from unittest import TestCase, main

from scapy.layers.l2 import Ether, Dot1Q

from common.frameio.frameio import BpfProgramFilter


class TestBpf(TestCase):

    def test_bpf1(self):
        vid = 4090
        pcp = 7
        frame_match = 'ether[14:2] = 0x{:01x}{:03x}'.format(pcp << 1, vid)
        filter = BpfProgramFilter(frame_match)
        self.assertTrue(filter(str(Ether()/Dot1Q(prio=pcp, vlan=vid))))
        self.assertFalse(filter(str(Ether()/Dot1Q(prio=pcp, vlan=4000))))

    def test_bpf2(self):
        vid1 = 4090
        pcp1 = 7
        frame_match_case1 = 'ether[14:2] = 0x{:01x}{:03x}'.format(
            pcp1 << 1, vid1)

        vid2 = 4000
        frame_match_case2 = '(ether[14:2] & 0xfff) = 0x{:03x}'.format(vid2)

        filter = BpfProgramFilter('{} or {}'.format(
            frame_match_case1, frame_match_case2))
        self.assertTrue(filter(str(Ether()/Dot1Q(prio=pcp1, vlan=vid1))))
        self.assertTrue(filter(str(Ether()/Dot1Q(vlan=vid2))))
        self.assertFalse(filter(str(Ether()/Dot1Q(vlan=4001))))


if __name__ == '__main__':
    main()