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.
19 #include <sys/param.h>
32 #define EXPORT_DEFAULT_FLAGS \
33 (NFSEXP_READONLY|NFSEXP_ROOTSQUASH|NFSEXP_GATHERED_WRITES)
37 static char *efname = NULL;
38 static XFILE *efp = NULL;
40 static int *squids = NULL, nsquids = 0,
41 *sqgids = NULL, nsqgids = 0;
43 static int getexport(char *exp, int len);
44 static int getpath(char *path, int len);
45 static int parseopts(char *cp, struct exportent *ep, int warn);
46 static int parsesquash(char *list, int **idp, int *lenp, char **ep);
47 static int parsenum(char **cpp);
48 static int parsemaptype(char *type);
49 static void freesquash(void);
50 static void syntaxerr(char *msg);
53 setexportent(char *fname, char *type)
58 fname = _PATH_EXPORTS;
59 if (!(efp = xfopen(fname, type)))
60 xlog(L_ERROR, "can't open %s for %sing",
61 fname, strcmp(type, "r")? "writ" : "read");
62 efname = strdup(fname);
67 getexportent(int fromkernel, int fromexports)
69 static struct exportent ee;
70 char exp[512], *hostname;
71 char rpath[MAXPATHLEN+1];
79 ee.e_flags = EXPORT_DEFAULT_FLAGS;
80 /* some kernels assume the default is sync rather than
81 * async. More recent kernels always report one or other,
82 * but this test makes sure we assume same as kernel
86 ee.e_flags &= ~NFSEXP_ASYNC;
87 ee.e_flags &= ~NFSEXP_GATHERED_WRITES;
89 ee.e_maptype = CLE_MAP_IDENT;
94 ee.e_mountpoint = NULL;
98 if (first || (ok = getexport(exp, sizeof(exp))) == 0) {
99 ok = getpath(ee.e_path, sizeof(ee.e_path));
102 strncpy (ee.m_path, ee.e_path, sizeof (ee.m_path) - 1);
103 ee.m_path [sizeof (ee.m_path) - 1] = '\0';
104 ok = getexport(exp, sizeof(exp));
107 xlog(L_ERROR, "expected client(options...)");
108 export_errno = EINVAL;
113 /* Check for default client */
118 if ((opt = strchr(exp, '(')) != NULL) {
120 xlog(L_WARNING, "No host name given with %s %s, suggest *%s to avoid warning", ee.e_path, exp, exp);
124 if (!(sp = strchr(opt, ')')) || sp[1] != '\0') {
125 syntaxerr("bad option list");
126 export_errno = EINVAL;
131 xlog(L_WARNING, "No options for %s %s: suggest %s(sync) to avoid warning", ee.e_path, exp, exp);
133 if (strlen(hostname) >= sizeof(ee.e_hostname)) {
134 syntaxerr("client name too long");
135 export_errno = EINVAL;
138 strncpy(ee.e_hostname, hostname, sizeof (ee.e_hostname) - 1);
139 ee.e_hostname[sizeof (ee.e_hostname) - 1] = '\0';
141 if (parseopts(opt, &ee, fromexports) < 0)
144 /* resolve symlinks */
145 if (realpath(ee.e_path, rpath) != NULL) {
146 rpath[sizeof (rpath) - 1] = '\0';
147 strncpy(ee.e_path, rpath, sizeof (ee.e_path) - 1);
148 ee.e_path[sizeof (ee.e_path) - 1] = '\0';
149 strncpy (ee.m_path, ee.e_path, sizeof (ee.m_path) - 1);
150 ee.m_path [sizeof (ee.m_path) - 1] = '\0';
157 putexportent(struct exportent *ep)
161 char *esc=ep->e_path;
167 for (i=0; esc[i]; i++)
168 if (iscntrl(esc[i]) || esc[i] == '"' || esc[i] == '\\'|| isspace(esc[i]))
169 fprintf(fp, "\\%03o", esc[i]);
171 fprintf(fp, "%c", esc[i]);
173 fprintf(fp, "\t%s(", ep->e_hostname);
174 fprintf(fp, "%s,", (ep->e_flags & NFSEXP_READONLY)? "ro" : "rw");
175 fprintf(fp, "%ssync,", (ep->e_flags & NFSEXP_ASYNC)? "a" : "");
176 fprintf(fp, "%swdelay,", (ep->e_flags & NFSEXP_GATHERED_WRITES)?
