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  * 4. 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)-2,
 239         1,
 240         { (gid_t)-2 },
 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                 if (nconf->nc_semantics != NC_TPI_CLTS)
 912                         listen(fd, SOMAXCONN);
 913
 914                 if (nconf->nc_semantics == NC_TPI_CLTS )
 915                         transp = svc_dg_create(fd, 0, 0);
 916                 else
 917                         transp = svc_vc_create(fd, RPC_MAXDATASIZE,
 918                             RPC_MAXDATASIZE);
 919
 920                 if (transp != (SVCXPRT *) NULL) {
 921                         if (!svc_reg(transp, MOUNTPROG, MOUNTVERS, mntsrv,
 922                             NULL))
 923                                 syslog(LOG_ERR,
 924                                     "can't register %s MOUNTVERS service",
 925                                     nconf->nc_netid);
 926                         if (!force_v2) {
 927                                 if (!svc_reg(transp, MOUNTPROG, MOUNTVERS3,
 928                                     mntsrv, NULL))
 929                                         syslog(LOG_ERR,
 930                                             "can't register %s MOUNTVERS3 service",
 931                                             nconf->nc_netid);
 932                         }
 933                 } else
 934                         syslog(LOG_WARNING, "can't create %s services",
 935                             nconf->nc_netid);
 936
 937                 if (registered == 0) {
 938                         registered = 1;
 939                         memset(&hints, 0, sizeof hints);
 940                         hints.ai_flags = AI_PASSIVE;
 941                         hints.ai_family = si.si_af;
 942                         hints.ai_socktype = si.si_socktype;
 943                         hints.ai_protocol = si.si_proto;
 944
 945                         if ((aicode = getaddrinfo(NULL, port_str, &hints,
 946                             &res)) != 0) {
 947                                 syslog(LOG_ERR, "cannot get local address: %s",
 948                                     gai_strerror(aicode));
 949                                 exit(1);
 950                         }
 951
 952                         servaddr.buf = malloc(res->ai_addrlen);
 953                         memcpy(servaddr.buf, res->ai_addr, res->ai_addrlen);
 954                         servaddr.len = res->ai_addrlen;
 955
 956                         rpcb_set(MOUNTPROG, MOUNTVERS, nconf, &servaddr);
 957                         rpcb_set(MOUNTPROG, MOUNTVERS3, nconf, &servaddr);
 958
 959                         xcreated++;
 960                         freeaddrinfo(res);
 961                 }
 962         } /* end while */
 963 }
 964
 965 /*
 966  * Clear out sockets after a failure to bind one of them, so that the
 967  * cycle of socket creation/binding can start anew.
 968  */
 969 static void
 970 clearout_service(void)
 971 {
 972         int i;
 973
 974         for (i = 0; i < sock_fdcnt; i++) {
 975                 if (sock_fd[i] >= 0) {
 976                         shutdown(sock_fd[i], SHUT_RDWR);
 977                         close(sock_fd[i]);
 978                 }
 979         }
 980 }
 981
 982 static void
 983 usage(void)
 984 {
 985         fprintf(stderr,
 986                 "usage: mountd [-2] [-d] [-e] [-l] [-n] [-p <port>] [-r] "
 987                 "[-S] [-h <bindip>] [export_file ...]\n");
 988         exit(1);
 989 }
 990
 991 /*
 992  * The mount rpc service
 993  */
 994 void
 995 mntsrv(struct svc_req *rqstp, SVCXPRT *transp)
 996 {
 997         struct exportlist *ep;
 998         struct dirlist *dp;
 999         struct fhreturn fhr;
1000         struct stat stb;
1001         struct statfs fsb;
1002         char host[NI_MAXHOST], numerichost[NI_MAXHOST];
1003         int lookup_failed = 1;
1004         struct sockaddr *saddr;
1005         u_short sport;
1006         char rpcpath[MNTPATHLEN + 1], dirpath[MAXPATHLEN];
1007         int bad = 0, defset, hostset;
1008         sigset_t sighup_mask;
1009         int numsecflavors, *secflavorsp;
1010
1011         sigemptyset(&sighup_mask);
1012         sigaddset(&sighup_mask, SIGHUP);
1013         saddr = svc_getrpccaller(transp)->buf;
1014         switch (saddr->sa_family) {
1015         case AF_INET6:
1016                 sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port);
1017                 break;
1018         case AF_INET:
1019                 sport = ntohs(((struct sockaddr_in *)saddr)->sin_port);
1020                 break;
1021         default:
1022                 syslog(LOG_ERR, "request from unknown address family");
1023                 return;
1024         }
1025         lookup_failed = getnameinfo(saddr, saddr->sa_len, host, sizeof host,
1026             NULL, 0, 0);
1027         getnameinfo(saddr, saddr->sa_len, numerichost,
1028             sizeof numerichost, NULL, 0, NI_NUMERICHOST);
1029         switch (rqstp->rq_proc) {
1030         case NULLPROC:
1031                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
1032                         syslog(LOG_ERR, "can't send reply");
1033                 return;
1034         case MOUNTPROC_MNT:
1035                 if (sport >= IPPORT_RESERVED && resvport_only) {
1036                         syslog(LOG_NOTICE,
1037                             "mount request from %s from unprivileged port",
1038                             numerichost);
1039                         svcerr_weakauth(transp);
1040                         return;
1041                 }
1042                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
1043                         syslog(LOG_NOTICE, "undecodable mount request from %s",
1044                             numerichost);
1045                         svcerr_decode(transp);
1046                         return;
1047                 }
1048
1049                 /*
1050                  * Get the real pathname and make sure it is a directory
1051                  * or a regular file if the -r option was specified
1052                  * and it exists.
1053                  */
1054                 if (realpath(rpcpath, dirpath) == NULL ||
1055                     stat(dirpath, &stb) < 0 ||
1056                     statfs(dirpath, &fsb) < 0) {
1057                         chdir("/");     /* Just in case realpath doesn't */
1058                         syslog(LOG_NOTICE,
1059                             "mount request from %s for non existent path %s",
1060                             numerichost, dirpath);
1061                         if (debug)
1062                                 warnx("stat failed on %s", dirpath);
1063                         bad = ENOENT;   /* We will send error reply later */
1064                 }
1065                 if (!bad &&
1066                     !S_ISDIR(stb.st_mode) &&
1067                     (dir_only || !S_ISREG(stb.st_mode))) {
1068                         syslog(LOG_NOTICE,
1069                             "mount request from %s for non-directory path %s",
1070                             numerichost, dirpath);
1071                         if (debug)
1072                                 warnx("mounting non-directory %s", dirpath);
1073                         bad = ENOTDIR;  /* We will send error reply later */
1074                 }
1075
1076                 /* Check in the exports list */
1077                 sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
1078                 if (bad)
1079                         ep = NULL;
1080                 else
1081                         ep = ex_search(&fsb.f_fsid);
1082                 hostset = defset = 0;
1083                 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset,
1084                     &numsecflavors, &secflavorsp) ||
1085                     ((dp = dirp_search(ep->ex_dirl, dirpath)) &&
1086                       chk_host(dp, saddr, &defset, &hostset, &numsecflavors,
1087                        &secflavorsp)) ||
1088                     (defset && scan_tree(ep->ex_defdir, saddr) == 0 &&
1089                      scan_tree(ep->ex_dirl, saddr) == 0))) {
1090                         if (bad) {
1091                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
1092                                     (caddr_t)&bad))
1093                                         syslog(LOG_ERR, "can't send reply");
1094                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1095                                 return;
1096                         }
1097                         if (hostset & DP_HOSTSET) {
1098                                 fhr.fhr_flag = hostset;
1099                                 fhr.fhr_numsecflavors = numsecflavors;
1100                                 fhr.fhr_secflavors = secflavorsp;
1101                         } else {
1102                                 fhr.fhr_flag = defset;
1103                                 fhr.fhr_numsecflavors = ep->ex_defnumsecflavors;
1104                                 fhr.fhr_secflavors = ep->ex_defsecflavors;
1105                         }
1106                         fhr.fhr_vers = rqstp->rq_vers;
1107                         /* Get the file handle */
1108                         memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t));
1109                         if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) {
1110                                 bad = errno;
1111                                 syslog(LOG_ERR, "can't get fh for %s", dirpath);
1112                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
1113                                     (caddr_t)&bad))
1114                                         syslog(LOG_ERR, "can't send reply");
1115                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1116                                 return;
1117                         }
1118                         if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs,
1119                             (caddr_t)&fhr))
1120                                 syslog(LOG_ERR, "can't send reply");
1121                         if (!lookup_failed)
1122                                 add_mlist(host, dirpath);
1123                         else
1124                                 add_mlist(numerichost, dirpath);
1125                         if (debug)
1126                                 warnx("mount successful");
1127                         if (dolog)
1128                                 syslog(LOG_NOTICE,
1129                                     "mount request succeeded from %s for %s",
1130                                     numerichost, dirpath);
1131                 } else {
1132                         if (!bad)
1133                                 bad = EACCES;
1134                         syslog(LOG_NOTICE,
1135                             "mount request denied from %s for %s",
1136                             numerichost, dirpath);
1137                 }
1138
1139                 if (bad && !svc_sendreply(transp, (xdrproc_t)xdr_long,
1140                     (caddr_t)&bad))
1141                         syslog(LOG_ERR, "can't send reply");
1142                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1143                 return;
1144         case MOUNTPROC_DUMP:
1145                 if (!svc_sendreply(transp, (xdrproc_t)xdr_mlist, (caddr_t)NULL))
1146                         syslog(LOG_ERR, "can't send reply");
1147                 else if (dolog)
1148                         syslog(LOG_NOTICE,
1149                             "dump request succeeded from %s",
1150                             numerichost);
1151                 return;
1152         case MOUNTPROC_UMNT:
1153                 if (sport >= IPPORT_RESERVED && resvport_only) {
