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 };
 121 /* ex_flag bits */
 122 #define EX_LINKED       0x1
 123
 124 struct netmsk {
 125         struct sockaddr_storage nt_net;
 126         struct sockaddr_storage nt_mask;
 127         char            *nt_name;
 128 };
 129
 130 union grouptypes {
 131         struct addrinfo *gt_addrinfo;
 132         struct netmsk   gt_net;
 133 };
 134
 135 struct grouplist {
 136         int gr_type;
 137         union grouptypes gr_ptr;
 138         struct grouplist *gr_next;
 139 };
 140 /* Group types */
 141 #define GT_NULL         0x0
 142 #define GT_HOST         0x1
 143 #define GT_NET          0x2
 144 #define GT_DEFAULT      0x3
 145 #define GT_IGNORE       0x5
 146
 147 struct hostlist {
 148         int              ht_flag;       /* Uses DP_xx bits */
 149         struct grouplist *ht_grp;
 150         struct hostlist  *ht_next;
 151 };
 152
 153 struct fhreturn {
 154         int     fhr_flag;
 155         int     fhr_vers;
 156         nfsfh_t fhr_fh;
 157         int     fhr_numsecflavors;
 158         int     *fhr_secflavors;
 159 };
 160
 161 #define GETPORT_MAXTRY  20      /* Max tries to get a port # */
 162
 163 /* Global defs */
 164 char    *add_expdir(struct dirlist **, char *, int);
 165 void    add_dlist(struct dirlist **, struct dirlist *,
 166                                 struct grouplist *, int);
 167 void    add_mlist(char *, char *);
 168 int     check_dirpath(char *);
 169 int     check_options(struct dirlist *);
 170 int     checkmask(struct sockaddr *sa);
 171 int     chk_host(struct dirlist *, struct sockaddr *, int *, int *);
 172 static int      create_service(struct netconfig *nconf);
 173 static void     complete_service(struct netconfig *nconf, char *port_str);
 174 static void     clearout_service(void);
 175 void    del_mlist(char *hostp, char *dirp);
 176 struct dirlist *dirp_search(struct dirlist *, char *);
 177 int     do_mount(struct exportlist *, struct grouplist *, int,
 178                 struct xucred *, char *, int, struct statfs *);
 179 int     do_opt(char **, char **, struct exportlist *, struct grouplist *,
 180                                 int *, int *, struct xucred *);
 181 struct  exportlist *ex_search(fsid_t *);
 182 struct  exportlist *get_exp(void);
 183 void    free_dir(struct dirlist *);
 184 void    free_exp(struct exportlist *);
 185 void    free_grp(struct grouplist *);
 186 void    free_host(struct hostlist *);
 187 void    get_exportlist(void);
 188 int     get_host(char *, struct grouplist *, struct grouplist *);
 189 struct hostlist *get_ht(void);
 190 int     get_line(void);
 191 void    get_mountlist(void);
 192 int     get_net(char *, struct netmsk *, int);
 193 void    getexp_err(struct exportlist *, struct grouplist *);
 194 struct grouplist *get_grp(void);
 195 void    hang_dirp(struct dirlist *, struct grouplist *,
 196                                 struct exportlist *, int);
 197 void    huphandler(int sig);
 198 int     makemask(struct sockaddr_storage *ssp, int bitlen);
 199 void    mntsrv(struct svc_req *, SVCXPRT *);
 200 void    nextfield(char **, char **);
 201 void    out_of_mem(void);
 202 void    parsecred(char *, struct xucred *);
 203 int     parsesec(char *, struct exportlist *);
 204 int     put_exlist(struct dirlist *, XDR *, struct dirlist *, int *, int);
 205 void    *sa_rawaddr(struct sockaddr *sa, int *nbytes);
 206 int     sacmp(struct sockaddr *sa1, struct sockaddr *sa2,
 207     struct sockaddr *samask);
 208 int     scan_tree(struct dirlist *, struct sockaddr *);
 209 static void usage(void);
 210 int     xdr_dir(XDR *, char *);
 211 int     xdr_explist(XDR *, caddr_t);
 212 int     xdr_explist_brief(XDR *, caddr_t);
 213 int     xdr_explist_common(XDR *, caddr_t, int);
 214 int     xdr_fhs(XDR *, caddr_t);
 215 int     xdr_mlist(XDR *, caddr_t);
 216 void    terminate(int);
 217
 218 struct exportlist *exphead;
 219 struct mountlist *mlhead;
 220 struct grouplist *grphead;
 221 char *exnames_default[2] = { _PATH_EXPORTS, NULL };
 222 char **exnames;
 223 char **hosts = NULL;
 224 struct xucred def_anon = {
 225         XUCRED_VERSION,
 226         (uid_t)-2,
 227         1,
 228         { (gid_t)-2 },
 229         NULL
 230 };
 231 int force_v2 = 0;
 232 int resvport_only = 1;
 233 int nhosts = 0;
 234 int dir_only = 1;
 235 int dolog = 0;
 236 int got_sighup = 0;
 237 int xcreated = 0;
 238
 239 char *svcport_str = NULL;
 240 static int      mallocd_svcport = 0;
 241 static int      *sock_fd;
 242 static int      sock_fdcnt;
 243 static int      sock_fdpos;
 244
 245 int opt_flags;
 246 static int have_v6 = 1;
 247
 248 int v4root_phase = 0;
 249 char v4root_dirpath[PATH_MAX + 1];
 250 int run_v4server = 1;
 251 int has_publicfh = 0;
 252
 253 struct pidfh *pfh = NULL;
 254 /* Bits for opt_flags above */
 255 #define OP_MAPROOT      0x01
 256 #define OP_MAPALL       0x02
 257 /* 0x4 free */
 258 #define OP_MASK         0x08
 259 #define OP_NET          0x10
 260 #define OP_ALLDIRS      0x40
 261 #define OP_HAVEMASK     0x80    /* A mask was specified or inferred. */
 262 #define OP_QUIET        0x100
 263 #define OP_MASKLEN      0x200
 264 #define OP_SEC          0x400
 265
 266 #ifdef DEBUG
 267 int debug = 1;
 268 void    SYSLOG(int, const char *, ...) __printflike(2, 3);
 269 #define syslog SYSLOG
 270 #else
 271 int debug = 0;
 272 #endif
 273
 274 /*
 275  * Mountd server for NFS mount protocol as described in:
 276  * NFS: Network File System Protocol Specification, RFC1094, Appendix A
 277  * The optional arguments are the exports file name
 278  * default: _PATH_EXPORTS
 279  * and "-n" to allow nonroot mount.
 280  */
 281 int
 282 main(int argc, char **argv)
 283 {
 284         fd_set readfds;
 285         struct netconfig *nconf;
 286         char *endptr, **hosts_bak;
 287         void *nc_handle;
 288         pid_t otherpid;
 289         in_port_t svcport;
 290         int c, k, s;
 291         int maxrec = RPC_MAXDATASIZE;
 292         int attempt_cnt, port_len, port_pos, ret;
 293         char **port_list;
 294
 295         /* Check that another mountd isn't already running. */
 296         pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &otherpid);
 297         if (pfh == NULL) {
 298                 if (errno == EEXIST)
 299                         errx(1, "mountd already running, pid: %d.", otherpid);
 300                 warn("cannot open or create pidfile");
 301         }
 302
 303         s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
 304         if (s < 0)
 305                 have_v6 = 0;
 306         else
 307                 close(s);
 308
 309         while ((c = getopt(argc, argv, "2deh:lnop:r")) != -1)
 310                 switch (c) {
 311                 case '2':
 312                         force_v2 = 1;
 313                         break;
 314                 case 'e':
 315                         /* now a no-op, since this is the default */
 316                         break;
 317                 case 'n':
 318                         resvport_only = 0;
 319                         break;
 320                 case 'r':
 321                         dir_only = 0;
 322                         break;
 323                 case 'd':
 324                         debug = debug ? 0 : 1;
 325                         break;
 326                 case 'l':
 327                         dolog = 1;
 328                         break;
 329                 case 'o':
 330                         run_v4server = 0;
 331                         break;
 332                 case 'p':
 333                         endptr = NULL;
 334                         svcport = (in_port_t)strtoul(optarg, &endptr, 10);
 335                         if (endptr == NULL || *endptr != '\0' ||
 336                             svcport == 0 || svcport >= IPPORT_MAX)
 337                                 usage();
 338                         svcport_str = strdup(optarg);
 339                         break;
 340                 case 'h':
 341                         ++nhosts;
 342                         hosts_bak = hosts;
 343                         hosts_bak = realloc(hosts, nhosts * sizeof(char *));
 344                         if (hosts_bak == NULL) {
 345                                 if (hosts != NULL) {
 346                                         for (k = 0; k < nhosts; k++)
 347                                                 free(hosts[k]);
 348                                         free(hosts);
 349                                         out_of_mem();
 350                                 }
 351                         }
 352                         hosts = hosts_bak;
 353                         hosts[nhosts - 1] = strdup(optarg);
 354                         if (hosts[nhosts - 1] == NULL) {
 355                                 for (k = 0; k < (nhosts - 1); k++)
 356                                         free(hosts[k]);
 357                                 free(hosts);
 358                                 out_of_mem();
 359                         }
 360                         break;
 361                 default:
 362                         usage();
 363                 };
 364
 365         /*
 366          * Unless the "-o" option was specified, try and run "nfsd".
 367          * If "-o" was specified, try and run "nfsserver".
 368          */
 369         if (run_v4server > 0) {
 370                 if (modfind("nfsd") < 0) {
 371                         /* Not present in kernel, try loading it */
 372                         if (kldload("nfsd") < 0 || modfind("nfsd") < 0)
 373                                 errx(1, "NFS server is not available");
 374                 }
 375         } else if (modfind("nfsserver") < 0) {
 376                 /* Not present in kernel, try loading it */
 377                 if (kldload("nfsserver") < 0 || modfind("nfsserver") < 0)
 378                         errx(1, "NFS server is not available");
 379         }
 380
 381         argc -= optind;
 382         argv += optind;
 383         grphead = (struct grouplist *)NULL;
 384         exphead = (struct exportlist *)NULL;
 385         mlhead = (struct mountlist *)NULL;
 386         if (argc > 0)
 387                 exnames = argv;
 388         else
 389                 exnames = exnames_default;
 390         openlog("mountd", LOG_PID, LOG_DAEMON);
 391         if (debug)
 392                 warnx("getting export list");
 393         get_exportlist();
 394         if (debug)
 395                 warnx("getting mount list");
 396         get_mountlist();
 397         if (debug)
 398                 warnx("here we go");
 399         if (debug == 0) {
 400                 daemon(0, 0);
 401                 signal(SIGINT, SIG_IGN);
 402                 signal(SIGQUIT, SIG_IGN);
 403         }
 404         signal(SIGHUP, huphandler);
 405         signal(SIGTERM, terminate);
 406         signal(SIGPIPE, SIG_IGN);
 407
 408         pidfile_write(pfh);
 409
 410         rpcb_unset(MOUNTPROG, MOUNTVERS, NULL);
 411         rpcb_unset(MOUNTPROG, MOUNTVERS3, NULL);
 412         rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);
 413
 414         if (!resvport_only) {
 415                 if (sysctlbyname("vfs.nfsrv.nfs_privport", NULL, NULL,
 416                     &resvport_only, sizeof(resvport_only)) != 0 &&
 417                     errno != ENOENT) {
 418                         syslog(LOG_ERR, "sysctl: %m");
 419                         exit(1);
 420                 }
 421         }
 422
 423         /*
 424          * If no hosts were specified, add a wildcard entry to bind to
 425          * INADDR_ANY. Otherwise make sure 127.0.0.1 and ::1 are added to the
 426          * list.
 427          */
 428         if (nhosts == 0) {
 429                 hosts = malloc(sizeof(char**));
 430                 if (hosts == NULL)
 431                         out_of_mem();
 432                 hosts[0] = "*";
 433                 nhosts = 1;
 434         } else {
 435                 hosts_bak = hosts;
 436                 if (have_v6) {
 437                         hosts_bak = realloc(hosts, (nhosts + 2) *
 438                             sizeof(char *));
 439                         if (hosts_bak == NULL) {
 440                                 for (k = 0; k < nhosts; k++)
 441                                         free(hosts[k]);
 442                                 free(hosts);
 443                                 out_of_mem();
 444                         } else
 445                                 hosts = hosts_bak;
 446                         nhosts += 2;
 447                         hosts[nhosts - 2] = "::1";
 448                 } else {
 449                         hosts_bak = realloc(hosts, (nhosts + 1) * sizeof(char *));
 450                         if (hosts_bak == NULL) {
 451                                 for (k = 0; k < nhosts; k++)
 452                                         free(hosts[k]);
 453                                 free(hosts);
 454                                 out_of_mem();
 455                         } else {
 456                                 nhosts += 1;
 457                                 hosts = hosts_bak;
 458                         }
 459                 }
 460
 461                 hosts[nhosts - 1] = "127.0.0.1";
 462         }
 463
 464         attempt_cnt = 1;
 465         sock_fdcnt = 0;
 466         sock_fd = NULL;
 467         port_list = NULL;
 468         port_len = 0;
 469         nc_handle = setnetconfig();
 470         while ((nconf = getnetconfig(nc_handle))) {
 471                 if (nconf->nc_flag & NC_VISIBLE) {
 472                         if (have_v6 == 0 && strcmp(nconf->nc_protofmly,
 473                             "inet6") == 0) {
 474                                 /* DO NOTHING */
 475                         } else {
 476                                 ret = create_service(nconf);
 477                                 if (ret == 1)
 478                                         /* Ignore this call */
 479                                         continue;
 480                                 if (ret < 0) {
 481                                         /*
 482                                          * Failed to bind port, so close off
 483                                          * all sockets created and try again
 484                                          * if the port# was dynamically
 485                                          * assigned via bind(2).
