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  */
  40
  41 #include <sys/param.h>
  42 #include <sys/mount.h>
  43 #include <sys/mountctl.h>
  44 #include <sys/fcntl.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 <rpc/pmap_prot.h>
  52 #include <rpcsvc/mount.h>
  53 #include <vfs/nfs/rpcv2.h>
  54 #include <vfs/nfs/nfsproto.h>
  55 #include <vfs/nfs/nfs.h>
  56 #include <vfs/ufs/ufsmount.h>
  57 #include <vfs/msdosfs/msdosfsmount.h>
  58 #include <vfs/ntfs/ntfsmount.h>
  59 #include <vfs/isofs/cd9660/cd9660_mount.h>      /* XXX need isofs in include */
  60
  61 #include <arpa/inet.h>
  62
  63 #include <ctype.h>
  64 #include <err.h>
  65 #include <errno.h>
  66 #include <grp.h>
  67 #include <netdb.h>
  68 #include <pwd.h>
  69 #include <signal.h>
  70 #include <stdio.h>
  71 #include <stdlib.h>
  72 #include <string.h>
  73 #include <unistd.h>
  74 #include "pathnames.h"
  75
  76 #ifdef DEBUG
  77 #include <stdarg.h>
  78 #endif
  79
  80 #ifndef MOUNTDLOCK
  81 #define MOUNTDLOCK "/var/run/mountd.lock"
  82 #endif
  83
  84 /*
  85  * Structures for keeping the mount list and export list
  86  */
  87 struct mountlist {
  88         struct mountlist *ml_next;
  89         char    ml_host[RPCMNT_NAMELEN+1];
  90         char    ml_dirp[RPCMNT_PATHLEN+1];
  91 };
  92
  93 struct dirlist {
  94         struct dirlist  *dp_left;
  95         struct dirlist  *dp_right;
  96         int             dp_flag;
  97         struct hostlist *dp_hosts;      /* List of hosts this dir exported to */
  98         char            dp_dirp[1];     /* Actually malloc'd to size of dir */
  99 };
 100 /* dp_flag bits */
 101 #define DP_DEFSET       0x1
 102 #define DP_HOSTSET      0x2
 103 #define DP_KERB         0x4
 104
 105 struct exportlist {
 106         struct exportlist *ex_next;
 107         struct dirlist  *ex_dirl;
 108         struct dirlist  *ex_defdir;
 109         int             ex_flag;
 110         fsid_t          ex_fs;
 111         char            *ex_fsdir;
 112         char            *ex_indexfile;
 113 };
 114 /* ex_flag bits */
 115 #define EX_LINKED       0x1
 116
 117 struct netmsk {
 118         struct sockaddr_storage nt_net;
 119         u_int32_t       nt_mask;
 120         char            *nt_name;
 121 };
 122
 123 union grouptypes {
 124         struct addrinfo *gt_addrinfo;
 125         struct netmsk   gt_net;
 126 };
 127
 128 struct grouplist {
 129         int gr_type;
 130         union grouptypes gr_ptr;
 131         struct grouplist *gr_next;
 132 };
 133 /* Group types */
 134 #define GT_NULL         0x0
 135 #define GT_HOST         0x1
 136 #define GT_NET          0x2
 137 #define GT_DEFAULT      0x3
 138 #define GT_IGNORE       0x5
 139
 140 struct hostlist {
 141         int              ht_flag;       /* Uses DP_xx bits */
 142         struct grouplist *ht_grp;
 143         struct hostlist  *ht_next;
 144 };
 145
 146 struct fhreturn {
 147         int     fhr_flag;
 148         int     fhr_vers;
 149         nfsfh_t fhr_fh;
 150 };
 151
 152 /* Global defs */
 153 char    *add_expdir(struct dirlist **, char *, int);
 154 void    add_dlist(struct dirlist **, struct dirlist *,
 155                                 struct grouplist *, int);
 156 void    add_mlist(char *, char *);
 157 int     check_dirpath(char *);
 158 int     check_options(struct dirlist *);
 159 int     chk_host(struct dirlist *, struct sockaddr *, int *, int *);
 160 void    del_mlist(char *, char *);
 161 struct dirlist *dirp_search(struct dirlist *, char *);
 162 int     do_mount(struct exportlist *, struct grouplist *, int,
 163                 struct ucred *, char *, int, struct statfs *);
 164 int     do_opt(char **, char **, struct exportlist *, struct grouplist *,
 165                                 int *, int *, struct ucred *);
 166 struct  exportlist *ex_search(fsid_t *);
 167 struct  exportlist *get_exp(void);
 168 void    free_dir(struct dirlist *);
 169 void    free_exp(struct exportlist *);
 170 void    free_grp(struct grouplist *);
 171 void    free_host(struct hostlist *);
 172 void    get_exportlist(void);
 173 int     get_host(char *, struct grouplist *, struct grouplist *);
 174 struct hostlist *get_ht(void);
 175 int     get_line(void);
 176 void    get_mountlist(void);
 177 int     get_net(char *, struct netmsk *, int);
 178 void    getexp_err(struct exportlist *, struct grouplist *);
 179 struct grouplist *get_grp(void);
 180 void    hang_dirp(struct dirlist *, struct grouplist *,
 181                                 struct exportlist *, int);
 182 void    huphandler(int sig);
 183 void    mntsrv(struct svc_req *, SVCXPRT *);
 184 void    nextfield(char **, char **);
 185 void    out_of_mem(void);
 186 void    parsecred(char *, struct ucred *);
 187 int     put_exlist(struct dirlist *, XDR *, struct dirlist *, int *);
 188 int     scan_tree(struct dirlist *, struct sockaddr *);
 189 static void usage(void);
 190 int     xdr_dir(XDR *, char *);
 191 int     xdr_explist(XDR *, caddr_t);
 192 int     xdr_fhs(XDR *, caddr_t);
 193 int     xdr_mlist(XDR *, caddr_t);
 194 void    terminate(int);
 195
 196 static int      allones(struct sockaddr_storage *, int);
 197 static int      bitcmp(void *, void *, int);
 198 static int      countones(struct sockaddr *);
 199 static int      netpartcmp(struct sockaddr *, struct sockaddr *, int);
 200 static int      sacmp(struct sockaddr *, struct sockaddr *);
 201
 202 struct exportlist *exphead;
 203 struct mountlist *mlhead;
 204 struct grouplist *grphead;
 205 char exname[MAXPATHLEN];
 206 struct ucred def_anon = {
 207         1,
 208         (uid_t) -2,
 209         1,
 210         { (gid_t) -2 }
 211 };
 212 int force_v2 = 0;
 213 int resvport_only = 1;
 214 int dir_only = 1;
 215 int do_log = 0;
 216 int got_sighup = 0;
 217
 218 int opt_flags;
 219 static int have_v6 = 1;
 220 #ifdef NI_WITHSCOPEID
 221 static const int ninumeric = NI_NUMERICHOST | NI_WITHSCOPEID;
 222 #else
 223 static const int ninumeric = NI_NUMERICHOST;
 224 #endif
 225
 226 int mountdlockfd;
 227 /* Bits for above */
 228 #define OP_MAPROOT      0x01
 229 #define OP_MAPALL       0x02
 230 #define OP_KERB         0x04
 231 #define OP_MASK         0x08
 232 #define OP_NET          0x10
 233 #define OP_ALLDIRS      0x40
 234 /* 0x80 is OP_HAVEMASK in FreeBSD 5+ */
 235 #define OP_QUIET        0x100
 236 #define OP_MASKLEN      0x200
 237
 238 #ifdef DEBUG
 239 int debug = 1;
 240 void    SYSLOG(int, const char *, ...);
 241 #define syslog SYSLOG
 242 #else
 243 int debug = 0;
 244 #endif
 245
 246 /*
 247  * Mountd server for NFS mount protocol as described in:
 248  * NFS: Network File System Protocol Specification, RFC1094, Appendix A
 249  * The optional arguments are the exports file name
 250  * default: _PATH_EXPORTS
 251  * and "-n" to allow nonroot mount.
 252  */
 253 int
 254 main(int argc, char **argv)
 255 {
 256         fd_set readfds;
 257         SVCXPRT *udptransp, *tcptransp, *udp6transp, *tcp6transp;
 258         struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf;
 259         int udpsock, tcpsock, udp6sock, tcp6sock;
 260         int xcreated = 0, s;
 261         int one = 1;
 262         int c, error, mib[3];
 263         struct vfsconf vfc;
 264
 265         udp6conf = tcp6conf = NULL;
 266         udp6sock = tcp6sock = 0;
 267
 268         /* Check that another mountd isn't already running. */
 269         if ((mountdlockfd = (open(MOUNTDLOCK, O_RDONLY|O_CREAT, 0444))) == -1)
 270                 err(1, "%s", MOUNTDLOCK);
 271
 272         if(flock(mountdlockfd, LOCK_EX|LOCK_NB) == -1 && errno == EWOULDBLOCK)
 273                 errx(1, "another rpc.mountd is already running. Aborting");
 274         s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
 275         if (s < 0)
 276                 have_v6 = 0;
 277         else
 278                 close(s);
 279         error = getvfsbyname("nfs", &vfc);
 280         if (error && vfsisloadable("nfs")) {
 281                 if(vfsload("nfs"))
 282                         err(1, "vfsload(nfs)");
 283                 endvfsent();    /* flush cache */
 284                 error = getvfsbyname("nfs", &vfc);
 285         }
 286         if (error)
 287                 errx(1, "NFS support is not available in the running kernel");
 288
 289         while ((c = getopt(argc, argv, "2dlnr")) != -1)
 290                 switch (c) {
 291                 case '2':
 292                         force_v2 = 1;
 293                         break;
 294                 case 'n':
 295                         resvport_only = 0;
 296                         break;
 297                 case 'r':
 298                         dir_only = 0;
 299                         break;
 300                 case 'd':
 301                         debug = debug ? 0 : 1;
 302                         break;
 303                 case 'l':
 304                         do_log = 1;
 305                         break;
 306                 default:
 307                         usage();
 308                 };
 309         argc -= optind;
 310         argv += optind;
 311         grphead = NULL;
 312         exphead = NULL;
 313         mlhead = NULL;
 314         if (argc == 1) {
 315                 strncpy(exname, *argv, MAXPATHLEN-1);
 316                 exname[MAXPATHLEN-1] = '\0';
 317         } else
 318                 strcpy(exname, _PATH_EXPORTS);
 319         openlog("mountd", LOG_PID, LOG_DAEMON);
 320         if (debug)
 321                 warnx("getting export list");
 322         get_exportlist();
 323         if (debug)
 324                 warnx("getting mount list");
 325         get_mountlist();
 326         if (debug)
 327                 warnx("here we go");
 328         if (debug == 0) {
 329                 daemon(0, 0);
 330                 signal(SIGINT, SIG_IGN);
 331                 signal(SIGQUIT, SIG_IGN);
 332         }
 333         signal(SIGHUP, huphandler);
 334         signal(SIGTERM, terminate);
 335         { FILE *pidfile = fopen(_PATH_MOUNTDPID, "w");
 336           if (pidfile != NULL) {
 337                 fprintf(pidfile, "%d\n", getpid());
 338                 fclose(pidfile);
 339           }
 340         }
 341         rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL);
 342         rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL);
 343         udpsock  = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 344         tcpsock  = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 345         udpconf  = getnetconfigent("udp");
 346         tcpconf  = getnetconfigent("tcp");
 347         if (!have_v6)
 348                 goto skip_v6;
 349         udp6sock = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
 350         tcp6sock = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
 351         /*
 352          * We're doing host-based access checks here, so don't allow
 353          * v4-in-v6 to confuse things. The kernel will disable it
 354          * by default on NFS sockets too.
