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/utsname.h>
  52 #include <sys/stat.h>
  53 #include <netinet/in.h>
  54 #include <arpa/inet.h>
  55 #include <mntent.h>
  56 #include <sys/mount.h>
  57 #include <paths.h>
  58 #include <syslog.h>
  59
  60 #include "conn.h"
  61 #include "xcommon.h"
  62 #include "mount.h"
  63 #include "nfsumount.h"
  64 #include "nfs_mount.h"
  65 #include "mount_constants.h"
  66 #include "nls.h"
  67
  68 #ifdef HAVE_RPCSVC_NFS_PROT_H
  69 #include <rpcsvc/nfs_prot.h>
  70 #else
  71 #include <linux/nfs.h>
  72 #define nfsstat nfs_stat
  73 #endif
  74
  75 #ifndef NFS_PORT
  76 #define NFS_PORT 2049
  77 #endif
  78 #ifndef NFS_FHSIZE
  79 #define NFS_FHSIZE 32
  80 #endif
  81
  82 static char *nfs_strerror(int stat);
  83
  84 #define MAKE_VERSION(p,q,r)     (65536*(p) + 256*(q) + (r))
  85 #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2)
  86 #define MAX_MNTPROT ((nfs_mount_version >= 4) ? 3 : 2)
  87 #define HAVE_RELIABLE_TCP (nfs_mount_version >= 4)
  88
  89 #ifndef HAVE_INET_ATON
  90 #define inet_aton(a,b) (0)
  91 #endif
  92
  93 typedef dirpath mnt2arg_t;
  94 typedef dirpath mnt3arg_t;
  95 typedef dirpath mntarg_t;
  96
  97 typedef struct fhstatus  mnt2res_t;
  98 typedef struct mountres3 mnt3res_t;
  99 typedef union {
 100         mnt2res_t nfsv2;
 101         mnt3res_t nfsv3;
 102 } mntres_t;
 103
 104 static char errbuf[BUFSIZ];
 105 static char *erreob = &errbuf[BUFSIZ];
 106 extern int verbose;
 107
 108 /* Convert RPC errors into strings */
 109 int rpc_strerror(int);
 110 int rpc_strerror(int spos)
 111 {
 112         int cf_stat = rpc_createerr.cf_stat;
 113         int pos=0, cf_errno = rpc_createerr.cf_error.re_errno;
 114         char *ptr, *estr = clnt_sperrno(cf_stat);
 115         char *tmp;
 116
 117         if (estr) {
 118                 if ((ptr = index(estr, ':')))
 119                         estr = ++ptr;
 120
 121                 tmp = &errbuf[spos];
 122                 if (cf_stat == RPC_SYSTEMERROR)
 123                         pos = snprintf(tmp, (erreob - tmp),
 124                                 "System Error: %s", strerror(cf_errno));
 125                 else
 126                         pos = snprintf(tmp, (erreob - tmp), "RPC Error:%s", estr);
 127         }
 128         return (pos);
 129 }
 130 void mount_errors(char *, int, int);
 131 void mount_errors(char *server, int will_retry, int bg)
 132 {
 133         int pos = 0;
 134         char *tmp;
 135         static int onlyonce = 0;
 136
 137         tmp = &errbuf[pos];
 138         if (bg)
 139                 pos = snprintf(tmp, (erreob - tmp),
 140                         "mount to NFS server '%s' failed: ", server);
 141         else
 142                 pos = snprintf(tmp, (erreob - tmp),
 143                         "mount: mount to NFS server '%s' failed: ", server);
 144
 145         tmp = &errbuf[pos];
 146         if (rpc_createerr.cf_stat == RPC_TIMEDOUT) {
 147                 pos = snprintf(tmp, (erreob - tmp), "timed out %s",
 148                         will_retry ? "(retrying)" : "(giving up)");
 149         } else {
 150                 pos += rpc_strerror(pos);
 151                 tmp = &errbuf[pos];
 152                 if (bg) {
 153                         pos = snprintf(tmp, (erreob - tmp), " %s",
 154                                 will_retry ? "(retrying)" : "(giving up)");
 155                 }
 156         }
 157         if (bg) {
 158                 if (onlyonce++ < 1)
 159                         openlog("mount", LOG_CONS|LOG_PID, LOG_AUTH);
 160                 syslog(LOG_ERR, "%s.", errbuf);
 161         } else
 162                 fprintf(stderr, "%s.\n", errbuf);
 163 }
 164
 165 /* Define the order in which to probe for UDP/TCP services */
 166 enum plist {
 167         use_tcp = 0,
 168         udp_tcp,
 169         udp_only,
 170 };
 171 static const u_int *
 172 proto_probelist(enum plist list)
 173 {
 174         static const u_int probe_udp_tcp[] = { IPPROTO_UDP, IPPROTO_TCP, 0 };
 175         static const u_int probe_both[] = { IPPROTO_TCP, IPPROTO_UDP, 0 };
 176         static const u_int probe_udponly[] = { IPPROTO_UDP, 0 };
 177
 178         if (list == use_tcp)
 179                 return probe_both;
 180         if (list == udp_tcp)
 181                 return probe_udp_tcp;
 182         return probe_udponly;
 183 }
 184
 185 /* Define the order in which NFS versions are probed on portmapper */
 186 static const u_long *
 187 nfs_probelist(const int vers)
 188 {
 189         static const u_long nfs2_probe[] = { 2, 0};
 190         static const u_long nfs3_probe[] = { 3, 2, 0};
 191         switch (vers) {
 192         case 3:
 193                 return nfs3_probe;
 194         default:
 195                 return nfs2_probe;
 196         }
 197 }
 198
 199 /* Define the order in which Mountd versions are probed on portmapper */
 200 static const u_long *
 201 mnt_probelist(const int vers)
 202 {
 203         static const u_long mnt1_probe[] = { 1, 2, 0 };
 204         static const u_long mnt3_probe[] = { 3, 1, 2, 0 };
 205         switch (vers) {
 206         case 3:
 207                 return mnt3_probe;
 208         default:
 209                 return mnt1_probe;
 210         }
 211 }
 212
 213 static int
 214 linux_version_code(void) {
 215         struct utsname my_utsname;
 216         int p, q, r;
 217
 218         if (uname(&my_utsname) == 0) {
 219                 p = atoi(strtok(my_utsname.release, "."));
 220                 q = atoi(strtok(NULL, "."));
 221                 r = atoi(strtok(NULL, "."));
 222                 return MAKE_VERSION(p,q,r);
 223         }
 224         return 0;
 225 }
 226
 227 /*
 228  * Unfortunately, the kernel prints annoying console messages
 229  * in case of an unexpected nfs mount version (instead of
 230  * just returning some error).  Therefore we'll have to try
 231  * and figure out what version the kernel expects.
