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|NFSEXP_NOSUBTREECHECK)
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 void freesquash(void);
52 static void syntaxerr(char *msg);
55 setexportent(char *fname, char *type)
60 fname = _PATH_EXPORTS;
61 if (!(efp = xfopen(fname, type)))
62 xlog(L_ERROR, "can't open %s for %sing",
63 fname, strcmp(type, "r")? "writ" : "read");
64 efname = strdup(fname);
69 getexportent(int fromkernel, int fromexports)
71 static struct exportent ee, def_ee;
72 char exp[512], *hostname;
73 char rpath[MAXPATHLEN+1];
82 if (first || (ok = getexport(exp, sizeof(exp))) == 0) {
84 has_default_subtree_opts = 0;
86 def_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 def_ee.e_flags &= ~NFSEXP_ASYNC;
94 def_ee.e_flags &= ~NFSEXP_GATHERED_WRITES;
96 def_ee.e_anonuid = 65534;
97 def_ee.e_anongid = 65534;
98 def_ee.e_squids = NULL;
99 def_ee.e_sqgids = NULL;
100 def_ee.e_mountpoint = NULL;
101 def_ee.e_fslocmethod = FSLOC_NONE;
102 def_ee.e_fslocdata = NULL;
103 def_ee.e_nsquids = 0;
104 def_ee.e_nsqgids = 0;
106 ok = getpath(def_ee.e_path, sizeof(def_ee.e_path));
110 strncpy (def_ee.m_path, def_ee.e_path, sizeof (def_ee.m_path) - 1);
111 def_ee.m_path [sizeof (def_ee.m_path) - 1] = '\0';
112 ok = getexport(exp, sizeof(exp));
115 xlog(L_ERROR, "expected client(options...)");
116 export_errno = EINVAL;
121 /* Check for default options */
123 if (parseopts(exp + 1, &def_ee, 0, &has_default_subtree_opts) < 0)
126 has_default_opts = 1;
128 ok = getexport(exp, sizeof(exp));
130 xlog(L_ERROR, "expected client(options...)");
131 export_errno = EINVAL;
138 /* Check for default client */
143 if ((opt = strchr(exp, '(')) != NULL) {
145 xlog(L_WARNING, "No host name given with %s %s, suggest *%s to avoid warning", ee.e_path, exp, exp);
149 if (!(sp = strchr(opt, ')')) || sp[1] != '\0') {
150 syntaxerr("bad option list");
151 export_errno = EINVAL;
156 if (!has_default_opts)
157 xlog(L_WARNING, "No options for %s %s: suggest %s(sync) to avoid warning", ee.e_path, exp, exp);
159 if (strlen(hostname) >= sizeof(ee.e_hostname)) {
160 syntaxerr("client name too long");
161 export_errno = EINVAL;
164 strncpy(ee.e_hostname, hostname, sizeof (ee.e_hostname) - 1);
165 ee.e_hostname[sizeof (ee.e_hostname) - 1] = '\0';
167 if (parseopts(opt, &ee, fromexports && !has_default_subtree_opts, NULL) < 0)
170 /* resolve symlinks */
171 if (realpath(ee.e_path, rpath) != NULL) {
172 rpath[sizeof (rpath) - 1] = '\0';
173 strncpy(ee.e_path, rpath, sizeof (ee.e_path) - 1);
174 ee.e_path[sizeof (ee.e_path) - 1] = '\0';
175 strncpy (ee.m_path, ee.e_path, sizeof (ee.m_path) - 1);
176 ee.m_path [sizeof (ee.m_path) - 1] = '\0';
183 putexportent(struct exportent *ep)
187 char *esc=ep->e_path;
193 for (i=0; esc[i]; i++)
194 if (iscntrl(esc[i]) || esc[i] == '"' || esc[i] == '\\' || esc[i] == '#' || isspace(esc[i]))
195 fprintf(fp, "\\%03o", esc[i]);
197 fprintf(fp, "%c", esc[i]);
199 fprintf(fp, "\t%s(", ep->e_hostname);
200 fprintf(fp, "%s,", (ep->e_flags & NFSEXP_READONLY)? "ro" : "rw");
201 fprintf(fp, "%ssync,", (ep->e_flags & NFSEXP_ASYNC)? "a" : "");
202 fprintf(fp, "%swdelay,", (ep->e_flags & NFSEXP_GATHERED_WRITES)?
