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 #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;
 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         for (p=old_opts, opt_b=NULL; p && *p; p++) {
 183                 if (!opt_b)
 184                         opt_b = p;              /* begin of the option item */
 185                 if (*p == '"')
 186                         open_quote ^= 1;        /* reverse the status */
 187                 if (open_quote)
 188                         continue;               /* still in a quoted block */
 189                 if (*p == ',')
 190                         *p = '\0';              /* terminate the option item */
 191                 if (*p == '\0' || *(p+1) == '\0') {
 192                         opt = opt_b;            /* opt is useful now */
 193                         opt_b = NULL;
 194                 }
 195                 else
 196                         continue;               /* still somewhere in the option item */
 197
 198                 if (strlen(opt) >= sizeof(cbuf))
 199                         goto bad_parameter;
 200                 if ((opteq = strchr(opt, '=')) && isdigit(opteq[1])) {
 201                         int val = atoi(opteq + 1);
 202                         *opteq = '\0';
 203                         if (!strcmp(opt, "rsize"))
 204                                 data->rsize = val;
 205                         else if (!strcmp(opt, "wsize"))
 206                                 data->wsize = val;
 207                         else if (!strcmp(opt, "timeo"))
 208                                 data->timeo = val;
 209                         else if (!strcmp(opt, "retrans"))
 210                                 data->retrans = val;
 211                         else if (!strcmp(opt, "acregmin"))
 212                                 data->acregmin = val;
 213                         else if (!strcmp(opt, "acregmax"))
 214                                 data->acregmax = val;
 215                         else if (!strcmp(opt, "acdirmin"))
 216                                 data->acdirmin = val;
 217                         else if (!strcmp(opt, "acdirmax"))
 218                                 data->acdirmax = val;
 219                         else if (!strcmp(opt, "actimeo")) {
 220                                 data->acregmin = val;
 221                                 data->acregmax = val;
 222                                 data->acdirmin = val;
 223                                 data->acdirmax = val;
 224                         }
 225                         else if (!strcmp(opt, "retry"))
 226                                 *retry = val;
 227                         else if (!strcmp(opt, "port"))
 228                                 nfs_pmap->pm_port = val;
 229                         else if (!strcmp(opt, "mountport"))
 230                                 mnt_pmap->pm_port = val;
 231                         else if (!strcmp(opt, "mountprog"))
 232                                 mnt_pmap->pm_prog = val;
 233                         else if (!strcmp(opt, "mountvers"))
 234                                 mnt_pmap->pm_vers = val;
 235                         else if (!strcmp(opt, "mounthost"))
 236                                 mounthost=xstrndup(opteq+1, strcspn(opteq+1," \t\n\r,"));
 237                         else if (!strcmp(opt, "nfsprog"))
 238                                 nfs_pmap->pm_prog = val;
 239                         else if (!strcmp(opt, "nfsvers") ||
 240                                  !strcmp(opt, "vers")) {
 241                                 nfs_pmap->pm_vers = val;
 242                                 opt = "nfsvers";
 243 #if NFS_MOUNT_VERSION >= 2
 244                         } else if (!strcmp(opt, "namlen")) {
 245                                 if (nfs_mount_data_version >= 2)
 246                                         data->namlen = val;
 247                                 else if (sloppy)
 248                                         continue;
 249                                 else
 250                                         goto bad_parameter;
 251 #endif
 252                         } else if (!strcmp(opt, "addr")) {
 253                                 /* ignore */;
 254                                 continue;
 255                         } else if (sloppy)
 256                                 continue;
 257                         else
 258                                 goto bad_parameter;
 259                         sprintf(cbuf, "%s=%s,", opt, opteq+1);
 260                 } else if (opteq) {
 261                         *opteq = '\0';
 262                         if (!strcmp(opt, "proto")) {
