2 * Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. Berkeley Software Design Inc's name may not be used to endorse or
13 * promote products derived from this software without specific prior
16 * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * from BSDI kern.c,v 1.2 1998/11/25 22:38:27 don Exp
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
35 #include <sys/mount.h>
36 #include <sys/queue.h>
37 #include <sys/socket.h>
40 #include <netinet/in.h>
41 #include <arpa/inet.h>
56 #include <nfs/nfsproto.h>
57 #include <nfs/nfs_lock.h>
60 #include "lockd_lock.h"
61 #include <nfsclient/nfs.h>
63 #define DAEMON_USERNAME "daemon"
65 /* Lock request owner. */
66 typedef struct __owner {
67 pid_t pid; /* Process ID. */
68 time_t tod; /* Time-of-day. */
72 static char hostname[MAXHOSTNAMELEN + 1]; /* Hostname. */
75 static void client_cleanup(void);
76 static const char *from_addr(struct sockaddr *);
77 int lock_request(LOCKD_MSG *);
78 static void set_auth(CLIENT *cl, struct xucred *ucred);
79 void show(LOCKD_MSG *);
80 int test_request(LOCKD_MSG *);
81 int unlock_request(LOCKD_MSG *);
84 nfslockdans(int vers, struct lockd_ans *ansp)
88 return (write(devfd, ansp, sizeof *ansp) <= 0);
92 * will break because fifo needs to be repopened when EOF'd
94 #define lockd_seteuid(uid) seteuid(uid)
96 #define d_calls (debug_level > 1)
97 #define d_args (debug_level > 2)
101 struct sockaddr *saddr;
103 static char inet_buf[INET6_ADDRSTRLEN];
105 if (getnameinfo(saddr, saddr->sa_len, inet_buf, sizeof(inet_buf),
106 NULL, 0, NI_NUMERICHOST) == 0)
114 (void)lockd_seteuid(0);
120 * Loop around messages from the kernel, forwarding them off to
133 devfd = open(_PATH_DEV _PATH_NFSLCKDEV, O_RDWR | O_NONBLOCK);
135 syslog(LOG_ERR, "open: %s: %m", _PATH_NFSLCKDEV);
139 signal(SIGPIPE, SIG_IGN);
142 * Create a separate process, the client code is really a separate
143 * daemon that shares a lot of code.
145 switch (child = fork()) {
149 setproctitle("client");
152 setproctitle("server");
156 signal(SIGHUP, (sig_t)client_cleanup);
157 signal(SIGTERM, (sig_t)client_cleanup);
160 (void)time(&owner.tod);
161 owner.pid = getpid();
162 (void)gethostname(hostname, sizeof(hostname) - 1);
164 pw = getpwnam(DAEMON_USERNAME);
166 syslog(LOG_ERR, "getpwnam: %s: %m", DAEMON_USERNAME);
169 daemon_uid = pw->pw_uid;
170 /* drop our root privileges */
171 (void)lockd_seteuid(daemon_uid);
174 /* Read the fixed length message. */
175 if ((nr = read(devfd, &msg, sizeof(msg))) == sizeof(msg)) {
179 if (msg.lm_version != LOCKD_MSG_VERSION) {
181 "unknown msg type: %d", msg.lm_version);
184 * Send it to the NLM server and don't grant the lock
185 * if we fail for any reason.
187 switch (msg.lm_fl.l_type) {
191 ret = test_request(&msg);
193 ret = lock_request(&msg);
196 ret = unlock_request(&msg);
201 "unknown lock type: %d", msg.lm_fl.l_type);
205 struct lockd_ans ans;
207 ans.la_msg_ident = msg.lm_msg_ident;
208 ans.la_errno = EHOSTUNREACH;
210 if (nfslockdans(LOCKD_ANS_VERSION, &ans)) {
211 syslog((errno == EPIPE ? LOG_INFO :
212 LOG_ERR), "process %lu: %m",
213 (u_long)msg.lm_msg_ident.pid);
216 } else if (nr == -1) {
217 if (errno != EAGAIN) {
218 syslog(LOG_ERR, "read: %s: %m", _PATH_NFSLCKDEV);
221 } else if (nr != 0) {
223 "%s: discard %d bytes", _PATH_NFSLCKDEV, nr);
227 /* Reached only on error. */
229 (void)lockd_seteuid(0);
236 struct xucred *xucred;
240 ngroups = xucred->cr_ngroups - 1;
243 if (cl->cl_auth != NULL)
244 cl->cl_auth->ah_ops->ah_destroy(cl->cl_auth);
245 cl->cl_auth = authunix_create(hostname,
247 xucred->cr_groups[0],
249 &xucred->cr_groups[1]);
255 * Convert a lock LOCKD_MSG into an NLM request, and send it off.
