Logging
今天无意中看了一眼服务器日志，结果发现了一些奇怪的消息：
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| warning: unknown[122.168.199.151]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
warning: unknown[176.8.89.240]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
warning: unknown[185.232.21.42]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
warning: unknown[206.217.216.13]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
warning: unknown[220.196.249.145]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
warning: unknown[5.253.204.74]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
warning: unknown[70.45.212.49]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
warning: unknown[93.177.73.82]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
warning: unknown[93.177.75.66]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
|
这里的 UGFzc3dvcmQ6 是什么呢？从直觉上看似乎是个 base64 编码的字符串。解码试试看，果然：
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