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);
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;
44 /* PRC: a high-availability callout program can be specified with -H
45 * When this is done, the program will receive callouts whenever clients
46 * send mount or unmount requests -- the callout is not needed for 2.6 kernel */
47 char *ha_callout_prog = NULL;
49 /* Number of mountd threads to start. Default is 1 and
50 * that's probably enough unless you need hundreds of
51 * clients to be able to mount at once. */
52 static int num_threads = 1;
53 /* Arbitrary limit on number of threads */
54 #define MAX_THREADS 64
56 static struct option longopts[] =
58 { "foreground", 0, 0, 'F' },
59 { "descriptors", 1, 0, 'o' },
60 { "debug", 1, 0, 'd' },
61 { "help", 0, 0, 'h' },
62 { "exports-file", 1, 0, 'f' },
63 { "nfs-version", 1, 0, 'V' },
64 { "no-nfs-version", 1, 0, 'N' },
65 { "version", 0, 0, 'v' },
66 { "port", 1, 0, 'p' },
67 { "no-tcp", 0, 0, 'n' },
68 { "ha-callout", 1, 0, 'H' },
69 { "state-directory-path", 1, 0, 's' },
70 { "num-threads", 1, 0, 't' },
71 { "reverse-lookup", 0, 0, 'r' },
72 { "manage-gids", 0, 0, 'g' },
76 static int nfs_version = -1;
79 unregister_services (void)
81 if (nfs_version & 0x1)
82 pmap_unset (MOUNTPROG, MOUNTVERS);
83 if (nfs_version & (0x1 << 1))
84 pmap_unset (MOUNTPROG, MOUNTVERS_POSIX);
85 if (nfs_version & (0x1 << 2))
86 pmap_unset (MOUNTPROG, MOUNTVERS_NFSV3);
89 /* Wait for all worker child processes to exit and reap them */
91 wait_for_workers (void)
98 pid = waitpid(0, &status, 0);
102 return; /* no more children */
103 xlog(L_FATAL, "mountd: can't wait: %s\n",
107 /* Note: because we SIG_IGN'd SIGCHLD earlier, this
108 * does not happen on 2.6 kernels, and waitpid() blocks
109 * until all the children are dead then returns with
110 * -ECHILD. But, we don't need to do anything on the
111 * death of individual workers, so we don't care. */
112 xlog(L_NOTICE, "mountd: reaped child %d, status %d\n",
117 /* Fork num_threads worker children and wait for them */
124 xlog(L_NOTICE, "mountd: starting %d threads\n", num_threads);
126 for (i = 0 ; i < num_threads ; i++) {
129 xlog(L_FATAL, "mountd: cannot fork: %s\n",
135 /* Re-enable the default action on SIGTERM et al
136 * so that workers die naturally when sent them.
137 * Only the parent unregisters with pmap and
138 * hence needs to do special SIGTERM handling. */
140 sa.sa_handler = SIG_DFL;
142 sigemptyset(&sa.sa_mask);
143 sigaction(SIGHUP, &sa, NULL);
144 sigaction(SIGINT, &sa, NULL);
145 sigaction(SIGTERM, &sa, NULL);
147 /* fall into my_svc_run in caller */
154 unregister_services();
155 xlog(L_NOTICE, "mountd: no more workers, exiting\n");
165 unregister_services();
166 if (num_threads > 1) {
167 /* play Kronos and eat our children */
171 xlog (L_FATAL, "Caught signal %d, un-registering and exiting.", sig);
177 /* don't exit on SIGHUP */
178 xlog (L_NOTICE, "Received SIGHUP... Ignoring.\n", sig);
183 mount_null_1_svc(struct svc_req *rqstp, void *argp, void *resp)
189 mount_mnt_1_svc(struct svc_req *rqstp, dirpath *path, fhstatus *res)
191 struct nfs_fh_len *fh;
193 xlog(D_CALL, "MNT1(%s) called", *path);
194 if ((fh = get_rootfh(rqstp, path, &res->fhs_status, 0)) != NULL)
195 memcpy(&res->fhstatus_u.fhs_fhandle, fh->fh_handle, 32);
200 mount_dump_1_svc(struct svc_req *rqstp, void *argp, mountlist *res)
202 struct sockaddr_in *addr =
203 (struct sockaddr_in *) svc_getcaller(rqstp->rq_xprt);
205 if ((*res = mountlist_list()) == NULL)
206 xlog(L_WARNING, "dump request from %s failed.",
207 inet_ntoa(addr->sin_addr));
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 if ((*resp = get_exportlist()) == NULL)
257 xlog(L_WARNING, "export request from %s failed.",
258 inet_ntoa(addr->sin_addr));
264 mount_exportall_1_svc(struct svc_req *rqstp, void *argp, exports *resp)
266 struct sockaddr_in *addr =
267 (struct sockaddr_in *) svc_getcaller(rqstp->rq_xprt);
269 if ((*resp = get_exportlist()) == NULL)
270 xlog(L_WARNING, "exportall request from %s failed.",
271 inet_ntoa(addr->sin_addr));
276 * MNTv2 pathconf procedure
278 * The protocol doesn't include a status field, so Sun apparently considers
279 * it good practice to let anyone snoop on your system, even if it's
280 * pretty harmless data such as pathconf. We don't.
