oops my bad..I think I was trying something that is not possible. (to
get the allocated size of a pointer).
Actually data was copied to the pointer as I wanted ..sweet!
thanks,
Bikrant
On Fri, Nov 7, 2008 at 3:24 PM, OpenSource Dev <dev.opensource@xxxxxxxxx> wrote:
> I am trying to copy IP packet to user-land application using QUEUE
> target in netfilter.
>
> So far I am able to read packet headers but I am not sure if I am
> getting the payload.
>
> nfq_get_payload() returns correct size of the packet but I don't find
> anything in data. I used both strlen and sizeof to check the size of
> data but it always returns 1 or is there better way to check.
>
> I am running Ubuntu 8.10 server on x86.
>
> Here is what I have done so far:
>
> main():
> nfq_bind_pf(h, AF_INET);
> qh = nfq_create_queue(h, 0, &cb, NULL);
> nh = nfq_nfnlh(h);
> fd = nfnl_fd(nh);
> nfq_set_mode(qh, NFQNL_COPY_PACKET, 0xffff)
>
>
> static int cb(struct nfq_q_handle *qh, struct nfgenmsg *nfmsg,
> struct nfq_data *nfa, void *data)
> {
> char *payloadData;
> int ret;
>
> ret = nfq_get_payload(nfa, &payloadData);
> printf("Len %d of data is: %d \n", ret, strlen(payloadData));
>
> u_int32_t id = print_pkt(nfa);
>
> return nfq_set_verdict(qh, id, NF_ACCEPT, 0, NULL);
> }
>
> Can anyone please point me what I am missing here ?
>
> Thanks,
> Bikrant
>
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