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Merge branch 'microdesc_dl_v2'

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This commit is contained in:
Nick Mathewson 2010-09-28 00:46:01 -04:00
commit d6e255edbd
14 changed files with 672 additions and 144 deletions
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4
changes/microdesc_dl Normal file
View File

@ -0,0 +1,4 @@
o Major features:
- Caches now download and cache all the consensus flavors that
they know about. This allows them to assess which microdescriptors
they need to fetch.

27
src/or/connection.c
View File

@ -3397,6 +3397,33 @@ connection_get_by_type_state_rendquery(int type, int state,
return NULL;
}
/** Return a directory connection (if any one exists) that is fetching
* the item described by <b>state</b>/<b>resource</b> */
dir_connection_t *
connection_dir_get_by_purpose_and_resource(int purpose,
const char *resource)
{
smartlist_t *conns = get_connection_array();
SMARTLIST_FOREACH_BEGIN(conns, connection_t *, conn) {
dir_connection_t *dirconn;
if (conn->type != CONN_TYPE_DIR || conn->marked_for_close ||
conn->purpose != purpose)
continue;
dirconn = TO_DIR_CONN(conn);
if (dirconn->requested_resource == NULL) {
if (resource == NULL)
return dirconn;
} else if (resource) {
if (0 == strcmp(resource, dirconn->requested_resource))
return dirconn;
}
} SMARTLIST_FOREACH_END(conn);
return NULL;
}
/** Return an open, non-marked connection of a given type and purpose, or NULL
* if no such connection exists. */
connection_t *

2
src/or/connection.h
View File

@ -124,6 +124,8 @@ connection_t *connection_get_by_type_addr_port_purpose(int type,
connection_t *connection_get_by_type_state(int type, int state);
connection_t *connection_get_by_type_state_rendquery(int type, int state,
const char *rendquery);
dir_connection_t *connection_dir_get_by_purpose_and_resource(
int state, const char *resource);
#define connection_speaks_cells(conn) ((conn)->type == CONN_TYPE_OR)
int connection_is_listener(connection_t *conn);

