Move voteflags.[ch] to become dirauth only.

For various reasons, this was a nontrivial movement.  There are
several places in the code where we do something like "update the
flags on this routerstatus or node if we're an authority", and at
least one where we pretended to be an authority when we weren't.

src/core/include.am

@@ -153,8 +153,8 @@ LIBTOR_APP_A_SOURCES = 				\
 # These should eventually move into module_dirauth_sources, but for now
 # the separation is only in the code location.
 LIBTOR_APP_A_SOURCES += 			\
-	src/feature/dirauth/bwauth.c		\
-	src/feature/dirauth/voteflags.c
+	src/feature/dirauth/bwauth.c
+
 
 if BUILD_NT_SERVICES
 LIBTOR_APP_A_SOURCES += src/app/main/ntmain.c
@@ -171,6 +171,7 @@ LIBTOR_APP_TESTING_A_SOURCES = $(LIBTOR_APP_A_SOURCES)
 # The Directory Authority module.
 MODULE_DIRAUTH_SOURCES = 					\
 	src/feature/dirauth/authmode.c				\
+        src/feature/dirauth/bridgeauth.c                        \
 	src/feature/dirauth/dirauth_periodic.c			\
 	src/feature/dirauth/dirauth_sys.c			\
 	src/feature/dirauth/dircollate.c			\
@@ -181,7 +182,8 @@ MODULE_DIRAUTH_SOURCES = 					\
 	src/feature/dirauth/reachability.c			\
 	src/feature/dirauth/recommend_pkg.c			\
 	src/feature/dirauth/shared_random.c			\
-	src/feature/dirauth/shared_random_state.c
+	src/feature/dirauth/shared_random_state.c               \
+	src/feature/dirauth/voteflags.c
 
 if BUILD_MODULE_DIRAUTH
 LIBTOR_APP_A_SOURCES += $(MODULE_DIRAUTH_SOURCES)
@@ -310,6 +312,7 @@ noinst_HEADERS +=					\
 	src/feature/control/fmt_serverstatus.h		\
 	src/feature/control/getinfo_geoip.h		\
 	src/feature/dirauth/authmode.h			\
+        src/feature/dirauth/bridgeauth.h                \
 	src/feature/dirauth/bwauth.h			\
 	src/feature/dirauth/dirauth_periodic.h		\
 	src/feature/dirauth/dirauth_sys.h		\

src/core/mainloop/mainloop.c

@@ -75,6 +75,7 @@
 #include "feature/control/control.h"
 #include "feature/control/control_events.h"
 #include "feature/dirauth/authmode.h"
+#include "feature/dirauth/bridgeauth.h"
 #include "feature/dircache/consdiffmgr.h"
 #include "feature/dircache/dirserv.h"
 #include "feature/dircommon/directory.h"
@@ -1366,7 +1367,6 @@ CALLBACK(retry_listeners);
 CALLBACK(rotate_onion_key);
 CALLBACK(rotate_x509_certificate);
 CALLBACK(save_state);
-CALLBACK(write_bridge_ns);
 CALLBACK(write_stats_file);
 CALLBACK(control_per_second_events);
 CALLBACK(second_elapsed);
@@ -1433,9 +1433,6 @@ STATIC periodic_event_item_t mainloop_periodic_events[] = {
   /* XXXX this could be restricted to CLIENT+NET_PARTICIPANT */
   CALLBACK(rend_cache_failure_clean, NET_PARTICIPANT, FL(RUN_ON_DISABLE)),
 
-  /* Bridge Authority only. */
-  CALLBACK(write_bridge_ns, BRIDGEAUTH, 0),
-
   /* Directory server only. */
   CALLBACK(clean_consdiffmgr, DIRSERVER, 0),
 
@@ -2369,22 +2366,6 @@ check_dns_honesty_callback(time_t now, const or_options_t *options)
   return 12*3600 + crypto_rand_int(12*3600);
 }
 
-/**
- * Periodic callback: if we're the bridge authority, write a networkstatus
- * file to disk.
- */
-static int
-write_bridge_ns_callback(time_t now, const or_options_t *options)
-{
-  /* 10. write bridge networkstatus file to disk */
-  if (options->BridgeAuthoritativeDir) {
-    networkstatus_dump_bridge_status_to_file(now);
-#define BRIDGE_STATUSFILE_INTERVAL (30*60)
-     return BRIDGE_STATUSFILE_INTERVAL;
-  }
-  return PERIODIC_EVENT_NO_UPDATE;
-}
-
 static int heartbeat_callback_first_time = 1;
 