1154                         syslog(LOG_NOTICE,
1155                             "umount request from %s from unprivileged port",
1156                             numerichost);
1157                         svcerr_weakauth(transp);
1158                         return;
1159                 }
1160                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
1161                         syslog(LOG_NOTICE, "undecodable umount request from %s",
1162                             numerichost);
1163                         svcerr_decode(transp);
1164                         return;
1165                 }
1166                 if (realpath(rpcpath, dirpath) == NULL) {
1167                         syslog(LOG_NOTICE, "umount request from %s "
1168                             "for non existent path %s",
1169                             numerichost, dirpath);
1170                 }
1171                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL))
1172                         syslog(LOG_ERR, "can't send reply");
1173                 if (!lookup_failed)
1174                         del_mlist(host, dirpath);
1175                 del_mlist(numerichost, dirpath);
1176                 if (dolog)
1177                         syslog(LOG_NOTICE,
1178                             "umount request succeeded from %s for %s",
1179                             numerichost, dirpath);
1180                 return;
1181         case MOUNTPROC_UMNTALL:
1182                 if (sport >= IPPORT_RESERVED && resvport_only) {
1183                         syslog(LOG_NOTICE,
1184                             "umountall request from %s from unprivileged port",
1185                             numerichost);
1186                         svcerr_weakauth(transp);
1187                         return;
1188                 }
1189                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL))
1190                         syslog(LOG_ERR, "can't send reply");
1191                 if (!lookup_failed)
1192                         del_mlist(host, NULL);
1193                 del_mlist(numerichost, NULL);
1194                 if (dolog)
1195                         syslog(LOG_NOTICE,
1196                             "umountall request succeeded from %s",
1197                             numerichost);
1198                 return;
1199         case MOUNTPROC_EXPORT:
1200                 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, (caddr_t)NULL))
1201                         if (!svc_sendreply(transp, (xdrproc_t)xdr_explist_brief,
1202                             (caddr_t)NULL))
1203                                 syslog(LOG_ERR, "can't send reply");
1204                 if (dolog)
1205                         syslog(LOG_NOTICE,
1206                             "export request succeeded from %s",
1207                             numerichost);
1208                 return;
1209         default:
1210                 svcerr_noproc(transp);
1211                 return;
1212         }
1213 }
1214
1215 /*
1216  * Xdr conversion for a dirpath string
1217  */
1218 static int
1219 xdr_dir(XDR *xdrsp, char *dirp)
1220 {
1221         return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
1222 }
1223
1224 /*
1225  * Xdr routine to generate file handle reply
1226  */
1227 static int
1228 xdr_fhs(XDR *xdrsp, caddr_t cp)
1229 {
1230         struct fhreturn *fhrp = (struct fhreturn *)cp;
1231         u_long ok = 0, len, auth;
1232         int i;
1233
1234         if (!xdr_long(xdrsp, &ok))
1235                 return (0);
1236         switch (fhrp->fhr_vers) {
1237         case 1:
1238                 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH));
1239         case 3:
1240                 len = NFSX_V3FH;
1241                 if (!xdr_long(xdrsp, &len))
1242                         return (0);
1243                 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len))
1244                         return (0);
1245                 if (fhrp->fhr_numsecflavors) {
1246                         if (!xdr_int(xdrsp, &fhrp->fhr_numsecflavors))
1247                                 return (0);
1248                         for (i = 0; i < fhrp->fhr_numsecflavors; i++)
1249                                 if (!xdr_int(xdrsp, &fhrp->fhr_secflavors[i]))
1250                                         return (0);
1251                         return (1);
1252                 } else {
1253                         auth = AUTH_SYS;
1254                         len = 1;
1255                         if (!xdr_long(xdrsp, &len))
1256                                 return (0);
1257                         return (xdr_long(xdrsp, &auth));
1258                 }
1259         }
1260         return (0);
1261 }
1262
1263 static int
1264 xdr_mlist(XDR *xdrsp, caddr_t cp __unused)
1265 {
1266         struct mountlist *mlp;
1267         int true = 1;
1268         int false = 0;
1269         char *strp;
1270
1271         SLIST_FOREACH(mlp, &mlhead, next) {
1272                 if (!xdr_bool(xdrsp, &true))
1273                         return (0);
1274                 strp = &mlp->ml_host[0];
1275                 if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
1276                         return (0);
1277                 strp = &mlp->ml_dirp[0];
1278                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1279                         return (0);
1280         }
1281         if (!xdr_bool(xdrsp, &false))
1282                 return (0);
1283         return (1);
1284 }
1285
1286 /*
1287  * Xdr conversion for export list
1288  */
1289 static int
1290 xdr_explist_common(XDR *xdrsp, caddr_t cp __unused, int brief)
1291 {
1292         struct exportlist *ep;
1293         int false = 0;
1294         int putdef;
1295         sigset_t sighup_mask;
1296
1297         sigemptyset(&sighup_mask);
1298         sigaddset(&sighup_mask, SIGHUP);
1299         sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
1300
1301         SLIST_FOREACH(ep, &exphead, entries) {
1302                 putdef = 0;
1303                 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir,
1304                                &putdef, brief))
1305                         goto errout;
1306                 if (ep->ex_defdir && putdef == 0 &&
1307                         put_exlist(ep->ex_defdir, xdrsp, (struct dirlist *)NULL,
1308                         &putdef, brief))
1309                         goto errout;
1310         }
1311         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1312         if (!xdr_bool(xdrsp, &false))
1313                 return (0);
1314         return (1);
1315 errout:
1316         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1317         return (0);
1318 }
1319
1320 /*
1321  * Called from xdr_explist() to traverse the tree and export the
1322  * directory paths.
1323  */
1324 static int
1325 put_exlist(struct dirlist *dp, XDR *xdrsp, struct dirlist *adp, int *putdefp,
1326         int brief)
1327 {
1328         struct grouplist *grp;
1329         struct hostlist *hp;
1330         int true = 1;
1331         int false = 0;
1332         int gotalldir = 0;
1333         char *strp;
1334
1335         if (dp) {
1336                 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp, brief))
1337                         return (1);
1338                 if (!xdr_bool(xdrsp, &true))
1339                         return (1);
1340                 strp = dp->dp_dirp;
1341                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1342                         return (1);
1343                 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) {
1344                         gotalldir = 1;
1345                         *putdefp = 1;
1346                 }
1347                 if (brief) {
1348                         if (!xdr_bool(xdrsp, &true))
1349                                 return (1);
1350                         strp = "(...)";
1351                         if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1352                                 return (1);
1353                 } else if ((dp->dp_flag & DP_DEFSET) == 0 &&
1354                     (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) {
1355                         hp = dp->dp_hosts;
1356                         while (hp) {
1357                                 grp = hp->ht_grp;
1358                                 if (grp->gr_type == GT_HOST) {
1359                                         if (!xdr_bool(xdrsp, &true))
1360                                                 return (1);
1361                                         strp = grp->gr_ptr.gt_addrinfo->ai_canonname;
1362                                         if (!xdr_string(xdrsp, &strp,
1363                                             MNTNAMLEN))
1364                                                 return (1);
1365                                 } else if (grp->gr_type == GT_NET) {
1366                                         if (!xdr_bool(xdrsp, &true))
1367                                                 return (1);
1368                                         strp = grp->gr_ptr.gt_net.nt_name;
1369                                         if (!xdr_string(xdrsp, &strp,
1370                                             MNTNAMLEN))
1371                                                 return (1);
1372                                 }
1373                                 hp = hp->ht_next;
1374                                 if (gotalldir && hp == (struct hostlist *)NULL) {
1375                                         hp = adp->dp_hosts;
1376                                         gotalldir = 0;
1377                                 }
1378                         }
1379                 }
1380                 if (!xdr_bool(xdrsp, &false))
1381                         return (1);
1382                 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp, brief))
1383                         return (1);
1384         }
1385         return (0);
1386 }
1387
1388 static int
1389 xdr_explist(XDR *xdrsp, caddr_t cp)
1390 {
1391
1392         return xdr_explist_common(xdrsp, cp, 0);
1393 }
1394
1395 static int
1396 xdr_explist_brief(XDR *xdrsp, caddr_t cp)
1397 {
1398
1399         return xdr_explist_common(xdrsp, cp, 1);
1400 }
1401
1402 static char *line;
1403 static size_t linesize;
1404 static FILE *exp_file;
1405
1406 /*
1407  * Get the export list from one, currently open file
1408  */
1409 static void
1410 get_exportlist_one(void)
1411 {
1412         struct exportlist *ep;
1413         struct grouplist *grp, *tgrp;
1414         struct dirlist *dirhead;
1415         struct statfs fsb;
1416         struct xucred anon;
1417         char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc;
1418         int len, has_host, exflags, got_nondir, dirplen, netgrp;
1419
1420         v4root_phase = 0;
1421         dirhead = (struct dirlist *)NULL;
1422         while (get_line()) {
1423                 if (debug)
1424                         warnx("got line %s", line);
1425                 cp = line;
1426                 nextfield(&cp, &endcp);
1427                 if (*cp == '#')
1428                         goto nextline;
1429
1430                 /*
1431                  * Set defaults.
1432                  */
1433                 has_host = FALSE;
1434                 anon = def_anon;
1435                 exflags = MNT_EXPORTED;
1436                 got_nondir = 0;
1437                 opt_flags = 0;
1438                 ep = (struct exportlist *)NULL;
1439                 dirp = NULL;
1440
1441                 /*
1442                  * Handle the V4 root dir.
1443                  */
1444                 if (*cp == 'V' && *(cp + 1) == '4' && *(cp + 2) == ':') {
1445                         /*
1446                          * V4: just indicates that it is the v4 root point,
1447                          * so skip over that and set v4root_phase.
