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 Mi¶kiewicz <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 #ifndef NFS_PORT
  73 #define NFS_PORT 2049
  74 #endif
  75 #ifndef NFS_FHSIZE
  76 #define NFS_FHSIZE 32
  77 #endif
  78
  79 #ifndef HAVE_INET_ATON
  80 #define inet_aton(a,b) (0)
  81 #endif
  82
  83 typedef dirpath mnt2arg_t;
  84 typedef dirpath mnt3arg_t;
  85 typedef dirpath mntarg_t;
  86
  87 typedef struct fhstatus  mnt2res_t;
  88 typedef struct mountres3 mnt3res_t;
  89 typedef union {
  90         mnt2res_t nfsv2;
  91         mnt3res_t nfsv3;
  92 } mntres_t;
  93
  94 extern int nfs_mount_data_version;
  95 extern char *progname;
  96 extern int verbose;
  97 extern int sloppy;
  98
  99 static inline enum clnt_stat
 100 nfs3_mount(CLIENT *clnt, mnt3arg_t *mnt3arg, mnt3res_t *mnt3res)
 101 {
 102         return clnt_call(clnt, MOUNTPROC3_MNT,
 103                          (xdrproc_t) xdr_dirpath, (caddr_t) mnt3arg,
 104                          (xdrproc_t) xdr_mountres3, (caddr_t) mnt3res,
 105                          TIMEOUT);
 106 }
 107
 108 static inline enum clnt_stat
 109 nfs2_mount(CLIENT *clnt, mnt2arg_t *mnt2arg, mnt2res_t *mnt2res)
 110 {
 111         return clnt_call(clnt, MOUNTPROC_MNT,
 112                          (xdrproc_t) xdr_dirpath, (caddr_t) mnt2arg,
 113                          (xdrproc_t) xdr_fhstatus, (caddr_t) mnt2res,
 114                          TIMEOUT);
 115 }
 116
 117 static int
 118 nfs_call_mount(clnt_addr_t *mnt_server, clnt_addr_t *nfs_server,
 119                mntarg_t *mntarg, mntres_t *mntres)
 120 {
 121         CLIENT *clnt;
 122         enum clnt_stat stat;
 123         int msock;
 124
 125         if (!probe_bothports(mnt_server, nfs_server))
 126                 goto out_bad;
 127
 128         clnt = mnt_openclnt(mnt_server, &msock);
 129         if (!clnt)
 130                 goto out_bad;
 131         /* make pointers in xdr_mountres3 NULL so
 132          * that xdr_array allocates memory for us
 133          */
 134         memset(mntres, 0, sizeof(*mntres));
 135         switch (mnt_server->pmap.pm_vers) {
 136         case 3:
 137                 stat = nfs3_mount(clnt, mntarg, &mntres->nfsv3);
 138                 break;
 139         case 2:
 140         case 1:
 141                 stat = nfs2_mount(clnt, mntarg, &mntres->nfsv2);
 142                 break;
 143         default:
 144                 goto out_bad;
 145         }
 146         if (stat != RPC_SUCCESS) {
 147                 clnt_geterr(clnt, &rpc_createerr.cf_error);
 148                 rpc_createerr.cf_stat = stat;
 149         }
 150         mnt_closeclnt(clnt, msock);
 151         if (stat == RPC_SUCCESS)
 152                 return 1;
 153  out_bad:
 154         return 0;
 155 }
 156
 157 static int
 158 parse_options(char *old_opts, struct nfs_mount_data *data,
 159               int *bg, int *retry, clnt_addr_t *mnt_server,
 160               clnt_addr_t *nfs_server, char *new_opts, const int opt_size)
 161 {
 162         struct sockaddr_in *mnt_saddr = &mnt_server->saddr;
 163         struct pmap *mnt_pmap = &mnt_server->pmap;
 164         struct pmap *nfs_pmap = &nfs_server->pmap;
 165         int len;
 166         char *opt, *opteq, *p, *opt_b;
 167         char *mounthost = NULL;
 168         char cbuf[128];
 169         int open_quote = 0;
 170
 171         data->flags = 0;
 172         *bg = 0;
 173
 174         len = strlen(new_opts);
 175         for (p=old_opts, opt_b=NULL; p && *p; p++) {
 176                 if (!opt_b)
 177                         opt_b = p;              /* begin of the option item */
 178                 if (*p == '"')
 179                         open_quote ^= 1;        /* reverse the status */
 180                 if (open_quote)
 181                         continue;               /* still in a quoted block */
 182                 if (*p == ',')
 183                         *p = '\0';              /* terminate the option item */
 184                 if (*p == '\0' || *(p+1) == '\0') {
 185                         opt = opt_b;            /* opt is useful now */
 186                         opt_b = NULL;
 187                 }
 188                 else
 189                         continue;               /* still somewhere in the option item */
 190
 191                 if (strlen(opt) >= sizeof(cbuf))
 192                         goto bad_parameter;
 193                 if ((opteq = strchr(opt, '=')) && isdigit(opteq[1])) {
 194                         int val = atoi(opteq + 1);
 195                         *opteq = '\0';
 196                         if (!strcmp(opt, "rsize"))
 197                                 data->rsize = val;
 198                         else if (!strcmp(opt, "wsize"))
 199                                 data->wsize = val;
