usr.sbin/mountd/mountd.c

   1 /*
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Herb Hasler and Rick Macklem at The University of Guelph.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 4. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #ifndef lint
  34 static const char copyright[] =
  35 "@(#) Copyright (c) 1989, 1993\n\
  36         The Regents of the University of California.  All rights reserved.\n";
  37 #endif /*not lint*/
  38
  39 #if 0
  40 #ifndef lint
  41 static char sccsid[] = "@(#)mountd.c    8.15 (Berkeley) 5/1/95";
  42 #endif /*not lint*/
  43 #endif
  44
  45 #include <sys/cdefs.h>
  46 __FBSDID("$FreeBSD$");
  47
  48 #include <sys/param.h>
  49 #include <sys/fcntl.h>
  50 #include <sys/linker.h>
  51 #include <sys/module.h>
  52 #include <sys/mount.h>
  53 #include <sys/stat.h>
  54 #include <sys/sysctl.h>
  55 #include <sys/syslog.h>
  56
  57 #include <rpc/rpc.h>
  58 #include <rpc/rpc_com.h>
  59 #include <rpc/pmap_clnt.h>
  60 #include <rpc/pmap_prot.h>
  61 #include <rpcsvc/mount.h>
  62 #include <nfs/nfsproto.h>
  63 #include <nfs/nfssvc.h>
  64 #include <nfsserver/nfs.h>
  65
  66 #include <fs/nfs/nfsport.h>
  67
  68 #include <arpa/inet.h>
  69
  70 #include <ctype.h>
  71 #include <err.h>
  72 #include <errno.h>
  73 #include <grp.h>
  74 #include <libutil.h>
  75 #include <limits.h>
  76 #include <netdb.h>
  77 #include <pwd.h>
  78 #include <signal.h>
  79 #include <stdio.h>
  80 #include <stdlib.h>
  81 #include <string.h>
  82 #include <unistd.h>
  83 #include "pathnames.h"
  84 #include "mntopts.h"
  85
  86 #ifdef DEBUG
  87 #include <stdarg.h>
  88 #endif
  89
  90 /*
  91  * Structures for keeping the mount list and export list
  92  */
  93 struct mountlist {
  94         struct mountlist *ml_next;
  95         char    ml_host[MNTNAMLEN+1];
  96         char    ml_dirp[MNTPATHLEN+1];
  97 };
  98
  99 struct dirlist {
 100         struct dirlist  *dp_left;
 101         struct dirlist  *dp_right;
 102         int             dp_flag;
 103         struct hostlist *dp_hosts;      /* List of hosts this dir exported to */
 104         char            dp_dirp[1];     /* Actually malloc'd to size of dir */
 105 };
 106 /* dp_flag bits */
 107 #define DP_DEFSET       0x1
 108 #define DP_HOSTSET      0x2
 109
 110 struct exportlist {
 111         struct exportlist *ex_next;
 112         struct dirlist  *ex_dirl;
 113         struct dirlist  *ex_defdir;
 114         int             ex_flag;
 115         fsid_t          ex_fs;
 116         char            *ex_fsdir;
 117         char            *ex_indexfile;
 118         int             ex_numsecflavors;
 119         int             ex_secflavors[MAXSECFLAVORS];
 120         int             ex_defnumsecflavors;
 121         int             ex_defsecflavors[MAXSECFLAVORS];
 122 };
 123 /* ex_flag bits */
 124 #define EX_LINKED       0x1
 125
 126 struct netmsk {
 127         struct sockaddr_storage nt_net;
 128         struct sockaddr_storage nt_mask;
 129         char            *nt_name;
 130 };
 131
 132 union grouptypes {
 133         struct addrinfo *gt_addrinfo;
 134         struct netmsk   gt_net;
 135 };
 136
 137 struct grouplist {
 138         int gr_type;
 139         union grouptypes gr_ptr;
 140         struct grouplist *gr_next;
 141         int gr_numsecflavors;
 142         int gr_secflavors[MAXSECFLAVORS];
 143 };
 144 /* Group types */
 145 #define GT_NULL         0x0
 146 #define GT_HOST         0x1
 147 #define GT_NET          0x2
 148 #define GT_DEFAULT      0x3
 149 #define GT_IGNORE       0x5
 150
 151 struct hostlist {
 152         int              ht_flag;       /* Uses DP_xx bits */
 153         struct grouplist *ht_grp;
 154         struct hostlist  *ht_next;
 155 };
 156
 157 struct fhreturn {
 158         int     fhr_flag;
 159         int     fhr_vers;
 160         nfsfh_t fhr_fh;
 161         int     fhr_numsecflavors;
 162         int     *fhr_secflavors;
 163 };
 164
 165 #define GETPORT_MAXTRY  20      /* Max tries to get a port # */
 166
 167 /* Global defs */
 168 static char     *add_expdir(struct dirlist **, char *, int);
 169 static void     add_dlist(struct dirlist **, struct dirlist *,
 170                     struct grouplist *, int, struct exportlist *);
 171 static void     add_mlist(char *, char *);
 172 static int      check_dirpath(char *);
 173 static int      check_options(struct dirlist *);
 174 static int      checkmask(struct sockaddr *sa);
 175 static int      chk_host(struct dirlist *, struct sockaddr *, int *, int *,
 176                     int *, int **);
 177 static char     *strsep_quote(char **stringp, const char *delim);
 178 static int      create_service(struct netconfig *nconf);
 179 static void     complete_service(struct netconfig *nconf, char *port_str);
 180 static void     clearout_service(void);
 181 static void     del_mlist(char *hostp, char *dirp);
 182 static struct dirlist   *dirp_search(struct dirlist *, char *);
 183 static int      do_mount(struct exportlist *, struct grouplist *, int,
 184                     struct xucred *, char *, int, struct statfs *);
 185 static int      do_opt(char **, char **, struct exportlist *,
 186                     struct grouplist *, int *, int *, struct xucred *);
 187 static struct exportlist        *ex_search(fsid_t *);
 188 static struct exportlist        *get_exp(void);
 189 static void     free_dir(struct dirlist *);
 190 static void     free_exp(struct exportlist *);
 191 static void     free_grp(struct grouplist *);
 192 static void     free_host(struct hostlist *);
 193 static void     get_exportlist(void);
 194 static int      get_host(char *, struct grouplist *, struct grouplist *);
 195 static struct hostlist *get_ht(void);
 196 static int      get_line(void);
 197 static void     get_mountlist(void);
 198 static int      get_net(char *, struct netmsk *, int);
 199 static void     getexp_err(struct exportlist *, struct grouplist *);
 200 static struct grouplist *get_grp(void);
 201 static void     hang_dirp(struct dirlist *, struct grouplist *,
 202                                 struct exportlist *, int);
 203 static void     huphandler(int sig);
 204 static int      makemask(struct sockaddr_storage *ssp, int bitlen);
 205 static void     mntsrv(struct svc_req *, SVCXPRT *);
 206 static void     nextfield(char **, char **);
 207 static void     out_of_mem(void);
 208 static void     parsecred(char *, struct xucred *);
 209 static int      parsesec(char *, struct exportlist *);
 210 static int      put_exlist(struct dirlist *, XDR *, struct dirlist *,
 211                     int *, int);
 212 static void     *sa_rawaddr(struct sockaddr *sa, int *nbytes);
 213 static int      sacmp(struct sockaddr *sa1, struct sockaddr *sa2,
 214                     struct sockaddr *samask);
 215 static int      scan_tree(struct dirlist *, struct sockaddr *);
 216 static void     usage(void);
 217 static int      xdr_dir(XDR *, char *);
 218 static int      xdr_explist(XDR *, caddr_t);
 219 static int      xdr_explist_brief(XDR *, caddr_t);
 220 static int      xdr_explist_common(XDR *, caddr_t, int);
 221 static int      xdr_fhs(XDR *, caddr_t);
 222 static int      xdr_mlist(XDR *, caddr_t);
 223 static void     terminate(int);
 224
 225 static struct exportlist *exphead;
 226 static struct mountlist *mlhead;
 227 static struct grouplist *grphead;
 228 static char *exnames_default[2] = { _PATH_EXPORTS, NULL };
 229 static char **exnames;
 230 static char **hosts = NULL;
 231 static struct xucred def_anon = {
 232         XUCRED_VERSION,
 233         (uid_t)-2,
 234         1,
 235         { (gid_t)-2 },
 236         NULL
 237 };
 238 static int force_v2 = 0;
 239 static int resvport_only = 1;
 240 static int nhosts = 0;
 241 static int dir_only = 1;
 242 static int dolog = 0;
 243 static int got_sighup = 0;
 244 static int xcreated = 0;
 245
 246 static char *svcport_str = NULL;
 247 static int mallocd_svcport = 0;
 248 static int *sock_fd;
 249 static int sock_fdcnt;
 250 static int sock_fdpos;
 251 static int suspend_nfsd = 0;
 252
 253 static int opt_flags;
 254 static int have_v6 = 1;
 255
 256 static int v4root_phase = 0;
 257 static char v4root_dirpath[PATH_MAX + 1];
 258 static int has_publicfh = 0;
 259
 260 static struct pidfh *pfh = NULL;
 261 /* Bits for opt_flags above */
 262 #define OP_MAPROOT      0x01
 263 #define OP_MAPALL       0x02
 264 /* 0x4 free */
 265 #define OP_MASK         0x08
 266 #define OP_NET          0x10
 267 #define OP_ALLDIRS      0x40
 268 #define OP_HAVEMASK     0x80    /* A mask was specified or inferred. */
 269 #define OP_QUIET        0x100
 270 #define OP_MASKLEN      0x200
 271 #define OP_SEC          0x400
 272
 273 #ifdef DEBUG
 274 static int debug = 1;
 275 static void     SYSLOG(int, const char *, ...) __printflike(2, 3);
 276 #define syslog SYSLOG
 277 #else
 278 static int debug = 0;
 279 #endif
 280
 281 /*
 282  * Similar to strsep(), but it allows for quoted strings
 283  * and escaped characters.
 284  *
 285  * It returns the string (or NULL, if *stringp is NULL),
 286  * which is a de-quoted version of the string if necessary.
 287  *
 288  * It modifies *stringp in place.
 289  */
 290 static char *
 291 strsep_quote(char **stringp, const char *delim)
 292 {
 293         char *srcptr, *dstptr, *retval;
 294         char quot = 0;
 295
 296         if (stringp == NULL || *stringp == NULL)
 297                 return (NULL);
 298
 299         srcptr = dstptr = retval = *stringp;
 300
 301         while (*srcptr) {
 302                 /*
 303                  * We're looking for several edge cases here.
 304                  * First:  if we're in quote state (quot != 0),
 305                  * then we ignore the delim characters, but otherwise
 306                  * process as normal, unless it is the quote character.
 307                  * Second:  if the current character is a backslash,
 308                  * we take the next character as-is, without checking
 309                  * for delim, quote, or backslash.  Exception:  if the
 310                  * next character is a NUL, that's the end of the string.
 311                  * Third:  if the character is a quote character, we toggle
 312                  * quote state.
 313                  * Otherwise:  check the current character for NUL, or
 314                  * being in delim, and end the string if either is true.
 315                  */
 316                 if (*srcptr == '\\') {
 317                         srcptr++;
 318                         /*
 319                          * The edge case here is if the next character
 320                          * is NUL, we want to stop processing.  But if
 321                          * it's not NUL, then we simply want to copy it.
 322                          */
 323                         if (*srcptr) {
 324                                 *dstptr++ = *srcptr++;
 325                         }
 326                         continue;
 327                 }
 328                 if (quot == 0 && (*srcptr == '\'' || *srcptr == '"')) {
 329                         quot = *srcptr++;
 330                         continue;
 331                 }
 332                 if (quot && *srcptr == quot) {
 333                         /* End of the quoted part */
 334                         quot = 0;
 335                         srcptr++;
 336                         continue;
 337                 }
 338                 if (!quot && strchr(delim, *srcptr))
 339                         break;
 340                 *dstptr++ = *srcptr++;
 341         }
 342
 343         *dstptr = 0; /* Terminate the string */
 344         *stringp = (*srcptr == '\0') ? NULL : srcptr + 1;
 345         return (retval);
 346 }
 347
 348 /*
 349  * Mountd server for NFS mount protocol as described in:
 350  * NFS: Network File System Protocol Specification, RFC1094, Appendix A
 351  * The optional arguments are the exports file name
 352  * default: _PATH_EXPORTS
 353  * and "-n" to allow nonroot mount.
