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 /*
  82  *  Perform a non-blocking connect on the socket fd.
  83  *
  84  *  tout contains the timeout.  It will be modified to contain the time
  85  *  remaining (i.e. time provided - time elasped).
  86  *
  87  *  Returns zero on success; otherwise, -1 is returned and errno is set
  88  *  to reflect the nature of the error.
  89  */
  90 static int connect_nb(int fd, struct sockaddr_in *addr, struct timeval *tout)
  91 {
  92         int flags, ret;
  93         socklen_t len;
  94         fd_set rset;
  95
  96         flags = fcntl(fd, F_GETFL, 0);
  97         if (flags < 0)
  98                 return -1;
  99
 100         ret = fcntl(fd, F_SETFL, flags | O_NONBLOCK);
 101         if (ret < 0)
 102                 return -1;
 103
 104         /*
 105          * From here on subsequent sys calls could change errno so
 106          * we set ret = -errno to capture it in case we decide to
 107          * use it later.
 108          */
 109         len = sizeof(struct sockaddr);
 110         ret = connect(fd, (struct sockaddr *)addr, len);
 111         if (ret < 0 && errno != EINPROGRESS) {
 112                 ret = -1;
 113                 goto done;
 114         }
 115
 116         if (ret == 0)
 117                 goto done;
 118
 119         /* now wait */
 120         FD_ZERO(&rset);
 121         FD_SET(fd, &rset);
 122
 123         ret = select(fd + 1, NULL, &rset, NULL, tout);
 124         if (ret <= 0) {
 125                 if (ret == 0)
 126                         errno = ETIMEDOUT;
 127                 ret = -1;
 128                 goto done;
 129         }
 130
 131         if (FD_ISSET(fd, &rset)) {
 132                 int status;
 133
 134                 len = sizeof(ret);
 135                 status = getsockopt(fd, SOL_SOCKET, SO_ERROR, &ret, &len);
 136                 if (status < 0) {
 137                         ret = -1;
 138                         goto done;
 139                 }
 140
 141                 /* Oops - something wrong with connect */
 142                 if (ret != 0) {
 143                         errno = ret;
 144                         ret = -1;
 145                 }
 146         }
 147
 148 done:
 149         fcntl(fd, F_SETFL, flags);
 150         return ret;
 151 }
 152
 153 int main(int argc, char **argv)
 154 {
 155         char hostname_buf[MAXHOSTLEN];
 156         char *hostname;
 157         enum clnt_stat clnt_stat;
 158         struct hostent *hp;
 159         struct sockaddr_in server_addr;
 160         int ret, msock;
 161         struct timeval total_timeout;
 162         struct timeval pertry_timeout;
 163         int c;
 164         CLIENT *mclient;
 165         groups grouplist;
 166         exports exportlist, exl;
 167         mountlist dumplist;
 168         mountlist list;
 169         int i;
 170         int n;
 171         int maxlen;
 172         char **dumpv;
 173
 174         program_name = argv[0];
 175         while ((c = getopt_long(argc, argv, "adehv", longopts, NULL)) != EOF) {
 176                 switch (c) {
 177                 case 'a':
 178                         aflag = 1;
 179                         break;
 180                 case 'd':
 181                         dflag = 1;
 182                         break;
 183                 case 'e':
 184                         eflag = 1;
 185                         break;
 186                 case 'h':
 187                         usage(stdout, 0);
 188                         break;
 189                 case 'v':
 190                         printf("%s\n", version);
 191                         exit(0);
 192                 case 0:
 193                         break;
 194                 case '?':
 195                 default:
 196                         usage(stderr, 1);
 197                         break;
 198                 }
 199         }
 200         argc -= optind;
 201         argv += optind;
 202
 203         switch (aflag + dflag + eflag) {
 204         case 0:
 205                 hflag = 1;
 206                 break;
 207         case 1:
 208                 break;
 209         default:
 210                 fprintf(stderr, "%s: only one of -a, -d or -e is allowed\n",
 211                         program_name);
 212                 exit(1);
 213                 break;
 214         }
 215
 216         switch (argc) {
 217         case 0:
 218                 if (gethostname(hostname_buf, MAXHOSTLEN) < 0) {
 219                         perror("getting hostname");
 220                         exit(1);
 221                 }
 222                 hostname = hostname_buf;
 223                 break;
 224         case 1:
 225                 hostname = argv[0];
 226                 break;
 227         default:
 228                 fprintf(stderr, "%s: only one hostname is allowed\n",
 229                         program_name);
 230                 exit(1);
 231                 break;
 232         }
 233
 234         if (inet_aton(hostname, &server_addr.sin_addr)) {
 235                 server_addr.sin_family = AF_INET;
 236         }
 237         else {
 238                 if ((hp = gethostbyname(hostname)) == NULL) {
 239                         fprintf(stderr, "%s: can't get address for %s\n",
 240                                 program_name, hostname);
 241                         exit(1);
 242                 }
 243                 server_addr.sin_family = AF_INET;
 244                 memcpy(&server_addr.sin_addr, hp->h_addr, hp->h_length);
 245         }
 246
 247         /* create mount deamon client */
 248
 249         mclient = NULL;
 250         msock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 251         if (msock != -1) {
 252                 if (nfs_getport_ping((struct sockaddr *)&server_addr,
 253                                         sizeof(server_addr), MOUNTPROG,
 254                                         MOUNTVERS, IPPROTO_TCP)) {
