usr.sbin/mountd/mountd.c

   1 /*
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Herb Hasler and Rick Macklem at The University of Guelph.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #ifndef lint
  34 static const char copyright[] =
  35 "@(#) Copyright (c) 1989, 1993\n\
  36         The Regents of the University of California.  All rights reserved.\n";
  37 #endif /*not lint*/
  38
  39 #if 0
  40 #ifndef lint
  41 static char sccsid[] = "@(#)mountd.c    8.15 (Berkeley) 5/1/95";
  42 #endif /*not lint*/
  43 #endif
  44
  45 #include <sys/cdefs.h>
  46 __FBSDID("$FreeBSD$");
  47
  48 #include <sys/param.h>
  49 #include <sys/fcntl.h>
  50 #include <sys/linker.h>
  51 #include <sys/module.h>
  52 #include <sys/mount.h>
  53 #include <sys/queue.h>
  54 #include <sys/stat.h>
  55 #include <sys/sysctl.h>
  56 #include <sys/syslog.h>
  57
  58 #include <rpc/rpc.h>
  59 #include <rpc/rpc_com.h>
  60 #include <rpc/pmap_clnt.h>
  61 #include <rpc/pmap_prot.h>
  62 #include <rpcsvc/mount.h>
  63 #include <nfs/nfsproto.h>
  64 #include <nfs/nfssvc.h>
  65 #include <nfsserver/nfs.h>
  66
  67 #include <fs/nfs/nfsport.h>
  68
  69 #include <arpa/inet.h>
  70
  71 #include <ctype.h>
  72 #include <err.h>
  73 #include <errno.h>
  74 #include <grp.h>
  75 #include <libutil.h>
  76 #include <limits.h>
  77 #include <netdb.h>
  78 #include <pwd.h>
  79 #include <signal.h>
  80 #include <stdio.h>
  81 #include <stdlib.h>
  82 #include <string.h>
  83 #include <unistd.h>
  84 #include "pathnames.h"
  85 #include "mntopts.h"
  86
  87 #ifdef DEBUG
  88 #include <stdarg.h>
  89 #endif
  90
  91 /*
  92  * Structures for keeping the mount list and export list
  93  */
  94 struct mountlist {
  95         char    ml_host[MNTNAMLEN+1];
  96         char    ml_dirp[MNTPATHLEN+1];
  97
  98         SLIST_ENTRY(mountlist)  next;
  99 };
 100
 101 struct dirlist {
 102         struct dirlist  *dp_left;
 103         struct dirlist  *dp_right;
 104         int             dp_flag;
 105         struct hostlist *dp_hosts;      /* List of hosts this dir exported to */
 106         char            *dp_dirp;
 107 };
 108 /* dp_flag bits */
 109 #define DP_DEFSET       0x1
 110 #define DP_HOSTSET      0x2
 111
 112 struct exportlist {
 113         struct dirlist  *ex_dirl;
 114         struct dirlist  *ex_defdir;
 115         int             ex_flag;
 116         fsid_t          ex_fs;
 117         char            *ex_fsdir;
 118         char            *ex_indexfile;
 119         int             ex_numsecflavors;
 120         int             ex_secflavors[MAXSECFLAVORS];
 121         int             ex_defnumsecflavors;
 122         int             ex_defsecflavors[MAXSECFLAVORS];
 123
 124         SLIST_ENTRY(exportlist) entries;
 125 };
 126 /* ex_flag bits */
 127 #define EX_LINKED       0x1
 128
 129 struct netmsk {
 130         struct sockaddr_storage nt_net;
 131         struct sockaddr_storage nt_mask;
 132         char            *nt_name;
 133 };
 134
 135 union grouptypes {
 136         struct addrinfo *gt_addrinfo;
 137         struct netmsk   gt_net;
 138 };
 139
 140 struct grouplist {
 141         int gr_type;
 142         union grouptypes gr_ptr;
 143         struct grouplist *gr_next;
 144         int gr_numsecflavors;
 145         int gr_secflavors[MAXSECFLAVORS];
 146 };
 147 /* Group types */
 148 #define GT_NULL         0x0
 149 #define GT_HOST         0x1
 150 #define GT_NET          0x2
 151 #define GT_DEFAULT      0x3
 152 #define GT_IGNORE       0x5
 153
 154 struct hostlist {
 155         int              ht_flag;       /* Uses DP_xx bits */
 156         struct grouplist *ht_grp;
 157         struct hostlist  *ht_next;
 158 };
 159
 160 struct fhreturn {
 161         int     fhr_flag;
 162         int     fhr_vers;
 163         nfsfh_t fhr_fh;
 164         int     fhr_numsecflavors;
 165         int     *fhr_secflavors;
 166 };
 167
 168 #define GETPORT_MAXTRY  20      /* Max tries to get a port # */
 169
 170 /* Global defs */
 171 static char     *add_expdir(struct dirlist **, char *, int);
 172 static void     add_dlist(struct dirlist **, struct dirlist *,
 173                     struct grouplist *, int, struct exportlist *);
 174 static void     add_mlist(char *, char *);
 175 static int      check_dirpath(char *);
 176 static int      check_options(struct dirlist *);
 177 static int      checkmask(struct sockaddr *sa);
 178 static int      chk_host(struct dirlist *, struct sockaddr *, int *, int *,
 179                     int *, int **);
 180 static char     *strsep_quote(char **stringp, const char *delim);
 181 static int      create_service(struct netconfig *nconf);
 182 static void     complete_service(struct netconfig *nconf, char *port_str);
 183 static void     clearout_service(void);
 184 static void     del_mlist(char *hostp, char *dirp);
 185 static struct dirlist   *dirp_search(struct dirlist *, char *);
 186 static int      do_mount(struct exportlist *, struct grouplist *, int,
 187                     struct xucred *, char *, int, struct statfs *);
 188 static int      do_opt(char **, char **, struct exportlist *,
 189                     struct grouplist *, int *, int *, struct xucred *);
 190 static struct exportlist        *ex_search(fsid_t *);
 191 static struct exportlist        *get_exp(void);
 192 static void     free_dir(struct dirlist *);
 193 static void     free_exp(struct exportlist *);
 194 static void     free_grp(struct grouplist *);
 195 static void     free_host(struct hostlist *);
 196 static void     get_exportlist(void);
 197 static int      get_host(char *, struct grouplist *, struct grouplist *);
 198 static struct hostlist *get_ht(void);
 199 static int      get_line(void);
 200 static void     get_mountlist(void);
 201 static int      get_net(char *, struct netmsk *, int);
 202 static void     getexp_err(struct exportlist *, struct grouplist *);
 203 static struct grouplist *get_grp(void);
 204 static void     hang_dirp(struct dirlist *, struct grouplist *,
 205                                 struct exportlist *, int);
 206 static void     huphandler(int sig);
 207 static int      makemask(struct sockaddr_storage *ssp, int bitlen);
 208 static void     mntsrv(struct svc_req *, SVCXPRT *);
 209 static void     nextfield(char **, char **);
 210 static void     out_of_mem(void);
 211 static void     parsecred(char *, struct xucred *);
 212 static int      parsesec(char *, struct exportlist *);
 213 static int      put_exlist(struct dirlist *, XDR *, struct dirlist *,
 214                     int *, int);
 215 static void     *sa_rawaddr(struct sockaddr *sa, int *nbytes);
 216 static int      sacmp(struct sockaddr *sa1, struct sockaddr *sa2,
 217                     struct sockaddr *samask);
 218 static int      scan_tree(struct dirlist *, struct sockaddr *);
 219 static void     usage(void);
 220 static int      xdr_dir(XDR *, char *);
 221 static int      xdr_explist(XDR *, caddr_t);
 222 static int      xdr_explist_brief(XDR *, caddr_t);
 223 static int      xdr_explist_common(XDR *, caddr_t, int);
 224 static int      xdr_fhs(XDR *, caddr_t);
 225 static int      xdr_mlist(XDR *, caddr_t);
 226 static void     terminate(int);
 227
 228 static SLIST_HEAD(, exportlist) exphead = SLIST_HEAD_INITIALIZER(exphead);
 229 static SLIST_HEAD(, mountlist) mlhead = SLIST_HEAD_INITIALIZER(mlhead);
 230 static struct grouplist *grphead;
 231 static char *exnames_default[2] = { _PATH_EXPORTS, NULL };
 232 static char **exnames;
 233 static char **hosts = NULL;
 234 static struct xucred def_anon = {
 235         XUCRED_VERSION,
 236         (uid_t)65534,
 237         1,
 238         { (gid_t)65533 },
 239         NULL
 240 };
 241 static int force_v2 = 0;
 242 static int resvport_only = 1;
 243 static int nhosts = 0;
 244 static int dir_only = 1;
 245 static int dolog = 0;
 246 static int got_sighup = 0;
 247 static int xcreated = 0;
 248
 249 static char *svcport_str = NULL;
 250 static int mallocd_svcport = 0;
 251 static int *sock_fd;
 252 static int sock_fdcnt;
 253 static int sock_fdpos;
 254 static int suspend_nfsd = 0;
 255
 256 static int opt_flags;
 257 static int have_v6 = 1;
 258
 259 static int v4root_phase = 0;
 260 static char v4root_dirpath[PATH_MAX + 1];
 261 static int has_publicfh = 0;
 262
 263 static struct pidfh *pfh = NULL;
 264 /* Bits for opt_flags above */
 265 #define OP_MAPROOT      0x01
 266 #define OP_MAPALL       0x02
 267 /* 0x4 free */
 268 #define OP_MASK         0x08
 269 #define OP_NET          0x10
 270 #define OP_ALLDIRS      0x40
 271 #define OP_HAVEMASK     0x80    /* A mask was specified or inferred. */
 272 #define OP_QUIET        0x100
 273 #define OP_MASKLEN      0x200
 274 #define OP_SEC          0x400
 275
 276 #ifdef DEBUG
 277 static int debug = 1;
 278 static void     SYSLOG(int, const char *, ...) __printflike(2, 3);
 279 #define syslog SYSLOG
 280 #else
 281 static int debug = 0;
 282 #endif
 283
 284 /*
 285  * Similar to strsep(), but it allows for quoted strings
 286  * and escaped characters.
 287  *
 288  * It returns the string (or NULL, if *stringp is NULL),
 289  * which is a de-quoted version of the string if necessary.
 290  *
 291  * It modifies *stringp in place.
 292  */
 293 static char *
 294 strsep_quote(char **stringp, const char *delim)
 295 {
 296         char *srcptr, *dstptr, *retval;
 297         char quot = 0;
 298
 299         if (stringp == NULL || *stringp == NULL)
 300                 return (NULL);
 301
 302         srcptr = dstptr = retval = *stringp;
 303
 304         while (*srcptr) {
 305                 /*
 306                  * We're looking for several edge cases here.
 307                  * First:  if we're in quote state (quot != 0),
 308                  * then we ignore the delim characters, but otherwise
 309                  * process as normal, unless it is the quote character.
 310                  * Second:  if the current character is a backslash,
 311                  * we take the next character as-is, without checking
 312                  * for delim, quote, or backslash.  Exception:  if the
 313                  * next character is a NUL, that's the end of the string.
 314                  * Third:  if the character is a quote character, we toggle
 315                  * quote state.
 316                  * Otherwise:  check the current character for NUL, or
 317                  * being in delim, and end the string if either is true.
 318                  */
 319                 if (*srcptr == '\\') {
 320                         srcptr++;
 321                         /*
 322                          * The edge case here is if the next character
 323                          * is NUL, we want to stop processing.  But if
 324                          * it's not NUL, then we simply want to copy it.
 325                          */
 326                         if (*srcptr) {
 327                                 *dstptr++ = *srcptr++;
 328                         }
 329                         continue;
 330                 }
 331                 if (quot == 0 && (*srcptr == '\'' || *srcptr == '"')) {
 332                         quot = *srcptr++;
 333                         continue;
 334                 }
 335                 if (quot && *srcptr == quot) {
 336                         /* End of the quoted part */
 337                         quot = 0;
 338                         srcptr++;
 339                         continue;
 340                 }
 341                 if (!quot && strchr(delim, *srcptr))
 342                         break;
 343                 *dstptr++ = *srcptr++;
 344         }
 345
 346         *dstptr = 0; /* Terminate the string */
 347         *stringp = (*srcptr == '\0') ? NULL : srcptr + 1;
 348         return (retval);
 349 }
 350
 351 /*
 352  * Mountd server for NFS mount protocol as described in:
 353  * NFS: Network File System Protocol Specification, RFC1094, Appendix A
 354  * The optional arguments are the exports file name
 355  * default: _PATH_EXPORTS
 356  * and "-n" to allow nonroot mount.
