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 1.8 2005/11/06 12:43:47 swildner Exp $
  40  */
  41
  42 #include <sys/param.h>
  43 #include <sys/mount.h>
  44 #include <sys/stat.h>
  45 #include <sys/syslog.h>
  46 #include <sys/sysctl.h>
  47
  48 #include <rpc/rpc.h>
  49 #include <rpc/pmap_clnt.h>
  50 #include <vfs/nfs/rpcv2.h>
  51 #include <vfs/nfs/nfsproto.h>
  52 #include <vfs/nfs/nfs.h>
  53 #include <vfs/ufs/ufsmount.h>
  54 #include <vfs/msdosfs/msdosfsmount.h>
  55 #include <vfs/ntfs/ntfsmount.h>
  56 #include <vfs/isofs/cd9660/cd9660_mount.h>      /* XXX need isofs in include */
  57
  58 #include <arpa/inet.h>
  59
  60 #include <ctype.h>
  61 #include <err.h>
  62 #include <errno.h>
  63 #include <grp.h>
  64 #include <netdb.h>
  65 #include <pwd.h>
  66 #include <signal.h>
  67 #include <stdio.h>
  68 #include <stdlib.h>
  69 #include <string.h>
  70 #include <unistd.h>
  71 #include "pathnames.h"
  72
  73 #ifdef DEBUG
  74 #include <stdarg.h>
  75 #endif
  76
  77 /*
  78  * Structures for keeping the mount list and export list
  79  */
  80 struct mountlist {
  81         struct mountlist *ml_next;
  82         char    ml_host[RPCMNT_NAMELEN+1];
  83         char    ml_dirp[RPCMNT_PATHLEN+1];
  84 };
  85
  86 struct dirlist {
  87         struct dirlist  *dp_left;
  88         struct dirlist  *dp_right;
  89         int             dp_flag;
  90         struct hostlist *dp_hosts;      /* List of hosts this dir exported to */
  91         char            dp_dirp[1];     /* Actually malloc'd to size of dir */
  92 };
  93 /* dp_flag bits */
  94 #define DP_DEFSET       0x1
  95 #define DP_HOSTSET      0x2
  96 #define DP_KERB         0x4
  97
  98 struct exportlist {
  99         struct exportlist *ex_next;
 100         struct dirlist  *ex_dirl;
 101         struct dirlist  *ex_defdir;
 102         int             ex_flag;
 103         fsid_t          ex_fs;
 104         char            *ex_fsdir;
 105         char            *ex_indexfile;
 106 };
 107 /* ex_flag bits */
 108 #define EX_LINKED       0x1
 109
 110 struct netmsk {
 111         u_int32_t       nt_net;
 112         u_int32_t       nt_mask;
 113         char            *nt_name;
 114 };
 115
 116 union grouptypes {
 117         struct hostent *gt_hostent;
 118         struct netmsk   gt_net;
 119 };
 120
 121 struct grouplist {
 122         int gr_type;
 123         union grouptypes gr_ptr;
 124         struct grouplist *gr_next;
 125 };
 126 /* Group types */
 127 #define GT_NULL         0x0
 128 #define GT_HOST         0x1
 129 #define GT_NET          0x2
 130 #define GT_IGNORE       0x5
 131
 132 struct hostlist {
 133         int              ht_flag;       /* Uses DP_xx bits */
 134         struct grouplist *ht_grp;
 135         struct hostlist  *ht_next;
 136 };
 137
 138 struct fhreturn {
 139         int     fhr_flag;
 140         int     fhr_vers;
 141         nfsfh_t fhr_fh;
 142 };
 143
 144 /* Global defs */
 145 char    *add_expdir(struct dirlist **, char *, int);
 146 void    add_dlist(struct dirlist **, struct dirlist *,
 147                                 struct grouplist *, int);
 148 void    add_mlist(char *, char *);
 149 int     check_dirpath(char *);
 150 int     check_options(struct dirlist *);
 151 int     chk_host(struct dirlist *, u_int32_t, int *, int *);
 152 void    del_mlist(char *, char *);
 153 struct dirlist *dirp_search(struct dirlist *, char *);
 154 int     do_mount(struct exportlist *, struct grouplist *, int,
 155                 struct ucred *, char *, int, struct statfs *);
 156 int     do_opt(char **, char **, struct exportlist *, struct grouplist *,
 157                                 int *, int *, struct ucred *);
 158 struct  exportlist *ex_search(fsid_t *);
 159 struct  exportlist *get_exp(void);
 160 void    free_dir(struct dirlist *);
 161 void    free_exp(struct exportlist *);
 162 void    free_grp(struct grouplist *);
 163 void    free_host(struct hostlist *);
 164 void    get_exportlist(void);
 165 int     get_host(char *, struct grouplist *, struct grouplist *);
 166 int     get_num(char *);
 167 struct hostlist *get_ht(void);
 168 int     get_line(void);
 169 void    get_mountlist(void);
 170 int     get_net(char *, struct netmsk *, int);
 171 void    getexp_err(struct exportlist *, struct grouplist *);
 172 struct grouplist *get_grp(void);
 173 void    hang_dirp(struct dirlist *, struct grouplist *,
 174                                 struct exportlist *, int);
 175 void    mntsrv(struct svc_req *, SVCXPRT *);
 176 void    nextfield(char **, char **);
 177 void    out_of_mem(void);
 178 void    parsecred(char *, struct ucred *);
 179 int     put_exlist(struct dirlist *, XDR *, struct dirlist *, int *);
 180 int     scan_tree(struct dirlist *, u_int32_t);
 181 static void usage(void);
 182 int     xdr_dir(XDR *, char *);
 183 int     xdr_explist(XDR *, caddr_t);
 184 int     xdr_fhs(XDR *, caddr_t);
 185 int     xdr_mlist(XDR *, caddr_t);
 186
 187 struct exportlist *exphead;
 188 struct mountlist *mlhead;
 189 struct grouplist *grphead;
 190 char exname[MAXPATHLEN];
 191 struct ucred def_anon = {
 192         1,
 193         (uid_t) -2,
 194         1,
 195         { (gid_t) -2 }
 196 };
 197 int force_v2 = 0;
 198 int resvport_only = 1;
 199 int dir_only = 1;
 200 int do_log = 0;
 201 int opt_flags;
 202 /* Bits for above */
 203 #define OP_MAPROOT      0x01
 204 #define OP_MAPALL       0x02
 205 #define OP_KERB         0x04
 206 #define OP_MASK         0x08
 207 #define OP_NET          0x10
 208 #define OP_ALLDIRS      0x40
 209 /* 0x80 is OP_HAVEMASK in FreeBSD 5+ */
 210 #define OP_QUIET        0x100
 211
 212 #ifdef DEBUG
 213 int debug = 1;
 214 void    SYSLOG(int, const char *, ...);
 215 #define syslog SYSLOG
 216 #else
 217 int debug = 0;
 218 #endif
 219
 220 /*
 221  * Mountd server for NFS mount protocol as described in:
 222  * NFS: Network File System Protocol Specification, RFC1094, Appendix A
 223  * The optional arguments are the exports file name
 224  * default: _PATH_EXPORTS
 225  * and "-n" to allow nonroot mount.
