usr.sbin/mountd/mountd.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1989, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Herb Hasler and Rick Macklem at The University of Guelph.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #ifndef lint
  36 static const char copyright[] =
  37 "@(#) Copyright (c) 1989, 1993\n\
  38         The Regents of the University of California.  All rights reserved.\n";
  39 #endif /*not lint*/
  40
  41 #if 0
  42 #ifndef lint
  43 static char sccsid[] = "@(#)mountd.c    8.15 (Berkeley) 5/1/95";
  44 #endif /*not lint*/
  45 #endif
  46
  47 #include <sys/cdefs.h>
  48 __FBSDID("$FreeBSD$");
  49
  50 #include <sys/param.h>
  51 #include <sys/fcntl.h>
  52 #include <sys/linker.h>
  53 #include <sys/module.h>
  54 #include <sys/mount.h>
  55 #include <sys/queue.h>
  56 #include <sys/stat.h>
  57 #include <sys/sysctl.h>
  58 #include <sys/syslog.h>
  59
  60 #include <rpc/rpc.h>
  61 #include <rpc/rpc_com.h>
  62 #include <rpc/pmap_clnt.h>
  63 #include <rpc/pmap_prot.h>
  64 #include <rpcsvc/mount.h>
  65 #include <nfs/nfsproto.h>
  66 #include <nfs/nfssvc.h>
  67 #include <nfsserver/nfs.h>
  68
  69 #include <fs/nfs/nfsport.h>
  70
  71 #include <arpa/inet.h>
  72
  73 #include <ctype.h>
  74 #include <err.h>
  75 #include <errno.h>
  76 #include <grp.h>
  77 #include <libutil.h>
  78 #include <limits.h>
  79 #include <netdb.h>
  80 #include <pwd.h>
  81 #include <signal.h>
  82 #include <stdio.h>
  83 #include <stdlib.h>
  84 #include <string.h>
  85 #include <unistd.h>
  86 #include "pathnames.h"
  87 #include "mntopts.h"
  88
  89 #ifdef DEBUG
  90 #include <stdarg.h>
  91 #endif
  92
  93 /*
  94  * Structures for keeping the mount list and export list
  95  */
  96 struct mountlist {
  97         char    ml_host[MNTNAMLEN+1];
  98         char    ml_dirp[MNTPATHLEN+1];
  99
 100         SLIST_ENTRY(mountlist)  next;
 101 };
 102
 103 struct dirlist {
 104         struct dirlist  *dp_left;
 105         struct dirlist  *dp_right;
 106         int             dp_flag;
 107         struct hostlist *dp_hosts;      /* List of hosts this dir exported to */
 108         char            *dp_dirp;
 109 };
 110 /* dp_flag bits */
 111 #define DP_DEFSET       0x1
 112 #define DP_HOSTSET      0x2
 113
 114 struct exportlist {
 115         struct dirlist  *ex_dirl;
 116         struct dirlist  *ex_defdir;
 117         int             ex_flag;
 118         fsid_t          ex_fs;
 119         char            *ex_fsdir;
 120         char            *ex_indexfile;
 121         int             ex_numsecflavors;
 122         int             ex_secflavors[MAXSECFLAVORS];
 123         int             ex_defnumsecflavors;
 124         int             ex_defsecflavors[MAXSECFLAVORS];
 125
 126         SLIST_ENTRY(exportlist) entries;
 127 };
 128 /* ex_flag bits */
 129 #define EX_LINKED       0x1
 130
 131 struct netmsk {
 132         struct sockaddr_storage nt_net;
 133         struct sockaddr_storage nt_mask;
 134         char            *nt_name;
 135 };
 136
 137 union grouptypes {
 138         struct addrinfo *gt_addrinfo;
 139         struct netmsk   gt_net;
 140 };
 141
 142 struct grouplist {
 143         int gr_type;
 144         union grouptypes gr_ptr;
 145         struct grouplist *gr_next;
 146         int gr_numsecflavors;
 147         int gr_secflavors[MAXSECFLAVORS];
 148 };
 149 /* Group types */
 150 #define GT_NULL         0x0
 151 #define GT_HOST         0x1
 152 #define GT_NET          0x2
 153 #define GT_DEFAULT      0x3
 154 #define GT_IGNORE       0x5
 155
 156 struct hostlist {
 157         int              ht_flag;       /* Uses DP_xx bits */
 158         struct grouplist *ht_grp;
 159         struct hostlist  *ht_next;
 160 };
 161
 162 struct fhreturn {
 163         int     fhr_flag;
 164         int     fhr_vers;
 165         nfsfh_t fhr_fh;
 166         int     fhr_numsecflavors;
 167         int     *fhr_secflavors;
 168 };
 169
 170 #define GETPORT_MAXTRY  20      /* Max tries to get a port # */
 171
 172 /* Global defs */
 173 static char     *add_expdir(struct dirlist **, char *, int);
 174 static void     add_dlist(struct dirlist **, struct dirlist *,
 175                     struct grouplist *, int, struct exportlist *);
 176 static void     add_mlist(char *, char *);
 177 static int      check_dirpath(char *);
 178 static int      check_options(struct dirlist *);
 179 static int      checkmask(struct sockaddr *sa);
 180 static int      chk_host(struct dirlist *, struct sockaddr *, int *, int *,
 181                     int *, int **);
 182 static char     *strsep_quote(char **stringp, const char *delim);
 183 static int      create_service(struct netconfig *nconf);
 184 static void     complete_service(struct netconfig *nconf, char *port_str);
 185 static void     clearout_service(void);
 186 static void     del_mlist(char *hostp, char *dirp);
 187 static struct dirlist   *dirp_search(struct dirlist *, char *);
 188 static int      do_mount(struct exportlist *, struct grouplist *, int,
 189                     struct xucred *, char *, int, struct statfs *);
 190 static int      do_opt(char **, char **, struct exportlist *,
 191                     struct grouplist *, int *, int *, struct xucred *);
 192 static struct exportlist        *ex_search(fsid_t *);
 193 static struct exportlist        *get_exp(void);
 194 static void     free_dir(struct dirlist *);
 195 static void     free_exp(struct exportlist *);
 196 static void     free_grp(struct grouplist *);
 197 static void     free_host(struct hostlist *);
 198 static void     get_exportlist(void);
 199 static int      get_host(char *, struct grouplist *, struct grouplist *);
 200 static struct hostlist *get_ht(void);
 201 static int      get_line(void);
 202 static void     get_mountlist(void);
 203 static int      get_net(char *, struct netmsk *, int);
 204 static void     getexp_err(struct exportlist *, struct grouplist *, const char *);
 205 static struct grouplist *get_grp(void);
 206 static void     hang_dirp(struct dirlist *, struct grouplist *,
 207                                 struct exportlist *, int);
 208 static void     huphandler(int sig);
 209 static int      makemask(struct sockaddr_storage *ssp, int bitlen);
 210 static void     mntsrv(struct svc_req *, SVCXPRT *);
 211 static void     nextfield(char **, char **);
 212 static void     out_of_mem(void);
 213 static void     parsecred(char *, struct xucred *);
 214 static int      parsesec(char *, struct exportlist *);
 215 static int      put_exlist(struct dirlist *, XDR *, struct dirlist *,
 216                     int *, int);
 217 static void     *sa_rawaddr(struct sockaddr *sa, int *nbytes);
 218 static int      sacmp(struct sockaddr *sa1, struct sockaddr *sa2,
 219                     struct sockaddr *samask);
 220 static int      scan_tree(struct dirlist *, struct sockaddr *);
 221 static void     usage(void);
 222 static int      xdr_dir(XDR *, char *);
 223 static int      xdr_explist(XDR *, caddr_t);
 224 static int      xdr_explist_brief(XDR *, caddr_t);
 225 static int      xdr_explist_common(XDR *, caddr_t, int);
 226 static int      xdr_fhs(XDR *, caddr_t);
 227 static int      xdr_mlist(XDR *, caddr_t);
 228 static void     terminate(int);
 229
 230 static SLIST_HEAD(, exportlist) exphead = SLIST_HEAD_INITIALIZER(exphead);
 231 static SLIST_HEAD(, mountlist) mlhead = SLIST_HEAD_INITIALIZER(mlhead);
 232 static struct grouplist *grphead;
 233 static char *exnames_default[2] = { _PATH_EXPORTS, NULL };
 234 static char **exnames;
 235 static char **hosts = NULL;
 236 static struct xucred def_anon = {
 237         XUCRED_VERSION,
 238         (uid_t)65534,
 239         1,
 240         { (gid_t)65533 },
 241         NULL
 242 };
 243 static int force_v2 = 0;
 244 static int resvport_only = 1;
 245 static int nhosts = 0;
 246 static int dir_only = 1;
 247 static int dolog = 0;
 248 static int got_sighup = 0;
 249 static int xcreated = 0;
 250
 251 static char *svcport_str = NULL;
 252 static int mallocd_svcport = 0;
 253 static int *sock_fd;
 254 static int sock_fdcnt;
 255 static int sock_fdpos;
 256 static int suspend_nfsd = 0;
 257
 258 static int opt_flags;
 259 static int have_v6 = 1;
 260
 261 static int v4root_phase = 0;
 262 static char v4root_dirpath[PATH_MAX + 1];
 263 static int has_publicfh = 0;
 264
 265 static struct pidfh *pfh = NULL;
 266 /* Bits for opt_flags above */
 267 #define OP_MAPROOT      0x01
 268 #define OP_MAPALL       0x02
 269 /* 0x4 free */
 270 #define OP_MASK         0x08
 271 #define OP_NET          0x10
 272 #define OP_ALLDIRS      0x40
 273 #define OP_HAVEMASK     0x80    /* A mask was specified or inferred. */
 274 #define OP_QUIET        0x100
 275 #define OP_MASKLEN      0x200
 276 #define OP_SEC          0x400
 277
 278 #ifdef DEBUG
 279 static int debug = 1;
 280 static void     SYSLOG(int, const char *, ...) __printflike(2, 3);
 281 #define syslog SYSLOG
 282 #else
 283 static int debug = 0;
 284 #endif
 285
 286 /*
 287  * Similar to strsep(), but it allows for quoted strings
 288  * and escaped characters.
 289  *
 290  * It returns the string (or NULL, if *stringp is NULL),
 291  * which is a de-quoted version of the string if necessary.
 292  *
 293  * It modifies *stringp in place.
 294  */
 295 static char *
 296 strsep_quote(char **stringp, const char *delim)
 297 {
 298         char *srcptr, *dstptr, *retval;
 299         char quot = 0;
 300
 301         if (stringp == NULL || *stringp == NULL)
 302                 return (NULL);
 303
 304         srcptr = dstptr = retval = *stringp;
 305
 306         while (*srcptr) {
 307                 /*
 308                  * We're looking for several edge cases here.
 309                  * First:  if we're in quote state (quot != 0),
 310                  * then we ignore the delim characters, but otherwise
 311                  * process as normal, unless it is the quote character.
 312                  * Second:  if the current character is a backslash,
 313                  * we take the next character as-is, without checking
 314                  * for delim, quote, or backslash.  Exception:  if the
 315                  * next character is a NUL, that's the end of the string.
 316                  * Third:  if the character is a quote character, we toggle
 317                  * quote state.
 318                  * Otherwise:  check the current character for NUL, or
 319                  * being in delim, and end the string if either is true.
 320                  */
 321                 if (*srcptr == '\\') {
 322                         srcptr++;
 323                         /*
 324                          * The edge case here is if the next character
 325                          * is NUL, we want to stop processing.  But if
 326                          * it's not NUL, then we simply want to copy it.
 327                          */
 328                         if (*srcptr) {
 329                                 *dstptr++ = *srcptr++;
 330                         }
 331                         continue;
 332                 }
 333                 if (quot == 0 && (*srcptr == '\'' || *srcptr == '"')) {
 334                         quot = *srcptr++;
 335                         continue;
 336                 }
 337                 if (quot && *srcptr == quot) {
 338                         /* End of the quoted part */
 339                         quot = 0;
 340                         srcptr++;
 341                         continue;
 342                 }
 343                 if (!quot && strchr(delim, *srcptr))
 344                         break;
 345                 *dstptr++ = *srcptr++;
 346         }
 347
 348         *dstptr = 0; /* Terminate the string */
 349         *stringp = (*srcptr == '\0') ? NULL : srcptr + 1;
 350         return (retval);
 351 }
 352
 353 /*
 354  * Mountd server for NFS mount protocol as described in:
 355  * NFS: Network File System Protocol Specification, RFC1094, Appendix A
 356  * The optional arguments are the exports file name
 357  * default: _PATH_EXPORTS
 358  * and "-n" to allow nonroot mount.