165
src/or/directory.c
View File

@ -15,6 +15,7 @@
#include "dirvote.h"
#include "geoip.h"
#include "main.h"
#include "microdesc.h"
#include "networkstatus.h"
#include "policies.h"
#include "rendclient.h"
@ -78,6 +79,8 @@ static void dir_routerdesc_download_failed(smartlist_t *failed,
int router_purpose,
int was_extrainfo,
int was_descriptor_digests);
static void dir_microdesc_download_failed(smartlist_t *failed,
int status_code);
static void note_client_request(int purpose, int compressed, size_t bytes);
static int client_likes_consensus(networkstatus_t *v, const char *want_url);
@ -137,7 +140,8 @@ purpose_needs_anonymity(uint8_t dir_purpose, uint8_t router_purpose)
dir_purpose == DIR_PURPOSE_FETCH_CONSENSUS ||
dir_purpose == DIR_PURPOSE_FETCH_CERTIFICATE ||
dir_purpose == DIR_PURPOSE_FETCH_SERVERDESC ||
dir_purpose == DIR_PURPOSE_FETCH_EXTRAINFO)
dir_purpose == DIR_PURPOSE_FETCH_EXTRAINFO ||
dir_purpose == DIR_PURPOSE_FETCH_MICRODESC)
return 0;
return 1;
}
@ -201,6 +205,8 @@ dir_conn_purpose_to_string(int purpose)
return "hidden-service v2 descriptor fetch";
case DIR_PURPOSE_UPLOAD_RENDDESC_V2:
return "hidden-service v2 descriptor upload";
case DIR_PURPOSE_FETCH_MICRODESC:
return "microdescriptor fetch";
}
log_warn(LD_BUG, "Called with unknown purpose %d", purpose);
@ -355,15 +361,33 @@ directory_get_from_dirserver(uint8_t dir_purpose, uint8_t router_purpose,
case DIR_PURPOSE_FETCH_CERTIFICATE:
type = V3_AUTHORITY;
break;
case DIR_PURPOSE_FETCH_MICRODESC:
type = V3_AUTHORITY;
break;
default:
log_warn(LD_BUG, "Unexpected purpose %d", (int)dir_purpose);
return;
}
if (dir_purpose == DIR_PURPOSE_FETCH_CONSENSUS) {
networkstatus_t *v = networkstatus_get_latest_consensus();
int flav = FLAV_NS;
networkstatus_t *v;
if (resource)
flav = networkstatus_parse_flavor_name(resource);
if (flav != -1) {
/* IF we have a parsed consensus of this type, we can do an
* if-modified-time based on it. */
v = networkstatus_get_latest_consensus_by_flavor(flav);
if (v)
if_modified_since = v->valid_after + 180;
} else {
/* Otherwise it might be a consensus we don't parse, but which we
* do cache. Look at the cached copy, perhaps. */
cached_dir_t *cd = dirserv_get_consensus(resource ? resource : "ns");
if (cd)
if_modified_since = cd->published + 180;
}
}
if (!options->FetchServerDescriptors && type != HIDSERV_AUTHORITY)
@ -395,7 +419,8 @@ directory_get_from_dirserver(uint8_t dir_purpose, uint8_t router_purpose,
if (prefer_authority || type == BRIDGE_AUTHORITY) {
/* only ask authdirservers, and don't ask myself */
rs = router_pick_trusteddirserver(type, pds_flags);
if (rs == NULL && (pds_flags & PDS_NO_EXISTING_SERVERDESC_FETCH)) {
if (rs == NULL && (pds_flags & (PDS_NO_EXISTING_SERVERDESC_FETCH|
PDS_NO_EXISTING_MICRODESC_FETCH))) {
/* We don't want to fetch from any authorities that we're currently
* fetching server descriptors from, and we got no match. Did we
* get no match because all the authorities have connections
@ -403,7 +428,8 @@ directory_get_from_dirserver(uint8_t dir_purpose, uint8_t router_purpose,
* return,) or because all the authorities are down or on fire or
* unreachable or something (in which case we should go on with
* our fallback code)? */
pds_flags &= ~PDS_NO_EXISTING_SERVERDESC_FETCH;
pds_flags &= ~(PDS_NO_EXISTING_SERVERDESC_FETCH|
PDS_NO_EXISTING_MICRODESC_FETCH);
rs = router_pick_trusteddirserver(type, pds_flags);
if (rs) {
log_debug(LD_DIR, "Deferring serverdesc fetch: all authorities "
@ -592,15 +618,19 @@ connection_dir_request_failed(dir_connection_t *conn)
connection_dir_download_networkstatus_failed(conn, -1);
} else if (conn->_base.purpose == DIR_PURPOSE_FETCH_SERVERDESC ||
conn->_base.purpose == DIR_PURPOSE_FETCH_EXTRAINFO) {
log_info(LD_DIR, "Giving up on directory server at '%s'; retrying",
log_info(LD_DIR, "Giving up on serverdesc/extrainfo fetch from "
"directory server at '%s'; retrying",
conn->_base.address);
if (conn->router_purpose == ROUTER_PURPOSE_BRIDGE)
connection_dir_bridge_routerdesc_failed(conn);
connection_dir_download_routerdesc_failed(conn);
} else if (conn->_base.purpose == DIR_PURPOSE_FETCH_CONSENSUS) {
networkstatus_consensus_download_failed(0);
const char *flavname =
conn->requested_resource ? conn->requested_resource : "ns";
networkstatus_consensus_download_failed(0, flavname);
} else if (conn->_base.purpose == DIR_PURPOSE_FETCH_CERTIFICATE) {
log_info(LD_DIR, "Giving up on directory server at '%s'; retrying",
log_info(LD_DIR, "Giving up on certificate fetch from directory server "
"at '%s'; retrying",
conn->_base.address);
connection_dir_download_cert_failed(conn, 0);
} else if (conn->_base.purpose == DIR_PURPOSE_FETCH_DETACHED_SIGNATURES) {
@ -609,6 +639,10 @@ connection_dir_request_failed(dir_connection_t *conn)
} else if (conn->_base.purpose == DIR_PURPOSE_FETCH_STATUS_VOTE) {
log_info(LD_DIR, "Giving up downloading votes from '%s'",
conn->_base.address);
} else if (conn->_base.purpose == DIR_PURPOSE_FETCH_MICRODESC) {
log_info(LD_DIR, "Giving up on downloading microdescriptors from "
" directory server at '%s'; will retry", conn->_base.address);
connection_dir_download_routerdesc_failed(conn);
}
}
@ -679,7 +713,8 @@ connection_dir_download_routerdesc_failed(dir_connection_t *conn)
/* No need to relaunch descriptor downloads here: we already do it
* every 10 or 60 seconds (FOO_DESCRIPTOR_RETRY_INTERVAL) in main.c. */
tor_assert(conn->_base.purpose == DIR_PURPOSE_FETCH_SERVERDESC ||
conn->_base.purpose == DIR_PURPOSE_FETCH_EXTRAINFO);
conn->_base.purpose == DIR_PURPOSE_FETCH_EXTRAINFO ||
conn->_base.purpose == DIR_PURPOSE_FETCH_MICRODESC);
(void) conn;
}
@ -955,12 +990,16 @@ _compare_strs(const void **a, const void **b)
* This url depends on whether or not the server we go to
* is sufficiently new to support conditional consensus downloading,
* i.e. GET .../consensus/<b>fpr</b>+<b>fpr</b>+<b>fpr</b>
*
* If 'resource' is provided, it is the name of a consensus flavor to request.
*/
static char *
directory_get_consensus_url(int supports_conditional_consensus)
directory_get_consensus_url(int supports_conditional_consensus,
const char *resource)
{
char *url;
size_t len;
char *url = NULL;
const char *hyphen = resource ? "-" : "";
const char *flavor = resource ? resource : "";
if (supports_conditional_consensus) {
char *authority_id_list;
@ -982,16 +1021,15 @@ directory_get_consensus_url(int supports_conditional_consensus)
authority_id_list = smartlist_join_strings(authority_digests,
"+", 0, NULL);
len = strlen(authority_id_list)+64;
url = tor_malloc(len);
tor_snprintf(url, len, "/tor/status-vote/current/consensus/%s.z",
authority_id_list);
tor_asprintf(&url, "/tor/status-vote/current/consensus%s%s/%s.z",
hyphen, flavor, authority_id_list);
SMARTLIST_FOREACH(authority_digests, char *, cp, tor_free(cp));
smartlist_free(authority_digests);
tor_free(authority_id_list);
} else {
url = tor_strdup("/tor/status-vote/current/consensus.z");
tor_asprintf(&url, "/tor/status-vote/current/consensus%s%s.z",
hyphen, flavor);
}
return url;
}
@ -1072,10 +1110,11 @@ directory_send_command(dir_connection_t *conn,
tor_snprintf(url, len, "/tor/status/%s", resource);
break;
case DIR_PURPOSE_FETCH_CONSENSUS:
tor_assert(!resource);
/* resource is optional. If present, it's a flavor name */
tor_assert(!payload);
httpcommand = "GET";
url = directory_get_consensus_url(supports_conditional_consensus);
url = directory_get_consensus_url(supports_conditional_consensus,
resource);
log_info(LD_DIR, "Downloading consensus from %s using %s",
hoststring, url);
break;
@ -1115,6 +1154,11 @@ directory_send_command(dir_connection_t *conn,
url = tor_malloc(len);
tor_snprintf(url, len, "/tor/extra/%s", resource);
break;
case DIR_PURPOSE_FETCH_MICRODESC:
tor_assert(resource);
httpcommand = "GET";
tor_asprintf(&url, "/tor/micro/%s.z", resource);
break;
case DIR_PURPOSE_UPLOAD_DIR:
tor_assert(!resource);
tor_assert(payload);
@ -1390,6 +1434,9 @@ body_is_plausible(const char *body, size_t len, int purpose)
return 1; /* empty bodies don't need decompression */
if (len < 32)
return 0;
if (purpose == DIR_PURPOSE_FETCH_MICRODESC) {
return (!strcmpstart(body,"onion-key"));
}
if (purpose != DIR_PURPOSE_FETCH_RENDDESC) {
if (!strcmpstart(body,"router") ||
!strcmpstart(body,"signed-directory") ||
@ -1466,7 +1513,8 @@ connection_dir_client_reached_eof(dir_connection_t *conn)
int plausible;
int skewed=0;
int allow_partial = (conn->_base.purpose == DIR_PURPOSE_FETCH_SERVERDESC ||
conn->_base.purpose == DIR_PURPOSE_FETCH_EXTRAINFO);
conn->_base.purpose == DIR_PURPOSE_FETCH_EXTRAINFO ||
conn->_base.purpose == DIR_PURPOSE_FETCH_MICRODESC);
int was_compressed=0;
time_t now = time(NULL);
@ -1690,6 +1738,8 @@ connection_dir_client_reached_eof(dir_connection_t *conn)
if (conn->_base.purpose == DIR_PURPOSE_FETCH_CONSENSUS) {
int r;
const char *flavname =
conn->requested_resource ? conn->requested_resource : "ns";
if (status_code != 200) {
int severity = (status_code == 304) ? LOG_INFO : LOG_WARN;
log(severity, LD_DIR,
@ -1698,22 +1748,24 @@ connection_dir_client_reached_eof(dir_connection_t *conn)
status_code, escaped(reason), conn->_base.address,
conn->_base.port);
tor_free(body); tor_free(headers); tor_free(reason);
networkstatus_consensus_download_failed(status_code);
networkstatus_consensus_download_failed(status_code, flavname);
return -1;
}
log_info(LD_DIR,"Received consensus directory (size %d) from server "
"'%s:%d'", (int)body_len, conn->_base.address, conn->_base.port);
if ((r=networkstatus_set_current_consensus(body, "ns", 0))<0) {
if ((r=networkstatus_set_current_consensus(body, flavname, 0))<0) {
log_fn(r<-1?LOG_WARN:LOG_INFO, LD_DIR,
"Unable to load consensus directory downloaded from "
"Unable to load %s consensus directory downloaded from "
"server '%s:%d'. I'll try again soon.",
conn->_base.address, conn->_base.port);
flavname, conn->_base.address, conn->_base.port);
tor_free(body); tor_free(headers); tor_free(reason);
networkstatus_consensus_download_failed(0);
networkstatus_consensus_download_failed(0, flavname);
return -1;
}
/* launches router downloads as needed */
routers_update_all_from_networkstatus(now, 3);
update_microdescs_from_networkstatus(now);
update_microdesc_downloads(now);
directory_info_has_arrived(now, 0);
log_info(LD_DIR, "Successfully loaded consensus.");
}
@ -1863,6 +1915,41 @@ connection_dir_client_reached_eof(dir_connection_t *conn)
if (directory_conn_is_self_reachability_test(conn))
router_dirport_found_reachable();
}
if (conn->_base.purpose == DIR_PURPOSE_FETCH_MICRODESC) {
smartlist_t *which = NULL;
log_info(LD_DIR,"Received answer to microdescriptor request (status %d, "
"size %d) from server '%s:%d'",
status_code, (int)body_len, conn->_base.address, conn->_base.port);
tor_assert(conn->requested_resource &&
!strcmpstart(conn->requested_resource, "d/"));
which = smartlist_create();
dir_split_resource_into_fingerprints(conn->requested_resource+2,
which, NULL,
DSR_DIGEST256|DSR_BASE64);
if (status_code != 200) {
log_info(LD_DIR, "Received status code %d (%s) from server "
"'%s:%d' while fetching \"/tor/micro/%s\". I'll try again "
"soon.",
status_code, escaped(reason), conn->_base.address,
(int)conn->_base.port, conn->requested_resource);
dir_microdesc_download_failed(which, status_code);
SMARTLIST_FOREACH(which, char *, cp, tor_free(cp));
smartlist_free(which);
tor_free(body); tor_free(headers); tor_free(reason);
return 0;
} else {
smartlist_t *mds;
mds = microdescs_add_to_cache(get_microdesc_cache(),
body, body+body_len, SAVED_NOWHERE, 0,
now, which);
if (smartlist_len(which)) {
/* Mark remaining ones as failed. */
dir_microdesc_download_failed(which, status_code);
}
SMARTLIST_FOREACH(which, char *, cp, tor_free(cp));
smartlist_free(which);
}
}
if (conn->_base.purpose == DIR_PURPOSE_UPLOAD_DIR) {
switch (status_code) {
@ -3589,6 +3676,36 @@ dir_routerdesc_download_failed(smartlist_t *failed, int status_code,
* every 10 or 60 seconds (FOO_DESCRIPTOR_RETRY_INTERVAL) in main.c. */
}
/* DOCDOC NM */
static void
dir_microdesc_download_failed(smartlist_t *failed,
int status_code)
{
networkstatus_t *consensus
= networkstatus_get_latest_consensus_by_flavor(FLAV_MICRODESC);
routerstatus_t *rs;
download_status_t *dls;
time_t now = time(NULL);
int server = directory_fetches_from_authorities(get_options());
if (! consensus)
return;
SMARTLIST_FOREACH_BEGIN(failed, const char *, d) {
rs = router_get_consensus_status_by_descriptor_digest(consensus, d);
if (!rs)
continue;
dls = &rs->dl_status;
if (dls->n_download_failures >= MAX_MICRODESC_DOWNLOAD_FAILURES)
continue;
{
char buf[BASE64_DIGEST256_LEN+1];
digest256_to_base64(buf, d);
download_status_increment_failure(dls, status_code, buf,
server, now);
}
} SMARTLIST_FOREACH_END(d);
}
/** Helper. Compare two fp_pair_t objects, and return -1, 0, or 1 as
* appropriate. */
static int

