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From: thomas@mipsbx.nac.dec.com (Matt Thomas)
Newsgroups: comp.sys.dec
Subject: Re: Getting ETHERNET address of VAX adapter
Message-ID: <10272@shlump.nac.dec.com>
Date: 13 Apr 90 17:31:06 GMT
References: <10847@cbmvax.commodore.com> <3431.26246304@fps.mcw.edu>
Sender: news@shlump.nac.dec.com
Reply-To: thomas@wrl.dec.com
Organization: Digital Equipment Corporation
Lines: 78


> This is ALMOST a really stupid question....
> How does one go about finding out the ethernet address of the
> ethernet adapter of a VAX?  (via software, that is...)
> 
> With NCP, etc., I can easily see the addresses of the SERVERS,
> but stuff like SHOW EXEC CHAR doesn't tell me what I need to know.

Try this program.  It will list any interface that has an physical
address (which may not be limited to just Ethernet adapters).

#include <stdio.h>			/* standard I/O */
#include <errno.h>			/* error numbers */
#include <time.h>			/* time definitions */
#include <sys/types.h>			/* system types */
#include <sys/socket.h>			/* socket stuff */
#include <sys/ioctl.h>			/* ioctls */
#include <net/if.h>			/* generic interface structs */

extern	char	*optarg;
extern	int	optind;
extern	char	*sys_errlist[];

main( argc, argv )
	int argc;
	char *argv[];
{
    struct ifdevea devea;
    struct ifreq *ifr, ifreqs[32];
    struct ifconf ifc;
    int s, i;

    bzero(&devea, sizeof(devea));

    /*  we need a socket -- any old socket will do.  */
    s = socket(AF_UNIX, SOCK_DGRAM, 0);
    if (s < 0) {
	perror("socket");
	exit(1);
    }

    ifc.ifc_req = ifreqs;
    ifc.ifc_len = sizeof(ifreqs);
    if (ioctl(s, SIOCGIFCONF, &ifc) < 0) {
	perror("siocgifconf");
	exit(1);
    }

    for (ifr = ifreqs; ifc.ifc_len > 0; ifr++, ifc.ifc_len -= sizeof(*ifr)) {
	if (strcmp(devea.ifr_name, ifr->ifr_name)) {
	    (void) strcpy(devea.ifr_name, ifr->ifr_name);
	    /* read the address of the interface */
	    if (ioctl(s, SIOCRPHYSADDR, &devea) < 0)  {
		/* error? */
		if  (errno != EOPNOTSUPP && errno |= EINVAL) {
		    /* unexpected error */
		    perror(devea.ifr_name);
		}
		continue;
	    }
	    printf("%s: ", devea.ifr_name);
	    printf("current = %02x-%02x-%02x-%02x-%02x-%02x, ",
		devea.current_pa[0], devea.current_pa[1], devea.current_pa[2], 
		devea.current_pa[3], devea.current_pa[4], devea.current_pa[5]
		);
	    printf("default = %02x-%02x-%02x-%02x-%02x-%02x\n",
		devea.default_pa[0], devea.default_pa[1], devea.default_pa[2], 
		devea.default_pa[3], devea.default_pa[4], devea.default_pa[5]
		);
	}
    }
}

-- 
Matt Thomas                     Internet:   thomas@wrl.dec.com
DECnet-ULTRIX Development       UUCP:       ...!decwrl!thomas
Digital Equipment Corporation   Disclaimer: This message reflects my own
Littleton, MA                               warped views, etc.