Date: Sat, 26 Jun 2004 13:51:16 +0100 From: Doug Rabson <dfr@nlsystems.com> To: freebsd-hackers@freebsd.org Cc: Ivan Voras <ivoras@fer.hr> Subject: Re: Getting MAC address? Message-ID: <200406261351.16778.dfr@nlsystems.com> In-Reply-To: <40DD3EC1.9000106@fer.hr> References: <40DCC57F.5090209@fer.hr> <20040626104947.T93253@woozle.rinet.ru> <40DD3EC1.9000106@fer.hr>
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On Saturday 26 June 2004 10:15, Ivan Voras wrote: > Dmitry Morozovsky wrote: > > On Sat, 26 Jun 2004, Ivan Voras wrote: > > > > IV> How to get the MAC address for an (ethernet) interface? The > > linux code IV> does this: > > IV> retval = ioctl(thisint->sockInt, SIOCGIFHWADDR, &ifr); > > IV> > > IV> After some searching, I found SIOCSIFLLADDR ioctl, but it > > appears there IV> isn't a "GET" counterpart. > > IV> > > IV> (I've got interface name & index available...) > > > > Take a look at ifconfig(8) source. > > > > getifaddrs(3), case when sa_family == AF_LINK > > I was looking at it and came across getifaddrs(). This function does > not depend on a open socket (yes, mine is AF_LINK, sockaddr_dl), and > apparently returns a list of all interfaces. Is there really no other > way than to traverse this list? Its really not that hard: static void getNodeID(uint8_t node[6]) { struct ifaddrs *ifap; if (getifaddrs(&ifap) == 0) { struct ifaddrs *p; for (p = ifap; p; p = p->ifa_next) { if (p->ifa_addr->sa_family == AF_LINK) { struct sockaddr_dl* sdp = (struct sockaddr_dl*) p->ifa_addr; memcpy(node, sdp->sdl_data + sdp->sdl_nlen, 6); freeifaddrs(ifap); return; } } freeifaddrs(ifap); } }
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