3
src/or/dirserv.c
View File

@ -1263,7 +1263,8 @@ static cached_dir_t cached_runningrouters;
* cached_dir_t. */
static digestmap_t *cached_v2_networkstatus = NULL;
/** Map from flavor name to the v3 consensuses that we're currently serving. */
/** Map from flavor name to the cached_dir_t for the v3 consensuses that we're
* currently serving. */
static strmap_t *cached_consensuses = NULL;
/** Possibly replace the contents of <b>d</b> with the value of

6
src/or/main.c
View File

@ -851,10 +851,13 @@ directory_info_has_arrived(time_t now, int from_cache)
"I learned some more directory information, but not enough to "
"build a circuit: %s", get_dir_info_status_string());
update_router_descriptor_downloads(now);
update_microdesc_downloads(now);
return;
} else {
if (directory_fetches_from_authorities(options))
if (directory_fetches_from_authorities(options)) {
update_router_descriptor_downloads(now);
update_microdesc_downloads(now);
}
/* if we have enough dir info, then update our guard status with
* whatever we just learned. */
@ -1062,6 +1065,7 @@ run_scheduled_events(time_t now)
if (time_to_try_getting_descriptors < now) {
update_router_descriptor_downloads(now);
update_extrainfo_downloads(now);
update_microdesc_downloads(now);
if (options->UseBridges)
fetch_bridge_descriptors(now);
if (router_have_minimum_dir_info())

188
src/or/microdesc.c
View File

@ -3,8 +3,12 @@
#include "or.h"
#include "config.h"
#include "directory.h"
#include "microdesc.h"
#include "routerparse.h"
#include "networkstatus.h"
#include "routerlist.h"
#include "dirserv.h"
/** A data structure to hold a bunch of cached microdescriptors. There are
* two active files in the cache: a "cache file" that we mmap, and a "journal
@ -23,6 +27,8 @@ struct microdesc_cache_t {
tor_mmap_t *cache_content;
/** Number of bytes used in the journal file. */
size_t journal_len;
/** Number of bytes in descriptors removed as too old. */
size_t bytes_dropped;
/** Total bytes of microdescriptor bodies we have added to this cache */
uint64_t total_len_seen;
@ -119,15 +125,19 @@ get_microdesc_cache(void)
* ending at <b>eos</b>, and store them in <b>cache</b>. If <b>no-save</b>,
* mark them as non-writable to disk. If <b>where</b> is SAVED_IN_CACHE,
* leave their bodies as pointers to the mmap'd cache. If where is
* <b>SAVED_NOWHERE</b>, do not allow annotations. Return a list of the added
* microdescriptors. */
* <b>SAVED_NOWHERE</b>, do not allow annotations. If listed_at is positive,
* set the last_listed field of every microdesc to listed_at. If
* requested_digests is non-null, then it contains a list of digests we mean
* to allow, so we should reject any non-requested microdesc with a different
* digest, and alter the list to contain only the digests of those microdescs we
* didn't find.
* Return a list of the added microdescriptors. */
smartlist_t *
microdescs_add_to_cache(microdesc_cache_t *cache,
const char *s, const char *eos, saved_location_t where,
int no_save)
int no_save, time_t listed_at,
smartlist_t *requested_digests256)
{
/*XXXX need an argument that sets last_listed as appropriate. */
smartlist_t *descriptors, *added;
const int allow_annotations = (where != SAVED_NOWHERE);
const int copy_body = (where != SAVED_IN_CACHE);
@ -135,6 +145,33 @@ microdescs_add_to_cache(microdesc_cache_t *cache,
descriptors = microdescs_parse_from_string(s, eos,
allow_annotations,
copy_body);
if (listed_at > 0) {
SMARTLIST_FOREACH(descriptors, microdesc_t *, md,
md->last_listed = listed_at);
}
if (requested_digests256) {
digestmap_t *requested; /* XXXX actuqlly we should just use a
digest256map */
requested = digestmap_new();
SMARTLIST_FOREACH(requested_digests256, const char *, cp,
digestmap_set(requested, cp, (void*)1));
SMARTLIST_FOREACH_BEGIN(descriptors, microdesc_t *, md) {
if (digestmap_get(requested, md->digest)) {
digestmap_set(requested, md->digest, (void*)2);
} else {
log_fn(LOG_PROTOCOL_WARN, LD_DIR, "Received non-requested microcdesc");
microdesc_free(md);
SMARTLIST_DEL_CURRENT(descriptors, md);
}
} SMARTLIST_FOREACH_END(md);
SMARTLIST_FOREACH_BEGIN(requested_digests256, char *, cp) {
if (digestmap_get(requested, cp) == (void*)2) {
tor_free(cp);
SMARTLIST_DEL_CURRENT(requested_digests256, cp);
}
} SMARTLIST_FOREACH_END(cp);
digestmap_free(requested, NULL);
}
added = microdescs_add_list_to_cache(cache, descriptors, where, no_save);
smartlist_free(descriptors);
@ -207,11 +244,10 @@ microdescs_add_list_to_cache(microdesc_cache_t *cache,
{
size_t old_content_len =
cache->cache_content ? cache->cache_content->size : 0;
if (cache->journal_len > 16384 + old_content_len &&
cache->journal_len > old_content_len * 2) {
if ((cache->journal_len > 16384 + old_content_len &&
cache->journal_len > old_content_len / 2))
microdesc_cache_rebuild(cache);
}
}
return added;
}
@ -251,7 +287,7 @@ microdesc_cache_reload(microdesc_cache_t *cache)
mm = cache->cache_content = tor_mmap_file(cache->cache_fname);
if (mm) {
added = microdescs_add_to_cache(cache, mm->data, mm->data+mm->size,
SAVED_IN_CACHE, 0);
SAVED_IN_CACHE, 0, -1, NULL);
if (added) {
total += smartlist_len(added);
smartlist_free(added);
@ -263,7 +299,7 @@ microdesc_cache_reload(microdesc_cache_t *cache)
if (journal_content) {
added = microdescs_add_to_cache(cache, journal_content,
journal_content+st.st_size,
SAVED_IN_JOURNAL, 0);
SAVED_IN_JOURNAL, 0, -1, NULL);
if (added) {
total += smartlist_len(added);
smartlist_free(added);
@ -275,6 +311,47 @@ microdesc_cache_reload(microdesc_cache_t *cache)
return 0;
}
/** DOCDOC */
#define TOLERATE_MICRODESC_AGE (7*24*60*60)
/** DOCDOC */
void
microdesc_cache_clean(microdesc_cache_t *cache)
{
networkstatus_t *consensus;
time_t cutoff;
microdesc_t **mdp, *victim;
int dropped=0, kept=0;
size_t bytes_dropped = 0;
time_t now = time(NULL);
/* If we don't know a consensus, never believe last_listed values */
consensus = networkstatus_get_reasonably_live_consensus(now, FLAV_MICRODESC);
if (consensus == NULL)
return;
cutoff = now - TOLERATE_MICRODESC_AGE;
for (mdp = HT_START(microdesc_map, &cache->map); mdp != NULL; ) {
if ((*mdp)->last_listed < cutoff) {
++dropped;
victim = *mdp;
mdp = HT_NEXT_RMV(microdesc_map, &cache->map, mdp);
bytes_dropped += victim->bodylen;
microdesc_free(victim);
} else {
++kept;
mdp = HT_NEXT(microdesc_map, &cache->map, mdp);
}
}
if (dropped) {
log_notice(LD_DIR, "Removed %d/%d microdescriptors as old.",
dropped,dropped+kept);
cache->bytes_dropped += bytes_dropped;
}
}
/** Regenerate the main cache file for <b>cache</b>, clear the journal file,
* and update every microdesc_t in the cache with pointers to its new
* location. */
@ -290,6 +367,9 @@ microdesc_cache_rebuild(microdesc_cache_t *cache)
int orig_size, new_size;
log_info(LD_DIR, "Rebuilding the microdescriptor cache...");
microdesc_cache_clean(cache);
orig_size = (int)(cache->cache_content ? cache->cache_content->size : 0);
orig_size += (int)cache->journal_len;
@ -344,6 +424,7 @@ microdesc_cache_rebuild(microdesc_cache_t *cache)
write_str_to_file(cache->journal_fname, "", 1);
cache->journal_len = 0;
cache->bytes_dropped = 0;
new_size = (int)cache->cache_content->size;
log_info(LD_DIR, "Done rebuilding microdesc cache. "
@ -412,3 +493,90 @@ microdesc_average_size(microdesc_cache_t *cache)
return (size_t)(cache->total_len_seen / cache->n_seen);
}
/** Return a smartlist of all the sha256 digest of the microdescriptors that
* are listed in <b>ns</b> but not present in <b>cache</b>. Returns pointers
* to internals of <b>ns</b>; you should not free the members of the resulting
* smartlist. Omit all microdescriptors whose digest appear in <b>skip</b>. */
smartlist_t *
microdesc_list_missing_digest256(networkstatus_t *ns, microdesc_cache_t *cache,
int downloadable_only, digestmap_t *skip)
{
smartlist_t *result = smartlist_create();
time_t now = time(NULL);
tor_assert(ns->flavor == FLAV_MICRODESC);
SMARTLIST_FOREACH_BEGIN(ns->routerstatus_list, routerstatus_t *, rs) {
if (microdesc_cache_lookup_by_digest256(cache, rs->descriptor_digest))
continue;
if (downloadable_only &&
!download_status_is_ready(&rs->dl_status, now,
MAX_MICRODESC_DOWNLOAD_FAILURES))
continue;
if (skip && digestmap_get(skip, rs->descriptor_digest))
continue;
/* XXXX Also skip if we're a noncache and wouldn't use this router.
* XXXX NM Microdesc
*/
smartlist_add(result, rs->descriptor_digest);
} SMARTLIST_FOREACH_END(rs);
return result;
}
/** DOCDOC */
void
update_microdesc_downloads(time_t now)
{
or_options_t *options = get_options();
networkstatus_t *consensus;
smartlist_t *missing;
digestmap_t *pending;
if (should_delay_dir_fetches(options))
return;
if (directory_too_idle_to_fetch_descriptors(options, now))
return;
consensus = networkstatus_get_reasonably_live_consensus(now, FLAV_MICRODESC);
if (!consensus)
return;
if (!directory_caches_dir_info(options)) {
/* Right now, only caches fetch microdescriptors.
* XXXX NM Microdescs */
return;
}
pending = digestmap_new();
list_pending_microdesc_downloads(pending);
missing = microdesc_list_missing_digest256(consensus,
get_microdesc_cache(),
1,
pending);
digestmap_free(pending, NULL);
launch_descriptor_downloads(DIR_PURPOSE_FETCH_MICRODESC,
missing, NULL, now);
smartlist_free(missing);
}
/** DOCDOC */
void
update_microdescs_from_networkstatus(time_t now)
{
microdesc_cache_t *cache = get_microdesc_cache();
microdesc_t *md;
networkstatus_t *ns =
networkstatus_get_reasonably_live_consensus(now, FLAV_MICRODESC);
if (! ns)
return;
tor_assert(ns->flavor == FLAV_MICRODESC);
SMARTLIST_FOREACH_BEGIN(ns->routerstatus_list, routerstatus_t *, rs) {
md = microdesc_cache_lookup_by_digest256(cache, rs->descriptor_digest);
if (md && ns->valid_after > md->last_listed)
md->last_listed = ns->valid_after;
} SMARTLIST_FOREACH_END(rs);
}

