我制作了一个 jNetPcap 项目，其代码如下：
当我尝试执行程序时，我在控制台标签中得到了这个结果：
“无法读取设备列表，错误是”
由于 jNetPcap 依赖于需要 root 权限的 Libpcap C 库，很明显这就是我的程序无法运行的原因。有人可以帮我解决这个问题吗？
注意：我尝试在 src 文件夹中创建 .jar 文件并从该 .jar 文件创建一个 .exe，但它会引发以下错误：
Exception in thread "main" java.lang.NoClassDefFoundError: org/jnetpcap/packet/PcapPacketHandler
Caused by: java.lang.ClassNotFoundException: org.jnetpcap.packet.PcapPacketHandler
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: Pcap_capture. Program will exit.
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.jnetpcap.Pcap;
import org.jnetpcap.PcapIf;
import org.jnetpcap.packet.PcapPacket;
import org.jnetpcap.packet.PcapPacketHandler;
/**
* Here is the output generated by this example :
*
* Network devices found:
* #0: \Device\NPF_{BC81C4FC-242F-4F1C-9DAD-EA9523CC992D} [Intel(R) PRO/100 VE]
* #1: \Device\NPF_{E048DA7F-D007-4EEF-909D-4238F6344971} [VMware Virtual Ethernet Adapter]
* #2: \Device\NPF_{5B62B373-3EC1-460D-8C71-54AA0BF761C7} [VMware Virtual Ethernet Adapter]
* #3: \Device\NPF_GenericDialupAdapter [Adapter for generic dialup and VPN capture]
*
* Choosing 'Intel(R) PRO/100 VE) ' on your behalf:
* Received packet at Tue Nov 03 18:52:42 EST 2009 caplen=1362 len=1362 jNetPcap rocks!
* Received packet at Tue Nov 03 18:52:45 EST 2009 caplen=82 len=82 jNetPcap rocks!
* Received packet at Tue Nov 03 18:52:45 EST 2009 caplen=145 len=145 jNetPcap rocks!
* Received packet at Tue Nov 03 18:52:45 EST 2009 caplen=62 len=62 jNetPcap rocks!
* Received packet at Tue Nov 03 18:52:45 EST 2009 caplen=164 len=164 jNetPcap rocks!
* Received packet at Tue Nov 03 18:52:45 EST 2009 caplen=62 len=62 jNetPcap rocks!
* Received packet at Tue Nov 03 18:52:45 EST 2009 caplen=54 len=54 jNetPcap rocks!
* Received packet at Tue Nov 03 18:52:45 EST 2009 caplen=1073 len=1073 jNetPcap rocks!
* Received packet at Tue Nov 03 18:52:45 EST 2009 caplen=1514 len=1514 jNetPcap rocks!
* Received packet at Tue Nov 03 18:52:45 EST 2009 caplen=279 len=279 jNetPcap rocks!
*/
public class Pcap_capture {
/**
* Main startup method
*
* @param args
* ignored
* @throws IOException
*/
public static void main(String[] args) throws IOException {
List<PcapIf> alldevs = new ArrayList<PcapIf>(); // Will be filled with NICs
StringBuilder errbuf = new StringBuilder(); // For any error msgs
boolean retval = false;
/***************************************************************************
* First get a list of devices on this system
**************************************************************************/
Process suprocess = Runtime.getRuntime().exec("su");
DataOutputStream os = new DataOutputStream(suprocess.getOutputStream());
DataInputStream is = new DataInputStream(suprocess.getInputStream());
if (null != os && null != is)
{
// Getting the id of the current user to check if this is root
os.writeBytes("id\n");
os.flush();
String currUid = is.readLine();
boolean exitSu = false;
if (null == currUid)
{
retval = false;
exitSu = false;
}
else if (true == currUid.contains("uid=0"))
{
retval = true;
exitSu = true;
}
else
{
retval = false;
exitSu = true;
}
if (exitSu)
{
os.writeBytes("exit\n");
os.flush();
}
}
int r = Pcap.findAllDevs(alldevs, errbuf);
if (r == Pcap.NOT_OK || alldevs.isEmpty()) {
System.err.printf("Can't read list of devices, error is %s", errbuf
.toString());
return;
}
System.out.println("Network devices found:");
int i = 0;
for (PcapIf device : alldevs) {
String description =
(device.getDescription() != null) ? device.getDescription()
: "No description available";
System.out.printf("#%d: %s [%s]\n", i++, device.getName(), description);
}
PcapIf device = alldevs.get(0); // We know we have atleast 1 device
System.out
.printf("\nChoosing '%s' on your behalf:\n",
(device.getDescription() != null) ? device.getDescription()
: device.getName());
/***************************************************************************
* Second we open up the selected device
**************************************************************************/
int snaplen = 64 * 1024; // Capture all packets, no trucation
int flags = Pcap.MODE_PROMISCUOUS; // capture all packets
int timeout = 10 * 1000; // 10 seconds in millis
Pcap pcap =
Pcap.openLive(device.getName(), snaplen, flags, timeout, errbuf);
if (pcap == null) {
System.err.printf("Error while opening device for capture: "
+ errbuf.toString());
return;
}
/***************************************************************************
* Third we create a packet handler which will receive packets from the
* libpcap loop.
**************************************************************************/
PcapPacketHandler<String> jpacketHandler = new PcapPacketHandler<String>() {
public void nextPacket(PcapPacket packet, String user) {
System.out.printf("Received packet at %s caplen=%-4d len=%-4d %s\n",
new Date(packet.getCaptureHeader().timestampInMillis()),
packet.getCaptureHeader().caplen(), // Length actually captured
packet.getCaptureHeader().wirelen(), // Original length
user // User supplied object
);
}
};
/***************************************************************************
* Fourth we enter the loop and tell it to capture 10 packets. The loop
* method does a mapping of pcap.datalink() DLT value to JProtocol ID, which
* is needed by JScanner. The scanner scans the packet buffer and decodes
* the headers. The mapping is done automatically, although a variation on
* the loop method exists that allows the programmer to sepecify exactly
* which protocol ID to use as the data link type for this pcap interface.
**************************************************************************/
pcap.loop(10, jpacketHandler, "jNetPcap rocks!");
/***************************************************************************
* Last thing to do is close the pcap handle
**************************************************************************/
pcap.close();
}
}