9b6293d916246dd0e6bd85c343a83292515c0384
[dragonfly.git] / sbin / mountd / mountd.c
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 }