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world: Mark utilities that use out of bounds copies.
[dragonfly.git] / sbin / mountd / mountd.c
blob9b6293d916246dd0e6bd85c343a83292515c0384
1 /*
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Herb Hasler and Rick Macklem at The University of Guelph.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * @(#) Copyright (c) 1989, 1993 The Regents of the University of California. All rights reserved.
33 * @(#)mountd.c 8.15 (Berkeley) 5/1/95
34 * $FreeBSD: head/usr.sbin/mountd/mountd.c 173056 2007-10-27 12:24:47Z simon $
35 */
36
37 #include <sys/param.h>
38 #include <sys/module.h>
39 #include <sys/mount.h>
40 #include <sys/mountctl.h>
41 #include <sys/fcntl.h>
42 #include <sys/linker.h>
43 #include <sys/stat.h>
44 #include <sys/syslog.h>
45 #include <sys/sysctl.h>
46
47 #include <rpc/rpc.h>
48 #include <rpc/rpc_com.h>
49 #include <rpcsvc/mount.h>
50 #include <vfs/nfs/rpcv2.h>
51 #include <vfs/nfs/nfsproto.h>
52 #include <vfs/nfs/nfs.h>
53 #include <vfs/ufs/ufsmount.h>
54 #include <vfs/msdosfs/msdosfsmount.h>
55 #include <vfs/ntfs/ntfsmount.h>
56 #include <vfs/isofs/cd9660/cd9660_mount.h> /* XXX need isofs in include */
57
58 #include <arpa/inet.h>
59
60 #include <ctype.h>
61 #include <err.h>
62 #include <errno.h>
63 #include <grp.h>
64 #include <limits.h>
65 #include <libutil.h>
66 #include <netdb.h>
67 #include <pwd.h>
68 #include <signal.h>
69 #include <stdio.h>
70 #include <stdlib.h>
71 #include <string.h>
72 #include <unistd.h>
73 #include "pathnames.h"
74
75 #ifdef DEBUG
76 #include <stdarg.h>
77 #endif
78
79 /*
80 * Structures for keeping the mount list and export list
81 */
82 struct mountlist {
83 struct mountlist *ml_next;
84 char ml_host[RPCMNT_NAMELEN+1];
85 char ml_dirp[RPCMNT_PATHLEN+1];
86 };
87
88 struct dirlist {
89 struct dirlist *dp_left;
90 struct dirlist *dp_right;
91 int dp_flag;
92 struct hostlist *dp_hosts; /* List of hosts this dir exported to */
93 char *dp_dirp;
94 };
95 /* dp_flag bits */
96 #define DP_DEFSET 0x1
97 #define DP_HOSTSET 0x2
98
99 struct exportlist {
100 struct exportlist *ex_next;
101 struct dirlist *ex_dirl;
102 struct dirlist *ex_defdir;
103 int ex_flag;
104 fsid_t ex_fs;
105 char *ex_fsdir;
106 char *ex_indexfile;
107 };
108 /* ex_flag bits */
109 #define EX_LINKED 0x1
110
111 struct netmsk {
112 struct sockaddr_storage nt_net;
113 struct sockaddr_storage nt_mask;
114 char *nt_name;
115 };
116
117 union grouptypes {
118 struct addrinfo *gt_addrinfo;
119 struct netmsk gt_net;
120 };
121
122 struct grouplist {
123 int gr_type;
124 union grouptypes gr_ptr;
125 struct grouplist *gr_next;
126 };
127 /* Group types */
128 #define GT_NULL 0x0
129 #define GT_HOST 0x1
130 #define GT_NET 0x2
131 #define GT_DEFAULT 0x3
132 #define GT_IGNORE 0x5
133
134 struct hostlist {
135 int ht_flag; /* Uses DP_xx bits */
136 struct grouplist *ht_grp;
137 struct hostlist *ht_next;
138 };
139
140 struct fhreturn {
141 int fhr_flag;
142 int fhr_vers;
143 nfsfh_t fhr_fh;
144 };
145
146 /* Global defs */
147 char *add_expdir(struct dirlist **, char *, int);
148 void add_dlist(struct dirlist **, struct dirlist *,
149 struct grouplist *, int);
150 void add_mlist(char *, char *);
151 int check_dirpath(char *);
152 int check_options(struct dirlist *);
153 int checkmask(struct sockaddr *sa);
154 int chk_host(struct dirlist *, struct sockaddr *, int *, int *);
155 void create_service(struct netconfig *nconf);
156 void del_mlist(char *, char *);
157 struct dirlist *dirp_search(struct dirlist *, char *);
158 int do_mount(struct exportlist *, struct grouplist *, int,
159 struct ucred *, char *, int, struct statfs *);
160 int do_opt(char **, char **, struct exportlist *, struct grouplist *,
161 int *, int *, struct ucred *);
162 struct exportlist *ex_search(fsid_t *);
163 struct exportlist *get_exp(void);
164 void free_dir(struct dirlist *);
165 void free_exp(struct exportlist *);
166 void free_grp(struct grouplist *);
167 void free_host(struct hostlist *);
168 void get_exportlist(int incremental);
169 int get_host(char *, struct grouplist *, struct grouplist *);
170 struct hostlist *get_ht(void);
171 int get_line(void);
172 void get_mountlist(void);
173 static void delete_export(struct statfs *fsp);
174 int get_net(char *, struct netmsk *, int);
175 void getexp_err(struct exportlist *, struct grouplist *);
176 struct grouplist *get_grp(void);
177 void hang_dirp(struct dirlist *, struct grouplist *,
178 struct exportlist *, int);
179 void huphandler1(int sig);
180 void huphandler2(int sig);
181 int makemask(struct sockaddr_storage *ssp, int bitlen);
182 void mntsrv(struct svc_req *, SVCXPRT *);
183 void nextfield(char **, char **);
184 void out_of_mem(void) __dead2;
185 void parsecred(char *, struct ucred *);
186 int put_exlist(struct dirlist *, XDR *, struct dirlist *, int *, int);
187 void *sa_rawaddr(struct sockaddr *sa, int *nbytes);
188 int sacmp(struct sockaddr *sa1, struct sockaddr *sa2,
189 struct sockaddr *samask);
190 int scan_tree(struct dirlist *, struct sockaddr *);
191 static void usage(void);
192 int xdr_dir(XDR *, char *);
193 int xdr_explist(XDR *, caddr_t);
194 int xdr_explist_brief(XDR *, caddr_t);
195 int xdr_explist_common(XDR *, caddr_t, int);
196 int xdr_fhs(XDR *, caddr_t);
197 int xdr_mlist(XDR *, caddr_t);
198 void terminate(int) __dead2;
199
200 struct exportlist *exphead;
201 struct mountlist *mlhead;
202 struct grouplist *grphead;
203 char *exnames_default[2] = { _PATH_EXPORTS, NULL };
204 char **exnames;
205 char **hosts = NULL;
206 struct ucred def_anon;
207 int force_v2 = 0;
208 int resvport_only = 1;
209 int nhosts = 0;
210 int dir_only = 1;
211 int dolog = 0;
212 int got_sighup1 = 0;
213 int got_sighup2 = 0;
214
215 int xcreated = 0;
216 char *svcport_str = NULL;
217 int opt_flags;
218 static int have_v6 = 1;
219
220 struct pidfh *pfh = NULL;
221 /* Bits for the opt_flags above */
222 #define OP_MAPROOT 0x01
223 #define OP_MAPALL 0x02
224 /* 0x4 free */
225 #define OP_MASK 0x08
226 #define OP_NET 0x10
227 #define OP_ALLDIRS 0x40
228 #define OP_HAVEMASK 0x80 /* A mask was specified or inferred. */
229 #define OP_QUIET 0x100
230 #define OP_MASKLEN 0x200
231
232 #ifdef DEBUG
233 int debug = 1;
234 void SYSLOG(int, const char *, ...);
235 #define syslog SYSLOG
236 #else
237 int debug = 0;
238 #endif
239
240 /*
241 * Mountd server for NFS mount protocol as described in:
242 * NFS: Network File System Protocol Specification, RFC1094, Appendix A
243 * The optional arguments are the exports file name
244 * default: _PATH_EXPORTS
245 * and "-n" to allow nonroot mount.
246 */
247 int
248 main(int argc, char **argv)
249 {
250 fd_set readfds;
251 struct netconfig *nconf;
252 char *endptr, **hosts_bak;
253 void *nc_handle;
254 pid_t otherpid;
255 in_port_t svcport;
256 int c, k, s;
257 int maxrec = RPC_MAXDATASIZE;
258
259 def_anon.cr_ref = 1;
260 def_anon.cr_uid = (uid_t)65534;
261 def_anon.cr_ngroups = 1;
262 def_anon.cr_groups[0] = (gid_t)65533;
263
264 /* Check that another mountd isn't already running. */
265 pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &otherpid);
266 if (pfh == NULL) {
267 if (errno == EEXIST)
268 errx(1, "mountd already running, pid: %d.", otherpid);
269 warn("cannot open or create pidfile");
270 }
271
272 s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
273 if (s < 0)
274 have_v6 = 0;
275 else
276 close(s);
277 if (modfind("nfs") < 0) {
278 /* Not present in kernel, try loading it */
279 if (kldload("nfs") < 0 || modfind("nfs") < 0)
280 errx(1, "NFS server is not available or loadable");
281 }
282
283 while ((c = getopt(argc, argv, "2dh:lnp:r")) != -1) {
284 switch (c) {
285 case '2':
286 force_v2 = 1;
287 break;
288 case 'n':
289 resvport_only = 0;
290 break;
291 case 'r':
292 dir_only = 0;
293 break;
294 case 'd':
295 debug = debug ? 0 : 1;
296 break;
297 case 'l':
298 dolog = 1;
299 break;
300 case 'p':
301 endptr = NULL;
302 svcport = (in_port_t)strtoul(optarg, &endptr, 10);
303 if (endptr == NULL || *endptr != '\0' ||
304 svcport == 0 || svcport >= IPPORT_MAX)
305 usage();
306 svcport_str = strdup(optarg);
307 break;
308 case 'h':
309 ++nhosts;
310 hosts_bak = hosts;
311 hosts_bak = realloc(hosts, nhosts * sizeof(char *));
312 if (hosts_bak == NULL) {
313 if (hosts != NULL) {
314 for (k = 0; k < nhosts; k++)
315 free(hosts[k]);
316 free(hosts);
317 out_of_mem();
318 }
319 }
320 hosts = hosts_bak;
321 hosts[nhosts - 1] = strdup(optarg);
322 if (hosts[nhosts - 1] == NULL) {
323 for (k = 0; k < (nhosts - 1); k++)
324 free(hosts[k]);
325 free(hosts);
326 out_of_mem();
327 }
328 break;
329 default:
330 usage();
331 }
332 }
333 if (debug == 0) {
334 daemon(0, 0);
335 signal(SIGINT, SIG_IGN);
336 signal(SIGQUIT, SIG_IGN);
337 }
338 argc -= optind;
339 argv += optind;
340 grphead = NULL;
341 exphead = NULL;
342 mlhead = NULL;
343 if (argc > 0)
344 exnames = argv;
345 else
346 exnames = exnames_default;
347 openlog("mountd", LOG_PID, LOG_DAEMON);
348 if (debug)
349 warnx("getting export list");
350 get_exportlist(0);
351 if (debug)
352 warnx("getting mount list");
353 get_mountlist();
354 if (debug)
355 warnx("here we go");
356 signal(SIGHUP, huphandler1);
357 signal(SIGUSR1, huphandler2);
358 signal(SIGTERM, terminate);
359 signal(SIGPIPE, SIG_IGN);
360
361 pidfile_write(pfh);
362
363 rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL);
364 rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL);
365
366 rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);
367
368 if (!resvport_only) {
369 if (sysctlbyname("vfs.nfs.nfs_privport", NULL, NULL,
370 &resvport_only, sizeof(resvport_only)) != 0 &&
371 errno != ENOENT) {
372 syslog(LOG_ERR, "sysctl: %m");
373 exit(1);
374 }
375 }
376
377 /*
378 * If no hosts were specified, add a wildcard entry to bind to
379 * INADDR_ANY. Otherwise make sure 127.0.0.1 and ::1 are added to the
380 * list.
