1 files changed, 199 insertions, 0 deletions
diff --git a/source4/libcli/composite/composite.c b/source4/libcli/composite/composite.c
new file mode 100644
index 0000000..3598637
--- /dev/null
+++ b/source4/libcli/composite/composite.c
@@ -0,0 +1,199 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   Copyright (C) Volker Lendecke 2005
+   Copyright (C) Andrew Tridgell 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/>.
+*/
+/*
+  composite API helper functions
+*/
+
+#include "includes.h"
+#include "lib/events/events.h"
+#include "libcli/smb2/smb2.h"
+#include "libcli/composite/composite.h"
+#include "../libcli/nbt/libnbt.h"
+
+/*
+ create a new composite_context structure
+ and initialize it
+*/
+_PUBLIC_ struct composite_context *composite_create(TALLOC_CTX *mem_ctx,
+						    struct tevent_context *ev)
+{
+	struct composite_context *c;
+
+	c = talloc_zero(mem_ctx, struct composite_context);
+	if (!c) return NULL;
+	c->state = COMPOSITE_STATE_IN_PROGRESS;
+	c->event_ctx = ev;
+
+	return c;
+}
+
+/*
+  block until a composite function has completed, then return the status
+*/
+_PUBLIC_ NTSTATUS composite_wait(struct composite_context *c)
+{
+	if (c == NULL) return NT_STATUS_NO_MEMORY;
+
+	c->used_wait = true;
+
+	while (c->state < COMPOSITE_STATE_DONE) {
+		if (tevent_loop_once(c->event_ctx) != 0) {
+			return NT_STATUS_UNSUCCESSFUL;
+		}
+	}
+
+	return c->status;
+}
+
+/*
+  block until a composite function has completed, then return the status. 
+  Free the composite context before returning
+*/
+_PUBLIC_ NTSTATUS composite_wait_free(struct composite_context *c)
+{
+	NTSTATUS status = composite_wait(c);
+	talloc_free(c);
+	return status;
+}
+
+/* 
+   callback from composite_done() and composite_error()
+
+   this is used to allow for a composite function to complete without
+   going through any state transitions. When that happens the caller
+   has had no opportunity to fill in the async callback fields
+   (ctx->async.fn and ctx->async.private_data) which means the usual way of
+   dealing with composite functions doesn't work. To cope with this,
+   we trigger a timer event that will happen then the event loop is
+   re-entered. This gives the caller a chance to setup the callback,
+   and allows the caller to ignore the fact that the composite
+   function completed early
+*/
+static void composite_trigger(struct tevent_context *ev, struct tevent_timer *te,
+			      struct timeval t, void *ptr)
+{
+	struct composite_context *c = talloc_get_type(ptr, struct composite_context);
+	if (c->async.fn) {
+		c->async.fn(c);
+	}
+}
+
+
+_PUBLIC_ void composite_error(struct composite_context *ctx, NTSTATUS status)
+{
+	/* you are allowed to pass NT_STATUS_OK to composite_error(), in which
+	   case it is equivalent to composite_done() */
+	if (NT_STATUS_IS_OK(status)) {
+		composite_done(ctx);
+		return;
+	}
+	if (!ctx->used_wait && !ctx->async.fn) {
+		tevent_add_timer(ctx->event_ctx, ctx, timeval_zero(), composite_trigger, ctx);
+	}
+	ctx->status = status;
+	ctx->state = COMPOSITE_STATE_ERROR;
+	if (ctx->async.fn != NULL) {
+		ctx->async.fn(ctx);
+	}
+}
+
+_PUBLIC_ bool composite_nomem(const void *p, struct composite_context *ctx)
+{
+	if (p != NULL) {
+		return false;
+	}
+	composite_error(ctx, NT_STATUS_NO_MEMORY);
+	return true;
+}
+
+_PUBLIC_ bool composite_is_ok(struct composite_context *ctx)
+{
+	if (NT_STATUS_IS_OK(ctx->status)) {
+		return true;
+	}
+	composite_error(ctx, ctx->status);
+	return false;
+}
+
+_PUBLIC_ void composite_done(struct composite_context *ctx)
+{
+	if (!ctx->used_wait && !ctx->async.fn) {
+		tevent_add_timer(ctx->event_ctx, ctx, timeval_zero(), composite_trigger, ctx);
+	}
+	ctx->state = COMPOSITE_STATE_DONE;
+	if (ctx->async.fn != NULL) {
+		ctx->async.fn(ctx);
+	}
+}
+
+_PUBLIC_ void composite_continue(struct composite_context *ctx,
+				 struct composite_context *new_ctx,
+				 void (*continuation)(struct composite_context *),
+				 void *private_data)
+{
+	if (composite_nomem(new_ctx, ctx)) return;
+	new_ctx->async.fn = continuation;
+	new_ctx->async.private_data = private_data;
+
+	/* if we are setting up a continuation, and the context has
+	   already finished, then we should run the callback with an
+	   immediate event, otherwise we can be stuck forever */
+	if (new_ctx->state >= COMPOSITE_STATE_DONE && continuation) {
+		tevent_add_timer(new_ctx->event_ctx, new_ctx, timeval_zero(), composite_trigger, new_ctx);
+	}
+}
+
+_PUBLIC_ void composite_continue_smb(struct composite_context *ctx,
+				     struct smbcli_request *new_req,
+				     void (*continuation)(struct smbcli_request *),
+				     void *private_data)
+{
+	if (composite_nomem(new_req, ctx)) return;
+	if (new_req->state > SMBCLI_REQUEST_RECV) {
+		composite_error(ctx, new_req->status);
+		return;
+	}
+	new_req->async.fn = continuation;
+	new_req->async.private_data = private_data;
+}
+
+_PUBLIC_ void composite_continue_smb2(struct composite_context *ctx,
+				      struct smb2_request *new_req,
+				      void (*continuation)(struct smb2_request *),
+				      void *private_data)
+{
+	if (composite_nomem(new_req, ctx)) return;
+	if (new_req->state > SMB2_REQUEST_RECV) {
+		composite_error(ctx, new_req->status);
+		return;
+	}
+	new_req->async.fn = continuation;
+	new_req->async.private_data = private_data;
+}
+
+_PUBLIC_ void composite_continue_nbt(struct composite_context *ctx,
+				     struct nbt_name_request *new_req,
+				     void (*continuation)(struct nbt_name_request *),
+				     void *private_data)
+{
+	if (composite_nomem(new_req, ctx)) return;
+	new_req->async.fn = continuation;
+	new_req->async.private_data = private_data;
+}