+/*
+ Unix SMB/CIFS implementation.
+
+ Provide parent->child communication based on NDR marshalling
+
+ Copyright (C) Volker Lendecke 2009
+
+ 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/>.
+*/
+
+/*
+ * This file implements an RPC between winbind parent and child processes,
+ * leveraging the autogenerated marshalling routines for MSRPC. This is not
+ * MSRPC, as it does not go through the whole DCERPC fragmentation, we just
+ * leverage much the same infrastructure we already have for it.
+ */
+
+#include "includes.h"
+#include "winbindd/winbindd.h"
+#include "winbindd/winbindd_proto.h"
+#include "librpc/gen_ndr/srv_wbint.h"
+
+struct wb_ndr_transport_priv {
+ struct winbindd_child *child;
+};
+
+struct wb_ndr_dispatch_state {
+ const struct ndr_interface_call *call;
+ void *r;
+ struct ndr_push *push;
+ struct winbindd_request request;
+ struct winbindd_response *response;
+};
+
+static void wb_ndr_dispatch_done(struct tevent_req *subreq);
+
+static struct tevent_req *wb_ndr_dispatch_send(TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev,
+ struct rpc_pipe_client *cli,
+ const struct ndr_interface_table *table,
+ uint32_t opnum,
+ void *r)
+{
+ struct tevent_req *req, *subreq;
+ struct wb_ndr_dispatch_state *state;
+ struct wb_ndr_transport_priv *transport = talloc_get_type_abort(
+ cli->transport->priv, struct wb_ndr_transport_priv);
+ DATA_BLOB blob;
+ enum ndr_err_code ndr_err;
+
+ req = tevent_req_create(mem_ctx, &state,
+ struct wb_ndr_dispatch_state);
+ if (req == NULL) {
+ return NULL;
+ }
+
+ state->r = r;
+ state->call = &table->calls[opnum];
+
+ state->push = ndr_push_init_ctx(state, NULL);
+ if (tevent_req_nomem(state->push, req)) {
+ return tevent_req_post(req, ev);
+ }
+
+ ndr_err = state->call->ndr_push(state->push, NDR_IN, r);
+ if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+ tevent_req_nterror(req, ndr_map_error2ntstatus(ndr_err));
+ TALLOC_FREE(state->push);
+ return tevent_req_post(req, ev);
+ }
+
+ blob = ndr_push_blob(state->push);
+
+ state->request.cmd = WINBINDD_DUAL_NDRCMD;
+ state->request.data.ndrcmd = opnum;
+ state->request.extra_data.data = (char *)blob.data;
+ state->request.extra_len = blob.length;
+
+ subreq = wb_child_request_send(state, ev, transport->child,
+ &state->request);
+ if (tevent_req_nomem(subreq, req)) {
+ return tevent_req_post(req, ev);
+ }
+ tevent_req_set_callback(subreq, wb_ndr_dispatch_done, req);
+ return req;
+}
+
+static void wb_ndr_dispatch_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct wb_ndr_dispatch_state *state = tevent_req_data(
+ req, struct wb_ndr_dispatch_state);
+ int ret, err;
+
+ ret = wb_child_request_recv(subreq, state, &state->response, &err);
+ TALLOC_FREE(subreq);
+ if (ret == -1) {
+ tevent_req_nterror(req, map_nt_error_from_unix(err));
+ return;
+ }
+ tevent_req_done(req);
+}
+
+static NTSTATUS wb_ndr_dispatch_recv(struct tevent_req *req,
+ TALLOC_CTX *mem_ctx)
+{
+ struct wb_ndr_dispatch_state *state = tevent_req_data(
+ req, struct wb_ndr_dispatch_state);
+ NTSTATUS status;
+ struct ndr_pull *pull;
+ enum ndr_err_code ndr_err;
+ DATA_BLOB blob;
+
+ if (tevent_req_is_nterror(req, &status)) {
+ return status;
+ }
+
+ blob.data = (uint8_t *)state->response->extra_data.data;
+ blob.length = state->response->length
+ - sizeof(struct winbindd_response);
+
+ pull = ndr_pull_init_blob(&blob, mem_ctx, NULL);
+ if (pull == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ /* have the ndr parser alloc memory for us */
+ pull->flags |= LIBNDR_FLAG_REF_ALLOC;
+ ndr_err = state->call->ndr_pull(pull, NDR_OUT, state->r);
