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 #include <ctype.h>
  39 #include <unistd.h>
  40 #include <stdio.h>
  41 #include <string.h>
  42 #include <stdlib.h>
  43 #include <errno.h>
  44 #include <netdb.h>
  45 #include <time.h>
  46 #include <rpc/rpc.h>
  47 #include <rpc/pmap_prot.h>
  48 #include <rpc/pmap_clnt.h>
  49 #include <sys/socket.h>
  50 #include <sys/time.h>
  51 #include <sys/stat.h>
  52 #include <netinet/in.h>
  53 #include <arpa/inet.h>
  54 #include <mntent.h>
  55 #include <sys/mount.h>
  56 #include <paths.h>
  57 #include <syslog.h>
  58
  59 #include "conn.h"
  60 #include "xcommon.h"
  61 #include "mount.h"
  62 #include "nfsumount.h"
  63 #include "nfs_mount.h"
  64 #include "mount_constants.h"
  65 #include "nls.h"
  66 #include "error.h"
  67 #include "network.h"
  68
  69 #ifndef NFS_PORT
  70 #define NFS_PORT 2049
  71 #endif
  72 #ifndef NFS_FHSIZE
  73 #define NFS_FHSIZE 32
  74 #endif
  75
  76 #ifndef HAVE_INET_ATON
  77 #define inet_aton(a,b) (0)
  78 #endif
  79
  80 typedef dirpath mnt2arg_t;
  81 typedef dirpath mnt3arg_t;
  82 typedef dirpath mntarg_t;
  83
  84 typedef struct fhstatus  mnt2res_t;
  85 typedef struct mountres3 mnt3res_t;
  86 typedef union {
  87         mnt2res_t nfsv2;
  88         mnt3res_t nfsv3;
  89 } mntres_t;
  90
  91 extern int nfs_mount_data_version;
  92 extern char *progname;
  93 extern int verbose;
  94 extern int sloppy;
  95
  96 extern int linux_version_code(void);
  97
  98 static inline enum clnt_stat
  99 nfs3_mount(CLIENT *clnt, mnt3arg_t *mnt3arg, mnt3res_t *mnt3res)
 100 {
 101         return clnt_call(clnt, MOUNTPROC3_MNT,
 102                          (xdrproc_t) xdr_dirpath, (caddr_t) mnt3arg,
 103                          (xdrproc_t) xdr_mountres3, (caddr_t) mnt3res,
 104                          TIMEOUT);
 105 }
 106
 107 static inline enum clnt_stat
 108 nfs2_mount(CLIENT *clnt, mnt2arg_t *mnt2arg, mnt2res_t *mnt2res)
 109 {
 110         return clnt_call(clnt, MOUNTPROC_MNT,
 111                          (xdrproc_t) xdr_dirpath, (caddr_t) mnt2arg,
 112                          (xdrproc_t) xdr_fhstatus, (caddr_t) mnt2res,
 113                          TIMEOUT);
 114 }
 115
 116 static int
 117 nfs_call_mount(clnt_addr_t *mnt_server, clnt_addr_t *nfs_server,
 118                mntarg_t *mntarg, mntres_t *mntres)
 119 {
 120         CLIENT *clnt;
 121         enum clnt_stat stat;
 122         int msock;
 123
 124         if (!probe_bothports(mnt_server, nfs_server))
 125                 goto out_bad;
 126
 127         clnt = mnt_openclnt(mnt_server, &msock);
 128         if (!clnt)
 129                 goto out_bad;
 130         /* make pointers in xdr_mountres3 NULL so
 131          * that xdr_array allocates memory for us
 132          */
 133         memset(mntres, 0, sizeof(*mntres));
 134         switch (mnt_server->pmap.pm_vers) {
 135         case 3:
 136                 stat = nfs3_mount(clnt, mntarg, &mntres->nfsv3);
 137                 break;
 138         case 2:
 139         case 1:
 140                 stat = nfs2_mount(clnt, mntarg, &mntres->nfsv2);
 141                 break;
 142         default:
 143                 goto out_bad;
 144         }
 145         if (stat != RPC_SUCCESS) {
 146                 clnt_geterr(clnt, &rpc_createerr.cf_error);
 147                 rpc_createerr.cf_stat = stat;
 148         }
 149         mnt_closeclnt(clnt, msock);
 150         if (stat == RPC_SUCCESS)
 151                 return 1;
 152  out_bad:
 153         return 0;
 154 }
 155
 156 static int
 157 parse_options(char *old_opts, struct nfs_mount_data *data,
 158               int *bg, int *retry, clnt_addr_t *mnt_server,
 159               clnt_addr_t *nfs_server, char *new_opts, const int opt_size)
 160 {
 161         struct sockaddr_in *mnt_saddr = &mnt_server->saddr;
 162         struct pmap *mnt_pmap = &mnt_server->pmap;
 163         struct pmap *nfs_pmap = &nfs_server->pmap;
 164         int len;
