usr.bin/showmount/showmount.c

   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   "$FreeBSD$";
  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
 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
 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
 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
 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
 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
 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 }