libwbclient: Add async call framework.

7 files changed, 1229 insertions, 1 deletions

diff --git a/nsswitch/libwbclient/config.mk b/nsswitch/libwbclient/config.mk
new file mode 100644
index 0000000000..ffdab159f8
--- /dev/null
+++ b/nsswitch/libwbclient/config.mk
@@ -0,0 +1,15 @@
+[SUBSYSTEM::LIBWBCLIENT]
+PUBLIC_DEPENDENCIES = LIBASYNC_REQ \
+		      LIBTEVENT \
+		      LIBTALLOC \
+		      UTIL_TEVENT
+
+LIBWBCLIENT_OBJ_FILES = $(addprefix $(libwbclientsrcdir)/, wbc_async.o \
+								wbc_guid.o \
+								wbc_idmap.o \
+								wbclient.o \
+								wbc_pam.o \
+								wbc_pwd.o \
+								wbc_sid.o \
+								wbc_util.o \
+								wb_reqtrans.o )
diff --git a/nsswitch/libwbclient/libwbclient.h b/nsswitch/libwbclient/libwbclient.h
index 74cba7e796..5a25cf462c 100644
--- a/nsswitch/libwbclient/libwbclient.h
+++ b/nsswitch/libwbclient/libwbclient.h
@@ -36,6 +36,7 @@
 /* Public headers */
 
 #include "wbclient.h"
+#include "wbc_async.h"
 
 /* Private headers */
 
diff --git a/nsswitch/libwbclient/wb_reqtrans.c b/nsswitch/libwbclient/wb_reqtrans.c
new file mode 100644
index 0000000000..84ed7198f2
--- /dev/null
+++ b/nsswitch/libwbclient/wb_reqtrans.c
@@ -0,0 +1,445 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   Async transfer of winbindd_request and _response structs
+
+   Copyright (C) Volker Lendecke 2008
+
+     ** NOTE! The following LGPL license applies to the wbclient
+     ** library. This does NOT imply that all of Samba is released
+     ** under the LGPL
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 3 of the License, or (at your option) any later version.
+
+   This library 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "replace.h"
+#include "system/filesys.h"
+#include "system/network.h"
+#include <talloc.h>
+#include <tevent.h>
+struct fd_event;
+struct event_context;
+#include "lib/async_req/async_sock.h"
+#include "lib/util/tevent_unix.h"
+#include "nsswitch/winbind_struct_protocol.h"
+#include "nsswitch/libwbclient/wbclient.h"
+#include "nsswitch/libwbclient/wbc_async.h"
+
+#ifdef DBGC_CLASS
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_WINBIND
+#endif
+
+struct req_read_state {
+	struct winbindd_request *wb_req;
+	size_t max_extra_data;
+	ssize_t ret;
+};
+
+static ssize_t wb_req_more(uint8_t *buf, size_t buflen, void *private_data);
+static void wb_req_read_done(struct tevent_req *subreq);
+
+struct tevent_req *wb_req_read_send(TALLOC_CTX *mem_ctx,
+				    struct tevent_context *ev,
+				    int fd, size_t max_extra_data)
+{
+	struct tevent_req *req, *subreq;
+	struct req_read_state *state;
+
+	req = tevent_req_create(mem_ctx, &state, struct req_read_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->max_extra_data = max_extra_data;
+
+	subreq = read_packet_send(state, ev, fd, 4, wb_req_more, state);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, wb_req_read_done, req);
+	return req;
+}
+
+static ssize_t wb_req_more(uint8_t *buf, size_t buflen, void *private_data)
+{
+	struct req_read_state *state = talloc_get_type_abort(
+		private_data, struct req_read_state);
+	struct winbindd_request *req = (struct winbindd_request *)buf;
+
+	if (buflen == 4) {
+		if (req->length != sizeof(struct winbindd_request)) {
+			DEBUG(0, ("wb_req_read_len: Invalid request size "
+				  "received: %d (expected %d)\n",
+				  (int)req->length,
+				  (int)sizeof(struct winbindd_request)));
+			return -1;
+		}
+		return sizeof(struct winbindd_request) - 4;
+	}
+
+	if ((state->max_extra_data != 0)
+	    && (req->extra_len > state->max_extra_data)) {
+		DEBUG(3, ("Got request with %d bytes extra data on "
+			  "unprivileged socket\n", (int)req->extra_len));
+		return -1;
+	}
+
+	return req->extra_len;
+}
+
+static void wb_req_read_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct req_read_state *state = tevent_req_data(
+		req, struct req_read_state);
+	int err;
+	uint8_t *buf;
+
+	state->ret = read_packet_recv(subreq, state, &buf, &err);
+	TALLOC_FREE(subreq);
+	if (state->ret == -1) {
+		tevent_req_error(req, err);
+		return;
+	}
+
+	state->wb_req = (struct winbindd_request *)buf;