 486                                          */
 487                                         clearout_service();
 488                                         if (mallocd_svcport != 0 &&
 489                                             attempt_cnt < GETPORT_MAXTRY) {
 490                                                 free(svcport_str);
 491                                                 svcport_str = NULL;
 492                                                 mallocd_svcport = 0;
 493                                         } else {
 494                                                 errno = EADDRINUSE;
 495                                                 syslog(LOG_ERR,
 496                                                     "bindresvport_sa: %m");
 497                                                 exit(1);
 498                                         }
 499
 500                                         /* Start over at the first service. */
 501                                         free(sock_fd);
 502                                         sock_fdcnt = 0;
 503                                         sock_fd = NULL;
 504                                         nc_handle = setnetconfig();
 505                                         attempt_cnt++;
 506                                 } else if (mallocd_svcport != 0 &&
 507                                     attempt_cnt == GETPORT_MAXTRY) {
 508                                         /*
 509                                          * For the last attempt, allow
 510                                          * different port #s for each nconf
 511                                          * by saving the svcport_str and
 512                                          * setting it back to NULL.
 513                                          */
 514                                         port_list = realloc(port_list,
 515                                             (port_len + 1) * sizeof(char *));
 516                                         if (port_list == NULL)
 517                                                 out_of_mem();
 518                                         port_list[port_len++] = svcport_str;
 519                                         svcport_str = NULL;
 520                                         mallocd_svcport = 0;
 521                                 }
 522                         }
 523                 }
 524         }
 525
 526         /*
 527          * Successfully bound the ports, so call complete_service() to
 528          * do the rest of the setup on the service(s).
 529          */
 530         sock_fdpos = 0;
 531         port_pos = 0;
 532         nc_handle = setnetconfig();
 533         while ((nconf = getnetconfig(nc_handle))) {
 534                 if (nconf->nc_flag & NC_VISIBLE) {
 535                         if (have_v6 == 0 && strcmp(nconf->nc_protofmly,
 536                             "inet6") == 0) {
 537                                 /* DO NOTHING */
 538                         } else if (port_list != NULL) {
 539                                 if (port_pos >= port_len) {
 540                                         syslog(LOG_ERR, "too many port#s");
 541                                         exit(1);
 542                                 }
 543                                 complete_service(nconf, port_list[port_pos++]);
 544                         } else
 545                                 complete_service(nconf, svcport_str);
 546                 }
 547         }
 548         endnetconfig(nc_handle);
 549         free(sock_fd);
 550         if (port_list != NULL) {
 551                 for (port_pos = 0; port_pos < port_len; port_pos++)
 552                         free(port_list[port_pos]);
 553                 free(port_list);
 554         }
 555
 556         if (xcreated == 0) {
 557                 syslog(LOG_ERR, "could not create any services");
 558                 exit(1);
 559         }
 560
 561         /* Expand svc_run() here so that we can call get_exportlist(). */
 562         for (;;) {
 563                 if (got_sighup) {
 564                         get_exportlist();
 565                         got_sighup = 0;
 566                 }
 567                 readfds = svc_fdset;
 568                 switch (select(svc_maxfd + 1, &readfds, NULL, NULL, NULL)) {
 569                 case -1:
 570                         if (errno == EINTR)
 571                                 continue;
 572                         syslog(LOG_ERR, "mountd died: select: %m");
 573                         exit(1);
 574                 case 0:
 575                         continue;
 576                 default:
 577                         svc_getreqset(&readfds);
 578                 }
 579         }
 580 }
 581
 582 /*
 583  * This routine creates and binds sockets on the appropriate
 584  * addresses. It gets called one time for each transport.
 585  * It returns 0 upon success, 1 for ingore the call and -1 to indicate
 586  * bind failed with EADDRINUSE.
 587  * Any file descriptors that have been created are stored in sock_fd and
 588  * the total count of them is maintained in sock_fdcnt.
 589  */
 590 static int
 591 create_service(struct netconfig *nconf)
 592 {
 593         struct addrinfo hints, *res = NULL;
 594         struct sockaddr_in *sin;
 595         struct sockaddr_in6 *sin6;
 596         struct __rpc_sockinfo si;
 597         int aicode;
 598         int fd;
 599         int nhostsbak;
 600         int one = 1;
 601         int r;
 602         u_int32_t host_addr[4];  /* IPv4 or IPv6 */
 603         int mallocd_res;
 604
 605         if ((nconf->nc_semantics != NC_TPI_CLTS) &&
 606             (nconf->nc_semantics != NC_TPI_COTS) &&
 607             (nconf->nc_semantics != NC_TPI_COTS_ORD))
 608                 return (1);     /* not my type */
 609
 610         /*
 611          * XXX - using RPC library internal functions.
 612          */
 613         if (!__rpc_nconf2sockinfo(nconf, &si)) {
 614                 syslog(LOG_ERR, "cannot get information for %s",
 615                     nconf->nc_netid);
 616                 return (1);
 617         }
 618
 619         /* Get mountd's address on this transport */
 620         memset(&hints, 0, sizeof hints);
 621         hints.ai_flags = AI_PASSIVE;
 622         hints.ai_family = si.si_af;
 623         hints.ai_socktype = si.si_socktype;
 624         hints.ai_protocol = si.si_proto;
 625
 626         /*
 627          * Bind to specific IPs if asked to
 628          */
 629         nhostsbak = nhosts;
 630         while (nhostsbak > 0) {
 631                 --nhostsbak;
 632                 sock_fd = realloc(sock_fd, (sock_fdcnt + 1) * sizeof(int));
 633                 if (sock_fd == NULL)
 634                         out_of_mem();
 635                 sock_fd[sock_fdcnt++] = -1;     /* Set invalid for now. */
 636                 mallocd_res = 0;
 637
 638                 /*
 639                  * XXX - using RPC library internal functions.
 640                  */
 641                 if ((fd = __rpc_nconf2fd(nconf)) < 0) {
 642                         int non_fatal = 0;
 643                         if (errno == EPROTONOSUPPORT &&
 644                             nconf->nc_semantics != NC_TPI_CLTS)
 645                                 non_fatal = 1;
 646
 647                         syslog(non_fatal ? LOG_DEBUG : LOG_ERR,
 648                             "cannot create socket for %s", nconf->nc_netid);
 649                         if (non_fatal != 0)
 650                                 continue;
 651                         exit(1);
 652                 }
 653
 654                 switch (hints.ai_family) {
 655                 case AF_INET:
 656                         if (inet_pton(AF_INET, hosts[nhostsbak],
 657                             host_addr) == 1) {
 658                                 hints.ai_flags |= AI_NUMERICHOST;
 659                         } else {
 660                                 /*
 661                                  * Skip if we have an AF_INET6 address.
 662                                  */
 663                                 if (inet_pton(AF_INET6, hosts[nhostsbak],
 664                                     host_addr) == 1) {
 665                                         close(fd);
 666                                         continue;
 667                                 }
 668                         }
 669                         break;
 670                 case AF_INET6:
 671                         if (inet_pton(AF_INET6, hosts[nhostsbak],
 672                             host_addr) == 1) {
 673                                 hints.ai_flags |= AI_NUMERICHOST;
 674                         } else {
 675                                 /*
 676                                  * Skip if we have an AF_INET address.
 677                                  */
 678                                 if (inet_pton(AF_INET, hosts[nhostsbak],
 679                                     host_addr) == 1) {
 680                                         close(fd);
 681                                         continue;
 682                                 }
 683                         }
 684
 685                         /*
 686                          * We're doing host-based access checks here, so don't
 687                          * allow v4-in-v6 to confuse things. The kernel will
 688                          * disable it by default on NFS sockets too.
 689                          */
 690                         if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one,
 691                             sizeof one) < 0) {
 692                                 syslog(LOG_ERR,
 693                                     "can't disable v4-in-v6 on IPv6 socket");
 694                                 exit(1);
 695                         }
 696                         break;
 697                 default:
 698                         break;
 699                 }
 700
 701                 /*
 702                  * If no hosts were specified, just bind to INADDR_ANY
 703                  */
 704                 if (strcmp("*", hosts[nhostsbak]) == 0) {
 705                         if (svcport_str == NULL) {
 706                                 res = malloc(sizeof(struct addrinfo));
 707                                 if (res == NULL)
 708                                         out_of_mem();
 709                                 mallocd_res = 1;
 710                                 res->ai_flags = hints.ai_flags;
 711                                 res->ai_family = hints.ai_family;
 712                                 res->ai_protocol = hints.ai_protocol;
 713                                 switch (res->ai_family) {
 714                                 case AF_INET:
 715                                         sin = malloc(sizeof(struct sockaddr_in));
 716                                         if (sin == NULL)
 717                                                 out_of_mem();
 718                                         sin->sin_family = AF_INET;
 719                                         sin->sin_port = htons(0);
 720                                         sin->sin_addr.s_addr = htonl(INADDR_ANY);
 721                                         res->ai_addr = (struct sockaddr*) sin;
 722                                         res->ai_addrlen = (socklen_t)
 723                                             sizeof(struct sockaddr_in);
 724                                         break;
 725                                 case AF_INET6:
 726                                         sin6 = malloc(sizeof(struct sockaddr_in6));
 727                                         if (sin6 == NULL)
 728                                                 out_of_mem();
 729                                         sin6->sin6_family = AF_INET6;
 730                                         sin6->sin6_port = htons(0);
 731                                         sin6->sin6_addr = in6addr_any;
 732                                         res->ai_addr = (struct sockaddr*) sin6;
 733                                         res->ai_addrlen = (socklen_t)
 734                                             sizeof(struct sockaddr_in6);
 735                                         break;
 736                                 default:
 737                                         syslog(LOG_ERR, "bad addr fam %d",
 738                                             res->ai_family);
 739                                         exit(1);
 740                                 }
 741                         } else {
 742                                 if ((aicode = getaddrinfo(NULL, svcport_str,
 743                                     &hints, &res)) != 0) {
 744                                         syslog(LOG_ERR,
 745                                             "cannot get local address for %s: %s",
 746                                             nconf->nc_netid,
 747                                             gai_strerror(aicode));
 748                                         close(fd);
 749                                         continue;
 750                                 }
 751                         }
 752                 } else {
 753                         if ((aicode = getaddrinfo(hosts[nhostsbak], svcport_str,
 754                             &hints, &res)) != 0) {
 755                                 syslog(LOG_ERR,
 756                                     "cannot get local address for %s: %s",
 757                                     nconf->nc_netid, gai_strerror(aicode));
 758                                 close(fd);
 759                                 continue;
 760                         }
 761                 }
 762
 763                 /* Store the fd. */
 764                 sock_fd[sock_fdcnt - 1] = fd;
 765
 766                 /* Now, attempt the bind. */
 767                 r = bindresvport_sa(fd, res->ai_addr);
 768                 if (r != 0) {
 769                         if (errno == EADDRINUSE && mallocd_svcport != 0) {
 770                                 if (mallocd_res != 0) {
 771                                         free(res->ai_addr);
 772                                         free(res);
 773                                 } else
 774                                         freeaddrinfo(res);
 775                                 return (-1);
 776                         }
 777                         syslog(LOG_ERR, "bindresvport_sa: %m");
 778                         exit(1);
 779                 }
 780
 781                 if (svcport_str == NULL) {
 782                         svcport_str = malloc(NI_MAXSERV * sizeof(char));
 783                         if (svcport_str == NULL)
 784                                 out_of_mem();
 785                         mallocd_svcport = 1;
 786
 787                         if (getnameinfo(res->ai_addr,
 788                             res->ai_addr->sa_len, NULL, NI_MAXHOST,
 789                             svcport_str, NI_MAXSERV * sizeof(char),
 790                             NI_NUMERICHOST | NI_NUMERICSERV))
 791                                 errx(1, "Cannot get port number");
 792                 }
 793                 if (mallocd_res != 0) {
 794                         free(res->ai_addr);
 795                         free(res);
 796                 } else
 797                         freeaddrinfo(res);
 798                 res = NULL;
 799         }
 800         return (0);
 801 }
 802
 803 /*
 804  * Called after all the create_service() calls have succeeded, to complete
 805  * the setup and registration.
 806  */
 807 static void
 808 complete_service(struct netconfig *nconf, char *port_str)
 809 {
 810         struct addrinfo hints, *res = NULL;
 811         struct __rpc_sockinfo si;
 812         struct netbuf servaddr;
 813         SVCXPRT *transp = NULL;
 814         int aicode, fd, nhostsbak;
 815         int registered = 0;
 816
 817         if ((nconf->nc_semantics != NC_TPI_CLTS) &&
 818             (nconf->nc_semantics != NC_TPI_COTS) &&
 819             (nconf->nc_semantics != NC_TPI_COTS_ORD))
 820                 return; /* not my type */
 821
 822         /*
 823          * XXX - using RPC library internal functions.