 263                                 if (!strcmp(opteq+1, "udp")) {
 264                                         nfs_pmap->pm_prot = IPPROTO_UDP;
 265                                         mnt_pmap->pm_prot = IPPROTO_UDP;
 266 #if NFS_MOUNT_VERSION >= 2
 267                                         data->flags &= ~NFS_MOUNT_TCP;
 268                                 } else if (!strcmp(opteq+1, "tcp") &&
 269                                            nfs_mount_data_version > 2) {
 270                                         nfs_pmap->pm_prot = IPPROTO_TCP;
 271                                         mnt_pmap->pm_prot = IPPROTO_TCP;
 272                                         data->flags |= NFS_MOUNT_TCP;
 273 #endif
 274                                 } else if (sloppy)
 275                                         continue;
 276                                 else
 277                                         goto bad_parameter;
 278 #if NFS_MOUNT_VERSION >= 5
 279                         } else if (!strcmp(opt, "sec")) {
 280                                 char *secflavor = opteq+1;
 281                                 /* see RFC 2623 */
 282                                 if (nfs_mount_data_version < 5) {
 283                                         printf(_("Warning: ignoring sec=%s option\n"),
 284                                                         secflavor);
 285                                         continue;
 286                                 } else if (!strcmp(secflavor, "none"))
 287                                         data->pseudoflavor = AUTH_NONE;
 288                                 else if (!strcmp(secflavor, "sys"))
 289                                         data->pseudoflavor = AUTH_SYS;
 290                                 else if (!strcmp(secflavor, "krb5"))
 291                                         data->pseudoflavor = AUTH_GSS_KRB5;
 292                                 else if (!strcmp(secflavor, "krb5i"))
 293                                         data->pseudoflavor = AUTH_GSS_KRB5I;
 294                                 else if (!strcmp(secflavor, "krb5p"))
 295                                         data->pseudoflavor = AUTH_GSS_KRB5P;
 296                                 else if (!strcmp(secflavor, "lipkey"))
 297                                         data->pseudoflavor = AUTH_GSS_LKEY;
 298                                 else if (!strcmp(secflavor, "lipkey-i"))
 299                                         data->pseudoflavor = AUTH_GSS_LKEYI;
 300                                 else if (!strcmp(secflavor, "lipkey-p"))
 301                                         data->pseudoflavor = AUTH_GSS_LKEYP;
 302                                 else if (!strcmp(secflavor, "spkm3"))
 303                                         data->pseudoflavor = AUTH_GSS_SPKM;
 304                                 else if (!strcmp(secflavor, "spkm3i"))
 305                                         data->pseudoflavor = AUTH_GSS_SPKMI;
 306                                 else if (!strcmp(secflavor, "spkm3p"))
 307                                         data->pseudoflavor = AUTH_GSS_SPKMP;
 308                                 else if (sloppy)
 309                                         continue;
 310                                 else {
 311                                         printf(_("Warning: Unrecognized security flavor %s.\n"),
 312                                                 secflavor);
 313                                         goto bad_parameter;
 314                                 }
 315                                 data->flags |= NFS_MOUNT_SECFLAVOUR;
 316 #endif
 317                         } else if (!strcmp(opt, "mounthost"))
 318                                 mounthost=xstrndup(opteq+1,
 319                                                    strcspn(opteq+1," \t\n\r,"));
 320                          else if (!strcmp(opt, "context")) {
 321                                 char *context = opteq + 1;
 322                                 int ctxlen = strlen(context);
 323
 324                                 if (ctxlen > NFS_MAX_CONTEXT_LEN) {
 325                                         nfs_error(_("context parameter exceeds"
 326                                                         " limit of %d"),
 327                                                         NFS_MAX_CONTEXT_LEN);
 328                                         goto bad_parameter;
 329                                 }
 330                                 /* The context string is in the format of
 331                                  * "system_u:object_r:...".  We only want
 332                                  * the context str between the quotes.
