usr.bin/showmount/showmount.c

   1 /*      $NetBSD: showmount.c,v 1.16 2008/07/21 14:19:26 lukem Exp $     */
   2
   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 #include <sys/cdefs.h>
  36 #ifndef lint
  37 __COPYRIGHT("@(#) Copyright (c) 1989, 1993, 1995\
  38  The Regents of the University of California.  All rights reserved.");
  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 __RCSID("$NetBSD: showmount.c,v 1.16 2008/07/21 14:19:26 lukem Exp $");
  46 #endif /* not lint */
  47
  48 #include <sys/types.h>
  49 #include <sys/file.h>
  50 #include <sys/socket.h>
  51
  52 #include <netdb.h>
  53 #include <rpc/rpc.h>
  54 #include <rpc/pmap_clnt.h>
  55 #include <rpc/pmap_prot.h>
  56 #include <nfs/rpcv2.h>
  57
  58 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <string.h>
  61 #include <unistd.h>
  62
  63 /* Constant defs */
  64 #define ALL     1
  65 #define DIRS    2
  66
  67 #define DODUMP          0x1
  68 #define DOEXPORTS       0x2
  69
  70 struct mountlist {
  71         struct mountlist *ml_left;
  72         struct mountlist *ml_right;
  73         char    ml_host[RPCMNT_NAMELEN+1];
  74         char    ml_dirp[RPCMNT_PATHLEN+1];
  75 };
  76
  77 struct grouplist {
  78         struct grouplist *gr_next;
  79         char    gr_name[RPCMNT_NAMELEN+1];
  80 };
  81
  82 struct exportslist {
  83         struct exportslist *ex_next;
  84         struct grouplist *ex_groups;
  85         char    ex_dirp[RPCMNT_PATHLEN+1];
  86 };
  87
  88 static struct mountlist *mntdump;
  89 static struct exportslist *exports;
  90 static int type = 0;
  91
  92 int     main(int, char **);
  93 void    print_dump(struct mountlist *);
  94 void    usage(void);
  95 int     xdr_mntdump(XDR *, struct mountlist **);
  96 int     xdr_exports(XDR *, struct exportslist **);
  97 int     tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
  98     xdrproc_t inproc, char *in, xdrproc_t outproc, char *out);
  99
 100 /*
 101  * This command queries the NFS mount daemon for it's mount list and/or
 102  * it's exports list and prints them out.
 103  * See "NFS: Network File System Protocol Specification, RFC1094, Appendix A"
 104  * and the "Network File System Protocol XXX.."
 105  * for detailed information on the protocol.
 106  */
 107 int
 108 main(int argc, char **argv)
 109 {
 110         struct exportslist *exp;
 111         struct grouplist *grp;
 112         int estat, rpcs = 0, mntvers = 1;
 113         const char *host;
 114         int ch;
 115         int len;
 116
 117         while ((ch = getopt(argc, argv, "ade3")) != -1)
 118                 switch((char)ch) {
 119                 case 'a':
 120                         if (type == 0) {
 121                                 type = ALL;
 122                                 rpcs |= DODUMP;
 123                         } else
 124                                 usage();
 125                         break;
 126                 case 'd':
 127                         if (type == 0) {
 128                                 type = DIRS;
 129                                 rpcs |= DODUMP;
 130                         } else
 131                                 usage();
 132                         break;
 133                 case 'e':
 134                         rpcs |= DOEXPORTS;
 135                         break;
 136                 case '3':
 137                         mntvers = 3;
 138                         break;
 139                 case '?':
 140                 default:
 141                         usage();
 142                 }
 143         argc -= optind;
 144         argv += optind;
 145
 146         if (argc > 0)
 147                 host = *argv;
 148         else
 149                 host = "localhost";
 150
 151         if (rpcs == 0)
 152                 rpcs = DODUMP;
 153
 154         if (rpcs & DODUMP)
 155                 if ((estat = tcp_callrpc(host, RPCPROG_MNT, mntvers,
 156                          RPCMNT_DUMP, xdr_void, (char *)0,
 157                          xdr_mntdump, (char *)&mntdump)) != 0) {
 158                         fprintf(stderr, "showmount: Can't do Mountdump rpc: ");
 159                         clnt_perrno(estat);
 160                         exit(1);
 161                 }
 162         if (rpcs & DOEXPORTS)
 163                 if ((estat = tcp_callrpc(host, RPCPROG_MNT, mntvers,
 164                          RPCMNT_EXPORT, xdr_void, (char *)0,
 165                          xdr_exports, (char *)&exports)) != 0) {
 166                         fprintf(stderr, "showmount: Can't do Exports rpc: ");
 167                         clnt_perrno(estat);
 168                         exit(1);
 169                 }
 170
 171         /* Now just print out the results */
 172         if (rpcs & DODUMP) {
 173                 switch (type) {
 174                 case ALL:
 175                         printf("All mount points on %s:\n", host);
 176                         break;
 177                 case DIRS:
 178                         printf("Directories on %s:\n", host);
 179                         break;
 180                 default:
 181                         printf("Hosts on %s:\n", host);
 182                         break;
 183                 };
 184                 print_dump(mntdump);
 185         }
 186         if (rpcs & DOEXPORTS) {
 187                 printf("Exports list on %s:\n", host);
 188                 exp = exports;
 189                 while (exp) {
 190                         len = printf("%-35s", exp->ex_dirp);
 191                         if (len > 35)
 192                                 printf("\t");
 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
 207         exit(0);
 208 }
 209
 210 /*
 211  * tcp_callrpc has the same interface as callrpc, but tries to
 212  * use tcp as transport method in order to handle large replies.
