Implement basic PCAP parser

[tuxuser]

PCAP parser prints basic metadata

Usage

xcloud-pcap-reader some_capture.pcap

Sample output:

TEREDO: TeredoPacket(IPv6=IPv6Packet(V=6, SRC=b' \x01\x00\x003\x8c$\xf4\x04;0\xe3\xd2\xf3\xc9=', DST=b' \x01\x00\x003\x8c$\xf4\x1c8\xf3\xfd\xd2\xf3\xc9=', PLEN=104 NEXT=17 HLIM=21), SRC=TeredoEndpoint(teredo_server_ipv4=IPv4Address('51.140.36.244'), flags=1083, udp_port=53020, client_pub_ipv4=IPv4Address('45.12.54.194')), DST=TeredoEndpoint(teredo_server_ipv4=IPv4Address('51.140.36.244'), flags=7224, udp_port=3074, client_pub_ipv4=IPv4Address('45.12.54.194')))
 -> TEREDO-WRAPPED: STUN: Message(message_method=Method.BINDING, message_class=Class.REQUEST, transaction_id=b'C\xf6B\x99\xac3\xffY&\xcdM\x8f')
TEREDO: TeredoPacket(IPv6=IPv6Packet(V=6, SRC=b' \x01\x00\x003\x8c$\xf4\x1c8\xf3\xfd\xd2\xf3\xc9=', DST=b' \x01\x00\x003\x8c$\xf4\x04;0\xe3\xd2\xf3\xc9=', PLEN=104 NEXT=17 HLIM=128), SRC=TeredoEndpoint(teredo_server_ipv4=IPv4Address('51.140.36.244'), flags=7224, udp_port=3074, client_pub_ipv4=IPv4Address('45.12.54.194')), DST=TeredoEndpoint(teredo_server_ipv4=IPv4Address('51.140.36.244'), flags=1083, udp_port=53020, client_pub_ipv4=IPv4Address('45.12.54.194')))
 -> TEREDO-WRAPPED: STUN: Message(message_method=Method.BINDING, message_class=Class.REQUEST, transaction_id=b'\x9e\xfeI?\xbcM\xd7g\xe0o%\xee')
STUN: Message(message_method=Method.BINDING, message_class=Class.REQUEST, transaction_id=b'\x86\xf4@_\xb6\xdb\xb4Xs\xe0fO')
STUN: Message(message_method=Method.BINDING, message_class=Class.REQUEST, transaction_id=b':\xe2E\xc1\xa3,\xf8n\xd0\xad\xf0n')
STUN: Message(message_method=Method.BINDING, message_class=Class.RESPONSE, transaction_id=b':\xe2E\xc1\xa3,\xf8n\xd0\xad\xf0n')
STUN: Message(message_method=Method.BINDING, message_class=Class.REQUEST, transaction_id=b's!F\xe3\xbe\xa1\x14\x16\xda{6\xbe')
STUN: Message(message_method=Method.BINDING, message_class=Class.RESPONSE, transaction_id=b's!F\xe3\xbe\xa1\x14\x16\xda{6\xbe')
RTP: UDPConnectionProbing RtpPacket(seq=0, ts=0, marker=0, payload=102, 1452 bytes) SSRC=0
RTP: UDPConnectionProbing RtpPacket(seq=1, ts=0, marker=0, payload=102, 1452 bytes) SSRC=0