utils/mount/nfsmount.c

   1 /*
   2  * nfsmount.c -- Linux NFS mount
   3  * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2, or (at your option)
   8  * any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * Wed Feb  8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port
  16  * numbers to be specified on the command line.
  17  *
  18  * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>:
  19  * Omit the call to connect() for Linux version 1.3.11 or later.
  20  *
  21  * Wed Oct  1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com>
  22  * Implemented the "bg", "fg" and "retry" mount options for NFS.
  23  *
  24  * 1999-02-22 Arkadiusz Miskiewicz <misiek@pld.ORG.PL>
  25  * - added Native Language Support
  26  *
  27  * Modified by Olaf Kirch and Trond Myklebust for new NFS code,
  28  * plus NFSv3 stuff.
  29  *
  30  * 2006-06-06 Amit Gud <agud@redhat.com>
  31  * - Moved with modifcations to nfs-utils/utils/mount from util-linux/mount.
  32  */
  33
  34 /*
  35  * nfsmount.c,v 1.1.1.1 1993/11/18 08:40:51 jrs Exp
  36  */
  37
  38 #ifdef HAVE_CONFIG_H
  39 #include <config.h>
  40 #endif
  41
  42 #include <ctype.h>
  43 #include <unistd.h>
  44 #include <stdio.h>
  45 #include <string.h>
  46 #include <stdlib.h>
  47 #include <errno.h>
  48 #include <netdb.h>
  49 #include <time.h>
  50 #include <rpc/rpc.h>
  51 #include <rpc/pmap_prot.h>
  52 #include <rpc/pmap_clnt.h>
  53 #include <sys/socket.h>
  54 #include <sys/time.h>
  55 #include <sys/stat.h>
  56 #include <netinet/in.h>
  57 #include <arpa/inet.h>
  58 #include <mntent.h>
  59 #include <sys/mount.h>
  60 #include <paths.h>
  61 #include <syslog.h>
  62
  63 #include "xcommon.h"
  64 #include "mount.h"
  65 #include "nfs_mount.h"
  66 #include "mount_constants.h"
  67 #include "nls.h"
  68 #include "error.h"
  69 #include "network.h"
  70 #include "version.h"
  71
  72 #ifdef HAVE_RPCSVC_NFS_PROT_H
  73 #include <rpcsvc/nfs_prot.h>
  74 #else
  75 #include <linux/nfs.h>
  76 #define nfsstat nfs_stat
  77 #endif
  78
  79 #ifndef NFS_PORT
  80 #define NFS_PORT 2049
  81 #endif
  82 #ifndef NFS_FHSIZE
  83 #define NFS_FHSIZE 32
  84 #endif
  85
  86 #ifndef HAVE_INET_ATON
  87 #define inet_aton(a,b) (0)
  88 #endif
  89
  90 typedef dirpath mnt2arg_t;
  91 typedef dirpath mnt3arg_t;
  92 typedef dirpath mntarg_t;
  93
  94 typedef struct fhstatus  mnt2res_t;
  95 typedef struct mountres3 mnt3res_t;
  96 typedef union {
  97         mnt2res_t nfsv2;
  98         mnt3res_t nfsv3;
  99 } mntres_t;
 100
 101 extern int nfs_mount_data_version;
 102 extern char *progname;
 103 extern int verbose;
 104 extern int sloppy;
 105
 106 static inline enum clnt_stat
 107 nfs3_mount(CLIENT *clnt, mnt3arg_t *mnt3arg, mnt3res_t *mnt3res)
 108 {
 109         return clnt_call(clnt, MOUNTPROC3_MNT,
 110                          (xdrproc_t) xdr_dirpath, (caddr_t) mnt3arg,
 111                          (xdrproc_t) xdr_mountres3, (caddr_t) mnt3res,
 112                          TIMEOUT);
 113 }
 114
 115 static inline enum clnt_stat
 116 nfs2_mount(CLIENT *clnt, mnt2arg_t *mnt2arg, mnt2res_t *mnt2res)
 117 {
 118         return clnt_call(clnt, MOUNTPROC_MNT,
 119                          (xdrproc_t) xdr_dirpath, (caddr_t) mnt2arg,
 120                          (xdrproc_t) xdr_fhstatus, (caddr_t) mnt2res,
 121                          TIMEOUT);
 122 }
 123
 124 static int
 125 nfs_call_mount(clnt_addr_t *mnt_server, clnt_addr_t *nfs_server,
 126                mntarg_t *mntarg, mntres_t *mntres)
 127 {
 128         CLIENT *clnt;
 129         enum clnt_stat stat;
 130         int msock;
 131
 132         if (!probe_bothports(mnt_server, nfs_server))
 133                 goto out_bad;
 134
 135         clnt = mnt_openclnt(mnt_server, &msock);
 136         if (!clnt)
 137                 goto out_bad;
 138         /* make pointers in xdr_mountres3 NULL so
 139          * that xdr_array allocates memory for us
 140          */
 141         memset(mntres, 0, sizeof(*mntres));
 142         switch (mnt_server->pmap.pm_vers) {
 143         case 3:
 144                 stat = nfs3_mount(clnt, mntarg, &mntres->nfsv3);
 145                 break;
 146         case 2:
 147         case 1:
 148                 stat = nfs2_mount(clnt, mntarg, &mntres->nfsv2);
 149                 break;
 150         default:
 151                 goto out_bad;
 152         }
 153         if (stat != RPC_SUCCESS) {
 154                 clnt_geterr(clnt, &rpc_createerr.cf_error);
 155                 rpc_createerr.cf_stat = stat;
 156         }
 157         mnt_closeclnt(clnt, msock);
