s3:winbind: Add async wb_seqnums

This is something that would have been very difficult with the old style of
async requests: Send the request to all children simultaneously.

2 files changed, 138 insertions, 0 deletions

diff --git a/source3/winbindd/wb_seqnums.c b/source3/winbindd/wb_seqnums.c
new file mode 100644
index 0000000000..f4044338a1
--- /dev/null
+++ b/source3/winbindd/wb_seqnums.c
@@ -0,0 +1,133 @@
+/*
+   Unix SMB/CIFS implementation.
+   async seqnums
+   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"
+#include "winbindd.h"
+#include "librpc/gen_ndr/cli_wbint.h"
+
+struct wb_seqnums_state {
+	int num_domains;
+	int num_received;
+
+	struct tevent_req **subreqs;
+	struct winbindd_domain **domains;
+	NTSTATUS *stati;
+	uint32_t *seqnums;
+};
+
+static void wb_seqnums_done(struct tevent_req *subreq);
+
+struct tevent_req *wb_seqnums_send(TALLOC_CTX *mem_ctx,
+				   struct tevent_context *ev)
+{
+	struct tevent_req *req;
+	struct wb_seqnums_state *state;
+	struct winbindd_domain *domain;
+	int i;
+
+	req = tevent_req_create(mem_ctx, &state, struct wb_seqnums_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->num_received = 0;
+	state->num_domains = 0;
+
+	for (domain = domain_list(); domain != NULL; domain = domain->next) {
+		state->num_domains += 1;
+	}
+
+	state->subreqs = talloc_array(state, struct tevent_req *,
+				      state->num_domains);
+	state->domains = talloc_array(state, struct winbindd_domain *,
+				      state->num_domains);
+	state->stati = talloc_array(state, NTSTATUS, state->num_domains);
+	state->seqnums = talloc_array(state, uint32_t, state->num_domains);
+
+	if ((state->subreqs == NULL) || (state->domains == NULL) ||
+	    (state->stati == NULL) || (state->seqnums == NULL)) {
+		tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
+		return tevent_req_post(req, ev);
+	}
+
+	i = 0;
+
+	for (domain = domain_list(); domain != NULL; domain = domain->next) {
+		state->domains[i] = domain;
+		state->subreqs[i] = wb_seqnum_send(state->subreqs, ev, domain);
+		if (tevent_req_nomem(state->subreqs[i], req)) {
+			/* Don't even start all the other requests */
+			TALLOC_FREE(state->subreqs);
+			return tevent_req_post(req, ev);
+		}
+		tevent_req_set_callback(state->subreqs[i], wb_seqnums_done,
+					req);
+		i += 1;
+	}
+	return req;
+}
+
+static void wb_seqnums_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct wb_seqnums_state *state = tevent_req_data(
+		req, struct wb_seqnums_state);
+	NTSTATUS status;
+	uint32_t seqnum;
+	int i;
+
+	status = wb_seqnum_recv(subreq, &seqnum);
+
+	for (i=0; i<state->num_domains; i++) {
+		if (subreq == state->subreqs[i]) {
+			state->subreqs[i] = NULL;
+			state->stati[i] = status;
+			if (NT_STATUS_IS_OK(status)) {
+				state->seqnums[i] = seqnum;
+				state->domains[i]->sequence_number = seqnum;
+			}
+			break;
+		}
+	}
+	TALLOC_FREE(subreq);
+
+	state->num_received += 1;
+
+	if (state->num_received >= state->num_domains) {
+		tevent_req_done(req);
+	}
+}
+
+NTSTATUS wb_seqnums_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			 int *num_domains, struct winbindd_domain ***domains,
+			 NTSTATUS **stati, uint32_t **seqnums)
+{
+	struct wb_seqnums_state *state = tevent_req_data(
+		req, struct wb_seqnums_state);
+	NTSTATUS status;
+
+	if (tevent_req_is_nterror(req, &status)) {
+		return status;
+	}
+	*num_domains = state->num_domains;
+	*domains = talloc_move(mem_ctx, &state->domains);
+	*stati = talloc_move(mem_ctx, &state->stati);
+	*seqnums = talloc_move(mem_ctx, &state->seqnums);
+	return NT_STATUS_OK;
+}
diff --git a/source3/winbindd/winbindd_proto.h b/source3/winbindd/winbindd_proto.h
index 1638b0be62..a144c99c80 100644
--- a/source3/winbindd/winbindd_proto.h
+++ b/source3/winbindd/winbindd_proto.h
@@ -772,5 +772,10 @@ struct tevent_req *wb_seqnum_send(TALLOC_CTX *mem_ctx,
 				  struct winbindd_domain *domain);
 NTSTATUS wb_seqnum_recv(struct tevent_req *req, uint32_t *seqnum);
 
+struct tevent_req *wb_seqnums_send(TALLOC_CTX *mem_ctx,
+				   struct tevent_context *ev);
+NTSTATUS wb_seqnums_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			 int *num_domains, struct winbindd_domain ***domains,
+			 NTSTATUS **stati, uint32_t **seqnums);
 
 #endif /*  _WINBINDD_PROTO_H_  */