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. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * @(#) Copyright (c) 1989, 1993 The Regents of the University of California.  All rights reserved.
  33  * @(#)mountd.c 8.15 (Berkeley) 5/1/95
  34  * $FreeBSD: src/sbin/mountd/mountd.c,v 1.39.2.5 2002/09/13 15:57:43 joerg Exp $
  35  */
  36
  37 #include <sys/param.h>
  38 #include <sys/mount.h>
  39 #include <sys/mountctl.h>
  40 #include <sys/fcntl.h>
  41 #include <sys/stat.h>
  42 #include <sys/syslog.h>
  43 #include <sys/sysctl.h>
  44
  45 #include <rpc/rpc.h>
  46 #include <rpc/pmap_clnt.h>
  47 #include <rpc/pmap_prot.h>
  48 #include <rpcsvc/mount.h>
  49 #include <vfs/nfs/rpcv2.h>
  50 #include <vfs/nfs/nfsproto.h>
  51 #include <vfs/nfs/nfs.h>
  52 #include <vfs/ufs/ufsmount.h>
  53 #include <vfs/msdosfs/msdosfsmount.h>
  54 #include <vfs/ntfs/ntfsmount.h>
  55 #include <vfs/isofs/cd9660/cd9660_mount.h>      /* XXX need isofs in include */
  56
  57 #include <arpa/inet.h>
  58
  59 #include <ctype.h>
  60 #include <err.h>
  61 #include <errno.h>
  62 #include <grp.h>
  63 #include <libutil.h>
  64 #include <netdb.h>
  65 #include <pwd.h>
  66 #include <signal.h>
  67 #include <stdio.h>
  68 #include <stdlib.h>
  69 #include <string.h>
  70 #include <unistd.h>
  71 #include "pathnames.h"
  72
  73 #ifdef DEBUG
  74 #include <stdarg.h>
  75 #endif
  76
  77 /*
  78  * Structures for keeping the mount list and export list
  79  */
  80 struct mountlist {
  81         struct mountlist *ml_next;
  82         char    ml_host[RPCMNT_NAMELEN+1];
  83         char    ml_dirp[RPCMNT_PATHLEN+1];
  84 };
  85
  86 struct dirlist {
  87         struct dirlist  *dp_left;
  88         struct dirlist  *dp_right;
  89         int             dp_flag;
  90         struct hostlist *dp_hosts;      /* List of hosts this dir exported to */
  91         char            dp_dirp[1];     /* Actually malloc'd to size of dir */
  92 };
  93 /* dp_flag bits */
  94 #define DP_DEFSET       0x1
  95 #define DP_HOSTSET      0x2
  96 #define DP_KERB         0x4
  97
  98 struct exportlist {
  99         struct exportlist *ex_next;
 100         struct dirlist  *ex_dirl;
 101         struct dirlist  *ex_defdir;
 102         int             ex_flag;
 103         fsid_t          ex_fs;
 104         char            *ex_fsdir;
 105         char            *ex_indexfile;
 106 };
 107 /* ex_flag bits */
 108 #define EX_LINKED       0x1
 109
 110 struct netmsk {
 111         struct sockaddr_storage nt_net;
 112         u_int32_t       nt_mask;
 113         char            *nt_name;
 114 };
 115
 116 union grouptypes {
 117         struct addrinfo *gt_addrinfo;
 118         struct netmsk   gt_net;
 119 };
 120
 121 struct grouplist {
 122         int gr_type;
 123         union grouptypes gr_ptr;
 124         struct grouplist *gr_next;
 125 };
 126 /* Group types */
 127 #define GT_NULL         0x0
 128 #define GT_HOST         0x1
 129 #define GT_NET          0x2
 130 #define GT_DEFAULT      0x3
 131 #define GT_IGNORE       0x5
 132
 133 struct hostlist {
 134         int              ht_flag;       /* Uses DP_xx bits */
 135         struct grouplist *ht_grp;
 136         struct hostlist  *ht_next;
 137 };
 138
 139 struct fhreturn {
 140         int     fhr_flag;
 141         int     fhr_vers;
 142         nfsfh_t fhr_fh;
 143 };
 144
 145 /* Global defs */
 146 char    *add_expdir(struct dirlist **, char *, int);
 147 void    add_dlist(struct dirlist **, struct dirlist *,
 148                                 struct grouplist *, int);
 149 void    add_mlist(char *, char *);
 150 int     check_dirpath(char *);
 151 int     check_options(struct dirlist *);
 152 int     chk_host(struct dirlist *, struct sockaddr *, int *, int *);
 153 void    del_mlist(char *, char *);
 154 struct dirlist *dirp_search(struct dirlist *, char *);
 155 int     do_mount(struct exportlist *, struct grouplist *, int,
 156                 struct ucred *, char *, int, struct statfs *);
 157 int     do_opt(char **, char **, struct exportlist *, struct grouplist *,
 158                                 int *, int *, struct ucred *);
 159 struct  exportlist *ex_search(fsid_t *);
 160 struct  exportlist *get_exp(void);
 161 void    free_dir(struct dirlist *);
 162 void    free_exp(struct exportlist *);
 163 void    free_grp(struct grouplist *);
 164 void    free_host(struct hostlist *);
 165 void    get_exportlist(void);
 166 int     get_host(char *, struct grouplist *, struct grouplist *);
 167 struct hostlist *get_ht(void);
 168 int     get_line(void);
 169 void    get_mountlist(void);
 170 int     get_net(char *, struct netmsk *, int);
 171 void    getexp_err(struct exportlist *, struct grouplist *);
 172 struct grouplist *get_grp(void);
 173 void    hang_dirp(struct dirlist *, struct grouplist *,
 174                                 struct exportlist *, int);
 175 void    huphandler(int sig);
 176 void    mntsrv(struct svc_req *, SVCXPRT *);
 177 void    nextfield(char **, char **);
 178 void    out_of_mem(void);
 179 void    parsecred(char *, struct ucred *);
 180 int     put_exlist(struct dirlist *, XDR *, struct dirlist *, int *);
 181 int     scan_tree(struct dirlist *, struct sockaddr *);
 182 static void usage(void);
 183 int     xdr_dir(XDR *, char *);
 184 int     xdr_explist(XDR *, caddr_t);
 185 int     xdr_fhs(XDR *, caddr_t);
 186 int     xdr_mlist(XDR *, caddr_t);
 187 void    terminate(int);
 188
 189 static int      allones(struct sockaddr_storage *, int);
 190 static int      bitcmp(void *, void *, int);
 191 static int      countones(struct sockaddr *);
 192 static int      netpartcmp(struct sockaddr *, struct sockaddr *, int);
 193 static int      sacmp(struct sockaddr *, struct sockaddr *);
 194
 195 struct exportlist *exphead;
 196 struct mountlist *mlhead;
 197 struct grouplist *grphead;
 198 char exname[MAXPATHLEN];
 199 struct ucred def_anon = {
 200         1,
 201         (uid_t) -2,
 202         1,
 203         { (gid_t) -2 }
 204 };
 205 int force_v2 = 0;
 206 int resvport_only = 1;
 207 int dir_only = 1;
 208 int do_log = 0;
 209 int got_sighup = 0;
 210
 211 int opt_flags;
 212 static int have_v6 = 1;
 213 #ifdef NI_WITHSCOPEID
 214 static const int ninumeric = NI_NUMERICHOST | NI_WITHSCOPEID;
 215 #else
 216 static const int ninumeric = NI_NUMERICHOST;
 217 #endif
 218
 219 struct pidfh *pfh = NULL;
 220 /* Bits for above */
 221 #define OP_MAPROOT      0x01
 222 #define OP_MAPALL       0x02
 223 #define OP_KERB         0x04
 224 #define OP_MASK         0x08
 225 #define OP_NET          0x10
 226 #define OP_ALLDIRS      0x40
 227 /* 0x80 is OP_HAVEMASK in FreeBSD 5+ */
 228 #define OP_QUIET        0x100
 229 #define OP_MASKLEN      0x200
 230
 231 #ifdef DEBUG
 232 int debug = 1;
 233 void    SYSLOG(int, const char *, ...);
 234 #define syslog SYSLOG
 235 #else
 236 int debug = 0;
 237 #endif
 238
 239 /*
 240  * Mountd server for NFS mount protocol as described in:
 241  * NFS: Network File System Protocol Specification, RFC1094, Appendix A
 242  * The optional arguments are the exports file name
 243  * default: _PATH_EXPORTS
 244  * and "-n" to allow nonroot mount.
