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[tor-commits] [tor/master] Refactor code that matches up routers with the same identity in votes
commit 6c564e6c081514bab56bacec89b1f6f9457a7022
Author: Nick Mathewson <nickm@xxxxxxxxxxxxxx>
Date: Wed Nov 12 14:29:05 2014 -0500
Refactor code that matches up routers with the same identity in votes
This makes 'routerstatus collation' into a first-class concept, so
we can change how that works for prop220.
---
src/or/dircollate.c | 122 +++++++++++++++++++++++++++++++++++++++++++++++++++
src/or/dircollate.h | 44 +++++++++++++++++++
src/or/dirvote.c | 98 ++++++++++++++---------------------------
src/or/include.am | 2 +
4 files changed, 200 insertions(+), 66 deletions(-)
diff --git a/src/or/dircollate.c b/src/or/dircollate.c
new file mode 100644
index 0000000..92f3dcc
--- /dev/null
+++ b/src/or/dircollate.c
@@ -0,0 +1,122 @@
+/* Copyright (c) 2001-2004, Roger Dingledine.
+ * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
+ * Copyright (c) 2007-2014, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+/**
+ * \file dircollate.c
+ *
+ * \brief Collation code for figuring out which identities to vote for in
+ * the directory voting process.
+ */
+
+#define DIRCOLLATE_PRIVATE
+#include "dircollate.h"
+
+static void dircollator_collate_by_rsa(dircollator_t *dc);
+
+static void
+dircollator_add_routerstatus(dircollator_t *dc,
+ int vote_num,
+ networkstatus_t *vote,
+ vote_routerstatus_t *vrs)
+{
+ const char *id = vrs->status.identity_digest;
+
+ (void) vote;
+ vote_routerstatus_t **vrs_lst = digestmap_get(dc->by_rsa_sha1, id);
+ if (NULL == vrs_lst) {
+ vrs_lst = tor_calloc(sizeof(vote_routerstatus_t *), dc->n_votes);
+ digestmap_set(dc->by_rsa_sha1, id, vrs_lst);
+ }
+
+ tor_assert(vrs_lst[vote_num] == NULL);
+ vrs_lst[vote_num] = vrs;
+}
+
+dircollator_t *
+dircollator_new(int n_votes, int n_authorities)
+{
+ dircollator_t *dc = tor_malloc_zero(sizeof(dircollator_t));
+
+ tor_assert(n_votes <= n_authorities);
+
+ dc->n_votes = n_votes;
+ dc->n_authorities = n_authorities;
+
+ dc->by_rsa_sha1 = digestmap_new();
+
+ return dc;
+}
+
+void
+dircollator_free(dircollator_t *dc)
+{
+ if (!dc)
+ return;
+
+ digestmap_free(dc->by_rsa_sha1, tor_free_);
+
+ tor_free(dc);
+}
+
+void
+dircollator_add_vote(dircollator_t *dc, networkstatus_t *v)
+{
+ tor_assert(v->type == NS_TYPE_VOTE);
+ tor_assert(dc->next_vote_num < dc->n_votes);
+ tor_assert(!dc->is_collated);
+
+ const int votenum = dc->next_vote_num++;
+
+ SMARTLIST_FOREACH_BEGIN(v->routerstatus_list, vote_routerstatus_t *, vrs) {
+ dircollator_add_routerstatus(dc, votenum, v, vrs);
+ } SMARTLIST_FOREACH_END(vrs);
+}
+
+void
+dircollator_collate(dircollator_t *dc)
+{
+ dircollator_collate_by_rsa(dc);
+}
+
+static void
+dircollator_collate_by_rsa(dircollator_t *dc)
+{
+ tor_assert(!dc->is_collated);
+
+ dc->all_rsa_sha1_lst = smartlist_new();
+
+ const int total_authorities = dc->n_authorities;
+
