mountd.c revision ba96b53461e2b4ea9034c2e532e2abbf478772bf
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 const 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
44#if 0
45static char sccsid[] = "@(#)mountd.c	8.15 (Berkeley) 5/1/95";
46#endif
47static const char rcsid[] =
48  "$FreeBSD$";
49#endif /*not lint*/
50
51#include <sys/param.h>
52#include <sys/mount.h>
53#include <sys/fcntl.h>
54#include <sys/stat.h>
55#include <sys/syslog.h>
56#include <sys/sysctl.h>
57
58#include <rpc/rpc.h>
59#include <rpc/pmap_clnt.h>
60#include <rpc/pmap_prot.h>
61#include <rpcsvc/mount.h>
62#include <nfs/rpcv2.h>
63#include <nfs/nfsproto.h>
64#include <nfs/nfs.h>
65#include <ufs/ufs/ufsmount.h>
66#include <msdosfs/msdosfsmount.h>
67#include <ntfs/ntfsmount.h>
68#include <isofs/cd9660/cd9660_mount.h>	/* XXX need isofs in include */
69
70#include <arpa/inet.h>
71
72#include <ctype.h>
73#include <err.h>
74#include <errno.h>
75#include <grp.h>
76#include <netdb.h>
77#include <pwd.h>
78#include <signal.h>
79#include <stdio.h>
80#include <stdlib.h>
81#include <string.h>
82#include <unistd.h>
83#include "pathnames.h"
84
85#ifdef DEBUG
86#include <stdarg.h>
87#endif
88
89#ifndef MOUNTDLOCK
90#define MOUNTDLOCK "/var/run/mountd.lock"
91#endif
92
93/*
94 * Structures for keeping the mount list and export list
95 */
96struct mountlist {
97	struct mountlist *ml_next;
98	char	ml_host[RPCMNT_NAMELEN+1];
99	char	ml_dirp[RPCMNT_PATHLEN+1];
100};
101
102struct dirlist {
103	struct dirlist	*dp_left;
104	struct dirlist	*dp_right;
105	int		dp_flag;
106	struct hostlist	*dp_hosts;	/* List of hosts this dir exported to */
107	char		dp_dirp[1];	/* Actually malloc'd to size of dir */
108};
109/* dp_flag bits */
110#define	DP_DEFSET	0x1
111#define DP_HOSTSET	0x2
112#define DP_KERB		0x4
113
114struct exportlist {
115	struct exportlist *ex_next;
116	struct dirlist	*ex_dirl;
117	struct dirlist	*ex_defdir;
118	int		ex_flag;
119	fsid_t		ex_fs;
120	char		*ex_fsdir;
121	char		*ex_indexfile;
122};
123/* ex_flag bits */
124#define	EX_LINKED	0x1
125
126struct netmsk {
127	struct sockaddr_storage nt_net;
128	struct sockaddr_storage nt_mask;
129	char		*nt_name;
130};
131
132union grouptypes {
133	struct addrinfo *gt_addrinfo;
134	struct netmsk	gt_net;
135};
136
137struct grouplist {
138	int gr_type;
139	union grouptypes gr_ptr;
140	struct grouplist *gr_next;
141};
142/* Group types */
143#define	GT_NULL		0x0
144#define	GT_HOST		0x1
145#define	GT_NET		0x2
146#define	GT_DEFAULT	0x3
147#define GT_IGNORE	0x5
148
149struct hostlist {
150	int		 ht_flag;	/* Uses DP_xx bits */
151	struct grouplist *ht_grp;
152	struct hostlist	 *ht_next;
153};
154
155struct fhreturn {
156	int	fhr_flag;
157	int	fhr_vers;
158	nfsfh_t	fhr_fh;
159};
160
161/* Global defs */
162char	*add_expdir __P((struct dirlist **, char *, int));
163void	add_dlist __P((struct dirlist **, struct dirlist *,
164				struct grouplist *, int));
165void	add_mlist __P((char *, char *));
166int	check_dirpath __P((char *));
167int	check_options __P((struct dirlist *));
168int	checkmask(struct sockaddr *sa);
169int	chk_host __P((struct dirlist *, struct sockaddr *, int *, int *));
170void	del_mlist(char *hostp, char *dirp);
171struct dirlist *dirp_search __P((struct dirlist *, char *));
172int	do_mount __P((struct exportlist *, struct grouplist *, int,
173		struct xucred *, char *, int, struct statfs *));
174int	do_opt __P((char **, char **, struct exportlist *, struct grouplist *,
175				int *, int *, struct xucred *));
176struct	exportlist *ex_search __P((fsid_t *));
177struct	exportlist *get_exp __P((void));
178void	free_dir __P((struct dirlist *));
179void	free_exp __P((struct exportlist *));
180void	free_grp __P((struct grouplist *));
181void	free_host __P((struct hostlist *));
182void	get_exportlist __P((void));
183int	get_host __P((char *, struct grouplist *, struct grouplist *));
184struct hostlist *get_ht __P((void));
185int	get_line __P((void));
186void	get_mountlist __P((void));
187int	get_net __P((char *, struct netmsk *, int));
188void	getexp_err __P((struct exportlist *, struct grouplist *));
189struct grouplist *get_grp __P((void));
190void	hang_dirp __P((struct dirlist *, struct grouplist *,
191				struct exportlist *, int));
192void	huphandler(int sig);
193int	makemask(struct sockaddr_storage *ssp, int bitlen);
194void	mntsrv __P((struct svc_req *, SVCXPRT *));
195void	nextfield __P((char **, char **));
196void	out_of_mem __P((void));
197void	parsecred __P((char *, struct xucred *));
198int	put_exlist __P((struct dirlist *, XDR *, struct dirlist *, int *));
199void	*sa_rawaddr(struct sockaddr *sa, int *nbytes);
200int	sacmp(struct sockaddr *sa1, struct sockaddr *sa2,
201    struct sockaddr *samask);
202int	scan_tree __P((struct dirlist *, struct sockaddr *));
203static void usage __P((void));
204int	xdr_dir __P((XDR *, char *));
205int	xdr_explist __P((XDR *, caddr_t));
206int	xdr_fhs __P((XDR *, caddr_t));
207int	xdr_mlist __P((XDR *, caddr_t));
208void	terminate __P((int));
209
210struct exportlist *exphead;
211struct mountlist *mlhead;
212struct grouplist *grphead;
213char exname[MAXPATHLEN];
214struct xucred def_anon = {
215	0,
216	(uid_t)-2,
217	1,
218	{ (gid_t)-2 },
219	NULL
220};
221int force_v2 = 0;
222int resvport_only = 1;
223int dir_only = 1;
224int log = 0;
225int got_sighup = 0;
226
227int opt_flags;
228static int have_v6 = 1;
229#ifdef NI_WITHSCOPEID
230static const int ninumeric = NI_NUMERICHOST | NI_WITHSCOPEID;
231#else
232static const int ninumeric = NI_NUMERICHOST;
233#endif
234
235int mountdlockfd;
236/* Bits for opt_flags above */
237#define	OP_MAPROOT	0x01
238#define	OP_MAPALL	0x02
239#define	OP_KERB		0x04
240#define	OP_MASK		0x08
241#define	OP_NET		0x10
242#define	OP_ALLDIRS	0x40
243#define	OP_HAVEMASK	0x80	/* A mask was specified or inferred. */
244#define OP_MASKLEN	0x200
245
246#ifdef DEBUG
247int debug = 1;
248void	SYSLOG __P((int, const char *, ...));
249#define syslog SYSLOG
250#else
251int debug = 0;
252#endif
253
254/*
255 * Mountd server for NFS mount protocol as described in:
256 * NFS: Network File System Protocol Specification, RFC1094, Appendix A
257 * The optional arguments are the exports file name
258 * default: _PATH_EXPORTS
259 * and "-n" to allow nonroot mount.
260 */
261int
262main(argc, argv)
263	int argc;
264	char **argv;
265{
266	fd_set readfds;
267	SVCXPRT *udptransp, *tcptransp, *udp6transp, *tcp6transp;
268	struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf;
269	int udpsock, tcpsock, udp6sock, tcp6sock;
270	int xcreated = 0, s;
271	int one = 1;
272	int c, error, mib[3];
273	struct vfsconf vfc;
274
275	udp6conf = tcp6conf = NULL;
276	udp6sock = tcp6sock = NULL;
277
278	/* Check that another mountd isn't already running. */
279	if ((mountdlockfd = (open(MOUNTDLOCK, O_RDONLY|O_CREAT, 0444))) == -1)
280		err(1, "%s", MOUNTDLOCK);
281
282	if(flock(mountdlockfd, LOCK_EX|LOCK_NB) == -1 && errno == EWOULDBLOCK)
283		errx(1, "another rpc.mountd is already running. Aborting");
284	s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
285	if (s < 0)
286		have_v6 = 0;
287	else
288		close(s);
289	error = getvfsbyname("nfs", &vfc);
290	if (error && vfsisloadable("nfs")) {
291		if(vfsload("nfs"))
292			err(1, "vfsload(nfs)");
293		endvfsent();	/* flush cache */
294		error = getvfsbyname("nfs", &vfc);
295	}
296	if (error)
297		errx(1, "NFS support is not available in the running kernel");
298
299	while ((c = getopt(argc, argv, "2dlnr")) != -1)
300		switch (c) {
301		case '2':
302			force_v2 = 1;
303			break;
304		case 'n':
305			resvport_only = 0;
306			break;
307		case 'r':
308			dir_only = 0;
309			break;
310		case 'd':
311			debug = debug ? 0 : 1;
312			break;
313		case 'l':
314			log = 1;
315			break;
316		default:
317			usage();
318		};
319	argc -= optind;
320	argv += optind;
321	grphead = (struct grouplist *)NULL;
322	exphead = (struct exportlist *)NULL;
323	mlhead = (struct mountlist *)NULL;
324	if (argc == 1) {
325		strncpy(exname, *argv, MAXPATHLEN-1);
326		exname[MAXPATHLEN-1] = '\0';
327	} else
328		strcpy(exname, _PATH_EXPORTS);
329	openlog("mountd", LOG_PID, LOG_DAEMON);
330	if (debug)
331		warnx("getting export list");
332	get_exportlist();
333	if (debug)
334		warnx("getting mount list");
335	get_mountlist();
336	if (debug)
337		warnx("here we go");
338	if (debug == 0) {
339		daemon(0, 0);
340		signal(SIGINT, SIG_IGN);
341		signal(SIGQUIT, SIG_IGN);
342	}
343	signal(SIGHUP, huphandler);
344	signal(SIGTERM, terminate);
345	{ FILE *pidfile = fopen(_PATH_MOUNTDPID, "w");
346	  if (pidfile != NULL) {
347		fprintf(pidfile, "%d\n", getpid());
348		fclose(pidfile);
349	  }
350	}
351	rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL);
352	rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL);
353	udpsock  = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
354	tcpsock  = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
355	udpconf  = getnetconfigent("udp");
356	tcpconf  = getnetconfigent("tcp");
357	if (!have_v6)
358		goto skip_v6;
359	udp6sock = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
360	tcp6sock = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
361	/*
362	 * We're doing host-based access checks here, so don't allow
363	 * v4-in-v6 to confuse things. The kernel will disable it
364	 * by default on NFS sockets too.