 226  */
 227 int
 228 main(int argc, char **argv)
 229 {
 230         SVCXPRT *udptransp, *tcptransp;
 231         int c, error, mib[3];
 232         struct vfsconf vfc;
 233
 234         error = getvfsbyname("nfs", &vfc);
 235         if (error && vfsisloadable("nfs")) {
 236                 if(vfsload("nfs"))
 237                         err(1, "vfsload(nfs)");
 238                 endvfsent();    /* flush cache */
 239                 error = getvfsbyname("nfs", &vfc);
 240         }
 241         if (error)
 242                 errx(1, "NFS support is not available in the running kernel");
 243
 244         while ((c = getopt(argc, argv, "2dlnr")) != -1)
 245                 switch (c) {
 246                 case '2':
 247                         force_v2 = 1;
 248                         break;
 249                 case 'n':
 250                         resvport_only = 0;
 251                         break;
 252                 case 'r':
 253                         dir_only = 0;
 254                         break;
 255                 case 'd':
 256                         debug = debug ? 0 : 1;
 257                         break;
 258                 case 'l':
 259                         do_log = 1;
 260                         break;
 261                 default:
 262                         usage();
 263                 };
 264         argc -= optind;
 265         argv += optind;
 266         grphead = (struct grouplist *)NULL;
 267         exphead = (struct exportlist *)NULL;
 268         mlhead = (struct mountlist *)NULL;
 269         if (argc == 1) {
 270                 strncpy(exname, *argv, MAXPATHLEN-1);
 271                 exname[MAXPATHLEN-1] = '\0';
 272         } else
 273                 strcpy(exname, _PATH_EXPORTS);
 274         openlog("mountd", LOG_PID, LOG_DAEMON);
 275         if (debug)
 276                 warnx("getting export list");
 277         get_exportlist();
 278         if (debug)
 279                 warnx("getting mount list");
 280         get_mountlist();
 281         if (debug)
 282                 warnx("here we go");
 283         if (debug == 0) {
 284                 daemon(0, 0);
 285                 signal(SIGINT, SIG_IGN);
 286                 signal(SIGQUIT, SIG_IGN);
 287         }
 288         signal(SIGHUP, (void (*)(int)) get_exportlist);
 289         { FILE *pidfile = fopen(_PATH_MOUNTDPID, "w");
 290           if (pidfile != NULL) {
 291                 fprintf(pidfile, "%d\n", getpid());
 292                 fclose(pidfile);
 293           }
 294         }
 295         if (!resvport_only) {
 296                 mib[0] = CTL_VFS;
 297                 mib[1] = vfc.vfc_typenum;
 298                 mib[2] = NFS_NFSPRIVPORT;
 299                 if (sysctl(mib, 3, NULL, NULL, &resvport_only,
 300                     sizeof(resvport_only)) != 0 && errno != ENOENT) {
 301                         syslog(LOG_ERR, "sysctl: %m");
 302                         exit(1);
 303                 }
 304         }
 305         if ((udptransp = svcudp_create(RPC_ANYSOCK)) == NULL ||
 306             (tcptransp = svctcp_create(RPC_ANYSOCK, 0, 0)) == NULL) {
 307                 syslog(LOG_ERR, "can't create socket");
 308                 exit(1);
 309         }
 310         pmap_unset(RPCPROG_MNT, 1);
 311         pmap_unset(RPCPROG_MNT, 3);
 312         if (!force_v2)
 313                 if (!svc_register(udptransp, RPCPROG_MNT, 3, mntsrv, IPPROTO_UDP) ||
 314                     !svc_register(tcptransp, RPCPROG_MNT, 3, mntsrv, IPPROTO_TCP)) {
 315                         syslog(LOG_ERR, "can't register mount");
 316                         exit(1);
 317                 }
 318         if (!svc_register(udptransp, RPCPROG_MNT, 1, mntsrv, IPPROTO_UDP) ||
 319             !svc_register(tcptransp, RPCPROG_MNT, 1, mntsrv, IPPROTO_TCP)) {
 320                 syslog(LOG_ERR, "can't register mount");
 321                 exit(1);
 322         }
 323         svc_run();
 324         syslog(LOG_ERR, "mountd died");
 325         exit(1);
 326 }
 327
 328 static void
 329 usage(void)
 330 {
 331         fprintf(stderr,
 332                 "usage: mountd [-2] [-d] [-l] [-n] [-r] [export_file]\n");
 333         exit(1);
 334 }
 335
 336 /*
 337  * The mount rpc service
 338  */
 339 void
 340 mntsrv(struct svc_req *rqstp, SVCXPRT *transp)
 341 {
 342         struct exportlist *ep;
 343         struct dirlist *dp;
 344         struct fhreturn fhr;
 345         struct stat stb;
 346         struct statfs fsb;
 347         struct hostent *hp;
 348         struct in_addr saddrin;
 349         u_int32_t saddr;
 350         u_short sport;
 351         char rpcpath[RPCMNT_PATHLEN + 1], dirpath[MAXPATHLEN];
 352         int bad = 0, defset, hostset;
 353         sigset_t sighup_mask;
 354
 355         sigemptyset(&sighup_mask);
 356         sigaddset(&sighup_mask, SIGHUP);
 357         saddr = transp->xp_raddr.sin_addr.s_addr;
 358         saddrin = transp->xp_raddr.sin_addr;
 359         sport = ntohs(transp->xp_raddr.sin_port);
 360         hp = (struct hostent *)NULL;
 361         switch (rqstp->rq_proc) {
 362         case NULLPROC:
 363                 if (!svc_sendreply(transp, xdr_void, (caddr_t)NULL))
 364                         syslog(LOG_ERR, "can't send reply");
 365                 return;
 366         case RPCMNT_MOUNT:
 367                 if (sport >= IPPORT_RESERVED && resvport_only) {
 368                         syslog(LOG_NOTICE,
 369                             "mount request from %s from unprivileged port",
 370                             inet_ntoa(saddrin));
 371                         svcerr_weakauth(transp);
 372                         return;
 373                 }
 374                 if (!svc_getargs(transp, xdr_dir, rpcpath)) {
 375                         syslog(LOG_NOTICE, "undecodable mount request from %s",
 376                             inet_ntoa(saddrin));
 377                         svcerr_decode(transp);
 378                         return;
 379                 }
 380
 381                 /*
 382                  * Get the real pathname and make sure it is a directory
 383                  * or a regular file if the -r option was specified
 384                  * and it exists.
 385                  */
 386                 if (realpath(rpcpath, dirpath) == NULL ||
 387                     stat(dirpath, &stb) < 0 ||
 388                     (!S_ISDIR(stb.st_mode) &&
 389                      (dir_only || !S_ISREG(stb.st_mode))) ||
 390                     statfs(dirpath, &fsb) < 0) {
 391                         chdir("/");     /* Just in case realpath doesn't */
 392                         syslog(LOG_NOTICE,
 393                             "mount request from %s for non existent path %s",
 394                             inet_ntoa(saddrin), dirpath);
 395                         if (debug)
 396                                 warnx("stat failed on %s", dirpath);
 397                         bad = ENOENT;   /* We will send error reply later */
 398                 }
 399
 400                 /* Check in the exports list */
 401                 sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
 402                 ep = ex_search(&fsb.f_fsid);
 403                 hostset = defset = 0;
 404                 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset) ||
 405                     ((dp = dirp_search(ep->ex_dirl, dirpath)) &&
 406                      chk_host(dp, saddr, &defset, &hostset)) ||
 407                      (defset && scan_tree(ep->ex_defdir, saddr) == 0 &&
 408                       scan_tree(ep->ex_dirl, saddr) == 0))) {
 409                         if (bad) {
 410                                 if (!svc_sendreply(transp, xdr_long,
 411                                     (caddr_t)&bad))
 412                                         syslog(LOG_ERR, "can't send reply");
 413                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 414                                 return;
 415                         }
 416                         if (hostset & DP_HOSTSET)
 417                                 fhr.fhr_flag = hostset;
 418                         else
 419                                 fhr.fhr_flag = defset;
 420                         fhr.fhr_vers = rqstp->rq_vers;
 421                         /* Get the file handle */
 422                         memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t));
 423                         if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) {
 424                                 bad = errno;
 425                                 syslog(LOG_ERR, "can't get fh for %s", dirpath);
 426                                 if (!svc_sendreply(transp, xdr_long,
 427                                     (caddr_t)&bad))
 428                                         syslog(LOG_ERR, "can't send reply");
 429                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 430                                 return;
 431                         }
 432                         if (!svc_sendreply(transp, xdr_fhs, (caddr_t)&fhr))
 433                                 syslog(LOG_ERR, "can't send reply");
 434                         if (hp == NULL)
 435                                 hp = gethostbyaddr((caddr_t)&saddr,
 436                                     sizeof(saddr), AF_INET);
 437                         if (hp)
 438                                 add_mlist(hp->h_name, dirpath);
 439                         else
 440                                 add_mlist(inet_ntoa(saddrin),
 441                                         dirpath);
 442                         if (debug)
 443                                 warnx("mount successful");
 444                         if (do_log)
 445                                 syslog(LOG_NOTICE,
 446                                     "mount request succeeded from %s for %s",
 447                                     inet_ntoa(saddrin), dirpath);
 448                 } else {
 449                         bad = EACCES;
 450                         syslog(LOG_NOTICE,
 451                             "mount request denied from %s for %s",
 452                             inet_ntoa(saddrin), dirpath);
 453                 }
 454
 455                 if (bad && !svc_sendreply(transp, xdr_long, (caddr_t)&bad))
 456                         syslog(LOG_ERR, "can't send reply");
 457                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 458                 return;
 459         case RPCMNT_DUMP:
 460                 if (!svc_sendreply(transp, xdr_mlist, (caddr_t)NULL))
 461                         syslog(LOG_ERR, "can't send reply");
 462                 else if (do_log)
 463                         syslog(LOG_NOTICE,
 464                             "dump request succeeded from %s",
 465                             inet_ntoa(saddrin));
 466                 return;
 467         case RPCMNT_UMOUNT:
 468                 if (sport >= IPPORT_RESERVED && resvport_only) {
 469                         syslog(LOG_NOTICE,
 470                             "umount request from %s from unprivileged port",
 471                             inet_ntoa(saddrin));
 472                         svcerr_weakauth(transp);
 473                         return;
 474                 }
 475                 if (!svc_getargs(transp, xdr_dir, rpcpath)) {
 476                         syslog(LOG_NOTICE, "undecodable umount request from %s",
 477                             inet_ntoa(saddrin));
 478                         svcerr_decode(transp);