 245  */
 246 int
 247 main(int argc, char **argv)
 248 {
 249         fd_set readfds;
 250         SVCXPRT *udptransp, *tcptransp, *udp6transp, *tcp6transp;
 251         struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf;
 252         pid_t otherpid;
 253         int udpsock, tcpsock, udp6sock, tcp6sock;
 254         int xcreated = 0, s;
 255         int one = 1;
 256         int c, error, mib[3];
 257         struct vfsconf vfc;
 258
 259         udp6conf = tcp6conf = NULL;
 260         udp6sock = tcp6sock = 0;
 261
 262         /* Check that another mountd isn't already running. */
 263         pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &otherpid);
 264         if (pfh == NULL) {
 265                 if (errno == EEXIST)
 266                         errx(1, "mountd already running, pid: %d.", otherpid);
 267                 warn("cannot open or create pidfile");
 268         }
 269
 270         s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
 271         if (s < 0)
 272                 have_v6 = 0;
 273         else
 274                 close(s);
 275         error = getvfsbyname("nfs", &vfc);
 276         if (error && vfsisloadable("nfs")) {
 277                 if(vfsload("nfs"))
 278                         err(1, "vfsload(nfs)");
 279                 endvfsent();    /* flush cache */
 280                 error = getvfsbyname("nfs", &vfc);
 281         }
 282         if (error)
 283                 errx(1, "NFS support is not available in the running kernel");
 284
 285         while ((c = getopt(argc, argv, "2dlnr")) != -1)
 286                 switch (c) {
 287                 case '2':
 288                         force_v2 = 1;
 289                         break;
 290                 case 'n':
 291                         resvport_only = 0;
 292                         break;
 293                 case 'r':
 294                         dir_only = 0;
 295                         break;
 296                 case 'd':
 297                         debug = debug ? 0 : 1;
 298                         break;
 299                 case 'l':
 300                         do_log = 1;
 301                         break;
 302                 default:
 303                         usage();
 304                 }
 305         argc -= optind;
 306         argv += optind;
 307         grphead = NULL;
 308         exphead = NULL;
 309         mlhead = NULL;
 310         if (argc == 1) {
 311                 strncpy(exname, *argv, MAXPATHLEN-1);
 312                 exname[MAXPATHLEN-1] = '\0';
 313         } else
 314                 strcpy(exname, _PATH_EXPORTS);
 315         openlog("mountd", LOG_PID, LOG_DAEMON);
 316         if (debug)
 317                 warnx("getting export list");
 318         get_exportlist();
 319         if (debug)
 320                 warnx("getting mount list");
 321         get_mountlist();
 322         if (debug)
 323                 warnx("here we go");
 324         if (debug == 0) {
 325                 daemon(0, 0);
 326                 signal(SIGINT, SIG_IGN);
 327                 signal(SIGQUIT, SIG_IGN);
 328         }
 329         signal(SIGHUP, huphandler);
 330         signal(SIGTERM, terminate);
 331
 332         pidfile_write(pfh);
 333
 334         rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL);
 335         rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL);
 336         udpsock  = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 337         tcpsock  = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 338         udpconf  = getnetconfigent("udp");
 339         tcpconf  = getnetconfigent("tcp");
 340         if (!have_v6)
 341                 goto skip_v6;
 342         udp6sock = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
 343         tcp6sock = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
 344         /*
 345          * We're doing host-based access checks here, so don't allow
 346          * v4-in-v6 to confuse things. The kernel will disable it
 347          * by default on NFS sockets too.
 348          */
 349         if (udp6sock != -1 && setsockopt(udp6sock, IPPROTO_IPV6,
 350                 IPV6_BINDV6ONLY, &one, sizeof one) < 0){
 351                 syslog(LOG_ERR, "can't disable v4-in-v6 on UDP socket");
 352                 exit(1);
 353         }
 354         if (tcp6sock != -1 && setsockopt(tcp6sock, IPPROTO_IPV6,
 355                 IPV6_BINDV6ONLY, &one, sizeof one) < 0){
 356                 syslog(LOG_ERR, "can't disable v4-in-v6 on UDP socket");
 357                 exit(1);
 358         }
 359         udp6conf = getnetconfigent("udp6");
 360         tcp6conf = getnetconfigent("tcp6");
 361
 362 skip_v6:
 363         if (!resvport_only) {
 364                 mib[0] = CTL_VFS;
 365                 mib[1] = vfc.vfc_typenum;
 366                 mib[2] = NFS_NFSPRIVPORT;
 367                 if (sysctl(mib, 3, NULL, NULL, &resvport_only,
 368                     sizeof(resvport_only)) != 0 && errno != ENOENT) {
 369                         syslog(LOG_ERR, "sysctl: %m");
 370                         exit(1);
 371                 }
 372         }
 373         if ((udptransp = svcudp_create(RPC_ANYSOCK)) == NULL ||
 374             (tcptransp = svctcp_create(RPC_ANYSOCK, 0, 0)) == NULL) {
 375                 syslog(LOG_ERR, "can't create socket");
 376                 exit(1);
 377         }
 378         if (udpsock != -1 && udpconf != NULL) {
 379                 bindresvport(udpsock, NULL);
 380                 udptransp = svc_dg_create(udpsock, 0, 0);
 381                 if (udptransp != NULL) {
 382                         if (!svc_reg(udptransp, RPCPROG_MNT, RPCMNT_VER1,
 383                             mntsrv, udpconf))
 384                                 syslog(LOG_WARNING, "can't register UDP RPCMNT_VER1 service");
 385                         else
 386                                 xcreated++;
 387                         if (!force_v2) {
 388                                 if (!svc_reg(udptransp, RPCPROG_MNT, RPCMNT_VER3,
 389                                     mntsrv, udpconf))
 390                                         syslog(LOG_WARNING, "can't register UDP RPCMNT_VER3 service");
 391                                 else
 392                                         xcreated++;
 393                         }
 394                 } else
 395                         syslog(LOG_WARNING, "can't create UDP services");
 396
 397         }
 398         if (tcpsock != -1 && tcpconf != NULL) {
 399                 bindresvport(tcpsock, NULL);
 400                 listen(tcpsock, SOMAXCONN);
 401                 tcptransp = svc_vc_create(tcpsock, 0, 0);
 402                 if (tcptransp != NULL) {
 403                         if (!svc_reg(tcptransp, RPCPROG_MNT, RPCMNT_VER1,