 354  */
 355 int
 356 main(int argc, char **argv)
 357 {
 358         fd_set readfds;
 359         struct netconfig *nconf;
 360         char *endptr, **hosts_bak;
 361         void *nc_handle;
 362         pid_t otherpid;
 363         in_port_t svcport;
 364         int c, k, s;
 365         int maxrec = RPC_MAXDATASIZE;
 366         int attempt_cnt, port_len, port_pos, ret;
 367         char **port_list;
 368
 369         /* Check that another mountd isn't already running. */
 370         pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &otherpid);
 371         if (pfh == NULL) {
 372                 if (errno == EEXIST)
 373                         errx(1, "mountd already running, pid: %d.", otherpid);
 374                 warn("cannot open or create pidfile");
 375         }
 376
 377         s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
 378         if (s < 0)
 379                 have_v6 = 0;
 380         else
 381                 close(s);
 382
 383         while ((c = getopt(argc, argv, "2deh:lnp:rS")) != -1)
 384                 switch (c) {
 385                 case '2':
 386                         force_v2 = 1;
 387                         break;
 388                 case 'e':
 389                         /* now a no-op, since this is the default */
 390                         break;
 391                 case 'n':
 392                         resvport_only = 0;
 393                         break;
 394                 case 'r':
 395                         dir_only = 0;
 396                         break;
 397                 case 'd':
 398                         debug = debug ? 0 : 1;
 399                         break;
 400                 case 'l':
 401                         dolog = 1;
 402                         break;
 403                 case 'p':
 404                         endptr = NULL;
 405                         svcport = (in_port_t)strtoul(optarg, &endptr, 10);
 406                         if (endptr == NULL || *endptr != '\0' ||
 407                             svcport == 0 || svcport >= IPPORT_MAX)
 408                                 usage();
 409                         svcport_str = strdup(optarg);
 410                         break;
 411                 case 'h':
 412                         ++nhosts;
 413                         hosts_bak = hosts;
 414                         hosts_bak = realloc(hosts, nhosts * sizeof(char *));
 415                         if (hosts_bak == NULL) {
 416                                 if (hosts != NULL) {
 417                                         for (k = 0; k < nhosts; k++)
 418                                                 free(hosts[k]);
 419                                         free(hosts);
 420                                         out_of_mem();
 421                                 }
 422                         }
 423                         hosts = hosts_bak;
 424                         hosts[nhosts - 1] = strdup(optarg);
 425                         if (hosts[nhosts - 1] == NULL) {
 426                                 for (k = 0; k < (nhosts - 1); k++)
 427                                         free(hosts[k]);
 428                                 free(hosts);
 429                                 out_of_mem();
 430                         }
 431                         break;
 432                 case 'S':
 433                         suspend_nfsd = 1;
 434                         break;
 435                 default:
 436                         usage();
 437                 };
 438
 439         if (modfind("nfsd") < 0) {
 440                 /* Not present in kernel, try loading it */
 441                 if (kldload("nfsd") < 0 || modfind("nfsd") < 0)
 442                         errx(1, "NFS server is not available");
 443         }
 444
 445         argc -= optind;
 446         argv += optind;
 447         grphead = (struct grouplist *)NULL;
 448         exphead = (struct exportlist *)NULL;
 449         mlhead = (struct mountlist *)NULL;
 450         if (argc > 0)
 451                 exnames = argv;
 452         else
 453                 exnames = exnames_default;
 454         openlog("mountd", LOG_PID, LOG_DAEMON);
 455         if (debug)
 456                 warnx("getting export list");
 457         get_exportlist();
 458         if (debug)
 459                 warnx("getting mount list");
 460         get_mountlist();
 461         if (debug)
 462                 warnx("here we go");
 463         if (debug == 0) {
 464                 daemon(0, 0);
 465                 signal(SIGINT, SIG_IGN);
 466                 signal(SIGQUIT, SIG_IGN);
 467         }
 468         signal(SIGHUP, huphandler);
 469         signal(SIGTERM, terminate);
 470         signal(SIGPIPE, SIG_IGN);
 471
 472         pidfile_write(pfh);
 473
 474         rpcb_unset(MOUNTPROG, MOUNTVERS, NULL);
 475         rpcb_unset(MOUNTPROG, MOUNTVERS3, NULL);
 476         rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);
 477
 478         if (!resvport_only) {
 479                 if (sysctlbyname("vfs.nfsrv.nfs_privport", NULL, NULL,
 480                     &resvport_only, sizeof(resvport_only)) != 0 &&
 481                     errno != ENOENT) {
 482                         syslog(LOG_ERR, "sysctl: %m");
 483                         exit(1);
 484                 }
 485         }
 486
 487         /*
 488          * If no hosts were specified, add a wildcard entry to bind to
 489          * INADDR_ANY. Otherwise make sure 127.0.0.1 and ::1 are added to the
 490          * list.
 491          */
 492         if (nhosts == 0) {
 493                 hosts = malloc(sizeof(char *));
 494                 if (hosts == NULL)
 495                         out_of_mem();
 496                 hosts[0] = "*";
 497                 nhosts = 1;
 498         } else {
 499                 hosts_bak = hosts;
 500                 if (have_v6) {
 501                         hosts_bak = realloc(hosts, (nhosts + 2) *
 502                             sizeof(char *));
 503                         if (hosts_bak == NULL) {
 504                                 for (k = 0; k < nhosts; k++)
 505                                         free(hosts[k]);
 506                                 free(hosts);
 507                                 out_of_mem();
 508                         } else
 509                                 hosts = hosts_bak;
 510                         nhosts += 2;
 511                         hosts[nhosts - 2] = "::1";
 512                 } else {
 513                         hosts_bak = realloc(hosts, (nhosts + 1) * sizeof(char *));
 514                         if (hosts_bak == NULL) {
 515                                 for (k = 0; k < nhosts; k++)
 516                                         free(hosts[k]);
 517                                 free(hosts);
 518                                 out_of_mem();
 519                         } else {
 520                                 nhosts += 1;
 521                                 hosts = hosts_bak;
 522                         }
 523                 }
 524
 525                 hosts[nhosts - 1] = "127.0.0.1";
 526         }
 527
 528         attempt_cnt = 1;
 529         sock_fdcnt = 0;
 530         sock_fd = NULL;
 531         port_list = NULL;
 532         port_len = 0;
 533         nc_handle = setnetconfig();
 534         while ((nconf = getnetconfig(nc_handle))) {
 535                 if (nconf->nc_flag & NC_VISIBLE) {
 536                         if (have_v6 == 0 && strcmp(nconf->nc_protofmly,
 537                             "inet6") == 0) {
 538                                 /* DO NOTHING */
 539                         } else {
 540                                 ret = create_service(nconf);
 541                                 if (ret == 1)
 542                                         /* Ignore this call */
 543                                         continue;
 544                                 if (ret < 0) {
 545                                         /*
 546                                          * Failed to bind port, so close off
 547                                          * all sockets created and try again
 548                                          * if the port# was dynamically
 549                                          * assigned via bind(2).
 550                                          */
 551                                         clearout_service();
 552                                         if (mallocd_svcport != 0 &&
 553                                             attempt_cnt < GETPORT_MAXTRY) {
 554                                                 free(svcport_str);
 555                                                 svcport_str = NULL;
 556                                                 mallocd_svcport = 0;
 557                                         } else {
 558                                                 errno = EADDRINUSE;
 559                                                 syslog(LOG_ERR,
 560                                                     "bindresvport_sa: %m");
 561                                                 exit(1);
 562                                         }
 563
 564                                         /* Start over at the first service. */
 565                                         free(sock_fd);
 566                                         sock_fdcnt = 0;
 567                                         sock_fd = NULL;
 568                                         nc_handle = setnetconfig();
 569                                         attempt_cnt++;
 570                                 } else if (mallocd_svcport != 0 &&
 571                                     attempt_cnt == GETPORT_MAXTRY) {
 572                                         /*
 573                                          * For the last attempt, allow
 574                                          * different port #s for each nconf
 575                                          * by saving the svcport_str and
 576                                          * setting it back to NULL.
 577                                          */
 578                                         port_list = realloc(port_list,
 579                                             (port_len + 1) * sizeof(char *));
 580                                         if (port_list == NULL)
 581                                                 out_of_mem();
 582                                         port_list[port_len++] = svcport_str;
 583                                         svcport_str = NULL;
 584                                         mallocd_svcport = 0;
 585                                 }
 586                         }
 587                 }
 588         }
 589
 590         /*
 591          * Successfully bound the ports, so call complete_service() to
 592          * do the rest of the setup on the service(s).
 593          */
 594         sock_fdpos = 0;
 595         port_pos = 0;
 596         nc_handle = setnetconfig();
 597         while ((nconf = getnetconfig(nc_handle))) {
 598                 if (nconf->nc_flag & NC_VISIBLE) {
 599                         if (have_v6 == 0 && strcmp(nconf->nc_protofmly,
 600                             "inet6") == 0) {
 601                                 /* DO NOTHING */
 602                         } else if (port_list != NULL) {
 603                                 if (port_pos >= port_len) {
 604                                         syslog(LOG_ERR, "too many port#s");
 605                                         exit(1);
 606                                 }
 607                                 complete_service(nconf, port_list[port_pos++]);
 608                         } else
 609                                 complete_service(nconf, svcport_str);
 610                 }
 611         }
 612         endnetconfig(nc_handle);
 613         free(sock_fd);
 614         if (port_list != NULL) {
 615                 for (port_pos = 0; port_pos < port_len; port_pos++)
 616                         free(port_list[port_pos]);
 617                 free(port_list);
 618         }
 619
 620         if (xcreated == 0) {
 621                 syslog(LOG_ERR, "could not create any services");
 622                 exit(1);
 623         }
 624
 625         /* Expand svc_run() here so that we can call get_exportlist(). */
 626         for (;;) {
 627                 if (got_sighup) {
 628                         get_exportlist();
 629                         got_sighup = 0;
 630                 }
 631                 readfds = svc_fdset;
 632                 switch (select(svc_maxfd + 1, &readfds, NULL, NULL, NULL)) {
 633                 case -1:
 634                         if (errno == EINTR)
 635                                 continue;
 636                         syslog(LOG_ERR, "mountd died: select: %m");
 637                         exit(1);
 638                 case 0:
 639                         continue;
 640                 default:
 641                         svc_getreqset(&readfds);
 642                 }
 643         }
 644 }
 645
 646 /*
 647  * This routine creates and binds sockets on the appropriate
 648  * addresses. It gets called one time for each transport.
 649  * It returns 0 upon success, 1 for ingore the call and -1 to indicate
 650  * bind failed with EADDRINUSE.
 651  * Any file descriptors that have been created are stored in sock_fd and
 652  * the total count of them is maintained in sock_fdcnt.
 653  */
 654 static int
 655 create_service(struct netconfig *nconf)
 656 {
 657         struct addrinfo hints, *res = NULL;
 658         struct sockaddr_in *sin;
 659         struct sockaddr_in6 *sin6;
 660         struct __rpc_sockinfo si;
 661         int aicode;
 662         int fd;
 663         int nhostsbak;
 664         int one = 1;
 665         int r;
 666         u_int32_t host_addr[4];  /* IPv4 or IPv6 */
 667         int mallocd_res;
 668
 669         if ((nconf->nc_semantics != NC_TPI_CLTS) &&
 670             (nconf->nc_semantics != NC_TPI_COTS) &&
 671             (nconf->nc_semantics != NC_TPI_COTS_ORD))
 672                 return (1);     /* not my type */
 673
 674         /*
 675          * XXX - using RPC library internal functions.
 676          */
 677         if (!__rpc_nconf2sockinfo(nconf, &si)) {
 678                 syslog(LOG_ERR, "cannot get information for %s",
 679                     nconf->nc_netid);
 680                 return (1);
 681         }
 682
 683         /* Get mountd's address on this transport */
 684         memset(&hints, 0, sizeof hints);
 685         hints.ai_family = si.si_af;
 686         hints.ai_socktype = si.si_socktype;
 687         hints.ai_protocol = si.si_proto;
 688
 689         /*
 690          * Bind to specific IPs if asked to
 691          */
 692         nhostsbak = nhosts;
 693         while (nhostsbak > 0) {
 694                 --nhostsbak;
 695                 sock_fd = realloc(sock_fd, (sock_fdcnt + 1) * sizeof(int));
 696                 if (sock_fd == NULL)
 697                         out_of_mem();
 698                 sock_fd[sock_fdcnt++] = -1;     /* Set invalid for now. */
 699                 mallocd_res = 0;
 700
 701                 hints.ai_flags = AI_PASSIVE;
 702
 703                 /*
 704                  * XXX - using RPC library internal functions.
 705                  */
 706                 if ((fd = __rpc_nconf2fd(nconf)) < 0) {
 707                         int non_fatal = 0;
 708                         if (errno == EAFNOSUPPORT &&
 709                             nconf->nc_semantics != NC_TPI_CLTS)
 710                                 non_fatal = 1;
 711
 712                         syslog(non_fatal ? LOG_DEBUG : LOG_ERR,
 713                             "cannot create socket for %s", nconf->nc_netid);
 714                         if (non_fatal != 0)
 715                                 continue;
 716                         exit(1);
 717                 }
 718
 719                 switch (hints.ai_family) {
 720                 case AF_INET:
 721                         if (inet_pton(AF_INET, hosts[nhostsbak],
 722                             host_addr) == 1) {
 723                                 hints.ai_flags |= AI_NUMERICHOST;
 724                         } else {
 725                                 /*
 726                                  * Skip if we have an AF_INET6 address.
 727                                  */
 728                                 if (inet_pton(AF_INET6, hosts[nhostsbak],
 729                                     host_addr) == 1) {
 730                                         close(fd);
 731                                         continue;
 732                                 }
 733                         }
 734                         break;
 735                 case AF_INET6:
 736                         if (inet_pton(AF_INET6, hosts[nhostsbak],
 737                             host_addr) == 1) {
 738                                 hints.ai_flags |= AI_NUMERICHOST;
 739                         } else {
 740                                 /*
 741                                  * Skip if we have an AF_INET address.
 742                                  */
 743                                 if (inet_pton(AF_INET, hosts[nhostsbak],
 744                                     host_addr) == 1) {
 745                                         close(fd);
 746                                         continue;
 747                                 }
 748                         }
 749
 750                         /*
 751                          * We're doing host-based access checks here, so don't
 752                          * allow v4-in-v6 to confuse things. The kernel will
 753                          * disable it by default on NFS sockets too.
 754                          */
 755                         if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one,
 756                             sizeof one) < 0) {
 757                                 syslog(LOG_ERR,
 758                                     "can't disable v4-in-v6 on IPv6 socket");
 759                                 exit(1);
 760                         }
 761                         break;
 762                 default:
 763                         break;
 764                 }
 765
 766                 /*
 767                  * If no hosts were specified, just bind to INADDR_ANY
 768                  */
 769                 if (strcmp("*", hosts[nhostsbak]) == 0) {
 770                         if (svcport_str == NULL) {
 771                                 res = malloc(sizeof(struct addrinfo));
 772                                 if (res == NULL)
 773                                         out_of_mem();
 774                                 mallocd_res = 1;
 775                                 res->ai_flags = hints.ai_flags;
 776                                 res->ai_family = hints.ai_family;
 777                                 res->ai_protocol = hints.ai_protocol;
 778                                 switch (res->ai_family) {
 779                                 case AF_INET:
 780                                         sin = malloc(sizeof(struct sockaddr_in));
 781                                         if (sin == NULL)
 782                                                 out_of_mem();
 783                                         sin->sin_family = AF_INET;
 784                                         sin->sin_port = htons(0);
 785                                         sin->sin_addr.s_addr = htonl(INADDR_ANY);
 786                                         res->ai_addr = (struct sockaddr*) sin;
 787                                         res->ai_addrlen = (socklen_t)
 788                                             sizeof(struct sockaddr_in);
 789                                         break;
 790                                 case AF_INET6:
 791                                         sin6 = malloc(sizeof(struct sockaddr_in6));
 792                                         if (sin6 == NULL)
 793                                                 out_of_mem();
 794                                         sin6->sin6_family = AF_INET6;
 795                                         sin6->sin6_port = htons(0);
 796                                         sin6->sin6_addr = in6addr_any;
 797                                         res->ai_addr = (struct sockaddr*) sin6;
 798                                         res->ai_addrlen = (socklen_t)
 799                                             sizeof(struct sockaddr_in6);
 800                                         break;
 801                                 default:
 802                                         syslog(LOG_ERR, "bad addr fam %d",
 803                                             res->ai_family);
 804                                         exit(1);
 805                                 }
 806                         } else {
 807                                 if ((aicode = getaddrinfo(NULL, svcport_str,
 808                                     &hints, &res)) != 0) {
 809                                         syslog(LOG_ERR,
 810                                             "cannot get local address for %s: %s",
 811                                             nconf->nc_netid,
 812                                             gai_strerror(aicode));
 813                                         close(fd);
 814                                         continue;
 815                                 }
 816                         }
 817                 } else {
 818                         if ((aicode = getaddrinfo(hosts[nhostsbak], svcport_str,
 819                             &hints, &res)) != 0) {
 820                                 syslog(LOG_ERR,
 821                                     "cannot get local address for %s: %s",
 822                                     nconf->nc_netid, gai_strerror(aicode));
 823                                 close(fd);
 824                                 continue;
 825                         }
 826                 }
 827
 828                 /* Store the fd. */
 829                 sock_fd[sock_fdcnt - 1] = fd;
 830
 831                 /* Now, attempt the bind. */
 832                 r = bindresvport_sa(fd, res->ai_addr);
 833                 if (r != 0) {
 834                         if (errno == EADDRINUSE && mallocd_svcport != 0) {
 835                                 if (mallocd_res != 0) {
 836                                         free(res->ai_addr);
 837                                         free(res);
 838                                 } else
 839                                         freeaddrinfo(res);
 840                                 return (-1);
 841                         }
 842                         syslog(LOG_ERR, "bindresvport_sa: %m");
 843                         exit(1);
 844                 }
 845
 846                 if (svcport_str == NULL) {
 847                         svcport_str = malloc(NI_MAXSERV * sizeof(char));
 848                         if (svcport_str == NULL)
 849                                 out_of_mem();
 850                         mallocd_svcport = 1;
 851
 852                         if (getnameinfo(res->ai_addr,
 853                             res->ai_addr->sa_len, NULL, NI_MAXHOST,
 854                             svcport_str, NI_MAXSERV * sizeof(char),
 855                             NI_NUMERICHOST | NI_NUMERICSERV))
 856                                 errx(1, "Cannot get port number");
 857                 }
 858                 if (mallocd_res != 0) {
 859                         free(res->ai_addr);
 860                         free(res);
 861                 } else
 862                         freeaddrinfo(res);
 863                 res = NULL;
 864         }
 865         return (0);
 866 }
 867
 868 /*
 869  * Called after all the create_service() calls have succeeded, to complete
 870  * the setup and registration.