 /**

src/feature/control/fmt_serverstatus.c

@@ -76,7 +76,6 @@ list_server_status_v1(smartlist_t *routers, char **router_status_out,
   SMARTLIST_FOREACH_BEGIN(routers, routerinfo_t *, ri) {
     const node_t *node = node_get_by_id(ri->cache_info.identity_digest);
     tor_assert(node);
-
     if (for_controller) {
       char name_buf[MAX_VERBOSE_NICKNAME_LEN+2];
       char *cp = name_buf;

src/feature/dirauth/bridgeauth.c

@@ -0,0 +1,55 @@
+/* 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 */
+
+#include "core/or/or.h"
+#include "feature/dirauth/bridgeauth.h"
+#include "feature/dirauth/voteflags.h"
+#include "feature/nodelist/networkstatus.h"
+#include "feature/relay/router.h"
+#include "app/config/config.h"
+
+#include "feature/nodelist/routerinfo_st.h"
+
+/** Write out router status entries for all our bridge descriptors. Here, we
+ * also mark routers as running. */
+void
+bridgeauth_dump_bridge_status_to_file(time_t now)
+{
+  char *status;
+  char *fname = NULL;
+  char *thresholds = NULL;
+  char *published_thresholds_and_status = NULL;
+  char published[ISO_TIME_LEN+1];
+  const routerinfo_t *me = router_get_my_routerinfo();
+  char fingerprint[FINGERPRINT_LEN+1];
+  char *fingerprint_line = NULL;
+
+  dirserv_set_bridges_running(now);
+  status = networkstatus_getinfo_by_purpose("bridge", now);
+
+  if (me && crypto_pk_get_fingerprint(me->identity_pkey,
+                                      fingerprint, 0) >= 0) {
+    tor_asprintf(&fingerprint_line, "fingerprint %s\n", fingerprint);
+  } else {
+    log_warn(LD_BUG, "Error computing fingerprint for bridge status.");
+  }
+  format_iso_time(published, now);
+  dirserv_compute_bridge_flag_thresholds();
+  thresholds = dirserv_get_flag_thresholds_line();
+  tor_asprintf(&published_thresholds_and_status,
+               "published %s\nflag-thresholds %s\n%s%s",
+               published, thresholds, fingerprint_line ? fingerprint_line : "",
+               status);
+  fname = get_datadir_fname("networkstatus-bridges");
+  if (write_str_to_file(fname,published_thresholds_and_status,0)<0) {
+    log_warn(LD_DIRSERV, "Unable to write networkstatus-bridges file.");
+  }
+  tor_free(thresholds);
+  tor_free(published_thresholds_and_status);
+  tor_free(fname);
+  tor_free(status);
+  tor_free(fingerprint_line);
+}

src/feature/dirauth/bridgeauth.h

@@ -0,0 +1,12 @@
+/* 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 */
+
+#ifndef TOR_DIRAUTH_BRIDGEAUTH_H
+#define TOR_DIRAUTH_BRIDGEAUTH_H
+
+void bridgeauth_dump_bridge_status_to_file(time_t now);
+
+#endif

src/feature/dirauth/dirauth_periodic.c

@@ -11,6 +11,7 @@
 #include "feature/dirauth/reachability.h"
 #include "feature/stats/rephist.h"
 
+#include "feature/dirauth/bridgeauth.h"
 #include "feature/dirauth/dirvote.h"
 #include "feature/dirauth/dirauth_periodic.h"
 #include "feature/dirauth/authmode.h"
@@ -131,6 +132,23 @@ downrate_stability_callback(time_t now, const or_options_t *options)
 
 DECLARE_EVENT(downrate_stability, AUTHORITIES, 0);
 
