A simple wrapper around libpcap for the Go programming language

Related tags

Network gopcap
Overview

PCAP

This is a simple wrapper around libpcap for Go. Originally written by Andreas Krennmair [email protected] and only minorly touched up by Mark Smith [email protected].

Please see the included pcaptest.go and tcpdump.go programs for instructions on how to use this library.

Miek Gieben [email protected] has created a more Go-like package and replaced functionality with standard functions from the standard library. The package has also been renamed to pcap.

Issues
  • Compilation Error

    Compilation Error

    Doing go get github.com/akrennmair/gopcap

    gives

    .gvm/pkgsets/go1.2.1/global/src/github.com/akrennmair/gopcap/pcap.go:12:18: fatal error: pcap.h: No such file or directory
     #include <pcap.h>
    
    opened by apsdehal 2
  • Make packet headers a specific interface.

    Make packet headers a specific interface.

    This is a slightly more involved change than the first few I've sent. It changes a packet's Headers from interface{} to a new Header interface. Currently, this interface just as a HeaderType() (enumerated in decode.go) and a Bytes() slice, which returns the bytes detected to be part of the header.

    This allows for a couple of nice things. First, it makes switching based on header type easy (switch pkt.HeaderType() {}). Also, it opens up the ability to do cursory parsing of certain header types without fully coding them. If, for example, there's a header X that doesn't affect the ending payload, we can decode and skip it without fully coding the decode() function. I'm planning to do this next with IPv6 extensions, basically a quick initial implementation that does nothing but pulls out Bytes() and HeaderType(), and leaves the rest of the decoding for a later time.

    opened by gconnell 1
  • fixing tcpdump's Usage errorout feedback on invalid cmdline args

    fixing tcpdump's Usage errorout feedback on invalid cmdline args

    If you improperly call the tcpdump tool, no error feedback is written to stdout. There is a missing flush call on the errout writer.

    You will now get the friendly feedback: usage: ./tcpdump [ -i interface ] [ -s snaplen ] [ -X ] [ expression ]

    opened by jcuga 0
  • pppoe decode packet

    pppoe decode packet

    hi can be add pppoe decode packet code? "code.google.com/p/gopacket/" see code is very difficult i can not understand because i need to thank you very much.

    opened by sun8911879 0
  • Fixed precision of timestmaps.

    Fixed precision of timestmaps.

    The C pcap library uses {sec,usec} for timestamps, where usec are microsconds. Go's time.Time have nanosecond precisions, so we need to convert between the two.

    opened by tsg 0
  • Speedcopy

    Speedcopy

    Speed up the copy of packet data from C into Go, using C.GoBytes. Also avoid a copy of the packet header struct. Together, this seems to reduce packet read speed by ~50%

    Added a benchmark binary for testing this change.

    Old: (/tmp/bench is tools/benchmark with the old code) [email protected]:/$ /tmp/bench -file /tmp/foo Took 3.334896s to process 1000000 packets, 3.334us per packet, 0 nil packets [email protected]:/$ /tmp/bench -file /tmp/foo Took 3.329675s to process 1000000 packets, 3.329us per packet, 0 nil packets

    New: (/tmp/bench2 is tools/benchmark with the new code) [email protected]:/$ /tmp/bench2 -file /tmp/foo Took 1.588695s to process 1000000 packets, 1.588us per packet, 0 nil packets [email protected]:/$ /tmp/bench2 -file /tmp/foo Took 1.580306s to process 1000000 packets, 1.58us per packet, 0 nil packets

    About a 50% reduction in the initial packet copy. This seemed to work pretty repeatably.

    opened by gconnell 0
  • VLAN tagging (802.1Q) support

    VLAN tagging (802.1Q) support

    I've added some decoding for VLAN-tagged IPs. Note there's a couple of extraneous changes to io.go and pcap.go... these were done by 'go fmt', not by me.

    opened by gconnell 0
  • Cleanups

    Cleanups

    Hello,

    These commits remove a lot of code from gopcap and use the standard library a lot more. Esp the use of the encoding/binary instead of all the put4/put2, asUint16, etc.

    I also seems to run somewhat faster. :)

    opened by miekg 0
  • Initial testing for decode library.

    Initial testing for decode library.

    This includes a simple test of packet.Decode, doing full testing against decoding a single IPv4 TCP packet. It also provides a second test specifically for a small TCP packet with ethernet padding, to make sure that change works correctly as well.

    opened by gconnell 0
  • Change decodeIp to only consider use up to byte Length bytes.

