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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  * 3. All advertising materials mentioning features or use of this software
17  *    must display the following acknowledgement:
18  *      This product includes software developed by the University of
19  *      California, Berkeley and its contributors.
20  * 4. Neither the name of the University nor the names of its contributors
21  *    may be used to endorse or promote products derived from this software
22  *    without specific prior written permission.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34  * SUCH DAMAGE.
35  */
36
37 #ifndef lint
38 static const char copyright[] =
39 "@(#) Copyright (c) 1989, 1993, 1995\n\
40         The Regents of the University of California.  All rights reserved.\n";
41 #endif /* not lint */
42
43 #ifndef lint
44 #if 0
45 static char sccsid[] = "@(#)showmount.c 8.3 (Berkeley) 3/29/95";
46 #endif
47 static const char rcsid[] =
48   "$FreeBSD$";
49 #endif /* not lint */
50
51 #include <sys/types.h>
52 #include <sys/queue.h>
53 #include <sys/file.h>
54 #include <sys/socket.h>
55 #include <sys/socketvar.h>
56
57 #include <err.h>
58 #include <netdb.h>
59 #include <rpc/rpc.h>
60 #include <rpc/pmap_clnt.h>
61 #include <rpc/pmap_prot.h>
62 #include <rpcsvc/mount.h>
63
64 #include <stdio.h>
65 #include <stdlib.h>
66 #include <string.h>
67 #include <unistd.h>
68
69 /* Constant defs */
70 #define ALL     1
71 #define DIRS    2
72
73 #define DODUMP          0x1
74 #define DOEXPORTS       0x2
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
113 main(int argc, char **argv)
114 {
115         register struct exportslist *exp;
116         register struct grouplist *grp;
117         register int rpcs = 0, mntvers = 1;
118         const char *host;
119         int ch, estat;
120
121         while ((ch = getopt(argc, argv, "ade3")) != -1)
122                 switch (ch) {
123                 case 'a':
124                         if (type == 0) {
125                                 type = ALL;
126                                 rpcs |= DODUMP;
127                         } else
128                                 usage();
129                         break;
130                 case 'd':
131                         if (type == 0) {
132                                 type = DIRS;
133                                 rpcs |= DODUMP;
134                         } else
135                                 usage();
136                         break;
137                 case 'e':
138                         rpcs |= DOEXPORTS;
139                         break;
140                 case '3':
141                         mntvers = 3;
142                         break;
143                 case '?':
144                 default:
145                         usage();
146                 }
147         argc -= optind;
148         argv += optind;
149
150         if (argc > 0)
151                 host = *argv;
152         else
153                 host = "localhost";
154
155         if (rpcs == 0)
156                 rpcs = DODUMP;
157
158         if (rpcs & DODUMP)
159                 if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
160                         MOUNTPROC_DUMP, (xdrproc_t)xdr_void, (char *)0,
161                         (xdrproc_t)xdr_mntdump, (char *)&mntdump)) != 0) {
162                         clnt_perrno(estat);
163                         errx(1, "can't do mountdump rpc");
164                 }
165         if (rpcs & DOEXPORTS)
166                 if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
167                         MOUNTPROC_EXPORT, (xdrproc_t)xdr_void, (char *)0,
168                         (xdrproc_t)xdr_exportslist, (char *)&exportslist)) != 0) {
169                         clnt_perrno(estat);
170                         errx(1, "can't do exports rpc");
171                 }
172
173         /* Now just print out the results */
174         if (rpcs & DODUMP) {
175                 switch (type) {
176                 case ALL:
177                         printf("All mount points on %s:\n", host);
178                         break;
179                 case DIRS:
180                         printf("Directories on %s:\n", host);
181                         break;
182                 default:
183                         printf("Hosts on %s:\n", host);
184                         break;
185                 };
186                 print_dump(mntdump);
187         }
188         if (rpcs & DOEXPORTS) {
189                 printf("Exports list on %s:\n", host);
190                 exp = exportslist;
191                 while (exp) {
192                         printf("%-35s", exp->ex_dirp);
193                         grp = exp->ex_groups;
194                         if (grp == NULL) {
195                                 printf("Everyone\n");
196                         } else {
197                                 while (grp) {
198                                         printf("%s ", grp->gr_name);
199                                         grp = grp->gr_next;
200                                 }
201                                 printf("\n");
202                         }
203                         exp = exp->ex_next;
204                 }
205         }
206         exit(0);
207 }
208
209 /*
210  * tcp_callrpc has the same interface as callrpc, but tries to
211  * use tcp as transport method in order to handle large replies.
