2 * utils/mountd/mountd.c
4 * Authenticate mount requests and retrieve file handle.
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
15 #include <netinet/in.h>
16 #include <arpa/inet.h>
23 #include <sys/resource.h>
30 extern void cache_open(void);
31 extern struct nfs_fh_len *cache_get_filehandle(nfs_export *exp, int len, char *p);
32 extern int cache_export(nfs_export *exp, char *path);
34 extern void my_svc_run(void);
36 static void usage(const char *, int exitcode);
37 static exports get_exportlist(void);
38 static struct nfs_fh_len *get_rootfh(struct svc_req *, dirpath *, mountstat3 *, int v3);
40 int reverse_resolve = 0;
45 /* PRC: a high-availability callout program can be specified with -H
46 * When this is done, the program will receive callouts whenever clients
47 * send mount or unmount requests -- the callout is not needed for 2.6 kernel */
48 char *ha_callout_prog = NULL;
50 /* Number of mountd threads to start. Default is 1 and
51 * that's probably enough unless you need hundreds of
52 * clients to be able to mount at once. */
53 static int num_threads = 1;
54 /* Arbitrary limit on number of threads */
55 #define MAX_THREADS 64
57 static struct option longopts[] =
59 { "foreground", 0, 0, 'F' },
60 { "descriptors", 1, 0, 'o' },
61 { "debug", 1, 0, 'd' },
62 { "help", 0, 0, 'h' },
63 { "exports-file", 1, 0, 'f' },
64 { "nfs-version", 1, 0, 'V' },
65 { "no-nfs-version", 1, 0, 'N' },
66 { "version", 0, 0, 'v' },
67 { "port", 1, 0, 'p' },
68 { "no-tcp", 0, 0, 'n' },
69 { "ha-callout", 1, 0, 'H' },
70 { "state-directory-path", 1, 0, 's' },
71 { "num-threads", 1, 0, 't' },
72 { "reverse-lookup", 0, 0, 'r' },
73 { "manage-gids", 0, 0, 'g' },
77 static int nfs_version = -1;
80 unregister_services (void)
82 if (nfs_version & 0x1)
83 pmap_unset (MOUNTPROG, MOUNTVERS);
84 if (nfs_version & (0x1 << 1))
85 pmap_unset (MOUNTPROG, MOUNTVERS_POSIX);
86 if (nfs_version & (0x1 << 2))
87 pmap_unset (MOUNTPROG, MOUNTVERS_NFSV3);
90 /* Wait for all worker child processes to exit and reap them */
92 wait_for_workers (void)
99 pid = waitpid(0, &status, 0);
103 return; /* no more children */
104 xlog(L_FATAL, "mountd: can't wait: %s\n",
108 /* Note: because we SIG_IGN'd SIGCHLD earlier, this
109 * does not happen on 2.6 kernels, and waitpid() blocks
110 * until all the children are dead then returns with
111 * -ECHILD. But, we don't need to do anything on the
112 * death of individual workers, so we don't care. */
113 xlog(L_NOTICE, "mountd: reaped child %d, status %d\n",
118 /* Fork num_threads worker children and wait for them */
125 xlog(L_NOTICE, "mountd: starting %d threads\n", num_threads);
127 for (i = 0 ; i < num_threads ; i++) {
130 xlog(L_FATAL, "mountd: cannot fork: %s\n",
136 /* Re-enable the default action on SIGTERM et al
137 * so that workers die naturally when sent them.
