4 * Parse the exports file. Derived from the unfsd implementation.
6 * Authors: Donald J. Becker, <becker@super.org>
7 * Rick Sladkey, <jrs@world.std.com>
8 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
9 * Olaf Kirch, <okir@monad.swb.de>
10 * Alexander O. Yuriev, <alex@bach.cis.temple.edu>
12 * This software maybe be used for any purpose provided
13 * the above copyright notice is retained. It is supplied
14 * as is, with no warranty expressed or implied.
21 #include <sys/param.h>
33 #include "pseudoflavors.h"
35 #define EXPORT_DEFAULT_FLAGS \
36 (NFSEXP_READONLY|NFSEXP_ROOTSQUASH|NFSEXP_GATHERED_WRITES|NFSEXP_NOSUBTREECHECK)
38 struct flav_info flav_map[] = {
39 { "krb5", RPC_AUTH_GSS_KRB5 },
40 { "krb5i", RPC_AUTH_GSS_KRB5I },
41 { "krb5p", RPC_AUTH_GSS_KRB5P },
42 { "lipkey", RPC_AUTH_GSS_LKEY },
43 { "lipkey-i", RPC_AUTH_GSS_LKEYI },
44 { "lipkey-p", RPC_AUTH_GSS_LKEYP },
45 { "spkm3", RPC_AUTH_GSS_SPKM },
46 { "spkm3i", RPC_AUTH_GSS_SPKMI },
47 { "spkm3p", RPC_AUTH_GSS_SPKMP },
48 { "unix", AUTH_UNIX },
50 { "null", AUTH_NULL },
51 { "none", AUTH_NONE },
54 const int flav_map_size = sizeof(flav_map)/sizeof(flav_map[0]);
58 static char *efname = NULL;
59 static XFILE *efp = NULL;
61 static int has_default_opts, has_default_subtree_opts;
62 static int *squids = NULL, nsquids = 0,
63 *sqgids = NULL, nsqgids = 0;
65 static int getexport(char *exp, int len);
66 static int getpath(char *path, int len);
67 static int parseopts(char *cp, struct exportent *ep, int warn, int *had_subtree_opt_ptr);
68 static int parsesquash(char *list, int **idp, int *lenp, char **ep);
69 static int parsenum(char **cpp);
70 static void freesquash(void);
71 static void syntaxerr(char *msg);
74 setexportent(char *fname, char *type)
79 fname = _PATH_EXPORTS;
80 if (!(efp = xfopen(fname, type)))
81 xlog(L_ERROR, "can't open %s for %sing",
82 fname, strcmp(type, "r")? "writ" : "read");
83 efname = strdup(fname);
87 static void init_exportent (struct exportent *ee, int fromkernel)
89 ee->e_flags = EXPORT_DEFAULT_FLAGS;
90 /* some kernels assume the default is sync rather than
91 * async. More recent kernels always report one or other,
92 * but this test makes sure we assume same as kernel
96 ee->e_flags &= ~NFSEXP_ASYNC;
97 ee->e_flags &= ~NFSEXP_GATHERED_WRITES;
99 ee->e_anonuid = 65534;
100 ee->e_anongid = 65534;
103 ee->e_mountpoint = NULL;
104 ee->e_fslocmethod = FSLOC_NONE;
105 ee->e_fslocdata = NULL;
106 ee->e_secinfo[0].flav = NULL;
110 ee->e_ttl = DEFAULT_TTL;
114 getexportent(int fromkernel, int fromexports)
116 static struct exportent ee, def_ee;
117 char exp[512], *hostname;
118 char rpath[MAXPATHLEN+1];
127 if (first || (ok = getexport(exp, sizeof(exp))) == 0) {
128 has_default_opts = 0;
129 has_default_subtree_opts = 0;
