2 * getether.c : get the ethernet address of an interface
4 * All of this code is quite system-specific. As you may well
5 * guess, it took a good bit of detective work to figure out!
7 * If you figure out how to do this on another system,
8 * please let me know. <gwr@mc.com>
10 * $FreeBSD: src/libexec/bootpd/getether.c,v 1.9.2.3 2003/02/15 05:36:01 kris Exp $
11 * $DragonFly: src/libexec/bootpd/getether.c,v 1.3 2004/02/13 03:49:47 dillon Exp $
14 #include <sys/types.h>
15 #include <sys/socket.h>
30 #if defined(ultrix) || (defined(__osf__) && defined(__alpha))
32 * This is really easy on Ultrix! Thanks to
33 * Harald Lundberg <hl@tekla.fi> for this code.
35 * The code here is not specific to the Alpha, but that was the
36 * only symbol we could find to identify DEC's version of OSF.
37 * (Perhaps we should just define DEC in the Makefile... -gwr)
40 #include <sys/ioctl.h>
41 #include <net/if.h> /* struct ifdevea */
49 bzero(&phys
, sizeof(phys
));
50 strcpy(phys
.ifr_name
, ifname
);
51 if ((fd
= socket(AF_INET
, SOCK_DGRAM
, 0)) < 0) {
52 report(LOG_ERR
, "getether: socket(INET,DGRAM) failed");
55 if (ioctl(fd
, SIOCRPHYSADDR
, &phys
) < 0) {
56 report(LOG_ERR
, "getether: ioctl SIOCRPHYSADDR failed");
58 bcopy(&phys
.current_pa
[0], eap
, EALEN
);
66 #endif /* ultrix|osf1 */
71 #include <sys/sockio.h>
72 #include <sys/time.h> /* needed by net_if.h */
73 #include <net/nit_if.h> /* for NIOCBIND */
74 #include <net/if.h> /* for struct ifreq */
77 char *ifname
; /* interface name from ifconfig structure */
78 char *eap
; /* Ether address (output) */
85 bzero((char *) &ifrnit
, sizeof(ifrnit
));
86 strncpy(&ifrnit
.ifr_name
[0], ifname
, IFNAMSIZ
);
88 nit
= open("/dev/nit", 0);
90 report(LOG_ERR
, "getether: open /dev/nit: %s",
95 if (ioctl(nit
, NIOCBIND
, &ifrnit
) < 0) {
96 report(LOG_ERR
, "getether: NIOCBIND on nit");
99 if (ioctl(nit
, SIOCGIFADDR
, &ifrnit
) < 0) {
100 report(LOG_ERR
, "getether: SIOCGIFADDR on nit");
103 bcopy(&ifrnit
.ifr_addr
.sa_data
[0], eap
, EALEN
);
114 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
115 /* Thanks to John Brezak <brezak@ch.hp.com> for this code. */
116 #include <sys/ioctl.h>
117 #include <sys/time.h>
119 #include <net/if_dl.h>
120 #include <net/if_types.h>
123 getether(ifname
, eap
)
124 char *ifname
; /* interface name from ifconfig structure */
125 char *eap
; /* Ether address (output) */
129 struct ifreq ibuf
[16];
131 register struct ifreq
*ifrp
, *ifend
;
133 /* Fetch the interface configuration */
134 fd
= socket(AF_INET
, SOCK_DGRAM
, 0);
136 report(LOG_ERR
, "getether: socket %s: %s", ifname
, get_errmsg());
139 ifc
.ifc_len
= sizeof(ibuf
);
140 ifc
.ifc_buf
= (caddr_t
) ibuf
;
141 if (ioctl(fd
, SIOCGIFCONF
, (char *) &ifc
) < 0 ||
142 ifc
.ifc_len
< sizeof(struct ifreq
)) {
143 report(LOG_ERR
, "getether: SIOCGIFCONF: %s", get_errmsg());
146 /* Search interface configuration list for link layer address. */
148 ifend
= (struct ifreq
*) ((char *) ibuf
+ ifc
.ifc_len
);
149 while (ifrp
< ifend
) {
150 /* Look for interface */
151 if (strcmp(ifname
, ifrp
->ifr_name
) == 0 &&
152 ifrp
->ifr_addr
.sa_family
== AF_LINK
&&
153 ((struct sockaddr_dl
*) &ifrp
->ifr_addr
)->sdl_type
== IFT_ETHER
) {
154 bcopy(LLADDR((struct sockaddr_dl
*) &ifrp
->ifr_addr
), eap
, EALEN
);
158 /* Bump interface config pointer */
159 n
= ifrp
->ifr_addr
.sa_len
+ sizeof(ifrp
->ifr_name
);
160 if (n
< sizeof(*ifrp
))
162 ifrp
= (struct ifreq
*) ((char *) ifrp
+ n
);
171 #endif /* __NetBSD__ */
176 * This is for "Streams TCP/IP" by Lachman Associates.
177 * They sure made this cumbersome! -gwr
180 #include <sys/sockio.h>
181 #include <sys/dlpi.h>
189 getether(ifname
, eap
)
190 char *ifname
; /* interface name from ifconfig structure */
191 char *eap
; /* Ether address (output) */
195 char tmpbuf
[sizeof(union DL_primitives
) + 16];
198 union DL_primitives
*dlp
;
200 int unit
= -1; /* which unit to attach */
202 snprintf(devname
, sizeof(devname
), "%s%s", _PATH_DEV
, ifname
);
203 fd
= open(devname
, 2);
205 /* Try without the trailing digit. */
206 char *p
= devname
+ 5;
213 fd
= open(devname
, 2);
215 report(LOG_ERR
, "getether: open %s: %s",
216 devname
, get_errmsg());
222 * If this is a "Style 2" DLPI, then we must "attach" first
223 * to tell the driver which unit (board, port) we want.
