def _create_hdrs(self):
"""
Create headers for a SCION packet
"""
dest = SCIONAddr.from_values(self.remote, SVCType.SB_A)
cmn_hdr, addr_hdr = build_base_hdrs(self.addr, dest)
payload = SIBRAPayload.from_values()
udp_hdr = SCIONUDPHeader.from_values(self.addr, self._port, dest, 0)
return cmn_hdr, addr_hdr, udp_hdr, payload
def _create_reg_pkt(self, type_, remote=False):
if remote:
dst_ia = self.remote
path = self.seg.get_path(True)
else:
dst_ia = self.addr.isd_as
path = SCIONPath()
pcb = self._create_reg_pcb(remote)
pld = PathRecordsReg.from_values({type_: [pcb]})
dest = SCIONAddr.from_values(dst_ia, SVCType.PS_A)
cmn_hdr, addr_hdr = build_base_hdrs(self.addr, dest)
udp_hdr = SCIONUDPHeader.from_values(self.addr, self._port, dest, 0)
return SCIONL4Packet.from_values(cmn_hdr, addr_hdr, path, [], udp_hdr,
pld)
def _build_packet(self, dst_host=None, path=None, ext_hdrs=(),
dst_ia=None, payload=None, dst_port=0):
if dst_host is None:
dst_host = HostAddrNone()
if dst_ia is None:
dst_ia = self.addr.isd_as
if path is None:
path = SCIONPath()
if payload is None:
payload = PayloadRaw()
dst_addr = SCIONAddr.from_values(dst_ia, dst_host)
cmn_hdr, addr_hdr = build_base_hdrs(dst_addr, self.addr)
udp_hdr = SCIONUDPHeader.from_values(
self.addr, self._port, dst_addr, dst_port)
return SCIONL4Packet.from_values(
cmn_hdr, addr_hdr, path, ext_hdrs, udp_hdr, payload)
def _create_l4_hdr(self):
return SCIONUDPHeader.from_values(self.addr, self.sock.port, self.dst,
self.dport)