 404                             mntsrv, tcpconf))
 405                                 syslog(LOG_WARNING, "can't register TCP RPCMNT_VER1 service");
 406                         else
 407                                 xcreated++;
 408                         if (!force_v2) {
 409                                 if (!svc_reg(tcptransp, RPCPROG_MNT, RPCMNT_VER3,
 410                                     mntsrv, tcpconf))
 411                                         syslog(LOG_WARNING, "can't register TCP RPCMNT_VER3 service");
 412                                 else
 413                                         xcreated++;
 414                         }
 415                 } else
 416                         syslog(LOG_WARNING, "can't create TCP service");
 417
 418         }
 419         if (have_v6 && udp6sock != -1 && udp6conf != NULL) {
 420                 bindresvport(udp6sock, NULL);
 421                 udp6transp = svc_dg_create(udp6sock, 0, 0);
 422                 if (udp6transp != NULL) {
 423                         if (!svc_reg(udp6transp, RPCPROG_MNT, RPCMNT_VER1,
 424                             mntsrv, udp6conf))
 425                                 syslog(LOG_WARNING, "can't register UDP6 RPCMNT_VER1 service");
 426                         else
 427                                 xcreated++;
 428                         if (!force_v2) {
 429                                 if (!svc_reg(udp6transp, RPCPROG_MNT, RPCMNT_VER3,
 430                                     mntsrv, udp6conf))
 431                                         syslog(LOG_WARNING, "can't register UDP6 RPCMNT_VER3 service");
 432                                 else
 433                                         xcreated++;
 434                         }
 435                 } else
 436                         syslog(LOG_WARNING, "can't create UDP6 service");
 437
 438         }
 439         if (have_v6 && tcp6sock != -1 && tcp6conf != NULL) {
 440                 bindresvport(tcp6sock, NULL);
 441                 listen(tcp6sock, SOMAXCONN);
 442                 tcp6transp = svc_vc_create(tcp6sock, 0, 0);
 443                 if (tcp6transp != NULL) {
 444                         if (!svc_reg(tcp6transp, RPCPROG_MNT, RPCMNT_VER1,
 445                             mntsrv, tcp6conf))
 446                                 syslog(LOG_WARNING, "can't register TCP6 RPCMNT_VER1 service");
 447                         else
 448                                 xcreated++;
 449                         if (!force_v2) {
 450                                 if (!svc_reg(tcp6transp, RPCPROG_MNT, RPCMNT_VER3,
 451                                     mntsrv, tcp6conf))
 452                                         syslog(LOG_WARNING, "can't register TCP6 RPCMNT_VER3 service");
 453                                         else
 454                                                 xcreated++;
 455                                 }
 456                 } else
 457                         syslog(LOG_WARNING, "can't create TCP6 service");
 458
 459         }
 460         if (xcreated == 0) {
 461                 syslog(LOG_ERR, "could not create any services");
 462                 exit(1);
 463         }
 464
 465         /* Expand svc_run() here so that we can call get_exportlist(). */
 466         for (;;) {
 467                 if (got_sighup) {
 468                         get_exportlist();
 469                         got_sighup = 0;
 470                 }
 471                 readfds = svc_fdset;
 472                 switch (select(svc_maxfd + 1, &readfds, NULL, NULL, NULL)) {
 473                 case -1:
 474                         if (errno == EINTR)
 475                                 continue;
 476                         syslog(LOG_ERR, "mountd died: select: %m");
 477                         exit(1);
 478                 case 0:
 479                         continue;
 480                 default:
 481                         svc_getreqset(&readfds);
 482                 }
 483         }
 484 }
 485
 486 static void
 487 usage(void)
 488 {
 489         fprintf(stderr,
 490                 "usage: mountd [-2] [-d] [-l] [-n] [-r] [export_file]\n");
 491         exit(1);
 492 }
 493
 494 /*
 495  * The mount rpc service
 496  */
 497 void
 498 mntsrv(struct svc_req *rqstp, SVCXPRT *transp)
 499 {
 500         struct exportlist *ep;
 501         struct dirlist *dp;
 502         struct fhreturn fhr;
 503         struct stat stb;
 504         struct statfs fsb;
 505         char host[NI_MAXHOST], numerichost[NI_MAXHOST];
 506         int lookup_failed = 1;
 507         struct sockaddr *saddr;
 508         u_short sport;
 509         char rpcpath[RPCMNT_PATHLEN + 1], dirpath[MAXPATHLEN];
 510         int bad = 0, defset, hostset;
 511         sigset_t sighup_mask;
 512
 513         sigemptyset(&sighup_mask);
 514         sigaddset(&sighup_mask, SIGHUP);
 515         saddr = svc_getrpccaller(transp)->buf;
 516         switch (saddr->sa_family) {
 517         case AF_INET6:
 518                 sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port);
 519                 break;
 520         case AF_INET:
 521                 sport = ntohs(((struct sockaddr_in *)saddr)->sin_port);
 522                 break;
 523         default:
 524                 syslog(LOG_ERR, "request from unknown address family");
 525                 return;
 526         }
 527         lookup_failed = getnameinfo(saddr, saddr->sa_len, host, sizeof host,
 528             NULL, 0, 0);
 529         getnameinfo(saddr, saddr->sa_len, numerichost,
 530             sizeof numerichost, NULL, 0, NI_NUMERICHOST);
 531         switch (rqstp->rq_proc) {
 532         case NULLPROC:
 533                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
 534                         syslog(LOG_ERR, "can't send reply");
 535                 return;
 536         case RPCMNT_MOUNT:
 537                 if (sport >= IPPORT_RESERVED && resvport_only) {
 538                         syslog(LOG_NOTICE,
 539                             "mount request from %s from unprivileged port",
 540                             numerichost);
 541                         svcerr_weakauth(transp);
 542                         return;
 543                 }
 544                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
 545                         syslog(LOG_NOTICE, "undecodable mount request from %s",
 546                             numerichost);
 547                         svcerr_decode(transp);
 548                         return;
 549                 }
 550
 551                 /*
 552                  * Get the real pathname and make sure it is a directory
 553                  * or a regular file if the -r option was specified
 554                  * and it exists.