+/**
+ * Periodic callback: if we're the bridge authority, write a networkstatus
+ * file to disk.
+ */
+static int
+write_bridge_ns_callback(time_t now, const or_options_t *options)
+{
+  if (options->BridgeAuthoritativeDir) {
+    bridgeauth_dump_bridge_status_to_file(now);
+#define BRIDGE_STATUSFILE_INTERVAL (30*60)
+     return BRIDGE_STATUSFILE_INTERVAL;
+  }
+  return PERIODIC_EVENT_NO_UPDATE;
+}
+
+DECLARE_EVENT(write_bridge_ns, BRIDGEAUTH, 0);
+
 void
 dirauth_register_periodic_events(void)
 {
@@ -139,4 +157,5 @@ dirauth_register_periodic_events(void)
   periodic_events_register(&save_stability_event);
   periodic_events_register(&check_authority_cert_event);
   periodic_events_register(&dirvote_event);
+  periodic_events_register(&write_bridge_ns_event);
 }

src/feature/dirauth/dirvote.c

@@ -4545,7 +4545,7 @@ dirserv_generate_networkstatus_vote_obj(crypto_pk_t *private_key,
 
       vrs = tor_malloc_zero(sizeof(vote_routerstatus_t));
       rs = &vrs->status;
-      set_routerstatus_from_routerinfo(rs, node, ri, now,
+      dirauth_set_routerstatus_from_routerinfo(rs, node, ri, now,
                                                listbadexits);
 
       if (ri->cache_info.signing_key_cert) {

src/feature/dirauth/voteflags.c

@@ -546,15 +546,14 @@ should_publish_node_ipv6(const node_t *node, const routerinfo_t *ri,
      router_is_me(ri));
 }
 
-/** Extract status information from <b>ri</b> and from other authority
- * functions and store it in <b>rs</b>. <b>rs</b> is zeroed out before it is
- * set.
- *
- * We assume that ri-\>is_running has already been set, e.g. by
- *   dirserv_set_router_is_running(ri, now);
+/**
+ * Extract status information from <b>ri</b> and from other authority
+ * functions and store it in <b>rs</b>, as per
+ * <b>set_routerstatus_from_routerinfo</b>.  Additionally, sets information
+ * in from the authority subsystem.
  */
 void
-set_routerstatus_from_routerinfo(routerstatus_t *rs,
+dirauth_set_routerstatus_from_routerinfo(routerstatus_t *rs,
                                          node_t *node,
                                          const routerinfo_t *ri,
                                          time_t now,
@@ -563,21 +562,15 @@ set_routerstatus_from_routerinfo(routerstatus_t *rs,
   const or_options_t *options = get_options();
   uint32_t routerbw_kb = dirserv_get_credible_bandwidth_kb(ri);
 
-  memset(rs, 0, sizeof(routerstatus_t));
+  /* Set these flags so that set_routerstatus_from_routerinfo can copy them.
+   */
+  node->is_stable = !dirserv_thinks_router_is_unreliable(now, ri, 1, 0);
+  node->is_fast = !dirserv_thinks_router_is_unreliable(now, ri, 0, 1);
+  node->is_hs_dir = dirserv_thinks_router_is_hs_dir(ri, node, now);
 
-  rs->is_authority =
-    router_digest_is_trusted_dir(ri->cache_info.identity_digest);
-
-  /* Already set by compute_performance_thresholds. */
-  rs->is_exit = node->is_exit;
-  rs->is_stable = node->is_stable =
-    !dirserv_thinks_router_is_unreliable(now, ri, 1, 0);
-  rs->is_fast = node->is_fast =
-    !dirserv_thinks_router_is_unreliable(now, ri, 0, 1);
-  rs->is_flagged_running = node->is_running; /* computed above */
-
-  rs->is_valid = node->is_valid;
+  set_routerstatus_from_routerinfo(rs, node, ri);
 
+  /* Override rs->is_possible_guard. */
   if (node->is_fast && node->is_stable &&
       ri->supports_tunnelled_dir_requests &&
       ((options->AuthDirGuardBWGuarantee &&
@@ -593,31 +586,16 @@ set_routerstatus_from_routerinfo(routerstatus_t *rs,
     rs->is_possible_guard = 0;
   }
 
+  /* Override rs->is_bad_exit */
   rs->is_bad_exit = listbadexits && node->is_bad_exit;
-  rs->is_hs_dir = node->is_hs_dir =
-    dirserv_thinks_router_is_hs_dir(ri, node, now);
-
-  rs->is_named = rs->is_unnamed = 0;
-
-  rs->published_on = ri->cache_info.published_on;
-  memcpy(rs->identity_digest, node->identity, DIGEST_LEN);
-  memcpy(rs->descriptor_digest, ri->cache_info.signed_descriptor_digest,
-         DIGEST_LEN);
-  rs->addr = ri->addr;
-  strlcpy(rs->nickname, ri->nickname, sizeof(rs->nickname));
-  rs->or_port = ri->or_port;
-  rs->dir_port = ri->dir_port;
-  rs->is_v2_dir = ri->supports_tunnelled_dir_requests;
 
