1 /*
2 * Copyright (c) 1989, 1993, 1995
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #ifndef lint
34 static const char copyright[] =
35 "@(#) Copyright (c) 1989, 1993, 1995\n\
36 The Regents of the University of California. All rights reserved.\n";
37 #endif /* not lint */
38
39 #ifndef lint
40 #if 0
41 static char sccsid[] = "@(#)showmount.c 8.3 (Berkeley) 3/29/95";
42 #endif
43 static const char rcsid[] =
44 "$FreeBSD: stable/9/usr.bin/showmount/showmount.c 222245 2011-05-24 06:56:40Z ru $";
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 <netdb.h>
55 #include <rpc/rpc.h>
56 #include <rpc/pmap_clnt.h>
57 #include <rpc/pmap_prot.h>
58 #include <rpcsvc/mount.h>
59
60 #include <stdio.h>
61 #include <stdlib.h>
62 #include <string.h>
63 #include <unistd.h>
64
65 /* Constant defs */
66 #define ALL 1
67 #define DIRS 2
68
69 #define DODUMP 0x1
70 #define DOEXPORTS 0x2
71
72 struct mountlist {
73 struct mountlist *ml_left;
74 struct mountlist *ml_right;
75 char ml_host[MNTNAMLEN+1];
76 char ml_dirp[MNTPATHLEN+1];
77 };
78
79 struct grouplist {
80 struct grouplist *gr_next;
81 char gr_name[MNTNAMLEN+1];
82 };
83
84 struct exportslist {
85 struct exportslist *ex_next;
86 struct grouplist *ex_groups;
87 char ex_dirp[MNTPATHLEN+1];
88 };
89
90 static struct mountlist *mntdump;
91 static struct exportslist *exportslist;
92 static int type = 0;
93
94 void print_dump(struct mountlist *);
95 static void usage(void);
96 int xdr_mntdump(XDR *, struct mountlist **);
97 int xdr_exportslist(XDR *, struct exportslist **);
98 int tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
99 xdrproc_t inproc, char *in, xdrproc_t outproc, char *out);
100
101 /*
102 * This command queries the NFS mount daemon for it's mount list and/or
103 * it's exports list and prints them out.
104 * See "NFS: Network File System Protocol Specification, RFC1094, Appendix A"
105 * and the "Network File System Protocol XXX.."
106 * for detailed information on the protocol.
107 */
108 int
main(int argc,char ** argv)109 main(int argc, char **argv)
110 {
111 register struct exportslist *exp;
112 register struct grouplist *grp;
113 register int rpcs = 0, mntvers = 1;
114 const char *host;
115 int ch, estat;
116
117 while ((ch = getopt(argc, argv, "ade3")) != -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 |= DOEXPORTS;
135 break;
136 case '3':
137 mntvers = 3;
138 break;
139 case '?':
140 default:
141 usage();
142 }
143 argc -= optind;
144 argv += optind;
145
146 if (argc > 0)
147 host = *argv;
148 else
149 host = "localhost";
150
151 if (rpcs == 0)
152 rpcs = DODUMP;
153
154 if (rpcs & DODUMP)
155 if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
156 MOUNTPROC_DUMP, (xdrproc_t)xdr_void, (char *)0,
157 (xdrproc_t)xdr_mntdump, (char *)&mntdump)) != 0) {
158 clnt_perrno(estat);
159 errx(1, "can't do mountdump rpc");
160 }
161 if (rpcs & DOEXPORTS)
162 if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
163 MOUNTPROC_EXPORT, (xdrproc_t)xdr_void, (char *)0,
164 (xdrproc_t)xdr_exportslist, (char *)&exportslist)) != 0) {
165 clnt_perrno(estat);
166 errx(1, "can't do exports rpc");
167 }
168
169 /* Now just print out the results */
170 if (rpcs & DODUMP) {
171 switch (type) {
172 case ALL:
173 printf("All mount points on %s:\n", host);
174 break;
175 case DIRS:
176 printf("Directories on %s:\n", host);
177 break;
178 default:
179 printf("Hosts on %s:\n", host);
180 break;
181 };
182 print_dump(mntdump);
183 }
184 if (rpcs & DOEXPORTS) {
185 printf("Exports list on %s:\n", host);
186 exp = exportslist;
187 while (exp) {
188 printf("%-34s ", exp->ex_dirp);
189 grp = exp->ex_groups;
190 if (grp == NULL) {
191 printf("Everyone\n");
192 } else {
193 while (grp) {
194 printf("%s ", grp->gr_name);
195 grp = grp->gr_next;
196 }
197 printf("\n");
198 }
199 exp = exp->ex_next;
200 }
201 }
202 exit(0);
203 }
204
205 /*
206 * tcp_callrpc has the same interface as callrpc, but tries to
207 * use tcp as transport method in order to handle large replies.
