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package rawlink
A portable API to send and receive raw packets.
There are times when one needs to construct the full ethernet frame to send/receive. Most unixes support BPF (BSD Packet Filter) to achieve it, but linux provides the same functionality via AF_SOCKET. This API works with either a BPF or AF_SOCKET backend, so it should work on every usable UNIX, as well as linux out there.
val open_link : ?filter:string -> ?promisc:bool -> string -> topen_link ~filter ~promisc interface. Creates a rawlink on the specified interface, a BPF program filter can be passed to filter out incoming packets. If promisc is true, sets interface to promiscuous mode, defaults to false.
val close_link : t -> unitclose_link. Closes a rawlink.
val read_packet : t -> Cstruct.tread_packet t. Reads a full packet, may raise Unix.Unix_error.
val send_packet : t -> Cstruct.t -> unitsend_packet t. Sends a full packet, may raise Unix.Unix_error.
dhcp_server_filter. Returns a BPF program suitable to be passed in open_link ~filter, it accepts UDP packets destined to port 67 (DHCP server).