 357  */
 358 int
 359 main(int argc, char **argv)
 360 {
 361         fd_set readfds;
 362         struct netconfig *nconf;
 363         char *endptr, **hosts_bak;
 364         void *nc_handle;
 365         pid_t otherpid;
 366         in_port_t svcport;
 367         int c, k, s;
 368         int maxrec = RPC_MAXDATASIZE;
 369         int attempt_cnt, port_len, port_pos, ret;
 370         char **port_list;
 371
 372         /* Check that another mountd isn't already running. */
 373         pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &otherpid);
 374         if (pfh == NULL) {
 375                 if (errno == EEXIST)
 376                         errx(1, "mountd already running, pid: %d.", otherpid);
 377                 warn("cannot open or create pidfile");
 378         }
 379
 380         s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
 381         if (s < 0)
 382                 have_v6 = 0;
 383         else
 384                 close(s);
 385
 386         while ((c = getopt(argc, argv, "2deh:lnp:rS")) != -1)
 387                 switch (c) {
 388                 case '2':
 389                         force_v2 = 1;
 390                         break;
 391                 case 'e':
 392                         /* now a no-op, since this is the default */
 393                         break;
 394                 case 'n':
 395                         resvport_only = 0;
 396                         break;
 397                 case 'r':
 398                         dir_only = 0;
 399                         break;
 400                 case 'd':
 401                         debug = debug ? 0 : 1;
 402                         break;
 403                 case 'l':
 404                         dolog = 1;
 405                         break;
 406                 case 'p':
 407                         endptr = NULL;
 408                         svcport = (in_port_t)strtoul(optarg, &endptr, 10);
 409                         if (endptr == NULL || *endptr != '\0' ||
 410                             svcport == 0 || svcport >= IPPORT_MAX)
 411                                 usage();
 412                         svcport_str = strdup(optarg);
 413                         break;
 414                 case 'h':
 415                         ++nhosts;
 416                         hosts_bak = hosts;
 417                         hosts_bak = realloc(hosts, nhosts * sizeof(char *));
 418                         if (hosts_bak == NULL) {
 419                                 if (hosts != NULL) {
 420                                         for (k = 0; k < nhosts; k++)
 421                                                 free(hosts[k]);
 422                                         free(hosts);
 423                                         out_of_mem();
 424                                 }
 425                         }
 426                         hosts = hosts_bak;
 427                         hosts[nhosts - 1] = strdup(optarg);
 428                         if (hosts[nhosts - 1] == NULL) {
 429                                 for (k = 0; k < (nhosts - 1); k++)
 430                                         free(hosts[k]);
 431                                 free(hosts);
 432                                 out_of_mem();
 433                         }
 434                         break;
 435                 case 'S':
 436                         suspend_nfsd = 1;
 437                         break;
 438                 default:
 439                         usage();
 440                 }
 441
 442         if (modfind("nfsd") < 0) {
 443                 /* Not present in kernel, try loading it */
 444                 if (kldload("nfsd") < 0 || modfind("nfsd") < 0)
 445                         errx(1, "NFS server is not available");
 446         }
 447
 448         argc -= optind;
 449         argv += optind;
 450         grphead = (struct grouplist *)NULL;
 451         if (argc > 0)
 452                 exnames = argv;
 453         else
 454                 exnames = exnames_default;
 455         openlog("mountd", LOG_PID, LOG_DAEMON);
 456         if (debug)
 457                 warnx("getting export list");
 458         get_exportlist();
 459         if (debug)
 460                 warnx("getting mount list");
 461         get_mountlist();
 462         if (debug)
 463                 warnx("here we go");
 464         if (debug == 0) {
 465                 daemon(0, 0);
 466                 signal(SIGINT, SIG_IGN);
 467                 signal(SIGQUIT, SIG_IGN);
 468         }
 469         signal(SIGHUP, huphandler);
 470         signal(SIGTERM, terminate);
 471         signal(SIGPIPE, SIG_IGN);
 472
 473         pidfile_write(pfh);
 474
 475         rpcb_unset(MOUNTPROG, MOUNTVERS, NULL);
 476         rpcb_unset(MOUNTPROG, MOUNTVERS3, NULL);
 477         rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);
 478
 479         if (!resvport_only) {
 480                 if (sysctlbyname("vfs.nfsd.nfs_privport", NULL, NULL,
 481                     &resvport_only, sizeof(resvport_only)) != 0 &&
 482                     errno != ENOENT) {
 483                         syslog(LOG_ERR, "sysctl: %m");
 484                         exit(1);
 485                 }
 486         }
 487
 488         /*
 489          * If no hosts were specified, add a wildcard entry to bind to
 490          * INADDR_ANY. Otherwise make sure 127.0.0.1 and ::1 are added to the
 491          * list.
 492          */
 493         if (nhosts == 0) {
 494                 hosts = malloc(sizeof(char *));
 495                 if (hosts == NULL)
 496                         out_of_mem();
 497                 hosts[0] = "*";
 498                 nhosts = 1;
 499         } else {
 500                 hosts_bak = hosts;
 501                 if (have_v6) {
 502                         hosts_bak = realloc(hosts, (nhosts + 2) *
 503                             sizeof(char *));
 504                         if (hosts_bak == NULL) {
 505                                 for (k = 0; k < nhosts; k++)
 506                                         free(hosts[k]);
 507                                 free(hosts);
 508                                 out_of_mem();
 509                         } else
 510                                 hosts = hosts_bak;
 511                         nhosts += 2;
 512                         hosts[nhosts - 2] = "::1";
 513                 } else {
 514                         hosts_bak = realloc(hosts, (nhosts + 1) * sizeof(char *));
 515                         if (hosts_bak == NULL) {
 516                                 for (k = 0; k < nhosts; k++)
 517                                         free(hosts[k]);
 518                                 free(hosts);
 519                                 out_of_mem();
 520                         } else {
 521                                 nhosts += 1;
 522                                 hosts = hosts_bak;
 523                         }
 524                 }
 525
 526                 hosts[nhosts - 1] = "127.0.0.1";
 527         }
 528
 529         attempt_cnt = 1;
 530         sock_fdcnt = 0;
 531         sock_fd = NULL;
 532         port_list = NULL;
 533         port_len = 0;
 534         nc_handle = setnetconfig();
 535         while ((nconf = getnetconfig(nc_handle))) {
 536                 if (nconf->nc_flag & NC_VISIBLE) {
 537                         if (have_v6 == 0 && strcmp(nconf->nc_protofmly,
 538                             "inet6") == 0) {
 539                                 /* DO NOTHING */
 540                         } else {
 541                                 ret = create_service(nconf);
 542                                 if (ret == 1)
 543                                         /* Ignore this call */
 544                                         continue;
 545                                 if (ret < 0) {
 546                                         /*
 547                                          * Failed to bind port, so close off
 548                                          * all sockets created and try again
 549                                          * if the port# was dynamically
 550                                          * assigned via bind(2).
 551                                          */
 552                                         clearout_service();
 553                                         if (mallocd_svcport != 0 &&
 554                                             attempt_cnt < GETPORT_MAXTRY) {
 555                                                 free(svcport_str);
 556                                                 svcport_str = NULL;
 557                                                 mallocd_svcport = 0;
 558                                         } else {
 559                                                 errno = EADDRINUSE;
 560                                                 syslog(LOG_ERR,
 561                                                     "bindresvport_sa: %m");
 562                                                 exit(1);
 563                                         }
 564
 565                                         /* Start over at the first service. */
 566                                         free(sock_fd);
 567                                         sock_fdcnt = 0;
 568                                         sock_fd = NULL;
 569                                         nc_handle = setnetconfig();
 570                                         attempt_cnt++;
 571                                 } else if (mallocd_svcport != 0 &&
 572                                     attempt_cnt == GETPORT_MAXTRY) {
 573                                         /*
 574                                          * For the last attempt, allow
 575                                          * different port #s for each nconf
 576                                          * by saving the svcport_str and
 577                                          * setting it back to NULL.
 578                                          */
 579                                         port_list = realloc(port_list,
 580                                             (port_len + 1) * sizeof(char *));
 581                                         if (port_list == NULL)
 582                                                 out_of_mem();
 583                                         port_list[port_len++] = svcport_str;
 584                                         svcport_str = NULL;
 585                                         mallocd_svcport = 0;
 586                                 }
 587                         }
 588                 }
 589         }
 590
 591         /*
 592          * Successfully bound the ports, so call complete_service() to
 593          * do the rest of the setup on the service(s).
 594          */
 595         sock_fdpos = 0;
 596         port_pos = 0;
 597         nc_handle = setnetconfig();
 598         while ((nconf = getnetconfig(nc_handle))) {
 599                 if (nconf->nc_flag & NC_VISIBLE) {
 600                         if (have_v6 == 0 && strcmp(nconf->nc_protofmly,
 601                             "inet6") == 0) {
 602                                 /* DO NOTHING */
 603                         } else if (port_list != NULL) {
 604                                 if (port_pos >= port_len) {
 605                                         syslog(LOG_ERR, "too many port#s");
 606                                         exit(1);
 607                                 }
 608                                 complete_service(nconf, port_list[port_pos++]);
 609                         } else
 610                                 complete_service(nconf, svcport_str);
 611                 }
 612         }
 613         endnetconfig(nc_handle);
 614         free(sock_fd);
 615         if (port_list != NULL) {
 616                 for (port_pos = 0; port_pos < port_len; port_pos++)
 617                         free(port_list[port_pos]);
 618                 free(port_list);
 619         }
 620
 621         if (xcreated == 0) {
 622                 syslog(LOG_ERR, "could not create any services");
 623                 exit(1);
 624         }
 625
 626         /* Expand svc_run() here so that we can call get_exportlist(). */
 627         for (;;) {
 628                 if (got_sighup) {
 629                         get_exportlist();
 630                         got_sighup = 0;
 631                 }
 632                 readfds = svc_fdset;
 633                 switch (select(svc_maxfd + 1, &readfds, NULL, NULL, NULL)) {
 634                 case -1:
 635                         if (errno == EINTR)
 636                                 continue;
 637                         syslog(LOG_ERR, "mountd died: select: %m");
 638                         exit(1);
 639                 case 0:
 640                         continue;
 641                 default:
 642                         svc_getreqset(&readfds);
 643                 }
 644         }
 645 }
 646
 647 /*
 648  * This routine creates and binds sockets on the appropriate
 649  * addresses. It gets called one time for each transport.
 650  * It returns 0 upon success, 1 for ingore the call and -1 to indicate
 651  * bind failed with EADDRINUSE.
 652  * Any file descriptors that have been created are stored in sock_fd and
 653  * the total count of them is maintained in sock_fdcnt.
 654  */
 655 static int
 656 create_service(struct netconfig *nconf)
 657 {
 658         struct addrinfo hints, *res = NULL;
 659         struct sockaddr_in *sin;
 660         struct sockaddr_in6 *sin6;
 661         struct __rpc_sockinfo si;
 662         int aicode;
 663         int fd;
 664         int nhostsbak;
 665         int one = 1;
 666         int r;
 667         u_int32_t host_addr[4];  /* IPv4 or IPv6 */
 668         int mallocd_res;
 669
 670         if ((nconf->nc_semantics != NC_TPI_CLTS) &&
 671             (nconf->nc_semantics != NC_TPI_COTS) &&
 672             (nconf->nc_semantics != NC_TPI_COTS_ORD))
 673                 return (1);     /* not my type */
 674
 675         /*
 676          * XXX - using RPC library internal functions.
 677          */
 678         if (!__rpc_nconf2sockinfo(nconf, &si)) {
 679                 syslog(LOG_ERR, "cannot get information for %s",
 680                     nconf->nc_netid);
 681                 return (1);
 682         }
 683
 684         /* Get mountd's address on this transport */
 685         memset(&hints, 0, sizeof hints);
 686         hints.ai_family = si.si_af;
 687         hints.ai_socktype = si.si_socktype;
 688         hints.ai_protocol = si.si_proto;
 689
 690         /*
 691          * Bind to specific IPs if asked to
 692          */
 693         nhostsbak = nhosts;
 694         while (nhostsbak > 0) {
 695                 --nhostsbak;
 696                 sock_fd = realloc(sock_fd, (sock_fdcnt + 1) * sizeof(int));
 697                 if (sock_fd == NULL)
 698                         out_of_mem();
 699                 sock_fd[sock_fdcnt++] = -1;     /* Set invalid for now. */
 700                 mallocd_res = 0;
 701
 702                 hints.ai_flags = AI_PASSIVE;
 703
 704                 /*
 705                  * XXX - using RPC library internal functions.
 706                  */
 707                 if ((fd = __rpc_nconf2fd(nconf)) < 0) {
 708                         int non_fatal = 0;
 709                         if (errno == EAFNOSUPPORT &&
 710                             nconf->nc_semantics != NC_TPI_CLTS)
 711                                 non_fatal = 1;
 712
 713                         syslog(non_fatal ? LOG_DEBUG : LOG_ERR,
 714                             "cannot create socket for %s", nconf->nc_netid);
 715                         if (non_fatal != 0)
 716                                 continue;
 717                         exit(1);
 718                 }
 719
 720                 switch (hints.ai_family) {
 721                 case AF_INET:
 722                         if (inet_pton(AF_INET, hosts[nhostsbak],
 723                             host_addr) == 1) {
 724                                 hints.ai_flags |= AI_NUMERICHOST;
 725                         } else {
 726                                 /*
 727                                  * Skip if we have an AF_INET6 address.
 728                                  */
 729                                 if (inet_pton(AF_INET6, hosts[nhostsbak],
 730                                     host_addr) == 1) {
 731                                         close(fd);
 732                                         continue;
 733                                 }
 734                         }
 735                         break;
 736                 case AF_INET6:
 737                         if (inet_pton(AF_INET6, hosts[nhostsbak],
 738                             host_addr) == 1) {
 739                                 hints.ai_flags |= AI_NUMERICHOST;
 740                         } else {
 741                                 /*
 742                                  * Skip if we have an AF_INET address.
 743                                  */
 744                                 if (inet_pton(AF_INET, hosts[nhostsbak],
 745                                     host_addr) == 1) {
 746                                         close(fd);
 747                                         continue;
 748                                 }
 749                         }
 750
 751                         /*
 752                          * We're doing host-based access checks here, so don't
 753                          * allow v4-in-v6 to confuse things. The kernel will
 754                          * disable it by default on NFS sockets too.
