/* 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 reachability.h
 * \brief Header file for reachability.c.
 **/

#ifndef TOR_REACHABILITY_H
#define TOR_REACHABILITY_H

/** What fraction (1 over this number) of the relay ID space do we
 * (as a directory authority) launch connections to at each reachability
 * test? */
#define REACHABILITY_MODULO_PER_TEST 128

/** How often (in seconds) do we launch reachability tests? */
#define REACHABILITY_TEST_INTERVAL 10

/** How many seconds apart are the reachability tests for a given relay? */
#define REACHABILITY_TEST_CYCLE_PERIOD \
  (REACHABILITY_TEST_INTERVAL*REACHABILITY_MODULO_PER_TEST)

void dirserv_single_reachability_test(time_t now, routerinfo_t *router);
void dirserv_test_reachability(time_t now);

#ifdef HAVE_MODULE_DIRAUTH
int dirserv_should_launch_reachability_test(const routerinfo_t *ri,
                                            const routerinfo_t *ri_old);
void dirserv_orconn_tls_done(const tor_addr_t *addr,
                             uint16_t or_port,
                             const char *digest_rcvd,
                             const struct ed25519_public_key_t *ed_id_rcvd);
#else
static inline int
dirserv_should_launch_reachability_test(const routerinfo_t *ri,
                                            const routerinfo_t *ri_old)
{
  (void)ri;
  (void)ri_old;
  return 0;
}
static inline void
dirserv_orconn_tls_done(const tor_addr_t *addr,
                        uint16_t or_port,
                        const char *digest_rcvd,
                        const struct ed25519_public_key_t *ed_id_rcvd)
{
  (void)addr;
  (void)or_port;
  (void)digest_rcvd;
  (void)ed_id_rcvd;
}
#endif

#endif /* !defined(TOR_REACHABILITY_H) */
