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# $Id: icmp.py 45 2007-08-03 00:05:22Z jon.oberheide $
"""Internet Control Message Protocol."""
import dpkt, ip
# Types (icmp_type) and codes (icmp_code) -
# http://www.iana.org/assignments/icmp-parameters
ICMP_CODE_NONE = 0 # for types without codes
ICMP_ECHOREPLY = 0 # echo reply
ICMP_UNREACH = 3 # dest unreachable, codes:
ICMP_UNREACH_NET = 0 # bad net
ICMP_UNREACH_HOST = 1 # bad host
ICMP_UNREACH_PROTO = 2 # bad protocol
ICMP_UNREACH_PORT = 3 # bad port
ICMP_UNREACH_NEEDFRAG = 4 # IP_DF caused drop
ICMP_UNREACH_SRCFAIL = 5 # src route failed
ICMP_UNREACH_NET_UNKNOWN = 6 # unknown net
ICMP_UNREACH_HOST_UNKNOWN = 7 # unknown host
ICMP_UNREACH_ISOLATED = 8 # src host isolated
ICMP_UNREACH_NET_PROHIB = 9 # for crypto devs
ICMP_UNREACH_HOST_PROHIB = 10 # ditto
ICMP_UNREACH_TOSNET = 11 # bad tos for net
ICMP_UNREACH_TOSHOST = 12 # bad tos for host
ICMP_UNREACH_FILTER_PROHIB = 13 # prohibited access
ICMP_UNREACH_HOST_PRECEDENCE = 14 # precedence error
ICMP_UNREACH_PRECEDENCE_CUTOFF = 15 # precedence cutoff
ICMP_SRCQUENCH = 4 # packet lost, slow down
ICMP_REDIRECT = 5 # shorter route, codes:
ICMP_REDIRECT_NET = 0 # for network
ICMP_REDIRECT_HOST = 1 # for host
ICMP_REDIRECT_TOSNET = 2 # for tos and net
ICMP_REDIRECT_TOSHOST = 3 # for tos and host
ICMP_ALTHOSTADDR = 6 # alternate host address
ICMP_ECHO = 8 # echo service
ICMP_RTRADVERT = 9 # router advertise, codes:
ICMP_RTRADVERT_NORMAL = 0 # normal
ICMP_RTRADVERT_NOROUTE_COMMON = 16 # selective routing
ICMP_RTRSOLICIT = 10 # router solicitation
ICMP_TIMEXCEED = 11 # time exceeded, code:
ICMP_TIMEXCEED_INTRANS = 0 # ttl==0 in transit
ICMP_TIMEXCEED_REASS = 1 # ttl==0 in reass
ICMP_PARAMPROB = 12 # ip header bad
ICMP_PARAMPROB_ERRATPTR = 0 # req. opt. absent
ICMP_PARAMPROB_OPTABSENT = 1 # req. opt. absent
ICMP_PARAMPROB_LENGTH = 2 # bad length
ICMP_TSTAMP = 13 # timestamp request
ICMP_TSTAMPREPLY = 14 # timestamp reply
ICMP_INFO = 15 # information request
ICMP_INFOREPLY = 16 # information reply
ICMP_MASK = 17 # address mask request
ICMP_MASKREPLY = 18 # address mask reply
ICMP_TRACEROUTE = 30 # traceroute
ICMP_DATACONVERR = 31 # data conversion error
ICMP_MOBILE_REDIRECT = 32 # mobile host redirect
ICMP_IP6_WHEREAREYOU = 33 # IPv6 where-are-you
ICMP_IP6_IAMHERE = 34 # IPv6 i-am-here
ICMP_MOBILE_REG = 35 # mobile registration req
ICMP_MOBILE_REGREPLY = 36 # mobile registration reply
ICMP_DNS = 37 # domain name request
ICMP_DNSREPLY = 38 # domain name reply
ICMP_SKIP = 39 # SKIP
ICMP_PHOTURIS = 40 # Photuris
ICMP_PHOTURIS_UNKNOWN_INDEX = 0 # unknown sec index
ICMP_PHOTURIS_AUTH_FAILED = 1 # auth failed
ICMP_PHOTURIS_DECOMPRESS_FAILED = 2 # decompress failed
ICMP_PHOTURIS_DECRYPT_FAILED = 3 # decrypt failed
ICMP_PHOTURIS_NEED_AUTHN = 4 # no authentication
ICMP_PHOTURIS_NEED_AUTHZ = 5 # no authorization
ICMP_TYPE_MAX = 40
class ICMP(dpkt.Packet):
__hdr__ = (
('type', 'B', 8),
('code', 'B', 0),
('sum', 'H', 0)
)
class Echo(dpkt.Packet):
__hdr__ = (('id', 'H', 0), ('seq', 'H', 0))
class Quote(dpkt.Packet):
__hdr__ = (('pad', 'I', 0),)
def unpack(self, buf):
dpkt.Packet.unpack(self, buf)
self.data = self.ip = ip.IP(self.data)
class Unreach(Quote):
__hdr__ = (('pad', 'H', 0), ('mtu', 'H', 0))
class Quench(Quote):
pass
class Redirect(Quote):
__hdr__ = (('gw', 'I', 0),)
class ParamProbe(Quote):
__hdr__ = (('ptr', 'B', 0), ('pad1', 'B', 0), ('pad2', 'H', 0))
class TimeExceed(Quote):
pass
_typesw = { 0:Echo, 3:Unreach, 4:Quench, 5:Redirect, 8:Echo,
11:TimeExceed }
def unpack(self, buf):
dpkt.Packet.unpack(self, buf)
try:
self.data = self._typesw[self.type](self.data)
setattr(self, self.data.__class__.__name__.lower(), self.data)
except (KeyError, dpkt.UnpackError):
pass
def __str__(self):
if not self.sum:
self.sum = dpkt.in_cksum(dpkt.Packet.__str__(self))
return dpkt.Packet.__str__(self)
if __name__ == '__main__':
import unittest
class ICMPTestCase(unittest.TestCase):
def test_ICMP(self):
s = '\x03\x0a\x6b\x19\x00\x00\x00\x00\x45\x00\x00\x28\x94\x1f\x00\x00\xe3\x06\x99\xb4\x23\x2b\x24\x00\xde\x8e\x84\x42\xab\xd1\x00\x50\x00\x35\xe1\x29\x20\xd9\x00\x00\x00\x22\x9b\xf0\xe2\x04\x65\x6b'
icmp = ICMP(s)
self.failUnless(str(icmp) == s)
unittest.main()
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