131 init_exportent(&def_ee, fromkernel);
133 ok = getpath(def_ee.e_path, sizeof(def_ee.e_path));
137 ok = getexport(exp, sizeof(exp));
140 xlog(L_ERROR, "expected client(options...)");
141 export_errno = EINVAL;
146 /* Check for default options */
148 if (parseopts(exp + 1, &def_ee, 0, &has_default_subtree_opts) < 0)
151 has_default_opts = 1;
153 ok = getexport(exp, sizeof(exp));
155 xlog(L_ERROR, "expected client(options...)");
156 export_errno = EINVAL;
163 /* Check for default client */
168 if ((opt = strchr(exp, '(')) != NULL) {
170 xlog(L_WARNING, "No host name given with %s %s, suggest *%s to avoid warning", ee.e_path, exp, exp);
174 if (!(sp = strchr(opt, ')')) || sp[1] != '\0') {
175 syntaxerr("bad option list");
176 export_errno = EINVAL;
181 if (!has_default_opts)
182 xlog(L_WARNING, "No options for %s %s: suggest %s(sync) to avoid warning", ee.e_path, exp, exp);
184 xfree(ee.e_hostname);
185 ee.e_hostname = xstrdup(hostname);
187 if (parseopts(opt, &ee, fromexports && !has_default_subtree_opts, NULL) < 0)
190 /* resolve symlinks */
191 if (realpath(ee.e_path, rpath) != NULL) {
192 rpath[sizeof (rpath) - 1] = '\0';
193 strncpy(ee.e_path, rpath, sizeof (ee.e_path) - 1);
194 ee.e_path[sizeof (ee.e_path) - 1] = '\0';
200 void secinfo_show(FILE *fp, struct exportent *ep)
202 struct sec_entry *p1, *p2;
205 for (p1=ep->e_secinfo; p1->flav; p1=p2) {
207 fprintf(fp, ",sec=%s", p1->flav->flavour);
208 for (p2=p1+1; (p2->flav != NULL) && (p1->flags == p2->flags);
210 fprintf(fp, ":%s", p2->flav->flavour);
213 fprintf(fp, ",%s", (flags & NFSEXP_READONLY) ? "ro" : "rw");
214 fprintf(fp, ",%sroot_squash", (flags & NFSEXP_ROOTSQUASH)?
216 fprintf(fp, ",%sall_squash", (flags & NFSEXP_ALLSQUASH)?
222 putexportent(struct exportent *ep)
226 char *esc=ep->e_path;
232 for (i=0; esc[i]; i++)
233 if (iscntrl(esc[i]) || esc[i] == '"' || esc[i] == '\\' || esc[i] == '#' || isspace(esc[i]))
234 fprintf(fp, "\\%03o", esc[i]);
236 fprintf(fp, "%c", esc[i]);
238 fprintf(fp, "\t%s(", ep->e_hostname);
239 fprintf(fp, "%s,", (ep->e_flags & NFSEXP_READONLY)? "ro" : "rw");
240 fprintf(fp, "%ssync,", (ep->e_flags & NFSEXP_ASYNC)? "a" : "");
241 fprintf(fp, "%swdelay,", (ep->e_flags & NFSEXP_GATHERED_WRITES)?
243 fprintf(fp, "%shide,", (ep->e_flags & NFSEXP_NOHIDE)?
245 fprintf(fp, "%scrossmnt,", (ep->e_flags & NFSEXP_CROSSMOUNT)?
247 fprintf(fp, "%ssecure,", (ep->e_flags & NFSEXP_INSECURE_PORT)?
249 fprintf(fp, "%sroot_squash,", (ep->e_flags & NFSEXP_ROOTSQUASH)?
251 fprintf(fp, "%sall_squash,", (ep->e_flags & NFSEXP_ALLSQUASH)?
253 fprintf(fp, "%ssubtree_check,", (ep->e_flags & NFSEXP_NOSUBTREECHECK)?
255 fprintf(fp, "%ssecure_locks,", (ep->e_flags & NFSEXP_NOAUTHNLM)?
257 fprintf(fp, "%sacl,", (ep->e_flags & NFSEXP_NOACL)?
