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$Id$
Special Hostnames in Tor
Nick Mathewson
1. Overview
Most of the time, Tor treats user-specified hostnames as opaque: When the
user connects to tor.eff.org, Tor picks an exit node and uses that node to
connect to "tor.eff.org". Some hostnames, however, can be used to override
Tor's default behavior and circuit-building rules.
These hostnames can be passed to Tor as the address part of a SOCKS4a or
SOCKS5 request. If the application is connected to Tor using an IP-only
method (such as SOCKS4, TransPort, or NatdPort), these hostnames can be
substituted for certain IP addresses using the MapAddress configuration
option or the MAPADDRESS control command.
2. .exit
SYNTAX: [hostname].[name-or-digest].exit
[name-or-digest].exit
Hostname is a valid hostname; [name-or-digest] is either the nickname of a
Tor node or the hex-encoded digest of that node's public key.
When Tor sees an address in this format, it uses the specified hostname as
the exit node. If no "hostname" component is given, Tor defaults to the
published IPv4 address of the exit node.
It is valid to try to resolve hostnames
EXAMPLES:
www.example.com.exampletornode.exit
Connect to www.example.com from the node called "exampletornode."
exampletornode.exit
Connect to the published IP address of "exampletornode" using
"exampletornode" as the exit.
3. .onion
SYNTAX [digest].onion
The digest is the first eighty bits of a SHA1 hash of the identity key for
a hidden service, encoded in base32.
When Tor sees an address in this format, it tries to look up and connect to
the specified hidden service. See rend-spec.txt for full details.
4. .noconnect
SYNTAX: [string].noconnect
When Tor sees an address in this format, it immediately closes the
connection without attaching it to any circuit. This is useful for
controllers that want to test whether a given application is indeed using
the same instance of Tor that they're controlling.
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