1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Herb Hasler and Rick Macklem at The University of Guelph.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #ifndef lint
36 static const char copyright[] =
37 "@(#) Copyright (c) 1989, 1993\n\
38 The Regents of the University of California. All rights reserved.\n";
39 #endif /*not lint*/
40
41 #if 0
42 #ifndef lint
43 static char sccsid[] = "@(#)mountd.c 8.15 (Berkeley) 5/1/95";
44 #endif /*not lint*/
45 #endif
46
47 #include <sys/cdefs.h>
48 __FBSDID("$FreeBSD$");
49
50 #include <sys/param.h>
51 #include <sys/fcntl.h>
52 #include <sys/fnv_hash.h>
53 #include <sys/linker.h>
54 #include <sys/module.h>
55 #include <sys/mount.h>
56 #include <sys/queue.h>
57 #include <sys/stat.h>
58 #include <sys/sysctl.h>
59 #include <sys/syslog.h>
60
61 #include <rpc/rpc.h>
62 #include <rpc/rpc_com.h>
63 #include <rpc/pmap_clnt.h>
64 #include <rpc/pmap_prot.h>
65 #include <rpcsvc/mount.h>
66 #include <nfs/nfsproto.h>
67 #include <nfs/nfssvc.h>
68 #include <nfsserver/nfs.h>
69
70 #include <fs/nfs/nfsport.h>
71
72 #include <arpa/inet.h>
73
74 #include <ctype.h>
75 #include <err.h>
76 #include <errno.h>
77 #include <grp.h>
78 #include <libutil.h>
79 #include <limits.h>
80 #include <netdb.h>
81 #include <pwd.h>
82 #include <signal.h>
83 #include <stdio.h>
84 #include <stdlib.h>
85 #include <string.h>
86 #include <unistd.h>
87 #include "pathnames.h"
88 #include "mntopts.h"
89
90 #ifdef DEBUG
91 #include <stdarg.h>
92 #endif
93
94 /*
95 * Structures for keeping the mount list and export list
96 */
97 struct mountlist {
98 char ml_host[MNTNAMLEN+1];
99 char ml_dirp[MNTPATHLEN+1];
100
101 SLIST_ENTRY(mountlist) next;
102 };
103
104 struct dirlist {
105 struct dirlist *dp_left;
106 struct dirlist *dp_right;
107 int dp_flag;
108 struct hostlist *dp_hosts; /* List of hosts this dir exported to */
109 char *dp_dirp;
110 };
111 /* dp_flag bits */
112 #define DP_DEFSET 0x1
113 #define DP_HOSTSET 0x2
114
115 struct exportlist {
116 struct dirlist *ex_dirl;
117 struct dirlist *ex_defdir;
118 struct grouplist *ex_grphead;
119 int ex_flag;
120 fsid_t ex_fs;
121 char *ex_fsdir;
122 char *ex_indexfile;
123 struct xucred ex_defanon;
124 int ex_defexflags;
125 int ex_numsecflavors;
126 int ex_secflavors[MAXSECFLAVORS];
127 int ex_defnumsecflavors;
128 int ex_defsecflavors[MAXSECFLAVORS];
129
130 SLIST_ENTRY(exportlist) entries;
131 };
132 /* ex_flag bits */
133 #define EX_LINKED 0x1
134 #define EX_DONE 0x2
135 #define EX_DEFSET 0x4
136 #define EX_PUBLICFH 0x8
137
138 SLIST_HEAD(exportlisthead, exportlist);
139
140 struct netmsk {
141 struct sockaddr_storage nt_net;
142 struct sockaddr_storage nt_mask;
143 char *nt_name;
144 };
145
146 union grouptypes {
147 struct addrinfo *gt_addrinfo;
148 struct netmsk gt_net;
149 };
150
151 struct grouplist {
152 int gr_type;
153 union grouptypes gr_ptr;
154 struct grouplist *gr_next;
155 struct xucred gr_anon;
156 int gr_exflags;
157 int gr_flag;
158 int gr_numsecflavors;
159 int gr_secflavors[MAXSECFLAVORS];
160 };
161 /* Group types */
162 #define GT_NULL 0x0
163 #define GT_HOST 0x1
164 #define GT_NET 0x2
165 #define GT_DEFAULT 0x3
166 #define GT_IGNORE 0x5
167
168 /* Group flags */
169 #define GR_FND 0x1
170
171 struct hostlist {
172 int ht_flag; /* Uses DP_xx bits */
173 struct grouplist *ht_grp;
174 struct hostlist *ht_next;
175 };
176
177 struct fhreturn {
178 int fhr_flag;
179 int fhr_vers;
180 nfsfh_t fhr_fh;
181 int fhr_numsecflavors;
182 int *fhr_secflavors;
183 };
184
185 #define GETPORT_MAXTRY 20 /* Max tries to get a port # */
186
187 /* Global defs */
188 static char *add_expdir(struct dirlist **, char *, int);
189 static void add_dlist(struct dirlist **, struct dirlist *,
190 struct grouplist *, int, struct exportlist *,
191 struct xucred *, int);
192 static void add_mlist(char *, char *);
193 static int check_dirpath(char *);
194 static int check_options(struct dirlist *);
195 static int checkmask(struct sockaddr *sa);
196 static int chk_host(struct dirlist *, struct sockaddr *, int *, int *,
197 int *, int **);
198 static char *strsep_quote(char **stringp, const char *delim);
199 static int create_service(struct netconfig *nconf);
200 static void complete_service(struct netconfig *nconf, char *port_str);
201 static void clearout_service(void);
202 static void del_mlist(char *hostp, char *dirp);
203 static struct dirlist *dirp_search(struct dirlist *, char *);
204 static int do_export_mount(struct exportlist *, struct statfs *);
205 static int do_mount(struct exportlist *, struct grouplist *, int,
206 struct xucred *, char *, int, struct statfs *, int, int *);
207 static int do_opt(char **, char **, struct exportlist *,
208 struct grouplist *, int *, int *, struct xucred *);
209 static struct exportlist *ex_search(fsid_t *, struct exportlisthead *);
210 static struct exportlist *get_exp(void);
211 static void free_dir(struct dirlist *);
212 static void free_exp(struct exportlist *);
213 static void free_grp(struct grouplist *);
214 static void free_host(struct hostlist *);
215 static void free_v4rootexp(void);
216 static void get_exportlist_one(int);
217 static void get_exportlist(int);
218 static void insert_exports(struct exportlist *, struct exportlisthead *);
219 static void free_exports(struct exportlisthead *);
220 static void read_exportfile(int);
221 static int compare_nmount_exportlist(struct iovec *, int, char *);
222 static int compare_export(struct exportlist *, struct exportlist *);
223 static int compare_cred(struct xucred *, struct xucred *);
224 static int compare_secflavor(int *, int *, int);
225 static void delete_export(struct iovec *, int, struct statfs *, char *);
226 static int get_host(char *, struct grouplist *, struct grouplist *);
227 static struct hostlist *get_ht(void);
228 static int get_line(void);
229 static void get_mountlist(void);
230 static int get_net(char *, struct netmsk *, int);
231 static void getexp_err(struct exportlist *, struct grouplist *, const char *);
232 static struct grouplist *get_grp(void);
233 static void hang_dirp(struct dirlist *, struct grouplist *,
234 struct exportlist *, int, struct xucred *, int);
235 static void huphandler(int sig);
236 static int makemask(struct sockaddr_storage *ssp, int bitlen);
237 static void mntsrv(struct svc_req *, SVCXPRT *);
238 static void nextfield(char **, char **);
239 static void out_of_mem(void);
240 static void parsecred(char *, struct xucred *);
241 static int parsesec(char *, struct exportlist *);
242 static int put_exlist(struct dirlist *, XDR *, struct dirlist *,
243 int *, int);
244 static void *sa_rawaddr(struct sockaddr *sa, int *nbytes);
245 static int sacmp(struct sockaddr *sa1, struct sockaddr *sa2,
246 struct sockaddr *samask);
247 static int scan_tree(struct dirlist *, struct sockaddr *);
248 static void usage(void);
249 static int xdr_dir(XDR *, char *);
250 static int xdr_explist(XDR *, caddr_t);
251 static int xdr_explist_brief(XDR *, caddr_t);
252 static int xdr_explist_common(XDR *, caddr_t, int);
253 static int xdr_fhs(XDR *, caddr_t);
254 static int xdr_mlist(XDR *, caddr_t);
255 static void terminate(int);
256
257 #define EXPHASH(f) (fnv_32_buf((f), sizeof(fsid_t), 0) % exphashsize)
258 static struct exportlisthead *exphead = NULL;
259 static struct exportlisthead *oldexphead = NULL;
260 static int exphashsize = 0;
261 static SLIST_HEAD(, mountlist) mlhead = SLIST_HEAD_INITIALIZER(&mlhead);
262 static char *exnames_default[2] = { _PATH_EXPORTS, NULL };
263 static char **exnames;
264 static char **hosts = NULL;
265 static struct xucred def_anon = {
266 XUCRED_VERSION,
267 (uid_t)65534,
268 1,
269 { (gid_t)65533 },
270 NULL
271 };
272 static int force_v2 = 0;
273 static int resvport_only = 1;
274 static int nhosts = 0;
275 static int dir_only = 1;
276 static int dolog = 0;
277 static int got_sighup = 0;
278 static int xcreated = 0;
279
280 static char *svcport_str = NULL;
281 static int mallocd_svcport = 0;
282 static int *sock_fd;
283 static int sock_fdcnt;
284 static int sock_fdpos;
285 static int suspend_nfsd = 0;
286
287 static int opt_flags;
288 static int have_v6 = 1;
289
290 static int v4root_phase = 0;
291 static char v4root_dirpath[PATH_MAX + 1];
292 static struct exportlist *v4root_ep = NULL;
293 static int has_publicfh = 0;
294 static int has_set_publicfh = 0;
295
296 static struct pidfh *pfh = NULL;
297 /* Bits for opt_flags above */
298 #define OP_MAPROOT 0x01
299 #define OP_MAPALL 0x02
300 /* 0x4 free */
301 #define OP_MASK 0x08
302 #define OP_NET 0x10
303 #define OP_ALLDIRS 0x40
304 #define OP_HAVEMASK 0x80 /* A mask was specified or inferred. */
305 #define OP_QUIET 0x100
306 #define OP_MASKLEN 0x200
307 #define OP_SEC 0x400
308
309 #ifdef DEBUG
310 static int debug = 1;
311 static void SYSLOG(int, const char *, ...) __printflike(2, 3);
312 #define syslog SYSLOG
313 #else
314 static int debug = 0;
315 #endif
316
317 /*
318 * The LOGDEBUG() syslog() calls are always compiled into the daemon.
319 * To enable them, create a file at _PATH_MOUNTDDEBUG. This file can be empty.
320 * To disable the logging, just delete the file at _PATH_MOUNTDDEBUG.
321 */
322 static int logdebug = 0;
323 #define LOGDEBUG(format, ...) \
324 (logdebug ? syslog(LOG_DEBUG, format, ## __VA_ARGS__) : 0)
325
326 /*
327 * Similar to strsep(), but it allows for quoted strings
328 * and escaped characters.
329 *
330 * It returns the string (or NULL, if *stringp is NULL),
331 * which is a de-quoted version of the string if necessary.
332 *
333 * It modifies *stringp in place.
334 */
335 static char *
strsep_quote(char ** stringp,const char * delim)336 strsep_quote(char **stringp, const char *delim)
337 {
338 char *srcptr, *dstptr, *retval;
339 char quot = 0;
340
341 if (stringp == NULL || *stringp == NULL)
342 return (NULL);
343
344 srcptr = dstptr = retval = *stringp;
345
346 while (*srcptr) {
347 /*
348 * We're looking for several edge cases here.
349 * First: if we're in quote state (quot != 0),
350 * then we ignore the delim characters, but otherwise
351 * process as normal, unless it is the quote character.
352 * Second: if the current character is a backslash,
353 * we take the next character as-is, without checking
354 * for delim, quote, or backslash. Exception: if the
355 * next character is a NUL, that's the end of the string.
356 * Third: if the character is a quote character, we toggle
357 * quote state.
358 * Otherwise: check the current character for NUL, or
359 * being in delim, and end the string if either is true.
360 */
361 if (*srcptr == '\\') {
362 srcptr++;
363 /*
364 * The edge case here is if the next character
365 * is NUL, we want to stop processing. But if
366 * it's not NUL, then we simply want to copy it.
367 */
368 if (*srcptr) {
369 *dstptr++ = *srcptr++;
370 }
371 continue;
372 }
373 if (quot == 0 && (*srcptr == '\'' || *srcptr == '"')) {
374 quot = *srcptr++;
375 continue;
376 }
377 if (quot && *srcptr == quot) {
378 /* End of the quoted part */
379 quot = 0;
380 srcptr++;
381 continue;
382 }
383 if (!quot && strchr(delim, *srcptr))
384 break;
385 *dstptr++ = *srcptr++;
386 }
387
388 *stringp = (*srcptr == '\0') ? NULL : srcptr + 1;
389 *dstptr = 0; /* Terminate the string */
390 return (retval);
391 }
392
393 /*
394 * Mountd server for NFS mount protocol as described in:
395 * NFS: Network File System Protocol Specification, RFC1094, Appendix A
396 * The optional arguments are the exports file name
397 * default: _PATH_EXPORTS
398 * and "-n" to allow nonroot mount.
399 */
400 int
main(int argc,char ** argv)401 main(int argc, char **argv)
402 {
403 fd_set readfds;
404 struct netconfig *nconf;
405 char *endptr, **hosts_bak;
406 void *nc_handle;
407 pid_t otherpid;
408 in_port_t svcport;
409 int c, k, s;
410 int maxrec = RPC_MAXDATASIZE;
411 int attempt_cnt, port_len, port_pos, ret;
412 char **port_list;
413
414 /* Check that another mountd isn't already running. */
415 pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &otherpid);
416 if (pfh == NULL) {
417 if (errno == EEXIST)
418 errx(1, "mountd already running, pid: %d.", otherpid);
419 warn("cannot open or create pidfile");
420 }
421
422 s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
423 if (s < 0)
424 have_v6 = 0;
425 else
426 close(s);
427
428 while ((c = getopt(argc, argv, "2deh:lnp:rS")) != -1)
429 switch (c) {
430 case '2':
431 force_v2 = 1;
432 break;
433 case 'e':
434 /* now a no-op, since this is the default */
435 break;
436 case 'n':
437 resvport_only = 0;
438 break;
439 case 'r':
440 dir_only = 0;
441 break;
442 case 'd':
443 debug = debug ? 0 : 1;
444 break;
445 case 'l':
446 dolog = 1;
447 break;
448 case 'p':
449 endptr = NULL;
450 svcport = (in_port_t)strtoul(optarg, &endptr, 10);
451 if (endptr == NULL || *endptr != '\0' ||
452 svcport == 0 || svcport >= IPPORT_MAX)
453 usage();
454 svcport_str = strdup(optarg);
455 break;
456 case 'h':
457 ++nhosts;
458 hosts_bak = hosts;
459 hosts_bak = realloc(hosts, nhosts * sizeof(char *));
460 if (hosts_bak == NULL) {
461 if (hosts != NULL) {
462 for (k = 0; k < nhosts; k++)
463 free(hosts[k]);
464 free(hosts);
465 out_of_mem();
466 }
467 }
468 hosts = hosts_bak;
469 hosts[nhosts - 1] = strdup(optarg);
470 if (hosts[nhosts - 1] == NULL) {
471 for (k = 0; k < (nhosts - 1); k++)
472 free(hosts[k]);
473 free(hosts);
474 out_of_mem();
475 }
476 break;
477 case 'S':
478 suspend_nfsd = 1;
479 break;
480 default:
481 usage();
482 }
483
484 if (modfind("nfsd") < 0) {
485 /* Not present in kernel, try loading it */
486 if (kldload("nfsd") < 0 || modfind("nfsd") < 0)
487 errx(1, "NFS server is not available");
488 }
489
490 argc -= optind;
491 argv += optind;
492 if (argc > 0)
493 exnames = argv;
494 else
495 exnames = exnames_default;
496 openlog("mountd", LOG_PID, LOG_DAEMON);
497 if (debug)
498 warnx("getting export list");
499 get_exportlist(0);
500 if (debug)
501 warnx("getting mount list");
502 get_mountlist();
503 if (debug)
504 warnx("here we go");
505 if (debug == 0) {
506 daemon(0, 0);
507 signal(SIGINT, SIG_IGN);
508 signal(SIGQUIT, SIG_IGN);
509 }
510 signal(SIGHUP, huphandler);
511 signal(SIGTERM, terminate);
512 signal(SIGPIPE, SIG_IGN);
513
514 pidfile_write(pfh);
515
516 rpcb_unset(MOUNTPROG, MOUNTVERS, NULL);
517 rpcb_unset(MOUNTPROG, MOUNTVERS3, NULL);
518 rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);
519
520 if (!resvport_only) {
521 if (sysctlbyname("vfs.nfsd.nfs_privport", NULL, NULL,
522 &resvport_only, sizeof(resvport_only)) != 0 &&
523 errno != ENOENT) {
524 syslog(LOG_ERR, "sysctl: %m");
525 exit(1);
526 }
527 }
528
529 /*
530 * If no hosts were specified, add a wildcard entry to bind to
531 * INADDR_ANY. Otherwise make sure 127.0.0.1 and ::1 are added to the
532 * list.
