utils/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 Miskiewicz <misiek@pld.ORG.PL>
  25  * - added Native Language Support
  26  *
  27  * Modified by Olaf Kirch and Trond Myklebust for new NFS code,
  28  * plus NFSv3 stuff.
  29  *
  30  * 2006-06-06 Amit Gud <agud@redhat.com>
  31  * - Moved with modifcations to nfs-utils/utils/mount from util-linux/mount.
  32  */
  33
  34 /*
  35  * nfsmount.c,v 1.1.1.1 1993/11/18 08:40:51 jrs Exp
  36  */
  37
  38 #ifdef HAVE_CONFIG_H
  39 #include <config.h>
  40 #endif
  41
  42 #include <ctype.h>
  43 #include <unistd.h>
  44 #include <stdio.h>
  45 #include <string.h>
  46 #include <stdlib.h>
  47 #include <errno.h>
  48 #include <netdb.h>
  49 #include <time.h>
  50 #include <rpc/rpc.h>
  51 #include <rpc/pmap_prot.h>
  52 #include <rpc/pmap_clnt.h>
  53 #include <sys/socket.h>
  54 #include <sys/time.h>
  55 #include <sys/stat.h>
  56 #include <netinet/in.h>
  57 #include <arpa/inet.h>
  58 #include <mntent.h>
  59 #include <sys/mount.h>
  60 #include <paths.h>
  61 #include <syslog.h>
  62
  63 #include "xcommon.h"
  64 #include "mount.h"
  65 #include "nfs_mount.h"
  66 #include "mount_constants.h"
  67 #include "nls.h"
  68 #include "error.h"
  69 #include "network.h"
  70 #include "version.h"
  71
  72 #ifdef HAVE_RPCSVC_NFS_PROT_H
  73 #include <rpcsvc/nfs_prot.h>
  74 #else
  75 #include <linux/nfs.h>
  76 #define nfsstat nfs_stat
  77 #endif
  78
  79 #ifndef NFS_PORT
  80 #define NFS_PORT 2049
  81 #endif
  82 #ifndef NFS_FHSIZE
  83 #define NFS_FHSIZE 32
  84 #endif
  85
  86 #ifndef HAVE_INET_ATON
  87 #define inet_aton(a,b) (0)
  88 #endif
  89
  90 typedef dirpath mnt2arg_t;
  91 typedef dirpath mnt3arg_t;
  92 typedef dirpath mntarg_t;
  93
  94 typedef struct fhstatus  mnt2res_t;
  95 typedef struct mountres3 mnt3res_t;
  96 typedef union {
  97         mnt2res_t nfsv2;
  98         mnt3res_t nfsv3;
  99 } mntres_t;
 100
 101 extern int nfs_mount_data_version;
 102 extern char *progname;
 103 extern int verbose;
 104 extern int sloppy;
 105
 106 static inline enum clnt_stat
 107 nfs3_mount(CLIENT *clnt, mnt3arg_t *mnt3arg, mnt3res_t *mnt3res)
 108 {
 109         return clnt_call(clnt, MOUNTPROC3_MNT,
 110                          (xdrproc_t) xdr_dirpath, (caddr_t) mnt3arg,
 111                          (xdrproc_t) xdr_mountres3, (caddr_t) mnt3res,
 112                          TIMEOUT);
 113 }
 114
 115 static inline enum clnt_stat
 116 nfs2_mount(CLIENT *clnt, mnt2arg_t *mnt2arg, mnt2res_t *mnt2res)
 117 {
 118         return clnt_call(clnt, MOUNTPROC_MNT,
 119                          (xdrproc_t) xdr_dirpath, (caddr_t) mnt2arg,
 120                          (xdrproc_t) xdr_fhstatus, (caddr_t) mnt2res,
 121                          TIMEOUT);
 122 }
 123
 124 static int
 125 nfs_call_mount(clnt_addr_t *mnt_server, clnt_addr_t *nfs_server,
 126                mntarg_t *mntarg, mntres_t *mntres)
 127 {
 128         CLIENT *clnt;
 129         enum clnt_stat stat;
 130         int msock;
 131
 132         if (!probe_bothports(mnt_server, nfs_server))
 133                 goto out_bad;
 134
 135         clnt = mnt_openclnt(mnt_server, &msock);
 136         if (!clnt)
 137                 goto out_bad;
 138         /* make pointers in xdr_mountres3 NULL so
 139          * that xdr_array allocates memory for us
 140          */
 141         memset(mntres, 0, sizeof(*mntres));
 142         switch (mnt_server->pmap.pm_vers) {
 143         case 3:
 144                 stat = nfs3_mount(clnt, mntarg, &mntres->nfsv3);
 145                 break;
 146         case 2:
 147         case 1:
 148                 stat = nfs2_mount(clnt, mntarg, &mntres->nfsv2);
 149                 break;
 150         default:
 151                 goto out_bad;
 152         }
 153         if (stat != RPC_SUCCESS) {
 154                 clnt_geterr(clnt, &rpc_createerr.cf_error);
 155                 rpc_createerr.cf_stat = stat;
 156         }
 157         mnt_closeclnt(clnt, msock);
 158         if (stat == RPC_SUCCESS)
 159                 return 1;
 160  out_bad:
 161         return 0;
 162 }
 163
 164 static int
 165 parse_options(char *old_opts, struct nfs_mount_data *data,
 166               int *bg, int *retry, clnt_addr_t *mnt_server,
 167               clnt_addr_t *nfs_server, char *new_opts, const int opt_size)
 168 {
 169         struct sockaddr_in *mnt_saddr = &mnt_server->saddr;
 170         struct pmap *mnt_pmap = &mnt_server->pmap;
 171         struct pmap *nfs_pmap = &nfs_server->pmap;
 172         int len;
 173         char *opt, *opteq, *p, *opt_b, *tmp_opts;
