mountd.c revision 1558 
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
37#ifndef lint
38static char copyright[] =
39"@(#) Copyright (c) 1989, 1993\n\
40	The Regents of the University of California.  All rights reserved.\n";
41#endif not lint
42
43#ifndef lint
44static char sccsid[] = "@(#)mountd.c	8.8 (Berkeley) 2/20/94";
45#endif not lint
46
47#include <sys/param.h>
48#include <sys/file.h>
49#include <sys/ioctl.h>
50#include <sys/mount.h>
51#include <sys/socket.h>
52#include <sys/stat.h>
53#include <sys/syslog.h>
54#include <sys/ucred.h>
55
56#include <rpc/rpc.h>
57#include <rpc/pmap_clnt.h>
58#include <rpc/pmap_prot.h>
59#ifdef ISO
60#include <netiso/iso.h>
61#endif
62#include <nfs/rpcv2.h>
63#include <nfs/nfsv2.h>
64
65#include <arpa/inet.h>
66
67#include <ctype.h>
68#include <errno.h>
69#include <grp.h>
70#include <netdb.h>
71#include <pwd.h>
72#include <signal.h>
73#include <stdio.h>
74#include <stdlib.h>
75#include <string.h>
76#include <unistd.h>
77#include "pathnames.h"
78
79#ifdef DEBUG
80#include <stdarg.h>
81#endif
82
83/*
84 * Structures for keeping the mount list and export list
85 */
86struct mountlist {
87	struct mountlist *ml_next;
88	char	ml_host[RPCMNT_NAMELEN+1];
89	char	ml_dirp[RPCMNT_PATHLEN+1];
90};
91
92struct dirlist {
93	struct dirlist	*dp_left;
94	struct dirlist	*dp_right;
95	int		dp_flag;
96	struct hostlist	*dp_hosts;	/* List of hosts this dir exported to */
97	char		dp_dirp[1];	/* Actually malloc'd to size of dir */
98};
99/* dp_flag bits */
100#define	DP_DEFSET	0x1
101
102struct exportlist {
103	struct exportlist *ex_next;
104	struct dirlist	*ex_dirl;
105	struct dirlist	*ex_defdir;
106	int		ex_flag;
107	fsid_t		ex_fs;
108	char		*ex_fsdir;
109};
110/* ex_flag bits */
111#define	EX_LINKED	0x1
112
113struct netmsk {
114	u_long	nt_net;
115	u_long	nt_mask;
116	char *nt_name;
117};
118
119union grouptypes {
120	struct hostent *gt_hostent;
121	struct netmsk	gt_net;
122#ifdef ISO
123	struct sockaddr_iso *gt_isoaddr;
124#endif
125};
126
127struct grouplist {
128	int gr_type;
129	union grouptypes gr_ptr;
130	struct grouplist *gr_next;
131};
132/* Group types */
133#define	GT_NULL		0x0
134#define	GT_HOST		0x1
135#define	GT_NET		0x2
136#define	GT_ISO		0x4
137
138struct hostlist {
139	struct grouplist *ht_grp;
140	struct hostlist	 *ht_next;
141};
142
143/* Global defs */
144char	*add_expdir __P((struct dirlist **, char *, int));
145void	add_dlist __P((struct dirlist **, struct dirlist *,
146				struct grouplist *));
147void	add_mlist __P((char *, char *));
148int	check_dirpath __P((char *));
149int	check_options __P((struct dirlist *));
150int	chk_host __P((struct dirlist *, u_long, int *));
151void	del_mlist __P((char *, char *));
152struct dirlist *dirp_search __P((struct dirlist *, char *));
153int	do_mount __P((struct exportlist *, struct grouplist *, int,
154				struct ucred *, char *, int, struct statfs *));
155int	do_opt __P((char **, char **, struct exportlist *, struct grouplist *,
156				int *, int *, struct ucred *));
157struct	exportlist *ex_search __P((fsid_t *));
158struct	exportlist *get_exp __P((void));
159void	free_dir __P((struct dirlist *));
160void	free_exp __P((struct exportlist *));
161void	free_grp __P((struct grouplist *));
162void	free_host __P((struct hostlist *));
163void	get_exportlist __P((void));
164int	get_host __P((char *, struct grouplist *));
165struct hostlist *get_ht __P((void));
166int	get_line __P((void));
167void	get_mountlist __P((void));
168int	get_net __P((char *, struct netmsk *, int));
169void	getexp_err __P((struct exportlist *, struct grouplist *));
170struct grouplist *get_grp __P((void));
171void	hang_dirp __P((struct dirlist *, struct grouplist *,
172				struct exportlist *, int));
173void	mntsrv __P((struct svc_req *, SVCXPRT *));
174void	nextfield __P((char **, char **));
175void	out_of_mem __P((void));
176void	parsecred __P((char *, struct ucred *));
177int	put_exlist __P((struct dirlist *, XDR *, struct dirlist *, int *));
178int	scan_tree __P((struct dirlist *, u_long));
179void	send_umntall __P((void));
180int	umntall_each __P((caddr_t, struct sockaddr_in *));
181int	xdr_dir __P((XDR *, char *));
182int	xdr_explist __P((XDR *, caddr_t));
183int	xdr_fhs __P((XDR *, nfsv2fh_t *));
184int	xdr_mlist __P((XDR *, caddr_t));
185
186/* C library */
187int	getnetgrent();
188void	endnetgrent();
189void	setnetgrent();
190
191#ifdef ISO
192struct iso_addr *iso_addr();
193#endif
194
195struct exportlist *exphead;
196struct mountlist *mlhead;
197struct grouplist *grphead;
198char exname[MAXPATHLEN];
199struct ucred def_anon = {
200	1,
201	(uid_t) -2,
202	1,
203	{ (gid_t) -2 }
204};
205int root_only = 1;
206int opt_flags;
207/* Bits for above */
208#define	OP_MAPROOT	0x01
209#define	OP_MAPALL	0x02
210#define	OP_KERB		0x04
211#define	OP_MASK		0x08
212#define	OP_NET		0x10
213#define	OP_ISO		0x20
214#define	OP_ALLDIRS	0x40
215
216#ifdef DEBUG
217int debug = 1;
218void	SYSLOG __P((int, const char *, ...));
219#define syslog SYSLOG
220#else
221int debug = 0;
222#endif
223
224/*
225 * Mountd server for NFS mount protocol as described in:
226 * NFS: Network File System Protocol Specification, RFC1094, Appendix A
227 * The optional arguments are the exports file name
228 * default: _PATH_EXPORTS
229 * and "-n" to allow nonroot mount.
