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  * 3. 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  * @(#) Copyright (c) 1989, 1993, 1995 The Regents of the University of California.  All rights reserved.
  33  * @(#)showmount.c      8.3 (Berkeley) 3/29/95
  34  * $FreeBSD: src/usr.bin/showmount/showmount.c,v 1.16 2005/05/21 09:55:08 ru Exp $
  35  */
  36
  37 #include <sys/types.h>
  38 #include <sys/queue.h>
  39 #include <sys/file.h>
  40 #include <sys/socket.h>
  41 #include <sys/socketvar.h>
  42
  43 #include <err.h>
  44 #include <netdb.h>
  45 #include <rpc/rpc.h>
  46 #include <rpc/pmap_clnt.h>
  47 #include <rpc/pmap_prot.h>
  48 #include <vfs/nfs/rpcv2.h>
  49
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53 #include <unistd.h>
  54 #include <vis.h>
  55
  56 /* Constant defs */
  57 #define ALL     1
  58 #define DIRS    2
  59
  60 #define DODUMP          0x1
  61 #define DOEXPORTS       0x2
  62 #define DOPARSABLEEXPORTS       0x4
  63
  64 struct mountlist {
  65         struct mountlist *ml_left;
  66         struct mountlist *ml_right;
  67         char    ml_host[RPCMNT_NAMELEN+1];
  68         char    ml_dirp[RPCMNT_PATHLEN+1];
  69 };
  70
  71 struct grouplist {
  72         struct grouplist *gr_next;
  73         char    gr_name[RPCMNT_NAMELEN+1];
  74 };
  75
  76 struct exportslist {
  77         struct exportslist *ex_next;
  78         struct grouplist *ex_groups;
  79         char    ex_dirp[RPCMNT_PATHLEN+1];
  80 };
  81
  82 static struct mountlist *mntdump;
  83 static struct exportslist *exports;
  84 static int type = 0;
  85
  86 static void print_dump(struct mountlist *);
  87 static void usage(void);
  88 static int xdr_mntdump(XDR *, struct mountlist **);
  89 static int xdr_exports(XDR *, struct exportslist **);
  90 static enum clnt_stat tcp_callrpc(const char *, int, int, int, xdrproc_t,
  91                           char *, xdrproc_t, char *);
  92
  93 /*
  94  * This command queries the NFS mount daemon for it's mount list and/or
  95  * it's exports list and prints them out.
  96  * See "NFS: Network File System Protocol Specification, RFC1094, Appendix A"
  97  * and the "Network File System Protocol XXX.."
  98  * for detailed information on the protocol.
  99  */
 100 int
 101 main(int argc, char **argv)
 102 {
 103         struct exportslist *exp;
 104         struct grouplist *grp;
 105         int rpcs = 0, mntvers = 1;
 106         const char *host;
 107         int ch, nbytes;
 108         enum clnt_stat estat;
 109         char strvised[1024 * 4 + 1];
 110
 111         while ((ch = getopt(argc, argv, "adEe3")) != -1)
 112                 switch (ch) {
 113                 case 'a':
 114                         if (type == 0) {
 115                                 type = ALL;
 116                                 rpcs |= DODUMP;
 117                         } else
 118                                 usage();
 119                         break;
 120                 case 'd':
 121                         if (type == 0) {
 122                                 type = DIRS;
 123                                 rpcs |= DODUMP;
 124                         } else
 125                                 usage();
 126                         break;
 127                 case 'E':
 128                         rpcs |= DOPARSABLEEXPORTS;
 129                         break;
 130                 case 'e':
 131                         rpcs |= DOEXPORTS;
 132                         break;
 133                 case '3':
 134                         mntvers = 3;
 135                         break;
 136                 case '?':
 137                 default:
 138                         usage();
 139                 }
 140         argc -= optind;
 141         argv += optind;
 142
 143         if ((rpcs & DOPARSABLEEXPORTS) != 0) {
 144                 if ((rpcs & DOEXPORTS) != 0)
 145                         errx(1, "-E cannot be used with -e");
 146                 if ((rpcs & DODUMP) != 0)
 147                         errx(1, "-E cannot be used with -a or -d");
 148         }
 149
 150         if (argc > 0)
 151                 host = *argv;
 152         else
 153                 host = "localhost";
 154
 155         if (rpcs == 0)
 156                 rpcs = DODUMP;
 157
 158         if (rpcs & DODUMP)
 159                 if ((estat = tcp_callrpc(host, RPCPROG_MNT, mntvers,
 160                         RPCMNT_DUMP, (xdrproc_t)xdr_void, NULL,
 161                         (xdrproc_t)xdr_mntdump, (char *)&mntdump)) != 0) {
