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  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#) Copyright (c) 1989, 1993 The Regents of the University of California.  All rights reserved.
  37  * @(#)mountd.c 8.15 (Berkeley) 5/1/95
  38  * $FreeBSD: src/sbin/mountd/mountd.c,v 1.39.2.5 2002/09/13 15:57:43 joerg Exp $
  39  * $DragonFly: src/sbin/mountd/mountd.c,v 1.9 2008/02/05 20:49:51 dillon Exp $
  40  */
  41
  42 #include <sys/param.h>
  43 #include <sys/mount.h>
  44 #include <sys/mountctl.h>
  45 #include <sys/stat.h>
  46 #include <sys/syslog.h>
  47 #include <sys/sysctl.h>
  48
  49 #include <rpc/rpc.h>
  50 #include <rpc/pmap_clnt.h>
  51 #include <vfs/nfs/rpcv2.h>
  52 #include <vfs/nfs/nfsproto.h>
  53 #include <vfs/nfs/nfs.h>
  54 #include <vfs/ufs/ufsmount.h>
  55 #include <vfs/msdosfs/msdosfsmount.h>
  56 #include <vfs/ntfs/ntfsmount.h>
  57 #include <vfs/isofs/cd9660/cd9660_mount.h>      /* XXX need isofs in include */
  58
  59 #include <arpa/inet.h>
  60
  61 #include <ctype.h>
  62 #include <err.h>
  63 #include <errno.h>
  64 #include <grp.h>
  65 #include <netdb.h>
  66 #include <pwd.h>
  67 #include <signal.h>
  68 #include <stdio.h>
  69 #include <stdlib.h>
  70 #include <string.h>
  71 #include <unistd.h>
  72 #include "pathnames.h"
  73
  74 #ifdef DEBUG
  75 #include <stdarg.h>
  76 #endif
  77
  78 /*
  79  * Structures for keeping the mount list and export list
  80  */
  81 struct mountlist {
  82         struct mountlist *ml_next;
  83         char    ml_host[RPCMNT_NAMELEN+1];
  84         char    ml_dirp[RPCMNT_PATHLEN+1];
  85 };
  86
  87 struct dirlist {
  88         struct dirlist  *dp_left;
  89         struct dirlist  *dp_right;
  90         int             dp_flag;
  91         struct hostlist *dp_hosts;      /* List of hosts this dir exported to */
  92         char            dp_dirp[1];     /* Actually malloc'd to size of dir */
  93 };
  94 /* dp_flag bits */
  95 #define DP_DEFSET       0x1
  96 #define DP_HOSTSET      0x2
  97 #define DP_KERB         0x4
  98
  99 struct exportlist {
 100         struct exportlist *ex_next;
 101         struct dirlist  *ex_dirl;
 102         struct dirlist  *ex_defdir;
 103         int             ex_flag;
 104         fsid_t          ex_fs;
 105         char            *ex_fsdir;
 106         char            *ex_indexfile;
 107 };
 108 /* ex_flag bits */
 109 #define EX_LINKED       0x1
 110
 111 struct netmsk {
 112         u_int32_t       nt_net;
 113         u_int32_t       nt_mask;
 114         char            *nt_name;
 115 };
 116
 117 union grouptypes {
 118         struct hostent *gt_hostent;
 119         struct netmsk   gt_net;
 120 };
 121
 122 struct grouplist {
 123         int gr_type;
 124         union grouptypes gr_ptr;
 125         struct grouplist *gr_next;
 126 };
 127 /* Group types */
 128 #define GT_NULL         0x0
 129 #define GT_HOST         0x1
 130 #define GT_NET          0x2
 131 #define GT_IGNORE       0x5
 132
 133 struct hostlist {
 134         int              ht_flag;       /* Uses DP_xx bits */
 135         struct grouplist *ht_grp;
 136         struct hostlist  *ht_next;
 137 };
 138
 139 struct fhreturn {
 140         int     fhr_flag;
 141         int     fhr_vers;
 142         nfsfh_t fhr_fh;
 143 };
 144
 145 /* Global defs */
 146 char    *add_expdir(struct dirlist **, char *, int);
 147 void    add_dlist(struct dirlist **, struct dirlist *,
 148                                 struct grouplist *, int);
 149 void    add_mlist(char *, char *);
 150 int     check_dirpath(char *);
 151 int     check_options(struct dirlist *);
 152 int     chk_host(struct dirlist *, u_int32_t, int *, int *);
 153 void    del_mlist(char *, char *);
 154 struct dirlist *dirp_search(struct dirlist *, char *);
 155 int     do_mount(struct exportlist *, struct grouplist *, int,
 156                 struct ucred *, char *, int, struct statfs *);
 157 int     do_opt(char **, char **, struct exportlist *, struct grouplist *,
 158                                 int *, int *, struct ucred *);
 159 struct  exportlist *ex_search(fsid_t *);
 160 struct  exportlist *get_exp(void);
 161 void    free_dir(struct dirlist *);
 162 void    free_exp(struct exportlist *);
 163 void    free_grp(struct grouplist *);
 164 void    free_host(struct hostlist *);
 165 void    get_exportlist(void);
 166 int     get_host(char *, struct grouplist *, struct grouplist *);
 167 int     get_num(char *);
 168 struct hostlist *get_ht(void);
 169 int     get_line(void);
 170 void    get_mountlist(void);
 171 int     get_net(char *, struct netmsk *, int);
 172 void    getexp_err(struct exportlist *, struct grouplist *);
 173 struct grouplist *get_grp(void);
 174 void    hang_dirp(struct dirlist *, struct grouplist *,
 175                                 struct exportlist *, int);
 176 void    mntsrv(struct svc_req *, SVCXPRT *);
 177 void    nextfield(char **, char **);
 178 void    out_of_mem(void);
 179 void    parsecred(char *, struct ucred *);
 180 int     put_exlist(struct dirlist *, XDR *, struct dirlist *, int *);
 181 int     scan_tree(struct dirlist *, u_int32_t);
 182 static void usage(void);
 183 int     xdr_dir(XDR *, char *);
 184 int     xdr_explist(XDR *, caddr_t);
 185 int     xdr_fhs(XDR *, caddr_t);
 186 int     xdr_mlist(XDR *, caddr_t);
 187
 188 struct exportlist *exphead;
 189 struct mountlist *mlhead;
 190 struct grouplist *grphead;
 191 char exname[MAXPATHLEN];
 192 struct ucred def_anon = {
 193         1,
 194         (uid_t) -2,
 195         1,
 196         { (gid_t) -2 }
 197 };
 198 int force_v2 = 0;
 199 int resvport_only = 1;
 200 int dir_only = 1;
 201 int do_log = 0;
 202 int opt_flags;
 203 /* Bits for above */
 204 #define OP_MAPROOT      0x01
 205 #define OP_MAPALL       0x02
 206 #define OP_KERB         0x04
 207 #define OP_MASK         0x08
 208 #define OP_NET          0x10
 209 #define OP_ALLDIRS      0x40
 210 /* 0x80 is OP_HAVEMASK in FreeBSD 5+ */
 211 #define OP_QUIET        0x100
 212
 213 #ifdef DEBUG
 214 int debug = 1;
 215 void    SYSLOG(int, const char *, ...);
 216 #define syslog SYSLOG
 217 #else
 218 int debug = 0;
 219 #endif
 220
 221 /*
 222  * Mountd server for NFS mount protocol as described in:
 223  * NFS: Network File System Protocol Specification, RFC1094, Appendix A
 224  * The optional arguments are the exports file name
 225  * default: _PATH_EXPORTS
 226  * and "-n" to allow nonroot mount.