230 */
231int
232main(argc, argv)
233	int argc;
234	char **argv;
235{
236	SVCXPRT *transp;
237	int c;
238
239	while ((c = getopt(argc, argv, "n")) != EOF)
240		switch (c) {
241		case 'n':
242			root_only = 0;
243			break;
244		default:
245			fprintf(stderr, "Usage: mountd [-n] [export_file]\n");
246			exit(1);
247		};
248	argc -= optind;
249	argv += optind;
250	grphead = (struct grouplist *)NULL;
251	exphead = (struct exportlist *)NULL;
252	mlhead = (struct mountlist *)NULL;
253	if (argc == 1) {
254		strncpy(exname, *argv, MAXPATHLEN-1);
255		exname[MAXPATHLEN-1] = '\0';
256	} else
257		strcpy(exname, _PATH_EXPORTS);
258	openlog("mountd", LOG_PID, LOG_DAEMON);
259	if (debug)
260		fprintf(stderr,"Getting export list.\n");
261	get_exportlist();
262	if (debug)
263		fprintf(stderr,"Getting mount list.\n");
264	get_mountlist();
265	if (debug)
266		fprintf(stderr,"Here we go.\n");
267	if (debug == 0) {
268		daemon(0, 0);
269		signal(SIGINT, SIG_IGN);
270		signal(SIGQUIT, SIG_IGN);
271	}
272	signal(SIGHUP, (void (*) __P((int))) get_exportlist);
273	signal(SIGTERM, (void (*) __P((int))) send_umntall);
274	{ FILE *pidfile = fopen(_PATH_MOUNTDPID, "w");
275	  if (pidfile != NULL) {
276		fprintf(pidfile, "%d\n", getpid());
277		fclose(pidfile);
278	  }
279	}
280	if ((transp = svcudp_create(RPC_ANYSOCK)) == NULL) {
281		syslog(LOG_ERR, "Can't create socket");
282		exit(1);
283	}
284	pmap_unset(RPCPROG_MNT, RPCMNT_VER1);
285	if (!svc_register(transp, RPCPROG_MNT, RPCMNT_VER1, mntsrv,
286	    IPPROTO_UDP)) {
287		syslog(LOG_ERR, "Can't register mount");
288		exit(1);
289	}
290	svc_run();
291	syslog(LOG_ERR, "Mountd died");
292	exit(1);
293}
294
295/*
296 * The mount rpc service
297 */
298void
299mntsrv(rqstp, transp)
300	struct svc_req *rqstp;
301	SVCXPRT *transp;
302{
303	struct exportlist *ep;
304	struct dirlist *dp;
305	nfsv2fh_t nfh;
306	struct authunix_parms *ucr;
307	struct stat stb;
308	struct statfs fsb;
309	struct hostent *hp;
310	u_long saddr;
311	char rpcpath[RPCMNT_PATHLEN+1], dirpath[MAXPATHLEN];
312	int bad = ENOENT, omask, defset;
313	uid_t uid = -2;
314
315	/* Get authorization */
316	switch (rqstp->rq_cred.oa_flavor) {
317	case AUTH_UNIX:
318		ucr = (struct authunix_parms *)rqstp->rq_clntcred;
319		uid = ucr->aup_uid;
320		break;
321	case AUTH_NULL:
322	default:
323		break;
324	}
325
326	saddr = transp->xp_raddr.sin_addr.s_addr;
327	hp = (struct hostent *)NULL;
328	switch (rqstp->rq_proc) {
329	case NULLPROC:
330		if (!svc_sendreply(transp, xdr_void, (caddr_t)NULL))
331			syslog(LOG_ERR, "Can't send reply");
332		return;
333	case RPCMNT_MOUNT:
334		if ((uid != 0 && root_only) || uid == -2) {
335			svcerr_weakauth(transp);
336			return;
337		}
338		if (!svc_getargs(transp, xdr_dir, rpcpath)) {
339			svcerr_decode(transp);
340			return;
341		}
342
343		/*
344		 * Get the real pathname and make sure it is a directory
345		 * that exists.
346		 */
347		if (realpath(rpcpath, dirpath) == 0 ||
348		    stat(dirpath, &stb) < 0 ||
349		    (stb.st_mode & S_IFMT) != S_IFDIR ||
350		    statfs(dirpath, &fsb) < 0) {
351			chdir("/");	/* Just in case realpath doesn't */
352			if (debug)
353				fprintf(stderr, "stat failed on %s\n", dirpath);
354			if (!svc_sendreply(transp, xdr_long, (caddr_t)&bad))
355				syslog(LOG_ERR, "Can't send reply");
356			return;
357		}
358
359		/* Check in the exports list */
360		omask = sigblock(sigmask(SIGHUP));
361		ep = ex_search(&fsb.f_fsid);
362		defset = 0;
363		if (ep && (chk_host(ep->ex_defdir, saddr, &defset) ||
364		    ((dp = dirp_search(ep->ex_dirl, dirpath)) &&
365		     chk_host(dp, saddr, &defset)) ||
366		     (defset && scan_tree(ep->ex_defdir, saddr) == 0 &&
367		      scan_tree(ep->ex_dirl, saddr) == 0))) {
368			/* Get the file handle */
369			bzero((caddr_t)&nfh, sizeof(nfh));
370			if (getfh(dirpath, (fhandle_t *)&nfh) < 0) {
371				bad = errno;
372				syslog(LOG_ERR, "Can't get fh for %s", dirpath);
373				if (!svc_sendreply(transp, xdr_long,
374				    (caddr_t)&bad))
375					syslog(LOG_ERR, "Can't send reply");
376				sigsetmask(omask);
377				return;
378			}
379			if (!svc_sendreply(transp, xdr_fhs, (caddr_t)&nfh))
380				syslog(LOG_ERR, "Can't send reply");
381			if (hp == NULL)
382				hp = gethostbyaddr((caddr_t)&saddr,
383				    sizeof(saddr), AF_INET);
384			if (hp)
385				add_mlist(hp->h_name, dirpath);
386			else
387				add_mlist(inet_ntoa(transp->xp_raddr.sin_addr),
388					dirpath);
389			if (debug)
390				fprintf(stderr,"Mount successfull.\n");
391		} else {
392			bad = EACCES;
393			if (!svc_sendreply(transp, xdr_long, (caddr_t)&bad))
394				syslog(LOG_ERR, "Can't send reply");
395		}
396		sigsetmask(omask);
397		return;
398	case RPCMNT_DUMP:
399		if (!svc_sendreply(transp, xdr_mlist, (caddr_t)NULL))
400			syslog(LOG_ERR, "Can't send reply");
401		return;
402	case RPCMNT_UMOUNT:
403		if ((uid != 0 && root_only) || uid == -2) {
404			svcerr_weakauth(transp);
405			return;
406		}
407		if (!svc_getargs(transp, xdr_dir, dirpath)) {
408			svcerr_decode(transp);
409			return;
410		}
411		if (!svc_sendreply(transp, xdr_void, (caddr_t)NULL))
412			syslog(LOG_ERR, "Can't send reply");
413		hp = gethostbyaddr((caddr_t)&saddr, sizeof(saddr), AF_INET);
414		if (hp)
415			del_mlist(hp->h_name, dirpath);
416		del_mlist(inet_ntoa(transp->xp_raddr.sin_addr), dirpath);
417		return;
418	case RPCMNT_UMNTALL:
419		if ((uid != 0 && root_only) || uid == -2) {
420			svcerr_weakauth(transp);
421			return;
422		}
423		if (!svc_sendreply(transp, xdr_void, (caddr_t)NULL))
424			syslog(LOG_ERR, "Can't send reply");
425		hp = gethostbyaddr((caddr_t)&saddr, sizeof(saddr), AF_INET);
426		if (hp)
427			del_mlist(hp->h_name, (char *)NULL);
428		del_mlist(inet_ntoa(transp->xp_raddr.sin_addr), (char *)NULL);
429		return;
430	case RPCMNT_EXPORT:
431		if (!svc_sendreply(transp, xdr_explist, (caddr_t)NULL))
432			syslog(LOG_ERR, "Can't send reply");
433		return;
434	default:
435		svcerr_noproc(transp);
436		return;
437	}
438}
439
440/*
441 * Xdr conversion for a dirpath string
442 */
443int
444xdr_dir(xdrsp, dirp)
445	XDR *xdrsp;
446	char *dirp;
447{
448	return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
449}
450
451/*
452 * Xdr routine to generate fhstatus
453 */
454int
455xdr_fhs(xdrsp, nfh)
456	XDR *xdrsp;
457	nfsv2fh_t *nfh;
458{
459	int ok = 0;
460
461	if (!xdr_long(xdrsp, &ok))
462		return (0);
463	return (xdr_opaque(xdrsp, (caddr_t)nfh, NFSX_FH));
464}
465
466int
467xdr_mlist(xdrsp, cp)
468	XDR *xdrsp;
469	caddr_t cp;
470{
471	struct mountlist *mlp;
472	int true = 1;
473	int false = 0;
474	char *strp;
475
476	mlp = mlhead;
477	while (mlp) {
478		if (!xdr_bool(xdrsp, &true))
479			return (0);
480		strp = &mlp->ml_host[0];
481		if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
482			return (0);
483		strp = &mlp->ml_dirp[0];
484		if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
485			return (0);
486		mlp = mlp->ml_next;
487	}
488	if (!xdr_bool(xdrsp, &false))
489		return (0);
490	return (1);
491}
492
493/*
494 * Xdr conversion for export list
495 */
496int
497xdr_explist(xdrsp, cp)
498	XDR *xdrsp;
499	caddr_t cp;
500{
501	struct exportlist *ep;
502	int false = 0;
503	int omask, putdef;
504
505	omask = sigblock(sigmask(SIGHUP));
506	ep = exphead;
507	while (ep) {
508		putdef = 0;
509		if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir, &putdef))
510			goto errout;
511		if (ep->ex_defdir && putdef == 0 &&
512			put_exlist(ep->ex_defdir, xdrsp, (struct dirlist *)NULL,
513			&putdef))
514			goto errout;
515		ep = ep->ex_next;
516	}
517	sigsetmask(omask);
518	if (!xdr_bool(xdrsp, &false))
519		return (0);
520	return (1);
521errout:
522	sigsetmask(omask);
523	return (0);
524}
525
526/*
527 * Called from xdr_explist() to traverse the tree and export the
528 * directory paths.
