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[tor-commits] [tor/master] Merge branch 'tor-gitlab/mr/182' into master



commit 7c06707750f549fc22b74bdba7b9743d7b536e19
Merge: 6c61011781 0812ecd517
Author: David Goulet <dgoulet@xxxxxxxxxxxxxx>
Date:   Tue Nov 17 10:36:05 2020 -0500

    Merge branch 'tor-gitlab/mr/182' into master

 changes/bug23126                             |   4 +
 src/app/main/main.c                          |   2 +
 src/core/mainloop/mainloop.c                 |   6 +-
 src/core/or/command.c                        |  29 ++-
 src/core/or/or_circuit_st.h                  |   6 +
 src/feature/hs/hs_cache.c                    |   6 +-
 src/feature/hs_common/shared_random_client.c |  21 +-
 src/feature/relay/router.c                   |   5 +
 src/feature/rend/rendcache.c                 |   2 +-
 src/feature/stats/rephist.c                  | 346 +++++++++++++++++++--------
 src/feature/stats/rephist.h                  |  53 +++-
 src/test/hs_test_helpers.c                   |  19 +-
 src/test/hs_test_helpers.h                   |   4 +
 src/test/test_stats.c                        | 129 ++++++++++
 14 files changed, 513 insertions(+), 119 deletions(-)

diff --cc src/feature/stats/rephist.c
index 3c22fda3b8,1501e46b14..59f38fe603
--- a/src/feature/stats/rephist.c
+++ b/src/feature/stats/rephist.c
@@@ -1765,71 -1851,110 +1851,110 @@@ hs_v3_stats_free_(hs_v3_stats_t *victim
  /** Clear history of hidden service statistics and set the measurement
   * interval start to <b>now</b>. */
  static void
- rep_hist_reset_hs_stats(time_t now)
+ rep_hist_reset_hs_v3_stats(time_t now)
  {
-   if (!hs_stats) {
-     hs_stats = hs_stats_new();
+   if (!hs_v3_stats) {
+     hs_v3_stats = hs_v3_stats_new();
    }
  
-   hs_stats->rp_relay_cells_seen = 0;
+   digest256map_free(hs_v3_stats->v3_onions_seen_this_period, NULL);
+   hs_v3_stats->v3_onions_seen_this_period = digest256map_new();
  
-   digestmap_free(hs_stats->onions_seen_this_period, NULL);
-   hs_stats->onions_seen_this_period = digestmap_new();
+   hs_v3_stats->rp_v3_relay_cells_seen = 0;
  
-   start_of_hs_stats_interval = now;
+   start_of_hs_v3_stats_interval = now;
  }
  
- /** Stop collecting hidden service stats in a way that we can re-start
-  * doing so in rep_hist_buffer_stats_init(). */
- void
- rep_hist_hs_stats_term(void)
+ /** Return true if it's a good time to collect v3 stats.
+  *
+  *  v3 stats have a strict stats collection period (from 12:00UTC to 12:00UTC
+  *  on the real network). We don't want to collect statistics if (for example)
+  *  we just booted and it's 03:00UTC; we will wait until 12:00UTC before we
+  *  start collecting statistics to make sure that the final result represents
+  *  the whole collection period. This behavior is controlled by
+  *  rep_hist_hs_stats_init().
+  */
+ MOCK_IMPL(STATIC bool,
+ should_collect_v3_stats,(void))
  {
-   rep_hist_reset_hs_stats(0);
+   return start_of_hs_v3_stats_interval <= approx_time();
  }
  
- /** We saw a new HS relay cell, Count it! */
+ /** We just received a new descriptor with <b>blinded_key</b>. See if we've
+  * seen this blinded key before, and if not add it to the stats.  */
  void
- rep_hist_seen_new_rp_cell(void)
+ rep_hist_hsdir_stored_maybe_new_v3_onion(const uint8_t *blinded_key)
  {
-   if (!hs_stats) {
-     return; // We're not collecting stats
+   /* Return early if we don't collect HSv3 stats, or if it's not yet the time
+    * to collect them. */
+   if (!hs_v3_stats || !should_collect_v3_stats()) {
+     return;
    }
  
