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

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

1 files changed, 2063 insertions, 0 deletions

diff --git a/source3/winbindd/winbindd_dual.c b/source3/winbindd/winbindd_dual.c
new file mode 100644
index 0000000..3ab3e63
--- /dev/null
+++ b/source3/winbindd/winbindd_dual.c
@@ -0,0 +1,2063 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   Winbind child daemons
+
+   Copyright (C) Andrew Tridgell 2002
+   Copyright (C) Volker Lendecke 2004,2005
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/*
+ * We fork a child per domain to be able to act non-blocking in the main
+ * winbind daemon. A domain controller thousands of miles away being being
+ * slow replying with a 10.000 user list should not hold up netlogon calls
+ * that can be handled locally.
+ */
+
+#include "includes.h"
+#include "winbindd.h"
+#include "rpc_client/rpc_client.h"
+#include "nsswitch/wb_reqtrans.h"
+#include "secrets.h"
+#include "../lib/util/select.h"
+#include "winbindd_traceid.h"
+#include "../libcli/security/security.h"
+#include "system/select.h"
+#include "messages.h"
+#include "../lib/util/tevent_unix.h"
+#include "lib/param/loadparm.h"
+#include "lib/util/sys_rw.h"
+#include "lib/util/sys_rw_data.h"
+#include "passdb.h"
+#include "lib/util/string_wrappers.h"
+#include "lib/global_contexts.h"
+#include "idmap.h"
+#include "libcli/auth/netlogon_creds_cli.h"
+#include "../lib/util/pidfile.h"
+#include "librpc/gen_ndr/ndr_winbind_c.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_WINBIND
+
+static void forall_domain_children(bool (*fn)(struct winbindd_child *c,
+					      void *private_data),
+				   void *private_data)
+{
+	struct winbindd_domain *d;
+
+	for (d = domain_list(); d != NULL; d = d->next) {
+		int i;
+
+		for (i = 0; i < lp_winbind_max_domain_connections(); i++) {
+			struct winbindd_child *c = &d->children[i];
+			bool ok;
+
+			if (c->pid == 0) {
+				continue;
+			}
+
+			ok = fn(c, private_data);
+			if (!ok) {
+				return;
+			}
+		}
+	}
+}
+
+static void forall_children(bool (*fn)(struct winbindd_child *c,
+				       void *private_data),
+			    void *private_data)
+{
+	struct winbindd_child *c;
+	bool ok;
+
+	c = idmap_child();
+	if (c->pid != 0) {
+		ok = fn(c, private_data);
+		if (!ok) {
+			return;
+		}
+	}
+
+	c = locator_child();
+	if (c->pid != 0) {
+		ok = fn(c, private_data);
+		if (!ok) {
+			return;
+		}
+	}
+
+	forall_domain_children(fn, private_data);
+}
+
+/* Read some data from a client connection */
+
+static NTSTATUS child_read_request(int sock, struct winbindd_request *wreq)
+{
+	NTSTATUS status;
+
+	status = read_data_ntstatus(sock, (char *)wreq, sizeof(*wreq));
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(3, ("child_read_request: read_data failed: %s\n",
+			  nt_errstr(status)));
+		return status;
+	}
+
+	if (wreq->extra_len == 0) {
+		wreq->extra_data.data = NULL;
+		return NT_STATUS_OK;
+	}
+
+	DEBUG(10, ("Need to read %d extra bytes\n", (int)wreq->extra_len));
+
+	wreq->extra_data.data = SMB_MALLOC_ARRAY(char, wreq->extra_len + 1);
+	if (wreq->extra_data.data == NULL) {
+		DEBUG(0, ("malloc failed\n"));
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	/* Ensure null termination */
+	wreq->extra_data.data[wreq->extra_len] = '\0';
+
+	status = read_data_ntstatus(sock, wreq->extra_data.data,
+				    wreq->extra_len);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(0, ("Could not read extra data: %s\n",
+			  nt_errstr(status)));
+	}
+	return status;
+}
+
+static NTSTATUS child_write_response(int sock, struct winbindd_response *wrsp)
+{
+	struct iovec iov[2];
+	int iov_count;
+
+	iov[0].iov_base = (void *)wrsp;
+	iov[0].iov_len = sizeof(struct winbindd_response);
+	iov_count = 1;
+
+	if (wrsp->length > sizeof(struct winbindd_response)) {
+		iov[1].iov_base = (void *)wrsp->extra_data.data;
+		iov[1].iov_len = wrsp->length-iov[0].iov_len;
+		iov_count = 2;
+	}
+
+	DEBUG(10, ("Writing %d bytes to parent\n", (int)wrsp->length));
+
+	if (write_data_iov(sock, iov, iov_count) != wrsp->length) {
+		DEBUG(0, ("Could not write result\n"));
+		return NT_STATUS_INVALID_HANDLE;
+	}
+
+	return NT_STATUS_OK;
+}
+
+/*
+ * Do winbind child async request. This is not simply wb_simple_trans. We have
+ * to do the queueing ourselves because while a request is queued, the child
+ * might have crashed, and we have to re-fork it in the _trigger function.
+ */
+
+struct wb_child_request_state {
+	struct tevent_context *ev;
+	struct tevent_req *queue_subreq;
+	struct tevent_req *subreq;
+	struct winbindd_child *child;
+	struct winbindd_request *request;
+	struct winbindd_response *response;
+};
+
+static bool fork_domain_child(struct winbindd_child *child);
+
+static void wb_child_request_waited(struct tevent_req *subreq);
+static void wb_child_request_done(struct tevent_req *subreq);
+static void wb_child_request_orphaned(struct tevent_req *subreq);
+
+static void wb_child_request_cleanup(struct tevent_req *req,
+				     enum tevent_req_state req_state);
+
+struct tevent_req *wb_child_request_send(TALLOC_CTX *mem_ctx,
+					 struct tevent_context *ev,
+					 struct winbindd_child *child,
+					 struct winbindd_request *request)
+{
+	struct tevent_req *req;
+	struct wb_child_request_state *state;
+	struct tevent_req *subreq;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct wb_child_request_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	state->ev = ev;
+	state->child = child;
+
+	/*
+	 * We have to make a copy of "request", because our caller
+	 * might drop us via talloc_free().
+	 *
+	 * The talloc_move() magic in wb_child_request_cleanup() keeps
+	 * all the requests, but if we are sitting deep within
+	 * writev_send() down to the client, we have given it the
+	 * pointer to "request". As our caller lost interest, it will
+	 * just free "request", while writev_send still references it.
+	 */
+
+	state->request = talloc_memdup(state, request, sizeof(*request));
+	if (tevent_req_nomem(state->request, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	state->request->traceid = debug_traceid_get();
+
+	if (request->extra_data.data != NULL) {
+		state->request->extra_data.data = talloc_memdup(
+			state->request,
+			request->extra_data.data,
+			request->extra_len);
+		if (tevent_req_nomem(state->request->extra_data.data, req)) {
+			return tevent_req_post(req, ev);
+		}
+	}
+
+	subreq = tevent_queue_wait_send(state, ev, child->queue);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, wb_child_request_waited, req);
+	state->queue_subreq = subreq;
+
+	tevent_req_set_cleanup_fn(req, wb_child_request_cleanup);
+
+	return req;
+}
+
+static void wb_child_request_waited(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct wb_child_request_state *state = tevent_req_data(
+		req, struct wb_child_request_state);
+	bool ok;
+
+	ok = tevent_queue_wait_recv(subreq);
+	if (!ok) {
+		tevent_req_oom(req);
+		return;
+	}
+	/*
+	 * We need to keep state->queue_subreq
+	 * in order to block the queue.
