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 == EPROTONOSUPPORT &&
 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 *dirp;
1661         char errmsg[255];
1662         int dirplen, num, i;
1663         int iovlen;
1664         int done;
1665         struct nfsex_args eargs;
1666
1667         if (suspend_nfsd != 0)
1668                 (void)nfssvc(NFSSVC_SUSPENDNFSD, NULL);
1669         v4root_dirpath[0] = '\0';
1670         bzero(&export, sizeof(export));
1671         export.ex_flags = MNT_DELEXPORT;
1672         dirp = NULL;
1673         dirplen = 0;
1674         iov = NULL;
1675         iovlen = 0;
1676         bzero(errmsg, sizeof(errmsg));
1677
1678         /*
1679          * First, get rid of the old list
1680          */
1681         ep = exphead;
1682         while (ep) {
1683                 ep2 = ep;
1684                 ep = ep->ex_next;
1685                 free_exp(ep2);
1686         }
1687         exphead = (struct exportlist *)NULL;
1688
1689         grp = grphead;
1690         while (grp) {
1691                 tgrp = grp;
1692                 grp = grp->gr_next;
1693                 free_grp(tgrp);
1694         }
1695         grphead = (struct grouplist *)NULL;
1696
1697         /*
1698          * and the old V4 root dir.
1699          */
1700         bzero(&eargs, sizeof (eargs));
1701         eargs.export.ex_flags = MNT_DELEXPORT;
1702         if (run_v4server > 0 &&
1703             nfssvc(NFSSVC_V4ROOTEXPORT, (caddr_t)&eargs) < 0 &&
1704             errno != ENOENT)
1705                 syslog(LOG_ERR, "Can't delete exports for V4:");
1706
1707         /*
1708          * and clear flag that notes if a public fh has been exported.
1709          */
1710         has_publicfh = 0;
1711
1712         /*
1713          * And delete exports that are in the kernel for all local
1714          * filesystems.
1715          * XXX: Should know how to handle all local exportable filesystems.
1716          */
1717         num = getmntinfo(&mntbufp, MNT_NOWAIT);
1718
1719         if (num > 0) {
1720                 build_iovec(&iov, &iovlen, "fstype", NULL, 0);
1721                 build_iovec(&iov, &iovlen, "fspath", NULL, 0);
1722                 build_iovec(&iov, &iovlen, "from", NULL, 0);
1723                 build_iovec(&iov, &iovlen, "update", NULL, 0);
1724                 build_iovec(&iov, &iovlen, "export", &export, sizeof(export));
1725                 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
1726         }
1727
1728         for (i = 0; i < num; i++) {
1729                 fsp = &mntbufp[i];
1730                 if (getvfsbyname(fsp->f_fstypename, &vfc) != 0) {
1731                         syslog(LOG_ERR, "getvfsbyname() failed for %s",
1732                             fsp->f_fstypename);
1733                         continue;
1734                 }
1735
1736                 /*
1737                  * Do not delete export for network filesystem by
1738                  * passing "export" arg to nmount().
1739                  * It only makes sense to do this for local filesystems.
1740                  */
1741                 if (vfc.vfc_flags & VFCF_NETWORK)
1742                         continue;
1743
1744                 iov[1].iov_base = fsp->f_fstypename;
1745                 iov[1].iov_len = strlen(fsp->f_fstypename) + 1;
1746                 iov[3].iov_base = fsp->f_mntonname;
1747                 iov[3].iov_len = strlen(fsp->f_mntonname) + 1;
1748                 iov[5].iov_base = fsp->f_mntfromname;
1749                 iov[5].iov_len = strlen(fsp->f_mntfromname) + 1;
1750                 errmsg[0] = '\0';
1751
1752                 if (nmount(iov, iovlen, fsp->f_flags) < 0 &&
1753                     errno != ENOENT && errno != ENOTSUP) {
1754                         syslog(LOG_ERR,
1755                             "can't delete exports for %s: %m %s",
1756                             fsp->f_mntonname, errmsg);
1757                 }
1758         }
1759
1760         if (iov != NULL) {
1761                 /* Free strings allocated by strdup() in getmntopts.c */
1762                 free(iov[0].iov_base); /* fstype */
1763                 free(iov[2].iov_base); /* fspath */
1764                 free(iov[4].iov_base); /* from */
1765                 free(iov[6].iov_base); /* update */
1766                 free(iov[8].iov_base); /* export */
1767                 free(iov[10].iov_base); /* errmsg */
1768
1769                 /* free iov, allocated by realloc() */
1770                 free(iov);
1771                 iovlen = 0;
1772         }
1773
1774         /*
1775          * Read in the exports file and build the list, calling
1776          * nmount() as we go along to push the export rules into the kernel.
1777          */
1778         done = 0;
1779         for (i = 0; exnames[i] != NULL; i++) {
1780                 if (debug)
1781                         warnx("reading exports from %s", exnames[i]);
1782                 if ((exp_file = fopen(exnames[i], "r")) == NULL) {
1783                         syslog(LOG_WARNING, "can't open %s", exnames[i]);
1784                         continue;
1785                 }
1786                 get_exportlist_one();
1787                 fclose(exp_file);
1788                 done++;
1789         }
1790         if (done == 0) {
1791                 syslog(LOG_ERR, "can't open any exports file");
1792                 exit(2);
1793         }
1794
1795         /*
1796          * If there was no public fh, clear any previous one set.
1797          */
1798         if (run_v4server > 0 && has_publicfh == 0)
1799                 (void) nfssvc(NFSSVC_NOPUBLICFH, NULL);
1800
1801         /* Resume the nfsd. If they weren't suspended, this is harmless. */
1802         (void)nfssvc(NFSSVC_RESUMENFSD, NULL);
1803 }
1804
1805 /*
1806  * Allocate an export list element
1807  */
1808 struct exportlist *
1809 get_exp(void)
1810 {
1811         struct exportlist *ep;
1812
1813         ep = (struct exportlist *)calloc(1, sizeof (struct exportlist));
1814         if (ep == (struct exportlist *)NULL)
1815                 out_of_mem();
1816         return (ep);
1817 }
1818
1819 /*
1820  * Allocate a group list element
1821  */
1822 struct grouplist *
1823 get_grp(void)
1824 {
1825         struct grouplist *gp;
1826
1827         gp = (struct grouplist *)calloc(1, sizeof (struct grouplist));
1828         if (gp == (struct grouplist *)NULL)
1829                 out_of_mem();
1830         return (gp);
1831 }
1832
1833 /*
1834  * Clean up upon an error in get_exportlist().
1835  */
1836 void
1837 getexp_err(struct exportlist *ep, struct grouplist *grp)
1838 {
1839         struct grouplist *tgrp;
1840
1841         if (!(opt_flags & OP_QUIET))
1842                 syslog(LOG_ERR, "bad exports list line %s", line);
1843         if (ep && (ep->ex_flag & EX_LINKED) == 0)
1844                 free_exp(ep);
1845         while (grp) {
1846                 tgrp = grp;
1847                 grp = grp->gr_next;
1848                 free_grp(tgrp);
1849         }
1850 }
1851
1852 /*
1853  * Search the export list for a matching fs.
