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128 lines
3.4 KiB
Python
128 lines
3.4 KiB
Python
from hachoir.field import FieldSet, Field, Bits
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from hachoir.core.bits import str2hex
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from hachoir.parser.network.ouid import REGISTERED_OUID
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from hachoir.core.endian import BIG_ENDIAN
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from socket import gethostbyaddr, herror as socket_host_error
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def ip2name(addr):
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if not ip2name.resolve:
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return addr
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try:
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if addr in ip2name.cache:
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return ip2name.cache[addr]
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# FIXME: Workaround Python bug
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# Need double try/except to catch the bug
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try:
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name = gethostbyaddr(addr)[0]
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except KeyboardInterrupt:
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raise
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except (socket_host_error, ValueError):
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name = addr
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except (socket_host_error, KeyboardInterrupt, ValueError):
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ip2name.resolve = False
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name = addr
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ip2name.cache[addr] = name
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return name
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ip2name.cache = {}
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ip2name.resolve = True
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class IPv4_Address(Field):
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def __init__(self, parent, name, description=None):
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Field.__init__(self, parent, name, 32, description)
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def createValue(self):
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value = self._parent.stream.readBytes(self.absolute_address, 4)
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return ".".join("%u" % byte for byte in value)
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def createDisplay(self):
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return ip2name(self.value)
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class IPv6_Address(Field):
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def __init__(self, parent, name, description=None):
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Field.__init__(self, parent, name, 128, description)
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def createValue(self):
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value = self._parent.stream.readBits(
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self.absolute_address, 128, self.parent.endian)
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parts = []
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for index in range(8):
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part = "%04x" % (value & 0xffff)
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value >>= 16
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parts.append(part)
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return ':'.join(reversed(parts))
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def createDisplay(self):
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return self.value
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class OrganizationallyUniqueIdentifier(Bits):
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"""
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IEEE 24-bit Organizationally unique identifier
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"""
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static_size = 24
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def __init__(self, parent, name, description=None):
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Bits.__init__(self, parent, name, 24, description=None)
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def createDisplay(self, human=True):
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if human:
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key = self.value
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if key in REGISTERED_OUID:
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return REGISTERED_OUID[key]
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else:
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return self.raw_display
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else:
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return self.raw_display
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def createRawDisplay(self):
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value = self.value
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a = value >> 16
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b = (value >> 8) & 0xFF
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c = value & 0xFF
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return "%02X-%02X-%02X" % (a, b, c)
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class NIC24(Bits):
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static_size = 24
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def __init__(self, parent, name, description=None):
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Bits.__init__(self, parent, name, 24, description=None)
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def createDisplay(self):
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value = self.value
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a = value >> 16
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b = (value >> 8) & 0xFF
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c = value & 0xFF
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return "%02x:%02x:%02x" % (a, b, c)
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def createRawDisplay(self):
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return "0x%06X" % self.value
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class MAC48_Address(FieldSet):
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"""
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IEEE 802 48-bit MAC address
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"""
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static_size = 48
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endian = BIG_ENDIAN
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def createFields(self):
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yield OrganizationallyUniqueIdentifier(self, "organization")
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yield NIC24(self, "nic")
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def hasValue(self):
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return True
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def createValue(self):
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bytes = self.stream.readBytes(self.absolute_address, 6)
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return str2hex(bytes, format="%02x:")[:-1]
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def createDisplay(self):
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return "%s [%s]" % (self["organization"].display, self["nic"].display)
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