365	 */
366	if (udp6sock != -1 && setsockopt(udp6sock, IPPROTO_IPV6,
367		IPV6_BINDV6ONLY, &one, sizeof one) < 0){
368		syslog(LOG_ERR, "can't disable v4-in-v6 on UDP socket");
369		exit(1);
370	}
371	if (tcp6sock != -1 && setsockopt(tcp6sock, IPPROTO_IPV6,
372		IPV6_BINDV6ONLY, &one, sizeof one) < 0){
373		syslog(LOG_ERR, "can't disable v4-in-v6 on UDP socket");
374		exit(1);
375	}
376	udp6conf = getnetconfigent("udp6");
377	tcp6conf = getnetconfigent("tcp6");
378
379skip_v6:
380	if (!resvport_only) {
381		mib[0] = CTL_VFS;
382		mib[1] = vfc.vfc_typenum;
383		mib[2] = NFS_NFSPRIVPORT;
384		if (sysctl(mib, 3, NULL, NULL, &resvport_only,
385		    sizeof(resvport_only)) != 0 && errno != ENOENT) {
386			syslog(LOG_ERR, "sysctl: %m");
387			exit(1);
388		}
389	}
390	if ((udptransp = svcudp_create(RPC_ANYSOCK)) == NULL ||
391	    (tcptransp = svctcp_create(RPC_ANYSOCK, 0, 0)) == NULL) {
392		syslog(LOG_ERR, "can't create socket");
393		exit(1);
394	}
395	if (udpsock != -1 && udpconf != NULL) {
396		bindresvport(udpsock, NULL);
397		udptransp = svc_dg_create(udpsock, 0, 0);
398		if (udptransp != NULL) {
399			if (!svc_reg(udptransp, RPCPROG_MNT, RPCMNT_VER1,
400			    mntsrv, udpconf))
401				syslog(LOG_WARNING, "can't register UDP RPCMNT_VER1 service");
402			else
403				xcreated++;
404			if (!force_v2) {
405				if (!svc_reg(udptransp, RPCPROG_MNT, RPCMNT_VER3,
406				    mntsrv, udpconf))
407					syslog(LOG_WARNING, "can't register UDP RPCMNT_VER3 service");
408				else
409					xcreated++;
410			}
411		} else
412			syslog(LOG_WARNING, "can't create UDP services");
413
414	}
415	if (tcpsock != -1 && tcpconf != NULL) {
416		bindresvport(tcpsock, NULL);
417		listen(tcpsock, SOMAXCONN);
418		tcptransp = svc_vc_create(tcpsock, 0, 0);
419		if (tcptransp != NULL) {
420			if (!svc_reg(tcptransp, RPCPROG_MNT, RPCMNT_VER1,
421			    mntsrv, tcpconf))
422				syslog(LOG_WARNING, "can't register TCP RPCMNT_VER1 service");
423			else
424				xcreated++;
425			if (!force_v2) {
426				if (!svc_reg(tcptransp, RPCPROG_MNT, RPCMNT_VER3,
427				    mntsrv, tcpconf))
428					syslog(LOG_WARNING, "can't register TCP RPCMNT_VER3 service");
429				else
430					xcreated++;
431			}
432		} else
433			syslog(LOG_WARNING, "can't create TCP service");
434
435	}
436	if (have_v6 && udp6sock != -1 && udp6conf != NULL) {
437		bindresvport(udp6sock, NULL);
438		udp6transp = svc_dg_create(udp6sock, 0, 0);
439		if (udp6transp != NULL) {
440			if (!svc_reg(udp6transp, RPCPROG_MNT, RPCMNT_VER1,
441			    mntsrv, udp6conf))
442				syslog(LOG_WARNING, "can't register UDP6 RPCMNT_VER1 service");
443			else
444				xcreated++;
445			if (!force_v2) {
446				if (!svc_reg(udp6transp, RPCPROG_MNT, RPCMNT_VER3,
447				    mntsrv, udp6conf))
448					syslog(LOG_WARNING, "can't register UDP6 RPCMNT_VER3 service");
449				else
450					xcreated++;
451			}
452		} else
453			syslog(LOG_WARNING, "can't create UDP6 service");
454
455	}
456	if (have_v6 && tcp6sock != -1 && tcp6conf != NULL) {
457		bindresvport(tcp6sock, NULL);
458		listen(tcp6sock, SOMAXCONN);
459		tcp6transp = svc_vc_create(tcp6sock, 0, 0);
460		if (tcp6transp != NULL) {
461			if (!svc_reg(tcp6transp, RPCPROG_MNT, RPCMNT_VER1,
462			    mntsrv, tcp6conf))
463				syslog(LOG_WARNING, "can't register TCP6 RPCMNT_VER1 service");
464			else
465				xcreated++;
466			if (!force_v2) {
467				if (!svc_reg(tcp6transp, RPCPROG_MNT, RPCMNT_VER3,
468				    mntsrv, tcp6conf))
469					syslog(LOG_WARNING, "can't register TCP6 RPCMNT_VER3 service");
470					else
471						xcreated++;
472				}
473		} else
474			syslog(LOG_WARNING, "can't create TCP6 service");
475
476	}
477	if (xcreated == 0) {
478		syslog(LOG_ERR, "could not create any services");
479		exit(1);
480	}
481
482	/* Expand svc_run() here so that we can call get_exportlist(). */
483	for (;;) {
484		if (got_sighup) {
485			get_exportlist();
486			got_sighup = 0;
487		}
488		readfds = svc_fdset;
489		switch (select(svc_maxfd + 1, &readfds, NULL, NULL, NULL)) {
490		case -1:
491			if (errno == EINTR)
492                                continue;
493			syslog(LOG_ERR, "mountd died: select: %m");
494			exit(1);
495		case 0:
496			continue;
497		default:
498			svc_getreqset(&readfds);
499		}
500	}
501}
502
503static void
504usage()
505{
506	fprintf(stderr,
507		"usage: mountd [-2] [-d] [-l] [-n] [-r] [export_file]\n");
508	exit(1);
509}
510
511/*
512 * The mount rpc service
513 */
514void
515mntsrv(rqstp, transp)
516	struct svc_req *rqstp;
517	SVCXPRT *transp;
518{
519	struct exportlist *ep;
520	struct dirlist *dp;
521	struct fhreturn fhr;
522	struct stat stb;
523	struct statfs fsb;
524	struct addrinfo *ai;
525	char host[NI_MAXHOST], numerichost[NI_MAXHOST];
526	int lookup_failed = 1;
527	struct sockaddr *saddr;
528	u_short sport;
529	char rpcpath[RPCMNT_PATHLEN + 1], dirpath[MAXPATHLEN];
530	int bad = 0, defset, hostset;
531	sigset_t sighup_mask;
532
533	sigemptyset(&sighup_mask);
534	sigaddset(&sighup_mask, SIGHUP);
535	saddr = svc_getrpccaller(transp)->buf;
536	switch (saddr->sa_family) {
537	case AF_INET6:
538		sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port);
539		break;
540	case AF_INET:
541		sport = ntohs(((struct sockaddr_in *)saddr)->sin_port);
542		break;
543	default:
544		syslog(LOG_ERR, "request from unknown address family");
545		return;
546	}
547	lookup_failed = getnameinfo(saddr, saddr->sa_len, host, sizeof host,
548	    NULL, 0, 0);
549	getnameinfo(saddr, saddr->sa_len, numerichost,
550	    sizeof numerichost, NULL, 0, NI_NUMERICHOST);
551	ai = NULL;
552	switch (rqstp->rq_proc) {
553	case NULLPROC:
554		if (!svc_sendreply(transp, xdr_void, (caddr_t)NULL))
555			syslog(LOG_ERR, "can't send reply");
556		return;
557	case RPCMNT_MOUNT:
558		if (sport >= IPPORT_RESERVED && resvport_only) {
559			syslog(LOG_NOTICE,
560			    "mount request from %s from unprivileged port",
561			    numerichost);
562			svcerr_weakauth(transp);
563			return;
564		}
565		if (!svc_getargs(transp, xdr_dir, rpcpath)) {
566			syslog(LOG_NOTICE, "undecodable mount request from %s",
567			    numerichost);
568			svcerr_decode(transp);
569			return;
570		}
571
572		/*
573		 * Get the real pathname and make sure it is a directory
574		 * or a regular file if the -r option was specified
575		 * and it exists.
