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Questions tagged [jnetpcap]

jNetPcap is an open-source Java wrapper for nearly all libpcap library native calls.

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129 questions
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Java Pcap loop not starting

I using jnetpcap library for listening to network traffic, and basically using the PcapPacketHandlers for listening to packets, after initializing them I start a pcap.loop() method so it will start listening. However about 50% of the time when I run…
TeemoPerson534
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JnetPcap pcap.loop issues

I'm using JNetPcap to capture packets from a pcap file in Java. The code works fine sometimes, but other times it doesn't capture any packets even though the pcap file is full of packets. Here's my code: import org.jnetpcap.Pcap; import…
elnino17
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same JNetPcap code to capture packets works inconsistently

I have this simple Java code that uses Jnetpcap to capture packets and print them. public class App { public static void main(String[] args) throws Exception { ArrayList alldevs = new ArrayList(); // Will be filled with…
Boring Boring
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error: is not abstract and does not override abstract method nextPacket(JPacket,Object) in JPacketHandler

During running this java code of calculating packets from pcaps file. : // Counting the number of packets in pcap files. // User defined package //package jnt; import java.io.File; import org.jnetpcap.Pcap; import…
Karan Kumar
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JnetPcap java.lang.NullPointerException

So I am taking part in a CTF and we are required to send a command to a server to make it reboot itself, the twist is the target only accepts requests from a specific ip addr so we are meant to be "spoofing" our addr to make this work, now as I am…
Aasil
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How to read rtp stream in a particular port using jnetpcap

I am trying to capture all rtp packets received in a particular port. I already know through which excat port I am receiving the packets (for generating rtp packets I am using vlc stream option). I want to use jnetpcap for easy processing. Or is…
Chandan Balaji
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Null Pointer Exception in udp headers line: "Udp udp = packet.getHeader(new Udp());" Why JNETPCAP can't initialize the Udp object

I am trying to create a raw socket using jnetpcap jar files to do IP spoofing in java using UDP protocol. When I tried the below code, I got a null pointer exception in object creation for the udp header. I decompiled the class files in the jar…
kabilan pachaiappan
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How to Block Windows OS automatic RST packet right after TCP handshake

Here's my Code: import com.github.ffalcinelli.jdivert.WinDivert; import com.github.ffalcinelli.jdivert.exceptions.WinDivertException; public class blocker { public static void main(String[] args) throws WinDivertException { WinDivert w…
RiptimRip
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Convert G711 alaw or G711 ulaw byte array to audio file [.wav or .au ]

I'm developing an application for recording , so I'm trying to decode trafic rtp using library Jnetpcap . The codec provided have in general two types : G711 alaw or G711 ulaw . I convert the payload and save it as a wav file but i can't listen the…
tintin
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How to extract DNS data from packet using jnetpcap

I'm using jnetpcap to made an application for android, and I know how to extract most of the information that I need, but I can't get the DNS packets. I know to extract DNS packet first need to look at UDP port 53, but when I reach that point I…
lcpr_phoenix
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Sniffing network traffic in java

Referring to: How could I sniff network traffic in Java? I managed to get the sniffer to work with various APIs mentioned there (jNetPcap seems to work best for me). However I struggle to make the payload actually readable, as it is in gzip…
No. 7892142
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JNetPcap Capture Packages No IPs returned

I have this code from here https://javatutorial.net/capture-network-packages-java But it does not return the src or destination ips. I can see the ip via System.out.println("packet.getHeader(ip)"); …
Sein3i8
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jnetpcap ICMP JBuffer Exception

hey i am trying to capture all ICMP Traffic and i stack with this exception: Opening file for reading: tmp-capture-file.pcap Src: 192.168.1.15 Dst: 192.168.1.22 Exception in thread "main" java.lang.NullPointerException at…
Daniel Mamary
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jnetpcap dependency for multiple OSes

I'm trying to write a program that uses jnetpcap and fits both linux and windows. I compile my program using Maven. Currently the dependency to jnetpcap is: …
t0m9er
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JnetPcap: reading from offline file very slow

I'm building a sort of custom version of wireshark with jnetpcap v1.4r1425. I just want to open offline pcap files and display them in my tableview, which works great except for the speed. The files I open are around 100mb with 700k packages. public…
banzai
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