 174         char *mounthost = NULL;
 175         char cbuf[128];
 176         int open_quote = 0;
 177
 178         data->flags = 0;
 179         *bg = 0;
 180
 181         len = strlen(new_opts);
 182         tmp_opts = xstrdup(old_opts);
 183         for (p=tmp_opts, opt_b=NULL; p && *p; p++) {
 184                 if (!opt_b)
 185                         opt_b = p;              /* begin of the option item */
 186                 if (*p == '"')
 187                         open_quote ^= 1;        /* reverse the status */
 188                 if (open_quote)
 189                         continue;               /* still in a quoted block */
 190                 if (*p == ',')
 191                         *p = '\0';              /* terminate the option item */
 192                 if (*p == '\0' || *(p+1) == '\0') {
 193                         opt = opt_b;            /* opt is useful now */
 194                         opt_b = NULL;
 195                 }
 196                 else
 197                         continue;               /* still somewhere in the option item */
 198
 199                 if (strlen(opt) >= sizeof(cbuf))
 200                         goto bad_parameter;
 201                 if ((opteq = strchr(opt, '=')) && isdigit(opteq[1])) {
 202                         int val = atoi(opteq + 1);
 203                         *opteq = '\0';
 204                         if (!strcmp(opt, "rsize"))
 205                                 data->rsize = val;
 206                         else if (!strcmp(opt, "wsize"))
 207                                 data->wsize = val;
 208                         else if (!strcmp(opt, "timeo"))
 209                                 data->timeo = val;
 210                         else if (!strcmp(opt, "retrans"))
 211                                 data->retrans = val;
 212                         else if (!strcmp(opt, "acregmin"))
 213                                 data->acregmin = val;
 214                         else if (!strcmp(opt, "acregmax"))
 215                                 data->acregmax = val;
 216                         else if (!strcmp(opt, "acdirmin"))
 217                                 data->acdirmin = val;
 218                         else if (!strcmp(opt, "acdirmax"))
 219                                 data->acdirmax = val;
 220                         else if (!strcmp(opt, "actimeo")) {
 221                                 data->acregmin = val;
 222                                 data->acregmax = val;
 223                                 data->acdirmin = val;
 224                                 data->acdirmax = val;
 225                         }
 226                         else if (!strcmp(opt, "retry"))
 227                                 *retry = val;
 228                         else if (!strcmp(opt, "port"))
 229                                 nfs_pmap->pm_port = val;
 230                         else if (!strcmp(opt, "mountport"))
 231                                 mnt_pmap->pm_port = val;
 232                         else if (!strcmp(opt, "mountprog"))
 233                                 mnt_pmap->pm_prog = val;
 234                         else if (!strcmp(opt, "mountvers"))
 235                                 mnt_pmap->pm_vers = val;
 236                         else if (!strcmp(opt, "mounthost"))
 237                                 mounthost=xstrndup(opteq+1, strcspn(opteq+1," \t\n\r,"));
 238                         else if (!strcmp(opt, "nfsprog"))
 239                                 nfs_pmap->pm_prog = val;
 240                         else if (!strcmp(opt, "nfsvers") ||
 241                                  !strcmp(opt, "vers")) {
 242                                 nfs_pmap->pm_vers = val;
 243                                 opt = "nfsvers";
 244 #if NFS_MOUNT_VERSION >= 2
 245                         } else if (!strcmp(opt, "namlen")) {
 246                                 if (nfs_mount_data_version >= 2)
 247                                         data->namlen = val;
 248                                 else if (sloppy)
 249                                         continue;
 250                                 else
 251                                         goto bad_parameter;
 252 #endif
 253                         } else if (!strcmp(opt, "addr")) {
 254                                 /* ignore */;
 255                                 continue;
 256                         } else if (sloppy)
 257                                 continue;
 258                         else
