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;
113 getexportent(int fromkernel, int fromexports)
115 static struct exportent ee, def_ee;
116 char exp[512], *hostname;
117 char rpath[MAXPATHLEN+1];
126 if (first || (ok = getexport(exp, sizeof(exp))) == 0) {
127 has_default_opts = 0;
128 has_default_subtree_opts = 0;
130 init_exportent(&def_ee, fromkernel);
132 ok = getpath(def_ee.e_path, sizeof(def_ee.e_path));
136 ok = getexport(exp, sizeof(exp));
139 xlog(L_ERROR, "expected client(options...)");
140 export_errno = EINVAL;
145 /* Check for default options */
147 if (parseopts(exp + 1, &def_ee, 0, &has_default_subtree_opts) < 0)
150 has_default_opts = 1;
152 ok = getexport(exp, sizeof(exp));
154 xlog(L_ERROR, "expected client(options...)");
155 export_errno = EINVAL;
162 /* Check for default client */
167 if ((opt = strchr(exp, '(')) != NULL) {
169 xlog(L_WARNING, "No host name given with %s %s, suggest *%s to avoid warning", ee.e_path, exp, exp);
173 if (!(sp = strchr(opt, ')')) || sp[1] != '\0') {
174 syntaxerr("bad option list");
175 export_errno = EINVAL;
180 if (!has_default_opts)
181 xlog(L_WARNING, "No options for %s %s: suggest %s(sync) to avoid warning", ee.e_path, exp, exp);
183 xfree(ee.e_hostname);
184 ee.e_hostname = xstrdup(hostname);
186 if (parseopts(opt, &ee, fromexports && !has_default_subtree_opts, NULL) < 0)
189 /* resolve symlinks */
190 if (realpath(ee.e_path, rpath) != NULL) {
191 rpath[sizeof (rpath) - 1] = '\0';
192 strncpy(ee.e_path, rpath, sizeof (ee.e_path) - 1);
193 ee.e_path[sizeof (ee.e_path) - 1] = '\0';
199 void secinfo_show(FILE *fp, struct exportent *ep)
201 struct sec_entry *p1, *p2;
204 for (p1=ep->e_secinfo; p1->flav; p1=p2) {
206 fprintf(fp, ",sec=%s", p1->flav->flavour);
207 for (p2=p1+1; (p2->flav != NULL) && (p1->flags == p2->flags);
209 fprintf(fp, ":%s", p2->flav->flavour);
212 fprintf(fp, ",%s", (flags & NFSEXP_READONLY) ? "ro" : "rw");
213 fprintf(fp, ",%sroot_squash", (flags & NFSEXP_ROOTSQUASH)?
215 fprintf(fp, ",%sall_squash", (flags & NFSEXP_ALLSQUASH)?
221 putexportent(struct exportent *ep)
225 char *esc=ep->e_path;
231 for (i=0; esc[i]; i++)
232 if (iscntrl(esc[i]) || esc[i] == '"' || esc[i] == '\\' || esc[i] == '#' || isspace(esc[i]))
233 fprintf(fp, "\\%03o", esc[i]);
235 fprintf(fp, "%c", esc[i]);
237 fprintf(fp, "\t%s(", ep->e_hostname);
238 fprintf(fp, "%s,", (ep->e_flags & NFSEXP_READONLY)? "ro" : "rw");
239 fprintf(fp, "%ssync,", (ep->e_flags & NFSEXP_ASYNC)? "a" : "");
240 fprintf(fp, "%swdelay,", (ep->e_flags & NFSEXP_GATHERED_WRITES)?
242 fprintf(fp, "%shide,", (ep->e_flags & NFSEXP_NOHIDE)?
244 fprintf(fp, "%scrossmnt,", (ep->e_flags & NFSEXP_CROSSMOUNT)?
246 fprintf(fp, "%ssecure,", (ep->e_flags & NFSEXP_INSECURE_PORT)?
248 fprintf(fp, "%sroot_squash,", (ep->e_flags & NFSEXP_ROOTSQUASH)?
250 fprintf(fp, "%sall_squash,", (ep->e_flags & NFSEXP_ALLSQUASH)?
252 fprintf(fp, "%ssubtree_check,", (ep->e_flags & NFSEXP_NOSUBTREECHECK)?
254 fprintf(fp, "%ssecure_locks,", (ep->e_flags & NFSEXP_NOAUTHNLM)?
256 fprintf(fp, "%sacl,", (ep->e_flags & NFSEXP_NOACL)?