 227  */
 228 int
 229 main(int argc, char **argv)
 230 {
 231         SVCXPRT *udptransp, *tcptransp;
 232         int c, error, mib[3];
 233         struct vfsconf vfc;
 234
 235         error = getvfsbyname("nfs", &vfc);
 236         if (error && vfsisloadable("nfs")) {
 237                 if(vfsload("nfs"))
 238                         err(1, "vfsload(nfs)");
 239                 endvfsent();    /* flush cache */
 240                 error = getvfsbyname("nfs", &vfc);
 241         }
 242         if (error)
 243                 errx(1, "NFS support is not available in the running kernel");
 244
 245         while ((c = getopt(argc, argv, "2dlnr")) != -1)
 246                 switch (c) {
 247                 case '2':
 248                         force_v2 = 1;
 249                         break;
 250                 case 'n':
 251                         resvport_only = 0;
 252                         break;
 253                 case 'r':
 254                         dir_only = 0;
 255                         break;
 256                 case 'd':
 257                         debug = debug ? 0 : 1;
 258                         break;
 259                 case 'l':
 260                         do_log = 1;
 261                         break;
 262                 default:
 263                         usage();
 264                 };
 265         argc -= optind;
 266         argv += optind;
 267         grphead = (struct grouplist *)NULL;
 268         exphead = (struct exportlist *)NULL;
 269         mlhead = (struct mountlist *)NULL;
 270         if (argc == 1) {
 271                 strncpy(exname, *argv, MAXPATHLEN-1);
 272                 exname[MAXPATHLEN-1] = '\0';
 273         } else
 274                 strcpy(exname, _PATH_EXPORTS);
 275         openlog("mountd", LOG_PID, LOG_DAEMON);
 276         if (debug)
 277                 warnx("getting export list");
 278         get_exportlist();
 279         if (debug)
 280                 warnx("getting mount list");
 281         get_mountlist();
 282         if (debug)
 283                 warnx("here we go");
 284         if (debug == 0) {
 285                 daemon(0, 0);
 286                 signal(SIGINT, SIG_IGN);
 287                 signal(SIGQUIT, SIG_IGN);
 288         }
 289         signal(SIGHUP, (void (*)(int)) get_exportlist);
 290         { FILE *pidfile = fopen(_PATH_MOUNTDPID, "w");
 291           if (pidfile != NULL) {
 292                 fprintf(pidfile, "%d\n", getpid());
 293                 fclose(pidfile);
 294           }
 295         }
 296         if (!resvport_only) {
 297                 mib[0] = CTL_VFS;
 298                 mib[1] = vfc.vfc_typenum;
 299                 mib[2] = NFS_NFSPRIVPORT;
 300                 if (sysctl(mib, 3, NULL, NULL, &resvport_only,
 301                     sizeof(resvport_only)) != 0 && errno != ENOENT) {
 302                         syslog(LOG_ERR, "sysctl: %m");
 303                         exit(1);
 304                 }
 305         }
 306         if ((udptransp = svcudp_create(RPC_ANYSOCK)) == NULL ||
 307             (tcptransp = svctcp_create(RPC_ANYSOCK, 0, 0)) == NULL) {
 308                 syslog(LOG_ERR, "can't create socket");
 309                 exit(1);
 310         }
 311         pmap_unset(RPCPROG_MNT, 1);
 312         pmap_unset(RPCPROG_MNT, 3);
 313         if (!force_v2)
 314                 if (!svc_register(udptransp, RPCPROG_MNT, 3, mntsrv, IPPROTO_UDP) ||
 315                     !svc_register(tcptransp, RPCPROG_MNT, 3, mntsrv, IPPROTO_TCP)) {
 316                         syslog(LOG_ERR, "can't register mount");
 317                         exit(1);
 318                 }
 319         if (!svc_register(udptransp, RPCPROG_MNT, 1, mntsrv, IPPROTO_UDP) ||
 320             !svc_register(tcptransp, RPCPROG_MNT, 1, mntsrv, IPPROTO_TCP)) {
 321                 syslog(LOG_ERR, "can't register mount");
 322                 exit(1);
 323         }
 324         svc_run();
 325         syslog(LOG_ERR, "mountd died");
 326         exit(1);
 327 }
 328
 329 static void
 330 usage(void)
 331 {
 332         fprintf(stderr,
 333                 "usage: mountd [-2] [-d] [-l] [-n] [-r] [export_file]\n");
 334         exit(1);
 335 }
 336
 337 /*
 338  * The mount rpc service
 339  */
 340 void
 341 mntsrv(struct svc_req *rqstp, SVCXPRT *transp)
 342 {
 343         struct exportlist *ep;
 344         struct dirlist *dp;
 345         struct fhreturn fhr;
 346         struct stat stb;
 347         struct statfs fsb;
 348         struct hostent *hp;
 349         struct in_addr saddrin;
 350         u_int32_t saddr;
 351         u_short sport;
 352         char rpcpath[RPCMNT_PATHLEN + 1], dirpath[MAXPATHLEN];
 353         int bad = 0, defset, hostset;
 354         sigset_t sighup_mask;
 355
 356         sigemptyset(&sighup_mask);
 357         sigaddset(&sighup_mask, SIGHUP);
 358         saddr = transp->xp_raddr.sin_addr.s_addr;
 359         saddrin = transp->xp_raddr.sin_addr;
 360         sport = ntohs(transp->xp_raddr.sin_port);
 361         hp = (struct hostent *)NULL;
 362         switch (rqstp->rq_proc) {
 363         case NULLPROC:
 364                 if (!svc_sendreply(transp, xdr_void, (caddr_t)NULL))
 365                         syslog(LOG_ERR, "can't send reply");
 366                 return;
 367         case RPCMNT_MOUNT:
 368                 if (sport >= IPPORT_RESERVED && resvport_only) {
 369                         syslog(LOG_NOTICE,
 370                             "mount request from %s from unprivileged port",
 371                             inet_ntoa(saddrin));
 372                         svcerr_weakauth(transp);
 373                         return;
 374                 }
 375                 if (!svc_getargs(transp, xdr_dir, rpcpath)) {
 376                         syslog(LOG_NOTICE, "undecodable mount request from %s",
 377                             inet_ntoa(saddrin));
 378                         svcerr_decode(transp);
 379                         return;
 380                 }
 381
 382                 /*
 383                  * Get the real pathname and make sure it is a directory
 384                  * or a regular file if the -r option was specified
 385                  * and it exists.
 386                  */
 387                 if (realpath(rpcpath, dirpath) == NULL ||
 388                     stat(dirpath, &stb) < 0 ||
 389                     (!S_ISDIR(stb.st_mode) &&
 390                      (dir_only || !S_ISREG(stb.st_mode))) ||
 391                     statfs(dirpath, &fsb) < 0) {
 392                         chdir("/");     /* Just in case realpath doesn't */
 393                         syslog(LOG_NOTICE,
 394                             "mount request from %s for non existent path %s",
 395                             inet_ntoa(saddrin), dirpath);
 396                         if (debug)
 397                                 warnx("stat failed on %s", dirpath);
 398                         bad = ENOENT;   /* We will send error reply later */
 399                 }
 400
 401                 /* Check in the exports list */
 402                 sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
 403                 ep = ex_search(&fsb.f_fsid);
 404                 hostset = defset = 0;
 405                 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset) ||
 406                     ((dp = dirp_search(ep->ex_dirl, dirpath)) &&
 407                      chk_host(dp, saddr, &defset, &hostset)) ||
 408                      (defset && scan_tree(ep->ex_defdir, saddr) == 0 &&
 409                       scan_tree(ep->ex_dirl, saddr) == 0))) {
 410                         if (bad) {
 411                                 if (!svc_sendreply(transp, xdr_long,
 412                                     (caddr_t)&bad))
 413                                         syslog(LOG_ERR, "can't send reply");
 414                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 415                                 return;
 416                         }
 417                         if (hostset & DP_HOSTSET)
 418                                 fhr.fhr_flag = hostset;
 419                         else
 420                                 fhr.fhr_flag = defset;
 421                         fhr.fhr_vers = rqstp->rq_vers;
 422                         /* Get the file handle */
 423                         memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t));
 424                         if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) {
 425                                 bad = errno;
 426                                 syslog(LOG_ERR, "can't get fh for %s", dirpath);
 427                                 if (!svc_sendreply(transp, xdr_long,
 428                                     (caddr_t)&bad))
 429                                         syslog(LOG_ERR, "can't send reply");
 430                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 431                                 return;
 432                         }
 433                         if (!svc_sendreply(transp, xdr_fhs, (caddr_t)&fhr))
 434                                 syslog(LOG_ERR, "can't send reply");
 435                         if (hp == NULL)
 436                                 hp = gethostbyaddr((caddr_t)&saddr,
 437                                     sizeof(saddr), AF_INET);
 438                         if (hp)
 439                                 add_mlist(hp->h_name, dirpath);
 440                         else
 441                                 add_mlist(inet_ntoa(saddrin),
 442                                         dirpath);
 443                         if (debug)
 444                                 warnx("mount successful");
 445                         if (do_log)
 446                                 syslog(LOG_NOTICE,
 447                                     "mount request succeeded from %s for %s",
 448                                     inet_ntoa(saddrin), dirpath);
 449                 } else {
 450                         bad = EACCES;
 451                         syslog(LOG_NOTICE,
 452                             "mount request denied from %s for %s",
 453                             inet_ntoa(saddrin), dirpath);
 454                 }
 455
 456                 if (bad && !svc_sendreply(transp, xdr_long, (caddr_t)&bad))
 457                         syslog(LOG_ERR, "can't send reply");
 458                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 459                 return;
 460         case RPCMNT_DUMP:
 461                 if (!svc_sendreply(transp, xdr_mlist, (caddr_t)NULL))
 462                         syslog(LOG_ERR, "can't send reply");
 463                 else if (do_log)
 464                         syslog(LOG_NOTICE,
 465                             "dump request succeeded from %s",
 466                             inet_ntoa(saddrin));
 467                 return;
 468         case RPCMNT_UMOUNT:
 469                 if (sport >= IPPORT_RESERVED && resvport_only) {
 470                         syslog(LOG_NOTICE,
 471                             "umount request from %s from unprivileged port",
 472                             inet_ntoa(saddrin));
 473                         svcerr_weakauth(transp);
 474                         return;
 475                 }
 476                 if (!svc_getargs(transp, xdr_dir, rpcpath)) {
 477                         syslog(LOG_NOTICE, "undecodable umount request from %s",
 478                             inet_ntoa(saddrin));
 479                         svcerr_decode(transp);
 480                         return;
 481                 }
 482                 if (realpath(rpcpath, dirpath) == NULL) {