+ DIGESTMAP_FOREACH(dc->by_rsa_sha1, k, vote_routerstatus_t **, vrs_lst) {
+ int n = 0, i;
+ for (i = 0; i < dc->n_votes; ++i) {
+ if (vrs_lst[i] != NULL)
+ ++n;
+ }
+
+ if (n <= total_authorities / 2)
+ continue;
+
+ smartlist_add(dc->all_rsa_sha1_lst, (char *)k);
+ } DIGESTMAP_FOREACH_END;
+
+ smartlist_sort_digests(dc->all_rsa_sha1_lst);
+ dc->is_collated = 1;
+}
+
+int
+dircollator_n_routers(dircollator_t *dc)
+{
+ return smartlist_len(dc->all_rsa_sha1_lst);
+}
+
+vote_routerstatus_t **
+dircollator_get_votes_for_router(dircollator_t *dc, int idx)
+{
+ tor_assert(idx < smartlist_len(dc->all_rsa_sha1_lst));
+ return digestmap_get(dc->by_rsa_sha1,
+ smartlist_get(dc->all_rsa_sha1_lst, idx));
+}
+
diff --git a/src/or/dircollate.h b/src/or/dircollate.h
new file mode 100644
index 0000000..073b611
--- /dev/null
+++ b/src/or/dircollate.h
@@ -0,0 +1,44 @@
+/* Copyright (c) 2001 Matej Pfajfar.
+ * Copyright (c) 2001-2004, Roger Dingledine.
+ * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
+ * Copyright (c) 2007-2014, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+/**
+ * \file dirvote.h
+ * \brief Header file for dirvote.c.
+ **/
+
+#ifndef TOR_DIRCOLLATE_H
+#define TOR_DIRCOLLATE_H
+
+#include "testsupport.h"
+#include "or.h"
+
+typedef struct dircollator_s dircollator_t;
+
+dircollator_t *dircollator_new(int n_votes, int n_authorities);
+void dircollator_free(dircollator_t *obj);
+void dircollator_add_vote(dircollator_t *dc, networkstatus_t *v);
+
+void dircollator_collate(dircollator_t *dc);
+
+int dircollator_n_routers(dircollator_t *dc);
+vote_routerstatus_t **dircollator_get_votes_for_router(dircollator_t *dc,
+ int idx);
+
+#ifdef DIRCOLLATE_PRIVATE
+struct dircollator_s {
+ /**DOCDOC */
+ int is_collated;
+ int n_votes;
+ int n_authorities;
+
+ int next_vote_num;
+ digestmap_t *by_rsa_sha1;
+
+ smartlist_t *all_rsa_sha1_lst;
+};
+#endif
+
+#endif
diff --git a/src/or/dirvote.c b/src/or/dirvote.c
index 6c53b3c..6a70c13 100644
--- a/src/or/dirvote.c
+++ b/src/or/dirvote.c
@@ -6,6 +6,7 @@
#define DIRVOTE_PRIVATE
#include "or.h"
#include "config.h"
+#include "dircollate.h"
#include "directory.h"
#include "dirserv.h"
#include "dirvote.h"
@@ -782,28 +783,6 @@ networkstatus_check_weights(int64_t Wgg, int64_t Wgd, int64_t Wmg,
return berr;
}
-#if 0
-/** DOCDOC */
-static vote_identity_map_t *
-networkstatus_compute_identity_mapping(const smartlist_t *votes)
-{
- vote_identity_map_t *map = vote_identity_map_new();
-
- SMARTLIST_FOREACH_BEGIN(votes, networkstatus_t *, vote) {
- SMARTLIST_FOREACH_BEGIN(vote->routerstatus_list,
- vote_routerstatus_t *, vrs) {
- vote_identity_map_add(map, vrs->status.identity_digest,
- vrs->has_ed25519_listing ? vrs->ed25519_id : NULL,
- vote_sl_idx);
- } SMARTLIST_FOREACH_END(vrs);
- } SMARTLIST_FOREACH_END(vote);
-
- vote_identity_map_resolve(map);
-
- return map;
-}
-#endif
-
/**
* This function computes the bandwidth weights for consensus method 10.