 165         char *opt, *opteq, *p, *opt_b;
 166         char *mounthost = NULL;
 167         char cbuf[128];
 168         int open_quote = 0;
 169
 170         data->flags = 0;
 171         *bg = 0;
 172
 173         len = strlen(new_opts);
 174         for (p=old_opts, opt_b=NULL; p && *p; p++) {
 175                 if (!opt_b)
 176                         opt_b = p;              /* begin of the option item */
 177                 if (*p == '"')
 178                         open_quote ^= 1;        /* reverse the status */
 179                 if (open_quote)
 180                         continue;               /* still in a quoted block */
 181                 if (*p == ',')
 182                         *p = '\0';              /* terminate the option item */
 183                 if (*p == '\0' || *(p+1) == '\0') {
 184                         opt = opt_b;            /* opt is useful now */
 185                         opt_b = NULL;
 186                 }
 187                 else
 188                         continue;               /* still somewhere in the option item */
 189
 190                 if (strlen(opt) >= sizeof(cbuf))
 191                         goto bad_parameter;
 192                 if ((opteq = strchr(opt, '=')) && isdigit(opteq[1])) {
 193                         int val = atoi(opteq + 1);
 194                         *opteq = '\0';
 195 /* printf("opt=%s\n", opt); */
 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 s 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)
 495 {
 496         static char *prev_bg_host;
 497         char hostdir[1024];
 498         char *hostname, *dirname, *old_opts, *mounthost = NULL;
 499         char new_opts[1024], cbuf[1024];
 500         static struct nfs_mount_data data;
 501         int val, running_bg = 0;
 502         static int doonce = 0;
 503
 504         clnt_addr_t mnt_server = { &mounthost, };
 505         clnt_addr_t nfs_server = { &hostname, };
 506         struct sockaddr_in *nfs_saddr = &nfs_server.saddr;
 507         struct pmap  *mnt_pmap = &mnt_server.pmap,
 508                      *nfs_pmap = &nfs_server.pmap;
 509         struct pmap  save_mnt, save_nfs;
 510
 511         int fsock = -1;
 512
 513         mntres_t mntres;
 514
 515         struct stat statbuf;
 516         char *s;
 517         int bg, retry;
 518         int retval = EX_FAIL;
 519         time_t t;
 520         time_t prevt;
 521         time_t timeout;
 522
 523         if (strlen(spec) >= sizeof(hostdir)) {
 524                 nfs_error(_("%s: excessively long host:dir argument"),
 525                                 progname);
 526                 goto fail;
 527         }
 528         strcpy(hostdir, spec);
 529         if ((s = strchr(hostdir, ':'))) {
 530                 hostname = hostdir;
 531                 dirname = s + 1;
 532                 *s = '\0';
 533                 /* Ignore all but first hostname in replicated mounts
 534                    until they can be fully supported. (mack@sgi.com) */
 535                 if ((s = strchr(hostdir, ','))) {
 536                         *s = '\0';
 537                         nfs_error(_("%s: warning: "
 538                                   "multiple hostnames not supported"),
 539                                         progname);
 540                 }
 541         } else {
 542                 nfs_error(_("%s: directory to mount not in host:dir format"),
 543                                 progname);
 544                 goto fail;
 545         }
 546
 547         if (!nfs_gethostbyname(hostname, nfs_saddr))
 548                 goto fail;
 549         mounthost = hostname;
 550         memcpy (&mnt_server.saddr, nfs_saddr, sizeof (mnt_server.saddr));
 551
 552         /* add IP address to mtab options for use when unmounting */
 553
 554         s = inet_ntoa(nfs_saddr->sin_addr);
 555         old_opts = *extra_opts;
 556         if (!old_opts)
 557                 old_opts = "";
 558
 559         /* Set default options.
