a252f9a9d94cb3ebaa07edb11b23af3092789987
[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. All advertising materials mentioning features or use of this software
17  *    must display the following acknowledgement:
18  *      This product includes software developed by the University of
19  *      California, Berkeley and its contributors.
20  * 4. Neither the name of the University nor the names of its contributors
21  *    may be used to endorse or promote products derived from this software
22  *    without specific prior written permission.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34  * SUCH DAMAGE.
35  *
36  * @(#) Copyright (c) 1989, 1993 The Regents of the University of California.  All rights reserved.
37  * @(#)mountd.c 8.15 (Berkeley) 5/1/95
38  * $FreeBSD: src/sbin/mountd/mountd.c,v 1.39.2.5 2002/09/13 15:57:43 joerg Exp $
39  */
40
41 #include <sys/param.h>
42 #include <sys/mount.h>
43 #include <sys/mountctl.h>
44 #include <sys/fcntl.h>
45 #include <sys/stat.h>
46 #include <sys/syslog.h>
47 #include <sys/sysctl.h>
48
49 #include <rpc/rpc.h>
50 #include <rpc/pmap_clnt.h>
51 #include <rpc/pmap_prot.h>
52 #include <rpcsvc/mount.h>
53 #include <vfs/nfs/rpcv2.h>
54 #include <vfs/nfs/nfsproto.h>
55 #include <vfs/nfs/nfs.h>
56 #include <vfs/ufs/ufsmount.h>
57 #include <vfs/msdosfs/msdosfsmount.h>
58 #include <vfs/ntfs/ntfsmount.h>
59 #include <vfs/isofs/cd9660/cd9660_mount.h>      /* XXX need isofs in include */
60
61 #include <arpa/inet.h>
62
63 #include <ctype.h>
64 #include <err.h>
65 #include <errno.h>
66 #include <grp.h>
67 #include <netdb.h>
68 #include <pwd.h>
69 #include <signal.h>
70 #include <stdio.h>
71 #include <stdlib.h>
72 #include <string.h>
73 #include <unistd.h>
74 #include "pathnames.h"
75
76 #ifdef DEBUG
77 #include <stdarg.h>
78 #endif
79
80 #ifndef MOUNTDLOCK
81 #define MOUNTDLOCK "/var/run/mountd.lock"
82 #endif
83
84 /*
85  * Structures for keeping the mount list and export list
86  */
87 struct mountlist {
88         struct mountlist *ml_next;
89         char    ml_host[RPCMNT_NAMELEN+1];
90         char    ml_dirp[RPCMNT_PATHLEN+1];
91 };
92
93 struct dirlist {
94         struct dirlist  *dp_left;
95         struct dirlist  *dp_right;
96         int             dp_flag;
97         struct hostlist *dp_hosts;      /* List of hosts this dir exported to */
98         char            dp_dirp[1];     /* Actually malloc'd to size of dir */
99 };
100 /* dp_flag bits */
101 #define DP_DEFSET       0x1
102 #define DP_HOSTSET      0x2
103 #define DP_KERB         0x4
104
105 struct exportlist {
106         struct exportlist *ex_next;
107         struct dirlist  *ex_dirl;
108         struct dirlist  *ex_defdir;
109         int             ex_flag;
110         fsid_t          ex_fs;
111         char            *ex_fsdir;
112         char            *ex_indexfile;
113 };
114 /* ex_flag bits */
115 #define EX_LINKED       0x1
116
117 struct netmsk {
118         struct sockaddr_storage nt_net;
119         u_int32_t       nt_mask;
120         char            *nt_name;
121 };
122
123 union grouptypes {
124         struct addrinfo *gt_addrinfo;
125         struct netmsk   gt_net;
126 };
127
128 struct grouplist {
129         int gr_type;
130         union grouptypes gr_ptr;
131         struct grouplist *gr_next;
132 };
133 /* Group types */
134 #define GT_NULL         0x0
135 #define GT_HOST         0x1
136 #define GT_NET          0x2
137 #define GT_DEFAULT      0x3
138 #define GT_IGNORE       0x5
139
140 struct hostlist {
141         int              ht_flag;       /* Uses DP_xx bits */
142         struct grouplist *ht_grp;
143         struct hostlist  *ht_next;
144 };
145
146 struct fhreturn {
147         int     fhr_flag;
148         int     fhr_vers;
149         nfsfh_t fhr_fh;
150 };
151
152 /* Global defs */
153 char    *add_expdir(struct dirlist **, char *, int);
154 void    add_dlist(struct dirlist **, struct dirlist *,
155                                 struct grouplist *, int);
156 void    add_mlist(char *, char *);
157 int     check_dirpath(char *);
158 int     check_options(struct dirlist *);
159 int     chk_host(struct dirlist *, struct sockaddr *, int *, int *);
160 void    del_mlist(char *, char *);
161 struct dirlist *dirp_search(struct dirlist *, char *);
162 int     do_mount(struct exportlist *, struct grouplist *, int,
163                 struct ucred *, char *, int, struct statfs *);
164 int     do_opt(char **, char **, struct exportlist *, struct grouplist *,
165                                 int *, int *, struct ucred *);
166 struct  exportlist *ex_search(fsid_t *);
167 struct  exportlist *get_exp(void);
168 void    free_dir(struct dirlist *);
169 void    free_exp(struct exportlist *);
170 void    free_grp(struct grouplist *);
171 void    free_host(struct hostlist *);
172 void    get_exportlist(void);
173 int     get_host(char *, struct grouplist *, struct grouplist *);
174 struct hostlist *get_ht(void);
175 int     get_line(void);
176 void    get_mountlist(void);
177 int     get_net(char *, struct netmsk *, int);
178 void    getexp_err(struct exportlist *, struct grouplist *);
179 struct grouplist *get_grp(void);
180 void    hang_dirp(struct dirlist *, struct grouplist *,
181                                 struct exportlist *, int);
182 void    huphandler(int sig);
183 void    mntsrv(struct svc_req *, SVCXPRT *);
184 void    nextfield(char **, char **);
185 void    out_of_mem(void);
186 void    parsecred(char *, struct ucred *);
187 int     put_exlist(struct dirlist *, XDR *, struct dirlist *, int *);
188 int     scan_tree(struct dirlist *, struct sockaddr *);
189 static void usage(void);
190 int     xdr_dir(XDR *, char *);
191 int     xdr_explist(XDR *, caddr_t);
192 int     xdr_fhs(XDR *, caddr_t);
193 int     xdr_mlist(XDR *, caddr_t);
194 void    terminate(int);
195
196 static int      allones(struct sockaddr_storage *, int);
197 static int      bitcmp(void *, void *, int);
198 static int      countones(struct sockaddr *);
199 static int      netpartcmp(struct sockaddr *, struct sockaddr *, int);
200 static int      sacmp(struct sockaddr *, struct sockaddr *);
201
202 struct exportlist *exphead;
203 struct mountlist *mlhead;
204 struct grouplist *grphead;
205 char exname[MAXPATHLEN];
206 struct ucred def_anon = {
207         1,
208         (uid_t) -2,
209         1,
210         { (gid_t) -2 }
211 };
212 int force_v2 = 0;
213 int resvport_only = 1;
214 int dir_only = 1;
215 int do_log = 0;
216 int got_sighup = 0;
217
218 int opt_flags;
219 static int have_v6 = 1;
220 #ifdef NI_WITHSCOPEID
221 static const int ninumeric = NI_NUMERICHOST | NI_WITHSCOPEID;
222 #else
223 static const int ninumeric = NI_NUMERICHOST;
224 #endif
225
226 int mountdlockfd;
227 /* Bits for above */
228 #define OP_MAPROOT      0x01
229 #define OP_MAPALL       0x02
230 #define OP_KERB         0x04
231 #define OP_MASK         0x08
232 #define OP_NET          0x10
233 #define OP_ALLDIRS      0x40
234 /* 0x80 is OP_HAVEMASK in FreeBSD 5+ */
235 #define OP_QUIET        0x100
236 #define OP_MASKLEN      0x200
237
238 #ifdef DEBUG
239 int debug = 1;
240 void    SYSLOG(int, const char *, ...);
241 #define syslog SYSLOG
242 #else
243 int debug = 0;
244 #endif
245
246 /*
247  * Mountd server for NFS mount protocol as described in:
248  * NFS: Network File System Protocol Specification, RFC1094, Appendix A
249  * The optional arguments are the exports file name
250  * default: _PATH_EXPORTS
251  * and "-n" to allow nonroot mount.
252  */
253 int
254 main(int argc, char **argv)
255 {
256         fd_set readfds;
257         SVCXPRT *udptransp, *tcptransp, *udp6transp, *tcp6transp;
258         struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf;
259         int udpsock, tcpsock, udp6sock, tcp6sock;
260         int xcreated = 0, s;
261         int one = 1;
262         int c, error, mib[3];
263         struct vfsconf vfc;
264
265         udp6conf = tcp6conf = NULL;
266         udp6sock = tcp6sock = 0;
267
268         /* Check that another mountd isn't already running. */
269         if ((mountdlockfd = (open(MOUNTDLOCK, O_RDONLY|O_CREAT, 0444))) == -1)
270                 err(1, "%s", MOUNTDLOCK);
271
272         if(flock(mountdlockfd, LOCK_EX|LOCK_NB) == -1 && errno == EWOULDBLOCK)
273                 errx(1, "another rpc.mountd is already running. Aborting");
274         s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
275         if (s < 0)
276                 have_v6 = 0;
277         else
278                 close(s);
279         error = getvfsbyname("nfs", &vfc);
280         if (error && vfsisloadable("nfs")) {
281                 if(vfsload("nfs"))
282                         err(1, "vfsload(nfs)");
283                 endvfsent();    /* flush cache */
284                 error = getvfsbyname("nfs", &vfc);
285         }
286         if (error)
287                 errx(1, "NFS support is not available in the running kernel");
288
289         while ((c = getopt(argc, argv, "2dlnr")) != -1)
290                 switch (c) {
291                 case '2':
292                         force_v2 = 1;
293                         break;
294                 case 'n':
295                         resvport_only = 0;
296                         break;
297                 case 'r':
298                         dir_only = 0;
299                         break;
300                 case 'd':
301                         debug = debug ? 0 : 1;
302                         break;
303                 case 'l':
304                         do_log = 1;
305                         break;
306                 default:
307                         usage();
308                 };
309         argc -= optind;
310         argv += optind;
311         grphead = NULL;
312         exphead = NULL;
313         mlhead = NULL;
314         if (argc == 1) {
315                 strncpy(exname, *argv, MAXPATHLEN-1);
316                 exname[MAXPATHLEN-1] = '\0';
317         } else
318                 strcpy(exname, _PATH_EXPORTS);
319         openlog("mountd", LOG_PID, LOG_DAEMON);
320         if (debug)
321                 warnx("getting export list");
322         get_exportlist();
323         if (debug)
324                 warnx("getting mount list");
325         get_mountlist();
326         if (debug)
327                 warnx("here we go");
328         if (debug == 0) {
329                 daemon(0, 0);
330                 signal(SIGINT, SIG_IGN);
331                 signal(SIGQUIT, SIG_IGN);
332         }
333         signal(SIGHUP, huphandler);
334         signal(SIGTERM, terminate);
335         { FILE *pidfile = fopen(_PATH_MOUNTDPID, "w");
336           if (pidfile != NULL) {
337                 fprintf(pidfile, "%d\n", getpid());
338                 fclose(pidfile);
339           }
340         }
341         rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL);
342         rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL);
343         udpsock  = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
344         tcpsock  = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
345         udpconf  = getnetconfigent("udp");
346         tcpconf  = getnetconfigent("tcp");
347         if (!have_v6)
348                 goto skip_v6;
349         udp6sock = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
350         tcp6sock = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
351         /*
352          * We're doing host-based access checks here, so don't allow
353          * v4-in-v6 to confuse things. The kernel will disable it
354          * by default on NFS sockets too.
