89 lines
3.9 KiB
Python
89 lines
3.9 KiB
Python
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# This file is part of Scapy
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# Scapy is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 2 of the License, or
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# any later version.
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#
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# Scapy is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Scapy. If not, see <http://www.gnu.org/licenses/>.
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# Copyright (C) 2009 Adline Stephane <adline.stephane@gmail.com>
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# Copyright 2018 Gabriel Potter <gabriel@potter.fr>
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# Partial support of RFC3971
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# scapy.contrib.description = Secure Neighbor Discovery (SEND) (ICMPv6)
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# scapy.contrib.status = loads
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from __future__ import absolute_import
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from scapy.packet import Packet
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from scapy.fields import BitField, ByteField, FieldLenField, PacketField, \
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PacketLenField, ShortField, StrFixedLenField, StrLenField, UTCTimeField
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from scapy.layers.x509 import X509_SubjectPublicKeyInfo
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from scapy.layers.inet6 import icmp6ndoptscls, _ICMPv6NDGuessPayload
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from scapy.compat import chb
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from scapy.volatile import RandBin
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class ICMPv6NDOptNonce(_ICMPv6NDGuessPayload, Packet):
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name = "ICMPv6NDOptNonce"
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fields_desc = [ByteField("type", 14),
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FieldLenField("len", None, length_of="nonce", fmt="B", adjust=lambda pkt, x: int(round((x + 2) / 8.))), # noqa: E501
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StrLenField("nonce", "", length_from=lambda pkt: pkt.len * 8 - 2)] # noqa: E501
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class ICMPv6NDOptTmstp(_ICMPv6NDGuessPayload, Packet):
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name = "ICMPv6NDOptTmstp"
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fields_desc = [ByteField("type", 13),
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ByteField("len", 2),
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BitField("reserved", 0, 48),
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UTCTimeField("timestamp", None)]
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class ICMPv6NDOptRsaSig(_ICMPv6NDGuessPayload, Packet):
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name = "ICMPv6NDOptRsaSig"
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fields_desc = [ByteField("type", 12),
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FieldLenField("len", None, length_of="signature_pad", fmt="B", adjust=lambda pkt, x: (x + 20) // 8), # noqa: E501
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ShortField("reserved", 0),
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StrFixedLenField("key_hash", "", length=16),
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StrLenField("signature_pad", "", length_from=lambda pkt: pkt.len * 8 - 20)] # noqa: E501
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class CGA_Params(Packet):
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name = "CGA Parameters data structure"
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fields_desc = [StrFixedLenField("modifier", RandBin(size=16), length=16),
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StrFixedLenField("subprefix", "", length=8),
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ByteField("cc", 0),
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PacketField("pubkey", X509_SubjectPublicKeyInfo(),
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X509_SubjectPublicKeyInfo)]
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class ICMPv6NDOptCGA(_ICMPv6NDGuessPayload, Packet):
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name = "ICMPv6NDOptCGA"
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fields_desc = [ByteField("type", 11),
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FieldLenField("len", None, length_of="CGA_PARAMS", fmt="B", adjust=lambda pkt, x: (x + pkt.padlength + 4) // 8), # noqa: E501
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FieldLenField("padlength", 0, length_of="padding", fmt="B"),
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ByteField("reserved", 0),
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PacketLenField("CGA_PARAMS", "", CGA_Params, length_from=lambda pkt: pkt.len * 8 - pkt.padlength - 4), # noqa: E501
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StrLenField("padding", "", length_from=lambda pkt: pkt.padlength)] # noqa: E501
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def post_build(self, p, pay):
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l_ = len(self.CGA_PARAMS)
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tmp_len = -(4 + l_) % 8 # Pad to 8 bytes
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p = p[:1] + chb((4 + l_ + tmp_len) // 8) + chb(tmp_len) + p[3:4 + l_]
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p += b"\x00" * tmp_len + pay
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return p
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send_icmp6ndoptscls = {11: ICMPv6NDOptCGA,
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12: ICMPv6NDOptRsaSig,
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13: ICMPv6NDOptTmstp,
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14: ICMPv6NDOptNonce
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}
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icmp6ndoptscls.update(send_icmp6ndoptscls)
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