config: Move server transport config into the relay module

This commit:
* creates feature/relay/transport_config.[ch],
* moves server transport config checks into them,
* exposes some code from src/app/config.c
  (we'll refactor it later in 29211), and
* adds thin wrappers to make the moved code compile.

No functional changes: the moved code is still enabled,
even if the relay module is disabled. (Some of the checks
are re-ordered, so the order of some warnings may change.)

Part of 32213.

1 files changed, 27 insertions, 0 deletions

diff --git a/src/feature/relay/transport_config.h b/src/feature/relay/transport_config.h
new file mode 100644
index 0000000000..6ef1bc4020
--- /dev/null
+++ b/src/feature/relay/transport_config.h
@@ -0,0 +1,27 @@
+/* Copyright (c) 2001 Matej Pfajfar.
+ * Copyright (c) 2001-2004, Roger Dingledine.
+ * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
+ * Copyright (c) 2007-2019, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+/**
+ * @file transport_config.h
+ * @brief Header for feature/relay/transport_config.c
+ **/
+
+#ifndef TOR_FEATURE_RELAY_TRANSPORT_CONFIG_H
+#define TOR_FEATURE_RELAY_TRANSPORT_CONFIG_H
+
+typedef struct or_options_t or_options_t;
+typedef struct smartlist_t smartlist_t;
+
+char *get_transport_bindaddr_from_config(const char *transport);
+smartlist_t *get_options_from_transport_options_line(const char *line,
+                                                     const char *transport);
+smartlist_t *get_options_for_server_transport(const char *transport);
+
+int options_validate_server_transport(const or_options_t *old_options,
+                                      or_options_t *options,
+                                      char **msg);
+
+#endif /* !defined(TOR_FEATURE_RELAY_TRANSPORT_CONFIG_H) */