533 */
534 if (nhosts == 0) {
535 hosts = malloc(sizeof(char *));
536 if (hosts == NULL)
537 out_of_mem();
538 hosts[0] = "*";
539 nhosts = 1;
540 } else {
541 hosts_bak = hosts;
542 if (have_v6) {
543 hosts_bak = realloc(hosts, (nhosts + 2) *
544 sizeof(char *));
545 if (hosts_bak == NULL) {
546 for (k = 0; k < nhosts; k++)
547 free(hosts[k]);
548 free(hosts);
549 out_of_mem();
550 } else
551 hosts = hosts_bak;
552 nhosts += 2;
553 hosts[nhosts - 2] = "::1";
554 } else {
555 hosts_bak = realloc(hosts, (nhosts + 1) * sizeof(char *));
556 if (hosts_bak == NULL) {
557 for (k = 0; k < nhosts; k++)
558 free(hosts[k]);
559 free(hosts);
560 out_of_mem();
561 } else {
562 nhosts += 1;
563 hosts = hosts_bak;
564 }
565 }
566
567 hosts[nhosts - 1] = "127.0.0.1";
568 }
569
570 attempt_cnt = 1;
571 sock_fdcnt = 0;
572 sock_fd = NULL;
573 port_list = NULL;
574 port_len = 0;
575 nc_handle = setnetconfig();
576 while ((nconf = getnetconfig(nc_handle))) {
577 if (nconf->nc_flag & NC_VISIBLE) {
578 if (have_v6 == 0 && strcmp(nconf->nc_protofmly,
579 "inet6") == 0) {
580 /* DO NOTHING */
581 } else {
582 ret = create_service(nconf);
583 if (ret == 1)
584 /* Ignore this call */
585 continue;
586 if (ret < 0) {
587 /*
588 * Failed to bind port, so close off
589 * all sockets created and try again
590 * if the port# was dynamically
591 * assigned via bind(2).
592 */
593 clearout_service();
594 if (mallocd_svcport != 0 &&
595 attempt_cnt < GETPORT_MAXTRY) {
596 free(svcport_str);
597 svcport_str = NULL;
598 mallocd_svcport = 0;
599 } else {
600 errno = EADDRINUSE;
601 syslog(LOG_ERR,
602 "bindresvport_sa: %m");
603 exit(1);
604 }
605
606 /* Start over at the first service. */
607 free(sock_fd);
608 sock_fdcnt = 0;
609 sock_fd = NULL;
610 nc_handle = setnetconfig();
611 attempt_cnt++;
612 } else if (mallocd_svcport != 0 &&
613 attempt_cnt == GETPORT_MAXTRY) {
614 /*
615 * For the last attempt, allow
616 * different port #s for each nconf
617 * by saving the svcport_str and
618 * setting it back to NULL.
619 */
620 port_list = realloc(port_list,
621 (port_len + 1) * sizeof(char *));
622 if (port_list == NULL)
623 out_of_mem();
624 port_list[port_len++] = svcport_str;
625 svcport_str = NULL;
626 mallocd_svcport = 0;
627 }
628 }
629 }
630 }
631
632 /*
633 * Successfully bound the ports, so call complete_service() to
634 * do the rest of the setup on the service(s).
635 */
636 sock_fdpos = 0;
637 port_pos = 0;
638 nc_handle = setnetconfig();
639 while ((nconf = getnetconfig(nc_handle))) {
640 if (nconf->nc_flag & NC_VISIBLE) {
641 if (have_v6 == 0 && strcmp(nconf->nc_protofmly,
642 "inet6") == 0) {
643 /* DO NOTHING */
644 } else if (port_list != NULL) {
645 if (port_pos >= port_len) {
646 syslog(LOG_ERR, "too many port#s");
647 exit(1);
648 }
649 complete_service(nconf, port_list[port_pos++]);
650 } else
651 complete_service(nconf, svcport_str);
652 }
653 }
654 endnetconfig(nc_handle);
655 free(sock_fd);
656 if (port_list != NULL) {
657 for (port_pos = 0; port_pos < port_len; port_pos++)
658 free(port_list[port_pos]);
659 free(port_list);
660 }
661
662 if (xcreated == 0) {
663 syslog(LOG_ERR, "could not create any services");
664 exit(1);
665 }
666
667 /* Expand svc_run() here so that we can call get_exportlist(). */
668 for (;;) {
669 if (got_sighup) {
670 get_exportlist(1);
671 got_sighup = 0;
672 }
673 readfds = svc_fdset;
674 switch (select(svc_maxfd + 1, &readfds, NULL, NULL, NULL)) {
675 case -1:
676 if (errno == EINTR)
677 continue;
678 syslog(LOG_ERR, "mountd died: select: %m");
679 exit(1);
680 case 0:
681 continue;
682 default:
683 svc_getreqset(&readfds);
684 }
685 }
686 }
687
688 /*
689 * This routine creates and binds sockets on the appropriate
690 * addresses. It gets called one time for each transport.
691 * It returns 0 upon success, 1 for ingore the call and -1 to indicate
692 * bind failed with EADDRINUSE.
693 * Any file descriptors that have been created are stored in sock_fd and
694 * the total count of them is maintained in sock_fdcnt.
695 */
696 static int
create_service(struct netconfig * nconf)697 create_service(struct netconfig *nconf)
698 {
699 struct addrinfo hints, *res = NULL;
700 struct sockaddr_in *sin;
701 struct sockaddr_in6 *sin6;
702 struct __rpc_sockinfo si;
703 int aicode;
704 int fd;
705 int nhostsbak;
706 int one = 1;
707 int r;
708 u_int32_t host_addr[4]; /* IPv4 or IPv6 */
709 int mallocd_res;
710
711 if ((nconf->nc_semantics != NC_TPI_CLTS) &&
712 (nconf->nc_semantics != NC_TPI_COTS) &&
713 (nconf->nc_semantics != NC_TPI_COTS_ORD))
714 return (1); /* not my type */
715
716 /*
717 * XXX - using RPC library internal functions.
718 */
719 if (!__rpc_nconf2sockinfo(nconf, &si)) {
720 syslog(LOG_ERR, "cannot get information for %s",
721 nconf->nc_netid);
722 return (1);
723 }
724
725 /* Get mountd's address on this transport */
726 memset(&hints, 0, sizeof hints);
727 hints.ai_family = si.si_af;
728 hints.ai_socktype = si.si_socktype;
729 hints.ai_protocol = si.si_proto;
730
731 /*
732 * Bind to specific IPs if asked to
733 */
734 nhostsbak = nhosts;
735 while (nhostsbak > 0) {
736 --nhostsbak;
737 sock_fd = realloc(sock_fd, (sock_fdcnt + 1) * sizeof(int));
738 if (sock_fd == NULL)
739 out_of_mem();
740 sock_fd[sock_fdcnt++] = -1; /* Set invalid for now. */
741 mallocd_res = 0;
742
743 hints.ai_flags = AI_PASSIVE;
744
745 /*
746 * XXX - using RPC library internal functions.
747 */
748 if ((fd = __rpc_nconf2fd(nconf)) < 0) {
749 int non_fatal = 0;
750 if (errno == EAFNOSUPPORT &&
751 nconf->nc_semantics != NC_TPI_CLTS)
752 non_fatal = 1;
753
754 syslog(non_fatal ? LOG_DEBUG : LOG_ERR,
755 "cannot create socket for %s", nconf->nc_netid);
756 if (non_fatal != 0)
757 continue;
758 exit(1);
759 }
760
761 switch (hints.ai_family) {
762 case AF_INET:
763 if (inet_pton(AF_INET, hosts[nhostsbak],
764 host_addr) == 1) {
765 hints.ai_flags |= AI_NUMERICHOST;
766 } else {
767 /*
768 * Skip if we have an AF_INET6 address.
769 */
770 if (inet_pton(AF_INET6, hosts[nhostsbak],
771 host_addr) == 1) {
772 close(fd);
773 continue;
774 }
775 }
776 break;
777 case AF_INET6:
778 if (inet_pton(AF_INET6, hosts[nhostsbak],
779 host_addr) == 1) {
780 hints.ai_flags |= AI_NUMERICHOST;
781 } else {
782 /*
783 * Skip if we have an AF_INET address.
784 */
785 if (inet_pton(AF_INET, hosts[nhostsbak],
786 host_addr) == 1) {
787 close(fd);
788 continue;
789 }
790 }
791
792 /*
793 * We're doing host-based access checks here, so don't
794 * allow v4-in-v6 to confuse things. The kernel will
795 * disable it by default on NFS sockets too.
796 */
797 if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one,
798 sizeof one) < 0) {
799 syslog(LOG_ERR,
800 "can't disable v4-in-v6 on IPv6 socket");
801 exit(1);
802 }
803 break;
804 default:
805 break;
806 }
807
808 /*
809 * If no hosts were specified, just bind to INADDR_ANY
810 */
811 if (strcmp("*", hosts[nhostsbak]) == 0) {
812 if (svcport_str == NULL) {
813 res = malloc(sizeof(struct addrinfo));
814 if (res == NULL)
815 out_of_mem();
816 mallocd_res = 1;
817 res->ai_flags = hints.ai_flags;
818 res->ai_family = hints.ai_family;
819 res->ai_protocol = hints.ai_protocol;
820 switch (res->ai_family) {
821 case AF_INET:
822 sin = malloc(sizeof(struct sockaddr_in));
823 if (sin == NULL)
824 out_of_mem();
825 sin->sin_family = AF_INET;
826 sin->sin_port = htons(0);
827 sin->sin_addr.s_addr = htonl(INADDR_ANY);
828 res->ai_addr = (struct sockaddr*) sin;
829 res->ai_addrlen = (socklen_t)
830 sizeof(struct sockaddr_in);
831 break;
832 case AF_INET6:
833 sin6 = malloc(sizeof(struct sockaddr_in6));
834 if (sin6 == NULL)
835 out_of_mem();
836 sin6->sin6_family = AF_INET6;
837 sin6->sin6_port = htons(0);
838 sin6->sin6_addr = in6addr_any;
839 res->ai_addr = (struct sockaddr*) sin6;
840 res->ai_addrlen = (socklen_t)
841 sizeof(struct sockaddr_in6);
842 break;
843 default:
844 syslog(LOG_ERR, "bad addr fam %d",
845 res->ai_family);
846 exit(1);
847 }
848 } else {
849 if ((aicode = getaddrinfo(NULL, svcport_str,
850 &hints, &res)) != 0) {
851 syslog(LOG_ERR,
852 "cannot get local address for %s: %s",
853 nconf->nc_netid,
854 gai_strerror(aicode));
855 close(fd);
856 continue;
857 }
858 }
859 } else {
860 if ((aicode = getaddrinfo(hosts[nhostsbak], svcport_str,
861 &hints, &res)) != 0) {
862 syslog(LOG_ERR,
863 "cannot get local address for %s: %s",
864 nconf->nc_netid, gai_strerror(aicode));
865 close(fd);
866 continue;
867 }
868 }
869
870 /* Store the fd. */
871 sock_fd[sock_fdcnt - 1] = fd;
872
873 /* Now, attempt the bind. */
874 r = bindresvport_sa(fd, res->ai_addr);
875 if (r != 0) {
876 if (errno == EADDRINUSE && mallocd_svcport != 0) {
877 if (mallocd_res != 0) {
878 free(res->ai_addr);
879 free(res);
880 } else
881 freeaddrinfo(res);
882 return (-1);
883 }
884 syslog(LOG_ERR, "bindresvport_sa: %m");
885 exit(1);
886 }
887
888 if (svcport_str == NULL) {
889 svcport_str = malloc(NI_MAXSERV * sizeof(char));
890 if (svcport_str == NULL)
891 out_of_mem();
892 mallocd_svcport = 1;
893
894 if (getnameinfo(res->ai_addr,
895 res->ai_addr->sa_len, NULL, NI_MAXHOST,
896 svcport_str, NI_MAXSERV * sizeof(char),
897 NI_NUMERICHOST | NI_NUMERICSERV))
898 errx(1, "Cannot get port number");
899 }
900 if (mallocd_res != 0) {
901 free(res->ai_addr);
902 free(res);
903 } else
904 freeaddrinfo(res);
905 res = NULL;
906 }
907 return (0);
908 }
909
910 /*
911 * Called after all the create_service() calls have succeeded, to complete
912 * the setup and registration.
913 */
914 static void
complete_service(struct netconfig * nconf,char * port_str)915 complete_service(struct netconfig *nconf, char *port_str)
916 {
917 struct addrinfo hints, *res = NULL;
918 struct __rpc_sockinfo si;
919 struct netbuf servaddr;
920 SVCXPRT *transp = NULL;
921 int aicode, fd, nhostsbak;
922 int registered = 0;
923
924 if ((nconf->nc_semantics != NC_TPI_CLTS) &&
925 (nconf->nc_semantics != NC_TPI_COTS) &&
926 (nconf->nc_semantics != NC_TPI_COTS_ORD))
927 return; /* not my type */
928
929 /*
930 * XXX - using RPC library internal functions.
931 */
932 if (!__rpc_nconf2sockinfo(nconf, &si)) {
933 syslog(LOG_ERR, "cannot get information for %s",
934 nconf->nc_netid);
935 return;
936 }
937
938 nhostsbak = nhosts;
939 while (nhostsbak > 0) {
940 --nhostsbak;
941 if (sock_fdpos >= sock_fdcnt) {
942 /* Should never happen. */
943 syslog(LOG_ERR, "Ran out of socket fd's");
944 return;
945 }
946 fd = sock_fd[sock_fdpos++];
947 if (fd < 0)
948 continue;
949
950 /*
951 * Using -1 tells listen(2) to use
952 * kern.ipc.soacceptqueue for the backlog.
953 */
954 if (nconf->nc_semantics != NC_TPI_CLTS)
955 listen(fd, -1);
956
957 if (nconf->nc_semantics == NC_TPI_CLTS )
958 transp = svc_dg_create(fd, 0, 0);
959 else
960 transp = svc_vc_create(fd, RPC_MAXDATASIZE,
961 RPC_MAXDATASIZE);
962
963 if (transp != (SVCXPRT *) NULL) {
964 if (!svc_reg(transp, MOUNTPROG, MOUNTVERS, mntsrv,
965 NULL))
966 syslog(LOG_ERR,
967 "can't register %s MOUNTVERS service",
968 nconf->nc_netid);
969 if (!force_v2) {
970 if (!svc_reg(transp, MOUNTPROG, MOUNTVERS3,
971 mntsrv, NULL))
972 syslog(LOG_ERR,
973 "can't register %s MOUNTVERS3 service",
974 nconf->nc_netid);
975 }
976 } else
977 syslog(LOG_WARNING, "can't create %s services",
978 nconf->nc_netid);
979
980 if (registered == 0) {
981 registered = 1;
982 memset(&hints, 0, sizeof hints);
983 hints.ai_flags = AI_PASSIVE;
984 hints.ai_family = si.si_af;
985 hints.ai_socktype = si.si_socktype;
986 hints.ai_protocol = si.si_proto;
987
988 if ((aicode = getaddrinfo(NULL, port_str, &hints,
989 &res)) != 0) {
990 syslog(LOG_ERR, "cannot get local address: %s",
991 gai_strerror(aicode));
992 exit(1);
993 }
994
995 servaddr.buf = malloc(res->ai_addrlen);
996 memcpy(servaddr.buf, res->ai_addr, res->ai_addrlen);
997 servaddr.len = res->ai_addrlen;
998
999 rpcb_set(MOUNTPROG, MOUNTVERS, nconf, &servaddr);
1000 rpcb_set(MOUNTPROG, MOUNTVERS3, nconf, &servaddr);
1001
1002 xcreated++;
1003 freeaddrinfo(res);
1004 }
1005 } /* end while */
1006 }
1007
1008 /*
1009 * Clear out sockets after a failure to bind one of them, so that the
1010 * cycle of socket creation/binding can start anew.
