTENDED (23)
+#define TLDAP_RES_EXTENDED (24)
+#define TLDAP_RES_INTERMEDIATE (25)
+
+#define TLDAP_SUCCESS (0x00)
+#define TLDAP_OPERATIONS_ERROR (0x01)
+#define TLDAP_PROTOCOL_ERROR (0x02)
+#define TLDAP_TIMELIMIT_EXCEEDED (0x03)
+#define TLDAP_SIZELIMIT_EXCEEDED (0x04)
+#define TLDAP_COMPARE_FALSE (0x05)
+#define TLDAP_COMPARE_TRUE (0x06)
+#define TLDAP_STRONG_AUTH_NOT_SUPPORTED (0x07)
+#define TLDAP_STRONG_AUTH_REQUIRED (0x08)
+#define TLDAP_REFERRAL (0x0a)
+#define TLDAP_ADMINLIMIT_EXCEEDED (0x0b)
+#define TLDAP_UNAVAILABLE_CRITICAL_EXTENSION (0x0c)
+#define TLDAP_CONFIDENTIALITY_REQUIRED (0x0d)
+#define TLDAP_SASL_BIND_IN_PROGRESS (0x0e)
+#define TLDAP_NO_SUCH_ATTRIBUTE (0x10)
+#define TLDAP_UNDEFINED_TYPE (0x11)
+#define TLDAP_INAPPROPRIATE_MATCHING (0x12)
+#define TLDAP_CONSTRAINT_VIOLATION (0x13)
+#define TLDAP_TYPE_OR_VALUE_EXISTS (0x14)
+#define TLDAP_INVALID_SYNTAX (0x15)
+#define TLDAP_NO_SUCH_OBJECT (0x20)
+#define TLDAP_ALIAS_PROBLEM (0x21)
+#define TLDAP_INVALID_DN_SYNTAX (0x22)
+#define TLDAP_IS_LEAF (0x23)
+#define TLDAP_ALIAS_DEREF_PROBLEM (0x24)
+#define TLDAP_INAPPROPRIATE_AUTH (0x30)
+#define TLDAP_INVALID_CREDENTIALS (0x31)
+#define TLDAP_INSUFFICIENT_ACCESS (0x32)
+#define TLDAP_BUSY (0x33)
+#define TLDAP_UNAVAILABLE (0x34)
+#define TLDAP_UNWILLING_TO_PERFORM (0x35)
+#define TLDAP_LOOP_DETECT (0x36)
+#define TLDAP_NAMING_VIOLATION (0x40)
+#define TLDAP_OBJECT_CLASS_VIOLATION (0x41)
+#define TLDAP_NOT_ALLOWED_ON_NONLEAF (0x42)
+#define TLDAP_NOT_ALLOWED_ON_RDN (0x43)
+#define TLDAP_ALREADY_EXISTS (0x44)
+#define TLDAP_NO_OBJECT_CLASS_MODS (0x45)
+#define TLDAP_RESULTS_TOO_LARGE (0x46)
+#define TLDAP_AFFECTS_MULTIPLE_DSAS (0x47)
+#define TLDAP_OTHER (0x50)
+#define TLDAP_SERVER_DOWN (0x51)
+#define TLDAP_LOCAL_ERROR (0x52)
+#define TLDAP_ENCODING_ERROR (0x53)
+#define TLDAP_DECODING_ERROR (0x54)
+#define TLDAP_TIMEOUT (0x55)
+#define TLDAP_AUTH_UNKNOWN (0x56)
+#define TLDAP_FILTER_ERROR (0x57)
+#define TLDAP_USER_CANCELLED (0x58)
+#define TLDAP_PARAM_ERROR (0x59)
+#define TLDAP_NO_MEMORY (0x5a)
+#define TLDAP_CONNECT_ERROR (0x5b)
+#define TLDAP_NOT_SUPPORTED (0x5c)
+#define TLDAP_CONTROL_NOT_FOUND (0x5d)
+#define TLDAP_NO_RESULTS_RETURNED (0x5e)
+#define TLDAP_MORE_RESULTS_TO_RETURN (0x5f)
+#define TLDAP_CLIENT_LOOP (0x60)
+#define TLDAP_REFERRAL_LIMIT_EXCEEDED (0x61)
+
+#define TLDAP_MOD_ADD (0)
+#define TLDAP_MOD_DELETE (1)
+#define TLDAP_MOD_REPLACE (2)
+
+#define TLDAP_SCOPE_BASE (0)
+#define TLDAP_SCOPE_ONE (1)
+#define TLDAP_SCOPE_SUB (2)
+
+#endif
diff --git a/source3/lib/tldap.c b/source3/lib/tldap.c
new file mode 100644
index 0000000000..2012441d98
--- /dev/null
+++ b/source3/lib/tldap.c
@@ -0,0 +1,1835 @@
+/*
+   Unix SMB/CIFS implementation.
+   Infrastructure for async ldap client requests
+   Copyright (C) Volker Lendecke 2009
+
+   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"
+
+static bool tevent_req_is_ldap_error(struct tevent_req *req, int *perr)
+{
+	enum tevent_req_state state;
+	uint64_t err;
+
+	if (!tevent_req_is_error(req, &state, &err)) {
+		return false;
+	}
+	switch (state) {
+	case TEVENT_REQ_TIMED_OUT:
+		*perr = TLDAP_TIMEOUT;
+		break;
+	case TEVENT_REQ_NO_MEMORY:
+		*perr = TLDAP_NO_MEMORY;
+		break;
+	case TEVENT_REQ_USER_ERROR:
+		*perr = err;
+		break;
+	default:
+		*perr = TLDAP_OPERATIONS_ERROR;
+		break;
+	}
+	return true;
+}
+
+struct tldap_context {
+	int ld_version;
+	int ld_deref;
+	int ld_sizelimit;
+	int ld_timelimit;
+	int fd;
+	int msgid;
+	struct tevent_queue *outgoing;
+	struct tevent_req **pending;
+
+	/* For the sync wrappers we need something like get_last_error... */
+	int lderr;
+	char *res_matcheddn;
+	char *res_diagnosticmessage;
+	char *res_referral;
+};
+
+struct tldap_message {
+	struct asn1_data *data;
+	uint8_t *inbuf;
+	int type;
+	int id;
+
+	/* RESULT_ENTRY */
+	char *dn;
+	struct tldap_attribute *attribs;
+};
+
+static int tldap_next_msgid(struct tldap_context *ld)
+{
+	int result;
+
+	result = ld->msgid++;
+	if (ld->msgid == 2147483647) {
+		ld->msgid = 1;
+	}
+	return result;
+}
+
+struct tldap_context *tldap_context_create(TALLOC_CTX *mem_ctx, int fd)
+{
+	struct tldap_context *ctx;
+
+	ctx = talloc_zero(mem_ctx, struct tldap_context);
+	if (ctx == NULL) {
+		return NULL;
+	}
+	ctx->fd = fd;
+	ctx->msgid = 1;
+	ctx->ld_version = 3;
+	ctx->outgoing = tevent_queue_create(ctx, "tldap_outgoing");
+	if (ctx->outgoing == NULL) {
+		TALLOC_FREE(ctx);
+		return NULL;
+	}
+	return ctx;
+}
+
+struct read_ldap_state {
+	uint8_t *buf;
+	bool done;
+};
+
+static ssize_t read_ldap_more(uint8_t *buf, size_t buflen, void *private_data)
+{
+	struct read_ldap_state *state = talloc_get_type_abort(
+		private_data, struct read_ldap_state);
+	size_t len;
+	int i, lensize;
+
+	if (state->done) {
+		/* We've been here, we're done */
+		return 0;
+	}
+
+	/*
+	 * From ldap.h: LDAP_TAG_MESSAGE is 0x30
+	 */
+	if (buf[0] != 0x30) {
+		return -1;
+	}
+
+	len = buf[1];
+	if ((len & 0x80) == 0) {
+		state->done = true;
+		return len;
+	}
+
+	lensize = (len & 0x7f);
+	len = 0;
+
+	if (buflen == 2) {
+		/* Please get us the full length */
+		return lensize;
+	}
+	if (buflen > 2 + lensize) {
+		state->done = true;
+		return 0;
+	}
+	if (buflen != 2 + lensize) {
+		return -1;
+	}
+
+	for (i=0; i<lensize; i++) {
+		len = (len << 8) | buf[2+i];
+	}
+	return len;
+}
+
+static void read_ldap_done(struct tevent_req *subreq);
+
+static struct tevent_req *read_ldap_send(TALLOC_CTX *mem_ctx,
+					 struct tevent_context *ev,
+					 int fd)
+{
+	struct tevent_req *req, *subreq;
+	struct read_ldap_state *state;
+
+	req = tevent_req_create(mem_ctx, &state, struct read_ldap_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->done = false;
+
+	subreq = read_packet_send(state, ev, fd, 2, read_ldap_more, state);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, read_ldap_done, req);
+	return req;
+}
+
+static void read_ldap_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct read_ldap_state *state = tevent_req_data(
+		req, struct read_ldap_state);
+	ssize_t nread;
+	int err;
+
+	nread = read_packet_recv(subreq, state, &state->buf, &err);
+	TALLOC_FREE(subreq);
+	if (nread == -1) {
+		tevent_req_error(req, err);
+		return;
+	}
+	tevent_req_done(req);
+}
+