+
+	if (state->wb_req->extra_len != 0) {
+		state->wb_req->extra_data.data =
+			(char *)buf + sizeof(struct winbindd_request);
+	} else {
+		state->wb_req->extra_data.data = NULL;
+	}
+	tevent_req_done(req);
+}
+
+ssize_t wb_req_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			 struct winbindd_request **preq, int *err)
+{
+	struct req_read_state *state = tevent_req_data(
+		req, struct req_read_state);
+
+	if (tevent_req_is_unix_error(req, err)) {
+		return -1;
+	}
+	*preq = talloc_move(mem_ctx, &state->wb_req);
+	return state->ret;
+}
+
+struct req_write_state {
+	struct iovec iov[2];
+	ssize_t ret;
+};
+
+static void wb_req_write_done(struct tevent_req *subreq);
+
+struct tevent_req *wb_req_write_send(TALLOC_CTX *mem_ctx,
+				     struct tevent_context *ev,
+				     struct tevent_queue *queue, int fd,
+				     struct winbindd_request *wb_req)
+{
+	struct tevent_req *req, *subreq;
+	struct req_write_state *state;
+	int count = 1;
+
+	req = tevent_req_create(mem_ctx, &state, struct req_write_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	state->iov[0].iov_base = (void *)wb_req;
+	state->iov[0].iov_len = sizeof(struct winbindd_request);
+
+	if (wb_req->extra_len != 0) {
+		state->iov[1].iov_base = (void *)wb_req->extra_data.data;
+		state->iov[1].iov_len = wb_req->extra_len;
+		count = 2;
+	}
+
+	subreq = writev_send(state, ev, queue, fd, true, state->iov, count);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, wb_req_write_done, req);
+	return req;
+}
+
+static void wb_req_write_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct req_write_state *state = tevent_req_data(
+		req, struct req_write_state);
+	int err;
+
+	state->ret = writev_recv(subreq, &err);
+	TALLOC_FREE(subreq);
+	if (state->ret < 0) {
+		tevent_req_error(req, err);
+		return;
+	}
+	tevent_req_done(req);
+}
+
+ssize_t wb_req_write_recv(struct tevent_req *req, int *err)
+{
+	struct req_write_state *state = tevent_req_data(
+		req, struct req_write_state);
+
+	if (tevent_req_is_unix_error(req, err)) {
+		return -1;
+	}
+	return state->ret;
+}
+
+struct resp_read_state {
+	struct winbindd_response *wb_resp;
+	ssize_t ret;
+};
+
+static ssize_t wb_resp_more(uint8_t *buf, size_t buflen, void *private_data);
+static void wb_resp_read_done(struct tevent_req *subreq);
+
+struct tevent_req *wb_resp_read_send(TALLOC_CTX *mem_ctx,
+				     struct tevent_context *ev, int fd)
+{
+	struct tevent_req *req, *subreq;
+	struct resp_read_state *state;
+
+	req = tevent_req_create(mem_ctx, &state, struct resp_read_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	subreq = read_packet_send(state, ev, fd, 4, wb_resp_more, state);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, wb_resp_read_done, req);
+	return req;
+}
+
+static ssize_t wb_resp_more(uint8_t *buf, size_t buflen, void *private_data)
+{
+	struct winbindd_response *resp = (struct winbindd_response *)buf;
+
+	if (buflen == 4) {
+		if (resp->length < sizeof(struct winbindd_response)) {
+			DEBUG(0, ("wb_resp_read_len: Invalid response size "
+				  "received: %d (expected at least%d)\n",
+				  (int)resp->length,
+				  (int)sizeof(struct winbindd_response)));
+			return -1;
+		}
+	}
+	return resp->length - buflen;
+}
+
+static void wb_resp_read_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct resp_read_state *state = tevent_req_data(
+		req, struct resp_read_state);
+	uint8_t *buf;
+	int err;
+
+	state->ret = read_packet_recv(subreq, state, &buf, &err);
+	TALLOC_FREE(subreq);
+	if (state->ret == -1) {
+		tevent_req_error(req, err);
+		return;
+	}
+
+	state->wb_resp = (struct winbindd_response *)buf;
+
+	if (state->wb_resp->length > sizeof(struct winbindd_response)) {
+		state->wb_resp->extra_data.data =
+			(char *)buf + sizeof(struct winbindd_response);
+	} else {
+		state->wb_resp->extra_data.data = NULL;
+	}
+	tevent_req_done(req);
+}
+
+ssize_t wb_resp_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			  struct winbindd_response **presp, int *err)
+{
+	struct resp_read_state *state = tevent_req_data(
+		req, struct resp_read_state);
+
