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                  * Do not delete export for network filesystem by
1736                  * passing "export" arg to nmount().
1737                  * It only makes sense to do this for local filesystems.
1738                  */
1739                 if (vfc.vfc_flags & VFCF_NETWORK)
1740                         continue;
1741
1742                 iov[1].iov_base = fsp->f_fstypename;
1743                 iov[1].iov_len = strlen(fsp->f_fstypename) + 1;
1744                 iov[3].iov_base = fsp->f_mntonname;
1745                 iov[3].iov_len = strlen(fsp->f_mntonname) + 1;
1746                 iov[5].iov_base = fsp->f_mntfromname;
1747                 iov[5].iov_len = strlen(fsp->f_mntfromname) + 1;
1748                 errmsg[0] = '\0';
1749
1750                 /*
1751                  * EXDEV is returned when path exists but is not a
1752                  * mount point.  May happens if raced with unmount.
1753                  */
1754                 if (nmount(iov, iovlen, fsp->f_flags) < 0 &&
1755                     errno != ENOENT && errno != ENOTSUP && errno != EXDEV) {
1756                         syslog(LOG_ERR,
1757                             "can't delete exports for %s: %m %s",
1758                             fsp->f_mntonname, errmsg);
1759                 }
1760         }
1761
1762         if (iov != NULL) {
1763                 /* Free strings allocated by strdup() in getmntopts.c */
1764                 free(iov[0].iov_base); /* fstype */
1765                 free(iov[2].iov_base); /* fspath */
1766                 free(iov[4].iov_base); /* from */
1767                 free(iov[6].iov_base); /* update */
1768                 free(iov[8].iov_base); /* export */
1769                 free(iov[10].iov_base); /* errmsg */
1770
1771                 /* free iov, allocated by realloc() */
1772                 free(iov);
1773                 iovlen = 0;
1774         }
1775
1776         /*
1777          * Read in the exports file and build the list, calling
1778          * nmount() as we go along to push the export rules into the kernel.
1779          */
1780         done = 0;
1781         for (i = 0; exnames[i] != NULL; i++) {
1782                 if (debug)
1783                         warnx("reading exports from %s", exnames[i]);
1784                 if ((exp_file = fopen(exnames[i], "r")) == NULL) {
1785                         syslog(LOG_WARNING, "can't open %s", exnames[i]);
1786                         continue;
1787                 }
1788                 get_exportlist_one();
1789                 fclose(exp_file);
1790                 done++;
1791         }
1792         if (done == 0) {
1793                 syslog(LOG_ERR, "can't open any exports file");
1794                 exit(2);
1795         }
1796
1797         /*
1798          * If there was no public fh, clear any previous one set.
1799          */
1800         if (run_v4server > 0 && has_publicfh == 0)
1801                 (void) nfssvc(NFSSVC_NOPUBLICFH, NULL);
1802
1803         /* Resume the nfsd. If they weren't suspended, this is harmless. */
1804         (void)nfssvc(NFSSVC_RESUMENFSD, NULL);
1805 }
1806
1807 /*
1808  * Allocate an export list element
1809  */
1810 struct exportlist *
1811 get_exp(void)
1812 {
1813         struct exportlist *ep;
1814
1815         ep = (struct exportlist *)calloc(1, sizeof (struct exportlist));
1816         if (ep == (struct exportlist *)NULL)
1817                 out_of_mem();
1818         return (ep);
1819 }
1820
1821 /*
1822  * Allocate a group list element
1823  */
1824 struct grouplist *
1825 get_grp(void)
1826 {
1827         struct grouplist *gp;
1828
1829         gp = (struct grouplist *)calloc(1, sizeof (struct grouplist));
1830         if (gp == (struct grouplist *)NULL)
1831                 out_of_mem();
1832         return (gp);
1833 }
1834
1835 /*
1836  * Clean up upon an error in get_exportlist().
1837  */
1838 void
1839 getexp_err(struct exportlist *ep, struct grouplist *grp)
1840 {
1841         struct grouplist *tgrp;
1842
1843         if (!(opt_flags & OP_QUIET))
1844                 syslog(LOG_ERR, "bad exports list line %s", line);
1845         if (ep && (ep->ex_flag & EX_LINKED) == 0)
1846                 free_exp(ep);
1847         while (grp) {
1848                 tgrp = grp;
1849                 grp = grp->gr_next;
1850                 free_grp(tgrp);
1851         }
1852 }
1853
1854 /*
1855  * Search the export list for a matching fs.
1856  */
1857 struct exportlist *
1858 ex_search(fsid_t *fsid)
1859 {
1860         struct exportlist *ep;
1861
1862         ep = exphead;
1863         while (ep) {
1864                 if (ep->ex_fs.val[0] == fsid->val[0] &&
1865                     ep->ex_fs.val[1] == fsid->val[1])
1866                         return (ep);
1867                 ep = ep->ex_next;
1868         }
1869         return (ep);
1870 }
1871
1872 /*
1873  * Add a directory path to the list.
1874  */
1875 char *
1876 add_expdir(struct dirlist **dpp, char *cp, int len)
1877 {
1878         struct dirlist *dp;
1879
1880         dp = (struct dirlist *)malloc(sizeof (struct dirlist) + len);
1881         if (dp == (struct dirlist *)NULL)
1882                 out_of_mem();
1883         dp->dp_left = *dpp;
1884         dp->dp_right = (struct dirlist *)NULL;
1885         dp->dp_flag = 0;
1886         dp->dp_hosts = (struct hostlist *)NULL;
1887         strcpy(dp->dp_dirp, cp);
1888         *dpp = dp;
1889         return (dp->dp_dirp);
1890 }
1891
1892 /*
1893  * Hang the dir list element off the dirpath binary tree as required
1894  * and update the entry for host.
1895  */
1896 void
1897 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep,
1898         int flags)
1899 {
1900         struct hostlist *hp;
1901         struct dirlist *dp2;
1902
1903         if (flags & OP_ALLDIRS) {
1904                 if (ep->ex_defdir)
1905                         free((caddr_t)dp);
1906                 else
1907                         ep->ex_defdir = dp;
1908                 if (grp == (struct grouplist *)NULL) {
1909                         ep->ex_defdir->dp_flag |= DP_DEFSET;
1910                         /* Save the default security flavors list. */
1911                         ep->ex_defnumsecflavors = ep->ex_numsecflavors;
1912                         if (ep->ex_numsecflavors > 0)
1913                                 memcpy(ep->ex_defsecflavors, ep->ex_secflavors,
1914                                     sizeof(ep->ex_secflavors));
1915                 } else while (grp) {
1916                         hp = get_ht();
1917                         hp->ht_grp = grp;
1918                         hp->ht_next = ep->ex_defdir->dp_hosts;
1919                         ep->ex_defdir->dp_hosts = hp;
1920                         /* Save the security flavors list for this host set. */
1921                         grp->gr_numsecflavors = ep->ex_numsecflavors;
1922                         if (ep->ex_numsecflavors > 0)
1923                                 memcpy(grp->gr_secflavors, ep->ex_secflavors,
1924                                     sizeof(ep->ex_secflavors));
1925                         grp = grp->gr_next;
1926                 }
1927         } else {
1928
1929                 /*
1930                  * Loop through the directories adding them to the tree.