 200                         else if (!strcmp(opt, "timeo"))
 201                                 data->timeo = val;
 202                         else if (!strcmp(opt, "retrans"))
 203                                 data->retrans = val;
 204                         else if (!strcmp(opt, "acregmin"))
 205                                 data->acregmin = val;
 206                         else if (!strcmp(opt, "acregmax"))
 207                                 data->acregmax = val;
 208                         else if (!strcmp(opt, "acdirmin"))
 209                                 data->acdirmin = val;
 210                         else if (!strcmp(opt, "acdirmax"))
 211                                 data->acdirmax = val;
 212                         else if (!strcmp(opt, "actimeo")) {
 213                                 data->acregmin = val;
 214                                 data->acregmax = val;
 215                                 data->acdirmin = val;
 216                                 data->acdirmax = val;
 217                         }
 218                         else if (!strcmp(opt, "retry"))
 219                                 *retry = val;
 220                         else if (!strcmp(opt, "port"))
 221                                 nfs_pmap->pm_port = val;
 222                         else if (!strcmp(opt, "mountport"))
 223                                 mnt_pmap->pm_port = val;
 224                         else if (!strcmp(opt, "mountprog"))
 225                                 mnt_pmap->pm_prog = val;
 226                         else if (!strcmp(opt, "mountvers"))
 227                                 mnt_pmap->pm_vers = val;
 228                         else if (!strcmp(opt, "mounthost"))
 229                                 mounthost=xstrndup(opteq+1, strcspn(opteq+1," \t\n\r,"));
 230                         else if (!strcmp(opt, "nfsprog"))
 231                                 nfs_pmap->pm_prog = val;
 232                         else if (!strcmp(opt, "nfsvers") ||
 233                                  !strcmp(opt, "vers")) {
 234                                 nfs_pmap->pm_vers = val;
 235                                 opt = "nfsvers";
 236 #if NFS_MOUNT_VERSION >= 2
 237                         } else if (!strcmp(opt, "namlen")) {
 238                                 if (nfs_mount_data_version >= 2)
 239                                         data->namlen = val;
 240                                 else if (sloppy)
 241                                         continue;
 242                                 else
 243                                         goto bad_parameter;
 244 #endif
 245                         } else if (!strcmp(opt, "addr")) {
 246                                 /* ignore */;
 247                                 continue;
 248                         } else if (sloppy)
 249                                 continue;
 250                         else
 251                                 goto bad_parameter;
 252                         sprintf(cbuf, "%s=%s,", opt, opteq+1);
 253                 } else if (opteq) {
 254                         *opteq = '\0';
 255                         if (!strcmp(opt, "proto")) {
 256                                 if (!strcmp(opteq+1, "udp")) {
 257                                         nfs_pmap->pm_prot = IPPROTO_UDP;
 258                                         mnt_pmap->pm_prot = IPPROTO_UDP;
 259 #if NFS_MOUNT_VERSION >= 2
 260                                         data->flags &= ~NFS_MOUNT_TCP;
 261                                 } else if (!strcmp(opteq+1, "tcp") &&
 262                                            nfs_mount_data_version > 2) {
 263                                         nfs_pmap->pm_prot = IPPROTO_TCP;
 264                                         mnt_pmap->pm_prot = IPPROTO_TCP;
 265                                         data->flags |= NFS_MOUNT_TCP;
 266 #endif
 267                                 } else if (sloppy)
 268                                         continue;
 269                                 else
 270                                         goto bad_parameter;
 271 #if NFS_MOUNT_VERSION >= 5
 272                         } else if (!strcmp(opt, "sec")) {
 273                                 char *secflavor = opteq+1;
 274                                 /* see RFC 2623 */
 275                                 if (nfs_mount_data_version < 5) {
 276                                         printf(_("Warning: ignoring sec=%s option\n"),
 277                                                         secflavor);
 278                                         continue;
 279                                 } else if (!strcmp(secflavor, "none"))
 280                                         data->pseudoflavor = AUTH_NONE;
 281                                 else if (!strcmp(secflavor, "sys"))
