finish off a bunch of rend todo, add more

svn:r1500

doc/TODO

@@ -105,36 +105,46 @@ Rendezvous service:
               can be in.) [NM]
             o Add circuit metadata [NM]
         o Code to configure hidden services [NM] 4 hours
-        - a section in the README (or its own README): how to configure
-          hidden services
         o Service descriptors
             o OPs need to maintain identity keys for hidden services [NM]
             o Code to generate and parse service descriptors [NM]
-        . Advertisement
+        o Advertisement
             o Generate y.onion hostnames [NM]
                 o Store y.onion hostnames to disk. [NM]
             o Code to do an HTTP connection over Tor from within Tor [RD]
-            . Publish service descriptors to directory [RD]
+            o Publish service descriptors to directory [RD]
             o Directory accepts and remembers service descriptors, and
               delivers them as requested
                 o Frontend [RD]
                 o Backend [NM]
-            . Code for OPs to retrieve (and cache?) service descriptors [RD]
-        - Rendezvous
-            - Code as needed to generate and parse all rendezvous-related
+            o Code for OPs to retrieve (and cache?) service descriptors [RD]
+        o Rendezvous
+            o Code as needed to generate and parse all rendezvous-related
               cell types, and do all handshaking [NM]
-            - ORs implement introduction points
-            - OPs with hidden services establish introduction points
-            - ORs implement rendezvous points
-            - OPs notice y.onion URLs, and:
-                - Retrieve service descriptors
-                - Establish rendezvous points
-                - Send introduction requests to introduction points
-        - Communication
-            - OPs remember which circuits are used for which rendezvous
+            o ORs implement introduction points
+            o OPs with hidden services establish introduction points
+            o ORs implement rendezvous points
+            o OPs notice y.onion URLs, and:
+                o Retrieve service descriptors
+                o Establish rendezvous points
+                o Send introduction requests to introduction points
+        o Communication
+            o OPs remember which circuits are used for which rendezvous
               points, and can look up circuits by location-hidden service
             - OPs send/handle BEGIN cells for location-hidden services
-            - End-to-end communication for location-hidden services
+            . End-to-end communication for location-hidden services
+        - a section in the man pages: how to configure hidden services
+        - let bob use himself as a rendezvous point
+        - let bob replenish his intro points and republish
+        - alice retries introduction and rendezvous a few times?
+        - should alice ever try to refresh her service desc cache entries?
+        - race condition: alice has the serverdesc in her cache, she opens
+          the circs, serverdesc expires and is flushed, then she goes
+          to send the intro cell. should serverdesc cache have a
+          last-touched field? are there better fixes?
+        - backward compatibility: when only certain nodes know about rend
+          protocol, how do we deal? have nodes parse the tor version field?
+          force an upgrade? simply be more robust against useless nodes?
 
 On-going
         . Better comments for functions!