/* Copyright (c) 2001-2004, Roger Dingledine.
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2008, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/* $Id$ */
const char dirvote_c_id[] =
"$Id$";
#define DIRVOTE_PRIVATE
#include "or.h"
/**
* \file dirvote.c
* \brief Functions to compute directory consensus, and schedule voting.
**/
static int dirvote_add_signatures_to_pending_consensus(
const char *detached_signatures_body,
const char **msg_out);
static char *list_v3_auth_ids(void);
static void dirvote_fetch_missing_votes(void);
static void dirvote_fetch_missing_signatures(void);
static int dirvote_perform_vote(void);
static void dirvote_clear_votes(int all_votes);
static int dirvote_compute_consensus(void);
static int dirvote_publish_consensus(void);
/* =====
* Voting
* =====*/
/** Return a new string containing the string representation of the vote in
* <b>v3_ns</b>, signed with our v3 signing key <b>private_signing_key</b>.
* For v3 authorities. */
char *
format_networkstatus_vote(crypto_pk_env_t *private_signing_key,
networkstatus_t *v3_ns)
{
size_t len;
char *status = NULL;
const char *client_versions = NULL, *server_versions = NULL;
char *outp, *endp;
char fingerprint[FINGERPRINT_LEN+1];
char ipaddr[INET_NTOA_BUF_LEN];
char digest[DIGEST_LEN];
struct in_addr in;
uint32_t addr;
routerlist_t *rl = router_get_routerlist();
char *version_lines = NULL;
networkstatus_voter_info_t *voter;
tor_assert(private_signing_key);
tor_assert(v3_ns->type == NS_TYPE_VOTE || v3_ns->type == NS_TYPE_OPINION);
voter = smartlist_get(v3_ns->voters, 0);
addr = voter->addr;
in.s_addr = htonl(addr);
tor_inet_ntoa(&in, ipaddr, sizeof(ipaddr));
base16_encode(fingerprint, sizeof(fingerprint),
v3_ns->cert->cache_info.identity_digest, DIGEST_LEN);
client_versions = v3_ns->client_versions;
server_versions = v3_ns->server_versions;
if (client_versions || server_versions) {
size_t v_len = 64;
char *cp;
if (client_versions)
v_len += strlen(client_versions);
if (server_versions)
v_len += strlen(server_versions);
version_lines = tor_malloc(v_len);
cp = version_lines;
if (client_versions) {
tor_snprintf(cp, v_len-(cp-version_lines),
"client-versions %s\n", client_versions);
cp += strlen(cp);
}
if (server_versions)
tor_snprintf(cp, v_len-(cp-version_lines),
"server-versions %s\n", server_versions);
} else {
version_lines = tor_strdup("");
}
len = 8192;
len += strlen(version_lines);
len += (RS_ENTRY_LEN)*smartlist_len(rl->routers);
len += v3_ns->cert->cache_info.signed_descriptor_len;
status = tor_malloc(len);
{
char published[ISO_TIME_LEN+1];
char va[ISO_TIME_LEN+1];
char fu[ISO_TIME_LEN+1];
char vu[ISO_TIME_LEN+1];
char *flags = smartlist_join_strings(v3_ns->known_flags, " ", 0, NULL);
authority_cert_t *cert = v3_ns->cert;
format_iso_time(published, v3_ns->published);
format_iso_time(va, v3_ns->valid_after);
format_iso_time(fu, v3_ns->fresh_until);
format_iso_time(vu, v3_ns->valid_until);
tor_assert(cert);
tor_snprintf(status, len,
"network-status-version 3\n"
"vote-status %s\n"
"consensus-methods 1 2 3 4 5\n"
"published %s\n"
"valid-after %s\n"
"fresh-until %s\n"
"valid-until %s\n"
"voting-delay %d %d\n"
"%s" /* versions */
"known-flags %s\n"
"dir-source %s %s %s %s %d %d\n"
"contact %s\n",
v3_ns->type == NS_TYPE_VOTE ? "vote" : "opinion",
published, va, fu, vu,
v3_ns->vote_seconds, v3_ns->dist_seconds,
version_lines,
flags,
voter->nickname, fingerprint, voter->address,
ipaddr, voter->dir_port, voter->or_port, voter->contact);
tor_free(flags);
outp = status + strlen(status);
endp = status + len;
if (!tor_digest_is_zero(voter->legacy_id_digest)) {
char fpbuf[HEX_DIGEST_LEN+1];
base16_encode(fpbuf, sizeof(fpbuf), voter->legacy_id_digest, DIGEST_LEN);
tor_snprintf(outp, endp-outp, "legacy-dir-key %s\n", fpbuf);
outp += strlen(outp);
}
tor_assert(outp + cert->cache_info.signed_descriptor_len < endp);
memcpy(outp, cert->cache_info.signed_descriptor_body,
cert->cache_info.signed_descriptor_len);
outp += cert->cache_info.signed_descriptor_len;
}
SMARTLIST_FOREACH(v3_ns->routerstatus_list, vote_routerstatus_t *, vrs,
{
if (routerstatus_format_entry(outp, endp-outp, &vrs->status,
vrs->version, 0, 0) < 0) {
log_warn(LD_BUG, "Unable to print router status.");
goto err;
}
outp += strlen(outp);
});
{
char signing_key_fingerprint[FINGERPRINT_LEN+1];
if (tor_snprintf(outp, endp-outp, "directory-signature ")<0) {
log_warn(LD_BUG, "Unable to start signature line.");
goto err;
}
outp += strlen(outp);
if (crypto_pk_get_fingerprint(private_signing_key,
signing_key_fingerprint, 0)<0) {
log_warn(LD_BUG, "Unable to get fingerprint for signing key");
goto err;
}
if (tor_snprintf(outp, endp-outp, "%s %s\n", fingerprint,
signing_key_fingerprint)<0) {
log_warn(LD_BUG, "Unable to end signature line.");
goto err;
}
outp += strlen(outp);
}
if (router_get_networkstatus_v3_hash(status, digest)<0)
goto err;
note_crypto_pk_op(SIGN_DIR);
if (router_append_dirobj_signature(outp,endp-outp,digest,
private_signing_key)<0) {
log_warn(LD_BUG, "Unable to sign networkstatus vote.");
goto err;
}
{
networkstatus_t *v;
if (!(v = networkstatus_parse_vote_from_string(status, NULL,
v3_ns->type))) {
log_err(LD_BUG,"Generated a networkstatus %s we couldn't parse: "
"<<%s>>",
v3_ns->type == NS_TYPE_VOTE ? "vote" : "opinion", status);
goto err;
}
networkstatus_vote_free(v);
}
goto done;
err:
tor_free(status);
done:
tor_free(version_lines);
return status;
}
/* =====
* Consensus generation
* ===== */
/** Given a vote <b>vote</b> (not a consensus!), return its associated
* networkstatus_voter_info_t. */
static networkstatus_voter_info_t *
get_voter(const networkstatus_t *vote)
{
tor_assert(vote);
tor_assert(vote->type == NS_TYPE_VOTE);
tor_assert(vote->voters);
tor_assert(smartlist_len(vote->voters) == 1);
return smartlist_get(vote->voters, 0);
}
/** Temporary structure used in constructing a list of dir-source entries
* for a consensus. One of these is generated for every vote, and one more
* for every legacy key in each vote. */
typedef struct dir_src_ent_t {
networkstatus_t *v;
const char *digest;
int is_legacy;
} dir_src_ent_t;
/** Helper for sorting networkstatus_t votes (not consensuses) by the
* hash of their voters' identity digests. */
static int
_compare_votes_by_authority_id(const void **_a, const void **_b)
{
const networkstatus_t *a = *_a, *b = *_b;
return memcmp(get_voter(a)->identity_digest,
get_voter(b)->identity_digest, DIGEST_LEN);
}
/** Helper: Compare the dir_src_ent_ts in *<b>_a</b> and *<b>_b</b> by
* their identity digests, and return -1, 0, or 1 depending on their
* ordering */
static int
_compare_dir_src_ents_by_authority_id(const void **_a, const void **_b)
{
const dir_src_ent_t *a = *_a, *b = *_b;
const networkstatus_voter_info_t *a_v = get_voter(a->v),
*b_v = get_voter(b->v);
const char *a_id, *b_id;
a_id = a->is_legacy ? a_v->legacy_id_digest : a_v->identity_digest;
b_id = b->is_legacy ? b_v->legacy_id_digest : b_v->identity_digest;
return memcmp(a_id, b_id, DIGEST_LEN);
}
/** Given a sorted list of strings <b>in</b>, add every member to <b>out</b>
* that occurs more than <b>min</b> times. */
static void
get_frequent_members(smartlist_t *out, smartlist_t *in, int min)
{
char *cur = NULL;
int count = 0;
SMARTLIST_FOREACH(in, char *, cp,
{
if (cur && !strcmp(cp, cur)) {
++count;
} else {
if (count > min)
smartlist_add(out, cur);
cur = cp;
count = 1;
}
});
if (count > min)
smartlist_add(out, cur);
}
/** Given a sorted list of strings <b>lst</b>, return the member that appears
* most. Break ties in favor of later-occurring members. */
static const char *
get_most_frequent_member(smartlist_t *lst)
{
const char *most_frequent = NULL;
int most_frequent_count = 0;
const char *cur = NULL;
int count = 0;
SMARTLIST_FOREACH(lst, const char *, s,
{
if (cur && !strcmp(s, cur)) {
++count;
} else {
if (count >= most_frequent_count) {
most_frequent = cur;
most_frequent_count = count;
}
cur = s;
count = 1;
}
});
if (count >= most_frequent_count) {
most_frequent = cur;
most_frequent_count = count;
}
return most_frequent;
}
/** Return 0 if and only if <b>a</b> and <b>b</b> are routerstatuses
* that come from the same routerinfo, with the same derived elements.