1854  */
1855 struct exportlist *
1856 ex_search(fsid_t *fsid)
1857 {
1858         struct exportlist *ep;
1859
1860         ep = exphead;
1861         while (ep) {
1862                 if (ep->ex_fs.val[0] == fsid->val[0] &&
1863                     ep->ex_fs.val[1] == fsid->val[1])
1864                         return (ep);
1865                 ep = ep->ex_next;
1866         }
1867         return (ep);
1868 }
1869
1870 /*
1871  * Add a directory path to the list.
1872  */
1873 char *
1874 add_expdir(struct dirlist **dpp, char *cp, int len)
1875 {
1876         struct dirlist *dp;
1877
1878         dp = (struct dirlist *)malloc(sizeof (struct dirlist) + len);
1879         if (dp == (struct dirlist *)NULL)
1880                 out_of_mem();
1881         dp->dp_left = *dpp;
1882         dp->dp_right = (struct dirlist *)NULL;
1883         dp->dp_flag = 0;
1884         dp->dp_hosts = (struct hostlist *)NULL;
1885         strcpy(dp->dp_dirp, cp);
1886         *dpp = dp;
1887         return (dp->dp_dirp);
1888 }
1889
1890 /*
1891  * Hang the dir list element off the dirpath binary tree as required
1892  * and update the entry for host.
1893  */
1894 void
1895 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep,
1896         int flags)
1897 {
1898         struct hostlist *hp;
1899         struct dirlist *dp2;
1900
1901         if (flags & OP_ALLDIRS) {
1902                 if (ep->ex_defdir)
1903                         free((caddr_t)dp);
1904                 else
1905                         ep->ex_defdir = dp;
1906                 if (grp == (struct grouplist *)NULL) {
1907                         ep->ex_defdir->dp_flag |= DP_DEFSET;
1908                         /* Save the default security flavors list. */
1909                         ep->ex_defnumsecflavors = ep->ex_numsecflavors;
1910                         if (ep->ex_numsecflavors > 0)
1911                                 memcpy(ep->ex_defsecflavors, ep->ex_secflavors,
1912                                     sizeof(ep->ex_secflavors));
1913                 } else while (grp) {
1914                         hp = get_ht();
1915                         hp->ht_grp = grp;
1916                         hp->ht_next = ep->ex_defdir->dp_hosts;
1917                         ep->ex_defdir->dp_hosts = hp;
1918                         /* Save the security flavors list for this host set. */
1919                         grp->gr_numsecflavors = ep->ex_numsecflavors;
1920                         if (ep->ex_numsecflavors > 0)
1921                                 memcpy(grp->gr_secflavors, ep->ex_secflavors,
1922                                     sizeof(ep->ex_secflavors));
1923                         grp = grp->gr_next;
1924                 }
1925         } else {
1926
1927                 /*
1928                  * Loop through the directories adding them to the tree.
1929                  */
1930                 while (dp) {
1931                         dp2 = dp->dp_left;
1932                         add_dlist(&ep->ex_dirl, dp, grp, flags, ep);
1933                         dp = dp2;
1934                 }
1935         }
1936 }
1937
1938 /*
1939  * Traverse the binary tree either updating a node that is already there
1940  * for the new directory or adding the new node.
1941  */
1942 void
1943 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp,
1944         int flags, struct exportlist *ep)
1945 {
1946         struct dirlist *dp;
1947         struct hostlist *hp;
1948         int cmp;
1949
1950         dp = *dpp;
1951         if (dp) {
1952                 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp);
1953                 if (cmp > 0) {
1954                         add_dlist(&dp->dp_left, newdp, grp, flags, ep);
1955                         return;
1956                 } else if (cmp < 0) {
1957                         add_dlist(&dp->dp_right, newdp, grp, flags, ep);
1958                         return;
1959                 } else
1960                         free((caddr_t)newdp);
1961         } else {
1962                 dp = newdp;
1963                 dp->dp_left = (struct dirlist *)NULL;
1964                 *dpp = dp;
1965         }
1966         if (grp) {
1967
1968                 /*
1969                  * Hang all of the host(s) off of the directory point.
1970                  */
1971                 do {
1972                         hp = get_ht();
1973                         hp->ht_grp = grp;
1974                         hp->ht_next = dp->dp_hosts;
1975                         dp->dp_hosts = hp;
1976                         /* Save the security flavors list for this host set. */
1977                         grp->gr_numsecflavors = ep->ex_numsecflavors;
1978                         if (ep->ex_numsecflavors > 0)
1979                                 memcpy(grp->gr_secflavors, ep->ex_secflavors,
1980                                     sizeof(ep->ex_secflavors));
1981                         grp = grp->gr_next;
1982                 } while (grp);
1983         } else {
1984                 dp->dp_flag |= DP_DEFSET;
1985                 /* Save the default security flavors list. */
1986                 ep->ex_defnumsecflavors = ep->ex_numsecflavors;
1987                 if (ep->ex_numsecflavors > 0)
1988                         memcpy(ep->ex_defsecflavors, ep->ex_secflavors,
1989                             sizeof(ep->ex_secflavors));
1990         }
1991 }
1992
1993 /*
1994  * Search for a dirpath on the export point.
1995  */
1996 struct dirlist *
1997 dirp_search(struct dirlist *dp, char *dirp)
1998 {
1999         int cmp;
2000
2001         if (dp) {
2002                 cmp = strcmp(dp->dp_dirp, dirp);
2003                 if (cmp > 0)
2004                         return (dirp_search(dp->dp_left, dirp));
2005                 else if (cmp < 0)
2006                         return (dirp_search(dp->dp_right, dirp));
2007                 else
2008                         return (dp);
2009         }
2010         return (dp);
2011 }
2012
2013 /*
2014  * Scan for a host match in a directory tree.
2015  */
2016 int
2017 chk_host(struct dirlist *dp, struct sockaddr *saddr, int *defsetp,
2018         int *hostsetp, int *numsecflavors, int **secflavorsp)
2019 {
2020         struct hostlist *hp;
2021         struct grouplist *grp;
2022         struct addrinfo *ai;
2023
2024         if (dp) {
2025                 if (dp->dp_flag & DP_DEFSET)
2026                         *defsetp = dp->dp_flag;
2027                 hp = dp->dp_hosts;
2028                 while (hp) {
2029                         grp = hp->ht_grp;
2030                         switch (grp->gr_type) {
2031                         case GT_HOST:
2032                                 ai = grp->gr_ptr.gt_addrinfo;
2033                                 for (; ai; ai = ai->ai_next) {
2034                                         if (!sacmp(ai->ai_addr, saddr, NULL)) {
2035                                                 *hostsetp =
2036                                                     (hp->ht_flag | DP_HOSTSET);
2037                                                 if (numsecflavors != NULL) {
2038                                                         *numsecflavors =
2039                                                             grp->gr_numsecflavors;
2040                                                         *secflavorsp =
2041                                                             grp->gr_secflavors;
2042                                                 }
2043                                                 return (1);
2044                                         }
2045                                 }
2046                                 break;
2047                         case GT_NET:
2048                                 if (!sacmp(saddr, (struct sockaddr *)
2049                                     &grp->gr_ptr.gt_net.nt_net,
2050                                     (struct sockaddr *)
2051                                     &grp->gr_ptr.gt_net.nt_mask)) {
2052                                         *hostsetp = (hp->ht_flag | DP_HOSTSET);
2053                                         if (numsecflavors != NULL) {
2054                                                 *numsecflavors =
2055                                                     grp->gr_numsecflavors;
2056                                                 *secflavorsp =
2057                                                     grp->gr_secflavors;
2058                                         }
2059                                         return (1);
2060                                 }
2061                                 break;
2062                         }
2063                         hp = hp->ht_next;
2064                 }
2065         }
2066         return (0);
2067 }
2068
2069 /*
2070  * Scan tree for a host that matches the address.