+	if (tevent_req_is_unix_error(req, err)) {
+		return -1;
+	}
+	*presp = talloc_move(mem_ctx, &state->wb_resp);
+	return state->ret;
+}
+
+struct resp_write_state {
+	struct iovec iov[2];
+	ssize_t ret;
+};
+
+static void wb_resp_write_done(struct tevent_req *subreq);
+
+struct tevent_req *wb_resp_write_send(TALLOC_CTX *mem_ctx,
+				      struct tevent_context *ev,
+				      struct tevent_queue *queue, int fd,
+				      struct winbindd_response *wb_resp)
+{
+	struct tevent_req *req, *subreq;
+	struct resp_write_state *state;
+	int count = 1;
+
+	req = tevent_req_create(mem_ctx, &state, struct resp_write_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	state->iov[0].iov_base = (void *)wb_resp;
+	state->iov[0].iov_len = sizeof(struct winbindd_response);
+
+	if (wb_resp->length > sizeof(struct winbindd_response)) {
+		state->iov[1].iov_base = (void *)wb_resp->extra_data.data;
+		state->iov[1].iov_len =
+			wb_resp->length - sizeof(struct winbindd_response);
+		count = 2;
+	}
+
+	subreq = writev_send(state, ev, queue, fd, true, state->iov, count);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, wb_resp_write_done, req);
+	return req;
+}
+
+static void wb_resp_write_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct resp_write_state *state = tevent_req_data(
+		req, struct resp_write_state);
+	int err;
+
+	state->ret = writev_recv(subreq, &err);
+	TALLOC_FREE(subreq);
+	if (state->ret < 0) {
+		tevent_req_error(req, err);
+		return;
+	}
+	tevent_req_done(req);
+}
+
+ssize_t wb_resp_write_recv(struct tevent_req *req, int *err)
+{
+	struct resp_write_state *state = tevent_req_data(
+		req, struct resp_write_state);
+
+	if (tevent_req_is_unix_error(req, err)) {
+		return -1;
+	}
+	return state->ret;
+}
+
+struct wb_simple_trans_state {
+	struct tevent_context *ev;
+	int fd;
+	struct winbindd_response *wb_resp;
+};
+
+static void wb_simple_trans_write_done(struct tevent_req *subreq);
+static void wb_simple_trans_read_done(struct tevent_req *subreq);
+
+struct tevent_req *wb_simple_trans_send(TALLOC_CTX *mem_ctx,
+					struct tevent_context *ev,
+					struct tevent_queue *queue, int fd,
+					struct winbindd_request *wb_req)
+{
+	struct tevent_req *req, *subreq;
+	struct wb_simple_trans_state *state;
+
+	req = tevent_req_create(mem_ctx, &state, struct wb_simple_trans_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	wb_req->length = sizeof(struct winbindd_request);
+
+	state->ev = ev;
+	state->fd = fd;
+
+	subreq = wb_req_write_send(state, ev, queue, fd, wb_req);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, wb_simple_trans_write_done, req);
+
+	return req;
+}
+
+static void wb_simple_trans_write_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct wb_simple_trans_state *state = tevent_req_data(
+		req, struct wb_simple_trans_state);
+	ssize_t ret;
+	int err;
+
+	ret = wb_req_write_recv(subreq, &err);
+	TALLOC_FREE(subreq);
+	if (ret == -1) {
+		tevent_req_error(req, err);
+		return;
+	}
+	subreq = wb_resp_read_send(state, state->ev, state->fd);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, wb_simple_trans_read_done, req);
+}
+
+static void wb_simple_trans_read_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct wb_simple_trans_state *state = tevent_req_data(
+		req, struct wb_simple_trans_state);
+	ssize_t ret;
+	int err;
+
+	ret = wb_resp_read_recv(subreq, state, &state->wb_resp, &err);
+	TALLOC_FREE(subreq);
+	if (ret == -1) {
+		tevent_req_error(req, err);
+		return;
+	}
+
+	tevent_req_done(req);
+}
+
+int wb_simple_trans_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			 struct winbindd_response **presponse, int *err)
+{
+	struct wb_simple_trans_state *state = tevent_req_data(
+		req, struct wb_simple_trans_state);
+
+	if (tevent_req_is_unix_error(req, err)) {
+		return -1;
+	}
+	*presponse = talloc_move(mem_ctx, &state->wb_resp);
+	return 0;
+}
diff --git a/nsswitch/libwbclient/wbc_async.c b/nsswitch/libwbclient/wbc_async.c
new file mode 100644
index 0000000000..141c9816aa
--- /dev/null
+++ b/nsswitch/libwbclient/wbc_async.c
@@ -0,0 +1,687 @@
+/*
+   Unix SMB/CIFS implementation.
