www.pudn.com > vxworks_networking.rar > etherOutputDemo.c

/* etherOutputDemo.c - Demo for using low-level output ethernet routines */
 
 /* Copyright 1984-1997 Wind River Systems, Inc. */
 
 /*
 modification history
 --------------------
 01d,06nov97,mm   added copyright.
 01c,22Sep97,mm   added include string.h and "etherLib.h"
 01b,22Sep97,mm   changed "if.h" to "netinet/if_ether.h"  
 01a,16Feb94,ms   modified and cleaned up for VxDemo.
 */
 
 #include "net/if.h"
 #include "netinet/if_ether.h"
 #include "etherDemo.h" 
 #include  
 #include   
 #include "etherLib.h"  
 
 
 /*****************************************************************************
  * etherOutputDemo - Demo for using low-level ethernet output routines
  *
  * DESCRIPTION
  *
  *     Sends (broadcast) data on an ethernet network interface 
  *     and handles (receives) raw input frames (input data) from the network
  *     interface using ether input hook routine etHandle.
  *
  *     This is a simple demonstration of using low-level output ethernet 
  *     routines. The other half of the demonstration of using low-level
  *     input ethernet routines is in etherInputDemo.c. etherInputDemo task  
  *     runs on one VxWorks system, and etherOutputDemo task runs on other 
  *     VxWorks system in the same physical network.
  *
  * RETURNS: OK or ERROR
  * 
  * EXAMPLE:
  *
  *     To run this etherOutputDemo task from the VxWorks shell do as follows: 
  *     -> sp (etherOutputDemo)
  *
  */
 
 STATUS etherOutputDemo ()
     {
     if (etBcast (INTERFACE_NAME) == ERROR)
         { 
         printf ("etherOutput broadcast failed\n");
         return (ERROR);
         }
     else
         printf ("etherOutputDemo completed\n"); 
     return (OK);
     }
 
 
 /*****************************************************************************
  * etBcast - Sends (broadcast) data on an ethernet network interface 
  *
  * RETURNS: OK or ERROR
  * 
  */
 
 STATUS etBcast 
     (
     char *ifname       /* name of the network interface eg. "ei0" */
     )
 
     {
     struct ether_header ethHdr;   /* ethernet header */
     struct ifnet *pIfnet; /*Pointer to your network interface's ifnet struct*/
 
     pIfnet = ifunit (ifname); /* get the ifnet pointer of your network 
                                * interface 
                                */
     if (pIfnet == (struct ifnet *) NULL)
 	{
 	printf ("ifunit failed\n");
 	return (ERROR);
 	}
 
     /* Set the value of destination host's ethernet address -
        here broadcast ethernet address is set */
     bcopy (etbcastaddr, ethHdr.ether_dhost, sizeof (ethHdr.ether_dhost));
     ethHdr.ether_type = htons (ET_TYPE); /* user defined protocol */
 
     printf ("Protocol type 0x%x \n\n", (u_short)ethHdr.ether_type);
     /* send (broadcast) message on an ethernet interface */
     if (etherOutput (pIfnet, ðHdr, etMessage, strlen (etMessage)) == ERROR)
         {
         perror ("etherOutput failed");
         return (ERROR);
         }
     else
         printf ("etherOutput done - message: %s \n", etMessage);
     return (OK);
     }