*/
static int
compare_vote_rs(const vote_routerstatus_t *a, const vote_routerstatus_t *b)
{
int r;
if ((r = memcmp(a->status.identity_digest, b->status.identity_digest,
DIGEST_LEN)))
return r;
if ((r = memcmp(a->status.descriptor_digest, b->status.descriptor_digest,
DIGEST_LEN)))
return r;
if ((r = (int)(b->status.published_on - a->status.published_on)))
return r;
if ((r = strcmp(b->status.nickname, a->status.nickname)))
return r;
if ((r = (((int)b->status.addr) - ((int)a->status.addr))))
return r;
if ((r = (((int)b->status.or_port) - ((int)a->status.or_port))))
return r;
if ((r = (((int)b->status.dir_port) - ((int)a->status.dir_port))))
return r;
return 0;
}
/** Helper for sorting routerlists based on compare_vote_rs. */
static int
_compare_vote_rs(const void **_a, const void **_b)
{
const vote_routerstatus_t *a = *_a, *b = *_b;
return compare_vote_rs(a,b);
}
/** Given a list of vote_routerstatus_t, all for the same router identity,
* return whichever is most frequent, breaking ties in favor of more
* recently published vote_routerstatus_t and in case of ties there,
* in favour of smaller descriptor digest.
*/
static vote_routerstatus_t *
compute_routerstatus_consensus(smartlist_t *votes)
{
vote_routerstatus_t *most = NULL, *cur = NULL;
int most_n = 0, cur_n = 0;
time_t most_published = 0;
/* _compare_vote_rs() sorts the items by identity digest (all the same),
* then by SD digest. That way, if we have a tie that the published_on
* date cannot tie, we use the descriptor with the smaller digest.
*/
smartlist_sort(votes, _compare_vote_rs);
SMARTLIST_FOREACH(votes, vote_routerstatus_t *, rs,
{
if (cur && !compare_vote_rs(cur, rs)) {
++cur_n;
} else {
if (cur_n > most_n ||
(cur && cur_n == most_n &&
cur->status.published_on > most_published)) {
most = cur;
most_n = cur_n;
most_published = cur->status.published_on;
}
cur_n = 1;
cur = rs;
}
});
if (cur_n > most_n ||
(cur && cur_n == most_n && cur->status.published_on > most_published)) {
most = cur;
most_n = cur_n;
most_published = cur->status.published_on;
}
tor_assert(most);
return most;
}
/** Given a list of strings in <b>lst</b>, set the DIGEST_LEN-byte digest at
* <b>digest_out</b> to the hash of the concatenation of those strings. */
static void
hash_list_members(char *digest_out, smartlist_t *lst)
{
crypto_digest_env_t *d = crypto_new_digest_env();
SMARTLIST_FOREACH(lst, const char *, cp,
crypto_digest_add_bytes(d, cp, strlen(cp)));
crypto_digest_get_digest(d, digest_out, DIGEST_LEN);
crypto_free_digest_env(d);
}
/** Sorting helper: compare two strings based on their values as base-ten
* positive integers. (Non-integers are treated as prior to all integers, and
* compared lexically.) */
static int
_cmp_int_strings(const void **_a, const void **_b)
{
const char *a = *_a, *b = *_b;
int ai = (int)tor_parse_long(a, 10, 1, INT_MAX, NULL, NULL);
int bi = (int)tor_parse_long(b, 10, 1, INT_MAX, NULL, NULL);
if (ai<bi) {
return -1;
} else if (ai==bi) {
if (ai == 0) /* Parsing failed. */
return strcmp(a, b);
return 0;
} else {
return 1;
}
}
/** Given a list of networkstatus_t votes, determine and return the number of
* the highest consensus method that is supported by 2/3 of the voters. */
static int
compute_consensus_method(smartlist_t *votes)
{
smartlist_t *all_methods = smartlist_create();
smartlist_t *acceptable_methods = smartlist_create();
smartlist_t *tmp = smartlist_create();
int min = (smartlist_len(votes) * 2) / 3;
int n_ok;
int result;
SMARTLIST_FOREACH(votes, networkstatus_t *, vote,
{
tor_assert(vote->supported_methods);
smartlist_add_all(tmp, vote->supported_methods);
smartlist_sort(tmp, _cmp_int_strings);
smartlist_uniq(tmp, _cmp_int_strings, NULL);
smartlist_add_all(all_methods, tmp);
smartlist_clear(tmp);
});
smartlist_sort(all_methods, _cmp_int_strings);
get_frequent_members(acceptable_methods, all_methods, min);
n_ok = smartlist_len(acceptable_methods);
if (n_ok) {
const char *best = smartlist_get(acceptable_methods, n_ok-1);
result = (int)tor_parse_long(best, 10, 1, INT_MAX, NULL, NULL);
} else {
result = 1;
}
smartlist_free(tmp);
smartlist_free(all_methods);
smartlist_free(acceptable_methods);
return result;
}
/** Return true iff <b>method</b> is a consensus method that we support. */
static int
consensus_method_is_supported(int method)
{
return (method >= 1) && (method <= 5);
}
/** Helper: given <b>lst</b>, a list of version strings such that every
* version appears once for every versioning voter who recommends it, returna
* newly allocated string holding the resulting client-versions or
* server-versions list. May change contents of <b>lst</b> */
static char *
compute_consensus_versions_list(smartlist_t *lst, int n_versioning)
{
int min = n_versioning / 2;
smartlist_t *good = smartlist_create();
char *result;
sort_version_list(lst, 0);
get_frequent_members(good, lst, min);
result = smartlist_join_strings(good, ",", 0, NULL);
smartlist_free(good);
return result;
}
/** Given a list of vote networkstatus_t in <b>votes</b>, our public
* authority <b>identity_key</b>, our private authority <b>signing_key</b>,
* and the number of <b>total_authorities</b> that we believe exist in our
* voting quorum, generate the text of a new v3 consensus vote, and return the
* value in a newly allocated string.
*
* Note: this function DOES NOT check whether the votes are from
* recognized authorities. (dirvote_add_vote does that.) */
char *
networkstatus_compute_consensus(smartlist_t *votes,
int total_authorities,
crypto_pk_env_t *identity_key,
crypto_pk_env_t *signing_key,
const char *legacy_id_key_digest,
crypto_pk_env_t *legacy_signing_key)
{
smartlist_t *chunks;
char *result = NULL;
int consensus_method;
time_t valid_after, fresh_until, valid_until;
int vote_seconds, dist_seconds;
char *client_versions = NULL, *server_versions = NULL;
smartlist_t *flags;
tor_assert(total_authorities >= smartlist_len(votes));
if (!smartlist_len(votes)) {
log_warn(LD_DIR, "Can't compute a consensus from no votes.");
return NULL;
}
flags = smartlist_create();
consensus_method = compute_consensus_method(votes);
if (consensus_method_is_supported(consensus_method)) {
log_info(LD_DIR, "Generating consensus using method %d.",
consensus_method);
} else {
log_warn(LD_DIR, "The other authorities will use consensus method %d, "
"which I don't support. Maybe I should upgrade!",
consensus_method);
consensus_method = 1;
}
/* Compute medians of time-related things, and figure out how many
* routers we might need to talk about. */
{
int n_votes = smartlist_len(votes);
time_t *va_times = tor_malloc(n_votes * sizeof(time_t));
time_t *fu_times = tor_malloc(n_votes * sizeof(time_t));
time_t *vu_times = tor_malloc(n_votes * sizeof(time_t));
int *votesec_list = tor_malloc(n_votes * sizeof(int));
int *distsec_list = tor_malloc(n_votes * sizeof(int));
int n_versioning_clients = 0, n_versioning_servers = 0;
smartlist_t *combined_client_versions = smartlist_create();
smartlist_t *combined_server_versions = smartlist_create();
SMARTLIST_FOREACH_BEGIN(votes, networkstatus_t *, v) {
tor_assert(v->type == NS_TYPE_VOTE);
va_times[v_sl_idx] = v->valid_after;
fu_times[v_sl_idx] = v->fresh_until;
vu_times[v_sl_idx] = v->valid_until;
votesec_list[v_sl_idx] = v->vote_seconds;
distsec_list[v_sl_idx] = v->dist_seconds;
if (v->client_versions) {
smartlist_t *cv = smartlist_create();
++n_versioning_clients;
smartlist_split_string(cv, v->client_versions, ",",
SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
sort_version_list(cv, 1);
smartlist_add_all(combined_client_versions, cv);
smartlist_free(cv); /* elements get freed later. */
}
if (v->server_versions) {
smartlist_t *sv = smartlist_create();
++n_versioning_servers;
smartlist_split_string(sv, v->server_versions, ",",
SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
sort_version_list(sv, 1);
smartlist_add_all(combined_server_versions, sv);
smartlist_free(sv); /* elements get freed later. */
}
SMARTLIST_FOREACH(v->known_flags, const char *, cp,
smartlist_add(flags, tor_strdup(cp)));
} SMARTLIST_FOREACH_END(v);
valid_after = median_time(va_times, n_votes);
fresh_until = median_time(fu_times, n_votes);
valid_until = median_time(vu_times, n_votes);
vote_seconds = median_int(votesec_list, n_votes);