1448                          */
1449                         if (v4root_phase > 0) {
1450                                 syslog(LOG_ERR, "V4:duplicate line, ignored");
1451                                 goto nextline;
1452                         }
1453                         v4root_phase = 1;
1454                         cp += 3;
1455                         nextfield(&cp, &endcp);
1456                 }
1457
1458                 /*
1459                  * Create new exports list entry
1460                  */
1461                 len = endcp-cp;
1462                 tgrp = grp = get_grp();
1463                 while (len > 0) {
1464                         if (len > MNTNAMLEN) {
1465                             getexp_err(ep, tgrp, "mountpoint too long");
1466                             goto nextline;
1467                         }
1468                         if (*cp == '-') {
1469                             if (ep == (struct exportlist *)NULL) {
1470                                 getexp_err(ep, tgrp,
1471                                     "flag before export path definition");
1472                                 goto nextline;
1473                             }
1474                             if (debug)
1475                                 warnx("doing opt %s", cp);
1476                             got_nondir = 1;
1477                             if (do_opt(&cp, &endcp, ep, grp, &has_host,
1478                                 &exflags, &anon)) {
1479                                 getexp_err(ep, tgrp, NULL);
1480                                 goto nextline;
1481                             }
1482                         } else if (*cp == '/') {
1483                             savedc = *endcp;
1484                             *endcp = '\0';
1485                             if (v4root_phase > 1) {
1486                                     if (dirp != NULL) {
1487                                         getexp_err(ep, tgrp, "Multiple V4 dirs");
1488                                         goto nextline;
1489                                     }
1490                             }
1491                             if (check_dirpath(cp) &&
1492                                 statfs(cp, &fsb) >= 0) {
1493                                 if ((fsb.f_flags & MNT_AUTOMOUNTED) != 0)
1494                                     syslog(LOG_ERR, "Warning: exporting of "
1495                                         "automounted fs %s not supported", cp);
1496                                 if (got_nondir) {
1497                                     getexp_err(ep, tgrp, "dirs must be first");
1498                                     goto nextline;
1499                                 }
1500                                 if (v4root_phase == 1) {
1501                                     if (dirp != NULL) {
1502                                         getexp_err(ep, tgrp, "Multiple V4 dirs");
1503                                         goto nextline;
1504                                     }
1505                                     if (strlen(v4root_dirpath) == 0) {
1506                                         strlcpy(v4root_dirpath, cp,
1507                                             sizeof (v4root_dirpath));
1508                                     } else if (strcmp(v4root_dirpath, cp)
1509                                         != 0) {
1510                                         syslog(LOG_ERR,
1511                                             "different V4 dirpath %s", cp);
1512                                         getexp_err(ep, tgrp, NULL);
1513                                         goto nextline;
1514                                     }
1515                                     dirp = cp;
1516                                     v4root_phase = 2;
1517                                     got_nondir = 1;
1518                                     ep = get_exp();
1519                                 } else {
1520                                     if (ep) {
1521                                         if (ep->ex_fs.val[0] !=
1522                                             fsb.f_fsid.val[0] ||
1523                                             ep->ex_fs.val[1] !=
1524                                             fsb.f_fsid.val[1]) {
1525                                                 getexp_err(ep, tgrp,
1526                                                     "fsid mismatch");
1527                                                 goto nextline;
1528                                         }
1529                                     } else {
1530                                         /*
1531                                          * See if this directory is already
1532                                          * in the list.
1533                                          */
1534                                         ep = ex_search(&fsb.f_fsid);
1535                                         if (ep == (struct exportlist *)NULL) {
1536                                             ep = get_exp();
1537                                             ep->ex_fs = fsb.f_fsid;
1538                                             ep->ex_fsdir = strdup(fsb.f_mntonname);
1539                                             if (ep->ex_fsdir == NULL)
1540                                                 out_of_mem();
1541                                             if (debug)
1542                                                 warnx(
1543                                                   "making new ep fs=0x%x,0x%x",
1544                                                   fsb.f_fsid.val[0],
1545                                                   fsb.f_fsid.val[1]);
1546                                         } else if (debug)
1547                                             warnx("found ep fs=0x%x,0x%x",
1548                                                 fsb.f_fsid.val[0],
1549                                                 fsb.f_fsid.val[1]);
1550                                     }
1551
1552                                     /*
1553                                      * Add dirpath to export mount point.
1554                                      */
1555                                     dirp = add_expdir(&dirhead, cp, len);
1556                                     dirplen = len;
1557                                 }
1558                             } else {
1559                                 getexp_err(ep, tgrp,
1560                                     "symbolic link in export path or statfs failed");
1561                                 goto nextline;
1562                             }
1563                             *endcp = savedc;
1564                         } else {
1565                             savedc = *endcp;
1566                             *endcp = '\0';
1567                             got_nondir = 1;
1568                             if (ep == (struct exportlist *)NULL) {
1569                                 getexp_err(ep, tgrp,
1570                                     "host(s) before export path definition");
1571                                 goto nextline;
1572                             }
1573
1574                             /*
1575                              * Get the host or netgroup.
1576                              */
1577                             setnetgrent(cp);
1578                             netgrp = getnetgrent(&hst, &usr, &dom);
1579                             do {
1580                                 if (has_host) {
1581                                     grp->gr_next = get_grp();
1582                                     grp = grp->gr_next;
1583                                 }
1584                                 if (netgrp) {
1585                                     if (hst == 0) {
1586                                         syslog(LOG_ERR,
1587                                 "null hostname in netgroup %s, skipping", cp);
1588                                         grp->gr_type = GT_IGNORE;
1589                                     } else if (get_host(hst, grp, tgrp)) {
1590                                         syslog(LOG_ERR,
1591                         "bad host %s in netgroup %s, skipping", hst, cp);
1592                                         grp->gr_type = GT_IGNORE;
1593                                     }
1594                                 } else if (get_host(cp, grp, tgrp)) {
1595                                     syslog(LOG_ERR, "bad host %s, skipping", cp);
1596                                     grp->gr_type = GT_IGNORE;
1597                                 }
1598                                 has_host = TRUE;
1599                             } while (netgrp && getnetgrent(&hst, &usr, &dom));
1600                             endnetgrent();
1601                             *endcp = savedc;
1602                         }
1603                         cp = endcp;
1604                         nextfield(&cp, &endcp);
1605                         len = endcp - cp;
1606                 }
1607                 if (check_options(dirhead)) {
1608                         getexp_err(ep, tgrp, NULL);
1609                         goto nextline;
1610                 }
1611                 if (!has_host) {
1612                         grp->gr_type = GT_DEFAULT;
1613                         if (debug)
1614                                 warnx("adding a default entry");
1615
1616                 /*
1617                  * Don't allow a network export coincide with a list of
1618                  * host(s) on the same line.
1619                  */
1620                 } else if ((opt_flags & OP_NET) && tgrp->gr_next) {
1621                         getexp_err(ep, tgrp, "network/host conflict");
1622                         goto nextline;
1623
1624                 /*
1625                  * If an export list was specified on this line, make sure
1626                  * that we have at least one valid entry, otherwise skip it.
1627                  */
1628                 } else {
1629                         grp = tgrp;
1630                         while (grp && grp->gr_type == GT_IGNORE)
1631                                 grp = grp->gr_next;
1632                         if (! grp) {
1633                             getexp_err(ep, tgrp, "no valid entries");
1634                             goto nextline;
1635                         }
1636                 }
1637
1638                 if (v4root_phase == 1) {
1639                         getexp_err(ep, tgrp, "V4:root, no dirp, ignored");
1640                         goto nextline;
1641                 }
1642
1643                 /*
1644                  * Loop through hosts, pushing the exports into the kernel.
1645                  * After loop, tgrp points to the start of the list and
1646                  * grp points to the last entry in the list.
1647                  */
1648                 grp = tgrp;
1649                 do {
1650                         if (do_mount(ep, grp, exflags, &anon, dirp, dirplen,
1651                             &fsb)) {
1652                                 getexp_err(ep, tgrp, NULL);
1653                                 goto nextline;
1654                         }
1655                 } while (grp->gr_next && (grp = grp->gr_next));
1656
1657                 /*
1658                  * For V4: don't enter in mount lists.
1659                  */
1660                 if (v4root_phase > 0 && v4root_phase <= 2) {
1661                         /*
1662                          * Since these structures aren't used by mountd,
1663                          * free them up now.
1664                          */
1665                         if (ep != NULL)
1666                                 free_exp(ep);
1667                         while (tgrp != NULL) {
1668                                 grp = tgrp;
1669                                 tgrp = tgrp->gr_next;
1670                                 free_grp(grp);
1671                         }
1672                         goto nextline;
1673                 }
1674
1675                 /*
1676                  * Success. Update the data structures.
1677                  */
1678                 if (has_host) {
1679                         hang_dirp(dirhead, tgrp, ep, opt_flags);
1680                         grp->gr_next = grphead;
1681                         grphead = tgrp;
1682                 } else {
1683                         hang_dirp(dirhead, (struct grouplist *)NULL, ep,
1684                                 opt_flags);
1685                         free_grp(grp);
1686                 }
1687                 dirhead = (struct dirlist *)NULL;
1688                 if ((ep->ex_flag & EX_LINKED) == 0) {
1689                         SLIST_INSERT_HEAD(&exphead, ep, entries);
1690
1691                         ep->ex_flag |= EX_LINKED;
1692                 }
1693 nextline:
1694                 v4root_phase = 0;
1695                 if (dirhead) {
1696                         free_dir(dirhead);
1697                         dirhead = (struct dirlist *)NULL;
1698                 }
1699         }
1700 }
1701
1702 /*
1703  * Get the export list from all specified files
1704  */
1705 static void
1706 get_exportlist(void)
1707 {
1708         struct exportlist *ep, *ep2;
1709         struct grouplist *grp, *tgrp;
1710         struct export_args export;
1711         struct iovec *iov;
1712         struct statfs *fsp, *mntbufp;
1713         struct xvfsconf vfc;
1714         char errmsg[255];
1715         int num, i;
1716         int iovlen;
1717         int done;
1718         struct nfsex_args eargs;
1719
1720         if (suspend_nfsd != 0)
1721                 (void)nfssvc(NFSSVC_SUSPENDNFSD, NULL);
1722         v4root_dirpath[0] = '\0';
1723         bzero(&export, sizeof(export));
1724         export.ex_flags = MNT_DELEXPORT;
1725         iov = NULL;
1726         iovlen = 0;
1727         bzero(errmsg, sizeof(errmsg));
1728
1729         /*
1730          * First, get rid of the old list
1731          */
1732         SLIST_FOREACH_SAFE(ep, &exphead, entries, ep2) {
1733                 SLIST_REMOVE(&exphead, ep, exportlist, entries);
1734                 free_exp(ep);
1735         }
1736
1737         grp = grphead;
1738         while (grp) {
1739                 tgrp = grp;
1740                 grp = grp->gr_next;
1741                 free_grp(tgrp);
1742         }
1743         grphead = (struct grouplist *)NULL;
1744
1745         /*
1746          * and the old V4 root dir.
1747          */
1748         bzero(&eargs, sizeof (eargs));
1749         eargs.export.ex_flags = MNT_DELEXPORT;
1750         if (nfssvc(NFSSVC_V4ROOTEXPORT, (caddr_t)&eargs) < 0 &&
1751             errno != ENOENT)
1752                 syslog(LOG_ERR, "Can't delete exports for V4:");
1753
1754         /*
1755          * and clear flag that notes if a public fh has been exported.
1756          */
1757         has_publicfh = 0;
1758
1759         /*
1760          * And delete exports that are in the kernel for all local
1761          * filesystems.
1762          * XXX: Should know how to handle all local exportable filesystems.
1763          */
1764         num = getmntinfo(&mntbufp, MNT_NOWAIT);
1765
1766         if (num > 0) {
1767                 build_iovec(&iov, &iovlen, "fstype", NULL, 0);
1768                 build_iovec(&iov, &iovlen, "fspath", NULL, 0);
1769                 build_iovec(&iov, &iovlen, "from", NULL, 0);
1770                 build_iovec(&iov, &iovlen, "update", NULL, 0);
1771                 build_iovec(&iov, &iovlen, "export", &export, sizeof(export));
1772                 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
1773         }
1774
1775         for (i = 0; i < num; i++) {
1776                 fsp = &mntbufp[i];
1777                 if (getvfsbyname(fsp->f_fstypename, &vfc) != 0) {
1778                         syslog(LOG_ERR, "getvfsbyname() failed for %s",
1779                             fsp->f_fstypename);
1780                         continue;
1781                 }
1782
1783                 /*
1784                  * We do not need to delete "export" flag from
1785                  * filesystems that do not have it set.