1931                  */
1932                 while (dp) {
1933                         dp2 = dp->dp_left;
1934                         add_dlist(&ep->ex_dirl, dp, grp, flags, ep);
1935                         dp = dp2;
1936                 }
1937         }
1938 }
1939
1940 /*
1941  * Traverse the binary tree either updating a node that is already there
1942  * for the new directory or adding the new node.
1943  */
1944 void
1945 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp,
1946         int flags, struct exportlist *ep)
1947 {
1948         struct dirlist *dp;
1949         struct hostlist *hp;
1950         int cmp;
1951
1952         dp = *dpp;
1953         if (dp) {
1954                 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp);
1955                 if (cmp > 0) {
1956                         add_dlist(&dp->dp_left, newdp, grp, flags, ep);
1957                         return;
1958                 } else if (cmp < 0) {
1959                         add_dlist(&dp->dp_right, newdp, grp, flags, ep);
1960                         return;
1961                 } else
1962                         free((caddr_t)newdp);
1963         } else {
1964                 dp = newdp;
1965                 dp->dp_left = (struct dirlist *)NULL;
1966                 *dpp = dp;
1967         }
1968         if (grp) {
1969
1970                 /*
1971                  * Hang all of the host(s) off of the directory point.
1972                  */
1973                 do {
1974                         hp = get_ht();
1975                         hp->ht_grp = grp;
1976                         hp->ht_next = dp->dp_hosts;
1977                         dp->dp_hosts = hp;
1978                         /* Save the security flavors list for this host set. */
1979                         grp->gr_numsecflavors = ep->ex_numsecflavors;
1980                         if (ep->ex_numsecflavors > 0)
1981                                 memcpy(grp->gr_secflavors, ep->ex_secflavors,
1982                                     sizeof(ep->ex_secflavors));
1983                         grp = grp->gr_next;
1984                 } while (grp);
1985         } else {
1986                 dp->dp_flag |= DP_DEFSET;
1987                 /* Save the default security flavors list. */
1988                 ep->ex_defnumsecflavors = ep->ex_numsecflavors;
1989                 if (ep->ex_numsecflavors > 0)
1990                         memcpy(ep->ex_defsecflavors, ep->ex_secflavors,
1991                             sizeof(ep->ex_secflavors));
1992         }
1993 }
1994
1995 /*
1996  * Search for a dirpath on the export point.
1997  */
1998 struct dirlist *
1999 dirp_search(struct dirlist *dp, char *dirp)
2000 {
2001         int cmp;
2002
2003         if (dp) {
2004                 cmp = strcmp(dp->dp_dirp, dirp);
2005                 if (cmp > 0)
2006                         return (dirp_search(dp->dp_left, dirp));
2007                 else if (cmp < 0)
2008                         return (dirp_search(dp->dp_right, dirp));
2009                 else
2010                         return (dp);
2011         }
2012         return (dp);
2013 }
2014
2015 /*
2016  * Scan for a host match in a directory tree.
2017  */
2018 int
2019 chk_host(struct dirlist *dp, struct sockaddr *saddr, int *defsetp,
2020         int *hostsetp, int *numsecflavors, int **secflavorsp)
2021 {
2022         struct hostlist *hp;
2023         struct grouplist *grp;
2024         struct addrinfo *ai;
2025
2026         if (dp) {
2027                 if (dp->dp_flag & DP_DEFSET)
2028                         *defsetp = dp->dp_flag;
2029                 hp = dp->dp_hosts;
2030                 while (hp) {
2031                         grp = hp->ht_grp;
2032                         switch (grp->gr_type) {
2033                         case GT_HOST:
2034                                 ai = grp->gr_ptr.gt_addrinfo;
2035                                 for (; ai; ai = ai->ai_next) {
2036                                         if (!sacmp(ai->ai_addr, saddr, NULL)) {
2037                                                 *hostsetp =
2038                                                     (hp->ht_flag | DP_HOSTSET);
2039                                                 if (numsecflavors != NULL) {
2040                                                         *numsecflavors =
2041                                                             grp->gr_numsecflavors;
2042                                                         *secflavorsp =
2043                                                             grp->gr_secflavors;
2044                                                 }
2045                                                 return (1);
2046                                         }
2047                                 }
2048                                 break;
2049                         case GT_NET:
2050                                 if (!sacmp(saddr, (struct sockaddr *)
2051                                     &grp->gr_ptr.gt_net.nt_net,
2052                                     (struct sockaddr *)
2053                                     &grp->gr_ptr.gt_net.nt_mask)) {
2054                                         *hostsetp = (hp->ht_flag | DP_HOSTSET);
2055                                         if (numsecflavors != NULL) {
2056                                                 *numsecflavors =
2057                                                     grp->gr_numsecflavors;
2058                                                 *secflavorsp =
2059                                                     grp->gr_secflavors;
2060                                         }
2061                                         return (1);
2062                                 }
2063                                 break;
2064                         }
2065                         hp = hp->ht_next;
2066                 }
2067         }
2068         return (0);
2069 }
2070
2071 /*
2072  * Scan tree for a host that matches the address.
2073  */
2074 int
2075 scan_tree(struct dirlist *dp, struct sockaddr *saddr)
2076 {
2077         int defset, hostset;
2078
2079         if (dp) {
2080                 if (scan_tree(dp->dp_left, saddr))
2081                         return (1);
2082                 if (chk_host(dp, saddr, &defset, &hostset, NULL, NULL))
2083                         return (1);
2084                 if (scan_tree(dp->dp_right, saddr))
2085                         return (1);
2086         }
2087         return (0);
2088 }
2089
2090 /*
2091  * Traverse the dirlist tree and free it up.