 871  */
 872 static void
 873 complete_service(struct netconfig *nconf, char *port_str)
 874 {
 875         struct addrinfo hints, *res = NULL;
 876         struct __rpc_sockinfo si;
 877         struct netbuf servaddr;
 878         SVCXPRT *transp = NULL;
 879         int aicode, fd, nhostsbak;
 880         int registered = 0;
 881
 882         if ((nconf->nc_semantics != NC_TPI_CLTS) &&
 883             (nconf->nc_semantics != NC_TPI_COTS) &&
 884             (nconf->nc_semantics != NC_TPI_COTS_ORD))
 885                 return; /* not my type */
 886
 887         /*
 888          * XXX - using RPC library internal functions.
 889          */
 890         if (!__rpc_nconf2sockinfo(nconf, &si)) {
 891                 syslog(LOG_ERR, "cannot get information for %s",
 892                     nconf->nc_netid);
 893                 return;
 894         }
 895
 896         nhostsbak = nhosts;
 897         while (nhostsbak > 0) {
 898                 --nhostsbak;
 899                 if (sock_fdpos >= sock_fdcnt) {
 900                         /* Should never happen. */
 901                         syslog(LOG_ERR, "Ran out of socket fd's");
 902                         return;
 903                 }
 904                 fd = sock_fd[sock_fdpos++];
 905                 if (fd < 0)
 906                         continue;
 907
 908                 if (nconf->nc_semantics != NC_TPI_CLTS)
 909                         listen(fd, SOMAXCONN);
 910
 911                 if (nconf->nc_semantics == NC_TPI_CLTS )
 912                         transp = svc_dg_create(fd, 0, 0);
 913                 else
 914                         transp = svc_vc_create(fd, RPC_MAXDATASIZE,
 915                             RPC_MAXDATASIZE);
 916
 917                 if (transp != (SVCXPRT *) NULL) {
 918                         if (!svc_reg(transp, MOUNTPROG, MOUNTVERS, mntsrv,
 919                             NULL))
 920                                 syslog(LOG_ERR,
 921                                     "can't register %s MOUNTVERS service",
 922                                     nconf->nc_netid);
 923                         if (!force_v2) {
 924                                 if (!svc_reg(transp, MOUNTPROG, MOUNTVERS3,
 925                                     mntsrv, NULL))
 926                                         syslog(LOG_ERR,
 927                                             "can't register %s MOUNTVERS3 service",
 928                                             nconf->nc_netid);
 929                         }
 930                 } else
 931                         syslog(LOG_WARNING, "can't create %s services",
 932                             nconf->nc_netid);
 933
 934                 if (registered == 0) {
 935                         registered = 1;
 936                         memset(&hints, 0, sizeof hints);
 937                         hints.ai_flags = AI_PASSIVE;
 938                         hints.ai_family = si.si_af;
 939                         hints.ai_socktype = si.si_socktype;
 940                         hints.ai_protocol = si.si_proto;
 941
 942                         if ((aicode = getaddrinfo(NULL, port_str, &hints,
 943                             &res)) != 0) {
 944                                 syslog(LOG_ERR, "cannot get local address: %s",
 945                                     gai_strerror(aicode));
 946                                 exit(1);
 947                         }
 948
 949                         servaddr.buf = malloc(res->ai_addrlen);
 950                         memcpy(servaddr.buf, res->ai_addr, res->ai_addrlen);
 951                         servaddr.len = res->ai_addrlen;
 952
 953                         rpcb_set(MOUNTPROG, MOUNTVERS, nconf, &servaddr);
 954                         rpcb_set(MOUNTPROG, MOUNTVERS3, nconf, &servaddr);
 955
 956                         xcreated++;
 957                         freeaddrinfo(res);
 958                 }
 959         } /* end while */
 960 }
 961
 962 /*
 963  * Clear out sockets after a failure to bind one of them, so that the
 964  * cycle of socket creation/binding can start anew.
 965  */
 966 static void
 967 clearout_service(void)
 968 {
 969         int i;
 970
 971         for (i = 0; i < sock_fdcnt; i++) {
 972                 if (sock_fd[i] >= 0) {
 973                         shutdown(sock_fd[i], SHUT_RDWR);
 974                         close(sock_fd[i]);
 975                 }
 976         }
 977 }
 978
 979 static void
 980 usage(void)
 981 {
 982         fprintf(stderr,
 983                 "usage: mountd [-2] [-d] [-e] [-l] [-n] [-p <port>] [-r] "
 984                 "[-S] [-h <bindip>] [export_file ...]\n");
 985         exit(1);
 986 }
 987
 988 /*
 989  * The mount rpc service
 990  */
 991 void
 992 mntsrv(struct svc_req *rqstp, SVCXPRT *transp)
 993 {
 994         struct exportlist *ep;
 995         struct dirlist *dp;
 996         struct fhreturn fhr;
 997         struct stat stb;
 998         struct statfs fsb;
 999         char host[NI_MAXHOST], numerichost[NI_MAXHOST];
1000         int lookup_failed = 1;
1001         struct sockaddr *saddr;
1002         u_short sport;
1003         char rpcpath[MNTPATHLEN + 1], dirpath[MAXPATHLEN];
1004         int bad = 0, defset, hostset;
1005         sigset_t sighup_mask;
1006         int numsecflavors, *secflavorsp;
1007
1008         sigemptyset(&sighup_mask);
1009         sigaddset(&sighup_mask, SIGHUP);
1010         saddr = svc_getrpccaller(transp)->buf;
1011         switch (saddr->sa_family) {
1012         case AF_INET6:
1013                 sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port);
1014                 break;
1015         case AF_INET:
1016                 sport = ntohs(((struct sockaddr_in *)saddr)->sin_port);
1017                 break;
1018         default:
1019                 syslog(LOG_ERR, "request from unknown address family");
1020                 return;
1021         }
1022         lookup_failed = getnameinfo(saddr, saddr->sa_len, host, sizeof host,
1023             NULL, 0, 0);
1024         getnameinfo(saddr, saddr->sa_len, numerichost,
1025             sizeof numerichost, NULL, 0, NI_NUMERICHOST);
1026         switch (rqstp->rq_proc) {
1027         case NULLPROC:
1028                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
1029                         syslog(LOG_ERR, "can't send reply");
1030                 return;
1031         case MOUNTPROC_MNT:
1032                 if (sport >= IPPORT_RESERVED && resvport_only) {
1033                         syslog(LOG_NOTICE,
1034                             "mount request from %s from unprivileged port",
1035                             numerichost);
1036                         svcerr_weakauth(transp);
1037                         return;
1038                 }
1039                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
1040                         syslog(LOG_NOTICE, "undecodable mount request from %s",
1041                             numerichost);
1042                         svcerr_decode(transp);
1043                         return;
1044                 }
1045
1046                 /*
1047                  * Get the real pathname and make sure it is a directory
1048                  * or a regular file if the -r option was specified
1049                  * and it exists.
1050                  */
1051                 if (realpath(rpcpath, dirpath) == NULL ||
1052                     stat(dirpath, &stb) < 0 ||
1053                     (!S_ISDIR(stb.st_mode) &&
1054                     (dir_only || !S_ISREG(stb.st_mode))) ||
1055                     statfs(dirpath, &fsb) < 0) {
1056                         chdir("/");     /* Just in case realpath doesn't */
1057                         syslog(LOG_NOTICE,
1058                             "mount request from %s for non existent path %s",
1059                             numerichost, dirpath);
1060                         if (debug)
1061                                 warnx("stat failed on %s", dirpath);
1062                         bad = ENOENT;   /* We will send error reply later */
1063                 }
1064
1065                 /* Check in the exports list */
1066                 sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
1067                 ep = ex_search(&fsb.f_fsid);
1068                 hostset = defset = 0;
1069                 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset,
1070                     &numsecflavors, &secflavorsp) ||
1071                     ((dp = dirp_search(ep->ex_dirl, dirpath)) &&
1072                       chk_host(dp, saddr, &defset, &hostset, &numsecflavors,
1073                        &secflavorsp)) ||
1074                     (defset && scan_tree(ep->ex_defdir, saddr) == 0 &&
1075                      scan_tree(ep->ex_dirl, saddr) == 0))) {
1076                         if (bad) {
1077                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
1078                                     (caddr_t)&bad))
1079                                         syslog(LOG_ERR, "can't send reply");
1080                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1081                                 return;
1082                         }
1083                         if (hostset & DP_HOSTSET) {
1084                                 fhr.fhr_flag = hostset;
1085                                 fhr.fhr_numsecflavors = numsecflavors;
1086                                 fhr.fhr_secflavors = secflavorsp;
1087                         } else {
1088                                 fhr.fhr_flag = defset;
1089                                 fhr.fhr_numsecflavors = ep->ex_defnumsecflavors;
1090                                 fhr.fhr_secflavors = ep->ex_defsecflavors;
1091                         }
1092                         fhr.fhr_vers = rqstp->rq_vers;
1093                         /* Get the file handle */
1094                         memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t));
1095                         if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) {
1096                                 bad = errno;
1097                                 syslog(LOG_ERR, "can't get fh for %s", dirpath);
1098                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
1099                                     (caddr_t)&bad))
1100                                         syslog(LOG_ERR, "can't send reply");
1101                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1102                                 return;
1103                         }
1104                         if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs,
1105                             (caddr_t)&fhr))
1106                                 syslog(LOG_ERR, "can't send reply");
1107                         if (!lookup_failed)
1108                                 add_mlist(host, dirpath);
1109                         else
1110                                 add_mlist(numerichost, dirpath);
1111                         if (debug)
1112                                 warnx("mount successful");
1113                         if (dolog)
1114                                 syslog(LOG_NOTICE,
1115                                     "mount request succeeded from %s for %s",
1116                                     numerichost, dirpath);
1117                 } else {
1118                         bad = EACCES;
1119                         syslog(LOG_NOTICE,
1120                             "mount request denied from %s for %s",
1121                             numerichost, dirpath);
1122                 }
1123
1124                 if (bad && !svc_sendreply(transp, (xdrproc_t)xdr_long,
1125                     (caddr_t)&bad))
1126                         syslog(LOG_ERR, "can't send reply");
1127                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1128                 return;
1129         case MOUNTPROC_DUMP:
1130                 if (!svc_sendreply(transp, (xdrproc_t)xdr_mlist, (caddr_t)NULL))
1131                         syslog(LOG_ERR, "can't send reply");
1132                 else if (dolog)
1133                         syslog(LOG_NOTICE,
1134                             "dump request succeeded from %s",
1135                             numerichost);
1136                 return;
1137         case MOUNTPROC_UMNT:
1138                 if (sport >= IPPORT_RESERVED && resvport_only) {
1139                         syslog(LOG_NOTICE,
1140                             "umount request from %s from unprivileged port",
1141                             numerichost);
1142                         svcerr_weakauth(transp);
1143                         return;
1144                 }
1145                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
1146                         syslog(LOG_NOTICE, "undecodable umount request from %s",
1147                             numerichost);
1148                         svcerr_decode(transp);
1149                         return;
1150                 }
1151                 if (realpath(rpcpath, dirpath) == NULL) {
1152                         syslog(LOG_NOTICE, "umount request from %s "
1153                             "for non existent path %s",
1154                             numerichost, dirpath);
1155                 }
1156                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL))
1157                         syslog(LOG_ERR, "can't send reply");
1158                 if (!lookup_failed)
1159                         del_mlist(host, dirpath);
1160                 del_mlist(numerichost, dirpath);
1161                 if (dolog)
1162                         syslog(LOG_NOTICE,
1163                             "umount request succeeded from %s for %s",
1164                             numerichost, dirpath);
1165                 return;
1166         case MOUNTPROC_UMNTALL:
1167                 if (sport >= IPPORT_RESERVED && resvport_only) {
1168                         syslog(LOG_NOTICE,
1169                             "umountall request from %s from unprivileged port",
1170                             numerichost);
1171                         svcerr_weakauth(transp);
1172                         return;
1173                 }
1174                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL))
1175                         syslog(LOG_ERR, "can't send reply");
1176                 if (!lookup_failed)
1177                         del_mlist(host, NULL);
1178                 del_mlist(numerichost, NULL);
1179                 if (dolog)
1180                         syslog(LOG_NOTICE,
1181                             "umountall request succeeded from %s",
1182                             numerichost);
1183                 return;
1184         case MOUNTPROC_EXPORT:
1185                 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, (caddr_t)NULL))
1186                         if (!svc_sendreply(transp, (xdrproc_t)xdr_explist_brief,
1187                             (caddr_t)NULL))
1188                                 syslog(LOG_ERR, "can't send reply");
1189                 if (dolog)
1190                         syslog(LOG_NOTICE,
1191                             "export request succeeded from %s",
1192                             numerichost);
1193                 return;
1194         default:
1195                 svcerr_noproc(transp);
1196                 return;
1197         }
1198 }
1199
1200 /*
1201  * Xdr conversion for a dirpath string
1202  */
1203 static int
1204 xdr_dir(XDR *xdrsp, char *dirp)
1205 {
1206         return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
1207 }
1208
1209 /*
1210  * Xdr routine to generate file handle reply
1211  */
1212 static int
1213 xdr_fhs(XDR *xdrsp, caddr_t cp)
1214 {
1215         struct fhreturn *fhrp = (struct fhreturn *)cp;
1216         u_long ok = 0, len, auth;
1217         int i;
1218
1219         if (!xdr_long(xdrsp, &ok))
1220                 return (0);
1221         switch (fhrp->fhr_vers) {
1222         case 1:
1223                 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH));
1224         case 3:
1225                 len = NFSX_V3FH;
1226                 if (!xdr_long(xdrsp, &len))
1227                         return (0);
1228                 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len))
1229                         return (0);
1230                 if (fhrp->fhr_numsecflavors) {
1231                         if (!xdr_int(xdrsp, &fhrp->fhr_numsecflavors))
1232                                 return (0);
1233                         for (i = 0; i < fhrp->fhr_numsecflavors; i++)
1234                                 if (!xdr_int(xdrsp, &fhrp->fhr_secflavors[i]))
1235                                         return (0);
1236                         return (1);
1237                 } else {
1238                         auth = AUTH_SYS;
1239                         len = 1;
1240                         if (!xdr_long(xdrsp, &len))
1241                                 return (0);
1242                         return (xdr_long(xdrsp, &auth));
1243                 }
1244         };
1245         return (0);
1246 }
1247
1248 static int
1249 xdr_mlist(XDR *xdrsp, caddr_t cp __unused)
1250 {
1251         struct mountlist *mlp;
1252         int true = 1;
1253         int false = 0;
1254         char *strp;
1255
1256         mlp = mlhead;
1257         while (mlp) {
1258                 if (!xdr_bool(xdrsp, &true))
1259                         return (0);
1260                 strp = &mlp->ml_host[0];
1261                 if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
1262                         return (0);
1263                 strp = &mlp->ml_dirp[0];
1264                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1265                         return (0);
1266                 mlp = mlp->ml_next;
1267         }
1268         if (!xdr_bool(xdrsp, &false))
1269                 return (0);
1270         return (1);
1271 }
1272
1273 /*
1274  * Xdr conversion for export list
1275  */
1276 static int
1277 xdr_explist_common(XDR *xdrsp, caddr_t cp __unused, int brief)
1278 {
1279         struct exportlist *ep;
1280         int false = 0;
1281         int putdef;
1282         sigset_t sighup_mask;
1283
1284         sigemptyset(&sighup_mask);
1285         sigaddset(&sighup_mask, SIGHUP);
1286         sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
1287         ep = exphead;
1288         while (ep) {
1289                 putdef = 0;
1290                 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir,
1291                                &putdef, brief))
1292                         goto errout;
1293                 if (ep->ex_defdir && putdef == 0 &&
1294                         put_exlist(ep->ex_defdir, xdrsp, (struct dirlist *)NULL,
1295                         &putdef, brief))
1296                         goto errout;
1297                 ep = ep->ex_next;
1298         }
1299         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1300         if (!xdr_bool(xdrsp, &false))
1301                 return (0);
1302         return (1);
1303 errout:
1304         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1305         return (0);
1306 }
1307
1308 /*
1309  * Called from xdr_explist() to traverse the tree and export the
1310  * directory paths.