529 */
530int
531put_exlist(dp, xdrsp, adp, putdefp)
532	struct dirlist *dp;
533	XDR *xdrsp;
534	struct dirlist *adp;
535	int *putdefp;
536{
537	struct grouplist *grp;
538	struct hostlist *hp;
539	int true = 1;
540	int false = 0;
541	int gotalldir = 0;
542	char *strp;
543
544	if (dp) {
545		if (put_exlist(dp->dp_left, xdrsp, adp, putdefp))
546			return (1);
547		if (!xdr_bool(xdrsp, &true))
548			return (1);
549		strp = dp->dp_dirp;
550		if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
551			return (1);
552		if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) {
553			gotalldir = 1;
554			*putdefp = 1;
555		}
556		if ((dp->dp_flag & DP_DEFSET) == 0 &&
557		    (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) {
558			hp = dp->dp_hosts;
559			while (hp) {
560				grp = hp->ht_grp;
561				if (grp->gr_type == GT_HOST) {
562					if (!xdr_bool(xdrsp, &true))
563						return (1);
564					strp = grp->gr_ptr.gt_hostent->h_name;
565					if (!xdr_string(xdrsp, &strp,
566					    RPCMNT_NAMELEN))
567						return (1);
568				} else if (grp->gr_type == GT_NET) {
569					if (!xdr_bool(xdrsp, &true))
570						return (1);
571					strp = grp->gr_ptr.gt_net.nt_name;
572					if (!xdr_string(xdrsp, &strp,
573					    RPCMNT_NAMELEN))
574						return (1);
575				}
576				hp = hp->ht_next;
577				if (gotalldir && hp == (struct hostlist *)NULL) {
578					hp = adp->dp_hosts;
579					gotalldir = 0;
580				}
581			}
582		}
583		if (!xdr_bool(xdrsp, &false))
584			return (1);
585		if (put_exlist(dp->dp_right, xdrsp, adp, putdefp))
586			return (1);
587	}
588	return (0);
589}
590
591#define LINESIZ	10240
592char line[LINESIZ];
593FILE *exp_file;
594
595/*
596 * Get the export list
597 */
598void
599get_exportlist()
600{
601	struct exportlist *ep, *ep2;
602	struct grouplist *grp, *tgrp;
603	struct exportlist **epp;
604	struct dirlist *dirhead;
605	struct statfs fsb, *fsp;
606	struct hostent *hpe;
607	struct ucred anon;
608	char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc;
609	int len, has_host, exflags, got_nondir, dirplen, num, i, netgrp;
610
611	/*
612	 * First, get rid of the old list
613	 */
614	ep = exphead;
615	while (ep) {
616		ep2 = ep;
617		ep = ep->ex_next;
618		free_exp(ep2);
619	}
620	exphead = (struct exportlist *)NULL;
621
622	grp = grphead;
623	while (grp) {
624		tgrp = grp;
625		grp = grp->gr_next;
626		free_grp(tgrp);
627	}
628	grphead = (struct grouplist *)NULL;
629
630	/*
631	 * And delete exports that are in the kernel for all local
632	 * file systems.
633	 * XXX: Should know how to handle all local exportable file systems
634	 *      instead of just MOUNT_UFS.
635	 */
636	num = getmntinfo(&fsp, MNT_NOWAIT);
637	for (i = 0; i < num; i++) {
638		union {
639			struct ufs_args ua;
640			struct iso_args ia;
641			struct mfs_args ma;
642		} targs;
643
644		switch (fsp->f_type) {
645		case MOUNT_MFS:
646		case MOUNT_UFS:
647		case MOUNT_CD9660:
648			targs.ua.fspec = NULL;
649			targs.ua.export.ex_flags = MNT_DELEXPORT;
650			if (mount(fsp->f_type, fsp->f_mntonname,
651				  fsp->f_flags | MNT_UPDATE,
652				  (caddr_t)&targs) < 0)
653				syslog(LOG_ERR, "Can't delete exports for %s",
654				       fsp->f_mntonname);
655		}
656		fsp++;
657	}
658
659	/*
660	 * Read in the exports file and build the list, calling
661	 * mount() as we go along to push the export rules into the kernel.
662	 */
663	if ((exp_file = fopen(exname, "r")) == NULL) {
664		syslog(LOG_ERR, "Can't open %s", exname);
665		exit(2);
666	}
667	dirhead = (struct dirlist *)NULL;
668	while (get_line()) {
669		if (debug)
670			fprintf(stderr,"Got line %s\n",line);
671		cp = line;
672		nextfield(&cp, &endcp);
673		if (*cp == '#')
674			goto nextline;
675
676		/*
677		 * Set defaults.
678		 */
679		has_host = FALSE;
680		anon = def_anon;
681		exflags = MNT_EXPORTED;
682		got_nondir = 0;
683		opt_flags = 0;
684		ep = (struct exportlist *)NULL;
685
686		/*
687		 * Create new exports list entry
688		 */
689		len = endcp-cp;
690		tgrp = grp = get_grp();
691		while (len > 0) {
692			if (len > RPCMNT_NAMELEN) {
693			    getexp_err(ep, tgrp);
694			    goto nextline;
695			}
696			if (*cp == '-') {
697			    if (ep == (struct exportlist *)NULL) {
698				getexp_err(ep, tgrp);
699				goto nextline;
700			    }
701			    if (debug)
702				fprintf(stderr, "doing opt %s\n", cp);
703			    got_nondir = 1;
704			    if (do_opt(&cp, &endcp, ep, grp, &has_host,
705				&exflags, &anon)) {
706				getexp_err(ep, tgrp);
707				goto nextline;
708			    }
709			} else if (*cp == '/') {
710			    savedc = *endcp;
711			    *endcp = '\0';
712			    if (check_dirpath(cp) &&
713				statfs(cp, &fsb) >= 0) {
714				if (got_nondir) {
715				    syslog(LOG_ERR, "Dirs must be first");
716				    getexp_err(ep, tgrp);
717				    goto nextline;
718				}
719				if (ep) {
720				    if (ep->ex_fs.val[0] != fsb.f_fsid.val[0] ||
721					ep->ex_fs.val[1] != fsb.f_fsid.val[1]) {
722					getexp_err(ep, tgrp);
723					goto nextline;
724				    }
725				} else {
726				    /*
727				     * See if this directory is already
728				     * in the list.
729				     */
730				    ep = ex_search(&fsb.f_fsid);
731				    if (ep == (struct exportlist *)NULL) {
732					ep = get_exp();
733					ep->ex_fs = fsb.f_fsid;
734					ep->ex_fsdir = (char *)
735					    malloc(strlen(fsb.f_mntonname) + 1);
736					if (ep->ex_fsdir)
737					    strcpy(ep->ex_fsdir,
738						fsb.f_mntonname);
739					else
740					    out_of_mem();
741					if (debug)
742					  fprintf(stderr,
743					      "Making new ep fs=0x%x,0x%x\n",
744					      fsb.f_fsid.val[0],
745					      fsb.f_fsid.val[1]);
746				    } else if (debug)
747					fprintf(stderr,
748					    "Found ep fs=0x%x,0x%x\n",
749					    fsb.f_fsid.val[0],
750					    fsb.f_fsid.val[1]);
751				}
752
753				/*
754				 * Add dirpath to export mount point.
755				 */
756				dirp = add_expdir(&dirhead, cp, len);
757				dirplen = len;
758			    } else {
759				getexp_err(ep, tgrp);
760				goto nextline;
761			    }
762			    *endcp = savedc;
763			} else {
764			    savedc = *endcp;
765			    *endcp = '\0';
766			    got_nondir = 1;
767			    if (ep == (struct exportlist *)NULL) {
768				getexp_err(ep, tgrp);
769				goto nextline;
770			    }
771
772			    /*
773			     * Get the host or netgroup.
