def encode_name(self,name):
"""
Encode label and store at end of buffer (compressing
cached elements where needed) and store elements
in 'names' dict
"""
if not isinstance(name,DNSLabel):
name = DNSLabel(name)
if len(name) > 253:
raise DNSLabelError("Domain label too long: %r" % name)
name = list(name.label)
while name:
if tuple(name) in self.names:
# Cached - set pointer
pointer = self.names[tuple(name)]
pointer = set_bits(pointer,3,14,2)
self.pack("!H",pointer)
return
else:
self.names[tuple(name)] = self.offset
element = name.pop(0)
if len(element) > 63:
raise DNSLabelError("Label component too long: %r" % element)
self.pack("!B",len(element))
self.append(element)
self.append(b'\x00')
def set_rcode(self, val):
self.bitmap = set_bits(self.bitmap, val, 0, 4)
def set_ra(self, val):
self.bitmap = set_bits(self.bitmap, val, 7)
def set_rd(self, val):
self.bitmap = set_bits(self.bitmap, val, 8)
def set_tc(self, val):
self.bitmap = set_bits(self.bitmap, val, 9)
def set_aa(self, val):
self.bitmap = set_bits(self.bitmap, val, 10)
def set_opcode(self, val):
self.bitmap = set_bits(self.bitmap, val, 11, 4)
def set_qr(self, val):
self.bitmap = set_bits(self.bitmap, val, 15)
def set_rcode(self,val):
self.bitmap = set_bits(self.bitmap,val,0,4)
def set_ra(self,val):
self.bitmap = set_bits(self.bitmap,val,7)
def set_rd(self,val):
self.bitmap = set_bits(self.bitmap,val,8)
def set_tc(self,val):
self.bitmap = set_bits(self.bitmap,val,9)
def set_aa(self,val):
self.bitmap = set_bits(self.bitmap,val,10)
def set_opcode(self,val):
self.bitmap = set_bits(self.bitmap,val,11,4)
def set_qr(self,val):
self.bitmap = set_bits(self.bitmap,val,15)