s3-rpc_server: Move the endpoint registration to own file.

1 files changed, 286 insertions, 0 deletions

diff --git a/source3/rpc_server/rpc_ep_register.c b/source3/rpc_server/rpc_ep_register.c
new file mode 100644
index 0000000000..906dd6c59e
--- /dev/null
+++ b/source3/rpc_server/rpc_ep_register.c
@@ -0,0 +1,286 @@
+/*
+ *  Unix SMB/CIFS implementation.
+ *
+ *  RPC Endpoint Registration
+ *
+ *  Copyright (c) 2011      Andreas Schneider <asn@samba.org>
+ *
+ *  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 "ntdomain.h"
+
+#include "../librpc/gen_ndr/ndr_epmapper_c.h"
+
+#include "librpc/rpc/dcerpc_ep.h"
+#include "rpc_server/rpc_ep_register.h"
+
+static void rpc_ep_register_loop(struct tevent_req *subreq);
+static NTSTATUS rpc_ep_try_register(TALLOC_CTX *mem_ctx,
+				    struct tevent_context *ev_ctx,
+				    struct messaging_context *msg_ctx,
+				    const struct ndr_interface_table *iface,
+				    const char *ncalrpc,
+				    uint16_t port,
+				    struct dcerpc_binding_handle **pbh);
+
+struct rpc_ep_regsiter_state {
+	struct dcerpc_binding_handle *h;
+
+	TALLOC_CTX *mem_ctx;
+	struct tevent_context *ev_ctx;
+	struct messaging_context *msg_ctx;
+
+	const struct ndr_interface_table *iface;
+
+	const char *ncalrpc;
+	uint16_t port;
+
+	uint32_t wait_time;
+};
+
+NTSTATUS rpc_ep_register(struct tevent_context *ev_ctx,
+			 struct messaging_context *msg_ctx,
+			 const struct ndr_interface_table *iface,
+			 const char *ncalrpc,
+			 uint16_t port)
+{
+	struct rpc_ep_regsiter_state *state;
+	struct tevent_req *req;
+
+	state = talloc(ev_ctx, struct rpc_ep_regsiter_state);
+	if (state == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	state->mem_ctx = talloc_named(state,
+				      0,
+				      "ep %s %p",
+				      iface->name, state);
+	if (state->mem_ctx == NULL) {
+		talloc_free(state);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	state->wait_time = 1;
+	state->ev_ctx = ev_ctx;
+	state->msg_ctx = msg_ctx;
+	state->iface = iface;
+	state->ncalrpc = talloc_strdup(state, ncalrpc);
+	state->port = port;
+
+	req = tevent_wakeup_send(state->mem_ctx,
+				 state->ev_ctx,
+				 timeval_current_ofs(1, 0));
+	if (tevent_req_nomem(state->mem_ctx, req)) {
+		talloc_free(state);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	tevent_req_set_callback(req, rpc_ep_register_loop, state);
+
+	return NT_STATUS_OK;
+}
+
+#define MONITOR_WAIT_TIME 15
+static void rpc_ep_monitor_loop(struct tevent_req *subreq);
+
+static void rpc_ep_register_loop(struct tevent_req *subreq)
+{
+	struct rpc_ep_regsiter_state *state =
+		tevent_req_callback_data(subreq, struct rpc_ep_regsiter_state);
+	NTSTATUS status;
+	bool ok;
+
+	ok = tevent_wakeup_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (!ok) {
+		talloc_free(state);
+		return;
+	}
+
+	status = rpc_ep_try_register(state->mem_ctx,
+				     state->ev_ctx,
+				     state->msg_ctx,
+				     state->iface,
+				     state->ncalrpc,
+				     state->port,
+				     &state->h);
+	if (NT_STATUS_IS_OK(status)) {
+		/* endpoint registered, monitor the connnection. */
+		subreq = tevent_wakeup_send(state->mem_ctx,
+					    state->ev_ctx,
+					    timeval_current_ofs(MONITOR_WAIT_TIME, 0));
+		if (tevent_req_nomem(state->mem_ctx, subreq)) {
+			talloc_free(state);
+			return;
+		}
+
+		tevent_req_set_callback(subreq, rpc_ep_monitor_loop, state);
+		return;
+	}
+
+	state->wait_time = state->wait_time * 2;
