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>
34 #define EXPORT_DEFAULT_FLAGS \
35 (NFSEXP_READONLY|NFSEXP_ROOTSQUASH|NFSEXP_GATHERED_WRITES)
39 static char *efname = NULL;
40 static XFILE *efp = NULL;
42 static int has_default_opts, has_default_subtree_opts;
43 static int *squids = NULL, nsquids = 0,
44 *sqgids = NULL, nsqgids = 0;
46 static int getexport(char *exp, int len);
47 static int getpath(char *path, int len);
48 static int parseopts(char *cp, struct exportent *ep, int warn, int *had_subtree_opt_ptr);
49 static int parsesquash(char *list, int **idp, int *lenp, char **ep);
50 static int parsenum(char **cpp);
51 static int parsemaptype(char *type);
52 static void freesquash(void);
53 static void syntaxerr(char *msg);
56 setexportent(char *fname, char *type)
61 fname = _PATH_EXPORTS;
62 if (!(efp = xfopen(fname, type)))
63 xlog(L_ERROR, "can't open %s for %sing",
64 fname, strcmp(type, "r")? "writ" : "read");
65 efname = strdup(fname);
70 getexportent(int fromkernel, int fromexports)
72 static struct exportent ee, def_ee;
73 char exp[512], *hostname;
74 char rpath[MAXPATHLEN+1];
83 if (first || (ok = getexport(exp, sizeof(exp))) == 0) {
85 has_default_subtree_opts = 0;
87 def_ee.e_flags = EXPORT_DEFAULT_FLAGS;
88 /* some kernels assume the default is sync rather than
89 * async. More recent kernels always report one or other,
90 * but this test makes sure we assume same as kernel
94 def_ee.e_flags &= ~NFSEXP_ASYNC;
95 def_ee.e_flags &= ~NFSEXP_GATHERED_WRITES;
97 def_ee.e_maptype = CLE_MAP_IDENT;
98 def_ee.e_anonuid = 65534;
99 def_ee.e_anongid = 65534;
100 def_ee.e_squids = NULL;
101 def_ee.e_sqgids = NULL;
102 def_ee.e_mountpoint = NULL;
103 def_ee.e_fslocmethod = FSLOC_NONE;
104 def_ee.e_fslocdata = NULL;
105 def_ee.e_nsquids = 0;
106 def_ee.e_nsqgids = 0;
108 ok = getpath(def_ee.e_path, sizeof(def_ee.e_path));
112 strncpy (def_ee.m_path, def_ee.e_path, sizeof (def_ee.m_path) - 1);
113 def_ee.m_path [sizeof (def_ee.m_path) - 1] = '\0';
114 ok = getexport(exp, sizeof(exp));
117 xlog(L_ERROR, "expected client(options...)");
118 export_errno = EINVAL;
123 /* Check for default options */
125 if (parseopts(exp + 1, &def_ee, 0, &has_default_subtree_opts) < 0)
128 has_default_opts = 1;
130 ok = getexport(exp, sizeof(exp));
132 xlog(L_ERROR, "expected client(options...)");
133 export_errno = EINVAL;
140 /* Check for default client */
145 if ((opt = strchr(exp, '(')) != NULL) {
147 xlog(L_WARNING, "No host name given with %s %s, suggest *%s to avoid warning", ee.e_path, exp, exp);
151 if (!(sp = strchr(opt, ')')) || sp[1] != '\0') {
152 syntaxerr("bad option list");
153 export_errno = EINVAL;
