usr.sbin/mountd/mountd.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1989, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Herb Hasler and Rick Macklem at The University of Guelph.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #ifndef lint
  36 static const char copyright[] =
  37 "@(#) Copyright (c) 1989, 1993\n\
  38         The Regents of the University of California.  All rights reserved.\n";
  39 #endif /*not lint*/
  40
  41 #if 0
  42 #ifndef lint
  43 static char sccsid[] = "@(#)mountd.c    8.15 (Berkeley) 5/1/95";
  44 #endif /*not lint*/
  45 #endif
  46
  47 #include <sys/cdefs.h>
  48 __FBSDID("$FreeBSD$");
  49
  50 #include <sys/param.h>
  51 #include <sys/fcntl.h>
  52 #include <sys/fnv_hash.h>
  53 #include <sys/linker.h>
  54 #include <sys/module.h>
  55 #include <sys/mount.h>
  56 #include <sys/queue.h>
  57 #include <sys/stat.h>
  58 #include <sys/sysctl.h>
  59 #include <sys/syslog.h>
  60
  61 #include <rpc/rpc.h>
  62 #include <rpc/rpc_com.h>
  63 #include <rpc/pmap_clnt.h>
  64 #include <rpc/pmap_prot.h>
  65 #include <rpcsvc/mount.h>
  66 #include <nfs/nfsproto.h>
  67 #include <nfs/nfssvc.h>
  68 #include <nfsserver/nfs.h>
  69
  70 #include <fs/nfs/nfsport.h>
  71
  72 #include <arpa/inet.h>
  73
  74 #include <ctype.h>
  75 #include <err.h>
  76 #include <errno.h>
  77 #include <grp.h>
  78 #include <libutil.h>
  79 #include <limits.h>
  80 #include <netdb.h>
  81 #include <pwd.h>
  82 #include <signal.h>
  83 #include <stdio.h>
  84 #include <stdlib.h>
  85 #include <string.h>
  86 #include <unistd.h>
  87 #include "pathnames.h"
  88 #include "mntopts.h"
  89
  90 #ifdef DEBUG
  91 #include <stdarg.h>
  92 #endif
  93
  94 /*
  95  * Structures for keeping the mount list and export list
  96  */
  97 struct mountlist {
  98         char    ml_host[MNTNAMLEN+1];
  99         char    ml_dirp[MNTPATHLEN+1];
 100
 101         SLIST_ENTRY(mountlist)  next;
 102 };
 103
 104 struct dirlist {
 105         struct dirlist  *dp_left;
 106         struct dirlist  *dp_right;
 107         int             dp_flag;
 108         struct hostlist *dp_hosts;      /* List of hosts this dir exported to */
 109         char            *dp_dirp;
 110 };
 111 /* dp_flag bits */
 112 #define DP_DEFSET       0x1
 113 #define DP_HOSTSET      0x2
 114
 115 struct exportlist {
 116         struct dirlist  *ex_dirl;
 117         struct dirlist  *ex_defdir;
 118         struct grouplist *ex_grphead;
 119         int             ex_flag;
 120         fsid_t          ex_fs;
 121         char            *ex_fsdir;
 122         char            *ex_indexfile;
 123         struct xucred   ex_defanon;
 124         int             ex_defexflags;
 125         int             ex_numsecflavors;
 126         int             ex_secflavors[MAXSECFLAVORS];
 127         int             ex_defnumsecflavors;
 128         int             ex_defsecflavors[MAXSECFLAVORS];
 129
 130         SLIST_ENTRY(exportlist) entries;
 131 };
 132 /* ex_flag bits */
 133 #define EX_LINKED       0x1
 134 #define EX_DONE         0x2
 135 #define EX_DEFSET       0x4
 136 #define EX_PUBLICFH     0x8
 137
 138 SLIST_HEAD(exportlisthead, exportlist);
 139
 140 struct netmsk {
 141         struct sockaddr_storage nt_net;
 142         struct sockaddr_storage nt_mask;
 143         char            *nt_name;
 144 };
 145
 146 union grouptypes {
 147         struct addrinfo *gt_addrinfo;
 148         struct netmsk   gt_net;
 149 };
 150
 151 struct grouplist {
 152         int gr_type;
 153         union grouptypes gr_ptr;
 154         struct grouplist *gr_next;
 155         struct xucred gr_anon;
 156         int gr_exflags;
 157         int gr_flag;
 158         int gr_numsecflavors;
 159         int gr_secflavors[MAXSECFLAVORS];
 160 };
 161 /* Group types */
 162 #define GT_NULL         0x0
 163 #define GT_HOST         0x1
 164 #define GT_NET          0x2
 165 #define GT_DEFAULT      0x3
 166 #define GT_IGNORE       0x5
 167
 168 /* Group flags */
 169 #define GR_FND          0x1
 170
 171 struct hostlist {
 172         int              ht_flag;       /* Uses DP_xx bits */
 173         struct grouplist *ht_grp;
 174         struct hostlist  *ht_next;
 175 };
 176
 177 struct fhreturn {
 178         int     fhr_flag;
 179         int     fhr_vers;
 180         nfsfh_t fhr_fh;
 181         int     fhr_numsecflavors;
 182         int     *fhr_secflavors;
 183 };
 184
 185 #define GETPORT_MAXTRY  20      /* Max tries to get a port # */
 186
 187 /* Global defs */
 188 static char     *add_expdir(struct dirlist **, char *, int);
 189 static void     add_dlist(struct dirlist **, struct dirlist *,
 190                     struct grouplist *, int, struct exportlist *,
 191                     struct xucred *, int);
 192 static void     add_mlist(char *, char *);
 193 static int      check_dirpath(char *);
 194 static int      check_options(struct dirlist *);
 195 static int      checkmask(struct sockaddr *sa);
 196 static int      chk_host(struct dirlist *, struct sockaddr *, int *, int *,
 197                     int *, int **);
 198 static char     *strsep_quote(char **stringp, const char *delim);
 199 static int      create_service(struct netconfig *nconf);
 200 static void     complete_service(struct netconfig *nconf, char *port_str);
 201 static void     clearout_service(void);
 202 static void     del_mlist(char *hostp, char *dirp);
 203 static struct dirlist   *dirp_search(struct dirlist *, char *);
 204 static int      do_export_mount(struct exportlist *, struct statfs *);
 205 static int      do_mount(struct exportlist *, struct grouplist *, int,
 206                     struct xucred *, char *, int, struct statfs *, int, int *);
 207 static int      do_opt(char **, char **, struct exportlist *,
 208                     struct grouplist *, int *, int *, struct xucred *);
 209 static struct exportlist        *ex_search(fsid_t *, struct exportlisthead *);
 210 static struct exportlist        *get_exp(void);
 211 static void     free_dir(struct dirlist *);
 212 static void     free_exp(struct exportlist *);
 213 static void     free_grp(struct grouplist *);
 214 static void     free_host(struct hostlist *);
 215 static void     free_v4rootexp(void);
 216 static void     get_exportlist_one(int);
 217 static void     get_exportlist(int);
 218 static void     insert_exports(struct exportlist *, struct exportlisthead *);
 219 static void     free_exports(struct exportlisthead *);
 220 static void     read_exportfile(int);
 221 static int      compare_nmount_exportlist(struct iovec *, int, char *);
 222 static int      compare_export(struct exportlist *, struct exportlist *);
 223 static int      compare_cred(struct xucred *, struct xucred *);
 224 static int      compare_secflavor(int *, int *, int);
 225 static void     delete_export(struct iovec *, int, struct statfs *, char *);
 226 static int      get_host(char *, struct grouplist *, struct grouplist *);
 227 static struct hostlist *get_ht(void);
 228 static int      get_line(void);
 229 static void     get_mountlist(void);
 230 static int      get_net(char *, struct netmsk *, int);
 231 static void     getexp_err(struct exportlist *, struct grouplist *, const char *);
 232 static struct grouplist *get_grp(void);
 233 static void     hang_dirp(struct dirlist *, struct grouplist *,
 234                     struct exportlist *, int, struct xucred *, int);
 235 static void     huphandler(int sig);
 236 static int      makemask(struct sockaddr_storage *ssp, int bitlen);
 237 static void     mntsrv(struct svc_req *, SVCXPRT *);
 238 static void     nextfield(char **, char **);
 239 static void     out_of_mem(void);
 240 static void     parsecred(char *, struct xucred *);
 241 static int      parsesec(char *, struct exportlist *);
 242 static int      put_exlist(struct dirlist *, XDR *, struct dirlist *,
 243                     int *, int);
 244 static void     *sa_rawaddr(struct sockaddr *sa, int *nbytes);
 245 static int      sacmp(struct sockaddr *sa1, struct sockaddr *sa2,
 246                     struct sockaddr *samask);
 247 static int      scan_tree(struct dirlist *, struct sockaddr *);
 248 static void     usage(void);
 249 static int      xdr_dir(XDR *, char *);
 250 static int      xdr_explist(XDR *, caddr_t);
 251 static int      xdr_explist_brief(XDR *, caddr_t);
 252 static int      xdr_explist_common(XDR *, caddr_t, int);
 253 static int      xdr_fhs(XDR *, caddr_t);
 254 static int      xdr_mlist(XDR *, caddr_t);
 255 static void     terminate(int);
 256
 257 #define EXPHASH(f)      (fnv_32_buf((f), sizeof(fsid_t), 0) % exphashsize)
 258 static struct exportlisthead *exphead = NULL;
 259 static struct exportlisthead *oldexphead = NULL;
 260 static int exphashsize = 0;
 261 static SLIST_HEAD(, mountlist) mlhead = SLIST_HEAD_INITIALIZER(&mlhead);
 262 static char *exnames_default[2] = { _PATH_EXPORTS, NULL };
 263 static char **exnames;
 264 static char **hosts = NULL;
 265 static struct xucred def_anon = {
 266         XUCRED_VERSION,
 267         (uid_t)65534,
 268         1,
 269         { (gid_t)65533 },
 270         { NULL }
 271 };
 272 static int force_v2 = 0;
 273 static int resvport_only = 1;
 274 static int nhosts = 0;
 275 static int dir_only = 1;
 276 static int dolog = 0;
 277 static int got_sighup = 0;
 278 static int xcreated = 0;
 279
 280 static char *svcport_str = NULL;
 281 static int mallocd_svcport = 0;
 282 static int *sock_fd;
 283 static int sock_fdcnt;
 284 static int sock_fdpos;
 285 static int suspend_nfsd = 0;
 286
 287 static int opt_flags;
 288 static int have_v6 = 1;
 289
 290 static int v4root_phase = 0;
 291 static char v4root_dirpath[PATH_MAX + 1];
 292 static struct exportlist *v4root_ep = NULL;
 293 static int has_publicfh = 0;
 294 static int has_set_publicfh = 0;
 295
 296 static struct pidfh *pfh = NULL;
 297 /* Bits for opt_flags above */
 298 #define OP_MAPROOT      0x01
 299 #define OP_MAPALL       0x02
 300 /* 0x4 free */
 301 #define OP_MASK         0x08
 302 #define OP_NET          0x10
 303 #define OP_ALLDIRS      0x40
 304 #define OP_HAVEMASK     0x80    /* A mask was specified or inferred. */
 305 #define OP_QUIET        0x100
 306 #define OP_MASKLEN      0x200
 307 #define OP_SEC          0x400
 308
 309 #ifdef DEBUG
 310 static int debug = 1;
 311 static void     SYSLOG(int, const char *, ...) __printflike(2, 3);
 312 #define syslog SYSLOG
 313 #else
 314 static int debug = 0;
 315 #endif
 316
 317 /*
 318  * The LOGDEBUG() syslog() calls are always compiled into the daemon.
 319  * To enable them, create a file at _PATH_MOUNTDDEBUG. This file can be empty.
 320  * To disable the logging, just delete the file at _PATH_MOUNTDDEBUG.
 321  */
 322 static int logdebug = 0;
 323 #define LOGDEBUG(format, ...)                                           \
 324     (logdebug ? syslog(LOG_DEBUG, format, ## __VA_ARGS__) : 0)
 325
 326 /*
 327  * Similar to strsep(), but it allows for quoted strings
 328  * and escaped characters.
 329  *
 330  * It returns the string (or NULL, if *stringp is NULL),
 331  * which is a de-quoted version of the string if necessary.
 332  *
 333  * It modifies *stringp in place.
 334  */
 335 static char *
 336 strsep_quote(char **stringp, const char *delim)
 337 {
 338         char *srcptr, *dstptr, *retval;
 339         char quot = 0;
 340
 341         if (stringp == NULL || *stringp == NULL)
 342                 return (NULL);
 343
 344         srcptr = dstptr = retval = *stringp;
 345
 346         while (*srcptr) {
 347                 /*
 348                  * We're looking for several edge cases here.
 349                  * First:  if we're in quote state (quot != 0),
 350                  * then we ignore the delim characters, but otherwise
 351                  * process as normal, unless it is the quote character.
 352                  * Second:  if the current character is a backslash,
 353                  * we take the next character as-is, without checking
 354                  * for delim, quote, or backslash.  Exception:  if the
 355                  * next character is a NUL, that's the end of the string.
 356                  * Third:  if the character is a quote character, we toggle
 357                  * quote state.
 358                  * Otherwise:  check the current character for NUL, or
 359                  * being in delim, and end the string if either is true.
 360                  */
 361                 if (*srcptr == '\\') {
 362                         srcptr++;
 363                         /*
 364                          * The edge case here is if the next character
 365                          * is NUL, we want to stop processing.  But if
 366                          * it's not NUL, then we simply want to copy it.
 367                          */
 368                         if (*srcptr) {
 369                                 *dstptr++ = *srcptr++;
 370                         }
 371                         continue;
 372                 }
 373                 if (quot == 0 && (*srcptr == '\'' || *srcptr == '"')) {
 374                         quot = *srcptr++;
 375                         continue;
 376                 }
 377                 if (quot && *srcptr == quot) {
 378                         /* End of the quoted part */
 379                         quot = 0;
 380                         srcptr++;
 381                         continue;
 382                 }
 383                 if (!quot && strchr(delim, *srcptr))
 384                         break;
 385                 *dstptr++ = *srcptr++;
 386         }
 387
 388         *stringp = (*srcptr == '\0') ? NULL : srcptr + 1;
 389         *dstptr = 0; /* Terminate the string */
 390         return (retval);
 391 }
 392
 393 /*
 394  * Mountd server for NFS mount protocol as described in:
 395  * NFS: Network File System Protocol Specification, RFC1094, Appendix A
 396  * The optional arguments are the exports file name
 397  * default: _PATH_EXPORTS
 398  * and "-n" to allow nonroot mount.
 399  */
 400 int
 401 main(int argc, char **argv)
 402 {
 403         fd_set readfds;
 404         struct netconfig *nconf;
 405         char *endptr, **hosts_bak;
 406         void *nc_handle;
 407         pid_t otherpid;
 408         in_port_t svcport;
 409         int c, k, s;
 410         int maxrec = RPC_MAXDATASIZE;
 411         int attempt_cnt, port_len, port_pos, ret;
 412         char **port_list;
 413
 414         /* Check that another mountd isn't already running. */
 415         pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &otherpid);
 416         if (pfh == NULL) {
 417                 if (errno == EEXIST)
 418                         errx(1, "mountd already running, pid: %d.", otherpid);
 419                 warn("cannot open or create pidfile");
 420         }
 421
 422         s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
 423         if (s < 0)
 424                 have_v6 = 0;
 425         else
 426                 close(s);
 427
 428         while ((c = getopt(argc, argv, "2deh:lnp:rS")) != -1)
 429                 switch (c) {
 430                 case '2':
 431                         force_v2 = 1;
 432                         break;
 433                 case 'e':
 434                         /* now a no-op, since this is the default */
 435                         break;
 436                 case 'n':
 437                         resvport_only = 0;
 438                         break;
 439                 case 'r':
 440                         dir_only = 0;
 441                         break;
 442                 case 'd':
 443                         debug = debug ? 0 : 1;
 444                         break;
 445                 case 'l':
 446                         dolog = 1;
 447                         break;
 448                 case 'p':
 449                         endptr = NULL;
 450                         svcport = (in_port_t)strtoul(optarg, &endptr, 10);
 451                         if (endptr == NULL || *endptr != '\0' ||
 452                             svcport == 0 || svcport >= IPPORT_MAX)
 453                                 usage();
 454                         svcport_str = strdup(optarg);
 455                         break;
 456                 case 'h':
 457                         ++nhosts;
 458                         hosts_bak = hosts;
 459                         hosts_bak = realloc(hosts, nhosts * sizeof(char *));
 460                         if (hosts_bak == NULL) {
 461                                 if (hosts != NULL) {
 462                                         for (k = 0; k < nhosts; k++)
 463                                                 free(hosts[k]);
 464                                         free(hosts);
 465                                         out_of_mem();
 466                                 }
 467                         }
 468                         hosts = hosts_bak;
 469                         hosts[nhosts - 1] = strdup(optarg);
 470                         if (hosts[nhosts - 1] == NULL) {
 471                                 for (k = 0; k < (nhosts - 1); k++)
 472                                         free(hosts[k]);
 473                                 free(hosts);
 474                                 out_of_mem();
 475                         }
 476                         break;
 477                 case 'S':
 478                         suspend_nfsd = 1;
 479                         break;
 480                 default:
 481                         usage();
 482                 }
 483
 484         if (modfind("nfsd") < 0) {
 485                 /* Not present in kernel, try loading it */
 486                 if (kldload("nfsd") < 0 || modfind("nfsd") < 0)
 487                         errx(1, "NFS server is not available");
 488         }
 489
 490         argc -= optind;
 491         argv += optind;
 492         if (argc > 0)
 493                 exnames = argv;
 494         else
 495                 exnames = exnames_default;
 496         openlog("mountd", LOG_PID, LOG_DAEMON);
 497         if (debug)
 498                 warnx("getting export list");
 499         get_exportlist(0);
 500         if (debug)
 501                 warnx("getting mount list");
 502         get_mountlist();
 503         if (debug)
 504                 warnx("here we go");
 505         if (debug == 0) {
 506                 daemon(0, 0);
 507                 signal(SIGINT, SIG_IGN);
 508                 signal(SIGQUIT, SIG_IGN);
 509         }
 510         signal(SIGHUP, huphandler);
 511         signal(SIGTERM, terminate);
 512         signal(SIGPIPE, SIG_IGN);
 513
 514         pidfile_write(pfh);
 515
 516         rpcb_unset(MOUNTPROG, MOUNTVERS, NULL);
 517         rpcb_unset(MOUNTPROG, MOUNTVERS3, NULL);
 518         rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);
 519
 520         if (!resvport_only) {
 521                 if (sysctlbyname("vfs.nfsd.nfs_privport", NULL, NULL,
 522                     &resvport_only, sizeof(resvport_only)) != 0 &&
 523                     errno != ENOENT) {
 524                         syslog(LOG_ERR, "sysctl: %m");
 525                         exit(1);
 526                 }
 527         }
 528
 529         /*
 530          * If no hosts were specified, add a wildcard entry to bind to
 531          * INADDR_ANY. Otherwise make sure 127.0.0.1 and ::1 are added to the
 532          * list.