 158         if (stat == RPC_SUCCESS)
 159                 return 1;
 160  out_bad:
 161         return 0;
 162 }
 163
 164 static int
 165 parse_options(char *old_opts, struct nfs_mount_data *data,
 166               int *bg, int *retry, clnt_addr_t *mnt_server,
 167               clnt_addr_t *nfs_server, char *new_opts, const int opt_size)
 168 {
 169         struct sockaddr_in *mnt_saddr = &mnt_server->saddr;
 170         struct pmap *mnt_pmap = &mnt_server->pmap;
 171         struct pmap *nfs_pmap = &nfs_server->pmap;
 172         int len;
 173         char *opt, *opteq, *p, *opt_b, *tmp_opts;
 174         char *mounthost = NULL;
 175         char cbuf[128];
 176         int open_quote = 0;
 177
 178         data->flags = 0;
 179         *bg = 0;
 180
 181         len = strlen(new_opts);
 182         tmp_opts = xstrdup(old_opts);
 183         for (p=tmp_opts, opt_b=NULL; p && *p; p++) {
 184                 if (!opt_b)
 185                         opt_b = p;              /* begin of the option item */
 186                 if (*p == '"')
 187                         open_quote ^= 1;        /* reverse the status */
 188                 if (open_quote)
 189                         continue;               /* still in a quoted block */
 190                 if (*p == ',')
 191                         *p = '\0';              /* terminate the option item */
 192                 if (*p == '\0' || *(p+1) == '\0') {
 193                         opt = opt_b;            /* opt is useful now */
 194                         opt_b = NULL;
 195                 }
 196                 else
 197                         continue;               /* still somewhere in the option item */
 198
 199                 if (strlen(opt) >= sizeof(cbuf))
 200                         goto bad_parameter;
 201                 if ((opteq = strchr(opt, '=')) && isdigit(opteq[1])) {
 202                         int val = atoi(opteq + 1);
 203                         *opteq = '\0';
 204                         if (!strcmp(opt, "rsize"))
 205                                 data->rsize = val;
 206                         else if (!strcmp(opt, "wsize"))
 207                                 data->wsize = val;
 208                         else if (!strcmp(opt, "timeo"))
 209                                 data->timeo = val;
 210                         else if (!strcmp(opt, "retrans"))
 211                                 data->retrans = val;
 212                         else if (!strcmp(opt, "acregmin"))
 213                                 data->acregmin = val;
 214                         else if (!strcmp(opt, "acregmax"))
 215                                 data->acregmax = val;
 216                         else if (!strcmp(opt, "acdirmin"))
 217                                 data->acdirmin = val;
 218                         else if (!strcmp(opt, "acdirmax"))
 219                                 data->acdirmax = val;
 220                         else if (!strcmp(opt, "actimeo")) {
 221                                 data->acregmin = val;
 222                                 data->acregmax = val;
 223                                 data->acdirmin = val;
 224                                 data->acdirmax = val;
 225                         }
 226                         else if (!strcmp(opt, "retry"))
 227                                 *retry = val;
 228                         else if (!strcmp(opt, "port"))
 229                                 nfs_pmap->pm_port = val;
 230                         else if (!strcmp(opt, "mountport"))
 231                                 mnt_pmap->pm_port = val;
 232                         else if (!strcmp(opt, "mountprog"))
 233                                 mnt_pmap->pm_prog = val;
 234                         else if (!strcmp(opt, "mountvers"))
 235                                 mnt_pmap->pm_vers = val;
 236                         else if (!strcmp(opt, "mounthost"))
 237                                 mounthost=xstrndup(opteq+1, strcspn(opteq+1," \t\n\r,"));
 238                         else if (!strcmp(opt, "nfsprog"))
 239                                 nfs_pmap->pm_prog = val;
 240                         else if (!strcmp(opt, "nfsvers") ||
 241                                  !strcmp(opt, "vers")) {
 242                                 nfs_pmap->pm_vers = val;
 243                                 opt = "nfsvers";
 244 #if NFS_MOUNT_VERSION >= 2
 245                         } else if (!strcmp(opt, "namlen")) {
 246                                 if (nfs_mount_data_version >= 2)
 247                                         data->namlen = val;
