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Detailed specification of protocol in version 00000402
======================================================
CMC = 2 byte Cache Miss Counter, increased every time it is used
Version:
Client sends:
First byte v or V
Rest encoded with base32:
4 bytes big endian protocol version
CMC
Server replies:
4 chars:
VACK (version ok), followed by login challenge
VNAK (version differs), followed by server protocol version
VFUL (server has no free slots), followed by max users
4 byte value: means login challenge/server protocol version/max users
1 byte userid of the new user, or any byte if not VACK
Login:
Client sends:
First byte l or L
Rest encoded with base32:
1 byte userid
16 bytes MD5 hash of: (first 32 bytes of password) xor (8 repetitions of login challenge)
CMC
Server replies:
LNAK means not accepted
x.x.x.x-y.y.y.y-mtu means accepted (server ip, client ip, mtu)
Case check:
Client sends:
First byte z or Z
Lots of data that should not be decoded
Server replies:
The requested domain copied raw
Data:
Data header:
321 0
+---+-+
|UUU|L|
+---+-+
UUU = Userid
L = Last fragment in packet flag
First byte is the header, 4 bits coded as hex in ASCII.
Followed by data encoded with Base32.
Ping:
Client sends:
First byte p or P
Rest encoded with Base32:
1 byte userid
CMC
The server response to Ping and Data packets is a DNS NULL type response:
If server has nothing to send, data length is 0 bytes.
If server has a packet to send, data length is set and the data is a full raw
unencoded ip packet, prefixed with 32 bits tun data.
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