 232  *
 233  * Variables:
 234  *      NFS_MOUNT_VERSION: these nfsmount sources at compile time
 235  *      nfs_mount_version: version this source and running kernel can handle
 236  */
 237 int nfs_mount_version = NFS_MOUNT_VERSION;
 238
 239 int
 240 find_kernel_nfs_mount_version(void) {
 241         static int kernel_version = -1;
 242         int mnt_version = NFS_MOUNT_VERSION;
 243
 244         if (kernel_version == -1)
 245                 kernel_version = linux_version_code();
 246
 247         if (kernel_version) {
 248              if (kernel_version < MAKE_VERSION(2,1,32))
 249                   mnt_version = 1;
 250              else if (kernel_version < MAKE_VERSION(2,2,18))
 251                   mnt_version = 3;
 252              else if (kernel_version < MAKE_VERSION(2,3,0))
 253                   mnt_version = 4; /* since 2.2.18pre9 */
 254              else if (kernel_version < MAKE_VERSION(2,3,99))
 255                   mnt_version = 3;
 256              else if (kernel_version < MAKE_VERSION(2,6,3))
 257                   mnt_version = 4;
 258              else
 259                   mnt_version = 6;
 260         }
 261         if (mnt_version > NFS_MOUNT_VERSION)
 262              mnt_version = NFS_MOUNT_VERSION;
 263         return mnt_version;
 264 }
 265
 266 int nfs_gethostbyname(const char *, struct sockaddr_in *);
 267 int nfs_gethostbyname(const char *hostname, struct sockaddr_in *saddr)
 268 {
 269         struct hostent *hp;
 270
 271         saddr->sin_family = AF_INET;
 272         if (!inet_aton(hostname, &saddr->sin_addr)) {
 273                 if ((hp = gethostbyname(hostname)) == NULL) {
 274                         fprintf(stderr, _("mount: can't get address for %s\n"),
 275                                 hostname);
 276                         return 0;
 277                 } else {
 278                         if (hp->h_length > sizeof(*saddr)) {
 279                                 fprintf(stderr,
 280                                         _("mount: got bad hp->h_length\n"));
 281                                 hp->h_length = sizeof(*saddr);
 282                         }
 283                         memcpy(&saddr->sin_addr, hp->h_addr, hp->h_length);
 284                 }
 285         }
 286         return 1;
 287 }
 288
 289 /*
 290  * getport() is very similar to pmap_getport() with
 291  * the exception this version uses a non-reserve ports
 292  * instead of reserve ports since reserve ports
 293  * are not needed for pmap requests.
 294  */
 295 static u_short
 296 getport(
 297         struct sockaddr_in *saddr,
 298         u_long prog,
 299         u_long vers,
 300         u_int prot)
 301 {
 302         u_short port;
 303         int    socket;
 304         CLIENT *clnt = NULL;
 305         struct pmap parms;
 306         enum clnt_stat stat;
 307
 308         saddr->sin_port = htons (PMAPPORT);
 309         socket = get_socket(saddr, prot, FALSE);
 310
 311         switch (prot) {
 312         case IPPROTO_UDP:
 313                 clnt = clntudp_bufcreate(saddr,
 314                                          PMAPPROG, PMAPVERS, TIMEOUT, &socket,
 315                                          UDPMSGSIZE, UDPMSGSIZE);
 316                 break;
 317         case IPPROTO_TCP:
 318                 clnt = clnttcp_create(saddr,
 319                         PMAPPROG, PMAPVERS, &socket, 50, 500);
 320                 break;
 321         }
 322         if (clnt != NULL) {
 323                 parms.pm_prog = prog;
 324                 parms.pm_vers = vers;
 325                 parms.pm_prot = prot;
 326                 parms.pm_port = 0;    /* not needed or used */
 327
 328                 stat = clnt_call(clnt, PMAPPROC_GETPORT, (xdrproc_t)xdr_pmap,
 329                         (caddr_t)&parms, (xdrproc_t)xdr_u_short, (caddr_t)&port, TIMEOUT);
 330                 if (stat) {
 331                         clnt_geterr(clnt, &rpc_createerr.cf_error);
 332                         rpc_createerr.cf_stat = stat;
 333                 }
 334                 clnt_destroy(clnt);
 335                 if (stat != RPC_SUCCESS)
 336                         port = 0;
 337                 else if (port == 0)
 338                         rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
 339         }
 340         if (socket != 1)
 341                 close(socket);
 342
 343         return port;
 344 }
 345
 346 /*
 347  * Use the portmapper to discover whether or not the service we want is
 348  * available. The lists 'versions' and 'protos' define ordered sequences
 349  * of service versions and udp/tcp protocols to probe for.
