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Installation

Jnetpcap not working from commandline but works in eclipse

Hi There
I was hoping someone might be able to point me in the right direction as to why im getting this error when running my application using java from the command line after compiling the java file with javac (which works with no errors). I have copied the dll (jnetpcap.dll) is in C:\Windows\System32 directory and set the ClassPath in windows:

C:\>echo %CLASSPATH%
C:\jnetpcap\jnetpcap.jar

The code works just fine when i run it in eclipse it capures IP addresses no problem. But when i try compiling the .java file from the command line using "javac PackageCapture" i dont get an error but i get 2 class files for some reason (see below):

C:\Users\Anthony.mcgoverna-lt\workspace_neon\packet_ver01\src\packet_sniffer>dir

Directory of C:\Users\Anthony.mcgoverna-lt\workspace_neon\packet_ver01\src\packet_sniffer

22-Feb-17 11:25 AM

.
22-Feb-17 11:25 AM ..
22-Feb-17 11:24 AM 6,456 PackageCapture.java
16-Feb-17 06:34 PM 1,566 sniff_ver1.java
2 File(Drunk 8,022 bytes
2 Dir(Drunk 336,621,965,312 bytes free

Then i compile the .java file (no errors)

C:\Users\Anthony.mcgoverna-lt\workspace_neon\packet_ver01\src\packet_sniffer>javac PackageCapture.java

Then i get 2 class files for some weird reason

C:\Users\Anthony.mcgoverna-lt\workspace_neon\packet_ver01\src\packet_sniffer>dir

Directory of C:\Users\Anthony.mcgoverna-lt\workspace_neon\packet_ver01\src\packet_sniffer

22-Feb-17 11:26 AM

.
22-Feb-17 11:26 AM ..
22-Feb-17 11:26 AM 2,027 PackageCapture$1.class
22-Feb-17 11:26 AM 2,517 PackageCapture.class
22-Feb-17 11:24 AM 6,456 PackageCapture.java
16-Feb-17 06:34 PM 1,566 sniff_ver1.java
4 File(Drunk 12,566 bytes
2 Dir(Drunk 336,621,957,120 bytes free

Solution to "glibc detected java: malloc(): memory corruption" Error

Hi, User aboyapati issued a crash bug last year (http://jnetpcap.com/node/1431). I experienced same issue on linux and I flew a day solving it. Without valgrind, it would have been impossible. I attached a patch file, but this site requires you to login to view the patch file.

Using jnetPcap on android studio or eclipse step by step

Hi dear friends ,I am a biginer at jnetPcap on android , I have a big chalange to use jnetPcat in android application.
First of all I have a question,Can I use jnetPcap for making a packet and send to over of network(2nd layer)?
If I can , How do I careate packet with jnetpcap on android? My IDE is android studio.
I downloaded jnetpcap-1.3.0-1.win64.zip on this site after extarcted this file , I add jnetpcap.jar to my android application after that I can call all the classes,but when I want run my app I faced to an error.
My sample code is :

public class PcapAndroidActivity extends Activity {

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
int size = 100;
Ethernet wEth;
byte[] sourceMac = {};
byte[] destMac = {};
Ip4 wIp4;
byte[] bytes = {};
byte[] dIP = {};
byte[] sIP = {};

try {
Process p = Runtime.getRuntime().exec("su");
JPacket wPacket = new JMemoryPacket(size);
wPacket.order(ByteOrder.BIG_ENDIAN);
wPacket.setUShort(12, 0x0800);
wPacket.scan(JProtocol.ETHERNET_ID);
wEth = wPacket.getHeader(new Ethernet());
wEth.source(sourceMac);
wEth.destination(destMac);
wEth.checksum(wEth.calculateChecksum());
int headersize = 14;
wPacket.setUByte(14, 0x40 | 0x05);
wPacket.scan(JProtocol.ETHERNET_ID);
wIp4 = wPacket.getHeader(new Ip4());
wIp4.length(500 - wEth.size());
wIp4.source(dIP);
wIp4.destination(sIP);
wIp4.ttl(32);
wIp4.flags(0);
wIp4.offset(0);
wIp4.checksum(wIp4.calculateChecksum());
headersize += 20;
}
catch (Exception ex)

