diff options
Diffstat (limited to 'scripts/external_libs/dpkt-1.8.6/dpkt/ip.py')
| -rw-r--r-- | scripts/external_libs/dpkt-1.8.6/dpkt/ip.py | 301 |
1 files changed, 301 insertions, 0 deletions
diff --git a/scripts/external_libs/dpkt-1.8.6/dpkt/ip.py b/scripts/external_libs/dpkt-1.8.6/dpkt/ip.py new file mode 100644 index 00000000..a8f9bd96 --- /dev/null +++ b/scripts/external_libs/dpkt-1.8.6/dpkt/ip.py @@ -0,0 +1,301 @@ +# $Id: ip.py 87 2013-03-05 19:41:04Z andrewflnr@gmail.com $ + +"""Internet Protocol.""" + +import dpkt + +class IP(dpkt.Packet): + __hdr__ = ( + ('v_hl', 'B', (4 << 4) | (20 >> 2)), + ('tos', 'B', 0), + ('len', 'H', 20), + ('id', 'H', 0), + ('off', 'H', 0), + ('ttl', 'B', 64), + ('p', 'B', 0), + ('sum', 'H', 0), + ('src', '4s', '\x00' * 4), + ('dst', '4s', '\x00' * 4) + ) + _protosw = {} + opts = '' + + def _get_v(self): return self.v_hl >> 4 + def _set_v(self, v): self.v_hl = (v << 4) | (self.v_hl & 0xf) + v = property(_get_v, _set_v) + + def _get_hl(self): return self.v_hl & 0xf + def _set_hl(self, hl): self.v_hl = (self.v_hl & 0xf0) | hl + hl = property(_get_hl, _set_hl) + + def __len__(self): + return self.__hdr_len__ + len(self.opts) + len(self.data) + + def __str__(self): + if self.sum == 0: + self.sum = dpkt.in_cksum(self.pack_hdr() + self.opts) + if (self.p == 6 or self.p == 17) and \ + (self.off & (IP_MF|IP_OFFMASK)) == 0 and \ + isinstance(self.data, dpkt.Packet) and self.data.sum == 0: + # Set zeroed TCP and UDP checksums for non-fragments. + p = str(self.data) + s = dpkt.struct.pack('>4s4sxBH', self.src, self.dst, + self.p, len(p)) + s = dpkt.in_cksum_add(0, s) + s = dpkt.in_cksum_add(s, p) + self.data.sum = dpkt.in_cksum_done(s) + if self.p == 17 and self.data.sum == 0: + self.data.sum = 0xffff # RFC 768 + # XXX - skip transports which don't need the pseudoheader + return self.pack_hdr() + self.opts + str(self.data) + + def unpack(self, buf): + dpkt.Packet.unpack(self, buf) + ol = ((self.v_hl & 0xf) << 2) - self.__hdr_len__ + if ol < 0: + raise dpkt.UnpackError, 'invalid header length' + self.opts = buf[self.__hdr_len__:self.__hdr_len__ + ol] + if self.len: + buf = buf[self.__hdr_len__ + ol:self.len] + else: # very likely due to TCP segmentation offload + buf = buf[self.__hdr_len__ + ol:] + try: + self.data = self._protosw[self.p](buf) + setattr(self, self.data.__class__.