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. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#) Copyright (c) 1989, 1993, 1995 The Regents of the University of California.  All rights reserved.
  37  * @(#)showmount.c      8.3 (Berkeley) 3/29/95
  38  * $FreeBSD: src/usr.bin/showmount/showmount.c,v 1.16 2005/05/21 09:55:08 ru Exp $
  39  * $DragonFly: src/usr.bin/showmount/showmount.c,v 1.5 2005/09/05 04:22:07 swildner Exp $
  40  */
  41
  42 #include <sys/types.h>
  43 #include <sys/queue.h>
  44 #include <sys/file.h>
  45 #include <sys/socket.h>
  46 #include <sys/socketvar.h>
  47
  48 #include <err.h>
  49 #include <netdb.h>
  50 #include <rpc/rpc.h>
  51 #include <rpc/pmap_clnt.h>
  52 #include <rpc/pmap_prot.h>
  53 #include <nfs/rpcv2.h>
  54
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <string.h>
  58 #include <unistd.h>
  59
  60 /* Constant defs */
  61 #define ALL     1
  62 #define DIRS    2
  63
  64 #define DODUMP          0x1
  65 #define DOEXPORTS       0x2
  66
  67 struct mountlist {
  68         struct mountlist *ml_left;
  69         struct mountlist *ml_right;
  70         char    ml_host[RPCMNT_NAMELEN+1];
  71         char    ml_dirp[RPCMNT_PATHLEN+1];
  72 };
  73
  74 struct grouplist {
  75         struct grouplist *gr_next;
  76         char    gr_name[RPCMNT_NAMELEN+1];
  77 };
  78
  79 struct exportslist {
  80         struct exportslist *ex_next;
  81         struct grouplist *ex_groups;
  82         char    ex_dirp[RPCMNT_PATHLEN+1];
  83 };
  84
  85 static struct mountlist *mntdump;
  86 static struct exportslist *exports;
  87 static int type = 0;
  88
  89 void print_dump(struct mountlist *);
  90 static void usage(void);
  91 int xdr_mntdump(XDR *, struct mountlist **);
  92 int xdr_exports(XDR *, struct exportslist **);
  93 int tcp_callrpc(const char *, int, int, int, xdrproc_t, char *, xdrproc_t,
  94                 char *);
  95
  96 /*
  97  * This command queries the NFS mount daemon for it's mount list and/or
  98  * it's exports list and prints them out.
  99  * See "NFS: Network File System Protocol Specification, RFC1094, Appendix A"
 100  * and the "Network File System Protocol XXX.."
 101  * for detailed information on the protocol.
 102  */
 103 int
 104 main(int argc, char **argv)
 105 {
 106         struct exportslist *exp;
 107         struct grouplist *grp;
 108         int rpcs = 0, mntvers = 1;
 109         const char *host;
 110         int ch, estat;
 111
 112         while ((ch = getopt(argc, argv, "ade3")) != -1)
 113                 switch (ch) {
 114                 case 'a':
 115                         if (type == 0) {
 116                                 type = ALL;
 117                                 rpcs |= DODUMP;
 118                         } else
 119                                 usage();
 120                         break;
 121                 case 'd':
 122                         if (type == 0) {
 123                                 type = DIRS;
 124                                 rpcs |= DODUMP;
 125                         } else
 126                                 usage();
 127                         break;
 128                 case 'e':
 129                         rpcs |= DOEXPORTS;
 130                         break;
 131                 case '3':
 132                         mntvers = 3;
 133                         break;
 134                 case '?':
 135                 default:
 136                         usage();
 137                 }
 138         argc -= optind;
 139         argv += optind;
 140
 141         if (argc > 0)
 142                 host = *argv;
 143         else
 144                 host = "localhost";
 145
 146         if (rpcs == 0)
 147                 rpcs = DODUMP;
 148
 149         if (rpcs & DODUMP)
 150                 if ((estat = tcp_callrpc(host, RPCPROG_MNT, mntvers,
 151                         RPCMNT_DUMP, (xdrproc_t)xdr_void, NULL,
 152                         (xdrproc_t)xdr_mntdump, (char *)&mntdump)) != 0) {
 153                         clnt_perrno(estat);
 154                         errx(1, "can't do mountdump rpc");
 155                 }
 156         if (rpcs & DOEXPORTS)
 157                 if ((estat = tcp_callrpc(host, RPCPROG_MNT, mntvers,
 158                         RPCMNT_EXPORT, (xdrproc_t)xdr_void, NULL,
 159                         (xdrproc_t)xdr_exports, (char *)&exports)) != 0) {
 160                         clnt_perrno(estat);
 161                         errx(1, "can't do exports rpc");
 162                 }
 163
 164         /* Now just print out the results */
 165         if (rpcs & DODUMP) {
 166                 switch (type) {
 167                 case ALL:
 168                         printf("All mount points on %s:\n", host);
 169                         break;
 170                 case DIRS:
 171                         printf("Directories on %s:\n", host);
 172                         break;
 173                 default:
 174                         printf("Hosts on %s:\n", host);
 175                         break;
 176                 };
 177                 print_dump(mntdump);
 178         }
 179         if (rpcs & DOEXPORTS) {
 180                 printf("Exports list on %s:\n", host);
 181                 exp = exports;
 182                 while (exp) {
 183                         printf("%-35s", exp->ex_dirp);
 184                         grp = exp->ex_groups;
 185                         if (grp == NULL) {
 186                                 printf("Everyone\n");
 187                         } else {
 188                                 while (grp) {
 189                                         printf("%s ", grp->gr_name);
 190                                         grp = grp->gr_next;
 191                                 }
 192                                 printf("\n");
 193                         }
 194                         exp = exp->ex_next;
 195                 }
 196         }
 197         exit(0);
 198 }
 199
 200 /*
 201  * tcp_callrpc has the same interface as callrpc, but tries to
 202  * use tcp as transport method in order to handle large replies.