 248                                 else if (sloppy)
 249                                         continue;
 250                                 else
 251                                         goto bad_parameter;
 252 #endif
 253                         } else if (!strcmp(opt, "addr")) {
 254                                 /* ignore */;
 255                                 continue;
 256                         } else if (sloppy)
 257                                 continue;
 258                         else
 259                                 goto bad_parameter;
 260                         sprintf(cbuf, "%s=%s,", opt, opteq+1);
 261                 } else if (opteq) {
 262                         *opteq = '\0';
 263                         if (!strcmp(opt, "proto")) {
 264                                 if (!strcmp(opteq+1, "udp")) {
 265                                         nfs_pmap->pm_prot = IPPROTO_UDP;
 266                                         mnt_pmap->pm_prot = IPPROTO_UDP;
 267 #if NFS_MOUNT_VERSION >= 2
 268                                         data->flags &= ~NFS_MOUNT_TCP;
 269                                 } else if (!strcmp(opteq+1, "tcp") &&
 270                                            nfs_mount_data_version > 2) {
 271                                         nfs_pmap->pm_prot = IPPROTO_TCP;
 272                                         mnt_pmap->pm_prot = IPPROTO_TCP;
 273                                         data->flags |= NFS_MOUNT_TCP;
 274 #endif
 275                                 } else if (sloppy)
 276                                         continue;
 277                                 else
 278                                         goto bad_parameter;
 279 #if NFS_MOUNT_VERSION >= 5
 280                         } else if (!strcmp(opt, "sec")) {
 281                                 char *secflavor = opteq+1;
 282                                 /* see RFC 2623 */
 283                                 if (nfs_mount_data_version < 5) {
 284                                         printf(_("Warning: ignoring sec=%s option\n"),
 285                                                         secflavor);
 286                                         continue;
 287                                 } else if (!strcmp(secflavor, "none"))
 288                                         data->pseudoflavor = AUTH_NONE;
 289                                 else if (!strcmp(secflavor, "sys"))
 290                                         data->pseudoflavor = AUTH_SYS;
 291                                 else if (!strcmp(secflavor, "krb5"))
 292                                         data->pseudoflavor = AUTH_GSS_KRB5;
 293                                 else if (!strcmp(secflavor, "krb5i"))
 294                                         data->pseudoflavor = AUTH_GSS_KRB5I;
 295                                 else if (!strcmp(secflavor, "krb5p"))
 296                                         data->pseudoflavor = AUTH_GSS_KRB5P;
 297                                 else if (sloppy)
 298                                         continue;
 299                                 else {
 300                                         printf(_("Warning: Unrecognized security flavor %s.\n"),
 301                                                 secflavor);
 302                                         goto bad_parameter;
 303                                 }
 304                                 data->flags |= NFS_MOUNT_SECFLAVOUR;
 305 #endif
 306                         } else if (!strcmp(opt, "mounthost"))
 307                                 mounthost=xstrndup(opteq+1,
 308                                                    strcspn(opteq+1," \t\n\r,"));
 309                          else if (!strcmp(opt, "context")) {
 310                                 char *context = opteq + 1;
 311                                 int ctxlen = strlen(context);
 312
 313                                 if (ctxlen > NFS_MAX_CONTEXT_LEN) {
 314                                         nfs_error(_("context parameter exceeds"
 315                                                         " limit of %d"),
 316                                                         NFS_MAX_CONTEXT_LEN);
 317                                         goto bad_parameter;
 318                                 }
 319                                 /* The context string is in the format of
 320                                  * "system_u:object_r:...".  We only want
 321                                  * the context str between the quotes.
