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_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);
223 if (ep->e_mountpoint)
224 fprintf(fp, "mountpoint%s%s,",
225 ep->e_mountpoint[0]?"=":"", ep->e_mountpoint);
227 fprintf(fp, "mapping=");
228 switch (ep->e_maptype) {
230 fprintf(fp, "identity,");
233 fprintf(fp, "ugidd,");
236 fprintf(fp, "file,");
239 xlog(L_ERROR, "unknown mapping type for %s:%s",
240 ep->e_hostname, ep->e_path);
242 if ((id = ep->e_squids) != NULL) {
243 fprintf(fp, "squash_uids=");
244 for (i = 0; i < ep->e_nsquids; i += 2)
245 if (id[i] != id[i+1])
246 fprintf(fp, "%d-%d,", id[i], id[i+1]);
248 fprintf(fp, "%d,", id[i]);
250 if ((id = ep->e_sqgids) != NULL) {
251 fprintf(fp, "squash_gids=");
252 for (i = 0; i < ep->e_nsquids; i += 2)
253 if (id[i] != id[i+1])
254 fprintf(fp, "%d-%d,", id[i], id[i+1]);
256 fprintf(fp, "%d,", id[i]);
258 fprintf(fp, "anonuid=%d,anongid=%d)\n", ep->e_anonuid, ep->e_anongid);
274 dupexportent(struct exportent *dst, struct exportent *src)
279 if ((n = src->e_nsquids) != 0) {
280 dst->e_squids = (int *) xmalloc(n * sizeof(int));
281 memcpy(dst->e_squids, src->e_squids, n * sizeof(int));
283 if ((n = src->e_nsqgids) != 0) {
284 dst->e_sqgids = (int *) xmalloc(n * sizeof(int));
285 memcpy(dst->e_sqgids, src->e_sqgids, n * sizeof(int));
287 if (src->e_mountpoint)
288 dst->e_mountpoint = strdup(src->e_mountpoint);
292 mkexportent(char *hname, char *path, char *options)
294 static struct exportent ee;
296 ee.e_flags = EXPORT_DEFAULT_FLAGS;
297 ee.e_maptype = CLE_MAP_IDENT;
298 ee.e_anonuid = 65534;
299 ee.e_anongid = 65534;
302 ee.e_mountpoint = NULL;
306 if (strlen(hname) >= sizeof(ee.e_hostname)) {
307 xlog(L_WARNING, "client name %s too long", hname);
310 strncpy(ee.e_hostname, hname, sizeof (ee.e_hostname) - 1);
311 ee.e_hostname[sizeof (ee.e_hostname) - 1] = '\0';
312 if (strlen(path) >= sizeof(ee.e_path)) {
313 xlog(L_WARNING, "path name %s too long", path);
316 strncpy(ee.e_path, path, sizeof (ee.e_path));
317 ee.e_path[sizeof (ee.e_path) - 1] = '\0';
318 strncpy (ee.m_path, ee.e_path, sizeof (ee.m_path) - 1);
319 ee.m_path [sizeof (ee.m_path) - 1] = '\0';
320 if (parseopts(options, &ee, 0, NULL) < 0)
326 updateexportent(struct exportent *eep, char *options)
328 if (parseopts(options, eep, 0, NULL) < 0)
334 * Parse option string pointed to by cp and set mount options accordingly.
337 parseopts(char *cp, struct exportent *ep, int warn, int *had_subtree_opt_ptr)
339 int had_subtree_opt = 0;
340 char *flname = efname?efname:"command line";
341 int flline = efp?efp->x_line:0;
343 squids = ep->e_squids; nsquids = ep->e_nsquids;
344 sqgids = ep->e_sqgids; nsqgids = ep->e_nsqgids;
353 char *opt = strdup(cp);
355 while (*cp && *cp != ',')
358 opt[cp-optstart] = '\0';
362 /* process keyword */
363 if (strcmp(opt, "ro") == 0)
364 ep->e_flags |= NFSEXP_READONLY;
365 else if (strcmp(opt, "rw") == 0)
366 ep->e_flags &= ~NFSEXP_READONLY;
367 else if (!strcmp(opt, "secure"))
368 ep->e_flags &= ~NFSEXP_INSECURE_PORT;
369 else if (!strcmp(opt, "insecure"))
370 ep->e_flags |= NFSEXP_INSECURE_PORT;
371 else if (!strcmp(opt, "sync"))
372 ep->e_flags &= ~NFSEXP_ASYNC;
373 else if (!strcmp(opt, "async"))
374 ep->e_flags |= NFSEXP_ASYNC;
375 else if (!strcmp(opt, "nohide"))
376 ep->e_flags |= NFSEXP_NOHIDE;
377 else if (!strcmp(opt, "hide"))
378 ep->e_flags &= ~NFSEXP_NOHIDE;
379 else if (!strcmp(opt, "crossmnt"))
380 ep->e_flags |= NFSEXP_CROSSMOUNT;
381 else if (!strcmp(opt, "nocrossmnt"))
382 ep->e_flags &= ~NFSEXP_CROSSMOUNT;
383 else if (!strcmp(opt, "wdelay"))
384 ep->e_flags |= NFSEXP_GATHERED_WRITES;
385 else if (!strcmp(opt, "no_wdelay"))
386 ep->e_flags &= ~NFSEXP_GATHERED_WRITES;
387 else if (strcmp(opt, "root_squash") == 0)
388 ep->e_flags |= NFSEXP_ROOTSQUASH;
389 else if (!strcmp(opt, "no_root_squash"))
390 ep->e_flags &= ~NFSEXP_ROOTSQUASH;