Using jnetpcap in linux throwing "glibc detected java: malloc(): memory corruption" Error

Hi,

I'm currently using jnetpcap1.4 r1425 version in my project. I'm using offline capture on a pcap file and getting all the sip packets details from the capture file.
I've developed this project on Windows using Eclipse. The project was working fine and I've exported the application as jar and passed the pcap file as argument and i'm getting the desired output and writing it into an external text file.

But now i need to use this application on a linux platform. I've followed all the steps from the link : http://jnetpcap.com/?q=compile/redhat

And i could get the .so files in my usr/lib folder.

When i use the jar file of my application here on linux machine i could see the iteration only on the first few packets (around 2-5) of the capture file and then gets an error.

Even with the sample ClassicPcapExampleOfflineCapture example i get the same error

OUTPUT:

cb_pcap_packet_dispatch() - ENTER
cb_pcap_packet_dispatch() - Java_org_jnetpcap_packet_JScanner_scan
cb_pcap_packet_dispatch() - transferToNewBuffer
cb_pcap_packet_dispatch() - CallVoidMethod
cb_pcap_packet_dispatch() - obj=0x7f6ab455beb8, mid=0x7f6ab036a010, pcap_packet=0x7f6ab009cc30, user=0x7f6ab455beb0
cb_pcap_packet_dispatch() - DeleteLocalRef
cb_pcap_packet_dispatch() - ExceptionCheck
cb_pcap_packet_dispatch() - ENTER
cb_pcap_packet_dispatch() - Java_org_jnetpcap_packet_JScanner_scan
cb_pcap_packet_dispatch() - transferToNewBuffer
cb_pcap_packet_dispatch() - CallVoidMethod
cb_pcap_packet_dispatch() - obj=0x7f6ab455beb8, mid=0x7f6ab036a010, pcap_packet=0x7f6ab009cc48, user=0x7f6ab455beb0
cb_pcap_packet_dispatch() - DeleteLocalRef
cb_pcap_packet_dispatch() - ExceptionCheck
cb_pcap_packet_dispatch() - ENTER
cb_pcap_packet_dispatch() - Java_org_jnetpcap_packet_JScanner_scan
*** glibc detected *** java: malloc(): memory corruption: 0x00007f6ab0c10eb0 ***
======= Backtrace: =========
/lib64/libc.so.6[0x3ab5075f4e]
/lib64/libc.so.6[0x3ab507a41a]

Exception in thread "main" java.lang.UnsatisfiedLinkError: no jnetpcap in java.library.path

Trying to read the pcap file and dump the GPS location related information into a text file
I'm using Eclipse (Eclipse Java EE IDE for Web Developers. Version: Mars.1 Release (4.5.1) Build id: 20150924-1200 )
on windows 7 (SP1) 64 bit Operating system

Downloaded jnetpcap.jar file for 1.3 version for for both 32 and 64 and tried the following code
installed the jar file from Eclipse->project->properties->java buidd path-> Libraries and added the jar file (as explained in one of the options on this site)

public static void main(String[] args) {
final String FILENAME = "c://some.pcap";

final StringBuilder errbuf = new StringBuilder();

final Pcap pcap = Pcap.openOffline(FILENAME, errbuf);
}

in both cases, I'm getting the followimg error
Exception in thread "main" java.lang.UnsatisfiedLinkError: no jnetpcap in java.library.path
at java.lang.ClassLoader.loadLibrary(Unknown Source)
at java.lang.Runtime.loadLibrary0(Unknown Source)
at java.lang.System.loadLibrary(Unknown Source)
at org.jnetpcap.Pcap.(Unknown Source)
at PCAPTestParser.main(PCAPTestParser.java:20)

What am I doing wrong?

Please help