1011 */
1012 static void
clearout_service(void)1013 clearout_service(void)
1014 {
1015 int i;
1016
1017 for (i = 0; i < sock_fdcnt; i++) {
1018 if (sock_fd[i] >= 0) {
1019 shutdown(sock_fd[i], SHUT_RDWR);
1020 close(sock_fd[i]);
1021 }
1022 }
1023 }
1024
1025 static void
usage(void)1026 usage(void)
1027 {
1028 fprintf(stderr,
1029 "usage: mountd [-2] [-d] [-e] [-l] [-n] [-p <port>] [-r] "
1030 "[-S] [-h <bindip>] [export_file ...]\n");
1031 exit(1);
1032 }
1033
1034 /*
1035 * The mount rpc service
1036 */
1037 void
mntsrv(struct svc_req * rqstp,SVCXPRT * transp)1038 mntsrv(struct svc_req *rqstp, SVCXPRT *transp)
1039 {
1040 struct exportlist *ep;
1041 struct dirlist *dp;
1042 struct fhreturn fhr;
1043 struct stat stb;
1044 struct statfs fsb;
1045 char host[NI_MAXHOST], numerichost[NI_MAXHOST];
1046 int lookup_failed = 1;
1047 struct sockaddr *saddr;
1048 u_short sport;
1049 char rpcpath[MNTPATHLEN + 1], dirpath[MAXPATHLEN];
1050 int bad = 0, defset, hostset;
1051 sigset_t sighup_mask;
1052 int numsecflavors, *secflavorsp;
1053
1054 sigemptyset(&sighup_mask);
1055 sigaddset(&sighup_mask, SIGHUP);
1056 saddr = svc_getrpccaller(transp)->buf;
1057 switch (saddr->sa_family) {
1058 case AF_INET6:
1059 sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port);
1060 break;
1061 case AF_INET:
1062 sport = ntohs(((struct sockaddr_in *)saddr)->sin_port);
1063 break;
1064 default:
1065 syslog(LOG_ERR, "request from unknown address family");
1066 return;
1067 }
1068 switch (rqstp->rq_proc) {
1069 case MOUNTPROC_MNT:
1070 case MOUNTPROC_UMNT:
1071 case MOUNTPROC_UMNTALL:
1072 lookup_failed = getnameinfo(saddr, saddr->sa_len, host,
1073 sizeof host, NULL, 0, 0);
1074 }
1075 getnameinfo(saddr, saddr->sa_len, numerichost,
1076 sizeof numerichost, NULL, 0, NI_NUMERICHOST);
1077 switch (rqstp->rq_proc) {
1078 case NULLPROC:
1079 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
1080 syslog(LOG_ERR, "can't send reply");
1081 return;
1082 case MOUNTPROC_MNT:
1083 if (sport >= IPPORT_RESERVED && resvport_only) {
1084 syslog(LOG_NOTICE,
1085 "mount request from %s from unprivileged port",
1086 numerichost);
1087 svcerr_weakauth(transp);
1088 return;
1089 }
1090 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
1091 syslog(LOG_NOTICE, "undecodable mount request from %s",
1092 numerichost);
1093 svcerr_decode(transp);
1094 return;
1095 }
1096
1097 /*
1098 * Get the real pathname and make sure it is a directory
1099 * or a regular file if the -r option was specified
1100 * and it exists.
1101 */
1102 if (realpath(rpcpath, dirpath) == NULL ||
1103 stat(dirpath, &stb) < 0 ||
1104 statfs(dirpath, &fsb) < 0) {
1105 chdir("/"); /* Just in case realpath doesn't */
1106 syslog(LOG_NOTICE,
1107 "mount request from %s for non existent path %s",
1108 numerichost, dirpath);
1109 if (debug)
1110 warnx("stat failed on %s", dirpath);
1111 bad = ENOENT; /* We will send error reply later */
1112 }
1113 if (!bad &&
1114 !S_ISDIR(stb.st_mode) &&
1115 (dir_only || !S_ISREG(stb.st_mode))) {
1116 syslog(LOG_NOTICE,
1117 "mount request from %s for non-directory path %s",
1118 numerichost, dirpath);
1119 if (debug)
1120 warnx("mounting non-directory %s", dirpath);
1121 bad = ENOTDIR; /* We will send error reply later */
1122 }
1123
1124 /* Check in the exports list */
1125 sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
1126 if (bad)
1127 ep = NULL;
1128 else
1129 ep = ex_search(&fsb.f_fsid, exphead);
1130 hostset = defset = 0;
1131 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset,
1132 &numsecflavors, &secflavorsp) ||
1133 ((dp = dirp_search(ep->ex_dirl, dirpath)) &&
1134 chk_host(dp, saddr, &defset, &hostset, &numsecflavors,
1135 &secflavorsp)) ||
1136 (defset && scan_tree(ep->ex_defdir, saddr) == 0 &&
1137 scan_tree(ep->ex_dirl, saddr) == 0))) {
1138 if (bad) {
1139 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
1140 (caddr_t)&bad))
1141 syslog(LOG_ERR, "can't send reply");
1142 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1143 return;
1144 }
1145 if (hostset & DP_HOSTSET) {
1146 fhr.fhr_flag = hostset;
1147 fhr.fhr_numsecflavors = numsecflavors;
1148 fhr.fhr_secflavors = secflavorsp;
1149 } else {
1150 fhr.fhr_flag = defset;
1151 fhr.fhr_numsecflavors = ep->ex_defnumsecflavors;
1152 fhr.fhr_secflavors = ep->ex_defsecflavors;
1153 }
1154 fhr.fhr_vers = rqstp->rq_vers;
1155 /* Get the file handle */
1156 memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t));
1157 if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) {
1158 bad = errno;
1159 syslog(LOG_ERR, "can't get fh for %s", dirpath);
1160 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
1161 (caddr_t)&bad))
1162 syslog(LOG_ERR, "can't send reply");
1163 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1164 return;
1165 }
1166 if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs,
1167 (caddr_t)&fhr))
1168 syslog(LOG_ERR, "can't send reply");
1169 if (!lookup_failed)
1170 add_mlist(host, dirpath);
1171 else
1172 add_mlist(numerichost, dirpath);
1173 if (debug)
1174 warnx("mount successful");
1175 if (dolog)
1176 syslog(LOG_NOTICE,
1177 "mount request succeeded from %s for %s",
1178 numerichost, dirpath);
1179 } else {
1180 if (!bad)
1181 bad = EACCES;
1182 syslog(LOG_NOTICE,
1183 "mount request denied from %s for %s",
1184 numerichost, dirpath);
1185 }
1186
1187 if (bad && !svc_sendreply(transp, (xdrproc_t)xdr_long,
1188 (caddr_t)&bad))
1189 syslog(LOG_ERR, "can't send reply");
1190 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1191 return;
1192 case MOUNTPROC_DUMP:
1193 if (!svc_sendreply(transp, (xdrproc_t)xdr_mlist, (caddr_t)NULL))
1194 syslog(LOG_ERR, "can't send reply");
1195 else if (dolog)
1196 syslog(LOG_NOTICE,
1197 "dump request succeeded from %s",
1198 numerichost);
1199 return;
1200 case MOUNTPROC_UMNT:
1201 if (sport >= IPPORT_RESERVED && resvport_only) {
1202 syslog(LOG_NOTICE,
1203 "umount request from %s from unprivileged port",
1204 numerichost);
1205 svcerr_weakauth(transp);
1206 return;
1207 }
1208 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
1209 syslog(LOG_NOTICE, "undecodable umount request from %s",
1210 numerichost);
1211 svcerr_decode(transp);
1212 return;
1213 }
1214 if (realpath(rpcpath, dirpath) == NULL) {
1215 syslog(LOG_NOTICE, "umount request from %s "
1216 "for non existent path %s",
1217 numerichost, dirpath);
1218 }
1219 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL))
1220 syslog(LOG_ERR, "can't send reply");
1221 if (!lookup_failed)
1222 del_mlist(host, dirpath);
1223 del_mlist(numerichost, dirpath);
1224 if (dolog)
1225 syslog(LOG_NOTICE,
1226 "umount request succeeded from %s for %s",
1227 numerichost, dirpath);
1228 return;
1229 case MOUNTPROC_UMNTALL:
1230 if (sport >= IPPORT_RESERVED && resvport_only) {
1231 syslog(LOG_NOTICE,
1232 "umountall request from %s from unprivileged port",
1233 numerichost);
1234 svcerr_weakauth(transp);
1235 return;
1236 }
1237 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL))
1238 syslog(LOG_ERR, "can't send reply");
1239 if (!lookup_failed)
1240 del_mlist(host, NULL);
1241 del_mlist(numerichost, NULL);
1242 if (dolog)
1243 syslog(LOG_NOTICE,
1244 "umountall request succeeded from %s",
1245 numerichost);
1246 return;
1247 case MOUNTPROC_EXPORT:
1248 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, (caddr_t)NULL))
1249 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist_brief,
1250 (caddr_t)NULL))
1251 syslog(LOG_ERR, "can't send reply");
1252 if (dolog)
1253 syslog(LOG_NOTICE,
1254 "export request succeeded from %s",
1255 numerichost);
1256 return;
1257 default:
1258 svcerr_noproc(transp);
1259 return;
1260 }
1261 }
1262
1263 /*
1264 * Xdr conversion for a dirpath string
1265 */
1266 static int
xdr_dir(XDR * xdrsp,char * dirp)1267 xdr_dir(XDR *xdrsp, char *dirp)
1268 {
1269 return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
1270 }
1271
1272 /*
1273 * Xdr routine to generate file handle reply
1274 */
1275 static int
xdr_fhs(XDR * xdrsp,caddr_t cp)1276 xdr_fhs(XDR *xdrsp, caddr_t cp)
1277 {
1278 struct fhreturn *fhrp = (struct fhreturn *)cp;
1279 u_long ok = 0, len, auth;
1280 int i;
1281
1282 if (!xdr_long(xdrsp, &ok))
1283 return (0);
1284 switch (fhrp->fhr_vers) {
1285 case 1:
1286 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH));
1287 case 3:
1288 len = NFSX_V3FH;
1289 if (!xdr_long(xdrsp, &len))
1290 return (0);
1291 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len))
1292 return (0);
1293 if (fhrp->fhr_numsecflavors) {
1294 if (!xdr_int(xdrsp, &fhrp->fhr_numsecflavors))
1295 return (0);
1296 for (i = 0; i < fhrp->fhr_numsecflavors; i++)
1297 if (!xdr_int(xdrsp, &fhrp->fhr_secflavors[i]))
1298 return (0);
1299 return (1);
1300 } else {
1301 auth = AUTH_SYS;
1302 len = 1;
1303 if (!xdr_long(xdrsp, &len))
1304 return (0);
1305 return (xdr_long(xdrsp, &auth));
1306 }
1307 }
1308 return (0);
1309 }
1310
1311 static int
xdr_mlist(XDR * xdrsp,caddr_t cp __unused)1312 xdr_mlist(XDR *xdrsp, caddr_t cp __unused)
1313 {
1314 struct mountlist *mlp;
1315 int true = 1;
1316 int false = 0;
1317 char *strp;
1318
1319 SLIST_FOREACH(mlp, &mlhead, next) {
1320 if (!xdr_bool(xdrsp, &true))
1321 return (0);
1322 strp = &mlp->ml_host[0];
1323 if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
1324 return (0);
1325 strp = &mlp->ml_dirp[0];
1326 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1327 return (0);
1328 }
1329 if (!xdr_bool(xdrsp, &false))
1330 return (0);
1331 return (1);
1332 }
1333
1334 /*
1335 * Xdr conversion for export list
1336 */
1337 static int
xdr_explist_common(XDR * xdrsp,caddr_t cp __unused,int brief)1338 xdr_explist_common(XDR *xdrsp, caddr_t cp __unused, int brief)
1339 {
1340 struct exportlist *ep;
1341 int false = 0;
1342 int putdef;
1343 sigset_t sighup_mask;
1344 int i;
1345
1346 sigemptyset(&sighup_mask);
1347 sigaddset(&sighup_mask, SIGHUP);
1348 sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
1349
1350 for (i = 0; i < exphashsize; i++)
1351 SLIST_FOREACH(ep, &exphead[i], entries) {
1352 putdef = 0;
1353 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir,
1354 &putdef, brief))
1355 goto errout;
1356 if (ep->ex_defdir && putdef == 0 &&
1357 put_exlist(ep->ex_defdir, xdrsp, NULL,
1358 &putdef, brief))
1359 goto errout;
1360 }
1361 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1362 if (!xdr_bool(xdrsp, &false))
1363 return (0);
1364 return (1);
1365 errout:
1366 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1367 return (0);
1368 }
1369
1370 /*
1371 * Called from xdr_explist() to traverse the tree and export the
1372 * directory paths.
1373 */
1374 static int
put_exlist(struct dirlist * dp,XDR * xdrsp,struct dirlist * adp,int * putdefp,int brief)1375 put_exlist(struct dirlist *dp, XDR *xdrsp, struct dirlist *adp, int *putdefp,
1376 int brief)
1377 {
1378 struct grouplist *grp;
1379 struct hostlist *hp;
1380 int true = 1;
1381 int false = 0;
1382 int gotalldir = 0;
1383 char *strp;
1384
1385 if (dp) {
1386 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp, brief))
1387 return (1);
1388 if (!xdr_bool(xdrsp, &true))
1389 return (1);
1390 strp = dp->dp_dirp;
1391 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1392 return (1);
1393 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) {
1394 gotalldir = 1;
1395 *putdefp = 1;
1396 }
1397 if (brief) {
1398 if (!xdr_bool(xdrsp, &true))
1399 return (1);
1400 strp = "(...)";
1401 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1402 return (1);
1403 } else if ((dp->dp_flag & DP_DEFSET) == 0 &&
1404 (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) {
1405 hp = dp->dp_hosts;
1406 while (hp) {
1407 grp = hp->ht_grp;
1408 if (grp->gr_type == GT_HOST) {
1409 if (!xdr_bool(xdrsp, &true))
1410 return (1);
1411 strp = grp->gr_ptr.gt_addrinfo->ai_canonname;
1412 if (!xdr_string(xdrsp, &strp,
1413 MNTNAMLEN))
1414 return (1);
1415 } else if (grp->gr_type == GT_NET) {
1416 if (!xdr_bool(xdrsp, &true))
1417 return (1);
1418 strp = grp->gr_ptr.gt_net.nt_name;
1419 if (!xdr_string(xdrsp, &strp,
1420 MNTNAMLEN))
1421 return (1);
1422 }
1423 hp = hp->ht_next;
1424 if (gotalldir && hp == (struct hostlist *)NULL) {
1425 hp = adp->dp_hosts;
1426 gotalldir = 0;
1427 }
1428 }
1429 }
1430 if (!xdr_bool(xdrsp, &false))
1431 return (1);
1432 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp, brief))
1433 return (1);
1434 }
1435 return (0);
1436 }
1437
1438 static int
xdr_explist(XDR * xdrsp,caddr_t cp)1439 xdr_explist(XDR *xdrsp, caddr_t cp)
1440 {
1441
1442 return xdr_explist_common(xdrsp, cp, 0);
1443 }
1444
1445 static int
xdr_explist_brief(XDR * xdrsp,caddr_t cp)1446 xdr_explist_brief(XDR *xdrsp, caddr_t cp)
1447 {
1448
1449 return xdr_explist_common(xdrsp, cp, 1);
1450 }
1451
1452 static char *line;
1453 static size_t linesize;
1454 static FILE *exp_file;
1455
1456 /*
1457 * Get the export list from one, currently open file
1458 */
1459 static void
get_exportlist_one(int passno)1460 get_exportlist_one(int passno)
1461 {
1462 struct exportlist *ep;
1463 struct grouplist *grp, *tgrp, *savgrp;
1464 struct dirlist *dirhead;
1465 struct statfs fsb;
1466 struct xucred anon;
1467 char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc;
1468 int len, has_host, exflags, got_nondir, dirplen, netgrp;
1469
1470 v4root_phase = 0;
1471 dirhead = (struct dirlist *)NULL;
1472 while (get_line()) {
1473 if (debug)
1474 warnx("got line %s", line);
1475 cp = line;
1476 nextfield(&cp, &endcp);
1477 if (*cp == '#')
1478 goto nextline;
1479
1480 /*
1481 * Set defaults.
1482 */
1483 has_host = FALSE;
1484 anon = def_anon;
1485 exflags = MNT_EXPORTED;
1486 got_nondir = 0;
1487 opt_flags = 0;
1488 ep = (struct exportlist *)NULL;
1489 dirp = NULL;
1490
1491 /*
1492 * Handle the V4 root dir.