 350  */
 351 static int
 352 probe_port(clnt_addr_t *server,
 353            const u_long *versions,
 354            const u_int *protos)
 355 {
 356         struct sockaddr_in *saddr = &server->saddr;
 357         struct pmap *pmap = &server->pmap;
 358         const u_long prog = pmap->pm_prog, *p_vers;
 359         const u_int prot = (u_int)pmap->pm_prot,
 360                 *p_prot;
 361         const u_short port = (u_short) pmap->pm_port;
 362         u_long vers = pmap->pm_vers;
 363         u_short p_port;
 364         p_prot = prot ? &prot : protos;
 365         p_vers = vers ? &vers : versions;
 366         rpc_createerr.cf_stat = 0;
 367         for (;;) {
 368                 saddr->sin_port = htons(PMAPPORT);
 369                 p_port = getport(saddr, prog, *p_vers, *p_prot);
 370                 if (p_port) {
 371                         if (!port || port == p_port) {
 372                                 saddr->sin_port = htons(p_port);
 373                                 if (verbose) {
 374                                         fprintf(stderr,
 375                                                 "mount: trying %s prog %ld vers %ld prot %s port %d\n",
 376                                                 inet_ntoa(saddr->sin_addr), prog, *p_vers,
 377                                                 *p_prot == IPPROTO_UDP ? "udp" : "tcp", p_port);
 378                                 }
 379                                 if (clnt_ping(saddr, prog, *p_vers, *p_prot, NULL))
 380                                         goto out_ok;
 381                                 if (rpc_createerr.cf_stat == RPC_TIMEDOUT)
 382                                         goto out_bad;
 383                         }
 384                 }
 385                 if (rpc_createerr.cf_stat != RPC_PROGNOTREGISTERED)
 386                         goto out_bad;
 387
 388                 if (!prot) {
 389                         if (*++p_prot)
 390                                 continue;
 391                         p_prot = protos;
 392                 }
 393                 if (vers == pmap->pm_vers) {
 394                         p_vers = versions;
 395                         vers = 0;
 396                 }
 397                 if (vers || !*++p_vers)
 398                         break;
 399         }
 400 out_bad:
 401         return 0;
 402
 403  out_ok:
 404         if (!vers)
 405                 pmap->pm_vers = *p_vers;
 406         if (!prot)
 407                 pmap->pm_prot = *p_prot;
 408         if (!port)
 409                 pmap->pm_port = p_port;
 410         rpc_createerr.cf_stat = 0;
 411         return 1;
 412 }
 413
 414 static int
 415 probe_nfsport(clnt_addr_t *nfs_server)
 416 {
 417         const struct pmap *pmap = &nfs_server->pmap;
 418         const u_long *probe_vers;
 419         const u_int *probe_prot;
 420
 421         if (pmap->pm_vers && pmap->pm_prot && pmap->pm_port)
 422                 return 1;
 423         probe_vers = nfs_probelist(MAX_NFSPROT);
 424         probe_prot = proto_probelist(HAVE_RELIABLE_TCP ? use_tcp : udp_only);
 425         return probe_port(nfs_server, probe_vers, probe_prot);
 426 }
 427
 428 int probe_mntport(clnt_addr_t *mnt_server)
 429 {
 430         const struct pmap *pmap = &mnt_server->pmap;
 431         const u_long *probe_vers;
 432         const u_int *probe_prot;
 433
 434         if (pmap->pm_vers && pmap->pm_prot && pmap->pm_port)
 435                 return 1;
 436         probe_vers = mnt_probelist(MAX_MNTPROT);
 437         probe_prot = proto_probelist(HAVE_RELIABLE_TCP ? udp_tcp : udp_only);
 438         return probe_port(mnt_server, probe_vers, probe_prot);
 439 }
 440
 441 static int
 442 probe_bothports(clnt_addr_t *mnt_server, clnt_addr_t *nfs_server)
 443 {
 444         struct pmap *nfs_pmap = &nfs_server->pmap;
 445         struct pmap *mnt_pmap = &mnt_server->pmap;
 446         struct pmap save_nfs, save_mnt;
 447         int res;
 448         const u_long *probe_vers;
 449
 450         if (mnt_pmap->pm_vers && !nfs_pmap->pm_vers)
 451                 nfs_pmap->pm_vers = mntvers_to_nfs(mnt_pmap->pm_vers);
 452         else if (nfs_pmap->pm_vers && !mnt_pmap->pm_vers)
 453                 mnt_pmap->pm_vers = nfsvers_to_mnt(nfs_pmap->pm_vers);
 454         if (nfs_pmap->pm_vers)
 455                 goto version_fixed;
 456         memcpy(&save_nfs, nfs_pmap, sizeof(save_nfs));
 457         memcpy(&save_mnt, mnt_pmap, sizeof(save_mnt));
 458         for (probe_vers = mnt_probelist(MAX_MNTPROT); *probe_vers; probe_vers++) {
 459                 nfs_pmap->pm_vers = mntvers_to_nfs(*probe_vers);
 460                 if ((res = probe_nfsport(nfs_server) != 0)) {
 461                         mnt_pmap->pm_vers = nfsvers_to_mnt(nfs_pmap->pm_vers);
 462                         if ((res = probe_mntport(mnt_server)) != 0)
 463                                 return 1;
 464                         memcpy(mnt_pmap, &save_mnt, sizeof(*mnt_pmap));
 465                 }
 466                 switch (rpc_createerr.cf_stat) {
 467                 case RPC_PROGVERSMISMATCH:
 468                 case RPC_PROGNOTREGISTERED:
 469                         break;
 470                 default:
 471                         goto out_bad;
 472                 }
 473                 memcpy(nfs_pmap, &save_nfs, sizeof(*nfs_pmap));
 474         }
 475  out_bad:
 476         return 0;
 477  version_fixed:
 478         if (!probe_nfsport(nfs_server))
 479                 goto out_bad;
 480         return probe_mntport(mnt_server);
 481 }
 482
 483 static inline enum clnt_stat
 484 nfs3_mount(CLIENT *clnt, mnt3arg_t *mnt3arg, mnt3res_t *mnt3res)
 485 {
 486         return clnt_call(clnt, MOUNTPROC3_MNT,
 487                          (xdrproc_t) xdr_dirpath, (caddr_t) mnt3arg,
 488                          (xdrproc_t) xdr_mountres3, (caddr_t) mnt3res,
 489                          TIMEOUT);
 490 }
 491
 492 static inline enum clnt_stat
 493 nfs2_mount(CLIENT *clnt, mnt2arg_t *mnt2arg, mnt2res_t *mnt2res)
 494 {
 495         return clnt_call(clnt, MOUNTPROC_MNT,
 496                          (xdrproc_t) xdr_dirpath, (caddr_t) mnt2arg,
 497                          (xdrproc_t) xdr_fhstatus, (caddr_t) mnt2res,
 498                          TIMEOUT);
 499 }
 500
 501 static int
 502 nfs_call_mount(clnt_addr_t *mnt_server, clnt_addr_t *nfs_server,
 503                mntarg_t *mntarg, mntres_t *mntres)
 504 {
 505         CLIENT *clnt;
 506         enum clnt_stat stat;
 507         int msock;
 508
 509         if (!probe_bothports(mnt_server, nfs_server))
 510                 goto out_bad;
 511
 512         clnt = mnt_openclnt(mnt_server, &msock);
 513         if (!clnt)
 514                 goto out_bad;
 515         /* make pointers in xdr_mountres3 NULL so
 516          * that xdr_array allocates memory for us
 517          */
 518         memset(mntres, 0, sizeof(*mntres));
 519         switch (mnt_server->pmap.pm_vers) {
 520         case 3:
 521                 stat = nfs3_mount(clnt, mntarg, &mntres->nfsv3);
 522                 break;
 523         case 2:
 524         case 1:
 525                 stat = nfs2_mount(clnt, mntarg, &mntres->nfsv2);
 526                 break;
 527         default:
 528                 goto out_bad;
 529         }