dist_seconds = median_int(distsec_list, n_votes);
tor_assert(valid_after+MIN_VOTE_INTERVAL <= fresh_until);
tor_assert(fresh_until+MIN_VOTE_INTERVAL <= valid_until);
tor_assert(vote_seconds >= MIN_VOTE_SECONDS);
tor_assert(dist_seconds >= MIN_DIST_SECONDS);
server_versions = compute_consensus_versions_list(combined_server_versions,
n_versioning_servers);
client_versions = compute_consensus_versions_list(combined_client_versions,
n_versioning_clients);
SMARTLIST_FOREACH(combined_server_versions, char *, cp, tor_free(cp));
SMARTLIST_FOREACH(combined_client_versions, char *, cp, tor_free(cp));
smartlist_free(combined_server_versions);
smartlist_free(combined_client_versions);
smartlist_sort_strings(flags);
smartlist_uniq_strings(flags);
tor_free(va_times);
tor_free(fu_times);
tor_free(vu_times);
tor_free(votesec_list);
tor_free(distsec_list);
}
chunks = smartlist_create();
{
char buf[1024];
char va_buf[ISO_TIME_LEN+1], fu_buf[ISO_TIME_LEN+1],
vu_buf[ISO_TIME_LEN+1];
char *flaglist;
format_iso_time(va_buf, valid_after);
format_iso_time(fu_buf, fresh_until);
format_iso_time(vu_buf, valid_until);
flaglist = smartlist_join_strings(flags, " ", 0, NULL);
smartlist_add(chunks, tor_strdup("network-status-version 3\n"
"vote-status consensus\n"));
if (consensus_method >= 2) {
tor_snprintf(buf, sizeof(buf), "consensus-method %d\n",
consensus_method);
smartlist_add(chunks, tor_strdup(buf));
}
tor_snprintf(buf, sizeof(buf),
"valid-after %s\n"
"fresh-until %s\n"
"valid-until %s\n"
"voting-delay %d %d\n"
"client-versions %s\n"
"server-versions %s\n"
"known-flags %s\n",
va_buf, fu_buf, vu_buf,
vote_seconds, dist_seconds,
client_versions, server_versions, flaglist);
smartlist_add(chunks, tor_strdup(buf));
tor_free(flaglist);
}
/* Sort the votes. */
smartlist_sort(votes, _compare_votes_by_authority_id);
/* Add the authority sections. */
{
smartlist_t *dir_sources = smartlist_create();
SMARTLIST_FOREACH(votes, networkstatus_t *, v,
{
dir_src_ent_t *e = tor_malloc_zero(sizeof(dir_src_ent_t));
e->v = v;
e->digest = get_voter(v)->identity_digest;
e->is_legacy = 0;
smartlist_add(dir_sources, e);
if (consensus_method >= 3 &&
!tor_digest_is_zero(get_voter(v)->legacy_id_digest)) {
dir_src_ent_t *e_legacy = tor_malloc_zero(sizeof(dir_src_ent_t));
e_legacy->v = v;
e_legacy->digest = get_voter(v)->legacy_id_digest;
e_legacy->is_legacy = 1;
smartlist_add(dir_sources, e_legacy);
}
});
smartlist_sort(dir_sources, _compare_dir_src_ents_by_authority_id);
SMARTLIST_FOREACH(dir_sources, const dir_src_ent_t *, e,
{
char buf[1024];
struct in_addr in;
char ip[INET_NTOA_BUF_LEN];
char fingerprint[HEX_DIGEST_LEN+1];
char votedigest[HEX_DIGEST_LEN+1];
networkstatus_t *v = e->v;
networkstatus_voter_info_t *voter = get_voter(v);
if (e->is_legacy)
tor_assert(consensus_method >= 2);
in.s_addr = htonl(voter->addr);
tor_inet_ntoa(&in, ip, sizeof(ip));
base16_encode(fingerprint, sizeof(fingerprint), e->digest, DIGEST_LEN);
base16_encode(votedigest, sizeof(votedigest), voter->vote_digest,
DIGEST_LEN);
tor_snprintf(buf, sizeof(buf),
"dir-source %s%s %s %s %s %d %d\n",
voter->nickname, e->is_legacy ? "-legacy" : "",
fingerprint, voter->address, ip,
voter->dir_port,
voter->or_port);
smartlist_add(chunks, tor_strdup(buf));
if (! e->is_legacy) {
tor_snprintf(buf, sizeof(buf),
"contact %s\n"
"vote-digest %s\n",
voter->contact,
votedigest);
smartlist_add(chunks, tor_strdup(buf));
}
});
SMARTLIST_FOREACH(dir_sources, dir_src_ent_t *, e, tor_free(e));
smartlist_free(dir_sources);
}
/* Add the actual router entries. */
{
int *index; /* index[j] is the current index into votes[j]. */
int *size; /* size[j] is the number of routerstatuses in votes[j]. */
int *flag_counts; /* The number of voters that list flag[j] for the
* currently considered router. */
int i;
smartlist_t *matching_descs = smartlist_create();
smartlist_t *chosen_flags = smartlist_create();
smartlist_t *versions = smartlist_create();
smartlist_t *exitsummaries = smartlist_create();
uint32_t *bandwidths = tor_malloc(sizeof(uint32_t) * smartlist_len(votes));
int num_bandwidths;
int *n_voter_flags; /* n_voter_flags[j] is the number of flags that
* votes[j] knows about. */
int *n_flag_voters; /* n_flag_voters[f] is the number of votes that care
* about flags[f]. */
int **flag_map; /* flag_map[j][b] is an index f such that flag_map[f]
* is the same flag as votes[j]->known_flags[b]. */
int *named_flag; /* Index of the flag "Named" for votes[j] */
int *unnamed_flag; /* Index of the flag "Unnamed" for votes[j] */
int chosen_named_idx, chosen_unnamed_idx;
strmap_t *name_to_id_map = strmap_new();
char conflict[DIGEST_LEN];
char unknown[DIGEST_LEN];
memset(conflict, 0, sizeof(conflict));
memset(unknown, 0xff, sizeof(conflict));
index = tor_malloc_zero(sizeof(int)*smartlist_len(votes));
size = tor_malloc_zero(sizeof(int)*smartlist_len(votes));
n_voter_flags = tor_malloc_zero(sizeof(int) * smartlist_len(votes));
n_flag_voters = tor_malloc_zero(sizeof(int) * smartlist_len(flags));
flag_map = tor_malloc_zero(sizeof(int*) * smartlist_len(votes));
named_flag = tor_malloc_zero(sizeof(int) * smartlist_len(votes));
unnamed_flag = tor_malloc_zero(sizeof(int) * smartlist_len(votes));
for (i = 0; i < smartlist_len(votes); ++i)
unnamed_flag[i] = named_flag[i] = -1;
chosen_named_idx = smartlist_string_pos(flags, "Named");
chosen_unnamed_idx = smartlist_string_pos(flags, "Unnamed");
/* Build the flag index. */
SMARTLIST_FOREACH(votes, networkstatus_t *, v,
{
flag_map[v_sl_idx] = tor_malloc_zero(
sizeof(int)*smartlist_len(v->known_flags));
SMARTLIST_FOREACH(v->known_flags, const char *, fl,
{
int p = smartlist_string_pos(flags, fl);
tor_assert(p >= 0);
flag_map[v_sl_idx][fl_sl_idx] = p;
++n_flag_voters[p];
if (!strcmp(fl, "Named"))
named_flag[v_sl_idx] = fl_sl_idx;
if (!strcmp(fl, "Unnamed"))
unnamed_flag[v_sl_idx] = fl_sl_idx;
});
n_voter_flags[v_sl_idx] = smartlist_len(v->known_flags);
size[v_sl_idx] = smartlist_len(v->routerstatus_list);
});
/* Named and Unnamed get treated specially */
if (consensus_method >= 2) {
SMARTLIST_FOREACH(votes, networkstatus_t *, v,
{
uint64_t nf;
if (named_flag[v_sl_idx]<0)
continue;
nf = U64_LITERAL(1) << named_flag[v_sl_idx];
SMARTLIST_FOREACH(v->routerstatus_list, vote_routerstatus_t *, rs,
{
if ((rs->flags & nf) != 0) {
const char *d = strmap_get_lc(name_to_id_map, rs->status.nickname);
if (!d) {
/* We have no name officially mapped to this digest. */
strmap_set_lc(name_to_id_map, rs->status.nickname,
rs->status.identity_digest);
} else if (d != conflict &&
memcmp(d, rs->status.identity_digest, DIGEST_LEN)) {
/* Authorities disagree about this nickname. */
strmap_set_lc(name_to_id_map, rs->status.nickname, conflict);
} else {
/* It's already a conflict, or it's already this ID. */
}
}
});
});
SMARTLIST_FOREACH(votes, networkstatus_t *, v,
{
uint64_t uf;
if (unnamed_flag[v_sl_idx]<0)
continue;
uf = U64_LITERAL(1) << unnamed_flag[v_sl_idx];
SMARTLIST_FOREACH(v->routerstatus_list, vote_routerstatus_t *, rs,
{
if ((rs->flags & uf) != 0) {
const char *d = strmap_get_lc(name_to_id_map, rs->status.nickname);
if (d == conflict || d == unknown) {
/* Leave it alone; we know what it is. */
} else if (!d) {
/* We have no name officially mapped to this digest. */
strmap_set_lc(name_to_id_map, rs->status.nickname, unknown);
} else if (!memcmp(d, rs->status.identity_digest, DIGEST_LEN)) {
/* Authorities disagree about this nickname. */
strmap_set_lc(name_to_id_map, rs->status.nickname, conflict);
} else {
/* It's mapped to a different name. */
}
}
});
});
}
/* Now go through all the votes */
flag_counts = tor_malloc(sizeof(int) * smartlist_len(flags));
while (1) {
vote_routerstatus_t *rs;
routerstatus_t rs_out;
const char *lowest_id = NULL;
const char *chosen_version;
const char *chosen_name = NULL;
int exitsummary_disagreement = 0;
int is_named = 0, is_unnamed = 0, is_running = 0;
int naming_conflict = 0;
int n_listing = 0;
int i;
char buf[256];
/* 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 ||
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);
smartlist_clear(versions);
num_bandwidths = 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 (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 routersatus with
* identity "lowest".