 259                                 goto bad_parameter;
 260                         sprintf(cbuf, "%s=%s,", opt, opteq+1);
 261                 } else if (opteq) {
 262                         *opteq = '\0';
 263                         if (!strcmp(opt, "proto")) {
 264                                 if (!strcmp(opteq+1, "udp")) {
 265                                         nfs_pmap->pm_prot = IPPROTO_UDP;
 266                                         mnt_pmap->pm_prot = IPPROTO_UDP;
 267 #if NFS_MOUNT_VERSION >= 2
 268                                         data->flags &= ~NFS_MOUNT_TCP;
 269                                 } else if (!strcmp(opteq+1, "tcp") &&
 270                                            nfs_mount_data_version > 2) {
 271                                         nfs_pmap->pm_prot = IPPROTO_TCP;
 272                                         mnt_pmap->pm_prot = IPPROTO_TCP;
 273                                         data->flags |= NFS_MOUNT_TCP;
 274 #endif
 275                                 } else if (sloppy)
 276                                         continue;
 277                                 else
 278                                         goto bad_parameter;
 279 #if NFS_MOUNT_VERSION >= 5
 280                         } else if (!strcmp(opt, "sec")) {
 281                                 char *secflavor = opteq+1;
 282                                 /* see RFC 2623 */
 283                                 if (nfs_mount_data_version < 5) {
 284                                         printf(_("Warning: ignoring sec=%s option\n"),
 285                                                         secflavor);
 286                                         continue;
 287                                 } else if (!strcmp(secflavor, "none"))
 288                                         data->pseudoflavor = AUTH_NONE;
 289                                 else if (!strcmp(secflavor, "sys"))
 290                                         data->pseudoflavor = AUTH_SYS;
 291                                 else if (!strcmp(secflavor, "krb5"))
 292                                         data->pseudoflavor = AUTH_GSS_KRB5;
 293                                 else if (!strcmp(secflavor, "krb5i"))
 294                                         data->pseudoflavor = AUTH_GSS_KRB5I;
 295                                 else if (!strcmp(secflavor, "krb5p"))
 296                                         data->pseudoflavor = AUTH_GSS_KRB5P;
 297                                 else if (!strcmp(secflavor, "lipkey"))
 298                                         data->pseudoflavor = AUTH_GSS_LKEY;
 299                                 else if (!strcmp(secflavor, "lipkey-i"))
 300                                         data->pseudoflavor = AUTH_GSS_LKEYI;
 301                                 else if (!strcmp(secflavor, "lipkey-p"))
 302                                         data->pseudoflavor = AUTH_GSS_LKEYP;
 303                                 else if (sloppy)
 304                                         continue;
 305                                 else {
 306                                         printf(_("Warning: Unrecognized security flavor %s.\n"),
 307                                                 secflavor);
 308                                         goto bad_parameter;
 309                                 }
 310                                 data->flags |= NFS_MOUNT_SECFLAVOUR;
 311 #endif
 312                         } else if (!strcmp(opt, "mounthost"))
 313                                 mounthost=xstrndup(opteq+1,
 314                                                    strcspn(opteq+1," \t\n\r,"));
 315                          else if (!strcmp(opt, "context")) {
 316                                 char *context = opteq + 1;
 317                                 int ctxlen = strlen(context);
 318
 319                                 if (ctxlen > NFS_MAX_CONTEXT_LEN) {
 320                                         nfs_error(_("context parameter exceeds"
 321                                                         " limit of %d"),
 322                                                         NFS_MAX_CONTEXT_LEN);
 323                                         goto bad_parameter;
 324                                 }
 325                                 /* The context string is in the format of
 326                                  * "system_u:object_r:...".  We only want
 327                                  * the context str between the quotes.