 555                  */
 556                 if (realpath(rpcpath, dirpath) == NULL ||
 557                     stat(dirpath, &stb) < 0 ||
 558                     (!S_ISDIR(stb.st_mode) &&
 559                     (dir_only || !S_ISREG(stb.st_mode))) ||
 560                     statfs(dirpath, &fsb) < 0) {
 561                         chdir("/");     /* Just in case realpath doesn't */
 562                         syslog(LOG_NOTICE,
 563                             "mount request from %s for non existent path %s",
 564                             numerichost, dirpath);
 565                         if (debug)
 566                                 warnx("stat failed on %s", dirpath);
 567                         bad = ENOENT;   /* We will send error reply later */
 568                 }
 569
 570                 /* Check in the exports list */
 571                 sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
 572                 ep = ex_search(&fsb.f_fsid);
 573                 hostset = defset = 0;
 574                 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset) ||
 575                     ((dp = dirp_search(ep->ex_dirl, dirpath)) &&
 576                       chk_host(dp, saddr, &defset, &hostset)) ||
 577                     (defset && scan_tree(ep->ex_defdir, saddr) == 0 &&
 578                      scan_tree(ep->ex_dirl, saddr) == 0))) {
 579                         if (bad) {
 580                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
 581                                     &bad))
 582                                         syslog(LOG_ERR, "can't send reply");
 583                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 584                                 return;
 585                         }
 586                         if (hostset & DP_HOSTSET)
 587                                 fhr.fhr_flag = hostset;
 588                         else
 589                                 fhr.fhr_flag = defset;
 590                         fhr.fhr_vers = rqstp->rq_vers;
 591                         /* Get the file handle */
 592                         memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t));
 593                         if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) {
 594                                 bad = errno;
 595                                 syslog(LOG_ERR, "can't get fh for %s", dirpath);
 596                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
 597                                     &bad))
 598                                         syslog(LOG_ERR, "can't send reply");
 599                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 600                                 return;
 601                         }
 602                         if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs, &fhr))
 603                                 syslog(LOG_ERR, "can't send reply");
 604                         if (!lookup_failed)
 605                                 add_mlist(host, dirpath);
 606                         else
 607                                 add_mlist(numerichost, dirpath);
 608                         if (debug)
 609                                 warnx("mount successful");
 610                         if (do_log)
 611                                 syslog(LOG_NOTICE,
 612                                     "mount request succeeded from %s for %s",
 613                                     numerichost, dirpath);
 614                 } else {
 615                         bad = EACCES;
 616                         syslog(LOG_NOTICE,
 617                             "mount request denied from %s for %s",
 618                             numerichost, dirpath);
 619                 }
 620
 621                 if (bad && !svc_sendreply(transp, (xdrproc_t)xdr_long, &bad))
 622                         syslog(LOG_ERR, "can't send reply");
 623                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 624                 return;
 625         case RPCMNT_DUMP:
 626                 if (!svc_sendreply(transp, (xdrproc_t)xdr_mlist, NULL))
 627                         syslog(LOG_ERR, "can't send reply");
 628                 else if (do_log)
 629                         syslog(LOG_NOTICE,
 630                             "dump request succeeded from %s",
 631                             numerichost);
 632                 return;
 633         case RPCMNT_UMOUNT:
 634                 if (sport >= IPPORT_RESERVED && resvport_only) {
 635                         syslog(LOG_NOTICE,
 636                             "umount request from %s from unprivileged port",
 637                             numerichost);
 638                         svcerr_weakauth(transp);
 639                         return;
 640                 }
 641                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
 642                         syslog(LOG_NOTICE, "undecodable umount request from %s",
 643                             numerichost);
 644                         svcerr_decode(transp);
 645                         return;
 646                 }
 647                 if (realpath(rpcpath, dirpath) == NULL) {
 648                         syslog(LOG_NOTICE, "umount request from %s "
 649                             "for non existent path %s",
 650                             numerichost, dirpath);
 651                 }
 652                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
 653                         syslog(LOG_ERR, "can't send reply");
 654                 if (!lookup_failed)
 655                         del_mlist(host, dirpath);
 656                 del_mlist(numerichost, dirpath);
 657                 if (do_log)
 658                         syslog(LOG_NOTICE,
 659                             "umount request succeeded from %s for %s",
 660                             numerichost, dirpath);
 661                 return;
 662         case RPCMNT_UMNTALL:
 663                 if (sport >= IPPORT_RESERVED && resvport_only) {
 664                         syslog(LOG_NOTICE,
 665                             "umountall request from %s from unprivileged port",
 666                             numerichost);
 667                         svcerr_weakauth(transp);
 668                         return;
 669                 }
 670                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
 671                         syslog(LOG_ERR, "can't send reply");
 672                 if (!lookup_failed)
 673                         del_mlist(host, NULL);
 674                 del_mlist(numerichost, NULL);
 675                 if (do_log)
 676                         syslog(LOG_NOTICE,
 677                             "umountall request succeeded from %s",
 678                             numerichost);
 679                 return;
 680         case RPCMNT_EXPORT:
 681                 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, NULL))
 682                         syslog(LOG_ERR, "can't send reply");
 683                 if (do_log)
 684                         syslog(LOG_NOTICE,
 685                             "export request succeeded from %s",
 686                             numerichost);
 687                 return;
 688         default:
 689                 svcerr_noproc(transp);
 690                 return;
 691         }
 692 }
 693
 694 /*
 695  * Xdr conversion for a dirpath string
 696  */
 697 int
 698 xdr_dir(XDR *xdrsp, char *dirp)
 699 {
 700         return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
 701 }
 702
 703 /*
 704  * Xdr routine to generate file handle reply
 705  */
 706 int
 707 xdr_fhs(XDR *xdrsp, caddr_t cp)
 708 {
 709         struct fhreturn *fhrp = (struct fhreturn *)cp;
 710         u_long ok = 0, len, auth;
 711
 712         if (!xdr_long(xdrsp, &ok))
 713                 return (0);
 714         switch (fhrp->fhr_vers) {
 715         case 1:
 716                 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH));
 717         case 3:
 718                 len = NFSX_V3FH;
 719                 if (!xdr_long(xdrsp, &len))
 720                         return (0);
 721                 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len))
 722                         return (0);
 723                 if (fhrp->fhr_flag & DP_KERB)
 724                         auth = RPCAUTH_KERB4;
 725                 else
 726                         auth = RPCAUTH_UNIX;
 727                 len = 1;
 728                 if (!xdr_long(xdrsp, &len))
 729                         return (0);
 730                 return (xdr_long(xdrsp, &auth));
 731         }
 732         return (0);
 733 }
 734
 735 int
 736 xdr_mlist(XDR *xdrsp, caddr_t cp)
 737 {
 738         struct mountlist *mlp;
 739         int true = 1;
 740         int false = 0;
 741         char *strp;
 742
 743         mlp = mlhead;
 744         while (mlp) {
 745                 if (!xdr_bool(xdrsp, &true))
 746                         return (0);
 747                 strp = &mlp->ml_host[0];
 748                 if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
 749                         return (0);
 750                 strp = &mlp->ml_dirp[0];
 751                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 752                         return (0);
 753                 mlp = mlp->ml_next;
 754         }
 755         if (!xdr_bool(xdrsp, &false))
 756                 return (0);
 757         return (1);
 758 }
 759
 760 /*
 761  * Xdr conversion for export list
 762  */
 763 int
 764 xdr_explist(XDR *xdrsp, caddr_t cp)
 765 {
 766         struct exportlist *ep;
 767         int false = 0;
 768         int putdef;
 769         sigset_t sighup_mask;
 770
 771         sigemptyset(&sighup_mask);
 772         sigaddset(&sighup_mask, SIGHUP);
 773         sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
 774         ep = exphead;
 775         while (ep) {
 776                 putdef = 0;
 777                 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir, &putdef))
 778                         goto errout;
 779                 if (ep->ex_defdir && putdef == 0 &&
 780                         put_exlist(ep->ex_defdir, xdrsp, NULL,
 781                         &putdef))
 782                         goto errout;
 783                 ep = ep->ex_next;
 784         }
 785         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 786         if (!xdr_bool(xdrsp, &false))
 787                 return (0);
 788         return (1);
 789 errout:
 790         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 791         return (0);
 792 }
 793
 794 /*
 795  * Called from xdr_explist() to traverse the tree and export the
 796  * directory paths.
 797  */
 798 int
 799 put_exlist(struct dirlist *dp, XDR *xdrsp, struct dirlist *adp, int *putdefp)
 800 {
 801         struct grouplist *grp;
 802         struct hostlist *hp;
 803         int true = 1;
 804         int false = 0;
 805         int gotalldir = 0;
 806         char *strp;
 807
 808         if (dp) {
 809                 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp))
 810                         return (1);
 811                 if (!xdr_bool(xdrsp, &true))
 812                         return (1);
 813                 strp = dp->dp_dirp;
 814                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 815                         return (1);
 816                 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) {
 817                         gotalldir = 1;
 818                         *putdefp = 1;
 819                 }
 820                 if ((dp->dp_flag & DP_DEFSET) == 0 &&
 821                     (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) {
 822                         hp = dp->dp_hosts;
 823                         while (hp) {
 824                                 grp = hp->ht_grp;
 825                                 if (grp->gr_type == GT_HOST) {
 826                                         if (!xdr_bool(xdrsp, &true))
 827                                                 return (1);
 828                                         strp = grp->gr_ptr.gt_addrinfo->ai_canonname;
 829                                         if (!xdr_string(xdrsp, &strp,
 830                                             RPCMNT_NAMELEN))
 831                                                 return (1);
 832                                 } else if (grp->gr_type == GT_NET) {
 833                                         if (!xdr_bool(xdrsp, &true))
 834                                                 return (1);
 835                                         strp = grp->gr_ptr.gt_net.nt_name;
 836                                         if (!xdr_string(xdrsp, &strp,
 837                                             RPCMNT_NAMELEN))
 838                                                 return (1);
 839                                 }
 840                                 hp = hp->ht_next;
 841                                 if (gotalldir && hp == NULL) {
 842                                         hp = adp->dp_hosts;
 843                                         gotalldir = 0;
 844                                 }
 845                         }
 846                 }
 847                 if (!xdr_bool(xdrsp, &false))
 848                         return (1);
 849                 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp))
 850                         return (1);
 851         }
 852         return (0);
 853 }
 854
 855 #define LINESIZ 10240
 856 char line[LINESIZ];
 857 FILE *exp_file;
 858
 859 /*
 860  * Get the export list
 861  */
 862 void
 863 get_exportlist(void)
 864 {
 865         struct exportlist *ep, *ep2;
 866         struct grouplist *grp, *tgrp;
 867         struct exportlist **epp;
 868         struct dirlist *dirhead;
 869         struct statfs fsb, *fsp;
 870         struct ucred anon;
 871         char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc;
 872         int len, has_host, exflags, got_nondir, dirplen, num, i, netgrp;
 873
 874         dirp = NULL;
 875         dirplen = 0;
 876
 877         /*
 878          * First, get rid of the old list
 879          */
 880         ep = exphead;
 881         while (ep) {
 882                 ep2 = ep;
 883                 ep = ep->ex_next;
 884                 free_exp(ep2);
 885         }
 886         exphead = NULL;
 887
 888         grp = grphead;
 889         while (grp) {
 890                 tgrp = grp;
 891                 grp = grp->gr_next;
 892                 free_grp(tgrp);
 893         }
 894         grphead = NULL;
 895
 896         /*
 897          * And delete exports that are in the kernel for all local
 898          * file systems.