 355          */
 356         if (udp6sock != -1 && setsockopt(udp6sock, IPPROTO_IPV6,
 357                 IPV6_BINDV6ONLY, &one, sizeof one) < 0){
 358                 syslog(LOG_ERR, "can't disable v4-in-v6 on UDP socket");
 359                 exit(1);
 360         }
 361         if (tcp6sock != -1 && setsockopt(tcp6sock, IPPROTO_IPV6,
 362                 IPV6_BINDV6ONLY, &one, sizeof one) < 0){
 363                 syslog(LOG_ERR, "can't disable v4-in-v6 on UDP socket");
 364                 exit(1);
 365         }
 366         udp6conf = getnetconfigent("udp6");
 367         tcp6conf = getnetconfigent("tcp6");
 368
 369 skip_v6:
 370         if (!resvport_only) {
 371                 mib[0] = CTL_VFS;
 372                 mib[1] = vfc.vfc_typenum;
 373                 mib[2] = NFS_NFSPRIVPORT;
 374                 if (sysctl(mib, 3, NULL, NULL, &resvport_only,
 375                     sizeof(resvport_only)) != 0 && errno != ENOENT) {
 376                         syslog(LOG_ERR, "sysctl: %m");
 377                         exit(1);
 378                 }
 379         }
 380         if ((udptransp = svcudp_create(RPC_ANYSOCK)) == NULL ||
 381             (tcptransp = svctcp_create(RPC_ANYSOCK, 0, 0)) == NULL) {
 382                 syslog(LOG_ERR, "can't create socket");
 383                 exit(1);
 384         }
 385         if (udpsock != -1 && udpconf != NULL) {
 386                 bindresvport(udpsock, NULL);
 387                 udptransp = svc_dg_create(udpsock, 0, 0);
 388                 if (udptransp != NULL) {
 389                         if (!svc_reg(udptransp, RPCPROG_MNT, RPCMNT_VER1,
 390                             mntsrv, udpconf))
 391                                 syslog(LOG_WARNING, "can't register UDP RPCMNT_VER1 service");
 392                         else
 393                                 xcreated++;
 394                         if (!force_v2) {
 395                                 if (!svc_reg(udptransp, RPCPROG_MNT, RPCMNT_VER3,
 396                                     mntsrv, udpconf))
 397                                         syslog(LOG_WARNING, "can't register UDP RPCMNT_VER3 service");
 398                                 else
 399                                         xcreated++;
 400                         }
 401                 } else
 402                         syslog(LOG_WARNING, "can't create UDP services");
 403
 404         }
 405         if (tcpsock != -1 && tcpconf != NULL) {
 406                 bindresvport(tcpsock, NULL);
 407                 listen(tcpsock, SOMAXCONN);
 408                 tcptransp = svc_vc_create(tcpsock, 0, 0);
 409                 if (tcptransp != NULL) {
 410                         if (!svc_reg(tcptransp, RPCPROG_MNT, RPCMNT_VER1,
 411                             mntsrv, tcpconf))
 412                                 syslog(LOG_WARNING, "can't register TCP RPCMNT_VER1 service");
 413                         else
 414                                 xcreated++;
 415                         if (!force_v2) {
 416                                 if (!svc_reg(tcptransp, RPCPROG_MNT, RPCMNT_VER3,
 417                                     mntsrv, tcpconf))
 418                                         syslog(LOG_WARNING, "can't register TCP RPCMNT_VER3 service");
 419                                 else
 420                                         xcreated++;
 421                         }
 422                 } else
 423                         syslog(LOG_WARNING, "can't create TCP service");
 424
 425         }
 426         if (have_v6 && udp6sock != -1 && udp6conf != NULL) {
 427                 bindresvport(udp6sock, NULL);
 428                 udp6transp = svc_dg_create(udp6sock, 0, 0);
 429                 if (udp6transp != NULL) {
 430                         if (!svc_reg(udp6transp, RPCPROG_MNT, RPCMNT_VER1,
 431                             mntsrv, udp6conf))
 432                                 syslog(LOG_WARNING, "can't register UDP6 RPCMNT_VER1 service");
 433                         else
 434                                 xcreated++;
 435                         if (!force_v2) {
 436                                 if (!svc_reg(udp6transp, RPCPROG_MNT, RPCMNT_VER3,
 437                                     mntsrv, udp6conf))
 438                                         syslog(LOG_WARNING, "can't register UDP6 RPCMNT_VER3 service");
 439                                 else
 440                                         xcreated++;
 441                         }
 442                 } else
 443                         syslog(LOG_WARNING, "can't create UDP6 service");
 444
 445         }
 446         if (have_v6 && tcp6sock != -1 && tcp6conf != NULL) {
 447                 bindresvport(tcp6sock, NULL);
 448                 listen(tcp6sock, SOMAXCONN);
 449                 tcp6transp = svc_vc_create(tcp6sock, 0, 0);
 450                 if (tcp6transp != NULL) {
 451                         if (!svc_reg(tcp6transp, RPCPROG_MNT, RPCMNT_VER1,
 452                             mntsrv, tcp6conf))
 453                                 syslog(LOG_WARNING, "can't register TCP6 RPCMNT_VER1 service");
 454                         else
 455                                 xcreated++;
 456                         if (!force_v2) {
 457                                 if (!svc_reg(tcp6transp, RPCPROG_MNT, RPCMNT_VER3,
 458                                     mntsrv, tcp6conf))
 459                                         syslog(LOG_WARNING, "can't register TCP6 RPCMNT_VER3 service");
 460                                         else
 461                                                 xcreated++;
 462                                 }
 463                 } else
 464                         syslog(LOG_WARNING, "can't create TCP6 service");
 465
 466         }
 467         if (xcreated == 0) {
 468                 syslog(LOG_ERR, "could not create any services");
 469                 exit(1);
 470         }
 471
 472         /* Expand svc_run() here so that we can call get_exportlist(). */
 473         for (;;) {
 474                 if (got_sighup) {
 475                         get_exportlist();
 476                         got_sighup = 0;
 477                 }
 478                 readfds = svc_fdset;
 479                 switch (select(svc_maxfd + 1, &readfds, NULL, NULL, NULL)) {
 480                 case -1:
 481                         if (errno == EINTR)
 482                                 continue;
 483                         syslog(LOG_ERR, "mountd died: select: %m");
 484                         exit(1);
 485                 case 0:
 486                         continue;
 487                 default:
 488                         svc_getreqset(&readfds);
 489                 }
 490         }
 491 }
 492
 493 static void
 494 usage(void)
 495 {
 496         fprintf(stderr,
 497                 "usage: mountd [-2] [-d] [-l] [-n] [-r] [export_file]\n");
 498         exit(1);
 499 }
 500
 501 /*
 502  * The mount rpc service
 503  */
 504 void
 505 mntsrv(struct svc_req *rqstp, SVCXPRT *transp)
 506 {
 507         struct exportlist *ep;
 508         struct dirlist *dp;
 509         struct fhreturn fhr;
 510         struct stat stb;
 511         struct statfs fsb;
 512         struct addrinfo *ai;
 513         char host[NI_MAXHOST], numerichost[NI_MAXHOST];
 514         int lookup_failed = 1;
 515         struct sockaddr *saddr;
 516         u_short sport;
 517         char rpcpath[RPCMNT_PATHLEN + 1], dirpath[MAXPATHLEN];
 518         int bad = 0, defset, hostset;
 519         sigset_t sighup_mask;
 520
 521         sigemptyset(&sighup_mask);
 522         sigaddset(&sighup_mask, SIGHUP);
 523         saddr = svc_getrpccaller(transp)->buf;
 524         switch (saddr->sa_family) {
 525         case AF_INET6:
 526                 sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port);
 527                 break;
 528         case AF_INET:
 529                 sport = ntohs(((struct sockaddr_in *)saddr)->sin_port);
 530                 break;
 531         default:
 532                 syslog(LOG_ERR, "request from unknown address family");
 533                 return;
 534         }
 535         lookup_failed = getnameinfo(saddr, saddr->sa_len, host, sizeof host,
 536             NULL, 0, 0);
 537         getnameinfo(saddr, saddr->sa_len, numerichost,
 538             sizeof numerichost, NULL, 0, NI_NUMERICHOST);
 539         ai = NULL;
 540         switch (rqstp->rq_proc) {
 541         case NULLPROC:
 542                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
 543                         syslog(LOG_ERR, "can't send reply");
 544                 return;
 545         case RPCMNT_MOUNT:
 546                 if (sport >= IPPORT_RESERVED && resvport_only) {
 547                         syslog(LOG_NOTICE,
 548                             "mount request from %s from unprivileged port",
 549                             numerichost);
 550                         svcerr_weakauth(transp);
 551                         return;
 552                 }
 553                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
 554                         syslog(LOG_NOTICE, "undecodable mount request from %s",
 555                             numerichost);
 556                         svcerr_decode(transp);
 557                         return;
 558                 }
 559
 560                 /*
 561                  * Get the real pathname and make sure it is a directory
 562                  * or a regular file if the -r option was specified
 563                  * and it exists.