258 if (ep->e_flags & NFSEXP_FSID) {
259 fprintf(fp, "fsid=%d,", ep->e_fsid);
262 fprintf(fp, "fsid=%s,", ep->e_uuid);
263 if (ep->e_mountpoint)
264 fprintf(fp, "mountpoint%s%s,",
265 ep->e_mountpoint[0]?"=":"", ep->e_mountpoint);
266 switch (ep->e_fslocmethod) {
270 fprintf(fp, "refer=%s,", ep->e_fslocdata);
273 fprintf(fp, "replicas=%s,", ep->e_fslocdata);
277 fprintf(fp, "fsloc=stub,");
281 xlog(L_ERROR, "unknown fsloc method for %s:%s",
282 ep->e_hostname, ep->e_path);
284 if ((id = ep->e_squids) != NULL) {
285 fprintf(fp, "squash_uids=");
286 for (i = 0; i < ep->e_nsquids; i += 2)
287 if (id[i] != id[i+1])
288 fprintf(fp, "%d-%d,", id[i], id[i+1]);
290 fprintf(fp, "%d,", id[i]);
292 if ((id = ep->e_sqgids) != NULL) {
293 fprintf(fp, "squash_gids=");
294 for (i = 0; i < ep->e_nsquids; i += 2)
295 if (id[i] != id[i+1])
296 fprintf(fp, "%d-%d,", id[i], id[i+1]);
298 fprintf(fp, "%d,", id[i]);
300 fprintf(fp, "anonuid=%d,anongid=%d", ep->e_anonuid, ep->e_anongid);
301 secinfo_show(fp, ep);
318 dupexportent(struct exportent *dst, struct exportent *src)
323 if ((n = src->e_nsquids) != 0) {
324 dst->e_squids = (int *) xmalloc(n * sizeof(int));
325 memcpy(dst->e_squids, src->e_squids, n * sizeof(int));
327 if ((n = src->e_nsqgids) != 0) {
328 dst->e_sqgids = (int *) xmalloc(n * sizeof(int));
329 memcpy(dst->e_sqgids, src->e_sqgids, n * sizeof(int));
331 if (src->e_mountpoint)
332 dst->e_mountpoint = strdup(src->e_mountpoint);
333 if (src->e_fslocdata)
334 dst->e_fslocdata = strdup(src->e_fslocdata);
335 dst->e_hostname = NULL;
339 mkexportent(char *hname, char *path, char *options)
341 static struct exportent ee;
343 init_exportent(&ee, 0);
345 xfree(ee.e_hostname);
346 ee.e_hostname = xstrdup(hname);
348 if (strlen(path) >= sizeof(ee.e_path)) {
349 xlog(L_WARNING, "path name %s too long", path);
352 strncpy(ee.e_path, path, sizeof (ee.e_path));
353 ee.e_path[sizeof (ee.e_path) - 1] = '\0';
354 if (parseopts(options, &ee, 0, NULL) < 0)
360 updateexportent(struct exportent *eep, char *options)
362 if (parseopts(options, eep, 0, NULL) < 0)
368 static int valid_uuid(char *uuid)
370 /* must have 32 hex digits */
372 for (cnt = 0 ; *uuid; uuid++)
379 * Append the given flavor to the exportent's e_secinfo array, or
380 * do nothing if it's already there. Returns the index of flavor
381 * in the resulting array in any case.
383 int secinfo_addflavor(struct flav_info *flav, struct exportent *ep)
387 for (p=ep->e_secinfo; p->flav; p++) {
389 return p - ep->e_secinfo;
391 if (p - ep->e_secinfo >= SECFLAVOR_COUNT) {
392 xlog(L_ERROR, "more than %d security flavors on an export\n",
397 p->flags = ep->e_flags;
399 return p - ep->e_secinfo;
402 static struct flav_info *find_flavor(char *name)
404 struct flav_info *flav;
405 for (flav = flav_map; flav < flav_map + flav_map_size; flav++)
406 if (strcmp(flav->flavour, name) == 0)
411 /* @str is a colon seperated list of security flavors. Their order
412 * is recorded in @ep, and a bitmap corresponding to the list is returned.
413 * A zero return indicates an error.
415 static unsigned int parse_flavors(char *str, struct exportent *ep)
421 while ( (flavor=strsep(&str, ":")) ) {
422 struct flav_info *flav = find_flavor(flavor);
424 xlog(L_ERROR, "unknown flavor %s\n", flavor);
427 bit = secinfo_addflavor(flav, ep);
435 /* Sets the bits in @mask for the appropriate security flavor flags. */
436 static void setflags(int mask, unsigned int active, struct exportent *ep)
444 ep->e_secinfo[bit].flags |= mask;
450 /* Clears the bits in @mask for the appropriate security flavor flags. */
451 static void clearflags(int mask, unsigned int active, struct exportent *ep)
455 ep->e_flags &= ~mask;
459 ep->e_secinfo[bit].flags &= ~mask;
466 * For those flags which are not allowed to vary by pseudoflavor,
467 * ensure that the export flags agree with the flags on each
470 static void fix_pseudoflavor_flags(struct exportent *ep)
472 struct export_features *ef;
475 ef = get_export_features();
476 for (p = ep->e_secinfo; p->flav; p++)
477 p->flags |= ep->e_flags & ~ef->secinfo_flags;
481 * Parse option string pointed to by cp and set mount options accordingly.
