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 #include <sys/types.h>
36 #include <sys/queue.h>
37 #include <sys/file.h>
38 #include <sys/socket.h>
39 #include <sys/socketvar.h>
40
41 #include <err.h>
42 #include <getopt.h>
43 #include <netdb.h>
44 #include <rpc/rpc.h>
45 #include <rpc/pmap_clnt.h>
46 #include <rpc/pmap_prot.h>
47 #include <rpcsvc/mount.h>
48
49 #include <stdio.h>
50 #include <stdlib.h>
51 #include <string.h>
52 #include <unistd.h>
53 #include <vis.h>
54
55 /* Constant defs */
56 #define ALL 1
57 #define DIRS 2
58
59 #define DODUMP 0x1
60 #define DOEXPORTS 0x2
61 #define DOPARSABLEEXPORTS 0x4
62
63 struct mountlist {
64 struct mountlist *ml_left;
65 struct mountlist *ml_right;
66 char ml_host[MNTNAMLEN+1];
67 char ml_dirp[MNTPATHLEN+1];
68 };
69
70 struct grouplist {
71 struct grouplist *gr_next;
72 char gr_name[MNTNAMLEN+1];
73 };
74
75 struct exportslist {
76 struct exportslist *ex_next;
77 struct grouplist *ex_groups;
78 char ex_dirp[MNTPATHLEN+1];
79 };
80
81 static struct mountlist *mntdump;
82 static struct exportslist *exportslist;
83 static int type = 0;
84
85 void print_dump(struct mountlist *);
86 static void usage(void) __dead2;
87 int xdr_mntdump(XDR *, struct mountlist **);
88 int xdr_exportslist(XDR *, struct exportslist **);
89 int tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
90 xdrproc_t inproc, char *in, xdrproc_t outproc, char *out);
91
92 static const struct option long_opts[] = {
93 { "all", no_argument, NULL, 'a' },
94 { "directories", no_argument, NULL, 'd' },
95 { "exports-script", no_argument, NULL, 'E' },
96 { "exports", no_argument, NULL, 'e' },
97 { NULL, 0, NULL, 0 },
98 };
99
100 /*
101 * This command queries the NFS mount daemon for it's mount list and/or
102 * it's exports list and prints them out.
103 * See "NFS: Network File System Protocol Specification, RFC1094, Appendix A"
104 * and the "Network File System Protocol XXX.."
105 * for detailed information on the protocol.
106 */
107 int
main(int argc,char ** argv)108 main(int argc, char **argv)
109 {
110 char strvised[MNTPATHLEN * 4 + 1];
111 register struct exportslist *exp;
112 register struct grouplist *grp;
113 register int rpcs = 0, mntvers = 3;
114 const char *host;
115 int ch, estat, nbytes;
116
117 while ((ch = getopt_long(argc, argv, "+adEe13", long_opts, NULL)) != -1)
118 switch (ch) {
119 case 'a':
120 if (type == 0) {
121 type = ALL;
122 rpcs |= DODUMP;
123 } else
124 usage();
125 break;
126 case 'd':
127 if (type == 0) {
128 type = DIRS;
129 rpcs |= DODUMP;
130 } else
131 usage();
132 break;
133 case 'E':
134 rpcs |= DOPARSABLEEXPORTS;
135 break;
136 case 'e':
137 rpcs |= DOEXPORTS;
138 break;
139 case '1':
140 mntvers = 1;
141 break;
142 case '3':
143 mntvers = 3;
144 break;
145 case '?':
146 default:
147 usage();
148 }
149 argc -= optind;
150 argv += optind;
151
152 if ((rpcs & DOPARSABLEEXPORTS) != 0) {
153 if ((rpcs & DOEXPORTS) != 0)
154 errx(1, "-E cannot be used with -e");
155 if ((rpcs & DODUMP) != 0)
156 errx(1, "-E cannot be used with -a or -d");
157 }
158
159 if (argc > 0)
160 host = *argv;
161 else
162 host = "localhost";
163
164 if (rpcs == 0)
165 rpcs = DODUMP;
166
167 if (rpcs & DODUMP)
168 if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
