Method _write_packet

scapy/utils.py:2581–2648

Writes a single packet to the pcap file. :param packet: bytes for a single packet :type packet: bytes :param linktype: linktype value associated with the packet :type linktype: int :param sec: time the packet was captured, in seconds since epoch. If

(self,  # type: ignore
                      packet,  # type: bytes
                      linktype,  # type: int
                      sec=None,  # type: Optional[float]
                      usec=None,  # type: Optional[int]
                      caplen=None,  # type: Optional[int]
                      wirelen=None,  # type: Optional[int]
                      ifname=None,  # type: Optional[bytes]
                      direction=None,  # type: Optional[int]
                      comments=None,  # type: Optional[List[bytes]]
                      )

                                      options=opts))

    def _write_packet(self,  # type: ignore
                      packet,  # type: bytes
                      linktype,  # type: int
                      sec=None,  # type: Optional[float]
                      usec=None,  # type: Optional[int]
                      caplen=None,  # type: Optional[int]
                      wirelen=None,  # type: Optional[int]
                      ifname=None,  # type: Optional[bytes]
                      direction=None,  # type: Optional[int]
                      comments=None,  # type: Optional[List[bytes]]
                      ):
        # type: (...) -> None
        """
        Writes a single packet to the pcap file.

        :param packet: bytes for a single packet
        :type packet: bytes
        :param linktype: linktype value associated with the packet
        :type linktype: int
        :param sec: time the packet was captured, in seconds since epoch. If
                    not supplied, defaults to now.
        :type sec: float
        :param caplen: The length of the packet in the capture file. If not
                       specified, uses ``len(packet)``.
        :type caplen: int
        :param wirelen: The length of the packet on the wire. If not
                        specified, uses ``caplen``.
        :type wirelen: int
        :param comment: UTF-8 string containing human-readable comment text
                        that is associated to the current block. Line separators
                        SHOULD be a carriage-return + linefeed ('\r\n') or
                        just linefeed ('\n'); either form may appear and
                        be considered a line separator. The string is not
                        zero-terminated.
        :type bytes
        :param ifname: UTF-8 string containing the
                       name of the device used to capture data.
                       The string is not zero-terminated.
        :type bytes
        :param direction:  0 = information not available,
                           1 = inbound,
                           2 = outbound
        :type int
        :return: None
        :rtype: None
        """
        if caplen is None:
            caplen = len(packet)
        if wirelen is None:
            wirelen = caplen

        ifid = self.interfaces2id.get(ifname, None)
        if ifid is None:
            ifid = max(self.interfaces2id.values()) + 1
            self.interfaces2id[ifname] = ifid
            self._write_block_idb(linktype=linktype, ifname=ifname)

        # EPB flags (32 bits).