1493 */
1494 if (*cp == 'V' && *(cp + 1) == '4' && *(cp + 2) == ':') {
1495 /*
1496 * V4: just indicates that it is the v4 root point,
1497 * so skip over that and set v4root_phase.
1498 */
1499 if (v4root_phase > 0) {
1500 syslog(LOG_ERR, "V4:duplicate line, ignored");
1501 goto nextline;
1502 }
1503 v4root_phase = 1;
1504 cp += 3;
1505 nextfield(&cp, &endcp);
1506 }
1507
1508 /*
1509 * Create new exports list entry
1510 */
1511 len = endcp-cp;
1512 tgrp = grp = get_grp();
1513 while (len > 0) {
1514 if (len > MNTNAMLEN) {
1515 getexp_err(ep, tgrp, "mountpoint too long");
1516 goto nextline;
1517 }
1518 if (*cp == '-') {
1519 if (ep == (struct exportlist *)NULL) {
1520 getexp_err(ep, tgrp,
1521 "flag before export path definition");
1522 goto nextline;
1523 }
1524 if (debug)
1525 warnx("doing opt %s", cp);
1526 got_nondir = 1;
1527 if (do_opt(&cp, &endcp, ep, grp, &has_host,
1528 &exflags, &anon)) {
1529 getexp_err(ep, tgrp, NULL);
1530 goto nextline;
1531 }
1532 } else if (*cp == '/') {
1533 savedc = *endcp;
1534 *endcp = '\0';
1535 if (v4root_phase > 1) {
1536 if (dirp != NULL) {
1537 getexp_err(ep, tgrp, "Multiple V4 dirs");
1538 goto nextline;
1539 }
1540 }
1541 if (check_dirpath(cp) &&
1542 statfs(cp, &fsb) >= 0) {
1543 if ((fsb.f_flags & MNT_AUTOMOUNTED) != 0)
1544 syslog(LOG_ERR, "Warning: exporting of "
1545 "automounted fs %s not supported", cp);
1546 if (got_nondir) {
1547 getexp_err(ep, tgrp, "dirs must be first");
1548 goto nextline;
1549 }
1550 if (v4root_phase == 1) {
1551 if (dirp != NULL) {
1552 getexp_err(ep, tgrp, "Multiple V4 dirs");
1553 goto nextline;
1554 }
1555 if (strlen(v4root_dirpath) == 0) {
1556 strlcpy(v4root_dirpath, cp,
1557 sizeof (v4root_dirpath));
1558 } else if (strcmp(v4root_dirpath, cp)
1559 != 0) {
1560 syslog(LOG_ERR,
1561 "different V4 dirpath %s", cp);
1562 getexp_err(ep, tgrp, NULL);
1563 goto nextline;
1564 }
1565 dirp = cp;
1566 v4root_phase = 2;
1567 got_nondir = 1;
1568 ep = get_exp();
1569 } else {
1570 if (ep) {
1571 if (ep->ex_fs.val[0] !=
1572 fsb.f_fsid.val[0] ||
1573 ep->ex_fs.val[1] !=
1574 fsb.f_fsid.val[1]) {
1575 getexp_err(ep, tgrp,
1576 "fsid mismatch");
1577 goto nextline;
1578 }
1579 } else {
1580 /*
1581 * See if this directory is already
1582 * in the list.
1583 */
1584 ep = ex_search(&fsb.f_fsid, exphead);
1585 if (ep == (struct exportlist *)NULL) {
1586 ep = get_exp();
1587 ep->ex_fs = fsb.f_fsid;
1588 ep->ex_fsdir = strdup(fsb.f_mntonname);
1589 if (ep->ex_fsdir == NULL)
1590 out_of_mem();
1591 if (debug)
1592 warnx(
1593 "making new ep fs=0x%x,0x%x",
1594 fsb.f_fsid.val[0],
1595 fsb.f_fsid.val[1]);
1596 } else if (debug)
1597 warnx("found ep fs=0x%x,0x%x",
1598 fsb.f_fsid.val[0],
1599 fsb.f_fsid.val[1]);
1600 }
1601
1602 /*
1603 * Add dirpath to export mount point.
1604 */
1605 dirp = add_expdir(&dirhead, cp, len);
1606 dirplen = len;
1607 }
1608 } else {
1609 getexp_err(ep, tgrp,
1610 "symbolic link in export path or statfs failed");
1611 goto nextline;
1612 }
1613 *endcp = savedc;
1614 } else {
1615 savedc = *endcp;
1616 *endcp = '\0';
1617 got_nondir = 1;
1618 if (ep == (struct exportlist *)NULL) {
1619 getexp_err(ep, tgrp,
1620 "host(s) before export path definition");
1621 goto nextline;
1622 }
1623
1624 /*
1625 * Get the host or netgroup.
1626 */
1627 setnetgrent(cp);
1628 netgrp = getnetgrent(&hst, &usr, &dom);
1629 do {
1630 if (has_host) {
1631 grp->gr_next = get_grp();
1632 grp = grp->gr_next;
1633 }
1634 if (netgrp) {
1635 if (hst == 0) {
1636 syslog(LOG_ERR,
1637 "null hostname in netgroup %s, skipping", cp);
1638 grp->gr_type = GT_IGNORE;
1639 } else if (get_host(hst, grp, tgrp)) {
1640 syslog(LOG_ERR,
1641 "bad host %s in netgroup %s, skipping", hst, cp);
1642 grp->gr_type = GT_IGNORE;
1643 }
1644 } else if (get_host(cp, grp, tgrp)) {
1645 syslog(LOG_ERR, "bad host %s, skipping", cp);
1646 grp->gr_type = GT_IGNORE;
1647 }
1648 has_host = TRUE;
1649 } while (netgrp && getnetgrent(&hst, &usr, &dom));
1650 endnetgrent();
1651 *endcp = savedc;
1652 }
1653 cp = endcp;
1654 nextfield(&cp, &endcp);
1655 len = endcp - cp;
1656 }
1657 if (check_options(dirhead)) {
1658 getexp_err(ep, tgrp, NULL);
1659 goto nextline;
1660 }
1661 if (!has_host) {
1662 grp->gr_type = GT_DEFAULT;
1663 if (debug)
1664 warnx("adding a default entry");
1665
1666 /*
1667 * Don't allow a network export coincide with a list of
1668 * host(s) on the same line.
1669 */
1670 } else if ((opt_flags & OP_NET) && tgrp->gr_next) {
1671 getexp_err(ep, tgrp, "network/host conflict");
1672 goto nextline;
1673
1674 /*
1675 * If an export list was specified on this line, make sure
1676 * that we have at least one valid entry, otherwise skip it.
1677 */
1678 } else {
1679 grp = tgrp;
1680 while (grp && grp->gr_type == GT_IGNORE)
1681 grp = grp->gr_next;
1682 if (! grp) {
1683 getexp_err(ep, tgrp, "no valid entries");
1684 goto nextline;
1685 }
1686 }
1687
1688 if (v4root_phase == 1) {
1689 getexp_err(ep, tgrp, "V4:root, no dirp, ignored");
1690 goto nextline;
1691 }
1692
1693 /*
1694 * Loop through hosts, pushing the exports into the kernel.
1695 * After loop, tgrp points to the start of the list and
1696 * grp points to the last entry in the list.
1697 * Do not do the do_mount() for passno == 1, since the
1698 * second pass will do it, as required.
1699 */
1700 grp = tgrp;
1701 do {
1702 grp->gr_exflags = exflags;
1703 grp->gr_anon = anon;
1704 if (v4root_phase == 2 && passno == 0)
1705 LOGDEBUG("do_mount v4root");
1706 if (passno == 0 && do_mount(ep, grp, exflags, &anon,
1707 dirp, dirplen, &fsb, ep->ex_numsecflavors,
1708 ep->ex_secflavors)) {
1709 getexp_err(ep, tgrp, NULL);
1710 goto nextline;
1711 }
1712 } while (grp->gr_next && (grp = grp->gr_next));
1713
1714 /*
1715 * For V4: don't enter in mount lists.
1716 */
1717 if (v4root_phase > 0 && v4root_phase <= 2) {
1718 /*
1719 * These structures are used for the reload,
1720 * so save them for that case. Otherwise, just
1721 * free them up now.
1722 */
1723 if (passno == 1 && ep != NULL) {
1724 savgrp = tgrp;
1725 while (tgrp != NULL) {
1726 /*
1727 * Save the security flavors and exflags
1728 * for this host set in the groups.
1729 */
1730 tgrp->gr_numsecflavors =
1731 ep->ex_numsecflavors;
1732 if (ep->ex_numsecflavors > 0)
1733 memcpy(tgrp->gr_secflavors,
1734 ep->ex_secflavors,
1735 sizeof(ep->ex_secflavors));
1736 tgrp = tgrp->gr_next;
1737 }
1738 if (v4root_ep == NULL) {
1739 v4root_ep = ep;
1740 ep = NULL; /* Don't free below. */
1741 }
1742 grp->gr_next = v4root_ep->ex_grphead;
1743 v4root_ep->ex_grphead = savgrp;
1744 }
1745 if (ep != NULL)
1746 free_exp(ep);
1747 while (tgrp != NULL) {
1748 grp = tgrp;
1749 tgrp = tgrp->gr_next;
1750 free_grp(grp);
1751 }
1752 goto nextline;
1753 }
1754
1755 /*
1756 * Success. Update the data structures.
1757 */
1758 if (has_host) {
1759 hang_dirp(dirhead, tgrp, ep, opt_flags, &anon, exflags);
1760 grp->gr_next = ep->ex_grphead;
1761 ep->ex_grphead = tgrp;
1762 } else {
1763 hang_dirp(dirhead, (struct grouplist *)NULL, ep,
1764 opt_flags, &anon, exflags);
1765 free_grp(grp);
1766 }
1767 dirhead = (struct dirlist *)NULL;
1768 if ((ep->ex_flag & EX_LINKED) == 0) {
1769 insert_exports(ep, exphead);
1770
1771 ep->ex_flag |= EX_LINKED;
1772 }
1773 nextline:
1774 v4root_phase = 0;
1775 if (dirhead) {
1776 free_dir(dirhead);
1777 dirhead = (struct dirlist *)NULL;
1778 }
1779 }
1780 }
1781
1782 /*
1783 * Get the export list from all specified files
1784 */
1785 static void
get_exportlist(int passno)1786 get_exportlist(int passno)
1787 {
1788 struct export_args export;
1789 struct iovec *iov;
1790 struct statfs *mntbufp;
1791 char errmsg[255];
1792 int num, i;
1793 int iovlen;
1794 struct nfsex_args eargs;
1795 FILE *debug_file;
1796
1797 if ((debug_file = fopen(_PATH_MOUNTDDEBUG, "r")) != NULL) {
1798 fclose(debug_file);
1799 logdebug = 1;
1800 } else
1801 logdebug = 0;
1802 LOGDEBUG("passno=%d", passno);
1803 v4root_dirpath[0] = '\0';
1804 free_v4rootexp();
1805 if (passno == 1) {
1806 /*
1807 * Save the current lists as old ones, so that the new lists
1808 * can be compared with the old ones in the 2nd pass.
1809 */
1810 for (i = 0; i < exphashsize; i++) {
1811 SLIST_FIRST(&oldexphead[i]) = SLIST_FIRST(&exphead[i]);
1812 SLIST_INIT(&exphead[i]);
1813 }
1814
1815 /* Note that the public fh has not yet been set. */
1816 has_set_publicfh = 0;
1817
1818 /* Read the export file(s) and process them */
1819 read_exportfile(passno);
1820 } else {
1821 /*
1822 * Just make the old lists empty.
1823 * exphashsize == 0 for the first call, before oldexphead
1824 * has been initialized-->loop won't be executed.
1825 */
1826 for (i = 0; i < exphashsize; i++)
1827 SLIST_INIT(&oldexphead[i]);
1828 }
1829
1830 bzero(&export, sizeof(export));
1831 export.ex_flags = MNT_DELEXPORT;
1832 iov = NULL;
1833 iovlen = 0;
1834 bzero(errmsg, sizeof(errmsg));
1835
1836 if (suspend_nfsd != 0)
1837 (void)nfssvc(NFSSVC_SUSPENDNFSD, NULL);
1838 /*
1839 * Delete the old V4 root dir.
1840 */
1841 bzero(&eargs, sizeof (eargs));
1842 eargs.export.ex_flags = MNT_DELEXPORT;
1843 if (nfssvc(NFSSVC_V4ROOTEXPORT, (caddr_t)&eargs) < 0 &&
1844 errno != ENOENT)
1845 syslog(LOG_ERR, "Can't delete exports for V4:");
1846
1847 build_iovec(&iov, &iovlen, "fstype", NULL, 0);
1848 build_iovec(&iov, &iovlen, "fspath", NULL, 0);
1849 build_iovec(&iov, &iovlen, "from", NULL, 0);
1850 build_iovec(&iov, &iovlen, "update", NULL, 0);
1851 build_iovec(&iov, &iovlen, "export", &export,
1852 sizeof(export));
1853 build_iovec(&iov, &iovlen, "errmsg", errmsg,
1854 sizeof(errmsg));
1855
1856 /*
1857 * For passno == 1, compare the old and new lists updating the kernel
1858 * exports for any cases that have changed.
1859 * This call is doing the second pass through the lists.
1860 * If it fails, fall back on the bulk reload.
1861 */
1862 if (passno == 1 && compare_nmount_exportlist(iov, iovlen, errmsg) ==
1863 0) {
1864 LOGDEBUG("compareok");
1865 /* Free up the old lists. */
1866 free_exports(oldexphead);
1867 } else {
1868 LOGDEBUG("doing passno=0");
1869 /*
1870 * Clear flag that notes if a public fh has been exported.
1871 * It is set by do_mount() if MNT_EXPUBLIC is set for the entry.
1872 */
1873 has_publicfh = 0;
1874
1875 /* exphead == NULL if not yet allocated (first call). */
1876 if (exphead != NULL) {
1877 /*
1878 * First, get rid of the old lists.
1879 */
1880 free_exports(exphead);
1881 free_exports(oldexphead);
1882 }
1883
1884 /*
1885 * And delete exports that are in the kernel for all local
1886 * filesystems.
1887 * XXX: Should know how to handle all local exportable
1888 * filesystems.
1889 */
1890 num = getmntinfo(&mntbufp, MNT_NOWAIT);
1891
1892 /* Allocate hash tables, for first call. */
1893 if (exphead == NULL) {
1894 /* Target an average linked list length of 10. */
1895 exphashsize = num / 10;
1896 if (exphashsize < 1)
1897 exphashsize = 1;
1898 else if (exphashsize > 100000)
1899 exphashsize = 100000;
1900 exphead = malloc(exphashsize * sizeof(*exphead));
1901 oldexphead = malloc(exphashsize * sizeof(*oldexphead));
1902 if (exphead == NULL || oldexphead == NULL)
1903 errx(1, "Can't malloc hash tables");
1904
1905 for (i = 0; i < exphashsize; i++) {
1906 SLIST_INIT(&exphead[i]);
1907 SLIST_INIT(&oldexphead[i]);
1908 }
1909 }
1910
1911 for (i = 0; i < num; i++)
1912 delete_export(iov, iovlen, &mntbufp[i], errmsg);
1913
1914
1915 /* Read the export file(s) and process them */
1916 read_exportfile(0);
1917 }
1918
1919 if (iov != NULL) {
1920 /* Free strings allocated by strdup() in getmntopts.c */
1921 free(iov[0].iov_base); /* fstype */
1922 free(iov[2].iov_base); /* fspath */
1923 free(iov[4].iov_base); /* from */
1924 free(iov[6].iov_base); /* update */
1925 free(iov[8].iov_base); /* export */
1926 free(iov[10].iov_base); /* errmsg */
1927
1928 /* free iov, allocated by realloc() */
1929 free(iov);
1930 iovlen = 0;
1931 }
1932
1933 /*
1934 * If there was no public fh, clear any previous one set.
1935 */
1936 if (has_publicfh == 0) {
1937 LOGDEBUG("clear public fh");
1938 (void) nfssvc(NFSSVC_NOPUBLICFH, NULL);
1939 }
1940
1941 /* Resume the nfsd. If they weren't suspended, this is harmless. */
1942 (void)nfssvc(NFSSVC_RESUMENFSD, NULL);
1943 LOGDEBUG("eo get_exportlist");
1944 }
1945
1946 /*
1947 * Insert an export entry in the appropriate list.
