388 lines
9.1 KiB
C
388 lines
9.1 KiB
C
/*
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* getether.c : get the ethernet address of an interface
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*
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* All of this code is quite system-specific. As you may well
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* guess, it took a good bit of detective work to figure out!
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*
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* If you figure out how to do this on another system,
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* please let me know. <gwr@mc.com>
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*
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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#ifndef NO_UNISTD
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#include <unistd.h>
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#endif
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#include <ctype.h>
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#include <paths.h>
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#include <syslog.h>
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#include "getether.h"
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#include "report.h"
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#define EALEN 6
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#if defined(ultrix) || (defined(__osf__) && defined(__alpha))
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/*
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* This is really easy on Ultrix! Thanks to
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* Harald Lundberg <hl@tekla.fi> for this code.
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*
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* The code here is not specific to the Alpha, but that was the
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* only symbol we could find to identify DEC's version of OSF.
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* (Perhaps we should just define DEC in the Makefile... -gwr)
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*/
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#include <sys/ioctl.h>
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#include <net/if.h> /* struct ifdevea */
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getether(ifname, eap)
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char *ifname, *eap;
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{
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int rc = -1;
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int fd;
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struct ifdevea phys;
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bzero(&phys, sizeof(phys));
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strcpy(phys.ifr_name, ifname);
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if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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report(LOG_ERR, "getether: socket(INET,DGRAM) failed");
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return -1;
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}
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if (ioctl(fd, SIOCRPHYSADDR, &phys) < 0) {
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report(LOG_ERR, "getether: ioctl SIOCRPHYSADDR failed");
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} else {
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bcopy(&phys.current_pa[0], eap, EALEN);
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rc = 0;
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}
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close(fd);
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return rc;
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}
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#define GETETHER
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#endif /* ultrix|osf1 */
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#ifdef SUNOS
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#include <sys/sockio.h>
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#include <sys/time.h> /* needed by net_if.h */
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#include <net/nit_if.h> /* for NIOCBIND */
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#include <net/if.h> /* for struct ifreq */
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getether(ifname, eap)
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char *ifname; /* interface name from ifconfig structure */
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char *eap; /* Ether address (output) */
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{
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int rc = -1;
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struct ifreq ifrnit;
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int nit;
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bzero((char *) &ifrnit, sizeof(ifrnit));
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strncpy(&ifrnit.ifr_name[0], ifname, IFNAMSIZ);
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nit = open("/dev/nit", 0);
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if (nit < 0) {
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report(LOG_ERR, "getether: open /dev/nit: %s",
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get_errmsg());
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return rc;
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}
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do {
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if (ioctl(nit, NIOCBIND, &ifrnit) < 0) {
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report(LOG_ERR, "getether: NIOCBIND on nit");
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break;
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}
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if (ioctl(nit, SIOCGIFADDR, &ifrnit) < 0) {
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report(LOG_ERR, "getether: SIOCGIFADDR on nit");
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break;
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}
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bcopy(&ifrnit.ifr_addr.sa_data[0], eap, EALEN);
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rc = 0;
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} while (0);
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close(nit);
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return rc;
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}
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#define GETETHER
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#endif /* SUNOS */
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#if defined(__FreeBSD__) || defined(__NetBSD__)
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/* Thanks to John Brezak <brezak@ch.hp.com> for this code. */
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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getether(ifname, eap)
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char *ifname; /* interface name from ifconfig structure */
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char *eap; /* Ether address (output) */
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{
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int fd, rc = -1;
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register int n;
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struct ifreq ibuf[16], ifr;
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struct ifconf ifc;
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register struct ifreq *ifrp, *ifend;
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/* Fetch the interface configuration */
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fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (fd < 0) {
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report(LOG_ERR, "getether: socket %s: %s", ifname, get_errmsg());
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return (fd);
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}
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ifc.ifc_len = sizeof(ibuf);
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ifc.ifc_buf = (caddr_t) ibuf;
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if (ioctl(fd, SIOCGIFCONF, (char *) &ifc) < 0 ||
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ifc.ifc_len < sizeof(struct ifreq)) {
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report(LOG_ERR, "getether: SIOCGIFCONF: %s", get_errmsg);
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goto out;
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}
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/* Search interface configuration list for link layer address. */
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ifrp = ibuf;
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ifend = (struct ifreq *) ((char *) ibuf + ifc.ifc_len);
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while (ifrp < ifend) {
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/* Look for interface */
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if (strcmp(ifname, ifrp->ifr_name) == 0 &&
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ifrp->ifr_addr.sa_family == AF_LINK &&
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((struct sockaddr_dl *) &ifrp->ifr_addr)->sdl_type == IFT_ETHER) {
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bcopy(LLADDR((struct sockaddr_dl *) &ifrp->ifr_addr), eap, EALEN);
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rc = 0;
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break;
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}
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/* Bump interface config pointer */
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n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name);
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if (n < sizeof(*ifrp))
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n = sizeof(*ifrp);
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ifrp = (struct ifreq *) ((char *) ifrp + n);
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}
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out:
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close(fd);
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return (rc);
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}
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#define GETETHER
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#endif /* __NetBSD__ */
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#ifdef SVR4
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/*
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* This is for "Streams TCP/IP" by Lachman Associates.
