Move specification documents into new doc/spec subdirectory. (Proposals, drafts, and bad ideas still remain in doc.)

svn:r9411

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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, and in fact upon success Tor
+  will cache an internal mapaddress of the form
+  "www.google.com.foo.exit=64.233.161.99.foo.exit" to speed subsequent
+  lookups.
+
+  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.
+