commit 4906188b622872899f76cf01167cfef3e09cbffd Author: Roger Dingledine arma@torproject.org Date: Fri Mar 11 03:09:24 2011 -0500

handle excludenodes for dir fetch/post

If we're picking a random directory node, never pick an excluded one. But if we've chosen a specific one (or all), allow it unless strictnodes is set (in which case warn so the user knows it's their fault).

When warning that we won't connect to a strictly excluded node, log what it was we were trying to do at that node.

When ExcludeNodes is set but StrictNodes is not set, we only use non-excluded nodes if we can, but fall back to using excluded nodes if none of those nodes is usable. --- src/or/directory.c | 31 +++++++++++++++++++++++++++++-- src/or/routerlist.c | 37 +++++++++++++++++++++++++++++++++++++ 2 files changed, 66 insertions(+), 2 deletions(-)

diff --git a/src/or/directory.c b/src/or/directory.c index 8f33a60..0c095fe 100644 --- a/src/or/directory.c +++ b/src/or/directory.c @@ -253,10 +253,13 @@ directories_have_accepted_server_descriptor(void) }

/** Start a connection to every suitable directory authority, using - * connection purpose 'purpose' and uploading the payload 'payload' - * (length 'payload_len'). dir_purpose should be one of + * connection purpose <b>dir_purpose</b> and uploading <b>payload</b> + * (of length <b>payload_len</b>). The dir_purpose should be one of * 'DIR_PURPOSE_UPLOAD_DIR' or 'DIR_PURPOSE_UPLOAD_RENDDESC'. * + * <b>router_purpose</b> describes the type of descriptor we're + * publishing, if we're publishing a descriptor -- e.g. general or bridge. + * * <b>type</b> specifies what sort of dir authorities (V1, V2, * HIDSERV, BRIDGE) we should upload to. * @@ -272,6 +275,7 @@ directory_post_to_dirservers(uint8_t dir_purpose, uint8_t router_purpose, const char *payload, size_t payload_len, size_t extrainfo_len) { + or_options_t *options = get_options(); int post_via_tor; smartlist_t *dirservers = router_get_trusted_dir_servers(); int found = 0; @@ -287,6 +291,16 @@ directory_post_to_dirservers(uint8_t dir_purpose, uint8_t router_purpose, if ((type & ds->type) == 0) continue;

+ if (options->ExcludeNodes && options->StrictNodes && + routerset_contains_routerstatus(options->ExcludeNodes, rs)) { + log_warn(LD_DIR, "Wanted to contact authority '%s' for %s, but " + "it's in our ExcludedNodes list and StrictNodes is set. " + "Skipping.", + ds->nickname, + dir_conn_purpose_to_string(dir_purpose)); + continue; + } + found = 1; /* at least one authority of this type was listed */ if (dir_purpose == DIR_PURPOSE_UPLOAD_DIR) ds->has_accepted_serverdesc = 0; @@ -496,12 +510,14 @@ directory_initiate_command_routerstatus_rend(routerstatus_t *status, time_t if_modified_since, const rend_data_t *rend_query) { + or_options_t *options = get_options(); routerinfo_t *router; char address_buf[INET_NTOA_BUF_LEN+1]; struct in_addr in; const char *address; tor_addr_t addr; router = router_get_by_digest(status->identity_digest); + if (!router && anonymized_connection) { log_info(LD_DIR, "Not sending anonymized request to directory '%s'; we " "don't have its router descriptor.", status->nickname); @@ -514,6 +530,17 @@ directory_initiate_command_routerstatus_rend(routerstatus_t *status, address = address_buf; } tor_addr_from_ipv4h(&addr, status->addr); + + if (options->ExcludeNodes && options->StrictNodes && + routerset_contains_routerstatus(options->ExcludeNodes, status)) { + log_warn(LD_DIR, "Wanted to contact directory mirror '%s' for %s, but " + "it's in our ExcludedNodes list and StrictNodes is set. " + "Skipping. This choice might make your Tor not work.", + status->nickname, + dir_conn_purpose_to_string(dir_purpose)); + return; + } + directory_initiate_command_rend(address, &addr, status->or_port, status->dir_port, status->version_supports_conditional_consensus, diff --git a/src/or/routerlist.c b/src/or/routerlist.c index 5d9ab8c..29e2e96 100644 --- a/src/or/routerlist.c +++ b/src/or/routerlist.c @@ -1070,6 +1070,7 @@ router_pick_trusteddirserver(authority_type_t type, int flags) static routerstatus_t * router_pick_directory_server_impl(authority_type_t type, int flags) { + or_options_t *options = get_options(); routerstatus_t *result; smartlist_t *direct, *tunnel; smartlist_t *trusted_direct, *trusted_tunnel; @@ -1079,10 +1080,13 @@ router_pick_directory_server_impl(authority_type_t type, int flags) int requireother = ! (flags & PDS_ALLOW_SELF); int fascistfirewall = ! (flags & PDS_IGNORE_FASCISTFIREWALL); int prefer_tunnel = (flags & _PDS_PREFER_TUNNELED_DIR_CONNS); + int try_excluding = 1, n_excluded = 0;

