1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993, 1995
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Rick Macklem at The University of Guelph.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #ifndef lint
36 static const char copyright[] =
37 "@(#) Copyright (c) 1989, 1993, 1995\n\
38 The Regents of the University of California. All rights reserved.\n";
39 #endif /* not lint */
40
41 #ifndef lint
42 #if 0
43 static char sccsid[] = "@(#)showmount.c 8.3 (Berkeley) 3/29/95";
44 #endif
45 static const char rcsid[] =
46 "$FreeBSD$";
47 #endif /* not lint */
48
49 #include <sys/types.h>
50 #include <sys/queue.h>
51 #include <sys/file.h>
52 #include <sys/socket.h>
53 #include <sys/socketvar.h>
54
55 #include <err.h>
56 #include <netdb.h>
57 #include <rpc/rpc.h>
58 #include <rpc/pmap_clnt.h>
59 #include <rpc/pmap_prot.h>
60 #include <rpcsvc/mount.h>
61
62 #include <stdio.h>
63 #include <stdlib.h>
64 #include <string.h>
65 #include <unistd.h>
66 #include <vis.h>
67
68 /* Constant defs */
69 #define ALL 1
70 #define DIRS 2
71
72 #define DODUMP 0x1
73 #define DOEXPORTS 0x2
74 #define DOPARSABLEEXPORTS 0x4
75
76 struct 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
83 struct grouplist {
84 struct grouplist *gr_next;
85 char gr_name[MNTNAMLEN+1];
86 };
87
88 struct exportslist {
89 struct exportslist *ex_next;
90 struct grouplist *ex_groups;
91 char ex_dirp[MNTPATHLEN+1];
92 };
93
94 static struct mountlist *mntdump;
95 static struct exportslist *exportslist;
96 static int type = 0;
97
98 void print_dump(struct mountlist *);
99 static void usage(void);
100 int xdr_mntdump(XDR *, struct mountlist **);
101 int xdr_exportslist(XDR *, struct exportslist **);
102 int 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 */
112 int
main(int argc,char ** argv)113 main(int argc, char **argv)
114 {
115 char strvised[MNTPATHLEN * 4 + 1];
116 register struct exportslist *exp;
117 register struct grouplist *grp;
118 register int rpcs = 0, mntvers = 3;
119 const char *host;
120 int ch, estat, nbytes;
121
122 while ((ch = getopt(argc, argv, "adEe13")) != -1)
123 switch (ch) {
124 case 'a':
125 if (type == 0) {
126 type = ALL;
127 rpcs |= DODUMP;
128 } else
129 usage();
130 break;
131 case 'd':
132 if (type == 0) {
133 type = DIRS;
134 rpcs |= DODUMP;
135 } else
136 usage();
137 break;
138 case 'E':
139 rpcs |= DOPARSABLEEXPORTS;
140 break;
141 case 'e':
142 rpcs |= DOEXPORTS;
143 break;
144 case '1':
145 mntvers = 1;
146 break;
147 case '3':
148 mntvers = 3;
149 break;
150 case '?':
151 default:
152 usage();
153 }
154 argc -= optind;
155 argv += optind;
156
157 if ((rpcs & DOPARSABLEEXPORTS) != 0) {
158 if ((rpcs & DOEXPORTS) != 0)
159 errx(1, "-E cannot be used with -e");
160 if ((rpcs & DODUMP) != 0)
161 errx(1, "-E cannot be used with -a or -d");
162 }
163
164 if (argc > 0)
165 host = *argv;
166 else
167 host = "localhost";
168
169 if (rpcs == 0)
170 rpcs = DODUMP;
171
172 if (rpcs & DODUMP)
173 if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
174 MOUNTPROC_DUMP, (xdrproc_t)xdr_void, (char *)0,
175 (xdrproc_t)xdr_mntdump, (char *)&mntdump)) != 0) {
176 clnt_perrno(estat);
177 errx(1, "can't do mountdump rpc");
178 }
179 if (rpcs & (DOEXPORTS | DOPARSABLEEXPORTS))
180 if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
181 MOUNTPROC_EXPORT, (xdrproc_t)xdr_void, (char *)0,
182 (xdrproc_t)xdr_exportslist, (char *)&exportslist)) != 0) {
183 clnt_perrno(estat);
184 errx(1, "can't do exports rpc");
185 }
186
187 /* Now just print out the results */
188 if (rpcs & DODUMP) {
189 switch (type) {
190 case ALL:
191 printf("All mount points on %s:\n", host);
192 break;
193 case DIRS:
194 printf("Directories on %s:\n", host);
195 break;
196 default:
197 printf("Hosts on %s:\n", host);
198 break;
199 }
200 print_dump(mntdump);
201 }
202 if (rpcs & DOEXPORTS) {
203 printf("Exports list on %s:\n", host);
204 exp = exportslist;
205 while (exp) {
206 printf("%-34s ", exp->ex_dirp);
207 grp = exp->ex_groups;
208 if (grp == NULL) {
209 printf("Everyone\n");
210 } else {
211 while (grp) {
212 printf("%s ", grp->gr_name);
213 grp = grp->gr_next;
214 }
215 printf("\n");
216 }
217 exp = exp->ex_next;
218 }
219 }
220 if (rpcs & DOPARSABLEEXPORTS) {
221 exp = exportslist;
222 while (exp) {
223 nbytes = strsnvis(strvised, sizeof(strvised),
224 exp->ex_dirp, VIS_GLOB | VIS_NL, "\"'$");
225 if (nbytes == -1)
226 err(1, "strsnvis");
227 printf("%s\n", strvised);
228 exp = exp->ex_next;
229 }
230 }
231 exit(0);
232 }
233
234 /*
235 * tcp_callrpc has the same interface as callrpc, but tries to
236 * use tcp as transport method in order to handle large replies.