1786                  */
1787                 if (!(fsp->f_flags & MNT_EXPORTED))
1788                     continue;
1789                 /*
1790                  * Do not delete export for network filesystem by
1791                  * passing "export" arg to nmount().
1792                  * It only makes sense to do this for local filesystems.
1793                  */
1794                 if (vfc.vfc_flags & VFCF_NETWORK)
1795                         continue;
1796
1797                 iov[1].iov_base = fsp->f_fstypename;
1798                 iov[1].iov_len = strlen(fsp->f_fstypename) + 1;
1799                 iov[3].iov_base = fsp->f_mntonname;
1800                 iov[3].iov_len = strlen(fsp->f_mntonname) + 1;
1801                 iov[5].iov_base = fsp->f_mntfromname;
1802                 iov[5].iov_len = strlen(fsp->f_mntfromname) + 1;
1803                 errmsg[0] = '\0';
1804
1805                 /*
1806                  * EXDEV is returned when path exists but is not a
1807                  * mount point.  May happens if raced with unmount.
1808                  */
1809                 if (nmount(iov, iovlen, fsp->f_flags) < 0 &&
1810                     errno != ENOENT && errno != ENOTSUP && errno != EXDEV) {
1811                         syslog(LOG_ERR,
1812                             "can't delete exports for %s: %m %s",
1813                             fsp->f_mntonname, errmsg);
1814                 }
1815         }
1816
1817         if (iov != NULL) {
1818                 /* Free strings allocated by strdup() in getmntopts.c */
1819                 free(iov[0].iov_base); /* fstype */
1820                 free(iov[2].iov_base); /* fspath */
1821                 free(iov[4].iov_base); /* from */
1822                 free(iov[6].iov_base); /* update */
1823                 free(iov[8].iov_base); /* export */
1824                 free(iov[10].iov_base); /* errmsg */
1825
1826                 /* free iov, allocated by realloc() */
1827                 free(iov);
1828                 iovlen = 0;
1829         }
1830
1831         /*
1832          * Read in the exports file and build the list, calling
1833          * nmount() as we go along to push the export rules into the kernel.
1834          */
1835         done = 0;
1836         for (i = 0; exnames[i] != NULL; i++) {
1837                 if (debug)
1838                         warnx("reading exports from %s", exnames[i]);
1839                 if ((exp_file = fopen(exnames[i], "r")) == NULL) {
1840                         syslog(LOG_WARNING, "can't open %s", exnames[i]);
1841                         continue;
1842                 }
1843                 get_exportlist_one();
1844                 fclose(exp_file);
1845                 done++;
1846         }
1847         if (done == 0) {
1848                 syslog(LOG_ERR, "can't open any exports file");
1849                 exit(2);
1850         }
1851
1852         /*
1853          * If there was no public fh, clear any previous one set.
1854          */
1855         if (has_publicfh == 0)
1856                 (void) nfssvc(NFSSVC_NOPUBLICFH, NULL);
1857
1858         /* Resume the nfsd. If they weren't suspended, this is harmless. */
1859         (void)nfssvc(NFSSVC_RESUMENFSD, NULL);
1860 }
1861
1862 /*
1863  * Allocate an export list element
1864  */
1865 static struct exportlist *
1866 get_exp(void)
1867 {
1868         struct exportlist *ep;
1869
1870         ep = (struct exportlist *)calloc(1, sizeof (struct exportlist));
1871         if (ep == (struct exportlist *)NULL)
1872                 out_of_mem();
1873         return (ep);
1874 }
1875
1876 /*
1877  * Allocate a group list element
1878  */
1879 static struct grouplist *
1880 get_grp(void)
1881 {
1882         struct grouplist *gp;
1883
1884         gp = (struct grouplist *)calloc(1, sizeof (struct grouplist));
1885         if (gp == (struct grouplist *)NULL)
1886                 out_of_mem();
1887         return (gp);
1888 }
1889
1890 /*
1891  * Clean up upon an error in get_exportlist().
1892  */
1893 static void
1894 getexp_err(struct exportlist *ep, struct grouplist *grp, const char *reason)
1895 {
1896         struct grouplist *tgrp;
1897
1898         if (!(opt_flags & OP_QUIET)) {
1899                 if (reason != NULL)
1900                         syslog(LOG_ERR, "bad exports list line '%s': %s", line,
1901                             reason);
1902                 else
1903                         syslog(LOG_ERR, "bad exports list line '%s'", line);
1904         }
1905         if (ep && (ep->ex_flag & EX_LINKED) == 0)
1906                 free_exp(ep);
1907         while (grp) {
1908                 tgrp = grp;
1909                 grp = grp->gr_next;
1910                 free_grp(tgrp);
1911         }
1912 }
1913
1914 /*
1915  * Search the export list for a matching fs.
1916  */
1917 static struct exportlist *
1918 ex_search(fsid_t *fsid)
1919 {
1920         struct exportlist *ep;
1921
1922         SLIST_FOREACH(ep, &exphead, entries) {
1923                 if (ep->ex_fs.val[0] == fsid->val[0] &&
1924                     ep->ex_fs.val[1] == fsid->val[1])
1925                         return (ep);
1926         }
1927
1928         return (ep);
1929 }
1930
1931 /*
1932  * Add a directory path to the list.
1933  */
1934 static char *
1935 add_expdir(struct dirlist **dpp, char *cp, int len)
1936 {
1937         struct dirlist *dp;
1938
1939         dp = malloc(sizeof (struct dirlist));
1940         if (dp == (struct dirlist *)NULL)
1941                 out_of_mem();
1942         dp->dp_left = *dpp;
1943         dp->dp_right = (struct dirlist *)NULL;
1944         dp->dp_flag = 0;
1945         dp->dp_hosts = (struct hostlist *)NULL;
1946         dp->dp_dirp = strndup(cp, len);
1947         if (dp->dp_dirp == NULL)
1948                 out_of_mem();
1949         *dpp = dp;
1950         return (dp->dp_dirp);
1951 }
1952
1953 /*
1954  * Hang the dir list element off the dirpath binary tree as required
1955  * and update the entry for host.
1956  */
1957 static void
1958 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep,
1959         int flags)
1960 {
1961         struct hostlist *hp;
1962         struct dirlist *dp2;
1963
1964         if (flags & OP_ALLDIRS) {
1965                 if (ep->ex_defdir)
1966                         free((caddr_t)dp);
1967                 else
1968                         ep->ex_defdir = dp;
1969                 if (grp == (struct grouplist *)NULL) {
1970                         ep->ex_defdir->dp_flag |= DP_DEFSET;
1971                         /* Save the default security flavors list. */
1972                         ep->ex_defnumsecflavors = ep->ex_numsecflavors;
1973                         if (ep->ex_numsecflavors > 0)
1974                                 memcpy(ep->ex_defsecflavors, ep->ex_secflavors,
1975                                     sizeof(ep->ex_secflavors));
1976                 } else while (grp) {
1977                         hp = get_ht();
1978                         hp->ht_grp = grp;
1979                         hp->ht_next = ep->ex_defdir->dp_hosts;
1980                         ep->ex_defdir->dp_hosts = hp;
1981                         /* Save the security flavors list for this host set. */
1982                         grp->gr_numsecflavors = ep->ex_numsecflavors;
1983                         if (ep->ex_numsecflavors > 0)
1984                                 memcpy(grp->gr_secflavors, ep->ex_secflavors,
1985                                     sizeof(ep->ex_secflavors));
1986                         grp = grp->gr_next;
1987                 }
1988         } else {
1989
1990                 /*
1991                  * Loop through the directories adding them to the tree.
1992                  */
1993                 while (dp) {
1994                         dp2 = dp->dp_left;
1995                         add_dlist(&ep->ex_dirl, dp, grp, flags, ep);
1996                         dp = dp2;
1997                 }
1998         }
1999 }
2000
2001 /*
2002  * Traverse the binary tree either updating a node that is already there
2003  * for the new directory or adding the new node.
2004  */
2005 static void
2006 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp,
2007         int flags, struct exportlist *ep)
2008 {
2009         struct dirlist *dp;
2010         struct hostlist *hp;
2011         int cmp;
2012
2013         dp = *dpp;
2014         if (dp) {
2015                 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp);
2016                 if (cmp > 0) {
2017                         add_dlist(&dp->dp_left, newdp, grp, flags, ep);
2018                         return;
2019                 } else if (cmp < 0) {
2020                         add_dlist(&dp->dp_right, newdp, grp, flags, ep);
2021                         return;
2022                 } else
2023                         free((caddr_t)newdp);
2024         } else {
2025                 dp = newdp;
2026                 dp->dp_left = (struct dirlist *)NULL;
2027                 *dpp = dp;
2028         }
2029         if (grp) {
2030
2031                 /*
2032                  * Hang all of the host(s) off of the directory point.
2033                  */
2034                 do {
2035                         hp = get_ht();
2036                         hp->ht_grp = grp;
2037                         hp->ht_next = dp->dp_hosts;
2038                         dp->dp_hosts = hp;
2039                         /* Save the security flavors list for this host set. */
2040                         grp->gr_numsecflavors = ep->ex_numsecflavors;
2041                         if (ep->ex_numsecflavors > 0)
2042                                 memcpy(grp->gr_secflavors, ep->ex_secflavors,
2043                                     sizeof(ep->ex_secflavors));
2044                         grp = grp->gr_next;
2045                 } while (grp);
2046         } else {
2047                 dp->dp_flag |= DP_DEFSET;
2048                 /* Save the default security flavors list. */
2049                 ep->ex_defnumsecflavors = ep->ex_numsecflavors;
2050                 if (ep->ex_numsecflavors > 0)
2051                         memcpy(ep->ex_defsecflavors, ep->ex_secflavors,
2052                             sizeof(ep->ex_secflavors));
2053         }
2054 }
2055
2056 /*
2057  * Search for a dirpath on the export point.
2058  */
2059 static struct dirlist *
2060 dirp_search(struct dirlist *dp, char *dirp)
2061 {
2062         int cmp;
2063
2064         if (dp) {
2065                 cmp = strcmp(dp->dp_dirp, dirp);
2066                 if (cmp > 0)
2067                         return (dirp_search(dp->dp_left, dirp));
2068                 else if (cmp < 0)
2069                         return (dirp_search(dp->dp_right, dirp));
2070                 else
2071                         return (dp);
2072         }
2073         return (dp);
2074 }
2075
2076 /*
2077  * Scan for a host match in a directory tree.
