mount/nfsmount.c

   1 /*
   2  * nfsmount.c -- Linux NFS mount
   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  * Wed Feb  8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port
  16  * numbers to be specified on the command line.
  17  *
  18  * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>:
  19  * Omit the call to connect() for Linux version 1.3.11 or later.
  20  *
  21  * Wed Oct  1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com>
  22  * Implemented the "bg", "fg" and "retry" mount options for NFS.
  23  *
  24  * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
  25  * - added Native Language Support
  26  *
  27  * Modified by Olaf Kirch and Trond Myklebust for new NFS code,
  28  * plus NFSv3 stuff.
  29  */
  30
  31 /*
  32  * nfsmount.c,v 1.1.1.1 1993/11/18 08:40:51 jrs Exp
  33  */
  34
  35 #include <unistd.h>
  36 #include <stdio.h>
  37 #include <string.h>
  38 #include <errno.h>
  39 #include <netdb.h>
  40 #include <rpc/rpc.h>
  41 #include <rpc/pmap_prot.h>
  42 #include <rpc/pmap_clnt.h>
  43 #include <sys/socket.h>
  44 #include <sys/time.h>
  45 #include <sys/utsname.h>
  46 #include <sys/stat.h>
  47 #include <netinet/in.h>
  48 #include <arpa/inet.h>
  49
  50 #include "sundries.h"
  51 #include "nfsmount.h"
  52
  53 #include <linux/nfs.h>
  54 #include "mount_constants.h"
  55 #include "nfs_mount4.h"
  56
  57 #include "nls.h"
  58
  59 #include "../defines.h"         /* for HAVE_inet_aton */
  60
  61 #ifndef NFS_PORT
  62 #define NFS_PORT 2049
  63 #endif
  64 #ifndef NFS_FHSIZE
  65 #define NFS_FHSIZE 32
  66 #endif
  67
  68 static char *nfs_strerror(int stat);
  69
  70 #define MAKE_VERSION(p,q,r)     (65536*(p) + 256*(q) + (r))
  71
  72 #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2)
  73
  74 static int
  75 linux_version_code(void) {
  76         struct utsname my_utsname;
  77         int p, q, r;
  78
  79         if (uname(&my_utsname) == 0) {
  80                 p = atoi(strtok(my_utsname.release, "."));
  81                 q = atoi(strtok(NULL, "."));
  82                 r = atoi(strtok(NULL, "."));
  83                 return MAKE_VERSION(p,q,r);
  84         }
  85         return 0;
  86 }
  87
  88 /*
  89  * nfs_mount_version according to the sources seen at compile time.
  90  */
  91 int nfs_mount_version = NFS_MOUNT_VERSION;
  92
  93 /*
  94  * Unfortunately, the kernel prints annoying console messages
  95  * in case of an unexpected nfs mount version (instead of
  96  * just returning some error).  Therefore we'll have to try
  97  * and figure out what version the kernel expects.