 755                          */
 756                         if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one,
 757                             sizeof one) < 0) {
 758                                 syslog(LOG_ERR,
 759                                     "can't disable v4-in-v6 on IPv6 socket");
 760                                 exit(1);
 761                         }
 762                         break;
 763                 default:
 764                         break;
 765                 }
 766
 767                 /*
 768                  * If no hosts were specified, just bind to INADDR_ANY
 769                  */
 770                 if (strcmp("*", hosts[nhostsbak]) == 0) {
 771                         if (svcport_str == NULL) {
 772                                 res = malloc(sizeof(struct addrinfo));
 773                                 if (res == NULL)
 774                                         out_of_mem();
 775                                 mallocd_res = 1;
 776                                 res->ai_flags = hints.ai_flags;
 777                                 res->ai_family = hints.ai_family;
 778                                 res->ai_protocol = hints.ai_protocol;
 779                                 switch (res->ai_family) {
 780                                 case AF_INET:
 781                                         sin = malloc(sizeof(struct sockaddr_in));
 782                                         if (sin == NULL)
 783                                                 out_of_mem();
 784                                         sin->sin_family = AF_INET;
 785                                         sin->sin_port = htons(0);
 786                                         sin->sin_addr.s_addr = htonl(INADDR_ANY);
 787                                         res->ai_addr = (struct sockaddr*) sin;
 788                                         res->ai_addrlen = (socklen_t)
 789                                             sizeof(struct sockaddr_in);
 790                                         break;
 791                                 case AF_INET6:
 792                                         sin6 = malloc(sizeof(struct sockaddr_in6));
 793                                         if (sin6 == NULL)
 794                                                 out_of_mem();
 795                                         sin6->sin6_family = AF_INET6;
 796                                         sin6->sin6_port = htons(0);
 797                                         sin6->sin6_addr = in6addr_any;
 798                                         res->ai_addr = (struct sockaddr*) sin6;
 799                                         res->ai_addrlen = (socklen_t)
 800                                             sizeof(struct sockaddr_in6);
 801                                         break;
 802                                 default:
 803                                         syslog(LOG_ERR, "bad addr fam %d",
 804                                             res->ai_family);
 805                                         exit(1);
 806                                 }
 807                         } else {
 808                                 if ((aicode = getaddrinfo(NULL, svcport_str,
 809                                     &hints, &res)) != 0) {
 810                                         syslog(LOG_ERR,
 811                                             "cannot get local address for %s: %s",
 812                                             nconf->nc_netid,
 813                                             gai_strerror(aicode));
 814                                         close(fd);
 815                                         continue;
 816                                 }
 817                         }
 818                 } else {
 819                         if ((aicode = getaddrinfo(hosts[nhostsbak], svcport_str,
 820                             &hints, &res)) != 0) {
 821                                 syslog(LOG_ERR,
 822                                     "cannot get local address for %s: %s",
 823                                     nconf->nc_netid, gai_strerror(aicode));
 824                                 close(fd);
 825                                 continue;
 826                         }
 827                 }
 828
 829                 /* Store the fd. */
 830                 sock_fd[sock_fdcnt - 1] = fd;
 831
 832                 /* Now, attempt the bind. */
 833                 r = bindresvport_sa(fd, res->ai_addr);
 834                 if (r != 0) {
 835                         if (errno == EADDRINUSE && mallocd_svcport != 0) {
 836                                 if (mallocd_res != 0) {
 837                                         free(res->ai_addr);
 838                                         free(res);
 839                                 } else
 840                                         freeaddrinfo(res);
 841                                 return (-1);
 842                         }
 843                         syslog(LOG_ERR, "bindresvport_sa: %m");
 844                         exit(1);
 845                 }
 846
 847                 if (svcport_str == NULL) {
 848                         svcport_str = malloc(NI_MAXSERV * sizeof(char));
 849                         if (svcport_str == NULL)
 850                                 out_of_mem();
 851                         mallocd_svcport = 1;
 852
 853                         if (getnameinfo(res->ai_addr,
 854                             res->ai_addr->sa_len, NULL, NI_MAXHOST,
 855                             svcport_str, NI_MAXSERV * sizeof(char),
 856                             NI_NUMERICHOST | NI_NUMERICSERV))
 857                                 errx(1, "Cannot get port number");
 858                 }
 859                 if (mallocd_res != 0) {
 860                         free(res->ai_addr);
 861                         free(res);
 862                 } else
 863                         freeaddrinfo(res);
 864                 res = NULL;
 865         }
 866         return (0);
 867 }
 868
 869 /*
 870  * Called after all the create_service() calls have succeeded, to complete
 871  * the setup and registration.
 872  */
 873 static void
 874 complete_service(struct netconfig *nconf, char *port_str)
 875 {
 876         struct addrinfo hints, *res = NULL;
 877         struct __rpc_sockinfo si;
 878         struct netbuf servaddr;
 879         SVCXPRT *transp = NULL;
 880         int aicode, fd, nhostsbak;
 881         int registered = 0;
 882
 883         if ((nconf->nc_semantics != NC_TPI_CLTS) &&
 884             (nconf->nc_semantics != NC_TPI_COTS) &&
 885             (nconf->nc_semantics != NC_TPI_COTS_ORD))
 886                 return; /* not my type */
 887
 888         /*
 889          * XXX - using RPC library internal functions.
 890          */
 891         if (!__rpc_nconf2sockinfo(nconf, &si)) {
 892                 syslog(LOG_ERR, "cannot get information for %s",
 893                     nconf->nc_netid);
 894                 return;
 895         }
 896
 897         nhostsbak = nhosts;
 898         while (nhostsbak > 0) {
 899                 --nhostsbak;
 900                 if (sock_fdpos >= sock_fdcnt) {
 901                         /* Should never happen. */
 902                         syslog(LOG_ERR, "Ran out of socket fd's");
 903                         return;
 904                 }
 905                 fd = sock_fd[sock_fdpos++];
 906                 if (fd < 0)
 907                         continue;
 908
 909                 if (nconf->nc_semantics != NC_TPI_CLTS)
 910                         listen(fd, SOMAXCONN);
 911
 912                 if (nconf->nc_semantics == NC_TPI_CLTS )
 913                         transp = svc_dg_create(fd, 0, 0);
 914                 else
 915                         transp = svc_vc_create(fd, RPC_MAXDATASIZE,
 916                             RPC_MAXDATASIZE);
 917
 918                 if (transp != (SVCXPRT *) NULL) {
 919                         if (!svc_reg(transp, MOUNTPROG, MOUNTVERS, mntsrv,
 920                             NULL))
 921                                 syslog(LOG_ERR,
 922                                     "can't register %s MOUNTVERS service",
 923                                     nconf->nc_netid);
 924                         if (!force_v2) {
 925                                 if (!svc_reg(transp, MOUNTPROG, MOUNTVERS3,
 926                                     mntsrv, NULL))
 927                                         syslog(LOG_ERR,
 928                                             "can't register %s MOUNTVERS3 service",
 929                                             nconf->nc_netid);
 930                         }
 931                 } else
 932                         syslog(LOG_WARNING, "can't create %s services",
 933                             nconf->nc_netid);
 934
 935                 if (registered == 0) {
 936                         registered = 1;
 937                         memset(&hints, 0, sizeof hints);
 938                         hints.ai_flags = AI_PASSIVE;
 939                         hints.ai_family = si.si_af;
 940                         hints.ai_socktype = si.si_socktype;
 941                         hints.ai_protocol = si.si_proto;
 942
 943                         if ((aicode = getaddrinfo(NULL, port_str, &hints,
 944                             &res)) != 0) {
 945                                 syslog(LOG_ERR, "cannot get local address: %s",
 946                                     gai_strerror(aicode));
 947                                 exit(1);
 948                         }
 949
 950                         servaddr.buf = malloc(res->ai_addrlen);
 951                         memcpy(servaddr.buf, res->ai_addr, res->ai_addrlen);
 952                         servaddr.len = res->ai_addrlen;
 953
 954                         rpcb_set(MOUNTPROG, MOUNTVERS, nconf, &servaddr);
 955                         rpcb_set(MOUNTPROG, MOUNTVERS3, nconf, &servaddr);
 956
 957                         xcreated++;
 958                         freeaddrinfo(res);
 959                 }
 960         } /* end while */
 961 }
 962
 963 /*
 964  * Clear out sockets after a failure to bind one of them, so that the
 965  * cycle of socket creation/binding can start anew.
 966  */
 967 static void
 968 clearout_service(void)
 969 {
 970         int i;
 971
 972         for (i = 0; i < sock_fdcnt; i++) {
 973                 if (sock_fd[i] >= 0) {
 974                         shutdown(sock_fd[i], SHUT_RDWR);
 975                         close(sock_fd[i]);
 976                 }
 977         }
 978 }
 979
 980 static void
 981 usage(void)
 982 {
 983         fprintf(stderr,
 984                 "usage: mountd [-2] [-d] [-e] [-l] [-n] [-p <port>] [-r] "
 985                 "[-S] [-h <bindip>] [export_file ...]\n");
 986         exit(1);
 987 }
 988
 989 /*
 990  * The mount rpc service
 991  */
 992 void
 993 mntsrv(struct svc_req *rqstp, SVCXPRT *transp)
 994 {
 995         struct exportlist *ep;
 996         struct dirlist *dp;
 997         struct fhreturn fhr;
 998         struct stat stb;
 999         struct statfs fsb;
1000         char host[NI_MAXHOST], numerichost[NI_MAXHOST];
1001         int lookup_failed = 1;
1002         struct sockaddr *saddr;
1003         u_short sport;
1004         char rpcpath[MNTPATHLEN + 1], dirpath[MAXPATHLEN];
1005         int bad = 0, defset, hostset;
1006         sigset_t sighup_mask;
1007         int numsecflavors, *secflavorsp;
1008
1009         sigemptyset(&sighup_mask);
1010         sigaddset(&sighup_mask, SIGHUP);
1011         saddr = svc_getrpccaller(transp)->buf;
1012         switch (saddr->sa_family) {
1013         case AF_INET6:
1014                 sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port);
1015                 break;
1016         case AF_INET:
1017                 sport = ntohs(((struct sockaddr_in *)saddr)->sin_port);
1018                 break;
1019         default:
1020                 syslog(LOG_ERR, "request from unknown address family");
1021                 return;
1022         }
1023         lookup_failed = getnameinfo(saddr, saddr->sa_len, host, sizeof host,
1024             NULL, 0, 0);
1025         getnameinfo(saddr, saddr->sa_len, numerichost,
1026             sizeof numerichost, NULL, 0, NI_NUMERICHOST);
1027         switch (rqstp->rq_proc) {
1028         case NULLPROC:
1029                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
1030                         syslog(LOG_ERR, "can't send reply");
1031                 return;
1032         case MOUNTPROC_MNT:
1033                 if (sport >= IPPORT_RESERVED && resvport_only) {
1034                         syslog(LOG_NOTICE,
1035                             "mount request from %s from unprivileged port",
1036                             numerichost);
1037                         svcerr_weakauth(transp);
1038                         return;
1039                 }
1040                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
1041                         syslog(LOG_NOTICE, "undecodable mount request from %s",
1042                             numerichost);
1043                         svcerr_decode(transp);
1044                         return;
1045                 }
1046
1047                 /*
1048                  * Get the real pathname and make sure it is a directory
1049                  * or a regular file if the -r option was specified
1050                  * and it exists.
1051                  */
1052                 if (realpath(rpcpath, dirpath) == NULL ||
1053                     stat(dirpath, &stb) < 0 ||
1054                     (!S_ISDIR(stb.st_mode) &&
1055                     (dir_only || !S_ISREG(stb.st_mode))) ||
1056                     statfs(dirpath, &fsb) < 0) {
1057                         chdir("/");     /* Just in case realpath doesn't */
1058                         syslog(LOG_NOTICE,
1059                             "mount request from %s for non existent path %s",
1060                             numerichost, dirpath);
1061                         if (debug)
1062                                 warnx("stat failed on %s", dirpath);
1063                         bad = ENOENT;   /* We will send error reply later */
1064                 }
1065
1066                 /* Check in the exports list */
1067                 sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
1068                 ep = ex_search(&fsb.f_fsid);
1069                 hostset = defset = 0;
1070                 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset,
1071                     &numsecflavors, &secflavorsp) ||
1072                     ((dp = dirp_search(ep->ex_dirl, dirpath)) &&
1073                       chk_host(dp, saddr, &defset, &hostset, &numsecflavors,
1074                        &secflavorsp)) ||
1075                     (defset && scan_tree(ep->ex_defdir, saddr) == 0 &&
1076                      scan_tree(ep->ex_dirl, saddr) == 0))) {
1077                         if (bad) {
1078                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
1079                                     (caddr_t)&bad))
1080                                         syslog(LOG_ERR, "can't send reply");
1081                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1082                                 return;
1083                         }
1084                         if (hostset & DP_HOSTSET) {
1085                                 fhr.fhr_flag = hostset;
1086                                 fhr.fhr_numsecflavors = numsecflavors;
1087                                 fhr.fhr_secflavors = secflavorsp;
1088                         } else {
1089                                 fhr.fhr_flag = defset;
1090                                 fhr.fhr_numsecflavors = ep->ex_defnumsecflavors;
1091                                 fhr.fhr_secflavors = ep->ex_defsecflavors;
1092                         }
1093                         fhr.fhr_vers = rqstp->rq_vers;
1094                         /* Get the file handle */
1095                         memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t));
1096                         if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) {
1097                                 bad = errno;
1098                                 syslog(LOG_ERR, "can't get fh for %s", dirpath);
1099                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
1100                                     (caddr_t)&bad))
1101                                         syslog(LOG_ERR, "can't send reply");
1102                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1103                                 return;
1104                         }
1105                         if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs,
1106                             (caddr_t)&fhr))
1107                                 syslog(LOG_ERR, "can't send reply");
1108                         if (!lookup_failed)
1109                                 add_mlist(host, dirpath);
1110                         else
1111                                 add_mlist(numerichost, dirpath);
1112                         if (debug)
1113                                 warnx("mount successful");
1114                         if (dolog)
1115                                 syslog(LOG_NOTICE,
1116                                     "mount request succeeded from %s for %s",
1117                                     numerichost, dirpath);
1118                 } else {
1119                         bad = EACCES;
1120                         syslog(LOG_NOTICE,
1121                             "mount request denied from %s for %s",
1122                             numerichost, dirpath);
1123                 }
1124
1125                 if (bad && !svc_sendreply(transp, (xdrproc_t)xdr_long,
1126                     (caddr_t)&bad))
1127                         syslog(LOG_ERR, "can't send reply");
1128                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1129                 return;
1130         case MOUNTPROC_DUMP:
1131                 if (!svc_sendreply(transp, (xdrproc_t)xdr_mlist, (caddr_t)NULL))
1132                         syslog(LOG_ERR, "can't send reply");
1133                 else if (dolog)
1134                         syslog(LOG_NOTICE,
1135                             "dump request succeeded from %s",
1136                             numerichost);
1137                 return;
1138         case MOUNTPROC_UMNT:
1139                 if (sport >= IPPORT_RESERVED && resvport_only) {
1140                         syslog(LOG_NOTICE,
1141                             "umount request from %s from unprivileged port",
1142                             numerichost);
1143                         svcerr_weakauth(transp);
1144                         return;
1145                 }
1146                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
1147                         syslog(LOG_NOTICE, "undecodable umount request from %s",
1148                             numerichost);
1149                         svcerr_decode(transp);
1150                         return;
1151                 }
1152                 if (realpath(rpcpath, dirpath) == NULL) {
1153                         syslog(LOG_NOTICE, "umount request from %s "
1154                             "for non existent path %s",
1155                             numerichost, dirpath);
1156                 }
1157                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL))
1158                         syslog(LOG_ERR, "can't send reply");
1159                 if (!lookup_failed)
1160                         del_mlist(host, dirpath);
1161                 del_mlist(numerichost, dirpath);
1162                 if (dolog)
1163                         syslog(LOG_NOTICE,
1164                             "umount request succeeded from %s for %s",
1165                             numerichost, dirpath);
1166                 return;
1167         case MOUNTPROC_UMNTALL:
1168                 if (sport >= IPPORT_RESERVED && resvport_only) {
1169                         syslog(LOG_NOTICE,
1170                             "umountall request from %s from unprivileged port",
1171                             numerichost);
1172                         svcerr_weakauth(transp);
1173                         return;
1174                 }
1175                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL))
1176                         syslog(LOG_ERR, "can't send reply");
1177                 if (!lookup_failed)
1178                         del_mlist(host, NULL);
1179                 del_mlist(numerichost, NULL);
1180                 if (dolog)
1181                         syslog(LOG_NOTICE,
1182                             "umountall request succeeded from %s",
1183                             numerichost);
1184                 return;
1185         case MOUNTPROC_EXPORT:
1186                 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, (caddr_t)NULL))
1187                         if (!svc_sendreply(transp, (xdrproc_t)xdr_explist_brief,
1188                             (caddr_t)NULL))
1189                                 syslog(LOG_ERR, "can't send reply");
1190                 if (dolog)
1191                         syslog(LOG_NOTICE,
1192                             "export request succeeded from %s",
1193                             numerichost);
1194                 return;
1195         default:
1196                 svcerr_noproc(transp);
1197                 return;
1198         }
1199 }
1200
1201 /*
1202  * Xdr conversion for a dirpath string
1203  */
1204 static int
1205 xdr_dir(XDR *xdrsp, char *dirp)
1206 {
1207         return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
1208 }
1209
1210 /*
1211  * Xdr routine to generate file handle reply
1212  */
1213 static int
1214 xdr_fhs(XDR *xdrsp, caddr_t cp)
1215 {
1216         struct fhreturn *fhrp = (struct fhreturn *)cp;
1217         u_long ok = 0, len, auth;
1218         int i;
1219
1220         if (!xdr_long(xdrsp, &ok))
1221                 return (0);
1222         switch (fhrp->fhr_vers) {
1223         case 1:
1224                 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH));
1225         case 3:
1226                 len = NFSX_V3FH;
1227                 if (!xdr_long(xdrsp, &len))
1228                         return (0);
1229                 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len))
1230                         return (0);
1231                 if (fhrp->fhr_numsecflavors) {
1232                         if (!xdr_int(xdrsp, &fhrp->fhr_numsecflavors))
1233                                 return (0);
1234                         for (i = 0; i < fhrp->fhr_numsecflavors; i++)
1235                                 if (!xdr_int(xdrsp, &fhrp->fhr_secflavors[i]))
1236                                         return (0);
1237                         return (1);
1238                 } else {
1239                         auth = AUTH_SYS;
1240                         len = 1;
1241                         if (!xdr_long(xdrsp, &len))
1242                                 return (0);
1243                         return (xdr_long(xdrsp, &auth));
1244                 }
1245         }
1246         return (0);
1247 }
1248
1249 static int
1250 xdr_mlist(XDR *xdrsp, caddr_t cp __unused)
1251 {
1252         struct mountlist *mlp;
1253         int true = 1;
1254         int false = 0;
1255         char *strp;
1256
1257         SLIST_FOREACH(mlp, &mlhead, next) {
1258                 if (!xdr_bool(xdrsp, &true))
1259                         return (0);
1260                 strp = &mlp->ml_host[0];
1261                 if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
1262                         return (0);
1263                 strp = &mlp->ml_dirp[0];
1264                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1265                         return (0);
1266         }
1267         if (!xdr_bool(xdrsp, &false))
1268                 return (0);
1269         return (1);
1270 }
1271
1272 /*
1273  * Xdr conversion for export list
1274  */
1275 static int
1276 xdr_explist_common(XDR *xdrsp, caddr_t cp __unused, int brief)
1277 {
1278         struct exportlist *ep;
1279         int false = 0;
1280         int putdef;
1281         sigset_t sighup_mask;
1282
1283         sigemptyset(&sighup_mask);
1284         sigaddset(&sighup_mask, SIGHUP);
1285         sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
1286
1287         SLIST_FOREACH(ep, &exphead, entries) {
1288                 putdef = 0;
1289                 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir,
1290                                &putdef, brief))
1291                         goto errout;
1292                 if (ep->ex_defdir && putdef == 0 &&
1293                         put_exlist(ep->ex_defdir, xdrsp, (struct dirlist *)NULL,
1294                         &putdef, brief))
1295                         goto errout;
1296         }
1297         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1298         if (!xdr_bool(xdrsp, &false))
1299                 return (0);
1300         return (1);
1301 errout:
1302         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1303         return (0);
1304 }
1305
1306 /*
1307  * Called from xdr_explist() to traverse the tree and export the
1308  * directory paths.
