Rewriting the PAC DNS Module

Rewriting the PAC DNS Module

run：

./piledriver_core_linux piledriverAddr socksAddr user passwd (selectable DNS address)

examples:

Global:
./piledriver_core_linux 1.1.1.1:443 0.0.0.0:8081 user passwd

PAC:
./piledriver_core_linux 1.1.1.1:443 0.0.0.0:8081 user passwd 8.8.8.8:53