 282                                         data->pseudoflavor = AUTH_SYS;
 283                                 else if (!strcmp(secflavor, "krb5"))
 284                                         data->pseudoflavor = AUTH_GSS_KRB5;
 285                                 else if (!strcmp(secflavor, "krb5i"))
 286                                         data->pseudoflavor = AUTH_GSS_KRB5I;
 287                                 else if (!strcmp(secflavor, "krb5p"))
 288                                         data->pseudoflavor = AUTH_GSS_KRB5P;
 289                                 else if (!strcmp(secflavor, "lipkey"))
 290                                         data->pseudoflavor = AUTH_GSS_LKEY;
 291                                 else if (!strcmp(secflavor, "lipkey-i"))
 292                                         data->pseudoflavor = AUTH_GSS_LKEYI;
 293                                 else if (!strcmp(secflavor, "lipkey-p"))
 294                                         data->pseudoflavor = AUTH_GSS_LKEYP;
 295                                 else if (!strcmp(secflavor, "spkm3"))
 296                                         data->pseudoflavor = AUTH_GSS_SPKM;
 297                                 else if (!strcmp(secflavor, "spkm3i"))
 298                                         data->pseudoflavor = AUTH_GSS_SPKMI;
 299                                 else if (!strcmp(secflavor, "spkm3p"))
 300                                         data->pseudoflavor = AUTH_GSS_SPKMP;
 301                                 else if (sloppy)
 302                                         continue;
 303                                 else {
 304                                         printf(_("Warning: Unrecognized security flavor %s.\n"),
 305                                                 secflavor);
 306                                         goto bad_parameter;
 307                                 }
 308                                 data->flags |= NFS_MOUNT_SECFLAVOUR;
 309 #endif
 310                         } else if (!strcmp(opt, "mounthost"))
 311                                 mounthost=xstrndup(opteq+1,
 312                                                    strcspn(opteq+1," \t\n\r,"));
 313                          else if (!strcmp(opt, "context")) {
 314                                 char *context = opteq + 1;
 315                                 int ctxlen = strlen(context);
 316
 317                                 if (ctxlen > NFS_MAX_CONTEXT_LEN) {
 318                                         nfs_error(_("context parameter exceeds"
 319                                                         " limit of %d"),
 320                                                         NFS_MAX_CONTEXT_LEN);
 321                                         goto bad_parameter;
 322                                 }
 323                                 /* The context string is in the format of
 324                                  * "system_u:object_r:...".  We only want
 325                                  * the context str between the quotes.
 326                                  */
 327                                 if (*context == '"')
 328                                         strncpy(data->context, context+1,
 329                                                         ctxlen-2);
 330                                 else
 331                                         strncpy(data->context, context,
 332                                                         NFS_MAX_CONTEXT_LEN);
 333                         } else if (sloppy)
 334                                 continue;
 335                         else
 336                                 goto bad_parameter;
 337                         sprintf(cbuf, "%s=%s,", opt, opteq+1);
 338                 } else {
 339                         int val = 1;
 340                         if (!strncmp(opt, "no", 2)) {
 341                                 val = 0;
 342                                 opt += 2;
 343                         }
 344                         if (!strcmp(opt, "bg"))
 345                                 *bg = val;
 346                         else if (!strcmp(opt, "fg"))
 347                                 *bg = !val;
 348                         else if (!strcmp(opt, "soft")) {
 349                                 data->flags &= ~NFS_MOUNT_SOFT;
 350                                 if (val)
 351                                         data->flags |= NFS_MOUNT_SOFT;
 352                         } else if (!strcmp(opt, "hard")) {
 353                                 data->flags &= ~NFS_MOUNT_SOFT;
 354                                 if (!val)
 355                                         data->flags |= NFS_MOUNT_SOFT;
 356                         } else if (!strcmp(opt, "intr")) {