1309  */
1310 static int
1311 put_exlist(struct dirlist *dp, XDR *xdrsp, struct dirlist *adp, int *putdefp,
1312         int brief)
1313 {
1314         struct grouplist *grp;
1315         struct hostlist *hp;
1316         int true = 1;
1317         int false = 0;
1318         int gotalldir = 0;
1319         char *strp;
1320
1321         if (dp) {
1322                 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp, brief))
1323                         return (1);
1324                 if (!xdr_bool(xdrsp, &true))
1325                         return (1);
1326                 strp = dp->dp_dirp;
1327                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1328                         return (1);
1329                 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) {
1330                         gotalldir = 1;
1331                         *putdefp = 1;
1332                 }
1333                 if (brief) {
1334                         if (!xdr_bool(xdrsp, &true))
1335                                 return (1);
1336                         strp = "(...)";
1337                         if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1338                                 return (1);
1339                 } else if ((dp->dp_flag & DP_DEFSET) == 0 &&
1340                     (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) {
1341                         hp = dp->dp_hosts;
1342                         while (hp) {
1343                                 grp = hp->ht_grp;
1344                                 if (grp->gr_type == GT_HOST) {
1345                                         if (!xdr_bool(xdrsp, &true))
1346                                                 return (1);
1347                                         strp = grp->gr_ptr.gt_addrinfo->ai_canonname;
1348                                         if (!xdr_string(xdrsp, &strp,
1349                                             MNTNAMLEN))
1350                                                 return (1);
1351                                 } else if (grp->gr_type == GT_NET) {
1352                                         if (!xdr_bool(xdrsp, &true))
1353                                                 return (1);
1354                                         strp = grp->gr_ptr.gt_net.nt_name;
1355                                         if (!xdr_string(xdrsp, &strp,
1356                                             MNTNAMLEN))
1357                                                 return (1);
1358                                 }
1359                                 hp = hp->ht_next;
1360                                 if (gotalldir && hp == (struct hostlist *)NULL) {
1361                                         hp = adp->dp_hosts;
1362                                         gotalldir = 0;
1363                                 }
1364                         }
1365                 }
1366                 if (!xdr_bool(xdrsp, &false))
1367                         return (1);
1368                 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp, brief))
1369                         return (1);
1370         }
1371         return (0);
1372 }
1373
1374 static int
1375 xdr_explist(XDR *xdrsp, caddr_t cp)
1376 {
1377
1378         return xdr_explist_common(xdrsp, cp, 0);
1379 }
1380
1381 static int
1382 xdr_explist_brief(XDR *xdrsp, caddr_t cp)
1383 {
1384
1385         return xdr_explist_common(xdrsp, cp, 1);
1386 }
1387
1388 static char *line;
1389 static size_t linesize;
1390 static FILE *exp_file;
1391
1392 /*
1393  * Get the export list from one, currently open file
1394  */
1395 static void
1396 get_exportlist_one(void)
1397 {
1398         struct exportlist *ep;
1399         struct grouplist *grp, *tgrp;
1400         struct dirlist *dirhead;
1401         struct statfs fsb;
1402         struct xucred anon;
1403         char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc;
1404         int len, has_host, exflags, got_nondir, dirplen, netgrp;
1405
1406         v4root_phase = 0;
1407         dirhead = (struct dirlist *)NULL;
1408         while (get_line()) {
1409                 if (debug)
1410                         warnx("got line %s", line);
1411                 cp = line;
1412                 nextfield(&cp, &endcp);
1413                 if (*cp == '#')
1414                         goto nextline;
1415
1416                 /*
1417                  * Set defaults.
1418                  */
1419                 has_host = FALSE;
1420                 anon = def_anon;
1421                 exflags = MNT_EXPORTED;
1422                 got_nondir = 0;
1423                 opt_flags = 0;
1424                 ep = (struct exportlist *)NULL;
1425                 dirp = NULL;
1426
1427                 /*
1428                  * Handle the V4 root dir.
1429                  */
1430                 if (*cp == 'V' && *(cp + 1) == '4' && *(cp + 2) == ':') {
1431                         /*
1432                          * V4: just indicates that it is the v4 root point,
1433                          * so skip over that and set v4root_phase.
1434                          */
1435                         if (v4root_phase > 0) {
1436                                 syslog(LOG_ERR, "V4:duplicate line, ignored");
1437                                 goto nextline;
1438                         }
1439                         v4root_phase = 1;
1440                         cp += 3;
1441                         nextfield(&cp, &endcp);
1442                 }
1443
1444                 /*
1445                  * Create new exports list entry
1446                  */
1447                 len = endcp-cp;
1448                 tgrp = grp = get_grp();
1449                 while (len > 0) {
1450                         if (len > MNTNAMLEN) {
1451                             getexp_err(ep, tgrp);
1452                             goto nextline;
1453                         }
1454                         if (*cp == '-') {
1455                             if (ep == (struct exportlist *)NULL) {
1456                                 getexp_err(ep, tgrp);
1457                                 goto nextline;
1458                             }
1459                             if (debug)
1460                                 warnx("doing opt %s", cp);
1461                             got_nondir = 1;
1462                             if (do_opt(&cp, &endcp, ep, grp, &has_host,
1463                                 &exflags, &anon)) {
1464                                 getexp_err(ep, tgrp);
1465                                 goto nextline;
1466                             }
1467                         } else if (*cp == '/') {
1468                             savedc = *endcp;
1469                             *endcp = '\0';
1470                             if (v4root_phase > 1) {
1471                                     if (dirp != NULL) {
1472                                         syslog(LOG_ERR, "Multiple V4 dirs");
1473                                         getexp_err(ep, tgrp);
1474                                         goto nextline;
1475                                     }
1476                             }
1477                             if (check_dirpath(cp) &&
1478                                 statfs(cp, &fsb) >= 0) {
1479                                 if ((fsb.f_flags & MNT_AUTOMOUNTED) != 0)
1480                                     syslog(LOG_ERR, "Warning: exporting of "
1481                                         "automounted fs %s not supported", cp);
1482                                 if (got_nondir) {
1483                                     syslog(LOG_ERR, "dirs must be first");
1484                                     getexp_err(ep, tgrp);
1485                                     goto nextline;
1486                                 }
1487                                 if (v4root_phase == 1) {
1488                                     if (dirp != NULL) {
1489                                         syslog(LOG_ERR, "Multiple V4 dirs");
1490                                         getexp_err(ep, tgrp);
1491                                         goto nextline;
1492                                     }
1493                                     if (strlen(v4root_dirpath) == 0) {
1494                                         strlcpy(v4root_dirpath, cp,
1495                                             sizeof (v4root_dirpath));
1496                                     } else if (strcmp(v4root_dirpath, cp)
1497                                         != 0) {
1498                                         syslog(LOG_ERR,
1499                                             "different V4 dirpath %s", cp);
1500                                         getexp_err(ep, tgrp);
1501                                         goto nextline;
1502                                     }
1503                                     dirp = cp;
1504                                     v4root_phase = 2;
1505                                     got_nondir = 1;
1506                                     ep = get_exp();
1507                                 } else {
1508                                     if (ep) {
1509                                         if (ep->ex_fs.val[0] !=
1510                                             fsb.f_fsid.val[0] ||
1511                                             ep->ex_fs.val[1] !=
1512                                             fsb.f_fsid.val[1]) {
1513                                                 getexp_err(ep, tgrp);
1514                                                 goto nextline;
1515                                         }
1516                                     } else {
1517                                         /*
1518                                          * See if this directory is already
1519                                          * in the list.
1520                                          */
1521                                         ep = ex_search(&fsb.f_fsid);
1522                                         if (ep == (struct exportlist *)NULL) {
1523                                             ep = get_exp();
1524                                             ep->ex_fs = fsb.f_fsid;
1525                                             ep->ex_fsdir = strdup(fsb.f_mntonname);
1526                                             if (ep->ex_fsdir == NULL)
1527                                                 out_of_mem();
1528                                             if (debug)
1529                                                 warnx(
1530                                                   "making new ep fs=0x%x,0x%x",
1531                                                   fsb.f_fsid.val[0],
1532                                                   fsb.f_fsid.val[1]);
1533                                         } else if (debug)
1534                                             warnx("found ep fs=0x%x,0x%x",
1535                                                 fsb.f_fsid.val[0],
1536                                                 fsb.f_fsid.val[1]);
1537                                     }
1538
1539                                     /*
1540                                      * Add dirpath to export mount point.
1541                                      */
1542                                     dirp = add_expdir(&dirhead, cp, len);
1543                                     dirplen = len;
1544                                 }
1545                             } else {
1546                                 getexp_err(ep, tgrp);
1547                                 goto nextline;
1548                             }
1549                             *endcp = savedc;
1550                         } else {
1551                             savedc = *endcp;
1552                             *endcp = '\0';
1553                             got_nondir = 1;
1554                             if (ep == (struct exportlist *)NULL) {
1555                                 getexp_err(ep, tgrp);
1556                                 goto nextline;
1557                             }
1558
1559                             /*
1560                              * Get the host or netgroup.
1561                              */
1562                             setnetgrent(cp);
1563                             netgrp = getnetgrent(&hst, &usr, &dom);
1564                             do {
1565                                 if (has_host) {
1566                                     grp->gr_next = get_grp();
1567                                     grp = grp->gr_next;
1568                                 }
1569                                 if (netgrp) {
1570                                     if (hst == 0) {
1571                                         syslog(LOG_ERR,
1572                                 "null hostname in netgroup %s, skipping", cp);
1573                                         grp->gr_type = GT_IGNORE;
1574                                     } else if (get_host(hst, grp, tgrp)) {
1575                                         syslog(LOG_ERR,
1576                         "bad host %s in netgroup %s, skipping", hst, cp);
1577                                         grp->gr_type = GT_IGNORE;
1578                                     }
1579                                 } else if (get_host(cp, grp, tgrp)) {
1580                                     syslog(LOG_ERR, "bad host %s, skipping", cp);
1581                                     grp->gr_type = GT_IGNORE;
1582                                 }
1583                                 has_host = TRUE;
1584                             } while (netgrp && getnetgrent(&hst, &usr, &dom));
1585                             endnetgrent();
1586                             *endcp = savedc;
1587                         }
1588                         cp = endcp;
1589                         nextfield(&cp, &endcp);
1590                         len = endcp - cp;
1591                 }
1592                 if (check_options(dirhead)) {
1593                         getexp_err(ep, tgrp);
1594                         goto nextline;
1595                 }
1596                 if (!has_host) {
1597                         grp->gr_type = GT_DEFAULT;
1598                         if (debug)
1599                                 warnx("adding a default entry");
1600
1601                 /*
1602                  * Don't allow a network export coincide with a list of
1603                  * host(s) on the same line.
