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

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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.
This commit is contained in:
Nick Mathewson 2018-04-16 11:41:45 -04:00
parent 388d217c40
commit 7915efd1b8
1 changed files with 22 additions and 17 deletions
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39
src/or/circuitbuild.c
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@ -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;
}