 333                                  */
 334                                 if (*context == '"')
 335                                         strncpy(data->context, context+1,
 336                                                         ctxlen-2);
 337                                 else
 338                                         strncpy(data->context, context,
 339                                                         NFS_MAX_CONTEXT_LEN);
 340                         } else if (sloppy)
 341                                 continue;
 342                         else
 343                                 goto bad_parameter;
 344                         sprintf(cbuf, "%s=%s,", opt, opteq+1);
 345                 } else {
 346                         int val = 1;
 347                         if (!strncmp(opt, "no", 2)) {
 348                                 val = 0;
 349                                 opt += 2;
 350                         }
 351                         if (!strcmp(opt, "bg"))
 352                                 *bg = val;
 353                         else if (!strcmp(opt, "fg"))
 354                                 *bg = !val;
 355                         else if (!strcmp(opt, "soft")) {
 356                                 data->flags &= ~NFS_MOUNT_SOFT;
 357                                 if (val)
 358                                         data->flags |= NFS_MOUNT_SOFT;
 359                         } else if (!strcmp(opt, "hard")) {
 360                                 data->flags &= ~NFS_MOUNT_SOFT;
 361                                 if (!val)
 362                                         data->flags |= NFS_MOUNT_SOFT;
 363                         } else if (!strcmp(opt, "intr")) {
 364                                 data->flags &= ~NFS_MOUNT_INTR;
 365                                 if (val)
 366                                         data->flags |= NFS_MOUNT_INTR;
 367                         } else if (!strcmp(opt, "posix")) {
 368                                 data->flags &= ~NFS_MOUNT_POSIX;
 369                                 if (val)
 370                                         data->flags |= NFS_MOUNT_POSIX;
 371                         } else if (!strcmp(opt, "cto")) {
 372                                 data->flags &= ~NFS_MOUNT_NOCTO;
 373                                 if (!val)
 374                                         data->flags |= NFS_MOUNT_NOCTO;
 375                         } else if (!strcmp(opt, "ac")) {
 376                                 data->flags &= ~NFS_MOUNT_NOAC;
 377                                 if (!val)
 378                                         data->flags |= NFS_MOUNT_NOAC;
 379 #if NFS_MOUNT_VERSION >= 2
 380                         } else if (!strcmp(opt, "tcp")) {
 381                                 data->flags &= ~NFS_MOUNT_TCP;
 382                                 if (val) {
 383                                         if (nfs_mount_data_version < 2)
 384                                                 goto bad_option;
 385                                         nfs_pmap->pm_prot = IPPROTO_TCP;
 386                                         mnt_pmap->pm_prot = IPPROTO_TCP;
 387                                         data->flags |= NFS_MOUNT_TCP;
 388                                 } else {
 389                                         mnt_pmap->pm_prot = IPPROTO_UDP;
 390                                         nfs_pmap->pm_prot = IPPROTO_UDP;
 391                                 }
 392                         } else if (!strcmp(opt, "udp")) {
 393                                 data->flags &= ~NFS_MOUNT_TCP;
 394                                 if (!val) {
 395                                         if (nfs_mount_data_version < 2)
 396                                                 goto bad_option;
 397                                         nfs_pmap->pm_prot = IPPROTO_TCP;
 398                                         mnt_pmap->pm_prot = IPPROTO_TCP;
