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Workaround for CONC-417, MDEV-13492

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At irregular intervals older windows versions (prior Windows 10) fail to establish a secure (TLS)
connection and return errors SEC_E_INVALID_TOKEN, SEC_E_BUFFER_TOO_SMALL or SEC_E_MESSAGE_ALTERED.
This is a bug in windows schannel library and was only fixed in recent versions, also OpenSSL provided
a workaround (see https://github.com/openssl/openssl/pull/1350).
Since we are unable to fix this, we introduced a workaround for this problem. In case of an error
during TLS handshake we check the errorcode and try to reconnect up to three times if the error code
was SEC_E_INVALID_TOKEN, SEC_E_BUFFER_TOO_SMALL or SEC_E_MESSAGE_ALTERED.
This commit is contained in:
Georg Richter
2019-09-19 08:50:55 +02:00
parent 261a5c4355
commit de04c2e01f
4 changed files with 38 additions and 2 deletions
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include/mysql.h
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@@ -140,6 +140,7 @@ extern const char *SQLSTATE_UNKNOWN;
(a)->net.last_errno= 0;\
strcpy((a)->net.sqlstate, "00000");\
(a)->net.last_error[0]= '\0';\
(a)->net.extension->extended_errno= 0;\
}
#define MYSQL_COUNT_ERROR (~(unsigned long long) 0)