355          */
356         if (udp6sock != -1 && setsockopt(udp6sock, IPPROTO_IPV6,
357                 IPV6_BINDV6ONLY, &one, sizeof one) < 0){
358                 syslog(LOG_ERR, "can't disable v4-in-v6 on UDP socket");
359                 exit(1);
360         }
361         if (tcp6sock != -1 && setsockopt(tcp6sock, IPPROTO_IPV6,
362                 IPV6_BINDV6ONLY, &one, sizeof one) < 0){
363                 syslog(LOG_ERR, "can't disable v4-in-v6 on UDP socket");
364                 exit(1);
365         }
366         udp6conf = getnetconfigent("udp6");
367         tcp6conf = getnetconfigent("tcp6");
368
369 skip_v6:
370         if (!resvport_only) {
371                 mib[0] = CTL_VFS;
372                 mib[1] = vfc.vfc_typenum;
373                 mib[2] = NFS_NFSPRIVPORT;
374                 if (sysctl(mib, 3, NULL, NULL, &resvport_only,
375                     sizeof(resvport_only)) != 0 && errno != ENOENT) {
376                         syslog(LOG_ERR, "sysctl: %m");
377                         exit(1);
378                 }
379         }
380         if ((udptransp = svcudp_create(RPC_ANYSOCK)) == NULL ||
381             (tcptransp = svctcp_create(RPC_ANYSOCK, 0, 0)) == NULL) {
382                 syslog(LOG_ERR, "can't create socket");
383                 exit(1);
384         }
385         if (udpsock != -1 && udpconf != NULL) {
386                 bindresvport(udpsock, NULL);
387                 udptransp = svc_dg_create(udpsock, 0, 0);
388                 if (udptransp != NULL) {
389                         if (!svc_reg(udptransp, RPCPROG_MNT, RPCMNT_VER1,
390                             mntsrv, udpconf))
391                                 syslog(LOG_WARNING, "can't register UDP RPCMNT_VER1 service");
392                         else
393                                 xcreated++;
394                         if (!force_v2) {
395                                 if (!svc_reg(udptransp, RPCPROG_MNT, RPCMNT_VER3,
396                                     mntsrv, udpconf))
397                                         syslog(LOG_WARNING, "can't register UDP RPCMNT_VER3 service");
398                                 else
399                                         xcreated++;
400                         }
401                 } else
402                         syslog(LOG_WARNING, "can't create UDP services");
403
404         }
405         if (tcpsock != -1 && tcpconf != NULL) {
406                 bindresvport(tcpsock, NULL);
407                 listen(tcpsock, SOMAXCONN);
408                 tcptransp = svc_vc_create(tcpsock, 0, 0);
409                 if (tcptransp != NULL) {
410                         if (!svc_reg(tcptransp, RPCPROG_MNT, RPCMNT_VER1,
411                             mntsrv, tcpconf))
412                                 syslog(LOG_WARNING, "can't register TCP RPCMNT_VER1 service");
413                         else
414                                 xcreated++;
415                         if (!force_v2) {
416                                 if (!svc_reg(tcptransp, RPCPROG_MNT, RPCMNT_VER3,
417                                     mntsrv, tcpconf))
418                                         syslog(LOG_WARNING, "can't register TCP RPCMNT_VER3 service");
419                                 else
420                                         xcreated++;
421                         }
422                 } else
423                         syslog(LOG_WARNING, "can't create TCP service");
424
425         }
426         if (have_v6 && udp6sock != -1 && udp6conf != NULL) {
427                 bindresvport(udp6sock, NULL);
428                 udp6transp = svc_dg_create(udp6sock, 0, 0);
429                 if (udp6transp != NULL) {
430                         if (!svc_reg(udp6transp, RPCPROG_MNT, RPCMNT_VER1,
431                             mntsrv, udp6conf))
432                                 syslog(LOG_WARNING, "can't register UDP6 RPCMNT_VER1 service");
433                         else
434                                 xcreated++;
435                         if (!force_v2) {
436                                 if (!svc_reg(udp6transp, RPCPROG_MNT, RPCMNT_VER3,
437                                     mntsrv, udp6conf))
438                                         syslog(LOG_WARNING, "can't register UDP6 RPCMNT_VER3 service");
439                                 else
440                                         xcreated++;
441                         }
442                 } else
443                         syslog(LOG_WARNING, "can't create UDP6 service");
444
445         }
446         if (have_v6 && tcp6sock != -1 && tcp6conf != NULL) {
447                 bindresvport(tcp6sock, NULL);
448                 listen(tcp6sock, SOMAXCONN);
449                 tcp6transp = svc_vc_create(tcp6sock, 0, 0);
450                 if (tcp6transp != NULL) {
451                         if (!svc_reg(tcp6transp, RPCPROG_MNT, RPCMNT_VER1,
452                             mntsrv, tcp6conf))
453                                 syslog(LOG_WARNING, "can't register TCP6 RPCMNT_VER1 service");
454                         else
455                                 xcreated++;
456                         if (!force_v2) {
457                                 if (!svc_reg(tcp6transp, RPCPROG_MNT, RPCMNT_VER3,
458                                     mntsrv, tcp6conf))
459                                         syslog(LOG_WARNING, "can't register TCP6 RPCMNT_VER3 service");
460                                         else
461                                                 xcreated++;
462                                 }
463                 } else
464                         syslog(LOG_WARNING, "can't create TCP6 service");
465
466         }
467         if (xcreated == 0) {
468                 syslog(LOG_ERR, "could not create any services");
469                 exit(1);
470         }
471
472         /* Expand svc_run() here so that we can call get_exportlist(). */
473         for (;;) {
474                 if (got_sighup) {
475                         get_exportlist();
476                         got_sighup = 0;
477                 }
478                 readfds = svc_fdset;
479                 switch (select(svc_maxfd + 1, &readfds, NULL, NULL, NULL)) {
480                 case -1:
481                         if (errno == EINTR)
482                                 continue;
483                         syslog(LOG_ERR, "mountd died: select: %m");
484                         exit(1);
485                 case 0:
486                         continue;
487                 default:
488                         svc_getreqset(&readfds);
489                 }
490         }
491 }
492
493 static void
494 usage(void)
495 {
496         fprintf(stderr,
497                 "usage: mountd [-2] [-d] [-l] [-n] [-r] [export_file]\n");
498         exit(1);
499 }
500
501 /*
502  * The mount rpc service
503  */
504 void
505 mntsrv(struct svc_req *rqstp, SVCXPRT *transp)
506 {
507         struct exportlist *ep;
508         struct dirlist *dp;
509         struct fhreturn fhr;
510         struct stat stb;
511         struct statfs fsb;
512         struct addrinfo *ai;
513         char host[NI_MAXHOST], numerichost[NI_MAXHOST];
514         int lookup_failed = 1;
515         struct sockaddr *saddr;
516         u_short sport;
517         char rpcpath[RPCMNT_PATHLEN + 1], dirpath[MAXPATHLEN];
518         int bad = 0, defset, hostset;
519         sigset_t sighup_mask;
520
521         sigemptyset(&sighup_mask);
522         sigaddset(&sighup_mask, SIGHUP);
523         saddr = svc_getrpccaller(transp)->buf;
524         switch (saddr->sa_family) {
525         case AF_INET6:
526                 sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port);
527                 break;
528         case AF_INET:
529                 sport = ntohs(((struct sockaddr_in *)saddr)->sin_port);
530                 break;
531         default:
532                 syslog(LOG_ERR, "request from unknown address family");
533                 return;
534         }
535         lookup_failed = getnameinfo(saddr, saddr->sa_len, host, sizeof host,
536             NULL, 0, 0);
537         getnameinfo(saddr, saddr->sa_len, numerichost,
538             sizeof numerichost, NULL, 0, NI_NUMERICHOST);
539         ai = NULL;
540         switch (rqstp->rq_proc) {
541         case NULLPROC:
542                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
543                         syslog(LOG_ERR, "can't send reply");
544                 return;
545         case RPCMNT_MOUNT:
546                 if (sport >= IPPORT_RESERVED && resvport_only) {
547                         syslog(LOG_NOTICE,
548                             "mount request from %s from unprivileged port",
549                             numerichost);
550                         svcerr_weakauth(transp);
551                         return;
552                 }
553                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
554                         syslog(LOG_NOTICE, "undecodable mount request from %s",
555                             numerichost);
556                         svcerr_decode(transp);
557                         return;
558                 }
559
560                 /*
561                  * Get the real pathname and make sure it is a directory
562                  * or a regular file if the -r option was specified
563                  * and it exists.