+   Infrastructure for async winbind requests
+   Copyright (C) Volker Lendecke 2008
+
+     ** NOTE! The following LGPL license applies to the wbclient
+     ** library. This does NOT imply that all of Samba is released
+     ** under the LGPL
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 3 of the License, or (at your option) any later version.
+
+   This library 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "replace.h"
+#include "system/filesys.h"
+#include "system/network.h"
+#include <talloc.h>
+#include <tevent.h>
+struct fd_event;
+struct event_context;
+#include "lib/async_req/async_sock.h"
+#include "nsswitch/winbind_struct_protocol.h"
+#include "nsswitch/libwbclient/wbclient.h"
+#include "nsswitch/libwbclient/wbc_async.h"
+
+wbcErr map_wbc_err_from_errno(int error)
+{
+	switch(error) {
+	case EPERM:
+	case EACCES:
+		return WBC_ERR_AUTH_ERROR;
+	case ENOMEM:
+		return WBC_ERR_NO_MEMORY;
+	case EIO:
+	default:
+		return WBC_ERR_UNKNOWN_FAILURE;
+	}
+}
+
+bool tevent_req_is_wbcerr(struct tevent_req *req, wbcErr *pwbc_err)
+{
+	enum tevent_req_state state;
+	uint64_t error;
+	if (!tevent_req_is_error(req, &state, &error)) {
+		*pwbc_err = WBC_ERR_SUCCESS;
+		return false;
+	}
+
+	switch (state) {
+	case TEVENT_REQ_USER_ERROR:
+		*pwbc_err = error;
+		break;
+	case TEVENT_REQ_TIMED_OUT:
+		*pwbc_err = WBC_ERR_UNKNOWN_FAILURE;
+		break;
+	case TEVENT_REQ_NO_MEMORY:
+		*pwbc_err = WBC_ERR_NO_MEMORY;
+		break;
+	default:
+		*pwbc_err = WBC_ERR_UNKNOWN_FAILURE;
+		break;
+	}
+	return true;
+}
+
+wbcErr tevent_req_simple_recv_wbcerr(struct tevent_req *req)
+{
+	wbcErr wbc_err;
+
+	if (tevent_req_is_wbcerr(req, &wbc_err)) {
+		return wbc_err;
+	}
+
+	return WBC_ERR_SUCCESS;
+}
+
+struct wb_context {
+	struct tevent_queue *queue;
+	int fd;
+	bool is_priv;
+};
+
+static int make_nonstd_fd(int fd)
+{
+	int i;
+	int sys_errno = 0;
+	int fds[3];
+	int num_fds = 0;
+
+	if (fd == -1) {
+		return -1;
+	}
+	while (fd < 3) {
+		fds[num_fds++] = fd;
+		fd = dup(fd);
+		if (fd == -1) {
+			sys_errno = errno;
+			break;
+		}
+	}
+	for (i=0; i<num_fds; i++) {
+		close(fds[i]);
+	}
+	if (fd == -1) {
+		errno = sys_errno;
+	}
+	return fd;
+}
+
+/****************************************************************************
+ Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
+ else
+ if SYSV use O_NDELAY
+ if BSD use FNDELAY
+ Set close on exec also.
+****************************************************************************/
+
+static int make_safe_fd(int fd)
+{
+	int result, flags;
+	int new_fd = make_nonstd_fd(fd);
+
+	if (new_fd == -1) {
+		goto fail;
+	}
+
+	/* Socket should be nonblocking. */
+
+#ifdef O_NONBLOCK
+#define FLAG_TO_SET O_NONBLOCK
+#else
+#ifdef SYSV
+#define FLAG_TO_SET O_NDELAY
+#else /* BSD */
+#define FLAG_TO_SET FNDELAY
+#endif
+#endif
+
+	if ((flags = fcntl(new_fd, F_GETFL)) == -1) {
+		goto fail;
+	}
+
+	flags |= FLAG_TO_SET;
+	if (fcntl(new_fd, F_SETFL, flags) == -1) {
+		goto fail;
+	}
+
+#undef FLAG_TO_SET
+
+	/* Socket should be closed on exec() */
+#ifdef FD_CLOEXEC
+	result = flags = fcntl(new_fd, F_GETFD, 0);
+	if (flags >= 0) {
+		flags |= FD_CLOEXEC;
+		result = fcntl( new_fd, F_SETFD, flags );
+	}
+	if (result < 0) {
+		goto fail;
+	}
+#endif
+	return new_fd;
+
+ fail:
+	if (new_fd != -1) {
+		int sys_errno = errno;
+		close(new_fd);
+		errno = sys_errno;
+	}
+	return -1;
+}
+
+struct wb_context *wb_context_init(TALLOC_CTX *mem_ctx)
+{
+	struct wb_context *result;
+
+	result = talloc(mem_ctx, struct wb_context);
+	if (result == NULL) {
+		return NULL;
+	}
+	result->queue = tevent_queue_create(result, "wb_trans");
+	if (result->queue == NULL) {
+		TALLOC_FREE(result);
+		return NULL;
+	}
+	result->fd = -1;
+	result->is_priv = false;
+	return result;
+}
+
+struct wb_connect_state {
+	int dummy;
+};
+
+static void wbc_connect_connected(struct tevent_req *subreq);
+
