Re: Modify packets using netfilter

[Eric Leblond <eric@regit.org>]

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Le sam 13/12/2003 à 17:45, Jee J.Z. a écrit :
> Hi Antony and all,
> 
> Thanks for your reply. What I am trying to do is to get the whole packets including their payloads and store them into a self defined queue, and randomly modify some bits in each packet. 
> I am using iptables userspace programming. Does anybody have some good idea how to achieve this? Thank you.

with libipq you can modify the payload of the packet :

Take from man page :
int ipq_set_verdict(const struct ipq_handle *h, ipq_id_t  id,  unsigned
       int verdict, size_t data_len, unsigned char *buf);

if data_len is not 0 and buf is not NULL, the header and payload of the
packet get replaced by the datas pointed by buf.

BR,
-- 
Eric Leblond
Nufw, Now User Filtering Works (http://www.nufw.org)

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