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6cf443ab1f
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14170 Signed-off-by: Andrew Bartlett <abartlet@samba.org> Reviewed-by: Volker Lendecke <vl@samba.org> Reviewed-by: Andreas Schneider <asn@samba.org> Autobuild-User(master): Andrew Bartlett <abartlet@samba.org> Autobuild-Date(master): Sun Nov 10 22:27:47 UTC 2019 on sn-devel-184
200 lines
5.7 KiB
C
200 lines
5.7 KiB
C
/*
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Unix SMB/CIFS implementation.
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Copyright (C) Volker Lendecke 2005
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Copyright (C) Andrew Tridgell 2005
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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composite API helper functions
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*/
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#include "includes.h"
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#include "lib/events/events.h"
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#include "libcli/smb2/smb2.h"
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#include "libcli/composite/composite.h"
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#include "../libcli/nbt/libnbt.h"
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/*
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create a new composite_context structure
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and initialize it
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*/
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_PUBLIC_ struct composite_context *composite_create(TALLOC_CTX *mem_ctx,
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struct tevent_context *ev)
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{
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struct composite_context *c;
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c = talloc_zero(mem_ctx, struct composite_context);
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if (!c) return NULL;
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c->state = COMPOSITE_STATE_IN_PROGRESS;
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c->event_ctx = ev;
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return c;
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}
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/*
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block until a composite function has completed, then return the status
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*/
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_PUBLIC_ NTSTATUS composite_wait(struct composite_context *c)
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{
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if (c == NULL) return NT_STATUS_NO_MEMORY;
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c->used_wait = true;
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while (c->state < COMPOSITE_STATE_DONE) {
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if (tevent_loop_once(c->event_ctx) != 0) {
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return NT_STATUS_UNSUCCESSFUL;
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}
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}
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return c->status;
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}
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/*
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block until a composite function has completed, then return the status.
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Free the composite context before returning
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*/
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_PUBLIC_ NTSTATUS composite_wait_free(struct composite_context *c)
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{
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NTSTATUS status = composite_wait(c);
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talloc_free(c);
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return status;
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}
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/*
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callback from composite_done() and composite_error()
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this is used to allow for a composite function to complete without
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going through any state transitions. When that happens the caller
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has had no opportunity to fill in the async callback fields
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(ctx->async.fn and ctx->async.private_data) which means the usual way of
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dealing with composite functions doesn't work. To cope with this,
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we trigger a timer event that will happen then the event loop is
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re-entered. This gives the caller a chance to setup the callback,
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and allows the caller to ignore the fact that the composite
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function completed early
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*/
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static void composite_trigger(struct tevent_context *ev, struct tevent_timer *te,
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struct timeval t, void *ptr)
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{
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struct composite_context *c = talloc_get_type(ptr, struct composite_context);
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if (c->async.fn) {
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c->async.fn(c);
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}
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}
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_PUBLIC_ void composite_error(struct composite_context *ctx, NTSTATUS status)
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{
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/* you are allowed to pass NT_STATUS_OK to composite_error(), in which
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case it is equivalent to composite_done() */
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if (NT_STATUS_IS_OK(status)) {
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composite_done(ctx);
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return;
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}
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if (!ctx->used_wait && !ctx->async.fn) {
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tevent_add_timer(ctx->event_ctx, ctx, timeval_zero(), composite_trigger, ctx);
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}
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ctx->status = status;
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ctx->state = COMPOSITE_STATE_ERROR;
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if (ctx->async.fn != NULL) {
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ctx->async.fn(ctx);
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}
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}
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_PUBLIC_ bool composite_nomem(const void *p, struct composite_context *ctx)
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{
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if (p != NULL) {
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return false;
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}
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composite_error(ctx, NT_STATUS_NO_MEMORY);
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return true;
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}
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_PUBLIC_ bool composite_is_ok(struct composite_context *ctx)
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{
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if (NT_STATUS_IS_OK(ctx->status)) {
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return true;
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}
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composite_error(ctx, ctx->status);
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return false;
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}
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_PUBLIC_ void composite_done(struct composite_context *ctx)
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{
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if (!ctx->used_wait && !ctx->async.fn) {
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tevent_add_timer(ctx->event_ctx, ctx, timeval_zero(), composite_trigger, ctx);
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}
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ctx->state = COMPOSITE_STATE_DONE;
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if (ctx->async.fn != NULL) {
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ctx->async.fn(ctx);
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}
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}
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_PUBLIC_ void composite_continue(struct composite_context *ctx,
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struct composite_context *new_ctx,
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void (*continuation)(struct composite_context *),
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void *private_data)
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{
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if (composite_nomem(new_ctx, ctx)) return;
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new_ctx->async.fn = continuation;
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new_ctx->async.private_data = private_data;
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/* if we are setting up a continuation, and the context has
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already finished, then we should run the callback with an
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immediate event, otherwise we can be stuck forever */
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if (new_ctx->state >= COMPOSITE_STATE_DONE && continuation) {
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tevent_add_timer(new_ctx->event_ctx, new_ctx, timeval_zero(), composite_trigger, new_ctx);
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}
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}
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_PUBLIC_ void composite_continue_smb(struct composite_context *ctx,
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struct smbcli_request *new_req,
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void (*continuation)(struct smbcli_request *),
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void *private_data)
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{
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if (composite_nomem(new_req, ctx)) return;
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if (new_req->state > SMBCLI_REQUEST_RECV) {
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composite_error(ctx, new_req->status);
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return;
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}
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new_req->async.fn = continuation;
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new_req->async.private_data = private_data;
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}
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_PUBLIC_ void composite_continue_smb2(struct composite_context *ctx,
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struct smb2_request *new_req,
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void (*continuation)(struct smb2_request *),
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void *private_data)
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{
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if (composite_nomem(new_req, ctx)) return;
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if (new_req->state > SMB2_REQUEST_RECV) {
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composite_error(ctx, new_req->status);
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return;
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}
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new_req->async.fn = continuation;
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new_req->async.private_data = private_data;
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}
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_PUBLIC_ void composite_continue_nbt(struct composite_context *ctx,
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struct nbt_name_request *new_req,
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void (*continuation)(struct nbt_name_request *),
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void *private_data)
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{
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if (composite_nomem(new_req, ctx)) return;
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new_req->async.fn = continuation;
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new_req->async.private_data = private_data;
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}
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