 162                         clnt_perrno(estat);
 163                         errx(1, "can't do mountdump rpc");
 164                 }
 165         if (rpcs & (DOEXPORTS | DOPARSABLEEXPORTS))
 166                 if ((estat = tcp_callrpc(host, RPCPROG_MNT, mntvers,
 167                         RPCMNT_EXPORT, (xdrproc_t)xdr_void, NULL,
 168                         (xdrproc_t)xdr_exports, (char *)&exports)) != 0) {
 169                         clnt_perrno(estat);
 170                         errx(1, "can't do exports rpc");
 171                 }
 172
 173         /* Now just print out the results */
 174         if (rpcs & DODUMP) {
 175                 switch (type) {
 176                 case ALL:
 177                         printf("All mount points on %s:\n", host);
 178                         break;
 179                 case DIRS:
 180                         printf("Directories on %s:\n", host);
 181                         break;
 182                 default:
 183                         printf("Hosts on %s:\n", host);
 184                         break;
 185                 }
 186                 print_dump(mntdump);
 187         }
 188         if (rpcs & DOEXPORTS) {
 189                 printf("Exports list on %s:\n", host);
 190                 exp = exports;
 191                 while (exp) {
 192                         printf("%-35s", exp->ex_dirp);
 193                         grp = exp->ex_groups;
 194                         if (grp == NULL) {
 195                                 printf("Everyone\n");
 196                         } else {
 197                                 while (grp) {
 198                                         printf("%s ", grp->gr_name);
 199                                         grp = grp->gr_next;
 200                                 }
 201                                 printf("\n");
 202                         }
 203                         exp = exp->ex_next;
 204                 }
 205         }
 206         if (rpcs & DOPARSABLEEXPORTS) {
 207                 exp = exports;
 208                 while (exp) {
 209                         nbytes = strsnvis(strvised, sizeof(strvised),
 210                             exp->ex_dirp, VIS_GLOB | VIS_NL, "\"'$");
 211                         if (nbytes == -1)
 212                                 err(1, "strsnvis");
 213                         printf("%s\n", strvised);
 214                         exp = exp->ex_next;
 215                 }
 216         }
 217         exit(0);
 218 }
 219
 220 /*
 221  * tcp_callrpc has the same interface as callrpc, but tries to
 222  * use tcp as transport method in order to handle large replies.
 223  */
 224 static enum clnt_stat
 225 tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
 226             xdrproc_t inproc, char *in, xdrproc_t outproc, char *out)
 227 {
 228         CLIENT *client;
 229         struct timeval timeout;
 230         enum clnt_stat rval;
 231
 232         if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL &&
 233             (client = clnt_create(host, prognum, versnum, "udp")) == NULL)
 234                 return ((int) rpc_createerr.cf_stat);
 235
 236         timeout.tv_sec = 25;
 237         timeout.tv_usec = 0;
 238         rval = clnt_call(client, procnum, inproc, in, outproc, out, timeout);
 239         clnt_destroy(client);
 240         return rval;
 241 }
 242
 243 /*
 244  * Xdr routine for retrieving the mount dump list
 245  */
 246 static int
 247 xdr_mntdump(XDR *xdrsp, struct mountlist **mlp)
 248 {
 249         struct mountlist *mp;
 250         struct mountlist *tp;
 251         struct mountlist **otp = NULL;
 252         int val, val2;
 253         int bool;
 254         char *strp;
 255
 256         *mlp = NULL;
 257         if (!xdr_bool(xdrsp, &bool))
 258                 return (0);
 259         while (bool) {
 260                 mp = (struct mountlist *)malloc(sizeof(struct mountlist));
 261                 if (mp == NULL)
 262                         return (0);
 263                 mp->ml_left = mp->ml_right = NULL;
 264                 strp = mp->ml_host;
 265                 if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
 266                         return (0);
 267                 strp = mp->ml_dirp;
 268                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 269                         return (0);
 270
 271                 /*
 272                  * Build a binary tree on sorted order of either host or dirp.