391 else if (strcmp(opt, "all_squash") == 0)
392 ep->e_flags |= NFSEXP_ALLSQUASH;
393 else if (strcmp(opt, "no_all_squash") == 0)
394 ep->e_flags &= ~NFSEXP_ALLSQUASH;
395 else if (strcmp(opt, "subtree_check") == 0) {
397 ep->e_flags &= ~NFSEXP_NOSUBTREECHECK;
398 } else if (strcmp(opt, "no_subtree_check") == 0) {
400 ep->e_flags |= NFSEXP_NOSUBTREECHECK;
401 } else if (strcmp(opt, "auth_nlm") == 0)
402 ep->e_flags &= ~NFSEXP_NOAUTHNLM;
403 else if (strcmp(opt, "no_auth_nlm") == 0)
404 ep->e_flags |= NFSEXP_NOAUTHNLM;
405 else if (strcmp(opt, "secure_locks") == 0)
406 ep->e_flags &= ~NFSEXP_NOAUTHNLM;
407 else if (strcmp(opt, "insecure_locks") == 0)
408 ep->e_flags |= NFSEXP_NOAUTHNLM;
409 else if (strcmp(opt, "acl") == 0)
410 ep->e_flags &= ~NFSEXP_NOACL;
411 else if (strcmp(opt, "no_acl") == 0)
412 ep->e_flags |= NFSEXP_NOACL;
413 else if (strncmp(opt, "mapping=", 8) == 0)
414 ep->e_maptype = parsemaptype(opt+8);
415 else if (strcmp(opt, "map_identity") == 0) /* old style */
416 ep->e_maptype = CLE_MAP_IDENT;
417 else if (strcmp(opt, "map_daemon") == 0) /* old style */
418 ep->e_maptype = CLE_MAP_UGIDD;
419 else if (strncmp(opt, "anonuid=", 8) == 0) {
421 ep->e_anonuid = strtol(opt+8, &oe, 10);
422 if (opt[8]=='\0' || *oe != '\0') {
423 xlog(L_ERROR, "%s: %d: bad anonuid \"%s\"\n",
424 flname, flline, opt);
427 export_errno = EINVAL;
430 } else if (strncmp(opt, "anongid=", 8) == 0) {
432 ep->e_anongid = strtol(opt+8, &oe, 10);
433 if (opt[8]=='\0' || *oe != '\0') {
434 xlog(L_ERROR, "%s: %d: bad anongid \"%s\"\n",
435 flname, flline, opt);
438 } else if (strncmp(opt, "squash_uids=", 12) == 0) {
439 if (parsesquash(opt+12, &squids, &nsquids, &cp) < 0) {
442 } else if (strncmp(opt, "squash_gids=", 12) == 0) {
443 if (parsesquash(opt+12, &sqgids, &nsqgids, &cp) < 0) {
446 } else if (strncmp(opt, "fsid=", 5) == 0) {
448 ep->e_fsid = strtoul(opt+5, &oe, 0);
449 if (opt[5]=='\0' || *oe != '\0') {
450 xlog(L_ERROR, "%s: %d: bad fsid \"%s\"\n",
451 flname, flline, opt);
454 ep->e_flags |= NFSEXP_FSID;
455 } else if (strcmp(opt, "mountpoint")==0 ||
456 strcmp(opt, "mp") == 0 ||
457 strncmp(opt, "mountpoint=", 11)==0 ||
458 strncmp(opt, "mp=", 3) == 0) {
459 char * mp = strchr(opt, '=');
461 ep->e_mountpoint = strdup(mp+1);
463 ep->e_mountpoint = strdup("");
465 xlog(L_ERROR, "%s:%d: unknown keyword \"%s\"\n",
466 flname, flline, opt);
467 ep->e_flags |= NFSEXP_ALLSQUASH | NFSEXP_READONLY;
475 ep->e_squids = squids;
476 ep->e_sqgids = sqgids;
477 ep->e_nsquids = nsquids;
478 ep->e_nsqgids = nsqgids;
481 if (warn && !had_subtree_opt)
482 xlog(L_WARNING, "%s [%d]: Neither 'subtree_check' or 'no_subtree_check' specified for export \"%s:%s\".\n"
483 " Assuming default behaviour ('subtree_check').\n"
484 " NOTE: this default will change with nfs-utils version 1.1.0\n",
487 ep->e_hostname, ep->e_path);
488 if (had_subtree_opt_ptr)
489 *had_subtree_opt_ptr = had_subtree_opt;
495 parsesquash(char *list, int **idp, int *lenp, char **ep)
513 if (id0 == -1 || id1 == -1) {
514 syntaxerr("uid/gid -1 not permitted");
518 id = (int *) xrealloc(id, (len + 8) * sizeof(*id));
521 if (!*cp || *cp == ')' || (*cp == ',' && !isdigit(cp[1])))
524 syntaxerr("bad uid/gid list");
530 if (**ep == ',') (*ep)++;
560 while (isdigit(**cpp))
562 c = **cpp; **cpp = '\0'; num = atoi(cp); **cpp = c;
567 parsemaptype(char *type)
569 if (!strcmp(type, "identity"))
570 return CLE_MAP_IDENT;
571 if (!strcmp(type, "ugidd"))
572 return CLE_MAP_UGIDD;
573 if (!strcmp(type, "file"))
575 syntaxerr("invalid map type");
576 return CLE_MAP_IDENT; /* default */
580 getpath(char *path, int len)
583 return xgettok(efp, 0, path, len);
587 getexport(char *exp, int len)
592 if ((ok = xgettok(efp, 0, exp, len)) < 0)
593 xlog(L_ERROR, "%s:%d: syntax error",
594 efname?"command line":efname, efp->x_line);
601 xlog(L_ERROR, "%s:%d: syntax error: %s",
602 efname, efp?efp->x_line:0, msg);