Add infrastructure to transfer winbindd_request/response asynchronously

2 files changed, 582 insertions, 0 deletions

diff --git a/source3/winbindd/winbindd_proto.h b/source3/winbindd/winbindd_proto.h
index 9de385e3b3..3869ac5771 100644
--- a/source3/winbindd/winbindd_proto.h
+++ b/source3/winbindd/winbindd_proto.h
@@ -67,6 +67,27 @@ void winbind_check_sighup(const char *lfile);
 void winbind_check_sigterm(bool in_parent);
 int main(int argc, char **argv, char **envp);
 
+/* The following definitions come from winbindd/winbindd_reqtrans.c  */
+
+struct async_req *wb_req_read_send(TALLOC_CTX *mem_ctx,
+				   struct event_context *ev,
+				   int fd, size_t max_extra_data);
+NTSTATUS wb_req_read_recv(struct async_req *req, TALLOC_CTX *mem_ctx,
+			  struct winbindd_request **preq);
+struct async_req *wb_req_write_send(TALLOC_CTX *mem_ctx,
+				    struct event_context *ev, int fd,
+				    struct winbindd_request *wb_req);
+NTSTATUS wb_req_write_recv(struct async_req *req);
+
+struct async_req *wb_resp_read_send(TALLOC_CTX *mem_ctx,
+				    struct event_context *ev, int fd);
+NTSTATUS wb_resp_read_recv(struct async_req *req, TALLOC_CTX *mem_ctx,
+			   struct winbindd_response **presp);
+struct async_req *wb_resp_write_send(TALLOC_CTX *mem_ctx,
+				     struct event_context *ev, int fd,
+				     struct winbindd_response *wb_resp);
+NTSTATUS wb_resp_write_recv(struct async_req *req);
+
 /* The following definitions come from winbindd/winbindd_ads.c  */
 
 
diff --git a/source3/winbindd/winbindd_reqtrans.c b/source3/winbindd/winbindd_reqtrans.c
new file mode 100644
index 0000000000..e9901e173f
--- /dev/null
+++ b/source3/winbindd/winbindd_reqtrans.c
@@ -0,0 +1,561 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   Async transfer of winbindd_request and _response structs
+
+   Copyright (C) Volker Lendecke 2008
+
+   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"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_WINBIND
+
+struct req_read_state {
+	struct winbindd_request *wb_req;
+	struct event_context *ev;
+	size_t max_extra_data;
+	int fd;
+};
+
+static void wb_req_read_len(struct async_req *subreq);
+static void wb_req_read_main(struct async_req *subreq);
+static void wb_req_read_extra(struct async_req *subreq);
+
+struct async_req *wb_req_read_send(TALLOC_CTX *mem_ctx,
+				   struct event_context *ev,
+				   int fd, size_t max_extra_data)
+{
+	struct async_req *result, *subreq;
+	struct req_read_state *state;
+
+	result = async_req_new(mem_ctx, ev);
+	if (result == NULL) {
+		return NULL;
+	}
+
+	state = talloc(result, struct req_read_state);
+	if (state == NULL) {
+		goto nomem;
+	}
+	result->private_data = state;
+
+	state->fd = fd;
+	state->ev = ev;
+	state->max_extra_data = max_extra_data;
+	state->wb_req = talloc(state, struct winbindd_request);
+	if (state->wb_req == NULL) {
+		goto nomem;
+	}
+
+	subreq = recvall_send(state, ev, state->fd, &(state->wb_req->length),
+			      sizeof(state->wb_req->length), 0);
+	if (subreq == NULL) {
+		goto nomem;
+	}
+
+	subreq->async.fn = wb_req_read_len;
+	subreq->async.priv = result;
+	return result;
+
+ nomem:
+	TALLOC_FREE(result);
+	return NULL;
+}
+
+static void wb_req_read_len(struct async_req *subreq)
+{
+	struct async_req *req = talloc_get_type_abort(
+		subreq->async.priv, struct async_req);
+	struct req_read_state *state = talloc_get_type_abort(
+		req->private_data, struct req_read_state);
+	NTSTATUS status;
+
+	status = recvall_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status)) {
+		async_req_error(req, status);
+		return;
+	}
+
+	if (state->wb_req->length != sizeof(struct winbindd_request)) {
+		DEBUG(0, ("wb_req_read_len: Invalid request size received: "
+			  "%d (expected %d)\n", (int)state->wb_req->length,