 357                                 data->flags &= ~NFS_MOUNT_INTR;
 358                                 if (val)
 359                                         data->flags |= NFS_MOUNT_INTR;
 360                         } else if (!strcmp(opt, "posix")) {
 361                                 data->flags &= ~NFS_MOUNT_POSIX;
 362                                 if (val)
 363                                         data->flags |= NFS_MOUNT_POSIX;
 364                         } else if (!strcmp(opt, "cto")) {
 365                                 data->flags &= ~NFS_MOUNT_NOCTO;
 366                                 if (!val)
 367                                         data->flags |= NFS_MOUNT_NOCTO;
 368                         } else if (!strcmp(opt, "ac")) {
 369                                 data->flags &= ~NFS_MOUNT_NOAC;
 370                                 if (!val)
 371                                         data->flags |= NFS_MOUNT_NOAC;
 372 #if NFS_MOUNT_VERSION >= 2
 373                         } else if (!strcmp(opt, "tcp")) {
 374                                 data->flags &= ~NFS_MOUNT_TCP;
 375                                 if (val) {
 376                                         if (nfs_mount_data_version < 2)
 377                                                 goto bad_option;
 378                                         nfs_pmap->pm_prot = IPPROTO_TCP;
 379                                         mnt_pmap->pm_prot = IPPROTO_TCP;
 380                                         data->flags |= NFS_MOUNT_TCP;
 381                                 } else {
 382                                         mnt_pmap->pm_prot = IPPROTO_UDP;
 383                                         nfs_pmap->pm_prot = IPPROTO_UDP;
 384                                 }
 385                         } else if (!strcmp(opt, "udp")) {
 386                                 data->flags &= ~NFS_MOUNT_TCP;
 387                                 if (!val) {
 388                                         if (nfs_mount_data_version < 2)
 389                                                 goto bad_option;
 390                                         nfs_pmap->pm_prot = IPPROTO_TCP;
 391                                         mnt_pmap->pm_prot = IPPROTO_TCP;
 392                                         data->flags |= NFS_MOUNT_TCP;
 393                                 } else {
 394                                         nfs_pmap->pm_prot = IPPROTO_UDP;
 395                                         mnt_pmap->pm_prot = IPPROTO_UDP;
 396                                 }
 397 #endif
 398 #if NFS_MOUNT_VERSION >= 3
 399                         } else if (!strcmp(opt, "lock")) {
 400                                 data->flags &= ~NFS_MOUNT_NONLM;
 401                                 if (!val) {
 402                                         if (nfs_mount_data_version < 3)
 403                                                 goto bad_option;
 404                                         data->flags |= NFS_MOUNT_NONLM;
 405                                 }
 406 #endif
 407 #if NFS_MOUNT_VERSION >= 4
 408                         } else if (!strcmp(opt, "broken_suid")) {
 409                                 data->flags &= ~NFS_MOUNT_BROKEN_SUID;
 410                                 if (val) {
 411                                         if (nfs_mount_data_version < 4)
 412                                                 goto bad_option;
 413                                         data->flags |= NFS_MOUNT_BROKEN_SUID;
 414                                 }
 415                         } else if (!strcmp(opt, "acl")) {
 416                                 data->flags &= ~NFS_MOUNT_NOACL;
 417                                 if (!val)
 418                                         data->flags |= NFS_MOUNT_NOACL;
 419                         } else if (!strcmp(opt, "rdirplus")) {
 420                                 data->flags &= ~NFS_MOUNT_NORDIRPLUS;
 421                                 if (!val)
 422                                         data->flags |= NFS_MOUNT_NORDIRPLUS;
 423                         } else if (!strcmp(opt, "sharecache")) {
 424                                 data->flags &= ~NFS_MOUNT_UNSHARED;
 425                                 if (!val)
 426                                         data->flags |= NFS_MOUNT_UNSHARED;
 427 #endif
 428                         } else {
 429                         bad_option:
 430                                 if (sloppy)
 431                                         continue;
 432                                 nfs_error(_("%s: Unsupported nfs mount option:"
 433                                                 " %s%s"), progname,
 434                                                 val ? "" : "no", opt);
