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 (inet_aton(hostname, &server_addr.sin_addr)) {
 158                 server_addr.sin_family = AF_INET;
 159         }
 160         else {
 161                 if ((hp = gethostbyname(hostname)) == NULL) {
 162                         fprintf(stderr, "%s: can't get address for %s\n",
 163                                 program_name, hostname);
 164                         exit(1);
 165                 }
 166                 server_addr.sin_family = AF_INET;
 167                 memcpy(&server_addr.sin_addr, hp->h_addr, hp->h_length);
 168         }
 169
 170         /* create mount deamon client */
 171
 172         server_addr.sin_port = 0;
 173         msock = RPC_ANYSOCK;
 174         if ((mclient = clnttcp_create(&server_addr,
 175             MOUNTPROG, MOUNTVERS, &msock, 0, 0)) == NULL) {
 176                 server_addr.sin_port = 0;
 177                 msock = RPC_ANYSOCK;
 178                 pertry_timeout.tv_sec = 3;
 179                 pertry_timeout.tv_usec = 0;
 180                 if ((mclient = clntudp_create(&server_addr,
 181                     MOUNTPROG, MOUNTVERS, pertry_timeout, &msock)) == NULL) {
 182                         clnt_pcreateerror("mount clntudp_create");
 183                         exit(1);
 184                 }
 185         }
 186         mclient->cl_auth = authunix_create_default();
 187         total_timeout.tv_sec = 20;
 188         total_timeout.tv_usec = 0;
 189
 190         if (eflag) {
 191                 memset(&exportlist, '\0', sizeof(exportlist));
 192                 clnt_stat = clnt_call(mclient, MOUNTPROC_EXPORT,
 193                         (xdrproc_t) xdr_void, NULL,
 194                         (xdrproc_t) xdr_exports, (caddr_t) &exportlist,
 195                         total_timeout);
 196                 if (clnt_stat != RPC_SUCCESS) {
 197                         clnt_perror(mclient, "rpc mount export");
 198                         exit(1);
 199                 }
 200                 if (headers)
 201                         printf("Export list for %s:\n", hostname);
 202                 maxlen = 0;
 203                 for (exl = exportlist; exl; exl = exl->ex_next) {
 204                         if ((n = strlen(exl->ex_dir)) > maxlen)
 205                                 maxlen = n;
 206                 }
 207                 while (exportlist) {
 208                         printf("%-*s ", maxlen, exportlist->ex_dir);
 209                         grouplist = exportlist->ex_groups;
 210                         if (grouplist)
 211                                 while (grouplist) {
 212                                         printf("%s%s", grouplist->gr_name,
 213                                                 grouplist->gr_next ? "," : "");
 214                                         grouplist = grouplist->gr_next;
 215                                 }
 216                         else
 217                                 printf("(everyone)");
 218                         printf("\n");
 219                         exportlist = exportlist->ex_next;
 220                 }
 221                 exit(0);
 222         }
 223
 224         memset(&dumplist, '\0', sizeof(dumplist));
 225         clnt_stat = clnt_call(mclient, MOUNTPROC_DUMP,
 226                 (xdrproc_t) xdr_void, NULL,
 227                 (xdrproc_t) xdr_mountlist, (caddr_t) &dumplist,
 228                 total_timeout);
 229         if (clnt_stat != RPC_SUCCESS) {
 230                 clnt_perror(mclient, "rpc mount dump");
 231                 exit(1);
 232         }
 233
 234         n = 0;
 235         for (list = dumplist; list; list = list->ml_next)
 236                 n++;
 237         dumpv = (char **) calloc(n, sizeof (char *));
 238         if (n && !dumpv) {
 239                 fprintf(stderr, "%s: out of memory\n", program_name);
 240                 exit(1);
 241         }
 242         i = 0;
 243
 244         if (hflag) {
 245                 if (headers)
 246                         printf("Hosts on %s:\n", hostname);
 247                 while (dumplist) {
 248                         dumpv[i++] = dumplist->ml_hostname;
 249                         dumplist = dumplist->ml_next;
 250                 }
 251         }
 252         else if (aflag) {
 253                 if (headers)
 254                         printf("All mount points on %s:\n", hostname);
 255                 while (dumplist) {
 256                         char *t;
 257
 258                         t=malloc(strlen(dumplist->ml_hostname)+strlen(dumplist->ml_directory)+2);
 259                         if (!t)
 260                         {
 261                                 fprintf(stderr, "%s: out of memory\n", program_name);
 262                                 exit(1);
 263                         }
 264                         sprintf(t, "%s:%s", dumplist->ml_hostname, dumplist->ml_directory);
 265                         dumpv[i++] = t;
 266                         dumplist = dumplist->ml_next;
 267                 }
 268         }
 269         else if (dflag) {
 270                 if (headers)
 271                         printf("Directories on %s:\n", hostname);
 272                 while (dumplist) {
 273                         dumpv[i++] = dumplist->ml_directory;
 274                         dumplist = dumplist->ml_next;
 275                 }
 276         }
 277
 278         qsort(dumpv, n, sizeof (char *), dump_cmp);
 279
 280         for (i = 0; i < n; i++) {
 281                 if (i == 0 || strcmp(dumpv[i], dumpv[i - 1]) != 0)
 282                         printf("%s\n", dumpv[i]);
 283         }
 284         exit(0);
 285 }
 286