+	 */
+	subreq = NULL;
+
+	if ((state->child->sock == -1) && (!fork_domain_child(state->child))) {
+		tevent_req_error(req, errno);
+		return;
+	}
+
+	tevent_fd_set_flags(state->child->monitor_fde, 0);
+
+	subreq = wb_simple_trans_send(state, global_event_context(), NULL,
+				      state->child->sock, state->request);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+
+	state->subreq = subreq;
+	tevent_req_set_callback(subreq, wb_child_request_done, req);
+	tevent_req_set_endtime(req, state->ev, timeval_current_ofs(300, 0));
+}
+
+static void wb_child_request_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct wb_child_request_state *state = tevent_req_data(
+		req, struct wb_child_request_state);
+	int ret, err;
+
+	ret = wb_simple_trans_recv(subreq, state, &state->response, &err);
+	/* Freeing the subrequest is deferred until the cleanup function,
+	 * which has to know whether a subrequest exists, and consequently
+	 * decide whether to shut down the pipe to the child process.
+	 */
+	if (ret == -1) {
+		tevent_req_error(req, err);
+		return;
+	}
+	tevent_req_done(req);
+}
+
+static void wb_child_request_orphaned(struct tevent_req *subreq)
+{
+	struct winbindd_child *child =
+		(struct winbindd_child *)tevent_req_callback_data_void(subreq);
+
+	DBG_WARNING("cleanup orphaned subreq[%p]\n", subreq);
+	TALLOC_FREE(subreq);
+
+	if (child->domain != NULL) {
+		/*
+		 * If the child is attached to a domain,
+		 * we need to make sure the domain queue
+		 * can move forward, after the orphaned
+		 * request is done.
+		 */
+		tevent_queue_start(child->domain->queue);
+	}
+}
+
+int wb_child_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			  struct winbindd_response **presponse, int *err)
+{
+	struct wb_child_request_state *state = tevent_req_data(
+		req, struct wb_child_request_state);
+
+	if (tevent_req_is_unix_error(req, err)) {
+		return -1;
+	}
+	*presponse = talloc_move(mem_ctx, &state->response);
+	return 0;
+}
+
+static void wb_child_request_cleanup(struct tevent_req *req,
+				     enum tevent_req_state req_state)
+{
+	struct wb_child_request_state *state =
+	    tevent_req_data(req, struct wb_child_request_state);
+
+	if (state->subreq == NULL) {
+		/* nothing to cleanup */
+		return;
+	}
+
+	if (req_state == TEVENT_REQ_RECEIVED) {
+		struct tevent_req *subreq = NULL;
+
+		/*
+		 * Our caller gave up, but we need to keep
+		 * the low level request (wb_simple_trans)
+		 * in order to maintain the parent child protocol.
+		 *
+		 * We also need to keep the child queue blocked
+		 * until we got the response from the child.
+		 */
+
+		subreq = talloc_move(state->child->queue, &state->subreq);
+		talloc_move(subreq, &state->queue_subreq);
+		talloc_move(subreq, &state->request);
+		tevent_req_set_callback(subreq,
+					wb_child_request_orphaned,
+					state->child);
+
+		DBG_WARNING("keep orphaned subreq[%p]\n", subreq);
+		return;
+	}
+
+	TALLOC_FREE(state->subreq);
+	TALLOC_FREE(state->queue_subreq);
+
+	tevent_fd_set_flags(state->child->monitor_fde, TEVENT_FD_READ);
+
+	if (state->child->domain != NULL) {
+		/*
+		 * If the child is attached to a domain,
+		 * we need to make sure the domain queue
+		 * can move forward, after the request
+		 * is done.
+		 */
+		tevent_queue_start(state->child->domain->queue);
+	}
+
+	if (req_state == TEVENT_REQ_DONE) {
+		/* transmitted request and got response */
+		return;
+	}
+
+	/*
+	 * Failed to transmit and receive response, or request
+	 * cancelled while being serviced.
+	 * The basic parent/child communication broke, close
+	 * our socket
+	 */
+	TALLOC_FREE(state->child->monitor_fde);
+	close(state->child->sock);
+	state->child->sock = -1;
+}
+
+static void child_socket_readable(struct tevent_context *ev,
+				  struct tevent_fd *fde,
+				  uint16_t flags,
+				  void *private_data)
+{
+	struct winbindd_child *child = private_data;
+
+	if ((flags & TEVENT_FD_READ) == 0) {
+		return;
+	}
+
+	TALLOC_FREE(child->monitor_fde);
+
+	/*
+	 * We're only active when there is no outstanding child
+	 * request. Arriving here means the child closed its socket,
+	 * it died. Do the same here.
+	 */
+
+	SMB_ASSERT(child->sock != -1);
+
+	close(child->sock);
+	child->sock = -1;
+}
+
+static struct winbindd_child *choose_domain_child(struct winbindd_domain *domain)
+{
+	struct winbindd_child *shortest = &domain->children[0];
+	struct winbindd_child *current;
+	int i;
+
+	for (i=0; i<lp_winbind_max_domain_connections(); i++) {
+		size_t shortest_len, current_len;
+
+		current = &domain->children[i];
+		current_len = tevent_queue_length(current->queue);
+
+		if (current_len == 0) {
+			/* idle child */
+			return current;
+		}
+
+		shortest_len = tevent_queue_length(shortest->queue);
+
+		if (current_len < shortest_len) {
+			shortest = current;
+		}
+	}
+
+	return shortest;
+}
+
+struct dcerpc_binding_handle *dom_child_handle(struct winbindd_domain *domain)
+{
+	return domain->binding_handle;
+}
+
+struct wb_domain_request_state {
+	struct tevent_context *ev;
+	struct tevent_queue_entry *queue_entry;
+	struct winbindd_domain *domain;
+	struct winbindd_child *child;
+	struct winbindd_request *request;
+	struct winbindd_request *init_req;
+	struct winbindd_response *response;
+	struct tevent_req *pending_subreq;
+	struct wbint_InitConnection r;
+};
+
+static void wb_domain_request_cleanup(struct tevent_req *req,
+				      enum tevent_req_state req_state)
+{
+	struct wb_domain_request_state *state = tevent_req_data(
+		req, struct wb_domain_request_state);
+
+	/*
+	 * If we're completely done or got a failure.
+	 * we should remove ourself from the domain queue,
+	 * after removing the child subreq from the child queue
+	 * and give the next one in the queue the chance
+	 * to check for an idle child.
+	 */
+	TALLOC_FREE(state->pending_subreq);
+	TALLOC_FREE(state->queue_entry);
+	tevent_queue_start(state->domain->queue);
+}
+
+static void wb_domain_request_trigger(struct tevent_req *req,
+				      void *private_data);
+static void wb_domain_request_gotdc(struct tevent_req *subreq);
+static void wb_domain_request_initialized(struct tevent_req *subreq);
+static void wb_domain_request_done(struct tevent_req *subreq);
+
+struct tevent_req *wb_domain_request_send(TALLOC_CTX *mem_ctx,
+					  struct tevent_context *ev,
+					  struct winbindd_domain *domain,
+					  struct winbindd_request *request)
+{
+	struct tevent_req *req;
+	struct wb_domain_request_state *state;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct wb_domain_request_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	state->domain = domain;
+	state->ev = ev;
+	state->request = request;
+
+	tevent_req_set_cleanup_fn(req, wb_domain_request_cleanup);
+
+	state->queue_entry = tevent_queue_add_entry(
+			domain->queue, state->ev, req,
+			wb_domain_request_trigger, NULL);
+	if (tevent_req_nomem(state->queue_entry, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	return req;
+}
+
+static void wb_domain_request_trigger(struct tevent_req *req,
+				      void *private_data)
+{
+	struct wb_domain_request_state *state = tevent_req_data(
+		req, struct wb_domain_request_state);
+	struct winbindd_domain *domain = state->domain;
+	struct tevent_req *subreq = NULL;
+	size_t shortest_queue_length;
+
+	state->child = choose_domain_child(domain);
+	shortest_queue_length = tevent_queue_length(state->child->queue);
+	if (shortest_queue_length > 0) {
+		/*
+		 * All children are busy, we need to stop
+		 * the queue and untrigger our own queue
+		 * entry. Once a pending request
+		 * is done it calls tevent_queue_start
+		 * and we get retriggered.