258 test_request(LOCKD_MSG *msg)
261 struct timeval timeout = {0, 0}; /* No timeout, no response. */
265 syslog(LOG_DEBUG, "test request: %s: %s to %s",
266 msg->lm_nfsv3 ? "V4" : "V1/3",
267 msg->lm_fl.l_type == F_WRLCK ? "write" : "read",
268 from_addr((struct sockaddr *)&msg->lm_addr));
271 struct nlm4_testargs arg4;
273 arg4.cookie.n_bytes = (char *)&msg->lm_msg_ident;
274 arg4.cookie.n_len = sizeof(msg->lm_msg_ident);
275 arg4.exclusive = msg->lm_fl.l_type == F_WRLCK ? 1 : 0;
276 arg4.alock.caller_name = hostname;
277 arg4.alock.fh.n_bytes = (char *)&msg->lm_fh;
278 arg4.alock.fh.n_len = msg->lm_fh_len;
279 arg4.alock.oh.n_bytes = (char *)&owner;
280 arg4.alock.oh.n_len = sizeof(owner);
281 arg4.alock.svid = msg->lm_msg_ident.pid;
282 arg4.alock.l_offset = msg->lm_fl.l_start;
283 arg4.alock.l_len = msg->lm_fl.l_len;
285 if ((cli = get_client(
286 (struct sockaddr *)&msg->lm_addr,
290 set_auth(cli, &msg->lm_cred);
291 (void)clnt_call(cli, NLM_TEST_MSG,
292 (xdrproc_t)xdr_nlm4_testargs, &arg4,
293 (xdrproc_t)xdr_void, &dummy, timeout);
295 struct nlm_testargs arg;
297 arg.cookie.n_bytes = (char *)&msg->lm_msg_ident;
298 arg.cookie.n_len = sizeof(msg->lm_msg_ident);
299 arg.exclusive = msg->lm_fl.l_type == F_WRLCK ? 1 : 0;
300 arg.alock.caller_name = hostname;
301 arg.alock.fh.n_bytes = (char *)&msg->lm_fh;
302 arg.alock.fh.n_len = msg->lm_fh_len;
303 arg.alock.oh.n_bytes = (char *)&owner;
304 arg.alock.oh.n_len = sizeof(owner);
305 arg.alock.svid = msg->lm_msg_ident.pid;
306 arg.alock.l_offset = msg->lm_fl.l_start;
307 arg.alock.l_len = msg->lm_fl.l_len;
309 if ((cli = get_client(
310 (struct sockaddr *)&msg->lm_addr,
314 set_auth(cli, &msg->lm_cred);
315 (void)clnt_call(cli, NLM_TEST_MSG,
316 (xdrproc_t)xdr_nlm_testargs, &arg,
317 (xdrproc_t)xdr_void, &dummy, timeout);
324 * Convert a lock LOCKD_MSG into an NLM request, and send it off.