2078  */
2079 static int
2080 chk_host(struct dirlist *dp, struct sockaddr *saddr, int *defsetp,
2081         int *hostsetp, int *numsecflavors, int **secflavorsp)
2082 {
2083         struct hostlist *hp;
2084         struct grouplist *grp;
2085         struct addrinfo *ai;
2086
2087         if (dp) {
2088                 if (dp->dp_flag & DP_DEFSET)
2089                         *defsetp = dp->dp_flag;
2090                 hp = dp->dp_hosts;
2091                 while (hp) {
2092                         grp = hp->ht_grp;
2093                         switch (grp->gr_type) {
2094                         case GT_HOST:
2095                                 ai = grp->gr_ptr.gt_addrinfo;
2096                                 for (; ai; ai = ai->ai_next) {
2097                                         if (!sacmp(ai->ai_addr, saddr, NULL)) {
2098                                                 *hostsetp =
2099                                                     (hp->ht_flag | DP_HOSTSET);
2100                                                 if (numsecflavors != NULL) {
2101                                                         *numsecflavors =
2102                                                             grp->gr_numsecflavors;
2103                                                         *secflavorsp =
2104                                                             grp->gr_secflavors;
2105                                                 }
2106                                                 return (1);
2107                                         }
2108                                 }
2109                                 break;
2110                         case GT_NET:
2111                                 if (!sacmp(saddr, (struct sockaddr *)
2112                                     &grp->gr_ptr.gt_net.nt_net,
2113                                     (struct sockaddr *)
2114                                     &grp->gr_ptr.gt_net.nt_mask)) {
2115                                         *hostsetp = (hp->ht_flag | DP_HOSTSET);
2116                                         if (numsecflavors != NULL) {
2117                                                 *numsecflavors =
2118                                                     grp->gr_numsecflavors;
2119                                                 *secflavorsp =
2120                                                     grp->gr_secflavors;
2121                                         }
2122                                         return (1);
2123                                 }
2124                                 break;
2125                         }
2126                         hp = hp->ht_next;
2127                 }
2128         }
2129         return (0);
2130 }
2131
2132 /*
2133  * Scan tree for a host that matches the address.
2134  */
2135 static int
2136 scan_tree(struct dirlist *dp, struct sockaddr *saddr)
2137 {
2138         int defset, hostset;
2139
2140         if (dp) {
2141                 if (scan_tree(dp->dp_left, saddr))
2142                         return (1);
2143                 if (chk_host(dp, saddr, &defset, &hostset, NULL, NULL))
2144                         return (1);
2145                 if (scan_tree(dp->dp_right, saddr))
2146                         return (1);
2147         }
2148         return (0);
2149 }
2150
2151 /*
2152  * Traverse the dirlist tree and free it up.
2153  */
2154 static void
2155 free_dir(struct dirlist *dp)
2156 {
2157
2158         if (dp) {
2159                 free_dir(dp->dp_left);
2160                 free_dir(dp->dp_right);
2161                 free_host(dp->dp_hosts);
2162                 free(dp->dp_dirp);
2163                 free(dp);
2164         }
2165 }
2166
2167 /*
2168  * Parse a colon separated list of security flavors
2169  */
2170 static int
2171 parsesec(char *seclist, struct exportlist *ep)
2172 {
2173         char *cp, savedc;
2174         int flavor;
2175
2176         ep->ex_numsecflavors = 0;
2177         for (;;) {
2178                 cp = strchr(seclist, ':');
2179                 if (cp) {
2180                         savedc = *cp;
2181                         *cp = '\0';
2182                 }
2183
2184                 if (!strcmp(seclist, "sys"))
2185                         flavor = AUTH_SYS;
2186                 else if (!strcmp(seclist, "krb5"))
2187                         flavor = RPCSEC_GSS_KRB5;
2188                 else if (!strcmp(seclist, "krb5i"))
2189                         flavor = RPCSEC_GSS_KRB5I;
2190                 else if (!strcmp(seclist, "krb5p"))
2191                         flavor = RPCSEC_GSS_KRB5P;
2192                 else {
2193                         if (cp)
2194                                 *cp = savedc;
2195                         syslog(LOG_ERR, "bad sec flavor: %s", seclist);
2196                         return (1);
2197                 }
2198                 if (ep->ex_numsecflavors == MAXSECFLAVORS) {
2199                         if (cp)
2200                                 *cp = savedc;
2201                         syslog(LOG_ERR, "too many sec flavors: %s", seclist);
2202                         return (1);
2203                 }
2204                 ep->ex_secflavors[ep->ex_numsecflavors] = flavor;
2205                 ep->ex_numsecflavors++;
2206                 if (cp) {
2207                         *cp = savedc;
2208                         seclist = cp + 1;
2209                 } else {
2210                         break;
2211                 }
2212         }
2213         return (0);
2214 }
2215
2216 /*
2217  * Parse the option string and update fields.
2218  * Option arguments may either be -<option>=<value> or
2219  * -<option> <value>
2220  */
2221 static int
2222 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp,
2223         int *has_hostp, int *exflagsp, struct xucred *cr)
2224 {
2225         char *cpoptarg, *cpoptend;
2226         char *cp, *endcp, *cpopt, savedc, savedc2;
2227         int allflag, usedarg;
2228
2229         savedc2 = '\0';
2230         cpopt = *cpp;
2231         cpopt++;
2232         cp = *endcpp;
2233         savedc = *cp;
2234         *cp = '\0';
2235         while (cpopt && *cpopt) {
2236                 allflag = 1;
2237                 usedarg = -2;
2238                 if ((cpoptend = strchr(cpopt, ','))) {
2239                         *cpoptend++ = '\0';
2240                         if ((cpoptarg = strchr(cpopt, '=')))
2241                                 *cpoptarg++ = '\0';
2242                 } else {
2243                         if ((cpoptarg = strchr(cpopt, '=')))
2244                                 *cpoptarg++ = '\0';
2245                         else {
2246                                 *cp = savedc;
2247                                 nextfield(&cp, &endcp);
2248                                 **endcpp = '\0';
2249                                 if (endcp > cp && *cp != '-') {
2250                                         cpoptarg = cp;
2251                                         savedc2 = *endcp;
2252                                         *endcp = '\0';
2253                                         usedarg = 0;
2254                                 }
2255                         }
2256                 }
2257                 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) {
2258                         *exflagsp |= MNT_EXRDONLY;
2259                 } else if (cpoptarg && (!strcmp(cpopt, "maproot") ||
2260                     !(allflag = strcmp(cpopt, "mapall")) ||
2261                     !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) {
2262                         usedarg++;
2263                         parsecred(cpoptarg, cr);
2264                         if (allflag == 0) {
2265                                 *exflagsp |= MNT_EXPORTANON;
2266                                 opt_flags |= OP_MAPALL;
2267                         } else
2268                                 opt_flags |= OP_MAPROOT;
2269                 } else if (cpoptarg && (!strcmp(cpopt, "mask") ||
2270                     !strcmp(cpopt, "m"))) {
2271                         if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) {
2272                                 syslog(LOG_ERR, "bad mask: %s", cpoptarg);
2273                                 return (1);
2274                         }
2275                         usedarg++;
2276                         opt_flags |= OP_MASK;
2277                 } else if (cpoptarg && (!strcmp(cpopt, "network") ||
2278                         !strcmp(cpopt, "n"))) {
2279                         if (strchr(cpoptarg, '/') != NULL) {
2280                                 if (debug)
2281                                         fprintf(stderr, "setting OP_MASKLEN\n");
2282                                 opt_flags |= OP_MASKLEN;
2283                         }
2284                         if (grp->gr_type != GT_NULL) {
2285                                 syslog(LOG_ERR, "network/host conflict");
2286                                 return (1);
2287                         } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) {
2288                                 syslog(LOG_ERR, "bad net: %s", cpoptarg);
2289                                 return (1);
2290                         }
2291                         grp->gr_type = GT_NET;
2292                         *has_hostp = 1;
2293                         usedarg++;
2294                         opt_flags |= OP_NET;
2295                 } else if (!strcmp(cpopt, "alldirs")) {
2296                         opt_flags |= OP_ALLDIRS;
2297                 } else if (!strcmp(cpopt, "public")) {
2298                         *exflagsp |= MNT_EXPUBLIC;
2299                 } else if (!strcmp(cpopt, "webnfs")) {
2300                         *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON);
2301                         opt_flags |= OP_MAPALL;
2302                 } else if (cpoptarg && !strcmp(cpopt, "index")) {
2303                         ep->ex_indexfile = strdup(cpoptarg);
2304                 } else if (!strcmp(cpopt, "quiet")) {
2305                         opt_flags |= OP_QUIET;
2306                 } else if (cpoptarg && !strcmp(cpopt, "sec")) {
2307                         if (parsesec(cpoptarg, ep))
2308                                 return (1);
2309                         opt_flags |= OP_SEC;
2310                         usedarg++;
2311                 } else {
2312                         syslog(LOG_ERR, "bad opt %s", cpopt);
2313                         return (1);
2314                 }
2315                 if (usedarg >= 0) {
2316                         *endcp = savedc2;
2317                         **endcpp = savedc;
2318                         if (usedarg > 0) {
2319                                 *cpp = cp;
2320                                 *endcpp = endcp;
2321                         }
2322                         return (0);
2323                 }
2324                 cpopt = cpoptend;
2325         }
2326         **endcpp = savedc;
2327         return (0);
2328 }
2329
2330 /*
2331  * Translate a character string to the corresponding list of network
2332  * addresses for a hostname.
2333  */
2334 static int
2335 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp)
2336 {
2337         struct grouplist *checkgrp;
2338         struct addrinfo *ai, *tai, hints;
2339         int ecode;
2340         char host[NI_MAXHOST];
2341
2342         if (grp->gr_type != GT_NULL) {
2343                 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp);
2344                 return (1);
2345         }
2346         memset(&hints, 0, sizeof hints);
2347         hints.ai_flags = AI_CANONNAME;
2348         hints.ai_protocol = IPPROTO_UDP;
2349         ecode = getaddrinfo(cp, NULL, &hints, &ai);
2350         if (ecode != 0) {
2351                 syslog(LOG_ERR,"can't get address info for host %s", cp);
2352                 return 1;
2353         }
2354         grp->gr_ptr.gt_addrinfo = ai;
2355         while (ai != NULL) {
2356                 if (ai->ai_canonname == NULL) {
2357                         if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host,
2358                             sizeof host, NULL, 0, NI_NUMERICHOST) != 0)
2359                                 strlcpy(host, "?", sizeof(host));
2360                         ai->ai_canonname = strdup(host);
2361                         ai->ai_flags |= AI_CANONNAME;
2362                 }
2363                 if (debug)
2364                         fprintf(stderr, "got host %s\n", ai->ai_canonname);
2365                 /*
2366                  * Sanity check: make sure we don't already have an entry
2367                  * for this host in the grouplist.
