2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Berkeley Software Design Inc's name may not be used to endorse or
15 * promote products derived from this software without specific prior
18 * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * from BSDI kern.c,v 1.2 1998/11/25 22:38:27 don Exp
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include <sys/param.h>
37 #include <sys/mount.h>
38 #include <sys/queue.h>
39 #include <sys/socket.h>
42 #include <netinet/in.h>
43 #include <arpa/inet.h>
58 #include <nfs/nfsproto.h>
59 #include <nfs/nfs_lock.h>
62 #include "lockd_lock.h"
63 #include <nfsclient/nfs.h>
65 #define DAEMON_USERNAME "daemon"
67 /* Lock request owner. */
68 typedef struct __owner {
69 pid_t pid; /* Process ID. */
70 time_t tod; /* Time-of-day. */
74 static char hostname[MAXHOSTNAMELEN + 1]; /* Hostname. */
77 static void client_cleanup(void);
78 static const char *from_addr(struct sockaddr *);
79 int lock_request(LOCKD_MSG *);
80 static void set_auth(CLIENT *cl, struct xucred *ucred);
81 void show(LOCKD_MSG *);
82 int test_request(LOCKD_MSG *);
83 int unlock_request(LOCKD_MSG *);
86 nfslockdans(int vers, struct lockd_ans *ansp)
90 return (write(devfd, ansp, sizeof *ansp) <= 0);
94 * will break because fifo needs to be repopened when EOF'd
96 #define lockd_seteuid(uid) seteuid(uid)
98 #define d_calls (debug_level > 1)
99 #define d_args (debug_level > 2)
102 from_addr(struct sockaddr *saddr)
104 static char inet_buf[INET6_ADDRSTRLEN];
106 if (getnameinfo(saddr, saddr->sa_len, inet_buf, sizeof(inet_buf),
107 NULL, 0, NI_NUMERICHOST) == 0)
115 (void)lockd_seteuid(0);
121 * Loop around messages from the kernel, forwarding them off to
134 devfd = open(_PATH_DEV _PATH_NFSLCKDEV, O_RDWR | O_NONBLOCK);
136 syslog(LOG_ERR, "open: %s: %m", _PATH_NFSLCKDEV);
140 signal(SIGPIPE, SIG_IGN);
143 * Create a separate process, the client code is really a separate
144 * daemon that shares a lot of code.
146 switch (child = fork()) {
150 setproctitle("client");
153 setproctitle("server");
157 signal(SIGHUP, (sig_t)client_cleanup);
158 signal(SIGTERM, (sig_t)client_cleanup);
161 (void)time(&owner.tod);
162 owner.pid = getpid();
163 (void)gethostname(hostname, sizeof(hostname) - 1);
165 pw = getpwnam(DAEMON_USERNAME);
167 syslog(LOG_ERR, "getpwnam: %s: %m", DAEMON_USERNAME);
170 daemon_uid = pw->pw_uid;
171 /* drop our root privileges */
172 (void)lockd_seteuid(daemon_uid);
175 /* Read the fixed length message. */
176 if ((nr = read(devfd, &msg, sizeof(msg))) == sizeof(msg)) {
180 if (msg.lm_version != LOCKD_MSG_VERSION) {
182 "unknown msg type: %d", msg.lm_version);
185 * Send it to the NLM server and don't grant the lock
186 * if we fail for any reason.
188 switch (msg.lm_fl.l_type) {
192 ret = test_request(&msg);
194 ret = lock_request(&msg);
197 ret = unlock_request(&msg);
202 "unknown lock type: %d", msg.lm_fl.l_type);
206 struct lockd_ans ans;
208 ans.la_msg_ident = msg.lm_msg_ident;
209 ans.la_errno = EHOSTUNREACH;
211 if (nfslockdans(LOCKD_ANS_VERSION, &ans)) {
212 syslog((errno == EPIPE ? LOG_INFO :
213 LOG_ERR), "process %lu: %m",
214 (u_long)msg.lm_msg_ident.pid);
217 } else if (nr == -1) {
218 if (errno != EAGAIN) {
219 syslog(LOG_ERR, "read: %s: %m", _PATH_NFSLCKDEV);
222 } else if (nr != 0) {
224 "%s: discard %d bytes", _PATH_NFSLCKDEV, nr);
228 /* Reached only on error. */
230 (void)lockd_seteuid(0);
235 set_auth(CLIENT *cl, struct xucred *xucred)
239 ngroups = xucred->cr_ngroups - 1;
242 if (cl->cl_auth != NULL)
243 cl->cl_auth->ah_ops->ah_destroy(cl->cl_auth);
244 cl->cl_auth = authunix_create(hostname,
246 xucred->cr_groups[0],
248 &xucred->cr_groups[1]);
254 * Convert a lock LOCKD_MSG into an NLM request, and send it off.