381 */
382 if (nhosts == 0) {
383 hosts = malloc(sizeof(char *));
384 if (hosts == NULL)
385 out_of_mem();
386 hosts[0] = "*";
387 nhosts = 1;
388 } else {
389 hosts_bak = hosts;
390 if (have_v6) {
391 hosts_bak = realloc(hosts, (nhosts + 2) *
392 sizeof(char *));
393 if (hosts_bak == NULL) {
394 for (k = 0; k < nhosts; k++)
395 free(hosts[k]);
396 free(hosts);
397 out_of_mem();
398 } else
399 hosts = hosts_bak;
400 nhosts += 2;
401 hosts[nhosts - 2] = "::1";
402 } else {
403 hosts_bak = realloc(hosts, (nhosts + 1) * sizeof(char *));
404 if (hosts_bak == NULL) {
405 for (k = 0; k < nhosts; k++)
406 free(hosts[k]);
407 free(hosts);
408 out_of_mem();
409 } else {
410 nhosts += 1;
411 hosts = hosts_bak;
412 }
413 }
414 hosts[nhosts - 1] = "127.0.0.1";
415 }
416
417 nc_handle = setnetconfig();
418 while ((nconf = getnetconfig(nc_handle))) {
419 if (nconf->nc_flag & NC_VISIBLE) {
420 if (have_v6 == 0 && strcmp(nconf->nc_protofmly,
421 "inet6") == 0) {
422 /* DO NOTHING */
423 } else
424 create_service(nconf);
425 }
426 }
427 endnetconfig(nc_handle);
428
429 if (xcreated == 0) {
430 syslog(LOG_ERR, "could not create any services");
431 exit(1);
432 }
433
434 /* Expand svc_run() here so that we can call get_exportlist(). */
435 for (;;) {
436 if (got_sighup1) {
437 got_sighup1 = 0;
438 get_exportlist(0);
439 }
440 if (got_sighup2) {
441 got_sighup2 = 0;
442 get_exportlist(1);
443 }
444 readfds = svc_fdset;
445 switch (select(svc_maxfd + 1, &readfds, NULL, NULL, NULL)) {
446 case -1:
447 if (errno == EINTR)
448 continue;
449 syslog(LOG_ERR, "mountd died: select: %m");
450 exit(1);
451 case 0:
452 continue;
453 default:
454 svc_getreqset(&readfds);
455 }
456 }
457 }
458
459 /*
460 * This routine creates and binds sockets on the appropriate
461 * addresses. It gets called one time for each transport and
462 * registrates the service with rpcbind on that trasport.
463 */
464 void
465 create_service(struct netconfig *nconf)
466 {
467 struct addrinfo hints, *res = NULL;
468 struct sockaddr_in *sin;
469 struct sockaddr_in6 *sin6;
470 struct __rpc_sockinfo si;
471 struct netbuf servaddr;
472 SVCXPRT *transp = NULL;
473 int aicode;
474 int fd;
475 int nhostsbak;
476 int one = 1;
477 int r;
478 int registered = 0;
479 u_int32_t host_addr[4]; /* IPv4 or IPv6 */
480
481 if ((nconf->nc_semantics != NC_TPI_CLTS) &&
482 (nconf->nc_semantics != NC_TPI_COTS) &&
483 (nconf->nc_semantics != NC_TPI_COTS_ORD))
484 return; /* not my type */
485
486 /*
487 * XXX - using RPC library internal functions.
488 */
489 if (!__rpc_nconf2sockinfo(nconf, &si)) {
490 syslog(LOG_ERR, "cannot get information for %s",
491 nconf->nc_netid);
492 return;
493 }
494
495 /* Get mountd's address on this transport */
496 memset(&hints, 0, sizeof hints);
497 hints.ai_flags = AI_PASSIVE;
498 hints.ai_family = si.si_af;
499 hints.ai_socktype = si.si_socktype;
500 hints.ai_protocol = si.si_proto;
501
502 /*
503 * Bind to specific IPs if asked to
504 */
505 nhostsbak = nhosts;
506 while (nhostsbak > 0) {
507 --nhostsbak;
508 /*
509 * XXX - using RPC library internal functions.
510 */
511 if ((fd = __rpc_nconf2fd(nconf)) < 0) {
512 int non_fatal = 0;
513 if (errno == EPROTONOSUPPORT &&
514 nconf->nc_semantics != NC_TPI_CLTS)
515 non_fatal = 1;
516
517 syslog(non_fatal ? LOG_DEBUG : LOG_ERR,
518 "cannot create socket for %s", nconf->nc_netid);
519 return;
520 }
521
522 switch (hints.ai_family) {
523 case AF_INET:
524 if (inet_pton(AF_INET, hosts[nhostsbak],
525 host_addr) == 1) {
526 hints.ai_flags &= AI_NUMERICHOST;
527 } else {
528 /*
529 * Skip if we have an AF_INET6 address.
530 */
531 if (inet_pton(AF_INET6, hosts[nhostsbak],
532 host_addr) == 1) {
533 close(fd);
534 continue;
535 }
536 }
537 break;
538 case AF_INET6:
539 if (inet_pton(AF_INET6, hosts[nhostsbak],
540 host_addr) == 1) {
541 hints.ai_flags &= AI_NUMERICHOST;
542 } else {
543 /*
544 * Skip if we have an AF_INET address.
545 */
546 if (inet_pton(AF_INET, hosts[nhostsbak],
547 host_addr) == 1) {
548 close(fd);
549 continue;
550 }
551 }
552
553 /*
554 * We're doing host-based access checks here, so don't
555 * allow v4-in-v6 to confuse things. The kernel will
556 * disable it by default on NFS sockets too.
557 */
558 if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one,
559 sizeof one) < 0) {
560 syslog(LOG_ERR,
561 "can't disable v4-in-v6 on IPv6 socket");
562 exit(1);
563 }
564 break;
565 default:
566 break;
567 }
568
569 /*
570 * If no hosts were specified, just bind to INADDR_ANY
571 */
572 if (strcmp("*", hosts[nhostsbak]) == 0) {
573 if (svcport_str == NULL) {
574 res = malloc(sizeof(struct addrinfo));
575 if (res == NULL)
576 out_of_mem();
577 res->ai_flags = hints.ai_flags;
578 res->ai_family = hints.ai_family;
579 res->ai_protocol = hints.ai_protocol;
580 switch (res->ai_family) {
581 case AF_INET:
582 sin = malloc(sizeof(struct sockaddr_in));
583 if (sin == NULL)
584 out_of_mem();
585 sin->sin_family = AF_INET;
586 sin->sin_port = htons(0);
587 sin->sin_addr.s_addr = htonl(INADDR_ANY);
588 res->ai_addr = (struct sockaddr*) sin;
589 res->ai_addrlen = (socklen_t)
590 sizeof(res->ai_addr);
591 break;
592 case AF_INET6:
593 sin6 = malloc(sizeof(struct sockaddr_in6));
594 if (sin6 == NULL)
595 out_of_mem();
596 sin6->sin6_family = AF_INET6;
597 sin6->sin6_port = htons(0);
598 sin6->sin6_addr = in6addr_any;
599 res->ai_addr = (struct sockaddr*) sin6;
600 res->ai_addrlen = (socklen_t)
601 sizeof(res->ai_addr);
602 break;
603 default:
604 break;
605 }
606 } else {
607 if ((aicode = getaddrinfo(NULL, svcport_str,
608 &hints, &res)) != 0) {
609 syslog(LOG_ERR,
610 "cannot get local address for %s: %s",
611 nconf->nc_netid,
612 gai_strerror(aicode));
613 continue;
614 }
615 }
616 } else {
617 if ((aicode = getaddrinfo(hosts[nhostsbak], svcport_str,
618 &hints, &res)) != 0) {
619 syslog(LOG_ERR,
620 "cannot get local address for %s: %s",
621 nconf->nc_netid, gai_strerror(aicode));
622 continue;
623 }
624 }
625
626 {
627 int on = 1;
628
629 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
630 (char *)&on, sizeof(on));
631 }
632
633 r = bindresvport_sa(fd, res->ai_addr);
634 if (r != 0) {
635 syslog(LOG_ERR, "bindresvport_sa: %m");
636 exit(1);
637 }
638
639 if (nconf->nc_semantics != NC_TPI_CLTS)
640 listen(fd, SOMAXCONN);
641
642 if (nconf->nc_semantics == NC_TPI_CLTS )
643 transp = svc_dg_create(fd, 0, 0);
644 else
645 transp = svc_vc_create(fd, RPC_MAXDATASIZE,
646 RPC_MAXDATASIZE);
647
648 if (transp != NULL) {
649 if (!svc_reg(transp, RPCPROG_MNT, RPCMNT_VER1, mntsrv,
650 NULL))
651 syslog(LOG_ERR,
652 "can't register %s RPCMNT_VER1 service",
653 nconf->nc_netid);
654 if (!force_v2) {
655 if (!svc_reg(transp, RPCPROG_MNT, RPCMNT_VER3,
656 mntsrv, NULL))
657 syslog(LOG_ERR,
658 "can't register %s RPCMNT_VER3 service",
659 nconf->nc_netid);
660 }
661 } else
662 syslog(LOG_WARNING, "can't create %s services",
663 nconf->nc_netid);
664
665 if (registered == 0) {
666 registered = 1;
667 memset(&hints, 0, sizeof hints);
668 hints.ai_flags = AI_PASSIVE;
669 hints.ai_family = si.si_af;
670 hints.ai_socktype = si.si_socktype;
671 hints.ai_protocol = si.si_proto;
672
673 if (svcport_str == NULL) {
674 svcport_str = malloc(NI_MAXSERV * sizeof(char));
675 if (svcport_str == NULL)
676 out_of_mem();
677
678 if (getnameinfo(res->ai_addr,
679 res->ai_addr->sa_len, NULL, NI_MAXHOST,
680 svcport_str, NI_MAXSERV * sizeof(char),
681 NI_NUMERICHOST | NI_NUMERICSERV))
682 errx(1, "Cannot get port number");
683 }
684
685 if((aicode = getaddrinfo(NULL, svcport_str, &hints,
686 &res)) != 0) {
687 syslog(LOG_ERR, "cannot get local address: %s",
688 gai_strerror(aicode));
689 exit(1);
690 }
691
692 servaddr.buf = malloc(res->ai_addrlen);
693 memcpy(servaddr.buf, res->ai_addr, res->ai_addrlen);
694 servaddr.len = res->ai_addrlen;
695
696 rpcb_set(RPCPROG_MNT, RPCMNT_VER1, nconf, &servaddr);
697 rpcb_set(RPCPROG_MNT, RPCMNT_VER3, nconf, &servaddr);
698
699 xcreated++;
700 freeaddrinfo(res);
701 }
702 } /* end while */
703 }
704
705 static void
706 usage(void)
707 {
708 fprintf(stderr,
709 "usage: mountd [-2] [-d] [-l] [-n] [-p <port>] [-r] "
710 "[-h <bindip>] [export_file ...]\n");
711 exit(1);
712 }
713
714 /*
715 * The mount rpc service
716 */
717 void
718 mntsrv(struct svc_req *rqstp, SVCXPRT *transp)
719 {
720 struct exportlist *ep;
721 struct dirlist *dp;
722 struct fhreturn fhr;
