server: compatible to old handshake protocol #8812
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jackysp
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Dec 25, 2018
imtbkcat
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lysu
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Dec 26, 2018
server/conn.go
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| var resp handshakeResponse41 | ||
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| pos, err := parseHandshakeResponseHeader(&resp, data) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| if err == mysql.ErrMalformPacket { |
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Protocol::HandshakeResponse41:
Handshake Response Packet sent by 4.1+ clients supporting CLIENT_PROTOCOL_41 capability, if the server announced it in its Initial Handshake Packet. Otherwise (talking to an old server) the Protocol::HandshakeResponse320 packet must be used.
https://dev.mysql.com/doc/internals/en/connection-phase-packets.html
@imtbkcat can we direct use CLIENT_PROTOCOL_41 capability to decide use 41 or 32, because our Initial Handshake Packet always contain ClientProtocol41?
parse handshake twice has risk
jackysp
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Dec 26, 2018
server/conn.go
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| // parseHandshakeResponseHeader parses the common header of SSLRequest and HandshakeResponse41. | ||
| func parseHandshakeResponseHeader(packet *handshakeResponse41, data []byte) (parsedBytes int, err error) { | ||
| // Ensure there are enough data to read: | ||
| // http://dev.mysql.com/doc/internals/en/connection-phase-packets.html#packet-Protocol::SSLRequest | ||
| if len(data) < 4+4+1+23 { | ||
| log.Errorf("Got malformed handshake response, packet data: %v", data) |
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It's better to add it back if we don't parse protocol 41 first.
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imtbkcat
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imtbkcat
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What problem does this PR solve?
When using HAProxy connect to TiDB server,
option mysql-check user rootwill cause handshake fail error because TiDB do not support Protocol::HandshakeResponse320What is changed and how it works?
Parser
Protocol::HandshakeResponse320toProtocol::HandshakeResponse41, which is supported by TiDB.Check List
Tests
Code changes
Side effects
Related changes
This change is