 899          * XXX: Should know how to handle all local exportable file systems
 900          *      instead of just "ufs".
 901          */
 902         num = getmntinfo(&fsp, MNT_NOWAIT);
 903         for (i = 0; i < num; i++) {
 904                 union {
 905                         struct ufs_args ua;
 906                         struct iso_args ia;
 907                         struct mfs_args ma;
 908                         struct msdosfs_args da;
 909                         struct ntfs_args na;
 910                 } targs;
 911                 struct export_args export;
 912
 913                 export.ex_flags = MNT_DELEXPORT;
 914                 if (mountctl(fsp->f_mntonname, MOUNTCTL_SET_EXPORT, -1,
 915                              &export, sizeof(export), NULL, 0) == 0) {
 916                 } else if (!strcmp(fsp->f_fstypename, "mfs") ||
 917                     !strcmp(fsp->f_fstypename, "ufs") ||
 918                     !strcmp(fsp->f_fstypename, "msdos") ||
 919                     !strcmp(fsp->f_fstypename, "ntfs") ||
 920                     !strcmp(fsp->f_fstypename, "cd9660")) {
 921                         targs.ua.fspec = NULL;
 922                         targs.ua.export.ex_flags = MNT_DELEXPORT;
 923                         if (mount(fsp->f_fstypename, fsp->f_mntonname,
 924                                   fsp->f_flags | MNT_UPDATE,
 925                                   (caddr_t)&targs) < 0)
 926                                 syslog(LOG_ERR, "can't delete exports for %s",
 927                                     fsp->f_mntonname);
 928                 }
 929                 fsp++;
 930         }
 931
 932         /*
 933          * Read in the exports file and build the list, calling
 934          * mount() as we go along to push the export rules into the kernel.
 935          */
 936         if ((exp_file = fopen(exname, "r")) == NULL) {
 937                 syslog(LOG_ERR, "can't open %s", exname);
 938                 exit(2);
 939         }
 940         dirhead = NULL;
 941         while (get_line()) {
 942                 if (debug)
 943                         warnx("got line %s", line);
 944                 cp = line;
 945                 nextfield(&cp, &endcp);
 946                 if (*cp == '#')
 947                         goto nextline;
 948
 949                 /*
 950                  * Set defaults.
 951                  */
 952                 has_host = FALSE;
 953                 anon = def_anon;
 954                 exflags = MNT_EXPORTED;
 955                 got_nondir = 0;
 956                 opt_flags = 0;
 957                 ep = NULL;
 958
 959                 /*
 960                  * Create new exports list entry
 961                  */
 962                 len = endcp-cp;
 963                 tgrp = grp = get_grp();
 964                 while (len > 0) {
 965                         if (len > RPCMNT_NAMELEN) {
 966                             getexp_err(ep, tgrp);
 967                             goto nextline;
 968                         }
 969                         if (*cp == '-') {
 970                             if (ep == NULL) {
 971                                 getexp_err(ep, tgrp);
 972                                 goto nextline;
 973                             }
 974                             if (debug)
 975                                 warnx("doing opt %s", cp);
 976                             got_nondir = 1;
 977                             if (do_opt(&cp, &endcp, ep, grp, &has_host,
 978                                 &exflags, &anon)) {
 979                                 getexp_err(ep, tgrp);
 980                                 goto nextline;
 981                             }
 982                         } else if (*cp == '/') {
 983                             savedc = *endcp;
 984                             *endcp = '\0';
 985                             if (check_dirpath(cp) &&
 986                                 statfs(cp, &fsb) >= 0) {
 987                                 if (got_nondir) {
 988                                     syslog(LOG_ERR, "dirs must be first");
 989                                     getexp_err(ep, tgrp);
 990                                     goto nextline;
 991                                 }
 992                                 if (ep) {
 993                                     if (ep->ex_fs.val[0] != fsb.f_fsid.val[0] ||
 994                                         ep->ex_fs.val[1] != fsb.f_fsid.val[1]) {
 995                                         getexp_err(ep, tgrp);
 996                                         goto nextline;
 997                                     }
 998                                 } else {
 999                                     /*
1000                                      * See if this directory is already
1001                                      * in the list.
1002                                      */
1003                                     ep = ex_search(&fsb.f_fsid);
1004                                     if (ep == NULL) {
1005                                         ep = get_exp();
1006                                         ep->ex_fs = fsb.f_fsid;
1007                                         ep->ex_fsdir = (char *)
1008                                             malloc(strlen(fsb.f_mntonname) + 1);
1009                                         if (ep->ex_fsdir)
1010                                             strcpy(ep->ex_fsdir,
1011                                                 fsb.f_mntonname);
1012                                         else
1013                                             out_of_mem();
1014                                         if (debug)
1015                                                 warnx("making new ep fs=0x%x,0x%x",
1016                                                     fsb.f_fsid.val[0],
1017                                                     fsb.f_fsid.val[1]);
1018                                     } else if (debug)
1019                                         warnx("found ep fs=0x%x,0x%x",
1020                                             fsb.f_fsid.val[0],
1021                                             fsb.f_fsid.val[1]);
1022                                 }
1023
1024                                 /*
1025                                  * Add dirpath to export mount point.
1026                                  */
1027                                 dirp = add_expdir(&dirhead, cp, len);
1028                                 dirplen = len;
1029                             } else {
1030                                 getexp_err(ep, tgrp);
1031                                 goto nextline;
1032                             }
1033                             *endcp = savedc;
1034                         } else {
1035                             savedc = *endcp;
1036                             *endcp = '\0';
1037                             got_nondir = 1;
1038                             if (ep == NULL) {
1039                                 getexp_err(ep, tgrp);
1040                                 goto nextline;
1041                             }
1042
1043                             /*
1044                              * Get the host or netgroup.
