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  * 4. 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 *, const char *);
 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)-2,
 237         1,
 238         { (gid_t)-2 },
 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                     statfs(dirpath, &fsb) < 0) {
1055                         chdir("/");     /* Just in case realpath doesn't */
1056                         syslog(LOG_NOTICE,
1057                             "mount request from %s for non existent path %s",
1058                             numerichost, dirpath);
1059                         if (debug)
1060                                 warnx("stat failed on %s", dirpath);
1061                         bad = ENOENT;   /* We will send error reply later */
1062                 }
1063                 if (!bad &&
1064                     !S_ISDIR(stb.st_mode) &&
1065                     (dir_only || !S_ISREG(stb.st_mode))) {
1066                         syslog(LOG_NOTICE,
1067                             "mount request from %s for non-directory path %s",
1068                             numerichost, dirpath);
1069                         if (debug)
1070                                 warnx("mounting non-directory %s", dirpath);
1071                         bad = ENOTDIR;  /* We will send error reply later */
1072                 }
1073
1074                 /* Check in the exports list */
1075                 sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
1076                 if (bad)
1077                         ep = NULL;
1078                 else
1079                         ep = ex_search(&fsb.f_fsid);
1080                 hostset = defset = 0;
1081                 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset,
1082                     &numsecflavors, &secflavorsp) ||
1083                     ((dp = dirp_search(ep->ex_dirl, dirpath)) &&
1084                       chk_host(dp, saddr, &defset, &hostset, &numsecflavors,
1085                        &secflavorsp)) ||
1086                     (defset && scan_tree(ep->ex_defdir, saddr) == 0 &&
1087                      scan_tree(ep->ex_dirl, saddr) == 0))) {
1088                         if (bad) {
1089                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
1090                                     (caddr_t)&bad))
1091                                         syslog(LOG_ERR, "can't send reply");
1092                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1093                                 return;
1094                         }
1095                         if (hostset & DP_HOSTSET) {
1096                                 fhr.fhr_flag = hostset;
1097                                 fhr.fhr_numsecflavors = numsecflavors;
1098                                 fhr.fhr_secflavors = secflavorsp;
1099                         } else {
1100                                 fhr.fhr_flag = defset;
1101                                 fhr.fhr_numsecflavors = ep->ex_defnumsecflavors;
1102                                 fhr.fhr_secflavors = ep->ex_defsecflavors;
1103                         }
1104                         fhr.fhr_vers = rqstp->rq_vers;
1105                         /* Get the file handle */
1106                         memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t));
1107                         if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) {
1108                                 bad = errno;
1109                                 syslog(LOG_ERR, "can't get fh for %s", dirpath);
1110                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
1111                                     (caddr_t)&bad))
1112                                         syslog(LOG_ERR, "can't send reply");
1113                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1114                                 return;
1115                         }
1116                         if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs,
1117                             (caddr_t)&fhr))
1118                                 syslog(LOG_ERR, "can't send reply");
1119                         if (!lookup_failed)
1120                                 add_mlist(host, dirpath);
1121                         else
1122                                 add_mlist(numerichost, dirpath);
1123                         if (debug)
1124                                 warnx("mount successful");
1125                         if (dolog)
1126                                 syslog(LOG_NOTICE,
1127                                     "mount request succeeded from %s for %s",
1128                                     numerichost, dirpath);
1129                 } else {
1130                         if (!bad)
1131                                 bad = EACCES;
1132                         syslog(LOG_NOTICE,
1133                             "mount request denied from %s for %s",
1134                             numerichost, dirpath);
1135                 }
1136
1137                 if (bad && !svc_sendreply(transp, (xdrproc_t)xdr_long,
1138                     (caddr_t)&bad))
1139                         syslog(LOG_ERR, "can't send reply");
1140                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1141                 return;
1142         case MOUNTPROC_DUMP:
1143                 if (!svc_sendreply(transp, (xdrproc_t)xdr_mlist, (caddr_t)NULL))
1144                         syslog(LOG_ERR, "can't send reply");
1145                 else if (dolog)
1146                         syslog(LOG_NOTICE,
1147                             "dump request succeeded from %s",
1148                             numerichost);
1149                 return;
1150         case MOUNTPROC_UMNT:
1151                 if (sport >= IPPORT_RESERVED && resvport_only) {
1152                         syslog(LOG_NOTICE,
1153                             "umount request from %s from unprivileged port",
1154                             numerichost);
1155                         svcerr_weakauth(transp);
1156                         return;
1157                 }
1158                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
1159                         syslog(LOG_NOTICE, "undecodable umount request from %s",
1160                             numerichost);
1161                         svcerr_decode(transp);
1162                         return;
1163                 }
1164                 if (realpath(rpcpath, dirpath) == NULL) {
1165                         syslog(LOG_NOTICE, "umount request from %s "
1166                             "for non existent path %s",
1167                             numerichost, dirpath);
1168                 }
1169                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL))
1170                         syslog(LOG_ERR, "can't send reply");
1171                 if (!lookup_failed)
1172                         del_mlist(host, dirpath);
1173                 del_mlist(numerichost, dirpath);
1174                 if (dolog)
1175                         syslog(LOG_NOTICE,
1176                             "umount request succeeded from %s for %s",
1177                             numerichost, dirpath);
1178                 return;
1179         case MOUNTPROC_UMNTALL:
1180                 if (sport >= IPPORT_RESERVED && resvport_only) {
1181                         syslog(LOG_NOTICE,
1182                             "umountall request from %s from unprivileged port",
1183                             numerichost);
1184                         svcerr_weakauth(transp);
1185                         return;
1186                 }
1187                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL))
1188                         syslog(LOG_ERR, "can't send reply");
1189                 if (!lookup_failed)
1190                         del_mlist(host, NULL);
1191                 del_mlist(numerichost, NULL);
1192                 if (dolog)
1193                         syslog(LOG_NOTICE,
1194                             "umountall request succeeded from %s",
1195                             numerichost);
1196                 return;
1197         case MOUNTPROC_EXPORT:
1198                 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, (caddr_t)NULL))
1199                         if (!svc_sendreply(transp, (xdrproc_t)xdr_explist_brief,
1200                             (caddr_t)NULL))
1201                                 syslog(LOG_ERR, "can't send reply");
1202                 if (dolog)
1203                         syslog(LOG_NOTICE,
1204                             "export request succeeded from %s",
1205                             numerichost);
1206                 return;
1207         default:
1208                 svcerr_noproc(transp);
1209                 return;
1210         }
1211 }
1212
1213 /*
1214  * Xdr conversion for a dirpath string
1215  */
1216 static int
1217 xdr_dir(XDR *xdrsp, char *dirp)
1218 {
1219         return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
1220 }
1221
1222 /*
1223  * Xdr routine to generate file handle reply
1224  */
1225 static int
1226 xdr_fhs(XDR *xdrsp, caddr_t cp)
1227 {
1228         struct fhreturn *fhrp = (struct fhreturn *)cp;
1229         u_long ok = 0, len, auth;
1230         int i;
1231
1232         if (!xdr_long(xdrsp, &ok))
1233                 return (0);
1234         switch (fhrp->fhr_vers) {
1235         case 1:
1236                 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH));
1237         case 3:
1238                 len = NFSX_V3FH;
1239                 if (!xdr_long(xdrsp, &len))
1240                         return (0);
1241                 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len))
1242                         return (0);
1243                 if (fhrp->fhr_numsecflavors) {
1244                         if (!xdr_int(xdrsp, &fhrp->fhr_numsecflavors))
1245                                 return (0);
1246                         for (i = 0; i < fhrp->fhr_numsecflavors; i++)
1247                                 if (!xdr_int(xdrsp, &fhrp->fhr_secflavors[i]))
1248                                         return (0);
1249                         return (1);
1250                 } else {
1251                         auth = AUTH_SYS;
1252                         len = 1;
1253                         if (!xdr_long(xdrsp, &len))
1254                                 return (0);
1255                         return (xdr_long(xdrsp, &auth));
1256                 }
1257         }
1258         return (0);
1259 }
1260
1261 static int
1262 xdr_mlist(XDR *xdrsp, caddr_t cp __unused)
1263 {
1264         struct mountlist *mlp;
1265         int true = 1;
1266         int false = 0;
1267         char *strp;
1268
1269         SLIST_FOREACH(mlp, &mlhead, next) {
1270                 if (!xdr_bool(xdrsp, &true))
1271                         return (0);
1272                 strp = &mlp->ml_host[0];
1273                 if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
1274                         return (0);
1275                 strp = &mlp->ml_dirp[0];
1276                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1277                         return (0);
1278         }
1279         if (!xdr_bool(xdrsp, &false))
1280                 return (0);
1281         return (1);
1282 }
1283
1284 /*
1285  * Xdr conversion for export list
1286  */
1287 static int
1288 xdr_explist_common(XDR *xdrsp, caddr_t cp __unused, int brief)
1289 {
1290         struct exportlist *ep;
1291         int false = 0;
1292         int putdef;
1293         sigset_t sighup_mask;
1294
1295         sigemptyset(&sighup_mask);
1296         sigaddset(&sighup_mask, SIGHUP);
1297         sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
1298
1299         SLIST_FOREACH(ep, &exphead, entries) {
1300                 putdef = 0;
1301                 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir,
1302                                &putdef, brief))
1303                         goto errout;
1304                 if (ep->ex_defdir && putdef == 0 &&
1305                         put_exlist(ep->ex_defdir, xdrsp, (struct dirlist *)NULL,
1306                         &putdef, brief))
1307                         goto errout;
1308         }
1309         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1310         if (!xdr_bool(xdrsp, &false))
1311                 return (0);
1312         return (1);
1313 errout:
1314         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1315         return (0);
1316 }
1317
1318 /*
1319  * Called from xdr_explist() to traverse the tree and export the
1320  * directory paths.