+static struct tevent_req *wb_connect_send(TALLOC_CTX *mem_ctx,
+					  struct tevent_context *ev,
+					  struct wb_context *wb_ctx,
+					  const char *dir)
+{
+	struct tevent_req *result, *subreq;
+	struct wb_connect_state *state;
+	struct sockaddr_un sunaddr;
+	struct stat st;
+	char *path = NULL;
+	wbcErr wbc_err;
+
+	result = tevent_req_create(mem_ctx, &state, struct wb_connect_state);
+	if (result == NULL) {
+		return NULL;
+	}
+
+	if (wb_ctx->fd != -1) {
+		close(wb_ctx->fd);
+		wb_ctx->fd = -1;
+	}
+
+	/* Check permissions on unix socket directory */
+
+	if (lstat(dir, &st) == -1) {
+		wbc_err = WBC_ERR_WINBIND_NOT_AVAILABLE;
+		goto post_status;
+	}
+
+	if (!S_ISDIR(st.st_mode) ||
+	    (st.st_uid != 0 && st.st_uid != geteuid())) {
+		wbc_err = WBC_ERR_WINBIND_NOT_AVAILABLE;
+		goto post_status;
+	}
+
+	/* Connect to socket */
+
+	path = talloc_asprintf(talloc_tos(), "%s/%s", dir,
+			       WINBINDD_SOCKET_NAME);
+	if (path == NULL) {
+		goto nomem;
+	}
+
+	sunaddr.sun_family = AF_UNIX;
+	strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
+	TALLOC_FREE(path);
+
+	/* If socket file doesn't exist, don't bother trying to connect
+	   with retry.  This is an attempt to make the system usable when
+	   the winbindd daemon is not running. */
+
+	if ((lstat(sunaddr.sun_path, &st) == -1)
+	    || !S_ISSOCK(st.st_mode)
+	    || (st.st_uid != 0 && st.st_uid != geteuid())) {
+		wbc_err = WBC_ERR_WINBIND_NOT_AVAILABLE;
+		goto post_status;
+	}
+
+	wb_ctx->fd = make_safe_fd(socket(AF_UNIX, SOCK_STREAM, 0));
+	if (wb_ctx->fd == -1) {
+		wbc_err = map_wbc_err_from_errno(errno);
+		goto post_status;
+	}
+
+	subreq = async_connect_send(mem_ctx, ev, wb_ctx->fd,
+				    (struct sockaddr *)(void *)&sunaddr,
+				    sizeof(sunaddr));
+	if (subreq == NULL) {
+		goto nomem;
+	}
+	tevent_req_set_callback(subreq, wbc_connect_connected, result);
+	return result;
+
+ post_status:
+	tevent_req_error(result, wbc_err);
+	return tevent_req_post(result, ev);
+ nomem:
+	TALLOC_FREE(result);
+	return NULL;
+}
+
+static void wbc_connect_connected(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	int res, err;
+
+	res = async_connect_recv(subreq, &err);
+	TALLOC_FREE(subreq);
+	if (res == -1) {
+		tevent_req_error(req, map_wbc_err_from_errno(err));
+		return;
+	}
+	tevent_req_done(req);
+}
+
+static wbcErr wb_connect_recv(struct tevent_req *req)
+{
+	return tevent_req_simple_recv_wbcerr(req);
+}
+
+static const char *winbindd_socket_dir(void)
+{
+#ifdef SOCKET_WRAPPER
+	const char *env_dir;
+
+	env_dir = getenv(WINBINDD_SOCKET_DIR_ENVVAR);
+	if (env_dir) {
+		return env_dir;
+	}
+#endif
+
+	return WINBINDD_SOCKET_DIR;
+}
+
+struct wb_open_pipe_state {
+	struct wb_context *wb_ctx;
+	struct tevent_context *ev;
+	bool need_priv;
+	struct winbindd_request wb_req;
+};
+
+static void wb_open_pipe_connect_nonpriv_done(struct tevent_req *subreq);
+static void wb_open_pipe_ping_done(struct tevent_req *subreq);
+static void wb_open_pipe_getpriv_done(struct tevent_req *subreq);
+static void wb_open_pipe_connect_priv_done(struct tevent_req *subreq);
+
+static struct tevent_req *wb_open_pipe_send(TALLOC_CTX *mem_ctx,
+					    struct tevent_context *ev,
+					    struct wb_context *wb_ctx,
+					    bool need_priv)
+{
+	struct tevent_req *result, *subreq;
+	struct wb_open_pipe_state *state;
+
+	result = tevent_req_create(mem_ctx, &state, struct wb_open_pipe_state);
+	if (result == NULL) {
+		return NULL;
+	}
+	state->wb_ctx = wb_ctx;
+	state->ev = ev;
+	state->need_priv = need_priv;
+
+	if (wb_ctx->fd != -1) {
+		close(wb_ctx->fd);
+		wb_ctx->fd = -1;
+	}
+
+	subreq = wb_connect_send(state, ev, wb_ctx, winbindd_socket_dir());
+	if (subreq == NULL) {
+		goto fail;
+	}
+	tevent_req_set_callback(subreq, wb_open_pipe_connect_nonpriv_done,
+				result);
+	return result;
+
+ fail:
+	TALLOC_FREE(result);
+	return NULL;
+}
+