204 fprintf(fp, "%shide,", (ep->e_flags & NFSEXP_NOHIDE)?
206 fprintf(fp, "%scrossmnt,", (ep->e_flags & NFSEXP_CROSSMOUNT)?
208 fprintf(fp, "%ssecure,", (ep->e_flags & NFSEXP_INSECURE_PORT)?
210 fprintf(fp, "%sroot_squash,", (ep->e_flags & NFSEXP_ROOTSQUASH)?
212 fprintf(fp, "%sall_squash,", (ep->e_flags & NFSEXP_ALLSQUASH)?
214 fprintf(fp, "%ssubtree_check,", (ep->e_flags & NFSEXP_NOSUBTREECHECK)?
216 fprintf(fp, "%ssecure_locks,", (ep->e_flags & NFSEXP_NOAUTHNLM)?
218 fprintf(fp, "%sacl,", (ep->e_flags & NFSEXP_NOACL)?
220 if (ep->e_flags & NFSEXP_FSID) {
221 fprintf(fp, "fsid=%d,", ep->e_fsid);
224 fprintf(fp, "fsid=%s,", ep->e_uuid);
225 if (ep->e_mountpoint)
226 fprintf(fp, "mountpoint%s%s,",
227 ep->e_mountpoint[0]?"=":"", ep->e_mountpoint);
228 switch (ep->e_fslocmethod) {
232 fprintf(fp, "refer=%s,", ep->e_fslocdata);
235 fprintf(fp, "replicas=%s,", ep->e_fslocdata);
239 fprintf(fp, "fsloc=stub,");
243 xlog(L_ERROR, "unknown fsloc method for %s:%s",
244 ep->e_hostname, ep->e_path);
246 if ((id = ep->e_squids) != NULL) {
247 fprintf(fp, "squash_uids=");
248 for (i = 0; i < ep->e_nsquids; i += 2)
249 if (id[i] != id[i+1])
250 fprintf(fp, "%d-%d,", id[i], id[i+1]);
252 fprintf(fp, "%d,", id[i]);
254 if ((id = ep->e_sqgids) != NULL) {
255 fprintf(fp, "squash_gids=");
256 for (i = 0; i < ep->e_nsquids; i += 2)
257 if (id[i] != id[i+1])
258 fprintf(fp, "%d-%d,", id[i], id[i+1]);
260 fprintf(fp, "%d,", id[i]);
262 fprintf(fp, "anonuid=%d,anongid=%d)\n", ep->e_anonuid, ep->e_anongid);
278 dupexportent(struct exportent *dst, struct exportent *src)
283 if ((n = src->e_nsquids) != 0) {
284 dst->e_squids = (int *) xmalloc(n * sizeof(int));
285 memcpy(dst->e_squids, src->e_squids, n * sizeof(int));
287 if ((n = src->e_nsqgids) != 0) {
288 dst->e_sqgids = (int *) xmalloc(n * sizeof(int));
289 memcpy(dst->e_sqgids, src->e_sqgids, n * sizeof(int));
291 if (src->e_mountpoint)
292 dst->e_mountpoint = strdup(src->e_mountpoint);
293 if (src->e_fslocdata)
294 dst->e_fslocdata = strdup(src->e_fslocdata);
298 mkexportent(char *hname, char *path, char *options)
300 static struct exportent ee;
302 ee.e_flags = EXPORT_DEFAULT_FLAGS;
303 ee.e_anonuid = 65534;
304 ee.e_anongid = 65534;
307 ee.e_mountpoint = NULL;
308 ee.e_fslocmethod = FSLOC_NONE;
309 ee.e_fslocdata = NULL;
314 if (strlen(hname) >= sizeof(ee.e_hostname)) {
315 xlog(L_WARNING, "client name %s too long", hname);
318 strncpy(ee.e_hostname, hname, sizeof (ee.e_hostname) - 1);
319 ee.e_hostname[sizeof (ee.e_hostname) - 1] = '\0';
320 if (strlen(path) >= sizeof(ee.e_path)) {
321 xlog(L_WARNING, "path name %s too long", path);
324 strncpy(ee.e_path, path, sizeof (ee.e_path));
325 ee.e_path[sizeof (ee.e_path) - 1] = '\0';
326 strncpy (ee.m_path, ee.e_path, sizeof (ee.m_path) - 1);
327 ee.m_path [sizeof (ee.m_path) - 1] = '\0';
328 if (parseopts(options, &ee, 0, NULL) < 0)
334 updateexportent(struct exportent *eep, char *options)
336 if (parseopts(options, eep, 0, NULL) < 0)
342 static int valid_uuid(char *uuid)
344 /* must have 32 hex digits */
346 for (cnt = 0 ; *uuid; uuid++)
353 * Parse option string pointed to by cp and set mount options accordingly.
