usr.sbin/mountd/mountd.c

   1 /*
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Herb Hasler and Rick Macklem at The University of Guelph.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 4. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #ifndef lint
  34 static const char copyright[] =
  35 "@(#) Copyright (c) 1989, 1993\n\
  36         The Regents of the University of California.  All rights reserved.\n";
  37 #endif /*not lint*/
  38
  39 #if 0
  40 #ifndef lint
  41 static char sccsid[] = "@(#)mountd.c    8.15 (Berkeley) 5/1/95";
  42 #endif /*not lint*/
  43 #endif
  44
  45 #include <sys/cdefs.h>
  46 __FBSDID("$FreeBSD$");
  47
  48 #include <sys/param.h>
  49 #include <sys/fcntl.h>
  50 #include <sys/linker.h>
  51 #include <sys/module.h>
  52 #include <sys/mount.h>
  53 #include <sys/stat.h>
  54 #include <sys/sysctl.h>
  55 #include <sys/syslog.h>
  56
  57 #include <rpc/rpc.h>
  58 #include <rpc/rpc_com.h>
  59 #include <rpc/pmap_clnt.h>
  60 #include <rpc/pmap_prot.h>
  61 #include <rpcsvc/mount.h>
  62 #include <nfs/nfsproto.h>
  63 #include <nfs/nfssvc.h>
  64 #include <nfsserver/nfs.h>
  65
  66 #include <fs/nfs/nfsport.h>
  67
  68 #include <arpa/inet.h>
  69
  70 #include <ctype.h>
  71 #include <err.h>
  72 #include <errno.h>
  73 #include <grp.h>
  74 #include <libutil.h>
  75 #include <limits.h>
  76 #include <netdb.h>
  77 #include <pwd.h>
  78 #include <signal.h>
  79 #include <stdio.h>
  80 #include <stdlib.h>
  81 #include <string.h>
  82 #include <unistd.h>
  83 #include "pathnames.h"
  84 #include "mntopts.h"
  85
  86 #ifdef DEBUG
  87 #include <stdarg.h>
  88 #endif
  89
  90 /*
  91  * Structures for keeping the mount list and export list
  92  */
  93 struct mountlist {
  94         struct mountlist *ml_next;
  95         char    ml_host[MNTNAMLEN+1];
  96         char    ml_dirp[MNTPATHLEN+1];
  97 };
  98
  99 struct dirlist {
 100         struct dirlist  *dp_left;
 101         struct dirlist  *dp_right;
 102         int             dp_flag;
 103         struct hostlist *dp_hosts;      /* List of hosts this dir exported to */
 104         char            dp_dirp[1];     /* Actually malloc'd to size of dir */
 105 };
 106 /* dp_flag bits */
 107 #define DP_DEFSET       0x1
 108 #define DP_HOSTSET      0x2
 109
 110 struct exportlist {
 111         struct exportlist *ex_next;
 112         struct dirlist  *ex_dirl;
 113         struct dirlist  *ex_defdir;
 114         int             ex_flag;
 115         fsid_t          ex_fs;
 116         char            *ex_fsdir;
 117         char            *ex_indexfile;
 118         int             ex_numsecflavors;
 119         int             ex_secflavors[MAXSECFLAVORS];
 120         int             ex_defnumsecflavors;
 121         int             ex_defsecflavors[MAXSECFLAVORS];
 122 };
 123 /* ex_flag bits */
 124 #define EX_LINKED       0x1
 125
 126 struct netmsk {
 127         struct sockaddr_storage nt_net;
 128         struct sockaddr_storage nt_mask;
 129         char            *nt_name;
 130 };
 131
 132 union grouptypes {
 133         struct addrinfo *gt_addrinfo;
 134         struct netmsk   gt_net;
 135 };
 136
 137 struct grouplist {
 138         int gr_type;
 139         union grouptypes gr_ptr;
 140         struct grouplist *gr_next;
 141         int gr_numsecflavors;
 142         int gr_secflavors[MAXSECFLAVORS];
 143 };
 144 /* Group types */
 145 #define GT_NULL         0x0
 146 #define GT_HOST         0x1
 147 #define GT_NET          0x2
 148 #define GT_DEFAULT      0x3
 149 #define GT_IGNORE       0x5
 150
 151 struct hostlist {
 152         int              ht_flag;       /* Uses DP_xx bits */
 153         struct grouplist *ht_grp;
 154         struct hostlist  *ht_next;
 155 };
 156
 157 struct fhreturn {
 158         int     fhr_flag;
 159         int     fhr_vers;
 160         nfsfh_t fhr_fh;
 161         int     fhr_numsecflavors;
 162         int     *fhr_secflavors;
 163 };
 164
 165 #define GETPORT_MAXTRY  20      /* Max tries to get a port # */
 166
 167 /* Global defs */
 168 char    *add_expdir(struct dirlist **, char *, int);
 169 void    add_dlist(struct dirlist **, struct dirlist *,
 170                                 struct grouplist *, int, struct exportlist *);
 171 void    add_mlist(char *, char *);
 172 int     check_dirpath(char *);
 173 int     check_options(struct dirlist *);
 174 int     checkmask(struct sockaddr *sa);
 175 int     chk_host(struct dirlist *, struct sockaddr *, int *, int *, int *,
 176                                  int **);
 177 static char     *strsep_quote(char **stringp, const char *delim);
 178 static int      create_service(struct netconfig *nconf);
 179 static void     complete_service(struct netconfig *nconf, char *port_str);
 180 static void     clearout_service(void);
 181 void    del_mlist(char *hostp, char *dirp);
 182 struct dirlist *dirp_search(struct dirlist *, char *);
 183 int     do_mount(struct exportlist *, struct grouplist *, int,
 184                 struct xucred *, char *, int, struct statfs *);
 185 int     do_opt(char **, char **, struct exportlist *, struct grouplist *,
 186                                 int *, int *, struct xucred *);
 187 struct  exportlist *ex_search(fsid_t *);
 188 struct  exportlist *get_exp(void);
 189 void    free_dir(struct dirlist *);
 190 void    free_exp(struct exportlist *);
 191 void    free_grp(struct grouplist *);
 192 void    free_host(struct hostlist *);
 193 void    get_exportlist(void);
 194 int     get_host(char *, struct grouplist *, struct grouplist *);
 195 struct hostlist *get_ht(void);
 196 int     get_line(void);
 197 void    get_mountlist(void);
 198 int     get_net(char *, struct netmsk *, int);
 199 void    getexp_err(struct exportlist *, struct grouplist *);
 200 struct grouplist *get_grp(void);
 201 void    hang_dirp(struct dirlist *, struct grouplist *,
 202                                 struct exportlist *, int);
 203 void    huphandler(int sig);
 204 int     makemask(struct sockaddr_storage *ssp, int bitlen);
 205 void    mntsrv(struct svc_req *, SVCXPRT *);
 206 void    nextfield(char **, char **);
 207 void    out_of_mem(void);
 208 void    parsecred(char *, struct xucred *);
 209 int     parsesec(char *, struct exportlist *);
 210 int     put_exlist(struct dirlist *, XDR *, struct dirlist *, int *, int);
 211 void    *sa_rawaddr(struct sockaddr *sa, int *nbytes);
 212 int     sacmp(struct sockaddr *sa1, struct sockaddr *sa2,
 213     struct sockaddr *samask);
 214 int     scan_tree(struct dirlist *, struct sockaddr *);
 215 static void usage(void);
 216 int     xdr_dir(XDR *, char *);
 217 int     xdr_explist(XDR *, caddr_t);
 218 int     xdr_explist_brief(XDR *, caddr_t);
 219 int     xdr_explist_common(XDR *, caddr_t, int);
 220 int     xdr_fhs(XDR *, caddr_t);
 221 int     xdr_mlist(XDR *, caddr_t);
 222 void    terminate(int);
 223
 224 struct exportlist *exphead;
 225 struct mountlist *mlhead;
 226 struct grouplist *grphead;
 227 char *exnames_default[2] = { _PATH_EXPORTS, NULL };
 228 char **exnames;
 229 char **hosts = NULL;
 230 struct xucred def_anon = {
 231         XUCRED_VERSION,
 232         (uid_t)-2,
 233         1,
 234         { (gid_t)-2 },
 235         NULL
 236 };
 237 int force_v2 = 0;
 238 int resvport_only = 1;
 239 int nhosts = 0;
 240 int dir_only = 1;
 241 int dolog = 0;
 242 int got_sighup = 0;
 243 int xcreated = 0;
 244
 245 char *svcport_str = NULL;
 246 static int      mallocd_svcport = 0;
 247 static int      *sock_fd;
 248 static int      sock_fdcnt;
 249 static int      sock_fdpos;
 250 static int      suspend_nfsd = 0;
 251
 252 int opt_flags;
 253 static int have_v6 = 1;
 254
 255 int v4root_phase = 0;
 256 char v4root_dirpath[PATH_MAX + 1];
 257 int run_v4server = 1;
 258 int has_publicfh = 0;
 259
 260 struct pidfh *pfh = NULL;
 261 /* Bits for opt_flags above */
 262 #define OP_MAPROOT      0x01
 263 #define OP_MAPALL       0x02
 264 /* 0x4 free */
 265 #define OP_MASK         0x08
 266 #define OP_NET          0x10
 267 #define OP_ALLDIRS      0x40
 268 #define OP_HAVEMASK     0x80    /* A mask was specified or inferred. */
 269 #define OP_QUIET        0x100
 270 #define OP_MASKLEN      0x200
 271 #define OP_SEC          0x400
 272
 273 #ifdef DEBUG
 274 int debug = 1;
 275 void    SYSLOG(int, const char *, ...) __printflike(2, 3);
 276 #define syslog SYSLOG
 277 #else
 278 int debug = 0;
 279 #endif
 280
 281 /*
 282  * Similar to strsep(), but it allows for quoted strings
 283  * and escaped characters.
 284  *
 285  * It returns the string (or NULL, if *stringp is NULL),
 286  * which is a de-quoted version of the string if necessary.
 287  *
 288  * It modifies *stringp in place.
 289  */
 290 static char *
 291 strsep_quote(char **stringp, const char *delim)
 292 {
 293         char *srcptr, *dstptr, *retval;
 294         char quot = 0;
 295
 296         if (stringp == NULL || *stringp == NULL)
 297                 return (NULL);
 298
 299         srcptr = dstptr = retval = *stringp;
 300
 301         while (*srcptr) {
 302                 /*
 303                  * We're looking for several edge cases here.
 304                  * First:  if we're in quote state (quot != 0),
 305                  * then we ignore the delim characters, but otherwise
 306                  * process as normal, unless it is the quote character.
 307                  * Second:  if the current character is a backslash,
 308                  * we take the next character as-is, without checking
 309                  * for delim, quote, or backslash.  Exception:  if the
 310                  * next character is a NUL, that's the end of the string.
 311                  * Third:  if the character is a quote character, we toggle
 312                  * quote state.
 313                  * Otherwise:  check the current character for NUL, or
 314                  * being in delim, and end the string if either is true.
 315                  */
 316                 if (*srcptr == '\\') {
 317                         srcptr++;
 318                         /*
 319                          * The edge case here is if the next character
 320                          * is NUL, we want to stop processing.  But if
 321                          * it's not NUL, then we simply want to copy it.
 322                          */
 323                         if (*srcptr) {
 324                                 *dstptr++ = *srcptr++;
 325                         }
 326                         continue;
 327                 }
 328                 if (quot == 0 && (*srcptr == '\'' || *srcptr == '"')) {
 329                         quot = *srcptr++;
 330                         continue;
 331                 }
 332                 if (quot && *srcptr == quot) {
 333                         /* End of the quoted part */
 334                         quot = 0;
 335                         srcptr++;
 336                         continue;
 337                 }
 338                 if (!quot && strchr(delim, *srcptr))
 339                         break;
 340                 *dstptr++ = *srcptr++;
 341         }
 342
 343         *dstptr = 0; /* Terminate the string */
 344         *stringp = (*srcptr == '\0') ? NULL : srcptr + 1;
 345         return (retval);
 346 }
 347
 348 /*
 349  * Mountd server for NFS mount protocol as described in:
 350  * NFS: Network File System Protocol Specification, RFC1094, Appendix A
 351  * The optional arguments are the exports file name
 352  * default: _PATH_EXPORTS
 353  * and "-n" to allow nonroot mount.
 354  */
 355 int
 356 main(int argc, char **argv)
 357 {
 358         fd_set readfds;
 359         struct netconfig *nconf;
 360         char *endptr, **hosts_bak;
 361         void *nc_handle;
 362         pid_t otherpid;
 363         in_port_t svcport;
 364         int c, k, s;
 365         int maxrec = RPC_MAXDATASIZE;
 366         int attempt_cnt, port_len, port_pos, ret;
 367         char **port_list;
 368
 369         /* Check that another mountd isn't already running. */
 370         pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &otherpid);
 371         if (pfh == NULL) {
 372                 if (errno == EEXIST)
 373                         errx(1, "mountd already running, pid: %d.", otherpid);
 374                 warn("cannot open or create pidfile");
 375         }
 376
 377         s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
 378         if (s < 0)
 379                 have_v6 = 0;
 380         else
 381                 close(s);
 382
 383         while ((c = getopt(argc, argv, "2deh:lnop:rS")) != -1)
 384                 switch (c) {
 385                 case '2':
 386                         force_v2 = 1;
 387                         break;
 388                 case 'e':
 389                         /* now a no-op, since this is the default */
 390                         break;
 391                 case 'n':
 392                         resvport_only = 0;
 393                         break;
 394                 case 'r':
 395                         dir_only = 0;
 396                         break;
 397                 case 'd':
 398                         debug = debug ? 0 : 1;
 399                         break;
 400                 case 'l':
 401                         dolog = 1;
 402                         break;
 403                 case 'o':
 404                         run_v4server = 0;
 405                         break;
 406                 case 'p':
 407                         endptr = NULL;
 408                         svcport = (in_port_t)strtoul(optarg, &endptr, 10);
 409                         if (endptr == NULL || *endptr != '\0' ||
 410                             svcport == 0 || svcport >= IPPORT_MAX)
 411                                 usage();
 412                         svcport_str = strdup(optarg);
 413                         break;
 414                 case 'h':
 415                         ++nhosts;
 416                         hosts_bak = hosts;
 417                         hosts_bak = realloc(hosts, nhosts * sizeof(char *));
 418                         if (hosts_bak == NULL) {
 419                                 if (hosts != NULL) {
 420                                         for (k = 0; k < nhosts; k++)
 421                                                 free(hosts[k]);
 422                                         free(hosts);
 423                                         out_of_mem();
 424                                 }
 425                         }
 426                         hosts = hosts_bak;
 427                         hosts[nhosts - 1] = strdup(optarg);
 428                         if (hosts[nhosts - 1] == NULL) {
 429                                 for (k = 0; k < (nhosts - 1); k++)
 430                                         free(hosts[k]);
 431                                 free(hosts);
 432                                 out_of_mem();
 433                         }
 434                         break;
 435                 case 'S':
 436                         suspend_nfsd = 1;
 437                         break;
 438                 default:
 439                         usage();
 440                 };
 441
 442         /*
 443          * Unless the "-o" option was specified, try and run "nfsd".
