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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(argc, argv)
114         int argc;
115         char **argv;
116 {
117         register struct exportslist *exp;
118         register struct grouplist *grp;
119         register int rpcs = 0, mntvers = 1;
120         const char *host;
121         int ch, estat;
122
123         while ((ch = getopt(argc, argv, "ade3")) != -1)
124                 switch (ch) {
125                 case 'a':
126                         if (type == 0) {
127                                 type = ALL;
128                                 rpcs |= DODUMP;
129                         } else
130                                 usage();
131                         break;
132                 case 'd':
133                         if (type == 0) {
134                                 type = DIRS;
135                                 rpcs |= DODUMP;
136                         } else
137                                 usage();
138                         break;
139                 case 'e':
140                         rpcs |= DOEXPORTS;
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 (argc > 0)
153                 host = *argv;
154         else
155                 host = "localhost";
156
157         if (rpcs == 0)
158                 rpcs = DODUMP;
159
160         if (rpcs & DODUMP)
161                 if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
162                         MOUNTPROC_DUMP, (xdrproc_t)xdr_void, (char *)0,
163                         (xdrproc_t)xdr_mntdump, (char *)&mntdump)) != 0) {
164                         clnt_perrno(estat);
165                         errx(1, "can't do mountdump rpc");
166                 }
167         if (rpcs & DOEXPORTS)
168                 if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
169                         MOUNTPROC_EXPORT, (xdrproc_t)xdr_void, (char *)0,
170                         (xdrproc_t)xdr_exportslist, (char *)&exportslist)) != 0) {
171                         clnt_perrno(estat);
172                         errx(1, "can't do exports rpc");
173                 }
174
175         /* Now just print out the results */
176         if (rpcs & DODUMP) {
177                 switch (type) {
178                 case ALL:
179                         printf("All mount points on %s:\n", host);
180                         break;
181                 case DIRS:
182                         printf("Directories on %s:\n", host);
183                         break;
184                 default:
185                         printf("Hosts on %s:\n", host);
186                         break;
187                 };
188                 print_dump(mntdump);
189         }
190         if (rpcs & DOEXPORTS) {
191                 printf("Exports list on %s:\n", host);
192                 exp = exportslist;
193                 while (exp) {
194                         printf("%-35s", exp->ex_dirp);
195                         grp = exp->ex_groups;
196                         if (grp == NULL) {
197                                 printf("Everyone\n");
198                         } else {
199                                 while (grp) {
200                                         printf("%s ", grp->gr_name);
201                                         grp = grp->gr_next;
202                                 }
203                                 printf("\n");
204                         }
205                         exp = exp->ex_next;
206                 }
207         }
208         exit(0);
209 }
210
211 /*
212  * tcp_callrpc has the same interface as callrpc, but tries to
213  * use tcp as transport method in order to handle large replies.
214  */
215 int 
216 tcp_callrpc(host, prognum, versnum, procnum, inproc, in, outproc, out)
217         const char *host;
218         int prognum;
219         int versnum;
220         int procnum;
221         xdrproc_t inproc;
222         char *in;
223         xdrproc_t outproc;
224         char *out;
225 {
226         CLIENT *client;
227         struct timeval timeout;
228         int rval;
229
230         if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL &&
231             (client = clnt_create(host, prognum, versnum, "udp")) == NULL)
232                 return ((int) rpc_createerr.cf_stat);
233
234         timeout.tv_sec = 25;
235         timeout.tv_usec = 0;
236         rval = (int) clnt_call(client, procnum, 
237                                inproc, in,
238                                outproc, out,
239                                timeout);
240         clnt_destroy(client);
241         return rval;
242 }
243
244 /*
245  * Xdr routine for retrieving the mount dump list
246  */
247 int
248 xdr_mntdump(xdrsp, mlp)
249         XDR *xdrsp;
250         struct mountlist **mlp;
251 {
252         register struct mountlist *mp;
253         register struct mountlist *tp;
254         register struct mountlist **otp;
255         int val, val2;
256         int bool;
257         char *strp;
258
259         *mlp = (struct mountlist *)0;
260         if (!xdr_bool(xdrsp, &bool))
261                 return (0);
262         while (bool) {
263                 mp = (struct mountlist *)malloc(sizeof(struct mountlist));
264                 if (mp == NULL)
265                         return (0);
266                 mp->ml_left = mp->ml_right = (struct mountlist *)0;
267                 strp = mp->ml_host;
268                 if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
269                         return (0);
270                 strp = mp->ml_dirp;
271                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
272                         return (0);
273
274                 /*
275                  * Build a binary tree on sorted order of either host or dirp.