 533          */
 534         if (nhosts == 0) {
 535                 hosts = malloc(sizeof(char *));
 536                 if (hosts == NULL)
 537                         out_of_mem();
 538                 hosts[0] = "*";
 539                 nhosts = 1;
 540         } else {
 541                 hosts_bak = hosts;
 542                 if (have_v6) {
 543                         hosts_bak = realloc(hosts, (nhosts + 2) *
 544                             sizeof(char *));
 545                         if (hosts_bak == NULL) {
 546                                 for (k = 0; k < nhosts; k++)
 547                                         free(hosts[k]);
 548                                 free(hosts);
 549                                 out_of_mem();
 550                         } else
 551                                 hosts = hosts_bak;
 552                         nhosts += 2;
 553                         hosts[nhosts - 2] = "::1";
 554                 } else {
 555                         hosts_bak = realloc(hosts, (nhosts + 1) * sizeof(char *));
 556                         if (hosts_bak == NULL) {
 557                                 for (k = 0; k < nhosts; k++)
 558                                         free(hosts[k]);
 559                                 free(hosts);
 560                                 out_of_mem();
 561                         } else {
 562                                 nhosts += 1;
 563                                 hosts = hosts_bak;
 564                         }
 565                 }
 566
 567                 hosts[nhosts - 1] = "127.0.0.1";
 568         }
 569
 570         attempt_cnt = 1;
 571         sock_fdcnt = 0;
 572         sock_fd = NULL;
 573         port_list = NULL;
 574         port_len = 0;
 575         nc_handle = setnetconfig();
 576         while ((nconf = getnetconfig(nc_handle))) {
 577                 if (nconf->nc_flag & NC_VISIBLE) {
 578                         if (have_v6 == 0 && strcmp(nconf->nc_protofmly,
 579                             "inet6") == 0) {
 580                                 /* DO NOTHING */
 581                         } else {
 582                                 ret = create_service(nconf);
 583                                 if (ret == 1)
 584                                         /* Ignore this call */
 585                                         continue;
 586                                 if (ret < 0) {
 587                                         /*
 588                                          * Failed to bind port, so close off
 589                                          * all sockets created and try again
 590                                          * if the port# was dynamically
 591                                          * assigned via bind(2).
 592                                          */
 593                                         clearout_service();
 594                                         if (mallocd_svcport != 0 &&
 595                                             attempt_cnt < GETPORT_MAXTRY) {
 596                                                 free(svcport_str);
 597                                                 svcport_str = NULL;
 598                                                 mallocd_svcport = 0;
 599                                         } else {
 600                                                 errno = EADDRINUSE;
 601                                                 syslog(LOG_ERR,
 602                                                     "bindresvport_sa: %m");
 603                                                 exit(1);
 604                                         }
 605
 606                                         /* Start over at the first service. */
 607                                         free(sock_fd);
 608                                         sock_fdcnt = 0;
 609                                         sock_fd = NULL;
 610                                         nc_handle = setnetconfig();
 611                                         attempt_cnt++;
 612                                 } else if (mallocd_svcport != 0 &&
 613                                     attempt_cnt == GETPORT_MAXTRY) {
 614                                         /*
 615                                          * For the last attempt, allow
 616                                          * different port #s for each nconf
 617                                          * by saving the svcport_str and
 618                                          * setting it back to NULL.
 619                                          */
 620                                         port_list = realloc(port_list,
 621                                             (port_len + 1) * sizeof(char *));
 622                                         if (port_list == NULL)
 623                                                 out_of_mem();
 624                                         port_list[port_len++] = svcport_str;
 625                                         svcport_str = NULL;
 626                                         mallocd_svcport = 0;
 627                                 }
 628                         }
 629                 }
 630         }
 631
 632         /*
 633          * Successfully bound the ports, so call complete_service() to
 634          * do the rest of the setup on the service(s).
 635          */
 636         sock_fdpos = 0;
 637         port_pos = 0;
 638         nc_handle = setnetconfig();
 639         while ((nconf = getnetconfig(nc_handle))) {
 640                 if (nconf->nc_flag & NC_VISIBLE) {
 641                         if (have_v6 == 0 && strcmp(nconf->nc_protofmly,
 642                             "inet6") == 0) {
 643                                 /* DO NOTHING */
 644                         } else if (port_list != NULL) {
 645                                 if (port_pos >= port_len) {
 646                                         syslog(LOG_ERR, "too many port#s");
 647                                         exit(1);
 648                                 }
 649                                 complete_service(nconf, port_list[port_pos++]);
 650                         } else
 651                                 complete_service(nconf, svcport_str);
 652                 }
 653         }
 654         endnetconfig(nc_handle);
 655         free(sock_fd);
 656         if (port_list != NULL) {
 657                 for (port_pos = 0; port_pos < port_len; port_pos++)
 658                         free(port_list[port_pos]);
 659                 free(port_list);
 660         }
 661
 662         if (xcreated == 0) {
 663                 syslog(LOG_ERR, "could not create any services");
 664                 exit(1);
 665         }
 666
 667         /* Expand svc_run() here so that we can call get_exportlist(). */
 668         for (;;) {
 669                 if (got_sighup) {
 670                         get_exportlist(1);
 671                         got_sighup = 0;
 672                 }
 673                 readfds = svc_fdset;
 674                 switch (select(svc_maxfd + 1, &readfds, NULL, NULL, NULL)) {
 675                 case -1:
 676                         if (errno == EINTR)
 677                                 continue;
 678                         syslog(LOG_ERR, "mountd died: select: %m");
 679                         exit(1);
 680                 case 0:
 681                         continue;
 682                 default:
 683                         svc_getreqset(&readfds);
 684                 }
 685         }
 686 }
 687
 688 /*
 689  * This routine creates and binds sockets on the appropriate
 690  * addresses. It gets called one time for each transport.
 691  * It returns 0 upon success, 1 for ingore the call and -1 to indicate
 692  * bind failed with EADDRINUSE.
 693  * Any file descriptors that have been created are stored in sock_fd and
 694  * the total count of them is maintained in sock_fdcnt.
 695  */
 696 static int
 697 create_service(struct netconfig *nconf)
 698 {
 699         struct addrinfo hints, *res = NULL;
 700         struct sockaddr_in *sin;
 701         struct sockaddr_in6 *sin6;
 702         struct __rpc_sockinfo si;
 703         int aicode;
 704         int fd;
 705         int nhostsbak;
 706         int one = 1;
 707         int r;
 708         u_int32_t host_addr[4];  /* IPv4 or IPv6 */
 709         int mallocd_res;
 710
 711         if ((nconf->nc_semantics != NC_TPI_CLTS) &&
 712             (nconf->nc_semantics != NC_TPI_COTS) &&
 713             (nconf->nc_semantics != NC_TPI_COTS_ORD))
 714                 return (1);     /* not my type */
 715
 716         /*
 717          * XXX - using RPC library internal functions.
 718          */
 719         if (!__rpc_nconf2sockinfo(nconf, &si)) {
 720                 syslog(LOG_ERR, "cannot get information for %s",
 721                     nconf->nc_netid);
 722                 return (1);
 723         }
 724
 725         /* Get mountd's address on this transport */
 726         memset(&hints, 0, sizeof hints);
 727         hints.ai_family = si.si_af;
 728         hints.ai_socktype = si.si_socktype;
 729         hints.ai_protocol = si.si_proto;
 730
 731         /*
 732          * Bind to specific IPs if asked to
 733          */
 734         nhostsbak = nhosts;
 735         while (nhostsbak > 0) {
 736                 --nhostsbak;
 737                 sock_fd = realloc(sock_fd, (sock_fdcnt + 1) * sizeof(int));
 738                 if (sock_fd == NULL)
 739                         out_of_mem();
 740                 sock_fd[sock_fdcnt++] = -1;     /* Set invalid for now. */
 741                 mallocd_res = 0;
 742
 743                 hints.ai_flags = AI_PASSIVE;
 744
 745                 /*
 746                  * XXX - using RPC library internal functions.
 747                  */
 748                 if ((fd = __rpc_nconf2fd(nconf)) < 0) {
 749                         int non_fatal = 0;
 750                         if (errno == EAFNOSUPPORT &&
 751                             nconf->nc_semantics != NC_TPI_CLTS)
 752                                 non_fatal = 1;
 753
 754                         syslog(non_fatal ? LOG_DEBUG : LOG_ERR,
 755                             "cannot create socket for %s", nconf->nc_netid);
 756                         if (non_fatal != 0)
 757                                 continue;
 758                         exit(1);
 759                 }
 760
 761                 switch (hints.ai_family) {
 762                 case AF_INET:
 763                         if (inet_pton(AF_INET, hosts[nhostsbak],
 764                             host_addr) == 1) {
 765                                 hints.ai_flags |= AI_NUMERICHOST;
 766                         } else {
 767                                 /*
 768                                  * Skip if we have an AF_INET6 address.
 769                                  */
 770                                 if (inet_pton(AF_INET6, hosts[nhostsbak],
 771                                     host_addr) == 1) {
 772                                         close(fd);
 773                                         continue;
 774                                 }
 775                         }
 776                         break;
 777                 case AF_INET6:
 778                         if (inet_pton(AF_INET6, hosts[nhostsbak],
 779                             host_addr) == 1) {
 780                                 hints.ai_flags |= AI_NUMERICHOST;
 781                         } else {
 782                                 /*
 783                                  * Skip if we have an AF_INET address.
 784                                  */
 785                                 if (inet_pton(AF_INET, hosts[nhostsbak],
 786                                     host_addr) == 1) {
 787                                         close(fd);
 788                                         continue;
 789                                 }
 790                         }
 791
 792                         /*
 793                          * We're doing host-based access checks here, so don't
 794                          * allow v4-in-v6 to confuse things. The kernel will
 795                          * disable it by default on NFS sockets too.
 796                          */
 797                         if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one,
 798                             sizeof one) < 0) {
 799                                 syslog(LOG_ERR,
 800                                     "can't disable v4-in-v6 on IPv6 socket");
 801                                 exit(1);
 802                         }
 803                         break;
 804                 default:
 805                         break;
 806                 }
 807
 808                 /*
 809                  * If no hosts were specified, just bind to INADDR_ANY
 810                  */
 811                 if (strcmp("*", hosts[nhostsbak]) == 0) {
 812                         if (svcport_str == NULL) {
 813                                 res = malloc(sizeof(struct addrinfo));
 814                                 if (res == NULL)
 815                                         out_of_mem();
 816                                 mallocd_res = 1;
 817                                 res->ai_flags = hints.ai_flags;
 818                                 res->ai_family = hints.ai_family;
 819                                 res->ai_protocol = hints.ai_protocol;
 820                                 switch (res->ai_family) {
 821                                 case AF_INET:
 822                                         sin = malloc(sizeof(struct sockaddr_in));
 823                                         if (sin == NULL)
 824                                                 out_of_mem();
 825                                         sin->sin_family = AF_INET;
 826                                         sin->sin_port = htons(0);
 827                                         sin->sin_addr.s_addr = htonl(INADDR_ANY);
 828                                         res->ai_addr = (struct sockaddr*) sin;
 829                                         res->ai_addrlen = (socklen_t)
 830                                             sizeof(struct sockaddr_in);
 831                                         break;
 832                                 case AF_INET6:
 833                                         sin6 = malloc(sizeof(struct sockaddr_in6));
 834                                         if (sin6 == NULL)
 835                                                 out_of_mem();
 836                                         sin6->sin6_family = AF_INET6;
 837                                         sin6->sin6_port = htons(0);
 838                                         sin6->sin6_addr = in6addr_any;
 839                                         res->ai_addr = (struct sockaddr*) sin6;
 840                                         res->ai_addrlen = (socklen_t)
 841                                             sizeof(struct sockaddr_in6);
 842                                         break;
 843                                 default:
 844                                         syslog(LOG_ERR, "bad addr fam %d",
 845                                             res->ai_family);
 846                                         exit(1);
 847                                 }
 848                         } else {
 849                                 if ((aicode = getaddrinfo(NULL, svcport_str,
 850                                     &hints, &res)) != 0) {
 851                                         syslog(LOG_ERR,
 852                                             "cannot get local address for %s: %s",
 853                                             nconf->nc_netid,
 854                                             gai_strerror(aicode));
 855                                         close(fd);
 856                                         continue;
 857                                 }
 858                         }
 859                 } else {
 860                         if ((aicode = getaddrinfo(hosts[nhostsbak], svcport_str,
 861                             &hints, &res)) != 0) {
 862                                 syslog(LOG_ERR,
 863                                     "cannot get local address for %s: %s",
 864                                     nconf->nc_netid, gai_strerror(aicode));
 865                                 close(fd);
 866                                 continue;
 867                         }
 868                 }
 869
 870                 /* Store the fd. */
 871                 sock_fd[sock_fdcnt - 1] = fd;
 872
 873                 /* Now, attempt the bind. */
 874                 r = bindresvport_sa(fd, res->ai_addr);
 875                 if (r != 0) {
 876                         if (errno == EADDRINUSE && mallocd_svcport != 0) {
 877                                 if (mallocd_res != 0) {
 878                                         free(res->ai_addr);
 879                                         free(res);
 880                                 } else
 881                                         freeaddrinfo(res);
 882                                 return (-1);
 883                         }
 884                         syslog(LOG_ERR, "bindresvport_sa: %m");
 885                         exit(1);
 886                 }
 887
 888                 if (svcport_str == NULL) {
 889                         svcport_str = malloc(NI_MAXSERV * sizeof(char));
 890                         if (svcport_str == NULL)
 891                                 out_of_mem();
 892                         mallocd_svcport = 1;
 893
 894                         if (getnameinfo(res->ai_addr,
 895                             res->ai_addr->sa_len, NULL, NI_MAXHOST,
 896                             svcport_str, NI_MAXSERV * sizeof(char),
 897                             NI_NUMERICHOST | NI_NUMERICSERV))
 898                                 errx(1, "Cannot get port number");
 899                 }
 900                 if (mallocd_res != 0) {
 901                         free(res->ai_addr);
 902                         free(res);
 903                 } else
 904                         freeaddrinfo(res);
 905                 res = NULL;
 906         }
 907         return (0);
 908 }
 909
 910 /*
 911  * Called after all the create_service() calls have succeeded, to complete
 912  * the setup and registration.
 913  */
 914 static void
 915 complete_service(struct netconfig *nconf, char *port_str)
 916 {
 917         struct addrinfo hints, *res = NULL;
 918         struct __rpc_sockinfo si;
 919         struct netbuf servaddr;
 920         SVCXPRT *transp = NULL;
 921         int aicode, fd, nhostsbak;
 922         int registered = 0;
 923
 924         if ((nconf->nc_semantics != NC_TPI_CLTS) &&
 925             (nconf->nc_semantics != NC_TPI_COTS) &&
 926             (nconf->nc_semantics != NC_TPI_COTS_ORD))
 927                 return; /* not my type */
 928
 929         /*
 930          * XXX - using RPC library internal functions.
 931          */
 932         if (!__rpc_nconf2sockinfo(nconf, &si)) {
 933                 syslog(LOG_ERR, "cannot get information for %s",
 934                     nconf->nc_netid);
 935                 return;
 936         }
 937
 938         nhostsbak = nhosts;
 939         while (nhostsbak > 0) {
 940                 --nhostsbak;
 941                 if (sock_fdpos >= sock_fdcnt) {
 942                         /* Should never happen. */
 943                         syslog(LOG_ERR, "Ran out of socket fd's");
 944                         return;
 945                 }
 946                 fd = sock_fd[sock_fdpos++];
 947                 if (fd < 0)
 948                         continue;
 949
 950                 /*
 951                  * Using -1 tells listen(2) to use
 952                  * kern.ipc.soacceptqueue for the backlog.