 479                         return;
 480                 }
 481                 if (realpath(rpcpath, dirpath) == NULL) {
 482                         syslog(LOG_NOTICE, "umount request from %s "
 483                             "for non existent path %s",
 484                             inet_ntoa(saddrin), dirpath);
 485                 }
 486                 if (!svc_sendreply(transp, xdr_void, (caddr_t)NULL))
 487                         syslog(LOG_ERR, "can't send reply");
 488                 hp = gethostbyaddr((caddr_t)&saddr, sizeof(saddr), AF_INET);
 489                 if (hp)
 490                         del_mlist(hp->h_name, dirpath);
 491                 del_mlist(inet_ntoa(saddrin), dirpath);
 492                 if (do_log)
 493                         syslog(LOG_NOTICE,
 494                             "umount request succeeded from %s for %s",
 495                             inet_ntoa(saddrin), dirpath);
 496                 return;
 497         case RPCMNT_UMNTALL:
 498                 if (sport >= IPPORT_RESERVED && resvport_only) {
 499                         syslog(LOG_NOTICE,
 500                             "umountall request from %s from unprivileged port",
 501                             inet_ntoa(saddrin));
 502                         svcerr_weakauth(transp);
 503                         return;
 504                 }
 505                 if (!svc_sendreply(transp, xdr_void, (caddr_t)NULL))
 506                         syslog(LOG_ERR, "can't send reply");
 507                 hp = gethostbyaddr((caddr_t)&saddr, sizeof(saddr), AF_INET);
 508                 if (hp)
 509                         del_mlist(hp->h_name, (char *)NULL);
 510                 del_mlist(inet_ntoa(saddrin), (char *)NULL);
 511                 if (do_log)
 512                         syslog(LOG_NOTICE,
 513                             "umountall request succeeded from %s",
 514                             inet_ntoa(saddrin));
 515                 return;
 516         case RPCMNT_EXPORT:
 517                 if (!svc_sendreply(transp, xdr_explist, (caddr_t)NULL))
 518                         syslog(LOG_ERR, "can't send reply");
 519                 if (do_log)
 520                         syslog(LOG_NOTICE,
 521                             "export request succeeded from %s",
 522                             inet_ntoa(saddrin));
 523                 return;
 524         default:
 525                 svcerr_noproc(transp);
 526                 return;
 527         }
 528 }
 529
 530 /*
 531  * Xdr conversion for a dirpath string
 532  */
 533 int
 534 xdr_dir(XDR *xdrsp, char *dirp)
 535 {
 536         return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
 537 }
 538
 539 /*
 540  * Xdr routine to generate file handle reply
 541  */
 542 int
 543 xdr_fhs(XDR *xdrsp, caddr_t cp)
 544 {
 545         struct fhreturn *fhrp = (struct fhreturn *)cp;
 546         u_long ok = 0, len, auth;
 547
 548         if (!xdr_long(xdrsp, &ok))
 549                 return (0);
 550         switch (fhrp->fhr_vers) {
 551         case 1:
 552                 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH));
 553         case 3:
 554                 len = NFSX_V3FH;
 555                 if (!xdr_long(xdrsp, &len))
 556                         return (0);
 557                 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len))
 558                         return (0);
 559                 if (fhrp->fhr_flag & DP_KERB)
 560                         auth = RPCAUTH_KERB4;
 561                 else
 562                         auth = RPCAUTH_UNIX;
 563                 len = 1;
 564                 if (!xdr_long(xdrsp, &len))
 565                         return (0);
 566                 return (xdr_long(xdrsp, &auth));
 567         };
 568         return (0);
 569 }
 570
 571 int
 572 xdr_mlist(XDR *xdrsp, caddr_t cp)
 573 {
 574         struct mountlist *mlp;
 575         int true = 1;
 576         int false = 0;
 577         char *strp;
 578
 579         mlp = mlhead;
 580         while (mlp) {
 581                 if (!xdr_bool(xdrsp, &true))
 582                         return (0);
 583                 strp = &mlp->ml_host[0];
 584                 if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
 585                         return (0);
 586                 strp = &mlp->ml_dirp[0];
 587                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 588                         return (0);
 589                 mlp = mlp->ml_next;
 590         }
 591         if (!xdr_bool(xdrsp, &false))
 592                 return (0);
 593         return (1);
 594 }
 595
 596 /*
 597  * Xdr conversion for export list
 598  */
 599 int
 600 xdr_explist(XDR *xdrsp, caddr_t cp)
 601 {
 602         struct exportlist *ep;
 603         int false = 0;
 604         int putdef;
 605         sigset_t sighup_mask;
 606
 607         sigemptyset(&sighup_mask);
 608         sigaddset(&sighup_mask, SIGHUP);
 609         sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
 610         ep = exphead;
 611         while (ep) {
 612                 putdef = 0;
 613                 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir, &putdef))
 614                         goto errout;
 615                 if (ep->ex_defdir && putdef == 0 &&
 616                         put_exlist(ep->ex_defdir, xdrsp, (struct dirlist *)NULL,
 617                         &putdef))
 618                         goto errout;
 619                 ep = ep->ex_next;
 620         }
 621         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 622         if (!xdr_bool(xdrsp, &false))
 623                 return (0);
 624         return (1);
 625 errout:
 626         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 627         return (0);
 628 }
 629
 630 /*
 631  * Called from xdr_explist() to traverse the tree and export the
 632  * directory paths.
 633  */
 634 int
 635 put_exlist(struct dirlist *dp, XDR *xdrsp, struct dirlist *adp, int *putdefp)
 636 {
 637         struct grouplist *grp;
 638         struct hostlist *hp;
 639         int true = 1;
 640         int false = 0;
 641         int gotalldir = 0;
 642         char *strp;
 643
 644         if (dp) {
 645                 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp))
 646                         return (1);
 647                 if (!xdr_bool(xdrsp, &true))
 648                         return (1);
 649                 strp = dp->dp_dirp;
 650                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 651                         return (1);
 652                 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) {
 653                         gotalldir = 1;
 654                         *putdefp = 1;
 655                 }
 656                 if ((dp->dp_flag & DP_DEFSET) == 0 &&
 657                     (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) {
 658                         hp = dp->dp_hosts;
 659                         while (hp) {
 660                                 grp = hp->ht_grp;
 661                                 if (grp->gr_type == GT_HOST) {
 662                                         if (!xdr_bool(xdrsp, &true))
 663                                                 return (1);
 664                                         strp = grp->gr_ptr.gt_hostent->h_name;
 665                                         if (!xdr_string(xdrsp, &strp,
 666                                             RPCMNT_NAMELEN))
 667                                                 return (1);
 668                                 } else if (grp->gr_type == GT_NET) {
 669                                         if (!xdr_bool(xdrsp, &true))
 670                                                 return (1);
 671                                         strp = grp->gr_ptr.gt_net.nt_name;
 672                                         if (!xdr_string(xdrsp, &strp,
 673                                             RPCMNT_NAMELEN))
 674                                                 return (1);
 675                                 }
 676                                 hp = hp->ht_next;
 677                                 if (gotalldir && hp == (struct hostlist *)NULL) {
 678                                         hp = adp->dp_hosts;
 679                                         gotalldir = 0;
 680                                 }
 681                         }
 682                 }
 683                 if (!xdr_bool(xdrsp, &false))
 684                         return (1);
 685                 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp))
 686                         return (1);
 687         }
 688         return (0);
 689 }
 690
 691 #define LINESIZ 10240
 692 char line[LINESIZ];
 693 FILE *exp_file;
 694
 695 /*
 696  * Get the export list
 697  */
 698 void
 699 get_exportlist(void)
 700 {
 701         struct exportlist *ep, *ep2;
 702         struct grouplist *grp, *tgrp;
 703         struct exportlist **epp;
 704         struct dirlist *dirhead;
 705         struct statfs fsb, *fsp;
 706         struct hostent *hpe;
 707         struct ucred anon;
 708         char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc;
 709         int len, has_host, exflags, got_nondir, dirplen, num, i, netgrp;
 710
 711         dirp = NULL;
 712         dirplen = 0;
 713
 714         /*
 715          * First, get rid of the old list
 716          */
 717         ep = exphead;
 718         while (ep) {
 719                 ep2 = ep;
 720                 ep = ep->ex_next;
 721                 free_exp(ep2);
 722         }
 723         exphead = (struct exportlist *)NULL;
 724
 725         grp = grphead;
 726         while (grp) {
 727                 tgrp = grp;
 728                 grp = grp->gr_next;
 729                 free_grp(tgrp);
 730         }
 731         grphead = (struct grouplist *)NULL;
 732
 733         /*
 734          * And delete exports that are in the kernel for all local
 735          * file systems.
 736          * XXX: Should know how to handle all local exportable file systems
 737          *      instead of just "ufs".
 738          */
 739         num = getmntinfo(&fsp, MNT_NOWAIT);
 740         for (i = 0; i < num; i++) {
 741                 union {
 742                         struct ufs_args ua;
 743                         struct iso_args ia;
 744                         struct mfs_args ma;
 745                         struct msdosfs_args da;
 746                         struct ntfs_args na;
 747                 } targs;
 748
 749                 if (!strcmp(fsp->f_fstypename, "mfs") ||
 750                     !strcmp(fsp->f_fstypename, "ufs") ||
 751                     !strcmp(fsp->f_fstypename, "msdos") ||
 752                     !strcmp(fsp->f_fstypename, "ntfs") ||
 753                     !strcmp(fsp->f_fstypename, "cd9660")) {
 754                         targs.ua.fspec = NULL;
 755                         targs.ua.export.ex_flags = MNT_DELEXPORT;
 756                         if (mount(fsp->f_fstypename, fsp->f_mntonname,
 757                                   fsp->f_flags | MNT_UPDATE,
 758                                   (caddr_t)&targs) < 0)
 759                                 syslog(LOG_ERR, "can't delete exports for %s",
 760                                        fsp->f_mntonname);
 761                 }
 762                 fsp++;
 763         }
 764
 765         /*
 766          * Read in the exports file and build the list, calling
 767          * mount() as we go along to push the export rules into the kernel.
