FlamiNAS protocol

C: Single line sent from client to server
S> Single line sent from server to client

== Establishing a connection
Server opens tcp listening socket using winsock or berkeley socket
Client connects to server
Server accepts connection

== Requesting server name and version
C: INFO
S> INFO
S> FlamiNAS v1.2.potato

== Requesting directory listing
The list ends with a blank line, so we don't
need to send the number of files to the client
C: DIR C:\Test
S> DIR C:\Test
S> 123 1389828846 C:\Test\file one        # first field: file length in bytes
S> 512 1389828866 C:\Test\file two        # second field: unix timestamp, last modified
S> 8124 1389828878 C:\Test\file three     # third field until newline: current filename
S> 1823429 1389828887 C:\Test\file four

== Requesting and downloading a file
C: GET C:\Test\file one
S> GET C:\Test\file one                   # repeat command to confirm
S> 123 1389828846                         # file length and last modified
S> (flush file from fd to socket)         # stream the contents

== Uploading a file to the server
  (note that we need to include the lastmodified timestamp,
   so the server can store the same timestamp after download completed)

C: PUT 123 1389830542 C:\Test\file one    # Sending 123 bytes
S> PUT 123 1389830542 C:\Test\file one    # Confirm downloading 123 bytes
C: (flush file from fd to socket)
S> GOT 123 1389830542 C:\Test\file one


== Deleting a file from the server
C: DEL C:\Test\file one
S> DEL C:\Test\file one

== Renaming a file on the server
C: REN C:\Test\file one               # command and old filename
C: C:\Test\pile one                   # new filename
S> REN C:\Test\pile one               # confirm new filename





== Syncing will occur in a large number of steps, follow these in ordeer
   First things first:

Client connects
Server accepts

== Getting the full list of files on server
C: TREE C:\FlamiNAS
S> (same answer as DIR but also include contents of all subfolders)


== The following steps are all on CLIENT, since
   we have all knowledge of all files on server

== First step:

   Find all files in TREE that are on server, but not on client.
   Find all files in TREE that are on client, but not on server.

   Compare files from both lists, see whether some have
   matching file size or LastModified.

   Send DEL command for all files that are only on server,
   and did not match any size/lastmod on client

   Send PUT command for all files that are only on client,
   and did not match any size/lastmod on server

   For each file with different names but with matching
   file size AND lastmodified, request MD5sum from server:
C: MD5 C:\FlamiNAS\fascinating
S> MD5 C:\FlamiNAS\fascinating
S> 2e867426f51530ede645297b5dd7d090

   Compare checksum with local:
     Send REN command if they match.
     Send PUT command if mismatch.