def _parse(self, addr_type, raw):
"""
Parse a raw byte string.
:param int addr_type: Host address type
:param bytes raw: raw bytes.
"""
haddr_type = haddr_get_type(addr_type)
addr_len = ISD_AS.LEN + haddr_type.LEN
data = Raw(raw, "SCIONAddr", addr_len, min_=True)
self.isd_as = ISD_AS(data.pop(ISD_AS.LEN))
self.host = haddr_type(data.pop(haddr_type.LEN))
def addr_c2py(caddr):
"""
Helper function to convert C_SCIONAddr to SCIONAddr
:param caddr: C_SCIONAddr to convert
:type caddr: C_SCIONAddr
:returns: Converted object
:rtype: SCIONAddr
"""
isd_as = ISD_AS(caddr.isd_as.to_bytes(4, 'big'))
if caddr.host.addr_type == 0:
return None
htype = haddr_get_type(caddr.host.addr_type)
haddr = haddr_parse(caddr.host.addr_type,
bytes(caddr.host.addr)[:htype.LEN])
return SCIONAddr.from_values(isd_as, haddr)
def _get_path_via_api(self):
"""
Test local API.
"""
data = self._try_sciond_api()
path_len = data.pop(1) * 8
self.path = SCIONPath(data.pop(path_len))
haddr_type = haddr_get_type(data.pop(1))
data.pop(haddr_type.LEN) # first hop, unused here
data.pop(2) # port number, unused here
self.path.mtu = struct.unpack("!H", data.pop(2))[0]
ifcount = data.pop(1)
self.iflist = []
for i in range(ifcount):
isd_as = ISD_AS(data.pop(ISD_AS.LEN))
ifid = struct.unpack("!H", data.pop(2))[0]
self.iflist.append((isd_as, ifid))
def calc_len(cls, type_): # pragma: no cover
class_ = haddr_get_type(type_)
return ISD_AS.LEN + class_.LEN