*/
++index[v_sl_idx];
++n_listing;
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]];
}
if (rs->flags & (U64_LITERAL(1) << named_flag[v_sl_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);
naming_conflict = 1;
}
chosen_name = rs->status.nickname;
}
/* count bandwidths */
if (rs->status.has_bandwidth)
bandwidths[num_bandwidths++] = rs->status.bandwidth;
} SMARTLIST_FOREACH_END(v);
/* We don't include this router at all unless more than half of
* the authorities we believe in list it. */
if (n_listing <= total_authorities/2)
continue;
/* Figure out the most popular opinion of what the most recent
* routerinfo and its contents are. */
rs = compute_routerstatus_consensus(matching_descs);
/* Copy bits of that into rs_out. */
tor_assert(!memcmp(lowest_id, rs->status.identity_digest, DIGEST_LEN));
memcpy(rs_out.identity_digest, lowest_id, DIGEST_LEN);
memcpy(rs_out.descriptor_digest, rs->status.descriptor_digest,
DIGEST_LEN);
rs_out.addr = rs->status.addr;
rs_out.published_on = rs->status.published_on;
rs_out.dir_port = rs->status.dir_port;
rs_out.or_port = rs->status.or_port;
rs_out.has_bandwidth = 0;
rs_out.has_exitsummary = 0;
if (chosen_name && !naming_conflict) {
strlcpy(rs_out.nickname, chosen_name, sizeof(rs_out.nickname));
} else {
strlcpy(rs_out.nickname, rs->status.nickname, sizeof(rs_out.nickname));
}
if (consensus_method == 1) {
is_named = chosen_named_idx >= 0 &&
(!naming_conflict && flag_counts[chosen_named_idx]);
} else {
const char *d = strmap_get_lc(name_to_id_map, rs_out.nickname);
if (!d) {
is_named = is_unnamed = 0;
} else if (!memcmp(d, lowest_id, DIGEST_LEN)) {
is_named = 1; is_unnamed = 0;
} else {
is_named = 0; is_unnamed = 1;
}
}
/* Set the flags. */
smartlist_add(chosen_flags, (char*)"s"); /* for the start of the line. */
SMARTLIST_FOREACH(flags, const char *, fl,
{
if (!strcmp(fl, "Named")) {
if (is_named)
smartlist_add(chosen_flags, (char*)fl);
} else if (!strcmp(fl, "Unnamed") && consensus_method >= 2) {
if (is_unnamed)
smartlist_add(chosen_flags, (char*)fl);
} else {
if (flag_counts[fl_sl_idx] > n_flag_voters[fl_sl_idx]/2) {
smartlist_add(chosen_flags, (char*)fl);
if (!strcmp(fl, "Running"))
is_running = 1;
}
}
});
/* Starting with consensus method 4 we do not list servers
* that are not running in a consensus. See Proposal 138 */
if (consensus_method >= 4 && !is_running)
continue;
/* Pick the version. */
if (smartlist_len(versions)) {
sort_version_list(versions, 0);
chosen_version = get_most_frequent_member(versions);
} else {
chosen_version = NULL;
}
/* Pick a bandwidth */
if (consensus_method >= 5 && num_bandwidths > 0) {
rs_out.has_bandwidth = 1;
rs_out.bandwidth = median_uint32(bandwidths, num_bandwidths);
}
/* Ok, we already picked a descriptor digest we want to list
* previously. Now we want to use the exit policy summary from
* that descriptor. If everybody plays nice all the voters who
* listed that descriptor will have the same summary. If not then
* something is fishy and we'll use the most common one (breaking
* ties in favor of lexigraphically larger one (only because it
* lets me reuse more existing code.
*
* The other case that can happen is that no authority that voted
* for that descriptor has an exit policy summary. That's
* probably quite unlikely but can happen. In that case we use
* the policy that was most often listed in votes, again breaking
* ties like in the previous case.
*/
if (consensus_method >= 5) {
/* Okay, go through all the votes for this router. We prepared
* that list previously */
const char *chosen_exitsummary = NULL;
smartlist_clear(exitsummaries);
SMARTLIST_FOREACH(matching_descs, vote_routerstatus_t *, vsr, {
/* Check if the vote where this status comes from had the
* proper descriptor */
tor_assert(!memcmp(rs_out.identity_digest,
vsr->status.identity_digest,
DIGEST_LEN));
if (vsr->status.has_exitsummary &&
!memcmp(rs_out.descriptor_digest,
vsr->status.descriptor_digest,
DIGEST_LEN)) {
tor_assert(vsr->status.exitsummary);
smartlist_add(exitsummaries, vsr->status.exitsummary);
if (!chosen_exitsummary) {
chosen_exitsummary = vsr->status.exitsummary;
} else if (strcmp(chosen_exitsummary, vsr->status.exitsummary)) {
/* Great. There's disagreement among the voters. That
* really shouldn't be */
exitsummary_disagreement = 1;
}
}
});
if (exitsummary_disagreement) {
char id[HEX_DIGEST_LEN+1];
char dd[HEX_DIGEST_LEN+1];
base16_encode(id, sizeof(dd), rs_out.identity_digest, DIGEST_LEN);
base16_encode(dd, sizeof(dd), rs_out.descriptor_digest, DIGEST_LEN);
log_warn(LD_DIR, "The voters disgreed on the exit policy summary for"
" router %s with descriptor %s. This really shouldn't"
" have happened.", id, dd);
smartlist_sort_strings(exitsummaries);
chosen_exitsummary = get_most_frequent_member(exitsummaries);
} else if (!chosen_exitsummary) {
char id[HEX_DIGEST_LEN+1];
char dd[HEX_DIGEST_LEN+1];
base16_encode(id, sizeof(dd), rs_out.identity_digest, DIGEST_LEN);
base16_encode(dd, sizeof(dd), rs_out.descriptor_digest, DIGEST_LEN);
log_warn(LD_DIR, "Not one of the voters that made us select"
"descriptor %s for router %s had an exit policy"
"summary", dd, id);
/* Ok, none of those voting for the digest we chose had an
* exit policy for us. Well, that kinda sucks.
*/
smartlist_clear(exitsummaries);
SMARTLIST_FOREACH(matching_descs, vote_routerstatus_t *, vsr, {
if (vsr->status.has_exitsummary)
smartlist_add(exitsummaries, vsr->status.exitsummary);
});
smartlist_sort_strings(exitsummaries);
chosen_exitsummary = get_most_frequent_member(exitsummaries);
if (!chosen_exitsummary)
log_warn(LD_DIR, "Wow, not one of the voters had an exit "
"policy summary for %s. Wow.", id);
}
if (chosen_exitsummary) {
rs_out.has_exitsummary = 1;
/* yea, discards the const */
rs_out.exitsummary = (char *)chosen_exitsummary;
}
}
/* Okay!! Now we can write the descriptor... */
/* First line goes into "buf". */
routerstatus_format_entry(buf, sizeof(buf), &rs_out, NULL, 1, 0);
smartlist_add(chunks, tor_strdup(buf));
/* Second line is all flags. The "\n" is missing. */
smartlist_add(chunks,
smartlist_join_strings(chosen_flags, " ", 0, NULL));
/* Now the version line. */
if (chosen_version) {
smartlist_add(chunks, tor_strdup("\nv "));
smartlist_add(chunks, tor_strdup(chosen_version));
}
smartlist_add(chunks, tor_strdup("\n"));
/* Now the weight line. */
if (rs_out.has_bandwidth) {
int r = tor_snprintf(buf, sizeof(buf),
"w Bandwidth=%d\n", rs_out.bandwidth);
if (r<0) {
log_warn(LD_BUG, "Not enough space in buffer for weight line.");
*buf = '\0';
}
smartlist_add(chunks, tor_strdup(buf));
};
/* Now the exitpolicy summary line. */
if (rs_out.has_exitsummary) {
char buf[MAX_POLICY_LINE_LEN+1];
int r = tor_snprintf(buf, sizeof(buf), "p %s\n", rs_out.exitsummary);
if (r<0) {
log_warn(LD_BUG, "Not enough space in buffer for exitpolicy line.");
*buf = '\0';
}
smartlist_add(chunks, tor_strdup(buf));
};
/* And the loop is over and we move on to the next router */
}
tor_free(index);
tor_free(size);
tor_free(n_voter_flags);
tor_free(n_flag_voters);
for (i = 0; i < smartlist_len(votes); ++i)
tor_free(flag_map[i]);
tor_free(flag_map);
tor_free(flag_counts);
tor_free(named_flag);
tor_free(unnamed_flag);
strmap_free(name_to_id_map, NULL);
smartlist_free(matching_descs);
smartlist_free(chosen_flags);
smartlist_free(versions);
smartlist_free(exitsummaries);
tor_free(bandwidths);
}
/* Add a signature. */
{
char digest[DIGEST_LEN];
char fingerprint[HEX_DIGEST_LEN+1];
char signing_key_fingerprint[HEX_DIGEST_LEN+1];
char buf[4096];
smartlist_add(chunks, tor_strdup("directory-signature "));
/* Compute the hash of the chunks. */
hash_list_members(digest, chunks);
/* Get the fingerprints */
crypto_pk_get_fingerprint(identity_key, fingerprint, 0);
