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 #endif /* not lint */
46
47 #include <sys/types.h>
48 #include <sys/queue.h>
49 #include <sys/file.h>
50 #include <sys/socket.h>
51 #include <sys/socketvar.h>
52
53 #include <err.h>
54 #include <getopt.h>
55 #include <netdb.h>
56 #include <rpc/rpc.h>
57 #include <rpc/pmap_clnt.h>
58 #include <rpc/pmap_prot.h>
59 #include <rpcsvc/mount.h>
60
61 #include <stdio.h>
62 #include <stdlib.h>
63 #include <string.h>
64 #include <unistd.h>
65 #include <vis.h>
66
67 /* Constant defs */
68 #define ALL 1
69 #define DIRS 2
70
71 #define DODUMP 0x1
72 #define DOEXPORTS 0x2
73 #define DOPARSABLEEXPORTS 0x4
74
75 struct mountlist {
76 struct mountlist *ml_left;
77 struct mountlist *ml_right;
78 char ml_host[MNTNAMLEN+1];
79 char ml_dirp[MNTPATHLEN+1];
80 };
81
82 struct grouplist {
83 struct grouplist *gr_next;
84 char gr_name[MNTNAMLEN+1];
85 };
86
87 struct exportslist {
88 struct exportslist *ex_next;
89 struct grouplist *ex_groups;
90 char ex_dirp[MNTPATHLEN+1];
91 };
92
93 static struct mountlist *mntdump;
94 static struct exportslist *exportslist;
95 static int type = 0;
96
97 void print_dump(struct mountlist *);
98 static void usage(void) __dead2;
99 int xdr_mntdump(XDR *, struct mountlist **);
100 int xdr_exportslist(XDR *, struct exportslist **);
101 int tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
102 xdrproc_t inproc, char *in, xdrproc_t outproc, char *out);
103
104 static const struct option long_opts[] = {
105 { "all", no_argument, NULL, 'a' },
106 { "directories", no_argument, NULL, 'd' },
107 { "exports-script", no_argument, NULL, 'E' },
108 { "exports", no_argument, NULL, 'e' },
109 { NULL, 0, NULL, 0 },
110 };
111
112 /*
113 * This command queries the NFS mount daemon for it's mount list and/or
114 * it's exports list and prints them out.
115 * See "NFS: Network File System Protocol Specification, RFC1094, Appendix A"
116 * and the "Network File System Protocol XXX.."
117 * for detailed information on the protocol.
118 */
119 int
main(int argc,char ** argv)120 main(int argc, char **argv)
121 {
122 char strvised[MNTPATHLEN * 4 + 1];
123 register struct exportslist *exp;
124 register struct grouplist *grp;
125 register int rpcs = 0, mntvers = 3;
126 const char *host;
127 int ch, estat, nbytes;
128
129 while ((ch = getopt_long(argc, argv, "+adEe13", long_opts, NULL)) != -1)
130 switch (ch) {
131 case 'a':
132 if (type == 0) {
133 type = ALL;
134 rpcs |= DODUMP;
135 } else
136 usage();
137 break;
138 case 'd':
139 if (type == 0) {
140 type = DIRS;
141 rpcs |= DODUMP;
142 } else
143 usage();
144 break;
145 case 'E':
146 rpcs |= DOPARSABLEEXPORTS;
147 break;
148 case 'e':
149 rpcs |= DOEXPORTS;
150 break;
151 case '1':
152 mntvers = 1;
153 break;
154 case '3':
155 mntvers = 3;
156 break;
157 case '?':
158 default:
159 usage();
160 }
161 argc -= optind;
162 argv += optind;
163
164 if ((rpcs & DOPARSABLEEXPORTS) != 0) {
165 if ((rpcs & DOEXPORTS) != 0)
166 errx(1, "-E cannot be used with -e");
167 if ((rpcs & DODUMP) != 0)
168 errx(1, "-E cannot be used with -a or -d");
169 }
170
171 if (argc > 0)
172 host = *argv;
173 else
174 host = "localhost";
175
176 if (rpcs == 0)
177 rpcs = DODUMP;
178
179 if (rpcs & DODUMP)
