usr.bin/showmount/showmount.c

   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 #ifndef lint
  36 static const char copyright[] =
  37 "@(#) Copyright (c) 1989, 1993, 1995\n\
  38         The Regents of the University of California.  All rights reserved.\n";
  39 #endif /* not lint */
  40
  41 #ifndef lint
  42 #if 0
  43 static char sccsid[] = "@(#)showmount.c 8.3 (Berkeley) 3/29/95";
  44 #endif
  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 <getopt.h>
  55 #include <netdb.h>
  56 #include <rpc/rpc.h>
  57 #include <rpc/pmap_clnt.h>
  58 #include <rpc/pmap_prot.h>
  59 #include <rpcsvc/mount.h>
  60
  61 #include <stdio.h>
  62 #include <stdlib.h>
  63 #include <string.h>
  64 #include <unistd.h>
  65 #include <vis.h>
  66
  67 /* Constant defs */
  68 #define ALL     1
  69 #define DIRS    2
  70
  71 #define DODUMP                  0x1
  72 #define DOEXPORTS               0x2
  73 #define DOPARSABLEEXPORTS       0x4
  74
  75 struct mountlist {
  76         struct mountlist *ml_left;
  77         struct mountlist *ml_right;
  78         char    ml_host[MNTNAMLEN+1];
  79         char    ml_dirp[MNTPATHLEN+1];
  80 };
  81
  82 struct grouplist {
  83         struct grouplist *gr_next;
  84         char    gr_name[MNTNAMLEN+1];
  85 };
  86
  87 struct exportslist {
  88         struct exportslist *ex_next;
  89         struct grouplist *ex_groups;
  90         char    ex_dirp[MNTPATHLEN+1];
  91 };
  92
  93 static struct mountlist *mntdump;
  94 static struct exportslist *exportslist;
  95 static int type = 0;
  96
  97 void print_dump(struct mountlist *);
  98 static void usage(void) __dead2;
  99 int xdr_mntdump(XDR *, struct mountlist **);
 100 int xdr_exportslist(XDR *, struct exportslist **);
 101 int tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
 102                 xdrproc_t inproc, char *in, xdrproc_t outproc, char *out);
 103
 104 static const struct option long_opts[] = {
 105         { "all",                        no_argument,    NULL,   'a' },
 106         { "directories",        no_argument,    NULL,   'd' },
 107         { "exports-script",     no_argument,    NULL,   'E' },
 108         { "exports",            no_argument,    NULL,   'e' },
 109         { NULL,                         0,                              NULL,   0 },
 110 };
 111
 112 /*
 113  * This command queries the NFS mount daemon for it's mount list and/or
 114  * it's exports list and prints them out.
 115  * See "NFS: Network File System Protocol Specification, RFC1094, Appendix A"
 116  * and the "Network File System Protocol XXX.."
 117  * for detailed information on the protocol.
 118  */
 119 int
 120 main(int argc, char **argv)
 121 {
 122         char strvised[MNTPATHLEN * 4 + 1];
 123         register struct exportslist *exp;
 124         register struct grouplist *grp;
 125         register int rpcs = 0, mntvers = 3;
 126         const char *host;
 127         int ch, estat, nbytes;
 128
 129         while ((ch = getopt_long(argc, argv, "+adEe13", long_opts, NULL)) != -1)
 130                 switch (ch) {
 131                 case 'a':
 132                         if (type == 0) {
 133                                 type = ALL;
 134                                 rpcs |= DODUMP;
 135                         } else
 136                                 usage();
 137                         break;
 138                 case 'd':
 139                         if (type == 0) {
 140                                 type = DIRS;
 141                                 rpcs |= DODUMP;
 142                         } else
 143                                 usage();
 144                         break;
 145                 case 'E':
 146                         rpcs |= DOPARSABLEEXPORTS;
 147                         break;
 148                 case 'e':
 149                         rpcs |= DOEXPORTS;
 150                         break;
 151                 case '1':
 152                         mntvers = 1;
 153                         break;
 154                 case '3':
 155                         mntvers = 3;
 156                         break;
 157                 case '?':
 158                 default:
 159                         usage();
 160                 }
 161         argc -= optind;
 162         argv += optind;
 163
 164         if ((rpcs & DOPARSABLEEXPORTS) != 0) {
 165                 if ((rpcs & DOEXPORTS) != 0)
 166                         errx(1, "-E cannot be used with -e");
 167                 if ((rpcs & DODUMP) != 0)
 168                         errx(1, "-E cannot be used with -a or -d");
 169         }
 170
 171         if (argc > 0)
 172                 host = *argv;
 173         else
 174                 host = "localhost";
 175
 176         if (rpcs == 0)
 177                 rpcs = DODUMP;
 178
 179         if (rpcs & DODUMP)
 180                 if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