 359  */
 360 int
 361 main(int argc, char **argv)
 362 {
 363         fd_set readfds;
 364         struct netconfig *nconf;
 365         char *endptr, **hosts_bak;
 366         void *nc_handle;
 367         pid_t otherpid;
 368         in_port_t svcport;
 369         int c, k, s;
 370         int maxrec = RPC_MAXDATASIZE;
 371         int attempt_cnt, port_len, port_pos, ret;
 372         char **port_list;
 373
 374         /* Check that another mountd isn't already running. */
 375         pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &otherpid);
 376         if (pfh == NULL) {
 377                 if (errno == EEXIST)
 378                         errx(1, "mountd already running, pid: %d.", otherpid);
 379                 warn("cannot open or create pidfile");
 380         }
 381
 382         s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
 383         if (s < 0)
 384                 have_v6 = 0;
 385         else
 386                 close(s);
 387
 388         while ((c = getopt(argc, argv, "2deh:lnp:rS")) != -1)
 389                 switch (c) {
 390                 case '2':
 391                         force_v2 = 1;
 392                         break;
 393                 case 'e':
 394                         /* now a no-op, since this is the default */
 395                         break;
 396                 case 'n':
 397                         resvport_only = 0;
 398                         break;
 399                 case 'r':
 400                         dir_only = 0;
 401                         break;
 402                 case 'd':
 403                         debug = debug ? 0 : 1;
 404                         break;
 405                 case 'l':
 406                         dolog = 1;
 407                         break;
 408                 case 'p':
 409                         endptr = NULL;
 410                         svcport = (in_port_t)strtoul(optarg, &endptr, 10);
 411                         if (endptr == NULL || *endptr != '\0' ||
 412                             svcport == 0 || svcport >= IPPORT_MAX)
 413                                 usage();
 414                         svcport_str = strdup(optarg);
 415                         break;
 416                 case 'h':
 417                         ++nhosts;
 418                         hosts_bak = hosts;
 419                         hosts_bak = realloc(hosts, nhosts * sizeof(char *));
 420                         if (hosts_bak == NULL) {
 421                                 if (hosts != NULL) {
 422                                         for (k = 0; k < nhosts; k++)
 423                                                 free(hosts[k]);
 424                                         free(hosts);
 425                                         out_of_mem();
 426                                 }
 427                         }
 428                         hosts = hosts_bak;
 429                         hosts[nhosts - 1] = strdup(optarg);
 430                         if (hosts[nhosts - 1] == NULL) {
 431                                 for (k = 0; k < (nhosts - 1); k++)
 432                                         free(hosts[k]);
 433                                 free(hosts);
 434                                 out_of_mem();
 435                         }
 436                         break;
 437                 case 'S':
 438                         suspend_nfsd = 1;
 439                         break;
 440                 default:
 441                         usage();
 442                 }
 443
 444         if (modfind("nfsd") < 0) {
 445                 /* Not present in kernel, try loading it */
 446                 if (kldload("nfsd") < 0 || modfind("nfsd") < 0)
 447                         errx(1, "NFS server is not available");
 448         }
 449
 450         argc -= optind;
 451         argv += optind;
 452         grphead = (struct grouplist *)NULL;
 453         if (argc > 0)
 454                 exnames = argv;
 455         else
 456                 exnames = exnames_default;
 457         openlog("mountd", LOG_PID, LOG_DAEMON);
 458         if (debug)
 459                 warnx("getting export list");
 460         get_exportlist();
 461         if (debug)
 462                 warnx("getting mount list");
 463         get_mountlist();
 464         if (debug)
 465                 warnx("here we go");
 466         if (debug == 0) {
 467                 daemon(0, 0);
 468                 signal(SIGINT, SIG_IGN);
 469                 signal(SIGQUIT, SIG_IGN);
 470         }
 471         signal(SIGHUP, huphandler);
 472         signal(SIGTERM, terminate);
 473         signal(SIGPIPE, SIG_IGN);
 474
 475         pidfile_write(pfh);
 476
 477         rpcb_unset(MOUNTPROG, MOUNTVERS, NULL);
 478         rpcb_unset(MOUNTPROG, MOUNTVERS3, NULL);
 479         rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);
 480
 481         if (!resvport_only) {
 482                 if (sysctlbyname("vfs.nfsd.nfs_privport", NULL, NULL,
 483                     &resvport_only, sizeof(resvport_only)) != 0 &&
 484                     errno != ENOENT) {
 485                         syslog(LOG_ERR, "sysctl: %m");
 486                         exit(1);
 487                 }
 488         }
 489
 490         /*
 491          * If no hosts were specified, add a wildcard entry to bind to
 492          * INADDR_ANY. Otherwise make sure 127.0.0.1 and ::1 are added to the
 493          * list.
 494          */
 495         if (nhosts == 0) {
 496                 hosts = malloc(sizeof(char *));
 497                 if (hosts == NULL)
 498                         out_of_mem();
 499                 hosts[0] = "*";
 500                 nhosts = 1;
 501         } else {
 502                 hosts_bak = hosts;
 503                 if (have_v6) {
 504                         hosts_bak = realloc(hosts, (nhosts + 2) *
 505                             sizeof(char *));
 506                         if (hosts_bak == NULL) {
 507                                 for (k = 0; k < nhosts; k++)
 508                                         free(hosts[k]);
 509                                 free(hosts);
 510                                 out_of_mem();
 511                         } else
 512                                 hosts = hosts_bak;
 513                         nhosts += 2;
 514                         hosts[nhosts - 2] = "::1";
 515                 } else {
 516                         hosts_bak = realloc(hosts, (nhosts + 1) * sizeof(char *));
 517                         if (hosts_bak == NULL) {
 518                                 for (k = 0; k < nhosts; k++)
 519                                         free(hosts[k]);
 520                                 free(hosts);
 521                                 out_of_mem();
 522                         } else {
 523                                 nhosts += 1;
 524                                 hosts = hosts_bak;
 525                         }
 526                 }
 527
 528                 hosts[nhosts - 1] = "127.0.0.1";
 529         }
 530
 531         attempt_cnt = 1;
 532         sock_fdcnt = 0;
 533         sock_fd = NULL;
 534         port_list = NULL;
 535         port_len = 0;
 536         nc_handle = setnetconfig();
 537         while ((nconf = getnetconfig(nc_handle))) {
 538                 if (nconf->nc_flag & NC_VISIBLE) {
 539                         if (have_v6 == 0 && strcmp(nconf->nc_protofmly,
 540                             "inet6") == 0) {
 541                                 /* DO NOTHING */
 542                         } else {
 543                                 ret = create_service(nconf);
 544                                 if (ret == 1)
 545                                         /* Ignore this call */
 546                                         continue;
 547                                 if (ret < 0) {
 548                                         /*
 549                                          * Failed to bind port, so close off
 550                                          * all sockets created and try again
 551                                          * if the port# was dynamically
 552                                          * assigned via bind(2).
 553                                          */
 554                                         clearout_service();
 555                                         if (mallocd_svcport != 0 &&
 556                                             attempt_cnt < GETPORT_MAXTRY) {
 557                                                 free(svcport_str);
 558                                                 svcport_str = NULL;
 559                                                 mallocd_svcport = 0;
 560                                         } else {
 561                                                 errno = EADDRINUSE;
 562                                                 syslog(LOG_ERR,
 563                                                     "bindresvport_sa: %m");
 564                                                 exit(1);
 565                                         }
 566
 567                                         /* Start over at the first service. */
 568                                         free(sock_fd);
 569                                         sock_fdcnt = 0;
 570                                         sock_fd = NULL;
 571                                         nc_handle = setnetconfig();
 572                                         attempt_cnt++;
 573                                 } else if (mallocd_svcport != 0 &&
 574                                     attempt_cnt == GETPORT_MAXTRY) {
 575                                         /*
 576                                          * For the last attempt, allow
 577                                          * different port #s for each nconf
 578                                          * by saving the svcport_str and
 579                                          * setting it back to NULL.
 580                                          */
 581                                         port_list = realloc(port_list,
 582                                             (port_len + 1) * sizeof(char *));
 583                                         if (port_list == NULL)
 584                                                 out_of_mem();
 585                                         port_list[port_len++] = svcport_str;
 586                                         svcport_str = NULL;
 587                                         mallocd_svcport = 0;
 588                                 }
 589                         }
 590                 }
 591         }
 592
 593         /*
 594          * Successfully bound the ports, so call complete_service() to
 595          * do the rest of the setup on the service(s).
 596          */
 597         sock_fdpos = 0;
 598         port_pos = 0;
 599         nc_handle = setnetconfig();
 600         while ((nconf = getnetconfig(nc_handle))) {
 601                 if (nconf->nc_flag & NC_VISIBLE) {
 602                         if (have_v6 == 0 && strcmp(nconf->nc_protofmly,
 603                             "inet6") == 0) {
 604                                 /* DO NOTHING */
 605                         } else if (port_list != NULL) {
 606                                 if (port_pos >= port_len) {
 607                                         syslog(LOG_ERR, "too many port#s");
 608                                         exit(1);
 609                                 }
 610                                 complete_service(nconf, port_list[port_pos++]);
 611                         } else
 612                                 complete_service(nconf, svcport_str);
 613                 }
 614         }
 615         endnetconfig(nc_handle);
 616         free(sock_fd);
 617         if (port_list != NULL) {
 618                 for (port_pos = 0; port_pos < port_len; port_pos++)
 619                         free(port_list[port_pos]);
 620                 free(port_list);
 621         }
 622
 623         if (xcreated == 0) {
 624                 syslog(LOG_ERR, "could not create any services");
 625                 exit(1);
 626         }
 627
 628         /* Expand svc_run() here so that we can call get_exportlist(). */
 629         for (;;) {
 630                 if (got_sighup) {
 631                         get_exportlist();
 632                         got_sighup = 0;
 633                 }
 634                 readfds = svc_fdset;
 635                 switch (select(svc_maxfd + 1, &readfds, NULL, NULL, NULL)) {
 636                 case -1:
 637                         if (errno == EINTR)
 638                                 continue;
 639                         syslog(LOG_ERR, "mountd died: select: %m");
 640                         exit(1);
 641                 case 0:
 642                         continue;
 643                 default:
 644                         svc_getreqset(&readfds);
 645                 }
 646         }
 647 }
 648
 649 /*
 650  * This routine creates and binds sockets on the appropriate
 651  * addresses. It gets called one time for each transport.
 652  * It returns 0 upon success, 1 for ingore the call and -1 to indicate
 653  * bind failed with EADDRINUSE.
 654  * Any file descriptors that have been created are stored in sock_fd and
 655  * the total count of them is maintained in sock_fdcnt.
 656  */
 657 static int
 658 create_service(struct netconfig *nconf)
 659 {
 660         struct addrinfo hints, *res = NULL;
 661         struct sockaddr_in *sin;
 662         struct sockaddr_in6 *sin6;
 663         struct __rpc_sockinfo si;
 664         int aicode;
 665         int fd;
 666         int nhostsbak;
 667         int one = 1;
 668         int r;
 669         u_int32_t host_addr[4];  /* IPv4 or IPv6 */
 670         int mallocd_res;
 671
 672         if ((nconf->nc_semantics != NC_TPI_CLTS) &&
 673             (nconf->nc_semantics != NC_TPI_COTS) &&
 674             (nconf->nc_semantics != NC_TPI_COTS_ORD))
 675                 return (1);     /* not my type */
 676
 677         /*
 678          * XXX - using RPC library internal functions.
 679          */
 680         if (!__rpc_nconf2sockinfo(nconf, &si)) {
 681                 syslog(LOG_ERR, "cannot get information for %s",
 682                     nconf->nc_netid);
 683                 return (1);
 684         }
 685
 686         /* Get mountd's address on this transport */
 687         memset(&hints, 0, sizeof hints);
 688         hints.ai_family = si.si_af;
 689         hints.ai_socktype = si.si_socktype;
 690         hints.ai_protocol = si.si_proto;
 691
 692         /*
 693          * Bind to specific IPs if asked to
 694          */
 695         nhostsbak = nhosts;
 696         while (nhostsbak > 0) {
 697                 --nhostsbak;
 698                 sock_fd = realloc(sock_fd, (sock_fdcnt + 1) * sizeof(int));
 699                 if (sock_fd == NULL)
 700                         out_of_mem();
 701                 sock_fd[sock_fdcnt++] = -1;     /* Set invalid for now. */
 702                 mallocd_res = 0;
 703
 704                 hints.ai_flags = AI_PASSIVE;
 705
 706                 /*
 707                  * XXX - using RPC library internal functions.
 708                  */
 709                 if ((fd = __rpc_nconf2fd(nconf)) < 0) {
 710                         int non_fatal = 0;
 711                         if (errno == EAFNOSUPPORT &&
 712                             nconf->nc_semantics != NC_TPI_CLTS)
 713                                 non_fatal = 1;
 714
 715                         syslog(non_fatal ? LOG_DEBUG : LOG_ERR,
 716                             "cannot create socket for %s", nconf->nc_netid);
 717                         if (non_fatal != 0)
 718                                 continue;
 719                         exit(1);
 720                 }
 721
 722                 switch (hints.ai_family) {
 723                 case AF_INET:
 724                         if (inet_pton(AF_INET, hosts[nhostsbak],
 725                             host_addr) == 1) {
 726                                 hints.ai_flags |= AI_NUMERICHOST;
 727                         } else {
 728                                 /*
 729                                  * Skip if we have an AF_INET6 address.
 730                                  */
 731                                 if (inet_pton(AF_INET6, hosts[nhostsbak],
 732                                     host_addr) == 1) {
 733                                         close(fd);
 734                                         continue;
 735                                 }
 736                         }
 737                         break;
 738                 case AF_INET6:
 739                         if (inet_pton(AF_INET6, hosts[nhostsbak],
 740                             host_addr) == 1) {
 741                                 hints.ai_flags |= AI_NUMERICHOST;
 742                         } else {
 743                                 /*
 744                                  * Skip if we have an AF_INET address.
 745                                  */
 746                                 if (inet_pton(AF_INET, hosts[nhostsbak],
 747                                     host_addr) == 1) {
 748                                         close(fd);
 749                                         continue;
 750                                 }
 751                         }
 752
 753                         /*
 754                          * We're doing host-based access checks here, so don't
 755                          * allow v4-in-v6 to confuse things. The kernel will
 756                          * disable it by default on NFS sockets too.
 757                          */
 758                         if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one,
 759                             sizeof one) < 0) {
 760                                 syslog(LOG_ERR,
 761                                     "can't disable v4-in-v6 on IPv6 socket");
 762                                 exit(1);
 763                         }
 764                         break;
 765                 default:
 766                         break;
 767                 }
 768
 769                 /*
 770                  * If no hosts were specified, just bind to INADDR_ANY
 771                  */
 772                 if (strcmp("*", hosts[nhostsbak]) == 0) {
 773                         if (svcport_str == NULL) {
 774                                 res = malloc(sizeof(struct addrinfo));
 775                                 if (res == NULL)
 776                                         out_of_mem();
 777                                 mallocd_res = 1;
 778                                 res->ai_flags = hints.ai_flags;
 779                                 res->ai_family = hints.ai_family;
 780                                 res->ai_protocol = hints.ai_protocol;
 781                                 switch (res->ai_family) {
 782                                 case AF_INET:
 783                                         sin = malloc(sizeof(struct sockaddr_in));
 784                                         if (sin == NULL)
 785                                                 out_of_mem();
 786                                         sin->sin_family = AF_INET;
 787                                         sin->sin_port = htons(0);
 788                                         sin->sin_addr.s_addr = htonl(INADDR_ANY);
 789                                         res->ai_addr = (struct sockaddr*) sin;
 790                                         res->ai_addrlen = (socklen_t)
 791                                             sizeof(struct sockaddr_in);
 792                                         break;
 793                                 case AF_INET6:
 794                                         sin6 = malloc(sizeof(struct sockaddr_in6));
 795                                         if (sin6 == NULL)
 796                                                 out_of_mem();
 797                                         sin6->sin6_family = AF_INET6;
 798                                         sin6->sin6_port = htons(0);
 799                                         sin6->sin6_addr = in6addr_any;
 800                                         res->ai_addr = (struct sockaddr*) sin6;
 801                                         res->ai_addrlen = (socklen_t)
 802                                             sizeof(struct sockaddr_in6);
 803                                         break;
 804                                 default:
 805                                         syslog(LOG_ERR, "bad addr fam %d",
 806                                             res->ai_family);
 807                                         exit(1);
 808                                 }
 809                         } else {
 810                                 if ((aicode = getaddrinfo(NULL, svcport_str,
 811                                     &hints, &res)) != 0) {
 812                                         syslog(LOG_ERR,
 813                                             "cannot get local address for %s: %s",
 814                                             nconf->nc_netid,
 815                                             gai_strerror(aicode));
 816                                         close(fd);
 817                                         continue;
 818                                 }
 819                         }
 820                 } else {
 821                         if ((aicode = getaddrinfo(hosts[nhostsbak], svcport_str,
 822                             &hints, &res)) != 0) {
 823                                 syslog(LOG_ERR,
 824                                     "cannot get local address for %s: %s",
 825                                     nconf->nc_netid, gai_strerror(aicode));
 826                                 close(fd);
 827                                 continue;
 828                         }
 829                 }
 830
 831                 /* Store the fd. */
 832                 sock_fd[sock_fdcnt - 1] = fd;
 833
 834                 /* Now, attempt the bind. */
 835                 r = bindresvport_sa(fd, res->ai_addr);
 836                 if (r != 0) {
 837                         if (errno == EADDRINUSE && mallocd_svcport != 0) {
 838                                 if (mallocd_res != 0) {
 839                                         free(res->ai_addr);
 840                                         free(res);
 841                                 } else
 842                                         freeaddrinfo(res);
 843                                 return (-1);
 844                         }
 845                         syslog(LOG_ERR, "bindresvport_sa: %m");
 846                         exit(1);
 847                 }
 848
 849                 if (svcport_str == NULL) {
 850                         svcport_str = malloc(NI_MAXSERV * sizeof(char));
 851                         if (svcport_str == NULL)
 852                                 out_of_mem();
 853                         mallocd_svcport = 1;
 854
 855                         if (getnameinfo(res->ai_addr,
 856                             res->ai_addr->sa_len, NULL, NI_MAXHOST,
 857                             svcport_str, NI_MAXSERV * sizeof(char),
 858                             NI_NUMERICHOST | NI_NUMERICSERV))
 859                                 errx(1, "Cannot get port number");
 860                 }
 861                 if (mallocd_res != 0) {
 862                         free(res->ai_addr);
 863                         free(res);
 864                 } else
 865                         freeaddrinfo(res);
 866                 res = NULL;
 867         }
 868         return (0);
 869 }
 870
 871 /*
 872  * Called after all the create_service() calls have succeeded, to complete
 873  * the setup and registration.
