r8997@Kushana: nickm | 2006-09-28 23:40:22 -0400

[Needs review.] Add a BEGIN_DIR relay cell type for an easier
 in-protocol way to connect to directory servers through Tor.
 Previously, clients could only connect to director servers over Tor
 from exit nodes, but couldn't get directory information anonymously
 from a non-exit cache without getting a directory server involved.
 
 This needs testing, and needs client-side code to actually exercise it.
 


svn:r8527

doc/TODO

@@ -52,7 +52,7 @@ P - Figure out why openssl 0.9.8c "make test" fails at sha256t test.
 Items for 0.1.2.x:
   o re-enable blossom functionality: let tor servers decide if they
     will use local search when resolving, or not.
-N   - Document it.
+    o Document it.
   - enumerate events of important things that occur in tor, so vidalia can
     react.
 N   - Backend implementation
@@ -61,11 +61,13 @@ R   - Actually list all the events (notice and warn log messages are a good
 N   - Specify general event system
 R   - Specify actual events.
 
-N - Have (and document) a BEGIN_DIR relay cell that means "Connect to your
+N . Have (and document) a BEGIN_DIR relay cell that means "Connect to your
     directory port."
-    - Specify
-    - Implement
+    o Specify
+    o Implement
     - Use for something, so we can be sure it works.
+    - Test and debug
+
 
 x - We should ship with a list of stable dir mirrors -- they're not
     trusted like the authorities, but they'll provide more robustness

doc/tor-spec.txt

@@ -624,6 +624,7 @@ TODO:
         10 -- RELAY_DROP      [forward or backward]
         11 -- RELAY_RESOLVE   [forward]
         12 -- RELAY_RESOLVED  [backward]
+        13 -- RELAY_BEGIN_DIR [forward]
 
    Commands labelled as "forward" must only be sent by the originator
    of the circuit. Commands labelled as "backward" must only be sent by
@@ -710,6 +711,16 @@ TODO:
    Relay RELAY_DROP cells are long-range dummies; upon receiving such
    a cell, the OR or OP must drop it.
 
+6.2.1. Opening a directory stream
+
+   If a Tor server is a directory server, it should respond to a
+   RELAY_BEGIN_DIR cell as if it had received a BEGIN cell requesting a
+   connection to its directory port.  RELAY_BEGIN_DIR cells ignore exit
+   policy, since the stream is local to the Tor process.
+
+   If the Tor server is not running a directory service, it should respond
+   with a REASON_NOTDIRECTORY RELAY_END cell.
+
 6.3. Closing streams
 
    When an anonymized TCP connection is closed, or an edge node
@@ -738,6 +749,8 @@ TODO:
       12 -- REASON_CONNRESET      (Connection was unexpectedly reset)
       13 -- REASON_TORPROTOCOL    (Sent when closing connection because of
                                    Tor protocol violations.)
+      14 -- REASON_NOTDIRECTORY   (Client send RELAY_BEGIN_DIR to a
+                                   non-directory server.)
 
    (With REASON_EXITPOLICY, the 4-byte IPv4 address or 16-byte IPv6 address
    forms the optional data; no other reason currently has extra data.