2092  */
2093 void
2094 free_dir(struct dirlist *dp)
2095 {
2096
2097         if (dp) {
2098                 free_dir(dp->dp_left);
2099                 free_dir(dp->dp_right);
2100                 free_host(dp->dp_hosts);
2101                 free((caddr_t)dp);
2102         }
2103 }
2104
2105 /*
2106  * Parse a colon separated list of security flavors
2107  */
2108 int
2109 parsesec(char *seclist, struct exportlist *ep)
2110 {
2111         char *cp, savedc;
2112         int flavor;
2113
2114         ep->ex_numsecflavors = 0;
2115         for (;;) {
2116                 cp = strchr(seclist, ':');
2117                 if (cp) {
2118                         savedc = *cp;
2119                         *cp = '\0';
2120                 }
2121
2122                 if (!strcmp(seclist, "sys"))
2123                         flavor = AUTH_SYS;
2124                 else if (!strcmp(seclist, "krb5"))
2125                         flavor = RPCSEC_GSS_KRB5;
2126                 else if (!strcmp(seclist, "krb5i"))
2127                         flavor = RPCSEC_GSS_KRB5I;
2128                 else if (!strcmp(seclist, "krb5p"))
2129                         flavor = RPCSEC_GSS_KRB5P;
2130                 else {
2131                         if (cp)
2132                                 *cp = savedc;
2133                         syslog(LOG_ERR, "bad sec flavor: %s", seclist);
2134                         return (1);
2135                 }
2136                 if (ep->ex_numsecflavors == MAXSECFLAVORS) {
2137                         if (cp)
2138                                 *cp = savedc;
2139                         syslog(LOG_ERR, "too many sec flavors: %s", seclist);
2140                         return (1);
2141                 }
2142                 ep->ex_secflavors[ep->ex_numsecflavors] = flavor;
2143                 ep->ex_numsecflavors++;
2144                 if (cp) {
2145                         *cp = savedc;
2146                         seclist = cp + 1;
2147                 } else {
2148                         break;
2149                 }
2150         }
2151         return (0);
2152 }
2153
2154 /*
2155  * Parse the option string and update fields.
2156  * Option arguments may either be -<option>=<value> or
2157  * -<option> <value>
2158  */
2159 int
2160 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp,
2161         int *has_hostp, int *exflagsp, struct xucred *cr)
2162 {
2163         char *cpoptarg, *cpoptend;
2164         char *cp, *endcp, *cpopt, savedc, savedc2;
2165         int allflag, usedarg;
2166
2167         savedc2 = '\0';
2168         cpopt = *cpp;
2169         cpopt++;
2170         cp = *endcpp;
2171         savedc = *cp;
2172         *cp = '\0';
2173         while (cpopt && *cpopt) {
2174                 allflag = 1;
2175                 usedarg = -2;
2176                 if ((cpoptend = strchr(cpopt, ','))) {
2177                         *cpoptend++ = '\0';
2178                         if ((cpoptarg = strchr(cpopt, '=')))
2179                                 *cpoptarg++ = '\0';
2180                 } else {
2181                         if ((cpoptarg = strchr(cpopt, '=')))
2182                                 *cpoptarg++ = '\0';
2183                         else {
2184                                 *cp = savedc;
2185                                 nextfield(&cp, &endcp);
2186                                 **endcpp = '\0';
2187                                 if (endcp > cp && *cp != '-') {
2188                                         cpoptarg = cp;
2189                                         savedc2 = *endcp;
2190                                         *endcp = '\0';
2191                                         usedarg = 0;
2192                                 }
2193                         }
2194                 }
2195                 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) {
2196                         *exflagsp |= MNT_EXRDONLY;
2197                 } else if (cpoptarg && (!strcmp(cpopt, "maproot") ||
2198                     !(allflag = strcmp(cpopt, "mapall")) ||
2199                     !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) {
2200                         usedarg++;
2201                         parsecred(cpoptarg, cr);
2202                         if (allflag == 0) {
2203                                 *exflagsp |= MNT_EXPORTANON;
2204                                 opt_flags |= OP_MAPALL;
2205                         } else
2206                                 opt_flags |= OP_MAPROOT;
2207                 } else if (cpoptarg && (!strcmp(cpopt, "mask") ||
2208                     !strcmp(cpopt, "m"))) {
2209                         if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) {
2210                                 syslog(LOG_ERR, "bad mask: %s", cpoptarg);
2211                                 return (1);
2212                         }
2213                         usedarg++;
2214                         opt_flags |= OP_MASK;
2215                 } else if (cpoptarg && (!strcmp(cpopt, "network") ||
2216                         !strcmp(cpopt, "n"))) {
2217                         if (strchr(cpoptarg, '/') != NULL) {
2218                                 if (debug)
2219                                         fprintf(stderr, "setting OP_MASKLEN\n");
2220                                 opt_flags |= OP_MASKLEN;
2221                         }
2222                         if (grp->gr_type != GT_NULL) {
2223                                 syslog(LOG_ERR, "network/host conflict");
2224                                 return (1);
2225                         } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) {
2226                                 syslog(LOG_ERR, "bad net: %s", cpoptarg);
2227                                 return (1);
2228                         }
2229                         grp->gr_type = GT_NET;
2230                         *has_hostp = 1;
2231                         usedarg++;
2232                         opt_flags |= OP_NET;
2233                 } else if (!strcmp(cpopt, "alldirs")) {
2234                         opt_flags |= OP_ALLDIRS;
2235                 } else if (!strcmp(cpopt, "public")) {
2236                         *exflagsp |= MNT_EXPUBLIC;
2237                 } else if (!strcmp(cpopt, "webnfs")) {
2238                         *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON);
2239                         opt_flags |= OP_MAPALL;
2240                 } else if (cpoptarg && !strcmp(cpopt, "index")) {
2241                         ep->ex_indexfile = strdup(cpoptarg);
2242                 } else if (!strcmp(cpopt, "quiet")) {
2243                         opt_flags |= OP_QUIET;
2244                 } else if (cpoptarg && !strcmp(cpopt, "sec")) {
2245                         if (parsesec(cpoptarg, ep))
2246                                 return (1);
2247                         opt_flags |= OP_SEC;
2248                         usedarg++;
2249                 } else {
2250                         syslog(LOG_ERR, "bad opt %s", cpopt);
2251                         return (1);
2252                 }
2253                 if (usedarg >= 0) {
2254                         *endcp = savedc2;
2255                         **endcpp = savedc;
2256                         if (usedarg > 0) {
2257                                 *cpp = cp;
2258                                 *endcpp = endcp;
2259                         }
2260                         return (0);
2261                 }
2262                 cpopt = cpoptend;
2263         }
2264         **endcpp = savedc;
2265         return (0);
2266 }
2267
2268 /*
2269  * Translate a character string to the corresponding list of network
2270  * addresses for a hostname.