2071  */
2072 int
2073 scan_tree(struct dirlist *dp, struct sockaddr *saddr)
2074 {
2075         int defset, hostset;
2076
2077         if (dp) {
2078                 if (scan_tree(dp->dp_left, saddr))
2079                         return (1);
2080                 if (chk_host(dp, saddr, &defset, &hostset, NULL, NULL))
2081                         return (1);
2082                 if (scan_tree(dp->dp_right, saddr))
2083                         return (1);
2084         }
2085         return (0);
2086 }
2087
2088 /*
2089  * Traverse the dirlist tree and free it up.
2090  */
2091 void
2092 free_dir(struct dirlist *dp)
2093 {
2094
2095         if (dp) {
2096                 free_dir(dp->dp_left);
2097                 free_dir(dp->dp_right);
2098                 free_host(dp->dp_hosts);
2099                 free((caddr_t)dp);
2100         }
2101 }
2102
2103 /*
2104  * Parse a colon separated list of security flavors
2105  */
2106 int
2107 parsesec(char *seclist, struct exportlist *ep)
2108 {
2109         char *cp, savedc;
2110         int flavor;
2111
2112         ep->ex_numsecflavors = 0;
2113         for (;;) {
2114                 cp = strchr(seclist, ':');
2115                 if (cp) {
2116                         savedc = *cp;
2117                         *cp = '\0';
2118                 }
2119
2120                 if (!strcmp(seclist, "sys"))
2121                         flavor = AUTH_SYS;
2122                 else if (!strcmp(seclist, "krb5"))
2123                         flavor = RPCSEC_GSS_KRB5;
2124                 else if (!strcmp(seclist, "krb5i"))
2125                         flavor = RPCSEC_GSS_KRB5I;
2126                 else if (!strcmp(seclist, "krb5p"))
2127                         flavor = RPCSEC_GSS_KRB5P;
2128                 else {
2129                         if (cp)
2130                                 *cp = savedc;
2131                         syslog(LOG_ERR, "bad sec flavor: %s", seclist);
2132                         return (1);
2133                 }
2134                 if (ep->ex_numsecflavors == MAXSECFLAVORS) {
2135                         if (cp)
2136                                 *cp = savedc;
2137                         syslog(LOG_ERR, "too many sec flavors: %s", seclist);
2138                         return (1);
2139                 }
2140                 ep->ex_secflavors[ep->ex_numsecflavors] = flavor;
2141                 ep->ex_numsecflavors++;
2142                 if (cp) {
2143                         *cp = savedc;
2144                         seclist = cp + 1;
2145                 } else {
2146                         break;
2147                 }
2148         }
2149         return (0);
2150 }
2151
2152 /*
2153  * Parse the option string and update fields.
2154  * Option arguments may either be -<option>=<value> or
2155  * -<option> <value>
2156  */
2157 int
2158 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp,
2159         int *has_hostp, int *exflagsp, struct xucred *cr)
2160 {
2161         char *cpoptarg, *cpoptend;
2162         char *cp, *endcp, *cpopt, savedc, savedc2;
2163         int allflag, usedarg;
2164
2165         savedc2 = '\0';
2166         cpopt = *cpp;
2167         cpopt++;
2168         cp = *endcpp;
2169         savedc = *cp;
2170         *cp = '\0';
2171         while (cpopt && *cpopt) {
2172                 allflag = 1;
2173                 usedarg = -2;
2174                 if ((cpoptend = strchr(cpopt, ','))) {
2175                         *cpoptend++ = '\0';
2176                         if ((cpoptarg = strchr(cpopt, '=')))
2177                                 *cpoptarg++ = '\0';
2178                 } else {
2179                         if ((cpoptarg = strchr(cpopt, '=')))
2180                                 *cpoptarg++ = '\0';
2181                         else {
2182                                 *cp = savedc;
2183                                 nextfield(&cp, &endcp);
2184                                 **endcpp = '\0';
2185                                 if (endcp > cp && *cp != '-') {
2186                                         cpoptarg = cp;
2187                                         savedc2 = *endcp;
2188                                         *endcp = '\0';
2189                                         usedarg = 0;
2190                                 }
2191                         }
2192                 }
2193                 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) {
2194                         *exflagsp |= MNT_EXRDONLY;
2195                 } else if (cpoptarg && (!strcmp(cpopt, "maproot") ||
2196                     !(allflag = strcmp(cpopt, "mapall")) ||
2197                     !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) {
2198                         usedarg++;
2199                         parsecred(cpoptarg, cr);
2200                         if (allflag == 0) {
2201                                 *exflagsp |= MNT_EXPORTANON;
2202                                 opt_flags |= OP_MAPALL;
2203                         } else
2204                                 opt_flags |= OP_MAPROOT;
2205                 } else if (cpoptarg && (!strcmp(cpopt, "mask") ||
2206                     !strcmp(cpopt, "m"))) {
2207                         if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) {
2208                                 syslog(LOG_ERR, "bad mask: %s", cpoptarg);
2209                                 return (1);
2210                         }
2211                         usedarg++;
2212                         opt_flags |= OP_MASK;
2213                 } else if (cpoptarg && (!strcmp(cpopt, "network") ||
2214                         !strcmp(cpopt, "n"))) {
2215                         if (strchr(cpoptarg, '/') != NULL) {
2216                                 if (debug)
2217                                         fprintf(stderr, "setting OP_MASKLEN\n");
2218                                 opt_flags |= OP_MASKLEN;
2219                         }
2220                         if (grp->gr_type != GT_NULL) {
2221                                 syslog(LOG_ERR, "network/host conflict");
2222                                 return (1);
2223                         } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) {
2224                                 syslog(LOG_ERR, "bad net: %s", cpoptarg);
2225                                 return (1);
2226                         }
2227                         grp->gr_type = GT_NET;
2228                         *has_hostp = 1;
2229                         usedarg++;
2230                         opt_flags |= OP_NET;
2231                 } else if (!strcmp(cpopt, "alldirs")) {
2232                         opt_flags |= OP_ALLDIRS;
2233                 } else if (!strcmp(cpopt, "public")) {
2234                         *exflagsp |= MNT_EXPUBLIC;
2235                 } else if (!strcmp(cpopt, "webnfs")) {
2236                         *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON);
2237                         opt_flags |= OP_MAPALL;
2238                 } else if (cpoptarg && !strcmp(cpopt, "index")) {
2239                         ep->ex_indexfile = strdup(cpoptarg);
2240                 } else if (!strcmp(cpopt, "quiet")) {
2241                         opt_flags |= OP_QUIET;
2242                 } else if (cpoptarg && !strcmp(cpopt, "sec")) {
2243                         if (parsesec(cpoptarg, ep))
2244                                 return (1);
2245                         opt_flags |= OP_SEC;
2246                         usedarg++;
2247                 } else {
2248                         syslog(LOG_ERR, "bad opt %s", cpopt);
2249                         return (1);
2250                 }
2251                 if (usedarg >= 0) {
2252                         *endcp = savedc2;
2253                         **endcpp = savedc;
2254                         if (usedarg > 0) {
2255                                 *cpp = cp;
2256                                 *endcpp = endcp;
2257                         }
2258                         return (0);
2259                 }
2260                 cpopt = cpoptend;
2261         }
2262         **endcpp = savedc;
2263         return (0);
2264 }
2265
2266 /*
2267  * Translate a character string to the corresponding list of network
2268  * addresses for a hostname.
