def test_skip_over_domain_name(self):
# test skip over name at beginning, end up on ^
# 4test5cisco3com0^
bytes = bytearray(b'\x04\x74\x65\x73\x74\x05\x63\x69\x73\x63'
b'\x6f\x03\x63\x6f\x6d\x00\x5e')
pos = DnsPacket.skip_over_domain_name(bytes, 0)
self.assertEqual(16, pos)
self.assertEqual('^', chr(bytes[pos]))
# test skip over name in the middle, end up on ^
# 2552552552554test5cisco3com0^
bytes = bytearray(b'\xff\xff\xff\xff\x04\x74\x65\x73\x74\x05\x63'
b'\x69\x73\x63\x6f\x03\x63\x6f\x6d\x00\x5e')
pos = DnsPacket.skip_over_domain_name(bytes, 4)
self.assertEqual(20, pos)
self.assertEqual('^', chr(bytes[pos]))
# test skip over length and pointer at beginning, end up on ^
bytes = bytearray(b'\xc0\x55\x5e')
pos = DnsPacket.skip_over_domain_name(bytes, 0)
self.assertEqual(2, pos)
self.assertEqual('^', chr(bytes[pos]))
# test skip over length and pointer in the middle, end up on ^
bytes = bytearray(b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xc0\x55\x5e')
pos = DnsPacket.skip_over_domain_name(bytes, 9)
self.assertEqual(11, pos)
self.assertEqual('^', chr(bytes[pos]))
def test_parse(self):
# test regular DNS request
line = ('84 a5 01 00 00 01 00 00 00 00 00 00 06 72 '
'65 64 68 61 74 03 63 6f 6d 00 00 01 00 01')
buf = bytearray.fromhex(line)
pkt = DnsPacket.parse(buf, 28)
self.assertEqual(0x84a5, pkt.get_msgid())
self.assertTrue(pkt.isreq)
self.assertEqual(0, pkt.arcnt)
self.assertEqual(0, pkt.optlen)
self.assertEqual(28, pkt.txt_insert_pos)
# test DNS request with EDNS0
line = ('81 71 01 20 00 01 00 00 00 00 00 01 06 72 65 '
'64 68 61 74 03 63 6f 6d 00 00 01 00 01 00 00 '
'29 10 00 00 00 00 00 00 00')
buf = bytearray.fromhex(line)
pkt = DnsPacket.parse(buf, 38)
self.assertEqual(0x8171, pkt.get_msgid())
self.assertTrue(pkt.isreq)
self.assertEqual(1, pkt.arcnt)
self.assertEqual(10, pkt.optlen)
self.assertEqual(28, pkt.txt_insert_pos)
# test regular DNS response
line = ('b6 5e 81 80 00 01 00 01 00 00 00 00 06 72 65 '
'64 68 61 74 03 63 6f 6d 00 00 01 00 01 c0 0c '
'00 01 00 01 00 00 00 08 00 04 d1 84 b7 69')
buf = bytearray.fromhex(line)
pkt = DnsPacket.parse(buf, 44)
self.assertEqual(0xb65e, pkt.get_msgid())
self.assertFalse(pkt.isreq)
self.assertEqual(0, pkt.arcnt)
self.assertEqual(0, pkt.optlen)
self.assertEqual(-1, pkt.txt_insert_pos)
def test_data(self):
# call with regular DNS request
line = ('84 a5 01 00 00 01 00 00 00 00 00 00 06 72 '
'65 64 68 61 74 03 63 6f 6d 00 00 01 00 01')
buf = bytearray.fromhex(line)
pktbuf = bytearray(4096)
pktbuf[0:len(buf)] = buf
pkt = DnsPacket.parse(pktbuf, 28)
pkt.set_viewid('123456')
mod_buf = pkt.data()
self.assertEqual(pkt.arcnt, 1)
hextxtstr = hexlify(DnsPacket.TXT_RR)
hexstr = hexlify(mod_buf)
self.assertNotEqual(-1, hexstr.find(hextxtstr))
# call with DNS request with EDNS0
line = ('81 71 01 20 00 01 00 00 00 00 00 01 06 72 65 '
'64 68 61 74 03 63 6f 6d 00 00 01 00 01 00 00 '
'29 10 00 00 00 00 00 00 00')
buf = bytearray.fromhex(line)
pktbuf = bytearray(4096)
pktbuf[0:len(buf)] = buf
pkt = DnsPacket.parse(pktbuf, 38)
pkt.set_viewid('123456')
mod_buf = pkt.data()
self.assertEqual(2, pkt.arcnt)
hexstr = hexlify(mod_buf)
self.assertNotEqual(-1, hexstr.find(hextxtstr))
def test_skip_over_domain_name(self):
# test skip over name at beginning, end up on ^
# 4test5cisco3com0^
bytes = bytearray(b'\x04\x74\x65\x73\x74\x05\x63\x69\x73\x63'
