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How do I create a new service for firewalld from the commandline programmatically?

I cannot find an option to firewall-cmd that allows me to do this. Am I just missing it or does it actually not exist? In case of the latter, is there another option? I know that you can create a .xml service file, but I am looking for a cleaner (less error prone) way to create a service file.

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According to this FedoraForum thread, it can't be done at the moment.

However, in the very same thread, this post explain a possible workaround using a python script importing firewalld bindings.

In short:

python -c "import firewall.core.io.service as ios
s=ios.Service() #Creates a service object
s.short = 'My Matlab Service' #A short description
s.name = 'matlab' #this defines the name of the xml file
s.ports = [('1234', 'tcp'), ('12345', 'udp')] #A list of ports
ios.service_writer(s, '/etc/firewalld/services')"

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