+		 */
+		state->child = NULL;
+		tevent_queue_stop(state->domain->queue);
+		tevent_queue_entry_untrigger(state->queue_entry);
+		return;
+	}
+
+	if (domain->initialized) {
+		subreq = wb_child_request_send(state, state->ev, state->child,
+					       state->request);
+		if (tevent_req_nomem(subreq, req)) {
+			return;
+		}
+		tevent_req_set_callback(subreq, wb_domain_request_done, req);
+		state->pending_subreq = subreq;
+
+		/*
+		 * Once the domain is initialized and
+		 * once we placed our real request into the child queue,
+		 * we can remove ourself from the domain queue
+		 * and give the next one in the queue the chance
+		 * to check for an idle child.
+		 */
+		TALLOC_FREE(state->queue_entry);
+		return;
+	}
+
+	state->init_req = talloc_zero(state, struct winbindd_request);
+	if (tevent_req_nomem(state->init_req, req)) {
+		return;
+	}
+
+	if (IS_DC || domain->primary || domain->internal) {
+		/* The primary domain has to find the DC name itself */
+		state->r.in.dcname = talloc_strdup(state, "");
+		if (tevent_req_nomem(state->r.in.dcname, req)) {
+			return;
+		}
+
+		subreq = dcerpc_wbint_InitConnection_r_send(state,
+						state->ev,
+						state->child->binding_handle,
+						&state->r);
+		if (tevent_req_nomem(subreq, req)) {
+			return;
+		}
+		tevent_req_set_callback(subreq, wb_domain_request_initialized,
+					req);
+		state->pending_subreq = subreq;
+		return;
+	}
+
+	/*
+	 * This is *not* the primary domain,
+	 * let's ask our DC about a DC name.
+	 *
+	 * We prefer getting a dns name in dc_unc,
+	 * which is indicated by DS_RETURN_DNS_NAME.
+	 * For NT4 domains we still get the netbios name.
+	 */
+	subreq = wb_dsgetdcname_send(state, state->ev,
+				     state->domain->name,
+				     NULL, /* domain_guid */
+				     NULL, /* site_name */
+				     DS_RETURN_DNS_NAME); /* flags */
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, wb_domain_request_gotdc, req);
+	state->pending_subreq = subreq;
+	return;
+}
+
+static void wb_domain_request_gotdc(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct wb_domain_request_state *state = tevent_req_data(
+		req, struct wb_domain_request_state);
+	struct netr_DsRGetDCNameInfo *dcinfo = NULL;
+	NTSTATUS status;
+	const char *dcname = NULL;
+
+	state->pending_subreq = NULL;
+
+	status = wb_dsgetdcname_recv(subreq, state, &dcinfo);
+	TALLOC_FREE(subreq);
+	if (tevent_req_nterror(req, status)) {
+		return;
+	}
+	dcname = dcinfo->dc_unc;
+	while (dcname != NULL && *dcname == '\\') {
+		dcname++;
+	}
+
+	state->r.in.dcname = talloc_strdup(state, dcname);
+	if (tevent_req_nomem(state->r.in.dcname, req)) {
+		return;
+	}
+
+	TALLOC_FREE(dcinfo);
+
+	subreq = dcerpc_wbint_InitConnection_r_send(state,
+						state->ev,
+						state->child->binding_handle,
+						&state->r);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, wb_domain_request_initialized, req);
+	state->pending_subreq = subreq;
+}
+
+static void wb_domain_request_initialized(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct wb_domain_request_state *state = tevent_req_data(
+		req, struct wb_domain_request_state);
+	NTSTATUS status;
+
+	state->pending_subreq = NULL;
+
+	status = dcerpc_wbint_InitConnection_r_recv(subreq, state);
+	TALLOC_FREE(subreq);
+	if (NT_STATUS_IS_ERR(status)) {
+		tevent_req_error(req, map_errno_from_nt_status(status));
+		return;
+	}
+
+	status = state->r.out.result;
+	if (NT_STATUS_IS_ERR(status)) {
+		tevent_req_error(req, map_errno_from_nt_status(status));
+		return;
+	}
+
+	state->domain->sid = *state->r.out.sid;
+
+	talloc_free(state->domain->name);
+	state->domain->name = talloc_strdup(state->domain, *state->r.out.name);
+	if (state->domain->name == NULL) {
+		tevent_req_error(req, ENOMEM);
+		return;
+	}
+
+	if (*state->r.out.alt_name != NULL &&
+	    strlen(*state->r.out.alt_name) > 0) {
+		talloc_free(state->domain->alt_name);
+
+		state->domain->alt_name = talloc_strdup(state->domain,
+							*state->r.out.alt_name);
+		if (state->domain->alt_name == NULL) {
+			tevent_req_error(req, ENOMEM);
+			return;
+		}
+	}
+
+	state->domain->native_mode =
+			(*state->r.out.flags & WB_DOMINFO_DOMAIN_NATIVE);
+	state->domain->active_directory =
+			(*state->r.out.flags & WB_DOMINFO_DOMAIN_AD);
+	state->domain->initialized = true;
+
+	subreq = wb_child_request_send(state, state->ev, state->child,
+				       state->request);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, wb_domain_request_done, req);
+	state->pending_subreq = subreq;
+
+	/*
+	 * Once the domain is initialized and
+	 * once we placed our real request into the child queue,
+	 * we can remove ourself from the domain queue
+	 * and give the next one in the queue the chance
+	 * to check for an idle child.
