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Update changelog and proto docs
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@ -16,6 +16,8 @@ CHANGES:
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does not include localhost.
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- The client will now exit if configuring IP or MTU fails.
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- The starting cache miss value is randomized at startup, fixes #65.
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- Raw UDP mode added. If the iodined server is reachable directly,
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packets can be sent to it without DNS encoding. Fixes #36.
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2009-06-01: 0.5.2 "WifiFree"
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- Fixed client segfault on OS X, #57
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@ -3,6 +3,8 @@ Detailed specification of protocol in version 00000501
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Note: work in progress!!
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======================================================
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1. DNS protocol
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======================================================
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CMC = 2 byte Cache Miss Counter, increased every time it is used
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@ -125,3 +127,31 @@ 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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======================================================
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2. Raw UDP protocol
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======================================================
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All Raw UDP protcol messages start with a 3 byte header: 0x10d19e
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This is not the start of a valid DNS message so it is easy to identify.
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The fourth byte contains the command and the user id.
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7654 3210
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+----+----+
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|CCCC|UUUU|
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+----+----+
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Login message (command = 1):
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The header is followed by a MD5 hash with the same password as in the DNS
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login. The client starts the raw mode by sending this message, and uses
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the login challenge +1, and the server responds using the login challenge -1.
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After the login message has been exchanged, both the server and the client
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switch to raw udp mode for the rest of the connection.
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Data message (command = 2):
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After the header comes the payload data, which may be compressed.
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Ping message (command = 3):
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Sent from client to server and back to keep session open. Has no payload.
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