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