+static void wb_open_pipe_connect_nonpriv_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct wb_open_pipe_state *state = tevent_req_data(
+		req, struct wb_open_pipe_state);
+	wbcErr wbc_err;
+
+	wbc_err = wb_connect_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (!WBC_ERROR_IS_OK(wbc_err)) {
+		state->wb_ctx->is_priv = true;
+		tevent_req_error(req, wbc_err);
+		return;
+	}
+
+	ZERO_STRUCT(state->wb_req);
+	state->wb_req.cmd = WINBINDD_INTERFACE_VERSION;
+	state->wb_req.pid = getpid();
+
+	subreq = wb_simple_trans_send(state, state->ev, NULL,
+				      state->wb_ctx->fd, &state->wb_req);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, wb_open_pipe_ping_done, req);
+}
+
+static void wb_open_pipe_ping_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct wb_open_pipe_state *state = tevent_req_data(
+		req, struct wb_open_pipe_state);
+	struct winbindd_response *wb_resp;
+	int ret, err;
+
+	ret = wb_simple_trans_recv(subreq, state, &wb_resp, &err);
+	TALLOC_FREE(subreq);
+	if (ret == -1) {
+		tevent_req_error(req, map_wbc_err_from_errno(err));
+		return;
+	}
+
+	if (!state->need_priv) {
+		tevent_req_done(req);
+		return;
+	}
+
+	state->wb_req.cmd = WINBINDD_PRIV_PIPE_DIR;
+	state->wb_req.pid = getpid();
+
+	subreq = wb_simple_trans_send(state, state->ev, NULL,
+				      state->wb_ctx->fd, &state->wb_req);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, wb_open_pipe_getpriv_done, req);
+}
+
+static void wb_open_pipe_getpriv_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct wb_open_pipe_state *state = tevent_req_data(
+		req, struct wb_open_pipe_state);
+	struct winbindd_response *wb_resp = NULL;
+	int ret, err;
+
+	ret = wb_simple_trans_recv(subreq, state, &wb_resp, &err);
+	TALLOC_FREE(subreq);
+	if (ret == -1) {
+		tevent_req_error(req, map_wbc_err_from_errno(err));
+		return;
+	}
+
+	close(state->wb_ctx->fd);
+	state->wb_ctx->fd = -1;
+
+	subreq = wb_connect_send(state, state->ev, state->wb_ctx,
+				  (char *)wb_resp->extra_data.data);
+	TALLOC_FREE(wb_resp);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, wb_open_pipe_connect_priv_done, req);
+}
+
+static void wb_open_pipe_connect_priv_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct wb_open_pipe_state *state = tevent_req_data(
+		req, struct wb_open_pipe_state);
+	wbcErr wbc_err;
+
+	wbc_err = wb_connect_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (!WBC_ERROR_IS_OK(wbc_err)) {
+		tevent_req_error(req, wbc_err);
+		return;
+	}
+	state->wb_ctx->is_priv = true;
+	tevent_req_done(req);
+}
+
+static wbcErr wb_open_pipe_recv(struct tevent_req *req)
+{
+	return tevent_req_simple_recv_wbcerr(req);
+}
+
+struct wb_trans_state {
+	struct wb_trans_state *prev, *next;
+	struct wb_context *wb_ctx;
+	struct tevent_context *ev;
+	struct winbindd_request *wb_req;
+	struct winbindd_response *wb_resp;
+	bool need_priv;
+};
+
+static bool closed_fd(int fd)
+{
+	struct timeval tv;
+	fd_set r_fds;
+	int selret;
+
+	if (fd == -1) {
+		return true;
+	}
+
+	FD_ZERO(&r_fds);
+	FD_SET(fd, &r_fds);
+	ZERO_STRUCT(tv);
+
+	selret = select(fd+1, &r_fds, NULL, NULL, &tv);
+	if (selret == -1) {
+		return true;
+	}
+	if (selret == 0) {
+		return false;
+	}
+	return (FD_ISSET(fd, &r_fds));
+}
+
+static void wb_trans_trigger(struct tevent_req *req, void *private_data);
+static void wb_trans_connect_done(struct tevent_req *subreq);
+static void wb_trans_done(struct tevent_req *subreq);
+static void wb_trans_retry_wait_done(struct tevent_req *subreq);
+
+struct tevent_req *wb_trans_send(TALLOC_CTX *mem_ctx,
+				 struct tevent_context *ev,
+				 struct wb_context *wb_ctx, bool need_priv,
+				 struct winbindd_request *wb_req)
+{
+	struct tevent_req *req;
+	struct wb_trans_state *state;
+
+	req = tevent_req_create(mem_ctx, &state, struct wb_trans_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->wb_ctx = wb_ctx;
+	state->ev = ev;
+	state->wb_req = wb_req;