 444          * If "-o" was specified, try and run "nfsserver".
 445          */
 446         if (run_v4server > 0) {
 447                 if (modfind("nfsd") < 0) {
 448                         /* Not present in kernel, try loading it */
 449                         if (kldload("nfsd") < 0 || modfind("nfsd") < 0)
 450                                 errx(1, "NFS server is not available");
 451                 }
 452         } else if (modfind("nfsserver") < 0) {
 453                 /* Not present in kernel, try loading it */
 454                 if (kldload("nfsserver") < 0 || modfind("nfsserver") < 0)
 455                         errx(1, "NFS server is not available");
 456         }
 457
 458         argc -= optind;
 459         argv += optind;
 460         grphead = (struct grouplist *)NULL;
 461         exphead = (struct exportlist *)NULL;
 462         mlhead = (struct mountlist *)NULL;
 463         if (argc > 0)
 464                 exnames = argv;
 465         else
 466                 exnames = exnames_default;
 467         openlog("mountd", LOG_PID, LOG_DAEMON);
 468         if (debug)
 469                 warnx("getting export list");
 470         get_exportlist();
 471         if (debug)
 472                 warnx("getting mount list");
 473         get_mountlist();
 474         if (debug)
 475                 warnx("here we go");
 476         if (debug == 0) {
 477                 daemon(0, 0);
 478                 signal(SIGINT, SIG_IGN);
 479                 signal(SIGQUIT, SIG_IGN);
 480         }
 481         signal(SIGHUP, huphandler);
 482         signal(SIGTERM, terminate);
 483         signal(SIGPIPE, SIG_IGN);
 484
 485         pidfile_write(pfh);
 486
 487         rpcb_unset(MOUNTPROG, MOUNTVERS, NULL);
 488         rpcb_unset(MOUNTPROG, MOUNTVERS3, NULL);
 489         rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);
 490
 491         if (!resvport_only) {
 492                 if (sysctlbyname("vfs.nfsrv.nfs_privport", NULL, NULL,
 493                     &resvport_only, sizeof(resvport_only)) != 0 &&
 494                     errno != ENOENT) {
 495                         syslog(LOG_ERR, "sysctl: %m");
 496                         exit(1);
 497                 }
 498         }
 499
 500         /*
 501          * If no hosts were specified, add a wildcard entry to bind to
 502          * INADDR_ANY. Otherwise make sure 127.0.0.1 and ::1 are added to the
 503          * list.
 504          */
 505         if (nhosts == 0) {
 506                 hosts = malloc(sizeof(char**));
 507                 if (hosts == NULL)
 508                         out_of_mem();
 509                 hosts[0] = "*";
 510                 nhosts = 1;
 511         } else {
 512                 hosts_bak = hosts;
 513                 if (have_v6) {
 514                         hosts_bak = realloc(hosts, (nhosts + 2) *
 515                             sizeof(char *));
 516                         if (hosts_bak == NULL) {
 517                                 for (k = 0; k < nhosts; k++)
 518                                         free(hosts[k]);
 519                                 free(hosts);
 520                                 out_of_mem();
 521                         } else
 522                                 hosts = hosts_bak;
 523                         nhosts += 2;
 524                         hosts[nhosts - 2] = "::1";
 525                 } else {
 526                         hosts_bak = realloc(hosts, (nhosts + 1) * sizeof(char *));
 527                         if (hosts_bak == NULL) {
 528                                 for (k = 0; k < nhosts; k++)
 529                                         free(hosts[k]);
 530                                 free(hosts);
 531                                 out_of_mem();
 532                         } else {
 533                                 nhosts += 1;
 534                                 hosts = hosts_bak;
 535                         }
 536                 }
 537
 538                 hosts[nhosts - 1] = "127.0.0.1";
 539         }
 540
 541         attempt_cnt = 1;
 542         sock_fdcnt = 0;
 543         sock_fd = NULL;
 544         port_list = NULL;
 545         port_len = 0;
 546         nc_handle = setnetconfig();
 547         while ((nconf = getnetconfig(nc_handle))) {
 548                 if (nconf->nc_flag & NC_VISIBLE) {
 549                         if (have_v6 == 0 && strcmp(nconf->nc_protofmly,
 550                             "inet6") == 0) {
 551                                 /* DO NOTHING */
 552                         } else {
 553                                 ret = create_service(nconf);
 554                                 if (ret == 1)
 555                                         /* Ignore this call */
 556                                         continue;
 557                                 if (ret < 0) {
 558                                         /*
 559                                          * Failed to bind port, so close off
 560                                          * all sockets created and try again
 561                                          * if the port# was dynamically
 562                                          * assigned via bind(2).
 563                                          */
 564                                         clearout_service();
 565                                         if (mallocd_svcport != 0 &&
 566                                             attempt_cnt < GETPORT_MAXTRY) {
 567                                                 free(svcport_str);
 568                                                 svcport_str = NULL;
 569                                                 mallocd_svcport = 0;
 570                                         } else {
 571                                                 errno = EADDRINUSE;
 572                                                 syslog(LOG_ERR,
 573                                                     "bindresvport_sa: %m");
 574                                                 exit(1);
 575                                         }
 576
 577                                         /* Start over at the first service. */
 578                                         free(sock_fd);
 579                                         sock_fdcnt = 0;
 580                                         sock_fd = NULL;
 581                                         nc_handle = setnetconfig();
 582                                         attempt_cnt++;
 583                                 } else if (mallocd_svcport != 0 &&
 584                                     attempt_cnt == GETPORT_MAXTRY) {
 585                                         /*
 586                                          * For the last attempt, allow
 587                                          * different port #s for each nconf
 588                                          * by saving the svcport_str and
 589                                          * setting it back to NULL.
 590                                          */
 591                                         port_list = realloc(port_list,
 592                                             (port_len + 1) * sizeof(char *));
 593                                         if (port_list == NULL)
 594                                                 out_of_mem();
 595                                         port_list[port_len++] = svcport_str;
 596                                         svcport_str = NULL;
 597                                         mallocd_svcport = 0;
 598                                 }
 599                         }
 600                 }
 601         }
 602
 603         /*
 604          * Successfully bound the ports, so call complete_service() to
 605          * do the rest of the setup on the service(s).
 606          */
 607         sock_fdpos = 0;
 608         port_pos = 0;
 609         nc_handle = setnetconfig();
 610         while ((nconf = getnetconfig(nc_handle))) {
 611                 if (nconf->nc_flag & NC_VISIBLE) {
 612                         if (have_v6 == 0 && strcmp(nconf->nc_protofmly,
 613                             "inet6") == 0) {
 614                                 /* DO NOTHING */
 615                         } else if (port_list != NULL) {
 616                                 if (port_pos >= port_len) {
 617                                         syslog(LOG_ERR, "too many port#s");
 618                                         exit(1);
 619                                 }
 620                                 complete_service(nconf, port_list[port_pos++]);
 621                         } else
 622                                 complete_service(nconf, svcport_str);
 623                 }
 624         }
 625         endnetconfig(nc_handle);
 626         free(sock_fd);
 627         if (port_list != NULL) {
 628                 for (port_pos = 0; port_pos < port_len; port_pos++)
 629                         free(port_list[port_pos]);
 630                 free(port_list);
 631         }
 632
 633         if (xcreated == 0) {
 634                 syslog(LOG_ERR, "could not create any services");
 635                 exit(1);
 636         }
 637
 638         /* Expand svc_run() here so that we can call get_exportlist(). */
 639         for (;;) {
 640                 if (got_sighup) {
 641                         get_exportlist();
 642                         got_sighup = 0;
 643                 }
 644                 readfds = svc_fdset;
 645                 switch (select(svc_maxfd + 1, &readfds, NULL, NULL, NULL)) {
 646                 case -1:
 647                         if (errno == EINTR)
 648                                 continue;
 649                         syslog(LOG_ERR, "mountd died: select: %m");
 650                         exit(1);
 651                 case 0:
 652                         continue;
 653                 default:
 654                         svc_getreqset(&readfds);
 655                 }
 656         }
 657 }
 658
 659 /*
 660  * This routine creates and binds sockets on the appropriate
 661  * addresses. It gets called one time for each transport.
 662  * It returns 0 upon success, 1 for ingore the call and -1 to indicate
 663  * bind failed with EADDRINUSE.
 664  * Any file descriptors that have been created are stored in sock_fd and
 665  * the total count of them is maintained in sock_fdcnt.
 666  */
 667 static int
 668 create_service(struct netconfig *nconf)
 669 {
 670         struct addrinfo hints, *res = NULL;
 671         struct sockaddr_in *sin;
 672         struct sockaddr_in6 *sin6;
 673         struct __rpc_sockinfo si;
 674         int aicode;
 675         int fd;
 676         int nhostsbak;
 677         int one = 1;
 678         int r;
 679         u_int32_t host_addr[4];  /* IPv4 or IPv6 */
 680         int mallocd_res;
 681
 682         if ((nconf->nc_semantics != NC_TPI_CLTS) &&
 683             (nconf->nc_semantics != NC_TPI_COTS) &&
 684             (nconf->nc_semantics != NC_TPI_COTS_ORD))
 685                 return (1);     /* not my type */
 686
 687         /*
 688          * XXX - using RPC library internal functions.
 689          */
 690         if (!__rpc_nconf2sockinfo(nconf, &si)) {
 691                 syslog(LOG_ERR, "cannot get information for %s",
 692                     nconf->nc_netid);
 693                 return (1);
 694         }
 695
 696         /* Get mountd's address on this transport */
 697         memset(&hints, 0, sizeof hints);
 698         hints.ai_family = si.si_af;
 699         hints.ai_socktype = si.si_socktype;
 700         hints.ai_protocol = si.si_proto;
 701
 702         /*
 703          * Bind to specific IPs if asked to
 704          */
 705         nhostsbak = nhosts;
 706         while (nhostsbak > 0) {
 707                 --nhostsbak;
 708                 sock_fd = realloc(sock_fd, (sock_fdcnt + 1) * sizeof(int));
 709                 if (sock_fd == NULL)
 710                         out_of_mem();
 711                 sock_fd[sock_fdcnt++] = -1;     /* Set invalid for now. */
 712                 mallocd_res = 0;
 713
 714                 hints.ai_flags = AI_PASSIVE;
 715
 716                 /*
 717                  * XXX - using RPC library internal functions.
 718                  */
 719                 if ((fd = __rpc_nconf2fd(nconf)) < 0) {
 720                         int non_fatal = 0;
 721                         if (errno == EAFNOSUPPORT &&
 722                             nconf->nc_semantics != NC_TPI_CLTS)
 723                                 non_fatal = 1;
 724
 725                         syslog(non_fatal ? LOG_DEBUG : LOG_ERR,
 726                             "cannot create socket for %s", nconf->nc_netid);
 727                         if (non_fatal != 0)
 728                                 continue;
 729                         exit(1);
 730                 }
 731
 732                 switch (hints.ai_family) {
 733                 case AF_INET:
 734                         if (inet_pton(AF_INET, hosts[nhostsbak],
 735                             host_addr) == 1) {
 736                                 hints.ai_flags |= AI_NUMERICHOST;
 737                         } else {
 738                                 /*
 739                                  * Skip if we have an AF_INET6 address.
 740                                  */
 741                                 if (inet_pton(AF_INET6, hosts[nhostsbak],
 742                                     host_addr) == 1) {
 743                                         close(fd);
 744                                         continue;
 745                                 }
 746                         }
 747                         break;
 748                 case AF_INET6:
 749                         if (inet_pton(AF_INET6, hosts[nhostsbak],
 750                             host_addr) == 1) {
 751                                 hints.ai_flags |= AI_NUMERICHOST;
 752                         } else {
 753                                 /*
 754                                  * Skip if we have an AF_INET address.
 755                                  */
 756                                 if (inet_pton(AF_INET, hosts[nhostsbak],
 757                                     host_addr) == 1) {
 758                                         close(fd);
 759                                         continue;
 760                                 }
 761                         }
 762
 763                         /*
 764                          * We're doing host-based access checks here, so don't
 765                          * allow v4-in-v6 to confuse things. The kernel will
 766                          * disable it by default on NFS sockets too.
