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 <getopt.h>
  57 #include <netdb.h>
  58 #include <rpc/rpc.h>
  59 #include <rpc/pmap_clnt.h>
  60 #include <rpc/pmap_prot.h>
  61 #include <rpcsvc/mount.h>
  62
  63 #include <stdio.h>
  64 #include <stdlib.h>
  65 #include <string.h>
  66 #include <unistd.h>
  67 #include <vis.h>
  68
  69 /* Constant defs */
  70 #define ALL     1
  71 #define DIRS    2
  72
  73 #define DODUMP                  0x1
  74 #define DOEXPORTS               0x2
  75 #define DOPARSABLEEXPORTS       0x4
  76
  77 struct mountlist {
  78         struct mountlist *ml_left;
  79         struct mountlist *ml_right;
  80         char    ml_host[MNTNAMLEN+1];
  81         char    ml_dirp[MNTPATHLEN+1];
  82 };
  83
  84 struct grouplist {
  85         struct grouplist *gr_next;
  86         char    gr_name[MNTNAMLEN+1];
  87 };
  88
  89 struct exportslist {
  90         struct exportslist *ex_next;
  91         struct grouplist *ex_groups;
  92         char    ex_dirp[MNTPATHLEN+1];
  93 };
  94
  95 static struct mountlist *mntdump;
  96 static struct exportslist *exportslist;
  97 static int type = 0;
  98
  99 void print_dump(struct mountlist *);
 100 static void usage(void);
 101 int xdr_mntdump(XDR *, struct mountlist **);
 102 int xdr_exportslist(XDR *, struct exportslist **);
 103 int tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
 104                 xdrproc_t inproc, char *in, xdrproc_t outproc, char *out);
 105
 106 static const struct option long_opts[] = {
 107         { "all",                        no_argument,    NULL,   'a' },
 108         { "directories",        no_argument,    NULL,   'd' },
 109         { "exports-script",     no_argument,    NULL,   'E' },
 110         { "exports",            no_argument,    NULL,   'e' },
 111         { NULL,                         0,                              NULL,   0 },
 112 };
 113
 114 /*
 115  * This command queries the NFS mount daemon for it's mount list and/or
 116  * it's exports list and prints them out.
 117  * See "NFS: Network File System Protocol Specification, RFC1094, Appendix A"
 118  * and the "Network File System Protocol XXX.."
 119  * for detailed information on the protocol.
 120  */
 121 int
 122 main(int argc, char **argv)
 123 {
 124         char strvised[MNTPATHLEN * 4 + 1];
 125         register struct exportslist *exp;
 126         register struct grouplist *grp;
 127         register int rpcs = 0, mntvers = 3;
 128         const char *host;
 129         int ch, estat, nbytes;
 130
 131         while ((ch = getopt_long(argc, argv, "+adEe13", long_opts, NULL)) != -1)
 132                 switch (ch) {
 133                 case 'a':
 134                         if (type == 0) {
 135                                 type = ALL;
 136                                 rpcs |= DODUMP;
 137                         } else
 138                                 usage();
 139                         break;
 140                 case 'd':
 141                         if (type == 0) {
 142                                 type = DIRS;
 143                                 rpcs |= DODUMP;
 144                         } else
 145                                 usage();
 146                         break;
 147                 case 'E':
 148                         rpcs |= DOPARSABLEEXPORTS;
 149                         break;
 150                 case 'e':
 151                         rpcs |= DOEXPORTS;
 152                         break;
 153                 case '1':
 154                         mntvers = 1;
 155                         break;
 156                 case '3':
 157                         mntvers = 3;
 158                         break;
 159                 case '?':
 160                 default:
 161                         usage();
 162                 }
 163         argc -= optind;
 164         argv += optind;
 165
 166         if ((rpcs & DOPARSABLEEXPORTS) != 0) {
 167                 if ((rpcs & DOEXPORTS) != 0)
 168                         errx(1, "-E cannot be used with -e");
 169                 if ((rpcs & DODUMP) != 0)
 170                         errx(1, "-E cannot be used with -a or -d");
 171         }
 172
 173         if (argc > 0)
 174                 host = *argv;
 175         else
 176                 host = "localhost";
 177
 178         if (rpcs == 0)
 179                 rpcs = DODUMP;
 180
 181         if (rpcs & DODUMP)
 182                 if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
 183                         MOUNTPROC_DUMP, (xdrproc_t)xdr_void, (char *)0,
 184                         (xdrproc_t)xdr_mntdump, (char *)&mntdump)) != 0) {
 185                         clnt_perrno(estat);