+static ssize_t read_ldap_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			      uint8_t **pbuf, int *perrno)
+{
+	struct read_ldap_state *state = tevent_req_data(
+		req, struct read_ldap_state);
+
+	if (tevent_req_is_unix_error(req, perrno)) {
+		return -1;
+	}
+	*pbuf = talloc_move(mem_ctx, &state->buf);
+	return talloc_get_size(*pbuf);
+}
+
+static bool asn1_blob(const struct asn1_data *asn1, DATA_BLOB *blob)
+{
+	if (asn1->has_error) {
+		return false;
+	}
+	if (asn1->nesting != NULL) {
+		return false;
+	}
+	blob->data = asn1->data;
+	blob->length = asn1->length;
+	return true;
+}
+
+static void asn1_load_nocopy(struct asn1_data *data, uint8_t *buf, size_t len)
+{
+	ZERO_STRUCTP(data);
+	data->data = buf;
+	data->length = len;
+}
+
+struct tldap_msg_state {
+	struct tldap_context *ld;
+	struct tevent_context *ev;
+	int id;
+	struct iovec iov;
+
+	struct asn1_data *data;
+	uint8_t *inbuf;
+};
+
+static void tldap_msg_sent(struct tevent_req *subreq);
+static void tldap_msg_received(struct tevent_req *subreq);
+
+static struct tevent_req *tldap_msg_send(TALLOC_CTX *mem_ctx,
+					 struct tevent_context *ev,
+					 struct tldap_context *ld,
+					 int id, struct asn1_data *data)
+{
+	struct tevent_req *req, *subreq;
+	struct tldap_msg_state *state;
+	DATA_BLOB blob;
+
+	req = tevent_req_create(mem_ctx, &state, struct tldap_msg_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->ld = ld;
+	state->ev = ev;
+	state->id = id;
+
+	asn1_pop_tag(data);
+
+	if (!asn1_blob(data, &blob)) {
+		tevent_req_error(req, TLDAP_ENCODING_ERROR);
+		return tevent_req_post(req, ev);
+	}
+
+	state->iov.iov_base = blob.data;
+	state->iov.iov_len = blob.length;
+
+	subreq = writev_send(state, ev, ld->outgoing, ld->fd, false,
+			     &state->iov, 1);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, tldap_msg_sent, req);
+	return req;
+}
+
+static void tldap_msg_unset_pending(struct tevent_req *req)
+{
+	struct tldap_msg_state *state = tevent_req_data(
+		req, struct tldap_msg_state);
+	struct tldap_context *ld = state->ld;
+	int num_pending = talloc_array_length(ld->pending);
+	int i;
+
+	if (num_pending == 1) {
+		TALLOC_FREE(ld->pending);
+		return;
+	}
+
+	for (i=0; i<num_pending; i++) {
+		if (req == ld->pending[i]) {
+			break;
+		}
+	}
+	if (i == num_pending) {
+		/*
+		 * Something's seriously broken. Just returning here is the
+		 * right thing nevertheless, the point of this routine is to
+		 * remove ourselves from cli->pending.
+		 */
+		return;
+	}
+
+	/*
+	 * Remove ourselves from the cli->pending array
+	 */
+	if (num_pending > 1) {
+		ld->pending[i] = ld->pending[num_pending-1];
+	}
+
+	/*
+	 * No NULL check here, we're shrinking by sizeof(void *), and
+	 * talloc_realloc just adjusts the size for this.
+	 */
+	ld->pending = talloc_realloc(NULL, ld->pending, struct tevent_req *,
+				     num_pending - 1);
+	return;
+}
+
+static int tldap_msg_destructor(struct tevent_req *req)
+{
+	tldap_msg_unset_pending(req);
+	return 0;
+}
+
+static bool tldap_msg_set_pending(struct tevent_req *req)
+{
+	struct tldap_msg_state *state = tevent_req_data(
+		req, struct tldap_msg_state);
+	struct tldap_context *ld;
+	struct tevent_req **pending;
+	int num_pending;
+	struct tevent_req *subreq;
+
+	ld = state->ld;
+	num_pending = talloc_array_length(ld->pending);
+
+	pending = talloc_realloc(ld, ld->pending, struct tevent_req *,
+				 num_pending+1);
+	if (pending == NULL) {
+		return false;
+	}
+	pending[num_pending] = req;
+	ld->pending = pending;
+	talloc_set_destructor(req, tldap_msg_destructor);
+
+	if (num_pending > 0) {
+		return true;
+	}
+
+	/*
+	 * We're the first ones, add the read_ldap request that waits for the
+	 * answer from the server
+	 */
+	subreq = read_ldap_send(ld->pending, state->ev, ld->fd);
+	if (subreq == NULL) {
+		tldap_msg_unset_pending(req);
+		return false;
+	}
+	tevent_req_set_callback(subreq, tldap_msg_received, ld);
+	return true;
+}
+
+static void tldap_msg_sent(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	ssize_t nwritten;
+	int err;
+
+	nwritten = writev_recv(subreq, &err);
+	TALLOC_FREE(subreq);
+	if (nwritten == -1) {
+		tevent_req_error(req, TLDAP_SERVER_DOWN);
+		return;
+	}
+
+	if (!tldap_msg_set_pending(req)) {
+		tevent_req_nomem(NULL, req);
+		return;
+	}
+}
+
+static int tldap_msg_msgid(struct tevent_req *req)
+{
+	struct tldap_msg_state *state = tevent_req_data(
+		req, struct tldap_msg_state);
+
+	return state->id;
+}
+
+static void tldap_msg_received(struct tevent_req *subreq)
+{
+	struct tldap_context *ld = tevent_req_callback_data(
+		subreq, struct tldap_context);
+	struct tevent_req *req;
+	struct tldap_msg_state *state;
+	struct tevent_context *ev;
+	struct asn1_data *data;
+	uint8_t *inbuf;
+	ssize_t received;
+	size_t num_pending;
+	int i, err, status;
+	int id;
+	bool ok;
+
+	received = read_ldap_recv(subreq, talloc_tos(), &inbuf, &err);
+	TALLOC_FREE(subreq);
+	if (received == -1) {
+		status = TLDAP_SERVER_DOWN;
+		goto fail;
+	}
+
+	data = asn1_init(talloc_tos());
+	if (data == NULL) {
+		status = TLDAP_NO_MEMORY;
+		goto fail;
+	}
+	asn1_load_nocopy(data, inbuf, received);
+
+	ok = true;
+	ok &= asn1_start_tag(data, ASN1_SEQUENCE(0));
+	ok &= asn1_read_Integer(data, &id);
+
+	if (!ok) {
+		status = TLDAP_PROTOCOL_ERROR;
+		goto fail;
+	}
+
+	num_pending = talloc_array_length(ld->pending);
+
+	for (i=0; i<num_pending; i++) {
+		if (id == tldap_msg_msgid(ld->pending[i])) {
+			break;
+		}
+	}
+	if (i == num_pending) {
+		/* Dump unexpected reply */
+		TALLOC_FREE(inbuf);
+		goto done;
+	}
+
+	req = ld->pending[i];
+	state = tevent_req_data(req, struct tldap_msg_state);
+
+	state->inbuf = talloc_move(state, &inbuf);
+	state->data = talloc_move(state, &data);
+
+	ev = state->ev;
+
+	talloc_set_destructor(req, NULL);
+	tldap_msg_destructor(req);
+	tevent_req_done(req);
+
+ done:
+	if (talloc_array_length(ld->pending) > 0) {
+		state = tevent_req_data(ld->pending[0],
+					struct tldap_msg_state);
+		subreq = read_ldap_send(ld->pending, state->ev, ld->fd);
+		if (subreq == NULL) {
+			status = TLDAP_NO_MEMORY;
+			goto fail;
+		}
+		tevent_req_set_callback(subreq, tldap_msg_received, ld);
+	}
+	return;
+
+ fail:
+	while (talloc_array_length(ld->pending) > 0) {
+		req = ld->pending[0];
+		talloc_set_destructor(req, NULL);
+		tldap_msg_destructor(req);