1948 */
1949 static void
insert_exports(struct exportlist * ep,struct exportlisthead * exhp)1950 insert_exports(struct exportlist *ep, struct exportlisthead *exhp)
1951 {
1952 uint32_t i;
1953
1954 i = EXPHASH(&ep->ex_fs);
1955 LOGDEBUG("fs=%s hash=%i", ep->ex_fsdir, i);
1956 SLIST_INSERT_HEAD(&exhp[i], ep, entries);
1957 }
1958
1959 /*
1960 * Free up the exports lists passed in as arguments.
1961 */
1962 static void
free_exports(struct exportlisthead * exhp)1963 free_exports(struct exportlisthead *exhp)
1964 {
1965 struct exportlist *ep, *ep2;
1966 int i;
1967
1968 for (i = 0; i < exphashsize; i++) {
1969 SLIST_FOREACH_SAFE(ep, &exhp[i], entries, ep2) {
1970 SLIST_REMOVE(&exhp[i], ep, exportlist, entries);
1971 free_exp(ep);
1972 }
1973 SLIST_INIT(&exhp[i]);
1974 }
1975 }
1976
1977 /*
1978 * Read the exports file(s) and call get_exportlist_one() for each line.
1979 */
1980 static void
read_exportfile(int passno)1981 read_exportfile(int passno)
1982 {
1983 int done, i;
1984
1985 /*
1986 * Read in the exports file and build the list, calling
1987 * nmount() as we go along to push the export rules into the kernel.
1988 */
1989 done = 0;
1990 for (i = 0; exnames[i] != NULL; i++) {
1991 if (debug)
1992 warnx("reading exports from %s", exnames[i]);
1993 if ((exp_file = fopen(exnames[i], "r")) == NULL) {
1994 syslog(LOG_WARNING, "can't open %s", exnames[i]);
1995 continue;
1996 }
1997 get_exportlist_one(passno);
1998 fclose(exp_file);
1999 done++;
2000 }
2001 if (done == 0) {
2002 syslog(LOG_ERR, "can't open any exports file");
2003 exit(2);
2004 }
2005 }
2006
2007 /*
2008 * Compare the export lists against the old ones and do nmount() operations
2009 * for any cases that have changed. This avoids doing nmount() for entries
2010 * that have not changed.
2011 * Return 0 upon success, 1 otherwise.
2012 */
2013 static int
compare_nmount_exportlist(struct iovec * iov,int iovlen,char * errmsg)2014 compare_nmount_exportlist(struct iovec *iov, int iovlen, char *errmsg)
2015 {
2016 struct exportlist *ep, *oep;
2017 struct grouplist *grp;
2018 struct statfs fs, ofs;
2019 int i, ret;
2020
2021 /*
2022 * Loop through the current list and look for an entry in the old
2023 * list.
2024 * If found, check to see if it the same.
2025 * If it is not the same, delete and re-export.
2026 * Then mark it done on the old list.
2027 * else (not found)
2028 * export it.
2029 * Any entries left in the old list after processing must have their
2030 * exports deleted.
2031 */
2032 for (i = 0; i < exphashsize; i++)
2033 SLIST_FOREACH(ep, &exphead[i], entries) {
2034 LOGDEBUG("foreach ep=%s", ep->ex_fsdir);
2035 oep = ex_search(&ep->ex_fs, oldexphead);
2036 if (oep != NULL) {
2037 /*
2038 * Check the mount paths are the same.
2039 * If not, return 1 so that the reload of the
2040 * exports will be done in bulk, the
2041 * passno == 0 way.
2042 */
2043 LOGDEBUG("found old exp");
2044 if (strcmp(ep->ex_fsdir, oep->ex_fsdir) != 0)
2045 return (1);
2046 LOGDEBUG("same fsdir");
2047 /*
2048 * Test to see if the entry is the same.
2049 * If not the same delete exports and
2050 * re-export.
2051 */
2052 if (compare_export(ep, oep) != 0) {
2053 /*
2054 * Clear has_publicfh if if was set
2055 * in the old exports, but only if it
2056 * has not been set during processing of
2057 * the exports for this pass, as
2058 * indicated by has_set_publicfh.
2059 */
2060 if (has_set_publicfh == 0 &&
2061 (oep->ex_flag & EX_PUBLICFH) != 0)
2062 has_publicfh = 0;
2063
2064 /* Delete and re-export. */
2065 if (statfs(ep->ex_fsdir, &fs) < 0)
2066 return (1);
2067 delete_export(iov, iovlen, &fs, errmsg);
2068 ret = do_export_mount(ep, &fs);
2069 if (ret != 0)
2070 return (ret);
2071 }
2072 oep->ex_flag |= EX_DONE;
2073 LOGDEBUG("exdone");
2074 } else {
2075 LOGDEBUG("not found so export");
2076 /* Not found, so do export. */
2077 if (statfs(ep->ex_fsdir, &fs) < 0)
2078 return (1);
2079 ret = do_export_mount(ep, &fs);
2080 if (ret != 0)
2081 return (ret);
2082 }
2083 }
2084
2085 /* Delete exports not done. */
2086 for (i = 0; i < exphashsize; i++)
2087 SLIST_FOREACH(oep, &oldexphead[i], entries) {
2088 if ((oep->ex_flag & EX_DONE) == 0) {
2089 LOGDEBUG("not done delete=%s", oep->ex_fsdir);
2090 if (statfs(oep->ex_fsdir, &ofs) >= 0 &&
2091 oep->ex_fs.val[0] == ofs.f_fsid.val[0] &&
2092 oep->ex_fs.val[1] == ofs.f_fsid.val[1]) {
2093 LOGDEBUG("do delete");
2094 /*
2095 * Clear has_publicfh if if was set
2096 * in the old exports, but only if it
2097 * has not been set during processing of
2098 * the exports for this pass, as
2099 * indicated by has_set_publicfh.
2100 */
2101 if (has_set_publicfh == 0 &&
2102 (oep->ex_flag & EX_PUBLICFH) != 0)
2103 has_publicfh = 0;
2104
2105 delete_export(iov, iovlen, &ofs,
2106 errmsg);
2107 }
2108 }
2109 }
2110
2111 /* Do the V4 root exports, as required. */
2112 grp = NULL;
2113 if (v4root_ep != NULL)
2114 grp = v4root_ep->ex_grphead;
2115 v4root_phase = 2;
2116 while (v4root_ep != NULL && grp != NULL) {
2117 LOGDEBUG("v4root expath=%s", v4root_dirpath);
2118 ret = do_mount(v4root_ep, grp, grp->gr_exflags, &grp->gr_anon,
2119 v4root_dirpath, strlen(v4root_dirpath), &fs,
2120 grp->gr_numsecflavors, grp->gr_secflavors);
2121 if (ret != 0) {
2122 v4root_phase = 0;
2123 return (ret);
2124 }
2125 grp = grp->gr_next;
2126 }
2127 v4root_phase = 0;
2128 free_v4rootexp();
2129 return (0);
2130 }
2131
2132 /*
2133 * Compare old and current exportlist entries for the fsid and return 0
2134 * if they are the same, 1 otherwise.
2135 */
2136 static int
compare_export(struct exportlist * ep,struct exportlist * oep)2137 compare_export(struct exportlist *ep, struct exportlist *oep)
2138 {
2139 struct grouplist *grp, *ogrp;
2140
2141 if (strcmp(ep->ex_fsdir, oep->ex_fsdir) != 0)
2142 return (1);
2143 if ((ep->ex_flag & EX_DEFSET) != (oep->ex_flag & EX_DEFSET))
2144 return (1);
2145 if ((ep->ex_defdir != NULL && oep->ex_defdir == NULL) ||
2146 (ep->ex_defdir == NULL && oep->ex_defdir != NULL))
2147 return (1);
2148 if (ep->ex_defdir != NULL && (ep->ex_defdir->dp_flag & DP_DEFSET) !=
2149 (oep->ex_defdir->dp_flag & DP_DEFSET))
2150 return (1);
2151 if ((ep->ex_flag & EX_DEFSET) != 0 && (ep->ex_defnumsecflavors !=
2152 oep->ex_defnumsecflavors || ep->ex_defexflags !=
2153 oep->ex_defexflags || compare_cred(&ep->ex_defanon,
2154 &oep->ex_defanon) != 0 || compare_secflavor(ep->ex_defsecflavors,
2155 oep->ex_defsecflavors, ep->ex_defnumsecflavors) != 0))
2156 return (1);
2157
2158 /* Now, check all the groups. */
2159 for (ogrp = oep->ex_grphead; ogrp != NULL; ogrp = ogrp->gr_next)
2160 ogrp->gr_flag = 0;
2161 for (grp = ep->ex_grphead; grp != NULL; grp = grp->gr_next) {
2162 for (ogrp = oep->ex_grphead; ogrp != NULL; ogrp =
2163 ogrp->gr_next)
2164 if ((ogrp->gr_flag & GR_FND) == 0 &&
2165 grp->gr_numsecflavors == ogrp->gr_numsecflavors &&
2166 grp->gr_exflags == ogrp->gr_exflags &&
2167 compare_cred(&grp->gr_anon, &ogrp->gr_anon) == 0 &&
2168 compare_secflavor(grp->gr_secflavors,
2169 ogrp->gr_secflavors, grp->gr_numsecflavors) == 0)
2170 break;
2171 if (ogrp != NULL)
2172 ogrp->gr_flag |= GR_FND;
2173 else
2174 return (1);
2175 }
2176 for (ogrp = oep->ex_grphead; ogrp != NULL; ogrp = ogrp->gr_next)
2177 if ((ogrp->gr_flag & GR_FND) == 0)
2178 return (1);
2179 return (0);
2180 }
2181
2182 /*
2183 * This algorithm compares two arrays of "n" items. It returns 0 if they are
2184 * the "same" and 1 otherwise. Although suboptimal, it is always safe to
2185 * return 1, which makes compare_nmount_export() reload the exports entry.
2186 * "same" refers to having the same set of values in the two arrays.
2187 * The arrays are in no particular order and duplicates (multiple entries
2188 * in an array with the same value) is allowed.
2189 * The algorithm is inefficient, but the common case of indentical arrays is
2190 * handled first and "n" is normally fairly small.
2191 * Since the two functions need the same algorithm but for arrays of
2192 * different types (gid_t vs int), this is done as a macro.
2193 */
2194 #define COMPARE_ARRAYS(a1, a2, n) \
2195 do { \
2196 int fnd, fndarray[(n)], i, j; \
2197 /* Handle common case of identical arrays. */ \
2198 for (i = 0; i < (n); i++) \
2199 if ((a1)[i] != (a2)[i]) \
2200 break; \
2201 if (i == (n)) \
2202 return (0); \
2203 for (i = 0; i < (n); i++) \
2204 fndarray[i] = 0; \
2205 for (i = 0; i < (n); i++) { \
2206 fnd = 0; \
2207 for (j = 0; j < (n); j++) { \
2208 if ((a1)[i] == (a2)[j]) { \
2209 fndarray[j] = 1; \
2210 fnd = 1; \
2211 } \
2212 } \
2213 if (fnd == 0) \
2214 return (1); \
2215 } \
2216 for (i = 0; i < (n); i++) \
2217 if (fndarray[i] == 0) \
2218 return (1); \
2219 return (0); \
2220 } while (0)
2221
2222 /*
2223 * Compare to struct xucred's. Return 0 if the same and 1 otherwise.
2224 */
2225 static int
compare_cred(struct xucred * cr0,struct xucred * cr1)2226 compare_cred(struct xucred *cr0, struct xucred *cr1)
2227 {
2228
2229 if (cr0->cr_uid != cr1->cr_uid || cr0->cr_ngroups != cr1->cr_ngroups)
2230 return (1);
2231
2232 COMPARE_ARRAYS(cr0->cr_groups, cr1->cr_groups, cr0->cr_ngroups);
2233 }
2234
2235 /*
2236 * Compare two lists of security flavors. Return 0 if the same and 1 otherwise.
2237 */
2238 static int
compare_secflavor(int * sec1,int * sec2,int nsec)2239 compare_secflavor(int *sec1, int *sec2, int nsec)
2240 {
2241
2242 COMPARE_ARRAYS(sec1, sec2, nsec);
2243 }
2244
2245 /*
2246 * Delete an exports entry.
2247 */
2248 static void
delete_export(struct iovec * iov,int iovlen,struct statfs * fsp,char * errmsg)2249 delete_export(struct iovec *iov, int iovlen, struct statfs *fsp, char *errmsg)
2250 {
2251 struct xvfsconf vfc;
2252
2253 if (getvfsbyname(fsp->f_fstypename, &vfc) != 0) {
2254 syslog(LOG_ERR, "getvfsbyname() failed for %s",
2255 fsp->f_fstypename);
2256 return;
2257 }
2258
2259 /*
2260 * We do not need to delete "export" flag from
2261 * filesystems that do not have it set.
2262 */
2263 if (!(fsp->f_flags & MNT_EXPORTED))
2264 return;
2265 /*
2266 * Do not delete export for network filesystem by
2267 * passing "export" arg to nmount().
2268 * It only makes sense to do this for local filesystems.
2269 */
2270 if (vfc.vfc_flags & VFCF_NETWORK)
2271 return;
2272
2273 iov[1].iov_base = fsp->f_fstypename;
2274 iov[1].iov_len = strlen(fsp->f_fstypename) + 1;
2275 iov[3].iov_base = fsp->f_mntonname;
2276 iov[3].iov_len = strlen(fsp->f_mntonname) + 1;
2277 iov[5].iov_base = fsp->f_mntfromname;
2278 iov[5].iov_len = strlen(fsp->f_mntfromname) + 1;
2279 errmsg[0] = '\0';
2280
2281 /*
2282 * EXDEV is returned when path exists but is not a
2283 * mount point. May happens if raced with unmount.
2284 */
2285 if (nmount(iov, iovlen, fsp->f_flags) < 0 && errno != ENOENT &&
2286 errno != ENOTSUP && errno != EXDEV) {
2287 syslog(LOG_ERR,
2288 "can't delete exports for %s: %m %s",
2289 fsp->f_mntonname, errmsg);
2290 }
2291 }
2292
2293 /*
2294 * Allocate an export list element
2295 */
2296 static struct exportlist *
get_exp(void)2297 get_exp(void)
2298 {
2299 struct exportlist *ep;
2300
2301 ep = (struct exportlist *)calloc(1, sizeof (struct exportlist));
2302 if (ep == (struct exportlist *)NULL)
2303 out_of_mem();
2304 return (ep);
2305 }
2306
2307 /*
2308 * Allocate a group list element
2309 */
2310 static struct grouplist *
get_grp(void)2311 get_grp(void)
2312 {
2313 struct grouplist *gp;
2314
2315 gp = (struct grouplist *)calloc(1, sizeof (struct grouplist));
2316 if (gp == (struct grouplist *)NULL)
2317 out_of_mem();
2318 return (gp);
2319 }
2320
2321 /*
2322 * Clean up upon an error in get_exportlist().
2323 */
2324 static void
getexp_err(struct exportlist * ep,struct grouplist * grp,const char * reason)2325 getexp_err(struct exportlist *ep, struct grouplist *grp, const char *reason)
2326 {
2327 struct grouplist *tgrp;
2328
2329 if (!(opt_flags & OP_QUIET)) {
2330 if (reason != NULL)
2331 syslog(LOG_ERR, "bad exports list line '%s': %s", line,
2332 reason);
2333 else
2334 syslog(LOG_ERR, "bad exports list line '%s'", line);
2335 }
2336 if (ep && (ep->ex_flag & EX_LINKED) == 0)
2337 free_exp(ep);
2338 while (grp) {
2339 tgrp = grp;
2340 grp = grp->gr_next;
2341 free_grp(tgrp);
2342 }
2343 }
2344
2345 /*
2346 * Search the export list for a matching fs.
2347 */
2348 static struct exportlist *
ex_search(fsid_t * fsid,struct exportlisthead * exhp)2349 ex_search(fsid_t *fsid, struct exportlisthead *exhp)
2350 {
2351 struct exportlist *ep;
2352 uint32_t i;
2353
2354 i = EXPHASH(fsid);
2355 SLIST_FOREACH(ep, &exhp[i], entries) {
2356 if (ep->ex_fs.val[0] == fsid->val[0] &&
2357 ep->ex_fs.val[1] == fsid->val[1])
2358 return (ep);
2359 }
2360
2361 return (ep);
2362 }
2363
2364 /*
2365 * Add a directory path to the list.