 767                          */
 768                         if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one,
 769                             sizeof one) < 0) {
 770                                 syslog(LOG_ERR,
 771                                     "can't disable v4-in-v6 on IPv6 socket");
 772                                 exit(1);
 773                         }
 774                         break;
 775                 default:
 776                         break;
 777                 }
 778
 779                 /*
 780                  * If no hosts were specified, just bind to INADDR_ANY
 781                  */
 782                 if (strcmp("*", hosts[nhostsbak]) == 0) {
 783                         if (svcport_str == NULL) {
 784                                 res = malloc(sizeof(struct addrinfo));
 785                                 if (res == NULL)
 786                                         out_of_mem();
 787                                 mallocd_res = 1;
 788                                 res->ai_flags = hints.ai_flags;
 789                                 res->ai_family = hints.ai_family;
 790                                 res->ai_protocol = hints.ai_protocol;
 791                                 switch (res->ai_family) {
 792                                 case AF_INET:
 793                                         sin = malloc(sizeof(struct sockaddr_in));
 794                                         if (sin == NULL)
 795                                                 out_of_mem();
 796                                         sin->sin_family = AF_INET;
 797                                         sin->sin_port = htons(0);
 798                                         sin->sin_addr.s_addr = htonl(INADDR_ANY);
 799                                         res->ai_addr = (struct sockaddr*) sin;
 800                                         res->ai_addrlen = (socklen_t)
 801                                             sizeof(struct sockaddr_in);
 802                                         break;
 803                                 case AF_INET6:
 804                                         sin6 = malloc(sizeof(struct sockaddr_in6));
 805                                         if (sin6 == NULL)
 806                                                 out_of_mem();
 807                                         sin6->sin6_family = AF_INET6;
 808                                         sin6->sin6_port = htons(0);
 809                                         sin6->sin6_addr = in6addr_any;
 810                                         res->ai_addr = (struct sockaddr*) sin6;
 811                                         res->ai_addrlen = (socklen_t)
 812                                             sizeof(struct sockaddr_in6);
 813                                         break;
 814                                 default:
 815                                         syslog(LOG_ERR, "bad addr fam %d",
 816                                             res->ai_family);
 817                                         exit(1);
 818                                 }
 819                         } else {
 820                                 if ((aicode = getaddrinfo(NULL, svcport_str,
 821                                     &hints, &res)) != 0) {
 822                                         syslog(LOG_ERR,
 823                                             "cannot get local address for %s: %s",
 824                                             nconf->nc_netid,
 825                                             gai_strerror(aicode));
 826                                         close(fd);
 827                                         continue;
 828                                 }
 829                         }
 830                 } else {
 831                         if ((aicode = getaddrinfo(hosts[nhostsbak], svcport_str,
 832                             &hints, &res)) != 0) {
 833                                 syslog(LOG_ERR,
 834                                     "cannot get local address for %s: %s",
 835                                     nconf->nc_netid, gai_strerror(aicode));
 836                                 close(fd);
 837                                 continue;
 838                         }
 839                 }
 840
 841                 /* Store the fd. */
 842                 sock_fd[sock_fdcnt - 1] = fd;
 843
 844                 /* Now, attempt the bind. */
 845                 r = bindresvport_sa(fd, res->ai_addr);
 846                 if (r != 0) {
 847                         if (errno == EADDRINUSE && mallocd_svcport != 0) {
 848                                 if (mallocd_res != 0) {
 849                                         free(res->ai_addr);
 850                                         free(res);
 851                                 } else
 852                                         freeaddrinfo(res);
 853                                 return (-1);
 854                         }
 855                         syslog(LOG_ERR, "bindresvport_sa: %m");
 856                         exit(1);
 857                 }
 858
 859                 if (svcport_str == NULL) {
 860                         svcport_str = malloc(NI_MAXSERV * sizeof(char));
 861                         if (svcport_str == NULL)
 862                                 out_of_mem();
 863                         mallocd_svcport = 1;
 864
 865                         if (getnameinfo(res->ai_addr,
 866                             res->ai_addr->sa_len, NULL, NI_MAXHOST,
 867                             svcport_str, NI_MAXSERV * sizeof(char),
 868                             NI_NUMERICHOST | NI_NUMERICSERV))
 869                                 errx(1, "Cannot get port number");
 870                 }
 871                 if (mallocd_res != 0) {
 872                         free(res->ai_addr);
 873                         free(res);
 874                 } else
 875                         freeaddrinfo(res);
 876                 res = NULL;
 877         }
 878         return (0);
 879 }
 880
 881 /*
 882  * Called after all the create_service() calls have succeeded, to complete
 883  * the setup and registration.
 884  */
 885 static void
 886 complete_service(struct netconfig *nconf, char *port_str)
 887 {
 888         struct addrinfo hints, *res = NULL;
 889         struct __rpc_sockinfo si;
 890         struct netbuf servaddr;
 891         SVCXPRT *transp = NULL;
 892         int aicode, fd, nhostsbak;
 893         int registered = 0;
 894
 895         if ((nconf->nc_semantics != NC_TPI_CLTS) &&
 896             (nconf->nc_semantics != NC_TPI_COTS) &&
 897             (nconf->nc_semantics != NC_TPI_COTS_ORD))
 898                 return; /* not my type */
 899
 900         /*
 901          * XXX - using RPC library internal functions.
 902          */
 903         if (!__rpc_nconf2sockinfo(nconf, &si)) {
 904                 syslog(LOG_ERR, "cannot get information for %s",
 905                     nconf->nc_netid);
 906                 return;
 907         }
 908
 909         nhostsbak = nhosts;
 910         while (nhostsbak > 0) {
 911                 --nhostsbak;
 912                 if (sock_fdpos >= sock_fdcnt) {
 913                         /* Should never happen. */
 914                         syslog(LOG_ERR, "Ran out of socket fd's");
 915                         return;
 916                 }
 917                 fd = sock_fd[sock_fdpos++];
 918                 if (fd < 0)
 919                         continue;
 920
 921                 if (nconf->nc_semantics != NC_TPI_CLTS)
 922                         listen(fd, SOMAXCONN);
 923
 924                 if (nconf->nc_semantics == NC_TPI_CLTS )
 925                         transp = svc_dg_create(fd, 0, 0);
 926                 else
 927                         transp = svc_vc_create(fd, RPC_MAXDATASIZE,
 928                             RPC_MAXDATASIZE);
 929
 930                 if (transp != (SVCXPRT *) NULL) {
 931                         if (!svc_reg(transp, MOUNTPROG, MOUNTVERS, mntsrv,
 932                             NULL))
 933                                 syslog(LOG_ERR,
 934                                     "can't register %s MOUNTVERS service",
 935                                     nconf->nc_netid);
 936                         if (!force_v2) {
 937                                 if (!svc_reg(transp, MOUNTPROG, MOUNTVERS3,
 938                                     mntsrv, NULL))
 939                                         syslog(LOG_ERR,
 940                                             "can't register %s MOUNTVERS3 service",
 941                                             nconf->nc_netid);
 942                         }
 943                 } else
 944                         syslog(LOG_WARNING, "can't create %s services",
 945                             nconf->nc_netid);
 946
 947                 if (registered == 0) {
 948                         registered = 1;
 949                         memset(&hints, 0, sizeof hints);
 950                         hints.ai_flags = AI_PASSIVE;
 951                         hints.ai_family = si.si_af;
 952                         hints.ai_socktype = si.si_socktype;
 953                         hints.ai_protocol = si.si_proto;
 954
 955                         if ((aicode = getaddrinfo(NULL, port_str, &hints,
 956                             &res)) != 0) {
 957                                 syslog(LOG_ERR, "cannot get local address: %s",
 958                                     gai_strerror(aicode));
 959                                 exit(1);
 960                         }
 961
 962                         servaddr.buf = malloc(res->ai_addrlen);
 963                         memcpy(servaddr.buf, res->ai_addr, res->ai_addrlen);
 964                         servaddr.len = res->ai_addrlen;
 965
 966                         rpcb_set(MOUNTPROG, MOUNTVERS, nconf, &servaddr);
 967                         rpcb_set(MOUNTPROG, MOUNTVERS3, nconf, &servaddr);
 968
 969                         xcreated++;
 970                         freeaddrinfo(res);
 971                 }
 972         } /* end while */
 973 }
 974
 975 /*
 976  * Clear out sockets after a failure to bind one of them, so that the
 977  * cycle of socket creation/binding can start anew.
 978  */
 979 static void
 980 clearout_service(void)
 981 {
 982         int i;
 983
 984         for (i = 0; i < sock_fdcnt; i++) {
 985                 if (sock_fd[i] >= 0) {
 986                         shutdown(sock_fd[i], SHUT_RDWR);
 987                         close(sock_fd[i]);
 988                 }
 989         }
 990 }
 991
 992 static void
 993 usage(void)
 994 {
 995         fprintf(stderr,
 996                 "usage: mountd [-2] [-d] [-e] [-l] [-n] [-p <port>] [-r] "
 997                 "[-S] [-h <bindip>] [export_file ...]\n");
 998         exit(1);
 999 }
1000
1001 /*
1002  * The mount rpc service
1003  */
1004 void
1005 mntsrv(struct svc_req *rqstp, SVCXPRT *transp)
1006 {
1007         struct exportlist *ep;
1008         struct dirlist *dp;
1009         struct fhreturn fhr;
1010         struct stat stb;
1011         struct statfs fsb;
1012         char host[NI_MAXHOST], numerichost[NI_MAXHOST];
1013         int lookup_failed = 1;
1014         struct sockaddr *saddr;
1015         u_short sport;
1016         char rpcpath[MNTPATHLEN + 1], dirpath[MAXPATHLEN];
1017         int bad = 0, defset, hostset;
1018         sigset_t sighup_mask;
1019         int numsecflavors, *secflavorsp;
1020
1021         sigemptyset(&sighup_mask);
1022         sigaddset(&sighup_mask, SIGHUP);
1023         saddr = svc_getrpccaller(transp)->buf;
1024         switch (saddr->sa_family) {
1025         case AF_INET6:
1026                 sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port);
1027                 break;
1028         case AF_INET:
1029                 sport = ntohs(((struct sockaddr_in *)saddr)->sin_port);
1030                 break;
1031         default:
1032                 syslog(LOG_ERR, "request from unknown address family");
1033                 return;
1034         }
1035         lookup_failed = getnameinfo(saddr, saddr->sa_len, host, sizeof host,
1036             NULL, 0, 0);
1037         getnameinfo(saddr, saddr->sa_len, numerichost,
1038             sizeof numerichost, NULL, 0, NI_NUMERICHOST);
1039         switch (rqstp->rq_proc) {
1040         case NULLPROC:
1041                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
1042                         syslog(LOG_ERR, "can't send reply");
1043                 return;
1044         case MOUNTPROC_MNT:
1045                 if (sport >= IPPORT_RESERVED && resvport_only) {
1046                         syslog(LOG_NOTICE,
1047                             "mount request from %s from unprivileged port",
1048                             numerichost);
1049                         svcerr_weakauth(transp);
1050                         return;
1051                 }
1052                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
1053                         syslog(LOG_NOTICE, "undecodable mount request from %s",
1054                             numerichost);
1055                         svcerr_decode(transp);
1056                         return;
1057                 }
1058
1059                 /*
1060                  * Get the real pathname and make sure it is a directory
1061                  * or a regular file if the -r option was specified
1062                  * and it exists.
1063                  */
1064                 if (realpath(rpcpath, dirpath) == NULL ||
1065                     stat(dirpath, &stb) < 0 ||
1066                     (!S_ISDIR(stb.st_mode) &&
1067                     (dir_only || !S_ISREG(stb.st_mode))) ||
1068                     statfs(dirpath, &fsb) < 0) {
1069                         chdir("/");     /* Just in case realpath doesn't */
1070                         syslog(LOG_NOTICE,
1071                             "mount request from %s for non existent path %s",
1072                             numerichost, dirpath);
1073                         if (debug)
1074                                 warnx("stat failed on %s", dirpath);
1075                         bad = ENOENT;   /* We will send error reply later */
1076                 }
1077
1078                 /* Check in the exports list */
1079                 sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
1080                 ep = ex_search(&fsb.f_fsid);
1081                 hostset = defset = 0;
1082                 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset,
1083                     &numsecflavors, &secflavorsp) ||
1084                     ((dp = dirp_search(ep->ex_dirl, dirpath)) &&
1085                       chk_host(dp, saddr, &defset, &hostset, &numsecflavors,
1086                        &secflavorsp)) ||
1087                     (defset && scan_tree(ep->ex_defdir, saddr) == 0 &&
1088                      scan_tree(ep->ex_dirl, saddr) == 0))) {
1089                         if (bad) {
1090                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
1091                                     (caddr_t)&bad))
1092                                         syslog(LOG_ERR, "can't send reply");
1093                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1094                                 return;
1095                         }
1096                         if (hostset & DP_HOSTSET) {
1097                                 fhr.fhr_flag = hostset;
1098                                 fhr.fhr_numsecflavors = numsecflavors;
1099                                 fhr.fhr_secflavors = secflavorsp;
1100                         } else {
1101                                 fhr.fhr_flag = defset;
1102                                 fhr.fhr_numsecflavors = ep->ex_defnumsecflavors;
1103                                 fhr.fhr_secflavors = ep->ex_defsecflavors;
1104                         }
1105                         fhr.fhr_vers = rqstp->rq_vers;
1106                         /* Get the file handle */
1107                         memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t));
1108                         if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) {
1109                                 bad = errno;
1110                                 syslog(LOG_ERR, "can't get fh for %s", dirpath);
1111                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
1112                                     (caddr_t)&bad))
1113                                         syslog(LOG_ERR, "can't send reply");
1114                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1115                                 return;
1116                         }
1117                         if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs,
1118                             (caddr_t)&fhr))
1119                                 syslog(LOG_ERR, "can't send reply");
1120                         if (!lookup_failed)
1121                                 add_mlist(host, dirpath);
1122                         else
1123                                 add_mlist(numerichost, dirpath);
1124                         if (debug)
1125                                 warnx("mount successful");
1126                         if (dolog)
1127                                 syslog(LOG_NOTICE,
1128                                     "mount request succeeded from %s for %s",
1129                                     numerichost, dirpath);
1130                 } else {
1131                         bad = EACCES;
1132                         syslog(LOG_NOTICE,
1133                             "mount request denied from %s for %s",
1134                             numerichost, dirpath);
1135                 }
1136
1137                 if (bad && !svc_sendreply(transp, (xdrproc_t)xdr_long,
1138                     (caddr_t)&bad))
1139                         syslog(LOG_ERR, "can't send reply");
1140                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1141                 return;
1142         case MOUNTPROC_DUMP:
1143                 if (!svc_sendreply(transp, (xdrproc_t)xdr_mlist, (caddr_t)NULL))
1144                         syslog(LOG_ERR, "can't send reply");
1145                 else if (dolog)
1146                         syslog(LOG_NOTICE,
1147                             "dump request succeeded from %s",
1148                             numerichost);
1149                 return;
1150         case MOUNTPROC_UMNT:
1151                 if (sport >= IPPORT_RESERVED && resvport_only) {
1152                         syslog(LOG_NOTICE,
1153                             "umount request from %s from unprivileged port",
1154                             numerichost);
1155                         svcerr_weakauth(transp);
1156                         return;
1157                 }
1158                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
1159                         syslog(LOG_NOTICE, "undecodable umount request from %s",
1160                             numerichost);
1161                         svcerr_decode(transp);
1162                         return;
1163                 }
1164                 if (realpath(rpcpath, dirpath) == NULL) {
1165                         syslog(LOG_NOTICE, "umount request from %s "
1166                             "for non existent path %s",
1167                             numerichost, dirpath);
1168                 }
1169                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL))
1170                         syslog(LOG_ERR, "can't send reply");
1171                 if (!lookup_failed)
1172                         del_mlist(host, dirpath);
1173                 del_mlist(numerichost, dirpath);
1174                 if (dolog)
1175                         syslog(LOG_NOTICE,
1176                             "umount request succeeded from %s for %s",
1177                             numerichost, dirpath);
1178                 return;
1179         case MOUNTPROC_UMNTALL:
1180                 if (sport >= IPPORT_RESERVED && resvport_only) {
1181                         syslog(LOG_NOTICE,
1182                             "umountall request from %s from unprivileged port",
1183                             numerichost);
1184                         svcerr_weakauth(transp);
1185                         return;
1186                 }
1187                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL))
1188                         syslog(LOG_ERR, "can't send reply");
1189                 if (!lookup_failed)
1190                         del_mlist(host, NULL);
1191                 del_mlist(numerichost, NULL);
1192                 if (dolog)
1193                         syslog(LOG_NOTICE,
1194                             "umountall request succeeded from %s",
1195                             numerichost);
1196                 return;
1197         case MOUNTPROC_EXPORT:
1198                 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, (caddr_t)NULL))
1199                         if (!svc_sendreply(transp, (xdrproc_t)xdr_explist_brief,
1200                             (caddr_t)NULL))
1201                                 syslog(LOG_ERR, "can't send reply");
1202                 if (dolog)
1203                         syslog(LOG_NOTICE,
1204                             "export request succeeded from %s",
1205                             numerichost);
1206                 return;
1207         default:
1208                 svcerr_noproc(transp);
1209                 return;
1210         }
1211 }
1212
1213 /*
1214  * Xdr conversion for a dirpath string
1215  */
1216 int
1217 xdr_dir(XDR *xdrsp, char *dirp)
1218 {
1219         return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
1220 }
1221
1222 /*
1223  * Xdr routine to generate file handle reply
1224  */
1225 int
1226 xdr_fhs(XDR *xdrsp, caddr_t cp)
1227 {
1228         struct fhreturn *fhrp = (struct fhreturn *)cp;
1229         u_long ok = 0, len, auth;
1230         int i;
1231
1232         if (!xdr_long(xdrsp, &ok))
1233                 return (0);
1234         switch (fhrp->fhr_vers) {
1235         case 1:
1236                 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH));
1237         case 3:
1238                 len = NFSX_V3FH;
1239                 if (!xdr_long(xdrsp, &len))
1240                         return (0);
1241                 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len))
1242                         return (0);
1243                 if (fhrp->fhr_numsecflavors) {
1244                         if (!xdr_int(xdrsp, &fhrp->fhr_numsecflavors))
1245                                 return (0);
1246                         for (i = 0; i < fhrp->fhr_numsecflavors; i++)
1247                                 if (!xdr_int(xdrsp, &fhrp->fhr_secflavors[i]))
1248                                         return (0);
1249                         return (1);
1250                 } else {
1251                         auth = AUTH_SYS;
1252                         len = 1;
1253                         if (!xdr_long(xdrsp, &len))
1254                                 return (0);
1255                         return (xdr_long(xdrsp, &auth));
1256                 }
1257         };
1258         return (0);
1259 }
1260
1261 int
1262 xdr_mlist(XDR *xdrsp, caddr_t cp __unused)
1263 {
1264         struct mountlist *mlp;
1265         int true = 1;
1266         int false = 0;
1267         char *strp;
1268
1269         mlp = mlhead;
1270         while (mlp) {
1271                 if (!xdr_bool(xdrsp, &true))
1272                         return (0);
1273                 strp = &mlp->ml_host[0];
1274                 if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
1275                         return (0);
1276                 strp = &mlp->ml_dirp[0];
1277                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1278                         return (0);
1279                 mlp = mlp->ml_next;
1280         }
1281         if (!xdr_bool(xdrsp, &false))
1282                 return (0);
1283         return (1);
1284 }
1285
1286 /*
1287  * Xdr conversion for export list
1288  */
1289 int
1290 xdr_explist_common(XDR *xdrsp, caddr_t cp __unused, int brief)
1291 {
1292         struct exportlist *ep;
1293         int false = 0;
1294         int putdef;
1295         sigset_t sighup_mask;
1296
1297         sigemptyset(&sighup_mask);
1298         sigaddset(&sighup_mask, SIGHUP);
1299         sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
1300         ep = exphead;
1301         while (ep) {
1302                 putdef = 0;
1303                 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir,
1304                                &putdef, brief))
1305                         goto errout;
1306                 if (ep->ex_defdir && putdef == 0 &&
1307                         put_exlist(ep->ex_defdir, xdrsp, (struct dirlist *)NULL,
1308                         &putdef, brief))
1309                         goto errout;
1310                 ep = ep->ex_next;
1311         }
1312         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1313         if (!xdr_bool(xdrsp, &false))
1314                 return (0);
1315         return (1);
1316 errout:
1317         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1318         return (0);
1319 }
1320
1321 /*
1322  * Called from xdr_explist() to traverse the tree and export the
1323  * directory paths.
