how to execute my libipq test program?

how to execute my libipq test program?

[hero lp]

hello, everybody. Wish you a good day!
I have compiled my test program with libipq. But when I try to execute
it with netqueue command, I get some troubles. ----There exists no
such command. Why? Then how to execute my program?
Another question: I think it's something like writer and reader
problem since kernel tries to put packets into user space and my
program tries to read them. Is it necessary for user application to do
some work for synchronization? If not, why?

Thanks for your suggestions!

RE: how to execute my libipq test program?

[Michael D. Berger]

My apology for first sending this privately, rather than to the
list.

I have copied below some information that I have send to several
lists and newsgroups regarding my attempt to get libipq to work.
As yet, I have gotten no replies to this regarding libipq, and it
is still not working.  Maybe there may be something in it that is
useful you.  If you get it working, I certainly would like to hear
about it, and I will do likewise.
Mike.

--
Michael D. Berger
m.d.berger@ieee.org 
--

Using RH-E-WS-4 that has kernel-2.6.9-5.EL, all freshly installed,
I downloaded and installed iptables-1.3.1 using the install script
shown below.

I wrote the simple test program shown below, following
man libipq.

When I run it, and then send pings from another
box, the program prints "started", and nothing
else, indicating that the ipq_read never returns.
The pings get no response.  I note that if I
change QUEUE to ACCEPT in the iptables -A, the
pings respond appropriately.

Advice would be much appreciated.

Mike.

--
Michael D. Berger
m.d.berger@ieee.org
--

*** install script ***

make KERNEL_DIR=/usr/src BINDIR=/usr/bin LIBDIR=/usr/lib \
   MANDIR=/usr/share/man
make install KERNEL_DIR=/usr/src BINDIR=/usr/bin \
   LIBDIR=/usr/lib MANDIR=/usr/share/man install
make install KERNEL_DIR=/usr/src BINDIR=/usr/bin LIBDIR=/usr/lib \
   MANDIR=/usr/share/man install-devel

*** start sequence ***

modprobe iptable_filter
modprobe ip_queue
iptables -A OUTPUT -p icmp -j QUEUE
netqueue # the name of my program

*** iptables-save output ***

# Generated by iptables-save v1.2.11 on Sat May  7 14:03:44 2005 *filter
:INPUT ACCEPT [30:6804] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [46:5164]
-A OUTPUT -p icmp -j QUEUE
COMMIT
# Completed on Sat May  7 14:03:44 2005

*** code ***

// netqueue.c 05/10/05

#include <linux/netfilter.h>
#include <libipq.h>
#include <stdio.h>

#define BUFSIZE 2048

static void die (struct ipq_handle *hand)
{
   ipq_perror("passer");
   ipq_destroy_handle(hand);
   exit(1);
}

int main(int argc, char* argv[])
{
   int                     status;
   unsigned char           buf[BUFSIZE];
   struct ipq_handle*      ipqHand;

   ipqHand = ipq_create_handle(0,PF_INET);

   if (ipqHand == 0)
      die(ipqHand);

   int cnt = 0;
   while (cnt++ < 3)
   {
      fprintf(stderr,"started\n");
      status = ipq_read(ipqHand,buf,BUFSIZE,0);
      fprintf(stderr,"read\n");

      if (status < 0)
         die(ipqHand);

      switch(ipq_message_type(buf))
      {
         case NLMSG_ERROR:
            fprintf(stderr,"Error msg: %s\n",ipq_get_msgerr(buf));
         break;

         default:
         {
            ipq_packet_msg_t*    msg = ipq_get_packet(buf);
            fprintf (stderr,"Type = %d\n",ipq_message_type(buf));
            status = ipq_set_verdict(ipqHand,msg->packet_id,
                        NF_ACCEPT,0,NULL);
            if (status < 0)
               die(ipqHand);
         }
      };
   }

   ipq_destroy_handle(ipqHand);
   return 0;
}



> -----Original Message-----
> From: netfilter-bounces@lists.netfilter.org 
> [mailto:netfilter-bounces@lists.netfilter.org] On Behalf Of hero lp
> Sent: Thursday, May 19, 2005 8:10 PM
> To: netfilter@lists.netfilter.org
> Subject: how to execute my libipq test program?
> 
> 
> hello, everybody. Wish you a good day!
> I have compiled my test program with libipq. But when I try to execute
> it with netqueue command, I get some troubles. ----There exists no
> such command. Why? Then how to execute my program?
> Another question: I think it's something like writer and reader
> problem since kernel tries to put packets into user space and my
> program tries to read them. Is it necessary for user application to do
> some work for synchronization? If not, why?
> 
> Thanks for your suggestions!
> 
> 

--
Michael D. Berger
m.d.berger@ieee.org 

re: how to execute my libipq test program?

[Michael D. Berger]

What kind of macline is it?  If unix or linux, try:
ls -l myFile   and let us know what you see.
./myFile       there may be a path issue.
If windows, ask someone else.
Mike.

--
Michael D. Berger
m.d.berger@ieee.org 

-----Original Message-----
From: hero lp [mailto:herolp@gmail.com] 
Sent: Thursday, May 19, 2005 10:15 PM
To: Michael D. Berger
Subject: Re: how to execute my libipq test program?


OK, thanks to your reply.
I have followed your instructions step by step.
But I get trouble at the last step. That is, when I try to execute my
compiled program, there is an error ---- no such command. Why?