 399                                         data->flags |= NFS_MOUNT_TCP;
 400                                 } else {
 401                                         nfs_pmap->pm_prot = IPPROTO_UDP;
 402                                         mnt_pmap->pm_prot = IPPROTO_UDP;
 403                                 }
 404 #endif
 405 #if NFS_MOUNT_VERSION >= 3
 406                         } else if (!strcmp(opt, "lock")) {
 407                                 data->flags &= ~NFS_MOUNT_NONLM;
 408                                 if (!val) {
 409                                         if (nfs_mount_data_version < 3)
 410                                                 goto bad_option;
 411                                         data->flags |= NFS_MOUNT_NONLM;
 412                                 }
 413 #endif
 414 #if NFS_MOUNT_VERSION >= 4
 415                         } else if (!strcmp(opt, "broken_suid")) {
 416                                 data->flags &= ~NFS_MOUNT_BROKEN_SUID;
 417                                 if (val) {
 418                                         if (nfs_mount_data_version < 4)
 419                                                 goto bad_option;
 420                                         data->flags |= NFS_MOUNT_BROKEN_SUID;
 421                                 }
 422                         } else if (!strcmp(opt, "acl")) {
 423                                 data->flags &= ~NFS_MOUNT_NOACL;
 424                                 if (!val)
 425                                         data->flags |= NFS_MOUNT_NOACL;
 426                         } else if (!strcmp(opt, "rdirplus")) {
 427                                 data->flags &= ~NFS_MOUNT_NORDIRPLUS;
 428                                 if (!val)
 429                                         data->flags |= NFS_MOUNT_NORDIRPLUS;
 430                         } else if (!strcmp(opt, "sharecache")) {
 431                                 data->flags &= ~NFS_MOUNT_UNSHARED;
 432                                 if (!val)
 433                                         data->flags |= NFS_MOUNT_UNSHARED;
 434 #endif
 435                         } else {
 436                         bad_option:
 437                                 if (sloppy)
 438                                         continue;
 439                                 nfs_error(_("%s: Unsupported nfs mount option:"
 440                                                 " %s%s"), progname,
 441                                                 val ? "" : "no", opt);
 442                                 goto out_bad;
 443                         }
 444                         sprintf(cbuf, val ? "%s," : "no%s,", opt);
 445                 }
 446                 len += strlen(cbuf);
 447                 if (len >= opt_size) {
 448                         nfs_error(_("%s: excessively long option argument"),
 449                                         progname);
 450                         goto out_bad;
 451                 }
 452                 strcat(new_opts, cbuf);
 453         }
 454         /* See if the nfs host = mount host. */
 455         if (mounthost) {
 456                 if (!nfs_gethostbyname(mounthost, mnt_saddr))
 457                         goto out_bad;
 458                 *mnt_server->hostname = mounthost;
 459         }
 460         return 1;
 461  bad_parameter:
 462         nfs_error(_("%s: Bad nfs mount parameter: %s\n"), progname, opt);
 463  out_bad:
 464         return 0;
 465 }
 466
 467 static int nfsmnt_check_compat(const struct pmap *nfs_pmap,
 468                                 const struct pmap *mnt_pmap)
 469 {
 470         unsigned int max_nfs_vers = (nfs_mount_data_version >= 4) ? 3 : 2;
 471         unsigned int max_mnt_vers = (nfs_mount_data_version >= 4) ? 3 : 2;
 472
 473         if (nfs_pmap->pm_vers == 4) {
 474                 nfs_error(_("%s: Please use '-t nfs4' "
 475                                 "instead of '-o vers=4'"), progname);
 476                 goto out_bad;
 477         }
 478