 768          */
 769         if ((exp_file = fopen(exname, "r")) == NULL) {
 770                 syslog(LOG_ERR, "can't open %s", exname);
 771                 exit(2);
 772         }
 773         dirhead = (struct dirlist *)NULL;
 774         while (get_line()) {
 775                 if (debug)
 776                         warnx("got line %s", line);
 777                 cp = line;
 778                 nextfield(&cp, &endcp);
 779                 if (*cp == '#')
 780                         goto nextline;
 781
 782                 /*
 783                  * Set defaults.
 784                  */
 785                 has_host = FALSE;
 786                 anon = def_anon;
 787                 exflags = MNT_EXPORTED;
 788                 got_nondir = 0;
 789                 opt_flags = 0;
 790                 ep = (struct exportlist *)NULL;
 791
 792                 /*
 793                  * Create new exports list entry
 794                  */
 795                 len = endcp-cp;
 796                 tgrp = grp = get_grp();
 797                 while (len > 0) {
 798                         if (len > RPCMNT_NAMELEN) {
 799                             getexp_err(ep, tgrp);
 800                             goto nextline;
 801                         }
 802                         if (*cp == '-') {
 803                             if (ep == (struct exportlist *)NULL) {
 804                                 getexp_err(ep, tgrp);
 805                                 goto nextline;
 806                             }
 807                             if (debug)
 808                                 warnx("doing opt %s", cp);
 809                             got_nondir = 1;
 810                             if (do_opt(&cp, &endcp, ep, grp, &has_host,
 811                                 &exflags, &anon)) {
 812                                 getexp_err(ep, tgrp);
 813                                 goto nextline;
 814                             }
 815                         } else if (*cp == '/') {
 816                             savedc = *endcp;
 817                             *endcp = '\0';
 818                             if (check_dirpath(cp) &&
 819                                 statfs(cp, &fsb) >= 0) {
 820                                 if (got_nondir) {
 821                                     syslog(LOG_ERR, "dirs must be first");
 822                                     getexp_err(ep, tgrp);
 823                                     goto nextline;
 824                                 }
 825                                 if (ep) {
 826                                     if (ep->ex_fs.val[0] != fsb.f_fsid.val[0] ||
 827                                         ep->ex_fs.val[1] != fsb.f_fsid.val[1]) {
 828                                         getexp_err(ep, tgrp);
 829                                         goto nextline;
 830                                     }
 831                                 } else {
 832                                     /*
 833                                      * See if this directory is already
 834                                      * in the list.
 835                                      */
 836                                     ep = ex_search(&fsb.f_fsid);
 837                                     if (ep == (struct exportlist *)NULL) {
 838                                         ep = get_exp();
 839                                         ep->ex_fs = fsb.f_fsid;
 840                                         ep->ex_fsdir = (char *)
 841                                             malloc(strlen(fsb.f_mntonname) + 1);
 842                                         if (ep->ex_fsdir)
 843                                             strcpy(ep->ex_fsdir,
 844                                                 fsb.f_mntonname);
 845                                         else
 846                                             out_of_mem();
 847                                         if (debug)
 848                                           warnx("making new ep fs=0x%x,0x%x",
 849                                               fsb.f_fsid.val[0],
 850                                               fsb.f_fsid.val[1]);
 851                                     } else if (debug)
 852                                         warnx("found ep fs=0x%x,0x%x",
 853                                             fsb.f_fsid.val[0],
 854                                             fsb.f_fsid.val[1]);
 855                                 }
 856
 857                                 /*
 858                                  * Add dirpath to export mount point.
 859                                  */
 860                                 dirp = add_expdir(&dirhead, cp, len);
 861                                 dirplen = len;
 862                             } else {
 863                                 getexp_err(ep, tgrp);
 864                                 goto nextline;
 865                             }
 866                             *endcp = savedc;
 867                         } else {
 868                             savedc = *endcp;
 869                             *endcp = '\0';
 870                             got_nondir = 1;
 871                             if (ep == (struct exportlist *)NULL) {
 872                                 getexp_err(ep, tgrp);
 873                                 goto nextline;
 874                             }
 875
 876                             /*
 877                              * Get the host or netgroup.
 878                              */
 879                             setnetgrent(cp);
 880                             netgrp = getnetgrent(&hst, &usr, &dom);
 881                             do {
 882                                 if (has_host) {
 883                                     grp->gr_next = get_grp();
 884                                     grp = grp->gr_next;
 885                                 }
 886                                 if (netgrp) {
 887                                     if (hst == 0) {
 888                                         syslog(LOG_ERR,
 889                                 "null hostname in netgroup %s, skipping", cp);
 890                                         grp->gr_type = GT_IGNORE;
 891                                     } else if (get_host(hst, grp, tgrp)) {
 892                                         syslog(LOG_ERR,
 893                         "bad host %s in netgroup %s, skipping", hst, cp);
 894                                         grp->gr_type = GT_IGNORE;
 895                                     }
 896                                 } else if (get_host(cp, grp, tgrp)) {
 897                                     syslog(LOG_ERR, "bad host %s, skipping", cp);
 898                                     grp->gr_type = GT_IGNORE;
 899                                 }
 900                                 has_host = TRUE;
 901                             } while (netgrp && getnetgrent(&hst, &usr, &dom));
 902                             endnetgrent();
 903                             *endcp = savedc;
 904                         }
 905                         cp = endcp;
 906                         nextfield(&cp, &endcp);
 907                         len = endcp - cp;
 908                 }
 909                 if (check_options(dirhead)) {
 910                         getexp_err(ep, tgrp);
 911                         goto nextline;
 912                 }
 913                 if (!has_host) {
 914                         grp->gr_type = GT_HOST;
 915                         if (debug)
 916                                 warnx("adding a default entry");
 917                         /* add a default group and make the grp list NULL */
 918                         hpe = (struct hostent *)malloc(sizeof(struct hostent));
 919                         if (hpe == (struct hostent *)NULL)
 920                                 out_of_mem();
 921                         hpe->h_name = strdup("Default");
 922                         hpe->h_addrtype = AF_INET;
 923                         hpe->h_length = sizeof (u_int32_t);
 924                         hpe->h_addr_list = (char **)NULL;
 925                         grp->gr_ptr.gt_hostent = hpe;
 926
 927                 /*
 928                  * Don't allow a network export coincide with a list of
 929                  * host(s) on the same line.
 930                  */
 931                 } else if ((opt_flags & OP_NET) && tgrp->gr_next) {
 932                         getexp_err(ep, tgrp);
 933                         goto nextline;
 934
 935                 /*
 936                  * If an export list was specified on this line, make sure
 937                  * that we have at least one valid entry, otherwise skip it.
 938                  */
 939                 } else {
 940                         grp = tgrp;
 941                         while (grp && grp->gr_type == GT_IGNORE)
 942                                 grp = grp->gr_next;
 943                         if (! grp) {
 944                             getexp_err(ep, tgrp);
 945                             goto nextline;
 946                         }
 947                 }
 948
 949                 /*
 950                  * Loop through hosts, pushing the exports into the kernel.
 951                  * After loop, tgrp points to the start of the list and
 952                  * grp points to the last entry in the list.
 953                  */
 954                 grp = tgrp;
 955                 do {
 956                     if (do_mount(ep, grp, exflags, &anon, dirp,
 957                         dirplen, &fsb)) {
 958                         getexp_err(ep, tgrp);
 959                         goto nextline;
 960                     }
 961                 } while (grp->gr_next && (grp = grp->gr_next));
 962
 963                 /*
 964                  * Success. Update the data structures.
 965                  */
 966                 if (has_host) {
 967                         hang_dirp(dirhead, tgrp, ep, opt_flags);
 968                         grp->gr_next = grphead;
 969                         grphead = tgrp;
 970                 } else {
 971                         hang_dirp(dirhead, (struct grouplist *)NULL, ep,
 972                                 opt_flags);
 973                         free_grp(grp);
 974                 }
 975                 dirhead = (struct dirlist *)NULL;
 976                 if ((ep->ex_flag & EX_LINKED) == 0) {
 977                         ep2 = exphead;
 978                         epp = &exphead;
 979
 980                         /*
 981                          * Insert in the list in alphabetical order.
 982                          */
 983                         while (ep2 && strcmp(ep2->ex_fsdir, ep->ex_fsdir) < 0) {
 984                                 epp = &ep2->ex_next;
 985                                 ep2 = ep2->ex_next;
 986                         }
 987                         if (ep2)
 988                                 ep->ex_next = ep2;
 989                         *epp = ep;
 990                         ep->ex_flag |= EX_LINKED;
 991                 }
 992 nextline:
 993                 if (dirhead) {
 994                         free_dir(dirhead);
 995                         dirhead = (struct dirlist *)NULL;
 996                 }
 997         }
 998         fclose(exp_file);
 999 }
1000
1001 /*
1002  * Allocate an export list element
1003  */
1004 struct exportlist *
1005 get_exp(void)
1006 {
1007         struct exportlist *ep;
1008
1009         ep = (struct exportlist *)malloc(sizeof (struct exportlist));
1010         if (ep == (struct exportlist *)NULL)
1011                 out_of_mem();
1012         memset(ep, 0, sizeof(struct exportlist));
1013         return (ep);
1014 }
1015
1016 /*
1017  * Allocate a group list element
1018  */
1019 struct grouplist *
1020 get_grp(void)
1021 {
1022         struct grouplist *gp;
1023
1024         gp = (struct grouplist *)malloc(sizeof (struct grouplist));
1025         if (gp == (struct grouplist *)NULL)
1026                 out_of_mem();
1027         memset(gp, 0, sizeof(struct grouplist));
1028         return (gp);
1029 }
1030
1031 /*
1032  * Clean up upon an error in get_exportlist().