 953                  */
 954                 if (nconf->nc_semantics != NC_TPI_CLTS)
 955                         listen(fd, -1);
 956
 957                 if (nconf->nc_semantics == NC_TPI_CLTS )
 958                         transp = svc_dg_create(fd, 0, 0);
 959                 else
 960                         transp = svc_vc_create(fd, RPC_MAXDATASIZE,
 961                             RPC_MAXDATASIZE);
 962
 963                 if (transp != (SVCXPRT *) NULL) {
 964                         if (!svc_reg(transp, MOUNTPROG, MOUNTVERS, mntsrv,
 965                             NULL))
 966                                 syslog(LOG_ERR,
 967                                     "can't register %s MOUNTVERS service",
 968                                     nconf->nc_netid);
 969                         if (!force_v2) {
 970                                 if (!svc_reg(transp, MOUNTPROG, MOUNTVERS3,
 971                                     mntsrv, NULL))
 972                                         syslog(LOG_ERR,
 973                                             "can't register %s MOUNTVERS3 service",
 974                                             nconf->nc_netid);
 975                         }
 976                 } else
 977                         syslog(LOG_WARNING, "can't create %s services",
 978                             nconf->nc_netid);
 979
 980                 if (registered == 0) {
 981                         registered = 1;
 982                         memset(&hints, 0, sizeof hints);
 983                         hints.ai_flags = AI_PASSIVE;
 984                         hints.ai_family = si.si_af;
 985                         hints.ai_socktype = si.si_socktype;
 986                         hints.ai_protocol = si.si_proto;
 987
 988                         if ((aicode = getaddrinfo(NULL, port_str, &hints,
 989                             &res)) != 0) {
 990                                 syslog(LOG_ERR, "cannot get local address: %s",
 991                                     gai_strerror(aicode));
 992                                 exit(1);
 993                         }
 994
 995                         servaddr.buf = malloc(res->ai_addrlen);
 996                         memcpy(servaddr.buf, res->ai_addr, res->ai_addrlen);
 997                         servaddr.len = res->ai_addrlen;
 998
 999                         rpcb_set(MOUNTPROG, MOUNTVERS, nconf, &servaddr);
1000                         rpcb_set(MOUNTPROG, MOUNTVERS3, nconf, &servaddr);
1001
1002                         xcreated++;
1003                         freeaddrinfo(res);
1004                 }
1005         } /* end while */
1006 }
1007
1008 /*
1009  * Clear out sockets after a failure to bind one of them, so that the
1010  * cycle of socket creation/binding can start anew.
1011  */
1012 static void
1013 clearout_service(void)
1014 {
1015         int i;
1016
1017         for (i = 0; i < sock_fdcnt; i++) {
1018                 if (sock_fd[i] >= 0) {
1019                         shutdown(sock_fd[i], SHUT_RDWR);
1020                         close(sock_fd[i]);
1021                 }
1022         }
1023 }
1024
1025 static void
1026 usage(void)
1027 {
1028         fprintf(stderr,
1029                 "usage: mountd [-2] [-d] [-e] [-l] [-n] [-p <port>] [-r] "
1030                 "[-S] [-h <bindip>] [export_file ...]\n");
1031         exit(1);
1032 }
1033
1034 /*
1035  * The mount rpc service
1036  */
1037 void
1038 mntsrv(struct svc_req *rqstp, SVCXPRT *transp)
1039 {
1040         struct exportlist *ep;
1041         struct dirlist *dp;
1042         struct fhreturn fhr;
1043         struct stat stb;
1044         struct statfs fsb;
1045         char host[NI_MAXHOST], numerichost[NI_MAXHOST];
1046         int lookup_failed = 1;
1047         struct sockaddr *saddr;
1048         u_short sport;
1049         char rpcpath[MNTPATHLEN + 1], dirpath[MAXPATHLEN];
1050         int bad = 0, defset, hostset;
1051         sigset_t sighup_mask;
1052         int numsecflavors, *secflavorsp;
1053
1054         sigemptyset(&sighup_mask);
1055         sigaddset(&sighup_mask, SIGHUP);
1056         saddr = svc_getrpccaller(transp)->buf;
1057         switch (saddr->sa_family) {
1058         case AF_INET6:
1059                 sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port);
1060                 break;
1061         case AF_INET:
1062                 sport = ntohs(((struct sockaddr_in *)saddr)->sin_port);
1063                 break;
1064         default:
1065                 syslog(LOG_ERR, "request from unknown address family");
1066                 return;
1067         }
1068         switch (rqstp->rq_proc) {
1069         case MOUNTPROC_MNT:
1070         case MOUNTPROC_UMNT:
1071         case MOUNTPROC_UMNTALL:
1072                 lookup_failed = getnameinfo(saddr, saddr->sa_len, host,
1073                     sizeof host, NULL, 0, 0);
1074         }
1075         getnameinfo(saddr, saddr->sa_len, numerichost,
1076             sizeof numerichost, NULL, 0, NI_NUMERICHOST);
1077         switch (rqstp->rq_proc) {
1078         case NULLPROC:
1079                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
1080                         syslog(LOG_ERR, "can't send reply");
1081                 return;
1082         case MOUNTPROC_MNT:
1083                 if (sport >= IPPORT_RESERVED && resvport_only) {
1084                         syslog(LOG_NOTICE,
1085                             "mount request from %s from unprivileged port",
1086                             numerichost);
1087                         svcerr_weakauth(transp);
1088                         return;
1089                 }
1090                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
1091                         syslog(LOG_NOTICE, "undecodable mount request from %s",
1092                             numerichost);
1093                         svcerr_decode(transp);
1094                         return;
1095                 }
1096
1097                 /*
1098                  * Get the real pathname and make sure it is a directory
1099                  * or a regular file if the -r option was specified
1100                  * and it exists.
1101                  */
1102                 if (realpath(rpcpath, dirpath) == NULL ||
1103                     stat(dirpath, &stb) < 0 ||
1104                     statfs(dirpath, &fsb) < 0) {
1105                         chdir("/");     /* Just in case realpath doesn't */
1106                         syslog(LOG_NOTICE,
1107                             "mount request from %s for non existent path %s",
1108                             numerichost, dirpath);
1109                         if (debug)
1110                                 warnx("stat failed on %s", dirpath);
1111                         bad = ENOENT;   /* We will send error reply later */
1112                 }
1113                 if (!bad &&
1114                     !S_ISDIR(stb.st_mode) &&
1115                     (dir_only || !S_ISREG(stb.st_mode))) {
1116                         syslog(LOG_NOTICE,
1117                             "mount request from %s for non-directory path %s",
1118                             numerichost, dirpath);
1119                         if (debug)
1120                                 warnx("mounting non-directory %s", dirpath);
1121                         bad = ENOTDIR;  /* We will send error reply later */
1122                 }
1123
1124                 /* Check in the exports list */
1125                 sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
1126                 if (bad)
1127                         ep = NULL;
1128                 else
1129                         ep = ex_search(&fsb.f_fsid, exphead);
1130                 hostset = defset = 0;
1131                 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset,
1132                     &numsecflavors, &secflavorsp) ||
1133                     ((dp = dirp_search(ep->ex_dirl, dirpath)) &&
1134                       chk_host(dp, saddr, &defset, &hostset, &numsecflavors,
1135                        &secflavorsp)) ||
1136                     (defset && scan_tree(ep->ex_defdir, saddr) == 0 &&
1137                      scan_tree(ep->ex_dirl, saddr) == 0))) {
1138                         if (bad) {
1139                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
1140                                     (caddr_t)&bad))
1141                                         syslog(LOG_ERR, "can't send reply");
1142                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1143                                 return;
1144                         }
1145                         if (hostset & DP_HOSTSET) {
1146                                 fhr.fhr_flag = hostset;
1147                                 fhr.fhr_numsecflavors = numsecflavors;
1148                                 fhr.fhr_secflavors = secflavorsp;
1149                         } else {
1150                                 fhr.fhr_flag = defset;
1151                                 fhr.fhr_numsecflavors = ep->ex_defnumsecflavors;
1152                                 fhr.fhr_secflavors = ep->ex_defsecflavors;
1153                         }
1154                         fhr.fhr_vers = rqstp->rq_vers;
1155                         /* Get the file handle */
1156                         memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t));
1157                         if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) {
1158                                 bad = errno;
1159                                 syslog(LOG_ERR, "can't get fh for %s", dirpath);
1160                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
1161                                     (caddr_t)&bad))
1162                                         syslog(LOG_ERR, "can't send reply");
1163                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1164                                 return;
1165                         }
1166                         if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs,
1167                             (caddr_t)&fhr))
1168                                 syslog(LOG_ERR, "can't send reply");
1169                         if (!lookup_failed)
1170                                 add_mlist(host, dirpath);
1171                         else
1172                                 add_mlist(numerichost, dirpath);
1173                         if (debug)
1174                                 warnx("mount successful");
1175                         if (dolog)
1176                                 syslog(LOG_NOTICE,
1177                                     "mount request succeeded from %s for %s",
1178                                     numerichost, dirpath);
1179                 } else {
1180                         if (!bad)
1181                                 bad = EACCES;
1182                         syslog(LOG_NOTICE,
1183                             "mount request denied from %s for %s",
1184                             numerichost, dirpath);
1185                 }
1186
1187                 if (bad && !svc_sendreply(transp, (xdrproc_t)xdr_long,
1188                     (caddr_t)&bad))
1189                         syslog(LOG_ERR, "can't send reply");
1190                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1191                 return;
1192         case MOUNTPROC_DUMP:
1193                 if (!svc_sendreply(transp, (xdrproc_t)xdr_mlist, (caddr_t)NULL))
1194                         syslog(LOG_ERR, "can't send reply");
1195                 else if (dolog)
1196                         syslog(LOG_NOTICE,
1197                             "dump request succeeded from %s",
1198                             numerichost);
1199                 return;
1200         case MOUNTPROC_UMNT:
1201                 if (sport >= IPPORT_RESERVED && resvport_only) {
1202                         syslog(LOG_NOTICE,
1203                             "umount request from %s from unprivileged port",
1204                             numerichost);
1205                         svcerr_weakauth(transp);
1206                         return;
1207                 }
1208                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
1209                         syslog(LOG_NOTICE, "undecodable umount request from %s",
1210                             numerichost);
1211                         svcerr_decode(transp);
1212                         return;
1213                 }
1214                 if (realpath(rpcpath, dirpath) == NULL) {
1215                         syslog(LOG_NOTICE, "umount request from %s "
1216                             "for non existent path %s",
1217                             numerichost, dirpath);
1218                 }
1219                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL))
1220                         syslog(LOG_ERR, "can't send reply");
1221                 if (!lookup_failed)
1222                         del_mlist(host, dirpath);
1223                 del_mlist(numerichost, dirpath);
1224                 if (dolog)
1225                         syslog(LOG_NOTICE,
1226                             "umount request succeeded from %s for %s",
1227                             numerichost, dirpath);
1228                 return;
1229         case MOUNTPROC_UMNTALL:
1230                 if (sport >= IPPORT_RESERVED && resvport_only) {
1231                         syslog(LOG_NOTICE,
1232                             "umountall request from %s from unprivileged port",
1233                             numerichost);
1234                         svcerr_weakauth(transp);
1235                         return;
1236                 }
1237                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL))
1238                         syslog(LOG_ERR, "can't send reply");
1239                 if (!lookup_failed)
1240                         del_mlist(host, NULL);
1241                 del_mlist(numerichost, NULL);
1242                 if (dolog)
1243                         syslog(LOG_NOTICE,
1244                             "umountall request succeeded from %s",
1245                             numerichost);
1246                 return;
1247         case MOUNTPROC_EXPORT:
1248                 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, (caddr_t)NULL))
1249                         if (!svc_sendreply(transp, (xdrproc_t)xdr_explist_brief,
1250                             (caddr_t)NULL))
1251                                 syslog(LOG_ERR, "can't send reply");
1252                 if (dolog)
1253                         syslog(LOG_NOTICE,
1254                             "export request succeeded from %s",
1255                             numerichost);
1256                 return;
1257         default:
1258                 svcerr_noproc(transp);
1259                 return;
1260         }
1261 }
1262
1263 /*
1264  * Xdr conversion for a dirpath string
1265  */
1266 static int
1267 xdr_dir(XDR *xdrsp, char *dirp)
1268 {
1269         return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
1270 }
1271
1272 /*
1273  * Xdr routine to generate file handle reply
1274  */
1275 static int
1276 xdr_fhs(XDR *xdrsp, caddr_t cp)
1277 {
1278         struct fhreturn *fhrp = (struct fhreturn *)cp;
1279         u_long ok = 0, len, auth;
1280         int i;
1281
1282         if (!xdr_long(xdrsp, &ok))
1283                 return (0);
1284         switch (fhrp->fhr_vers) {
1285         case 1:
1286                 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH));
1287         case 3:
1288                 len = NFSX_V3FH;
1289                 if (!xdr_long(xdrsp, &len))
1290                         return (0);
1291                 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len))
1292                         return (0);
1293                 if (fhrp->fhr_numsecflavors) {
1294                         if (!xdr_int(xdrsp, &fhrp->fhr_numsecflavors))
1295                                 return (0);
1296                         for (i = 0; i < fhrp->fhr_numsecflavors; i++)
1297                                 if (!xdr_int(xdrsp, &fhrp->fhr_secflavors[i]))
1298                                         return (0);
1299                         return (1);
1300                 } else {
1301                         auth = AUTH_SYS;
1302                         len = 1;
1303                         if (!xdr_long(xdrsp, &len))
1304                                 return (0);
1305                         return (xdr_long(xdrsp, &auth));
1306                 }
1307         }
1308         return (0);
1309 }
1310
1311 static int
1312 xdr_mlist(XDR *xdrsp, caddr_t cp __unused)
1313 {
1314         struct mountlist *mlp;
1315         int true = 1;
1316         int false = 0;
1317         char *strp;
1318
1319         SLIST_FOREACH(mlp, &mlhead, next) {
1320                 if (!xdr_bool(xdrsp, &true))
1321                         return (0);
1322                 strp = &mlp->ml_host[0];
1323                 if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
1324                         return (0);
1325                 strp = &mlp->ml_dirp[0];
1326                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1327                         return (0);
1328         }
1329         if (!xdr_bool(xdrsp, &false))
1330                 return (0);
1331         return (1);
1332 }
1333
1334 /*
1335  * Xdr conversion for export list
1336  */
1337 static int
1338 xdr_explist_common(XDR *xdrsp, caddr_t cp __unused, int brief)
1339 {
1340         struct exportlist *ep;
1341         int false = 0;
1342         int putdef;
1343         sigset_t sighup_mask;
1344         int i;
1345
1346         sigemptyset(&sighup_mask);
1347         sigaddset(&sighup_mask, SIGHUP);
1348         sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
1349
1350         for (i = 0; i < exphashsize; i++)
1351                 SLIST_FOREACH(ep, &exphead[i], entries) {
1352                         putdef = 0;
1353                         if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir,
1354                                        &putdef, brief))
1355                                 goto errout;
1356                         if (ep->ex_defdir && putdef == 0 &&
1357                                 put_exlist(ep->ex_defdir, xdrsp, NULL,
1358                                 &putdef, brief))
1359                                 goto errout;
1360                 }
1361         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1362         if (!xdr_bool(xdrsp, &false))
1363                 return (0);
1364         return (1);
1365 errout:
1366         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1367         return (0);
1368 }
1369
1370 /*
1371  * Called from xdr_explist() to traverse the tree and export the
1372  * directory paths.
