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 <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 void print_dump(struct mountlist *);
  87 static void usage(void);
  88 int xdr_mntdump(XDR *, struct mountlist **);
  89 int xdr_exports(XDR *, struct exportslist **);
  90 int tcp_callrpc(const char *, int, int, int, xdrproc_t, char *, xdrproc_t,
  91                 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, estat, nbytes;
 108         char strvised[1024 * 4 + 1];
 109
 110         while ((ch = getopt(argc, argv, "adEe3")) != -1)
 111                 switch (ch) {
 112                 case 'a':
 113                         if (type == 0) {
 114                                 type = ALL;
 115                                 rpcs |= DODUMP;
 116                         } else
 117                                 usage();
 118                         break;
 119                 case 'd':
 120                         if (type == 0) {
 121                                 type = DIRS;
 122                                 rpcs |= DODUMP;
 123                         } else
 124                                 usage();
 125                         break;
 126                 case 'E':
 127                         rpcs |= DOPARSABLEEXPORTS;
 128                         break;
 129                 case 'e':
 130                         rpcs |= DOEXPORTS;
 131                         break;
 132                 case '3':
 133                         mntvers = 3;
 134                         break;
 135                 case '?':
 136                 default:
 137                         usage();
 138                 }
 139         argc -= optind;
 140         argv += optind;
 141
 142         if ((rpcs & DOPARSABLEEXPORTS) != 0) {
 143                 if ((rpcs & DOEXPORTS) != 0)
 144                         errx(1, "-E cannot be used with -e");
 145                 if ((rpcs & DODUMP) != 0)
 146                         errx(1, "-E cannot be used with -a or -d");
 147         }
 148
 149         if (argc > 0)
 150                 host = *argv;
 151         else
 152                 host = "localhost";
 153
 154         if (rpcs == 0)
 155                 rpcs = DODUMP;
 156
 157         if (rpcs & DODUMP)
 158                 if ((estat = tcp_callrpc(host, RPCPROG_MNT, mntvers,
 159                         RPCMNT_DUMP, (xdrproc_t)xdr_void, NULL,
 160                         (xdrproc_t)xdr_mntdump, (char *)&mntdump)) != 0) {
 161                         clnt_perrno(estat);
 162                         errx(1, "can't do mountdump rpc");
 163                 }
 164         if (rpcs & (DOEXPORTS | DOPARSABLEEXPORTS))
 165                 if ((estat = tcp_callrpc(host, RPCPROG_MNT, mntvers,
 166                         RPCMNT_EXPORT, (xdrproc_t)xdr_void, NULL,
 167                         (xdrproc_t)xdr_exports, (char *)&exports)) != 0) {
 168                         clnt_perrno(estat);
 169                         errx(1, "can't do exports rpc");
 170                 }
 171
 172         /* Now just print out the results */
 173         if (rpcs & DODUMP) {
 174                 switch (type) {
 175                 case ALL:
 176                         printf("All mount points on %s:\n", host);
 177                         break;
 178                 case DIRS:
 179                         printf("Directories on %s:\n", host);
 180                         break;
 181                 default:
 182                         printf("Hosts on %s:\n", host);
 183                         break;
 184                 }
 185                 print_dump(mntdump);
 186         }
 187         if (rpcs & DOEXPORTS) {
 188                 printf("Exports list on %s:\n", host);
 189                 exp = exports;
 190                 while (exp) {
 191                         printf("%-35s", exp->ex_dirp);
 192                         grp = exp->ex_groups;
 193                         if (grp == NULL) {
 194                                 printf("Everyone\n");
 195                         } else {
 196                                 while (grp) {
 197                                         printf("%s ", grp->gr_name);
 198                                         grp = grp->gr_next;
 199                                 }
 200                                 printf("\n");
 201                         }
 202                         exp = exp->ex_next;
 203                 }
 204         }
 205         if (rpcs & DOPARSABLEEXPORTS) {
 206                 exp = exports;
 207                 while (exp) {
 208                         nbytes = strnvis(strvised, exp->ex_dirp,
 209                             sizeof(strvised), VIS_GLOB | VIS_NL);
 210                         if (nbytes == -1)
 211                                 err(1, "strsnvis");
 212                         printf("%s\n", strvised);
 213                         exp = exp->ex_next;
 214                 }
 215         }
 216         exit(0);
 217 }
 218
 219 /*
 220  * tcp_callrpc has the same interface as callrpc, but tries to
 221  * use tcp as transport method in order to handle large replies.