 530         if (stat != RPC_SUCCESS) {
 531                 clnt_geterr(clnt, &rpc_createerr.cf_error);
 532                 rpc_createerr.cf_stat = stat;
 533         }
 534         mnt_closeclnt(clnt, msock);
 535         if (stat == RPC_SUCCESS)
 536                 return 1;
 537  out_bad:
 538         return 0;
 539 }
 540
 541 static int
 542 parse_options(char *old_opts, struct nfs_mount_data *data,
 543               int *bg, int *retry, clnt_addr_t *mnt_server,
 544               clnt_addr_t *nfs_server, char *new_opts, const int opt_size)
 545 {
 546         struct sockaddr_in *mnt_saddr = &mnt_server->saddr;
 547         struct pmap *mnt_pmap = &mnt_server->pmap;
 548         struct pmap *nfs_pmap = &nfs_server->pmap;
 549         int len;
 550         char *opt, *opteq;
 551         char *mounthost = NULL;
 552         char cbuf[128];
 553
 554         data->flags = 0;
 555         *bg = 0;
 556
 557         len = strlen(new_opts);
 558         for (opt = strtok(old_opts, ","); opt; opt = strtok(NULL, ",")) {
 559                 if (strlen(opt) >= sizeof(cbuf))
 560                         goto bad_parameter;
 561                 if ((opteq = strchr(opt, '=')) && isdigit(opteq[1])) {
 562                         int val = atoi(opteq + 1);
 563                         *opteq = '\0';
 564 /* printf("opt=%s\n", opt); */
 565                         if (!strcmp(opt, "rsize"))
 566                                 data->rsize = val;
 567                         else if (!strcmp(opt, "wsize"))
 568                                 data->wsize = val;
 569                         else if (!strcmp(opt, "timeo"))
 570                                 data->timeo = val;
 571                         else if (!strcmp(opt, "retrans"))
 572                                 data->retrans = val;
 573                         else if (!strcmp(opt, "acregmin"))
 574                                 data->acregmin = val;
 575                         else if (!strcmp(opt, "acregmax"))
 576                                 data->acregmax = val;
 577                         else if (!strcmp(opt, "acdirmin"))
 578                                 data->acdirmin = val;
 579                         else if (!strcmp(opt, "acdirmax"))
 580                                 data->acdirmax = val;
 581                         else if (!strcmp(opt, "actimeo")) {
 582                                 data->acregmin = val;
 583                                 data->acregmax = val;
 584                                 data->acdirmin = val;
 585                                 data->acdirmax = val;
 586                         }
 587                         else if (!strcmp(opt, "retry"))
 588                                 *retry = val;
 589                         else if (!strcmp(opt, "port"))
 590                                 nfs_pmap->pm_port = val;
 591                         else if (!strcmp(opt, "mountport"))
 592                                 mnt_pmap->pm_port = val;
 593                         else if (!strcmp(opt, "mountprog"))
 594                                 mnt_pmap->pm_prog = val;
 595                         else if (!strcmp(opt, "mountvers"))
 596                                 mnt_pmap->pm_vers = val;
 597                         else if (!strcmp(opt, "mounthost"))
 598                                 mounthost=xstrndup(opteq+1, strcspn(opteq+1," \t\n\r,"));
 599                         else if (!strcmp(opt, "nfsprog"))
 600                                 nfs_pmap->pm_prog = val;
 601                         else if (!strcmp(opt, "nfsvers") ||
 602                                  !strcmp(opt, "vers")) {
 603                                 nfs_pmap->pm_vers = val;
 604                                 opt = "nfsvers";
 605 #if NFS_MOUNT_VERSION >= 2
 606                         } else if (!strcmp(opt, "namlen")) {
 607                                 if (nfs_mount_version >= 2)
 608                                         data->namlen = val;
 609                                 else
 610                                         goto bad_parameter;
 611 #endif
 612                         } else if (!strcmp(opt, "addr")) {
 613                                 /* ignore */;
 614                                 continue;
 615                         } else
 616                                 goto bad_parameter;
 617                         sprintf(cbuf, "%s=%s,", opt, opteq+1);
 618                 } else if (opteq) {
 619                         *opteq = '\0';
 620                         if (!strcmp(opt, "proto")) {
 621                                 if (!strcmp(opteq+1, "udp")) {
 622                                         nfs_pmap->pm_prot = IPPROTO_UDP;
 623                                         mnt_pmap->pm_prot = IPPROTO_UDP;
 624 #if NFS_MOUNT_VERSION >= 2
 625                                         data->flags &= ~NFS_MOUNT_TCP;
 626                                 } else if (!strcmp(opteq+1, "tcp") &&
 627                                            nfs_mount_version > 2) {
 628                                         nfs_pmap->pm_prot = IPPROTO_TCP;
 629                                         mnt_pmap->pm_prot = IPPROTO_TCP;
 630                                         data->flags |= NFS_MOUNT_TCP;
 631 #endif
 632                                 } else
 633                                         goto bad_parameter;
 634 #if NFS_MOUNT_VERSION >= 5
 635                         } else if (!strcmp(opt, "sec")) {
 636                                 char *secflavor = opteq+1;
 637                                 /* see RFC 2623 */
 638                                 if (nfs_mount_version < 5) {
 639                                         printf(_("Warning: ignoring sec=%s option\n"), secflavor);
 640                                         continue;
 641                                 } else if (!strcmp(secflavor, "none"))
 642                                         data->pseudoflavor = AUTH_NONE;
 643                                 else if (!strcmp(secflavor, "sys"))
 644                                         data->pseudoflavor = AUTH_SYS;
 645                                 else if (!strcmp(secflavor, "krb5"))
 646                                         data->pseudoflavor = AUTH_GSS_KRB5;
 647                                 else if (!strcmp(secflavor, "krb5i"))
 648                                         data->pseudoflavor = AUTH_GSS_KRB5I;
 649                                 else if (!strcmp(secflavor, "krb5p"))
 650                                         data->pseudoflavor = AUTH_GSS_KRB5P;
 651                                 else if (!strcmp(secflavor, "lipkey"))
 652                                         data->pseudoflavor = AUTH_GSS_LKEY;
 653                                 else if (!strcmp(secflavor, "lipkey-i"))
 654                                         data->pseudoflavor = AUTH_GSS_LKEYI;
 655                                 else if (!strcmp(secflavor, "lipkey-p"))
 656                                         data->pseudoflavor = AUTH_GSS_LKEYP;
 657                                 else if (!strcmp(secflavor, "spkm3"))
 658                                         data->pseudoflavor = AUTH_GSS_SPKM;
 659                                 else if (!strcmp(secflavor, "spkm3i"))