1321  */
1322 static int
1323 put_exlist(struct dirlist *dp, XDR *xdrsp, struct dirlist *adp, int *putdefp,
1324         int brief)
1325 {
1326         struct grouplist *grp;
1327         struct hostlist *hp;
1328         int true = 1;
1329         int false = 0;
1330         int gotalldir = 0;
1331         char *strp;
1332
1333         if (dp) {
1334                 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp, brief))
1335                         return (1);
1336                 if (!xdr_bool(xdrsp, &true))
1337                         return (1);
1338                 strp = dp->dp_dirp;
1339                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1340                         return (1);
1341                 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) {
1342                         gotalldir = 1;
1343                         *putdefp = 1;
1344                 }
1345                 if (brief) {
1346                         if (!xdr_bool(xdrsp, &true))
1347                                 return (1);
1348                         strp = "(...)";
1349                         if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1350                                 return (1);
1351                 } else if ((dp->dp_flag & DP_DEFSET) == 0 &&
1352                     (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) {
1353                         hp = dp->dp_hosts;
1354                         while (hp) {
1355                                 grp = hp->ht_grp;
1356                                 if (grp->gr_type == GT_HOST) {
1357                                         if (!xdr_bool(xdrsp, &true))
1358                                                 return (1);
1359                                         strp = grp->gr_ptr.gt_addrinfo->ai_canonname;
1360                                         if (!xdr_string(xdrsp, &strp,
1361                                             MNTNAMLEN))
1362                                                 return (1);
1363                                 } else if (grp->gr_type == GT_NET) {
1364                                         if (!xdr_bool(xdrsp, &true))
1365                                                 return (1);
1366                                         strp = grp->gr_ptr.gt_net.nt_name;
1367                                         if (!xdr_string(xdrsp, &strp,
1368                                             MNTNAMLEN))
1369                                                 return (1);
1370                                 }
1371                                 hp = hp->ht_next;
1372                                 if (gotalldir && hp == (struct hostlist *)NULL) {
1373                                         hp = adp->dp_hosts;
1374                                         gotalldir = 0;
1375                                 }
1376                         }
1377                 }
1378                 if (!xdr_bool(xdrsp, &false))
1379                         return (1);
1380                 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp, brief))
1381                         return (1);
1382         }
1383         return (0);
1384 }
1385
1386 static int
1387 xdr_explist(XDR *xdrsp, caddr_t cp)
1388 {
1389
1390         return xdr_explist_common(xdrsp, cp, 0);
1391 }
1392
1393 static int
1394 xdr_explist_brief(XDR *xdrsp, caddr_t cp)
1395 {
1396
1397         return xdr_explist_common(xdrsp, cp, 1);
1398 }
1399
1400 static char *line;
1401 static size_t linesize;
1402 static FILE *exp_file;
1403
1404 /*
1405  * Get the export list from one, currently open file
1406  */
1407 static void
1408 get_exportlist_one(void)
1409 {
1410         struct exportlist *ep;
1411         struct grouplist *grp, *tgrp;
1412         struct dirlist *dirhead;
1413         struct statfs fsb;
1414         struct xucred anon;
1415         char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc;
1416         int len, has_host, exflags, got_nondir, dirplen, netgrp;
1417
1418         v4root_phase = 0;
1419         dirhead = (struct dirlist *)NULL;
1420         while (get_line()) {
1421                 if (debug)
1422                         warnx("got line %s", line);
1423                 cp = line;
1424                 nextfield(&cp, &endcp);
1425                 if (*cp == '#')
1426                         goto nextline;
1427
1428                 /*
1429                  * Set defaults.
1430                  */
1431                 has_host = FALSE;
1432                 anon = def_anon;
1433                 exflags = MNT_EXPORTED;
1434                 got_nondir = 0;
1435                 opt_flags = 0;
1436                 ep = (struct exportlist *)NULL;
1437                 dirp = NULL;
1438
1439                 /*
1440                  * Handle the V4 root dir.
1441                  */
1442                 if (*cp == 'V' && *(cp + 1) == '4' && *(cp + 2) == ':') {
1443                         /*
1444                          * V4: just indicates that it is the v4 root point,
1445                          * so skip over that and set v4root_phase.
1446                          */
1447                         if (v4root_phase > 0) {
1448                                 syslog(LOG_ERR, "V4:duplicate line, ignored");
1449                                 goto nextline;
1450                         }
1451                         v4root_phase = 1;
1452                         cp += 3;
1453                         nextfield(&cp, &endcp);
1454                 }
1455
1456                 /*
1457                  * Create new exports list entry
1458                  */
1459                 len = endcp-cp;
1460                 tgrp = grp = get_grp();
1461                 while (len > 0) {
1462                         if (len > MNTNAMLEN) {
1463                             getexp_err(ep, tgrp, "mountpoint too long");
1464                             goto nextline;
1465                         }
1466                         if (*cp == '-') {
1467                             if (ep == (struct exportlist *)NULL) {
1468                                 getexp_err(ep, tgrp,
1469                                     "flag before export path definition");
1470                                 goto nextline;
1471                             }
1472                             if (debug)
1473                                 warnx("doing opt %s", cp);
1474                             got_nondir = 1;
1475                             if (do_opt(&cp, &endcp, ep, grp, &has_host,
1476                                 &exflags, &anon)) {
1477                                 getexp_err(ep, tgrp, NULL);
1478                                 goto nextline;
1479                             }
1480                         } else if (*cp == '/') {
1481                             savedc = *endcp;
1482                             *endcp = '\0';
1483                             if (v4root_phase > 1) {
1484                                     if (dirp != NULL) {
1485                                         getexp_err(ep, tgrp, "Multiple V4 dirs");
1486                                         goto nextline;
1487                                     }
1488                             }
1489                             if (check_dirpath(cp) &&
1490                                 statfs(cp, &fsb) >= 0) {
1491                                 if ((fsb.f_flags & MNT_AUTOMOUNTED) != 0)
1492                                     syslog(LOG_ERR, "Warning: exporting of "
1493                                         "automounted fs %s not supported", cp);
1494                                 if (got_nondir) {
1495                                     getexp_err(ep, tgrp, "dirs must be first");
1496                                     goto nextline;
1497                                 }
1498                                 if (v4root_phase == 1) {
1499                                     if (dirp != NULL) {
1500                                         getexp_err(ep, tgrp, "Multiple V4 dirs");
1501                                         goto nextline;
1502                                     }
1503                                     if (strlen(v4root_dirpath) == 0) {
1504                                         strlcpy(v4root_dirpath, cp,
1505                                             sizeof (v4root_dirpath));
1506                                     } else if (strcmp(v4root_dirpath, cp)
1507                                         != 0) {
1508                                         syslog(LOG_ERR,
1509                                             "different V4 dirpath %s", cp);
1510                                         getexp_err(ep, tgrp, NULL);
1511                                         goto nextline;
1512                                     }
1513                                     dirp = cp;
1514                                     v4root_phase = 2;
1515                                     got_nondir = 1;
1516                                     ep = get_exp();
1517                                 } else {
1518                                     if (ep) {
1519                                         if (ep->ex_fs.val[0] !=
1520                                             fsb.f_fsid.val[0] ||
1521                                             ep->ex_fs.val[1] !=
1522                                             fsb.f_fsid.val[1]) {
1523                                                 getexp_err(ep, tgrp,
1524                                                     "fsid mismatch");
1525                                                 goto nextline;
1526                                         }
1527                                     } else {
1528                                         /*
1529                                          * See if this directory is already
1530                                          * in the list.
1531                                          */
1532                                         ep = ex_search(&fsb.f_fsid);
1533                                         if (ep == (struct exportlist *)NULL) {
1534                                             ep = get_exp();
1535                                             ep->ex_fs = fsb.f_fsid;
1536                                             ep->ex_fsdir = strdup(fsb.f_mntonname);
1537                                             if (ep->ex_fsdir == NULL)
1538                                                 out_of_mem();
1539                                             if (debug)
1540                                                 warnx(
1541                                                   "making new ep fs=0x%x,0x%x",
1542                                                   fsb.f_fsid.val[0],
1543                                                   fsb.f_fsid.val[1]);
1544                                         } else if (debug)
1545                                             warnx("found ep fs=0x%x,0x%x",
1546                                                 fsb.f_fsid.val[0],
1547                                                 fsb.f_fsid.val[1]);
1548                                     }
1549
1550                                     /*
1551                                      * Add dirpath to export mount point.
1552                                      */
1553                                     dirp = add_expdir(&dirhead, cp, len);
1554                                     dirplen = len;
1555                                 }
1556                             } else {
1557                                 getexp_err(ep, tgrp,
1558                                     "symbolic link in export path or statfs failed");
1559                                 goto nextline;
1560                             }
1561                             *endcp = savedc;
1562                         } else {
1563                             savedc = *endcp;
1564                             *endcp = '\0';
1565                             got_nondir = 1;
1566                             if (ep == (struct exportlist *)NULL) {
1567                                 getexp_err(ep, tgrp,
1568                                     "host(s) before export path definition");
1569                                 goto nextline;
1570                             }
1571
1572                             /*
1573                              * Get the host or netgroup.