158 if (!has_default_opts)
159 xlog(L_WARNING, "No options for %s %s: suggest %s(sync) to avoid warning", ee.e_path, exp, exp);
161 if (strlen(hostname) >= sizeof(ee.e_hostname)) {
162 syntaxerr("client name too long");
163 export_errno = EINVAL;
166 strncpy(ee.e_hostname, hostname, sizeof (ee.e_hostname) - 1);
167 ee.e_hostname[sizeof (ee.e_hostname) - 1] = '\0';
169 if (parseopts(opt, &ee, fromexports && !has_default_subtree_opts, NULL) < 0)
172 /* resolve symlinks */
173 if (realpath(ee.e_path, rpath) != NULL) {
174 rpath[sizeof (rpath) - 1] = '\0';
175 strncpy(ee.e_path, rpath, sizeof (ee.e_path) - 1);
176 ee.e_path[sizeof (ee.e_path) - 1] = '\0';
177 strncpy (ee.m_path, ee.e_path, sizeof (ee.m_path) - 1);
178 ee.m_path [sizeof (ee.m_path) - 1] = '\0';
185 putexportent(struct exportent *ep)
189 char *esc=ep->e_path;
195 for (i=0; esc[i]; i++)
196 if (iscntrl(esc[i]) || esc[i] == '"' || esc[i] == '\\' || esc[i] == '#' || isspace(esc[i]))
197 fprintf(fp, "\\%03o", esc[i]);
199 fprintf(fp, "%c", esc[i]);
201 fprintf(fp, "\t%s(", ep->e_hostname);
202 fprintf(fp, "%s,", (ep->e_flags & NFSEXP_READONLY)? "ro" : "rw");
203 fprintf(fp, "%ssync,", (ep->e_flags & NFSEXP_ASYNC)? "a" : "");
204 fprintf(fp, "%swdelay,", (ep->e_flags & NFSEXP_GATHERED_WRITES)?
206 fprintf(fp, "%shide,", (ep->e_flags & NFSEXP_NOHIDE)?
208 fprintf(fp, "%scrossmnt,", (ep->e_flags & NFSEXP_CROSSMOUNT)?
210 fprintf(fp, "%ssecure,", (ep->e_flags & NFSEXP_INSECURE_PORT)?
212 fprintf(fp, "%sroot_squash,", (ep->e_flags & NFSEXP_ROOTSQUASH)?
214 fprintf(fp, "%sall_squash,", (ep->e_flags & NFSEXP_ALLSQUASH)?
216 fprintf(fp, "%ssubtree_check,", (ep->e_flags & NFSEXP_NOSUBTREECHECK)?
218 fprintf(fp, "%ssecure_locks,", (ep->e_flags & NFSEXP_NOAUTHNLM)?
220 fprintf(fp, "%sacl,", (ep->e_flags & NFSEXP_NOACL)?
222 if (ep->e_flags & NFSEXP_FSID) {
223 fprintf(fp, "fsid=%d,", ep->e_fsid);
226 fprintf(fp, "fsid=%s,", ep->e_uuid);
227 if (ep->e_mountpoint)
228 fprintf(fp, "mountpoint%s%s,",
229 ep->e_mountpoint[0]?"=":"", ep->e_mountpoint);
230 switch (ep->e_fslocmethod) {
234 fprintf(fp, "refer=%s,", ep->e_fslocdata);
237 fprintf(fp, "replicas=%s,", ep->e_fslocdata);
241 fprintf(fp, "fsloc=stub,");
245 xlog(L_ERROR, "unknown fsloc method for %s:%s",
246 ep->e_hostname, ep->e_path);
248 fprintf(fp, "mapping=");
249 switch (ep->e_maptype) {
251 fprintf(fp, "identity,");
254 fprintf(fp, "ugidd,");
257 fprintf(fp, "file,");
260 xlog(L_ERROR, "unknown mapping type for %s:%s",
261 ep->e_hostname, ep->e_path);
263 if ((id = ep->e_squids) != NULL) {
264 fprintf(fp, "squash_uids=");
265 for (i = 0; i < ep->e_nsquids; i += 2)
266 if (id[i] != id[i+1])