1604                  */
1605                 } else if ((opt_flags & OP_NET) && tgrp->gr_next) {
1606                         syslog(LOG_ERR, "network/host conflict");
1607                         getexp_err(ep, tgrp);
1608                         goto nextline;
1609
1610                 /*
1611                  * If an export list was specified on this line, make sure
1612                  * that we have at least one valid entry, otherwise skip it.
1613                  */
1614                 } else {
1615                         grp = tgrp;
1616                         while (grp && grp->gr_type == GT_IGNORE)
1617                                 grp = grp->gr_next;
1618                         if (! grp) {
1619                             getexp_err(ep, tgrp);
1620                             goto nextline;
1621                         }
1622                 }
1623
1624                 if (v4root_phase == 1) {
1625                         syslog(LOG_ERR, "V4:root, no dirp, ignored");
1626                         getexp_err(ep, tgrp);
1627                         goto nextline;
1628                 }
1629
1630                 /*
1631                  * Loop through hosts, pushing the exports into the kernel.
1632                  * After loop, tgrp points to the start of the list and
1633                  * grp points to the last entry in the list.
1634                  */
1635                 grp = tgrp;
1636                 do {
1637                         if (do_mount(ep, grp, exflags, &anon, dirp, dirplen,
1638                             &fsb)) {
1639                                 getexp_err(ep, tgrp);
1640                                 goto nextline;
1641                         }
1642                 } while (grp->gr_next && (grp = grp->gr_next));
1643
1644                 /*
1645                  * For V4: don't enter in mount lists.
1646                  */
1647                 if (v4root_phase > 0 && v4root_phase <= 2) {
1648                         /*
1649                          * Since these structures aren't used by mountd,
1650                          * free them up now.
1651                          */
1652                         if (ep != NULL)
1653                                 free_exp(ep);
1654                         while (tgrp != NULL) {
1655                                 grp = tgrp;
1656                                 tgrp = tgrp->gr_next;
1657                                 free_grp(grp);
1658                         }
1659                         goto nextline;
1660                 }
1661
1662                 /*
1663                  * Success. Update the data structures.
1664                  */
1665                 if (has_host) {
1666                         hang_dirp(dirhead, tgrp, ep, opt_flags);
1667                         grp->gr_next = grphead;
1668                         grphead = tgrp;
1669                 } else {
1670                         hang_dirp(dirhead, (struct grouplist *)NULL, ep,
1671                                 opt_flags);
1672                         free_grp(grp);
1673                 }
1674                 dirhead = (struct dirlist *)NULL;
1675                 if ((ep->ex_flag & EX_LINKED) == 0) {
1676                         SLIST_INSERT_HEAD(&exphead, ep, entries);
1677
1678                         ep->ex_flag |= EX_LINKED;
1679                 }
1680 nextline:
1681                 v4root_phase = 0;
1682                 if (dirhead) {
1683                         free_dir(dirhead);
1684                         dirhead = (struct dirlist *)NULL;
1685                 }
1686         }
1687 }
1688
1689 /*
1690  * Get the export list from all specified files
1691  */
1692 static void
1693 get_exportlist(void)
1694 {
1695         struct exportlist *ep, *ep2;
1696         struct grouplist *grp, *tgrp;
1697         struct export_args export;
1698         struct iovec *iov;
1699         struct statfs *fsp, *mntbufp;
1700         struct xvfsconf vfc;
1701         char errmsg[255];
1702         int num, i;
1703         int iovlen;
1704         int done;
1705         struct nfsex_args eargs;
1706
1707         if (suspend_nfsd != 0)
1708                 (void)nfssvc(NFSSVC_SUSPENDNFSD, NULL);
1709         v4root_dirpath[0] = '\0';
1710         bzero(&export, sizeof(export));
1711         export.ex_flags = MNT_DELEXPORT;
1712         iov = NULL;
1713         iovlen = 0;
1714         bzero(errmsg, sizeof(errmsg));
1715
1716         /*
1717          * First, get rid of the old list
1718          */
1719         SLIST_FOREACH_SAFE(ep, &exphead, entries, ep2) {
1720                 SLIST_REMOVE(&exphead, ep, exportlist, entries);
1721                 free_exp(ep);
1722         }
1723
1724         grp = grphead;
1725         while (grp) {
1726                 tgrp = grp;
1727                 grp = grp->gr_next;
1728                 free_grp(tgrp);
1729         }
1730         grphead = (struct grouplist *)NULL;
1731
1732         /*
1733          * and the old V4 root dir.
1734          */
1735         bzero(&eargs, sizeof (eargs));
1736         eargs.export.ex_flags = MNT_DELEXPORT;
1737         if (nfssvc(NFSSVC_V4ROOTEXPORT, (caddr_t)&eargs) < 0 &&
1738             errno != ENOENT)
1739                 syslog(LOG_ERR, "Can't delete exports for V4:");
1740
1741         /*
1742          * and clear flag that notes if a public fh has been exported.
1743          */
1744         has_publicfh = 0;
1745
1746         /*
1747          * And delete exports that are in the kernel for all local
1748          * filesystems.
1749          * XXX: Should know how to handle all local exportable filesystems.
1750          */
1751         num = getmntinfo(&mntbufp, MNT_NOWAIT);
1752
1753         if (num > 0) {
1754                 build_iovec(&iov, &iovlen, "fstype", NULL, 0);
1755                 build_iovec(&iov, &iovlen, "fspath", NULL, 0);
1756                 build_iovec(&iov, &iovlen, "from", NULL, 0);
1757                 build_iovec(&iov, &iovlen, "update", NULL, 0);
1758                 build_iovec(&iov, &iovlen, "export", &export, sizeof(export));
1759                 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
1760         }
1761
1762         for (i = 0; i < num; i++) {
1763                 fsp = &mntbufp[i];
1764                 if (getvfsbyname(fsp->f_fstypename, &vfc) != 0) {
1765                         syslog(LOG_ERR, "getvfsbyname() failed for %s",
1766                             fsp->f_fstypename);
1767                         continue;
1768                 }
1769
1770                 /*
1771                  * We do not need to delete "export" flag from
1772                  * filesystems that do not have it set.
1773                  */
1774                 if (!(fsp->f_flags & MNT_EXPORTED))
1775                     continue;
1776                 /*
1777                  * Do not delete export for network filesystem by
1778                  * passing "export" arg to nmount().
1779                  * It only makes sense to do this for local filesystems.
1780                  */
1781                 if (vfc.vfc_flags & VFCF_NETWORK)
1782                         continue;
1783
1784                 iov[1].iov_base = fsp->f_fstypename;
1785                 iov[1].iov_len = strlen(fsp->f_fstypename) + 1;
1786                 iov[3].iov_base = fsp->f_mntonname;
1787                 iov[3].iov_len = strlen(fsp->f_mntonname) + 1;
1788                 iov[5].iov_base = fsp->f_mntfromname;
1789                 iov[5].iov_len = strlen(fsp->f_mntfromname) + 1;
1790                 errmsg[0] = '\0';
1791
1792                 /*
1793                  * EXDEV is returned when path exists but is not a
1794                  * mount point.  May happens if raced with unmount.
1795                  */
1796                 if (nmount(iov, iovlen, fsp->f_flags) < 0 &&
1797                     errno != ENOENT && errno != ENOTSUP && errno != EXDEV) {
1798                         syslog(LOG_ERR,
1799                             "can't delete exports for %s: %m %s",
1800                             fsp->f_mntonname, errmsg);
1801                 }
1802         }
1803
1804         if (iov != NULL) {
1805                 /* Free strings allocated by strdup() in getmntopts.c */
1806                 free(iov[0].iov_base); /* fstype */
1807                 free(iov[2].iov_base); /* fspath */
1808                 free(iov[4].iov_base); /* from */
1809                 free(iov[6].iov_base); /* update */
1810                 free(iov[8].iov_base); /* export */
1811                 free(iov[10].iov_base); /* errmsg */
1812
1813                 /* free iov, allocated by realloc() */
1814                 free(iov);
1815                 iovlen = 0;
1816         }
1817
1818         /*
1819          * Read in the exports file and build the list, calling
1820          * nmount() as we go along to push the export rules into the kernel.
1821          */
1822         done = 0;
1823         for (i = 0; exnames[i] != NULL; i++) {
1824                 if (debug)
1825                         warnx("reading exports from %s", exnames[i]);
1826                 if ((exp_file = fopen(exnames[i], "r")) == NULL) {
1827                         syslog(LOG_WARNING, "can't open %s", exnames[i]);
1828                         continue;
1829                 }
1830                 get_exportlist_one();
1831                 fclose(exp_file);
1832                 done++;
1833         }
1834         if (done == 0) {
1835                 syslog(LOG_ERR, "can't open any exports file");
1836                 exit(2);
1837         }
1838
1839         /*
1840          * If there was no public fh, clear any previous one set.
1841          */
1842         if (has_publicfh == 0)
1843                 (void) nfssvc(NFSSVC_NOPUBLICFH, NULL);
1844
1845         /* Resume the nfsd. If they weren't suspended, this is harmless. */
1846         (void)nfssvc(NFSSVC_RESUMENFSD, NULL);
1847 }
1848
1849 /*
1850  * Allocate an export list element
1851  */
1852 static struct exportlist *
1853 get_exp(void)
1854 {
1855         struct exportlist *ep;
1856
1857         ep = (struct exportlist *)calloc(1, sizeof (struct exportlist));
1858         if (ep == (struct exportlist *)NULL)
1859                 out_of_mem();
1860         return (ep);
1861 }
1862
1863 /*
1864  * Allocate a group list element
1865  */
1866 static struct grouplist *
1867 get_grp(void)
1868 {
1869         struct grouplist *gp;
1870
1871         gp = (struct grouplist *)calloc(1, sizeof (struct grouplist));
1872         if (gp == (struct grouplist *)NULL)
1873                 out_of_mem();
1874         return (gp);
1875 }
1876
1877 /*
1878  * Clean up upon an error in get_exportlist().
1879  */
1880 static void
1881 getexp_err(struct exportlist *ep, struct grouplist *grp)
1882 {
1883         struct grouplist *tgrp;
1884
1885         if (!(opt_flags & OP_QUIET))
1886                 syslog(LOG_ERR, "bad exports list line %s", line);
1887         if (ep && (ep->ex_flag & EX_LINKED) == 0)
1888                 free_exp(ep);
1889         while (grp) {
1890                 tgrp = grp;
1891                 grp = grp->gr_next;
1892                 free_grp(tgrp);
1893         }
1894 }
1895
1896 /*
1897  * Search the export list for a matching fs.
1898  */
1899 static struct exportlist *
1900 ex_search(fsid_t *fsid)
1901 {
1902         struct exportlist *ep;
1903
1904         SLIST_FOREACH(ep, &exphead, entries) {
1905                 if (ep->ex_fs.val[0] == fsid->val[0] &&
1906                     ep->ex_fs.val[1] == fsid->val[1])
1907                         return (ep);
1908         }
1909
1910         return (ep);
1911 }
1912
1913 /*
1914  * Add a directory path to the list.
1915  */
1916 static char *
1917 add_expdir(struct dirlist **dpp, char *cp, int len)
1918 {
1919         struct dirlist *dp;
1920
1921         dp = malloc(sizeof (struct dirlist));
1922         if (dp == (struct dirlist *)NULL)
1923                 out_of_mem();
1924         dp->dp_left = *dpp;
1925         dp->dp_right = (struct dirlist *)NULL;
1926         dp->dp_flag = 0;
1927         dp->dp_hosts = (struct hostlist *)NULL;
1928         dp->dp_dirp = strndup(cp, len);
1929         if (dp->dp_dirp == NULL)
1930                 out_of_mem();
1931         *dpp = dp;
1932         return (dp->dp_dirp);
1933 }
1934
1935 /*
1936  * Hang the dir list element off the dirpath binary tree as required
1937  * and update the entry for host.
1938  */
1939 static void
1940 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep,
1941         int flags)
1942 {
1943         struct hostlist *hp;
1944         struct dirlist *dp2;
1945
1946         if (flags & OP_ALLDIRS) {
1947                 if (ep->ex_defdir)
1948                         free((caddr_t)dp);
1949                 else
1950                         ep->ex_defdir = dp;
1951                 if (grp == (struct grouplist *)NULL) {
1952                         ep->ex_defdir->dp_flag |= DP_DEFSET;
1953                         /* Save the default security flavors list. */
1954                         ep->ex_defnumsecflavors = ep->ex_numsecflavors;
1955                         if (ep->ex_numsecflavors > 0)
1956                                 memcpy(ep->ex_defsecflavors, ep->ex_secflavors,
1957                                     sizeof(ep->ex_secflavors));
1958                 } else while (grp) {
1959                         hp = get_ht();
1960                         hp->ht_grp = grp;
1961                         hp->ht_next = ep->ex_defdir->dp_hosts;
1962                         ep->ex_defdir->dp_hosts = hp;
1963                         /* Save the security flavors list for this host set. */
1964                         grp->gr_numsecflavors = ep->ex_numsecflavors;
1965                         if (ep->ex_numsecflavors > 0)
1966                                 memcpy(grp->gr_secflavors, ep->ex_secflavors,
1967                                     sizeof(ep->ex_secflavors));
1968                         grp = grp->gr_next;
1969                 }
1970         } else {
1971
1972                 /*
1973                  * Loop through the directories adding them to the tree.
1974                  */
1975                 while (dp) {
1976                         dp2 = dp->dp_left;
1977                         add_dlist(&ep->ex_dirl, dp, grp, flags, ep);
1978                         dp = dp2;
1979                 }
1980         }
1981 }
1982
1983 /*
1984  * Traverse the binary tree either updating a node that is already there
1985  * for the new directory or adding the new node.
1986  */
1987 static void
1988 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp,
1989         int flags, struct exportlist *ep)
1990 {
1991         struct dirlist *dp;
1992         struct hostlist *hp;
1993         int cmp;
1994
1995         dp = *dpp;
1996         if (dp) {
1997                 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp);
1998                 if (cmp > 0) {
1999                         add_dlist(&dp->dp_left, newdp, grp, flags, ep);
2000                         return;
2001                 } else if (cmp < 0) {
2002                         add_dlist(&dp->dp_right, newdp, grp, flags, ep);
2003                         return;
2004                 } else
2005                         free((caddr_t)newdp);
2006         } else {
2007                 dp = newdp;
2008                 dp->dp_left = (struct dirlist *)NULL;
2009                 *dpp = dp;
2010         }
2011         if (grp) {
2012
2013                 /*
2014                  * Hang all of the host(s) off of the directory point.