 322                                  */
 323                                 if (*context == '"')
 324                                         strncpy(data->context, context+1,
 325                                                         ctxlen-2);
 326                                 else
 327                                         strncpy(data->context, context,
 328                                                         NFS_MAX_CONTEXT_LEN);
 329                         } else if (sloppy)
 330                                 continue;
 331                         else
 332                                 goto bad_parameter;
 333                         sprintf(cbuf, "%s=%s,", opt, opteq+1);
 334                 } else {
 335                         int val = 1;
 336                         if (!strncmp(opt, "no", 2)) {
 337                                 val = 0;
 338                                 opt += 2;
 339                         }
 340                         if (!strcmp(opt, "bg"))
 341                                 *bg = val;
 342                         else if (!strcmp(opt, "fg"))
 343                                 *bg = !val;
 344                         else if (!strcmp(opt, "soft")) {
 345                                 data->flags &= ~NFS_MOUNT_SOFT;
 346                                 if (val)
 347                                         data->flags |= NFS_MOUNT_SOFT;
 348                         } else if (!strcmp(opt, "hard")) {
 349                                 data->flags &= ~NFS_MOUNT_SOFT;
 350                                 if (!val)
 351                                         data->flags |= NFS_MOUNT_SOFT;
 352                         } else if (!strcmp(opt, "intr")) {
 353                                 data->flags &= ~NFS_MOUNT_INTR;
 354                                 if (val)
 355                                         data->flags |= NFS_MOUNT_INTR;
 356                         } else if (!strcmp(opt, "posix")) {
 357                                 data->flags &= ~NFS_MOUNT_POSIX;
 358                                 if (val)
 359                                         data->flags |= NFS_MOUNT_POSIX;
 360                         } else if (!strcmp(opt, "cto")) {
 361                                 data->flags &= ~NFS_MOUNT_NOCTO;
 362                                 if (!val)
 363                                         data->flags |= NFS_MOUNT_NOCTO;
 364                         } else if (!strcmp(opt, "ac")) {
 365                                 data->flags &= ~NFS_MOUNT_NOAC;
 366                                 if (!val)
 367                                         data->flags |= NFS_MOUNT_NOAC;
 368 #if NFS_MOUNT_VERSION >= 2
 369                         } else if (!strcmp(opt, "tcp")) {
 370                                 data->flags &= ~NFS_MOUNT_TCP;
 371                                 if (val) {
 372                                         if (nfs_mount_data_version < 2)
 373                                                 goto bad_option;
 374                                         nfs_pmap->pm_prot = IPPROTO_TCP;
 375                                         mnt_pmap->pm_prot = IPPROTO_TCP;
 376                                         data->flags |= NFS_MOUNT_TCP;
 377                                 } else {
 378                                         mnt_pmap->pm_prot = IPPROTO_UDP;
 379                                         nfs_pmap->pm_prot = IPPROTO_UDP;
 380                                 }
 381                         } else if (!strcmp(opt, "udp")) {
 382                                 data->flags &= ~NFS_MOUNT_TCP;
 383                                 if (!val) {
 384                                         if (nfs_mount_data_version < 2)
 385                                                 goto bad_option;
 386                                         nfs_pmap->pm_prot = IPPROTO_TCP;
 387                                         mnt_pmap->pm_prot = IPPROTO_TCP;
 388                                         data->flags |= NFS_MOUNT_TCP;
 389                                 } else {
 390                                         nfs_pmap->pm_prot = IPPROTO_UDP;
 391                                         mnt_pmap->pm_prot = IPPROTO_UDP;
 392                                 }
 393 #endif
 394 #if NFS_MOUNT_VERSION >= 3
 395                         } else if (!strcmp(opt, "lock")) {
 396                                 data->flags &= ~NFS_MOUNT_NONLM;
 397                                 if (!val) {
 398                                         if (nfs_mount_data_version < 3)
 399                                                 goto bad_option;
 400                                         data->flags |= NFS_MOUNT_NONLM;
 401                                 }
 402 #endif
 403 #if NFS_MOUNT_VERSION >= 4
 404                         } else if (!strcmp(opt, "broken_suid")) {
 405                                 data->flags &= ~NFS_MOUNT_BROKEN_SUID;
 406                                 if (val) {
 407                                         if (nfs_mount_data_version < 4)
 408                                                 goto bad_option;
 409                                         data->flags |= NFS_MOUNT_BROKEN_SUID;
 410                                 }
 411                         } else if (!strcmp(opt, "acl")) {
 412                                 data->flags &= ~NFS_MOUNT_NOACL;
 413                                 if (!val)
 414                                         data->flags |= NFS_MOUNT_NOACL;
 415                         } else if (!strcmp(opt, "rdirplus")) {
 416                                 data->flags &= ~NFS_MOUNT_NORDIRPLUS;