178 fprintf(fp, "%shide,", (ep->e_flags & NFSEXP_NOHIDE)?
180 fprintf(fp, "%scrossmnt,", (ep->e_flags & NFSEXP_CROSSMOUNT)?
182 fprintf(fp, "%ssecure,", (ep->e_flags & NFSEXP_INSECURE_PORT)?
184 fprintf(fp, "%sroot_squash,", (ep->e_flags & NFSEXP_ROOTSQUASH)?
186 fprintf(fp, "%sall_squash,", (ep->e_flags & NFSEXP_ALLSQUASH)?
188 fprintf(fp, "%ssubtree_check,", (ep->e_flags & NFSEXP_NOSUBTREECHECK)?
190 fprintf(fp, "%ssecure_locks,", (ep->e_flags & NFSEXP_NOAUTHNLM)?
192 fprintf(fp, "%sacl,", (ep->e_flags & NFSEXP_NOACL)?
194 if (ep->e_flags & NFSEXP_FSID) {
195 fprintf(fp, "fsid=%d,", ep->e_fsid);
197 if (ep->e_mountpoint)
198 fprintf(fp, "mountpoint%s%s,",
199 ep->e_mountpoint[0]?"=":"", ep->e_mountpoint);
201 fprintf(fp, "mapping=");
202 switch (ep->e_maptype) {
204 fprintf(fp, "identity,");
207 fprintf(fp, "ugidd,");
210 fprintf(fp, "file,");
213 xlog(L_ERROR, "unknown mapping type for %s:%s",
214 ep->e_hostname, ep->e_path);
216 if ((id = ep->e_squids) != NULL) {
217 fprintf(fp, "squash_uids=");
218 for (i = 0; i < ep->e_nsquids; i += 2)
219 if (id[i] != id[i+1])
220 fprintf(fp, "%d-%d,", id[i], id[i+1]);
222 fprintf(fp, "%d,", id[i]);
224 if ((id = ep->e_sqgids) != NULL) {
225 fprintf(fp, "squash_gids=");
226 for (i = 0; i < ep->e_nsquids; i += 2)
227 if (id[i] != id[i+1])
228 fprintf(fp, "%d-%d,", id[i], id[i+1]);
230 fprintf(fp, "%d,", id[i]);
232 fprintf(fp, "anonuid=%d,anongid=%d)\n", ep->e_anonuid, ep->e_anongid);
248 dupexportent(struct exportent *dst, struct exportent *src)
253 if ((n = src->e_nsquids) != 0) {
254 dst->e_squids = (int *) xmalloc(n * sizeof(int));
255 memcpy(dst->e_squids, src->e_squids, n * sizeof(int));
257 if ((n = src->e_nsqgids) != 0) {
258 dst->e_sqgids = (int *) xmalloc(n * sizeof(int));
259 memcpy(dst->e_sqgids, src->e_sqgids, n * sizeof(int));
261 if (src->e_mountpoint)
262 dst->e_mountpoint = strdup(src->e_mountpoint);
266 mkexportent(char *hname, char *path, char *options)
268 static struct exportent ee;
270 ee.e_flags = EXPORT_DEFAULT_FLAGS;
271 ee.e_maptype = CLE_MAP_IDENT;
276 ee.e_mountpoint = NULL;
280 if (strlen(hname) >= sizeof(ee.e_hostname)) {
281 xlog(L_WARNING, "client name %s too long", hname);
284 strncpy(ee.e_hostname, hname, sizeof (ee.e_hostname) - 1);
285 ee.e_hostname[sizeof (ee.e_hostname) - 1] = '\0';
286 if (strlen(path) >= sizeof(ee.e_path)) {
287 xlog(L_WARNING, "path name %s too long", path);
290 strncpy(ee.e_path, path, sizeof (ee.e_path));
291 ee.e_path[sizeof (ee.e_path) - 1] = '\0';
292 strncpy (ee.m_path, ee.e_path, sizeof (ee.m_path) - 1);
293 ee.m_path [sizeof (ee.m_path) - 1] = '\0';
294 if (parseopts(options, &ee, 0) < 0)
300 updateexportent(struct exportent *eep, char *options)
302 if (parseopts(options, eep, 0) < 0)
308 * Parse option string pointed to by cp and set mount options accordingly.
