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>
31 #define EXPORT_DEFAULT_FLAGS \
32 (NFSEXP_ASYNC|NFSEXP_READONLY|NFSEXP_ROOTSQUASH|NFSEXP_GATHERED_WRITES)
34 static XFILE *efp = NULL;
36 static int *squids = NULL, nsquids = 0,
37 *sqgids = NULL, nsqgids = 0;
39 static int getexport(char *exp, int len);
40 static int getpath(char *path, int len);
41 static int parseopts(char *cp, struct exportent *ep);
42 static int parsesquash(char *list, int **idp, int *lenp, char **ep);
43 static int parsenum(char **cpp);
44 static int parsemaptype(char *type);
45 static void freesquash(void);
46 static void syntaxerr(char *msg);
49 setexportent(char *fname, char *type)
54 fname = _PATH_EXPORTS;
55 if (!(efp = xfopen(fname, type)))
56 xlog(L_ERROR, "can't open %s for %sing",
57 fname, strcmp(type, "r")? "writ" : "read");
64 static struct exportent ee;
66 char rpath[MAXPATHLEN+1];
74 ee.e_flags = EXPORT_DEFAULT_FLAGS;
75 ee.e_maptype = CLE_MAP_IDENT;
83 if (first || (ok = getexport(exp, sizeof(exp))) == 0) {
84 ok = getpath(ee.e_path, sizeof(ee.e_path));
87 strncpy (ee.m_path, ee.e_path, sizeof (ee.m_path) - 1);
88 ee.m_path [sizeof (ee.m_path) - 1] = '\0';
89 ok = getexport(exp, sizeof(exp));
92 xlog(L_ERROR, "expected client(options...)");
97 /* Check for default client */
100 if ((opt = strchr(exp, '(')) != NULL) {
102 if (!(sp = strchr(opt, ')')) || sp[1] != '\0') {
103 syntaxerr("bad option list");
107 if (parseopts(opt, &ee) < 0)
110 if (strlen(exp) >= sizeof(ee.e_hostname)) {
111 syntaxerr("client name too long");
114 strncpy(ee.e_hostname, exp, sizeof (ee.e_hostname) - 1);
115 ee.e_hostname[sizeof (ee.e_hostname) - 1] = '\0';
117 /* resolve symlinks */
118 if (realpath(ee.e_path, rpath) != NULL) {
119 rpath[sizeof (rpath) - 1] = '\0';
120 strncpy(ee.e_path, rpath, sizeof (ee.e_path) - 1);
121 ee.e_path[sizeof (ee.e_path) - 1] = '\0';
122 strncpy (ee.m_path, ee.e_path, sizeof (ee.m_path) - 1);
123 ee.m_path [sizeof (ee.m_path) - 1] = '\0';
130 putexportent(struct exportent *ep)
139 fprintf(fp, "%s\t%s(", ep->e_path, ep->e_hostname);
140 fprintf(fp, "%s,", (ep->e_flags & NFSEXP_READONLY)? "ro" : "rw");
141 fprintf(fp, "%ssync,", (ep->e_flags & NFSEXP_ASYNC)? "a" : "");
142 fprintf(fp, "%swdelay,", (ep->e_flags & NFSEXP_GATHERED_WRITES)?
144 fprintf(fp, "%shide,", (ep->e_flags & NFSEXP_CROSSMNT)?
146 fprintf(fp, "%ssecure,", (ep->e_flags & NFSEXP_INSECURE_PORT)?
148 fprintf(fp, "%sroot_squash,", (ep->e_flags & NFSEXP_ROOTSQUASH)?
150 fprintf(fp, "%sall_squash,", (ep->e_flags & NFSEXP_ALLSQUASH)?
152 fprintf(fp, "%ssubtree_check,", (ep->e_flags & NFSEXP_NOSUBTREECHECK)?