 660                                         data->pseudoflavor = AUTH_GSS_SPKMI;
 661                                 else if (!strcmp(secflavor, "spkm3p"))
 662                                         data->pseudoflavor = AUTH_GSS_SPKMP;
 663                                 else {
 664                                         printf(_("Warning: Unrecognized security flavor %s.\n"),
 665                                                 secflavor);
 666                                         goto bad_parameter;
 667                                 }
 668                                 data->flags |= NFS_MOUNT_SECFLAVOUR;
 669 #endif
 670                         } else if (!strcmp(opt, "mounthost"))
 671                                 mounthost=xstrndup(opteq+1,
 672                                                    strcspn(opteq+1," \t\n\r,"));
 673                          else if (!strcmp(opt, "context")) {
 674                                 char *context = opteq + 1;
 675
 676                                 if (strlen(context) > NFS_MAX_CONTEXT_LEN) {
 677                                         printf(_("context parameter exceeds limit of %d\n"),
 678                                                  NFS_MAX_CONTEXT_LEN);
 679                                         goto bad_parameter;
 680                                 }
 681                                 strncpy(data->context, context, NFS_MAX_CONTEXT_LEN);
 682                         } else
 683                                 goto bad_parameter;
 684                         sprintf(cbuf, "%s=%s,", opt, opteq+1);
 685                 } else {
 686                         int val = 1;
 687                         if (!strncmp(opt, "no", 2)) {
 688                                 val = 0;
 689                                 opt += 2;
 690                         }
 691                         if (!strcmp(opt, "bg"))
 692                                 *bg = val;
 693                         else if (!strcmp(opt, "fg"))
 694                                 *bg = !val;
 695                         else if (!strcmp(opt, "soft")) {
 696                                 data->flags &= ~NFS_MOUNT_SOFT;
 697                                 if (val)
 698                                         data->flags |= NFS_MOUNT_SOFT;
 699                         } else if (!strcmp(opt, "hard")) {
 700                                 data->flags &= ~NFS_MOUNT_SOFT;
 701                                 if (!val)
 702                                         data->flags |= NFS_MOUNT_SOFT;
 703                         } else if (!strcmp(opt, "intr")) {
 704                                 data->flags &= ~NFS_MOUNT_INTR;
 705                                 if (val)
 706                                         data->flags |= NFS_MOUNT_INTR;
 707                         } else if (!strcmp(opt, "posix")) {
 708                                 data->flags &= ~NFS_MOUNT_POSIX;
 709                                 if (val)
 710                                         data->flags |= NFS_MOUNT_POSIX;
 711                         } else if (!strcmp(opt, "cto")) {
 712                                 data->flags &= ~NFS_MOUNT_NOCTO;
 713                                 if (!val)
 714                                         data->flags |= NFS_MOUNT_NOCTO;
 715                         } else if (!strcmp(opt, "ac")) {
 716                                 data->flags &= ~NFS_MOUNT_NOAC;
 717                                 if (!val)
 718                                         data->flags |= NFS_MOUNT_NOAC;
 719 #if NFS_MOUNT_VERSION >= 2
 720                         } else if (!strcmp(opt, "tcp")) {
 721                                 data->flags &= ~NFS_MOUNT_TCP;
 722                                 if (val) {
 723                                         if (nfs_mount_version < 2)
 724                                                 goto bad_option;
 725                                         nfs_pmap->pm_prot = IPPROTO_TCP;
 726                                         mnt_pmap->pm_prot = IPPROTO_TCP;
 727                                         data->flags |= NFS_MOUNT_TCP;
 728                                 } else {
 729                                         mnt_pmap->pm_prot = IPPROTO_UDP;
 730                                         nfs_pmap->pm_prot = IPPROTO_UDP;
 731                                 }
 732                         } else if (!strcmp(opt, "udp")) {
 733                                 data->flags &= ~NFS_MOUNT_TCP;
 734                                 if (!val) {
 735                                         if (nfs_mount_version < 2)
 736                                                 goto bad_option;
 737                                         nfs_pmap->pm_prot = IPPROTO_TCP;
 738                                         mnt_pmap->pm_prot = IPPROTO_TCP;
 739                                         data->flags |= NFS_MOUNT_TCP;
 740                                 } else {
 741                                         nfs_pmap->pm_prot = IPPROTO_UDP;
 742                                         mnt_pmap->pm_prot = IPPROTO_UDP;
 743                                 }
 744 #endif
 745 #if NFS_MOUNT_VERSION >= 3
 746                         } else if (!strcmp(opt, "lock")) {
 747                                 data->flags &= ~NFS_MOUNT_NONLM;
 748                                 if (!val) {
 749                                         if (nfs_mount_version < 3)
 750                                                 goto bad_option;
 751                                         data->flags |= NFS_MOUNT_NONLM;
 752                                 }
 753 #endif
 754 #if NFS_MOUNT_VERSION >= 4
 755                         } else if (!strcmp(opt, "broken_suid")) {
 756                                 data->flags &= ~NFS_MOUNT_BROKEN_SUID;
 757                                 if (val) {
 758                                         if (nfs_mount_version < 4)
 759                                                 goto bad_option;
 760                                         data->flags |= NFS_MOUNT_BROKEN_SUID;
 761                                 }
 762                         } else if (!strcmp(opt, "acl")) {
 763                                 data->flags &= ~NFS_MOUNT_NOACL;
 764                                 if (!val)
 765                                         data->flags |= NFS_MOUNT_NOACL;
 766 #endif
 767                         } else {
 768                         bad_option:
 769                                 printf(_("Unsupported nfs mount option: "
 770                                          "%s%s\n"), val ? "" : "no", opt);
 771                                 goto out_bad;
 772                         }
 773                         sprintf(cbuf, val ? "%s,":"no%s,", opt);
 774                 }
 775                 len += strlen(cbuf);
 776                 if (len >= opt_size) {
 777                         printf(_("mount: excessively long option argument\n"));
 778                         goto out_bad;
 779                 }
 780                 strcat(new_opts, cbuf);
 781         }
 782         /* See if the nfs host = mount host. */
 783         if (mounthost) {
 784                 if (!nfs_gethostbyname(mounthost, mnt_saddr))