564                  */
565                 if (realpath(rpcpath, dirpath) == NULL ||
566                     stat(dirpath, &stb) < 0 ||
567                     (!S_ISDIR(stb.st_mode) &&
568                     (dir_only || !S_ISREG(stb.st_mode))) ||
569                     statfs(dirpath, &fsb) < 0) {
570                         chdir("/");     /* Just in case realpath doesn't */
571                         syslog(LOG_NOTICE,
572                             "mount request from %s for non existent path %s",
573                             numerichost, dirpath);
574                         if (debug)
575                                 warnx("stat failed on %s", dirpath);
576                         bad = ENOENT;   /* We will send error reply later */
577                 }
578
579                 /* Check in the exports list */
580                 sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
581                 ep = ex_search(&fsb.f_fsid);
582                 hostset = defset = 0;
583                 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset) ||
584                     ((dp = dirp_search(ep->ex_dirl, dirpath)) &&
585                       chk_host(dp, saddr, &defset, &hostset)) ||
586                     (defset && scan_tree(ep->ex_defdir, saddr) == 0 &&
587                      scan_tree(ep->ex_dirl, saddr) == 0))) {
588                         if (bad) {
589                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
590                                     &bad))
591                                         syslog(LOG_ERR, "can't send reply");
592                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
593                                 return;
594                         }
595                         if (hostset & DP_HOSTSET)
596                                 fhr.fhr_flag = hostset;
597                         else
598                                 fhr.fhr_flag = defset;
599                         fhr.fhr_vers = rqstp->rq_vers;
600                         /* Get the file handle */
601                         memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t));
602                         if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) {
603                                 bad = errno;
604                                 syslog(LOG_ERR, "can't get fh for %s", dirpath);
605                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
606                                     &bad))
607                                         syslog(LOG_ERR, "can't send reply");
608                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
609                                 return;
610                         }
611                         if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs, &fhr))
612                                 syslog(LOG_ERR, "can't send reply");
613                         if (!lookup_failed)
614                                 add_mlist(host, dirpath);
615                         else
616                                 add_mlist(numerichost, dirpath);
617                         if (debug)
618                                 warnx("mount successful");
619                         if (do_log)
620                                 syslog(LOG_NOTICE,
621                                     "mount request succeeded from %s for %s",
622                                     numerichost, dirpath);
623                 } else {
624                         bad = EACCES;
625                         syslog(LOG_NOTICE,
626                             "mount request denied from %s for %s",
627                             numerichost, dirpath);
628                 }
629
630                 if (bad && !svc_sendreply(transp, (xdrproc_t)xdr_long, &bad))
631                         syslog(LOG_ERR, "can't send reply");
632                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
633                 return;
634         case RPCMNT_DUMP:
635                 if (!svc_sendreply(transp, (xdrproc_t)xdr_mlist, NULL))
636                         syslog(LOG_ERR, "can't send reply");
637                 else if (do_log)
638                         syslog(LOG_NOTICE,
639                             "dump request succeeded from %s",
640                             numerichost);
641                 return;
642         case RPCMNT_UMOUNT:
643                 if (sport >= IPPORT_RESERVED && resvport_only) {
644                         syslog(LOG_NOTICE,
645                             "umount request from %s from unprivileged port",
646                             numerichost);
647                         svcerr_weakauth(transp);
648                         return;
649                 }
650                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
651                         syslog(LOG_NOTICE, "undecodable umount request from %s",
652                             numerichost);
653                         svcerr_decode(transp);
654                         return;
655                 }
656                 if (realpath(rpcpath, dirpath) == NULL) {
657                         syslog(LOG_NOTICE, "umount request from %s "
658                             "for non existent path %s",
659                             numerichost, dirpath);
660                 }
661                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
662                         syslog(LOG_ERR, "can't send reply");
663                 if (!lookup_failed)
664                         del_mlist(host, dirpath);
665                 del_mlist(numerichost, dirpath);
666                 if (do_log)
667                         syslog(LOG_NOTICE,
668                             "umount request succeeded from %s for %s",
669                             numerichost, dirpath);
670                 return;
671         case RPCMNT_UMNTALL:
672                 if (sport >= IPPORT_RESERVED && resvport_only) {
673                         syslog(LOG_NOTICE,
674                             "umountall request from %s from unprivileged port",
675                             numerichost);
676                         svcerr_weakauth(transp);
677                         return;
678                 }
679                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
680                         syslog(LOG_ERR, "can't send reply");
681                 if (!lookup_failed)
682                         del_mlist(host, NULL);
683                 del_mlist(numerichost, NULL);
684                 if (do_log)
685                         syslog(LOG_NOTICE,
686                             "umountall request succeeded from %s",
687                             numerichost);
688                 return;
689         case RPCMNT_EXPORT:
690                 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, NULL))
691                         syslog(LOG_ERR, "can't send reply");
692                 if (do_log)
693                         syslog(LOG_NOTICE,
694                             "export request succeeded from %s",
695                             numerichost);
696                 return;
697         default:
698                 svcerr_noproc(transp);
699                 return;
700         }
701 }
702
703 /*
704  * Xdr conversion for a dirpath string
705  */
706 int
707 xdr_dir(XDR *xdrsp, char *dirp)
708 {
709         return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
710 }
711
712 /*
713  * Xdr routine to generate file handle reply
714  */
715 int
716 xdr_fhs(XDR *xdrsp, caddr_t cp)
717 {
718         struct fhreturn *fhrp = (struct fhreturn *)cp;
719         u_long ok = 0, len, auth;
720
721         if (!xdr_long(xdrsp, &ok))
722                 return (0);
723         switch (fhrp->fhr_vers) {
724         case 1:
725                 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH));
726         case 3:
727                 len = NFSX_V3FH;
728                 if (!xdr_long(xdrsp, &len))
729                         return (0);
730                 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len))
731                         return (0);
732                 if (fhrp->fhr_flag & DP_KERB)
733                         auth = RPCAUTH_KERB4;
734                 else
735                         auth = RPCAUTH_UNIX;
736                 len = 1;
737                 if (!xdr_long(xdrsp, &len))
738                         return (0);
739                 return (xdr_long(xdrsp, &auth));
740         };
741         return (0);
742 }
743
744 int
745 xdr_mlist(XDR *xdrsp, caddr_t cp)
746 {
747         struct mountlist *mlp;
748         int true = 1;
749         int false = 0;
750         char *strp;
751
752         mlp = mlhead;
753         while (mlp) {
754                 if (!xdr_bool(xdrsp, &true))
755                         return (0);
756                 strp = &mlp->ml_host[0];
757                 if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
758                         return (0);
759                 strp = &mlp->ml_dirp[0];
760                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
761                         return (0);
762                 mlp = mlp->ml_next;
763         }
764         if (!xdr_bool(xdrsp, &false))
765                 return (0);
766         return (1);
767 }
768
769 /*
770  * Xdr conversion for export list
771  */
772 int
773 xdr_explist(XDR *xdrsp, caddr_t cp)
774 {
775         struct exportlist *ep;
776         int false = 0;
777         int putdef;
778         sigset_t sighup_mask;
779
780         sigemptyset(&sighup_mask);
781         sigaddset(&sighup_mask, SIGHUP);
782         sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
783         ep = exphead;
784         while (ep) {
785                 putdef = 0;
786                 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir, &putdef))
787                         goto errout;
788                 if (ep->ex_defdir && putdef == 0 &&
789                         put_exlist(ep->ex_defdir, xdrsp, NULL,
790                         &putdef))
791                         goto errout;
792                 ep = ep->ex_next;
793         }
794         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
795         if (!xdr_bool(xdrsp, &false))
796                 return (0);
797         return (1);
798 errout:
799         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
800         return (0);
801 }
802
803 /*
804  * Called from xdr_explist() to traverse the tree and export the
805  * directory paths.
806  */
807 int
808 put_exlist(struct dirlist *dp, XDR *xdrsp, struct dirlist *adp, int *putdefp)
809 {
810         struct grouplist *grp;
811         struct hostlist *hp;
812         int true = 1;
813         int false = 0;
814         int gotalldir = 0;
815         char *strp;
816
817         if (dp) {
818                 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp))
819                         return (1);
820                 if (!xdr_bool(xdrsp, &true))
821                         return (1);
822                 strp = dp->dp_dirp;
823                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
824                         return (1);
825                 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) {
826                         gotalldir = 1;
827                         *putdefp = 1;
828                 }
829                 if ((dp->dp_flag & DP_DEFSET) == 0 &&
830                     (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) {
831                         hp = dp->dp_hosts;
832                         while (hp) {
833                                 grp = hp->ht_grp;
834                                 if (grp->gr_type == GT_HOST) {
835                                         if (!xdr_bool(xdrsp, &true))
836                                                 return (1);
837                                         strp = grp->gr_ptr.gt_addrinfo->ai_canonname;
838                                         if (!xdr_string(xdrsp, &strp,
839                                             RPCMNT_NAMELEN))
840                                                 return (1);
841                                 } else if (grp->gr_type == GT_NET) {
842                                         if (!xdr_bool(xdrsp, &true))
843                                                 return (1);
844                                         strp = grp->gr_ptr.gt_net.nt_name;
845                                         if (!xdr_string(xdrsp, &strp,
846                                             RPCMNT_NAMELEN))
847                                                 return (1);
848                                 }
849                                 hp = hp->ht_next;
850                                 if (gotalldir && hp == NULL) {
851                                         hp = adp->dp_hosts;
852                                         gotalldir = 0;
853                                 }
854                         }
855                 }
856                 if (!xdr_bool(xdrsp, &false))
857                         return (1);
858                 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp))
859                         return (1);
860         }
861         return (0);
862 }
863
864 #define LINESIZ 10240
865 char line[LINESIZ];
866 FILE *exp_file;
867
868 /*
869  * Get the export list
870  */
871 void
872 get_exportlist(void)
873 {
874         struct exportlist *ep, *ep2;
875         struct grouplist *grp, *tgrp;
876         struct exportlist **epp;
877         struct dirlist *dirhead;
878         struct statfs fsb, *fsp;
879         struct ucred anon;
880         char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc;
881         int len, has_host, exflags, got_nondir, dirplen, num, i, netgrp;
882
883         dirp = NULL;
884         dirplen = 0;
885
886         /*
887          * First, get rid of the old list
888          */
889         ep = exphead;
890         while (ep) {
891                 ep2 = ep;
892                 ep = ep->ex_next;
893                 free_exp(ep2);
894         }
895         exphead = NULL;
896
897         grp = grphead;
898         while (grp) {
899                 tgrp = grp;
900                 grp = grp->gr_next;
901                 free_grp(tgrp);
902         }
903         grphead = NULL;
904
905         /*
906          * And delete exports that are in the kernel for all local
907          * file systems.
908          * XXX: Should know how to handle all local exportable file systems
909          *      instead of just "ufs".