282 * Besides, many of the pathconf values don't make much sense on NFS volumes.
283 * FIFOs and tty device files represent devices on the *client*, so there's
284 * no point in getting the server's buffer sizes etc.
287 mount_pathconf_2_svc(struct svc_req *rqstp, dirpath *path, ppathcnf *res)
289 struct sockaddr_in *sin
290 = (struct sockaddr_in *) svc_getcaller(rqstp->rq_xprt);
293 char rpath[MAXPATHLEN+1];
296 memset(res, 0, sizeof(*res));
301 /* Reload /etc/xtab if necessary */
304 /* Resolve symlinks */
305 if (realpath(p, rpath) != NULL) {
306 rpath[sizeof (rpath) - 1] = '\0';
310 /* Now authenticate the intruder... */
311 if (!(exp = auth_authenticate("pathconf", sin, p))) {
313 } else if (stat(p, &stb) < 0) {
314 xlog(L_WARNING, "can't stat exported dir %s: %s",
320 res->pc_link_max = pathconf(p, _PC_LINK_MAX);
321 res->pc_max_canon = pathconf(p, _PC_MAX_CANON);
322 res->pc_max_input = pathconf(p, _PC_MAX_INPUT);
323 res->pc_name_max = pathconf(p, _PC_NAME_MAX);
324 res->pc_path_max = pathconf(p, _PC_PATH_MAX);
325 res->pc_pipe_buf = pathconf(p, _PC_PIPE_BUF);
326 res->pc_vdisable = pathconf(p, _PC_VDISABLE);
328 /* Can't figure out what to do with pc_mask */
338 * NFSv3 MOUNT procedure
341 mount_mnt_3_svc(struct svc_req *rqstp, dirpath *path, mountres3 *res)
343 #define AUTH_GSS_KRB5 390003
344 #define AUTH_GSS_KRB5I 390004
345 #define AUTH_GSS_KRB5P 390005
346 static int flavors[] = { AUTH_NULL, AUTH_UNIX, AUTH_GSS_KRB5, AUTH_GSS_KRB5I, AUTH_GSS_KRB5P};
347 struct nfs_fh_len *fh;
349 xlog(D_CALL, "MNT3(%s) called", *path);
350 if ((fh = get_rootfh(rqstp, path, &res->fhs_status, 1)) != NULL) {
351 struct mountres3_ok *ok = &res->mountres3_u.mountinfo;
353 ok->fhandle.fhandle3_len = fh->fh_size;
354 ok->fhandle.fhandle3_val = (char *)fh->fh_handle;
355 ok->auth_flavors.auth_flavors_len
356 = sizeof(flavors)/sizeof(flavors[0]);
357 ok->auth_flavors.auth_flavors_val = flavors;
362 static struct nfs_fh_len *
363 get_rootfh(struct svc_req *rqstp, dirpath *path, mountstat3 *error, int v3)
365 struct sockaddr_in *sin =
366 (struct sockaddr_in *) svc_getcaller(rqstp->rq_xprt);
367 struct stat stb, estb;
369 char rpath[MAXPATHLEN+1];
375 /* Reload /var/lib/nfs/etab if necessary */
378 /* Resolve symlinks */
379 if (realpath(p, rpath) != NULL) {
380 rpath[sizeof (rpath) - 1] = '\0';
384 /* Now authenticate the intruder... */
385 if (!(exp = auth_authenticate("mount", sin, p))) {
386 *error = NFSERR_ACCES;
387 } else if (stat(p, &stb) < 0) {
388 xlog(L_WARNING, "can't stat exported dir %s: %s",
391 *error = NFSERR_NOENT;
393 *error = NFSERR_ACCES;
394 } else if (!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode)) {
395 xlog(L_WARNING, "%s is not a directory or regular file", p);
396 *error = NFSERR_NOTDIR;
397 } else if (stat(exp->m_export.e_path, &estb) < 0) {
398 xlog(L_WARNING, "can't stat export point %s: %s",
400 *error = NFSERR_NOENT;
401 } else if (estb.st_dev != stb.st_dev
402 /* && (!new_cache || !(exp->m_export.e_flags & NFSEXP_CROSSMOUNT)) */
404 xlog(L_WARNING, "request to export directory %s below nearest filesystem %s",
405 p, exp->m_export.e_path);
406 *error = NFSERR_ACCES;
407 } else if (exp->m_export.e_mountpoint &&
408 !is_mountpoint(exp->m_export.e_mountpoint[0]?