2366 */
2367 static char *
add_expdir(struct dirlist ** dpp,char * cp,int len)2368 add_expdir(struct dirlist **dpp, char *cp, int len)
2369 {
2370 struct dirlist *dp;
2371
2372 dp = malloc(sizeof (struct dirlist));
2373 if (dp == (struct dirlist *)NULL)
2374 out_of_mem();
2375 dp->dp_left = *dpp;
2376 dp->dp_right = (struct dirlist *)NULL;
2377 dp->dp_flag = 0;
2378 dp->dp_hosts = (struct hostlist *)NULL;
2379 dp->dp_dirp = strndup(cp, len);
2380 if (dp->dp_dirp == NULL)
2381 out_of_mem();
2382 *dpp = dp;
2383 return (dp->dp_dirp);
2384 }
2385
2386 /*
2387 * Hang the dir list element off the dirpath binary tree as required
2388 * and update the entry for host.
2389 */
2390 static void
hang_dirp(struct dirlist * dp,struct grouplist * grp,struct exportlist * ep,int flags,struct xucred * anoncrp,int exflags)2391 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep,
2392 int flags, struct xucred *anoncrp, int exflags)
2393 {
2394 struct hostlist *hp;
2395 struct dirlist *dp2;
2396
2397 if (flags & OP_ALLDIRS) {
2398 if (ep->ex_defdir)
2399 free((caddr_t)dp);
2400 else
2401 ep->ex_defdir = dp;
2402 if (grp == (struct grouplist *)NULL) {
2403 ep->ex_flag |= EX_DEFSET;
2404 ep->ex_defdir->dp_flag |= DP_DEFSET;
2405 /* Save the default security flavors list. */
2406 ep->ex_defnumsecflavors = ep->ex_numsecflavors;
2407 if (ep->ex_numsecflavors > 0)
2408 memcpy(ep->ex_defsecflavors, ep->ex_secflavors,
2409 sizeof(ep->ex_secflavors));
2410 ep->ex_defanon = *anoncrp;
2411 ep->ex_defexflags = exflags;
2412 } else while (grp) {
2413 hp = get_ht();
2414 hp->ht_grp = grp;
2415 hp->ht_next = ep->ex_defdir->dp_hosts;
2416 ep->ex_defdir->dp_hosts = hp;
2417 /* Save the security flavors list for this host set. */
2418 grp->gr_numsecflavors = ep->ex_numsecflavors;
2419 if (ep->ex_numsecflavors > 0)
2420 memcpy(grp->gr_secflavors, ep->ex_secflavors,
2421 sizeof(ep->ex_secflavors));
2422 grp = grp->gr_next;
2423 }
2424 } else {
2425
2426 /*
2427 * Loop through the directories adding them to the tree.
2428 */
2429 while (dp) {
2430 dp2 = dp->dp_left;
2431 add_dlist(&ep->ex_dirl, dp, grp, flags, ep, anoncrp,
2432 exflags);
2433 dp = dp2;
2434 }
2435 }
2436 }
2437
2438 /*
2439 * Traverse the binary tree either updating a node that is already there
2440 * for the new directory or adding the new node.
2441 */
2442 static void
add_dlist(struct dirlist ** dpp,struct dirlist * newdp,struct grouplist * grp,int flags,struct exportlist * ep,struct xucred * anoncrp,int exflags)2443 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp,
2444 int flags, struct exportlist *ep, struct xucred *anoncrp, int exflags)
2445 {
2446 struct dirlist *dp;
2447 struct hostlist *hp;
2448 int cmp;
2449
2450 dp = *dpp;
2451 if (dp) {
2452 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp);
2453 if (cmp > 0) {
2454 add_dlist(&dp->dp_left, newdp, grp, flags, ep, anoncrp,
2455 exflags);
2456 return;
2457 } else if (cmp < 0) {
2458 add_dlist(&dp->dp_right, newdp, grp, flags, ep, anoncrp,
2459 exflags);
2460 return;
2461 } else
2462 free((caddr_t)newdp);
2463 } else {
2464 dp = newdp;
2465 dp->dp_left = (struct dirlist *)NULL;
2466 *dpp = dp;
2467 }
2468 if (grp) {
2469
2470 /*
2471 * Hang all of the host(s) off of the directory point.
2472 */
2473 do {
2474 hp = get_ht();
2475 hp->ht_grp = grp;
2476 hp->ht_next = dp->dp_hosts;
2477 dp->dp_hosts = hp;
2478 /* Save the security flavors list for this host set. */
2479 grp->gr_numsecflavors = ep->ex_numsecflavors;
2480 if (ep->ex_numsecflavors > 0)
2481 memcpy(grp->gr_secflavors, ep->ex_secflavors,
2482 sizeof(ep->ex_secflavors));
2483 grp = grp->gr_next;
2484 } while (grp);
2485 } else {
2486 ep->ex_flag |= EX_DEFSET;
2487 dp->dp_flag |= DP_DEFSET;
2488 /* Save the default security flavors list. */
2489 ep->ex_defnumsecflavors = ep->ex_numsecflavors;
2490 if (ep->ex_numsecflavors > 0)
2491 memcpy(ep->ex_defsecflavors, ep->ex_secflavors,
2492 sizeof(ep->ex_secflavors));
2493 ep->ex_defanon = *anoncrp;
2494 ep->ex_defexflags = exflags;
2495 }
2496 }
2497
2498 /*
2499 * Search for a dirpath on the export point.
2500 */
2501 static struct dirlist *
dirp_search(struct dirlist * dp,char * dirp)2502 dirp_search(struct dirlist *dp, char *dirp)
2503 {
2504 int cmp;
2505
2506 if (dp) {
2507 cmp = strcmp(dp->dp_dirp, dirp);
2508 if (cmp > 0)
2509 return (dirp_search(dp->dp_left, dirp));
2510 else if (cmp < 0)
2511 return (dirp_search(dp->dp_right, dirp));
2512 else
2513 return (dp);
2514 }
2515 return (dp);
2516 }
2517
2518 /*
2519 * Scan for a host match in a directory tree.
2520 */
2521 static int
chk_host(struct dirlist * dp,struct sockaddr * saddr,int * defsetp,int * hostsetp,int * numsecflavors,int ** secflavorsp)2522 chk_host(struct dirlist *dp, struct sockaddr *saddr, int *defsetp,
2523 int *hostsetp, int *numsecflavors, int **secflavorsp)
2524 {
2525 struct hostlist *hp;
2526 struct grouplist *grp;
2527 struct addrinfo *ai;
2528
2529 if (dp) {
2530 if (dp->dp_flag & DP_DEFSET)
2531 *defsetp = dp->dp_flag;
2532 hp = dp->dp_hosts;
2533 while (hp) {
2534 grp = hp->ht_grp;
2535 switch (grp->gr_type) {
2536 case GT_HOST:
2537 ai = grp->gr_ptr.gt_addrinfo;
2538 for (; ai; ai = ai->ai_next) {
2539 if (!sacmp(ai->ai_addr, saddr, NULL)) {
2540 *hostsetp =
2541 (hp->ht_flag | DP_HOSTSET);
2542 if (numsecflavors != NULL) {
2543 *numsecflavors =
2544 grp->gr_numsecflavors;
2545 *secflavorsp =
2546 grp->gr_secflavors;
2547 }
2548 return (1);
2549 }
2550 }
2551 break;
2552 case GT_NET:
2553 if (!sacmp(saddr, (struct sockaddr *)
2554 &grp->gr_ptr.gt_net.nt_net,
2555 (struct sockaddr *)
2556 &grp->gr_ptr.gt_net.nt_mask)) {
2557 *hostsetp = (hp->ht_flag | DP_HOSTSET);
2558 if (numsecflavors != NULL) {
2559 *numsecflavors =
2560 grp->gr_numsecflavors;
2561 *secflavorsp =
2562 grp->gr_secflavors;
2563 }
2564 return (1);
2565 }
2566 break;
2567 }
2568 hp = hp->ht_next;
2569 }
2570 }
2571 return (0);
2572 }
2573
2574 /*
2575 * Scan tree for a host that matches the address.
2576 */
2577 static int
scan_tree(struct dirlist * dp,struct sockaddr * saddr)2578 scan_tree(struct dirlist *dp, struct sockaddr *saddr)
2579 {
2580 int defset, hostset;
2581
2582 if (dp) {
2583 if (scan_tree(dp->dp_left, saddr))
2584 return (1);
2585 if (chk_host(dp, saddr, &defset, &hostset, NULL, NULL))
2586 return (1);
2587 if (scan_tree(dp->dp_right, saddr))
2588 return (1);
2589 }
2590 return (0);
2591 }
2592
2593 /*
2594 * Traverse the dirlist tree and free it up.
2595 */
2596 static void
free_dir(struct dirlist * dp)2597 free_dir(struct dirlist *dp)
2598 {
2599
2600 if (dp) {
2601 free_dir(dp->dp_left);
2602 free_dir(dp->dp_right);
2603 free_host(dp->dp_hosts);
2604 free(dp->dp_dirp);
2605 free(dp);
2606 }
2607 }
2608
2609 /*
2610 * Parse a colon separated list of security flavors
2611 */
2612 static int
parsesec(char * seclist,struct exportlist * ep)2613 parsesec(char *seclist, struct exportlist *ep)
2614 {
2615 char *cp, savedc;
2616 int flavor;
2617
2618 ep->ex_numsecflavors = 0;
2619 for (;;) {
2620 cp = strchr(seclist, ':');
2621 if (cp) {
2622 savedc = *cp;
2623 *cp = '\0';
2624 }
2625
2626 if (!strcmp(seclist, "sys"))
2627 flavor = AUTH_SYS;
2628 else if (!strcmp(seclist, "krb5"))
2629 flavor = RPCSEC_GSS_KRB5;
2630 else if (!strcmp(seclist, "krb5i"))
2631 flavor = RPCSEC_GSS_KRB5I;
2632 else if (!strcmp(seclist, "krb5p"))
2633 flavor = RPCSEC_GSS_KRB5P;
2634 else {
2635 if (cp)
2636 *cp = savedc;
2637 syslog(LOG_ERR, "bad sec flavor: %s", seclist);
2638 return (1);
2639 }
2640 if (ep->ex_numsecflavors == MAXSECFLAVORS) {
2641 if (cp)
2642 *cp = savedc;
2643 syslog(LOG_ERR, "too many sec flavors: %s", seclist);
2644 return (1);
2645 }
2646 ep->ex_secflavors[ep->ex_numsecflavors] = flavor;
2647 ep->ex_numsecflavors++;
2648 if (cp) {
2649 *cp = savedc;
2650 seclist = cp + 1;
2651 } else {
2652 break;
2653 }
2654 }
2655 return (0);
2656 }
2657
2658 /*
2659 * Parse the option string and update fields.
2660 * Option arguments may either be -<option>=<value> or
2661 * -<option> <value>
2662 */
2663 static int
do_opt(char ** cpp,char ** endcpp,struct exportlist * ep,struct grouplist * grp,int * has_hostp,int * exflagsp,struct xucred * cr)2664 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp,
2665 int *has_hostp, int *exflagsp, struct xucred *cr)
2666 {
2667 char *cpoptarg, *cpoptend;
2668 char *cp, *endcp, *cpopt, savedc, savedc2;
2669 int allflag, usedarg;
2670
2671 savedc2 = '\0';
2672 cpopt = *cpp;
2673 cpopt++;
2674 cp = *endcpp;
2675 savedc = *cp;
2676 *cp = '\0';
2677 while (cpopt && *cpopt) {
2678 allflag = 1;
2679 usedarg = -2;
2680 if ((cpoptend = strchr(cpopt, ','))) {
2681 *cpoptend++ = '\0';
2682 if ((cpoptarg = strchr(cpopt, '=')))
2683 *cpoptarg++ = '\0';
2684 } else {
2685 if ((cpoptarg = strchr(cpopt, '=')))
2686 *cpoptarg++ = '\0';
2687 else {
2688 *cp = savedc;
2689 nextfield(&cp, &endcp);
2690 **endcpp = '\0';
2691 if (endcp > cp && *cp != '-') {
2692 cpoptarg = cp;
2693 savedc2 = *endcp;
2694 *endcp = '\0';
2695 usedarg = 0;
2696 }
2697 }
2698 }
2699 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) {
2700 *exflagsp |= MNT_EXRDONLY;
2701 } else if (cpoptarg && (!strcmp(cpopt, "maproot") ||
2702 !(allflag = strcmp(cpopt, "mapall")) ||
2703 !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) {
2704 usedarg++;
2705 parsecred(cpoptarg, cr);
2706 if (allflag == 0) {
2707 *exflagsp |= MNT_EXPORTANON;
2708 opt_flags |= OP_MAPALL;
2709 } else
2710 opt_flags |= OP_MAPROOT;
2711 } else if (cpoptarg && (!strcmp(cpopt, "mask") ||
2712 !strcmp(cpopt, "m"))) {
2713 if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) {
2714 syslog(LOG_ERR, "bad mask: %s", cpoptarg);
2715 return (1);
2716 }
2717 usedarg++;
2718 opt_flags |= OP_MASK;
2719 } else if (cpoptarg && (!strcmp(cpopt, "network") ||
2720 !strcmp(cpopt, "n"))) {
2721 if (strchr(cpoptarg, '/') != NULL) {
2722 if (debug)
2723 fprintf(stderr, "setting OP_MASKLEN\n");
2724 opt_flags |= OP_MASKLEN;
2725 }
2726 if (grp->gr_type != GT_NULL) {
2727 syslog(LOG_ERR, "network/host conflict");
2728 return (1);
2729 } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) {
2730 syslog(LOG_ERR, "bad net: %s", cpoptarg);
2731 return (1);
2732 }
2733 grp->gr_type = GT_NET;
2734 *has_hostp = 1;
2735 usedarg++;
2736 opt_flags |= OP_NET;
2737 } else if (!strcmp(cpopt, "alldirs")) {
2738 opt_flags |= OP_ALLDIRS;
2739 } else if (!strcmp(cpopt, "public")) {
2740 *exflagsp |= MNT_EXPUBLIC;
2741 } else if (!strcmp(cpopt, "webnfs")) {
2742 *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON);
2743 opt_flags |= OP_MAPALL;
2744 } else if (cpoptarg && !strcmp(cpopt, "index")) {
2745 ep->ex_indexfile = strdup(cpoptarg);
2746 } else if (!strcmp(cpopt, "quiet")) {
2747 opt_flags |= OP_QUIET;
2748 } else if (cpoptarg && !strcmp(cpopt, "sec")) {
2749 if (parsesec(cpoptarg, ep))
2750 return (1);
2751 opt_flags |= OP_SEC;
2752 usedarg++;
2753 } else {
2754 syslog(LOG_ERR, "bad opt %s", cpopt);
2755 return (1);
2756 }
2757 if (usedarg >= 0) {
2758 *endcp = savedc2;
2759 **endcpp = savedc;
2760 if (usedarg > 0) {
2761 *cpp = cp;
2762 *endcpp = endcp;
2763 }
2764 return (0);
2765 }
2766 cpopt = cpoptend;
2767 }
2768 **endcpp = savedc;
2769 return (0);
2770 }
2771
2772 /*
2773 * Translate a character string to the corresponding list of network
2774 * addresses for a hostname.
2775 */
2776 static int
get_host(char * cp,struct grouplist * grp,struct grouplist * tgrp)2777 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp)
2778 {
2779 struct grouplist *checkgrp;
2780 struct addrinfo *ai, *tai, hints;
2781 int ecode;
2782 char host[NI_MAXHOST];
2783
2784 if (grp->gr_type != GT_NULL) {
2785 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp);
2786 return (1);
2787 }
2788 memset(&hints, 0, sizeof hints);
2789 hints.ai_flags = AI_CANONNAME;
2790 hints.ai_protocol = IPPROTO_UDP;
2791 ecode = getaddrinfo(cp, NULL, &hints, &ai);
2792 if (ecode != 0) {
2793 syslog(LOG_ERR,"can't get address info for host %s", cp);
2794 return 1;
2795 }
2796 grp->gr_ptr.gt_addrinfo = ai;
2797 while (ai != NULL) {
2798 if (ai->ai_canonname == NULL) {
2799 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host,
2800 sizeof host, NULL, 0, NI_NUMERICHOST) != 0)
2801 strlcpy(host, "?", sizeof(host));
2802 ai->ai_canonname = strdup(host);
2803 ai->ai_flags |= AI_CANONNAME;
2804 }
2805 if (debug)
2806 fprintf(stderr, "got host %s\n", ai->ai_canonname);
2807 /*
2808 * Sanity check: make sure we don't already have an entry
2809 * for this host in the grouplist.