910          */
911         num = getmntinfo(&fsp, MNT_NOWAIT);
912         for (i = 0; i < num; i++) {
913                 union {
914                         struct ufs_args ua;
915                         struct iso_args ia;
916                         struct mfs_args ma;
917                         struct msdosfs_args da;
918                         struct ntfs_args na;
919                 } targs;
920                 struct export_args export;
921
922                 export.ex_flags = MNT_DELEXPORT;
923                 if (mountctl(fsp->f_mntonname, MOUNTCTL_SET_EXPORT, -1,
924                              &export, sizeof(export), NULL, 0) == 0) {
925                 } else if (!strcmp(fsp->f_fstypename, "mfs") ||
926                     !strcmp(fsp->f_fstypename, "ufs") ||
927                     !strcmp(fsp->f_fstypename, "msdos") ||
928                     !strcmp(fsp->f_fstypename, "ntfs") ||
929                     !strcmp(fsp->f_fstypename, "cd9660")) {
930                         targs.ua.fspec = NULL;
931                         targs.ua.export.ex_flags = MNT_DELEXPORT;
932                         if (mount(fsp->f_fstypename, fsp->f_mntonname,
933                                   fsp->f_flags | MNT_UPDATE,
934                                   (caddr_t)&targs) < 0)
935                                 syslog(LOG_ERR, "can't delete exports for %s",
936                                     fsp->f_mntonname);
937                 }
938                 fsp++;
939         }
940
941         /*
942          * Read in the exports file and build the list, calling
943          * mount() as we go along to push the export rules into the kernel.
944          */
945         if ((exp_file = fopen(exname, "r")) == NULL) {
946                 syslog(LOG_ERR, "can't open %s", exname);
947                 exit(2);
948         }
949         dirhead = NULL;
950         while (get_line()) {
951                 if (debug)
952                         warnx("got line %s", line);
953                 cp = line;
954                 nextfield(&cp, &endcp);
955                 if (*cp == '#')
956                         goto nextline;
957
958                 /*
959                  * Set defaults.
960                  */
961                 has_host = FALSE;
962                 anon = def_anon;
963                 exflags = MNT_EXPORTED;
964                 got_nondir = 0;
965                 opt_flags = 0;
966                 ep = NULL;
967
968                 /*
969                  * Create new exports list entry
970                  */
971                 len = endcp-cp;
972                 tgrp = grp = get_grp();
973                 while (len > 0) {
974                         if (len > RPCMNT_NAMELEN) {
975                             getexp_err(ep, tgrp);
976                             goto nextline;
977                         }
978                         if (*cp == '-') {
979                             if (ep == NULL) {
980                                 getexp_err(ep, tgrp);
981                                 goto nextline;
982                             }
983                             if (debug)
984                                 warnx("doing opt %s", cp);
985                             got_nondir = 1;
986                             if (do_opt(&cp, &endcp, ep, grp, &has_host,
987                                 &exflags, &anon)) {
988                                 getexp_err(ep, tgrp);
989                                 goto nextline;
990                             }
991                         } else if (*cp == '/') {
992                             savedc = *endcp;
993                             *endcp = '\0';
994                             if (check_dirpath(cp) &&
995                                 statfs(cp, &fsb) >= 0) {
996                                 if (got_nondir) {
997                                     syslog(LOG_ERR, "dirs must be first");
998                                     getexp_err(ep, tgrp);
999                                     goto nextline;
1000                                 }
1001                                 if (ep) {
1002                                     if (ep->ex_fs.val[0] != fsb.f_fsid.val[0] ||
1003                                         ep->ex_fs.val[1] != fsb.f_fsid.val[1]) {
1004                                         getexp_err(ep, tgrp);
1005                                         goto nextline;
1006                                     }
1007                                 } else {
1008                                     /*
1009                                      * See if this directory is already
1010                                      * in the list.
1011                                      */
1012                                     ep = ex_search(&fsb.f_fsid);
1013                                     if (ep == NULL) {
1014                                         ep = get_exp();
1015                                         ep->ex_fs = fsb.f_fsid;
1016                                         ep->ex_fsdir = (char *)
1017                                             malloc(strlen(fsb.f_mntonname) + 1);
1018                                         if (ep->ex_fsdir)
1019                                             strcpy(ep->ex_fsdir,
1020                                                 fsb.f_mntonname);
1021                                         else
1022                                             out_of_mem();
1023                                         if (debug)
1024                                                 warnx("making new ep fs=0x%x,0x%x",
1025                                                     fsb.f_fsid.val[0],
1026                                                     fsb.f_fsid.val[1]);
1027                                     } else if (debug)
1028                                         warnx("found ep fs=0x%x,0x%x",
1029                                             fsb.f_fsid.val[0],
1030                                             fsb.f_fsid.val[1]);
1031                                 }
1032
1033                                 /*
1034                                  * Add dirpath to export mount point.
1035                                  */
1036                                 dirp = add_expdir(&dirhead, cp, len);
1037                                 dirplen = len;
1038                             } else {
1039                                 getexp_err(ep, tgrp);
1040                                 goto nextline;
1041                             }
1042                             *endcp = savedc;
1043                         } else {
1044                             savedc = *endcp;
1045                             *endcp = '\0';
1046                             got_nondir = 1;
1047                             if (ep == NULL) {
1048                                 getexp_err(ep, tgrp);
1049                                 goto nextline;
1050                             }
1051
1052                             /*
1053                              * Get the host or netgroup.
1054                              */
1055                             setnetgrent(cp);
1056                             netgrp = getnetgrent(&hst, &usr, &dom);
1057                             do {
1058                                 if (has_host) {
1059                                     grp->gr_next = get_grp();
1060                                     grp = grp->gr_next;
1061                                 }
1062                                 if (netgrp) {
1063                                     if (hst == NULL) {
1064                                         syslog(LOG_ERR,
1065                                 "null hostname in netgroup %s, skipping", cp);
1066                                         grp->gr_type = GT_IGNORE;
1067                                     } else if (get_host(hst, grp, tgrp)) {
1068                                         syslog(LOG_ERR,
1069                         "bad host %s in netgroup %s, skipping", hst, cp);
1070                                         grp->gr_type = GT_IGNORE;
1071                                     }
1072                                 } else if (get_host(cp, grp, tgrp)) {
1073                                     syslog(LOG_ERR, "bad host %s, skipping", cp);
1074                                     grp->gr_type = GT_IGNORE;
1075                                 }
1076                                 has_host = TRUE;
1077                             } while (netgrp && getnetgrent(&hst, &usr, &dom));
1078                             endnetgrent();
1079                             *endcp = savedc;
1080                         }
1081                         cp = endcp;
1082                         nextfield(&cp, &endcp);
1083                         len = endcp - cp;
1084                 }
1085                 if (check_options(dirhead)) {
1086                         getexp_err(ep, tgrp);
1087                         goto nextline;
1088                 }
1089                 if (!has_host) {
1090                         grp->gr_type = GT_DEFAULT;
1091                         if (debug)
1092                                 warnx("adding a default entry");
1093
1094                 /*
1095                  * Don't allow a network export coincide with a list of
1096                  * host(s) on the same line.
1097                  */
1098                 } else if ((opt_flags & OP_NET) && tgrp->gr_next) {
1099                         getexp_err(ep, tgrp);
1100                         goto nextline;
1101
1102                 /*
1103                  * If an export list was specified on this line, make sure
1104                  * that we have at least one valid entry, otherwise skip it.
1105                  */
1106                 } else {
1107                         grp = tgrp;
1108                         while (grp && grp->gr_type == GT_IGNORE)
1109                                 grp = grp->gr_next;
1110                         if (! grp) {
1111                             getexp_err(ep, tgrp);
1112                             goto nextline;
1113                         }
1114                 }
1115
1116                 /*
1117                  * Loop through hosts, pushing the exports into the kernel.
1118                  * After loop, tgrp points to the start of the list and
1119                  * grp points to the last entry in the list.
1120                  */
1121                 grp = tgrp;
1122                 do {
1123                         if (do_mount(ep, grp, exflags, &anon, dirp, dirplen,
1124                             &fsb)) {
1125                                 getexp_err(ep, tgrp);
1126                                 goto nextline;
1127                         }
1128                 } while (grp->gr_next && (grp = grp->gr_next));
1129
1130                 /*
1131                  * Success. Update the data structures.
1132                  */
1133                 if (has_host) {
1134                         hang_dirp(dirhead, tgrp, ep, opt_flags);
1135                         grp->gr_next = grphead;
1136                         grphead = tgrp;
1137                 } else {
1138                         hang_dirp(dirhead, NULL, ep,
1139                                 opt_flags);
1140                         free_grp(grp);
1141                 }
1142                 dirhead = NULL;
1143                 if ((ep->ex_flag & EX_LINKED) == 0) {
1144                         ep2 = exphead;
1145                         epp = &exphead;
1146
1147                         /*
1148                          * Insert in the list in alphabetical order.
1149                          */
1150                         while (ep2 && strcmp(ep2->ex_fsdir, ep->ex_fsdir) < 0) {
1151                                 epp = &ep2->ex_next;
1152                                 ep2 = ep2->ex_next;
1153                         }
1154                         if (ep2)
1155                                 ep->ex_next = ep2;
1156                         *epp = ep;
1157                         ep->ex_flag |= EX_LINKED;
1158                 }
1159 nextline:
1160                 if (dirhead) {
1161                         free_dir(dirhead);
1162                         dirhead = NULL;
1163                 }
1164         }
1165         fclose(exp_file);
1166 }
1167
1168 /*
1169  * Allocate an export list element
1170  */
1171 struct exportlist *
1172 get_exp(void)
1173 {
1174         struct exportlist *ep;
1175
1176         ep = (struct exportlist *)malloc(sizeof (struct exportlist));
1177         if (ep == NULL)
1178                 out_of_mem();
1179         memset(ep, 0, sizeof(struct exportlist));
1180         return (ep);
1181 }
1182
1183 /*
1184  * Allocate a group list element
1185  */
1186 struct grouplist *
1187 get_grp(void)
1188 {
1189         struct grouplist *gp;
1190
1191         gp = (struct grouplist *)malloc(sizeof (struct grouplist));
1192         if (gp == NULL)
1193                 out_of_mem();
1194         memset(gp, 0, sizeof(struct grouplist));
1195         return (gp);
1196 }
1197
1198 /*
1199  * Clean up upon an error in get_exportlist().
1200  */
1201 void
1202 getexp_err(struct exportlist *ep, struct grouplist *grp)
1203 {
1204         struct grouplist *tgrp;
1205
1206         if (!(opt_flags & OP_QUIET))
1207                 syslog(LOG_ERR, "bad exports list line %s", line);
1208         if (ep && (ep->ex_flag & EX_LINKED) == 0)
1209                 free_exp(ep);
1210         while (grp) {
1211                 tgrp = grp;
1212                 grp = grp->gr_next;
1213                 free_grp(tgrp);
1214         }
1215 }
1216
1217 /*
1218  * Search the export list for a matching fs.
