[ECOS] gateway

["Eduardo Sabaj" <esabaj at gmail dot com>]

I need to change the gateway address of the "eth0" interface on
runtime, so I would like to know if what I'm doing is correct:

int
SetGateway (const char *interface, const char *address)
{
   int test_sock;
   struct ecos_rtentry route;

   test_sock = socket (PF_INET, SOCK_DGRAM, 0);

   if ( test_sock == -1 )
       return -1;

   struct sockaddr_in a;
   struct sockaddr_in *addrp = &a;

   memset (&route, 0, sizeof(route));
   addrp->sin_family = AF_INET;
   addrp->sin_port = 0;
   addrp->sin_len = sizeof(*addrp);
   inet_pton (AF_INET, address, (char *)&addrp->sin_addr.s_addr);
   memcpy (&route.rt_dst, addrp, sizeof(*addrp));
   memcpy (&route.rt_gateway, addrp, sizeof(*addrp));

   route.rt_dev = (char *)interface;
   route.rt_flags = RTF_UP|RTF_GATEWAY;

   if ( ioctl (test_sock, SIOCADDRT, &route) == -1 )
   {
       diag_printf ("Imposible fijar gateway");
       close (test_sock);
       return -1;
   }

   close (test_sock);

   return 0;
}

Two more doubts:

1) Which is the way to obtain the gateway address on runtime? I didn't
find the ioctl to do this..
2) Is it possible to work without a gateway ? Nowadays I'm programming
the gateway with the same ip address configured for eth0.

Thank you in advance ..
Eduardo

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