 328                                  */
 329                                 if (*context == '"')
 330                                         strncpy(data->context, context+1,
 331                                                         ctxlen-2);
 332                                 else
 333                                         strncpy(data->context, context,
 334                                                         NFS_MAX_CONTEXT_LEN);
 335                         } else if (sloppy)
 336                                 continue;
 337                         else
 338                                 goto bad_parameter;
 339                         sprintf(cbuf, "%s=%s,", opt, opteq+1);
 340                 } else {
 341                         int val = 1;
 342                         if (!strncmp(opt, "no", 2)) {
 343                                 val = 0;
 344                                 opt += 2;
 345                         }
 346                         if (!strcmp(opt, "bg"))
 347                                 *bg = val;
 348                         else if (!strcmp(opt, "fg"))
 349                                 *bg = !val;
 350                         else if (!strcmp(opt, "soft")) {
 351                                 data->flags &= ~NFS_MOUNT_SOFT;
 352                                 if (val)
 353                                         data->flags |= NFS_MOUNT_SOFT;
 354                         } else if (!strcmp(opt, "hard")) {
 355                                 data->flags &= ~NFS_MOUNT_SOFT;
 356                                 if (!val)
 357                                         data->flags |= NFS_MOUNT_SOFT;
 358                         } else if (!strcmp(opt, "intr")) {
 359                                 data->flags &= ~NFS_MOUNT_INTR;
 360                                 if (val)
 361                                         data->flags |= NFS_MOUNT_INTR;
 362                         } else if (!strcmp(opt, "posix")) {
 363                                 data->flags &= ~NFS_MOUNT_POSIX;
 364                                 if (val)
 365                                         data->flags |= NFS_MOUNT_POSIX;
 366                         } else if (!strcmp(opt, "cto")) {
 367                                 data->flags &= ~NFS_MOUNT_NOCTO;
 368                                 if (!val)
 369                                         data->flags |= NFS_MOUNT_NOCTO;
 370                         } else if (!strcmp(opt, "ac")) {
 371                                 data->flags &= ~NFS_MOUNT_NOAC;
 372                                 if (!val)
 373                                         data->flags |= NFS_MOUNT_NOAC;
 374 #if NFS_MOUNT_VERSION >= 2
 375                         } else if (!strcmp(opt, "tcp")) {
 376                                 data->flags &= ~NFS_MOUNT_TCP;
 377                                 if (val) {
 378                                         if (nfs_mount_data_version < 2)
 379                                                 goto bad_option;
 380                                         nfs_pmap->pm_prot = IPPROTO_TCP;
 381                                         mnt_pmap->pm_prot = IPPROTO_TCP;
 382                                         data->flags |= NFS_MOUNT_TCP;
 383                                 } else {
 384                                         mnt_pmap->pm_prot = IPPROTO_UDP;
 385                                         nfs_pmap->pm_prot = IPPROTO_UDP;
 386                                 }
 387                         } else if (!strcmp(opt, "udp")) {
 388                                 data->flags &= ~NFS_MOUNT_TCP;
 389                                 if (!val) {
 390                                         if (nfs_mount_data_version < 2)
 391                                                 goto bad_option;
 392                                         nfs_pmap->pm_prot = IPPROTO_TCP;
 393                                         mnt_pmap->pm_prot = IPPROTO_TCP;
 394                                         data->flags |= NFS_MOUNT_TCP;
 395                                 } else {
 396                                         nfs_pmap->pm_prot = IPPROTO_UDP;
 397                                         mnt_pmap->pm_prot = IPPROTO_UDP;
 398                                 }
 399 #endif
 400 #if NFS_MOUNT_VERSION >= 3
 401                         } else if (!strcmp(opt, "lock")) {
 402                                 data->flags &= ~NFS_MOUNT_NONLM;
 403                                 if (!val) {
 404                                         if (nfs_mount_data_version < 3)
 405                                                 goto bad_option;
 406                                         data->flags |= NFS_MOUNT_NONLM;
 407                                 }
 408 #endif
 409 #if NFS_MOUNT_VERSION >= 4
 410                         } else if (!strcmp(opt, "broken_suid")) {
 411                                 data->flags &= ~NFS_MOUNT_BROKEN_SUID;
 412                                 if (val) {
 413                                         if (nfs_mount_data_version < 4)
 414                                                 goto bad_option;
 415                                         data->flags |= NFS_MOUNT_BROKEN_SUID;
 416                                 }
 417                         } else if (!strcmp(opt, "acl")) {
 418                                 data->flags &= ~NFS_MOUNT_NOACL;
 419                                 if (!val)
 420                                         data->flags |= NFS_MOUNT_NOACL;
 421                         } else if (!strcmp(opt, "rdirplus")) {
 422                                 data->flags &= ~NFS_MOUNT_NORDIRPLUS;