1033  */
1034 void
1035 getexp_err(struct exportlist *ep, struct grouplist *grp)
1036 {
1037         struct grouplist *tgrp;
1038
1039         if (!(opt_flags & OP_QUIET))
1040                 syslog(LOG_ERR, "bad exports list line %s", line);
1041         if (ep && (ep->ex_flag & EX_LINKED) == 0)
1042                 free_exp(ep);
1043         while (grp) {
1044                 tgrp = grp;
1045                 grp = grp->gr_next;
1046                 free_grp(tgrp);
1047         }
1048 }
1049
1050 /*
1051  * Search the export list for a matching fs.
1052  */
1053 struct exportlist *
1054 ex_search(fsid_t *fsid)
1055 {
1056         struct exportlist *ep;
1057
1058         ep = exphead;
1059         while (ep) {
1060                 if (ep->ex_fs.val[0] == fsid->val[0] &&
1061                     ep->ex_fs.val[1] == fsid->val[1])
1062                         return (ep);
1063                 ep = ep->ex_next;
1064         }
1065         return (ep);
1066 }
1067
1068 /*
1069  * Add a directory path to the list.
1070  */
1071 char *
1072 add_expdir(struct dirlist **dpp, char *cp, int len)
1073 {
1074         struct dirlist *dp;
1075
1076         dp = (struct dirlist *)malloc(sizeof (struct dirlist) + len);
1077         if (dp == (struct dirlist *)NULL)
1078                 out_of_mem();
1079         dp->dp_left = *dpp;
1080         dp->dp_right = (struct dirlist *)NULL;
1081         dp->dp_flag = 0;
1082         dp->dp_hosts = (struct hostlist *)NULL;
1083         strcpy(dp->dp_dirp, cp);
1084         *dpp = dp;
1085         return (dp->dp_dirp);
1086 }
1087
1088 /*
1089  * Hang the dir list element off the dirpath binary tree as required
1090  * and update the entry for host.
1091  */
1092 void
1093 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep,
1094           int flags)
1095 {
1096         struct hostlist *hp;
1097         struct dirlist *dp2;
1098
1099         if (flags & OP_ALLDIRS) {
1100                 if (ep->ex_defdir)
1101                         free((caddr_t)dp);
1102                 else
1103                         ep->ex_defdir = dp;
1104                 if (grp == (struct grouplist *)NULL) {
1105                         ep->ex_defdir->dp_flag |= DP_DEFSET;
1106                         if (flags & OP_KERB)
1107                                 ep->ex_defdir->dp_flag |= DP_KERB;
1108                 } else while (grp) {
1109                         hp = get_ht();
1110                         if (flags & OP_KERB)
1111                                 hp->ht_flag |= DP_KERB;
1112                         hp->ht_grp = grp;
1113                         hp->ht_next = ep->ex_defdir->dp_hosts;
1114                         ep->ex_defdir->dp_hosts = hp;
1115                         grp = grp->gr_next;
1116                 }
1117         } else {
1118
1119                 /*
1120                  * Loop through the directories adding them to the tree.
1121                  */
1122                 while (dp) {
1123                         dp2 = dp->dp_left;
1124                         add_dlist(&ep->ex_dirl, dp, grp, flags);
1125                         dp = dp2;
1126                 }
1127         }
1128 }
1129
1130 /*
1131  * Traverse the binary tree either updating a node that is already there
1132  * for the new directory or adding the new node.
1133  */
1134 void
1135 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp,
1136           int flags)
1137 {
1138         struct dirlist *dp;
1139         struct hostlist *hp;
1140         int cmp;
1141
1142         dp = *dpp;
1143         if (dp) {
1144                 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp);
1145                 if (cmp > 0) {
1146                         add_dlist(&dp->dp_left, newdp, grp, flags);
1147                         return;
1148                 } else if (cmp < 0) {
1149                         add_dlist(&dp->dp_right, newdp, grp, flags);
1150                         return;
1151                 } else
1152                         free((caddr_t)newdp);
1153         } else {
1154                 dp = newdp;
1155                 dp->dp_left = (struct dirlist *)NULL;
1156                 *dpp = dp;
1157         }
1158         if (grp) {
1159
1160                 /*
1161                  * Hang all of the host(s) off of the directory point.
1162                  */
1163                 do {
1164                         hp = get_ht();
1165                         if (flags & OP_KERB)
1166                                 hp->ht_flag |= DP_KERB;
1167                         hp->ht_grp = grp;
1168                         hp->ht_next = dp->dp_hosts;
1169                         dp->dp_hosts = hp;
1170                         grp = grp->gr_next;
1171                 } while (grp);
1172         } else {
1173                 dp->dp_flag |= DP_DEFSET;
1174                 if (flags & OP_KERB)
1175                         dp->dp_flag |= DP_KERB;
1176         }
1177 }
1178
1179 /*
1180  * Search for a dirpath on the export point.
1181  */
1182 struct dirlist *
1183 dirp_search(struct dirlist *dp, char *dirpath)
1184 {
1185         int cmp;
1186
1187         if (dp) {
1188                 cmp = strcmp(dp->dp_dirp, dirpath);
1189                 if (cmp > 0)
1190                         return (dirp_search(dp->dp_left, dirpath));
1191                 else if (cmp < 0)
1192                         return (dirp_search(dp->dp_right, dirpath));
1193                 else
1194                         return (dp);
1195         }
1196         return (dp);
1197 }
1198
1199 /*
1200  * Scan for a host match in a directory tree.
1201  */
1202 int
1203 chk_host(struct dirlist *dp, u_int32_t saddr, int *defsetp, int *hostsetp)
1204 {
1205         struct hostlist *hp;
1206         struct grouplist *grp;
1207         u_int32_t **addrp;
1208
1209         if (dp) {
1210                 if (dp->dp_flag & DP_DEFSET)
1211                         *defsetp = dp->dp_flag;
1212                 hp = dp->dp_hosts;
1213                 while (hp) {
1214                         grp = hp->ht_grp;
1215                         switch (grp->gr_type) {
1216                         case GT_HOST:
1217                             addrp = (u_int32_t **)
1218                                 grp->gr_ptr.gt_hostent->h_addr_list;
1219                             while (*addrp) {
1220                                 if (**addrp == saddr) {
1221                                     *hostsetp = (hp->ht_flag | DP_HOSTSET);
1222                                     return (1);
1223                                 }
1224                                 addrp++;
1225                             }
1226                             break;
1227                         case GT_NET:
1228                             if ((saddr & grp->gr_ptr.gt_net.nt_mask) ==
1229                                 grp->gr_ptr.gt_net.nt_net) {
1230                                 *hostsetp = (hp->ht_flag | DP_HOSTSET);
1231                                 return (1);
1232                             }
1233                             break;
1234                         };
1235                         hp = hp->ht_next;
1236                 }
1237         }
1238         return (0);
1239 }
1240
1241 /*
1242  * Scan tree for a host that matches the address.
1243  */
1244 int
1245 scan_tree(struct dirlist *dp, u_int32_t saddr)
1246 {
1247         int defset, hostset;
1248
1249         if (dp) {
1250                 if (scan_tree(dp->dp_left, saddr))
1251                         return (1);
1252                 if (chk_host(dp, saddr, &defset, &hostset))
1253                         return (1);
1254                 if (scan_tree(dp->dp_right, saddr))
1255                         return (1);
1256         }
1257         return (0);
1258 }
1259
1260 /*
1261  * Traverse the dirlist tree and free it up.
1262  */
1263 void
1264 free_dir(struct dirlist *dp)
1265 {
1266
1267         if (dp) {
1268                 free_dir(dp->dp_left);
1269                 free_dir(dp->dp_right);
1270                 free_host(dp->dp_hosts);
1271                 free((caddr_t)dp);
1272         }
1273 }
1274
1275 /*
1276  * Parse the option string and update fields.