 564                  */
 565                 if (realpath(rpcpath, dirpath) == NULL ||
 566                     stat(dirpath, &stb) < 0 ||
 567                     (!S_ISDIR(stb.st_mode) &&
 568                     (dir_only || !S_ISREG(stb.st_mode))) ||
 569                     statfs(dirpath, &fsb) < 0) {
 570                         chdir("/");     /* Just in case realpath doesn't */
 571                         syslog(LOG_NOTICE,
 572                             "mount request from %s for non existent path %s",
 573                             numerichost, dirpath);
 574                         if (debug)
 575                                 warnx("stat failed on %s", dirpath);
 576                         bad = ENOENT;   /* We will send error reply later */
 577                 }
 578
 579                 /* Check in the exports list */
 580                 sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
 581                 ep = ex_search(&fsb.f_fsid);
 582                 hostset = defset = 0;
 583                 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset) ||
 584                     ((dp = dirp_search(ep->ex_dirl, dirpath)) &&
 585                       chk_host(dp, saddr, &defset, &hostset)) ||
 586                     (defset && scan_tree(ep->ex_defdir, saddr) == 0 &&
 587                      scan_tree(ep->ex_dirl, saddr) == 0))) {
 588                         if (bad) {
 589                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
 590                                     &bad))
 591                                         syslog(LOG_ERR, "can't send reply");
 592                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 593                                 return;
 594                         }
 595                         if (hostset & DP_HOSTSET)
 596                                 fhr.fhr_flag = hostset;
 597                         else
 598                                 fhr.fhr_flag = defset;
 599                         fhr.fhr_vers = rqstp->rq_vers;
 600                         /* Get the file handle */
 601                         memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t));
 602                         if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) {
 603                                 bad = errno;
 604                                 syslog(LOG_ERR, "can't get fh for %s", dirpath);
 605                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
 606                                     &bad))
 607                                         syslog(LOG_ERR, "can't send reply");
 608                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 609                                 return;
 610                         }
 611                         if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs, &fhr))
 612                                 syslog(LOG_ERR, "can't send reply");
 613                         if (!lookup_failed)
 614                                 add_mlist(host, dirpath);
 615                         else
 616                                 add_mlist(numerichost, dirpath);
 617                         if (debug)
 618                                 warnx("mount successful");
 619                         if (do_log)
 620                                 syslog(LOG_NOTICE,
 621                                     "mount request succeeded from %s for %s",
 622                                     numerichost, dirpath);
 623                 } else {
 624                         bad = EACCES;
 625                         syslog(LOG_NOTICE,
 626                             "mount request denied from %s for %s",
 627                             numerichost, dirpath);
 628                 }
 629
 630                 if (bad && !svc_sendreply(transp, (xdrproc_t)xdr_long, &bad))
 631                         syslog(LOG_ERR, "can't send reply");
 632                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 633                 return;
 634         case RPCMNT_DUMP:
 635                 if (!svc_sendreply(transp, (xdrproc_t)xdr_mlist, NULL))
 636                         syslog(LOG_ERR, "can't send reply");
 637                 else if (do_log)
 638                         syslog(LOG_NOTICE,
 639                             "dump request succeeded from %s",
 640                             numerichost);
 641                 return;
 642         case RPCMNT_UMOUNT:
 643                 if (sport >= IPPORT_RESERVED && resvport_only) {
 644                         syslog(LOG_NOTICE,
 645                             "umount request from %s from unprivileged port",
 646                             numerichost);
 647                         svcerr_weakauth(transp);
 648                         return;
 649                 }
 650                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
 651                         syslog(LOG_NOTICE, "undecodable umount request from %s",
 652                             numerichost);
 653                         svcerr_decode(transp);
 654                         return;
 655                 }
 656                 if (realpath(rpcpath, dirpath) == NULL) {
 657                         syslog(LOG_NOTICE, "umount request from %s "
 658                             "for non existent path %s",
 659                             numerichost, dirpath);
 660                 }
 661                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
 662                         syslog(LOG_ERR, "can't send reply");
 663                 if (!lookup_failed)
 664                         del_mlist(host, dirpath);
 665                 del_mlist(numerichost, dirpath);
 666                 if (do_log)
 667                         syslog(LOG_NOTICE,
 668                             "umount request succeeded from %s for %s",
 669                             numerichost, dirpath);
 670                 return;
 671         case RPCMNT_UMNTALL:
 672                 if (sport >= IPPORT_RESERVED && resvport_only) {
 673                         syslog(LOG_NOTICE,
 674                             "umountall request from %s from unprivileged port",
 675                             numerichost);
 676                         svcerr_weakauth(transp);
 677                         return;
 678                 }
 679                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
 680                         syslog(LOG_ERR, "can't send reply");
 681                 if (!lookup_failed)
 682                         del_mlist(host, NULL);
 683                 del_mlist(numerichost, NULL);
 684                 if (do_log)
 685                         syslog(LOG_NOTICE,
 686                             "umountall request succeeded from %s",
 687                             numerichost);
 688                 return;
 689         case RPCMNT_EXPORT:
 690                 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, NULL))
 691                         syslog(LOG_ERR, "can't send reply");
 692                 if (do_log)
 693                         syslog(LOG_NOTICE,
 694                             "export request succeeded from %s",
 695                             numerichost);
 696                 return;
 697         default:
 698                 svcerr_noproc(transp);
 699                 return;
 700         }
 701 }
 702
 703 /*
 704  * Xdr conversion for a dirpath string
 705  */
 706 int
 707 xdr_dir(XDR *xdrsp, char *dirp)
 708 {
 709         return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
 710 }
 711
 712 /*
 713  * Xdr routine to generate file handle reply
 714  */
 715 int
 716 xdr_fhs(XDR *xdrsp, caddr_t cp)
 717 {
 718         struct fhreturn *fhrp = (struct fhreturn *)cp;
 719         u_long ok = 0, len, auth;
 720
 721         if (!xdr_long(xdrsp, &ok))
 722                 return (0);
 723         switch (fhrp->fhr_vers) {
 724         case 1:
 725                 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH));
 726         case 3:
 727                 len = NFSX_V3FH;
 728                 if (!xdr_long(xdrsp, &len))
 729                         return (0);
 730                 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len))
 731                         return (0);
 732                 if (fhrp->fhr_flag & DP_KERB)
 733                         auth = RPCAUTH_KERB4;
 734                 else
 735                         auth = RPCAUTH_UNIX;
 736                 len = 1;
 737                 if (!xdr_long(xdrsp, &len))
 738                         return (0);
 739                 return (xdr_long(xdrsp, &auth));
 740         };
 741         return (0);
 742 }
 743
 744 int
 745 xdr_mlist(XDR *xdrsp, caddr_t cp)
 746 {
 747         struct mountlist *mlp;
 748         int true = 1;
 749         int false = 0;
 750         char *strp;
 751
 752         mlp = mlhead;
 753         while (mlp) {
 754                 if (!xdr_bool(xdrsp, &true))
 755                         return (0);
 756                 strp = &mlp->ml_host[0];
 757                 if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
 758                         return (0);
 759                 strp = &mlp->ml_dirp[0];
 760                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 761                         return (0);
 762                 mlp = mlp->ml_next;
 763         }
 764         if (!xdr_bool(xdrsp, &false))
 765                 return (0);
 766         return (1);
 767 }
 768
 769 /*
 770  * Xdr conversion for export list
 771  */
 772 int
 773 xdr_explist(XDR *xdrsp, caddr_t cp)
 774 {
 775         struct exportlist *ep;
 776         int false = 0;
 777         int putdef;
 778         sigset_t sighup_mask;
 779
 780         sigemptyset(&sighup_mask);
 781         sigaddset(&sighup_mask, SIGHUP);
 782         sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
 783         ep = exphead;
 784         while (ep) {
 785                 putdef = 0;
 786                 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir, &putdef))
 787                         goto errout;
 788                 if (ep->ex_defdir && putdef == 0 &&
 789                         put_exlist(ep->ex_defdir, xdrsp, NULL,
 790                         &putdef))
 791                         goto errout;
 792                 ep = ep->ex_next;
 793         }
 794         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 795         if (!xdr_bool(xdrsp, &false))
 796                 return (0);
 797         return (1);
 798 errout:
 799         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 800         return (0);
 801 }
 802
 803 /*
 804  * Called from xdr_explist() to traverse the tree and export the
 805  * directory paths.
 806  */
 807 int
 808 put_exlist(struct dirlist *dp, XDR *xdrsp, struct dirlist *adp, int *putdefp)
 809 {
 810         struct grouplist *grp;
 811         struct hostlist *hp;
 812         int true = 1;
 813         int false = 0;
 814         int gotalldir = 0;
 815         char *strp;
 816
 817         if (dp) {
 818                 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp))
 819                         return (1);
 820                 if (!xdr_bool(xdrsp, &true))
 821                         return (1);
 822                 strp = dp->dp_dirp;
 823                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 824                         return (1);
 825                 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) {
 826                         gotalldir = 1;
 827                         *putdefp = 1;
 828                 }
 829                 if ((dp->dp_flag & DP_DEFSET) == 0 &&
 830                     (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) {
 831                         hp = dp->dp_hosts;
 832                         while (hp) {
 833                                 grp = hp->ht_grp;
 834                                 if (grp->gr_type == GT_HOST) {
 835                                         if (!xdr_bool(xdrsp, &true))
 836                                                 return (1);
 837                                         strp = grp->gr_ptr.gt_addrinfo->ai_canonname;
 838                                         if (!xdr_string(xdrsp, &strp,
 839                                             RPCMNT_NAMELEN))
 840                                                 return (1);
 841                                 } else if (grp->gr_type == GT_NET) {
 842                                         if (!xdr_bool(xdrsp, &true))
 843                                                 return (1);
 844                                         strp = grp->gr_ptr.gt_net.nt_name;
 845                                         if (!xdr_string(xdrsp, &strp,
 846                                             RPCMNT_NAMELEN))
 847                                                 return (1);
 848                                 }
 849                                 hp = hp->ht_next;
 850                                 if (gotalldir && hp == NULL) {
 851                                         hp = adp->dp_hosts;
 852                                         gotalldir = 0;
 853                                 }
 854                         }
 855                 }
 856                 if (!xdr_bool(xdrsp, &false))
 857                         return (1);
 858                 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp))
 859                         return (1);
 860         }
 861         return (0);
 862 }
 863
 864 #define LINESIZ 10240
 865 char line[LINESIZ];
 866 FILE *exp_file;
 867
 868 /*
 869  * Get the export list
 870  */
 871 void
 872 get_exportlist(void)
 873 {
 874         struct exportlist *ep, *ep2;
 875         struct grouplist *grp, *tgrp;
 876         struct exportlist **epp;
 877         struct dirlist *dirhead;
 878         struct statfs fsb, *fsp;
 879         struct ucred anon;
 880         char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc;
 881         int len, has_host, exflags, got_nondir, dirplen, num, i, netgrp;
 882
 883         dirp = NULL;
 884         dirplen = 0;
 885
 886         /*
 887          * First, get rid of the old list
 888          */
 889         ep = exphead;
 890         while (ep) {
 891                 ep2 = ep;
 892                 ep = ep->ex_next;
 893                 free_exp(ep2);
 894         }
 895         exphead = NULL;
 896
 897         grp = grphead;
 898         while (grp) {
 899                 tgrp = grp;
 900                 grp = grp->gr_next;
 901                 free_grp(tgrp);
 902         }
 903         grphead = NULL;
 904
 905         /*
 906          * And delete exports that are in the kernel for all local
 907          * file systems.
