fix:public DNS not set in macos, tun+fake-ip

scripts/unset_dns.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+nic=$(route -n get default | grep "interface" | awk '{print $2}')
+
+hardware_port=$(networksetup -listallhardwareports | awk -v dev="$nic" '
+    /Hardware Port:/{
+        port=$0; gsub("Hardware Port: ", "", port)
+    } 
+    /Device: /{
+        if ($2 == dev) {
+            print port; 
+            exit
+        }
+    }
+')
+
+if [ -f original_dns.txt ]; then
+    original_dns=$(cat original_dns.txt)
+else
+    original_dns=$(networksetup -getdnsservers "$hardware_port")
+fi
+
+networksetup -setdnsservers "$hardware_port" $original_dns