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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/raw/libcliraw.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;
}
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