267 fprintf(fp, "%d-%d,", id[i], id[i+1]);
269 fprintf(fp, "%d,", id[i]);
271 if ((id = ep->e_sqgids) != NULL) {
272 fprintf(fp, "squash_gids=");
273 for (i = 0; i < ep->e_nsquids; i += 2)
274 if (id[i] != id[i+1])
275 fprintf(fp, "%d-%d,", id[i], id[i+1]);
277 fprintf(fp, "%d,", id[i]);
279 fprintf(fp, "anonuid=%d,anongid=%d)\n", ep->e_anonuid, ep->e_anongid);
295 dupexportent(struct exportent *dst, struct exportent *src)
300 if ((n = src->e_nsquids) != 0) {
301 dst->e_squids = (int *) xmalloc(n * sizeof(int));
302 memcpy(dst->e_squids, src->e_squids, n * sizeof(int));
304 if ((n = src->e_nsqgids) != 0) {
305 dst->e_sqgids = (int *) xmalloc(n * sizeof(int));
306 memcpy(dst->e_sqgids, src->e_sqgids, n * sizeof(int));
308 if (src->e_mountpoint)
309 dst->e_mountpoint = strdup(src->e_mountpoint);
310 if (src->e_fslocdata)
311 dst->e_fslocdata = strdup(src->e_fslocdata);
315 mkexportent(char *hname, char *path, char *options)
317 static struct exportent ee;
319 ee.e_flags = EXPORT_DEFAULT_FLAGS;
320 ee.e_maptype = CLE_MAP_IDENT;
321 ee.e_anonuid = 65534;
322 ee.e_anongid = 65534;
325 ee.e_mountpoint = NULL;
326 ee.e_fslocmethod = FSLOC_NONE;
327 ee.e_fslocdata = NULL;
332 if (strlen(hname) >= sizeof(ee.e_hostname)) {
333 xlog(L_WARNING, "client name %s too long", hname);
336 strncpy(ee.e_hostname, hname, sizeof (ee.e_hostname) - 1);
337 ee.e_hostname[sizeof (ee.e_hostname) - 1] = '\0';
338 if (strlen(path) >= sizeof(ee.e_path)) {
339 xlog(L_WARNING, "path name %s too long", path);
342 strncpy(ee.e_path, path, sizeof (ee.e_path));
343 ee.e_path[sizeof (ee.e_path) - 1] = '\0';
344 strncpy (ee.m_path, ee.e_path, sizeof (ee.m_path) - 1);
345 ee.m_path [sizeof (ee.m_path) - 1] = '\0';
346 if (parseopts(options, &ee, 0, NULL) < 0)
352 updateexportent(struct exportent *eep, char *options)
354 if (parseopts(options, eep, 0, NULL) < 0)
360 static int valid_uuid(char *uuid)
362 /* must have 32 hex digits */
364 for (cnt = 0 ; *uuid; uuid++)
371 * Parse option string pointed to by cp and set mount options accordingly.
374 parseopts(char *cp, struct exportent *ep, int warn, int *had_subtree_opt_ptr)
376 int had_subtree_opt = 0;
377 char *flname = efname?efname:"command line";
378 int flline = efp?efp->x_line:0;
380 squids = ep->e_squids; nsquids = ep->e_nsquids;
381 sqgids = ep->e_sqgids; nsqgids = ep->e_nsqgids;
390 char *opt = strdup(cp);
392 while (*cp && *cp != ',')
395 opt[cp-optstart] = '\0';
399 /* process keyword */
400 if (strcmp(opt, "ro") == 0)
401 ep->e_flags |= NFSEXP_READONLY;
402 else if (strcmp(opt, "rw") == 0)
403 ep->e_flags &= ~NFSEXP_READONLY;
404 else if (!strcmp(opt, "secure"))
405 ep->e_flags &= ~NFSEXP_INSECURE_PORT;
