Gcc Serial Port Communication Sniffer
65 thoughts on “ Packet Sniffer Code in C using Linux Sockets (BSD) – Part 2”. noviceHiI am struggling to use source code (part 2). Unfortunately I don’t have experience how to use source code, so what I did was copied the code into a file usingvi capture-then saved the file and issuedchmod u+x capture- #./capture./capture-code: line 21: syntax error near unexpected token `(‘./capture-code: line 21: `void ProcessPacket(unsigned char., int);’Please advise how to get this working. More over can I save the captured data in a format to be opened with Wireshark?Thanks. PablognuHello, i’m trying to adapt your code to analyze an IP packet captured with a breakout on a serial port.
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Silver Moon Post authorstruct iphdr.iph = (struct iphdr.)( Buffer + sizeof(struct ethhdr) );— the above line gets the pointer to the ip header in the structure ‘iphdr’ which can be used to access individual fields of the headeriphdrlen = iph-ihl.4— the above computes the length of the ip header using the ‘ihl’ field of the ip header. The ihl field contains the ip header length in total bytes/4.struct tcphdr.tcph=(struct tcphdr.)(Buffer + iphdrlen + sizeof(struct ethhdr));— the above line gets the pointer to the tcp header in the structure ‘tcphdr’ which can be used to access the individual fields of the tcp header.Its all pointers and structures.
Tedre191Very nice!But is it normal that I can’t reveive ARP broadcast packet when the ARP request is for my PC?Ex:Linux Server: 192.168.0.100MyLaptop: 192.168.0.150When I’m doing an ARP request to 192.168.0. With arping on my server, I reveive the packet on my laptop with your exemple but when I’m doing an arping 192.168.0.150, your exemple don’t catch it. Why?Both exemple send an arp packet to broadcast so why i’m not getting it when the request is for the computer running the code?When i’m using Wireshark, i’m seeing the arp request and the arp response packet.Thanks. sebazThanks for this really useful article! Nicely explained but I have still one question regarding the binding to an interface. I want only to sniff the packets from my fixed network interface, but not from my WLAN interface.
So I uncommented the setsockopt line and changed the name of the interface to eth0. But still I see packets from both network interfaces (I used wireshark to compare the results).I also tried the following code, but it seems not to work too.struct ifreq Interface;memset(&Interface, 0, sizeof(Interface));strncpy(Interface.ifrifrn.ifrnname, “eth1”, IFNAMSIZ);setsockopt(sockraw, SOLSOCKET, SOBINDTODEVICE, &Interface,sizeof(Interface))Any ideas what I’m doing wrong?
Serial Port Sniffer Open Source
Usb Serial Port Monitor
Interceptty seems to forward traffic just fine (running it to forward RealDev FakeDev1 FakeDev2 rogram you can catch communication FakeDev1 - RealDev) however the device does not seem to send anything back. My best guess is that it is because it can't forward ioctls (RS232 signals). Ttyrpld seemed to have potential since it comes with a kernel module but I failed to set it up and looking at the linux driver code it probably doesn't forward ioctls anyway:(.–Jan 15 '15 at 11:23.