utils/showmount/showmount.c

   1 /*
   2  * showmount.c -- show mount information for an NFS server
   3  * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2, or (at your option)
   8  * any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #ifdef HAVE_CONFIG_H
  17 #include <config.h>
  18 #endif
  19
  20 #include <stdio.h>
  21 #include <rpc/rpc.h>
  22 #include <rpc/pmap_prot.h>
  23 #include <sys/socket.h>
  24 #include <netinet/in.h>
  25 #include <sys/time.h>
  26 #include <string.h>
  27 #include <sys/types.h>
  28 #include <unistd.h>
  29 #include <memory.h>
  30 #include <stdlib.h>
  31 #include <fcntl.h>
  32
  33 #include <netdb.h>
  34 #include <arpa/inet.h>
  35 #include <errno.h>
  36 #include <getopt.h>
  37 #include <mount.h>
  38 #include <unistd.h>
  39
  40 #include "nfsrpc.h"
  41
  42 #define TIMEOUT_UDP     3
  43 #define TOTAL_TIMEOUT   20
  44
  45 static char *   version = "showmount for " VERSION;
  46 static char *   program_name;
  47 static int      headers = 1;
  48 static int      hflag = 0;
  49 static int      aflag = 0;
  50 static int      dflag = 0;
  51 static int      eflag = 0;
  52
  53 static struct option longopts[] =
  54 {
  55         { "all", 0, 0, 'a' },
  56         { "directories", 0, 0, 'd' },
  57         { "exports", 0, 0, 'e' },
  58         { "no-headers", 0, &headers, 0 },
  59         { "version", 0, 0, 'v' },
  60         { "help", 0, 0, 'h' },
  61         { NULL, 0, 0, 0 }
  62 };
  63
  64 #define MAXHOSTLEN 256
  65
  66 static int dump_cmp(const void *pv, const void *qv)
  67 {
  68         const char **p = (const char **)pv;
  69         const char **q = (const char **)qv;
  70         return strcmp(*p, *q);
  71 }
  72
  73 static void usage(FILE *fp, int n)
  74 {
  75         fprintf(fp, "Usage: %s [-adehv]\n", program_name);
  76         fprintf(fp, "       [--all] [--directories] [--exports]\n");
  77         fprintf(fp, "       [--no-headers] [--help] [--version] [host]\n");
  78         exit(n);
  79 }
  80
  81 static const char *mount_pgm_tbl[] = {
  82         "showmount",
  83         "mount",
  84         "mountd",
  85         NULL,
  86 };
  87
  88 static const rpcvers_t mount_vers_tbl[] = {
  89         MOUNTVERS_NFSV3,
  90         MOUNTVERS_POSIX,
  91         MOUNTVERS,
  92 };
  93 static const unsigned int max_vers_tblsz =
  94         (sizeof(mount_vers_tbl)/sizeof(mount_vers_tbl[0]));
  95
  96 /*
  97  * Generate an RPC client handle connected to the mountd service
  98  * at @hostname, or die trying.
  99  *
 100  * Supports both AF_INET and AF_INET6 server addresses.
 101  */
 102 static CLIENT *nfs_get_mount_client(const char *hostname, rpcvers_t vers)
 103 {
 104         rpcprog_t program = nfs_getrpcbyname(MOUNTPROG, mount_pgm_tbl);
 105         CLIENT *client;
 106
 107         client = clnt_create(hostname, program, vers, "tcp");
 108         if (client)
 109                 return client;
 110         client = clnt_create(hostname, program, vers, "udp");
 111         if (client)
 112                 return client;
 113
 114         clnt_pcreateerror("clnt_create");
 115         exit(1);
 116 }
 117
 118 int main(int argc, char **argv)
 119 {
 120         char hostname_buf[MAXHOSTLEN];
 121         char *hostname;
 122         enum clnt_stat clnt_stat;
 123         struct timeval total_timeout;
 124         int c;
 125         CLIENT *mclient;
 126         groups grouplist;
 127         exports exportlist, exl;
 128         mountlist dumplist;
 129         mountlist list;
 130         int i;
 131         int n;
 132         int maxlen;
 133         int unsigned vers=0;
 134         char **dumpv;
 135
 136         program_name = argv[0];
 137         while ((c = getopt_long(argc, argv, "adehv", longopts, NULL)) != EOF) {
 138                 switch (c) {
 139                 case 'a':
 140                         aflag = 1;
 141                         break;
 142                 case 'd':
 143                         dflag = 1;
 144                         break;
 145                 case 'e':
 146                         eflag = 1;
 147                         break;
 148                 case 'h':
 149                         usage(stdout, 0);
 150                         break;
 151                 case 'v':
 152                         printf("%s\n", version);
 153                         exit(0);
 154                 case 0:
 155                         break;
 156                 case '?':
 157                 default:
 158                         usage(stderr, 1);
 159                         break;
 160                 }
 161         }
 162         argc -= optind;
 163         argv += optind;
 164
 165         switch (aflag + dflag + eflag) {
 166         case 0:
 167                 hflag = 1;
 168                 break;
 169         case 1:
 170                 break;
 171         default:
 172                 fprintf(stderr, "%s: only one of -a, -d or -e is allowed\n",
 173                         program_name);
 174                 exit(1);
 175                 break;
 176         }
 177
 178         switch (argc) {
 179         case 0:
 180                 if (gethostname(hostname_buf, MAXHOSTLEN) < 0) {
 181                         perror("getting hostname");
 182                         exit(1);
 183                 }
 184                 hostname = hostname_buf;
 185                 break;
 186         case 1:
 187                 hostname = argv[0];
 188                 break;
 189         default:
 190                 fprintf(stderr, "%s: only one hostname is allowed\n",
 191                         program_name);
 192                 exit(1);
