showmount.c revision 222245 
1/*
2 * Copyright (c) 1989, 1993, 1995
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * 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 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#ifndef lint
34static const char copyright[] =
35"@(#) Copyright (c) 1989, 1993, 1995\n\
36	The Regents of the University of California.  All rights reserved.\n";
37#endif /* not lint */
38
39#ifndef lint
40#if 0
41static char sccsid[] = "@(#)showmount.c	8.3 (Berkeley) 3/29/95";
42#endif
43static const char rcsid[] =
44  "$FreeBSD: head/usr.bin/showmount/showmount.c 222245 2011-05-24 06:56:40Z ru $";
45#endif /* not lint */
46
47#include <sys/types.h>
48#include <sys/queue.h>
49#include <sys/file.h>
50#include <sys/socket.h>
51#include <sys/socketvar.h>
52
53#include <err.h>
54#include <netdb.h>
55#include <rpc/rpc.h>
56#include <rpc/pmap_clnt.h>
57#include <rpc/pmap_prot.h>
58#include <rpcsvc/mount.h>
59
60#include <stdio.h>
61#include <stdlib.h>
62#include <string.h>
63#include <unistd.h>
64
65/* Constant defs */
66#define	ALL	1
67#define	DIRS	2
68
69#define	DODUMP		0x1
70#define	DOEXPORTS	0x2
71
72struct mountlist {
73	struct mountlist *ml_left;
74	struct mountlist *ml_right;
75	char	ml_host[MNTNAMLEN+1];
76	char	ml_dirp[MNTPATHLEN+1];
77};
78
79struct grouplist {
80	struct grouplist *gr_next;
81	char	gr_name[MNTNAMLEN+1];
82};
83
84struct exportslist {
85	struct exportslist *ex_next;
86	struct grouplist *ex_groups;
87	char	ex_dirp[MNTPATHLEN+1];
88};
89
90static struct mountlist *mntdump;
91static struct exportslist *exportslist;
92static int type = 0;
93
94void print_dump(struct mountlist *);
95static void usage(void);
96int xdr_mntdump(XDR *, struct mountlist **);
97int xdr_exportslist(XDR *, struct exportslist **);
98int tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
99		xdrproc_t inproc, char *in, xdrproc_t outproc, char *out);
100
101/*
102 * This command queries the NFS mount daemon for it's mount list and/or
103 * it's exports list and prints them out.
104 * See "NFS: Network File System Protocol Specification, RFC1094, Appendix A"
105 * and the "Network File System Protocol XXX.."
106 * for detailed information on the protocol.
107 */
108int
109main(int argc, char **argv)
110{
111	register struct exportslist *exp;
112	register struct grouplist *grp;
113	register int rpcs = 0, mntvers = 1;
114	const char *host;
115	int ch, estat;
116
117	while ((ch = getopt(argc, argv, "ade3")) != -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 |= DOEXPORTS;
135			break;
136		case '3':
137			mntvers = 3;
138			break;
139		case '?':
140		default:
141			usage();
142		}
143	argc -= optind;
144	argv += optind;
145
146	if (argc > 0)
147		host = *argv;
148	else
149		host = "localhost";
150
151	if (rpcs == 0)
152		rpcs = DODUMP;
153
154	if (rpcs & DODUMP)
155		if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
156			MOUNTPROC_DUMP, (xdrproc_t)xdr_void, (char *)0,
157			(xdrproc_t)xdr_mntdump, (char *)&mntdump)) != 0) {
158			clnt_perrno(estat);
159			errx(1, "can't do mountdump rpc");
160		}
161	if (rpcs & DOEXPORTS)
162		if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
163			MOUNTPROC_EXPORT, (xdrproc_t)xdr_void, (char *)0,
164			(xdrproc_t)xdr_exportslist, (char *)&exportslist)) != 0) {
165			clnt_perrno(estat);
166			errx(1, "can't do exports rpc");
167		}
168
169	/* Now just print out the results */
170	if (rpcs & DODUMP) {
171		switch (type) {
172		case ALL:
173			printf("All mount points on %s:\n", host);
174			break;
175		case DIRS:
176			printf("Directories on %s:\n", host);
177			break;
178		default:
179			printf("Hosts on %s:\n", host);
180			break;
181		};
182		print_dump(mntdump);
183	}
184	if (rpcs & DOEXPORTS) {
185		printf("Exports list on %s:\n", host);
186		exp = exportslist;
187		while (exp) {
188			printf("%-34s ", exp->ex_dirp);
189			grp = exp->ex_groups;
190			if (grp == NULL) {
191				printf("Everyone\n");
192			} else {
193				while (grp) {
194					printf("%s ", grp->gr_name);
195					grp = grp->gr_next;
196				}
197				printf("\n");
198			}
199			exp = exp->ex_next;
200		}
201	}
202	exit(0);
203}
204
205/*
206 * tcp_callrpc has the same interface as callrpc, but tries to
207 * use tcp as transport method in order to handle large replies.