 181                         MOUNTPROC_DUMP, (xdrproc_t)xdr_void, (char *)0,
 182                         (xdrproc_t)xdr_mntdump, (char *)&mntdump)) != 0) {
 183                         clnt_perrno(estat);
 184                         errx(1, "can't do mountdump rpc");
 185                 }
 186         if (rpcs & (DOEXPORTS | DOPARSABLEEXPORTS))
 187                 if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
 188                         MOUNTPROC_EXPORT, (xdrproc_t)xdr_void, (char *)0,
 189                         (xdrproc_t)xdr_exportslist, (char *)&exportslist)) != 0) {
 190                         clnt_perrno(estat);
 191                         errx(1, "can't do exports rpc");
 192                 }
 193
 194         /* Now just print out the results */
 195         if (rpcs & DODUMP) {
 196                 switch (type) {
 197                 case ALL:
 198                         printf("All mount points on %s:\n", host);
 199                         break;
 200                 case DIRS:
 201                         printf("Directories on %s:\n", host);
 202                         break;
 203                 default:
 204                         printf("Hosts on %s:\n", host);
 205                         break;
 206                 }
 207                 print_dump(mntdump);
 208         }
 209         if (rpcs & DOEXPORTS) {
 210                 printf("Exports list on %s:\n", host);
 211                 exp = exportslist;
 212                 while (exp) {
 213                         printf("%-34s ", exp->ex_dirp);
 214                         grp = exp->ex_groups;
 215                         if (grp == NULL) {
 216                                 printf("Everyone\n");
 217                         } else {
 218                                 while (grp) {
 219                                         printf("%s ", grp->gr_name);
 220                                         grp = grp->gr_next;
 221                                 }
 222                                 printf("\n");
 223                         }
 224                         exp = exp->ex_next;
 225                 }
 226         }
 227         if (rpcs & DOPARSABLEEXPORTS) {
 228                 exp = exportslist;
 229                 while (exp) {
 230                         nbytes = strsnvis(strvised, sizeof(strvised),
 231                             exp->ex_dirp, VIS_GLOB | VIS_NL, "\"'$");
 232                         if (nbytes == -1)
 233                                 err(1, "strsnvis");
 234                         printf("%s\n", strvised);
 235                         exp = exp->ex_next;
 236                 }
 237         }
 238         exit(0);
 239 }
 240
 241 /*
 242  * tcp_callrpc has the same interface as callrpc, but tries to
 243  * use tcp as transport method in order to handle large replies.
 244  */
 245 int
 246 tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
 247     xdrproc_t inproc, char *in, xdrproc_t outproc, char *out)
 248 {
 249         CLIENT *client;
 250         struct timeval timeout;
 251         int rval;
 252
 253         if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL &&
 254             (client = clnt_create(host, prognum, versnum, "udp")) == NULL)
 255                 return ((int) rpc_createerr.cf_stat);
 256
 257         timeout.tv_sec = 25;
 258         timeout.tv_usec = 0;
 259         rval = (int) clnt_call(client, procnum,
 260                                inproc, in,
 261                                outproc, out,
 262                                timeout);
 263         clnt_destroy(client);
 264         return rval;
 265 }
 266
 267 /*
 268  * Xdr routine for retrieving the mount dump list
 269  */
 270 int
 271 xdr_mntdump(XDR *xdrsp, struct mountlist **mlp)
 272 {
 273         register struct mountlist *mp;
 274         register struct mountlist *tp;
 275         register struct mountlist **otp;
 276         int val, val2;
 277         int bool;
 278         char *strp;
 279
 280         *mlp = (struct mountlist *)0;
 281         if (!xdr_bool(xdrsp, &bool))
 282                 return (0);
 283         while (bool) {
 284                 mp = (struct mountlist *)malloc(sizeof(struct mountlist));
 285                 if (mp == NULL)
 286                         return (0);
 287                 mp->ml_left = mp->ml_right = (struct mountlist *)0;
 288                 strp = mp->ml_host;
 289                 if (!xdr_string(xdrsp, &strp, MNTNAMLEN)) {
 290                         free(mp);
 291                         return (0);
 292                 }
 293                 strp = mp->ml_dirp;
 294                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN)) {
 295                         free(mp);
 296                         return (0);
 297                 }
 298
 299                 /*
 300                  * Build a binary tree on sorted order of either host or dirp.
