librpc/rpc: add DCERPC_AUTH_PAD_LENGTH(stub_length) helper macro

This calculates the required padding DCERPC_AUTH_PAD_ALIGNMENT
and the stub_length.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=11061

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

diff --git a/librpc/rpc/rpc_common.h b/librpc/rpc/rpc_common.h
index 1b54b807a935d38a2e4777114eb0dfc8cab9965f..61a8eab71d15b84e7c16fc2ca96921f74558930e 100644 (file)
--- a/librpc/rpc/rpc_common.h
+++ b/librpc/rpc/rpc_common.h
@@ -372,4 +372,9 @@ bool dcerpc_sec_verification_trailer_check(
                const struct dcerpc_sec_vt_pcontext *pcontext,
                const struct dcerpc_sec_vt_header2 *header2);
 
+#define DCERPC_AUTH_PAD_LENGTH(stub_length) (\
+       (((stub_length) % DCERPC_AUTH_PAD_ALIGNMENT) > 0)?\
+       (DCERPC_AUTH_PAD_ALIGNMENT - (stub_length) % DCERPC_AUTH_PAD_ALIGNMENT):\
+       0)
+
 #endif /* __DEFAULT_LIBRPC_RPCCOMMON_H__ */