 824          */
 825         if (!__rpc_nconf2sockinfo(nconf, &si)) {
 826                 syslog(LOG_ERR, "cannot get information for %s",
 827                     nconf->nc_netid);
 828                 return;
 829         }
 830
 831         nhostsbak = nhosts;
 832         while (nhostsbak > 0) {
 833                 --nhostsbak;
 834                 if (sock_fdpos >= sock_fdcnt) {
 835                         /* Should never happen. */
 836                         syslog(LOG_ERR, "Ran out of socket fd's");
 837                         return;
 838                 }
 839                 fd = sock_fd[sock_fdpos++];
 840                 if (fd < 0)
 841                         continue;
 842
 843                 if (nconf->nc_semantics != NC_TPI_CLTS)
 844                         listen(fd, SOMAXCONN);
 845
 846                 if (nconf->nc_semantics == NC_TPI_CLTS )
 847                         transp = svc_dg_create(fd, 0, 0);
 848                 else
 849                         transp = svc_vc_create(fd, RPC_MAXDATASIZE,
 850                             RPC_MAXDATASIZE);
 851
 852                 if (transp != (SVCXPRT *) NULL) {
 853                         if (!svc_reg(transp, MOUNTPROG, MOUNTVERS, mntsrv,
 854                             NULL))
 855                                 syslog(LOG_ERR,
 856                                     "can't register %s MOUNTVERS service",
 857                                     nconf->nc_netid);
 858                         if (!force_v2) {
 859                                 if (!svc_reg(transp, MOUNTPROG, MOUNTVERS3,
 860                                     mntsrv, NULL))
 861                                         syslog(LOG_ERR,
 862                                             "can't register %s MOUNTVERS3 service",
 863                                             nconf->nc_netid);
 864                         }
 865                 } else
 866                         syslog(LOG_WARNING, "can't create %s services",
 867                             nconf->nc_netid);
 868
 869                 if (registered == 0) {
 870                         registered = 1;
 871                         memset(&hints, 0, sizeof hints);
 872                         hints.ai_flags = AI_PASSIVE;
 873                         hints.ai_family = si.si_af;
 874                         hints.ai_socktype = si.si_socktype;
 875                         hints.ai_protocol = si.si_proto;
 876
 877                         if ((aicode = getaddrinfo(NULL, port_str, &hints,
 878                             &res)) != 0) {
 879                                 syslog(LOG_ERR, "cannot get local address: %s",
 880                                     gai_strerror(aicode));
 881                                 exit(1);
 882                         }
 883
 884                         servaddr.buf = malloc(res->ai_addrlen);
 885                         memcpy(servaddr.buf, res->ai_addr, res->ai_addrlen);
 886                         servaddr.len = res->ai_addrlen;
 887
 888                         rpcb_set(MOUNTPROG, MOUNTVERS, nconf, &servaddr);
 889                         rpcb_set(MOUNTPROG, MOUNTVERS3, nconf, &servaddr);
 890
 891                         xcreated++;
 892                         freeaddrinfo(res);
 893                 }
 894         } /* end while */
 895 }
 896
 897 /*
 898  * Clear out sockets after a failure to bind one of them, so that the
 899  * cycle of socket creation/binding can start anew.
 900  */
 901 static void
 902 clearout_service(void)
 903 {
 904         int i;
 905
 906         for (i = 0; i < sock_fdcnt; i++) {
 907                 if (sock_fd[i] >= 0) {
 908                         shutdown(sock_fd[i], SHUT_RDWR);
 909                         close(sock_fd[i]);
 910                 }
 911         }
 912 }
 913
 914 static void
 915 usage(void)
 916 {
 917         fprintf(stderr,
 918                 "usage: mountd [-2] [-d] [-e] [-l] [-n] [-p <port>] [-r] "
 919                 "[-h <bindip>] [export_file ...]\n");
 920         exit(1);
 921 }
 922
 923 /*
 924  * The mount rpc service
 925  */
 926 void
 927 mntsrv(struct svc_req *rqstp, SVCXPRT *transp)
 928 {
 929         struct exportlist *ep;
 930         struct dirlist *dp;
 931         struct fhreturn fhr;
 932         struct stat stb;
 933         struct statfs fsb;
 934         char host[NI_MAXHOST], numerichost[NI_MAXHOST];
 935         int lookup_failed = 1;
 936         struct sockaddr *saddr;
 937         u_short sport;
 938         char rpcpath[MNTPATHLEN + 1], dirpath[MAXPATHLEN];
 939         int bad = 0, defset, hostset;
 940         sigset_t sighup_mask;
 941
 942         sigemptyset(&sighup_mask);
 943         sigaddset(&sighup_mask, SIGHUP);
 944         saddr = svc_getrpccaller(transp)->buf;
 945         switch (saddr->sa_family) {
 946         case AF_INET6:
 947                 sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port);
 948                 break;
 949         case AF_INET:
 950                 sport = ntohs(((struct sockaddr_in *)saddr)->sin_port);
 951                 break;
 952         default:
 953                 syslog(LOG_ERR, "request from unknown address family");
 954                 return;
 955         }
 956         lookup_failed = getnameinfo(saddr, saddr->sa_len, host, sizeof host,
 957             NULL, 0, 0);
 958         getnameinfo(saddr, saddr->sa_len, numerichost,
 959             sizeof numerichost, NULL, 0, NI_NUMERICHOST);
 960         switch (rqstp->rq_proc) {
 961         case NULLPROC:
 962                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
 963                         syslog(LOG_ERR, "can't send reply");
 964                 return;
 965         case MOUNTPROC_MNT:
 966                 if (sport >= IPPORT_RESERVED && resvport_only) {
 967                         syslog(LOG_NOTICE,
 968                             "mount request from %s from unprivileged port",
 969                             numerichost);
 970                         svcerr_weakauth(transp);
 971                         return;
 972                 }
 973                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
 974                         syslog(LOG_NOTICE, "undecodable mount request from %s",
 975                             numerichost);
 976                         svcerr_decode(transp);
 977                         return;
 978                 }
 979
 980                 /*
 981                  * Get the real pathname and make sure it is a directory
 982                  * or a regular file if the -r option was specified
 983                  * and it exists.
 984                  */
 985                 if (realpath(rpcpath, dirpath) == NULL ||
 986                     stat(dirpath, &stb) < 0 ||
 987                     (!S_ISDIR(stb.st_mode) &&
 988                     (dir_only || !S_ISREG(stb.st_mode))) ||
 989                     statfs(dirpath, &fsb) < 0) {
 990                         chdir("/");     /* Just in case realpath doesn't */
 991                         syslog(LOG_NOTICE,
 992                             "mount request from %s for non existent path %s",
 993                             numerichost, dirpath);
 994                         if (debug)
 995                                 warnx("stat failed on %s", dirpath);
 996                         bad = ENOENT;   /* We will send error reply later */
 997                 }
 998
 999                 /* Check in the exports list */
1000                 sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
1001                 ep = ex_search(&fsb.f_fsid);
1002                 hostset = defset = 0;
1003                 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset) ||
1004                     ((dp = dirp_search(ep->ex_dirl, dirpath)) &&
1005                       chk_host(dp, saddr, &defset, &hostset)) ||
1006                     (defset && scan_tree(ep->ex_defdir, saddr) == 0 &&
1007                      scan_tree(ep->ex_dirl, saddr) == 0))) {
1008                         if (bad) {
1009                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
1010                                     (caddr_t)&bad))
1011                                         syslog(LOG_ERR, "can't send reply");
1012                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1013                                 return;
1014                         }
1015                         if (hostset & DP_HOSTSET)
1016                                 fhr.fhr_flag = hostset;
1017                         else
1018                                 fhr.fhr_flag = defset;
1019                         fhr.fhr_vers = rqstp->rq_vers;
1020                         /* Get the file handle */
1021                         memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t));
1022                         if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) {
1023                                 bad = errno;
1024                                 syslog(LOG_ERR, "can't get fh for %s", dirpath);
1025                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
1026                                     (caddr_t)&bad))
1027                                         syslog(LOG_ERR, "can't send reply");
1028                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1029                                 return;
1030                         }
1031                         fhr.fhr_numsecflavors = ep->ex_numsecflavors;
1032                         fhr.fhr_secflavors = ep->ex_secflavors;
1033                         if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs,
1034                             (caddr_t)&fhr))
1035                                 syslog(LOG_ERR, "can't send reply");
1036                         if (!lookup_failed)
1037                                 add_mlist(host, dirpath);
1038                         else
1039                                 add_mlist(numerichost, dirpath);
1040                         if (debug)
1041                                 warnx("mount successful");
1042                         if (dolog)
1043                                 syslog(LOG_NOTICE,
1044                                     "mount request succeeded from %s for %s",
1045                                     numerichost, dirpath);
1046                 } else {
1047                         bad = EACCES;
1048                         syslog(LOG_NOTICE,
1049                             "mount request denied from %s for %s",
1050                             numerichost, dirpath);
1051                 }
1052
1053                 if (bad && !svc_sendreply(transp, (xdrproc_t)xdr_long,
1054                     (caddr_t)&bad))
1055                         syslog(LOG_ERR, "can't send reply");
1056                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1057                 return;
1058         case MOUNTPROC_DUMP:
1059                 if (!svc_sendreply(transp, (xdrproc_t)xdr_mlist, (caddr_t)NULL))
1060                         syslog(LOG_ERR, "can't send reply");
1061                 else if (dolog)
1062                         syslog(LOG_NOTICE,
1063                             "dump request succeeded from %s",
1064                             numerichost);
1065                 return;
1066         case MOUNTPROC_UMNT:
1067                 if (sport >= IPPORT_RESERVED && resvport_only) {
1068                         syslog(LOG_NOTICE,
1069                             "umount request from %s from unprivileged port",
1070                             numerichost);
1071                         svcerr_weakauth(transp);
1072                         return;
1073                 }
1074                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
1075                         syslog(LOG_NOTICE, "undecodable umount request from %s",
1076                             numerichost);
1077                         svcerr_decode(transp);
1078                         return;
1079                 }
1080                 if (realpath(rpcpath, dirpath) == NULL) {
1081                         syslog(LOG_NOTICE, "umount request from %s "
1082                             "for non existent path %s",
1083                             numerichost, dirpath);
1084                 }
1085                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL))
1086                         syslog(LOG_ERR, "can't send reply");
1087                 if (!lookup_failed)
1088                         del_mlist(host, dirpath);
1089                 del_mlist(numerichost, dirpath);
1090                 if (dolog)
1091                         syslog(LOG_NOTICE,
1092                             "umount request succeeded from %s for %s",
1093                             numerichost, dirpath);
1094                 return;
1095         case MOUNTPROC_UMNTALL:
1096                 if (sport >= IPPORT_RESERVED && resvport_only) {
1097                         syslog(LOG_NOTICE,
1098                             "umountall request from %s from unprivileged port",
1099                             numerichost);
1100                         svcerr_weakauth(transp);
1101                         return;
1102                 }
1103                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL))
1104                         syslog(LOG_ERR, "can't send reply");
1105                 if (!lookup_failed)
1106                         del_mlist(host, NULL);
1107                 del_mlist(numerichost, NULL);
1108                 if (dolog)
1109                         syslog(LOG_NOTICE,
1110                             "umountall request succeeded from %s",
1111                             numerichost);
1112                 return;
1113         case MOUNTPROC_EXPORT:
1114                 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, (caddr_t)NULL))
1115                         if (!svc_sendreply(transp, (xdrproc_t)xdr_explist_brief,
1116                             (caddr_t)NULL))
1117                                 syslog(LOG_ERR, "can't send reply");
1118                 if (dolog)
1119                         syslog(LOG_NOTICE,
1120                             "export request succeeded from %s",
1121                             numerichost);
1122                 return;
1123         default:
1124                 svcerr_noproc(transp);
1125                 return;
1126         }
1127 }
1128
1129 /*
1130  * Xdr conversion for a dirpath string
1131  */
1132 int
1133 xdr_dir(XDR *xdrsp, char *dirp)
1134 {
1135         return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
1136 }
1137
1138 /*
1139  * Xdr routine to generate file handle reply
1140  */
1141 int
1142 xdr_fhs(XDR *xdrsp, caddr_t cp)
1143 {
1144         struct fhreturn *fhrp = (struct fhreturn *)cp;
1145         u_long ok = 0, len, auth;
1146         int i;
1147
1148         if (!xdr_long(xdrsp, &ok))
1149                 return (0);
1150         switch (fhrp->fhr_vers) {
1151         case 1:
1152                 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH));
1153         case 3:
1154                 len = NFSX_V3FH;
1155                 if (!xdr_long(xdrsp, &len))
1156                         return (0);
1157                 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len))
1158                         return (0);
1159                 if (fhrp->fhr_numsecflavors) {
1160                         if (!xdr_int(xdrsp, &fhrp->fhr_numsecflavors))
1161                                 return (0);
1162                         for (i = 0; i < fhrp->fhr_numsecflavors; i++)
1163                                 if (!xdr_int(xdrsp, &fhrp->fhr_secflavors[i]))
1164                                         return (0);
1165                         return (1);
1166                 } else {
1167                         auth = AUTH_SYS;
1168                         len = 1;
1169                         if (!xdr_long(xdrsp, &len))
1170                                 return (0);
1171                         return (xdr_long(xdrsp, &auth));
1172                 }
1173         };
1174         return (0);
1175 }
1176
1177 int
1178 xdr_mlist(XDR *xdrsp, caddr_t cp __unused)
1179 {
1180         struct mountlist *mlp;
1181         int true = 1;
1182         int false = 0;
1183         char *strp;
1184
1185         mlp = mlhead;
1186         while (mlp) {
1187                 if (!xdr_bool(xdrsp, &true))
1188                         return (0);
1189                 strp = &mlp->ml_host[0];
1190                 if (!xdr_string(xdrsp, &strp, MNTNAMLEN))
1191                         return (0);
1192                 strp = &mlp->ml_dirp[0];
1193                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1194                         return (0);
1195                 mlp = mlp->ml_next;
1196         }
1197         if (!xdr_bool(xdrsp, &false))
1198                 return (0);
1199         return (1);
1200 }
1201
1202 /*
1203  * Xdr conversion for export list
1204  */
1205 int
1206 xdr_explist_common(XDR *xdrsp, caddr_t cp __unused, int brief)
1207 {
1208         struct exportlist *ep;
1209         int false = 0;
1210         int putdef;
1211         sigset_t sighup_mask;
1212
1213         sigemptyset(&sighup_mask);
1214         sigaddset(&sighup_mask, SIGHUP);
1215         sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
1216         ep = exphead;
1217         while (ep) {
1218                 putdef = 0;
1219                 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir,
1220                                &putdef, brief))
1221                         goto errout;
1222                 if (ep->ex_defdir && putdef == 0 &&
1223                         put_exlist(ep->ex_defdir, xdrsp, (struct dirlist *)NULL,
1224                         &putdef, brief))
1225                         goto errout;
1226                 ep = ep->ex_next;
1227         }
1228         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1229         if (!xdr_bool(xdrsp, &false))
1230                 return (0);
1231         return (1);
1232 errout:
1233         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1234         return (0);
1235 }
1236
1237 /*
1238  * Called from xdr_explist() to traverse the tree and export the
1239  * directory paths.
