1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993, 1995
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Rick Macklem at The University of Guelph.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#ifndef lint
36static const char copyright[] =
37"@(#) Copyright (c) 1989, 1993, 1995\n\
38	The Regents of the University of California.  All rights reserved.\n";
39#endif /* not lint */
40
41#ifndef lint
42#if 0
43static char sccsid[] = "@(#)showmount.c	8.3 (Berkeley) 3/29/95";
44#endif
45static const char rcsid[] =
46  "$FreeBSD$";
47#endif /* not lint */
48
49#include <sys/types.h>
50#include <sys/queue.h>
51#include <sys/file.h>
52#include <sys/socket.h>
53#include <sys/socketvar.h>
54
55#include <err.h>
56#include <getopt.h>
57#include <netdb.h>
58#include <rpc/rpc.h>
59#include <rpc/pmap_clnt.h>
60#include <rpc/pmap_prot.h>
61#include <rpcsvc/mount.h>
62
63#include <stdio.h>
64#include <stdlib.h>
65#include <string.h>
66#include <unistd.h>
67#include <vis.h>
68
69/* Constant defs */
70#define	ALL	1
71#define	DIRS	2
72
73#define	DODUMP			0x1
74#define	DOEXPORTS		0x2
75#define	DOPARSABLEEXPORTS	0x4
76
77struct mountlist {
78	struct mountlist *ml_left;
79	struct mountlist *ml_right;
80	char	ml_host[MNTNAMLEN+1];
81	char	ml_dirp[MNTPATHLEN+1];
82};
83
84struct grouplist {
85	struct grouplist *gr_next;
86	char	gr_name[MNTNAMLEN+1];
87};
88
89struct exportslist {
90	struct exportslist *ex_next;
91	struct grouplist *ex_groups;
92	char	ex_dirp[MNTPATHLEN+1];
93};
94
95static struct mountlist *mntdump;
96static struct exportslist *exportslist;
97static int type = 0;
98
99void print_dump(struct mountlist *);
100static void usage(void);
101int xdr_mntdump(XDR *, struct mountlist **);
102int xdr_exportslist(XDR *, struct exportslist **);
103int tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
104		xdrproc_t inproc, char *in, xdrproc_t outproc, char *out);
105
106static const struct option long_opts[] = {
107	{ "all",			no_argument,	NULL,	'a' },
108	{ "directories",	no_argument,	NULL,	'd' },
109	{ "exports-script",	no_argument,	NULL,	'E' },
110	{ "exports",		no_argument,	NULL,	'e' },
111	{ NULL,				0,				NULL,	0 },
112};
113
114/*
115 * This command queries the NFS mount daemon for it's mount list and/or
116 * it's exports list and prints them out.
117 * See "NFS: Network File System Protocol Specification, RFC1094, Appendix A"
118 * and the "Network File System Protocol XXX.."
119 * for detailed information on the protocol.