+	if (state->wait_time > 16) {
+		DEBUG(0, ("Failed to register endpoint '%s'!\n",
+			   state->iface->name));
+		state->wait_time = 16;
+	}
+
+	subreq = tevent_wakeup_send(state->mem_ctx,
+				    state->ev_ctx,
+				    timeval_current_ofs(state->wait_time, 0));
+	if (tevent_req_nomem(state->mem_ctx, subreq)) {
+		talloc_free(state);
+		return;
+	}
+
+	tevent_req_set_callback(subreq, rpc_ep_register_loop, state);
+	return;
+}
+
+static NTSTATUS rpc_ep_try_register(TALLOC_CTX *mem_ctx,
+				    struct tevent_context *ev_ctx,
+				    struct messaging_context *msg_ctx,
+				    const struct ndr_interface_table *iface,
+				    const char *ncalrpc,
+				    uint16_t port,
+				    struct dcerpc_binding_handle **pbh)
+{
+	struct dcerpc_binding_vector *v = NULL;
+	NTSTATUS status;
+
+	status = dcerpc_binding_vector_create(mem_ctx,
+					      iface,
+					      port,
+					      ncalrpc,
+					      &v);
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+
+	status = dcerpc_ep_register(mem_ctx,
+				    msg_ctx,
+				    iface,
+				    v,
+				    &iface->syntax_id.uuid,
+				    iface->name,
+				    pbh);
+	talloc_free(v);
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+
+	return status;
+}
+
+/*
+ * Monitor the connection to the endpoint mapper and if it goes away, try to
+ * register the endpoint.
+ */
+static void rpc_ep_monitor_loop(struct tevent_req *subreq)
+{
+	struct rpc_ep_regsiter_state *state =
+		tevent_req_callback_data(subreq, struct rpc_ep_regsiter_state);
+	struct policy_handle entry_handle;
+	struct dcerpc_binding map_binding;
+	struct epm_twr_p_t towers[10];
+	struct epm_twr_t *map_tower;
+	uint32_t num_towers = 0;
+	struct GUID object;
+	NTSTATUS status;
+	uint32_t result = EPMAPPER_STATUS_CANT_PERFORM_OP;
+	TALLOC_CTX *tmp_ctx;
+	bool ok;
+
+	ZERO_STRUCT(object);
+	ZERO_STRUCT(entry_handle);
+
+	tmp_ctx = talloc_stackframe();
+	if (tmp_ctx == NULL) {
+		talloc_free(state);
+		return;
+	}
+
+	ok = tevent_wakeup_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (!ok) {
+		talloc_free(state);
+		return;
+	}
+
+	/* Create map tower */
+	map_binding.transport = NCACN_NP;
+	map_binding.object = state->iface->syntax_id;
+	map_binding.host = "";
+	map_binding.endpoint = "";
+
+	map_tower = talloc_zero(tmp_ctx, struct epm_twr_t);
+	if (map_tower == NULL) {
+		talloc_free(tmp_ctx);
+		talloc_free(state);
+		return;
+	}
+
+	status = dcerpc_binding_build_tower(map_tower, &map_binding,
+					    &map_tower->tower);
+	if (!NT_STATUS_IS_OK(status)) {
+		talloc_free(tmp_ctx);
+		talloc_free(state);
+		return;
+	}
+
+	ok = false;
+	status = dcerpc_epm_Map(state->h,
+				tmp_ctx,
+				&object,
+				map_tower,
+				&entry_handle,
+				10,
+				&num_towers,
+				towers,
+				&result);
+	if (NT_STATUS_IS_OK(status)) {
+		ok = true;
+	}
+	if (result == EPMAPPER_STATUS_OK ||
+	    result == EPMAPPER_STATUS_NO_MORE_ENTRIES) {
+		ok = true;
+	}
+	if (num_towers == 0) {
+		ok = false;
+	}
+
+	talloc_free(tmp_ctx);
+
+	subreq = tevent_wakeup_send(state->mem_ctx,
+				    state->ev_ctx,
+				    timeval_current_ofs(MONITOR_WAIT_TIME, 0));
+	if (tevent_req_nomem(state->mem_ctx, subreq)) {
+		talloc_free(state);
+		return;
+	}
+
+	if (ok) {
+		tevent_req_set_callback(subreq, rpc_ep_monitor_loop, state);
+	} else {
+		TALLOC_FREE(state->h);
+		state->wait_time = 1;
+
+		tevent_req_set_callback(subreq, rpc_ep_register_loop, state);
+	}
+
+	return;
+}