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 <getopt.h>
57 #include <netdb.h>
58 #include <rpc/rpc.h>
59 #include <rpc/pmap_clnt.h>
60 #include <rpc/pmap_prot.h>
61 #include <rpcsvc/mount.h>
62
63 #include <stdio.h>
64 #include <stdlib.h>
65 #include <string.h>
66 #include <unistd.h>
67 #include <vis.h>
68
69 /* Constant defs */
70 #define ALL 1
71 #define DIRS 2
72
73 #define DODUMP 0x1
74 #define DOEXPORTS 0x2
75 #define DOPARSABLEEXPORTS 0x4
76
77 struct mountlist {
78 struct mountlist *ml_left;
79 struct mountlist *ml_right;
80 char ml_host[MNTNAMLEN+1];
81 char ml_dirp[MNTPATHLEN+1];
82 };
83
84 struct grouplist {
85 struct grouplist *gr_next;
86 char gr_name[MNTNAMLEN+1];
87 };
88
89 struct exportslist {
90 struct exportslist *ex_next;
91 struct grouplist *ex_groups;
92 char ex_dirp[MNTPATHLEN+1];
93 };
94
95 static struct mountlist *mntdump;
96 static struct exportslist *exportslist;
97 static int type = 0;
98
99 void print_dump(struct mountlist *);
100 static void usage(void);
101 int xdr_mntdump(XDR *, struct mountlist **);
102 int xdr_exportslist(XDR *, struct exportslist **);
103 int tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
104 xdrproc_t inproc, char *in, xdrproc_t outproc, char *out);
105
106 static const struct option long_opts[] = {
107 { "all", no_argument, NULL, 'a' },
108 { "directories", no_argument, NULL, 'd' },
109 { "exports-script", no_argument, NULL, 'E' },
110 { "exports", no_argument, NULL, 'e' },
111 { NULL, 0, NULL, 0 },
112 };
113
114 /*
115 * This command queries the NFS mount daemon for it's mount list and/or
116 * it's exports list and prints them out.
117 * See "NFS: Network File System Protocol Specification, RFC1094, Appendix A"
118 * and the "Network File System Protocol XXX.."
119 * for detailed information on the protocol.
120 */
121 int
main(int argc,char ** argv)122 main(int argc, char **argv)
123 {
124 char strvised[MNTPATHLEN * 4 + 1];
125 register struct exportslist *exp;
126 register struct grouplist *grp;
127 register int rpcs = 0, mntvers = 3;
128 const char *host;
129 int ch, estat, nbytes;
130
131 while ((ch = getopt_long(argc, argv, "+adEe13", long_opts, NULL)) != -1)
132 switch (ch) {
133 case 'a':
134 if (type == 0) {
135 type = ALL;
136 rpcs |= DODUMP;
137 } else
138 usage();
139 break;
140 case 'd':
141 if (type == 0) {
142 type = DIRS;
143 rpcs |= DODUMP;
144 } else
145 usage();
146 break;
147 case 'E':
148 rpcs |= DOPARSABLEEXPORTS;
149 break;
150 case 'e':
151 rpcs |= DOEXPORTS;
152 break;
153 case '1':
154 mntvers = 1;
155 break;
156 case '3':
157 mntvers = 3;
158 break;
159 case '?':
160 default:
161 usage();
162 }
163 argc -= optind;
164 argv += optind;
165
166 if ((rpcs & DOPARSABLEEXPORTS) != 0) {
167 if ((rpcs & DOEXPORTS) != 0)
168 errx(1, "-E cannot be used with -e");
169 if ((rpcs & DODUMP) != 0)
170 errx(1, "-E cannot be used with -a or -d");
171 }
172
173 if (argc > 0)
174 host = *argv;
175 else
176 host = "localhost";
177
178 if (rpcs == 0)
179 rpcs = DODUMP;
180
181 if (rpcs & DODUMP)
182 if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
183 MOUNTPROC_DUMP, (xdrproc_t)xdr_void, (char *)0,
184 (xdrproc_t)xdr_mntdump, (char *)&mntdump)) != 0) {
185 clnt_perrno(estat);
186 errx(1, "can't do mountdump rpc");
187 }
188 if (rpcs & (DOEXPORTS | DOPARSABLEEXPORTS))
189 if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
190 MOUNTPROC_EXPORT, (xdrproc_t)xdr_void, (char *)0,
191 (xdrproc_t)xdr_exportslist, (char *)&exportslist)) != 0) {
192 clnt_perrno(estat);
193 errx(1, "can't do exports rpc");
194 }
195
196 /* Now just print out the results */
197 if (rpcs & DODUMP) {
198 switch (type) {
199 case ALL:
200 printf("All mount points on %s:\n", host);
201 break;
202 case DIRS:
203 printf("Directories on %s:\n", host);
204 break;
205 default:
206 printf("Hosts on %s:\n", host);
207 break;
208 }
209 print_dump(mntdump);
210 }
211 if (rpcs & DOEXPORTS) {
212 printf("Exports list on %s:\n", host);
213 exp = exportslist;
214 while (exp) {
215 printf("%-34s ", exp->ex_dirp);
216 grp = exp->ex_groups;
217 if (grp == NULL) {
218 printf("Everyone\n");
219 } else {
220 while (grp) {
221 printf("%s ", grp->gr_name);
222 grp = grp->gr_next;
223 }
224 printf("\n");
225 }
226 exp = exp->ex_next;
227 }
228 }
229 if (rpcs & DOPARSABLEEXPORTS) {
230 exp = exportslist;
231 while (exp) {
232 nbytes = strsnvis(strvised, sizeof(strvised),
233 exp->ex_dirp, VIS_GLOB | VIS_NL, "\"'$");
234 if (nbytes == -1)
235 err(1, "strsnvis");
236 printf("%s\n", strvised);
237 exp = exp->ex_next;
238 }
239 }
240 exit(0);
241 }
242
243 /*
244 * tcp_callrpc has the same interface as callrpc, but tries to
245 * use tcp as transport method in order to handle large replies.