576		 */
577		if (realpath(rpcpath, dirpath) == NULL ||
578		    stat(dirpath, &stb) < 0 ||
579		    (!S_ISDIR(stb.st_mode) &&
580		    (dir_only || !S_ISREG(stb.st_mode))) ||
581		    statfs(dirpath, &fsb) < 0) {
582			chdir("/");	/* Just in case realpath doesn't */
583			syslog(LOG_NOTICE,
584			    "mount request from %s for non existent path %s",
585			    numerichost, dirpath);
586			if (debug)
587				warnx("stat failed on %s", dirpath);
588			bad = ENOENT;	/* We will send error reply later */
589		}
590
591		/* Check in the exports list */
592		sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
593		ep = ex_search(&fsb.f_fsid);
594		hostset = defset = 0;
595		if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset) ||
596		    ((dp = dirp_search(ep->ex_dirl, dirpath)) &&
597		      chk_host(dp, saddr, &defset, &hostset)) ||
598		    (defset && scan_tree(ep->ex_defdir, saddr) == 0 &&
599		     scan_tree(ep->ex_dirl, saddr) == 0))) {
600			if (bad) {
601				if (!svc_sendreply(transp, xdr_long,
602				    (caddr_t)&bad))
603					syslog(LOG_ERR, "can't send reply");
604				sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
605				return;
606			}
607			if (hostset & DP_HOSTSET)
608				fhr.fhr_flag = hostset;
609			else
610				fhr.fhr_flag = defset;
611			fhr.fhr_vers = rqstp->rq_vers;
612			/* Get the file handle */
613			memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t));
614			if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) {
615				bad = errno;
616				syslog(LOG_ERR, "can't get fh for %s", dirpath);
617				if (!svc_sendreply(transp, xdr_long,
618				    (caddr_t)&bad))
619					syslog(LOG_ERR, "can't send reply");
620				sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
621				return;
622			}
623			if (!svc_sendreply(transp, xdr_fhs, (caddr_t)&fhr))
624				syslog(LOG_ERR, "can't send reply");
625			if (!lookup_failed)
626				add_mlist(host, dirpath);
627			else
628				add_mlist(numerichost, dirpath);
629			if (debug)
630				warnx("mount successful");
631			if (log)
632				syslog(LOG_NOTICE,
633				    "mount request succeeded from %s for %s",
634				    numerichost, dirpath);
635		} else {
636			bad = EACCES;
637			syslog(LOG_NOTICE,
638			    "mount request denied from %s for %s",
639			    numerichost, dirpath);
640		}
641
642		if (bad && !svc_sendreply(transp, xdr_long, (caddr_t)&bad))
643			syslog(LOG_ERR, "can't send reply");
644		sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
645		return;
646	case RPCMNT_DUMP:
647		if (!svc_sendreply(transp, xdr_mlist, (caddr_t)NULL))
648			syslog(LOG_ERR, "can't send reply");
649		else if (log)
650			syslog(LOG_NOTICE,
651			    "dump request succeeded from %s",
652			    numerichost);
653		return;
654	case RPCMNT_UMOUNT:
655		if (sport >= IPPORT_RESERVED && resvport_only) {
656			syslog(LOG_NOTICE,
657			    "umount request from %s from unprivileged port",
658			    numerichost);
659			svcerr_weakauth(transp);
660			return;
661		}
662		if (!svc_getargs(transp, xdr_dir, rpcpath)) {
663			syslog(LOG_NOTICE, "undecodable umount request from %s",
664			    numerichost);
665			svcerr_decode(transp);
666			return;
667		}
668		if (realpath(rpcpath, dirpath) == NULL) {
669			syslog(LOG_NOTICE, "umount request from %s "
670			    "for non existent path %s",
671			    numerichost, dirpath);
672		}
673		if (!svc_sendreply(transp, xdr_void, (caddr_t)NULL))
674			syslog(LOG_ERR, "can't send reply");
675		if (!lookup_failed)
676			del_mlist(host, dirpath);
677		del_mlist(numerichost, dirpath);
678		if (log)
679			syslog(LOG_NOTICE,
680			    "umount request succeeded from %s for %s",
681			    numerichost, dirpath);
682		return;
683	case RPCMNT_UMNTALL:
684		if (sport >= IPPORT_RESERVED && resvport_only) {
685			syslog(LOG_NOTICE,
686			    "umountall request from %s from unprivileged port",
687			    numerichost);
688			svcerr_weakauth(transp);
689			return;
690		}
691		if (!svc_sendreply(transp, xdr_void, (caddr_t)NULL))
692			syslog(LOG_ERR, "can't send reply");
693		if (!lookup_failed)
694			del_mlist(host, NULL);
695		del_mlist(numerichost, NULL);
696		if (log)
697			syslog(LOG_NOTICE,
698			    "umountall request succeeded from %s",
699			    numerichost);
700		return;
701	case RPCMNT_EXPORT:
702		if (!svc_sendreply(transp, xdr_explist, (caddr_t)NULL))
703			syslog(LOG_ERR, "can't send reply");
704		if (log)
705			syslog(LOG_NOTICE,
706			    "export request succeeded from %s",
707			    numerichost);
708		return;
709	default:
710		svcerr_noproc(transp);
711		return;
712	}
713}
714
715/*
716 * Xdr conversion for a dirpath string
717 */
718int
719xdr_dir(xdrsp, dirp)
720	XDR *xdrsp;
721	char *dirp;
722{
723	return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
724}
725
726/*
727 * Xdr routine to generate file handle reply
728 */
729int
730xdr_fhs(xdrsp, cp)
731	XDR *xdrsp;
732	caddr_t cp;
733{
734	register struct fhreturn *fhrp = (struct fhreturn *)cp;
735	u_long ok = 0, len, auth;
736
737	if (!xdr_long(xdrsp, &ok))
738		return (0);
739	switch (fhrp->fhr_vers) {
740	case 1:
741		return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH));
742	case 3:
743		len = NFSX_V3FH;
744		if (!xdr_long(xdrsp, &len))
745			return (0);
746		if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len))
747			return (0);
748		if (fhrp->fhr_flag & DP_KERB)
749			auth = RPCAUTH_KERB4;
750		else
751			auth = RPCAUTH_UNIX;
752		len = 1;
753		if (!xdr_long(xdrsp, &len))
754			return (0);
755		return (xdr_long(xdrsp, &auth));
756	};
757	return (0);
758}
759
760int
761xdr_mlist(xdrsp, cp)
762	XDR *xdrsp;
763	caddr_t cp;
764{
765	struct mountlist *mlp;
766	int true = 1;
767	int false = 0;
768	char *strp;
769
770	mlp = mlhead;
771	while (mlp) {
772		if (!xdr_bool(xdrsp, &true))
773			return (0);
774		strp = &mlp->ml_host[0];
775		if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
776			return (0);
777		strp = &mlp->ml_dirp[0];
778		if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
779			return (0);
780		mlp = mlp->ml_next;
781	}
782	if (!xdr_bool(xdrsp, &false))
783		return (0);
784	return (1);
785}
786
787/*
788 * Xdr conversion for export list
789 */
790int
791xdr_explist(xdrsp, cp)
792	XDR *xdrsp;
793	caddr_t cp;
794{
795	struct exportlist *ep;
796	int false = 0;
797	int putdef;
798	sigset_t sighup_mask;
799
800	sigemptyset(&sighup_mask);
801	sigaddset(&sighup_mask, SIGHUP);
802	sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
803	ep = exphead;
804	while (ep) {
805		putdef = 0;
806		if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir, &putdef))
807			goto errout;
808		if (ep->ex_defdir && putdef == 0 &&
809			put_exlist(ep->ex_defdir, xdrsp, (struct dirlist *)NULL,
810			&putdef))
811			goto errout;
812		ep = ep->ex_next;
813	}
814	sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
815	if (!xdr_bool(xdrsp, &false))
816		return (0);
817	return (1);
818errout:
819	sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
820	return (0);
821}
822
823/*
824 * Called from xdr_explist() to traverse the tree and export the
825 * directory paths.
826 */
827int
828put_exlist(dp, xdrsp, adp, putdefp)
829	struct dirlist *dp;
830	XDR *xdrsp;
831	struct dirlist *adp;
832	int *putdefp;
833{
834	struct grouplist *grp;
835	struct hostlist *hp;
836	int true = 1;
837	int false = 0;
838	int gotalldir = 0;
839	char *strp;
840
841	if (dp) {
842		if (put_exlist(dp->dp_left, xdrsp, adp, putdefp))
843			return (1);
844		if (!xdr_bool(xdrsp, &true))
845			return (1);
846		strp = dp->dp_dirp;
847		if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
848			return (1);
849		if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) {
850			gotalldir = 1;
851			*putdefp = 1;
852		}
853		if ((dp->dp_flag & DP_DEFSET) == 0 &&
854		    (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) {
855			hp = dp->dp_hosts;
856			while (hp) {
857				grp = hp->ht_grp;
858				if (grp->gr_type == GT_HOST) {
859					if (!xdr_bool(xdrsp, &true))
860						return (1);
861					strp = grp->gr_ptr.gt_addrinfo->ai_canonname;
862					if (!xdr_string(xdrsp, &strp,
863					    RPCMNT_NAMELEN))
864						return (1);
865				} else if (grp->gr_type == GT_NET) {
866					if (!xdr_bool(xdrsp, &true))
867						return (1);
868					strp = grp->gr_ptr.gt_net.nt_name;
869					if (!xdr_string(xdrsp, &strp,
870					    RPCMNT_NAMELEN))
871						return (1);
872				}
873				hp = hp->ht_next;
874				if (gotalldir && hp == (struct hostlist *)NULL) {
875					hp = adp->dp_hosts;
876					gotalldir = 0;
877				}
878			}
879		}
880		if (!xdr_bool(xdrsp, &false))
881			return (1);
882		if (put_exlist(dp->dp_right, xdrsp, adp, putdefp))
883			return (1);
884	}
885	return (0);
886}
887
888#define LINESIZ	10240
889char line[LINESIZ];
890FILE *exp_file;
891
892/*
893 * Get the export list
894 */
895void
896get_exportlist()
897{
898	struct exportlist *ep, *ep2;
899	struct grouplist *grp, *tgrp;
900	struct exportlist **epp;
901	struct dirlist *dirhead;
902	struct statfs fsb, *fsp;
903	struct xucred anon;
904	char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc;
905	int len, has_host, exflags, got_nondir, dirplen, num, i, netgrp;
906
907	dirp = NULL;
908	dirplen = 0;
909
910	/*
911	 * First, get rid of the old list
912	 */
913	ep = exphead;
914	while (ep) {
915		ep2 = ep;
916		ep = ep->ex_next;
917		free_exp(ep2);
918	}
919	exphead = (struct exportlist *)NULL;
920
921	grp = grphead;
922	while (grp) {
923		tgrp = grp;
924		grp = grp->gr_next;
925		free_grp(tgrp);
926	}
927	grphead = (struct grouplist *)NULL;
928
929	/*
930	 * And delete exports that are in the kernel for all local
931	 * file systems.