311 parseopts(char *cp, struct exportent *ep, int warn)
313 int had_sync_opt = 0;
314 char *flname = efname?efname:"command line";
315 int flline = efp?efp->x_line:0;
317 squids = ep->e_squids; nsquids = ep->e_nsquids;
318 sqgids = ep->e_sqgids; nsqgids = ep->e_nsqgids;
327 char *opt = strdup(cp);
329 while (*cp && *cp != ',')
332 opt[cp-optstart] = '\0';
336 /* process keyword */
337 if (strcmp(opt, "ro") == 0)
338 ep->e_flags |= NFSEXP_READONLY;
339 else if (strcmp(opt, "rw") == 0)
340 ep->e_flags &= ~NFSEXP_READONLY;
341 else if (!strcmp(opt, "secure"))
342 ep->e_flags &= ~NFSEXP_INSECURE_PORT;
343 else if (!strcmp(opt, "insecure"))
344 ep->e_flags |= NFSEXP_INSECURE_PORT;
345 else if (!strcmp(opt, "sync")) {
347 ep->e_flags &= ~NFSEXP_ASYNC;
348 } else if (!strcmp(opt, "async")) {
350 ep->e_flags |= NFSEXP_ASYNC;
351 } else if (!strcmp(opt, "nohide"))
352 ep->e_flags |= NFSEXP_NOHIDE;
353 else if (!strcmp(opt, "hide"))
354 ep->e_flags &= ~NFSEXP_NOHIDE;
355 else if (!strcmp(opt, "crossmnt"))
356 ep->e_flags |= NFSEXP_CROSSMOUNT;
357 else if (!strcmp(opt, "nocrossmnt"))
358 ep->e_flags &= ~NFSEXP_CROSSMOUNT;
359 else if (!strcmp(opt, "wdelay"))
360 ep->e_flags |= NFSEXP_GATHERED_WRITES;
361 else if (!strcmp(opt, "no_wdelay"))
362 ep->e_flags &= ~NFSEXP_GATHERED_WRITES;
363 else if (strcmp(opt, "root_squash") == 0)
364 ep->e_flags |= NFSEXP_ROOTSQUASH;
365 else if (!strcmp(opt, "no_root_squash"))
366 ep->e_flags &= ~NFSEXP_ROOTSQUASH;
367 else if (strcmp(opt, "all_squash") == 0)
368 ep->e_flags |= NFSEXP_ALLSQUASH;
369 else if (strcmp(opt, "no_all_squash") == 0)
370 ep->e_flags &= ~NFSEXP_ALLSQUASH;
371 else if (strcmp(opt, "subtree_check") == 0)
372 ep->e_flags &= ~NFSEXP_NOSUBTREECHECK;
373 else if (strcmp(opt, "no_subtree_check") == 0)
374 ep->e_flags |= NFSEXP_NOSUBTREECHECK;
375 else if (strcmp(opt, "auth_nlm") == 0)
376 ep->e_flags &= ~NFSEXP_NOAUTHNLM;
377 else if (strcmp(opt, "no_auth_nlm") == 0)
378 ep->e_flags |= NFSEXP_NOAUTHNLM;
379 else if (strcmp(opt, "secure_locks") == 0)
380 ep->e_flags &= ~NFSEXP_NOAUTHNLM;
381 else if (strcmp(opt, "insecure_locks") == 0)
382 ep->e_flags |= NFSEXP_NOAUTHNLM;
383 else if (strcmp(opt, "acl") == 0)
384 ep->e_flags &= ~NFSEXP_NOACL;
385 else if (strcmp(opt, "no_acl") == 0)
386 ep->e_flags |= NFSEXP_NOACL;
387 else if (strncmp(opt, "mapping=", 8) == 0)
388 ep->e_maptype = parsemaptype(opt+8);
389 else if (strcmp(opt, "map_identity") == 0) /* old style */
390 ep->e_maptype = CLE_MAP_IDENT;
391 else if (strcmp(opt, "map_daemon") == 0) /* old style */
392 ep->e_maptype = CLE_MAP_UGIDD;
393 else if (strncmp(opt, "anonuid=", 8) == 0) {