1240  */
1241 int
1242 put_exlist(struct dirlist *dp, XDR *xdrsp, struct dirlist *adp, int *putdefp,
1243         int brief)
1244 {
1245         struct grouplist *grp;
1246         struct hostlist *hp;
1247         int true = 1;
1248         int false = 0;
1249         int gotalldir = 0;
1250         char *strp;
1251
1252         if (dp) {
1253                 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp, brief))
1254                         return (1);
1255                 if (!xdr_bool(xdrsp, &true))
1256                         return (1);
1257                 strp = dp->dp_dirp;
1258                 if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1259                         return (1);
1260                 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) {
1261                         gotalldir = 1;
1262                         *putdefp = 1;
1263                 }
1264                 if (brief) {
1265                         if (!xdr_bool(xdrsp, &true))
1266                                 return (1);
1267                         strp = "(...)";
1268                         if (!xdr_string(xdrsp, &strp, MNTPATHLEN))
1269                                 return (1);
1270                 } else if ((dp->dp_flag & DP_DEFSET) == 0 &&
1271                     (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) {
1272                         hp = dp->dp_hosts;
1273                         while (hp) {
1274                                 grp = hp->ht_grp;
1275                                 if (grp->gr_type == GT_HOST) {
1276                                         if (!xdr_bool(xdrsp, &true))
1277                                                 return (1);
1278                                         strp = grp->gr_ptr.gt_addrinfo->ai_canonname;
1279                                         if (!xdr_string(xdrsp, &strp,
1280                                             MNTNAMLEN))
1281                                                 return (1);
1282                                 } else if (grp->gr_type == GT_NET) {
1283                                         if (!xdr_bool(xdrsp, &true))
1284                                                 return (1);
1285                                         strp = grp->gr_ptr.gt_net.nt_name;
1286                                         if (!xdr_string(xdrsp, &strp,
1287                                             MNTNAMLEN))
1288                                                 return (1);
1289                                 }
1290                                 hp = hp->ht_next;
1291                                 if (gotalldir && hp == (struct hostlist *)NULL) {
1292                                         hp = adp->dp_hosts;
1293                                         gotalldir = 0;
1294                                 }
1295                         }
1296                 }
1297                 if (!xdr_bool(xdrsp, &false))
1298                         return (1);
1299                 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp, brief))
1300                         return (1);
1301         }
1302         return (0);
1303 }
1304
1305 int
1306 xdr_explist(XDR *xdrsp, caddr_t cp)
1307 {
1308
1309         return xdr_explist_common(xdrsp, cp, 0);
1310 }
1311
1312 int
1313 xdr_explist_brief(XDR *xdrsp, caddr_t cp)
1314 {
1315
1316         return xdr_explist_common(xdrsp, cp, 1);
1317 }
1318
1319 char *line;
1320 int linesize;
1321 FILE *exp_file;
1322
1323 /*
1324  * Get the export list from one, currently open file
1325  */
1326 static void
1327 get_exportlist_one(void)
1328 {
1329         struct exportlist *ep, *ep2;
1330         struct grouplist *grp, *tgrp;
1331         struct exportlist **epp;
1332         struct dirlist *dirhead;
1333         struct statfs fsb;
1334         struct xucred anon;
1335         char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc;
1336         int len, has_host, exflags, got_nondir, dirplen, netgrp;
1337
1338         v4root_phase = 0;
1339         dirhead = (struct dirlist *)NULL;
1340         while (get_line()) {
1341                 if (debug)
1342                         warnx("got line %s", line);
1343                 cp = line;
1344                 nextfield(&cp, &endcp);
1345                 if (*cp == '#')
1346                         goto nextline;
1347
1348                 /*
1349                  * Set defaults.
1350                  */
1351                 has_host = FALSE;
1352                 anon = def_anon;
1353                 exflags = MNT_EXPORTED;
1354                 got_nondir = 0;
1355                 opt_flags = 0;
1356                 ep = (struct exportlist *)NULL;
1357                 dirp = NULL;
1358
1359                 /*
1360                  * Handle the V4 root dir.
1361                  */
1362                 if (*cp == 'V' && *(cp + 1) == '4' && *(cp + 2) == ':') {
1363                         /*
1364                          * V4: just indicates that it is the v4 root point,
1365                          * so skip over that and set v4root_phase.
1366                          */
1367                         if (v4root_phase > 0) {
1368                                 syslog(LOG_ERR, "V4:duplicate line, ignored");
1369                                 goto nextline;
1370                         }
1371                         v4root_phase = 1;
1372                         cp += 3;
1373                         nextfield(&cp, &endcp);
1374                 }
1375
1376                 /*
1377                  * Create new exports list entry
1378                  */
1379                 len = endcp-cp;
1380                 tgrp = grp = get_grp();
1381                 while (len > 0) {
1382                         if (len > MNTNAMLEN) {
1383                             getexp_err(ep, tgrp);
1384                             goto nextline;
1385                         }
1386                         if (*cp == '-') {
1387                             if (ep == (struct exportlist *)NULL) {
1388                                 getexp_err(ep, tgrp);
1389                                 goto nextline;
1390                             }
1391                             if (debug)
1392                                 warnx("doing opt %s", cp);
1393                             got_nondir = 1;
1394                             if (do_opt(&cp, &endcp, ep, grp, &has_host,
1395                                 &exflags, &anon)) {
1396                                 getexp_err(ep, tgrp);
1397                                 goto nextline;
1398                             }
1399                         } else if (*cp == '/') {
1400                             savedc = *endcp;
1401                             *endcp = '\0';
1402                             if (v4root_phase > 1) {
1403                                     if (dirp != NULL) {
1404                                         syslog(LOG_ERR, "Multiple V4 dirs");
1405                                         getexp_err(ep, tgrp);
1406                                         goto nextline;
1407                                     }
1408                             }
1409                             if (check_dirpath(cp) &&
1410                                 statfs(cp, &fsb) >= 0) {
1411                                 if (got_nondir) {
1412                                     syslog(LOG_ERR, "dirs must be first");
1413                                     getexp_err(ep, tgrp);
1414                                     goto nextline;
1415                                 }
1416                                 if (v4root_phase == 1) {
1417                                     if (dirp != NULL) {
1418                                         syslog(LOG_ERR, "Multiple V4 dirs");
1419                                         getexp_err(ep, tgrp);
1420                                         goto nextline;
1421                                     }
1422                                     if (strlen(v4root_dirpath) == 0) {
1423                                         strlcpy(v4root_dirpath, cp,
1424                                             sizeof (v4root_dirpath));
1425                                     } else if (strcmp(v4root_dirpath, cp)
1426                                         != 0) {
1427                                         syslog(LOG_ERR,
1428                                             "different V4 dirpath %s", cp);
1429                                         getexp_err(ep, tgrp);
1430                                         goto nextline;
1431                                     }
1432                                     dirp = cp;
1433                                     v4root_phase = 2;
1434                                     got_nondir = 1;
1435                                     ep = get_exp();
1436                                 } else {
1437                                     if (ep) {
1438                                         if (ep->ex_fs.val[0] !=
1439                                             fsb.f_fsid.val[0] ||
1440                                             ep->ex_fs.val[1] !=
1441                                             fsb.f_fsid.val[1]) {
1442                                                 getexp_err(ep, tgrp);
1443                                                 goto nextline;
1444                                         }
1445                                     } else {
1446                                         /*
1447                                          * See if this directory is already
1448                                          * in the list.
1449                                          */
1450                                         ep = ex_search(&fsb.f_fsid);
1451                                         if (ep == (struct exportlist *)NULL) {
1452                                             ep = get_exp();
1453                                             ep->ex_fs = fsb.f_fsid;
1454                                             ep->ex_fsdir = (char *)malloc
1455                                                 (strlen(fsb.f_mntonname) + 1);
1456                                             if (ep->ex_fsdir)
1457                                                 strcpy(ep->ex_fsdir,
1458                                                     fsb.f_mntonname);
1459                                             else
1460                                                 out_of_mem();
1461                                             if (debug)
1462                                                 warnx(
1463                                                   "making new ep fs=0x%x,0x%x",
1464                                                   fsb.f_fsid.val[0],
1465                                                   fsb.f_fsid.val[1]);
1466                                         } else if (debug)
1467                                             warnx("found ep fs=0x%x,0x%x",
1468                                                 fsb.f_fsid.val[0],
1469                                                 fsb.f_fsid.val[1]);
1470                                     }
1471
1472                                     /*
1473                                      * Add dirpath to export mount point.
1474                                      */
1475                                     dirp = add_expdir(&dirhead, cp, len);
1476                                     dirplen = len;
1477                                 }
1478                             } else {
1479                                 getexp_err(ep, tgrp);
1480                                 goto nextline;
1481                             }
1482                             *endcp = savedc;
1483                         } else {
1484                             savedc = *endcp;
1485                             *endcp = '\0';
1486                             got_nondir = 1;
1487                             if (ep == (struct exportlist *)NULL) {
1488                                 getexp_err(ep, tgrp);
1489                                 goto nextline;
1490                             }
1491
1492                             /*
1493                              * Get the host or netgroup.
1494                              */
1495                             setnetgrent(cp);
1496                             netgrp = getnetgrent(&hst, &usr, &dom);
1497                             do {
1498                                 if (has_host) {
1499                                     grp->gr_next = get_grp();
1500                                     grp = grp->gr_next;
1501                                 }
1502                                 if (netgrp) {
1503                                     if (hst == 0) {
1504                                         syslog(LOG_ERR,
1505                                 "null hostname in netgroup %s, skipping", cp);
1506                                         grp->gr_type = GT_IGNORE;
1507                                     } else if (get_host(hst, grp, tgrp)) {
1508                                         syslog(LOG_ERR,
1509                         "bad host %s in netgroup %s, skipping", hst, cp);
1510                                         grp->gr_type = GT_IGNORE;
1511                                     }
1512                                 } else if (get_host(cp, grp, tgrp)) {
1513                                     syslog(LOG_ERR, "bad host %s, skipping", cp);
1514                                     grp->gr_type = GT_IGNORE;
1515                                 }
1516                                 has_host = TRUE;
1517                             } while (netgrp && getnetgrent(&hst, &usr, &dom));
1518                             endnetgrent();
1519                             *endcp = savedc;
1520                         }
1521                         cp = endcp;
1522                         nextfield(&cp, &endcp);
1523                         len = endcp - cp;
1524                 }
1525                 if (check_options(dirhead)) {
1526                         getexp_err(ep, tgrp);
1527                         goto nextline;
1528                 }
1529                 if (!has_host) {
1530                         grp->gr_type = GT_DEFAULT;
1531                         if (debug)
1532                                 warnx("adding a default entry");
1533
1534                 /*
1535                  * Don't allow a network export coincide with a list of
1536                  * host(s) on the same line.
1537                  */
1538                 } else if ((opt_flags & OP_NET) && tgrp->gr_next) {
1539                         syslog(LOG_ERR, "network/host conflict");
1540                         getexp_err(ep, tgrp);
1541                         goto nextline;
1542
1543                 /*
1544                  * If an export list was specified on this line, make sure
1545                  * that we have at least one valid entry, otherwise skip it.
1546                  */
1547                 } else {
1548                         grp = tgrp;
1549                         while (grp && grp->gr_type == GT_IGNORE)
1550                                 grp = grp->gr_next;
1551                         if (! grp) {
1552                             getexp_err(ep, tgrp);
1553                             goto nextline;
1554                         }
1555                 }
1556
1557                 if (v4root_phase == 1) {
1558                         syslog(LOG_ERR, "V4:root, no dirp, ignored");
1559                         getexp_err(ep, tgrp);
1560                         goto nextline;
1561                 }
1562
1563                 /*
1564                  * Loop through hosts, pushing the exports into the kernel.
1565                  * After loop, tgrp points to the start of the list and
1566                  * grp points to the last entry in the list.
1567                  */
1568                 grp = tgrp;
1569                 do {
1570                         if (do_mount(ep, grp, exflags, &anon, dirp, dirplen,
1571                             &fsb)) {
1572                                 getexp_err(ep, tgrp);
1573                                 goto nextline;
1574                         }
1575                 } while (grp->gr_next && (grp = grp->gr_next));
1576
1577                 /*
1578                  * For V4: don't enter in mount lists.
1579                  */
1580                 if (v4root_phase > 0 && v4root_phase <= 2) {
1581                         /*
1582                          * Since these structures aren't used by mountd,
1583                          * free them up now.
1584                          */
1585                         if (ep != NULL)
1586                                 free_exp(ep);
1587                         while (tgrp != NULL) {
1588                                 grp = tgrp;
1589                                 tgrp = tgrp->gr_next;
1590                                 free_grp(grp);
1591                         }
1592                         goto nextline;
1593                 }
1594
1595                 /*
1596                  * Success. Update the data structures.