208 */
209int
210tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
211    xdrproc_t inproc, char *in, xdrproc_t outproc, char *out)
212{
213	CLIENT *client;
214	struct timeval timeout;
215	int rval;
216
217	if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL &&
218	    (client = clnt_create(host, prognum, versnum, "udp")) == NULL)
219		return ((int) rpc_createerr.cf_stat);
220
221	timeout.tv_sec = 25;
222	timeout.tv_usec = 0;
223	rval = (int) clnt_call(client, procnum,
224			       inproc, in,
225			       outproc, out,
226			       timeout);
227	clnt_destroy(client);
228 	return rval;
229}
230
231/*
232 * Xdr routine for retrieving the mount dump list
233 */
234int
235xdr_mntdump(XDR *xdrsp, struct mountlist **mlp)
236{
237	register struct mountlist *mp;
238	register struct mountlist *tp;
239	register struct mountlist **otp;
240	int val, val2;
241	int bool;
242	char *strp;
243
244	*mlp = (struct mountlist *)0;
245	if (!xdr_bool(xdrsp, &bool))
246		return (0);
247	while (bool) {
248		mp = (struct mountlist *)malloc(sizeof(struct mountlist));
249		if (mp == NULL)
250			return (0);
251		mp->ml_left = mp->ml_right = (struct mountlist *)0;
252		strp = mp->ml_host;
253		if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
254			return (0);
255		strp = mp->ml_dirp;
256		if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
257			return (0);
258
259		/*
260		 * Build a binary tree on sorted order of either host or dirp.
261		 * Drop any duplications.
262		 */
263		if (*mlp == NULL) {
264			*mlp = mp;
265		} else {
266			tp = *mlp;
267			while (tp) {
268				val = strcmp(mp->ml_host, tp->ml_host);
269				val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
270				switch (type) {
271				case ALL:
272					if (val == 0) {
273						if (val2 == 0) {
274							free((caddr_t)mp);
275							goto next;
276						}
277						val = val2;
278					}
279					break;
280				case DIRS:
281					if (val2 == 0) {
282						free((caddr_t)mp);
283						goto next;
284					}
285					val = val2;
286					break;
287				default:
288					if (val == 0) {
289						free((caddr_t)mp);
290						goto next;
291					}
292					break;
293				};
294				if (val < 0) {
295					otp = &tp->ml_left;
296					tp = tp->ml_left;
297				} else {
298					otp = &tp->ml_right;
299					tp = tp->ml_right;
300				}
301			}
302			*otp = mp;
303		}
304next:
305		if (!xdr_bool(xdrsp, &bool))
306			return (0);
307	}
308	return (1);
309}
310
311/*
312 * Xdr routine to retrieve exports list
313 */
314int
315xdr_exportslist(XDR *xdrsp, struct exportslist **exp)
316{
317	register struct exportslist *ep;
318	register struct grouplist *gp;
319	int bool, grpbool;
320	char *strp;
321
322	*exp = (struct exportslist *)0;
323	if (!xdr_bool(xdrsp, &bool))
324		return (0);
325	while (bool) {
326		ep = (struct exportslist *)malloc(sizeof(struct exportslist));
327		if (ep == NULL)
328			return (0);
329		ep->ex_groups = (struct grouplist *)0;
330		strp = ep->ex_dirp;
331		if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
332			return (0);
333		if (!xdr_bool(xdrsp, &grpbool))
334			return (0);
335		while (grpbool) {
336			gp = (struct grouplist *)malloc(sizeof(struct grouplist));
337			if (gp == NULL)
338				return (0);
339			strp = gp->gr_name;
340			if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
341				return (0);
342			gp->gr_next = ep->ex_groups;
343			ep->ex_groups = gp;
344			if (!xdr_bool(xdrsp, &grpbool))
345				return (0);
346		}
347		ep->ex_next = *exp;
348		*exp = ep;
349		if (!xdr_bool(xdrsp, &bool))
350			return (0);
351	}
352	return (1);
353}
354
355static void
356usage(void)
357{
358	fprintf(stderr, "usage: showmount [-a | -d] [-e3] [host]\n");
359	exit(1);
360}
361
362/*
363 * Print the binary tree in inorder so that output is sorted.
364 */
365void
366print_dump(struct mountlist *mp)
367{
368
369	if (mp == NULL)
370		return;
371	if (mp->ml_left)
372		print_dump(mp->ml_left);
373	switch (type) {
374	case ALL:
375		printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
376		break;
377	case DIRS:
378		printf("%s\n", mp->ml_dirp);
379		break;
380	default:
381		printf("%s\n", mp->ml_host);
382		break;
383	};
384	if (mp->ml_right)
385		print_dump(mp->ml_right);
386}
387