138 * Only the parent unregisters with pmap and
139 * hence needs to do special SIGTERM handling. */
141 sa.sa_handler = SIG_DFL;
143 sigemptyset(&sa.sa_mask);
144 sigaction(SIGHUP, &sa, NULL);
145 sigaction(SIGINT, &sa, NULL);
146 sigaction(SIGTERM, &sa, NULL);
148 /* fall into my_svc_run in caller */
155 unregister_services();
156 xlog(L_NOTICE, "mountd: no more workers, exiting\n");
166 unregister_services();
167 if (num_threads > 1) {
168 /* play Kronos and eat our children */
172 xlog (L_FATAL, "Caught signal %d, un-registering and exiting.", sig);
178 /* don't exit on SIGHUP */
179 xlog (L_NOTICE, "Received SIGHUP... Ignoring.\n", sig);
184 mount_null_1_svc(struct svc_req *rqstp, void *argp, void *resp)
190 mount_mnt_1_svc(struct svc_req *rqstp, dirpath *path, fhstatus *res)
192 struct nfs_fh_len *fh;
194 xlog(D_CALL, "MNT1(%s) called", *path);
195 if ((fh = get_rootfh(rqstp, path, &res->fhs_status, 0)) != NULL)
196 memcpy(&res->fhstatus_u.fhs_fhandle, fh->fh_handle, 32);
201 mount_dump_1_svc(struct svc_req *rqstp, void *argp, mountlist *res)
203 struct sockaddr_in *addr =
204 (struct sockaddr_in *) svc_getcaller(rqstp->rq_xprt);
206 xlog(D_CALL, "dump request from %s.", inet_ntoa(addr->sin_addr));
207 *res = mountlist_list();
213 mount_umnt_1_svc(struct svc_req *rqstp, dirpath *argp, void *resp)
215 struct sockaddr_in *sin
216 = (struct sockaddr_in *) svc_getcaller(rqstp->rq_xprt);
219 char rpath[MAXPATHLEN+1];
224 if (realpath(p, rpath) != NULL) {
225 rpath[sizeof (rpath) - 1] = '\0';
229 if (!(exp = auth_authenticate("unmount", sin, p))) {
236 mountlist_del(inet_ntoa(sin->sin_addr), p);
241 mount_umntall_1_svc(struct svc_req *rqstp, void *argp, void *resp)
243 /* Reload /etc/xtab if necessary */
246 mountlist_del_all((struct sockaddr_in *) svc_getcaller(rqstp->rq_xprt));
251 mount_export_1_svc(struct svc_req *rqstp, void *argp, exports *resp)
253 struct sockaddr_in *addr =
254 (struct sockaddr_in *) svc_getcaller(rqstp->rq_xprt);
256 xlog(D_CALL, "export request from %s.", inet_ntoa(addr->sin_addr));
257 *resp = get_exportlist();
263 mount_exportall_1_svc(struct svc_req *rqstp, void *argp, exports *resp)
265 struct sockaddr_in *addr =
266 (struct sockaddr_in *) svc_getcaller(rqstp->rq_xprt);
268 xlog(D_CALL, "exportall request from %s.", inet_ntoa(addr->sin_addr));
269 *resp = get_exportlist();
275 * MNTv2 pathconf procedure
277 * The protocol doesn't include a status field, so Sun apparently considers
278 * it good practice to let anyone snoop on your system, even if it's
279 * pretty harmless data such as pathconf. We don't.
281 * Besides, many of the pathconf values don't make much sense on NFS volumes.
282 * FIFOs and tty device files represent devices on the *client*, so there's
283 * no point in getting the server's buffer sizes etc.