 874  */
 875 static void
 876 complete_service(struct netconfig *nconf, char *port_str)
 877 {
 878         struct addrinfo hints, *res = NULL;
 879         struct __rpc_sockinfo si;
 880         struct netbuf servaddr;
 881         SVCXPRT *transp = NULL;
 882         int aicode, fd, nhostsbak;
 883         int registered = 0;
 884
 885         if ((nconf->nc_semantics != NC_TPI_CLTS) &&
 886             (nconf->nc_semantics != NC_TPI_COTS) &&
 887             (nconf->nc_semantics != NC_TPI_COTS_ORD))
 888                 return; /* not my type */
 889
 890         /*
 891          * XXX - using RPC library internal functions.
 892          */
 893         if (!__rpc_nconf2sockinfo(nconf, &si)) {
 894                 syslog(LOG_ERR, "cannot get information for %s",
 895                     nconf->nc_netid);
 896                 return;
 897         }
 898
 899         nhostsbak = nhosts;
 900         while (nhostsbak > 0) {
 901                 --nhostsbak;
 902                 if (sock_fdpos >= sock_fdcnt) {
 903                         /* Should never happen. */
 904                         syslog(LOG_ERR, "Ran out of socket fd's");
 905                         return;
 906                 }
 907                 fd = sock_fd[sock_fdpos++];
 908                 if (fd < 0)
 909                         continue;
 910
 911                 /*
 912                  * Using -1 tells listen(2) to use
 913                  * kern.ipc.soacceptqueue for the backlog.
 914                  */
 915                 if (nconf->nc_semantics != NC_TPI_CLTS)
 916                         listen(fd, -1);
 917
 918                 if (nconf->nc_semantics == NC_TPI_CLTS )
 919                         transp = svc_dg_create(fd, 0, 0);
 920                 else
 921                         transp = svc_vc_create(fd, RPC_MAXDATASIZE,
 922                             RPC_MAXDATASIZE);
 923
 924                 if (transp != (SVCXPRT *) NULL) {
 925                         if (!svc_reg(transp, MOUNTPROG, MOUNTVERS, mntsrv,
 926                             NULL))
 927                                 syslog(LOG_ERR,
 928                                     "can't register %s MOUNTVERS service",
 929                                     nconf->nc_netid);
 930                         if (!force_v2) {
 931                                 if (!svc_reg(transp, MOUNTPROG, MOUNTVERS3,
 932                                     mntsrv, NULL))
 933                                         syslog(LOG_ERR,
 934                                             "can't register %s MOUNTVERS3 service",
 935                                             nconf->nc_netid);
 936                         }
 937                 } else
 938                         syslog(LOG_WARNING, "can't create %s services",
 939                             nconf->nc_netid);
 940
 941                 if (registered == 0) {
 942                         registered = 1;
 943                         memset(&hints, 0, sizeof hints);
 944                         hints.ai_flags = AI_PASSIVE;
 945                         hints.ai_family = si.si_af;
 946                         hints.ai_socktype = si.si_socktype;
 947                         hints.ai_protocol = si.si_proto;
 948
 949                         if ((aicode = getaddrinfo(NULL, port_str, &hints,
 950                             &res)) != 0) {
 951                                 syslog(LOG_ERR, "cannot get local address: %s",
 952                                     gai_strerror(aicode));
 953                                 exit(1);
 954                         }
 955
 956                         servaddr.buf = malloc(res->ai_addrlen);
 957                         memcpy(servaddr.buf, res->ai_addr, res->ai_addrlen);
 958                         servaddr.len = res->ai_addrlen;
 959
 960                         rpcb_set(MOUNTPROG, MOUNTVERS, nconf, &servaddr);
 961                         rpcb_set(MOUNTPROG, MOUNTVERS3, nconf, &servaddr);
 962
 963                         xcreated++;
 964                         freeaddrinfo(res);
 965                 }
 966         } /* end while */
 967 }
 968
 969 /*
 970  * Clear out sockets after a failure to bind one of them, so that the
 971  * cycle of socket creation/binding can start anew.
 972  */
 973 static void
 974 clearout_service(void)
 975 {
 976         int i;
 977
 978         for (i = 0; i < sock_fdcnt; i++) {
 979                 if (sock_fd[i] >= 0) {
 980                         shutdown(sock_fd[i], SHUT_RDWR);
 981                         close(sock_fd[i]);
 982                 }
 983         }
 984 }
 985
 986 static void
 987 usage(void)
 988 {
 989         fprintf(stderr,
 990                 "usage: mountd [-2] [-d] [-e] [-l] [-n] [-p <port>] [-r] "
 991                 "[-S] [-h <bindip>] [export_file ...]\n");
 992         exit(1);
 993 }
 994
 995 /*
 996  * The mount rpc service
 997  */
 998 void
 999 mntsrv(struct svc_req *rqstp, SVCXPRT *transp)
1000 {
1001         struct exportlist *ep;
1002         struct dirlist *dp;
1003         struct fhreturn fhr;
1004         struct stat stb;
1005         struct statfs fsb;
1006         char host[NI_MAXHOST], numerichost[NI_MAXHOST];
1007         int lookup_failed = 1;
1008         struct sockaddr *saddr;
1009         u_short sport;
1010         char rpcpath[MNTPATHLEN + 1], dirpath[MAXPATHLEN];
1011         int bad = 0, defset, hostset;
1012         sigset_t sighup_mask;
1013         int numsecflavors, *secflavorsp;
1014
1015         sigemptyset(&sighup_mask);
1016         sigaddset(&sighup_mask, SIGHUP);
1017         saddr = svc_getrpccaller(transp)->buf;
1018         switch (saddr->sa_family) {
1019         case AF_INET6:
1020                 sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port);
1021                 break;
1022         case AF_INET:
1023                 sport = ntohs(((struct sockaddr_in *)saddr)->sin_port);
1024                 break;
1025         default:
1026                 syslog(LOG_ERR, "request from unknown address family");
1027                 return;
1028         }
1029         switch (rqstp->rq_proc) {
1030         case MOUNTPROC_MNT:
1031         case MOUNTPROC_UMNT:
1032         case MOUNTPROC_UMNTALL:
1033                 lookup_failed = getnameinfo(saddr, saddr->sa_len, host,
1034                     sizeof host, NULL, 0, 0);
1035         }
1036         getnameinfo(saddr, saddr->sa_len, numerichost,
1037             sizeof numerichost, NULL, 0, NI_NUMERICHOST);
1038         switch (rqstp->rq_proc) {
1039         case NULLPROC:
1040                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
1041                         syslog(LOG_ERR, "can't send reply");
1042                 return;
1043         case MOUNTPROC_MNT:
1044                 if (sport >= IPPORT_RESERVED && resvport_only) {
1045                         syslog(LOG_NOTICE,
1046                             "mount request from %s from unprivileged port",
1047                             numerichost);
1048                         svcerr_weakauth(transp);
1049                         return;
1050                 }
1051                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
1052                         syslog(LOG_NOTICE, "undecodable mount request from %s",
1053                             numerichost);
1054                         svcerr_decode(transp);
1055                         return;
1056                 }
1057
1058                 /*
1059                  * Get the real pathname and make sure it is a directory
1060                  * or a regular file if the -r option was specified
1061                  * and it exists.
1062                  */
1063                 if (realpath(rpcpath, dirpath) == NULL ||
1064                     stat(dirpath, &stb) < 0 ||
1065                     statfs(dirpath, &fsb) < 0) {
1066                         chdir("/");     /* Just in case realpath doesn't */
1067                         syslog(LOG_NOTICE,
1068                             "mount request from %s for non existent path %s",
1069                             numerichost, dirpath);
1070                         if (debug)
1071                                 warnx("stat failed on %s", dirpath);
1072                         bad = ENOENT;   /* We will send error reply later */
1073                 }
1074                 if (!bad &&
1075                     !S_ISDIR(stb.st_mode) &&
1076                     (dir_only || !S_ISREG(stb.st_mode))) {
1077                         syslog(LOG_NOTICE,
1078                             "mount request from %s for non-directory path %s",
1079                             numerichost, dirpath);
1080                         if (debug)
1081                                 warnx("mounting non-directory %s", dirpath);
1082                         bad = ENOTDIR;  /* We will send error reply later */
1083                 }
1084
1085                 /* Check in the exports list */
1086                 sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
1087                 if (bad)
1088                         ep = NULL;
1089                 else
1090                         ep = ex_search(&fsb.f_fsid);
1091                 hostset = defset = 0;
1092                 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset,
1093                     &numsecflavors, &secflavorsp) ||
1094                     ((dp = dirp_search(ep->ex_dirl, dirpath)) &&
1095                       chk_host(dp, saddr, &defset, &hostset, &numsecflavors,
1096                        &secflavorsp)) ||
1097                     (defset && scan_tree(ep->ex_defdir, saddr) == 0 &&
1098                      scan_tree(ep->ex_dirl, saddr) == 0))) {
1099                         if (bad) {
1100                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
1101                                     (caddr_t)&bad))
1102                                         syslog(LOG_ERR, "can't send reply");
1103                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1104                                 return;
1105                         }
1106                         if (hostset & DP_HOSTSET) {
1107                                 fhr.fhr_flag = hostset;
1108                                 fhr.fhr_numsecflavors = numsecflavors;
1109                                 fhr.fhr_secflavors = secflavorsp;
1110                         } else {
1111                                 fhr.fhr_flag = defset;
1112                                 fhr.fhr_numsecflavors = ep->ex_defnumsecflavors;
1113                                 fhr.fhr_secflavors = ep->ex_defsecflavors;
1114                         }
1115                         fhr.fhr_vers = rqstp->rq_vers;
1116                         /* Get the file handle */
1117                         memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t));
1118                         if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) {
1119                                 bad = errno;
1120                                 syslog(LOG_ERR, "can't get fh for %s", dirpath);
1121                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
1122                                     (caddr_t)&bad))
1123                                         syslog(LOG_ERR, "can't send reply");
1124                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1125                                 return;
1126                         }
1127                         if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs,
1128                             (caddr_t)&fhr))
1129                                 syslog(LOG_ERR, "can't send reply");
1130                         if (!lookup_failed)
1131                                 add_mlist(host, dirpath);
1132                         else
1133                                 add_mlist(numerichost, dirpath);
1134                         if (debug)
1135                                 warnx("mount successful");
1136                         if (dolog)
1137                                 syslog(LOG_NOTICE,
1138                                     "mount request succeeded from %s for %s",
1139                                     numerichost, dirpath);
1140                 } else {
1141                         if (!bad)
1142                                 bad = EACCES;
1143                         syslog(LOG_NOTICE,
1144                             "mount request denied from %s for %s",
1145                             numerichost, dirpath);
1146                 }
1147
1148                 if (bad && !svc_sendreply(transp, (xdrproc_t)xdr_long,
1149                     (caddr_t)&bad))
1150                         syslog(LOG_ERR, "can't send reply");
1151                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1152                 return;
1153         case MOUNTPROC_DUMP:
1154                 if (!svc_sendreply(transp, (xdrproc_t)xdr_mlist, (caddr_t)NULL))
1155                         syslog(LOG_ERR, "can't send reply");
1156                 else if (dolog)
1157                         syslog(LOG_NOTICE,
1158                             "dump request succeeded from %s",
1159                             numerichost);
1160                 return;
1161         case MOUNTPROC_UMNT:
1162                 if (sport >= IPPORT_RESERVED && resvport_only) {
1163                         syslog(LOG_NOTICE,
1164                             "umount request from %s from unprivileged port",
1165                             numerichost);
1166                         svcerr_weakauth(transp);
1167                         return;
1168                 }
1169                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
1170                         syslog(LOG_NOTICE, "undecodable umount request from %s",
1171                             numerichost);
1172                         svcerr_decode(transp);
1173                         return;
1174                 }
1175                 if (realpath(rpcpath, dirpath) == NULL) {
1176                         syslog(LOG_NOTICE, "umount request from %s "
1177                             "for non existent path %s",
1178                             numerichost, dirpath);
1179                 }
1180                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL))
1181                         syslog(LOG_ERR, "can't send reply");
1182                 if (!lookup_failed)
1183                         del_mlist(host, dirpath);
1184                 del_mlist(numerichost, dirpath);
1185                 if (dolog)
1186                         syslog(LOG_NOTICE,
1187                             "umount request succeeded from %s for %s",
1188                             numerichost, dirpath);
1189                 return;
1190         case MOUNTPROC_UMNTALL:
1191                 if (sport >= IPPORT_RESERVED && resvport_only) {
1192                         syslog(LOG_NOTICE,
1193                             "umountall request from %s from unprivileged port",
1194                             numerichost);
1195                         svcerr_weakauth(transp);
1196                         return;
1197                 }
1198                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL))
1199                         syslog(LOG_ERR, "can't send reply");
1200                 if (!lookup_failed)
1201                         del_mlist(host, NULL);
1202                 del_mlist(numerichost, NULL);
1203                 if (dolog)
1204                         syslog(LOG_NOTICE,
1205                             "umountall request succeeded from %s",
1206                             numerichost);
1207                 return;
1208         case MOUNTPROC_EXPORT:
1209                 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, (caddr_t)NULL))
1210                         if (!svc_sendreply(transp, (xdrproc_t)xdr_explist_brief,
1211                             (caddr_t)NULL))
1212                                 syslog(LOG_ERR, "can't send reply");
1213                 if (dolog)
1214                         syslog(LOG_NOTICE,
1215                             "export request succeeded from %s",
1216                             numerichost);
1217                 return;
1218         default:
1219                 svcerr_noproc(transp);
1220                 return;
1221         }
1222 }
1223
1224 /*
1225  * Xdr conversion for a dirpath string
1226  */
1227 static int
1228 xdr_dir(XDR *xdrsp, char *dirp)
1229 {
1230         return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
1231 }
1232
1233 /*
1234  * Xdr routine to generate file handle reply
1235  */
1236 static int
1237 xdr_fhs(XDR *xdrsp, caddr_t cp)
1238 {
1239         struct fhreturn *fhrp = (struct fhreturn *)cp;
1240         u_long ok = 0, len, auth;
1241         int i;
1242
1243         if (!xdr_long(xdrsp, &ok))
1244                 return (0);
1245         switch (fhrp->fhr_vers) {
1246         case 1:
1247                 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH));
1248         case 3:
1249                 len = NFSX_V3FH;
1250                 if (!xdr_long(xdrsp, &len))
1251                         return (0);
1252                 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len))
1253                         return (0);
1254                 if (fhrp->fhr_numsecflavors) {
1255                         if (!xdr_int(xdrsp, &fhrp->fhr_numsecflavors))
1256                                 return (0);
1257                         for (i = 0; i < fhrp->fhr_numsecflavors; i++)
1258                                 if (!xdr_int(xdrsp, &fhrp->fhr_secflavors[i]))
1259                                         return (0);
1260                         return (1);
1261                 } else {
1262                         auth = AUTH_SYS;
1263                         len = 1;
1264                         if (!xdr_long(xdrsp, &len))
1265                                 return (0);
1266                         return (xdr_long(xdrsp, &auth));
1267                 }
1268         }
1269         return (0);
1270 }
1271
1272 static int
1273 xdr_mlist(XDR *xdrsp, caddr_t cp __unused)
1274 {
1275         struct mountlist *mlp;
1276         int true = 1;
1277         int false = 0;
1278         char *strp;
1279
1280         SLIST_FOREACH(mlp, &mlhead, next) {
1281                 if (!xdr_bool(xdrsp, &true))
1282                         return (0);
1283                 strp = &mlp->ml_host[0];
1284                 if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
1285                         return (0);
1286                 strp = &mlp->ml_dirp[0];
1287                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1288                         return (0);
1289         }
1290         if (!xdr_bool(xdrsp, &false))
1291                 return (0);
1292         return (1);
1293 }
1294
1295 /*
1296  * Xdr conversion for export list
1297  */
1298 static int
1299 xdr_explist_common(XDR *xdrsp, caddr_t cp __unused, int brief)
1300 {
1301         struct exportlist *ep;
1302         int false = 0;
1303         int putdef;
1304         sigset_t sighup_mask;
1305
1306         sigemptyset(&sighup_mask);
1307         sigaddset(&sighup_mask, SIGHUP);
1308         sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
1309
1310         SLIST_FOREACH(ep, &exphead, entries) {
1311                 putdef = 0;
1312                 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir,
1313                                &putdef, brief))
1314                         goto errout;
1315                 if (ep->ex_defdir && putdef == 0 &&
1316                         put_exlist(ep->ex_defdir, xdrsp, (struct dirlist *)NULL,
1317                         &putdef, brief))
1318                         goto errout;
1319         }
1320         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1321         if (!xdr_bool(xdrsp, &false))
1322                 return (0);
1323         return (1);
1324 errout:
1325         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1326         return (0);
1327 }
1328
1329 /*
1330  * Called from xdr_explist() to traverse the tree and export the
1331  * directory paths.