212  */
213 int 
214 tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
215     xdrproc_t inproc, char *in, xdrproc_t outproc, char *out)
216 {
217         CLIENT *client;
218         struct timeval timeout;
219         int rval;
220
221         if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL &&
222             (client = clnt_create(host, prognum, versnum, "udp")) == NULL)
223                 return ((int) rpc_createerr.cf_stat);
224
225         timeout.tv_sec = 25;
226         timeout.tv_usec = 0;
227         rval = (int) clnt_call(client, procnum, 
228                                inproc, in,
229                                outproc, out,
230                                timeout);
231         clnt_destroy(client);
232         return rval;
233 }
234
235 /*
236  * Xdr routine for retrieving the mount dump list
237  */
238 int
239 xdr_mntdump(XDR *xdrsp, struct mountlist **mlp)
240 {
241         register struct mountlist *mp;
242         register struct mountlist *tp;
243         register struct mountlist **otp;
244         int val, val2;
245         int bool;
246         char *strp;
247
248         *mlp = (struct mountlist *)0;
249         if (!xdr_bool(xdrsp, &bool))
250                 return (0);
251         while (bool) {
252                 mp = (struct mountlist *)malloc(sizeof(struct mountlist));
253                 if (mp == NULL)
254                         return (0);
255                 mp->ml_left = mp->ml_right = (struct mountlist *)0;
256                 strp = mp->ml_host;
257                 if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
258                         return (0);
259                 strp = mp->ml_dirp;
260                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
261                         return (0);
262
263                 /*
264                  * Build a binary tree on sorted order of either host or dirp.
265                  * Drop any duplications.
266                  */
267                 if (*mlp == NULL) {
268                         *mlp = mp;
269                 } else {
270                         tp = *mlp;
271                         while (tp) {
272                                 val = strcmp(mp->ml_host, tp->ml_host);
273                                 val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
274                                 switch (type) {
275                                 case ALL:
276                                         if (val == 0) {
277                                                 if (val2 == 0) {
278                                                         free((caddr_t)mp);
279                                                         goto next;
280                                                 }
281                                                 val = val2;
282                                         }
283                                         break;
284                                 case DIRS:
285                                         if (val2 == 0) {
286                                                 free((caddr_t)mp);
287                                                 goto next;
288                                         }
289                                         val = val2;
290                                         break;
291                                 default:
292                                         if (val == 0) {
293                                                 free((caddr_t)mp);
294                                                 goto next;
295                                         }
296                                         break;
297                                 };
298                                 if (val < 0) {
299                                         otp = &tp->ml_left;
300                                         tp = tp->ml_left;
301                                 } else {
302                                         otp = &tp->ml_right;
303                                         tp = tp->ml_right;
304                                 }
305                         }
306                         *otp = mp;
307                 }
308 next:
309                 if (!xdr_bool(xdrsp, &bool))
310                         return (0);
311         }
312         return (1);
313 }
314
315 /*
316  * Xdr routine to retrieve exports list
317  */
318 int
319 xdr_exportslist(XDR *xdrsp, struct exportslist **exp)
320 {
321         register struct exportslist *ep;
322         register struct grouplist *gp;
323         int bool, grpbool;
324         char *strp;
325
326         *exp = (struct exportslist *)0;
327         if (!xdr_bool(xdrsp, &bool))
328                 return (0);
329         while (bool) {
330                 ep = (struct exportslist *)malloc(sizeof(struct exportslist));
331                 if (ep == NULL)
332                         return (0);
333                 ep->ex_groups = (struct grouplist *)0;
334                 strp = ep->ex_dirp;
335                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
336                         return (0);
337                 if (!xdr_bool(xdrsp, &grpbool))
338                         return (0);
339                 while (grpbool) {
340                         gp = (struct grouplist *)malloc(sizeof(struct grouplist));
341                         if (gp == NULL)
342                                 return (0);
343                         strp = gp->gr_name;
344                         if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
345                                 return (0);
346                         gp->gr_next = ep->ex_groups;
347                         ep->ex_groups = gp;
348                         if (!xdr_bool(xdrsp, &grpbool))
349                                 return (0);
350                 }
351                 ep->ex_next = *exp;
352                 *exp = ep;
353                 if (!xdr_bool(xdrsp, &bool))
354                         return (0);
355         }
356         return (1);
357 }
358
359 static void
360 usage(void)
361 {
362         fprintf(stderr, "usage: showmount [-a | -d] [-e3] [host]\n");
363         exit(1);
364 }
365
366 /*
367  * Print the binary tree in inorder so that output is sorted.
368  */
369 void
370 print_dump(struct mountlist *mp)
371 {
372
373         if (mp == NULL)
374                 return;
375         if (mp->ml_left)
376                 print_dump(mp->ml_left);
377         switch (type) {
378         case ALL:
379                 printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
380                 break;
381         case DIRS:
382                 printf("%s\n", mp->ml_dirp);
383                 break;
384         default:
385                 printf("%s\n", mp->ml_host);
386                 break;
387         };
388         if (mp->ml_right)
389                 print_dump(mp->ml_right);
390 }