*
@@ -1161,9 +1140,7 @@ networkstatus_compute_consensus(smartlist_t *votes,
char *params = NULL;
char *packages = NULL;
int added_weights = 0;
-#if 0
- vote_identity_map_t *id_map = NULL;
-#endif
+ dircollator_t *collator = NULL;
tor_assert(flavor == FLAV_NS || flavor == FLAV_MICRODESC);
tor_assert(total_authorities >= smartlist_len(votes));
@@ -1519,16 +1496,24 @@ networkstatus_compute_consensus(smartlist_t *votes,
}
);
-#if 0
- id_map = networkstatus_compute_identity_mapping(votes);
-#endif
+ /* Populate the collator */
+ collator = dircollator_new(smartlist_len(votes), total_authorities);
+ SMARTLIST_FOREACH_BEGIN(votes, networkstatus_t *, v) {
+ dircollator_add_vote(collator, v);
+ } SMARTLIST_FOREACH_END(v);
+
+ dircollator_collate(collator);
/* Now go through all the votes */
flag_counts = tor_calloc(smartlist_len(flags), sizeof(int));
- while (1) {
+ const int num_routers = dircollator_n_routers(collator);
+ for (i = 0; i < num_routers; ++i) {
+ vote_routerstatus_t **vrs_lst =
+ dircollator_get_votes_for_router(collator, i);
+
vote_routerstatus_t *rs;
routerstatus_t rs_out;
- const char *lowest_id = NULL;
+ const char *current_rsa_id = NULL;
const char *chosen_version;
const char *chosen_name = NULL;
int exitsummary_disagreement = 0;
@@ -1536,23 +1521,9 @@ networkstatus_compute_consensus(smartlist_t *votes,
int is_guard = 0, is_exit = 0, is_bad_exit = 0;
int naming_conflict = 0;
int n_listing = 0;
- int i;
char microdesc_digest[DIGEST256_LEN];
tor_addr_port_t alt_orport = {TOR_ADDR_NULL, 0};
- /* Of the next-to-be-considered digest in each voter, which is first? */
- SMARTLIST_FOREACH(votes, networkstatus_t *, v, {
- if (index[v_sl_idx] < size[v_sl_idx]) {
- rs = smartlist_get(v->routerstatus_list, index[v_sl_idx]);
- if (!lowest_id ||
- fast_memcmp(rs->status.identity_digest,
- lowest_id, DIGEST_LEN) < 0)
- lowest_id = rs->status.identity_digest;
- }
- });
- if (!lowest_id) /* we're out of routers. */
- break;
-
memset(flag_counts, 0, sizeof(int)*smartlist_len(flags));
smartlist_clear(matching_descs);
smartlist_clear(chosen_flags);
@@ -1562,29 +1533,25 @@ networkstatus_compute_consensus(smartlist_t *votes,
num_guardfraction_inputs = 0;
/* Okay, go through all the entries for this digest. */
- SMARTLIST_FOREACH_BEGIN(votes, networkstatus_t *, v) {
- if (index[v_sl_idx] >= size[v_sl_idx])
- continue; /* out of entries. */
- rs = smartlist_get(v->routerstatus_list, index[v_sl_idx]);
- if (fast_memcmp(rs->status.identity_digest, lowest_id, DIGEST_LEN))
- continue; /* doesn't include this router. */
- /* At this point, we know that we're looking at a routerstatus with
- * identity "lowest".