 435                                 goto out_bad;
 436                         }
 437                         sprintf(cbuf, val ? "%s," : "no%s,", opt);
 438                 }
 439                 len += strlen(cbuf);
 440                 if (len >= opt_size) {
 441                         nfs_error(_("%s: excessively long option argument"),
 442                                         progname);
 443                         goto out_bad;
 444                 }
 445                 strcat(new_opts, cbuf);
 446         }
 447         /* See if the nfs host = mount host. */
 448         if (mounthost) {
 449                 if (!nfs_gethostbyname(mounthost, mnt_saddr))
 450                         goto out_bad;
 451                 *mnt_server->hostname = mounthost;
 452         }
 453         return 1;
 454  bad_parameter:
 455         nfs_error(_("%s: Bad nfs mount parameter: %s\n"), progname, opt);
 456  out_bad:
 457         return 0;
 458 }
 459
 460 static int nfsmnt_check_compat(const struct pmap *nfs_pmap,
 461                                 const struct pmap *mnt_pmap)
 462 {
 463         unsigned int max_nfs_vers = (nfs_mount_data_version >= 4) ? 3 : 2;
 464         unsigned int max_mnt_vers = (nfs_mount_data_version >= 4) ? 3 : 2;
 465
 466         if (nfs_pmap->pm_vers == 4) {
 467                 nfs_error(_("%s: Please use '-t nfs4' "
 468                                 "instead of '-o vers=4'"), progname);
 469                 goto out_bad;
 470         }
 471
 472         if (nfs_pmap->pm_vers) {
 473                 if (nfs_pmap->pm_vers > max_nfs_vers || nfs_pmap->pm_vers < 2) {
 474                         nfs_error(_("%s: NFS version %ld is not supported"),
 475                                         progname, nfs_pmap->pm_vers);
 476                         goto out_bad;
 477                 }
 478         }
 479
 480         if (mnt_pmap->pm_vers > max_mnt_vers) {
 481                 nfs_error(_("%s: NFS mount version %ld is not supported"),
 482                                 progname, mnt_pmap->pm_vers);
 483                 goto out_bad;
 484         }
 485
 486         return 1;
 487
 488 out_bad:
 489         return 0;
 490 }
 491
 492 int
 493 nfsmount(const char *spec, const char *node, int flags,
 494          char **extra_opts, int fake, int running_bg)
 495 {
 496         char hostdir[1024];
 497         char *hostname, *dirname, *old_opts, *mounthost = NULL;
 498         char new_opts[1024], cbuf[1024];
 499         static struct nfs_mount_data data;
 500         int val;
 501         static int doonce = 0;
 502
 503         clnt_addr_t mnt_server = { &mounthost, };
 504         clnt_addr_t nfs_server = { &hostname, };
 505         struct sockaddr_in *nfs_saddr = &nfs_server.saddr;
 506         struct pmap  *mnt_pmap = &mnt_server.pmap,
 507                      *nfs_pmap = &nfs_server.pmap;
 508         struct pmap  save_mnt, save_nfs;
 509
 510         int fsock = -1;
 511
 512         mntres_t mntres;
 513
 514         struct stat statbuf;
 515         char *s;
 516         int bg, retry;
 517         int retval = EX_FAIL;
 518         time_t t;
 519         time_t prevt;
 520         time_t timeout;
 521
 522         if (strlen(spec) >= sizeof(hostdir)) {
 523                 nfs_error(_("%s: excessively long host:dir argument"),
 524                                 progname);
 525                 goto fail;
 526         }
 527         strcpy(hostdir, spec);
 528         if ((s = strchr(hostdir, ':'))) {
 529                 hostname = hostdir;
 530                 dirname = s + 1;
 531                 *s = '\0';
 532                 /* Ignore all but first hostname in replicated mounts
 533                    until they can be fully supported. (mack@sgi.com) */
 534                 if ((s = strchr(hostdir, ','))) {
 535                         *s = '\0';
 536                         nfs_error(_("%s: warning: "
 537                                   "multiple hostnames not supported"),
 538                                         progname);
 539                 }
 540         } else {
 541                 nfs_error(_("%s: directory to mount not in host:dir format"),
 542                                 progname);
 543                 goto fail;
 544         }
 545
 546         if (!nfs_gethostbyname(hostname, nfs_saddr))
 547                 goto fail;
 548         mounthost = hostname;
 549         memcpy (&mnt_server.saddr, nfs_saddr, sizeof (mnt_server.saddr));
 550
 551         /* add IP address to mtab options for use when unmounting */
 552
 553         s = inet_ntoa(nfs_saddr->sin_addr);
 554         old_opts = *extra_opts;
 555         if (!old_opts)
 556                 old_opts = "";
 557
 558         /* Set default options.
 559          * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
 560          * let the kernel decide.