120 */
121int
122main(int argc, char **argv)
123{
124	char strvised[MNTPATHLEN * 4 + 1];
125	register struct exportslist *exp;
126	register struct grouplist *grp;
127	register int rpcs = 0, mntvers = 3;
128	const char *host;
129	int ch, estat, nbytes;
130
131	while ((ch = getopt_long(argc, argv, "+adEe13", long_opts, NULL)) != -1)
132		switch (ch) {
133		case 'a':
134			if (type == 0) {
135				type = ALL;
136				rpcs |= DODUMP;
137			} else
138				usage();
139			break;
140		case 'd':
141			if (type == 0) {
142				type = DIRS;
143				rpcs |= DODUMP;
144			} else
145				usage();
146			break;
147		case 'E':
148			rpcs |= DOPARSABLEEXPORTS;
149			break;
150		case 'e':
151			rpcs |= DOEXPORTS;
152			break;
153		case '1':
154			mntvers = 1;
155			break;
156		case '3':
157			mntvers = 3;
158			break;
159		case '?':
160		default:
161			usage();
162		}
163	argc -= optind;
164	argv += optind;
165
166	if ((rpcs & DOPARSABLEEXPORTS) != 0) {
167		if ((rpcs & DOEXPORTS) != 0)
168			errx(1, "-E cannot be used with -e");
169		if ((rpcs & DODUMP) != 0)
170			errx(1, "-E cannot be used with -a or -d");
171	}
172
173	if (argc > 0)
174		host = *argv;
175	else
176		host = "localhost";
177
178	if (rpcs == 0)
179		rpcs = DODUMP;
180
181	if (rpcs & DODUMP)
182		if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
183			MOUNTPROC_DUMP, (xdrproc_t)xdr_void, (char *)0,
184			(xdrproc_t)xdr_mntdump, (char *)&mntdump)) != 0) {
185			clnt_perrno(estat);
186			errx(1, "can't do mountdump rpc");
187		}
188	if (rpcs & (DOEXPORTS | DOPARSABLEEXPORTS))
189		if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
190			MOUNTPROC_EXPORT, (xdrproc_t)xdr_void, (char *)0,
191			(xdrproc_t)xdr_exportslist, (char *)&exportslist)) != 0) {
192			clnt_perrno(estat);
193			errx(1, "can't do exports rpc");
194		}
195
196	/* Now just print out the results */
197	if (rpcs & DODUMP) {
198		switch (type) {
199		case ALL:
200			printf("All mount points on %s:\n", host);
201			break;
202		case DIRS:
203			printf("Directories on %s:\n", host);
204			break;
205		default:
206			printf("Hosts on %s:\n", host);
207			break;
208		}
209		print_dump(mntdump);
210	}
211	if (rpcs & DOEXPORTS) {
212		printf("Exports list on %s:\n", host);
213		exp = exportslist;
214		while (exp) {
215			printf("%-34s ", exp->ex_dirp);
216			grp = exp->ex_groups;
217			if (grp == NULL) {
218				printf("Everyone\n");
219			} else {
220				while (grp) {
221					printf("%s ", grp->gr_name);
222					grp = grp->gr_next;
223				}
224				printf("\n");
225			}
226			exp = exp->ex_next;
227		}
228	}
229	if (rpcs & DOPARSABLEEXPORTS) {
230		exp = exportslist;
231		while (exp) {
232			nbytes = strsnvis(strvised, sizeof(strvised),
233			    exp->ex_dirp, VIS_GLOB | VIS_NL, "\"'$");
234			if (nbytes == -1)
235				err(1, "strsnvis");
236			printf("%s\n", strvised);
237			exp = exp->ex_next;
238		}
239	}
240	exit(0);
241}
242
243/*
244 * tcp_callrpc has the same interface as callrpc, but tries to
245 * use tcp as transport method in order to handle large replies.
246 */
247int
248tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
249    xdrproc_t inproc, char *in, xdrproc_t outproc, char *out)
250{
251	CLIENT *client;
252	struct timeval timeout;
253	int rval;
254
255	if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL &&
256	    (client = clnt_create(host, prognum, versnum, "udp")) == NULL)
257		return ((int) rpc_createerr.cf_stat);
258
259	timeout.tv_sec = 25;
260	timeout.tv_usec = 0;
261	rval = (int) clnt_call(client, procnum,
262			       inproc, in,
263			       outproc, out,
264			       timeout);
265	clnt_destroy(client);
266 	return rval;
267}
268
269/*
270 * Xdr routine for retrieving the mount dump list
271 */
272int
273xdr_mntdump(XDR *xdrsp, struct mountlist **mlp)
274{
275	register struct mountlist *mp;
276	register struct mountlist *tp;
277	register struct mountlist **otp;
278	int val, val2;
279	int bool;
280	char *strp;
281
282	*mlp = (struct mountlist *)0;
283	if (!xdr_bool(xdrsp, &bool))
284		return (0);
285	while (bool) {
286		mp = (struct mountlist *)malloc(sizeof(struct mountlist));
287		if (mp == NULL)
288			return (0);
289		mp->ml_left = mp->ml_right = (struct mountlist *)0;
290		strp = mp->ml_host;
291		if (!xdr_string(xdrsp, &strp, MNTNAMLEN)) {
292			free(mp);
293			return (0);
294		}
295		strp = mp->ml_dirp;
296		if (!xdr_string(xdrsp, &strp, MNTPATHLEN)) {
297			free(mp);
298			return (0);
299		}
300
301		/*
302		 * Build a binary tree on sorted order of either host or dirp.