484 parseopts(char *cp, struct exportent *ep, int warn, int *had_subtree_opt_ptr)
486 int had_subtree_opt = 0;
487 char *flname = efname?efname:"command line";
488 int flline = efp?efp->x_line:0;
489 unsigned int active = 0;
491 squids = ep->e_squids; nsquids = ep->e_nsquids;
492 sqgids = ep->e_sqgids; nsqgids = ep->e_nsqgids;
500 char *opt = strdup(cp);
502 while (*cp && *cp != ',')
505 opt[cp-optstart] = '\0';
509 /* process keyword */
510 if (strcmp(opt, "ro") == 0)
511 setflags(NFSEXP_READONLY, active, ep);
512 else if (strcmp(opt, "rw") == 0)
513 clearflags(NFSEXP_READONLY, active, ep);
514 else if (!strcmp(opt, "secure"))
515 clearflags(NFSEXP_INSECURE_PORT, active, ep);
516 else if (!strcmp(opt, "insecure"))
517 setflags(NFSEXP_INSECURE_PORT, active, ep);
518 else if (!strcmp(opt, "sync"))
519 clearflags(NFSEXP_ASYNC, active, ep);
520 else if (!strcmp(opt, "async"))
521 setflags(NFSEXP_ASYNC, active, ep);
522 else if (!strcmp(opt, "nohide"))
523 setflags(NFSEXP_NOHIDE, active, ep);
524 else if (!strcmp(opt, "hide"))
525 clearflags(NFSEXP_NOHIDE, active, ep);
526 else if (!strcmp(opt, "crossmnt"))
527 setflags(NFSEXP_CROSSMOUNT, active, ep);
528 else if (!strcmp(opt, "nocrossmnt"))
529 clearflags(NFSEXP_CROSSMOUNT, active, ep);
530 else if (!strcmp(opt, "wdelay"))
531 setflags(NFSEXP_GATHERED_WRITES, active, ep);
532 else if (!strcmp(opt, "no_wdelay"))
533 clearflags(NFSEXP_GATHERED_WRITES, active, ep);
534 else if (strcmp(opt, "root_squash") == 0)
535 setflags(NFSEXP_ROOTSQUASH, active, ep);
536 else if (!strcmp(opt, "no_root_squash"))
537 clearflags(NFSEXP_ROOTSQUASH, active, ep);
538 else if (strcmp(opt, "all_squash") == 0)
539 setflags(NFSEXP_ALLSQUASH, active, ep);
540 else if (strcmp(opt, "no_all_squash") == 0)
541 clearflags(NFSEXP_ALLSQUASH, active, ep);
542 else if (strcmp(opt, "subtree_check") == 0) {
544 clearflags(NFSEXP_NOSUBTREECHECK, active, ep);
545 } else if (strcmp(opt, "no_subtree_check") == 0) {
547 setflags(NFSEXP_NOSUBTREECHECK, active, ep);
548 } else if (strcmp(opt, "auth_nlm") == 0)
549 clearflags(NFSEXP_NOAUTHNLM, active, ep);
550 else if (strcmp(opt, "no_auth_nlm") == 0)
551 setflags(NFSEXP_NOAUTHNLM, active, ep);
552 else if (strcmp(opt, "secure_locks") == 0)
553 clearflags(NFSEXP_NOAUTHNLM, active, ep);
554 else if (strcmp(opt, "insecure_locks") == 0)
555 setflags(NFSEXP_NOAUTHNLM, active, ep);
556 else if (strcmp(opt, "acl") == 0)
557 clearflags(NFSEXP_NOACL, active, ep);
558 else if (strcmp(opt, "no_acl") == 0)
559 setflags(NFSEXP_NOACL, active, ep);
560 else if (strncmp(opt, "anonuid=", 8) == 0) {
562 ep->e_anonuid = strtol(opt+8, &oe, 10);
563 if (opt[8]=='\0' || *oe != '\0') {
564 xlog(L_ERROR, "%s: %d: bad anonuid \"%s\"\n",
565 flname, flline, opt);
568 export_errno = EINVAL;
571 } else if (strncmp(opt, "anongid=", 8) == 0) {
573 ep->e_anongid = strtol(opt+8, &oe, 10);
574 if (opt[8]=='\0' || *oe != '\0') {
575 xlog(L_ERROR, "%s: %d: bad anongid \"%s\"\n",
576 flname, flline, opt);
579 } else if (strncmp(opt, "squash_uids=", 12) == 0) {
580 if (parsesquash(opt+12, &squids, &nsquids, &cp) < 0) {
