Re: [libdnet-devel] Opening a tunnel

[Jesse P. <jes...@gm...>]

Ok, so I'm having issues getting a tunnel handle. Probably the same
issue when trying to get the firewall handle. Any case this is the
test code I'm using. The comments are the lines I would use for
sending the information.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <dnet.h>


int main(int argc, char** argv) {

   struct addr *remotehost = malloc(sizeof(struct addr));
   struct addr *localhost = malloc(sizeof(struct addr));

   addr_aton(argv[1], remotehost);
   addr_aton(argv[2], localhost);

   tun_t *tunnel = tun_open(localhost, remotehost, 20);

   if(tunnel == NULL) {
      fprintf(stderr, "Could not get tunnel connection\n");
      exit(34);
   }

   int size = 6*sizeof(char);
   char *msg = malloc(size);
   //char *msg = "hello";

   ssize_t sentBytes = tun_recv(tunnel, msg, size);
   //ssize_t sentBytes = tun_send(tunnel, msg, size);

   printf("%s\n");

   tun_close(tunnel);

   return 0;
}


On Mon, Jun 1, 2009 at 11:54 PM, Heiko Westermann <he...@or...> wrote:
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> Hi Jesse,
>
>> I'd like to try creating a simple tunnel with the library, or at least
>> know how I would.
>>
>> The general idea seems simple enough: Open the tunnel on both ends,
>> send, receive.
>>
>> tun_open is an issue because it takes an mtu int, and I can't find
>> documentation on what this is.
> the MTU is the max size of a packet.
> http://en.wikipedia.org/wiki/Maximum_transmission_unit
>>
>> I assume that a tunnel is connected by opening the interface with each
>> other's IP.
>>
>> When you are sending/receiving is a "packet" defined to be the size of
>> what you request?
>> FYI, I am trying to put this information to good use.
>> http://csfacwiki.cslabs.ewu.edu/wiki/securitylab/index.php/Libdnet
> No clue. Never used the tunnel feature. But you could look into the
> sourcecode. In most cases this solves your questions.
>
> regards,
> Heiko
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