1574                              */
1575                             setnetgrent(cp);
1576                             netgrp = getnetgrent(&hst, &usr, &dom);
1577                             do {
1578                                 if (has_host) {
1579                                     grp->gr_next = get_grp();
1580                                     grp = grp->gr_next;
1581                                 }
1582                                 if (netgrp) {
1583                                     if (hst == 0) {
1584                                         syslog(LOG_ERR,
1585                                 "null hostname in netgroup %s, skipping", cp);
1586                                         grp->gr_type = GT_IGNORE;
1587                                     } else if (get_host(hst, grp, tgrp)) {
1588                                         syslog(LOG_ERR,
1589                         "bad host %s in netgroup %s, skipping", hst, cp);
1590                                         grp->gr_type = GT_IGNORE;
1591                                     }
1592                                 } else if (get_host(cp, grp, tgrp)) {
1593                                     syslog(LOG_ERR, "bad host %s, skipping", cp);
1594                                     grp->gr_type = GT_IGNORE;
1595                                 }
1596                                 has_host = TRUE;
1597                             } while (netgrp && getnetgrent(&hst, &usr, &dom));
1598                             endnetgrent();
1599                             *endcp = savedc;
1600                         }
1601                         cp = endcp;
1602                         nextfield(&cp, &endcp);
1603                         len = endcp - cp;
1604                 }
1605                 if (check_options(dirhead)) {
1606                         getexp_err(ep, tgrp, NULL);
1607                         goto nextline;
1608                 }
1609                 if (!has_host) {
1610                         grp->gr_type = GT_DEFAULT;
1611                         if (debug)
1612                                 warnx("adding a default entry");
1613
1614                 /*
1615                  * Don't allow a network export coincide with a list of
1616                  * host(s) on the same line.
1617                  */
1618                 } else if ((opt_flags & OP_NET) && tgrp->gr_next) {
1619                         getexp_err(ep, tgrp, "network/host conflict");
1620                         goto nextline;
1621
1622                 /*
1623                  * If an export list was specified on this line, make sure
1624                  * that we have at least one valid entry, otherwise skip it.
1625                  */
1626                 } else {
1627                         grp = tgrp;
1628                         while (grp && grp->gr_type == GT_IGNORE)
1629                                 grp = grp->gr_next;
1630                         if (! grp) {
1631                             getexp_err(ep, tgrp, "no valid entries");
1632                             goto nextline;
1633                         }
1634                 }
1635
1636                 if (v4root_phase == 1) {
1637                         getexp_err(ep, tgrp, "V4:root, no dirp, ignored");
1638                         goto nextline;
1639                 }
1640
1641                 /*
1642                  * Loop through hosts, pushing the exports into the kernel.
1643                  * After loop, tgrp points to the start of the list and
1644                  * grp points to the last entry in the list.
1645                  */
1646                 grp = tgrp;
1647                 do {
1648                         if (do_mount(ep, grp, exflags, &anon, dirp, dirplen,
1649                             &fsb)) {
1650                                 getexp_err(ep, tgrp, NULL);
1651                                 goto nextline;
1652                         }
1653                 } while (grp->gr_next && (grp = grp->gr_next));
1654
1655                 /*
1656                  * For V4: don't enter in mount lists.
1657                  */
1658                 if (v4root_phase > 0 && v4root_phase <= 2) {
1659                         /*
1660                          * Since these structures aren't used by mountd,
1661                          * free them up now.
1662                          */
1663                         if (ep != NULL)
1664                                 free_exp(ep);
1665                         while (tgrp != NULL) {
1666                                 grp = tgrp;
1667                                 tgrp = tgrp->gr_next;
1668                                 free_grp(grp);
1669                         }
1670                         goto nextline;
1671                 }
1672
1673                 /*
1674                  * Success. Update the data structures.
1675                  */
1676                 if (has_host) {
1677                         hang_dirp(dirhead, tgrp, ep, opt_flags);
1678                         grp->gr_next = grphead;
1679                         grphead = tgrp;
1680                 } else {
1681                         hang_dirp(dirhead, (struct grouplist *)NULL, ep,
1682                                 opt_flags);
1683                         free_grp(grp);
1684                 }
1685                 dirhead = (struct dirlist *)NULL;
1686                 if ((ep->ex_flag & EX_LINKED) == 0) {
1687                         SLIST_INSERT_HEAD(&exphead, ep, entries);
1688
1689                         ep->ex_flag |= EX_LINKED;
1690                 }
1691 nextline:
1692                 v4root_phase = 0;
1693                 if (dirhead) {
1694                         free_dir(dirhead);
1695                         dirhead = (struct dirlist *)NULL;
1696                 }
1697         }
1698 }
1699
1700 /*
1701  * Get the export list from all specified files
1702  */
1703 static void
1704 get_exportlist(void)
1705 {
1706         struct exportlist *ep, *ep2;
1707         struct grouplist *grp, *tgrp;
1708         struct export_args export;
1709         struct iovec *iov;
1710         struct statfs *fsp, *mntbufp;
1711         struct xvfsconf vfc;
1712         char errmsg[255];
1713         int num, i;
1714         int iovlen;
1715         int done;
1716         struct nfsex_args eargs;
1717
1718         if (suspend_nfsd != 0)
1719                 (void)nfssvc(NFSSVC_SUSPENDNFSD, NULL);
1720         v4root_dirpath[0] = '\0';
1721         bzero(&export, sizeof(export));
1722         export.ex_flags = MNT_DELEXPORT;
1723         iov = NULL;
1724         iovlen = 0;
1725         bzero(errmsg, sizeof(errmsg));
1726
1727         /*
1728          * First, get rid of the old list
1729          */
1730         SLIST_FOREACH_SAFE(ep, &exphead, entries, ep2) {
1731                 SLIST_REMOVE(&exphead, ep, exportlist, entries);
1732                 free_exp(ep);
1733         }
1734
1735         grp = grphead;
1736         while (grp) {
1737                 tgrp = grp;
1738                 grp = grp->gr_next;
1739                 free_grp(tgrp);
1740         }
1741         grphead = (struct grouplist *)NULL;
1742
1743         /*
1744          * and the old V4 root dir.
1745          */
1746         bzero(&eargs, sizeof (eargs));
1747         eargs.export.ex_flags = MNT_DELEXPORT;
1748         if (nfssvc(NFSSVC_V4ROOTEXPORT, (caddr_t)&eargs) < 0 &&
1749             errno != ENOENT)
1750                 syslog(LOG_ERR, "Can't delete exports for V4:");
1751
1752         /*
1753          * and clear flag that notes if a public fh has been exported.
1754          */
1755         has_publicfh = 0;
1756
1757         /*
1758          * And delete exports that are in the kernel for all local
1759          * filesystems.
1760          * XXX: Should know how to handle all local exportable filesystems.
1761          */
1762         num = getmntinfo(&mntbufp, MNT_NOWAIT);
1763
1764         if (num > 0) {
1765                 build_iovec(&iov, &iovlen, "fstype", NULL, 0);
1766                 build_iovec(&iov, &iovlen, "fspath", NULL, 0);
1767                 build_iovec(&iov, &iovlen, "from", NULL, 0);
1768                 build_iovec(&iov, &iovlen, "update", NULL, 0);
1769                 build_iovec(&iov, &iovlen, "export", &export, sizeof(export));
1770                 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
1771         }
1772
1773         for (i = 0; i < num; i++) {
1774                 fsp = &mntbufp[i];
1775                 if (getvfsbyname(fsp->f_fstypename, &vfc) != 0) {
1776                         syslog(LOG_ERR, "getvfsbyname() failed for %s",
1777                             fsp->f_fstypename);
1778                         continue;
1779                 }
1780
1781                 /*
1782                  * We do not need to delete "export" flag from
1783                  * filesystems that do not have it set.
1784                  */
1785                 if (!(fsp->f_flags & MNT_EXPORTED))
1786                     continue;
1787                 /*
1788                  * Do not delete export for network filesystem by
1789                  * passing "export" arg to nmount().
1790                  * It only makes sense to do this for local filesystems.
1791                  */
1792                 if (vfc.vfc_flags & VFCF_NETWORK)
1793                         continue;
1794
1795                 iov[1].iov_base = fsp->f_fstypename;
1796                 iov[1].iov_len = strlen(fsp->f_fstypename) + 1;
1797                 iov[3].iov_base = fsp->f_mntonname;
1798                 iov[3].iov_len = strlen(fsp->f_mntonname) + 1;
1799                 iov[5].iov_base = fsp->f_mntfromname;
1800                 iov[5].iov_len = strlen(fsp->f_mntfromname) + 1;
1801                 errmsg[0] = '\0';
1802
1803                 /*
1804                  * EXDEV is returned when path exists but is not a
1805                  * mount point.  May happens if raced with unmount.
1806                  */
1807                 if (nmount(iov, iovlen, fsp->f_flags) < 0 &&
1808                     errno != ENOENT && errno != ENOTSUP && errno != EXDEV) {
1809                         syslog(LOG_ERR,
1810                             "can't delete exports for %s: %m %s",
1811                             fsp->f_mntonname, errmsg);
1812                 }
1813         }
1814
1815         if (iov != NULL) {
1816                 /* Free strings allocated by strdup() in getmntopts.c */
1817                 free(iov[0].iov_base); /* fstype */
1818                 free(iov[2].iov_base); /* fspath */
1819                 free(iov[4].iov_base); /* from */
1820                 free(iov[6].iov_base); /* update */
1821                 free(iov[8].iov_base); /* export */
1822                 free(iov[10].iov_base); /* errmsg */
1823
1824                 /* free iov, allocated by realloc() */
1825                 free(iov);
1826                 iovlen = 0;
1827         }
1828
1829         /*
1830          * Read in the exports file and build the list, calling
1831          * nmount() as we go along to push the export rules into the kernel.
1832          */
1833         done = 0;
1834         for (i = 0; exnames[i] != NULL; i++) {
1835                 if (debug)
1836                         warnx("reading exports from %s", exnames[i]);
1837                 if ((exp_file = fopen(exnames[i], "r")) == NULL) {
1838                         syslog(LOG_WARNING, "can't open %s", exnames[i]);
1839                         continue;
1840                 }
1841                 get_exportlist_one();
1842                 fclose(exp_file);
1843                 done++;
1844         }
1845         if (done == 0) {
1846                 syslog(LOG_ERR, "can't open any exports file");
1847                 exit(2);
1848         }
1849
1850         /*
1851          * If there was no public fh, clear any previous one set.