2015                  */
2016                 do {
2017                         hp = get_ht();
2018                         hp->ht_grp = grp;
2019                         hp->ht_next = dp->dp_hosts;
2020                         dp->dp_hosts = hp;
2021                         /* Save the security flavors list for this host set. */
2022                         grp->gr_numsecflavors = ep->ex_numsecflavors;
2023                         if (ep->ex_numsecflavors > 0)
2024                                 memcpy(grp->gr_secflavors, ep->ex_secflavors,
2025                                     sizeof(ep->ex_secflavors));
2026                         grp = grp->gr_next;
2027                 } while (grp);
2028         } else {
2029                 dp->dp_flag |= DP_DEFSET;
2030                 /* Save the default security flavors list. */
2031                 ep->ex_defnumsecflavors = ep->ex_numsecflavors;
2032                 if (ep->ex_numsecflavors > 0)
2033                         memcpy(ep->ex_defsecflavors, ep->ex_secflavors,
2034                             sizeof(ep->ex_secflavors));
2035         }
2036 }
2037
2038 /*
2039  * Search for a dirpath on the export point.
2040  */
2041 static struct dirlist *
2042 dirp_search(struct dirlist *dp, char *dirp)
2043 {
2044         int cmp;
2045
2046         if (dp) {
2047                 cmp = strcmp(dp->dp_dirp, dirp);
2048                 if (cmp > 0)
2049                         return (dirp_search(dp->dp_left, dirp));
2050                 else if (cmp < 0)
2051                         return (dirp_search(dp->dp_right, dirp));
2052                 else
2053                         return (dp);
2054         }
2055         return (dp);
2056 }
2057
2058 /*
2059  * Scan for a host match in a directory tree.
2060  */
2061 static int
2062 chk_host(struct dirlist *dp, struct sockaddr *saddr, int *defsetp,
2063         int *hostsetp, int *numsecflavors, int **secflavorsp)
2064 {
2065         struct hostlist *hp;
2066         struct grouplist *grp;
2067         struct addrinfo *ai;
2068
2069         if (dp) {
2070                 if (dp->dp_flag & DP_DEFSET)
2071                         *defsetp = dp->dp_flag;
2072                 hp = dp->dp_hosts;
2073                 while (hp) {
2074                         grp = hp->ht_grp;
2075                         switch (grp->gr_type) {
2076                         case GT_HOST:
2077                                 ai = grp->gr_ptr.gt_addrinfo;
2078                                 for (; ai; ai = ai->ai_next) {
2079                                         if (!sacmp(ai->ai_addr, saddr, NULL)) {
2080                                                 *hostsetp =
2081                                                     (hp->ht_flag | DP_HOSTSET);
2082                                                 if (numsecflavors != NULL) {
2083                                                         *numsecflavors =
2084                                                             grp->gr_numsecflavors;
2085                                                         *secflavorsp =
2086                                                             grp->gr_secflavors;
2087                                                 }
2088                                                 return (1);
2089                                         }
2090                                 }
2091                                 break;
2092                         case GT_NET:
2093                                 if (!sacmp(saddr, (struct sockaddr *)
2094                                     &grp->gr_ptr.gt_net.nt_net,
2095                                     (struct sockaddr *)
2096                                     &grp->gr_ptr.gt_net.nt_mask)) {
2097                                         *hostsetp = (hp->ht_flag | DP_HOSTSET);
2098                                         if (numsecflavors != NULL) {
2099                                                 *numsecflavors =
2100                                                     grp->gr_numsecflavors;
2101                                                 *secflavorsp =
2102                                                     grp->gr_secflavors;
2103                                         }
2104                                         return (1);
2105                                 }
2106                                 break;
2107                         }
2108                         hp = hp->ht_next;
2109                 }
2110         }
2111         return (0);
2112 }
2113
2114 /*
2115  * Scan tree for a host that matches the address.
2116  */
2117 static int
2118 scan_tree(struct dirlist *dp, struct sockaddr *saddr)
2119 {
2120         int defset, hostset;
2121
2122         if (dp) {
2123                 if (scan_tree(dp->dp_left, saddr))
2124                         return (1);
2125                 if (chk_host(dp, saddr, &defset, &hostset, NULL, NULL))
2126                         return (1);
2127                 if (scan_tree(dp->dp_right, saddr))
2128                         return (1);
2129         }
2130         return (0);
2131 }
2132
2133 /*
2134  * Traverse the dirlist tree and free it up.
2135  */
2136 static void
2137 free_dir(struct dirlist *dp)
2138 {
2139
2140         if (dp) {
2141                 free_dir(dp->dp_left);
2142                 free_dir(dp->dp_right);
2143                 free_host(dp->dp_hosts);
2144                 free(dp->dp_dirp);
2145                 free(dp);
2146         }
2147 }
2148
2149 /*
2150  * Parse a colon separated list of security flavors
2151  */
2152 static int
2153 parsesec(char *seclist, struct exportlist *ep)
2154 {
2155         char *cp, savedc;
2156         int flavor;
2157
2158         ep->ex_numsecflavors = 0;
2159         for (;;) {
2160                 cp = strchr(seclist, ':');
2161                 if (cp) {
2162                         savedc = *cp;
2163                         *cp = '\0';
2164                 }
2165
2166                 if (!strcmp(seclist, "sys"))
2167                         flavor = AUTH_SYS;
2168                 else if (!strcmp(seclist, "krb5"))
2169                         flavor = RPCSEC_GSS_KRB5;
2170                 else if (!strcmp(seclist, "krb5i"))
2171                         flavor = RPCSEC_GSS_KRB5I;
2172                 else if (!strcmp(seclist, "krb5p"))
2173                         flavor = RPCSEC_GSS_KRB5P;
2174                 else {
2175                         if (cp)
2176                                 *cp = savedc;
2177                         syslog(LOG_ERR, "bad sec flavor: %s", seclist);
2178                         return (1);
2179                 }
2180                 if (ep->ex_numsecflavors == MAXSECFLAVORS) {
2181                         if (cp)
2182                                 *cp = savedc;
2183                         syslog(LOG_ERR, "too many sec flavors: %s", seclist);
2184                         return (1);
2185                 }
2186                 ep->ex_secflavors[ep->ex_numsecflavors] = flavor;
2187                 ep->ex_numsecflavors++;
2188                 if (cp) {
2189                         *cp = savedc;
2190                         seclist = cp + 1;
2191                 } else {
2192                         break;
2193                 }
2194         }
2195         return (0);
2196 }
2197
2198 /*
2199  * Parse the option string and update fields.
2200  * Option arguments may either be -<option>=<value> or
2201  * -<option> <value>
2202  */
2203 static int
2204 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp,
2205         int *has_hostp, int *exflagsp, struct xucred *cr)
2206 {
2207         char *cpoptarg, *cpoptend;
2208         char *cp, *endcp, *cpopt, savedc, savedc2;
2209         int allflag, usedarg;
2210
2211         savedc2 = '\0';
2212         cpopt = *cpp;
2213         cpopt++;
2214         cp = *endcpp;
2215         savedc = *cp;
2216         *cp = '\0';
2217         while (cpopt && *cpopt) {
2218                 allflag = 1;
2219                 usedarg = -2;
2220                 if ((cpoptend = strchr(cpopt, ','))) {
2221                         *cpoptend++ = '\0';
2222                         if ((cpoptarg = strchr(cpopt, '=')))
2223                                 *cpoptarg++ = '\0';
2224                 } else {
2225                         if ((cpoptarg = strchr(cpopt, '=')))
2226                                 *cpoptarg++ = '\0';
2227                         else {
2228                                 *cp = savedc;
2229                                 nextfield(&cp, &endcp);
2230                                 **endcpp = '\0';
2231                                 if (endcp > cp && *cp != '-') {
2232                                         cpoptarg = cp;
2233                                         savedc2 = *endcp;
2234                                         *endcp = '\0';
2235                                         usedarg = 0;
2236                                 }
2237                         }
2238                 }
2239                 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) {
2240                         *exflagsp |= MNT_EXRDONLY;
2241                 } else if (cpoptarg && (!strcmp(cpopt, "maproot") ||
2242                     !(allflag = strcmp(cpopt, "mapall")) ||
2243                     !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) {
2244                         usedarg++;
2245                         parsecred(cpoptarg, cr);
2246                         if (allflag == 0) {
2247                                 *exflagsp |= MNT_EXPORTANON;
2248                                 opt_flags |= OP_MAPALL;
2249                         } else
2250                                 opt_flags |= OP_MAPROOT;
2251                 } else if (cpoptarg && (!strcmp(cpopt, "mask") ||
2252                     !strcmp(cpopt, "m"))) {
2253                         if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) {
2254                                 syslog(LOG_ERR, "bad mask: %s", cpoptarg);
2255                                 return (1);
2256                         }
2257                         usedarg++;
2258                         opt_flags |= OP_MASK;
2259                 } else if (cpoptarg && (!strcmp(cpopt, "network") ||
2260                         !strcmp(cpopt, "n"))) {
2261                         if (strchr(cpoptarg, '/') != NULL) {
2262                                 if (debug)
2263                                         fprintf(stderr, "setting OP_MASKLEN\n");
2264                                 opt_flags |= OP_MASKLEN;
2265                         }
2266                         if (grp->gr_type != GT_NULL) {
2267                                 syslog(LOG_ERR, "network/host conflict");
2268                                 return (1);
2269                         } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) {
2270                                 syslog(LOG_ERR, "bad net: %s", cpoptarg);
2271                                 return (1);
2272                         }
2273                         grp->gr_type = GT_NET;
2274                         *has_hostp = 1;
2275                         usedarg++;
2276                         opt_flags |= OP_NET;
2277                 } else if (!strcmp(cpopt, "alldirs")) {
2278                         opt_flags |= OP_ALLDIRS;
2279                 } else if (!strcmp(cpopt, "public")) {
2280                         *exflagsp |= MNT_EXPUBLIC;
2281                 } else if (!strcmp(cpopt, "webnfs")) {
2282                         *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON);
2283                         opt_flags |= OP_MAPALL;
2284                 } else if (cpoptarg && !strcmp(cpopt, "index")) {
2285                         ep->ex_indexfile = strdup(cpoptarg);
2286                 } else if (!strcmp(cpopt, "quiet")) {
2287                         opt_flags |= OP_QUIET;
2288                 } else if (cpoptarg && !strcmp(cpopt, "sec")) {
2289                         if (parsesec(cpoptarg, ep))
2290                                 return (1);
2291                         opt_flags |= OP_SEC;
2292                         usedarg++;
2293                 } else {
2294                         syslog(LOG_ERR, "bad opt %s", cpopt);
2295                         return (1);
2296                 }
2297                 if (usedarg >= 0) {
2298                         *endcp = savedc2;
2299                         **endcpp = savedc;
2300                         if (usedarg > 0) {
2301                                 *cpp = cp;
2302                                 *endcpp = endcp;
2303                         }
2304                         return (0);
2305                 }
2306                 cpopt = cpoptend;
2307         }
2308         **endcpp = savedc;
2309         return (0);
2310 }
2311
2312 /*
2313  * Translate a character string to the corresponding list of network
2314  * addresses for a hostname.
2315  */
2316 static int
2317 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp)
2318 {
2319         struct grouplist *checkgrp;
2320         struct addrinfo *ai, *tai, hints;
2321         int ecode;
2322         char host[NI_MAXHOST];
2323
2324         if (grp->gr_type != GT_NULL) {
2325                 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp);
2326                 return (1);
2327         }
2328         memset(&hints, 0, sizeof hints);
2329         hints.ai_flags = AI_CANONNAME;
2330         hints.ai_protocol = IPPROTO_UDP;
2331         ecode = getaddrinfo(cp, NULL, &hints, &ai);
2332         if (ecode != 0) {
2333                 syslog(LOG_ERR,"can't get address info for host %s", cp);
2334                 return 1;
2335         }
2336         grp->gr_ptr.gt_addrinfo = ai;
2337         while (ai != NULL) {
2338                 if (ai->ai_canonname == NULL) {
2339                         if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host,
2340                             sizeof host, NULL, 0, NI_NUMERICHOST) != 0)
2341                                 strlcpy(host, "?", sizeof(host));
2342                         ai->ai_canonname = strdup(host);
2343                         ai->ai_flags |= AI_CANONNAME;
2344                 }
2345                 if (debug)
2346                         fprintf(stderr, "got host %s\n", ai->ai_canonname);
2347                 /*
2348                  * Sanity check: make sure we don't already have an entry
2349                  * for this host in the grouplist.
2350                  */
2351                 for (checkgrp = tgrp; checkgrp != NULL;
2352                     checkgrp = checkgrp->gr_next) {
2353                         if (checkgrp->gr_type != GT_HOST)
2354                                 continue;
2355                         for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL;
2356                             tai = tai->ai_next) {
2357                                 if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0)
2358                                         continue;
2359                                 if (debug)
2360                                         fprintf(stderr,
2361                                             "ignoring duplicate host %s\n",
2362                                             ai->ai_canonname);
2363                                 grp->gr_type = GT_IGNORE;
2364                                 return (0);
2365                         }
2366                 }
2367                 ai = ai->ai_next;
2368         }
2369         grp->gr_type = GT_HOST;
2370         return (0);
2371 }
2372
2373 /*
2374  * Free up an exports list component
2375  */
2376 static void
2377 free_exp(struct exportlist *ep)
2378 {
2379
2380         if (ep->ex_defdir) {
2381                 free_host(ep->ex_defdir->dp_hosts);
2382                 free((caddr_t)ep->ex_defdir);
2383         }
2384         if (ep->ex_fsdir)
2385                 free(ep->ex_fsdir);
2386         if (ep->ex_indexfile)
2387                 free(ep->ex_indexfile);
2388         free_dir(ep->ex_dirl);
2389         free((caddr_t)ep);
2390 }
2391
2392 /*
2393  * Free hosts.
2394  */
2395 static void
2396 free_host(struct hostlist *hp)
2397 {
2398         struct hostlist *hp2;
2399
2400         while (hp) {
2401                 hp2 = hp;
2402                 hp = hp->ht_next;
2403                 free((caddr_t)hp2);
2404         }
2405 }
2406
2407 static struct hostlist *
2408 get_ht(void)
2409 {
2410         struct hostlist *hp;
2411
2412         hp = (struct hostlist *)malloc(sizeof (struct hostlist));
2413         if (hp == (struct hostlist *)NULL)
2414                 out_of_mem();
2415         hp->ht_next = (struct hostlist *)NULL;
2416         hp->ht_flag = 0;
2417         return (hp);
2418 }
2419
2420 /*
2421  * Out of memory, fatal
2422  */
2423 static void
2424 out_of_mem(void)
2425 {
2426
2427         syslog(LOG_ERR, "out of memory");
2428         exit(2);
2429 }
2430
2431 /*
2432  * Do the nmount() syscall with the update flag to push the export info into
2433  * the kernel.
