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      1 # This file is part of Scapy
      2 # Scapy is free software: you can redistribute it and/or modify
      3 # it under the terms of the GNU General Public License as published by
      4 # the Free Software Foundation, either version 2 of the License, or
      5 # any later version.
      6 #
      7 # Scapy is distributed in the hope that it will be useful,
      8 # but WITHOUT ANY WARRANTY; without even the implied warranty of
      9 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
     10 # GNU General Public License for more details.
     11 #
     12 # You should have received a copy of the GNU General Public License
     13 # along with Scapy. If not, see <http://www.gnu.org/licenses/>.
     14 
     15 # scapy.contrib.description = VLAN Query Protocol
     16 # scapy.contrib.status = loads
     17 
     18 from scapy.packet import *
     19 from scapy.fields import *
     20 from scapy.layers.inet import UDP
     21 
     22 class VQP(Packet):
     23         name = "VQP"
     24         fields_desc = [
     25                 ByteField("const", 1),
     26                 ByteEnumField("type", 1, {
     27                         1:"requestPort", 2:"responseVLAN",
     28                         3:"requestReconfirm", 4:"responseReconfirm"
     29                 }),
     30                 ByteEnumField("errorcodeaction", 0, {
     31                         0:"none",3:"accessDenied",
     32                         4:"shutdownPort", 5:"wrongDomain"
     33                 }),
     34                 ByteEnumField("unknown", 2, {
     35                         2:"inGoodResponse", 6:"inRequests"
     36                 }),
     37                 IntField("seq",0),
     38         ]
     39 
     40 class VQPEntry(Packet):
     41         name = "VQPEntry"
     42         fields_desc = [
     43                 IntEnumField("datatype", 0, {
     44                         3073:"clientIPAddress", 3074:"portName",
     45                         3075:"VLANName", 3076:"Domain", 3077:"ethernetPacket",
     46                         3078:"ReqMACAddress", 3079:"unknown",
     47                         3080:"ResMACAddress"
     48                 }),
     49                 FieldLenField("len", None),
     50                 ConditionalField(IPField("datatom", "0.0.0.0"),
     51                         lambda p:p.datatype==3073),
     52                 ConditionalField(MACField("data", "00:00:00:00:00:00"),
     53                         lambda p:p.datatype==3078),
     54                 ConditionalField(MACField("data", "00:00:00:00:00:00"),
     55                         lambda p:p.datatype==3080), 
     56                 ConditionalField(StrLenField("data", None,
     57                         length_from=lambda p:p.len), 
     58                         lambda p:p.datatype not in [3073, 3078, 3080]),
     59         ]
     60         def post_build(self, p, pay):
     61                 if self.len is None:
     62                         l = len(p.data)
     63                         p = p[:2]+struct.pack("!H",l)+p[4:]
     64                 return p
     65 
     66 bind_layers(UDP,        VQP,            sport=1589)
     67 bind_layers(UDP,        VQP,            dport=1589)
     68 bind_layers(VQP,        VQPEntry,       )
     69 bind_layers(VQPEntry,   VQPEntry,       )
     70