286 mount_pathconf_2_svc(struct svc_req *rqstp, dirpath *path, ppathcnf *res)
288 struct sockaddr_in *sin
289 = (struct sockaddr_in *) svc_getcaller(rqstp->rq_xprt);
292 char rpath[MAXPATHLEN+1];
295 memset(res, 0, sizeof(*res));
300 /* Reload /etc/xtab if necessary */
303 /* Resolve symlinks */
304 if (realpath(p, rpath) != NULL) {
305 rpath[sizeof (rpath) - 1] = '\0';
309 /* Now authenticate the intruder... */
310 if (!(exp = auth_authenticate("pathconf", sin, p))) {
312 } else if (stat(p, &stb) < 0) {
313 xlog(L_WARNING, "can't stat exported dir %s: %s",
319 res->pc_link_max = pathconf(p, _PC_LINK_MAX);
320 res->pc_max_canon = pathconf(p, _PC_MAX_CANON);
321 res->pc_max_input = pathconf(p, _PC_MAX_INPUT);
322 res->pc_name_max = pathconf(p, _PC_NAME_MAX);
323 res->pc_path_max = pathconf(p, _PC_PATH_MAX);
324 res->pc_pipe_buf = pathconf(p, _PC_PIPE_BUF);
325 res->pc_vdisable = pathconf(p, _PC_VDISABLE);
327 /* Can't figure out what to do with pc_mask */
337 * NFSv3 MOUNT procedure
340 mount_mnt_3_svc(struct svc_req *rqstp, dirpath *path, mountres3 *res)
342 #define AUTH_GSS_KRB5 390003
343 #define AUTH_GSS_KRB5I 390004
344 #define AUTH_GSS_KRB5P 390005
345 static int flavors[] = { AUTH_UNIX, AUTH_GSS_KRB5, AUTH_GSS_KRB5I, AUTH_GSS_KRB5P};
347 * We should advertise the preferred flavours first. (See RFC 2623
348 * section 2.7.) AUTH_UNIX is arbitrarily ranked over the GSS's.
349 * AUTH_NULL is dropped from the list to avoid backward compatibility
350 * issue with older Linux clients, who inspect the list in reversed
353 struct nfs_fh_len *fh;
355 xlog(D_CALL, "MNT3(%s) called", *path);
356 if ((fh = get_rootfh(rqstp, path, &res->fhs_status, 1)) != NULL) {
357 struct mountres3_ok *ok = &res->mountres3_u.mountinfo;
359 ok->fhandle.fhandle3_len = fh->fh_size;
360 ok->fhandle.fhandle3_val = (char *)fh->fh_handle;
361 ok->auth_flavors.auth_flavors_len
362 = sizeof(flavors)/sizeof(flavors[0]);
363 ok->auth_flavors.auth_flavors_val = flavors;
368 static struct nfs_fh_len *
369 get_rootfh(struct svc_req *rqstp, dirpath *path, mountstat3 *error, int v3)
371 struct sockaddr_in *sin =
372 (struct sockaddr_in *) svc_getcaller(rqstp->rq_xprt);
373 struct stat stb, estb;
375 char rpath[MAXPATHLEN+1];
381 /* Reload /var/lib/nfs/etab if necessary */
384 /* Resolve symlinks */
385 if (realpath(p, rpath) != NULL) {
386 rpath[sizeof (rpath) - 1] = '\0';
390 /* Now authenticate the intruder... */
391 if (!(exp = auth_authenticate("mount", sin, p))) {
392 *error = NFSERR_ACCES;
393 } else if (stat(p, &stb) < 0) {
394 xlog(L_WARNING, "can't stat exported dir %s: %s",
397 *error = NFSERR_NOENT;
399 *error = NFSERR_ACCES;
400 } else if (!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode)) {
401 xlog(L_WARNING, "%s is not a directory or regular file", p);
402 *error = NFSERR_NOTDIR;
403 } else if (stat(exp->m_export.e_path, &estb) < 0) {
404 xlog(L_WARNING, "can't stat export point %s: %s",
406 *error = NFSERR_NOENT;
407 } else if (estb.st_dev != stb.st_dev
408 && (!new_cache || !(exp->m_export.e_flags & NFSEXP_CROSSMOUNT))
410 xlog(L_WARNING, "request to export directory %s below nearest filesystem %s",
411 p, exp->m_export.e_path);
412 *error = NFSERR_ACCES;
413 } else if (exp->m_export.e_mountpoint &&
414 !is_mountpoint(exp->m_export.e_mountpoint[0]?