1373  */
1374 static int
1375 put_exlist(struct dirlist *dp, XDR *xdrsp, struct dirlist *adp, int *putdefp,
1376         int brief)
1377 {
1378         struct grouplist *grp;
1379         struct hostlist *hp;
1380         int true = 1;
1381         int false = 0;
1382         int gotalldir = 0;
1383         char *strp;
1384
1385         if (dp) {
1386                 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp, brief))
1387                         return (1);
1388                 if (!xdr_bool(xdrsp, &true))
1389                         return (1);
1390                 strp = dp->dp_dirp;
1391                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1392                         return (1);
1393                 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) {
1394                         gotalldir = 1;
1395                         *putdefp = 1;
1396                 }
1397                 if (brief) {
1398                         if (!xdr_bool(xdrsp, &true))
1399                                 return (1);
1400                         strp = "(...)";
1401                         if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1402                                 return (1);
1403                 } else if ((dp->dp_flag & DP_DEFSET) == 0 &&
1404                     (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) {
1405                         hp = dp->dp_hosts;
1406                         while (hp) {
1407                                 grp = hp->ht_grp;
1408                                 if (grp->gr_type == GT_HOST) {
1409                                         if (!xdr_bool(xdrsp, &true))
1410                                                 return (1);
1411                                         strp = grp->gr_ptr.gt_addrinfo->ai_canonname;
1412                                         if (!xdr_string(xdrsp, &strp,
1413                                             MNTNAMLEN))
1414                                                 return (1);
1415                                 } else if (grp->gr_type == GT_NET) {
1416                                         if (!xdr_bool(xdrsp, &true))
1417                                                 return (1);
1418                                         strp = grp->gr_ptr.gt_net.nt_name;
1419                                         if (!xdr_string(xdrsp, &strp,
1420                                             MNTNAMLEN))
1421                                                 return (1);
1422                                 }
1423                                 hp = hp->ht_next;
1424                                 if (gotalldir && hp == (struct hostlist *)NULL) {
1425                                         hp = adp->dp_hosts;
1426                                         gotalldir = 0;
1427                                 }
1428                         }
1429                 }
1430                 if (!xdr_bool(xdrsp, &false))
1431                         return (1);
1432                 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp, brief))
1433                         return (1);
1434         }
1435         return (0);
1436 }
1437
1438 static int
1439 xdr_explist(XDR *xdrsp, caddr_t cp)
1440 {
1441
1442         return xdr_explist_common(xdrsp, cp, 0);
1443 }
1444
1445 static int
1446 xdr_explist_brief(XDR *xdrsp, caddr_t cp)
1447 {
1448
1449         return xdr_explist_common(xdrsp, cp, 1);
1450 }
1451
1452 static char *line;
1453 static size_t linesize;
1454 static FILE *exp_file;
1455
1456 /*
1457  * Get the export list from one, currently open file
1458  */
1459 static void
1460 get_exportlist_one(int passno)
1461 {
1462         struct exportlist *ep;
1463         struct grouplist *grp, *tgrp, *savgrp;
1464         struct dirlist *dirhead;
1465         struct statfs fsb;
1466         struct xucred anon;
1467         char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc;
1468         int len, has_host, exflags, got_nondir, dirplen, netgrp;
1469
1470         v4root_phase = 0;
1471         dirhead = (struct dirlist *)NULL;
1472         while (get_line()) {
1473                 if (debug)
1474                         warnx("got line %s", line);
1475                 cp = line;
1476                 nextfield(&cp, &endcp);
1477                 if (*cp == '#')
1478                         goto nextline;
1479
1480                 /*
1481                  * Set defaults.
1482                  */
1483                 has_host = FALSE;
1484                 anon = def_anon;
1485                 exflags = MNT_EXPORTED;
1486                 got_nondir = 0;
1487                 opt_flags = 0;
1488                 ep = (struct exportlist *)NULL;
1489                 dirp = NULL;
1490
1491                 /*
1492                  * Handle the V4 root dir.
1493                  */
1494                 if (*cp == 'V' && *(cp + 1) == '4' && *(cp + 2) == ':') {
1495                         /*
1496                          * V4: just indicates that it is the v4 root point,
1497                          * so skip over that and set v4root_phase.
1498                          */
1499                         if (v4root_phase > 0) {
1500                                 syslog(LOG_ERR, "V4:duplicate line, ignored");
1501                                 goto nextline;
1502                         }
1503                         v4root_phase = 1;
1504                         cp += 3;
1505                         nextfield(&cp, &endcp);
1506                 }
1507
1508                 /*
1509                  * Create new exports list entry
1510                  */
1511                 len = endcp-cp;
1512                 tgrp = grp = get_grp();
1513                 while (len > 0) {
1514                         if (len > MNTNAMLEN) {
1515                             getexp_err(ep, tgrp, "mountpoint too long");
1516                             goto nextline;
1517                         }
1518                         if (*cp == '-') {
1519                             if (ep == (struct exportlist *)NULL) {
1520                                 getexp_err(ep, tgrp,
1521                                     "flag before export path definition");
1522                                 goto nextline;
1523                             }
1524                             if (debug)
1525                                 warnx("doing opt %s", cp);
1526                             got_nondir = 1;
1527                             if (do_opt(&cp, &endcp, ep, grp, &has_host,
1528                                 &exflags, &anon)) {
1529                                 getexp_err(ep, tgrp, NULL);
1530                                 goto nextline;
1531                             }
1532                         } else if (*cp == '/') {
1533                             savedc = *endcp;
1534                             *endcp = '\0';
1535                             if (v4root_phase > 1) {
1536                                     if (dirp != NULL) {
1537                                         getexp_err(ep, tgrp, "Multiple V4 dirs");
1538                                         goto nextline;
1539                                     }
1540                             }
1541                             if (check_dirpath(cp) &&
1542                                 statfs(cp, &fsb) >= 0) {
1543                                 if ((fsb.f_flags & MNT_AUTOMOUNTED) != 0)
1544                                     syslog(LOG_ERR, "Warning: exporting of "
1545                                         "automounted fs %s not supported", cp);
1546                                 if (got_nondir) {
1547                                     getexp_err(ep, tgrp, "dirs must be first");
1548                                     goto nextline;
1549                                 }
1550                                 if (v4root_phase == 1) {
1551                                     if (dirp != NULL) {
1552                                         getexp_err(ep, tgrp, "Multiple V4 dirs");
1553                                         goto nextline;
1554                                     }
1555                                     if (strlen(v4root_dirpath) == 0) {
1556                                         strlcpy(v4root_dirpath, cp,
1557                                             sizeof (v4root_dirpath));
1558                                     } else if (strcmp(v4root_dirpath, cp)
1559                                         != 0) {
1560                                         syslog(LOG_ERR,
1561                                             "different V4 dirpath %s", cp);
1562                                         getexp_err(ep, tgrp, NULL);
1563                                         goto nextline;
1564                                     }
1565                                     dirp = cp;
1566                                     v4root_phase = 2;
1567                                     got_nondir = 1;
1568                                     ep = get_exp();
1569                                 } else {
1570                                     if (ep) {
1571                                         if (fsidcmp(&ep->ex_fs, &fsb.f_fsid)
1572                                             != 0) {
1573                                                 getexp_err(ep, tgrp,
1574                                                     "fsid mismatch");
1575                                                 goto nextline;
1576                                         }
1577                                     } else {
1578                                         /*
1579                                          * See if this directory is already
1580                                          * in the list.
1581                                          */
1582                                         ep = ex_search(&fsb.f_fsid, exphead);
1583                                         if (ep == (struct exportlist *)NULL) {
1584                                             ep = get_exp();
1585                                             ep->ex_fs = fsb.f_fsid;
1586                                             ep->ex_fsdir = strdup(fsb.f_mntonname);
1587                                             if (ep->ex_fsdir == NULL)
1588                                                 out_of_mem();
1589                                             if (debug)
1590                                                 warnx(
1591                                                   "making new ep fs=0x%x,0x%x",
1592                                                   fsb.f_fsid.val[0],
1593                                                   fsb.f_fsid.val[1]);
1594                                         } else if (debug)
1595                                             warnx("found ep fs=0x%x,0x%x",
1596                                                 fsb.f_fsid.val[0],
1597                                                 fsb.f_fsid.val[1]);
1598                                     }
1599
1600                                     /*
1601                                      * Add dirpath to export mount point.
1602                                      */
1603                                     dirp = add_expdir(&dirhead, cp, len);
1604                                     dirplen = len;
1605                                 }
1606                             } else {
1607                                 getexp_err(ep, tgrp,
1608                                     "symbolic link in export path or statfs failed");
1609                                 goto nextline;
1610                             }
1611                             *endcp = savedc;
1612                         } else {
1613                             savedc = *endcp;
1614                             *endcp = '\0';
1615                             got_nondir = 1;
1616                             if (ep == (struct exportlist *)NULL) {
1617                                 getexp_err(ep, tgrp,
1618                                     "host(s) before export path definition");
1619                                 goto nextline;
1620                             }
1621
1622                             /*
1623                              * Get the host or netgroup.
1624                              */
1625                             setnetgrent(cp);
1626                             netgrp = getnetgrent(&hst, &usr, &dom);
1627                             do {
1628                                 if (has_host) {
1629                                     grp->gr_next = get_grp();
1630                                     grp = grp->gr_next;
1631                                 }
1632                                 if (netgrp) {
1633                                     if (hst == 0) {
1634                                         syslog(LOG_ERR,
1635                                 "null hostname in netgroup %s, skipping", cp);
1636                                         grp->gr_type = GT_IGNORE;
1637                                     } else if (get_host(hst, grp, tgrp)) {
1638                                         syslog(LOG_ERR,
1639                         "bad host %s in netgroup %s, skipping", hst, cp);
1640                                         grp->gr_type = GT_IGNORE;
1641                                     }
1642                                 } else if (get_host(cp, grp, tgrp)) {
1643                                     syslog(LOG_ERR, "bad host %s, skipping", cp);
1644                                     grp->gr_type = GT_IGNORE;
1645                                 }
1646                                 has_host = TRUE;
1647                             } while (netgrp && getnetgrent(&hst, &usr, &dom));
1648                             endnetgrent();
1649                             *endcp = savedc;
1650                         }
1651                         cp = endcp;
1652                         nextfield(&cp, &endcp);
1653                         len = endcp - cp;
1654                 }
1655                 if (check_options(dirhead)) {
1656                         getexp_err(ep, tgrp, NULL);
1657                         goto nextline;
1658                 }
1659                 if (!has_host) {
1660                         grp->gr_type = GT_DEFAULT;
1661                         if (debug)
1662                                 warnx("adding a default entry");
1663
1664                 /*
1665                  * Don't allow a network export coincide with a list of
1666                  * host(s) on the same line.
1667                  */
1668                 } else if ((opt_flags & OP_NET) && tgrp->gr_next) {
1669                         getexp_err(ep, tgrp, "network/host conflict");
1670                         goto nextline;
1671
1672                 /*
1673                  * If an export list was specified on this line, make sure
1674                  * that we have at least one valid entry, otherwise skip it.
1675                  */
1676                 } else {
1677                         grp = tgrp;
1678                         while (grp && grp->gr_type == GT_IGNORE)
1679                                 grp = grp->gr_next;
1680                         if (! grp) {
1681                             getexp_err(ep, tgrp, "no valid entries");
1682                             goto nextline;
1683                         }
1684                 }
1685
1686                 if (v4root_phase == 1) {
1687                         getexp_err(ep, tgrp, "V4:root, no dirp, ignored");
1688                         goto nextline;
1689                 }
1690
1691                 /*
1692                  * Loop through hosts, pushing the exports into the kernel.
1693                  * After loop, tgrp points to the start of the list and
1694                  * grp points to the last entry in the list.
1695                  * Do not do the do_mount() for passno == 1, since the
1696                  * second pass will do it, as required.
1697                  */
1698                 grp = tgrp;
1699                 do {
1700                         grp->gr_exflags = exflags;
1701                         grp->gr_anon = anon;
1702                         if (v4root_phase == 2 && passno == 0)
1703                                 LOGDEBUG("do_mount v4root");
1704                         if (passno == 0 && do_mount(ep, grp, exflags, &anon,
1705                             dirp, dirplen, &fsb, ep->ex_numsecflavors,
1706                             ep->ex_secflavors)) {
1707                                 getexp_err(ep, tgrp, NULL);
1708                                 goto nextline;
1709                         }
1710                 } while (grp->gr_next && (grp = grp->gr_next));
1711
1712                 /*
1713                  * For V4: don't enter in mount lists.
1714                  */
1715                 if (v4root_phase > 0 && v4root_phase <= 2) {
1716                         /*
1717                          * These structures are used for the reload,
1718                          * so save them for that case.  Otherwise, just
1719                          * free them up now.
1720                          */
1721                         if (passno == 1 && ep != NULL) {
1722                                 savgrp = tgrp;
1723                                 while (tgrp != NULL) {
1724                                         /*
1725                                          * Save the security flavors and exflags
1726                                          * for this host set in the groups.
1727                                          */
1728                                         tgrp->gr_numsecflavors =
1729                                             ep->ex_numsecflavors;
1730                                         if (ep->ex_numsecflavors > 0)
1731                                                 memcpy(tgrp->gr_secflavors,
1732                                                     ep->ex_secflavors,
1733                                                     sizeof(ep->ex_secflavors));
1734                                         tgrp = tgrp->gr_next;
1735                                 }
1736                                 if (v4root_ep == NULL) {
1737                                         v4root_ep = ep;
1738                                         ep = NULL;      /* Don't free below. */
1739                                 }
1740                                 grp->gr_next = v4root_ep->ex_grphead;
1741                                 v4root_ep->ex_grphead = savgrp;
1742                         }
1743                         if (ep != NULL)
1744                                 free_exp(ep);
1745                         while (tgrp != NULL) {
1746                                 grp = tgrp;
1747                                 tgrp = tgrp->gr_next;
1748                                 free_grp(grp);
1749                         }
1750                         goto nextline;
1751                 }
1752
1753                 /*
1754                  * Success. Update the data structures.
1755                  */
1756                 if (has_host) {
1757                         hang_dirp(dirhead, tgrp, ep, opt_flags, &anon, exflags);
1758                         grp->gr_next = ep->ex_grphead;
1759                         ep->ex_grphead = tgrp;
1760                 } else {
1761                         hang_dirp(dirhead, (struct grouplist *)NULL, ep,
1762                                 opt_flags, &anon, exflags);
1763                         free_grp(grp);
1764                 }
1765                 dirhead = (struct dirlist *)NULL;
1766                 if ((ep->ex_flag & EX_LINKED) == 0) {
1767                         insert_exports(ep, exphead);
1768
1769                         ep->ex_flag |= EX_LINKED;
1770                 }
1771 nextline:
1772                 v4root_phase = 0;
1773                 if (dirhead) {
1774                         free_dir(dirhead);
1775                         dirhead = (struct dirlist *)NULL;
1776                 }
1777         }
1778 }
1779
1780 /*
1781  * Get the export list from all specified files
1782  */
1783 static void
1784 get_exportlist(int passno)
1785 {
1786         struct export_args export;
1787         struct iovec *iov;
1788         struct statfs *mntbufp;
1789         char errmsg[255];
1790         int num, i;
1791         int iovlen;
1792         struct nfsex_args eargs;
1793         FILE *debug_file;
1794
1795         if ((debug_file = fopen(_PATH_MOUNTDDEBUG, "r")) != NULL) {
1796                 fclose(debug_file);
1797                 logdebug = 1;
1798         } else
1799                 logdebug = 0;
1800         LOGDEBUG("passno=%d", passno);
1801         v4root_dirpath[0] = '\0';
1802         free_v4rootexp();
1803         if (passno == 1) {
1804                 /*
1805                  * Save the current lists as old ones, so that the new lists
1806                  * can be compared with the old ones in the 2nd pass.
1807                  */
1808                 for (i = 0; i < exphashsize; i++) {
1809                         SLIST_FIRST(&oldexphead[i]) = SLIST_FIRST(&exphead[i]);
1810                         SLIST_INIT(&exphead[i]);
1811                 }
1812
1813                 /* Note that the public fh has not yet been set. */
1814                 has_set_publicfh = 0;
1815
1816                 /* Read the export file(s) and process them */
1817                 read_exportfile(passno);
1818         } else {
1819                 /*
1820                  * Just make the old lists empty.
1821                  * exphashsize == 0 for the first call, before oldexphead
1822                  * has been initialized-->loop won't be executed.
1823                  */
1824                 for (i = 0; i < exphashsize; i++)
1825                         SLIST_INIT(&oldexphead[i]);
1826         }
1827
1828         bzero(&export, sizeof(export));
1829         export.ex_flags = MNT_DELEXPORT;
1830         iov = NULL;
1831         iovlen = 0;
1832         bzero(errmsg, sizeof(errmsg));
1833
1834         if (suspend_nfsd != 0)
1835                 (void)nfssvc(NFSSVC_SUSPENDNFSD, NULL);
1836         /*
1837          * Delete the old V4 root dir.
1838          */
1839         bzero(&eargs, sizeof (eargs));
1840         eargs.export.ex_flags = MNT_DELEXPORT;
1841         if (nfssvc(NFSSVC_V4ROOTEXPORT, (caddr_t)&eargs) < 0 &&
1842             errno != ENOENT)
1843                 syslog(LOG_ERR, "Can't delete exports for V4:");
1844
1845         build_iovec(&iov, &iovlen, "fstype", NULL, 0);
1846         build_iovec(&iov, &iovlen, "fspath", NULL, 0);
1847         build_iovec(&iov, &iovlen, "from", NULL, 0);
1848         build_iovec(&iov, &iovlen, "update", NULL, 0);
1849         build_iovec(&iov, &iovlen, "export", &export,
1850             sizeof(export));
1851         build_iovec(&iov, &iovlen, "errmsg", errmsg,
1852             sizeof(errmsg));
1853
1854         /*
1855          * For passno == 1, compare the old and new lists updating the kernel
1856          * exports for any cases that have changed.
1857          * This call is doing the second pass through the lists.
1858          * If it fails, fall back on the bulk reload.
1859          */
1860         if (passno == 1 && compare_nmount_exportlist(iov, iovlen, errmsg) ==
1861             0) {
1862                 LOGDEBUG("compareok");
1863                 /* Free up the old lists. */
1864                 free_exports(oldexphead);
1865         } else {
1866                 LOGDEBUG("doing passno=0");
1867                 /*
1868                  * Clear flag that notes if a public fh has been exported.
1869                  * It is set by do_mount() if MNT_EXPUBLIC is set for the entry.
1870                  */
1871                 has_publicfh = 0;
1872
1873                 /* exphead == NULL if not yet allocated (first call). */
1874                 if (exphead != NULL) {
1875                         /*
1876                          * First, get rid of the old lists.