2271  */
2272 int
2273 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp)
2274 {
2275         struct grouplist *checkgrp;
2276         struct addrinfo *ai, *tai, hints;
2277         int ecode;
2278         char host[NI_MAXHOST];
2279
2280         if (grp->gr_type != GT_NULL) {
2281                 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp);
2282                 return (1);
2283         }
2284         memset(&hints, 0, sizeof hints);
2285         hints.ai_flags = AI_CANONNAME;
2286         hints.ai_protocol = IPPROTO_UDP;
2287         ecode = getaddrinfo(cp, NULL, &hints, &ai);
2288         if (ecode != 0) {
2289                 syslog(LOG_ERR,"can't get address info for host %s", cp);
2290                 return 1;
2291         }
2292         grp->gr_ptr.gt_addrinfo = ai;
2293         while (ai != NULL) {
2294                 if (ai->ai_canonname == NULL) {
2295                         if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host,
2296                             sizeof host, NULL, 0, NI_NUMERICHOST) != 0)
2297                                 strlcpy(host, "?", sizeof(host));
2298                         ai->ai_canonname = strdup(host);
2299                         ai->ai_flags |= AI_CANONNAME;
2300                 }
2301                 if (debug)
2302                         fprintf(stderr, "got host %s\n", ai->ai_canonname);
2303                 /*
2304                  * Sanity check: make sure we don't already have an entry
2305                  * for this host in the grouplist.
2306                  */
2307                 for (checkgrp = tgrp; checkgrp != NULL;
2308                     checkgrp = checkgrp->gr_next) {
2309                         if (checkgrp->gr_type != GT_HOST)
2310                                 continue;
2311                         for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL;
2312                             tai = tai->ai_next) {
2313                                 if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0)
2314                                         continue;
2315                                 if (debug)
2316                                         fprintf(stderr,
2317                                             "ignoring duplicate host %s\n",
2318                                             ai->ai_canonname);
2319                                 grp->gr_type = GT_IGNORE;
2320                                 return (0);
2321                         }
2322                 }
2323                 ai = ai->ai_next;
2324         }
2325         grp->gr_type = GT_HOST;
2326         return (0);
2327 }
2328
2329 /*
2330  * Free up an exports list component
2331  */
2332 void
2333 free_exp(struct exportlist *ep)
2334 {
2335
2336         if (ep->ex_defdir) {
2337                 free_host(ep->ex_defdir->dp_hosts);
2338                 free((caddr_t)ep->ex_defdir);
2339         }
2340         if (ep->ex_fsdir)
2341                 free(ep->ex_fsdir);
2342         if (ep->ex_indexfile)
2343                 free(ep->ex_indexfile);
2344         free_dir(ep->ex_dirl);
2345         free((caddr_t)ep);
2346 }
2347
2348 /*
2349  * Free hosts.
2350  */
2351 void
2352 free_host(struct hostlist *hp)
2353 {
2354         struct hostlist *hp2;
2355
2356         while (hp) {
2357                 hp2 = hp;
2358                 hp = hp->ht_next;
2359                 free((caddr_t)hp2);
2360         }
2361 }
2362
2363 struct hostlist *
2364 get_ht(void)
2365 {
2366         struct hostlist *hp;
2367
2368         hp = (struct hostlist *)malloc(sizeof (struct hostlist));
2369         if (hp == (struct hostlist *)NULL)
2370                 out_of_mem();
2371         hp->ht_next = (struct hostlist *)NULL;
2372         hp->ht_flag = 0;
2373         return (hp);
2374 }
2375
2376 /*
2377  * Out of memory, fatal
2378  */
2379 void
2380 out_of_mem(void)
2381 {
2382
2383         syslog(LOG_ERR, "out of memory");
2384         exit(2);
2385 }
2386
2387 /*
2388  * Do the nmount() syscall with the update flag to push the export info into
2389  * the kernel.
2390  */
2391 int
2392 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags,
2393     struct xucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb)
2394 {
2395         struct statfs fsb1;
2396         struct addrinfo *ai;
2397         struct export_args ea, *eap;
2398         char errmsg[255];
2399         char *cp;
2400         int done;
2401         char savedc;
2402         struct iovec *iov;
2403         int i, iovlen;
2404         int ret;
2405         struct nfsex_args nfsea;
2406
2407         if (run_v4server > 0)
2408                 eap = &nfsea.export;
2409         else
2410                 eap = &ea;
2411
2412         cp = NULL;
2413         savedc = '\0';
2414         iov = NULL;
2415         iovlen = 0;
2416         ret = 0;
2417
2418         bzero(eap, sizeof (struct export_args));
2419         bzero(errmsg, sizeof(errmsg));
2420         eap->ex_flags = exflags;
2421         eap->ex_anon = *anoncrp;
2422         eap->ex_indexfile = ep->ex_indexfile;
2423         if (grp->gr_type == GT_HOST)
2424                 ai = grp->gr_ptr.gt_addrinfo;
2425         else
2426                 ai = NULL;
2427         eap->ex_numsecflavors = ep->ex_numsecflavors;
2428         for (i = 0; i < eap->ex_numsecflavors; i++)
2429                 eap->ex_secflavors[i] = ep->ex_secflavors[i];
2430         if (eap->ex_numsecflavors == 0) {
2431                 eap->ex_numsecflavors = 1;
2432                 eap->ex_secflavors[0] = AUTH_SYS;
2433         }
2434         done = FALSE;
2435
2436         if (v4root_phase == 0) {
2437                 build_iovec(&iov, &iovlen, "fstype", NULL, 0);
2438                 build_iovec(&iov, &iovlen, "fspath", NULL, 0);
2439                 build_iovec(&iov, &iovlen, "from", NULL, 0);
2440                 build_iovec(&iov, &iovlen, "update", NULL, 0);
2441                 build_iovec(&iov, &iovlen, "export", eap,
2442                     sizeof (struct export_args));
2443                 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
2444         }
2445
2446         while (!done) {
2447                 switch (grp->gr_type) {
2448                 case GT_HOST:
2449                         if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0)
2450                                 goto skip;
2451                         eap->ex_addr = ai->ai_addr;
2452                         eap->ex_addrlen = ai->ai_addrlen;
2453                         eap->ex_masklen = 0;
2454                         break;
2455                 case GT_NET:
2456                         if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 &&
2457                             have_v6 == 0)
2458                                 goto skip;
2459                         eap->ex_addr =
2460                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net;
2461                         eap->ex_addrlen =
2462                             ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_net)->sa_len;
2463                         eap->ex_mask =
2464                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask;
2465                         eap->ex_masklen = ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask)->sa_len;
2466                         break;
2467                 case GT_DEFAULT:
2468                         eap->ex_addr = NULL;
2469                         eap->ex_addrlen = 0;
2470                         eap->ex_mask = NULL;
2471                         eap->ex_masklen = 0;
2472                         break;
2473                 case GT_IGNORE:
2474                         ret = 0;
2475                         goto error_exit;
2476                         break;
2477                 default:
2478                         syslog(LOG_ERR, "bad grouptype");
2479                         if (cp)
2480                                 *cp = savedc;
2481                         ret = 1;
2482                         goto error_exit;
2483                 };
2484
2485                 /*
2486                  * For V4:, use the nfssvc() syscall, instead of mount().
