showmount.c revision 201382 
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 * 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, 1995\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[] = "@(#)showmount.c	8.3 (Berkeley) 3/29/95";
46#endif
47static const char rcsid[] =
48  "$FreeBSD: head/usr.bin/showmount/showmount.c 201382 2010-01-02 10:09:20Z ed $";
49#endif /* not lint */
50
51#include <sys/types.h>
52#include <sys/queue.h>
53#include <sys/file.h>
54#include <sys/socket.h>
55#include <sys/socketvar.h>
56
57#include <err.h>
58#include <netdb.h>
59#include <rpc/rpc.h>
60#include <rpc/pmap_clnt.h>
61#include <rpc/pmap_prot.h>
62#include <rpcsvc/mount.h>
63
64#include <stdio.h>
65#include <stdlib.h>
66#include <string.h>
67#include <unistd.h>
68
69/* Constant defs */
70#define	ALL	1
71#define	DIRS	2
72
73#define	DODUMP		0x1
74#define	DOEXPORTS	0x2
75
76struct mountlist {
77	struct mountlist *ml_left;
78	struct mountlist *ml_right;
79	char	ml_host[MNTNAMLEN+1];
80	char	ml_dirp[MNTPATHLEN+1];
81};
82
83struct grouplist {
84	struct grouplist *gr_next;
85	char	gr_name[MNTNAMLEN+1];
86};
87
88struct exportslist {
89	struct exportslist *ex_next;
90	struct grouplist *ex_groups;
91	char	ex_dirp[MNTPATHLEN+1];
92};
93
94static struct mountlist *mntdump;
95static struct exportslist *exportslist;
96static int type = 0;
97
98void print_dump(struct mountlist *);
99static void usage(void);
100int xdr_mntdump(XDR *, struct mountlist **);
101int xdr_exportslist(XDR *, struct exportslist **);
102int tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
103		xdrproc_t inproc, char *in, xdrproc_t outproc, char *out);
104
105/*
106 * This command queries the NFS mount daemon for it's mount list and/or
107 * it's exports list and prints them out.
108 * See "NFS: Network File System Protocol Specification, RFC1094, Appendix A"
109 * and the "Network File System Protocol XXX.."
110 * for detailed information on the protocol.
111 */
112int
113main(int argc, char **argv)
114{
115	register struct exportslist *exp;
116	register struct grouplist *grp;
117	register int rpcs = 0, mntvers = 1;
118	const char *host;
119	int ch, estat;
120
121	while ((ch = getopt(argc, argv, "ade3")) != -1)
122		switch (ch) {
123		case 'a':
124			if (type == 0) {
125				type = ALL;
126				rpcs |= DODUMP;
127			} else
128				usage();
129			break;
130		case 'd':
131			if (type == 0) {
132				type = DIRS;
133				rpcs |= DODUMP;
134			} else
135				usage();
136			break;
137		case 'e':
138			rpcs |= DOEXPORTS;
139			break;
140		case '3':
141			mntvers = 3;
142			break;
143		case '?':
144		default:
145			usage();
146		}
147	argc -= optind;
148	argv += optind;
149
150	if (argc > 0)
151		host = *argv;
152	else
153		host = "localhost";
154
155	if (rpcs == 0)
156		rpcs = DODUMP;
157
158	if (rpcs & DODUMP)
159		if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
160			MOUNTPROC_DUMP, (xdrproc_t)xdr_void, (char *)0,
161			(xdrproc_t)xdr_mntdump, (char *)&mntdump)) != 0) {
162			clnt_perrno(estat);
163			errx(1, "can't do mountdump rpc");
164		}
165	if (rpcs & DOEXPORTS)
166		if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
167			MOUNTPROC_EXPORT, (xdrproc_t)xdr_void, (char *)0,
168			(xdrproc_t)xdr_exportslist, (char *)&exportslist)) != 0) {
169			clnt_perrno(estat);
170			errx(1, "can't do exports rpc");
171		}
172
173	/* Now just print out the results */
174	if (rpcs & DODUMP) {
175		switch (type) {
176		case ALL:
177			printf("All mount points on %s:\n", host);
178			break;
179		case DIRS:
180			printf("Directories on %s:\n", host);
181			break;
182		default:
183			printf("Hosts on %s:\n", host);
184			break;
185		};
186		print_dump(mntdump);
187	}
188	if (rpcs & DOEXPORTS) {
189		printf("Exports list on %s:\n", host);
190		exp = exportslist;
191		while (exp) {
192			printf("%-35s", exp->ex_dirp);
193			grp = exp->ex_groups;
194			if (grp == NULL) {
195				printf("Everyone\n");
196			} else {
197				while (grp) {
198					printf("%s ", grp->gr_name);
199					grp = grp->gr_next;
200				}
201				printf("\n");
202			}
203			exp = exp->ex_next;
204		}
205	}
206	exit(0);
207}
208
209/*
210 * tcp_callrpc has the same interface as callrpc, but tries to
211 * use tcp as transport method in order to handle large replies.