 417                                 if (!val)
 418                                         data->flags |= NFS_MOUNT_NORDIRPLUS;
 419                         } else if (!strcmp(opt, "sharecache")) {
 420                                 data->flags &= ~NFS_MOUNT_UNSHARED;
 421                                 if (!val)
 422                                         data->flags |= NFS_MOUNT_UNSHARED;
 423 #endif
 424                         } else {
 425                         bad_option:
 426                                 if (sloppy)
 427                                         continue;
 428                                 nfs_error(_("%s: Unsupported nfs mount option:"
 429                                                 " %s%s"), progname,
 430                                                 val ? "" : "no", opt);
 431                                 goto out_bad;
 432                         }
 433                         sprintf(cbuf, val ? "%s," : "no%s,", opt);
 434                 }
 435                 len += strlen(cbuf);
 436                 if (len >= opt_size) {
 437                         nfs_error(_("%s: excessively long option argument"),
 438                                         progname);
 439                         goto out_bad;
 440                 }
 441                 strcat(new_opts, cbuf);
 442         }
 443         /* See if the nfs host = mount host. */
 444         if (mounthost) {
 445                 if (!nfs_gethostbyname(mounthost, mnt_saddr))
 446                         goto out_bad;
 447                 *mnt_server->hostname = mounthost;
 448         }
 449         free(tmp_opts);
 450         return 1;
 451  bad_parameter:
 452         nfs_error(_("%s: Bad nfs mount parameter: %s\n"), progname, opt);
 453  out_bad:
 454         free(tmp_opts);
 455         return 0;
 456 }
 457
 458 static int nfsmnt_check_compat(const struct pmap *nfs_pmap,
 459                                 const struct pmap *mnt_pmap)
 460 {
 461         unsigned int max_nfs_vers = (nfs_mount_data_version >= 4) ? 3 : 2;
 462         unsigned int max_mnt_vers = (nfs_mount_data_version >= 4) ? 3 : 2;
 463
 464         if (nfs_pmap->pm_vers == 4) {
 465                 nfs_error(_("%s: Please use '-t nfs4' "
 466                                 "instead of '-o vers=4'"), progname);
 467                 goto out_bad;
 468         }
 469
 470         if (nfs_pmap->pm_vers) {
 471                 if (nfs_pmap->pm_vers > max_nfs_vers || nfs_pmap->pm_vers < 2) {
 472                         nfs_error(_("%s: NFS version %ld is not supported"),
 473                                         progname, nfs_pmap->pm_vers);
 474                         goto out_bad;
 475                 }
 476         }
 477
 478         if (mnt_pmap->pm_vers > max_mnt_vers) {
 479                 nfs_error(_("%s: NFS mount version %ld is not supported"),
 480                                 progname, mnt_pmap->pm_vers);
 481                 goto out_bad;
 482         }
 483
 484         return 1;
 485
 486 out_bad:
 487         return 0;
 488 }
 489
 490 int
 491 nfsmount(const char *spec, const char *node, int flags,
 492          char **extra_opts, int fake, int running_bg)
 493 {
 494         char hostdir[1024];
 495         char *hostname, *dirname, *old_opts, *mounthost = NULL;
 496         char new_opts[1024], cbuf[1024];
 497         static struct nfs_mount_data data;
 498         int val;
 499         static int doonce = 0;
 500
 501         clnt_addr_t mnt_server = {
 502                 .hostname = &mounthost
 503         };
 504         clnt_addr_t nfs_server = {
 505                 .hostname = &hostname
 506         };
 507         struct sockaddr_in *nfs_saddr = &nfs_server.saddr;
 508         struct pmap  *mnt_pmap = &mnt_server.pmap,
 509                      *nfs_pmap = &nfs_server.pmap;
 510         struct pmap  save_mnt, save_nfs;
 511
 512         int fsock = -1;
 513
 514         mntres_t mntres;
 515
 516         struct stat statbuf;
 517         char *s;
 518         int bg, retry;
 519         int retval = EX_FAIL;
 520         time_t t;
 521         time_t prevt;
 522         time_t timeout;
 523
 524         if (strlen(spec) >= sizeof(hostdir)) {
 525                 nfs_error(_("%s: excessively long host:dir argument"),
 526                                 progname);
 527                 goto fail;
 528         }
 529         strcpy(hostdir, spec);
 530         if ((s = strchr(hostdir, ':'))) {
 531                 hostname = hostdir;
 532                 dirname = s + 1;
 533                 *s = '\0';
 534                 /* Ignore all but first hostname in replicated mounts
 535                    until they can be fully supported. (mack@sgi.com) */
 536                 if ((s = strchr(hostdir, ','))) {
 537                         *s = '\0';
 538                         nfs_error(_("%s: warning: "
 539                                   "multiple hostnames not supported"),
 540                                         progname);
 541                 }
 542         } else {
 543                 nfs_error(_("%s: directory to mount not in host:dir format"),
 544                                 progname);
 545                 goto fail;
 546         }
 547
 548         if (!nfs_gethostbyname(hostname, nfs_saddr))
 549                 goto fail;
 550         mounthost = hostname;
 551         memcpy (&mnt_server.saddr, nfs_saddr, sizeof (mnt_server.saddr));
 552
 553         /* add IP address to mtab options for use when unmounting */
 554
 555         s = inet_ntoa(nfs_saddr->sin_addr);
 556         old_opts = *extra_opts;
 557         if (!old_opts)
 558                 old_opts = "";
 559
 560         /* Set default options.
