Read auth_data_len from InitialHandshake packet instead of hard code #640
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Btw, when syncer receive an EOF Packet, it's means that user set 'BINLOG_DUMP_NON_BLOCK' flag in COM_BINLOG_DUMP command and there is no more binlog event now. master will send this Packet instead of blocking |
lance6716
reviewed
Nov 15, 2021
client/auth.go
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| // auth_data is end with 0x00, max data length is 13 + 8 = 21 | ||
| // ref to https://dev.mysql.com/doc/internals/en/connection-phase-packets.html#packet-Protocol::Handshake | ||
| maxAuthDataLen := 21 | ||
| if c.capability&CLIENT_PLUGIN_AUTH != 0 && int(data[pos]) < maxAuthDataLen { |
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if int(data[pos]) is 9, resetOfAuthDataEndPos will equals pos. But as stated $len=MAX(13, length of auth-plugin-data - 8) in https://dev.mysql.com/doc/internals/en/connection-phase-packets.html#packet-Protocol::Handshake, resetOfAuthDataEndPos should be pos + 13 - 1?
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sorry, it's my fault. it's min_auth_data_len is 21, not max_data_len.
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and this pr is a little bit old, need to be updated :-)
lance6716
approved these changes
Nov 15, 2021
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Now
When Fake Slave receive initialHandshake packet from Master, it'll decodes this packet. The current implementation uses hard-coded methods to obtain auth_data_part_2.
Change
But actually we can get auth_data_len from initHandshake packet. We can use the same method to get auth_plugin_name(ref to MySQL Doc)
Test
I've tested this change with my local MySQL, it's ok