+	 */
+	TALLOC_FREE(state->queue_entry);
+}
+
+static void wb_domain_request_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct wb_domain_request_state *state = tevent_req_data(
+		req, struct wb_domain_request_state);
+	int ret, err;
+
+	state->pending_subreq = NULL;
+
+	ret = wb_child_request_recv(subreq, talloc_tos(), &state->response,
+				    &err);
+	TALLOC_FREE(subreq);
+	if (ret == -1) {
+		tevent_req_error(req, err);
+		return;
+	}
+	tevent_req_done(req);
+}
+
+int wb_domain_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			   struct winbindd_response **presponse, int *err)
+{
+	struct wb_domain_request_state *state = tevent_req_data(
+		req, struct wb_domain_request_state);
+
+	if (tevent_req_is_unix_error(req, err)) {
+		return -1;
+	}
+	*presponse = talloc_move(mem_ctx, &state->response);
+	return 0;
+}
+
+static void child_process_request(struct winbindd_child *child,
+				  struct winbindd_cli_state *state)
+{
+	struct winbindd_domain *domain = child->domain;
+
+	/* Free response data - we may be interrupted and receive another
+	   command before being able to send this data off. */
+
+	state->response->result = WINBINDD_ERROR;
+	state->response->length = sizeof(struct winbindd_response);
+
+	/* as all requests in the child are sync, we can use talloc_tos() */
+	state->mem_ctx = talloc_tos();
+
+	/* Process command */
+	state->response->result = winbindd_dual_ndrcmd(domain, state);
+}
+
+void setup_child(struct winbindd_domain *domain, struct winbindd_child *child,
+		 const char *logprefix,
+		 const char *logname)
+{
+	const struct loadparm_substitution *lp_sub =
+		loadparm_s3_global_substitution();
+
+	if (logprefix && logname) {
+		char *logbase = NULL;
+
+		if (*lp_logfile(talloc_tos(), lp_sub)) {
+			char *end = NULL;
+
+			if (asprintf(&logbase, "%s", lp_logfile(talloc_tos(), lp_sub)) < 0) {
+				smb_panic("Internal error: asprintf failed");
+			}
+
+			if ((end = strrchr_m(logbase, '/'))) {
+				*end = '\0';
+			}
+		} else {
+			if (asprintf(&logbase, "%s", get_dyn_LOGFILEBASE()) < 0) {
+				smb_panic("Internal error: asprintf failed");
+			}
+		}
+
+		if (asprintf(&child->logfilename, "%s/%s-%s",
+			     logbase, logprefix, logname) < 0) {
+			SAFE_FREE(logbase);
+			smb_panic("Internal error: asprintf failed");
+		}
+
+		SAFE_FREE(logbase);
+	} else {
+		smb_panic("Internal error: logprefix == NULL && "
+			  "logname == NULL");
+	}
+
+	child->pid = 0;
+	child->sock = -1;
+	child->domain = domain;
+	child->queue = tevent_queue_create(NULL, "winbind_child");
+	SMB_ASSERT(child->queue != NULL);
+
+	child->binding_handle = wbint_binding_handle(NULL, NULL, child);
+	SMB_ASSERT(child->binding_handle != NULL);
+}
+
+struct winbind_child_died_state {
+	pid_t pid;
+	struct winbindd_child *child;
+};
+
+static bool winbind_child_died_fn(struct winbindd_child *child,
+				  void *private_data)
+{
+	struct winbind_child_died_state *state = private_data;
+
+	if (child->pid == state->pid) {
+		state->child = child;
+		return false;
+	}
+	return true;
+}
+
+void winbind_child_died(pid_t pid)
+{
+	struct winbind_child_died_state state = { .pid = pid };
+
+	forall_children(winbind_child_died_fn, &state);
+
+	if (state.child == NULL) {
+		DEBUG(5, ("Already reaped child %u died\n", (unsigned int)pid));
+		return;
+	}
+
+	state.child->pid = 0;
+}
+
+/* Ensure any negative cache entries with the netbios or realm names are removed. */
+
+void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
+{
+	flush_negative_conn_cache_for_domain(domain->name);
+	if (domain->alt_name != NULL) {
+		flush_negative_conn_cache_for_domain(domain->alt_name);
+	}
+}
+
+/*
+ * Parent winbindd process sets its own debug level first and then
+ * sends a message to all the winbindd children to adjust their debug
+ * level to that of parents.
+ */
+
+struct winbind_msg_relay_state {
+	struct messaging_context *msg_ctx;
+	uint32_t msg_type;
+	DATA_BLOB *data;
+};
+
+static bool winbind_msg_relay_fn(struct winbindd_child *child,
+				 void *private_data)
+{
+	struct winbind_msg_relay_state *state = private_data;
+
+	DBG_DEBUG("sending message to pid %u.\n",
+		  (unsigned int)child->pid);
+
+	messaging_send(state->msg_ctx, pid_to_procid(child->pid),
+		       state->msg_type, state->data);
+	return true;
+}
+
+void winbind_msg_debug(struct messaging_context *msg_ctx,
+ 			 void *private_data,
+			 uint32_t msg_type,
+			 struct server_id server_id,
+			 DATA_BLOB *data)
+{
+	struct winbind_msg_relay_state state = {
+		.msg_ctx = msg_ctx, .msg_type = msg_type, .data = data
+	};
+
+	DEBUG(10,("winbind_msg_debug: got debug message.\n"));
+
+	debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
+
+	forall_children(winbind_msg_relay_fn, &state);
+}
+
+void winbind_disconnect_dc_parent(struct messaging_context *msg_ctx,
+				  void *private_data,
+				  uint32_t msg_type,
+				  struct server_id server_id,
+				  DATA_BLOB *data)
+{
+	struct winbind_msg_relay_state state = {
+		.msg_ctx = msg_ctx, .msg_type = msg_type, .data = data
+	};
+
+	DBG_DEBUG("Got disconnect_dc message\n");
+
+	forall_children(winbind_msg_relay_fn, &state);
+}
+
+static void winbindd_msg_reload_services_child(struct messaging_context *msg,
+					       void *private_data,
+					       uint32_t msg_type,
+					       struct server_id server_id,
+					       DATA_BLOB *data)
+{
+	DBG_DEBUG("Got reload-config message\n");
+	winbindd_reload_services_file((const char *)private_data);
+}
+
+/* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
+void winbindd_msg_reload_services_parent(struct messaging_context *msg,
+					 void *private_data,
+					 uint32_t msg_type,
+					 struct server_id server_id,
+					 DATA_BLOB *data)
+{
+	struct winbind_msg_relay_state state = {
+		.msg_ctx = msg,
+		.msg_type = msg_type,
+		.data = data,
+	};
+
+	DBG_DEBUG("Got reload-config message\n");
+
+        /* Flush various caches */
+	winbindd_flush_caches();
+
+	winbindd_reload_services_file((const char *)private_data);
+
+	forall_children(winbind_msg_relay_fn, &state);
+}
+
+/* Set our domains as offline and forward the offline message to our children. */
+
+struct winbind_msg_on_offline_state {
+	struct messaging_context *msg_ctx;
+	uint32_t msg_type;
+};
+
+static bool winbind_msg_on_offline_fn(struct winbindd_child *child,
+				      void *private_data)
+{
+	struct winbind_msg_on_offline_state *state = private_data;
+
+	if (child->domain->internal) {
+		return true;
+	}
+
+	/*
+	 * Each winbindd child should only process requests for one
+	 * domain - make sure we only set it online / offline for that
+	 * domain.
+	 */
+	DBG_DEBUG("sending message to pid %u for domain %s.\n",
+		  (unsigned int)child->pid, child->domain->name);
+
+	messaging_send_buf(state->msg_ctx,
+			   pid_to_procid(child->pid),
+			   state->msg_type,
+			   (const uint8_t *)child->domain->name,
+			   strlen(child->domain->name)+1);
+
+	return true;
+}
+
+void winbind_msg_offline(struct messaging_context *msg_ctx,
+			 void *private_data,
+			 uint32_t msg_type,
+			 struct server_id server_id,
+			 DATA_BLOB *data)
+{
+	struct winbind_msg_on_offline_state state = {
+		.msg_ctx = msg_ctx,
+		.msg_type = MSG_WINBIND_OFFLINE,
+	};
+	struct winbindd_domain *domain;
+
+	DEBUG(10,("winbind_msg_offline: got offline message.\n"));
+
+	if (!lp_winbind_offline_logon()) {
+		DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
+		return;
+	}
+
+	/* Set our global state as offline. */
+	if (!set_global_winbindd_state_offline()) {
+		DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
+		return;
+	}
+
+	/* Set all our domains as offline. */
+	for (domain = domain_list(); domain; domain = domain->next) {
+		if (domain->internal) {
+			continue;
+		}
+		DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
+		domain->online = false;
+	}
+
+	forall_domain_children(winbind_msg_on_offline_fn, &state);
+}
+
+/* Set our domains as online and forward the online message to our children. */
+
+void winbind_msg_online(struct messaging_context *msg_ctx,
+			void *private_data,
+			uint32_t msg_type,
+			struct server_id server_id,
+			DATA_BLOB *data)
+{
+	struct winbind_msg_on_offline_state state = {
+		.msg_ctx = msg_ctx,
+		.msg_type = MSG_WINBIND_ONLINE,
+	};
+
+	DEBUG(10,("winbind_msg_online: got online message.\n"));
+
+	if (!lp_winbind_offline_logon()) {
+		DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
+		return;
+	}
+
+	/* Set our global state as online. */
+	set_global_winbindd_state_online();
+
+	smb_nscd_flush_user_cache();
+	smb_nscd_flush_group_cache();
+
+	/* Tell all our child domains to go online online. */
+	forall_domain_children(winbind_msg_on_offline_fn, &state);
+}
+
+static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
+{
+	struct winbindd_domain *domain;
+	char *buf = NULL;
+
+	if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
+				   get_global_winbindd_state_offline() ?