1852          */
1853         if (has_publicfh == 0)
1854                 (void) nfssvc(NFSSVC_NOPUBLICFH, NULL);
1855
1856         /* Resume the nfsd. If they weren't suspended, this is harmless. */
1857         (void)nfssvc(NFSSVC_RESUMENFSD, NULL);
1858 }
1859
1860 /*
1861  * Allocate an export list element
1862  */
1863 static struct exportlist *
1864 get_exp(void)
1865 {
1866         struct exportlist *ep;
1867
1868         ep = (struct exportlist *)calloc(1, sizeof (struct exportlist));
1869         if (ep == (struct exportlist *)NULL)
1870                 out_of_mem();
1871         return (ep);
1872 }
1873
1874 /*
1875  * Allocate a group list element
1876  */
1877 static struct grouplist *
1878 get_grp(void)
1879 {
1880         struct grouplist *gp;
1881
1882         gp = (struct grouplist *)calloc(1, sizeof (struct grouplist));
1883         if (gp == (struct grouplist *)NULL)
1884                 out_of_mem();
1885         return (gp);
1886 }
1887
1888 /*
1889  * Clean up upon an error in get_exportlist().
1890  */
1891 static void
1892 getexp_err(struct exportlist *ep, struct grouplist *grp, const char *reason)
1893 {
1894         struct grouplist *tgrp;
1895
1896         if (!(opt_flags & OP_QUIET)) {
1897                 if (reason != NULL)
1898                         syslog(LOG_ERR, "bad exports list line '%s': %s", line,
1899                             reason);
1900                 else
1901                         syslog(LOG_ERR, "bad exports list line '%s'", line);
1902         }
1903         if (ep && (ep->ex_flag & EX_LINKED) == 0)
1904                 free_exp(ep);
1905         while (grp) {
1906                 tgrp = grp;
1907                 grp = grp->gr_next;
1908                 free_grp(tgrp);
1909         }
1910 }
1911
1912 /*
1913  * Search the export list for a matching fs.
1914  */
1915 static struct exportlist *
1916 ex_search(fsid_t *fsid)
1917 {
1918         struct exportlist *ep;
1919
1920         SLIST_FOREACH(ep, &exphead, entries) {
1921                 if (ep->ex_fs.val[0] == fsid->val[0] &&
1922                     ep->ex_fs.val[1] == fsid->val[1])
1923                         return (ep);
1924         }
1925
1926         return (ep);
1927 }
1928
1929 /*
1930  * Add a directory path to the list.
1931  */
1932 static char *
1933 add_expdir(struct dirlist **dpp, char *cp, int len)
1934 {
1935         struct dirlist *dp;
1936
1937         dp = malloc(sizeof (struct dirlist));
1938         if (dp == (struct dirlist *)NULL)
1939                 out_of_mem();
1940         dp->dp_left = *dpp;
1941         dp->dp_right = (struct dirlist *)NULL;
1942         dp->dp_flag = 0;
1943         dp->dp_hosts = (struct hostlist *)NULL;
1944         dp->dp_dirp = strndup(cp, len);
1945         if (dp->dp_dirp == NULL)
1946                 out_of_mem();
1947         *dpp = dp;
1948         return (dp->dp_dirp);
1949 }
1950
1951 /*
1952  * Hang the dir list element off the dirpath binary tree as required
1953  * and update the entry for host.
1954  */
1955 static void
1956 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep,
1957         int flags)
1958 {
1959         struct hostlist *hp;
1960         struct dirlist *dp2;
1961
1962         if (flags & OP_ALLDIRS) {
1963                 if (ep->ex_defdir)
1964                         free((caddr_t)dp);
1965                 else
1966                         ep->ex_defdir = dp;
1967                 if (grp == (struct grouplist *)NULL) {
1968                         ep->ex_defdir->dp_flag |= DP_DEFSET;
1969                         /* Save the default security flavors list. */
1970                         ep->ex_defnumsecflavors = ep->ex_numsecflavors;
1971                         if (ep->ex_numsecflavors > 0)
1972                                 memcpy(ep->ex_defsecflavors, ep->ex_secflavors,
1973                                     sizeof(ep->ex_secflavors));
1974                 } else while (grp) {
1975                         hp = get_ht();
1976                         hp->ht_grp = grp;
1977                         hp->ht_next = ep->ex_defdir->dp_hosts;
1978                         ep->ex_defdir->dp_hosts = hp;
1979                         /* Save the security flavors list for this host set. */
1980                         grp->gr_numsecflavors = ep->ex_numsecflavors;
1981                         if (ep->ex_numsecflavors > 0)
1982                                 memcpy(grp->gr_secflavors, ep->ex_secflavors,
1983                                     sizeof(ep->ex_secflavors));
1984                         grp = grp->gr_next;
1985                 }
1986         } else {
1987
1988                 /*
1989                  * Loop through the directories adding them to the tree.
1990                  */
1991                 while (dp) {
1992                         dp2 = dp->dp_left;
1993                         add_dlist(&ep->ex_dirl, dp, grp, flags, ep);
1994                         dp = dp2;
1995                 }
1996         }
1997 }
1998
1999 /*
2000  * Traverse the binary tree either updating a node that is already there
2001  * for the new directory or adding the new node.
2002  */
2003 static void
2004 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp,
2005         int flags, struct exportlist *ep)
2006 {
2007         struct dirlist *dp;
2008         struct hostlist *hp;
2009         int cmp;
2010
2011         dp = *dpp;
2012         if (dp) {
2013                 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp);
2014                 if (cmp > 0) {
2015                         add_dlist(&dp->dp_left, newdp, grp, flags, ep);
2016                         return;
2017                 } else if (cmp < 0) {
2018                         add_dlist(&dp->dp_right, newdp, grp, flags, ep);
2019                         return;
2020                 } else
2021                         free((caddr_t)newdp);
2022         } else {
2023                 dp = newdp;
2024                 dp->dp_left = (struct dirlist *)NULL;
2025                 *dpp = dp;
2026         }
2027         if (grp) {
2028
2029                 /*
2030                  * Hang all of the host(s) off of the directory point.
2031                  */
2032                 do {
2033                         hp = get_ht();
2034                         hp->ht_grp = grp;
2035                         hp->ht_next = dp->dp_hosts;
2036                         dp->dp_hosts = hp;
2037                         /* Save the security flavors list for this host set. */
2038                         grp->gr_numsecflavors = ep->ex_numsecflavors;
2039                         if (ep->ex_numsecflavors > 0)
2040                                 memcpy(grp->gr_secflavors, ep->ex_secflavors,
2041                                     sizeof(ep->ex_secflavors));
2042                         grp = grp->gr_next;
2043                 } while (grp);
2044         } else {
2045                 dp->dp_flag |= DP_DEFSET;
2046                 /* Save the default security flavors list. */
2047                 ep->ex_defnumsecflavors = ep->ex_numsecflavors;
2048                 if (ep->ex_numsecflavors > 0)
2049                         memcpy(ep->ex_defsecflavors, ep->ex_secflavors,
2050                             sizeof(ep->ex_secflavors));
2051         }
2052 }
2053
2054 /*
2055  * Search for a dirpath on the export point.
2056  */
2057 static struct dirlist *
2058 dirp_search(struct dirlist *dp, char *dirp)
2059 {
2060         int cmp;
2061
2062         if (dp) {
2063                 cmp = strcmp(dp->dp_dirp, dirp);
2064                 if (cmp > 0)
2065                         return (dirp_search(dp->dp_left, dirp));
2066                 else if (cmp < 0)
2067                         return (dirp_search(dp->dp_right, dirp));
2068                 else
2069                         return (dp);
2070         }
2071         return (dp);
2072 }
2073
2074 /*
2075  * Scan for a host match in a directory tree.
2076  */
2077 static int
2078 chk_host(struct dirlist *dp, struct sockaddr *saddr, int *defsetp,
2079         int *hostsetp, int *numsecflavors, int **secflavorsp)
2080 {
2081         struct hostlist *hp;
2082         struct grouplist *grp;
2083         struct addrinfo *ai;
2084
2085         if (dp) {
2086                 if (dp->dp_flag & DP_DEFSET)
2087                         *defsetp = dp->dp_flag;
2088                 hp = dp->dp_hosts;
2089                 while (hp) {
2090                         grp = hp->ht_grp;
2091                         switch (grp->gr_type) {
2092                         case GT_HOST:
2093                                 ai = grp->gr_ptr.gt_addrinfo;
2094                                 for (; ai; ai = ai->ai_next) {
2095                                         if (!sacmp(ai->ai_addr, saddr, NULL)) {
2096                                                 *hostsetp =
2097                                                     (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                                 }
2107                                 break;
2108                         case GT_NET:
2109                                 if (!sacmp(saddr, (struct sockaddr *)
2110                                     &grp->gr_ptr.gt_net.nt_net,
2111                                     (struct sockaddr *)
2112                                     &grp->gr_ptr.gt_net.nt_mask)) {
2113                                         *hostsetp = (hp->ht_flag | DP_HOSTSET);
2114                                         if (numsecflavors != NULL) {
2115                                                 *numsecflavors =
2116                                                     grp->gr_numsecflavors;
2117                                                 *secflavorsp =
2118                                                     grp->gr_secflavors;
2119                                         }
2120                                         return (1);
2121                                 }
2122                                 break;
2123                         }
2124                         hp = hp->ht_next;
2125                 }
2126         }
2127         return (0);
2128 }
2129
2130 /*
2131  * Scan tree for a host that matches the address.
2132  */
2133 static int
2134 scan_tree(struct dirlist *dp, struct sockaddr *saddr)
2135 {
2136         int defset, hostset;
2137
2138         if (dp) {
2139                 if (scan_tree(dp->dp_left, saddr))
2140                         return (1);
2141                 if (chk_host(dp, saddr, &defset, &hostset, NULL, NULL))
2142                         return (1);
2143                 if (scan_tree(dp->dp_right, saddr))
2144                         return (1);
2145         }
2146         return (0);
2147 }
2148
2149 /*
2150  * Traverse the dirlist tree and free it up.