723 struct stat stb;
724 struct statfs fsb;
725 char host[NI_MAXHOST], numerichost[NI_MAXHOST];
726 int lookup_failed = 1;
727 struct sockaddr *saddr;
728 u_short sport;
729 char rpcpath[RPCMNT_PATHLEN + 1], dirpath[MAXPATHLEN];
730 int bad = 0, defset, hostset;
731 sigset_t sighup_mask;
732
733 sigemptyset(&sighup_mask);
734 sigaddset(&sighup_mask, SIGHUP);
735
736 saddr = svc_getrpccaller(transp)->buf;
737 switch (saddr->sa_family) {
738 case AF_INET6:
739 sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port);
740 break;
741 case AF_INET:
742 sport = ntohs(((struct sockaddr_in *)saddr)->sin_port);
743 break;
744 default:
745 syslog(LOG_ERR, "request from unknown address family");
746 return;
747 }
748 lookup_failed = getnameinfo(saddr, saddr->sa_len, host, sizeof host,
749 NULL, 0, 0);
750 getnameinfo(saddr, saddr->sa_len, numerichost,
751 sizeof numerichost, NULL, 0, NI_NUMERICHOST);
752 switch (rqstp->rq_proc) {
753 case NULLPROC:
754 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
755 syslog(LOG_ERR, "can't send reply");
756 return;
757 case RPCMNT_MOUNT:
758 if (sport >= IPPORT_RESERVED && resvport_only) {
759 syslog(LOG_NOTICE,
760 "mount request from %s from unprivileged port",
761 numerichost);
762 svcerr_weakauth(transp);
763 return;
764 }
765 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
766 syslog(LOG_NOTICE, "undecodable mount request from %s",
767 numerichost);
768 svcerr_decode(transp);
769 return;
770 }
771
772 /*
773 * Get the real pathname and make sure it is a directory
774 * or a regular file if the -r option was specified
775 * and it exists.
776 */
777 if (realpath(rpcpath, dirpath) == NULL ||
778 stat(dirpath, &stb) < 0 ||
779 (!S_ISDIR(stb.st_mode) &&
780 (dir_only || !S_ISREG(stb.st_mode))) ||
781 statfs(dirpath, &fsb) < 0) {
782 chdir("/"); /* Just in case realpath doesn't */
783 syslog(LOG_NOTICE,
784 "mount request from %s for non existent path %s",
785 numerichost, dirpath);
786 if (debug)
787 warnx("stat failed on %s", dirpath);
788 bad = ENOENT; /* We will send error reply later */
789 }
790
791 /* Check in the exports list */
792 sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
793 ep = ex_search(&fsb.f_fsid);
794 hostset = defset = 0;
795 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset) ||
796 ((dp = dirp_search(ep->ex_dirl, dirpath)) &&
797 chk_host(dp, saddr, &defset, &hostset)) ||
798 (defset && scan_tree(ep->ex_defdir, saddr) == 0 &&
799 scan_tree(ep->ex_dirl, saddr) == 0))) {
800 if (bad) {
801 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
802 &bad))
803 syslog(LOG_ERR, "can't send reply");
804 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
805 return;
806 }
807 if (hostset & DP_HOSTSET)
808 fhr.fhr_flag = hostset;
809 else
810 fhr.fhr_flag = defset;
811 fhr.fhr_vers = rqstp->rq_vers;
812 /* Get the file handle */
813 memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t));
814 if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) {
815 bad = errno;
816 syslog(LOG_ERR, "can't get fh for %s", dirpath);
817 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
818 &bad))
819 syslog(LOG_ERR, "can't send reply");
820 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
821 return;
822 }
823 if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs, &fhr))
824 syslog(LOG_ERR, "can't send reply");
825 if (!lookup_failed)
826 add_mlist(host, dirpath);
827 else
828 add_mlist(numerichost, dirpath);
829 if (debug)
830 warnx("mount successful");
831 if (dolog)
832 syslog(LOG_NOTICE,
833 "mount request succeeded from %s for %s",
834 numerichost, dirpath);
835 } else {
836 bad = EACCES;
837 syslog(LOG_NOTICE,
838 "mount request denied from %s for %s",
839 numerichost, dirpath);
840 }
841
842 if (bad && !svc_sendreply(transp, (xdrproc_t)xdr_long, &bad))
843 syslog(LOG_ERR, "can't send reply");
844 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
845 return;
846 case RPCMNT_DUMP:
847 if (!svc_sendreply(transp, (xdrproc_t)xdr_mlist, NULL))
848 syslog(LOG_ERR, "can't send reply");
849 else if (dolog)
850 syslog(LOG_NOTICE,
851 "dump request succeeded from %s",
852 numerichost);
853 return;
854 case RPCMNT_UMOUNT:
855 if (sport >= IPPORT_RESERVED && resvport_only) {
856 syslog(LOG_NOTICE,
857 "umount request from %s from unprivileged port",
858 numerichost);
859 svcerr_weakauth(transp);
860 return;
861 }
862 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
863 syslog(LOG_NOTICE, "undecodable umount request from %s",
864 numerichost);
865 svcerr_decode(transp);
866 return;
867 }
868 if (realpath(rpcpath, dirpath) == NULL) {
869 syslog(LOG_NOTICE, "umount request from %s "
870 "for non existent path %s",
871 numerichost, dirpath);
872 }
873 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
874 syslog(LOG_ERR, "can't send reply");
875 if (!lookup_failed)
876 del_mlist(host, dirpath);
877 del_mlist(numerichost, dirpath);
878 if (dolog)
879 syslog(LOG_NOTICE,
880 "umount request succeeded from %s for %s",
881 numerichost, dirpath);
882 return;
883 case RPCMNT_UMNTALL:
884 if (sport >= IPPORT_RESERVED && resvport_only) {
885 syslog(LOG_NOTICE,
886 "umountall request from %s from unprivileged port",
887 numerichost);
888 svcerr_weakauth(transp);
889 return;
890 }
891 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
892 syslog(LOG_ERR, "can't send reply");
893 if (!lookup_failed)
894 del_mlist(host, NULL);
895 del_mlist(numerichost, NULL);
896 if (dolog)
897 syslog(LOG_NOTICE,
898 "umountall request succeeded from %s",
899 numerichost);
900 return;
901 case RPCMNT_EXPORT:
902 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, NULL))
903 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist_brief, NULL))
904 syslog(LOG_ERR, "can't send reply");
905 if (dolog)
906 syslog(LOG_NOTICE,
907 "export request succeeded from %s",
908 numerichost);
909 return;
910 default:
911 svcerr_noproc(transp);
912 return;
913 }
914 }
915
916 /*
917 * Xdr conversion for a dirpath string
918 */
919 int
920 xdr_dir(XDR *xdrsp, char *dirp)
921 {
922 return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
923 }
924
925 /*
926 * Xdr routine to generate file handle reply
927 */
928 int
929 xdr_fhs(XDR *xdrsp, caddr_t cp)
930 {
931 struct fhreturn *fhrp = (struct fhreturn *)cp;
932 long ok = 0, len, auth;
933
934 if (!xdr_long(xdrsp, &ok))
935 return (0);
936 switch (fhrp->fhr_vers) {
937 case 1:
938 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH));
939 case 3:
940 len = NFSX_V3FH;
941 if (!xdr_long(xdrsp, &len))
942 return (0);
943 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len))
944 return (0);
945 auth = RPCAUTH_UNIX;
946 len = 1;
947 if (!xdr_long(xdrsp, &len))
948 return (0);
949 return (xdr_long(xdrsp, &auth));
950 }
951 return (0);
952 }
953
954 int
955 xdr_mlist(XDR *xdrsp, caddr_t cp __unused)
956 {
957 struct mountlist *mlp;
958 int true = 1;
959 int false = 0;
960 char *strp;
961
962 mlp = mlhead;
963 while (mlp) {
964 if (!xdr_bool(xdrsp, &true))
965 return (0);
966 strp = &mlp->ml_host[0];
967 if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
968 return (0);
969 strp = &mlp->ml_dirp[0];
970 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
971 return (0);
972 mlp = mlp->ml_next;
973 }
974 if (!xdr_bool(xdrsp, &false))
975 return (0);
976 return (1);
977 }
978
979 /*
980 * Xdr conversion for export list
981 */
982 int
983 xdr_explist_common(XDR *xdrsp, caddr_t cp __unused, int brief)
984 {
985 struct exportlist *ep;
986 int false = 0;
987 int putdef;
988 sigset_t sighup_mask;
989
990 sigemptyset(&sighup_mask);
991 sigaddset(&sighup_mask, SIGHUP);
992 sigaddset(&sighup_mask, SIGUSR1);
993 sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
994 ep = exphead;
995 while (ep) {
996 putdef = 0;
997 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir,
998 &putdef, brief))
999 goto errout;
1000 if (ep->ex_defdir && putdef == 0 &&
1001 put_exlist(ep->ex_defdir, xdrsp, NULL,
1002 &putdef, brief))
1003 goto errout;
1004 ep = ep->ex_next;
1005 }
1006 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1007 if (!xdr_bool(xdrsp, &false))
1008 return (0);
1009 return (1);
1010 errout:
1011 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1012 return (0);
1013 }
1014
1015 /*
1016 * Called from xdr_explist() to traverse the tree and export the
1017 * directory paths.
