From 73faa82bf9ebebdff9662e60715e9fd4f1614b9f Mon Sep 17 00:00:00 2001
From: Andreas Schneider <asn@samba.org>
Date: Thu, 10 Mar 2011 10:17:51 +0100
Subject: s3-rpc_server: Implement an endpoint monitor loop.

---
 source3/librpc/rpc/dcerpc_ep.c    |   2 +-
 source3/rpc_server/rpc_ep_setup.c | 114 +++++++++++++++++++++++++++++++++++++-
 2 files changed, 114 insertions(+), 2 deletions(-)

(limited to 'source3')

diff --git a/source3/librpc/rpc/dcerpc_ep.c b/source3/librpc/rpc/dcerpc_ep.c
index 92c01a32bb..1fce63acd2 100644
--- a/source3/librpc/rpc/dcerpc_ep.c
+++ b/source3/librpc/rpc/dcerpc_ep.c
@@ -289,7 +289,7 @@ static NTSTATUS ep_register(TALLOC_CTX *mem_ctx,
 
 	if (pbh != NULL) {
 		*pbh = talloc_move(mem_ctx, &h);
-		talloc_steal(mem_ctx, cli);
+		talloc_steal(*pbh, cli);
 	}
 
 done:
diff --git a/source3/rpc_server/rpc_ep_setup.c b/source3/rpc_server/rpc_ep_setup.c
index ddc655cb67..836ef30242 100644
--- a/source3/rpc_server/rpc_ep_setup.c
+++ b/source3/rpc_server/rpc_ep_setup.c
@@ -21,6 +21,7 @@
 
 #include "includes.h"
 
+#include "../librpc/gen_ndr/ndr_epmapper_c.h"
 #include "../librpc/gen_ndr/srv_epmapper.h"
 #include "../librpc/gen_ndr/srv_srvsvc.h"
 #include "../librpc/gen_ndr/srv_winreg.h"
@@ -215,6 +216,9 @@ static NTSTATUS rpc_ep_setup_register(struct tevent_context *ev_ctx,
 	return NT_STATUS_OK;
 }
 
+#define MONITOR_WAIT_TIME 15
+static void rpc_ep_setup_monitor_loop(struct tevent_req *subreq);
+
 static void rpc_ep_setup_register_loop(struct tevent_req *req)
 {
 	struct rpc_ep_regsiter_state *state =
@@ -237,7 +241,16 @@ static void rpc_ep_setup_register_loop(struct tevent_req *req)
 					   state->port,
 					   &state->h);
 	if (NT_STATUS_IS_OK(status)) {
-		talloc_free(state);
+		/* endpoint registered, monitor the connnection. */
+		req = tevent_wakeup_send(state->mem_ctx,
+					 state->ev_ctx,
+					 timeval_current_ofs(MONITOR_WAIT_TIME, 0));
+		if (tevent_req_nomem(state->mem_ctx, req)) {
+			talloc_free(state);
+			return;
+		}
+
+		tevent_req_set_callback(req, rpc_ep_setup_monitor_loop, state);
 		return;
 	}
 
@@ -293,6 +306,105 @@ static NTSTATUS rpc_ep_setup_try_register(TALLOC_CTX *mem_ctx,
 	return status;
 }
 
+/*
+ * Monitor the connection to the endpoint mapper and if it goes away, try to
+ * register the endpoint.
+ */
+static void rpc_ep_setup_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_setup_monitor_loop, state);
+	} else {
+		TALLOC_FREE(state->h);
+		state->wait_time = 1;
+
+		tevent_req_set_callback(subreq, rpc_ep_setup_register_loop, state);
+	}
+
+	return;
+}
+
 static bool epmapper_init_cb(void *ptr)
 {
 	struct dcesrv_ep_context *ep_ctx =
-- 
cgit