commit 7915efd1b83e45c53eb06cfb384eed024df440c0 Author: Nick Mathewson nickm@torproject.org Date: Mon Apr 16 11:41:45 2018 -0400

Use router_crn_flags in more places, to pass direct-connect flag

In order to fix 25691 and 25692, we need to pass the "direct_conn" flag to more places -- particularly when choosing single-hop tunnels. The right way to do this involves having a couple more functions accept router_crn_flags_t, rather than a big list of boolean arguments.

This commit also makes sure that choose_good_exit_server_general() honors the direct_conn flag, to fix 25691 and 25692. --- src/or/circuitbuild.c | 39 ++++++++++++++++++++++----------------- 1 file changed, 22 insertions(+), 17 deletions(-)

diff --git a/src/or/circuitbuild.c b/src/or/circuitbuild.c index 019b9c51f..96cc8369d 100644 --- a/src/or/circuitbuild.c +++ b/src/or/circuitbuild.c @@ -1827,7 +1827,7 @@ ap_stream_wants_exit_attention(connection_t *conn) * Return NULL if we can't find any suitable routers. */ static const node_t * -choose_good_exit_server_general(int need_uptime, int need_capacity) +choose_good_exit_server_general(router_crn_flags_t flags) { int *n_supported; int n_pending_connections = 0; @@ -1837,6 +1837,9 @@ choose_good_exit_server_general(int need_uptime, int need_capacity) const or_options_t *options = get_options(); const smartlist_t *the_nodes; const node_t *selected_node=NULL; + const int need_uptime = (flags & CRN_NEED_UPTIME) != 0; + const int need_capacity = (flags & CRN_NEED_CAPACITY) != 0; + const int direct_conn = (flags & CRN_DIRECT_CONN) != 0;

connections = get_connection_array();

@@ -1869,7 +1872,7 @@ choose_good_exit_server_general(int need_uptime, int need_capacity) */ continue; } - if (!node_has_preferred_descriptor(node, 0)) { + if (!node_has_preferred_descriptor(node, direct_conn)) { n_supported[i] = -1; continue; } @@ -1982,7 +1985,8 @@ choose_good_exit_server_general(int need_uptime, int need_capacity) need_capacity?", fast":"", need_uptime?", stable":""); tor_free(n_supported); - return choose_good_exit_server_general(0, 0); + flags &= ~(CRN_NEED_UPTIME|CRN_NEED_CAPACITY); + return choose_good_exit_server_general(flags); } log_notice(LD_CIRC, "All routers are down or won't exit%s -- " "choosing a doomed exit at random.", @@ -2229,17 +2233,11 @@ pick_restricted_middle_node(router_crn_flags_t flags, * toward the preferences in 'options'. */ static const node_t * -choose_good_exit_server(origin_circuit_t *circ, int need_uptime, - int need_capacity, int is_internal, int need_hs_v3) +choose_good_exit_server(origin_circuit_t *circ, + router_crn_flags_t flags, int is_internal) { const or_options_t *options = get_options(); - router_crn_flags_t flags = CRN_NEED_DESC; - if (need_uptime) - flags |= CRN_NEED_UPTIME; - if (need_capacity) - flags |= CRN_NEED_CAPACITY; - if (need_hs_v3) - flags |= CRN_RENDEZVOUS_V3; + flags |= CRN_NEED_DESC;

switch (TO_CIRCUIT(circ)->purpose) { case CIRCUIT_PURPOSE_C_HSDIR_GET: @@ -2253,7 +2251,7 @@ choose_good_exit_server(origin_circuit_t *circ, int need_uptime, if (is_internal) /* pick it like a middle hop */ return router_choose_random_node(NULL, options->ExcludeNodes, flags); else - return choose_good_exit_server_general(need_uptime,need_capacity); + return choose_good_exit_server_general(flags); case CIRCUIT_PURPOSE_C_ESTABLISH_REND: { /* Pick a new RP */ @@ -2378,15 +2376,22 @@ onion_pick_cpath_exit(origin_circuit_t *circ, extend_info_t *exit_ei, extend_info_describe(exit_ei)); exit_ei = extend_info_dup(exit_ei); } else { /* we have to decide one */ + router_crn_flags_t flags = CRN_NEED_DESC; + if (state->need_uptime) + flags |= CRN_NEED_UPTIME; + if (state->need_capacity) + flags |= CRN_NEED_CAPACITY; + if (is_hs_v3_rp_circuit) + flags |= CRN_RENDEZVOUS_V3; + if (state->onehop_tunnel) + flags |= CRN_DIRECT_CONN; const node_t *node = - choose_good_exit_server(circ, state->need_uptime, - state->need_capacity, state->is_internal, - is_hs_v3_rp_circuit); + choose_good_exit_server(circ, flags, state->is_internal); if (!node) { log_warn(LD_CIRC,"Failed to choose an exit server"); return -1; } - exit_ei = extend_info_from_node(node, 0); + exit_ei = extend_info_from_node(node, state->onehop_tunnel); if (BUG(exit_ei == NULL)) return -1; }