 560          * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
 561          * let the kernel decide.
 562          * timeo is filled in after we know whether it'll be TCP or UDP. */
 563         memset(&data, 0, sizeof(data));
 564         data.acregmin   = 3;
 565         data.acregmax   = 60;
 566         data.acdirmin   = 30;
 567         data.acdirmax   = 60;
 568 #if NFS_MOUNT_VERSION >= 2
 569         data.namlen     = NAME_MAX;
 570 #endif
 571
 572         bg = 0;
 573         retry = 10000;          /* 10000 minutes ~ 1 week */
 574
 575         memset(mnt_pmap, 0, sizeof(*mnt_pmap));
 576         mnt_pmap->pm_prog = MOUNTPROG;
 577         memset(nfs_pmap, 0, sizeof(*nfs_pmap));
 578         nfs_pmap->pm_prog = NFS_PROGRAM;
 579
 580         /* parse options */
 581         new_opts[0] = 0;
 582         if (!parse_options(old_opts, &data, &bg, &retry, &mnt_server, &nfs_server,
 583                            new_opts, sizeof(new_opts)))
 584                 goto fail;
 585         if (!nfsmnt_check_compat(nfs_pmap, mnt_pmap))
 586                 goto fail;
 587
 588         if (retry == 10000 && !bg)
 589                 retry = 2; /* reset for fg mounts */
 590
 591
 592 #ifdef NFS_MOUNT_DEBUG
 593         printf("rsize = %d, wsize = %d, timeo = %d, retrans = %d\n",
 594                data.rsize, data.wsize, data.timeo, data.retrans);
 595         printf("acreg (min, max) = (%d, %d), acdir (min, max) = (%d, %d)\n",
 596                data.acregmin, data.acregmax, data.acdirmin, data.acdirmax);
 597         printf("port = %d, bg = %d, retry = %d, flags = %.8x\n",
 598                nfs_pmap->pm_port, bg, retry, data.flags);
 599         printf("mountprog = %d, mountvers = %d, nfsprog = %d, nfsvers = %d\n",
 600                mnt_pmap->pm_prog, mnt_pmap->pm_vers,
 601                nfs_pmap->pm_prog, nfs_pmap->pm_vers);
 602         printf("soft = %d, intr = %d, posix = %d, nocto = %d, noac = %d ",
 603                (data.flags & NFS_MOUNT_SOFT) != 0,
 604                (data.flags & NFS_MOUNT_INTR) != 0,
 605                (data.flags & NFS_MOUNT_POSIX) != 0,
 606                (data.flags & NFS_MOUNT_NOCTO) != 0,
 607                (data.flags & NFS_MOUNT_NOAC) != 0);
 608 #if NFS_MOUNT_VERSION >= 2
 609         printf("tcp = %d ",
 610                (data.flags & NFS_MOUNT_TCP) != 0);
 611 #endif
 612 #if NFS_MOUNT_VERSION >= 4
 613         printf("noacl = %d ", (data.flags & NFS_MOUNT_NOACL) != 0);
 614 #endif
 615 #if NFS_MOUNT_VERSION >= 5
 616         printf("sec = %u ", data.pseudoflavor);
 617         printf("readdirplus = %d ", (data.flags & NFS_MOUNT_NORDIRPLUS) != 0);
 618 #endif
 619         printf("\n");
 620 #endif
 621
 622         data.version = nfs_mount_data_version;
 623
 624         if (flags & MS_REMOUNT)
 625                 goto out_ok;
 626
 627         /*
 628          * If the previous mount operation on the same host was
 629          * backgrounded, and the "bg" for this mount is also set,
 630          * give up immediately, to avoid the initial timeout.
 631          */
 632         if (bg && !running_bg &&
 633             prev_bg_host && strcmp(hostname, prev_bg_host) == 0) {
 634                 if (retry > 0)
 635                         retval = EX_BG;
 636                 return retval;
 637         }
 638
 639         /* create mount deamon client */
 640
 641         /*
 642          * The following loop implements the mount retries. On the first
 643          * call, "running_bg" is 0. When the mount times out, and the
 644          * "bg" option is set, the exit status EX_BG will be returned.
 645          * For a backgrounded mount, there will be a second call by the
 646          * child process with "running_bg" set to 1.
 647          *
 648          * The case where the mount point is not present and the "bg"
 649          * option is set, is treated as a timeout. This is done to
 650          * support nested mounts.
