3 files changed, 66 insertions, 32 deletions

diff --git a/source4/libcli/ndr/libndr.h b/source4/libcli/ndr/libndr.h
index d9d18299ab..0205a64552 100644
--- a/source4/libcli/ndr/libndr.h
+++ b/source4/libcli/ndr/libndr.h
@@ -84,6 +84,10 @@ struct ndr_push {
 				} \
                            } while (0)
 
+/* these are used when generic fn pointers are needed for ndr push/pull fns */
+typedef NTSTATUS (*ndr_push_fn_t)(struct ndr_push *, void *);
+typedef NTSTATUS (*ndr_pull_fn_t)(struct ndr_pull *, void *);
+
 /* now pull in the individual parsers */
 #include "libcli/ndr/ndr_sec.h"
 #include "libcli/ndr/ndr_echo.h"
diff --git a/source4/libcli/rpc/dcerpc.c b/source4/libcli/rpc/dcerpc.c
index 3f95bd914c..7980b77757 100644
--- a/source4/libcli/rpc/dcerpc.c
+++ b/source4/libcli/rpc/dcerpc.c
@@ -656,3 +656,58 @@ NTSTATUS cli_dcerpc_request(struct dcerpc_pipe *p,
 
 	return status;
 }
+
+
+/*
+  a useful helper function for synchronous rpc requests
+*/
+NTSTATUS dcerpc_ndr_request(struct dcerpc_pipe *p,
+			    uint32 opnum,
+			    TALLOC_CTX *mem_ctx,
+			    NTSTATUS (*ndr_push)(struct ndr_push *, void *),
+			    NTSTATUS (*ndr_pull)(struct ndr_pull *, void *),
+			    void *struct_ptr)
+{
+	struct ndr_push *push;
+	struct ndr_pull *pull;
+	NTSTATUS status;
+	DATA_BLOB request, response;
+
+	/* setup for a ndr_push_* call */
+	push = ndr_push_init();
+	if (!push) {
+		talloc_destroy(mem_ctx);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	/* push the structure into a blob */
+	status = ndr_push_rpcecho_addone(push, struct_ptr);
+	if (!NT_STATUS_IS_OK(status)) {
+		goto failed;
+	}
+
+	/* retrieve the blob */
+	request = ndr_push_blob(push);
+
+	/* make the actual dcerpc request */
+	status = cli_dcerpc_request(p, RPCECHO_CALL_ADDONE, mem_ctx, &request, &response);
+	if (!NT_STATUS_IS_OK(status)) {
+		goto failed;
+	}
+
+	/* prepare for ndr_pull_* */
+	pull = ndr_pull_init_blob(&response, mem_ctx);
+	if (!pull) {
+		goto failed;
+	}
+
+	/* pull the structure from the blob */
+	status = ndr_pull_rpcecho_addone(pull, struct_ptr);
+	if (!NT_STATUS_IS_OK(status)) {
+		goto failed;
+	}
+
+failed:
+	ndr_push_free(push);
+	return status;
+}
diff --git a/source4/libcli/rpc/rpc_echo.c b/source4/libcli/rpc/rpc_echo.c
index d2b2227823..c3075ecedc 100644
--- a/source4/libcli/rpc/rpc_echo.c
+++ b/source4/libcli/rpc/rpc_echo.c
@@ -30,50 +30,25 @@ NTSTATUS dcerpc_rpcecho_addone(struct dcerpc_pipe *p,
 {
 	struct rpcecho_addone r;
 	NTSTATUS status;
-	DATA_BLOB request, response;
 	TALLOC_CTX *mem_ctx;
-	struct ndr_push *push;
-	struct ndr_pull *pull;
 
 	mem_ctx = talloc_init("dcerpc_rpcecho_addone");
 	if (!mem_ctx) {
 		return NT_STATUS_NO_MEMORY;
 	}
 
-	push = ndr_push_init();
-	if (!push) {
-		talloc_destroy(mem_ctx);
-		return NT_STATUS_NO_MEMORY;
-	}
-
+	/* fill the .in side of the call */
 	r.in.data = in_data;
 
-	status = ndr_push_rpcecho_addone(push, &r);
-	if (!NT_STATUS_IS_OK(status)) {
-		goto failed;
-	}
-
-	request = ndr_push_blob(push);
-
-	status = cli_dcerpc_request(p, RPCECHO_CALL_ADDONE, mem_ctx, &request, &response);
-	if (!NT_STATUS_IS_OK(status)) {
-		goto failed;
-	}
-
-	pull = ndr_pull_init_blob(&response, mem_ctx);
-	if (!pull) {
-		goto failed;
-	}
-
-	status = ndr_pull_rpcecho_addone(pull, &r);
-	if (!NT_STATUS_IS_OK(status)) {
-		goto failed;
-	}
+	/* make the call */
+	status = dcerpc_ndr_request(p, RPCECHO_CALL_ADDONE, mem_ctx,
+				    (ndr_push_fn_t) ndr_push_rpcecho_addone,
+				    (ndr_pull_fn_t) ndr_pull_rpcecho_addone,
+				    &r);
 
+	/* and extract the .out parameters */
 	*out_data = r.out.data;
 
-failed:
-	ndr_push_free(push);
 	talloc_destroy(mem_ctx);
 	return status;
 }