 186                         errx(1, "can't do mountdump rpc");
 187                 }
 188         if (rpcs & (DOEXPORTS | DOPARSABLEEXPORTS))
 189                 if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers,
 190                         MOUNTPROC_EXPORT, (xdrproc_t)xdr_void, (char *)0,
 191                         (xdrproc_t)xdr_exportslist, (char *)&exportslist)) != 0) {
 192                         clnt_perrno(estat);
 193                         errx(1, "can't do exports rpc");
 194                 }
 195
 196         /* Now just print out the results */
 197         if (rpcs & DODUMP) {
 198                 switch (type) {
 199                 case ALL:
 200                         printf("All mount points on %s:\n", host);
 201                         break;
 202                 case DIRS:
 203                         printf("Directories on %s:\n", host);
 204                         break;
 205                 default:
 206                         printf("Hosts on %s:\n", host);
 207                         break;
 208                 }
 209                 print_dump(mntdump);
 210         }
 211         if (rpcs & DOEXPORTS) {
 212                 printf("Exports list on %s:\n", host);
 213                 exp = exportslist;
 214                 while (exp) {
 215                         printf("%-34s ", exp->ex_dirp);
 216                         grp = exp->ex_groups;
 217                         if (grp == NULL) {
 218                                 printf("Everyone\n");
 219                         } else {
 220                                 while (grp) {
 221                                         printf("%s ", grp->gr_name);
 222                                         grp = grp->gr_next;
 223                                 }
 224                                 printf("\n");
 225                         }
 226                         exp = exp->ex_next;
 227                 }
 228         }
 229         if (rpcs & DOPARSABLEEXPORTS) {
 230                 exp = exportslist;
 231                 while (exp) {
 232                         nbytes = strsnvis(strvised, sizeof(strvised),
 233                             exp->ex_dirp, VIS_GLOB | VIS_NL, "\"'$");
 234                         if (nbytes == -1)
 235                                 err(1, "strsnvis");
 236                         printf("%s\n", strvised);
 237                         exp = exp->ex_next;
 238                 }
 239         }
 240         exit(0);
 241 }
 242
 243 /*
 244  * tcp_callrpc has the same interface as callrpc, but tries to
 245  * use tcp as transport method in order to handle large replies.
 246  */
 247 int
 248 tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
 249     xdrproc_t inproc, char *in, xdrproc_t outproc, char *out)
 250 {
 251         CLIENT *client;
 252         struct timeval timeout;
 253         int rval;
 254
 255         if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL &&
 256             (client = clnt_create(host, prognum, versnum, "udp")) == NULL)
 257                 return ((int) rpc_createerr.cf_stat);
 258
 259         timeout.tv_sec = 25;
 260         timeout.tv_usec = 0;
 261         rval = (int) clnt_call(client, procnum,
 262                                inproc, in,
 263                                outproc, out,
 264                                timeout);
 265         clnt_destroy(client);
 266         return rval;
 267 }
 268
 269 /*
 270  * Xdr routine for retrieving the mount dump list
 271  */
 272 int
 273 xdr_mntdump(XDR *xdrsp, struct mountlist **mlp)
 274 {
 275         register struct mountlist *mp;
 276         register struct mountlist *tp;
 277         register struct mountlist **otp;
 278         int val, val2;
 279         int bool;
 280         char *strp;
 281
 282         *mlp = (struct mountlist *)0;
 283         if (!xdr_bool(xdrsp, &bool))
 284                 return (0);
 285         while (bool) {
 286                 mp = (struct mountlist *)malloc(sizeof(struct mountlist));
 287                 if (mp == NULL)
 288                         return (0);
 289                 mp->ml_left = mp->ml_right = (struct mountlist *)0;
 290                 strp = mp->ml_host;
 291                 if (!xdr_string(xdrsp, &strp, MNTNAMLEN)) {
 292                         free(mp);
 293                         return (0);
 294                 }
 295                 strp = mp->ml_dirp;
 296                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN)) {
 297                         free(mp);
 298                         return (0);
 299                 }
 300
 301                 /*
 302                  * Build a binary tree on sorted order of either host or dirp.