12
src/or/microdesc.h
View File

@ -16,11 +16,13 @@ microdesc_cache_t *get_microdesc_cache(void);
smartlist_t *microdescs_add_to_cache(microdesc_cache_t *cache,
const char *s, const char *eos, saved_location_t where,
int no_save);
int no_save, time_t listed_at,
smartlist_t *requested_digests256);
smartlist_t *microdescs_add_list_to_cache(microdesc_cache_t *cache,
smartlist_t *descriptors, saved_location_t where,
int no_save);
void microdesc_cache_clean(microdesc_cache_t *cache);
int microdesc_cache_rebuild(microdesc_cache_t *cache);
int microdesc_cache_reload(microdesc_cache_t *cache);
void microdesc_cache_clear(microdesc_cache_t *cache);
@ -30,8 +32,16 @@ microdesc_t *microdesc_cache_lookup_by_digest256(microdesc_cache_t *cache,
size_t microdesc_average_size(microdesc_cache_t *cache);
smartlist_t *microdesc_list_missing_digest256(networkstatus_t *ns,
microdesc_cache_t *cache,
int downloadable_only,
digestmap_t *skip);
void microdesc_free(microdesc_t *md);
void microdesc_free_all(void);
void update_microdesc_downloads(time_t now);
void update_microdescs_from_networkstatus(time_t now);
#endif