+				   "Offline":"Online")) == NULL) {
+		return NULL;
+	}
+
+	for (domain = domain_list(); domain; domain = domain->next) {
+		if ((buf = talloc_asprintf_append_buffer(buf, "%s:%s ",
+						  domain->name,
+						  domain->online ?
+						  "Online":"Offline")) == NULL) {
+			return NULL;
+		}
+	}
+
+	buf = talloc_asprintf_append_buffer(buf, "\n");
+
+	DEBUG(5,("collect_onlinestatus: %s", buf));
+
+	return buf;
+}
+
+void winbind_msg_onlinestatus(struct messaging_context *msg_ctx,
+			      void *private_data,
+			      uint32_t msg_type,
+			      struct server_id server_id,
+			      DATA_BLOB *data)
+{
+	TALLOC_CTX *mem_ctx;
+	const char *message;
+
+	DEBUG(5,("winbind_msg_onlinestatus received.\n"));
+
+	mem_ctx = talloc_init("winbind_msg_onlinestatus");
+	if (mem_ctx == NULL) {
+		return;
+	}
+
+	message = collect_onlinestatus(mem_ctx);
+	if (message == NULL) {
+		talloc_destroy(mem_ctx);
+		return;
+	}
+
+	messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_ONLINESTATUS,
+			   (const uint8_t *)message, strlen(message) + 1);
+
+	talloc_destroy(mem_ctx);
+}
+
+void winbind_msg_dump_domain_list(struct messaging_context *msg_ctx,
+				  void *private_data,
+				  uint32_t msg_type,
+				  struct server_id server_id,
+				  DATA_BLOB *data)
+{
+	TALLOC_CTX *mem_ctx;
+	const char *message = NULL;
+	const char *domain = NULL;
+	char *s = NULL;
+	NTSTATUS status;
+	struct winbindd_domain *dom = NULL;
+
+	DEBUG(5,("winbind_msg_dump_domain_list received.\n"));
+
+	mem_ctx = talloc_init("winbind_msg_dump_domain_list");
+	if (!mem_ctx) {
+		return;
+	}
+
+	if (data->length > 0) {
+		domain = (const char *)data->data;
+	}
+
+	if (domain) {
+
+		DEBUG(5,("winbind_msg_dump_domain_list for domain: %s\n",
+			domain));
+
+		message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain,
+						  find_domain_from_name_noinit(domain));
+		if (!message) {
+			talloc_destroy(mem_ctx);
+			return;
+		}
+
+		messaging_send_buf(msg_ctx, server_id,
+				   MSG_WINBIND_DUMP_DOMAIN_LIST,
+				   (const uint8_t *)message, strlen(message) + 1);
+
+		talloc_destroy(mem_ctx);
+
+		return;
+	}
+
+	DEBUG(5,("winbind_msg_dump_domain_list all domains\n"));
+
+	for (dom = domain_list(); dom; dom=dom->next) {
+		message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain, dom);
+		if (!message) {
+			talloc_destroy(mem_ctx);
+			return;
+		}
+
+		s = talloc_asprintf_append(s, "%s\n", message);
+		if (!s) {
+			talloc_destroy(mem_ctx);
+			return;
+		}
+	}
+
+	status = messaging_send_buf(msg_ctx, server_id,
+				    MSG_WINBIND_DUMP_DOMAIN_LIST,
+				    (uint8_t *)s, strlen(s) + 1);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(0,("failed to send message: %s\n",
+		nt_errstr(status)));
+	}
+
+	talloc_destroy(mem_ctx);
+}
+
+static void account_lockout_policy_handler(struct tevent_context *ctx,
+					   struct tevent_timer *te,
+					   struct timeval now,
+					   void *private_data)
+{
+	struct winbindd_child *child =
+		(struct winbindd_child *)private_data;
+	TALLOC_CTX *mem_ctx = NULL;
+	struct samr_DomInfo12 lockout_policy;
+	NTSTATUS result;
+
+	DEBUG(10,("account_lockout_policy_handler called\n"));
+
+	TALLOC_FREE(child->lockout_policy_event);
+
+	if ( !winbindd_can_contact_domain( child->domain ) ) {
+		DEBUG(10,("account_lockout_policy_handler: Removing myself since I "
+			  "do not have an incoming trust to domain %s\n",
+			  child->domain->name));
+
+		return;
+	}
+
+	mem_ctx = talloc_init("account_lockout_policy_handler ctx");
+	if (!mem_ctx) {
+		result = NT_STATUS_NO_MEMORY;
+	} else {
+		result = wb_cache_lockout_policy(child->domain, mem_ctx,
+						 &lockout_policy);
+	}
+	TALLOC_FREE(mem_ctx);
+
+	if (!NT_STATUS_IS_OK(result)) {
+		DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
+			 nt_errstr(result)));
+	}
+
+	child->lockout_policy_event = tevent_add_timer(global_event_context(), NULL,
+						      timeval_current_ofs(3600, 0),
+						      account_lockout_policy_handler,
+						      child);
+}
+
+static time_t get_machine_password_timeout(void)
+{
+	/* until we have gpo support use lp setting */
+	return lp_machine_password_timeout();
+}
+
+static bool calculate_next_machine_pwd_change(const char *domain,
+					      struct timeval *t)
+{
+	time_t pass_last_set_time;
+	time_t timeout;
+	time_t next_change;
+	struct timeval tv;
+	char *pw;
+
+	pw = secrets_fetch_machine_password(domain,
+					    &pass_last_set_time,
+					    NULL);
+
+	if (pw == NULL) {
+		DEBUG(0,("cannot fetch own machine password ????"));
+		return false;
+	}
+
+	SAFE_FREE(pw);
+
+	timeout = get_machine_password_timeout();
+	if (timeout == 0) {
+		DEBUG(10,("machine password never expires\n"));
+		return false;
+	}
+
+	tv.tv_sec = pass_last_set_time;
+	DEBUG(10, ("password last changed %s\n",
+		   timeval_string(talloc_tos(), &tv, false)));
+	tv.tv_sec += timeout;
+	DEBUGADD(10, ("password valid until %s\n",
+		      timeval_string(talloc_tos(), &tv, false)));
+
+	if (time(NULL) < (pass_last_set_time + timeout)) {
+		next_change = pass_last_set_time + timeout;
+		DEBUG(10,("machine password still valid until: %s\n",
+			http_timestring(talloc_tos(), next_change)));
+		*t = timeval_set(next_change, 0);
+
+		if (lp_clustering()) {
+			uint8_t randbuf;
+			/*
+			 * When having a cluster, we have several
+			 * winbinds racing for the password change. In
+			 * the machine_password_change_handler()
+			 * function we check if someone else was
+			 * faster when the event triggers. We add a
+			 * 255-second random delay here, so that we
+			 * don't run to change the password at the
+			 * exact same moment.
