pcap | 易学教程

Parsing pcap taken from wireshark file using - Java

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问题 I am working on converting PCAP file taken from wireshark using JAVA without using native or ready libraries. i converted the bytes to string directly just for checking the meaningful parts of it. then i tried to convert it from hexadecimal to string. It was not meaningful. there is java library jNetPcap which is wrapping all the libpcap library native calls which is written in c. The following picture is captured the wireless network. so the pcap contains the same information: Source ip,

How I can grant permission for Pcap library in Windows 10 from C#?

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问题 I use SharpPcap library for realise GOOSE protocol listener (EtherType = 0x88B8). It works well, but only if I run Wireshark in parallel, otherwise my program does not catch GOOSE packets. SharpPcap examples also don't capture GOOSE packets while Wireshark is not running. But SharpPcap library captures my broadcast UDP packets. 回答1: I had to open my SharpPCap device in promiscuous mode: winPcap.Open(SharpPcap.WinPcap.OpenFlags.Promiscuous | SharpPcap.WinPcap.OpenFlags.NoCaptureLocal,

How to manipulate packet and write to pcap file using pcap4j

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问题 I want to get through a pcap file and go to each packet. Then get IP Address and manipulate it. In the end, I'm going to write it into a new pcap file. I use pcap4j version 1.6.4 and below is how I get the Source IP Address: String fname = "FileName"; String dumpFile = "newFileName"; PcapHandle h = Pcaps.openOffline(fname); PcapDumper dumper = h.dumpOpen(newFileName); Packet p = null; while ((p = h.getNextPacket()) != null) { IpV4Packet ip = p.get(IpV4Packet.class); Inet4Address srcAddr = ip

How do you Identify the interface of a packet while listening to network traffic on all devices?

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I am writing a python program that needs to listening to traffic on all networking devices and identify packets based on their incoming interface. To listen on all interfaces I started my capture without specify a device, but I am unable to denote the interface of a particular packet. How is this done? Matt Ball I assume that the MAC address is sufficient information for you. The first 6 octets of a packet is the destination MAC address, which is immediately followed by the 6 octets of source MAC address. Source 来源： https://stackoverflow.com/questions/5845719/how-do-you-identify-the-interface

pcap_open_dead to simulate full UDP packets capture

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问题 Following up on my question about pcap file creation, I now would like to simulate the saving of a full UDP packet, including the Ethernet, IP and UDP headers. Which DLT_XXX type should I use? I believe pcap_dump() skips the Ethernet header when using pcap_open_dead(DLT_RAW, 65535). 回答1: If you want to simulate a full UDP-over-IP-over-Ethernet packet, you want DLT_EN10MB (the "10MB" in the name is historical; DLT_EN10MB really means "all types of Ethernet"). ( DLT_RAW is for packets where the

how to read a pcap file in c++ to get the packet information?

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问题 I want to write a program in c++ to read a pcap file and get the information of packets , like len,sourc ip, flags and etc. now I found the code like below and I think it will help me to get the information, but I have some questions: at the first I want to know which library should I add to my program and after that what is pcap_next,and how can I get the handle from a pcap file? /* Grab a packet */ packet = pcap_next(handle, &header); if (packet == NULL) { /* End of file */ break; } printf

Writing an http sniffer (or any other application level sniffer) [closed]

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问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed last year . I am trying my hands understanding PCAP libraries. I am able to apply a filter and get the TCP payload at port 80. But what next ? How can I read the HTTP data - suppose I want to know the "User Agent" field value in the http header..how should I proceed ? I have searched the

pcap_set_rfmon does not work?

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问题 I am trying to set my device to monitor mode, and i know its capable of being in monitor mode doing a "iwconfig wlan0 mode monitor" works, i run my code and i can capture packets from anywhere. The problem is that in libpcap it fails to set my device to monitor mode at all(without entering the above-mentioned command line).I can't capture any packets until i manually connect to a access point. pcap_t *handler = pcap_create("wlan0",errbuff); if(pcap_set_rfmon(handler,1)==0 ) { std::cout <<

Weird pcap header of byte sequence 0a 0d 0d 0a created on Mac?

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I have a PCAP file that was created on a Mac with mergecap that can be parsed on a Mac with Apple's libpcap but cannot be parsed on a Linux system. combined file has an extra 16-byte header that contains 0a 0d 0d 0a 78 00 00 00 before the 4d 3c 2b 1a intro that's common in pcap files. Here is a hex dump: 0000000: 0a0d 0d0a 7800 0000 4d3c 2b1a 0100 0000 ....x...M<+..... 0000010: ffff ffff ffff ffff 0100 4700 4669 6c65 ..........G.File 0000020: 2063 7265 6174 6564 2062 7920 6d65 7267 created by merg 0000030: 696e 673a 200a 4669 6c65 313a 2037 2e70 ing: .File1: 7.p 0000040: 6361 7020 0a46 696c

Ruby 1.9.2 and pcap gem? Compiling error

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问题 I am having trouble installing the pcap gem with ruby 1.9.2... It works fine with 1.8.7. Anyone know whats going on? wuntee@wuntee:~$ rvm use system Now using system ruby. wuntee@wuntee:~$ ruby -v ruby 1.8.7 (2009-06-12 patchlevel 174) [universal-darwin10.0] wuntee@wuntee:~$ gem install pcap WARNING: Installing to ~/.gem since /Library/Ruby/Gems/1.8 and /usr/bin aren't both writable. WARNING: You don't have /Users/wuntee/.gem/ruby/1.8/bin in your PATH, gem executables will not run. Building