+			  (int)sizeof(struct winbindd_request)));
+		async_req_error(req, NT_STATUS_INVALID_BUFFER_SIZE);
+		return;
+	}
+
+	subreq = recvall_send(
+		req, state->ev, state->fd, (uint32 *)(state->wb_req)+1,
+		sizeof(struct winbindd_request) - sizeof(uint32), 0);
+	if (subreq == NULL) {
+		async_req_error(req, NT_STATUS_NO_MEMORY);
+		return;
+	}
+
+	subreq->async.fn = wb_req_read_main;
+	subreq->async.priv = req;
+}
+
+static void wb_req_read_main(struct async_req *subreq)
+{
+	struct async_req *req = talloc_get_type_abort(
+		subreq->async.priv, struct async_req);
+	struct req_read_state *state = talloc_get_type_abort(
+		req->private_data, struct req_read_state);
+	NTSTATUS status;
+
+	status = recvall_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status)) {
+		async_req_error(req, status);
+		return;
+	}
+
+	if ((state->max_extra_data != 0)
+	    && (state->wb_req->extra_len > state->max_extra_data)) {
+		DEBUG(3, ("Got request with %d bytes extra data on "
+			  "unprivileged socket\n",
+			  (int)state->wb_req->extra_len));
+		async_req_error(req, NT_STATUS_INVALID_BUFFER_SIZE);
+		return;
+	}
+
+	if (state->wb_req->extra_len == 0) {
+		async_req_done(req);
+		return;
+	}
+
+	state->wb_req->extra_data.data = TALLOC_ARRAY(
+		state->wb_req, char, state->wb_req->extra_len + 1);
+	if (state->wb_req->extra_data.data == NULL) {
+		async_req_error(req, NT_STATUS_NO_MEMORY);
+		return;
+	}
+	state->wb_req->extra_data.data[state->wb_req->extra_len] = 0;
+
+	subreq = recvall_send(
+		req, state->ev, state->fd, state->wb_req->extra_data.data,
+		state->wb_req->extra_len, 0);
+	if (subreq == NULL) {
+		async_req_error(req, NT_STATUS_NO_MEMORY);
+		return;
+	}
+
+	subreq->async.fn = wb_req_read_extra;
+	subreq->async.priv = req;
+}
+
+static void wb_req_read_extra(struct async_req *subreq)
+{
+	struct async_req *req = talloc_get_type_abort(
+		subreq->async.priv, struct async_req);
+	NTSTATUS status;
+
+	status = recvall_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status)) {
+		async_req_error(req, status);
+		return;
+	}
+	async_req_done(req);
+}
+
+
+NTSTATUS wb_req_read_recv(struct async_req *req, TALLOC_CTX *mem_ctx,
+			  struct winbindd_request **preq)
+{
+	struct req_read_state *state = talloc_get_type_abort(
+		req->private_data, struct req_read_state);
+
+	SMB_ASSERT(req->state >= ASYNC_REQ_DONE);
+	if (req->state == ASYNC_REQ_ERROR) {
+		return req->status;
+	}
+
+	*preq = talloc_move(mem_ctx, &state->wb_req);
+	return NT_STATUS_OK;
+}
+
+struct req_write_state {
+	struct winbindd_request *wb_req;
+	struct event_context *ev;
+	int fd;
+};
+
+static void wb_req_write_main(struct async_req *subreq);
+static void wb_req_write_extra(struct async_req *subreq);
+
+struct async_req *wb_req_write_send(TALLOC_CTX *mem_ctx,
+				    struct event_context *ev, int fd,
+				    struct winbindd_request *wb_req)
+{
+	struct async_req *result, *subreq;
+	struct req_write_state *state;
+
+	result = async_req_new(mem_ctx, ev);
+	if (result == NULL) {
+		return NULL;
+	}
+
+	state = talloc(result, struct req_write_state);
+	if (state == NULL) {
+		goto nomem;
+	}
+	result->private_data = state;
+
+	state->fd = fd;
+	state->ev = ev;
+	state->wb_req = wb_req;
+
+	subreq = sendall_send(state, state->ev, state->fd, state->wb_req,
+			      sizeof(struct winbindd_request), 0);
+	if (subreq == NULL) {
+		goto nomem;
+	}
+
+	subreq->async.fn = wb_req_write_main;
+	subreq->async.priv = result;
+	return result;
+
+ nomem:
+	TALLOC_FREE(result);
+	return NULL;
+}
+
+static void wb_req_write_main(struct async_req *subreq)
+{
+	struct async_req *req = talloc_get_type_abort(
+		subreq->async.priv, struct async_req);
+	struct req_write_state *state = talloc_get_type_abort(