 479         if (nfs_pmap->pm_vers) {
 480                 if (nfs_pmap->pm_vers > max_nfs_vers || nfs_pmap->pm_vers < 2) {
 481                         nfs_error(_("%s: NFS version %ld is not supported"),
 482                                         progname, nfs_pmap->pm_vers);
 483                         goto out_bad;
 484                 }
 485         }
 486
 487         if (mnt_pmap->pm_vers > max_mnt_vers) {
 488                 nfs_error(_("%s: NFS mount version %ld is not supported"),
 489                                 progname, mnt_pmap->pm_vers);
 490                 goto out_bad;
 491         }
 492
 493         return 1;
 494
 495 out_bad:
 496         return 0;
 497 }
 498
 499 int
 500 nfsmount(const char *spec, const char *node, int flags,
 501          char **extra_opts, int fake, int running_bg)
 502 {
 503         char hostdir[1024];
 504         char *hostname, *dirname, *old_opts, *mounthost = NULL;
 505         char new_opts[1024], cbuf[1024];
 506         static struct nfs_mount_data data;
 507         int val;
 508         static int doonce = 0;
 509
 510         clnt_addr_t mnt_server = { &mounthost, };
 511         clnt_addr_t nfs_server = { &hostname, };
 512         struct sockaddr_in *nfs_saddr = &nfs_server.saddr;
 513         struct pmap  *mnt_pmap = &mnt_server.pmap,
 514                      *nfs_pmap = &nfs_server.pmap;
 515         struct pmap  save_mnt, save_nfs;
 516
 517         int fsock = -1;
 518
 519         mntres_t mntres;
 520
 521         struct stat statbuf;
 522         char *s;
 523         int bg, retry;
 524         int retval = EX_FAIL;
 525         time_t t;
 526         time_t prevt;
 527         time_t timeout;
 528
 529         if (strlen(spec) >= sizeof(hostdir)) {
 530                 nfs_error(_("%s: excessively long host:dir argument"),
 531                                 progname);
 532                 goto fail;
 533         }
 534         strcpy(hostdir, spec);
 535         if ((s = strchr(hostdir, ':'))) {
 536                 hostname = hostdir;
 537                 dirname = s + 1;
 538                 *s = '\0';
 539                 /* Ignore all but first hostname in replicated mounts
 540                    until they can be fully supported. (mack@sgi.com) */
 541                 if ((s = strchr(hostdir, ','))) {
 542                         *s = '\0';
 543                         nfs_error(_("%s: warning: "
 544                                   "multiple hostnames not supported"),
 545                                         progname);
 546                 }
 547         } else {
 548                 nfs_error(_("%s: directory to mount not in host:dir format"),
 549                                 progname);
 550                 goto fail;
 551         }
 552
 553         if (!nfs_gethostbyname(hostname, nfs_saddr))
 554                 goto fail;
 555         mounthost = hostname;
 556         memcpy (&mnt_server.saddr, nfs_saddr, sizeof (mnt_server.saddr));
 557
 558         /* add IP address to mtab options for use when unmounting */
 559
 560         s = inet_ntoa(nfs_saddr->sin_addr);
 561         old_opts = *extra_opts;
 562         if (!old_opts)
 563                 old_opts = "";
 564
 565         /* Set default options.
 566          * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
 567          * let the kernel decide.
 568          * timeo is filled in after we know whether it'll be TCP or UDP. */
 569         memset(&data, 0, sizeof(data));
 570         data.acregmin   = 3;
 571         data.acregmax   = 60;
 572         data.acdirmin   = 30;
 573         data.acdirmax   = 60;
 574 #if NFS_MOUNT_VERSION >= 2
 575         data.namlen     = NAME_MAX;
 576 #endif
 577
 578         bg = 0;
 579         retry = -1;
 580
 581         memset(mnt_pmap, 0, sizeof(*mnt_pmap));
 582         mnt_pmap->pm_prog = MOUNTPROG;
 583         memset(nfs_pmap, 0, sizeof(*nfs_pmap));
 584         nfs_pmap->pm_prog = NFS_PROGRAM;
 585
 586         /* parse options */
 587         new_opts[0] = 0;