774			     */
775			    setnetgrent(cp);
776			    netgrp = getnetgrent(&hst, &usr, &dom);
777			    do {
778				if (has_host) {
779				    grp->gr_next = get_grp();
780				    grp = grp->gr_next;
781				}
782				if (netgrp) {
783				    if (get_host(hst, grp)) {
784					syslog(LOG_ERR, "Bad netgroup %s", cp);
785					getexp_err(ep, tgrp);
786					goto nextline;
787				    }
788				} else if (get_host(cp, grp)) {
789				    getexp_err(ep, tgrp);
790				    goto nextline;
791				}
792				has_host = TRUE;
793			    } while (netgrp && getnetgrent(&hst, &usr, &dom));
794			    endnetgrent();
795			    *endcp = savedc;
796			}
797			cp = endcp;
798			nextfield(&cp, &endcp);
799			len = endcp - cp;
800		}
801		if (check_options(dirhead)) {
802			getexp_err(ep, tgrp);
803			goto nextline;
804		}
805		if (!has_host) {
806			grp->gr_type = GT_HOST;
807			if (debug)
808				fprintf(stderr,"Adding a default entry\n");
809			/* add a default group and make the grp list NULL */
810			hpe = (struct hostent *)malloc(sizeof(struct hostent));
811			if (hpe == (struct hostent *)NULL)
812				out_of_mem();
813			hpe->h_name = "Default";
814			hpe->h_addrtype = AF_INET;
815			hpe->h_length = sizeof (u_long);
816			hpe->h_addr_list = (char **)NULL;
817			grp->gr_ptr.gt_hostent = hpe;
818
819		/*
820		 * Don't allow a network export coincide with a list of
821		 * host(s) on the same line.
822		 */
823		} else if ((opt_flags & OP_NET) && tgrp->gr_next) {
824			getexp_err(ep, tgrp);
825			goto nextline;
826		}
827
828		/*
829		 * Loop through hosts, pushing the exports into the kernel.
830		 * After loop, tgrp points to the start of the list and
831		 * grp points to the last entry in the list.
832		 */
833		grp = tgrp;
834		do {
835		    if (do_mount(ep, grp, exflags, &anon, dirp,
836			dirplen, &fsb)) {
837			getexp_err(ep, tgrp);
838			goto nextline;
839		    }
840		} while (grp->gr_next && (grp = grp->gr_next));
841
842		/*
843		 * Success. Update the data structures.
844		 */
845		if (has_host) {
846			hang_dirp(dirhead, tgrp, ep, (opt_flags & OP_ALLDIRS));
847			grp->gr_next = grphead;
848			grphead = tgrp;
849		} else {
850			hang_dirp(dirhead, (struct grouplist *)NULL, ep,
851			(opt_flags & OP_ALLDIRS));
852			free_grp(grp);
853		}
854		dirhead = (struct dirlist *)NULL;
855		if ((ep->ex_flag & EX_LINKED) == 0) {
856			ep2 = exphead;
857			epp = &exphead;
858
859			/*
860			 * Insert in the list in alphabetical order.
861			 */
862			while (ep2 && strcmp(ep2->ex_fsdir, ep->ex_fsdir) < 0) {
863				epp = &ep2->ex_next;
864				ep2 = ep2->ex_next;
865			}
866			if (ep2)
867				ep->ex_next = ep2;
868			*epp = ep;
869			ep->ex_flag |= EX_LINKED;
870		}
871nextline:
872		if (dirhead) {
873			free_dir(dirhead);
874			dirhead = (struct dirlist *)NULL;
875		}
876	}
877	fclose(exp_file);
878}
879
880/*
881 * Allocate an export list element
882 */
883struct exportlist *
884get_exp()
885{
886	struct exportlist *ep;
887
888	ep = (struct exportlist *)malloc(sizeof (struct exportlist));
889	if (ep == (struct exportlist *)NULL)
890		out_of_mem();
891	bzero((caddr_t)ep, sizeof (struct exportlist));
892	return (ep);
893}
894
895/*
896 * Allocate a group list element
897 */
898struct grouplist *
899get_grp()
900{
901	struct grouplist *gp;
902
903	gp = (struct grouplist *)malloc(sizeof (struct grouplist));
904	if (gp == (struct grouplist *)NULL)
905		out_of_mem();
906	bzero((caddr_t)gp, sizeof (struct grouplist));
907	return (gp);
908}
909
910/*
911 * Clean up upon an error in get_exportlist().
912 */
913void
914getexp_err(ep, grp)
915	struct exportlist *ep;
916	struct grouplist *grp;
917{
918	struct grouplist *tgrp;
919
920	syslog(LOG_ERR, "Bad exports list line %s", line);
921	if (ep && (ep->ex_flag & EX_LINKED) == 0)
922		free_exp(ep);
923	while (grp) {
924		tgrp = grp;
925		grp = grp->gr_next;
926		free_grp(tgrp);
927	}
928}
929
930/*
931 * Search the export list for a matching fs.
932 */
933struct exportlist *
934ex_search(fsid)
935	fsid_t *fsid;
936{
937	struct exportlist *ep;
938
939	ep = exphead;
940	while (ep) {
941		if (ep->ex_fs.val[0] == fsid->val[0] &&
942		    ep->ex_fs.val[1] == fsid->val[1])
943			return (ep);
944		ep = ep->ex_next;
945	}
946	return (ep);
947}
948
949/*
950 * Add a directory path to the list.
951 */
952char *
953add_expdir(dpp, cp, len)
954	struct dirlist **dpp;
955	char *cp;
956	int len;
957{
958	struct dirlist *dp;
959
960	dp = (struct dirlist *)malloc(sizeof (struct dirlist) + len);
961	dp->dp_left = *dpp;
962	dp->dp_right = (struct dirlist *)NULL;
963	dp->dp_flag = 0;
964	dp->dp_hosts = (struct hostlist *)NULL;
965	strcpy(dp->dp_dirp, cp);
966	*dpp = dp;
967	return (dp->dp_dirp);
968}
969
970/*
971 * Hang the dir list element off the dirpath binary tree as required
972 * and update the entry for host.
973 */
974void
975hang_dirp(dp, grp, ep, alldirs)
976	struct dirlist *dp;
977	struct grouplist *grp;
978	struct exportlist *ep;
979	int alldirs;
980{
981	struct hostlist *hp;
982	struct dirlist *dp2;
983
984	if (alldirs) {
985		if (ep->ex_defdir)
986			free((caddr_t)dp);
987		else
988			ep->ex_defdir = dp;
989		if (grp == (struct grouplist *)NULL)
990			ep->ex_defdir->dp_flag |= DP_DEFSET;
991		else while (grp) {
992			hp = get_ht();
993			hp->ht_grp = grp;
994			hp->ht_next = ep->ex_defdir->dp_hosts;
995			ep->ex_defdir->dp_hosts = hp;
996			grp = grp->gr_next;
997		}
998	} else {
999
1000		/*
1001		 * Loop throught the directories adding them to the tree.
1002		 */
1003		while (dp) {
1004			dp2 = dp->dp_left;
1005			add_dlist(&ep->ex_dirl, dp, grp);
1006			dp = dp2;
1007		}
1008	}
1009}
1010
1011/*
1012 * Traverse the binary tree either updating a node that is already there
1013 * for the new directory or adding the new node.
1014 */
1015void
1016add_dlist(dpp, newdp, grp)
1017	struct dirlist **dpp;
1018	struct dirlist *newdp;
1019	struct grouplist *grp;
1020{
1021	struct dirlist *dp;
1022	struct hostlist *hp;
1023	int cmp;
1024
1025	dp = *dpp;
1026	if (dp) {
1027		cmp = strcmp(dp->dp_dirp, newdp->dp_dirp);
1028		if (cmp > 0) {
1029			add_dlist(&dp->dp_left, newdp, grp);
1030			return;
1031		} else if (cmp < 0) {
1032			add_dlist(&dp->dp_right, newdp, grp);
1033			return;
1034		} else
1035			free((caddr_t)newdp);
1036	} else {
1037		dp = newdp;
1038		dp->dp_left = (struct dirlist *)NULL;
1039		*dpp = dp;
1040	}
1041	if (grp) {
1042
1043		/*
1044		 * Hang all of the host(s) off of the directory point.
