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