2269  */
2270 int
2271 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp)
2272 {
2273         struct grouplist *checkgrp;
2274         struct addrinfo *ai, *tai, hints;
2275         int ecode;
2276         char host[NI_MAXHOST];
2277
2278         if (grp->gr_type != GT_NULL) {
2279                 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp);
2280                 return (1);
2281         }
2282         memset(&hints, 0, sizeof hints);
2283         hints.ai_flags = AI_CANONNAME;
2284         hints.ai_protocol = IPPROTO_UDP;
2285         ecode = getaddrinfo(cp, NULL, &hints, &ai);
2286         if (ecode != 0) {
2287                 syslog(LOG_ERR,"can't get address info for host %s", cp);
2288                 return 1;
2289         }
2290         grp->gr_ptr.gt_addrinfo = ai;
2291         while (ai != NULL) {
2292                 if (ai->ai_canonname == NULL) {
2293                         if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host,
2294                             sizeof host, NULL, 0, NI_NUMERICHOST) != 0)
2295                                 strlcpy(host, "?", sizeof(host));
2296                         ai->ai_canonname = strdup(host);
2297                         ai->ai_flags |= AI_CANONNAME;
2298                 }
2299                 if (debug)
2300                         fprintf(stderr, "got host %s\n", ai->ai_canonname);
2301                 /*
2302                  * Sanity check: make sure we don't already have an entry
2303                  * for this host in the grouplist.
2304                  */
2305                 for (checkgrp = tgrp; checkgrp != NULL;
2306                     checkgrp = checkgrp->gr_next) {
2307                         if (checkgrp->gr_type != GT_HOST)
2308                                 continue;
2309                         for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL;
2310                             tai = tai->ai_next) {
2311                                 if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0)
2312                                         continue;
2313                                 if (debug)
2314                                         fprintf(stderr,
2315                                             "ignoring duplicate host %s\n",
2316                                             ai->ai_canonname);
2317                                 grp->gr_type = GT_IGNORE;
2318                                 return (0);
2319                         }
2320                 }
2321                 ai = ai->ai_next;
2322         }
2323         grp->gr_type = GT_HOST;
2324         return (0);
2325 }
2326
2327 /*
2328  * Free up an exports list component
2329  */
2330 void
2331 free_exp(struct exportlist *ep)
2332 {
2333
2334         if (ep->ex_defdir) {
2335                 free_host(ep->ex_defdir->dp_hosts);
2336                 free((caddr_t)ep->ex_defdir);
2337         }
2338         if (ep->ex_fsdir)
2339                 free(ep->ex_fsdir);
2340         if (ep->ex_indexfile)
2341                 free(ep->ex_indexfile);
2342         free_dir(ep->ex_dirl);
2343         free((caddr_t)ep);
2344 }
2345
2346 /*
2347  * Free hosts.
2348  */
2349 void
2350 free_host(struct hostlist *hp)
2351 {
2352         struct hostlist *hp2;
2353
2354         while (hp) {
2355                 hp2 = hp;
2356                 hp = hp->ht_next;
2357                 free((caddr_t)hp2);
2358         }
2359 }
2360
2361 struct hostlist *
2362 get_ht(void)
2363 {
2364         struct hostlist *hp;
2365
2366         hp = (struct hostlist *)malloc(sizeof (struct hostlist));
2367         if (hp == (struct hostlist *)NULL)
2368                 out_of_mem();
2369         hp->ht_next = (struct hostlist *)NULL;
2370         hp->ht_flag = 0;
2371         return (hp);
2372 }
2373
2374 /*
2375  * Out of memory, fatal
2376  */
2377 void
2378 out_of_mem(void)
2379 {
2380
2381         syslog(LOG_ERR, "out of memory");
2382         exit(2);
2383 }
2384
2385 /*
2386  * Do the nmount() syscall with the update flag to push the export info into
2387  * the kernel.
