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#include <sys/types.h>
36#include <sys/queue.h>
37#include <sys/file.h>
38#include <sys/socket.h>
39#include <sys/socketvar.h>
40
41#include <err.h>
42#include <getopt.h>
43#include <netdb.h>
44#include <rpc/rpc.h>
45#include <rpc/pmap_clnt.h>
46#include <rpc/pmap_prot.h>
47#include <rpcsvc/mount.h>
48
49#include <stdio.h>
50#include <stdlib.h>
51#include <string.h>
52#include <unistd.h>
53#include <vis.h>
54
55/* Constant defs */
56#define	ALL	1
57#define	DIRS	2
58
59#define	DODUMP			0x1
60#define	DOEXPORTS		0x2
61#define	DOPARSABLEEXPORTS	0x4
62
63struct mountlist {
64	struct mountlist *ml_left;
65	struct mountlist *ml_right;
66	char	ml_host[MNTNAMLEN+1];
67	char	ml_dirp[MNTPATHLEN+1];
68};
69
70struct grouplist {
71	struct grouplist *gr_next;
72	char	gr_name[MNTNAMLEN+1];
73};
74
75struct exportslist {
76	struct exportslist *ex_next;
77	struct grouplist *ex_groups;
78	char	ex_dirp[MNTPATHLEN+1];
79};
80
81static struct mountlist *mntdump;
82static struct exportslist *exportslist;
83static int type = 0;
84
85void print_dump(struct mountlist *);
86static void usage(void) __dead2;
87int xdr_mntdump(XDR *, struct mountlist **);
88int xdr_exportslist(XDR *, struct exportslist **);
89int tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
90		xdrproc_t inproc, char *in, xdrproc_t outproc, char *out);
91
92static const struct option long_opts[] = {
93	{ "all",			no_argument,	NULL,	'a' },
94	{ "directories",	no_argument,	NULL,	'd' },
95	{ "exports-script",	no_argument,	NULL,	'E' },
96	{ "exports",		no_argument,	NULL,	'e' },
97	{ NULL,				0,				NULL,	0 },
98};
99
100/*
101 * This command queries the NFS mount daemon for it's mount list and/or
102 * it's exports list and prints them out.
103 * See "NFS: Network File System Protocol Specification, RFC1094, Appendix A"
104 * and the "Network File System Protocol XXX.."
105 * for detailed information on the protocol.
106 */
107int
108main(int argc, char **argv)
109{
110	char strvised[MNTPATHLEN * 4 + 1];
111	register struct exportslist *exp;
112	register struct grouplist *grp;
113	register int rpcs = 0, mntvers = 3;
114	const char *host;
115	int ch, estat, nbytes;
116
117	while ((ch = getopt_long(argc, argv, "+adEe13", long_opts, NULL)) != -1)
118		switch (ch) {
119		case 'a':
120			if (type == 0) {
121				type = ALL;
122				rpcs |= DODUMP;
123			} else
124				usage();
125			break;
126		case 'd':
127			if (type == 0) {
128				type = DIRS;
129				rpcs |= DODUMP;
130			} else
131				usage();
132			break;
133		case 'E':
134			rpcs |= DOPARSABLEEXPORTS;
135			break;
136		case 'e':
137			rpcs |= DOEXPORTS;
138			break;
139		case '1':
140			mntvers = 1;
141			break;
142		case '3':
143			mntvers = 3;
144			break;
145		case '?':
146		default:
147			usage();
148		}
149	argc -= optind;
150	argv += optind;
151
152	if ((rpcs & DOPARSABLEEXPORTS) != 0) {
153		if ((rpcs & DOEXPORTS) != 0)
154			errx(1, "-E cannot be used with -e");
155		if ((rpcs & DODUMP) != 0)
156			errx(1, "-E cannot be used with -a or -d");
157	}
158
159	if (argc > 0)
160		host = *argv;
161	else
162		host = "localhost";
163
164	if (rpcs == 0)
165		rpcs = DODUMP;
166
167	if (rpcs & DODUMP)
168		if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
169			MOUNTPROC_DUMP, (xdrproc_t)xdr_void, (char *)0,
170			(xdrproc_t)xdr_mntdump, (char *)&mntdump)) != 0) {
171			clnt_perrno(estat);
172			errx(1, "can't do mountdump rpc");
173		}
174	if (rpcs & (DOEXPORTS | DOPARSABLEEXPORTS))
175		if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
176			MOUNTPROC_EXPORT, (xdrproc_t)xdr_void, (char *)0,
177			(xdrproc_t)xdr_exportslist, (char *)&exportslist)) != 0) {
178			clnt_perrno(estat);
179			errx(1, "can't do exports rpc");
180		}
181
182	/* Now just print out the results */
183	if (rpcs & DODUMP) {
184		switch (type) {
185		case ALL:
186			printf("All mount points on %s:\n", host);
187			break;
188		case DIRS:
189			printf("Directories on %s:\n", host);
190			break;
191		default:
192			printf("Hosts on %s:\n", host);
193			break;
194		}
195		print_dump(mntdump);
196	}
197	if (rpcs & DOEXPORTS) {
198		printf("Exports list on %s:\n", host);
199		exp = exportslist;
200		while (exp) {
201			printf("%-34s ", exp->ex_dirp);
202			grp = exp->ex_groups;
203			if (grp == NULL) {
204				printf("Everyone\n");
205			} else {
206				while (grp) {
207					printf("%s ", grp->gr_name);
208					grp = grp->gr_next;
209				}
210				printf("\n");
211			}
212			exp = exp->ex_next;
213		}
214	}
215	if (rpcs & DOPARSABLEEXPORTS) {
216		exp = exportslist;
217		while (exp) {
218			nbytes = strsnvis(strvised, sizeof(strvised),
219			    exp->ex_dirp, VIS_GLOB | VIS_NL, "\"'$");
220			if (nbytes == -1)
221				err(1, "strsnvis");
222			printf("%s\n", strvised);
223			exp = exp->ex_next;
224		}
225	}
226	exit(0);
227}
228
229/*
230 * tcp_callrpc has the same interface as callrpc, but tries to
231 * use tcp as transport method in order to handle large replies.