1219  */
1220 struct exportlist *
1221 ex_search(fsid_t *fsid)
1222 {
1223         struct exportlist *ep;
1224
1225         ep = exphead;
1226         while (ep) {
1227                 if (ep->ex_fs.val[0] == fsid->val[0] &&
1228                     ep->ex_fs.val[1] == fsid->val[1])
1229                         return (ep);
1230                 ep = ep->ex_next;
1231         }
1232         return (ep);
1233 }
1234
1235 /*
1236  * Add a directory path to the list.
1237  */
1238 char *
1239 add_expdir(struct dirlist **dpp, char *cp, int len)
1240 {
1241         struct dirlist *dp;
1242
1243         dp = (struct dirlist *)malloc(sizeof (struct dirlist) + len);
1244         if (dp == NULL)
1245                 out_of_mem();
1246         dp->dp_left = *dpp;
1247         dp->dp_right = NULL;
1248         dp->dp_flag = 0;
1249         dp->dp_hosts = NULL;
1250         strcpy(dp->dp_dirp, cp);
1251         *dpp = dp;
1252         return (dp->dp_dirp);
1253 }
1254
1255 /*
1256  * Hang the dir list element off the dirpath binary tree as required
1257  * and update the entry for host.
1258  */
1259 void
1260 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep,
1261           int flags)
1262 {
1263         struct hostlist *hp;
1264         struct dirlist *dp2;
1265
1266         if (flags & OP_ALLDIRS) {
1267                 if (ep->ex_defdir)
1268                         free((caddr_t)dp);
1269                 else
1270                         ep->ex_defdir = dp;
1271                 if (grp == NULL) {
1272                         ep->ex_defdir->dp_flag |= DP_DEFSET;
1273                         if (flags & OP_KERB)
1274                                 ep->ex_defdir->dp_flag |= DP_KERB;
1275                 } else while (grp) {
1276                         hp = get_ht();
1277                         if (flags & OP_KERB)
1278                                 hp->ht_flag |= DP_KERB;
1279                         hp->ht_grp = grp;
1280                         hp->ht_next = ep->ex_defdir->dp_hosts;
1281                         ep->ex_defdir->dp_hosts = hp;
1282                         grp = grp->gr_next;
1283                 }
1284         } else {
1285
1286                 /*
1287                  * Loop through the directories adding them to the tree.
1288                  */
1289                 while (dp) {
1290                         dp2 = dp->dp_left;
1291                         add_dlist(&ep->ex_dirl, dp, grp, flags);
1292                         dp = dp2;
1293                 }
1294         }
1295 }
1296
1297 /*
1298  * Traverse the binary tree either updating a node that is already there
1299  * for the new directory or adding the new node.
1300  */
1301 void
1302 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp,
1303           int flags)
1304 {
1305         struct dirlist *dp;
1306         struct hostlist *hp;
1307         int cmp;
1308
1309         dp = *dpp;
1310         if (dp) {
1311                 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp);
1312                 if (cmp > 0) {
1313                         add_dlist(&dp->dp_left, newdp, grp, flags);
1314                         return;
1315                 } else if (cmp < 0) {
1316                         add_dlist(&dp->dp_right, newdp, grp, flags);
1317                         return;
1318                 } else
1319                         free((caddr_t)newdp);
1320         } else {
1321                 dp = newdp;
1322                 dp->dp_left = NULL;
1323                 *dpp = dp;
1324         }
1325         if (grp) {
1326
1327                 /*
1328                  * Hang all of the host(s) off of the directory point.
1329                  */
1330                 do {
1331                         hp = get_ht();
1332                         if (flags & OP_KERB)
1333                                 hp->ht_flag |= DP_KERB;
1334                         hp->ht_grp = grp;
1335                         hp->ht_next = dp->dp_hosts;
1336                         dp->dp_hosts = hp;
1337                         grp = grp->gr_next;
1338                 } while (grp);
1339         } else {
1340                 dp->dp_flag |= DP_DEFSET;
1341                 if (flags & OP_KERB)
1342                         dp->dp_flag |= DP_KERB;
1343         }
1344 }
1345
1346 /*
1347  * Search for a dirpath on the export point.
1348  */
1349 struct dirlist *
1350 dirp_search(struct dirlist *dp, char *dirp)
1351 {
1352         int cmp;
1353
1354         if (dp) {
1355                 cmp = strcmp(dp->dp_dirp, dirp);
1356                 if (cmp > 0)
1357                         return (dirp_search(dp->dp_left, dirp));
1358                 else if (cmp < 0)
1359                         return (dirp_search(dp->dp_right, dirp));
1360                 else
1361                         return (dp);
1362         }
1363         return (dp);
1364 }
1365
1366 /*
1367  * Some helper functions for netmasks. They all assume masks in network
1368  * order (big endian).
1369  */
1370 static int
1371 bitcmp(void *dst, void *src, int bitlen)
1372 {
1373         int i;
1374         u_int8_t *p1 = dst, *p2 = src;
1375         u_int8_t bitmask;
1376         int bytelen, bitsleft;
1377
1378         bytelen = bitlen / 8;
1379         bitsleft = bitlen % 8;
1380
1381         if (debug) {
1382                 printf("comparing:\n");
1383                 for (i = 0; i < (bitsleft ? bytelen + 1 : bytelen); i++)
1384                         printf("%02x", p1[i]);
1385                 printf("\n");
1386                 for (i = 0; i < (bitsleft ? bytelen + 1 : bytelen); i++)
1387                         printf("%02x", p2[i]);
1388                 printf("\n");
1389         }
1390
1391         for (i = 0; i < bytelen; i++) {
1392                 if (*p1 != *p2)
1393                         return 1;
1394                 p1++;
1395                 p2++;
1396         }
1397
1398         for (i = 0; i < bitsleft; i++) {
1399                 bitmask = 1 << (7 - i);
1400                 if ((*p1 & bitmask) != (*p2 & bitmask))
1401                         return 1;
1402         }
1403
1404         return 0;
1405 }
1406
1407 /*
1408  * Scan for a host match in a directory tree.
1409  */
1410 int
1411 chk_host(struct dirlist *dp, struct sockaddr *saddr, int *defsetp,
1412          int *hostsetp)
1413 {
1414         struct hostlist *hp;
1415         struct grouplist *grp;
1416         struct addrinfo *ai;
1417
1418         if (dp) {
1419                 if (dp->dp_flag & DP_DEFSET)
1420                         *defsetp = dp->dp_flag;
1421                 hp = dp->dp_hosts;
1422                 while (hp) {
1423                         grp = hp->ht_grp;
1424                         switch (grp->gr_type) {
1425                         case GT_HOST:
1426                                 ai = grp->gr_ptr.gt_addrinfo;
1427                                 for (; ai; ai = ai->ai_next) {
1428                                         if (!sacmp(ai->ai_addr, saddr)) {
1429                                                 *hostsetp =
1430                                                     (hp->ht_flag | DP_HOSTSET);
1431                                                 return (1);
1432                                         }
1433                                 }
1434                             break;
1435                         case GT_NET:
1436                                 if (!netpartcmp(saddr,
1437                                     (struct sockaddr *) &grp->gr_ptr.gt_net.nt_net,
1438                                      grp->gr_ptr.gt_net.nt_mask)) {
1439                                         *hostsetp = (hp->ht_flag | DP_HOSTSET);
1440                                         return (1);
1441                                 }
1442                             break;
1443                         };
1444                         hp = hp->ht_next;
1445                 }
1446         }
1447         return (0);
1448 }
1449
1450 /*
1451  * Scan tree for a host that matches the address.
1452  */
1453 int
1454 scan_tree(struct dirlist *dp, struct sockaddr *saddr)
1455 {
1456         int defset, hostset;
1457
1458         if (dp) {
1459                 if (scan_tree(dp->dp_left, saddr))
1460                         return (1);
1461                 if (chk_host(dp, saddr, &defset, &hostset))
1462                         return (1);
1463                 if (scan_tree(dp->dp_right, saddr))
1464                         return (1);
1465         }
1466         return (0);
1467 }
1468
1469 /*
1470  * Traverse the dirlist tree and free it up.
1471  */
1472 void
1473 free_dir(struct dirlist *dp)
1474 {
1475
1476         if (dp) {
1477                 free_dir(dp->dp_left);
1478                 free_dir(dp->dp_right);
1479                 free_host(dp->dp_hosts);
1480                 free((caddr_t)dp);
1481         }
1482 }
1483
1484 /*
1485  * Parse the option string and update fields.