 255                         ret = connect_nb(msock, &server_addr, 0);
 256                         if (ret == 0) /* success */
 257                                 mclient = clnttcp_create(&server_addr,
 258                                                 MOUNTPROG, MOUNTVERS, &msock,
 259                                                 0, 0);
 260                         else
 261                                 close(msock);
 262                 } else
 263                         close(msock);
 264         }
 265
 266         if (!mclient) {
 267                 if (nfs_getport_ping((struct sockaddr *)&server_addr,
 268                                         sizeof(server_addr), MOUNTPROG,
 269                                         MOUNTVERS, IPPROTO_UDP)) {
 270                         clnt_pcreateerror("showmount");
 271                         exit(1);
 272                 }
 273                 msock = RPC_ANYSOCK;
 274                 pertry_timeout.tv_sec = TIMEOUT_UDP;
 275                 pertry_timeout.tv_usec = 0;
 276                 if ((mclient = clntudp_create(&server_addr,
 277                     MOUNTPROG, MOUNTVERS, pertry_timeout, &msock)) == NULL) {
 278                         clnt_pcreateerror("mount clntudp_create");
 279                         exit(1);
 280                 }
 281         }
 282         mclient->cl_auth = authunix_create_default();
 283         total_timeout.tv_sec = TOTAL_TIMEOUT;
 284         total_timeout.tv_usec = 0;
 285
 286         if (eflag) {
 287                 memset(&exportlist, '\0', sizeof(exportlist));
 288
 289                 clnt_stat = clnt_call(mclient, MOUNTPROC_EXPORT,
 290                         (xdrproc_t) xdr_void, NULL,
 291                         (xdrproc_t) xdr_exports, (caddr_t) &exportlist,
 292                         total_timeout);
 293                 if (clnt_stat != RPC_SUCCESS) {
 294                         clnt_perror(mclient, "rpc mount export");
 295                         clnt_destroy(mclient);
 296                         exit(1);
 297                 }
 298                 if (headers)
 299                         printf("Export list for %s:\n", hostname);
 300                 maxlen = 0;
 301                 for (exl = exportlist; exl; exl = exl->ex_next) {
 302                         if ((n = strlen(exl->ex_dir)) > maxlen)
 303                                 maxlen = n;
 304                 }
 305                 while (exportlist) {
 306                         printf("%-*s ", maxlen, exportlist->ex_dir);
 307                         grouplist = exportlist->ex_groups;
 308                         if (grouplist)
 309                                 while (grouplist) {
 310                                         printf("%s%s", grouplist->gr_name,
 311                                                 grouplist->gr_next ? "," : "");
 312                                         grouplist = grouplist->gr_next;
 313                                 }
 314                         else
 315                                 printf("(everyone)");
 316                         printf("\n");
 317                         exportlist = exportlist->ex_next;
 318                 }
 319                 clnt_destroy(mclient);
 320                 exit(0);
 321         }
 322
 323         memset(&dumplist, '\0', sizeof(dumplist));
 324         clnt_stat = clnt_call(mclient, MOUNTPROC_DUMP,
 325                 (xdrproc_t) xdr_void, NULL,
 326                 (xdrproc_t) xdr_mountlist, (caddr_t) &dumplist,
 327                 total_timeout);
 328         if (clnt_stat != RPC_SUCCESS) {
 329                 clnt_perror(mclient, "rpc mount dump");
 330                 clnt_destroy(mclient);
 331                 exit(1);
 332         }
 333         clnt_destroy(mclient);
 334
 335         n = 0;
 336         for (list = dumplist; list; list = list->ml_next)
 337                 n++;
 338         dumpv = (char **) calloc(n, sizeof (char *));
 339         if (n && !dumpv) {
 340                 fprintf(stderr, "%s: out of memory\n", program_name);
 341                 exit(1);
 342         }
 343         i = 0;
 344
 345         if (hflag) {
 346                 if (headers)
 347                         printf("Hosts on %s:\n", hostname);
 348                 while (dumplist) {
 349                         dumpv[i++] = dumplist->ml_hostname;
 350                         dumplist = dumplist->ml_next;
 351                 }
 352         }
 353         else if (aflag) {
 354                 if (headers)
 355                         printf("All mount points on %s:\n", hostname);
 356                 while (dumplist) {
 357                         char *t;
 358
 359                         t=malloc(strlen(dumplist->ml_hostname)+strlen(dumplist->ml_directory)+2);
 360                         if (!t)
 361                         {
 362                                 fprintf(stderr, "%s: out of memory\n", program_name);
 363                                 exit(1);
 364                         }
 365                         sprintf(t, "%s:%s", dumplist->ml_hostname, dumplist->ml_directory);
 366                         dumpv[i++] = t;
 367                         dumplist = dumplist->ml_next;
 368                 }
 369         }
 370         else if (dflag) {
 371                 if (headers)
 372                         printf("Directories on %s:\n", hostname);
 373                 while (dumplist) {
 374                         dumpv[i++] = dumplist->ml_directory;
 375                         dumplist = dumplist->ml_next;
 376                 }
 377         }
 378
 379         qsort(dumpv, n, sizeof (char *), dump_cmp);
 380
 381         for (i = 0; i < n; i++) {
 382                 if (i == 0 || strcmp(dumpv[i], dumpv[i - 1]) != 0)
 383                         printf("%s\n", dumpv[i]);
 384         }
 385         exit(0);
 386 }
 387