1332  */
1333 static int
1334 put_exlist(struct dirlist *dp, XDR *xdrsp, struct dirlist *adp, int *putdefp,
1335         int brief)
1336 {
1337         struct grouplist *grp;
1338         struct hostlist *hp;
1339         int true = 1;
1340         int false = 0;
1341         int gotalldir = 0;
1342         char *strp;
1343
1344         if (dp) {
1345                 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp, brief))
1346                         return (1);
1347                 if (!xdr_bool(xdrsp, &true))
1348                         return (1);
1349                 strp = dp->dp_dirp;
1350                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1351                         return (1);
1352                 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) {
1353                         gotalldir = 1;
1354                         *putdefp = 1;
1355                 }
1356                 if (brief) {
1357                         if (!xdr_bool(xdrsp, &true))
1358                                 return (1);
1359                         strp = "(...)";
1360                         if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1361                                 return (1);
1362                 } else if ((dp->dp_flag & DP_DEFSET) == 0 &&
1363                     (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) {
1364                         hp = dp->dp_hosts;
1365                         while (hp) {
1366                                 grp = hp->ht_grp;
1367                                 if (grp->gr_type == GT_HOST) {
1368                                         if (!xdr_bool(xdrsp, &true))
1369                                                 return (1);
1370                                         strp = grp->gr_ptr.gt_addrinfo->ai_canonname;
1371                                         if (!xdr_string(xdrsp, &strp,
1372                                             MNTNAMLEN))
1373                                                 return (1);
1374                                 } else if (grp->gr_type == GT_NET) {
1375                                         if (!xdr_bool(xdrsp, &true))
1376                                                 return (1);
1377                                         strp = grp->gr_ptr.gt_net.nt_name;
1378                                         if (!xdr_string(xdrsp, &strp,
1379                                             MNTNAMLEN))
1380                                                 return (1);
1381                                 }
1382                                 hp = hp->ht_next;
1383                                 if (gotalldir && hp == (struct hostlist *)NULL) {
1384                                         hp = adp->dp_hosts;
1385                                         gotalldir = 0;
1386                                 }
1387                         }
1388                 }
1389                 if (!xdr_bool(xdrsp, &false))
1390                         return (1);
1391                 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp, brief))
1392                         return (1);
1393         }
1394         return (0);
1395 }
1396
1397 static int
1398 xdr_explist(XDR *xdrsp, caddr_t cp)
1399 {
1400
1401         return xdr_explist_common(xdrsp, cp, 0);
1402 }
1403
1404 static int
1405 xdr_explist_brief(XDR *xdrsp, caddr_t cp)
1406 {
1407
1408         return xdr_explist_common(xdrsp, cp, 1);
1409 }
1410
1411 static char *line;
1412 static size_t linesize;
1413 static FILE *exp_file;
1414
1415 /*
1416  * Get the export list from one, currently open file
1417  */
1418 static void
1419 get_exportlist_one(void)
1420 {
1421         struct exportlist *ep;
1422         struct grouplist *grp, *tgrp;
1423         struct dirlist *dirhead;
1424         struct statfs fsb;
1425         struct xucred anon;
1426         char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc;
1427         int len, has_host, exflags, got_nondir, dirplen, netgrp;
1428
1429         v4root_phase = 0;
1430         dirhead = (struct dirlist *)NULL;
1431         while (get_line()) {
1432                 if (debug)
1433                         warnx("got line %s", line);
1434                 cp = line;
1435                 nextfield(&cp, &endcp);
1436                 if (*cp == '#')
1437                         goto nextline;
1438
1439                 /*
1440                  * Set defaults.
1441                  */
1442                 has_host = FALSE;
1443                 anon = def_anon;
1444                 exflags = MNT_EXPORTED;
1445                 got_nondir = 0;
1446                 opt_flags = 0;
1447                 ep = (struct exportlist *)NULL;
1448                 dirp = NULL;
1449
1450                 /*
1451                  * Handle the V4 root dir.
1452                  */
1453                 if (*cp == 'V' && *(cp + 1) == '4' && *(cp + 2) == ':') {
1454                         /*
1455                          * V4: just indicates that it is the v4 root point,
1456                          * so skip over that and set v4root_phase.
1457                          */
1458                         if (v4root_phase > 0) {
1459                                 syslog(LOG_ERR, "V4:duplicate line, ignored");
1460                                 goto nextline;
1461                         }
1462                         v4root_phase = 1;
1463                         cp += 3;
1464                         nextfield(&cp, &endcp);
1465                 }
1466
1467                 /*
1468                  * Create new exports list entry
1469                  */
1470                 len = endcp-cp;
1471                 tgrp = grp = get_grp();
1472                 while (len > 0) {
1473                         if (len > MNTNAMLEN) {
1474                             getexp_err(ep, tgrp, "mountpoint too long");
1475                             goto nextline;
1476                         }
1477                         if (*cp == '-') {
1478                             if (ep == (struct exportlist *)NULL) {
1479                                 getexp_err(ep, tgrp,
1480                                     "flag before export path definition");
1481                                 goto nextline;
1482                             }
1483                             if (debug)
1484                                 warnx("doing opt %s", cp);
1485                             got_nondir = 1;
1486                             if (do_opt(&cp, &endcp, ep, grp, &has_host,
1487                                 &exflags, &anon)) {
1488                                 getexp_err(ep, tgrp, NULL);
1489                                 goto nextline;
1490                             }
1491                         } else if (*cp == '/') {
1492                             savedc = *endcp;
1493                             *endcp = '\0';
1494                             if (v4root_phase > 1) {
1495                                     if (dirp != NULL) {
1496                                         getexp_err(ep, tgrp, "Multiple V4 dirs");
1497                                         goto nextline;
1498                                     }
1499                             }
1500                             if (check_dirpath(cp) &&
1501                                 statfs(cp, &fsb) >= 0) {
1502                                 if ((fsb.f_flags & MNT_AUTOMOUNTED) != 0)
1503                                     syslog(LOG_ERR, "Warning: exporting of "
1504                                         "automounted fs %s not supported", cp);
1505                                 if (got_nondir) {
1506                                     getexp_err(ep, tgrp, "dirs must be first");
1507                                     goto nextline;
1508                                 }
1509                                 if (v4root_phase == 1) {
1510                                     if (dirp != NULL) {
1511                                         getexp_err(ep, tgrp, "Multiple V4 dirs");
1512                                         goto nextline;
1513                                     }
1514                                     if (strlen(v4root_dirpath) == 0) {
1515                                         strlcpy(v4root_dirpath, cp,
1516                                             sizeof (v4root_dirpath));
1517                                     } else if (strcmp(v4root_dirpath, cp)
1518                                         != 0) {
1519                                         syslog(LOG_ERR,
1520                                             "different V4 dirpath %s", cp);
1521                                         getexp_err(ep, tgrp, NULL);
1522                                         goto nextline;
1523                                     }
1524                                     dirp = cp;
1525                                     v4root_phase = 2;
1526                                     got_nondir = 1;
1527                                     ep = get_exp();
1528                                 } else {
1529                                     if (ep) {
1530                                         if (ep->ex_fs.val[0] !=
1531                                             fsb.f_fsid.val[0] ||
1532                                             ep->ex_fs.val[1] !=
1533                                             fsb.f_fsid.val[1]) {
1534                                                 getexp_err(ep, tgrp,
1535                                                     "fsid mismatch");
1536                                                 goto nextline;
1537                                         }
1538                                     } else {
1539                                         /*
1540                                          * See if this directory is already
1541                                          * in the list.
1542                                          */
1543                                         ep = ex_search(&fsb.f_fsid);
1544                                         if (ep == (struct exportlist *)NULL) {
1545                                             ep = get_exp();
1546                                             ep->ex_fs = fsb.f_fsid;
1547                                             ep->ex_fsdir = strdup(fsb.f_mntonname);
1548                                             if (ep->ex_fsdir == NULL)
1549                                                 out_of_mem();
1550                                             if (debug)
1551                                                 warnx(
1552                                                   "making new ep fs=0x%x,0x%x",
1553                                                   fsb.f_fsid.val[0],
1554                                                   fsb.f_fsid.val[1]);
1555                                         } else if (debug)
1556                                             warnx("found ep fs=0x%x,0x%x",
1557                                                 fsb.f_fsid.val[0],
1558                                                 fsb.f_fsid.val[1]);
1559                                     }
1560
1561                                     /*
1562                                      * Add dirpath to export mount point.
1563                                      */
1564                                     dirp = add_expdir(&dirhead, cp, len);
1565                                     dirplen = len;
1566                                 }
1567                             } else {
1568                                 getexp_err(ep, tgrp,
1569                                     "symbolic link in export path or statfs failed");
1570                                 goto nextline;
1571                             }
1572                             *endcp = savedc;
1573                         } else {
1574                             savedc = *endcp;
1575                             *endcp = '\0';
1576                             got_nondir = 1;
1577                             if (ep == (struct exportlist *)NULL) {
1578                                 getexp_err(ep, tgrp,
1579                                     "host(s) before export path definition");
1580                                 goto nextline;
1581                             }
1582
1583                             /*
1584                              * Get the host or netgroup.
1585                              */
1586                             setnetgrent(cp);
1587                             netgrp = getnetgrent(&hst, &usr, &dom);
1588                             do {
1589                                 if (has_host) {
1590                                     grp->gr_next = get_grp();
1591                                     grp = grp->gr_next;
1592                                 }
1593                                 if (netgrp) {
1594                                     if (hst == 0) {
1595                                         syslog(LOG_ERR,
1596                                 "null hostname in netgroup %s, skipping", cp);
1597                                         grp->gr_type = GT_IGNORE;
1598                                     } else if (get_host(hst, grp, tgrp)) {
1599                                         syslog(LOG_ERR,
1600                         "bad host %s in netgroup %s, skipping", hst, cp);
1601                                         grp->gr_type = GT_IGNORE;
1602                                     }
1603                                 } else if (get_host(cp, grp, tgrp)) {
1604                                     syslog(LOG_ERR, "bad host %s, skipping", cp);
1605                                     grp->gr_type = GT_IGNORE;
1606                                 }
1607                                 has_host = TRUE;
1608                             } while (netgrp && getnetgrent(&hst, &usr, &dom));
1609                             endnetgrent();
1610                             *endcp = savedc;
1611                         }
1612                         cp = endcp;
1613                         nextfield(&cp, &endcp);
1614                         len = endcp - cp;
1615                 }
1616                 if (check_options(dirhead)) {
1617                         getexp_err(ep, tgrp, NULL);
1618                         goto nextline;
1619                 }
1620                 if (!has_host) {
1621                         grp->gr_type = GT_DEFAULT;
1622                         if (debug)
1623                                 warnx("adding a default entry");
1624
1625                 /*
1626                  * Don't allow a network export coincide with a list of
1627                  * host(s) on the same line.