2151  */
2152 static void
2153 free_dir(struct dirlist *dp)
2154 {
2155
2156         if (dp) {
2157                 free_dir(dp->dp_left);
2158                 free_dir(dp->dp_right);
2159                 free_host(dp->dp_hosts);
2160                 free(dp->dp_dirp);
2161                 free(dp);
2162         }
2163 }
2164
2165 /*
2166  * Parse a colon separated list of security flavors
2167  */
2168 static int
2169 parsesec(char *seclist, struct exportlist *ep)
2170 {
2171         char *cp, savedc;
2172         int flavor;
2173
2174         ep->ex_numsecflavors = 0;
2175         for (;;) {
2176                 cp = strchr(seclist, ':');
2177                 if (cp) {
2178                         savedc = *cp;
2179                         *cp = '\0';
2180                 }
2181
2182                 if (!strcmp(seclist, "sys"))
2183                         flavor = AUTH_SYS;
2184                 else if (!strcmp(seclist, "krb5"))
2185                         flavor = RPCSEC_GSS_KRB5;
2186                 else if (!strcmp(seclist, "krb5i"))
2187                         flavor = RPCSEC_GSS_KRB5I;
2188                 else if (!strcmp(seclist, "krb5p"))
2189                         flavor = RPCSEC_GSS_KRB5P;
2190                 else {
2191                         if (cp)
2192                                 *cp = savedc;
2193                         syslog(LOG_ERR, "bad sec flavor: %s", seclist);
2194                         return (1);
2195                 }
2196                 if (ep->ex_numsecflavors == MAXSECFLAVORS) {
2197                         if (cp)
2198                                 *cp = savedc;
2199                         syslog(LOG_ERR, "too many sec flavors: %s", seclist);
2200                         return (1);
2201                 }
2202                 ep->ex_secflavors[ep->ex_numsecflavors] = flavor;
2203                 ep->ex_numsecflavors++;
2204                 if (cp) {
2205                         *cp = savedc;
2206                         seclist = cp + 1;
2207                 } else {
2208                         break;
2209                 }
2210         }
2211         return (0);
2212 }
2213
2214 /*
2215  * Parse the option string and update fields.
2216  * Option arguments may either be -<option>=<value> or
2217  * -<option> <value>
2218  */
2219 static int
2220 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp,
2221         int *has_hostp, int *exflagsp, struct xucred *cr)
2222 {
2223         char *cpoptarg, *cpoptend;
2224         char *cp, *endcp, *cpopt, savedc, savedc2;
2225         int allflag, usedarg;
2226
2227         savedc2 = '\0';
2228         cpopt = *cpp;
2229         cpopt++;
2230         cp = *endcpp;
2231         savedc = *cp;
2232         *cp = '\0';
2233         while (cpopt && *cpopt) {
2234                 allflag = 1;
2235                 usedarg = -2;
2236                 if ((cpoptend = strchr(cpopt, ','))) {
2237                         *cpoptend++ = '\0';
2238                         if ((cpoptarg = strchr(cpopt, '=')))
2239                                 *cpoptarg++ = '\0';
2240                 } else {
2241                         if ((cpoptarg = strchr(cpopt, '=')))
2242                                 *cpoptarg++ = '\0';
2243                         else {
2244                                 *cp = savedc;
2245                                 nextfield(&cp, &endcp);
2246                                 **endcpp = '\0';
2247                                 if (endcp > cp && *cp != '-') {
2248                                         cpoptarg = cp;
2249                                         savedc2 = *endcp;
2250                                         *endcp = '\0';
2251                                         usedarg = 0;
2252                                 }
2253                         }
2254                 }
2255                 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) {
2256                         *exflagsp |= MNT_EXRDONLY;
2257                 } else if (cpoptarg && (!strcmp(cpopt, "maproot") ||
2258                     !(allflag = strcmp(cpopt, "mapall")) ||
2259                     !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) {
2260                         usedarg++;
2261                         parsecred(cpoptarg, cr);
2262                         if (allflag == 0) {
2263                                 *exflagsp |= MNT_EXPORTANON;
2264                                 opt_flags |= OP_MAPALL;
2265                         } else
2266                                 opt_flags |= OP_MAPROOT;
2267                 } else if (cpoptarg && (!strcmp(cpopt, "mask") ||
2268                     !strcmp(cpopt, "m"))) {
2269                         if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) {
2270                                 syslog(LOG_ERR, "bad mask: %s", cpoptarg);
2271                                 return (1);
2272                         }
2273                         usedarg++;
2274                         opt_flags |= OP_MASK;
2275                 } else if (cpoptarg && (!strcmp(cpopt, "network") ||
2276                         !strcmp(cpopt, "n"))) {
2277                         if (strchr(cpoptarg, '/') != NULL) {
2278                                 if (debug)
2279                                         fprintf(stderr, "setting OP_MASKLEN\n");
2280                                 opt_flags |= OP_MASKLEN;
2281                         }
2282                         if (grp->gr_type != GT_NULL) {
2283                                 syslog(LOG_ERR, "network/host conflict");
2284                                 return (1);
2285                         } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) {
2286                                 syslog(LOG_ERR, "bad net: %s", cpoptarg);
2287                                 return (1);
2288                         }
2289                         grp->gr_type = GT_NET;
2290                         *has_hostp = 1;
2291                         usedarg++;
2292                         opt_flags |= OP_NET;
2293                 } else if (!strcmp(cpopt, "alldirs")) {
2294                         opt_flags |= OP_ALLDIRS;
2295                 } else if (!strcmp(cpopt, "public")) {
2296                         *exflagsp |= MNT_EXPUBLIC;
2297                 } else if (!strcmp(cpopt, "webnfs")) {
2298                         *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON);
2299                         opt_flags |= OP_MAPALL;
2300                 } else if (cpoptarg && !strcmp(cpopt, "index")) {
2301                         ep->ex_indexfile = strdup(cpoptarg);
2302                 } else if (!strcmp(cpopt, "quiet")) {
2303                         opt_flags |= OP_QUIET;
2304                 } else if (cpoptarg && !strcmp(cpopt, "sec")) {
2305                         if (parsesec(cpoptarg, ep))
2306                                 return (1);
2307                         opt_flags |= OP_SEC;
2308                         usedarg++;
2309                 } else {
2310                         syslog(LOG_ERR, "bad opt %s", cpopt);
2311                         return (1);
2312                 }
2313                 if (usedarg >= 0) {
2314                         *endcp = savedc2;
2315                         **endcpp = savedc;
2316                         if (usedarg > 0) {
2317                                 *cpp = cp;
2318                                 *endcpp = endcp;
2319                         }
2320                         return (0);
2321                 }
2322                 cpopt = cpoptend;
2323         }
2324         **endcpp = savedc;
2325         return (0);
2326 }
2327
2328 /*
2329  * Translate a character string to the corresponding list of network
2330  * addresses for a hostname.
2331  */
2332 static int
2333 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp)
2334 {
2335         struct grouplist *checkgrp;
2336         struct addrinfo *ai, *tai, hints;
2337         int ecode;
2338         char host[NI_MAXHOST];
2339
2340         if (grp->gr_type != GT_NULL) {
2341                 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp);
2342                 return (1);
2343         }
2344         memset(&hints, 0, sizeof hints);
2345         hints.ai_flags = AI_CANONNAME;
2346         hints.ai_protocol = IPPROTO_UDP;
2347         ecode = getaddrinfo(cp, NULL, &hints, &ai);
2348         if (ecode != 0) {
2349                 syslog(LOG_ERR,"can't get address info for host %s", cp);
2350                 return 1;
2351         }
2352         grp->gr_ptr.gt_addrinfo = ai;
2353         while (ai != NULL) {
2354                 if (ai->ai_canonname == NULL) {
2355                         if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host,
2356                             sizeof host, NULL, 0, NI_NUMERICHOST) != 0)
2357                                 strlcpy(host, "?", sizeof(host));
2358                         ai->ai_canonname = strdup(host);
2359                         ai->ai_flags |= AI_CANONNAME;
2360                 }
2361                 if (debug)
2362                         fprintf(stderr, "got host %s\n", ai->ai_canonname);
2363                 /*
2364                  * Sanity check: make sure we don't already have an entry
2365                  * for this host in the grouplist.
2366                  */
2367                 for (checkgrp = tgrp; checkgrp != NULL;
2368                     checkgrp = checkgrp->gr_next) {
2369                         if (checkgrp->gr_type != GT_HOST)
2370                                 continue;
2371                         for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL;
2372                             tai = tai->ai_next) {
2373                                 if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0)
2374                                         continue;
2375                                 if (debug)
2376                                         fprintf(stderr,
2377                                             "ignoring duplicate host %s\n",
2378                                             ai->ai_canonname);
2379                                 grp->gr_type = GT_IGNORE;
2380                                 return (0);
2381                         }
2382                 }
2383                 ai = ai->ai_next;
2384         }
2385         grp->gr_type = GT_HOST;
2386         return (0);
2387 }
2388
2389 /*
2390  * Free up an exports list component
2391  */
2392 static void
2393 free_exp(struct exportlist *ep)
2394 {
2395
2396         if (ep->ex_defdir) {
2397                 free_host(ep->ex_defdir->dp_hosts);
2398                 free((caddr_t)ep->ex_defdir);
2399         }
2400         if (ep->ex_fsdir)
2401                 free(ep->ex_fsdir);
2402         if (ep->ex_indexfile)
2403                 free(ep->ex_indexfile);
2404         free_dir(ep->ex_dirl);
2405         free((caddr_t)ep);
2406 }
2407
2408 /*
2409  * Free hosts.