169 MOUNTPROC_DUMP, (xdrproc_t)xdr_void, (char *)0,
170 (xdrproc_t)xdr_mntdump, (char *)&mntdump)) != 0) {
171 clnt_perrno(estat);
172 errx(1, "can't do mountdump rpc");
173 }
174 if (rpcs & (DOEXPORTS | DOPARSABLEEXPORTS))
175 if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
176 MOUNTPROC_EXPORT, (xdrproc_t)xdr_void, (char *)0,
177 (xdrproc_t)xdr_exportslist, (char *)&exportslist)) != 0) {
178 clnt_perrno(estat);
179 errx(1, "can't do exports rpc");
180 }
181
182 /* Now just print out the results */
183 if (rpcs & DODUMP) {
184 switch (type) {
185 case ALL:
186 printf("All mount points on %s:\n", host);
187 break;
188 case DIRS:
189 printf("Directories on %s:\n", host);
190 break;
191 default:
192 printf("Hosts on %s:\n", host);
193 break;
194 }
195 print_dump(mntdump);
196 }
197 if (rpcs & DOEXPORTS) {
198 printf("Exports list on %s:\n", host);
199 exp = exportslist;
200 while (exp) {
201 printf("%-34s ", exp->ex_dirp);
202 grp = exp->ex_groups;
203 if (grp == NULL) {
204 printf("Everyone\n");
205 } else {
206 while (grp) {
207 printf("%s ", grp->gr_name);
208 grp = grp->gr_next;
209 }
210 printf("\n");
211 }
212 exp = exp->ex_next;
213 }
214 }
215 if (rpcs & DOPARSABLEEXPORTS) {
216 exp = exportslist;
217 while (exp) {
218 nbytes = strsnvis(strvised, sizeof(strvised),
219 exp->ex_dirp, VIS_GLOB | VIS_NL, "\"'$");
220 if (nbytes == -1)
221 err(1, "strsnvis");
222 printf("%s\n", strvised);
223 exp = exp->ex_next;
224 }
225 }
226 exit(0);
227 }
228
229 /*
230 * tcp_callrpc has the same interface as callrpc, but tries to
231 * use tcp as transport method in order to handle large replies.
232 */
233 int
tcp_callrpc(const char * host,int prognum,int versnum,int procnum,xdrproc_t inproc,char * in,xdrproc_t outproc,char * out)234 tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
235 xdrproc_t inproc, char *in, xdrproc_t outproc, char *out)
236 {
237 CLIENT *client;
238 struct timeval timeout;
239 int rval;
240
241 if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL &&
242 (client = clnt_create(host, prognum, versnum, "udp")) == NULL)
243 return ((int) rpc_createerr.cf_stat);
244
245 timeout.tv_sec = 25;
246 timeout.tv_usec = 0;
247 rval = (int) clnt_call(client, procnum,
248 inproc, in,
249 outproc, out,
250 timeout);
251 clnt_destroy(client);
252 return rval;
253 }
254
255 /*
256 * Xdr routine for retrieving the mount dump list
257 */
258 int
xdr_mntdump(XDR * xdrsp,struct mountlist ** mlp)259 xdr_mntdump(XDR *xdrsp, struct mountlist **mlp)
260 {
261 register struct mountlist *mp;
262 register struct mountlist *tp;
263 register struct mountlist **otp;
264 int val, val2;
265 int bool;
266 char *strp;
267
268 *mlp = (struct mountlist *)0;
269 if (!xdr_bool(xdrsp, &bool))
270 return (0);
271 while (bool) {
272 mp = (struct mountlist *)malloc(sizeof(struct mountlist));
273 if (mp == NULL)
274 return (0);
275 mp->ml_left = mp->ml_right = (struct mountlist *)0;
276 strp = mp->ml_host;
277 if (!xdr_string(xdrsp, &strp, MNTNAMLEN)) {
278 free(mp);
279 return (0);
280 }
281 strp = mp->ml_dirp;
282 if (!xdr_string(xdrsp, &strp, MNTPATHLEN)) {
283 free(mp);
284 return (0);
285 }
286
287 /*
288 * Build a binary tree on sorted order of either host or dirp.