 193                 break;
 194         }
 195
 196         mclient = nfs_get_mount_client(hostname, mount_vers_tbl[vers]);
 197         mclient->cl_auth = nfs_authsys_create();
 198         if (mclient->cl_auth == NULL) {
 199                 fprintf(stderr, "%s: unable to create RPC auth handle.\n",
 200                                 program_name);
 201                 clnt_destroy(mclient);
 202                 exit(1);
 203         }
 204         total_timeout.tv_sec = TOTAL_TIMEOUT;
 205         total_timeout.tv_usec = 0;
 206
 207 again:
 208         if (eflag) {
 209                 memset(&exportlist, '\0', sizeof(exportlist));
 210
 211                 clnt_stat = clnt_call(mclient, MOUNTPROC_EXPORT,
 212                         (xdrproc_t) xdr_void, NULL,
 213                         (xdrproc_t) xdr_exports, (caddr_t) &exportlist,
 214                         total_timeout);
 215                 if (clnt_stat == RPC_PROGVERSMISMATCH) {
 216                         if (++vers <  max_vers_tblsz) {
 217                                 (void)CLNT_CONTROL(mclient, CLSET_VERS,
 218                                         (void *)&mount_vers_tbl[vers]);
 219                                 goto again;
 220                                 }
 221                 }
 222                 if (clnt_stat != RPC_SUCCESS) {
 223                         clnt_perror(mclient, "rpc mount export");
 224                         clnt_destroy(mclient);
 225                         exit(1);
 226                 }
 227                 if (headers)
 228                         printf("Export list for %s:\n", hostname);
 229                 maxlen = 0;
 230                 for (exl = exportlist; exl; exl = exl->ex_next) {
 231                         if ((n = strlen(exl->ex_dir)) > maxlen)
 232                                 maxlen = n;
 233                 }
 234                 while (exportlist) {
 235                         printf("%-*s ", maxlen, exportlist->ex_dir);
 236                         grouplist = exportlist->ex_groups;
 237                         if (grouplist)
 238                                 while (grouplist) {
 239                                         printf("%s%s", grouplist->gr_name,
 240                                                 grouplist->gr_next ? "," : "");
 241                                         grouplist = grouplist->gr_next;
 242                                 }
 243                         else
 244                                 printf("(everyone)");
 245                         printf("\n");
 246                         exportlist = exportlist->ex_next;
 247                 }
 248                 clnt_destroy(mclient);
 249                 exit(0);
 250         }
 251
 252         memset(&dumplist, '\0', sizeof(dumplist));
 253         clnt_stat = clnt_call(mclient, MOUNTPROC_DUMP,
 254                 (xdrproc_t) xdr_void, NULL,
 255                 (xdrproc_t) xdr_mountlist, (caddr_t) &dumplist,
 256                 total_timeout);
 257         if (clnt_stat == RPC_PROGVERSMISMATCH) {
 258                 if (++vers <  max_vers_tblsz) {
 259                         (void)CLNT_CONTROL(mclient, CLSET_VERS,
 260                                 (void *)&mount_vers_tbl[vers]);
 261                         goto again;
 262                 }
 263         }
 264         if (clnt_stat != RPC_SUCCESS) {
 265                 clnt_perror(mclient, "rpc mount dump");
 266                 clnt_destroy(mclient);
 267                 exit(1);
 268         }
 269         clnt_destroy(mclient);
 270
 271         n = 0;
 272         for (list = dumplist; list; list = list->ml_next)
 273                 n++;
 274         dumpv = (char **) calloc(n, sizeof (char *));
 275         if (n && !dumpv) {
 276                 fprintf(stderr, "%s: out of memory\n", program_name);
 277                 exit(1);
 278         }
 279         i = 0;
 280
 281         if (hflag) {
 282                 if (headers)
 283                         printf("Hosts on %s:\n", hostname);
 284                 while (dumplist) {
 285                         dumpv[i++] = dumplist->ml_hostname;
 286                         dumplist = dumplist->ml_next;
 287                 }
 288         }
 289         else if (aflag) {
 290                 if (headers)
 291                         printf("All mount points on %s:\n", hostname);
 292                 while (dumplist) {
 293                         char *t;
 294
 295                         t=malloc(strlen(dumplist->ml_hostname)+strlen(dumplist->ml_directory)+2);
 296                         if (!t)
 297                         {
 298                                 fprintf(stderr, "%s: out of memory\n", program_name);
 299                                 exit(1);
 300                         }
 301                         sprintf(t, "%s:%s", dumplist->ml_hostname, dumplist->ml_directory);
 302                         dumpv[i++] = t;
 303                         dumplist = dumplist->ml_next;
 304                 }
 305         }
 306         else if (dflag) {
 307                 if (headers)
 308                         printf("Directories on %s:\n", hostname);
 309                 while (dumplist) {
 310                         dumpv[i++] = dumplist->ml_directory;
 311                         dumplist = dumplist->ml_next;
 312                 }
 313         }
 314
 315         qsort(dumpv, n, sizeof (char *), dump_cmp);
 316
 317         for (i = 0; i < n; i++) {
 318                 if (i == 0 || strcmp(dumpv[i], dumpv[i - 1]) != 0)
 319                         printf("%s\n", dumpv[i]);
 320         }
 321         exit(0);
 322 }
 323