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  */
  40
  41 #include <sys/types.h>
  42 #include <sys/queue.h>
  43 #include <sys/file.h>
  44 #include <sys/socket.h>
  45 #include <sys/socketvar.h>
  46
  47 #include <err.h>
  48 #include <netdb.h>
  49 #include <rpc/rpc.h>
  50 #include <rpc/pmap_clnt.h>
  51 #include <rpc/pmap_prot.h>
  52 #include <nfs/rpcv2.h>
  53
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include <unistd.h>
  58
  59 /* Constant defs */
  60 #define ALL     1
  61 #define DIRS    2
  62
  63 #define DODUMP          0x1
  64 #define DOEXPORTS       0x2
  65
  66 struct mountlist {
  67         struct mountlist *ml_left;
  68         struct mountlist *ml_right;
  69         char    ml_host[RPCMNT_NAMELEN+1];
  70         char    ml_dirp[RPCMNT_PATHLEN+1];
  71 };
  72
  73 struct grouplist {
  74         struct grouplist *gr_next;
  75         char    gr_name[RPCMNT_NAMELEN+1];
  76 };
  77
  78 struct exportslist {
  79         struct exportslist *ex_next;
  80         struct grouplist *ex_groups;
  81         char    ex_dirp[RPCMNT_PATHLEN+1];
  82 };
  83
  84 static struct mountlist *mntdump;
  85 static struct exportslist *exports;
  86 static int type = 0;
  87
  88 void print_dump(struct mountlist *);
  89 static void usage(void);
  90 int xdr_mntdump(XDR *, struct mountlist **);
  91 int xdr_exports(XDR *, struct exportslist **);
  92 int tcp_callrpc(const char *, int, int, int, xdrproc_t, char *, xdrproc_t,
  93                 char *);
  94
  95 /*
  96  * This command queries the NFS mount daemon for it's mount list and/or
  97  * it's exports list and prints them out.
  98  * See "NFS: Network File System Protocol Specification, RFC1094, Appendix A"
  99  * and the "Network File System Protocol XXX.."
 100  * for detailed information on the protocol.
 101  */
 102 int
 103 main(int argc, char **argv)
 104 {
 105         struct exportslist *exp;
 106         struct grouplist *grp;
 107         int rpcs = 0, mntvers = 1;
 108         const char *host;
 109         int ch, estat;
 110
 111         while ((ch = getopt(argc, argv, "ade3")) != -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 |= DOEXPORTS;
 129                         break;
 130                 case '3':
 131                         mntvers = 3;
 132                         break;
 133                 case '?':
 134                 default:
 135                         usage();
 136                 }
 137         argc -= optind;
 138         argv += optind;
 139
 140         if (argc > 0)
 141                 host = *argv;
 142         else
 143                 host = "localhost";
 144
 145         if (rpcs == 0)
 146                 rpcs = DODUMP;
 147
 148         if (rpcs & DODUMP)
 149                 if ((estat = tcp_callrpc(host, RPCPROG_MNT, mntvers,
 150                         RPCMNT_DUMP, (xdrproc_t)xdr_void, NULL,
 151                         (xdrproc_t)xdr_mntdump, (char *)&mntdump)) != 0) {
 152                         clnt_perrno(estat);
 153                         errx(1, "can't do mountdump rpc");
 154                 }
 155         if (rpcs & DOEXPORTS)
 156                 if ((estat = tcp_callrpc(host, RPCPROG_MNT, mntvers,
 157                         RPCMNT_EXPORT, (xdrproc_t)xdr_void, NULL,
 158                         (xdrproc_t)xdr_exports, (char *)&exports)) != 0) {
 159                         clnt_perrno(estat);
 160                         errx(1, "can't do exports rpc");
 161                 }
 162
 163         /* Now just print out the results */
 164         if (rpcs & DODUMP) {
 165                 switch (type) {
 166                 case ALL:
 167                         printf("All mount points on %s:\n", host);
 168                         break;
 169                 case DIRS:
 170                         printf("Directories on %s:\n", host);
 171                         break;
 172                 default:
 173                         printf("Hosts on %s:\n", host);
 174                         break;
 175                 }
 176                 print_dump(mntdump);
 177         }
 178         if (rpcs & DOEXPORTS) {
 179                 printf("Exports list on %s:\n", host);
 180                 exp = exports;
 181                 while (exp) {
 182                         printf("%-35s", exp->ex_dirp);
 183                         grp = exp->ex_groups;
 184                         if (grp == NULL) {
 185                                 printf("Everyone\n");
 186                         } else {
 187                                 while (grp) {
 188                                         printf("%s ", grp->gr_name);
 189                                         grp = grp->gr_next;
 190                                 }
 191                                 printf("\n");
 192                         }
 193                         exp = exp->ex_next;
 194                 }
 195         }
 196         exit(0);
 197 }
 198
 199 /*
 200  * tcp_callrpc has the same interface as callrpc, but tries to
 201  * use tcp as transport method in order to handle large replies.
