showmount.c revision 270258 
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: stable/10/usr.bin/showmount/showmount.c 270258 2014-08-21 04:31:48Z peter $";
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 = 3;
114	const char *host;
115	int ch, estat;
116
117	while ((ch = getopt(argc, argv, "ade13")) != -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 '1':
137			mntvers = 1;
138			break;
139		case '3':
140			mntvers = 3;
141			break;
142		case '?':
143		default:
144			usage();
145		}
146	argc -= optind;
147	argv += optind;
148
149	if (argc > 0)
150		host = *argv;
151	else
152		host = "localhost";
153
154	if (rpcs == 0)
155		rpcs = DODUMP;
156
157	if (rpcs & DODUMP)
158		if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
159			MOUNTPROC_DUMP, (xdrproc_t)xdr_void, (char *)0,
160			(xdrproc_t)xdr_mntdump, (char *)&mntdump)) != 0) {
161			clnt_perrno(estat);
162			errx(1, "can't do mountdump rpc");
163		}
164	if (rpcs & DOEXPORTS)
165		if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
166			MOUNTPROC_EXPORT, (xdrproc_t)xdr_void, (char *)0,
167			(xdrproc_t)xdr_exportslist, (char *)&exportslist)) != 0) {
168			clnt_perrno(estat);
169			errx(1, "can't do exports rpc");
170		}
171
172	/* Now just print out the results */
173	if (rpcs & DODUMP) {
174		switch (type) {
175		case ALL:
176			printf("All mount points on %s:\n", host);
177			break;
178		case DIRS:
179			printf("Directories on %s:\n", host);
180			break;
181		default:
182			printf("Hosts on %s:\n", host);
183			break;
184		};
185		print_dump(mntdump);
186	}
187	if (rpcs & DOEXPORTS) {
188		printf("Exports list on %s:\n", host);
189		exp = exportslist;
190		while (exp) {
191			printf("%-34s ", exp->ex_dirp);
192			grp = exp->ex_groups;
193			if (grp == NULL) {
194				printf("Everyone\n");
195			} else {
196				while (grp) {
197					printf("%s ", grp->gr_name);
198					grp = grp->gr_next;
199				}
200				printf("\n");
201			}
202			exp = exp->ex_next;
203		}
204	}
205	exit(0);
206}
207
208/*
209 * tcp_callrpc has the same interface as callrpc, but tries to
210 * use tcp as transport method in order to handle large replies.
211 */
212int
213tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
214    xdrproc_t inproc, char *in, xdrproc_t outproc, char *out)
215{
216	CLIENT *client;
217	struct timeval timeout;
218	int rval;
219
220	if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL &&
221	    (client = clnt_create(host, prognum, versnum, "udp")) == NULL)
222		return ((int) rpc_createerr.cf_stat);
223
224	timeout.tv_sec = 25;
225	timeout.tv_usec = 0;
226	rval = (int) clnt_call(client, procnum,
227			       inproc, in,
228			       outproc, out,
229			       timeout);
230	clnt_destroy(client);
231 	return rval;
232}
233
234/*
235 * Xdr routine for retrieving the mount dump list
236 */
237int
238xdr_mntdump(XDR *xdrsp, struct mountlist **mlp)
239{
240	register struct mountlist *mp;
241	register struct mountlist *tp;
242	register struct mountlist **otp;
243	int val, val2;
244	int bool;
245	char *strp;
246
247	*mlp = (struct mountlist *)0;
248	if (!xdr_bool(xdrsp, &bool))
249		return (0);
250	while (bool) {
251		mp = (struct mountlist *)malloc(sizeof(struct mountlist));
252		if (mp == NULL)
253			return (0);
254		mp->ml_left = mp->ml_right = (struct mountlist *)0;
255		strp = mp->ml_host;
256		if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
257			return (0);
258		strp = mp->ml_dirp;
259		if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
260			return (0);
261
262		/*
263		 * Build a binary tree on sorted order of either host or dirp.
264		 * Drop any duplications.
265		 */
266		if (*mlp == NULL) {
267			*mlp = mp;
268		} else {
269			tp = *mlp;
270			while (tp) {
271				val = strcmp(mp->ml_host, tp->ml_host);
272				val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
273				switch (type) {
274				case ALL:
275					if (val == 0) {
276						if (val2 == 0) {
277							free((caddr_t)mp);
278							goto next;
279						}
280						val = val2;
281					}
282					break;
283				case DIRS:
284					if (val2 == 0) {
285						free((caddr_t)mp);
286						goto next;
287					}
288					val = val2;
289					break;
290				default:
291					if (val == 0) {
292						free((caddr_t)mp);
293						goto next;
294					}
295					break;
296				};
297				if (val < 0) {
298					otp = &tp->ml_left;
299					tp = tp->ml_left;
300				} else {
301					otp = &tp->ml_right;
302					tp = tp->ml_right;
303				}
304			}
305			*otp = mp;
306		}
307next:
308		if (!xdr_bool(xdrsp, &bool))
309			return (0);
310	}
311	return (1);
312}
313
314/*
315 * Xdr routine to retrieve exports list
316 */
317int
318xdr_exportslist(XDR *xdrsp, struct exportslist **exp)
319{
320	register struct exportslist *ep;
321	register struct grouplist *gp;
322	int bool, grpbool;
323	char *strp;
324
325	*exp = (struct exportslist *)0;
326	if (!xdr_bool(xdrsp, &bool))
327		return (0);
328	while (bool) {
329		ep = (struct exportslist *)malloc(sizeof(struct exportslist));
330		if (ep == NULL)
331			return (0);
332		ep->ex_groups = (struct grouplist *)0;
333		strp = ep->ex_dirp;
334		if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
335			return (0);
336		if (!xdr_bool(xdrsp, &grpbool))
337			return (0);
338		while (grpbool) {
339			gp = (struct grouplist *)malloc(sizeof(struct grouplist));
340			if (gp == NULL)
341				return (0);
342			strp = gp->gr_name;
343			if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
344				return (0);
345			gp->gr_next = ep->ex_groups;
346			ep->ex_groups = gp;
347			if (!xdr_bool(xdrsp, &grpbool))
348				return (0);
349		}
350		ep->ex_next = *exp;
351		*exp = ep;
352		if (!xdr_bool(xdrsp, &bool))
353			return (0);
354	}
355	return (1);
356}
357
358static void
359usage(void)
360{
361	fprintf(stderr, "usage: showmount [-a | -d] [-e3] [host]\n");
362	exit(1);
363}
364
365/*
366 * Print the binary tree in inorder so that output is sorted.
367 */
368void
369print_dump(struct mountlist *mp)
370{
371
372	if (mp == NULL)
373		return;
374	if (mp->ml_left)
375		print_dump(mp->ml_left);
376	switch (type) {
377	case ALL:
378		printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
379		break;
380	case DIRS:
381		printf("%s\n", mp->ml_dirp);
382		break;
383	default:
384		printf("%s\n", mp->ml_host);
385		break;
386	};
387	if (mp->ml_right)
388		print_dump(mp->ml_right);
389}
390