 483                         syslog(LOG_NOTICE, "umount request from %s "
 484                             "for non existent path %s",
 485                             inet_ntoa(saddrin), dirpath);
 486                 }
 487                 if (!svc_sendreply(transp, xdr_void, (caddr_t)NULL))
 488                         syslog(LOG_ERR, "can't send reply");
 489                 hp = gethostbyaddr((caddr_t)&saddr, sizeof(saddr), AF_INET);
 490                 if (hp)
 491                         del_mlist(hp->h_name, dirpath);
 492                 del_mlist(inet_ntoa(saddrin), dirpath);
 493                 if (do_log)
 494                         syslog(LOG_NOTICE,
 495                             "umount request succeeded from %s for %s",
 496                             inet_ntoa(saddrin), dirpath);
 497                 return;
 498         case RPCMNT_UMNTALL:
 499                 if (sport >= IPPORT_RESERVED && resvport_only) {
 500                         syslog(LOG_NOTICE,
 501                             "umountall request from %s from unprivileged port",
 502                             inet_ntoa(saddrin));
 503                         svcerr_weakauth(transp);
 504                         return;
 505                 }
 506                 if (!svc_sendreply(transp, xdr_void, (caddr_t)NULL))
 507                         syslog(LOG_ERR, "can't send reply");
 508                 hp = gethostbyaddr((caddr_t)&saddr, sizeof(saddr), AF_INET);
 509                 if (hp)
 510                         del_mlist(hp->h_name, (char *)NULL);
 511                 del_mlist(inet_ntoa(saddrin), (char *)NULL);
 512                 if (do_log)
 513                         syslog(LOG_NOTICE,
 514                             "umountall request succeeded from %s",
 515                             inet_ntoa(saddrin));
 516                 return;
 517         case RPCMNT_EXPORT:
 518                 if (!svc_sendreply(transp, xdr_explist, (caddr_t)NULL))
 519                         syslog(LOG_ERR, "can't send reply");
 520                 if (do_log)
 521                         syslog(LOG_NOTICE,
 522                             "export request succeeded from %s",
 523                             inet_ntoa(saddrin));
 524                 return;
 525         default:
 526                 svcerr_noproc(transp);
 527                 return;
 528         }
 529 }
 530
 531 /*
 532  * Xdr conversion for a dirpath string
 533  */
 534 int
 535 xdr_dir(XDR *xdrsp, char *dirp)
 536 {
 537         return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
 538 }
 539
 540 /*
 541  * Xdr routine to generate file handle reply
 542  */
 543 int
 544 xdr_fhs(XDR *xdrsp, caddr_t cp)
 545 {
 546         struct fhreturn *fhrp = (struct fhreturn *)cp;
 547         u_long ok = 0, len, auth;
 548
 549         if (!xdr_long(xdrsp, &ok))
 550                 return (0);
 551         switch (fhrp->fhr_vers) {
 552         case 1:
 553                 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH));
 554         case 3:
 555                 len = NFSX_V3FH;
 556                 if (!xdr_long(xdrsp, &len))
 557                         return (0);
 558                 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len))
 559                         return (0);
 560                 if (fhrp->fhr_flag & DP_KERB)
 561                         auth = RPCAUTH_KERB4;
 562                 else
 563                         auth = RPCAUTH_UNIX;
 564                 len = 1;
 565                 if (!xdr_long(xdrsp, &len))
 566                         return (0);
 567                 return (xdr_long(xdrsp, &auth));
 568         };
 569         return (0);
 570 }
 571
 572 int
 573 xdr_mlist(XDR *xdrsp, caddr_t cp)
 574 {
 575         struct mountlist *mlp;
 576         int true = 1;
 577         int false = 0;
 578         char *strp;
 579
 580         mlp = mlhead;
 581         while (mlp) {
 582                 if (!xdr_bool(xdrsp, &true))
 583                         return (0);
 584                 strp = &mlp->ml_host[0];
 585                 if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
 586                         return (0);
 587                 strp = &mlp->ml_dirp[0];
 588                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 589                         return (0);
 590                 mlp = mlp->ml_next;
 591         }
 592         if (!xdr_bool(xdrsp, &false))
 593                 return (0);
 594         return (1);
 595 }
 596
 597 /*
 598  * Xdr conversion for export list
 599  */
 600 int
 601 xdr_explist(XDR *xdrsp, caddr_t cp)
 602 {
 603         struct exportlist *ep;
 604         int false = 0;
 605         int putdef;
 606         sigset_t sighup_mask;
 607
 608         sigemptyset(&sighup_mask);
 609         sigaddset(&sighup_mask, SIGHUP);
 610         sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
 611         ep = exphead;
 612         while (ep) {
 613                 putdef = 0;
 614                 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir, &putdef))
 615                         goto errout;
 616                 if (ep->ex_defdir && putdef == 0 &&
 617                         put_exlist(ep->ex_defdir, xdrsp, (struct dirlist *)NULL,
 618                         &putdef))
 619                         goto errout;
 620                 ep = ep->ex_next;
 621         }
 622         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 623         if (!xdr_bool(xdrsp, &false))
 624                 return (0);
 625         return (1);
 626 errout:
 627         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 628         return (0);
 629 }
 630
 631 /*
 632  * Called from xdr_explist() to traverse the tree and export the
 633  * directory paths.
 634  */
 635 int
 636 put_exlist(struct dirlist *dp, XDR *xdrsp, struct dirlist *adp, int *putdefp)
 637 {
 638         struct grouplist *grp;
 639         struct hostlist *hp;
 640         int true = 1;
 641         int false = 0;
 642         int gotalldir = 0;
 643         char *strp;
 644
 645         if (dp) {
 646                 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp))
 647                         return (1);
 648                 if (!xdr_bool(xdrsp, &true))
 649                         return (1);
 650                 strp = dp->dp_dirp;
 651                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 652                         return (1);
 653                 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) {
 654                         gotalldir = 1;
 655                         *putdefp = 1;
 656                 }
 657                 if ((dp->dp_flag & DP_DEFSET) == 0 &&
 658                     (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) {
 659                         hp = dp->dp_hosts;
 660                         while (hp) {
 661                                 grp = hp->ht_grp;
 662                                 if (grp->gr_type == GT_HOST) {
 663                                         if (!xdr_bool(xdrsp, &true))
 664                                                 return (1);
 665                                         strp = grp->gr_ptr.gt_hostent->h_name;
 666                                         if (!xdr_string(xdrsp, &strp,
 667                                             RPCMNT_NAMELEN))
 668                                                 return (1);
 669                                 } else if (grp->gr_type == GT_NET) {
 670                                         if (!xdr_bool(xdrsp, &true))
 671                                                 return (1);
 672                                         strp = grp->gr_ptr.gt_net.nt_name;
 673                                         if (!xdr_string(xdrsp, &strp,
 674                                             RPCMNT_NAMELEN))
 675                                                 return (1);
 676                                 }
 677                                 hp = hp->ht_next;
 678                                 if (gotalldir && hp == (struct hostlist *)NULL) {
 679                                         hp = adp->dp_hosts;
 680                                         gotalldir = 0;
 681                                 }
 682                         }
 683                 }
 684                 if (!xdr_bool(xdrsp, &false))
 685                         return (1);
 686                 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp))
 687                         return (1);
 688         }
 689         return (0);
 690 }
 691
 692 #define LINESIZ 10240
 693 char line[LINESIZ];
 694 FILE *exp_file;
 695
 696 /*
 697  * Get the export list
 698  */
 699 void
 700 get_exportlist(void)
 701 {
 702         struct exportlist *ep, *ep2;
 703         struct grouplist *grp, *tgrp;
 704         struct exportlist **epp;
 705         struct dirlist *dirhead;
 706         struct statfs fsb, *fsp;
 707         struct hostent *hpe;
 708         struct ucred anon;
 709         char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc;
 710         int len, has_host, exflags, got_nondir, dirplen, num, i, netgrp;
 711
 712         dirp = NULL;
 713         dirplen = 0;
 714
 715         /*
 716          * First, get rid of the old list
 717          */
 718         ep = exphead;
 719         while (ep) {
 720                 ep2 = ep;
 721                 ep = ep->ex_next;
 722                 free_exp(ep2);
 723         }
 724         exphead = (struct exportlist *)NULL;
 725
 726         grp = grphead;
 727         while (grp) {
 728                 tgrp = grp;
 729                 grp = grp->gr_next;
 730                 free_grp(tgrp);
 731         }
 732         grphead = (struct grouplist *)NULL;
 733
 734         /*
 735          * And delete exports that are in the kernel for all local
 736          * file systems.
 737          * XXX: Should know how to handle all local exportable file systems
 738          *      instead of just "ufs".
 739          */
 740         num = getmntinfo(&fsp, MNT_NOWAIT);
 741         for (i = 0; i < num; i++) {
 742                 union {
 743                         struct ufs_args ua;
 744                         struct iso_args ia;
 745                         struct mfs_args ma;
 746                         struct msdosfs_args da;
 747                         struct ntfs_args na;
 748                 } targs;
 749                 struct export_args export;
 750
 751                 export.ex_flags = MNT_DELEXPORT;
 752                 if (mountctl(fsp->f_mntonname, MOUNTCTL_SET_EXPORT, -1,
 753                              &export, sizeof(export), NULL, 0) == 0) {
 754                 } else if (!strcmp(fsp->f_fstypename, "mfs") ||
 755                     !strcmp(fsp->f_fstypename, "ufs") ||
 756                     !strcmp(fsp->f_fstypename, "msdos") ||
 757                     !strcmp(fsp->f_fstypename, "ntfs") ||
 758                     !strcmp(fsp->f_fstypename, "cd9660")) {
 759                         targs.ua.fspec = NULL;
 760                         targs.ua.export.ex_flags = MNT_DELEXPORT;
 761                         if (mount(fsp->f_fstypename, fsp->f_mntonname,
 762                                   fsp->f_flags | MNT_UPDATE,
 763                                   (caddr_t)&targs) < 0)
 764                                 syslog(LOG_ERR, "can't delete exports for %s",
 765                                        fsp->f_mntonname);
 766                 }
 767                 fsp++;
 768         }
 769
 770         /*
 771          * Read in the exports file and build the list, calling
 772          * mount() as we go along to push the export rules into the kernel.
