relay: Split out relay-only circuit building

Move the relay-only circuit building functions into a new file.

Part of 33633.

1 files changed, 60 insertions, 0 deletions

diff --git a/src/feature/relay/circuitbuild_relay.h b/src/feature/relay/circuitbuild_relay.h
new file mode 100644
index 0000000000..decc28d3a8
--- /dev/null
+++ b/src/feature/relay/circuitbuild_relay.h
@@ -0,0 +1,60 @@
+/* Copyright (c) 2001 Matej Pfajfar.
+ * Copyright (c) 2001-2004, Roger Dingledine.
+ * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
+ * Copyright (c) 2007-2020, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+/**
+ * @file circuitbuild_relay.h
+ * @brief Header for feature/relay/circuitbuild_relay.c
+ **/
+
+#ifndef TOR_FEATURE_RELAY_CIRCUITBUILD_RELAY_H
+#define TOR_FEATURE_RELAY_CIRCUITBUILD_RELAY_H
+
+#include "lib/cc/torint.h"
+
+struct cell_t;
+struct created_cell_t;
+
+struct circuit_t;
+struct or_circuit_t;
+
+#ifdef HAVE_MODULE_RELAY
+
+int circuit_extend(struct cell_t *cell, struct circuit_t *circ);
+
+int onionskin_answer(struct or_circuit_t *circ,
+                     const struct created_cell_t *created_cell,
+                     const char *keys, size_t keys_len,
+                     const uint8_t *rend_circ_nonce);
+
+#else
+
+static inline int
+circuit_extend(struct cell_t *cell, struct circuit_t *circ)
+{
+  (void)cell;
+  (void)circ;
+  tor_assert_nonfatal_unreached();
+  return -1;
+}
+
+static inline int
+onionskin_answer(struct or_circuit_t *circ,
+                 const struct created_cell_t *created_cell,
+                 const char *keys, size_t keys_len,
+                 const uint8_t *rend_circ_nonce)
+{
+  (void)circ;
+  (void)created_cell;
+  (void)keys;
+  (void)keys_len;
+  (void)rend_circ_nonce;
+  tor_assert_nonfatal_unreached();
+  return -1;
+}
+
+#endif
+
+#endif /* !defined(TOR_FEATURE_RELAY_CIRCUITBUILD_RELAY_H) */