2410  */
2411 static void
2412 free_host(struct hostlist *hp)
2413 {
2414         struct hostlist *hp2;
2415
2416         while (hp) {
2417                 hp2 = hp;
2418                 hp = hp->ht_next;
2419                 free((caddr_t)hp2);
2420         }
2421 }
2422
2423 static struct hostlist *
2424 get_ht(void)
2425 {
2426         struct hostlist *hp;
2427
2428         hp = (struct hostlist *)malloc(sizeof (struct hostlist));
2429         if (hp == (struct hostlist *)NULL)
2430                 out_of_mem();
2431         hp->ht_next = (struct hostlist *)NULL;
2432         hp->ht_flag = 0;
2433         return (hp);
2434 }
2435
2436 /*
2437  * Out of memory, fatal
2438  */
2439 static void
2440 out_of_mem(void)
2441 {
2442
2443         syslog(LOG_ERR, "out of memory");
2444         exit(2);
2445 }
2446
2447 /*
2448  * Do the nmount() syscall with the update flag to push the export info into
2449  * the kernel.
2450  */
2451 static int
2452 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags,
2453     struct xucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb)
2454 {
2455         struct statfs fsb1;
2456         struct addrinfo *ai;
2457         struct export_args *eap;
2458         char errmsg[255];
2459         char *cp;
2460         int done;
2461         char savedc;
2462         struct iovec *iov;
2463         int i, iovlen;
2464         int ret;
2465         struct nfsex_args nfsea;
2466
2467         eap = &nfsea.export;
2468
2469         cp = NULL;
2470         savedc = '\0';
2471         iov = NULL;
2472         iovlen = 0;
2473         ret = 0;
2474
2475         bzero(eap, sizeof (struct export_args));
2476         bzero(errmsg, sizeof(errmsg));
2477         eap->ex_flags = exflags;
2478         eap->ex_anon = *anoncrp;
2479         eap->ex_indexfile = ep->ex_indexfile;
2480         if (grp->gr_type == GT_HOST)
2481                 ai = grp->gr_ptr.gt_addrinfo;
2482         else
2483                 ai = NULL;
2484         eap->ex_numsecflavors = ep->ex_numsecflavors;
2485         for (i = 0; i < eap->ex_numsecflavors; i++)
2486                 eap->ex_secflavors[i] = ep->ex_secflavors[i];
2487         if (eap->ex_numsecflavors == 0) {
2488                 eap->ex_numsecflavors = 1;
2489                 eap->ex_secflavors[0] = AUTH_SYS;
2490         }
2491         done = FALSE;
2492
2493         if (v4root_phase == 0) {
2494                 build_iovec(&iov, &iovlen, "fstype", NULL, 0);
2495                 build_iovec(&iov, &iovlen, "fspath", NULL, 0);
2496                 build_iovec(&iov, &iovlen, "from", NULL, 0);
2497                 build_iovec(&iov, &iovlen, "update", NULL, 0);
2498                 build_iovec(&iov, &iovlen, "export", eap,
2499                     sizeof (struct export_args));
2500                 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
2501         }
2502
2503         while (!done) {
2504                 switch (grp->gr_type) {
2505                 case GT_HOST:
2506                         if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0)
2507                                 goto skip;
2508                         eap->ex_addr = ai->ai_addr;
2509                         eap->ex_addrlen = ai->ai_addrlen;
2510                         eap->ex_masklen = 0;
2511                         break;
2512                 case GT_NET:
2513                         if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 &&
2514                             have_v6 == 0)
2515                                 goto skip;
2516                         eap->ex_addr =
2517                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net;
2518                         eap->ex_addrlen =
2519                             ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_net)->sa_len;
2520                         eap->ex_mask =
2521                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask;
2522                         eap->ex_masklen = ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask)->sa_len;
2523                         break;
2524                 case GT_DEFAULT:
2525                         eap->ex_addr = NULL;
2526                         eap->ex_addrlen = 0;
2527                         eap->ex_mask = NULL;
2528                         eap->ex_masklen = 0;
2529                         break;
2530                 case GT_IGNORE:
2531                         ret = 0;
2532                         goto error_exit;
2533                         break;
2534                 default:
2535                         syslog(LOG_ERR, "bad grouptype");
2536                         if (cp)
2537                                 *cp = savedc;
2538                         ret = 1;
2539                         goto error_exit;
2540                 }
2541
2542                 /*
2543                  * For V4:, use the nfssvc() syscall, instead of mount().
2544                  */
2545                 if (v4root_phase == 2) {
2546                         nfsea.fspec = v4root_dirpath;
2547                         if (nfssvc(NFSSVC_V4ROOTEXPORT, (caddr_t)&nfsea) < 0) {
2548                                 syslog(LOG_ERR, "Exporting V4: failed");
2549                                 return (2);
2550                         }
2551                 } else {
2552                         /*
2553                          * XXX:
2554                          * Maybe I should just use the fsb->f_mntonname path
2555                          * instead of looping back up the dirp to the mount
2556                          * point??
2557                          * Also, needs to know how to export all types of local
2558                          * exportable filesystems and not just "ufs".
2559                          */
2560                         iov[1].iov_base = fsb->f_fstypename; /* "fstype" */
2561                         iov[1].iov_len = strlen(fsb->f_fstypename) + 1;
2562                         iov[3].iov_base = fsb->f_mntonname; /* "fspath" */
2563                         iov[3].iov_len = strlen(fsb->f_mntonname) + 1;
2564                         iov[5].iov_base = fsb->f_mntfromname; /* "from" */
2565                         iov[5].iov_len = strlen(fsb->f_mntfromname) + 1;
2566                         errmsg[0] = '\0';
2567
2568                         while (nmount(iov, iovlen, fsb->f_flags) < 0) {
2569                                 if (cp)
2570                                         *cp-- = savedc;
2571                                 else
2572                                         cp = dirp + dirplen - 1;
2573                                 if (opt_flags & OP_QUIET) {
2574                                         ret = 1;
2575                                         goto error_exit;
2576                                 }
2577                                 if (errno == EPERM) {
2578                                         if (debug)
2579                                                 warnx("can't change attributes for %s: %s",
2580                                                     dirp, errmsg);
2581                                         syslog(LOG_ERR,
2582                                            "can't change attributes for %s: %s",
2583                                             dirp, errmsg);
2584                                         ret = 1;
2585                                         goto error_exit;
2586                                 }
2587                                 if (opt_flags & OP_ALLDIRS) {
2588                                         if (errno == EINVAL)
2589                                                 syslog(LOG_ERR,
2590                 "-alldirs requested but %s is not a filesystem mountpoint",
2591                                                     dirp);
2592                                         else
2593                                                 syslog(LOG_ERR,
2594                                                     "could not remount %s: %m",
2595                                                     dirp);
2596                                         ret = 1;
2597                                         goto error_exit;
2598                                 }
2599                                 /* back up over the last component */
2600                                 while (*cp == '/' && cp > dirp)
2601                                         cp--;
2602                                 while (*(cp - 1) != '/' && cp > dirp)
2603                                         cp--;
2604                                 if (cp == dirp) {
2605                                         if (debug)
2606                                                 warnx("mnt unsucc");
2607                                         syslog(LOG_ERR, "can't export %s %s",
2608                                             dirp, errmsg);
2609                                         ret = 1;
2610                                         goto error_exit;
2611                                 }
2612                                 savedc = *cp;
2613                                 *cp = '\0';
2614                                 /*
2615                                  * Check that we're still on the same
2616                                  * filesystem.
2617                                  */
2618                                 if (statfs(dirp, &fsb1) != 0 ||
2619                                     bcmp(&fsb1.f_fsid, &fsb->f_fsid,
2620                                     sizeof (fsb1.f_fsid)) != 0) {
2621                                         *cp = savedc;
2622                                         syslog(LOG_ERR,
2623                                             "can't export %s %s", dirp,
2624                                             errmsg);
2625                                         ret = 1;
2626                                         goto error_exit;
2627                                 }
2628                         }
2629                 }
2630
2631                 /*
2632                  * For the experimental server:
2633                  * If this is the public directory, get the file handle
2634                  * and load it into the kernel via the nfssvc() syscall.
2635                  */
2636                 if ((exflags & MNT_EXPUBLIC) != 0) {
2637                         fhandle_t fh;
2638                         char *public_name;
2639
2640                         if (eap->ex_indexfile != NULL)
2641                                 public_name = eap->ex_indexfile;
2642                         else
2643                                 public_name = dirp;
2644                         if (getfh(public_name, &fh) < 0)
2645                                 syslog(LOG_ERR,
2646                                     "Can't get public fh for %s", public_name);
2647                         else if (nfssvc(NFSSVC_PUBLICFH, (caddr_t)&fh) < 0)
2648                                 syslog(LOG_ERR,
2649                                     "Can't set public fh for %s", public_name);
2650                         else
2651                                 has_publicfh = 1;
2652                 }
2653 skip:
2654                 if (ai != NULL)
2655                         ai = ai->ai_next;
2656                 if (ai == NULL)
2657                         done = TRUE;
2658         }
2659         if (cp)
2660                 *cp = savedc;
2661 error_exit:
2662         /* free strings allocated by strdup() in getmntopts.c */
2663         if (iov != NULL) {
2664                 free(iov[0].iov_base); /* fstype */
2665                 free(iov[2].iov_base); /* fspath */
2666                 free(iov[4].iov_base); /* from */
2667                 free(iov[6].iov_base); /* update */
2668                 free(iov[8].iov_base); /* export */
2669                 free(iov[10].iov_base); /* errmsg */
2670
2671                 /* free iov, allocated by realloc() */
2672                 free(iov);
2673         }
2674         return (ret);
2675 }
2676
2677 /*
2678  * Translate a net address.
2679  *
2680  * If `maskflg' is nonzero, then `cp' is a netmask, not a network address.