__name__.lower(), self.data) + except (KeyError, dpkt.UnpackError): + self.data = buf + + def set_proto(cls, p, pktclass): + cls._protosw[p] = pktclass + set_proto = classmethod(set_proto) + + def get_proto(cls, p): + return cls._protosw[p] + get_proto = classmethod(get_proto) + +# Type of service (ip_tos), RFC 1349 ("obsoleted by RFC 2474") +IP_TOS_DEFAULT = 0x00 # default +IP_TOS_LOWDELAY = 0x10 # low delay +IP_TOS_THROUGHPUT = 0x08 # high throughput +IP_TOS_RELIABILITY = 0x04 # high reliability +IP_TOS_LOWCOST = 0x02 # low monetary cost - XXX +IP_TOS_ECT = 0x02 # ECN-capable transport +IP_TOS_CE = 0x01 # congestion experienced + +# IP precedence (high 3 bits of ip_tos), hopefully unused +IP_TOS_PREC_ROUTINE = 0x00 +IP_TOS_PREC_PRIORITY = 0x20 +IP_TOS_PREC_IMMEDIATE = 0x40 +IP_TOS_PREC_FLASH = 0x60 +IP_TOS_PREC_FLASHOVERRIDE = 0x80 +IP_TOS_PREC_CRITIC_ECP = 0xa0 +IP_TOS_PREC_INTERNETCONTROL = 0xc0 +IP_TOS_PREC_NETCONTROL = 0xe0 + +# Fragmentation flags (ip_off) +IP_RF = 0x8000 # reserved +IP_DF = 0x4000 # don't fragment +IP_MF = 0x2000 # more fragments (not last frag) +IP_OFFMASK = 0x1fff # mask for fragment offset + +# Time-to-live (ip_ttl), seconds +IP_TTL_DEFAULT = 64 # default ttl, RFC 1122, RFC 1340 +IP_TTL_MAX = 255 # maximum ttl + +# Protocol (ip_p) - http://www.iana.org/assignments/protocol-numbers +IP_PROTO_IP = 0 # dummy for IP +IP_PROTO_HOPOPTS = IP_PROTO_IP # IPv6 hop-by-hop options +IP_PROTO_ICMP = 1 # ICMP +IP_PROTO_IGMP = 2 # IGMP +IP_PROTO_GGP = 3 # gateway-gateway protocol +IP_PROTO_IPIP = 4 # IP in IP +IP_PROTO_ST = 5 # ST datagram mode +IP_PROTO_TCP = 6 # TCP +IP_PROTO_CBT = 7 # CBT +IP_PROTO_EGP = 8 # exterior gateway protocol +IP_PROTO_IGP = 9 # interior gateway protocol +IP_PROTO_BBNRCC = 10 # BBN RCC monitoring +IP_PROTO_NVP = 11 # Network Voice Protocol +IP_PROTO_PUP = 12 # PARC universal packet +IP_PROTO_ARGUS = 13 # ARGUS +IP_PROTO_EMCON = 14 # EMCON +IP_PROTO_XNET = 15 # Cross Net Debugger +IP_PROTO_CHAOS = 16 # Chaos +IP_PROTO_UDP = 17 # UDP +IP_PROTO_MUX = 18 # multiplexing +IP_PROTO_DCNMEAS = 19 # DCN measurement +IP_PROTO_HMP = 20 # Host Monitoring Protocol +IP_PROTO_PRM = 21 # Packet Radio Measurement +IP_PROTO_IDP = 22 # Xerox NS IDP +IP_PROTO_TRUNK1 = 23 # Trunk-1 +IP_PROTO_TRUNK2 = 24 # Trunk-2 +IP_PROTO_LEAF1 = 25 # Leaf-1 +IP_PROTO_LEAF2 = 26 # Leaf-2 +IP_PROTO_RDP = 27 # "Reliable Datagram" proto +IP_PROTO_IRTP = 28 # Inet Reliable Transaction +IP_PROTO_TP = 29 # ISO TP class 4 +IP_PROTO_NETBLT = 30 # Bulk Data Transfer +IP_PROTO_MFPNSP = 31 # MFE Network Services +IP_PROTO_MERITINP = 32 # Merit Internodal Protocol +IP_PROTO_SEP = 33 # Sequential Exchange proto +IP_PROTO_3PC = 34 # Third Party Connect proto +IP_PROTO_IDPR = 35 # Interdomain Policy Route +IP_PROTO_XTP = 36 # Xpress Transfer Protocol +IP_PROTO_DDP = 37 # Datagram Delivery Proto +IP_PROTO_CMTP = 38 # IDPR Ctrl Message Trans +IP_PROTO_TPPP = 39 # TP++ Transport Protocol +IP_PROTO_IL = 40 # IL Transport Protocol +IP_PROTO_IP6 = 41 # IPv6 +IP_PROTO_SDRP = 42 # Source Demand Routing +IP_PROTO_ROUTING = 43 # IPv6 routing header +IP_PROTO_FRAGMENT = 44 # IPv6 fragmentation