1324  */
1325 int
1326 put_exlist(struct dirlist *dp, XDR *xdrsp, struct dirlist *adp, int *putdefp,
1327         int brief)
1328 {
1329         struct grouplist *grp;
1330         struct hostlist *hp;
1331         int true = 1;
1332         int false = 0;
1333         int gotalldir = 0;
1334         char *strp;
1335
1336         if (dp) {
1337                 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp, brief))
1338                         return (1);
1339                 if (!xdr_bool(xdrsp, &true))
1340                         return (1);
1341                 strp = dp->dp_dirp;
1342                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1343                         return (1);
1344                 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) {
1345                         gotalldir = 1;
1346                         *putdefp = 1;
1347                 }
1348                 if (brief) {
1349                         if (!xdr_bool(xdrsp, &true))
1350                                 return (1);
1351                         strp = "(...)";
1352                         if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1353                                 return (1);
1354                 } else if ((dp->dp_flag & DP_DEFSET) == 0 &&
1355                     (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) {
1356                         hp = dp->dp_hosts;
1357                         while (hp) {
1358                                 grp = hp->ht_grp;
1359                                 if (grp->gr_type == GT_HOST) {
1360                                         if (!xdr_bool(xdrsp, &true))
1361                                                 return (1);
1362                                         strp = grp->gr_ptr.gt_addrinfo->ai_canonname;
1363                                         if (!xdr_string(xdrsp, &strp,
1364                                             MNTNAMLEN))
1365                                                 return (1);
1366                                 } else if (grp->gr_type == GT_NET) {
1367                                         if (!xdr_bool(xdrsp, &true))
1368                                                 return (1);
1369                                         strp = grp->gr_ptr.gt_net.nt_name;
1370                                         if (!xdr_string(xdrsp, &strp,
1371                                             MNTNAMLEN))
1372                                                 return (1);
1373                                 }
1374                                 hp = hp->ht_next;
1375                                 if (gotalldir && hp == (struct hostlist *)NULL) {
1376                                         hp = adp->dp_hosts;
1377                                         gotalldir = 0;
1378                                 }
1379                         }
1380                 }
1381                 if (!xdr_bool(xdrsp, &false))
1382                         return (1);
1383                 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp, brief))
1384                         return (1);
1385         }
1386         return (0);
1387 }
1388
1389 int
1390 xdr_explist(XDR *xdrsp, caddr_t cp)
1391 {
1392
1393         return xdr_explist_common(xdrsp, cp, 0);
1394 }
1395
1396 int
1397 xdr_explist_brief(XDR *xdrsp, caddr_t cp)
1398 {
1399
1400         return xdr_explist_common(xdrsp, cp, 1);
1401 }
1402
1403 char *line;
1404 int linesize;
1405 FILE *exp_file;
1406
1407 /*
1408  * Get the export list from one, currently open file
1409  */
1410 static void
1411 get_exportlist_one(void)
1412 {
1413         struct exportlist *ep, *ep2;
1414         struct grouplist *grp, *tgrp;
1415         struct exportlist **epp;
1416         struct dirlist *dirhead;
1417         struct statfs fsb;
1418         struct xucred anon;
1419         char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc;
1420         int len, has_host, exflags, got_nondir, dirplen, netgrp;
1421
1422         v4root_phase = 0;
1423         dirhead = (struct dirlist *)NULL;
1424         while (get_line()) {
1425                 if (debug)
1426                         warnx("got line %s", line);
1427                 cp = line;
1428                 nextfield(&cp, &endcp);
1429                 if (*cp == '#')
1430                         goto nextline;
1431
1432                 /*
1433                  * Set defaults.
1434                  */
1435                 has_host = FALSE;
1436                 anon = def_anon;
1437                 exflags = MNT_EXPORTED;
1438                 got_nondir = 0;
1439                 opt_flags = 0;
1440                 ep = (struct exportlist *)NULL;
1441                 dirp = NULL;
1442
1443                 /*
1444                  * Handle the V4 root dir.
1445                  */
1446                 if (*cp == 'V' && *(cp + 1) == '4' && *(cp + 2) == ':') {
1447                         /*
1448                          * V4: just indicates that it is the v4 root point,
1449                          * so skip over that and set v4root_phase.
1450                          */
1451                         if (v4root_phase > 0) {
1452                                 syslog(LOG_ERR, "V4:duplicate line, ignored");
1453                                 goto nextline;
1454                         }
1455                         v4root_phase = 1;
1456                         cp += 3;
1457                         nextfield(&cp, &endcp);
1458                 }
1459
1460                 /*
1461                  * Create new exports list entry
1462                  */
1463                 len = endcp-cp;
1464                 tgrp = grp = get_grp();
1465                 while (len > 0) {
1466                         if (len > MNTNAMLEN) {
1467                             getexp_err(ep, tgrp);
1468                             goto nextline;
1469                         }
1470                         if (*cp == '-') {
1471                             if (ep == (struct exportlist *)NULL) {
1472                                 getexp_err(ep, tgrp);
1473                                 goto nextline;
1474                             }
1475                             if (debug)
1476                                 warnx("doing opt %s", cp);
1477                             got_nondir = 1;
1478                             if (do_opt(&cp, &endcp, ep, grp, &has_host,
1479                                 &exflags, &anon)) {
1480                                 getexp_err(ep, tgrp);
1481                                 goto nextline;
1482                             }
1483                         } else if (*cp == '/') {
1484                             savedc = *endcp;
1485                             *endcp = '\0';
1486                             if (v4root_phase > 1) {
1487                                     if (dirp != NULL) {
1488                                         syslog(LOG_ERR, "Multiple V4 dirs");
1489                                         getexp_err(ep, tgrp);
1490                                         goto nextline;
1491                                     }
1492                             }
1493                             if (check_dirpath(cp) &&
1494                                 statfs(cp, &fsb) >= 0) {
1495                                 if ((fsb.f_flags & MNT_AUTOMOUNTED) != 0)
1496                                     syslog(LOG_ERR, "Warning: exporting of "
1497                                         "automounted fs %s not supported", cp);
1498                                 if (got_nondir) {
1499                                     syslog(LOG_ERR, "dirs must be first");
1500                                     getexp_err(ep, tgrp);
1501                                     goto nextline;
1502                                 }
1503                                 if (v4root_phase == 1) {
1504                                     if (dirp != NULL) {
1505                                         syslog(LOG_ERR, "Multiple V4 dirs");
1506                                         getexp_err(ep, tgrp);
1507                                         goto nextline;
1508                                     }
1509                                     if (strlen(v4root_dirpath) == 0) {
1510                                         strlcpy(v4root_dirpath, cp,
1511                                             sizeof (v4root_dirpath));
1512                                     } else if (strcmp(v4root_dirpath, cp)
1513                                         != 0) {
1514                                         syslog(LOG_ERR,
1515                                             "different V4 dirpath %s", cp);
1516                                         getexp_err(ep, tgrp);
1517                                         goto nextline;
1518                                     }
1519                                     dirp = cp;
1520                                     v4root_phase = 2;
1521                                     got_nondir = 1;
1522                                     ep = get_exp();
1523                                 } else {
1524                                     if (ep) {
1525                                         if (ep->ex_fs.val[0] !=
1526                                             fsb.f_fsid.val[0] ||
1527                                             ep->ex_fs.val[1] !=
1528                                             fsb.f_fsid.val[1]) {
1529                                                 getexp_err(ep, tgrp);
1530                                                 goto nextline;
1531                                         }
1532                                     } else {
1533                                         /*
1534                                          * See if this directory is already
1535                                          * in the list.
1536                                          */
1537                                         ep = ex_search(&fsb.f_fsid);
1538                                         if (ep == (struct exportlist *)NULL) {
1539                                             ep = get_exp();
1540                                             ep->ex_fs = fsb.f_fsid;
1541                                             ep->ex_fsdir = (char *)malloc
1542                                                 (strlen(fsb.f_mntonname) + 1);
1543                                             if (ep->ex_fsdir)
1544                                                 strcpy(ep->ex_fsdir,
1545                                                     fsb.f_mntonname);
1546                                             else
1547                                                 out_of_mem();
1548                                             if (debug)
1549                                                 warnx(
1550                                                   "making new ep fs=0x%x,0x%x",
1551                                                   fsb.f_fsid.val[0],
1552                                                   fsb.f_fsid.val[1]);
1553                                         } else if (debug)
1554                                             warnx("found ep fs=0x%x,0x%x",
1555                                                 fsb.f_fsid.val[0],
1556                                                 fsb.f_fsid.val[1]);
1557                                     }
1558
1559                                     /*
1560                                      * Add dirpath to export mount point.
1561                                      */
1562                                     dirp = add_expdir(&dirhead, cp, len);
1563                                     dirplen = len;
1564                                 }
1565                             } else {
1566                                 getexp_err(ep, tgrp);
1567                                 goto nextline;
1568                             }
1569                             *endcp = savedc;
1570                         } else {
1571                             savedc = *endcp;
1572                             *endcp = '\0';
1573                             got_nondir = 1;
1574                             if (ep == (struct exportlist *)NULL) {
1575                                 getexp_err(ep, tgrp);
1576                                 goto nextline;
1577                             }
1578
1579                             /*
1580                              * Get the host or netgroup.
1581                              */
1582                             setnetgrent(cp);
1583                             netgrp = getnetgrent(&hst, &usr, &dom);
1584                             do {
1585                                 if (has_host) {
1586                                     grp->gr_next = get_grp();
1587                                     grp = grp->gr_next;
1588                                 }
1589                                 if (netgrp) {
1590                                     if (hst == 0) {
1591                                         syslog(LOG_ERR,
1592                                 "null hostname in netgroup %s, skipping", cp);
1593                                         grp->gr_type = GT_IGNORE;
1594                                     } else if (get_host(hst, grp, tgrp)) {
1595                                         syslog(LOG_ERR,
1596                         "bad host %s in netgroup %s, skipping", hst, cp);
1597                                         grp->gr_type = GT_IGNORE;
1598                                     }
1599                                 } else if (get_host(cp, grp, tgrp)) {
1600                                     syslog(LOG_ERR, "bad host %s, skipping", cp);
1601                                     grp->gr_type = GT_IGNORE;
1602                                 }
1603                                 has_host = TRUE;
1604                             } while (netgrp && getnetgrent(&hst, &usr, &dom));
1605                             endnetgrent();
1606                             *endcp = savedc;
1607                         }
1608                         cp = endcp;
1609                         nextfield(&cp, &endcp);
1610                         len = endcp - cp;
1611                 }
1612                 if (check_options(dirhead)) {
1613                         getexp_err(ep, tgrp);
1614                         goto nextline;
1615                 }
1616                 if (!has_host) {
1617                         grp->gr_type = GT_DEFAULT;
1618                         if (debug)
1619                                 warnx("adding a default entry");
1620
1621                 /*
1622                  * Don't allow a network export coincide with a list of
1623                  * host(s) on the same line.