 908          * XXX: Should know how to handle all local exportable file systems
 909          *      instead of just "ufs".
 910          */
 911         num = getmntinfo(&fsp, MNT_NOWAIT);
 912         for (i = 0; i < num; i++) {
 913                 union {
 914                         struct ufs_args ua;
 915                         struct iso_args ia;
 916                         struct mfs_args ma;
 917                         struct msdosfs_args da;
 918                         struct ntfs_args na;
 919                 } targs;
 920                 struct export_args export;
 921
 922                 export.ex_flags = MNT_DELEXPORT;
 923                 if (mountctl(fsp->f_mntonname, MOUNTCTL_SET_EXPORT, -1,
 924                              &export, sizeof(export), NULL, 0) == 0) {
 925                 } else if (!strcmp(fsp->f_fstypename, "mfs") ||
 926                     !strcmp(fsp->f_fstypename, "ufs") ||
 927                     !strcmp(fsp->f_fstypename, "msdos") ||
 928                     !strcmp(fsp->f_fstypename, "ntfs") ||
 929                     !strcmp(fsp->f_fstypename, "cd9660")) {
 930                         targs.ua.fspec = NULL;
 931                         targs.ua.export.ex_flags = MNT_DELEXPORT;
 932                         if (mount(fsp->f_fstypename, fsp->f_mntonname,
 933                                   fsp->f_flags | MNT_UPDATE,
 934                                   (caddr_t)&targs) < 0)
 935                                 syslog(LOG_ERR, "can't delete exports for %s",
 936                                     fsp->f_mntonname);
 937                 }
 938                 fsp++;
 939         }
 940
 941         /*
 942          * Read in the exports file and build the list, calling
 943          * mount() as we go along to push the export rules into the kernel.
 944          */
 945         if ((exp_file = fopen(exname, "r")) == NULL) {
 946                 syslog(LOG_ERR, "can't open %s", exname);
 947                 exit(2);
 948         }
 949         dirhead = NULL;
 950         while (get_line()) {
 951                 if (debug)
 952                         warnx("got line %s", line);
 953                 cp = line;
 954                 nextfield(&cp, &endcp);
 955                 if (*cp == '#')
 956                         goto nextline;
 957
 958                 /*
 959                  * Set defaults.
 960                  */
 961                 has_host = FALSE;
 962                 anon = def_anon;
 963                 exflags = MNT_EXPORTED;
 964                 got_nondir = 0;
 965                 opt_flags = 0;
 966                 ep = NULL;
 967
 968                 /*
 969                  * Create new exports list entry
 970                  */
 971                 len = endcp-cp;
 972                 tgrp = grp = get_grp();
 973                 while (len > 0) {
 974                         if (len > RPCMNT_NAMELEN) {
 975                             getexp_err(ep, tgrp);
 976                             goto nextline;
 977                         }
 978                         if (*cp == '-') {
 979                             if (ep == NULL) {
 980                                 getexp_err(ep, tgrp);
 981                                 goto nextline;
 982                             }
 983                             if (debug)
 984                                 warnx("doing opt %s", cp);
 985                             got_nondir = 1;
 986                             if (do_opt(&cp, &endcp, ep, grp, &has_host,
 987                                 &exflags, &anon)) {
 988                                 getexp_err(ep, tgrp);
 989                                 goto nextline;
 990                             }
 991                         } else if (*cp == '/') {
 992                             savedc = *endcp;
 993                             *endcp = '\0';
 994                             if (check_dirpath(cp) &&
 995                                 statfs(cp, &fsb) >= 0) {
 996                                 if (got_nondir) {
 997                                     syslog(LOG_ERR, "dirs must be first");
 998                                     getexp_err(ep, tgrp);
 999                                     goto nextline;
1000                                 }
1001                                 if (ep) {
1002                                     if (ep->ex_fs.val[0] != fsb.f_fsid.val[0] ||
1003                                         ep->ex_fs.val[1] != fsb.f_fsid.val[1]) {
1004                                         getexp_err(ep, tgrp);
1005                                         goto nextline;
1006                                     }
1007                                 } else {
1008                                     /*
1009                                      * See if this directory is already
1010                                      * in the list.
1011                                      */
1012                                     ep = ex_search(&fsb.f_fsid);
1013                                     if (ep == NULL) {
1014                                         ep = get_exp();
1015                                         ep->ex_fs = fsb.f_fsid;
1016                                         ep->ex_fsdir = (char *)
1017                                             malloc(strlen(fsb.f_mntonname) + 1);
1018                                         if (ep->ex_fsdir)
1019                                             strcpy(ep->ex_fsdir,
1020                                                 fsb.f_mntonname);
1021                                         else
1022                                             out_of_mem();
1023                                         if (debug)
1024                                                 warnx("making new ep fs=0x%x,0x%x",
1025                                                     fsb.f_fsid.val[0],
1026                                                     fsb.f_fsid.val[1]);
1027                                     } else if (debug)
1028                                         warnx("found ep fs=0x%x,0x%x",
1029                                             fsb.f_fsid.val[0],
1030                                             fsb.f_fsid.val[1]);
1031                                 }
1032
1033                                 /*
1034                                  * Add dirpath to export mount point.
1035                                  */
1036                                 dirp = add_expdir(&dirhead, cp, len);
1037                                 dirplen = len;
1038                             } else {
1039                                 getexp_err(ep, tgrp);
1040                                 goto nextline;
1041                             }
1042                             *endcp = savedc;
1043                         } else {
1044                             savedc = *endcp;
1045                             *endcp = '\0';
1046                             got_nondir = 1;
1047                             if (ep == NULL) {
1048                                 getexp_err(ep, tgrp);
1049                                 goto nextline;
1050                             }
1051
1052                             /*
1053                              * Get the host or netgroup.
1054                              */
1055                             setnetgrent(cp);
1056                             netgrp = getnetgrent(&hst, &usr, &dom);
1057                             do {
1058                                 if (has_host) {
1059                                     grp->gr_next = get_grp();
1060                                     grp = grp->gr_next;
1061                                 }
1062                                 if (netgrp) {
1063                                     if (hst == NULL) {
1064                                         syslog(LOG_ERR,
1065                                 "null hostname in netgroup %s, skipping", cp);
1066                                         grp->gr_type = GT_IGNORE;
1067                                     } else if (get_host(hst, grp, tgrp)) {
1068                                         syslog(LOG_ERR,
1069                         "bad host %s in netgroup %s, skipping", hst, cp);
1070                                         grp->gr_type = GT_IGNORE;
1071                                     }
1072                                 } else if (get_host(cp, grp, tgrp)) {
1073                                     syslog(LOG_ERR, "bad host %s, skipping", cp);
1074                                     grp->gr_type = GT_IGNORE;
1075                                 }
1076                                 has_host = TRUE;
1077                             } while (netgrp && getnetgrent(&hst, &usr, &dom));
1078                             endnetgrent();
1079                             *endcp = savedc;
1080                         }
1081                         cp = endcp;
1082                         nextfield(&cp, &endcp);
1083                         len = endcp - cp;
1084                 }
1085                 if (check_options(dirhead)) {
1086                         getexp_err(ep, tgrp);
1087                         goto nextline;
1088                 }
1089                 if (!has_host) {
1090                         grp->gr_type = GT_DEFAULT;
1091                         if (debug)
1092                                 warnx("adding a default entry");
1093
1094                 /*
1095                  * Don't allow a network export coincide with a list of
1096                  * host(s) on the same line.
1097                  */
1098                 } else if ((opt_flags & OP_NET) && tgrp->gr_next) {
1099                         getexp_err(ep, tgrp);
1100                         goto nextline;
1101
1102                 /*
1103                  * If an export list was specified on this line, make sure
1104                  * that we have at least one valid entry, otherwise skip it.
1105                  */
1106                 } else {
1107                         grp = tgrp;
1108                         while (grp && grp->gr_type == GT_IGNORE)
1109                                 grp = grp->gr_next;
1110                         if (! grp) {
1111                             getexp_err(ep, tgrp);
1112                             goto nextline;
1113                         }
1114                 }
1115
1116                 /*
1117                  * Loop through hosts, pushing the exports into the kernel.
1118                  * After loop, tgrp points to the start of the list and
1119                  * grp points to the last entry in the list.
1120                  */
1121                 grp = tgrp;
1122                 do {
1123                         if (do_mount(ep, grp, exflags, &anon, dirp, dirplen,
1124                             &fsb)) {
1125                                 getexp_err(ep, tgrp);
1126                                 goto nextline;
1127                         }
1128                 } while (grp->gr_next && (grp = grp->gr_next));
1129
1130                 /*
1131                  * Success. Update the data structures.
1132                  */
1133                 if (has_host) {
1134                         hang_dirp(dirhead, tgrp, ep, opt_flags);
1135                         grp->gr_next = grphead;
1136                         grphead = tgrp;
1137                 } else {
1138                         hang_dirp(dirhead, NULL, ep,
1139                                 opt_flags);
1140                         free_grp(grp);
1141                 }
1142                 dirhead = NULL;
1143                 if ((ep->ex_flag & EX_LINKED) == 0) {
1144                         ep2 = exphead;
1145                         epp = &exphead;
1146
1147                         /*
1148                          * Insert in the list in alphabetical order.
1149                          */
1150                         while (ep2 && strcmp(ep2->ex_fsdir, ep->ex_fsdir) < 0) {
1151                                 epp = &ep2->ex_next;
1152                                 ep2 = ep2->ex_next;
1153                         }
1154                         if (ep2)
1155                                 ep->ex_next = ep2;
1156                         *epp = ep;
1157                         ep->ex_flag |= EX_LINKED;
1158                 }
1159 nextline:
1160                 if (dirhead) {
1161                         free_dir(dirhead);
1162                         dirhead = NULL;
1163                 }
1164         }
1165         fclose(exp_file);
1166 }
1167
1168 /*
1169  * Allocate an export list element
1170  */
1171 struct exportlist *
1172 get_exp(void)
1173 {
1174         struct exportlist *ep;
1175
1176         ep = (struct exportlist *)malloc(sizeof (struct exportlist));
1177         if (ep == NULL)
1178                 out_of_mem();
1179         memset(ep, 0, sizeof(struct exportlist));
1180         return (ep);
1181 }
1182
1183 /*
1184  * Allocate a group list element
1185  */
1186 struct grouplist *
1187 get_grp(void)
1188 {
1189         struct grouplist *gp;
1190
1191         gp = (struct grouplist *)malloc(sizeof (struct grouplist));
1192         if (gp == NULL)
1193                 out_of_mem();
1194         memset(gp, 0, sizeof(struct grouplist));
1195         return (gp);
1196 }
1197
1198 /*
1199  * Clean up upon an error in get_exportlist().