1311  */
1312 static int
1313 put_exlist(struct dirlist *dp, XDR *xdrsp, struct dirlist *adp, int *putdefp,
1314         int brief)
1315 {
1316         struct grouplist *grp;
1317         struct hostlist *hp;
1318         int true = 1;
1319         int false = 0;
1320         int gotalldir = 0;
1321         char *strp;
1322
1323         if (dp) {
1324                 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp, brief))
1325                         return (1);
1326                 if (!xdr_bool(xdrsp, &true))
1327                         return (1);
1328                 strp = dp->dp_dirp;
1329                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1330                         return (1);
1331                 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) {
1332                         gotalldir = 1;
1333                         *putdefp = 1;
1334                 }
1335                 if (brief) {
1336                         if (!xdr_bool(xdrsp, &true))
1337                                 return (1);
1338                         strp = "(...)";
1339                         if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1340                                 return (1);
1341                 } else if ((dp->dp_flag & DP_DEFSET) == 0 &&
1342                     (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) {
1343                         hp = dp->dp_hosts;
1344                         while (hp) {
1345                                 grp = hp->ht_grp;
1346                                 if (grp->gr_type == GT_HOST) {
1347                                         if (!xdr_bool(xdrsp, &true))
1348                                                 return (1);
1349                                         strp = grp->gr_ptr.gt_addrinfo->ai_canonname;
1350                                         if (!xdr_string(xdrsp, &strp,
1351                                             MNTNAMLEN))
1352                                                 return (1);
1353                                 } else if (grp->gr_type == GT_NET) {
1354                                         if (!xdr_bool(xdrsp, &true))
1355                                                 return (1);
1356                                         strp = grp->gr_ptr.gt_net.nt_name;
1357                                         if (!xdr_string(xdrsp, &strp,
1358                                             MNTNAMLEN))
1359                                                 return (1);
1360                                 }
1361                                 hp = hp->ht_next;
1362                                 if (gotalldir && hp == (struct hostlist *)NULL) {
1363                                         hp = adp->dp_hosts;
1364                                         gotalldir = 0;
1365                                 }
1366                         }
1367                 }
1368                 if (!xdr_bool(xdrsp, &false))
1369                         return (1);
1370                 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp, brief))
1371                         return (1);
1372         }
1373         return (0);
1374 }
1375
1376 static int
1377 xdr_explist(XDR *xdrsp, caddr_t cp)
1378 {
1379
1380         return xdr_explist_common(xdrsp, cp, 0);
1381 }
1382
1383 static int
1384 xdr_explist_brief(XDR *xdrsp, caddr_t cp)
1385 {
1386
1387         return xdr_explist_common(xdrsp, cp, 1);
1388 }
1389
1390 static char *line;
1391 static size_t linesize;
1392 static FILE *exp_file;
1393
1394 /*
1395  * Get the export list from one, currently open file
1396  */
1397 static void
1398 get_exportlist_one(void)
1399 {
1400         struct exportlist *ep, *ep2;
1401         struct grouplist *grp, *tgrp;
1402         struct exportlist **epp;
1403         struct dirlist *dirhead;
1404         struct statfs fsb;
1405         struct xucred anon;
1406         char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc;
1407         int len, has_host, exflags, got_nondir, dirplen, netgrp;
1408
1409         v4root_phase = 0;
1410         dirhead = (struct dirlist *)NULL;
1411         while (get_line()) {
1412                 if (debug)
1413                         warnx("got line %s", line);
1414                 cp = line;
1415                 nextfield(&cp, &endcp);
1416                 if (*cp == '#')
1417                         goto nextline;
1418
1419                 /*
1420                  * Set defaults.
1421                  */
1422                 has_host = FALSE;
1423                 anon = def_anon;
1424                 exflags = MNT_EXPORTED;
1425                 got_nondir = 0;
1426                 opt_flags = 0;
1427                 ep = (struct exportlist *)NULL;
1428                 dirp = NULL;
1429
1430                 /*
1431                  * Handle the V4 root dir.
1432                  */
1433                 if (*cp == 'V' && *(cp + 1) == '4' && *(cp + 2) == ':') {
1434                         /*
1435                          * V4: just indicates that it is the v4 root point,
1436                          * so skip over that and set v4root_phase.
1437                          */
1438                         if (v4root_phase > 0) {
1439                                 syslog(LOG_ERR, "V4:duplicate line, ignored");
1440                                 goto nextline;
1441                         }
1442                         v4root_phase = 1;
1443                         cp += 3;
1444                         nextfield(&cp, &endcp);
1445                 }
1446
1447                 /*
1448                  * Create new exports list entry
1449                  */
1450                 len = endcp-cp;
1451                 tgrp = grp = get_grp();
1452                 while (len > 0) {
1453                         if (len > MNTNAMLEN) {
1454                             getexp_err(ep, tgrp);
1455                             goto nextline;
1456                         }
1457                         if (*cp == '-') {
1458                             if (ep == (struct exportlist *)NULL) {
1459                                 getexp_err(ep, tgrp);
1460                                 goto nextline;
1461                             }
1462                             if (debug)
1463                                 warnx("doing opt %s", cp);
1464                             got_nondir = 1;
1465                             if (do_opt(&cp, &endcp, ep, grp, &has_host,
1466                                 &exflags, &anon)) {
1467                                 getexp_err(ep, tgrp);
1468                                 goto nextline;
1469                             }
1470                         } else if (*cp == '/') {
1471                             savedc = *endcp;
1472                             *endcp = '\0';
1473                             if (v4root_phase > 1) {
1474                                     if (dirp != NULL) {
1475                                         syslog(LOG_ERR, "Multiple V4 dirs");
1476                                         getexp_err(ep, tgrp);
1477                                         goto nextline;
1478                                     }
1479                             }
1480                             if (check_dirpath(cp) &&
1481                                 statfs(cp, &fsb) >= 0) {
1482                                 if ((fsb.f_flags & MNT_AUTOMOUNTED) != 0)
1483                                     syslog(LOG_ERR, "Warning: exporting of "
1484                                         "automounted fs %s not supported", cp);
1485                                 if (got_nondir) {
1486                                     syslog(LOG_ERR, "dirs must be first");
1487                                     getexp_err(ep, tgrp);
1488                                     goto nextline;
1489                                 }
1490                                 if (v4root_phase == 1) {
1491                                     if (dirp != NULL) {
1492                                         syslog(LOG_ERR, "Multiple V4 dirs");
1493                                         getexp_err(ep, tgrp);
1494                                         goto nextline;
1495                                     }
1496                                     if (strlen(v4root_dirpath) == 0) {
1497                                         strlcpy(v4root_dirpath, cp,
1498                                             sizeof (v4root_dirpath));
1499                                     } else if (strcmp(v4root_dirpath, cp)
1500                                         != 0) {
1501                                         syslog(LOG_ERR,
1502                                             "different V4 dirpath %s", cp);
1503                                         getexp_err(ep, tgrp);
1504                                         goto nextline;
1505                                     }
1506                                     dirp = cp;
1507                                     v4root_phase = 2;
1508                                     got_nondir = 1;
1509                                     ep = get_exp();
1510                                 } else {
1511                                     if (ep) {
1512                                         if (ep->ex_fs.val[0] !=
1513                                             fsb.f_fsid.val[0] ||
1514                                             ep->ex_fs.val[1] !=
1515                                             fsb.f_fsid.val[1]) {
1516                                                 getexp_err(ep, tgrp);
1517                                                 goto nextline;
1518                                         }
1519                                     } else {
1520                                         /*
1521                                          * See if this directory is already
1522                                          * in the list.
1523                                          */
1524                                         ep = ex_search(&fsb.f_fsid);
1525                                         if (ep == (struct exportlist *)NULL) {
1526                                             ep = get_exp();
1527                                             ep->ex_fs = fsb.f_fsid;
1528                                             ep->ex_fsdir = (char *)malloc
1529                                                 (strlen(fsb.f_mntonname) + 1);
1530                                             if (ep->ex_fsdir)
1531                                                 strcpy(ep->ex_fsdir,
1532                                                     fsb.f_mntonname);
1533                                             else
1534                                                 out_of_mem();
1535                                             if (debug)
1536                                                 warnx(
1537                                                   "making new ep fs=0x%x,0x%x",
1538                                                   fsb.f_fsid.val[0],
1539                                                   fsb.f_fsid.val[1]);
1540                                         } else if (debug)
1541                                             warnx("found ep fs=0x%x,0x%x",
1542                                                 fsb.f_fsid.val[0],
1543                                                 fsb.f_fsid.val[1]);
1544                                     }
1545
1546                                     /*
1547                                      * Add dirpath to export mount point.
1548                                      */
1549                                     dirp = add_expdir(&dirhead, cp, len);
1550                                     dirplen = len;
1551                                 }
1552                             } else {
1553                                 getexp_err(ep, tgrp);
1554                                 goto nextline;
1555                             }
1556                             *endcp = savedc;
1557                         } else {
1558                             savedc = *endcp;
1559                             *endcp = '\0';
1560                             got_nondir = 1;
1561                             if (ep == (struct exportlist *)NULL) {
1562                                 getexp_err(ep, tgrp);
1563                                 goto nextline;
1564                             }
1565
1566                             /*
1567                              * Get the host or netgroup.
1568                              */
1569                             setnetgrent(cp);
1570                             netgrp = getnetgrent(&hst, &usr, &dom);
1571                             do {
1572                                 if (has_host) {
1573                                     grp->gr_next = get_grp();
1574                                     grp = grp->gr_next;
1575                                 }
1576                                 if (netgrp) {
1577                                     if (hst == 0) {
1578                                         syslog(LOG_ERR,
1579                                 "null hostname in netgroup %s, skipping", cp);
1580                                         grp->gr_type = GT_IGNORE;
1581                                     } else if (get_host(hst, grp, tgrp)) {
1582                                         syslog(LOG_ERR,
1583                         "bad host %s in netgroup %s, skipping", hst, cp);
1584                                         grp->gr_type = GT_IGNORE;
1585                                     }
1586                                 } else if (get_host(cp, grp, tgrp)) {
1587                                     syslog(LOG_ERR, "bad host %s, skipping", cp);
1588                                     grp->gr_type = GT_IGNORE;
1589                                 }
1590                                 has_host = TRUE;
1591                             } while (netgrp && getnetgrent(&hst, &usr, &dom));
1592                             endnetgrent();
1593                             *endcp = savedc;
1594                         }
1595                         cp = endcp;
1596                         nextfield(&cp, &endcp);
1597                         len = endcp - cp;
1598                 }
1599                 if (check_options(dirhead)) {
1600                         getexp_err(ep, tgrp);
1601                         goto nextline;
1602                 }
1603                 if (!has_host) {
1604                         grp->gr_type = GT_DEFAULT;
1605                         if (debug)
1606                                 warnx("adding a default entry");
1607
1608                 /*
1609                  * Don't allow a network export coincide with a list of
1610                  * host(s) on the same line.