2368                  */
2369                 for (checkgrp = tgrp; checkgrp != NULL;
2370                     checkgrp = checkgrp->gr_next) {
2371                         if (checkgrp->gr_type != GT_HOST)
2372                                 continue;
2373                         for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL;
2374                             tai = tai->ai_next) {
2375                                 if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0)
2376                                         continue;
2377                                 if (debug)
2378                                         fprintf(stderr,
2379                                             "ignoring duplicate host %s\n",
2380                                             ai->ai_canonname);
2381                                 grp->gr_type = GT_IGNORE;
2382                                 return (0);
2383                         }
2384                 }
2385                 ai = ai->ai_next;
2386         }
2387         grp->gr_type = GT_HOST;
2388         return (0);
2389 }
2390
2391 /*
2392  * Free up an exports list component
2393  */
2394 static void
2395 free_exp(struct exportlist *ep)
2396 {
2397
2398         if (ep->ex_defdir) {
2399                 free_host(ep->ex_defdir->dp_hosts);
2400                 free((caddr_t)ep->ex_defdir);
2401         }
2402         if (ep->ex_fsdir)
2403                 free(ep->ex_fsdir);
2404         if (ep->ex_indexfile)
2405                 free(ep->ex_indexfile);
2406         free_dir(ep->ex_dirl);
2407         free((caddr_t)ep);
2408 }
2409
2410 /*
2411  * Free hosts.
2412  */
2413 static void
2414 free_host(struct hostlist *hp)
2415 {
2416         struct hostlist *hp2;
2417
2418         while (hp) {
2419                 hp2 = hp;
2420                 hp = hp->ht_next;
2421                 free((caddr_t)hp2);
2422         }
2423 }
2424
2425 static struct hostlist *
2426 get_ht(void)
2427 {
2428         struct hostlist *hp;
2429
2430         hp = (struct hostlist *)malloc(sizeof (struct hostlist));
2431         if (hp == (struct hostlist *)NULL)
2432                 out_of_mem();
2433         hp->ht_next = (struct hostlist *)NULL;
2434         hp->ht_flag = 0;
2435         return (hp);
2436 }
2437
2438 /*
2439  * Out of memory, fatal
2440  */
2441 static void
2442 out_of_mem(void)
2443 {
2444
2445         syslog(LOG_ERR, "out of memory");
2446         exit(2);
2447 }
2448
2449 /*
2450  * Do the nmount() syscall with the update flag to push the export info into
2451  * the kernel.
2452  */
2453 static int
2454 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags,
2455     struct xucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb)
2456 {
2457         struct statfs fsb1;
2458         struct addrinfo *ai;
2459         struct export_args *eap;
2460         char errmsg[255];
2461         char *cp;
2462         int done;
2463         char savedc;
2464         struct iovec *iov;
2465         int i, iovlen;
2466         int ret;
2467         struct nfsex_args nfsea;
2468
2469         eap = &nfsea.export;
2470
2471         cp = NULL;
2472         savedc = '\0';
2473         iov = NULL;
2474         iovlen = 0;
2475         ret = 0;
2476
2477         bzero(eap, sizeof (struct export_args));
2478         bzero(errmsg, sizeof(errmsg));
2479         eap->ex_flags = exflags;
2480         eap->ex_anon = *anoncrp;
2481         eap->ex_indexfile = ep->ex_indexfile;
2482         if (grp->gr_type == GT_HOST)
2483                 ai = grp->gr_ptr.gt_addrinfo;
2484         else
2485                 ai = NULL;
2486         eap->ex_numsecflavors = ep->ex_numsecflavors;
2487         for (i = 0; i < eap->ex_numsecflavors; i++)
2488                 eap->ex_secflavors[i] = ep->ex_secflavors[i];
2489         if (eap->ex_numsecflavors == 0) {
2490                 eap->ex_numsecflavors = 1;
2491                 eap->ex_secflavors[0] = AUTH_SYS;
2492         }
2493         done = FALSE;
2494
2495         if (v4root_phase == 0) {
2496                 build_iovec(&iov, &iovlen, "fstype", NULL, 0);
2497                 build_iovec(&iov, &iovlen, "fspath", NULL, 0);
2498                 build_iovec(&iov, &iovlen, "from", NULL, 0);
2499                 build_iovec(&iov, &iovlen, "update", NULL, 0);
2500                 build_iovec(&iov, &iovlen, "export", eap,
2501                     sizeof (struct export_args));
2502                 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
2503         }
2504
2505         while (!done) {
2506                 switch (grp->gr_type) {
2507                 case GT_HOST:
2508                         if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0)
2509                                 goto skip;
2510                         eap->ex_addr = ai->ai_addr;
2511                         eap->ex_addrlen = ai->ai_addrlen;
2512                         eap->ex_masklen = 0;
2513                         break;
2514                 case GT_NET:
2515                         if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 &&
2516                             have_v6 == 0)
2517                                 goto skip;
2518                         eap->ex_addr =
2519                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net;
2520                         eap->ex_addrlen =
2521                             ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_net)->sa_len;
2522                         eap->ex_mask =
2523                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask;
2524                         eap->ex_masklen = ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask)->sa_len;
2525                         break;
2526                 case GT_DEFAULT:
2527                         eap->ex_addr = NULL;
2528                         eap->ex_addrlen = 0;
2529                         eap->ex_mask = NULL;
2530                         eap->ex_masklen = 0;
2531                         break;
2532                 case GT_IGNORE:
2533                         ret = 0;
2534                         goto error_exit;
2535                         break;
2536                 default:
2537                         syslog(LOG_ERR, "bad grouptype");
2538                         if (cp)
2539                                 *cp = savedc;
2540                         ret = 1;
2541                         goto error_exit;
2542                 }
2543
2544                 /*
2545                  * For V4:, use the nfssvc() syscall, instead of mount().
2546                  */
2547                 if (v4root_phase == 2) {
2548                         nfsea.fspec = v4root_dirpath;
2549                         if (nfssvc(NFSSVC_V4ROOTEXPORT, (caddr_t)&nfsea) < 0) {
2550                                 syslog(LOG_ERR, "Exporting V4: failed");
2551                                 return (2);
2552                         }
2553                 } else {
2554                         /*
2555                          * XXX:
2556                          * Maybe I should just use the fsb->f_mntonname path
2557                          * instead of looping back up the dirp to the mount
2558                          * point??
2559                          * Also, needs to know how to export all types of local
2560                          * exportable filesystems and not just "ufs".
2561                          */
2562                         iov[1].iov_base = fsb->f_fstypename; /* "fstype" */
2563                         iov[1].iov_len = strlen(fsb->f_fstypename) + 1;
2564                         iov[3].iov_base = fsb->f_mntonname; /* "fspath" */
2565                         iov[3].iov_len = strlen(fsb->f_mntonname) + 1;
2566                         iov[5].iov_base = fsb->f_mntfromname; /* "from" */
2567                         iov[5].iov_len = strlen(fsb->f_mntfromname) + 1;
2568                         errmsg[0] = '\0';
2569
2570                         while (nmount(iov, iovlen, fsb->f_flags) < 0) {
2571                                 if (cp)
2572                                         *cp-- = savedc;
2573                                 else
2574                                         cp = dirp + dirplen - 1;
2575                                 if (opt_flags & OP_QUIET) {
2576                                         ret = 1;
2577                                         goto error_exit;
2578                                 }
2579                                 if (errno == EPERM) {
2580                                         if (debug)
2581                                                 warnx("can't change attributes for %s: %s",
2582                                                     dirp, errmsg);
2583                                         syslog(LOG_ERR,
2584                                            "can't change attributes for %s: %s",
2585                                             dirp, errmsg);
2586                                         ret = 1;
2587                                         goto error_exit;
2588                                 }
2589                                 if (opt_flags & OP_ALLDIRS) {
2590                                         if (errno == EINVAL)
2591                                                 syslog(LOG_ERR,
2592                 "-alldirs requested but %s is not a filesystem mountpoint",
2593                                                     dirp);
2594                                         else
2595                                                 syslog(LOG_ERR,
2596                                                     "could not remount %s: %m",
2597                                                     dirp);
2598                                         ret = 1;
2599                                         goto error_exit;
2600                                 }
2601                                 /* back up over the last component */
2602                                 while (*cp == '/' && cp > dirp)
2603                                         cp--;
2604                                 while (*(cp - 1) != '/' && cp > dirp)
2605                                         cp--;
2606                                 if (cp == dirp) {
2607                                         if (debug)
2608                                                 warnx("mnt unsucc");
2609                                         syslog(LOG_ERR, "can't export %s %s",
2610                                             dirp, errmsg);
2611                                         ret = 1;
2612                                         goto error_exit;
2613                                 }
2614                                 savedc = *cp;
2615                                 *cp = '\0';
2616                                 /*
2617                                  * Check that we're still on the same
2618                                  * filesystem.
2619                                  */
2620                                 if (statfs(dirp, &fsb1) != 0 ||
2621                                     bcmp(&fsb1.f_fsid, &fsb->f_fsid,
2622                                     sizeof (fsb1.f_fsid)) != 0) {
2623                                         *cp = savedc;
2624                                         syslog(LOG_ERR,
2625                                             "can't export %s %s", dirp,
2626                                             errmsg);
2627                                         ret = 1;
2628                                         goto error_exit;
2629                                 }
2630                         }
2631                 }
2632
2633                 /*
2634                  * For the experimental server:
2635                  * If this is the public directory, get the file handle
2636                  * and load it into the kernel via the nfssvc() syscall.
