nyfthon : suite
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1 changed files with 29 additions and 1 deletions
30
bin/nyfthon
30
bin/nyfthon
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@ -2,9 +2,11 @@
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from nftables import Nftables
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from os import path
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import sys
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import json
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NFT = Nftables()
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NAME = path.basename(__file__)
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TABLE_NAME = "inet filter"
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def error(message, code):
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print("%s: %s" % (NAME, message), file = sys.stderr)
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@ -16,6 +18,30 @@ def error_no_arg(arg_name):
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def error_invalid_arg(arg_name, value):
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error('invalid %s "%s"' % (arg_name, value), 2)
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def usage():
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print("""
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{name}: dumb Python wrapper for nftables o_O
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usage:
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{name} list - show currently allowed ports
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{name} help - show this :)
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{name} allow|deny <protocol> <port number> - add or remove a port from the filtered sets
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""".format(name = NAME).strip())
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def get_nft_set_for(protocol):
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return json.loads(NFT.cmd("list set %s allowed_%s" % (TABLE_NAME, protocol))[1])["nftables"][1]["set"]
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def show_ports():
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NFT.set_json_output(True)
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tcp_ports = get_nft_set_for("tcp")
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udp_ports = get_nft_set_for("udp")
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if "elem" in tcp_ports:
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print("Allowed TCP ports : %s" % (tcp_ports["elem"]))
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if "elem" in udp_ports:
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print("Allowed UDP ports: %s" % (udp_ports["elem"]))
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def allowed_ports(operation, protocol, port):
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if operation != "add" and operation != "delete":
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raise ValueError("not a valid nftables operation")
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@ -26,7 +52,7 @@ def allowed_ports(operation, protocol, port):
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if port < 0 or port > 65535:
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raise ValueError("not a valid port number")
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NFT.cmd("%s element inet filter allowed_%s { %d }" % (operation, protocol, port))
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NFT.cmd("%s element %s allowed_%s { %d }" % (operation, TABLE_NAME, protocol, port))
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def manage_ports(action, args):
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match action:
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@ -70,5 +96,7 @@ if __name__ == "__main__":
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usage()
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case "allow" | "deny":
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manage_ports(action, sys.argv)
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case "list":
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show_ports()
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case _:
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error_invalid_arg("action", action)
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