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 { "unix", AUTH_UNIX },
47 { "null", AUTH_NULL },
48 { "none", AUTH_NONE },
51 const int flav_map_size = sizeof(flav_map)/sizeof(flav_map[0]);
55 static char *efname = NULL;
56 static XFILE *efp = NULL;
58 static int has_default_opts, has_default_subtree_opts;
59 static int *squids = NULL, nsquids = 0,
60 *sqgids = NULL, nsqgids = 0;
62 static int getexport(char *exp, int len);
63 static int getpath(char *path, int len);
64 static int parseopts(char *cp, struct exportent *ep, int warn, int *had_subtree_opt_ptr);
65 static int parsesquash(char *list, int **idp, int *lenp, char **ep);
66 static int parsenum(char **cpp);
67 static void freesquash(void);
68 static void syntaxerr(char *msg);
71 setexportent(char *fname, char *type)
76 fname = _PATH_EXPORTS;
77 if (!(efp = xfopen(fname, type)))
78 xlog(L_ERROR, "can't open %s for %sing",
79 fname, strcmp(type, "r")? "writ" : "read");
80 efname = strdup(fname);
84 static void init_exportent (struct exportent *ee, int fromkernel)
86 ee->e_flags = EXPORT_DEFAULT_FLAGS;
87 /* some kernels assume the default is sync rather than
88 * async. More recent kernels always report one or other,
89 * but this test makes sure we assume same as kernel
93 ee->e_flags &= ~NFSEXP_ASYNC;
94 ee->e_flags &= ~NFSEXP_GATHERED_WRITES;
96 ee->e_anonuid = 65534;
97 ee->e_anongid = 65534;
100 ee->e_mountpoint = NULL;
101 ee->e_fslocmethod = FSLOC_NONE;
102 ee->e_fslocdata = NULL;
103 ee->e_secinfo[0].flav = NULL;
107 ee->e_ttl = DEFAULT_TTL;
111 getexportent(int fromkernel, int fromexports)
113 static struct exportent ee, def_ee;
114 char exp[512], *hostname;
115 char rpath[MAXPATHLEN+1];
124 if (first || (ok = getexport(exp, sizeof(exp))) == 0) {
125 has_default_opts = 0;
126 has_default_subtree_opts = 0;
128 init_exportent(&def_ee, fromkernel);
130 ok = getpath(def_ee.e_path, sizeof(def_ee.e_path));
134 ok = getexport(exp, sizeof(exp));
137 xlog(L_ERROR, "expected client(options...)");
138 export_errno = EINVAL;
144 * Check for default options. The kernel will never have default
145 * options in /proc/fs/nfs/exports, however due to the initial '-' in
146 * the -test-client- string from the test export we have to check that
147 * we're not reading from the kernel.
149 if (exp[0] == '-' && !fromkernel) {
150 if (parseopts(exp + 1, &def_ee, 0, &has_default_subtree_opts) < 0)
153 has_default_opts = 1;
155 ok = getexport(exp, sizeof(exp));
157 xlog(L_ERROR, "expected client(options...)");
158 export_errno = EINVAL;
165 /* Check for default client */
170 if ((opt = strchr(exp, '(')) != NULL) {
172 xlog(L_WARNING, "No host name given with %s %s, suggest *%s to avoid warning", ee.e_path, exp, exp);
176 if (!(sp = strchr(opt, ')')) || sp[1] != '\0') {
177 syntaxerr("bad option list");
178 export_errno = EINVAL;
183 if (!has_default_opts)
184 xlog(L_WARNING, "No options for %s %s: suggest %s(sync) to avoid warning", ee.e_path, exp, exp);
186 xfree(ee.e_hostname);
187 ee.e_hostname = xstrdup(hostname);
189 if (parseopts(opt, &ee, fromexports && !has_default_subtree_opts, NULL) < 0)
192 /* resolve symlinks */
193 if (realpath(ee.e_path, rpath) != NULL) {
194 rpath[sizeof (rpath) - 1] = '\0';
195 strncpy(ee.e_path, rpath, sizeof (ee.e_path) - 1);
196 ee.e_path[sizeof (ee.e_path) - 1] = '\0';
202 void secinfo_show(FILE *fp, struct exportent *ep)
204 struct sec_entry *p1, *p2;
207 for (p1=ep->e_secinfo; p1->flav; p1=p2) {
209 fprintf(fp, ",sec=%s", p1->flav->flavour);
210 for (p2=p1+1; (p2->flav != NULL) && (p1->flags == p2->flags);
212 fprintf(fp, ":%s", p2->flav->flavour);
215 fprintf(fp, ",%s", (flags & NFSEXP_READONLY) ? "ro" : "rw");
216 fprintf(fp, ",%sroot_squash", (flags & NFSEXP_ROOTSQUASH)?