415 exp->m_export.e_mountpoint:
416 exp->m_export.e_path)) {
417 xlog(L_WARNING, "request to export an unmounted filesystem: %s",
419 *error = NFSERR_NOENT;
420 } else if (new_cache) {
421 /* This will be a static private nfs_export with just one
422 * address. We feed it to kernel then extract the filehandle,
425 struct nfs_fh_len *fh;
427 if (cache_export(exp, p)) {
428 *error = NFSERR_ACCES;
431 fh = cache_get_filehandle(exp, v3?64:32, p);
433 *error = NFSERR_ACCES;
436 mountlist_add(inet_ntoa(sin->sin_addr), p);
440 struct nfs_fh_len *fh;
442 if (exp->m_exported<1)
448 fh = getfh_size ((struct sockaddr *) sin, p, 64);
449 if (!v3 || (fh == NULL && errno == EINVAL)) {
450 /* We first try the new nfs syscall. */
451 fh = getfh ((struct sockaddr *) sin, p);
452 if (fh == NULL && errno == EINVAL)
453 /* Let's try the old one. */
454 fh = getfh_old ((struct sockaddr *) sin,
455 stb.st_dev, stb.st_ino);
458 mountlist_add(inet_ntoa(sin->sin_addr), p);
463 xlog(L_WARNING, "getfh failed: %s", strerror(errno));
464 *error = NFSERR_ACCES;
473 static exports elist = NULL;
474 struct exportnode *e, *ne;
475 struct groupnode *g, *ng, *c, **cp;
478 static unsigned int ecounter;
479 unsigned int acounter;
481 acounter = auth_reload();
482 if (elist && acounter == ecounter)
487 for (e = elist; e != NULL; e = ne) {
489 for (g = e->ex_groups; g != NULL; g = ng) {
499 for (i = 0; i < MCL_MAXTYPES; i++) {
500 for (exp = exportlist[i]; exp; exp = exp->m_next) {
501 for (e = elist; e != NULL; e = e->ex_next) {
502 if (!strcmp(exp->m_export.m_path, e->ex_dir))
506 e = (struct exportnode *) xmalloc(sizeof(*e));
509 e->ex_dir = xstrdup(exp->m_export.m_path);
513 /* We need to check if we should remove
515 if (i == MCL_ANONYMOUS && e->ex_groups) {
516 for (g = e->ex_groups; g; g = ng) {
525 if (i != MCL_FQDN && e->ex_groups) {
529 while ((c = *cp) != NULL) {
530 if (client_gettype (c->gr_name) == MCL_FQDN
531 && (hp = gethostbyname(c->gr_name))) {
532 hp = hostent_dup (hp);
533 if (client_check(exp->m_client, hp)) {
546 if (exp->m_export.e_hostname [0] != '\0') {
547 for (g = e->ex_groups; g; g = g->gr_next)
548 if (strcmp (exp->m_export.e_hostname,
553 g = (struct groupnode *) xmalloc(sizeof(*g));
554 g->gr_name = xstrdup(exp->m_export.e_hostname);
555 g->gr_next = e->ex_groups;
565 main(int argc, char **argv)
567 char *export_file = _PATH_EXPORTS;
568 char *state_dir = NFS_STATEDIR;
576 /* Parse the command line options and arguments. */
578 while ((c = getopt_long(argc, argv, "o:nFd:f:p:P:hH:N:V:vrs:t:g", longopts, NULL)) != EOF)
584 descriptors = atoi(optarg);
585 if (descriptors <= 0) {
586 fprintf(stderr, "%s: bad descriptors: %s\n",
595 xlog_sconfig(optarg, 1);
598 export_file = optarg;
600 case 'H': /* PRC: specify a high-availability callout program */
601 ha_callout_prog = optarg;
606 case 'P': /* XXX for nfs-server compatibility */
609 if (port <= 0 || port > 65535) {
610 fprintf(stderr, "%s: bad port number: %s\n",