crypto_pk_get_fingerprint(signing_key, signing_key_fingerprint, 0);
/* add the junk that will go at the end of the line. */
tor_snprintf(buf, sizeof(buf), "%s %s\n", fingerprint,
signing_key_fingerprint);
/* And the signature. */
if (router_append_dirobj_signature(buf, sizeof(buf), digest,
signing_key)) {
log_warn(LD_BUG, "Couldn't sign consensus networkstatus.");
return NULL; /* This leaks, but it should never happen. */
}
smartlist_add(chunks, tor_strdup(buf));
if (legacy_id_key_digest && legacy_signing_key && consensus_method >= 3) {
smartlist_add(chunks, tor_strdup("directory-signature "));
base16_encode(fingerprint, sizeof(fingerprint),
legacy_id_key_digest, DIGEST_LEN);
crypto_pk_get_fingerprint(legacy_signing_key,
signing_key_fingerprint, 0);
tor_snprintf(buf, sizeof(buf), "%s %s\n", fingerprint,
signing_key_fingerprint);
if (router_append_dirobj_signature(buf, sizeof(buf), digest,
legacy_signing_key)) {
log_warn(LD_BUG, "Couldn't sign consensus networkstatus.");
return NULL; /* This leaks, but it should never happen. */
}
smartlist_add(chunks, tor_strdup(buf));
}
}
result = smartlist_join_strings(chunks, "", 0, NULL);
tor_free(client_versions);
tor_free(server_versions);
SMARTLIST_FOREACH(flags, char *, cp, tor_free(cp));
smartlist_free(flags);
SMARTLIST_FOREACH(chunks, char *, cp, tor_free(cp));
smartlist_free(chunks);
{
networkstatus_t *c;
if (!(c = networkstatus_parse_vote_from_string(result, NULL,
NS_TYPE_CONSENSUS))) {
log_err(LD_BUG,"Generated a networkstatus consensus we couldn't "
"parse.");
tor_free(result);
return NULL;
}
networkstatus_vote_free(c);
}
return result;
}
/** Given a consensus vote <b>target</b> and a set of detached signatures in
* <b>sigs</b> that correspond to the same consensus, check whether there are
* any new signatures in <b>src_voter_list</b> that should be added to
* <b>target</b>. (A signature should be added if we have no signature for that
* voter in <b>target</b> yet, or if we have no verifiable signature and the
* new signature is verifiable.) Return the number of signatures added or
* changed, or -1 if the document signed by <b>sigs</b> isn't the same
* document as <b>target</b>. */
int
networkstatus_add_detached_signatures(networkstatus_t *target,
ns_detached_signatures_t *sigs,
const char **msg_out)
{
int r = 0;
tor_assert(sigs);
tor_assert(target);
tor_assert(target->type == NS_TYPE_CONSENSUS);
/* Do the times seem right? */
if (target->valid_after != sigs->valid_after) {
*msg_out = "Valid-After times do not match "
"when adding detached signatures to consensus";
return -1;
}
if (target->fresh_until != sigs->fresh_until) {
*msg_out = "Fresh-until times do not match "
"when adding detached signatures to consensus";
return -1;
}
if (target->valid_until != sigs->valid_until) {
*msg_out = "Valid-until times do not match "
"when adding detached signatures to consensus";
return -1;
}
/* Are they the same consensus? */
if (memcmp(target->networkstatus_digest, sigs->networkstatus_digest,
DIGEST_LEN)) {
*msg_out = "Digest mismatch when adding detached signatures to consensus";
return -1;
}
/* For each voter in src... */
SMARTLIST_FOREACH_BEGIN(sigs->signatures, networkstatus_voter_info_t *,
src_voter) {
char voter_identity[HEX_DIGEST_LEN+1];
networkstatus_voter_info_t *target_voter =
networkstatus_get_voter_by_id(target, src_voter->identity_digest);
authority_cert_t *cert = NULL;
base16_encode(voter_identity, sizeof(voter_identity),
src_voter->identity_digest, DIGEST_LEN);
log_info(LD_DIR, "Looking at signature from %s", voter_identity);
/* If the target doesn't know about this voter, then forget it. */
if (!target_voter) {
log_info(LD_DIR, "We do not know about %s", voter_identity);
continue;
}
/* If the target already has a good signature from this voter, then skip
* this one. */
if (target_voter->good_signature) {
log_info(LD_DIR, "We already have a good signature from %s",
voter_identity);
continue;
}
/* Try checking the signature if we haven't already. */
if (!src_voter->good_signature && !src_voter->bad_signature) {
cert = authority_cert_get_by_digests(src_voter->identity_digest,
src_voter->signing_key_digest);
if (cert) {
networkstatus_check_voter_signature(target, src_voter, cert);
}
}
/* If this signature is good, or we don't have any signature yet,
* then add it. */
if (src_voter->good_signature || !target_voter->signature) {
log_info(LD_DIR, "Adding signature from %s", voter_identity);
++r;
tor_free(target_voter->signature);
target_voter->signature =
tor_memdup(src_voter->signature, src_voter->signature_len);
memcpy(target_voter->signing_key_digest, src_voter->signing_key_digest,
DIGEST_LEN);
target_voter->signature_len = src_voter->signature_len;
target_voter->good_signature = src_voter->good_signature;
target_voter->bad_signature = src_voter->bad_signature;
} else {
log_info(LD_DIR, "Not adding signature from %s", voter_identity);
}
} SMARTLIST_FOREACH_END(src_voter);
return r;
}
/** Return a newly allocated string holding the detached-signatures document
* corresponding to the signatures on <b>consensus</b>. */
char *
networkstatus_get_detached_signatures(networkstatus_t *consensus)
{
smartlist_t *elements;
char buf[4096];
char *result = NULL;
int n_sigs = 0;
tor_assert(consensus);
tor_assert(consensus->type == NS_TYPE_CONSENSUS);
elements = smartlist_create();
{
char va_buf[ISO_TIME_LEN+1], fu_buf[ISO_TIME_LEN+1],
vu_buf[ISO_TIME_LEN+1];
char d[HEX_DIGEST_LEN+1];
base16_encode(d, sizeof(d), consensus->networkstatus_digest, DIGEST_LEN);
format_iso_time(va_buf, consensus->valid_after);
format_iso_time(fu_buf, consensus->fresh_until);
format_iso_time(vu_buf, consensus->valid_until);
tor_snprintf(buf, sizeof(buf),
"consensus-digest %s\n"
"valid-after %s\n"
"fresh-until %s\n"
"valid-until %s\n", d, va_buf, fu_buf, vu_buf);
smartlist_add(elements, tor_strdup(buf));
}
SMARTLIST_FOREACH(consensus->voters, networkstatus_voter_info_t *, v,
{
char sk[HEX_DIGEST_LEN+1];
char id[HEX_DIGEST_LEN+1];
if (!v->signature || v->bad_signature)
continue;
++n_sigs;
base16_encode(sk, sizeof(sk), v->signing_key_digest, DIGEST_LEN);
base16_encode(id, sizeof(id), v->identity_digest, DIGEST_LEN);
tor_snprintf(buf, sizeof(buf),
"directory-signature %s %s\n-----BEGIN SIGNATURE-----\n",
id, sk);
smartlist_add(elements, tor_strdup(buf));
base64_encode(buf, sizeof(buf), v->signature, v->signature_len);
strlcat(buf, "-----END SIGNATURE-----\n", sizeof(buf));
smartlist_add(elements, tor_strdup(buf));
});
result = smartlist_join_strings(elements, "", 0, NULL);
SMARTLIST_FOREACH(elements, char *, cp, tor_free(cp));
smartlist_free(elements);
if (!n_sigs)
tor_free(result);
return result;
}
/** Release all storage held in <b>s</b>. */
void
ns_detached_signatures_free(ns_detached_signatures_t *s)
{
if (s->signatures) {
SMARTLIST_FOREACH(s->signatures, networkstatus_voter_info_t *, v,
{
tor_free(v->signature);
tor_free(v);
});
smartlist_free(s->signatures);
}
tor_free(s);
}
/* =====
* Certificate functions
* ===== */
/** Allocate and return a new authority_cert_t with the same contents as
* <b>cert</b>. */
authority_cert_t *
authority_cert_dup(authority_cert_t *cert)
{
authority_cert_t *out = tor_malloc(sizeof(authority_cert_t));
tor_assert(cert);
memcpy(out, cert, sizeof(authority_cert_t));
/* Now copy pointed-to things. */
out->cache_info.signed_descriptor_body =
tor_strndup(cert->cache_info.signed_descriptor_body,
cert->cache_info.signed_descriptor_len);
out->cache_info.saved_location = SAVED_NOWHERE;
out->identity_key = crypto_pk_dup_key(cert->identity_key);
out->signing_key = crypto_pk_dup_key(cert->signing_key);
return out;
}
/* =====
* Vote scheduling
* ===== */
/** Set *<b>timing_out</b> to the intervals at which we would like to vote.