 202  */
 203 int
 204 tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
 205             xdrproc_t inproc, char *in, xdrproc_t outproc, char *out)
 206 {
 207         CLIENT *client;
 208         struct timeval timeout;
 209         int rval;
 210
 211         if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL &&
 212             (client = clnt_create(host, prognum, versnum, "udp")) == NULL)
 213                 return ((int) rpc_createerr.cf_stat);
 214
 215         timeout.tv_sec = 25;
 216         timeout.tv_usec = 0;
 217         rval = (int) clnt_call(client, procnum,
 218                                inproc, in,
 219                                outproc, out,
 220                                timeout);
 221         clnt_destroy(client);
 222         return rval;
 223 }
 224
 225 /*
 226  * Xdr routine for retrieving the mount dump list
 227  */
 228 int
 229 xdr_mntdump(XDR *xdrsp, struct mountlist **mlp)
 230 {
 231         struct mountlist *mp;
 232         struct mountlist *tp;
 233         struct mountlist **otp = NULL;
 234         int val, val2;
 235         int bool;
 236         char *strp;
 237
 238         *mlp = NULL;
 239         if (!xdr_bool(xdrsp, &bool))
 240                 return (0);
 241         while (bool) {
 242                 mp = (struct mountlist *)malloc(sizeof(struct mountlist));
 243                 if (mp == NULL)
 244                         return (0);
 245                 mp->ml_left = mp->ml_right = NULL;
 246                 strp = mp->ml_host;
 247                 if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
 248                         return (0);
 249                 strp = mp->ml_dirp;
 250                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 251                         return (0);
 252
 253                 /*
 254                  * Build a binary tree on sorted order of either host or dirp.
 255                  * Drop any duplications.
 256                  */
 257                 if (*mlp == NULL) {
 258                         *mlp = mp;
 259                 } else {
 260                         tp = *mlp;
 261                         while (tp) {
 262                                 val = strcmp(mp->ml_host, tp->ml_host);
 263                                 val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
 264                                 switch (type) {
 265                                 case ALL:
 266                                         if (val == 0) {
 267                                                 if (val2 == 0) {
 268                                                         free(mp);
 269                                                         goto next;
 270                                                 }
 271                                                 val = val2;
 272                                         }
 273                                         break;
 274                                 case DIRS:
 275                                         if (val2 == 0) {
 276                                                 free(mp);
 277                                                 goto next;
 278                                         }
 279                                         val = val2;
 280                                         break;
 281                                 default:
 282                                         if (val == 0) {
 283                                                 free(mp);
 284                                                 goto next;
 285                                         }
 286                                         break;
 287                                 }
 288                                 if (val < 0) {
 289                                         otp = &tp->ml_left;
 290                                         tp = tp->ml_left;
 291                                 } else {
 292                                         otp = &tp->ml_right;
 293                                         tp = tp->ml_right;
 294                                 }
 295                         }
 296                         *otp = mp;
 297                 }
 298 next:
 299                 if (!xdr_bool(xdrsp, &bool))
 300                         return (0);
 301         }
 302         return (1);
 303 }
 304
 305 /*
 306  * Xdr routine to retrieve exports list
 307  */
 308 int
 309 xdr_exports(XDR *xdrsp, struct exportslist **exp)
 310 {
 311         struct exportslist *ep;
 312         struct grouplist *gp;
 313         int bool, grpbool;
 314         char *strp;
 315
 316         *exp = NULL;
 317         if (!xdr_bool(xdrsp, &bool))
 318                 return (0);
 319         while (bool) {
 320                 ep = (struct exportslist *)malloc(sizeof(struct exportslist));
 321                 if (ep == NULL)
 322                         return (0);
 323                 ep->ex_groups = NULL;
 324                 strp = ep->ex_dirp;
 325                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 326                         return (0);
 327                 if (!xdr_bool(xdrsp, &grpbool))
 328                         return (0);
 329                 while (grpbool) {
 330                         gp = (struct grouplist *)malloc(sizeof(struct grouplist));
 331                         if (gp == NULL)
 332                                 return (0);
 333                         strp = gp->gr_name;
 334                         if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
 335                                 return (0);
 336                         gp->gr_next = ep->ex_groups;
 337                         ep->ex_groups = gp;
 338                         if (!xdr_bool(xdrsp, &grpbool))
 339                                 return (0);
 340                 }
 341                 ep->ex_next = *exp;
 342                 *exp = ep;
 343                 if (!xdr_bool(xdrsp, &bool))
 344                         return (0);
 345         }
 346         return (1);
 347 }
 348
 349 static void
 350 usage(void)
 351 {
 352         fprintf(stderr, "usage: showmount [-a | -d] [-e3] [host]\n");
 353         exit(1);
 354 }
 355
 356 /*
 357  * Print the binary tree in inorder so that output is sorted.
 358  */
 359 void
 360 print_dump(struct mountlist *mp)
 361 {
 362
 363         if (mp == NULL)
 364                 return;
 365         if (mp->ml_left)
 366                 print_dump(mp->ml_left);
 367         switch (type) {
 368         case ALL:
 369                 printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
 370                 break;
 371         case DIRS:
 372                 printf("%s\n", mp->ml_dirp);
 373                 break;
 374         default:
 375                 printf("%s\n", mp->ml_host);
 376                 break;
 377         }
 378         if (mp->ml_right)
 379                 print_dump(mp->ml_right);
 380 }