+		req->private_data, struct req_write_state);
+	NTSTATUS status;
+
+	status = sendall_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status)) {
+		async_req_error(req, status);
+		return;
+	}
+
+	if (state->wb_req->extra_len == 0) {
+		async_req_done(req);
+		return;
+	}
+
+	subreq = sendall_send(state, state->ev, state->fd,
+			      state->wb_req->extra_data.data,
+			      state->wb_req->extra_len, 0);
+	if (subreq == NULL) {
+		async_req_error(req, NT_STATUS_NO_MEMORY);
+		return;
+	}
+
+	subreq->async.fn = wb_req_write_extra;
+	subreq->async.priv = req;
+}
+
+static void wb_req_write_extra(struct async_req *subreq)
+{
+	struct async_req *req = talloc_get_type_abort(
+		subreq->async.priv, struct async_req);
+	NTSTATUS status;
+
+	status = sendall_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status)) {
+		async_req_error(req, status);
+		return;
+	}
+
+	async_req_done(req);
+}
+
+NTSTATUS wb_req_write_recv(struct async_req *req)
+{
+	SMB_ASSERT(req->state >= ASYNC_REQ_DONE);
+	if (req->state == ASYNC_REQ_ERROR) {
+		return req->status;
+	}
+
+	return NT_STATUS_OK;
+}
+
+struct resp_read_state {
+	struct winbindd_response *wb_resp;
+	struct event_context *ev;
+	size_t max_extra_data;
+	int fd;
+};
+
+static void wb_resp_read_len(struct async_req *subreq);
+static void wb_resp_read_main(struct async_req *subreq);
+static void wb_resp_read_extra(struct async_req *subreq);
+
+struct async_req *wb_resp_read_send(TALLOC_CTX *mem_ctx,
+				    struct event_context *ev, int fd)
+{
+	struct async_req *result, *subreq;
+	struct resp_read_state *state;
+
+	result = async_req_new(mem_ctx, ev);
+	if (result == NULL) {
+		return NULL;
+	}
+
+	state = talloc(result, struct resp_read_state);
+	if (state == NULL) {
+		goto nomem;
+	}
+	result->private_data = state;
+
+	state->fd = fd;
+	state->ev = ev;
+	state->wb_resp = talloc(state, struct winbindd_response);
+	if (state->wb_resp == NULL) {
+		goto nomem;
+	}
+
+	subreq = recvall_send(state, ev, state->fd, &(state->wb_resp->length),
+			      sizeof(state->wb_resp->length), 0);
+	if (subreq == NULL) {
+		goto nomem;
+	}
+
+	subreq->async.fn = wb_resp_read_len;
+	subreq->async.priv = result;
+	return result;
+
+ nomem:
+	TALLOC_FREE(result);
+	return NULL;
+}
+
+static void wb_resp_read_len(struct async_req *subreq)
+{
+	struct async_req *req = talloc_get_type_abort(
+		subreq->async.priv, struct async_req);
+	struct resp_read_state *state = talloc_get_type_abort(
+		req->private_data, struct resp_read_state);
+	NTSTATUS status;
+
+	status = recvall_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status)) {
+		async_req_error(req, status);
+		return;
+	}
+
+	if (state->wb_resp->length < sizeof(struct winbindd_response)) {
+		DEBUG(0, ("wb_resp_read_len: Invalid response size received: "
+			  "%d (expected at least%d)\n",
+			  (int)state->wb_resp->length,
+			  (int)sizeof(struct winbindd_response)));
+		async_req_error(req, NT_STATUS_INVALID_BUFFER_SIZE);
+		return;
+	}
+
+	subreq = recvall_send(
+		req, state->ev, state->fd, (uint32 *)(state->wb_resp)+1,
+		sizeof(struct winbindd_response) - sizeof(uint32), 0);
+	if (subreq == NULL) {
+		async_req_error(req, NT_STATUS_NO_MEMORY);
+		return;
+	}
+
+	subreq->async.fn = wb_resp_read_main;
+	subreq->async.priv = req;
+}
+
+static void wb_resp_read_main(struct async_req *subreq)
+{
+	struct async_req *req = talloc_get_type_abort(
+		subreq->async.priv, struct async_req);
+	struct resp_read_state *state = talloc_get_type_abort(
+		req->private_data, struct resp_read_state);
+	NTSTATUS status;
+	size_t extra_len;
+
+	status = recvall_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status)) {
+		async_req_error(req, status);
+		return;
+	}
+
+	extra_len = state->wb_resp->length - sizeof(struct winbindd_response);