1628                  */
1629                 } else if ((opt_flags & OP_NET) && tgrp->gr_next) {
1630                         getexp_err(ep, tgrp, "network/host conflict");
1631                         goto nextline;
1632
1633                 /*
1634                  * If an export list was specified on this line, make sure
1635                  * that we have at least one valid entry, otherwise skip it.
1636                  */
1637                 } else {
1638                         grp = tgrp;
1639                         while (grp && grp->gr_type == GT_IGNORE)
1640                                 grp = grp->gr_next;
1641                         if (! grp) {
1642                             getexp_err(ep, tgrp, "no valid entries");
1643                             goto nextline;
1644                         }
1645                 }
1646
1647                 if (v4root_phase == 1) {
1648                         getexp_err(ep, tgrp, "V4:root, no dirp, ignored");
1649                         goto nextline;
1650                 }
1651
1652                 /*
1653                  * Loop through hosts, pushing the exports into the kernel.
1654                  * After loop, tgrp points to the start of the list and
1655                  * grp points to the last entry in the list.
1656                  */
1657                 grp = tgrp;
1658                 do {
1659                         if (do_mount(ep, grp, exflags, &anon, dirp, dirplen,
1660                             &fsb)) {
1661                                 getexp_err(ep, tgrp, NULL);
1662                                 goto nextline;
1663                         }
1664                 } while (grp->gr_next && (grp = grp->gr_next));
1665
1666                 /*
1667                  * For V4: don't enter in mount lists.
1668                  */
1669                 if (v4root_phase > 0 && v4root_phase <= 2) {
1670                         /*
1671                          * Since these structures aren't used by mountd,
1672                          * free them up now.
1673                          */
1674                         if (ep != NULL)
1675                                 free_exp(ep);
1676                         while (tgrp != NULL) {
1677                                 grp = tgrp;
1678                                 tgrp = tgrp->gr_next;
1679                                 free_grp(grp);
1680                         }
1681                         goto nextline;
1682                 }
1683
1684                 /*
1685                  * Success. Update the data structures.
1686                  */
1687                 if (has_host) {
1688                         hang_dirp(dirhead, tgrp, ep, opt_flags);
1689                         grp->gr_next = grphead;
1690                         grphead = tgrp;
1691                 } else {
1692                         hang_dirp(dirhead, (struct grouplist *)NULL, ep,
1693                                 opt_flags);
1694                         free_grp(grp);
1695                 }
1696                 dirhead = (struct dirlist *)NULL;
1697                 if ((ep->ex_flag & EX_LINKED) == 0) {
1698                         SLIST_INSERT_HEAD(&exphead, ep, entries);
1699
1700                         ep->ex_flag |= EX_LINKED;
1701                 }
1702 nextline:
1703                 v4root_phase = 0;
1704                 if (dirhead) {
1705                         free_dir(dirhead);
1706                         dirhead = (struct dirlist *)NULL;
1707                 }
1708         }
1709 }
1710
1711 /*
1712  * Get the export list from all specified files
1713  */
1714 static void
1715 get_exportlist(void)
1716 {
1717         struct exportlist *ep, *ep2;
1718         struct grouplist *grp, *tgrp;
1719         struct export_args export;
1720         struct iovec *iov;
1721         struct statfs *fsp, *mntbufp;
1722         struct xvfsconf vfc;
1723         char errmsg[255];
1724         int num, i;
1725         int iovlen;
1726         int done;
1727         struct nfsex_args eargs;
1728
1729         if (suspend_nfsd != 0)
1730                 (void)nfssvc(NFSSVC_SUSPENDNFSD, NULL);
1731         v4root_dirpath[0] = '\0';
1732         bzero(&export, sizeof(export));
1733         export.ex_flags = MNT_DELEXPORT;
1734         iov = NULL;
1735         iovlen = 0;
1736         bzero(errmsg, sizeof(errmsg));
1737
1738         /*
1739          * First, get rid of the old list
1740          */
1741         SLIST_FOREACH_SAFE(ep, &exphead, entries, ep2) {
1742                 SLIST_REMOVE(&exphead, ep, exportlist, entries);
1743                 free_exp(ep);
1744         }
1745
1746         grp = grphead;
1747         while (grp) {
1748                 tgrp = grp;
1749                 grp = grp->gr_next;
1750                 free_grp(tgrp);
1751         }
1752         grphead = (struct grouplist *)NULL;
1753
1754         /*
1755          * and the old V4 root dir.
1756          */
1757         bzero(&eargs, sizeof (eargs));
1758         eargs.export.ex_flags = MNT_DELEXPORT;
1759         if (nfssvc(NFSSVC_V4ROOTEXPORT, (caddr_t)&eargs) < 0 &&
1760             errno != ENOENT)
1761                 syslog(LOG_ERR, "Can't delete exports for V4:");
1762
1763         /*
1764          * and clear flag that notes if a public fh has been exported.
1765          */
1766         has_publicfh = 0;
1767
1768         /*
1769          * And delete exports that are in the kernel for all local
1770          * filesystems.
1771          * XXX: Should know how to handle all local exportable filesystems.
1772          */
1773         num = getmntinfo(&mntbufp, MNT_NOWAIT);
1774
1775         if (num > 0) {
1776                 build_iovec(&iov, &iovlen, "fstype", NULL, 0);
1777                 build_iovec(&iov, &iovlen, "fspath", NULL, 0);
1778                 build_iovec(&iov, &iovlen, "from", NULL, 0);
1779                 build_iovec(&iov, &iovlen, "update", NULL, 0);
1780                 build_iovec(&iov, &iovlen, "export", &export, sizeof(export));
1781                 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
1782         }
1783
1784         for (i = 0; i < num; i++) {
1785                 fsp = &mntbufp[i];
1786                 if (getvfsbyname(fsp->f_fstypename, &vfc) != 0) {
1787                         syslog(LOG_ERR, "getvfsbyname() failed for %s",
1788                             fsp->f_fstypename);
1789                         continue;
1790                 }
1791
1792                 /*
1793                  * We do not need to delete "export" flag from
1794                  * filesystems that do not have it set.
1795                  */
1796                 if (!(fsp->f_flags & MNT_EXPORTED))
1797                     continue;
1798                 /*
1799                  * Do not delete export for network filesystem by
1800                  * passing "export" arg to nmount().
1801                  * It only makes sense to do this for local filesystems.
1802                  */
1803                 if (vfc.vfc_flags & VFCF_NETWORK)
1804                         continue;
1805
1806                 iov[1].iov_base = fsp->f_fstypename;
1807                 iov[1].iov_len = strlen(fsp->f_fstypename) + 1;
1808                 iov[3].iov_base = fsp->f_mntonname;
1809                 iov[3].iov_len = strlen(fsp->f_mntonname) + 1;
1810                 iov[5].iov_base = fsp->f_mntfromname;
1811                 iov[5].iov_len = strlen(fsp->f_mntfromname) + 1;
1812                 errmsg[0] = '\0';
1813
1814                 /*
1815                  * EXDEV is returned when path exists but is not a
1816                  * mount point.  May happens if raced with unmount.
1817                  */
1818                 if (nmount(iov, iovlen, fsp->f_flags) < 0 &&
1819                     errno != ENOENT && errno != ENOTSUP && errno != EXDEV) {
1820                         syslog(LOG_ERR,
1821                             "can't delete exports for %s: %m %s",
1822                             fsp->f_mntonname, errmsg);
1823                 }
1824         }
1825
1826         if (iov != NULL) {
1827                 /* Free strings allocated by strdup() in getmntopts.c */
1828                 free(iov[0].iov_base); /* fstype */
1829                 free(iov[2].iov_base); /* fspath */
1830                 free(iov[4].iov_base); /* from */
1831                 free(iov[6].iov_base); /* update */
1832                 free(iov[8].iov_base); /* export */
1833                 free(iov[10].iov_base); /* errmsg */
1834
1835                 /* free iov, allocated by realloc() */
1836                 free(iov);
1837                 iovlen = 0;
1838         }
1839
1840         /*
1841          * Read in the exports file and build the list, calling
1842          * nmount() as we go along to push the export rules into the kernel.
1843          */
1844         done = 0;
1845         for (i = 0; exnames[i] != NULL; i++) {
1846                 if (debug)
1847                         warnx("reading exports from %s", exnames[i]);
1848                 if ((exp_file = fopen(exnames[i], "r")) == NULL) {
1849                         syslog(LOG_WARNING, "can't open %s", exnames[i]);
1850                         continue;
1851                 }
1852                 get_exportlist_one();
1853                 fclose(exp_file);
1854                 done++;
1855         }
1856         if (done == 0) {
1857                 syslog(LOG_ERR, "can't open any exports file");
1858                 exit(2);
1859         }
1860
1861         /*
1862          * If there was no public fh, clear any previous one set.
1863          */
1864         if (has_publicfh == 0)
1865                 (void) nfssvc(NFSSVC_NOPUBLICFH, NULL);
1866
1867         /* Resume the nfsd. If they weren't suspended, this is harmless. */
1868         (void)nfssvc(NFSSVC_RESUMENFSD, NULL);
1869 }
1870
1871 /*
1872  * Allocate an export list element
1873  */
1874 static struct exportlist *
1875 get_exp(void)
1876 {
1877         struct exportlist *ep;
1878
1879         ep = (struct exportlist *)calloc(1, sizeof (struct exportlist));
1880         if (ep == (struct exportlist *)NULL)
1881                 out_of_mem();
1882         return (ep);
1883 }
1884
1885 /*
1886  * Allocate a group list element
1887  */
1888 static struct grouplist *
1889 get_grp(void)
1890 {
1891         struct grouplist *gp;
1892
1893         gp = (struct grouplist *)calloc(1, sizeof (struct grouplist));
1894         if (gp == (struct grouplist *)NULL)
1895                 out_of_mem();
1896         return (gp);
1897 }
1898
1899 /*
1900  * Clean up upon an error in get_exportlist().
1901  */
1902 static void
1903 getexp_err(struct exportlist *ep, struct grouplist *grp, const char *reason)
1904 {
1905         struct grouplist *tgrp;
1906
1907         if (!(opt_flags & OP_QUIET)) {
1908                 if (reason != NULL)
1909                         syslog(LOG_ERR, "bad exports list line '%s': %s", line,
1910                             reason);
1911                 else
1912                         syslog(LOG_ERR, "bad exports list line '%s'", line);
1913         }
1914         if (ep && (ep->ex_flag & EX_LINKED) == 0)
1915                 free_exp(ep);
1916         while (grp) {
1917                 tgrp = grp;
1918                 grp = grp->gr_next;
1919                 free_grp(tgrp);
1920         }
1921 }
1922
1923 /*
1924  * Search the export list for a matching fs.
1925  */
1926 static struct exportlist *
1927 ex_search(fsid_t *fsid)
1928 {
1929         struct exportlist *ep;
1930
1931         SLIST_FOREACH(ep, &exphead, entries) {
1932                 if (ep->ex_fs.val[0] == fsid->val[0] &&
1933                     ep->ex_fs.val[1] == fsid->val[1])
1934                         return (ep);
1935         }
1936
1937         return (ep);
1938 }
1939
1940 /*
1941  * Add a directory path to the list.
1942  */
1943 static char *
1944 add_expdir(struct dirlist **dpp, char *cp, int len)
1945 {
1946         struct dirlist *dp;
1947
1948         dp = malloc(sizeof (struct dirlist));
1949         if (dp == (struct dirlist *)NULL)
1950                 out_of_mem();
1951         dp->dp_left = *dpp;
1952         dp->dp_right = (struct dirlist *)NULL;
1953         dp->dp_flag = 0;
1954         dp->dp_hosts = (struct hostlist *)NULL;
1955         dp->dp_dirp = strndup(cp, len);
1956         if (dp->dp_dirp == NULL)
1957                 out_of_mem();
1958         *dpp = dp;
1959         return (dp->dp_dirp);
1960 }
1961
1962 /*
1963  * Hang the dir list element off the dirpath binary tree as required
1964  * and update the entry for host.
1965  */
1966 static void
1967 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep,
1968         int flags)
1969 {
1970         struct hostlist *hp;
1971         struct dirlist *dp2;
1972
1973         if (flags & OP_ALLDIRS) {
1974                 if (ep->ex_defdir)
1975                         free((caddr_t)dp);
1976                 else
1977                         ep->ex_defdir = dp;
1978                 if (grp == (struct grouplist *)NULL) {
1979                         ep->ex_defdir->dp_flag |= DP_DEFSET;
1980                         /* Save the default security flavors list. */
1981                         ep->ex_defnumsecflavors = ep->ex_numsecflavors;
1982                         if (ep->ex_numsecflavors > 0)
1983                                 memcpy(ep->ex_defsecflavors, ep->ex_secflavors,
1984                                     sizeof(ep->ex_secflavors));
1985                 } else while (grp) {
1986                         hp = get_ht();
1987                         hp->ht_grp = grp;
1988                         hp->ht_next = ep->ex_defdir->dp_hosts;
1989                         ep->ex_defdir->dp_hosts = hp;
1990                         /* Save the security flavors list for this host set. */
1991                         grp->gr_numsecflavors = ep->ex_numsecflavors;
1992                         if (ep->ex_numsecflavors > 0)
1993                                 memcpy(grp->gr_secflavors, ep->ex_secflavors,
1994                                     sizeof(ep->ex_secflavors));
1995                         grp = grp->gr_next;
1996                 }
1997         } else {
1998
1999                 /*
2000                  * Loop through the directories adding them to the tree.
2001                  */
2002                 while (dp) {
2003                         dp2 = dp->dp_left;
2004                         add_dlist(&ep->ex_dirl, dp, grp, flags, ep);
2005                         dp = dp2;
2006                 }
2007         }
2008 }
2009
2010 /*
2011  * Traverse the binary tree either updating a node that is already there
2012  * for the new directory or adding the new node.
