优化抓包性能

vendor/github.com/google/gopacket/pcapgo/doc.go

@@ -0,0 +1,63 @@
+// Copyright 2018 The GoPacket Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+/*
+Package pcapgo provides some native PCAP support, not requiring C libpcap to be installed.
+
+Overview
+
+This package contains implementations for native PCAP support. Currently supported are
+
+ * pcap-files read/write: Reader, Writer
+ * pcapng-files read/write: NgReader, NgWriter
+ * raw socket capture (linux only): EthernetHandle
+
+Basic Usage pcapng
+
+Pcapng files can be read and written. Reading supports both big and little endian files, packet blocks,
+simple packet blocks, enhanced packets blocks, interface blocks, and interface statistics blocks. All
+the options also by Wireshark are supported. The default reader options match libpcap behaviour. Have
+a look at NgReaderOptions for more advanced usage. Both ReadPacketData and ZeroCopyReadPacketData is
+supported (which means PacketDataSource and ZeroCopyPacketDataSource is supported).
+
+		f, err := os.Open("somefile.pcapng")
+		if err != nil {
+			...
+		}
+		defer f.Close()
+
+		r, err := NewNgReader(f, DefaultNgReaderOptions)
+		if err != nil {
+			...
+		}
+
+		data, ci, err := r.ReadPacketData()
+		...
+
+Write supports only little endian, enhanced packets blocks, interface blocks, and interface statistics
+blocks. The same options as with writing are supported. Interface timestamp resolution is fixed to
+10^-9s to match time.Time. Any other values are ignored. Upon creating a writer, a section, and an
+interface block is automatically written. Additional interfaces can be added at any time. Since
+the writer uses a bufio.Writer internally, Flush must be called before closing the file! Have a look
+at NewNgWriterInterface for more advanced usage.
+
+		f, err := os.Create("somefile.pcapng")
+		if err != nil {
+			...
+		}
+		defer f.Close()
+
+		r, err = NewNgWriter(f, layers.LinkTypeEthernet)
+		if err != nil {
+			...
+		}
+		defer r.Flush()
+
+		err = r.WritePacket(ci, data)
+		...
+
+*/
+package pcapgo