224 * For now, decide this based on the device name.
225 * (Should do "info_req" and check dl_provider_style ...)
228 memset(tmpbuf
, 0, sizeof(tmpbuf
));
229 dlp
= (union DL_primitives
*) tmpbuf
;
230 dlp
->dl_primitive
= DL_ATTACH_REQ
;
231 dlp
->attach_req
.dl_ppa
= unit
;
233 cbuf
.len
= DL_ATTACH_REQ_SIZE
;
234 if (putmsg(fd
, &cbuf
, NULL
, 0) < 0) {
235 report(LOG_ERR
, "getether: attach: putmsg: %s", get_errmsg());
240 cbuf
.maxlen
= sizeof(tmpbuf
);
242 if (getmsg(fd
, &cbuf
, NULL
, &flags
) < 0) {
243 report(LOG_ERR
, "getether: attach: getmsg: %s", get_errmsg());
247 * Check the type, etc.
249 if (dlp
->dl_primitive
== DL_ERROR_ACK
) {
250 report(LOG_ERR
, "getether: attach: dlpi_errno=%d, unix_errno=%d",
251 dlp
->error_ack
.dl_errno
,
252 dlp
->error_ack
.dl_unix_errno
);
255 if (dlp
->dl_primitive
!= DL_OK_ACK
) {
256 report(LOG_ERR
, "getether: attach: not OK or ERROR");
260 #endif /* DL_ATTACH_REQ */
263 * Get the Ethernet address the same way the ARP module
264 * does when it is pushed onto a new stream (bind).
265 * One should instead be able just do an dl_info_req
266 * but many drivers do not supply the hardware address
267 * in the response to dl_info_req (they MUST supply it
268 * for dl_bind_ack because the ARP module requires it).
270 memset(tmpbuf
, 0, sizeof(tmpbuf
));
271 dlp
= (union DL_primitives
*) tmpbuf
;
272 dlp
->dl_primitive
= DL_BIND_REQ
;
273 dlp
->bind_req
.dl_sap
= 0x8FF; /* XXX - Unused SAP */
275 cbuf
.len
= DL_BIND_REQ_SIZE
;
276 if (putmsg(fd
, &cbuf
, NULL
, 0) < 0) {
277 report(LOG_ERR
, "getether: bind: putmsg: %s", get_errmsg());
282 cbuf
.maxlen
= sizeof(tmpbuf
);
284 if (getmsg(fd
, &cbuf
, NULL
, &flags
) < 0) {
285 report(LOG_ERR
, "getether: bind: getmsg: %s", get_errmsg());
289 * Check the type, etc.
291 if (dlp
->dl_primitive
== DL_ERROR_ACK
) {
292 report(LOG_ERR
, "getether: bind: dlpi_errno=%d, unix_errno=%d",
293 dlp
->error_ack
.dl_errno
,
294 dlp
->error_ack
.dl_unix_errno
);
297 if (dlp
->dl_primitive
!= DL_BIND_ACK
) {
298 report(LOG_ERR
, "getether: bind: not OK or ERROR");
301 if (dlp
->bind_ack
.dl_addr_offset
== 0) {
302 report(LOG_ERR
, "getether: bind: ack has no address");
305 if (dlp
->bind_ack
.dl_addr_length
< EALEN
) {
306 report(LOG_ERR
, "getether: bind: ack address truncated");
310 * Copy the Ethernet address out of the message.
312 enaddr
= tmpbuf
+ dlp
->bind_ack
.dl_addr_offset
;
313 memcpy(eap
, enaddr
, EALEN
);
327 * This is really easy on Linux! This version (for linux)
328 * written by Nigel Metheringham <nigelm@ohm.york.ac.uk> and
329 * updated by Pauline Middelink <middelin@polyware.iaf.nl>
331 * The code is almost identical to the Ultrix code - however
332 * the names are different to confuse the innocent :-)
333 * Most of this code was stolen from the Ultrix bit above.
337 #include <sys/ioctl.h>
338 #include <net/if.h> /* struct ifreq */
339 #include <sys/socketio.h> /* Needed for IOCTL defs */
342 getether(ifname
, eap
)
349 memset(&phys
, 0, sizeof(phys
));
350 strcpy(phys
.ifr_name
, ifname
);
351 if ((fd
= socket(AF_INET
, SOCK_DGRAM
, 0)) < 0) {
352 report(LOG_ERR
, "getether: socket(INET,DGRAM) failed");
355 if (ioctl(fd
, SIOCGIFHWADDR
, &phys
) < 0) {
356 report(LOG_ERR
, "getether: ioctl SIOCGIFHWADDR failed");
358 memcpy(eap
, &phys
.ifr_hwaddr
.sa_data
, EALEN
);
366 #endif /* __linux__ */
369 /* If we don't know how on this system, just return an error. */
372 getether(ifname
, eap
)
378 #endif /* !GETETHER */
384 * c-argdecl-indent: 4
385 * c-continued-statement-offset: 4
386 * c-continued-brace-offset: -4