1045		 */
1046		do {
1047			hp = get_ht();
1048			hp->ht_grp = grp;
1049			hp->ht_next = dp->dp_hosts;
1050			dp->dp_hosts = hp;
1051			grp = grp->gr_next;
1052		} while (grp);
1053	} else
1054		dp->dp_flag |= DP_DEFSET;
1055}
1056
1057/*
1058 * Search for a dirpath on the export point.
1059 */
1060struct dirlist *
1061dirp_search(dp, dirpath)
1062	struct dirlist *dp;
1063	char *dirpath;
1064{
1065	int cmp;
1066
1067	if (dp) {
1068		cmp = strcmp(dp->dp_dirp, dirpath);
1069		if (cmp > 0)
1070			return (dirp_search(dp->dp_left, dirpath));
1071		else if (cmp < 0)
1072			return (dirp_search(dp->dp_right, dirpath));
1073		else
1074			return (dp);
1075	}
1076	return (dp);
1077}
1078
1079/*
1080 * Scan for a host match in a directory tree.
1081 */
1082int
1083chk_host(dp, saddr, defsetp)
1084	struct dirlist *dp;
1085	u_long saddr;
1086	int *defsetp;
1087{
1088	struct hostlist *hp;
1089	struct grouplist *grp;
1090	u_long **addrp;
1091
1092	if (dp) {
1093		if (dp->dp_flag & DP_DEFSET)
1094			*defsetp = 1;
1095		hp = dp->dp_hosts;
1096		while (hp) {
1097			grp = hp->ht_grp;
1098			switch (grp->gr_type) {
1099			case GT_HOST:
1100			    addrp = (u_long **)
1101				grp->gr_ptr.gt_hostent->h_addr_list;
1102			    while (*addrp) {
1103				if (**addrp == saddr)
1104				    return (1);
1105				addrp++;
1106			    }
1107			    break;
1108			case GT_NET:
1109			    if ((saddr & grp->gr_ptr.gt_net.nt_mask) ==
1110				grp->gr_ptr.gt_net.nt_net)
1111				return (1);
1112			    break;
1113			};
1114			hp = hp->ht_next;
1115		}
1116	}
1117	return (0);
1118}
1119
1120/*
1121 * Scan tree for a host that matches the address.
1122 */
1123int
1124scan_tree(dp, saddr)
1125	struct dirlist *dp;
1126	u_long saddr;
1127{
1128	int defset;
1129
1130	if (dp) {
1131		if (scan_tree(dp->dp_left, saddr))
1132			return (1);
1133		if (chk_host(dp, saddr, &defset))
1134			return (1);
1135		if (scan_tree(dp->dp_right, saddr))
1136			return (1);
1137	}
1138	return (0);
1139}
1140
1141/*
1142 * Traverse the dirlist tree and free it up.
1143 */
1144void
1145free_dir(dp)
1146	struct dirlist *dp;
1147{
1148
1149	if (dp) {
1150		free_dir(dp->dp_left);
1151		free_dir(dp->dp_right);
1152		free_host(dp->dp_hosts);
1153		free((caddr_t)dp);
1154	}
1155}
1156
1157/*
1158 * Parse the option string and update fields.
1159 * Option arguments may either be -<option>=<value> or
1160 * -<option> <value>
1161 */
1162int
1163do_opt(cpp, endcpp, ep, grp, has_hostp, exflagsp, cr)
1164	char **cpp, **endcpp;
1165	struct exportlist *ep;
1166	struct grouplist *grp;
1167	int *has_hostp;
1168	int *exflagsp;
1169	struct ucred *cr;
1170{
1171	char *cpoptarg, *cpoptend;
1172	char *cp, *endcp, *cpopt, savedc, savedc2;
1173	int allflag, usedarg;
1174
1175	cpopt = *cpp;
1176	cpopt++;
1177	cp = *endcpp;
1178	savedc = *cp;
1179	*cp = '\0';
1180	while (cpopt && *cpopt) {
1181		allflag = 1;
1182		usedarg = -2;
1183		if (cpoptend = index(cpopt, ',')) {
1184			*cpoptend++ = '\0';
1185			if (cpoptarg = index(cpopt, '='))
1186				*cpoptarg++ = '\0';
1187		} else {
1188			if (cpoptarg = index(cpopt, '='))
1189				*cpoptarg++ = '\0';
1190			else {
1191				*cp = savedc;
1192				nextfield(&cp, &endcp);
1193				**endcpp = '\0';
1194				if (endcp > cp && *cp != '-') {
1195					cpoptarg = cp;
1196					savedc2 = *endcp;
1197					*endcp = '\0';
1198					usedarg = 0;
1199				}
1200			}
1201		}
1202		if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) {
1203			*exflagsp |= MNT_EXRDONLY;
1204		} else if (cpoptarg && (!strcmp(cpopt, "maproot") ||
1205		    !(allflag = strcmp(cpopt, "mapall")) ||
1206		    !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) {
1207			usedarg++;
1208			parsecred(cpoptarg, cr);
1209			if (allflag == 0) {
1210				*exflagsp |= MNT_EXPORTANON;
1211				opt_flags |= OP_MAPALL;
1212			} else
1213				opt_flags |= OP_MAPROOT;
1214		} else if (!strcmp(cpopt, "kerb") || !strcmp(cpopt, "k")) {
1215			*exflagsp |= MNT_EXKERB;
1216			opt_flags |= OP_KERB;
1217		} else if (cpoptarg && (!strcmp(cpopt, "mask") ||
1218			!strcmp(cpopt, "m"))) {
1219			if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) {
1220				syslog(LOG_ERR, "Bad mask: %s", cpoptarg);
1221				return (1);
1222			}
1223			usedarg++;
1224			opt_flags |= OP_MASK;
1225		} else if (cpoptarg && (!strcmp(cpopt, "network") ||
1226			!strcmp(cpopt, "n"))) {
1227			if (grp->gr_type != GT_NULL) {
1228				syslog(LOG_ERR, "Network/host conflict");
1229				return (1);
1230			} else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) {
1231				syslog(LOG_ERR, "Bad net: %s", cpoptarg);
1232				return (1);
1233			}
1234			grp->gr_type = GT_NET;
1235			*has_hostp = 1;
1236			usedarg++;
1237			opt_flags |= OP_NET;
1238		} else if (!strcmp(cpopt, "alldirs")) {
1239			opt_flags |= OP_ALLDIRS;
1240#ifdef ISO
1241		} else if (cpoptarg && !strcmp(cpopt, "iso")) {
1242			if (get_isoaddr(cpoptarg, grp)) {
1243				syslog(LOG_ERR, "Bad iso addr: %s", cpoptarg);
1244				return (1);
1245			}
1246			*has_hostp = 1;
1247			usedarg++;
1248			opt_flags |= OP_ISO;
1249#endif /* ISO */
1250		} else {
1251			syslog(LOG_ERR, "Bad opt %s", cpopt);
1252			return (1);
1253		}
1254		if (usedarg >= 0) {
1255			*endcp = savedc2;
1256			**endcpp = savedc;
1257			if (usedarg > 0) {
1258				*cpp = cp;
1259				*endcpp = endcp;
1260			}
1261			return (0);
1262		}
1263		cpopt = cpoptend;
1264	}
1265	**endcpp = savedc;
1266	return (0);
1267}
1268
1269/*
1270 * Translate a character string to the corresponding list of network
1271 * addresses for a hostname.
