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 1.8 1999/08/28 01:05:43 peter Exp $
  39  * $DragonFly: src/usr.bin/showmount/showmount.c,v 1.2 2003/06/17 04:29:31 dillon 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 __P((struct mountlist *));
  90 static void usage __P((void));
  91 int xdr_mntdump __P((XDR *, struct mountlist **));
  92 int xdr_exports __P((XDR *, struct exportslist **));
  93 int tcp_callrpc __P((char *host,
  94                      int prognum, int versnum, int procnum,
  95                      xdrproc_t inproc, char *in,
  96                      xdrproc_t outproc, char *out));
  97
  98 /*
  99  * This command queries the NFS mount daemon for it's mount list and/or
 100  * it's exports list and prints them out.
 101  * See "NFS: Network File System Protocol Specification, RFC1094, Appendix A"
 102  * and the "Network File System Protocol XXX.."
 103  * for detailed information on the protocol.
 104  */
 105 int
 106 main(argc, argv)
 107         int argc;
 108         char **argv;
 109 {
 110         register struct exportslist *exp;
 111         register struct grouplist *grp;
 112         register int rpcs = 0, mntvers = 1;
 113         char ch;
 114         char *host;
 115         int estat;
 116
 117         while ((ch = getopt(argc, argv, "ade3")) != -1)
 118                 switch((char)ch) {
 119                 case 'a':
 120                         if (type == 0) {
 121                                 type = ALL;
 122                                 rpcs |= DODUMP;
 123                         } else
 124                                 usage();
 125                         break;
 126                 case 'd':
 127                         if (type == 0) {
 128                                 type = DIRS;
 129                                 rpcs |= DODUMP;
 130                         } else
 131                                 usage();
 132                         break;
 133                 case 'e':
 134                         rpcs |= DOEXPORTS;
 135                         break;
 136                 case '3':
 137                         mntvers = 3;
 138                         break;
 139                 case '?':
 140                 default:
 141                         usage();
 142                 }
 143         argc -= optind;
 144         argv += optind;
 145
 146         if (argc > 0)
 147                 host = *argv;
 148         else
 149                 host = "localhost";
 150
 151         if (rpcs == 0)
 152                 rpcs = DODUMP;
 153
 154         if (rpcs & DODUMP)
 155                 if ((estat = tcp_callrpc(host, RPCPROG_MNT, mntvers,
 156                         RPCMNT_DUMP, xdr_void, (char *)0,
 157                         xdr_mntdump, (char *)&mntdump)) != 0) {
 158                         clnt_perrno(estat);
 159                         errx(1, "can't do mountdump rpc");
 160                 }
 161         if (rpcs & DOEXPORTS)
 162                 if ((estat = tcp_callrpc(host, RPCPROG_MNT, mntvers,
 163                         RPCMNT_EXPORT, xdr_void, (char *)0,
 164                         xdr_exports, (char *)&exports)) != 0) {
 165                         clnt_perrno(estat);
 166                         errx(1, "can't do exports rpc");
 167                 }
 168
 169         /* Now just print out the results */
 170         if (rpcs & DODUMP) {
 171                 switch (type) {
 172                 case ALL:
 173                         printf("All mount points on %s:\n", host);
 174                         break;
 175                 case DIRS:
 176                         printf("Directories on %s:\n", host);
 177                         break;
 178                 default:
 179                         printf("Hosts on %s:\n", host);
 180                         break;
 181                 };
 182                 print_dump(mntdump);
 183         }
 184         if (rpcs & DOEXPORTS) {
 185                 printf("Exports list on %s:\n", host);
 186                 exp = exports;
 187                 while (exp) {
 188                         printf("%-35s", exp->ex_dirp);
 189                         grp = exp->ex_groups;
 190                         if (grp == NULL) {
 191                                 printf("Everyone\n");
 192                         } else {
 193                                 while (grp) {
 194                                         printf("%s ", grp->gr_name);
 195                                         grp = grp->gr_next;
 196                                 }
 197                                 printf("\n");
 198                         }
 199                         exp = exp->ex_next;
 200                 }
 201         }
 202         exit(0);
 203 }
 204
 205 /*
 206  * tcp_callrpc has the same interface as callrpc, but tries to
 207  * use tcp as transport method in order to handle large replies.