198
src/or/networkstatus.c
View File

@ -20,6 +20,7 @@
#include "dirserv.h"
#include "dirvote.h"
#include "main.h"
#include "microdesc.h"
#include "networkstatus.h"
#include "relay.h"
#include "router.h"
@ -44,8 +45,19 @@ static strmap_t *named_server_map = NULL;
* as unnamed for some server in the consensus. */
static strmap_t *unnamed_server_map = NULL;
/** Most recently received and validated v3 consensus network status. */
static networkstatus_t *current_consensus = NULL;
/** Most recently received and validated v3 consensus network status,
* of whichever type we are using for our own circuits. This will be the same
* as one of current_ns_consensus or current_md_consensus.
*/
#define current_consensus current_ns_consensus
/** Most recently received and validated v3 "ns"-flavored consensus network
* status. */
static networkstatus_t *current_ns_consensus = NULL;
/** Most recently received and validated v3 "microdec"-flavored consensus
* network status. */
static networkstatus_t *current_md_consensus = NULL;
/** A v3 consensus networkstatus that we've received, but which we don't
* have enough certificates to be happy about. */
@ -271,6 +283,7 @@ router_reload_consensus_networkstatus(void)
update_certificate_downloads(time(NULL));
routers_update_all_from_networkstatus(time(NULL), 3);
update_microdescs_from_networkstatus(time(NULL));
return 0;
}
@ -967,21 +980,25 @@ networkstatus_get_v2_list(void)
}
/** Return the consensus view of the status of the router whose current
* <i>descriptor</i> digest is <b>digest</b>, or NULL if no such router is
* known. */
* <i>descriptor</i> digest in <b>consensus</b> is <b>digest</b>, or NULL if
* no such router is known. */
routerstatus_t *
router_get_consensus_status_by_descriptor_digest(const char *digest)
router_get_consensus_status_by_descriptor_digest(networkstatus_t *consensus,
const char *digest)
{
if (!current_consensus) return NULL;
if (!current_consensus->desc_digest_map) {
digestmap_t * m = current_consensus->desc_digest_map = digestmap_new();
SMARTLIST_FOREACH(current_consensus->routerstatus_list,
if (!consensus)
consensus = current_consensus;
if (!consensus)
return NULL;
if (!consensus->desc_digest_map) {
digestmap_t *m = consensus->desc_digest_map = digestmap_new();
SMARTLIST_FOREACH(consensus->routerstatus_list,
routerstatus_t *, rs,
{
digestmap_set(m, rs->descriptor_digest, rs);
});
}
return digestmap_get(current_consensus->desc_digest_map, digest);
return digestmap_get(consensus->desc_digest_map, digest);
}
/** Given the digest of a router descriptor, return its current download
@ -990,7 +1007,10 @@ download_status_t *
router_get_dl_status_by_descriptor_digest(const char *d)
{
routerstatus_t *rs;
if ((rs = router_get_consensus_status_by_descriptor_digest(d)))
if (!current_ns_consensus)
return NULL;
if ((rs = router_get_consensus_status_by_descriptor_digest(
current_ns_consensus, d)))
return &rs->dl_status;
if (v2_download_status_map)
return digestmap_get(v2_download_status_map, d);
@ -1199,6 +1219,25 @@ update_v2_networkstatus_cache_downloads(time_t now)
}
}
/** DOCDOC */
static int
we_want_to_fetch_flavor(or_options_t *options, int flavor)
{
if (flavor < 0 || flavor > N_CONSENSUS_FLAVORS) {
/* This flavor is crazy; we don't want it */
/*XXXX handle unrecognized flavors later */
return 0;
}
if (authdir_mode_v3(options) || directory_caches_dir_info(options)) {
/* We want to serve all flavors to others, regardless if we would use
* it ourselves. */
return 1;
}
/* Otherwise, we want the flavor only if we want to use it to build
* circuits. */
return (flavor == USABLE_CONSENSUS_FLAVOR);
}
/** How many times will we try to fetch a consensus before we give up? */
#define CONSENSUS_NETWORKSTATUS_MAX_DL_TRIES 8
/** How long will we hang onto a possibly live consensus for which we're
@ -1211,48 +1250,65 @@ static void
update_consensus_networkstatus_downloads(time_t now)
{
int i;
or_options_t *options = get_options();
if (!networkstatus_get_live_consensus(now))
time_to_download_next_consensus = now; /* No live consensus? Get one now!*/
if (time_to_download_next_consensus > now)
return; /* Wait until the current consensus is older. */
/* XXXXNM Microdescs: may need to download more types. */
if (!download_status_is_ready(&consensus_dl_status[FLAV_NS], now,
CONSENSUS_NETWORKSTATUS_MAX_DL_TRIES))
return; /* We failed downloading a consensus too recently. */
if (connection_get_by_type_purpose(CONN_TYPE_DIR,
DIR_PURPOSE_FETCH_CONSENSUS))
return; /* There's an in-progress download.*/
for (i=0; i < N_CONSENSUS_FLAVORS; ++i) {
consensus_waiting_for_certs_t *waiting = &consensus_waiting_for_certs[i];
/* XXXX need some way to download unknown flavors if we are caching. */
const char *resource;
consensus_waiting_for_certs_t *waiting;
if (! we_want_to_fetch_flavor(options, i))
continue;
resource = i==FLAV_NS ? NULL : networkstatus_get_flavor_name(i);
if (!download_status_is_ready(&consensus_dl_status[i], now,
CONSENSUS_NETWORKSTATUS_MAX_DL_TRIES))
continue; /* We failed downloading a consensus too recently. */
if (connection_dir_get_by_purpose_and_resource(
DIR_PURPOSE_FETCH_CONSENSUS, resource))
continue; /* There's an in-progress download.*/
waiting = &consensus_waiting_for_certs[i];
if (waiting->consensus) {
/* XXXX make sure this doesn't delay sane downloads. */
if (waiting->set_at + DELAY_WHILE_FETCHING_CERTS > now)
return; /* We're still getting certs for this one. */
else {
if (waiting->set_at + DELAY_WHILE_FETCHING_CERTS > now) {
continue; /* We're still getting certs for this one. */
} else {
if (!waiting->dl_failed) {
download_status_failed(&consensus_dl_status[FLAV_NS], 0);
download_status_failed(&consensus_dl_status[i], 0);
waiting->dl_failed=1;
}
}
}
}
log_info(LD_DIR, "Launching networkstatus consensus download.");
log_info(LD_DIR, "Launching %s networkstatus consensus download.",
networkstatus_get_flavor_name(i));
directory_get_from_dirserver(DIR_PURPOSE_FETCH_CONSENSUS,
ROUTER_PURPOSE_GENERAL, NULL,
ROUTER_PURPOSE_GENERAL, resource,
PDS_RETRY_IF_NO_SERVERS);
}
}
/** Called when an attempt to download a consensus fails: note that the
* failure occurred, and possibly retry. */
void
networkstatus_consensus_download_failed(int status_code)
networkstatus_consensus_download_failed(int status_code, const char *flavname)
{
/* XXXXNM Microdescs: may need to handle more types. */
download_status_failed(&consensus_dl_status[FLAV_NS], status_code);
int flav = networkstatus_parse_flavor_name(flavname);
if (flav >= 0) {
tor_assert(flav < N_CONSENSUS_FLAVORS);
/* XXXX handle unrecognized flavors */
download_status_failed(&consensus_dl_status[flav], status_code);
/* Retry immediately, if appropriate. */
update_consensus_networkstatus_downloads(time(NULL));
}
}
/** How long do we (as a cache) wait after a consensus becomes non-fresh
@ -1373,7 +1429,10 @@ update_certificate_downloads(time_t now)
now);
}
authority_certs_fetch_missing(current_consensus, now);
if (current_ns_consensus)
authority_certs_fetch_missing(current_ns_consensus, now);
if (current_ns_consensus)
authority_certs_fetch_missing(current_md_consensus, now);
}
/** Return 1 if we have a consensus but we don't have enough certificates
@ -1405,6 +1464,18 @@ networkstatus_get_latest_consensus(void)
return current_consensus;
}
/** DOCDOC */
networkstatus_t *
networkstatus_get_latest_consensus_by_flavor(consensus_flavor_t f)
{
if (f == FLAV_NS)
return current_ns_consensus;
else if (f == FLAV_MICRODESC)
return current_md_consensus;
else
tor_assert(0);
}
/** Return the most recent consensus that we have downloaded, or NULL if it is
* no longer live. */
networkstatus_t *
@ -1424,13 +1495,15 @@ networkstatus_get_live_consensus(time_t now)
/** As networkstatus_get_live_consensus(), but is way more tolerant of expired
* consensuses. */
networkstatus_t *
networkstatus_get_reasonably_live_consensus(time_t now)
networkstatus_get_reasonably_live_consensus(time_t now, int flavor)
{
#define REASONABLY_LIVE_TIME (24*60*60)
if (current_consensus &&
current_consensus->valid_after <= now &&
now <= current_consensus->valid_until+REASONABLY_LIVE_TIME)
return current_consensus;
networkstatus_t *consensus =
networkstatus_get_latest_consensus_by_flavor(flavor);
if (consensus &&
consensus->valid_after <= now &&
now <= consensus->valid_until+REASONABLY_LIVE_TIME)
return consensus;
else
return NULL;
}
@ -1569,6 +1642,7 @@ networkstatus_set_current_consensus(const char *consensus,
const digests_t *current_digests = NULL;
consensus_waiting_for_certs_t *waiting = NULL;
time_t current_valid_after = 0;
int free_consensus = 1;
if (flav < 0) {
/* XXXX we don't handle unrecognized flavors yet. */
@ -1614,9 +1688,16 @@ networkstatus_set_current_consensus(const char *consensus,
if (!strcmp(flavor, "ns")) {
consensus_fname = get_datadir_fname("cached-consensus");
unverified_fname = get_datadir_fname("unverified-consensus");
if (current_consensus) {
current_digests = &current_consensus->digests;
current_valid_after = current_consensus->valid_after;
if (current_ns_consensus) {
current_digests = &current_ns_consensus->digests;
current_valid_after = current_ns_consensus->valid_after;
}
} else if (!strcmp(flavor, "microdesc")) {
consensus_fname = get_datadir_fname("cached-microdesc-consensus");
unverified_fname = get_datadir_fname("unverified-microdesc-consensus");
if (current_md_consensus) {
current_digests = &current_md_consensus->digests;
current_valid_after = current_md_consensus->valid_after;
}
} else {
cached_dir_t *cur;
@ -1702,11 +1783,21 @@ networkstatus_set_current_consensus(const char *consensus,
if (flav == USABLE_CONSENSUS_FLAVOR) {
notify_control_networkstatus_changed(current_consensus, c);
if (current_consensus) {
networkstatus_copy_old_consensus_info(c, current_consensus);
networkstatus_vote_free(current_consensus);
}
if (flav == FLAV_NS) {
if (current_ns_consensus) {
networkstatus_copy_old_consensus_info(c, current_ns_consensus);
networkstatus_vote_free(current_ns_consensus);
}
current_ns_consensus = c;
free_consensus = 0; /* avoid free */
} else if (flav == FLAV_MICRODESC) {
if (current_md_consensus) {
networkstatus_copy_old_consensus_info(c, current_md_consensus);
networkstatus_vote_free(current_md_consensus);
}
current_md_consensus = c;
free_consensus = 0; /* avoid free */
}
waiting = &consensus_waiting_for_certs[flav];
@ -1739,11 +1830,9 @@ networkstatus_set_current_consensus(const char *consensus,
}
if (flav == USABLE_CONSENSUS_FLAVOR) {
current_consensus = c;
c = NULL; /* Prevent free. */
/* XXXXNM Microdescs: needs a non-ns variant. */
update_consensus_networkstatus_fetch_time(now);
dirvote_recalculate_timing(options, now);
routerstatus_list_update_named_server_map();
cell_ewma_set_scale_factor(options, current_consensus);
@ -1758,11 +1847,11 @@ networkstatus_set_current_consensus(const char *consensus,
write_str_to_file(consensus_fname, consensus, 0);
}
if (ftime_definitely_before(now, current_consensus->valid_after)) {
if (ftime_definitely_before(now, c->valid_after)) {
char tbuf[ISO_TIME_LEN+1];
char dbuf[64];
long delta = now - current_consensus->valid_after;
format_iso_time(tbuf, current_consensus->valid_after);
long delta = now - c->valid_after;
format_iso_time(tbuf, c->valid_after);
format_time_interval(dbuf, sizeof(dbuf), delta);
log_warn(LD_GENERAL, "Our clock is %s behind the time published in the "
"consensus network status document (%s GMT). Tor needs an "
@ -1776,6 +1865,7 @@ networkstatus_set_current_consensus(const char *consensus,
result = 0;
done:
if (free_consensus)
networkstatus_vote_free(c);
tor_free(consensus_fname);
tor_free(unverified_fname);
@ -1812,7 +1902,8 @@ void
routers_update_all_from_networkstatus(time_t now, int dir_version)
{
routerlist_t *rl = router_get_routerlist();
networkstatus_t *consensus = networkstatus_get_live_consensus(now);
networkstatus_t *consensus = networkstatus_get_reasonably_live_consensus(now,
FLAV_NS);
if (networkstatus_v2_list_has_changed)
download_status_map_update_from_v2_networkstatus();
@ -2028,7 +2119,7 @@ routers_update_status_from_consensus_networkstatus(smartlist_t *routers,
void
signed_descs_update_status_from_consensus_networkstatus(smartlist_t *descs)
{
networkstatus_t *ns = current_consensus;
networkstatus_t *ns = current_ns_consensus;
if (!ns)
return;
@ -2036,7 +2127,7 @@ signed_descs_update_status_from_consensus_networkstatus(smartlist_t *descs)
char dummy[DIGEST_LEN];
/* instantiates the digest map. */
memset(dummy, 0, sizeof(dummy));
router_get_consensus_status_by_descriptor_digest(dummy);
router_get_consensus_status_by_descriptor_digest(ns, dummy);
}
SMARTLIST_FOREACH(descs, signed_descriptor_t *, d,
{
@ -2264,8 +2355,9 @@ networkstatus_free_all(void)
digestmap_free(v2_download_status_map, _tor_free);
v2_download_status_map = NULL;
networkstatus_vote_free(current_consensus);
current_consensus = NULL;
networkstatus_vote_free(current_ns_consensus);
networkstatus_vote_free(current_md_consensus);
current_md_consensus = current_ns_consensus = NULL;
for (i=0; i < N_CONSENSUS_FLAVORS; ++i) {
consensus_waiting_for_certs_t *waiting = &consensus_waiting_for_certs[i];