1272 */
1273int
1274get_host(cp, grp)
1275	char *cp;
1276	struct grouplist *grp;
1277{
1278	struct hostent *hp, *nhp;
1279	char **addrp, **naddrp;
1280	struct hostent t_host;
1281	int i;
1282	u_long saddr;
1283	char *aptr[2];
1284
1285	if (grp->gr_type != GT_NULL)
1286		return (1);
1287	if ((hp = gethostbyname(cp)) == NULL) {
1288		if (isdigit(*cp)) {
1289			saddr = inet_addr(cp);
1290			if (saddr == -1) {
1291				syslog(LOG_ERR, "Inet_addr failed");
1292				return (1);
1293			}
1294			if ((hp = gethostbyaddr((caddr_t)&saddr, sizeof (saddr),
1295				AF_INET)) == NULL) {
1296				hp = &t_host;
1297				hp->h_name = cp;
1298				hp->h_addrtype = AF_INET;
1299				hp->h_length = sizeof (u_long);
1300				hp->h_addr_list = aptr;
1301				aptr[0] = (char *)&saddr;
1302				aptr[1] = (char *)NULL;
1303			}
1304		} else {
1305			syslog(LOG_ERR, "Gethostbyname failed");
1306			return (1);
1307		}
1308	}
1309	grp->gr_type = GT_HOST;
1310	nhp = grp->gr_ptr.gt_hostent = (struct hostent *)
1311		malloc(sizeof(struct hostent));
1312	if (nhp == (struct hostent *)NULL)
1313		out_of_mem();
1314	bcopy((caddr_t)hp, (caddr_t)nhp,
1315		sizeof(struct hostent));
1316	i = strlen(hp->h_name)+1;
1317	nhp->h_name = (char *)malloc(i);
1318	if (nhp->h_name == (char *)NULL)
1319		out_of_mem();
1320	bcopy(hp->h_name, nhp->h_name, i);
1321	addrp = hp->h_addr_list;
1322	i = 1;
1323	while (*addrp++)
1324		i++;
1325	naddrp = nhp->h_addr_list = (char **)
1326		malloc(i*sizeof(char *));
1327	if (naddrp == (char **)NULL)
1328		out_of_mem();
1329	addrp = hp->h_addr_list;
1330	while (*addrp) {
1331		*naddrp = (char *)
1332		    malloc(hp->h_length);
1333		if (*naddrp == (char *)NULL)
1334		    out_of_mem();
1335		bcopy(*addrp, *naddrp,
1336			hp->h_length);
1337		addrp++;
1338		naddrp++;
1339	}
1340	*naddrp = (char *)NULL;
1341	if (debug)
1342		fprintf(stderr, "got host %s\n", hp->h_name);
1343	return (0);
1344}
1345
1346/*
1347 * Free up an exports list component
1348 */
1349void
1350free_exp(ep)
1351	struct exportlist *ep;
1352{
1353
1354	if (ep->ex_defdir) {
1355		free_host(ep->ex_defdir->dp_hosts);
1356		free((caddr_t)ep->ex_defdir);
1357	}
1358	if (ep->ex_fsdir)
1359		free(ep->ex_fsdir);
1360	free_dir(ep->ex_dirl);
1361	free((caddr_t)ep);
1362}
1363
1364/*
1365 * Free hosts.
1366 */
1367void
1368free_host(hp)
1369	struct hostlist *hp;
1370{
1371	struct hostlist *hp2;
1372
1373	while (hp) {
1374		hp2 = hp;
1375		hp = hp->ht_next;
1376		free((caddr_t)hp2);
1377	}
1378}
1379
1380struct hostlist *
1381get_ht()
1382{
1383	struct hostlist *hp;
1384
1385	hp = (struct hostlist *)malloc(sizeof (struct hostlist));
1386	if (hp == (struct hostlist *)NULL)
1387		out_of_mem();
1388	hp->ht_next = (struct hostlist *)NULL;
1389	return (hp);
1390}
1391
1392#ifdef ISO
1393/*
1394 * Translate an iso address.
1395 */
1396get_isoaddr(cp, grp)
1397	char *cp;
1398	struct grouplist *grp;
1399{
1400	struct iso_addr *isop;
1401	struct sockaddr_iso *isoaddr;
1402
1403	if (grp->gr_type != GT_NULL)
1404		return (1);
1405	if ((isop = iso_addr(cp)) == NULL) {
1406		syslog(LOG_ERR,
1407		    "iso_addr failed, ignored");
1408		return (1);
1409	}
1410	isoaddr = (struct sockaddr_iso *)
1411	    malloc(sizeof (struct sockaddr_iso));
1412	if (isoaddr == (struct sockaddr_iso *)NULL)
1413		out_of_mem();
1414	bzero((caddr_t)isoaddr, sizeof (struct sockaddr_iso));
1415	bcopy((caddr_t)isop, (caddr_t)&isoaddr->siso_addr,
1416		sizeof (struct iso_addr));
1417	isoaddr->siso_len = sizeof (struct sockaddr_iso);
1418	isoaddr->siso_family = AF_ISO;
1419	grp->gr_type = GT_ISO;
1420	grp->gr_ptr.gt_isoaddr = isoaddr;
1421	return (0);
1422}
1423#endif	/* ISO */
1424
1425/*
1426 * Out of memory, fatal
1427 */
1428void
1429out_of_mem()
1430{
1431
1432	syslog(LOG_ERR, "Out of memory");
1433	exit(2);
1434}
1435
1436/*
1437 * Do the mount syscall with the update flag to push the export info into
1438 * the kernel.
1439 */
1440int
1441do_mount(ep, grp, exflags, anoncrp, dirp, dirplen, fsb)
1442	struct exportlist *ep;
1443	struct grouplist *grp;
1444	int exflags;
1445	struct ucred *anoncrp;
1446	char *dirp;
1447	int dirplen;
1448	struct statfs *fsb;
1449{
1450	char *cp = (char *)NULL;
1451	u_long **addrp;
1452	int done;
1453	char savedc = '\0';
1454	struct sockaddr_in sin, imask;
1455	union {
1456		struct ufs_args ua;
1457		struct iso_args ia;
1458		struct mfs_args ma;
1459	} args;
1460	u_long net;
1461
1462	args.ua.fspec = 0;
1463	args.ua.export.ex_flags = exflags;
1464	args.ua.export.ex_anon = *anoncrp;
1465	bzero((char *)&sin, sizeof(sin));
1466	bzero((char *)&imask, sizeof(imask));
1467	sin.sin_family = AF_INET;
1468	sin.sin_len = sizeof(sin);
1469	imask.sin_family = AF_INET;
1470	imask.sin_len = sizeof(sin);
1471	if (grp->gr_type == GT_HOST)
1472		addrp = (u_long **)grp->gr_ptr.gt_hostent->h_addr_list;
1473	else
1474		addrp = (u_long **)NULL;
1475	done = FALSE;
1476	while (!done) {
1477		switch (grp->gr_type) {
1478		case GT_HOST:
1479			if (addrp) {
1480				sin.sin_addr.s_addr = **addrp;
1481				args.ua.export.ex_addrlen = sizeof(sin);
1482			} else
1483				args.ua.export.ex_addrlen = 0;
1484			args.ua.export.ex_addr = (struct sockaddr *)&sin;
1485			args.ua.export.ex_masklen = 0;
1486			break;
1487		case GT_NET:
1488			if (grp->gr_ptr.gt_net.nt_mask)
1489			    imask.sin_addr.s_addr = grp->gr_ptr.gt_net.nt_mask;
1490			else {
1491			    net = ntohl(grp->gr_ptr.gt_net.nt_net);
1492			    if (IN_CLASSA(net))
1493				imask.sin_addr.s_addr = inet_addr("255.0.0.0");
1494			    else if (IN_CLASSB(net))
1495				imask.sin_addr.s_addr =
1496				    inet_addr("255.255.0.0");
1497			    else
1498				imask.sin_addr.s_addr =
1499				    inet_addr("255.255.255.0");
1500			    grp->gr_ptr.gt_net.nt_mask = imask.sin_addr.s_addr;
1501			}
1502			sin.sin_addr.s_addr = grp->gr_ptr.gt_net.nt_net;
1503			args.ua.export.ex_addr = (struct sockaddr *)&sin;
1504			args.ua.export.ex_addrlen = sizeof (sin);
1505			args.ua.export.ex_mask = (struct sockaddr *)&imask;
1506			args.ua.export.ex_masklen = sizeof (imask);
1507			break;
1508#ifdef ISO
1509		case GT_ISO:
1510			args.ua.export.ex_addr =
1511				(struct sockaddr *)grp->gr_ptr.gt_isoaddr;
1512			args.ua.export.ex_addrlen =
1513				sizeof(struct sockaddr_iso);
1514			args.ua.export.ex_masklen = 0;
1515			break;
1516#endif	/* ISO */
1517		default:
1518			syslog(LOG_ERR, "Bad grouptype");
1519			if (cp)
1520				*cp = savedc;
1521			return (1);
1522		};
1523
1524		/*
1525		 * XXX:
1526		 * Maybe I should just use the fsb->f_mntonname path instead
1527		 * of looping back up the dirp to the mount point??