1624                  */
1625                 } else if ((opt_flags & OP_NET) && tgrp->gr_next) {
1626                         syslog(LOG_ERR, "network/host conflict");
1627                         getexp_err(ep, tgrp);
1628                         goto nextline;
1629
1630                 /*
1631                  * If an export list was specified on this line, make sure
1632                  * that we have at least one valid entry, otherwise skip it.
1633                  */
1634                 } else {
1635                         grp = tgrp;
1636                         while (grp && grp->gr_type == GT_IGNORE)
1637                                 grp = grp->gr_next;
1638                         if (! grp) {
1639                             getexp_err(ep, tgrp);
1640                             goto nextline;
1641                         }
1642                 }
1643
1644                 if (v4root_phase == 1) {
1645                         syslog(LOG_ERR, "V4:root, no dirp, ignored");
1646                         getexp_err(ep, tgrp);
1647                         goto nextline;
1648                 }
1649
1650                 /*
1651                  * Loop through hosts, pushing the exports into the kernel.
1652                  * After loop, tgrp points to the start of the list and
1653                  * grp points to the last entry in the list.
1654                  */
1655                 grp = tgrp;
1656                 do {
1657                         if (do_mount(ep, grp, exflags, &anon, dirp, dirplen,
1658                             &fsb)) {
1659                                 getexp_err(ep, tgrp);
1660                                 goto nextline;
1661                         }
1662                 } while (grp->gr_next && (grp = grp->gr_next));
1663
1664                 /*
1665                  * For V4: don't enter in mount lists.
1666                  */
1667                 if (v4root_phase > 0 && v4root_phase <= 2) {
1668                         /*
1669                          * Since these structures aren't used by mountd,
1670                          * free them up now.
1671                          */
1672                         if (ep != NULL)
1673                                 free_exp(ep);
1674                         while (tgrp != NULL) {
1675                                 grp = tgrp;
1676                                 tgrp = tgrp->gr_next;
1677                                 free_grp(grp);
1678                         }
1679                         goto nextline;
1680                 }
1681
1682                 /*
1683                  * Success. Update the data structures.
1684                  */
1685                 if (has_host) {
1686                         hang_dirp(dirhead, tgrp, ep, opt_flags);
1687                         grp->gr_next = grphead;
1688                         grphead = tgrp;
1689                 } else {
1690                         hang_dirp(dirhead, (struct grouplist *)NULL, ep,
1691                                 opt_flags);
1692                         free_grp(grp);
1693                 }
1694                 dirhead = (struct dirlist *)NULL;
1695                 if ((ep->ex_flag & EX_LINKED) == 0) {
1696                         ep2 = exphead;
1697                         epp = &exphead;
1698
1699                         /*
1700                          * Insert in the list in alphabetical order.
1701                          */
1702                         while (ep2 && strcmp(ep2->ex_fsdir, ep->ex_fsdir) < 0) {
1703                                 epp = &ep2->ex_next;
1704                                 ep2 = ep2->ex_next;
1705                         }
1706                         if (ep2)
1707                                 ep->ex_next = ep2;
1708                         *epp = ep;
1709                         ep->ex_flag |= EX_LINKED;
1710                 }
1711 nextline:
1712                 v4root_phase = 0;
1713                 if (dirhead) {
1714                         free_dir(dirhead);
1715                         dirhead = (struct dirlist *)NULL;
1716                 }
1717         }
1718 }
1719
1720 /*
1721  * Get the export list from all specified files
1722  */
1723 void
1724 get_exportlist(void)
1725 {
1726         struct exportlist *ep, *ep2;
1727         struct grouplist *grp, *tgrp;
1728         struct export_args export;
1729         struct iovec *iov;
1730         struct statfs *fsp, *mntbufp;
1731         struct xvfsconf vfc;
1732         char errmsg[255];
1733         int num, i;
1734         int iovlen;
1735         int done;
1736         struct nfsex_args eargs;
1737
1738         if (suspend_nfsd != 0)
1739                 (void)nfssvc(NFSSVC_SUSPENDNFSD, NULL);
1740         v4root_dirpath[0] = '\0';
1741         bzero(&export, sizeof(export));
1742         export.ex_flags = MNT_DELEXPORT;
1743         iov = NULL;
1744         iovlen = 0;
1745         bzero(errmsg, sizeof(errmsg));
1746
1747         /*
1748          * First, get rid of the old list
1749          */
1750         ep = exphead;
1751         while (ep) {
1752                 ep2 = ep;
1753                 ep = ep->ex_next;
1754                 free_exp(ep2);
1755         }
1756         exphead = (struct exportlist *)NULL;
1757
1758         grp = grphead;
1759         while (grp) {
1760                 tgrp = grp;
1761                 grp = grp->gr_next;
1762                 free_grp(tgrp);
1763         }
1764         grphead = (struct grouplist *)NULL;
1765
1766         /*
1767          * and the old V4 root dir.
1768          */
1769         bzero(&eargs, sizeof (eargs));
1770         eargs.export.ex_flags = MNT_DELEXPORT;
1771         if (run_v4server > 0 &&
1772             nfssvc(NFSSVC_V4ROOTEXPORT, (caddr_t)&eargs) < 0 &&
1773             errno != ENOENT)
1774                 syslog(LOG_ERR, "Can't delete exports for V4:");
1775
1776         /*
1777          * and clear flag that notes if a public fh has been exported.
1778          */
1779         has_publicfh = 0;
1780
1781         /*
1782          * And delete exports that are in the kernel for all local
1783          * filesystems.
1784          * XXX: Should know how to handle all local exportable filesystems.
1785          */
1786         num = getmntinfo(&mntbufp, MNT_NOWAIT);
1787
1788         if (num > 0) {
1789                 build_iovec(&iov, &iovlen, "fstype", NULL, 0);
1790                 build_iovec(&iov, &iovlen, "fspath", NULL, 0);
1791                 build_iovec(&iov, &iovlen, "from", NULL, 0);
1792                 build_iovec(&iov, &iovlen, "update", NULL, 0);
1793                 build_iovec(&iov, &iovlen, "export", &export, sizeof(export));
1794                 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
1795         }
1796
1797         for (i = 0; i < num; i++) {
1798                 fsp = &mntbufp[i];
1799                 if (getvfsbyname(fsp->f_fstypename, &vfc) != 0) {
1800                         syslog(LOG_ERR, "getvfsbyname() failed for %s",
1801                             fsp->f_fstypename);
1802                         continue;
1803                 }
1804
1805                 /*
1806                  * We do not need to delete "export" flag from
1807                  * filesystems that do not have it set.
1808                  */
1809                 if (!(fsp->f_flags & MNT_EXPORTED))
1810                     continue;
1811                 /*
1812                  * Do not delete export for network filesystem by
1813                  * passing "export" arg to nmount().
1814                  * It only makes sense to do this for local filesystems.
1815                  */
1816                 if (vfc.vfc_flags & VFCF_NETWORK)
1817                         continue;
1818
1819                 iov[1].iov_base = fsp->f_fstypename;
1820                 iov[1].iov_len = strlen(fsp->f_fstypename) + 1;
1821                 iov[3].iov_base = fsp->f_mntonname;
1822                 iov[3].iov_len = strlen(fsp->f_mntonname) + 1;
1823                 iov[5].iov_base = fsp->f_mntfromname;
1824                 iov[5].iov_len = strlen(fsp->f_mntfromname) + 1;
1825                 errmsg[0] = '\0';
1826
1827                 /*
1828                  * EXDEV is returned when path exists but is not a
1829                  * mount point.  May happens if raced with unmount.
1830                  */
1831                 if (nmount(iov, iovlen, fsp->f_flags) < 0 &&
1832                     errno != ENOENT && errno != ENOTSUP && errno != EXDEV) {
1833                         syslog(LOG_ERR,
1834                             "can't delete exports for %s: %m %s",
1835                             fsp->f_mntonname, errmsg);
1836                 }
1837         }
1838
1839         if (iov != NULL) {
1840                 /* Free strings allocated by strdup() in getmntopts.c */
1841                 free(iov[0].iov_base); /* fstype */
1842                 free(iov[2].iov_base); /* fspath */
1843                 free(iov[4].iov_base); /* from */
1844                 free(iov[6].iov_base); /* update */
1845                 free(iov[8].iov_base); /* export */
1846                 free(iov[10].iov_base); /* errmsg */
1847
1848                 /* free iov, allocated by realloc() */
1849                 free(iov);
1850                 iovlen = 0;
1851         }
1852
1853         /*
1854          * Read in the exports file and build the list, calling
1855          * nmount() as we go along to push the export rules into the kernel.
1856          */
1857         done = 0;
1858         for (i = 0; exnames[i] != NULL; i++) {
1859                 if (debug)
1860                         warnx("reading exports from %s", exnames[i]);
1861                 if ((exp_file = fopen(exnames[i], "r")) == NULL) {
1862                         syslog(LOG_WARNING, "can't open %s", exnames[i]);
1863                         continue;
1864                 }
1865                 get_exportlist_one();
1866                 fclose(exp_file);
1867                 done++;
1868         }
1869         if (done == 0) {
1870                 syslog(LOG_ERR, "can't open any exports file");
1871                 exit(2);
1872         }
1873
1874         /*
1875          * If there was no public fh, clear any previous one set.
1876          */
1877         if (run_v4server > 0 && has_publicfh == 0)
1878                 (void) nfssvc(NFSSVC_NOPUBLICFH, NULL);
1879
1880         /* Resume the nfsd. If they weren't suspended, this is harmless. */
1881         (void)nfssvc(NFSSVC_RESUMENFSD, NULL);
1882 }
1883
1884 /*
1885  * Allocate an export list element
1886  */
1887 struct exportlist *
1888 get_exp(void)
1889 {
1890         struct exportlist *ep;
1891
1892         ep = (struct exportlist *)calloc(1, sizeof (struct exportlist));
1893         if (ep == (struct exportlist *)NULL)
1894                 out_of_mem();
1895         return (ep);
1896 }
1897
1898 /*
1899  * Allocate a group list element
1900  */
1901 struct grouplist *
1902 get_grp(void)
1903 {
1904         struct grouplist *gp;
1905
1906         gp = (struct grouplist *)calloc(1, sizeof (struct grouplist));
1907         if (gp == (struct grouplist *)NULL)
1908                 out_of_mem();
1909         return (gp);
1910 }
1911
1912 /*
1913  * Clean up upon an error in get_exportlist().
1914  */
1915 void
1916 getexp_err(struct exportlist *ep, struct grouplist *grp)
1917 {
1918         struct grouplist *tgrp;
1919
1920         if (!(opt_flags & OP_QUIET))
1921                 syslog(LOG_ERR, "bad exports list line %s", line);
1922         if (ep && (ep->ex_flag & EX_LINKED) == 0)
1923                 free_exp(ep);
1924         while (grp) {
1925                 tgrp = grp;
1926                 grp = grp->gr_next;
1927                 free_grp(tgrp);
1928         }
1929 }
1930
1931 /*
1932  * Search the export list for a matching fs.
1933  */
1934 struct exportlist *
1935 ex_search(fsid_t *fsid)
1936 {
1937         struct exportlist *ep;
1938
1939         ep = exphead;
1940         while (ep) {
1941                 if (ep->ex_fs.val[0] == fsid->val[0] &&
1942                     ep->ex_fs.val[1] == fsid->val[1])
1943                         return (ep);
1944                 ep = ep->ex_next;
1945         }
1946         return (ep);
1947 }
1948
1949 /*
1950  * Add a directory path to the list.
1951  */
1952 char *
1953 add_expdir(struct dirlist **dpp, char *cp, int len)
1954 {
1955         struct dirlist *dp;
1956
1957         dp = (struct dirlist *)malloc(sizeof (struct dirlist) + len);
1958         if (dp == (struct dirlist *)NULL)
1959                 out_of_mem();
1960         dp->dp_left = *dpp;
1961         dp->dp_right = (struct dirlist *)NULL;
1962         dp->dp_flag = 0;
1963         dp->dp_hosts = (struct hostlist *)NULL;
1964         strcpy(dp->dp_dirp, cp);
1965         *dpp = dp;
1966         return (dp->dp_dirp);
1967 }
1968
1969 /*
1970  * Hang the dir list element off the dirpath binary tree as required
1971  * and update the entry for host.
1972  */
1973 void
1974 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep,
1975         int flags)
1976 {
1977         struct hostlist *hp;
1978         struct dirlist *dp2;
1979
1980         if (flags & OP_ALLDIRS) {
1981                 if (ep->ex_defdir)
1982                         free((caddr_t)dp);
1983                 else
1984                         ep->ex_defdir = dp;
1985                 if (grp == (struct grouplist *)NULL) {
1986                         ep->ex_defdir->dp_flag |= DP_DEFSET;
1987                         /* Save the default security flavors list. */
1988                         ep->ex_defnumsecflavors = ep->ex_numsecflavors;
1989                         if (ep->ex_numsecflavors > 0)
1990                                 memcpy(ep->ex_defsecflavors, ep->ex_secflavors,
1991                                     sizeof(ep->ex_secflavors));
1992                 } else while (grp) {
1993                         hp = get_ht();
1994                         hp->ht_grp = grp;
1995                         hp->ht_next = ep->ex_defdir->dp_hosts;
1996                         ep->ex_defdir->dp_hosts = hp;
1997                         /* Save the security flavors list for this host set. */
1998                         grp->gr_numsecflavors = ep->ex_numsecflavors;
1999                         if (ep->ex_numsecflavors > 0)
2000                                 memcpy(grp->gr_secflavors, ep->ex_secflavors,
2001                                     sizeof(ep->ex_secflavors));
2002                         grp = grp->gr_next;
2003                 }
2004         } else {
2005
2006                 /*
2007                  * Loop through the directories adding them to the tree.
2008                  */
2009                 while (dp) {
2010                         dp2 = dp->dp_left;
2011                         add_dlist(&ep->ex_dirl, dp, grp, flags, ep);
2012                         dp = dp2;
2013                 }
2014         }
2015 }
2016
2017 /*
2018  * Traverse the binary tree either updating a node that is already there
2019  * for the new directory or adding the new node.
2020  */
2021 void
2022 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp,
2023         int flags, struct exportlist *ep)
2024 {
2025         struct dirlist *dp;
2026         struct hostlist *hp;
2027         int cmp;
2028
2029         dp = *dpp;
2030         if (dp) {
2031                 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp);
2032                 if (cmp > 0) {
2033                         add_dlist(&dp->dp_left, newdp, grp, flags, ep);
2034                         return;
2035                 } else if (cmp < 0) {
2036                         add_dlist(&dp->dp_right, newdp, grp, flags, ep);
2037                         return;
2038                 } else
2039                         free((caddr_t)newdp);
2040         } else {
2041                 dp = newdp;
2042                 dp->dp_left = (struct dirlist *)NULL;
2043                 *dpp = dp;
2044         }
2045         if (grp) {
2046
2047                 /*
2048                  * Hang all of the host(s) off of the directory point.
