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"""ATA over Ethernet Protocol."""
import struct
import dpkt
class AOE(dpkt.Packet):
__hdr__ = (
('ver_fl', 'B', 0x10),
('err', 'B', 0),
('maj', 'H', 0),
('min', 'B', 0),
('cmd', 'B', 0),
('tag', 'I', 0),
)
_cmdsw = {}
def _get_ver(self): return self.ver_fl >> 4
def _set_ver(self, ver): self.ver_fl = (ver << 4) | (self.ver_fl & 0xf)
ver = property(_get_ver, _set_ver)
def _get_fl(self): return self.ver_fl & 0xf
def _set_fl(self, fl): self.ver_fl = (self.ver_fl & 0xf0) | fl
fl = property(_get_fl, _set_fl)
def set_cmd(cls, cmd, pktclass):
cls._cmdsw[cmd] = pktclass
set_cmd = classmethod(set_cmd)
def get_cmd(cls, cmd):
return cls._cmdsw[cmd]
get_cmd = classmethod(get_cmd)
def unpack(self, buf):
dpkt.Packet.unpack(self, buf)
try:
self.data = self._cmdsw[self.cmd](self.data)
setattr(self, self.data.__class__.__name__.lower(), self.data)
except (KeyError, struct.error, dpkt.UnpackError):
pass
def pack_hdr(self):
try:
return dpkt.Packet.pack_hdr(self)
except struct.error, e:
raise dpkt.PackError(str(e))
AOE_CMD_ATA = 0
AOE_CMD_CFG = 1
AOE_FLAG_RSP = 1 << 3
def __load_cmds():
prefix = 'AOE_CMD_'
g = globals()
for k, v in g.iteritems():
if k.startswith(prefix):
name = 'aoe' + k[len(prefix):].lower()
try:
mod = __import__(name, g)
except ImportError:
continue
AOE.set_cmd(v, getattr(mod, name.upper()))
if not AOE._cmdsw:
__load_cmds()
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