+		tevent_req_error(req, status);
+	}
+}
+
+static int tldap_msg_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			  struct tldap_message **pmsg)
+{
+	struct tldap_msg_state *state = tevent_req_data(
+		req, struct tldap_msg_state);
+	struct tldap_message *msg;
+	int err;
+	uint8_t msgtype;
+
+	if (tevent_req_is_ldap_error(req, &err)) {
+		return err;
+	}
+
+	if (!asn1_peek_uint8(state->data, &msgtype)) {
+		return TLDAP_PROTOCOL_ERROR;
+	}
+
+	if (pmsg == NULL) {
+		return TLDAP_SUCCESS;
+	}
+
+	msg = talloc_zero(mem_ctx, struct tldap_message);
+	if (msg == NULL) {
+		return TLDAP_NO_MEMORY;
+	}
+	msg->id = state->id;
+
+	msg->inbuf = talloc_move(msg, &state->inbuf);
+	msg->data = talloc_move(msg, &state->data);
+	msg->type = msgtype;
+
+	*pmsg = msg;
+	return TLDAP_SUCCESS;
+}
+
+struct tldap_req_state {
+	int id;
+	struct asn1_data *out;
+	struct tldap_message *result;
+
+	int lderr;
+	char *res_matcheddn;
+	char *res_diagnosticmessage;
+	char *res_referral;
+};
+
+static struct tevent_req *tldap_req_create(TALLOC_CTX *mem_ctx,
+					   struct tldap_context *ld,
+					   struct tldap_req_state **pstate)
+{
+	struct tevent_req *req;
+	struct tldap_req_state *state;
+
+	req = tevent_req_create(mem_ctx, &state, struct tldap_req_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	ZERO_STRUCTP(state);
+	state->out = asn1_init(state);
+	if (state->out == NULL) {
+		TALLOC_FREE(req);
+		return NULL;
+	}
+	state->result = NULL;
+	state->id = tldap_next_msgid(ld);
+
+	asn1_push_tag(state->out, ASN1_SEQUENCE(0));
+	asn1_write_Integer(state->out, state->id);
+
+	*pstate = state;
+	return req;
+}
+
+static void tldap_save_errors(struct tldap_context *ctx,
+			      struct tevent_req *req)
+{
+	struct tldap_req_state *state = tevent_req_data(
+		req, struct tldap_req_state);
+
+	TALLOC_FREE(ctx->res_matcheddn);
+	TALLOC_FREE(ctx->res_diagnosticmessage);
+	TALLOC_FREE(ctx->res_referral);
+
+	ctx->lderr = state->lderr;
+	ctx->res_matcheddn = talloc_move(ctx, &state->res_matcheddn);
+	ctx->res_diagnosticmessage = talloc_move(
+		ctx, &state->res_diagnosticmessage);
+	ctx->res_referral = talloc_move(ctx, &state->res_referral);
+}
+
+static char *blob2string_talloc(TALLOC_CTX *mem_ctx, DATA_BLOB blob)
+{
+	char *result = talloc_array(mem_ctx, char, blob.length+1);
+	memcpy(result, blob.data, blob.length);
+	result[blob.length] = '\0';
+	return result;
+}
+
+static bool asn1_read_OctetString_talloc(TALLOC_CTX *mem_ctx,
+					 struct asn1_data *data,
+					 char **result)
+{
+	DATA_BLOB string;
+	if (!asn1_read_OctetString(data, mem_ctx, &string))
+		return false;
+	*result = blob2string_talloc(mem_ctx, string);
+	data_blob_free(&string);
+	return true;
+}
+
+static bool tldap_decode_response(struct tldap_req_state *state)
+{
+	struct asn1_data *data = state->result->data;
+	bool ok = true;
+
+	ok &= asn1_read_enumerated(data, &state->lderr);
+	ok &= asn1_read_OctetString_talloc(state, data, &state->res_matcheddn);
+	ok &= asn1_read_OctetString_talloc(state, data,
+					   &state->res_diagnosticmessage);
+	if (asn1_peek_tag(data, ASN1_CONTEXT(3))) {
+		ok &= asn1_start_tag(data, ASN1_CONTEXT(3));
+		ok &= asn1_read_OctetString_talloc(
+			state, data, &state->res_referral);
+		ok &= asn1_end_tag(data);
+	} else {
+		state->res_referral = NULL;
+	}
+
+	return ok;
+}
+
+static void tldap_sasl_bind_done(struct tevent_req *subreq);
+
+struct tevent_req *tldap_sasl_bind_send(TALLOC_CTX *mem_ctx,
+					struct tevent_context *ev,
+					struct tldap_context *ld,
+					const char *dn,
+					const char *mechanism,
+					DATA_BLOB *creds,
+					struct tldap_control **sctrls,
+					struct tldap_control **cctrls)
+{
+	struct tevent_req *req, *subreq;
+	struct tldap_req_state *state;
+
+	req = tldap_req_create(mem_ctx, ld, &state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	if (dn == NULL) {
+		dn = "";
+	}
+
+	asn1_push_tag(state->out, TLDAP_REQ_BIND);
+	asn1_write_Integer(state->out, ld->ld_version);
+	asn1_write_OctetString(state->out, dn, (dn != NULL) ? strlen(dn) : 0);
+
+	if (mechanism == NULL) {
+		asn1_push_tag(state->out, ASN1_CONTEXT_SIMPLE(0));
+		asn1_write(state->out, creds->data, creds->length);
+		asn1_pop_tag(state->out);
+	} else {
+		asn1_push_tag(state->out, ASN1_CONTEXT(3));
+		asn1_write_OctetString(state->out, mechanism,
+				       strlen(mechanism));
+		if ((creds != NULL) && (creds->data != NULL)) {
+			asn1_write_OctetString(state->out, creds->data,
+					       creds->length);
+		}
+		asn1_pop_tag(state->out);
+	}
+
+	if (!asn1_pop_tag(state->out)) {
+		tevent_req_error(req, TLDAP_ENCODING_ERROR);
+		return tevent_req_post(req, ev);
+	}
+
+	subreq = tldap_msg_send(state, ev, ld, state->id, state->out);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, tldap_sasl_bind_done, req);
+	return req;
+}
+
+static void tldap_sasl_bind_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct tldap_req_state *state = tevent_req_data(
+		req, struct tldap_req_state);
+	int err;
+
+	err = tldap_msg_recv(subreq, state, &state->result);
+	TALLOC_FREE(subreq);
+	if (err != TLDAP_SUCCESS) {
+		tevent_req_error(req, err);
+		return;
+	}
+	if (state->result->type != TLDAP_RES_BIND) {
+		tevent_req_error(req, TLDAP_PROTOCOL_ERROR);
+		return;
+	}
+	if (!asn1_start_tag(state->result->data, state->result->type) ||
+	    !tldap_decode_response(state) ||
+	    !asn1_end_tag(state->result->data)) {
+		tevent_req_error(req, TLDAP_DECODING_ERROR);
+		return;
+	}
+	/*
+	 * TODO: pull the reply blob
+	 */
+	if (state->lderr != TLDAP_SUCCESS) {
+		tevent_req_error(req, state->lderr);
+		return;
+	}
+	tevent_req_done(req);
+}
+
+int tldap_sasl_bind_recv(struct tevent_req *req)
+{
+	int err;
+
+	if (tevent_req_is_ldap_error(req, &err)) {
+		return err;
+	}
+	return TLDAP_SUCCESS;
+}
+
+int tldap_sasl_bind(struct tldap_context *ld,
+		    const char *dn,
+		    const char *mechanism,
+		    DATA_BLOB *creds,
+		    struct tldap_control **sctrls,
+		    struct tldap_control **cctrls)
+{
+	TALLOC_CTX *frame = talloc_stackframe();
+	struct tevent_context *ev;
+	struct tevent_req *req;
+	int result;
+
+	ev = event_context_init(frame);
+	if (ev == NULL) {
+		result = TLDAP_NO_MEMORY;
+		goto fail;
+	}
+
+	req = tldap_sasl_bind_send(frame, ev, ld, dn, mechanism, creds,
+				   sctrls, cctrls);