* Note that these aren't the intervals we'll use to vote; they're the ones
* that we'll vote to use. */
void
dirvote_get_preferred_voting_intervals(vote_timing_t *timing_out)
{
or_options_t *options = get_options();
tor_assert(timing_out);
timing_out->vote_interval = options->V3AuthVotingInterval;
timing_out->n_intervals_valid = options->V3AuthNIntervalsValid;
timing_out->vote_delay = options->V3AuthVoteDelay;
timing_out->dist_delay = options->V3AuthDistDelay;
}
/** Return the start of the next interval of size <b>interval</b> (in seconds)
* after <b>now</b>. Midnight always starts a fresh interval, and if the last
* interval of a day would be truncated to less than half its size, it is
* rolled into the previous interval. */
time_t
dirvote_get_start_of_next_interval(time_t now, int interval)
{
struct tm tm;
time_t midnight_today;
time_t midnight_tomorrow;
time_t next;
tor_gmtime_r(&now, &tm);
tm.tm_hour = 0;
tm.tm_min = 0;
tm.tm_sec = 0;
midnight_today = tor_timegm(&tm);
midnight_tomorrow = midnight_today + (24*60*60);
next = midnight_today + ((now-midnight_today)/interval + 1)*interval;
/* Intervals never cross midnight. */
if (next > midnight_tomorrow)
next = midnight_tomorrow;
/* If the interval would only last half as long as it's supposed to, then
* skip over to the next day. */
if (next + interval/2 > midnight_tomorrow)
next = midnight_tomorrow;
return next;
}
/** Scheduling information for a voting interval. */
static struct {
/** When do we generate and distribute our vote for this interval? */
time_t voting_starts;
/** When do we send an HTTP request for any votes that we haven't
* been posted yet?*/
time_t fetch_missing_votes;
/** When do we give up on getting more votes and generate a consensus? */
time_t voting_ends;
/** When do we send an HTTP request for any signatures we're expecting to
* see on the consensus? */
time_t fetch_missing_signatures;
/** When do we publish the consensus? */
time_t interval_starts;
/* True iff we have generated and distributed our vote. */
int have_voted;
/* True iff we've requested missing votes. */
int have_fetched_missing_votes;
/* True iff we have built a consensus and sent the signatures around. */
int have_built_consensus;
/* True iff we've fetched missing signatures. */
int have_fetched_missing_signatures;
/* True iff we have published our consensus. */
int have_published_consensus;
} voting_schedule = {0,0,0,0,0,0,0,0,0,0};
/** Set voting_schedule to hold the timing for the next vote we should be
* doing. */
void
dirvote_recalculate_timing(or_options_t *options, time_t now)
{
int interval, vote_delay, dist_delay;
time_t start;
time_t end;
networkstatus_t *consensus;
if (!authdir_mode_v3(options))
return;
consensus = networkstatus_get_live_consensus(now);
memset(&voting_schedule, 0, sizeof(voting_schedule));
if (consensus) {
interval = (int)( consensus->fresh_until - consensus->valid_after );
vote_delay = consensus->vote_seconds;
dist_delay = consensus->dist_seconds;
} else {
interval = options->TestingV3AuthInitialVotingInterval;
vote_delay = options->TestingV3AuthInitialVoteDelay;
dist_delay = options->TestingV3AuthInitialDistDelay;
}
tor_assert(interval > 0);
if (vote_delay + dist_delay > interval/2)
vote_delay = dist_delay = interval / 4;
start = voting_schedule.interval_starts =
dirvote_get_start_of_next_interval(now,interval);
end = dirvote_get_start_of_next_interval(start+1, interval);
tor_assert(end > start);
voting_schedule.fetch_missing_signatures = start - (dist_delay/2);
voting_schedule.voting_ends = start - dist_delay;
voting_schedule.fetch_missing_votes = start - dist_delay - (vote_delay/2);
voting_schedule.voting_starts = start - dist_delay - vote_delay;
{
char tbuf[ISO_TIME_LEN+1];
format_iso_time(tbuf, voting_schedule.interval_starts);
log_notice(LD_DIR,"Choosing expected valid-after time as %s: "
"consensus_set=%d, interval=%d",
tbuf, consensus?1:0, interval);
}
}
/** Entry point: Take whatever voting actions are pending as of <b>now</b>. */
void
dirvote_act(or_options_t *options, time_t now)
{
if (!authdir_mode_v3(options))
return;
if (!voting_schedule.voting_starts) {
char *keys = list_v3_auth_ids();
authority_cert_t *c = get_my_v3_authority_cert();
log_notice(LD_DIR, "Scheduling voting. Known authority IDs are %s. "
"Mine is %s.",
keys, hex_str(c->cache_info.identity_digest, DIGEST_LEN));
tor_free(keys);
dirvote_recalculate_timing(options, now);
}
if (voting_schedule.voting_starts < now && !voting_schedule.have_voted) {
log_notice(LD_DIR, "Time to vote.");
dirvote_perform_vote();
voting_schedule.have_voted = 1;
}
if (voting_schedule.fetch_missing_votes < now &&
!voting_schedule.have_fetched_missing_votes) {
log_notice(LD_DIR, "Time to fetch any votes that we're missing.");
dirvote_fetch_missing_votes();
voting_schedule.have_fetched_missing_votes = 1;
}
if (voting_schedule.voting_ends < now &&
!voting_schedule.have_built_consensus) {
log_notice(LD_DIR, "Time to compute a consensus.");
dirvote_compute_consensus();
/* XXXX We will want to try again later if we haven't got enough
* votes yet. Implement this if it turns out to ever happen. */
voting_schedule.have_built_consensus = 1;
}
if (voting_schedule.fetch_missing_signatures < now &&
!voting_schedule.have_fetched_missing_signatures) {
log_notice(LD_DIR, "Time to fetch any signatures that we're missing.");
dirvote_fetch_missing_signatures();
voting_schedule.have_fetched_missing_signatures = 1;
}
if (voting_schedule.interval_starts < now &&
!voting_schedule.have_published_consensus) {
log_notice(LD_DIR, "Time to publish the consensus and discard old votes");
dirvote_publish_consensus();
dirvote_clear_votes(0);
voting_schedule.have_published_consensus = 1;
/* XXXX We will want to try again later if we haven't got enough
* signatures yet. Implement this if it turns out to ever happen. */
dirvote_recalculate_timing(options, now);
}
}
/** A vote networkstatus_t and its unparsed body: held around so we can
* use it to generate a consensus (at voting_ends) and so we can serve it to
* other authorities that might want it. */
typedef struct pending_vote_t {
cached_dir_t *vote_body;
networkstatus_t *vote;
} pending_vote_t;
/** List of pending_vote_t for the current vote. Before we've used them to
* build a consensus, the votes go here. */
static smartlist_t *pending_vote_list = NULL;
/** List of pending_vote_t for the previous vote. After we've used them to
* build a consensus, the votes go here for the next period. */
static smartlist_t *previous_vote_list = NULL;
/** The body of the consensus that we're currently building. Once we
* have it built, it goes into dirserv.c */
static char *pending_consensus_body = NULL;
/** The detached signatures for the consensus that we're currently
* building. */
static char *pending_consensus_signatures = NULL;
/** The parsed in-progress consensus document. */
static networkstatus_t *pending_consensus = NULL;
/** List of ns_detached_signatures_t: hold signatures that get posted to us
* before we have generated the consensus on our own. */
static smartlist_t *pending_consensus_signature_list = NULL;
/** Generate a networkstatus vote and post it to all the v3 authorities.
* (V3 Authority only) */
static int
dirvote_perform_vote(void)
{
crypto_pk_env_t *key = get_my_v3_authority_signing_key();
authority_cert_t *cert = get_my_v3_authority_cert();
networkstatus_t *ns;
char *contents;
pending_vote_t *pending_vote;
time_t now = time(NULL);
int status;
const char *msg = "";
if (!cert || !key) {
log_warn(LD_NET, "Didn't find key/certificate to generate v3 vote");
return -1;
} else if (cert->expires < now) {
log_warn(LD_NET, "Can't generate v3 vote with expired certificate");
return -1;
}
if (!(ns = dirserv_generate_networkstatus_vote_obj(key, cert)))
return -1;
contents = format_networkstatus_vote(key, ns);
networkstatus_vote_free(ns);
if (!contents)
return -1;
pending_vote = dirvote_add_vote(contents, &msg, &status);
tor_free(contents);
if (!pending_vote) {
log_warn(LD_DIR, "Couldn't store my own vote! (I told myself, '%s'.)",
msg);
return -1;
}
directory_post_to_dirservers(DIR_PURPOSE_UPLOAD_VOTE,
ROUTER_PURPOSE_GENERAL,
V3_AUTHORITY,
pending_vote->vote_body->dir,
pending_vote->vote_body->dir_len, 0);
log_notice(LD_DIR, "Vote posted.");
return 0;
}
/** Send an HTTP request to every other v3 authority, for the votes of every
* authority for which we haven't received a vote yet in this period. (V3
* authority only) */
static void
dirvote_fetch_missing_votes(void)
{
smartlist_t *missing_fps = smartlist_create();
char *resource;
SMARTLIST_FOREACH(router_get_trusted_dir_servers(),
trusted_dir_server_t *, ds,
{
if (!(ds->type & V3_AUTHORITY))
continue;
if (!dirvote_get_vote(ds->v3_identity_digest,
DGV_BY_ID|DGV_INCLUDE_PENDING)) {
char *cp = tor_malloc(HEX_DIGEST_LEN+1);
base16_encode(cp, HEX_DIGEST_LEN+1, ds->v3_identity_digest,
DIGEST_LEN);
smartlist_add(missing_fps, cp);
}
});
if (!smartlist_len(missing_fps)) {
smartlist_free(missing_fps);
return;
}
log_notice(LOG_NOTICE, "We're missing votes from %d authorities. Asking "
"every other authority for a copy.", smartlist_len(missing_fps));
resource = smartlist_join_strings(missing_fps, "+", 0, NULL);
directory_get_from_all_authorities(DIR_PURPOSE_FETCH_STATUS_VOTE,
0, resource);
tor_free(resource);
SMARTLIST_FOREACH(missing_fps, char *, cp, tor_free(cp));
smartlist_free(missing_fps);
}
/** Send a request to every other authority for its detached signatures,
* unless we have signatures from all other v3 authorities already. */
static void
dirvote_fetch_missing_signatures(void)
{
if (!pending_consensus)
return;
if (networkstatus_check_consensus_signature(pending_consensus, -1) == 1)
return; /* we have a signature from everybody. */
directory_get_from_all_authorities(DIR_PURPOSE_FETCH_DETACHED_SIGNATURES,
0, NULL);
}
/** Drop all currently pending votes, consensus, and detached signatures. */
static void
dirvote_clear_votes(int all_votes)
{
if (!previous_vote_list)
previous_vote_list = smartlist_create();
if (!pending_vote_list)
pending_vote_list = smartlist_create();
/* All "previous" votes are now junk. */
SMARTLIST_FOREACH(previous_vote_list, pending_vote_t *, v, {
cached_dir_decref(v->vote_body);
v->vote_body = NULL;
networkstatus_vote_free(v->vote);
tor_free(v);
});
smartlist_clear(previous_vote_list);
if (all_votes) {
/* If we're dumping all the votes, we delete the pending ones. */
SMARTLIST_FOREACH(pending_vote_list, pending_vote_t *, v, {
cached_dir_decref(v->vote_body);
v->vote_body = NULL;
networkstatus_vote_free(v->vote);
tor_free(v);
});
} else {
/* Otherwise, we move them into "previous". */
smartlist_add_all(previous_vote_list, pending_vote_list);
}
smartlist_clear(pending_vote_list);
if (pending_consensus_signature_list) {
SMARTLIST_FOREACH(pending_consensus_signature_list, char *, cp,
tor_free(cp));
smartlist_clear(pending_consensus_signature_list);
}
tor_free(pending_consensus_body);
tor_free(pending_consensus_signatures);
if (pending_consensus) {
networkstatus_vote_free(pending_consensus);
pending_consensus = NULL;
}
}
/** Return a newly allocated string containing the hex-encoded v3 authority
identity digest of every recognized v3 authority. */
static char *
list_v3_auth_ids(void)
{
smartlist_t *known_v3_keys = smartlist_create();
char *keys;
SMARTLIST_FOREACH(router_get_trusted_dir_servers(),
trusted_dir_server_t *, ds,
if ((ds->type & V3_AUTHORITY) &&
!tor_digest_is_zero(ds->v3_identity_digest))
smartlist_add(known_v3_keys,
tor_strdup(hex_str(ds->v3_identity_digest, DIGEST_LEN))));
keys = smartlist_join_strings(known_v3_keys, ", ", 0, NULL);
SMARTLIST_FOREACH(known_v3_keys, char *, cp, tor_free(cp));
smartlist_free(known_v3_keys);
return keys;
}
/** Called when we have received a networkstatus vote in <b>vote_body</b>.
