RE: libnet_write_raw_ipv4() Message too long

Hello,

use a tag for your builder functions, this way your pblocks will be altered 
instead of creating each time a new pblock.
pseudo code:

ptag_data = 0;
ptag_tcp_or_udp_or_icmp= 0;
ptag_ip = 0;

for()
{
   ptag_data = libnet_build_data (...,...,..., ptag_data);

  ptag_tcp_or_udp_or_icmp = libnet_build_tcp_or_udp_or_icmp 
(..,...ptag_tcp_or_udp_or_icmp );

  ptag_ip = libnet_build_ip (...., ..., ptag_ip);

  libnet_wrilt();
}

like this the first time you enter the loop you will create a new pblock for 
each build_xxx() because the tags passed are 0, these fns will return you a 
tag, the next time you call the functions the tags will have a value. so 
libnet will search for the blocks with the corresponding tags and modify the 
contents of the block instaed of creating a new one.

You could also use libnet_clear_packet() after you send the packet each 
time, which will delete all the pblocks of the libnet context. if you use 
this method always pass a zero in the tag field of the build_xx fns. after 
you libnet_write() call libnet_clear_packet().

also check the samples, I think if you read through the codes you can easily 
do what you want.

Regards, Mustaffa Abu Sedira


>From: Ben L <[email protected]>
>To: [email protected]
>Subject: libnet_write_raw_ipv4() Message too long
>Date: 2 Sep 2004 13:28:10 -0000
>
>
>
>Hello,
>
>i have a problem with my libnet application. I have written a small 
>programm to test my firewall and a packetlogger. My code simply creates 
>some ip packets with valid ip addresses in a loop.
>Those packets are transmitted via tcp.
>
>Everything works fine for about 70 packets, then i get the (Message too 
>long) error msg.
>
>The problem is that my code always adds the data for the new packet to the 
>current libnet context. I need a way to get rid of the old data after i 
>have sended a packet in a loop.
>
>pseudo code:
>
>while (ip addresses)

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