Can specific exit-nodes be "turned off"?
Can groups of exit nodes be "turned off" based on top-domain and/or on location (ie. country)?
You can add an ExcludeNodes to your torrc config file.
From the manpage:
ExcludeNodes node,node,... A list of identity fingerprints, country
codes, and address patterns of nodes to avoid when building a circuit.
Country codes are 2-letter ISO3166 codes, and must be wrapped in
braces; fingerprints may be preceded by a dollar sign. (Example:
ExcludeNodes ABCD1234CDEF5678ABCD1234CDEF5678ABCD1234, {cc},
255.254.0.0/8)
By default, this option is treated as a preference that Tor is allowed
to override in order to keep working. For example, if you try to
connect to a hidden service, but you have excluded all of the hidden
service’s introduction points, Tor will connect to one of them anyway.
If you do not want this behavior, set the StrictNodes option
(documented below).
Note also that if you are a relay, this (and the other node selection
options below) only affects your own circuits that Tor builds for you.
Clients can still build circuits through you to any node. Controllers
can tell Tor to build circuits through any node.
Country codes are case-insensitive. The code "{??}" refers to nodes
whose country can’t be identified. No country code, including {??},
works if no GeoIPFile can be loaded. See also the GeoIPExcludeUnknown
option below.
Is it possible to do the above only for specific sites (maybe specified by using regular expressions); Ie. "turn it off" only when visiting sites known to be blocked, but leave them "on" for other (not blocked) sites?
As far as I know you can't do this easily.