1045                              */
1046                             setnetgrent(cp);
1047                             netgrp = getnetgrent(&hst, &usr, &dom);
1048                             do {
1049                                 if (has_host) {
1050                                     grp->gr_next = get_grp();
1051                                     grp = grp->gr_next;
1052                                 }
1053                                 if (netgrp) {
1054                                     if (hst == NULL) {
1055                                         syslog(LOG_ERR,
1056                                 "null hostname in netgroup %s, skipping", cp);
1057                                         grp->gr_type = GT_IGNORE;
1058                                     } else if (get_host(hst, grp, tgrp)) {
1059                                         syslog(LOG_ERR,
1060                         "bad host %s in netgroup %s, skipping", hst, cp);
1061                                         grp->gr_type = GT_IGNORE;
1062                                     }
1063                                 } else if (get_host(cp, grp, tgrp)) {
1064                                     syslog(LOG_ERR, "bad host %s, skipping", cp);
1065                                     grp->gr_type = GT_IGNORE;
1066                                 }
1067                                 has_host = TRUE;
1068                             } while (netgrp && getnetgrent(&hst, &usr, &dom));
1069                             endnetgrent();
1070                             *endcp = savedc;
1071                         }
1072                         cp = endcp;
1073                         nextfield(&cp, &endcp);
1074                         len = endcp - cp;
1075                 }
1076                 if (check_options(dirhead)) {
1077                         getexp_err(ep, tgrp);
1078                         goto nextline;
1079                 }
1080                 if (!has_host) {
1081                         grp->gr_type = GT_DEFAULT;
1082                         if (debug)
1083                                 warnx("adding a default entry");
1084
1085                 /*
1086                  * Don't allow a network export coincide with a list of
1087                  * host(s) on the same line.
1088                  */
1089                 } else if ((opt_flags & OP_NET) && tgrp->gr_next) {
1090                         getexp_err(ep, tgrp);
1091                         goto nextline;
1092
1093                 /*
1094                  * If an export list was specified on this line, make sure
1095                  * that we have at least one valid entry, otherwise skip it.
1096                  */
1097                 } else {
1098                         grp = tgrp;
1099                         while (grp && grp->gr_type == GT_IGNORE)
1100                                 grp = grp->gr_next;
1101                         if (! grp) {
1102                             getexp_err(ep, tgrp);
1103                             goto nextline;
1104                         }
1105                 }
1106
1107                 /*
1108                  * Loop through hosts, pushing the exports into the kernel.
1109                  * After loop, tgrp points to the start of the list and
1110                  * grp points to the last entry in the list.
1111                  */
1112                 grp = tgrp;
1113                 do {
1114                         if (do_mount(ep, grp, exflags, &anon, dirp, dirplen,
1115                             &fsb)) {
1116                                 getexp_err(ep, tgrp);
1117                                 goto nextline;
1118                         }
1119                 } while (grp->gr_next && (grp = grp->gr_next));
1120
1121                 /*
1122                  * Success. Update the data structures.
1123                  */
1124                 if (has_host) {
1125                         hang_dirp(dirhead, tgrp, ep, opt_flags);
1126                         grp->gr_next = grphead;
1127                         grphead = tgrp;
1128                 } else {
1129                         hang_dirp(dirhead, NULL, ep,
1130                                 opt_flags);
1131                         free_grp(grp);
1132                 }
1133                 dirhead = NULL;
1134                 if ((ep->ex_flag & EX_LINKED) == 0) {
1135                         ep2 = exphead;
1136                         epp = &exphead;
1137
1138                         /*
1139                          * Insert in the list in alphabetical order.
1140                          */
1141                         while (ep2 && strcmp(ep2->ex_fsdir, ep->ex_fsdir) < 0) {
1142                                 epp = &ep2->ex_next;
1143                                 ep2 = ep2->ex_next;
1144                         }
1145                         if (ep2)
1146                                 ep->ex_next = ep2;
1147                         *epp = ep;
1148                         ep->ex_flag |= EX_LINKED;
1149                 }
1150 nextline:
1151                 if (dirhead) {
1152                         free_dir(dirhead);
1153                         dirhead = NULL;
1154                 }
1155         }
1156         fclose(exp_file);
1157 }
1158
1159 /*
1160  * Allocate an export list element
1161  */
1162 struct exportlist *
1163 get_exp(void)
1164 {
1165         struct exportlist *ep;
1166
1167         ep = (struct exportlist *)malloc(sizeof (struct exportlist));
1168         if (ep == NULL)
1169                 out_of_mem();
1170         memset(ep, 0, sizeof(struct exportlist));
1171         return (ep);
1172 }
1173
1174 /*
1175  * Allocate a group list element
1176  */
1177 struct grouplist *
1178 get_grp(void)
1179 {
1180         struct grouplist *gp;
1181
1182         gp = (struct grouplist *)malloc(sizeof (struct grouplist));
1183         if (gp == NULL)
1184                 out_of_mem();
1185         memset(gp, 0, sizeof(struct grouplist));
1186         return (gp);
1187 }
1188
1189 /*
1190  * Clean up upon an error in get_exportlist().
1191  */
1192 void
1193 getexp_err(struct exportlist *ep, struct grouplist *grp)
1194 {
1195         struct grouplist *tgrp;
1196
1197         if (!(opt_flags & OP_QUIET))
1198                 syslog(LOG_ERR, "bad exports list line %s", line);
1199         if (ep && (ep->ex_flag & EX_LINKED) == 0)
1200                 free_exp(ep);
1201         while (grp) {
1202                 tgrp = grp;
1203                 grp = grp->gr_next;
1204                 free_grp(tgrp);
1205         }
1206 }
1207
1208 /*
1209  * Search the export list for a matching fs.
1210  */
1211 struct exportlist *
1212 ex_search(fsid_t *fsid)
1213 {
1214         struct exportlist *ep;
1215
1216         ep = exphead;
1217         while (ep) {
1218                 if (ep->ex_fs.val[0] == fsid->val[0] &&
1219                     ep->ex_fs.val[1] == fsid->val[1])
1220                         return (ep);
1221                 ep = ep->ex_next;
1222         }
1223         return (ep);
1224 }
1225
1226 /*
1227  * Add a directory path to the list.
1228  */
1229 char *
1230 add_expdir(struct dirlist **dpp, char *cp, int len)
1231 {
1232         struct dirlist *dp;
1233
1234         dp = (struct dirlist *)malloc(sizeof (struct dirlist) + len);
1235         if (dp == NULL)
1236                 out_of_mem();
1237         dp->dp_left = *dpp;
1238         dp->dp_right = NULL;
1239         dp->dp_flag = 0;
1240         dp->dp_hosts = NULL;
1241         strcpy(dp->dp_dirp, cp);
1242         *dpp = dp;
1243         return (dp->dp_dirp);
1244 }
1245
1246 /*
1247  * Hang the dir list element off the dirpath binary tree as required
1248  * and update the entry for host.
1249  */
1250 void
1251 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep,
1252           int flags)
1253 {
1254         struct hostlist *hp;
1255         struct dirlist *dp2;
1256
1257         if (flags & OP_ALLDIRS) {
1258                 if (ep->ex_defdir)
1259                         free((caddr_t)dp);
1260                 else
1261                         ep->ex_defdir = dp;
1262                 if (grp == NULL) {
1263                         ep->ex_defdir->dp_flag |= DP_DEFSET;
1264                         if (flags & OP_KERB)
1265                                 ep->ex_defdir->dp_flag |= DP_KERB;
1266                 } else while (grp) {
1267                         hp = get_ht();
1268                         if (flags & OP_KERB)
1269                                 hp->ht_flag |= DP_KERB;
1270                         hp->ht_grp = grp;
1271                         hp->ht_next = ep->ex_defdir->dp_hosts;
1272                         ep->ex_defdir->dp_hosts = hp;
1273                         grp = grp->gr_next;
1274                 }
1275         } else {
1276
1277                 /*
1278                  * Loop through the directories adding them to the tree.
1279                  */
1280                 while (dp) {
1281                         dp2 = dp->dp_left;
1282                         add_dlist(&ep->ex_dirl, dp, grp, flags);
1283                         dp = dp2;
1284                 }
1285         }
1286 }
1287
1288 /*
1289  * Traverse the binary tree either updating a node that is already there
1290  * for the new directory or adding the new node.