 213  */
 214
 215 int
 216 tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
 217     xdrproc_t inproc, char *in, xdrproc_t outproc, char *out)
 218 {
 219         CLIENT *client;
 220         struct timeval timeout;
 221         int rval;
 222
 223         if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL &&
 224             (client = clnt_create(host, prognum, versnum, "udp")) == NULL)
 225                 return ((int) rpc_createerr.cf_stat);
 226
 227         timeout.tv_sec = 25;
 228         timeout.tv_usec = 0;
 229         rval = (int) clnt_call(client, procnum,
 230                                inproc, in,
 231                                outproc, out,
 232                                timeout);
 233         clnt_destroy(client);
 234         return rval;
 235 }
 236
 237 /*
 238  * Xdr routine for retrieving the mount dump list
 239  */
 240 int
 241 xdr_mntdump(XDR *xdrsp, struct mountlist **mlp)
 242 {
 243         struct mountlist *mp, **otp, *tp;
 244         int bool, val, val2;
 245         char *strp;
 246
 247         otp = NULL;
 248         *mlp = (struct mountlist *)0;
 249         if (!xdr_bool(xdrsp, &bool))
 250                 return (0);
 251         while (bool) {
 252                 mp = (struct mountlist *)malloc(sizeof(struct mountlist));
 253                 if (mp == NULL)
 254                         return (0);
 255                 mp->ml_left = mp->ml_right = (struct mountlist *)0;
 256                 strp = mp->ml_host;
 257                 if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
 258                         return (0);
 259                 strp = mp->ml_dirp;
 260                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 261                         return (0);
 262
 263                 /*
 264                  * Build a binary tree on sorted order of either host or dirp.
 265                  * Drop any duplications.
 266                  */
 267                 if (*mlp == NULL) {
 268                         *mlp = mp;
 269                 } else {
 270                         tp = *mlp;
 271                         while (tp) {
 272                                 val = strcmp(mp->ml_host, tp->ml_host);
 273                                 val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
 274                                 switch (type) {
 275                                 case ALL:
 276                                         if (val == 0) {
 277                                                 if (val2 == 0) {
 278                                                         free((caddr_t)mp);
 279                                                         goto next;
 280                                                 }
 281                                                 val = val2;
 282                                         }
 283                                         break;
 284                                 case DIRS:
 285                                         if (val2 == 0) {
 286                                                 free((caddr_t)mp);
 287                                                 goto next;
 288                                         }
 289                                         val = val2;
 290                                         break;
 291                                 default:
 292                                         if (val == 0) {
 293                                                 free((caddr_t)mp);
 294                                                 goto next;
 295                                         }
 296                                         break;
 297                                 };
 298                                 if (val < 0) {
 299                                         otp = &tp->ml_left;
 300                                         tp = tp->ml_left;
 301                                 } else {
 302                                         otp = &tp->ml_right;
 303                                         tp = tp->ml_right;
 304                                 }
 305                         }
 306                         *otp = mp;
 307                 }
 308 next:
 309                 if (!xdr_bool(xdrsp, &bool))
 310                         return (0);
 311         }
 312         return (1);
 313 }
 314
 315 /*
 316  * Xdr routine to retrieve exports list
 317  */
 318 int
 319 xdr_exports(XDR *xdrsp, struct exportslist **exp)
 320 {
 321         struct exportslist *ep;
 322         struct grouplist *gp;
 323         int bool, grpbool;
 324         char *strp;
 325
 326         *exp = (struct exportslist *)0;
 327         if (!xdr_bool(xdrsp, &bool))
 328                 return (0);
 329         while (bool) {
 330                 ep = (struct exportslist *)malloc(sizeof(struct exportslist));
 331                 if (ep == NULL)
 332                         return (0);
 333                 ep->ex_groups = (struct grouplist *)0;
 334                 strp = ep->ex_dirp;
 335                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 336                         return (0);
 337                 if (!xdr_bool(xdrsp, &grpbool))
 338                         return (0);
 339                 while (grpbool) {
 340                         gp = (struct grouplist *)malloc(sizeof(struct grouplist));
 341                         if (gp == NULL)
 342                                 return (0);
 343                         strp = gp->gr_name;
 344                         if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
 345                                 return (0);
 346                         gp->gr_next = ep->ex_groups;
 347                         ep->ex_groups = gp;
 348                         if (!xdr_bool(xdrsp, &grpbool))
 349                                 return (0);
 350                 }
 351                 ep->ex_next = *exp;
 352                 *exp = ep;
 353                 if (!xdr_bool(xdrsp, &bool))
 354                         return (0);
 355         }
 356         return (1);
 357 }
 358
 359 void
 360 usage()
 361 {
 362
 363         fprintf(stderr, "usage: showmount [-ade3] host\n");
 364         exit(1);
 365 }
 366
 367 /*
 368  * Print the binary tree in inorder so that output is sorted.
 369  */
 370 void
 371 print_dump(struct mountlist *mp)
 372 {
 373
 374         if (mp == NULL)
 375                 return;
 376         if (mp->ml_left)
 377                 print_dump(mp->ml_left);
 378         switch (type) {
 379         case ALL:
 380                 printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
 381                 break;
 382         case DIRS:
 383                 printf("%s\n", mp->ml_dirp);
 384                 break;
 385         default:
 386                 printf("%s\n", mp->ml_host);
 387                 break;
 388         };
 389         if (mp->ml_right)
 390                 print_dump(mp->ml_right);
 391 }