def build_ack_message(self, sequence_nbr: int, ack_nbr: int) -> IpapMessage:
"""
Builds an ack to respond other messages
:param sequence_nbr: sequence number for the message
:param ack_nbr: ack number to send within the message
:return:
"""
message = IpapMessage(domain_id=int(self.domain), ipap_version=IpapMessage.IPAP_VERSION, _encode_network=True)
message.set_ack(True)
message.set_seqno(sequence_nbr)
message.set_ack_seq_no(ack_nbr)
return message
def build_fin_message(self, sequence_nbr: int, ack_nbr: int) -> IpapMessage:
"""
Builds a fin message to teardown a connection
:param sequence_nbr: sequence number for the message
:param ack_nbr: ack number to send within the message
:return: message with the fin flag set
"""
message = IpapMessage(domain_id=int(self.domain), ipap_version=IpapMessage.IPAP_VERSION, _encode_network=True)
message.set_fin(True)
message.set_seqno(sequence_nbr)
message.set_ack_seq_no(ack_nbr)
return message
def build_syn_ack_message(self, sequence_nbr: int, ack_nbr: int) -> IpapMessage:
"""
Builds an ack to respond syn_ack message
:param sequence_nbr: sequence number for the message
:param ack_nbr: ack number to send within the message
:return:
"""
print('build syn ack message {0}.{1}'.format(str(sequence_nbr), str(ack_nbr)))
message = IpapMessage(domain_id=int(self.domain), ipap_version=IpapMessage.IPAP_VERSION, _encode_network=True)
message.set_syn(True)
message.set_ack(True)
message.set_seqno(sequence_nbr)
message.set_ack_seq_no(ack_nbr)
return message