New 'DisableNetwork' option to prevent Tor from using the network

Some controllers want this so they can mess with Tor's configuration
for a while via the control port before actually letting Tor out of
the house.

We do this with a new DisableNetwork option, that prevents Tor from
making any outbound connections or binding any non-control
listeners.  Additionally, it shuts down the same functionality as
shuts down when we are hibernating, plus the code that launches
directory downloads.

To make sure I didn't miss anything, I added a clause straight to
connection_connect, so that we won't even try to open an outbound
socket when the network is disabled.  In my testing, I made this an
assert, but since I probably missed something, I've turned it into a
BUG warning for testing.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/or/connection.h b/src/or/connection.h
index 9f11489727..c4b8bf8abe 100644
--- a/src/or/connection.h
+++ b/src/or/connection.h
@@ -66,6 +66,9 @@ int get_proxy_addrport(tor_addr_t *addr, uint16_t *port, int *proxy_type,
 int retry_all_listeners(smartlist_t *replaced_conns,
                         smartlist_t *new_conns);
 
+void connection_mark_all_noncontrol_listeners(void);
+void connection_mark_all_noncontrol_connections(void);
+
 ssize_t connection_bucket_write_limit(connection_t *conn, time_t now);
 int global_write_bucket_low(connection_t *conn, size_t attempt, int priority);
 void connection_bucket_init(void);