/libexec/bootpd/getether.c
C | 389 lines | 278 code | 36 blank | 75 comment | 41 complexity | 6e2edf3d2ba11d8f43ba9b7abca76c8f MD5 | raw file
- /*
- * getether.c : get the ethernet address of an interface
- *
- * All of this code is quite system-specific. As you may well
- * guess, it took a good bit of detective work to figure out!
- *
- * If you figure out how to do this on another system,
- * please let me know. <gwr@mc.com>
- *
- * $FreeBSD$
- */
- #include <sys/types.h>
- #include <sys/socket.h>
- #ifndef NO_UNISTD
- #include <unistd.h>
- #endif
- #include <ctype.h>
- #include <paths.h>
- #include <string.h>
- #include <syslog.h>
- #include "getether.h"
- #include "report.h"
- #define EALEN 6
- #if defined(ultrix) || (defined(__osf__) && defined(__alpha))
- /*
- * This is really easy on Ultrix! Thanks to
- * Harald Lundberg <hl@tekla.fi> for this code.
- *
- * The code here is not specific to the Alpha, but that was the
- * only symbol we could find to identify DEC's version of OSF.
- * (Perhaps we should just define DEC in the Makefile... -gwr)
- */
- #include <sys/ioctl.h>
- #include <net/if.h> /* struct ifdevea */
- getether(ifname, eap)
- char *ifname, *eap;
- {
- int rc = -1;
- int fd;
- struct ifdevea phys;
- bzero(&phys, sizeof(phys));
- strcpy(phys.ifr_name, ifname);
- if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
- report(LOG_ERR, "getether: socket(INET,DGRAM) failed");
- return -1;
- }
- if (ioctl(fd, SIOCRPHYSADDR, &phys) < 0) {
- report(LOG_ERR, "getether: ioctl SIOCRPHYSADDR failed");
- } else {
- bcopy(&phys.current_pa[0], eap, EALEN);
- rc = 0;
- }
- close(fd);
- return rc;
- }
- #define GETETHER
- #endif /* ultrix|osf1 */
- #ifdef SUNOS
- #include <sys/sockio.h>
- #include <sys/time.h> /* needed by net_if.h */
- #include <net/nit_if.h> /* for NIOCBIND */
- #include <net/if.h> /* for struct ifreq */
- getether(ifname, eap)
- char *ifname; /* interface name from ifconfig structure */
- char *eap; /* Ether address (output) */
- {
- int rc = -1;
- struct ifreq ifrnit;
- int nit;
- bzero((char *) &ifrnit, sizeof(ifrnit));
- strlcpy(&ifrnit.ifr_name[0], ifname, IFNAMSIZ);
- nit = open("/dev/nit", 0);
- if (nit < 0) {
- report(LOG_ERR, "getether: open /dev/nit: %s",
- get_errmsg());
- return rc;
- }
- do {
- if (ioctl(nit, NIOCBIND, &ifrnit) < 0) {
- report(LOG_ERR, "getether: NIOCBIND on nit");
- break;
- }
- if (ioctl(nit, SIOCGIFADDR, &ifrnit) < 0) {
- report(LOG_ERR, "getether: SIOCGIFADDR on nit");
- break;
- }
- bcopy(&ifrnit.ifr_addr.sa_data[0], eap, EALEN);
- rc = 0;
- } while (0);
- close(nit);
- return rc;
- }
- #define GETETHER
- #endif /* SUNOS */
- #if defined(__FreeBSD__) || defined(__NetBSD__)
- /* Thanks to John Brezak <brezak@ch.hp.com> for this code. */
- #include <sys/ioctl.h>
- #include <sys/time.h>
- #include <net/if.h>
- #include <net/if_dl.h>
- #include <net/if_types.h>
- int
- getether(ifname, eap)
- char *ifname; /* interface name from ifconfig structure */
- char *eap; /* Ether address (output) */
- {
- int fd, rc = -1;
- register int n;
- struct ifreq ibuf[16];
- struct ifconf ifc;
- register struct ifreq *ifrp, *ifend;
- /* Fetch the interface configuration */
- fd = socket(AF_INET, SOCK_DGRAM, 0);
- if (fd < 0) {
- report(LOG_ERR, "getether: socket %s: %s", ifname, get_errmsg());