+	if (req == NULL) {
+		result = TLDAP_NO_MEMORY;
+		goto fail;
+	}
+
+	if (!tevent_req_poll(req, ev)) {
+		result = TLDAP_OPERATIONS_ERROR;
+		goto fail;
+	}
+
+	result = tldap_sasl_bind_recv(req);
+	tldap_save_errors(ld, req);
+ fail:
+	TALLOC_FREE(frame);
+	return result;
+}
+
+struct tevent_req *tldap_simple_bind_send(TALLOC_CTX *mem_ctx,
+					  struct tevent_context *ev,
+					  struct tldap_context *ld,
+					  const char *dn,
+					  const char *passwd)
+{
+	DATA_BLOB cred;
+
+	if (passwd != NULL) {
+		cred.data = (uint8_t *)passwd;
+		cred.length = strlen(passwd);
+	} else {
+		cred.data = (uint8_t *)"";
+		cred.length = 0;
+	}
+	return tldap_sasl_bind_send(mem_ctx, ev, ld, dn, NULL, &cred, NULL,
+				    NULL);
+}
+
+int tldap_simple_bind_recv(struct tevent_req *req)
+{
+	return tldap_sasl_bind_recv(req);
+}
+
+int tldap_simple_bind(struct tldap_context *ld, const char *dn,
+		      const char *passwd)
+{
+	DATA_BLOB cred;
+
+	if (passwd != NULL) {
+		cred.data = (uint8_t *)passwd;
+		cred.length = strlen(passwd);
+	} else {
+		cred.data = (uint8_t *)"";
+		cred.length = 0;
+	}
+	return tldap_sasl_bind(ld, dn, NULL, &cred, NULL, NULL);
+}
+
+/*****************************************************************************/
+
+/*
+ * This piece has a dependency on ldb, the ldb_parse_tree() function is used.
+ * In case we want to separate out tldap, we need to copy or rewrite it.
+ */
+
+#include "lib/ldb/include/ldb.h"
+#include "lib/ldb/include/ldb_errors.h"
+
+static bool ldap_push_filter(struct asn1_data *data,
+			     struct ldb_parse_tree *tree)
+{
+	int i;
+
+	switch (tree->operation) {
+	case LDB_OP_AND:
+	case LDB_OP_OR:
+		asn1_push_tag(data,
+			      ASN1_CONTEXT(tree->operation==LDB_OP_AND?0:1));
+		for (i=0; i<tree->u.list.num_elements; i++) {
+			if (!ldap_push_filter(data,
+					      tree->u.list.elements[i])) {
+				return false;
+			}
+		}
+		asn1_pop_tag(data);
+		break;
+
+	case LDB_OP_NOT:
+		asn1_push_tag(data, ASN1_CONTEXT(2));
+		if (!ldap_push_filter(data, tree->u.isnot.child)) {
+			return false;
+		}
+		asn1_pop_tag(data);
+		break;
+
+	case LDB_OP_EQUALITY:
+		/* equality test */
+		asn1_push_tag(data, ASN1_CONTEXT(3));
+		asn1_write_OctetString(data, tree->u.equality.attr,
+				      strlen(tree->u.equality.attr));
+		asn1_write_OctetString(data, tree->u.equality.value.data,
+				      tree->u.equality.value.length);
+		asn1_pop_tag(data);
+		break;
+
+	case LDB_OP_SUBSTRING:
+		/*
+		  SubstringFilter ::= SEQUENCE {
+			  type            AttributeDescription,
+			  -- at least one must be present
+			  substrings      SEQUENCE OF CHOICE {
+				  initial [0] LDAPString,
+				  any     [1] LDAPString,
+				  final   [2] LDAPString } }
+		*/
+		asn1_push_tag(data, ASN1_CONTEXT(4));
+		asn1_write_OctetString(data, tree->u.substring.attr,
+				       strlen(tree->u.substring.attr));
+		asn1_push_tag(data, ASN1_SEQUENCE(0));
+		i = 0;
+		if (!tree->u.substring.start_with_wildcard) {
+			asn1_push_tag(data, ASN1_CONTEXT_SIMPLE(0));
+			asn1_write_DATA_BLOB_LDAPString(
+				data, tree->u.substring.chunks[i]);
+			asn1_pop_tag(data);
+			i++;
+		}
+		while (tree->u.substring.chunks[i]) {
+			int ctx;
+
+			if ((!tree->u.substring.chunks[i + 1]) &&
+			    (tree->u.substring.end_with_wildcard == 0)) {
+				ctx = 2;
+			} else {
+				ctx = 1;
+			}
+			asn1_push_tag(data, ASN1_CONTEXT_SIMPLE(ctx));
+			asn1_write_DATA_BLOB_LDAPString(
+				data, tree->u.substring.chunks[i]);
+			asn1_pop_tag(data);
+			i++;
+		}
+		asn1_pop_tag(data);
+		asn1_pop_tag(data);
+		break;
+
+	case LDB_OP_GREATER:
+		/* greaterOrEqual test */
+		asn1_push_tag(data, ASN1_CONTEXT(5));
+		asn1_write_OctetString(data, tree->u.comparison.attr,
+				      strlen(tree->u.comparison.attr));
+		asn1_write_OctetString(data, tree->u.comparison.value.data,
+				      tree->u.comparison.value.length);
+		asn1_pop_tag(data);
+		break;
+
+	case LDB_OP_LESS:
+		/* lessOrEqual test */
+		asn1_push_tag(data, ASN1_CONTEXT(6));
+		asn1_write_OctetString(data, tree->u.comparison.attr,
+				      strlen(tree->u.comparison.attr));
+		asn1_write_OctetString(data, tree->u.comparison.value.data,
+				      tree->u.comparison.value.length);
+		asn1_pop_tag(data);
+		break;
+
+	case LDB_OP_PRESENT:
+		/* present test */
+		asn1_push_tag(data, ASN1_CONTEXT_SIMPLE(7));
+		asn1_write_LDAPString(data, tree->u.present.attr);
+		asn1_pop_tag(data);
+		return !data->has_error;
+
+	case LDB_OP_APPROX:
+		/* approx test */
+		asn1_push_tag(data, ASN1_CONTEXT(8));
+		asn1_write_OctetString(data, tree->u.comparison.attr,
+				      strlen(tree->u.comparison.attr));
+		asn1_write_OctetString(data, tree->u.comparison.value.data,
+				      tree->u.comparison.value.length);
+		asn1_pop_tag(data);
+		break;
+
+	case LDB_OP_EXTENDED:
+		/*
+		  MatchingRuleAssertion ::= SEQUENCE {
+		  matchingRule    [1] MatchingRuleID OPTIONAL,
+		  type            [2] AttributeDescription OPTIONAL,
+		  matchValue      [3] AssertionValue,
+		  dnAttributes    [4] BOOLEAN DEFAULT FALSE
+		  }
+		*/
+		asn1_push_tag(data, ASN1_CONTEXT(9));
+		if (tree->u.extended.rule_id) {
+			asn1_push_tag(data, ASN1_CONTEXT_SIMPLE(1));
+			asn1_write_LDAPString(data, tree->u.extended.rule_id);
+			asn1_pop_tag(data);
+		}
+		if (tree->u.extended.attr) {
+			asn1_push_tag(data, ASN1_CONTEXT_SIMPLE(2));
+			asn1_write_LDAPString(data, tree->u.extended.attr);
+			asn1_pop_tag(data);
+		}
+		asn1_push_tag(data, ASN1_CONTEXT_SIMPLE(3));
+		asn1_write_DATA_BLOB_LDAPString(data, &tree->u.extended.value);
+		asn1_pop_tag(data);
+		asn1_push_tag(data, ASN1_CONTEXT_SIMPLE(4));
+		asn1_write_uint8(data, tree->u.extended.dnAttributes);
+		asn1_pop_tag(data);
+		asn1_pop_tag(data);
+		break;
+
+	default:
+		return false;
+	}
+	return !data->has_error;
+}
+
+static bool tldap_push_filter(struct asn1_data *data, const char *filter)
+{
+	struct ldb_parse_tree *tree;
+	bool ret;
+
+	tree = ldb_parse_tree(talloc_tos(), filter);
+	if (tree == NULL) {
+		return false;
+	}
+	ret = ldap_push_filter(data, tree);
+	TALLOC_FREE(tree);
+	return ret;
+}
+
+/*****************************************************************************/
+
+static void tldap_search_done(struct tevent_req *subreq);
+
+struct tevent_req *tldap_search_send(TALLOC_CTX *mem_ctx,
