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Document choose_random_entry_impl() and populate_live_entry_guards().

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This commit is contained in:
George Kadianakis 2014-06-15 19:02:35 -07:00
parent bf263a9b99
commit 61629b4f6c
1 changed files with 37 additions and 3 deletions
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40
src/or/entrynodes.c
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@ -997,8 +997,25 @@ 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. */
/** Filter <b>all_entry_guards</b> for usable entry guards and put them
* in <b>live_entry_guards</b>. We filter based on whether the node is
* currently alive, and on whether it satisfies the restrictions
* imposed by the other arguments of this function.
*
* We don't place more guards than NumEntryGuards in <b>live_entry_guards</b>.
*
* If <b>chosen_exit</b> is set, it contains the exit node of this
* circuit. Make sure to not use it or its family as an entry guard.
*
* If <b>need_uptime</b> is set, we are looking for a stable entry guard.
* if <b>need_capacity</b> is set, we are looking for a fast entry guard.
*
* The rest of the arguments are the same as in choose_random_entry_impl().
*
* Return 1 if we should choose a guard right away. Return 0 if we
* should try to add more nodes to our list before deciding on a
* guard.
*/
STATIC int
populate_live_entry_guards(smartlist_t *live_entry_guards,
const smartlist_t *all_entry_guards,
@ -1058,7 +1075,24 @@ populate_live_entry_guards(smartlist_t *live_entry_guards,
return retval;
}
/** Helper for choose_random{entry,dirguard}. */
/** Pick a node to be used as the entry guard of a circuit.
*
* If <b>state</b> is set, it contains the information we know about
* the upcoming circuit.
*
* If <b>for_directory</b> is set, we are looking for a directory guard.
*
* <b>dirinfo_type</b> contains the kind of directory information we
* are looking for in our node.
*
* If <b>n_options_out</b> is set, we set it to the number of
* candidate guard nodes we had before picking a specific guard node.
*
* On success, return the node that should be used as the entry guard
* of the circuit. Return NULL if no such node could be found.
*
* Helper for choose_random{entry,dirguard}.
*/
static const node_t *
choose_random_entry_impl(cpath_build_state_t *state, int for_directory,
dirinfo_type_t dirinfo_type, int *n_options_out)