1611                  */
1612                 } else if ((opt_flags & OP_NET) && tgrp->gr_next) {
1613                         syslog(LOG_ERR, "network/host conflict");
1614                         getexp_err(ep, tgrp);
1615                         goto nextline;
1616
1617                 /*
1618                  * If an export list was specified on this line, make sure
1619                  * that we have at least one valid entry, otherwise skip it.
1620                  */
1621                 } else {
1622                         grp = tgrp;
1623                         while (grp && grp->gr_type == GT_IGNORE)
1624                                 grp = grp->gr_next;
1625                         if (! grp) {
1626                             getexp_err(ep, tgrp);
1627                             goto nextline;
1628                         }
1629                 }
1630
1631                 if (v4root_phase == 1) {
1632                         syslog(LOG_ERR, "V4:root, no dirp, ignored");
1633                         getexp_err(ep, tgrp);
1634                         goto nextline;
1635                 }
1636
1637                 /*
1638                  * Loop through hosts, pushing the exports into the kernel.
1639                  * After loop, tgrp points to the start of the list and
1640                  * grp points to the last entry in the list.
1641                  */
1642                 grp = tgrp;
1643                 do {
1644                         if (do_mount(ep, grp, exflags, &anon, dirp, dirplen,
1645                             &fsb)) {
1646                                 getexp_err(ep, tgrp);
1647                                 goto nextline;
1648                         }
1649                 } while (grp->gr_next && (grp = grp->gr_next));
1650
1651                 /*
1652                  * For V4: don't enter in mount lists.
1653                  */
1654                 if (v4root_phase > 0 && v4root_phase <= 2) {
1655                         /*
1656                          * Since these structures aren't used by mountd,
1657                          * free them up now.
1658                          */
1659                         if (ep != NULL)
1660                                 free_exp(ep);
1661                         while (tgrp != NULL) {
1662                                 grp = tgrp;
1663                                 tgrp = tgrp->gr_next;
1664                                 free_grp(grp);
1665                         }
1666                         goto nextline;
1667                 }
1668
1669                 /*
1670                  * Success. Update the data structures.
1671                  */
1672                 if (has_host) {
1673                         hang_dirp(dirhead, tgrp, ep, opt_flags);
1674                         grp->gr_next = grphead;
1675                         grphead = tgrp;
1676                 } else {
1677                         hang_dirp(dirhead, (struct grouplist *)NULL, ep,
1678                                 opt_flags);
1679                         free_grp(grp);
1680                 }
1681                 dirhead = (struct dirlist *)NULL;
1682                 if ((ep->ex_flag & EX_LINKED) == 0) {
1683                         ep2 = exphead;
1684                         epp = &exphead;
1685
1686                         /*
1687                          * Insert in the list in alphabetical order.
1688                          */
1689                         while (ep2 && strcmp(ep2->ex_fsdir, ep->ex_fsdir) < 0) {
1690                                 epp = &ep2->ex_next;
1691                                 ep2 = ep2->ex_next;
1692                         }
1693                         if (ep2)
1694                                 ep->ex_next = ep2;
1695                         *epp = ep;
1696                         ep->ex_flag |= EX_LINKED;
1697                 }
1698 nextline:
1699                 v4root_phase = 0;
1700                 if (dirhead) {
1701                         free_dir(dirhead);
1702                         dirhead = (struct dirlist *)NULL;
1703                 }
1704         }
1705 }
1706
1707 /*
1708  * Get the export list from all specified files
1709  */
1710 static void
1711 get_exportlist(void)
1712 {
1713         struct exportlist *ep, *ep2;
1714         struct grouplist *grp, *tgrp;
1715         struct export_args export;
1716         struct iovec *iov;
1717         struct statfs *fsp, *mntbufp;
1718         struct xvfsconf vfc;
1719         char errmsg[255];
1720         int num, i;
1721         int iovlen;
1722         int done;
1723         struct nfsex_args eargs;
1724
1725         if (suspend_nfsd != 0)
1726                 (void)nfssvc(NFSSVC_SUSPENDNFSD, NULL);
1727         v4root_dirpath[0] = '\0';
1728         bzero(&export, sizeof(export));
1729         export.ex_flags = MNT_DELEXPORT;
1730         iov = NULL;
1731         iovlen = 0;
1732         bzero(errmsg, sizeof(errmsg));
1733
1734         /*
1735          * First, get rid of the old list
1736          */
1737         ep = exphead;
1738         while (ep) {
1739                 ep2 = ep;
1740                 ep = ep->ex_next;
1741                 free_exp(ep2);
1742         }
1743         exphead = (struct exportlist *)NULL;
1744
1745         grp = grphead;
1746         while (grp) {
1747                 tgrp = grp;
1748                 grp = grp->gr_next;
1749                 free_grp(tgrp);
1750         }
1751         grphead = (struct grouplist *)NULL;
1752
1753         /*
1754          * and the old V4 root dir.
1755          */
1756         bzero(&eargs, sizeof (eargs));
1757         eargs.export.ex_flags = MNT_DELEXPORT;
1758         if (nfssvc(NFSSVC_V4ROOTEXPORT, (caddr_t)&eargs) < 0 &&
1759             errno != ENOENT)
1760                 syslog(LOG_ERR, "Can't delete exports for V4:");
1761
1762         /*
1763          * and clear flag that notes if a public fh has been exported.
1764          */
1765         has_publicfh = 0;
1766
1767         /*
1768          * And delete exports that are in the kernel for all local
1769          * filesystems.
1770          * XXX: Should know how to handle all local exportable filesystems.
1771          */
1772         num = getmntinfo(&mntbufp, MNT_NOWAIT);
1773
1774         if (num > 0) {
1775                 build_iovec(&iov, &iovlen, "fstype", NULL, 0);
1776                 build_iovec(&iov, &iovlen, "fspath", NULL, 0);
1777                 build_iovec(&iov, &iovlen, "from", NULL, 0);
1778                 build_iovec(&iov, &iovlen, "update", NULL, 0);
1779                 build_iovec(&iov, &iovlen, "export", &export, sizeof(export));
1780                 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
1781         }
1782
1783         for (i = 0; i < num; i++) {
1784                 fsp = &mntbufp[i];
1785                 if (getvfsbyname(fsp->f_fstypename, &vfc) != 0) {
1786                         syslog(LOG_ERR, "getvfsbyname() failed for %s",
1787                             fsp->f_fstypename);
1788                         continue;
1789                 }
1790
1791                 /*
1792                  * We do not need to delete "export" flag from
1793                  * filesystems that do not have it set.
1794                  */
1795                 if (!(fsp->f_flags & MNT_EXPORTED))
1796                     continue;
1797                 /*
1798                  * Do not delete export for network filesystem by
1799                  * passing "export" arg to nmount().
1800                  * It only makes sense to do this for local filesystems.
1801                  */
1802                 if (vfc.vfc_flags & VFCF_NETWORK)
1803                         continue;
1804
1805                 iov[1].iov_base = fsp->f_fstypename;
1806                 iov[1].iov_len = strlen(fsp->f_fstypename) + 1;
1807                 iov[3].iov_base = fsp->f_mntonname;
1808                 iov[3].iov_len = strlen(fsp->f_mntonname) + 1;
1809                 iov[5].iov_base = fsp->f_mntfromname;
1810                 iov[5].iov_len = strlen(fsp->f_mntfromname) + 1;
1811                 errmsg[0] = '\0';
1812
1813                 /*
1814                  * EXDEV is returned when path exists but is not a
1815                  * mount point.  May happens if raced with unmount.
1816                  */
1817                 if (nmount(iov, iovlen, fsp->f_flags) < 0 &&
1818                     errno != ENOENT && errno != ENOTSUP && errno != EXDEV) {
1819                         syslog(LOG_ERR,
1820                             "can't delete exports for %s: %m %s",
1821                             fsp->f_mntonname, errmsg);
1822                 }
1823         }
1824
1825         if (iov != NULL) {
1826                 /* Free strings allocated by strdup() in getmntopts.c */
1827                 free(iov[0].iov_base); /* fstype */
1828                 free(iov[2].iov_base); /* fspath */
1829                 free(iov[4].iov_base); /* from */
1830                 free(iov[6].iov_base); /* update */
1831                 free(iov[8].iov_base); /* export */
1832                 free(iov[10].iov_base); /* errmsg */
1833
1834                 /* free iov, allocated by realloc() */
1835                 free(iov);
1836                 iovlen = 0;
1837         }
1838
1839         /*
1840          * Read in the exports file and build the list, calling
1841          * nmount() as we go along to push the export rules into the kernel.
1842          */
1843         done = 0;
1844         for (i = 0; exnames[i] != NULL; i++) {
1845                 if (debug)
1846                         warnx("reading exports from %s", exnames[i]);
1847                 if ((exp_file = fopen(exnames[i], "r")) == NULL) {
1848                         syslog(LOG_WARNING, "can't open %s", exnames[i]);
1849                         continue;
1850                 }
1851                 get_exportlist_one();
1852                 fclose(exp_file);
1853                 done++;
1854         }
1855         if (done == 0) {
1856                 syslog(LOG_ERR, "can't open any exports file");
1857                 exit(2);
1858         }
1859
1860         /*
1861          * If there was no public fh, clear any previous one set.
1862          */
1863         if (has_publicfh == 0)
1864                 (void) nfssvc(NFSSVC_NOPUBLICFH, NULL);
1865
1866         /* Resume the nfsd. If they weren't suspended, this is harmless. */
1867         (void)nfssvc(NFSSVC_RESUMENFSD, NULL);
1868 }
1869
1870 /*
1871  * Allocate an export list element
1872  */
1873 static struct exportlist *
1874 get_exp(void)
1875 {
1876         struct exportlist *ep;
1877
1878         ep = (struct exportlist *)calloc(1, sizeof (struct exportlist));
1879         if (ep == (struct exportlist *)NULL)
1880                 out_of_mem();
1881         return (ep);
1882 }
1883
1884 /*
1885  * Allocate a group list element
1886  */
1887 static struct grouplist *
1888 get_grp(void)
1889 {
1890         struct grouplist *gp;
1891
1892         gp = (struct grouplist *)calloc(1, sizeof (struct grouplist));
1893         if (gp == (struct grouplist *)NULL)
1894                 out_of_mem();
1895         return (gp);
1896 }
1897
1898 /*
1899  * Clean up upon an error in get_exportlist().
1900  */
1901 static void
1902 getexp_err(struct exportlist *ep, struct grouplist *grp)
1903 {
1904         struct grouplist *tgrp;
1905
1906         if (!(opt_flags & OP_QUIET))
1907                 syslog(LOG_ERR, "bad exports list line %s", line);
1908         if (ep && (ep->ex_flag & EX_LINKED) == 0)
1909                 free_exp(ep);
1910         while (grp) {
1911                 tgrp = grp;
1912                 grp = grp->gr_next;
1913                 free_grp(tgrp);
1914         }
1915 }
1916
1917 /*
1918  * Search the export list for a matching fs.
1919  */
1920 static struct exportlist *
1921 ex_search(fsid_t *fsid)
1922 {
1923         struct exportlist *ep;
1924
1925         ep = exphead;
1926         while (ep) {
1927                 if (ep->ex_fs.val[0] == fsid->val[0] &&
1928                     ep->ex_fs.val[1] == fsid->val[1])
1929                         return (ep);
1930                 ep = ep->ex_next;
1931         }
1932         return (ep);
1933 }
1934
1935 /*
1936  * Add a directory path to the list.
1937  */
1938 static char *
1939 add_expdir(struct dirlist **dpp, char *cp, int len)
1940 {
1941         struct dirlist *dp;
1942
1943         dp = (struct dirlist *)malloc(sizeof (struct dirlist) + len);
1944         if (dp == (struct dirlist *)NULL)
1945                 out_of_mem();
1946         dp->dp_left = *dpp;
1947         dp->dp_right = (struct dirlist *)NULL;
1948         dp->dp_flag = 0;
1949         dp->dp_hosts = (struct hostlist *)NULL;
1950         strcpy(dp->dp_dirp, cp);
1951         *dpp = dp;
1952         return (dp->dp_dirp);
1953 }
1954
1955 /*
1956  * Hang the dir list element off the dirpath binary tree as required
1957  * and update the entry for host.
1958  */
1959 static void
1960 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep,
1961         int flags)
1962 {
1963         struct hostlist *hp;
1964         struct dirlist *dp2;
1965
1966         if (flags & OP_ALLDIRS) {
1967                 if (ep->ex_defdir)
1968                         free((caddr_t)dp);
1969                 else
1970                         ep->ex_defdir = dp;
1971                 if (grp == (struct grouplist *)NULL) {
1972                         ep->ex_defdir->dp_flag |= DP_DEFSET;
1973                         /* Save the default security flavors list. */
1974                         ep->ex_defnumsecflavors = ep->ex_numsecflavors;
1975                         if (ep->ex_numsecflavors > 0)
1976                                 memcpy(ep->ex_defsecflavors, ep->ex_secflavors,
1977                                     sizeof(ep->ex_secflavors));
1978                 } else while (grp) {
1979                         hp = get_ht();
1980                         hp->ht_grp = grp;
1981                         hp->ht_next = ep->ex_defdir->dp_hosts;
1982                         ep->ex_defdir->dp_hosts = hp;
1983                         /* Save the security flavors list for this host set. */
1984                         grp->gr_numsecflavors = ep->ex_numsecflavors;
1985                         if (ep->ex_numsecflavors > 0)
1986                                 memcpy(grp->gr_secflavors, ep->ex_secflavors,
1987                                     sizeof(ep->ex_secflavors));
1988                         grp = grp->gr_next;
1989                 }
1990         } else {
1991
1992                 /*
1993                  * Loop through the directories adding them to the tree.
1994                  */
1995                 while (dp) {
1996                         dp2 = dp->dp_left;
1997                         add_dlist(&ep->ex_dirl, dp, grp, flags, ep);
1998                         dp = dp2;
1999                 }
2000         }
2001 }
2002
2003 /*
2004  * Traverse the binary tree either updating a node that is already there
2005  * for the new directory or adding the new node.
2006  */
2007 static void
2008 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp,
2009         int flags, struct exportlist *ep)
2010 {
2011         struct dirlist *dp;
2012         struct hostlist *hp;
2013         int cmp;
2014
2015         dp = *dpp;
2016         if (dp) {
2017                 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp);
2018                 if (cmp > 0) {
2019                         add_dlist(&dp->dp_left, newdp, grp, flags, ep);
2020                         return;
2021                 } else if (cmp < 0) {
2022                         add_dlist(&dp->dp_right, newdp, grp, flags, ep);
2023                         return;
2024                 } else
2025                         free((caddr_t)newdp);
2026         } else {
2027                 dp = newdp;
2028                 dp->dp_left = (struct dirlist *)NULL;
2029                 *dpp = dp;
2030         }
2031         if (grp) {
2032
2033                 /*
2034                  * Hang all of the host(s) off of the directory point.