+				     struct tevent_context *ev,
+				     struct tldap_context *ld,
+				     const char *base, int scope,
+				     const char *filter,
+				     const char **attrs,
+				     int num_attrs,
+				     int attrsonly,
+				     struct tldap_control **sctrls,
+				     struct tldap_control **cctrls,
+				     int timelimit,
+				     int sizelimit,
+				     int deref)
+{
+	struct tevent_req *req, *subreq;
+	struct tldap_req_state *state;
+	int i;
+
+	req = tldap_req_create(mem_ctx, ld, &state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	asn1_push_tag(state->out, TLDAP_REQ_SEARCH);
+	asn1_write_OctetString(state->out, base, strlen(base));
+	asn1_write_enumerated(state->out, scope);
+	asn1_write_enumerated(state->out, deref);
+	asn1_write_Integer(state->out, sizelimit);
+	asn1_write_Integer(state->out, timelimit);
+	asn1_write_BOOLEAN(state->out, attrsonly);
+
+	if (!tldap_push_filter(state->out, filter)) {
+		goto encoding_error;
+	}
+
+	asn1_push_tag(state->out, ASN1_SEQUENCE(0));
+	for (i=0; i<num_attrs; i++) {
+		asn1_write_OctetString(state->out, attrs[i], strlen(attrs[i]));
+	}
+	asn1_pop_tag(state->out);
+	asn1_pop_tag(state->out);
+
+	subreq = tldap_msg_send(state, ev, ld, state->id, state->out);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, tldap_search_done, req);
+	return req;
+
+ encoding_error:
+	tevent_req_error(req, TLDAP_ENCODING_ERROR);
+	return tevent_req_post(req, ev);
+}
+
+static void tldap_search_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct tldap_req_state *state = tevent_req_data(
+		req, struct tldap_req_state);
+	int err;
+
+	err = tldap_msg_recv(subreq, state, &state->result);
+	if (err != TLDAP_SUCCESS) {
+		tevent_req_error(req, err);
+		return;
+	}
+	switch (state->result->type) {
+	case TLDAP_RES_SEARCH_ENTRY:
+	case TLDAP_RES_SEARCH_REFERENCE:
+		tevent_req_notify_callback(req);
+		if (!tldap_msg_set_pending(subreq)) {
+			tevent_req_nomem(NULL, req);
+			return;
+		}
+		break;
+	case TLDAP_RES_SEARCH_RESULT:
+		TALLOC_FREE(subreq);
+		if (!asn1_start_tag(state->result->data,
+				    state->result->type) ||
+		    !tldap_decode_response(state) ||
+		    !asn1_end_tag(state->result->data)) {
+			tevent_req_error(req, TLDAP_DECODING_ERROR);
+			return;
+		}
+		tevent_req_done(req);
+		break;
+	default:
+		tevent_req_error(req, TLDAP_PROTOCOL_ERROR);
+		return;
+	}
+}
+
+int tldap_search_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+		      struct tldap_message **pmsg)
+{
+	struct tldap_req_state *state = tevent_req_data(
+		req, struct tldap_req_state);
+	int err;
+
+	if (!tevent_req_is_in_progress(req)
+	    && tevent_req_is_ldap_error(req, &err)) {
+		return err;
+	}
+
+	if (tevent_req_is_in_progress(req)) {
+		switch (state->result->type) {
+		case TLDAP_RES_SEARCH_ENTRY:
+		case TLDAP_RES_SEARCH_REFERENCE:
+			break;
+		default:
+			return TLDAP_OPERATIONS_ERROR;
+		}
+	}
+
+	*pmsg = state->result;
+	return TLDAP_SUCCESS;
+}
+
+struct tldap_sync_search_state {
+	TALLOC_CTX *mem_ctx;
+	struct tldap_message **entries;
+	struct tldap_message **refs;
+	int rc;
+};
+
+static void tldap_search_cb(struct tevent_req *req)
+{
+	struct tldap_sync_search_state *state =
+		(struct tldap_sync_search_state *)
+		tevent_req_callback_data_void(req);
+	struct tldap_message *msg, **tmp;
+	int rc, num_entries, num_refs;
+
+	rc = tldap_search_recv(req, talloc_tos(), &msg);
+	if (rc != TLDAP_SUCCESS) {
+		state->rc = rc;
+		return;
+	}
+
+	switch (tldap_msg_type(msg)) {
+	case TLDAP_RES_SEARCH_ENTRY:
+		num_entries = talloc_array_length(state->entries);
+		tmp = talloc_realloc(state->mem_ctx, state->entries,
+				     struct tldap_message *, num_entries + 1);
+		if (tmp == NULL) {
+			state->rc = TLDAP_NO_MEMORY;
+			return;
+		}
+		state->entries = tmp;
+		state->entries[num_entries] = talloc_move(state->entries,
+							  &msg);
+		break;
+	case TLDAP_RES_SEARCH_REFERENCE:
+		num_refs = talloc_array_length(state->refs);
+		tmp = talloc_realloc(state->mem_ctx, state->refs,
+				     struct tldap_message *, num_refs + 1);
+		if (tmp == NULL) {
+			state->rc = TLDAP_NO_MEMORY;
+			return;
+		}
+		state->refs = tmp;
+		state->refs[num_refs] = talloc_move(state->refs, &msg);
+		break;
+	case TLDAP_RES_SEARCH_RESULT:
+		state->rc = TLDAP_SUCCESS;
+		break;
+	default:
+		state->rc = TLDAP_PROTOCOL_ERROR;
+		break;
+	}
+}
+
+int tldap_search(struct tldap_context *ld,
+		 const char *base, int scope, const char *filter,
+		 const char **attrs, int num_attrs, int attrsonly,
+		 struct tldap_control **sctrls, struct tldap_control **cctrls,
+		 int timelimit, int sizelimit, int deref,
+		 TALLOC_CTX *mem_ctx, struct tldap_message ***entries,
+		 struct tldap_message ***refs)
+{
+	TALLOC_CTX *frame = talloc_stackframe();
+	struct tevent_context *ev;
+	struct tevent_req *req;
+	struct tldap_sync_search_state state;
+
+	ZERO_STRUCT(state);
+	state.mem_ctx = mem_ctx;
+	state.rc = TLDAP_SUCCESS;
+
+	ev = event_context_init(frame);
+	if (ev == NULL) {
+		state.rc = TLDAP_NO_MEMORY;
+		goto fail;
+	}
+
+	req = tldap_search_send(frame, ev, ld, base, scope, filter,
+				attrs, num_attrs, attrsonly,
+				sctrls, cctrls, timelimit,
+				sizelimit, deref);
+	if (req == NULL) {
+		state.rc = TLDAP_NO_MEMORY;
+		goto fail;
+	}
+
+	tevent_req_set_callback(req, tldap_search_cb, &state);
+
+	while (tevent_req_is_in_progress(req)
+	       && (state.rc == TLDAP_SUCCESS)) {
+		if (tevent_loop_once(ev) == -1) {
+			return TLDAP_OPERATIONS_ERROR;
+		}
+	}
+
+	if (state.rc != TLDAP_SUCCESS) {
+		return state.rc;
+	}
+
+	if (entries != NULL) {
+		*entries = state.entries;
+	} else {
+		TALLOC_FREE(state.entries);
+	}
+	if (refs != NULL) {
+		*refs = state.refs;
+	} else {
+		TALLOC_FREE(state.refs);
+	}
+	tldap_save_errors(ld, req);
+fail:
+	TALLOC_FREE(frame);
+	return state.rc;
+}
+
+static bool tldap_parse_search_entry(struct tldap_message *msg)
+{
+	int num_attribs = 0;
+
+	asn1_start_tag(msg->data, msg->type);
+
+	/* dn */
+
+	asn1_read_OctetString_talloc(msg, msg->data, &msg->dn);
+	if (msg->dn == NULL) {
+		return false;
+	}
+
+	/*
+	 * Attributes: We overallocate msg->attribs by one, so that while
+	 * looping over the attributes we can directly parse into the last
+	 * array element. Same for the values in the inner loop.