+	state->need_priv = need_priv;
+
+	if (!tevent_queue_add(wb_ctx->queue, ev, req, wb_trans_trigger,
+			      NULL)) {
+		tevent_req_nomem(NULL, req);
+		return tevent_req_post(req, ev);
+	}
+	return req;
+}
+
+static void wb_trans_trigger(struct tevent_req *req, void *private_data)
+{
+	struct wb_trans_state *state = tevent_req_data(
+		req, struct wb_trans_state);
+	struct tevent_req *subreq;
+
+	if ((state->wb_ctx->fd != -1) && closed_fd(state->wb_ctx->fd)) {
+		close(state->wb_ctx->fd);
+		state->wb_ctx->fd = -1;
+	}
+
+	if ((state->wb_ctx->fd == -1)
+	    || (state->need_priv && !state->wb_ctx->is_priv)) {
+		subreq = wb_open_pipe_send(state, state->ev, state->wb_ctx,
+					   state->need_priv);
+		if (tevent_req_nomem(subreq, req)) {
+			return;
+		}
+		tevent_req_set_callback(subreq, wb_trans_connect_done, req);
+		return;
+	}
+
+	state->wb_req->pid = getpid();
+
+	subreq = wb_simple_trans_send(state, state->ev, NULL,
+				      state->wb_ctx->fd, state->wb_req);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, wb_trans_done, req);
+}
+
+static bool wb_trans_retry(struct tevent_req *req,
+			   struct wb_trans_state *state,
+			   wbcErr wbc_err)
+{
+	struct tevent_req *subreq;
+
+	if (WBC_ERROR_IS_OK(wbc_err)) {
+		return false;
+	}
+
+	if (wbc_err == WBC_ERR_WINBIND_NOT_AVAILABLE) {
+		/*
+		 * Winbind not around or we can't connect to the pipe. Fail
+		 * immediately.
+		 */
+		tevent_req_error(req, wbc_err);
+		return true;
+	}
+
+	/*
+	 * The transfer as such failed, retry after one second
+	 */
+
+	if (state->wb_ctx->fd != -1) {
+		close(state->wb_ctx->fd);
+		state->wb_ctx->fd = -1;
+	}
+
+	subreq = tevent_wakeup_send(state, state->ev,
+				    timeval_current_ofs(1, 0));
+	if (tevent_req_nomem(subreq, req)) {
+		return true;
+	}
+	tevent_req_set_callback(subreq, wb_trans_retry_wait_done, req);
+	return true;
+}
+
+static void wb_trans_retry_wait_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct wb_trans_state *state = tevent_req_data(
+		req, struct wb_trans_state);
+	bool ret;
+
+	ret = tevent_wakeup_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (!ret) {
+		tevent_req_error(req, WBC_ERR_UNKNOWN_FAILURE);
+		return;
+	}
+
+	subreq = wb_open_pipe_send(state, state->ev, state->wb_ctx,
+				   state->need_priv);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, wb_trans_connect_done, req);
+}
+
+static void wb_trans_connect_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct wb_trans_state *state = tevent_req_data(
+		req, struct wb_trans_state);
+	wbcErr wbc_err;
+
+	wbc_err = wb_open_pipe_recv(subreq);
+	TALLOC_FREE(subreq);
+
+	if (wb_trans_retry(req, state, wbc_err)) {
+		return;
+	}
+
+	subreq = wb_simple_trans_send(state, state->ev, NULL,
+				      state->wb_ctx->fd, state->wb_req);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, wb_trans_done, req);
+}
+
+static void wb_trans_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct wb_trans_state *state = tevent_req_data(
+		req, struct wb_trans_state);
+	int ret, err;
+
+	ret = wb_simple_trans_recv(subreq, state, &state->wb_resp, &err);
+	TALLOC_FREE(subreq);
+	if ((ret == -1)
+	    && wb_trans_retry(req, state, map_wbc_err_from_errno(err))) {
+		return;
+	}
+
+	tevent_req_done(req);
+}
+
+wbcErr wb_trans_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+		     struct winbindd_response **presponse)
+{
+	struct wb_trans_state *state = tevent_req_data(
+		req, struct wb_trans_state);
+	wbcErr wbc_err;
+
+	if (tevent_req_is_wbcerr(req, &wbc_err)) {
+		return wbc_err;
+	}
+
+	*presponse = talloc_move(mem_ctx, &state->wb_resp);
+	return WBC_ERR_SUCCESS;
+}
diff --git a/nsswitch/libwbclient/wbc_async.h b/nsswitch/libwbclient/wbc_async.h
new file mode 100644
index 0000000000..a2e0eed448
--- /dev/null
+++ b/nsswitch/libwbclient/wbc_async.h
@@ -0,0 +1,79 @@
+/*
+   Unix SMB/CIFS implementation.