 561          * timeo is filled in after we know whether it'll be TCP or UDP. */
 562         memset(&data, 0, sizeof(data));
 563         data.acregmin   = 3;
 564         data.acregmax   = 60;
 565         data.acdirmin   = 30;
 566         data.acdirmax   = 60;
 567 #if NFS_MOUNT_VERSION >= 2
 568         data.namlen     = NAME_MAX;
 569 #endif
 570
 571         bg = 0;
 572         retry = -1;
 573
 574         memset(mnt_pmap, 0, sizeof(*mnt_pmap));
 575         mnt_pmap->pm_prog = MOUNTPROG;
 576         memset(nfs_pmap, 0, sizeof(*nfs_pmap));
 577         nfs_pmap->pm_prog = NFS_PROGRAM;
 578
 579         /* parse options */
 580         new_opts[0] = 0;
 581         if (!parse_options(old_opts, &data, &bg, &retry, &mnt_server, &nfs_server,
 582                            new_opts, sizeof(new_opts)))
 583                 goto fail;
 584         if (!nfsmnt_check_compat(nfs_pmap, mnt_pmap))
 585                 goto fail;
 586
 587         if (retry == -1) {
 588                 if (bg)
 589                         retry = 10000;  /* 10000 mins == ~1 week*/
 590                 else
 591                         retry = 2;      /* 2 min default on fg mounts */
 592         }
 593
 594 #ifdef NFS_MOUNT_DEBUG
 595         printf(_("rsize = %d, wsize = %d, timeo = %d, retrans = %d\n"),
 596                data.rsize, data.wsize, data.timeo, data.retrans);
 597         printf(_("acreg (min, max) = (%d, %d), acdir (min, max) = (%d, %d)\n"),
 598                data.acregmin, data.acregmax, data.acdirmin, data.acdirmax);
 599         printf(_("port = %lu, bg = %d, retry = %d, flags = %.8x\n"),
 600                nfs_pmap->pm_port, bg, retry, data.flags);
 601         printf(_("mountprog = %lu, mountvers = %lu, nfsprog = %lu, nfsvers = %lu\n"),
 602                mnt_pmap->pm_prog, mnt_pmap->pm_vers,
 603                nfs_pmap->pm_prog, nfs_pmap->pm_vers);
 604         printf(_("soft = %d, intr = %d, posix = %d, nocto = %d, noac = %d"),
 605                (data.flags & NFS_MOUNT_SOFT) != 0,
 606                (data.flags & NFS_MOUNT_INTR) != 0,
 607                (data.flags & NFS_MOUNT_POSIX) != 0,
 608                (data.flags & NFS_MOUNT_NOCTO) != 0,
 609                (data.flags & NFS_MOUNT_NOAC) != 0);
 610 #if NFS_MOUNT_VERSION >= 2
 611         printf(_(", tcp = %d"),
 612                (data.flags & NFS_MOUNT_TCP) != 0);
 613 #endif
 614 #if NFS_MOUNT_VERSION >= 4
 615         printf(_(", noacl = %d"), (data.flags & NFS_MOUNT_NOACL) != 0);
 616 #endif
 617 #if NFS_MOUNT_VERSION >= 5
 618         printf(_(", sec = %u"), data.pseudoflavor);
 619         printf(_(", readdirplus = %d"), (data.flags & NFS_MOUNT_NORDIRPLUS) != 0);
 620 #endif
 621         printf("\n");
 622 #endif
 623
 624         data.version = nfs_mount_data_version;
 625
 626         if (flags & MS_REMOUNT)
 627                 goto out_ok;
 628
 629         /* create mount deamon client */
 630
 631         /*
 632          * The following loop implements the mount retries. On the first
 633          * call, "running_bg" is 0. When the mount times out, and the
 634          * "bg" option is set, the exit status EX_BG will be returned.
 635          * For a backgrounded mount, there will be a second call by the
 636          * child process with "running_bg" set to 1.
 637          *
 638          * The case where the mount point is not present and the "bg"
 639          * option is set, is treated as a timeout. This is done to
 640          * support nested mounts.
 641          *
 642          * The "retry" count specified by the user is the number of
 643          * minutes to retry before giving up.
 644          *
 645          * Only the first error message will be displayed.