259 if (ep->e_flags & NFSEXP_FSID) {
260 fprintf(fp, "fsid=%d,", ep->e_fsid);
263 fprintf(fp, "fsid=%s,", ep->e_uuid);
264 if (ep->e_mountpoint)
265 fprintf(fp, "mountpoint%s%s,",
266 ep->e_mountpoint[0]?"=":"", ep->e_mountpoint);
267 switch (ep->e_fslocmethod) {
271 fprintf(fp, "refer=%s,", ep->e_fslocdata);
274 fprintf(fp, "replicas=%s,", ep->e_fslocdata);
278 fprintf(fp, "fsloc=stub,");
282 xlog(L_ERROR, "unknown fsloc method for %s:%s",
283 ep->e_hostname, ep->e_path);
285 if ((id = ep->e_squids) != NULL) {
286 fprintf(fp, "squash_uids=");
287 for (i = 0; i < ep->e_nsquids; i += 2)
288 if (id[i] != id[i+1])
289 fprintf(fp, "%d-%d,", id[i], id[i+1]);
291 fprintf(fp, "%d,", id[i]);
293 if ((id = ep->e_sqgids) != NULL) {
294 fprintf(fp, "squash_gids=");
295 for (i = 0; i < ep->e_nsquids; i += 2)
296 if (id[i] != id[i+1])
297 fprintf(fp, "%d-%d,", id[i], id[i+1]);
299 fprintf(fp, "%d,", id[i]);
301 fprintf(fp, "anonuid=%d,anongid=%d", ep->e_anonuid, ep->e_anongid);
302 secinfo_show(fp, ep);
319 dupexportent(struct exportent *dst, struct exportent *src)
324 if ((n = src->e_nsquids) != 0) {
325 dst->e_squids = (int *) xmalloc(n * sizeof(int));
326 memcpy(dst->e_squids, src->e_squids, n * sizeof(int));
328 if ((n = src->e_nsqgids) != 0) {
329 dst->e_sqgids = (int *) xmalloc(n * sizeof(int));
330 memcpy(dst->e_sqgids, src->e_sqgids, n * sizeof(int));
332 if (src->e_mountpoint)
333 dst->e_mountpoint = strdup(src->e_mountpoint);
334 if (src->e_fslocdata)
335 dst->e_fslocdata = strdup(src->e_fslocdata);
337 dst->e_uuid = strdup(src->e_uuid);
338 dst->e_hostname = NULL;
342 mkexportent(char *hname, char *path, char *options)
344 static struct exportent ee;
346 init_exportent(&ee, 0);
348 xfree(ee.e_hostname);
349 ee.e_hostname = xstrdup(hname);
351 if (strlen(path) >= sizeof(ee.e_path)) {
352 xlog(L_WARNING, "path name %s too long", path);
355 strncpy(ee.e_path, path, sizeof (ee.e_path));
356 ee.e_path[sizeof (ee.e_path) - 1] = '\0';
357 if (parseopts(options, &ee, 0, NULL) < 0)
363 updateexportent(struct exportent *eep, char *options)
365 if (parseopts(options, eep, 0, NULL) < 0)
371 static int valid_uuid(char *uuid)
373 /* must have 32 hex digits */
375 for (cnt = 0 ; *uuid; uuid++)
382 * Append the given flavor to the exportent's e_secinfo array, or
383 * do nothing if it's already there. Returns the index of flavor
384 * in the resulting array in any case.
386 int secinfo_addflavor(struct flav_info *flav, struct exportent *ep)
390 for (p=ep->e_secinfo; p->flav; p++) {
392 return p - ep->e_secinfo;
394 if (p - ep->e_secinfo >= SECFLAVOR_COUNT) {
395 xlog(L_ERROR, "more than %d security flavors on an export\n",
400 p->flags = ep->e_flags;
402 return p - ep->e_secinfo;
405 static struct flav_info *find_flavor(char *name)
407 struct flav_info *flav;
408 for (flav = flav_map; flav < flav_map + flav_map_size; flav++)
409 if (strcmp(flav->flavour, name) == 0)
414 /* @str is a colon seperated list of security flavors. Their order
415 * is recorded in @ep, and a bitmap corresponding to the list is returned.
416 * A zero return indicates an error.
418 static unsigned int parse_flavors(char *str, struct exportent *ep)
424 while ( (flavor=strsep(&str, ":")) ) {
425 struct flav_info *flav = find_flavor(flavor);
427 xlog(L_ERROR, "unknown flavor %s\n", flavor);
430 bit = secinfo_addflavor(flav, ep);
438 /* Sets the bits in @mask for the appropriate security flavor flags. */
439 static void setflags(int mask, unsigned int active, struct exportent *ep)
447 ep->e_secinfo[bit].flags |= mask;
453 /* Clears the bits in @mask for the appropriate security flavor flags. */
454 static void clearflags(int mask, unsigned int active, struct exportent *ep)
458 ep->e_flags &= ~mask;
462 ep->e_secinfo[bit].flags &= ~mask;
469 * For those flags which are not allowed to vary by pseudoflavor,
470 * ensure that the export flags agree with the flags on each
473 static void fix_pseudoflavor_flags(struct exportent *ep)
475 struct export_features *ef;
478 ef = get_export_features();
479 for (p = ep->e_secinfo; p->flav; p++)
480 p->flags |= ep->e_flags & ~ef->secinfo_flags;
484 * Parse option string pointed to by cp and set mount options accordingly.