583 } else if (strncmp(opt, "squash_gids=", 12) == 0) {
584 if (parsesquash(opt+12, &sqgids, &nsqgids, &cp) < 0) {
587 } else if (strncmp(opt, "fsid=", 5) == 0) {
589 if (strcmp(opt+5, "root") == 0) {
591 setflags(NFSEXP_FSID, active, ep);
593 ep->e_fsid = strtoul(opt+5, &oe, 0);
594 if (opt[5]!='\0' && *oe == '\0')
595 setflags(NFSEXP_FSID, active, ep);
596 else if (valid_uuid(opt+5))
597 ep->e_uuid = strdup(opt+5);
599 xlog(L_ERROR, "%s: %d: bad fsid \"%s\"\n",
600 flname, flline, opt);
604 } else if (strcmp(opt, "mountpoint")==0 ||
605 strcmp(opt, "mp") == 0 ||
606 strncmp(opt, "mountpoint=", 11)==0 ||
607 strncmp(opt, "mp=", 3) == 0) {
608 char * mp = strchr(opt, '=');
610 ep->e_mountpoint = strdup(mp+1);
612 ep->e_mountpoint = strdup("");
614 } else if (strncmp(opt, "fsloc=", 6) == 0) {
615 if (strcmp(opt+6, "stub") == 0)
616 ep->e_fslocmethod = FSLOC_STUB;
618 xlog(L_ERROR, "%s:%d: bad option %s\n",
619 flname, flline, opt);
623 } else if (strncmp(opt, "refer=", 6) == 0) {
624 ep->e_fslocmethod = FSLOC_REFER;
625 ep->e_fslocdata = strdup(opt+6);
626 } else if (strncmp(opt, "replicas=", 9) == 0) {
627 ep->e_fslocmethod = FSLOC_REPLICA;
628 ep->e_fslocdata = strdup(opt+9);
629 } else if (strncmp(opt, "sec=", 4) == 0) {
630 active = parse_flavors(opt+4, ep);
634 xlog(L_ERROR, "%s:%d: unknown keyword \"%s\"\n",
635 flname, flline, opt);
636 setflags(NFSEXP_ALLSQUASH | NFSEXP_READONLY, active, ep);
644 fix_pseudoflavor_flags(ep);
645 ep->e_squids = squids;
646 ep->e_sqgids = sqgids;
647 ep->e_nsquids = nsquids;
648 ep->e_nsqgids = nsqgids;
651 if (warn && !had_subtree_opt)
652 xlog(L_WARNING, "%s [%d]: Neither 'subtree_check' or 'no_subtree_check' specified for export \"%s:%s\".\n"
653 " Assuming default behaviour ('no_subtree_check').\n"
654 " NOTE: this default has changed since nfs-utils version 1.0.x\n",
657 ep->e_hostname, ep->e_path);
658 if (had_subtree_opt_ptr)
659 *had_subtree_opt_ptr = had_subtree_opt;
665 parsesquash(char *list, int **idp, int *lenp, char **ep)
683 if (id0 == -1 || id1 == -1) {
684 syntaxerr("uid/gid -1 not permitted");
688 id = (int *) xrealloc(id, (len + 8) * sizeof(*id));
691 if (!*cp || *cp == ')' || (*cp == ',' && !isdigit(cp[1])))
694 syntaxerr("bad uid/gid list");
700 if (**ep == ',') (*ep)++;
730 while (isdigit(**cpp))
732 c = **cpp; **cpp = '\0'; num = atoi(cp); **cpp = c;
737 getpath(char *path, int len)
740 return xgettok(efp, 0, path, len);
744 getexport(char *exp, int len)
749 if ((ok = xgettok(efp, 0, exp, len)) < 0)
750 xlog(L_ERROR, "%s:%d: syntax error",
751 efname?"command line":efname, efp->x_line);
758 xlog(L_ERROR, "%s:%d: syntax error: %s",
759 efname, efp?efp->x_line:0, msg);
761 struct export_features *get_export_features(void)
763 static char *path = "/proc/fs/nfsd/export_features";
764 static struct export_features ef;
765 static int cached = 0;
773 ef.flags = NFSEXP_OLDFLAGS;
774 ef.secinfo_flags = NFSEXP_OLD_SECINFO_FLAGS;
776 fd = open(path, O_RDONLY);
779 fd = read(fd, buf, 50);
782 c = sscanf(buf, "%x %x", &ef.flags, &ef.secinfo_flags);
789 xlog(L_WARNING, "unexpected error reading %s", path);