1200  */
1201 void
1202 getexp_err(struct exportlist *ep, struct grouplist *grp)
1203 {
1204         struct grouplist *tgrp;
1205
1206         if (!(opt_flags & OP_QUIET))
1207                 syslog(LOG_ERR, "bad exports list line %s", line);
1208         if (ep && (ep->ex_flag & EX_LINKED) == 0)
1209                 free_exp(ep);
1210         while (grp) {
1211                 tgrp = grp;
1212                 grp = grp->gr_next;
1213                 free_grp(tgrp);
1214         }
1215 }
1216
1217 /*
1218  * Search the export list for a matching fs.
1219  */
1220 struct exportlist *
1221 ex_search(fsid_t *fsid)
1222 {
1223         struct exportlist *ep;
1224
1225         ep = exphead;
1226         while (ep) {
1227                 if (ep->ex_fs.val[0] == fsid->val[0] &&
1228                     ep->ex_fs.val[1] == fsid->val[1])
1229                         return (ep);
1230                 ep = ep->ex_next;
1231         }
1232         return (ep);
1233 }
1234
1235 /*
1236  * Add a directory path to the list.
1237  */
1238 char *
1239 add_expdir(struct dirlist **dpp, char *cp, int len)
1240 {
1241         struct dirlist *dp;
1242
1243         dp = (struct dirlist *)malloc(sizeof (struct dirlist) + len);
1244         if (dp == NULL)
1245                 out_of_mem();
1246         dp->dp_left = *dpp;
1247         dp->dp_right = NULL;
1248         dp->dp_flag = 0;
1249         dp->dp_hosts = NULL;
1250         strcpy(dp->dp_dirp, cp);
1251         *dpp = dp;
1252         return (dp->dp_dirp);
1253 }
1254
1255 /*
1256  * Hang the dir list element off the dirpath binary tree as required
1257  * and update the entry for host.
1258  */
1259 void
1260 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep,
1261           int flags)
1262 {
1263         struct hostlist *hp;
1264         struct dirlist *dp2;
1265
1266         if (flags & OP_ALLDIRS) {
1267                 if (ep->ex_defdir)
1268                         free((caddr_t)dp);
1269                 else
1270                         ep->ex_defdir = dp;
1271                 if (grp == NULL) {
1272                         ep->ex_defdir->dp_flag |= DP_DEFSET;
1273                         if (flags & OP_KERB)
1274                                 ep->ex_defdir->dp_flag |= DP_KERB;
1275                 } else while (grp) {
1276                         hp = get_ht();
1277                         if (flags & OP_KERB)
1278                                 hp->ht_flag |= DP_KERB;
1279                         hp->ht_grp = grp;
1280                         hp->ht_next = ep->ex_defdir->dp_hosts;
1281                         ep->ex_defdir->dp_hosts = hp;
1282                         grp = grp->gr_next;
1283                 }
1284         } else {
1285
1286                 /*
1287                  * Loop through the directories adding them to the tree.
1288                  */
1289                 while (dp) {
1290                         dp2 = dp->dp_left;
1291                         add_dlist(&ep->ex_dirl, dp, grp, flags);
1292                         dp = dp2;
1293                 }
1294         }
1295 }
1296
1297 /*
1298  * Traverse the binary tree either updating a node that is already there
1299  * for the new directory or adding the new node.
1300  */
1301 void
1302 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp,
1303           int flags)
1304 {
1305         struct dirlist *dp;
1306         struct hostlist *hp;
1307         int cmp;
1308
1309         dp = *dpp;
1310         if (dp) {
1311                 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp);
1312                 if (cmp > 0) {
1313                         add_dlist(&dp->dp_left, newdp, grp, flags);
1314                         return;
1315                 } else if (cmp < 0) {
1316                         add_dlist(&dp->dp_right, newdp, grp, flags);
1317                         return;
1318                 } else
1319                         free((caddr_t)newdp);
1320         } else {
1321                 dp = newdp;
1322                 dp->dp_left = NULL;
1323                 *dpp = dp;
1324         }
1325         if (grp) {
1326
1327                 /*
1328                  * Hang all of the host(s) off of the directory point.
1329                  */
1330                 do {
1331                         hp = get_ht();
1332                         if (flags & OP_KERB)
1333                                 hp->ht_flag |= DP_KERB;
1334                         hp->ht_grp = grp;
1335                         hp->ht_next = dp->dp_hosts;
1336                         dp->dp_hosts = hp;
1337                         grp = grp->gr_next;
1338                 } while (grp);
1339         } else {
1340                 dp->dp_flag |= DP_DEFSET;
1341                 if (flags & OP_KERB)
1342                         dp->dp_flag |= DP_KERB;
1343         }
1344 }
1345
1346 /*
1347  * Search for a dirpath on the export point.
1348  */
1349 struct dirlist *
1350 dirp_search(struct dirlist *dp, char *dirp)
1351 {
1352         int cmp;
1353
1354         if (dp) {
1355                 cmp = strcmp(dp->dp_dirp, dirp);
1356                 if (cmp > 0)
1357                         return (dirp_search(dp->dp_left, dirp));
1358                 else if (cmp < 0)
1359                         return (dirp_search(dp->dp_right, dirp));
1360                 else
1361                         return (dp);
1362         }
1363         return (dp);
1364 }
1365
1366 /*
1367  * Some helper functions for netmasks. They all assume masks in network
1368  * order (big endian).
1369  */
1370 static int
1371 bitcmp(void *dst, void *src, int bitlen)
1372 {
1373         int i;
1374         u_int8_t *p1 = dst, *p2 = src;
1375         u_int8_t bitmask;
1376         int bytelen, bitsleft;
1377
1378         bytelen = bitlen / 8;
1379         bitsleft = bitlen % 8;
1380
1381         if (debug) {
1382                 printf("comparing:\n");
1383                 for (i = 0; i < (bitsleft ? bytelen + 1 : bytelen); i++)
1384                         printf("%02x", p1[i]);
1385                 printf("\n");
1386                 for (i = 0; i < (bitsleft ? bytelen + 1 : bytelen); i++)
1387                         printf("%02x", p2[i]);
1388                 printf("\n");
1389         }
1390
1391         for (i = 0; i < bytelen; i++) {
1392                 if (*p1 != *p2)
1393                         return 1;
1394                 p1++;
1395                 p2++;
1396         }
1397
1398         for (i = 0; i < bitsleft; i++) {
1399                 bitmask = 1 << (7 - i);
1400                 if ((*p1 & bitmask) != (*p2 & bitmask))
1401                         return 1;
1402         }
1403
1404         return 0;
1405 }
1406
1407 /*
1408  * Scan for a host match in a directory tree.
1409  */
1410 int
1411 chk_host(struct dirlist *dp, struct sockaddr *saddr, int *defsetp,
1412          int *hostsetp)
1413 {
1414         struct hostlist *hp;
1415         struct grouplist *grp;
1416         struct addrinfo *ai;
1417
1418         if (dp) {
1419                 if (dp->dp_flag & DP_DEFSET)
1420                         *defsetp = dp->dp_flag;
1421                 hp = dp->dp_hosts;
1422                 while (hp) {
1423                         grp = hp->ht_grp;
1424                         switch (grp->gr_type) {
1425                         case GT_HOST:
1426                                 ai = grp->gr_ptr.gt_addrinfo;
1427                                 for (; ai; ai = ai->ai_next) {
1428                                         if (!sacmp(ai->ai_addr, saddr)) {
1429                                                 *hostsetp =
1430                                                     (hp->ht_flag | DP_HOSTSET);
1431                                                 return (1);
1432                                         }
1433                                 }
1434                             break;
1435                         case GT_NET:
1436                                 if (!netpartcmp(saddr,
1437                                     (struct sockaddr *) &grp->gr_ptr.gt_net.nt_net,
1438                                      grp->gr_ptr.gt_net.nt_mask)) {
1439                                         *hostsetp = (hp->ht_flag | DP_HOSTSET);
1440                                         return (1);
1441                                 }
1442                             break;
1443                         };
1444                         hp = hp->ht_next;
1445                 }
1446         }
1447         return (0);
1448 }
1449
1450 /*
1451  * Scan tree for a host that matches the address.
1452  */
1453 int
1454 scan_tree(struct dirlist *dp, struct sockaddr *saddr)
1455 {
1456         int defset, hostset;
1457
1458         if (dp) {
1459                 if (scan_tree(dp->dp_left, saddr))
1460                         return (1);
1461                 if (chk_host(dp, saddr, &defset, &hostset))
1462                         return (1);
1463                 if (scan_tree(dp->dp_right, saddr))
1464                         return (1);
1465         }
1466         return (0);
1467 }
1468
1469 /*
1470  * Traverse the dirlist tree and free it up.
1471  */
1472 void
1473 free_dir(struct dirlist *dp)
1474 {
1475
1476         if (dp) {
1477                 free_dir(dp->dp_left);
1478                 free_dir(dp->dp_right);
1479                 free_host(dp->dp_hosts);
1480                 free((caddr_t)dp);
1481         }
1482 }
1483
1484 /*
1485  * Parse the option string and update fields.
