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 static const char rcsid[] =
  46   "$FreeBSD$";
  47 #endif /* not lint */
  48
  49 #include <sys/types.h>
  50 #include <sys/queue.h>
  51 #include <sys/file.h>
  52 #include <sys/socket.h>
  53 #include <sys/socketvar.h>
  54
  55 #include <err.h>
  56 #include <netdb.h>
  57 #include <rpc/rpc.h>
  58 #include <rpc/pmap_clnt.h>
  59 #include <rpc/pmap_prot.h>
  60 #include <rpcsvc/mount.h>
  61
  62 #include <stdio.h>
  63 #include <stdlib.h>
  64 #include <string.h>
  65 #include <unistd.h>
  66 #include <vis.h>
  67
  68 /* Constant defs */
  69 #define ALL     1
  70 #define DIRS    2
  71
  72 #define DODUMP                  0x1
  73 #define DOEXPORTS               0x2
  74 #define DOPARSABLEEXPORTS       0x4
  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         char strvised[MNTPATHLEN * 4 + 1];
 116         register struct exportslist *exp;
 117         register struct grouplist *grp;
 118         register int rpcs = 0, mntvers = 3;
 119         const char *host;
 120         int ch, estat, nbytes;
 121
 122         while ((ch = getopt(argc, argv, "adEe13")) != -1)
 123                 switch (ch) {
 124                 case 'a':
 125                         if (type == 0) {
 126                                 type = ALL;
 127                                 rpcs |= DODUMP;
 128                         } else
 129                                 usage();
 130                         break;
 131                 case 'd':
 132                         if (type == 0) {
 133                                 type = DIRS;
 134                                 rpcs |= DODUMP;
 135                         } else
 136                                 usage();
 137                         break;
 138                 case 'E':
 139                         rpcs |= DOPARSABLEEXPORTS;
 140                         break;
 141                 case 'e':
 142                         rpcs |= DOEXPORTS;
 143                         break;
 144                 case '1':
 145                         mntvers = 1;
 146                         break;
 147                 case '3':
 148                         mntvers = 3;
 149                         break;
 150                 case '?':
 151                 default:
 152                         usage();
 153                 }
 154         argc -= optind;
 155         argv += optind;
 156
 157         if ((rpcs & DOPARSABLEEXPORTS) != 0) {
 158                 if ((rpcs & DOEXPORTS) != 0)
 159                         errx(1, "-E cannot be used with -e");
 160                 if ((rpcs & DODUMP) != 0)
 161                         errx(1, "-E cannot be used with -a or -d");
 162         }
 163
 164         if (argc > 0)
 165                 host = *argv;
 166         else
 167                 host = "localhost";
 168
 169         if (rpcs == 0)
 170                 rpcs = DODUMP;
 171
 172         if (rpcs & DODUMP)
 173                 if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
 174                         MOUNTPROC_DUMP, (xdrproc_t)xdr_void, (char *)0,
 175                         (xdrproc_t)xdr_mntdump, (char *)&mntdump)) != 0) {
 176                         clnt_perrno(estat);
 177                         errx(1, "can't do mountdump rpc");
 178                 }
 179         if (rpcs & (DOEXPORTS | DOPARSABLEEXPORTS))
 180                 if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
 181                         MOUNTPROC_EXPORT, (xdrproc_t)xdr_void, (char *)0,
 182                         (xdrproc_t)xdr_exportslist, (char *)&exportslist)) != 0) {
 183                         clnt_perrno(estat);
 184                         errx(1, "can't do exports rpc");
 185                 }
 186
 187         /* Now just print out the results */
 188         if (rpcs & DODUMP) {
 189                 switch (type) {
 190                 case ALL:
 191                         printf("All mount points on %s:\n", host);
 192                         break;
 193                 case DIRS:
 194                         printf("Directories on %s:\n", host);
 195                         break;
 196                 default:
 197                         printf("Hosts on %s:\n", host);
 198                         break;
 199                 }
 200                 print_dump(mntdump);
 201         }
 202         if (rpcs & DOEXPORTS) {
 203                 printf("Exports list on %s:\n", host);
 204                 exp = exportslist;
 205                 while (exp) {
 206                         printf("%-34s ", exp->ex_dirp);
 207                         grp = exp->ex_groups;
 208                         if (grp == NULL) {
 209                                 printf("Everyone\n");
 210                         } else {
 211                                 while (grp) {
 212                                         printf("%s ", grp->gr_name);
 213                                         grp = grp->gr_next;
 214                                 }
 215                                 printf("\n");
 216                         }
 217                         exp = exp->ex_next;
 218                 }
 219         }
 220         if (rpcs & DOPARSABLEEXPORTS) {
 221                 exp = exportslist;
 222                 while (exp) {
 223                         nbytes = strsnvis(strvised, sizeof(strvised),
 224                             exp->ex_dirp, VIS_GLOB | VIS_NL, "\"'$");
 225                         if (nbytes == -1)
 226                                 err(1, "strsnvis");
 227                         printf("%s\n", strvised);
 228                         exp = exp->ex_next;
 229                 }
 230         }
 231         exit(0);
 232 }
 233
 234 /*
 235  * tcp_callrpc has the same interface as callrpc, but tries to
 236  * use tcp as transport method in order to handle large replies.