 561          * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
 562          * let the kernel decide.
 563          * timeo is filled in after we know whether it'll be TCP or UDP. */
 564         memset(&data, 0, sizeof(data));
 565         data.acregmin   = 3;
 566         data.acregmax   = 60;
 567         data.acdirmin   = 30;
 568         data.acdirmax   = 60;
 569 #if NFS_MOUNT_VERSION >= 2
 570         data.namlen     = NAME_MAX;
 571 #endif
 572
 573         bg = 0;
 574         retry = -1;
 575
 576         memset(mnt_pmap, 0, sizeof(*mnt_pmap));
 577         mnt_pmap->pm_prog = MOUNTPROG;
 578         memset(nfs_pmap, 0, sizeof(*nfs_pmap));
 579         nfs_pmap->pm_prog = NFS_PROGRAM;
 580
 581         /* parse options */
 582         new_opts[0] = 0;
 583         if (!parse_options(old_opts, &data, &bg, &retry, &mnt_server, &nfs_server,
 584                            new_opts, sizeof(new_opts)))
 585                 goto fail;
 586         if (!nfsmnt_check_compat(nfs_pmap, mnt_pmap))
 587                 goto fail;
 588
 589         if (retry == -1) {
 590                 if (bg)
 591                         retry = 10000;  /* 10000 mins == ~1 week*/
 592                 else
 593                         retry = 2;      /* 2 min default on fg mounts */
 594         }
 595
 596 #ifdef NFS_MOUNT_DEBUG
 597         printf(_("rsize = %d, wsize = %d, timeo = %d, retrans = %d\n"),
 598                data.rsize, data.wsize, data.timeo, data.retrans);
 599         printf(_("acreg (min, max) = (%d, %d), acdir (min, max) = (%d, %d)\n"),
 600                data.acregmin, data.acregmax, data.acdirmin, data.acdirmax);
 601         printf(_("port = %lu, bg = %d, retry = %d, flags = %.8x\n"),
 602                nfs_pmap->pm_port, bg, retry, data.flags);
 603         printf(_("mountprog = %lu, mountvers = %lu, nfsprog = %lu, nfsvers = %lu\n"),
 604                mnt_pmap->pm_prog, mnt_pmap->pm_vers,
 605                nfs_pmap->pm_prog, nfs_pmap->pm_vers);
 606         printf(_("soft = %d, intr = %d, posix = %d, nocto = %d, noac = %d"),
 607                (data.flags & NFS_MOUNT_SOFT) != 0,
 608                (data.flags & NFS_MOUNT_INTR) != 0,
 609                (data.flags & NFS_MOUNT_POSIX) != 0,
 610                (data.flags & NFS_MOUNT_NOCTO) != 0,
 611                (data.flags & NFS_MOUNT_NOAC) != 0);
 612 #if NFS_MOUNT_VERSION >= 2
 613         printf(_(", tcp = %d"),
 614                (data.flags & NFS_MOUNT_TCP) != 0);
 615 #endif
 616 #if NFS_MOUNT_VERSION >= 4
 617         printf(_(", noacl = %d"), (data.flags & NFS_MOUNT_NOACL) != 0);
 618 #endif
 619 #if NFS_MOUNT_VERSION >= 5
 620         printf(_(", sec = %u"), data.pseudoflavor);
 621         printf(_(", readdirplus = %d"), (data.flags & NFS_MOUNT_NORDIRPLUS) != 0);
 622 #endif
 623         printf("\n");
 624 #endif
 625
 626         data.version = nfs_mount_data_version;
 627
 628         if (flags & MS_REMOUNT)
 629                 goto out_ok;
 630
 631         /* create mount deamon client */
 632
 633         /*
 634          * The following loop implements the mount retries. On the first
 635          * call, "running_bg" is 0. When the mount times out, and the
 636          * "bg" option is set, the exit status EX_BG will be returned.
 637          * For a backgrounded mount, there will be a second call by the
 638          * child process with "running_bg" set to 1.
 639          *
 640          * The case where the mount point is not present and the "bg"
 641          * option is set, is treated as a timeout. This is done to
 642          * support nested mounts.
 643          *
 644          * The "retry" count specified by the user is the number of
 645          * minutes to retry before giving up.
