Class SMB2_Create_Context

scapy/layers/smb2.py:3000–3106

class SMB2_Create_Context(_NTLMPayloadPacket):
    name = "SMB2 CREATE CONTEXT"
    OFFSET = 16
    _NTLM_PAYLOAD_FIELD_NAME = "Buffer"
    fields_desc = [
        LEIntField("Next", None),
        XLEShortField("NameBufferOffset", None),
        LEShortField("NameLen", None),
        ShortField("Reserved", 0),
        XLEShortField("DataBufferOffset", None),
        LEIntField("DataLen", None),
        _NTLMPayloadField(
            "Buffer",
            OFFSET,
            [
                PadField(
                    StrLenField("Name", b"", length_from=lambda pkt: pkt.NameLen),
                    8,
                ),
                # Must be padded on 8-octet alignment
                PacketLenField(
                    "Data", None, conf.raw_layer, length_from=lambda pkt: pkt.DataLen
                ),
            ],
            force_order=["Name", "Data"],
        ),
        StrLenField(
            "pad",
            b"",
            length_from=lambda x: (
                (
                    x.Next
                    - max(
                        x.DataBufferOffset + x.DataLen, x.NameBufferOffset + x.NameLen
                    )
                )
                if x.Next
                else 0
            ),
        ),
    ]

    def post_dissect(self, s):
        if not self.DataLen:
            return s
        try:
            if isinstance(self.parent, SMB2_Create_Request):
                data_cls = {
                    b"DHnQ": SMB2_CREATE_DURABLE_HANDLE_REQUEST,
                    b"DHnC": SMB2_CREATE_DURABLE_HANDLE_RECONNECT,
                    b"AISi": SMB2_CREATE_ALLOCATION_SIZE,
                    b"MxAc": SMB2_CREATE_QUERY_MAXIMAL_ACCESS_REQUEST,
                    b"TWrp": SMB2_CREATE_TIMEWARP_TOKEN,
                    b"QFid": SMB2_CREATE_QUERY_ON_DISK_ID,
                    b"RqLs": SMB2_CREATE_REQUEST_LEASE,
                    b"DH2Q": SMB2_CREATE_DURABLE_HANDLE_REQUEST_V2,
                    b"DH2C": SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2,
                    # 3.1.1 only