2049                  */
2050                 do {
2051                         hp = get_ht();
2052                         hp->ht_grp = grp;
2053                         hp->ht_next = dp->dp_hosts;
2054                         dp->dp_hosts = hp;
2055                         /* Save the security flavors list for this host set. */
2056                         grp->gr_numsecflavors = ep->ex_numsecflavors;
2057                         if (ep->ex_numsecflavors > 0)
2058                                 memcpy(grp->gr_secflavors, ep->ex_secflavors,
2059                                     sizeof(ep->ex_secflavors));
2060                         grp = grp->gr_next;
2061                 } while (grp);
2062         } else {
2063                 dp->dp_flag |= DP_DEFSET;
2064                 /* Save the default security flavors list. */
2065                 ep->ex_defnumsecflavors = ep->ex_numsecflavors;
2066                 if (ep->ex_numsecflavors > 0)
2067                         memcpy(ep->ex_defsecflavors, ep->ex_secflavors,
2068                             sizeof(ep->ex_secflavors));
2069         }
2070 }
2071
2072 /*
2073  * Search for a dirpath on the export point.
2074  */
2075 struct dirlist *
2076 dirp_search(struct dirlist *dp, char *dirp)
2077 {
2078         int cmp;
2079
2080         if (dp) {
2081                 cmp = strcmp(dp->dp_dirp, dirp);
2082                 if (cmp > 0)
2083                         return (dirp_search(dp->dp_left, dirp));
2084                 else if (cmp < 0)
2085                         return (dirp_search(dp->dp_right, dirp));
2086                 else
2087                         return (dp);
2088         }
2089         return (dp);
2090 }
2091
2092 /*
2093  * Scan for a host match in a directory tree.
2094  */
2095 int
2096 chk_host(struct dirlist *dp, struct sockaddr *saddr, int *defsetp,
2097         int *hostsetp, int *numsecflavors, int **secflavorsp)
2098 {
2099         struct hostlist *hp;
2100         struct grouplist *grp;
2101         struct addrinfo *ai;
2102
2103         if (dp) {
2104                 if (dp->dp_flag & DP_DEFSET)
2105                         *defsetp = dp->dp_flag;
2106                 hp = dp->dp_hosts;
2107                 while (hp) {
2108                         grp = hp->ht_grp;
2109                         switch (grp->gr_type) {
2110                         case GT_HOST:
2111                                 ai = grp->gr_ptr.gt_addrinfo;
2112                                 for (; ai; ai = ai->ai_next) {
2113                                         if (!sacmp(ai->ai_addr, saddr, NULL)) {
2114                                                 *hostsetp =
2115                                                     (hp->ht_flag | DP_HOSTSET);
2116                                                 if (numsecflavors != NULL) {
2117                                                         *numsecflavors =
2118                                                             grp->gr_numsecflavors;
2119                                                         *secflavorsp =
2120                                                             grp->gr_secflavors;
2121                                                 }
2122                                                 return (1);
2123                                         }
2124                                 }
2125                                 break;
2126                         case GT_NET:
2127                                 if (!sacmp(saddr, (struct sockaddr *)
2128                                     &grp->gr_ptr.gt_net.nt_net,
2129                                     (struct sockaddr *)
2130                                     &grp->gr_ptr.gt_net.nt_mask)) {
2131                                         *hostsetp = (hp->ht_flag | DP_HOSTSET);
2132                                         if (numsecflavors != NULL) {
2133                                                 *numsecflavors =
2134                                                     grp->gr_numsecflavors;
2135                                                 *secflavorsp =
2136                                                     grp->gr_secflavors;
2137                                         }
2138                                         return (1);
2139                                 }
2140                                 break;
2141                         }
2142                         hp = hp->ht_next;
2143                 }
2144         }
2145         return (0);
2146 }
2147
2148 /*
2149  * Scan tree for a host that matches the address.
2150  */
2151 int
2152 scan_tree(struct dirlist *dp, struct sockaddr *saddr)
2153 {
2154         int defset, hostset;
2155
2156         if (dp) {
2157                 if (scan_tree(dp->dp_left, saddr))
2158                         return (1);
2159                 if (chk_host(dp, saddr, &defset, &hostset, NULL, NULL))
2160                         return (1);
2161                 if (scan_tree(dp->dp_right, saddr))
2162                         return (1);
2163         }
2164         return (0);
2165 }
2166
2167 /*
2168  * Traverse the dirlist tree and free it up.
2169  */
2170 void
2171 free_dir(struct dirlist *dp)
2172 {
2173
2174         if (dp) {
2175                 free_dir(dp->dp_left);
2176                 free_dir(dp->dp_right);
2177                 free_host(dp->dp_hosts);
2178                 free((caddr_t)dp);
2179         }
2180 }
2181
2182 /*
2183  * Parse a colon separated list of security flavors
2184  */
2185 int
2186 parsesec(char *seclist, struct exportlist *ep)
2187 {
2188         char *cp, savedc;
2189         int flavor;
2190
2191         ep->ex_numsecflavors = 0;
2192         for (;;) {
2193                 cp = strchr(seclist, ':');
2194                 if (cp) {
2195                         savedc = *cp;
2196                         *cp = '\0';
2197                 }
2198
2199                 if (!strcmp(seclist, "sys"))
2200                         flavor = AUTH_SYS;
2201                 else if (!strcmp(seclist, "krb5"))
2202                         flavor = RPCSEC_GSS_KRB5;
2203                 else if (!strcmp(seclist, "krb5i"))
2204                         flavor = RPCSEC_GSS_KRB5I;
2205                 else if (!strcmp(seclist, "krb5p"))
2206                         flavor = RPCSEC_GSS_KRB5P;
2207                 else {
2208                         if (cp)
2209                                 *cp = savedc;
2210                         syslog(LOG_ERR, "bad sec flavor: %s", seclist);
2211                         return (1);
2212                 }
2213                 if (ep->ex_numsecflavors == MAXSECFLAVORS) {
2214                         if (cp)
2215                                 *cp = savedc;
2216                         syslog(LOG_ERR, "too many sec flavors: %s", seclist);
2217                         return (1);
2218                 }
2219                 ep->ex_secflavors[ep->ex_numsecflavors] = flavor;
2220                 ep->ex_numsecflavors++;
2221                 if (cp) {
2222                         *cp = savedc;
2223                         seclist = cp + 1;
2224                 } else {
2225                         break;
2226                 }
2227         }
2228         return (0);
2229 }
2230
2231 /*
2232  * Parse the option string and update fields.
2233  * Option arguments may either be -<option>=<value> or
2234  * -<option> <value>
2235  */
2236 int
2237 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp,
2238         int *has_hostp, int *exflagsp, struct xucred *cr)
2239 {
2240         char *cpoptarg, *cpoptend;
2241         char *cp, *endcp, *cpopt, savedc, savedc2;
2242         int allflag, usedarg;
2243
2244         savedc2 = '\0';
2245         cpopt = *cpp;
2246         cpopt++;
2247         cp = *endcpp;
2248         savedc = *cp;
2249         *cp = '\0';
2250         while (cpopt && *cpopt) {
2251                 allflag = 1;
2252                 usedarg = -2;
2253                 if ((cpoptend = strchr(cpopt, ','))) {
2254                         *cpoptend++ = '\0';
2255                         if ((cpoptarg = strchr(cpopt, '=')))
2256                                 *cpoptarg++ = '\0';
2257                 } else {
2258                         if ((cpoptarg = strchr(cpopt, '=')))
2259                                 *cpoptarg++ = '\0';
2260                         else {
2261                                 *cp = savedc;
2262                                 nextfield(&cp, &endcp);
2263                                 **endcpp = '\0';
2264                                 if (endcp > cp && *cp != '-') {
2265                                         cpoptarg = cp;
2266                                         savedc2 = *endcp;
2267                                         *endcp = '\0';
2268                                         usedarg = 0;
2269                                 }
2270                         }
2271                 }
2272                 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) {
2273                         *exflagsp |= MNT_EXRDONLY;
2274                 } else if (cpoptarg && (!strcmp(cpopt, "maproot") ||
2275                     !(allflag = strcmp(cpopt, "mapall")) ||
2276                     !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) {
2277                         usedarg++;
2278                         parsecred(cpoptarg, cr);
2279                         if (allflag == 0) {
2280                                 *exflagsp |= MNT_EXPORTANON;
2281                                 opt_flags |= OP_MAPALL;
2282                         } else
2283                                 opt_flags |= OP_MAPROOT;
2284                 } else if (cpoptarg && (!strcmp(cpopt, "mask") ||
2285                     !strcmp(cpopt, "m"))) {
2286                         if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) {
2287                                 syslog(LOG_ERR, "bad mask: %s", cpoptarg);
2288                                 return (1);
2289                         }
2290                         usedarg++;
2291                         opt_flags |= OP_MASK;
2292                 } else if (cpoptarg && (!strcmp(cpopt, "network") ||
2293                         !strcmp(cpopt, "n"))) {
2294                         if (strchr(cpoptarg, '/') != NULL) {
2295                                 if (debug)
2296                                         fprintf(stderr, "setting OP_MASKLEN\n");
2297                                 opt_flags |= OP_MASKLEN;
2298                         }
2299                         if (grp->gr_type != GT_NULL) {
2300                                 syslog(LOG_ERR, "network/host conflict");
2301                                 return (1);
2302                         } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) {
2303                                 syslog(LOG_ERR, "bad net: %s", cpoptarg);
2304                                 return (1);
2305                         }
2306                         grp->gr_type = GT_NET;
2307                         *has_hostp = 1;
2308                         usedarg++;
2309                         opt_flags |= OP_NET;
2310                 } else if (!strcmp(cpopt, "alldirs")) {
2311                         opt_flags |= OP_ALLDIRS;
2312                 } else if (!strcmp(cpopt, "public")) {
2313                         *exflagsp |= MNT_EXPUBLIC;
2314                 } else if (!strcmp(cpopt, "webnfs")) {
2315                         *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON);
2316                         opt_flags |= OP_MAPALL;
2317                 } else if (cpoptarg && !strcmp(cpopt, "index")) {
2318                         ep->ex_indexfile = strdup(cpoptarg);
2319                 } else if (!strcmp(cpopt, "quiet")) {
2320                         opt_flags |= OP_QUIET;
2321                 } else if (cpoptarg && !strcmp(cpopt, "sec")) {
2322                         if (parsesec(cpoptarg, ep))
2323                                 return (1);
2324                         opt_flags |= OP_SEC;
2325                         usedarg++;
2326                 } else {
2327                         syslog(LOG_ERR, "bad opt %s", cpopt);
2328                         return (1);
2329                 }
2330                 if (usedarg >= 0) {
2331                         *endcp = savedc2;
2332                         **endcpp = savedc;
2333                         if (usedarg > 0) {
2334                                 *cpp = cp;
2335                                 *endcpp = endcp;
2336                         }
2337                         return (0);
2338                 }
2339                 cpopt = cpoptend;
2340         }
2341         **endcpp = savedc;
2342         return (0);
2343 }
2344
2345 /*
2346  * Translate a character string to the corresponding list of network
2347  * addresses for a hostname.
2348  */
2349 int
2350 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp)
2351 {
2352         struct grouplist *checkgrp;
2353         struct addrinfo *ai, *tai, hints;
2354         int ecode;
2355         char host[NI_MAXHOST];
2356
2357         if (grp->gr_type != GT_NULL) {
2358                 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp);
2359                 return (1);
2360         }
2361         memset(&hints, 0, sizeof hints);
2362         hints.ai_flags = AI_CANONNAME;
2363         hints.ai_protocol = IPPROTO_UDP;
2364         ecode = getaddrinfo(cp, NULL, &hints, &ai);
2365         if (ecode != 0) {
2366                 syslog(LOG_ERR,"can't get address info for host %s", cp);
2367                 return 1;
2368         }
2369         grp->gr_ptr.gt_addrinfo = ai;
2370         while (ai != NULL) {
2371                 if (ai->ai_canonname == NULL) {
2372                         if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host,
2373                             sizeof host, NULL, 0, NI_NUMERICHOST) != 0)
2374                                 strlcpy(host, "?", sizeof(host));
2375                         ai->ai_canonname = strdup(host);
2376                         ai->ai_flags |= AI_CANONNAME;
2377                 }
2378                 if (debug)
2379                         fprintf(stderr, "got host %s\n", ai->ai_canonname);
2380                 /*
2381                  * Sanity check: make sure we don't already have an entry
2382                  * for this host in the grouplist.
2383                  */
2384                 for (checkgrp = tgrp; checkgrp != NULL;
2385                     checkgrp = checkgrp->gr_next) {
2386                         if (checkgrp->gr_type != GT_HOST)
2387                                 continue;
2388                         for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL;
2389                             tai = tai->ai_next) {
2390                                 if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0)
2391                                         continue;
2392                                 if (debug)
2393                                         fprintf(stderr,
2394                                             "ignoring duplicate host %s\n",
2395                                             ai->ai_canonname);
2396                                 grp->gr_type = GT_IGNORE;
2397                                 return (0);
2398                         }
2399                 }
2400                 ai = ai->ai_next;
2401         }
2402         grp->gr_type = GT_HOST;
2403         return (0);
2404 }
2405
2406 /*
2407  * Free up an exports list component
2408  */
2409 void
2410 free_exp(struct exportlist *ep)
2411 {
2412
2413         if (ep->ex_defdir) {
2414                 free_host(ep->ex_defdir->dp_hosts);
2415                 free((caddr_t)ep->ex_defdir);
2416         }
2417         if (ep->ex_fsdir)
2418                 free(ep->ex_fsdir);
2419         if (ep->ex_indexfile)
2420                 free(ep->ex_indexfile);
2421         free_dir(ep->ex_dirl);
2422         free((caddr_t)ep);
2423 }
2424
2425 /*
2426  * Free hosts.
2427  */
2428 void
2429 free_host(struct hostlist *hp)
2430 {
2431         struct hostlist *hp2;
2432
2433         while (hp) {
2434                 hp2 = hp;
2435                 hp = hp->ht_next;
2436                 free((caddr_t)hp2);
2437         }
2438 }
2439
2440 struct hostlist *
2441 get_ht(void)
2442 {
2443         struct hostlist *hp;
2444
2445         hp = (struct hostlist *)malloc(sizeof (struct hostlist));
2446         if (hp == (struct hostlist *)NULL)
2447                 out_of_mem();
2448         hp->ht_next = (struct hostlist *)NULL;
2449         hp->ht_flag = 0;
2450         return (hp);
2451 }
2452
2453 /*
2454  * Out of memory, fatal
2455  */
2456 void
2457 out_of_mem(void)
2458 {
2459
2460         syslog(LOG_ERR, "out of memory");
2461         exit(2);
2462 }
2463
2464 /*
2465  * Do the nmount() syscall with the update flag to push the export info into
2466  * the kernel.