* Parse and validate it, and on success store it as a pending vote (which we
* then return). Return NULL on failure. Sets *<b>msg_out</b> and
* *<b>status_out</b> to an HTTP response and status code. (V3 authority
* only) */
pending_vote_t *
dirvote_add_vote(const char *vote_body, const char **msg_out, int *status_out)
{
networkstatus_t *vote;
networkstatus_voter_info_t *vi;
trusted_dir_server_t *ds;
pending_vote_t *pending_vote = NULL;
const char *end_of_vote = NULL;
int any_failed = 0;
tor_assert(vote_body);
tor_assert(msg_out);
tor_assert(status_out);
if (!pending_vote_list)
pending_vote_list = smartlist_create();
*status_out = 0;
*msg_out = NULL;
again:
vote = networkstatus_parse_vote_from_string(vote_body, &end_of_vote,
NS_TYPE_VOTE);
if (!end_of_vote)
end_of_vote = vote_body + strlen(vote_body);
if (!vote) {
log_warn(LD_DIR, "Couldn't parse vote: length was %d",
(int)strlen(vote_body));
*msg_out = "Unable to parse vote";
goto err;
}
tor_assert(smartlist_len(vote->voters) == 1);
vi = get_voter(vote);
tor_assert(vi->good_signature == 1);
ds = trusteddirserver_get_by_v3_auth_digest(vi->identity_digest);
if (!ds) {
char *keys = list_v3_auth_ids();
log_warn(LD_DIR, "Got a vote from an authority (nickname %s, address %s) "
"with authority key ID %s. "
"This key ID is not recognized. Known v3 key IDs are: %s",
vi->nickname, vi->address,
hex_str(vi->identity_digest, DIGEST_LEN), keys);
tor_free(keys);
*msg_out = "Vote not from a recognized v3 authority";
goto err;
}
tor_assert(vote->cert);
if (!authority_cert_get_by_digests(vote->cert->cache_info.identity_digest,
vote->cert->signing_key_digest)) {
/* Hey, it's a new cert! */
trusted_dirs_load_certs_from_string(
vote->cert->cache_info.signed_descriptor_body,
0 /* from_store */, 1 /*flush*/);
if (!authority_cert_get_by_digests(vote->cert->cache_info.identity_digest,
vote->cert->signing_key_digest)) {
log_warn(LD_BUG, "We added a cert, but still couldn't find it.");
}
}
/* Is it for the right period? */
if (vote->valid_after != voting_schedule.interval_starts) {
char tbuf1[ISO_TIME_LEN+1], tbuf2[ISO_TIME_LEN+1];
format_iso_time(tbuf1, vote->valid_after);
format_iso_time(tbuf2, voting_schedule.interval_starts);
log_warn(LD_DIR, "Rejecting vote from %s with valid-after time of %s; "
"we were expecting %s", vi->address, tbuf1, tbuf2);
*msg_out = "Bad valid-after time";
goto err;
}
/* Now see whether we already have a vote from this authority. */
SMARTLIST_FOREACH(pending_vote_list, pending_vote_t *, v, {
if (! memcmp(v->vote->cert->cache_info.identity_digest,
vote->cert->cache_info.identity_digest,
DIGEST_LEN)) {
networkstatus_voter_info_t *vi_old = get_voter(v->vote);
if (!memcmp(vi_old->vote_digest, vi->vote_digest, DIGEST_LEN)) {
/* Ah, it's the same vote. Not a problem. */
log_info(LD_DIR, "Discarding a vote we already have.");
if (*status_out < 200)
*status_out = 200;
goto discard;
} else if (v->vote->published < vote->published) {
log_notice(LD_DIR, "Replacing an older pending vote from this "
"directory.");
cached_dir_decref(v->vote_body);
networkstatus_vote_free(v->vote);
v->vote_body = new_cached_dir(tor_strndup(vote_body,
end_of_vote-vote_body),
vote->published);
v->vote = vote;
if (end_of_vote &&
!strcmpstart(end_of_vote, "network-status-version"))
goto again;
if (*status_out < 200)
*status_out = 200;
if (!*msg_out)
*msg_out = "OK";
return v;
} else {
*msg_out = "Already have a newer pending vote";
goto err;
}
}
});
pending_vote = tor_malloc_zero(sizeof(pending_vote_t));
pending_vote->vote_body = new_cached_dir(tor_strndup(vote_body,
end_of_vote-vote_body),
vote->published);
pending_vote->vote = vote;
smartlist_add(pending_vote_list, pending_vote);
if (!strcmpstart(end_of_vote, "network-status-version ")) {
vote_body = end_of_vote;
goto again;
}
goto done;
err:
any_failed = 1;
if (!*msg_out)
*msg_out = "Error adding vote";
if (*status_out < 400)
*status_out = 400;
discard:
if (vote)
networkstatus_vote_free(vote);
if (end_of_vote && !strcmpstart(end_of_vote, "network-status-version ")) {
vote_body = end_of_vote;
goto again;
}
done:
if (*status_out < 200)
*status_out = 200;
if (!*msg_out) {
if (!any_failed && !pending_vote) {
*msg_out = "Duplicate discarded";
} else {
*msg_out = "ok";
}
}
return any_failed ? NULL : pending_vote;
}
/** Try to compute a v3 networkstatus consensus from the currently pending
* votes. Return 0 on success, -1 on failure. Store the consensus in
* pending_consensus: it won't be ready to be published until we have
* everybody else's signatures collected too. (V3 Authority only) */
static int
dirvote_compute_consensus(void)
{
/* Have we got enough votes to try? */
int n_votes, n_voters;
smartlist_t *votes = NULL, *votestrings = NULL;
char *consensus_body = NULL, *signatures = NULL, *votefile;
networkstatus_t *consensus = NULL;
authority_cert_t *my_cert;
if (!pending_vote_list)
pending_vote_list = smartlist_create();
n_voters = get_n_authorities(V3_AUTHORITY);
n_votes = smartlist_len(pending_vote_list);
if (n_votes <= n_voters/2) {
log_warn(LD_DIR, "We don't have enough votes to generate a consensus: "
"%d of %d", n_votes, n_voters/2);
goto err;
}
if (!(my_cert = get_my_v3_authority_cert())) {
log_warn(LD_DIR, "Can't generate consensus without a certificate.");
goto err;
}
votes = smartlist_create();
votestrings = smartlist_create();
SMARTLIST_FOREACH(pending_vote_list, pending_vote_t *, v,
{
sized_chunk_t *c = tor_malloc(sizeof(sized_chunk_t));
c->bytes = v->vote_body->dir;
c->len = v->vote_body->dir_len;
smartlist_add(votestrings, c); /* collect strings to write to disk */
smartlist_add(votes, v->vote); /* collect votes to compute consensus */
});
votefile = get_datadir_fname("v3-status-votes");
write_chunks_to_file(votefile, votestrings, 0);
tor_free(votefile);
SMARTLIST_FOREACH(votestrings, sized_chunk_t *, c, tor_free(c));
smartlist_free(votestrings);
{
char legacy_dbuf[DIGEST_LEN];
crypto_pk_env_t *legacy_sign=NULL;
char *legacy_id_digest = NULL;
if (get_options()->V3AuthUseLegacyKey) {
authority_cert_t *cert = get_my_v3_legacy_cert();
legacy_sign = get_my_v3_legacy_signing_key();
if (cert) {
crypto_pk_get_digest(cert->identity_key, legacy_dbuf);
legacy_id_digest = legacy_dbuf;
}
}
consensus_body = networkstatus_compute_consensus(
votes, n_voters,
my_cert->identity_key,
get_my_v3_authority_signing_key(), legacy_id_digest, legacy_sign);
}
if (!consensus_body) {
log_warn(LD_DIR, "Couldn't generate a consensus at all!");
goto err;
}
consensus = networkstatus_parse_vote_from_string(consensus_body, NULL,
NS_TYPE_CONSENSUS);
if (!consensus) {
log_warn(LD_DIR, "Couldn't parse consensus we generated!");
goto err;
}
/* 'Check' our own signature, to mark it valid. */
networkstatus_check_consensus_signature(consensus, -1);
signatures = networkstatus_get_detached_signatures(consensus);
if (!signatures) {
log_warn(LD_DIR, "Couldn't extract signatures.");
goto err;
}
tor_free(pending_consensus_body);
pending_consensus_body = consensus_body;
tor_free(pending_consensus_signatures);
pending_consensus_signatures = signatures;
if (pending_consensus)
networkstatus_vote_free(pending_consensus);
pending_consensus = consensus;
if (pending_consensus_signature_list) {
int n_sigs = 0;
/* we may have gotten signatures for this consensus before we built
* it ourself. Add them now. */
SMARTLIST_FOREACH(pending_consensus_signature_list, char *, sig,
{
const char *msg = NULL;
int r = dirvote_add_signatures_to_pending_consensus(sig, &msg);
if (r >= 0)
n_sigs += r;
else