 423                                 if (!val)
 424                                         data->flags |= NFS_MOUNT_NORDIRPLUS;
 425                         } else if (!strcmp(opt, "sharecache")) {
 426                                 data->flags &= ~NFS_MOUNT_UNSHARED;
 427                                 if (!val)
 428                                         data->flags |= NFS_MOUNT_UNSHARED;
 429 #endif
 430                         } else {
 431                         bad_option:
 432                                 if (sloppy)
 433                                         continue;
 434                                 nfs_error(_("%s: Unsupported nfs mount option:"
 435                                                 " %s%s"), progname,
 436                                                 val ? "" : "no", opt);
 437                                 goto out_bad;
 438                         }
 439                         sprintf(cbuf, val ? "%s," : "no%s,", opt);
 440                 }
 441                 len += strlen(cbuf);
 442                 if (len >= opt_size) {
 443                         nfs_error(_("%s: excessively long option argument"),
 444                                         progname);
 445                         goto out_bad;
 446                 }
 447                 strcat(new_opts, cbuf);
 448         }
 449         /* See if the nfs host = mount host. */
 450         if (mounthost) {
 451                 if (!nfs_gethostbyname(mounthost, mnt_saddr))
 452                         goto out_bad;
 453                 *mnt_server->hostname = mounthost;
 454         }
 455         free(tmp_opts);
 456         return 1;
 457  bad_parameter:
 458         nfs_error(_("%s: Bad nfs mount parameter: %s\n"), progname, opt);
 459  out_bad:
 460         free(tmp_opts);
 461         return 0;
 462 }
 463
 464 static int nfsmnt_check_compat(const struct pmap *nfs_pmap,
 465                                 const struct pmap *mnt_pmap)
 466 {
 467         unsigned int max_nfs_vers = (nfs_mount_data_version >= 4) ? 3 : 2;
 468         unsigned int max_mnt_vers = (nfs_mount_data_version >= 4) ? 3 : 2;
 469
 470         if (nfs_pmap->pm_vers == 4) {
 471                 nfs_error(_("%s: Please use '-t nfs4' "
 472                                 "instead of '-o vers=4'"), progname);
 473                 goto out_bad;
 474         }
 475
 476         if (nfs_pmap->pm_vers) {
 477                 if (nfs_pmap->pm_vers > max_nfs_vers || nfs_pmap->pm_vers < 2) {
 478                         nfs_error(_("%s: NFS version %ld is not supported"),
 479                                         progname, nfs_pmap->pm_vers);
 480                         goto out_bad;
 481                 }
 482         }
 483
 484         if (mnt_pmap->pm_vers > max_mnt_vers) {
 485                 nfs_error(_("%s: NFS mount version %ld is not supported"),
 486                                 progname, mnt_pmap->pm_vers);
 487                 goto out_bad;
 488         }
 489
 490         return 1;
 491
 492 out_bad:
 493         return 0;
 494 }
 495
 496 int
 497 nfsmount(const char *spec, const char *node, int flags,
 498          char **extra_opts, int fake, int running_bg)
 499 {
 500         char hostdir[1024];
 501         char *hostname, *dirname, *old_opts, *mounthost = NULL;
 502         char new_opts[1024], cbuf[1024];
 503         static struct nfs_mount_data data;
 504         int val;
 505         static int doonce = 0;
 506
 507         clnt_addr_t mnt_server = {
 508                 .hostname = &mounthost
 509         };
 510         clnt_addr_t nfs_server = {
 511                 .hostname = &hostname
 512         };
 513         struct sockaddr_in *nfs_saddr = &nfs_server.saddr;
 514         struct pmap  *mnt_pmap = &mnt_server.pmap,
 515                      *nfs_pmap = &nfs_server.pmap;
 516         struct pmap  save_mnt, save_nfs;
 517
 518         int fsock = -1;
 519
 520         mntres_t mntres;
 521
 522         struct stat statbuf;
 523         char *s;
 524         int bg, retry;
 525         int retval = EX_FAIL;
 526         time_t t;
 527         time_t prevt;
 528         time_t timeout;
 529
 530         if (strlen(spec) >= sizeof(hostdir)) {
 531                 nfs_error(_("%s: excessively long host:dir argument"),
 532                                 progname);
 533                 goto fail;
 534         }
 535         strcpy(hostdir, spec);
 536         if ((s = strchr(hostdir, ':'))) {
 537                 hostname = hostdir;
 538                 dirname = s + 1;
 539                 *s = '\0';
 540                 /* Ignore all but first hostname in replicated mounts
 541                    until they can be fully supported. (mack@sgi.com) */
 542                 if ((s = strchr(hostdir, ','))) {
 543                         *s = '\0';
 544                         nfs_error(_("%s: warning: "
 545                                   "multiple hostnames not supported"),
 546                                         progname);
 547                 }
 548         } else {
 549                 nfs_error(_("%s: directory to mount not in host:dir format"),
 550                                 progname);
 551                 goto fail;
 552         }
 553
 554         if (!nfs_gethostbyname(hostname, nfs_saddr))
 555                 goto fail;
 556         mounthost = hostname;
 557         memcpy (&mnt_server.saddr, nfs_saddr, sizeof (mnt_server.saddr));
 558
 559         /* add IP address to mtab options for use when unmounting */
 560
 561         s = inet_ntoa(nfs_saddr->sin_addr);
 562         old_opts = *extra_opts;
 563         if (!old_opts)
 564                 old_opts = "";
 565
 566         /* Set default options.