395 ep->e_anonuid = strtol(opt+8, &oe, 10);
396 if (opt[8]=='\0' || *oe != '\0') {
397 xlog(L_ERROR, "%s: %d: bad anonuid \"%s\"\n",
398 flname, flline, opt);
401 export_errno = EINVAL;
404 } else if (strncmp(opt, "anongid=", 8) == 0) {
406 ep->e_anongid = strtol(opt+8, &oe, 10);
407 if (opt[8]=='\0' || *oe != '\0') {
408 xlog(L_ERROR, "%s: %d: bad anongid \"%s\"\n",
409 flname, flline, opt);
412 } else if (strncmp(opt, "squash_uids=", 12) == 0) {
413 if (parsesquash(opt+12, &squids, &nsquids, &cp) < 0) {
416 } else if (strncmp(opt, "squash_gids=", 12) == 0) {
417 if (parsesquash(opt+12, &sqgids, &nsqgids, &cp) < 0) {
420 } else if (strncmp(opt, "fsid=", 5) == 0) {
422 ep->e_fsid = strtoul(opt+5, &oe, 0);
423 if (opt[5]=='\0' || *oe != '\0') {
424 xlog(L_ERROR, "%s: %d: bad fsid \"%s\"\n",
425 flname, flline, opt);
428 ep->e_flags |= NFSEXP_FSID;
429 } else if (strcmp(opt, "mountpoint")==0 ||
430 strcmp(opt, "mp") == 0 ||
431 strncmp(opt, "mountpoint=", 11)==0 ||
432 strncmp(opt, "mp=", 3) == 0) {
433 char * mp = strchr(opt, '=');
435 ep->e_mountpoint = strdup(mp+1);
437 ep->e_mountpoint = strdup("");
439 xlog(L_ERROR, "%s:%d: unknown keyword \"%s\"\n",
440 flname, flline, opt);
441 ep->e_flags |= NFSEXP_ALLSQUASH | NFSEXP_READONLY;
449 ep->e_squids = squids;
450 ep->e_sqgids = sqgids;
451 ep->e_nsquids = nsquids;
452 ep->e_nsqgids = nsqgids;
455 if (warn && !had_sync_opt && !(ep->e_flags & NFSEXP_READONLY))
456 xlog(L_WARNING, "%s [%d]: No 'sync' or 'async' option specified for export \"%s:%s\".\n"
457 " Assuming default behaviour ('sync').\n"
458 " NOTE: this default has changed from previous versions\n",
461 ep->e_hostname, ep->e_path);
467 parsesquash(char *list, int **idp, int *lenp, char **ep)
485 if (id0 == -1 || id1 == -1) {
486 syntaxerr("uid/gid -1 not permitted");
490 id = (int *) xrealloc(id, (len + 8) * sizeof(*id));
493 if (!*cp || *cp == ')' || (*cp == ',' && !isdigit(cp[1])))
496 syntaxerr("bad uid/gid list");
502 if (**ep == ',') (*ep)++;
532 while (isdigit(**cpp))
534 c = **cpp; **cpp = '\0'; num = atoi(cp); **cpp = c;
539 parsemaptype(char *type)
541 if (!strcmp(type, "identity"))
542 return CLE_MAP_IDENT;
543 if (!strcmp(type, "ugidd"))
544 return CLE_MAP_UGIDD;
545 if (!strcmp(type, "file"))
547 syntaxerr("invalid map type");
548 return CLE_MAP_IDENT; /* default */
552 getpath(char *path, int len)
555 return xgettok(efp, 0, path, len);
559 getexport(char *exp, int len)
564 if ((ok = xgettok(efp, 0, exp, len)) < 0)
565 xlog(L_ERROR, "%s:%d: syntax error",
566 efname?"command line":efname, efp->x_line);
573 xlog(L_ERROR, "%s:%d: syntax error: %s",
574 efname, efp?efp->x_line:0, msg);