 303                  * Drop any duplications.
 304                  */
 305                 if (*mlp == NULL) {
 306                         *mlp = mp;
 307                 } else {
 308                         tp = *mlp;
 309                         while (tp) {
 310                                 val = strcmp(mp->ml_host, tp->ml_host);
 311                                 val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
 312                                 switch (type) {
 313                                 case ALL:
 314                                         if (val == 0) {
 315                                                 if (val2 == 0) {
 316                                                         free((caddr_t)mp);
 317                                                         goto next;
 318                                                 }
 319                                                 val = val2;
 320                                         }
 321                                         break;
 322                                 case DIRS:
 323                                         if (val2 == 0) {
 324                                                 free((caddr_t)mp);
 325                                                 goto next;
 326                                         }
 327                                         val = val2;
 328                                         break;
 329                                 default:
 330                                         if (val == 0) {
 331                                                 free((caddr_t)mp);
 332                                                 goto next;
 333                                         }
 334                                         break;
 335                                 }
 336                                 if (val < 0) {
 337                                         otp = &tp->ml_left;
 338                                         tp = tp->ml_left;
 339                                 } else {
 340                                         otp = &tp->ml_right;
 341                                         tp = tp->ml_right;
 342                                 }
 343                         }
 344                         *otp = mp;
 345                 }
 346 next:
 347                 if (!xdr_bool(xdrsp, &bool))
 348                         return (0);
 349         }
 350         return (1);
 351 }
 352
 353 /*
 354  * Xdr routine to retrieve exports list
 355  */
 356 int
 357 xdr_exportslist(XDR *xdrsp, struct exportslist **exp)
 358 {
 359         register struct exportslist *ep;
 360         register struct grouplist *gp;
 361         int bool, grpbool;
 362         char *strp;
 363
 364         *exp = (struct exportslist *)0;
 365         if (!xdr_bool(xdrsp, &bool))
 366                 return (0);
 367         while (bool) {
 368                 ep = (struct exportslist *)malloc(sizeof(struct exportslist));
 369                 if (ep == NULL)
 370                         return (0);
 371                 ep->ex_groups = (struct grouplist *)0;
 372                 strp = ep->ex_dirp;
 373                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
 374                         return (0);
 375                 if (!xdr_bool(xdrsp, &grpbool))
 376                         return (0);
 377                 while (grpbool) {
 378                         gp = (struct grouplist *)malloc(sizeof(struct grouplist));
 379                         if (gp == NULL)
 380                                 return (0);
 381                         strp = gp->gr_name;
 382                         if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
 383                                 return (0);
 384                         gp->gr_next = ep->ex_groups;
 385                         ep->ex_groups = gp;
 386                         if (!xdr_bool(xdrsp, &grpbool))
 387                                 return (0);
 388                 }
 389                 ep->ex_next = *exp;
 390                 *exp = ep;
 391                 if (!xdr_bool(xdrsp, &bool))
 392                         return (0);
 393         }
 394         return (1);
 395 }
 396
 397 static void
 398 usage(void)
 399 {
 400         fprintf(stderr, "usage: showmount [-a | -d] [-e3] [host]\n");
 401         exit(1);
 402 }
 403
 404 /*
 405  * Print the binary tree in inorder so that output is sorted.
 406  */
 407 void
 408 print_dump(struct mountlist *mp)
 409 {
 410
 411         if (mp == NULL)
 412                 return;
 413         if (mp->ml_left)
 414                 print_dump(mp->ml_left);
 415         switch (type) {
 416         case ALL:
 417                 printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
 418                 break;
 419         case DIRS:
 420                 printf("%s\n", mp->ml_dirp);
 421                 break;
 422         default:
 423                 printf("%s\n", mp->ml_host);
 424                 break;
 425         }
 426         if (mp->ml_right)
 427                 print_dump(mp->ml_right);
 428 }