  98  *
  99  * Variables:
 100  *      NFS_MOUNT_VERSION: these nfsmount sources at compile time
 101  *      nfs_mount_version: version this source and running kernel can handle
 102  */
 103 static void
 104 find_kernel_nfs_mount_version(void) {
 105         static int kernel_version = 0;
 106
 107         if (kernel_version)
 108                 return;
 109
 110         kernel_version = linux_version_code();
 111
 112         if (kernel_version) {
 113              if (kernel_version < MAKE_VERSION(2,1,32))
 114                   nfs_mount_version = 1;
 115              else if (kernel_version < MAKE_VERSION(2,2,18))
 116                   nfs_mount_version = 3;
 117              else if (kernel_version < MAKE_VERSION(2,3,0))
 118                   nfs_mount_version = 4; /* since 2.2.18pre9 */
 119              else if (kernel_version < MAKE_VERSION(2,3,99))
 120                   nfs_mount_version = 3;
 121              else
 122                   nfs_mount_version = 4; /* since 2.3.99pre4 */
 123         }
 124         if (nfs_mount_version > NFS_MOUNT_VERSION)
 125              nfs_mount_version = NFS_MOUNT_VERSION;
 126 }
 127
 128 static struct pmap *
 129 get_mountport(struct sockaddr_in *server_addr,
 130       long unsigned prog,
 131       long unsigned version,
 132       long unsigned proto,
 133       long unsigned port)
 134 {
 135 struct pmaplist *pmap;
 136 static struct pmap p = {0, 0, 0, 0};
 137
 138 server_addr->sin_port = PMAPPORT;
 139 pmap = pmap_getmaps(server_addr);
 140
 141 if (version > MAX_NFSPROT)
 142         version = MAX_NFSPROT;
 143 if (!prog)
 144         prog = MOUNTPROG;
 145 p.pm_prog = prog;
 146 p.pm_vers = version;
 147 p.pm_prot = proto;
 148 p.pm_port = port;
 149
 150 while (pmap) {
 151         if (pmap->pml_map.pm_prog != prog)
 152                 goto next;
 153         if (!version && p.pm_vers > pmap->pml_map.pm_vers)
 154                 goto next;
 155         if (version > 2 && pmap->pml_map.pm_vers != version)
 156                 goto next;
 157         if (version && version <= 2 && pmap->pml_map.pm_vers > 2)
 158                 goto next;
 159         if (pmap->pml_map.pm_vers > MAX_NFSPROT ||
 160             (proto && p.pm_prot && pmap->pml_map.pm_prot != proto) ||
 161             (port && pmap->pml_map.pm_port != port))
 162                 goto next;
 163         memcpy(&p, &pmap->pml_map, sizeof(p));
 164 next:
 165         pmap = pmap->pml_next;
 166 }
 167 if (!p.pm_vers)
 168         p.pm_vers = MOUNTVERS;
 169 if (!p.pm_port)
 170         p.pm_port = MOUNTPORT;
 171 if (!p.pm_prot)
 172         p.pm_prot = IPPROTO_TCP;
 173 return &p;
 174 }
 175
 176 int nfsmount(const char *spec, const char *node, int *flags,
 177              char **extra_opts, char **mount_opts, int running_bg)
 178 {
 179         static char *prev_bg_host;
 180         char hostdir[1024];
 181         CLIENT *mclient;
 182         char *hostname;
 183         char *dirname;
 184         char *old_opts;
 185         char *mounthost=NULL;
 186         char new_opts[1024];
 187         struct timeval total_timeout;
 188         enum clnt_stat clnt_stat;
 189         static struct nfs_mount_data data;
 190         char *opt, *opteq;
 191         int val;
 192         struct hostent *hp;
 193         struct sockaddr_in server_addr;
 194         struct sockaddr_in mount_server_addr;
 195         struct pmap* pm_mnt;
 196         int msock, fsock;
 197         struct timeval retry_timeout;
 198         union {
 199                 struct fhstatus nfsv2;
 200                 struct mountres3 nfsv3;
 201         } status;
 202         struct stat statbuf;
 203         char *s;
 204         int port;
 205         int mountport;
 206         int proto;
 207         int bg;
 208         int soft;
 209         int intr;
 210         int posix;
 211         int nocto;
 212         int noac;
 213         int nolock;
 214         int broken_suid;
 215         int retry;
 216         int tcp;
 217         int mountprog;
 218         int mountvers;
 219         int nfsprog;
 220         int nfsvers;
 221         int retval;
 222         time_t t;
 223         time_t prevt;
 224         time_t timeout;
 225
 226         find_kernel_nfs_mount_version();
 227
 228         retval = EX_FAIL;
 229         msock = fsock = -1;
 230         mclient = NULL;
 231         if (strlen(spec) >= sizeof(hostdir)) {
 232                 fprintf(stderr, _("mount: "
 233                         "excessively long host:dir argument\n"));
 234                 goto fail;
 235         }
 236         strcpy(hostdir, spec);
 237         if ((s = strchr(hostdir, ':'))) {
 238                 hostname = hostdir;