2487                  */
2488                 if (v4root_phase == 2) {
2489                         nfsea.fspec = v4root_dirpath;
2490                         if (run_v4server > 0 &&
2491                             nfssvc(NFSSVC_V4ROOTEXPORT, (caddr_t)&nfsea) < 0) {
2492                                 syslog(LOG_ERR, "Exporting V4: failed");
2493                                 return (2);
2494                         }
2495                 } else {
2496                         /*
2497                          * XXX:
2498                          * Maybe I should just use the fsb->f_mntonname path
2499                          * instead of looping back up the dirp to the mount
2500                          * point??
2501                          * Also, needs to know how to export all types of local
2502                          * exportable filesystems and not just "ufs".
2503                          */
2504                         iov[1].iov_base = fsb->f_fstypename; /* "fstype" */
2505                         iov[1].iov_len = strlen(fsb->f_fstypename) + 1;
2506                         iov[3].iov_base = fsb->f_mntonname; /* "fspath" */
2507                         iov[3].iov_len = strlen(fsb->f_mntonname) + 1;
2508                         iov[5].iov_base = fsb->f_mntfromname; /* "from" */
2509                         iov[5].iov_len = strlen(fsb->f_mntfromname) + 1;
2510                         errmsg[0] = '\0';
2511
2512                         while (nmount(iov, iovlen, fsb->f_flags) < 0) {
2513                                 if (cp)
2514                                         *cp-- = savedc;
2515                                 else
2516                                         cp = dirp + dirplen - 1;
2517                                 if (opt_flags & OP_QUIET) {
2518                                         ret = 1;
2519                                         goto error_exit;
2520                                 }
2521                                 if (errno == EPERM) {
2522                                         if (debug)
2523                                                 warnx("can't change attributes for %s: %s",
2524                                                     dirp, errmsg);
2525                                         syslog(LOG_ERR,
2526                                            "can't change attributes for %s: %s",
2527                                             dirp, errmsg);
2528                                         ret = 1;
2529                                         goto error_exit;
2530                                 }
2531                                 if (opt_flags & OP_ALLDIRS) {
2532                                         if (errno == EINVAL)
2533                                                 syslog(LOG_ERR,
2534                 "-alldirs requested but %s is not a filesystem mountpoint",
2535                                                     dirp);
2536                                         else
2537                                                 syslog(LOG_ERR,
2538                                                     "could not remount %s: %m",
2539                                                     dirp);
2540                                         ret = 1;
2541                                         goto error_exit;
2542                                 }
2543                                 /* back up over the last component */
2544                                 while (*cp == '/' && cp > dirp)
2545                                         cp--;
2546                                 while (*(cp - 1) != '/' && cp > dirp)
2547                                         cp--;
2548                                 if (cp == dirp) {
2549                                         if (debug)
2550                                                 warnx("mnt unsucc");
2551                                         syslog(LOG_ERR, "can't export %s %s",
2552                                             dirp, errmsg);
2553                                         ret = 1;
2554                                         goto error_exit;
2555                                 }
2556                                 savedc = *cp;
2557                                 *cp = '\0';
2558                                 /*
2559                                  * Check that we're still on the same
2560                                  * filesystem.
2561                                  */
2562                                 if (statfs(dirp, &fsb1) != 0 ||
2563                                     bcmp(&fsb1.f_fsid, &fsb->f_fsid,
2564                                     sizeof (fsb1.f_fsid)) != 0) {
2565                                         *cp = savedc;
2566                                         syslog(LOG_ERR,
2567                                             "can't export %s %s", dirp,
2568                                             errmsg);
2569                                         ret = 1;
2570                                         goto error_exit;
2571                                 }
2572                         }
2573                 }
2574
2575                 /*
2576                  * For the experimental server:
2577                  * If this is the public directory, get the file handle
2578                  * and load it into the kernel via the nfssvc() syscall.
2579                  */
2580                 if (run_v4server > 0 && (exflags & MNT_EXPUBLIC) != 0) {
2581                         fhandle_t fh;
2582                         char *public_name;
2583
2584                         if (eap->ex_indexfile != NULL)
2585                                 public_name = eap->ex_indexfile;
2586                         else
2587                                 public_name = dirp;
2588                         if (getfh(public_name, &fh) < 0)
2589                                 syslog(LOG_ERR,
2590                                     "Can't get public fh for %s", public_name);
2591                         else if (nfssvc(NFSSVC_PUBLICFH, (caddr_t)&fh) < 0)
2592                                 syslog(LOG_ERR,
2593                                     "Can't set public fh for %s", public_name);
2594                         else
2595                                 has_publicfh = 1;
2596                 }
2597 skip:
2598                 if (ai != NULL)
2599                         ai = ai->ai_next;
2600                 if (ai == NULL)
2601                         done = TRUE;
2602         }
2603         if (cp)
2604                 *cp = savedc;
2605 error_exit:
2606         /* free strings allocated by strdup() in getmntopts.c */
2607         if (iov != NULL) {
2608                 free(iov[0].iov_base); /* fstype */
2609                 free(iov[2].iov_base); /* fspath */
2610                 free(iov[4].iov_base); /* from */
2611                 free(iov[6].iov_base); /* update */
2612                 free(iov[8].iov_base); /* export */
2613                 free(iov[10].iov_base); /* errmsg */
2614
2615                 /* free iov, allocated by realloc() */
2616                 free(iov);
2617         }
2618         return (ret);
2619 }
2620
2621 /*
2622  * Translate a net address.
2623  *
2624  * If `maskflg' is nonzero, then `cp' is a netmask, not a network address.
2625  */
2626 int
2627 get_net(char *cp, struct netmsk *net, int maskflg)
2628 {
2629         struct netent *np = NULL;
2630         char *name, *p, *prefp;
2631         struct sockaddr_in sin;
2632         struct sockaddr *sa = NULL;
2633         struct addrinfo hints, *ai = NULL;
2634         char netname[NI_MAXHOST];
2635         long preflen;
2636
2637         p = prefp = NULL;
2638         if ((opt_flags & OP_MASKLEN) && !maskflg) {
2639                 p = strchr(cp, '/');
2640                 *p = '\0';
2641                 prefp = p + 1;
2642         }
2643
2644         /*
2645          * Check for a numeric address first. We wish to avoid
2646          * possible DNS lookups in getnetbyname().
