showmount.c revision 50477 
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 50477 1999-08-28 01:08:13Z peter $";
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 __P((struct mountlist *));
99static void usage __P((void));
100int xdr_mntdump __P((XDR *, struct mountlist **));
101int xdr_exports __P((XDR *, struct exportslist **));
102int tcp_callrpc __P((char *host,
103		     int prognum, int versnum, int procnum,
104		     xdrproc_t inproc, char *in,
105		     xdrproc_t outproc, char *out));
106
107/*
108 * This command queries the NFS mount daemon for it's mount list and/or
109 * it's exports list and prints them out.
110 * See "NFS: Network File System Protocol Specification, RFC1094, Appendix A"
111 * and the "Network File System Protocol XXX.."
112 * for detailed information on the protocol.
113 */
114int
115main(argc, argv)
116	int argc;
117	char **argv;
118{
119	register struct exportslist *exp;
120	register struct grouplist *grp;
121	register int rpcs = 0, mntvers = 1;
122	char ch;
123	char *host;
124	int estat;
125
126	while ((ch = getopt(argc, argv, "ade3")) != -1)
127		switch((char)ch) {
128		case 'a':
129			if (type == 0) {
130				type = ALL;
131				rpcs |= DODUMP;
132			} else
133				usage();
134			break;
135		case 'd':
136			if (type == 0) {
137				type = DIRS;
138				rpcs |= DODUMP;
139			} else
140				usage();
141			break;
142		case 'e':
143			rpcs |= DOEXPORTS;
144			break;
145		case '3':
146			mntvers = 3;
147			break;
148		case '?':
149		default:
150			usage();
151		}
152	argc -= optind;
153	argv += optind;
154
155	if (argc > 0)
156		host = *argv;
157	else
158		host = "localhost";
159
160	if (rpcs == 0)
161		rpcs = DODUMP;
162
163	if (rpcs & DODUMP)
164		if ((estat = tcp_callrpc(host, RPCPROG_MNT, mntvers,
165			RPCMNT_DUMP, xdr_void, (char *)0,
166			xdr_mntdump, (char *)&mntdump)) != 0) {
167			clnt_perrno(estat);
168			errx(1, "can't do mountdump rpc");
169		}
170	if (rpcs & DOEXPORTS)
171		if ((estat = tcp_callrpc(host, RPCPROG_MNT, mntvers,
172			RPCMNT_EXPORT, xdr_void, (char *)0,
173			xdr_exports, (char *)&exports)) != 0) {
174			clnt_perrno(estat);
175			errx(1, "can't do exports rpc");
176		}
177
178	/* Now just print out the results */
179	if (rpcs & DODUMP) {
180		switch (type) {
181		case ALL:
182			printf("All mount points on %s:\n", host);
183			break;
184		case DIRS:
185			printf("Directories on %s:\n", host);
186			break;
187		default:
188			printf("Hosts on %s:\n", host);
189			break;
190		};
191		print_dump(mntdump);
192	}
193	if (rpcs & DOEXPORTS) {
194		printf("Exports list on %s:\n", host);
195		exp = exports;
196		while (exp) {
197			printf("%-35s", exp->ex_dirp);
198			grp = exp->ex_groups;
199			if (grp == NULL) {
200				printf("Everyone\n");
201			} else {
202				while (grp) {
203					printf("%s ", grp->gr_name);
204					grp = grp->gr_next;
205				}
206				printf("\n");
207			}
208			exp = exp->ex_next;
209		}
210	}
211	exit(0);
212}
213
214/*
215 * tcp_callrpc has the same interface as callrpc, but tries to
216 * use tcp as transport method in order to handle large replies.