2388  */
2389 int
2390 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags,
2391     struct xucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb)
2392 {
2393         struct statfs fsb1;
2394         struct addrinfo *ai;
2395         struct export_args ea, *eap;
2396         char errmsg[255];
2397         char *cp;
2398         int done;
2399         char savedc;
2400         struct iovec *iov;
2401         int i, iovlen;
2402         int ret;
2403         struct nfsex_args nfsea;
2404
2405         if (run_v4server > 0)
2406                 eap = &nfsea.export;
2407         else
2408                 eap = &ea;
2409
2410         cp = NULL;
2411         savedc = '\0';
2412         iov = NULL;
2413         iovlen = 0;
2414         ret = 0;
2415
2416         bzero(eap, sizeof (struct export_args));
2417         bzero(errmsg, sizeof(errmsg));
2418         eap->ex_flags = exflags;
2419         eap->ex_anon = *anoncrp;
2420         eap->ex_indexfile = ep->ex_indexfile;
2421         if (grp->gr_type == GT_HOST)
2422                 ai = grp->gr_ptr.gt_addrinfo;
2423         else
2424                 ai = NULL;
2425         eap->ex_numsecflavors = ep->ex_numsecflavors;
2426         for (i = 0; i < eap->ex_numsecflavors; i++)
2427                 eap->ex_secflavors[i] = ep->ex_secflavors[i];
2428         if (eap->ex_numsecflavors == 0) {
2429                 eap->ex_numsecflavors = 1;
2430                 eap->ex_secflavors[0] = AUTH_SYS;
2431         }
2432         done = FALSE;
2433
2434         if (v4root_phase == 0) {
2435                 build_iovec(&iov, &iovlen, "fstype", NULL, 0);
2436                 build_iovec(&iov, &iovlen, "fspath", NULL, 0);
2437                 build_iovec(&iov, &iovlen, "from", NULL, 0);
2438                 build_iovec(&iov, &iovlen, "update", NULL, 0);
2439                 build_iovec(&iov, &iovlen, "export", eap,
2440                     sizeof (struct export_args));
2441                 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
2442         }
2443
2444         while (!done) {
2445                 switch (grp->gr_type) {
2446                 case GT_HOST:
2447                         if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0)
2448                                 goto skip;
2449                         eap->ex_addr = ai->ai_addr;
2450                         eap->ex_addrlen = ai->ai_addrlen;
2451                         eap->ex_masklen = 0;
2452                         break;
2453                 case GT_NET:
2454                         if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 &&
2455                             have_v6 == 0)
2456                                 goto skip;
2457                         eap->ex_addr =
2458                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net;
2459                         eap->ex_addrlen =
2460                             ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_net)->sa_len;
2461                         eap->ex_mask =
2462                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask;
2463                         eap->ex_masklen = ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask)->sa_len;
2464                         break;
2465                 case GT_DEFAULT:
2466                         eap->ex_addr = NULL;
2467                         eap->ex_addrlen = 0;
2468                         eap->ex_mask = NULL;
2469                         eap->ex_masklen = 0;
2470                         break;
2471                 case GT_IGNORE:
2472                         ret = 0;
2473                         goto error_exit;
2474                         break;
2475                 default:
2476                         syslog(LOG_ERR, "bad grouptype");
2477                         if (cp)
2478                                 *cp = savedc;
2479                         ret = 1;
2480                         goto error_exit;
2481                 };
2482
2483                 /*
2484                  * For V4:, use the nfssvc() syscall, instead of mount().
2485                  */
2486                 if (v4root_phase == 2) {
2487                         nfsea.fspec = v4root_dirpath;
2488                         if (run_v4server > 0 &&
2489                             nfssvc(NFSSVC_V4ROOTEXPORT, (caddr_t)&nfsea) < 0) {
2490                                 syslog(LOG_ERR, "Exporting V4: failed");
2491                                 return (2);
2492                         }
2493                 } else {
2494                         /*
2495                          * XXX:
2496                          * Maybe I should just use the fsb->f_mntonname path
2497                          * instead of looping back up the dirp to the mount
2498                          * point??
2499                          * Also, needs to know how to export all types of local
2500                          * exportable filesystems and not just "ufs".
2501                          */
2502                         iov[1].iov_base = fsb->f_fstypename; /* "fstype" */
2503                         iov[1].iov_len = strlen(fsb->f_fstypename) + 1;
2504                         iov[3].iov_base = fsb->f_mntonname; /* "fspath" */
2505                         iov[3].iov_len = strlen(fsb->f_mntonname) + 1;
2506                         iov[5].iov_base = fsb->f_mntfromname; /* "from" */
2507                         iov[5].iov_len = strlen(fsb->f_mntfromname) + 1;
2508                         errmsg[0] = '\0';
2509
2510                         while (nmount(iov, iovlen, fsb->f_flags) < 0) {
2511                                 if (cp)
2512                                         *cp-- = savedc;
2513                                 else
2514                                         cp = dirp + dirplen - 1;
2515                                 if (opt_flags & OP_QUIET) {
2516                                         ret = 1;
2517                                         goto error_exit;
2518                                 }
2519                                 if (errno == EPERM) {
2520                                         if (debug)
2521                                                 warnx("can't change attributes for %s: %s",
2522                                                     dirp, errmsg);
2523                                         syslog(LOG_ERR,
2524                                            "can't change attributes for %s: %s",
2525                                             dirp, errmsg);
2526                                         ret = 1;
2527                                         goto error_exit;
2528                                 }
2529                                 if (opt_flags & OP_ALLDIRS) {
2530                                         if (errno == EINVAL)
2531                                                 syslog(LOG_ERR,
2532                 "-alldirs requested but %s is not a filesystem mountpoint",
2533                                                     dirp);
2534                                         else
2535                                                 syslog(LOG_ERR,
2536                                                     "could not remount %s: %m",
2537                                                     dirp);
2538                                         ret = 1;
2539                                         goto error_exit;
2540                                 }
2541                                 /* back up over the last component */
2542                                 while (*cp == '/' && cp > dirp)
2543                                         cp--;
2544                                 while (*(cp - 1) != '/' && cp > dirp)
2545                                         cp--;
2546                                 if (cp == dirp) {
2547                                         if (debug)
2548                                                 warnx("mnt unsucc");
2549                                         syslog(LOG_ERR, "can't export %s %s",
2550                                             dirp, errmsg);
2551                                         ret = 1;
2552                                         goto error_exit;
2553                                 }
2554                                 savedc = *cp;
2555                                 *cp = '\0';
2556                                 /*
2557                                  * Check that we're still on the same
2558                                  * filesystem.
2559                                  */
2560                                 if (statfs(dirp, &fsb1) != 0 ||
2561                                     bcmp(&fsb1.f_fsid, &fsb->f_fsid,
2562                                     sizeof (fsb1.f_fsid)) != 0) {
2563                                         *cp = savedc;
2564                                         syslog(LOG_ERR,
2565                                             "can't export %s %s", dirp,
2566                                             errmsg);
2567                                         ret = 1;
2568                                         goto error_exit;
2569                                 }
2570                         }
2571                 }
2572
2573                 /*
2574                  * For the experimental server:
2575                  * If this is the public directory, get the file handle
2576                  * and load it into the kernel via the nfssvc() syscall.
2577                  */
2578                 if (run_v4server > 0 && (exflags & MNT_EXPUBLIC) != 0) {
2579                         fhandle_t fh;
2580                         char *public_name;
2581
2582                         if (eap->ex_indexfile != NULL)
2583                                 public_name = eap->ex_indexfile;
2584                         else
2585                                 public_name = dirp;
2586                         if (getfh(public_name, &fh) < 0)
2587                                 syslog(LOG_ERR,
2588                                     "Can't get public fh for %s", public_name);
2589                         else if (nfssvc(NFSSVC_PUBLICFH, (caddr_t)&fh) < 0)
2590                                 syslog(LOG_ERR,
2591                                     "Can't set public fh for %s", public_name);
2592                         else
2593                                 has_publicfh = 1;
2594                 }
2595 skip:
2596                 if (ai != NULL)
2597                         ai = ai->ai_next;
2598                 if (ai == NULL)
2599                         done = TRUE;
2600         }
2601         if (cp)
2602                 *cp = savedc;
2603 error_exit:
2604         /* free strings allocated by strdup() in getmntopts.c */
2605         if (iov != NULL) {
2606                 free(iov[0].iov_base); /* fstype */
2607                 free(iov[2].iov_base); /* fspath */
2608                 free(iov[4].iov_base); /* from */
2609                 free(iov[6].iov_base); /* update */
2610                 free(iov[8].iov_base); /* export */
2611                 free(iov[10].iov_base); /* errmsg */
2612
2613                 /* free iov, allocated by realloc() */
2614                 free(iov);
2615         }
2616         return (ret);
2617 }
2618
2619 /*
2620  * Translate a net address.