257 test_request(LOCKD_MSG *msg)
260 struct timeval timeout = {0, 0}; /* No timeout, no response. */
264 syslog(LOG_DEBUG, "test request: %s: %s to %s",
265 msg->lm_nfsv3 ? "V4" : "V1/3",
266 msg->lm_fl.l_type == F_WRLCK ? "write" : "read",
267 from_addr((struct sockaddr *)&msg->lm_addr));
270 struct nlm4_testargs arg4;
272 arg4.cookie.n_bytes = (char *)&msg->lm_msg_ident;
273 arg4.cookie.n_len = sizeof(msg->lm_msg_ident);
274 arg4.exclusive = msg->lm_fl.l_type == F_WRLCK ? 1 : 0;
275 arg4.alock.caller_name = hostname;
276 arg4.alock.fh.n_bytes = (char *)&msg->lm_fh;
277 arg4.alock.fh.n_len = msg->lm_fh_len;
278 arg4.alock.oh.n_bytes = (char *)&owner;
279 arg4.alock.oh.n_len = sizeof(owner);
280 arg4.alock.svid = msg->lm_msg_ident.pid;
281 arg4.alock.l_offset = msg->lm_fl.l_start;
282 arg4.alock.l_len = msg->lm_fl.l_len;
284 if ((cli = get_client(
285 (struct sockaddr *)&msg->lm_addr,
289 set_auth(cli, &msg->lm_cred);
290 (void)clnt_call(cli, NLM_TEST_MSG,
291 (xdrproc_t)xdr_nlm4_testargs, &arg4,
292 (xdrproc_t)xdr_void, &dummy, timeout);
294 struct nlm_testargs arg;
296 arg.cookie.n_bytes = (char *)&msg->lm_msg_ident;
297 arg.cookie.n_len = sizeof(msg->lm_msg_ident);
298 arg.exclusive = msg->lm_fl.l_type == F_WRLCK ? 1 : 0;
299 arg.alock.caller_name = hostname;
300 arg.alock.fh.n_bytes = (char *)&msg->lm_fh;
301 arg.alock.fh.n_len = msg->lm_fh_len;
302 arg.alock.oh.n_bytes = (char *)&owner;
303 arg.alock.oh.n_len = sizeof(owner);
304 arg.alock.svid = msg->lm_msg_ident.pid;
305 arg.alock.l_offset = msg->lm_fl.l_start;
306 arg.alock.l_len = msg->lm_fl.l_len;
308 if ((cli = get_client(
309 (struct sockaddr *)&msg->lm_addr,
313 set_auth(cli, &msg->lm_cred);
314 (void)clnt_call(cli, NLM_TEST_MSG,
315 (xdrproc_t)xdr_nlm_testargs, &arg,
316 (xdrproc_t)xdr_void, &dummy, timeout);
323 * Convert a lock LOCKD_MSG into an NLM request, and send it off.