155 fprintf(fp, "mapping=");
156 switch (ep->e_maptype) {
158 fprintf(fp, "identity,");
161 fprintf(fp, "ugidd,");
164 fprintf(fp, "file,");
167 xlog(L_ERROR, "unknown mapping type for %s:%s",
168 ep->e_hostname, ep->e_path);
170 if ((id = ep->e_squids) != NULL) {
171 fprintf(fp, "squash_uids=");
172 for (i = 0; i < ep->e_nsquids; i += 2)
173 if (id[i] != id[i+1])
174 fprintf(fp, "%d-%d,", id[i], id[i+1]);
176 fprintf(fp, "%d,", id[i]);
178 if ((id = ep->e_sqgids) != NULL) {
179 fprintf(fp, "squash_gids=");
180 for (i = 0; i < ep->e_nsquids; i += 2)
181 if (id[i] != id[i+1])
182 fprintf(fp, "%d-%d,", id[i], id[i+1]);
184 fprintf(fp, "%d,", id[i]);
186 fprintf(fp, "anonuid=%d,anongid=%d)\n", ep->e_anonuid, ep->e_anongid);
199 dupexportent(struct exportent *dst, struct exportent *src)
204 if ((n = src->e_nsquids) != 0) {
205 dst->e_squids = (int *) xmalloc(n * sizeof(int));
206 memcpy(dst->e_squids, src->e_squids, n * sizeof(int));
208 if ((n = src->e_nsqgids) != 0) {
209 dst->e_sqgids = (int *) xmalloc(n * sizeof(int));
210 memcpy(dst->e_sqgids, src->e_sqgids, n * sizeof(int));
215 mkexportent(char *hname, char *path, char *options)
217 static struct exportent ee;
219 ee.e_flags = EXPORT_DEFAULT_FLAGS;
220 ee.e_maptype = CLE_MAP_IDENT;
228 if (strlen(hname) >= sizeof(ee.e_hostname)) {
229 xlog(L_WARNING, "client name %s too long", hname);
232 strncpy(ee.e_hostname, hname, sizeof (ee.e_hostname) - 1);
233 ee.e_hostname[sizeof (ee.e_hostname) - 1] = '\0';
234 if (strlen(path) >= sizeof(ee.e_path)) {
235 xlog(L_WARNING, "path name %s too long", path);
238 strncpy(ee.e_path, path, sizeof (ee.e_path));
239 ee.e_path[sizeof (ee.e_path) - 1] = '\0';
240 strncpy (ee.m_path, ee.e_path, sizeof (ee.m_path) - 1);
241 ee.m_path [sizeof (ee.m_path) - 1] = '\0';
242 if (options && parseopts(options, &ee) < 0)
248 updateexportent(struct exportent *eep, char *options)
250 if (options && parseopts(options, eep) < 0)
256 * Parse option string pointed to by cp and set mount options accordingly.