1486  * Option arguments may either be -<option>=<value> or
1487  * -<option> <value>
1488  */
1489 int
1490 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp,
1491        int *has_hostp, int *exflagsp, struct ucred *cr)
1492 {
1493         char *cpoptarg, *cpoptend;
1494         char *cp, *endcp, *cpopt, savedc, savedc2;
1495         int allflag, usedarg;
1496
1497         savedc2 = '\0';
1498         cpopt = *cpp;
1499         cpopt++;
1500         cp = *endcpp;
1501         savedc = *cp;
1502         *cp = '\0';
1503         while (cpopt && *cpopt) {
1504                 allflag = 1;
1505                 usedarg = -2;
1506                 if ((cpoptend = strchr(cpopt, ','))) {
1507                         *cpoptend++ = '\0';
1508                         if ((cpoptarg = strchr(cpopt, '=')))
1509                                 *cpoptarg++ = '\0';
1510                 } else {
1511                         if ((cpoptarg = strchr(cpopt, '=')))
1512                                 *cpoptarg++ = '\0';
1513                         else {
1514                                 *cp = savedc;
1515                                 nextfield(&cp, &endcp);
1516                                 **endcpp = '\0';
1517                                 if (endcp > cp && *cp != '-') {
1518                                         cpoptarg = cp;
1519                                         savedc2 = *endcp;
1520                                         *endcp = '\0';
1521                                         usedarg = 0;
1522                                 }
1523                         }
1524                 }
1525                 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) {
1526                         *exflagsp |= MNT_EXRDONLY;
1527                 } else if (cpoptarg && (!strcmp(cpopt, "maproot") ||
1528                     !(allflag = strcmp(cpopt, "mapall")) ||
1529                     !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) {
1530                         usedarg++;
1531                         parsecred(cpoptarg, cr);
1532                         if (allflag == 0) {
1533                                 *exflagsp |= MNT_EXPORTANON;
1534                                 opt_flags |= OP_MAPALL;
1535                         } else
1536                                 opt_flags |= OP_MAPROOT;
1537                 } else if (!strcmp(cpopt, "kerb") || !strcmp(cpopt, "k")) {
1538                         *exflagsp |= MNT_EXKERB;
1539                         opt_flags |= OP_KERB;
1540                 } else if (cpoptarg && (!strcmp(cpopt, "mask") ||
1541                         !strcmp(cpopt, "m"))) {
1542                         if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) {
1543                                 syslog(LOG_ERR, "bad mask: %s", cpoptarg);
1544                                 return (1);
1545                         }
1546                         usedarg++;
1547                         opt_flags |= OP_MASK;
1548                 } else if (cpoptarg && (!strcmp(cpopt, "network") ||
1549                         !strcmp(cpopt, "n"))) {
1550                         if (strchr(cpoptarg, '/') != NULL) {
1551                                 if (debug)
1552                                         fprintf(stderr, "setting OP_MASKLEN\n");
1553                                 opt_flags |= OP_MASKLEN;
1554                         }
1555                         if (grp->gr_type != GT_NULL) {
1556                                 syslog(LOG_ERR, "network/host conflict");
1557                                 return (1);
1558                         } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) {
1559                                 syslog(LOG_ERR, "bad net: %s", cpoptarg);
1560                                 return (1);
1561                         }
1562                         grp->gr_type = GT_NET;
1563                         *has_hostp = 1;
1564                         usedarg++;
1565                         opt_flags |= OP_NET;
1566                 } else if (!strcmp(cpopt, "alldirs")) {
1567                         opt_flags |= OP_ALLDIRS;
1568                 } else if (!strcmp(cpopt, "public")) {
1569                         *exflagsp |= MNT_EXPUBLIC;
1570                 } else if (!strcmp(cpopt, "webnfs")) {
1571                         *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON);
1572                         opt_flags |= OP_MAPALL;
1573                 } else if (cpoptarg && !strcmp(cpopt, "index")) {
1574                         ep->ex_indexfile = strdup(cpoptarg);
1575                 } else if (!strcmp(cpopt, "quiet")) {
1576                         opt_flags |= OP_QUIET;
1577                 } else {
1578                         syslog(LOG_ERR, "bad opt %s", cpopt);
1579                         return (1);
1580                 }
1581                 if (usedarg >= 0) {
1582                         *endcp = savedc2;
1583                         **endcpp = savedc;
1584                         if (usedarg > 0) {
1585                                 *cpp = cp;
1586                                 *endcpp = endcp;
1587                         }
1588                         return (0);
1589                 }
1590                 cpopt = cpoptend;
1591         }
1592         **endcpp = savedc;
1593         return (0);
1594 }
1595
1596 /*
1597  * Translate a character string to the corresponding list of network
1598  * addresses for a hostname.
1599  */
1600 int
1601 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp)
1602 {
1603         struct grouplist *checkgrp;
1604         struct addrinfo *ai, *tai, hints;
1605         int ecode;
1606         char host[NI_MAXHOST];
1607
1608         if (grp->gr_type != GT_NULL) {
1609                 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp);
1610                 return (1);
1611         }
1612         memset(&hints, 0, sizeof hints);
1613         hints.ai_flags = AI_CANONNAME;
1614         hints.ai_protocol = IPPROTO_UDP;
1615         ecode = getaddrinfo(cp, NULL, &hints, &ai);
1616         if (ecode != 0) {
1617                 syslog(LOG_ERR,"can't get address info for host %s", cp);
1618                 return 1;
1619         }
1620         grp->gr_ptr.gt_addrinfo = ai;
1621         while (ai != NULL) {
1622                 if (ai->ai_canonname == NULL) {
1623                         if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host,
1624                             sizeof host, NULL, 0, ninumeric) != 0)
1625                                 strlcpy(host, "?", sizeof(host));
1626                         ai->ai_canonname = strdup(host);
1627                         ai->ai_flags |= AI_CANONNAME;
1628                 }
1629                 if (debug)
1630                         fprintf(stderr, "got host %s\n", ai->ai_canonname);
1631                 /*
1632                  * Sanity check: make sure we don't already have an entry
1633                  * for this host in the grouplist.
1634                  */
1635                 for (checkgrp = tgrp; checkgrp != NULL;
1636                     checkgrp = checkgrp->gr_next) {
1637                         if (checkgrp->gr_type != GT_HOST)
1638                                 continue;
1639                         for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL;
1640                             tai = tai->ai_next) {
1641                                 if (sacmp(tai->ai_addr, ai->ai_addr) != 0)
1642                                         continue;
1643                                 if (debug)
1644                                         fprintf(stderr,
1645                                             "ignoring duplicate host %s\n",
1646                                             ai->ai_canonname);
1647                                 grp->gr_type = GT_IGNORE;
1648                                 return (0);
1649                         }
1650                 }
1651                 ai = ai->ai_next;
1652         }
1653         grp->gr_type = GT_HOST;
1654         return (0);
1655 }
1656
1657 /*
1658  * Free up an exports list component
1659  */
1660 void
1661 free_exp(struct exportlist *ep)
1662 {
1663
1664         if (ep->ex_defdir) {
1665                 free_host(ep->ex_defdir->dp_hosts);
1666                 free((caddr_t)ep->ex_defdir);
1667         }
1668         if (ep->ex_fsdir)
1669                 free(ep->ex_fsdir);
1670         if (ep->ex_indexfile)
1671                 free(ep->ex_indexfile);
1672         free_dir(ep->ex_dirl);
1673         free((caddr_t)ep);
1674 }
1675
1676 /*
1677  * Free hosts.
1678  */
1679 void
1680 free_host(struct hostlist *hp)
1681 {
1682         struct hostlist *hp2;
1683
1684         while (hp) {
1685                 hp2 = hp;
1686                 hp = hp->ht_next;
1687                 free((caddr_t)hp2);
1688         }
1689 }
1690
1691 struct hostlist *
1692 get_ht(void)
1693 {
1694         struct hostlist *hp;
1695
1696         hp = (struct hostlist *)malloc(sizeof (struct hostlist));
1697         if (hp == NULL)
1698                 out_of_mem();
1699         hp->ht_next = NULL;
1700         hp->ht_flag = 0;
1701         return (hp);
1702 }
1703
1704 /*
1705  * Out of memory, fatal
1706  */
1707 void
1708 out_of_mem(void)
1709 {
1710
1711         syslog(LOG_ERR, "out of memory");
1712         exit(2);
1713 }
1714
1715 /*
1716  * Do the mount syscall with the update flag to push the export info into
1717  * the kernel.
1718  */
1719 int
1720 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags,
1721          struct ucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb)
1722 {
1723         struct statfs fsb1;
1724         struct sockaddr_storage ss;
1725         struct addrinfo *ai;
1726         char *cp = NULL;
1727         int done;
1728         char savedc = '\0';
1729         union {
1730                 struct ufs_args ua;
1731                 struct iso_args ia;
1732                 struct mfs_args ma;
1733 #ifdef __NetBSD__
1734                 struct msdosfs_args da;
1735                 struct adosfs_args aa;
1736 #endif
1737                 struct ntfs_args na;
1738         } args;
1739
1740         args.ua.fspec = 0;
1741         args.ua.export.ex_flags = exflags;
1742         args.ua.export.ex_anon = *anoncrp;
1743         args.ua.export.ex_indexfile = ep->ex_indexfile;
1744         if (grp->gr_type == GT_HOST)
1745                 ai = grp->gr_ptr.gt_addrinfo;
1746         else
1747                 ai = NULL;
1748         done = FALSE;
1749         while (!done) {
1750                 switch (grp->gr_type) {
1751                 case GT_HOST:
1752                         if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0)
1753                                 goto skip;
1754                         args.ua.export.ex_addr = ai->ai_addr;
1755                         args.ua.export.ex_addrlen = ai->ai_addrlen;
1756                         args.ua.export.ex_masklen = 0;
1757                         break;
1758                 case GT_NET:
1759                         args.ua.export.ex_addr = (struct sockaddr *)
1760                             &grp->gr_ptr.gt_net.nt_net;
1761                         if (args.ua.export.ex_addr->sa_family == AF_INET6 &&
1762                             have_v6 == 0)
1763                                 goto skip;
1764                         args.ua.export.ex_addrlen =
1765                             args.ua.export.ex_addr->sa_len;
1766                         memset(&ss, 0, sizeof ss);
1767                         ss.ss_family = args.ua.export.ex_addr->sa_family;
1768                         ss.ss_len = args.ua.export.ex_addr->sa_len;
1769                         if (allones(&ss, grp->gr_ptr.gt_net.nt_mask) != 0) {
1770                                 syslog(LOG_ERR, "Bad network flag");
1771                                 if (cp)
1772                                         *cp = savedc;
1773                                 return (1);
1774                         }
1775                         args.ua.export.ex_mask = (struct sockaddr *)&ss;
1776                         args.ua.export.ex_masklen = ss.ss_len;
1777                         break;
1778                 case GT_DEFAULT:
1779                         args.ua.export.ex_addr = NULL;
1780                         args.ua.export.ex_addrlen = 0;
1781                         args.ua.export.ex_mask = NULL;
1782                         args.ua.export.ex_masklen = 0;
1783                         break;
1784                 case GT_IGNORE:
1785                         return(0);
1786                         break;
1787                 default:
1788                         syslog(LOG_ERR, "bad grouptype");
1789                         if (cp)
1790                                 *cp = savedc;
1791                         return (1);
1792                 };
1793
1794                 /*
1795                  * XXX:
1796                  * Maybe I should just use the fsb->f_mntonname path instead
1797                  * of looping back up the dirp to the mount point??
1798                  * Also, needs to know how to export all types of local
1799                  * exportable file systems and not just "ufs".
