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87 lines
2.4 KiB
Plaintext
87 lines
2.4 KiB
Plaintext
Detailed specification of protocol in version 00000403
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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 raw
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bits per encoded byte
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Server sends:
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Name of codec if accepted. After this all upstream data packets must
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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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Upstream data header (encoded as 4 bytes Base32):
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4321 0 432 10 43 210 4321 0
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+----+-+---+--+--+---+----+-+
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|UUUU|L|SSS|FF|FF|DDD|GGGG|C|
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+----+-+---+--+--+---+----+-+
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Downstream data header:
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7 654 3210 765 4321 0
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+-+---+----+---+----+-+
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|L|SSS|FFFF|DDD|GGGG|C|
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+-+---+----+---+----+-+
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UUUU = Userid
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L = Last fragment in packet flag
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SSS = Upstream packet sequence number
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FFFF = Upstream fragment number
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DDD = Downstream packet sequence number
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GGGG = Downstream fragment number
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C = Compression enabled for this packet
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Upstream data packet starts with 4 bytes Base32 encoded header, then comes
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the payload data, encoded with chosen codec.
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Downstream data starts with 2 byte header. Then payload data, which may be
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compressed.
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Ping:
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Client sends:
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First byte p or P
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Rest encoded with Base32:
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1 byte userid
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CMC
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The server response 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 something to send, it will send a downstream data packet,
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prefixed with 2 bytes header as shown above.
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