nihilist/tor
1
0
Fork 0
mirror of https://gitlab.torproject.org/tpo/core/tor.git synced 2024-11-30 15:43:32 +01:00
Code Issues Packages Projects Releases Wiki Activity

271: Algorithm tweak to allow multiple entry guards.

Browse Source 
Previously, we had NumEntryGuards kind of hardwired to 1.  Now we
have the code (but not the configuarability) to choose randomly from
among the first N primary guards that would work, where N defaults
to 1.

Part of 20831 support for making NumEntryGuards work again.
This commit is contained in:
Nick Mathewson 2016-12-08 12:47:29 -05:00
parent 385602e982
commit deb8bcadce
1 changed files with 15 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
src/or/entrynodes.c
View File

@ -1795,6 +1795,9 @@ select_entry_guard_for_circuit(guard_selection_t *gs,
if (!gs->primary_guards_up_to_date)
entry_guards_update_primary(gs);
int num_entry_guards = 1;
smartlist_t *usable_primary_guards = smartlist_new();
/* "If any entry in PRIMARY_GUARDS has {is_reachable} status of
<maybe> or <yes>, return the first such guard." */
SMARTLIST_FOREACH_BEGIN(gs->primary_entry_guards, entry_guard_t *, guard) {
@ -1804,12 +1807,21 @@ select_entry_guard_for_circuit(guard_selection_t *gs,
if (guard->is_reachable != GUARD_REACHABLE_NO) {
*state_out = GUARD_CIRC_STATE_USABLE_ON_COMPLETION;
guard->last_tried_to_connect = approx_time();
log_info(LD_GUARD, "Selected primary guard %s for circuit.",
entry_guard_describe(guard));
return guard;
smartlist_add(usable_primary_guards, guard);
if (smartlist_len(usable_primary_guards) >= num_entry_guards)
break;
}
} SMARTLIST_FOREACH_END(guard);
if (smartlist_len(usable_primary_guards)) {
entry_guard_t *guard = smartlist_choose(usable_primary_guards);
smartlist_free(usable_primary_guards);
log_info(LD_GUARD, "Selected primary guard %s for circuit.",
entry_guard_describe(guard));
return guard;
}
smartlist_free(usable_primary_guards);
/* "Otherwise, if the ordered intersection of {CONFIRMED_GUARDS}
and {USABLE_FILTERED_GUARDS} is nonempty, return the first
entry in that intersection that has {is_pending} set to