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add Cisco syntax for /32 host entries #19

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add Cisco syntax for /32 host entries #19

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2 changes: 2 additions & 0 deletions src/netom/filters.py
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Original file line number Diff line number Diff line change
Expand Up @@ -115,6 +115,8 @@ def address_to_wildcard(addr):
https://medium.com/opsops/wildcard-masks-operations-in-python-16acf1c35683
"""
ipnet4 = ipaddress.ip_network(addr)
if ipnet4.prefixlen == 32:
return f"host {ipnet4.network_address}"
wildcard = str(IPv4Address(int(IPv4Address(ipnet4.netmask))^(2**32-1)))
return f"{ipnet4.network_address} {wildcard}"

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4 changes: 2 additions & 2 deletions tests/test_filters.py
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,7 @@ def test_address_to_wildcard():
assert address_to_wildcard("192.168.0.0/25") == "192.168.0.0 0.0.0.127"
assert address_to_wildcard("192.168.0.0/30") == "192.168.0.0 0.0.0.3"
assert address_to_wildcard("192.168.0.0/31") == "192.168.0.0 0.0.0.1"
assert address_to_wildcard("192.168.0.0/32") == "192.168.0.0 0.0.0.0"
assert address_to_wildcard("192.168.0.0/32") == "host 192.168.0.0"

def test_line_to_mask():
assert line_to_mask("ip route 192.168.0.0/4 198.51.100.1") == "ip route 192.168.0.0 240.0.0.0 198.51.100.1"
Expand All @@ -44,4 +44,4 @@ def test_line_to_wildcard():
assert line_to_wildcard("permit tcp 192.168.0.0/25 any eq 22") == "permit tcp 192.168.0.0 0.0.0.127 any eq 22"
assert line_to_wildcard("permit tcp 192.168.0.0/30 any eq 22") == "permit tcp 192.168.0.0 0.0.0.3 any eq 22"
assert line_to_wildcard("permit tcp 192.168.0.0/31 any eq 22") == "permit tcp 192.168.0.0 0.0.0.1 any eq 22"
assert line_to_wildcard("permit tcp 192.168.0.0/32 any eq 22") == "permit tcp 192.168.0.0 0.0.0.0 any eq 22"
assert line_to_wildcard("permit tcp 192.168.0.0/32 any eq 22") == "permit tcp host 192.168.0.0 any eq 22"