 773          */
 774         if ((exp_file = fopen(exname, "r")) == NULL) {
 775                 syslog(LOG_ERR, "can't open %s", exname);
 776                 exit(2);
 777         }
 778         dirhead = (struct dirlist *)NULL;
 779         while (get_line()) {
 780                 if (debug)
 781                         warnx("got line %s", line);
 782                 cp = line;
 783                 nextfield(&cp, &endcp);
 784                 if (*cp == '#')
 785                         goto nextline;
 786
 787                 /*
 788                  * Set defaults.
 789                  */
 790                 has_host = FALSE;
 791                 anon = def_anon;
 792                 exflags = MNT_EXPORTED;
 793                 got_nondir = 0;
 794                 opt_flags = 0;
 795                 ep = (struct exportlist *)NULL;
 796
 797                 /*
 798                  * Create new exports list entry
 799                  */
 800                 len = endcp-cp;
 801                 tgrp = grp = get_grp();
 802                 while (len > 0) {
 803                         if (len > RPCMNT_NAMELEN) {
 804                             getexp_err(ep, tgrp);
 805                             goto nextline;
 806                         }
 807                         if (*cp == '-') {
 808                             if (ep == (struct exportlist *)NULL) {
 809                                 getexp_err(ep, tgrp);
 810                                 goto nextline;
 811                             }
 812                             if (debug)
 813                                 warnx("doing opt %s", cp);
 814                             got_nondir = 1;
 815                             if (do_opt(&cp, &endcp, ep, grp, &has_host,
 816                                 &exflags, &anon)) {
 817                                 getexp_err(ep, tgrp);
 818                                 goto nextline;
 819                             }
 820                         } else if (*cp == '/') {
 821                             savedc = *endcp;
 822                             *endcp = '\0';
 823                             if (check_dirpath(cp) &&
 824                                 statfs(cp, &fsb) >= 0) {
 825                                 if (got_nondir) {
 826                                     syslog(LOG_ERR, "dirs must be first");
 827                                     getexp_err(ep, tgrp);
 828                                     goto nextline;
 829                                 }
 830                                 if (ep) {
 831                                     if (ep->ex_fs.val[0] != fsb.f_fsid.val[0] ||
 832                                         ep->ex_fs.val[1] != fsb.f_fsid.val[1]) {
 833                                         getexp_err(ep, tgrp);
 834                                         goto nextline;
 835                                     }
 836                                 } else {
 837                                     /*
 838                                      * See if this directory is already
 839                                      * in the list.
 840                                      */
 841                                     ep = ex_search(&fsb.f_fsid);
 842                                     if (ep == (struct exportlist *)NULL) {
 843                                         ep = get_exp();
 844                                         ep->ex_fs = fsb.f_fsid;
 845                                         ep->ex_fsdir = (char *)
 846                                             malloc(strlen(fsb.f_mntonname) + 1);
 847                                         if (ep->ex_fsdir)
 848                                             strcpy(ep->ex_fsdir,
 849                                                 fsb.f_mntonname);
 850                                         else
 851                                             out_of_mem();
 852                                         if (debug)
 853                                           warnx("making new ep fs=0x%x,0x%x",
 854                                               fsb.f_fsid.val[0],
 855                                               fsb.f_fsid.val[1]);
 856                                     } else if (debug)
 857                                         warnx("found ep fs=0x%x,0x%x",
 858                                             fsb.f_fsid.val[0],
 859                                             fsb.f_fsid.val[1]);
 860                                 }
 861
 862                                 /*
 863                                  * Add dirpath to export mount point.
 864                                  */
 865                                 dirp = add_expdir(&dirhead, cp, len);
 866                                 dirplen = len;
 867                             } else {
 868                                 getexp_err(ep, tgrp);
 869                                 goto nextline;
 870                             }
 871                             *endcp = savedc;
 872                         } else {
 873                             savedc = *endcp;
 874                             *endcp = '\0';
 875                             got_nondir = 1;
 876                             if (ep == (struct exportlist *)NULL) {
 877                                 getexp_err(ep, tgrp);
 878                                 goto nextline;
 879                             }
 880
 881                             /*
 882                              * Get the host or netgroup.
 883                              */
 884                             setnetgrent(cp);
 885                             netgrp = getnetgrent(&hst, &usr, &dom);
 886                             do {
 887                                 if (has_host) {
 888                                     grp->gr_next = get_grp();
 889                                     grp = grp->gr_next;
 890                                 }
 891                                 if (netgrp) {
 892                                     if (hst == 0) {
 893                                         syslog(LOG_ERR,
 894                                 "null hostname in netgroup %s, skipping", cp);
 895                                         grp->gr_type = GT_IGNORE;
 896                                     } else if (get_host(hst, grp, tgrp)) {
 897                                         syslog(LOG_ERR,
 898                         "bad host %s in netgroup %s, skipping", hst, cp);
 899                                         grp->gr_type = GT_IGNORE;
 900                                     }
 901                                 } else if (get_host(cp, grp, tgrp)) {
 902                                     syslog(LOG_ERR, "bad host %s, skipping", cp);
 903                                     grp->gr_type = GT_IGNORE;
 904                                 }
 905                                 has_host = TRUE;
 906                             } while (netgrp && getnetgrent(&hst, &usr, &dom));
 907                             endnetgrent();
 908                             *endcp = savedc;
 909                         }
 910                         cp = endcp;
 911                         nextfield(&cp, &endcp);
 912                         len = endcp - cp;
 913                 }
 914                 if (check_options(dirhead)) {
 915                         getexp_err(ep, tgrp);
 916                         goto nextline;
 917                 }
 918                 if (!has_host) {
 919                         grp->gr_type = GT_HOST;
 920                         if (debug)
 921                                 warnx("adding a default entry");
 922                         /* add a default group and make the grp list NULL */
 923                         hpe = (struct hostent *)malloc(sizeof(struct hostent));
 924                         if (hpe == (struct hostent *)NULL)
 925                                 out_of_mem();
 926                         hpe->h_name = strdup("Default");
 927                         hpe->h_addrtype = AF_INET;
 928                         hpe->h_length = sizeof (u_int32_t);
 929                         hpe->h_addr_list = (char **)NULL;
 930                         grp->gr_ptr.gt_hostent = hpe;
 931
 932                 /*
 933                  * Don't allow a network export coincide with a list of
 934                  * host(s) on the same line.
 935                  */
 936                 } else if ((opt_flags & OP_NET) && tgrp->gr_next) {
 937                         getexp_err(ep, tgrp);
 938                         goto nextline;
 939
 940                 /*
 941                  * If an export list was specified on this line, make sure
 942                  * that we have at least one valid entry, otherwise skip it.
 943                  */
 944                 } else {
 945                         grp = tgrp;
 946                         while (grp && grp->gr_type == GT_IGNORE)
 947                                 grp = grp->gr_next;
 948                         if (! grp) {
 949                             getexp_err(ep, tgrp);
 950                             goto nextline;
 951                         }
 952                 }
 953
 954                 /*
 955                  * Loop through hosts, pushing the exports into the kernel.
 956                  * After loop, tgrp points to the start of the list and
 957                  * grp points to the last entry in the list.
 958                  */
 959                 grp = tgrp;
 960                 do {
 961                     if (do_mount(ep, grp, exflags, &anon, dirp,
 962                         dirplen, &fsb)) {
 963                         getexp_err(ep, tgrp);
 964                         goto nextline;
 965                     }
 966                 } while (grp->gr_next && (grp = grp->gr_next));
 967
 968                 /*
 969                  * Success. Update the data structures.
 970                  */
 971                 if (has_host) {
 972                         hang_dirp(dirhead, tgrp, ep, opt_flags);
 973                         grp->gr_next = grphead;
 974                         grphead = tgrp;
 975                 } else {
 976                         hang_dirp(dirhead, (struct grouplist *)NULL, ep,
 977                                 opt_flags);
 978                         free_grp(grp);
 979                 }
 980                 dirhead = (struct dirlist *)NULL;
 981                 if ((ep->ex_flag & EX_LINKED) == 0) {
 982                         ep2 = exphead;
 983                         epp = &exphead;
 984
 985                         /*
 986                          * Insert in the list in alphabetical order.
 987                          */
 988                         while (ep2 && strcmp(ep2->ex_fsdir, ep->ex_fsdir) < 0) {
 989                                 epp = &ep2->ex_next;
 990                                 ep2 = ep2->ex_next;
 991                         }
 992                         if (ep2)
 993                                 ep->ex_next = ep2;
 994                         *epp = ep;
 995                         ep->ex_flag |= EX_LINKED;
 996                 }
 997 nextline:
 998                 if (dirhead) {
 999                         free_dir(dirhead);
1000                         dirhead = (struct dirlist *)NULL;
1001                 }
1002         }
1003         fclose(exp_file);
1004 }
1005
1006 /*
1007  * Allocate an export list element
1008  */
1009 struct exportlist *
1010 get_exp(void)
1011 {
1012         struct exportlist *ep;
1013
1014         ep = (struct exportlist *)malloc(sizeof (struct exportlist));
1015         if (ep == (struct exportlist *)NULL)
1016                 out_of_mem();
1017         memset(ep, 0, sizeof(struct exportlist));
1018         return (ep);
1019 }
1020
1021 /*
1022  * Allocate a group list element
1023  */
1024 struct grouplist *
1025 get_grp(void)
1026 {
1027         struct grouplist *gp;
1028
1029         gp = (struct grouplist *)malloc(sizeof (struct grouplist));
1030         if (gp == (struct grouplist *)NULL)
1031                 out_of_mem();
1032         memset(gp, 0, sizeof(struct grouplist));
1033         return (gp);
1034 }
1035
1036 /*
1037  * Clean up upon an error in get_exportlist().