- return (fd);
- }
- ifc.ifc_len = sizeof(ibuf);
- ifc.ifc_buf = (caddr_t) ibuf;
- if (ioctl(fd, SIOCGIFCONF, (char *) &ifc) < 0 ||
- ifc.ifc_len < sizeof(struct ifreq)) {
- report(LOG_ERR, "getether: SIOCGIFCONF: %s", get_errmsg());
- goto out;
- }
- /* Search interface configuration list for link layer address. */
- ifrp = ibuf;
- ifend = (struct ifreq *) ((char *) ibuf + ifc.ifc_len);
- while (ifrp < ifend) {
- /* Look for interface */
- if (strcmp(ifname, ifrp->ifr_name) == 0 &&
- ifrp->ifr_addr.sa_family == AF_LINK &&
- ((struct sockaddr_dl *) &ifrp->ifr_addr)->sdl_type == IFT_ETHER) {
- bcopy(LLADDR((struct sockaddr_dl *) &ifrp->ifr_addr), eap, EALEN);
- rc = 0;
- break;
- }
- /* Bump interface config pointer */
- n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name);
- if (n < sizeof(*ifrp))
- n = sizeof(*ifrp);
- ifrp = (struct ifreq *) ((char *) ifrp + n);
- }
- out:
- close(fd);
- return (rc);
- }
- #define GETETHER
- #endif /* __NetBSD__ */
- #ifdef SVR4
- /*
- * This is for "Streams TCP/IP" by Lachman Associates.
- * They sure made this cumbersome! -gwr
- */
- #include <sys/sockio.h>
- #include <sys/dlpi.h>
- #include <stropts.h>
- #include <string.h>
- #ifndef NULL
- #define NULL 0
- #endif
- int
- getether(ifname, eap)
- char *ifname; /* interface name from ifconfig structure */
- char *eap; /* Ether address (output) */
- {
- int rc = -1;
- char devname[32];
- char tmpbuf[sizeof(union DL_primitives) + 16];
- struct strbuf cbuf;
- int fd, flags;
- union DL_primitives *dlp;
- char *enaddr;
- int unit = -1; /* which unit to attach */
- snprintf(devname, sizeof(devname), "%s%s", _PATH_DEV, ifname);
- fd = open(devname, 2);
- if (fd < 0) {
- /* Try without the trailing digit. */
- char *p = devname + 5;
- while (isalpha(*p))
- p++;
- if (isdigit(*p)) {
- unit = *p - '0';
- *p = '\0';
- }
- fd = open(devname, 2);
- if (fd < 0) {
- report(LOG_ERR, "getether: open %s: %s",
- devname, get_errmsg());
- return rc;
- }
- }
- #ifdef DL_ATTACH_REQ
- /*
- * If this is a "Style 2" DLPI, then we must "attach" first
- * to tell the driver which unit (board, port) we want.
- * For now, decide this based on the device name.
- * (Should do "info_req" and check dl_provider_style ...)
- */
- if (unit >= 0) {
- memset(tmpbuf, 0, sizeof(tmpbuf));
- dlp = (union DL_primitives *) tmpbuf;
- dlp->dl_primitive = DL_ATTACH_REQ;
- dlp->attach_req.dl_ppa = unit;
- cbuf.buf = tmpbuf;
- cbuf.len = DL_ATTACH_REQ_SIZE;
- if (putmsg(fd, &cbuf, NULL, 0) < 0) {
- report(LOG_ERR, "getether: attach: putmsg: %s", get_errmsg());
- goto out;
- }
- /* Recv the ack. */
- cbuf.buf = tmpbuf;
- cbuf.maxlen = sizeof(tmpbuf);
- flags = 0;
- if (getmsg(fd, &cbuf, NULL, &flags) < 0) {
- report(LOG_ERR, "getether: attach: getmsg: %s", get_errmsg());
- goto out;
- }
- /*
- * Check the type, etc.
- */
- if (dlp->dl_primitive == DL_ERROR_ACK) {
- report(LOG_ERR, "getether: attach: dlpi_errno=%d, unix_errno=%d",
- dlp->error_ack.dl_errno,
- dlp->error_ack.dl_unix_errno);
- goto out;
- }
- if (dlp->dl_primitive != DL_OK_ACK) {
- report(LOG_ERR, "getether: attach: not OK or ERROR");
- goto out;
- }
- } /* unit >= 0 */
- #endif /* DL_ATTACH_REQ */
- /*
- * Get the Ethernet address the same way the ARP module
- * does when it is pushed onto a new stream (bind).
