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Diffstat (limited to 'scripts/external_libs/scapy-python3-0.18/scapy/contrib/vtp.py')
| -rw-r--r-- | scripts/external_libs/scapy-python3-0.18/scapy/contrib/vtp.py | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/scripts/external_libs/scapy-python3-0.18/scapy/contrib/vtp.py b/scripts/external_libs/scapy-python3-0.18/scapy/contrib/vtp.py new file mode 100644 index 00000000..af5c2823 --- /dev/null +++ b/scripts/external_libs/scapy-python3-0.18/scapy/contrib/vtp.py @@ -0,0 +1,171 @@ +#!/usr/bin/env python + +# scapy.contrib.description = VLAN Trunking Protocol (VTP) +# scapy.contrib.status = loads + +""" + VTP Scapy Extension + ~~~~~~~~~~~~~~~~~~~~~ + + :version: 2009-02-15 + :copyright: 2009 by Jochen Bartl + :e-mail: lobo@c3a.de / jochen.bartl@gmail.com + :license: GPL v2 + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License + as published by the Free Software Foundation; either version 2 + of the License, or (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + :TODO + + - Join messages + - RE MD5 hash calculation + - Have a closer look at 8 byte padding in summary adv. + "debug sw-vlan vtp packets" sais the TLV length is invalid, + when I change the values + '\x00\x00\x00\x01\x06\x01\x00\x02' + * \x00\x00 ? + * \x00\x01 tlvtype? + * \x06 length? + * \x00\x02 value? + - h2i function for VTPTimeStampField + + :References: + + - Understanding VLAN Trunk Protocol (VTP) + http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080094c52.shtml +""" + +from scapy.all import * + +_VTP_VLAN_TYPE = { + 1 : 'Ethernet', + 2 : 'FDDI', + 3 : 'TrCRF', + 4 : 'FDDI-net', + 5 : 'TrBRF' + } + +_VTP_VLANINFO_TLV_TYPE = { + 0x01 : 'Source-Routing Ring Number', + 0x02 : 'Source-Routing Bridge Number', + 0x03 : 'Spanning-Tree Protocol Type', + 0x04 : 'Parent VLAN', + 0x05 : 'Translationally Bridged VLANs', + 0x06 : 'Pruning', + 0x07 : 'Bridge Type', + 0x08 : 'Max ARE Hop Count', + 0x09 : 'Max STE Hop Count', + 0x0A : 'Backup CRF Mode' + } + + +class VTPVlanInfoTlv(Packet): + name = "VTP VLAN Info TLV" + fields_desc = [ + ByteEnumField("type", 0, _VTP_VLANINFO_TLV_TYPE), + ByteField("length", 0), + StrLenField("value", None, length_from=lambda pkt : pkt.length + 1) + ] + + def guess_payload_class(self, p): + return conf.padding_layer + +class VTPVlanInfo(Packet): + name = "VTP VLAN Info" + fields_desc = [ + ByteField("len", None), # FIXME: compute length + ByteEnumField("status", 0, {0 : "active", 1 : "suspended"}), + ByteEnumField("type", 1, _VTP_VLAN_TYPE), + FieldLenField("vlannamelen", None, "vlanname", "B"), + ShortField("vlanid", 1), + ShortField("mtu", 1500), + XIntField("dot10index", None), + StrLenField("vlanname", "default", length_from=lambda pkt:4 * ((pkt.vlannamelen + 3) / 4)), + ConditionalField(PacketListField("tlvlist", [], VTPVlanInfoTlv, + length_from=lambda pkt:pkt.len - 12 - (4 * ((pkt.vlannamelen + 3) / 4))), + lambda pkt:pkt.type not in [1, 2]) + ] + + def post_build(self, p, pay): + vlannamelen = 4 * ((len(self.vlanname) + 3) / 4) + + if self.len == None: + l = vlannamelen + 12 + p = chr(l & 0xff) + p[1:] + + # Pad vlan name with zeros if vlannamelen > len(vlanname) + l = vlannamelen - len(self.vlanname) + if l != 0: + p += "\x00" * l + + p += pay + + return p + + def guess_payload_class(self, p): + return conf.padding_layer + +_VTP_Types = { + 1 : 'Summary Advertisement', + 2 : 'Subset Advertisements', + 3 : 'Advertisement Request', + 4 : 'Join' + } + +class VTPTimeStampField(StrFixedLenField): + def __init__(self, name, default): + StrFixedLenField.__init__(self, name, default, 12) + + def i2repr(self, pkt, x): + return "%s-%s-%s %s:%s:%s" % (x[:2], x[2:4], x[4:6], x[6:8], x[8:10], x[10:12]) + +class VTP(Packet): + name = "VTP" + fields_desc = [ + ByteField("ver", 2), + ByteEnumField("code", 1, _VTP_Types), + ConditionalField(ByteField("followers", 1), + lambda pkt:pkt.code == 1), + ConditionalField(ByteField("seq", 1), + lambda pkt:pkt.code == 2), + ConditionalField(ByteField("reserved", 0), + lambda pkt:pkt.code == 3), + ByteField("domnamelen", None), + StrFixedLenField("domname", "manbearpig", 32), + ConditionalField(SignedIntField("rev", 0), + lambda pkt:pkt.code == 1 or + pkt.code == 2), + # updater identity + ConditionalField(IPField("uid", "192.168.0.1"), + lambda pkt:pkt.code == 1), + ConditionalField(VTPTimeStampField("timestamp", '930301000000'), + lambda pkt:pkt.code == 1), + ConditionalField(StrFixedLenField("md5", "\x00" * 16, 16), + lambda pkt:pkt.code == 1), + ConditionalField( + PacketListField("vlaninfo", [], VTPVlanInfo), + lambda pkt: pkt.code == 2), + ConditionalField(ShortField("startvalue", 0), + lambda pkt:pkt.code == 3) + ] + + def post_build(self, p, pay): + if self.domnamelen == None: + domnamelen = len(self.domname.strip("\x00")) + p = p[:3] + chr(domnamelen & 0xff) + p[4:] + + p += pay + + return p + +bind_layers(SNAP, VTP, code=0x2003) + +if __name__ == '__main__': + interact(mydict=globals(), mybanner="VTP") |