if (!consensus) return NULL;

+ retry_without_exclude: + direct = smartlist_create(); tunnel = smartlist_create(); trusted_direct = smartlist_create(); @@ -1114,6 +1118,11 @@ router_pick_directory_server_impl(authority_type_t type, int flags) if ((type & EXTRAINFO_CACHE) && !router_supports_extrainfo(status->identity_digest, 0)) continue; + if (try_excluding && options->ExcludeNodes && + routerset_contains_routerstatus(options->ExcludeNodes, status)) { + ++n_excluded; + continue; + }

/* XXXX IP6 proposal 118 */ tor_addr_from_ipv4h(&addr, status->addr); @@ -1155,6 +1164,15 @@ router_pick_directory_server_impl(authority_type_t type, int flags) smartlist_free(trusted_tunnel); smartlist_free(overloaded_direct); smartlist_free(overloaded_tunnel); + + 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. */ + try_excluding = 0; + n_excluded = 0; + goto retry_without_exclude; + } + return result; }

@@ -1165,6 +1183,7 @@ static routerstatus_t * router_pick_trusteddirserver_impl(authority_type_t type, int flags, int *n_busy_out) { + or_options_t *options = get_options(); smartlist_t *direct, *tunnel; smartlist_t *overloaded_direct, *overloaded_tunnel; routerinfo_t *me = router_get_my_routerinfo(); @@ -1175,10 +1194,13 @@ router_pick_trusteddirserver_impl(authority_type_t type, int flags, const int prefer_tunnel = (flags & _PDS_PREFER_TUNNELED_DIR_CONNS); const int no_serverdesc_fetching =(flags & PDS_NO_EXISTING_SERVERDESC_FETCH); int n_busy = 0; + int try_excluding = 1, n_excluded = 0;

if (!trusted_dir_servers) return NULL;

+ retry_without_exclude: + direct = smartlist_create(); tunnel = smartlist_create(); overloaded_direct = smartlist_create(); @@ -1197,6 +1219,12 @@ router_pick_trusteddirserver_impl(authority_type_t type, int flags, continue; if (requireother && me && router_digest_is_me(d->digest)) continue; + if (try_excluding && options->ExcludeNodes && + routerset_contains_routerstatus(options->ExcludeNodes, + &d->fake_status)) { + ++n_excluded; + continue; + }

/* XXXX IP6 proposal 118 */ tor_addr_from_ipv4h(&addr, d->addr); @@ -1243,6 +1271,15 @@ router_pick_trusteddirserver_impl(authority_type_t type, int flags, smartlist_free(tunnel); smartlist_free(overloaded_direct); smartlist_free(overloaded_tunnel); + + 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. */ + try_excluding = 0; + n_excluded = 0; + goto retry_without_exclude; + } + return result; }