356 parseopts(char *cp, struct exportent *ep, int warn, int *had_subtree_opt_ptr)
358 int had_subtree_opt = 0;
359 char *flname = efname?efname:"command line";
360 int flline = efp?efp->x_line:0;
362 squids = ep->e_squids; nsquids = ep->e_nsquids;
363 sqgids = ep->e_sqgids; nsqgids = ep->e_nsqgids;
372 char *opt = strdup(cp);
374 while (*cp && *cp != ',')
377 opt[cp-optstart] = '\0';
381 /* process keyword */
382 if (strcmp(opt, "ro") == 0)
383 ep->e_flags |= NFSEXP_READONLY;
384 else if (strcmp(opt, "rw") == 0)
385 ep->e_flags &= ~NFSEXP_READONLY;
386 else if (!strcmp(opt, "secure"))
387 ep->e_flags &= ~NFSEXP_INSECURE_PORT;
388 else if (!strcmp(opt, "insecure"))
389 ep->e_flags |= NFSEXP_INSECURE_PORT;
390 else if (!strcmp(opt, "sync"))
391 ep->e_flags &= ~NFSEXP_ASYNC;
392 else if (!strcmp(opt, "async"))
393 ep->e_flags |= NFSEXP_ASYNC;
394 else if (!strcmp(opt, "nohide"))
395 ep->e_flags |= NFSEXP_NOHIDE;
396 else if (!strcmp(opt, "hide"))
397 ep->e_flags &= ~NFSEXP_NOHIDE;
398 else if (!strcmp(opt, "crossmnt"))
399 ep->e_flags |= NFSEXP_CROSSMOUNT;
400 else if (!strcmp(opt, "nocrossmnt"))
401 ep->e_flags &= ~NFSEXP_CROSSMOUNT;
402 else if (!strcmp(opt, "wdelay"))
403 ep->e_flags |= NFSEXP_GATHERED_WRITES;
404 else if (!strcmp(opt, "no_wdelay"))
405 ep->e_flags &= ~NFSEXP_GATHERED_WRITES;
406 else if (strcmp(opt, "root_squash") == 0)
407 ep->e_flags |= NFSEXP_ROOTSQUASH;
408 else if (!strcmp(opt, "no_root_squash"))
409 ep->e_flags &= ~NFSEXP_ROOTSQUASH;
410 else if (strcmp(opt, "all_squash") == 0)
411 ep->e_flags |= NFSEXP_ALLSQUASH;
412 else if (strcmp(opt, "no_all_squash") == 0)
413 ep->e_flags &= ~NFSEXP_ALLSQUASH;
414 else if (strcmp(opt, "subtree_check") == 0) {
416 ep->e_flags &= ~NFSEXP_NOSUBTREECHECK;
417 } else if (strcmp(opt, "no_subtree_check") == 0) {
419 ep->e_flags |= NFSEXP_NOSUBTREECHECK;
420 } else if (strcmp(opt, "auth_nlm") == 0)
421 ep->e_flags &= ~NFSEXP_NOAUTHNLM;
422 else if (strcmp(opt, "no_auth_nlm") == 0)
423 ep->e_flags |= NFSEXP_NOAUTHNLM;
424 else if (strcmp(opt, "secure_locks") == 0)
425 ep->e_flags &= ~NFSEXP_NOAUTHNLM;
426 else if (strcmp(opt, "insecure_locks") == 0)
427 ep->e_flags |= NFSEXP_NOAUTHNLM;
428 else if (strcmp(opt, "acl") == 0)
429 ep->e_flags &= ~NFSEXP_NOACL;
430 else if (strcmp(opt, "no_acl") == 0)
431 ep->e_flags |= NFSEXP_NOACL;
432 else if (strncmp(opt, "anonuid=", 8) == 0) {
434 ep->e_anonuid = strtol(opt+8, &oe, 10);
435 if (opt[8]=='\0' || *oe != '\0') {
436 xlog(L_ERROR, "%s: %d: bad anonuid \"%s\"\n",
437 flname, flline, opt);
440 export_errno = EINVAL;
443 } else if (strncmp(opt, "anongid=", 8) == 0) {
445 ep->e_anongid = strtol(opt+8, &oe, 10);
446 if (opt[8]=='\0' || *oe != '\0') {