2647          */
2648         if (isxdigit(*cp) || *cp == ':') {
2649                 memset(&hints, 0, sizeof hints);
2650                 /* Ensure the mask and the network have the same family. */
2651                 if (maskflg && (opt_flags & OP_NET))
2652                         hints.ai_family = net->nt_net.ss_family;
2653                 else if (!maskflg && (opt_flags & OP_HAVEMASK))
2654                         hints.ai_family = net->nt_mask.ss_family;
2655                 else
2656                         hints.ai_family = AF_UNSPEC;
2657                 hints.ai_flags = AI_NUMERICHOST;
2658                 if (getaddrinfo(cp, NULL, &hints, &ai) == 0)
2659                         sa = ai->ai_addr;
2660                 if (sa != NULL && ai->ai_family == AF_INET) {
2661                         /*
2662                          * The address in `cp' is really a network address, so
2663                          * use inet_network() to re-interpret this correctly.
2664                          * e.g. "127.1" means 127.1.0.0, not 127.0.0.1.
2665                          */
2666                         bzero(&sin, sizeof sin);
2667                         sin.sin_family = AF_INET;
2668                         sin.sin_len = sizeof sin;
2669                         sin.sin_addr = inet_makeaddr(inet_network(cp), 0);
2670                         if (debug)
2671                                 fprintf(stderr, "get_net: v4 addr %s\n",
2672                                     inet_ntoa(sin.sin_addr));
2673                         sa = (struct sockaddr *)&sin;
2674                 }
2675         }
2676         if (sa == NULL && (np = getnetbyname(cp)) != NULL) {
2677                 bzero(&sin, sizeof sin);
2678                 sin.sin_family = AF_INET;
2679                 sin.sin_len = sizeof sin;
2680                 sin.sin_addr = inet_makeaddr(np->n_net, 0);
2681                 sa = (struct sockaddr *)&sin;
2682         }
2683         if (sa == NULL)
2684                 goto fail;
2685
2686         if (maskflg) {
2687                 /* The specified sockaddr is a mask. */
2688                 if (checkmask(sa) != 0)
2689                         goto fail;
2690                 bcopy(sa, &net->nt_mask, sa->sa_len);
2691                 opt_flags |= OP_HAVEMASK;
2692         } else {
2693                 /* The specified sockaddr is a network address. */
2694                 bcopy(sa, &net->nt_net, sa->sa_len);
2695
2696                 /* Get a network name for the export list. */
2697                 if (np) {
2698                         name = np->n_name;
2699                 } else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname,
2700                    NULL, 0, NI_NUMERICHOST) == 0) {
2701                         name = netname;
2702                 } else {
2703                         goto fail;
2704                 }
2705                 if ((net->nt_name = strdup(name)) == NULL)
2706                         out_of_mem();
2707
2708                 /*
2709                  * Extract a mask from either a "/<masklen>" suffix, or
2710                  * from the class of an IPv4 address.
2711                  */
2712                 if (opt_flags & OP_MASKLEN) {
2713                         preflen = strtol(prefp, NULL, 10);
2714                         if (preflen < 0L || preflen == LONG_MAX)
2715                                 goto fail;
2716                         bcopy(sa, &net->nt_mask, sa->sa_len);
2717                         if (makemask(&net->nt_mask, (int)preflen) != 0)
2718                                 goto fail;
2719                         opt_flags |= OP_HAVEMASK;
2720                         *p = '/';
2721                 } else if (sa->sa_family == AF_INET &&
2722                     (opt_flags & OP_MASK) == 0) {
2723                         in_addr_t addr;
2724
2725                         addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
2726                         if (IN_CLASSA(addr))
2727                                 preflen = 8;
2728                         else if (IN_CLASSB(addr))
2729                                 preflen = 16;
2730                         else if (IN_CLASSC(addr))
2731                                 preflen = 24;
2732                         else if (IN_CLASSD(addr))
2733                                 preflen = 28;
2734                         else
2735                                 preflen = 32;   /* XXX */
2736
2737                         bcopy(sa, &net->nt_mask, sa->sa_len);
2738                         makemask(&net->nt_mask, (int)preflen);
2739                         opt_flags |= OP_HAVEMASK;
2740                 }
2741         }
2742
2743         if (ai)
2744                 freeaddrinfo(ai);
2745         return 0;
2746
2747 fail:
2748         if (ai)
2749                 freeaddrinfo(ai);
2750         return 1;
2751 }
2752
2753 /*
2754  * Parse out the next white space separated field
2755  */
2756 void
2757 nextfield(char **cp, char **endcp)
2758 {
2759         char *p;
2760
2761         p = *cp;
2762         while (*p == ' ' || *p == '\t')
2763                 p++;
2764         if (*p == '\n' || *p == '\0')
2765                 *cp = *endcp = p;
2766         else {
2767                 *cp = p++;
2768                 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
2769                         p++;
2770                 *endcp = p;
2771         }
2772 }
2773
2774 /*
2775  * Get an exports file line. Skip over blank lines and handle line
2776  * continuations.
2777  */
2778 int
2779 get_line(void)
2780 {
2781         char *p, *cp;
2782         size_t len;
2783         int totlen, cont_line;
2784
2785         /*
2786          * Loop around ignoring blank lines and getting all continuation lines.
2787          */
2788         p = line;
2789         totlen = 0;
2790         do {
2791                 if ((p = fgetln(exp_file, &len)) == NULL)
2792                         return (0);
2793                 cp = p + len - 1;
2794                 cont_line = 0;
2795                 while (cp >= p &&
2796                     (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) {
2797                         if (*cp == '\\')
2798                                 cont_line = 1;
2799                         cp--;
2800                         len--;
2801                 }
2802                 if (cont_line) {
2803                         *++cp = ' ';
2804                         len++;
2805                 }
2806                 if (linesize < len + totlen + 1) {
2807                         linesize = len + totlen + 1;
2808                         line = realloc(line, linesize);
2809                         if (line == NULL)
2810                                 out_of_mem();
2811                 }
2812                 memcpy(line + totlen, p, len);
2813                 totlen += len;
2814                 line[totlen] = '\0';
2815         } while (totlen == 0 || cont_line);
2816         return (1);
2817 }
2818
2819 /*
2820  * Parse a description of a credential.
2821  */
2822 void
2823 parsecred(char *namelist, struct xucred *cr)
2824 {
2825         char *name;
2826         int cnt;
2827         char *names;
2828         struct passwd *pw;
2829         struct group *gr;
2830         gid_t groups[XU_NGROUPS + 1];
2831         int ngroups;
2832
2833         cr->cr_version = XUCRED_VERSION;
2834         /*
2835          * Set up the unprivileged user.