1018 */
1019 int
1020 put_exlist(struct dirlist *dp, XDR *xdrsp, struct dirlist *adp, int *putdefp, int brief)
1021 {
1022 struct grouplist *grp;
1023 struct hostlist *hp;
1024 int true = 1;
1025 int false = 0;
1026 int gotalldir = 0;
1027 char *strp;
1028
1029 if (dp) {
1030 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp, brief))
1031 return (1);
1032 if (!xdr_bool(xdrsp, &true))
1033 return (1);
1034 strp = dp->dp_dirp;
1035 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
1036 return (1);
1037 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) {
1038 gotalldir = 1;
1039 *putdefp = 1;
1040 }
1041 if (brief) {
1042 if (!xdr_bool(xdrsp, &true))
1043 return (1);
1044 strp = "(...)";
1045 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
1046 return (1);
1047 } else if ((dp->dp_flag & DP_DEFSET) == 0 &&
1048 (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) {
1049 hp = dp->dp_hosts;
1050 while (hp) {
1051 grp = hp->ht_grp;
1052 if (grp->gr_type == GT_HOST) {
1053 if (!xdr_bool(xdrsp, &true))
1054 return (1);
1055 strp = grp->gr_ptr.gt_addrinfo->ai_canonname;
1056 if (!xdr_string(xdrsp, &strp,
1057 RPCMNT_NAMELEN))
1058 return (1);
1059 } else if (grp->gr_type == GT_NET) {
1060 if (!xdr_bool(xdrsp, &true))
1061 return (1);
1062 strp = grp->gr_ptr.gt_net.nt_name;
1063 if (!xdr_string(xdrsp, &strp,
1064 RPCMNT_NAMELEN))
1065 return (1);
1066 }
1067 hp = hp->ht_next;
1068 if (gotalldir && hp == NULL) {
1069 hp = adp->dp_hosts;
1070 gotalldir = 0;
1071 }
1072 }
1073 }
1074 if (!xdr_bool(xdrsp, &false))
1075 return (1);
1076 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp, brief))
1077 return (1);
1078 }
1079 return (0);
1080 }
1081
1082 int
1083 xdr_explist(XDR *xdrsp, caddr_t cp)
1084 {
1085
1086 return xdr_explist_common(xdrsp, cp, 0);
1087 }
1088
1089 int
1090 xdr_explist_brief(XDR *xdrsp, caddr_t cp)
1091 {
1092
1093 return xdr_explist_common(xdrsp, cp, 1);
1094 }
1095
1096 char *line;
1097 size_t linesize;
1098 FILE *exp_file;
1099
1100 /*
1101 * Get the export list from one, currently open file
1102 */
1103 static void
1104 get_exportlist_one(void)
1105 {
1106 struct exportlist *ep, *ep2;
1107 struct grouplist *grp, *tgrp;
1108 struct exportlist **epp;
1109 struct dirlist *dirhead;
1110 struct statfs fsb;
1111 struct ucred anon;
1112 char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc;
1113 int len, has_host, exflags, got_nondir, dirplen, netgrp;
1114
1115 dirhead = (struct dirlist *)NULL;
1116 while (get_line()) {
1117 if (debug)
1118 warnx("got line %s", line);
1119 cp = line;
1120 nextfield(&cp, &endcp);
1121 if (*cp == '#')
1122 goto nextline;
1123
1124 /*
1125 * Set defaults.
1126 */
1127 has_host = FALSE;
1128 anon = def_anon;
1129 exflags = MNT_EXPORTED;
1130 got_nondir = 0;
1131 opt_flags = 0;
1132 ep = NULL;
1133
1134 /*
1135 * Create new exports list entry
1136 */
1137 len = endcp-cp;
1138 tgrp = grp = get_grp();
1139 while (len > 0) {
1140 if (len > RPCMNT_NAMELEN) {
1141 getexp_err(ep, tgrp);
1142 goto nextline;
1143 }
1144 if (*cp == '-') {
1145 if (ep == NULL) {
1146 getexp_err(ep, tgrp);
1147 goto nextline;
1148 }
1149 if (debug)
1150 warnx("doing opt %s", cp);
1151 got_nondir = 1;
1152 if (do_opt(&cp, &endcp, ep, grp, &has_host,
1153 &exflags, &anon)) {
1154 getexp_err(ep, tgrp);
1155 goto nextline;
1156 }
1157 } else if (*cp == '/') {
1158 savedc = *endcp;
1159 *endcp = '\0';
1160 if (check_dirpath(cp) &&
1161 statfs(cp, &fsb) >= 0) {
1162 if ((fsb.f_flags & MNT_AUTOMOUNTED) != 0)
1163 syslog(LOG_ERR, "Warning: exporting of "
1164 "automounted fs %s not supported", cp);
1165 if (got_nondir) {
1166 syslog(LOG_ERR, "dirs must be first");
1167 getexp_err(ep, tgrp);
1168 goto nextline;
1169 }
1170 if (ep) {
1171 if (ep->ex_fs.val[0] != fsb.f_fsid.val[0] ||
1172 ep->ex_fs.val[1] != fsb.f_fsid.val[1]) {
1173 getexp_err(ep, tgrp);
1174 goto nextline;
1175 }
1176 } else {
1177 /*
1178 * See if this directory is already
1179 * in the list.
1180 */
1181 ep = ex_search(&fsb.f_fsid);
1182 if (ep == NULL) {
1183 ep = get_exp();
1184 ep->ex_fs = fsb.f_fsid;
1185 ep->ex_fsdir = strdup(fsb.f_mntonname);
1186 if (ep->ex_fsdir == NULL)
1187 out_of_mem();
1188
1189 delete_export(&fsb);
1190
1191 if (debug)
1192 warnx("making new ep fs=0x%x,0x%x",
1193 fsb.f_fsid.val[0],
1194 fsb.f_fsid.val[1]);
1195 } else if (debug)
1196 warnx("found ep fs=0x%x,0x%x",
1197 fsb.f_fsid.val[0],
1198 fsb.f_fsid.val[1]);
1199 }
1200
1201 /*
1202 * Add dirpath to export mount point.
1203 */
1204 dirp = add_expdir(&dirhead, cp, len);
1205 dirplen = len;
1206 } else {
1207 getexp_err(ep, tgrp);
1208 goto nextline;
1209 }
1210 *endcp = savedc;
1211 } else {
1212 savedc = *endcp;
1213 *endcp = '\0';
1214 got_nondir = 1;
1215 if (ep == NULL) {
1216 getexp_err(ep, tgrp);
1217 goto nextline;
1218 }
1219
1220 /*
1221 * Get the host or netgroup.
1222 */
1223 setnetgrent(cp);
1224 netgrp = getnetgrent(&hst, &usr, &dom);
1225 do {
1226 if (has_host) {
1227 grp->gr_next = get_grp();
1228 grp = grp->gr_next;
1229 }
1230 if (netgrp) {
1231 if (hst == NULL) {
1232 syslog(LOG_ERR,
1233 "null hostname in netgroup %s, skipping", cp);
1234 grp->gr_type = GT_IGNORE;
1235 } else if (get_host(hst, grp, tgrp)) {
1236 syslog(LOG_ERR,
1237 "bad host %s in netgroup %s, skipping", hst, cp);
1238 grp->gr_type = GT_IGNORE;
1239 }
1240 } else if (get_host(cp, grp, tgrp)) {
1241 syslog(LOG_ERR, "bad host %s, skipping", cp);
1242 grp->gr_type = GT_IGNORE;
1243 }
1244 has_host = TRUE;
1245 } while (netgrp && getnetgrent(&hst, &usr, &dom));
1246 endnetgrent();
1247 *endcp = savedc;
1248 }
1249 cp = endcp;
1250 nextfield(&cp, &endcp);
1251 len = endcp - cp;
1252 }
1253 if (check_options(dirhead)) {
1254 getexp_err(ep, tgrp);
1255 goto nextline;
1256 }
1257 if (!has_host) {
1258 grp->gr_type = GT_DEFAULT;
1259 if (debug)
1260 warnx("adding a default entry");
1261
1262 /*
1263 * Don't allow a network export coincide with a list of
1264 * host(s) on the same line.
1265 */
1266 } else if ((opt_flags & OP_NET) && tgrp->gr_next) {
1267 syslog(LOG_ERR, "network/host conflict");
1268 getexp_err(ep, tgrp);
1269 goto nextline;
1270
1271 /*
1272 * If an export list was specified on this line, make sure
1273 * that we have at least one valid entry, otherwise skip it.
1274 */
1275 } else {
1276 grp = tgrp;
1277 while (grp && grp->gr_type == GT_IGNORE)
1278 grp = grp->gr_next;
1279 if (! grp) {
1280 getexp_err(ep, tgrp);
1281 goto nextline;
1282 }
1283 }
1284
1285 /*
1286 * Loop through hosts, pushing the exports into the kernel.
1287 * After loop, tgrp points to the start of the list and
1288 * grp points to the last entry in the list.
1289 */
1290 grp = tgrp;
1291 do {
1292 if (do_mount(ep, grp, exflags, &anon, dirp, dirplen,
1293 &fsb)) {
1294 getexp_err(ep, tgrp);
1295 goto nextline;
1296 }
1297 } while (grp->gr_next && (grp = grp->gr_next));
1298
1299 /*
1300 * Success. Update the data structures.
1301 */
1302 if (has_host) {
1303 hang_dirp(dirhead, tgrp, ep, opt_flags);
1304 grp->gr_next = grphead;
1305 grphead = tgrp;
1306 } else {
1307 hang_dirp(dirhead, NULL, ep,
1308 opt_flags);
1309 free_grp(grp);
1310 }
1311 dirhead = NULL;
1312 if ((ep->ex_flag & EX_LINKED) == 0) {
1313 ep2 = exphead;
1314 epp = &exphead;
1315
1316 /*
1317 * Insert in the list in alphabetical order.
1318 */
1319 while (ep2 && strcmp(ep2->ex_fsdir, ep->ex_fsdir) < 0) {
1320 epp = &ep2->ex_next;
1321 ep2 = ep2->ex_next;
1322 }
1323 if (ep2)
1324 ep->ex_next = ep2;
1325 *epp = ep;
1326 ep->ex_flag |= EX_LINKED;
1327 }
1328 nextline:
1329 if (dirhead) {
1330 free_dir(dirhead);
1331 dirhead = NULL;
1332 }
1333 }
1334 fclose(exp_file);
1335 }
1336
1337 /*
1338 * Get the export list from all specified files.
1339 *
1340 * If incremental is non-zero we were signalled by mount and we do not
1341 * call mountctl() to blow away existing exports.
