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