Method recompile_bpf

dshell/core.py:229–259

Compile the BPF stored in the .bpf attribute

(self)

    # TODO: Perhaps make bpf a property which auto-triggers this when the property value is set.
    def recompile_bpf(self):
        """
        Compile the BPF stored in the .bpf attribute
        """
        # This function is normally only called by the decode.py script,
        # but can also be called by plugins that need to dynamically update
        # their filter.
        if not self.bpf:
            logger.debug("Cannot compile BPF: .bpf attribute not set for plugin {!r}.".format(self.name))
            self.compiled_bpf = None
            return

        # Add VLAN wrapper, if necessary
        if self.vlan_bpf:
            bpf = "({0}) or (vlan and {0})".format(self.bpf)
        else:
            bpf = self.bpf
        logger.debug("Compiling BPF as {!r}".format(bpf))

        # Compile BPF and handle any expected errors
        try:
            self.compiled_bpf = pcapy.compile(
                self.link_layer_type, 65536, bpf, True, 0xffffffff
            )
        except pcapy.PcapError as e:
            if str(e).startswith("no VLAN support for data link type"):
                logger.error("Cannot use VLAN filters for {!r} plugin. Recommend running with --no-vlan argument.".format(self.name))
            elif str(e) == "syntax error":
                raise ValueError("Fatal error when compiling BPF: {!r}".format(bpf))
            else:
                raise e

    def ipdefrag(self, packet: 'Packet') -> 'Packet':
        """