 273                  * Drop any duplications.
 274                  */
 275                 if (*mlp == NULL) {
 276                         *mlp = mp;
 277                 } else {
 278                         tp = *mlp;
 279                         while (tp) {
 280                                 val = strcmp(mp->ml_host, tp->ml_host);
 281                                 val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
 282                                 switch (type) {
 283                                 case ALL:
 284                                         if (val == 0) {
 285                                                 if (val2 == 0) {
 286                                                         free(mp);
 287                                                         goto next;
 288                                                 }
 289                                                 val = val2;
 290                                         }
 291                                         break;
 292                                 case DIRS:
 293                                         if (val2 == 0) {
 294                                                 free(mp);
 295                                                 goto next;
 296                                         }
 297                                         val = val2;
 298                                         break;
 299                                 default:
 300                                         if (val == 0) {
 301                                                 free(mp);
 302                                                 goto next;
 303                                         }
 304                                         break;
 305                                 }
 306                                 if (val < 0) {
 307                                         otp = &tp->ml_left;
 308                                         tp = tp->ml_left;
 309                                 } else {
 310                                         otp = &tp->ml_right;
 311                                         tp = tp->ml_right;
 312                                 }
 313                         }
 314                         *otp = mp;
 315                 }
 316 next:
 317                 if (!xdr_bool(xdrsp, &bool))
 318                         return (0);
 319         }
 320         return (1);
 321 }
 322
 323 /*
 324  * Xdr routine to retrieve exports list
 325  */
 326 static int
 327 xdr_exports(XDR *xdrsp, struct exportslist **exp)
 328 {
 329         struct exportslist *ep;
 330         struct grouplist *gp;
 331         int bool, grpbool;
 332         char *strp;
 333
 334         *exp = NULL;
 335         if (!xdr_bool(xdrsp, &bool))
 336                 return (0);
 337         while (bool) {
 338                 ep = (struct exportslist *)malloc(sizeof(struct exportslist));
 339                 if (ep == NULL)
 340                         return (0);
 341                 ep->ex_groups = NULL;
 342                 strp = ep->ex_dirp;
 343                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 344                         return (0);
 345                 if (!xdr_bool(xdrsp, &grpbool))
 346                         return (0);
 347                 while (grpbool) {
 348                         gp = (struct grouplist *)malloc(sizeof(struct grouplist));
 349                         if (gp == NULL)
 350                                 return (0);
 351                         strp = gp->gr_name;
 352                         if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
 353                                 return (0);
 354                         gp->gr_next = ep->ex_groups;
 355                         ep->ex_groups = gp;
 356                         if (!xdr_bool(xdrsp, &grpbool))
 357                                 return (0);
 358                 }
 359                 ep->ex_next = *exp;
 360                 *exp = ep;
 361                 if (!xdr_bool(xdrsp, &bool))
 362                         return (0);
 363         }
 364         return (1);
 365 }
 366
 367 static void
 368 usage(void)
 369 {
 370         fprintf(stderr, "usage: showmount [-a | -d] [-e3] [host]\n");
 371         exit(1);
 372 }
 373
 374 /*
 375  * Print the binary tree in inorder so that output is sorted.
 376  */
 377 static void
 378 print_dump(struct mountlist *mp)
 379 {
 380
 381         if (mp == NULL)
 382                 return;
 383         if (mp->ml_left)
 384                 print_dump(mp->ml_left);
 385         switch (type) {
 386         case ALL:
 387                 printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
 388                 break;
 389         case DIRS:
 390                 printf("%s\n", mp->ml_dirp);
 391                 break;
 392         default:
 393                 printf("%s\n", mp->ml_host);
 394                 break;
 395         }
 396         if (mp->ml_right)
 397                 print_dump(mp->ml_right);
 398 }