237 */
238 int
tcp_callrpc(const char * host,int prognum,int versnum,int procnum,xdrproc_t inproc,char * in,xdrproc_t outproc,char * out)239 tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
240 xdrproc_t inproc, char *in, xdrproc_t outproc, char *out)
241 {
242 CLIENT *client;
243 struct timeval timeout;
244 int rval;
245
246 if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL &&
247 (client = clnt_create(host, prognum, versnum, "udp")) == NULL)
248 return ((int) rpc_createerr.cf_stat);
249
250 timeout.tv_sec = 25;
251 timeout.tv_usec = 0;
252 rval = (int) clnt_call(client, procnum,
253 inproc, in,
254 outproc, out,
255 timeout);
256 clnt_destroy(client);
257 return rval;
258 }
259
260 /*
261 * Xdr routine for retrieving the mount dump list
262 */
263 int
xdr_mntdump(XDR * xdrsp,struct mountlist ** mlp)264 xdr_mntdump(XDR *xdrsp, struct mountlist **mlp)
265 {
266 register struct mountlist *mp;
267 register struct mountlist *tp;
268 register struct mountlist **otp;
269 int val, val2;
270 int bool;
271 char *strp;
272
273 *mlp = (struct mountlist *)0;
274 if (!xdr_bool(xdrsp, &bool))
275 return (0);
276 while (bool) {
277 mp = (struct mountlist *)malloc(sizeof(struct mountlist));
278 if (mp == NULL)
279 return (0);
280 mp->ml_left = mp->ml_right = (struct mountlist *)0;
281 strp = mp->ml_host;
282 if (!xdr_string(xdrsp, &strp, MNTNAMLEN)) {
283 free(mp);
284 return (0);
285 }
286 strp = mp->ml_dirp;
287 if (!xdr_string(xdrsp, &strp, MNTPATHLEN)) {
288 free(mp);
289 return (0);
290 }
291
292 /*
293 * Build a binary tree on sorted order of either host or dirp.
294 * Drop any duplications.
295 */
296 if (*mlp == NULL) {
297 *mlp = mp;
298 } else {
299 tp = *mlp;
300 while (tp) {
301 val = strcmp(mp->ml_host, tp->ml_host);
302 val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
303 switch (type) {
304 case ALL:
305 if (val == 0) {
306 if (val2 == 0) {
307 free((caddr_t)mp);
308 goto next;
309 }
310 val = val2;
311 }
312 break;
313 case DIRS:
314 if (val2 == 0) {
315 free((caddr_t)mp);
316 goto next;
317 }
318 val = val2;
319 break;
320 default:
321 if (val == 0) {
322 free((caddr_t)mp);
323 goto next;
324 }
325 break;
326 }
327 if (val < 0) {
328 otp = &tp->ml_left;
329 tp = tp->ml_left;
330 } else {
331 otp = &tp->ml_right;
332 tp = tp->ml_right;
333 }
334 }
335 *otp = mp;
336 }
337 next:
338 if (!xdr_bool(xdrsp, &bool))
339 return (0);
340 }
341 return (1);
342 }
343
344 /*
345 * Xdr routine to retrieve exports list
346 */
347 int
xdr_exportslist(XDR * xdrsp,struct exportslist ** exp)348 xdr_exportslist(XDR *xdrsp, struct exportslist **exp)
349 {
350 register struct exportslist *ep;
351 register struct grouplist *gp;
352 int bool, grpbool;
353 char *strp;
354
355 *exp = (struct exportslist *)0;
356 if (!xdr_bool(xdrsp, &bool))
357 return (0);
358 while (bool) {
359 ep = (struct exportslist *)malloc(sizeof(struct exportslist));
360 if (ep == NULL)
361 return (0);
362 ep->ex_groups = (struct grouplist *)0;
363 strp = ep->ex_dirp;
364 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
365 return (0);
366 if (!xdr_bool(xdrsp, &grpbool))
367 return (0);
368 while (grpbool) {
369 gp = (struct grouplist *)malloc(sizeof(struct grouplist));
370 if (gp == NULL)
371 return (0);
372 strp = gp->gr_name;
373 if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
374 return (0);
375 gp->gr_next = ep->ex_groups;
376 ep->ex_groups = gp;
377 if (!xdr_bool(xdrsp, &grpbool))
378 return (0);
379 }
380 ep->ex_next = *exp;
381 *exp = ep;
382 if (!xdr_bool(xdrsp, &bool))
383 return (0);
384 }
385 return (1);
386 }
387
388 static void
usage(void)389 usage(void)
390 {
391 fprintf(stderr, "usage: showmount [-a | -d] [-e3] [host]\n");
392 exit(1);
393 }
394
395 /*
396 * Print the binary tree in inorder so that output is sorted.
397 */
398 void
print_dump(struct mountlist * mp)399 print_dump(struct mountlist *mp)
400 {
401
402 if (mp == NULL)
403 return;
404 if (mp->ml_left)
405 print_dump(mp->ml_left);
406 switch (type) {
407 case ALL:
408 printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
409 break;
410 case DIRS:
411 printf("%s\n", mp->ml_dirp);
412 break;
413 default:
414 printf("%s\n", mp->ml_host);
415 break;
416 }
417 if (mp->ml_right)
418 print_dump(mp->ml_right);
419 }
420