53 lines
1.5 KiB
Go
53 lines
1.5 KiB
Go
/*
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Package netshovel provides utilities to assist in creating of application-layer protocol decoders.
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examples/simple/simple.go contains a full decoder which does nothing but dump every utterance.
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It can be used as a template for new work.
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*/
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package netshovel
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import (
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"flag"
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"github.com/google/gopacket"
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"github.com/google/gopacket/layers"
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"github.com/google/gopacket/pcap"
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"github.com/google/gopacket/tcpassembly"
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"log"
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)
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// Mainloop to handle dispatching of PCAP files from command line
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//
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// This parses the command line arguments,
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// and for each PCAP file specified on the command line,
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// invokes a TCP assembler that sends streams to whatever is returned from factory.
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func Shovel(factory tcpassembly.StreamFactory) {
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//verbose := flag.Bool("verbose", false, "Write lots of information out")
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flag.Parse()
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streamPool := tcpassembly.NewStreamPool(factory)
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assembler := tcpassembly.NewAssembler(streamPool)
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for _, fn := range flag.Args() {
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handle, err := pcap.OpenOffline(fn)
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if err != nil {
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log.Fatal(err)
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}
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packetSource := gopacket.NewPacketSource(handle, handle.LinkType())
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packets := packetSource.Packets()
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for packet := range packets {
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if packet == nil {
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break
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}
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if packet.NetworkLayer() == nil || packet.TransportLayer() == nil || packet.TransportLayer().LayerType() != layers.LayerTypeTCP {
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continue
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}
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tcp := packet.TransportLayer().(*layers.TCP)
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assembler.AssembleWithTimestamp(packet.NetworkLayer().NetworkFlow(), tcp, packet.Metadata().Timestamp)
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}
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}
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assembler.FlushAll()
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}
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