932	 * XXX: Should know how to handle all local exportable file systems
933	 *      instead of just "ufs".
934	 */
935	num = getmntinfo(&fsp, MNT_NOWAIT);
936	for (i = 0; i < num; i++) {
937		union {
938			struct ufs_args ua;
939			struct iso_args ia;
940			struct mfs_args ma;
941			struct msdosfs_args da;
942			struct ntfs_args na;
943		} targs;
944
945		if (!strcmp(fsp->f_fstypename, "mfs") ||
946		    !strcmp(fsp->f_fstypename, "ufs") ||
947		    !strcmp(fsp->f_fstypename, "msdos") ||
948		    !strcmp(fsp->f_fstypename, "ntfs") ||
949		    !strcmp(fsp->f_fstypename, "cd9660")) {
950			targs.ua.fspec = NULL;
951			targs.ua.export.ex_flags = MNT_DELEXPORT;
952			if (mount(fsp->f_fstypename, fsp->f_mntonname,
953				  fsp->f_flags | MNT_UPDATE,
954				  (caddr_t)&targs) < 0)
955				syslog(LOG_ERR, "can't delete exports for %s",
956				    fsp->f_mntonname);
957		}
958		fsp++;
959	}
960
961	/*
962	 * Read in the exports file and build the list, calling
963	 * mount() as we go along to push the export rules into the kernel.
964	 */
965	if ((exp_file = fopen(exname, "r")) == NULL) {
966		syslog(LOG_ERR, "can't open %s", exname);
967		exit(2);
968	}
969	dirhead = (struct dirlist *)NULL;
970	while (get_line()) {
971		if (debug)
972			warnx("got line %s", line);
973		cp = line;
974		nextfield(&cp, &endcp);
975		if (*cp == '#')
976			goto nextline;
977
978		/*
979		 * Set defaults.
980		 */
981		has_host = FALSE;
982		anon = def_anon;
983		exflags = MNT_EXPORTED;
984		got_nondir = 0;
985		opt_flags = 0;
986		ep = (struct exportlist *)NULL;
987
988		/*
989		 * Create new exports list entry
990		 */
991		len = endcp-cp;
992		tgrp = grp = get_grp();
993		while (len > 0) {
994			if (len > RPCMNT_NAMELEN) {
995			    getexp_err(ep, tgrp);
996			    goto nextline;
997			}
998			if (*cp == '-') {
999			    if (ep == (struct exportlist *)NULL) {
1000				getexp_err(ep, tgrp);
1001				goto nextline;
1002			    }
1003			    if (debug)
1004				warnx("doing opt %s", cp);
1005			    got_nondir = 1;
1006			    if (do_opt(&cp, &endcp, ep, grp, &has_host,
1007				&exflags, &anon)) {
1008				getexp_err(ep, tgrp);
1009				goto nextline;
1010			    }
1011			} else if (*cp == '/') {
1012			    savedc = *endcp;
1013			    *endcp = '\0';
1014			    if (check_dirpath(cp) &&
1015				statfs(cp, &fsb) >= 0) {
1016				if (got_nondir) {
1017				    syslog(LOG_ERR, "dirs must be first");
1018				    getexp_err(ep, tgrp);
1019				    goto nextline;
1020				}
1021				if (ep) {
1022				    if (ep->ex_fs.val[0] != fsb.f_fsid.val[0] ||
1023					ep->ex_fs.val[1] != fsb.f_fsid.val[1]) {
1024					getexp_err(ep, tgrp);
1025					goto nextline;
1026				    }
1027				} else {
1028				    /*
1029				     * See if this directory is already
1030				     * in the list.
1031				     */
1032				    ep = ex_search(&fsb.f_fsid);
1033				    if (ep == (struct exportlist *)NULL) {
1034					ep = get_exp();
1035					ep->ex_fs = fsb.f_fsid;
1036					ep->ex_fsdir = (char *)
1037					    malloc(strlen(fsb.f_mntonname) + 1);
1038					if (ep->ex_fsdir)
1039					    strcpy(ep->ex_fsdir,
1040						fsb.f_mntonname);
1041					else
1042					    out_of_mem();
1043					if (debug)
1044						warnx("making new ep fs=0x%x,0x%x",
1045						    fsb.f_fsid.val[0],
1046						    fsb.f_fsid.val[1]);
1047				    } else if (debug)
1048					warnx("found ep fs=0x%x,0x%x",
1049					    fsb.f_fsid.val[0],
1050					    fsb.f_fsid.val[1]);
1051				}
1052
1053				/*
1054				 * Add dirpath to export mount point.
1055				 */
1056				dirp = add_expdir(&dirhead, cp, len);
1057				dirplen = len;
1058			    } else {
1059				getexp_err(ep, tgrp);
1060				goto nextline;
1061			    }
1062			    *endcp = savedc;
1063			} else {
1064			    savedc = *endcp;
1065			    *endcp = '\0';
1066			    got_nondir = 1;
1067			    if (ep == (struct exportlist *)NULL) {
1068				getexp_err(ep, tgrp);
1069				goto nextline;
1070			    }
1071
1072			    /*
1073			     * Get the host or netgroup.
1074			     */
1075			    setnetgrent(cp);
1076			    netgrp = getnetgrent(&hst, &usr, &dom);
1077			    do {
1078				if (has_host) {
1079				    grp->gr_next = get_grp();
1080				    grp = grp->gr_next;
1081				}
1082				if (netgrp) {
1083				    if (hst == 0) {
1084					syslog(LOG_ERR,
1085				"null hostname in netgroup %s, skipping", cp);
1086					grp->gr_type = GT_IGNORE;
1087				    } else if (get_host(hst, grp, tgrp)) {
1088					syslog(LOG_ERR,
1089			"bad host %s in netgroup %s, skipping", hst, cp);
1090					grp->gr_type = GT_IGNORE;
1091				    }
1092				} else if (get_host(cp, grp, tgrp)) {
1093				    syslog(LOG_ERR, "bad host %s, skipping", cp);
1094				    grp->gr_type = GT_IGNORE;
1095				}
1096				has_host = TRUE;
1097			    } while (netgrp && getnetgrent(&hst, &usr, &dom));
1098			    endnetgrent();
1099			    *endcp = savedc;
1100			}
1101			cp = endcp;
1102			nextfield(&cp, &endcp);
1103			len = endcp - cp;
1104		}
1105		if (check_options(dirhead)) {
1106			getexp_err(ep, tgrp);
1107			goto nextline;
1108		}
1109		if (!has_host) {
1110			grp->gr_type = GT_DEFAULT;
1111			if (debug)
1112				warnx("adding a default entry");
1113
1114		/*
1115		 * Don't allow a network export coincide with a list of
1116		 * host(s) on the same line.
1117		 */
1118		} else if ((opt_flags & OP_NET) && tgrp->gr_next) {
1119			syslog(LOG_ERR, "network/host conflict");
1120			getexp_err(ep, tgrp);
1121			goto nextline;
1122
1123		/*
1124		 * If an export list was specified on this line, make sure
1125		 * that we have at least one valid entry, otherwise skip it.
1126		 */
1127		} else {
1128			grp = tgrp;
1129			while (grp && grp->gr_type == GT_IGNORE)
1130				grp = grp->gr_next;
1131			if (! grp) {
1132			    getexp_err(ep, tgrp);
1133			    goto nextline;
1134			}
1135		}
1136
1137		/*
1138		 * Loop through hosts, pushing the exports into the kernel.
1139		 * After loop, tgrp points to the start of the list and
1140		 * grp points to the last entry in the list.
1141		 */
1142		grp = tgrp;
1143		do {
1144			if (do_mount(ep, grp, exflags, &anon, dirp, dirplen,
1145			    &fsb)) {
1146				getexp_err(ep, tgrp);
1147				goto nextline;
1148			}
1149		} while (grp->gr_next && (grp = grp->gr_next));
1150
1151		/*
1152		 * Success. Update the data structures.
1153		 */
1154		if (has_host) {
1155			hang_dirp(dirhead, tgrp, ep, opt_flags);
1156			grp->gr_next = grphead;
1157			grphead = tgrp;
1158		} else {
1159			hang_dirp(dirhead, (struct grouplist *)NULL, ep,
1160				opt_flags);
1161			free_grp(grp);
1162		}
1163		dirhead = (struct dirlist *)NULL;
1164		if ((ep->ex_flag & EX_LINKED) == 0) {
1165			ep2 = exphead;
1166			epp = &exphead;
1167
1168			/*
1169			 * Insert in the list in alphabetical order.
1170			 */
1171			while (ep2 && strcmp(ep2->ex_fsdir, ep->ex_fsdir) < 0) {
1172				epp = &ep2->ex_next;
1173				ep2 = ep2->ex_next;
1174			}
1175			if (ep2)
1176				ep->ex_next = ep2;
1177			*epp = ep;
1178			ep->ex_flag |= EX_LINKED;
1179		}
1180nextline:
1181		if (dirhead) {
1182			free_dir(dirhead);
1183			dirhead = (struct dirlist *)NULL;
1184		}
1185	}
1186	fclose(exp_file);
1187}
1188
1189/*
1190 * Allocate an export list element
1191 */
1192struct exportlist *
1193get_exp()
1194{
1195	struct exportlist *ep;
1196
1197	ep = (struct exportlist *)malloc(sizeof (struct exportlist));
1198	if (ep == (struct exportlist *)NULL)
1199		out_of_mem();
1200	memset(ep, 0, sizeof(struct exportlist));
1201	return (ep);
1202}
1203
1204/*
1205 * Allocate a group list element
1206 */
1207struct grouplist *
1208get_grp()
1209{
1210	struct grouplist *gp;
1211
1212	gp = (struct grouplist *)malloc(sizeof (struct grouplist));
1213	if (gp == (struct grouplist *)NULL)
1214		out_of_mem();
1215	memset(gp, 0, sizeof(struct grouplist));
1216	return (gp);
1217}
1218
1219/*
1220 * Clean up upon an error in get_exportlist().