1486  * Option arguments may either be -<option>=<value> or
1487  * -<option> <value>
1488  */
1489 int
1490 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp,
1491        int *has_hostp, int *exflagsp, struct ucred *cr)
1492 {
1493         char *cpoptarg, *cpoptend;
1494         char *cp, *endcp, *cpopt, savedc, savedc2;
1495         int allflag, usedarg;
1496
1497         savedc2 = '\0';
1498         cpopt = *cpp;
1499         cpopt++;
1500         cp = *endcpp;
1501         savedc = *cp;
1502         *cp = '\0';
1503         while (cpopt && *cpopt) {
1504                 allflag = 1;
1505                 usedarg = -2;
1506                 if ((cpoptend = strchr(cpopt, ','))) {
1507                         *cpoptend++ = '\0';
1508                         if ((cpoptarg = strchr(cpopt, '=')))
1509                                 *cpoptarg++ = '\0';
1510                 } else {
1511                         if ((cpoptarg = strchr(cpopt, '=')))
1512                                 *cpoptarg++ = '\0';
1513                         else {
1514                                 *cp = savedc;
1515                                 nextfield(&cp, &endcp);
1516                                 **endcpp = '\0';
1517                                 if (endcp > cp && *cp != '-') {
1518                                         cpoptarg = cp;
1519                                         savedc2 = *endcp;
1520                                         *endcp = '\0';
1521                                         usedarg = 0;
1522                                 }
1523                         }
1524                 }
1525                 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) {
1526                         *exflagsp |= MNT_EXRDONLY;
1527                 } else if (cpoptarg && (!strcmp(cpopt, "maproot") ||
1528                     !(allflag = strcmp(cpopt, "mapall")) ||
1529                     !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) {
1530                         usedarg++;
1531                         parsecred(cpoptarg, cr);
1532                         if (allflag == 0) {
1533                                 *exflagsp |= MNT_EXPORTANON;
1534                                 opt_flags |= OP_MAPALL;
1535                         } else
1536                                 opt_flags |= OP_MAPROOT;
1537                 } else if (!strcmp(cpopt, "kerb") || !strcmp(cpopt, "k")) {
1538                         *exflagsp |= MNT_EXKERB;
1539                         opt_flags |= OP_KERB;
1540                 } else if (cpoptarg && (!strcmp(cpopt, "mask") ||
1541                         !strcmp(cpopt, "m"))) {
1542                         if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) {
1543                                 syslog(LOG_ERR, "bad mask: %s", cpoptarg);
1544                                 return (1);
1545                         }
1546                         usedarg++;
1547                         opt_flags |= OP_MASK;
1548                 } else if (cpoptarg && (!strcmp(cpopt, "network") ||
1549                         !strcmp(cpopt, "n"))) {
1550                         if (strchr(cpoptarg, '/') != NULL) {
1551                                 if (debug)
1552                                         fprintf(stderr, "setting OP_MASKLEN\n");
1553                                 opt_flags |= OP_MASKLEN;
1554                         }
1555                         if (grp->gr_type != GT_NULL) {
1556                                 syslog(LOG_ERR, "network/host conflict");
1557                                 return (1);
1558                         } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) {
1559                                 syslog(LOG_ERR, "bad net: %s", cpoptarg);
1560                                 return (1);
1561                         }
1562                         grp->gr_type = GT_NET;
1563                         *has_hostp = 1;
1564                         usedarg++;
1565                         opt_flags |= OP_NET;
1566                 } else if (!strcmp(cpopt, "alldirs")) {
1567                         opt_flags |= OP_ALLDIRS;
1568                 } else if (!strcmp(cpopt, "public")) {
1569                         *exflagsp |= MNT_EXPUBLIC;
1570                 } else if (!strcmp(cpopt, "webnfs")) {
1571                         *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON);
1572                         opt_flags |= OP_MAPALL;
1573                 } else if (cpoptarg && !strcmp(cpopt, "index")) {
1574                         ep->ex_indexfile = strdup(cpoptarg);
1575                 } else if (!strcmp(cpopt, "quiet")) {
1576                         opt_flags |= OP_QUIET;
1577                 } else {
1578                         syslog(LOG_ERR, "bad opt %s", cpopt);
1579                         return (1);
1580                 }
1581                 if (usedarg >= 0) {
1582                         *endcp = savedc2;
1583                         **endcpp = savedc;
1584                         if (usedarg > 0) {
1585                                 *cpp = cp;
1586                                 *endcpp = endcp;
1587                         }
1588                         return (0);
1589                 }
1590                 cpopt = cpoptend;
1591         }
1592         **endcpp = savedc;
1593         return (0);
1594 }
1595
1596 /*
1597  * Translate a character string to the corresponding list of network
1598  * addresses for a hostname.
1599  */
1600 int
1601 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp)
1602 {
1603         struct grouplist *checkgrp;
1604         struct addrinfo *ai, *tai, hints;
1605         int ecode;
1606         char host[NI_MAXHOST];
1607
1608         if (grp->gr_type != GT_NULL) {
1609                 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp);
1610                 return (1);
1611         }
1612         memset(&hints, 0, sizeof hints);
1613         hints.ai_flags = AI_CANONNAME;
1614         hints.ai_protocol = IPPROTO_UDP;
1615         ecode = getaddrinfo(cp, NULL, &hints, &ai);
1616         if (ecode != 0) {
1617                 syslog(LOG_ERR,"can't get address info for host %s", cp);
1618                 return 1;
1619         }
1620         grp->gr_ptr.gt_addrinfo = ai;
1621         while (ai != NULL) {
1622                 if (ai->ai_canonname == NULL) {
1623                         if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host,
1624                             sizeof host, NULL, 0, ninumeric) != 0)
1625                                 strlcpy(host, "?", sizeof(host));
1626                         ai->ai_canonname = strdup(host);
1627                         ai->ai_flags |= AI_CANONNAME;
1628                 }
1629                 if (debug)
1630                         fprintf(stderr, "got host %s\n", ai->ai_canonname);
1631                 /*
1632                  * Sanity check: make sure we don't already have an entry
1633                  * for this host in the grouplist.
1634                  */
1635                 for (checkgrp = tgrp; checkgrp != NULL;
1636                     checkgrp = checkgrp->gr_next) {
1637                         if (checkgrp->gr_type != GT_HOST)
1638                                 continue;
1639                         for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL;
1640                             tai = tai->ai_next) {
1641                                 if (sacmp(tai->ai_addr, ai->ai_addr) != 0)
1642                                         continue;
1643                                 if (debug)
1644                                         fprintf(stderr,
1645                                             "ignoring duplicate host %s\n",
1646                                             ai->ai_canonname);
1647                                 grp->gr_type = GT_IGNORE;
1648                                 return (0);
1649                         }
1650                 }
1651                 ai = ai->ai_next;
1652         }
1653         grp->gr_type = GT_HOST;
1654         return (0);
1655 }
1656
1657 /*
1658  * Free up an exports list component
1659  */
1660 void
1661 free_exp(struct exportlist *ep)
1662 {
1663
1664         if (ep->ex_defdir) {
1665                 free_host(ep->ex_defdir->dp_hosts);
1666                 free((caddr_t)ep->ex_defdir);
1667         }
1668         if (ep->ex_fsdir)
1669                 free(ep->ex_fsdir);
1670         if (ep->ex_indexfile)
1671                 free(ep->ex_indexfile);
1672         free_dir(ep->ex_dirl);
1673         free((caddr_t)ep);
1674 }
1675
1676 /*
1677  * Free hosts.
1678  */
1679 void
1680 free_host(struct hostlist *hp)
1681 {
1682         struct hostlist *hp2;
1683
1684         while (hp) {
1685                 hp2 = hp;
1686                 hp = hp->ht_next;
1687                 free((caddr_t)hp2);
1688         }
1689 }
1690
1691 struct hostlist *
1692 get_ht(void)
1693 {
1694         struct hostlist *hp;
1695
1696         hp = (struct hostlist *)malloc(sizeof (struct hostlist));
1697         if (hp == NULL)
1698                 out_of_mem();
1699         hp->ht_next = NULL;
1700         hp->ht_flag = 0;
1701         return (hp);
1702 }
1703
1704 /*
1705  * Out of memory, fatal
1706  */
1707 void
1708 out_of_mem(void)
1709 {
1710
1711         syslog(LOG_ERR, "out of memory");
1712         exit(2);
1713 }
1714
1715 /*
1716  * Do the mount syscall with the update flag to push the export info into
1717  * the kernel.
1718  */
1719 int
1720 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags,
1721          struct ucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb)
1722 {
1723         struct statfs fsb1;
1724         struct sockaddr_storage ss;
1725         struct addrinfo *ai;
1726         char *cp = NULL;
1727         int done;
1728         char savedc = '\0';
1729         union {
1730                 struct ufs_args ua;
1731                 struct iso_args ia;
1732                 struct mfs_args ma;
1733 #ifdef __NetBSD__
1734                 struct msdosfs_args da;
1735                 struct adosfs_args aa;
1736 #endif
1737                 struct ntfs_args na;
1738         } args;
1739
1740         args.ua.fspec = 0;
1741         args.ua.export.ex_flags = exflags;
1742         args.ua.export.ex_anon = *anoncrp;
1743         args.ua.export.ex_indexfile = ep->ex_indexfile;
1744         if (grp->gr_type == GT_HOST)
1745                 ai = grp->gr_ptr.gt_addrinfo;
1746         else
1747                 ai = NULL;
1748         done = FALSE;
1749         while (!done) {
1750                 switch (grp->gr_type) {
1751                 case GT_HOST:
1752                         if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0)
1753                                 goto skip;
1754                         args.ua.export.ex_addr = ai->ai_addr;
1755                         args.ua.export.ex_addrlen = ai->ai_addrlen;
1756                         args.ua.export.ex_masklen = 0;
1757                         break;
1758                 case GT_NET:
1759                         args.ua.export.ex_addr = (struct sockaddr *)
1760                             &grp->gr_ptr.gt_net.nt_net;
1761                         if (args.ua.export.ex_addr->sa_family == AF_INET6 &&
1762                             have_v6 == 0)
1763                                 goto skip;
1764                         args.ua.export.ex_addrlen =
1765                             args.ua.export.ex_addr->sa_len;
1766                         memset(&ss, 0, sizeof ss);
1767                         ss.ss_family = args.ua.export.ex_addr->sa_family;
1768                         ss.ss_len = args.ua.export.ex_addr->sa_len;
1769                         if (allones(&ss, grp->gr_ptr.gt_net.nt_mask) != 0) {
1770                                 syslog(LOG_ERR, "Bad network flag");
1771                                 if (cp)
1772                                         *cp = savedc;
1773                                 return (1);
1774                         }
1775                         args.ua.export.ex_mask = (struct sockaddr *)&ss;
1776                         args.ua.export.ex_masklen = ss.ss_len;
1777                         break;
1778                 case GT_DEFAULT:
1779                         args.ua.export.ex_addr = NULL;
1780                         args.ua.export.ex_addrlen = 0;
1781                         args.ua.export.ex_mask = NULL;
1782                         args.ua.export.ex_masklen = 0;
1783                         break;
1784                 case GT_IGNORE:
1785                         return(0);
1786                         break;
1787                 default:
1788                         syslog(LOG_ERR, "bad grouptype");
1789                         if (cp)
1790                                 *cp = savedc;
1791                         return (1);
1792                 };
1793
1794                 /*
1795                  * XXX:
1796                  * Maybe I should just use the fsb->f_mntonname path instead
1797                  * of looping back up the dirp to the mount point??
1798                  * Also, needs to know how to export all types of local
1799                  * exportable file systems and not just "ufs".