 651          *
 652          * The "retry" count specified by the user is the number of
 653          * minutes to retry before giving up.
 654          *
 655          * Only the first error message will be displayed.
 656          */
 657         timeout = time(NULL) + 60 * retry;
 658         prevt = 0;
 659         t = 30;
 660         val = 1;
 661
 662         memcpy(&save_nfs, nfs_pmap, sizeof(save_nfs));
 663         memcpy(&save_mnt, mnt_pmap, sizeof(save_mnt));
 664         for (;;) {
 665                 if (bg && stat(node, &statbuf) == -1) {
 666                         /* no mount point yet - sleep */
 667                         if (running_bg) {
 668                                 sleep(val);     /* 1, 2, 4, 8, 16, 30, ... */
 669                                 val *= 2;
 670                                 if (val > 30)
 671                                         val = 30;
 672                         }
 673                 } else {
 674                         int stat;
 675                         /* be careful not to use too many CPU cycles */
 676                         if (t - prevt < 30)
 677                                 sleep(30);
 678
 679                         stat = nfs_call_mount(&mnt_server, &nfs_server,
 680                                               &dirname, &mntres);
 681                         if (stat)
 682                                 break;
 683                         memcpy(nfs_pmap, &save_nfs, sizeof(*nfs_pmap));
 684                         memcpy(mnt_pmap, &save_mnt, sizeof(*mnt_pmap));
 685                         prevt = t;
 686                 }
 687                 if (!bg) {
 688                         switch(rpc_createerr.cf_stat){
 689                         case RPC_TIMEDOUT:
 690                                 break;
 691                         case RPC_SYSTEMERROR:
 692                                 if (errno == ETIMEDOUT)
 693                                         break;
 694                         default:
 695                                 mount_errors(*nfs_server.hostname, 0, bg);
 696                         goto fail;
 697                         }
 698                         t = time(NULL);
 699                         if (t >= timeout) {
 700                                 mount_errors(*nfs_server.hostname, 0, bg);
 701                                 goto fail;
 702                         }
 703                         mount_errors(*nfs_server.hostname, 1, bg);
 704                         continue;
 705                 }
 706                 if (!running_bg) {
 707                         prev_bg_host = xstrdup(hostname);
 708                         if (retry > 0)
 709                                 retval = EX_BG;
 710                         goto fail;
 711                 }
 712                 t = time(NULL);
 713                 if (t >= timeout) {
 714                         mount_errors(*nfs_server.hostname, 0, bg);
 715                         goto fail;
 716                 }
 717                 if (doonce++ < 1)
 718                         mount_errors(*nfs_server.hostname, 1, bg);
 719         }
 720
 721         if (nfs_pmap->pm_vers == 2) {
 722                 if (mntres.nfsv2.fhs_status != 0) {
 723                         nfs_error(_("%s: %s:%s failed, reason given by server: %s"),
 724                                         progname, hostname, dirname,
 725                                         nfs_strerror(mntres.nfsv2.fhs_status));
 726                         goto fail;
 727                 }
 728                 memcpy(data.root.data,
 729                        (char *) mntres.nfsv2.fhstatus_u.fhs_fhandle,
 730                        NFS_FHSIZE);
 731 #if NFS_MOUNT_VERSION >= 4
 732                 data.root.size = NFS_FHSIZE;
 733                 memcpy(data.old_root.data,
 734                        (char *) mntres.nfsv2.fhstatus_u.fhs_fhandle,
 735                        NFS_FHSIZE);
 736 #endif
 737         } else {
 738 #if NFS_MOUNT_VERSION >= 4
 739                 mountres3_ok *mountres;
 740                 fhandle3 *fhandle;
 741                 int i, *flavor, yum = 0;
 742                 if (mntres.nfsv3.fhs_status != 0) {
 743                         nfs_error(_("%s: %s:%s failed, reason given by server: %s"),
 744                                         progname, hostname, dirname,
 745                                         nfs_strerror(mntres.nfsv3.fhs_status));
 746                         goto fail;
 747                 }
 748 #if NFS_MOUNT_VERSION >= 5
 749                 mountres = &mntres.nfsv3.mountres3_u.mountinfo;
 750                 i = mountres->auth_flavors.auth_flavors_len;