327 lock_request(LOCKD_MSG *msg)
330 struct nlm4_lockargs arg4;
331 struct nlm_lockargs arg;
332 struct timeval timeout = {0, 0}; /* No timeout, no response. */
336 syslog(LOG_DEBUG, "lock request: %s: %s to %s",
337 msg->lm_nfsv3 ? "V4" : "V1/3",
338 msg->lm_fl.l_type == F_WRLCK ? "write" : "read",
339 from_addr((struct sockaddr *)&msg->lm_addr));
342 arg4.cookie.n_bytes = (char *)&msg->lm_msg_ident;
343 arg4.cookie.n_len = sizeof(msg->lm_msg_ident);
344 arg4.block = msg->lm_wait ? 1 : 0;
345 arg4.exclusive = msg->lm_fl.l_type == F_WRLCK ? 1 : 0;
346 arg4.alock.caller_name = hostname;
347 arg4.alock.fh.n_bytes = (char *)&msg->lm_fh;
348 arg4.alock.fh.n_len = msg->lm_fh_len;
349 arg4.alock.oh.n_bytes = (char *)&owner;
350 arg4.alock.oh.n_len = sizeof(owner);
351 arg4.alock.svid = msg->lm_msg_ident.pid;
352 arg4.alock.l_offset = msg->lm_fl.l_start;
353 arg4.alock.l_len = msg->lm_fl.l_len;
355 arg4.state = nsm_state;
357 if ((cli = get_client(
358 (struct sockaddr *)&msg->lm_addr,
362 set_auth(cli, &msg->lm_cred);
363 (void)clnt_call(cli, NLM_LOCK_MSG,
364 (xdrproc_t)xdr_nlm4_lockargs, &arg4,
365 (xdrproc_t)xdr_void, &dummy, timeout);
367 arg.cookie.n_bytes = (char *)&msg->lm_msg_ident;
368 arg.cookie.n_len = sizeof(msg->lm_msg_ident);
369 arg.block = msg->lm_wait ? 1 : 0;
370 arg.exclusive = msg->lm_fl.l_type == F_WRLCK ? 1 : 0;
371 arg.alock.caller_name = hostname;
372 arg.alock.fh.n_bytes = (char *)&msg->lm_fh;
373 arg.alock.fh.n_len = msg->lm_fh_len;
374 arg.alock.oh.n_bytes = (char *)&owner;
375 arg.alock.oh.n_len = sizeof(owner);
376 arg.alock.svid = msg->lm_msg_ident.pid;
377 arg.alock.l_offset = msg->lm_fl.l_start;
378 arg.alock.l_len = msg->lm_fl.l_len;
380 arg.state = nsm_state;
382 if ((cli = get_client(
383 (struct sockaddr *)&msg->lm_addr,
387 set_auth(cli, &msg->lm_cred);
388 (void)clnt_call(cli, NLM_LOCK_MSG,
389 (xdrproc_t)xdr_nlm_lockargs, &arg,
390 (xdrproc_t)xdr_void, &dummy, timeout);
397 * Convert an unlock LOCKD_MSG into an NLM request, and send it off.
400 unlock_request(LOCKD_MSG *msg)
403 struct nlm4_unlockargs arg4;
404 struct nlm_unlockargs arg;
405 struct timeval timeout = {0, 0}; /* No timeout, no response. */
409 syslog(LOG_DEBUG, "unlock request: %s: to %s",
410 msg->lm_nfsv3 ? "V4" : "V1/3",
411 from_addr((struct sockaddr *)&msg->lm_addr));
414 arg4.cookie.n_bytes = (char *)&msg->lm_msg_ident;
415 arg4.cookie.n_len = sizeof(msg->lm_msg_ident);
416 arg4.alock.caller_name = hostname;
417 arg4.alock.fh.n_bytes = (char *)&msg->lm_fh;
418 arg4.alock.fh.n_len = msg->lm_fh_len;
419 arg4.alock.oh.n_bytes = (char *)&owner;
420 arg4.alock.oh.n_len = sizeof(owner);
421 arg4.alock.svid = msg->lm_msg_ident.pid;
422 arg4.alock.l_offset = msg->lm_fl.l_start;
423 arg4.alock.l_len = msg->lm_fl.l_len;
425 if ((cli = get_client(
426 (struct sockaddr *)&msg->lm_addr,
430 set_auth(cli, &msg->lm_cred);
431 (void)clnt_call(cli, NLM_UNLOCK_MSG,
432 (xdrproc_t)xdr_nlm4_unlockargs, &arg4,
433 (xdrproc_t)xdr_void, &dummy, timeout);