1221 */
1222void
1223getexp_err(ep, grp)
1224	struct exportlist *ep;
1225	struct grouplist *grp;
1226{
1227	struct grouplist *tgrp;
1228
1229	syslog(LOG_ERR, "bad exports list line %s", line);
1230	if (ep && (ep->ex_flag & EX_LINKED) == 0)
1231		free_exp(ep);
1232	while (grp) {
1233		tgrp = grp;
1234		grp = grp->gr_next;
1235		free_grp(tgrp);
1236	}
1237}
1238
1239/*
1240 * Search the export list for a matching fs.
1241 */
1242struct exportlist *
1243ex_search(fsid)
1244	fsid_t *fsid;
1245{
1246	struct exportlist *ep;
1247
1248	ep = exphead;
1249	while (ep) {
1250		if (ep->ex_fs.val[0] == fsid->val[0] &&
1251		    ep->ex_fs.val[1] == fsid->val[1])
1252			return (ep);
1253		ep = ep->ex_next;
1254	}
1255	return (ep);
1256}
1257
1258/*
1259 * Add a directory path to the list.
1260 */
1261char *
1262add_expdir(dpp, cp, len)
1263	struct dirlist **dpp;
1264	char *cp;
1265	int len;
1266{
1267	struct dirlist *dp;
1268
1269	dp = (struct dirlist *)malloc(sizeof (struct dirlist) + len);
1270	if (dp == (struct dirlist *)NULL)
1271		out_of_mem();
1272	dp->dp_left = *dpp;
1273	dp->dp_right = (struct dirlist *)NULL;
1274	dp->dp_flag = 0;
1275	dp->dp_hosts = (struct hostlist *)NULL;
1276	strcpy(dp->dp_dirp, cp);
1277	*dpp = dp;
1278	return (dp->dp_dirp);
1279}
1280
1281/*
1282 * Hang the dir list element off the dirpath binary tree as required
1283 * and update the entry for host.
1284 */
1285void
1286hang_dirp(dp, grp, ep, flags)
1287	struct dirlist *dp;
1288	struct grouplist *grp;
1289	struct exportlist *ep;
1290	int flags;
1291{
1292	struct hostlist *hp;
1293	struct dirlist *dp2;
1294
1295	if (flags & OP_ALLDIRS) {
1296		if (ep->ex_defdir)
1297			free((caddr_t)dp);
1298		else
1299			ep->ex_defdir = dp;
1300		if (grp == (struct grouplist *)NULL) {
1301			ep->ex_defdir->dp_flag |= DP_DEFSET;
1302			if (flags & OP_KERB)
1303				ep->ex_defdir->dp_flag |= DP_KERB;
1304		} else while (grp) {
1305			hp = get_ht();
1306			if (flags & OP_KERB)
1307				hp->ht_flag |= DP_KERB;
1308			hp->ht_grp = grp;
1309			hp->ht_next = ep->ex_defdir->dp_hosts;
1310			ep->ex_defdir->dp_hosts = hp;
1311			grp = grp->gr_next;
1312		}
1313	} else {
1314
1315		/*
1316		 * Loop through the directories adding them to the tree.
1317		 */
1318		while (dp) {
1319			dp2 = dp->dp_left;
1320			add_dlist(&ep->ex_dirl, dp, grp, flags);
1321			dp = dp2;
1322		}
1323	}
1324}
1325
1326/*
1327 * Traverse the binary tree either updating a node that is already there
1328 * for the new directory or adding the new node.
1329 */
1330void
1331add_dlist(dpp, newdp, grp, flags)
1332	struct dirlist **dpp;
1333	struct dirlist *newdp;
1334	struct grouplist *grp;
1335	int flags;
1336{
1337	struct dirlist *dp;
1338	struct hostlist *hp;
1339	int cmp;
1340
1341	dp = *dpp;
1342	if (dp) {
1343		cmp = strcmp(dp->dp_dirp, newdp->dp_dirp);
1344		if (cmp > 0) {
1345			add_dlist(&dp->dp_left, newdp, grp, flags);
1346			return;
1347		} else if (cmp < 0) {
1348			add_dlist(&dp->dp_right, newdp, grp, flags);
1349			return;
1350		} else
1351			free((caddr_t)newdp);
1352	} else {
1353		dp = newdp;
1354		dp->dp_left = (struct dirlist *)NULL;
1355		*dpp = dp;
1356	}
1357	if (grp) {
1358
1359		/*
1360		 * Hang all of the host(s) off of the directory point.
1361		 */
1362		do {
1363			hp = get_ht();
1364			if (flags & OP_KERB)
1365				hp->ht_flag |= DP_KERB;
1366			hp->ht_grp = grp;
1367			hp->ht_next = dp->dp_hosts;
1368			dp->dp_hosts = hp;
1369			grp = grp->gr_next;
1370		} while (grp);
1371	} else {
1372		dp->dp_flag |= DP_DEFSET;
1373		if (flags & OP_KERB)
1374			dp->dp_flag |= DP_KERB;
1375	}
1376}
1377
1378/*
1379 * Search for a dirpath on the export point.
1380 */
1381struct dirlist *
1382dirp_search(dp, dirp)
1383	struct dirlist *dp;
1384	char *dirp;
1385{
1386	int cmp;
1387
1388	if (dp) {
1389		cmp = strcmp(dp->dp_dirp, dirp);
1390		if (cmp > 0)
1391			return (dirp_search(dp->dp_left, dirp));
1392		else if (cmp < 0)
1393			return (dirp_search(dp->dp_right, dirp));
1394		else
1395			return (dp);
1396	}
1397	return (dp);
1398}
1399
1400/*
1401 * Scan for a host match in a directory tree.
1402 */
1403int
1404chk_host(dp, saddr, defsetp, hostsetp)
1405	struct dirlist *dp;
1406	struct sockaddr *saddr;
1407	int *defsetp;
1408	int *hostsetp;
1409{
1410	struct hostlist *hp;
1411	struct grouplist *grp;
1412	struct addrinfo *ai;
1413
1414	if (dp) {
1415		if (dp->dp_flag & DP_DEFSET)
1416			*defsetp = dp->dp_flag;
1417		hp = dp->dp_hosts;
1418		while (hp) {
1419			grp = hp->ht_grp;
1420			switch (grp->gr_type) {
1421			case GT_HOST:
1422				ai = grp->gr_ptr.gt_addrinfo;
1423				for (; ai; ai = ai->ai_next) {
1424					if (!sacmp(ai->ai_addr, saddr, NULL)) {
1425						*hostsetp =
1426						    (hp->ht_flag | DP_HOSTSET);
1427						return (1);
1428					}
1429				}
1430				break;
1431			case GT_NET:
1432				if (!sacmp(saddr, (struct sockaddr *)
1433				    &grp->gr_ptr.gt_net.nt_net,
1434				    (struct sockaddr *)
1435				    &grp->gr_ptr.gt_net.nt_mask)) {
1436					*hostsetp = (hp->ht_flag | DP_HOSTSET);
1437					return (1);
1438				}
1439				break;
1440			}
1441			hp = hp->ht_next;
1442		}
1443	}
1444	return (0);
1445}
1446
1447/*
1448 * Scan tree for a host that matches the address.
1449 */
1450int
1451scan_tree(dp, saddr)
1452	struct dirlist *dp;
1453	struct sockaddr *saddr;
1454{
1455	int defset, hostset;
1456
1457	if (dp) {
1458		if (scan_tree(dp->dp_left, saddr))
1459			return (1);
1460		if (chk_host(dp, saddr, &defset, &hostset))
1461			return (1);
1462		if (scan_tree(dp->dp_right, saddr))
1463			return (1);
1464	}
1465	return (0);
1466}
1467
1468/*
1469 * Traverse the dirlist tree and free it up.
