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Fix the functionality of populate_live_entry_guards().

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This commit is contained in:
George Kadianakis 2014-06-09 18:23:07 +01:00
parent 427cc8a452
commit a59429f1e4
1 changed files with 38 additions and 10 deletions
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48
src/or/entrynodes.c
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@ -995,14 +995,24 @@ choose_random_dirguard(dirinfo_type_t type)
return choose_random_entry_impl(NULL, 1, type, NULL);
}
/* DOCDOCODC
Return 1 if we should choose a guard right away. */
static int
populate_live_entry_guards(const smartlist_t *live_entry_guards,
populate_live_entry_guards(smartlist_t *live_entry_guards,
const node_t *chosen_exit,
dirinfo_type_t dirinfo_type,
int need_uptime,
int need_capacity,
int need_descriptor)
int for_directory,
int need_uptime, int need_capacity)
{
const or_options_t *options = get_options();
const node_t *node = NULL;
const int num_needed = decide_num_guards(options, for_directory);
smartlist_t *exit_family = smartlist_new();
int retval = 0;
int need_descriptor = !for_directory;
tor_assert(entry_guards);
if (chosen_exit) {
nodelist_add_node_and_family(exit_family, chosen_exit);
}
@ -1030,11 +1040,19 @@ populate_live_entry_guards(const smartlist_t *live_entry_guards,
* guard. Otherwise we might add several new ones, pick
* the second new one, and now we've expanded our entry
* guard list without needing to. */
goto choose_and_finish;
retval = 1;
goto done;
}
if (smartlist_len(live_entry_guards) >= num_needed) {
retval = 1;
goto done; /* We picked enough entry guards. Done! */
}
if (smartlist_len(live_entry_guards) >= num_needed)
goto choose_and_finish; /* we have enough */
} SMARTLIST_FOREACH_END(entry);
done:
smartlist_free(exit_family);
return retval;
}
/** Helper for choose_random{entry,dirguard}. */
@ -1044,15 +1062,14 @@ choose_random_entry_impl(cpath_build_state_t *state, int for_directory,
{
const or_options_t *options = get_options();
smartlist_t *live_entry_guards = smartlist_new();
smartlist_t *exit_family = smartlist_new();
const node_t *chosen_exit =
state?build_state_get_exit_node(state) : NULL;
const node_t *node = NULL;
int need_uptime = state ? state->need_uptime : 0;
int need_capacity = state ? state->need_capacity : 0;
int preferred_min = 0;
int need_descriptor = !for_directory;
const int num_needed = decide_num_guards(options, for_directory);
int retval = 0;
if (n_options_out)
*n_options_out = 0;
@ -1070,6 +1087,18 @@ choose_random_entry_impl(cpath_build_state_t *state, int for_directory,
retry:
smartlist_clear(live_entry_guards);
/* Populate the list of live entry guards so that we pick one of
them. */
retval = populate_live_entry_guards(live_entry_guards,
chosen_exit,
dirinfo_type,
for_directory,
need_uptime, need_capacity);
if (retval == 1) { /* We should choose a guard right now. */
goto choose_and_finish;
}
if (entry_list_is_constrained(options)) {
/* If we prefer the entry nodes we've got, and we have at least
* one choice, that's great. Use it. */
@ -1126,7 +1155,6 @@ choose_random_entry_impl(cpath_build_state_t *state, int for_directory,
if (n_options_out)
*n_options_out = smartlist_len(live_entry_guards);
smartlist_free(live_entry_guards);
smartlist_free(exit_family);
return node;
}