 567          * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
 568          * let the kernel decide.
 569          * timeo is filled in after we know whether it'll be TCP or UDP. */
 570         memset(&data, 0, sizeof(data));
 571         data.acregmin   = 3;
 572         data.acregmax   = 60;
 573         data.acdirmin   = 30;
 574         data.acdirmax   = 60;
 575 #if NFS_MOUNT_VERSION >= 2
 576         data.namlen     = NAME_MAX;
 577 #endif
 578
 579         bg = 0;
 580         retry = -1;
 581
 582         memset(mnt_pmap, 0, sizeof(*mnt_pmap));
 583         mnt_pmap->pm_prog = MOUNTPROG;
 584         memset(nfs_pmap, 0, sizeof(*nfs_pmap));
 585         nfs_pmap->pm_prog = NFS_PROGRAM;
 586
 587         /* parse options */
 588         new_opts[0] = 0;
 589         if (!parse_options(old_opts, &data, &bg, &retry, &mnt_server, &nfs_server,
 590                            new_opts, sizeof(new_opts)))
 591                 goto fail;
 592         if (!nfsmnt_check_compat(nfs_pmap, mnt_pmap))
 593                 goto fail;
 594
 595         if (retry == -1) {
 596                 if (bg)
 597                         retry = 10000;  /* 10000 mins == ~1 week*/
 598                 else
 599                         retry = 2;      /* 2 min default on fg mounts */
 600         }
 601
 602 #ifdef NFS_MOUNT_DEBUG
 603         printf(_("rsize = %d, wsize = %d, timeo = %d, retrans = %d\n"),
 604                data.rsize, data.wsize, data.timeo, data.retrans);
 605         printf(_("acreg (min, max) = (%d, %d), acdir (min, max) = (%d, %d)\n"),
 606                data.acregmin, data.acregmax, data.acdirmin, data.acdirmax);
 607         printf(_("port = %lu, bg = %d, retry = %d, flags = %.8x\n"),
 608                nfs_pmap->pm_port, bg, retry, data.flags);
 609         printf(_("mountprog = %lu, mountvers = %lu, nfsprog = %lu, nfsvers = %lu\n"),
 610                mnt_pmap->pm_prog, mnt_pmap->pm_vers,
 611                nfs_pmap->pm_prog, nfs_pmap->pm_vers);
 612         printf(_("soft = %d, intr = %d, posix = %d, nocto = %d, noac = %d"),
 613                (data.flags & NFS_MOUNT_SOFT) != 0,
 614                (data.flags & NFS_MOUNT_INTR) != 0,
 615                (data.flags & NFS_MOUNT_POSIX) != 0,
 616                (data.flags & NFS_MOUNT_NOCTO) != 0,
 617                (data.flags & NFS_MOUNT_NOAC) != 0);
 618 #if NFS_MOUNT_VERSION >= 2
 619         printf(_(", tcp = %d"),
 620                (data.flags & NFS_MOUNT_TCP) != 0);
 621 #endif
 622 #if NFS_MOUNT_VERSION >= 4
 623         printf(_(", noacl = %d"), (data.flags & NFS_MOUNT_NOACL) != 0);
 624 #endif
 625 #if NFS_MOUNT_VERSION >= 5
 626         printf(_(", sec = %u"), data.pseudoflavor);
 627         printf(_(", readdirplus = %d"), (data.flags & NFS_MOUNT_NORDIRPLUS) != 0);
 628 #endif
 629         printf("\n");
 630 #endif
 631
 632         data.version = nfs_mount_data_version;
 633
 634         if (flags & MS_REMOUNT)
 635                 goto out_ok;
 636
 637         /* create mount deamon client */
 638
 639         /*
 640          * The following loop implements the mount retries. On the first
 641          * call, "running_bg" is 0. When the mount times out, and the
 642          * "bg" option is set, the exit status EX_BG will be returned.
 643          * For a backgrounded mount, there will be a second call by the
 644          * child process with "running_bg" set to 1.
 645          *
 646          * The case where the mount point is not present and the "bg"
 647          * option is set, is treated as a timeout. This is done to
 648          * support nested mounts.
 649          *
 650          * The "retry" count specified by the user is the number of
 651          * minutes to retry before giving up.
 652          *
 653          * Only the first error message will be displayed.
