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Top Forums Programming Manipulate the Linux ARP Cache in C Post 302344035 by semash! on Friday 14th of August 2009 11:45:06 AM
Old 08-14-2009
Hey Corona688!,
Thank you for your reply,

Yes, i want to implement something like arptables, but i need to filter also ethernet frame fields, so i can't use arptables.

I was thinking that it would be necessary to code a kernel module, but, for what i see, arptables does it and it's a user space aplication, so, what i need is the way to do it, i'll try arptables source code.

Thank you.

---------- Post updated at 11:45 AM ---------- Previous update was at 11:35 AM ----------

Ohhh no,
here's what i thought...
Code:
  if (!*handle) {
                arptables_insmod("arp_tables", modprobe);
                *handle = arptc_init(*table);
                if (!*handle) {

arptables uses a kernel module to block the arp table and allow data to it... Does anybody has a way better to to this?
 

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SEND_ARP(8)						      System Manager's Manual						       SEND_ARP(8)

NAME
send_arp - Send out one ARP packet with source/target IP and Ethernet hardware addresses suuplied by the user. SYNOPSIS
send_arp sndr_ip_addr sndr_hw_addr targ_ip_addr targ_hw_addr [src_int [src_hw_addr [dest_hw_addr]]] DESCRIPTION
send_arp This program sends out one ARP packet with source/target IP and Ethernet hardware addresses suuplied by the user. It compiles and works on Linux and will probably work on any Unix that has SOCK_PACKET. The idea behind this program is a proof of a concept, nothing more. It comes as is, no warranty. However, you're allowed to use it under one condition: you must use your brain simultaneously. If this condition is not met, you shall forget about this program and go RTFM imme- diately. OPTIONS
sndr_ip_addr Sender IP address for ARP packet. sndr_hw_addr Sender Hardware address for ARP packet. targ_ip_addr Target IP address for ARP packet. targ_hw_addr Target Hardware address for ARP packet. src_int Source Interface for ARP packet. src_hw_addr Source layer2 Hardware address for ARP packet. dest_hw_addr Destination layer2 Hardware address for ARP packet. AUTHORS
send_arp - Yuri Volobuev <volobuev@t1.chem.umn.edu> man page - Horms <horms@verge.net.au> layer2 patch - Patrick Koppen <patrick@koppen.de> 30th October 2003 SEND_ARP(8)
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