 785                         goto out_bad;
 786                 *mnt_server->hostname = mounthost;
 787         }
 788         return 1;
 789  bad_parameter:
 790         printf(_("Bad nfs mount parameter: %s\n"), opt);
 791  out_bad:
 792         return 0;
 793 }
 794
 795 static inline int
 796 nfsmnt_check_compat(const struct pmap *nfs_pmap, const struct pmap *mnt_pmap)
 797 {
 798         if (nfs_pmap->pm_vers &&
 799                 (nfs_pmap->pm_vers > MAX_NFSPROT || nfs_pmap->pm_vers < 2)) {
 800                 if (nfs_pmap->pm_vers == 4)
 801                         fprintf(stderr, _("'vers=4' is not supported.  "
 802                                 "Use '-t nfs4' instead.\n"));
 803                 else
 804                         fprintf(stderr, _("NFS version %ld is not supported.\n"),
 805                                 nfs_pmap->pm_vers);
 806                 goto out_bad;
 807         }
 808         if (mnt_pmap->pm_vers > MAX_MNTPROT) {
 809                 fprintf(stderr, _("NFS mount version %ld s not supported.\n"),
 810                         mnt_pmap->pm_vers);
 811                 goto out_bad;
 812         }
 813         return 1;
 814  out_bad:
 815         return 0;
 816 }
 817
 818 int
 819 nfsmount(const char *spec, const char *node, int *flags,
 820          char **extra_opts, char **mount_opts, int *nfs_mount_vers,
 821          int running_bg)
 822 {
 823         static char *prev_bg_host;
 824         char hostdir[1024];
 825         char *hostname, *dirname, *old_opts, *mounthost = NULL;
 826         char new_opts[1024], cbuf[1024];
 827         static struct nfs_mount_data data;
 828         int val;
 829         static int doonce = 0;
 830
 831         clnt_addr_t mnt_server = { &mounthost, };
 832         clnt_addr_t nfs_server = { &hostname, };
 833         struct sockaddr_in *nfs_saddr = &nfs_server.saddr;
 834         struct pmap  *mnt_pmap = &mnt_server.pmap,
 835                      *nfs_pmap = &nfs_server.pmap;
 836         struct pmap  save_mnt, save_nfs;
 837
 838         int fsock;
 839
 840         mntres_t mntres;
 841
 842         struct stat statbuf;
 843         char *s;
 844         int bg, retry;
 845         int retval;
 846         time_t t;
 847         time_t prevt;
 848         time_t timeout;
 849
 850         /* The version to try is either specified or 0
 851            In case it is 0 we tell the caller what we tried */
 852         if (!*nfs_mount_vers)
 853                 *nfs_mount_vers = find_kernel_nfs_mount_version();
 854         nfs_mount_version = *nfs_mount_vers;
 855
 856         retval = EX_FAIL;
 857         fsock = -1;
 858         if (strlen(spec) >= sizeof(hostdir)) {
 859                 fprintf(stderr, _("mount: "
 860                                   "excessively long host:dir argument\n"));
 861                 goto fail;
 862         }
 863         strcpy(hostdir, spec);
 864         if ((s = strchr(hostdir, ':'))) {
 865                 hostname = hostdir;
 866                 dirname = s + 1;
 867                 *s = '\0';
 868                 /* Ignore all but first hostname in replicated mounts
 869                    until they can be fully supported. (mack@sgi.com) */
 870                 if ((s = strchr(hostdir, ','))) {
 871                         *s = '\0';
 872                         fprintf(stderr,
 873                                 _("mount: warning: "
 874                                   "multiple hostnames not supported\n"));
 875                 }
 876         } else {
 877                 fprintf(stderr,
 878                         _("mount: "
 879                           "directory to mount not in host:dir format\n"));
 880                 goto fail;
 881         }
 882
 883         if (!nfs_gethostbyname(hostname, nfs_saddr))
 884                 goto fail;
 885         mounthost = hostname;
 886         memcpy (&mnt_server.saddr, nfs_saddr, sizeof (mnt_server.saddr));
 887
 888         /* add IP address to mtab options for use when unmounting */
 889
 890         s = inet_ntoa(nfs_saddr->sin_addr);
 891         old_opts = *extra_opts;
 892         if (!old_opts)
 893                 old_opts = "";
 894
 895         /* Set default options.
 896          * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
 897          * let the kernel decide.
 898          * timeo is filled in after we know whether it'll be TCP or UDP. */
 899         memset(&data, 0, sizeof(data));
 900         data.acregmin   = 3;
 901         data.acregmax   = 60;
 902         data.acdirmin   = 30;
 903         data.acdirmax   = 60;
 904 #if NFS_MOUNT_VERSION >= 2
 905         data.namlen     = NAME_MAX;
 906 #endif
 907         data.pseudoflavor = AUTH_SYS;
 908
 909         bg = 0;
 910         retry = 10000;          /* 10000 minutes ~ 1 week */
 911
 912         memset(mnt_pmap, 0, sizeof(*mnt_pmap));
 913         mnt_pmap->pm_prog = MOUNTPROG;
 914         memset(nfs_pmap, 0, sizeof(*nfs_pmap));
 915         nfs_pmap->pm_prog = NFS_PROGRAM;
 916
 917         /* parse options */
 918         new_opts[0] = 0;
 919         if (!parse_options(old_opts, &data, &bg, &retry, &mnt_server, &nfs_server,
 920                            new_opts, sizeof(new_opts)))
 921                 goto fail;
 922         if (!nfsmnt_check_compat(nfs_pmap, mnt_pmap))
 923                 goto fail;
 924
 925         if (retry == 10000 && !bg)
 926                 retry = 2; /* reset for fg mounts */
 927
 928
 929 #ifdef NFS_MOUNT_DEBUG
 930         printf("rsize = %d, wsize = %d, timeo = %d, retrans = %d\n",
 931                data.rsize, data.wsize, data.timeo, data.retrans);
 932         printf("acreg (min, max) = (%d, %d), acdir (min, max) = (%d, %d)\n",
 933                data.acregmin, data.acregmax, data.acdirmin, data.acdirmax);
 934         printf("port = %d, bg = %d, retry = %d, flags = %.8x\n",
 935                nfs_pmap->pm_port, bg, retry, data.flags);
 936         printf("mountprog = %d, mountvers = %d, nfsprog = %d, nfsvers = %d\n",
 937                mnt_pmap->pm_prog, mnt_pmap->pm_vers,
 938                nfs_pmap->pm_prog, nfs_pmap->pm_vers);
 939         printf("soft = %d, intr = %d, posix = %d, nocto = %d, noac = %d ",
 940                (data.flags & NFS_MOUNT_SOFT) != 0,
 941                (data.flags & NFS_MOUNT_INTR) != 0,
 942                (data.flags & NFS_MOUNT_POSIX) != 0,
 943                (data.flags & NFS_MOUNT_NOCTO) != 0,
 944                (data.flags & NFS_MOUNT_NOAC) != 0);
 945 #if NFS_MOUNT_VERSION >= 2
 946         printf("tcp = %d ",
 947                (data.flags & NFS_MOUNT_TCP) != 0);
 948 #endif
 949 #if NFS_MOUNT_VERSION >= 4
 950         printf("noacl = %d ", (data.flags & NFS_MOUNT_NOACL) != 0);
 951 #endif
 952 #if NFS_MOUNT_VERSION >= 5
 953         printf("sec = %u ", data.pseudoflavor);
 954 #endif
 955         printf("\n");
 956 #endif
 957
 958         data.version = nfs_mount_version;
 959         *mount_opts = (char *) &data;
 960
 961         if (*flags & MS_REMOUNT)
 962                 goto out_ok;
 963
 964         /*
 965          * If the previous mount operation on the same host was
 966          * backgrounded, and the "bg" for this mount is also set,
 967          * give up immediately, to avoid the initial timeout.