2035                  */
2036                 do {
2037                         hp = get_ht();
2038                         hp->ht_grp = grp;
2039                         hp->ht_next = dp->dp_hosts;
2040                         dp->dp_hosts = hp;
2041                         /* Save the security flavors list for this host set. */
2042                         grp->gr_numsecflavors = ep->ex_numsecflavors;
2043                         if (ep->ex_numsecflavors > 0)
2044                                 memcpy(grp->gr_secflavors, ep->ex_secflavors,
2045                                     sizeof(ep->ex_secflavors));
2046                         grp = grp->gr_next;
2047                 } while (grp);
2048         } else {
2049                 dp->dp_flag |= DP_DEFSET;
2050                 /* Save the default security flavors list. */
2051                 ep->ex_defnumsecflavors = ep->ex_numsecflavors;
2052                 if (ep->ex_numsecflavors > 0)
2053                         memcpy(ep->ex_defsecflavors, ep->ex_secflavors,
2054                             sizeof(ep->ex_secflavors));
2055         }
2056 }
2057
2058 /*
2059  * Search for a dirpath on the export point.
2060  */
2061 static struct dirlist *
2062 dirp_search(struct dirlist *dp, char *dirp)
2063 {
2064         int cmp;
2065
2066         if (dp) {
2067                 cmp = strcmp(dp->dp_dirp, dirp);
2068                 if (cmp > 0)
2069                         return (dirp_search(dp->dp_left, dirp));
2070                 else if (cmp < 0)
2071                         return (dirp_search(dp->dp_right, dirp));
2072                 else
2073                         return (dp);
2074         }
2075         return (dp);
2076 }
2077
2078 /*
2079  * Scan for a host match in a directory tree.
2080  */
2081 static int
2082 chk_host(struct dirlist *dp, struct sockaddr *saddr, int *defsetp,
2083         int *hostsetp, int *numsecflavors, int **secflavorsp)
2084 {
2085         struct hostlist *hp;
2086         struct grouplist *grp;
2087         struct addrinfo *ai;
2088
2089         if (dp) {
2090                 if (dp->dp_flag & DP_DEFSET)
2091                         *defsetp = dp->dp_flag;
2092                 hp = dp->dp_hosts;
2093                 while (hp) {
2094                         grp = hp->ht_grp;
2095                         switch (grp->gr_type) {
2096                         case GT_HOST:
2097                                 ai = grp->gr_ptr.gt_addrinfo;
2098                                 for (; ai; ai = ai->ai_next) {
2099                                         if (!sacmp(ai->ai_addr, saddr, NULL)) {
2100                                                 *hostsetp =
2101                                                     (hp->ht_flag | DP_HOSTSET);
2102                                                 if (numsecflavors != NULL) {
2103                                                         *numsecflavors =
2104                                                             grp->gr_numsecflavors;
2105                                                         *secflavorsp =
2106                                                             grp->gr_secflavors;
2107                                                 }
2108                                                 return (1);
2109                                         }
2110                                 }
2111                                 break;
2112                         case GT_NET:
2113                                 if (!sacmp(saddr, (struct sockaddr *)
2114                                     &grp->gr_ptr.gt_net.nt_net,
2115                                     (struct sockaddr *)
2116                                     &grp->gr_ptr.gt_net.nt_mask)) {
2117                                         *hostsetp = (hp->ht_flag | DP_HOSTSET);
2118                                         if (numsecflavors != NULL) {
2119                                                 *numsecflavors =
2120                                                     grp->gr_numsecflavors;
2121                                                 *secflavorsp =
2122                                                     grp->gr_secflavors;
2123                                         }
2124                                         return (1);
2125                                 }
2126                                 break;
2127                         }
2128                         hp = hp->ht_next;
2129                 }
2130         }
2131         return (0);
2132 }
2133
2134 /*
2135  * Scan tree for a host that matches the address.
2136  */
2137 static int
2138 scan_tree(struct dirlist *dp, struct sockaddr *saddr)
2139 {
2140         int defset, hostset;
2141
2142         if (dp) {
2143                 if (scan_tree(dp->dp_left, saddr))
2144                         return (1);
2145                 if (chk_host(dp, saddr, &defset, &hostset, NULL, NULL))
2146                         return (1);
2147                 if (scan_tree(dp->dp_right, saddr))
2148                         return (1);
2149         }
2150         return (0);
2151 }
2152
2153 /*
2154  * Traverse the dirlist tree and free it up.
2155  */
2156 static void
2157 free_dir(struct dirlist *dp)
2158 {
2159
2160         if (dp) {
2161                 free_dir(dp->dp_left);
2162                 free_dir(dp->dp_right);
2163                 free_host(dp->dp_hosts);
2164                 free((caddr_t)dp);
2165         }
2166 }
2167
2168 /*
2169  * Parse a colon separated list of security flavors
2170  */
2171 static int
2172 parsesec(char *seclist, struct exportlist *ep)
2173 {
2174         char *cp, savedc;
2175         int flavor;
2176
2177         ep->ex_numsecflavors = 0;
2178         for (;;) {
2179                 cp = strchr(seclist, ':');
2180                 if (cp) {
2181                         savedc = *cp;
2182                         *cp = '\0';
2183                 }
2184
2185                 if (!strcmp(seclist, "sys"))
2186                         flavor = AUTH_SYS;
2187                 else if (!strcmp(seclist, "krb5"))
2188                         flavor = RPCSEC_GSS_KRB5;
2189                 else if (!strcmp(seclist, "krb5i"))
2190                         flavor = RPCSEC_GSS_KRB5I;
2191                 else if (!strcmp(seclist, "krb5p"))
2192                         flavor = RPCSEC_GSS_KRB5P;
2193                 else {
2194                         if (cp)
2195                                 *cp = savedc;
2196                         syslog(LOG_ERR, "bad sec flavor: %s", seclist);
2197                         return (1);
2198                 }
2199                 if (ep->ex_numsecflavors == MAXSECFLAVORS) {
2200                         if (cp)
2201                                 *cp = savedc;
2202                         syslog(LOG_ERR, "too many sec flavors: %s", seclist);
2203                         return (1);
2204                 }
2205                 ep->ex_secflavors[ep->ex_numsecflavors] = flavor;
2206                 ep->ex_numsecflavors++;
2207                 if (cp) {
2208                         *cp = savedc;
2209                         seclist = cp + 1;
2210                 } else {
2211                         break;
2212                 }
2213         }
2214         return (0);
2215 }
2216
2217 /*
2218  * Parse the option string and update fields.
2219  * Option arguments may either be -<option>=<value> or
2220  * -<option> <value>
2221  */
2222 static int
2223 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp,
2224         int *has_hostp, int *exflagsp, struct xucred *cr)
2225 {
2226         char *cpoptarg, *cpoptend;
2227         char *cp, *endcp, *cpopt, savedc, savedc2;
2228         int allflag, usedarg;
2229
2230         savedc2 = '\0';
2231         cpopt = *cpp;
2232         cpopt++;
2233         cp = *endcpp;
2234         savedc = *cp;
2235         *cp = '\0';
2236         while (cpopt && *cpopt) {
2237                 allflag = 1;
2238                 usedarg = -2;
2239                 if ((cpoptend = strchr(cpopt, ','))) {
2240                         *cpoptend++ = '\0';
2241                         if ((cpoptarg = strchr(cpopt, '=')))
2242                                 *cpoptarg++ = '\0';
2243                 } else {
2244                         if ((cpoptarg = strchr(cpopt, '=')))
2245                                 *cpoptarg++ = '\0';
2246                         else {
2247                                 *cp = savedc;
2248                                 nextfield(&cp, &endcp);
2249                                 **endcpp = '\0';
2250                                 if (endcp > cp && *cp != '-') {
2251                                         cpoptarg = cp;
2252                                         savedc2 = *endcp;
2253                                         *endcp = '\0';
2254                                         usedarg = 0;
2255                                 }
2256                         }
2257                 }
2258                 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) {
2259                         *exflagsp |= MNT_EXRDONLY;
2260                 } else if (cpoptarg && (!strcmp(cpopt, "maproot") ||
2261                     !(allflag = strcmp(cpopt, "mapall")) ||
2262                     !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) {
2263                         usedarg++;
2264                         parsecred(cpoptarg, cr);
2265                         if (allflag == 0) {
2266                                 *exflagsp |= MNT_EXPORTANON;
2267                                 opt_flags |= OP_MAPALL;
2268                         } else
2269                                 opt_flags |= OP_MAPROOT;
2270                 } else if (cpoptarg && (!strcmp(cpopt, "mask") ||
2271                     !strcmp(cpopt, "m"))) {
2272                         if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) {
2273                                 syslog(LOG_ERR, "bad mask: %s", cpoptarg);
2274                                 return (1);
2275                         }
2276                         usedarg++;
2277                         opt_flags |= OP_MASK;
2278                 } else if (cpoptarg && (!strcmp(cpopt, "network") ||
2279                         !strcmp(cpopt, "n"))) {
2280                         if (strchr(cpoptarg, '/') != NULL) {
2281                                 if (debug)
2282                                         fprintf(stderr, "setting OP_MASKLEN\n");
2283                                 opt_flags |= OP_MASKLEN;
2284                         }
2285                         if (grp->gr_type != GT_NULL) {
2286                                 syslog(LOG_ERR, "network/host conflict");
2287                                 return (1);
2288                         } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) {
2289                                 syslog(LOG_ERR, "bad net: %s", cpoptarg);
2290                                 return (1);
2291                         }
2292                         grp->gr_type = GT_NET;
2293                         *has_hostp = 1;
2294                         usedarg++;
2295                         opt_flags |= OP_NET;
2296                 } else if (!strcmp(cpopt, "alldirs")) {
2297                         opt_flags |= OP_ALLDIRS;
2298                 } else if (!strcmp(cpopt, "public")) {
2299                         *exflagsp |= MNT_EXPUBLIC;
2300                 } else if (!strcmp(cpopt, "webnfs")) {
2301                         *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON);
2302                         opt_flags |= OP_MAPALL;
2303                 } else if (cpoptarg && !strcmp(cpopt, "index")) {
2304                         ep->ex_indexfile = strdup(cpoptarg);
2305                 } else if (!strcmp(cpopt, "quiet")) {
2306                         opt_flags |= OP_QUIET;
2307                 } else if (cpoptarg && !strcmp(cpopt, "sec")) {
2308                         if (parsesec(cpoptarg, ep))
2309                                 return (1);
2310                         opt_flags |= OP_SEC;
2311                         usedarg++;
2312                 } else {
2313                         syslog(LOG_ERR, "bad opt %s", cpopt);
2314                         return (1);
2315                 }
2316                 if (usedarg >= 0) {
2317                         *endcp = savedc2;
2318                         **endcpp = savedc;
2319                         if (usedarg > 0) {
2320                                 *cpp = cp;
2321                                 *endcpp = endcp;
2322                         }
2323                         return (0);
2324                 }
2325                 cpopt = cpoptend;
2326         }
2327         **endcpp = savedc;
2328         return (0);
2329 }
2330
2331 /*
2332  * Translate a character string to the corresponding list of network
2333  * addresses for a hostname.
2334  */
2335 static int
2336 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp)
2337 {
2338         struct grouplist *checkgrp;
2339         struct addrinfo *ai, *tai, hints;
2340         int ecode;
2341         char host[NI_MAXHOST];
2342
2343         if (grp->gr_type != GT_NULL) {
2344                 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp);
2345                 return (1);
2346         }
2347         memset(&hints, 0, sizeof hints);
2348         hints.ai_flags = AI_CANONNAME;
2349         hints.ai_protocol = IPPROTO_UDP;
2350         ecode = getaddrinfo(cp, NULL, &hints, &ai);
2351         if (ecode != 0) {
2352                 syslog(LOG_ERR,"can't get address info for host %s", cp);
2353                 return 1;
2354         }
2355         grp->gr_ptr.gt_addrinfo = ai;
2356         while (ai != NULL) {
2357                 if (ai->ai_canonname == NULL) {
2358                         if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host,
2359                             sizeof host, NULL, 0, NI_NUMERICHOST) != 0)
2360                                 strlcpy(host, "?", sizeof(host));
2361                         ai->ai_canonname = strdup(host);
2362                         ai->ai_flags |= AI_CANONNAME;
2363                 }
2364                 if (debug)
2365                         fprintf(stderr, "got host %s\n", ai->ai_canonname);
2366                 /*
2367                  * Sanity check: make sure we don't already have an entry
2368                  * for this host in the grouplist.
2369                  */
2370                 for (checkgrp = tgrp; checkgrp != NULL;
2371                     checkgrp = checkgrp->gr_next) {
2372                         if (checkgrp->gr_type != GT_HOST)
2373                                 continue;
2374                         for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL;
2375                             tai = tai->ai_next) {
2376                                 if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0)
2377                                         continue;
2378                                 if (debug)
2379                                         fprintf(stderr,
2380                                             "ignoring duplicate host %s\n",
2381                                             ai->ai_canonname);
2382                                 grp->gr_type = GT_IGNORE;
2383                                 return (0);
2384                         }
2385                 }
2386                 ai = ai->ai_next;
2387         }
2388         grp->gr_type = GT_HOST;
2389         return (0);
2390 }
2391
2392 /*
2393  * Free up an exports list component
2394  */
2395 static void
2396 free_exp(struct exportlist *ep)
2397 {
2398
2399         if (ep->ex_defdir) {
2400                 free_host(ep->ex_defdir->dp_hosts);
2401                 free((caddr_t)ep->ex_defdir);
2402         }
2403         if (ep->ex_fsdir)
2404                 free(ep->ex_fsdir);
2405         if (ep->ex_indexfile)
2406                 free(ep->ex_indexfile);
2407         free_dir(ep->ex_dirl);
2408         free((caddr_t)ep);
2409 }
2410
2411 /*
2412  * Free hosts.
2413  */
2414 static void
2415 free_host(struct hostlist *hp)
2416 {
2417         struct hostlist *hp2;
2418
2419         while (hp) {
2420                 hp2 = hp;
2421                 hp = hp->ht_next;
2422                 free((caddr_t)hp2);
2423         }
2424 }
2425
2426 static struct hostlist *
2427 get_ht(void)
2428 {
2429         struct hostlist *hp;
2430
2431         hp = (struct hostlist *)malloc(sizeof (struct hostlist));
2432         if (hp == (struct hostlist *)NULL)
2433                 out_of_mem();
2434         hp->ht_next = (struct hostlist *)NULL;
2435         hp->ht_flag = 0;
2436         return (hp);
2437 }
2438
2439 /*
2440  * Out of memory, fatal
2441  */
2442 static void
2443 out_of_mem(void)
2444 {
2445
2446         syslog(LOG_ERR, "out of memory");
2447         exit(2);
2448 }
2449
2450 /*
2451  * Do the nmount() syscall with the update flag to push the export info into
2452  * the kernel.
