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README.md

README.md

An Erlang network protocol library.

Originally part of epcap: http://github.com/msantos/epcap

EXPORTS

pkt:decapsulate(Data) -> Packet

Types   Data = binary()
        Packet = [ Headers, Payload ]
        Headers = Header
        Header = {ether, binary()} | {arp, binary()} | {null, binary()} |
            {linux_cooked, binary()} | {ipv4, binary()} |
            {ipv6, binary()} | {tcp, binary()} | {udp, binary()} |
            {sctp, binary()} | {icmp, binary()} | {unsupported, binary()}
        Payload = binary()

Attempts to decapsulate the packet into a list of tuples.

The following functions create the protocol headers, converting between records and binaries. See include/pkt.hrl for definition of the record types.

ether(Packet) -> {#ether{}, Payload} | binary() null(Packet) -> {#null{}, Payload} | binary() linux_cooked(Packet) -> {#linux_cooked{}, Payload} | binary() arp(Packet) -> {#arp{}, Payload} | binary() ipv4(Packet) -> {#ipv4{}, Payload} | binary() ipv6(Packet) -> {#ipv6{}, Payload} | binary() tcp(Packet) -> {#tcp{}, Payload} | binary() sctp(Packet) -> {#sctp{}, Payload} | binary() udp(Packet) -> {#udp{}, Payload} | binary() icmp(Packet) -> {#icmp{}, Payload} | binary()

Types   Packet = Header | binary()
        Header = #ether{} | #null{} | #linux_cooked{} | #arp{} |
            #ipv4{} | #ipv6{} | #tcp{} | #sctp{} | #upd{} | #icmp{}

makesum(Packet) -> integer()

Types   Packet = IPv4_header | [IPv4_header, Header, Payload]
        IPv4_header = #ipv4{}
        Header = #tcp{} | #udp{}
        Payload = binary()

Calculate the checksum of the packet. 

TODO

  • DLTs
    • DLT_SLIP
    • DLT_PPP
    • DLT_RAW
    • DLT_PPP_SERIAL
    • DLT_PPP_ETHER
    • DLT_IEEE802_11
    • DLT_LOOP

CONTRIBUTORS

  • Olivier Girondel:

    • preliminary IPv6 support
  • Harald Welte:

    • support reading packets from pcap file
    • SCTP support
    • datalink types
  • Gregory Haskins:

    • application file fix
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