218 fprintf(fp, ",%sall_squash", (flags & NFSEXP_ALLSQUASH)?
224 putexportent(struct exportent *ep)
228 char *esc=ep->e_path;
234 for (i=0; esc[i]; i++)
235 if (iscntrl(esc[i]) || esc[i] == '"' || esc[i] == '\\' || esc[i] == '#' || isspace(esc[i]))
236 fprintf(fp, "\\%03o", esc[i]);
238 fprintf(fp, "%c", esc[i]);
240 fprintf(fp, "\t%s(", ep->e_hostname);
241 fprintf(fp, "%s,", (ep->e_flags & NFSEXP_READONLY)? "ro" : "rw");
242 fprintf(fp, "%ssync,", (ep->e_flags & NFSEXP_ASYNC)? "a" : "");
243 fprintf(fp, "%swdelay,", (ep->e_flags & NFSEXP_GATHERED_WRITES)?
245 fprintf(fp, "%shide,", (ep->e_flags & NFSEXP_NOHIDE)?
247 fprintf(fp, "%scrossmnt,", (ep->e_flags & NFSEXP_CROSSMOUNT)?
249 fprintf(fp, "%ssecure,", (ep->e_flags & NFSEXP_INSECURE_PORT)?
251 fprintf(fp, "%sroot_squash,", (ep->e_flags & NFSEXP_ROOTSQUASH)?
253 fprintf(fp, "%sall_squash,", (ep->e_flags & NFSEXP_ALLSQUASH)?
255 fprintf(fp, "%ssubtree_check,", (ep->e_flags & NFSEXP_NOSUBTREECHECK)?
257 fprintf(fp, "%ssecure_locks,", (ep->e_flags & NFSEXP_NOAUTHNLM)?
259 fprintf(fp, "%sacl,", (ep->e_flags & NFSEXP_NOACL)?
261 if (ep->e_flags & NFSEXP_FSID) {
262 fprintf(fp, "fsid=%d,", ep->e_fsid);
265 fprintf(fp, "fsid=%s,", ep->e_uuid);
266 if (ep->e_mountpoint)
267 fprintf(fp, "mountpoint%s%s,",
268 ep->e_mountpoint[0]?"=":"", ep->e_mountpoint);
269 switch (ep->e_fslocmethod) {
273 fprintf(fp, "refer=%s,", ep->e_fslocdata);
276 fprintf(fp, "replicas=%s,", ep->e_fslocdata);
280 fprintf(fp, "fsloc=stub,");
284 xlog(L_ERROR, "unknown fsloc method for %s:%s",
285 ep->e_hostname, ep->e_path);
287 if ((id = ep->e_squids) != NULL) {
288 fprintf(fp, "squash_uids=");
289 for (i = 0; i < ep->e_nsquids; i += 2)
290 if (id[i] != id[i+1])
291 fprintf(fp, "%d-%d,", id[i], id[i+1]);
293 fprintf(fp, "%d,", id[i]);
295 if ((id = ep->e_sqgids) != NULL) {
296 fprintf(fp, "squash_gids=");
297 for (i = 0; i < ep->e_nsquids; i += 2)
298 if (id[i] != id[i+1])
299 fprintf(fp, "%d-%d,", id[i], id[i+1]);
301 fprintf(fp, "%d,", id[i]);
303 fprintf(fp, "anonuid=%d,anongid=%d", ep->e_anonuid, ep->e_anongid);
304 secinfo_show(fp, ep);
321 dupexportent(struct exportent *dst, struct exportent *src)
326 if ((n = src->e_nsquids) != 0) {
327 dst->e_squids = (int *) xmalloc(n * sizeof(int));
328 memcpy(dst->e_squids, src->e_squids, n * sizeof(int));
330 if ((n = src->e_nsqgids) != 0) {
331 dst->e_sqgids = (int *) xmalloc(n * sizeof(int));
332 memcpy(dst->e_sqgids, src->e_sqgids, n * sizeof(int));
334 if (src->e_mountpoint)
335 dst->e_mountpoint = strdup(src->e_mountpoint);
336 if (src->e_fslocdata)
337 dst->e_fslocdata = strdup(src->e_fslocdata);
339 dst->e_uuid = strdup(src->e_uuid);