2810 */
2811 for (checkgrp = tgrp; checkgrp != NULL;
2812 checkgrp = checkgrp->gr_next) {
2813 if (checkgrp->gr_type != GT_HOST)
2814 continue;
2815 for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL;
2816 tai = tai->ai_next) {
2817 if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0)
2818 continue;
2819 if (debug)
2820 fprintf(stderr,
2821 "ignoring duplicate host %s\n",
2822 ai->ai_canonname);
2823 grp->gr_type = GT_IGNORE;
2824 return (0);
2825 }
2826 }
2827 ai = ai->ai_next;
2828 }
2829 grp->gr_type = GT_HOST;
2830 return (0);
2831 }
2832
2833 /*
2834 * Free up an exports list component
2835 */
2836 static void
free_exp(struct exportlist * ep)2837 free_exp(struct exportlist *ep)
2838 {
2839 struct grouplist *grp, *tgrp;
2840
2841 if (ep->ex_defdir) {
2842 free_host(ep->ex_defdir->dp_hosts);
2843 free((caddr_t)ep->ex_defdir);
2844 }
2845 if (ep->ex_fsdir)
2846 free(ep->ex_fsdir);
2847 if (ep->ex_indexfile)
2848 free(ep->ex_indexfile);
2849 free_dir(ep->ex_dirl);
2850 grp = ep->ex_grphead;
2851 while (grp) {
2852 tgrp = grp;
2853 grp = grp->gr_next;
2854 free_grp(tgrp);
2855 }
2856 free((caddr_t)ep);
2857 }
2858
2859 /*
2860 * Free up the v4root exports.
2861 */
2862 static void
free_v4rootexp(void)2863 free_v4rootexp(void)
2864 {
2865
2866 if (v4root_ep != NULL) {
2867 free_exp(v4root_ep);
2868 v4root_ep = NULL;
2869 }
2870 }
2871
2872 /*
2873 * Free hosts.
2874 */
2875 static void
free_host(struct hostlist * hp)2876 free_host(struct hostlist *hp)
2877 {
2878 struct hostlist *hp2;
2879
2880 while (hp) {
2881 hp2 = hp;
2882 hp = hp->ht_next;
2883 free((caddr_t)hp2);
2884 }
2885 }
2886
2887 static struct hostlist *
get_ht(void)2888 get_ht(void)
2889 {
2890 struct hostlist *hp;
2891
2892 hp = (struct hostlist *)malloc(sizeof (struct hostlist));
2893 if (hp == (struct hostlist *)NULL)
2894 out_of_mem();
2895 hp->ht_next = (struct hostlist *)NULL;
2896 hp->ht_flag = 0;
2897 return (hp);
2898 }
2899
2900 /*
2901 * Out of memory, fatal
2902 */
2903 static void
out_of_mem(void)2904 out_of_mem(void)
2905 {
2906
2907 syslog(LOG_ERR, "out of memory");
2908 exit(2);
2909 }
2910
2911 /*
2912 * Call do_mount() from the struct exportlist, for each case needed.
2913 */
2914 static int
do_export_mount(struct exportlist * ep,struct statfs * fsp)2915 do_export_mount(struct exportlist *ep, struct statfs *fsp)
2916 {
2917 struct grouplist *grp, defgrp;
2918 int ret;
2919 size_t dirlen;
2920
2921 LOGDEBUG("do_export_mount=%s", ep->ex_fsdir);
2922 dirlen = strlen(ep->ex_fsdir);
2923 if ((ep->ex_flag & EX_DEFSET) != 0) {
2924 defgrp.gr_type = GT_DEFAULT;
2925 defgrp.gr_next = NULL;
2926 /* We have an entry for all other hosts/nets. */
2927 LOGDEBUG("ex_defexflags=0x%x", ep->ex_defexflags);
2928 ret = do_mount(ep, &defgrp, ep->ex_defexflags, &ep->ex_defanon,
2929 ep->ex_fsdir, dirlen, fsp, ep->ex_defnumsecflavors,
2930 ep->ex_defsecflavors);
2931 if (ret != 0)
2932 return (ret);
2933 }
2934
2935 /* Do a mount for each group. */
2936 grp = ep->ex_grphead;
2937 while (grp != NULL) {
2938 LOGDEBUG("do mount gr_type=0x%x gr_exflags=0x%x",
2939 grp->gr_type, grp->gr_exflags);
2940 ret = do_mount(ep, grp, grp->gr_exflags, &grp->gr_anon,
2941 ep->ex_fsdir, dirlen, fsp, grp->gr_numsecflavors,
2942 grp->gr_secflavors);
2943 if (ret != 0)
2944 return (ret);
2945 grp = grp->gr_next;
2946 }
2947 return (0);
2948 }
2949
2950 /*
2951 * Do the nmount() syscall with the update flag to push the export info into
2952 * the kernel.
2953 */
2954 static int
do_mount(struct exportlist * ep,struct grouplist * grp,int exflags,struct xucred * anoncrp,char * dirp,int dirplen,struct statfs * fsb,int numsecflavors,int * secflavors)2955 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags,
2956 struct xucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb,
2957 int numsecflavors, int *secflavors)
2958 {
2959 struct statfs fsb1;
2960 struct addrinfo *ai;
2961 struct export_args *eap;
2962 char errmsg[255];
2963 char *cp;
2964 int done;
2965 char savedc;
2966 struct iovec *iov;
2967 int i, iovlen;
2968 int ret;
2969 struct nfsex_args nfsea;
2970
2971 eap = &nfsea.export;
2972
2973 cp = NULL;
2974 savedc = '\0';
2975 iov = NULL;
2976 iovlen = 0;
2977 ret = 0;
2978
2979 bzero(eap, sizeof (struct export_args));
2980 bzero(errmsg, sizeof(errmsg));
2981 eap->ex_flags = exflags;
2982 eap->ex_anon = *anoncrp;
2983 LOGDEBUG("do_mount exflags=0x%x", exflags);
2984 eap->ex_indexfile = ep->ex_indexfile;
2985 if (grp->gr_type == GT_HOST)
2986 ai = grp->gr_ptr.gt_addrinfo;
2987 else
2988 ai = NULL;
2989 eap->ex_numsecflavors = numsecflavors;
2990 LOGDEBUG("do_mount numsec=%d", numsecflavors);
2991 for (i = 0; i < eap->ex_numsecflavors; i++)
2992 eap->ex_secflavors[i] = secflavors[i];
2993 if (eap->ex_numsecflavors == 0) {
2994 eap->ex_numsecflavors = 1;
2995 eap->ex_secflavors[0] = AUTH_SYS;
2996 }
2997 done = FALSE;
2998
2999 if (v4root_phase == 0) {
3000 build_iovec(&iov, &iovlen, "fstype", NULL, 0);
3001 build_iovec(&iov, &iovlen, "fspath", NULL, 0);
3002 build_iovec(&iov, &iovlen, "from", NULL, 0);
3003 build_iovec(&iov, &iovlen, "update", NULL, 0);
3004 build_iovec(&iov, &iovlen, "export", eap,
3005 sizeof (struct export_args));
3006 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
3007 }
3008
3009 while (!done) {
3010 switch (grp->gr_type) {
3011 case GT_HOST:
3012 if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0)
3013 goto skip;
3014 eap->ex_addr = ai->ai_addr;
3015 eap->ex_addrlen = ai->ai_addrlen;
3016 eap->ex_masklen = 0;
3017 break;
3018 case GT_NET:
3019 if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 &&
3020 have_v6 == 0)
3021 goto skip;
3022 eap->ex_addr =
3023 (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net;
3024 eap->ex_addrlen =
3025 ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_net)->sa_len;
3026 eap->ex_mask =
3027 (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask;
3028 eap->ex_masklen = ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask)->sa_len;
3029 break;
3030 case GT_DEFAULT:
3031 eap->ex_addr = NULL;
3032 eap->ex_addrlen = 0;
3033 eap->ex_mask = NULL;
3034 eap->ex_masklen = 0;
3035 break;
3036 case GT_IGNORE:
3037 ret = 0;
3038 goto error_exit;
3039 break;
3040 default:
3041 syslog(LOG_ERR, "bad grouptype");
3042 if (cp)
3043 *cp = savedc;
3044 ret = 1;
3045 goto error_exit;
3046 }
3047
3048 /*
3049 * For V4:, use the nfssvc() syscall, instead of mount().
3050 */
3051 if (v4root_phase == 2) {
3052 nfsea.fspec = v4root_dirpath;
3053 if (nfssvc(NFSSVC_V4ROOTEXPORT, (caddr_t)&nfsea) < 0) {
3054 syslog(LOG_ERR, "Exporting V4: failed");
3055 return (2);
3056 }
3057 } else {
3058 /*
3059 * XXX:
3060 * Maybe I should just use the fsb->f_mntonname path
3061 * instead of looping back up the dirp to the mount
3062 * point??
3063 * Also, needs to know how to export all types of local
3064 * exportable filesystems and not just "ufs".
3065 */
3066 iov[1].iov_base = fsb->f_fstypename; /* "fstype" */
3067 iov[1].iov_len = strlen(fsb->f_fstypename) + 1;
3068 iov[3].iov_base = fsb->f_mntonname; /* "fspath" */
3069 iov[3].iov_len = strlen(fsb->f_mntonname) + 1;
3070 iov[5].iov_base = fsb->f_mntfromname; /* "from" */
3071 iov[5].iov_len = strlen(fsb->f_mntfromname) + 1;
3072 errmsg[0] = '\0';
3073
3074 while (nmount(iov, iovlen, fsb->f_flags) < 0) {
3075 if (cp)
3076 *cp-- = savedc;
3077 else
3078 cp = dirp + dirplen - 1;
3079 if (opt_flags & OP_QUIET) {
3080 ret = 1;
3081 goto error_exit;
3082 }
3083 if (errno == EPERM) {
3084 if (debug)
3085 warnx("can't change attributes for %s: %s",
3086 dirp, errmsg);
3087 syslog(LOG_ERR,
3088 "can't change attributes for %s: %s",
3089 dirp, errmsg);
3090 ret = 1;
3091 goto error_exit;
3092 }
3093 if (opt_flags & OP_ALLDIRS) {
3094 if (errno == EINVAL)
3095 syslog(LOG_ERR,
3096 "-alldirs requested but %s is not a filesystem mountpoint",
3097 dirp);
3098 else
3099 syslog(LOG_ERR,
3100 "could not remount %s: %m",
3101 dirp);
3102 ret = 1;
3103 goto error_exit;
3104 }
3105 /* back up over the last component */
3106 while (*cp == '/' && cp > dirp)
3107 cp--;
3108 while (*(cp - 1) != '/' && cp > dirp)
3109 cp--;
3110 if (cp == dirp) {
3111 if (debug)
3112 warnx("mnt unsucc");
3113 syslog(LOG_ERR, "can't export %s %s",
3114 dirp, errmsg);
3115 ret = 1;
3116 goto error_exit;
3117 }
3118 savedc = *cp;
3119 *cp = '\0';
3120 /*
3121 * Check that we're still on the same
3122 * filesystem.
3123 */
3124 if (statfs(dirp, &fsb1) != 0 ||
3125 bcmp(&fsb1.f_fsid, &fsb->f_fsid,
3126 sizeof (fsb1.f_fsid)) != 0) {
3127 *cp = savedc;
3128 syslog(LOG_ERR,
3129 "can't export %s %s", dirp,
3130 errmsg);
3131 ret = 1;
3132 goto error_exit;
3133 }
3134 }
3135 }
3136
3137 /*
3138 * For the experimental server:
3139 * If this is the public directory, get the file handle
3140 * and load it into the kernel via the nfssvc() syscall.
3141 */
3142 if ((exflags & MNT_EXPUBLIC) != 0) {
3143 fhandle_t fh;
3144 char *public_name;
3145
3146 if (eap->ex_indexfile != NULL)
3147 public_name = eap->ex_indexfile;
3148 else
3149 public_name = dirp;
3150 if (getfh(public_name, &fh) < 0)
3151 syslog(LOG_ERR,
3152 "Can't get public fh for %s", public_name);
3153 else if (nfssvc(NFSSVC_PUBLICFH, (caddr_t)&fh) < 0)
3154 syslog(LOG_ERR,
3155 "Can't set public fh for %s", public_name);
3156 else {
3157 has_publicfh = 1;
3158 has_set_publicfh = 1;
3159 ep->ex_flag |= EX_PUBLICFH;
3160 }
3161 }
3162 skip:
3163 if (ai != NULL)
3164 ai = ai->ai_next;
3165 if (ai == NULL)
3166 done = TRUE;
3167 }
3168 if (cp)
3169 *cp = savedc;
3170 error_exit:
3171 /* free strings allocated by strdup() in getmntopts.c */
3172 if (iov != NULL) {
3173 free(iov[0].iov_base); /* fstype */
3174 free(iov[2].iov_base); /* fspath */
3175 free(iov[4].iov_base); /* from */
3176 free(iov[6].iov_base); /* update */
3177 free(iov[8].iov_base); /* export */
3178 free(iov[10].iov_base); /* errmsg */
3179
3180 /* free iov, allocated by realloc() */
3181 free(iov);
3182 }
3183 return (ret);
3184 }
3185
3186 /*
3187 * Translate a net address.
3188 *
3189 * If `maskflg' is nonzero, then `cp' is a netmask, not a network address.
3190 */
3191 static int
get_net(char * cp,struct netmsk * net,int maskflg)3192 get_net(char *cp, struct netmsk *net, int maskflg)
3193 {
3194 struct netent *np = NULL;
3195 char *name, *p, *prefp;
3196 struct sockaddr_in sin;
3197 struct sockaddr *sa = NULL;
3198 struct addrinfo hints, *ai = NULL;
3199 char netname[NI_MAXHOST];
3200 long preflen;
3201
3202 p = prefp = NULL;
3203 if ((opt_flags & OP_MASKLEN) && !maskflg) {
3204 p = strchr(cp, '/');
3205 *p = '\0';
3206 prefp = p + 1;
3207 }
3208
3209 /*
3210 * Check for a numeric address first. We wish to avoid
3211 * possible DNS lookups in getnetbyname().
3212 */
3213 if (isxdigit(*cp) || *cp == ':') {
3214 memset(&hints, 0, sizeof hints);
3215 /* Ensure the mask and the network have the same family. */
3216 if (maskflg && (opt_flags & OP_NET))
3217 hints.ai_family = net->nt_net.ss_family;
3218 else if (!maskflg && (opt_flags & OP_HAVEMASK))
3219 hints.ai_family = net->nt_mask.ss_family;
3220 else
3221 hints.ai_family = AF_UNSPEC;
3222 hints.ai_flags = AI_NUMERICHOST;
3223 if (getaddrinfo(cp, NULL, &hints, &ai) == 0)
3224 sa = ai->ai_addr;
3225 if (sa != NULL && ai->ai_family == AF_INET) {
3226 /*
3227 * The address in `cp' is really a network address, so
3228 * use inet_network() to re-interpret this correctly.
3229 * e.g. "127.1" means 127.1.0.0, not 127.0.0.1.
3230 */
3231 bzero(&sin, sizeof sin);
3232 sin.sin_family = AF_INET;
3233 sin.sin_len = sizeof sin;
3234 sin.sin_addr = inet_makeaddr(inet_network(cp), 0);
3235 if (debug)
3236 fprintf(stderr, "get_net: v4 addr %s\n",
3237 inet_ntoa(sin.sin_addr));
3238 sa = (struct sockaddr *)&sin;
3239 }
3240 }
3241 if (sa == NULL && (np = getnetbyname(cp)) != NULL) {
3242 bzero(&sin, sizeof sin);
3243 sin.sin_family = AF_INET;
3244 sin.sin_len = sizeof sin;
3245 sin.sin_addr = inet_makeaddr(np->n_net, 0);
3246 sa = (struct sockaddr *)&sin;
3247 }
3248 if (sa == NULL)
3249 goto fail;
3250
3251 if (maskflg) {
3252 /* The specified sockaddr is a mask. */
3253 if (checkmask(sa) != 0)
3254 goto fail;
3255 bcopy(sa, &net->nt_mask, sa->sa_len);
3256 opt_flags |= OP_HAVEMASK;
3257 } else {
3258 /* The specified sockaddr is a network address. */
3259 bcopy(sa, &net->nt_net, sa->sa_len);
3260
3261 /* Get a network name for the export list. */
3262 if (np) {
3263 name = np->n_name;
3264 } else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname,
3265 NULL, 0, NI_NUMERICHOST) == 0) {
3266 name = netname;
3267 } else {
3268 goto fail;
3269 }
3270 if ((net->nt_name = strdup(name)) == NULL)
3271 out_of_mem();
3272
3273 /*
3274 * Extract a mask from either a "/<masklen>" suffix, or
3275 * from the class of an IPv4 address.