- */
- ++index[v_sl_idx];
+ for (int voter_idx = 0; voter_idx < smartlist_len(votes); ++voter_idx) {
+ if (vrs_lst[voter_idx] == NULL)
+ continue; /* This voter had nothig to say about this entry. */
+ rs = vrs_lst[voter_idx];
++n_listing;
+ current_rsa_id = rs->status.identity_digest;
+
smartlist_add(matching_descs, rs);
if (rs->version && rs->version[0])
smartlist_add(versions, rs->version);
/* Tally up all the flags. */
- for (i = 0; i < n_voter_flags[v_sl_idx]; ++i) {
- if (rs->flags & (U64_LITERAL(1) << i))
- ++flag_counts[flag_map[v_sl_idx][i]];
+ for (int flag = 0; flag < n_voter_flags[voter_idx]; ++flag) {
+ if (rs->flags & (U64_LITERAL(1) << flag))
+ ++flag_counts[flag_map[voter_idx][flag]];
}
- if (named_flag[v_sl_idx] >= 0 &&
- (rs->flags & (U64_LITERAL(1) << named_flag[v_sl_idx]))) {
+ if (named_flag[voter_idx] >= 0 &&
+ (rs->flags & (U64_LITERAL(1) << named_flag[voter_idx]))) {
if (chosen_name && strcmp(chosen_name, rs->status.nickname)) {
log_notice(LD_DIR, "Conflict on naming for router: %s vs %s",
chosen_name, rs->status.nickname);
@@ -1605,7 +1572,7 @@ networkstatus_compute_consensus(smartlist_t *votes,
if (rs->status.has_bandwidth)
bandwidths_kb[num_bandwidths++] = rs->status.bandwidth_kb;
- } SMARTLIST_FOREACH_END(v);
+ }
/* We don't include this router at all unless more than half of
* the authorities we believe in list it. */
@@ -1619,8 +1586,9 @@ networkstatus_compute_consensus(smartlist_t *votes,
microdesc_digest, &alt_orport);
/* Copy bits of that into rs_out. */
memset(&rs_out, 0, sizeof(rs_out));
- tor_assert(fast_memeq(lowest_id, rs->status.identity_digest,DIGEST_LEN));
- memcpy(rs_out.identity_digest, lowest_id, DIGEST_LEN);
+ tor_assert(fast_memeq(current_rsa_id,
+ rs->status.identity_digest,DIGEST_LEN));
+ memcpy(rs_out.identity_digest, current_rsa_id, DIGEST_LEN);
memcpy(rs_out.descriptor_digest, rs->status.descriptor_digest,
DIGEST_LEN);
rs_out.addr = rs->status.addr;
@@ -1644,7 +1612,7 @@ networkstatus_compute_consensus(smartlist_t *votes,
const char *d = strmap_get_lc(name_to_id_map, rs_out.nickname);
if (!d) {
is_named = is_unnamed = 0;
- } else if (fast_memeq(d, lowest_id, DIGEST_LEN)) {
+ } else if (fast_memeq(d, current_rsa_id, DIGEST_LEN)) {
is_named = 1; is_unnamed = 0;
} else {
is_named = 0; is_unnamed = 1;
@@ -2010,9 +1978,7 @@ networkstatus_compute_consensus(smartlist_t *votes,
done:
-#if 0
- vote_identity_map_free(id_map);
-#endif
+ dircollator_free(collator);
tor_free(client_versions);
tor_free(server_versions);
tor_free(packages);
diff --git a/src/or/include.am b/src/or/include.am
index 68f091b..9245ade 100644
--- a/src/or/include.am
+++ b/src/or/include.am
@@ -43,6 +43,7 @@ LIBTOR_A_SOURCES = \
src/or/connection_or.c \
src/or/control.c \
src/or/cpuworker.c \
+ src/or/dircollate.c \
src/or/directory.c \
src/or/dirserv.c \
src/or/dirvote.c \
@@ -151,6 +152,7 @@ ORHEADERS = \
src/or/connection_or.h \
src/or/control.h \
src/or/cpuworker.h \
+ src/or/dircollate.h \
src/or/directory.h \
src/or/dirserv.h \
src/or/dirvote.h \
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