616 nfs_version &= ~(1 << (atoi (optarg) - 1));
619 _rpcfdtype = SOCK_DGRAM;
625 if ((state_dir = xstrdup(optarg)) == NULL) {
626 fprintf(stderr, "%s: xstrdup(%s) failed!\n",
632 num_threads = atoi (optarg);
635 nfs_version |= 1 << (atoi (optarg) - 1);
638 printf("kmountd %s\n", VERSION);
647 /* No more arguments allowed. */
648 if (optind != argc || !(nfs_version & 0x7))
651 if (chdir(state_dir)) {
652 fprintf(stderr, "%s: chdir(%s) failed: %s\n",
653 argv [0], state_dir, strerror(errno));
657 if (getrlimit (RLIMIT_NOFILE, &rlim) != 0)
658 fprintf(stderr, "%s: getrlimit (RLIMIT_NOFILE) failed: %s\n",
659 argv [0], strerror(errno));
661 /* glibc sunrpc code dies if getdtablesize > FD_SETSIZE */
662 if ((descriptors == 0 && rlim.rlim_cur > FD_SETSIZE) ||
663 descriptors > FD_SETSIZE)
664 descriptors = FD_SETSIZE;
666 rlim.rlim_cur = descriptors;
667 if (setrlimit (RLIMIT_NOFILE, &rlim) != 0) {
668 fprintf(stderr, "%s: setrlimit (RLIMIT_NOFILE) failed: %s\n",
669 argv [0], strerror(errno));
674 /* Initialize logging. */
675 if (!foreground) xlog_stderr(0);
678 sa.sa_handler = SIG_IGN;
680 sigemptyset(&sa.sa_mask);
681 sigaction(SIGHUP, &sa, NULL);
682 sigaction(SIGINT, &sa, NULL);
683 sigaction(SIGTERM, &sa, NULL);
684 sigaction(SIGPIPE, &sa, NULL);
685 /* WARNING: the following works on Linux and SysV, but not BSD! */
686 sigaction(SIGCHLD, &sa, NULL);
688 /* Daemons should close all extra filehandles ... *before* RPC init. */
692 new_cache = check_new_cache();
696 if (nfs_version & 0x1)
697 rpc_init("mountd", MOUNTPROG, MOUNTVERS,
698 mount_dispatch, port);
699 if (nfs_version & (0x1 << 1))
700 rpc_init("mountd", MOUNTPROG, MOUNTVERS_POSIX,
701 mount_dispatch, port);
702 if (nfs_version & (0x1 << 2))
703 rpc_init("mountd", MOUNTPROG, MOUNTVERS_NFSV3,
704 mount_dispatch, port);
706 sa.sa_handler = killer;
707 sigaction(SIGINT, &sa, NULL);
708 sigaction(SIGTERM, &sa, NULL);
709 sa.sa_handler = sig_hup;
710 sigaction(SIGHUP, &sa, NULL);
712 auth_init(export_file);
715 /* We first fork off a child. */
716 if ((c = fork()) > 0)
719 xlog(L_FATAL, "mountd: cannot fork: %s\n",
722 /* Now we remove ourselves from the foreground.
723 Redirect stdin/stdout/stderr first. */
725 int fd = open("/dev/null", O_RDWR);
729 if (fd > 2) (void) close(fd);
734 /* silently bounds check num_threads */
737 else if (num_threads < 1)
739 else if (num_threads > MAX_THREADS)
740 num_threads = MAX_THREADS;
747 xlog(L_ERROR, "Ack! Gack! svc_run returned!\n");
752 usage(const char *prog, int n)
755 "Usage: %s [-F|--foreground] [-h|--help] [-v|--version] [-d kind|--debug kind]\n"
756 " [-o num|--descriptors num] [-f exports-file|--exports-file=file]\n"
757 " [-p|--port port] [-V version|--nfs-version version]\n"
758 " [-N version|--no-nfs-version version] [-n|--no-tcp]\n"
759 " [-H ha-callout-prog] [-s|--state-directory-path path]\n"
760 " [-g|--manage-gids] [-t num|--num-threads=num]\n", prog);