447 xlog(L_ERROR, "%s: %d: bad anongid \"%s\"\n",
448 flname, flline, opt);
451 } else if (strncmp(opt, "squash_uids=", 12) == 0) {
452 if (parsesquash(opt+12, &squids, &nsquids, &cp) < 0) {
455 } else if (strncmp(opt, "squash_gids=", 12) == 0) {
456 if (parsesquash(opt+12, &sqgids, &nsqgids, &cp) < 0) {
459 } else if (strncmp(opt, "fsid=", 5) == 0) {
461 if (strcmp(opt+5, "root") == 0) {
463 ep->e_flags |= NFSEXP_FSID;
465 ep->e_fsid = strtoul(opt+5, &oe, 0);
466 if (opt[5]!='\0' && *oe == '\0')
467 ep->e_flags |= NFSEXP_FSID;
468 else if (valid_uuid(opt+5))
469 ep->e_uuid = strdup(opt+7);
471 xlog(L_ERROR, "%s: %d: bad fsid \"%s\"\n",
472 flname, flline, opt);
476 } else if (strcmp(opt, "mountpoint")==0 ||
477 strcmp(opt, "mp") == 0 ||
478 strncmp(opt, "mountpoint=", 11)==0 ||
479 strncmp(opt, "mp=", 3) == 0) {
480 char * mp = strchr(opt, '=');
482 ep->e_mountpoint = strdup(mp+1);
484 ep->e_mountpoint = strdup("");
486 } else if (strncmp(opt, "fsloc=", 6) == 0) {
487 if (strcmp(opt+6, "stub") == 0)
488 ep->e_fslocmethod = FSLOC_STUB;
490 xlog(L_ERROR, "%s:%d: bad option %s\n",
491 flname, flline, opt);
495 } else if (strncmp(opt, "refer=", 6) == 0) {
496 ep->e_fslocmethod = FSLOC_REFER;
497 ep->e_fslocdata = strdup(opt+6);
498 } else if (strncmp(opt, "replicas=", 9) == 0) {
499 ep->e_fslocmethod = FSLOC_REPLICA;
500 ep->e_fslocdata = strdup(opt+9);
502 xlog(L_ERROR, "%s:%d: unknown keyword \"%s\"\n",
503 flname, flline, opt);
504 ep->e_flags |= NFSEXP_ALLSQUASH | NFSEXP_READONLY;
512 ep->e_squids = squids;
513 ep->e_sqgids = sqgids;
514 ep->e_nsquids = nsquids;
515 ep->e_nsqgids = nsqgids;
518 if (warn && !had_subtree_opt)
519 xlog(L_WARNING, "%s [%d]: Neither 'subtree_check' or 'no_subtree_check' specified for export \"%s:%s\".\n"
520 " Assuming default behaviour ('no_subtree_check').\n"
521 " NOTE: this default has changed since nfs-utils version 1.0.x\n",
524 ep->e_hostname, ep->e_path);
525 if (had_subtree_opt_ptr)
526 *had_subtree_opt_ptr = had_subtree_opt;
532 parsesquash(char *list, int **idp, int *lenp, char **ep)
550 if (id0 == -1 || id1 == -1) {
551 syntaxerr("uid/gid -1 not permitted");
555 id = (int *) xrealloc(id, (len + 8) * sizeof(*id));
558 if (!*cp || *cp == ')' || (*cp == ',' && !isdigit(cp[1])))
561 syntaxerr("bad uid/gid list");
567 if (**ep == ',') (*ep)++;
597 while (isdigit(**cpp))
599 c = **cpp; **cpp = '\0'; num = atoi(cp); **cpp = c;
604 getpath(char *path, int len)
607 return xgettok(efp, 0, path, len);
611 getexport(char *exp, int len)
616 if ((ok = xgettok(efp, 0, exp, len)) < 0)
617 xlog(L_ERROR, "%s:%d: syntax error",
618 efname?"command line":efname, efp->x_line);
625 xlog(L_ERROR, "%s:%d: syntax error: %s",
626 efname, efp?efp->x_line:0, msg);