header +IP_PROTO_RSVP = 46 # Reservation protocol +IP_PROTO_GRE = 47 # General Routing Encap +IP_PROTO_MHRP = 48 # Mobile Host Routing +IP_PROTO_ENA = 49 # ENA +IP_PROTO_ESP = 50 # Encap Security Payload +IP_PROTO_AH = 51 # Authentication Header +IP_PROTO_INLSP = 52 # Integated Net Layer Sec +IP_PROTO_SWIPE = 53 # SWIPE +IP_PROTO_NARP = 54 # NBMA Address Resolution +IP_PROTO_MOBILE = 55 # Mobile IP, RFC 2004 +IP_PROTO_TLSP = 56 # Transport Layer Security +IP_PROTO_SKIP = 57 # SKIP +IP_PROTO_ICMP6 = 58 # ICMP for IPv6 +IP_PROTO_NONE = 59 # IPv6 no next header +IP_PROTO_DSTOPTS = 60 # IPv6 destination options +IP_PROTO_ANYHOST = 61 # any host internal proto +IP_PROTO_CFTP = 62 # CFTP +IP_PROTO_ANYNET = 63 # any local network +IP_PROTO_EXPAK = 64 # SATNET and Backroom EXPAK +IP_PROTO_KRYPTOLAN = 65 # Kryptolan +IP_PROTO_RVD = 66 # MIT Remote Virtual Disk +IP_PROTO_IPPC = 67 # Inet Pluribus Packet Core +IP_PROTO_DISTFS = 68 # any distributed fs +IP_PROTO_SATMON = 69 # SATNET Monitoring +IP_PROTO_VISA = 70 # VISA Protocol +IP_PROTO_IPCV = 71 # Inet Packet Core Utility +IP_PROTO_CPNX = 72 # Comp Proto Net Executive +IP_PROTO_CPHB = 73 # Comp Protocol Heart Beat +IP_PROTO_WSN = 74 # Wang Span Network +IP_PROTO_PVP = 75 # Packet Video Protocol +IP_PROTO_BRSATMON = 76 # Backroom SATNET Monitor +IP_PROTO_SUNND = 77 # SUN ND Protocol +IP_PROTO_WBMON = 78 # WIDEBAND Monitoring +IP_PROTO_WBEXPAK = 79 # WIDEBAND EXPAK +IP_PROTO_EON = 80 # ISO CNLP +IP_PROTO_VMTP = 81 # Versatile Msg Transport +IP_PROTO_SVMTP = 82 # Secure VMTP +IP_PROTO_VINES = 83 # VINES +IP_PROTO_TTP = 84 # TTP +IP_PROTO_NSFIGP = 85 # NSFNET-IGP +IP_PROTO_DGP = 86 # Dissimilar Gateway Proto +IP_PROTO_TCF = 87 # TCF +IP_PROTO_EIGRP = 88 # EIGRP +IP_PROTO_OSPF = 89 # Open Shortest Path First +IP_PROTO_SPRITERPC = 90 # Sprite RPC Protocol +IP_PROTO_LARP = 91 # Locus Address Resolution +IP_PROTO_MTP = 92 # Multicast Transport Proto +IP_PROTO_AX25 = 93 # AX.25 Frames +IP_PROTO_IPIPENCAP = 94 # yet-another IP encap +IP_PROTO_MICP = 95 # Mobile Internet Ctrl +IP_PROTO_SCCSP = 96 # Semaphore Comm Sec Proto +IP_PROTO_ETHERIP = 97 # Ethernet in IPv4 +IP_PROTO_ENCAP = 98 # encapsulation header +IP_PROTO_ANYENC = 99 # private encryption scheme +IP_PROTO_GMTP = 100 # GMTP +IP_PROTO_IFMP = 101 # Ipsilon Flow Mgmt Proto +IP_PROTO_PNNI = 102 # PNNI over IP +IP_PROTO_PIM = 103 # Protocol Indep Multicast +IP_PROTO_ARIS = 104 # ARIS +IP_PROTO_SCPS = 105 # SCPS +IP_PROTO_QNX = 106 # QNX +IP_PROTO_AN = 107 # Active Networks +IP_PROTO_IPCOMP = 108 # IP Payload Compression +IP_PROTO_SNP = 109 # Sitara Networks Protocol +IP_PROTO_COMPAQPEER = 110 # Compaq Peer Protocol +IP_PROTO_IPXIP = 111 # IPX in IP +IP_PROTO_VRRP = 112 # Virtual Router Redundancy +IP_PROTO_PGM = 113 # PGM Reliable Transport +IP_PROTO_ANY0HOP = 114 # 0-hop protocol +IP_PROTO_L2TP = 115 # Layer 2 Tunneling Proto +IP_PROTO_DDX = 116 # D-II Data Exchange (DDX) +IP_PROTO_IATP = 117 # Interactive Agent Xfer +IP_PROTO_STP = 118 # Schedule Transfer Proto +IP_PROTO_SRP = 119 # SpectraLink Radio Proto +IP_PROTO_UTI = 120 # UTI +IP_PROTO_SMP = 121 # Simple Message Protocol +IP_PROTO_SM = 122 # SM +IP_PROTO_PTP = 123 # Performance Transparency +IP_PROTO_ISIS = 124 # ISIS over IPv4 +IP_PROTO_FIRE = 125 # FIRE +IP_PROTO_CRTP = 126 # Combat Radio Transport +IP_PROTO_CRUDP = 127 # Combat Radio UDP +IP_PROTO_SSCOPMCE = 128 # SSCOPMCE +IP_PROTO_IPLT = 129 # IPLT +IP_PROTO_SPS = 130 # Secure Packet Shield +IP_PROTO_PIPE = 131 # Private IP Encap in IP +IP_PROTO_SCTP = 132 # Stream Ctrl Transmission +IP_PROTO_FC = 133 # Fibre Channel +IP_PROTO_RSVPIGN = 134 # RSVP-E2E-IGNORE +IP_PROTO_RAW = 255 # Raw IP packets +IP_PROTO_RESERVED = IP_PROTO_RAW # Reserved +IP_PROTO_MAX = 255 + +# XXX - auto-load IP dispatch table from IP_PROTO_* definitions +def __load_protos(): + g = globals() + for k, v in g.iteritems(): + if k.startswith('IP_PROTO_'): + name = k[9:].lower() + try: + mod = __import__(name, g) + except ImportError: + continue + IP.set_proto(v, getattr(mod, name.upper())) + +if not IP._protosw: + __load_protos() + +if __name__ == '__main__': + import unittest + + class IPTestCase(unittest.TestCase): + def test_IP(self): + import udp + s = 'E\x00\x00"\x00\x00\x00\x00@\x11r\xc0\x01\x02\x03\x04\x01\x02\x03\x04\x00o\x00\xde\x00\x0e\xbf5foobar' + ip = IP(id=0, src='\x01\x02\x03\x04', dst='\x01\x02\x03\x04', p=17) + u = udp.UDP(sport=111, dport=222) + u.data = 'foobar' + u.ulen += len(u.data) + ip.data = u + ip.len += len(u) + self.failUnless(str(ip) == s) + + ip = IP(s) + self.failUnless(str(ip) == s) + self.failUnless(ip.udp.sport == 111) + self.failUnless(ip.udp.data == 'foobar') + + def test_hl(self): + s = 'BB\x03\x00\x00\x00\x00\x00\x00\x00\xd0\x00\xec\xbc\xa5\x00\x00\x00\x03\x80\x00\x00\xd0\x01\xf2\xac\xa5"0\x01\x00\x14\x00\x02\x00\x0f\x00\x00\x00\x00\x00\x00\x00\x00\x00' + try: + ip = IP(s) + except dpkt.UnpackError: + pass + + def test_opt(self): + s = '\x4f\x00\x00\x50\xae\x08\x00\x00\x40\x06\x17\xfc\xc0\xa8\x0a\x26\xc0\xa8\x0a\x01\x07\x27\x08\x01\x02\x03\x04\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' + ip = IP(s) + ip.sum = 0 + self.failUnless(str(ip) == s) + + def test_zerolen(self): + import tcp + d = 'X' * 2048 + s = 'E\x00\x00\x004\xce@\x00\x80\x06\x00\x00\x7f\x00\x00\x01\x7f\x00\x00\x01\xccN\x0c8`\xff\xc6N_\x8a\x12\x98P\x18@):\xa3\x00\x00' + d + ip = IP(s) + self.failUnless(isinstance(ip.data, tcp.TCP)) + self.failUnless(ip.tcp.data == d) + + unittest.main() |