showmount.c revision 92922 
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 92922 2002-03-22 01:42:45Z imp $";
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 <nfs/rpcv2.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[RPCMNT_NAMELEN+1];
80	char	ml_dirp[RPCMNT_PATHLEN+1];
81};
82
83struct grouplist {
84	struct grouplist *gr_next;
85	char	gr_name[RPCMNT_NAMELEN+1];
86};
87
88struct exportslist {
89	struct exportslist *ex_next;
90	struct grouplist *ex_groups;
91	char	ex_dirp[RPCMNT_PATHLEN+1];
92};
93
94static struct mountlist *mntdump;
95static struct exportslist *exports;
96static int type = 0;
97
98void print_dump(struct mountlist *);
99static void usage(void);
100int xdr_mntdump(XDR *, struct mountlist **);
101int xdr_exports(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(argc, argv)
114	int argc;
115	char **argv;
116{
117	register struct exportslist *exp;
118	register struct grouplist *grp;
119	register int rpcs = 0, mntvers = 1;
120	char ch;
121	const char *host;
122	int estat;
123
124	while ((ch = getopt(argc, argv, "ade3")) != -1)
125		switch((char)ch) {
126		case 'a':
127			if (type == 0) {
128				type = ALL;
129				rpcs |= DODUMP;
130			} else
131				usage();
132			break;
133		case 'd':
134			if (type == 0) {
135				type = DIRS;
136				rpcs |= DODUMP;
137			} else
138				usage();
139			break;
140		case 'e':
141			rpcs |= DOEXPORTS;
142			break;
143		case '3':
144			mntvers = 3;
145			break;
146		case '?':
147		default:
148			usage();
149		}
150	argc -= optind;
151	argv += optind;
152
153	if (argc > 0)
154		host = *argv;
155	else
156		host = "localhost";
157
158	if (rpcs == 0)
159		rpcs = DODUMP;
160
161	if (rpcs & DODUMP)
162		if ((estat = tcp_callrpc(host, RPCPROG_MNT, mntvers,
163			RPCMNT_DUMP, xdr_void, (char *)0,
164			xdr_mntdump, (char *)&mntdump)) != 0) {
165			clnt_perrno(estat);
166			errx(1, "can't do mountdump rpc");
167		}
168	if (rpcs & DOEXPORTS)
169		if ((estat = tcp_callrpc(host, RPCPROG_MNT, mntvers,
170			RPCMNT_EXPORT, xdr_void, (char *)0,
171			xdr_exports, (char *)&exports)) != 0) {
172			clnt_perrno(estat);
173			errx(1, "can't do exports rpc");
174		}
175
176	/* Now just print out the results */
177	if (rpcs & DODUMP) {
178		switch (type) {
179		case ALL:
180			printf("All mount points on %s:\n", host);
181			break;
182		case DIRS:
183			printf("Directories on %s:\n", host);
184			break;
185		default:
186			printf("Hosts on %s:\n", host);
187			break;
188		};
189		print_dump(mntdump);
190	}
191	if (rpcs & DOEXPORTS) {
192		printf("Exports list on %s:\n", host);
193		exp = exports;
194		while (exp) {
195			printf("%-35s", exp->ex_dirp);
196			grp = exp->ex_groups;
197			if (grp == NULL) {
198				printf("Everyone\n");
199			} else {
200				while (grp) {
201					printf("%s ", grp->gr_name);
202					grp = grp->gr_next;
203				}
204				printf("\n");
205			}
206			exp = exp->ex_next;
207		}
208	}
209	exit(0);
210}
211
212/*
213 * tcp_callrpc has the same interface as callrpc, but tries to
214 * use tcp as transport method in order to handle large replies.