 588         if (!parse_options(old_opts, &data, &bg, &retry, &mnt_server, &nfs_server,
 589                            new_opts, sizeof(new_opts)))
 590                 goto fail;
 591         if (!nfsmnt_check_compat(nfs_pmap, mnt_pmap))
 592                 goto fail;
 593
 594         if (retry == -1) {
 595                 if (bg)
 596                         retry = 10000;  /* 10000 mins == ~1 week*/
 597                 else
 598                         retry = 2;      /* 2 min default on fg mounts */
 599         }
 600
 601 #ifdef NFS_MOUNT_DEBUG
 602         printf(_("rsize = %d, wsize = %d, timeo = %d, retrans = %d\n"),
 603                data.rsize, data.wsize, data.timeo, data.retrans);
 604         printf(_("acreg (min, max) = (%d, %d), acdir (min, max) = (%d, %d)\n"),
 605                data.acregmin, data.acregmax, data.acdirmin, data.acdirmax);
 606         printf(_("port = %lu, bg = %d, retry = %d, flags = %.8x\n"),
 607                nfs_pmap->pm_port, bg, retry, data.flags);
 608         printf(_("mountprog = %lu, mountvers = %lu, nfsprog = %lu, nfsvers = %lu\n"),
 609                mnt_pmap->pm_prog, mnt_pmap->pm_vers,
 610                nfs_pmap->pm_prog, nfs_pmap->pm_vers);
 611         printf(_("soft = %d, intr = %d, posix = %d, nocto = %d, noac = %d"),
 612                (data.flags & NFS_MOUNT_SOFT) != 0,
 613                (data.flags & NFS_MOUNT_INTR) != 0,
 614                (data.flags & NFS_MOUNT_POSIX) != 0,
 615                (data.flags & NFS_MOUNT_NOCTO) != 0,
 616                (data.flags & NFS_MOUNT_NOAC) != 0);
 617 #if NFS_MOUNT_VERSION >= 2
 618         printf(_(", tcp = %d"),
 619                (data.flags & NFS_MOUNT_TCP) != 0);
 620 #endif
 621 #if NFS_MOUNT_VERSION >= 4
 622         printf(_(", noacl = %d"), (data.flags & NFS_MOUNT_NOACL) != 0);
 623 #endif
 624 #if NFS_MOUNT_VERSION >= 5
 625         printf(_(", sec = %u"), data.pseudoflavor);
 626         printf(_(", readdirplus = %d"), (data.flags & NFS_MOUNT_NORDIRPLUS) != 0);
 627 #endif
 628         printf("\n");
 629 #endif
 630
 631         data.version = nfs_mount_data_version;
 632
 633         if (flags & MS_REMOUNT)
 634                 goto out_ok;
 635
 636         /* create mount deamon client */
 637
 638         /*
 639          * The following loop implements the mount retries. On the first
 640          * call, "running_bg" is 0. When the mount times out, and the
 641          * "bg" option is set, the exit status EX_BG will be returned.
 642          * For a backgrounded mount, there will be a second call by the
 643          * child process with "running_bg" set to 1.
 644          *
 645          * The case where the mount point is not present and the "bg"
 646          * option is set, is treated as a timeout. This is done to
 647          * support nested mounts.
 648          *
 649          * The "retry" count specified by the user is the number of
 650          * minutes to retry before giving up.
 651          *
 652          * Only the first error message will be displayed.
 653          */
 654         timeout = time(NULL) + 60 * retry;
 655         prevt = 0;
 656         t = 30;
 657         val = 1;
 658
 659         memcpy(&save_nfs, nfs_pmap, sizeof(save_nfs));
 660         memcpy(&save_mnt, mnt_pmap, sizeof(save_mnt));
 661         for (;;) {
 662                 if (bg && stat(node, &statbuf) == -1) {
 663                         /* no mount point yet - sleep */
 664                         if (running_bg) {
 665                                 sleep(val);     /* 1, 2, 4, 8, 16, 30, ... */
 666                                 val *= 2;
 667                                 if (val > 30)
 668                                         val = 30;
 669                         }
 670                 } else {
 671                         int stat;
 672                         /* be careful not to use too many CPU cycles */
 673                         if (t - prevt < 30)
 674                                 sleep(30);
