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
  37 #ifndef lint
  38 static const char copyright[] =
  39 "@(#) Copyright (c) 1989, 1993, 1995\n\
  40         The Regents of the University of California.  All rights reserved.\n";
  41 #endif /* not lint */
  42
  43 #ifndef lint
  44 #if 0
  45 static char sccsid[] = "@(#)showmount.c 8.3 (Berkeley) 3/29/95";
  46 #endif
  47 static const char rcsid[] =
  48   "$FreeBSD$";
  49 #endif /* not lint */
  50
  51 #include <sys/types.h>
  52 #include <sys/queue.h>
  53 #include <sys/file.h>
  54 #include <sys/socket.h>
  55 #include <sys/socketvar.h>
  56
  57 #include <err.h>
  58 #include <netdb.h>
  59 #include <rpc/rpc.h>
  60 #include <rpc/pmap_clnt.h>
  61 #include <rpc/pmap_prot.h>
  62 #include <nfs/rpcv2.h>
  63
  64 #include <stdio.h>
  65 #include <stdlib.h>
  66 #include <string.h>
  67 #include <unistd.h>
  68
  69 /* Constant defs */
  70 #define ALL     1
  71 #define DIRS    2
  72
  73 #define DODUMP          0x1
  74 #define DOEXPORTS       0x2
  75
  76 struct mountlist {
  77         struct mountlist *ml_left;
  78         struct mountlist *ml_right;
  79         char    ml_host[RPCMNT_NAMELEN+1];
  80         char    ml_dirp[RPCMNT_PATHLEN+1];
  81 };
  82
  83 struct grouplist {
  84         struct grouplist *gr_next;
  85         char    gr_name[RPCMNT_NAMELEN+1];
  86 };
  87
  88 struct exportslist {
  89         struct exportslist *ex_next;
  90         struct grouplist *ex_groups;
  91         char    ex_dirp[RPCMNT_PATHLEN+1];
  92 };
  93
  94 static struct mountlist *mntdump;
  95 static struct exportslist *exports;
  96 static int type = 0;
  97
  98 void print_dump(struct mountlist *);
  99 static void usage(void);
 100 int xdr_mntdump(XDR *, struct mountlist **);
 101 int xdr_exports(XDR *, struct exportslist **);
 102 int tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
 103                 xdrproc_t inproc, char *in, xdrproc_t outproc, char *out);
 104
 105 /*
 106  * This command queries the NFS mount daemon for it's mount list and/or
 107  * it's exports list and prints them out.
 108  * See "NFS: Network File System Protocol Specification, RFC1094, Appendix A"
 109  * and the "Network File System Protocol XXX.."
 110  * for detailed information on the protocol.
 111  */
 112 int
 113 main(argc, argv)
 114         int argc;
 115         char **argv;
 116 {
 117         register struct exportslist *exp;
 118         register struct grouplist *grp;
 119         register int rpcs = 0, mntvers = 1;
 120         char ch;
 121         const char *host;
 122         int estat;
 123
 124         while ((ch = getopt(argc, argv, "ade3")) != -1)
 125                 switch((char)ch) {
 126                 case 'a':
 127                         if (type == 0) {
 128                                 type = ALL;
 129                                 rpcs |= DODUMP;
 130                         } else
 131                                 usage();
 132                         break;
 133                 case 'd':
 134                         if (type == 0) {
 135                                 type = DIRS;
 136                                 rpcs |= DODUMP;
 137                         } else
 138                                 usage();
 139                         break;
 140                 case 'e':
 141                         rpcs |= DOEXPORTS;
 142                         break;
 143                 case '3':
 144                         mntvers = 3;
 145                         break;
 146                 case '?':
 147                 default:
 148                         usage();
 149                 }
 150         argc -= optind;
 151         argv += optind;
 152
 153         if (argc > 0)
 154                 host = *argv;
 155         else
 156                 host = "localhost";
 157
 158         if (rpcs == 0)
 159                 rpcs = DODUMP;
 160
 161         if (rpcs & DODUMP)
 162                 if ((estat = tcp_callrpc(host, RPCPROG_MNT, mntvers,
 163                         RPCMNT_DUMP, xdr_void, (char *)0,
 164                         xdr_mntdump, (char *)&mntdump)) != 0) {
 165                         clnt_perrno(estat);
 166                         errx(1, "can't do mountdump rpc");
 167                 }
 168         if (rpcs & DOEXPORTS)
 169                 if ((estat = tcp_callrpc(host, RPCPROG_MNT, mntvers,
 170                         RPCMNT_EXPORT, xdr_void, (char *)0,
 171                         xdr_exports, (char *)&exports)) != 0) {
 172                         clnt_perrno(estat);
 173                         errx(1, "can't do exports rpc");
 174                 }
 175
 176         /* Now just print out the results */
 177         if (rpcs & DODUMP) {
 178                 switch (type) {
 179                 case ALL:
 180                         printf("All mount points on %s:\n", host);
 181                         break;
 182                 case DIRS:
 183                         printf("Directories on %s:\n", host);
 184                         break;
 185                 default:
 186                         printf("Hosts on %s:\n", host);
 187                         break;
 188                 };
 189                 print_dump(mntdump);
 190         }
 191         if (rpcs & DOEXPORTS) {
 192                 printf("Exports list on %s:\n", host);
 193                 exp = exports;
 194                 while (exp) {
 195                         printf("%-35s", exp->ex_dirp);
 196                         grp = exp->ex_groups;
 197                         if (grp == NULL) {
 198                                 printf("Everyone\n");
 199                         } else {
 200                                 while (grp) {
 201                                         printf("%s ", grp->gr_name);
 202                                         grp = grp->gr_next;
 203                                 }
 204                                 printf("\n");
 205                         }
 206                         exp = exp->ex_next;
 207                 }
 208         }
 209         exit(0);
 210 }
 211
 212 /*
 213  * tcp_callrpc has the same interface as callrpc, but tries to
 214  * use tcp as transport method in order to handle large replies.