435 arg.cookie.n_bytes = (char *)&msg->lm_msg_ident;
436 arg.cookie.n_len = sizeof(msg->lm_msg_ident);
437 arg.alock.caller_name = hostname;
438 arg.alock.fh.n_bytes = (char *)&msg->lm_fh;
439 arg.alock.fh.n_len = msg->lm_fh_len;
440 arg.alock.oh.n_bytes = (char *)&owner;
441 arg.alock.oh.n_len = sizeof(owner);
442 arg.alock.svid = msg->lm_msg_ident.pid;
443 arg.alock.l_offset = msg->lm_fl.l_start;
444 arg.alock.l_len = msg->lm_fl.l_len;
446 if ((cli = get_client(
447 (struct sockaddr *)&msg->lm_addr,
451 set_auth(cli, &msg->lm_cred);
452 (void)clnt_call(cli, NLM_UNLOCK_MSG,
453 (xdrproc_t)xdr_nlm_unlockargs, &arg,
454 (xdrproc_t)xdr_void, &dummy, timeout);
461 lock_answer(int pid, netobj *netcookie, int result, int *pid_p, int version)
463 struct lockd_ans ans;
465 if (netcookie->n_len != sizeof(ans.la_msg_ident)) {
466 if (pid == -1) { /* we're screwed */
467 syslog(LOG_ERR, "inedible nlm cookie");
470 ans.la_msg_ident.pid = pid;
471 ans.la_msg_ident.msg_seq = -1;
473 memcpy(&ans.la_msg_ident, netcookie->n_bytes,
474 sizeof(ans.la_msg_ident));
478 syslog(LOG_DEBUG, "lock answer: pid %lu: %s %d",
479 (unsigned long)ans.la_msg_ident.pid,
480 version == NLM_VERS4 ? "nlmv4" : "nlmv3",
483 ans.la_set_getlk_pid = 0;
484 if (version == NLM_VERS4)
490 ans.la_errno = EACCES;
494 ans.la_errno = EAGAIN;
496 /* this is an answer to a nlm_test msg */
497 ans.la_set_getlk_pid = 1;
498 ans.la_getlk_pid = *pid_p;
502 case nlm4_denied_nolocks:
503 ans.la_errno = EAGAIN;
508 case nlm4_denied_grace_period:
509 ans.la_errno = EAGAIN;
512 ans.la_errno = EDEADLK;
515 ans.la_errno = EROFS;
518 ans.la_errno = ESTALE;
521 ans.la_errno = EFBIG;
524 ans.la_errno = EACCES;
533 ans.la_errno = EACCES;
537 ans.la_errno = EAGAIN;
539 /* this is an answer to a nlm_test msg */
540 ans.la_set_getlk_pid = 1;
541 ans.la_getlk_pid = *pid_p;
545 case nlm_denied_nolocks:
546 ans.la_errno = EAGAIN;
551 case nlm_denied_grace_period:
552 ans.la_errno = EAGAIN;
555 ans.la_errno = EDEADLK;
559 if (nfslockdans(LOCKD_ANS_VERSION, &ans)) {
560 syslog(((errno == EPIPE || errno == ESRCH) ?
562 "process %lu: %m", (u_long)ans.la_msg_ident.pid);
570 * Display the contents of a kernel LOCKD_MSG structure.
575 static char hex[] = "0123456789abcdef";
579 u_int8_t *p, *t, buf[NFS_SMALLFH*3+1];
581 syslog(LOG_DEBUG, "process ID: %lu\n", (long)mp->lm_msg_ident.pid);
583 fsidp = (fsid_t *)&mp->lm_fh;
584 fidp = (struct fid *)((u_int8_t *)&mp->lm_fh + sizeof(fsid_t));
586 for (t = buf, p = (u_int8_t *)mp->lm_fh,
588 len > 0; ++p, --len) {
590 *t++ = hex[(*p & 0xf0) >> 4];
591 *t++ = hex[*p & 0x0f];
595 syslog(LOG_DEBUG, "fh_len %d, fh %s\n", (int)mp->lm_fh_len, buf);
597 /* Show flock structure. */
598 syslog(LOG_DEBUG, "start %llu; len %llu; pid %lu; type %d; whence %d\n",
599 (unsigned long long)mp->lm_fl.l_start,
600 (unsigned long long)mp->lm_fl.l_len, (u_long)mp->lm_fl.l_pid,
601 mp->lm_fl.l_type, mp->lm_fl.l_whence);
603 /* Show wait flag. */
604 syslog(LOG_DEBUG, "wait was %s\n", mp->lm_wait ? "set" : "not set");