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 *nfs_sm_pgmtbl[] = {
  82         "showmount",
  83         "mount",
  84         "mountd",
  85         NULL,
  86 };
  87
  88 /*
  89  * Generate an RPC client handle connected to the mountd service
  90  * at @hostname, or die trying.
  91  *
  92  * Supports both AF_INET and AF_INET6 server addresses.
  93  */
  94 static CLIENT *nfs_get_mount_client(const char *hostname)
  95 {
  96         rpcprog_t program = nfs_getrpcbyname(MOUNTPROG, nfs_sm_pgmtbl);
  97         CLIENT *client;
  98
  99         client = clnt_create(hostname, program, MOUNTVERS, "tcp");
 100         if (client)
 101                 return client;
 102
 103         client = clnt_create(hostname, program, MOUNTVERS, "udp");
 104         if (client)
 105                 return client;
 106
 107         clnt_pcreateerror("clnt_create");
 108         exit(1);
 109 }
 110
 111 int main(int argc, char **argv)
 112 {
 113         char hostname_buf[MAXHOSTLEN];
 114         char *hostname;
 115         enum clnt_stat clnt_stat;
 116         struct timeval total_timeout;
 117         int c;
 118         CLIENT *mclient;
 119         groups grouplist;
 120         exports exportlist, exl;
 121         mountlist dumplist;
 122         mountlist list;
 123         int i;
 124         int n;
 125         int maxlen;
 126         char **dumpv;
 127
 128         program_name = argv[0];
 129         while ((c = getopt_long(argc, argv, "adehv", longopts, NULL)) != EOF) {
 130                 switch (c) {
 131                 case 'a':
 132                         aflag = 1;
 133                         break;
 134                 case 'd':
 135                         dflag = 1;
 136                         break;
 137                 case 'e':
 138                         eflag = 1;
 139                         break;
 140                 case 'h':
 141                         usage(stdout, 0);
 142                         break;
 143                 case 'v':
 144                         printf("%s\n", version);
 145                         exit(0);
 146                 case 0:
 147                         break;
 148                 case '?':
 149                 default:
 150                         usage(stderr, 1);
 151                         break;
 152                 }
 153         }
 154         argc -= optind;
 155         argv += optind;
 156
 157         switch (aflag + dflag + eflag) {
 158         case 0:
 159                 hflag = 1;
 160                 break;
 161         case 1:
 162                 break;
 163         default:
 164                 fprintf(stderr, "%s: only one of -a, -d or -e is allowed\n",
 165                         program_name);
 166                 exit(1);
 167                 break;
 168         }
 169
 170         switch (argc) {
 171         case 0:
 172                 if (gethostname(hostname_buf, MAXHOSTLEN) < 0) {
 173                         perror("getting hostname");
 174                         exit(1);
 175                 }
 176                 hostname = hostname_buf;
 177                 break;
 178         case 1:
 179                 hostname = argv[0];
 180                 break;
 181         default:
 182                 fprintf(stderr, "%s: only one hostname is allowed\n",
 183                         program_name);
 184                 exit(1);
 185                 break;
 186         }
 187
 188         mclient = nfs_get_mount_client(hostname);
 189         mclient->cl_auth = authunix_create_default();
 190         total_timeout.tv_sec = TOTAL_TIMEOUT;
 191         total_timeout.tv_usec = 0;
 192
 193         if (eflag) {
 194                 memset(&exportlist, '\0', sizeof(exportlist));
 195
 196                 clnt_stat = clnt_call(mclient, MOUNTPROC_EXPORT,
 197                         (xdrproc_t) xdr_void, NULL,
 198                         (xdrproc_t) xdr_exports, (caddr_t) &exportlist,
 199                         total_timeout);
 200                 if (clnt_stat != RPC_SUCCESS) {
 201                         clnt_perror(mclient, "rpc mount export");
 202                         clnt_destroy(mclient);
 203                         exit(1);
 204                 }
 205                 if (headers)
 206                         printf("Export list for %s:\n", hostname);
 207                 maxlen = 0;
 208                 for (exl = exportlist; exl; exl = exl->ex_next) {
 209                         if ((n = strlen(exl->ex_dir)) > maxlen)
 210                                 maxlen = n;
 211                 }
 212                 while (exportlist) {
 213                         printf("%-*s ", maxlen, exportlist->ex_dir);
 214                         grouplist = exportlist->ex_groups;
 215                         if (grouplist)
 216                                 while (grouplist) {
 217                                         printf("%s%s", grouplist->gr_name,
 218                                                 grouplist->gr_next ? "," : "");
 219                                         grouplist = grouplist->gr_next;
 220                                 }
 221                         else
 222                                 printf("(everyone)");
 223                         printf("\n");
 224                         exportlist = exportlist->ex_next;
 225                 }
 226                 clnt_destroy(mclient);
 227                 exit(0);
 228         }
 229
 230         memset(&dumplist, '\0', sizeof(dumplist));
 231         clnt_stat = clnt_call(mclient, MOUNTPROC_DUMP,
 232                 (xdrproc_t) xdr_void, NULL,
 233                 (xdrproc_t) xdr_mountlist, (caddr_t) &dumplist,
 234                 total_timeout);
 235         if (clnt_stat != RPC_SUCCESS) {
 236                 clnt_perror(mclient, "rpc mount dump");
 237                 clnt_destroy(mclient);
 238                 exit(1);
 239         }
 240         clnt_destroy(mclient);
 241
 242         n = 0;
 243         for (list = dumplist; list; list = list->ml_next)
 244                 n++;
 245         dumpv = (char **) calloc(n, sizeof (char *));
 246         if (n && !dumpv) {
 247                 fprintf(stderr, "%s: out of memory\n", program_name);
 248                 exit(1);
 249         }
 250         i = 0;
 251
 252         if (hflag) {
 253                 if (headers)
 254                         printf("Hosts on %s:\n", hostname);
 255                 while (dumplist) {
 256                         dumpv[i++] = dumplist->ml_hostname;
 257                         dumplist = dumplist->ml_next;
 258                 }
 259         }
 260         else if (aflag) {
 261                 if (headers)
 262                         printf("All mount points on %s:\n", hostname);
 263                 while (dumplist) {
 264                         char *t;
 265
 266                         t=malloc(strlen(dumplist->ml_hostname)+strlen(dumplist->ml_directory)+2);
 267                         if (!t)
 268                         {
 269                                 fprintf(stderr, "%s: out of memory\n", program_name);
 270                                 exit(1);
 271                         }
 272                         sprintf(t, "%s:%s", dumplist->ml_hostname, dumplist->ml_directory);
 273                         dumpv[i++] = t;
 274                         dumplist = dumplist->ml_next;
 275                 }
 276         }
 277         else if (dflag) {
 278                 if (headers)
 279                         printf("Directories on %s:\n", hostname);
 280                 while (dumplist) {
 281                         dumpv[i++] = dumplist->ml_directory;
 282                         dumplist = dumplist->ml_next;
 283                 }
 284         }
 285
 286         qsort(dumpv, n, sizeof (char *), dump_cmp);
 287
 288         for (i = 0; i < n; i++) {
 289                 if (i == 0 || strcmp(dumpv[i], dumpv[i - 1]) != 0)
 290                         printf("%s\n", dumpv[i]);
 291         }
 292         exit(0);
 293 }
 294