1800                  */
1801                 for (;;) {
1802                         int r;
1803
1804                         r = mountctl(fsb->f_mntonname, MOUNTCTL_SET_EXPORT,
1805                                      -1,
1806                                      &args.ua.export, sizeof(args.ua.export),
1807                                      NULL, 0);
1808                         if (r < 0 && errno == EOPNOTSUPP) {
1809                                 r = mount(fsb->f_fstypename, dirp,
1810                                           fsb->f_flags | MNT_UPDATE,
1811                                           (caddr_t)&args);
1812                         }
1813                         if (r >= 0)
1814                                 break;
1815                         if (cp)
1816                                 *cp-- = savedc;
1817                         else
1818                                 cp = dirp + dirplen - 1;
1819                         if (opt_flags & OP_QUIET)
1820                                 return (1);
1821                         if (errno == EPERM) {
1822                                 if (debug)
1823                                         warnx("can't change attributes for %s",
1824                                             dirp);
1825                                 syslog(LOG_ERR,
1826                                    "can't change attributes for %s", dirp);
1827                                 return (1);
1828                         }
1829                         if (opt_flags & OP_ALLDIRS) {
1830                                 if (errno == EINVAL)
1831                                         syslog(LOG_ERR,
1832                 "-alldirs requested but %s is not a filesystem mountpoint",
1833                                                 dirp);
1834                                 else
1835                                         syslog(LOG_ERR,
1836                                                 "could not remount %s: %m",
1837                                                 dirp);
1838                                 return (1);
1839                         }
1840                         /* back up over the last component */
1841                         while (*cp == '/' && cp > dirp)
1842                                 cp--;
1843                         while (*(cp - 1) != '/' && cp > dirp)
1844                                 cp--;
1845                         if (cp == dirp) {
1846                                 if (debug)
1847                                         warnx("mnt unsucc");
1848                                 syslog(LOG_ERR, "can't export %s", dirp);
1849                                 return (1);
1850                         }
1851                         savedc = *cp;
1852                         *cp = '\0';
1853                         /* Check that we're still on the same filesystem. */
1854                         if (statfs(dirp, &fsb1) != 0 || bcmp(&fsb1.f_fsid,
1855                             &fsb->f_fsid, sizeof(fsb1.f_fsid)) != 0) {
1856                                 *cp = savedc;
1857                                 syslog(LOG_ERR, "can't export %s", dirp);
1858                                 return (1);
1859                         }
1860                 }
1861 skip:
1862                 if (ai != NULL)
1863                         ai = ai->ai_next;
1864                 if (ai == NULL)
1865                         done = TRUE;
1866         }
1867         if (cp)
1868                 *cp = savedc;
1869         return (0);
1870 }
1871
1872 /*
1873  * Translate a net address.
1874  */
1875 int
1876 get_net(char *cp, struct netmsk *net, int maskflg)
1877 {
1878         struct netent *np;
1879         char *name, *p, *prefp;
1880         struct sockaddr_in sin, *sinp;
1881         struct sockaddr *sa;
1882         struct addrinfo hints, *ai = NULL;
1883         char netname[NI_MAXHOST];
1884         long preflen;
1885         int ecode;
1886
1887         p = prefp = NULL;
1888         if ((opt_flags & OP_MASKLEN) && !maskflg) {
1889                 p = strchr(cp, '/');
1890                 *p = '\0';
1891                 prefp = p + 1;
1892         }
1893
1894         if ((np = getnetbyname(cp)) != NULL) {
1895                 sin.sin_family = AF_INET;
1896                 sin.sin_len = sizeof sin;
1897                 sin.sin_addr = inet_makeaddr(np->n_net, 0);
1898                 sa = (struct sockaddr *)&sin;
1899         } else if (isdigit(*cp)) {
1900                 memset(&hints, 0, sizeof hints);
1901                 hints.ai_family = AF_UNSPEC;
1902                 hints.ai_flags = AI_NUMERICHOST;
1903                 if (getaddrinfo(cp, NULL, &hints, &ai) != 0) {
1904                         /*
1905                          * If getaddrinfo() failed, try the inet4 network
1906                          * notation with less than 3 dots.
1907                          */
1908                         sin.sin_family = AF_INET;
1909                         sin.sin_len = sizeof sin;
1910                         sin.sin_addr = inet_makeaddr(inet_network(cp),0);
1911                         if (debug)
1912                                 fprintf(stderr, "get_net: v4 addr %x\n",
1913                                     sin.sin_addr.s_addr);
1914                         sa = (struct sockaddr *)&sin;
1915                 } else
1916                         sa = ai->ai_addr;
1917         } else if (isxdigit(*cp) || *cp == ':') {
1918                 memset(&hints, 0, sizeof hints);
1919                 hints.ai_family = AF_UNSPEC;
1920                 hints.ai_flags = AI_NUMERICHOST;
1921                 if (getaddrinfo(cp, NULL, &hints, &ai) == 0)
1922                         sa = ai->ai_addr;
1923                 else
1924                         goto fail;
1925         } else
1926                 goto fail;
1927
1928         ecode = getnameinfo(sa, sa->sa_len, netname, sizeof netname,
1929             NULL, 0, ninumeric);
1930         if (ecode != 0)
1931                 goto fail;
1932
1933         if (maskflg)
1934                 net->nt_mask = countones(sa);
1935         else {
1936                 if (opt_flags & OP_MASKLEN) {
1937                         preflen = strtol(prefp, NULL, 10);
1938                         if (preflen == LONG_MIN && errno == ERANGE)
1939                                 goto fail;
1940                         net->nt_mask = (int)preflen;
1941                         *p = '/';
1942                 }
1943
1944                 if (np)
1945                         name = np->n_name;
1946                 else {
1947                         if (getnameinfo(sa, sa->sa_len, netname, sizeof netname,
1948                            NULL, 0, ninumeric) != 0)
1949                                 strlcpy(netname, "?", sizeof(netname));
1950                         name = netname;
1951                 }
1952                 net->nt_name = strdup(name);
1953                 memcpy(&net->nt_net, sa, sa->sa_len);
1954         }
1955
1956         if (!maskflg && sa->sa_family == AF_INET &&
1957             !(opt_flags & (OP_MASK|OP_MASKLEN))) {
1958                 sinp = (struct sockaddr_in *)sa;
1959                 if (IN_CLASSA(sinp->sin_addr.s_addr))
1960                         net->nt_mask = 8;
1961                 else if (IN_CLASSB(sinp->sin_addr.s_addr))
1962                         net->nt_mask = 16;
1963                 else if (IN_CLASSC(sinp->sin_addr.s_addr))
1964                         net->nt_mask = 24;
1965                 else if (IN_CLASSD(sinp->sin_addr.s_addr))
1966                         net->nt_mask = 28;
1967                 else
1968                         net->nt_mask = 32;       /* XXX */
1969         }
1970
1971         if (ai)
1972                 freeaddrinfo(ai);
1973         return 0;
1974
1975 fail:
1976         if (ai)
1977                 freeaddrinfo(ai);
1978         return 1;
1979 }
1980
1981 /*
1982  * Parse out the next white space separated field
1983  */
1984 void
1985 nextfield(char **cp, char **endcp)
1986 {
1987         char *p;
1988
1989         p = *cp;
1990         while (*p == ' ' || *p == '\t')
1991                 p++;
1992         if (*p == '\n' || *p == '\0')
1993                 *cp = *endcp = p;
1994         else {
1995                 *cp = p++;
1996                 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
1997                         p++;
1998                 *endcp = p;
1999         }
2000 }
2001
2002 /*
2003  * Get an exports file line. Skip over blank lines and handle line
2004  * continuations.
2005  */
2006 int
2007 get_line(void)
2008 {
2009         char *p, *cp;
2010         int len;
2011         int totlen, cont_line;
2012
2013         /*
2014          * Loop around ignoring blank lines and getting all continuation lines.
2015          */
2016         p = line;
2017         totlen = 0;
2018         do {
2019                 if (fgets(p, LINESIZ - totlen, exp_file) == NULL)
2020                         return (0);
2021                 len = strlen(p);
2022                 cp = p + len - 1;
2023                 cont_line = 0;
2024                 while (cp >= p &&
2025                     (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) {
2026                         if (*cp == '\\')
2027                                 cont_line = 1;
2028                         cp--;
2029                         len--;
2030                 }
2031                 if (cont_line) {
2032                         *++cp = ' ';
2033                         len++;
2034                 }
2035                 *++cp = '\0';
2036                 if (len > 0) {
2037                         totlen += len;
2038                         if (totlen >= LINESIZ) {
2039                                 syslog(LOG_ERR, "exports line too long");
2040                                 exit(2);
2041                         }
2042                         p = cp;
2043                 }
2044         } while (totlen == 0 || cont_line);
2045         return (1);
2046 }
2047
2048 /*
2049  * Parse a description of a credential.
2050  */
2051 void
2052 parsecred(char *namelist, struct ucred *cr)
2053 {
2054         char *name;
2055         int cnt;
2056         char *names;
2057         struct passwd *pw;
2058         struct group *gr;
2059         int ngroups, groups[NGROUPS + 1];
2060
2061         /*
2062          * Set up the unprivileged user.
2063          */
2064         cr->cr_ref = 1;
2065         cr->cr_uid = -2;
2066         cr->cr_groups[0] = -2;
2067         cr->cr_ngroups = 1;
2068         /*
2069          * Get the user's password table entry.
2070          */
2071         names = strsep(&namelist, " \t\n");
2072         name = strsep(&names, ":");
2073         if (isdigit(*name) || *name == '-')
2074                 pw = getpwuid(atoi(name));
2075         else
2076                 pw = getpwnam(name);
2077         /*
2078          * Credentials specified as those of a user.
2079          */
2080         if (names == NULL) {
2081                 if (pw == NULL) {
2082                         syslog(LOG_ERR, "unknown user: %s", name);
2083                         return;
2084                 }
2085                 cr->cr_uid = pw->pw_uid;
2086                 ngroups = NGROUPS + 1;
2087                 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups))
2088                         syslog(LOG_ERR, "too many groups");
2089                 /*
2090                  * Convert from int's to gid_t's and compress out duplicate
2091                  */
2092                 cr->cr_ngroups = ngroups - 1;
2093                 cr->cr_groups[0] = groups[0];
2094                 for (cnt = 2; cnt < ngroups; cnt++)
2095                         cr->cr_groups[cnt - 1] = groups[cnt];
2096                 return;
2097         }
2098         /*
2099          * Explicit credential specified as a colon separated list:
2100          *      uid:gid:gid:...
