OS X 开机 sudo 启动 python 脚本防 DNS 劫持，脚本在这里 https://github.com/linkerlin/BlackHolePy
我用一个 shell 脚本来带 python 如下

!/bin/sh

cd /Users/Megabits/BlackHolePy-master/
python dnsproxy.py

然后在 /Library/LaunchAgents/ 中放了 plist 用于开机启动
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN"
"http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Label</key><string>com.dns</string>
<key>Program</key><string>/Users/Megabits/BlackHolePy-master/run.sh</string>
<key>KeepAlive</key><true/>
<key>NetworkState</key><true/>
<key>StandardErrorPath</key><string>/var/log/system.log</string>
<key>LaunchOnlyOnce</key><true/>
</dict>
</plist>
开机虽然脚本启动了，但是本地 DNS 服务器不生效，求解啊