 239                 dirname = s + 1;
 240                 *s = '\0';
 241                 /* Ignore all but first hostname in replicated mounts
 242                    until they can be fully supported. (mack@sgi.com) */
 243                 if ((s = strchr(hostdir, ','))) {
 244                         *s = '\0';
 245                         fprintf(stderr, _("mount: warning: "
 246                                 "multiple hostnames not supported\n"));
 247                 }
 248         } else {
 249                 fprintf(stderr, _("mount: "
 250                         "directory to mount not in host:dir format\n"));
 251                 goto fail;
 252         }
 253
 254         server_addr.sin_family = AF_INET;
 255 #ifdef HAVE_inet_aton
 256         if (!inet_aton(hostname, &server_addr.sin_addr))
 257 #endif
 258         {
 259                 if ((hp = gethostbyname(hostname)) == NULL) {
 260                         fprintf(stderr, _("mount: can't get address for %s\n"),
 261                                 hostname);
 262                         goto fail;
 263                 } else {
 264                         if (hp->h_length > sizeof(struct in_addr)) {
 265                                 fprintf(stderr,
 266                                         _("mount: got bad hp->h_length\n"));
 267                                 hp->h_length = sizeof(struct in_addr);
 268                         }
 269                         memcpy(&server_addr.sin_addr,
 270                                hp->h_addr, hp->h_length);
 271                 }
 272         }
 273
 274         memcpy (&mount_server_addr, &server_addr, sizeof (mount_server_addr));
 275
 276         /* add IP address to mtab options for use when unmounting */
 277
 278         s = inet_ntoa(server_addr.sin_addr);
 279         old_opts = *extra_opts;
 280         if (!old_opts)
 281                 old_opts = "";
 282         if (strlen(old_opts) + strlen(s) + 10 >= sizeof(new_opts)) {
 283                 fprintf(stderr, _("mount: "
 284                         "excessively long option argument\n"));
 285                 goto fail;
 286         }
 287         sprintf(new_opts, "%s%saddr=%s",
 288                 old_opts, *old_opts ? "," : "", s);
 289         *extra_opts = xstrdup(new_opts);
 290
 291         /* Set default options.
 292          * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
 293          * let the kernel decide.
 294          * timeo is filled in after we know whether it'll be TCP or UDP. */
 295         memset(&data, 0, sizeof(data));
 296         data.retrans    = 3;
 297         data.acregmin   = 3;
 298         data.acregmax   = 60;
 299         data.acdirmin   = 30;
 300         data.acdirmax   = 60;
 301 #if NFS_MOUNT_VERSION >= 2
 302         data.namlen     = NAME_MAX;
 303 #endif
 304
 305         bg = 0;
 306         soft = 0;
 307         intr = 0;
 308         posix = 0;
 309         nocto = 0;
 310         nolock = 0;
 311         broken_suid = 0;
 312         noac = 0;
 313         retry = 10000;          /* 10000 minutes ~ 1 week */
 314         tcp = 0;
 315
 316         mountprog = MOUNTPROG;
 317         mountvers = 0;
 318         port = 0;
 319         mountport = 0;
 320         nfsprog = NFS_PROGRAM;
 321         nfsvers = 0;
 322
 323         /* parse options */
 324
 325         for (opt = strtok(old_opts, ","); opt; opt = strtok(NULL, ",")) {
 326                 if ((opteq = strchr(opt, '='))) {
 327                         val = atoi(opteq + 1);
 328                         *opteq = '\0';
 329                         if (!strcmp(opt, "rsize"))
 330                                 data.rsize = val;
 331                         else if (!strcmp(opt, "wsize"))
 332                                 data.wsize = val;
 333                         else if (!strcmp(opt, "timeo"))
 334                                 data.timeo = val;
 335                         else if (!strcmp(opt, "retrans"))
 336                                 data.retrans = val;
 337                         else if (!strcmp(opt, "acregmin"))
 338                                 data.acregmin = val;
 339                         else if (!strcmp(opt, "acregmax"))
 340                                 data.acregmax = val;
 341                         else if (!strcmp(opt, "acdirmin"))
 342                                 data.acdirmin = val;
 343                         else if (!strcmp(opt, "acdirmax"))
 344                                 data.acdirmax = val;
 345                         else if (!strcmp(opt, "actimeo")) {
 346                                 data.acregmin = val;
 347                                 data.acregmax = val;