 215  */
 216 int
 217 tcp_callrpc(host, prognum, versnum, procnum, inproc, in, outproc, out)
 218         const char *host;
 219         int prognum;
 220         int versnum;
 221         int procnum;
 222         xdrproc_t inproc;
 223         char *in;
 224         xdrproc_t outproc;
 225         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(xdrsp, mlp)
 250         XDR *xdrsp;
 251         struct mountlist **mlp;
 252 {
 253         register struct mountlist *mp;
 254         register struct mountlist *tp;
 255         register struct mountlist **otp;
 256         int val, val2;
 257         int bool;
 258         char *strp;
 259
 260         *mlp = (struct mountlist *)0;
 261         if (!xdr_bool(xdrsp, &bool))
 262                 return (0);
 263         while (bool) {
 264                 mp = (struct mountlist *)malloc(sizeof(struct mountlist));
 265                 if (mp == NULL)
 266                         return (0);
 267                 mp->ml_left = mp->ml_right = (struct mountlist *)0;
 268                 strp = mp->ml_host;
 269                 if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
 270                         return (0);
 271                 strp = mp->ml_dirp;
 272                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 273                         return (0);
 274
 275                 /*
 276                  * Build a binary tree on sorted order of either host or dirp.
 277                  * Drop any duplications.
 278                  */
 279                 if (*mlp == NULL) {
 280                         *mlp = mp;
 281                 } else {
 282                         tp = *mlp;
 283                         while (tp) {
 284                                 val = strcmp(mp->ml_host, tp->ml_host);
 285                                 val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
 286                                 switch (type) {
 287                                 case ALL:
 288                                         if (val == 0) {
 289                                                 if (val2 == 0) {
 290                                                         free((caddr_t)mp);
 291                                                         goto next;
 292                                                 }
 293                                                 val = val2;
 294                                         }
 295                                         break;
 296                                 case DIRS:
 297                                         if (val2 == 0) {
 298                                                 free((caddr_t)mp);
 299                                                 goto next;
 300                                         }
 301                                         val = val2;
 302                                         break;
 303                                 default:
 304                                         if (val == 0) {
 305                                                 free((caddr_t)mp);
 306                                                 goto next;
 307                                         }
 308                                         break;
 309                                 };
 310                                 if (val < 0) {
 311                                         otp = &tp->ml_left;
 312                                         tp = tp->ml_left;
 313                                 } else {
 314                                         otp = &tp->ml_right;
 315                                         tp = tp->ml_right;
 316                                 }
 317                         }
 318                         *otp = mp;
 319                 }
 320 next:
 321                 if (!xdr_bool(xdrsp, &bool))
 322                         return (0);
 323         }
 324         return (1);
 325 }
 326
 327 /*
 328  * Xdr routine to retrieve exports list
 329  */
 330 int
 331 xdr_exports(xdrsp, exp)
 332         XDR *xdrsp;
 333         struct exportslist **exp;
 334 {
 335         register struct exportslist *ep;
 336         register struct grouplist *gp;
 337         int bool, grpbool;
 338         char *strp;
 339
 340         *exp = (struct exportslist *)0;
 341         if (!xdr_bool(xdrsp, &bool))
 342                 return (0);
 343         while (bool) {
 344                 ep = (struct exportslist *)malloc(sizeof(struct exportslist));
 345                 if (ep == NULL)
 346                         return (0);
 347                 ep->ex_groups = (struct grouplist *)0;
 348                 strp = ep->ex_dirp;
 349                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 350                         return (0);
 351                 if (!xdr_bool(xdrsp, &grpbool))
 352                         return (0);
 353                 while (grpbool) {
 354                         gp = (struct grouplist *)malloc(sizeof(struct grouplist));
 355                         if (gp == NULL)
 356                                 return (0);
 357                         strp = gp->gr_name;
 358                         if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
 359                                 return (0);
 360                         gp->gr_next = ep->ex_groups;
 361                         ep->ex_groups = gp;
 362                         if (!xdr_bool(xdrsp, &grpbool))
 363                                 return (0);
 364                 }
 365                 ep->ex_next = *exp;
 366                 *exp = ep;
 367                 if (!xdr_bool(xdrsp, &bool))
 368                         return (0);
 369         }
 370         return (1);
 371 }
 372
 373 static void
 374 usage()
 375 {
 376         fprintf(stderr, "usage: showmount [-ade3] host\n");
 377         exit(1);
 378 }
 379
 380 /*
 381  * Print the binary tree in inorder so that output is sorted.
 382  */
 383 void
 384 print_dump(mp)
 385         struct mountlist *mp;
 386 {
 387
 388         if (mp == NULL)
 389                 return;
 390         if (mp->ml_left)
 391                 print_dump(mp->ml_left);
 392         switch (type) {
 393         case ALL:
 394                 printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
 395                 break;
 396         case DIRS:
 397                 printf("%s\n", mp->ml_dirp);
 398                 break;
 399         default:
 400                 printf("%s\n", mp->ml_host);
 401                 break;
 402         };
 403         if (mp->ml_right)
 404                 print_dump(mp->ml_right);
 405 }