2637                  */
2638                 if ((exflags & MNT_EXPUBLIC) != 0) {
2639                         fhandle_t fh;
2640                         char *public_name;
2641
2642                         if (eap->ex_indexfile != NULL)
2643                                 public_name = eap->ex_indexfile;
2644                         else
2645                                 public_name = dirp;
2646                         if (getfh(public_name, &fh) < 0)
2647                                 syslog(LOG_ERR,
2648                                     "Can't get public fh for %s", public_name);
2649                         else if (nfssvc(NFSSVC_PUBLICFH, (caddr_t)&fh) < 0)
2650                                 syslog(LOG_ERR,
2651                                     "Can't set public fh for %s", public_name);
2652                         else
2653                                 has_publicfh = 1;
2654                 }
2655 skip:
2656                 if (ai != NULL)
2657                         ai = ai->ai_next;
2658                 if (ai == NULL)
2659                         done = TRUE;
2660         }
2661         if (cp)
2662                 *cp = savedc;
2663 error_exit:
2664         /* free strings allocated by strdup() in getmntopts.c */
2665         if (iov != NULL) {
2666                 free(iov[0].iov_base); /* fstype */
2667                 free(iov[2].iov_base); /* fspath */
2668                 free(iov[4].iov_base); /* from */
2669                 free(iov[6].iov_base); /* update */
2670                 free(iov[8].iov_base); /* export */
2671                 free(iov[10].iov_base); /* errmsg */
2672
2673                 /* free iov, allocated by realloc() */
2674                 free(iov);
2675         }
2676         return (ret);
2677 }
2678
2679 /*
2680  * Translate a net address.
2681  *
2682  * If `maskflg' is nonzero, then `cp' is a netmask, not a network address.
2683  */
2684 static int
2685 get_net(char *cp, struct netmsk *net, int maskflg)
2686 {
2687         struct netent *np = NULL;
2688         char *name, *p, *prefp;
2689         struct sockaddr_in sin;
2690         struct sockaddr *sa = NULL;
2691         struct addrinfo hints, *ai = NULL;
2692         char netname[NI_MAXHOST];
2693         long preflen;
2694
2695         p = prefp = NULL;
2696         if ((opt_flags & OP_MASKLEN) && !maskflg) {
2697                 p = strchr(cp, '/');
2698                 *p = '\0';
2699                 prefp = p + 1;
2700         }
2701
2702         /*
2703          * Check for a numeric address first. We wish to avoid
2704          * possible DNS lookups in getnetbyname().
2705          */
2706         if (isxdigit(*cp) || *cp == ':') {
2707                 memset(&hints, 0, sizeof hints);
2708                 /* Ensure the mask and the network have the same family. */
2709                 if (maskflg && (opt_flags & OP_NET))
2710                         hints.ai_family = net->nt_net.ss_family;
2711                 else if (!maskflg && (opt_flags & OP_HAVEMASK))
2712                         hints.ai_family = net->nt_mask.ss_family;
2713                 else
2714                         hints.ai_family = AF_UNSPEC;
2715                 hints.ai_flags = AI_NUMERICHOST;
2716                 if (getaddrinfo(cp, NULL, &hints, &ai) == 0)
2717                         sa = ai->ai_addr;
2718                 if (sa != NULL && ai->ai_family == AF_INET) {
2719                         /*
2720                          * The address in `cp' is really a network address, so
2721                          * use inet_network() to re-interpret this correctly.
2722                          * e.g. "127.1" means 127.1.0.0, not 127.0.0.1.
2723                          */
2724                         bzero(&sin, sizeof sin);
2725                         sin.sin_family = AF_INET;
2726                         sin.sin_len = sizeof sin;
2727                         sin.sin_addr = inet_makeaddr(inet_network(cp), 0);
2728                         if (debug)
2729                                 fprintf(stderr, "get_net: v4 addr %s\n",
2730                                     inet_ntoa(sin.sin_addr));
2731                         sa = (struct sockaddr *)&sin;
2732                 }
2733         }
2734         if (sa == NULL && (np = getnetbyname(cp)) != NULL) {
2735                 bzero(&sin, sizeof sin);
2736                 sin.sin_family = AF_INET;
2737                 sin.sin_len = sizeof sin;
2738                 sin.sin_addr = inet_makeaddr(np->n_net, 0);
2739                 sa = (struct sockaddr *)&sin;
2740         }
2741         if (sa == NULL)
2742                 goto fail;
2743
2744         if (maskflg) {
2745                 /* The specified sockaddr is a mask. */
2746                 if (checkmask(sa) != 0)
2747                         goto fail;
2748                 bcopy(sa, &net->nt_mask, sa->sa_len);
2749                 opt_flags |= OP_HAVEMASK;
2750         } else {
2751                 /* The specified sockaddr is a network address. */
2752                 bcopy(sa, &net->nt_net, sa->sa_len);
2753
2754                 /* Get a network name for the export list. */
2755                 if (np) {
2756                         name = np->n_name;
2757                 } else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname,
2758                    NULL, 0, NI_NUMERICHOST) == 0) {
2759                         name = netname;
2760                 } else {
2761                         goto fail;
2762                 }
2763                 if ((net->nt_name = strdup(name)) == NULL)
2764                         out_of_mem();
2765
2766                 /*
2767                  * Extract a mask from either a "/<masklen>" suffix, or
2768                  * from the class of an IPv4 address.
2769                  */
2770                 if (opt_flags & OP_MASKLEN) {
2771                         preflen = strtol(prefp, NULL, 10);
2772                         if (preflen < 0L || preflen == LONG_MAX)
2773                                 goto fail;
2774                         bcopy(sa, &net->nt_mask, sa->sa_len);
2775                         if (makemask(&net->nt_mask, (int)preflen) != 0)
2776                                 goto fail;
2777                         opt_flags |= OP_HAVEMASK;
2778                         *p = '/';
2779                 } else if (sa->sa_family == AF_INET &&
2780                     (opt_flags & OP_MASK) == 0) {
2781                         in_addr_t addr;
2782
2783                         addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
2784                         if (IN_CLASSA(addr))
2785                                 preflen = 8;
2786                         else if (IN_CLASSB(addr))
2787                                 preflen = 16;
2788                         else if (IN_CLASSC(addr))
2789                                 preflen = 24;
2790                         else if (IN_CLASSD(addr))
2791                                 preflen = 28;
2792                         else
2793                                 preflen = 32;   /* XXX */
2794
2795                         bcopy(sa, &net->nt_mask, sa->sa_len);
2796                         makemask(&net->nt_mask, (int)preflen);
2797                         opt_flags |= OP_HAVEMASK;
2798                 }
2799         }
2800
2801         if (ai)
2802                 freeaddrinfo(ai);
2803         return 0;
2804
2805 fail:
2806         if (ai)
2807                 freeaddrinfo(ai);
2808         return 1;
2809 }
2810
2811 /*
2812  * Parse out the next white space separated field
2813  */
2814 static void
2815 nextfield(char **cp, char **endcp)
2816 {
2817         char *p;
2818
2819         p = *cp;
2820         while (*p == ' ' || *p == '\t')
2821                 p++;
2822         if (*p == '\n' || *p == '\0')
2823                 *cp = *endcp = p;
2824         else {
2825                 *cp = p++;
2826                 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
2827                         p++;
2828                 *endcp = p;
2829         }
2830 }
2831
2832 /*
2833  * Get an exports file line. Skip over blank lines and handle line
2834  * continuations.
2835  */
2836 static int
2837 get_line(void)
2838 {
2839         char *p, *cp;
2840         size_t len;
2841         int totlen, cont_line;
2842
2843         /*
2844          * Loop around ignoring blank lines and getting all continuation lines.
2845          */
2846         p = line;
2847         totlen = 0;
2848         do {
2849                 if ((p = fgetln(exp_file, &len)) == NULL)
2850                         return (0);
2851                 cp = p + len - 1;
2852                 cont_line = 0;
2853                 while (cp >= p &&
2854                     (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) {
2855                         if (*cp == '\\')
2856                                 cont_line = 1;
2857                         cp--;
2858                         len--;
2859                 }
2860                 if (cont_line) {
2861                         *++cp = ' ';
2862                         len++;
2863                 }
2864                 if (linesize < len + totlen + 1) {
2865                         linesize = len + totlen + 1;
2866                         line = realloc(line, linesize);
2867                         if (line == NULL)
2868                                 out_of_mem();
2869                 }
2870                 memcpy(line + totlen, p, len);
2871                 totlen += len;
2872                 line[totlen] = '\0';
2873         } while (totlen == 0 || cont_line);
2874         return (1);
2875 }
2876
2877 /*
2878  * Parse a description of a credential.
2879  */
2880 static void
2881 parsecred(char *namelist, struct xucred *cr)
2882 {
2883         char *name;
2884         int cnt;
2885         char *names;
2886         struct passwd *pw;
2887         struct group *gr;
2888         gid_t groups[XU_NGROUPS + 1];
2889         int ngroups;
2890
2891         cr->cr_version = XUCRED_VERSION;
2892         /*
2893          * Set up the unprivileged user.
2894          */
2895         cr->cr_uid = -2;
2896         cr->cr_groups[0] = -2;
2897         cr->cr_ngroups = 1;
2898         /*
2899          * Get the user's password table entry.
2900          */
2901         names = strsep_quote(&namelist, " \t\n");
2902         name = strsep(&names, ":");
2903         /* Bug?  name could be NULL here */
2904         if (isdigit(*name) || *name == '-')
2905                 pw = getpwuid(atoi(name));
2906         else
2907                 pw = getpwnam(name);
2908         /*
2909          * Credentials specified as those of a user.
2910          */
2911         if (names == NULL) {
2912                 if (pw == NULL) {
2913                         syslog(LOG_ERR, "unknown user: %s", name);
2914                         return;
2915                 }
2916                 cr->cr_uid = pw->pw_uid;
2917                 ngroups = XU_NGROUPS + 1;
2918                 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups))
2919                         syslog(LOG_ERR, "too many groups");
2920                 /*
2921                  * Compress out duplicate.
2922                  */
2923                 cr->cr_ngroups = ngroups - 1;
2924                 cr->cr_groups[0] = groups[0];
2925                 for (cnt = 2; cnt < ngroups; cnt++)
2926                         cr->cr_groups[cnt - 1] = groups[cnt];
2927                 return;
2928         }
2929         /*
2930          * Explicit credential specified as a colon separated list:
2931          *      uid:gid:gid:...