9
src/or/networkstatus.h
View File

@ -48,12 +48,14 @@ const smartlist_t *networkstatus_get_v2_list(void);
download_status_t *router_get_dl_status_by_descriptor_digest(const char *d);
routerstatus_t *router_get_consensus_status_by_id(const char *digest);
routerstatus_t *router_get_consensus_status_by_descriptor_digest(
networkstatus_t *consensus,
const char *digest);
routerstatus_t *router_get_consensus_status_by_nickname(const char *nickname,
int warn_if_unnamed);
const char *networkstatus_get_router_digest_by_nickname(const char *nickname);
int networkstatus_nickname_is_unnamed(const char *nickname);
void networkstatus_consensus_download_failed(int status_code);
void networkstatus_consensus_download_failed(int status_code,
const char *flavname);
void update_consensus_networkstatus_fetch_time(time_t now);
int should_delay_dir_fetches(or_options_t *options);
void update_networkstatus_downloads(time_t now);
@ -61,8 +63,11 @@ void update_certificate_downloads(time_t now);
int consensus_is_waiting_for_certs(void);
networkstatus_v2_t *networkstatus_v2_get_by_digest(const char *digest);
networkstatus_t *networkstatus_get_latest_consensus(void);
networkstatus_t *networkstatus_get_latest_consensus_by_flavor(
consensus_flavor_t f);
networkstatus_t *networkstatus_get_live_consensus(time_t now);
networkstatus_t *networkstatus_get_reasonably_live_consensus(time_t now);
networkstatus_t *networkstatus_get_reasonably_live_consensus(time_t now,
int flavor);
#define NSSET_FROM_CACHE 1
#define NSSET_WAS_WAITING_FOR_CERTS 2
#define NSSET_DONT_DOWNLOAD_CERTS 4

24
src/or/or.h
View File

@ -391,7 +391,9 @@ typedef enum {
/** A connection to a hidden service directory server: download a v2 rendezvous
* descriptor. */
#define DIR_PURPOSE_FETCH_RENDDESC_V2 18
#define _DIR_PURPOSE_MAX 18
/** A connection to a directory server: download a microdescriptor. */
#define DIR_PURPOSE_FETCH_MICRODESC 19
#define _DIR_PURPOSE_MAX 19
/** True iff <b>p</b> is a purpose corresponding to uploading data to a
* directory server. */
@ -1191,8 +1193,13 @@ typedef struct edge_connection_t {
typedef struct dir_connection_t {
connection_t _base;
char *requested_resource; /**< Which 'resource' did we ask the directory
* for? */
/** Which 'resource' did we ask the directory for? This is typically the part
* of the URL string that defines, relative to the directory conn purpose,
* what thing we want. For example, in router descriptor downloads by
* descriptor digest, it contains "d/", then one ore more +-separated
* fingerprints.
**/
char *requested_resource;
unsigned int dirconn_direct:1; /**< Is this dirconn direct, or via Tor? */
/* Used only for server sides of some dir connections, to implement
@ -1569,8 +1576,9 @@ typedef struct routerstatus_t {
* has. */
char identity_digest[DIGEST_LEN]; /**< Digest of the router's identity
* key. */
char descriptor_digest[DIGEST_LEN]; /**< Digest of the router's most recent
* descriptor. */
/** Digest of the router's most recent descriptor or microdescriptor.
* If it's a descriptor, we only use the first DIGEST_LEN bytes. */
char descriptor_digest[DIGEST256_LEN];
uint32_t addr; /**< IPv4 address for this router. */
uint16_t or_port; /**< OR port for this router. */
uint16_t dir_port; /**< Directory port for this router. */
@ -1689,6 +1697,10 @@ typedef struct microdesc_t {
* up? */
#define MAX_ROUTERDESC_DOWNLOAD_FAILURES 8
/** How many times will we try to download a microdescriptor before giving
* up? */
#define MAX_MICRODESC_DOWNLOAD_FAILURES 8
/** Contents of a v2 (non-consensus, non-vote) network status object. */
typedef struct networkstatus_v2_t {
/** When did we receive the network-status document? */
@ -3516,6 +3528,8 @@ typedef struct trusted_dir_server_t {
* fetches to _any_ single directory server.]
*/
#define PDS_NO_EXISTING_SERVERDESC_FETCH (1<<3)
#define PDS_NO_EXISTING_MICRODESC_FETCH (1<<4)
#define _PDS_PREFER_TUNNELED_DIR_CONNS (1<<16)
/** Possible ways to weight routers when choosing one randomly. See