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* They sure made this cumbersome! -gwr
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*/
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#include <sys/sockio.h>
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#include <sys/dlpi.h>
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#include <stropts.h>
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#include <string.h>
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#ifndef NULL
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#define NULL 0
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#endif
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int
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getether(ifname, eap)
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char *ifname; /* interface name from ifconfig structure */
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char *eap; /* Ether address (output) */
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{
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int rc = -1;
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char devname[32];
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char tmpbuf[sizeof(union DL_primitives) + 16];
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struct strbuf cbuf;
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int fd, flags;
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union DL_primitives *dlp;
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char *enaddr;
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int unit = -1; /* which unit to attach */
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snprintf(devname, sizeof(devname), "%s%s", _PATH_DEV, ifname);
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fd = open(devname, 2);
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if (fd < 0) {
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/* Try without the trailing digit. */
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char *p = devname + 5;
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while (isalpha(*p))
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p++;
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if (isdigit(*p)) {
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unit = *p - '0';
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*p = '\0';
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}
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fd = open(devname, 2);
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if (fd < 0) {
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report(LOG_ERR, "getether: open %s: %s",
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devname, get_errmsg());
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return rc;
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}
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}
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#ifdef DL_ATTACH_REQ
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/*
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* If this is a "Style 2" DLPI, then we must "attach" first
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* to tell the driver which unit (board, port) we want.
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* For now, decide this based on the device name.
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* (Should do "info_req" and check dl_provider_style ...)
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*/
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if (unit >= 0) {
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memset(tmpbuf, 0, sizeof(tmpbuf));
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dlp = (union DL_primitives *) tmpbuf;
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dlp->dl_primitive = DL_ATTACH_REQ;
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dlp->attach_req.dl_ppa = unit;
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cbuf.buf = tmpbuf;
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cbuf.len = DL_ATTACH_REQ_SIZE;
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if (putmsg(fd, &cbuf, NULL, 0) < 0) {
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report(LOG_ERR, "getether: attach: putmsg: %s", get_errmsg());
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goto out;
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}
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/* Recv the ack. */
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cbuf.buf = tmpbuf;
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cbuf.maxlen = sizeof(tmpbuf);
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flags = 0;
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if (getmsg(fd, &cbuf, NULL, &flags) < 0) {
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report(LOG_ERR, "getether: attach: getmsg: %s", get_errmsg());
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goto out;
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}
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/*
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* Check the type, etc.
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*/
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if (dlp->dl_primitive == DL_ERROR_ACK) {
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report(LOG_ERR, "getether: attach: dlpi_errno=%d, unix_errno=%d",
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dlp->error_ack.dl_errno,
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dlp->error_ack.dl_unix_errno);
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goto out;
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}
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if (dlp->dl_primitive != DL_OK_ACK) {
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report(LOG_ERR, "getether: attach: not OK or ERROR");
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goto out;
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}
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} /* unit >= 0 */
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#endif /* DL_ATTACH_REQ */
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/*
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* Get the Ethernet address the same way the ARP module
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* does when it is pushed onto a new stream (bind).