2467  */
2468 int
2469 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags,
2470     struct xucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb)
2471 {
2472         struct statfs fsb1;
2473         struct addrinfo *ai;
2474         struct export_args ea, *eap;
2475         char errmsg[255];
2476         char *cp;
2477         int done;
2478         char savedc;
2479         struct iovec *iov;
2480         int i, iovlen;
2481         int ret;
2482         struct nfsex_args nfsea;
2483
2484         if (run_v4server > 0)
2485                 eap = &nfsea.export;
2486         else
2487                 eap = &ea;
2488
2489         cp = NULL;
2490         savedc = '\0';
2491         iov = NULL;
2492         iovlen = 0;
2493         ret = 0;
2494
2495         bzero(eap, sizeof (struct export_args));
2496         bzero(errmsg, sizeof(errmsg));
2497         eap->ex_flags = exflags;
2498         eap->ex_anon = *anoncrp;
2499         eap->ex_indexfile = ep->ex_indexfile;
2500         if (grp->gr_type == GT_HOST)
2501                 ai = grp->gr_ptr.gt_addrinfo;
2502         else
2503                 ai = NULL;
2504         eap->ex_numsecflavors = ep->ex_numsecflavors;
2505         for (i = 0; i < eap->ex_numsecflavors; i++)
2506                 eap->ex_secflavors[i] = ep->ex_secflavors[i];
2507         if (eap->ex_numsecflavors == 0) {
2508                 eap->ex_numsecflavors = 1;
2509                 eap->ex_secflavors[0] = AUTH_SYS;
2510         }
2511         done = FALSE;
2512
2513         if (v4root_phase == 0) {
2514                 build_iovec(&iov, &iovlen, "fstype", NULL, 0);
2515                 build_iovec(&iov, &iovlen, "fspath", NULL, 0);
2516                 build_iovec(&iov, &iovlen, "from", NULL, 0);
2517                 build_iovec(&iov, &iovlen, "update", NULL, 0);
2518                 build_iovec(&iov, &iovlen, "export", eap,
2519                     sizeof (struct export_args));
2520                 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
2521         }
2522
2523         while (!done) {
2524                 switch (grp->gr_type) {
2525                 case GT_HOST:
2526                         if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0)
2527                                 goto skip;
2528                         eap->ex_addr = ai->ai_addr;
2529                         eap->ex_addrlen = ai->ai_addrlen;
2530                         eap->ex_masklen = 0;
2531                         break;
2532                 case GT_NET:
2533                         if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 &&
2534                             have_v6 == 0)
2535                                 goto skip;
2536                         eap->ex_addr =
2537                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net;
2538                         eap->ex_addrlen =
2539                             ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_net)->sa_len;
2540                         eap->ex_mask =
2541                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask;
2542                         eap->ex_masklen = ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask)->sa_len;
2543                         break;
2544                 case GT_DEFAULT:
2545                         eap->ex_addr = NULL;
2546                         eap->ex_addrlen = 0;
2547                         eap->ex_mask = NULL;
2548                         eap->ex_masklen = 0;
2549                         break;
2550                 case GT_IGNORE:
2551                         ret = 0;
2552                         goto error_exit;
2553                         break;
2554                 default:
2555                         syslog(LOG_ERR, "bad grouptype");
2556                         if (cp)
2557                                 *cp = savedc;
2558                         ret = 1;
2559                         goto error_exit;
2560                 };
2561
2562                 /*
2563                  * For V4:, use the nfssvc() syscall, instead of mount().
2564                  */
2565                 if (v4root_phase == 2) {
2566                         nfsea.fspec = v4root_dirpath;
2567                         if (run_v4server > 0 &&
2568                             nfssvc(NFSSVC_V4ROOTEXPORT, (caddr_t)&nfsea) < 0) {
2569                                 syslog(LOG_ERR, "Exporting V4: failed");
2570                                 return (2);
2571                         }
2572                 } else {
2573                         /*
2574                          * XXX:
2575                          * Maybe I should just use the fsb->f_mntonname path
2576                          * instead of looping back up the dirp to the mount
2577                          * point??
2578                          * Also, needs to know how to export all types of local
2579                          * exportable filesystems and not just "ufs".
2580                          */
2581                         iov[1].iov_base = fsb->f_fstypename; /* "fstype" */
2582                         iov[1].iov_len = strlen(fsb->f_fstypename) + 1;
2583                         iov[3].iov_base = fsb->f_mntonname; /* "fspath" */
2584                         iov[3].iov_len = strlen(fsb->f_mntonname) + 1;
2585                         iov[5].iov_base = fsb->f_mntfromname; /* "from" */
2586                         iov[5].iov_len = strlen(fsb->f_mntfromname) + 1;
2587                         errmsg[0] = '\0';
2588
2589                         while (nmount(iov, iovlen, fsb->f_flags) < 0) {
2590                                 if (cp)
2591                                         *cp-- = savedc;
2592                                 else
2593                                         cp = dirp + dirplen - 1;
2594                                 if (opt_flags & OP_QUIET) {
2595                                         ret = 1;
2596                                         goto error_exit;
2597                                 }
2598                                 if (errno == EPERM) {
2599                                         if (debug)
2600                                                 warnx("can't change attributes for %s: %s",
2601                                                     dirp, errmsg);
2602                                         syslog(LOG_ERR,
2603                                            "can't change attributes for %s: %s",
2604                                             dirp, errmsg);
2605                                         ret = 1;
2606                                         goto error_exit;
2607                                 }
2608                                 if (opt_flags & OP_ALLDIRS) {
2609                                         if (errno == EINVAL)
2610                                                 syslog(LOG_ERR,
2611                 "-alldirs requested but %s is not a filesystem mountpoint",
2612                                                     dirp);
2613                                         else
2614                                                 syslog(LOG_ERR,
2615                                                     "could not remount %s: %m",
2616                                                     dirp);
2617                                         ret = 1;
2618                                         goto error_exit;
2619                                 }
2620                                 /* back up over the last component */
2621                                 while (*cp == '/' && cp > dirp)
2622                                         cp--;
2623                                 while (*(cp - 1) != '/' && cp > dirp)
2624                                         cp--;
2625                                 if (cp == dirp) {
2626                                         if (debug)
2627                                                 warnx("mnt unsucc");
2628                                         syslog(LOG_ERR, "can't export %s %s",
2629                                             dirp, errmsg);
2630                                         ret = 1;
2631                                         goto error_exit;
2632                                 }
2633                                 savedc = *cp;
2634                                 *cp = '\0';
2635                                 /*
2636                                  * Check that we're still on the same
2637                                  * filesystem.
2638                                  */
2639                                 if (statfs(dirp, &fsb1) != 0 ||
2640                                     bcmp(&fsb1.f_fsid, &fsb->f_fsid,
2641                                     sizeof (fsb1.f_fsid)) != 0) {
2642                                         *cp = savedc;
2643                                         syslog(LOG_ERR,
2644                                             "can't export %s %s", dirp,
2645                                             errmsg);
2646                                         ret = 1;
2647                                         goto error_exit;
2648                                 }
2649                         }
2650                 }
2651
2652                 /*
2653                  * For the experimental server:
2654                  * If this is the public directory, get the file handle
2655                  * and load it into the kernel via the nfssvc() syscall.
2656                  */
2657                 if (run_v4server > 0 && (exflags & MNT_EXPUBLIC) != 0) {
2658                         fhandle_t fh;
2659                         char *public_name;
2660
2661                         if (eap->ex_indexfile != NULL)
2662                                 public_name = eap->ex_indexfile;
2663                         else
2664                                 public_name = dirp;
2665                         if (getfh(public_name, &fh) < 0)
2666                                 syslog(LOG_ERR,
2667                                     "Can't get public fh for %s", public_name);
2668                         else if (nfssvc(NFSSVC_PUBLICFH, (caddr_t)&fh) < 0)
2669                                 syslog(LOG_ERR,
2670                                     "Can't set public fh for %s", public_name);
2671                         else
2672                                 has_publicfh = 1;
2673                 }
2674 skip:
2675                 if (ai != NULL)
2676                         ai = ai->ai_next;
2677                 if (ai == NULL)
2678                         done = TRUE;
2679         }
2680         if (cp)
2681                 *cp = savedc;
2682 error_exit:
2683         /* free strings allocated by strdup() in getmntopts.c */
2684         if (iov != NULL) {
2685                 free(iov[0].iov_base); /* fstype */
2686                 free(iov[2].iov_base); /* fspath */
2687                 free(iov[4].iov_base); /* from */
2688                 free(iov[6].iov_base); /* update */
2689                 free(iov[8].iov_base); /* export */
2690                 free(iov[10].iov_base); /* errmsg */
2691
2692                 /* free iov, allocated by realloc() */
2693                 free(iov);
2694         }
2695         return (ret);
2696 }
2697
2698 /*
2699  * Translate a net address.
2700  *
2701  * If `maskflg' is nonzero, then `cp' is a netmask, not a network address.
2702  */
2703 int
2704 get_net(char *cp, struct netmsk *net, int maskflg)
2705 {
2706         struct netent *np = NULL;
2707         char *name, *p, *prefp;
2708         struct sockaddr_in sin;
2709         struct sockaddr *sa = NULL;
2710         struct addrinfo hints, *ai = NULL;
2711         char netname[NI_MAXHOST];
2712         long preflen;
2713
2714         p = prefp = NULL;
2715         if ((opt_flags & OP_MASKLEN) && !maskflg) {
2716                 p = strchr(cp, '/');
2717                 *p = '\0';
2718                 prefp = p + 1;
2719         }
2720
2721         /*
2722          * Check for a numeric address first. We wish to avoid
2723          * possible DNS lookups in getnetbyname().
2724          */
2725         if (isxdigit(*cp) || *cp == ':') {
2726                 memset(&hints, 0, sizeof hints);
2727                 /* Ensure the mask and the network have the same family. */
2728                 if (maskflg && (opt_flags & OP_NET))
2729                         hints.ai_family = net->nt_net.ss_family;
2730                 else if (!maskflg && (opt_flags & OP_HAVEMASK))
2731                         hints.ai_family = net->nt_mask.ss_family;
2732                 else
2733                         hints.ai_family = AF_UNSPEC;
2734                 hints.ai_flags = AI_NUMERICHOST;
2735                 if (getaddrinfo(cp, NULL, &hints, &ai) == 0)
2736                         sa = ai->ai_addr;
2737                 if (sa != NULL && ai->ai_family == AF_INET) {
2738                         /*
2739                          * The address in `cp' is really a network address, so
2740                          * use inet_network() to re-interpret this correctly.
2741                          * e.g. "127.1" means 127.1.0.0, not 127.0.0.1.
2742                          */
2743                         bzero(&sin, sizeof sin);
2744                         sin.sin_family = AF_INET;
2745                         sin.sin_len = sizeof sin;
2746                         sin.sin_addr = inet_makeaddr(inet_network(cp), 0);
2747                         if (debug)
2748                                 fprintf(stderr, "get_net: v4 addr %s\n",
2749                                     inet_ntoa(sin.sin_addr));
2750                         sa = (struct sockaddr *)&sin;
2751                 }
2752         }
2753         if (sa == NULL && (np = getnetbyname(cp)) != NULL) {
2754                 bzero(&sin, sizeof sin);
2755                 sin.sin_family = AF_INET;
2756                 sin.sin_len = sizeof sin;
2757                 sin.sin_addr = inet_makeaddr(np->n_net, 0);
2758                 sa = (struct sockaddr *)&sin;
2759         }
2760         if (sa == NULL)
2761                 goto fail;
2762
2763         if (maskflg) {
2764                 /* The specified sockaddr is a mask. */
2765                 if (checkmask(sa) != 0)
2766                         goto fail;
2767                 bcopy(sa, &net->nt_mask, sa->sa_len);
2768                 opt_flags |= OP_HAVEMASK;
2769         } else {
2770                 /* The specified sockaddr is a network address. */
2771                 bcopy(sa, &net->nt_net, sa->sa_len);
2772
2773                 /* Get a network name for the export list. */
2774                 if (np) {
2775                         name = np->n_name;
2776                 } else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname,
2777                    NULL, 0, NI_NUMERICHOST) == 0) {
2778                         name = netname;
2779                 } else {
2780                         goto fail;
2781                 }
2782                 if ((net->nt_name = strdup(name)) == NULL)
2783                         out_of_mem();
2784
2785                 /*
2786                  * Extract a mask from either a "/<masklen>" suffix, or
2787                  * from the class of an IPv4 address.
2788                  */
2789                 if (opt_flags & OP_MASKLEN) {
2790                         preflen = strtol(prefp, NULL, 10);
2791                         if (preflen < 0L || preflen == LONG_MAX)
2792                                 goto fail;
2793                         bcopy(sa, &net->nt_mask, sa->sa_len);
2794                         if (makemask(&net->nt_mask, (int)preflen) != 0)
2795                                 goto fail;
2796                         opt_flags |= OP_HAVEMASK;
2797                         *p = '/';
2798                 } else if (sa->sa_family == AF_INET &&
2799                     (opt_flags & OP_MASK) == 0) {
2800                         in_addr_t addr;
2801
2802                         addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
2803                         if (IN_CLASSA(addr))
2804                                 preflen = 8;
2805                         else if (IN_CLASSB(addr))
2806                                 preflen = 16;
2807                         else if (IN_CLASSC(addr))
2808                                 preflen = 24;
2809                         else if (IN_CLASSD(addr))
2810                                 preflen = 28;
2811                         else
2812                                 preflen = 32;   /* XXX */
2813
2814                         bcopy(sa, &net->nt_mask, sa->sa_len);
2815                         makemask(&net->nt_mask, (int)preflen);
2816                         opt_flags |= OP_HAVEMASK;
2817                 }
2818         }
2819
2820         if (ai)
2821                 freeaddrinfo(ai);
2822         return 0;
2823
2824 fail:
2825         if (ai)
2826                 freeaddrinfo(ai);
2827         return 1;
2828 }
2829
2830 /*
2831  * Parse out the next white space separated field
2832  */
2833 void
2834 nextfield(char **cp, char **endcp)
2835 {
2836         char *p;
2837
2838         p = *cp;
2839         while (*p == ' ' || *p == '\t')
2840                 p++;
2841         if (*p == '\n' || *p == '\0')
2842                 *cp = *endcp = p;
2843         else {
2844                 *cp = p++;
2845                 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
2846                         p++;
2847                 *endcp = p;
2848         }
2849 }
2850
2851 /*
2852  * Get an exports file line. Skip over blank lines and handle line
2853  * continuations.