2101          */
2102         if (pw != NULL)
2103                 cr->cr_uid = pw->pw_uid;
2104         else if (isdigit(*name) || *name == '-')
2105                 cr->cr_uid = atoi(name);
2106         else {
2107                 syslog(LOG_ERR, "unknown user: %s", name);
2108                 return;
2109         }
2110         cr->cr_ngroups = 0;
2111         while (names != NULL && *names != '\0' && cr->cr_ngroups < NGROUPS) {
2112                 name = strsep(&names, ":");
2113                 if (isdigit(*name) || *name == '-') {
2114                         cr->cr_groups[cr->cr_ngroups++] = atoi(name);
2115                 } else {
2116                         if ((gr = getgrnam(name)) == NULL) {
2117                                 syslog(LOG_ERR, "unknown group: %s", name);
2118                                 continue;
2119                         }
2120                         cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid;
2121                 }
2122         }
2123         if (names != NULL && *names != '\0' && cr->cr_ngroups == NGROUPS)
2124                 syslog(LOG_ERR, "too many groups");
2125 }
2126
2127 #define STRSIZ  (RPCMNT_NAMELEN+RPCMNT_PATHLEN+50)
2128 /*
2129  * Routines that maintain the remote mounttab
2130  */
2131 void
2132 get_mountlist(void)
2133 {
2134         struct mountlist *mlp, **mlpp;
2135         char *host, *dirp, *cp;
2136         char str[STRSIZ];
2137         FILE *mlfile;
2138
2139         if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) {
2140                 if (errno == ENOENT)
2141                         return;
2142                 else {
2143                         syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST);
2144                         return;
2145                 }
2146         }
2147         mlpp = &mlhead;
2148         while (fgets(str, STRSIZ, mlfile) != NULL) {
2149                 cp = str;
2150                 host = strsep(&cp, " \t\n");
2151                 dirp = strsep(&cp, " \t\n");
2152                 if (host == NULL || dirp == NULL)
2153                         continue;
2154                 mlp = (struct mountlist *)malloc(sizeof (*mlp));
2155                 if (mlp == NULL)
2156                         out_of_mem();
2157                 strncpy(mlp->ml_host, host, RPCMNT_NAMELEN);
2158                 mlp->ml_host[RPCMNT_NAMELEN] = '\0';
2159                 strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN);
2160                 mlp->ml_dirp[RPCMNT_PATHLEN] = '\0';
2161                 mlp->ml_next = NULL;
2162                 *mlpp = mlp;
2163                 mlpp = &mlp->ml_next;
2164         }
2165         fclose(mlfile);
2166 }
2167
2168 void
2169 del_mlist(char *hostp, char *dirp)
2170 {
2171         struct mountlist *mlp, **mlpp;
2172         struct mountlist *mlp2;
2173         FILE *mlfile;
2174         int fnd = 0;
2175
2176         mlpp = &mlhead;
2177         mlp = mlhead;
2178         while (mlp) {
2179                 if (!strcmp(mlp->ml_host, hostp) &&
2180                     (!dirp || !strcmp(mlp->ml_dirp, dirp))) {
2181                         fnd = 1;
2182                         mlp2 = mlp;
2183                         *mlpp = mlp = mlp->ml_next;
2184                         free((caddr_t)mlp2);
2185                 } else {
2186                         mlpp = &mlp->ml_next;
2187                         mlp = mlp->ml_next;
2188                 }
2189         }
2190         if (fnd) {
2191                 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) {
2192                         syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST);
2193                         return;
2194                 }
2195                 mlp = mlhead;
2196                 while (mlp) {
2197                         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
2198                         mlp = mlp->ml_next;
2199                 }
2200                 fclose(mlfile);
2201         }
2202 }
2203
2204 void
2205 add_mlist(char *hostp, char *dirp)
2206 {
2207         struct mountlist *mlp, **mlpp;
2208         FILE *mlfile;
2209
2210         mlpp = &mlhead;
2211         mlp = mlhead;
2212         while (mlp) {
2213                 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp))
2214                         return;
2215                 mlpp = &mlp->ml_next;
2216                 mlp = mlp->ml_next;
2217         }
2218         mlp = (struct mountlist *)malloc(sizeof (*mlp));
2219         if (mlp == NULL)
2220                 out_of_mem();
2221         strncpy(mlp->ml_host, hostp, RPCMNT_NAMELEN);
2222         mlp->ml_host[RPCMNT_NAMELEN] = '\0';
2223         strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN);
2224         mlp->ml_dirp[RPCMNT_PATHLEN] = '\0';
2225         mlp->ml_next = NULL;
2226         *mlpp = mlp;
2227         if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
2228                 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST);
2229                 return;
2230         }
2231         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
2232         fclose(mlfile);
2233 }
2234
2235 /*
2236  * Free up a group list.
2237  */
2238 void
2239 free_grp(struct grouplist *grp)
2240 {
2241         if (grp->gr_type == GT_HOST) {
2242                 if (grp->gr_ptr.gt_addrinfo != NULL)
2243                         freeaddrinfo(grp->gr_ptr.gt_addrinfo);
2244         } else if (grp->gr_type == GT_NET) {
2245                 if (grp->gr_ptr.gt_net.nt_name)
2246                         free(grp->gr_ptr.gt_net.nt_name);
2247         }
2248         free((caddr_t)grp);
2249 }
2250
2251 #ifdef DEBUG
2252 void
2253 SYSLOG(int pri, const char *fmt, ...)
2254 {
2255         va_list ap;
2256
2257         va_start(ap, fmt);
2258         vfprintf(stderr, fmt, ap);
2259         va_end(ap);
2260 }
2261 #endif /* DEBUG */
2262
2263 /*
2264  * Check options for consistency.
2265  */
2266 int
2267 check_options(struct dirlist *dp)
2268 {
2269
2270         if (dp == NULL)
2271             return (1);
2272         if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL) ||
2273             (opt_flags & (OP_MAPROOT | OP_KERB)) == (OP_MAPROOT | OP_KERB) ||
2274             (opt_flags & (OP_MAPALL | OP_KERB)) == (OP_MAPALL | OP_KERB)) {
2275             syslog(LOG_ERR, "-mapall, -maproot and -kerb mutually exclusive");
2276             return (1);
2277         }
2278         if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) {
2279                 syslog(LOG_ERR, "-mask requires -network");
2280                 return (1);
2281         }
2282         if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
2283             syslog(LOG_ERR, "-alldirs has multiple directories");
2284             return (1);
2285         }
2286         return (0);
2287 }
2288
2289 /*
2290  * Check an absolute directory path for any symbolic links. Return true
2291  */
2292 int
2293 check_dirpath(char *dirp)
2294 {
2295         char *cp;
2296         int ret = 1;
2297         struct stat sb;
2298
2299         cp = dirp + 1;
2300         while (*cp && ret) {
2301                 if (*cp == '/') {
2302                         *cp = '\0';
2303                         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
2304                                 ret = 0;
2305                         *cp = '/';
2306                 }
2307                 cp++;
2308         }
2309         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
2310                 ret = 0;
2311         return (ret);
2312 }
2313
2314 static int
2315 netpartcmp(struct sockaddr *s1, struct sockaddr *s2, int bitlen)
2316 {
2317         void *src, *dst;
2318
2319         if (s1->sa_family != s2->sa_family)
2320                 return 1;
2321
2322         switch (s1->sa_family) {
2323         case AF_INET:
2324                 src = &((struct sockaddr_in *)s1)->sin_addr;
2325                 dst = &((struct sockaddr_in *)s2)->sin_addr;
2326                 if (bitlen > sizeof(((struct sockaddr_in *)s1)->sin_addr) * 8)
2327                         return 1;
2328                 break;
2329         case AF_INET6:
2330                 src = &((struct sockaddr_in6 *)s1)->sin6_addr;
2331                 dst = &((struct sockaddr_in6 *)s2)->sin6_addr;
2332                 if (((struct sockaddr_in6 *)s1)->sin6_scope_id !=
2333                    ((struct sockaddr_in6 *)s2)->sin6_scope_id)
2334                         return 1;
2335                 if (bitlen > sizeof(((struct sockaddr_in6 *)s1)->sin6_addr) * 8)
2336                         return 1;
2337                 break;
2338         default:
2339                 return 1;
2340         }
2341
2342         return bitcmp(src, dst, bitlen);
2343 }
2344
2345 static int
2346 allones(struct sockaddr_storage *ssp, int bitlen)
2347 {
2348         u_int8_t *p;
2349         int bytelen, bitsleft, i;
2350         int zerolen;
2351
2352         switch (ssp->ss_family) {
2353         case AF_INET:
2354                 p = (u_int8_t *)&((struct sockaddr_in *)ssp)->sin_addr;
2355                 zerolen = sizeof (((struct sockaddr_in *)ssp)->sin_addr);
2356                 break;
2357         case AF_INET6:
2358                 p = (u_int8_t *)&((struct sockaddr_in6 *)ssp)->sin6_addr;
2359                 zerolen = sizeof (((struct sockaddr_in6 *)ssp)->sin6_addr);
2360         break;
2361         default:
2362                 return -1;
2363         }
2364
2365         memset(p, 0, zerolen);
2366
2367         bytelen = bitlen / 8;
2368         bitsleft = bitlen % 8;
2369
2370         if (bytelen > zerolen)
2371                 return -1;
2372
2373         for (i = 0; i < bytelen; i++)
2374                 *p++ = 0xff;
2375
2376         for (i = 0; i < bitsleft; i++)
2377                 *p |= 1 << (7 - i);
2378
2379         return 0;
2380 }
2381
2382 static int
2383 countones(struct sockaddr *sa)
2384 {
2385         void *mask;
2386         int i, bits = 0, bytelen;
2387         u_int8_t *p;
2388
2389         switch (sa->sa_family) {
2390         case AF_INET:
2391                 mask = (u_int8_t *)&((struct sockaddr_in *)sa)->sin_addr;
2392                 bytelen = 4;
2393                 break;
2394         case AF_INET6:
2395                 mask = (u_int8_t *)&((struct sockaddr_in6 *)sa)->sin6_addr;
2396                 bytelen = 16;
2397                 break;
2398         default:
2399                 return 0;
2400         }
2401
2402         p = mask;
2403
2404         for (i = 0; i < bytelen; i++, p++) {
2405                 if (*p != 0xff) {
2406                         for (bits = 0; bits < 8; bits++) {
2407                                 if (!(*p & (1 << (7 - bits))))
2408                                         break;
2409                         }
2410                         break;
2411                 }
2412         }
2413
2414         return (i * 8 + bits);
2415 }
2416
2417 static int
2418 sacmp(struct sockaddr *sa1, struct sockaddr *sa2)
2419 {
2420         void *p1, *p2;
2421         int len;
2422
2423         if (sa1->sa_family != sa2->sa_family)
2424                 return 1;
2425
2426         switch (sa1->sa_family) {
2427         case AF_INET:
2428                 p1 = &((struct sockaddr_in *)sa1)->sin_addr;
2429                 p2 = &((struct sockaddr_in *)sa2)->sin_addr;
2430                 len = 4;
2431                 break;
2432         case AF_INET6:
2433                 p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr;
2434                 p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr;
2435                 len = 16;
2436                 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
2437                     ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
2438                         return 1;
2439                 break;
2440         default:
2441                 return 1;
2442         }
2443
2444         return memcmp(p1, p2, len);
2445 }
2446
2447 void
2448 huphandler(int sig)
2449 {
2450         got_sighup = 1;
2451 }
2452
2453 void terminate(sig)
2454 int sig;
2455 {
2456         close(mountdlockfd);
2457         unlink(MOUNTDLOCK);
2458         rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL);
2459         rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL);
2460         exit (0);
2461 }