217 */
218
219int
220tcp_callrpc(host, prognum, versnum, procnum, inproc, in, outproc, out)
221	char *host;
222	int prognum;
223	int versnum;
224	int procnum;
225	xdrproc_t inproc;
226	char *in;
227	xdrproc_t outproc;
228	char *out;
229{
230	struct hostent *hp;
231	struct sockaddr_in server_addr;
232	CLIENT *client;
233	int sock;
234	struct timeval timeout;
235	int rval;
236
237	hp = gethostbyname(host);
238
239	if (!hp)
240		return ((int) RPC_UNKNOWNHOST);
241
242	memset(&server_addr,0,sizeof(server_addr));
243	memcpy((char *) &server_addr.sin_addr,
244	       hp->h_addr,
245	       hp->h_length);
246	server_addr.sin_len = sizeof(struct sockaddr_in);
247	server_addr.sin_family =AF_INET;
248	server_addr.sin_port = 0;
249
250	sock = RPC_ANYSOCK;
251
252	client = clnttcp_create(&server_addr,
253				(u_long) prognum,
254				(u_long) versnum, &sock, 0, 0);
255	if (!client) {
256		timeout.tv_sec = 5;
257		timeout.tv_usec = 0;
258		server_addr.sin_port = 0;
259		sock = RPC_ANYSOCK;
260		client = clntudp_create(&server_addr,
261					(u_long) prognum,
262					(u_long) versnum,
263					timeout,
264					&sock);
265	}
266	if (!client)
267		return ((int) rpc_createerr.cf_stat);
268
269	timeout.tv_sec = 25;
270	timeout.tv_usec = 0;
271	rval = (int) clnt_call(client, procnum,
272			       inproc, in,
273			       outproc, out,
274			       timeout);
275	clnt_destroy(client);
276 	return rval;
277}
278
279/*
280 * Xdr routine for retrieving the mount dump list
281 */
282int
283xdr_mntdump(xdrsp, mlp)
284	XDR *xdrsp;
285	struct mountlist **mlp;
286{
287	register struct mountlist *mp;
288	register struct mountlist *tp;
289	register struct mountlist **otp;
290	int val, val2;
291	int bool;
292	char *strp;
293
294	*mlp = (struct mountlist *)0;
295	if (!xdr_bool(xdrsp, &bool))
296		return (0);
297	while (bool) {
298		mp = (struct mountlist *)malloc(sizeof(struct mountlist));
299		if (mp == NULL)
300			return (0);
301		mp->ml_left = mp->ml_right = (struct mountlist *)0;
302		strp = mp->ml_host;
303		if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
304			return (0);
305		strp = mp->ml_dirp;
306		if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
307			return (0);
308
309		/*
310		 * Build a binary tree on sorted order of either host or dirp.
311		 * Drop any duplications.
312		 */
313		if (*mlp == NULL) {
314			*mlp = mp;
315		} else {
316			tp = *mlp;
317			while (tp) {
318				val = strcmp(mp->ml_host, tp->ml_host);
319				val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
320				switch (type) {
321				case ALL:
322					if (val == 0) {
323						if (val2 == 0) {
324							free((caddr_t)mp);
325							goto next;
326						}
327						val = val2;
328					}
329					break;
330				case DIRS:
331					if (val2 == 0) {
332						free((caddr_t)mp);
333						goto next;
334					}
335					val = val2;
336					break;
337				default:
338					if (val == 0) {
339						free((caddr_t)mp);
340						goto next;
341					}
342					break;
343				};
344				if (val < 0) {
345					otp = &tp->ml_left;
346					tp = tp->ml_left;
347				} else {
348					otp = &tp->ml_right;
349					tp = tp->ml_right;
350				}
351			}
352			*otp = mp;
353		}
354next:
355		if (!xdr_bool(xdrsp, &bool))
356			return (0);
357	}
358	return (1);
359}
360
361/*
362 * Xdr routine to retrieve exports list
363 */
364int
365xdr_exports(xdrsp, exp)
366	XDR *xdrsp;
367	struct exportslist **exp;
368{
369	register struct exportslist *ep;
370	register struct grouplist *gp;
371	int bool, grpbool;
372	char *strp;
373
374	*exp = (struct exportslist *)0;
375	if (!xdr_bool(xdrsp, &bool))
376		return (0);
377	while (bool) {
378		ep = (struct exportslist *)malloc(sizeof(struct exportslist));
379		if (ep == NULL)
380			return (0);
381		ep->ex_groups = (struct grouplist *)0;
382		strp = ep->ex_dirp;
383		if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
384			return (0);
385		if (!xdr_bool(xdrsp, &grpbool))
386			return (0);
387		while (grpbool) {
388			gp = (struct grouplist *)malloc(sizeof(struct grouplist));
389			if (gp == NULL)
390				return (0);
391			strp = gp->gr_name;
392			if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
393				return (0);
394			gp->gr_next = ep->ex_groups;
395			ep->ex_groups = gp;
396			if (!xdr_bool(xdrsp, &grpbool))
397				return (0);
398		}
399		ep->ex_next = *exp;
400		*exp = ep;
401		if (!xdr_bool(xdrsp, &bool))
402			return (0);
403	}
404	return (1);
405}
406
407static void
408usage()
409{
410	fprintf(stderr, "usage: showmount [-ade3] host\n");
411	exit(1);
412}
413
414/*
415 * Print the binary tree in inorder so that output is sorted.
416 */
417void
418print_dump(mp)
419	struct mountlist *mp;
420{
421
422	if (mp == NULL)
423		return;
424	if (mp->ml_left)
425		print_dump(mp->ml_left);
426	switch (type) {
427	case ALL:
428		printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
429		break;
430	case DIRS:
431		printf("%s\n", mp->ml_dirp);
432		break;
433	default:
434		printf("%s\n", mp->ml_host);
435		break;
436	};
437	if (mp->ml_right)
438		print_dump(mp->ml_right);
439}
440