+	 */
+
+	msg->attribs = talloc_array(msg, struct tldap_attribute, 1);
+	if (msg->attribs == NULL) {
+		return false;
+	}
+
+	asn1_start_tag(msg->data, ASN1_SEQUENCE(0));
+	while (asn1_peek_tag(msg->data, ASN1_SEQUENCE(0))) {
+		struct tldap_attribute *attrib;
+		int num_values = 0;
+
+		attrib = &msg->attribs[num_attribs];
+		attrib->values = talloc_array(msg->attribs, DATA_BLOB, 1);
+		if (attrib->values == NULL) {
+			return false;
+		}
+		asn1_start_tag(msg->data, ASN1_SEQUENCE(0));
+		asn1_read_OctetString_talloc(msg->attribs, msg->data,
+					     &attrib->name);
+		asn1_start_tag(msg->data, ASN1_SET);
+
+		while (asn1_peek_tag(msg->data, ASN1_OCTET_STRING)) {
+			asn1_read_OctetString(msg->data, msg,
+					      &attrib->values[num_values]);
+
+			attrib->values = talloc_realloc(
+				msg->attribs, attrib->values, DATA_BLOB,
+				num_values + 2);
+			if (attrib->values == NULL) {
+				return false;
+			}
+			num_values += 1;
+		}
+		attrib->values = talloc_realloc(msg->attribs, attrib->values,
+						DATA_BLOB, num_values);
+		attrib->num_values = num_values;
+
+		asn1_end_tag(msg->data); /* ASN1_SET */
+		asn1_end_tag(msg->data); /* ASN1_SEQUENCE(0) */
+		msg->attribs = talloc_realloc(
+			msg, msg->attribs, struct tldap_attribute,
+			num_attribs + 2);
+		if (msg->attribs == NULL) {
+			return false;
+		}
+		num_attribs += 1;
+	}
+	msg->attribs = talloc_realloc(
+		msg, msg->attribs, struct tldap_attribute, num_attribs);
+	asn1_end_tag(msg->data);
+	if (msg->data->has_error) {
+		return false;
+	}
+	return true;
+}
+
+bool tldap_entry_dn(struct tldap_message *msg, char **dn)
+{
+	if ((msg->dn == NULL) && (!tldap_parse_search_entry(msg))) {
+		return false;
+	}
+	*dn = msg->dn;
+	return true;
+}
+
+bool tldap_entry_attributes(struct tldap_message *msg, int *num_attributes,
+			    struct tldap_attribute **attributes)
+{
+	if ((msg->dn == NULL) && (!tldap_parse_search_entry(msg))) {
+		return false;
+	}
+	*attributes = msg->attribs;
+	*num_attributes = talloc_array_length(msg->attribs);
+	return true;
+}
+
+static void tldap_simple_done(struct tevent_req *subreq, int type)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct tldap_req_state *state = tevent_req_data(
+		req, struct tldap_req_state);
+	int err;
+
+	err = tldap_msg_recv(subreq, state, &state->result);
+	TALLOC_FREE(subreq);
+	if (err != TLDAP_SUCCESS) {
+		tevent_req_error(req, err);
+		return;
+	}
+	if (state->result->type != type) {
+		tevent_req_error(req, TLDAP_PROTOCOL_ERROR);
+		return;
+	}
+	if (!asn1_start_tag(state->result->data, state->result->type) ||
+	    !tldap_decode_response(state) ||
+	    !asn1_end_tag(state->result->data)) {
+		tevent_req_error(req, TLDAP_DECODING_ERROR);
+		return;
+	}
+	if (state->lderr != TLDAP_SUCCESS) {
+		tevent_req_error(req, state->lderr);
+		return;
+	}
+	tevent_req_done(req);
+}
+
+static int tldap_simple_recv(struct tevent_req *req)
+{
+	int err;
+	if (tevent_req_is_ldap_error(req, &err)) {
+		return err;
+	}
+	return TLDAP_SUCCESS;
+}
+
+static void tldap_add_done(struct tevent_req *subreq);
+
+struct tevent_req *tldap_add_send(TALLOC_CTX *mem_ctx,
+				  struct tevent_context *ev,
+				  struct tldap_context *ld,
+				  const char *dn,
+				  int num_attributes,
+				  struct tldap_mod *attributes,
+				  struct tldap_control **sctrls,
+				  struct tldap_control **cctrls)
+{
+	struct tevent_req *req, *subreq;
+	struct tldap_req_state *state;
+	int i, j;
+
+	req = tldap_req_create(mem_ctx, ld, &state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	asn1_push_tag(state->out, TLDAP_REQ_ADD);
+	asn1_write_OctetString(state->out, dn, strlen(dn));
+	asn1_push_tag(state->out, ASN1_SEQUENCE(0));
+
+	for (i=0; i<num_attributes; i++) {
+		struct tldap_mod *attrib = &attributes[i];
+		asn1_push_tag(state->out, ASN1_SEQUENCE(0));
+		asn1_write_OctetString(state->out, attrib->attribute,
+				       strlen(attrib->attribute));
+		asn1_push_tag(state->out, ASN1_SET);
+		for (j=0; j<attrib->num_values; j++) {
+			asn1_write_OctetString(state->out,
+					       attrib->values[j].data,
+					       attrib->values[j].length);
+		}
+		asn1_pop_tag(state->out);
+		asn1_pop_tag(state->out);
+	}
+
+	asn1_pop_tag(state->out);
+	asn1_pop_tag(state->out);
+
+	subreq = tldap_msg_send(state, ev, ld, state->id, state->out);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, tldap_add_done, req);
+	return req;
+
+}
+
+static void tldap_add_done(struct tevent_req *subreq)
+{
+	return tldap_simple_done(subreq, TLDAP_RES_ADD);
+}
+
+int tldap_add_recv(struct tevent_req *req)
+{
+	return tldap_simple_recv(req);
+}
+
+int tldap_add(struct tldap_context *ld, const char *dn,
+	      int num_attributes, struct tldap_mod *attributes,
+	      struct tldap_control **sctrls, struct tldap_control **cctrls)
+{
+	TALLOC_CTX *frame = talloc_stackframe();
+	struct tevent_context *ev;
+	struct tevent_req *req;
+	int result;
+
+	ev = event_context_init(frame);
+	if (ev == NULL) {
+		result = TLDAP_NO_MEMORY;
+		goto fail;
+	}
+
+	req = tldap_add_send(frame, ev, ld, dn, num_attributes, attributes,
+			     sctrls, cctrls);