 751                 if (i <= 0)
 752                         goto noauth_flavors;
 753
 754                 flavor = mountres->auth_flavors.auth_flavors_val;
 755                 while (--i >= 0) {
 756                         /* If no flavour requested, use 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",
 769                                 i, flavor[i]);
 770 #endif
 771                 }
 772                 if (!yum) {
 773                         nfs_error(_("%s: %s:%s failed, security flavor "
 774                                         "not supported"),
 775                                         progname, hostname, dirname);
 776                         /* server has registered us in rmtab, send umount */
 777                         nfs_call_umount(&mnt_server, &dirname);
 778                         goto fail;
 779                 }
 780 noauth_flavors:
 781 #endif
 782                 fhandle = &mntres.nfsv3.mountres3_u.mountinfo.fhandle;
 783                 memset(data.old_root.data, 0, NFS_FHSIZE);
 784                 memset(&data.root, 0, sizeof(data.root));
 785                 data.root.size = fhandle->fhandle3_len;
 786                 memcpy(data.root.data,
 787                        (char *) fhandle->fhandle3_val,
 788                        fhandle->fhandle3_len);
 789
 790                 data.flags |= NFS_MOUNT_VER3;
 791 #endif
 792         }
 793
 794         if (nfs_mount_data_version == 1) {
 795                 /* create nfs socket for kernel */
 796                 if (nfs_pmap->pm_prot == IPPROTO_TCP)
 797                         fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 798                 else
 799                         fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 800                 if (fsock < 0) {
 801                         perror(_("nfs socket"));
 802                         goto fail;
 803                 }
 804                 if (bindresvport(fsock, 0) < 0) {
 805                         perror(_("nfs bindresvport"));
 806                         goto fail;
 807                 }
 808         }
 809
 810 #ifdef NFS_MOUNT_DEBUG
 811         printf(_("using port %d for nfs deamon\n"), nfs_pmap->pm_port);
 812 #endif
 813         nfs_saddr->sin_port = htons(nfs_pmap->pm_port);
 814         /*
 815          * connect() the socket for kernels 1.3.10 and below only,
 816          * to avoid problems with multihomed hosts.
 817          * --Swen
 818          */
 819         if (linux_version_code() <= 0x01030a && fsock != -1
 820             && connect(fsock, (struct sockaddr *) nfs_saddr,
 821                        sizeof (*nfs_saddr)) < 0) {
 822                 perror(_("nfs connect"));
 823                 goto fail;
 824         }
 825
 826 #if NFS_MOUNT_VERSION >= 2
 827         if (nfs_pmap->pm_prot == IPPROTO_TCP)
 828                 data.flags |= NFS_MOUNT_TCP;
 829         else
 830                 data.flags &= ~NFS_MOUNT_TCP;
 831 #endif
 832
 833         /* prepare data structure for kernel */
 834
 835         data.fd = fsock;
 836         memcpy((char *) &data.addr, (char *) nfs_saddr, sizeof(data.addr));
 837         strncpy(data.hostname, hostname, sizeof(data.hostname));
 838
 839  out_ok:
 840         /* Ensure we have enough padding for the following strcat()s */
 841         if (strlen(new_opts) + strlen(s) + 30 >= sizeof(new_opts)) {
 842                 nfs_error(_("%s: excessively long option argument"),
 843                                 progname);
 844                 goto fail;
 845         }
 846
 847         snprintf(cbuf, sizeof(cbuf)-1, "addr=%s", s);
 848         strcat(new_opts, cbuf);
 849
 850         *extra_opts = xstrdup(new_opts);
 851
 852         if (!fake && !(data.flags & NFS_MOUNT_NONLM)) {
 853                 if (!start_statd()) {
 854                         nfs_error(_("%s: rpc.statd is not running but is "
 855                                 "required for remote locking.\n"
 856                                 "   Either use '-o nolocks' to keep "
 857                                 "locks local, or start statd."),
 858                                         progname);
 859                         goto fail;
 860                 }
 861         }
 862
 863         if (!fake) {
 864                 if (mount(spec, node, "nfs",
 865                                 flags & ~(MS_USER|MS_USERS), &data)) {
 866                         mount_error(spec, node, errno);
 867                         goto fail;
 868                 }
 869         }
 870
 871         return 0;
 872
 873         /* abort */
 874  fail:
 875         if (fsock != -1)
 876                 close(fsock);
 877         return retval;
 878 }