1597                  */
1598                 if (has_host) {
1599                         hang_dirp(dirhead, tgrp, ep, opt_flags);
1600                         grp->gr_next = grphead;
1601                         grphead = tgrp;
1602                 } else {
1603                         hang_dirp(dirhead, (struct grouplist *)NULL, ep,
1604                                 opt_flags);
1605                         free_grp(grp);
1606                 }
1607                 dirhead = (struct dirlist *)NULL;
1608                 if ((ep->ex_flag & EX_LINKED) == 0) {
1609                         ep2 = exphead;
1610                         epp = &exphead;
1611
1612                         /*
1613                          * Insert in the list in alphabetical order.
1614                          */
1615                         while (ep2 && strcmp(ep2->ex_fsdir, ep->ex_fsdir) < 0) {
1616                                 epp = &ep2->ex_next;
1617                                 ep2 = ep2->ex_next;
1618                         }
1619                         if (ep2)
1620                                 ep->ex_next = ep2;
1621                         *epp = ep;
1622                         ep->ex_flag |= EX_LINKED;
1623                 }
1624 nextline:
1625                 v4root_phase = 0;
1626                 if (dirhead) {
1627                         free_dir(dirhead);
1628                         dirhead = (struct dirlist *)NULL;
1629                 }
1630         }
1631 }
1632
1633 /*
1634  * Get the export list from all specified files
1635  */
1636 void
1637 get_exportlist(void)
1638 {
1639         struct exportlist *ep, *ep2;
1640         struct grouplist *grp, *tgrp;
1641         struct export_args export;
1642         struct iovec *iov;
1643         struct statfs *fsp, *mntbufp;
1644         struct xvfsconf vfc;
1645         char *dirp;
1646         char errmsg[255];
1647         int dirplen, num, i;
1648         int iovlen;
1649         int done;
1650         struct nfsex_args eargs;
1651
1652         v4root_dirpath[0] = '\0';
1653         bzero(&export, sizeof(export));
1654         export.ex_flags = MNT_DELEXPORT;
1655         dirp = NULL;
1656         dirplen = 0;
1657         iov = NULL;
1658         iovlen = 0;
1659         bzero(errmsg, sizeof(errmsg));
1660
1661         /*
1662          * First, get rid of the old list
1663          */
1664         ep = exphead;
1665         while (ep) {
1666                 ep2 = ep;
1667                 ep = ep->ex_next;
1668                 free_exp(ep2);
1669         }
1670         exphead = (struct exportlist *)NULL;
1671
1672         grp = grphead;
1673         while (grp) {
1674                 tgrp = grp;
1675                 grp = grp->gr_next;
1676                 free_grp(tgrp);
1677         }
1678         grphead = (struct grouplist *)NULL;
1679
1680         /*
1681          * and the old V4 root dir.
1682          */
1683         bzero(&eargs, sizeof (eargs));
1684         eargs.export.ex_flags = MNT_DELEXPORT;
1685         if (run_v4server > 0 &&
1686             nfssvc(NFSSVC_V4ROOTEXPORT, (caddr_t)&eargs) < 0 &&
1687             errno != ENOENT)
1688                 syslog(LOG_ERR, "Can't delete exports for V4:");
1689
1690         /*
1691          * and clear flag that notes if a public fh has been exported.
1692          */
1693         has_publicfh = 0;
1694
1695         /*
1696          * And delete exports that are in the kernel for all local
1697          * filesystems.
1698          * XXX: Should know how to handle all local exportable filesystems.
1699          */
1700         num = getmntinfo(&mntbufp, MNT_NOWAIT);
1701
1702         if (num > 0) {
1703                 build_iovec(&iov, &iovlen, "fstype", NULL, 0);
1704                 build_iovec(&iov, &iovlen, "fspath", NULL, 0);
1705                 build_iovec(&iov, &iovlen, "from", NULL, 0);
1706                 build_iovec(&iov, &iovlen, "update", NULL, 0);
1707                 build_iovec(&iov, &iovlen, "export", &export, sizeof(export));
1708                 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
1709         }
1710
1711         for (i = 0; i < num; i++) {
1712                 fsp = &mntbufp[i];
1713                 if (getvfsbyname(fsp->f_fstypename, &vfc) != 0) {
1714                         syslog(LOG_ERR, "getvfsbyname() failed for %s",
1715                             fsp->f_fstypename);
1716                         continue;
1717                 }
1718
1719                 /*
1720                  * Do not delete export for network filesystem by
1721                  * passing "export" arg to nmount().
1722                  * It only makes sense to do this for local filesystems.
1723                  */
1724                 if (vfc.vfc_flags & VFCF_NETWORK)
1725                         continue;
1726
1727                 iov[1].iov_base = fsp->f_fstypename;
1728                 iov[1].iov_len = strlen(fsp->f_fstypename) + 1;
1729                 iov[3].iov_base = fsp->f_mntonname;
1730                 iov[3].iov_len = strlen(fsp->f_mntonname) + 1;
1731                 iov[5].iov_base = fsp->f_mntfromname;
1732                 iov[5].iov_len = strlen(fsp->f_mntfromname) + 1;
1733
1734                 if (nmount(iov, iovlen, fsp->f_flags) < 0 &&
1735                     errno != ENOENT && errno != ENOTSUP) {
1736                         syslog(LOG_ERR,
1737                             "can't delete exports for %s: %m %s",
1738                             fsp->f_mntonname, errmsg);
1739                 }
1740         }
1741
1742         if (iov != NULL) {
1743                 /* Free strings allocated by strdup() in getmntopts.c */
1744                 free(iov[0].iov_base); /* fstype */
1745                 free(iov[2].iov_base); /* fspath */
1746                 free(iov[4].iov_base); /* from */
1747                 free(iov[6].iov_base); /* update */
1748                 free(iov[8].iov_base); /* export */
1749                 free(iov[10].iov_base); /* errmsg */
1750
1751                 /* free iov, allocated by realloc() */
1752                 free(iov);
1753                 iovlen = 0;
1754         }
1755
1756         /*
1757          * Read in the exports file and build the list, calling
1758          * nmount() as we go along to push the export rules into the kernel.
1759          */
1760         done = 0;
1761         for (i = 0; exnames[i] != NULL; i++) {
1762                 if (debug)
1763                         warnx("reading exports from %s", exnames[i]);
1764                 if ((exp_file = fopen(exnames[i], "r")) == NULL) {
1765                         syslog(LOG_WARNING, "can't open %s", exnames[i]);
1766                         continue;
1767                 }
1768                 get_exportlist_one();
1769                 fclose(exp_file);
1770                 done++;
1771         }
1772         if (done == 0) {
1773                 syslog(LOG_ERR, "can't open any exports file");
1774                 exit(2);
1775         }
1776
1777         /*
1778          * If there was no public fh, clear any previous one set.
1779          */
1780         if (run_v4server > 0 && has_publicfh == 0)
1781                 (void) nfssvc(NFSSVC_NOPUBLICFH, NULL);
1782 }
1783
1784 /*
1785  * Allocate an export list element
1786  */
1787 struct exportlist *
1788 get_exp(void)
1789 {
1790         struct exportlist *ep;
1791
1792         ep = (struct exportlist *)calloc(1, sizeof (struct exportlist));
1793         if (ep == (struct exportlist *)NULL)
1794                 out_of_mem();
1795         return (ep);
1796 }
1797
1798 /*
1799  * Allocate a group list element
1800  */
1801 struct grouplist *
1802 get_grp(void)
1803 {
1804         struct grouplist *gp;
1805
1806         gp = (struct grouplist *)calloc(1, sizeof (struct grouplist));
1807         if (gp == (struct grouplist *)NULL)
1808                 out_of_mem();
1809         return (gp);
1810 }
1811
1812 /*
1813  * Clean up upon an error in get_exportlist().
1814  */
1815 void
1816 getexp_err(struct exportlist *ep, struct grouplist *grp)
1817 {
1818         struct grouplist *tgrp;
1819
1820         if (!(opt_flags & OP_QUIET))
1821                 syslog(LOG_ERR, "bad exports list line %s", line);
1822         if (ep && (ep->ex_flag & EX_LINKED) == 0)
1823                 free_exp(ep);
1824         while (grp) {
1825                 tgrp = grp;
1826                 grp = grp->gr_next;
1827                 free_grp(tgrp);
1828         }
1829 }
1830
1831 /*
1832  * Search the export list for a matching fs.
1833  */
1834 struct exportlist *
1835 ex_search(fsid_t *fsid)
1836 {
1837         struct exportlist *ep;
1838
1839         ep = exphead;
1840         while (ep) {
1841                 if (ep->ex_fs.val[0] == fsid->val[0] &&
1842                     ep->ex_fs.val[1] == fsid->val[1])
1843                         return (ep);
1844                 ep = ep->ex_next;
1845         }
1846         return (ep);
1847 }
1848
1849 /*
1850  * Add a directory path to the list.
1851  */
1852 char *
1853 add_expdir(struct dirlist **dpp, char *cp, int len)
1854 {
1855         struct dirlist *dp;
1856
1857         dp = (struct dirlist *)malloc(sizeof (struct dirlist) + len);
1858         if (dp == (struct dirlist *)NULL)
1859                 out_of_mem();
1860         dp->dp_left = *dpp;
1861         dp->dp_right = (struct dirlist *)NULL;
1862         dp->dp_flag = 0;
1863         dp->dp_hosts = (struct hostlist *)NULL;
1864         strcpy(dp->dp_dirp, cp);
1865         *dpp = dp;
1866         return (dp->dp_dirp);
1867 }
1868
1869 /*
1870  * Hang the dir list element off the dirpath binary tree as required
1871  * and update the entry for host.
1872  */
1873 void
1874 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep,
1875         int flags)
1876 {
1877         struct hostlist *hp;
1878         struct dirlist *dp2;
1879
1880         if (flags & OP_ALLDIRS) {
1881                 if (ep->ex_defdir)
1882                         free((caddr_t)dp);
1883                 else
1884                         ep->ex_defdir = dp;
1885                 if (grp == (struct grouplist *)NULL) {
1886                         ep->ex_defdir->dp_flag |= DP_DEFSET;
1887                 } else while (grp) {
1888                         hp = get_ht();
1889                         hp->ht_grp = grp;
1890                         hp->ht_next = ep->ex_defdir->dp_hosts;
1891                         ep->ex_defdir->dp_hosts = hp;
1892                         grp = grp->gr_next;
1893                 }
1894         } else {
1895
1896                 /*
1897                  * Loop through the directories adding them to the tree.
1898                  */
1899                 while (dp) {
1900                         dp2 = dp->dp_left;
1901                         add_dlist(&ep->ex_dirl, dp, grp, flags);
1902                         dp = dp2;
1903                 }
1904         }
1905 }
1906
1907 /*
1908  * Traverse the binary tree either updating a node that is already there
1909  * for the new directory or adding the new node.
1910  */
1911 void
1912 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp,
1913         int flags)
1914 {
1915         struct dirlist *dp;
1916         struct hostlist *hp;
1917         int cmp;
1918
1919         dp = *dpp;
1920         if (dp) {
1921                 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp);
1922                 if (cmp > 0) {
1923                         add_dlist(&dp->dp_left, newdp, grp, flags);
1924                         return;
1925                 } else if (cmp < 0) {
1926                         add_dlist(&dp->dp_right, newdp, grp, flags);
1927                         return;
1928                 } else
1929                         free((caddr_t)newdp);
1930         } else {
1931                 dp = newdp;
1932                 dp->dp_left = (struct dirlist *)NULL;
1933                 *dpp = dp;
1934         }
1935         if (grp) {
1936
1937                 /*
1938                  * Hang all of the host(s) off of the directory point.
1939                  */
1940                 do {
1941                         hp = get_ht();
1942                         hp->ht_grp = grp;
1943                         hp->ht_next = dp->dp_hosts;
1944                         dp->dp_hosts = hp;
1945                         grp = grp->gr_next;
1946                 } while (grp);
1947         } else {
1948                 dp->dp_flag |= DP_DEFSET;
1949         }
1950 }
1951
1952 /*
1953  * Search for a dirpath on the export point.
1954  */
1955 struct dirlist *
1956 dirp_search(struct dirlist *dp, char *dirp)
1957 {
1958         int cmp;
1959
1960         if (dp) {
1961                 cmp = strcmp(dp->dp_dirp, dirp);
1962                 if (cmp > 0)
1963                         return (dirp_search(dp->dp_left, dirp));
1964                 else if (cmp < 0)
1965                         return (dirp_search(dp->dp_right, dirp));
1966                 else
1967                         return (dp);
1968         }
1969         return (dp);
1970 }
1971
1972 /*
1973  * Scan for a host match in a directory tree.
1974  */
1975 int
1976 chk_host(struct dirlist *dp, struct sockaddr *saddr, int *defsetp,
1977         int *hostsetp)
1978 {
1979         struct hostlist *hp;
1980         struct grouplist *grp;
1981         struct addrinfo *ai;
1982
1983         if (dp) {
1984                 if (dp->dp_flag & DP_DEFSET)
1985                         *defsetp = dp->dp_flag;
1986                 hp = dp->dp_hosts;
1987                 while (hp) {
1988                         grp = hp->ht_grp;
1989                         switch (grp->gr_type) {
1990                         case GT_HOST:
1991                                 ai = grp->gr_ptr.gt_addrinfo;
1992                                 for (; ai; ai = ai->ai_next) {
1993                                         if (!sacmp(ai->ai_addr, saddr, NULL)) {
1994                                                 *hostsetp =
1995                                                     (hp->ht_flag | DP_HOSTSET);
1996                                                 return (1);
1997                                         }
1998                                 }
1999                                 break;
2000                         case GT_NET:
2001                                 if (!sacmp(saddr, (struct sockaddr *)
2002                                     &grp->gr_ptr.gt_net.nt_net,
2003                                     (struct sockaddr *)
2004                                     &grp->gr_ptr.gt_net.nt_mask)) {
2005                                         *hostsetp = (hp->ht_flag | DP_HOSTSET);
2006                                         return (1);
2007                                 }
2008                                 break;
2009                         }
2010                         hp = hp->ht_next;
2011                 }
2012         }
2013         return (0);
2014 }
2015
2016 /*
2017  * Scan tree for a host that matches the address.