1528		 * Also, needs to know how to export all types of local
1529		 * exportable file systems and not just MOUNT_UFS.
1530		 */
1531		while (mount(fsb->f_type, dirp,
1532		       fsb->f_flags | MNT_UPDATE, (caddr_t)&args) < 0) {
1533			if (cp)
1534				*cp-- = savedc;
1535			else
1536				cp = dirp + dirplen - 1;
1537			if (errno == EPERM) {
1538				syslog(LOG_ERR,
1539				   "Can't change attributes for %s.\n", dirp);
1540				return (1);
1541			}
1542			if (opt_flags & OP_ALLDIRS) {
1543				syslog(LOG_ERR, "Not root dir");
1544				return (1);
1545			}
1546			/* back up over the last component */
1547			while (*cp == '/' && cp > dirp)
1548				cp--;
1549			while (*(cp - 1) != '/' && cp > dirp)
1550				cp--;
1551			if (cp == dirp) {
1552				if (debug)
1553					fprintf(stderr,"mnt unsucc\n");
1554				syslog(LOG_ERR, "Can't export %s", dirp);
1555				return (1);
1556			}
1557			savedc = *cp;
1558			*cp = '\0';
1559		}
1560		if (addrp) {
1561			++addrp;
1562			if (*addrp == (u_long *)NULL)
1563				done = TRUE;
1564		} else
1565			done = TRUE;
1566	}
1567	if (cp)
1568		*cp = savedc;
1569	return (0);
1570}
1571
1572/*
1573 * Translate a net address.
1574 */
1575int
1576get_net(cp, net, maskflg)
1577	char *cp;
1578	struct netmsk *net;
1579	int maskflg;
1580{
1581	struct netent *np;
1582	long netaddr;
1583	struct in_addr inetaddr, inetaddr2;
1584	char *name;
1585
1586	if (np = getnetbyname(cp))
1587		inetaddr = inet_makeaddr(np->n_net, 0);
1588	else if (isdigit(*cp)) {
1589		if ((netaddr = inet_network(cp)) == -1)
1590			return (1);
1591		inetaddr = inet_makeaddr(netaddr, 0);
1592		/*
1593		 * Due to arbritrary subnet masks, you don't know how many
1594		 * bits to shift the address to make it into a network,
1595		 * however you do know how to make a network address into
1596		 * a host with host == 0 and then compare them.
1597		 * (What a pest)
1598		 */
1599		if (!maskflg) {
1600			setnetent(0);
1601			while (np = getnetent()) {
1602				inetaddr2 = inet_makeaddr(np->n_net, 0);
1603				if (inetaddr2.s_addr == inetaddr.s_addr)
1604					break;
1605			}
1606			endnetent();
1607		}
1608	} else
1609		return (1);
1610	if (maskflg)
1611		net->nt_mask = inetaddr.s_addr;
1612	else {
1613		if (np)
1614			name = np->n_name;
1615		else
1616			name = inet_ntoa(inetaddr);
1617		net->nt_name = (char *)malloc(strlen(name) + 1);
1618		if (net->nt_name == (char *)NULL)
1619			out_of_mem();
1620		strcpy(net->nt_name, name);
1621		net->nt_net = inetaddr.s_addr;
1622	}
1623	return (0);
1624}
1625
1626/*
1627 * Parse out the next white space separated field
1628 */
1629void
1630nextfield(cp, endcp)
1631	char **cp;
1632	char **endcp;
1633{
1634	char *p;
1635
1636	p = *cp;
1637	while (*p == ' ' || *p == '\t')
1638		p++;
1639	if (*p == '\n' || *p == '\0')
1640		*cp = *endcp = p;
1641	else {
1642		*cp = p++;
1643		while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
1644			p++;
1645		*endcp = p;
1646	}
1647}
1648
1649/*
1650 * Get an exports file line. Skip over blank lines and handle line
1651 * continuations.
1652 */
1653int
1654get_line()
1655{
1656	char *p, *cp;
1657	int len;
1658	int totlen, cont_line;
1659
1660	/*
1661	 * Loop around ignoring blank lines and getting all continuation lines.
1662	 */
1663	p = line;
1664	totlen = 0;
1665	do {
1666		if (fgets(p, LINESIZ - totlen, exp_file) == NULL)
1667			return (0);
1668		len = strlen(p);
1669		cp = p + len - 1;
1670		cont_line = 0;
1671		while (cp >= p &&
1672		    (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) {
1673			if (*cp == '\\')
1674				cont_line = 1;
1675			cp--;
1676			len--;
1677		}
1678		*++cp = '\0';
1679		if (len > 0) {
1680			totlen += len;
1681			if (totlen >= LINESIZ) {
1682				syslog(LOG_ERR, "Exports line too long");
1683				exit(2);
1684			}
1685			p = cp;
1686		}
1687	} while (totlen == 0 || cont_line);
1688	return (1);
1689}
1690
1691/*
1692 * Parse a description of a credential.
1693 */
1694void
1695parsecred(namelist, cr)
1696	char *namelist;
1697	struct ucred *cr;
1698{
1699	char *name;
1700	int cnt;
1701	char *names;
1702	struct passwd *pw;
1703	struct group *gr;
1704	int ngroups, groups[NGROUPS + 1];
1705
1706	/*
1707	 * Set up the unpriviledged user.
1708	 */
1709	cr->cr_ref = 1;
1710	cr->cr_uid = -2;
1711	cr->cr_groups[0] = -2;
1712	cr->cr_ngroups = 1;
1713	/*
1714	 * Get the user's password table entry.
1715	 */
1716	names = strsep(&namelist, " \t\n");
1717	name = strsep(&names, ":");
1718	if (isdigit(*name) || *name == '-')
1719		pw = getpwuid(atoi(name));
1720	else
1721		pw = getpwnam(name);
1722	/*
1723	 * Credentials specified as those of a user.
1724	 */
1725	if (names == NULL) {
1726		if (pw == NULL) {
1727			syslog(LOG_ERR, "Unknown user: %s", name);
1728			return;
1729		}
1730		cr->cr_uid = pw->pw_uid;
1731		ngroups = NGROUPS + 1;
1732		if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups))
1733			syslog(LOG_ERR, "Too many groups");
1734		/*
1735		 * Convert from int's to gid_t's and compress out duplicate
1736		 */
1737		cr->cr_ngroups = ngroups - 1;
1738		cr->cr_groups[0] = groups[0];
1739		for (cnt = 2; cnt < ngroups; cnt++)
1740			cr->cr_groups[cnt - 1] = groups[cnt];
1741		return;
1742	}
1743	/*
1744	 * Explicit credential specified as a colon separated list:
1745	 *	uid:gid:gid:...