487 parseopts(char *cp, struct exportent *ep, int warn, int *had_subtree_opt_ptr)
489 int had_subtree_opt = 0;
490 char *flname = efname?efname:"command line";
491 int flline = efp?efp->x_line:0;
492 unsigned int active = 0;
494 squids = ep->e_squids; nsquids = ep->e_nsquids;
495 sqgids = ep->e_sqgids; nsqgids = ep->e_nsqgids;
503 char *opt = strdup(cp);
505 while (*cp && *cp != ',')
508 opt[cp-optstart] = '\0';
512 /* process keyword */
513 if (strcmp(opt, "ro") == 0)
514 setflags(NFSEXP_READONLY, active, ep);
515 else if (strcmp(opt, "rw") == 0)
516 clearflags(NFSEXP_READONLY, active, ep);
517 else if (!strcmp(opt, "secure"))
518 clearflags(NFSEXP_INSECURE_PORT, active, ep);
519 else if (!strcmp(opt, "insecure"))
520 setflags(NFSEXP_INSECURE_PORT, active, ep);
521 else if (!strcmp(opt, "sync"))
522 clearflags(NFSEXP_ASYNC, active, ep);
523 else if (!strcmp(opt, "async"))
524 setflags(NFSEXP_ASYNC, active, ep);
525 else if (!strcmp(opt, "nohide"))
526 setflags(NFSEXP_NOHIDE, active, ep);
527 else if (!strcmp(opt, "hide"))
528 clearflags(NFSEXP_NOHIDE, active, ep);
529 else if (!strcmp(opt, "crossmnt"))
530 setflags(NFSEXP_CROSSMOUNT, active, ep);
531 else if (!strcmp(opt, "nocrossmnt"))
532 clearflags(NFSEXP_CROSSMOUNT, active, ep);
533 else if (!strcmp(opt, "wdelay"))
534 setflags(NFSEXP_GATHERED_WRITES, active, ep);
535 else if (!strcmp(opt, "no_wdelay"))
536 clearflags(NFSEXP_GATHERED_WRITES, active, ep);
537 else if (strcmp(opt, "root_squash") == 0)
538 setflags(NFSEXP_ROOTSQUASH, active, ep);
539 else if (!strcmp(opt, "no_root_squash"))
540 clearflags(NFSEXP_ROOTSQUASH, active, ep);
541 else if (strcmp(opt, "all_squash") == 0)
542 setflags(NFSEXP_ALLSQUASH, active, ep);
543 else if (strcmp(opt, "no_all_squash") == 0)
544 clearflags(NFSEXP_ALLSQUASH, active, ep);
545 else if (strcmp(opt, "subtree_check") == 0) {
547 clearflags(NFSEXP_NOSUBTREECHECK, active, ep);
548 } else if (strcmp(opt, "no_subtree_check") == 0) {
550 setflags(NFSEXP_NOSUBTREECHECK, active, ep);
551 } else if (strcmp(opt, "auth_nlm") == 0)
552 clearflags(NFSEXP_NOAUTHNLM, active, ep);
553 else if (strcmp(opt, "no_auth_nlm") == 0)
554 setflags(NFSEXP_NOAUTHNLM, active, ep);
555 else if (strcmp(opt, "secure_locks") == 0)
556 clearflags(NFSEXP_NOAUTHNLM, active, ep);
557 else if (strcmp(opt, "insecure_locks") == 0)
558 setflags(NFSEXP_NOAUTHNLM, active, ep);
559 else if (strcmp(opt, "acl") == 0)
560 clearflags(NFSEXP_NOACL, active, ep);
561 else if (strcmp(opt, "no_acl") == 0)
562 setflags(NFSEXP_NOACL, active, ep);
563 else if (strncmp(opt, "anonuid=", 8) == 0) {
565 ep->e_anonuid = strtol(opt+8, &oe, 10);
566 if (opt[8]=='\0' || *oe != '\0') {
567 xlog(L_ERROR, "%s: %d: bad anonuid \"%s\"\n",
568 flname, flline, opt);
571 export_errno = EINVAL;
574 } else if (strncmp(opt, "anongid=", 8) == 0) {
576 ep->e_anongid = strtol(opt+8, &oe, 10);
577 if (opt[8]=='\0' || *oe != '\0') {
578 xlog(L_ERROR, "%s: %d: bad anongid \"%s\"\n",
579 flname, flline, opt);
582 } else if (strncmp(opt, "squash_uids=", 12) == 0) {
583 if (parsesquash(opt+12, &squids, &nsquids, &cp) < 0) {