 222  */
 223 int
 224 tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
 225             xdrproc_t inproc, char *in, xdrproc_t outproc, char *out)
 226 {
 227         CLIENT *client;
 228         struct timeval timeout;
 229         int rval;
 230
 231         if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL &&
 232             (client = clnt_create(host, prognum, versnum, "udp")) == NULL)
 233                 return ((int) rpc_createerr.cf_stat);
 234
 235         timeout.tv_sec = 25;
 236         timeout.tv_usec = 0;
 237         rval = (int) clnt_call(client, procnum,
 238                                inproc, in,
 239                                outproc, out,
 240                                timeout);
 241         clnt_destroy(client);
 242         return rval;
 243 }
 244
 245 /*
 246  * Xdr routine for retrieving the mount dump list
 247  */
 248 int
 249 xdr_mntdump(XDR *xdrsp, struct mountlist **mlp)
 250 {
 251         struct mountlist *mp;
 252         struct mountlist *tp;
 253         struct mountlist **otp = NULL;
 254         int val, val2;
 255         int bool;
 256         char *strp;
 257
 258         *mlp = NULL;
 259         if (!xdr_bool(xdrsp, &bool))
 260                 return (0);
 261         while (bool) {
 262                 mp = (struct mountlist *)malloc(sizeof(struct mountlist));
 263                 if (mp == NULL)
 264                         return (0);
 265                 mp->ml_left = mp->ml_right = NULL;
 266                 strp = mp->ml_host;
 267                 if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
 268                         return (0);
 269                 strp = mp->ml_dirp;
 270                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 271                         return (0);
 272
 273                 /*
 274                  * Build a binary tree on sorted order of either host or dirp.
 275                  * Drop any duplications.
 276                  */
 277                 if (*mlp == NULL) {
 278                         *mlp = mp;
 279                 } else {
 280                         tp = *mlp;
 281                         while (tp) {
 282                                 val = strcmp(mp->ml_host, tp->ml_host);
 283                                 val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
 284                                 switch (type) {
 285                                 case ALL:
 286                                         if (val == 0) {
 287                                                 if (val2 == 0) {
 288                                                         free(mp);
 289                                                         goto next;
 290                                                 }
 291                                                 val = val2;
 292                                         }
 293                                         break;
 294                                 case DIRS:
 295                                         if (val2 == 0) {
 296                                                 free(mp);
 297                                                 goto next;
 298                                         }
 299                                         val = val2;
 300                                         break;
 301                                 default:
 302                                         if (val == 0) {
 303                                                 free(mp);
 304                                                 goto next;
 305                                         }
 306                                         break;
 307                                 }
 308                                 if (val < 0) {
 309                                         otp = &tp->ml_left;
 310                                         tp = tp->ml_left;
 311                                 } else {
 312                                         otp = &tp->ml_right;
 313                                         tp = tp->ml_right;
 314                                 }
 315                         }
 316                         *otp = mp;
 317                 }
 318 next:
 319                 if (!xdr_bool(xdrsp, &bool))
 320                         return (0);
 321         }
 322         return (1);
 323 }
 324
 325 /*
 326  * Xdr routine to retrieve exports list
 327  */
 328 int
 329 xdr_exports(XDR *xdrsp, struct exportslist **exp)
 330 {
 331         struct exportslist *ep;
 332         struct grouplist *gp;
 333         int bool, grpbool;
 334         char *strp;
 335
 336         *exp = NULL;
 337         if (!xdr_bool(xdrsp, &bool))
 338                 return (0);
 339         while (bool) {
 340                 ep = (struct exportslist *)malloc(sizeof(struct exportslist));
 341                 if (ep == NULL)
 342                         return (0);
 343                 ep->ex_groups = NULL;
 344                 strp = ep->ex_dirp;
 345                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 346                         return (0);
 347                 if (!xdr_bool(xdrsp, &grpbool))
 348                         return (0);
 349                 while (grpbool) {
 350                         gp = (struct grouplist *)malloc(sizeof(struct grouplist));
 351                         if (gp == NULL)
 352                                 return (0);
 353                         strp = gp->gr_name;
 354                         if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
 355                                 return (0);
 356                         gp->gr_next = ep->ex_groups;
 357                         ep->ex_groups = gp;
 358                         if (!xdr_bool(xdrsp, &grpbool))
 359                                 return (0);
 360                 }
 361                 ep->ex_next = *exp;
 362                 *exp = ep;
 363                 if (!xdr_bool(xdrsp, &bool))
 364                         return (0);
 365         }
 366         return (1);
 367 }
 368
 369 static void
 370 usage(void)
 371 {
 372         fprintf(stderr, "usage: showmount [-a | -d] [-e3] [host]\n");
 373         exit(1);
 374 }
 375
 376 /*
 377  * Print the binary tree in inorder so that output is sorted.
 378  */
 379 void
 380 print_dump(struct mountlist *mp)
 381 {
 382
 383         if (mp == NULL)
 384                 return;
 385         if (mp->ml_left)
 386                 print_dump(mp->ml_left);
 387         switch (type) {
 388         case ALL:
 389                 printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
 390                 break;
 391         case DIRS:
 392                 printf("%s\n", mp->ml_dirp);
 393                 break;
 394         default:
 395                 printf("%s\n", mp->ml_host);
 396                 break;
 397         }
 398         if (mp->ml_right)
 399                 print_dump(mp->ml_right);
 400 }