1342 */
1343 void
1344 get_exportlist(int incremental)
1345 {
1346 struct exportlist *ep, *ep2;
1347 struct grouplist *grp, *tgrp;
1348 struct statfs *fsp, *mntbufp;
1349 struct vfsconf vfc;
1350 int num, i;
1351 int done;
1352
1353 /*
1354 * First, get rid of the old list
1355 */
1356 ep = exphead;
1357 while (ep) {
1358 ep2 = ep;
1359 ep = ep->ex_next;
1360 free_exp(ep2);
1361 }
1362 exphead = NULL;
1363
1364 grp = grphead;
1365 while (grp) {
1366 tgrp = grp;
1367 grp = grp->gr_next;
1368 free_grp(tgrp);
1369 }
1370 grphead = NULL;
1371
1372 /*
1373 * And delete exports that are in the kernel for all local
1374 * filesystems.
1375 * XXX: Should know how to handle all local exportable filesystems.
1376 */
1377 num = getmntinfo(&mntbufp, MNT_NOWAIT);
1378 for (i = 0; i < num; i++) {
1379 fsp = &mntbufp[i];
1380 if (getvfsbyname(fsp->f_fstypename, &vfc) != 0) {
1381 syslog(LOG_ERR, "getvfsbyname() failed for %s",
1382 fsp->f_fstypename);
1383 continue;
1384 }
1385
1386 /*
1387 * Do not delete export for network filesystem by
1388 * passing "export" arg to mount().
1389 * It only makes sense to do this for local filesystems.
1390 */
1391 if (vfc.vfc_flags & VFCF_NETWORK)
1392 continue;
1393
1394 if (incremental == 0)
1395 delete_export(fsp);
1396 }
1397
1398 /*
1399 * Read in the exports file and build the list, calling
1400 * nmount() as we go along to push the export rules into the kernel.
1401 */
1402 done = 0;
1403 for (i = 0; exnames[i] != NULL; i++) {
1404 if (debug)
1405 warnx("reading exports from %s", exnames[i]);
1406 if ((exp_file = fopen(exnames[i], "r")) == NULL) {
1407 syslog(LOG_WARNING, "can't open %s", exnames[i]);
1408 continue;
1409 }
1410 get_exportlist_one();
1411 fclose(exp_file);
1412 done++;
1413 }
1414 if (done == 0) {
1415 syslog(LOG_ERR, "can't open any exports file");
1416 exit(2);
1417 }
1418 }
1419
1420 /*
1421 * Allocate an export list element
1422 */
1423 struct exportlist *
1424 get_exp(void)
1425 {
1426 struct exportlist *ep;
1427
1428 ep = (struct exportlist *)malloc(sizeof (struct exportlist));
1429 if (ep == NULL)
1430 out_of_mem();
1431 memset(ep, 0, sizeof(struct exportlist));
1432 return (ep);
1433 }
1434
1435 /*
1436 * Allocate a group list element
1437 */
1438 struct grouplist *
1439 get_grp(void)
1440 {
1441 struct grouplist *gp;
1442
1443 gp = (struct grouplist *)malloc(sizeof (struct grouplist));
1444 if (gp == NULL)
1445 out_of_mem();
1446 memset(gp, 0, sizeof(struct grouplist));
1447 return (gp);
1448 }
1449
1450 /*
1451 * Clean up upon an error in get_exportlist().
1452 */
1453 void
1454 getexp_err(struct exportlist *ep, struct grouplist *grp)
1455 {
1456 struct grouplist *tgrp;
1457
1458 if (!(opt_flags & OP_QUIET))
1459 syslog(LOG_ERR, "bad exports list line %s", line);
1460 if (ep && (ep->ex_flag & EX_LINKED) == 0)
1461 free_exp(ep);
1462 while (grp) {
1463 tgrp = grp;
1464 grp = grp->gr_next;
1465 free_grp(tgrp);
1466 }
1467 }
1468
1469 /*
1470 * Search the export list for a matching fs.
1471 */
1472 struct exportlist *
1473 ex_search(fsid_t *fsid)
1474 {
1475 struct exportlist *ep;
1476
1477 ep = exphead;
1478 while (ep) {
1479 if (ep->ex_fs.val[0] == fsid->val[0] &&
1480 ep->ex_fs.val[1] == fsid->val[1])
1481 return (ep);
1482 ep = ep->ex_next;
1483 }
1484 return (ep);
1485 }
1486
1487 /*
1488 * Add a directory path to the list.
1489 */
1490 char *
1491 add_expdir(struct dirlist **dpp, char *cp, int len)
1492 {
1493 struct dirlist *dp;
1494
1495 dp = malloc(sizeof (struct dirlist));
1496 if (dp == (struct dirlist *)NULL)
1497 out_of_mem();
1498 dp->dp_left = *dpp;
1499 dp->dp_right = (struct dirlist *)NULL;
1500 dp->dp_flag = 0;
1501 dp->dp_hosts = (struct hostlist *)NULL;
1502 dp->dp_dirp = strndup(cp, len);
1503 if (dp->dp_dirp == NULL)
1504 out_of_mem();
1505 *dpp = dp;
1506 return (dp->dp_dirp);
1507 }
1508
1509 /*
1510 * Hang the dir list element off the dirpath binary tree as required
1511 * and update the entry for host.
1512 */
1513 void
1514 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep,
1515 int flags)
1516 {
1517 struct hostlist *hp;
1518 struct dirlist *dp2;
1519
1520 if (flags & OP_ALLDIRS) {
1521 if (ep->ex_defdir)
1522 free((caddr_t)dp);
1523 else
1524 ep->ex_defdir = dp;
1525 if (grp == NULL) {
1526 ep->ex_defdir->dp_flag |= DP_DEFSET;
1527 } else while (grp) {
1528 hp = get_ht();
1529 hp->ht_grp = grp;
1530 hp->ht_next = ep->ex_defdir->dp_hosts;
1531 ep->ex_defdir->dp_hosts = hp;
1532 grp = grp->gr_next;
1533 }
1534 } else {
1535
1536 /*
1537 * Loop through the directories adding them to the tree.
1538 */
1539 while (dp) {
1540 dp2 = dp->dp_left;
1541 add_dlist(&ep->ex_dirl, dp, grp, flags);
1542 dp = dp2;
1543 }
1544 }
1545 }
1546
1547 /*
1548 * Traverse the binary tree either updating a node that is already there
1549 * for the new directory or adding the new node.
1550 */
1551 void
1552 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp,
1553 int flags)
1554 {
1555 struct dirlist *dp;
1556 struct hostlist *hp;
1557 int cmp;
1558
1559 dp = *dpp;
1560 if (dp) {
1561 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp);
1562 if (cmp > 0) {
1563 add_dlist(&dp->dp_left, newdp, grp, flags);
1564 return;
1565 } else if (cmp < 0) {
1566 add_dlist(&dp->dp_right, newdp, grp, flags);
1567 return;
1568 } else
1569 free((caddr_t)newdp);
1570 } else {
1571 dp = newdp;
1572 dp->dp_left = NULL;
1573 *dpp = dp;
1574 }
1575 if (grp) {
1576
1577 /*
1578 * Hang all of the host(s) off of the directory point.
1579 */
1580 do {
1581 hp = get_ht();
1582 hp->ht_grp = grp;
1583 hp->ht_next = dp->dp_hosts;
1584 dp->dp_hosts = hp;
1585 grp = grp->gr_next;
1586 } while (grp);
1587 } else {
1588 dp->dp_flag |= DP_DEFSET;
1589 }
1590 }
1591
1592 /*
1593 * Search for a dirpath on the export point.
1594 */
1595 struct dirlist *
1596 dirp_search(struct dirlist *dp, char *dirp)
1597 {
1598 int cmp;
1599
1600 if (dp) {
1601 cmp = strcmp(dp->dp_dirp, dirp);
1602 if (cmp > 0)
1603 return (dirp_search(dp->dp_left, dirp));
1604 else if (cmp < 0)
1605 return (dirp_search(dp->dp_right, dirp));
1606 else
1607 return (dp);
1608 }
1609 return (dp);
1610 }
1611
1612 /*
1613 * Scan for a host match in a directory tree.
1614 */
1615 int
1616 chk_host(struct dirlist *dp, struct sockaddr *saddr, int *defsetp,
1617 int *hostsetp)
1618 {
1619 struct hostlist *hp;
1620 struct grouplist *grp;
1621 struct addrinfo *ai;
1622
1623 if (dp) {
1624 if (dp->dp_flag & DP_DEFSET)
1625 *defsetp = dp->dp_flag;
1626 hp = dp->dp_hosts;
1627 while (hp) {
1628 grp = hp->ht_grp;
1629 switch (grp->gr_type) {
1630 case GT_HOST:
1631 ai = grp->gr_ptr.gt_addrinfo;
1632 for (; ai; ai = ai->ai_next) {
1633 if (!sacmp(ai->ai_addr, saddr, NULL)) {
1634 *hostsetp =
1635 (hp->ht_flag | DP_HOSTSET);
1636 return (1);
1637 }
1638 }
1639 break;
1640 case GT_NET:
1641 if (!sacmp(saddr, (struct sockaddr *)
1642 &grp->gr_ptr.gt_net.nt_net,
1643 (struct sockaddr *)
1644 &grp->gr_ptr.gt_net.nt_mask)) {
1645 *hostsetp = (hp->ht_flag | DP_HOSTSET);
1646 return (1);
1647 }
1648 break;
1649 }
1650 hp = hp->ht_next;
1651 }
1652 }
1653 return (0);
1654 }
1655
1656 /*
1657 * Scan tree for a host that matches the address.
1658 */
1659 int
1660 scan_tree(struct dirlist *dp, struct sockaddr *saddr)
1661 {
1662 int defset, hostset;
1663
1664 if (dp) {
1665 if (scan_tree(dp->dp_left, saddr))
1666 return (1);
1667 if (chk_host(dp, saddr, &defset, &hostset))
1668 return (1);
1669 if (scan_tree(dp->dp_right, saddr))
1670 return (1);
1671 }
1672 return (0);
1673 }
1674
1675 /*
1676 * Traverse the dirlist tree and free it up.
1677 */
1678 void
1679 free_dir(struct dirlist *dp)
1680 {
1681
1682 if (dp) {
1683 free_dir(dp->dp_left);
1684 free_dir(dp->dp_right);
1685 free_host(dp->dp_hosts);
1686 free(dp->dp_dirp);
1687 free(dp);
1688 }
1689 }
1690
1691 /*
1692 * Parse the option string and update fields.
