我如何在 Java 中嗅探网络流量？
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How could I sniff network traffic in Java?
提问by Java Is Cool
I was just looking around to find out how to make a program that would sniff my network traffic in Java, but I couldn't find anything. I wanted to know if there was any way to view the network traffic going by. I heard of an idea with a Socket, but I don't get how that would work. So anyways, just looking for an API or a way to write it myself.
我只是四处看看如何制作一个程序来嗅探我的 Java 网络流量，但我找不到任何东西。我想知道是否有任何方法可以查看经过的网络流量。我听说过一个Socket的想法，但我不明白它是如何工作的。所以无论如何，只是寻找一个API或一种自己编写的方法。
EDIT:I would gladly like an API, but I would also like clarification on the way to sniff traffic with a Socket.
编辑：我很乐意使用 API，但我也想澄清使用 Socket 嗅探流量的方式。
采纳答案by Byungjoon Lee
jpcap, jNetPcap-- those are pcap wrapper projects in Java.
jpcap, jNetPcap-- 这些是 Java 中的 pcap 包装项目。
Kraken-- similar project, well documented with lots of examples.
Kraken- 类似的项目，有大量示例记录。
simple example from the Kraken web site:
来自 Kraken 网站的简单示例：
public static void main(String[] args) throws Exception {
File f = new File("sample.pcap");
EthernetDecoder eth = new EthernetDecoder();
IpDecoder ip = new IpDecoder();
TcpDecoder tcp = new TcpDecoder(new TcpPortProtocolMapper());
UdpDecoder udp = new UdpDecoder(new UdpPortProtocolMapper());
eth.register(EthernetType.IPV4, ip);
ip.register(InternetProtocol.TCP, tcp);
ip.register(InternetProtocol.UDP, udp);
PcapInputStream is = new PcapFileInputStream(f);
while (true) {
// getPacket() will throws EOFException and you should call is.close()
PcapPacket packet = is.getPacket();
eth.decode(packet);
}
}
回答by Juned Ahsan
You need a packet sniffer api, maybe netutilsis what you need:
您需要一个数据包嗅探器 api，也许netutils就是您所需要的：
The 'netutils' package gives a low level java network library. It contains extensive infrastructure for sniffing, injecting, building and parsing Ethernet/IP/TCP/UDP/ICMP packets.
'netutils' 包提供了一个低级 java 网络库。它包含用于嗅探、注入、构建和解析以太网/IP/TCP/UDP/ICMP 数据包的广泛基础设施。
回答by kervin
Another Java libpcap wrapper is https://github.com/kaitoy/pcap4j
另一个 Java libpcap 包装器是https://github.com/kaitoy/pcap4j
Pcap4J is a Java library for capturing, crafting and sending packets. Pcap4J wraps a native packet capture library (libpcap or WinPcap) via JNA and provides you Java-Oriented APIs.
Pcap4J 是一个用于捕获、制作和发送数据包的 Java 库。Pcap4J 通过 JNA 封装了一个本地数据包捕获库（libpcap 或 WinPcap），并为您提供面向 Java 的 API。
回答by murtaza.webdev
Not telling any API or java related thing but if you really want to only sniff data for analysis purpose then give try: WireShark. Its an application used for network analyse.
不告诉任何 API 或 Java 相关的事情，但如果您真的只想嗅探数据以进行分析，请尝试：WireShark。它是用于网络分析的应用程序。
Its useful if someone is not aware of.
如果有人不知道，它很有用。