215 */
216int
217tcp_callrpc(host, prognum, versnum, procnum, inproc, in, outproc, out)
218	const char *host;
219	int prognum;
220	int versnum;
221	int procnum;
222	xdrproc_t inproc;
223	char *in;
224	xdrproc_t outproc;
225	char *out;
226{
227	CLIENT *client;
228	struct timeval timeout;
229	int rval;
230
231	if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL &&
232	    (client = clnt_create(host, prognum, versnum, "udp")) == NULL)
233		return ((int) rpc_createerr.cf_stat);
234
235	timeout.tv_sec = 25;
236	timeout.tv_usec = 0;
237	rval = (int) clnt_call(client, procnum,
238			       inproc, in,
239			       outproc, out,
240			       timeout);
241	clnt_destroy(client);
242 	return rval;
243}
244
245/*
246 * Xdr routine for retrieving the mount dump list
247 */
248int
249xdr_mntdump(xdrsp, mlp)
250	XDR *xdrsp;
251	struct mountlist **mlp;
252{
253	register struct mountlist *mp;
254	register struct mountlist *tp;
255	register struct mountlist **otp;
256	int val, val2;
257	int bool;
258	char *strp;
259
260	*mlp = (struct mountlist *)0;
261	if (!xdr_bool(xdrsp, &bool))
262		return (0);
263	while (bool) {
264		mp = (struct mountlist *)malloc(sizeof(struct mountlist));
265		if (mp == NULL)
266			return (0);
267		mp->ml_left = mp->ml_right = (struct mountlist *)0;
268		strp = mp->ml_host;
269		if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
270			return (0);
271		strp = mp->ml_dirp;
272		if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
273			return (0);
274
275		/*
276		 * Build a binary tree on sorted order of either host or dirp.
277		 * Drop any duplications.
278		 */
279		if (*mlp == NULL) {
280			*mlp = mp;
281		} else {
282			tp = *mlp;
283			while (tp) {
284				val = strcmp(mp->ml_host, tp->ml_host);
285				val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
286				switch (type) {
287				case ALL:
288					if (val == 0) {
289						if (val2 == 0) {
290							free((caddr_t)mp);
291							goto next;
292						}
293						val = val2;
294					}
295					break;
296				case DIRS:
297					if (val2 == 0) {
298						free((caddr_t)mp);
299						goto next;
300					}
301					val = val2;
302					break;
303				default:
304					if (val == 0) {
305						free((caddr_t)mp);
306						goto next;
307					}
308					break;
309				};
310				if (val < 0) {
311					otp = &tp->ml_left;
312					tp = tp->ml_left;
313				} else {
314					otp = &tp->ml_right;
315					tp = tp->ml_right;
316				}
317			}
318			*otp = mp;
319		}
320next:
321		if (!xdr_bool(xdrsp, &bool))
322			return (0);
323	}
324	return (1);
325}
326
327/*
328 * Xdr routine to retrieve exports list
329 */
330int
331xdr_exports(xdrsp, exp)
332	XDR *xdrsp;
333	struct exportslist **exp;
334{
335	register struct exportslist *ep;
336	register struct grouplist *gp;
337	int bool, grpbool;
338	char *strp;
339
340	*exp = (struct exportslist *)0;
341	if (!xdr_bool(xdrsp, &bool))
342		return (0);
343	while (bool) {
344		ep = (struct exportslist *)malloc(sizeof(struct exportslist));
345		if (ep == NULL)
346			return (0);
347		ep->ex_groups = (struct grouplist *)0;
348		strp = ep->ex_dirp;
349		if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
350			return (0);
351		if (!xdr_bool(xdrsp, &grpbool))
352			return (0);
353		while (grpbool) {
354			gp = (struct grouplist *)malloc(sizeof(struct grouplist));
355			if (gp == NULL)
356				return (0);
357			strp = gp->gr_name;
358			if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
359				return (0);
360			gp->gr_next = ep->ex_groups;
361			ep->ex_groups = gp;
362			if (!xdr_bool(xdrsp, &grpbool))
363				return (0);
364		}
365		ep->ex_next = *exp;
366		*exp = ep;
367		if (!xdr_bool(xdrsp, &bool))
368			return (0);
369	}
370	return (1);
371}
372
373static void
374usage()
375{
376	fprintf(stderr, "usage: showmount [-ade3] host\n");
377	exit(1);
378}
379
380/*
381 * Print the binary tree in inorder so that output is sorted.
382 */
383void
384print_dump(mp)
385	struct mountlist *mp;
386{
387
388	if (mp == NULL)
389		return;
390	if (mp->ml_left)
391		print_dump(mp->ml_left);
392	switch (type) {
393	case ALL:
394		printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
395		break;
396	case DIRS:
397		printf("%s\n", mp->ml_dirp);
398		break;
399	default:
400		printf("%s\n", mp->ml_host);
401		break;
402	};
403	if (mp->ml_right)
404		print_dump(mp->ml_right);
405}
406