232 */
233int
234tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
235    xdrproc_t inproc, char *in, xdrproc_t outproc, char *out)
236{
237	CLIENT *client;
238	struct timeval timeout;
239	int rval;
240
241	if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL &&
242	    (client = clnt_create(host, prognum, versnum, "udp")) == NULL)
243		return ((int) rpc_createerr.cf_stat);
244
245	timeout.tv_sec = 25;
246	timeout.tv_usec = 0;
247	rval = (int) clnt_call(client, procnum,
248			       inproc, in,
249			       outproc, out,
250			       timeout);
251	clnt_destroy(client);
252 	return rval;
253}
254
255/*
256 * Xdr routine for retrieving the mount dump list
257 */
258int
259xdr_mntdump(XDR *xdrsp, struct mountlist **mlp)
260{
261	register struct mountlist *mp;
262	register struct mountlist *tp;
263	register struct mountlist **otp;
264	int val, val2;
265	int bool;
266	char *strp;
267
268	*mlp = (struct mountlist *)0;
269	if (!xdr_bool(xdrsp, &bool))
270		return (0);
271	while (bool) {
272		mp = (struct mountlist *)malloc(sizeof(struct mountlist));
273		if (mp == NULL)
274			return (0);
275		mp->ml_left = mp->ml_right = (struct mountlist *)0;
276		strp = mp->ml_host;
277		if (!xdr_string(xdrsp, &strp, MNTNAMLEN)) {
278			free(mp);
279			return (0);
280		}
281		strp = mp->ml_dirp;
282		if (!xdr_string(xdrsp, &strp, MNTPATHLEN)) {
283			free(mp);
284			return (0);
285		}
286
287		/*
288		 * Build a binary tree on sorted order of either host or dirp.
289		 * Drop any duplications.
290		 */
291		if (*mlp == NULL) {
292			*mlp = mp;
293		} else {
294			tp = *mlp;
295			while (tp) {
296				val = strcmp(mp->ml_host, tp->ml_host);
297				val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
298				switch (type) {
299				case ALL:
300					if (val == 0) {
301						if (val2 == 0) {
302							free((caddr_t)mp);
303							goto next;
304						}
305						val = val2;
306					}
307					break;
308				case DIRS:
309					if (val2 == 0) {
310						free((caddr_t)mp);
311						goto next;
312					}
313					val = val2;
314					break;
315				default:
316					if (val == 0) {
317						free((caddr_t)mp);
318						goto next;
319					}
320					break;
321				}
322				if (val < 0) {
323					otp = &tp->ml_left;
324					tp = tp->ml_left;
325				} else {
326					otp = &tp->ml_right;
327					tp = tp->ml_right;
328				}
329			}
330			*otp = mp;
331		}
332next:
333		if (!xdr_bool(xdrsp, &bool))
334			return (0);
335	}
336	return (1);
337}
338
339/*
340 * Xdr routine to retrieve exports list
341 */
342int
343xdr_exportslist(XDR *xdrsp, struct exportslist **exp)
344{
345	register struct exportslist *ep;
346	register struct grouplist *gp;
347	int bool, grpbool;
348	char *strp;
349
350	*exp = (struct exportslist *)0;
351	if (!xdr_bool(xdrsp, &bool))
352		return (0);
353	while (bool) {
354		ep = (struct exportslist *)malloc(sizeof(struct exportslist));
355		if (ep == NULL)
356			return (0);
357		ep->ex_groups = (struct grouplist *)0;
358		strp = ep->ex_dirp;
359		if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
360			return (0);
361		if (!xdr_bool(xdrsp, &grpbool))
362			return (0);
363		while (grpbool) {
364			gp = (struct grouplist *)malloc(sizeof(struct grouplist));
365			if (gp == NULL)
366				return (0);
367			strp = gp->gr_name;
368			if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
369				return (0);
370			gp->gr_next = ep->ex_groups;
371			ep->ex_groups = gp;
372			if (!xdr_bool(xdrsp, &grpbool))
373				return (0);
374		}
375		ep->ex_next = *exp;
376		*exp = ep;
377		if (!xdr_bool(xdrsp, &bool))
378			return (0);
379	}
380	return (1);
381}
382
383static void
384usage(void)
385{
386	fprintf(stderr, "usage: showmount [-a | -d] [-e3] [host]\n");
387	exit(1);
388}
389
390/*
391 * Print the binary tree in inorder so that output is sorted.
392 */
393void
394print_dump(struct mountlist *mp)
395{
396
397	if (mp == NULL)
398		return;
399	if (mp->ml_left)
400		print_dump(mp->ml_left);
401	switch (type) {
402	case ALL:
403		printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
404		break;
405	case DIRS:
406		printf("%s\n", mp->ml_dirp);
407		break;
408	default:
409		printf("%s\n", mp->ml_host);
410		break;
411	}
412	if (mp->ml_right)
413		print_dump(mp->ml_right);
414}
415