 654          */
 655         timeout = time(NULL) + 60 * retry;
 656         prevt = 0;
 657         t = 30;
 658         val = 1;
 659
 660         memcpy(&save_nfs, nfs_pmap, sizeof(save_nfs));
 661         memcpy(&save_mnt, mnt_pmap, sizeof(save_mnt));
 662         for (;;) {
 663                 if (bg && stat(node, &statbuf) == -1) {
 664                         /* no mount point yet - sleep */
 665                         if (running_bg) {
 666                                 sleep(val);     /* 1, 2, 4, 8, 16, 30, ... */
 667                                 val *= 2;
 668                                 if (val > 30)
 669                                         val = 30;
 670                         }
 671                 } else {
 672                         int stat;
 673                         /* be careful not to use too many CPU cycles */
 674                         if (t - prevt < 30)
 675                                 sleep(30);
 676
 677                         stat = nfs_call_mount(&mnt_server, &nfs_server,
 678                                               &dirname, &mntres);
 679                         if (stat)
 680                                 break;
 681                         memcpy(nfs_pmap, &save_nfs, sizeof(*nfs_pmap));
 682                         memcpy(mnt_pmap, &save_mnt, sizeof(*mnt_pmap));
 683                         prevt = t;
 684                 }
 685                 if (!bg) {
 686                         switch(rpc_createerr.cf_stat){
 687                         case RPC_TIMEDOUT:
 688                                 break;
 689                         case RPC_SYSTEMERROR:
 690                                 if (errno == ETIMEDOUT)
 691                                         break;
 692                         default:
 693                                 rpc_mount_errors(*nfs_server.hostname, 0, bg);
 694                         goto fail;
 695                         }
 696                         t = time(NULL);
 697                         if (t >= timeout) {
 698                                 rpc_mount_errors(*nfs_server.hostname, 0, bg);
 699                                 goto fail;
 700                         }
 701                         rpc_mount_errors(*nfs_server.hostname, 1, bg);
 702                         continue;
 703                 }
 704                 if (!running_bg) {
 705                         if (retry > 0)
 706                                 retval = EX_BG;
 707                         goto fail;
 708                 }
 709                 t = time(NULL);
 710                 if (t >= timeout) {
 711                         rpc_mount_errors(*nfs_server.hostname, 0, bg);
 712                         goto fail;
 713                 }
 714                 if (doonce++ < 1)
 715                         rpc_mount_errors(*nfs_server.hostname, 1, bg);
 716         }
 717
 718         if (mnt_pmap->pm_vers <= 2) {
 719                 if (mntres.nfsv2.fhs_status != 0) {
 720                         nfs_error(_("%s: %s:%s failed, reason given by server: %s"),
 721                                         progname, hostname, dirname,
 722                                         nfs_strerror(mntres.nfsv2.fhs_status));
 723                         goto fail;
 724                 }
 725                 memcpy(data.root.data,
 726                        (char *) mntres.nfsv2.fhstatus_u.fhs_fhandle,
 727                        NFS_FHSIZE);
 728 #if NFS_MOUNT_VERSION >= 4
 729                 data.root.size = NFS_FHSIZE;
 730                 memcpy(data.old_root.data,
 731                        (char *) mntres.nfsv2.fhstatus_u.fhs_fhandle,
 732                        NFS_FHSIZE);
 733 #endif
 734         } else {
 735 #if NFS_MOUNT_VERSION >= 4
 736                 mountres3_ok *mountres;
 737                 fhandle3 *fhandle;
 738                 int i,  n_flavors, *flavor, yum = 0;
 739                 if (mntres.nfsv3.fhs_status != 0) {
 740                         nfs_error(_("%s: %s:%s failed, reason given by server: %s"),
 741                                         progname, hostname, dirname,
 742                                         nfs_strerror(mntres.nfsv3.fhs_status));
 743                         goto fail;
 744                 }
 745 #if NFS_MOUNT_VERSION >= 5
 746                 mountres = &mntres.nfsv3.mountres3_u.mountinfo;
 747                 n_flavors = mountres->auth_flavors.auth_flavors_len;
 748                 if (n_flavors <= 0)
 749                         goto noauth_flavors;
 750
 751                 flavor = mountres->auth_flavors.auth_flavors_val;
 752                 for (i = 0; i < n_flavors; ++i) {
 753                         /*
 754                          * Per RFC2623, section 2.7, we should prefer the
 755                          * flavour listed first.
 756                          * If no flavour requested, use the first simple
 757                          * flavour that is offered.