log_warn(LD_DIR,
"Could not add queued signature to new consensus: %s",
msg);
tor_free(sig);
});
if (n_sigs)
log_notice(LD_DIR, "Added %d pending signatures while building "
"consensus.", n_sigs);
smartlist_clear(pending_consensus_signature_list);
}
log_notice(LD_DIR, "Consensus computed; uploading signature(s)");
directory_post_to_dirservers(DIR_PURPOSE_UPLOAD_SIGNATURES,
ROUTER_PURPOSE_GENERAL,
V3_AUTHORITY,
pending_consensus_signatures,
strlen(pending_consensus_signatures), 0);
log_notice(LD_DIR, "Signature(s) posted.");
return 0;
err:
if (votes)
smartlist_free(votes);
tor_free(consensus_body);
tor_free(signatures);
networkstatus_vote_free(consensus);
return -1;
}
/** Helper: we just got the <b>detached_signatures_body</b> sent to us as
* signatures on the currently pending consensus. Add them to the consensus
* as appropriate. Return the number of signatures added. (?) */
static int
dirvote_add_signatures_to_pending_consensus(
const char *detached_signatures_body,
const char **msg_out)
{
ns_detached_signatures_t *sigs = NULL;
int r = -1;
tor_assert(detached_signatures_body);
tor_assert(msg_out);
/* Only call if we have a pending consensus right now. */
tor_assert(pending_consensus);
tor_assert(pending_consensus_body);
tor_assert(pending_consensus_signatures);
*msg_out = NULL;
if (!(sigs = networkstatus_parse_detached_signatures(
detached_signatures_body, NULL))) {
*msg_out = "Couldn't parse detached signatures.";
goto err;
}
log_info(LD_DIR, "Have %d signatures for adding to consensus.",
smartlist_len(sigs->signatures));
r = networkstatus_add_detached_signatures(pending_consensus,
sigs, msg_out);
log_info(LD_DIR,"Added %d signatures to consensus.", r);
if (r >= 1) {
char *new_detached =
networkstatus_get_detached_signatures(pending_consensus);
const char *src;
char *dst, *dst_end;
size_t new_consensus_len;
if (!new_detached) {
*msg_out = "No signatures to add";
goto err;
}
new_consensus_len =
strlen(pending_consensus_body) + strlen(new_detached) + 1;
pending_consensus_body = tor_realloc(pending_consensus_body,
new_consensus_len);
dst_end = pending_consensus_body + new_consensus_len;
dst = strstr(pending_consensus_body, "directory-signature ");
tor_assert(dst);
src = strstr(new_detached, "directory-signature ");
tor_assert(src);
strlcpy(dst, src, dst_end-dst);
/* We remove this block once it has failed to crash for a while. But
* unless it shows up in profiles, we're probably better leaving it in,
* just in case we break detached signature processing at some point. */
{
ns_detached_signatures_t *sigs =
networkstatus_parse_detached_signatures(new_detached, NULL);
networkstatus_t *v = networkstatus_parse_vote_from_string(
pending_consensus_body, NULL,
NS_TYPE_CONSENSUS);
tor_assert(sigs);
ns_detached_signatures_free(sigs);
tor_assert(v);
networkstatus_vote_free(v);
}
tor_free(pending_consensus_signatures);
pending_consensus_signatures = new_detached;
*msg_out = "Signatures added";
} else if (r == 0) {
*msg_out = "Signatures ignored";
} else {
goto err;
}
goto done;
err:
if (!*msg_out)
*msg_out = "Unrecognized error while adding detached signatures.";
done:
if (sigs)
ns_detached_signatures_free(sigs);
return r;
}
/** Helper: we just got the <b>deteached_signatures_body</b> sent to us as
* signatures on the currently pending consensus. Add them to the pending
* consensus (if we have one); otherwise queue them until we have a
* consensus. Return negative on failure, nonnegative on success. */
int
dirvote_add_signatures(const char *detached_signatures_body,
const char *source,
const char **msg)
{
if (pending_consensus) {
log_notice(LD_DIR, "Got a signature from %s. "
"Adding it to the pending consensus.", source);
return dirvote_add_signatures_to_pending_consensus(
detached_signatures_body, msg);
} else {
log_notice(LD_DIR, "Got a signature from %s. "
"Queueing it for the next consensus.", source);
if (!pending_consensus_signature_list)
pending_consensus_signature_list = smartlist_create();
smartlist_add(pending_consensus_signature_list,
tor_strdup(detached_signatures_body));
*msg = "Signature queued";
return 0;
}
}
/** Replace the consensus that we're currently serving with the one that we've
* been building. (V3 Authority only) */
static int
dirvote_publish_consensus(void)
{
/* Can we actually publish it yet? */
if (!pending_consensus ||
networkstatus_check_consensus_signature(pending_consensus, 1)<0) {
log_warn(LD_DIR, "Not enough info to publish pending consensus");
return -1;
}
if (networkstatus_set_current_consensus(pending_consensus_body, 0))
log_warn(LD_DIR, "Error publishing consensus");
else
log_notice(LD_DIR, "Consensus published.");
return 0;
}
/** Release all static storage held in dirvote.c */
void
dirvote_free_all(void)
{
dirvote_clear_votes(1);
/* now empty as a result of clear_pending_votes. */
smartlist_free(pending_vote_list);
pending_vote_list = NULL;
smartlist_free(previous_vote_list);
previous_vote_list = NULL;
tor_free(pending_consensus_body);
tor_free(pending_consensus_signatures);
if (pending_consensus) {
networkstatus_vote_free(pending_consensus);
pending_consensus = NULL;
}
if (pending_consensus_signature_list) {
/* now empty as a result of clear_pending_votes. */
smartlist_free(pending_consensus_signature_list);
pending_consensus_signature_list = NULL;
}
}
/* ====
* Access to pending items.
* ==== */
/** Return the body of the consensus that we're currently trying to build. */
const char *
dirvote_get_pending_consensus(void)
{
return pending_consensus_body;
}
/** Return the signatures that we know for the consensus that we're currently
* trying to build */
const char *
dirvote_get_pending_detached_signatures(void)
{
return pending_consensus_signatures;
}
/** Return a given vote specified by <b>fp</b>. If <b>by_id</b>, return the
* vote for the authority with the v3 authority identity key digest <b>fp</b>;
* if <b>by_id</b> is false, return the vote whose digest is <b>fp</b>. If
* <b>fp</b> is NULL, return our own vote. If <b>include_previous</b> is
* false, do not consider any votes for a consensus that's already been built.
* If <b>include_pending</b> is false, do not consider any votes for the
* consensus that's in progress. May return NULL if we have no vote for the
* authority in question. */
const cached_dir_t *
dirvote_get_vote(const char *fp, int flags)
{
int by_id = flags & DGV_BY_ID;
const int include_pending = flags & DGV_INCLUDE_PENDING;
const int include_previous = flags & DGV_INCLUDE_PREVIOUS;
if (!pending_vote_list && !previous_vote_list)
return NULL;
if (fp == NULL) {
authority_cert_t *c = get_my_v3_authority_cert();
if (c) {
fp = c->cache_info.identity_digest;
by_id = 1;
} else
return NULL;
}
if (by_id) {
if (pending_vote_list && include_pending) {
SMARTLIST_FOREACH(pending_vote_list, pending_vote_t *, pv,
if (!memcmp(get_voter(pv->vote)->identity_digest, fp, DIGEST_LEN))
return pv->vote_body);
}
if (previous_vote_list && include_previous) {
SMARTLIST_FOREACH(previous_vote_list, pending_vote_t *, pv,
if (!memcmp(get_voter(pv->vote)->identity_digest, fp, DIGEST_LEN))
return pv->vote_body);
}
} else {
if (pending_vote_list && include_pending) {
SMARTLIST_FOREACH(pending_vote_list, pending_vote_t *, pv,
if (!memcmp(pv->vote->networkstatus_digest, fp, DIGEST_LEN))
return pv->vote_body);
}
if (previous_vote_list && include_previous) {
SMARTLIST_FOREACH(previous_vote_list, pending_vote_t *, pv,
if (!memcmp(pv->vote->networkstatus_digest, fp, DIGEST_LEN))
return pv->vote_body);
}
}
return NULL;
}