 208  */
 209
 210 int
 211 tcp_callrpc(host, prognum, versnum, procnum, inproc, in, outproc, out)
 212         char *host;
 213         int prognum;
 214         int versnum;
 215         int procnum;
 216         xdrproc_t inproc;
 217         char *in;
 218         xdrproc_t outproc;
 219         char *out;
 220 {
 221         struct hostent *hp;
 222         struct sockaddr_in server_addr;
 223         CLIENT *client;
 224         int sock;
 225         struct timeval timeout;
 226         int rval;
 227
 228         hp = gethostbyname(host);
 229
 230         if (!hp)
 231                 return ((int) RPC_UNKNOWNHOST);
 232
 233         memset(&server_addr,0,sizeof(server_addr));
 234         memcpy((char *) &server_addr.sin_addr,
 235                hp->h_addr,
 236                hp->h_length);
 237         server_addr.sin_len = sizeof(struct sockaddr_in);
 238         server_addr.sin_family =AF_INET;
 239         server_addr.sin_port = 0;
 240
 241         sock = RPC_ANYSOCK;
 242
 243         client = clnttcp_create(&server_addr,
 244                                 (u_long) prognum,
 245                                 (u_long) versnum, &sock, 0, 0);
 246         if (!client) {
 247                 timeout.tv_sec = 5;
 248                 timeout.tv_usec = 0;
 249                 server_addr.sin_port = 0;
 250                 sock = RPC_ANYSOCK;
 251                 client = clntudp_create(&server_addr,
 252                                         (u_long) prognum,
 253                                         (u_long) versnum,
 254                                         timeout,
 255                                         &sock);
 256         }
 257         if (!client)
 258                 return ((int) rpc_createerr.cf_stat);
 259
 260         timeout.tv_sec = 25;
 261         timeout.tv_usec = 0;
 262         rval = (int) clnt_call(client, procnum,
 263                                inproc, in,
 264                                outproc, out,
 265                                timeout);
 266         clnt_destroy(client);
 267         return rval;
 268 }
 269
 270 /*
 271  * Xdr routine for retrieving the mount dump list
 272  */
 273 int
 274 xdr_mntdump(xdrsp, mlp)
 275         XDR *xdrsp;
 276         struct mountlist **mlp;
 277 {
 278         register struct mountlist *mp;
 279         register struct mountlist *tp;
 280         register struct mountlist **otp;
 281         int val, val2;
 282         int bool;
 283         char *strp;
 284
 285         *mlp = (struct mountlist *)0;
 286         if (!xdr_bool(xdrsp, &bool))
 287                 return (0);
 288         while (bool) {
 289                 mp = (struct mountlist *)malloc(sizeof(struct mountlist));
 290                 if (mp == NULL)
 291                         return (0);
 292                 mp->ml_left = mp->ml_right = (struct mountlist *)0;
 293                 strp = mp->ml_host;
 294                 if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
 295                         return (0);
 296                 strp = mp->ml_dirp;
 297                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 298                         return (0);
 299
 300                 /*
 301                  * Build a binary tree on sorted order of either host or dirp.
 302                  * Drop any duplications.
 303                  */
 304                 if (*mlp == NULL) {
 305                         *mlp = mp;
 306                 } else {
 307                         tp = *mlp;
 308                         while (tp) {
 309                                 val = strcmp(mp->ml_host, tp->ml_host);
 310                                 val2 = strcmp(mp->ml_dirp, tp->ml_dirp);
 311                                 switch (type) {
 312                                 case ALL:
 313                                         if (val == 0) {
 314                                                 if (val2 == 0) {
 315                                                         free((caddr_t)mp);
 316                                                         goto next;
 317                                                 }
 318                                                 val = val2;
 319                                         }
 320                                         break;
 321                                 case DIRS:
 322                                         if (val2 == 0) {
 323                                                 free((caddr_t)mp);
 324                                                 goto next;
 325                                         }
 326                                         val = val2;
 327                                         break;
 328                                 default:
 329                                         if (val == 0) {
 330                                                 free((caddr_t)mp);
 331                                                 goto next;
 332                                         }
 333                                         break;
 334                                 };
 335                                 if (val < 0) {
 336                                         otp = &tp->ml_left;
 337                                         tp = tp->ml_left;
 338                                 } else {
 339                                         otp = &tp->ml_right;
 340                                         tp = tp->ml_right;
 341                                 }
 342                         }
 343                         *otp = mp;
 344                 }
 345 next:
 346                 if (!xdr_bool(xdrsp, &bool))
 347                         return (0);
 348         }
 349         return (1);
 350 }
 351
 352 /*
 353  * Xdr routine to retrieve exports list
 354  */
 355 int
 356 xdr_exports(xdrsp, exp)
 357         XDR *xdrsp;
 358         struct exportslist **exp;
 359 {
 360         register struct exportslist *ep;
 361         register struct grouplist *gp;
 362         int bool, grpbool;
 363         char *strp;
 364
 365         *exp = (struct exportslist *)0;
 366         if (!xdr_bool(xdrsp, &bool))
 367                 return (0);
 368         while (bool) {
 369                 ep = (struct exportslist *)malloc(sizeof(struct exportslist));
 370                 if (ep == NULL)
 371                         return (0);
 372                 ep->ex_groups = (struct grouplist *)0;
 373                 strp = ep->ex_dirp;
 374                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 375                         return (0);
 376                 if (!xdr_bool(xdrsp, &grpbool))
 377                         return (0);
 378                 while (grpbool) {
 379                         gp = (struct grouplist *)malloc(sizeof(struct grouplist));
 380                         if (gp == NULL)
 381                                 return (0);
 382                         strp = gp->gr_name;
 383                         if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
 384                                 return (0);
 385                         gp->gr_next = ep->ex_groups;
 386                         ep->ex_groups = gp;
 387                         if (!xdr_bool(xdrsp, &grpbool))
 388                                 return (0);
 389                 }
 390                 ep->ex_next = *exp;
 391                 *exp = ep;
 392                 if (!xdr_bool(xdrsp, &bool))
 393                         return (0);
 394         }
 395         return (1);
 396 }
 397
 398 static void
 399 usage()
 400 {
 401         fprintf(stderr, "usage: showmount [-ade3] host\n");
 402         exit(1);
 403 }
 404
 405 /*
 406  * Print the binary tree in inorder so that output is sorted.
 407  */
 408 void
 409 print_dump(mp)
 410         struct mountlist *mp;
 411 {
 412
 413         if (mp == NULL)
 414                 return;
 415         if (mp->ml_left)
 416                 print_dump(mp->ml_left);
 417         switch (type) {
 418         case ALL:
 419                 printf("%s:%s\n", mp->ml_host, mp->ml_dirp);
 420                 break;
 421         case DIRS:
 422                 printf("%s\n", mp->ml_dirp);
 423                 break;
 424         default:
 425                 printf("%s\n", mp->ml_host);
 426                 break;
 427         };
 428         if (mp->ml_right)
 429                 print_dump(mp->ml_right);
 430 }