- * One should instead be able just do a dl_info_req
- * but many drivers do not supply the hardware address
- * in the response to dl_info_req (they MUST supply it
- * for dl_bind_ack because the ARP module requires it).
- */
- memset(tmpbuf, 0, sizeof(tmpbuf));
- dlp = (union DL_primitives *) tmpbuf;
- dlp->dl_primitive = DL_BIND_REQ;
- dlp->bind_req.dl_sap = 0x8FF; /* XXX - Unused SAP */
- cbuf.buf = tmpbuf;
- cbuf.len = DL_BIND_REQ_SIZE;
- if (putmsg(fd, &cbuf, NULL, 0) < 0) {
- report(LOG_ERR, "getether: bind: putmsg: %s", get_errmsg());
- goto out;
- }
- /* Recv the ack. */
- cbuf.buf = tmpbuf;
- cbuf.maxlen = sizeof(tmpbuf);
- flags = 0;
- if (getmsg(fd, &cbuf, NULL, &flags) < 0) {
- report(LOG_ERR, "getether: bind: getmsg: %s", get_errmsg());
- goto out;
- }
- /*
- * Check the type, etc.
- */
- if (dlp->dl_primitive == DL_ERROR_ACK) {
- report(LOG_ERR, "getether: bind: dlpi_errno=%d, unix_errno=%d",
- dlp->error_ack.dl_errno,
- dlp->error_ack.dl_unix_errno);
- goto out;
- }
- if (dlp->dl_primitive != DL_BIND_ACK) {
- report(LOG_ERR, "getether: bind: not OK or ERROR");
- goto out;
- }
- if (dlp->bind_ack.dl_addr_offset == 0) {
- report(LOG_ERR, "getether: bind: ack has no address");
- goto out;
- }
- if (dlp->bind_ack.dl_addr_length < EALEN) {
- report(LOG_ERR, "getether: bind: ack address truncated");
- goto out;
- }
- /*
- * Copy the Ethernet address out of the message.
- */
- enaddr = tmpbuf + dlp->bind_ack.dl_addr_offset;
- memcpy(eap, enaddr, EALEN);
- rc = 0;
- out:
- close(fd);
- return rc;
- }
- #define GETETHER
- #endif /* SVR4 */
- #ifdef __linux__
- /*
- * This is really easy on Linux! This version (for linux)
- * written by Nigel Metheringham <nigelm@ohm.york.ac.uk> and
- * updated by Pauline Middelink <middelin@polyware.iaf.nl>
- *
- * The code is almost identical to the Ultrix code - however
- * the names are different to confuse the innocent :-)
- * Most of this code was stolen from the Ultrix bit above.
- */
- #include <memory.h>
- #include <sys/ioctl.h>
- #include <net/if.h> /* struct ifreq */
- #include <sys/socketio.h> /* Needed for IOCTL defs */
- int
- getether(ifname, eap)
- char *ifname, *eap;
- {
- int rc = -1;
- int fd;
- struct ifreq phys;
- memset(&phys, 0, sizeof(phys));
- strcpy(phys.ifr_name, ifname);
- if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
- report(LOG_ERR, "getether: socket(INET,DGRAM) failed");
- return -1;
- }
- if (ioctl(fd, SIOCGIFHWADDR, &phys) < 0) {
- report(LOG_ERR, "getether: ioctl SIOCGIFHWADDR failed");
- } else {
- memcpy(eap, &phys.ifr_hwaddr.sa_data, EALEN);
- rc = 0;
- }
- close(fd);
- return rc;
- }
- #define GETETHER
- #endif /* __linux__ */
- /* If we don't know how on this system, just return an error. */
- #ifndef GETETHER
- int
- getether(ifname, eap)
- char *ifname, *eap;
- {
- return -1;
- }
- #endif /* !GETETHER */
- /*
- * Local Variables:
- * tab-width: 4
- * c-indent-level: 4
- * c-argdecl-indent: 4
- * c-continued-statement-offset: 4
- * c-continued-brace-offset: -4
- * c-label-offset: -4
- * c-brace-offset: 0
- * End:
- */