289 * Drop any duplications.
290 */
291 if (*mlp == NULL) {
292 *mlp = mp;
293 } else {
294 tp = *mlp;
295 while (tp) {
296 val = strcmp(mp->ml_host, tp->ml_host);
297 val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
298 switch (type) {
299 case ALL:
300 if (val == 0) {
301 if (val2 == 0) {
302 free((caddr_t)mp);
303 goto next;
304 }
305 val = val2;
306 }
307 break;
308 case DIRS:
309 if (val2 == 0) {
310 free((caddr_t)mp);
311 goto next;
312 }
313 val = val2;
314 break;
315 default:
316 if (val == 0) {
317 free((caddr_t)mp);
318 goto next;
319 }
320 break;
321 }
322 if (val < 0) {
323 otp = &tp->ml_left;
324 tp = tp->ml_left;
325 } else {
326 otp = &tp->ml_right;
327 tp = tp->ml_right;
328 }
329 }
330 *otp = mp;
331 }
332 next:
333 if (!xdr_bool(xdrsp, &bool))
334 return (0);
335 }
336 return (1);
337 }
338
339 /*
340 * Xdr routine to retrieve exports list
341 */
342 int
xdr_exportslist(XDR * xdrsp,struct exportslist ** exp)343 xdr_exportslist(XDR *xdrsp, struct exportslist **exp)
344 {
345 register struct exportslist *ep;
346 register struct grouplist *gp;
347 int bool, grpbool;
348 char *strp;
349
350 *exp = (struct exportslist *)0;
351 if (!xdr_bool(xdrsp, &bool))
352 return (0);
353 while (bool) {
354 ep = (struct exportslist *)malloc(sizeof(struct exportslist));
355 if (ep == NULL)
356 return (0);
357 ep->ex_groups = (struct grouplist *)0;
358 strp = ep->ex_dirp;
359 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
360 return (0);
361 if (!xdr_bool(xdrsp, &grpbool))
362 return (0);
363 while (grpbool) {
364 gp = (struct grouplist *)malloc(sizeof(struct grouplist));
365 if (gp == NULL)
366 return (0);
367 strp = gp->gr_name;
368 if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
369 return (0);
370 gp->gr_next = ep->ex_groups;
371 ep->ex_groups = gp;
372 if (!xdr_bool(xdrsp, &grpbool))
373 return (0);
374 }
375 ep->ex_next = *exp;
376 *exp = ep;
377 if (!xdr_bool(xdrsp, &bool))
378 return (0);
379 }
380 return (1);
381 }
382
383 static void
usage(void)384 usage(void)
385 {
386 fprintf(stderr, "usage: showmount [-a | -d] [-e3] [host]\n");
387 exit(1);
388 }
389
390 /*
391 * Print the binary tree in inorder so that output is sorted.
392 */
393 void
print_dump(struct mountlist * mp)394 print_dump(struct mountlist *mp)
395 {
396
397 if (mp == NULL)
398 return;
399 if (mp->ml_left)
400 print_dump(mp->ml_left);
401 switch (type) {
402 case ALL:
403 printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
404 break;
405 case DIRS:
406 printf("%s\n", mp->ml_dirp);
407 break;
408 default:
409 printf("%s\n", mp->ml_host);
410 break;
411 }
412 if (mp->ml_right)
413 print_dump(mp->ml_right);
414 }
415