+  /* Set rs->is_staledesc. */
   rs->is_staledesc =
     (ri->cache_info.published_on + DESC_IS_STALE_INTERVAL) < now;
 
-  if (should_publish_node_ipv6(node, ri, now)) {
-    /* We're configured as having IPv6 connectivity. There's an IPv6
-       OR port and it's reachable so copy it to the routerstatus.  */
-    tor_addr_copy(&rs->ipv6_addr, &ri->ipv6_addr);
-    rs->ipv6_orport = ri->ipv6_orport;
-  } else {
+  if (! should_publish_node_ipv6(node, ri, now)) {
+    /* We're not configured as having IPv6 connectivity or the node isn't:
+     * zero its IPv6 information. */
     tor_addr_make_null(&rs->ipv6_addr, AF_INET6);
     rs->ipv6_orport = 0;
   }

src/feature/dirauth/voteflags.h

@@ -12,18 +12,20 @@
 #ifndef TOR_VOTEFLAGS_H
 #define TOR_VOTEFLAGS_H
 
+#ifdef HAVE_MODULE_DIRAUTH
 void dirserv_set_router_is_running(routerinfo_t *router, time_t now);
 char *dirserv_get_flag_thresholds_line(void);
 void dirserv_compute_bridge_flag_thresholds(void);
 int running_long_enough_to_decide_unreachable(void);
 
-void set_routerstatus_from_routerinfo(routerstatus_t *rs,
+void dirauth_set_routerstatus_from_routerinfo(routerstatus_t *rs,
                                               node_t *node,
                                               const routerinfo_t *ri,
                                               time_t now,
                                               int listbadexits);
 
 void dirserv_compute_performance_thresholds(digestmap_t *omit_as_sybil);
+#endif
 
 void dirserv_set_bridges_running(time_t now);
 

src/feature/nodelist/networkstatus.c

@@ -2366,6 +2366,49 @@ networkstatus_getinfo_helper_single(const routerstatus_t *rs)
                                    NULL);
 }
 
+/**
+ * Extract status information from <b>ri</b> and from other authority
+ * functions and store it in <b>rs</b>. <b>rs</b> is zeroed out before it is
+ * set.
+ *
+ * We assume that node-\>is_running has already been set, e.g. by
+ *   dirserv_set_router_is_running(ri, now);
+ */
+void
+set_routerstatus_from_routerinfo(routerstatus_t *rs,
+                                 const node_t *node,
+                                 const routerinfo_t *ri)
+{
+  memset(rs, 0, sizeof(routerstatus_t));
+
+  rs->is_authority =
+    router_digest_is_trusted_dir(ri->cache_info.identity_digest);
+
+  /* Set by compute_performance_thresholds or from consensus */
+  rs->is_exit = node->is_exit;
+  rs->is_stable = node->is_stable;
+  rs->is_fast = node->is_fast;
+  rs->is_flagged_running = node->is_running;
+  rs->is_valid = node->is_valid;
+  rs->is_possible_guard = node->is_possible_guard;
+  rs->is_bad_exit = node->is_bad_exit;
+  rs->is_hs_dir = node->is_hs_dir;
+  rs->is_named = rs->is_unnamed = 0;
+
+  rs->published_on = ri->cache_info.published_on;
+  memcpy(rs->identity_digest, node->identity, DIGEST_LEN);
+  memcpy(rs->descriptor_digest, ri->cache_info.signed_descriptor_digest,
+         DIGEST_LEN);
+  rs->addr = ri->addr;
+  strlcpy(rs->nickname, ri->nickname, sizeof(rs->nickname));
+  rs->or_port = ri->or_port;
+  rs->dir_port = ri->dir_port;
+  rs->is_v2_dir = ri->supports_tunnelled_dir_requests;
+
+  tor_addr_copy(&rs->ipv6_addr, &ri->ipv6_addr);
+  rs->ipv6_orport = ri->ipv6_orport;
+}
+
 /** Alloc and return a string describing routerstatuses for the most
  * recent info of each router we know about that is of purpose
  * <b>purpose_string</b>. Return NULL if unrecognized purpose.
@@ -2398,8 +2441,7 @@ networkstatus_getinfo_by_purpose(const char *purpose_string, time_t now)
       continue;
     if (ri->purpose != purpose)
       continue;
-    /* then generate and write out status lines for each of them */
-    set_routerstatus_from_routerinfo(&rs, node, ri, now, 0);
+    set_routerstatus_from_routerinfo(&rs, node, ri);
     smartlist_add(statuses, networkstatus_getinfo_helper_single(&rs));
   } SMARTLIST_FOREACH_END(ri);
 