+	if (req == NULL) {
+		result = TLDAP_NO_MEMORY;
+		goto fail;
+	}
+
+	if (!tevent_req_poll(req, ev)) {
+		result = TLDAP_OPERATIONS_ERROR;
+		goto fail;
+	}
+
+	result = tldap_add_recv(req);
+	tldap_save_errors(ld, req);
+ fail:
+	TALLOC_FREE(frame);
+	return result;
+}
+
+static void tldap_modify_done(struct tevent_req *subreq);
+
+struct tevent_req *tldap_modify_send(TALLOC_CTX *mem_ctx,
+				     struct tevent_context *ev,
+				     struct tldap_context *ld,
+				     const char *dn,
+				     int num_mods, struct tldap_mod *mods,
+				     struct tldap_control **sctrls,
+				     struct tldap_control **cctrls)
+{
+	struct tevent_req *req, *subreq;
+	struct tldap_req_state *state;
+	int i, j;
+
+	req = tldap_req_create(mem_ctx, ld, &state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	asn1_push_tag(state->out, TLDAP_REQ_MODIFY);
+	asn1_write_OctetString(state->out, dn, strlen(dn));
+	asn1_push_tag(state->out, ASN1_SEQUENCE(0));
+
+	for (i=0; i<num_mods; i++) {
+		struct tldap_mod *mod = &mods[i];
+		asn1_push_tag(state->out, ASN1_SEQUENCE(0));
+		asn1_write_enumerated(state->out, mod->mod_op),
+		asn1_push_tag(state->out, ASN1_SEQUENCE(0));
+		asn1_write_OctetString(state->out, mod->attribute,
+				       strlen(mod->attribute));
+		asn1_push_tag(state->out, ASN1_SET);
+		for (j=0; j<mod->num_values; j++) {
+			asn1_write_OctetString(state->out,
+					       mod->values[j].data,
+					       mod->values[j].length);
+		}
+		asn1_pop_tag(state->out);
+		asn1_pop_tag(state->out);
+		asn1_pop_tag(state->out);
+	}
+
+	asn1_pop_tag(state->out);
+	asn1_pop_tag(state->out);
+
+	subreq = tldap_msg_send(state, ev, ld, state->id, state->out);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, tldap_modify_done, req);
+	return req;
+
+}
+
+static void tldap_modify_done(struct tevent_req *subreq)
+{
+	return tldap_simple_done(subreq, TLDAP_RES_MODIFY);
+}
+
+int tldap_modify_recv(struct tevent_req *req)
+{
+	return tldap_simple_recv(req);
+}
+
+int tldap_modify(struct tldap_context *ld, const char *dn,
+		 int num_mods, struct tldap_mod *mods,
+		 struct tldap_control **sctrls, struct tldap_control **cctrls)
+ {
+	TALLOC_CTX *frame = talloc_stackframe();
+	struct tevent_context *ev;
+	struct tevent_req *req;
+	int result;
+
+	ev = event_context_init(frame);
+	if (ev == NULL) {
+		result = TLDAP_NO_MEMORY;
+		goto fail;
+	}
+
+	req = tldap_modify_send(frame, ev, ld, dn, num_mods, mods,
+				sctrls, cctrls);
+	if (req == NULL) {
+		result = TLDAP_NO_MEMORY;
+		goto fail;
+	}
+
+	if (!tevent_req_poll(req, ev)) {
+		result = TLDAP_OPERATIONS_ERROR;
+		goto fail;
+	}
+
+	result = tldap_modify_recv(req);
+	tldap_save_errors(ld, req);
+ fail:
+	TALLOC_FREE(frame);
+	return result;
+}
+
+static void tldap_delete_done(struct tevent_req *subreq);
+
+struct tevent_req *tldap_delete_send(TALLOC_CTX *mem_ctx,
+				     struct tevent_context *ev,
+				     struct tldap_context *ld,
+				     const char *dn,
+				     struct tldap_control **sctrls,
+				     struct tldap_control **cctrls)
+{
+	struct tevent_req *req, *subreq;
+	struct tldap_req_state *state;
+
+	req = tldap_req_create(mem_ctx, ld, &state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	asn1_push_tag(state->out, TLDAP_REQ_DELETE);
+	asn1_write_OctetString(state->out, dn, strlen(dn));
+	asn1_pop_tag(state->out);
+
+	subreq = tldap_msg_send(state, ev, ld, state->id, state->out);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, tldap_delete_done, req);
+	return req;
+
+}
+
+static void tldap_delete_done(struct tevent_req *subreq)
+{
+	return tldap_simple_done(subreq, TLDAP_RES_DELETE);
+}
+
+int tldap_delete_recv(struct tevent_req *req)
+{
+	return tldap_simple_recv(req);
+}
+
+int tldap_delete(struct tldap_context *ld, const char *dn,
+		 struct tldap_control **sctrls, struct tldap_control **cctrls)
+{
+	TALLOC_CTX *frame = talloc_stackframe();
+	struct tevent_context *ev;
+	struct tevent_req *req;
+	int result;
+
+	ev = event_context_init(frame);
+	if (ev == NULL) {
+		result = TLDAP_NO_MEMORY;
+		goto fail;
+	}
+
+	req = tldap_delete_send(frame, ev, ld, dn, sctrls, cctrls);
+	if (req == NULL) {
+		result = TLDAP_NO_MEMORY;
+		goto fail;
+	}
+
+	if (!tevent_req_poll(req, ev)) {
+		result = TLDAP_OPERATIONS_ERROR;
+		goto fail;
+	}
+
+	result = tldap_delete_recv(req);
+	tldap_save_errors(ld, req);
+ fail:
+	TALLOC_FREE(frame);
+	return result;
+}
+
+int tldap_msg_id(const struct tldap_message *msg)
+{
+	return msg->id;
+}
+
+int tldap_msg_type(const struct tldap_message *msg)
+{
+	return msg->type;
+}
+
+const char *tldap_req_matcheddn(struct tevent_req *req)
+{
+	struct tldap_req_state *state = tevent_req_data(
+		req, struct tldap_req_state);
+	return state->res_matcheddn;
+}
+
+const char *tldap_req_diagnosticmessage(struct tevent_req *req)
+{
+	struct tldap_req_state *state = tevent_req_data(
+		req, struct tldap_req_state);
+	return state->res_diagnosticmessage;
+}
+
+const char *tldap_req_referral(struct tevent_req *req)
+{
+	struct tldap_req_state *state = tevent_req_data(
+		req, struct tldap_req_state);
+	return state->res_referral;
+}
+