340 dst->e_hostname = NULL;
344 mkexportent(char *hname, char *path, char *options)
346 static struct exportent ee;
348 init_exportent(&ee, 0);
350 xfree(ee.e_hostname);
351 ee.e_hostname = xstrdup(hname);
353 if (strlen(path) >= sizeof(ee.e_path)) {
354 xlog(L_WARNING, "path name %s too long", path);
357 strncpy(ee.e_path, path, sizeof (ee.e_path));
358 ee.e_path[sizeof (ee.e_path) - 1] = '\0';
359 if (parseopts(options, &ee, 0, NULL) < 0)
365 updateexportent(struct exportent *eep, char *options)
367 if (parseopts(options, eep, 0, NULL) < 0)
373 static int valid_uuid(char *uuid)
375 /* must have 32 hex digits */
377 for (cnt = 0 ; *uuid; uuid++)
384 * Append the given flavor to the exportent's e_secinfo array, or
385 * do nothing if it's already there. Returns the index of flavor
386 * in the resulting array in any case.
388 int secinfo_addflavor(struct flav_info *flav, struct exportent *ep)
392 for (p=ep->e_secinfo; p->flav; p++) {
394 return p - ep->e_secinfo;
396 if (p - ep->e_secinfo >= SECFLAVOR_COUNT) {
397 xlog(L_ERROR, "more than %d security flavors on an export\n",
402 p->flags = ep->e_flags;
404 return p - ep->e_secinfo;
407 static struct flav_info *find_flavor(char *name)
409 struct flav_info *flav;
410 for (flav = flav_map; flav < flav_map + flav_map_size; flav++)
411 if (strcmp(flav->flavour, name) == 0)
416 /* @str is a colon seperated list of security flavors. Their order
417 * is recorded in @ep, and a bitmap corresponding to the list is returned.
418 * A zero return indicates an error.
420 static unsigned int parse_flavors(char *str, struct exportent *ep)
426 while ( (flavor=strsep(&str, ":")) ) {
427 struct flav_info *flav = find_flavor(flavor);
429 xlog(L_ERROR, "unknown flavor %s\n", flavor);
432 bit = secinfo_addflavor(flav, ep);
440 /* Sets the bits in @mask for the appropriate security flavor flags. */
441 static void setflags(int mask, unsigned int active, struct exportent *ep)
449 ep->e_secinfo[bit].flags |= mask;
455 /* Clears the bits in @mask for the appropriate security flavor flags. */
456 static void clearflags(int mask, unsigned int active, struct exportent *ep)
460 ep->e_flags &= ~mask;
464 ep->e_secinfo[bit].flags &= ~mask;
471 * For those flags which are not allowed to vary by pseudoflavor,
472 * ensure that the export flags agree with the flags on each
475 static void fix_pseudoflavor_flags(struct exportent *ep)
477 struct export_features *ef;
480 ef = get_export_features();
481 for (p = ep->e_secinfo; p->flav; p++)
482 p->flags |= ep->e_flags & ~ef->secinfo_flags;
486 * Parse option string pointed to by cp and set mount options accordingly.
