Signed-off-by: yusheng <[email protected]>

Co-authored-by: xjasonlyu <[email protected]>

This reverts commit 2c51a656858b264b6968e3591c4d227725df7d99.

As a low-level networking tool, tun2socks should be able to handle UDP packets of all possible sizes. This reverts commit fb9ca959095eb53c21bafd09676d58a32aca1eed.

All errors should be returned by copyBuffer and handled by higher level functions.

Co-authored-by: xjasonlyu <[email protected]>

* Default UDP relay buffer size: 16KiB

* Add tun pre/post script
* Improve: pre & post tun

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Co-authored-by: xjasonlyu <[email protected]>