summaryrefslogtreecommitdiffstats
path: root/usr.bin/showmount/showmount.c
blob: 01c9e261c753e626f664ab2264c2aef73d24a8ad (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
/*
 * Copyright (c) 1989, 1993, 1995
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rick Macklem at The University of Guelph.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1989, 1993, 1995\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)showmount.c	8.3 (Berkeley) 3/29/95";
#endif
static const char rcsid[] =
  "$FreeBSD$";
#endif /* not lint */

#include <sys/types.h>
#include <sys/queue.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <sys/socketvar.h>

#include <err.h>
#include <netdb.h>
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#include <rpc/pmap_prot.h>
#include <rpcsvc/mount.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <vis.h>

/* Constant defs */
#define	ALL	1
#define	DIRS	2

#define	DODUMP			0x1
#define	DOEXPORTS		0x2
#define	DOPARSABLEEXPORTS	0x4

struct mountlist {
	struct mountlist *ml_left;
	struct mountlist *ml_right;
	char	ml_host[MNTNAMLEN+1];
	char	ml_dirp[MNTPATHLEN+1];
};

struct grouplist {
	struct grouplist *gr_next;
	char	gr_name[MNTNAMLEN+1];
};

struct exportslist {
	struct exportslist *ex_next;
	struct grouplist *ex_groups;
	char	ex_dirp[MNTPATHLEN+1];
};

static struct mountlist *mntdump;
static struct exportslist *exportslist;
static int type = 0;

void print_dump(struct mountlist *);
static void usage(void);
int xdr_mntdump(XDR *, struct mountlist **);
int xdr_exportslist(XDR *, struct exportslist **);
int tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
		xdrproc_t inproc, char *in, xdrproc_t outproc, char *out);

/*
 * This command queries the NFS mount daemon for it's mount list and/or
 * it's exports list and prints them out.
 * See "NFS: Network File System Protocol Specification, RFC1094, Appendix A"
 * and the "Network File System Protocol XXX.."
 * for detailed information on the protocol.
 */
int
main(int argc, char **argv)
{
	char strvised[MNTPATHLEN * 4 + 1];
	register struct exportslist *exp;
	register struct grouplist *grp;
	register int rpcs = 0, mntvers = 3;
	const char *host;
	int ch, estat, nbytes;

	while ((ch = getopt(argc, argv, "adEe13")) != -1)
		switch (ch) {
		case 'a':
			if (type == 0) {
				type = ALL;
				rpcs |= DODUMP;
			} else
				usage();
			break;
		case 'd':
			if (type == 0) {
				type = DIRS;
				rpcs |= DODUMP;
			} else
				usage();
			break;
		case 'E':
			rpcs |= DOPARSABLEEXPORTS;
			break;
		case 'e':
			rpcs |= DOEXPORTS;
			break;
		case '1':
			mntvers = 1;
			break;
		case '3':
			mntvers = 3;
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if ((rpcs & DOPARSABLEEXPORTS) != 0) {
		if ((rpcs & DOEXPORTS) != 0)
			errx(1, "-E cannot be used with -e");
		if ((rpcs & DODUMP) != 0)
			errx(1, "-E cannot be used with -a or -d");
	}

	if (argc > 0)
		host = *argv;
	else
		host = "localhost";

	if (rpcs == 0)
		rpcs = DODUMP;

	if (rpcs & DODUMP)
		if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
			MOUNTPROC_DUMP, (xdrproc_t)xdr_void, (char *)0,
			(xdrproc_t)xdr_mntdump, (char *)&mntdump)) != 0) {
			clnt_perrno(estat);
			errx(1, "can't do mountdump rpc");
		}
	if (rpcs & (DOEXPORTS | DOPARSABLEEXPORTS))
		if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
			MOUNTPROC_EXPORT, (xdrproc_t)xdr_void, (char *)0,
			(xdrproc_t)xdr_exportslist, (char *)&exportslist)) != 0) {
			clnt_perrno(estat);
			errx(1, "can't do exports rpc");
		}

	/* Now just print out the results */
	if (rpcs & DODUMP) {
		switch (type) {
		case ALL:
			printf("All mount points on %s:\n", host);
			break;
		case DIRS:
			printf("Directories on %s:\n", host);
			break;
		default:
			printf("Hosts on %s:\n", host);
			break;
		}
		print_dump(mntdump);
	}
	if (rpcs & DOEXPORTS) {
		printf("Exports list on %s:\n", host);
		exp = exportslist;
		while (exp) {
			printf("%-34s ", exp->ex_dirp);
			grp = exp->ex_groups;
			if (grp == NULL) {
				printf("Everyone\n");
			} else {
				while (grp) {
					printf("%s ", grp->gr_name);
					grp = grp->gr_next;
				}
				printf("\n");
			}
			exp = exp->ex_next;
		}
	}
	if (rpcs & DOPARSABLEEXPORTS) {
		exp = exportslist;
		while (exp) {
			nbytes = strsnvis(strvised, sizeof(strvised),
			    exp->ex_dirp, VIS_GLOB | VIS_NL, "\"'$");
			if (nbytes == -1)
				err(1, "strsnvis");
			printf("%s\n", strvised);
			exp = exp->ex_next;
		}
	}
	exit(0);
}