2013  */
2014 static void
2015 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp,
2016         int flags, struct exportlist *ep)
2017 {
2018         struct dirlist *dp;
2019         struct hostlist *hp;
2020         int cmp;
2021
2022         dp = *dpp;
2023         if (dp) {
2024                 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp);
2025                 if (cmp > 0) {
2026                         add_dlist(&dp->dp_left, newdp, grp, flags, ep);
2027                         return;
2028                 } else if (cmp < 0) {
2029                         add_dlist(&dp->dp_right, newdp, grp, flags, ep);
2030                         return;
2031                 } else
2032                         free((caddr_t)newdp);
2033         } else {
2034                 dp = newdp;
2035                 dp->dp_left = (struct dirlist *)NULL;
2036                 *dpp = dp;
2037         }
2038         if (grp) {
2039
2040                 /*
2041                  * Hang all of the host(s) off of the directory point.
2042                  */
2043                 do {
2044                         hp = get_ht();
2045                         hp->ht_grp = grp;
2046                         hp->ht_next = dp->dp_hosts;
2047                         dp->dp_hosts = hp;
2048                         /* Save the security flavors list for this host set. */
2049                         grp->gr_numsecflavors = ep->ex_numsecflavors;
2050                         if (ep->ex_numsecflavors > 0)
2051                                 memcpy(grp->gr_secflavors, ep->ex_secflavors,
2052                                     sizeof(ep->ex_secflavors));
2053                         grp = grp->gr_next;
2054                 } while (grp);
2055         } else {
2056                 dp->dp_flag |= DP_DEFSET;
2057                 /* Save the default security flavors list. */
2058                 ep->ex_defnumsecflavors = ep->ex_numsecflavors;
2059                 if (ep->ex_numsecflavors > 0)
2060                         memcpy(ep->ex_defsecflavors, ep->ex_secflavors,
2061                             sizeof(ep->ex_secflavors));
2062         }
2063 }
2064
2065 /*
2066  * Search for a dirpath on the export point.
2067  */
2068 static struct dirlist *
2069 dirp_search(struct dirlist *dp, char *dirp)
2070 {
2071         int cmp;
2072
2073         if (dp) {
2074                 cmp = strcmp(dp->dp_dirp, dirp);
2075                 if (cmp > 0)
2076                         return (dirp_search(dp->dp_left, dirp));
2077                 else if (cmp < 0)
2078                         return (dirp_search(dp->dp_right, dirp));
2079                 else
2080                         return (dp);
2081         }
2082         return (dp);
2083 }
2084
2085 /*
2086  * Scan for a host match in a directory tree.
2087  */
2088 static int
2089 chk_host(struct dirlist *dp, struct sockaddr *saddr, int *defsetp,
2090         int *hostsetp, int *numsecflavors, int **secflavorsp)
2091 {
2092         struct hostlist *hp;
2093         struct grouplist *grp;
2094         struct addrinfo *ai;
2095
2096         if (dp) {
2097                 if (dp->dp_flag & DP_DEFSET)
2098                         *defsetp = dp->dp_flag;
2099                 hp = dp->dp_hosts;
2100                 while (hp) {
2101                         grp = hp->ht_grp;
2102                         switch (grp->gr_type) {
2103                         case GT_HOST:
2104                                 ai = grp->gr_ptr.gt_addrinfo;
2105                                 for (; ai; ai = ai->ai_next) {
2106                                         if (!sacmp(ai->ai_addr, saddr, NULL)) {
2107                                                 *hostsetp =
2108                                                     (hp->ht_flag | DP_HOSTSET);
2109                                                 if (numsecflavors != NULL) {
2110                                                         *numsecflavors =
2111                                                             grp->gr_numsecflavors;
2112                                                         *secflavorsp =
2113                                                             grp->gr_secflavors;
2114                                                 }
2115                                                 return (1);
2116                                         }
2117                                 }
2118                                 break;
2119                         case GT_NET:
2120                                 if (!sacmp(saddr, (struct sockaddr *)
2121                                     &grp->gr_ptr.gt_net.nt_net,
2122                                     (struct sockaddr *)
2123                                     &grp->gr_ptr.gt_net.nt_mask)) {
2124                                         *hostsetp = (hp->ht_flag | DP_HOSTSET);
2125                                         if (numsecflavors != NULL) {
2126                                                 *numsecflavors =
2127                                                     grp->gr_numsecflavors;
2128                                                 *secflavorsp =
2129                                                     grp->gr_secflavors;
2130                                         }
2131                                         return (1);
2132                                 }
2133                                 break;
2134                         }
2135                         hp = hp->ht_next;
2136                 }
2137         }
2138         return (0);
2139 }
2140
2141 /*
2142  * Scan tree for a host that matches the address.
2143  */
2144 static int
2145 scan_tree(struct dirlist *dp, struct sockaddr *saddr)
2146 {
2147         int defset, hostset;
2148
2149         if (dp) {
2150                 if (scan_tree(dp->dp_left, saddr))
2151                         return (1);
2152                 if (chk_host(dp, saddr, &defset, &hostset, NULL, NULL))
2153                         return (1);
2154                 if (scan_tree(dp->dp_right, saddr))
2155                         return (1);
2156         }
2157         return (0);
2158 }
2159
2160 /*
2161  * Traverse the dirlist tree and free it up.
2162  */
2163 static void
2164 free_dir(struct dirlist *dp)
2165 {
2166
2167         if (dp) {
2168                 free_dir(dp->dp_left);
2169                 free_dir(dp->dp_right);
2170                 free_host(dp->dp_hosts);
2171                 free(dp->dp_dirp);
2172                 free(dp);
2173         }
2174 }
2175
2176 /*
2177  * Parse a colon separated list of security flavors
2178  */
2179 static int
2180 parsesec(char *seclist, struct exportlist *ep)
2181 {
2182         char *cp, savedc;
2183         int flavor;
2184
2185         ep->ex_numsecflavors = 0;
2186         for (;;) {
2187                 cp = strchr(seclist, ':');
2188                 if (cp) {
2189                         savedc = *cp;
2190                         *cp = '\0';
2191                 }
2192
2193                 if (!strcmp(seclist, "sys"))
2194                         flavor = AUTH_SYS;
2195                 else if (!strcmp(seclist, "krb5"))
2196                         flavor = RPCSEC_GSS_KRB5;
2197                 else if (!strcmp(seclist, "krb5i"))
2198                         flavor = RPCSEC_GSS_KRB5I;
2199                 else if (!strcmp(seclist, "krb5p"))
2200                         flavor = RPCSEC_GSS_KRB5P;
2201                 else {
2202                         if (cp)
2203                                 *cp = savedc;
2204                         syslog(LOG_ERR, "bad sec flavor: %s", seclist);
2205                         return (1);
2206                 }
2207                 if (ep->ex_numsecflavors == MAXSECFLAVORS) {
2208                         if (cp)
2209                                 *cp = savedc;
2210                         syslog(LOG_ERR, "too many sec flavors: %s", seclist);
2211                         return (1);
2212                 }
2213                 ep->ex_secflavors[ep->ex_numsecflavors] = flavor;
2214                 ep->ex_numsecflavors++;
2215                 if (cp) {
2216                         *cp = savedc;
2217                         seclist = cp + 1;
2218                 } else {
2219                         break;
2220                 }
2221         }
2222         return (0);
2223 }
2224
2225 /*
2226  * Parse the option string and update fields.
2227  * Option arguments may either be -<option>=<value> or
2228  * -<option> <value>
2229  */
2230 static int
2231 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp,
2232         int *has_hostp, int *exflagsp, struct xucred *cr)
2233 {
2234         char *cpoptarg, *cpoptend;
2235         char *cp, *endcp, *cpopt, savedc, savedc2;
2236         int allflag, usedarg;
2237
2238         savedc2 = '\0';
2239         cpopt = *cpp;
2240         cpopt++;
2241         cp = *endcpp;
2242         savedc = *cp;
2243         *cp = '\0';
2244         while (cpopt && *cpopt) {
2245                 allflag = 1;
2246                 usedarg = -2;
2247                 if ((cpoptend = strchr(cpopt, ','))) {
2248                         *cpoptend++ = '\0';
2249                         if ((cpoptarg = strchr(cpopt, '=')))
2250                                 *cpoptarg++ = '\0';
2251                 } else {
2252                         if ((cpoptarg = strchr(cpopt, '=')))
2253                                 *cpoptarg++ = '\0';
2254                         else {
2255                                 *cp = savedc;
2256                                 nextfield(&cp, &endcp);
2257                                 **endcpp = '\0';
2258                                 if (endcp > cp && *cp != '-') {
2259                                         cpoptarg = cp;
2260                                         savedc2 = *endcp;
2261                                         *endcp = '\0';
2262                                         usedarg = 0;
2263                                 }
2264                         }
2265                 }
2266                 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) {
2267                         *exflagsp |= MNT_EXRDONLY;
2268                 } else if (cpoptarg && (!strcmp(cpopt, "maproot") ||
2269                     !(allflag = strcmp(cpopt, "mapall")) ||
2270                     !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) {
2271                         usedarg++;
2272                         parsecred(cpoptarg, cr);
2273                         if (allflag == 0) {
2274                                 *exflagsp |= MNT_EXPORTANON;
2275                                 opt_flags |= OP_MAPALL;
2276                         } else
2277                                 opt_flags |= OP_MAPROOT;
2278                 } else if (cpoptarg && (!strcmp(cpopt, "mask") ||
2279                     !strcmp(cpopt, "m"))) {
2280                         if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) {
2281                                 syslog(LOG_ERR, "bad mask: %s", cpoptarg);
2282                                 return (1);
2283                         }
2284                         usedarg++;
2285                         opt_flags |= OP_MASK;
2286                 } else if (cpoptarg && (!strcmp(cpopt, "network") ||
2287                         !strcmp(cpopt, "n"))) {
2288                         if (strchr(cpoptarg, '/') != NULL) {
2289                                 if (debug)
2290                                         fprintf(stderr, "setting OP_MASKLEN\n");
2291                                 opt_flags |= OP_MASKLEN;
2292                         }
2293                         if (grp->gr_type != GT_NULL) {
2294                                 syslog(LOG_ERR, "network/host conflict");
2295                                 return (1);
2296                         } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) {
2297                                 syslog(LOG_ERR, "bad net: %s", cpoptarg);
2298                                 return (1);
2299                         }
2300                         grp->gr_type = GT_NET;
2301                         *has_hostp = 1;
2302                         usedarg++;
2303                         opt_flags |= OP_NET;
2304                 } else if (!strcmp(cpopt, "alldirs")) {
2305                         opt_flags |= OP_ALLDIRS;
2306                 } else if (!strcmp(cpopt, "public")) {
2307                         *exflagsp |= MNT_EXPUBLIC;
2308                 } else if (!strcmp(cpopt, "webnfs")) {
2309                         *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON);
2310                         opt_flags |= OP_MAPALL;
2311                 } else if (cpoptarg && !strcmp(cpopt, "index")) {
2312                         ep->ex_indexfile = strdup(cpoptarg);
2313                 } else if (!strcmp(cpopt, "quiet")) {
2314                         opt_flags |= OP_QUIET;
2315                 } else if (cpoptarg && !strcmp(cpopt, "sec")) {
2316                         if (parsesec(cpoptarg, ep))
2317                                 return (1);
2318                         opt_flags |= OP_SEC;
2319                         usedarg++;
2320                 } else {
2321                         syslog(LOG_ERR, "bad opt %s", cpopt);
2322                         return (1);
2323                 }
2324                 if (usedarg >= 0) {
2325                         *endcp = savedc2;
2326                         **endcpp = savedc;
2327                         if (usedarg > 0) {
2328                                 *cpp = cp;
2329                                 *endcpp = endcp;
2330                         }
2331                         return (0);
2332                 }
2333                 cpopt = cpoptend;
2334         }
2335         **endcpp = savedc;
2336         return (0);
2337 }
2338
2339 /*
2340  * Translate a character string to the corresponding list of network
2341  * addresses for a hostname.
2342  */
2343 static int
2344 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp)
2345 {
2346         struct grouplist *checkgrp;
2347         struct addrinfo *ai, *tai, hints;
2348         int ecode;
2349         char host[NI_MAXHOST];
2350
2351         if (grp->gr_type != GT_NULL) {
2352                 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp);
2353                 return (1);
2354         }
2355         memset(&hints, 0, sizeof hints);
2356         hints.ai_flags = AI_CANONNAME;
2357         hints.ai_protocol = IPPROTO_UDP;
2358         ecode = getaddrinfo(cp, NULL, &hints, &ai);
2359         if (ecode != 0) {
2360                 syslog(LOG_ERR,"can't get address info for host %s", cp);
2361                 return 1;
2362         }
2363         grp->gr_ptr.gt_addrinfo = ai;
2364         while (ai != NULL) {
2365                 if (ai->ai_canonname == NULL) {
2366                         if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host,
2367                             sizeof host, NULL, 0, NI_NUMERICHOST) != 0)
2368                                 strlcpy(host, "?", sizeof(host));
2369                         ai->ai_canonname = strdup(host);
2370                         ai->ai_flags |= AI_CANONNAME;
2371                 }
2372                 if (debug)
2373                         fprintf(stderr, "got host %s\n", ai->ai_canonname);
2374                 /*
2375                  * Sanity check: make sure we don't already have an entry
2376                  * for this host in the grouplist.
2377                  */
2378                 for (checkgrp = tgrp; checkgrp != NULL;
2379                     checkgrp = checkgrp->gr_next) {
2380                         if (checkgrp->gr_type != GT_HOST)
2381                                 continue;
2382                         for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL;
2383                             tai = tai->ai_next) {
2384                                 if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0)
2385                                         continue;
2386                                 if (debug)
2387                                         fprintf(stderr,
2388                                             "ignoring duplicate host %s\n",
2389                                             ai->ai_canonname);
2390                                 grp->gr_type = GT_IGNORE;
2391                                 return (0);
2392                         }
2393                 }
2394                 ai = ai->ai_next;
2395         }
2396         grp->gr_type = GT_HOST;
2397         return (0);
2398 }
2399
2400 /*
2401  * Free up an exports list component
2402  */
2403 static void
2404 free_exp(struct exportlist *ep)
2405 {
2406
2407         if (ep->ex_defdir) {
2408                 free_host(ep->ex_defdir->dp_hosts);
2409                 free((caddr_t)ep->ex_defdir);
2410         }
2411         if (ep->ex_fsdir)
2412                 free(ep->ex_fsdir);
2413         if (ep->ex_indexfile)
2414                 free(ep->ex_indexfile);
2415         free_dir(ep->ex_dirl);
2416         free((caddr_t)ep);
2417 }
2418
2419 /*
2420  * Free hosts.