1693 * Option arguments may either be -<option>=<value> or
1694 * -<option> <value>
1695 */
1696 int
1697 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp,
1698 int *has_hostp, int *exflagsp, struct ucred *cr)
1699 {
1700 char *cpoptarg, *cpoptend;
1701 char *cp, *endcp, *cpopt, savedc, savedc2;
1702 int allflag, usedarg;
1703
1704 savedc2 = '\0';
1705 cpopt = *cpp;
1706 cpopt++;
1707 cp = *endcpp;
1708 savedc = *cp;
1709 *cp = '\0';
1710 while (cpopt && *cpopt) {
1711 allflag = 1;
1712 usedarg = -2;
1713 if ((cpoptend = strchr(cpopt, ','))) {
1714 *cpoptend++ = '\0';
1715 if ((cpoptarg = strchr(cpopt, '=')))
1716 *cpoptarg++ = '\0';
1717 } else {
1718 if ((cpoptarg = strchr(cpopt, '=')))
1719 *cpoptarg++ = '\0';
1720 else {
1721 *cp = savedc;
1722 nextfield(&cp, &endcp);
1723 **endcpp = '\0';
1724 if (endcp > cp && *cp != '-') {
1725 cpoptarg = cp;
1726 savedc2 = *endcp;
1727 *endcp = '\0';
1728 usedarg = 0;
1729 }
1730 }
1731 }
1732 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) {
1733 *exflagsp |= MNT_EXRDONLY;
1734 } else if (cpoptarg && (!strcmp(cpopt, "maproot") ||
1735 !(allflag = strcmp(cpopt, "mapall")) ||
1736 !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) {
1737 usedarg++;
1738 parsecred(cpoptarg, cr);
1739 if (allflag == 0) {
1740 *exflagsp |= MNT_EXPORTANON;
1741 opt_flags |= OP_MAPALL;
1742 } else
1743 opt_flags |= OP_MAPROOT;
1744 } else if (cpoptarg && (!strcmp(cpopt, "mask") ||
1745 !strcmp(cpopt, "m"))) {
1746 if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) {
1747 syslog(LOG_ERR, "bad mask: %s", cpoptarg);
1748 return (1);
1749 }
1750 usedarg++;
1751 opt_flags |= OP_MASK;
1752 } else if (cpoptarg && (!strcmp(cpopt, "network") ||
1753 !strcmp(cpopt, "n"))) {
1754 if (strchr(cpoptarg, '/') != NULL) {
1755 if (debug)
1756 fprintf(stderr, "setting OP_MASKLEN\n");
1757 opt_flags |= OP_MASKLEN;
1758 }
1759 if (grp->gr_type != GT_NULL) {
1760 syslog(LOG_ERR, "network/host conflict");
1761 return (1);
1762 } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) {
1763 syslog(LOG_ERR, "bad net: %s", cpoptarg);
1764 return (1);
1765 }
1766 grp->gr_type = GT_NET;
1767 *has_hostp = 1;
1768 usedarg++;
1769 opt_flags |= OP_NET;
1770 } else if (!strcmp(cpopt, "alldirs")) {
1771 opt_flags |= OP_ALLDIRS;
1772 } else if (!strcmp(cpopt, "public")) {
1773 *exflagsp |= MNT_EXPUBLIC;
1774 } else if (!strcmp(cpopt, "webnfs")) {
1775 *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON);
1776 opt_flags |= OP_MAPALL;
1777 } else if (cpoptarg && !strcmp(cpopt, "index")) {
1778 ep->ex_indexfile = strdup(cpoptarg);
1779 } else if (!strcmp(cpopt, "quiet")) {
1780 opt_flags |= OP_QUIET;
1781 } else {
1782 syslog(LOG_ERR, "bad opt %s", cpopt);
1783 return (1);
1784 }
1785 if (usedarg >= 0) {
1786 *endcp = savedc2;
1787 **endcpp = savedc;
1788 if (usedarg > 0) {
1789 *cpp = cp;
1790 *endcpp = endcp;
1791 }
1792 return (0);
1793 }
1794 cpopt = cpoptend;
1795 }
1796 **endcpp = savedc;
1797 return (0);
1798 }
1799
1800 /*
1801 * Translate a character string to the corresponding list of network
1802 * addresses for a hostname.
1803 */
1804 int
1805 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp)
1806 {
1807 struct grouplist *checkgrp;
1808 struct addrinfo *ai, *tai, hints;
1809 int ecode;
1810 char host[NI_MAXHOST];
1811
1812 if (grp->gr_type != GT_NULL) {
1813 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp);
1814 return (1);
1815 }
1816 memset(&hints, 0, sizeof hints);
1817 hints.ai_flags = AI_CANONNAME;
1818 hints.ai_protocol = IPPROTO_UDP;
1819 ecode = getaddrinfo(cp, NULL, &hints, &ai);
1820 if (ecode != 0) {
1821 syslog(LOG_ERR,"can't get address info for host %s", cp);
1822 return 1;
1823 }
1824 grp->gr_ptr.gt_addrinfo = ai;
1825 while (ai != NULL) {
1826 if (ai->ai_canonname == NULL) {
1827 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host,
1828 sizeof host, NULL, 0, NI_NUMERICHOST) != 0)
1829 strlcpy(host, "?", sizeof(host));
1830 ai->ai_canonname = strdup(host);
1831 ai->ai_flags |= AI_CANONNAME;
1832 }
1833 if (debug)
1834 fprintf(stderr, "got host %s\n", ai->ai_canonname);
1835 /*
1836 * Sanity check: make sure we don't already have an entry
1837 * for this host in the grouplist.
1838 */
1839 for (checkgrp = tgrp; checkgrp != NULL;
1840 checkgrp = checkgrp->gr_next) {
1841 if (checkgrp->gr_type != GT_HOST)
1842 continue;
1843 for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL;
1844 tai = tai->ai_next) {
1845 if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0)
1846 continue;
1847 if (debug)
1848 fprintf(stderr,
1849 "ignoring duplicate host %s\n",
1850 ai->ai_canonname);
1851 grp->gr_type = GT_IGNORE;
1852 return (0);
1853 }
1854 }
1855 ai = ai->ai_next;
1856 }
1857 grp->gr_type = GT_HOST;
1858 return (0);
1859 }
1860
1861 /*
1862 * Free up an exports list component
1863 */
1864 void
1865 free_exp(struct exportlist *ep)
1866 {
1867
1868 if (ep->ex_defdir) {
1869 free_host(ep->ex_defdir->dp_hosts);
1870 free((caddr_t)ep->ex_defdir);
1871 }
1872 if (ep->ex_fsdir)
1873 free(ep->ex_fsdir);
1874 if (ep->ex_indexfile)
1875 free(ep->ex_indexfile);
1876 free_dir(ep->ex_dirl);
1877 free((caddr_t)ep);
1878 }
1879
1880 /*
1881 * Free hosts.
1882 */
1883 void
1884 free_host(struct hostlist *hp)
1885 {
1886 struct hostlist *hp2;
1887
1888 while (hp) {
1889 hp2 = hp;
1890 hp = hp->ht_next;
1891 free((caddr_t)hp2);
1892 }
1893 }
1894
1895 struct hostlist *
1896 get_ht(void)
1897 {
1898 struct hostlist *hp;
1899
1900 hp = (struct hostlist *)malloc(sizeof (struct hostlist));
1901 if (hp == NULL)
1902 out_of_mem();
1903 hp->ht_next = NULL;
1904 hp->ht_flag = 0;
1905 return (hp);
1906 }
1907
1908 /*
1909 * Out of memory, fatal
1910 */
1911 void
1912 out_of_mem(void)
1913 {
1914
1915 syslog(LOG_ERR, "out of memory");
1916 exit(2);
1917 }
1918
1919 /*
1920 * Do the mount syscall with the update flag to push the export info into
1921 * the kernel.
1922 */
1923 int
1924 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags,
1925 struct ucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb)
1926 {
1927 struct statfs fsb1;
1928 struct addrinfo *ai;
1929 struct export_args *eap;
1930 char *cp = NULL;
1931 int done;
1932 char savedc = '\0';
1933 union {
1934 struct ufs_args ua;
1935 struct iso_args ia;
1936 struct mfs_args ma;
1937 struct msdosfs_args da;
1938 struct ntfs_args na;
1939 } args;
1940
1941 bzero(&args, sizeof args);
1942 /* XXX, we assume that all xx_args look like ufs_args. */
1943 args.ua.fspec = 0;
1944 eap = &args.ua.export;
1945
1946 eap->ex_flags = exflags;
1947 eap->ex_anon = *anoncrp;
1948 eap->ex_indexfile = ep->ex_indexfile;
1949 if (grp->gr_type == GT_HOST)
1950 ai = grp->gr_ptr.gt_addrinfo;
1951 else
1952 ai = NULL;
1953 done = FALSE;
1954 while (!done) {
1955 switch (grp->gr_type) {
1956 case GT_HOST:
1957 if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0)
1958 goto skip;
1959 eap->ex_addr = ai->ai_addr;
1960 eap->ex_addrlen = ai->ai_addrlen;
1961 eap->ex_masklen = 0;
1962 break;
1963 case GT_NET:
1964 if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 &&
1965 have_v6 == 0)
1966 goto skip;
1967 eap->ex_addr =
1968 (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net;
1969 eap->ex_addrlen = args.ua.export.ex_addr->sa_len;
1970 eap->ex_mask =
1971 (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask;
1972 eap->ex_masklen = args.ua.export.ex_mask->sa_len;
1973 break;
1974 case GT_DEFAULT:
1975 eap->ex_addr = NULL;
1976 eap->ex_addrlen = 0;
1977 eap->ex_mask = NULL;
1978 eap->ex_masklen = 0;
1979 break;
1980 case GT_IGNORE:
1981 return(0);
1982 break;
1983 default:
1984 syslog(LOG_ERR, "bad grouptype");
1985 if (cp)
1986 *cp = savedc;
1987 return (1);
1988 }
1989
1990 /*
1991 * XXX:
1992 * Maybe I should just use the fsb->f_mntonname path instead
1993 * of looping back up the dirp to the mount point??
1994 * Also, needs to know how to export all types of local
1995 * exportable filesystems and not just "ufs".
1996 */
1997 for (;;) {
1998 int r;
1999
2000 r = mountctl(fsb->f_mntonname, MOUNTCTL_SET_EXPORT,
2001 -1,
2002 &args.ua.export, sizeof(args.ua.export),
2003 NULL, 0);
2004 if (r < 0 && errno == EOPNOTSUPP) {
2005 r = mount(fsb->f_fstypename, dirp,
2006 fsb->f_flags | MNT_UPDATE,
2007 (caddr_t)&args);
2008 }
2009 if (r >= 0)
2010 break;
2011 if (cp)
2012 *cp-- = savedc;
2013 else
2014 cp = dirp + dirplen - 1;
2015 if (opt_flags & OP_QUIET)
2016 return (1);
2017 if (errno == EPERM) {
2018 if (debug)
2019 warnx("can't change attributes for %s",
2020 dirp);
2021 syslog(LOG_ERR,
2022 "can't change attributes for %s", dirp);
2023 return (1);
2024 }
2025 if (opt_flags & OP_ALLDIRS) {
2026 if (errno == EINVAL)
2027 syslog(LOG_ERR,
2028 "-alldirs requested but %s is not a filesystem mountpoint",
2029 dirp);
2030 else
2031 syslog(LOG_ERR,
2032 "could not remount %s: %m",
2033 dirp);
2034 return (1);
2035 }
2036 /* back up over the last component */
2037 while (*cp == '/' && cp > dirp)
2038 cp--;
2039 while (*(cp - 1) != '/' && cp > dirp)
2040 cp--;
2041 if (cp == dirp) {
2042 if (debug)
2043 warnx("mnt unsucc");
2044 syslog(LOG_ERR, "can't export %s", dirp);
2045 return (1);
2046 }
2047 savedc = *cp;
2048 *cp = '\0';
2049 /* Check that we're still on the same filesystem. */
2050 if (statfs(dirp, &fsb1) != 0 || bcmp(&fsb1.f_fsid,
2051 &fsb->f_fsid, sizeof(fsb1.f_fsid)) != 0) {
2052 *cp = savedc;
2053 syslog(LOG_ERR, "can't export %s", dirp);
2054 return (1);
2055 }
2056 }
2057 skip:
2058 if (ai != NULL)
2059 ai = ai->ai_next;
2060 if (ai == NULL)
2061 done = TRUE;
2062 }
2063 if (cp)
2064 *cp = savedc;
2065 return (0);
2066 }
2067
2068 /*
2069 * Translate a net address.