@@ -2409,47 +2451,6 @@ networkstatus_getinfo_by_purpose(const char *purpose_string, time_t now)
   return answer;
 }
 
-/** Write out router status entries for all our bridge descriptors. Here, we
- * also mark routers as running. */
-void
-networkstatus_dump_bridge_status_to_file(time_t now)
-{
-  char *status;
-  char *fname = NULL;
-  char *thresholds = NULL;
-  char *published_thresholds_and_status = NULL;
-  char published[ISO_TIME_LEN+1];
-  const routerinfo_t *me = router_get_my_routerinfo();
-  char fingerprint[FINGERPRINT_LEN+1];
-  char *fingerprint_line = NULL;
-
-  dirserv_set_bridges_running(now);
-  status = networkstatus_getinfo_by_purpose("bridge", now);
-
-  if (me && crypto_pk_get_fingerprint(me->identity_pkey,
-                                      fingerprint, 0) >= 0) {
-    tor_asprintf(&fingerprint_line, "fingerprint %s\n", fingerprint);
-  } else {
-    log_warn(LD_BUG, "Error computing fingerprint for bridge status.");
-  }
-  format_iso_time(published, now);
-  dirserv_compute_bridge_flag_thresholds();
-  thresholds = dirserv_get_flag_thresholds_line();
-  tor_asprintf(&published_thresholds_and_status,
-               "published %s\nflag-thresholds %s\n%s%s",
-               published, thresholds, fingerprint_line ? fingerprint_line : "",
-               status);
-  fname = get_datadir_fname("networkstatus-bridges");
-  if (write_str_to_file(fname,published_thresholds_and_status,0)<0) {
-    log_warn(LD_DIRSERV, "Unable to write networkstatus-bridges file.");
-  }
-  tor_free(thresholds);
-  tor_free(published_thresholds_and_status);
-  tor_free(fname);
-  tor_free(status);
-  tor_free(fingerprint_line);
-}
-
 /* DOCDOC get_net_param_from_list */
 static int32_t
 get_net_param_from_list(smartlist_t *net_params, const char *param_name,

src/feature/nodelist/networkstatus.h

@@ -122,7 +122,6 @@ void signed_descs_update_status_from_consensus_networkstatus(
 
 char *networkstatus_getinfo_helper_single(const routerstatus_t *rs);
 char *networkstatus_getinfo_by_purpose(const char *purpose_string, time_t now);
-void networkstatus_dump_bridge_status_to_file(time_t now);
 MOCK_DECL(int32_t, networkstatus_get_param,
           (const networkstatus_t *ns, const char *param_name,
            int32_t default_val, int32_t min_val, int32_t max_val));
@@ -149,6 +148,10 @@ void vote_routerstatus_free_(vote_routerstatus_t *rs);
 #define vote_routerstatus_free(rs) \
   FREE_AND_NULL(vote_routerstatus_t, vote_routerstatus_free_, (rs))
 
+void set_routerstatus_from_routerinfo(routerstatus_t *rs,
+                                      const node_t *node,
+                                      const routerinfo_t *ri);
+
 #ifdef NETWORKSTATUS_PRIVATE
 #ifdef TOR_UNIT_TESTS
 STATIC int networkstatus_set_current_consensus_from_ns(networkstatus_t *c,

src/test/test_voting_flags.c

@@ -60,7 +60,7 @@ check_result(flag_vote_test_cfg_t *c)
   bool result = false;
   routerstatus_t rs;
   memset(&rs, 0, sizeof(rs));
-  set_routerstatus_from_routerinfo(&rs, &c->node, &c->ri, c->now, 0);
+  dirauth_set_routerstatus_from_routerinfo(&rs, &c->node, &c->ri, c->now, 0);
 
   tt_i64_op(rs.published_on, OP_EQ, c->expected.published_on);
   tt_str_op(rs.nickname, OP_EQ, c->expected.nickname);