1877                          */
1878                         free_exports(exphead);
1879                         free_exports(oldexphead);
1880                 }
1881
1882                 /*
1883                  * And delete exports that are in the kernel for all local
1884                  * filesystems.
1885                  * XXX: Should know how to handle all local exportable
1886                  * filesystems.
1887                  */
1888                 num = getmntinfo(&mntbufp, MNT_NOWAIT);
1889
1890                 /* Allocate hash tables, for first call. */
1891                 if (exphead == NULL) {
1892                         /* Target an average linked list length of 10. */
1893                         exphashsize = num / 10;
1894                         if (exphashsize < 1)
1895                                 exphashsize = 1;
1896                         else if (exphashsize > 100000)
1897                                 exphashsize = 100000;
1898                         exphead = malloc(exphashsize * sizeof(*exphead));
1899                         oldexphead = malloc(exphashsize * sizeof(*oldexphead));
1900                         if (exphead == NULL || oldexphead == NULL)
1901                                 errx(1, "Can't malloc hash tables");
1902
1903                         for (i = 0; i < exphashsize; i++) {
1904                                 SLIST_INIT(&exphead[i]);
1905                                 SLIST_INIT(&oldexphead[i]);
1906                         }
1907                 }
1908
1909                 for (i = 0; i < num; i++)
1910                         delete_export(iov, iovlen, &mntbufp[i], errmsg);
1911
1912
1913                 /* Read the export file(s) and process them */
1914                 read_exportfile(0);
1915         }
1916
1917         if (iov != NULL) {
1918                 /* Free strings allocated by strdup() in getmntopts.c */
1919                 free(iov[0].iov_base); /* fstype */
1920                 free(iov[2].iov_base); /* fspath */
1921                 free(iov[4].iov_base); /* from */
1922                 free(iov[6].iov_base); /* update */
1923                 free(iov[8].iov_base); /* export */
1924                 free(iov[10].iov_base); /* errmsg */
1925
1926                 /* free iov, allocated by realloc() */
1927                 free(iov);
1928                 iovlen = 0;
1929         }
1930
1931         /*
1932          * If there was no public fh, clear any previous one set.
1933          */
1934         if (has_publicfh == 0) {
1935                 LOGDEBUG("clear public fh");
1936                 (void) nfssvc(NFSSVC_NOPUBLICFH, NULL);
1937         }
1938
1939         /* Resume the nfsd. If they weren't suspended, this is harmless. */
1940         (void)nfssvc(NFSSVC_RESUMENFSD, NULL);
1941         LOGDEBUG("eo get_exportlist");
1942 }
1943
1944 /*
1945  * Insert an export entry in the appropriate list.
1946  */
1947 static void
1948 insert_exports(struct exportlist *ep, struct exportlisthead *exhp)
1949 {
1950         uint32_t i;
1951
1952         i = EXPHASH(&ep->ex_fs);
1953         LOGDEBUG("fs=%s hash=%i", ep->ex_fsdir, i);
1954         SLIST_INSERT_HEAD(&exhp[i], ep, entries);
1955 }
1956
1957 /*
1958  * Free up the exports lists passed in as arguments.
1959  */
1960 static void
1961 free_exports(struct exportlisthead *exhp)
1962 {
1963         struct exportlist *ep, *ep2;
1964         int i;
1965
1966         for (i = 0; i < exphashsize; i++) {
1967                 SLIST_FOREACH_SAFE(ep, &exhp[i], entries, ep2) {
1968                         SLIST_REMOVE(&exhp[i], ep, exportlist, entries);
1969                         free_exp(ep);
1970                 }
1971                 SLIST_INIT(&exhp[i]);
1972         }
1973 }
1974
1975 /*
1976  * Read the exports file(s) and call get_exportlist_one() for each line.
1977  */
1978 static void
1979 read_exportfile(int passno)
1980 {
1981         int done, i;
1982
1983         /*
1984          * Read in the exports file and build the list, calling
1985          * nmount() as we go along to push the export rules into the kernel.
1986          */
1987         done = 0;
1988         for (i = 0; exnames[i] != NULL; i++) {
1989                 if (debug)
1990                         warnx("reading exports from %s", exnames[i]);
1991                 if ((exp_file = fopen(exnames[i], "r")) == NULL) {
1992                         syslog(LOG_WARNING, "can't open %s", exnames[i]);
1993                         continue;
1994                 }
1995                 get_exportlist_one(passno);
1996                 fclose(exp_file);
1997                 done++;
1998         }
1999         if (done == 0) {
2000                 syslog(LOG_ERR, "can't open any exports file");
2001                 exit(2);
2002         }
2003 }
2004
2005 /*
2006  * Compare the export lists against the old ones and do nmount() operations
2007  * for any cases that have changed.  This avoids doing nmount() for entries
2008  * that have not changed.
2009  * Return 0 upon success, 1 otherwise.
2010  */
2011 static int
2012 compare_nmount_exportlist(struct iovec *iov, int iovlen, char *errmsg)
2013 {
2014         struct exportlist *ep, *oep;
2015         struct grouplist *grp;
2016         struct statfs fs, ofs;
2017         int i, ret;
2018
2019         /*
2020          * Loop through the current list and look for an entry in the old
2021          * list.
2022          * If found, check to see if it the same.
2023          *        If it is not the same, delete and re-export.
2024          *        Then mark it done on the old list.
2025          * else (not found)
2026          *        export it.
2027          * Any entries left in the old list after processing must have their
2028          * exports deleted.
2029          */
2030         for (i = 0; i < exphashsize; i++)
2031                 SLIST_FOREACH(ep, &exphead[i], entries) {
2032                         LOGDEBUG("foreach ep=%s", ep->ex_fsdir);
2033                         oep = ex_search(&ep->ex_fs, oldexphead);
2034                         if (oep != NULL) {
2035                                 /*
2036                                  * Check the mount paths are the same.
2037                                  * If not, return 1 so that the reload of the
2038                                  * exports will be done in bulk, the
2039                                  * passno == 0 way.
2040                                  */
2041                                 LOGDEBUG("found old exp");
2042                                 if (strcmp(ep->ex_fsdir, oep->ex_fsdir) != 0)
2043                                         return (1);
2044                                 LOGDEBUG("same fsdir");
2045                                 /*
2046                                  * Test to see if the entry is the same.
2047                                  * If not the same delete exports and
2048                                  * re-export.
2049                                  */
2050                                 if (compare_export(ep, oep) != 0) {
2051                                         /*
2052                                          * Clear has_publicfh if if was set
2053                                          * in the old exports, but only if it
2054                                          * has not been set during processing of
2055                                          * the exports for this pass, as
2056                                          * indicated by has_set_publicfh.
2057                                          */
2058                                         if (has_set_publicfh == 0 &&
2059                                             (oep->ex_flag & EX_PUBLICFH) != 0)
2060                                                 has_publicfh = 0;
2061
2062                                         /* Delete and re-export. */
2063                                         if (statfs(ep->ex_fsdir, &fs) < 0)
2064                                                 return (1);
2065                                         delete_export(iov, iovlen, &fs, errmsg);
2066                                         ret = do_export_mount(ep, &fs);
2067                                         if (ret != 0)
2068                                                 return (ret);
2069                                 }
2070                                 oep->ex_flag |= EX_DONE;
2071                                 LOGDEBUG("exdone");
2072                         } else {
2073                                 LOGDEBUG("not found so export");
2074                                 /* Not found, so do export. */
2075                                 if (statfs(ep->ex_fsdir, &fs) < 0)
2076                                         return (1);
2077                                 ret = do_export_mount(ep, &fs);
2078                                 if (ret != 0)
2079                                         return (ret);
2080                         }
2081                 }
2082
2083         /* Delete exports not done. */
2084         for (i = 0; i < exphashsize; i++)
2085                 SLIST_FOREACH(oep, &oldexphead[i], entries) {
2086                         if ((oep->ex_flag & EX_DONE) == 0) {
2087                                 LOGDEBUG("not done delete=%s", oep->ex_fsdir);
2088                                 if (statfs(oep->ex_fsdir, &ofs) >= 0 &&
2089                                     fsidcmp(&oep->ex_fs, &ofs.f_fsid) == 0) {
2090                                         LOGDEBUG("do delete");
2091                                         /*
2092                                          * Clear has_publicfh if if was set
2093                                          * in the old exports, but only if it
2094                                          * has not been set during processing of
2095                                          * the exports for this pass, as
2096                                          * indicated by has_set_publicfh.
2097                                          */
2098                                         if (has_set_publicfh == 0 &&
2099                                             (oep->ex_flag & EX_PUBLICFH) != 0)
2100                                                 has_publicfh = 0;
2101
2102                                         delete_export(iov, iovlen, &ofs,
2103                                             errmsg);
2104                                 }
2105                         }
2106                 }
2107
2108         /* Do the V4 root exports, as required. */
2109         grp = NULL;
2110         if (v4root_ep != NULL)
2111                 grp = v4root_ep->ex_grphead;
2112         v4root_phase = 2;
2113         while (v4root_ep != NULL && grp != NULL) {
2114                 LOGDEBUG("v4root expath=%s", v4root_dirpath);
2115                 ret = do_mount(v4root_ep, grp, grp->gr_exflags, &grp->gr_anon,
2116                     v4root_dirpath, strlen(v4root_dirpath), &fs,
2117                     grp->gr_numsecflavors, grp->gr_secflavors);
2118                 if (ret != 0) {
2119                         v4root_phase = 0;
2120                         return (ret);
2121                 }
2122                 grp = grp->gr_next;
2123         }
2124         v4root_phase = 0;
2125         free_v4rootexp();
2126         return (0);
2127 }
2128
2129 /*
2130  * Compare old and current exportlist entries for the fsid and return 0
2131  * if they are the same, 1 otherwise.
2132  */
2133 static int
2134 compare_export(struct exportlist *ep, struct exportlist *oep)
2135 {
2136         struct grouplist *grp, *ogrp;
2137
2138         if (strcmp(ep->ex_fsdir, oep->ex_fsdir) != 0)
2139                 return (1);
2140         if ((ep->ex_flag & EX_DEFSET) != (oep->ex_flag & EX_DEFSET))
2141                 return (1);
2142         if ((ep->ex_defdir != NULL && oep->ex_defdir == NULL) ||
2143             (ep->ex_defdir == NULL && oep->ex_defdir != NULL))
2144                 return (1);
2145         if (ep->ex_defdir != NULL && (ep->ex_defdir->dp_flag & DP_DEFSET) !=
2146             (oep->ex_defdir->dp_flag & DP_DEFSET))
2147                 return (1);
2148         if ((ep->ex_flag & EX_DEFSET) != 0 && (ep->ex_defnumsecflavors !=
2149             oep->ex_defnumsecflavors || ep->ex_defexflags !=
2150             oep->ex_defexflags || compare_cred(&ep->ex_defanon,
2151             &oep->ex_defanon) != 0 || compare_secflavor(ep->ex_defsecflavors,
2152             oep->ex_defsecflavors, ep->ex_defnumsecflavors) != 0))
2153                 return (1);
2154
2155         /* Now, check all the groups. */
2156         for (ogrp = oep->ex_grphead; ogrp != NULL; ogrp = ogrp->gr_next)
2157                 ogrp->gr_flag = 0;
2158         for (grp = ep->ex_grphead; grp != NULL; grp = grp->gr_next) {
2159                 for (ogrp = oep->ex_grphead; ogrp != NULL; ogrp =
2160                     ogrp->gr_next)
2161                         if ((ogrp->gr_flag & GR_FND) == 0 &&
2162                             grp->gr_numsecflavors == ogrp->gr_numsecflavors &&
2163                             grp->gr_exflags == ogrp->gr_exflags &&
2164                             compare_cred(&grp->gr_anon, &ogrp->gr_anon) == 0 &&
2165                             compare_secflavor(grp->gr_secflavors,
2166                             ogrp->gr_secflavors, grp->gr_numsecflavors) == 0)
2167                                 break;
2168                 if (ogrp != NULL)
2169                         ogrp->gr_flag |= GR_FND;
2170                 else
2171                         return (1);
2172         }
2173         for (ogrp = oep->ex_grphead; ogrp != NULL; ogrp = ogrp->gr_next)
2174                 if ((ogrp->gr_flag & GR_FND) == 0)
2175                         return (1);
2176         return (0);
2177 }
2178
2179 /*
2180  * This algorithm compares two arrays of "n" items. It returns 0 if they are
2181  * the "same" and 1 otherwise.  Although suboptimal, it is always safe to
2182  * return 1, which makes compare_nmount_export() reload the exports entry.
2183  * "same" refers to having the same set of values in the two arrays.
2184  * The arrays are in no particular order and duplicates (multiple entries
2185  * in an array with the same value) is allowed.
2186  * The algorithm is inefficient, but the common case of indentical arrays is
2187  * handled first and "n" is normally fairly small.
2188  * Since the two functions need the same algorithm but for arrays of
2189  * different types (gid_t vs int), this is done as a macro.
2190  */
2191 #define COMPARE_ARRAYS(a1, a2, n)                                       \
2192         do {                                                            \
2193                 int fnd, fndarray[(n)], i, j;                           \
2194                 /* Handle common case of identical arrays. */           \
2195                 for (i = 0; i < (n); i++)                               \
2196                         if ((a1)[i] != (a2)[i])                         \
2197                                 break;                                  \
2198                 if (i == (n))                                           \
2199                         return (0);                                     \
2200                 for (i = 0; i < (n); i++)                               \
2201                         fndarray[i] = 0;                                \
2202                 for (i = 0; i < (n); i++) {                             \
2203                         fnd = 0;                                        \
2204                         for (j = 0; j < (n); j++) {                     \
2205                                 if ((a1)[i] == (a2)[j]) {               \
2206                                         fndarray[j] = 1;                \
2207                                         fnd = 1;                        \
2208                                 }                                       \
2209                         }                                               \
2210                         if (fnd == 0)                                   \
2211                                 return (1);                             \
2212                 }                                                       \
2213                 for (i = 0; i < (n); i++)                               \
2214                         if (fndarray[i] == 0)                           \
2215                                 return (1);                             \
2216                 return (0);                                             \
2217         } while (0)
2218
2219 /*
2220  * Compare to struct xucred's.  Return 0 if the same and 1 otherwise.
2221  */
2222 static int
2223 compare_cred(struct xucred *cr0, struct xucred *cr1)
2224 {
2225
2226         if (cr0->cr_uid != cr1->cr_uid || cr0->cr_ngroups != cr1->cr_ngroups)
2227                 return (1);
2228
2229         COMPARE_ARRAYS(cr0->cr_groups, cr1->cr_groups, cr0->cr_ngroups);
2230 }
2231
2232 /*
2233  * Compare two lists of security flavors.  Return 0 if the same and 1 otherwise.
2234  */
2235 static int
2236 compare_secflavor(int *sec1, int *sec2, int nsec)
2237 {
2238
2239         COMPARE_ARRAYS(sec1, sec2, nsec);
2240 }
2241
2242 /*
2243  * Delete an exports entry.
2244  */
2245 static void
2246 delete_export(struct iovec *iov, int iovlen, struct statfs *fsp, char *errmsg)
2247 {
2248         struct xvfsconf vfc;
2249
2250         if (getvfsbyname(fsp->f_fstypename, &vfc) != 0) {
2251                 syslog(LOG_ERR, "getvfsbyname() failed for %s",
2252                     fsp->f_fstypename);
2253                 return;
2254         }
2255
2256         /*
2257          * We do not need to delete "export" flag from
2258          * filesystems that do not have it set.
2259          */
2260         if (!(fsp->f_flags & MNT_EXPORTED))
2261                 return;
2262         /*
2263          * Do not delete export for network filesystem by
2264          * passing "export" arg to nmount().
2265          * It only makes sense to do this for local filesystems.
2266          */
2267         if (vfc.vfc_flags & VFCF_NETWORK)
2268                 return;
2269
2270         iov[1].iov_base = fsp->f_fstypename;
2271         iov[1].iov_len = strlen(fsp->f_fstypename) + 1;
2272         iov[3].iov_base = fsp->f_mntonname;
2273         iov[3].iov_len = strlen(fsp->f_mntonname) + 1;
2274         iov[5].iov_base = fsp->f_mntfromname;
2275         iov[5].iov_len = strlen(fsp->f_mntfromname) + 1;
2276         errmsg[0] = '\0';
2277
2278         /*
2279          * EXDEV is returned when path exists but is not a
2280          * mount point.  May happens if raced with unmount.
2281          */
2282         if (nmount(iov, iovlen, fsp->f_flags) < 0 && errno != ENOENT &&
2283             errno != ENOTSUP && errno != EXDEV) {
2284                 syslog(LOG_ERR,
2285                     "can't delete exports for %s: %m %s",
2286                     fsp->f_mntonname, errmsg);
2287         }
2288 }
2289
2290 /*
2291  * Allocate an export list element
2292  */
2293 static struct exportlist *
2294 get_exp(void)
2295 {
2296         struct exportlist *ep;
2297
2298         ep = (struct exportlist *)calloc(1, sizeof (struct exportlist));
2299         if (ep == (struct exportlist *)NULL)
2300                 out_of_mem();
2301         return (ep);
2302 }
2303
2304 /*
2305  * Allocate a group list element
2306  */
2307 static struct grouplist *
2308 get_grp(void)
2309 {
2310         struct grouplist *gp;
2311
2312         gp = (struct grouplist *)calloc(1, sizeof (struct grouplist));
2313         if (gp == (struct grouplist *)NULL)
2314                 out_of_mem();
2315         return (gp);
2316 }
2317
2318 /*
2319  * Clean up upon an error in get_exportlist().