409 exp->m_export.e_mountpoint:
410 exp->m_export.e_path)) {
411 xlog(L_WARNING, "request to export an unmounted filesystem: %s",
413 *error = NFSERR_NOENT;
414 } else if (new_cache) {
415 /* This will be a static private nfs_export with just one
416 * address. We feed it to kernel then extract the filehandle,
419 struct nfs_fh_len *fh;
421 if (cache_export(exp)) {
422 *error = NFSERR_ACCES;
425 fh = cache_get_filehandle(exp, v3?64:32, p);
427 *error = NFSERR_ACCES;
430 mountlist_add(inet_ntoa(sin->sin_addr), p);
434 struct nfs_fh_len *fh;
436 if (exp->m_exported<1)
442 fh = getfh_size ((struct sockaddr *) sin, p, 64);
443 if (!v3 || (fh == NULL && errno == EINVAL)) {
444 /* We first try the new nfs syscall. */
445 fh = getfh ((struct sockaddr *) sin, p);
446 if (fh == NULL && errno == EINVAL)
447 /* Let's try the old one. */
448 fh = getfh_old ((struct sockaddr *) sin,
449 stb.st_dev, stb.st_ino);
452 mountlist_add(inet_ntoa(sin->sin_addr), p);
457 xlog(L_WARNING, "getfh failed: %s", strerror(errno));
458 *error = NFSERR_ACCES;
467 static exports elist = NULL;
468 static time_t etime = 0;
470 struct exportnode *e, *ne;
471 struct groupnode *g, *ng, *c, **cp;
475 atime = auth_reload();
476 if (elist && atime == etime)
481 for (e = elist; e != NULL; e = ne) {
483 for (g = e->ex_groups; g != NULL; g = ng) {
493 for (i = 0; i < MCL_MAXTYPES; i++) {
494 for (exp = exportlist[i]; exp; exp = exp->m_next) {
495 for (e = elist; e != NULL; e = e->ex_next) {
496 if (!strcmp(exp->m_export.m_path, e->ex_dir))
500 e = (struct exportnode *) xmalloc(sizeof(*e));
503 e->ex_dir = xstrdup(exp->m_export.m_path);
507 /* We need to check if we should remove
509 if (i == MCL_ANONYMOUS && e->ex_groups) {
510 for (g = e->ex_groups; g; g = ng) {
519 if (i != MCL_FQDN && e->ex_groups) {
523 while ((c = *cp) != NULL) {
524 if (client_gettype (c->gr_name) == MCL_FQDN
525 && (hp = gethostbyname(c->gr_name))) {
526 hp = hostent_dup (hp);
527 if (client_check(exp->m_client, hp)) {
540 if (exp->m_export.e_hostname [0] != '\0') {
541 for (g = e->ex_groups; g; g = g->gr_next)
542 if (strcmp (exp->m_export.e_hostname,
547 g = (struct groupnode *) xmalloc(sizeof(*g));
548 g->gr_name = xstrdup(exp->m_export.e_hostname);
549 g->gr_next = e->ex_groups;
559 main(int argc, char **argv)
561 char *export_file = _PATH_EXPORTS;
562 char *state_dir = NFS_STATEDIR;
570 /* Parse the command line options and arguments. */
572 while ((c = getopt_long(argc, argv, "o:nFd:f:p:P:hH:N:V:vrs:t:g", longopts, NULL)) != EOF)
578 descriptors = atoi(optarg);
579 if (descriptors <= 0) {
580 fprintf(stderr, "%s: bad descriptors: %s\n",
589 xlog_sconfig(optarg, 1);
592 export_file = optarg;
594 case 'H': /* PRC: specify a high-availability callout program */
595 ha_callout_prog = optarg;
600 case 'P': /* XXX for nfs-server compatibility */
603 if (port <= 0 || port > 65535) {
604 fprintf(stderr, "%s: bad port number: %s\n",