406 else if (!strcmp(opt, "insecure"))
407 ep->e_flags |= NFSEXP_INSECURE_PORT;
408 else if (!strcmp(opt, "sync"))
409 ep->e_flags &= ~NFSEXP_ASYNC;
410 else if (!strcmp(opt, "async"))
411 ep->e_flags |= NFSEXP_ASYNC;
412 else if (!strcmp(opt, "nohide"))
413 ep->e_flags |= NFSEXP_NOHIDE;
414 else if (!strcmp(opt, "hide"))
415 ep->e_flags &= ~NFSEXP_NOHIDE;
416 else if (!strcmp(opt, "crossmnt"))
417 ep->e_flags |= NFSEXP_CROSSMOUNT;
418 else if (!strcmp(opt, "nocrossmnt"))
419 ep->e_flags &= ~NFSEXP_CROSSMOUNT;
420 else if (!strcmp(opt, "wdelay"))
421 ep->e_flags |= NFSEXP_GATHERED_WRITES;
422 else if (!strcmp(opt, "no_wdelay"))
423 ep->e_flags &= ~NFSEXP_GATHERED_WRITES;
424 else if (strcmp(opt, "root_squash") == 0)
425 ep->e_flags |= NFSEXP_ROOTSQUASH;
426 else if (!strcmp(opt, "no_root_squash"))
427 ep->e_flags &= ~NFSEXP_ROOTSQUASH;
428 else if (strcmp(opt, "all_squash") == 0)
429 ep->e_flags |= NFSEXP_ALLSQUASH;
430 else if (strcmp(opt, "no_all_squash") == 0)
431 ep->e_flags &= ~NFSEXP_ALLSQUASH;
432 else if (strcmp(opt, "subtree_check") == 0) {
434 ep->e_flags &= ~NFSEXP_NOSUBTREECHECK;
435 } else if (strcmp(opt, "no_subtree_check") == 0) {
437 ep->e_flags |= NFSEXP_NOSUBTREECHECK;
438 } else if (strcmp(opt, "auth_nlm") == 0)
439 ep->e_flags &= ~NFSEXP_NOAUTHNLM;
440 else if (strcmp(opt, "no_auth_nlm") == 0)
441 ep->e_flags |= NFSEXP_NOAUTHNLM;
442 else if (strcmp(opt, "secure_locks") == 0)
443 ep->e_flags &= ~NFSEXP_NOAUTHNLM;
444 else if (strcmp(opt, "insecure_locks") == 0)
445 ep->e_flags |= NFSEXP_NOAUTHNLM;
446 else if (strcmp(opt, "acl") == 0)
447 ep->e_flags &= ~NFSEXP_NOACL;
448 else if (strcmp(opt, "no_acl") == 0)
449 ep->e_flags |= NFSEXP_NOACL;
450 else if (strncmp(opt, "mapping=", 8) == 0)
451 ep->e_maptype = parsemaptype(opt+8);
452 else if (strcmp(opt, "map_identity") == 0) /* old style */
453 ep->e_maptype = CLE_MAP_IDENT;
454 else if (strcmp(opt, "map_daemon") == 0) /* old style */
455 ep->e_maptype = CLE_MAP_UGIDD;
456 else if (strncmp(opt, "anonuid=", 8) == 0) {
458 ep->e_anonuid = strtol(opt+8, &oe, 10);
459 if (opt[8]=='\0' || *oe != '\0') {
460 xlog(L_ERROR, "%s: %d: bad anonuid \"%s\"\n",
461 flname, flline, opt);
464 export_errno = EINVAL;
467 } else if (strncmp(opt, "anongid=", 8) == 0) {
469 ep->e_anongid = strtol(opt+8, &oe, 10);
470 if (opt[8]=='\0' || *oe != '\0') {
471 xlog(L_ERROR, "%s: %d: bad anongid \"%s\"\n",
472 flname, flline, opt);
475 } else if (strncmp(opt, "squash_uids=", 12) == 0) {
476 if (parsesquash(opt+12, &squids, &nsquids, &cp) < 0) {
479 } else if (strncmp(opt, "squash_gids=", 12) == 0) {
480 if (parsesquash(opt+12, &sqgids, &nsqgids, &cp) < 0) {