276                  * Drop any duplications.
277                  */
278                 if (*mlp == NULL) {
279                         *mlp = mp;
280                 } else {
281                         tp = *mlp;
282                         while (tp) {
283                                 val = strcmp(mp->ml_host, tp->ml_host);
284                                 val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
285                                 switch (type) {
286                                 case ALL:
287                                         if (val == 0) {
288                                                 if (val2 == 0) {
289                                                         free((caddr_t)mp);
290                                                         goto next;
291                                                 }
292                                                 val = val2;
293                                         }
294                                         break;
295                                 case DIRS:
296                                         if (val2 == 0) {
297                                                 free((caddr_t)mp);
298                                                 goto next;
299                                         }
300                                         val = val2;
301                                         break;
302                                 default:
303                                         if (val == 0) {
304                                                 free((caddr_t)mp);
305                                                 goto next;
306                                         }
307                                         break;
308                                 };
309                                 if (val < 0) {
310                                         otp = &tp->ml_left;
311                                         tp = tp->ml_left;
312                                 } else {
313                                         otp = &tp->ml_right;
314                                         tp = tp->ml_right;
315                                 }
316                         }
317                         *otp = mp;
318                 }
319 next:
320                 if (!xdr_bool(xdrsp, &bool))
321                         return (0);
322         }
323         return (1);
324 }
325
326 /*
327  * Xdr routine to retrieve exports list
328  */
329 int
330 xdr_exportslist(xdrsp, exp)
331         XDR *xdrsp;
332         struct exportslist **exp;
333 {
334         register struct exportslist *ep;
335         register struct grouplist *gp;
336         int bool, grpbool;
337         char *strp;
338
339         *exp = (struct exportslist *)0;
340         if (!xdr_bool(xdrsp, &bool))
341                 return (0);
342         while (bool) {
343                 ep = (struct exportslist *)malloc(sizeof(struct exportslist));
344                 if (ep == NULL)
345                         return (0);
346                 ep->ex_groups = (struct grouplist *)0;
347                 strp = ep->ex_dirp;
348                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
349                         return (0);
350                 if (!xdr_bool(xdrsp, &grpbool))
351                         return (0);
352                 while (grpbool) {
353                         gp = (struct grouplist *)malloc(sizeof(struct grouplist));
354                         if (gp == NULL)
355                                 return (0);
356                         strp = gp->gr_name;
357                         if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
358                                 return (0);
359                         gp->gr_next = ep->ex_groups;
360                         ep->ex_groups = gp;
361                         if (!xdr_bool(xdrsp, &grpbool))
362                                 return (0);
363                 }
364                 ep->ex_next = *exp;
365                 *exp = ep;
366                 if (!xdr_bool(xdrsp, &bool))
367                         return (0);
368         }
369         return (1);
370 }
371
372 static void
373 usage()
374 {
375         fprintf(stderr, "usage: showmount [-a | -d] [-e3] [host]\n");
376         exit(1);
377 }
378
379 /*
380  * Print the binary tree in inorder so that output is sorted.
381  */
382 void
383 print_dump(mp)
384         struct mountlist *mp;
385 {
386
387         if (mp == NULL)
388                 return;
389         if (mp->ml_left)
390                 print_dump(mp->ml_left);
391         switch (type) {
392         case ALL:
393                 printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
394                 break;
395         case DIRS:
396                 printf("%s\n", mp->ml_dirp);
397                 break;
398         default:
399                 printf("%s\n", mp->ml_host);
400                 break;
401         };
402         if (mp->ml_right)
403                 print_dump(mp->ml_right);
404 }