2070 *
2071 * If `maskflg' is nonzero, then `cp' is a netmask, not a network address.
2072 */
2073 int
2074 get_net(char *cp, struct netmsk *net, int maskflg)
2075 {
2076 struct netent *np = NULL;
2077 char *name, *p, *prefp;
2078 struct sockaddr_in sin;
2079 struct sockaddr *sa = NULL;
2080 struct addrinfo hints, *ai = NULL;
2081 char netname[NI_MAXHOST];
2082 long preflen;
2083
2084 p = prefp = NULL;
2085 if ((opt_flags & OP_MASKLEN) && !maskflg) {
2086 p = strchr(cp, '/');
2087 *p = '\0';
2088 prefp = p + 1;
2089 }
2090
2091 /*
2092 * Check for a numeric address first. We wish to avoid
2093 * possible DNS lookups in getnetbyname().
2094 */
2095 if (isxdigit(*cp) || *cp == ':') {
2096 memset(&hints, 0, sizeof hints);
2097 /* Ensure the mask and the network have the same family. */
2098 if (maskflg && (opt_flags & OP_NET))
2099 hints.ai_family = net->nt_net.ss_family;
2100 else if (!maskflg && (opt_flags & OP_HAVEMASK))
2101 hints.ai_family = net->nt_mask.ss_family;
2102 else
2103 hints.ai_family = AF_UNSPEC;
2104 hints.ai_flags = AI_NUMERICHOST;
2105 if (getaddrinfo(cp, NULL, &hints, &ai) == 0)
2106 sa = ai->ai_addr;
2107 if (sa != NULL && ai->ai_family == AF_INET) {
2108 /*
2109 * The address in `cp' is really a network address, so
2110 * use inet_network() to re-interpret this correctly.
2111 * e.g. "127.1" means 127.1.0.0, not 127.0.0.1.
2112 */
2113 bzero(&sin, sizeof sin);
2114 sin.sin_family = AF_INET;
2115 sin.sin_len = sizeof sin;
2116 sin.sin_addr = inet_makeaddr(inet_network(cp), 0);
2117 if (debug)
2118 fprintf(stderr, "get_net: v4 addr %s\n",
2119 inet_ntoa(sin.sin_addr));
2120 sa = (struct sockaddr *)&sin;
2121 }
2122 }
2123 if (sa == NULL && (np = getnetbyname(cp)) != NULL) {
2124 bzero(&sin, sizeof sin);
2125 sin.sin_family = AF_INET;
2126 sin.sin_len = sizeof sin;
2127 sin.sin_addr = inet_makeaddr(np->n_net, 0);
2128 sa = (struct sockaddr *)&sin;
2129 }
2130 if (sa == NULL)
2131 goto fail;
2132
2133 if (maskflg) {
2134 /* The specified sockaddr is a mask. */
2135 if (checkmask(sa) != 0)
2136 goto fail;
2137 bcopy(sa, &net->nt_mask, sa->sa_len);
2138 opt_flags |= OP_HAVEMASK;
2139 } else {
2140 /* The specified sockaddr is a network address. */
2141 bcopy(sa, &net->nt_net, sa->sa_len);
2142
2143 /* Get a network name for the export list. */
2144 if (np) {
2145 name = np->n_name;
2146 } else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname,
2147 NULL, 0, NI_NUMERICHOST) == 0) {
2148 name = netname;
2149 } else {
2150 goto fail;
2151 }
2152 if ((net->nt_name = strdup(name)) == NULL)
2153 out_of_mem();
2154
2155 /*
2156 * Extract a mask from either a "/<masklen>" suffix, or
2157 * from the class of an IPv4 address.
2158 */
2159 if (opt_flags & OP_MASKLEN) {
2160 preflen = strtol(prefp, NULL, 10);
2161 if (preflen < 0L || preflen == LONG_MAX)
2162 goto fail;
2163 bcopy(sa, &net->nt_mask, sa->sa_len);
2164 if (makemask(&net->nt_mask, (int)preflen) != 0)
2165 goto fail;
2166 opt_flags |= OP_HAVEMASK;
2167 *p = '/';
2168 } else if (sa->sa_family == AF_INET &&
2169 (opt_flags & OP_MASK) == 0) {
2170 in_addr_t addr;
2171
2172 addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
2173 if (IN_CLASSA(addr))
2174 preflen = 8;
2175 else if (IN_CLASSB(addr))
2176 preflen = 16;
2177 else if (IN_CLASSC(addr))
2178 preflen = 24;
2179 else if (IN_CLASSD(addr))
2180 preflen = 28;
2181 else
2182 preflen = 32; /* XXX */
2183
2184 bcopy(sa, &net->nt_mask, sa->sa_len);
2185 makemask(&net->nt_mask, (int)preflen);
2186 opt_flags |= OP_HAVEMASK;
2187 }
2188 }
2189
2190 if (ai)
2191 freeaddrinfo(ai);
2192 return 0;
2193
2194 fail:
2195 if (ai)
2196 freeaddrinfo(ai);
2197 return 1;
2198 }
2199
2200 /*
2201 * Parse out the next white space separated field
2202 */
2203 void
2204 nextfield(char **cp, char **endcp)
2205 {
2206 char *p;
2207
2208 p = *cp;
2209 while (*p == ' ' || *p == '\t')
2210 p++;
2211 if (*p == '\n' || *p == '\0')
2212 *cp = *endcp = p;
2213 else {
2214 *cp = p++;
2215 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
2216 p++;
2217 *endcp = p;
2218 }
2219 }
2220
2221 /*
2222 * Get an exports file line. Skip over blank lines and handle line
2223 * continuations.
2224 */
2225 int
2226 get_line(void)
2227 {
2228 char *p, *cp;
2229 size_t len;
2230 int totlen, cont_line;
2231
2232 /*
2233 * Loop around ignoring blank lines and getting all continuation lines.
2234 */
2235 p = line;
2236 totlen = 0;
2237 do {
2238 if ((p = fgetln(exp_file, &len)) == NULL)
2239 return (0);
2240 cp = p + len - 1;
2241 cont_line = 0;
2242 while (cp >= p &&
2243 (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) {
2244 if (*cp == '\\')
2245 cont_line = 1;
2246 cp--;
2247 len--;
2248 }
2249 if (cont_line) {
2250 *++cp = ' ';
2251 len++;
2252 }
2253 if (linesize < len + totlen + 1) {
2254 linesize = len + totlen + 1;
2255 line = realloc(line, linesize);
2256 if (line == NULL)
2257 out_of_mem();
2258 }
2259 memcpy(line + totlen, p, len);
2260 totlen += len;
2261 line[totlen] = '\0';
2262 } while (totlen == 0 || cont_line);
2263 return (1);
2264 }
2265
2266 /*
2267 * Parse a description of a credential.
2268 */
2269 void
2270 parsecred(char *namelist, struct ucred *cr)
2271 {
2272 char *name;
2273 int cnt;
2274 char *names;
2275 struct passwd *pw;
2276 struct group *gr;
2277 gid_t groups[NGROUPS + 1];
2278 int ngroups;
2279
2280 /*
2281 * Set up the unprivileged user.
2282 */
2283 cr->cr_ref = 1;
2284 cr->cr_uid = 65534;
2285 cr->cr_groups[0] = 65533;
2286 cr->cr_ngroups = 1;
2287 /*
2288 * Get the user's password table entry.
2289 */
2290 names = strsep(&namelist, " \t\n");
2291 name = strsep(&names, ":");
2292 if (isdigit(*name) || *name == '-')
2293 pw = getpwuid(atoi(name));
2294 else
2295 pw = getpwnam(name);
2296 /*
2297 * Credentials specified as those of a user.
2298 */
2299 if (names == NULL) {
2300 if (pw == NULL) {
2301 syslog(LOG_ERR, "unknown user: %s", name);
2302 return;
2303 }
2304 cr->cr_uid = pw->pw_uid;
2305 ngroups = NGROUPS + 1;
2306 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups))
2307 syslog(LOG_ERR, "too many groups");
2308 /*
2309 * Compress out duplicate
2310 */
2311 cr->cr_ngroups = ngroups - 1;
2312 cr->cr_groups[0] = groups[0];
2313 for (cnt = 2; cnt < ngroups; cnt++)
2314 cr->cr_groups[cnt - 1] = groups[cnt];
2315 return;
2316 }
2317 /*
2318 * Explicit credential specified as a colon separated list:
2319 * uid:gid:gid:...