2681  */
2682 static int
2683 get_net(char *cp, struct netmsk *net, int maskflg)
2684 {
2685         struct netent *np = NULL;
2686         char *name, *p, *prefp;
2687         struct sockaddr_in sin;
2688         struct sockaddr *sa = NULL;
2689         struct addrinfo hints, *ai = NULL;
2690         char netname[NI_MAXHOST];
2691         long preflen;
2692
2693         p = prefp = NULL;
2694         if ((opt_flags & OP_MASKLEN) && !maskflg) {
2695                 p = strchr(cp, '/');
2696                 *p = '\0';
2697                 prefp = p + 1;
2698         }
2699
2700         /*
2701          * Check for a numeric address first. We wish to avoid
2702          * possible DNS lookups in getnetbyname().
2703          */
2704         if (isxdigit(*cp) || *cp == ':') {
2705                 memset(&hints, 0, sizeof hints);
2706                 /* Ensure the mask and the network have the same family. */
2707                 if (maskflg && (opt_flags & OP_NET))
2708                         hints.ai_family = net->nt_net.ss_family;
2709                 else if (!maskflg && (opt_flags & OP_HAVEMASK))
2710                         hints.ai_family = net->nt_mask.ss_family;
2711                 else
2712                         hints.ai_family = AF_UNSPEC;
2713                 hints.ai_flags = AI_NUMERICHOST;
2714                 if (getaddrinfo(cp, NULL, &hints, &ai) == 0)
2715                         sa = ai->ai_addr;
2716                 if (sa != NULL && ai->ai_family == AF_INET) {
2717                         /*
2718                          * The address in `cp' is really a network address, so
2719                          * use inet_network() to re-interpret this correctly.
2720                          * e.g. "127.1" means 127.1.0.0, not 127.0.0.1.
2721                          */
2722                         bzero(&sin, sizeof sin);
2723                         sin.sin_family = AF_INET;
2724                         sin.sin_len = sizeof sin;
2725                         sin.sin_addr = inet_makeaddr(inet_network(cp), 0);
2726                         if (debug)
2727                                 fprintf(stderr, "get_net: v4 addr %s\n",
2728                                     inet_ntoa(sin.sin_addr));
2729                         sa = (struct sockaddr *)&sin;
2730                 }
2731         }
2732         if (sa == NULL && (np = getnetbyname(cp)) != NULL) {
2733                 bzero(&sin, sizeof sin);
2734                 sin.sin_family = AF_INET;
2735                 sin.sin_len = sizeof sin;
2736                 sin.sin_addr = inet_makeaddr(np->n_net, 0);
2737                 sa = (struct sockaddr *)&sin;
2738         }
2739         if (sa == NULL)
2740                 goto fail;
2741
2742         if (maskflg) {
2743                 /* The specified sockaddr is a mask. */
2744                 if (checkmask(sa) != 0)
2745                         goto fail;
2746                 bcopy(sa, &net->nt_mask, sa->sa_len);
2747                 opt_flags |= OP_HAVEMASK;
2748         } else {
2749                 /* The specified sockaddr is a network address. */
2750                 bcopy(sa, &net->nt_net, sa->sa_len);
2751
2752                 /* Get a network name for the export list. */
2753                 if (np) {
2754                         name = np->n_name;
2755                 } else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname,
2756                    NULL, 0, NI_NUMERICHOST) == 0) {
2757                         name = netname;
2758                 } else {
2759                         goto fail;
2760                 }
2761                 if ((net->nt_name = strdup(name)) == NULL)
2762                         out_of_mem();
2763
2764                 /*
2765                  * Extract a mask from either a "/<masklen>" suffix, or
2766                  * from the class of an IPv4 address.
2767                  */
2768                 if (opt_flags & OP_MASKLEN) {
2769                         preflen = strtol(prefp, NULL, 10);
2770                         if (preflen < 0L || preflen == LONG_MAX)
2771                                 goto fail;
2772                         bcopy(sa, &net->nt_mask, sa->sa_len);
2773                         if (makemask(&net->nt_mask, (int)preflen) != 0)
2774                                 goto fail;
2775                         opt_flags |= OP_HAVEMASK;
2776                         *p = '/';
2777                 } else if (sa->sa_family == AF_INET &&
2778                     (opt_flags & OP_MASK) == 0) {
2779                         in_addr_t addr;
2780
2781                         addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
2782                         if (IN_CLASSA(addr))
2783                                 preflen = 8;
2784                         else if (IN_CLASSB(addr))
2785                                 preflen = 16;
2786                         else if (IN_CLASSC(addr))
2787                                 preflen = 24;
2788                         else if (IN_CLASSD(addr))
2789                                 preflen = 28;
2790                         else
2791                                 preflen = 32;   /* XXX */
2792
2793                         bcopy(sa, &net->nt_mask, sa->sa_len);
2794                         makemask(&net->nt_mask, (int)preflen);
2795                         opt_flags |= OP_HAVEMASK;
2796                 }
2797         }
2798
2799         if (ai)
2800                 freeaddrinfo(ai);
2801         return 0;
2802
2803 fail:
2804         if (ai)
2805                 freeaddrinfo(ai);
2806         return 1;
2807 }
2808
2809 /*
2810  * Parse out the next white space separated field
2811  */
2812 static void
2813 nextfield(char **cp, char **endcp)
2814 {
2815         char *p;
2816
2817         p = *cp;
2818         while (*p == ' ' || *p == '\t')
2819                 p++;
2820         if (*p == '\n' || *p == '\0')
2821                 *cp = *endcp = p;
2822         else {
2823                 *cp = p++;
2824                 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
2825                         p++;
2826                 *endcp = p;
2827         }
2828 }
2829
2830 /*
2831  * Get an exports file line. Skip over blank lines and handle line
2832  * continuations.
2833  */
2834 static int
2835 get_line(void)
2836 {
2837         char *p, *cp;
2838         size_t len;
2839         int totlen, cont_line;
2840
2841         /*
2842          * Loop around ignoring blank lines and getting all continuation lines.
2843          */
2844         p = line;
2845         totlen = 0;
2846         do {
2847                 if ((p = fgetln(exp_file, &len)) == NULL)
2848                         return (0);
2849                 cp = p + len - 1;
2850                 cont_line = 0;
2851                 while (cp >= p &&
2852                     (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) {
2853                         if (*cp == '\\')
2854                                 cont_line = 1;
2855                         cp--;
2856                         len--;
2857                 }
2858                 if (cont_line) {
2859                         *++cp = ' ';
2860                         len++;
2861                 }
2862                 if (linesize < len + totlen + 1) {
2863                         linesize = len + totlen + 1;
2864                         line = realloc(line, linesize);
2865                         if (line == NULL)
2866                                 out_of_mem();
2867                 }
2868                 memcpy(line + totlen, p, len);
2869                 totlen += len;
2870                 line[totlen] = '\0';
2871         } while (totlen == 0 || cont_line);
2872         return (1);
2873 }
2874
2875 /*
2876  * Parse a description of a credential.
2877  */
2878 static void
2879 parsecred(char *namelist, struct xucred *cr)
2880 {
2881         char *name;
2882         int cnt;
2883         char *names;
2884         struct passwd *pw;
2885         struct group *gr;
2886         gid_t groups[XU_NGROUPS + 1];
2887         int ngroups;
2888
2889         cr->cr_version = XUCRED_VERSION;
2890         /*
2891          * Set up the unprivileged user.
2892          */
2893         cr->cr_uid = -2;
2894         cr->cr_groups[0] = -2;
2895         cr->cr_ngroups = 1;
2896         /*
2897          * Get the user's password table entry.
2898          */
2899         names = strsep_quote(&namelist, " \t\n");
2900         name = strsep(&names, ":");
2901         /* Bug?  name could be NULL here */
2902         if (isdigit(*name) || *name == '-')
2903                 pw = getpwuid(atoi(name));
2904         else
2905                 pw = getpwnam(name);
2906         /*
2907          * Credentials specified as those of a user.
2908          */
2909         if (names == NULL) {
2910                 if (pw == NULL) {
2911                         syslog(LOG_ERR, "unknown user: %s", name);
2912                         return;
2913                 }
2914                 cr->cr_uid = pw->pw_uid;
2915                 ngroups = XU_NGROUPS + 1;
2916                 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups))
2917                         syslog(LOG_ERR, "too many groups");
2918                 /*
2919                  * Compress out duplicate.
2920                  */
2921                 cr->cr_ngroups = ngroups - 1;
2922                 cr->cr_groups[0] = groups[0];
2923                 for (cnt = 2; cnt < ngroups; cnt++)
2924                         cr->cr_groups[cnt - 1] = groups[cnt];
2925                 return;
2926         }
2927         /*
2928          * Explicit credential specified as a colon separated list:
2929          *      uid:gid:gid:...