1038  */
1039 void
1040 getexp_err(struct exportlist *ep, struct grouplist *grp)
1041 {
1042         struct grouplist *tgrp;
1043
1044         if (!(opt_flags & OP_QUIET))
1045                 syslog(LOG_ERR, "bad exports list line %s", line);
1046         if (ep && (ep->ex_flag & EX_LINKED) == 0)
1047                 free_exp(ep);
1048         while (grp) {
1049                 tgrp = grp;
1050                 grp = grp->gr_next;
1051                 free_grp(tgrp);
1052         }
1053 }
1054
1055 /*
1056  * Search the export list for a matching fs.
1057  */
1058 struct exportlist *
1059 ex_search(fsid_t *fsid)
1060 {
1061         struct exportlist *ep;
1062
1063         ep = exphead;
1064         while (ep) {
1065                 if (ep->ex_fs.val[0] == fsid->val[0] &&
1066                     ep->ex_fs.val[1] == fsid->val[1])
1067                         return (ep);
1068                 ep = ep->ex_next;
1069         }
1070         return (ep);
1071 }
1072
1073 /*
1074  * Add a directory path to the list.
1075  */
1076 char *
1077 add_expdir(struct dirlist **dpp, char *cp, int len)
1078 {
1079         struct dirlist *dp;
1080
1081         dp = (struct dirlist *)malloc(sizeof (struct dirlist) + len);
1082         if (dp == (struct dirlist *)NULL)
1083                 out_of_mem();
1084         dp->dp_left = *dpp;
1085         dp->dp_right = (struct dirlist *)NULL;
1086         dp->dp_flag = 0;
1087         dp->dp_hosts = (struct hostlist *)NULL;
1088         strcpy(dp->dp_dirp, cp);
1089         *dpp = dp;
1090         return (dp->dp_dirp);
1091 }
1092
1093 /*
1094  * Hang the dir list element off the dirpath binary tree as required
1095  * and update the entry for host.
1096  */
1097 void
1098 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep,
1099           int flags)
1100 {
1101         struct hostlist *hp;
1102         struct dirlist *dp2;
1103
1104         if (flags & OP_ALLDIRS) {
1105                 if (ep->ex_defdir)
1106                         free((caddr_t)dp);
1107                 else
1108                         ep->ex_defdir = dp;
1109                 if (grp == (struct grouplist *)NULL) {
1110                         ep->ex_defdir->dp_flag |= DP_DEFSET;
1111                         if (flags & OP_KERB)
1112                                 ep->ex_defdir->dp_flag |= DP_KERB;
1113                 } else while (grp) {
1114                         hp = get_ht();
1115                         if (flags & OP_KERB)
1116                                 hp->ht_flag |= DP_KERB;
1117                         hp->ht_grp = grp;
1118                         hp->ht_next = ep->ex_defdir->dp_hosts;
1119                         ep->ex_defdir->dp_hosts = hp;
1120                         grp = grp->gr_next;
1121                 }
1122         } else {
1123
1124                 /*
1125                  * Loop through the directories adding them to the tree.
1126                  */
1127                 while (dp) {
1128                         dp2 = dp->dp_left;
1129                         add_dlist(&ep->ex_dirl, dp, grp, flags);
1130                         dp = dp2;
1131                 }
1132         }
1133 }
1134
1135 /*
1136  * Traverse the binary tree either updating a node that is already there
1137  * for the new directory or adding the new node.
1138  */
1139 void
1140 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp,
1141           int flags)
1142 {
1143         struct dirlist *dp;
1144         struct hostlist *hp;
1145         int cmp;
1146
1147         dp = *dpp;
1148         if (dp) {
1149                 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp);
1150                 if (cmp > 0) {
1151                         add_dlist(&dp->dp_left, newdp, grp, flags);
1152                         return;
1153                 } else if (cmp < 0) {
1154                         add_dlist(&dp->dp_right, newdp, grp, flags);
1155                         return;
1156                 } else
1157                         free((caddr_t)newdp);
1158         } else {
1159                 dp = newdp;
1160                 dp->dp_left = (struct dirlist *)NULL;
1161                 *dpp = dp;
1162         }
1163         if (grp) {
1164
1165                 /*
1166                  * Hang all of the host(s) off of the directory point.
1167                  */
1168                 do {
1169                         hp = get_ht();
1170                         if (flags & OP_KERB)
1171                                 hp->ht_flag |= DP_KERB;
1172                         hp->ht_grp = grp;
1173                         hp->ht_next = dp->dp_hosts;
1174                         dp->dp_hosts = hp;
1175                         grp = grp->gr_next;
1176                 } while (grp);
1177         } else {
1178                 dp->dp_flag |= DP_DEFSET;
1179                 if (flags & OP_KERB)
1180                         dp->dp_flag |= DP_KERB;
1181         }
1182 }
1183
1184 /*
1185  * Search for a dirpath on the export point.
1186  */
1187 struct dirlist *
1188 dirp_search(struct dirlist *dp, char *dirpath)
1189 {
1190         int cmp;
1191
1192         if (dp) {
1193                 cmp = strcmp(dp->dp_dirp, dirpath);
1194                 if (cmp > 0)
1195                         return (dirp_search(dp->dp_left, dirpath));
1196                 else if (cmp < 0)
1197                         return (dirp_search(dp->dp_right, dirpath));
1198                 else
1199                         return (dp);
1200         }
1201         return (dp);
1202 }
1203
1204 /*
1205  * Scan for a host match in a directory tree.
1206  */
1207 int
1208 chk_host(struct dirlist *dp, u_int32_t saddr, int *defsetp, int *hostsetp)
1209 {
1210         struct hostlist *hp;
1211         struct grouplist *grp;
1212         u_int32_t **addrp;
1213
1214         if (dp) {
1215                 if (dp->dp_flag & DP_DEFSET)
1216                         *defsetp = dp->dp_flag;
1217                 hp = dp->dp_hosts;
1218                 while (hp) {
1219                         grp = hp->ht_grp;
1220                         switch (grp->gr_type) {
1221                         case GT_HOST:
1222                             addrp = (u_int32_t **)
1223                                 grp->gr_ptr.gt_hostent->h_addr_list;
1224                             while (*addrp) {
1225                                 if (**addrp == saddr) {
1226                                     *hostsetp = (hp->ht_flag | DP_HOSTSET);
1227                                     return (1);
1228                                 }
1229                                 addrp++;
1230                             }
1231                             break;
1232                         case GT_NET:
1233                             if ((saddr & grp->gr_ptr.gt_net.nt_mask) ==
1234                                 grp->gr_ptr.gt_net.nt_net) {
1235                                 *hostsetp = (hp->ht_flag | DP_HOSTSET);
1236                                 return (1);
1237                             }
1238                             break;
1239                         };
1240                         hp = hp->ht_next;
1241                 }
1242         }
1243         return (0);
1244 }
1245
1246 /*
1247  * Scan tree for a host that matches the address.
1248  */
1249 int
1250 scan_tree(struct dirlist *dp, u_int32_t saddr)
1251 {
1252         int defset, hostset;
1253
1254         if (dp) {
1255                 if (scan_tree(dp->dp_left, saddr))
1256                         return (1);
1257                 if (chk_host(dp, saddr, &defset, &hostset))
1258                         return (1);
1259                 if (scan_tree(dp->dp_right, saddr))
1260                         return (1);
1261         }
1262         return (0);
1263 }
1264
1265 /*
1266  * Traverse the dirlist tree and free it up.
1267  */
1268 void
1269 free_dir(struct dirlist *dp)
1270 {
1271
1272         if (dp) {
1273                 free_dir(dp->dp_left);
1274                 free_dir(dp->dp_right);
1275                 free_host(dp->dp_hosts);
1276                 free((caddr_t)dp);
1277         }
1278 }
1279
1280 /*
1281  * Parse the option string and update fields.