 348                                 data.acdirmin = val;
 349                                 data.acdirmax = val;
 350                         }
 351                         else if (!strcmp(opt, "retry"))
 352                                 retry = val;
 353                         else if (!strcmp(opt, "port"))
 354                                 port = val;
 355                         else if (!strcmp(opt, "mountport"))
 356                                 mountport = val;
 357                         else if (!strcmp(opt, "mounthost"))
 358                                 mounthost=xstrndup(opteq+1,
 359                                                   strcspn(opteq+1," \t\n\r,"));
 360                         else if (!strcmp(opt, "mountprog"))
 361                                 mountprog = val;
 362                         else if (!strcmp(opt, "mountvers"))
 363                                 mountvers = val;
 364                         else if (!strcmp(opt, "nfsprog"))
 365                                 nfsprog = val;
 366                         else if (!strcmp(opt, "nfsvers") ||
 367                                  !strcmp(opt, "vers"))
 368                                 nfsvers = val;
 369                         else if (!strcmp(opt, "proto")) {
 370                                 if (!strncmp(opteq+1, "tcp", 3))
 371                                         tcp = 1;
 372                                 else if (!strncmp(opteq+1, "udp", 3))
 373                                         tcp = 0;
 374                                 else
 375                                         printf(_("Warning: Unrecognized proto= option.\n"));
 376                         } else if (!strcmp(opt, "namlen")) {
 377 #if NFS_MOUNT_VERSION >= 2
 378                                 if (nfs_mount_version >= 2)
 379                                         data.namlen = val;
 380                                 else
 381 #endif
 382                                 printf(_("Warning: Option namlen is not supported.\n"));
 383                         } else if (!strcmp(opt, "addr"))
 384                                 /* ignore */;
 385                         else {
 386                                 printf(_("unknown nfs mount parameter: "
 387                                        "%s=%d\n"), opt, val);
 388                                 goto fail;
 389                         }
 390                 }
 391                 else {
 392                         val = 1;
 393                         if (!strncmp(opt, "no", 2)) {
 394                                 val = 0;
 395                                 opt += 2;
 396                         }
 397                         if (!strcmp(opt, "bg"))
 398                                 bg = val;
 399                         else if (!strcmp(opt, "fg"))
 400                                 bg = !val;
 401                         else if (!strcmp(opt, "soft"))
 402                                 soft = val;
 403                         else if (!strcmp(opt, "hard"))
 404                                 soft = !val;
 405                         else if (!strcmp(opt, "intr"))
 406                                 intr = val;
 407                         else if (!strcmp(opt, "posix"))
 408                                 posix = val;
 409                         else if (!strcmp(opt, "cto"))
 410                                 nocto = !val;
 411                         else if (!strcmp(opt, "ac"))
 412                                 noac = !val;
 413                         else if (!strcmp(opt, "tcp"))
 414                                 tcp = val;
 415                         else if (!strcmp(opt, "udp"))
 416                                 tcp = !val;
 417                         else if (!strcmp(opt, "lock")) {
 418                                 if (nfs_mount_version >= 3)
 419                                         nolock = !val;
 420                                 else
 421                                         printf(_("Warning: option nolock is not supported.\n"));
 422                         } else if (!strcmp(opt, "broken_suid")) {
 423                                 broken_suid = val;
 424                         } else {
 425                                 if (!sloppy) {
 426                                         printf(_("unknown nfs mount option: "
 427                                                "%s%s\n"), val ? "" : "no", opt);
 428                                         goto fail;
 429                                 }
 430                         }
 431                 }
 432         }
