2008-12-07 09:44:55 +00:00
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Detailed specification of protocol in version 00000402
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2008-12-07 09:42:19 +00:00
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======================================================
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CMC = 2 byte Cache Miss Counter, increased every time it is used
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Version:
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Client sends:
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First byte v or V
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Rest encoded with base32:
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4 bytes big endian protocol version
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CMC
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Server replies:
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4 chars:
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VACK (version ok), followed by login challenge
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VNAK (version differs), followed by server protocol version
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VFUL (server has no free slots), followed by max users
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4 byte value: means login challenge/server protocol version/max users
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1 byte userid of the new user, or any byte if not VACK
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Login:
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Client sends:
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First byte l or L
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Rest encoded with base32:
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1 byte userid
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16 bytes MD5 hash of: (first 32 bytes of password) xor (8 repetitions of login challenge)
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CMC
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Server replies:
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LNAK means not accepted
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x.x.x.x-y.y.y.y-mtu means accepted (server ip, client ip, mtu)
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Case check:
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Client sends:
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First byte z or Z
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Lots of data that should not be decoded
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Server replies:
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The requested domain copied raw
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Switch codec:
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Client sends:
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First byte s or S
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One byte ASCII digit, meaning userid
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One byte ASCII digit, with value 5 or 6, representing number of bits per byte in encoding
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Server sends:
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Name of codec if accepted. After this all upstream data packets must be encoded with the new codec.
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BADCODEC if not accepted. Client must then revert to Base32
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Data:
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Data header:
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321 0
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+---+-+
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|UUU|L|
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+---+-+
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UUU = Userid
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L = Last fragment in packet flag
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First 4 bits coded as hex in ASCII.
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Followed by data encoded with the chosen codec.
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Ping:
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Command = 0x04, User = userid
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Client sends:
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Only a CMC
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The server responses to Ping and Data packets is a DNS NULL type response:
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If server has nothing to send, data length is 0 bytes.
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If server has a packet to send, data length is set and the data is a full raw
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unencoded ip packet, prefixed with 32 bits tun data.
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