-   hs_stats->rp_relay_cells_seen++;
+   bool seen_before =
+     !!digest256map_get(hs_v3_stats->v3_onions_seen_this_period,
+                        blinded_key);
+ 
+   log_info(LD_GENERAL, "Considering v3 descriptor with %s (%sseen before)",
+            safe_str(hex_str((char*)blinded_key, 32)),
+            seen_before ? "" : "not ");
+ 
+   /* Count it if we haven't seen it before. */
+   if (!seen_before) {
+     digest256map_set(hs_v3_stats->v3_onions_seen_this_period,
+                   blinded_key, (void*)(uintptr_t)1);
+   }
  }
  
- /** As HSDirs, we saw another hidden service with public key
-  *  <b>pubkey</b>. Check whether we have counted it before, if not
-  *  count it now! */
+ /** We saw a new HS relay cell: count it!
+  *  If <b>is_v2</b> is set then it's a v2 RP cell, otherwise it's a v3. */
  void
- rep_hist_stored_maybe_new_hs(const crypto_pk_t *pubkey)
+ rep_hist_seen_new_rp_cell(bool is_v2)
  {
-   char pubkey_hash[DIGEST_LEN];
+   log_debug(LD_GENERAL, "New RP cell (%d)", is_v2);
  
-   if (!hs_stats) {
-     return; // We're not collecting stats
+   if (is_v2 && hs_v2_stats) {
+     hs_v2_stats->rp_v2_relay_cells_seen++;
+   } else if (!is_v2 && hs_v3_stats && should_collect_v3_stats()) {
+     hs_v3_stats->rp_v3_relay_cells_seen++;
    }
+ }
  
-   /* Get the digest of the pubkey which will be used to detect whether
-      we've seen this hidden service before or not.  */
-   if (crypto_pk_get_digest(pubkey, pubkey_hash) < 0) {
-     /*  This fail should not happen; key has been validated by
-         descriptor parsing code first. */
-     return;
+ /** Generic HS stats code */
+ 
+ /** Initialize v2 and v3 hidden service statistics. */
+ void
+ rep_hist_hs_stats_init(time_t now)
+ {
+   if (!hs_v2_stats) {
+     hs_v2_stats = hs_v2_stats_new();
    }
  
-   /* Check if this is the first time we've seen this hidden
-      service. If it is, count it as new. */
-   if (!digestmap_get(hs_stats->onions_seen_this_period,
-                      pubkey_hash)) {
-     digestmap_set(hs_stats->onions_seen_this_period,
-                   pubkey_hash, (void*)(uintptr_t)1);
+   /* Start collecting v2 stats straight away */
+   start_of_hs_v2_stats_interval = now;
+ 
+   if (!hs_v3_stats) {
+     hs_v3_stats = hs_v3_stats_new();
    }
+ 
+   /* Start collecting v3 stats at the next 12:00 UTC */
+   start_of_hs_v3_stats_interval = hs_get_start_time_of_next_time_period(now);
+ }
+ 
+ /** Stop collecting hidden service stats in a way that we can re-start
+  * doing so in rep_hist_buffer_stats_init(). */
+ void
+ rep_hist_hs_stats_term(void)
+ {
+   rep_hist_reset_hs_v2_stats(0);
+   rep_hist_reset_hs_v3_stats(0);
  }
  
+ /** Stats reporting code */
+ 
  /* The number of cells that are supposed to be hidden from the adversary
   * by adding noise from the Laplace distribution.  This value, divided by
 - * EPSILON, is Laplace parameter b. It must be greather than 0. */
 + * EPSILON, is Laplace parameter b. It must be greater than 0. */
  #define REND_CELLS_DELTA_F 2048
  /* Security parameter for obfuscating number of cells with a value between
   * ]0.0, 1.0]. Smaller values obfuscate observations more, but at the same

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