1470 */
1471void
1472free_dir(dp)
1473	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 */
1489int
1490do_opt(cpp, endcpp, ep, grp, has_hostp, exflagsp, cr)
1491	char **cpp, **endcpp;
1492	struct exportlist *ep;
1493	struct grouplist *grp;
1494	int *has_hostp;
1495	int *exflagsp;
1496	struct xucred *cr;
1497{
1498	char *cpoptarg, *cpoptend;
1499	char *cp, *endcp, *cpopt, savedc, savedc2;
1500	int allflag, usedarg;
1501
1502	savedc2 = '\0';
1503	cpopt = *cpp;
1504	cpopt++;
1505	cp = *endcpp;
1506	savedc = *cp;
1507	*cp = '\0';
1508	while (cpopt && *cpopt) {
1509		allflag = 1;
1510		usedarg = -2;
1511		if ((cpoptend = strchr(cpopt, ','))) {
1512			*cpoptend++ = '\0';
1513			if ((cpoptarg = strchr(cpopt, '=')))
1514				*cpoptarg++ = '\0';
1515		} else {
1516			if ((cpoptarg = strchr(cpopt, '=')))
1517				*cpoptarg++ = '\0';
1518			else {
1519				*cp = savedc;
1520				nextfield(&cp, &endcp);
1521				**endcpp = '\0';
1522				if (endcp > cp && *cp != '-') {
1523					cpoptarg = cp;
1524					savedc2 = *endcp;
1525					*endcp = '\0';
1526					usedarg = 0;
1527				}
1528			}
1529		}
1530		if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) {
1531			*exflagsp |= MNT_EXRDONLY;
1532		} else if (cpoptarg && (!strcmp(cpopt, "maproot") ||
1533		    !(allflag = strcmp(cpopt, "mapall")) ||
1534		    !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) {
1535			usedarg++;
1536			parsecred(cpoptarg, cr);
1537			if (allflag == 0) {
1538				*exflagsp |= MNT_EXPORTANON;
1539				opt_flags |= OP_MAPALL;
1540			} else
1541				opt_flags |= OP_MAPROOT;
1542		} else if (!strcmp(cpopt, "kerb") || !strcmp(cpopt, "k")) {
1543			*exflagsp |= MNT_EXKERB;
1544			opt_flags |= OP_KERB;
1545		} else if (cpoptarg && (!strcmp(cpopt, "mask") ||
1546		    !strcmp(cpopt, "m"))) {
1547			if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) {
1548				syslog(LOG_ERR, "bad mask: %s", cpoptarg);
1549				return (1);
1550			}
1551			usedarg++;
1552			opt_flags |= OP_MASK;
1553		} else if (cpoptarg && (!strcmp(cpopt, "network") ||
1554			!strcmp(cpopt, "n"))) {
1555			if (strchr(cpoptarg, '/') != NULL) {
1556				if (debug)
1557					fprintf(stderr, "setting OP_MASKLEN\n");
1558				opt_flags |= OP_MASKLEN;
1559			}
1560			if (grp->gr_type != GT_NULL) {
1561				syslog(LOG_ERR, "network/host conflict");
1562				return (1);
1563			} else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) {
1564				syslog(LOG_ERR, "bad net: %s", cpoptarg);
1565				return (1);
1566			}
1567			grp->gr_type = GT_NET;
1568			*has_hostp = 1;
1569			usedarg++;
1570			opt_flags |= OP_NET;
1571		} else if (!strcmp(cpopt, "alldirs")) {
1572			opt_flags |= OP_ALLDIRS;
1573		} else if (!strcmp(cpopt, "public")) {
1574			*exflagsp |= MNT_EXPUBLIC;
1575		} else if (!strcmp(cpopt, "webnfs")) {
1576			*exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON);
1577			opt_flags |= OP_MAPALL;
1578		} else if (cpoptarg && !strcmp(cpopt, "index")) {
1579			ep->ex_indexfile = strdup(cpoptarg);
1580		} else {
1581			syslog(LOG_ERR, "bad opt %s", cpopt);
1582			return (1);
1583		}
1584		if (usedarg >= 0) {
1585			*endcp = savedc2;
1586			**endcpp = savedc;
1587			if (usedarg > 0) {
1588				*cpp = cp;
1589				*endcpp = endcp;
1590			}
1591			return (0);
1592		}
1593		cpopt = cpoptend;
1594	}
1595	**endcpp = savedc;
1596	return (0);
1597}
1598
1599/*
1600 * Translate a character string to the corresponding list of network
1601 * addresses for a hostname.
1602 */
1603int
1604get_host(cp, grp, tgrp)
1605	char *cp;
1606	struct grouplist *grp;
1607	struct grouplist *tgrp;
1608{
1609	struct grouplist *checkgrp;
1610	struct addrinfo *ai, *tai, hints;
1611	int ecode;
1612	char host[NI_MAXHOST];
1613
1614	if (grp->gr_type != GT_NULL) {
1615		syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp);
1616		return (1);
1617	}
1618	memset(&hints, 0, sizeof hints);
1619	hints.ai_flags = AI_CANONNAME;
1620	hints.ai_protocol = IPPROTO_UDP;
1621	ecode = getaddrinfo(cp, NULL, &hints, &ai);
1622	if (ecode != 0) {
1623		syslog(LOG_ERR,"can't get address info for host %s", cp);
1624		return 1;
1625	}
1626	grp->gr_ptr.gt_addrinfo = ai;
1627	while (ai != NULL) {
1628		if (ai->ai_canonname == NULL) {
1629			if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host,
1630			    sizeof host, NULL, 0, ninumeric) != 0)
1631				strlcpy(host, "?", sizeof(host));
1632			ai->ai_canonname = strdup(host);
1633			ai->ai_flags |= AI_CANONNAME;
1634		}
1635		if (debug)
1636			fprintf(stderr, "got host %s\n", ai->ai_canonname);
1637		/*
1638		 * Sanity check: make sure we don't already have an entry
1639		 * for this host in the grouplist.
1640		 */
1641		for (checkgrp = tgrp; checkgrp != NULL;
1642		    checkgrp = checkgrp->gr_next) {
1643			if (checkgrp->gr_type != GT_HOST)
1644				continue;
1645			for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL;
1646			    tai = tai->ai_next) {
1647				if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0)
1648					continue;
1649				if (debug)
1650					fprintf(stderr,
1651					    "ignoring duplicate host %s\n",
1652					    ai->ai_canonname);
1653				grp->gr_type = GT_IGNORE;
1654				return (0);
1655			}
1656		}
1657		ai = ai->ai_next;
1658	}
1659	grp->gr_type = GT_HOST;
1660	return (0);
1661}
1662
1663/*
1664 * Free up an exports list component
1665 */
1666void
1667free_exp(ep)
1668	struct exportlist *ep;
1669{
1670
1671	if (ep->ex_defdir) {
1672		free_host(ep->ex_defdir->dp_hosts);
1673		free((caddr_t)ep->ex_defdir);
1674	}
1675	if (ep->ex_fsdir)
1676		free(ep->ex_fsdir);
1677	if (ep->ex_indexfile)
1678		free(ep->ex_indexfile);
1679	free_dir(ep->ex_dirl);
1680	free((caddr_t)ep);
1681}
1682
1683/*
1684 * Free hosts.
1685 */
1686void
1687free_host(hp)
1688	struct hostlist *hp;
1689{
1690	struct hostlist *hp2;
1691
1692	while (hp) {
1693		hp2 = hp;
1694		hp = hp->ht_next;
1695		free((caddr_t)hp2);
1696	}
1697}
1698
1699struct hostlist *
1700get_ht()
1701{
1702	struct hostlist *hp;
1703
1704	hp = (struct hostlist *)malloc(sizeof (struct hostlist));
1705	if (hp == (struct hostlist *)NULL)
1706		out_of_mem();
1707	hp->ht_next = (struct hostlist *)NULL;
1708	hp->ht_flag = 0;
1709	return (hp);
1710}
1711
1712/*
1713 * Out of memory, fatal
1714 */
1715void
1716out_of_mem()
1717{
1718
1719	syslog(LOG_ERR, "out of memory");
1720	exit(2);
1721}
1722
1723/*
1724 * Do the mount syscall with the update flag to push the export info into
1725 * the kernel.
1726 */
1727int
1728do_mount(ep, grp, exflags, anoncrp, dirp, dirplen, fsb)
1729	struct exportlist *ep;
1730	struct grouplist *grp;
1731	int exflags;
1732	struct xucred *anoncrp;
1733	char *dirp;
1734	int dirplen;
1735	struct statfs *fsb;
1736{
1737	struct statfs fsb1;
1738	struct addrinfo *ai;
1739	struct export_args *eap;
1740	char *cp = NULL;
1741	int done;
1742	char savedc = '\0';
1743	union {
1744		struct ufs_args ua;
1745		struct iso_args ia;
1746		struct mfs_args ma;
1747		struct msdosfs_args da;
1748		struct ntfs_args na;
1749	} args;
1750
1751	bzero(&args, sizeof args);
1752	/* XXX, we assume that all xx_args look like ufs_args. */
1753	args.ua.fspec = 0;
1754	eap = &args.ua.export;
1755
1756	eap->ex_flags = exflags;
1757	eap->ex_anon = *anoncrp;
1758	eap->ex_indexfile = ep->ex_indexfile;
1759	if (grp->gr_type == GT_HOST)
1760		ai = grp->gr_ptr.gt_addrinfo;
1761	else
1762		ai = NULL;
1763	done = FALSE;
1764	while (!done) {
1765		switch (grp->gr_type) {
1766		case GT_HOST:
1767			if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0)
1768				goto skip;
1769			eap->ex_addr = ai->ai_addr;
1770			eap->ex_addrlen = ai->ai_addrlen;
1771			eap->ex_masklen = 0;
1772			break;
1773		case GT_NET:
1774			if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 &&
1775			    have_v6 == 0)
1776				goto skip;
1777			eap->ex_addr =
1778			    (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net;
1779			eap->ex_addrlen = args.ua.export.ex_addr->sa_len;
1780			eap->ex_mask =
1781			    (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask;
1782			eap->ex_masklen = args.ua.export.ex_mask->sa_len;
1783			break;
1784		case GT_DEFAULT:
1785			eap->ex_addr = NULL;
1786			eap->ex_addrlen = 0;
1787			eap->ex_mask = NULL;
1788			eap->ex_masklen = 0;
1789			break;
1790		case GT_IGNORE:
1791			return(0);
1792			break;
1793		default:
1794			syslog(LOG_ERR, "bad grouptype");
1795			if (cp)
1796				*cp = savedc;
1797			return (1);
1798		};
1799
1800		/*
1801		 * XXX:
1802		 * Maybe I should just use the fsb->f_mntonname path instead
1803		 * of looping back up the dirp to the mount point??
1804		 * Also, needs to know how to export all types of local
1805		 * exportable file systems and not just "ufs".
1806		 */
1807		while (mount(fsb->f_fstypename, dirp,
1808		    fsb->f_flags | MNT_UPDATE, (caddr_t)&args) < 0) {
1809			if (cp)
1810				*cp-- = savedc;
1811			else
1812				cp = dirp + dirplen - 1;
1813			if (errno == EPERM) {
1814				if (debug)
1815					warnx("can't change attributes for %s",
1816					    dirp);
1817				syslog(LOG_ERR,
1818				   "can't change attributes for %s", dirp);
1819				return (1);
1820			}
1821			if (opt_flags & OP_ALLDIRS) {
1822				syslog(LOG_ERR, "could not remount %s: %m",
1823					dirp);
1824				return (1);
1825			}
1826			/* back up over the last component */
1827			while (*cp == '/' && cp > dirp)
1828				cp--;
1829			while (*(cp - 1) != '/' && cp > dirp)
1830				cp--;
1831			if (cp == dirp) {
1832				if (debug)
1833					warnx("mnt unsucc");
1834				syslog(LOG_ERR, "can't export %s", dirp);
1835				return (1);
1836			}
1837			savedc = *cp;
1838			*cp = '\0';
1839			/* Check that we're still on the same filesystem. */
1840			if (statfs(dirp, &fsb1) != 0 || bcmp(&fsb1.f_fsid,
1841			    &fsb->f_fsid, sizeof(fsb1.f_fsid)) != 0) {
1842				*cp = savedc;
1843				syslog(LOG_ERR, "can't export %s", dirp);
1844				return (1);
1845			}
1846		}
1847skip:
1848		if (ai != NULL)
1849			ai = ai->ai_next;
1850		if (ai == NULL)
1851			done = TRUE;
1852	}
1853	if (cp)
1854		*cp = savedc;
1855	return (0);
1856}
1857
1858/*
1859 * Translate a net address.