2836          */
2837         cr->cr_uid = -2;
2838         cr->cr_groups[0] = -2;
2839         cr->cr_ngroups = 1;
2840         /*
2841          * Get the user's password table entry.
2842          */
2843         names = strsep(&namelist, " \t\n");
2844         name = strsep(&names, ":");
2845         if (isdigit(*name) || *name == '-')
2846                 pw = getpwuid(atoi(name));
2847         else
2848                 pw = getpwnam(name);
2849         /*
2850          * Credentials specified as those of a user.
2851          */
2852         if (names == NULL) {
2853                 if (pw == NULL) {
2854                         syslog(LOG_ERR, "unknown user: %s", name);
2855                         return;
2856                 }
2857                 cr->cr_uid = pw->pw_uid;
2858                 ngroups = XU_NGROUPS + 1;
2859                 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups))
2860                         syslog(LOG_ERR, "too many groups");
2861                 /*
2862                  * Compress out duplicate.
2863                  */
2864                 cr->cr_ngroups = ngroups - 1;
2865                 cr->cr_groups[0] = groups[0];
2866                 for (cnt = 2; cnt < ngroups; cnt++)
2867                         cr->cr_groups[cnt - 1] = groups[cnt];
2868                 return;
2869         }
2870         /*
2871          * Explicit credential specified as a colon separated list:
2872          *      uid:gid:gid:...
2873          */
2874         if (pw != NULL)
2875                 cr->cr_uid = pw->pw_uid;
2876         else if (isdigit(*name) || *name == '-')
2877                 cr->cr_uid = atoi(name);
2878         else {
2879                 syslog(LOG_ERR, "unknown user: %s", name);
2880                 return;
2881         }
2882         cr->cr_ngroups = 0;
2883         while (names != NULL && *names != '\0' && cr->cr_ngroups < XU_NGROUPS) {
2884                 name = strsep(&names, ":");
2885                 if (isdigit(*name) || *name == '-') {
2886                         cr->cr_groups[cr->cr_ngroups++] = atoi(name);
2887                 } else {
2888                         if ((gr = getgrnam(name)) == NULL) {
2889                                 syslog(LOG_ERR, "unknown group: %s", name);
2890                                 continue;
2891                         }
2892                         cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid;
2893                 }
2894         }
2895         if (names != NULL && *names != '\0' && cr->cr_ngroups == XU_NGROUPS)
2896                 syslog(LOG_ERR, "too many groups");
2897 }
2898
2899 #define STRSIZ  (MNTNAMLEN+MNTPATHLEN+50)
2900 /*
2901  * Routines that maintain the remote mounttab
2902  */
2903 void
2904 get_mountlist(void)
2905 {
2906         struct mountlist *mlp, **mlpp;
2907         char *host, *dirp, *cp;
2908         char str[STRSIZ];
2909         FILE *mlfile;
2910
2911         if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) {
2912                 if (errno == ENOENT)
2913                         return;
2914                 else {
2915                         syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST);
2916                         return;
2917                 }
2918         }
2919         mlpp = &mlhead;
2920         while (fgets(str, STRSIZ, mlfile) != NULL) {
2921                 cp = str;
2922                 host = strsep(&cp, " \t\n");
2923                 dirp = strsep(&cp, " \t\n");
2924                 if (host == NULL || dirp == NULL)
2925                         continue;
2926                 mlp = (struct mountlist *)malloc(sizeof (*mlp));
2927                 if (mlp == (struct mountlist *)NULL)
2928                         out_of_mem();
2929                 strncpy(mlp->ml_host, host, MNTNAMLEN);
2930                 mlp->ml_host[MNTNAMLEN] = '\0';
2931                 strncpy(mlp->ml_dirp, dirp, MNTPATHLEN);
2932                 mlp->ml_dirp[MNTPATHLEN] = '\0';
2933                 mlp->ml_next = (struct mountlist *)NULL;
2934                 *mlpp = mlp;
2935                 mlpp = &mlp->ml_next;
2936         }
2937         fclose(mlfile);
2938 }
2939
2940 void
2941 del_mlist(char *hostp, char *dirp)
2942 {
2943         struct mountlist *mlp, **mlpp;
2944         struct mountlist *mlp2;
2945         FILE *mlfile;
2946         int fnd = 0;
2947
2948         mlpp = &mlhead;
2949         mlp = mlhead;
2950         while (mlp) {
2951                 if (!strcmp(mlp->ml_host, hostp) &&
2952                     (!dirp || !strcmp(mlp->ml_dirp, dirp))) {
2953                         fnd = 1;
2954                         mlp2 = mlp;
2955                         *mlpp = mlp = mlp->ml_next;
2956                         free((caddr_t)mlp2);
2957                 } else {
2958                         mlpp = &mlp->ml_next;
2959                         mlp = mlp->ml_next;
2960                 }
2961         }
2962         if (fnd) {
2963                 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) {
2964                         syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST);
2965                         return;
2966                 }
2967                 mlp = mlhead;
2968                 while (mlp) {
2969                         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
2970                         mlp = mlp->ml_next;
2971                 }
2972                 fclose(mlfile);
2973         }
2974 }
2975
2976 void
2977 add_mlist(char *hostp, char *dirp)
2978 {
2979         struct mountlist *mlp, **mlpp;
2980         FILE *mlfile;
2981
2982         mlpp = &mlhead;
2983         mlp = mlhead;
2984         while (mlp) {
2985                 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp))
2986                         return;
2987                 mlpp = &mlp->ml_next;
2988                 mlp = mlp->ml_next;
2989         }
2990         mlp = (struct mountlist *)malloc(sizeof (*mlp));
2991         if (mlp == (struct mountlist *)NULL)
2992                 out_of_mem();
2993         strncpy(mlp->ml_host, hostp, MNTNAMLEN);
2994         mlp->ml_host[MNTNAMLEN] = '\0';
2995         strncpy(mlp->ml_dirp, dirp, MNTPATHLEN);
2996         mlp->ml_dirp[MNTPATHLEN] = '\0';
2997         mlp->ml_next = (struct mountlist *)NULL;
2998         *mlpp = mlp;
2999         if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
3000                 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST);
3001                 return;
3002         }
3003         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
3004         fclose(mlfile);
3005 }
3006
3007 /*
3008  * Free up a group list.