 646          *
 647          * Only the first error message will be displayed.
 648          */
 649         timeout = time(NULL) + 60 * retry;
 650         prevt = 0;
 651         t = 30;
 652         val = 1;
 653
 654         memcpy(&save_nfs, nfs_pmap, sizeof(save_nfs));
 655         memcpy(&save_mnt, mnt_pmap, sizeof(save_mnt));
 656         for (;;) {
 657                 if (bg && stat(node, &statbuf) == -1) {
 658                         /* no mount point yet - sleep */
 659                         if (running_bg) {
 660                                 sleep(val);     /* 1, 2, 4, 8, 16, 30, ... */
 661                                 val *= 2;
 662                                 if (val > 30)
 663                                         val = 30;
 664                         }
 665                 } else {
 666                         int stat;
 667                         /* be careful not to use too many CPU cycles */
 668                         if (t - prevt < 30)
 669                                 sleep(30);
 670
 671                         stat = nfs_call_mount(&mnt_server, &nfs_server,
 672                                               &dirname, &mntres);
 673                         if (stat)
 674                                 break;
 675                         memcpy(nfs_pmap, &save_nfs, sizeof(*nfs_pmap));
 676                         memcpy(mnt_pmap, &save_mnt, sizeof(*mnt_pmap));
 677                         prevt = t;
 678                 }
 679                 if (!bg) {
 680                         switch(rpc_createerr.cf_stat){
 681                         case RPC_TIMEDOUT:
 682                                 break;
 683                         case RPC_SYSTEMERROR:
 684                                 if (errno == ETIMEDOUT)
 685                                         break;
 686                         default:
 687                                 rpc_mount_errors(*nfs_server.hostname, 0, bg);
 688                         goto fail;
 689                         }
 690                         t = time(NULL);
 691                         if (t >= timeout) {
 692                                 rpc_mount_errors(*nfs_server.hostname, 0, bg);
 693                                 goto fail;
 694                         }
 695                         rpc_mount_errors(*nfs_server.hostname, 1, bg);
 696                         continue;
 697                 }
 698                 if (!running_bg) {
 699                         if (retry > 0)
 700                                 retval = EX_BG;
 701                         goto fail;
 702                 }
 703                 t = time(NULL);
 704                 if (t >= timeout) {
 705                         rpc_mount_errors(*nfs_server.hostname, 0, bg);
 706                         goto fail;
 707                 }
 708                 if (doonce++ < 1)
 709                         rpc_mount_errors(*nfs_server.hostname, 1, bg);
 710         }
 711
 712         if (mnt_pmap->pm_vers <= 2) {
 713                 if (mntres.nfsv2.fhs_status != 0) {
 714                         nfs_error(_("%s: %s:%s failed, reason given by server: %s"),
 715                                         progname, hostname, dirname,
 716                                         nfs_strerror(mntres.nfsv2.fhs_status));
 717                         goto fail;
 718                 }
 719                 memcpy(data.root.data,
 720                        (char *) mntres.nfsv2.fhstatus_u.fhs_fhandle,
 721                        NFS_FHSIZE);
 722 #if NFS_MOUNT_VERSION >= 4
 723                 data.root.size = NFS_FHSIZE;
 724                 memcpy(data.old_root.data,
 725                        (char *) mntres.nfsv2.fhstatus_u.fhs_fhandle,
 726                        NFS_FHSIZE);
 727 #endif
 728         } else {
 729 #if NFS_MOUNT_VERSION >= 4
 730                 mountres3_ok *mountres;
 731                 fhandle3 *fhandle;
 732                 int i,  n_flavors, *flavor, yum = 0;
 733                 if (mntres.nfsv3.fhs_status != 0) {
 734                         nfs_error(_("%s: %s:%s failed, reason given by server: %s"),
 735                                         progname, hostname, dirname,
 736                                         nfs_strerror(mntres.nfsv3.fhs_status));
 737                         goto fail;
 738                 }
 739 #if NFS_MOUNT_VERSION >= 5
 740                 mountres = &mntres.nfsv3.mountres3_u.mountinfo;
 741                 n_flavors = mountres->auth_flavors.auth_flavors_len;
 742                 if (n_flavors <= 0)
 743                         goto noauth_flavors;
 744
 745                 flavor = mountres->auth_flavors.auth_flavors_val;
 746                 for (i = 0; i < n_flavors; ++i) {
 747                         /*
 748                          * Per RFC2623, section 2.7, we should prefer the
 749                          * flavour listed first.
 750                          * If no flavour requested, use the first simple
 751                          * flavour that is offered.