2320  */
2321 static void
2322 getexp_err(struct exportlist *ep, struct grouplist *grp, const char *reason)
2323 {
2324         struct grouplist *tgrp;
2325
2326         if (!(opt_flags & OP_QUIET)) {
2327                 if (reason != NULL)
2328                         syslog(LOG_ERR, "bad exports list line '%s': %s", line,
2329                             reason);
2330                 else
2331                         syslog(LOG_ERR, "bad exports list line '%s'", line);
2332         }
2333         if (ep && (ep->ex_flag & EX_LINKED) == 0)
2334                 free_exp(ep);
2335         while (grp) {
2336                 tgrp = grp;
2337                 grp = grp->gr_next;
2338                 free_grp(tgrp);
2339         }
2340 }
2341
2342 /*
2343  * Search the export list for a matching fs.
2344  */
2345 static struct exportlist *
2346 ex_search(fsid_t *fsid, struct exportlisthead *exhp)
2347 {
2348         struct exportlist *ep;
2349         uint32_t i;
2350
2351         i = EXPHASH(fsid);
2352         SLIST_FOREACH(ep, &exhp[i], entries) {
2353                 if (fsidcmp(&ep->ex_fs, fsid) == 0)
2354                         return (ep);
2355         }
2356
2357         return (ep);
2358 }
2359
2360 /*
2361  * Add a directory path to the list.
2362  */
2363 static char *
2364 add_expdir(struct dirlist **dpp, char *cp, int len)
2365 {
2366         struct dirlist *dp;
2367
2368         dp = malloc(sizeof (struct dirlist));
2369         if (dp == (struct dirlist *)NULL)
2370                 out_of_mem();
2371         dp->dp_left = *dpp;
2372         dp->dp_right = (struct dirlist *)NULL;
2373         dp->dp_flag = 0;
2374         dp->dp_hosts = (struct hostlist *)NULL;
2375         dp->dp_dirp = strndup(cp, len);
2376         if (dp->dp_dirp == NULL)
2377                 out_of_mem();
2378         *dpp = dp;
2379         return (dp->dp_dirp);
2380 }
2381
2382 /*
2383  * Hang the dir list element off the dirpath binary tree as required
2384  * and update the entry for host.
2385  */
2386 static void
2387 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep,
2388         int flags, struct xucred *anoncrp, int exflags)
2389 {
2390         struct hostlist *hp;
2391         struct dirlist *dp2;
2392
2393         if (flags & OP_ALLDIRS) {
2394                 if (ep->ex_defdir)
2395                         free((caddr_t)dp);
2396                 else
2397                         ep->ex_defdir = dp;
2398                 if (grp == (struct grouplist *)NULL) {
2399                         ep->ex_flag |= EX_DEFSET;
2400                         ep->ex_defdir->dp_flag |= DP_DEFSET;
2401                         /* Save the default security flavors list. */
2402                         ep->ex_defnumsecflavors = ep->ex_numsecflavors;
2403                         if (ep->ex_numsecflavors > 0)
2404                                 memcpy(ep->ex_defsecflavors, ep->ex_secflavors,
2405                                     sizeof(ep->ex_secflavors));
2406                         ep->ex_defanon = *anoncrp;
2407                         ep->ex_defexflags = exflags;
2408                 } else while (grp) {
2409                         hp = get_ht();
2410                         hp->ht_grp = grp;
2411                         hp->ht_next = ep->ex_defdir->dp_hosts;
2412                         ep->ex_defdir->dp_hosts = hp;
2413                         /* Save the security flavors list for this host set. */
2414                         grp->gr_numsecflavors = ep->ex_numsecflavors;
2415                         if (ep->ex_numsecflavors > 0)
2416                                 memcpy(grp->gr_secflavors, ep->ex_secflavors,
2417                                     sizeof(ep->ex_secflavors));
2418                         grp = grp->gr_next;
2419                 }
2420         } else {
2421
2422                 /*
2423                  * Loop through the directories adding them to the tree.
2424                  */
2425                 while (dp) {
2426                         dp2 = dp->dp_left;
2427                         add_dlist(&ep->ex_dirl, dp, grp, flags, ep, anoncrp,
2428                             exflags);
2429                         dp = dp2;
2430                 }
2431         }
2432 }
2433
2434 /*
2435  * Traverse the binary tree either updating a node that is already there
2436  * for the new directory or adding the new node.
2437  */
2438 static void
2439 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp,
2440         int flags, struct exportlist *ep, struct xucred *anoncrp, int exflags)
2441 {
2442         struct dirlist *dp;
2443         struct hostlist *hp;
2444         int cmp;
2445
2446         dp = *dpp;
2447         if (dp) {
2448                 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp);
2449                 if (cmp > 0) {
2450                         add_dlist(&dp->dp_left, newdp, grp, flags, ep, anoncrp,
2451                             exflags);
2452                         return;
2453                 } else if (cmp < 0) {
2454                         add_dlist(&dp->dp_right, newdp, grp, flags, ep, anoncrp,
2455                             exflags);
2456                         return;
2457                 } else
2458                         free((caddr_t)newdp);
2459         } else {
2460                 dp = newdp;
2461                 dp->dp_left = (struct dirlist *)NULL;
2462                 *dpp = dp;
2463         }
2464         if (grp) {
2465
2466                 /*
2467                  * Hang all of the host(s) off of the directory point.
2468                  */
2469                 do {
2470                         hp = get_ht();
2471                         hp->ht_grp = grp;
2472                         hp->ht_next = dp->dp_hosts;
2473                         dp->dp_hosts = hp;
2474                         /* Save the security flavors list for this host set. */
2475                         grp->gr_numsecflavors = ep->ex_numsecflavors;
2476                         if (ep->ex_numsecflavors > 0)
2477                                 memcpy(grp->gr_secflavors, ep->ex_secflavors,
2478                                     sizeof(ep->ex_secflavors));
2479                         grp = grp->gr_next;
2480                 } while (grp);
2481         } else {
2482                 ep->ex_flag |= EX_DEFSET;
2483                 dp->dp_flag |= DP_DEFSET;
2484                 /* Save the default security flavors list. */
2485                 ep->ex_defnumsecflavors = ep->ex_numsecflavors;
2486                 if (ep->ex_numsecflavors > 0)
2487                         memcpy(ep->ex_defsecflavors, ep->ex_secflavors,
2488                             sizeof(ep->ex_secflavors));
2489                 ep->ex_defanon = *anoncrp;
2490                 ep->ex_defexflags = exflags;
2491         }
2492 }
2493
2494 /*
2495  * Search for a dirpath on the export point.
2496  */
2497 static struct dirlist *
2498 dirp_search(struct dirlist *dp, char *dirp)
2499 {
2500         int cmp;
2501
2502         if (dp) {
2503                 cmp = strcmp(dp->dp_dirp, dirp);
2504                 if (cmp > 0)
2505                         return (dirp_search(dp->dp_left, dirp));
2506                 else if (cmp < 0)
2507                         return (dirp_search(dp->dp_right, dirp));
2508                 else
2509                         return (dp);
2510         }
2511         return (dp);
2512 }
2513
2514 /*
2515  * Scan for a host match in a directory tree.
2516  */
2517 static int
2518 chk_host(struct dirlist *dp, struct sockaddr *saddr, int *defsetp,
2519         int *hostsetp, int *numsecflavors, int **secflavorsp)
2520 {
2521         struct hostlist *hp;
2522         struct grouplist *grp;
2523         struct addrinfo *ai;
2524
2525         if (dp) {
2526                 if (dp->dp_flag & DP_DEFSET)
2527                         *defsetp = dp->dp_flag;
2528                 hp = dp->dp_hosts;
2529                 while (hp) {
2530                         grp = hp->ht_grp;
2531                         switch (grp->gr_type) {
2532                         case GT_HOST:
2533                                 ai = grp->gr_ptr.gt_addrinfo;
2534                                 for (; ai; ai = ai->ai_next) {
2535                                         if (!sacmp(ai->ai_addr, saddr, NULL)) {
2536                                                 *hostsetp =
2537                                                     (hp->ht_flag | DP_HOSTSET);
2538                                                 if (numsecflavors != NULL) {
2539                                                         *numsecflavors =
2540                                                             grp->gr_numsecflavors;
2541                                                         *secflavorsp =
2542                                                             grp->gr_secflavors;
2543                                                 }
2544                                                 return (1);
2545                                         }
2546                                 }
2547                                 break;
2548                         case GT_NET:
2549                                 if (!sacmp(saddr, (struct sockaddr *)
2550                                     &grp->gr_ptr.gt_net.nt_net,
2551                                     (struct sockaddr *)
2552                                     &grp->gr_ptr.gt_net.nt_mask)) {
2553                                         *hostsetp = (hp->ht_flag | DP_HOSTSET);
2554                                         if (numsecflavors != NULL) {
2555                                                 *numsecflavors =
2556                                                     grp->gr_numsecflavors;
2557                                                 *secflavorsp =
2558                                                     grp->gr_secflavors;
2559                                         }
2560                                         return (1);
2561                                 }
2562                                 break;
2563                         }
2564                         hp = hp->ht_next;
2565                 }
2566         }
2567         return (0);
2568 }
2569
2570 /*
2571  * Scan tree for a host that matches the address.
2572  */
2573 static int
2574 scan_tree(struct dirlist *dp, struct sockaddr *saddr)
2575 {
2576         int defset, hostset;
2577
2578         if (dp) {
2579                 if (scan_tree(dp->dp_left, saddr))
2580                         return (1);
2581                 if (chk_host(dp, saddr, &defset, &hostset, NULL, NULL))
2582                         return (1);
2583                 if (scan_tree(dp->dp_right, saddr))
2584                         return (1);
2585         }
2586         return (0);
2587 }
2588
2589 /*
2590  * Traverse the dirlist tree and free it up.
2591  */
2592 static void
2593 free_dir(struct dirlist *dp)
2594 {
2595
2596         if (dp) {
2597                 free_dir(dp->dp_left);
2598                 free_dir(dp->dp_right);
2599                 free_host(dp->dp_hosts);
2600                 free(dp->dp_dirp);
2601                 free(dp);
2602         }
2603 }
2604
2605 /*
2606  * Parse a colon separated list of security flavors
2607  */
2608 static int
2609 parsesec(char *seclist, struct exportlist *ep)
2610 {
2611         char *cp, savedc;
2612         int flavor;
2613
2614         ep->ex_numsecflavors = 0;
2615         for (;;) {
2616                 cp = strchr(seclist, ':');
2617                 if (cp) {
2618                         savedc = *cp;
2619                         *cp = '\0';
2620                 }
2621
2622                 if (!strcmp(seclist, "sys"))
2623                         flavor = AUTH_SYS;
2624                 else if (!strcmp(seclist, "krb5"))
2625                         flavor = RPCSEC_GSS_KRB5;
2626                 else if (!strcmp(seclist, "krb5i"))
2627                         flavor = RPCSEC_GSS_KRB5I;
2628                 else if (!strcmp(seclist, "krb5p"))
2629                         flavor = RPCSEC_GSS_KRB5P;
2630                 else {
2631                         if (cp)
2632                                 *cp = savedc;
2633                         syslog(LOG_ERR, "bad sec flavor: %s", seclist);
2634                         return (1);
2635                 }
2636                 if (ep->ex_numsecflavors == MAXSECFLAVORS) {
2637                         if (cp)
2638                                 *cp = savedc;
2639                         syslog(LOG_ERR, "too many sec flavors: %s", seclist);
2640                         return (1);
2641                 }
2642                 ep->ex_secflavors[ep->ex_numsecflavors] = flavor;
2643                 ep->ex_numsecflavors++;
2644                 if (cp) {
2645                         *cp = savedc;
2646                         seclist = cp + 1;
2647                 } else {
2648                         break;
2649                 }
2650         }
2651         return (0);
2652 }
2653
2654 /*
2655  * Parse the option string and update fields.
2656  * Option arguments may either be -<option>=<value> or
2657  * -<option> <value>
2658  */
2659 static int
2660 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp,
2661         int *has_hostp, int *exflagsp, struct xucred *cr)
2662 {
2663         char *cpoptarg, *cpoptend;
2664         char *cp, *endcp, *cpopt, savedc, savedc2;
2665         int allflag, usedarg;
2666
2667         savedc2 = '\0';
2668         cpopt = *cpp;
2669         cpopt++;
2670         cp = *endcpp;
2671         savedc = *cp;
2672         *cp = '\0';
2673         while (cpopt && *cpopt) {
2674                 allflag = 1;
2675                 usedarg = -2;
2676                 if ((cpoptend = strchr(cpopt, ','))) {
2677                         *cpoptend++ = '\0';
2678                         if ((cpoptarg = strchr(cpopt, '=')))
2679                                 *cpoptarg++ = '\0';
2680                 } else {
2681                         if ((cpoptarg = strchr(cpopt, '=')))
2682                                 *cpoptarg++ = '\0';
2683                         else {
2684                                 *cp = savedc;
2685                                 nextfield(&cp, &endcp);
2686                                 **endcpp = '\0';
2687                                 if (endcp > cp && *cp != '-') {
2688                                         cpoptarg = cp;
2689                                         savedc2 = *endcp;
2690                                         *endcp = '\0';
2691                                         usedarg = 0;
2692                                 }
2693                         }
2694                 }
2695                 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) {
2696                         *exflagsp |= MNT_EXRDONLY;
2697                 } else if (cpoptarg && (!strcmp(cpopt, "maproot") ||
2698                     !(allflag = strcmp(cpopt, "mapall")) ||
2699                     !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) {
2700                         usedarg++;
2701                         parsecred(cpoptarg, cr);
2702                         if (allflag == 0) {
2703                                 *exflagsp |= MNT_EXPORTANON;
2704                                 opt_flags |= OP_MAPALL;
2705                         } else
2706                                 opt_flags |= OP_MAPROOT;
2707                 } else if (cpoptarg && (!strcmp(cpopt, "mask") ||
2708                     !strcmp(cpopt, "m"))) {
2709                         if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) {
2710                                 syslog(LOG_ERR, "bad mask: %s", cpoptarg);
2711                                 return (1);
2712                         }
2713                         usedarg++;
2714                         opt_flags |= OP_MASK;
2715                 } else if (cpoptarg && (!strcmp(cpopt, "network") ||
2716                         !strcmp(cpopt, "n"))) {
2717                         if (strchr(cpoptarg, '/') != NULL) {
2718                                 if (debug)
2719                                         fprintf(stderr, "setting OP_MASKLEN\n");
2720                                 opt_flags |= OP_MASKLEN;
2721                         }
2722                         if (grp->gr_type != GT_NULL) {
2723                                 syslog(LOG_ERR, "network/host conflict");
2724                                 return (1);
2725                         } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) {
2726                                 syslog(LOG_ERR, "bad net: %s", cpoptarg);
2727                                 return (1);
2728                         }
2729                         grp->gr_type = GT_NET;
2730                         *has_hostp = 1;
2731                         usedarg++;
2732                         opt_flags |= OP_NET;
2733                 } else if (!strcmp(cpopt, "alldirs")) {
2734                         opt_flags |= OP_ALLDIRS;
2735                 } else if (!strcmp(cpopt, "public")) {
2736                         *exflagsp |= MNT_EXPUBLIC;
2737                 } else if (!strcmp(cpopt, "webnfs")) {
2738                         *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON);
2739                         opt_flags |= OP_MAPALL;
2740                 } else if (cpoptarg && !strcmp(cpopt, "index")) {
2741                         ep->ex_indexfile = strdup(cpoptarg);
2742                 } else if (!strcmp(cpopt, "quiet")) {
2743                         opt_flags |= OP_QUIET;
2744                 } else if (cpoptarg && !strcmp(cpopt, "sec")) {
2745                         if (parsesec(cpoptarg, ep))
2746                                 return (1);
2747                         opt_flags |= OP_SEC;
2748                         usedarg++;
2749                 } else {
2750                         syslog(LOG_ERR, "bad opt %s", cpopt);
2751                         return (1);
2752                 }
2753                 if (usedarg >= 0) {
2754                         *endcp = savedc2;
2755                         **endcpp = savedc;
2756                         if (usedarg > 0) {
2757                                 *cpp = cp;
2758                                 *endcpp = endcp;
2759                         }
2760                         return (0);
2761                 }
2762                 cpopt = cpoptend;
2763         }
2764         **endcpp = savedc;
2765         return (0);
2766 }
2767
2768 /*
2769  * Translate a character string to the corresponding list of network
2770  * addresses for a hostname.