326 lock_request(LOCKD_MSG *msg)
329 struct nlm4_lockargs arg4;
330 struct nlm_lockargs arg;
331 struct timeval timeout = {0, 0}; /* No timeout, no response. */
335 syslog(LOG_DEBUG, "lock request: %s: %s to %s",
336 msg->lm_nfsv3 ? "V4" : "V1/3",
337 msg->lm_fl.l_type == F_WRLCK ? "write" : "read",
338 from_addr((struct sockaddr *)&msg->lm_addr));
341 arg4.cookie.n_bytes = (char *)&msg->lm_msg_ident;
342 arg4.cookie.n_len = sizeof(msg->lm_msg_ident);
343 arg4.block = msg->lm_wait ? 1 : 0;
344 arg4.exclusive = msg->lm_fl.l_type == F_WRLCK ? 1 : 0;
345 arg4.alock.caller_name = hostname;
346 arg4.alock.fh.n_bytes = (char *)&msg->lm_fh;
347 arg4.alock.fh.n_len = msg->lm_fh_len;
348 arg4.alock.oh.n_bytes = (char *)&owner;
349 arg4.alock.oh.n_len = sizeof(owner);
350 arg4.alock.svid = msg->lm_msg_ident.pid;
351 arg4.alock.l_offset = msg->lm_fl.l_start;
352 arg4.alock.l_len = msg->lm_fl.l_len;
354 arg4.state = nsm_state;
356 if ((cli = get_client(
357 (struct sockaddr *)&msg->lm_addr,
361 set_auth(cli, &msg->lm_cred);
362 (void)clnt_call(cli, NLM_LOCK_MSG,
363 (xdrproc_t)xdr_nlm4_lockargs, &arg4,
364 (xdrproc_t)xdr_void, &dummy, timeout);
366 arg.cookie.n_bytes = (char *)&msg->lm_msg_ident;
367 arg.cookie.n_len = sizeof(msg->lm_msg_ident);
368 arg.block = msg->lm_wait ? 1 : 0;
369 arg.exclusive = msg->lm_fl.l_type == F_WRLCK ? 1 : 0;
370 arg.alock.caller_name = hostname;
371 arg.alock.fh.n_bytes = (char *)&msg->lm_fh;
372 arg.alock.fh.n_len = msg->lm_fh_len;
373 arg.alock.oh.n_bytes = (char *)&owner;
374 arg.alock.oh.n_len = sizeof(owner);
375 arg.alock.svid = msg->lm_msg_ident.pid;
376 arg.alock.l_offset = msg->lm_fl.l_start;
377 arg.alock.l_len = msg->lm_fl.l_len;
379 arg.state = nsm_state;
381 if ((cli = get_client(
382 (struct sockaddr *)&msg->lm_addr,
386 set_auth(cli, &msg->lm_cred);
387 (void)clnt_call(cli, NLM_LOCK_MSG,
388 (xdrproc_t)xdr_nlm_lockargs, &arg,
389 (xdrproc_t)xdr_void, &dummy, timeout);
396 * Convert an unlock LOCKD_MSG into an NLM request, and send it off.
399 unlock_request(LOCKD_MSG *msg)
402 struct nlm4_unlockargs arg4;
403 struct nlm_unlockargs arg;
404 struct timeval timeout = {0, 0}; /* No timeout, no response. */
408 syslog(LOG_DEBUG, "unlock request: %s: to %s",
409 msg->lm_nfsv3 ? "V4" : "V1/3",
410 from_addr((struct sockaddr *)&msg->lm_addr));
413 arg4.cookie.n_bytes = (char *)&msg->lm_msg_ident;
414 arg4.cookie.n_len = sizeof(msg->lm_msg_ident);
415 arg4.alock.caller_name = hostname;
416 arg4.alock.fh.n_bytes = (char *)&msg->lm_fh;
417 arg4.alock.fh.n_len = msg->lm_fh_len;
418 arg4.alock.oh.n_bytes = (char *)&owner;
419 arg4.alock.oh.n_len = sizeof(owner);
420 arg4.alock.svid = msg->lm_msg_ident.pid;
421 arg4.alock.l_offset = msg->lm_fl.l_start;
422 arg4.alock.l_len = msg->lm_fl.l_len;
424 if ((cli = get_client(
425 (struct sockaddr *)&msg->lm_addr,
429 set_auth(cli, &msg->lm_cred);
430 (void)clnt_call(cli, NLM_UNLOCK_MSG,
431 (xdrproc_t)xdr_nlm4_unlockargs, &arg4,
432 (xdrproc_t)xdr_void, &dummy, timeout);