1277  * Option arguments may either be -<option>=<value> or
1278  * -<option> <value>
1279  */
1280 int
1281 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp,
1282        int *has_hostp, int *exflagsp, struct ucred *cr)
1283 {
1284         char *cpoptarg, *cpoptend;
1285         char *cp, *endcp, *cpopt, savedc, savedc2;
1286         int allflag, usedarg;
1287
1288         savedc2 = '\0';
1289         cpopt = *cpp;
1290         cpopt++;
1291         cp = *endcpp;
1292         savedc = *cp;
1293         *cp = '\0';
1294         while (cpopt && *cpopt) {
1295                 allflag = 1;
1296                 usedarg = -2;
1297                 if ((cpoptend = strchr(cpopt, ','))) {
1298                         *cpoptend++ = '\0';
1299                         if ((cpoptarg = strchr(cpopt, '=')))
1300                                 *cpoptarg++ = '\0';
1301                 } else {
1302                         if ((cpoptarg = strchr(cpopt, '=')))
1303                                 *cpoptarg++ = '\0';
1304                         else {
1305                                 *cp = savedc;
1306                                 nextfield(&cp, &endcp);
1307                                 **endcpp = '\0';
1308                                 if (endcp > cp && *cp != '-') {
1309                                         cpoptarg = cp;
1310                                         savedc2 = *endcp;
1311                                         *endcp = '\0';
1312                                         usedarg = 0;
1313                                 }
1314                         }
1315                 }
1316                 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) {
1317                         *exflagsp |= MNT_EXRDONLY;
1318                 } else if (cpoptarg && (!strcmp(cpopt, "maproot") ||
1319                     !(allflag = strcmp(cpopt, "mapall")) ||
1320                     !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) {
1321                         usedarg++;
1322                         parsecred(cpoptarg, cr);
1323                         if (allflag == 0) {
1324                                 *exflagsp |= MNT_EXPORTANON;
1325                                 opt_flags |= OP_MAPALL;
1326                         } else
1327                                 opt_flags |= OP_MAPROOT;
1328                 } else if (!strcmp(cpopt, "kerb") || !strcmp(cpopt, "k")) {
1329                         *exflagsp |= MNT_EXKERB;
1330                         opt_flags |= OP_KERB;
1331                 } else if (cpoptarg && (!strcmp(cpopt, "mask") ||
1332                         !strcmp(cpopt, "m"))) {
1333                         if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) {
1334                                 syslog(LOG_ERR, "bad mask: %s", cpoptarg);
1335                                 return (1);
1336                         }
1337                         usedarg++;
1338                         opt_flags |= OP_MASK;
1339                 } else if (cpoptarg && (!strcmp(cpopt, "network") ||
1340                         !strcmp(cpopt, "n"))) {
1341                         if (grp->gr_type != GT_NULL) {
1342                                 syslog(LOG_ERR, "network/host conflict");
1343                                 return (1);
1344                         } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) {
1345                                 syslog(LOG_ERR, "bad net: %s", cpoptarg);
1346                                 return (1);
1347                         }
1348                         grp->gr_type = GT_NET;
1349                         *has_hostp = 1;
1350                         usedarg++;
1351                         opt_flags |= OP_NET;
1352                 } else if (!strcmp(cpopt, "alldirs")) {
1353                         opt_flags |= OP_ALLDIRS;
1354                 } else if (!strcmp(cpopt, "public")) {
1355                         *exflagsp |= MNT_EXPUBLIC;
1356                 } else if (!strcmp(cpopt, "webnfs")) {
1357                         *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON);
1358                         opt_flags |= OP_MAPALL;
1359                 } else if (cpoptarg && !strcmp(cpopt, "index")) {
1360                         ep->ex_indexfile = strdup(cpoptarg);
1361                 } else if (!strcmp(cpopt, "quiet")) {
1362                         opt_flags |= OP_QUIET;
1363                 } else {
1364                         syslog(LOG_ERR, "bad opt %s", cpopt);
1365                         return (1);
1366                 }
1367                 if (usedarg >= 0) {
1368                         *endcp = savedc2;
1369                         **endcpp = savedc;
1370                         if (usedarg > 0) {
1371                                 *cpp = cp;
1372                                 *endcpp = endcp;
1373                         }
1374                         return (0);
1375                 }
1376                 cpopt = cpoptend;
1377         }
1378         **endcpp = savedc;
1379         return (0);
1380 }
1381
1382 /*
1383  * Translate a character string to the corresponding list of network
1384  * addresses for a hostname.
1385  */
1386 int
1387 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp)
1388 {
1389         struct grouplist *checkgrp;
1390         struct hostent *hp, *nhp;
1391         char **addrp, **naddrp;
1392         struct hostent t_host;
1393         int i;
1394         u_int32_t saddr;
1395         char *aptr[2];
1396
1397         if (grp->gr_type != GT_NULL)
1398                 return (1);
1399         if ((hp = gethostbyname(cp)) == NULL) {
1400                 if (isdigit(*cp)) {
1401                         saddr = inet_addr(cp);
1402                         if (saddr == -1) {
1403                                 syslog(LOG_ERR, "inet_addr failed for %s", cp);
1404                                 return (1);
1405                         }
1406                         if ((hp = gethostbyaddr((caddr_t)&saddr, sizeof (saddr),
1407                                 AF_INET)) == NULL) {
1408                                 hp = &t_host;
1409                                 hp->h_name = cp;
1410                                 hp->h_addrtype = AF_INET;
1411                                 hp->h_length = sizeof (u_int32_t);
1412                                 hp->h_addr_list = aptr;
1413                                 aptr[0] = (char *)&saddr;
1414                                 aptr[1] = (char *)NULL;
1415                         }
1416                 } else {
1417                         syslog(LOG_ERR, "gethostbyname failed for %s", cp);
1418                         return (1);
1419                 }
1420         }
1421         /*
1422          * Sanity check: make sure we don't already have an entry
1423          * for this host in the grouplist.
1424          */
1425         checkgrp = tgrp;
1426         while (checkgrp != NULL) {
1427                 if (checkgrp->gr_type == GT_HOST &&
1428                     checkgrp->gr_ptr.gt_hostent != NULL &&
1429                     (!strcmp(checkgrp->gr_ptr.gt_hostent->h_name, hp->h_name)
1430                 || *(u_int32_t *)checkgrp->gr_ptr.gt_hostent->h_addr ==
1431                         *(u_int32_t *)hp->h_addr)) {
1432                         grp->gr_type = GT_IGNORE;
1433                         return(0);
1434                 }
1435                 checkgrp = checkgrp->gr_next;
1436         }
1437
1438         grp->gr_type = GT_HOST;
1439         nhp = grp->gr_ptr.gt_hostent = (struct hostent *)
1440                 malloc(sizeof(struct hostent));
1441         if (nhp == (struct hostent *)NULL)
1442                 out_of_mem();
1443         memmove(nhp, hp, sizeof(struct hostent));
1444         i = strlen(hp->h_name)+1;
1445         nhp->h_name = (char *)malloc(i);
1446         if (nhp->h_name == (char *)NULL)
1447                 out_of_mem();
1448         memmove(nhp->h_name, hp->h_name, i);
1449         addrp = hp->h_addr_list;
1450         i = 1;
1451         while (*addrp++)
1452                 i++;
1453         naddrp = nhp->h_addr_list = (char **)malloc(i*sizeof(char *));
1454         if (naddrp == (char **)NULL)
1455                 out_of_mem();
1456         addrp = hp->h_addr_list;
1457         while (*addrp) {
1458                 *naddrp = (char *)malloc(hp->h_length);
1459                 if (*naddrp == (char *)NULL)
1460                     out_of_mem();
1461                 memmove(*naddrp, *addrp, hp->h_length);
1462                 addrp++;
1463                 naddrp++;
1464         }
1465         *naddrp = (char *)NULL;
1466         if (debug)
1467                 warnx("got host %s", hp->h_name);
1468         return (0);
1469 }
1470
1471 /*
1472  * Free up an exports list component
1473  */
1474 void
1475 free_exp(struct exportlist *ep)
1476 {
1477
1478         if (ep->ex_defdir) {
1479                 free_host(ep->ex_defdir->dp_hosts);
1480                 free((caddr_t)ep->ex_defdir);
1481         }
1482         if (ep->ex_fsdir)
1483                 free(ep->ex_fsdir);
1484         if (ep->ex_indexfile)
1485                 free(ep->ex_indexfile);
1486         free_dir(ep->ex_dirl);
1487         free((caddr_t)ep);
1488 }
1489
1490 /*
1491  * Free hosts.
1492  */
1493 void
1494 free_host(struct hostlist *hp)
1495 {
1496         struct hostlist *hp2;
1497
1498         while (hp) {
1499                 hp2 = hp;
1500                 hp = hp->ht_next;
1501                 free((caddr_t)hp2);
1502         }
1503 }
1504
1505 struct hostlist *
1506 get_ht(void)
1507 {
1508         struct hostlist *hp;
1509
1510         hp = (struct hostlist *)malloc(sizeof (struct hostlist));
1511         if (hp == (struct hostlist *)NULL)
1512                 out_of_mem();
1513         hp->ht_next = (struct hostlist *)NULL;
1514         hp->ht_flag = 0;
1515         return (hp);
1516 }
1517
1518 /*
1519  * Out of memory, fatal
1520  */
1521 void
1522 out_of_mem(void)
1523 {
1524
1525         syslog(LOG_ERR, "out of memory");
1526         exit(2);
1527 }
1528
1529 /*
1530  * Do the mount syscall with the update flag to push the export info into
1531  * the kernel.