246 */
247 int
tcp_callrpc(const char * host,int prognum,int versnum,int procnum,xdrproc_t inproc,char * in,xdrproc_t outproc,char * out)248 tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
249 xdrproc_t inproc, char *in, xdrproc_t outproc, char *out)
250 {
251 CLIENT *client;
252 struct timeval timeout;
253 int rval;
254
255 if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL &&
256 (client = clnt_create(host, prognum, versnum, "udp")) == NULL)
257 return ((int) rpc_createerr.cf_stat);
258
259 timeout.tv_sec = 25;
260 timeout.tv_usec = 0;
261 rval = (int) clnt_call(client, procnum,
262 inproc, in,
263 outproc, out,
264 timeout);
265 clnt_destroy(client);
266 return rval;
267 }
268
269 /*
270 * Xdr routine for retrieving the mount dump list
271 */
272 int
xdr_mntdump(XDR * xdrsp,struct mountlist ** mlp)273 xdr_mntdump(XDR *xdrsp, struct mountlist **mlp)
274 {
275 register struct mountlist *mp;
276 register struct mountlist *tp;
277 register struct mountlist **otp;
278 int val, val2;
279 int bool;
280 char *strp;
281
282 *mlp = (struct mountlist *)0;
283 if (!xdr_bool(xdrsp, &bool))
284 return (0);
285 while (bool) {
286 mp = (struct mountlist *)malloc(sizeof(struct mountlist));
287 if (mp == NULL)
288 return (0);
289 mp->ml_left = mp->ml_right = (struct mountlist *)0;
290 strp = mp->ml_host;
291 if (!xdr_string(xdrsp, &strp, MNTNAMLEN)) {
292 free(mp);
293 return (0);
294 }
295 strp = mp->ml_dirp;
296 if (!xdr_string(xdrsp, &strp, MNTPATHLEN)) {
297 free(mp);
298 return (0);
299 }
300
301 /*
302 * Build a binary tree on sorted order of either host or dirp.
303 * Drop any duplications.
304 */
305 if (*mlp == NULL) {
306 *mlp = mp;
307 } else {
308 tp = *mlp;
309 while (tp) {
310 val = strcmp(mp->ml_host, tp->ml_host);
311 val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
312 switch (type) {
313 case ALL:
314 if (val == 0) {
315 if (val2 == 0) {
316 free((caddr_t)mp);
317 goto next;
318 }
319 val = val2;
320 }
321 break;
322 case DIRS:
323 if (val2 == 0) {
324 free((caddr_t)mp);
325 goto next;
326 }
327 val = val2;
328 break;
329 default:
330 if (val == 0) {
331 free((caddr_t)mp);
332 goto next;
333 }
334 break;
335 }
336 if (val < 0) {
337 otp = &tp->ml_left;
338 tp = tp->ml_left;
339 } else {
340 otp = &tp->ml_right;
341 tp = tp->ml_right;
342 }
343 }
344 *otp = mp;
345 }
346 next:
347 if (!xdr_bool(xdrsp, &bool))
348 return (0);
349 }
350 return (1);
351 }
352
353 /*
354 * Xdr routine to retrieve exports list
355 */
356 int
xdr_exportslist(XDR * xdrsp,struct exportslist ** exp)357 xdr_exportslist(XDR *xdrsp, struct exportslist **exp)
358 {
359 register struct exportslist *ep;
360 register struct grouplist *gp;
361 int bool, grpbool;
362 char *strp;
363
364 *exp = (struct exportslist *)0;
365 if (!xdr_bool(xdrsp, &bool))
366 return (0);
367 while (bool) {
368 ep = (struct exportslist *)malloc(sizeof(struct exportslist));
369 if (ep == NULL)
370 return (0);
371 ep->ex_groups = (struct grouplist *)0;
372 strp = ep->ex_dirp;
373 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
374 return (0);
375 if (!xdr_bool(xdrsp, &grpbool))
376 return (0);
377 while (grpbool) {
378 gp = (struct grouplist *)malloc(sizeof(struct grouplist));
379 if (gp == NULL)
380 return (0);
381 strp = gp->gr_name;
382 if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
383 return (0);
384 gp->gr_next = ep->ex_groups;
385 ep->ex_groups = gp;
386 if (!xdr_bool(xdrsp, &grpbool))
387 return (0);
388 }
389 ep->ex_next = *exp;
390 *exp = ep;
391 if (!xdr_bool(xdrsp, &bool))
392 return (0);
393 }
394 return (1);
395 }
396
397 static void
usage(void)398 usage(void)
399 {
400 fprintf(stderr, "usage: showmount [-a | -d] [-e3] [host]\n");
401 exit(1);
402 }
403
404 /*
405 * Print the binary tree in inorder so that output is sorted.
406 */
407 void
print_dump(struct mountlist * mp)408 print_dump(struct mountlist *mp)
409 {
410
411 if (mp == NULL)
412 return;
413 if (mp->ml_left)
414 print_dump(mp->ml_left);
415 switch (type) {
416 case ALL:
417 printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
418 break;
419 case DIRS:
420 printf("%s\n", mp->ml_dirp);
421 break;
422 default:
423 printf("%s\n", mp->ml_host);
424 break;
425 }
426 if (mp->ml_right)
427 print_dump(mp->ml_right);
428 }
429