3276 */
3277 if (opt_flags & OP_MASKLEN) {
3278 preflen = strtol(prefp, NULL, 10);
3279 if (preflen < 0L || preflen == LONG_MAX)
3280 goto fail;
3281 bcopy(sa, &net->nt_mask, sa->sa_len);
3282 if (makemask(&net->nt_mask, (int)preflen) != 0)
3283 goto fail;
3284 opt_flags |= OP_HAVEMASK;
3285 *p = '/';
3286 } else if (sa->sa_family == AF_INET &&
3287 (opt_flags & OP_MASK) == 0) {
3288 in_addr_t addr;
3289
3290 addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
3291 if (IN_CLASSA(addr))
3292 preflen = 8;
3293 else if (IN_CLASSB(addr))
3294 preflen = 16;
3295 else if (IN_CLASSC(addr))
3296 preflen = 24;
3297 else if (IN_CLASSD(addr))
3298 preflen = 28;
3299 else
3300 preflen = 32; /* XXX */
3301
3302 bcopy(sa, &net->nt_mask, sa->sa_len);
3303 makemask(&net->nt_mask, (int)preflen);
3304 opt_flags |= OP_HAVEMASK;
3305 }
3306 }
3307
3308 if (ai)
3309 freeaddrinfo(ai);
3310 return 0;
3311
3312 fail:
3313 if (ai)
3314 freeaddrinfo(ai);
3315 return 1;
3316 }
3317
3318 /*
3319 * Parse out the next white space separated field
3320 */
3321 static void
nextfield(char ** cp,char ** endcp)3322 nextfield(char **cp, char **endcp)
3323 {
3324 char *p;
3325 char quot = 0;
3326
3327 p = *cp;
3328 while (*p == ' ' || *p == '\t')
3329 p++;
3330 *cp = p;
3331 while (*p != '\0') {
3332 if (quot) {
3333 if (*p == quot)
3334 quot = 0;
3335 } else {
3336 if (*p == '\\' && *(p + 1) != '\0')
3337 p++;
3338 else if (*p == '\'' || *p == '"')
3339 quot = *p;
3340 else if (*p == ' ' || *p == '\t')
3341 break;
3342 }
3343 p++;
3344 };
3345 *endcp = p;
3346 }
3347
3348 /*
3349 * Get an exports file line. Skip over blank lines and handle line
3350 * continuations.
3351 */
3352 static int
get_line(void)3353 get_line(void)
3354 {
3355 char *p, *cp;
3356 size_t len;
3357 int totlen, cont_line;
3358
3359 /*
3360 * Loop around ignoring blank lines and getting all continuation lines.
3361 */
3362 p = line;
3363 totlen = 0;
3364 do {
3365 if ((p = fgetln(exp_file, &len)) == NULL)
3366 return (0);
3367 cp = p + len - 1;
3368 cont_line = 0;
3369 while (cp >= p &&
3370 (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) {
3371 if (*cp == '\\')
3372 cont_line = 1;
3373 cp--;
3374 len--;
3375 }
3376 if (cont_line) {
3377 *++cp = ' ';
3378 len++;
3379 }
3380 if (linesize < len + totlen + 1) {
3381 linesize = len + totlen + 1;
3382 line = realloc(line, linesize);
3383 if (line == NULL)
3384 out_of_mem();
3385 }
3386 memcpy(line + totlen, p, len);
3387 totlen += len;
3388 line[totlen] = '\0';
3389 } while (totlen == 0 || cont_line);
3390 return (1);
3391 }
3392
3393 /*
3394 * Parse a description of a credential.
3395 */
3396 static void
parsecred(char * namelist,struct xucred * cr)3397 parsecred(char *namelist, struct xucred *cr)
3398 {
3399 char *name;
3400 int cnt;
3401 char *names;
3402 struct passwd *pw;
3403 struct group *gr;
3404 gid_t groups[XU_NGROUPS + 1];
3405 int ngroups;
3406
3407 cr->cr_version = XUCRED_VERSION;
3408 /*
3409 * Set up the unprivileged user.
3410 */
3411 cr->cr_uid = 65534;
3412 cr->cr_groups[0] = 65533;
3413 cr->cr_ngroups = 1;
3414 /*
3415 * Get the user's password table entry.
3416 */
3417 names = namelist;
3418 name = strsep_quote(&names, ":");
3419 /* Bug? name could be NULL here */
3420 if (isdigit(*name) || *name == '-')
3421 pw = getpwuid(atoi(name));
3422 else
3423 pw = getpwnam(name);
3424 /*
3425 * Credentials specified as those of a user.
3426 */
3427 if (names == NULL) {
3428 if (pw == NULL) {
3429 syslog(LOG_ERR, "unknown user: %s", name);
3430 return;
3431 }
3432 cr->cr_uid = pw->pw_uid;
3433 ngroups = XU_NGROUPS + 1;
3434 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups)) {
3435 syslog(LOG_ERR, "too many groups");
3436 ngroups = XU_NGROUPS + 1;
3437 }
3438
3439 /*
3440 * Compress out duplicate.
3441 */
3442 cr->cr_ngroups = ngroups - 1;
3443 cr->cr_groups[0] = groups[0];
3444 for (cnt = 2; cnt < ngroups; cnt++)
3445 cr->cr_groups[cnt - 1] = groups[cnt];
3446 return;
3447 }
3448 /*
3449 * Explicit credential specified as a colon separated list:
3450 * uid:gid:gid:...
3451 */
3452 if (pw != NULL)
3453 cr->cr_uid = pw->pw_uid;
3454 else if (isdigit(*name) || *name == '-')
3455 cr->cr_uid = atoi(name);
3456 else {
3457 syslog(LOG_ERR, "unknown user: %s", name);
3458 return;
3459 }
3460 cr->cr_ngroups = 0;
3461 while (names != NULL && *names != '\0' && cr->cr_ngroups < XU_NGROUPS) {
3462 name = strsep_quote(&names, ":");
3463 if (isdigit(*name) || *name == '-') {
3464 cr->cr_groups[cr->cr_ngroups++] = atoi(name);
3465 } else {
3466 if ((gr = getgrnam(name)) == NULL) {
3467 syslog(LOG_ERR, "unknown group: %s", name);
3468 continue;
3469 }
3470 cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid;
3471 }
3472 }
3473 if (names != NULL && *names != '\0' && cr->cr_ngroups == XU_NGROUPS)
3474 syslog(LOG_ERR, "too many groups");
3475 }
3476
3477 #define STRSIZ (MNTNAMLEN+MNTPATHLEN+50)
3478 /*
3479 * Routines that maintain the remote mounttab
3480 */
3481 static void
get_mountlist(void)3482 get_mountlist(void)
3483 {
3484 struct mountlist *mlp;
3485 char *host, *dirp, *cp;
3486 char str[STRSIZ];
3487 FILE *mlfile;
3488
3489 if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) {
3490 if (errno == ENOENT)
3491 return;
3492 else {
3493 syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST);
3494 return;
3495 }
3496 }
3497 while (fgets(str, STRSIZ, mlfile) != NULL) {
3498 cp = str;
3499 host = strsep(&cp, " \t\n");
3500 dirp = strsep(&cp, " \t\n");
3501 if (host == NULL || dirp == NULL)
3502 continue;
3503 mlp = (struct mountlist *)malloc(sizeof (*mlp));
3504 if (mlp == (struct mountlist *)NULL)
3505 out_of_mem();
3506 strncpy(mlp->ml_host, host, MNTNAMLEN);
3507 mlp->ml_host[MNTNAMLEN] = '\0';
3508 strncpy(mlp->ml_dirp, dirp, MNTPATHLEN);
3509 mlp->ml_dirp[MNTPATHLEN] = '\0';
3510
3511 SLIST_INSERT_HEAD(&mlhead, mlp, next);
3512 }
3513 fclose(mlfile);
3514 }
3515
3516 static void
del_mlist(char * hostp,char * dirp)3517 del_mlist(char *hostp, char *dirp)
3518 {
3519 struct mountlist *mlp, *mlp2;
3520 FILE *mlfile;
3521 int fnd = 0;
3522
3523 SLIST_FOREACH_SAFE(mlp, &mlhead, next, mlp2) {
3524 if (!strcmp(mlp->ml_host, hostp) &&
3525 (!dirp || !strcmp(mlp->ml_dirp, dirp))) {
3526 fnd = 1;
3527 SLIST_REMOVE(&mlhead, mlp, mountlist, next);
3528 free((caddr_t)mlp);
3529 }
3530 }
3531 if (fnd) {
3532 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) {
3533 syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST);
3534 return;
3535 }
3536 SLIST_FOREACH(mlp, &mlhead, next) {
3537 fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
3538 }
3539 fclose(mlfile);
3540 }
3541 }
3542
3543 static void
add_mlist(char * hostp,char * dirp)3544 add_mlist(char *hostp, char *dirp)
3545 {
3546 struct mountlist *mlp;
3547 FILE *mlfile;
3548
3549 SLIST_FOREACH(mlp, &mlhead, next) {
3550 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp))
3551 return;
3552 }
3553
3554 mlp = (struct mountlist *)malloc(sizeof (*mlp));
3555 if (mlp == (struct mountlist *)NULL)
3556 out_of_mem();
3557 strncpy(mlp->ml_host, hostp, MNTNAMLEN);
3558 mlp->ml_host[MNTNAMLEN] = '\0';
3559 strncpy(mlp->ml_dirp, dirp, MNTPATHLEN);
3560 mlp->ml_dirp[MNTPATHLEN] = '\0';
3561 SLIST_INSERT_HEAD(&mlhead, mlp, next);
3562 if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
3563 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST);
3564 return;
3565 }
3566 fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
3567 fclose(mlfile);
3568 }
3569
3570 /*
3571 * Free up a group list.
3572 */
3573 static void
free_grp(struct grouplist * grp)3574 free_grp(struct grouplist *grp)
3575 {
3576 if (grp->gr_type == GT_HOST) {
3577 if (grp->gr_ptr.gt_addrinfo != NULL)
3578 freeaddrinfo(grp->gr_ptr.gt_addrinfo);
3579 } else if (grp->gr_type == GT_NET) {
3580 if (grp->gr_ptr.gt_net.nt_name)
3581 free(grp->gr_ptr.gt_net.nt_name);
3582 }
3583 free((caddr_t)grp);
3584 }
3585
3586 #ifdef DEBUG
3587 static void
SYSLOG(int pri,const char * fmt,...)3588 SYSLOG(int pri, const char *fmt, ...)
3589 {
3590 va_list ap;
3591
3592 va_start(ap, fmt);
3593 vfprintf(stderr, fmt, ap);
3594 va_end(ap);
3595 }
3596 #endif /* DEBUG */
3597
3598 /*
3599 * Check options for consistency.
3600 */
3601 static int
check_options(struct dirlist * dp)3602 check_options(struct dirlist *dp)
3603 {
3604
3605 if (v4root_phase == 0 && dp == NULL)
3606 return (1);
3607 if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL)) {
3608 syslog(LOG_ERR, "-mapall and -maproot mutually exclusive");
3609 return (1);
3610 }
3611 if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) {
3612 syslog(LOG_ERR, "-mask requires -network");
3613 return (1);
3614 }
3615 if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) {
3616 syslog(LOG_ERR, "-network requires mask specification");
3617 return (1);
3618 }
3619 if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) {
3620 syslog(LOG_ERR, "-mask and /masklen are mutually exclusive");
3621 return (1);
3622 }
3623 if (v4root_phase > 0 &&
3624 (opt_flags &
3625 ~(OP_SEC | OP_MASK | OP_NET | OP_HAVEMASK | OP_MASKLEN)) != 0) {
3626 syslog(LOG_ERR,"only -sec,-net,-mask options allowed on V4:");
3627 return (1);
3628 }
3629 if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
3630 syslog(LOG_ERR, "-alldirs has multiple directories");
3631 return (1);
3632 }
3633 return (0);
3634 }
3635
3636 /*
3637 * Check an absolute directory path for any symbolic links. Return true
3638 */
3639 static int
check_dirpath(char * dirp)3640 check_dirpath(char *dirp)
3641 {
3642 char *cp;
3643 int ret = 1;
3644 struct stat sb;
3645
3646 cp = dirp + 1;
3647 while (*cp && ret) {
3648 if (*cp == '/') {
3649 *cp = '\0';
3650 if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
3651 ret = 0;
3652 *cp = '/';
3653 }
3654 cp++;
3655 }
3656 if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
3657 ret = 0;
3658 return (ret);
3659 }
3660
3661 /*
3662 * Make a netmask according to the specified prefix length. The ss_family
3663 * and other non-address fields must be initialised before calling this.
3664 */
3665 static int
makemask(struct sockaddr_storage * ssp,int bitlen)3666 makemask(struct sockaddr_storage *ssp, int bitlen)
3667 {
3668 u_char *p;
3669 int bits, i, len;
3670
3671 if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL)
3672 return (-1);
3673 if (bitlen > len * CHAR_BIT)
3674 return (-1);
3675
3676 for (i = 0; i < len; i++) {
3677 bits = MIN(CHAR_BIT, bitlen);
3678 *p++ = (u_char)~0 << (CHAR_BIT - bits);
3679 bitlen -= bits;
3680 }
3681 return 0;
3682 }
3683
3684 /*
3685 * Check that the sockaddr is a valid netmask. Returns 0 if the mask
3686 * is acceptable (i.e. of the form 1...10....0).
3687 */
3688 static int
checkmask(struct sockaddr * sa)3689 checkmask(struct sockaddr *sa)
3690 {
3691 u_char *mask;
3692 int i, len;
3693
3694 if ((mask = sa_rawaddr(sa, &len)) == NULL)
3695 return (-1);
3696
3697 for (i = 0; i < len; i++)
3698 if (mask[i] != 0xff)
3699 break;
3700 if (i < len) {
3701 if (~mask[i] & (u_char)(~mask[i] + 1))
3702 return (-1);
3703 i++;
3704 }
3705 for (; i < len; i++)
3706 if (mask[i] != 0)
3707 return (-1);
3708 return (0);
3709 }
3710
3711 /*
3712 * Compare two sockaddrs according to a specified mask. Return zero if
3713 * `sa1' matches `sa2' when filtered by the netmask in `samask'.
3714 * If samask is NULL, perform a full comparison.
3715 */
3716 static int
sacmp(struct sockaddr * sa1,struct sockaddr * sa2,struct sockaddr * samask)3717 sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask)
3718 {
3719 unsigned char *p1, *p2, *mask;
3720 int len, i;
3721
3722 if (sa1->sa_family != sa2->sa_family ||
3723 (p1 = sa_rawaddr(sa1, &len)) == NULL ||
3724 (p2 = sa_rawaddr(sa2, NULL)) == NULL)
3725 return (1);
3726
3727 switch (sa1->sa_family) {
3728 case AF_INET6:
3729 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
3730 ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
3731 return (1);
3732 break;
3733 }
3734
3735 /* Simple binary comparison if no mask specified. */
3736 if (samask == NULL)
3737 return (memcmp(p1, p2, len));
3738
3739 /* Set up the mask, and do a mask-based comparison. */
3740 if (sa1->sa_family != samask->sa_family ||
3741 (mask = sa_rawaddr(samask, NULL)) == NULL)
3742 return (1);
3743
3744 for (i = 0; i < len; i++)
3745 if ((p1[i] & mask[i]) != (p2[i] & mask[i]))
3746 return (1);
3747 return (0);
3748 }
3749
3750 /*
3751 * Return a pointer to the part of the sockaddr that contains the
3752 * raw address, and set *nbytes to its length in bytes. Returns
3753 * NULL if the address family is unknown.
3754 */
3755 static void *
sa_rawaddr(struct sockaddr * sa,int * nbytes)3756 sa_rawaddr(struct sockaddr *sa, int *nbytes) {
3757 void *p;
3758 int len;
3759
3760 switch (sa->sa_family) {
3761 case AF_INET:
3762 len = sizeof(((struct sockaddr_in *)sa)->sin_addr);
3763 p = &((struct sockaddr_in *)sa)->sin_addr;
3764 break;
3765 case AF_INET6:
3766 len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr);
3767 p = &((struct sockaddr_in6 *)sa)->sin6_addr;
3768 break;
3769 default:
3770 p = NULL;
3771 len = 0;
3772 }
3773
3774 if (nbytes != NULL)
3775 *nbytes = len;
3776 return (p);
3777 }
3778
3779 static void
huphandler(int sig __unused)3780 huphandler(int sig __unused)
3781 {
3782
3783 got_sighup = 1;
3784 }
3785
3786 static void
terminate(int sig __unused)3787 terminate(int sig __unused)
3788 {
3789 pidfile_remove(pfh);
3790 rpcb_unset(MOUNTPROG, MOUNTVERS, NULL);
3791 rpcb_unset(MOUNTPROG, MOUNTVERS3, NULL);
3792 exit (0);
3793 }
3794