2018  */
2019 int
2020 scan_tree(struct dirlist *dp, struct sockaddr *saddr)
2021 {
2022         int defset, hostset;
2023
2024         if (dp) {
2025                 if (scan_tree(dp->dp_left, saddr))
2026                         return (1);
2027                 if (chk_host(dp, saddr, &defset, &hostset))
2028                         return (1);
2029                 if (scan_tree(dp->dp_right, saddr))
2030                         return (1);
2031         }
2032         return (0);
2033 }
2034
2035 /*
2036  * Traverse the dirlist tree and free it up.
2037  */
2038 void
2039 free_dir(struct dirlist *dp)
2040 {
2041
2042         if (dp) {
2043                 free_dir(dp->dp_left);
2044                 free_dir(dp->dp_right);
2045                 free_host(dp->dp_hosts);
2046                 free((caddr_t)dp);
2047         }
2048 }
2049
2050 /*
2051  * Parse a colon separated list of security flavors
2052  */
2053 int
2054 parsesec(char *seclist, struct exportlist *ep)
2055 {
2056         char *cp, savedc;
2057         int flavor;
2058
2059         ep->ex_numsecflavors = 0;
2060         for (;;) {
2061                 cp = strchr(seclist, ':');
2062                 if (cp) {
2063                         savedc = *cp;
2064                         *cp = '\0';
2065                 }
2066
2067                 if (!strcmp(seclist, "sys"))
2068                         flavor = AUTH_SYS;
2069                 else if (!strcmp(seclist, "krb5"))
2070                         flavor = RPCSEC_GSS_KRB5;
2071                 else if (!strcmp(seclist, "krb5i"))
2072                         flavor = RPCSEC_GSS_KRB5I;
2073                 else if (!strcmp(seclist, "krb5p"))
2074                         flavor = RPCSEC_GSS_KRB5P;
2075                 else {
2076                         if (cp)
2077                                 *cp = savedc;
2078                         syslog(LOG_ERR, "bad sec flavor: %s", seclist);
2079                         return (1);
2080                 }
2081                 if (ep->ex_numsecflavors == MAXSECFLAVORS) {
2082                         if (cp)
2083                                 *cp = savedc;
2084                         syslog(LOG_ERR, "too many sec flavors: %s", seclist);
2085                         return (1);
2086                 }
2087                 ep->ex_secflavors[ep->ex_numsecflavors] = flavor;
2088                 ep->ex_numsecflavors++;
2089                 if (cp) {
2090                         *cp = savedc;
2091                         seclist = cp + 1;
2092                 } else {
2093                         break;
2094                 }
2095         }
2096         return (0);
2097 }
2098
2099 /*
2100  * Parse the option string and update fields.
2101  * Option arguments may either be -<option>=<value> or
2102  * -<option> <value>
2103  */
2104 int
2105 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp,
2106         int *has_hostp, int *exflagsp, struct xucred *cr)
2107 {
2108         char *cpoptarg, *cpoptend;
2109         char *cp, *endcp, *cpopt, savedc, savedc2;
2110         int allflag, usedarg;
2111
2112         savedc2 = '\0';
2113         cpopt = *cpp;
2114         cpopt++;
2115         cp = *endcpp;
2116         savedc = *cp;
2117         *cp = '\0';
2118         while (cpopt && *cpopt) {
2119                 allflag = 1;
2120                 usedarg = -2;
2121                 if ((cpoptend = strchr(cpopt, ','))) {
2122                         *cpoptend++ = '\0';
2123                         if ((cpoptarg = strchr(cpopt, '=')))
2124                                 *cpoptarg++ = '\0';
2125                 } else {
2126                         if ((cpoptarg = strchr(cpopt, '=')))
2127                                 *cpoptarg++ = '\0';
2128                         else {
2129                                 *cp = savedc;
2130                                 nextfield(&cp, &endcp);
2131                                 **endcpp = '\0';
2132                                 if (endcp > cp && *cp != '-') {
2133                                         cpoptarg = cp;
2134                                         savedc2 = *endcp;
2135                                         *endcp = '\0';
2136                                         usedarg = 0;
2137                                 }
2138                         }
2139                 }
2140                 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) {
2141                         *exflagsp |= MNT_EXRDONLY;
2142                 } else if (cpoptarg && (!strcmp(cpopt, "maproot") ||
2143                     !(allflag = strcmp(cpopt, "mapall")) ||
2144                     !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) {
2145                         usedarg++;
2146                         parsecred(cpoptarg, cr);
2147                         if (allflag == 0) {
2148                                 *exflagsp |= MNT_EXPORTANON;
2149                                 opt_flags |= OP_MAPALL;
2150                         } else
2151                                 opt_flags |= OP_MAPROOT;
2152                 } else if (cpoptarg && (!strcmp(cpopt, "mask") ||
2153                     !strcmp(cpopt, "m"))) {
2154                         if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) {
2155                                 syslog(LOG_ERR, "bad mask: %s", cpoptarg);
2156                                 return (1);
2157                         }
2158                         usedarg++;
2159                         opt_flags |= OP_MASK;
2160                 } else if (cpoptarg && (!strcmp(cpopt, "network") ||
2161                         !strcmp(cpopt, "n"))) {
2162                         if (strchr(cpoptarg, '/') != NULL) {
2163                                 if (debug)
2164                                         fprintf(stderr, "setting OP_MASKLEN\n");
2165                                 opt_flags |= OP_MASKLEN;
2166                         }
2167                         if (grp->gr_type != GT_NULL) {
2168                                 syslog(LOG_ERR, "network/host conflict");
2169                                 return (1);
2170                         } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) {
2171                                 syslog(LOG_ERR, "bad net: %s", cpoptarg);
2172                                 return (1);
2173                         }
2174                         grp->gr_type = GT_NET;
2175                         *has_hostp = 1;
2176                         usedarg++;
2177                         opt_flags |= OP_NET;
2178                 } else if (!strcmp(cpopt, "alldirs")) {
2179                         opt_flags |= OP_ALLDIRS;
2180                 } else if (!strcmp(cpopt, "public")) {
2181                         *exflagsp |= MNT_EXPUBLIC;
2182                 } else if (!strcmp(cpopt, "webnfs")) {
2183                         *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON);
2184                         opt_flags |= OP_MAPALL;
2185                 } else if (cpoptarg && !strcmp(cpopt, "index")) {
2186                         ep->ex_indexfile = strdup(cpoptarg);
2187                 } else if (!strcmp(cpopt, "quiet")) {
2188                         opt_flags |= OP_QUIET;
2189                 } else if (!strcmp(cpopt, "sec")) {
2190                         if (parsesec(cpoptarg, ep))
2191                                 return (1);
2192                         opt_flags |= OP_SEC;
2193                         usedarg++;
2194                 } else {
2195                         syslog(LOG_ERR, "bad opt %s", cpopt);
2196                         return (1);
2197                 }
2198                 if (usedarg >= 0) {
2199                         *endcp = savedc2;
2200                         **endcpp = savedc;
2201                         if (usedarg > 0) {
2202                                 *cpp = cp;
2203                                 *endcpp = endcp;
2204                         }
2205                         return (0);
2206                 }
2207                 cpopt = cpoptend;
2208         }
2209         **endcpp = savedc;
2210         return (0);
2211 }
2212
2213 /*
2214  * Translate a character string to the corresponding list of network
2215  * addresses for a hostname.
2216  */
2217 int
2218 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp)
2219 {
2220         struct grouplist *checkgrp;
2221         struct addrinfo *ai, *tai, hints;
2222         int ecode;
2223         char host[NI_MAXHOST];
2224
2225         if (grp->gr_type != GT_NULL) {
2226                 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp);
2227                 return (1);
2228         }
2229         memset(&hints, 0, sizeof hints);
2230         hints.ai_flags = AI_CANONNAME;
2231         hints.ai_protocol = IPPROTO_UDP;
2232         ecode = getaddrinfo(cp, NULL, &hints, &ai);
2233         if (ecode != 0) {
2234                 syslog(LOG_ERR,"can't get address info for host %s", cp);
2235                 return 1;
2236         }
2237         grp->gr_ptr.gt_addrinfo = ai;
2238         while (ai != NULL) {
2239                 if (ai->ai_canonname == NULL) {
2240                         if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host,
2241                             sizeof host, NULL, 0, NI_NUMERICHOST) != 0)
2242                                 strlcpy(host, "?", sizeof(host));
2243                         ai->ai_canonname = strdup(host);
2244                         ai->ai_flags |= AI_CANONNAME;
2245                 }
2246                 if (debug)
2247                         fprintf(stderr, "got host %s\n", ai->ai_canonname);
2248                 /*
2249                  * Sanity check: make sure we don't already have an entry
2250                  * for this host in the grouplist.
2251                  */
2252                 for (checkgrp = tgrp; checkgrp != NULL;
2253                     checkgrp = checkgrp->gr_next) {
2254                         if (checkgrp->gr_type != GT_HOST)
2255                                 continue;
2256                         for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL;
2257                             tai = tai->ai_next) {
2258                                 if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0)
2259                                         continue;
2260                                 if (debug)
2261                                         fprintf(stderr,
2262                                             "ignoring duplicate host %s\n",
2263                                             ai->ai_canonname);
2264                                 grp->gr_type = GT_IGNORE;
2265                                 return (0);
2266                         }
2267                 }
2268                 ai = ai->ai_next;
2269         }
2270         grp->gr_type = GT_HOST;
2271         return (0);
2272 }
2273
2274 /*
2275  * Free up an exports list component
2276  */
2277 void
2278 free_exp(struct exportlist *ep)
2279 {
2280
2281         if (ep->ex_defdir) {
2282                 free_host(ep->ex_defdir->dp_hosts);
2283                 free((caddr_t)ep->ex_defdir);
2284         }
2285         if (ep->ex_fsdir)
2286                 free(ep->ex_fsdir);
2287         if (ep->ex_indexfile)
2288                 free(ep->ex_indexfile);
2289         free_dir(ep->ex_dirl);
2290         free((caddr_t)ep);
2291 }
2292
2293 /*
2294  * Free hosts.
2295  */
2296 void
2297 free_host(struct hostlist *hp)
2298 {
2299         struct hostlist *hp2;
2300
2301         while (hp) {
2302                 hp2 = hp;
2303                 hp = hp->ht_next;
2304                 free((caddr_t)hp2);
2305         }
2306 }
2307
2308 struct hostlist *
2309 get_ht(void)
2310 {
2311         struct hostlist *hp;
2312
2313         hp = (struct hostlist *)malloc(sizeof (struct hostlist));
2314         if (hp == (struct hostlist *)NULL)
2315                 out_of_mem();
2316         hp->ht_next = (struct hostlist *)NULL;
2317         hp->ht_flag = 0;
2318         return (hp);
2319 }
2320
2321 /*
2322  * Out of memory, fatal
2323  */
2324 void
2325 out_of_mem(void)
2326 {
2327
2328         syslog(LOG_ERR, "out of memory");
2329         exit(2);
2330 }
2331
2332 /*
2333  * Do the nmount() syscall with the update flag to push the export info into
2334  * the kernel.
2335  */
2336 int
2337 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags,
2338     struct xucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb)
2339 {
2340         struct statfs fsb1;
2341         struct addrinfo *ai;
2342         struct export_args ea, *eap;
2343         char errmsg[255];
2344         char *cp;
2345         int done;
2346         char savedc;
2347         struct iovec *iov;
2348         int i, iovlen;
2349         int ret;
2350         struct nfsex_args nfsea;
2351
2352         if (run_v4server > 0)
2353                 eap = &nfsea.export;
2354         else
2355                 eap = &ea;
2356
2357         cp = NULL;
2358         savedc = '\0';
2359         iov = NULL;
2360         iovlen = 0;
2361         ret = 0;
2362
2363         bzero(eap, sizeof (struct export_args));
2364         bzero(errmsg, sizeof(errmsg));
2365         eap->ex_flags = exflags;
2366         eap->ex_anon = *anoncrp;
2367         eap->ex_indexfile = ep->ex_indexfile;
2368         if (grp->gr_type == GT_HOST)
2369                 ai = grp->gr_ptr.gt_addrinfo;
2370         else
2371                 ai = NULL;
2372         eap->ex_numsecflavors = ep->ex_numsecflavors;
2373         for (i = 0; i < eap->ex_numsecflavors; i++)
2374                 eap->ex_secflavors[i] = ep->ex_secflavors[i];
2375         if (eap->ex_numsecflavors == 0) {
2376                 eap->ex_numsecflavors = 1;
2377                 eap->ex_secflavors[0] = AUTH_SYS;
2378         }
2379         done = FALSE;
2380
2381         if (v4root_phase == 0) {
2382                 build_iovec(&iov, &iovlen, "fstype", NULL, 0);
2383                 build_iovec(&iov, &iovlen, "fspath", NULL, 0);
2384                 build_iovec(&iov, &iovlen, "from", NULL, 0);
2385                 build_iovec(&iov, &iovlen, "update", NULL, 0);
2386                 build_iovec(&iov, &iovlen, "export", eap,
2387                     sizeof (struct export_args));
2388                 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
2389         }
2390
2391         while (!done) {
2392                 switch (grp->gr_type) {
2393                 case GT_HOST:
2394                         if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0)
2395                                 goto skip;
2396                         eap->ex_addr = ai->ai_addr;
2397                         eap->ex_addrlen = ai->ai_addrlen;
2398                         eap->ex_masklen = 0;
2399                         break;
2400                 case GT_NET:
2401                         if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 &&
2402                             have_v6 == 0)
2403                                 goto skip;
2404                         eap->ex_addr =
2405                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net;
2406                         eap->ex_addrlen =
2407                             ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_net)->sa_len;
2408                         eap->ex_mask =
2409                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask;
2410                         eap->ex_masklen = ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask)->sa_len;
2411                         break;
2412                 case GT_DEFAULT:
2413                         eap->ex_addr = NULL;
2414                         eap->ex_addrlen = 0;
2415                         eap->ex_mask = NULL;
2416                         eap->ex_masklen = 0;
2417                         break;
2418                 case GT_IGNORE:
2419                         ret = 0;
2420                         goto error_exit;
2421                         break;
2422                 default:
2423                         syslog(LOG_ERR, "bad grouptype");
2424                         if (cp)
2425                                 *cp = savedc;
2426                         ret = 1;
2427                         goto error_exit;
2428                 };
2429
2430                 /*
2431                  * For V4:, use the nfssvc() syscall, instead of mount().