303		 * Drop any duplications.
304		 */
305		if (*mlp == NULL) {
306			*mlp = mp;
307		} else {
308			tp = *mlp;
309			while (tp) {
310				val = strcmp(mp->ml_host, tp->ml_host);
311				val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
312				switch (type) {
313				case ALL:
314					if (val == 0) {
315						if (val2 == 0) {
316							free((caddr_t)mp);
317							goto next;
318						}
319						val = val2;
320					}
321					break;
322				case DIRS:
323					if (val2 == 0) {
324						free((caddr_t)mp);
325						goto next;
326					}
327					val = val2;
328					break;
329				default:
330					if (val == 0) {
331						free((caddr_t)mp);
332						goto next;
333					}
334					break;
335				}
336				if (val < 0) {
337					otp = &tp->ml_left;
338					tp = tp->ml_left;
339				} else {
340					otp = &tp->ml_right;
341					tp = tp->ml_right;
342				}
343			}
344			*otp = mp;
345		}
346next:
347		if (!xdr_bool(xdrsp, &bool))
348			return (0);
349	}
350	return (1);
351}
352
353/*
354 * Xdr routine to retrieve exports list
355 */
356int
357xdr_exportslist(XDR *xdrsp, struct exportslist **exp)
358{
359	register struct exportslist *ep;
360	register struct grouplist *gp;
361	int bool, grpbool;
362	char *strp;
363
364	*exp = (struct exportslist *)0;
365	if (!xdr_bool(xdrsp, &bool))
366		return (0);
367	while (bool) {
368		ep = (struct exportslist *)malloc(sizeof(struct exportslist));
369		if (ep == NULL)
370			return (0);
371		ep->ex_groups = (struct grouplist *)0;
372		strp = ep->ex_dirp;
373		if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
374			return (0);
375		if (!xdr_bool(xdrsp, &grpbool))
376			return (0);
377		while (grpbool) {
378			gp = (struct grouplist *)malloc(sizeof(struct grouplist));
379			if (gp == NULL)
380				return (0);
381			strp = gp->gr_name;
382			if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
383				return (0);
384			gp->gr_next = ep->ex_groups;
385			ep->ex_groups = gp;
386			if (!xdr_bool(xdrsp, &grpbool))
387				return (0);
388		}
389		ep->ex_next = *exp;
390		*exp = ep;
391		if (!xdr_bool(xdrsp, &bool))
392			return (0);
393	}
394	return (1);
395}
396
397static void
398usage(void)
399{
400	fprintf(stderr, "usage: showmount [-a | -d] [-e3] [host]\n");
401	exit(1);
402}
403
404/*
405 * Print the binary tree in inorder so that output is sorted.
406 */
407void
408print_dump(struct mountlist *mp)
409{
410
411	if (mp == NULL)
412		return;
413	if (mp->ml_left)
414		print_dump(mp->ml_left);
415	switch (type) {
416	case ALL:
417		printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
418		break;
419	case DIRS:
420		printf("%s\n", mp->ml_dirp);
421		break;
422	default:
423		printf("%s\n", mp->ml_host);
424		break;
425	}
426	if (mp->ml_right)
427		print_dump(mp->ml_right);
428}
429