firewallios-simulatormacos
How can I block internet access to a specific application in Mac OS X? I need this to be done from the command line and hopefully use the ipfw terminal command.
Specifically I am looking to toggle the internet connection on and off in the iPhone simulator application since there is no airplane mode.
Apple’s official tool to slow down the network connections on you Mac for testing purposes is Network Link Conditioner
Additionally, iOS has similar function accessible from within Xcode and iOS 6 or later.
Older versions of Xcode before version 4.3.2 embedded a copy of this tool. This SO thread documents some history of the tool in a similar manner to the iOS simulators and developer documentation.
There are 11 built in profiles from a Lossy Edge network with 400ms delay to a cable modem. If you need other limits, you can create custom profiles with your own settings or you can also use ipfw yourself as described in Craig Hockenberry's article slow ride, make it easy It also mentions the Speed Limit panel by Mike Schrag that is a smaller download than Xcode, but has fewer options than Apple's tool.
It slows down the entire network stack, so you can't throttle on a per app basis without doing things like install lion in a virtual machine and set that VM with a throttled stack.
See OSX Daily - Enable and Disable AirPort Wireless from the Command Line in Mac OS X. Quote:
Turn Airport Off via Command Line
networksetup -setairportpower airport offTurn Airport On via Command Line
networksetup -setairportpower airport onYou won’t see any confirmation in the Terminal that the command succeeded or failed, but if you watch the AirPort menu icon you will see the bars disappear indicating the wireless interface is turned off, or reappear indicating that wireless is activated again.
NOTE: In OS X Lion, use the hardware name above instead of airport,
e.g. networksetup -setairportpower en1 off.
Best Answer
You can use the Lulu open-source macOS firewall that aims to block unknown outgoing connections, unless explicitly approved by the user. Whilst it has a GUI, the set of blocked applications can be controlled via the command line by modifying the config file
/Library/Objective-See/LuLu/rules.plistas explained in the Lulu webpage (near the bottom).