586 } else if (strncmp(opt, "squash_gids=", 12) == 0) {
587 if (parsesquash(opt+12, &sqgids, &nsqgids, &cp) < 0) {
590 } else if (strncmp(opt, "fsid=", 5) == 0) {
592 if (strcmp(opt+5, "root") == 0) {
594 setflags(NFSEXP_FSID, active, ep);
596 ep->e_fsid = strtoul(opt+5, &oe, 0);
597 if (opt[5]!='\0' && *oe == '\0')
598 setflags(NFSEXP_FSID, active, ep);
599 else if (valid_uuid(opt+5))
600 ep->e_uuid = strdup(opt+5);
602 xlog(L_ERROR, "%s: %d: bad fsid \"%s\"\n",
603 flname, flline, opt);
607 } else if (strcmp(opt, "mountpoint")==0 ||
608 strcmp(opt, "mp") == 0 ||
609 strncmp(opt, "mountpoint=", 11)==0 ||
610 strncmp(opt, "mp=", 3) == 0) {
611 char * mp = strchr(opt, '=');
613 ep->e_mountpoint = strdup(mp+1);
615 ep->e_mountpoint = strdup("");
617 } else if (strncmp(opt, "fsloc=", 6) == 0) {
618 if (strcmp(opt+6, "stub") == 0)
619 ep->e_fslocmethod = FSLOC_STUB;
621 xlog(L_ERROR, "%s:%d: bad option %s\n",
622 flname, flline, opt);
626 } else if (strncmp(opt, "refer=", 6) == 0) {
627 ep->e_fslocmethod = FSLOC_REFER;
628 ep->e_fslocdata = strdup(opt+6);
629 } else if (strncmp(opt, "replicas=", 9) == 0) {
630 ep->e_fslocmethod = FSLOC_REPLICA;
631 ep->e_fslocdata = strdup(opt+9);
632 } else if (strncmp(opt, "sec=", 4) == 0) {
633 active = parse_flavors(opt+4, ep);
637 xlog(L_ERROR, "%s:%d: unknown keyword \"%s\"\n",
638 flname, flline, opt);
639 setflags(NFSEXP_ALLSQUASH | NFSEXP_READONLY, active, ep);
647 fix_pseudoflavor_flags(ep);
648 ep->e_squids = squids;
649 ep->e_sqgids = sqgids;
650 ep->e_nsquids = nsquids;
651 ep->e_nsqgids = nsqgids;
654 if (warn && !had_subtree_opt)
655 xlog(L_WARNING, "%s [%d]: Neither 'subtree_check' or 'no_subtree_check' specified for export \"%s:%s\".\n"
656 " Assuming default behaviour ('no_subtree_check').\n"
657 " NOTE: this default has changed since nfs-utils version 1.0.x\n",
660 ep->e_hostname, ep->e_path);
661 if (had_subtree_opt_ptr)
662 *had_subtree_opt_ptr = had_subtree_opt;
668 parsesquash(char *list, int **idp, int *lenp, char **ep)
686 if (id0 == -1 || id1 == -1) {
687 syntaxerr("uid/gid -1 not permitted");
691 id = (int *) xrealloc(id, (len + 8) * sizeof(*id));
694 if (!*cp || *cp == ')' || (*cp == ',' && !isdigit(cp[1])))
697 syntaxerr("bad uid/gid list");
703 if (**ep == ',') (*ep)++;
733 while (isdigit(**cpp))
735 c = **cpp; **cpp = '\0'; num = atoi(cp); **cpp = c;
740 getpath(char *path, int len)
743 return xgettok(efp, 0, path, len);
747 getexport(char *exp, int len)
752 if ((ok = xgettok(efp, 0, exp, len)) < 0)
753 xlog(L_ERROR, "%s:%d: syntax error",
754 efname?"command line":efname, efp->x_line);
761 xlog(L_ERROR, "%s:%d: syntax error: %s",
762 efname, efp?efp->x_line:0, msg);
764 struct export_features *get_export_features(void)
766 static char *path = "/proc/fs/nfsd/export_features";
767 static struct export_features ef;
768 static int cached = 0;
776 ef.flags = NFSEXP_OLDFLAGS;
777 ef.secinfo_flags = NFSEXP_OLD_SECINFO_FLAGS;
779 fd = open(path, O_RDONLY);
782 fd = read(fd, buf, 50);
785 c = sscanf(buf, "%x %x", &ef.flags, &ef.secinfo_flags);
792 xlog(L_WARNING, "unexpected error reading %s", path);