2854  */
2855 int
2856 get_line(void)
2857 {
2858         char *p, *cp;
2859         size_t len;
2860         int totlen, cont_line;
2861
2862         /*
2863          * Loop around ignoring blank lines and getting all continuation lines.
2864          */
2865         p = line;
2866         totlen = 0;
2867         do {
2868                 if ((p = fgetln(exp_file, &len)) == NULL)
2869                         return (0);
2870                 cp = p + len - 1;
2871                 cont_line = 0;
2872                 while (cp >= p &&
2873                     (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) {
2874                         if (*cp == '\\')
2875                                 cont_line = 1;
2876                         cp--;
2877                         len--;
2878                 }
2879                 if (cont_line) {
2880                         *++cp = ' ';
2881                         len++;
2882                 }
2883                 if (linesize < len + totlen + 1) {
2884                         linesize = len + totlen + 1;
2885                         line = realloc(line, linesize);
2886                         if (line == NULL)
2887                                 out_of_mem();
2888                 }
2889                 memcpy(line + totlen, p, len);
2890                 totlen += len;
2891                 line[totlen] = '\0';
2892         } while (totlen == 0 || cont_line);
2893         return (1);
2894 }
2895
2896 /*
2897  * Parse a description of a credential.
2898  */
2899 void
2900 parsecred(char *namelist, struct xucred *cr)
2901 {
2902         char *name;
2903         int cnt;
2904         char *names;
2905         struct passwd *pw;
2906         struct group *gr;
2907         gid_t groups[XU_NGROUPS + 1];
2908         int ngroups;
2909
2910         cr->cr_version = XUCRED_VERSION;
2911         /*
2912          * Set up the unprivileged user.
2913          */
2914         cr->cr_uid = -2;
2915         cr->cr_groups[0] = -2;
2916         cr->cr_ngroups = 1;
2917         /*
2918          * Get the user's password table entry.
2919          */
2920         names = strsep_quote(&namelist, " \t\n");
2921         name = strsep(&names, ":");
2922         /* Bug?  name could be NULL here */
2923         if (isdigit(*name) || *name == '-')
2924                 pw = getpwuid(atoi(name));
2925         else
2926                 pw = getpwnam(name);
2927         /*
2928          * Credentials specified as those of a user.
2929          */
2930         if (names == NULL) {
2931                 if (pw == NULL) {
2932                         syslog(LOG_ERR, "unknown user: %s", name);
2933                         return;
2934                 }
2935                 cr->cr_uid = pw->pw_uid;
2936                 ngroups = XU_NGROUPS + 1;
2937                 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups))
2938                         syslog(LOG_ERR, "too many groups");
2939                 /*
2940                  * Compress out duplicate.
2941                  */
2942                 cr->cr_ngroups = ngroups - 1;
2943                 cr->cr_groups[0] = groups[0];
2944                 for (cnt = 2; cnt < ngroups; cnt++)
2945                         cr->cr_groups[cnt - 1] = groups[cnt];
2946                 return;
2947         }
2948         /*
2949          * Explicit credential specified as a colon separated list:
2950          *      uid:gid:gid:...
2951          */
2952         if (pw != NULL)
2953                 cr->cr_uid = pw->pw_uid;
2954         else if (isdigit(*name) || *name == '-')
2955                 cr->cr_uid = atoi(name);
2956         else {
2957                 syslog(LOG_ERR, "unknown user: %s", name);
2958                 return;
2959         }
2960         cr->cr_ngroups = 0;
2961         while (names != NULL && *names != '\0' && cr->cr_ngroups < XU_NGROUPS) {
2962                 name = strsep(&names, ":");
2963                 if (isdigit(*name) || *name == '-') {
2964                         cr->cr_groups[cr->cr_ngroups++] = atoi(name);
2965                 } else {
2966                         if ((gr = getgrnam(name)) == NULL) {
2967                                 syslog(LOG_ERR, "unknown group: %s", name);
2968                                 continue;
2969                         }
2970                         cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid;
2971                 }
2972         }
2973         if (names != NULL && *names != '\0' && cr->cr_ngroups == XU_NGROUPS)
2974                 syslog(LOG_ERR, "too many groups");
2975 }
2976
2977 #define STRSIZ  (MNTNAMLEN+MNTPATHLEN+50)
2978 /*
2979  * Routines that maintain the remote mounttab
2980  */
2981 void
2982 get_mountlist(void)
2983 {
2984         struct mountlist *mlp, **mlpp;
2985         char *host, *dirp, *cp;
2986         char str[STRSIZ];
2987         FILE *mlfile;
2988
2989         if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) {
2990                 if (errno == ENOENT)
2991                         return;
2992                 else {
2993                         syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST);
2994                         return;
2995                 }
2996         }
2997         mlpp = &mlhead;
2998         while (fgets(str, STRSIZ, mlfile) != NULL) {
2999                 cp = str;
3000                 host = strsep(&cp, " \t\n");
3001                 dirp = strsep(&cp, " \t\n");
3002                 if (host == NULL || dirp == NULL)
3003                         continue;
3004                 mlp = (struct mountlist *)malloc(sizeof (*mlp));
3005                 if (mlp == (struct mountlist *)NULL)
3006                         out_of_mem();
3007                 strncpy(mlp->ml_host, host, MNTNAMLEN);
3008                 mlp->ml_host[MNTNAMLEN] = '\0';
3009                 strncpy(mlp->ml_dirp, dirp, MNTPATHLEN);
3010                 mlp->ml_dirp[MNTPATHLEN] = '\0';
3011                 mlp->ml_next = (struct mountlist *)NULL;
3012                 *mlpp = mlp;
3013                 mlpp = &mlp->ml_next;
3014         }
3015         fclose(mlfile);
3016 }
3017
3018 void
3019 del_mlist(char *hostp, char *dirp)
3020 {
3021         struct mountlist *mlp, **mlpp;
3022         struct mountlist *mlp2;
3023         FILE *mlfile;
3024         int fnd = 0;
3025
3026         mlpp = &mlhead;
3027         mlp = mlhead;
3028         while (mlp) {
3029                 if (!strcmp(mlp->ml_host, hostp) &&
3030                     (!dirp || !strcmp(mlp->ml_dirp, dirp))) {
3031                         fnd = 1;
3032                         mlp2 = mlp;
3033                         *mlpp = mlp = mlp->ml_next;
3034                         free((caddr_t)mlp2);
3035                 } else {
3036                         mlpp = &mlp->ml_next;
3037                         mlp = mlp->ml_next;
3038                 }
3039         }
3040         if (fnd) {
3041                 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) {
3042                         syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST);
3043                         return;
3044                 }
3045                 mlp = mlhead;
3046                 while (mlp) {
3047                         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
3048                         mlp = mlp->ml_next;
3049                 }
3050                 fclose(mlfile);
3051         }
3052 }
3053
3054 void
3055 add_mlist(char *hostp, char *dirp)
3056 {
3057         struct mountlist *mlp, **mlpp;
3058         FILE *mlfile;
3059
3060         mlpp = &mlhead;
3061         mlp = mlhead;
3062         while (mlp) {
3063                 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp))
3064                         return;
3065                 mlpp = &mlp->ml_next;
3066                 mlp = mlp->ml_next;
3067         }
3068         mlp = (struct mountlist *)malloc(sizeof (*mlp));
3069         if (mlp == (struct mountlist *)NULL)
3070                 out_of_mem();
3071         strncpy(mlp->ml_host, hostp, MNTNAMLEN);
3072         mlp->ml_host[MNTNAMLEN] = '\0';
3073         strncpy(mlp->ml_dirp, dirp, MNTPATHLEN);
3074         mlp->ml_dirp[MNTPATHLEN] = '\0';
3075         mlp->ml_next = (struct mountlist *)NULL;
3076         *mlpp = mlp;
3077         if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
3078                 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST);
3079                 return;
3080         }
3081         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
3082         fclose(mlfile);
3083 }
3084
3085 /*
3086  * Free up a group list.
3087  */
3088 void
3089 free_grp(struct grouplist *grp)
3090 {
3091         if (grp->gr_type == GT_HOST) {
3092                 if (grp->gr_ptr.gt_addrinfo != NULL)
3093                         freeaddrinfo(grp->gr_ptr.gt_addrinfo);
3094         } else if (grp->gr_type == GT_NET) {
3095                 if (grp->gr_ptr.gt_net.nt_name)
3096                         free(grp->gr_ptr.gt_net.nt_name);
3097         }
3098         free((caddr_t)grp);
3099 }
3100
3101 #ifdef DEBUG
3102 void
3103 SYSLOG(int pri, const char *fmt, ...)
3104 {
3105         va_list ap;
3106
3107         va_start(ap, fmt);
3108         vfprintf(stderr, fmt, ap);
3109         va_end(ap);
3110 }
3111 #endif /* DEBUG */
3112
3113 /*
3114  * Check options for consistency.
3115  */
3116 int
3117 check_options(struct dirlist *dp)
3118 {
3119
3120         if (v4root_phase == 0 && dp == NULL)
3121             return (1);
3122         if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL)) {
3123             syslog(LOG_ERR, "-mapall and -maproot mutually exclusive");
3124             return (1);
3125         }
3126         if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) {
3127                 syslog(LOG_ERR, "-mask requires -network");
3128                 return (1);
3129         }
3130         if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) {
3131                 syslog(LOG_ERR, "-network requires mask specification");
3132                 return (1);
3133         }
3134         if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) {
3135                 syslog(LOG_ERR, "-mask and /masklen are mutually exclusive");
3136                 return (1);
3137         }
3138         if (v4root_phase > 0 &&
3139             (opt_flags &
3140              ~(OP_SEC | OP_MASK | OP_NET | OP_HAVEMASK | OP_MASKLEN)) != 0) {
3141             syslog(LOG_ERR,"only -sec,-net,-mask options allowed on V4:");
3142             return (1);
3143         }
3144         if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
3145             syslog(LOG_ERR, "-alldirs has multiple directories");
3146             return (1);
3147         }
3148         return (0);
3149 }
3150
3151 /*
3152  * Check an absolute directory path for any symbolic links. Return true
3153  */
3154 int
3155 check_dirpath(char *dirp)
3156 {
3157         char *cp;
3158         int ret = 1;
3159         struct stat sb;
3160
3161         cp = dirp + 1;
3162         while (*cp && ret) {
3163                 if (*cp == '/') {
3164                         *cp = '\0';
3165                         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
3166                                 ret = 0;
3167                         *cp = '/';
3168                 }
3169                 cp++;
3170         }
3171         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
3172                 ret = 0;
3173         return (ret);
3174 }
3175
3176 /*
3177  * Make a netmask according to the specified prefix length. The ss_family
3178  * and other non-address fields must be initialised before calling this.
3179  */
3180 int
3181 makemask(struct sockaddr_storage *ssp, int bitlen)
3182 {
3183         u_char *p;
3184         int bits, i, len;
3185
3186         if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL)
3187                 return (-1);
3188         if (bitlen > len * CHAR_BIT)
3189                 return (-1);
3190
3191         for (i = 0; i < len; i++) {
3192                 bits = (bitlen > CHAR_BIT) ? CHAR_BIT : bitlen;
3193                 *p++ = (u_char)~0 << (CHAR_BIT - bits);
3194                 bitlen -= bits;
3195         }
3196         return 0;
3197 }
3198
3199 /*
3200  * Check that the sockaddr is a valid netmask. Returns 0 if the mask
3201  * is acceptable (i.e. of the form 1...10....0).
3202  */
3203 int
3204 checkmask(struct sockaddr *sa)
3205 {
3206         u_char *mask;
3207         int i, len;
3208
3209         if ((mask = sa_rawaddr(sa, &len)) == NULL)
3210                 return (-1);
3211
3212         for (i = 0; i < len; i++)
3213                 if (mask[i] != 0xff)
3214                         break;
3215         if (i < len) {
3216                 if (~mask[i] & (u_char)(~mask[i] + 1))
3217                         return (-1);
3218                 i++;
3219         }
3220         for (; i < len; i++)
3221                 if (mask[i] != 0)
3222                         return (-1);
3223         return (0);
3224 }
3225
3226 /*
3227  * Compare two sockaddrs according to a specified mask. Return zero if
3228  * `sa1' matches `sa2' when filtered by the netmask in `samask'.
3229  * If samask is NULL, perform a full comparison.
3230  */
3231 int
3232 sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask)
3233 {
3234         unsigned char *p1, *p2, *mask;
3235         int len, i;
3236
3237         if (sa1->sa_family != sa2->sa_family ||
3238             (p1 = sa_rawaddr(sa1, &len)) == NULL ||
3239             (p2 = sa_rawaddr(sa2, NULL)) == NULL)
3240                 return (1);
3241
3242         switch (sa1->sa_family) {
3243         case AF_INET6:
3244                 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
3245                     ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
3246                         return (1);
3247                 break;
3248         }
3249
3250         /* Simple binary comparison if no mask specified. */
3251         if (samask == NULL)
3252                 return (memcmp(p1, p2, len));
3253
3254         /* Set up the mask, and do a mask-based comparison. */
3255         if (sa1->sa_family != samask->sa_family ||
3256             (mask = sa_rawaddr(samask, NULL)) == NULL)
3257                 return (1);
3258
3259         for (i = 0; i < len; i++)
3260                 if ((p1[i] & mask[i]) != (p2[i] & mask[i]))
3261                         return (1);
3262         return (0);
3263 }
3264
3265 /*
3266  * Return a pointer to the part of the sockaddr that contains the
3267  * raw address, and set *nbytes to its length in bytes. Returns
3268  * NULL if the address family is unknown.
3269  */
3270 void *
3271 sa_rawaddr(struct sockaddr *sa, int *nbytes) {
3272         void *p;
3273         int len;
3274
3275         switch (sa->sa_family) {
3276         case AF_INET:
3277                 len = sizeof(((struct sockaddr_in *)sa)->sin_addr);
3278                 p = &((struct sockaddr_in *)sa)->sin_addr;
3279                 break;
3280         case AF_INET6:
3281                 len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr);
3282                 p = &((struct sockaddr_in6 *)sa)->sin6_addr;
3283                 break;
3284         default:
3285                 p = NULL;
3286                 len = 0;
3287         }
3288
3289         if (nbytes != NULL)
3290                 *nbytes = len;
3291         return (p);
3292 }
3293
3294 void
3295 huphandler(int sig __unused)
3296 {
3297         got_sighup = 1;
3298 }
3299
3300 void terminate(int sig __unused)
3301 {
3302         pidfile_remove(pfh);
3303         rpcb_unset(MOUNTPROG, MOUNTVERS, NULL);
3304         rpcb_unset(MOUNTPROG, MOUNTVERS3, NULL);
3305         exit (0);
3306 }
3307