 433         proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP;
 434
 435         data.flags = (soft ? NFS_MOUNT_SOFT : 0)
 436                 | (intr ? NFS_MOUNT_INTR : 0)
 437                 | (posix ? NFS_MOUNT_POSIX : 0)
 438                 | (nocto ? NFS_MOUNT_NOCTO : 0)
 439                 | (noac ? NFS_MOUNT_NOAC : 0);
 440 #if NFS_MOUNT_VERSION >= 2
 441         if (nfs_mount_version >= 2)
 442                 data.flags |= (tcp ? NFS_MOUNT_TCP : 0);
 443 #endif
 444 #if NFS_MOUNT_VERSION >= 3
 445         if (nfs_mount_version >= 3)
 446                 data.flags |= (nolock ? NFS_MOUNT_NONLM : 0);
 447 #endif
 448 #if NFS_MOUNT_VERSION >= 4
 449         if (nfs_mount_version >= 4)
 450                 data.flags |= (broken_suid ? NFS_MOUNT_BROKEN_SUID : 0);
 451 #endif
 452         if (nfsvers > MAX_NFSPROT) {
 453                 fprintf(stderr, "NFSv%d not supported!\n", nfsvers);
 454                 return 0;
 455         }
 456         if (mountvers > MAX_NFSPROT) {
 457                 fprintf(stderr, "NFSv%d not supported!\n", nfsvers);
 458                 return 0;
 459         }
 460         if (nfsvers && !mountvers)
 461                 mountvers = (nfsvers < 3) ? 1 : nfsvers;
 462         if (nfsvers && nfsvers < mountvers) {
 463                 mountvers = nfsvers;
 464         }
 465
 466         /* Adjust options if none specified */
 467         if (!data.timeo)
 468                 data.timeo = tcp ? 70 : 7;
 469
 470 #ifdef NFS_MOUNT_DEBUG
 471         printf("rsize = %d, wsize = %d, timeo = %d, retrans = %d\n",
 472                 data.rsize, data.wsize, data.timeo, data.retrans);
 473         printf("acreg (min, max) = (%d, %d), acdir (min, max) = (%d, %d)\n",
 474                 data.acregmin, data.acregmax, data.acdirmin, data.acdirmax);
 475         printf("port = %d, bg = %d, retry = %d, flags = %.8x\n",
 476                 port, bg, retry, data.flags);
 477         printf("mountprog = %d, mountvers = %d, nfsprog = %d, nfsvers = %d\n",
 478                 mountprog, mountvers, nfsprog, nfsvers);
 479         printf("soft = %d, intr = %d, posix = %d, nocto = %d, noac = %d\n",
 480                 (data.flags & NFS_MOUNT_SOFT) != 0,
 481                 (data.flags & NFS_MOUNT_INTR) != 0,
 482                 (data.flags & NFS_MOUNT_POSIX) != 0,
 483                 (data.flags & NFS_MOUNT_NOCTO) != 0,
 484                 (data.flags & NFS_MOUNT_NOAC) != 0);
 485 #if NFS_MOUNT_VERSION >= 2
 486         printf("tcp = %d\n",
 487                 (data.flags & NFS_MOUNT_TCP) != 0);
 488 #endif
 489 #endif
 490
 491         data.version = nfs_mount_version;
 492         *mount_opts = (char *) &data;
 493
 494         if (*flags & MS_REMOUNT)
 495                 return 0;
 496
 497         /*
 498          * If the previous mount operation on the same host was
 499          * backgrounded, and the "bg" for this mount is also set,
 500          * give up immediately, to avoid the initial timeout.
 501          */
 502         if (bg && !running_bg &&
 503             prev_bg_host && strcmp(hostname, prev_bg_host) == 0) {
 504                 if (retry > 0)
 505                         retval = EX_BG;
 506                 return retval;
 507         }
 508
 509         /* create mount deamon client */
 510         /* See if the nfs host = mount host. */
 511         if (mounthost) {
 512           if (mounthost[0] >= '0' && mounthost[0] <= '9') {
 513             mount_server_addr.sin_family = AF_INET;
 514             mount_server_addr.sin_addr.s_addr = inet_addr(hostname);
 515           } else {
 516                   if ((hp = gethostbyname(mounthost)) == NULL) {
 517                           fprintf(stderr, _("mount: can't get address for %s\n"),
 518                                   hostname);
 519                           goto fail;
 520                   } else {
 521                           if (hp->h_length > sizeof(struct in_addr)) {
 522                                   fprintf(stderr,
 523                                           _("mount: got bad hp->h_length?\n"));
 524                                   hp->h_length = sizeof(struct in_addr);
 525                           }
 526                           mount_server_addr.sin_family = AF_INET;
 527                           memcpy(&mount_server_addr.sin_addr,
 528                                  hp->h_addr, hp->h_length);
 529                   }
 530           }
 531         }
 532
 533         /*
 534          * The following loop implements the mount retries. On the first
 535          * call, "running_bg" is 0. When the mount times out, and the
 536          * "bg" option is set, the exit status EX_BG will be returned.