+const char *tldap_ctx_matcheddn(struct tldap_context *ctx)
+{
+	return ctx->res_matcheddn;
+}
+
+const char *tldap_ctx_diagnosticmessage(struct tldap_context *ctx)
+{
+	return ctx->res_diagnosticmessage;
+}
+
+const char *tldap_ctx_referral(struct tldap_context *ctx)
+{
+	return ctx->res_referral;
+}
+
+const char *tldap_err2string(int rc)
+{
+	const char *res = NULL;
+
+	/*
+	 * This would normally be a table, but the error codes are not fully
+	 * sequential. Let the compiler figure out the optimum implementation
+	 * :-)
+	 */
+
+	switch (rc) {
+	case TLDAP_SUCCESS:
+		res = "TLDAP_SUCCESS";
+		break;
+	case TLDAP_OPERATIONS_ERROR:
+		res = "TLDAP_OPERATIONS_ERROR";
+		break;
+	case TLDAP_PROTOCOL_ERROR:
+		res = "TLDAP_PROTOCOL_ERROR";
+		break;
+	case TLDAP_TIMELIMIT_EXCEEDED:
+		res = "TLDAP_TIMELIMIT_EXCEEDED";
+		break;
+	case TLDAP_SIZELIMIT_EXCEEDED:
+		res = "TLDAP_SIZELIMIT_EXCEEDED";
+		break;
+	case TLDAP_COMPARE_FALSE:
+		res = "TLDAP_COMPARE_FALSE";
+		break;
+	case TLDAP_COMPARE_TRUE:
+		res = "TLDAP_COMPARE_TRUE";
+		break;
+	case TLDAP_STRONG_AUTH_NOT_SUPPORTED:
+		res = "TLDAP_STRONG_AUTH_NOT_SUPPORTED";
+		break;
+	case TLDAP_STRONG_AUTH_REQUIRED:
+		res = "TLDAP_STRONG_AUTH_REQUIRED";
+		break;
+	case TLDAP_REFERRAL:
+		res = "TLDAP_REFERRAL";
+		break;
+	case TLDAP_ADMINLIMIT_EXCEEDED:
+		res = "TLDAP_ADMINLIMIT_EXCEEDED";
+		break;
+	case TLDAP_UNAVAILABLE_CRITICAL_EXTENSION:
+		res = "TLDAP_UNAVAILABLE_CRITICAL_EXTENSION";
+		break;
+	case TLDAP_CONFIDENTIALITY_REQUIRED:
+		res = "TLDAP_CONFIDENTIALITY_REQUIRED";
+		break;
+	case TLDAP_SASL_BIND_IN_PROGRESS:
+		res = "TLDAP_SASL_BIND_IN_PROGRESS";
+		break;
+	case TLDAP_NO_SUCH_ATTRIBUTE:
+		res = "TLDAP_NO_SUCH_ATTRIBUTE";
+		break;
+	case TLDAP_UNDEFINED_TYPE:
+		res = "TLDAP_UNDEFINED_TYPE";
+		break;
+	case TLDAP_INAPPROPRIATE_MATCHING:
+		res = "TLDAP_INAPPROPRIATE_MATCHING";
+		break;
+	case TLDAP_CONSTRAINT_VIOLATION:
+		res = "TLDAP_CONSTRAINT_VIOLATION";
+		break;
+	case TLDAP_TYPE_OR_VALUE_EXISTS:
+		res = "TLDAP_TYPE_OR_VALUE_EXISTS";
+		break;
+	case TLDAP_INVALID_SYNTAX:
+		res = "TLDAP_INVALID_SYNTAX";
+		break;
+	case TLDAP_NO_SUCH_OBJECT:
+		res = "TLDAP_NO_SUCH_OBJECT";
+		break;
+	case TLDAP_ALIAS_PROBLEM:
+		res = "TLDAP_ALIAS_PROBLEM";
+		break;
+	case TLDAP_INVALID_DN_SYNTAX:
+		res = "TLDAP_INVALID_DN_SYNTAX";
+		break;
+	case TLDAP_IS_LEAF:
+		res = "TLDAP_IS_LEAF";
+		break;
+	case TLDAP_ALIAS_DEREF_PROBLEM:
+		res = "TLDAP_ALIAS_DEREF_PROBLEM";
+		break;
+	case TLDAP_INAPPROPRIATE_AUTH:
+		res = "TLDAP_INAPPROPRIATE_AUTH";
+		break;
+	case TLDAP_INVALID_CREDENTIALS:
+		res = "TLDAP_INVALID_CREDENTIALS";
+		break;
+	case TLDAP_INSUFFICIENT_ACCESS:
+		res = "TLDAP_INSUFFICIENT_ACCESS";
+		break;
+	case TLDAP_BUSY:
+		res = "TLDAP_BUSY";
+		break;
+	case TLDAP_UNAVAILABLE:
+		res = "TLDAP_UNAVAILABLE";
+		break;
+	case TLDAP_UNWILLING_TO_PERFORM:
+		res = "TLDAP_UNWILLING_TO_PERFORM";
+		break;
+	case TLDAP_LOOP_DETECT:
+		res = "TLDAP_LOOP_DETECT";
+		break;
+	case TLDAP_NAMING_VIOLATION:
+		res = "TLDAP_NAMING_VIOLATION";
+		break;
+	case TLDAP_OBJECT_CLASS_VIOLATION:
+		res = "TLDAP_OBJECT_CLASS_VIOLATION";
+		break;
+	case TLDAP_NOT_ALLOWED_ON_NONLEAF:
+		res = "TLDAP_NOT_ALLOWED_ON_NONLEAF";
+		break;
+	case TLDAP_NOT_ALLOWED_ON_RDN:
+		res = "TLDAP_NOT_ALLOWED_ON_RDN";
+		break;
+	case TLDAP_ALREADY_EXISTS:
+		res = "TLDAP_ALREADY_EXISTS";
+		break;
+	case TLDAP_NO_OBJECT_CLASS_MODS:
+		res = "TLDAP_NO_OBJECT_CLASS_MODS";
+		break;
+	case TLDAP_RESULTS_TOO_LARGE:
+		res = "TLDAP_RESULTS_TOO_LARGE";
+		break;
+	case TLDAP_AFFECTS_MULTIPLE_DSAS:
+		res = "TLDAP_AFFECTS_MULTIPLE_DSAS";
+		break;
+	case TLDAP_OTHER:
+		res = "TLDAP_OTHER";
+		break;
+	case TLDAP_SERVER_DOWN:
+		res = "TLDAP_SERVER_DOWN";
+		break;
+	case TLDAP_LOCAL_ERROR:
+		res = "TLDAP_LOCAL_ERROR";
+		break;
+	case TLDAP_ENCODING_ERROR:
+		res = "TLDAP_ENCODING_ERROR";
+		break;
+	case TLDAP_DECODING_ERROR:
+		res = "TLDAP_DECODING_ERROR";
+		break;
+	case TLDAP_TIMEOUT:
+		res = "TLDAP_TIMEOUT";
+		break;
+	case TLDAP_AUTH_UNKNOWN:
+		res = "TLDAP_AUTH_UNKNOWN";
+		break;
+	case TLDAP_FILTER_ERROR:
+		res = "TLDAP_FILTER_ERROR";
+		break;
+	case TLDAP_USER_CANCELLED:
+		res = "TLDAP_USER_CANCELLED";
+		break;
+	case TLDAP_PARAM_ERROR:
+		res = "TLDAP_PARAM_ERROR";
+		break;
+	case TLDAP_NO_MEMORY:
+		res = "TLDAP_NO_MEMORY";
+		break;
+	case TLDAP_CONNECT_ERROR:
+		res = "TLDAP_CONNECT_ERROR";
+		break;
+	case TLDAP_NOT_SUPPORTED:
+		res = "TLDAP_NOT_SUPPORTED";
+		break;
+	case TLDAP_CONTROL_NOT_FOUND:
+		res = "TLDAP_CONTROL_NOT_FOUND";
+		break;
+	case TLDAP_NO_RESULTS_RETURNED:
+		res = "TLDAP_NO_RESULTS_RETURNED";
+		break;
+	case TLDAP_MORE_RESULTS_TO_RETURN:
+		res = "TLDAP_MORE_RESULTS_TO_RETURN";
+		break;
+	case TLDAP_CLIENT_LOOP:
+		res = "TLDAP_CLIENT_LOOP";
+		break;
+	case TLDAP_REFERRAL_LIMIT_EXCEEDED:
+		res = "TLDAP_REFERRAL_LIMIT_EXCEEDED";
+		break;
+	default:
+		res = talloc_asprintf(talloc_tos(), "Unknown LDAP Error (%d)",
+				      rc);
+		break;
+	}
+	if (res == NULL) {
+		res = "Unknown LDAP Error";
+	}
+	return res;
+}