2434  */
2435 static int
2436 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags,
2437     struct xucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb)
2438 {
2439         struct statfs fsb1;
2440         struct addrinfo *ai;
2441         struct export_args *eap;
2442         char errmsg[255];
2443         char *cp;
2444         int done;
2445         char savedc;
2446         struct iovec *iov;
2447         int i, iovlen;
2448         int ret;
2449         struct nfsex_args nfsea;
2450
2451         eap = &nfsea.export;
2452
2453         cp = NULL;
2454         savedc = '\0';
2455         iov = NULL;
2456         iovlen = 0;
2457         ret = 0;
2458
2459         bzero(eap, sizeof (struct export_args));
2460         bzero(errmsg, sizeof(errmsg));
2461         eap->ex_flags = exflags;
2462         eap->ex_anon = *anoncrp;
2463         eap->ex_indexfile = ep->ex_indexfile;
2464         if (grp->gr_type == GT_HOST)
2465                 ai = grp->gr_ptr.gt_addrinfo;
2466         else
2467                 ai = NULL;
2468         eap->ex_numsecflavors = ep->ex_numsecflavors;
2469         for (i = 0; i < eap->ex_numsecflavors; i++)
2470                 eap->ex_secflavors[i] = ep->ex_secflavors[i];
2471         if (eap->ex_numsecflavors == 0) {
2472                 eap->ex_numsecflavors = 1;
2473                 eap->ex_secflavors[0] = AUTH_SYS;
2474         }
2475         done = FALSE;
2476
2477         if (v4root_phase == 0) {
2478                 build_iovec(&iov, &iovlen, "fstype", NULL, 0);
2479                 build_iovec(&iov, &iovlen, "fspath", NULL, 0);
2480                 build_iovec(&iov, &iovlen, "from", NULL, 0);
2481                 build_iovec(&iov, &iovlen, "update", NULL, 0);
2482                 build_iovec(&iov, &iovlen, "export", eap,
2483                     sizeof (struct export_args));
2484                 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
2485         }
2486
2487         while (!done) {
2488                 switch (grp->gr_type) {
2489                 case GT_HOST:
2490                         if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0)
2491                                 goto skip;
2492                         eap->ex_addr = ai->ai_addr;
2493                         eap->ex_addrlen = ai->ai_addrlen;
2494                         eap->ex_masklen = 0;
2495                         break;
2496                 case GT_NET:
2497                         if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 &&
2498                             have_v6 == 0)
2499                                 goto skip;
2500                         eap->ex_addr =
2501                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net;
2502                         eap->ex_addrlen =
2503                             ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_net)->sa_len;
2504                         eap->ex_mask =
2505                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask;
2506                         eap->ex_masklen = ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask)->sa_len;
2507                         break;
2508                 case GT_DEFAULT:
2509                         eap->ex_addr = NULL;
2510                         eap->ex_addrlen = 0;
2511                         eap->ex_mask = NULL;
2512                         eap->ex_masklen = 0;
2513                         break;
2514                 case GT_IGNORE:
2515                         ret = 0;
2516                         goto error_exit;
2517                         break;
2518                 default:
2519                         syslog(LOG_ERR, "bad grouptype");
2520                         if (cp)
2521                                 *cp = savedc;
2522                         ret = 1;
2523                         goto error_exit;
2524                 }
2525
2526                 /*
2527                  * For V4:, use the nfssvc() syscall, instead of mount().
2528                  */
2529                 if (v4root_phase == 2) {
2530                         nfsea.fspec = v4root_dirpath;
2531                         if (nfssvc(NFSSVC_V4ROOTEXPORT, (caddr_t)&nfsea) < 0) {
2532                                 syslog(LOG_ERR, "Exporting V4: failed");
2533                                 return (2);
2534                         }
2535                 } else {
2536                         /*
2537                          * XXX:
2538                          * Maybe I should just use the fsb->f_mntonname path
2539                          * instead of looping back up the dirp to the mount
2540                          * point??
2541                          * Also, needs to know how to export all types of local
2542                          * exportable filesystems and not just "ufs".
2543                          */
2544                         iov[1].iov_base = fsb->f_fstypename; /* "fstype" */
2545                         iov[1].iov_len = strlen(fsb->f_fstypename) + 1;
2546                         iov[3].iov_base = fsb->f_mntonname; /* "fspath" */
2547                         iov[3].iov_len = strlen(fsb->f_mntonname) + 1;
2548                         iov[5].iov_base = fsb->f_mntfromname; /* "from" */
2549                         iov[5].iov_len = strlen(fsb->f_mntfromname) + 1;
2550                         errmsg[0] = '\0';
2551
2552                         while (nmount(iov, iovlen, fsb->f_flags) < 0) {
2553                                 if (cp)
2554                                         *cp-- = savedc;
2555                                 else
2556                                         cp = dirp + dirplen - 1;
2557                                 if (opt_flags & OP_QUIET) {
2558                                         ret = 1;
2559                                         goto error_exit;
2560                                 }
2561                                 if (errno == EPERM) {
2562                                         if (debug)
2563                                                 warnx("can't change attributes for %s: %s",
2564                                                     dirp, errmsg);
2565                                         syslog(LOG_ERR,
2566                                            "can't change attributes for %s: %s",
2567                                             dirp, errmsg);
2568                                         ret = 1;
2569                                         goto error_exit;
2570                                 }
2571                                 if (opt_flags & OP_ALLDIRS) {
2572                                         if (errno == EINVAL)
2573                                                 syslog(LOG_ERR,
2574                 "-alldirs requested but %s is not a filesystem mountpoint",
2575                                                     dirp);
2576                                         else
2577                                                 syslog(LOG_ERR,
2578                                                     "could not remount %s: %m",
2579                                                     dirp);
2580                                         ret = 1;
2581                                         goto error_exit;
2582                                 }
2583                                 /* back up over the last component */
2584                                 while (*cp == '/' && cp > dirp)
2585                                         cp--;
2586                                 while (*(cp - 1) != '/' && cp > dirp)
2587                                         cp--;
2588                                 if (cp == dirp) {
2589                                         if (debug)
2590                                                 warnx("mnt unsucc");
2591                                         syslog(LOG_ERR, "can't export %s %s",
2592                                             dirp, errmsg);
2593                                         ret = 1;
2594                                         goto error_exit;
2595                                 }
2596                                 savedc = *cp;
2597                                 *cp = '\0';
2598                                 /*
2599                                  * Check that we're still on the same
2600                                  * filesystem.
2601                                  */
2602                                 if (statfs(dirp, &fsb1) != 0 ||
2603                                     bcmp(&fsb1.f_fsid, &fsb->f_fsid,
2604                                     sizeof (fsb1.f_fsid)) != 0) {
2605                                         *cp = savedc;
2606                                         syslog(LOG_ERR,
2607                                             "can't export %s %s", dirp,
2608                                             errmsg);
2609                                         ret = 1;
2610                                         goto error_exit;
2611                                 }
2612                         }
2613                 }
2614
2615                 /*
2616                  * For the experimental server:
2617                  * If this is the public directory, get the file handle
2618                  * and load it into the kernel via the nfssvc() syscall.
2619                  */
2620                 if ((exflags & MNT_EXPUBLIC) != 0) {
2621                         fhandle_t fh;
2622                         char *public_name;
2623
2624                         if (eap->ex_indexfile != NULL)
2625                                 public_name = eap->ex_indexfile;
2626                         else
2627                                 public_name = dirp;
2628                         if (getfh(public_name, &fh) < 0)
2629                                 syslog(LOG_ERR,
2630                                     "Can't get public fh for %s", public_name);
2631                         else if (nfssvc(NFSSVC_PUBLICFH, (caddr_t)&fh) < 0)
2632                                 syslog(LOG_ERR,
2633                                     "Can't set public fh for %s", public_name);
2634                         else
2635                                 has_publicfh = 1;
2636                 }
2637 skip:
2638                 if (ai != NULL)
2639                         ai = ai->ai_next;
2640                 if (ai == NULL)
2641                         done = TRUE;
2642         }
2643         if (cp)
2644                 *cp = savedc;
2645 error_exit:
2646         /* free strings allocated by strdup() in getmntopts.c */
2647         if (iov != NULL) {
2648                 free(iov[0].iov_base); /* fstype */
2649                 free(iov[2].iov_base); /* fspath */
2650                 free(iov[4].iov_base); /* from */
2651                 free(iov[6].iov_base); /* update */
2652                 free(iov[8].iov_base); /* export */
2653                 free(iov[10].iov_base); /* errmsg */
2654
2655                 /* free iov, allocated by realloc() */
2656                 free(iov);
2657         }
2658         return (ret);
2659 }
2660
2661 /*
2662  * Translate a net address.
2663  *
2664  * If `maskflg' is nonzero, then `cp' is a netmask, not a network address.
2665  */
2666 static int
2667 get_net(char *cp, struct netmsk *net, int maskflg)
2668 {
2669         struct netent *np = NULL;
2670         char *name, *p, *prefp;
2671         struct sockaddr_in sin;
2672         struct sockaddr *sa = NULL;
2673         struct addrinfo hints, *ai = NULL;
2674         char netname[NI_MAXHOST];
2675         long preflen;
2676
2677         p = prefp = NULL;
2678         if ((opt_flags & OP_MASKLEN) && !maskflg) {
2679                 p = strchr(cp, '/');
2680                 *p = '\0';
2681                 prefp = p + 1;
2682         }
2683
2684         /*
2685          * Check for a numeric address first. We wish to avoid
2686          * possible DNS lookups in getnetbyname().
2687          */
2688         if (isxdigit(*cp) || *cp == ':') {
2689                 memset(&hints, 0, sizeof hints);
2690                 /* Ensure the mask and the network have the same family. */
2691                 if (maskflg && (opt_flags & OP_NET))
2692                         hints.ai_family = net->nt_net.ss_family;
2693                 else if (!maskflg && (opt_flags & OP_HAVEMASK))
2694                         hints.ai_family = net->nt_mask.ss_family;
2695                 else
2696                         hints.ai_family = AF_UNSPEC;
2697                 hints.ai_flags = AI_NUMERICHOST;
2698                 if (getaddrinfo(cp, NULL, &hints, &ai) == 0)
2699                         sa = ai->ai_addr;
2700                 if (sa != NULL && ai->ai_family == AF_INET) {
2701                         /*
2702                          * The address in `cp' is really a network address, so
2703                          * use inet_network() to re-interpret this correctly.
2704                          * e.g. "127.1" means 127.1.0.0, not 127.0.0.1.
2705                          */
2706                         bzero(&sin, sizeof sin);
2707                         sin.sin_family = AF_INET;
2708                         sin.sin_len = sizeof sin;
2709                         sin.sin_addr = inet_makeaddr(inet_network(cp), 0);
2710                         if (debug)
2711                                 fprintf(stderr, "get_net: v4 addr %s\n",
2712                                     inet_ntoa(sin.sin_addr));
2713                         sa = (struct sockaddr *)&sin;
2714                 }
2715         }
2716         if (sa == NULL && (np = getnetbyname(cp)) != NULL) {
2717                 bzero(&sin, sizeof sin);
2718                 sin.sin_family = AF_INET;
2719                 sin.sin_len = sizeof sin;
2720                 sin.sin_addr = inet_makeaddr(np->n_net, 0);
2721                 sa = (struct sockaddr *)&sin;
2722         }
2723         if (sa == NULL)
2724                 goto fail;
2725
2726         if (maskflg) {
2727                 /* The specified sockaddr is a mask. */
2728                 if (checkmask(sa) != 0)
2729                         goto fail;
2730                 bcopy(sa, &net->nt_mask, sa->sa_len);
2731                 opt_flags |= OP_HAVEMASK;
2732         } else {
2733                 /* The specified sockaddr is a network address. */
2734                 bcopy(sa, &net->nt_net, sa->sa_len);
2735
2736                 /* Get a network name for the export list. */
2737                 if (np) {
2738                         name = np->n_name;
2739                 } else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname,
2740                    NULL, 0, NI_NUMERICHOST) == 0) {
2741                         name = netname;
2742                 } else {
2743                         goto fail;
2744                 }
2745                 if ((net->nt_name = strdup(name)) == NULL)
2746                         out_of_mem();
2747
2748                 /*
2749                  * Extract a mask from either a "/<masklen>" suffix, or
2750                  * from the class of an IPv4 address.
2751                  */
2752                 if (opt_flags & OP_MASKLEN) {
2753                         preflen = strtol(prefp, NULL, 10);
2754                         if (preflen < 0L || preflen == LONG_MAX)
2755                                 goto fail;
2756                         bcopy(sa, &net->nt_mask, sa->sa_len);
2757                         if (makemask(&net->nt_mask, (int)preflen) != 0)
2758                                 goto fail;
2759                         opt_flags |= OP_HAVEMASK;
2760                         *p = '/';
2761                 } else if (sa->sa_family == AF_INET &&
2762                     (opt_flags & OP_MASK) == 0) {
2763                         in_addr_t addr;
2764
2765                         addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
2766                         if (IN_CLASSA(addr))
2767                                 preflen = 8;
2768                         else if (IN_CLASSB(addr))
2769                                 preflen = 16;
2770                         else if (IN_CLASSC(addr))
2771                                 preflen = 24;
2772                         else if (IN_CLASSD(addr))
2773                                 preflen = 28;
2774                         else
2775                                 preflen = 32;   /* XXX */
2776
2777                         bcopy(sa, &net->nt_mask, sa->sa_len);
2778                         makemask(&net->nt_mask, (int)preflen);
2779                         opt_flags |= OP_HAVEMASK;
2780                 }
2781         }
2782
2783         if (ai)
2784                 freeaddrinfo(ai);
2785         return 0;
2786
2787 fail:
2788         if (ai)
2789                 freeaddrinfo(ai);
2790         return 1;
2791 }
2792
2793 /*
2794  * Parse out the next white space separated field
2795  */
2796 static void
2797 nextfield(char **cp, char **endcp)
2798 {
2799         char *p;
2800
2801         p = *cp;
2802         while (*p == ' ' || *p == '\t')
2803                 p++;
2804         if (*p == '\n' || *p == '\0')
2805                 *cp = *endcp = p;
2806         else {
2807                 *cp = p++;
2808                 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
2809                         p++;
2810                 *endcp = p;
2811         }
2812 }
2813
2814 /*
2815  * Get an exports file line. Skip over blank lines and handle line
2816  * continuations.
