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 <sys/socket.h>
  23 #include <netinet/in.h>
  24 #include <sys/time.h>
  25 #include <string.h>
  26 #include <sys/types.h>
  27 #include <unistd.h>
  28 #include <memory.h>
  29 #include <stdlib.h>
  30
  31 #include <netdb.h>
  32 #include <arpa/inet.h>
  33 #include <errno.h>
  34 #include <getopt.h>
  35 #include <mount.h>
  36 #include <unistd.h>
  37
  38 static char *   version = "showmount for " VERSION;
  39 static char *   program_name;
  40 static int      headers = 1;
  41 static int      hflag = 0;
  42 static int      aflag = 0;
  43 static int      dflag = 0;
  44 static int      eflag = 0;
  45
  46 static struct option longopts[] =
  47 {
  48         { "all", 0, 0, 'a' },
  49         { "directories", 0, 0, 'd' },
  50         { "exports", 0, 0, 'e' },
  51         { "no-headers", 0, &headers, 0 },
  52         { "version", 0, 0, 'v' },
  53         { "help", 0, 0, 'h' },
  54         { NULL, 0, 0, 0 }
  55 };
  56
  57 #define MAXHOSTLEN 256
  58
  59 int dump_cmp(p, q)
  60 char **p;
  61 char **q;
  62 {
  63         return strcmp(*p, *q);
  64 }
  65
  66 static void usage(fp, n)
  67 FILE *fp;
  68 int n;
  69 {
  70         fprintf(fp, "Usage: %s [-adehv]\n", program_name);
  71         fprintf(fp, "       [--all] [--directories] [--exports]\n");
  72         fprintf(fp, "       [--no-headers] [--help] [--version] [host]\n");
  73         exit(n);
  74 }
  75
  76 int main(argc, argv)
  77 int argc;
  78 char **argv;
  79 {
  80         char hostname_buf[MAXHOSTLEN];
  81         char *hostname;
  82         enum clnt_stat clnt_stat;
  83         struct hostent *hp;
  84         struct sockaddr_in server_addr;
  85         int msock;
  86         struct timeval total_timeout;
  87         struct timeval pertry_timeout;
  88         int c;
  89         CLIENT *mclient;
  90         groups grouplist;
  91         exports exportlist, exl;
  92         mountlist dumplist;
  93         mountlist list;
  94         int i;
  95         int n;
  96         int maxlen;
  97         char **dumpv;
  98
  99         program_name = argv[0];
 100         while ((c = getopt_long(argc, argv, "adehv", longopts, NULL)) != EOF) {
 101                 switch (c) {
 102                 case 'a':
 103                         aflag = 1;
 104                         break;
 105                 case 'd':
 106                         dflag = 1;
 107                         break;
 108                 case 'e':
 109                         eflag = 1;
 110                         break;
 111                 case 'h':
 112                         usage(stdout, 0);
 113                         break;
 114                 case 'v':
 115                         printf("%s\n", version);
 116                         exit(0);
 117                 case 0:
 118                         break;
 119                 case '?':
 120                 default:
 121                         usage(stderr, 1);
 122                         break;
 123                 }
 124         }
 125         argc -= optind;
 126         argv += optind;
 127
 128         switch (aflag + dflag + eflag) {
 129         case 0:
 130                 hflag = 1;
 131                 break;
 132         case 1:
 133                 break;
 134         default:
 135                 fprintf(stderr, "%s: only one of -a, -d or -e is allowed\n",
 136                         program_name);
 137                 exit(1);
 138                 break;
 139         }
 140
 141         switch (argc) {
 142         case 0:
 143                 if (gethostname(hostname_buf, MAXHOSTLEN) < 0) {
 144                         perror("getting hostname");
 145                         exit(1);
 146                 }
 147                 hostname = hostname_buf;
 148                 break;
 149         case 1:
 150                 hostname = argv[0];
 151                 break;
 152         default:
 153                 fprintf(stderr, "%s: only one hostname is allowed\n",
 154                         program_name);
 155                 exit(1);
 156                 break;
 157         }
 158
 159         if (inet_aton(hostname, &server_addr.sin_addr)) {
 160                 server_addr.sin_family = AF_INET;
 161         }
 162         else {
 163                 if ((hp = gethostbyname(hostname)) == NULL) {
 164                         fprintf(stderr, "%s: can't get address for %s\n",
 165                                 program_name, hostname);
 166                         exit(1);
 167                 }
 168                 server_addr.sin_family = AF_INET;
 169                 memcpy(&server_addr.sin_addr, hp->h_addr, hp->h_length);
 170         }
 171
 172         /* create mount deamon client */
 173
 174         server_addr.sin_port = 0;
 175         msock = RPC_ANYSOCK;
 176         if ((mclient = clnttcp_create(&server_addr,