+			 */
+			generate_random_buffer(&randbuf, sizeof(randbuf));
+			DEBUG(10, ("adding %d seconds randomness\n",
+				   (int)randbuf));
+			t->tv_sec += randbuf;
+		}
+		return true;
+	}
+
+	DEBUG(10,("machine password expired, needs immediate change\n"));
+
+	*t = timeval_zero();
+
+	return true;
+}
+
+static void machine_password_change_handler(struct tevent_context *ctx,
+					    struct tevent_timer *te,
+					    struct timeval now,
+					    void *private_data)
+{
+	struct messaging_context *msg_ctx = global_messaging_context();
+	struct winbindd_child *child =
+		(struct winbindd_child *)private_data;
+	struct rpc_pipe_client *netlogon_pipe = NULL;
+	struct netlogon_creds_cli_context *netlogon_creds_ctx = NULL;
+	NTSTATUS result;
+	struct timeval next_change;
+
+	DEBUG(10,("machine_password_change_handler called\n"));
+
+	TALLOC_FREE(child->machine_password_change_event);
+
+	if (!calculate_next_machine_pwd_change(child->domain->name,
+					       &next_change)) {
+		DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
+		return;
+	}
+
+	DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
+		   timeval_string(talloc_tos(), &next_change, false)));
+
+	if (!timeval_expired(&next_change)) {
+		DEBUG(10, ("Someone else has already changed the pw\n"));
+		goto done;
+	}
+
+	if (!winbindd_can_contact_domain(child->domain)) {
+		DEBUG(10,("machine_password_change_handler: Removing myself since I "
+			  "do not have an incoming trust to domain %s\n",
+			  child->domain->name));
+		return;
+	}
+
+	result = cm_connect_netlogon_secure(child->domain,
+					    &netlogon_pipe,
+					    &netlogon_creds_ctx);
+	if (!NT_STATUS_IS_OK(result)) {
+		DEBUG(10,("machine_password_change_handler: "
+			"failed to connect netlogon pipe: %s\n",
+			 nt_errstr(result)));
+		return;
+	}
+
+	result = trust_pw_change(netlogon_creds_ctx,
+				 msg_ctx,
+				 netlogon_pipe->binding_handle,
+				 child->domain->name,
+				 child->domain->dcname,
+				 false); /* force */
+
+	DEBUG(10, ("machine_password_change_handler: "
+		   "trust_pw_change returned %s\n",
+		   nt_errstr(result)));
+
+	if (NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) ) {
+		DEBUG(3,("machine_password_change_handler: password set returned "
+			 "ACCESS_DENIED.  Maybe the trust account "
+			 "password was changed and we didn't know it. "
+			 "Killing connections to domain %s\n",
+			 child->domain->name));
+		invalidate_cm_connection(child->domain);
+	}
+
+	if (!calculate_next_machine_pwd_change(child->domain->name,
+					       &next_change)) {
+		DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
+		return;
+	}
+
+	DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
+		   timeval_string(talloc_tos(), &next_change, false)));
+
+	if (!NT_STATUS_IS_OK(result)) {
+		struct timeval tmp;
+		/*
+		 * In case of failure, give the DC a minute to recover
+		 */
+		tmp = timeval_current_ofs(60, 0);
+		next_change = timeval_max(&next_change, &tmp);
+	}
+
+done:
+	child->machine_password_change_event = tevent_add_timer(global_event_context(), NULL,
+							      next_change,
+							      machine_password_change_handler,
+							      child);
+}
+
+/* Deal with a request to go offline. */
+
+static void child_msg_offline(struct messaging_context *msg,
+			      void *private_data,
+			      uint32_t msg_type,
+			      struct server_id server_id,
+			      DATA_BLOB *data)
+{
+	struct winbindd_domain *domain;
+	struct winbindd_domain *primary_domain = NULL;
+	const char *domainname = (const char *)data->data;
+
+	if (data->data == NULL || data->length == 0) {
+		return;
+	}
+
+	DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
+
+	if (!lp_winbind_offline_logon()) {
+		DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
+		return;
+	}
+
+	primary_domain = find_our_domain();
+
+	/* Mark the requested domain offline. */
+
+	for (domain = domain_list(); domain; domain = domain->next) {
+		if (domain->internal) {
+			continue;
+		}
+		if (strequal(domain->name, domainname)) {
+			DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
+			set_domain_offline(domain);
+			/* we are in the trusted domain, set the primary domain
+			 * offline too */
+			if (domain != primary_domain) {
+				set_domain_offline(primary_domain);
+			}
+		}
+	}
+}
+
+/* Deal with a request to go online. */
+
+static void child_msg_online(struct messaging_context *msg,
+			     void *private_data,
+			     uint32_t msg_type,
+			     struct server_id server_id,
+			     DATA_BLOB *data)
+{
+	struct winbindd_domain *domain;
+	struct winbindd_domain *primary_domain = NULL;
+	const char *domainname = (const char *)data->data;
+
+	if (data->data == NULL || data->length == 0) {
+		return;
+	}
+
+	DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
+
+	if (!lp_winbind_offline_logon()) {
+		DEBUG(10,("child_msg_online: rejecting online message.\n"));
+		return;
+	}
+
+	primary_domain = find_our_domain();
+
+	/* Set our global state as online. */
+	set_global_winbindd_state_online();
+
+	/* Try and mark everything online - delete any negative cache entries
+	   to force a reconnect now. */
+
+	for (domain = domain_list(); domain; domain = domain->next) {
+		if (domain->internal) {
+			continue;
+		}
+		if (strequal(domain->name, domainname)) {
+			DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
+			winbindd_flush_negative_conn_cache(domain);
+			set_domain_online_request(domain);
+
+			/* we can be in trusted domain, which will contact primary domain
+			 * we have to bring primary domain online in trusted domain process
+			 * see, winbindd_dual_pam_auth() --> winbindd_dual_pam_auth_samlogon()
+			 * --> contact_domain = find_our_domain()
+			 * */
+			if (domain != primary_domain) {
+				winbindd_flush_negative_conn_cache(primary_domain);
+				set_domain_online_request(primary_domain);
+			}
+		}
+	}
+}
+
+struct winbindd_reinit_after_fork_state {
+	const struct winbindd_child *myself;
+};
+
+static bool winbindd_reinit_after_fork_fn(struct winbindd_child *child,
+					  void *private_data)
+{
+	struct winbindd_reinit_after_fork_state *state = private_data;
+
+	if (child == state->myself) {
+		return true;
+	}
+
+	/* Destroy all possible events in child list. */
+	TALLOC_FREE(child->lockout_policy_event);
+	TALLOC_FREE(child->machine_password_change_event);
+
+	/*
+	 * Children should never be able to send each other messages,
+	 * all messages must go through the parent.