 675
 676                         stat = nfs_call_mount(&mnt_server, &nfs_server,
 677                                               &dirname, &mntres);
 678                         if (stat)
 679                                 break;
 680                         memcpy(nfs_pmap, &save_nfs, sizeof(*nfs_pmap));
 681                         memcpy(mnt_pmap, &save_mnt, sizeof(*mnt_pmap));
 682                         prevt = t;
 683                 }
 684                 if (!bg) {
 685                         switch(rpc_createerr.cf_stat){
 686                         case RPC_TIMEDOUT:
 687                                 break;
 688                         case RPC_SYSTEMERROR:
 689                                 if (errno == ETIMEDOUT)
 690                                         break;
 691                         default:
 692                                 rpc_mount_errors(*nfs_server.hostname, 0, bg);
 693                         goto fail;
 694                         }
 695                         t = time(NULL);
 696                         if (t >= timeout) {
 697                                 rpc_mount_errors(*nfs_server.hostname, 0, bg);
 698                                 goto fail;
 699                         }
 700                         rpc_mount_errors(*nfs_server.hostname, 1, bg);
 701                         continue;
 702                 }
 703                 if (!running_bg) {
 704                         if (retry > 0)
 705                                 retval = EX_BG;
 706                         goto fail;
 707                 }
 708                 t = time(NULL);
 709                 if (t >= timeout) {
 710                         rpc_mount_errors(*nfs_server.hostname, 0, bg);
 711                         goto fail;
 712                 }
 713                 if (doonce++ < 1)
 714                         rpc_mount_errors(*nfs_server.hostname, 1, bg);
 715         }
 716
 717         if (mnt_pmap->pm_vers <= 2) {
 718                 if (mntres.nfsv2.fhs_status != 0) {
 719                         nfs_error(_("%s: %s:%s failed, reason given by server: %s"),
 720                                         progname, hostname, dirname,
 721                                         nfs_strerror(mntres.nfsv2.fhs_status));
 722                         goto fail;
 723                 }
 724                 memcpy(data.root.data,
 725                        (char *) mntres.nfsv2.fhstatus_u.fhs_fhandle,
 726                        NFS_FHSIZE);
 727 #if NFS_MOUNT_VERSION >= 4
 728                 data.root.size = NFS_FHSIZE;
 729                 memcpy(data.old_root.data,
 730                        (char *) mntres.nfsv2.fhstatus_u.fhs_fhandle,
 731                        NFS_FHSIZE);
 732 #endif
 733         } else {
 734 #if NFS_MOUNT_VERSION >= 4
 735                 mountres3_ok *mountres;
 736                 fhandle3 *fhandle;
 737                 int i,  n_flavors, *flavor, yum = 0;
 738                 if (mntres.nfsv3.fhs_status != 0) {
 739                         nfs_error(_("%s: %s:%s failed, reason given by server: %s"),
 740                                         progname, hostname, dirname,
 741                                         nfs_strerror(mntres.nfsv3.fhs_status));
 742                         goto fail;
 743                 }
 744 #if NFS_MOUNT_VERSION >= 5
 745                 mountres = &mntres.nfsv3.mountres3_u.mountinfo;
 746                 n_flavors = mountres->auth_flavors.auth_flavors_len;
 747                 if (n_flavors <= 0)
 748                         goto noauth_flavors;
 749
 750                 flavor = mountres->auth_flavors.auth_flavors_val;
 751                 for (i = 0; i < n_flavors; ++i) {
 752                         /*
 753                          * Per RFC2623, section 2.7, we should prefer the
 754                          * flavour listed first.
 755                          * If no flavour requested, use the first simple
 756                          * flavour that is offered.