208 */
209 int
tcp_callrpc(const char * host,int prognum,int versnum,int procnum,xdrproc_t inproc,char * in,xdrproc_t outproc,char * out)210 tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
211 xdrproc_t inproc, char *in, xdrproc_t outproc, char *out)
212 {
213 CLIENT *client;
214 struct timeval timeout;
215 int rval;
216
217 if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL &&
218 (client = clnt_create(host, prognum, versnum, "udp")) == NULL)
219 return ((int) rpc_createerr.cf_stat);
220
221 timeout.tv_sec = 25;
222 timeout.tv_usec = 0;
223 rval = (int) clnt_call(client, procnum,
224 inproc, in,
225 outproc, out,
226 timeout);
227 clnt_destroy(client);
228 return rval;
229 }
230
231 /*
232 * Xdr routine for retrieving the mount dump list
233 */
234 int
xdr_mntdump(XDR * xdrsp,struct mountlist ** mlp)235 xdr_mntdump(XDR *xdrsp, struct mountlist **mlp)
236 {
237 register struct mountlist *mp;
238 register struct mountlist *tp;
239 register struct mountlist **otp;
240 int val, val2;
241 int bool;
242 char *strp;
243
244 *mlp = (struct mountlist *)0;
245 if (!xdr_bool(xdrsp, &bool))
246 return (0);
247 while (bool) {
248 mp = (struct mountlist *)malloc(sizeof(struct mountlist));
249 if (mp == NULL)
250 return (0);
251 mp->ml_left = mp->ml_right = (struct mountlist *)0;
252 strp = mp->ml_host;
253 if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
254 return (0);
255 strp = mp->ml_dirp;
256 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
257 return (0);
258
259 /*
260 * Build a binary tree on sorted order of either host or dirp.
261 * Drop any duplications.
262 */
263 if (*mlp == NULL) {
264 *mlp = mp;
265 } else {
266 tp = *mlp;
267 while (tp) {
268 val = strcmp(mp->ml_host, tp->ml_host);
269 val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
270 switch (type) {
271 case ALL:
272 if (val == 0) {
273 if (val2 == 0) {
274 free((caddr_t)mp);
275 goto next;
276 }
277 val = val2;
278 }
279 break;
280 case DIRS:
281 if (val2 == 0) {
282 free((caddr_t)mp);
283 goto next;
284 }
285 val = val2;
286 break;
287 default:
288 if (val == 0) {
289 free((caddr_t)mp);
290 goto next;
291 }
292 break;
293 };
294 if (val < 0) {
295 otp = &tp->ml_left;
296 tp = tp->ml_left;
297 } else {
298 otp = &tp->ml_right;
299 tp = tp->ml_right;
300 }
301 }
302 *otp = mp;
303 }
304 next:
305 if (!xdr_bool(xdrsp, &bool))
306 return (0);
307 }
308 return (1);
309 }
310
311 /*
312 * Xdr routine to retrieve exports list
313 */
314 int
xdr_exportslist(XDR * xdrsp,struct exportslist ** exp)315 xdr_exportslist(XDR *xdrsp, struct exportslist **exp)
316 {
317 register struct exportslist *ep;
318 register struct grouplist *gp;
319 int bool, grpbool;
320 char *strp;
321
322 *exp = (struct exportslist *)0;
323 if (!xdr_bool(xdrsp, &bool))
324 return (0);
325 while (bool) {
326 ep = (struct exportslist *)malloc(sizeof(struct exportslist));
327 if (ep == NULL)
328 return (0);
329 ep->ex_groups = (struct grouplist *)0;
330 strp = ep->ex_dirp;
331 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
332 return (0);
333 if (!xdr_bool(xdrsp, &grpbool))
334 return (0);
335 while (grpbool) {
336 gp = (struct grouplist *)malloc(sizeof(struct grouplist));
337 if (gp == NULL)
338 return (0);
339 strp = gp->gr_name;
340 if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
341 return (0);
342 gp->gr_next = ep->ex_groups;
343 ep->ex_groups = gp;
344 if (!xdr_bool(xdrsp, &grpbool))
345 return (0);
346 }
347 ep->ex_next = *exp;
348 *exp = ep;
349 if (!xdr_bool(xdrsp, &bool))
350 return (0);
351 }
352 return (1);
353 }
354
355 static void
usage(void)356 usage(void)
357 {
358 fprintf(stderr, "usage: showmount [-a | -d] [-e3] [host]\n");
359 exit(1);
360 }
361
362 /*
363 * Print the binary tree in inorder so that output is sorted.
364 */
365 void
print_dump(struct mountlist * mp)366 print_dump(struct mountlist *mp)
367 {
368
369 if (mp == NULL)
370 return;
371 if (mp->ml_left)
372 print_dump(mp->ml_left);
373 switch (type) {
374 case ALL:
375 printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
376 break;
377 case DIRS:
378 printf("%s\n", mp->ml_dirp);
379 break;
380 default:
381 printf("%s\n", mp->ml_host);
382 break;
383 };
384 if (mp->ml_right)
385 print_dump(mp->ml_right);
386 }
387