 537          * For a backgrounded mount, there will be a second call by the
 538          * child process with "running_bg" set to 1.
 539          *
 540          * The case where the mount point is not present and the "bg"
 541          * option is set, is treated as a timeout. This is done to
 542          * support nested mounts.
 543          *
 544          * The "retry" count specified by the user is the number of
 545          * minutes to retry before giving up.
 546          *
 547          * Only the first error message will be displayed.
 548          */
 549         retry_timeout.tv_sec = 3;
 550         retry_timeout.tv_usec = 0;
 551         total_timeout.tv_sec = 20;
 552         total_timeout.tv_usec = 0;
 553         timeout = time(NULL) + 60 * retry;
 554         prevt = 0;
 555         t = 30;
 556         val = 1;
 557         for (;;) {
 558                 if (bg && stat(node, &statbuf) == -1) {
 559                         if (running_bg) {
 560                                 sleep(val);     /* 1, 2, 4, 8, 16, 30, ... */
 561                                 val *= 2;
 562                                 if (val > 30)
 563                                         val = 30;
 564                         }
 565                 } else {
 566                         /* be careful not to use too many CPU cycles */
 567                         if (t - prevt < 30)
 568                                 sleep(30);
 569
 570                         pm_mnt = get_mountport(&mount_server_addr,
 571                                        mountprog,
 572                                        mountvers,
 573                                        proto,
 574                                        mountport);
 575
 576                         /* contact the mount daemon via TCP */
 577                         mount_server_addr.sin_port = htons(pm_mnt->pm_port);
 578                         msock = RPC_ANYSOCK;
 579
 580                         switch (pm_mnt->pm_prot) {
 581                         case IPPROTO_UDP:
 582                                 mclient = clntudp_create(&mount_server_addr,
 583                                                  pm_mnt->pm_prog,
 584                                                  pm_mnt->pm_vers,
 585                                                  retry_timeout,
 586                                                  &msock);
 587                   if (mclient)
 588                           break;
 589                   mount_server_addr.sin_port = htons(pm_mnt->pm_port);
 590                   msock = RPC_ANYSOCK;
 591                 case IPPROTO_TCP:
 592                         mclient = clnttcp_create(&mount_server_addr,
 593                                                  pm_mnt->pm_prog,
 594                                                  pm_mnt->pm_vers,
 595                                                  &msock, 0, 0);
 596                         break;
 597                 default:
 598                         mclient = 0;
 599                         }
 600                         if (mclient) {
 601                                 /* try to mount hostname:dirname */
 602                                 mclient->cl_auth = authunix_create_default();
 603
 604                         /* make pointers in xdr_mountres3 NULL so
 605                          * that xdr_array allocates memory for us
 606                          */
 607                         memset(&status, 0, sizeof(status));
 608
 609                         if (pm_mnt->pm_vers == 3)
 610                                 clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT,
 611                                                       (xdrproc_t) xdr_dirpath,
 612                                                       (caddr_t) &dirname,
 613                                                       (xdrproc_t) xdr_mountres3,
 614                                                       (caddr_t) &status,
 615                                         total_timeout);
 616                         else
 617                                 clnt_stat = clnt_call(mclient, MOUNTPROC_MNT,
 618                                                       (xdrproc_t) xdr_dirpath,
 619                                                       (caddr_t) &dirname,
 620                                                       (xdrproc_t) xdr_fhstatus,
 621                                                       (caddr_t) &status,
 622                                                       total_timeout);
 623
 624                                 if (clnt_stat == RPC_SUCCESS)
 625                                         break;          /* we're done */