 646          */
 647         timeout = time(NULL) + 60 * retry;
 648         prevt = 0;
 649         t = 30;
 650         val = 1;
 651
 652         memcpy(&save_nfs, nfs_pmap, sizeof(save_nfs));
 653         memcpy(&save_mnt, mnt_pmap, sizeof(save_mnt));
 654         for (;;) {
 655                 if (bg && stat(node, &statbuf) == -1) {
 656                         /* no mount point yet - sleep */
 657                         if (running_bg) {
 658                                 sleep(val);     /* 1, 2, 4, 8, 16, 30, ... */
 659                                 val *= 2;
 660                                 if (val > 30)
 661                                         val = 30;
 662                         }
 663                 } else {
 664                         int stat;
 665                         /* be careful not to use too many CPU cycles */
 666                         if (t - prevt < 30)
 667                                 sleep(30);
 668
 669                         stat = nfs_call_mount(&mnt_server, &nfs_server,
 670                                               &dirname, &mntres);
 671                         if (stat)
 672                                 break;
 673                         memcpy(nfs_pmap, &save_nfs, sizeof(*nfs_pmap));
 674                         memcpy(mnt_pmap, &save_mnt, sizeof(*mnt_pmap));
 675                         prevt = t;
 676                 }
 677                 if (!bg) {
 678                         switch(rpc_createerr.cf_stat){
 679                         case RPC_TIMEDOUT:
 680                                 break;
 681                         case RPC_SYSTEMERROR:
 682                                 if (errno == ETIMEDOUT)
 683                                         break;
 684                         default:
 685                                 rpc_mount_errors(*nfs_server.hostname, 0, bg);
 686                         goto fail;
 687                         }
 688                         t = time(NULL);
 689                         if (t >= timeout) {
 690                                 rpc_mount_errors(*nfs_server.hostname, 0, bg);
 691                                 goto fail;
 692                         }
 693                         rpc_mount_errors(*nfs_server.hostname, 1, bg);
 694                         continue;
 695                 }
 696                 if (!running_bg) {
 697                         if (retry > 0)
 698                                 retval = EX_BG;
 699                         goto fail;
 700                 }
 701                 t = time(NULL);
 702                 if (t >= timeout) {
 703                         rpc_mount_errors(*nfs_server.hostname, 0, bg);
 704                         goto fail;
 705                 }
 706                 if (doonce++ < 1)
 707                         rpc_mount_errors(*nfs_server.hostname, 1, bg);
 708         }
 709
 710         if (mnt_pmap->pm_vers <= 2) {
 711                 if (mntres.nfsv2.fhs_status != 0) {
 712                         nfs_error(_("%s: %s:%s failed, reason given by server: %s"),
 713                                         progname, hostname, dirname,
 714                                         nfs_strerror(mntres.nfsv2.fhs_status));
 715                         goto fail;
 716                 }
 717                 memcpy(data.root.data,
 718                        (char *) mntres.nfsv2.fhstatus_u.fhs_fhandle,
 719                        NFS_FHSIZE);
 720 #if NFS_MOUNT_VERSION >= 4
 721                 data.root.size = NFS_FHSIZE;
 722                 memcpy(data.old_root.data,
 723                        (char *) mntres.nfsv2.fhstatus_u.fhs_fhandle,
 724                        NFS_FHSIZE);
 725 #endif
 726         } else {
 727 #if NFS_MOUNT_VERSION >= 4
 728                 mountres3_ok *mountres;
 729                 fhandle3 *fhandle;
 730                 int i,  n_flavors, *flavor, yum = 0;
 731                 if (mntres.nfsv3.fhs_status != 0) {
 732                         nfs_error(_("%s: %s:%s failed, reason given by server: %s"),
 733                                         progname, hostname, dirname,
 734                                         nfs_strerror(mntres.nfsv3.fhs_status));
 735                         goto fail;
 736                 }
 737 #if NFS_MOUNT_VERSION >= 5
 738                 mountres = &mntres.nfsv3.mountres3_u.mountinfo;
 739                 n_flavors = mountres->auth_flavors.auth_flavors_len;
 740                 if (n_flavors <= 0)
 741                         goto noauth_flavors;
 742
 743                 flavor = mountres->auth_flavors.auth_flavors_val;
 744                 for (i = 0; i < n_flavors; ++i) {
 745                         /*
 746                          * Per RFC2623, section 2.7, we should prefer the
 747                          * flavour listed first.
 748                          * If no flavour requested, use the first simple
 749                          * flavour that is offered.
