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