    Change decodeIp to only consider use up to byte Length bytes.

    This solves the issue where Ethernet packets must be a minimum of 60 bytes, but can take up only 54 bytes on the wire if there's no payload added. Without this change, packets of that type may appear to be TCP packets with 6 null bytes in their payload.

    See http://forums.devshed.com/networking-help-109/tcp-protocol-mysterious-6-null-byte-payload-303357.html for more discussion on this.

    opened by gconnell 0
  • Make gopcap goinstallable.

    Make gopcap goinstallable.

    The Makefile is ignored by goinstall. This small change allows users of the wrapper to use goinstall to easily install the wrapper. See http://golang.org/cmd/goinstall/ for more information.

    opened by DanielArndt 0
  • problem of cross compile gopacket in mips

    problem of cross compile gopacket in mips

    I got a problem of cross compiling program based on gopacket : the env of go is--------> GOARCH="mips" GOBIN="" GOEXE="" GOHOSTARCH="amd64" GOHOSTOS="linux" GOOS="linux" GOPATH="/root/go" GORACE="" GOROOT="/usr/local/go" GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64" GCCGO="gccgo" CC="mips-linux-gcc" GOGCCFLAGS="-fPIC -mabi=32 -march=mips32 -pthread -fmessage-length=0" CXX="mips-linux-g++" CGO_ENABLED="1" CGO_CFLAGS="-I/usr/include" CGO_CPPFLAGS="" CGO_CXXFLAGS="-g -O2" CGO_FFLAGS="-g -O2" CGO_LDFLAGS="-L/root/Desktop/libpcap-1.9.0" PKG_CONFIG="pkg-config"

    the result of it is:

    runtime/cgo

    cc1: warnings being treated as errors In file included from gcc_libinit.c:8: /usr/include/pthread.h:675: Warning:‘regparm’ attribute directive ignored /usr/include/pthread.h:687: Warning:‘regparm’ attribute directive ignored /usr/include/pthread.h:732: Warning:‘regparm’ attribute directive ignored

    I change the include path to "-I/root/Desktop/libpcap-1.9.0" ,the result is: loading DWARF type: decoding dwarf section info at offset 0x157: unexpected opcode

    I have no idea about that.Can u help me?: )

    opened by superironbird 0
  • Tests failure: identifier may conflict with identifiers generated by cgo

    Tests failure: identifier may conflict with identifiers generated by cgo

    With Go 1.12.5 on Fedora Rawhide x86_64, commit 00e11033259acb75598ba416495bb708d864a010:

    Testing    in: /builddir/build/BUILD/gopcap-00e11033259acb75598ba416495bb708d864a010/_build/src
             PATH: /builddir/build/BUILD/gopcap-00e11033259acb75598ba416495bb708d864a010/_build/bin:/builddir/.local/bin:/builddir/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/sbin
           GOPATH: /builddir/build/BUILD/gopcap-00e11033259acb75598ba416495bb708d864a010/_build:/usr/share/gocode
      GO111MODULE: off
          command: go test -buildmode pie -compiler gc -ldflags "-X github.com/akrennmair/gopcap/version=0 -X github.com/akrennmair/gopcap/version.commit=00e11033259acb75598ba416495bb708d864a010 -extldflags '-Wl,-z,relro -Wl,--as-needed  -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld '"
          testing: github.com/akrennmair/gopcap
    github.com/akrennmair/gopcap
    # github.com/akrennmair/gopcap
    ./pcap.go:129:13: identifier "_Ctype_struct_pcap_stat" may conflict with identifiers generated by cgo
    ./pcap.go:142:10: identifier "_Ctype_struct_bpf_program" may conflict with identifiers generated by cgo
    ./pcap.go:216:34: identifier "_Ctype_struct_pcap_addr" may conflict with identifiers generated by cgo
    ./pcap.go:219:56: identifier "_Ctype_struct_pcap_addr" may conflict with identifiers generated by cgo
    FAIL	github.com/akrennmair/gopcap [build failed]
    
    opened by eclipseo 0
  • Relationship with google/gopacket

    Relationship with google/gopacket

    I noticed https://github.com/google/gopacket, which says it was forked off this repo. Are there any advantages of using this repo versus https://github.com/google/gopacket?

    opened by tleyden 0
Owner
Andreas Krennmair
Andreas Krennmair
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