TODO

* socket_receiver loop should be improved
* Solaris: tunnel device should be unplumbed on program exit -> Solaris user group seems to be negligible...
* Solaris TAP device untestet -> see above
//* OpenBSD TAP device might not work (see OpenBSD man page tun(4))
//* finish SOCKS5 code for I2P
* work on header compression (start at RFC2507 or 3095)
* log connect log to OC console
//* forward multicasting packets (ff00::/8) -> I think that is stupid
//* frame checking may be improved
//* generally improve tun opening routine
//* log levels and log output are currently somehow random
* interaction with OS routing table to be able to forward packets to "foreign" networks beside the TOR prefix
//* peer list should be improved
* IPv6 routing table should be improved (is just a flat list yet)
* controller interface should be improved (is not thread-safe) -> not really should, did never hang since more than 10 years ;)
* controller interface should use basic IO and timed selects -> not very important, really necessary?
//* peer reconnections timeout should be implemented (to not reconnect to fast)
//* add Windows tunnel code
//* IPv6 adresses are not checked for their validity
//* garbage collector for packet queue missing
//* garbage collector for session cleanup
//* packets received on sockets should be validated (Ethertype, ip)
//* socks_connector queue
//* packet_forwarder depends on socks_connector, currently possible unclean startup (not dangerous) -- socks connector now is multi-threaded and not blocking on a pipe, hence, this error _should_ (i'm currently not sure) not occur anymore.
//* replace clock_gettime() by time(), no accuracy needed
//* replace all socket write()s by send()
//* licence
//* improve tun header test (check for src and dst ip)
//* create some kind of connection log
//* tun-header packet dependent
//* IPv4 forwarding + routing
//* fragment handler
//* improve getopt() -- currently many things are hardcoded
//* disconnected permanent peers are not reconnected sometimes
//* sometimes a peer is connected a second time for an unknown reason