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* One should instead be able just do an dl_info_req
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* but many drivers do not supply the hardware address
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* in the response to dl_info_req (they MUST supply it
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* for dl_bind_ack because the ARP module requires it).
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*/
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memset(tmpbuf, 0, sizeof(tmpbuf));
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dlp = (union DL_primitives *) tmpbuf;
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dlp->dl_primitive = DL_BIND_REQ;
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dlp->bind_req.dl_sap = 0x8FF; /* XXX - Unused SAP */
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cbuf.buf = tmpbuf;
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cbuf.len = DL_BIND_REQ_SIZE;
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if (putmsg(fd, &cbuf, NULL, 0) < 0) {
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report(LOG_ERR, "getether: bind: putmsg: %s", get_errmsg());
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goto out;
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}
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/* Recv the ack. */
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cbuf.buf = tmpbuf;
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cbuf.maxlen = sizeof(tmpbuf);
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flags = 0;
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if (getmsg(fd, &cbuf, NULL, &flags) < 0) {
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report(LOG_ERR, "getether: bind: getmsg: %s", get_errmsg());
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goto out;
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}
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/*
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* Check the type, etc.
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*/
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if (dlp->dl_primitive == DL_ERROR_ACK) {
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report(LOG_ERR, "getether: bind: dlpi_errno=%d, unix_errno=%d",
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dlp->error_ack.dl_errno,
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dlp->error_ack.dl_unix_errno);
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goto out;
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}
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if (dlp->dl_primitive != DL_BIND_ACK) {
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report(LOG_ERR, "getether: bind: not OK or ERROR");
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goto out;
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}
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if (dlp->bind_ack.dl_addr_offset == 0) {
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report(LOG_ERR, "getether: bind: ack has no address");
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goto out;
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}
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if (dlp->bind_ack.dl_addr_length < EALEN) {
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report(LOG_ERR, "getether: bind: ack address truncated");
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goto out;
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}
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/*
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* Copy the Ethernet address out of the message.
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*/
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enaddr = tmpbuf + dlp->bind_ack.dl_addr_offset;
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memcpy(eap, enaddr, EALEN);
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rc = 0;
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out:
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close(fd);
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return rc;
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}
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#define GETETHER
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#endif /* SVR4 */
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#ifdef __linux__
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/*
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* This is really easy on Linux! This version (for linux)
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* written by Nigel Metheringham <nigelm@ohm.york.ac.uk> and
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* updated by Pauline Middelink <middelin@polyware.iaf.nl>
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*
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* The code is almost identical to the Ultrix code - however
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* the names are different to confuse the innocent :-)
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* Most of this code was stolen from the Ultrix bit above.
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*/
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#include <memory.h>
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#include <sys/ioctl.h>
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#include <net/if.h> /* struct ifreq */
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#include <sys/socketio.h> /* Needed for IOCTL defs */
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int
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getether(ifname, eap)
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char *ifname, *eap;
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{
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int rc = -1;
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int fd;
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struct ifreq phys;
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memset(&phys, 0, sizeof(phys));
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strcpy(phys.ifr_name, ifname);
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if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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report(LOG_ERR, "getether: socket(INET,DGRAM) failed");
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return -1;
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}
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if (ioctl(fd, SIOCGIFHWADDR, &phys) < 0) {
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report(LOG_ERR, "getether: ioctl SIOCGIFHWADDR failed");
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} else {
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memcpy(eap, &phys.ifr_hwaddr.sa_data, EALEN);
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rc = 0;
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}
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close(fd);
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return rc;
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}
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#define GETETHER
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#endif /* __linux__ */
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/* If we don't know how on this system, just return an error. */
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#ifndef GETETHER
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int
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getether(ifname, eap)
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char *ifname, *eap;
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{
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return -1;
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}
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#endif /* !GETETHER */
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/*
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* Local Variables:
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* tab-width: 4
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* c-indent-level: 4
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* c-argdecl-indent: 4
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* c-continued-statement-offset: 4
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* c-continued-brace-offset: -4
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* c-label-offset: -4
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* c-brace-offset: 0
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* End:
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*/
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