1860 *
1861 * If `maskflg' is nonzero, then `cp' is a netmask, not a network address.
1862 */
1863int
1864get_net(cp, net, maskflg)
1865	char *cp;
1866	struct netmsk *net;
1867	int maskflg;
1868{
1869	struct netent *np = NULL;
1870	char *name, *p, *prefp;
1871	struct sockaddr_in sin;
1872	struct sockaddr *sa = NULL;
1873	struct addrinfo hints, *ai = NULL;
1874	char netname[NI_MAXHOST];
1875	long preflen;
1876
1877	p = prefp = NULL;
1878	if ((opt_flags & OP_MASKLEN) && !maskflg) {
1879		p = strchr(cp, '/');
1880		*p = '\0';
1881		prefp = p + 1;
1882	}
1883
1884	/*
1885	 * Check for a numeric address first. We wish to avoid
1886	 * possible DNS lookups in getnetbyname().
1887	 */
1888	if (isxdigit(*cp) || *cp == ':') {
1889		memset(&hints, 0, sizeof hints);
1890		/* Ensure the mask and the network have the same family. */
1891		if (maskflg && (opt_flags & OP_NET))
1892			hints.ai_family = net->nt_net.ss_family;
1893		else if (!maskflg && (opt_flags & OP_HAVEMASK))
1894			hints.ai_family = net->nt_mask.ss_family;
1895		else
1896			hints.ai_family = AF_UNSPEC;
1897		hints.ai_flags = AI_NUMERICHOST;
1898		if (getaddrinfo(cp, NULL, &hints, &ai) == 0)
1899			sa = ai->ai_addr;
1900		if (sa != NULL && ai->ai_family == AF_INET) {
1901			/*
1902			 * The address in `cp' is really a network address, so
1903			 * use inet_network() to re-interpret this correctly.
1904			 * e.g. "127.1" means 127.1.0.0, not 127.0.0.1.
1905			 */
1906			bzero(&sin, sizeof sin);
1907			sin.sin_family = AF_INET;
1908			sin.sin_len = sizeof sin;
1909			sin.sin_addr = inet_makeaddr(inet_network(cp), 0);
1910			if (debug)
1911				fprintf(stderr, "get_net: v4 addr %s\n",
1912				    inet_ntoa(sin.sin_addr));
1913			sa = (struct sockaddr *)&sin;
1914		}
1915	}
1916	if (sa == NULL && (np = getnetbyname(cp)) != NULL) {
1917		bzero(&sin, sizeof sin);
1918		sin.sin_family = AF_INET;
1919		sin.sin_len = sizeof sin;
1920		sin.sin_addr = inet_makeaddr(np->n_net, 0);
1921		sa = (struct sockaddr *)&sin;
1922	}
1923	if (sa == NULL)
1924		goto fail;
1925
1926	if (maskflg) {
1927		/* The specified sockaddr is a mask. */
1928		if (checkmask(sa) != 0)
1929			goto fail;
1930		bcopy(sa, &net->nt_mask, sa->sa_len);
1931		opt_flags |= OP_HAVEMASK;
1932	} else {
1933		/* The specified sockaddr is a network address. */
1934		bcopy(sa, &net->nt_net, sa->sa_len);
1935
1936		/* Get a network name for the export list. */
1937		if (np) {
1938			name = np->n_name;
1939		} else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname,
1940		   NULL, 0, ninumeric) == 0) {
1941			name = netname;
1942		} else {
1943			goto fail;
1944		}
1945		if ((net->nt_name = strdup(name)) == NULL)
1946			out_of_mem();
1947
1948		/*
1949		 * Extract a mask from either a "/<masklen>" suffix, or
1950		 * from the class of an IPv4 address.
1951		 */
1952		if (opt_flags & OP_MASKLEN) {
1953			preflen = strtol(prefp, NULL, 10);
1954			if (preflen < 0L || preflen == LONG_MAX)
1955				goto fail;
1956			bcopy(sa, &net->nt_mask, sa->sa_len);
1957			if (makemask(&net->nt_mask, (int)preflen) != 0)
1958				goto fail;
1959			opt_flags |= OP_HAVEMASK;
1960			*p = '/';
1961		} else if (sa->sa_family == AF_INET &&
1962		    (opt_flags & OP_MASK) == 0) {
1963			in_addr_t addr;
1964
1965			addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
1966			if (IN_CLASSA(addr))
1967				preflen = 8;
1968			else if (IN_CLASSB(addr))
1969				preflen = 16;
1970			else if (IN_CLASSC(addr))
1971				preflen = 24;
1972			else if (IN_CLASSD(addr))
1973				preflen = 28;
1974			else
1975				preflen = 32;	/* XXX */
1976
1977			bcopy(sa, &net->nt_mask, sa->sa_len);
1978			makemask(&net->nt_mask, (int)preflen);
1979			opt_flags |= OP_HAVEMASK;
1980		}
1981	}
1982
1983	if (ai)
1984		freeaddrinfo(ai);
1985	return 0;
1986
1987fail:
1988	if (ai)
1989		freeaddrinfo(ai);
1990	return 1;
1991}
1992
1993/*
1994 * Parse out the next white space separated field
1995 */
1996void
1997nextfield(cp, endcp)
1998	char **cp;
1999	char **endcp;
2000{
2001	char *p;
2002
2003	p = *cp;
2004	while (*p == ' ' || *p == '\t')
2005		p++;
2006	if (*p == '\n' || *p == '\0')
2007		*cp = *endcp = p;
2008	else {
2009		*cp = p++;
2010		while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
2011			p++;
2012		*endcp = p;
2013	}
2014}
2015
2016/*
2017 * Get an exports file line. Skip over blank lines and handle line
2018 * continuations.
2019 */
2020int
2021get_line()
2022{
2023	char *p, *cp;
2024	int len;
2025	int totlen, cont_line;
2026
2027	/*
2028	 * Loop around ignoring blank lines and getting all continuation lines.
2029	 */
2030	p = line;
2031	totlen = 0;
2032	do {
2033		if (fgets(p, LINESIZ - totlen, exp_file) == NULL)
2034			return (0);
2035		len = strlen(p);
2036		cp = p + len - 1;
2037		cont_line = 0;
2038		while (cp >= p &&
2039		    (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) {
2040			if (*cp == '\\')
2041				cont_line = 1;
2042			cp--;
2043			len--;
2044		}
2045		*++cp = '\0';
2046		if (len > 0) {
2047			totlen += len;
2048			if (totlen >= LINESIZ) {
2049				syslog(LOG_ERR, "exports line too long");
2050				exit(2);
2051			}
2052			p = cp;
2053		}
2054	} while (totlen == 0 || cont_line);
2055	return (1);
2056}
2057
2058/*
2059 * Parse a description of a credential.
2060 */
2061void
2062parsecred(namelist, cr)
2063	char *namelist;
2064	struct xucred *cr;
2065{
2066	char *name;
2067	int cnt;
2068	char *names;
2069	struct passwd *pw;
2070	struct group *gr;
2071	int ngroups, groups[NGROUPS + 1];
2072
2073	/*
2074	 * Set up the unprivileged user.
2075	 */
2076	cr->cr_uid = -2;
2077	cr->cr_groups[0] = -2;
2078	cr->cr_ngroups = 1;
2079	/*
2080	 * Get the user's password table entry.
2081	 */
2082	names = strsep(&namelist, " \t\n");
2083	name = strsep(&names, ":");
2084	if (isdigit(*name) || *name == '-')
2085		pw = getpwuid(atoi(name));
2086	else
2087		pw = getpwnam(name);
2088	/*
2089	 * Credentials specified as those of a user.
2090	 */
2091	if (names == NULL) {
2092		if (pw == NULL) {
2093			syslog(LOG_ERR, "unknown user: %s", name);
2094			return;
2095		}
2096		cr->cr_uid = pw->pw_uid;
2097		ngroups = NGROUPS + 1;
2098		if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups))
2099			syslog(LOG_ERR, "too many groups");
2100		/*
2101		 * Convert from int's to gid_t's and compress out duplicate
2102		 */
2103		cr->cr_ngroups = ngroups - 1;
2104		cr->cr_groups[0] = groups[0];
2105		for (cnt = 2; cnt < ngroups; cnt++)
2106			cr->cr_groups[cnt - 1] = groups[cnt];
2107		return;
2108	}
2109	/*
2110	 * Explicit credential specified as a colon separated list:
2111	 *	uid:gid:gid:...