+	 */
+	child->pid = (pid_t)0;
+
+	/*
+	 * Close service sockets to all other children
+	 */
+	if (child->sock != -1) {
+		close(child->sock);
+		child->sock = -1;
+	}
+
+	return true;
+}
+
+NTSTATUS winbindd_reinit_after_fork(const struct winbindd_child *myself,
+				    const char *logfilename)
+{
+	struct winbindd_reinit_after_fork_state state = { .myself = myself };
+	struct winbindd_domain *domain;
+	NTSTATUS status;
+
+	status = reinit_after_fork(
+		global_messaging_context(),
+		global_event_context(),
+		true, NULL);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(0,("reinit_after_fork() failed\n"));
+		return status;
+	}
+	initialize_password_db(true, global_event_context());
+
+	close_conns_after_fork();
+
+	if (logfilename != NULL) {
+		lp_set_logfile(logfilename);
+		reopen_logs();
+	}
+
+	if (!winbindd_setup_sig_term_handler(false)) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	if (!winbindd_setup_sig_hup_handler(logfilename)) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	/* Stop zombies in children */
+	CatchChild();
+
+	/* Don't handle the same messages as our parent. */
+	messaging_deregister(global_messaging_context(),
+			     MSG_SMB_CONF_UPDATED, NULL);
+	messaging_deregister(global_messaging_context(),
+			     MSG_SHUTDOWN, NULL);
+	messaging_deregister(global_messaging_context(),
+			     MSG_WINBIND_OFFLINE, NULL);
+	messaging_deregister(global_messaging_context(),
+			     MSG_WINBIND_ONLINE, NULL);
+	messaging_deregister(global_messaging_context(),
+			     MSG_WINBIND_ONLINESTATUS, NULL);
+	messaging_deregister(global_messaging_context(),
+			     MSG_WINBIND_DUMP_DOMAIN_LIST, NULL);
+	messaging_deregister(global_messaging_context(),
+			     MSG_DEBUG, NULL);
+
+	messaging_deregister(global_messaging_context(),
+			     MSG_WINBIND_DOMAIN_OFFLINE, NULL);
+	messaging_deregister(global_messaging_context(),
+			     MSG_WINBIND_DOMAIN_ONLINE, NULL);
+
+	/* We have destroyed all events in the winbindd_event_context
+	 * in reinit_after_fork(), so clean out all possible pending
+	 * event pointers. */
+
+	/* Deal with check_online_events. */
+
+	for (domain = domain_list(); domain; domain = domain->next) {
+		TALLOC_FREE(domain->check_online_event);
+	}
+
+	/* Ensure we're not handling a credential cache event inherited
+	 * from our parent. */
+
+	ccache_remove_all_after_fork();
+
+	forall_children(winbindd_reinit_after_fork_fn, &state);
+
+	return NT_STATUS_OK;
+}
+
+/*
+ * In a child there will be only one domain, reference that here.
+ */
+static struct winbindd_domain *child_domain;
+
+struct winbindd_domain *wb_child_domain(void)
+{
+	return child_domain;
+}
+
+struct child_handler_state {
+	struct winbindd_child *child;
+	struct winbindd_cli_state cli;
+};
+
+static void child_handler(struct tevent_context *ev, struct tevent_fd *fde,
+			  uint16_t flags, void *private_data)
+{
+	struct child_handler_state *state =
+		(struct child_handler_state *)private_data;
+	NTSTATUS status;
+	uint64_t parent_traceid;
+
+	/* fetch a request from the main daemon */
+	status = child_read_request(state->cli.sock, state->cli.request);
+
+	if (!NT_STATUS_IS_OK(status)) {
+		/* we lost contact with our parent */
+		_exit(0);
+	}
+
+	/* read traceid from request */
+	parent_traceid = state->cli.request->traceid;
+	debug_traceid_set(parent_traceid);
+
+	DEBUG(4,("child daemon request %d\n",
+		 (int)state->cli.request->cmd));
+
+	ZERO_STRUCTP(state->cli.response);
+	state->cli.request->null_term = '\0';
+	state->cli.mem_ctx = talloc_tos();
+	child_process_request(state->child, &state->cli);
+
+	DEBUG(4, ("Finished processing child request %d\n",
+		  (int)state->cli.request->cmd));
+
+	SAFE_FREE(state->cli.request->extra_data.data);
+
+	status = child_write_response(state->cli.sock, state->cli.response);
+	if (!NT_STATUS_IS_OK(status)) {
+		exit(1);
+	}
+}
+
+static bool fork_domain_child(struct winbindd_child *child)
+{
+	int fdpair[2];
+	struct child_handler_state state;
+	struct winbindd_request request;
+	struct winbindd_response response;
+	struct winbindd_domain *primary_domain = NULL;
+	NTSTATUS status;
+	ssize_t nwritten;
+	struct tevent_fd *fde;
+
+	if (child->domain) {
+		DEBUG(10, ("fork_domain_child called for domain '%s'\n",
+			   child->domain->name));
+	} else {
+		DEBUG(10, ("fork_domain_child called without domain.\n"));
+	}
+
+	if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
+		DEBUG(0, ("Could not open child pipe: %s\n",
+			  strerror(errno)));
+		return False;
+	}
+
+	ZERO_STRUCT(state);
+	state.child = child;
+	state.cli.pid = getpid();
+	state.cli.request = &request;
+	state.cli.response = &response;
+
+	child->pid = fork();
+
+	if (child->pid == -1) {
+		DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
+		close(fdpair[0]);
+		close(fdpair[1]);
+		return False;
+	}
+
+	if (child->pid != 0) {
+		/* Parent */
+		ssize_t nread;
+		int rc;
+
+		close(fdpair[0]);
+
+		nread = sys_read(fdpair[1], &status, sizeof(status));
+		if (nread != sizeof(status)) {
+			DEBUG(1, ("fork_domain_child: Could not read child status: "
+				  "nread=%d, error=%s\n", (int)nread,
+				  strerror(errno)));
+			close(fdpair[1]);
+			return false;
+		}
+		if (!NT_STATUS_IS_OK(status)) {
+			DEBUG(1, ("fork_domain_child: Child status is %s\n",
+				  nt_errstr(status)));
+			close(fdpair[1]);
+			return false;
+		}
+
+		child->monitor_fde = tevent_add_fd(global_event_context(),
+						   global_event_context(),
+						   fdpair[1],
+						   TEVENT_FD_READ,
+						   child_socket_readable,
+						   child);
+		if (child->monitor_fde == NULL) {
+			DBG_WARNING("tevent_add_fd failed\n");
+			close(fdpair[1]);
+			return false;
+		}
+
+		rc = set_blocking(fdpair[1], false);
+		if (rc < 0) {
+			close(fdpair[1]);
+			return false;
+		}
+
+		child->sock = fdpair[1];
+
+		return true;
+	}
+
+	/* Child */
+	child_domain = child->domain;
+
+	DEBUG(10, ("Child process %d\n", (int)getpid()));
+
+	state.cli.sock = fdpair[0];
+	close(fdpair[1]);
+
+	status = winbindd_reinit_after_fork(child, child->logfilename);
+
+	/* setup callbacks again, one of them is removed in reinit_after_fork */
+	if (lp_winbind_debug_traceid()) {
+		winbind_debug_traceid_setup(global_event_context());
+	}
+
+	nwritten = sys_write(state.cli.sock, &status, sizeof(status));
+	if (nwritten != sizeof(status)) {
+		DEBUG(1, ("fork_domain_child: Could not write status: "
+			  "nwritten=%d, error=%s\n", (int)nwritten,
+			  strerror(errno)));
+		_exit(0);
+	}
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(1, ("winbindd_reinit_after_fork failed: %s\n",
+			  nt_errstr(status)));
+		_exit(0);
+	}
+
+	if (child_domain != NULL) {
+		setproctitle("domain child [%s]", child_domain->name);
+	} else if (is_idmap_child(child)) {
+		setproctitle("idmap child");
+	}
+
+	/* Handle online/offline messages. */
+	messaging_register(global_messaging_context(), NULL,
+			   MSG_WINBIND_OFFLINE, child_msg_offline);
+	messaging_register(global_messaging_context(), NULL,
+			   MSG_WINBIND_ONLINE, child_msg_online);
+	messaging_register(global_messaging_context(), NULL,
+			   MSG_DEBUG, debug_message);
+	messaging_register(global_messaging_context(), NULL,
+			   MSG_WINBIND_IP_DROPPED,
+			   winbind_msg_ip_dropped);
+	messaging_register(global_messaging_context(), NULL,
+			   MSG_WINBIND_DISCONNECT_DC,
+			   winbind_msg_disconnect_dc);
+	messaging_register(
+		global_messaging_context(),
+		child->logfilename,
+		MSG_SMB_CONF_UPDATED,
+		winbindd_msg_reload_services_child);
+
+	primary_domain = find_our_domain();
+
+	if (primary_domain == NULL) {
+		smb_panic("no primary domain found");
+	}
+
+	/* It doesn't matter if we allow cache login,
+	 * try to bring domain online after fork. */
+	if ( child->domain ) {
+		child->domain->startup = True;
+		child->domain->startup_time = time_mono(NULL);
+		/* we can be in primary domain or in trusted domain
+		 * If we are in trusted domain, set the primary domain
+		 * in start-up mode */
+		if (!(child->domain->internal)) {
+			set_domain_online_request(child->domain);
+			if (!(child->domain->primary)) {
+				primary_domain->startup = True;
+				primary_domain->startup_time = time_mono(NULL);
+				set_domain_online_request(primary_domain);
+			}
+		}
+	}
+
+	/* We might be in the idmap child...*/
+	if (child->domain && !(child->domain->internal) &&
+	    lp_winbind_offline_logon()) {
+
+		set_domain_online_request(child->domain);
+
+		if (primary_domain && (primary_domain != child->domain)) {
+			/* We need to talk to the primary
+			 * domain as well as the trusted
+			 * domain inside a trusted domain
+			 * child.