 752                          */
 753                         if (! (data.flags & NFS_MOUNT_SECFLAVOUR) &&
 754                             (flavor[i] == AUTH_SYS ||
 755                              flavor[i] == AUTH_NONE)) {
 756                                 data.pseudoflavor = flavor[i];
 757                                 data.flags |= NFS_MOUNT_SECFLAVOUR;
 758                         }
 759                         if (flavor[i] == data.pseudoflavor)
 760                                 yum = 1;
 761 #ifdef NFS_MOUNT_DEBUG
 762                         printf(_("auth flavor %d: %d\n"), i, flavor[i]);
 763 #endif
 764                 }
 765                 if (!yum) {
 766                         nfs_error(_("%s: %s:%s failed, security flavor "
 767                                         "not supported"),
 768                                         progname, hostname, dirname);
 769                         /* server has registered us in rmtab, send umount */
 770                         nfs_call_umount(&mnt_server, &dirname);
 771                         goto fail;
 772                 }
 773 noauth_flavors:
 774 #endif
 775                 fhandle = &mntres.nfsv3.mountres3_u.mountinfo.fhandle;
 776                 memset(data.old_root.data, 0, NFS_FHSIZE);
 777                 memset(&data.root, 0, sizeof(data.root));
 778                 data.root.size = fhandle->fhandle3_len;
 779                 memcpy(data.root.data,
 780                        (char *) fhandle->fhandle3_val,
 781                        fhandle->fhandle3_len);
 782
 783                 data.flags |= NFS_MOUNT_VER3;
 784 #endif
 785         }
 786
 787         if (nfs_mount_data_version == 1) {
 788                 /* create nfs socket for kernel */
 789                 if (nfs_pmap->pm_prot == IPPROTO_TCP)
 790                         fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 791                 else
 792                         fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 793                 if (fsock < 0) {
 794                         perror(_("nfs socket"));
 795                         goto fail;
 796                 }
 797                 if (bindresvport(fsock, 0) < 0) {
 798                         perror(_("nfs bindresvport"));
 799                         goto fail;
 800                 }
 801         }
 802
 803 #ifdef NFS_MOUNT_DEBUG
 804         printf(_("using port %lu for nfs deamon\n"), nfs_pmap->pm_port);
 805 #endif
 806         nfs_saddr->sin_port = htons(nfs_pmap->pm_port);
 807         /*
 808          * connect() the socket for kernels 1.3.10 and below only,
 809          * to avoid problems with multihomed hosts.
 810          * --Swen
 811          */
 812         if (linux_version_code() <= MAKE_VERSION(1, 3, 10) && fsock != -1
 813             && connect(fsock, (struct sockaddr *) nfs_saddr,
 814                        sizeof (*nfs_saddr)) < 0) {
 815                 perror(_("nfs connect"));
 816                 goto fail;
 817         }
 818
 819 #if NFS_MOUNT_VERSION >= 2
 820         if (nfs_pmap->pm_prot == IPPROTO_TCP)
 821                 data.flags |= NFS_MOUNT_TCP;
 822         else
 823                 data.flags &= ~NFS_MOUNT_TCP;
 824 #endif
 825
 826         /* prepare data structure for kernel */
 827
 828         data.fd = fsock;
 829         memcpy((char *) &data.addr, (char *) nfs_saddr, sizeof(data.addr));
 830         strncpy(data.hostname, hostname, sizeof(data.hostname));
 831
 832  out_ok:
 833         /* Ensure we have enough padding for the following strcat()s */
 834         if (strlen(new_opts) + strlen(s) + 30 >= sizeof(new_opts)) {
 835                 nfs_error(_("%s: excessively long option argument"),
 836                                 progname);
 837                 goto fail;
 838         }
 839
 840         snprintf(cbuf, sizeof(cbuf)-1, "addr=%s", s);
 841         strcat(new_opts, cbuf);
 842
 843         *extra_opts = xstrdup(new_opts);
 844
 845         if (!fake && !(data.flags & NFS_MOUNT_NONLM)) {
 846                 if (!start_statd()) {
 847                         nfs_error(_("%s: rpc.statd is not running but is "
 848                                 "required for remote locking.\n"
 849                                 "   Either use '-o nolock' to keep "
 850                                 "locks local, or start statd."),
 851                                         progname);
 852                         goto fail;
 853                 }
 854         }
 855
 856         if (!fake) {
 857                 if (mount(spec, node, "nfs",
 858                                 flags & ~(MS_USER|MS_USERS), &data)) {
 859                         mount_error(spec, node, errno);
 860                         goto fail;
 861                 }
 862         }
 863
 864         return EX_SUCCESS;
 865
 866         /* abort */
 867  fail:
 868         if (fsock != -1)
 869                 close(fsock);
 870         return retval;
 871 }