/*
 * tcp_callrpc has the same interface as callrpc, but tries to
 * use tcp as transport method in order to handle large replies.
 */
int 
tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
    xdrproc_t inproc, char *in, xdrproc_t outproc, char *out)
{
	CLIENT *client;
	struct timeval timeout;
	int rval;

	if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL &&
	    (client = clnt_create(host, prognum, versnum, "udp")) == NULL)
		return ((int) rpc_createerr.cf_stat);

	timeout.tv_sec = 25;
	timeout.tv_usec = 0;
	rval = (int) clnt_call(client, procnum, 
			       inproc, in,
			       outproc, out,
			       timeout);
	clnt_destroy(client);
 	return rval;
}

/*
 * Xdr routine for retrieving the mount dump list
 */
int
xdr_mntdump(XDR *xdrsp, struct mountlist **mlp)
{
	register struct mountlist *mp;
	register struct mountlist *tp;
	register struct mountlist **otp;
	int val, val2;
	int bool;
	char *strp;

	*mlp = (struct mountlist *)0;
	if (!xdr_bool(xdrsp, &bool))
		return (0);
	while (bool) {
		mp = (struct mountlist *)malloc(sizeof(struct mountlist));
		if (mp == NULL)
			return (0);
		mp->ml_left = mp->ml_right = (struct mountlist *)0;
		strp = mp->ml_host;
		if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
			return (0);
		strp = mp->ml_dirp;
		if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
			return (0);

		/*
		 * Build a binary tree on sorted order of either host or dirp.
		 * Drop any duplications.
		 */
		if (*mlp == NULL) {
			*mlp = mp;
		} else {
			tp = *mlp;
			while (tp) {
				val = strcmp(mp->ml_host, tp->ml_host);
				val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
				switch (type) {
				case ALL:
					if (val == 0) {
						if (val2 == 0) {
							free((caddr_t)mp);
							goto next;
						}
						val = val2;
					}
					break;
				case DIRS:
					if (val2 == 0) {
						free((caddr_t)mp);
						goto next;
					}
					val = val2;
					break;
				default:
					if (val == 0) {
						free((caddr_t)mp);
						goto next;
					}
					break;
				}
				if (val < 0) {
					otp = &tp->ml_left;
					tp = tp->ml_left;
				} else {
					otp = &tp->ml_right;
					tp = tp->ml_right;
				}
			}
			*otp = mp;
		}
next:
		if (!xdr_bool(xdrsp, &bool))
			return (0);
	}
	return (1);
}

/*
 * Xdr routine to retrieve exports list
 */
int
xdr_exportslist(XDR *xdrsp, struct exportslist **exp)
{
	register struct exportslist *ep;
	register struct grouplist *gp;
	int bool, grpbool;
	char *strp;

	*exp = (struct exportslist *)0;
	if (!xdr_bool(xdrsp, &bool))
		return (0);
	while (bool) {
		ep = (struct exportslist *)malloc(sizeof(struct exportslist));
		if (ep == NULL)
			return (0);
		ep->ex_groups = (struct grouplist *)0;
		strp = ep->ex_dirp;
		if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
			return (0);
		if (!xdr_bool(xdrsp, &grpbool))
			return (0);
		while (grpbool) {
			gp = (struct grouplist *)malloc(sizeof(struct grouplist));
			if (gp == NULL)
				return (0);
			strp = gp->gr_name;
			if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
				return (0);
			gp->gr_next = ep->ex_groups;
			ep->ex_groups = gp;
			if (!xdr_bool(xdrsp, &grpbool))
				return (0);
		}
		ep->ex_next = *exp;
		*exp = ep;
		if (!xdr_bool(xdrsp, &bool))
			return (0);
	}
	return (1);
}

static void
usage(void)
{
	fprintf(stderr, "usage: showmount [-a | -d] [-e3] [host]\n");
	exit(1);
}

/*
 * Print the binary tree in inorder so that output is sorted.
 */
void
print_dump(struct mountlist *mp)
{

	if (mp == NULL)
		return;
	if (mp->ml_left)
		print_dump(mp->ml_left);
	switch (type) {
	case ALL:
		printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
		break;
	case DIRS:
		printf("%s\n", mp->ml_dirp);
		break;
	default:
		printf("%s\n", mp->ml_host);
		break;
	}
	if (mp->ml_right)
		print_dump(mp->ml_right);
}
OpenPOWER on IntegriCloud