2432                  */
2433                 if (v4root_phase == 2) {
2434                         nfsea.fspec = v4root_dirpath;
2435                         if (run_v4server > 0 &&
2436                             nfssvc(NFSSVC_V4ROOTEXPORT, (caddr_t)&nfsea) < 0) {
2437                                 syslog(LOG_ERR, "Exporting V4: failed");
2438                                 return (2);
2439                         }
2440                 } else {
2441                         /*
2442                          * XXX:
2443                          * Maybe I should just use the fsb->f_mntonname path
2444                          * instead of looping back up the dirp to the mount
2445                          * point??
2446                          * Also, needs to know how to export all types of local
2447                          * exportable filesystems and not just "ufs".
2448                          */
2449                         iov[1].iov_base = fsb->f_fstypename; /* "fstype" */
2450                         iov[1].iov_len = strlen(fsb->f_fstypename) + 1;
2451                         iov[3].iov_base = fsb->f_mntonname; /* "fspath" */
2452                         iov[3].iov_len = strlen(fsb->f_mntonname) + 1;
2453                         iov[5].iov_base = fsb->f_mntfromname; /* "from" */
2454                         iov[5].iov_len = strlen(fsb->f_mntfromname) + 1;
2455
2456                         while (nmount(iov, iovlen, fsb->f_flags) < 0) {
2457                                 if (cp)
2458                                         *cp-- = savedc;
2459                                 else
2460                                         cp = dirp + dirplen - 1;
2461                                 if (opt_flags & OP_QUIET) {
2462                                         ret = 1;
2463                                         goto error_exit;
2464                                 }
2465                                 if (errno == EPERM) {
2466                                         if (debug)
2467                                                 warnx("can't change attributes for %s",
2468                                                     dirp);
2469                                         syslog(LOG_ERR,
2470                                            "can't change attributes for %s",
2471                                             dirp);
2472                                         ret = 1;
2473                                         goto error_exit;
2474                                 }
2475                                 if (opt_flags & OP_ALLDIRS) {
2476                                         if (errno == EINVAL)
2477                                                 syslog(LOG_ERR,
2478                 "-alldirs requested but %s is not a filesystem mountpoint",
2479                                                     dirp);
2480                                         else
2481                                                 syslog(LOG_ERR,
2482                                                     "could not remount %s: %m",
2483                                                     dirp);
2484                                         ret = 1;
2485                                         goto error_exit;
2486                                 }
2487                                 /* back up over the last component */
2488                                 while (*cp == '/' && cp > dirp)
2489                                         cp--;
2490                                 while (*(cp - 1) != '/' && cp > dirp)
2491                                         cp--;
2492                                 if (cp == dirp) {
2493                                         if (debug)
2494                                                 warnx("mnt unsucc");
2495                                         syslog(LOG_ERR, "can't export %s %s",
2496                                             dirp, errmsg);
2497                                         ret = 1;
2498                                         goto error_exit;
2499                                 }
2500                                 savedc = *cp;
2501                                 *cp = '\0';
2502                                 /*
2503                                  * Check that we're still on the same
2504                                  * filesystem.
2505                                  */
2506                                 if (statfs(dirp, &fsb1) != 0 ||
2507                                     bcmp(&fsb1.f_fsid, &fsb->f_fsid,
2508                                     sizeof (fsb1.f_fsid)) != 0) {
2509                                         *cp = savedc;
2510                                         syslog(LOG_ERR,
2511                                             "can't export %s %s", dirp,
2512                                             errmsg);
2513                                         ret = 1;
2514                                         goto error_exit;
2515                                 }
2516                         }
2517                 }
2518
2519                 /*
2520                  * For the experimental server:
2521                  * If this is the public directory, get the file handle
2522                  * and load it into the kernel via the nfssvc() syscall.
2523                  */
2524                 if (run_v4server > 0 && (exflags & MNT_EXPUBLIC) != 0) {
2525                         fhandle_t fh;
2526                         char *public_name;
2527
2528                         if (eap->ex_indexfile != NULL)
2529                                 public_name = eap->ex_indexfile;
2530                         else
2531                                 public_name = dirp;
2532                         if (getfh(public_name, &fh) < 0)
2533                                 syslog(LOG_ERR,
2534                                     "Can't get public fh for %s", public_name);
2535                         else if (nfssvc(NFSSVC_PUBLICFH, (caddr_t)&fh) < 0)
2536                                 syslog(LOG_ERR,
2537                                     "Can't set public fh for %s", public_name);
2538                         else
2539                                 has_publicfh = 1;
2540                 }
2541 skip:
2542                 if (ai != NULL)
2543                         ai = ai->ai_next;
2544                 if (ai == NULL)
2545                         done = TRUE;
2546         }
2547         if (cp)
2548                 *cp = savedc;
2549 error_exit:
2550         /* free strings allocated by strdup() in getmntopts.c */
2551         if (iov != NULL) {
2552                 free(iov[0].iov_base); /* fstype */
2553                 free(iov[2].iov_base); /* fspath */
2554                 free(iov[4].iov_base); /* from */
2555                 free(iov[6].iov_base); /* update */
2556                 free(iov[8].iov_base); /* export */
2557                 free(iov[10].iov_base); /* errmsg */
2558
2559                 /* free iov, allocated by realloc() */
2560                 free(iov);
2561         }
2562         return (ret);
2563 }
2564
2565 /*
2566  * Translate a net address.
2567  *
2568  * If `maskflg' is nonzero, then `cp' is a netmask, not a network address.
2569  */
2570 int
2571 get_net(char *cp, struct netmsk *net, int maskflg)
2572 {
2573         struct netent *np = NULL;
2574         char *name, *p, *prefp;
2575         struct sockaddr_in sin;
2576         struct sockaddr *sa = NULL;
2577         struct addrinfo hints, *ai = NULL;
2578         char netname[NI_MAXHOST];
2579         long preflen;
2580
2581         p = prefp = NULL;
2582         if ((opt_flags & OP_MASKLEN) && !maskflg) {
2583                 p = strchr(cp, '/');
2584                 *p = '\0';
2585                 prefp = p + 1;
2586         }
2587
2588         /*
2589          * Check for a numeric address first. We wish to avoid
2590          * possible DNS lookups in getnetbyname().
2591          */
2592         if (isxdigit(*cp) || *cp == ':') {
2593                 memset(&hints, 0, sizeof hints);
2594                 /* Ensure the mask and the network have the same family. */
2595                 if (maskflg && (opt_flags & OP_NET))
2596                         hints.ai_family = net->nt_net.ss_family;
2597                 else if (!maskflg && (opt_flags & OP_HAVEMASK))
2598                         hints.ai_family = net->nt_mask.ss_family;
2599                 else
2600                         hints.ai_family = AF_UNSPEC;
2601                 hints.ai_flags = AI_NUMERICHOST;
2602                 if (getaddrinfo(cp, NULL, &hints, &ai) == 0)
2603                         sa = ai->ai_addr;
2604                 if (sa != NULL && ai->ai_family == AF_INET) {
2605                         /*
2606                          * The address in `cp' is really a network address, so
2607                          * use inet_network() to re-interpret this correctly.
2608                          * e.g. "127.1" means 127.1.0.0, not 127.0.0.1.
2609                          */
2610                         bzero(&sin, sizeof sin);
2611                         sin.sin_family = AF_INET;
2612                         sin.sin_len = sizeof sin;
2613                         sin.sin_addr = inet_makeaddr(inet_network(cp), 0);
2614                         if (debug)
2615                                 fprintf(stderr, "get_net: v4 addr %s\n",
2616                                     inet_ntoa(sin.sin_addr));
2617                         sa = (struct sockaddr *)&sin;
2618                 }
2619         }
2620         if (sa == NULL && (np = getnetbyname(cp)) != NULL) {
2621                 bzero(&sin, sizeof sin);
2622                 sin.sin_family = AF_INET;
2623                 sin.sin_len = sizeof sin;
2624                 sin.sin_addr = inet_makeaddr(np->n_net, 0);
2625                 sa = (struct sockaddr *)&sin;
2626         }
2627         if (sa == NULL)
2628                 goto fail;
2629
2630         if (maskflg) {
2631                 /* The specified sockaddr is a mask. */
2632                 if (checkmask(sa) != 0)
2633                         goto fail;
2634                 bcopy(sa, &net->nt_mask, sa->sa_len);
2635                 opt_flags |= OP_HAVEMASK;
2636         } else {
2637                 /* The specified sockaddr is a network address. */
2638                 bcopy(sa, &net->nt_net, sa->sa_len);
2639
2640                 /* Get a network name for the export list. */
2641                 if (np) {
2642                         name = np->n_name;
2643                 } else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname,
2644                    NULL, 0, NI_NUMERICHOST) == 0) {
2645                         name = netname;
2646                 } else {
2647                         goto fail;
2648                 }
2649                 if ((net->nt_name = strdup(name)) == NULL)
2650                         out_of_mem();
2651
2652                 /*
2653                  * Extract a mask from either a "/<masklen>" suffix, or
2654                  * from the class of an IPv4 address.
2655                  */
2656                 if (opt_flags & OP_MASKLEN) {
2657                         preflen = strtol(prefp, NULL, 10);
2658                         if (preflen < 0L || preflen == LONG_MAX)
2659                                 goto fail;
2660                         bcopy(sa, &net->nt_mask, sa->sa_len);
2661                         if (makemask(&net->nt_mask, (int)preflen) != 0)
2662                                 goto fail;
2663                         opt_flags |= OP_HAVEMASK;
2664                         *p = '/';
2665                 } else if (sa->sa_family == AF_INET &&
2666                     (opt_flags & OP_MASK) == 0) {
2667                         in_addr_t addr;
2668
2669                         addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
2670                         if (IN_CLASSA(addr))
2671                                 preflen = 8;
2672                         else if (IN_CLASSB(addr))
2673                                 preflen = 16;
2674                         else if (IN_CLASSC(addr))
2675                                 preflen = 24;
2676                         else if (IN_CLASSD(addr))
2677                                 preflen = 28;
2678                         else
2679                                 preflen = 32;   /* XXX */
2680
2681                         bcopy(sa, &net->nt_mask, sa->sa_len);
2682                         makemask(&net->nt_mask, (int)preflen);
2683                         opt_flags |= OP_HAVEMASK;
2684                 }
2685         }
2686
2687         if (ai)
2688                 freeaddrinfo(ai);
2689         return 0;
2690
2691 fail:
2692         if (ai)
2693                 freeaddrinfo(ai);
2694         return 1;
2695 }
2696
2697 /*
2698  * Parse out the next white space separated field
2699  */
2700 void
2701 nextfield(char **cp, char **endcp)
2702 {
2703         char *p;
2704
2705         p = *cp;
2706         while (*p == ' ' || *p == '\t')
2707                 p++;
2708         if (*p == '\n' || *p == '\0')
2709                 *cp = *endcp = p;
2710         else {
2711                 *cp = p++;
2712                 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
2713                         p++;
2714                 *endcp = p;
2715         }
2716 }
2717
2718 /*
2719  * Get an exports file line. Skip over blank lines and handle line
2720  * continuations.
2721  */
2722 int
2723 get_line(void)
2724 {
2725         char *p, *cp;
2726         size_t len;
2727         int totlen, cont_line;
2728
2729         /*
2730          * Loop around ignoring blank lines and getting all continuation lines.
2731          */
2732         p = line;
2733         totlen = 0;
2734         do {
2735                 if ((p = fgetln(exp_file, &len)) == NULL)
2736                         return (0);
2737                 cp = p + len - 1;
2738                 cont_line = 0;
2739                 while (cp >= p &&
2740                     (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) {
2741                         if (*cp == '\\')
2742                                 cont_line = 1;
2743                         cp--;
2744                         len--;
2745                 }
2746                 if (cont_line) {
2747                         *++cp = ' ';
2748                         len++;
2749                 }
2750                 if (linesize < len + totlen + 1) {
2751                         linesize = len + totlen + 1;
2752                         line = realloc(line, linesize);
2753                         if (line == NULL)
2754                                 out_of_mem();
2755                 }
2756                 memcpy(line + totlen, p, len);
2757                 totlen += len;
2758                 line[totlen] = '\0';
2759         } while (totlen == 0 || cont_line);
2760         return (1);
2761 }
2762
2763 /*
2764  * Parse a description of a credential.