2817  */
2818 static int
2819 get_line(void)
2820 {
2821         char *p, *cp;
2822         size_t len;
2823         int totlen, cont_line;
2824
2825         /*
2826          * Loop around ignoring blank lines and getting all continuation lines.
2827          */
2828         p = line;
2829         totlen = 0;
2830         do {
2831                 if ((p = fgetln(exp_file, &len)) == NULL)
2832                         return (0);
2833                 cp = p + len - 1;
2834                 cont_line = 0;
2835                 while (cp >= p &&
2836                     (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) {
2837                         if (*cp == '\\')
2838                                 cont_line = 1;
2839                         cp--;
2840                         len--;
2841                 }
2842                 if (cont_line) {
2843                         *++cp = ' ';
2844                         len++;
2845                 }
2846                 if (linesize < len + totlen + 1) {
2847                         linesize = len + totlen + 1;
2848                         line = realloc(line, linesize);
2849                         if (line == NULL)
2850                                 out_of_mem();
2851                 }
2852                 memcpy(line + totlen, p, len);
2853                 totlen += len;
2854                 line[totlen] = '\0';
2855         } while (totlen == 0 || cont_line);
2856         return (1);
2857 }
2858
2859 /*
2860  * Parse a description of a credential.
2861  */
2862 static void
2863 parsecred(char *namelist, struct xucred *cr)
2864 {
2865         char *name;
2866         int cnt;
2867         char *names;
2868         struct passwd *pw;
2869         struct group *gr;
2870         gid_t groups[XU_NGROUPS + 1];
2871         int ngroups;
2872
2873         cr->cr_version = XUCRED_VERSION;
2874         /*
2875          * Set up the unprivileged user.
2876          */
2877         cr->cr_uid = 65534;
2878         cr->cr_groups[0] = 65533;
2879         cr->cr_ngroups = 1;
2880         /*
2881          * Get the user's password table entry.
2882          */
2883         names = strsep_quote(&namelist, " \t\n");
2884         name = strsep(&names, ":");
2885         /* Bug?  name could be NULL here */
2886         if (isdigit(*name) || *name == '-')
2887                 pw = getpwuid(atoi(name));
2888         else
2889                 pw = getpwnam(name);
2890         /*
2891          * Credentials specified as those of a user.
2892          */
2893         if (names == NULL) {
2894                 if (pw == NULL) {
2895                         syslog(LOG_ERR, "unknown user: %s", name);
2896                         return;
2897                 }
2898                 cr->cr_uid = pw->pw_uid;
2899                 ngroups = XU_NGROUPS + 1;
2900                 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups))
2901                         syslog(LOG_ERR, "too many groups");
2902                 /*
2903                  * Compress out duplicate.
2904                  */
2905                 cr->cr_ngroups = ngroups - 1;
2906                 cr->cr_groups[0] = groups[0];
2907                 for (cnt = 2; cnt < ngroups; cnt++)
2908                         cr->cr_groups[cnt - 1] = groups[cnt];
2909                 return;
2910         }
2911         /*
2912          * Explicit credential specified as a colon separated list:
2913          *      uid:gid:gid:...
2914          */
2915         if (pw != NULL)
2916                 cr->cr_uid = pw->pw_uid;
2917         else if (isdigit(*name) || *name == '-')
2918                 cr->cr_uid = atoi(name);
2919         else {
2920                 syslog(LOG_ERR, "unknown user: %s", name);
2921                 return;
2922         }
2923         cr->cr_ngroups = 0;
2924         while (names != NULL && *names != '\0' && cr->cr_ngroups < XU_NGROUPS) {
2925                 name = strsep(&names, ":");
2926                 if (isdigit(*name) || *name == '-') {
2927                         cr->cr_groups[cr->cr_ngroups++] = atoi(name);
2928                 } else {
2929                         if ((gr = getgrnam(name)) == NULL) {
2930                                 syslog(LOG_ERR, "unknown group: %s", name);
2931                                 continue;
2932                         }
2933                         cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid;
2934                 }
2935         }
2936         if (names != NULL && *names != '\0' && cr->cr_ngroups == XU_NGROUPS)
2937                 syslog(LOG_ERR, "too many groups");
2938 }
2939
2940 #define STRSIZ  (MNTNAMLEN+MNTPATHLEN+50)
2941 /*
2942  * Routines that maintain the remote mounttab
2943  */
2944 static void
2945 get_mountlist(void)
2946 {
2947         struct mountlist *mlp;
2948         char *host, *dirp, *cp;
2949         char str[STRSIZ];
2950         FILE *mlfile;
2951
2952         if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) {
2953                 if (errno == ENOENT)
2954                         return;
2955                 else {
2956                         syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST);
2957                         return;
2958                 }
2959         }
2960         while (fgets(str, STRSIZ, mlfile) != NULL) {
2961                 cp = str;
2962                 host = strsep(&cp, " \t\n");
2963                 dirp = strsep(&cp, " \t\n");
2964                 if (host == NULL || dirp == NULL)
2965                         continue;
2966                 mlp = (struct mountlist *)malloc(sizeof (*mlp));
2967                 if (mlp == (struct mountlist *)NULL)
2968                         out_of_mem();
2969                 strncpy(mlp->ml_host, host, MNTNAMLEN);
2970                 mlp->ml_host[MNTNAMLEN] = '\0';
2971                 strncpy(mlp->ml_dirp, dirp, MNTPATHLEN);
2972                 mlp->ml_dirp[MNTPATHLEN] = '\0';
2973
2974                 SLIST_INSERT_HEAD(&mlhead, mlp, next);
2975         }
2976         fclose(mlfile);
2977 }
2978
2979 static void
2980 del_mlist(char *hostp, char *dirp)
2981 {
2982         struct mountlist *mlp, *mlp2;
2983         FILE *mlfile;
2984         int fnd = 0;
2985
2986         SLIST_FOREACH_SAFE(mlp, &mlhead, next, mlp2) {
2987                 if (!strcmp(mlp->ml_host, hostp) &&
2988                     (!dirp || !strcmp(mlp->ml_dirp, dirp))) {
2989                         fnd = 1;
2990                         SLIST_REMOVE(&mlhead, mlp, mountlist, next);
2991                         free((caddr_t)mlp);
2992                 }
2993         }
2994         if (fnd) {
2995                 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) {
2996                         syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST);
2997                         return;
2998                 }
2999                 SLIST_FOREACH(mlp, &mlhead, next) {
3000                         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
3001                 }
3002                 fclose(mlfile);
3003         }
3004 }
3005
3006 static void
3007 add_mlist(char *hostp, char *dirp)
3008 {
3009         struct mountlist *mlp;
3010         FILE *mlfile;
3011
3012         SLIST_FOREACH(mlp, &mlhead, next) {
3013                 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp))
3014                         return;
3015         }
3016
3017         mlp = (struct mountlist *)malloc(sizeof (*mlp));
3018         if (mlp == (struct mountlist *)NULL)
3019                 out_of_mem();
3020         strncpy(mlp->ml_host, hostp, MNTNAMLEN);
3021         mlp->ml_host[MNTNAMLEN] = '\0';
3022         strncpy(mlp->ml_dirp, dirp, MNTPATHLEN);
3023         mlp->ml_dirp[MNTPATHLEN] = '\0';
3024         SLIST_INSERT_HEAD(&mlhead, mlp, next);
3025         if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
3026                 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST);
3027                 return;
3028         }
3029         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
3030         fclose(mlfile);
3031 }
3032
3033 /*
3034  * Free up a group list.
3035  */
3036 static void
3037 free_grp(struct grouplist *grp)
3038 {
3039         if (grp->gr_type == GT_HOST) {
3040                 if (grp->gr_ptr.gt_addrinfo != NULL)
3041                         freeaddrinfo(grp->gr_ptr.gt_addrinfo);
3042         } else if (grp->gr_type == GT_NET) {
3043                 if (grp->gr_ptr.gt_net.nt_name)
3044                         free(grp->gr_ptr.gt_net.nt_name);
3045         }
3046         free((caddr_t)grp);
3047 }
3048
3049 #ifdef DEBUG
3050 static void
3051 SYSLOG(int pri, const char *fmt, ...)
3052 {
3053         va_list ap;
3054
3055         va_start(ap, fmt);
3056         vfprintf(stderr, fmt, ap);
3057         va_end(ap);
3058 }
3059 #endif /* DEBUG */
3060
3061 /*
3062  * Check options for consistency.
3063  */
3064 static int
3065 check_options(struct dirlist *dp)
3066 {
3067
3068         if (v4root_phase == 0 && dp == NULL)
3069             return (1);
3070         if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL)) {
3071             syslog(LOG_ERR, "-mapall and -maproot mutually exclusive");
3072             return (1);
3073         }
3074         if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) {
3075                 syslog(LOG_ERR, "-mask requires -network");
3076                 return (1);
3077         }
3078         if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) {
3079                 syslog(LOG_ERR, "-network requires mask specification");
3080                 return (1);
3081         }
3082         if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) {
3083                 syslog(LOG_ERR, "-mask and /masklen are mutually exclusive");
3084                 return (1);
3085         }
3086         if (v4root_phase > 0 &&
3087             (opt_flags &
3088              ~(OP_SEC | OP_MASK | OP_NET | OP_HAVEMASK | OP_MASKLEN)) != 0) {
3089             syslog(LOG_ERR,"only -sec,-net,-mask options allowed on V4:");
3090             return (1);
3091         }
3092         if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
3093             syslog(LOG_ERR, "-alldirs has multiple directories");
3094             return (1);
3095         }
3096         return (0);
3097 }
3098
3099 /*
3100  * Check an absolute directory path for any symbolic links. Return true
3101  */
3102 static int
3103 check_dirpath(char *dirp)
3104 {
3105         char *cp;
3106         int ret = 1;
3107         struct stat sb;
3108
3109         cp = dirp + 1;
3110         while (*cp && ret) {
3111                 if (*cp == '/') {
3112                         *cp = '\0';
3113                         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
3114                                 ret = 0;
3115                         *cp = '/';
3116                 }
3117                 cp++;
3118         }
3119         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
3120                 ret = 0;
3121         return (ret);
3122 }
3123
3124 /*
3125  * Make a netmask according to the specified prefix length. The ss_family
3126  * and other non-address fields must be initialised before calling this.
3127  */
3128 static int
3129 makemask(struct sockaddr_storage *ssp, int bitlen)
3130 {
3131         u_char *p;
3132         int bits, i, len;
3133
3134         if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL)
3135                 return (-1);
3136         if (bitlen > len * CHAR_BIT)
3137                 return (-1);
3138
3139         for (i = 0; i < len; i++) {
3140                 bits = MIN(CHAR_BIT, bitlen);
3141                 *p++ = (u_char)~0 << (CHAR_BIT - bits);
3142                 bitlen -= bits;
3143         }
3144         return 0;
3145 }
3146
3147 /*
3148  * Check that the sockaddr is a valid netmask. Returns 0 if the mask
3149  * is acceptable (i.e. of the form 1...10....0).
3150  */
3151 static int
3152 checkmask(struct sockaddr *sa)
3153 {
3154         u_char *mask;
3155         int i, len;
3156
3157         if ((mask = sa_rawaddr(sa, &len)) == NULL)
3158                 return (-1);
3159
3160         for (i = 0; i < len; i++)
3161                 if (mask[i] != 0xff)
3162                         break;
3163         if (i < len) {
3164                 if (~mask[i] & (u_char)(~mask[i] + 1))
3165                         return (-1);
3166                 i++;
3167         }
3168         for (; i < len; i++)
3169                 if (mask[i] != 0)
3170                         return (-1);
3171         return (0);
3172 }
3173
3174 /*
3175  * Compare two sockaddrs according to a specified mask. Return zero if
3176  * `sa1' matches `sa2' when filtered by the netmask in `samask'.
3177  * If samask is NULL, perform a full comparison.
3178  */
3179 static int
3180 sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask)
3181 {
3182         unsigned char *p1, *p2, *mask;
3183         int len, i;
3184
3185         if (sa1->sa_family != sa2->sa_family ||
3186             (p1 = sa_rawaddr(sa1, &len)) == NULL ||
3187             (p2 = sa_rawaddr(sa2, NULL)) == NULL)
3188                 return (1);
3189
3190         switch (sa1->sa_family) {
3191         case AF_INET6:
3192                 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
3193                     ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
3194                         return (1);
3195                 break;
3196         }
3197
3198         /* Simple binary comparison if no mask specified. */
3199         if (samask == NULL)
3200                 return (memcmp(p1, p2, len));
3201
3202         /* Set up the mask, and do a mask-based comparison. */
3203         if (sa1->sa_family != samask->sa_family ||
3204             (mask = sa_rawaddr(samask, NULL)) == NULL)
3205                 return (1);
3206
3207         for (i = 0; i < len; i++)
3208                 if ((p1[i] & mask[i]) != (p2[i] & mask[i]))
3209                         return (1);
3210         return (0);
3211 }
3212
3213 /*
3214  * Return a pointer to the part of the sockaddr that contains the
3215  * raw address, and set *nbytes to its length in bytes. Returns
3216  * NULL if the address family is unknown.
3217  */
3218 static void *
3219 sa_rawaddr(struct sockaddr *sa, int *nbytes) {
3220         void *p;
3221         int len;
3222
3223         switch (sa->sa_family) {
3224         case AF_INET:
3225                 len = sizeof(((struct sockaddr_in *)sa)->sin_addr);
3226                 p = &((struct sockaddr_in *)sa)->sin_addr;
3227                 break;
3228         case AF_INET6:
3229                 len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr);
3230                 p = &((struct sockaddr_in6 *)sa)->sin6_addr;
3231                 break;
3232         default:
3233                 p = NULL;
3234                 len = 0;
3235         }
3236
3237         if (nbytes != NULL)
3238                 *nbytes = len;
3239         return (p);
3240 }
3241
3242 static void
3243 huphandler(int sig __unused)
3244 {
3245
3246         got_sighup = 1;
3247 }
3248
3249 static void
3250 terminate(int sig __unused)
3251 {
3252         pidfile_remove(pfh);
3253         rpcb_unset(MOUNTPROG, MOUNTVERS, NULL);
3254         rpcb_unset(MOUNTPROG, MOUNTVERS3, NULL);
3255         exit (0);
3256 }