1800                  */
1801                 for (;;) {
1802                         int r;
1803
1804                         r = mountctl(fsb->f_mntonname, MOUNTCTL_SET_EXPORT,
1805                                      -1,
1806                                      &args.ua.export, sizeof(args.ua.export),
1807                                      NULL, 0);
1808                         if (r < 0 && errno == EOPNOTSUPP) {
1809                                 r = mount(fsb->f_fstypename, dirp,
1810                                           fsb->f_flags | MNT_UPDATE,
1811                                           (caddr_t)&args);
1812                         }
1813                         if (r >= 0)
1814                                 break;
1815                         if (cp)
1816                                 *cp-- = savedc;
1817                         else
1818                                 cp = dirp + dirplen - 1;
1819                         if (opt_flags & OP_QUIET)
1820                                 return (1);
1821                         if (errno == EPERM) {
1822                                 if (debug)
1823                                         warnx("can't change attributes for %s",
1824                                             dirp);
1825                                 syslog(LOG_ERR,
1826                                    "can't change attributes for %s", dirp);
1827                                 return (1);
1828                         }
1829                         if (opt_flags & OP_ALLDIRS) {
1830                                 if (errno == EINVAL)
1831                                         syslog(LOG_ERR,
1832                 "-alldirs requested but %s is not a filesystem mountpoint",
1833                                                 dirp);
1834                                 else
1835                                         syslog(LOG_ERR,
1836                                                 "could not remount %s: %m",
1837                                                 dirp);
1838                                 return (1);
1839                         }
1840                         /* back up over the last component */
1841                         while (*cp == '/' && cp > dirp)
1842                                 cp--;
1843                         while (*(cp - 1) != '/' && cp > dirp)
1844                                 cp--;
1845                         if (cp == dirp) {
1846                                 if (debug)
1847                                         warnx("mnt unsucc");
1848                                 syslog(LOG_ERR, "can't export %s", dirp);
1849                                 return (1);
1850                         }
1851                         savedc = *cp;
1852                         *cp = '\0';
1853                         /* Check that we're still on the same filesystem. */
1854                         if (statfs(dirp, &fsb1) != 0 || bcmp(&fsb1.f_fsid,
1855                             &fsb->f_fsid, sizeof(fsb1.f_fsid)) != 0) {
1856                                 *cp = savedc;
1857                                 syslog(LOG_ERR, "can't export %s", dirp);
1858                                 return (1);
1859                         }
1860                 }
1861 skip:
1862                 if (ai != NULL)
1863                         ai = ai->ai_next;
1864                 if (ai == NULL)
1865                         done = TRUE;
1866         }
1867         if (cp)
1868                 *cp = savedc;
1869         return (0);
1870 }
1871
1872 /*
1873  * Translate a net address.
1874  */
1875 int
1876 get_net(char *cp, struct netmsk *net, int maskflg)
1877 {
1878         struct netent *np;
1879         char *name, *p, *prefp;
1880         struct sockaddr_in sin, *sinp;
1881         struct sockaddr *sa;
1882         struct addrinfo hints, *ai = NULL;
1883         char netname[NI_MAXHOST];
1884         long preflen;
1885         int ecode;
1886
1887         p = prefp = NULL;
1888         if ((opt_flags & OP_MASKLEN) && !maskflg) {
1889                 p = strchr(cp, '/');
1890                 *p = '\0';
1891                 prefp = p + 1;
1892         }
1893
1894         if ((np = getnetbyname(cp)) != NULL) {
1895                 sin.sin_family = AF_INET;
1896                 sin.sin_len = sizeof sin;
1897                 sin.sin_addr = inet_makeaddr(np->n_net, 0);
1898                 sa = (struct sockaddr *)&sin;
1899         } else if (isdigit(*cp)) {
1900                 memset(&hints, 0, sizeof hints);
1901                 hints.ai_family = AF_UNSPEC;
1902                 hints.ai_flags = AI_NUMERICHOST;
1903                 if (getaddrinfo(cp, NULL, &hints, &ai) != 0) {
1904                         /*
1905                          * If getaddrinfo() failed, try the inet4 network
1906                          * notation with less than 3 dots.
1907                          */
1908                         sin.sin_family = AF_INET;
1909                         sin.sin_len = sizeof sin;
1910                         sin.sin_addr = inet_makeaddr(inet_network(cp),0);
1911                         if (debug)
1912                                 fprintf(stderr, "get_net: v4 addr %x\n",
1913                                     sin.sin_addr.s_addr);
1914                         sa = (struct sockaddr *)&sin;
1915                 } else
1916                         sa = ai->ai_addr;
1917         } else if (isxdigit(*cp) || *cp == ':') {
1918                 memset(&hints, 0, sizeof hints);
1919                 hints.ai_family = AF_UNSPEC;
1920                 hints.ai_flags = AI_NUMERICHOST;
1921                 if (getaddrinfo(cp, NULL, &hints, &ai) == 0)
1922                         sa = ai->ai_addr;
1923                 else
1924                         goto fail;
1925         } else
1926                 goto fail;
1927
1928         ecode = getnameinfo(sa, sa->sa_len, netname, sizeof netname,
1929             NULL, 0, ninumeric);
1930         if (ecode != 0)
1931                 goto fail;
1932
1933         if (maskflg)
1934                 net->nt_mask = countones(sa);
1935         else {
1936                 if (opt_flags & OP_MASKLEN) {
1937                         preflen = strtol(prefp, NULL, 10);
1938                         if (preflen == LONG_MIN && errno == ERANGE)
1939                                 goto fail;
1940                         net->nt_mask = (int)preflen;
1941                         *p = '/';
1942                 }
1943
1944                 if (np)
1945                         name = np->n_name;
1946                 else {
1947                         if (getnameinfo(sa, sa->sa_len, netname, sizeof netname,
1948                            NULL, 0, ninumeric) != 0)
1949                                 strlcpy(netname, "?", sizeof(netname));
1950                         name = netname;
1951                 }
1952                 net->nt_name = strdup(name);
1953                 memcpy(&net->nt_net, sa, sa->sa_len);
1954         }
1955
1956         if (!maskflg && sa->sa_family == AF_INET &&
1957             !(opt_flags & (OP_MASK|OP_MASKLEN))) {
1958                 sinp = (struct sockaddr_in *)sa;
1959                 if (IN_CLASSA(sinp->sin_addr.s_addr))
1960                         net->nt_mask = 8;
1961                 else if (IN_CLASSB(sinp->sin_addr.s_addr))
1962                         net->nt_mask = 16;
1963                 else if (IN_CLASSC(sinp->sin_addr.s_addr))
1964                         net->nt_mask = 24;
1965                 else if (IN_CLASSD(sinp->sin_addr.s_addr))
1966                         net->nt_mask = 28;
1967                 else
1968                         net->nt_mask = 32;       /* XXX */
1969         }
1970
1971         if (ai)
1972                 freeaddrinfo(ai);
1973         return 0;
1974
1975 fail:
1976         if (ai)
1977                 freeaddrinfo(ai);
1978         return 1;
1979 }
1980
1981 /*
1982  * Parse out the next white space separated field
1983  */
1984 void
1985 nextfield(char **cp, char **endcp)
1986 {
1987         char *p;
1988
1989         p = *cp;
1990         while (*p == ' ' || *p == '\t')
1991                 p++;
1992         if (*p == '\n' || *p == '\0')
1993                 *cp = *endcp = p;
1994         else {
1995                 *cp = p++;
1996                 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
1997                         p++;
1998                 *endcp = p;
1999         }
2000 }
2001
2002 /*
2003  * Get an exports file line. Skip over blank lines and handle line
2004  * continuations.
2005  */
2006 int
2007 get_line(void)
2008 {
2009         char *p, *cp;
2010         int len;
2011         int totlen, cont_line;
2012
2013         /*
2014          * Loop around ignoring blank lines and getting all continuation lines.
2015          */
2016         p = line;
2017         totlen = 0;
2018         do {
2019                 if (fgets(p, LINESIZ - totlen, exp_file) == NULL)
2020                         return (0);
2021                 len = strlen(p);
2022                 cp = p + len - 1;
2023                 cont_line = 0;
2024                 while (cp >= p &&
2025                     (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) {
2026                         if (*cp == '\\')
2027                                 cont_line = 1;
2028                         cp--;
2029                         len--;
2030                 }
2031                 if (cont_line) {
2032                         *++cp = ' ';
2033                         len++;
2034                 }
2035                 *++cp = '\0';
2036                 if (len > 0) {
2037                         totlen += len;
2038                         if (totlen >= LINESIZ) {
2039                                 syslog(LOG_ERR, "exports line too long");
2040                                 exit(2);
2041                         }
2042                         p = cp;
2043                 }
2044         } while (totlen == 0 || cont_line);
2045         return (1);
2046 }
2047
2048 /*
2049  * Parse a description of a credential.
2050  */
2051 void
2052 parsecred(char *namelist, struct ucred *cr)
2053 {
2054         char *name;
2055         int cnt;
2056         char *names;
2057         struct passwd *pw;
2058         struct group *gr;
2059         int ngroups, groups[NGROUPS + 1];
2060
2061         /*
2062          * Set up the unprivileged user.
2063          */
2064         cr->cr_ref = 1;
2065         cr->cr_uid = -2;
2066         cr->cr_groups[0] = -2;
2067         cr->cr_ngroups = 1;
2068         /*
2069          * Get the user's password table entry.
2070          */
2071         names = strsep(&namelist, " \t\n");
2072         name = strsep(&names, ":");
2073         if (isdigit(*name) || *name == '-')
2074                 pw = getpwuid(atoi(name));
2075         else
2076                 pw = getpwnam(name);
2077         /*
2078          * Credentials specified as those of a user.
2079          */
2080         if (names == NULL) {
2081                 if (pw == NULL) {
2082                         syslog(LOG_ERR, "unknown user: %s", name);
2083                         return;
2084                 }
2085                 cr->cr_uid = pw->pw_uid;
2086                 ngroups = NGROUPS + 1;
2087                 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups))
2088                         syslog(LOG_ERR, "too many groups");
2089                 /*
2090                  * Convert from int's to gid_t's and compress out duplicate
2091                  */
2092                 cr->cr_ngroups = ngroups - 1;
2093                 cr->cr_groups[0] = groups[0];
2094                 for (cnt = 2; cnt < ngroups; cnt++)
2095                         cr->cr_groups[cnt - 1] = groups[cnt];
2096                 return;
2097         }
2098         /*
2099          * Explicit credential specified as a colon separated list:
2100          *      uid:gid:gid:...