2621  *
2622  * If `maskflg' is nonzero, then `cp' is a netmask, not a network address.
2623  */
2624 int
2625 get_net(char *cp, struct netmsk *net, int maskflg)
2626 {
2627         struct netent *np = NULL;
2628         char *name, *p, *prefp;
2629         struct sockaddr_in sin;
2630         struct sockaddr *sa = NULL;
2631         struct addrinfo hints, *ai = NULL;
2632         char netname[NI_MAXHOST];
2633         long preflen;
2634
2635         p = prefp = NULL;
2636         if ((opt_flags & OP_MASKLEN) && !maskflg) {
2637                 p = strchr(cp, '/');
2638                 *p = '\0';
2639                 prefp = p + 1;
2640         }
2641
2642         /*
2643          * Check for a numeric address first. We wish to avoid
2644          * possible DNS lookups in getnetbyname().
2645          */
2646         if (isxdigit(*cp) || *cp == ':') {
2647                 memset(&hints, 0, sizeof hints);
2648                 /* Ensure the mask and the network have the same family. */
2649                 if (maskflg && (opt_flags & OP_NET))
2650                         hints.ai_family = net->nt_net.ss_family;
2651                 else if (!maskflg && (opt_flags & OP_HAVEMASK))
2652                         hints.ai_family = net->nt_mask.ss_family;
2653                 else
2654                         hints.ai_family = AF_UNSPEC;
2655                 hints.ai_flags = AI_NUMERICHOST;
2656                 if (getaddrinfo(cp, NULL, &hints, &ai) == 0)
2657                         sa = ai->ai_addr;
2658                 if (sa != NULL && ai->ai_family == AF_INET) {
2659                         /*
2660                          * The address in `cp' is really a network address, so
2661                          * use inet_network() to re-interpret this correctly.
2662                          * e.g. "127.1" means 127.1.0.0, not 127.0.0.1.
2663                          */
2664                         bzero(&sin, sizeof sin);
2665                         sin.sin_family = AF_INET;
2666                         sin.sin_len = sizeof sin;
2667                         sin.sin_addr = inet_makeaddr(inet_network(cp), 0);
2668                         if (debug)
2669                                 fprintf(stderr, "get_net: v4 addr %s\n",
2670                                     inet_ntoa(sin.sin_addr));
2671                         sa = (struct sockaddr *)&sin;
2672                 }
2673         }
2674         if (sa == NULL && (np = getnetbyname(cp)) != NULL) {
2675                 bzero(&sin, sizeof sin);
2676                 sin.sin_family = AF_INET;
2677                 sin.sin_len = sizeof sin;
2678                 sin.sin_addr = inet_makeaddr(np->n_net, 0);
2679                 sa = (struct sockaddr *)&sin;
2680         }
2681         if (sa == NULL)
2682                 goto fail;
2683
2684         if (maskflg) {
2685                 /* The specified sockaddr is a mask. */
2686                 if (checkmask(sa) != 0)
2687                         goto fail;
2688                 bcopy(sa, &net->nt_mask, sa->sa_len);
2689                 opt_flags |= OP_HAVEMASK;
2690         } else {
2691                 /* The specified sockaddr is a network address. */
2692                 bcopy(sa, &net->nt_net, sa->sa_len);
2693
2694                 /* Get a network name for the export list. */
2695                 if (np) {
2696                         name = np->n_name;
2697                 } else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname,
2698                    NULL, 0, NI_NUMERICHOST) == 0) {
2699                         name = netname;
2700                 } else {
2701                         goto fail;
2702                 }
2703                 if ((net->nt_name = strdup(name)) == NULL)
2704                         out_of_mem();
2705
2706                 /*
2707                  * Extract a mask from either a "/<masklen>" suffix, or
2708                  * from the class of an IPv4 address.
2709                  */
2710                 if (opt_flags & OP_MASKLEN) {
2711                         preflen = strtol(prefp, NULL, 10);
2712                         if (preflen < 0L || preflen == LONG_MAX)
2713                                 goto fail;
2714                         bcopy(sa, &net->nt_mask, sa->sa_len);
2715                         if (makemask(&net->nt_mask, (int)preflen) != 0)
2716                                 goto fail;
2717                         opt_flags |= OP_HAVEMASK;
2718                         *p = '/';
2719                 } else if (sa->sa_family == AF_INET &&
2720                     (opt_flags & OP_MASK) == 0) {
2721                         in_addr_t addr;
2722
2723                         addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
2724                         if (IN_CLASSA(addr))
2725                                 preflen = 8;
2726                         else if (IN_CLASSB(addr))
2727                                 preflen = 16;
2728                         else if (IN_CLASSC(addr))
2729                                 preflen = 24;
2730                         else if (IN_CLASSD(addr))
2731                                 preflen = 28;
2732                         else
2733                                 preflen = 32;   /* XXX */
2734
2735                         bcopy(sa, &net->nt_mask, sa->sa_len);
2736                         makemask(&net->nt_mask, (int)preflen);
2737                         opt_flags |= OP_HAVEMASK;
2738                 }
2739         }
2740
2741         if (ai)
2742                 freeaddrinfo(ai);
2743         return 0;
2744
2745 fail:
2746         if (ai)
2747                 freeaddrinfo(ai);
2748         return 1;
2749 }
2750
2751 /*
2752  * Parse out the next white space separated field
2753  */
2754 void
2755 nextfield(char **cp, char **endcp)
2756 {
2757         char *p;
2758
2759         p = *cp;
2760         while (*p == ' ' || *p == '\t')
2761                 p++;
2762         if (*p == '\n' || *p == '\0')
2763                 *cp = *endcp = p;
2764         else {
2765                 *cp = p++;
2766                 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
2767                         p++;
2768                 *endcp = p;
2769         }
2770 }
2771
2772 /*
2773  * Get an exports file line. Skip over blank lines and handle line
2774  * continuations.
2775  */
2776 int
2777 get_line(void)
2778 {
2779         char *p, *cp;
2780         size_t len;
2781         int totlen, cont_line;
2782
2783         /*
2784          * Loop around ignoring blank lines and getting all continuation lines.
2785          */
2786         p = line;
2787         totlen = 0;
2788         do {
2789                 if ((p = fgetln(exp_file, &len)) == NULL)
2790                         return (0);
2791                 cp = p + len - 1;
2792                 cont_line = 0;
2793                 while (cp >= p &&
2794                     (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) {
2795                         if (*cp == '\\')
2796                                 cont_line = 1;
2797                         cp--;
2798                         len--;
2799                 }
2800                 if (cont_line) {
2801                         *++cp = ' ';
2802                         len++;
2803                 }
2804                 if (linesize < len + totlen + 1) {
2805                         linesize = len + totlen + 1;
2806                         line = realloc(line, linesize);
2807                         if (line == NULL)
2808                                 out_of_mem();
2809                 }
2810                 memcpy(line + totlen, p, len);
2811                 totlen += len;
2812                 line[totlen] = '\0';
2813         } while (totlen == 0 || cont_line);
2814         return (1);
2815 }
2816
2817 /*
2818  * Parse a description of a credential.
