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