1282  * Option arguments may either be -<option>=<value> or
1283  * -<option> <value>
1284  */
1285 int
1286 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp,
1287        int *has_hostp, int *exflagsp, struct ucred *cr)
1288 {
1289         char *cpoptarg, *cpoptend;
1290         char *cp, *endcp, *cpopt, savedc, savedc2;
1291         int allflag, usedarg;
1292
1293         savedc2 = '\0';
1294         cpopt = *cpp;
1295         cpopt++;
1296         cp = *endcpp;
1297         savedc = *cp;
1298         *cp = '\0';
1299         while (cpopt && *cpopt) {
1300                 allflag = 1;
1301                 usedarg = -2;
1302                 if ((cpoptend = strchr(cpopt, ','))) {
1303                         *cpoptend++ = '\0';
1304                         if ((cpoptarg = strchr(cpopt, '=')))
1305                                 *cpoptarg++ = '\0';
1306                 } else {
1307                         if ((cpoptarg = strchr(cpopt, '=')))
1308                                 *cpoptarg++ = '\0';
1309                         else {
1310                                 *cp = savedc;
1311                                 nextfield(&cp, &endcp);
1312                                 **endcpp = '\0';
1313                                 if (endcp > cp && *cp != '-') {
1314                                         cpoptarg = cp;
1315                                         savedc2 = *endcp;
1316                                         *endcp = '\0';
1317                                         usedarg = 0;
1318                                 }
1319                         }
1320                 }
1321                 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) {
1322                         *exflagsp |= MNT_EXRDONLY;
1323                 } else if (cpoptarg && (!strcmp(cpopt, "maproot") ||
1324                     !(allflag = strcmp(cpopt, "mapall")) ||
1325                     !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) {
1326                         usedarg++;
1327                         parsecred(cpoptarg, cr);
1328                         if (allflag == 0) {
1329                                 *exflagsp |= MNT_EXPORTANON;
1330                                 opt_flags |= OP_MAPALL;
1331                         } else
1332                                 opt_flags |= OP_MAPROOT;
1333                 } else if (!strcmp(cpopt, "kerb") || !strcmp(cpopt, "k")) {
1334                         *exflagsp |= MNT_EXKERB;
1335                         opt_flags |= OP_KERB;
1336                 } else if (cpoptarg && (!strcmp(cpopt, "mask") ||
1337                         !strcmp(cpopt, "m"))) {
1338                         if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) {
1339                                 syslog(LOG_ERR, "bad mask: %s", cpoptarg);
1340                                 return (1);
1341                         }
1342                         usedarg++;
1343                         opt_flags |= OP_MASK;
1344                 } else if (cpoptarg && (!strcmp(cpopt, "network") ||
1345                         !strcmp(cpopt, "n"))) {
1346                         if (grp->gr_type != GT_NULL) {
1347                                 syslog(LOG_ERR, "network/host conflict");
1348                                 return (1);
1349                         } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) {
1350                                 syslog(LOG_ERR, "bad net: %s", cpoptarg);
1351                                 return (1);
1352                         }
1353                         grp->gr_type = GT_NET;
1354                         *has_hostp = 1;
1355                         usedarg++;
1356                         opt_flags |= OP_NET;
1357                 } else if (!strcmp(cpopt, "alldirs")) {
1358                         opt_flags |= OP_ALLDIRS;
1359                 } else if (!strcmp(cpopt, "public")) {
1360                         *exflagsp |= MNT_EXPUBLIC;
1361                 } else if (!strcmp(cpopt, "webnfs")) {
1362                         *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON);
1363                         opt_flags |= OP_MAPALL;
1364                 } else if (cpoptarg && !strcmp(cpopt, "index")) {
1365                         ep->ex_indexfile = strdup(cpoptarg);
1366                 } else if (!strcmp(cpopt, "quiet")) {
1367                         opt_flags |= OP_QUIET;
1368                 } else {
1369                         syslog(LOG_ERR, "bad opt %s", cpopt);
1370                         return (1);
1371                 }
1372                 if (usedarg >= 0) {
1373                         *endcp = savedc2;
1374                         **endcpp = savedc;
1375                         if (usedarg > 0) {
1376                                 *cpp = cp;
1377                                 *endcpp = endcp;
1378                         }
1379                         return (0);
1380                 }
1381                 cpopt = cpoptend;
1382         }
1383         **endcpp = savedc;
1384         return (0);
1385 }
1386
1387 /*
1388  * Translate a character string to the corresponding list of network
1389  * addresses for a hostname.
1390  */
1391 int
1392 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp)
1393 {
1394         struct grouplist *checkgrp;
1395         struct hostent *hp, *nhp;
1396         char **addrp, **naddrp;
1397         struct hostent t_host;
1398         int i;
1399         u_int32_t saddr;
1400         char *aptr[2];
1401
1402         if (grp->gr_type != GT_NULL)
1403                 return (1);
1404         if ((hp = gethostbyname(cp)) == NULL) {
1405                 if (isdigit(*cp)) {
1406                         saddr = inet_addr(cp);
1407                         if (saddr == -1) {
1408                                 syslog(LOG_ERR, "inet_addr failed for %s", cp);
1409                                 return (1);
1410                         }
1411                         if ((hp = gethostbyaddr((caddr_t)&saddr, sizeof (saddr),
1412                                 AF_INET)) == NULL) {
1413                                 hp = &t_host;
1414                                 hp->h_name = cp;
1415                                 hp->h_addrtype = AF_INET;
1416                                 hp->h_length = sizeof (u_int32_t);
1417                                 hp->h_addr_list = aptr;
1418                                 aptr[0] = (char *)&saddr;
1419                                 aptr[1] = (char *)NULL;
1420                         }
1421                 } else {
1422                         syslog(LOG_ERR, "gethostbyname failed for %s", cp);
1423                         return (1);
1424                 }
1425         }
1426         /*
1427          * Sanity check: make sure we don't already have an entry
1428          * for this host in the grouplist.
1429          */
1430         checkgrp = tgrp;
1431         while (checkgrp != NULL) {
1432                 if (checkgrp->gr_type == GT_HOST &&
1433                     checkgrp->gr_ptr.gt_hostent != NULL &&
1434                     (!strcmp(checkgrp->gr_ptr.gt_hostent->h_name, hp->h_name)
1435                 || *(u_int32_t *)checkgrp->gr_ptr.gt_hostent->h_addr ==
1436                         *(u_int32_t *)hp->h_addr)) {
1437                         grp->gr_type = GT_IGNORE;
1438                         return(0);
1439                 }
1440                 checkgrp = checkgrp->gr_next;
1441         }
1442
1443         grp->gr_type = GT_HOST;
1444         nhp = grp->gr_ptr.gt_hostent = (struct hostent *)
1445                 malloc(sizeof(struct hostent));
1446         if (nhp == (struct hostent *)NULL)
1447                 out_of_mem();
1448         memmove(nhp, hp, sizeof(struct hostent));
1449         i = strlen(hp->h_name)+1;
1450         nhp->h_name = (char *)malloc(i);
1451         if (nhp->h_name == (char *)NULL)
1452                 out_of_mem();
1453         memmove(nhp->h_name, hp->h_name, i);
1454         addrp = hp->h_addr_list;
1455         i = 1;
1456         while (*addrp++)
1457                 i++;
1458         naddrp = nhp->h_addr_list = (char **)malloc(i*sizeof(char *));
1459         if (naddrp == (char **)NULL)
1460                 out_of_mem();
1461         addrp = hp->h_addr_list;
1462         while (*addrp) {
1463                 *naddrp = (char *)malloc(hp->h_length);
1464                 if (*naddrp == (char *)NULL)
1465                     out_of_mem();
1466                 memmove(*naddrp, *addrp, hp->h_length);
1467                 addrp++;
1468                 naddrp++;
1469         }
1470         *naddrp = (char *)NULL;
1471         if (debug)
1472                 warnx("got host %s", hp->h_name);
1473         return (0);
1474 }
1475
1476 /*
1477  * Free up an exports list component
1478  */
1479 void
1480 free_exp(struct exportlist *ep)
1481 {
1482
1483         if (ep->ex_defdir) {
1484                 free_host(ep->ex_defdir->dp_hosts);
1485                 free((caddr_t)ep->ex_defdir);
1486         }
1487         if (ep->ex_fsdir)
1488                 free(ep->ex_fsdir);
1489         if (ep->ex_indexfile)
1490                 free(ep->ex_indexfile);
1491         free_dir(ep->ex_dirl);
1492         free((caddr_t)ep);
1493 }
1494
1495 /*
1496  * Free hosts.
1497  */
1498 void
1499 free_host(struct hostlist *hp)
1500 {
1501         struct hostlist *hp2;
1502
1503         while (hp) {
1504                 hp2 = hp;
1505                 hp = hp->ht_next;
1506                 free((caddr_t)hp2);
1507         }
1508 }
1509
1510 struct hostlist *
1511 get_ht(void)
1512 {
1513         struct hostlist *hp;
1514
1515         hp = (struct hostlist *)malloc(sizeof (struct hostlist));
1516         if (hp == (struct hostlist *)NULL)
1517                 out_of_mem();
1518         hp->ht_next = (struct hostlist *)NULL;
1519         hp->ht_flag = 0;
1520         return (hp);
1521 }
1522
1523 /*
1524  * Out of memory, fatal
1525  */
1526 void
1527 out_of_mem(void)
1528 {
1529
1530         syslog(LOG_ERR, "out of memory");
1531         exit(2);
1532 }
1533
1534 /*
1535  * Do the mount syscall with the update flag to push the export info into
1536  * the kernel.