 757                          */
 758                         if (! (data.flags & NFS_MOUNT_SECFLAVOUR) &&
 759                             (flavor[i] == AUTH_SYS ||
 760                              flavor[i] == AUTH_NONE)) {
 761                                 data.pseudoflavor = flavor[i];
 762                                 data.flags |= NFS_MOUNT_SECFLAVOUR;
 763                         }
 764                         if (flavor[i] == data.pseudoflavor)
 765                                 yum = 1;
 766 #ifdef NFS_MOUNT_DEBUG
 767                         printf(_("auth flavor %d: %d\n"), i, flavor[i]);
 768 #endif
 769                 }
 770                 if (!yum) {
 771                         nfs_error(_("%s: %s:%s failed, security flavor "
 772                                         "not supported"),
 773                                         progname, hostname, dirname);
 774                         /* server has registered us in rmtab, send umount */
 775                         nfs_call_umount(&mnt_server, &dirname);
 776                         goto fail;
 777                 }
 778 noauth_flavors:
 779 #endif
 780                 fhandle = &mntres.nfsv3.mountres3_u.mountinfo.fhandle;
 781                 memset(data.old_root.data, 0, NFS_FHSIZE);
 782                 memset(&data.root, 0, sizeof(data.root));
 783                 data.root.size = fhandle->fhandle3_len;
 784                 memcpy(data.root.data,
 785                        (char *) fhandle->fhandle3_val,
 786                        fhandle->fhandle3_len);
 787
 788                 data.flags |= NFS_MOUNT_VER3;
 789 #endif
 790         }
 791
 792         if (nfs_mount_data_version == 1) {
 793                 /* create nfs socket for kernel */
 794                 if (nfs_pmap->pm_prot == IPPROTO_TCP)
 795                         fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 796                 else
 797                         fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 798                 if (fsock < 0) {
 799                         perror(_("nfs socket"));
 800                         goto fail;
 801                 }
 802                 if (bindresvport(fsock, 0) < 0) {
 803                         perror(_("nfs bindresvport"));
 804                         goto fail;
 805                 }
 806         }
 807
 808 #ifdef NFS_MOUNT_DEBUG
 809         printf(_("using port %lu for nfs deamon\n"), nfs_pmap->pm_port);
 810 #endif
 811         nfs_saddr->sin_port = htons(nfs_pmap->pm_port);
 812         /*
 813          * connect() the socket for kernels 1.3.10 and below only,
 814          * to avoid problems with multihomed hosts.
 815          * --Swen
 816          */
 817         if (linux_version_code() <= MAKE_VERSION(1, 3, 10) && fsock != -1
 818             && connect(fsock, (struct sockaddr *) nfs_saddr,
 819                        sizeof (*nfs_saddr)) < 0) {
 820                 perror(_("nfs connect"));
 821                 goto fail;
 822         }
 823
 824 #if NFS_MOUNT_VERSION >= 2
 825         if (nfs_pmap->pm_prot == IPPROTO_TCP)
 826                 data.flags |= NFS_MOUNT_TCP;
 827         else
 828                 data.flags &= ~NFS_MOUNT_TCP;
 829 #endif
 830
 831         /* prepare data structure for kernel */
 832
 833         data.fd = fsock;
 834         memcpy((char *) &data.addr, (char *) nfs_saddr, sizeof(data.addr));
 835         strncpy(data.hostname, hostname, sizeof(data.hostname));
 836
 837  out_ok:
 838         /* Ensure we have enough padding for the following strcat()s */
 839         if (strlen(new_opts) + strlen(s) + 30 >= sizeof(new_opts)) {
 840                 nfs_error(_("%s: excessively long option argument"),
 841                                 progname);
 842                 goto fail;
 843         }
 844
 845         snprintf(cbuf, sizeof(cbuf)-1, "addr=%s", s);
 846         strcat(new_opts, cbuf);
 847
 848         *extra_opts = xstrdup(new_opts);
 849
 850         if (!fake && !(data.flags & NFS_MOUNT_NONLM)) {
 851                 if (!start_statd()) {
 852                         nfs_error(_("%s: rpc.statd is not running but is "
 853                                 "required for remote locking.\n"
 854                                 "   Either use '-o nolock' to keep "
 855                                 "locks local, or start statd."),
 856                                         progname);
 857                         goto fail;
 858                 }
 859         }
 860
 861         if (!fake) {
 862                 if (mount(spec, node, "nfs",
 863                                 flags & ~(MS_USER|MS_USERS), &data)) {
 864                         mount_error(spec, node, errno);
 865                         goto fail;
 866                 }
 867         }
 868
 869         return EX_SUCCESS;
 870
 871         /* abort */
 872  fail:
 873         if (fsock != -1)
 874                 close(fsock);
 875         return retval;
 876 }