if your ORPort is non-zero then you must connect to all nodes
if your DirPort is non-zero then you must act like a directory server


svn:r192

svn:r174

If you weren't connected to a given router, and you made a directory
request to it simultaneously with a new web query that caused you to
want to connect to that OR... it would think you're already connected.


svn:r135

svn:r132

svn:r123

prkey is only fetched when it's needed
tor nodes who aren't dirservers now fetch directories and autoconnect
  to new nodes listed in the directory
default role is a non-dirserver node


svn:r120

if connecting to a dirserver fails, remove it from the router array


svn:r113

proxies now periodically pull down an hourly-updated directory,
and replace their router list with it if it parses correctly.


svn:r112