+			 * See the code in :
+			 * set_dc_type_and_flags_trustinfo()
+			 * for details.
+			 */
+			set_domain_online_request(primary_domain);
+		}
+
+		child->lockout_policy_event = tevent_add_timer(
+			global_event_context(), NULL, timeval_zero(),
+			account_lockout_policy_handler,
+			child);
+	}
+
+	if (child->domain && child->domain->primary &&
+	    !USE_KERBEROS_KEYTAB &&
+	    lp_server_role() == ROLE_DOMAIN_MEMBER) {
+
+		struct timeval next_change;
+
+		if (calculate_next_machine_pwd_change(child->domain->name,
+						       &next_change)) {
+			child->machine_password_change_event = tevent_add_timer(
+				global_event_context(), NULL, next_change,
+				machine_password_change_handler,
+				child);
+		}
+	}
+
+	fde = tevent_add_fd(global_event_context(), NULL, state.cli.sock,
+			    TEVENT_FD_READ, child_handler, &state);
+	if (fde == NULL) {
+		DEBUG(1, ("tevent_add_fd failed\n"));
+		_exit(1);
+	}
+
+	while (1) {
+
+		int ret;
+		TALLOC_CTX *frame = talloc_stackframe();
+
+		ret = tevent_loop_once(global_event_context());
+		if (ret != 0) {
+			DEBUG(1, ("tevent_loop_once failed: %s\n",
+				  strerror(errno)));
+			_exit(1);
+		}
+
+		if (child->domain && child->domain->startup &&
+				(time_mono(NULL) > child->domain->startup_time + 30)) {
+			/* No longer in "startup" mode. */
+			DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
+				child->domain->name ));
+			child->domain->startup = False;
+		}
+
+		TALLOC_FREE(frame);
+	}
+}
+
+void winbind_msg_ip_dropped_parent(struct messaging_context *msg_ctx,
+				   void *private_data,
+				   uint32_t msg_type,
+				   struct server_id server_id,
+				   DATA_BLOB *data)
+{
+	struct winbind_msg_relay_state state = {
+		.msg_ctx = msg_ctx,
+		.msg_type = msg_type,
+		.data = data,
+	};
+
+	winbind_msg_ip_dropped(msg_ctx, private_data, msg_type,
+			       server_id, data);
+
+	forall_children(winbind_msg_relay_fn, &state);
+}
+
+void winbindd_terminate(bool is_parent)
+{
+	if (is_parent) {
+		/* When parent goes away we should
+		 * remove the socket file. Not so
+		 * when children terminate.
+		 */
+		char *path = NULL;
+
+		if (asprintf(&path, "%s/%s",
+			lp_winbindd_socket_directory(), WINBINDD_SOCKET_NAME) > 0) {
+			unlink(path);
+			SAFE_FREE(path);
+		}
+	}
+
+	idmap_close();
+
+	netlogon_creds_cli_close_global_db();
+
+#if 0
+	if (interactive) {
+		TALLOC_CTX *mem_ctx = talloc_init("end_description");
+		char *description = talloc_describe_all(mem_ctx);
+
+		DEBUG(3, ("tallocs left:\n%s\n", description));
+		talloc_destroy(mem_ctx);
+	}
+#endif
+
+	if (is_parent) {
+		pidfile_unlink(lp_pid_directory(), "winbindd");
+	}
+
+	exit(0);
+}
+
+static void winbindd_sig_term_handler(struct tevent_context *ev,
+				      struct tevent_signal *se,
+				      int signum,
+				      int count,
+				      void *siginfo,
+				      void *private_data)
+{
+	bool *p = talloc_get_type_abort(private_data, bool);
+	bool is_parent = *p;
+
+	TALLOC_FREE(p);
+
+	DEBUG(0,("Got sig[%d] terminate (is_parent=%d)\n",
+		 signum, is_parent));
+	winbindd_terminate(is_parent);
+}
+
+bool winbindd_setup_sig_term_handler(bool parent)
+{
+	struct tevent_signal *se;
+	bool *is_parent;
+
+	is_parent = talloc(global_event_context(), bool);
+	if (!is_parent) {
+		return false;
+	}
+
+	*is_parent = parent;
+
+	se = tevent_add_signal(global_event_context(),
+			       is_parent,
+			       SIGTERM, 0,
+			       winbindd_sig_term_handler,
+			       is_parent);
+	if (!se) {
+		DEBUG(0,("failed to setup SIGTERM handler"));
+		talloc_free(is_parent);
+		return false;
+	}
+
+	se = tevent_add_signal(global_event_context(),
+			       is_parent,
+			       SIGINT, 0,
+			       winbindd_sig_term_handler,
+			       is_parent);
+	if (!se) {
+		DEBUG(0,("failed to setup SIGINT handler"));
+		talloc_free(is_parent);
+		return false;
+	}
+
+	se = tevent_add_signal(global_event_context(),
+			       is_parent,
+			       SIGQUIT, 0,
+			       winbindd_sig_term_handler,
+			       is_parent);
+	if (!se) {
+		DEBUG(0,("failed to setup SIGINT handler"));
+		talloc_free(is_parent);
+		return false;
+	}
+
+	return true;
+}
+
+static void flush_caches_noinit(void)
+{
+	/*
+	 * We need to invalidate cached user list entries on a SIGHUP
+         * otherwise cached access denied errors due to restrict anonymous
+         * hang around until the sequence number changes.
+	 * NB
+	 * Skip uninitialized domains when flush cache.
+	 * If domain is not initialized, it means it is never
+	 * used or never become online. look, wcache_invalidate_cache()
+	 * -> get_cache() -> init_dc_connection(). It causes a lot of traffic
+	 * for unused domains and large traffic for primay domain's DC if there
+	 * are many domains..
+	 */
+
+	if (!wcache_invalidate_cache_noinit()) {
+		DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
+		if (!winbindd_cache_validate_and_initialize()) {
+			exit(1);
+		}
+	}
+}
+
+static void winbindd_sig_hup_handler(struct tevent_context *ev,
+				     struct tevent_signal *se,
+				     int signum,
+				     int count,
+				     void *siginfo,
+				     void *private_data)
+{
+	const char *file = (const char *)private_data;
+
+	DEBUG(1,("Reloading services after SIGHUP\n"));
+	flush_caches_noinit();
+	winbindd_reload_services_file(file);
+}
+
+bool winbindd_setup_sig_hup_handler(const char *lfile)
+{
+	struct tevent_signal *se;
+	char *file = NULL;
+
+	if (lfile) {
+		file = talloc_strdup(global_event_context(),
+				     lfile);
+		if (!file) {
+			return false;
+		}
+	}
+
+	se = tevent_add_signal(global_event_context(),
+			       global_event_context(),
+			       SIGHUP, 0,
+			       winbindd_sig_hup_handler,
+			       file);
+	if (!se) {
+		return false;
+	}
+
+	return true;
+}