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