1532  */
1533 int
1534 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags,
1535          struct ucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb)
1536 {
1537         struct statfs fsb1;
1538         char *cp = NULL;
1539         u_int32_t **addrp;
1540         int done;
1541         char savedc = '\0';
1542         struct sockaddr_in sin, imask;
1543         union {
1544                 struct ufs_args ua;
1545                 struct iso_args ia;
1546                 struct mfs_args ma;
1547 #ifdef __NetBSD__
1548                 struct msdosfs_args da;
1549 #endif
1550                 struct ntfs_args na;
1551         } args;
1552         u_int32_t net;
1553
1554         args.ua.fspec = 0;
1555         args.ua.export.ex_flags = exflags;
1556         args.ua.export.ex_anon = *anoncrp;
1557         args.ua.export.ex_indexfile = ep->ex_indexfile;
1558         memset(&sin, 0, sizeof(sin));
1559         memset(&imask, 0, sizeof(imask));
1560         sin.sin_family = AF_INET;
1561         sin.sin_len = sizeof(sin);
1562         imask.sin_family = AF_INET;
1563         imask.sin_len = sizeof(sin);
1564         if (grp->gr_type == GT_HOST)
1565                 addrp = (u_int32_t **)grp->gr_ptr.gt_hostent->h_addr_list;
1566         else
1567                 addrp = (u_int32_t **)NULL;
1568         done = FALSE;
1569         while (!done) {
1570                 switch (grp->gr_type) {
1571                 case GT_HOST:
1572                         if (addrp) {
1573                                 sin.sin_addr.s_addr = **addrp;
1574                                 args.ua.export.ex_addrlen = sizeof(sin);
1575                         } else
1576                                 args.ua.export.ex_addrlen = 0;
1577                         args.ua.export.ex_addr = (struct sockaddr *)&sin;
1578                         args.ua.export.ex_masklen = 0;
1579                         break;
1580                 case GT_NET:
1581                         if (grp->gr_ptr.gt_net.nt_mask)
1582                             imask.sin_addr.s_addr = grp->gr_ptr.gt_net.nt_mask;
1583                         else {
1584                             net = ntohl(grp->gr_ptr.gt_net.nt_net);
1585                             if (IN_CLASSA(net))
1586                                 imask.sin_addr.s_addr = inet_addr("255.0.0.0");
1587                             else if (IN_CLASSB(net))
1588                                 imask.sin_addr.s_addr =
1589                                     inet_addr("255.255.0.0");
1590                             else
1591                                 imask.sin_addr.s_addr =
1592                                     inet_addr("255.255.255.0");
1593                             grp->gr_ptr.gt_net.nt_mask = imask.sin_addr.s_addr;
1594                         }
1595                         sin.sin_addr.s_addr = grp->gr_ptr.gt_net.nt_net;
1596                         args.ua.export.ex_addr = (struct sockaddr *)&sin;
1597                         args.ua.export.ex_addrlen = sizeof (sin);
1598                         args.ua.export.ex_mask = (struct sockaddr *)&imask;
1599                         args.ua.export.ex_masklen = sizeof (imask);
1600                         break;
1601                 case GT_IGNORE:
1602                         return(0);
1603                         break;
1604                 default:
1605                         syslog(LOG_ERR, "bad grouptype");
1606                         if (cp)
1607                                 *cp = savedc;
1608                         return (1);
1609                 };
1610
1611                 /*
1612                  * XXX:
1613                  * Maybe I should just use the fsb->f_mntonname path instead
1614                  * of looping back up the dirp to the mount point??
1615                  * Also, needs to know how to export all types of local
1616                  * exportable file systems and not just "ufs".
1617                  */
1618                 while (mount(fsb->f_fstypename, dirp,
1619                        fsb->f_flags | MNT_UPDATE, (caddr_t)&args) < 0) {
1620                         if (cp)
1621                                 *cp-- = savedc;
1622                         else
1623                                 cp = dirp + dirplen - 1;
1624                         if (opt_flags & OP_QUIET)
1625                                 return (1);
1626                         if (errno == EPERM) {
1627                                 syslog(LOG_ERR,
1628                                    "can't change attributes for %s", dirp);
1629                                 return (1);
1630                         }
1631                         if (opt_flags & OP_ALLDIRS) {
1632                                 if (errno == EINVAL)
1633                                         syslog(LOG_ERR,
1634                 "-alldirs requested but %s is not a filesystem mountpoint",
1635                                                 dirp);
1636                                 else
1637                                         syslog(LOG_ERR,
1638                                                 "could not remount %s: %m",
1639                                                 dirp);
1640                                 return (1);
1641                         }
1642                         /* back up over the last component */
1643                         while (*cp == '/' && cp > dirp)
1644                                 cp--;
1645                         while (*(cp - 1) != '/' && cp > dirp)
1646                                 cp--;
1647                         if (cp == dirp) {
1648                                 if (debug)
1649                                         warnx("mnt unsucc");
1650                                 syslog(LOG_ERR, "can't export %s", dirp);
1651                                 return (1);
1652                         }
1653                         savedc = *cp;
1654                         *cp = '\0';
1655                         /* Check that we're still on the same filesystem. */
1656                         if (statfs(dirp, &fsb1) != 0 || bcmp(&fsb1.f_fsid,
1657                             &fsb->f_fsid, sizeof(fsb1.f_fsid)) != 0) {
1658                                 *cp = savedc;
1659                                 syslog(LOG_ERR, "can't export %s", dirp);
1660                                 return (1);
1661                         }
1662                 }
1663                 if (addrp) {
1664                         ++addrp;
1665                         if (*addrp == (u_int32_t *)NULL)
1666                                 done = TRUE;
1667                 } else
1668                         done = TRUE;
1669         }
1670         if (cp)
1671                 *cp = savedc;
1672         return (0);
1673 }
1674
1675 /*
1676  * Translate a net address.
1677  */
1678 int
1679 get_net(char *cp, struct netmsk *net, int maskflg)
1680 {
1681         struct netent *np;
1682         long netaddr;
1683         struct in_addr inetaddr, inetaddr2;
1684         char *name;
1685
1686         if (isdigit(*cp) && ((netaddr = inet_network(cp)) != -1)) {
1687                 inetaddr = inet_makeaddr(netaddr, 0);
1688                 /*
1689                  * Due to arbitrary subnet masks, you don't know how many
1690                  * bits to shift the address to make it into a network,
1691                  * however you do know how to make a network address into
1692                  * a host with host == 0 and then compare them.
1693                  * (What a pest)
1694                  */
1695                 if (!maskflg) {
1696                         setnetent(0);
1697                         while ((np = getnetent())) {
1698                                 inetaddr2 = inet_makeaddr(np->n_net, 0);
1699                                 if (inetaddr2.s_addr == inetaddr.s_addr)
1700                                         break;
1701                         }
1702                         endnetent();
1703                 }
1704         } else if ((np = getnetbyname(cp)) != NULL) {
1705                 inetaddr = inet_makeaddr(np->n_net, 0);
1706         } else
1707                 return (1);
1708
1709         if (maskflg)
1710                 net->nt_mask = inetaddr.s_addr;
1711         else {
1712                 if (np)
1713                         name = np->n_name;
1714                 else
1715                         name = inet_ntoa(inetaddr);
1716                 net->nt_name = (char *)malloc(strlen(name) + 1);
1717                 if (net->nt_name == (char *)NULL)
1718                         out_of_mem();
1719                 strcpy(net->nt_name, name);
1720                 net->nt_net = inetaddr.s_addr;
1721         }
1722         return (0);
1723 }
1724
1725 /*
1726  * Parse out the next white space separated field
1727  */
1728 void
1729 nextfield(char **cp, char **endcp)
1730 {
1731         char *p;
1732
1733         p = *cp;
1734         while (*p == ' ' || *p == '\t')
1735                 p++;
1736         if (*p == '\n' || *p == '\0')
1737                 *cp = *endcp = p;
1738         else {
1739                 *cp = p++;
1740                 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
1741                         p++;
1742                 *endcp = p;
1743         }
1744 }
1745
1746 /*
1747  * Get an exports file line. Skip over blank lines and handle line
1748  * continuations.
1749  */
1750 int
1751 get_line(void)
1752 {
1753         char *p, *cp;
1754         int len;
1755         int totlen, cont_line;
1756
1757         /*
1758          * Loop around ignoring blank lines and getting all continuation lines.
1759          */
1760         p = line;
1761         totlen = 0;
1762         do {
1763                 if (fgets(p, LINESIZ - totlen, exp_file) == NULL)
1764                         return (0);
1765                 len = strlen(p);
1766                 cp = p + len - 1;
1767                 cont_line = 0;
1768                 while (cp >= p &&
1769                     (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) {
1770                         if (*cp == '\\')
1771                                 cont_line = 1;
1772                         cp--;
1773                         len--;
1774                 }
1775                 if (cont_line) {
1776                         *++cp = ' ';
1777                         len++;
1778                 }
1779                 *++cp = '\0';
1780                 if (len > 0) {
1781                         totlen += len;
1782                         if (totlen >= LINESIZ) {
1783                                 syslog(LOG_ERR, "exports line too long");
1784                                 exit(2);
1785                         }
1786                         p = cp;
1787                 }
1788         } while (totlen == 0 || cont_line);
1789         return (1);
1790 }
1791
1792 /*
1793  * Parse a description of a credential.
1794  */
1795 void
1796 parsecred(char *namelist, struct ucred *cr)
1797 {
1798         char *name;
1799         int cnt;
1800         char *names;
1801         struct passwd *pw;
1802         struct group *gr;
1803         int ngroups, groups[NGROUPS + 1];
1804
1805         /*
1806          * Set up the unprivileged user.