2101          */
2102         if (pw != NULL)
2103                 cr->cr_uid = pw->pw_uid;
2104         else if (isdigit(*name) || *name == '-')
2105                 cr->cr_uid = atoi(name);
2106         else {
2107                 syslog(LOG_ERR, "unknown user: %s", name);
2108                 return;
2109         }
2110         cr->cr_ngroups = 0;
2111         while (names != NULL && *names != '\0' && cr->cr_ngroups < NGROUPS) {
2112                 name = strsep(&names, ":");
2113                 if (isdigit(*name) || *name == '-') {
2114                         cr->cr_groups[cr->cr_ngroups++] = atoi(name);
2115                 } else {
2116                         if ((gr = getgrnam(name)) == NULL) {
2117                                 syslog(LOG_ERR, "unknown group: %s", name);
2118                                 continue;
2119                         }
2120                         cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid;
2121                 }
2122         }
2123         if (names != NULL && *names != '\0' && cr->cr_ngroups == NGROUPS)
2124                 syslog(LOG_ERR, "too many groups");
2125 }
2126
2127 #define STRSIZ  (RPCMNT_NAMELEN+RPCMNT_PATHLEN+50)
2128 /*
2129  * Routines that maintain the remote mounttab
2130  */
2131 void
2132 get_mountlist(void)
2133 {
2134         struct mountlist *mlp, **mlpp;
2135         char *host, *dirp, *cp;
2136         char str[STRSIZ];
2137         FILE *mlfile;
2138
2139         if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) {
2140                 if (errno == ENOENT)
2141                         return;
2142                 else {
2143                         syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST);
2144                         return;
2145                 }
2146         }
2147         mlpp = &mlhead;
2148         while (fgets(str, STRSIZ, mlfile) != NULL) {
2149                 cp = str;
2150                 host = strsep(&cp, " \t\n");
2151                 dirp = strsep(&cp, " \t\n");
2152                 if (host == NULL || dirp == NULL)
2153                         continue;
2154                 mlp = (struct mountlist *)malloc(sizeof (*mlp));
2155                 if (mlp == NULL)
2156                         out_of_mem();
2157                 strncpy(mlp->ml_host, host, RPCMNT_NAMELEN);
2158                 mlp->ml_host[RPCMNT_NAMELEN] = '\0';
2159                 strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN);
2160                 mlp->ml_dirp[RPCMNT_PATHLEN] = '\0';
2161                 mlp->ml_next = NULL;
2162                 *mlpp = mlp;
2163                 mlpp = &mlp->ml_next;
2164         }
2165         fclose(mlfile);
2166 }
2167
2168 void
2169 del_mlist(char *hostp, char *dirp)
2170 {
2171         struct mountlist *mlp, **mlpp;
2172         struct mountlist *mlp2;
2173         FILE *mlfile;
2174         int fnd = 0;
2175
2176         mlpp = &mlhead;
2177         mlp = mlhead;
2178         while (mlp) {
2179                 if (!strcmp(mlp->ml_host, hostp) &&
2180                     (!dirp || !strcmp(mlp->ml_dirp, dirp))) {
2181                         fnd = 1;
2182                         mlp2 = mlp;
2183                         *mlpp = mlp = mlp->ml_next;
2184                         free((caddr_t)mlp2);
2185                 } else {
2186                         mlpp = &mlp->ml_next;
2187                         mlp = mlp->ml_next;
2188                 }
2189         }
2190         if (fnd) {
2191                 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) {
2192                         syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST);
2193                         return;
2194                 }
2195                 mlp = mlhead;
2196                 while (mlp) {
2197                         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
2198                         mlp = mlp->ml_next;
2199                 }
2200                 fclose(mlfile);
2201         }
2202 }
2203
2204 void
2205 add_mlist(char *hostp, char *dirp)
2206 {
2207         struct mountlist *mlp, **mlpp;
2208         FILE *mlfile;
2209
2210         mlpp = &mlhead;
2211         mlp = mlhead;
2212         while (mlp) {
2213                 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp))
2214                         return;
2215                 mlpp = &mlp->ml_next;
2216                 mlp = mlp->ml_next;
2217         }
2218         mlp = (struct mountlist *)malloc(sizeof (*mlp));
2219         if (mlp == NULL)
2220                 out_of_mem();
2221         strncpy(mlp->ml_host, hostp, RPCMNT_NAMELEN);
2222         mlp->ml_host[RPCMNT_NAMELEN] = '\0';
2223         strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN);
2224         mlp->ml_dirp[RPCMNT_PATHLEN] = '\0';
2225         mlp->ml_next = NULL;
2226         *mlpp = mlp;
2227         if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
2228                 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST);
2229                 return;
2230         }
2231         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
2232         fclose(mlfile);
2233 }
2234
2235 /*
2236  * Free up a group list.
2237  */
2238 void
2239 free_grp(struct grouplist *grp)
2240 {
2241         if (grp->gr_type == GT_HOST) {
2242                 if (grp->gr_ptr.gt_addrinfo != NULL)
2243                         freeaddrinfo(grp->gr_ptr.gt_addrinfo);
2244         } else if (grp->gr_type == GT_NET) {
2245                 if (grp->gr_ptr.gt_net.nt_name)
2246                         free(grp->gr_ptr.gt_net.nt_name);
2247         }
2248         free((caddr_t)grp);
2249 }
2250
2251 #ifdef DEBUG
2252 void
2253 SYSLOG(int pri, const char *fmt, ...)
2254 {
2255         va_list ap;
2256
2257         va_start(ap, fmt);
2258         vfprintf(stderr, fmt, ap);
2259         va_end(ap);
2260 }
2261 #endif /* DEBUG */
2262
2263 /*
2264  * Check options for consistency.
2265  */
2266 int
2267 check_options(struct dirlist *dp)
2268 {
2269
2270         if (dp == NULL)
2271             return (1);
2272         if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL) ||
2273             (opt_flags & (OP_MAPROOT | OP_KERB)) == (OP_MAPROOT | OP_KERB) ||
2274             (opt_flags & (OP_MAPALL | OP_KERB)) == (OP_MAPALL | OP_KERB)) {
2275             syslog(LOG_ERR, "-mapall, -maproot and -kerb mutually exclusive");
2276             return (1);
2277         }
2278         if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) {
2279                 syslog(LOG_ERR, "-mask requires -network");
2280                 return (1);
2281         }
2282         if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
2283             syslog(LOG_ERR, "-alldirs has multiple directories");
2284             return (1);
2285         }
2286         return (0);
2287 }
2288
2289 /*
2290  * Check an absolute directory path for any symbolic links. Return true
2291  */
2292 int
2293 check_dirpath(char *dirp)
2294 {
2295         char *cp;
2296         int ret = 1;
2297         struct stat sb;
2298
2299         cp = dirp + 1;
2300         while (*cp && ret) {
2301                 if (*cp == '/') {
2302                         *cp = '\0';
2303                         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
2304                                 ret = 0;
2305                         *cp = '/';
2306                 }
2307                 cp++;
2308         }
2309         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
2310                 ret = 0;
2311         return (ret);
2312 }
2313
2314 static int
2315 netpartcmp(struct sockaddr *s1, struct sockaddr *s2, int bitlen)
2316 {
2317         void *src, *dst;
2318
2319         if (s1->sa_family != s2->sa_family)
2320                 return 1;
2321
2322         switch (s1->sa_family) {
2323         case AF_INET:
2324                 src = &((struct sockaddr_in *)s1)->sin_addr;
2325                 dst = &((struct sockaddr_in *)s2)->sin_addr;
2326                 if (bitlen > sizeof(((struct sockaddr_in *)s1)->sin_addr) * 8)
2327                         return 1;
2328                 break;
2329         case AF_INET6:
2330                 src = &((struct sockaddr_in6 *)s1)->sin6_addr;
2331                 dst = &((struct sockaddr_in6 *)s2)->sin6_addr;
2332                 if (((struct sockaddr_in6 *)s1)->sin6_scope_id !=
2333                    ((struct sockaddr_in6 *)s2)->sin6_scope_id)
2334                         return 1;
2335                 if (bitlen > sizeof(((struct sockaddr_in6 *)s1)->sin6_addr) * 8)
2336                         return 1;
2337                 break;
2338         default:
2339                 return 1;
2340         }
2341
2342         return bitcmp(src, dst, bitlen);
2343 }
2344
2345 static int
2346 allones(struct sockaddr_storage *ssp, int bitlen)
2347 {
2348         u_int8_t *p;
2349         int bytelen, bitsleft, i;
2350         int zerolen;
2351
2352         switch (ssp->ss_family) {
2353         case AF_INET:
2354                 p = (u_int8_t *)&((struct sockaddr_in *)ssp)->sin_addr;
2355                 zerolen = sizeof (((struct sockaddr_in *)ssp)->sin_addr);
2356                 break;
2357         case AF_INET6:
2358                 p = (u_int8_t *)&((struct sockaddr_in6 *)ssp)->sin6_addr;
2359                 zerolen = sizeof (((struct sockaddr_in6 *)ssp)->sin6_addr);
2360         break;
2361         default:
2362                 return -1;
2363         }
2364
2365         memset(p, 0, zerolen);
2366
2367         bytelen = bitlen / 8;
2368         bitsleft = bitlen % 8;
2369
2370         if (bytelen > zerolen)
2371                 return -1;
2372
2373         for (i = 0; i < bytelen; i++)
2374                 *p++ = 0xff;
2375
2376         for (i = 0; i < bitsleft; i++)
2377                 *p |= 1 << (7 - i);
2378
2379         return 0;
2380 }
2381
2382 static int
2383 countones(struct sockaddr *sa)
2384 {
2385         void *mask;
2386         int i, bits = 0, bytelen;
2387         u_int8_t *p;
2388
2389         switch (sa->sa_family) {
2390         case AF_INET:
2391                 mask = (u_int8_t *)&((struct sockaddr_in *)sa)->sin_addr;
2392                 bytelen = 4;
2393                 break;
2394         case AF_INET6:
2395                 mask = (u_int8_t *)&((struct sockaddr_in6 *)sa)->sin6_addr;
2396                 bytelen = 16;
2397                 break;
2398         default:
2399                 return 0;
2400         }
2401
2402         p = mask;
2403
2404         for (i = 0; i < bytelen; i++, p++) {
2405                 if (*p != 0xff) {
2406                         for (bits = 0; bits < 8; bits++) {
2407                                 if (!(*p & (1 << (7 - bits))))
2408                                         break;
2409                         }
2410                         break;
2411                 }
2412         }
2413
2414         return (i * 8 + bits);
2415 }
2416
2417 static int
2418 sacmp(struct sockaddr *sa1, struct sockaddr *sa2)
2419 {
2420         void *p1, *p2;
2421         int len;
2422
2423         if (sa1->sa_family != sa2->sa_family)
2424                 return 1;
2425
2426         switch (sa1->sa_family) {
2427         case AF_INET:
2428                 p1 = &((struct sockaddr_in *)sa1)->sin_addr;
2429                 p2 = &((struct sockaddr_in *)sa2)->sin_addr;
2430                 len = 4;
2431                 break;
2432         case AF_INET6:
2433                 p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr;
2434                 p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr;
2435                 len = 16;
2436                 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
2437                     ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
2438                         return 1;
2439                 break;
2440         default:
2441                 return 1;
2442         }
2443
2444         return memcmp(p1, p2, len);
2445 }
2446
2447 void
2448 huphandler(int sig)
2449 {
2450         got_sighup = 1;
2451 }
2452
2453 void terminate(sig)
2454 int sig;
2455 {
2456         close(mountdlockfd);
2457         unlink(MOUNTDLOCK);
2458         rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL);
2459         rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL);
2460         exit (0);
2461 }