2421  */
2422 static void
2423 free_host(struct hostlist *hp)
2424 {
2425         struct hostlist *hp2;
2426
2427         while (hp) {
2428                 hp2 = hp;
2429                 hp = hp->ht_next;
2430                 free((caddr_t)hp2);
2431         }
2432 }
2433
2434 static struct hostlist *
2435 get_ht(void)
2436 {
2437         struct hostlist *hp;
2438
2439         hp = (struct hostlist *)malloc(sizeof (struct hostlist));
2440         if (hp == (struct hostlist *)NULL)
2441                 out_of_mem();
2442         hp->ht_next = (struct hostlist *)NULL;
2443         hp->ht_flag = 0;
2444         return (hp);
2445 }
2446
2447 /*
2448  * Out of memory, fatal
2449  */
2450 static void
2451 out_of_mem(void)
2452 {
2453
2454         syslog(LOG_ERR, "out of memory");
2455         exit(2);
2456 }
2457
2458 /*
2459  * Do the nmount() syscall with the update flag to push the export info into
2460  * the kernel.
2461  */
2462 static int
2463 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags,
2464     struct xucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb)
2465 {
2466         struct statfs fsb1;
2467         struct addrinfo *ai;
2468         struct export_args *eap;
2469         char errmsg[255];
2470         char *cp;
2471         int done;
2472         char savedc;
2473         struct iovec *iov;
2474         int i, iovlen;
2475         int ret;
2476         struct nfsex_args nfsea;
2477
2478         eap = &nfsea.export;
2479
2480         cp = NULL;
2481         savedc = '\0';
2482         iov = NULL;
2483         iovlen = 0;
2484         ret = 0;
2485
2486         bzero(eap, sizeof (struct export_args));
2487         bzero(errmsg, sizeof(errmsg));
2488         eap->ex_flags = exflags;
2489         eap->ex_anon = *anoncrp;
2490         eap->ex_indexfile = ep->ex_indexfile;
2491         if (grp->gr_type == GT_HOST)
2492                 ai = grp->gr_ptr.gt_addrinfo;
2493         else
2494                 ai = NULL;
2495         eap->ex_numsecflavors = ep->ex_numsecflavors;
2496         for (i = 0; i < eap->ex_numsecflavors; i++)
2497                 eap->ex_secflavors[i] = ep->ex_secflavors[i];
2498         if (eap->ex_numsecflavors == 0) {
2499                 eap->ex_numsecflavors = 1;
2500                 eap->ex_secflavors[0] = AUTH_SYS;
2501         }
2502         done = FALSE;
2503
2504         if (v4root_phase == 0) {
2505                 build_iovec(&iov, &iovlen, "fstype", NULL, 0);
2506                 build_iovec(&iov, &iovlen, "fspath", NULL, 0);
2507                 build_iovec(&iov, &iovlen, "from", NULL, 0);
2508                 build_iovec(&iov, &iovlen, "update", NULL, 0);
2509                 build_iovec(&iov, &iovlen, "export", eap,
2510                     sizeof (struct export_args));
2511                 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
2512         }
2513
2514         while (!done) {
2515                 switch (grp->gr_type) {
2516                 case GT_HOST:
2517                         if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0)
2518                                 goto skip;
2519                         eap->ex_addr = ai->ai_addr;
2520                         eap->ex_addrlen = ai->ai_addrlen;
2521                         eap->ex_masklen = 0;
2522                         break;
2523                 case GT_NET:
2524                         if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 &&
2525                             have_v6 == 0)
2526                                 goto skip;
2527                         eap->ex_addr =
2528                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net;
2529                         eap->ex_addrlen =
2530                             ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_net)->sa_len;
2531                         eap->ex_mask =
2532                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask;
2533                         eap->ex_masklen = ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask)->sa_len;
2534                         break;
2535                 case GT_DEFAULT:
2536                         eap->ex_addr = NULL;
2537                         eap->ex_addrlen = 0;
2538                         eap->ex_mask = NULL;
2539                         eap->ex_masklen = 0;
2540                         break;
2541                 case GT_IGNORE:
2542                         ret = 0;
2543                         goto error_exit;
2544                         break;
2545                 default:
2546                         syslog(LOG_ERR, "bad grouptype");
2547                         if (cp)
2548                                 *cp = savedc;
2549                         ret = 1;
2550                         goto error_exit;
2551                 }
2552
2553                 /*
2554                  * For V4:, use the nfssvc() syscall, instead of mount().
2555                  */
2556                 if (v4root_phase == 2) {
2557                         nfsea.fspec = v4root_dirpath;
2558                         if (nfssvc(NFSSVC_V4ROOTEXPORT, (caddr_t)&nfsea) < 0) {
2559                                 syslog(LOG_ERR, "Exporting V4: failed");
2560                                 return (2);
2561                         }
2562                 } else {
2563                         /*
2564                          * XXX:
2565                          * Maybe I should just use the fsb->f_mntonname path
2566                          * instead of looping back up the dirp to the mount
2567                          * point??
2568                          * Also, needs to know how to export all types of local
2569                          * exportable filesystems and not just "ufs".
2570                          */
2571                         iov[1].iov_base = fsb->f_fstypename; /* "fstype" */
2572                         iov[1].iov_len = strlen(fsb->f_fstypename) + 1;
2573                         iov[3].iov_base = fsb->f_mntonname; /* "fspath" */
2574                         iov[3].iov_len = strlen(fsb->f_mntonname) + 1;
2575                         iov[5].iov_base = fsb->f_mntfromname; /* "from" */
2576                         iov[5].iov_len = strlen(fsb->f_mntfromname) + 1;
2577                         errmsg[0] = '\0';
2578
2579                         while (nmount(iov, iovlen, fsb->f_flags) < 0) {
2580                                 if (cp)
2581                                         *cp-- = savedc;
2582                                 else
2583                                         cp = dirp + dirplen - 1;
2584                                 if (opt_flags & OP_QUIET) {
2585                                         ret = 1;
2586                                         goto error_exit;
2587                                 }
2588                                 if (errno == EPERM) {
2589                                         if (debug)
2590                                                 warnx("can't change attributes for %s: %s",
2591                                                     dirp, errmsg);
2592                                         syslog(LOG_ERR,
2593                                            "can't change attributes for %s: %s",
2594                                             dirp, errmsg);
2595                                         ret = 1;
2596                                         goto error_exit;
2597                                 }
2598                                 if (opt_flags & OP_ALLDIRS) {
2599                                         if (errno == EINVAL)
2600                                                 syslog(LOG_ERR,
2601                 "-alldirs requested but %s is not a filesystem mountpoint",
2602                                                     dirp);
2603                                         else
2604                                                 syslog(LOG_ERR,
2605                                                     "could not remount %s: %m",
2606                                                     dirp);
2607                                         ret = 1;
2608                                         goto error_exit;
2609                                 }
2610                                 /* back up over the last component */
2611                                 while (*cp == '/' && cp > dirp)
2612                                         cp--;
2613                                 while (*(cp - 1) != '/' && cp > dirp)
2614                                         cp--;
2615                                 if (cp == dirp) {
2616                                         if (debug)
2617                                                 warnx("mnt unsucc");
2618                                         syslog(LOG_ERR, "can't export %s %s",
2619                                             dirp, errmsg);
2620                                         ret = 1;
2621                                         goto error_exit;
2622                                 }
2623                                 savedc = *cp;
2624                                 *cp = '\0';
2625                                 /*
2626                                  * Check that we're still on the same
2627                                  * filesystem.
2628                                  */
2629                                 if (statfs(dirp, &fsb1) != 0 ||
2630                                     bcmp(&fsb1.f_fsid, &fsb->f_fsid,
2631                                     sizeof (fsb1.f_fsid)) != 0) {
2632                                         *cp = savedc;
2633                                         syslog(LOG_ERR,
2634                                             "can't export %s %s", dirp,
2635                                             errmsg);
2636                                         ret = 1;
2637                                         goto error_exit;
2638                                 }
2639                         }
2640                 }
2641
2642                 /*
2643                  * For the experimental server:
2644                  * If this is the public directory, get the file handle
2645                  * and load it into the kernel via the nfssvc() syscall.
2646                  */
2647                 if ((exflags & MNT_EXPUBLIC) != 0) {
2648                         fhandle_t fh;
2649                         char *public_name;
2650
2651                         if (eap->ex_indexfile != NULL)
2652                                 public_name = eap->ex_indexfile;
2653                         else
2654                                 public_name = dirp;
2655                         if (getfh(public_name, &fh) < 0)
2656                                 syslog(LOG_ERR,
2657                                     "Can't get public fh for %s", public_name);
2658                         else if (nfssvc(NFSSVC_PUBLICFH, (caddr_t)&fh) < 0)
2659                                 syslog(LOG_ERR,
2660                                     "Can't set public fh for %s", public_name);
2661                         else
2662                                 has_publicfh = 1;
2663                 }
2664 skip:
2665                 if (ai != NULL)
2666                         ai = ai->ai_next;
2667                 if (ai == NULL)
2668                         done = TRUE;
2669         }
2670         if (cp)
2671                 *cp = savedc;
2672 error_exit:
2673         /* free strings allocated by strdup() in getmntopts.c */
2674         if (iov != NULL) {
2675                 free(iov[0].iov_base); /* fstype */
2676                 free(iov[2].iov_base); /* fspath */
2677                 free(iov[4].iov_base); /* from */
2678                 free(iov[6].iov_base); /* update */
2679                 free(iov[8].iov_base); /* export */
2680                 free(iov[10].iov_base); /* errmsg */
2681
2682                 /* free iov, allocated by realloc() */
2683                 free(iov);
2684         }
2685         return (ret);
2686 }
2687
2688 /*
2689  * Translate a net address.
2690  *
2691  * If `maskflg' is nonzero, then `cp' is a netmask, not a network address.
2692  */
2693 static int
2694 get_net(char *cp, struct netmsk *net, int maskflg)
2695 {
2696         struct netent *np = NULL;
2697         char *name, *p, *prefp;
2698         struct sockaddr_in sin;
2699         struct sockaddr *sa = NULL;
2700         struct addrinfo hints, *ai = NULL;
2701         char netname[NI_MAXHOST];
2702         long preflen;
2703
2704         p = prefp = NULL;
2705         if ((opt_flags & OP_MASKLEN) && !maskflg) {
2706                 p = strchr(cp, '/');
2707                 *p = '\0';
2708                 prefp = p + 1;
2709         }
2710
2711         /*
2712          * Check for a numeric address first. We wish to avoid
2713          * possible DNS lookups in getnetbyname().
2714          */
2715         if (isxdigit(*cp) || *cp == ':') {
2716                 memset(&hints, 0, sizeof hints);
2717                 /* Ensure the mask and the network have the same family. */
2718                 if (maskflg && (opt_flags & OP_NET))
2719                         hints.ai_family = net->nt_net.ss_family;
2720                 else if (!maskflg && (opt_flags & OP_HAVEMASK))
2721                         hints.ai_family = net->nt_mask.ss_family;
2722                 else
2723                         hints.ai_family = AF_UNSPEC;
2724                 hints.ai_flags = AI_NUMERICHOST;
2725                 if (getaddrinfo(cp, NULL, &hints, &ai) == 0)
2726                         sa = ai->ai_addr;
2727                 if (sa != NULL && ai->ai_family == AF_INET) {
2728                         /*
2729                          * The address in `cp' is really a network address, so
2730                          * use inet_network() to re-interpret this correctly.
2731                          * e.g. "127.1" means 127.1.0.0, not 127.0.0.1.
2732                          */
2733                         bzero(&sin, sizeof sin);
2734                         sin.sin_family = AF_INET;
2735                         sin.sin_len = sizeof sin;
2736                         sin.sin_addr = inet_makeaddr(inet_network(cp), 0);
2737                         if (debug)
2738                                 fprintf(stderr, "get_net: v4 addr %s\n",
2739                                     inet_ntoa(sin.sin_addr));
2740                         sa = (struct sockaddr *)&sin;
2741                 }
2742         }
2743         if (sa == NULL && (np = getnetbyname(cp)) != NULL) {
2744                 bzero(&sin, sizeof sin);
2745                 sin.sin_family = AF_INET;
2746                 sin.sin_len = sizeof sin;
2747                 sin.sin_addr = inet_makeaddr(np->n_net, 0);
2748                 sa = (struct sockaddr *)&sin;
2749         }
2750         if (sa == NULL)
2751                 goto fail;
2752
2753         if (maskflg) {
2754                 /* The specified sockaddr is a mask. */
2755                 if (checkmask(sa) != 0)
2756                         goto fail;
2757                 bcopy(sa, &net->nt_mask, sa->sa_len);
2758                 opt_flags |= OP_HAVEMASK;
2759         } else {
2760                 /* The specified sockaddr is a network address. */
2761                 bcopy(sa, &net->nt_net, sa->sa_len);
2762
2763                 /* Get a network name for the export list. */
2764                 if (np) {
2765                         name = np->n_name;
2766                 } else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname,
2767                    NULL, 0, NI_NUMERICHOST) == 0) {
2768                         name = netname;
2769                 } else {
2770                         goto fail;
2771                 }
2772                 if ((net->nt_name = strdup(name)) == NULL)
2773                         out_of_mem();
2774
2775                 /*
2776                  * Extract a mask from either a "/<masklen>" suffix, or
2777                  * from the class of an IPv4 address.
2778                  */
2779                 if (opt_flags & OP_MASKLEN) {
2780                         preflen = strtol(prefp, NULL, 10);
2781                         if (preflen < 0L || preflen == LONG_MAX)
2782                                 goto fail;
2783                         bcopy(sa, &net->nt_mask, sa->sa_len);
2784                         if (makemask(&net->nt_mask, (int)preflen) != 0)
2785                                 goto fail;
2786                         opt_flags |= OP_HAVEMASK;
2787                         *p = '/';
2788                 } else if (sa->sa_family == AF_INET &&
2789                     (opt_flags & OP_MASK) == 0) {
2790                         in_addr_t addr;
2791
2792                         addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
2793                         if (IN_CLASSA(addr))
2794                                 preflen = 8;
2795                         else if (IN_CLASSB(addr))
2796                                 preflen = 16;
2797                         else if (IN_CLASSC(addr))
2798                                 preflen = 24;
2799                         else if (IN_CLASSD(addr))
2800                                 preflen = 28;
2801                         else
2802                                 preflen = 32;   /* XXX */
2803
2804                         bcopy(sa, &net->nt_mask, sa->sa_len);
2805                         makemask(&net->nt_mask, (int)preflen);
2806                         opt_flags |= OP_HAVEMASK;
2807                 }
2808         }
2809
2810         if (ai)
2811                 freeaddrinfo(ai);
2812         return 0;
2813
2814 fail:
2815         if (ai)
2816                 freeaddrinfo(ai);
2817         return 1;
2818 }
2819
2820 /*
2821  * Parse out the next white space separated field
2822  */
2823 static void
2824 nextfield(char **cp, char **endcp)
2825 {
2826         char *p;
2827
2828         p = *cp;
2829         while (*p == ' ' || *p == '\t')
2830                 p++;
2831         if (*p == '\n' || *p == '\0')
2832                 *cp = *endcp = p;
2833         else {
2834                 *cp = p++;
2835                 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
2836                         p++;
2837                 *endcp = p;
2838         }
2839 }
2840
2841 /*
2842  * Get an exports file line. Skip over blank lines and handle line
2843  * continuations.