259 parseopts(char *cp, struct exportent *ep)
262 squids = ep->e_squids; nsquids = ep->e_nsquids;
263 sqgids = ep->e_sqgids; nsqgids = ep->e_nsqgids;
268 char *opt = strdup(cp);
270 while (*cp && *cp != ',')
273 opt[cp-optstart] = '\0';
277 /* process keyword */
278 if (strcmp(opt, "ro") == 0)
279 ep->e_flags |= NFSEXP_READONLY;
280 else if (strcmp(opt, "rw") == 0)
281 ep->e_flags &= ~NFSEXP_READONLY;
282 else if (!strcmp(opt, "secure"))
283 ep->e_flags &= ~NFSEXP_INSECURE_PORT;
284 else if (!strcmp(opt, "insecure"))
285 ep->e_flags |= NFSEXP_INSECURE_PORT;
286 else if (!strcmp(opt, "sync"))
287 ep->e_flags &= ~NFSEXP_ASYNC;
288 else if (!strcmp(opt, "async"))
289 ep->e_flags |= NFSEXP_ASYNC;
290 else if (!strcmp(opt, "nohide"))
291 ep->e_flags |= NFSEXP_CROSSMNT;
292 else if (!strcmp(opt, "hide"))
293 ep->e_flags &= ~NFSEXP_CROSSMNT;
294 else if (!strcmp(opt, "wdelay"))
295 ep->e_flags |= NFSEXP_GATHERED_WRITES;
296 else if (!strcmp(opt, "no_wdelay"))
297 ep->e_flags &= ~NFSEXP_GATHERED_WRITES;
298 else if (strcmp(opt, "root_squash") == 0)
299 ep->e_flags |= NFSEXP_ROOTSQUASH;
300 else if (!strcmp(opt, "no_root_squash"))
301 ep->e_flags &= ~NFSEXP_ROOTSQUASH;
302 else if (strcmp(opt, "all_squash") == 0)
303 ep->e_flags |= NFSEXP_ALLSQUASH;
304 else if (strcmp(opt, "no_all_squash") == 0)
305 ep->e_flags &= ~NFSEXP_ALLSQUASH;
306 else if (strcmp(opt, "subtree_check") == 0)
307 ep->e_flags &= ~NFSEXP_NOSUBTREECHECK;
308 else if (strcmp(opt, "no_subtree_check") == 0)
309 ep->e_flags |= NFSEXP_NOSUBTREECHECK;
310 else if (strncmp(opt, "mapping=", 8) == 0)
311 ep->e_maptype = parsemaptype(opt+8);
312 else if (strcmp(opt, "map_identity") == 0) /* old style */
313 ep->e_maptype = CLE_MAP_IDENT;
314 else if (strcmp(opt, "map_daemon") == 0) /* old style */
315 ep->e_maptype = CLE_MAP_UGIDD;
316 else if (strncmp(opt, "anonuid=", 8) == 0)
317 ep->e_anonuid = atoi(opt+8);
318 else if (strncmp(opt, "anongid=", 8) == 0)
319 ep->e_anongid = atoi(opt+8);
320 else if (strncmp(opt, "squash_uids=", 12) == 0) {
321 if (parsesquash(opt+12, &squids, &nsquids, &cp) < 0) {
325 } else if (strncmp(opt, "squash_gids=", 12) == 0) {
326 if (parsesquash(opt+12, &sqgids, &nsqgids, &cp) < 0) {
332 "Unknown keyword \"%s\" in export file\n",
334 ep->e_flags |= NFSEXP_ALLSQUASH | NFSEXP_READONLY;
343 ep->e_squids = squids;
344 ep->e_sqgids = sqgids;
345 ep->e_nsquids = nsquids;
346 ep->e_nsqgids = nsqgids;
352 parsesquash(char *list, int **idp, int *lenp, char **ep)
370 if (id0 == -1 || id1 == -1) {
371 syntaxerr("uid/gid -1 not permitted");
375 id = (int *) xrealloc(id, (len + 8) * sizeof(*id));
378 if (!*cp || *cp == ')' || (*cp == ',' && !isdigit(cp[1])))
381 syntaxerr("bad uid/gid list");
387 if (*cp == ',') *ep = cp+1;
417 while (isdigit(**cpp))
419 c = **cpp; **cpp = '\0'; num = atoi(cp); **cpp = c;
424 parsemaptype(char *type)
426 if (!strcmp(type, "identity"))
427 return CLE_MAP_IDENT;
428 if (!strcmp(type, "ugidd"))
429 return CLE_MAP_UGIDD;
430 if (!strcmp(type, "file"))
432 syntaxerr("invalid map type");
433 return CLE_MAP_IDENT; /* default */
437 getpath(char *path, int len)
440 return xgettok(efp, 0, path, len);
444 getexport(char *exp, int len)
449 if ((ok = xgettok(efp, 0, exp, len)) < 0)
450 xlog(L_ERROR, "error parsing export entry");
457 xlog(L_ERROR, "syntax error in exports file (line %d): %s",