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Make router_pick_directory_server respect PDS_NO_EXISTING_*

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This commit is contained in:
Arlo Breault 2014-09-23 12:19:15 -04:00 committed by Nick Mathewson
parent f752093e16
commit 29f15a97ed
1 changed files with 43 additions and 10 deletions
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53
src/or/routerlist.c
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@ -65,7 +65,7 @@ static int compute_weighted_bandwidths(const smartlist_t *sl,
bandwidth_weight_rule_t rule,
u64_dbl_t **bandwidths_out);
static const routerstatus_t *router_pick_directory_server_impl(
dirinfo_type_t auth, int flags);
dirinfo_type_t auth, int flags, int *n_busy_out);
static const routerstatus_t *router_pick_trusteddirserver_impl(
const smartlist_t *sourcelist, dirinfo_type_t auth,
int flags, int *n_busy_out);
@ -1239,6 +1239,7 @@ router_get_fallback_dir_servers(void)
const routerstatus_t *
router_pick_directory_server(dirinfo_type_t type, int flags)
{
int busy = 0;
const routerstatus_t *choice;
if (get_options()->PreferTunneledDirConns)
flags |= PDS_PREFER_TUNNELED_DIR_CONNS_;
@ -1246,17 +1247,26 @@ router_pick_directory_server(dirinfo_type_t type, int flags)
if (!routerlist)
return NULL;
choice = router_pick_directory_server_impl(type, flags);
choice = router_pick_directory_server_impl(type, flags, &busy);
if (choice || !(flags & PDS_RETRY_IF_NO_SERVERS))
return choice;
if (busy) {
/* 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|
PDS_NO_EXISTING_MICRODESC_FETCH)));
return NULL;
}
log_info(LD_DIR,
"No reachable router entries for dirservers. "
"Trying them all again.");
/* mark all authdirservers as up again */
mark_all_dirservers_up(fallback_dir_servers);
/* try again */
choice = router_pick_directory_server_impl(type, flags);
choice = router_pick_directory_server_impl(type, flags, NULL);
return choice;
}
@ -1375,7 +1385,8 @@ router_pick_dirserver_generic(smartlist_t *sourcelist,
* that we can use with BEGINDIR.
*/
static const routerstatus_t *
router_pick_directory_server_impl(dirinfo_type_t type, int flags)
router_pick_directory_server_impl(dirinfo_type_t type, int flags,
int *n_busy_out)
{
const or_options_t *options = get_options();
const node_t *result;
@ -1384,11 +1395,13 @@ router_pick_directory_server_impl(dirinfo_type_t type, int flags)
smartlist_t *overloaded_direct, *overloaded_tunnel;
time_t now = time(NULL);
const networkstatus_t *consensus = networkstatus_get_latest_consensus();
int requireother = ! (flags & PDS_ALLOW_SELF);
int fascistfirewall = ! (flags & PDS_IGNORE_FASCISTFIREWALL);
int prefer_tunnel = (flags & PDS_PREFER_TUNNELED_DIR_CONNS_);
int for_guard = (flags & PDS_FOR_GUARD);
int try_excluding = 1, n_excluded = 0;
const int requireother = ! (flags & PDS_ALLOW_SELF);
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);
const int for_guard = (flags & PDS_FOR_GUARD);
int try_excluding = 1, n_excluded = 0, n_busy = 0;
if (!consensus)
return NULL;
@ -1435,7 +1448,24 @@ router_pick_directory_server_impl(dirinfo_type_t type, int flags)
}
/* XXXX IP6 proposal 118 */
tor_addr_from_ipv4h(&addr, node->rs->addr);
tor_addr_from_ipv4h(&addr, status->addr);
if (no_serverdesc_fetching && (
connection_get_by_type_addr_port_purpose(
CONN_TYPE_DIR, &addr, status->dir_port, DIR_PURPOSE_FETCH_SERVERDESC)
|| connection_get_by_type_addr_port_purpose(
CONN_TYPE_DIR, &addr, status->dir_port, DIR_PURPOSE_FETCH_EXTRAINFO)
)) {
++n_busy;
continue;
}
if (no_microdesc_fetching && connection_get_by_type_addr_port_purpose(
CONN_TYPE_DIR, &addr, status->dir_port, DIR_PURPOSE_FETCH_MICRODESC)
) {
++n_busy;
continue;
}
is_overloaded = status->last_dir_503_at + DIR_503_TIMEOUT > now;
@ -1476,6 +1506,9 @@ router_pick_directory_server_impl(dirinfo_type_t type, int flags)
smartlist_free(overloaded_direct);
smartlist_free(overloaded_tunnel);
if (n_busy_out)
*n_busy_out = n_busy;
if (result == NULL && try_excluding && !options->StrictNodes && n_excluded) {
/* If we got no result, and we are excluding nodes, and StrictNodes is
* not set, try again without excluding nodes. */