b'\x6f\x03\x63\x6f\x6d\x00\x5e')
pos = DnsPacket.skip_over_domain_name(bytes, 0)
self.assertEqual(16, pos)
self.assertEqual('^', chr(bytes[pos]))
# test skip over name in the middle, end up on ^
# 2552552552554test5cisco3com0^
bytes = bytearray(b'\xff\xff\xff\xff\x04\x74\x65\x73\x74\x05\x63'
b'\x69\x73\x63\x6f\x03\x63\x6f\x6d\x00\x5e')
pos = DnsPacket.skip_over_domain_name(bytes, 4)
self.assertEqual(20, pos)
self.assertEqual('^', chr(bytes[pos]))
# test skip over length and pointer at beginning, end up on ^
bytes = bytearray(b'\xc0\x55\x5e')
pos = DnsPacket.skip_over_domain_name(bytes, 0)
self.assertEqual(2, pos)
self.assertEqual('^', chr(bytes[pos]))
# test skip over length and pointer in the middle, end up on ^
bytes = bytearray(b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xc0\x55\x5e')
pos = DnsPacket.skip_over_domain_name(bytes, 9)
self.assertEqual(11, pos)
self.assertEqual('^', chr(bytes[pos]))
def test_data(self):
# call with regular DNS request
line = ('84 a5 01 00 00 01 00 00 00 00 00 00 06 72 '
'65 64 68 61 74 03 63 6f 6d 00 00 01 00 01')
buf = bytearray.fromhex(line)
pktbuf = bytearray(4096)
pktbuf[0:len(buf)] = buf
pkt = DnsPacket.parse(pktbuf, 28)
pkt.set_viewid('123456')
mod_buf = pkt.data()
self.assertEqual(pkt.arcnt, 1)
hextxtstr = hexlify(DnsPacket.TXT_RR)
hexstr = hexlify(mod_buf)
self.assertNotEqual(-1, hexstr.find(hextxtstr))
# call with DNS request with EDNS0
line = ('81 71 01 20 00 01 00 00 00 00 00 01 06 72 65 '
'64 68 61 74 03 63 6f 6d 00 00 01 00 01 00 00 '
'29 10 00 00 00 00 00 00 00')
buf = bytearray.fromhex(line)
pktbuf = bytearray(4096)
pktbuf[0:len(buf)] = buf
pkt = DnsPacket.parse(pktbuf, 38)
pkt.set_viewid('123456')
mod_buf = pkt.data()
self.assertEqual(2, pkt.arcnt)
hexstr = hexlify(mod_buf)
self.assertNotEqual(-1, hexstr.find(hextxtstr))
def test_parse(self):
# test regular DNS request
line = ('84 a5 01 00 00 01 00 00 00 00 00 00 06 72 '
'65 64 68 61 74 03 63 6f 6d 00 00 01 00 01')
buf = bytearray.fromhex(line)
pkt = DnsPacket.parse(buf, 28)
self.assertEqual(0x84a5, pkt.get_msgid())
self.assertTrue(pkt.isreq)
self.assertEqual(0, pkt.arcnt)
self.assertEqual(0, pkt.optlen)
self.assertEqual(28, pkt.txt_insert_pos)
# test DNS request with EDNS0
line = ('81 71 01 20 00 01 00 00 00 00 00 01 06 72 65 '
'64 68 61 74 03 63 6f 6d 00 00 01 00 01 00 00 '
'29 10 00 00 00 00 00 00 00')
buf = bytearray.fromhex(line)
pkt = DnsPacket.parse(buf, 38)
self.assertEqual(0x8171, pkt.get_msgid())
self.assertTrue(pkt.isreq)
self.assertEqual(1, pkt.arcnt)
self.assertEqual(10, pkt.optlen)
self.assertEqual(28, pkt.txt_insert_pos)
# test regular DNS response
line = ('b6 5e 81 80 00 01 00 01 00 00 00 00 06 72 65 '
'64 68 61 74 03 63 6f 6d 00 00 01 00 01 c0 0c '
'00 01 00 01 00 00 00 08 00 04 d1 84 b7 69')
buf = bytearray.fromhex(line)
pkt = DnsPacket.parse(buf, 44)
self.assertEqual(0xb65e, pkt.get_msgid())
self.assertFalse(pkt.isreq)
self.assertEqual(0, pkt.arcnt)
self.assertEqual(0, pkt.optlen)
self.assertEqual(-1, pkt.txt_insert_pos)
def test_set_viewid(self):
pkt = DnsPacket()
pkt.set_viewid('123456789')
self.assertEqual(pkt.viewid, '123456789')
def test_set_viewid(self):
pkt = DnsPacket()
pkt.set_viewid('123456789')
self.assertEqual(pkt.viewid, '123456789')