180 if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
181 MOUNTPROC_DUMP, (xdrproc_t)xdr_void, (char *)0,
182 (xdrproc_t)xdr_mntdump, (char *)&mntdump)) != 0) {
183 clnt_perrno(estat);
184 errx(1, "can't do mountdump rpc");
185 }
186 if (rpcs & (DOEXPORTS | DOPARSABLEEXPORTS))
187 if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
188 MOUNTPROC_EXPORT, (xdrproc_t)xdr_void, (char *)0,
189 (xdrproc_t)xdr_exportslist, (char *)&exportslist)) != 0) {
190 clnt_perrno(estat);
191 errx(1, "can't do exports rpc");
192 }
193
194 /* Now just print out the results */
195 if (rpcs & DODUMP) {
196 switch (type) {
197 case ALL:
198 printf("All mount points on %s:\n", host);
199 break;
200 case DIRS:
201 printf("Directories on %s:\n", host);
202 break;
203 default:
204 printf("Hosts on %s:\n", host);
205 break;
206 }
207 print_dump(mntdump);
208 }
209 if (rpcs & DOEXPORTS) {
210 printf("Exports list on %s:\n", host);
211 exp = exportslist;
212 while (exp) {
213 printf("%-34s ", exp->ex_dirp);
214 grp = exp->ex_groups;
215 if (grp == NULL) {
216 printf("Everyone\n");
217 } else {
218 while (grp) {
219 printf("%s ", grp->gr_name);
220 grp = grp->gr_next;
221 }
222 printf("\n");
223 }
224 exp = exp->ex_next;
225 }
226 }
227 if (rpcs & DOPARSABLEEXPORTS) {
228 exp = exportslist;
229 while (exp) {
230 nbytes = strsnvis(strvised, sizeof(strvised),
231 exp->ex_dirp, VIS_GLOB | VIS_NL, "\"'$");
232 if (nbytes == -1)
233 err(1, "strsnvis");
234 printf("%s\n", strvised);
235 exp = exp->ex_next;
236 }
237 }
238 exit(0);
239 }
240
241 /*
242 * tcp_callrpc has the same interface as callrpc, but tries to
243 * use tcp as transport method in order to handle large replies.
244 */
245 int
tcp_callrpc(const char * host,int prognum,int versnum,int procnum,xdrproc_t inproc,char * in,xdrproc_t outproc,char * out)246 tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
247 xdrproc_t inproc, char *in, xdrproc_t outproc, char *out)
248 {
249 CLIENT *client;
250 struct timeval timeout;
251 int rval;
252
253 if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL &&
254 (client = clnt_create(host, prognum, versnum, "udp")) == NULL)
255 return ((int) rpc_createerr.cf_stat);
256
257 timeout.tv_sec = 25;
258 timeout.tv_usec = 0;
259 rval = (int) clnt_call(client, procnum,
260 inproc, in,
261 outproc, out,
262 timeout);
263 clnt_destroy(client);
264 return rval;
265 }
266
267 /*
268 * Xdr routine for retrieving the mount dump list
269 */
270 int
xdr_mntdump(XDR * xdrsp,struct mountlist ** mlp)271 xdr_mntdump(XDR *xdrsp, struct mountlist **mlp)
272 {
273 register struct mountlist *mp;
274 register struct mountlist *tp;
275 register struct mountlist **otp;
276 int val, val2;
277 int bool;
278 char *strp;
279
280 *mlp = (struct mountlist *)0;
281 if (!xdr_bool(xdrsp, &bool))
282 return (0);
283 while (bool) {
284 mp = (struct mountlist *)malloc(sizeof(struct mountlist));
285 if (mp == NULL)
286 return (0);
287 mp->ml_left = mp->ml_right = (struct mountlist *)0;
288 strp = mp->ml_host;
289 if (!xdr_string(xdrsp, &strp, MNTNAMLEN)) {
290 free(mp);
291 return (0);
292 }
293 strp = mp->ml_dirp;
294 if (!xdr_string(xdrsp, &strp, MNTPATHLEN)) {
295 free(mp);
296 return (0);
297 }
298
299 /*
300 * Build a binary tree on sorted order of either host or dirp.