2932          */
2933         if (pw != NULL)
2934                 cr->cr_uid = pw->pw_uid;
2935         else if (isdigit(*name) || *name == '-')
2936                 cr->cr_uid = atoi(name);
2937         else {
2938                 syslog(LOG_ERR, "unknown user: %s", name);
2939                 return;
2940         }
2941         cr->cr_ngroups = 0;
2942         while (names != NULL && *names != '\0' && cr->cr_ngroups < XU_NGROUPS) {
2943                 name = strsep(&names, ":");
2944                 if (isdigit(*name) || *name == '-') {
2945                         cr->cr_groups[cr->cr_ngroups++] = atoi(name);
2946                 } else {
2947                         if ((gr = getgrnam(name)) == NULL) {
2948                                 syslog(LOG_ERR, "unknown group: %s", name);
2949                                 continue;
2950                         }
2951                         cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid;
2952                 }
2953         }
2954         if (names != NULL && *names != '\0' && cr->cr_ngroups == XU_NGROUPS)
2955                 syslog(LOG_ERR, "too many groups");
2956 }
2957
2958 #define STRSIZ  (MNTNAMLEN+MNTPATHLEN+50)
2959 /*
2960  * Routines that maintain the remote mounttab
2961  */
2962 static void
2963 get_mountlist(void)
2964 {
2965         struct mountlist *mlp;
2966         char *host, *dirp, *cp;
2967         char str[STRSIZ];
2968         FILE *mlfile;
2969
2970         if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) {
2971                 if (errno == ENOENT)
2972                         return;
2973                 else {
2974                         syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST);
2975                         return;
2976                 }
2977         }
2978         while (fgets(str, STRSIZ, mlfile) != NULL) {
2979                 cp = str;
2980                 host = strsep(&cp, " \t\n");
2981                 dirp = strsep(&cp, " \t\n");
2982                 if (host == NULL || dirp == NULL)
2983                         continue;
2984                 mlp = (struct mountlist *)malloc(sizeof (*mlp));
2985                 if (mlp == (struct mountlist *)NULL)
2986                         out_of_mem();
2987                 strncpy(mlp->ml_host, host, MNTNAMLEN);
2988                 mlp->ml_host[MNTNAMLEN] = '\0';
2989                 strncpy(mlp->ml_dirp, dirp, MNTPATHLEN);
2990                 mlp->ml_dirp[MNTPATHLEN] = '\0';
2991
2992                 SLIST_INSERT_HEAD(&mlhead, mlp, next);
2993         }
2994         fclose(mlfile);
2995 }
2996
2997 static void
2998 del_mlist(char *hostp, char *dirp)
2999 {
3000         struct mountlist *mlp, *mlp2;
3001         FILE *mlfile;
3002         int fnd = 0;
3003
3004         SLIST_FOREACH_SAFE(mlp, &mlhead, next, mlp2) {
3005                 if (!strcmp(mlp->ml_host, hostp) &&
3006                     (!dirp || !strcmp(mlp->ml_dirp, dirp))) {
3007                         fnd = 1;
3008                         SLIST_REMOVE(&mlhead, mlp, mountlist, next);
3009                         free((caddr_t)mlp);
3010                 }
3011         }
3012         if (fnd) {
3013                 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) {
3014                         syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST);
3015                         return;
3016                 }
3017                 SLIST_FOREACH(mlp, &mlhead, next) {
3018                         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
3019                 }
3020                 fclose(mlfile);
3021         }
3022 }
3023
3024 static void
3025 add_mlist(char *hostp, char *dirp)
3026 {
3027         struct mountlist *mlp;
3028         FILE *mlfile;
3029
3030         SLIST_FOREACH(mlp, &mlhead, next) {
3031                 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp))
3032                         return;
3033         }
3034
3035         mlp = (struct mountlist *)malloc(sizeof (*mlp));
3036         if (mlp == (struct mountlist *)NULL)
3037                 out_of_mem();
3038         strncpy(mlp->ml_host, hostp, MNTNAMLEN);
3039         mlp->ml_host[MNTNAMLEN] = '\0';
3040         strncpy(mlp->ml_dirp, dirp, MNTPATHLEN);
3041         mlp->ml_dirp[MNTPATHLEN] = '\0';
3042         SLIST_INSERT_HEAD(&mlhead, mlp, next);
3043         if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
3044                 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST);
3045                 return;
3046         }
3047         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
3048         fclose(mlfile);
3049 }
3050
3051 /*
3052  * Free up a group list.
3053  */
3054 static void
3055 free_grp(struct grouplist *grp)
3056 {
3057         if (grp->gr_type == GT_HOST) {
3058                 if (grp->gr_ptr.gt_addrinfo != NULL)
3059                         freeaddrinfo(grp->gr_ptr.gt_addrinfo);
3060         } else if (grp->gr_type == GT_NET) {
3061                 if (grp->gr_ptr.gt_net.nt_name)
3062                         free(grp->gr_ptr.gt_net.nt_name);
3063         }
3064         free((caddr_t)grp);
3065 }
3066
3067 #ifdef DEBUG
3068 static void
3069 SYSLOG(int pri, const char *fmt, ...)
3070 {
3071         va_list ap;
3072
3073         va_start(ap, fmt);
3074         vfprintf(stderr, fmt, ap);
3075         va_end(ap);
3076 }
3077 #endif /* DEBUG */
3078
3079 /*
3080  * Check options for consistency.
3081  */
3082 static int
3083 check_options(struct dirlist *dp)
3084 {
3085
3086         if (v4root_phase == 0 && dp == NULL)
3087             return (1);
3088         if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL)) {
3089             syslog(LOG_ERR, "-mapall and -maproot mutually exclusive");
3090             return (1);
3091         }
3092         if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) {
3093                 syslog(LOG_ERR, "-mask requires -network");
3094                 return (1);
3095         }
3096         if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) {
3097                 syslog(LOG_ERR, "-network requires mask specification");
3098                 return (1);
3099         }
3100         if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) {
3101                 syslog(LOG_ERR, "-mask and /masklen are mutually exclusive");
3102                 return (1);
3103         }
3104         if (v4root_phase > 0 &&
3105             (opt_flags &
3106              ~(OP_SEC | OP_MASK | OP_NET | OP_HAVEMASK | OP_MASKLEN)) != 0) {
3107             syslog(LOG_ERR,"only -sec,-net,-mask options allowed on V4:");
3108             return (1);
3109         }
3110         if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
3111             syslog(LOG_ERR, "-alldirs has multiple directories");
3112             return (1);
3113         }
3114         return (0);
3115 }
3116
3117 /*
3118  * Check an absolute directory path for any symbolic links. Return true
3119  */
3120 static int
3121 check_dirpath(char *dirp)
3122 {
3123         char *cp;
3124         int ret = 1;
3125         struct stat sb;
3126
3127         cp = dirp + 1;
3128         while (*cp && ret) {
3129                 if (*cp == '/') {
3130                         *cp = '\0';
3131                         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
3132                                 ret = 0;
3133                         *cp = '/';
3134                 }
3135                 cp++;
3136         }
3137         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
3138                 ret = 0;
3139         return (ret);
3140 }
3141
3142 /*
3143  * Make a netmask according to the specified prefix length. The ss_family
3144  * and other non-address fields must be initialised before calling this.
3145  */
3146 static int
3147 makemask(struct sockaddr_storage *ssp, int bitlen)
3148 {
3149         u_char *p;
3150         int bits, i, len;
3151
3152         if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL)
3153                 return (-1);
3154         if (bitlen > len * CHAR_BIT)
3155                 return (-1);
3156
3157         for (i = 0; i < len; i++) {
3158                 bits = MIN(CHAR_BIT, bitlen);
3159                 *p++ = (u_char)~0 << (CHAR_BIT - bits);
3160                 bitlen -= bits;
3161         }
3162         return 0;
3163 }
3164
3165 /*
3166  * Check that the sockaddr is a valid netmask. Returns 0 if the mask
3167  * is acceptable (i.e. of the form 1...10....0).
3168  */
3169 static int
3170 checkmask(struct sockaddr *sa)
3171 {
3172         u_char *mask;
3173         int i, len;
3174
3175         if ((mask = sa_rawaddr(sa, &len)) == NULL)
3176                 return (-1);
3177
3178         for (i = 0; i < len; i++)
3179                 if (mask[i] != 0xff)
3180                         break;
3181         if (i < len) {
3182                 if (~mask[i] & (u_char)(~mask[i] + 1))
3183                         return (-1);
3184                 i++;
3185         }
3186         for (; i < len; i++)
3187                 if (mask[i] != 0)
3188                         return (-1);
3189         return (0);
3190 }
3191
3192 /*
3193  * Compare two sockaddrs according to a specified mask. Return zero if
3194  * `sa1' matches `sa2' when filtered by the netmask in `samask'.
3195  * If samask is NULL, perform a full comparison.
3196  */
3197 static int
3198 sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask)
3199 {
3200         unsigned char *p1, *p2, *mask;
3201         int len, i;
3202
3203         if (sa1->sa_family != sa2->sa_family ||
3204             (p1 = sa_rawaddr(sa1, &len)) == NULL ||
3205             (p2 = sa_rawaddr(sa2, NULL)) == NULL)
3206                 return (1);
3207
3208         switch (sa1->sa_family) {
3209         case AF_INET6:
3210                 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
3211                     ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
3212                         return (1);
3213                 break;
3214         }
3215
3216         /* Simple binary comparison if no mask specified. */
3217         if (samask == NULL)
3218                 return (memcmp(p1, p2, len));
3219
3220         /* Set up the mask, and do a mask-based comparison. */
3221         if (sa1->sa_family != samask->sa_family ||
3222             (mask = sa_rawaddr(samask, NULL)) == NULL)
3223                 return (1);
3224
3225         for (i = 0; i < len; i++)
3226                 if ((p1[i] & mask[i]) != (p2[i] & mask[i]))
3227                         return (1);
3228         return (0);
3229 }
3230
3231 /*
3232  * Return a pointer to the part of the sockaddr that contains the
3233  * raw address, and set *nbytes to its length in bytes. Returns
3234  * NULL if the address family is unknown.
3235  */
3236 static void *
3237 sa_rawaddr(struct sockaddr *sa, int *nbytes) {
3238         void *p;
3239         int len;
3240
3241         switch (sa->sa_family) {
3242         case AF_INET:
3243                 len = sizeof(((struct sockaddr_in *)sa)->sin_addr);
3244                 p = &((struct sockaddr_in *)sa)->sin_addr;
3245                 break;
3246         case AF_INET6:
3247                 len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr);
3248                 p = &((struct sockaddr_in6 *)sa)->sin6_addr;
3249                 break;
3250         default:
3251                 p = NULL;
3252                 len = 0;
3253         }
3254
3255         if (nbytes != NULL)
3256                 *nbytes = len;
3257         return (p);
3258 }
3259
3260 static void
3261 huphandler(int sig __unused)
3262 {
3263
3264         got_sighup = 1;
3265 }
3266
3267 static void
3268 terminate(int sig __unused)
3269 {
3270         pidfile_remove(pfh);
3271         rpcb_unset(MOUNTPROG, MOUNTVERS, NULL);
3272         rpcb_unset(MOUNTPROG, MOUNTVERS3, NULL);
3273         exit (0);
3274 }