 750                          */
 751                         if (! (data.flags & NFS_MOUNT_SECFLAVOUR) &&
 752                             (flavor[i] == AUTH_SYS ||
 753                              flavor[i] == AUTH_NONE)) {
 754                                 data.pseudoflavor = flavor[i];
 755                                 data.flags |= NFS_MOUNT_SECFLAVOUR;
 756                         }
 757                         if (flavor[i] == data.pseudoflavor)
 758                                 yum = 1;
 759 #ifdef NFS_MOUNT_DEBUG
 760                         printf(_("auth flavor %d: %d\n"), i, flavor[i]);
 761 #endif
 762                 }
 763                 if (!yum) {
 764                         nfs_error(_("%s: %s:%s failed, security flavor "
 765                                         "not supported"),
 766                                         progname, hostname, dirname);
 767                         /* server has registered us in rmtab, send umount */
 768                         nfs_call_umount(&mnt_server, &dirname);
 769                         goto fail;
 770                 }
 771 noauth_flavors:
 772 #endif
 773                 fhandle = &mntres.nfsv3.mountres3_u.mountinfo.fhandle;
 774                 memset(data.old_root.data, 0, NFS_FHSIZE);
 775                 memset(&data.root, 0, sizeof(data.root));
 776                 data.root.size = fhandle->fhandle3_len;
 777                 memcpy(data.root.data,
 778                        (char *) fhandle->fhandle3_val,
 779                        fhandle->fhandle3_len);
 780
 781                 data.flags |= NFS_MOUNT_VER3;
 782 #endif
 783         }
 784
 785         if (nfs_mount_data_version == 1) {
 786                 /* create nfs socket for kernel */
 787                 if (nfs_pmap->pm_prot == IPPROTO_TCP)
 788                         fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 789                 else
 790                         fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 791                 if (fsock < 0) {
 792                         perror(_("nfs socket"));
 793                         goto fail;
 794                 }
 795                 if (bindresvport(fsock, 0) < 0) {
 796                         perror(_("nfs bindresvport"));
 797                         goto fail;
 798                 }
 799         }
 800
 801 #ifdef NFS_MOUNT_DEBUG
 802         printf(_("using port %lu for nfs deamon\n"), nfs_pmap->pm_port);
 803 #endif
 804         nfs_saddr->sin_port = htons(nfs_pmap->pm_port);
 805         /*
 806          * connect() the socket for kernels 1.3.10 and below only,
 807          * to avoid problems with multihomed hosts.
 808          * --Swen
 809          */
 810         if (linux_version_code() <= MAKE_VERSION(1, 3, 10) && fsock != -1
 811             && connect(fsock, (struct sockaddr *) nfs_saddr,
 812                        sizeof (*nfs_saddr)) < 0) {
 813                 perror(_("nfs connect"));
 814                 goto fail;
 815         }
 816
 817 #if NFS_MOUNT_VERSION >= 2
 818         if (nfs_pmap->pm_prot == IPPROTO_TCP)
 819                 data.flags |= NFS_MOUNT_TCP;
 820         else
 821                 data.flags &= ~NFS_MOUNT_TCP;
 822 #endif
 823
 824         /* prepare data structure for kernel */
 825
 826         data.fd = fsock;
 827         memcpy((char *) &data.addr, (char *) nfs_saddr, sizeof(data.addr));
 828         strncpy(data.hostname, hostname, sizeof(data.hostname));
 829
 830  out_ok:
 831         /* Ensure we have enough padding for the following strcat()s */
 832         if (strlen(new_opts) + strlen(s) + 30 >= sizeof(new_opts)) {
 833                 nfs_error(_("%s: excessively long option argument"),
 834                                 progname);
 835                 goto fail;
 836         }
 837
 838         snprintf(cbuf, sizeof(cbuf)-1, "addr=%s", s);
 839         strcat(new_opts, cbuf);
 840
 841         *extra_opts = xstrdup(new_opts);
 842
 843         if (!fake && !(data.flags & NFS_MOUNT_NONLM)) {
 844                 if (!start_statd()) {
 845                         nfs_error(_("%s: rpc.statd is not running but is "
 846                                 "required for remote locking.\n"
 847                                 "   Either use '-o nolock' to keep "
 848                                 "locks local, or start statd."),
 849                                         progname);
 850                         goto fail;
 851                 }
 852         }
 853
 854         if (!fake) {
 855                 if (mount(spec, node, "nfs",
 856                                 flags & ~(MS_USER|MS_USERS), &data)) {
 857                         mount_error(spec, node, errno);
 858                         goto fail;
 859                 }
 860         }
 861
 862         return EX_SUCCESS;
 863
 864         /* abort */
 865  fail:
 866         if (fsock != -1)
 867                 close(fsock);
 868         return retval;
 869 }