 968          */
 969         if (bg && !running_bg &&
 970             prev_bg_host && strcmp(hostname, prev_bg_host) == 0) {
 971                 if (retry > 0)
 972                         retval = EX_BG;
 973                 return retval;
 974         }
 975
 976         /* create mount deamon client */
 977
 978         /*
 979          * The following loop implements the mount retries. On the first
 980          * call, "running_bg" is 0. When the mount times out, and the
 981          * "bg" option is set, the exit status EX_BG will be returned.
 982          * For a backgrounded mount, there will be a second call by the
 983          * child process with "running_bg" set to 1.
 984          *
 985          * The case where the mount point is not present and the "bg"
 986          * option is set, is treated as a timeout. This is done to
 987          * support nested mounts.
 988          *
 989          * The "retry" count specified by the user is the number of
 990          * minutes to retry before giving up.
 991          *
 992          * Only the first error message will be displayed.
 993          */
 994         timeout = time(NULL) + 60 * retry;
 995         prevt = 0;
 996         t = 30;
 997         val = 1;
 998
 999         memcpy(&save_nfs, nfs_pmap, sizeof(save_nfs));
1000         memcpy(&save_mnt, mnt_pmap, sizeof(save_mnt));
1001         for (;;) {
1002                 if (bg && stat(node, &statbuf) == -1) {
1003                         /* no mount point yet - sleep */
1004                         if (running_bg) {
1005                                 sleep(val);     /* 1, 2, 4, 8, 16, 30, ... */
1006                                 val *= 2;
1007                                 if (val > 30)
1008                                         val = 30;
1009                         }
1010                 } else {
1011                         int stat;
1012                         /* be careful not to use too many CPU cycles */
1013                         if (t - prevt < 30)
1014                                 sleep(30);
1015
1016                         stat = nfs_call_mount(&mnt_server, &nfs_server,
1017                                               &dirname, &mntres);
1018                         if (stat)
1019                                 break;
1020                         memcpy(nfs_pmap, &save_nfs, sizeof(*nfs_pmap));
1021                         memcpy(mnt_pmap, &save_mnt, sizeof(*mnt_pmap));
1022                         prevt = t;
1023                 }
1024                 if (!bg) {
1025                         switch(rpc_createerr.cf_stat){
1026                         case RPC_TIMEDOUT:
1027                                 break;
1028                         case RPC_SYSTEMERROR:
1029                                 if (errno == ETIMEDOUT)
1030                                         break;
1031                         default:
1032                                 mount_errors(*nfs_server.hostname, 0, bg);
1033                         goto fail;
1034                         }
1035                         t = time(NULL);
1036                         if (t >= timeout) {
1037                                 mount_errors(*nfs_server.hostname, 0, bg);
1038                                 goto fail;
1039                         }
1040                         mount_errors(*nfs_server.hostname, 1, bg);
1041                         continue;
1042                 }
1043                 if (!running_bg) {
1044                         prev_bg_host = xstrdup(hostname);
1045                         if (retry > 0)
1046                                 retval = EX_BG;
1047                         goto fail;
1048                 }
1049                 t = time(NULL);
1050                 if (t >= timeout) {
1051                         mount_errors(*nfs_server.hostname, 0, bg);
1052                         goto fail;
1053                 }
1054                 if (doonce++ < 1)
1055                         mount_errors(*nfs_server.hostname, 1, bg);
1056         }
1057
1058         if (nfs_pmap->pm_vers == 2) {
1059                 if (mntres.nfsv2.fhs_status != 0) {
1060                         fprintf(stderr,
1061                                 _("mount: %s:%s failed, reason given by server: %s\n"),
1062                                 hostname, dirname,
1063                                 nfs_strerror(mntres.nfsv2.fhs_status));
1064                         goto fail;
1065                 }
1066                 memcpy(data.root.data,
1067                        (char *) mntres.nfsv2.fhstatus_u.fhs_fhandle,
1068                        NFS_FHSIZE);
1069 #if NFS_MOUNT_VERSION >= 4
1070                 data.root.size = NFS_FHSIZE;
1071                 memcpy(data.old_root.data,
1072                        (char *) mntres.nfsv2.fhstatus_u.fhs_fhandle,
1073                        NFS_FHSIZE);
1074 #endif
1075         } else {
1076 #if NFS_MOUNT_VERSION >= 4
1077                 mountres3_ok *mountres;
1078                 fhandle3 *fhandle;
1079                 int i, *flavor, yum = 0;
1080                 if (mntres.nfsv3.fhs_status != 0) {
1081                         fprintf(stderr,
1082                                 _("mount: %s:%s failed, reason given by server: %s\n"),
1083                                 hostname, dirname,
1084                                 nfs_strerror(mntres.nfsv3.fhs_status));
1085                         goto fail;
1086                 }
1087 #if NFS_MOUNT_VERSION >= 5
1088                 mountres = &mntres.nfsv3.mountres3_u.mountinfo;
1089                 i = mountres->auth_flavors.auth_flavors_len;
1090                 if (i <= 0)
1091                         goto noauth_flavors;
1092
1093                 flavor = mountres->auth_flavors.auth_flavors_val;
1094                 while (--i >= 0) {