2819  */
2820 void
2821 parsecred(char *namelist, struct xucred *cr)
2822 {
2823         char *name;
2824         int cnt;
2825         char *names;
2826         struct passwd *pw;
2827         struct group *gr;
2828         gid_t groups[XU_NGROUPS + 1];
2829         int ngroups;
2830
2831         cr->cr_version = XUCRED_VERSION;
2832         /*
2833          * Set up the unprivileged user.
2834          */
2835         cr->cr_uid = -2;
2836         cr->cr_groups[0] = -2;
2837         cr->cr_ngroups = 1;
2838         /*
2839          * Get the user's password table entry.
2840          */
2841         names = strsep(&namelist, " \t\n");
2842         name = strsep(&names, ":");
2843         if (isdigit(*name) || *name == '-')
2844                 pw = getpwuid(atoi(name));
2845         else
2846                 pw = getpwnam(name);
2847         /*
2848          * Credentials specified as those of a user.
2849          */
2850         if (names == NULL) {
2851                 if (pw == NULL) {
2852                         syslog(LOG_ERR, "unknown user: %s", name);
2853                         return;
2854                 }
2855                 cr->cr_uid = pw->pw_uid;
2856                 ngroups = XU_NGROUPS + 1;
2857                 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups))
2858                         syslog(LOG_ERR, "too many groups");
2859                 /*
2860                  * Compress out duplicate.
2861                  */
2862                 cr->cr_ngroups = ngroups - 1;
2863                 cr->cr_groups[0] = groups[0];
2864                 for (cnt = 2; cnt < ngroups; cnt++)
2865                         cr->cr_groups[cnt - 1] = groups[cnt];
2866                 return;
2867         }
2868         /*
2869          * Explicit credential specified as a colon separated list:
2870          *      uid:gid:gid:...
2871          */
2872         if (pw != NULL)
2873                 cr->cr_uid = pw->pw_uid;
2874         else if (isdigit(*name) || *name == '-')
2875                 cr->cr_uid = atoi(name);
2876         else {
2877                 syslog(LOG_ERR, "unknown user: %s", name);
2878                 return;
2879         }
2880         cr->cr_ngroups = 0;
2881         while (names != NULL && *names != '\0' && cr->cr_ngroups < XU_NGROUPS) {
2882                 name = strsep(&names, ":");
2883                 if (isdigit(*name) || *name == '-') {
2884                         cr->cr_groups[cr->cr_ngroups++] = atoi(name);
2885                 } else {
2886                         if ((gr = getgrnam(name)) == NULL) {
2887                                 syslog(LOG_ERR, "unknown group: %s", name);
2888                                 continue;
2889                         }
2890                         cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid;
2891                 }
2892         }
2893         if (names != NULL && *names != '\0' && cr->cr_ngroups == XU_NGROUPS)
2894                 syslog(LOG_ERR, "too many groups");
2895 }
2896
2897 #define STRSIZ  (MNTNAMLEN+MNTPATHLEN+50)
2898 /*
2899  * Routines that maintain the remote mounttab
2900  */
2901 void
2902 get_mountlist(void)
2903 {
2904         struct mountlist *mlp, **mlpp;
2905         char *host, *dirp, *cp;
2906         char str[STRSIZ];
2907         FILE *mlfile;
2908
2909         if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) {
2910                 if (errno == ENOENT)
2911                         return;
2912                 else {
2913                         syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST);
2914                         return;
2915                 }
2916         }
2917         mlpp = &mlhead;
2918         while (fgets(str, STRSIZ, mlfile) != NULL) {
2919                 cp = str;
2920                 host = strsep(&cp, " \t\n");
2921                 dirp = strsep(&cp, " \t\n");
2922                 if (host == NULL || dirp == NULL)
2923                         continue;
2924                 mlp = (struct mountlist *)malloc(sizeof (*mlp));
2925                 if (mlp == (struct mountlist *)NULL)
2926                         out_of_mem();
2927                 strncpy(mlp->ml_host, host, MNTNAMLEN);
2928                 mlp->ml_host[MNTNAMLEN] = '\0';
2929                 strncpy(mlp->ml_dirp, dirp, MNTPATHLEN);
2930                 mlp->ml_dirp[MNTPATHLEN] = '\0';
2931                 mlp->ml_next = (struct mountlist *)NULL;
2932                 *mlpp = mlp;
2933                 mlpp = &mlp->ml_next;
2934         }
2935         fclose(mlfile);
2936 }
2937
2938 void
2939 del_mlist(char *hostp, char *dirp)
2940 {
2941         struct mountlist *mlp, **mlpp;
2942         struct mountlist *mlp2;
2943         FILE *mlfile;
2944         int fnd = 0;
2945
2946         mlpp = &mlhead;
2947         mlp = mlhead;
2948         while (mlp) {
2949                 if (!strcmp(mlp->ml_host, hostp) &&
2950                     (!dirp || !strcmp(mlp->ml_dirp, dirp))) {
2951                         fnd = 1;
2952                         mlp2 = mlp;
2953                         *mlpp = mlp = mlp->ml_next;
2954                         free((caddr_t)mlp2);
2955                 } else {
2956                         mlpp = &mlp->ml_next;
2957                         mlp = mlp->ml_next;
2958                 }
2959         }
2960         if (fnd) {
2961                 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) {
2962                         syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST);
2963                         return;
2964                 }
2965                 mlp = mlhead;
2966                 while (mlp) {
2967                         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
2968                         mlp = mlp->ml_next;
2969                 }
2970                 fclose(mlfile);
2971         }
2972 }
2973
2974 void
2975 add_mlist(char *hostp, char *dirp)
2976 {
2977         struct mountlist *mlp, **mlpp;
2978         FILE *mlfile;
2979
2980         mlpp = &mlhead;
2981         mlp = mlhead;
2982         while (mlp) {
2983                 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp))
2984                         return;
2985                 mlpp = &mlp->ml_next;
2986                 mlp = mlp->ml_next;
2987         }
2988         mlp = (struct mountlist *)malloc(sizeof (*mlp));
2989         if (mlp == (struct mountlist *)NULL)
2990                 out_of_mem();
2991         strncpy(mlp->ml_host, hostp, MNTNAMLEN);
2992         mlp->ml_host[MNTNAMLEN] = '\0';
2993         strncpy(mlp->ml_dirp, dirp, MNTPATHLEN);
2994         mlp->ml_dirp[MNTPATHLEN] = '\0';
2995         mlp->ml_next = (struct mountlist *)NULL;
2996         *mlpp = mlp;
2997         if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
2998                 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST);
2999                 return;
3000         }
3001         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
3002         fclose(mlfile);
3003 }
3004
3005 /*
3006  * Free up a group list.