2771  */
2772 static int
2773 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp)
2774 {
2775         struct grouplist *checkgrp;
2776         struct addrinfo *ai, *tai, hints;
2777         int ecode;
2778         char host[NI_MAXHOST];
2779
2780         if (grp->gr_type != GT_NULL) {
2781                 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp);
2782                 return (1);
2783         }
2784         memset(&hints, 0, sizeof hints);
2785         hints.ai_flags = AI_CANONNAME;
2786         hints.ai_protocol = IPPROTO_UDP;
2787         ecode = getaddrinfo(cp, NULL, &hints, &ai);
2788         if (ecode != 0) {
2789                 syslog(LOG_ERR,"can't get address info for host %s", cp);
2790                 return 1;
2791         }
2792         grp->gr_ptr.gt_addrinfo = ai;
2793         while (ai != NULL) {
2794                 if (ai->ai_canonname == NULL) {
2795                         if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host,
2796                             sizeof host, NULL, 0, NI_NUMERICHOST) != 0)
2797                                 strlcpy(host, "?", sizeof(host));
2798                         ai->ai_canonname = strdup(host);
2799                         ai->ai_flags |= AI_CANONNAME;
2800                 }
2801                 if (debug)
2802                         fprintf(stderr, "got host %s\n", ai->ai_canonname);
2803                 /*
2804                  * Sanity check: make sure we don't already have an entry
2805                  * for this host in the grouplist.
2806                  */
2807                 for (checkgrp = tgrp; checkgrp != NULL;
2808                     checkgrp = checkgrp->gr_next) {
2809                         if (checkgrp->gr_type != GT_HOST)
2810                                 continue;
2811                         for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL;
2812                             tai = tai->ai_next) {
2813                                 if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0)
2814                                         continue;
2815                                 if (debug)
2816                                         fprintf(stderr,
2817                                             "ignoring duplicate host %s\n",
2818                                             ai->ai_canonname);
2819                                 grp->gr_type = GT_IGNORE;
2820                                 return (0);
2821                         }
2822                 }
2823                 ai = ai->ai_next;
2824         }
2825         grp->gr_type = GT_HOST;
2826         return (0);
2827 }
2828
2829 /*
2830  * Free up an exports list component
2831  */
2832 static void
2833 free_exp(struct exportlist *ep)
2834 {
2835         struct grouplist *grp, *tgrp;
2836
2837         if (ep->ex_defdir) {
2838                 free_host(ep->ex_defdir->dp_hosts);
2839                 free((caddr_t)ep->ex_defdir);
2840         }
2841         if (ep->ex_fsdir)
2842                 free(ep->ex_fsdir);
2843         if (ep->ex_indexfile)
2844                 free(ep->ex_indexfile);
2845         free_dir(ep->ex_dirl);
2846         grp = ep->ex_grphead;
2847         while (grp) {
2848                 tgrp = grp;
2849                 grp = grp->gr_next;
2850                 free_grp(tgrp);
2851         }
2852         free((caddr_t)ep);
2853 }
2854
2855 /*
2856  * Free up the v4root exports.
2857  */
2858 static void
2859 free_v4rootexp(void)
2860 {
2861
2862         if (v4root_ep != NULL) {
2863                 free_exp(v4root_ep);
2864                 v4root_ep = NULL;
2865         }
2866 }
2867
2868 /*
2869  * Free hosts.
2870  */
2871 static void
2872 free_host(struct hostlist *hp)
2873 {
2874         struct hostlist *hp2;
2875
2876         while (hp) {
2877                 hp2 = hp;
2878                 hp = hp->ht_next;
2879                 free((caddr_t)hp2);
2880         }
2881 }
2882
2883 static struct hostlist *
2884 get_ht(void)
2885 {
2886         struct hostlist *hp;
2887
2888         hp = (struct hostlist *)malloc(sizeof (struct hostlist));
2889         if (hp == (struct hostlist *)NULL)
2890                 out_of_mem();
2891         hp->ht_next = (struct hostlist *)NULL;
2892         hp->ht_flag = 0;
2893         return (hp);
2894 }
2895
2896 /*
2897  * Out of memory, fatal
2898  */
2899 static void
2900 out_of_mem(void)
2901 {
2902
2903         syslog(LOG_ERR, "out of memory");
2904         exit(2);
2905 }
2906
2907 /*
2908  * Call do_mount() from the struct exportlist, for each case needed.
2909  */
2910 static int
2911 do_export_mount(struct exportlist *ep, struct statfs *fsp)
2912 {
2913         struct grouplist *grp, defgrp;
2914         int ret;
2915         size_t dirlen;
2916
2917         LOGDEBUG("do_export_mount=%s", ep->ex_fsdir);
2918         dirlen = strlen(ep->ex_fsdir);
2919         if ((ep->ex_flag & EX_DEFSET) != 0) {
2920                 defgrp.gr_type = GT_DEFAULT;
2921                 defgrp.gr_next = NULL;
2922                 /* We have an entry for all other hosts/nets. */
2923                 LOGDEBUG("ex_defexflags=0x%x", ep->ex_defexflags);
2924                 ret = do_mount(ep, &defgrp, ep->ex_defexflags, &ep->ex_defanon,
2925                     ep->ex_fsdir, dirlen, fsp, ep->ex_defnumsecflavors,
2926                     ep->ex_defsecflavors);
2927                 if (ret != 0)
2928                         return (ret);
2929         }
2930
2931         /* Do a mount for each group. */
2932         grp = ep->ex_grphead;
2933         while (grp != NULL) {
2934                 LOGDEBUG("do mount gr_type=0x%x gr_exflags=0x%x",
2935                     grp->gr_type, grp->gr_exflags);
2936                 ret = do_mount(ep, grp, grp->gr_exflags, &grp->gr_anon,
2937                     ep->ex_fsdir, dirlen, fsp, grp->gr_numsecflavors,
2938                     grp->gr_secflavors);
2939                 if (ret != 0)
2940                         return (ret);
2941                 grp = grp->gr_next;
2942         }
2943         return (0);
2944 }
2945
2946 /*
2947  * Do the nmount() syscall with the update flag to push the export info into
2948  * the kernel.
2949  */
2950 static int
2951 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags,
2952     struct xucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb,
2953     int numsecflavors, int *secflavors)
2954 {
2955         struct statfs fsb1;
2956         struct addrinfo *ai;
2957         struct export_args *eap;
2958         char errmsg[255];
2959         char *cp;
2960         int done;
2961         char savedc;
2962         struct iovec *iov;
2963         int i, iovlen;
2964         int ret;
2965         struct nfsex_args nfsea;
2966
2967         eap = &nfsea.export;
2968
2969         cp = NULL;
2970         savedc = '\0';
2971         iov = NULL;
2972         iovlen = 0;
2973         ret = 0;
2974
2975         bzero(eap, sizeof (struct export_args));
2976         bzero(errmsg, sizeof(errmsg));
2977         eap->ex_flags = exflags;
2978         eap->ex_anon = *anoncrp;
2979         LOGDEBUG("do_mount exflags=0x%x", exflags);
2980         eap->ex_indexfile = ep->ex_indexfile;
2981         if (grp->gr_type == GT_HOST)
2982                 ai = grp->gr_ptr.gt_addrinfo;
2983         else
2984                 ai = NULL;
2985         eap->ex_numsecflavors = numsecflavors;
2986         LOGDEBUG("do_mount numsec=%d", numsecflavors);
2987         for (i = 0; i < eap->ex_numsecflavors; i++)
2988                 eap->ex_secflavors[i] = secflavors[i];
2989         if (eap->ex_numsecflavors == 0) {
2990                 eap->ex_numsecflavors = 1;
2991                 eap->ex_secflavors[0] = AUTH_SYS;
2992         }
2993         done = FALSE;
2994
2995         if (v4root_phase == 0) {
2996                 build_iovec(&iov, &iovlen, "fstype", NULL, 0);
2997                 build_iovec(&iov, &iovlen, "fspath", NULL, 0);
2998                 build_iovec(&iov, &iovlen, "from", NULL, 0);
2999                 build_iovec(&iov, &iovlen, "update", NULL, 0);
3000                 build_iovec(&iov, &iovlen, "export", eap,
3001                     sizeof (struct export_args));
3002                 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
3003         }
3004
3005         while (!done) {
3006                 switch (grp->gr_type) {
3007                 case GT_HOST:
3008                         if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0)
3009                                 goto skip;
3010                         eap->ex_addr = ai->ai_addr;
3011                         eap->ex_addrlen = ai->ai_addrlen;
3012                         eap->ex_masklen = 0;
3013                         break;
3014                 case GT_NET:
3015                         if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 &&
3016                             have_v6 == 0)
3017                                 goto skip;
3018                         eap->ex_addr =
3019                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net;
3020                         eap->ex_addrlen =
3021                             ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_net)->sa_len;
3022                         eap->ex_mask =
3023                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask;
3024                         eap->ex_masklen = ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask)->sa_len;
3025                         break;
3026                 case GT_DEFAULT:
3027                         eap->ex_addr = NULL;
3028                         eap->ex_addrlen = 0;
3029                         eap->ex_mask = NULL;
3030                         eap->ex_masklen = 0;
3031                         break;
3032                 case GT_IGNORE:
3033                         ret = 0;
3034                         goto error_exit;
3035                         break;
3036                 default:
3037                         syslog(LOG_ERR, "bad grouptype");
3038                         if (cp)
3039                                 *cp = savedc;
3040                         ret = 1;
3041                         goto error_exit;
3042                 }
3043
3044                 /*
3045                  * For V4:, use the nfssvc() syscall, instead of mount().
3046                  */
3047                 if (v4root_phase == 2) {
3048                         nfsea.fspec = v4root_dirpath;
3049                         if (nfssvc(NFSSVC_V4ROOTEXPORT, (caddr_t)&nfsea) < 0) {
3050                                 syslog(LOG_ERR, "Exporting V4: failed");
3051                                 return (2);
3052                         }
3053                 } else {
3054                         /*
3055                          * XXX:
3056                          * Maybe I should just use the fsb->f_mntonname path
3057                          * instead of looping back up the dirp to the mount
3058                          * point??
3059                          * Also, needs to know how to export all types of local
3060                          * exportable filesystems and not just "ufs".
3061                          */
3062                         iov[1].iov_base = fsb->f_fstypename; /* "fstype" */
3063                         iov[1].iov_len = strlen(fsb->f_fstypename) + 1;
3064                         iov[3].iov_base = fsb->f_mntonname; /* "fspath" */
3065                         iov[3].iov_len = strlen(fsb->f_mntonname) + 1;
3066                         iov[5].iov_base = fsb->f_mntfromname; /* "from" */
3067                         iov[5].iov_len = strlen(fsb->f_mntfromname) + 1;
3068                         errmsg[0] = '\0';
3069
3070                         while (nmount(iov, iovlen, fsb->f_flags) < 0) {
3071                                 if (cp)
3072                                         *cp-- = savedc;
3073                                 else
3074                                         cp = dirp + dirplen - 1;
3075                                 if (opt_flags & OP_QUIET) {
3076                                         ret = 1;
3077                                         goto error_exit;
3078                                 }
3079                                 if (errno == EPERM) {
3080                                         if (debug)
3081                                                 warnx("can't change attributes for %s: %s",
3082                                                     dirp, errmsg);
3083                                         syslog(LOG_ERR,
3084                                            "can't change attributes for %s: %s",
3085                                             dirp, errmsg);
3086                                         ret = 1;
3087                                         goto error_exit;
3088                                 }
3089                                 if (opt_flags & OP_ALLDIRS) {
3090                                         if (errno == EINVAL)
3091                                                 syslog(LOG_ERR,
3092                 "-alldirs requested but %s is not a filesystem mountpoint",
3093                                                     dirp);
3094                                         else
3095                                                 syslog(LOG_ERR,
3096                                                     "could not remount %s: %m",
3097                                                     dirp);
3098                                         ret = 1;
3099                                         goto error_exit;
3100                                 }
3101                                 /* back up over the last component */
3102                                 while (*cp == '/' && cp > dirp)
3103                                         cp--;
3104                                 while (*(cp - 1) != '/' && cp > dirp)
3105                                         cp--;
3106                                 if (cp == dirp) {
3107                                         if (debug)
3108                                                 warnx("mnt unsucc");
3109                                         syslog(LOG_ERR, "can't export %s %s",
3110                                             dirp, errmsg);
3111                                         ret = 1;
3112                                         goto error_exit;
3113                                 }
3114                                 savedc = *cp;
3115                                 *cp = '\0';
3116                                 /*
3117                                  * Check that we're still on the same
3118                                  * filesystem.
3119                                  */
3120                                 if (statfs(dirp, &fsb1) != 0 ||
3121                                     fsidcmp(&fsb1.f_fsid, &fsb->f_fsid) != 0) {
3122                                         *cp = savedc;
3123                                         syslog(LOG_ERR,
3124                                             "can't export %s %s", dirp,
3125                                             errmsg);
3126                                         ret = 1;
3127                                         goto error_exit;
3128                                 }
3129                         }
3130                 }
3131
3132                 /*
3133                  * For the experimental server:
3134                  * If this is the public directory, get the file handle
3135                  * and load it into the kernel via the nfssvc() syscall.
3136                  */
3137                 if ((exflags & MNT_EXPUBLIC) != 0) {
3138                         fhandle_t fh;
3139                         char *public_name;
3140
3141                         if (eap->ex_indexfile != NULL)
3142                                 public_name = eap->ex_indexfile;
3143                         else
3144                                 public_name = dirp;
3145                         if (getfh(public_name, &fh) < 0)
3146                                 syslog(LOG_ERR,
3147                                     "Can't get public fh for %s", public_name);
3148                         else if (nfssvc(NFSSVC_PUBLICFH, (caddr_t)&fh) < 0)
3149                                 syslog(LOG_ERR,
3150                                     "Can't set public fh for %s", public_name);
3151                         else {
3152                                 has_publicfh = 1;
3153                                 has_set_publicfh = 1;
3154                                 ep->ex_flag |= EX_PUBLICFH;
3155                         }
3156                 }
3157 skip:
3158                 if (ai != NULL)
3159                         ai = ai->ai_next;
3160                 if (ai == NULL)
3161                         done = TRUE;
3162         }
3163         if (cp)
3164                 *cp = savedc;
3165 error_exit:
3166         /* free strings allocated by strdup() in getmntopts.c */
3167         if (iov != NULL) {
3168                 free(iov[0].iov_base); /* fstype */
3169                 free(iov[2].iov_base); /* fspath */
3170                 free(iov[4].iov_base); /* from */
3171                 free(iov[6].iov_base); /* update */
3172                 free(iov[8].iov_base); /* export */
3173                 free(iov[10].iov_base); /* errmsg */
3174
3175                 /* free iov, allocated by realloc() */
3176                 free(iov);
3177         }
3178         return (ret);
3179 }
3180
3181 /*
3182  * Translate a net address.
3183  *
3184  * If `maskflg' is nonzero, then `cp' is a netmask, not a network address.
3185  */
3186 static int
3187 get_net(char *cp, struct netmsk *net, int maskflg)
3188 {
3189         struct netent *np = NULL;
3190         char *name, *p, *prefp;
3191         struct sockaddr_in sin;
3192         struct sockaddr *sa = NULL;
3193         struct addrinfo hints, *ai = NULL;
3194         char netname[NI_MAXHOST];
3195         long preflen;
3196
3197         p = prefp = NULL;
3198         if ((opt_flags & OP_MASKLEN) && !maskflg) {
3199                 p = strchr(cp, '/');
3200                 *p = '\0';
3201                 prefp = p + 1;
3202         }
3203
3204         /*
3205          * Check for a numeric address first. We wish to avoid
3206          * possible DNS lookups in getnetbyname().
3207          */
3208         if (isxdigit(*cp) || *cp == ':') {
3209                 memset(&hints, 0, sizeof hints);
3210                 /* Ensure the mask and the network have the same family. */
3211                 if (maskflg && (opt_flags & OP_NET))
3212                         hints.ai_family = net->nt_net.ss_family;
3213                 else if (!maskflg && (opt_flags & OP_HAVEMASK))
3214                         hints.ai_family = net->nt_mask.ss_family;
3215                 else
3216                         hints.ai_family = AF_UNSPEC;
3217                 hints.ai_flags = AI_NUMERICHOST;
3218                 if (getaddrinfo(cp, NULL, &hints, &ai) == 0)
3219                         sa = ai->ai_addr;
3220                 if (sa != NULL && ai->ai_family == AF_INET) {
3221                         /*
3222                          * The address in `cp' is really a network address, so
3223                          * use inet_network() to re-interpret this correctly.
3224                          * e.g. "127.1" means 127.1.0.0, not 127.0.0.1.
3225                          */
3226                         bzero(&sin, sizeof sin);
3227                         sin.sin_family = AF_INET;
3228                         sin.sin_len = sizeof sin;
3229                         sin.sin_addr = inet_makeaddr(inet_network(cp), 0);
3230                         if (debug)
3231                                 fprintf(stderr, "get_net: v4 addr %s\n",
3232                                     inet_ntoa(sin.sin_addr));
3233                         sa = (struct sockaddr *)&sin;
3234                 }
3235         }
3236         if (sa == NULL && (np = getnetbyname(cp)) != NULL) {
3237                 bzero(&sin, sizeof sin);
3238                 sin.sin_family = AF_INET;
3239                 sin.sin_len = sizeof sin;
3240                 sin.sin_addr = inet_makeaddr(np->n_net, 0);
3241                 sa = (struct sockaddr *)&sin;
3242         }
3243         if (sa == NULL)
3244                 goto fail;
3245
3246         if (maskflg) {
3247                 /* The specified sockaddr is a mask. */
3248                 if (checkmask(sa) != 0)
3249                         goto fail;
3250                 bcopy(sa, &net->nt_mask, sa->sa_len);
3251                 opt_flags |= OP_HAVEMASK;
3252         } else {
3253                 /* The specified sockaddr is a network address. */
3254                 bcopy(sa, &net->nt_net, sa->sa_len);
3255
3256                 /* Get a network name for the export list. */
3257                 if (np) {
3258                         name = np->n_name;
3259                 } else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname,
3260                    NULL, 0, NI_NUMERICHOST) == 0) {
3261                         name = netname;
3262                 } else {
3263                         goto fail;
3264                 }
3265                 if ((net->nt_name = strdup(name)) == NULL)
3266                         out_of_mem();
3267
3268                 /*
3269                  * Extract a mask from either a "/<masklen>" suffix, or
3270                  * from the class of an IPv4 address.