130
src/or/routerlist.c
View File

@ -22,6 +22,7 @@
#include "geoip.h"
#include "hibernate.h"
#include "main.h"
#include "microdesc.h"
#include "networkstatus.h"
#include "policies.h"
#include "reasons.h"
@ -44,9 +45,6 @@ static routerstatus_t *router_pick_trusteddirserver_impl(
static void mark_all_trusteddirservers_up(void);
static int router_nickname_matches(routerinfo_t *router, const char *nickname);
static void trusted_dir_server_free(trusted_dir_server_t *ds);
static void launch_router_descriptor_downloads(smartlist_t *downloadable,
routerstatus_t *source,
time_t now);
static int signed_desc_digest_is_recognized(signed_descriptor_t *desc);
static void update_router_have_minimum_dir_info(void);
static const char *signed_descriptor_get_body_impl(signed_descriptor_t *desc,
@ -1047,7 +1045,8 @@ router_pick_trusteddirserver(authority_type_t type, int flags)
/* If the reason that we got no server is that servers are "busy",
* we must be excluding good servers because we already have serverdesc
* fetches with them. Do not mark down servers up because of this. */
tor_assert((flags & PDS_NO_EXISTING_SERVERDESC_FETCH));
tor_assert((flags & (PDS_NO_EXISTING_SERVERDESC_FETCH|
PDS_NO_EXISTING_MICRODESC_FETCH)));
return NULL;
}
@ -1174,6 +1173,7 @@ router_pick_trusteddirserver_impl(authority_type_t type, int flags,
const int fascistfirewall = ! (flags & PDS_IGNORE_FASCISTFIREWALL);
const int prefer_tunnel = (flags & _PDS_PREFER_TUNNELED_DIR_CONNS);
const int no_serverdesc_fetching =(flags & PDS_NO_EXISTING_SERVERDESC_FETCH);
const int no_microdesc_fetching =(flags & PDS_NO_EXISTING_MICRODESC_FETCH);
int n_busy = 0;
if (!trusted_dir_servers)
@ -1212,6 +1212,13 @@ router_pick_trusteddirserver_impl(authority_type_t type, int flags,
continue;
}
}
if (no_microdesc_fetching) {
if (connection_get_by_type_addr_port_purpose(
CONN_TYPE_DIR, &addr, d->dir_port, DIR_PURPOSE_FETCH_MICRODESC)) {
++n_busy;
continue;
}
}
if (prefer_tunnel &&
d->or_port &&
@ -3874,6 +3881,7 @@ routerlist_retry_directory_downloads(time_t now)
router_reset_descriptor_download_failures();
update_networkstatus_downloads(now);
update_router_descriptor_downloads(now);
update_microdesc_downloads(now);
}
/** Return 1 if all running sufficiently-stable routers will reject
@ -4035,7 +4043,9 @@ any_trusted_dir_is_v1_authority(void)
/** For every current directory connection whose purpose is <b>purpose</b>,
* and where the resource being downloaded begins with <b>prefix</b>, split
* rest of the resource into base16 fingerprints, decode them, and set the
* corresponding elements of <b>result</b> to a nonzero value. */
* corresponding elements of <b>result</b> to a nonzero value.
* DOCDOC purpose==microdesc
*/
static void
list_pending_downloads(digestmap_t *result,
int purpose, const char *prefix)
@ -4043,20 +4053,23 @@ list_pending_downloads(digestmap_t *result,
const size_t p_len = strlen(prefix);
smartlist_t *tmp = smartlist_create();
smartlist_t *conns = get_connection_array();
int flags = DSR_HEX;
if (purpose == DIR_PURPOSE_FETCH_MICRODESC)
flags = DSR_DIGEST256|DSR_BASE64;
tor_assert(result);
SMARTLIST_FOREACH(conns, connection_t *, conn,
{
SMARTLIST_FOREACH_BEGIN(conns, connection_t *, conn) {
if (conn->type == CONN_TYPE_DIR &&
conn->purpose == purpose &&
!conn->marked_for_close) {
const char *resource = TO_DIR_CONN(conn)->requested_resource;
if (!strcmpstart(resource, prefix))
dir_split_resource_into_fingerprints(resource + p_len,
tmp, NULL, DSR_HEX);
tmp, NULL, flags);
}
});
} SMARTLIST_FOREACH_END(conn);
SMARTLIST_FOREACH(tmp, char *, d,
{
digestmap_set(result, d, (void*)1);
@ -4076,10 +4089,18 @@ list_pending_descriptor_downloads(digestmap_t *result, int extrainfo)
list_pending_downloads(result, purpose, "d/");
}
/** Launch downloads for all the descriptors whose digests are listed
* as digests[i] for lo <= i < hi. (Lo and hi may be out of range.)
* If <b>source</b> is given, download from <b>source</b>; otherwise,
* download from an appropriate random directory server.
/** DOCDOC */
/*XXXX NM should use digest256, if one comes into being. */
void
list_pending_microdesc_downloads(digestmap_t *result)
{
list_pending_downloads(result, DIR_PURPOSE_FETCH_MICRODESC, "d/");
}
/** Launch downloads for all the descriptors whose digests or digests256
* are listed as digests[i] for lo <= i < hi. (Lo and hi may be out of
* range.) If <b>source</b> is given, download from <b>source</b>;
* otherwise, download from an appropriate random directory server.
*/
static void
initiate_descriptor_downloads(routerstatus_t *source,
@ -4090,6 +4111,20 @@ initiate_descriptor_downloads(routerstatus_t *source,
int i, n = hi-lo;
char *resource, *cp;
size_t r_len;
int digest_len = DIGEST_LEN, enc_digest_len = HEX_DIGEST_LEN;
char sep = '+';
int b64_256 = 0;
if (purpose == DIR_PURPOSE_FETCH_MICRODESC) {
/* Microdescriptors are downloaded by "-"-separated base64-encoded
* 256-bit digests. */
digest_len = DIGEST256_LEN;
enc_digest_len = BASE64_DIGEST256_LEN;
sep = '-';
b64_256 = 1;
}
if (n <= 0)
return;
if (lo < 0)
@ -4097,15 +4132,19 @@ initiate_descriptor_downloads(routerstatus_t *source,
if (hi > smartlist_len(digests))
hi = smartlist_len(digests);
r_len = 8 + (HEX_DIGEST_LEN+1)*n;
r_len = 8 + (enc_digest_len+1)*n;
cp = resource = tor_malloc(r_len);
memcpy(cp, "d/", 2);
cp += 2;
for (i = lo; i < hi; ++i) {
if (b64_256) {
digest256_to_base64(cp, smartlist_get(digests, i));
} else {
base16_encode(cp, r_len-(cp-resource),
smartlist_get(digests,i), DIGEST_LEN);
cp += HEX_DIGEST_LEN;
*cp++ = '+';
smartlist_get(digests,i), digest_len);
}
cp += enc_digest_len;
*cp++ = sep;
}
memcpy(cp-1, ".z", 3);
@ -4152,6 +4191,7 @@ client_would_use_router(routerstatus_t *rs, time_t now, or_options_t *options)
* So use 96 because it's a nice number.
*/
#define MAX_DL_PER_REQUEST 96
#define MAX_MICRODESC_DL_PER_REQUEST 92
/** Don't split our requests so finely that we are requesting fewer than
* this number per server. */
#define MIN_DL_PER_REQUEST 4
@ -4166,21 +4206,33 @@ client_would_use_router(routerstatus_t *rs, time_t now, or_options_t *options)
* them until they have more, or until this amount of time has passed. */
#define MAX_CLIENT_INTERVAL_WITHOUT_REQUEST (10*60)
/** Given a list of router descriptor digests in <b>downloadable</b>, decide
* whether to delay fetching until we have more. If we don't want to delay,
* launch one or more requests to the appropriate directory authorities. */
static void
launch_router_descriptor_downloads(smartlist_t *downloadable,
/** Given a <b>purpose</b> (FETCH_MICRODESC or FETCH_SERVERDESC) and a list of
* router descriptor digests or microdescriptor digest256s in
* <b>downloadable</b>, decide whether to delay fetching until we have more.
* If we don't want to delay, launch one or more requests to the appropriate
* directory authorities.
*/
void
launch_descriptor_downloads(int purpose,
smartlist_t *downloadable,
routerstatus_t *source, time_t now)
{
int should_delay = 0, n_downloadable;
or_options_t *options = get_options();
const char *descname;
tor_assert(purpose == DIR_PURPOSE_FETCH_SERVERDESC ||
purpose == DIR_PURPOSE_FETCH_MICRODESC);
descname = (purpose == DIR_PURPOSE_FETCH_SERVERDESC) ?
"routerdesc" : "microdesc";
n_downloadable = smartlist_len(downloadable);
if (!directory_fetches_dir_info_early(options)) {
if (n_downloadable >= MAX_DL_TO_DELAY) {
log_debug(LD_DIR,
"There are enough downloadable routerdescs to launch requests.");
"There are enough downloadable %ss to launch requests.",
descname);
should_delay = 0;
} else {
should_delay = (last_routerdesc_download_attempted +
@ -4188,13 +4240,15 @@ launch_router_descriptor_downloads(smartlist_t *downloadable,
if (!should_delay && n_downloadable) {
if (last_routerdesc_download_attempted) {
log_info(LD_DIR,
"There are not many downloadable routerdescs, but we've "
"There are not many downloadable %ss, but we've "
"been waiting long enough (%d seconds). Downloading.",
descname,
(int)(now-last_routerdesc_download_attempted));
} else {
log_info(LD_DIR,
"There are not many downloadable routerdescs, but we haven't "
"tried downloading descriptors recently. Downloading.");
"There are not many downloadable %ss, but we haven't "
"tried downloading descriptors recently. Downloading.",
descname);
}
}
}
@ -4221,12 +4275,20 @@ launch_router_descriptor_downloads(smartlist_t *downloadable,
* update_router_descriptor_downloads() later on, once the connections
* have succeeded or failed.
*/
pds_flags |= PDS_NO_EXISTING_SERVERDESC_FETCH;
pds_flags |= (purpose == DIR_PURPOSE_FETCH_MICRODESC) ?
PDS_NO_EXISTING_MICRODESC_FETCH :
PDS_NO_EXISTING_SERVERDESC_FETCH;
}
n_per_request = CEIL_DIV(n_downloadable, MIN_REQUESTS);
if (purpose == DIR_PURPOSE_FETCH_MICRODESC) {
if (n_per_request > MAX_MICRODESC_DL_PER_REQUEST)
n_per_request = MAX_MICRODESC_DL_PER_REQUEST;
} else {
if (n_per_request > MAX_DL_PER_REQUEST)
n_per_request = MAX_DL_PER_REQUEST;
}
if (n_per_request < MIN_DL_PER_REQUEST)
n_per_request = MIN_DL_PER_REQUEST;
@ -4241,7 +4303,7 @@ launch_router_descriptor_downloads(smartlist_t *downloadable,
req_plural, n_downloadable, rtr_plural, n_per_request);
smartlist_sort_digests(downloadable);
for (i=0; i < n_downloadable; i += n_per_request) {
initiate_descriptor_downloads(source, DIR_PURPOSE_FETCH_SERVERDESC,
initiate_descriptor_downloads(source, purpose,
downloadable, i, i+n_per_request,
pds_flags);
}
@ -4514,7 +4576,8 @@ update_consensus_router_descriptor_downloads(time_t now, int is_vote,
smartlist_len(downloadable), n_delayed, n_have, n_in_oldrouters,
n_would_reject, n_wouldnt_use, n_inprogress);
launch_router_descriptor_downloads(downloadable, source, now);
launch_descriptor_downloads(DIR_PURPOSE_FETCH_SERVERDESC,
downloadable, source, now);
digestmap_free(map, NULL);
done:
@ -4539,10 +4602,13 @@ update_router_descriptor_downloads(time_t now)
if (directory_fetches_dir_info_early(options)) {
update_router_descriptor_cache_downloads_v2(now);
}
update_consensus_router_descriptor_downloads(now, 0,
networkstatus_get_reasonably_live_consensus(now));
networkstatus_get_reasonably_live_consensus(now, FLAV_NS));
/* XXXX021 we could be smarter here; see notes on bug 652. */
/* XXXX NM Microdescs: if we're not fetching microdescriptors, we need
* to make something else invoke this. */
/* If we're a server that doesn't have a configured address, we rely on
* directory fetches to learn when our address changes. So if we haven't
* tried to get any routerdescs in a long time, try a dummy fetch now. */
@ -4713,7 +4779,7 @@ count_loading_descriptors_progress(void)
int num_present = 0, num_usable=0;
time_t now = time(NULL);
const networkstatus_t *consensus =
networkstatus_get_reasonably_live_consensus(now);
networkstatus_get_reasonably_live_consensus(now, FLAV_NS);
double fraction;
if (!consensus)
@ -4743,7 +4809,7 @@ update_router_have_minimum_dir_info(void)
int res;
or_options_t *options = get_options();
const networkstatus_t *consensus =
networkstatus_get_reasonably_live_consensus(now);
networkstatus_get_reasonably_live_consensus(now, FLAV_NS);
if (!consensus) {
if (!networkstatus_get_latest_consensus())