212 */
213int
214tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
215    xdrproc_t inproc, char *in, xdrproc_t outproc, char *out)
216{
217	CLIENT *client;
218	struct timeval timeout;
219	int rval;
220
221	if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL &&
222	    (client = clnt_create(host, prognum, versnum, "udp")) == NULL)
223		return ((int) rpc_createerr.cf_stat);
224
225	timeout.tv_sec = 25;
226	timeout.tv_usec = 0;
227	rval = (int) clnt_call(client, procnum,
228			       inproc, in,
229			       outproc, out,
230			       timeout);
231	clnt_destroy(client);
232 	return rval;
233}
234
235/*
236 * Xdr routine for retrieving the mount dump list
237 */
238int
239xdr_mntdump(XDR *xdrsp, struct mountlist **mlp)
240{
241	register struct mountlist *mp;
242	register struct mountlist *tp;
243	register struct mountlist **otp;
244	int val, val2;
245	int bool;
246	char *strp;
247
248	*mlp = (struct mountlist *)0;
249	if (!xdr_bool(xdrsp, &bool))
250		return (0);
251	while (bool) {
252		mp = (struct mountlist *)malloc(sizeof(struct mountlist));
253		if (mp == NULL)
254			return (0);
255		mp->ml_left = mp->ml_right = (struct mountlist *)0;
256		strp = mp->ml_host;
257		if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
258			return (0);
259		strp = mp->ml_dirp;
260		if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
261			return (0);
262
263		/*
264		 * Build a binary tree on sorted order of either host or dirp.
265		 * Drop any duplications.
266		 */
267		if (*mlp == NULL) {
268			*mlp = mp;
269		} else {
270			tp = *mlp;
271			while (tp) {
272				val = strcmp(mp->ml_host, tp->ml_host);
273				val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
274				switch (type) {
275				case ALL:
276					if (val == 0) {
277						if (val2 == 0) {
278							free((caddr_t)mp);
279							goto next;
280						}
281						val = val2;
282					}
283					break;
284				case DIRS:
285					if (val2 == 0) {
286						free((caddr_t)mp);
287						goto next;
288					}
289					val = val2;
290					break;
291				default:
292					if (val == 0) {
293						free((caddr_t)mp);
294						goto next;
295					}
296					break;
297				};
298				if (val < 0) {
299					otp = &tp->ml_left;
300					tp = tp->ml_left;
301				} else {
302					otp = &tp->ml_right;
303					tp = tp->ml_right;
304				}
305			}
306			*otp = mp;
307		}
308next:
309		if (!xdr_bool(xdrsp, &bool))
310			return (0);
311	}
312	return (1);
313}
314
315/*
316 * Xdr routine to retrieve exports list
317 */
318int
319xdr_exportslist(XDR *xdrsp, struct exportslist **exp)
320{
321	register struct exportslist *ep;
322	register struct grouplist *gp;
323	int bool, grpbool;
324	char *strp;
325
326	*exp = (struct exportslist *)0;
327	if (!xdr_bool(xdrsp, &bool))
328		return (0);
329	while (bool) {
330		ep = (struct exportslist *)malloc(sizeof(struct exportslist));
331		if (ep == NULL)
332			return (0);
333		ep->ex_groups = (struct grouplist *)0;
334		strp = ep->ex_dirp;
335		if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
336			return (0);
337		if (!xdr_bool(xdrsp, &grpbool))
338			return (0);
339		while (grpbool) {
340			gp = (struct grouplist *)malloc(sizeof(struct grouplist));
341			if (gp == NULL)
342				return (0);
343			strp = gp->gr_name;
344			if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
345				return (0);
346			gp->gr_next = ep->ex_groups;
347			ep->ex_groups = gp;
348			if (!xdr_bool(xdrsp, &grpbool))
349				return (0);
350		}
351		ep->ex_next = *exp;
352		*exp = ep;
353		if (!xdr_bool(xdrsp, &bool))
354			return (0);
355	}
356	return (1);
357}
358
359static void
360usage(void)
361{
362	fprintf(stderr, "usage: showmount [-a | -d] [-e3] [host]\n");
363	exit(1);
364}
365
366/*
367 * Print the binary tree in inorder so that output is sorted.
368 */
369void
370print_dump(struct mountlist *mp)
371{
372
373	if (mp == NULL)
374		return;
375	if (mp->ml_left)
376		print_dump(mp->ml_left);
377	switch (type) {
378	case ALL:
379		printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
380		break;
381	case DIRS:
382		printf("%s\n", mp->ml_dirp);
383		break;
384	default:
385		printf("%s\n", mp->ml_host);
386		break;
387	};
388	if (mp->ml_right)
389		print_dump(mp->ml_right);
390}
391