1746	 */
1747	if (pw != NULL)
1748		cr->cr_uid = pw->pw_uid;
1749	else if (isdigit(*name) || *name == '-')
1750		cr->cr_uid = atoi(name);
1751	else {
1752		syslog(LOG_ERR, "Unknown user: %s", name);
1753		return;
1754	}
1755	cr->cr_ngroups = 0;
1756	while (names != NULL && *names != '\0' && cr->cr_ngroups < NGROUPS) {
1757		name = strsep(&names, ":");
1758		if (isdigit(*name) || *name == '-') {
1759			cr->cr_groups[cr->cr_ngroups++] = atoi(name);
1760		} else {
1761			if ((gr = getgrnam(name)) == NULL) {
1762				syslog(LOG_ERR, "Unknown group: %s", name);
1763				continue;
1764			}
1765			cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid;
1766		}
1767	}
1768	if (names != NULL && *names != '\0' && cr->cr_ngroups == NGROUPS)
1769		syslog(LOG_ERR, "Too many groups");
1770}
1771
1772#define	STRSIZ	(RPCMNT_NAMELEN+RPCMNT_PATHLEN+50)
1773/*
1774 * Routines that maintain the remote mounttab
1775 */
1776void
1777get_mountlist()
1778{
1779	struct mountlist *mlp, **mlpp;
1780	char *eos, *dirp;
1781	int len;
1782	char str[STRSIZ];
1783	FILE *mlfile;
1784
1785	if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) {
1786		syslog(LOG_ERR, "Can't open %s", _PATH_RMOUNTLIST);
1787		return;
1788	}
1789	mlpp = &mlhead;
1790	while (fgets(str, STRSIZ, mlfile) != NULL) {
1791		if ((dirp = index(str, '\t')) == NULL &&
1792		    (dirp = index(str, ' ')) == NULL)
1793			continue;
1794		mlp = (struct mountlist *)malloc(sizeof (*mlp));
1795		len = dirp-str;
1796		if (len > RPCMNT_NAMELEN)
1797			len = RPCMNT_NAMELEN;
1798		bcopy(str, mlp->ml_host, len);
1799		mlp->ml_host[len] = '\0';
1800		while (*dirp == '\t' || *dirp == ' ')
1801			dirp++;
1802		if ((eos = index(dirp, '\t')) == NULL &&
1803		    (eos = index(dirp, ' ')) == NULL &&
1804		    (eos = index(dirp, '\n')) == NULL)
1805			len = strlen(dirp);
1806		else
1807			len = eos-dirp;
1808		if (len > RPCMNT_PATHLEN)
1809			len = RPCMNT_PATHLEN;
1810		bcopy(dirp, mlp->ml_dirp, len);
1811		mlp->ml_dirp[len] = '\0';
1812		mlp->ml_next = (struct mountlist *)NULL;
1813		*mlpp = mlp;
1814		mlpp = &mlp->ml_next;
1815	}
1816	fclose(mlfile);
1817}
1818
1819void
1820del_mlist(hostp, dirp)
1821	char *hostp, *dirp;
1822{
1823	struct mountlist *mlp, **mlpp;
1824	struct mountlist *mlp2;
1825	FILE *mlfile;
1826	int fnd = 0;
1827
1828	mlpp = &mlhead;
1829	mlp = mlhead;
1830	while (mlp) {
1831		if (!strcmp(mlp->ml_host, hostp) &&
1832		    (!dirp || !strcmp(mlp->ml_dirp, dirp))) {
1833			fnd = 1;
1834			mlp2 = mlp;
1835			*mlpp = mlp = mlp->ml_next;
1836			free((caddr_t)mlp2);
1837		} else {
1838			mlpp = &mlp->ml_next;
1839			mlp = mlp->ml_next;
1840		}
1841	}
1842	if (fnd) {
1843		if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) {
1844			syslog(LOG_ERR,"Can't update %s", _PATH_RMOUNTLIST);
1845			return;
1846		}
1847		mlp = mlhead;
1848		while (mlp) {
1849			fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
1850			mlp = mlp->ml_next;
1851		}
1852		fclose(mlfile);
1853	}
1854}
1855
1856void
1857add_mlist(hostp, dirp)
1858	char *hostp, *dirp;
1859{
1860	struct mountlist *mlp, **mlpp;
1861	FILE *mlfile;
1862
1863	mlpp = &mlhead;
1864	mlp = mlhead;
1865	while (mlp) {
1866		if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp))
1867			return;
1868		mlpp = &mlp->ml_next;
1869		mlp = mlp->ml_next;
1870	}
1871	mlp = (struct mountlist *)malloc(sizeof (*mlp));
1872	strncpy(mlp->ml_host, hostp, RPCMNT_NAMELEN);
1873	mlp->ml_host[RPCMNT_NAMELEN] = '\0';
1874	strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN);
1875	mlp->ml_dirp[RPCMNT_PATHLEN] = '\0';
1876	mlp->ml_next = (struct mountlist *)NULL;
1877	*mlpp = mlp;
1878	if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
1879		syslog(LOG_ERR, "Can't update %s", _PATH_RMOUNTLIST);
1880		return;
1881	}
1882	fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
1883	fclose(mlfile);
1884}
1885
1886/*
1887 * This function is called via. SIGTERM when the system is going down.
1888 * It sends a broadcast RPCMNT_UMNTALL.
1889 */
1890void
1891send_umntall()
1892{
1893	(void) clnt_broadcast(RPCPROG_MNT, RPCMNT_VER1, RPCMNT_UMNTALL,
1894		xdr_void, (caddr_t)0, xdr_void, (caddr_t)0, umntall_each);
1895	exit(0);
1896}
1897
1898int
1899umntall_each(resultsp, raddr)
1900	caddr_t resultsp;
1901	struct sockaddr_in *raddr;
1902{
1903	return (1);
1904}
1905
1906/*
1907 * Free up a group list.
1908 */
1909void
1910free_grp(grp)
1911	struct grouplist *grp;
1912{
1913	char **addrp;
1914
1915	if (grp->gr_type == GT_HOST) {
1916		if (grp->gr_ptr.gt_hostent->h_name) {
1917			addrp = grp->gr_ptr.gt_hostent->h_addr_list;
1918			while (addrp && *addrp)
1919				free(*addrp++);
1920			free((caddr_t)grp->gr_ptr.gt_hostent->h_addr_list);
1921			free(grp->gr_ptr.gt_hostent->h_name);
1922		}
1923		free((caddr_t)grp->gr_ptr.gt_hostent);
1924	} else if (grp->gr_type == GT_NET) {
1925		if (grp->gr_ptr.gt_net.nt_name)
1926			free(grp->gr_ptr.gt_net.nt_name);
1927	}
1928#ifdef ISO
1929	else if (grp->gr_type == GT_ISO)
1930		free((caddr_t)grp->gr_ptr.gt_isoaddr);
1931#endif
1932	free((caddr_t)grp);
1933}
1934
1935#ifdef DEBUG
1936void
1937SYSLOG(int pri, const char *fmt, ...)
1938{
1939	va_list ap;
1940
1941	va_start(ap, fmt);
1942	vfprintf(stderr, fmt, ap);
1943	va_end(ap);
1944}
1945#endif /* DEBUG */
1946
1947/*
1948 * Check options for consistency.
1949 */
1950int
1951check_options(dp)
1952	struct dirlist *dp;
1953{
1954
1955	if (dp == (struct dirlist *)NULL)
1956	    return (1);
1957	if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL) ||
1958	    (opt_flags & (OP_MAPROOT | OP_KERB)) == (OP_MAPROOT | OP_KERB) ||
1959	    (opt_flags & (OP_MAPALL | OP_KERB)) == (OP_MAPALL | OP_KERB)) {
1960	    syslog(LOG_ERR, "-mapall, -maproot and -kerb mutually exclusive");
1961	    return (1);
1962	}
1963	if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) {
1964	    syslog(LOG_ERR, "-mask requires -net");
1965	    return (1);
1966	}
1967	if ((opt_flags & (OP_NET | OP_ISO)) == (OP_NET | OP_ISO)) {
1968	    syslog(LOG_ERR, "-net and -iso mutually exclusive");
1969	    return (1);
1970	}
1971	if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
1972	    syslog(LOG_ERR, "-alldir has multiple directories");
1973	    return (1);
1974	}
1975	return (0);
1976}
1977
1978/*
1979 * Check an absolute directory path for any symbolic links. Return true
1980 * if no symbolic links are found.
1981 */
1982int
1983check_dirpath(dirp)
1984	char *dirp;
1985{
1986	char *cp;
1987	int ret = 1;
1988	struct stat sb;
1989
1990	cp = dirp + 1;
1991	while (*cp && ret) {
1992		if (*cp == '/') {
1993			*cp = '\0';
1994			if (lstat(dirp, &sb) < 0 ||
1995				(sb.st_mode & S_IFMT) != S_IFDIR)
1996				ret = 0;
1997			*cp = '/';
1998		}
1999		cp++;
2000	}
2001	if (lstat(dirp, &sb) < 0 ||
2002		(sb.st_mode & S_IFMT) != S_IFDIR)
2003		ret = 0;
2004	return (ret);
2005}
2006