 177             MOUNTPROG, MOUNTVERS, &msock, 0, 0)) == NULL) {
 178                 server_addr.sin_port = 0;
 179                 msock = RPC_ANYSOCK;
 180                 pertry_timeout.tv_sec = 3;
 181                 pertry_timeout.tv_usec = 0;
 182                 if ((mclient = clntudp_create(&server_addr,
 183                     MOUNTPROG, MOUNTVERS, pertry_timeout, &msock)) == NULL) {
 184                         clnt_pcreateerror("mount clntudp_create");
 185                         exit(1);
 186                 }
 187         }
 188         mclient->cl_auth = authunix_create_default();
 189         total_timeout.tv_sec = 20;
 190         total_timeout.tv_usec = 0;
 191
 192         if (eflag) {
 193                 memset(&exportlist, '\0', sizeof(exportlist));
 194                 clnt_stat = clnt_call(mclient, MOUNTPROC_EXPORT,
 195                         (xdrproc_t) xdr_void, NULL,
 196                         (xdrproc_t) xdr_exports, (caddr_t) &exportlist,
 197                         total_timeout);
 198                 if (clnt_stat != RPC_SUCCESS) {
 199                         clnt_perror(mclient, "rpc mount export");
 200                         exit(1);
 201                 }
 202                 if (headers)
 203                         printf("Export list for %s:\n", hostname);
 204                 maxlen = 0;
 205                 for (exl = exportlist; exl; exl = exl->ex_next) {
 206                         if ((n = strlen(exl->ex_dir)) > maxlen)
 207                                 maxlen = n;
 208                 }
 209                 while (exportlist) {
 210                         printf("%-*s ", maxlen, exportlist->ex_dir);
 211                         grouplist = exportlist->ex_groups;
 212                         if (grouplist)
 213                                 while (grouplist) {
 214                                         printf("%s%s", grouplist->gr_name,
 215                                                 grouplist->gr_next ? "," : "");
 216                                         grouplist = grouplist->gr_next;
 217                                 }
 218                         else
 219                                 printf("(everyone)");
 220                         printf("\n");
 221                         exportlist = exportlist->ex_next;
 222                 }
 223                 exit(0);
 224         }
 225
 226         memset(&dumplist, '\0', sizeof(dumplist));
 227         clnt_stat = clnt_call(mclient, MOUNTPROC_DUMP,
 228                 (xdrproc_t) xdr_void, NULL,
 229                 (xdrproc_t) xdr_mountlist, (caddr_t) &dumplist,
 230                 total_timeout);
 231         if (clnt_stat != RPC_SUCCESS) {
 232                 clnt_perror(mclient, "rpc mount dump");
 233                 exit(1);
 234         }
 235
 236         n = 0;
 237         for (list = dumplist; list; list = list->ml_next)
 238                 n++;
 239         dumpv = (char **) calloc(n, sizeof (char *));
 240         if (n && !dumpv) {
 241                 fprintf(stderr, "%s: out of memory\n", program_name);
 242                 exit(1);
 243         }
 244         i = 0;
 245
 246         if (hflag) {
 247                 if (headers)
 248                         printf("Hosts on %s:\n", hostname);
 249                 while (dumplist) {
 250                         dumpv[i++] = dumplist->ml_hostname;
 251                         dumplist = dumplist->ml_next;
 252                 }
 253         }
 254         else if (aflag) {
 255                 if (headers)
 256                         printf("All mount points on %s:\n", hostname);
 257                 while (dumplist) {
 258                         char *t;
 259
 260                         t=malloc(strlen(dumplist->ml_hostname)+strlen(dumplist->ml_directory)+2);
 261                         if (!t)
 262                         {
 263                                 fprintf(stderr, "%s: out of memory\n", program_name);
 264                                 exit(1);
 265                         }
 266                         sprintf(t, "%s:%s", dumplist->ml_hostname, dumplist->ml_directory);
 267                         dumpv[i++] = t;
 268                         dumplist = dumplist->ml_next;
 269                 }
 270         }
 271         else if (dflag) {
 272                 if (headers)
 273                         printf("Directories on %s:\n", hostname);
 274                 while (dumplist) {
 275                         dumpv[i++] = dumplist->ml_directory;
 276                         dumplist = dumplist->ml_next;
 277                 }
 278         }
 279
 280         qsort(dumpv, n, sizeof (char *), dump_cmp);
 281
 282         for (i = 0; i < n; i++) {
 283                 if (i == 0 || strcmp(dumpv[i], dumpv[i - 1]) != 0)
 284                         printf("%s\n", dumpv[i]);
 285         }
 286         exit(0);
 287 }
 288