 237  */
 238 int
 239 tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
 240     xdrproc_t inproc, char *in, xdrproc_t outproc, char *out)
 241 {
 242         CLIENT *client;
 243         struct timeval timeout;
 244         int rval;
 245
 246         if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL &&
 247             (client = clnt_create(host, prognum, versnum, "udp")) == NULL)
 248                 return ((int) rpc_createerr.cf_stat);
 249
 250         timeout.tv_sec = 25;
 251         timeout.tv_usec = 0;
 252         rval = (int) clnt_call(client, procnum,
 253                                inproc, in,
 254                                outproc, out,
 255                                timeout);
 256         clnt_destroy(client);
 257         return rval;
 258 }
 259
 260 /*
 261  * Xdr routine for retrieving the mount dump list
 262  */
 263 int
 264 xdr_mntdump(XDR *xdrsp, struct mountlist **mlp)
 265 {
 266         register struct mountlist *mp;
 267         register struct mountlist *tp;
 268         register struct mountlist **otp;
 269         int val, val2;
 270         int bool;
 271         char *strp;
 272
 273         *mlp = (struct mountlist *)0;
 274         if (!xdr_bool(xdrsp, &bool))
 275                 return (0);
 276         while (bool) {
 277                 mp = (struct mountlist *)malloc(sizeof(struct mountlist));
 278                 if (mp == NULL)
 279                         return (0);
 280                 mp->ml_left = mp->ml_right = (struct mountlist *)0;
 281                 strp = mp->ml_host;
 282                 if (!xdr_string(xdrsp, &strp, MNTNAMLEN)) {
 283                         free(mp);
 284                         return (0);
 285                 }
 286                 strp = mp->ml_dirp;
 287                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN)) {
 288                         free(mp);
 289                         return (0);
 290                 }
 291
 292                 /*
 293                  * Build a binary tree on sorted order of either host or dirp.
 294                  * Drop any duplications.
 295                  */
 296                 if (*mlp == NULL) {
 297                         *mlp = mp;
 298                 } else {
 299                         tp = *mlp;
 300                         while (tp) {
 301                                 val = strcmp(mp->ml_host, tp->ml_host);
 302                                 val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
 303                                 switch (type) {
 304                                 case ALL:
 305                                         if (val == 0) {
 306                                                 if (val2 == 0) {
 307                                                         free((caddr_t)mp);
 308                                                         goto next;
 309                                                 }
 310                                                 val = val2;
 311                                         }
 312                                         break;
 313                                 case DIRS:
 314                                         if (val2 == 0) {
 315                                                 free((caddr_t)mp);
 316                                                 goto next;
 317                                         }
 318                                         val = val2;
 319                                         break;
 320                                 default:
 321                                         if (val == 0) {
 322                                                 free((caddr_t)mp);
 323                                                 goto next;
 324                                         }
 325                                         break;
 326                                 }
 327                                 if (val < 0) {
 328                                         otp = &tp->ml_left;
 329                                         tp = tp->ml_left;
 330                                 } else {
 331                                         otp = &tp->ml_right;
 332                                         tp = tp->ml_right;
 333                                 }
 334                         }
 335                         *otp = mp;
 336                 }
 337 next:
 338                 if (!xdr_bool(xdrsp, &bool))
 339                         return (0);
 340         }
 341         return (1);
 342 }
 343
 344 /*
 345  * Xdr routine to retrieve exports list
 346  */
 347 int
 348 xdr_exportslist(XDR *xdrsp, struct exportslist **exp)
 349 {
 350         register struct exportslist *ep;
 351         register struct grouplist *gp;
 352         int bool, grpbool;
 353         char *strp;
 354
 355         *exp = (struct exportslist *)0;
 356         if (!xdr_bool(xdrsp, &bool))
 357                 return (0);
 358         while (bool) {
 359                 ep = (struct exportslist *)malloc(sizeof(struct exportslist));
 360                 if (ep == NULL)
 361                         return (0);
 362                 ep->ex_groups = (struct grouplist *)0;
 363                 strp = ep->ex_dirp;
 364                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
 365                         return (0);
 366                 if (!xdr_bool(xdrsp, &grpbool))
 367                         return (0);
 368                 while (grpbool) {
 369                         gp = (struct grouplist *)malloc(sizeof(struct grouplist));
 370                         if (gp == NULL)
 371                                 return (0);
 372                         strp = gp->gr_name;
 373                         if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
 374                                 return (0);
 375                         gp->gr_next = ep->ex_groups;
 376                         ep->ex_groups = gp;
 377                         if (!xdr_bool(xdrsp, &grpbool))
 378                                 return (0);
 379                 }
 380                 ep->ex_next = *exp;
 381                 *exp = ep;
 382                 if (!xdr_bool(xdrsp, &bool))
 383                         return (0);
 384         }
 385         return (1);
 386 }
 387
 388 static void
 389 usage(void)
 390 {
 391         fprintf(stderr, "usage: showmount [-a | -d] [-e3] [host]\n");
 392         exit(1);
 393 }
 394
 395 /*
 396  * Print the binary tree in inorder so that output is sorted.
 397  */
 398 void
 399 print_dump(struct mountlist *mp)
 400 {
 401
 402         if (mp == NULL)
 403                 return;
 404         if (mp->ml_left)
 405                 print_dump(mp->ml_left);
 406         switch (type) {
 407         case ALL:
 408                 printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
 409                 break;
 410         case DIRS:
 411                 printf("%s\n", mp->ml_dirp);
 412                 break;
 413         default:
 414                 printf("%s\n", mp->ml_host);
 415                 break;
 416         }
 417         if (mp->ml_right)
 418                 print_dump(mp->ml_right);
 419 }