489 parseopts(char *cp, struct exportent *ep, int warn, int *had_subtree_opt_ptr)
491 int had_subtree_opt = 0;
492 char *flname = efname?efname:"command line";
493 int flline = efp?efp->x_line:0;
494 unsigned int active = 0;
496 squids = ep->e_squids; nsquids = ep->e_nsquids;
497 sqgids = ep->e_sqgids; nsqgids = ep->e_nsqgids;
505 char *opt = strdup(cp);
507 while (*cp && *cp != ',')
510 opt[cp-optstart] = '\0';
514 /* process keyword */
515 if (strcmp(opt, "ro") == 0)
516 setflags(NFSEXP_READONLY, active, ep);
517 else if (strcmp(opt, "rw") == 0)
518 clearflags(NFSEXP_READONLY, active, ep);
519 else if (!strcmp(opt, "secure"))
520 clearflags(NFSEXP_INSECURE_PORT, active, ep);
521 else if (!strcmp(opt, "insecure"))
522 setflags(NFSEXP_INSECURE_PORT, active, ep);
523 else if (!strcmp(opt, "sync"))
524 clearflags(NFSEXP_ASYNC, active, ep);
525 else if (!strcmp(opt, "async"))
526 setflags(NFSEXP_ASYNC, active, ep);
527 else if (!strcmp(opt, "nohide"))
528 setflags(NFSEXP_NOHIDE, active, ep);
529 else if (!strcmp(opt, "hide"))
530 clearflags(NFSEXP_NOHIDE, active, ep);
531 else if (!strcmp(opt, "crossmnt"))
532 setflags(NFSEXP_CROSSMOUNT, active, ep);
533 else if (!strcmp(opt, "nocrossmnt"))
534 clearflags(NFSEXP_CROSSMOUNT, active, ep);
535 else if (!strcmp(opt, "wdelay"))
536 setflags(NFSEXP_GATHERED_WRITES, active, ep);
537 else if (!strcmp(opt, "no_wdelay"))
538 clearflags(NFSEXP_GATHERED_WRITES, active, ep);
539 else if (strcmp(opt, "root_squash") == 0)
540 setflags(NFSEXP_ROOTSQUASH, active, ep);
541 else if (!strcmp(opt, "no_root_squash"))
542 clearflags(NFSEXP_ROOTSQUASH, active, ep);
543 else if (strcmp(opt, "all_squash") == 0)
544 setflags(NFSEXP_ALLSQUASH, active, ep);
545 else if (strcmp(opt, "no_all_squash") == 0)
546 clearflags(NFSEXP_ALLSQUASH, active, ep);
547 else if (strcmp(opt, "subtree_check") == 0) {
549 clearflags(NFSEXP_NOSUBTREECHECK, active, ep);
550 } else if (strcmp(opt, "no_subtree_check") == 0) {
552 setflags(NFSEXP_NOSUBTREECHECK, active, ep);
553 } else if (strcmp(opt, "auth_nlm") == 0)
554 clearflags(NFSEXP_NOAUTHNLM, active, ep);
555 else if (strcmp(opt, "no_auth_nlm") == 0)
556 setflags(NFSEXP_NOAUTHNLM, active, ep);
557 else if (strcmp(opt, "secure_locks") == 0)
558 clearflags(NFSEXP_NOAUTHNLM, active, ep);
559 else if (strcmp(opt, "insecure_locks") == 0)
560 setflags(NFSEXP_NOAUTHNLM, active, ep);
561 else if (strcmp(opt, "acl") == 0)
562 clearflags(NFSEXP_NOACL, active, ep);
563 else if (strcmp(opt, "no_acl") == 0)
564 setflags(NFSEXP_NOACL, active, ep);
565 else if (strncmp(opt, "anonuid=", 8) == 0) {
567 ep->e_anonuid = strtol(opt+8, &oe, 10);
568 if (opt[8]=='\0' || *oe != '\0') {
569 xlog(L_ERROR, "%s: %d: bad anonuid \"%s\"\n",
570 flname, flline, opt);
573 export_errno = EINVAL;
576 } else if (strncmp(opt, "anongid=", 8) == 0) {
578 ep->e_anongid = strtol(opt+8, &oe, 10);
579 if (opt[8]=='\0' || *oe != '\0') {
580 xlog(L_ERROR, "%s: %d: bad anongid \"%s\"\n",
581 flname, flline, opt);
584 } else if (strncmp(opt, "squash_uids=", 12) == 0) {
585 if (parsesquash(opt+12, &squids, &nsquids, &cp) < 0) {
