When excluding nodes by country, exclude {??} and {A1} too

This is ticket 7706, reported by "bugcatcher."  The rationale here
is that if somebody says 'ExcludeNodes {tv}', then they probably
don't just want to block definitely Tuvaluan nodes: they also want
to block nodes that have unknown country, since for all they know
such nodes are also in Tuvalu.

This behavior is controlled by a new GeoIPExcludeUnknown autobool
option.  With the default (auto) setting, we exclude ?? and A1 if
any country is excluded.  If the option is 1, we add ?? and A1
unconditionally; if the option is 0, we never add them.

(Right now our geoip file doesn't actually seem to include A1: I'm
including it here in case it comes back.)

This feature only takes effect if you have a GeoIP file.  Otherwise
you'd be excluding every node.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/or/routerset.h b/src/or/routerset.h
index cd4a8375e8..bfa0c59ac1 100644
--- a/src/or/routerset.h
+++ b/src/or/routerset.h
@@ -31,6 +31,7 @@ int routerset_contains_node(const routerset_t *set, const node_t *node);
 void routerset_get_all_nodes(smartlist_t *out, const routerset_t *routerset,
                              const routerset_t *excludeset,
                              int running_only);
+int routerset_add_unknown_ccs(routerset_t **setp, int only_if_some_cc_set);
 #if 0
 void routersets_get_node_disjunction(smartlist_t *target,
                                 const smartlist_t *source,