2112	 */
2113	if (pw != NULL)
2114		cr->cr_uid = pw->pw_uid;
2115	else if (isdigit(*name) || *name == '-')
2116		cr->cr_uid = atoi(name);
2117	else {
2118		syslog(LOG_ERR, "unknown user: %s", name);
2119		return;
2120	}
2121	cr->cr_ngroups = 0;
2122	while (names != NULL && *names != '\0' && cr->cr_ngroups < NGROUPS) {
2123		name = strsep(&names, ":");
2124		if (isdigit(*name) || *name == '-') {
2125			cr->cr_groups[cr->cr_ngroups++] = atoi(name);
2126		} else {
2127			if ((gr = getgrnam(name)) == NULL) {
2128				syslog(LOG_ERR, "unknown group: %s", name);
2129				continue;
2130			}
2131			cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid;
2132		}
2133	}
2134	if (names != NULL && *names != '\0' && cr->cr_ngroups == NGROUPS)
2135		syslog(LOG_ERR, "too many groups");
2136}
2137
2138#define	STRSIZ	(RPCMNT_NAMELEN+RPCMNT_PATHLEN+50)
2139/*
2140 * Routines that maintain the remote mounttab
2141 */
2142void
2143get_mountlist()
2144{
2145	struct mountlist *mlp, **mlpp;
2146	char *host, *dirp, *cp;
2147	char str[STRSIZ];
2148	FILE *mlfile;
2149
2150	if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) {
2151		if (errno == ENOENT)
2152			return;
2153		else {
2154			syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST);
2155			return;
2156		}
2157	}
2158	mlpp = &mlhead;
2159	while (fgets(str, STRSIZ, mlfile) != NULL) {
2160		cp = str;
2161		host = strsep(&cp, " \t\n");
2162		dirp = strsep(&cp, " \t\n");
2163		if (host == NULL || dirp == NULL)
2164			continue;
2165		mlp = (struct mountlist *)malloc(sizeof (*mlp));
2166		if (mlp == (struct mountlist *)NULL)
2167			out_of_mem();
2168		strncpy(mlp->ml_host, host, RPCMNT_NAMELEN);
2169		mlp->ml_host[RPCMNT_NAMELEN] = '\0';
2170		strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN);
2171		mlp->ml_dirp[RPCMNT_PATHLEN] = '\0';
2172		mlp->ml_next = (struct mountlist *)NULL;
2173		*mlpp = mlp;
2174		mlpp = &mlp->ml_next;
2175	}
2176	fclose(mlfile);
2177}
2178
2179void
2180del_mlist(char *hostp, char *dirp)
2181{
2182	struct mountlist *mlp, **mlpp;
2183	struct mountlist *mlp2;
2184	FILE *mlfile;
2185	int fnd = 0;
2186
2187	mlpp = &mlhead;
2188	mlp = mlhead;
2189	while (mlp) {
2190		if (!strcmp(mlp->ml_host, hostp) &&
2191		    (!dirp || !strcmp(mlp->ml_dirp, dirp))) {
2192			fnd = 1;
2193			mlp2 = mlp;
2194			*mlpp = mlp = mlp->ml_next;
2195			free((caddr_t)mlp2);
2196		} else {
2197			mlpp = &mlp->ml_next;
2198			mlp = mlp->ml_next;
2199		}
2200	}
2201	if (fnd) {
2202		if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) {
2203			syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST);
2204			return;
2205		}
2206		mlp = mlhead;
2207		while (mlp) {
2208			fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
2209			mlp = mlp->ml_next;
2210		}
2211		fclose(mlfile);
2212	}
2213}
2214
2215void
2216add_mlist(hostp, dirp)
2217	char *hostp, *dirp;
2218{
2219	struct mountlist *mlp, **mlpp;
2220	FILE *mlfile;
2221
2222	mlpp = &mlhead;
2223	mlp = mlhead;
2224	while (mlp) {
2225		if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp))
2226			return;
2227		mlpp = &mlp->ml_next;
2228		mlp = mlp->ml_next;
2229	}
2230	mlp = (struct mountlist *)malloc(sizeof (*mlp));
2231	if (mlp == (struct mountlist *)NULL)
2232		out_of_mem();
2233	strncpy(mlp->ml_host, hostp, RPCMNT_NAMELEN);
2234	mlp->ml_host[RPCMNT_NAMELEN] = '\0';
2235	strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN);
2236	mlp->ml_dirp[RPCMNT_PATHLEN] = '\0';
2237	mlp->ml_next = (struct mountlist *)NULL;
2238	*mlpp = mlp;
2239	if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
2240		syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST);
2241		return;
2242	}
2243	fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
2244	fclose(mlfile);
2245}
2246
2247/*
2248 * Free up a group list.
2249 */
2250void
2251free_grp(grp)
2252	struct grouplist *grp;
2253{
2254	if (grp->gr_type == GT_HOST) {
2255		if (grp->gr_ptr.gt_addrinfo != NULL)
2256			freeaddrinfo(grp->gr_ptr.gt_addrinfo);
2257	} else if (grp->gr_type == GT_NET) {
2258		if (grp->gr_ptr.gt_net.nt_name)
2259			free(grp->gr_ptr.gt_net.nt_name);
2260	}
2261	free((caddr_t)grp);
2262}
2263
2264#ifdef DEBUG
2265void
2266SYSLOG(int pri, const char *fmt, ...)
2267{
2268	va_list ap;
2269
2270	va_start(ap, fmt);
2271	vfprintf(stderr, fmt, ap);
2272	va_end(ap);
2273}
2274#endif /* DEBUG */
2275
2276/*
2277 * Check options for consistency.
2278 */
2279int
2280check_options(dp)
2281	struct dirlist *dp;
2282{
2283
2284	if (dp == (struct dirlist *)NULL)
2285	    return (1);
2286	if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL) ||
2287	    (opt_flags & (OP_MAPROOT | OP_KERB)) == (OP_MAPROOT | OP_KERB) ||
2288	    (opt_flags & (OP_MAPALL | OP_KERB)) == (OP_MAPALL | OP_KERB)) {
2289	    syslog(LOG_ERR, "-mapall, -maproot and -kerb mutually exclusive");
2290	    return (1);
2291	}
2292	if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) {
2293		syslog(LOG_ERR, "-mask requires -network");
2294		return (1);
2295	}
2296	if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) {
2297		syslog(LOG_ERR, "-network requires mask specification");
2298		return (1);
2299	}
2300	if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) {
2301		syslog(LOG_ERR, "-mask and /masklen are mutually exclusive");
2302		return (1);
2303	}
2304	if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
2305	    syslog(LOG_ERR, "-alldirs has multiple directories");
2306	    return (1);
2307	}
2308	return (0);
2309}
2310
2311/*
2312 * Check an absolute directory path for any symbolic links. Return true
2313 */
2314int
2315check_dirpath(dirp)
2316	char *dirp;
2317{
2318	char *cp;
2319	int ret = 1;
2320	struct stat sb;
2321
2322	cp = dirp + 1;
2323	while (*cp && ret) {
2324		if (*cp == '/') {
2325			*cp = '\0';
2326			if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
2327				ret = 0;
2328			*cp = '/';
2329		}
2330		cp++;
2331	}
2332	if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
2333		ret = 0;
2334	return (ret);
2335}
2336
2337/*
2338 * Make a netmask according to the specified prefix length. The ss_family
2339 * and other non-address fields must be initialised before calling this.
2340 */
2341int
2342makemask(struct sockaddr_storage *ssp, int bitlen)
2343{
2344	u_char *p;
2345	int bits, i, len;
2346
2347	if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL)
2348		return (-1);
2349	if (bitlen > len * NBBY)
2350		return (-1);
2351
2352	for (i = 0; i < len; i++) {
2353		bits = (bitlen > NBBY) ? NBBY : bitlen;
2354		*p++ = (1 << bits) - 1;
2355		bitlen -= bits;
2356	}
2357	return 0;
2358}
2359
2360/*
2361 * Check that the sockaddr is a valid netmask. Returns 0 if the mask
2362 * is acceptable (i.e. of the form 1...10....0).
2363 */
2364int
2365checkmask(struct sockaddr *sa)
2366{
2367	u_char *mask;
2368	int i, len;
2369
2370	if ((mask = sa_rawaddr(sa, &len)) == NULL)
2371		return (-1);
2372
2373	for (i = 0; i < len; i++)
2374		if (mask[i] != 0xff)
2375			break;
2376	if (i < len) {
2377		if (~mask[i] & (u_char)(~mask[i] + 1))
2378			return (-1);
2379		i++;
2380	}
2381	for (; i < len; i++)
2382		if (mask[i] != 0)
2383			return (-1);
2384	return (0);
2385}
2386
2387/*
2388 * Compare two sockaddrs according to a specified mask. Return zero if
2389 * `sa1' matches `sa2' when filtered by the netmask in `samask'.
2390 * If samask is NULL, perform a full comparision.
2391 */
2392int
2393sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask)
2394{
2395	unsigned char *p1, *p2, *mask;
2396	int len, i;
2397
2398	if (sa1->sa_family != sa2->sa_family ||
2399	    (p1 = sa_rawaddr(sa1, &len)) == NULL ||
2400	    (p2 = sa_rawaddr(sa2, NULL)) == NULL)
2401		return (1);
2402
2403	switch (sa1->sa_family) {
2404	case AF_INET6:
2405		if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
2406		    ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
2407			return (1);
2408		break;
2409	}
2410
2411	/* Simple binary comparison if no mask specified. */
2412	if (samask == NULL)
2413		return (memcmp(p1, p2, len));
2414
2415	/* Set up the mask, and do a mask-based comparison. */
2416	if (sa1->sa_family != samask->sa_family ||
2417	    (mask = sa_rawaddr(samask, NULL)) == NULL)
2418		return (1);
2419
2420	for (i = 0; i < len; i++)
2421		if ((p1[i] & mask[i]) != (p2[i] & mask[i]))
2422			return (1);
2423	return (0);
2424}
2425
2426/*
2427 * Return a pointer to the part of the sockaddr that contains the
2428 * raw address, and set *nbytes to its length in bytes. Returns
2429 * NULL if the address family is unknown.
2430 */
2431void *
2432sa_rawaddr(struct sockaddr *sa, int *nbytes) {
2433	void *p;
2434	int len;
2435
2436	switch (sa->sa_family) {
2437	case AF_INET:
2438		len = sizeof(((struct sockaddr_in *)sa)->sin_addr);
2439		p = &((struct sockaddr_in *)sa)->sin_addr;
2440		break;
2441	case AF_INET6:
2442		len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr);
2443		p = &((struct sockaddr_in6 *)sa)->sin6_addr;
2444		break;
2445	default:
2446		p = NULL;
2447		len = 0;
2448	}
2449
2450	if (nbytes != NULL)
2451		*nbytes = len;
2452	return (p);
2453}
2454
2455void
2456huphandler(int sig)
2457{
2458	got_sighup = 1;
2459}
2460
2461void terminate(sig)
2462int sig;
2463{
2464	close(mountdlockfd);
2465	unlink(MOUNTDLOCK);
2466	rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL);
2467	rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL);
2468	exit (0);
2469}
2470