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 #include "config.h"
  17
  18 #include <stdio.h>
  19 #include <rpc/rpc.h>
  20 #include <sys/socket.h>
  21 #include <netinet/in.h>
  22 #include <sys/time.h>
  23 #include <string.h>
  24 #include <sys/types.h>
  25 #include <unistd.h>
  26 #include <memory.h>
  27 #include <stdlib.h>
  28
  29 #include <netdb.h>
  30 #include <arpa/inet.h>
  31 #include <errno.h>
  32 #include <getopt.h>
  33 #include <mount.h>
  34 #include <unistd.h>
  35
  36 static char *   version = "showmount for " VERSION;
  37 static char *   program_name;
  38 static int      headers = 1;
  39 static int      hflag = 0;
  40 static int      aflag = 0;
  41 static int      dflag = 0;
  42 static int      eflag = 0;
  43
  44 static struct option longopts[] =
  45 {
  46         { "all", 0, 0, 'a' },
  47         { "directories", 0, 0, 'd' },
  48         { "exports", 0, 0, 'e' },
  49         { "no-headers", 0, &headers, 0 },
  50         { "version", 0, 0, 'v' },
  51         { "help", 0, 0, 'h' },
  52         { NULL, 0, 0, 0 }
  53 };
  54
  55 #define MAXHOSTLEN 256
  56
  57 int dump_cmp(p, q)
  58 char **p;
  59 char **q;
  60 {
  61         return strcmp(*p, *q);
  62 }
  63
  64 static void usage(fp, n)
  65 FILE *fp;
  66 int n;
  67 {
  68         fprintf(fp, "Usage: %s [-adehv]\n", program_name);
  69         fprintf(fp, "       [--all] [--directories] [--exports]\n");
  70         fprintf(fp, "       [--no-headers] [--help] [--version] [host]\n");
  71         exit(n);
  72 }
  73
  74 int main(argc, argv)
  75 int argc;
  76 char **argv;
  77 {
  78         char hostname_buf[MAXHOSTLEN];
  79         char *hostname;
  80         enum clnt_stat clnt_stat;
  81         struct hostent *hp;
  82         struct sockaddr_in server_addr;
  83         int msock;
  84         struct timeval total_timeout;
  85         struct timeval pertry_timeout;
  86         int c;
  87         CLIENT *mclient;
  88         groups grouplist;
  89         exports exportlist, exl;
  90         mountlist dumplist;
  91         mountlist list;
  92         int i;
  93         int n;
  94         int maxlen;
  95         char **dumpv;
  96
  97         program_name = argv[0];
  98         while ((c = getopt_long(argc, argv, "adehv", longopts, NULL)) != EOF) {
  99                 switch (c) {
 100                 case 'a':
 101                         aflag = 1;
 102                         break;
 103                 case 'd':
 104                         dflag = 1;
 105                         break;
 106                 case 'e':
 107                         eflag = 1;
 108                         break;
 109                 case 'h':
 110                         usage(stdout, 0);
 111                         break;
 112                 case 'v':
 113                         printf("%s\n", version);
 114                         exit(0);
 115                 case 0:
 116                         break;
 117                 case '?':
 118                 default:
 119                         usage(stderr, 1);
 120                         break;
 121                 }
 122         }
 123         argc -= optind;
 124         argv += optind;
 125
 126         switch (aflag + dflag + eflag) {
 127         case 0:
 128                 hflag = 1;
 129                 break;
 130         case 1:
 131                 break;
 132         default:
 133                 fprintf(stderr, "%s: only one of -a, -d or -e is allowed\n",
 134                         program_name);
 135                 exit(1);
 136                 break;
 137         }
 138
 139         switch (argc) {
 140         case 0:
 141                 if (gethostname(hostname_buf, MAXHOSTLEN) < 0) {
 142                         perror("getting hostname");
 143                         exit(1);
 144                 }
 145                 hostname = hostname_buf;
 146                 break;
 147         case 1:
 148                 hostname = argv[0];
 149                 break;
 150         default:
 151                 fprintf(stderr, "%s: only one hostname is allowed\n",
 152                         program_name);
 153                 exit(1);
 154                 break;
 155         }
 156
 157         if (hostname[0] >= '0' && hostname[0] <= '9') {
 158                 server_addr.sin_family = AF_INET;
 159                 server_addr.sin_addr.s_addr = inet_addr(hostname);
 160         }
 161         else {
 162                 if ((hp = gethostbyname(hostname)) == NULL) {
 163                         fprintf(stderr, "%s: can't get address for %s\n",
 164                                 program_name, hostname);
 165                         exit(1);
 166                 }
 167                 server_addr.sin_family = AF_INET;
 168                 memcpy(&server_addr.sin_addr, hp->h_addr, hp->h_length);
 169         }
 170
 171         /* create mount deamon client */
 172
 173         server_addr.sin_port = 0;
 174         msock = RPC_ANYSOCK;
