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