1095                         if (flavor[i] == data.pseudoflavor)
1096                                 yum = 1;
1097 #ifdef NFS_MOUNT_DEBUG
1098                         printf("auth flavor %d: %d\n",
1099                                 i, flavor[i]);
1100 #endif
1101                 }
1102                 if (!yum) {
1103                         fprintf(stderr,
1104                                 "mount: %s:%s failed, "
1105                                 "security flavor not supported\n",
1106                                 hostname, dirname);
1107                         /* server has registered us in mtab, send umount */
1108                         nfs_call_umount(&mnt_server, &dirname);
1109                         goto fail;
1110                 }
1111 noauth_flavors:
1112 #endif
1113                 fhandle = &mntres.nfsv3.mountres3_u.mountinfo.fhandle;
1114                 memset(data.old_root.data, 0, NFS_FHSIZE);
1115                 memset(&data.root, 0, sizeof(data.root));
1116                 data.root.size = fhandle->fhandle3_len;
1117                 memcpy(data.root.data,
1118                        (char *) fhandle->fhandle3_val,
1119                        fhandle->fhandle3_len);
1120
1121                 data.flags |= NFS_MOUNT_VER3;
1122 #endif
1123         }
1124
1125         /* create nfs socket for kernel */
1126
1127         if (nfs_pmap->pm_prot == IPPROTO_TCP)
1128                 fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
1129         else
1130                 fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
1131         if (fsock < 0) {
1132                 perror(_("nfs socket"));
1133                 goto fail;
1134         }
1135         if (bindresvport(fsock, 0) < 0) {
1136                 perror(_("nfs bindresvport"));
1137                 goto fail;
1138         }
1139 #ifdef NFS_MOUNT_DEBUG
1140         printf(_("using port %d for nfs deamon\n"), nfs_pmap->pm_port);
1141 #endif
1142         nfs_saddr->sin_port = htons(nfs_pmap->pm_port);
1143         /*
1144          * connect() the socket for kernels 1.3.10 and below only,
1145          * to avoid problems with multihomed hosts.
1146          * --Swen
1147          */
1148         if (linux_version_code() <= 66314
1149             && connect(fsock, (struct sockaddr *) nfs_saddr,
1150                        sizeof (*nfs_saddr)) < 0) {
1151                 perror(_("nfs connect"));
1152                 goto fail;
1153         }
1154
1155 #if NFS_MOUNT_VERSION >= 2
1156         if (nfs_pmap->pm_prot == IPPROTO_TCP)
1157                 data.flags |= NFS_MOUNT_TCP;
1158         else
1159                 data.flags &= ~NFS_MOUNT_TCP;
1160 #endif
1161
1162         /* prepare data structure for kernel */
1163
1164         data.fd = fsock;
1165         memcpy((char *) &data.addr, (char *) nfs_saddr, sizeof(data.addr));
1166         strncpy(data.hostname, hostname, sizeof(data.hostname));
1167
1168  out_ok:
1169         /* Ensure we have enough padding for the following strcat()s */
1170         if (strlen(new_opts) + strlen(s) + 30 >= sizeof(new_opts)) {
1171                 fprintf(stderr, _("mount: "
1172                                   "excessively long option argument\n"));
1173                 goto fail;
1174         }
1175
1176         snprintf(cbuf, sizeof(cbuf)-1, "addr=%s", s);
1177         strcat(new_opts, cbuf);
1178
1179         *extra_opts = xstrdup(new_opts);
1180         return 0;
1181
1182         /* abort */
1183  fail:
1184         if (fsock != -1)
1185                 close(fsock);
1186         return retval;
1187 }
1188
1189 /*
1190  * We need to translate between nfs status return values and
1191  * the local errno values which may not be the same.
1192  *
1193  * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno:
1194  * "after #include <errno.h> the symbol errno is reserved for any use,
1195  *  it cannot even be used as a struct tag or field name".
1196  */
1197
1198 #ifndef EDQUOT
1199 #define EDQUOT  ENOSPC
1200 #endif
1201
1202 static struct {
1203         enum nfsstat stat;
1204         int errnum;
1205 } nfs_errtbl[] = {
1206         { NFS_OK,               0               },
1207         { NFSERR_PERM,          EPERM           },
1208         { NFSERR_NOENT,         ENOENT          },
1209         { NFSERR_IO,            EIO             },
1210         { NFSERR_NXIO,          ENXIO           },
1211         { NFSERR_ACCES,         EACCES          },
1212         { NFSERR_EXIST,         EEXIST          },
1213         { NFSERR_NODEV,         ENODEV          },
1214         { NFSERR_NOTDIR,        ENOTDIR         },
1215         { NFSERR_ISDIR,         EISDIR          },
1216 #ifdef NFSERR_INVAL
1217         { NFSERR_INVAL,         EINVAL          },      /* that Sun forgot */
1218 #endif
1219         { NFSERR_FBIG,          EFBIG           },
1220         { NFSERR_NOSPC,         ENOSPC          },
1221         { NFSERR_ROFS,          EROFS           },
1222         { NFSERR_NAMETOOLONG,   ENAMETOOLONG    },
1223         { NFSERR_NOTEMPTY,      ENOTEMPTY       },
1224         { NFSERR_DQUOT,         EDQUOT          },
1225         { NFSERR_STALE,         ESTALE          },
1226 #ifdef EWFLUSH
1227         { NFSERR_WFLUSH,        EWFLUSH         },
1228 #endif
1229         /* Throw in some NFSv3 values for even more fun (HP returns these) */
1230         { 71,                   EREMOTE         },
1231
1232         { -1,                   EIO             }
1233 };
1234
1235 static char *nfs_strerror(int stat)
1236 {
1237         int i;
1238         static char buf[256];
1239
1240         for (i = 0; nfs_errtbl[i].stat != -1; i++) {
1241                 if (nfs_errtbl[i].stat == stat)
1242                         return strerror(nfs_errtbl[i].errnum);
1243         }
1244         sprintf(buf, _("unknown nfs status return value: %d"), stat);
1245         return buf;
1246 }