 175         if ((mclient = clnttcp_create(&server_addr,
 176             MOUNTPROG, MOUNTVERS, &msock, 0, 0)) == NULL) {
 177                 server_addr.sin_port = 0;
 178                 msock = RPC_ANYSOCK;
 179                 pertry_timeout.tv_sec = 3;
 180                 pertry_timeout.tv_usec = 0;
 181                 if ((mclient = clntudp_create(&server_addr,
 182                     MOUNTPROG, MOUNTVERS, pertry_timeout, &msock)) == NULL) {
 183                         clnt_pcreateerror("mount clntudp_create");
 184                         exit(1);
 185                 }
 186         }
 187         mclient->cl_auth = authunix_create_default();
 188         total_timeout.tv_sec = 20;
 189         total_timeout.tv_usec = 0;
 190
 191         if (eflag) {
 192                 memset(&exportlist, '\0', sizeof(exportlist));
 193                 clnt_stat = clnt_call(mclient, MOUNTPROC_EXPORT,
 194                         (xdrproc_t) xdr_void, NULL,
 195                         (xdrproc_t) xdr_exports, (caddr_t) &exportlist,
 196                         total_timeout);
 197                 if (clnt_stat != RPC_SUCCESS) {
 198                         clnt_perror(mclient, "rpc mount export");
 199                         exit(1);
 200                 }
 201                 if (headers)
 202                         printf("Export list for %s:\n", hostname);
 203                 maxlen = 0;
 204                 for (exl = exportlist; exl; exl = exl->ex_next) {
 205                         if ((n = strlen(exl->ex_dir)) > maxlen)
 206                                 maxlen = n;
 207                 }
 208                 while (exportlist) {
 209                         printf("%-*s ", maxlen, exportlist->ex_dir);
 210                         grouplist = exportlist->ex_groups;
 211                         if (grouplist)
 212                                 while (grouplist) {
 213                                         printf("%s%s", grouplist->gr_name,
 214                                                 grouplist->gr_next ? "," : "");
 215                                         grouplist = grouplist->gr_next;
 216                                 }
 217                         else
 218                                 printf("(everyone)");
 219                         printf("\n");
 220                         exportlist = exportlist->ex_next;
 221                 }
 222                 exit(0);
 223         }
 224
 225         memset(&dumplist, '\0', sizeof(dumplist));
 226         clnt_stat = clnt_call(mclient, MOUNTPROC_DUMP,
 227                 (xdrproc_t) xdr_void, NULL,
 228                 (xdrproc_t) xdr_mountlist, (caddr_t) &dumplist,
 229                 total_timeout);
 230         if (clnt_stat != RPC_SUCCESS) {
 231                 clnt_perror(mclient, "rpc mount dump");
 232                 exit(1);
 233         }
 234
 235         n = 0;
 236         for (list = dumplist; list; list = list->ml_next)
 237                 n++;
 238         dumpv = (char **) calloc(n, sizeof (char *));
 239         if (n && !dumpv) {
 240                 fprintf(stderr, "%s: out of memory\n", program_name);
 241                 exit(1);
 242         }
 243         i = 0;
 244
 245         if (hflag) {
 246                 if (headers)
 247                         printf("Hosts on %s:\n", hostname);
 248                 while (dumplist) {
 249                         dumpv[i++] = dumplist->ml_hostname;
 250                         dumplist = dumplist->ml_next;
 251                 }
 252         }
 253         else if (aflag) {
 254                 if (headers)
 255                         printf("All mount points on %s:\n", hostname);
 256                 while (dumplist) {
 257                         char *t;
 258
 259                         t=malloc(strlen(dumplist->ml_hostname)+strlen(dumplist->ml_directory)+2);
 260                         if (!t)
 261                         {
 262                                 fprintf(stderr, "%s: out of memory\n", program_name);
 263                                 exit(1);
 264                         }
 265                         sprintf(t, "%s:%s", dumplist->ml_hostname, dumplist->ml_directory);
 266                         dumpv[i++] = t;
 267                         dumplist = dumplist->ml_next;
 268                 }
 269         }
 270         else if (dflag) {
 271                 if (headers)
 272                         printf("Directories on %s:\n", hostname);
 273                 while (dumplist) {
 274                         dumpv[i++] = dumplist->ml_directory;
 275                         dumplist = dumplist->ml_next;
 276                 }
 277         }
 278
 279         qsort(dumpv, n, sizeof (char *), dump_cmp);
 280
 281         for (i = 0; i < n; i++) {
 282                 if (i == 0 || strcmp(dumpv[i], dumpv[i - 1]) != 0)
 283                         printf("%s\n", dumpv[i]);
 284         }
 285         exit(0);
 286 }
 287