3007  */
3008 void
3009 free_grp(struct grouplist *grp)
3010 {
3011         if (grp->gr_type == GT_HOST) {
3012                 if (grp->gr_ptr.gt_addrinfo != NULL)
3013                         freeaddrinfo(grp->gr_ptr.gt_addrinfo);
3014         } else if (grp->gr_type == GT_NET) {
3015                 if (grp->gr_ptr.gt_net.nt_name)
3016                         free(grp->gr_ptr.gt_net.nt_name);
3017         }
3018         free((caddr_t)grp);
3019 }
3020
3021 #ifdef DEBUG
3022 void
3023 SYSLOG(int pri, const char *fmt, ...)
3024 {
3025         va_list ap;
3026
3027         va_start(ap, fmt);
3028         vfprintf(stderr, fmt, ap);
3029         va_end(ap);
3030 }
3031 #endif /* DEBUG */
3032
3033 /*
3034  * Check options for consistency.
3035  */
3036 int
3037 check_options(struct dirlist *dp)
3038 {
3039
3040         if (v4root_phase == 0 && dp == NULL)
3041             return (1);
3042         if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL)) {
3043             syslog(LOG_ERR, "-mapall and -maproot mutually exclusive");
3044             return (1);
3045         }
3046         if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) {
3047                 syslog(LOG_ERR, "-mask requires -network");
3048                 return (1);
3049         }
3050         if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) {
3051                 syslog(LOG_ERR, "-network requires mask specification");
3052                 return (1);
3053         }
3054         if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) {
3055                 syslog(LOG_ERR, "-mask and /masklen are mutually exclusive");
3056                 return (1);
3057         }
3058         if (v4root_phase > 0 &&
3059             (opt_flags &
3060              ~(OP_SEC | OP_MASK | OP_NET | OP_HAVEMASK | OP_MASKLEN)) != 0) {
3061             syslog(LOG_ERR,"only -sec,-net,-mask options allowed on V4:");
3062             return (1);
3063         }
3064         if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
3065             syslog(LOG_ERR, "-alldirs has multiple directories");
3066             return (1);
3067         }
3068         return (0);
3069 }
3070
3071 /*
3072  * Check an absolute directory path for any symbolic links. Return true
3073  */
3074 int
3075 check_dirpath(char *dirp)
3076 {
3077         char *cp;
3078         int ret = 1;
3079         struct stat sb;
3080
3081         cp = dirp + 1;
3082         while (*cp && ret) {
3083                 if (*cp == '/') {
3084                         *cp = '\0';
3085                         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
3086                                 ret = 0;
3087                         *cp = '/';
3088                 }
3089                 cp++;
3090         }
3091         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
3092                 ret = 0;
3093         return (ret);
3094 }
3095
3096 /*
3097  * Make a netmask according to the specified prefix length. The ss_family
3098  * and other non-address fields must be initialised before calling this.
3099  */
3100 int
3101 makemask(struct sockaddr_storage *ssp, int bitlen)
3102 {
3103         u_char *p;
3104         int bits, i, len;
3105
3106         if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL)
3107                 return (-1);
3108         if (bitlen > len * CHAR_BIT)
3109                 return (-1);
3110
3111         for (i = 0; i < len; i++) {
3112                 bits = (bitlen > CHAR_BIT) ? CHAR_BIT : bitlen;
3113                 *p++ = (u_char)~0 << (CHAR_BIT - bits);
3114                 bitlen -= bits;
3115         }
3116         return 0;
3117 }
3118
3119 /*
3120  * Check that the sockaddr is a valid netmask. Returns 0 if the mask
3121  * is acceptable (i.e. of the form 1...10....0).
3122  */
3123 int
3124 checkmask(struct sockaddr *sa)
3125 {
3126         u_char *mask;
3127         int i, len;
3128
3129         if ((mask = sa_rawaddr(sa, &len)) == NULL)
3130                 return (-1);
3131
3132         for (i = 0; i < len; i++)
3133                 if (mask[i] != 0xff)
3134                         break;
3135         if (i < len) {
3136                 if (~mask[i] & (u_char)(~mask[i] + 1))
3137                         return (-1);
3138                 i++;
3139         }
3140         for (; i < len; i++)
3141                 if (mask[i] != 0)
3142                         return (-1);
3143         return (0);
3144 }
3145
3146 /*
3147  * Compare two sockaddrs according to a specified mask. Return zero if
3148  * `sa1' matches `sa2' when filtered by the netmask in `samask'.
3149  * If samask is NULL, perform a full comparision.
3150  */
3151 int
3152 sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask)
3153 {
3154         unsigned char *p1, *p2, *mask;
3155         int len, i;
3156
3157         if (sa1->sa_family != sa2->sa_family ||
3158             (p1 = sa_rawaddr(sa1, &len)) == NULL ||
3159             (p2 = sa_rawaddr(sa2, NULL)) == NULL)
3160                 return (1);
3161
3162         switch (sa1->sa_family) {
3163         case AF_INET6:
3164                 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
3165                     ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
3166                         return (1);
3167                 break;
3168         }
3169
3170         /* Simple binary comparison if no mask specified. */
3171         if (samask == NULL)
3172                 return (memcmp(p1, p2, len));
3173
3174         /* Set up the mask, and do a mask-based comparison. */
3175         if (sa1->sa_family != samask->sa_family ||
3176             (mask = sa_rawaddr(samask, NULL)) == NULL)
3177                 return (1);
3178
3179         for (i = 0; i < len; i++)
3180                 if ((p1[i] & mask[i]) != (p2[i] & mask[i]))
3181                         return (1);
3182         return (0);
3183 }
3184
3185 /*
3186  * Return a pointer to the part of the sockaddr that contains the
3187  * raw address, and set *nbytes to its length in bytes. Returns
3188  * NULL if the address family is unknown.
3189  */
3190 void *
3191 sa_rawaddr(struct sockaddr *sa, int *nbytes) {
3192         void *p;
3193         int len;
3194
3195         switch (sa->sa_family) {
3196         case AF_INET:
3197                 len = sizeof(((struct sockaddr_in *)sa)->sin_addr);
3198                 p = &((struct sockaddr_in *)sa)->sin_addr;
3199                 break;
3200         case AF_INET6:
3201                 len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr);
3202                 p = &((struct sockaddr_in6 *)sa)->sin6_addr;
3203                 break;
3204         default:
3205                 p = NULL;
3206                 len = 0;
3207         }
3208
3209         if (nbytes != NULL)
3210                 *nbytes = len;
3211         return (p);
3212 }
3213
3214 void
3215 huphandler(int sig __unused)
3216 {
3217         got_sighup = 1;
3218 }
3219
3220 void terminate(int sig __unused)
3221 {
3222         pidfile_remove(pfh);
3223         rpcb_unset(MOUNTPROG, MOUNTVERS, NULL);
3224         rpcb_unset(MOUNTPROG, MOUNTVERS3, NULL);
3225         exit (0);
3226 }
3227