+ TALLOC_FREE(pull);
+
+ if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+ return ndr_map_error2ntstatus(ndr_err);
+ }
+
+ return NT_STATUS_OK;
+}
+
+static NTSTATUS wb_ndr_dispatch(struct rpc_pipe_client *cli,
+ TALLOC_CTX *mem_ctx,
+ const struct ndr_interface_table *table,
+ uint32_t opnum, void *r)
+{
+ TALLOC_CTX *frame = talloc_stackframe();
+ struct event_context *ev;
+ struct tevent_req *req;
+ NTSTATUS status = NT_STATUS_OK;
+
+ ev = event_context_init(frame);
+ if (ev == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto fail;
+ }
+
+ req = wb_ndr_dispatch_send(frame, ev, cli, table, opnum, r);
+ if (req == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto fail;
+ }
+
+ if (!tevent_req_poll(req, ev)) {
+ status = map_nt_error_from_unix(errno);
+ goto fail;
+ }
+
+ status = wb_ndr_dispatch_recv(req, mem_ctx);
+ fail:
+ TALLOC_FREE(frame);
+ return status;
+}
+
+struct rpc_pipe_client *wbint_rpccli_create(TALLOC_CTX *mem_ctx,
+ struct winbindd_child *child)
+{
+ struct rpc_pipe_client *result;
+ struct wb_ndr_transport_priv *transp;
+
+ result = talloc(mem_ctx, struct rpc_pipe_client);
+ if (result == NULL) {
+ return NULL;
+ }
+ result->abstract_syntax = ndr_table_wbint.syntax_id;
+ result->transfer_syntax = ndr_transfer_syntax;
+ result->dispatch = wb_ndr_dispatch;
+ result->dispatch_send = wb_ndr_dispatch_send;
+ result->dispatch_recv = wb_ndr_dispatch_recv;
+ result->max_xmit_frag = RPC_MAX_PDU_FRAG_LEN;
+ result->max_recv_frag = RPC_MAX_PDU_FRAG_LEN;
+ result->desthost = NULL;
+ result->srv_name_slash = NULL;
+
+ /*
+ * Initialize a fake transport. Due to our own wb_ndr_dispatch
+ * function we don't use all the fragmentation engine in
+ * cli_pipe, which would use all the _read and _write
+ * functions in rpc_cli_transport. But we need a place to
+ * store the child struct in, and we're re-using
+ * result->transport->priv for that.
+ */
+
+ result->transport = talloc_zero(result, struct rpc_cli_transport);
+ if (result->transport == NULL) {
+ TALLOC_FREE(result);
+ return NULL;
+ }
+ transp = talloc(result->transport, struct wb_ndr_transport_priv);
+ if (transp == NULL) {
+ TALLOC_FREE(result);
+ return NULL;
+ }
+ transp->child = child;
+ result->transport->priv = transp;
+ return result;
+}
+
+enum winbindd_result winbindd_dual_ndrcmd(struct winbindd_domain *domain,
+ struct winbindd_cli_state *state)
+{
+ pipes_struct p;
+ struct api_struct *fns;
+ int num_fns;
+ bool ret;
+
+ wbint_get_pipe_fns(&fns, &num_fns);
+
+ if (state->request->data.ndrcmd >= num_fns) {
+ return WINBINDD_ERROR;
+ }
+
+ ZERO_STRUCT(p);
+ p.mem_ctx = talloc_stackframe();
+ p.in_data.data.buffer_size = state->request->extra_len;
+ p.in_data.data.data_p = state->request->extra_data.data;
+ prs_init(&p.out_data.rdata, 0, state->mem_ctx, false);
+
+ ret = fns[state->request->data.ndrcmd].fn(&p);
+ TALLOC_FREE(p.mem_ctx);
+ if (!ret) {
+ return WINBINDD_ERROR;
+ }
+
+ state->response->extra_data.data =
+ talloc_memdup(state->mem_ctx, p.out_data.rdata.data_p,
+ p.out_data.rdata.data_offset);
+ state->response->length += p.out_data.rdata.data_offset;
+ prs_mem_free(&p.out_data.rdata);
+ if (state->response->extra_data.data == NULL) {
+ return WINBINDD_ERROR;
+ }
+ return WINBINDD_OK;
+}
+
+/*
+ * Just a dummy to make srv_wbint.c happy
+ */
+NTSTATUS rpc_srv_register(int version, const char *clnt, const char *srv,
+ const struct ndr_interface_table *iface,
+ const struct api_struct *cmds, int size)
+{
+ return NT_STATUS_OK;
+}
git.samba.org / ira / wip.git / commitdiff