483 } else if (strncmp(opt, "fsid=", 5) == 0) {
485 if (strcmp(opt+5, "root") == 0) {
487 ep->e_flags |= NFSEXP_FSID;
489 ep->e_fsid = strtoul(opt+5, &oe, 0);
490 if (opt[5]!='\0' && *oe == '\0')
491 ep->e_flags |= NFSEXP_FSID;
492 else if (valid_uuid(opt+5))
493 ep->e_uuid = strdup(opt+7);
495 xlog(L_ERROR, "%s: %d: bad fsid \"%s\"\n",
496 flname, flline, opt);
500 } else if (strcmp(opt, "mountpoint")==0 ||
501 strcmp(opt, "mp") == 0 ||
502 strncmp(opt, "mountpoint=", 11)==0 ||
503 strncmp(opt, "mp=", 3) == 0) {
504 char * mp = strchr(opt, '=');
506 ep->e_mountpoint = strdup(mp+1);
508 ep->e_mountpoint = strdup("");
510 } else if (strncmp(opt, "fsloc=", 6) == 0) {
511 if (strcmp(opt+6, "stub") == 0)
512 ep->e_fslocmethod = FSLOC_STUB;
514 xlog(L_ERROR, "%s:%d: bad option %s\n",
515 flname, flline, opt);
519 } else if (strncmp(opt, "refer=", 6) == 0) {
520 ep->e_fslocmethod = FSLOC_REFER;
521 ep->e_fslocdata = strdup(opt+6);
522 } else if (strncmp(opt, "replicas=", 9) == 0) {
523 ep->e_fslocmethod = FSLOC_REPLICA;
524 ep->e_fslocdata = strdup(opt+9);
526 xlog(L_ERROR, "%s:%d: unknown keyword \"%s\"\n",
527 flname, flline, opt);
528 ep->e_flags |= NFSEXP_ALLSQUASH | NFSEXP_READONLY;
536 ep->e_squids = squids;
537 ep->e_sqgids = sqgids;
538 ep->e_nsquids = nsquids;
539 ep->e_nsqgids = nsqgids;
542 if (warn && !had_subtree_opt)
543 xlog(L_WARNING, "%s [%d]: Neither 'subtree_check' or 'no_subtree_check' specified for export \"%s:%s\".\n"
544 " Assuming default behaviour ('subtree_check').\n"
545 " NOTE: this default will change with nfs-utils version 1.1.0\n",
548 ep->e_hostname, ep->e_path);
549 if (had_subtree_opt_ptr)
550 *had_subtree_opt_ptr = had_subtree_opt;
556 parsesquash(char *list, int **idp, int *lenp, char **ep)
574 if (id0 == -1 || id1 == -1) {
575 syntaxerr("uid/gid -1 not permitted");
579 id = (int *) xrealloc(id, (len + 8) * sizeof(*id));
582 if (!*cp || *cp == ')' || (*cp == ',' && !isdigit(cp[1])))
585 syntaxerr("bad uid/gid list");
591 if (**ep == ',') (*ep)++;
621 while (isdigit(**cpp))
623 c = **cpp; **cpp = '\0'; num = atoi(cp); **cpp = c;
628 parsemaptype(char *type)
630 if (!strcmp(type, "identity"))
631 return CLE_MAP_IDENT;
632 if (!strcmp(type, "ugidd"))
633 return CLE_MAP_UGIDD;
634 if (!strcmp(type, "file"))
636 syntaxerr("invalid map type");
637 return CLE_MAP_IDENT; /* default */
641 getpath(char *path, int len)
644 return xgettok(efp, 0, path, len);
648 getexport(char *exp, int len)
653 if ((ok = xgettok(efp, 0, exp, len)) < 0)
654 xlog(L_ERROR, "%s:%d: syntax error",
655 efname?"command line":efname, efp->x_line);
662 xlog(L_ERROR, "%s:%d: syntax error: %s",
663 efname, efp?efp->x_line:0, msg);