1291  */
1292 void
1293 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp,
1294           int flags)
1295 {
1296         struct dirlist *dp;
1297         struct hostlist *hp;
1298         int cmp;
1299
1300         dp = *dpp;
1301         if (dp) {
1302                 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp);
1303                 if (cmp > 0) {
1304                         add_dlist(&dp->dp_left, newdp, grp, flags);
1305                         return;
1306                 } else if (cmp < 0) {
1307                         add_dlist(&dp->dp_right, newdp, grp, flags);
1308                         return;
1309                 } else
1310                         free((caddr_t)newdp);
1311         } else {
1312                 dp = newdp;
1313                 dp->dp_left = NULL;
1314                 *dpp = dp;
1315         }
1316         if (grp) {
1317
1318                 /*
1319                  * Hang all of the host(s) off of the directory point.
1320                  */
1321                 do {
1322                         hp = get_ht();
1323                         if (flags & OP_KERB)
1324                                 hp->ht_flag |= DP_KERB;
1325                         hp->ht_grp = grp;
1326                         hp->ht_next = dp->dp_hosts;
1327                         dp->dp_hosts = hp;
1328                         grp = grp->gr_next;
1329                 } while (grp);
1330         } else {
1331                 dp->dp_flag |= DP_DEFSET;
1332                 if (flags & OP_KERB)
1333                         dp->dp_flag |= DP_KERB;
1334         }
1335 }
1336
1337 /*
1338  * Search for a dirpath on the export point.
1339  */
1340 struct dirlist *
1341 dirp_search(struct dirlist *dp, char *dirp)
1342 {
1343         int cmp;
1344
1345         if (dp) {
1346                 cmp = strcmp(dp->dp_dirp, dirp);
1347                 if (cmp > 0)
1348                         return (dirp_search(dp->dp_left, dirp));
1349                 else if (cmp < 0)
1350                         return (dirp_search(dp->dp_right, dirp));
1351                 else
1352                         return (dp);
1353         }
1354         return (dp);
1355 }
1356
1357 /*
1358  * Some helper functions for netmasks. They all assume masks in network
1359  * order (big endian).
1360  */
1361 static int
1362 bitcmp(void *dst, void *src, int bitlen)
1363 {
1364         int i;
1365         u_int8_t *p1 = dst, *p2 = src;
1366         u_int8_t bitmask;
1367         int bytelen, bitsleft;
1368
1369         bytelen = bitlen / 8;
1370         bitsleft = bitlen % 8;
1371
1372         if (debug) {
1373                 printf("comparing:\n");
1374                 for (i = 0; i < (bitsleft ? bytelen + 1 : bytelen); i++)
1375                         printf("%02x", p1[i]);
1376                 printf("\n");
1377                 for (i = 0; i < (bitsleft ? bytelen + 1 : bytelen); i++)
1378                         printf("%02x", p2[i]);
1379                 printf("\n");
1380         }
1381
1382         for (i = 0; i < bytelen; i++) {
1383                 if (*p1 != *p2)
1384                         return 1;
1385                 p1++;
1386                 p2++;
1387         }
1388
1389         for (i = 0; i < bitsleft; i++) {
1390                 bitmask = 1 << (7 - i);
1391                 if ((*p1 & bitmask) != (*p2 & bitmask))
1392                         return 1;
1393         }
1394
1395         return 0;
1396 }
1397
1398 /*
1399  * Scan for a host match in a directory tree.
1400  */
1401 int
1402 chk_host(struct dirlist *dp, struct sockaddr *saddr, int *defsetp,
1403          int *hostsetp)
1404 {
1405         struct hostlist *hp;
1406         struct grouplist *grp;
1407         struct addrinfo *ai;
1408
1409         if (dp) {
1410                 if (dp->dp_flag & DP_DEFSET)
1411                         *defsetp = dp->dp_flag;
1412                 hp = dp->dp_hosts;
1413                 while (hp) {
1414                         grp = hp->ht_grp;
1415                         switch (grp->gr_type) {
1416                         case GT_HOST:
1417                                 ai = grp->gr_ptr.gt_addrinfo;
1418                                 for (; ai; ai = ai->ai_next) {
1419                                         if (!sacmp(ai->ai_addr, saddr)) {
1420                                                 *hostsetp =
1421                                                     (hp->ht_flag | DP_HOSTSET);
1422                                                 return (1);
1423                                         }
1424                                 }
1425                             break;
1426                         case GT_NET:
1427                                 if (!netpartcmp(saddr,
1428                                     (struct sockaddr *) &grp->gr_ptr.gt_net.nt_net,
1429                                      grp->gr_ptr.gt_net.nt_mask)) {
1430                                         *hostsetp = (hp->ht_flag | DP_HOSTSET);
1431                                         return (1);
1432                                 }
1433                             break;
1434                         }
1435                         hp = hp->ht_next;
1436                 }
1437         }
1438         return (0);
1439 }
1440
1441 /*
1442  * Scan tree for a host that matches the address.
1443  */
1444 int
1445 scan_tree(struct dirlist *dp, struct sockaddr *saddr)
1446 {
1447         int defset, hostset;
1448
1449         if (dp) {
1450                 if (scan_tree(dp->dp_left, saddr))
1451                         return (1);
1452                 if (chk_host(dp, saddr, &defset, &hostset))
1453                         return (1);
1454                 if (scan_tree(dp->dp_right, saddr))
1455                         return (1);
1456         }
1457         return (0);
1458 }
1459
1460 /*
1461  * Traverse the dirlist tree and free it up.
1462  */
1463 void
1464 free_dir(struct dirlist *dp)
1465 {
1466
1467         if (dp) {
1468                 free_dir(dp->dp_left);
1469                 free_dir(dp->dp_right);
1470                 free_host(dp->dp_hosts);
1471                 free((caddr_t)dp);
1472         }
1473 }
1474
1475 /*
1476  * Parse the option string and update fields.