301 * Drop any duplications.
302 */
303 if (*mlp == NULL) {
304 *mlp = mp;
305 } else {
306 tp = *mlp;
307 while (tp) {
308 val = strcmp(mp->ml_host, tp->ml_host);
309 val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
310 switch (type) {
311 case ALL:
312 if (val == 0) {
313 if (val2 == 0) {
314 free((caddr_t)mp);
315 goto next;
316 }
317 val = val2;
318 }
319 break;
320 case DIRS:
321 if (val2 == 0) {
322 free((caddr_t)mp);
323 goto next;
324 }
325 val = val2;
326 break;
327 default:
328 if (val == 0) {
329 free((caddr_t)mp);
330 goto next;
331 }
332 break;
333 }
334 if (val < 0) {
335 otp = &tp->ml_left;
336 tp = tp->ml_left;
337 } else {
338 otp = &tp->ml_right;
339 tp = tp->ml_right;
340 }
341 }
342 *otp = mp;
343 }
344 next:
345 if (!xdr_bool(xdrsp, &bool))
346 return (0);
347 }
348 return (1);
349 }
350
351 /*
352 * Xdr routine to retrieve exports list
353 */
354 int
xdr_exportslist(XDR * xdrsp,struct exportslist ** exp)355 xdr_exportslist(XDR *xdrsp, struct exportslist **exp)
356 {
357 register struct exportslist *ep;
358 register struct grouplist *gp;
359 int bool, grpbool;
360 char *strp;
361
362 *exp = (struct exportslist *)0;
363 if (!xdr_bool(xdrsp, &bool))
364 return (0);
365 while (bool) {
366 ep = (struct exportslist *)malloc(sizeof(struct exportslist));
367 if (ep == NULL)
368 return (0);
369 ep->ex_groups = (struct grouplist *)0;
370 strp = ep->ex_dirp;
371 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
372 return (0);
373 if (!xdr_bool(xdrsp, &grpbool))
374 return (0);
375 while (grpbool) {
376 gp = (struct grouplist *)malloc(sizeof(struct grouplist));
377 if (gp == NULL)
378 return (0);
379 strp = gp->gr_name;
380 if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
381 return (0);
382 gp->gr_next = ep->ex_groups;
383 ep->ex_groups = gp;
384 if (!xdr_bool(xdrsp, &grpbool))
385 return (0);
386 }
387 ep->ex_next = *exp;
388 *exp = ep;
389 if (!xdr_bool(xdrsp, &bool))
390 return (0);
391 }
392 return (1);
393 }
394
395 static void
usage(void)396 usage(void)
397 {
398 fprintf(stderr, "usage: showmount [-a | -d] [-e3] [host]\n");
399 exit(1);
400 }
401
402 /*
403 * Print the binary tree in inorder so that output is sorted.
404 */
405 void
print_dump(struct mountlist * mp)406 print_dump(struct mountlist *mp)
407 {
408
409 if (mp == NULL)
410 return;
411 if (mp->ml_left)
412 print_dump(mp->ml_left);
413 switch (type) {
414 case ALL:
415 printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
416 break;
417 case DIRS:
418 printf("%s\n", mp->ml_dirp);
419 break;
420 default:
421 printf("%s\n", mp->ml_host);
422 break;
423 }
424 if (mp->ml_right)
425 print_dump(mp->ml_right);
426 }
427