2930          */
2931         if (pw != NULL)
2932                 cr->cr_uid = pw->pw_uid;
2933         else if (isdigit(*name) || *name == '-')
2934                 cr->cr_uid = atoi(name);
2935         else {
2936                 syslog(LOG_ERR, "unknown user: %s", name);
2937                 return;
2938         }
2939         cr->cr_ngroups = 0;
2940         while (names != NULL && *names != '\0' && cr->cr_ngroups < XU_NGROUPS) {
2941                 name = strsep(&names, ":");
2942                 if (isdigit(*name) || *name == '-') {
2943                         cr->cr_groups[cr->cr_ngroups++] = atoi(name);
2944                 } else {
2945                         if ((gr = getgrnam(name)) == NULL) {
2946                                 syslog(LOG_ERR, "unknown group: %s", name);
2947                                 continue;
2948                         }
2949                         cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid;
2950                 }
2951         }
2952         if (names != NULL && *names != '\0' && cr->cr_ngroups == XU_NGROUPS)
2953                 syslog(LOG_ERR, "too many groups");
2954 }
2955
2956 #define STRSIZ  (MNTNAMLEN+MNTPATHLEN+50)
2957 /*
2958  * Routines that maintain the remote mounttab
2959  */
2960 static void
2961 get_mountlist(void)
2962 {
2963         struct mountlist *mlp;
2964         char *host, *dirp, *cp;
2965         char str[STRSIZ];
2966         FILE *mlfile;
2967
2968         if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) {
2969                 if (errno == ENOENT)
2970                         return;
2971                 else {
2972                         syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST);
2973                         return;
2974                 }
2975         }
2976         while (fgets(str, STRSIZ, mlfile) != NULL) {
2977                 cp = str;
2978                 host = strsep(&cp, " \t\n");
2979                 dirp = strsep(&cp, " \t\n");
2980                 if (host == NULL || dirp == NULL)
2981                         continue;
2982                 mlp = (struct mountlist *)malloc(sizeof (*mlp));
2983                 if (mlp == (struct mountlist *)NULL)
2984                         out_of_mem();
2985                 strncpy(mlp->ml_host, host, MNTNAMLEN);
2986                 mlp->ml_host[MNTNAMLEN] = '\0';
2987                 strncpy(mlp->ml_dirp, dirp, MNTPATHLEN);
2988                 mlp->ml_dirp[MNTPATHLEN] = '\0';
2989
2990                 SLIST_INSERT_HEAD(&mlhead, mlp, next);
2991         }
2992         fclose(mlfile);
2993 }
2994
2995 static void
2996 del_mlist(char *hostp, char *dirp)
2997 {
2998         struct mountlist *mlp, *mlp2;
2999         FILE *mlfile;
3000         int fnd = 0;
3001
3002         SLIST_FOREACH_SAFE(mlp, &mlhead, next, mlp2) {
3003                 if (!strcmp(mlp->ml_host, hostp) &&
3004                     (!dirp || !strcmp(mlp->ml_dirp, dirp))) {
3005                         fnd = 1;
3006                         SLIST_REMOVE(&mlhead, mlp, mountlist, next);
3007                         free((caddr_t)mlp);
3008                 }
3009         }
3010         if (fnd) {
3011                 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) {
3012                         syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST);
3013                         return;
3014                 }
3015                 SLIST_FOREACH(mlp, &mlhead, next) {
3016                         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
3017                 }
3018                 fclose(mlfile);
3019         }
3020 }
3021
3022 static void
3023 add_mlist(char *hostp, char *dirp)
3024 {
3025         struct mountlist *mlp;
3026         FILE *mlfile;
3027
3028         SLIST_FOREACH(mlp, &mlhead, next) {
3029                 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp))
3030                         return;
3031         }
3032
3033         mlp = (struct mountlist *)malloc(sizeof (*mlp));
3034         if (mlp == (struct mountlist *)NULL)
3035                 out_of_mem();
3036         strncpy(mlp->ml_host, hostp, MNTNAMLEN);
3037         mlp->ml_host[MNTNAMLEN] = '\0';
3038         strncpy(mlp->ml_dirp, dirp, MNTPATHLEN);
3039         mlp->ml_dirp[MNTPATHLEN] = '\0';
3040         SLIST_INSERT_HEAD(&mlhead, mlp, next);
3041         if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
3042                 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST);
3043                 return;
3044         }
3045         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
3046         fclose(mlfile);
3047 }
3048
3049 /*
3050  * Free up a group list.
3051  */
3052 static void
3053 free_grp(struct grouplist *grp)
3054 {
3055         if (grp->gr_type == GT_HOST) {
3056                 if (grp->gr_ptr.gt_addrinfo != NULL)
3057                         freeaddrinfo(grp->gr_ptr.gt_addrinfo);
3058         } else if (grp->gr_type == GT_NET) {
3059                 if (grp->gr_ptr.gt_net.nt_name)
3060                         free(grp->gr_ptr.gt_net.nt_name);
3061         }
3062         free((caddr_t)grp);
3063 }
3064
3065 #ifdef DEBUG
3066 static void
3067 SYSLOG(int pri, const char *fmt, ...)
3068 {
3069         va_list ap;
3070
3071         va_start(ap, fmt);
3072         vfprintf(stderr, fmt, ap);
3073         va_end(ap);
3074 }
3075 #endif /* DEBUG */
3076
3077 /*
3078  * Check options for consistency.
3079  */
3080 static int
3081 check_options(struct dirlist *dp)
3082 {
3083
3084         if (v4root_phase == 0 && dp == NULL)
3085             return (1);
3086         if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL)) {
3087             syslog(LOG_ERR, "-mapall and -maproot mutually exclusive");
3088             return (1);
3089         }
3090         if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) {
3091                 syslog(LOG_ERR, "-mask requires -network");
3092                 return (1);
3093         }
3094         if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) {
3095                 syslog(LOG_ERR, "-network requires mask specification");
3096                 return (1);
3097         }
3098         if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) {
3099                 syslog(LOG_ERR, "-mask and /masklen are mutually exclusive");
3100                 return (1);
3101         }
3102         if (v4root_phase > 0 &&
3103             (opt_flags &
3104              ~(OP_SEC | OP_MASK | OP_NET | OP_HAVEMASK | OP_MASKLEN)) != 0) {
3105             syslog(LOG_ERR,"only -sec,-net,-mask options allowed on V4:");
3106             return (1);
3107         }
3108         if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
3109             syslog(LOG_ERR, "-alldirs has multiple directories");
3110             return (1);
3111         }
3112         return (0);
3113 }
3114
3115 /*
3116  * Check an absolute directory path for any symbolic links. Return true
3117  */
3118 static int
3119 check_dirpath(char *dirp)
3120 {
3121         char *cp;
3122         int ret = 1;
3123         struct stat sb;
3124
3125         cp = dirp + 1;
3126         while (*cp && ret) {
3127                 if (*cp == '/') {
3128                         *cp = '\0';
3129                         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
3130                                 ret = 0;
3131                         *cp = '/';
3132                 }
3133                 cp++;
3134         }
3135         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
3136                 ret = 0;
3137         return (ret);
3138 }
3139
3140 /*
3141  * Make a netmask according to the specified prefix length. The ss_family
3142  * and other non-address fields must be initialised before calling this.
3143  */
3144 static int
3145 makemask(struct sockaddr_storage *ssp, int bitlen)
3146 {
3147         u_char *p;
3148         int bits, i, len;
3149
3150         if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL)
3151                 return (-1);
3152         if (bitlen > len * CHAR_BIT)
3153                 return (-1);
3154
3155         for (i = 0; i < len; i++) {
3156                 bits = MIN(CHAR_BIT, bitlen);
3157                 *p++ = (u_char)~0 << (CHAR_BIT - bits);
3158                 bitlen -= bits;
3159         }
3160         return 0;
3161 }
3162
3163 /*
3164  * Check that the sockaddr is a valid netmask. Returns 0 if the mask
3165  * is acceptable (i.e. of the form 1...10....0).
3166  */
3167 static int
3168 checkmask(struct sockaddr *sa)
3169 {
3170         u_char *mask;
3171         int i, len;
3172
3173         if ((mask = sa_rawaddr(sa, &len)) == NULL)
3174                 return (-1);
3175
3176         for (i = 0; i < len; i++)
3177                 if (mask[i] != 0xff)
3178                         break;
3179         if (i < len) {
3180                 if (~mask[i] & (u_char)(~mask[i] + 1))
3181                         return (-1);
3182                 i++;
3183         }
3184         for (; i < len; i++)
3185                 if (mask[i] != 0)
3186                         return (-1);
3187         return (0);
3188 }
3189
3190 /*
3191  * Compare two sockaddrs according to a specified mask. Return zero if
3192  * `sa1' matches `sa2' when filtered by the netmask in `samask'.
3193  * If samask is NULL, perform a full comparison.
3194  */
3195 static int
3196 sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask)
3197 {
3198         unsigned char *p1, *p2, *mask;
3199         int len, i;
3200
3201         if (sa1->sa_family != sa2->sa_family ||
3202             (p1 = sa_rawaddr(sa1, &len)) == NULL ||
3203             (p2 = sa_rawaddr(sa2, NULL)) == NULL)
3204                 return (1);
3205
3206         switch (sa1->sa_family) {
3207         case AF_INET6:
3208                 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
3209                     ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
3210                         return (1);
3211                 break;
3212         }
3213
3214         /* Simple binary comparison if no mask specified. */
3215         if (samask == NULL)
3216                 return (memcmp(p1, p2, len));
3217
3218         /* Set up the mask, and do a mask-based comparison. */
3219         if (sa1->sa_family != samask->sa_family ||
3220             (mask = sa_rawaddr(samask, NULL)) == NULL)
3221                 return (1);
3222
3223         for (i = 0; i < len; i++)
3224                 if ((p1[i] & mask[i]) != (p2[i] & mask[i]))
3225                         return (1);
3226         return (0);
3227 }
3228
3229 /*
3230  * Return a pointer to the part of the sockaddr that contains the
3231  * raw address, and set *nbytes to its length in bytes. Returns
3232  * NULL if the address family is unknown.
3233  */
3234 static void *
3235 sa_rawaddr(struct sockaddr *sa, int *nbytes) {
3236         void *p;
3237         int len;
3238
3239         switch (sa->sa_family) {
3240         case AF_INET:
3241                 len = sizeof(((struct sockaddr_in *)sa)->sin_addr);
3242                 p = &((struct sockaddr_in *)sa)->sin_addr;
3243                 break;
3244         case AF_INET6:
3245                 len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr);
3246                 p = &((struct sockaddr_in6 *)sa)->sin6_addr;
3247                 break;
3248         default:
3249                 p = NULL;
3250                 len = 0;
3251         }
3252
3253         if (nbytes != NULL)
3254                 *nbytes = len;
3255         return (p);
3256 }
3257
3258 static void
3259 huphandler(int sig __unused)
3260 {
3261
3262         got_sighup = 1;
3263 }
3264
3265 static void
3266 terminate(int sig __unused)
3267 {
3268         pidfile_remove(pfh);
3269         rpcb_unset(MOUNTPROG, MOUNTVERS, NULL);
3270         rpcb_unset(MOUNTPROG, MOUNTVERS3, NULL);
3271         exit (0);
3272 }