 626                                 if (errno != ECONNREFUSED) {
 627                                         clnt_perror(mclient, "mount");
 628                                         goto fail;      /* don't retry */
 629                                 }
 630                                 if (!running_bg && prevt == 0)
 631                                         clnt_perror(mclient, "mount");
 632                                 auth_destroy(mclient->cl_auth);
 633                                 clnt_destroy(mclient);
 634                                 mclient = 0;
 635                                 close(msock);
 636                         } else {
 637                                 if (!running_bg && prevt == 0)
 638                                         clnt_pcreateerror("mount");
 639                         }
 640                         prevt = t;
 641                 }
 642                 if (!bg)
 643                         goto fail;
 644                 if (!running_bg) {
 645                         prev_bg_host = xstrdup(hostname);
 646                         if (retry > 0)
 647                                 retval = EX_BG;
 648                         goto fail;
 649                 }
 650                 t = time(NULL);
 651                 if (t >= timeout)
 652                         goto fail;
 653         }
 654         nfsvers = (pm_mnt->pm_vers < 2) ? 2 : pm_mnt->pm_vers;
 655
 656         if (nfsvers == 2) {
 657                 if (status.nfsv2.fhs_status != 0) {
 658                         fprintf(stderr,
 659                                 "mount: %s:%s failed, reason given by server: %s\n",
 660                                 hostname, dirname,
 661                                 nfs_strerror(status.nfsv2.fhs_status));
 662                         goto fail;
 663                 }
 664                 memcpy(data.root.data,
 665                        (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
 666                        NFS_FHSIZE);
 667 #if NFS_MOUNT_VERSION >= 4
 668                 data.root.size = NFS_FHSIZE;
 669                 memcpy(data.old_root.data,
 670                        (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
 671                        NFS_FHSIZE);
 672 #endif
 673         } else {
 674 #if NFS_MOUNT_VERSION >= 4
 675                 fhandle3 *fhandle;
 676                 if (status.nfsv3.fhs_status != 0) {
 677                         fprintf(stderr,
 678                                 "mount: %s:%s failed, reason given by server: %s\n",
 679                                 hostname, dirname,
 680                                 nfs_strerror(status.nfsv3.fhs_status));
 681                         goto fail;
 682                 }
 683                 fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle;
 684                 memset(data.old_root.data, 0, NFS_FHSIZE);
 685                 memset(&data.root, 0, sizeof(data.root));
 686                 data.root.size = fhandle->fhandle3_len;
 687                 memcpy(data.root.data,
 688                        (char *) fhandle->fhandle3_val,
 689                        fhandle->fhandle3_len);
 690
 691                 data.flags |= NFS_MOUNT_VER3;
 692 #endif
 693         }
 694
 695         /* create nfs socket for kernel */
 696
 697         if (tcp) {
 698                 if (nfs_mount_version < 3) {
 699                         printf(_("NFS over TCP is not supported.\n"));
 700                         goto fail;
 701                 }
 702                 fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 703         } else
 704                 fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 705         if (fsock < 0) {
 706                 perror(_("nfs socket"));
 707                 goto fail;
 708         }
 709         if (bindresvport(fsock, 0) < 0) {
 710                 perror(_("nfs bindresvport"));
 711                 goto fail;
 712         }
 713         if (port == 0) {
 714                 server_addr.sin_port = PMAPPORT;
 715                 port = pmap_getport(&server_addr, nfsprog, nfsvers,
 716                         tcp ? IPPROTO_TCP : IPPROTO_UDP);
 717                 if (port == 0)
 718                         port = NFS_PORT;
 719 #ifdef NFS_MOUNT_DEBUG
 720                 else
 721                         printf(_("used portmapper to find NFS port\n"));
 722 #endif
 723         }
 724 #ifdef NFS_MOUNT_DEBUG
 725         printf(_("using port %d for nfs deamon\n"), port);
 726 #endif
 727         server_addr.sin_port = htons(port);
 728          /*
 729           * connect() the socket for kernels 1.3.10 and below only,
 730           * to avoid problems with multihomed hosts.