2765  */
2766 void
2767 parsecred(char *namelist, struct xucred *cr)
2768 {
2769         char *name;
2770         int cnt;
2771         char *names;
2772         struct passwd *pw;
2773         struct group *gr;
2774         gid_t groups[XU_NGROUPS + 1];
2775         int ngroups;
2776
2777         cr->cr_version = XUCRED_VERSION;
2778         /*
2779          * Set up the unprivileged user.
2780          */
2781         cr->cr_uid = -2;
2782         cr->cr_groups[0] = -2;
2783         cr->cr_ngroups = 1;
2784         /*
2785          * Get the user's password table entry.
2786          */
2787         names = strsep(&namelist, " \t\n");
2788         name = strsep(&names, ":");
2789         if (isdigit(*name) || *name == '-')
2790                 pw = getpwuid(atoi(name));
2791         else
2792                 pw = getpwnam(name);
2793         /*
2794          * Credentials specified as those of a user.
2795          */
2796         if (names == NULL) {
2797                 if (pw == NULL) {
2798                         syslog(LOG_ERR, "unknown user: %s", name);
2799                         return;
2800                 }
2801                 cr->cr_uid = pw->pw_uid;
2802                 ngroups = XU_NGROUPS + 1;
2803                 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups))
2804                         syslog(LOG_ERR, "too many groups");
2805                 /*
2806                  * Compress out duplicate.
2807                  */
2808                 cr->cr_ngroups = ngroups - 1;
2809                 cr->cr_groups[0] = groups[0];
2810                 for (cnt = 2; cnt < ngroups; cnt++)
2811                         cr->cr_groups[cnt - 1] = groups[cnt];
2812                 return;
2813         }
2814         /*
2815          * Explicit credential specified as a colon separated list:
2816          *      uid:gid:gid:...
2817          */
2818         if (pw != NULL)
2819                 cr->cr_uid = pw->pw_uid;
2820         else if (isdigit(*name) || *name == '-')
2821                 cr->cr_uid = atoi(name);
2822         else {
2823                 syslog(LOG_ERR, "unknown user: %s", name);
2824                 return;
2825         }
2826         cr->cr_ngroups = 0;
2827         while (names != NULL && *names != '\0' && cr->cr_ngroups < XU_NGROUPS) {
2828                 name = strsep(&names, ":");
2829                 if (isdigit(*name) || *name == '-') {
2830                         cr->cr_groups[cr->cr_ngroups++] = atoi(name);
2831                 } else {
2832                         if ((gr = getgrnam(name)) == NULL) {
2833                                 syslog(LOG_ERR, "unknown group: %s", name);
2834                                 continue;
2835                         }
2836                         cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid;
2837                 }
2838         }
2839         if (names != NULL && *names != '\0' && cr->cr_ngroups == XU_NGROUPS)
2840                 syslog(LOG_ERR, "too many groups");
2841 }
2842
2843 #define STRSIZ  (MNTNAMLEN+MNTPATHLEN+50)
2844 /*
2845  * Routines that maintain the remote mounttab
2846  */
2847 void
2848 get_mountlist(void)
2849 {
2850         struct mountlist *mlp, **mlpp;
2851         char *host, *dirp, *cp;
2852         char str[STRSIZ];
2853         FILE *mlfile;
2854
2855         if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) {
2856                 if (errno == ENOENT)
2857                         return;
2858                 else {
2859                         syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST);
2860                         return;
2861                 }
2862         }
2863         mlpp = &mlhead;
2864         while (fgets(str, STRSIZ, mlfile) != NULL) {
2865                 cp = str;
2866                 host = strsep(&cp, " \t\n");
2867                 dirp = strsep(&cp, " \t\n");
2868                 if (host == NULL || dirp == NULL)
2869                         continue;
2870                 mlp = (struct mountlist *)malloc(sizeof (*mlp));
2871                 if (mlp == (struct mountlist *)NULL)
2872                         out_of_mem();
2873                 strncpy(mlp->ml_host, host, MNTNAMLEN);
2874                 mlp->ml_host[MNTNAMLEN] = '\0';
2875                 strncpy(mlp->ml_dirp, dirp, MNTPATHLEN);
2876                 mlp->ml_dirp[MNTPATHLEN] = '\0';
2877                 mlp->ml_next = (struct mountlist *)NULL;
2878                 *mlpp = mlp;
2879                 mlpp = &mlp->ml_next;
2880         }
2881         fclose(mlfile);
2882 }
2883
2884 void
2885 del_mlist(char *hostp, char *dirp)
2886 {
2887         struct mountlist *mlp, **mlpp;
2888         struct mountlist *mlp2;
2889         FILE *mlfile;
2890         int fnd = 0;
2891
2892         mlpp = &mlhead;
2893         mlp = mlhead;
2894         while (mlp) {
2895                 if (!strcmp(mlp->ml_host, hostp) &&
2896                     (!dirp || !strcmp(mlp->ml_dirp, dirp))) {
2897                         fnd = 1;
2898                         mlp2 = mlp;
2899                         *mlpp = mlp = mlp->ml_next;
2900                         free((caddr_t)mlp2);
2901                 } else {
2902                         mlpp = &mlp->ml_next;
2903                         mlp = mlp->ml_next;
2904                 }
2905         }
2906         if (fnd) {
2907                 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) {
2908                         syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST);
2909                         return;
2910                 }
2911                 mlp = mlhead;
2912                 while (mlp) {
2913                         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
2914                         mlp = mlp->ml_next;
2915                 }
2916                 fclose(mlfile);
2917         }
2918 }
2919
2920 void
2921 add_mlist(char *hostp, char *dirp)
2922 {
2923         struct mountlist *mlp, **mlpp;
2924         FILE *mlfile;
2925
2926         mlpp = &mlhead;
2927         mlp = mlhead;
2928         while (mlp) {
2929                 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp))
2930                         return;
2931                 mlpp = &mlp->ml_next;
2932                 mlp = mlp->ml_next;
2933         }
2934         mlp = (struct mountlist *)malloc(sizeof (*mlp));
2935         if (mlp == (struct mountlist *)NULL)
2936                 out_of_mem();
2937         strncpy(mlp->ml_host, hostp, MNTNAMLEN);
2938         mlp->ml_host[MNTNAMLEN] = '\0';
2939         strncpy(mlp->ml_dirp, dirp, MNTPATHLEN);
2940         mlp->ml_dirp[MNTPATHLEN] = '\0';
2941         mlp->ml_next = (struct mountlist *)NULL;
2942         *mlpp = mlp;
2943         if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
2944                 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST);
2945                 return;
2946         }
2947         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
2948         fclose(mlfile);
2949 }
2950
2951 /*
2952  * Free up a group list.
2953  */
2954 void
2955 free_grp(struct grouplist *grp)
2956 {
2957         if (grp->gr_type == GT_HOST) {
2958                 if (grp->gr_ptr.gt_addrinfo != NULL)
2959                         freeaddrinfo(grp->gr_ptr.gt_addrinfo);
2960         } else if (grp->gr_type == GT_NET) {
2961                 if (grp->gr_ptr.gt_net.nt_name)
2962                         free(grp->gr_ptr.gt_net.nt_name);
2963         }
2964         free((caddr_t)grp);
2965 }
2966
2967 #ifdef DEBUG
2968 void
2969 SYSLOG(int pri, const char *fmt, ...)
2970 {
2971         va_list ap;
2972
2973         va_start(ap, fmt);
2974         vfprintf(stderr, fmt, ap);
2975         va_end(ap);
2976 }
2977 #endif /* DEBUG */
2978
2979 /*
2980  * Check options for consistency.
2981  */
2982 int
2983 check_options(struct dirlist *dp)
2984 {
2985
2986         if (v4root_phase == 0 && dp == NULL)
2987             return (1);
2988         if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL)) {
2989             syslog(LOG_ERR, "-mapall and -maproot mutually exclusive");
2990             return (1);
2991         }
2992         if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) {
2993                 syslog(LOG_ERR, "-mask requires -network");
2994                 return (1);
2995         }
2996         if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) {
2997                 syslog(LOG_ERR, "-network requires mask specification");
2998                 return (1);
2999         }
3000         if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) {
3001                 syslog(LOG_ERR, "-mask and /masklen are mutually exclusive");
3002                 return (1);
3003         }
3004         if (v4root_phase > 0 &&
3005             (opt_flags &
3006              ~(OP_SEC | OP_MASK | OP_NET | OP_HAVEMASK | OP_MASKLEN)) != 0) {
3007             syslog(LOG_ERR,"only -sec,-net,-mask options allowed on V4:");
3008             return (1);
3009         }
3010         if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
3011             syslog(LOG_ERR, "-alldirs has multiple directories");
3012             return (1);
3013         }
3014         return (0);
3015 }
3016
3017 /*
3018  * Check an absolute directory path for any symbolic links. Return true
3019  */
3020 int
3021 check_dirpath(char *dirp)
3022 {
3023         char *cp;
3024         int ret = 1;
3025         struct stat sb;
3026
3027         cp = dirp + 1;
3028         while (*cp && ret) {
3029                 if (*cp == '/') {
3030                         *cp = '\0';
3031                         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
3032                                 ret = 0;
3033                         *cp = '/';
3034                 }
3035                 cp++;
3036         }
3037         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
3038                 ret = 0;
3039         return (ret);
3040 }
3041
3042 /*
3043  * Make a netmask according to the specified prefix length. The ss_family
3044  * and other non-address fields must be initialised before calling this.
3045  */
3046 int
3047 makemask(struct sockaddr_storage *ssp, int bitlen)
3048 {
3049         u_char *p;
3050         int bits, i, len;
3051
3052         if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL)
3053                 return (-1);
3054         if (bitlen > len * CHAR_BIT)
3055                 return (-1);
3056
3057         for (i = 0; i < len; i++) {
3058                 bits = (bitlen > CHAR_BIT) ? CHAR_BIT : bitlen;
3059                 *p++ = (u_char)~0 << (CHAR_BIT - bits);
3060                 bitlen -= bits;
3061         }
3062         return 0;
3063 }
3064
3065 /*
3066  * Check that the sockaddr is a valid netmask. Returns 0 if the mask
3067  * is acceptable (i.e. of the form 1...10....0).
3068  */
3069 int
3070 checkmask(struct sockaddr *sa)
3071 {
3072         u_char *mask;
3073         int i, len;
3074
3075         if ((mask = sa_rawaddr(sa, &len)) == NULL)
3076                 return (-1);
3077
3078         for (i = 0; i < len; i++)
3079                 if (mask[i] != 0xff)
3080                         break;
3081         if (i < len) {
3082                 if (~mask[i] & (u_char)(~mask[i] + 1))
3083                         return (-1);
3084                 i++;
3085         }
3086         for (; i < len; i++)
3087                 if (mask[i] != 0)
3088                         return (-1);
3089         return (0);
3090 }
3091
3092 /*
3093  * Compare two sockaddrs according to a specified mask. Return zero if
3094  * `sa1' matches `sa2' when filtered by the netmask in `samask'.
3095  * If samask is NULL, perform a full comparision.
3096  */
3097 int
3098 sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask)
3099 {
3100         unsigned char *p1, *p2, *mask;
3101         int len, i;
3102
3103         if (sa1->sa_family != sa2->sa_family ||
3104             (p1 = sa_rawaddr(sa1, &len)) == NULL ||
3105             (p2 = sa_rawaddr(sa2, NULL)) == NULL)
3106                 return (1);
3107
3108         switch (sa1->sa_family) {
3109         case AF_INET6:
3110                 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
3111                     ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
3112                         return (1);
3113                 break;
3114         }
3115
3116         /* Simple binary comparison if no mask specified. */
3117         if (samask == NULL)
3118                 return (memcmp(p1, p2, len));
3119
3120         /* Set up the mask, and do a mask-based comparison. */
3121         if (sa1->sa_family != samask->sa_family ||
3122             (mask = sa_rawaddr(samask, NULL)) == NULL)
3123                 return (1);
3124
3125         for (i = 0; i < len; i++)
3126                 if ((p1[i] & mask[i]) != (p2[i] & mask[i]))
3127                         return (1);
3128         return (0);
3129 }
3130
3131 /*
3132  * Return a pointer to the part of the sockaddr that contains the
3133  * raw address, and set *nbytes to its length in bytes. Returns
3134  * NULL if the address family is unknown.
3135  */
3136 void *
3137 sa_rawaddr(struct sockaddr *sa, int *nbytes) {
3138         void *p;
3139         int len;
3140
3141         switch (sa->sa_family) {
3142         case AF_INET:
3143                 len = sizeof(((struct sockaddr_in *)sa)->sin_addr);
3144                 p = &((struct sockaddr_in *)sa)->sin_addr;
3145                 break;
3146         case AF_INET6:
3147                 len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr);
3148                 p = &((struct sockaddr_in6 *)sa)->sin6_addr;
3149                 break;
3150         default:
3151                 p = NULL;
3152                 len = 0;
3153         }
3154
3155         if (nbytes != NULL)
3156                 *nbytes = len;
3157         return (p);
3158 }
3159
3160 void
3161 huphandler(int sig __unused)
3162 {
3163         got_sighup = 1;
3164 }
3165
3166 void terminate(int sig __unused)
3167 {
3168         pidfile_remove(pfh);
3169         rpcb_unset(MOUNTPROG, MOUNTVERS, NULL);
3170         rpcb_unset(MOUNTPROG, MOUNTVERS3, NULL);
3171         exit (0);
3172 }
3173