+	if (extra_len == 0) {
+		async_req_done(req);
+		return;
+	}
+
+	state->wb_resp->extra_data.data = TALLOC_ARRAY(
+		state->wb_resp, char, extra_len+1);
+	if (state->wb_resp->extra_data.data == NULL) {
+		async_req_error(req, NT_STATUS_NO_MEMORY);
+		return;
+	}
+	((char *)state->wb_resp->extra_data.data)[extra_len] = 0;
+
+	subreq = recvall_send(
+		req, state->ev, state->fd, state->wb_resp->extra_data.data,
+		extra_len, 0);
+	if (subreq == NULL) {
+		async_req_error(req, NT_STATUS_NO_MEMORY);
+		return;
+	}
+
+	subreq->async.fn = wb_resp_read_extra;
+	subreq->async.priv = req;
+}
+
+static void wb_resp_read_extra(struct async_req *subreq)
+{
+	struct async_req *req = talloc_get_type_abort(
+		subreq->async.priv, struct async_req);
+	NTSTATUS status;
+
+	status = recvall_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status)) {
+		async_req_error(req, status);
+		return;
+	}
+	async_req_done(req);
+}
+
+
+NTSTATUS wb_resp_read_recv(struct async_req *req, TALLOC_CTX *mem_ctx,
+			   struct winbindd_response **presp)
+{
+	struct resp_read_state *state = talloc_get_type_abort(
+		req->private_data, struct resp_read_state);
+
+	SMB_ASSERT(req->state >= ASYNC_REQ_DONE);
+	if (req->state == ASYNC_REQ_ERROR) {
+		return req->status;
+	}
+
+	*presp = talloc_move(mem_ctx, &state->wb_resp);
+	return NT_STATUS_OK;
+}
+
+struct resp_write_state {
+	struct winbindd_response *wb_resp;
+	struct event_context *ev;
+	int fd;
+};
+
+static void wb_resp_write_main(struct async_req *subreq);
+static void wb_resp_write_extra(struct async_req *subreq);
+
+struct async_req *wb_resp_write_send(TALLOC_CTX *mem_ctx,
+				    struct event_context *ev, int fd,
+				    struct winbindd_response *wb_resp)
+{
+	struct async_req *result, *subreq;
+	struct resp_write_state *state;
+
+	result = async_req_new(mem_ctx, ev);
+	if (result == NULL) {
+		return NULL;
+	}
+
+	state = talloc(result, struct resp_write_state);
+	if (state == NULL) {
+		goto nomem;
+	}
+	result->private_data = state;
+
+	state->fd = fd;
+	state->ev = ev;
+	state->wb_resp = wb_resp;
+
+	subreq = sendall_send(state, state->ev, state->fd, state->wb_resp,
+			      sizeof(struct winbindd_response), 0);
+	if (subreq == NULL) {
+		goto nomem;
+	}
+
+	subreq->async.fn = wb_resp_write_main;
+	subreq->async.priv = result;
+	return result;
+
+ nomem:
+	TALLOC_FREE(result);
+	return NULL;
+}
+
+static void wb_resp_write_main(struct async_req *subreq)
+{
+	struct async_req *req = talloc_get_type_abort(
+		subreq->async.priv, struct async_req);
+	struct resp_write_state *state = talloc_get_type_abort(
+		req->private_data, struct resp_write_state);
+	NTSTATUS status;
+
+	status = sendall_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status)) {
+		async_req_error(req, status);
+		return;
+	}
+
+	if (state->wb_resp->length == sizeof(struct winbindd_response)) {
+		async_req_done(req);
+		return;
+	}
+
+	subreq = sendall_send(
+		state, state->ev, state->fd,
+		state->wb_resp->extra_data.data,
+		state->wb_resp->length - sizeof(struct winbindd_response), 0);
+	if (subreq == 0) {
+		async_req_error(req, NT_STATUS_NO_MEMORY);
+		return;
+	}
+
+	subreq->async.fn = wb_resp_write_extra;
+	subreq->async.priv = req;
+}
+
+static void wb_resp_write_extra(struct async_req *subreq)
+{
+	struct async_req *req = talloc_get_type_abort(
+		subreq->async.priv, struct async_req);
+	NTSTATUS status;
+
+	status = sendall_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status)) {
+		async_req_error(req, status);
+		return;
+	}
+
+	async_req_done(req);
+}
+
+NTSTATUS wb_resp_write_recv(struct async_req *req)
+{
+	SMB_ASSERT(req->state >= ASYNC_REQ_DONE);
+	if (req->state == ASYNC_REQ_ERROR) {
+		return req->status;
+	}
+
+	return NT_STATUS_OK;
+}