3271                  */
3272                 if (opt_flags & OP_MASKLEN) {
3273                         preflen = strtol(prefp, NULL, 10);
3274                         if (preflen < 0L || preflen == LONG_MAX)
3275                                 goto fail;
3276                         bcopy(sa, &net->nt_mask, sa->sa_len);
3277                         if (makemask(&net->nt_mask, (int)preflen) != 0)
3278                                 goto fail;
3279                         opt_flags |= OP_HAVEMASK;
3280                         *p = '/';
3281                 } else if (sa->sa_family == AF_INET &&
3282                     (opt_flags & OP_MASK) == 0) {
3283                         in_addr_t addr;
3284
3285                         addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
3286                         if (IN_CLASSA(addr))
3287                                 preflen = 8;
3288                         else if (IN_CLASSB(addr))
3289                                 preflen = 16;
3290                         else if (IN_CLASSC(addr))
3291                                 preflen = 24;
3292                         else if (IN_CLASSD(addr))
3293                                 preflen = 28;
3294                         else
3295                                 preflen = 32;   /* XXX */
3296
3297                         bcopy(sa, &net->nt_mask, sa->sa_len);
3298                         makemask(&net->nt_mask, (int)preflen);
3299                         opt_flags |= OP_HAVEMASK;
3300                 }
3301         }
3302
3303         if (ai)
3304                 freeaddrinfo(ai);
3305         return 0;
3306
3307 fail:
3308         if (ai)
3309                 freeaddrinfo(ai);
3310         return 1;
3311 }
3312
3313 /*
3314  * Parse out the next white space separated field
3315  */
3316 static void
3317 nextfield(char **cp, char **endcp)
3318 {
3319         char *p;
3320         char quot = 0;
3321
3322         p = *cp;
3323         while (*p == ' ' || *p == '\t')
3324                 p++;
3325         *cp = p;
3326         while (*p != '\0') {
3327                 if (quot) {
3328                         if (*p == quot)
3329                                 quot = 0;
3330                 } else {
3331                         if (*p == '\\' && *(p + 1) != '\0')
3332                                 p++;
3333                         else if (*p == '\'' || *p == '"')
3334                                 quot = *p;
3335                         else if (*p == ' ' || *p == '\t')
3336                                 break;
3337                 }
3338                 p++;
3339         };
3340         *endcp = p;
3341 }
3342
3343 /*
3344  * Get an exports file line. Skip over blank lines and handle line
3345  * continuations.
3346  */
3347 static int
3348 get_line(void)
3349 {
3350         char *p, *cp;
3351         size_t len;
3352         int totlen, cont_line;
3353
3354         /*
3355          * Loop around ignoring blank lines and getting all continuation lines.
3356          */
3357         p = line;
3358         totlen = 0;
3359         do {
3360                 if ((p = fgetln(exp_file, &len)) == NULL)
3361                         return (0);
3362                 cp = p + len - 1;
3363                 cont_line = 0;
3364                 while (cp >= p &&
3365                     (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) {
3366                         if (*cp == '\\')
3367                                 cont_line = 1;
3368                         cp--;
3369                         len--;
3370                 }
3371                 if (cont_line) {
3372                         *++cp = ' ';
3373                         len++;
3374                 }
3375                 if (linesize < len + totlen + 1) {
3376                         linesize = len + totlen + 1;
3377                         line = realloc(line, linesize);
3378                         if (line == NULL)
3379                                 out_of_mem();
3380                 }
3381                 memcpy(line + totlen, p, len);
3382                 totlen += len;
3383                 line[totlen] = '\0';
3384         } while (totlen == 0 || cont_line);
3385         return (1);
3386 }
3387
3388 /*
3389  * Parse a description of a credential.
3390  */
3391 static void
3392 parsecred(char *namelist, struct xucred *cr)
3393 {
3394         char *name;
3395         int cnt;
3396         char *names;
3397         struct passwd *pw;
3398         struct group *gr;
3399         gid_t groups[XU_NGROUPS + 1];
3400         int ngroups;
3401
3402         cr->cr_version = XUCRED_VERSION;
3403         /*
3404          * Set up the unprivileged user.
3405          */
3406         cr->cr_uid = 65534;
3407         cr->cr_groups[0] = 65533;
3408         cr->cr_ngroups = 1;
3409         /*
3410          * Get the user's password table entry.
3411          */
3412         names = namelist;
3413         name = strsep_quote(&names, ":");
3414         /* Bug?  name could be NULL here */
3415         if (isdigit(*name) || *name == '-')
3416                 pw = getpwuid(atoi(name));
3417         else
3418                 pw = getpwnam(name);
3419         /*
3420          * Credentials specified as those of a user.
3421          */
3422         if (names == NULL) {
3423                 if (pw == NULL) {
3424                         syslog(LOG_ERR, "unknown user: %s", name);
3425                         return;
3426                 }
3427                 cr->cr_uid = pw->pw_uid;
3428                 ngroups = XU_NGROUPS + 1;
3429                 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups)) {
3430                         syslog(LOG_ERR, "too many groups");
3431                         ngroups = XU_NGROUPS + 1;
3432                 }
3433
3434                 /*
3435                  * Compress out duplicate.
3436                  */
3437                 cr->cr_ngroups = ngroups - 1;
3438                 cr->cr_groups[0] = groups[0];
3439                 for (cnt = 2; cnt < ngroups; cnt++)
3440                         cr->cr_groups[cnt - 1] = groups[cnt];
3441                 return;
3442         }
3443         /*
3444          * Explicit credential specified as a colon separated list:
3445          *      uid:gid:gid:...
3446          */
3447         if (pw != NULL)
3448                 cr->cr_uid = pw->pw_uid;
3449         else if (isdigit(*name) || *name == '-')
3450                 cr->cr_uid = atoi(name);
3451         else {
3452                 syslog(LOG_ERR, "unknown user: %s", name);
3453                 return;
3454         }
3455         cr->cr_ngroups = 0;
3456         while (names != NULL && *names != '\0' && cr->cr_ngroups < XU_NGROUPS) {
3457                 name = strsep_quote(&names, ":");
3458                 if (isdigit(*name) || *name == '-') {
3459                         cr->cr_groups[cr->cr_ngroups++] = atoi(name);
3460                 } else {
3461                         if ((gr = getgrnam(name)) == NULL) {
3462                                 syslog(LOG_ERR, "unknown group: %s", name);
3463                                 continue;
3464                         }
3465                         cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid;
3466                 }
3467         }
3468         if (names != NULL && *names != '\0' && cr->cr_ngroups == XU_NGROUPS)
3469                 syslog(LOG_ERR, "too many groups");
3470 }
3471
3472 #define STRSIZ  (MNTNAMLEN+MNTPATHLEN+50)
3473 /*
3474  * Routines that maintain the remote mounttab
3475  */
3476 static void
3477 get_mountlist(void)
3478 {
3479         struct mountlist *mlp;
3480         char *host, *dirp, *cp;
3481         char str[STRSIZ];
3482         FILE *mlfile;
3483
3484         if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) {
3485                 if (errno == ENOENT)
3486                         return;
3487                 else {
3488                         syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST);
3489                         return;
3490                 }
3491         }
3492         while (fgets(str, STRSIZ, mlfile) != NULL) {
3493                 cp = str;
3494                 host = strsep(&cp, " \t\n");
3495                 dirp = strsep(&cp, " \t\n");
3496                 if (host == NULL || dirp == NULL)
3497                         continue;
3498                 mlp = (struct mountlist *)malloc(sizeof (*mlp));
3499                 if (mlp == (struct mountlist *)NULL)
3500                         out_of_mem();
3501                 strncpy(mlp->ml_host, host, MNTNAMLEN);
3502                 mlp->ml_host[MNTNAMLEN] = '\0';
3503                 strncpy(mlp->ml_dirp, dirp, MNTPATHLEN);
3504                 mlp->ml_dirp[MNTPATHLEN] = '\0';
3505
3506                 SLIST_INSERT_HEAD(&mlhead, mlp, next);
3507         }
3508         fclose(mlfile);
3509 }
3510
3511 static void
3512 del_mlist(char *hostp, char *dirp)
3513 {
3514         struct mountlist *mlp, *mlp2;
3515         FILE *mlfile;
3516         int fnd = 0;
3517
3518         SLIST_FOREACH_SAFE(mlp, &mlhead, next, mlp2) {
3519                 if (!strcmp(mlp->ml_host, hostp) &&
3520                     (!dirp || !strcmp(mlp->ml_dirp, dirp))) {
3521                         fnd = 1;
3522                         SLIST_REMOVE(&mlhead, mlp, mountlist, next);
3523                         free((caddr_t)mlp);
3524                 }
3525         }
3526         if (fnd) {
3527                 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) {
3528                         syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST);
3529                         return;
3530                 }
3531                 SLIST_FOREACH(mlp, &mlhead, next) {
3532                         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
3533                 }
3534                 fclose(mlfile);
3535         }
3536 }
3537
3538 static void
3539 add_mlist(char *hostp, char *dirp)
3540 {
3541         struct mountlist *mlp;
3542         FILE *mlfile;
3543
3544         SLIST_FOREACH(mlp, &mlhead, next) {
3545                 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp))
3546                         return;
3547         }
3548
3549         mlp = (struct mountlist *)malloc(sizeof (*mlp));
3550         if (mlp == (struct mountlist *)NULL)
3551                 out_of_mem();
3552         strncpy(mlp->ml_host, hostp, MNTNAMLEN);
3553         mlp->ml_host[MNTNAMLEN] = '\0';
3554         strncpy(mlp->ml_dirp, dirp, MNTPATHLEN);
3555         mlp->ml_dirp[MNTPATHLEN] = '\0';
3556         SLIST_INSERT_HEAD(&mlhead, mlp, next);
3557         if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
3558                 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST);
3559                 return;
3560         }
3561         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
3562         fclose(mlfile);
3563 }
3564
3565 /*
3566  * Free up a group list.
3567  */
3568 static void
3569 free_grp(struct grouplist *grp)
3570 {
3571         if (grp->gr_type == GT_HOST) {
3572                 if (grp->gr_ptr.gt_addrinfo != NULL)
3573                         freeaddrinfo(grp->gr_ptr.gt_addrinfo);
3574         } else if (grp->gr_type == GT_NET) {
3575                 if (grp->gr_ptr.gt_net.nt_name)
3576                         free(grp->gr_ptr.gt_net.nt_name);
3577         }
3578         free((caddr_t)grp);
3579 }
3580
3581 #ifdef DEBUG
3582 static void
3583 SYSLOG(int pri, const char *fmt, ...)
3584 {
3585         va_list ap;
3586
3587         va_start(ap, fmt);
3588         vfprintf(stderr, fmt, ap);
3589         va_end(ap);
3590 }
3591 #endif /* DEBUG */
3592
3593 /*
3594  * Check options for consistency.
3595  */
3596 static int
3597 check_options(struct dirlist *dp)
3598 {
3599
3600         if (v4root_phase == 0 && dp == NULL)
3601             return (1);
3602         if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL)) {
3603             syslog(LOG_ERR, "-mapall and -maproot mutually exclusive");
3604             return (1);
3605         }
3606         if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) {
3607                 syslog(LOG_ERR, "-mask requires -network");
3608                 return (1);
3609         }
3610         if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) {
3611                 syslog(LOG_ERR, "-network requires mask specification");
3612                 return (1);
3613         }
3614         if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) {
3615                 syslog(LOG_ERR, "-mask and /masklen are mutually exclusive");
3616                 return (1);
3617         }
3618         if (v4root_phase > 0 &&
3619             (opt_flags &
3620              ~(OP_SEC | OP_MASK | OP_NET | OP_HAVEMASK | OP_MASKLEN)) != 0) {
3621             syslog(LOG_ERR,"only -sec,-net,-mask options allowed on V4:");
3622             return (1);
3623         }
3624         if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
3625             syslog(LOG_ERR, "-alldirs has multiple directories");
3626             return (1);
3627         }
3628         return (0);
3629 }
3630
3631 /*
3632  * Check an absolute directory path for any symbolic links. Return true
3633  */
3634 static int
3635 check_dirpath(char *dirp)
3636 {
3637         char *cp;
3638         int ret = 1;
3639         struct stat sb;
3640
3641         cp = dirp + 1;
3642         while (*cp && ret) {
3643                 if (*cp == '/') {
3644                         *cp = '\0';
3645                         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
3646                                 ret = 0;
3647                         *cp = '/';
3648                 }
3649                 cp++;
3650         }
3651         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
3652                 ret = 0;
3653         return (ret);
3654 }
3655
3656 /*
3657  * Make a netmask according to the specified prefix length. The ss_family
3658  * and other non-address fields must be initialised before calling this.
3659  */
3660 static int
3661 makemask(struct sockaddr_storage *ssp, int bitlen)
3662 {
3663         u_char *p;
3664         int bits, i, len;
3665
3666         if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL)
3667                 return (-1);
3668         if (bitlen > len * CHAR_BIT)
3669                 return (-1);
3670
3671         for (i = 0; i < len; i++) {
3672                 bits = MIN(CHAR_BIT, bitlen);
3673                 *p++ = (u_char)~0 << (CHAR_BIT - bits);
3674                 bitlen -= bits;
3675         }
3676         return 0;
3677 }
3678
3679 /*
3680  * Check that the sockaddr is a valid netmask. Returns 0 if the mask
3681  * is acceptable (i.e. of the form 1...10....0).
3682  */
3683 static int
3684 checkmask(struct sockaddr *sa)
3685 {
3686         u_char *mask;
3687         int i, len;
3688
3689         if ((mask = sa_rawaddr(sa, &len)) == NULL)
3690                 return (-1);
3691
3692         for (i = 0; i < len; i++)
3693                 if (mask[i] != 0xff)
3694                         break;
3695         if (i < len) {
3696                 if (~mask[i] & (u_char)(~mask[i] + 1))
3697                         return (-1);
3698                 i++;
3699         }
3700         for (; i < len; i++)
3701                 if (mask[i] != 0)
3702                         return (-1);
3703         return (0);
3704 }
3705
3706 /*
3707  * Compare two sockaddrs according to a specified mask. Return zero if
3708  * `sa1' matches `sa2' when filtered by the netmask in `samask'.
3709  * If samask is NULL, perform a full comparison.
3710  */
3711 static int
3712 sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask)
3713 {
3714         unsigned char *p1, *p2, *mask;
3715         int len, i;
3716
3717         if (sa1->sa_family != sa2->sa_family ||
3718             (p1 = sa_rawaddr(sa1, &len)) == NULL ||
3719             (p2 = sa_rawaddr(sa2, NULL)) == NULL)
3720                 return (1);
3721
3722         switch (sa1->sa_family) {
3723         case AF_INET6:
3724                 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
3725                     ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
3726                         return (1);
3727                 break;
3728         }
3729
3730         /* Simple binary comparison if no mask specified. */
3731         if (samask == NULL)
3732                 return (memcmp(p1, p2, len));
3733
3734         /* Set up the mask, and do a mask-based comparison. */
3735         if (sa1->sa_family != samask->sa_family ||
3736             (mask = sa_rawaddr(samask, NULL)) == NULL)
3737                 return (1);
3738
3739         for (i = 0; i < len; i++)
3740                 if ((p1[i] & mask[i]) != (p2[i] & mask[i]))
3741                         return (1);
3742         return (0);
3743 }
3744
3745 /*
3746  * Return a pointer to the part of the sockaddr that contains the
3747  * raw address, and set *nbytes to its length in bytes. Returns
3748  * NULL if the address family is unknown.
3749  */
3750 static void *
3751 sa_rawaddr(struct sockaddr *sa, int *nbytes) {
3752         void *p;
3753         int len;
3754
3755         switch (sa->sa_family) {
3756         case AF_INET:
3757                 len = sizeof(((struct sockaddr_in *)sa)->sin_addr);
3758                 p = &((struct sockaddr_in *)sa)->sin_addr;
3759                 break;
3760         case AF_INET6:
3761                 len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr);
3762                 p = &((struct sockaddr_in6 *)sa)->sin6_addr;
3763                 break;
3764         default:
3765                 p = NULL;
3766                 len = 0;
3767         }
3768
3769         if (nbytes != NULL)
3770                 *nbytes = len;
3771         return (p);
3772 }
3773
3774 static void
3775 huphandler(int sig __unused)
3776 {
3777
3778         got_sighup = 1;
3779 }
3780
3781 static void
3782 terminate(int sig __unused)
3783 {
3784         pidfile_remove(pfh);
3785         rpcb_unset(MOUNTPROG, MOUNTVERS, NULL);
3786         rpcb_unset(MOUNTPROG, MOUNTVERS3, NULL);
3787         exit (0);
3788 }