 203  */
 204 int
 205 tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
 206             xdrproc_t inproc, char *in, xdrproc_t outproc, char *out)
 207 {
 208         CLIENT *client;
 209         struct timeval timeout;
 210         int rval;
 211
 212         if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL &&
 213             (client = clnt_create(host, prognum, versnum, "udp")) == NULL)
 214                 return ((int) rpc_createerr.cf_stat);
 215
 216         timeout.tv_sec = 25;
 217         timeout.tv_usec = 0;
 218         rval = (int) clnt_call(client, procnum,
 219                                inproc, in,
 220                                outproc, out,
 221                                timeout);
 222         clnt_destroy(client);
 223         return rval;
 224 }
 225
 226 /*
 227  * Xdr routine for retrieving the mount dump list
 228  */
 229 int
 230 xdr_mntdump(XDR *xdrsp, struct mountlist **mlp)
 231 {
 232         struct mountlist *mp;
 233         struct mountlist *tp;
 234         struct mountlist **otp = NULL;
 235         int val, val2;
 236         int bool;
 237         char *strp;
 238
 239         *mlp = NULL;
 240         if (!xdr_bool(xdrsp, &bool))
 241                 return (0);
 242         while (bool) {
 243                 mp = (struct mountlist *)malloc(sizeof(struct mountlist));
 244                 if (mp == NULL)
 245                         return (0);
 246                 mp->ml_left = mp->ml_right = NULL;
 247                 strp = mp->ml_host;
 248                 if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
 249                         return (0);
 250                 strp = mp->ml_dirp;
 251                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 252                         return (0);
 253
 254                 /*
 255                  * Build a binary tree on sorted order of either host or dirp.
 256                  * Drop any duplications.
 257                  */
 258                 if (*mlp == NULL) {
 259                         *mlp = mp;
 260                 } else {
 261                         tp = *mlp;
 262                         while (tp) {
 263                                 val = strcmp(mp->ml_host, tp->ml_host);
 264                                 val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
 265                                 switch (type) {
 266                                 case ALL:
 267                                         if (val == 0) {
 268                                                 if (val2 == 0) {
 269                                                         free(mp);
 270                                                         goto next;
 271                                                 }
 272                                                 val = val2;
 273                                         }
 274                                         break;
 275                                 case DIRS:
 276                                         if (val2 == 0) {
 277                                                 free(mp);
 278                                                 goto next;
 279                                         }
 280                                         val = val2;
 281                                         break;
 282                                 default:
 283                                         if (val == 0) {
 284                                                 free(mp);
 285                                                 goto next;
 286                                         }
 287                                         break;
 288                                 };
 289                                 if (val < 0) {
 290                                         otp = &tp->ml_left;
 291                                         tp = tp->ml_left;
 292                                 } else {
 293                                         otp = &tp->ml_right;
 294                                         tp = tp->ml_right;
 295                                 }
 296                         }
 297                         *otp = mp;
 298                 }
 299 next:
 300                 if (!xdr_bool(xdrsp, &bool))
 301                         return (0);
 302         }
 303         return (1);
 304 }
 305
 306 /*
 307  * Xdr routine to retrieve exports list
 308  */
 309 int
 310 xdr_exports(XDR *xdrsp, struct exportslist **exp)
 311 {
 312         struct exportslist *ep;
 313         struct grouplist *gp;
 314         int bool, grpbool;
 315         char *strp;
 316
 317         *exp = NULL;
 318         if (!xdr_bool(xdrsp, &bool))
 319                 return (0);
 320         while (bool) {
 321                 ep = (struct exportslist *)malloc(sizeof(struct exportslist));
 322                 if (ep == NULL)
 323                         return (0);
 324                 ep->ex_groups = NULL;
 325                 strp = ep->ex_dirp;
 326                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 327                         return (0);
 328                 if (!xdr_bool(xdrsp, &grpbool))
 329                         return (0);
 330                 while (grpbool) {
 331                         gp = (struct grouplist *)malloc(sizeof(struct grouplist));
 332                         if (gp == NULL)
 333                                 return (0);
 334                         strp = gp->gr_name;
 335                         if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
 336                                 return (0);
 337                         gp->gr_next = ep->ex_groups;
 338                         ep->ex_groups = gp;
 339                         if (!xdr_bool(xdrsp, &grpbool))
 340                                 return (0);
 341                 }
 342                 ep->ex_next = *exp;
 343                 *exp = ep;
 344                 if (!xdr_bool(xdrsp, &bool))
 345                         return (0);
 346         }
 347         return (1);
 348 }
 349
 350 static void
 351 usage(void)
 352 {
 353         fprintf(stderr, "usage: showmount [-a | -d] [-e3] [host]\n");
 354         exit(1);
 355 }
 356
 357 /*
 358  * Print the binary tree in inorder so that output is sorted.
 359  */
 360 void
 361 print_dump(struct mountlist *mp)
 362 {
 363
 364         if (mp == NULL)
 365                 return;
 366         if (mp->ml_left)
 367                 print_dump(mp->ml_left);
 368         switch (type) {
 369         case ALL:
 370                 printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
 371                 break;
 372         case DIRS:
 373                 printf("%s\n", mp->ml_dirp);
 374                 break;
 375         default:
 376                 printf("%s\n", mp->ml_host);
 377                 break;
 378         };
 379         if (mp->ml_right)
 380                 print_dump(mp->ml_right);
 381 }