588 } else if (strncmp(opt, "squash_gids=", 12) == 0) {
589 if (parsesquash(opt+12, &sqgids, &nsqgids, &cp) < 0) {
592 } else if (strncmp(opt, "fsid=", 5) == 0) {
594 if (strcmp(opt+5, "root") == 0) {
596 setflags(NFSEXP_FSID, active, ep);
598 ep->e_fsid = strtoul(opt+5, &oe, 0);
599 if (opt[5]!='\0' && *oe == '\0')
600 setflags(NFSEXP_FSID, active, ep);
601 else if (valid_uuid(opt+5))
602 ep->e_uuid = strdup(opt+5);
604 xlog(L_ERROR, "%s: %d: bad fsid \"%s\"\n",
605 flname, flline, opt);
609 } else if (strcmp(opt, "mountpoint")==0 ||
610 strcmp(opt, "mp") == 0 ||
611 strncmp(opt, "mountpoint=", 11)==0 ||
612 strncmp(opt, "mp=", 3) == 0) {
613 char * mp = strchr(opt, '=');
615 ep->e_mountpoint = strdup(mp+1);
617 ep->e_mountpoint = strdup("");
619 } else if (strncmp(opt, "fsloc=", 6) == 0) {
620 if (strcmp(opt+6, "stub") == 0)
621 ep->e_fslocmethod = FSLOC_STUB;
623 xlog(L_ERROR, "%s:%d: bad option %s\n",
624 flname, flline, opt);
628 } else if (strncmp(opt, "refer=", 6) == 0) {
629 ep->e_fslocmethod = FSLOC_REFER;
630 ep->e_fslocdata = strdup(opt+6);
631 } else if (strncmp(opt, "replicas=", 9) == 0) {
632 ep->e_fslocmethod = FSLOC_REPLICA;
633 ep->e_fslocdata = strdup(opt+9);
634 } else if (strncmp(opt, "sec=", 4) == 0) {
635 active = parse_flavors(opt+4, ep);
639 xlog(L_ERROR, "%s:%d: unknown keyword \"%s\"\n",
640 flname, flline, opt);
641 setflags(NFSEXP_ALLSQUASH | NFSEXP_READONLY, active, ep);
649 fix_pseudoflavor_flags(ep);
650 ep->e_squids = squids;
651 ep->e_sqgids = sqgids;
652 ep->e_nsquids = nsquids;
653 ep->e_nsqgids = nsqgids;
656 if (warn && !had_subtree_opt)
657 xlog(L_WARNING, "%s [%d]: Neither 'subtree_check' or 'no_subtree_check' specified for export \"%s:%s\".\n"
658 " Assuming default behaviour ('no_subtree_check').\n"
659 " NOTE: this default has changed since nfs-utils version 1.0.x\n",
662 ep->e_hostname, ep->e_path);
663 if (had_subtree_opt_ptr)
664 *had_subtree_opt_ptr = had_subtree_opt;
670 parsesquash(char *list, int **idp, int *lenp, char **ep)
688 if (id0 == -1 || id1 == -1) {
689 syntaxerr("uid/gid -1 not permitted");
693 id = (int *) xrealloc(id, (len + 8) * sizeof(*id));
696 if (!*cp || *cp == ')' || (*cp == ',' && !isdigit(cp[1])))
699 syntaxerr("bad uid/gid list");
705 if (**ep == ',') (*ep)++;
735 while (isdigit(**cpp))
737 c = **cpp; **cpp = '\0'; num = atoi(cp); **cpp = c;
742 getpath(char *path, int len)
745 return xgettok(efp, 0, path, len);
749 getexport(char *exp, int len)
754 if ((ok = xgettok(efp, 0, exp, len)) < 0)
755 xlog(L_ERROR, "%s:%d: syntax error",
756 efname?"command line":efname, efp->x_line);
763 xlog(L_ERROR, "%s:%d: syntax error: %s",
764 efname, efp?efp->x_line:0, msg);
766 struct export_features *get_export_features(void)
768 static char *path = "/proc/fs/nfsd/export_features";
769 static struct export_features ef;
770 static int cached = 0;
778 ef.flags = NFSEXP_OLDFLAGS;
779 ef.secinfo_flags = NFSEXP_OLD_SECINFO_FLAGS;
781 fd = open(path, O_RDONLY);
784 c = read(fd, buf, 50);
788 c = sscanf(buf, "%x %x", &ef.flags, &ef.secinfo_flags);
795 xlog(L_WARNING, "unexpected error reading %s", path);