 301                  * Drop any duplications.
 302                  */
 303                 if (*mlp == NULL) {
 304                         *mlp = mp;
 305                 } else {
 306                         tp = *mlp;
 307                         while (tp) {
 308                                 val = strcmp(mp->ml_host, tp->ml_host);
 309                                 val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
 310                                 switch (type) {
 311                                 case ALL:
 312                                         if (val == 0) {
 313                                                 if (val2 == 0) {
 314                                                         free((caddr_t)mp);
 315                                                         goto next;
 316                                                 }
 317                                                 val = val2;
 318                                         }
 319                                         break;
 320                                 case DIRS:
 321                                         if (val2 == 0) {
 322                                                 free((caddr_t)mp);
 323                                                 goto next;
 324                                         }
 325                                         val = val2;
 326                                         break;
 327                                 default:
 328                                         if (val == 0) {
 329                                                 free((caddr_t)mp);
 330                                                 goto next;
 331                                         }
 332                                         break;
 333                                 }
 334                                 if (val < 0) {
 335                                         otp = &tp->ml_left;
 336                                         tp = tp->ml_left;
 337                                 } else {
 338                                         otp = &tp->ml_right;
 339                                         tp = tp->ml_right;
 340                                 }
 341                         }
 342                         *otp = mp;
 343                 }
 344 next:
 345                 if (!xdr_bool(xdrsp, &bool))
 346                         return (0);
 347         }
 348         return (1);
 349 }
 350
 351 /*
 352  * Xdr routine to retrieve exports list
 353  */
 354 int
 355 xdr_exportslist(XDR *xdrsp, struct exportslist **exp)
 356 {
 357         register struct exportslist *ep;
 358         register struct grouplist *gp;
 359         int bool, grpbool;
 360         char *strp;
 361
 362         *exp = (struct exportslist *)0;
 363         if (!xdr_bool(xdrsp, &bool))
 364                 return (0);
 365         while (bool) {
 366                 ep = (struct exportslist *)malloc(sizeof(struct exportslist));
 367                 if (ep == NULL)
 368                         return (0);
 369                 ep->ex_groups = (struct grouplist *)0;
 370                 strp = ep->ex_dirp;
 371                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
 372                         return (0);
 373                 if (!xdr_bool(xdrsp, &grpbool))
 374                         return (0);
 375                 while (grpbool) {
 376                         gp = (struct grouplist *)malloc(sizeof(struct grouplist));
 377                         if (gp == NULL)
 378                                 return (0);
 379                         strp = gp->gr_name;
 380                         if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
 381                                 return (0);
 382                         gp->gr_next = ep->ex_groups;
 383                         ep->ex_groups = gp;
 384                         if (!xdr_bool(xdrsp, &grpbool))
 385                                 return (0);
 386                 }
 387                 ep->ex_next = *exp;
 388                 *exp = ep;
 389                 if (!xdr_bool(xdrsp, &bool))
 390                         return (0);
 391         }
 392         return (1);
 393 }
 394
 395 static void
 396 usage(void)
 397 {
 398         fprintf(stderr, "usage: showmount [-a | -d] [-e3] [host]\n");
 399         exit(1);
 400 }
 401
 402 /*
 403  * Print the binary tree in inorder so that output is sorted.
 404  */
 405 void
 406 print_dump(struct mountlist *mp)
 407 {
 408
 409         if (mp == NULL)
 410                 return;
 411         if (mp->ml_left)
 412                 print_dump(mp->ml_left);
 413         switch (type) {
 414         case ALL:
 415                 printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
 416                 break;
 417         case DIRS:
 418                 printf("%s\n", mp->ml_dirp);
 419                 break;
 420         default:
 421                 printf("%s\n", mp->ml_host);
 422                 break;
 423         }
 424         if (mp->ml_right)
 425                 print_dump(mp->ml_right);
 426 }