3009  */
3010 void
3011 free_grp(struct grouplist *grp)
3012 {
3013         if (grp->gr_type == GT_HOST) {
3014                 if (grp->gr_ptr.gt_addrinfo != NULL)
3015                         freeaddrinfo(grp->gr_ptr.gt_addrinfo);
3016         } else if (grp->gr_type == GT_NET) {
3017                 if (grp->gr_ptr.gt_net.nt_name)
3018                         free(grp->gr_ptr.gt_net.nt_name);
3019         }
3020         free((caddr_t)grp);
3021 }
3022
3023 #ifdef DEBUG
3024 void
3025 SYSLOG(int pri, const char *fmt, ...)
3026 {
3027         va_list ap;
3028
3029         va_start(ap, fmt);
3030         vfprintf(stderr, fmt, ap);
3031         va_end(ap);
3032 }
3033 #endif /* DEBUG */
3034
3035 /*
3036  * Check options for consistency.
3037  */
3038 int
3039 check_options(struct dirlist *dp)
3040 {
3041
3042         if (v4root_phase == 0 && dp == NULL)
3043             return (1);
3044         if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL)) {
3045             syslog(LOG_ERR, "-mapall and -maproot mutually exclusive");
3046             return (1);
3047         }
3048         if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) {
3049                 syslog(LOG_ERR, "-mask requires -network");
3050                 return (1);
3051         }
3052         if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) {
3053                 syslog(LOG_ERR, "-network requires mask specification");
3054                 return (1);
3055         }
3056         if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) {
3057                 syslog(LOG_ERR, "-mask and /masklen are mutually exclusive");
3058                 return (1);
3059         }
3060         if (v4root_phase > 0 &&
3061             (opt_flags &
3062              ~(OP_SEC | OP_MASK | OP_NET | OP_HAVEMASK | OP_MASKLEN)) != 0) {
3063             syslog(LOG_ERR,"only -sec,-net,-mask options allowed on V4:");
3064             return (1);
3065         }
3066         if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
3067             syslog(LOG_ERR, "-alldirs has multiple directories");
3068             return (1);
3069         }
3070         return (0);
3071 }
3072
3073 /*
3074  * Check an absolute directory path for any symbolic links. Return true
3075  */
3076 int
3077 check_dirpath(char *dirp)
3078 {
3079         char *cp;
3080         int ret = 1;
3081         struct stat sb;
3082
3083         cp = dirp + 1;
3084         while (*cp && ret) {
3085                 if (*cp == '/') {
3086                         *cp = '\0';
3087                         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
3088                                 ret = 0;
3089                         *cp = '/';
3090                 }
3091                 cp++;
3092         }
3093         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
3094                 ret = 0;
3095         return (ret);
3096 }
3097
3098 /*
3099  * Make a netmask according to the specified prefix length. The ss_family
3100  * and other non-address fields must be initialised before calling this.
3101  */
3102 int
3103 makemask(struct sockaddr_storage *ssp, int bitlen)
3104 {
3105         u_char *p;
3106         int bits, i, len;
3107
3108         if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL)
3109                 return (-1);
3110         if (bitlen > len * CHAR_BIT)
3111                 return (-1);
3112
3113         for (i = 0; i < len; i++) {
3114                 bits = (bitlen > CHAR_BIT) ? CHAR_BIT : bitlen;
3115                 *p++ = (u_char)~0 << (CHAR_BIT - bits);
3116                 bitlen -= bits;
3117         }
3118         return 0;
3119 }
3120
3121 /*
3122  * Check that the sockaddr is a valid netmask. Returns 0 if the mask
3123  * is acceptable (i.e. of the form 1...10....0).
3124  */
3125 int
3126 checkmask(struct sockaddr *sa)
3127 {
3128         u_char *mask;
3129         int i, len;
3130
3131         if ((mask = sa_rawaddr(sa, &len)) == NULL)
3132                 return (-1);
3133
3134         for (i = 0; i < len; i++)
3135                 if (mask[i] != 0xff)
3136                         break;
3137         if (i < len) {
3138                 if (~mask[i] & (u_char)(~mask[i] + 1))
3139                         return (-1);
3140                 i++;
3141         }
3142         for (; i < len; i++)
3143                 if (mask[i] != 0)
3144                         return (-1);
3145         return (0);
3146 }
3147
3148 /*
3149  * Compare two sockaddrs according to a specified mask. Return zero if
3150  * `sa1' matches `sa2' when filtered by the netmask in `samask'.
3151  * If samask is NULL, perform a full comparison.
3152  */
3153 int
3154 sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask)
3155 {
3156         unsigned char *p1, *p2, *mask;
3157         int len, i;
3158
3159         if (sa1->sa_family != sa2->sa_family ||
3160             (p1 = sa_rawaddr(sa1, &len)) == NULL ||
3161             (p2 = sa_rawaddr(sa2, NULL)) == NULL)
3162                 return (1);
3163
3164         switch (sa1->sa_family) {
3165         case AF_INET6:
3166                 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
3167                     ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
3168                         return (1);
3169                 break;
3170         }
3171
3172         /* Simple binary comparison if no mask specified. */
3173         if (samask == NULL)
3174                 return (memcmp(p1, p2, len));
3175
3176         /* Set up the mask, and do a mask-based comparison. */
3177         if (sa1->sa_family != samask->sa_family ||
3178             (mask = sa_rawaddr(samask, NULL)) == NULL)
3179                 return (1);
3180
3181         for (i = 0; i < len; i++)
3182                 if ((p1[i] & mask[i]) != (p2[i] & mask[i]))
3183                         return (1);
3184         return (0);
3185 }
3186
3187 /*
3188  * Return a pointer to the part of the sockaddr that contains the
3189  * raw address, and set *nbytes to its length in bytes. Returns
3190  * NULL if the address family is unknown.
3191  */
3192 void *
3193 sa_rawaddr(struct sockaddr *sa, int *nbytes) {
3194         void *p;
3195         int len;
3196
3197         switch (sa->sa_family) {
3198         case AF_INET:
3199                 len = sizeof(((struct sockaddr_in *)sa)->sin_addr);
3200                 p = &((struct sockaddr_in *)sa)->sin_addr;
3201                 break;
3202         case AF_INET6:
3203                 len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr);
3204                 p = &((struct sockaddr_in6 *)sa)->sin6_addr;
3205                 break;
3206         default:
3207                 p = NULL;
3208                 len = 0;
3209         }
3210
3211         if (nbytes != NULL)
3212                 *nbytes = len;
3213         return (p);
3214 }
3215
3216 void
3217 huphandler(int sig __unused)
3218 {
3219         got_sighup = 1;
3220 }
3221
3222 void terminate(int sig __unused)
3223 {
3224         pidfile_remove(pfh);
3225         rpcb_unset(MOUNTPROG, MOUNTVERS, NULL);
3226         rpcb_unset(MOUNTPROG, MOUNTVERS3, NULL);
3227         exit (0);
3228 }
3229