610 nfs_version &= ~(1 << (atoi (optarg) - 1));
613 _rpcfdtype = SOCK_DGRAM;
619 if ((state_dir = xstrdup(optarg)) == NULL) {
620 fprintf(stderr, "%s: xstrdup(%s) failed!\n",
626 num_threads = atoi (optarg);
629 nfs_version |= 1 << (atoi (optarg) - 1);
632 printf("kmountd %s\n", VERSION);
641 /* No more arguments allowed. */
642 if (optind != argc || !(nfs_version & 0x7))
645 if (chdir(state_dir)) {
646 fprintf(stderr, "%s: chdir(%s) failed: %s\n",
647 argv [0], state_dir, strerror(errno));
651 if (getrlimit (RLIMIT_NOFILE, &rlim) != 0)
652 fprintf(stderr, "%s: getrlimit (RLIMIT_NOFILE) failed: %s\n",
653 argv [0], strerror(errno));
655 /* glibc sunrpc code dies if getdtablesize > FD_SETSIZE */
656 if ((descriptors == 0 && rlim.rlim_cur > FD_SETSIZE) ||
657 descriptors > FD_SETSIZE)
658 descriptors = FD_SETSIZE;
660 rlim.rlim_cur = descriptors;
661 if (setrlimit (RLIMIT_NOFILE, &rlim) != 0) {
662 fprintf(stderr, "%s: setrlimit (RLIMIT_NOFILE) failed: %s\n",
663 argv [0], strerror(errno));
668 /* Initialize logging. */
669 if (!foreground) xlog_stderr(0);
672 sa.sa_handler = SIG_IGN;
674 sigemptyset(&sa.sa_mask);
675 sigaction(SIGHUP, &sa, NULL);
676 sigaction(SIGINT, &sa, NULL);
677 sigaction(SIGTERM, &sa, NULL);
678 sigaction(SIGPIPE, &sa, NULL);
679 /* WARNING: the following works on Linux and SysV, but not BSD! */
680 sigaction(SIGCHLD, &sa, NULL);
682 /* Daemons should close all extra filehandles ... *before* RPC init. */
686 new_cache = check_new_cache();
690 if (nfs_version & 0x1)
691 rpc_init("mountd", MOUNTPROG, MOUNTVERS,
692 mount_dispatch, port);
693 if (nfs_version & (0x1 << 1))
694 rpc_init("mountd", MOUNTPROG, MOUNTVERS_POSIX,
695 mount_dispatch, port);
696 if (nfs_version & (0x1 << 2))
697 rpc_init("mountd", MOUNTPROG, MOUNTVERS_NFSV3,
698 mount_dispatch, port);
700 sa.sa_handler = killer;
701 sigaction(SIGINT, &sa, NULL);
702 sigaction(SIGTERM, &sa, NULL);
703 sa.sa_handler = sig_hup;
704 sigaction(SIGHUP, &sa, NULL);
706 auth_init(export_file);
709 /* We first fork off a child. */
710 if ((c = fork()) > 0)
713 xlog(L_FATAL, "mountd: cannot fork: %s\n",
716 /* Now we remove ourselves from the foreground.
717 Redirect stdin/stdout/stderr first. */
719 int fd = open("/dev/null", O_RDWR);
723 if (fd > 2) (void) close(fd);
728 /* silently bounds check num_threads */
731 else if (num_threads < 1)
733 else if (num_threads > MAX_THREADS)
734 num_threads = MAX_THREADS;
741 xlog(L_ERROR, "Ack! Gack! svc_run returned!\n");
746 usage(const char *prog, int n)
749 "Usage: %s [-F|--foreground] [-h|--help] [-v|--version] [-d kind|--debug kind]\n"
750 " [-o num|--descriptors num] [-f exports-file|--exports-file=file]\n"
751 " [-p|--port port] [-V version|--nfs-version version]\n"
752 " [-N version|--no-nfs-version version] [-n|--no-tcp]\n"
753 " [-H ha-callout-prog] [-s|--state-directory-path path]\n"
754 " [-g|--manage-gids] [-t num|--num-threads=num]\n", prog);