+   Headers for the async winbind client library
+   Copyright (C) Volker Lendecke 2008
+
+     ** NOTE! The following LGPL license applies to the wbclient
+     ** library. This does NOT imply that all of Samba is released
+     ** under the LGPL
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 3 of the License, or (at your option) any later version.
+
+   This library 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _WBC_ASYNC_H_
+#define _WBC_ASYNC_H_
+
+#include <talloc.h>
+#include <tevent.h>
+#include "nsswitch/libwbclient/wbclient.h"
+
+struct wb_context;
+struct winbindd_request;
+struct winbindd_response;
+
+struct tevent_req *wb_trans_send(TALLOC_CTX *mem_ctx,
+				 struct tevent_context *ev,
+				 struct wb_context *wb_ctx, bool need_priv,
+				 struct winbindd_request *wb_req);
+wbcErr wb_trans_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+		     struct winbindd_response **presponse);
+struct wb_context *wb_context_init(TALLOC_CTX *mem_ctx);
+
+/* Definitions from wb_reqtrans.c */
+wbcErr map_wbc_err_from_errno(int error);
+
+bool tevent_req_is_wbcerr(struct tevent_req *req, wbcErr *pwbc_err);
+wbcErr tevent_req_simple_recv_wbcerr(struct tevent_req *req);
+
+struct tevent_req *wb_req_read_send(TALLOC_CTX *mem_ctx,
+				    struct tevent_context *ev,
+				    int fd, size_t max_extra_data);
+ssize_t wb_req_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			 struct winbindd_request **preq, int *err);
+
+struct tevent_req *wb_req_write_send(TALLOC_CTX *mem_ctx,
+				     struct tevent_context *ev,
+				     struct tevent_queue *queue, int fd,
+				     struct winbindd_request *wb_req);
+ssize_t wb_req_write_recv(struct tevent_req *req, int *err);
+
+struct tevent_req *wb_resp_read_send(TALLOC_CTX *mem_ctx,
+				     struct tevent_context *ev, int fd);
+ssize_t wb_resp_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			  struct winbindd_response **presp, int *err);
+
+struct tevent_req *wb_resp_write_send(TALLOC_CTX *mem_ctx,
+				      struct tevent_context *ev,
+				      struct tevent_queue *queue, int fd,
+				      struct winbindd_response *wb_resp);
+ssize_t wb_resp_write_recv(struct tevent_req *req, int *err);
+
+struct tevent_req *wb_simple_trans_send(TALLOC_CTX *mem_ctx,
+					struct tevent_context *ev,
+					struct tevent_queue *queue, int fd,
+					struct winbindd_request *wb_req);
+int wb_simple_trans_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			 struct winbindd_response **presponse, int *err);
+
+#endif /*_WBC_ASYNC_H_*/
diff --git a/nsswitch/libwbclient/wbclient.c b/nsswitch/libwbclient/wbclient.c
index f5c72315f2..77b7e12d04 100644
--- a/nsswitch/libwbclient/wbclient.c
+++ b/nsswitch/libwbclient/wbclient.c
@@ -22,6 +22,8 @@
 
 /* Required Headers */
 
+#include "lib/talloc/talloc.h"
+#include "lib/tevent/tevent.h"
 #include "libwbclient.h"
 
 /* From wb_common.c */
diff --git a/nsswitch/libwbclient/wbclient_internal.h b/nsswitch/libwbclient/wbclient_internal.h
index fc03c5409b..2d103ab3df 100644
--- a/nsswitch/libwbclient/wbclient_internal.h
+++ b/nsswitch/libwbclient/wbclient_internal.h
@@ -28,5 +28,4 @@ wbcErr wbcRequestResponse(int cmd,
 			  struct winbindd_request *request,
 			  struct winbindd_response *response);
 
-
 #endif      /* _WBCLIENT_INTERNAL_H */