6
src/or/routerlist.h
View File

@ -192,5 +192,11 @@ int hid_serv_get_responsible_directories(smartlist_t *responsible_dirs,
int hid_serv_acting_as_directory(void);
int hid_serv_responsible_for_desc_id(const char *id);
void list_pending_microdesc_downloads(digestmap_t *result);
void launch_descriptor_downloads(int purpose,
smartlist_t *downloadable,
routerstatus_t *source,
time_t now);
#endif

18
src/or/routerparse.c
View File

@ -1943,6 +1943,7 @@ routerstatus_parse_entry_from_string(memarea_t *area,
if (!consensus_method)
flav = FLAV_NS;
tor_assert(flav == FLAV_NS || flav == FLAV_MICRODESC);
eos = find_start_of_next_routerstatus(*s);
@ -1955,15 +1956,16 @@ routerstatus_parse_entry_from_string(memarea_t *area,
goto err;
}
tok = find_by_keyword(tokens, K_R);
tor_assert(tok->n_args >= 7);
tor_assert(tok->n_args >= 7); /* guaranteed by GE(7) in K_R setup */
if (flav == FLAV_NS) {
if (tok->n_args < 8) {
log_warn(LD_DIR, "Too few arguments to r");
goto err;
}
} else {
offset = -1;
} else if (flav == FLAV_MICRODESC) {
offset = -1; /* There is no identity digest */
}
if (vote_rs) {
rs = &vote_rs->status;
} else {
@ -2139,6 +2141,16 @@ routerstatus_parse_entry_from_string(memarea_t *area,
vote_rs->microdesc = line;
}
} SMARTLIST_FOREACH_END(t);
} else if (flav == FLAV_MICRODESC) {
tok = find_opt_by_keyword(tokens, K_M);
if (tok) {
tor_assert(tok->n_args);
if (digest256_from_base64(rs->descriptor_digest, tok->args[0])) {
log_warn(LD_DIR, "Error decoding microdescriptor digest %s",
escaped(tok->args[0]));
goto err;
}
}
}
if (!strcasecmp(rs->nickname, UNNAMED_ROUTER_NICKNAME))