 758                          */
 759                         if (! (data.flags & NFS_MOUNT_SECFLAVOUR) &&
 760                             (flavor[i] == AUTH_SYS ||
 761                              flavor[i] == AUTH_NONE)) {
 762                                 data.pseudoflavor = flavor[i];
 763                                 data.flags |= NFS_MOUNT_SECFLAVOUR;
 764                         }
 765                         if (flavor[i] == data.pseudoflavor)
 766                                 yum = 1;
 767 #ifdef NFS_MOUNT_DEBUG
 768                         printf(_("auth flavor %d: %d\n"), i, flavor[i]);
 769 #endif
 770                 }
 771                 if (!yum) {
 772                         nfs_error(_("%s: %s:%s failed, security flavor "
 773                                         "not supported"),
 774                                         progname, hostname, dirname);
 775                         /* server has registered us in rmtab, send umount */
 776                         nfs_call_umount(&mnt_server, &dirname);
 777                         goto fail;
 778                 }
 779 noauth_flavors:
 780 #endif
 781                 fhandle = &mntres.nfsv3.mountres3_u.mountinfo.fhandle;
 782                 memset(data.old_root.data, 0, NFS_FHSIZE);
 783                 memset(&data.root, 0, sizeof(data.root));
 784                 data.root.size = fhandle->fhandle3_len;
 785                 memcpy(data.root.data,
 786                        (char *) fhandle->fhandle3_val,
 787                        fhandle->fhandle3_len);
 788
 789                 data.flags |= NFS_MOUNT_VER3;
 790 #endif
 791         }
 792
 793         if (nfs_mount_data_version == 1) {
 794                 /* create nfs socket for kernel */
 795                 if (nfs_pmap->pm_prot == IPPROTO_TCP)
 796                         fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 797                 else
 798                         fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 799                 if (fsock < 0) {
 800                         perror(_("nfs socket"));
 801                         goto fail;
 802                 }
 803                 if (bindresvport(fsock, 0) < 0) {
 804                         perror(_("nfs bindresvport"));
 805                         goto fail;
 806                 }
 807         }
 808
 809 #ifdef NFS_MOUNT_DEBUG
 810         printf(_("using port %lu for nfs deamon\n"), nfs_pmap->pm_port);
 811 #endif
 812         nfs_saddr->sin_port = htons(nfs_pmap->pm_port);
 813         /*
 814          * connect() the socket for kernels 1.3.10 and below only,
 815          * to avoid problems with multihomed hosts.
 816          * --Swen
 817          */
 818         if (linux_version_code() <= MAKE_VERSION(1, 3, 10) && fsock != -1
 819             && connect(fsock, (struct sockaddr *) nfs_saddr,
 820                        sizeof (*nfs_saddr)) < 0) {
 821                 perror(_("nfs connect"));
 822                 goto fail;
 823         }
 824
 825 #if NFS_MOUNT_VERSION >= 2
 826         if (nfs_pmap->pm_prot == IPPROTO_TCP)
 827                 data.flags |= NFS_MOUNT_TCP;
 828         else
 829                 data.flags &= ~NFS_MOUNT_TCP;
 830 #endif
 831
 832         /* prepare data structure for kernel */
 833
 834         data.fd = fsock;
 835         memcpy((char *) &data.addr, (char *) nfs_saddr, sizeof(data.addr));
 836         strncpy(data.hostname, hostname, sizeof(data.hostname));
 837
 838  out_ok:
 839         /* Ensure we have enough padding for the following strcat()s */
 840         if (strlen(new_opts) + strlen(s) + 30 >= sizeof(new_opts)) {
 841                 nfs_error(_("%s: excessively long option argument"),
 842                                 progname);
 843                 goto fail;
 844         }
 845
 846         snprintf(cbuf, sizeof(cbuf)-1, "addr=%s", s);
 847         strcat(new_opts, cbuf);
 848
 849         *extra_opts = xstrdup(new_opts);
 850
 851         if (!fake && !(data.flags & NFS_MOUNT_NONLM)) {
 852                 if (!start_statd()) {
 853                         nfs_error(_("%s: rpc.statd is not running but is "
 854                                 "required for remote locking.\n"
 855                                 "   Either use '-o nolock' to keep "
 856                                 "locks local, or start statd."),
 857                                         progname);
 858                         goto fail;
 859                 }
 860         }
 861
 862         if (!fake) {
 863                 if (mount(spec, node, "nfs",
 864                                 flags & ~(MS_USER|MS_USERS), &data)) {
 865                         mount_error(spec, node, errno);
 866                         goto fail;
 867                 }
 868         }
 869
 870         return EX_SUCCESS;
 871
 872         /* abort */
 873  fail:
 874         if (fsock != -1)
 875                 close(fsock);
 876         return retval;
 877 }