Method send

scapy/layers/smbclient.py:197–239

(self, pkt)

        return self.sock.session

    def send(self, pkt):
        # Calculate what CreditCharge to send.
        if self.session.Dialect > 0x0202 and isinstance(pkt.payload, SMB2_Header):
            # [MS-SMB2] sect 3.2.4.1.5
            typ = type(pkt.payload.payload)
            if typ is SMB2_Negotiate_Protocol_Request:
                # See [MS-SMB2] 3.2.4.1.2 note
                pkt.CreditCharge = 0
            elif typ in [
                SMB2_Read_Request,
                SMB2_Write_Request,
                SMB2_IOCTL_Request,
                SMB2_Query_Directory_Request,
                SMB2_Change_Notify_Request,
                SMB2_Query_Info_Request,
            ]:
                # [MS-SMB2] 3.1.5.2
                # "For READ, WRITE, IOCTL, and QUERY_DIRECTORY requests"
                # "CHANGE_NOTIFY, QUERY_INFO, or SET_INFO"
                if typ == SMB2_Read_Request:
                    Length = pkt.payload.Length
                elif typ == SMB2_Write_Request:
                    Length = len(pkt.payload.Data)
                elif typ == SMB2_IOCTL_Request:
                    # [MS-SMB2] 3.3.5.15
                    Length = max(len(pkt.payload.Input), pkt.payload.MaxOutputResponse)
                elif typ in [
                    SMB2_Query_Directory_Request,
                    SMB2_Change_Notify_Request,
                    SMB2_Query_Info_Request,
                ]:
                    Length = pkt.payload.OutputBufferLength
                else:
                    raise RuntimeError("impossible case")
                pkt.CreditCharge = 1 + (Length - 1) // 65536
            else:
                # "For all other requests, the client MUST set CreditCharge to 1"
                pkt.CreditCharge = 1
            # [MS-SMB2] 3.2.4.1.2
            pkt.CreditRequest = pkt.CreditCharge + 1  # this code is a bit lazy
        # Get first available message ID: [MS-SMB2] 3.2.4.1.3 and 3.2.4.1.5
        pkt.MID = self.SequenceWindow[0]
        return super(SMB_Client, self).send(pkt)

    @ATMT.state(initial=1)
    def BEGIN(self):