1537  */
1538 int
1539 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags,
1540          struct ucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb)
1541 {
1542         struct statfs fsb1;
1543         char *cp = NULL;
1544         u_int32_t **addrp;
1545         int done;
1546         char savedc = '\0';
1547         struct sockaddr_in sin, imask;
1548         union {
1549                 struct ufs_args ua;
1550                 struct iso_args ia;
1551                 struct mfs_args ma;
1552 #ifdef __NetBSD__
1553                 struct msdosfs_args da;
1554 #endif
1555                 struct ntfs_args na;
1556         } args;
1557         u_int32_t net;
1558
1559         args.ua.fspec = 0;
1560         args.ua.export.ex_flags = exflags;
1561         args.ua.export.ex_anon = *anoncrp;
1562         args.ua.export.ex_indexfile = ep->ex_indexfile;
1563         memset(&sin, 0, sizeof(sin));
1564         memset(&imask, 0, sizeof(imask));
1565         sin.sin_family = AF_INET;
1566         sin.sin_len = sizeof(sin);
1567         imask.sin_family = AF_INET;
1568         imask.sin_len = sizeof(sin);
1569         if (grp->gr_type == GT_HOST)
1570                 addrp = (u_int32_t **)grp->gr_ptr.gt_hostent->h_addr_list;
1571         else
1572                 addrp = (u_int32_t **)NULL;
1573         done = FALSE;
1574         while (!done) {
1575                 switch (grp->gr_type) {
1576                 case GT_HOST:
1577                         if (addrp) {
1578                                 sin.sin_addr.s_addr = **addrp;
1579                                 args.ua.export.ex_addrlen = sizeof(sin);
1580                         } else
1581                                 args.ua.export.ex_addrlen = 0;
1582                         args.ua.export.ex_addr = (struct sockaddr *)&sin;
1583                         args.ua.export.ex_masklen = 0;
1584                         break;
1585                 case GT_NET:
1586                         if (grp->gr_ptr.gt_net.nt_mask)
1587                             imask.sin_addr.s_addr = grp->gr_ptr.gt_net.nt_mask;
1588                         else {
1589                             net = ntohl(grp->gr_ptr.gt_net.nt_net);
1590                             if (IN_CLASSA(net))
1591                                 imask.sin_addr.s_addr = inet_addr("255.0.0.0");
1592                             else if (IN_CLASSB(net))
1593                                 imask.sin_addr.s_addr =
1594                                     inet_addr("255.255.0.0");
1595                             else
1596                                 imask.sin_addr.s_addr =
1597                                     inet_addr("255.255.255.0");
1598                             grp->gr_ptr.gt_net.nt_mask = imask.sin_addr.s_addr;
1599                         }
1600                         sin.sin_addr.s_addr = grp->gr_ptr.gt_net.nt_net;
1601                         args.ua.export.ex_addr = (struct sockaddr *)&sin;
1602                         args.ua.export.ex_addrlen = sizeof (sin);
1603                         args.ua.export.ex_mask = (struct sockaddr *)&imask;
1604                         args.ua.export.ex_masklen = sizeof (imask);
1605                         break;
1606                 case GT_IGNORE:
1607                         return(0);
1608                         break;
1609                 default:
1610                         syslog(LOG_ERR, "bad grouptype");
1611                         if (cp)
1612                                 *cp = savedc;
1613                         return (1);
1614                 };
1615
1616                 /*
1617                  * XXX:
1618                  * Maybe I should just use the fsb->f_mntonname path instead
1619                  * of looping back up the dirp to the mount point??
1620                  * Also, needs to know how to export all types of local
1621                  * exportable file systems and not just "ufs".
1622                  */
1623                 for (;;) {
1624                         int r;
1625
1626                         r = mountctl(fsb->f_mntonname, MOUNTCTL_SET_EXPORT,
1627                                      -1,
1628                                      &args.ua.export, sizeof(args.ua.export),
1629                                      NULL, 0);
1630                         if (r < 0 && errno == EOPNOTSUPP) {
1631                                 r = mount(fsb->f_fstypename, dirp,
1632                                           fsb->f_flags | MNT_UPDATE,
1633                                           (caddr_t)&args);
1634                         }
1635                         if (r >= 0)
1636                                 break;
1637                         if (cp)
1638                                 *cp-- = savedc;
1639                         else
1640                                 cp = dirp + dirplen - 1;
1641                         if (opt_flags & OP_QUIET)
1642                                 return (1);
1643                         if (errno == EPERM) {
1644                                 syslog(LOG_ERR,
1645                                    "can't change attributes for %s", dirp);
1646                                 return (1);
1647                         }
1648                         if (opt_flags & OP_ALLDIRS) {
1649                                 if (errno == EINVAL)
1650                                         syslog(LOG_ERR,
1651                 "-alldirs requested but %s is not a filesystem mountpoint",
1652                                                 dirp);
1653                                 else
1654                                         syslog(LOG_ERR,
1655                                                 "could not remount %s: %m",
1656                                                 dirp);
1657                                 return (1);
1658                         }
1659                         /* back up over the last component */
1660                         while (*cp == '/' && cp > dirp)
1661                                 cp--;
1662                         while (*(cp - 1) != '/' && cp > dirp)
1663                                 cp--;
1664                         if (cp == dirp) {
1665                                 if (debug)
1666                                         warnx("mnt unsucc");
1667                                 syslog(LOG_ERR, "can't export %s", dirp);
1668                                 return (1);
1669                         }
1670                         savedc = *cp;
1671                         *cp = '\0';
1672                         /* Check that we're still on the same filesystem. */
1673                         if (statfs(dirp, &fsb1) != 0 || bcmp(&fsb1.f_fsid,
1674                             &fsb->f_fsid, sizeof(fsb1.f_fsid)) != 0) {
1675                                 *cp = savedc;
1676                                 syslog(LOG_ERR, "can't export %s", dirp);
1677                                 return (1);
1678                         }
1679                 }
1680                 if (addrp) {
1681                         ++addrp;
1682                         if (*addrp == (u_int32_t *)NULL)
1683                                 done = TRUE;
1684                 } else
1685                         done = TRUE;
1686         }
1687         if (cp)
1688                 *cp = savedc;
1689         return (0);
1690 }
1691
1692 /*
1693  * Translate a net address.
1694  */
1695 int
1696 get_net(char *cp, struct netmsk *net, int maskflg)
1697 {
1698         struct netent *np;
1699         long netaddr;
1700         struct in_addr inetaddr, inetaddr2;
1701         char *name;
1702
1703         if (isdigit(*cp) && ((netaddr = inet_network(cp)) != -1)) {
1704                 inetaddr = inet_makeaddr(netaddr, 0);
1705                 /*
1706                  * Due to arbitrary subnet masks, you don't know how many
1707                  * bits to shift the address to make it into a network,
1708                  * however you do know how to make a network address into
1709                  * a host with host == 0 and then compare them.
1710                  * (What a pest)
1711                  */
1712                 if (!maskflg) {
1713                         setnetent(0);
1714                         while ((np = getnetent())) {
1715                                 inetaddr2 = inet_makeaddr(np->n_net, 0);
1716                                 if (inetaddr2.s_addr == inetaddr.s_addr)
1717                                         break;
1718                         }
1719                         endnetent();
1720                 }
1721         } else if ((np = getnetbyname(cp)) != NULL) {
1722                 inetaddr = inet_makeaddr(np->n_net, 0);
1723         } else
1724                 return (1);
1725
1726         if (maskflg)
1727                 net->nt_mask = inetaddr.s_addr;
1728         else {
1729                 if (np)
1730                         name = np->n_name;
1731                 else
1732                         name = inet_ntoa(inetaddr);
1733                 net->nt_name = (char *)malloc(strlen(name) + 1);
1734                 if (net->nt_name == (char *)NULL)
1735                         out_of_mem();
1736                 strcpy(net->nt_name, name);
1737                 net->nt_net = inetaddr.s_addr;
1738         }
1739         return (0);
1740 }
1741
1742 /*
1743  * Parse out the next white space separated field
1744  */
1745 void
1746 nextfield(char **cp, char **endcp)
1747 {
1748         char *p;
1749
1750         p = *cp;
1751         while (*p == ' ' || *p == '\t')
1752                 p++;
1753         if (*p == '\n' || *p == '\0')
1754                 *cp = *endcp = p;
1755         else {
1756                 *cp = p++;
1757                 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
1758                         p++;
1759                 *endcp = p;
1760         }
1761 }
1762
1763 /*
1764  * Get an exports file line. Skip over blank lines and handle line
1765  * continuations.
1766  */
1767 int
1768 get_line(void)
1769 {
1770         char *p, *cp;
1771         int len;
1772         int totlen, cont_line;
1773
1774         /*
1775          * Loop around ignoring blank lines and getting all continuation lines.
1776          */
1777         p = line;
1778         totlen = 0;
1779         do {
1780                 if (fgets(p, LINESIZ - totlen, exp_file) == NULL)
1781                         return (0);
1782                 len = strlen(p);
1783                 cp = p + len - 1;
1784                 cont_line = 0;
1785                 while (cp >= p &&
1786                     (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) {
1787                         if (*cp == '\\')
1788                                 cont_line = 1;
1789                         cp--;
1790                         len--;
1791                 }
1792                 if (cont_line) {
1793                         *++cp = ' ';
1794                         len++;
1795                 }
1796                 *++cp = '\0';
1797                 if (len > 0) {
1798                         totlen += len;
1799                         if (totlen >= LINESIZ) {
1800                                 syslog(LOG_ERR, "exports line too long");
1801                                 exit(2);
1802                         }
1803                         p = cp;
1804                 }
1805         } while (totlen == 0 || cont_line);
1806         return (1);
1807 }
1808
1809 /*
1810  * Parse a description of a credential.
1811  */
1812 void
1813 parsecred(char *namelist, struct ucred *cr)
1814 {
1815         char *name;
1816         int cnt;
1817         char *names;
1818         struct passwd *pw;
1819         struct group *gr;
1820         int ngroups, groups[NGROUPS + 1];
1821
1822         /*
1823          * Set up the unprivileged user.
