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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 17:20:00 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 17:20:00 +0000
commit8daa83a594a2e98f39d764422bfbdbc62c9efd44 (patch)
tree4099e8021376c7d8c05bdf8503093d80e9c7bad0 /source4/libcli/composite/composite.c
parentInitial commit. (diff)
downloadsamba-8daa83a594a2e98f39d764422bfbdbc62c9efd44.tar.xz
samba-8daa83a594a2e98f39d764422bfbdbc62c9efd44.zip
Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'source4/libcli/composite/composite.c')
-rw-r--r--source4/libcli/composite/composite.c199
1 files changed, 199 insertions, 0 deletions
diff --git a/source4/libcli/composite/composite.c b/source4/libcli/composite/composite.c
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+/*
+ 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;
+}