434 arg.cookie.n_bytes = (char *)&msg->lm_msg_ident;
435 arg.cookie.n_len = sizeof(msg->lm_msg_ident);
436 arg.alock.caller_name = hostname;
437 arg.alock.fh.n_bytes = (char *)&msg->lm_fh;
438 arg.alock.fh.n_len = msg->lm_fh_len;
439 arg.alock.oh.n_bytes = (char *)&owner;
440 arg.alock.oh.n_len = sizeof(owner);
441 arg.alock.svid = msg->lm_msg_ident.pid;
442 arg.alock.l_offset = msg->lm_fl.l_start;
443 arg.alock.l_len = msg->lm_fl.l_len;
445 if ((cli = get_client(
446 (struct sockaddr *)&msg->lm_addr,
450 set_auth(cli, &msg->lm_cred);
451 (void)clnt_call(cli, NLM_UNLOCK_MSG,
452 (xdrproc_t)xdr_nlm_unlockargs, &arg,
453 (xdrproc_t)xdr_void, &dummy, timeout);
460 lock_answer(int pid, netobj *netcookie, int result, int *pid_p, int version)
462 struct lockd_ans ans;
464 if (netcookie->n_len != sizeof(ans.la_msg_ident)) {
465 if (pid == -1) { /* we're screwed */
466 syslog(LOG_ERR, "inedible nlm cookie");
469 ans.la_msg_ident.pid = pid;
470 ans.la_msg_ident.msg_seq = -1;
472 memcpy(&ans.la_msg_ident, netcookie->n_bytes,
473 sizeof(ans.la_msg_ident));
477 syslog(LOG_DEBUG, "lock answer: pid %lu: %s %d",
478 (unsigned long)ans.la_msg_ident.pid,
479 version == NLM_VERS4 ? "nlmv4" : "nlmv3",
482 ans.la_set_getlk_pid = 0;
483 if (version == NLM_VERS4)
489 ans.la_errno = EACCES;
493 ans.la_errno = EAGAIN;
495 /* this is an answer to a nlm_test msg */
496 ans.la_set_getlk_pid = 1;
497 ans.la_getlk_pid = *pid_p;
501 case nlm4_denied_nolocks:
502 ans.la_errno = EAGAIN;
507 case nlm4_denied_grace_period:
508 ans.la_errno = EAGAIN;
511 ans.la_errno = EDEADLK;
514 ans.la_errno = EROFS;
517 ans.la_errno = ESTALE;
520 ans.la_errno = EFBIG;
523 ans.la_errno = EACCES;
532 ans.la_errno = EACCES;
536 ans.la_errno = EAGAIN;
538 /* this is an answer to a nlm_test msg */
539 ans.la_set_getlk_pid = 1;
540 ans.la_getlk_pid = *pid_p;
544 case nlm_denied_nolocks:
545 ans.la_errno = EAGAIN;
550 case nlm_denied_grace_period:
551 ans.la_errno = EAGAIN;
554 ans.la_errno = EDEADLK;
558 if (nfslockdans(LOCKD_ANS_VERSION, &ans)) {
559 syslog(((errno == EPIPE || errno == ESRCH) ?
561 "process %lu: %m", (u_long)ans.la_msg_ident.pid);
569 * Display the contents of a kernel LOCKD_MSG structure.
574 static char hex[] = "0123456789abcdef";
578 u_int8_t *p, *t, buf[NFS_SMALLFH*3+1];
580 syslog(LOG_DEBUG, "process ID: %lu\n", (long)mp->lm_msg_ident.pid);
582 fsidp = (fsid_t *)&mp->lm_fh;
583 fidp = (struct fid *)((u_int8_t *)&mp->lm_fh + sizeof(fsid_t));
585 for (t = buf, p = (u_int8_t *)mp->lm_fh,
587 len > 0; ++p, --len) {
589 *t++ = hex[(*p & 0xf0) >> 4];
590 *t++ = hex[*p & 0x0f];
594 syslog(LOG_DEBUG, "fh_len %d, fh %s\n", (int)mp->lm_fh_len, buf);
596 /* Show flock structure. */
597 syslog(LOG_DEBUG, "start %llu; len %llu; pid %lu; type %d; whence %d\n",
598 (unsigned long long)mp->lm_fl.l_start,
599 (unsigned long long)mp->lm_fl.l_len, (u_long)mp->lm_fl.l_pid,
600 mp->lm_fl.l_type, mp->lm_fl.l_whence);
602 /* Show wait flag. */
603 syslog(LOG_DEBUG, "wait was %s\n", mp->lm_wait ? "set" : "not set");