2453  */
2454 static int
2455 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags,
2456     struct xucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb)
2457 {
2458         struct statfs fsb1;
2459         struct addrinfo *ai;
2460         struct export_args *eap;
2461         char errmsg[255];
2462         char *cp;
2463         int done;
2464         char savedc;
2465         struct iovec *iov;
2466         int i, iovlen;
2467         int ret;
2468         struct nfsex_args nfsea;
2469
2470         eap = &nfsea.export;
2471
2472         cp = NULL;
2473         savedc = '\0';
2474         iov = NULL;
2475         iovlen = 0;
2476         ret = 0;
2477
2478         bzero(eap, sizeof (struct export_args));
2479         bzero(errmsg, sizeof(errmsg));
2480         eap->ex_flags = exflags;
2481         eap->ex_anon = *anoncrp;
2482         eap->ex_indexfile = ep->ex_indexfile;
2483         if (grp->gr_type == GT_HOST)
2484                 ai = grp->gr_ptr.gt_addrinfo;
2485         else
2486                 ai = NULL;
2487         eap->ex_numsecflavors = ep->ex_numsecflavors;
2488         for (i = 0; i < eap->ex_numsecflavors; i++)
2489                 eap->ex_secflavors[i] = ep->ex_secflavors[i];
2490         if (eap->ex_numsecflavors == 0) {
2491                 eap->ex_numsecflavors = 1;
2492                 eap->ex_secflavors[0] = AUTH_SYS;
2493         }
2494         done = FALSE;
2495
2496         if (v4root_phase == 0) {
2497                 build_iovec(&iov, &iovlen, "fstype", NULL, 0);
2498                 build_iovec(&iov, &iovlen, "fspath", NULL, 0);
2499                 build_iovec(&iov, &iovlen, "from", NULL, 0);
2500                 build_iovec(&iov, &iovlen, "update", NULL, 0);
2501                 build_iovec(&iov, &iovlen, "export", eap,
2502                     sizeof (struct export_args));
2503                 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
2504         }
2505
2506         while (!done) {
2507                 switch (grp->gr_type) {
2508                 case GT_HOST:
2509                         if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0)
2510                                 goto skip;
2511                         eap->ex_addr = ai->ai_addr;
2512                         eap->ex_addrlen = ai->ai_addrlen;
2513                         eap->ex_masklen = 0;
2514                         break;
2515                 case GT_NET:
2516                         if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 &&
2517                             have_v6 == 0)
2518                                 goto skip;
2519                         eap->ex_addr =
2520                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net;
2521                         eap->ex_addrlen =
2522                             ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_net)->sa_len;
2523                         eap->ex_mask =
2524                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask;
2525                         eap->ex_masklen = ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask)->sa_len;
2526                         break;
2527                 case GT_DEFAULT:
2528                         eap->ex_addr = NULL;
2529                         eap->ex_addrlen = 0;
2530                         eap->ex_mask = NULL;
2531                         eap->ex_masklen = 0;
2532                         break;
2533                 case GT_IGNORE:
2534                         ret = 0;
2535                         goto error_exit;
2536                         break;
2537                 default:
2538                         syslog(LOG_ERR, "bad grouptype");
2539                         if (cp)
2540                                 *cp = savedc;
2541                         ret = 1;
2542                         goto error_exit;
2543                 };
2544
2545                 /*
2546                  * For V4:, use the nfssvc() syscall, instead of mount().
2547                  */
2548                 if (v4root_phase == 2) {
2549                         nfsea.fspec = v4root_dirpath;
2550                         if (nfssvc(NFSSVC_V4ROOTEXPORT, (caddr_t)&nfsea) < 0) {
2551                                 syslog(LOG_ERR, "Exporting V4: failed");
2552                                 return (2);
2553                         }
2554                 } else {
2555                         /*
2556                          * XXX:
2557                          * Maybe I should just use the fsb->f_mntonname path
2558                          * instead of looping back up the dirp to the mount
2559                          * point??
2560                          * Also, needs to know how to export all types of local
2561                          * exportable filesystems and not just "ufs".
2562                          */
2563                         iov[1].iov_base = fsb->f_fstypename; /* "fstype" */
2564                         iov[1].iov_len = strlen(fsb->f_fstypename) + 1;
2565                         iov[3].iov_base = fsb->f_mntonname; /* "fspath" */
2566                         iov[3].iov_len = strlen(fsb->f_mntonname) + 1;
2567                         iov[5].iov_base = fsb->f_mntfromname; /* "from" */
2568                         iov[5].iov_len = strlen(fsb->f_mntfromname) + 1;
2569                         errmsg[0] = '\0';
2570
2571                         while (nmount(iov, iovlen, fsb->f_flags) < 0) {
2572                                 if (cp)
2573                                         *cp-- = savedc;
2574                                 else
2575                                         cp = dirp + dirplen - 1;
2576                                 if (opt_flags & OP_QUIET) {
2577                                         ret = 1;
2578                                         goto error_exit;
2579                                 }
2580                                 if (errno == EPERM) {
2581                                         if (debug)
2582                                                 warnx("can't change attributes for %s: %s",
2583                                                     dirp, errmsg);
2584                                         syslog(LOG_ERR,
2585                                            "can't change attributes for %s: %s",
2586                                             dirp, errmsg);
2587                                         ret = 1;
2588                                         goto error_exit;
2589                                 }
2590                                 if (opt_flags & OP_ALLDIRS) {
2591                                         if (errno == EINVAL)
2592                                                 syslog(LOG_ERR,
2593                 "-alldirs requested but %s is not a filesystem mountpoint",
2594                                                     dirp);
2595                                         else
2596                                                 syslog(LOG_ERR,
2597                                                     "could not remount %s: %m",
2598                                                     dirp);
2599                                         ret = 1;
2600                                         goto error_exit;
2601                                 }
2602                                 /* back up over the last component */
2603                                 while (*cp == '/' && cp > dirp)
2604                                         cp--;
2605                                 while (*(cp - 1) != '/' && cp > dirp)
2606                                         cp--;
2607                                 if (cp == dirp) {
2608                                         if (debug)
2609                                                 warnx("mnt unsucc");
2610                                         syslog(LOG_ERR, "can't export %s %s",
2611                                             dirp, errmsg);
2612                                         ret = 1;
2613                                         goto error_exit;
2614                                 }
2615                                 savedc = *cp;
2616                                 *cp = '\0';
2617                                 /*
2618                                  * Check that we're still on the same
2619                                  * filesystem.
2620                                  */
2621                                 if (statfs(dirp, &fsb1) != 0 ||
2622                                     bcmp(&fsb1.f_fsid, &fsb->f_fsid,
2623                                     sizeof (fsb1.f_fsid)) != 0) {
2624                                         *cp = savedc;
2625                                         syslog(LOG_ERR,
2626                                             "can't export %s %s", dirp,
2627                                             errmsg);
2628                                         ret = 1;
2629                                         goto error_exit;
2630                                 }
2631                         }
2632                 }
2633
2634                 /*
2635                  * For the experimental server:
2636                  * If this is the public directory, get the file handle
2637                  * and load it into the kernel via the nfssvc() syscall.
2638                  */
2639                 if ((exflags & MNT_EXPUBLIC) != 0) {
2640                         fhandle_t fh;
2641                         char *public_name;
2642
2643                         if (eap->ex_indexfile != NULL)
2644                                 public_name = eap->ex_indexfile;
2645                         else
2646                                 public_name = dirp;
2647                         if (getfh(public_name, &fh) < 0)
2648                                 syslog(LOG_ERR,
2649                                     "Can't get public fh for %s", public_name);
2650                         else if (nfssvc(NFSSVC_PUBLICFH, (caddr_t)&fh) < 0)
2651                                 syslog(LOG_ERR,
2652                                     "Can't set public fh for %s", public_name);
2653                         else
2654                                 has_publicfh = 1;
2655                 }
2656 skip:
2657                 if (ai != NULL)
2658                         ai = ai->ai_next;
2659                 if (ai == NULL)
2660                         done = TRUE;
2661         }
2662         if (cp)
2663                 *cp = savedc;
2664 error_exit:
2665         /* free strings allocated by strdup() in getmntopts.c */
2666         if (iov != NULL) {
2667                 free(iov[0].iov_base); /* fstype */
2668                 free(iov[2].iov_base); /* fspath */
2669                 free(iov[4].iov_base); /* from */
2670                 free(iov[6].iov_base); /* update */
2671                 free(iov[8].iov_base); /* export */
2672                 free(iov[10].iov_base); /* errmsg */
2673
2674                 /* free iov, allocated by realloc() */
2675                 free(iov);
2676         }
2677         return (ret);
2678 }
2679
2680 /*
2681  * Translate a net address.
2682  *
2683  * If `maskflg' is nonzero, then `cp' is a netmask, not a network address.
2684  */
2685 static int
2686 get_net(char *cp, struct netmsk *net, int maskflg)
2687 {
2688         struct netent *np = NULL;
2689         char *name, *p, *prefp;
2690         struct sockaddr_in sin;
2691         struct sockaddr *sa = NULL;
2692         struct addrinfo hints, *ai = NULL;
2693         char netname[NI_MAXHOST];
2694         long preflen;
2695
2696         p = prefp = NULL;
2697         if ((opt_flags & OP_MASKLEN) && !maskflg) {
2698                 p = strchr(cp, '/');
2699                 *p = '\0';
2700                 prefp = p + 1;
2701         }
2702
2703         /*
2704          * Check for a numeric address first. We wish to avoid
2705          * possible DNS lookups in getnetbyname().
2706          */
2707         if (isxdigit(*cp) || *cp == ':') {
2708                 memset(&hints, 0, sizeof hints);
2709                 /* Ensure the mask and the network have the same family. */
2710                 if (maskflg && (opt_flags & OP_NET))
2711                         hints.ai_family = net->nt_net.ss_family;
2712                 else if (!maskflg && (opt_flags & OP_HAVEMASK))
2713                         hints.ai_family = net->nt_mask.ss_family;
2714                 else
2715                         hints.ai_family = AF_UNSPEC;
2716                 hints.ai_flags = AI_NUMERICHOST;
2717                 if (getaddrinfo(cp, NULL, &hints, &ai) == 0)
2718                         sa = ai->ai_addr;
2719                 if (sa != NULL && ai->ai_family == AF_INET) {
2720                         /*
2721                          * The address in `cp' is really a network address, so
2722                          * use inet_network() to re-interpret this correctly.
2723                          * e.g. "127.1" means 127.1.0.0, not 127.0.0.1.
2724                          */
2725                         bzero(&sin, sizeof sin);
2726                         sin.sin_family = AF_INET;
2727                         sin.sin_len = sizeof sin;
2728                         sin.sin_addr = inet_makeaddr(inet_network(cp), 0);
2729                         if (debug)
2730                                 fprintf(stderr, "get_net: v4 addr %s\n",
2731                                     inet_ntoa(sin.sin_addr));
2732                         sa = (struct sockaddr *)&sin;
2733                 }
2734         }
2735         if (sa == NULL && (np = getnetbyname(cp)) != NULL) {
2736                 bzero(&sin, sizeof sin);
2737                 sin.sin_family = AF_INET;
2738                 sin.sin_len = sizeof sin;
2739                 sin.sin_addr = inet_makeaddr(np->n_net, 0);
2740                 sa = (struct sockaddr *)&sin;
2741         }
2742         if (sa == NULL)
2743                 goto fail;
2744
2745         if (maskflg) {
2746                 /* The specified sockaddr is a mask. */
2747                 if (checkmask(sa) != 0)
2748                         goto fail;
2749                 bcopy(sa, &net->nt_mask, sa->sa_len);
2750                 opt_flags |= OP_HAVEMASK;
2751         } else {
2752                 /* The specified sockaddr is a network address. */
2753                 bcopy(sa, &net->nt_net, sa->sa_len);
2754
2755                 /* Get a network name for the export list. */
2756                 if (np) {
2757                         name = np->n_name;
2758                 } else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname,
2759                    NULL, 0, NI_NUMERICHOST) == 0) {
2760                         name = netname;
2761                 } else {
2762                         goto fail;
2763                 }
2764                 if ((net->nt_name = strdup(name)) == NULL)
2765                         out_of_mem();
2766
2767                 /*
2768                  * Extract a mask from either a "/<masklen>" suffix, or
2769                  * from the class of an IPv4 address.
2770                  */
2771                 if (opt_flags & OP_MASKLEN) {
2772                         preflen = strtol(prefp, NULL, 10);
2773                         if (preflen < 0L || preflen == LONG_MAX)
2774                                 goto fail;
2775                         bcopy(sa, &net->nt_mask, sa->sa_len);
2776                         if (makemask(&net->nt_mask, (int)preflen) != 0)
2777                                 goto fail;
2778                         opt_flags |= OP_HAVEMASK;
2779                         *p = '/';
2780                 } else if (sa->sa_family == AF_INET &&
2781                     (opt_flags & OP_MASK) == 0) {
2782                         in_addr_t addr;
2783
2784                         addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
2785                         if (IN_CLASSA(addr))
2786                                 preflen = 8;
2787                         else if (IN_CLASSB(addr))
2788                                 preflen = 16;
2789                         else if (IN_CLASSC(addr))
2790                                 preflen = 24;
2791                         else if (IN_CLASSD(addr))
2792                                 preflen = 28;
2793                         else
2794                                 preflen = 32;   /* XXX */
2795
2796                         bcopy(sa, &net->nt_mask, sa->sa_len);
2797                         makemask(&net->nt_mask, (int)preflen);
2798                         opt_flags |= OP_HAVEMASK;
2799                 }
2800         }
2801
2802         if (ai)
2803                 freeaddrinfo(ai);
2804         return 0;
2805
2806 fail:
2807         if (ai)
2808                 freeaddrinfo(ai);
2809         return 1;
2810 }
2811
2812 /*
2813  * Parse out the next white space separated field
2814  */
2815 static void
2816 nextfield(char **cp, char **endcp)
2817 {
2818         char *p;
2819
2820         p = *cp;
2821         while (*p == ' ' || *p == '\t')
2822                 p++;
2823         if (*p == '\n' || *p == '\0')
2824                 *cp = *endcp = p;
2825         else {
2826                 *cp = p++;
2827                 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
2828                         p++;
2829                 *endcp = p;
2830         }
2831 }
2832
2833 /*
2834  * Get an exports file line. Skip over blank lines and handle line
2835  * continuations.