1807          */
1808         cr->cr_ref = 1;
1809         cr->cr_uid = -2;
1810         cr->cr_groups[0] = -2;
1811         cr->cr_ngroups = 1;
1812         /*
1813          * Get the user's password table entry.
1814          */
1815         names = strsep(&namelist, " \t\n");
1816         name = strsep(&names, ":");
1817         if (isdigit(*name) || *name == '-')
1818                 pw = getpwuid(atoi(name));
1819         else
1820                 pw = getpwnam(name);
1821         /*
1822          * Credentials specified as those of a user.
1823          */
1824         if (names == NULL) {
1825                 if (pw == NULL) {
1826                         syslog(LOG_ERR, "unknown user: %s", name);
1827                         return;
1828                 }
1829                 cr->cr_uid = pw->pw_uid;
1830                 ngroups = NGROUPS + 1;
1831                 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups))
1832                         syslog(LOG_ERR, "too many groups");
1833                 /*
1834                  * Convert from int's to gid_t's and compress out duplicate
1835                  */
1836                 cr->cr_ngroups = ngroups - 1;
1837                 cr->cr_groups[0] = groups[0];
1838                 for (cnt = 2; cnt < ngroups; cnt++)
1839                         cr->cr_groups[cnt - 1] = groups[cnt];
1840                 return;
1841         }
1842         /*
1843          * Explicit credential specified as a colon separated list:
1844          *      uid:gid:gid:...
1845          */
1846         if (pw != NULL)
1847                 cr->cr_uid = pw->pw_uid;
1848         else if (isdigit(*name) || *name == '-')
1849                 cr->cr_uid = atoi(name);
1850         else {
1851                 syslog(LOG_ERR, "unknown user: %s", name);
1852                 return;
1853         }
1854         cr->cr_ngroups = 0;
1855         while (names != NULL && *names != '\0' && cr->cr_ngroups < NGROUPS) {
1856                 name = strsep(&names, ":");
1857                 if (isdigit(*name) || *name == '-') {
1858                         cr->cr_groups[cr->cr_ngroups++] = atoi(name);
1859                 } else {
1860                         if ((gr = getgrnam(name)) == NULL) {
1861                                 syslog(LOG_ERR, "unknown group: %s", name);
1862                                 continue;
1863                         }
1864                         cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid;
1865                 }
1866         }
1867         if (names != NULL && *names != '\0' && cr->cr_ngroups == NGROUPS)
1868                 syslog(LOG_ERR, "too many groups");
1869 }
1870
1871 #define STRSIZ  (RPCMNT_NAMELEN+RPCMNT_PATHLEN+50)
1872 /*
1873  * Routines that maintain the remote mounttab
1874  */
1875 void
1876 get_mountlist(void)
1877 {
1878         struct mountlist *mlp, **mlpp;
1879         char *host, *dirp, *cp;
1880         char str[STRSIZ];
1881         FILE *mlfile;
1882
1883         if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) {
1884                 if (errno == ENOENT)
1885                         return;
1886                 else {
1887                         syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST);
1888                         return;
1889                 }
1890         }
1891         mlpp = &mlhead;
1892         while (fgets(str, STRSIZ, mlfile) != NULL) {
1893                 cp = str;
1894                 host = strsep(&cp, " \t\n");
1895                 dirp = strsep(&cp, " \t\n");
1896                 if (host == NULL || dirp == NULL)
1897                         continue;
1898                 mlp = (struct mountlist *)malloc(sizeof (*mlp));
1899                 if (mlp == (struct mountlist *)NULL)
1900                         out_of_mem();
1901                 strncpy(mlp->ml_host, host, RPCMNT_NAMELEN);
1902                 mlp->ml_host[RPCMNT_NAMELEN] = '\0';
1903                 strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN);
1904                 mlp->ml_dirp[RPCMNT_PATHLEN] = '\0';
1905                 mlp->ml_next = (struct mountlist *)NULL;
1906                 *mlpp = mlp;
1907                 mlpp = &mlp->ml_next;
1908         }
1909         fclose(mlfile);
1910 }
1911
1912 void
1913 del_mlist(char *hostp, char *dirp)
1914 {
1915         struct mountlist *mlp, **mlpp;
1916         struct mountlist *mlp2;
1917         FILE *mlfile;
1918         int fnd = 0;
1919
1920         mlpp = &mlhead;
1921         mlp = mlhead;
1922         while (mlp) {
1923                 if (!strcmp(mlp->ml_host, hostp) &&
1924                     (!dirp || !strcmp(mlp->ml_dirp, dirp))) {
1925                         fnd = 1;
1926                         mlp2 = mlp;
1927                         *mlpp = mlp = mlp->ml_next;
1928                         free((caddr_t)mlp2);
1929                 } else {
1930                         mlpp = &mlp->ml_next;
1931                         mlp = mlp->ml_next;
1932                 }
1933         }
1934         if (fnd) {
1935                 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) {
1936                         syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST);
1937                         return;
1938                 }
1939                 mlp = mlhead;
1940                 while (mlp) {
1941                         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
1942                         mlp = mlp->ml_next;
1943                 }
1944                 fclose(mlfile);
1945         }
1946 }
1947
1948 void
1949 add_mlist(char *hostp, char *dirp)
1950 {
1951         struct mountlist *mlp, **mlpp;
1952         FILE *mlfile;
1953
1954         mlpp = &mlhead;
1955         mlp = mlhead;
1956         while (mlp) {
1957                 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp))
1958                         return;
1959                 mlpp = &mlp->ml_next;
1960                 mlp = mlp->ml_next;
1961         }
1962         mlp = (struct mountlist *)malloc(sizeof (*mlp));
1963         if (mlp == (struct mountlist *)NULL)
1964                 out_of_mem();
1965         strncpy(mlp->ml_host, hostp, RPCMNT_NAMELEN);
1966         mlp->ml_host[RPCMNT_NAMELEN] = '\0';
1967         strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN);
1968         mlp->ml_dirp[RPCMNT_PATHLEN] = '\0';
1969         mlp->ml_next = (struct mountlist *)NULL;
1970         *mlpp = mlp;
1971         if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
1972                 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST);
1973                 return;
1974         }
1975         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
1976         fclose(mlfile);
1977 }
1978
1979 /*
1980  * Free up a group list.
1981  */
1982 void
1983 free_grp(struct grouplist *grp)
1984 {
1985         char **addrp;
1986
1987         if (grp->gr_type == GT_HOST) {
1988                 if (grp->gr_ptr.gt_hostent->h_name) {
1989                         addrp = grp->gr_ptr.gt_hostent->h_addr_list;
1990                         while (addrp && *addrp)
1991                                 free(*addrp++);
1992                         free((caddr_t)grp->gr_ptr.gt_hostent->h_addr_list);
1993                         free(grp->gr_ptr.gt_hostent->h_name);
1994                 }
1995                 free((caddr_t)grp->gr_ptr.gt_hostent);
1996         } else if (grp->gr_type == GT_NET) {
1997                 if (grp->gr_ptr.gt_net.nt_name)
1998                         free(grp->gr_ptr.gt_net.nt_name);
1999         }
2000         free((caddr_t)grp);
2001 }
2002
2003 #ifdef DEBUG
2004 void
2005 SYSLOG(int pri, const char *fmt, ...)
2006 {
2007         va_list ap;
2008
2009         va_start(ap, fmt);
2010         vfprintf(stderr, fmt, ap);
2011         va_end(ap);
2012 }
2013 #endif /* DEBUG */
2014
2015 /*
2016  * Check options for consistency.
2017  */
2018 int
2019 check_options(struct dirlist *dp)
2020 {
2021
2022         if (dp == (struct dirlist *)NULL)
2023             return (1);
2024         if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL) ||
2025             (opt_flags & (OP_MAPROOT | OP_KERB)) == (OP_MAPROOT | OP_KERB) ||
2026             (opt_flags & (OP_MAPALL | OP_KERB)) == (OP_MAPALL | OP_KERB)) {
2027             syslog(LOG_ERR, "-mapall, -maproot and -kerb mutually exclusive");
2028             return (1);
2029         }
2030         if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) {
2031                 syslog(LOG_ERR, "-mask requires -network");
2032                 return (1);
2033         }
2034         if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
2035             syslog(LOG_ERR, "-alldirs has multiple directories");
2036             return (1);
2037         }
2038         return (0);
2039 }
2040
2041 /*
2042  * Check an absolute directory path for any symbolic links. Return true
2043  * if no symbolic links are found.
2044  */
2045 int
2046 check_dirpath(char *dirp)
2047 {
2048         char *cp;
2049         int ret = 1;
2050         struct stat sb;
2051
2052         cp = dirp + 1;
2053         while (*cp && ret) {
2054                 if (*cp == '/') {
2055                         *cp = '\0';
2056                         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
2057                                 ret = 0;
2058                         *cp = '/';
2059                 }
2060                 cp++;
2061         }
2062         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
2063                 ret = 0;
2064         return (ret);
2065 }
2066
2067 /*
2068  * Just translate an ascii string to an integer.
2069  */
2070 int
2071 get_num(char *cp)
2072 {
2073         int res = 0;
2074
2075         while (*cp) {
2076                 if (*cp < '0' || *cp > '9')
2077                         return (-1);
2078                 res = res * 10 + (*cp++ - '0');
2079         }
2080         return (res);
2081 }