2844  */
2845 static int
2846 get_line(void)
2847 {
2848         char *p, *cp;
2849         size_t len;
2850         int totlen, cont_line;
2851
2852         /*
2853          * Loop around ignoring blank lines and getting all continuation lines.
2854          */
2855         p = line;
2856         totlen = 0;
2857         do {
2858                 if ((p = fgetln(exp_file, &len)) == NULL)
2859                         return (0);
2860                 cp = p + len - 1;
2861                 cont_line = 0;
2862                 while (cp >= p &&
2863                     (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) {
2864                         if (*cp == '\\')
2865                                 cont_line = 1;
2866                         cp--;
2867                         len--;
2868                 }
2869                 if (cont_line) {
2870                         *++cp = ' ';
2871                         len++;
2872                 }
2873                 if (linesize < len + totlen + 1) {
2874                         linesize = len + totlen + 1;
2875                         line = realloc(line, linesize);
2876                         if (line == NULL)
2877                                 out_of_mem();
2878                 }
2879                 memcpy(line + totlen, p, len);
2880                 totlen += len;
2881                 line[totlen] = '\0';
2882         } while (totlen == 0 || cont_line);
2883         return (1);
2884 }
2885
2886 /*
2887  * Parse a description of a credential.
2888  */
2889 static void
2890 parsecred(char *namelist, struct xucred *cr)
2891 {
2892         char *name;
2893         int cnt;
2894         char *names;
2895         struct passwd *pw;
2896         struct group *gr;
2897         gid_t groups[XU_NGROUPS + 1];
2898         int ngroups;
2899
2900         cr->cr_version = XUCRED_VERSION;
2901         /*
2902          * Set up the unprivileged user.
2903          */
2904         cr->cr_uid = 65534;
2905         cr->cr_groups[0] = 65533;
2906         cr->cr_ngroups = 1;
2907         /*
2908          * Get the user's password table entry.
2909          */
2910         names = strsep_quote(&namelist, " \t\n");
2911         name = strsep(&names, ":");
2912         /* Bug?  name could be NULL here */
2913         if (isdigit(*name) || *name == '-')
2914                 pw = getpwuid(atoi(name));
2915         else
2916                 pw = getpwnam(name);
2917         /*
2918          * Credentials specified as those of a user.
2919          */
2920         if (names == NULL) {
2921                 if (pw == NULL) {
2922                         syslog(LOG_ERR, "unknown user: %s", name);
2923                         return;
2924                 }
2925                 cr->cr_uid = pw->pw_uid;
2926                 ngroups = XU_NGROUPS + 1;
2927                 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups)) {
2928                         syslog(LOG_ERR, "too many groups");
2929                         ngroups = XU_NGROUPS + 1;
2930                 }
2931
2932                 /*
2933                  * Compress out duplicate.
2934                  */
2935                 cr->cr_ngroups = ngroups - 1;
2936                 cr->cr_groups[0] = groups[0];
2937                 for (cnt = 2; cnt < ngroups; cnt++)
2938                         cr->cr_groups[cnt - 1] = groups[cnt];
2939                 return;
2940         }
2941         /*
2942          * Explicit credential specified as a colon separated list:
2943          *      uid:gid:gid:...
2944          */
2945         if (pw != NULL)
2946                 cr->cr_uid = pw->pw_uid;
2947         else if (isdigit(*name) || *name == '-')
2948                 cr->cr_uid = atoi(name);
2949         else {
2950                 syslog(LOG_ERR, "unknown user: %s", name);
2951                 return;
2952         }
2953         cr->cr_ngroups = 0;
2954         while (names != NULL && *names != '\0' && cr->cr_ngroups < XU_NGROUPS) {
2955                 name = strsep(&names, ":");
2956                 if (isdigit(*name) || *name == '-') {
2957                         cr->cr_groups[cr->cr_ngroups++] = atoi(name);
2958                 } else {
2959                         if ((gr = getgrnam(name)) == NULL) {
2960                                 syslog(LOG_ERR, "unknown group: %s", name);
2961                                 continue;
2962                         }
2963                         cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid;
2964                 }
2965         }
2966         if (names != NULL && *names != '\0' && cr->cr_ngroups == XU_NGROUPS)
2967                 syslog(LOG_ERR, "too many groups");
2968 }
2969
2970 #define STRSIZ  (MNTNAMLEN+MNTPATHLEN+50)
2971 /*
2972  * Routines that maintain the remote mounttab
2973  */
2974 static void
2975 get_mountlist(void)
2976 {
2977         struct mountlist *mlp;
2978         char *host, *dirp, *cp;
2979         char str[STRSIZ];
2980         FILE *mlfile;
2981
2982         if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) {
2983                 if (errno == ENOENT)
2984                         return;
2985                 else {
2986                         syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST);
2987                         return;
2988                 }
2989         }
2990         while (fgets(str, STRSIZ, mlfile) != NULL) {
2991                 cp = str;
2992                 host = strsep(&cp, " \t\n");
2993                 dirp = strsep(&cp, " \t\n");
2994                 if (host == NULL || dirp == NULL)
2995                         continue;
2996                 mlp = (struct mountlist *)malloc(sizeof (*mlp));
2997                 if (mlp == (struct mountlist *)NULL)
2998                         out_of_mem();
2999                 strncpy(mlp->ml_host, host, MNTNAMLEN);
3000                 mlp->ml_host[MNTNAMLEN] = '\0';
3001                 strncpy(mlp->ml_dirp, dirp, MNTPATHLEN);
3002                 mlp->ml_dirp[MNTPATHLEN] = '\0';
3003
3004                 SLIST_INSERT_HEAD(&mlhead, mlp, next);
3005         }
3006         fclose(mlfile);
3007 }
3008
3009 static void
3010 del_mlist(char *hostp, char *dirp)
3011 {
3012         struct mountlist *mlp, *mlp2;
3013         FILE *mlfile;
3014         int fnd = 0;
3015
3016         SLIST_FOREACH_SAFE(mlp, &mlhead, next, mlp2) {
3017                 if (!strcmp(mlp->ml_host, hostp) &&
3018                     (!dirp || !strcmp(mlp->ml_dirp, dirp))) {
3019                         fnd = 1;
3020                         SLIST_REMOVE(&mlhead, mlp, mountlist, next);
3021                         free((caddr_t)mlp);
3022                 }
3023         }
3024         if (fnd) {
3025                 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) {
3026                         syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST);
3027                         return;
3028                 }
3029                 SLIST_FOREACH(mlp, &mlhead, next) {
3030                         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
3031                 }
3032                 fclose(mlfile);
3033         }
3034 }
3035
3036 static void
3037 add_mlist(char *hostp, char *dirp)
3038 {
3039         struct mountlist *mlp;
3040         FILE *mlfile;
3041
3042         SLIST_FOREACH(mlp, &mlhead, next) {
3043                 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp))
3044                         return;
3045         }
3046
3047         mlp = (struct mountlist *)malloc(sizeof (*mlp));
3048         if (mlp == (struct mountlist *)NULL)
3049                 out_of_mem();
3050         strncpy(mlp->ml_host, hostp, MNTNAMLEN);
3051         mlp->ml_host[MNTNAMLEN] = '\0';
3052         strncpy(mlp->ml_dirp, dirp, MNTPATHLEN);
3053         mlp->ml_dirp[MNTPATHLEN] = '\0';
3054         SLIST_INSERT_HEAD(&mlhead, mlp, next);
3055         if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
3056                 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST);
3057                 return;
3058         }
3059         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
3060         fclose(mlfile);
3061 }
3062
3063 /*
3064  * Free up a group list.
3065  */
3066 static void
3067 free_grp(struct grouplist *grp)
3068 {
3069         if (grp->gr_type == GT_HOST) {
3070                 if (grp->gr_ptr.gt_addrinfo != NULL)
3071                         freeaddrinfo(grp->gr_ptr.gt_addrinfo);
3072         } else if (grp->gr_type == GT_NET) {
3073                 if (grp->gr_ptr.gt_net.nt_name)
3074                         free(grp->gr_ptr.gt_net.nt_name);
3075         }
3076         free((caddr_t)grp);
3077 }
3078
3079 #ifdef DEBUG
3080 static void
3081 SYSLOG(int pri, const char *fmt, ...)
3082 {
3083         va_list ap;
3084
3085         va_start(ap, fmt);
3086         vfprintf(stderr, fmt, ap);
3087         va_end(ap);
3088 }
3089 #endif /* DEBUG */
3090
3091 /*
3092  * Check options for consistency.
3093  */
3094 static int
3095 check_options(struct dirlist *dp)
3096 {
3097
3098         if (v4root_phase == 0 && dp == NULL)
3099             return (1);
3100         if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL)) {
3101             syslog(LOG_ERR, "-mapall and -maproot mutually exclusive");
3102             return (1);
3103         }
3104         if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) {
3105                 syslog(LOG_ERR, "-mask requires -network");
3106                 return (1);
3107         }
3108         if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) {
3109                 syslog(LOG_ERR, "-network requires mask specification");
3110                 return (1);
3111         }
3112         if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) {
3113                 syslog(LOG_ERR, "-mask and /masklen are mutually exclusive");
3114                 return (1);
3115         }
3116         if (v4root_phase > 0 &&
3117             (opt_flags &
3118              ~(OP_SEC | OP_MASK | OP_NET | OP_HAVEMASK | OP_MASKLEN)) != 0) {
3119             syslog(LOG_ERR,"only -sec,-net,-mask options allowed on V4:");
3120             return (1);
3121         }
3122         if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
3123             syslog(LOG_ERR, "-alldirs has multiple directories");
3124             return (1);
3125         }
3126         return (0);
3127 }
3128
3129 /*
3130  * Check an absolute directory path for any symbolic links. Return true
3131  */
3132 static int
3133 check_dirpath(char *dirp)
3134 {
3135         char *cp;
3136         int ret = 1;
3137         struct stat sb;
3138
3139         cp = dirp + 1;
3140         while (*cp && ret) {
3141                 if (*cp == '/') {
3142                         *cp = '\0';
3143                         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
3144                                 ret = 0;
3145                         *cp = '/';
3146                 }
3147                 cp++;
3148         }
3149         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
3150                 ret = 0;
3151         return (ret);
3152 }
3153
3154 /*
3155  * Make a netmask according to the specified prefix length. The ss_family
3156  * and other non-address fields must be initialised before calling this.
3157  */
3158 static int
3159 makemask(struct sockaddr_storage *ssp, int bitlen)
3160 {
3161         u_char *p;
3162         int bits, i, len;
3163
3164         if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL)
3165                 return (-1);
3166         if (bitlen > len * CHAR_BIT)
3167                 return (-1);
3168
3169         for (i = 0; i < len; i++) {
3170                 bits = MIN(CHAR_BIT, bitlen);
3171                 *p++ = (u_char)~0 << (CHAR_BIT - bits);
3172                 bitlen -= bits;
3173         }
3174         return 0;
3175 }
3176
3177 /*
3178  * Check that the sockaddr is a valid netmask. Returns 0 if the mask
3179  * is acceptable (i.e. of the form 1...10....0).
3180  */
3181 static int
3182 checkmask(struct sockaddr *sa)
3183 {
3184         u_char *mask;
3185         int i, len;
3186
3187         if ((mask = sa_rawaddr(sa, &len)) == NULL)
3188                 return (-1);
3189
3190         for (i = 0; i < len; i++)
3191                 if (mask[i] != 0xff)
3192                         break;
3193         if (i < len) {
3194                 if (~mask[i] & (u_char)(~mask[i] + 1))
3195                         return (-1);
3196                 i++;
3197         }
3198         for (; i < len; i++)
3199                 if (mask[i] != 0)
3200                         return (-1);
3201         return (0);
3202 }
3203
3204 /*
3205  * Compare two sockaddrs according to a specified mask. Return zero if
3206  * `sa1' matches `sa2' when filtered by the netmask in `samask'.
3207  * If samask is NULL, perform a full comparison.
3208  */
3209 static int
3210 sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask)
3211 {
3212         unsigned char *p1, *p2, *mask;
3213         int len, i;
3214
3215         if (sa1->sa_family != sa2->sa_family ||
3216             (p1 = sa_rawaddr(sa1, &len)) == NULL ||
3217             (p2 = sa_rawaddr(sa2, NULL)) == NULL)
3218                 return (1);
3219
3220         switch (sa1->sa_family) {
3221         case AF_INET6:
3222                 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
3223                     ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
3224                         return (1);
3225                 break;
3226         }
3227
3228         /* Simple binary comparison if no mask specified. */
3229         if (samask == NULL)
3230                 return (memcmp(p1, p2, len));
3231
3232         /* Set up the mask, and do a mask-based comparison. */
3233         if (sa1->sa_family != samask->sa_family ||
3234             (mask = sa_rawaddr(samask, NULL)) == NULL)
3235                 return (1);
3236
3237         for (i = 0; i < len; i++)
3238                 if ((p1[i] & mask[i]) != (p2[i] & mask[i]))
3239                         return (1);
3240         return (0);
3241 }
3242
3243 /*
3244  * Return a pointer to the part of the sockaddr that contains the
3245  * raw address, and set *nbytes to its length in bytes. Returns
3246  * NULL if the address family is unknown.
3247  */
3248 static void *
3249 sa_rawaddr(struct sockaddr *sa, int *nbytes) {
3250         void *p;
3251         int len;
3252
3253         switch (sa->sa_family) {
3254         case AF_INET:
3255                 len = sizeof(((struct sockaddr_in *)sa)->sin_addr);
3256                 p = &((struct sockaddr_in *)sa)->sin_addr;
3257                 break;
3258         case AF_INET6:
3259                 len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr);
3260                 p = &((struct sockaddr_in6 *)sa)->sin6_addr;
3261                 break;
3262         default:
3263                 p = NULL;
3264                 len = 0;
3265         }
3266
3267         if (nbytes != NULL)
3268                 *nbytes = len;
3269         return (p);
3270 }
3271
3272 static void
3273 huphandler(int sig __unused)
3274 {
3275
3276         got_sighup = 1;
3277 }
3278
3279 static void
3280 terminate(int sig __unused)
3281 {
3282         pidfile_remove(pfh);
3283         rpcb_unset(MOUNTPROG, MOUNTVERS, NULL);
3284         rpcb_unset(MOUNTPROG, MOUNTVERS3, NULL);
3285         exit (0);
3286 }