2836  */
2837 static int
2838 get_line(void)
2839 {
2840         char *p, *cp;
2841         size_t len;
2842         int totlen, cont_line;
2843
2844         /*
2845          * Loop around ignoring blank lines and getting all continuation lines.
2846          */
2847         p = line;
2848         totlen = 0;
2849         do {
2850                 if ((p = fgetln(exp_file, &len)) == NULL)
2851                         return (0);
2852                 cp = p + len - 1;
2853                 cont_line = 0;
2854                 while (cp >= p &&
2855                     (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) {
2856                         if (*cp == '\\')
2857                                 cont_line = 1;
2858                         cp--;
2859                         len--;
2860                 }
2861                 if (cont_line) {
2862                         *++cp = ' ';
2863                         len++;
2864                 }
2865                 if (linesize < len + totlen + 1) {
2866                         linesize = len + totlen + 1;
2867                         line = realloc(line, linesize);
2868                         if (line == NULL)
2869                                 out_of_mem();
2870                 }
2871                 memcpy(line + totlen, p, len);
2872                 totlen += len;
2873                 line[totlen] = '\0';
2874         } while (totlen == 0 || cont_line);
2875         return (1);
2876 }
2877
2878 /*
2879  * Parse a description of a credential.
2880  */
2881 static void
2882 parsecred(char *namelist, struct xucred *cr)
2883 {
2884         char *name;
2885         int cnt;
2886         char *names;
2887         struct passwd *pw;
2888         struct group *gr;
2889         gid_t groups[XU_NGROUPS + 1];
2890         int ngroups;
2891
2892         cr->cr_version = XUCRED_VERSION;
2893         /*
2894          * Set up the unprivileged user.
2895          */
2896         cr->cr_uid = -2;
2897         cr->cr_groups[0] = -2;
2898         cr->cr_ngroups = 1;
2899         /*
2900          * Get the user's password table entry.
2901          */
2902         names = strsep_quote(&namelist, " \t\n");
2903         name = strsep(&names, ":");
2904         /* Bug?  name could be NULL here */
2905         if (isdigit(*name) || *name == '-')
2906                 pw = getpwuid(atoi(name));
2907         else
2908                 pw = getpwnam(name);
2909         /*
2910          * Credentials specified as those of a user.
2911          */
2912         if (names == NULL) {
2913                 if (pw == NULL) {
2914                         syslog(LOG_ERR, "unknown user: %s", name);
2915                         return;
2916                 }
2917                 cr->cr_uid = pw->pw_uid;
2918                 ngroups = XU_NGROUPS + 1;
2919                 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups))
2920                         syslog(LOG_ERR, "too many groups");
2921                 /*
2922                  * Compress out duplicate.
2923                  */
2924                 cr->cr_ngroups = ngroups - 1;
2925                 cr->cr_groups[0] = groups[0];
2926                 for (cnt = 2; cnt < ngroups; cnt++)
2927                         cr->cr_groups[cnt - 1] = groups[cnt];
2928                 return;
2929         }
2930         /*
2931          * Explicit credential specified as a colon separated list:
2932          *      uid:gid:gid:...
2933          */
2934         if (pw != NULL)
2935                 cr->cr_uid = pw->pw_uid;
2936         else if (isdigit(*name) || *name == '-')
2937                 cr->cr_uid = atoi(name);
2938         else {
2939                 syslog(LOG_ERR, "unknown user: %s", name);
2940                 return;
2941         }
2942         cr->cr_ngroups = 0;
2943         while (names != NULL && *names != '\0' && cr->cr_ngroups < XU_NGROUPS) {
2944                 name = strsep(&names, ":");
2945                 if (isdigit(*name) || *name == '-') {
2946                         cr->cr_groups[cr->cr_ngroups++] = atoi(name);
2947                 } else {
2948                         if ((gr = getgrnam(name)) == NULL) {
2949                                 syslog(LOG_ERR, "unknown group: %s", name);
2950                                 continue;
2951                         }
2952                         cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid;
2953                 }
2954         }
2955         if (names != NULL && *names != '\0' && cr->cr_ngroups == XU_NGROUPS)
2956                 syslog(LOG_ERR, "too many groups");
2957 }
2958
2959 #define STRSIZ  (MNTNAMLEN+MNTPATHLEN+50)
2960 /*
2961  * Routines that maintain the remote mounttab
2962  */
2963 static void
2964 get_mountlist(void)
2965 {
2966         struct mountlist *mlp, **mlpp;
2967         char *host, *dirp, *cp;
2968         char str[STRSIZ];
2969         FILE *mlfile;
2970
2971         if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) {
2972                 if (errno == ENOENT)
2973                         return;
2974                 else {
2975                         syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST);
2976                         return;
2977                 }
2978         }
2979         mlpp = &mlhead;
2980         while (fgets(str, STRSIZ, mlfile) != NULL) {
2981                 cp = str;
2982                 host = strsep(&cp, " \t\n");
2983                 dirp = strsep(&cp, " \t\n");
2984                 if (host == NULL || dirp == NULL)
2985                         continue;
2986                 mlp = (struct mountlist *)malloc(sizeof (*mlp));
2987                 if (mlp == (struct mountlist *)NULL)
2988                         out_of_mem();
2989                 strncpy(mlp->ml_host, host, MNTNAMLEN);
2990                 mlp->ml_host[MNTNAMLEN] = '\0';
2991                 strncpy(mlp->ml_dirp, dirp, MNTPATHLEN);
2992                 mlp->ml_dirp[MNTPATHLEN] = '\0';
2993                 mlp->ml_next = (struct mountlist *)NULL;
2994                 *mlpp = mlp;
2995                 mlpp = &mlp->ml_next;
2996         }
2997         fclose(mlfile);
2998 }
2999
3000 static void
3001 del_mlist(char *hostp, char *dirp)
3002 {
3003         struct mountlist *mlp, **mlpp;
3004         struct mountlist *mlp2;
3005         FILE *mlfile;
3006         int fnd = 0;
3007
3008         mlpp = &mlhead;
3009         mlp = mlhead;
3010         while (mlp) {
3011                 if (!strcmp(mlp->ml_host, hostp) &&
3012                     (!dirp || !strcmp(mlp->ml_dirp, dirp))) {
3013                         fnd = 1;
3014                         mlp2 = mlp;
3015                         *mlpp = mlp = mlp->ml_next;
3016                         free((caddr_t)mlp2);
3017                 } else {
3018                         mlpp = &mlp->ml_next;
3019                         mlp = mlp->ml_next;
3020                 }
3021         }
3022         if (fnd) {
3023                 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) {
3024                         syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST);
3025                         return;
3026                 }
3027                 mlp = mlhead;
3028                 while (mlp) {
3029                         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
3030                         mlp = mlp->ml_next;
3031                 }
3032                 fclose(mlfile);
3033         }
3034 }
3035
3036 static void
3037 add_mlist(char *hostp, char *dirp)
3038 {
3039         struct mountlist *mlp, **mlpp;
3040         FILE *mlfile;
3041
3042         mlpp = &mlhead;
3043         mlp = mlhead;
3044         while (mlp) {
3045                 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp))
3046                         return;
3047                 mlpp = &mlp->ml_next;
3048                 mlp = mlp->ml_next;
3049         }
3050         mlp = (struct mountlist *)malloc(sizeof (*mlp));
3051         if (mlp == (struct mountlist *)NULL)
3052                 out_of_mem();
3053         strncpy(mlp->ml_host, hostp, MNTNAMLEN);
3054         mlp->ml_host[MNTNAMLEN] = '\0';
3055         strncpy(mlp->ml_dirp, dirp, MNTPATHLEN);
3056         mlp->ml_dirp[MNTPATHLEN] = '\0';
3057         mlp->ml_next = (struct mountlist *)NULL;
3058         *mlpp = mlp;
3059         if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
3060                 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST);
3061                 return;
3062         }
3063         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
3064         fclose(mlfile);
3065 }
3066
3067 /*
3068  * Free up a group list.
3069  */
3070 static void
3071 free_grp(struct grouplist *grp)
3072 {
3073         if (grp->gr_type == GT_HOST) {
3074                 if (grp->gr_ptr.gt_addrinfo != NULL)
3075                         freeaddrinfo(grp->gr_ptr.gt_addrinfo);
3076         } else if (grp->gr_type == GT_NET) {
3077                 if (grp->gr_ptr.gt_net.nt_name)
3078                         free(grp->gr_ptr.gt_net.nt_name);
3079         }
3080         free((caddr_t)grp);
3081 }
3082
3083 #ifdef DEBUG
3084 static void
3085 SYSLOG(int pri, const char *fmt, ...)
3086 {
3087         va_list ap;
3088
3089         va_start(ap, fmt);
3090         vfprintf(stderr, fmt, ap);
3091         va_end(ap);
3092 }
3093 #endif /* DEBUG */
3094
3095 /*
3096  * Check options for consistency.
3097  */
3098 static int
3099 check_options(struct dirlist *dp)
3100 {
3101
3102         if (v4root_phase == 0 && dp == NULL)
3103             return (1);
3104         if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL)) {
3105             syslog(LOG_ERR, "-mapall and -maproot mutually exclusive");
3106             return (1);
3107         }
3108         if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) {
3109                 syslog(LOG_ERR, "-mask requires -network");
3110                 return (1);
3111         }
3112         if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) {
3113                 syslog(LOG_ERR, "-network requires mask specification");
3114                 return (1);
3115         }
3116         if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) {
3117                 syslog(LOG_ERR, "-mask and /masklen are mutually exclusive");
3118                 return (1);
3119         }
3120         if (v4root_phase > 0 &&
3121             (opt_flags &
3122              ~(OP_SEC | OP_MASK | OP_NET | OP_HAVEMASK | OP_MASKLEN)) != 0) {
3123             syslog(LOG_ERR,"only -sec,-net,-mask options allowed on V4:");
3124             return (1);
3125         }
3126         if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
3127             syslog(LOG_ERR, "-alldirs has multiple directories");
3128             return (1);
3129         }
3130         return (0);
3131 }
3132
3133 /*
3134  * Check an absolute directory path for any symbolic links. Return true
3135  */
3136 static int
3137 check_dirpath(char *dirp)
3138 {
3139         char *cp;
3140         int ret = 1;
3141         struct stat sb;
3142
3143         cp = dirp + 1;
3144         while (*cp && ret) {
3145                 if (*cp == '/') {
3146                         *cp = '\0';
3147                         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
3148                                 ret = 0;
3149                         *cp = '/';
3150                 }
3151                 cp++;
3152         }
3153         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
3154                 ret = 0;
3155         return (ret);
3156 }
3157
3158 /*
3159  * Make a netmask according to the specified prefix length. The ss_family
3160  * and other non-address fields must be initialised before calling this.
3161  */
3162 static int
3163 makemask(struct sockaddr_storage *ssp, int bitlen)
3164 {
3165         u_char *p;
3166         int bits, i, len;
3167
3168         if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL)
3169                 return (-1);
3170         if (bitlen > len * CHAR_BIT)
3171                 return (-1);
3172
3173         for (i = 0; i < len; i++) {
3174                 bits = (bitlen > CHAR_BIT) ? CHAR_BIT : bitlen;
3175                 *p++ = (u_char)~0 << (CHAR_BIT - bits);
3176                 bitlen -= bits;
3177         }
3178         return 0;
3179 }
3180
3181 /*
3182  * Check that the sockaddr is a valid netmask. Returns 0 if the mask
3183  * is acceptable (i.e. of the form 1...10....0).
3184  */
3185 static int
3186 checkmask(struct sockaddr *sa)
3187 {
3188         u_char *mask;
3189         int i, len;
3190
3191         if ((mask = sa_rawaddr(sa, &len)) == NULL)
3192                 return (-1);
3193
3194         for (i = 0; i < len; i++)
3195                 if (mask[i] != 0xff)
3196                         break;
3197         if (i < len) {
3198                 if (~mask[i] & (u_char)(~mask[i] + 1))
3199                         return (-1);
3200                 i++;
3201         }
3202         for (; i < len; i++)
3203                 if (mask[i] != 0)
3204                         return (-1);
3205         return (0);
3206 }
3207
3208 /*
3209  * Compare two sockaddrs according to a specified mask. Return zero if
3210  * `sa1' matches `sa2' when filtered by the netmask in `samask'.
3211  * If samask is NULL, perform a full comparison.
3212  */
3213 static int
3214 sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask)
3215 {
3216         unsigned char *p1, *p2, *mask;
3217         int len, i;
3218
3219         if (sa1->sa_family != sa2->sa_family ||
3220             (p1 = sa_rawaddr(sa1, &len)) == NULL ||
3221             (p2 = sa_rawaddr(sa2, NULL)) == NULL)
3222                 return (1);
3223
3224         switch (sa1->sa_family) {
3225         case AF_INET6:
3226                 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
3227                     ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
3228                         return (1);
3229                 break;
3230         }
3231
3232         /* Simple binary comparison if no mask specified. */
3233         if (samask == NULL)
3234                 return (memcmp(p1, p2, len));
3235
3236         /* Set up the mask, and do a mask-based comparison. */
3237         if (sa1->sa_family != samask->sa_family ||
3238             (mask = sa_rawaddr(samask, NULL)) == NULL)
3239                 return (1);
3240
3241         for (i = 0; i < len; i++)
3242                 if ((p1[i] & mask[i]) != (p2[i] & mask[i]))
3243                         return (1);
3244         return (0);
3245 }
3246
3247 /*
3248  * Return a pointer to the part of the sockaddr that contains the
3249  * raw address, and set *nbytes to its length in bytes. Returns
3250  * NULL if the address family is unknown.
3251  */
3252 static void *
3253 sa_rawaddr(struct sockaddr *sa, int *nbytes) {
3254         void *p;
3255         int len;
3256
3257         switch (sa->sa_family) {
3258         case AF_INET:
3259                 len = sizeof(((struct sockaddr_in *)sa)->sin_addr);
3260                 p = &((struct sockaddr_in *)sa)->sin_addr;
3261                 break;
3262         case AF_INET6:
3263                 len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr);
3264                 p = &((struct sockaddr_in6 *)sa)->sin6_addr;
3265                 break;
3266         default:
3267                 p = NULL;
3268                 len = 0;
3269         }
3270
3271         if (nbytes != NULL)
3272                 *nbytes = len;
3273         return (p);
3274 }
3275
3276 static void
3277 huphandler(int sig __unused)
3278 {
3279
3280         got_sighup = 1;
3281 }
3282
3283 static void
3284 terminate(int sig __unused)
3285 {
3286         pidfile_remove(pfh);
3287         rpcb_unset(MOUNTPROG, MOUNTVERS, NULL);
3288         rpcb_unset(MOUNTPROG, MOUNTVERS3, NULL);
3289         exit (0);
3290 }