iodine/doc/proto_00000403.txt

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Detailed specification of protocol in version 00000403
======================================================
CMC = 2 byte Cache Miss Counter, increased every time it is used
Version:
Client sends:
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First byte v or V
Rest encoded with base32:
4 bytes big endian protocol version
CMC
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Server replies:
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4 chars:
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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
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4 byte value: means login challenge/server protocol version/max users
1 byte userid of the new user, or any byte if not VACK
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Login:
Client sends:
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First byte l or L
Rest encoded with base32:
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:
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:
Client sends:
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First byte z or Z
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Lots of data that should not be decoded
Server replies:
The requested domain copied raw
Switch codec:
Client sends:
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First byte s or S
One byte ASCII digit, meaning userid
One byte ASCII digit, with value 5 or 6, representing number of raw
bits per encoded byte
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Server sends:
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:
Upstream data header (encoded as 4 bytes Base32):
4321 0 432 10 43 210 4321 0
+----+-+---+--+--+---+----+-+
|UUUU|L|SSS|FF|FF|DDD|GGGG|C|
+----+-+---+--+--+---+----+-+
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Downstream data header:
7 654 3210 765 4321 0
+-+---+----+---+----+-+
|L|SSS|FFFF|DDD|GGGG|C|
+-+---+----+---+----+-+
UUUU = Userid
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L = Last fragment in packet flag
SSS = Upstream packet sequence number
FFFF = Upstream fragment number
DDD = Downstream packet sequence number
GGGG = Downstream fragment number
C = Compression enabled for this packet
Upstream data packet starts with 4 bytes Base32 encoded header, then comes
the payload data, encoded with chosen codec.
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Downstream data starts with 2 byte header. Then payload data, which may be
compressed.
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Ping:
Client sends:
First byte p or P
Rest encoded with Base32:
1 byte userid
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.
If server has something to send, it will send a downstream data packet,
prefixed with 2 bytes header as shown above.