Date: Mon, 6 Nov 2000 14:04:08 -0500 (EST) From: Luoqi Chen <luoqi@seven.watermarkgroup.com> To: emulation@FreeBSD.ORG, pfeifer@dbai.tuwien.ac.at, ports@FreeBSD.ORG Subject: Re: Wine port: How to obtain MAC address? Message-ID: <200011061904.OAA09537@seven.watermarkgroup.com> In-Reply-To: <Pine.BSF.4.30.0011061305430.64453-100000@taygeta.dbai.tuwien.ac.at>
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> For the Wine port I'd need to obtain the MAC address of an ethernet
> interface, alas it seems that this is not easily possible the way it
> is done in Linux/Solaris?
>
> For Linux, the code in Wine looks as follows:
>
> strcpy(ifInfo.ifr_name, ifName);
> if (ioctl(sock, SIOCGIFHWADDR, &ifInfo) < 0)
> {
> ERR ("Error obtaining MAC Address!\n");
> close(sock);
> return (-1);
> }
> else
> {
> /* FIXME: Is it correct to assume size of 6? */
> memcpy(IntInfo->if_physaddr, ifInfo.ifr_hwaddr.sa_data, 6);
> IntInfo->if_physaddrlen=6;
> }
>
> For FreeBSD I tried the following program, which doesn't really do what
> I want. If I use SIOCSIFPHYADDR, I get errno=22, and SIOCGIFADDR leads
> to a crash later on.
>
> Any hints? (Most probably I'm tried completely stupid things, but
> unfortunately, that part of the system is not really documented apart
> from the include files, so I had to take a guess&check approach. :-( )
>
There's no easy way (that I know of) to get the mac address in FreeBSD.
(time for a SIOCGIFLLADDR?) You may look at how ifconfig does it, but
I think the following method is a little bit easier:
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <stdio.h>
main()
{
struct ifconf ifc;
struct ifreq *ifr;
struct sockaddr_dl *sdl;
char buf[4096], *p;
int s;
s = socket(AF_INET, SOCK_DGRAM, 0);
if (s < 0)
err(-1, "socket");
ifc.ifc_len = sizeof buf;
ifc.ifc_buf = buf;
if (ioctl(s, SIOCGIFCONF, &ifc) < 0)
err(-1, "ioctl");
close(s);
for (p = buf; p < buf + ifc.ifc_len; ) {
ifr = (struct ifreq *)p;
if (ifr->ifr_addr.sa_family == AF_LINK) {
sdl = (struct sockaddr_dl *)&ifr->ifr_addr;
if (sdl->sdl_type == IFT_ETHER) {
unsigned char *ea = LLADDR(sdl);
printf("%s\t%x:%x:%x:%x:%x:%x\n", ifr->ifr_name,
ea[0], ea[1], ea[2], ea[3], ea[4], ea[5]);
}
}
p += _SIZEOF_ADDR_IFREQ(*ifr);
}
}
-lq
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