 731           * --Swen
 732           */
 733         if (linux_version_code() <= 66314
 734             && connect(fsock, (struct sockaddr *) &server_addr,
 735                        sizeof (server_addr)) < 0) {
 736                 perror(_("nfs connect"));
 737                 goto fail;
 738         }
 739
 740         /* prepare data structure for kernel */
 741
 742         data.fd = fsock;
 743         memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr));
 744         strncpy(data.hostname, hostname, sizeof(data.hostname));
 745
 746         /* clean up */
 747
 748         auth_destroy(mclient->cl_auth);
 749         clnt_destroy(mclient);
 750         close(msock);
 751         return 0;
 752
 753         /* abort */
 754
 755 fail:
 756         if (msock != -1) {
 757                 if (mclient) {
 758                         auth_destroy(mclient->cl_auth);
 759                         clnt_destroy(mclient);
 760                 }
 761                 close(msock);
 762         }
 763         if (fsock != -1)
 764                 close(fsock);
 765         return retval;
 766 }
 767
 768 /*
 769  * We need to translate between nfs status return values and
 770  * the local errno values which may not be the same.
 771  *
 772  * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno:
 773  * "after #include <errno.h> the symbol errno is reserved for any use,
 774  *  it cannot even be used as a struct tag or field name".
 775  */
 776
 777 #ifndef EDQUOT
 778 #define EDQUOT  ENOSPC
 779 #endif
 780
 781 static struct {
 782         enum nfs_stat stat;
 783         int errnum;
 784 } nfs_errtbl[] = {
 785         { NFS_OK,               0               },
 786         { NFSERR_PERM,          EPERM           },
 787         { NFSERR_NOENT,         ENOENT          },
 788         { NFSERR_IO,            EIO             },
 789         { NFSERR_NXIO,          ENXIO           },
 790         { NFSERR_ACCES,         EACCES          },
 791         { NFSERR_EXIST,         EEXIST          },
 792         { NFSERR_NODEV,         ENODEV          },
 793         { NFSERR_NOTDIR,        ENOTDIR         },
 794         { NFSERR_ISDIR,         EISDIR          },
 795 #ifdef NFSERR_INVAL
 796         { NFSERR_INVAL,         EINVAL          },      /* that Sun forgot */
 797 #endif
 798         { NFSERR_FBIG,          EFBIG           },
 799         { NFSERR_NOSPC,         ENOSPC          },
 800         { NFSERR_ROFS,          EROFS           },
 801         { NFSERR_NAMETOOLONG,   ENAMETOOLONG    },
 802         { NFSERR_NOTEMPTY,      ENOTEMPTY       },
 803         { NFSERR_DQUOT,         EDQUOT          },
 804         { NFSERR_STALE,         ESTALE          },
 805 #ifdef EWFLUSH
 806         { NFSERR_WFLUSH,        EWFLUSH         },
 807 #endif
 808         /* Throw in some NFSv3 values for even more fun (HP returns these) */
 809         { 71,                   EREMOTE         },
 810
 811         { -1,                   EIO             }
 812 };
 813
 814 static char *nfs_strerror(int stat)
 815 {
 816         int i;
 817         static char buf[256];
 818
 819         for (i = 0; nfs_errtbl[i].stat != -1; i++) {
 820                 if (nfs_errtbl[i].stat == stat)
 821                         return strerror(nfs_errtbl[i].errnum);
 822         }
 823         sprintf(buf, _("unknown nfs status return value: %d"), stat);
 824         return buf;
 825 }
 826
 827 #if 0
 828 int
 829 my_getport(struct in_addr server, struct timeval *timeo, ...)
 830 {
 831         struct sockaddr_in sin;
 832         struct pmap     pmap;
 833         CLIENT          *clnt;
 834         int             sock = RPC_ANYSOCK, port;
 835
 836         pmap.pm_prog = prog;
 837         pmap.pm_vers = vers;
 838         pmap.pm_prot = prot;
 839         pmap.pm_port = 0;
 840         sin.sin_family = AF_INET;
 841         sin.sin_addr = server;
 842         sin.sin_port = htons(111);
 843         clnt = clntudp_create(&sin, 100000, 2, *timeo, &sock);
 844         status = clnt_call(clnt, PMAP_GETPORT,
 845                                 &pmap, (xdrproc_t) xdr_pmap,
 846                                 &port, (xdrproc_t) xdr_uint);
 847         if (status != SUCCESS) {
 848              /* natter */
 849                 port = 0;
 850         }
 851
 852         clnt_destroy(clnt);
 853         close(sock);
 854         return port;
 855 }
 856 #endif