1824          */
1825         cr->cr_ref = 1;
1826         cr->cr_uid = -2;
1827         cr->cr_groups[0] = -2;
1828         cr->cr_ngroups = 1;
1829         /*
1830          * Get the user's password table entry.
1831          */
1832         names = strsep(&namelist, " \t\n");
1833         name = strsep(&names, ":");
1834         if (isdigit(*name) || *name == '-')
1835                 pw = getpwuid(atoi(name));
1836         else
1837                 pw = getpwnam(name);
1838         /*
1839          * Credentials specified as those of a user.
1840          */
1841         if (names == NULL) {
1842                 if (pw == NULL) {
1843                         syslog(LOG_ERR, "unknown user: %s", name);
1844                         return;
1845                 }
1846                 cr->cr_uid = pw->pw_uid;
1847                 ngroups = NGROUPS + 1;
1848                 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups))
1849                         syslog(LOG_ERR, "too many groups");
1850                 /*
1851                  * Convert from int's to gid_t's and compress out duplicate
1852                  */
1853                 cr->cr_ngroups = ngroups - 1;
1854                 cr->cr_groups[0] = groups[0];
1855                 for (cnt = 2; cnt < ngroups; cnt++)
1856                         cr->cr_groups[cnt - 1] = groups[cnt];
1857                 return;
1858         }
1859         /*
1860          * Explicit credential specified as a colon separated list:
1861          *      uid:gid:gid:...
1862          */
1863         if (pw != NULL)
1864                 cr->cr_uid = pw->pw_uid;
1865         else if (isdigit(*name) || *name == '-')
1866                 cr->cr_uid = atoi(name);
1867         else {
1868                 syslog(LOG_ERR, "unknown user: %s", name);
1869                 return;
1870         }
1871         cr->cr_ngroups = 0;
1872         while (names != NULL && *names != '\0' && cr->cr_ngroups < NGROUPS) {
1873                 name = strsep(&names, ":");
1874                 if (isdigit(*name) || *name == '-') {
1875                         cr->cr_groups[cr->cr_ngroups++] = atoi(name);
1876                 } else {
1877                         if ((gr = getgrnam(name)) == NULL) {
1878                                 syslog(LOG_ERR, "unknown group: %s", name);
1879                                 continue;
1880                         }
1881                         cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid;
1882                 }
1883         }
1884         if (names != NULL && *names != '\0' && cr->cr_ngroups == NGROUPS)
1885                 syslog(LOG_ERR, "too many groups");
1886 }
1887
1888 #define STRSIZ  (RPCMNT_NAMELEN+RPCMNT_PATHLEN+50)
1889 /*
1890  * Routines that maintain the remote mounttab
1891  */
1892 void
1893 get_mountlist(void)
1894 {
1895         struct mountlist *mlp, **mlpp;
1896         char *host, *dirp, *cp;
1897         char str[STRSIZ];
1898         FILE *mlfile;
1899
1900         if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) {
1901                 if (errno == ENOENT)
1902                         return;
1903                 else {
1904                         syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST);
1905                         return;
1906                 }
1907         }
1908         mlpp = &mlhead;
1909         while (fgets(str, STRSIZ, mlfile) != NULL) {
1910                 cp = str;
1911                 host = strsep(&cp, " \t\n");
1912                 dirp = strsep(&cp, " \t\n");
1913                 if (host == NULL || dirp == NULL)
1914                         continue;
1915                 mlp = (struct mountlist *)malloc(sizeof (*mlp));
1916                 if (mlp == (struct mountlist *)NULL)
1917                         out_of_mem();
1918                 strncpy(mlp->ml_host, host, RPCMNT_NAMELEN);
1919                 mlp->ml_host[RPCMNT_NAMELEN] = '\0';
1920                 strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN);
1921                 mlp->ml_dirp[RPCMNT_PATHLEN] = '\0';
1922                 mlp->ml_next = (struct mountlist *)NULL;
1923                 *mlpp = mlp;
1924                 mlpp = &mlp->ml_next;
1925         }
1926         fclose(mlfile);
1927 }
1928
1929 void
1930 del_mlist(char *hostp, char *dirp)
1931 {
1932         struct mountlist *mlp, **mlpp;
1933         struct mountlist *mlp2;
1934         FILE *mlfile;
1935         int fnd = 0;
1936
1937         mlpp = &mlhead;
1938         mlp = mlhead;
1939         while (mlp) {
1940                 if (!strcmp(mlp->ml_host, hostp) &&
1941                     (!dirp || !strcmp(mlp->ml_dirp, dirp))) {
1942                         fnd = 1;
1943                         mlp2 = mlp;
1944                         *mlpp = mlp = mlp->ml_next;
1945                         free((caddr_t)mlp2);
1946                 } else {
1947                         mlpp = &mlp->ml_next;
1948                         mlp = mlp->ml_next;
1949                 }
1950         }
1951         if (fnd) {
1952                 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) {
1953                         syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST);
1954                         return;
1955                 }
1956                 mlp = mlhead;
1957                 while (mlp) {
1958                         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
1959                         mlp = mlp->ml_next;
1960                 }
1961                 fclose(mlfile);
1962         }
1963 }
1964
1965 void
1966 add_mlist(char *hostp, char *dirp)
1967 {
1968         struct mountlist *mlp, **mlpp;
1969         FILE *mlfile;
1970
1971         mlpp = &mlhead;
1972         mlp = mlhead;
1973         while (mlp) {
1974                 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp))
1975                         return;
1976                 mlpp = &mlp->ml_next;
1977                 mlp = mlp->ml_next;
1978         }
1979         mlp = (struct mountlist *)malloc(sizeof (*mlp));
1980         if (mlp == (struct mountlist *)NULL)
1981                 out_of_mem();
1982         strncpy(mlp->ml_host, hostp, RPCMNT_NAMELEN);
1983         mlp->ml_host[RPCMNT_NAMELEN] = '\0';
1984         strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN);
1985         mlp->ml_dirp[RPCMNT_PATHLEN] = '\0';
1986         mlp->ml_next = (struct mountlist *)NULL;
1987         *mlpp = mlp;
1988         if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
1989                 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST);
1990                 return;
1991         }
1992         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
1993         fclose(mlfile);
1994 }
1995
1996 /*
1997  * Free up a group list.
1998  */
1999 void
2000 free_grp(struct grouplist *grp)
2001 {
2002         char **addrp;
2003
2004         if (grp->gr_type == GT_HOST) {
2005                 if (grp->gr_ptr.gt_hostent->h_name) {
2006                         addrp = grp->gr_ptr.gt_hostent->h_addr_list;
2007                         while (addrp && *addrp)
2008                                 free(*addrp++);
2009                         free((caddr_t)grp->gr_ptr.gt_hostent->h_addr_list);
2010                         free(grp->gr_ptr.gt_hostent->h_name);
2011                 }
2012                 free((caddr_t)grp->gr_ptr.gt_hostent);
2013         } else if (grp->gr_type == GT_NET) {
2014                 if (grp->gr_ptr.gt_net.nt_name)
2015                         free(grp->gr_ptr.gt_net.nt_name);
2016         }
2017         free((caddr_t)grp);
2018 }
2019
2020 #ifdef DEBUG
2021 void
2022 SYSLOG(int pri, const char *fmt, ...)
2023 {
2024         va_list ap;
2025
2026         va_start(ap, fmt);
2027         vfprintf(stderr, fmt, ap);
2028         va_end(ap);
2029 }
2030 #endif /* DEBUG */
2031
2032 /*
2033  * Check options for consistency.
2034  */
2035 int
2036 check_options(struct dirlist *dp)
2037 {
2038
2039         if (dp == (struct dirlist *)NULL)
2040             return (1);
2041         if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL) ||
2042             (opt_flags & (OP_MAPROOT | OP_KERB)) == (OP_MAPROOT | OP_KERB) ||
2043             (opt_flags & (OP_MAPALL | OP_KERB)) == (OP_MAPALL | OP_KERB)) {
2044             syslog(LOG_ERR, "-mapall, -maproot and -kerb mutually exclusive");
2045             return (1);
2046         }
2047         if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) {
2048                 syslog(LOG_ERR, "-mask requires -network");
2049                 return (1);
2050         }
2051         if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
2052             syslog(LOG_ERR, "-alldirs has multiple directories");
2053             return (1);
2054         }
2055         return (0);
2056 }
2057
2058 /*
2059  * Check an absolute directory path for any symbolic links. Return true
2060  * if no symbolic links are found.
2061  */
2062 int
2063 check_dirpath(char *dirp)
2064 {
2065         char *cp;
2066         int ret = 1;
2067         struct stat sb;
2068
2069         cp = dirp + 1;
2070         while (*cp && ret) {
2071                 if (*cp == '/') {
2072                         *cp = '\0';
2073                         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
2074                                 ret = 0;
2075                         *cp = '/';
2076                 }
2077                 cp++;
2078         }
2079         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
2080                 ret = 0;
2081         return (ret);
2082 }
2083
2084 /*
2085  * Just translate an ascii string to an integer.
2086  */
2087 int
2088 get_num(char *cp)
2089 {
2090         int res = 0;
2091
2092         while (*cp) {
2093                 if (*cp < '0' || *cp > '9')
2094                         return (-1);
2095                 res = res * 10 + (*cp++ - '0');
2096         }
2097         return (res);
2098 }