Build and test most of the machinery needed for IPv6 virtualaddrmaps

With an IPv6 virtual address map, we can basically hand out a new
IPv6 address for _every_ address we connect to.  That'll be cool, and
will let us maybe get around prop205 issues.

This uses some fancy logic to try to make the code paths in the ipv4
and the ipv6 case as close as possible, and moves to randomly
generated addresses so we don't need to maintain those stupid counters
that will collide if Tor restarts but apps don't.

Also has some XXXX items to fix to make this useful. More design
needed.

1 files changed, 6 insertions, 3 deletions

diff --git a/src/or/control.c b/src/or/control.c
index 75c9af6f7b..65689c46dd 100644
--- a/src/or/control.c
+++ b/src/or/control.c
@@ -1373,10 +1373,13 @@ handle_control_mapaddress(control_connection_t *conn, uint32_t len,
                      "512-syntax error: invalid address '%s'", to);
         log_warn(LD_CONTROL,
                  "Skipping invalid argument '%s' in MapAddress msg", to);
-      } else if (!strcmp(from, ".") || !strcmp(from, "0.0.0.0")) {
+      } else if (!strcmp(from, ".") || !strcmp(from, "0.0.0.0") ||
+                 !strcmp(from, "::")) {
+        const char type =
+          !strcmp(from,".") ? RESOLVED_TYPE_HOSTNAME :
+          (!strcmp(from, "0.0.0.0") ? RESOLVED_TYPE_IPV4 : RESOLVED_TYPE_IPV6);
         const char *address = addressmap_register_virtual_address(
-              !strcmp(from,".") ? RESOLVED_TYPE_HOSTNAME : RESOLVED_TYPE_IPV4,
-               tor_strdup(to));
+                                                     type, tor_strdup(to));
         if (!address) {
           smartlist_add_asprintf(reply,
                        "451-resource exhausted: skipping '%s'", line);