2320 */
2321 if (pw != NULL)
2322 cr->cr_uid = pw->pw_uid;
2323 else if (isdigit(*name) || *name == '-')
2324 cr->cr_uid = atoi(name);
2325 else {
2326 syslog(LOG_ERR, "unknown user: %s", name);
2327 return;
2328 }
2329 cr->cr_ngroups = 0;
2330 while (names != NULL && *names != '\0' && cr->cr_ngroups < NGROUPS) {
2331 name = strsep(&names, ":");
2332 if (isdigit(*name) || *name == '-') {
2333 cr->cr_groups[cr->cr_ngroups++] = atoi(name);
2334 } else {
2335 if ((gr = getgrnam(name)) == NULL) {
2336 syslog(LOG_ERR, "unknown group: %s", name);
2337 continue;
2338 }
2339 cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid;
2340 }
2341 }
2342 if (names != NULL && *names != '\0' && cr->cr_ngroups == NGROUPS)
2343 syslog(LOG_ERR, "too many groups");
2344 }
2345
2346 #define STRSIZ (RPCMNT_NAMELEN+RPCMNT_PATHLEN+50)
2347 /*
2348 * Routines that maintain the remote mounttab
2349 */
2350 void
2351 get_mountlist(void)
2352 {
2353 struct mountlist *mlp, **mlpp;
2354 char *host, *dirp, *cp;
2355 char str[STRSIZ];
2356 FILE *mlfile;
2357
2358 if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) {
2359 if (errno == ENOENT)
2360 return;
2361 else {
2362 syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST);
2363 return;
2364 }
2365 }
2366 mlpp = &mlhead;
2367 while (fgets(str, STRSIZ, mlfile) != NULL) {
2368 cp = str;
2369 host = strsep(&cp, " \t\n");
2370 dirp = strsep(&cp, " \t\n");
2371 if (host == NULL || dirp == NULL)
2372 continue;
2373 mlp = (struct mountlist *)malloc(sizeof (*mlp));
2374 if (mlp == NULL)
2375 out_of_mem();
2376 strncpy(mlp->ml_host, host, RPCMNT_NAMELEN);
2377 mlp->ml_host[RPCMNT_NAMELEN] = '\0';
2378 strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN);
2379 mlp->ml_dirp[RPCMNT_PATHLEN] = '\0';
2380 mlp->ml_next = NULL;
2381 *mlpp = mlp;
2382 mlpp = &mlp->ml_next;
2383 }
2384 fclose(mlfile);
2385 }
2386
2387 static
2388 void
2389 delete_export(struct statfs *fsp)
2390 {
2391 union {
2392 struct ufs_args ua;
2393 struct iso_args ia;
2394 struct mfs_args ma;
2395 struct msdosfs_args da;
2396 struct ntfs_args na;
2397 } targs;
2398 struct export_args export;
2399
2400 export.ex_flags = MNT_DELEXPORT;
2401 if (mountctl(fsp->f_mntonname, MOUNTCTL_SET_EXPORT, -1,
2402 &export, sizeof(export), NULL, 0) == 0) {
2403 /* ok */
2404 } else if (!strcmp(fsp->f_fstypename, "mfs") ||
2405 !strcmp(fsp->f_fstypename, "ufs") ||
2406 !strcmp(fsp->f_fstypename, "msdos") ||
2407 !strcmp(fsp->f_fstypename, "ntfs") ||
2408 !strcmp(fsp->f_fstypename, "cd9660")) {
2409 bzero(&targs, sizeof targs);
2410 targs.ua.fspec = NULL;
2411 targs.ua.export.ex_flags = MNT_DELEXPORT;
2412 if (mount(fsp->f_fstypename, fsp->f_mntonname,
2413 fsp->f_flags | MNT_UPDATE,
2414 (caddr_t)&targs) < 0)
2415 syslog(LOG_ERR, "can't delete exports for %s",
2416 fsp->f_mntonname);
2417 }
2418 }
2419
2420
2421 void
2422 del_mlist(char *hostp, char *dirp)
2423 {
2424 struct mountlist *mlp, **mlpp;
2425 struct mountlist *mlp2;
2426 FILE *mlfile;
2427 int fnd = 0;
2428
2429 mlpp = &mlhead;
2430 mlp = mlhead;
2431 while (mlp) {
2432 if (!strcmp(mlp->ml_host, hostp) &&
2433 (!dirp || !strcmp(mlp->ml_dirp, dirp))) {
2434 fnd = 1;
2435 mlp2 = mlp;
2436 *mlpp = mlp = mlp->ml_next;
2437 free((caddr_t)mlp2);
2438 } else {
2439 mlpp = &mlp->ml_next;
2440 mlp = mlp->ml_next;
2441 }
2442 }
2443 if (fnd) {
2444 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) {
2445 syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST);
2446 return;
2447 }
2448 mlp = mlhead;
2449 while (mlp) {
2450 fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
2451 mlp = mlp->ml_next;
2452 }
2453 fclose(mlfile);
2454 }
2455 }
2456
2457 void
2458 add_mlist(char *hostp, char *dirp)
2459 {
2460 struct mountlist *mlp, **mlpp;
2461 FILE *mlfile;
2462
2463 mlpp = &mlhead;
2464 mlp = mlhead;
2465 while (mlp) {
2466 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp))
2467 return;
2468 mlpp = &mlp->ml_next;
2469 mlp = mlp->ml_next;
2470 }
2471 mlp = (struct mountlist *)malloc(sizeof (*mlp));
2472 if (mlp == NULL)
2473 out_of_mem();
2474 strncpy(mlp->ml_host, hostp, RPCMNT_NAMELEN);
2475 mlp->ml_host[RPCMNT_NAMELEN] = '\0';
2476 strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN);
2477 mlp->ml_dirp[RPCMNT_PATHLEN] = '\0';
2478 mlp->ml_next = NULL;
2479 *mlpp = mlp;
2480 if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
2481 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST);
2482 return;
2483 }
2484 fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
2485 fclose(mlfile);
2486 }
2487
2488 /*
2489 * Free up a group list.
2490 */
2491 void
2492 free_grp(struct grouplist *grp)
2493 {
2494 if (grp->gr_type == GT_HOST) {
2495 if (grp->gr_ptr.gt_addrinfo != NULL)
2496 freeaddrinfo(grp->gr_ptr.gt_addrinfo);
2497 } else if (grp->gr_type == GT_NET) {
2498 if (grp->gr_ptr.gt_net.nt_name)
2499 free(grp->gr_ptr.gt_net.nt_name);
2500 }
2501 free((caddr_t)grp);
2502 }
2503
2504 #ifdef DEBUG
2505 void
2506 SYSLOG(int pri, const char *fmt, ...)
2507 {
2508 va_list ap;
2509
2510 va_start(ap, fmt);
2511 vfprintf(stderr, fmt, ap);
2512 va_end(ap);
2513 }
2514 #endif /* DEBUG */
2515
2516 /*
2517 * Check options for consistency.
2518 */
2519 int
2520 check_options(struct dirlist *dp)
2521 {
2522
2523 if (dp == NULL)
2524 return (1);
2525 if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL)) {
2526 syslog(LOG_ERR, "-mapall and -maproot mutually exclusive");
2527 return (1);
2528 }
2529 if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) {
2530 syslog(LOG_ERR, "-mask requires -network");
2531 return (1);
2532 }
2533 if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) {
2534 syslog(LOG_ERR, "-network requires mask specification");
2535 return (1);
2536 }
2537 if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) {
2538 syslog(LOG_ERR, "-mask and /masklen are mutually exclusive");
2539 return (1);
2540 }
2541 if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
2542 syslog(LOG_ERR, "-alldirs has multiple directories");
2543 return (1);
2544 }
2545 return (0);
2546 }
2547
2548 /*
2549 * Check an absolute directory path for any symbolic links. Return true
2550 */
2551 int
2552 check_dirpath(char *dirp)
2553 {
2554 char *cp;
2555 int ret = 1;
2556 struct stat sb;
2557
2558 cp = dirp + 1;
2559 while (*cp && ret) {
2560 if (*cp == '/') {
2561 *cp = '\0';
2562 if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
2563 ret = 0;
2564 *cp = '/';
2565 }
2566 cp++;
2567 }
2568 if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
2569 ret = 0;
2570 return (ret);
2571 }
2572
2573 /*
2574 * Make a netmask according to the specified prefix length. The ss_family
2575 * and other non-address fields must be initialised before calling this.
2576 */
2577 int
2578 makemask(struct sockaddr_storage *ssp, int bitlen)
2579 {
2580 u_char *p;
2581 int bits, i, len;
2582
2583 if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL)
2584 return (-1);
2585 if (bitlen > len * CHAR_BIT)
2586 return (-1);
2587 for (i = 0; i < len; i++) {
2588 bits = (bitlen > CHAR_BIT) ? CHAR_BIT : bitlen;
2589 *p++ = (u_char)~0 << (CHAR_BIT - bits);
2590 bitlen -= bits;
2591 }
2592 return 0;
2593 }
2594
2595 /*
2596 * Check that the sockaddr is a valid netmask. Returns 0 if the mask
2597 * is acceptable (i.e. of the form 1...10....0).
2598 */
2599 int
2600 checkmask(struct sockaddr *sa)
2601 {
2602 u_char *mask;
2603 int i, len;
2604
2605 if ((mask = sa_rawaddr(sa, &len)) == NULL)
2606 return (-1);
2607
2608 for (i = 0; i < len; i++)
2609 if (mask[i] != 0xff)
2610 break;
2611 if (i < len) {
2612 if (~mask[i] & (u_char)(~mask[i] + 1))
2613 return (-1);
2614 i++;
2615 }
2616 for (; i < len; i++)
2617 if (mask[i] != 0)
2618 return (-1);
2619 return (0);
2620 }
2621
2622 /*
2623 * Compare two sockaddrs according to a specified mask. Return zero if
2624 * `sa1' matches `sa2' when filtered by the netmask in `samask'.
2625 * If samask is NULL, perform a full comparision.
2626 */
2627 int
2628 sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask)
2629 {
2630 unsigned char *p1, *p2, *mask;
2631 int len, i;
2632
2633 if (sa1->sa_family != sa2->sa_family ||
2634 (p1 = sa_rawaddr(sa1, &len)) == NULL ||
2635 (p2 = sa_rawaddr(sa2, NULL)) == NULL)
2636 return (1);
2637
2638 switch (sa1->sa_family) {
2639 case AF_INET6:
2640 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
2641 ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
2642 return (1);
2643 break;
2644 }
2645
2646 /* Simple binary comparison if no mask specified. */
2647 if (samask == NULL)
2648 return (memcmp(p1, p2, len));
2649
2650 /* Set up the mask, and do a mask-based comparison. */
2651 if (sa1->sa_family != samask->sa_family ||
2652 (mask = sa_rawaddr(samask, NULL)) == NULL)
2653 return (1);
2654
2655 for (i = 0; i < len; i++)
2656 if ((p1[i] & mask[i]) != (p2[i] & mask[i]))
2657 return (1);
2658 return (0);
2659 }
2660
2661 /*
2662 * Return a pointer to the part of the sockaddr that contains the
2663 * raw address, and set *nbytes to its length in bytes. Returns
2664 * NULL if the address family is unknown.
2665 */
2666 void *
2667 sa_rawaddr(struct sockaddr *sa, int *nbytes) {
2668 void *p;
2669 int len;
2670
2671 switch (sa->sa_family) {
2672 case AF_INET:
2673 len = sizeof(((struct sockaddr_in *)sa)->sin_addr);
2674 p = &((struct sockaddr_in *)sa)->sin_addr;
2675 break;
2676 case AF_INET6:
2677 len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr);
2678 p = &((struct sockaddr_in6 *)sa)->sin6_addr;
2679 break;
2680 default:
2681 p = NULL;
2682 len = 0;
2683 }
2684
2685 if (nbytes != NULL)
2686 *nbytes = len;
2687 return (p);
2688 }
2689
2690 void
2691 huphandler1(int sig __unused)
2692 {
2693 got_sighup1 = 1;
2694 }
2695
2696 void
2697 huphandler2(int sig __unused)
2698 {
2699 got_sighup2 = 1;
2700 }
2701
2702 void terminate(int sig __unused)
2703 {
2704 pidfile_remove(pfh);
2705 rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL);
2706 rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL);
2707 exit (0);
2708 }
DragonFly BSD