1477  * Option arguments may either be -<option>=<value> or
1478  * -<option> <value>
1479  */
1480 int
1481 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp,
1482        int *has_hostp, int *exflagsp, struct ucred *cr)
1483 {
1484         char *cpoptarg, *cpoptend;
1485         char *cp, *endcp, *cpopt, savedc, savedc2;
1486         int allflag, usedarg;
1487
1488         savedc2 = '\0';
1489         cpopt = *cpp;
1490         cpopt++;
1491         cp = *endcpp;
1492         savedc = *cp;
1493         *cp = '\0';
1494         while (cpopt && *cpopt) {
1495                 allflag = 1;
1496                 usedarg = -2;
1497                 if ((cpoptend = strchr(cpopt, ','))) {
1498                         *cpoptend++ = '\0';
1499                         if ((cpoptarg = strchr(cpopt, '=')))
1500                                 *cpoptarg++ = '\0';
1501                 } else {
1502                         if ((cpoptarg = strchr(cpopt, '=')))
1503                                 *cpoptarg++ = '\0';
1504                         else {
1505                                 *cp = savedc;
1506                                 nextfield(&cp, &endcp);
1507                                 **endcpp = '\0';
1508                                 if (endcp > cp && *cp != '-') {
1509                                         cpoptarg = cp;
1510                                         savedc2 = *endcp;
1511                                         *endcp = '\0';
1512                                         usedarg = 0;
1513                                 }
1514                         }
1515                 }
1516                 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) {
1517                         *exflagsp |= MNT_EXRDONLY;
1518                 } else if (cpoptarg && (!strcmp(cpopt, "maproot") ||
1519                     !(allflag = strcmp(cpopt, "mapall")) ||
1520                     !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) {
1521                         usedarg++;
1522                         parsecred(cpoptarg, cr);
1523                         if (allflag == 0) {
1524                                 *exflagsp |= MNT_EXPORTANON;
1525                                 opt_flags |= OP_MAPALL;
1526                         } else
1527                                 opt_flags |= OP_MAPROOT;
1528                 } else if (!strcmp(cpopt, "kerb") || !strcmp(cpopt, "k")) {
1529                         *exflagsp |= MNT_EXKERB;
1530                         opt_flags |= OP_KERB;
1531                 } else if (cpoptarg && (!strcmp(cpopt, "mask") ||
1532                         !strcmp(cpopt, "m"))) {
1533                         if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) {
1534                                 syslog(LOG_ERR, "bad mask: %s", cpoptarg);
1535                                 return (1);
1536                         }
1537                         usedarg++;
1538                         opt_flags |= OP_MASK;
1539                 } else if (cpoptarg && (!strcmp(cpopt, "network") ||
1540                         !strcmp(cpopt, "n"))) {
1541                         if (strchr(cpoptarg, '/') != NULL) {
1542                                 if (debug)
1543                                         fprintf(stderr, "setting OP_MASKLEN\n");
1544                                 opt_flags |= OP_MASKLEN;
1545                         }
1546                         if (grp->gr_type != GT_NULL) {
1547                                 syslog(LOG_ERR, "network/host conflict");
1548                                 return (1);
1549                         } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) {
1550                                 syslog(LOG_ERR, "bad net: %s", cpoptarg);
1551                                 return (1);
1552                         }
1553                         grp->gr_type = GT_NET;
1554                         *has_hostp = 1;
1555                         usedarg++;
1556                         opt_flags |= OP_NET;
1557                 } else if (!strcmp(cpopt, "alldirs")) {
1558                         opt_flags |= OP_ALLDIRS;
1559                 } else if (!strcmp(cpopt, "public")) {
1560                         *exflagsp |= MNT_EXPUBLIC;
1561                 } else if (!strcmp(cpopt, "webnfs")) {
1562                         *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON);
1563                         opt_flags |= OP_MAPALL;
1564                 } else if (cpoptarg && !strcmp(cpopt, "index")) {
1565                         ep->ex_indexfile = strdup(cpoptarg);
1566                 } else if (!strcmp(cpopt, "quiet")) {
1567                         opt_flags |= OP_QUIET;
1568                 } else {
1569                         syslog(LOG_ERR, "bad opt %s", cpopt);
1570                         return (1);
1571                 }
1572                 if (usedarg >= 0) {
1573                         *endcp = savedc2;
1574                         **endcpp = savedc;
1575                         if (usedarg > 0) {
1576                                 *cpp = cp;
1577                                 *endcpp = endcp;
1578                         }
1579                         return (0);
1580                 }
1581                 cpopt = cpoptend;
1582         }
1583         **endcpp = savedc;
1584         return (0);
1585 }
1586
1587 /*
1588  * Translate a character string to the corresponding list of network
1589  * addresses for a hostname.
1590  */
1591 int
1592 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp)
1593 {
1594         struct grouplist *checkgrp;
1595         struct addrinfo *ai, *tai, hints;
1596         int ecode;
1597         char host[NI_MAXHOST];
1598
1599         if (grp->gr_type != GT_NULL) {
1600                 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp);
1601                 return (1);
1602         }
1603         memset(&hints, 0, sizeof hints);
1604         hints.ai_flags = AI_CANONNAME;
1605         hints.ai_protocol = IPPROTO_UDP;
1606         ecode = getaddrinfo(cp, NULL, &hints, &ai);
1607         if (ecode != 0) {
1608                 syslog(LOG_ERR,"can't get address info for host %s", cp);
1609                 return 1;
1610         }
1611         grp->gr_ptr.gt_addrinfo = ai;
1612         while (ai != NULL) {
1613                 if (ai->ai_canonname == NULL) {
1614                         if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host,
1615                             sizeof host, NULL, 0, ninumeric) != 0)
1616                                 strlcpy(host, "?", sizeof(host));
1617                         ai->ai_canonname = strdup(host);
1618                         ai->ai_flags |= AI_CANONNAME;
1619                 }
1620                 if (debug)
1621                         fprintf(stderr, "got host %s\n", ai->ai_canonname);
1622                 /*
1623                  * Sanity check: make sure we don't already have an entry
1624                  * for this host in the grouplist.
1625                  */
1626                 for (checkgrp = tgrp; checkgrp != NULL;
1627                     checkgrp = checkgrp->gr_next) {
1628                         if (checkgrp->gr_type != GT_HOST)
1629                                 continue;
1630                         for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL;
1631                             tai = tai->ai_next) {
1632                                 if (sacmp(tai->ai_addr, ai->ai_addr) != 0)
1633                                         continue;
1634                                 if (debug)
1635                                         fprintf(stderr,
1636                                             "ignoring duplicate host %s\n",
1637                                             ai->ai_canonname);
1638                                 grp->gr_type = GT_IGNORE;
1639                                 return (0);
1640                         }
1641                 }
1642                 ai = ai->ai_next;
1643         }
1644         grp->gr_type = GT_HOST;
1645         return (0);
1646 }
1647
1648 /*
1649  * Free up an exports list component
1650  */
1651 void
1652 free_exp(struct exportlist *ep)
1653 {
1654
1655         if (ep->ex_defdir) {
1656                 free_host(ep->ex_defdir->dp_hosts);
1657                 free((caddr_t)ep->ex_defdir);
1658         }
1659         if (ep->ex_fsdir)
1660                 free(ep->ex_fsdir);
1661         if (ep->ex_indexfile)
1662                 free(ep->ex_indexfile);
1663         free_dir(ep->ex_dirl);
1664         free((caddr_t)ep);
1665 }
1666
1667 /*
1668  * Free hosts.
1669  */
1670 void
1671 free_host(struct hostlist *hp)
1672 {
1673         struct hostlist *hp2;
1674
1675         while (hp) {
1676                 hp2 = hp;
1677                 hp = hp->ht_next;
1678                 free((caddr_t)hp2);
1679         }
1680 }
1681
1682 struct hostlist *
1683 get_ht(void)
1684 {
1685         struct hostlist *hp;
1686
1687         hp = (struct hostlist *)malloc(sizeof (struct hostlist));
1688         if (hp == NULL)
1689                 out_of_mem();
1690         hp->ht_next = NULL;
1691         hp->ht_flag = 0;
1692         return (hp);
1693 }
1694
1695 /*
1696  * Out of memory, fatal
1697  */
1698 void
1699 out_of_mem(void)
1700 {
1701
1702         syslog(LOG_ERR, "out of memory");
1703         exit(2);
1704 }
1705
1706 /*
1707  * Do the mount syscall with the update flag to push the export info into
1708  * the kernel.
1709  */
1710 int
1711 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags,
1712          struct ucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb)
1713 {
1714         struct statfs fsb1;
1715         struct sockaddr_storage ss;
1716         struct addrinfo *ai;
1717         char *cp = NULL;
1718         int done;
1719         char savedc = '\0';
1720         union {
1721                 struct ufs_args ua;
1722                 struct iso_args ia;
1723                 struct mfs_args ma;
1724 #ifdef __NetBSD__
1725                 struct msdosfs_args da;
1726                 struct adosfs_args aa;
1727 #endif
1728                 struct ntfs_args na;
1729         } args;
1730
1731         args.ua.fspec = 0;
1732         args.ua.export.ex_flags = exflags;
1733         args.ua.export.ex_anon = *anoncrp;
1734         args.ua.export.ex_indexfile = ep->ex_indexfile;
1735         if (grp->gr_type == GT_HOST)
1736                 ai = grp->gr_ptr.gt_addrinfo;
1737         else
1738                 ai = NULL;
1739         done = FALSE;
1740         while (!done) {
1741                 switch (grp->gr_type) {
1742                 case GT_HOST:
1743                         if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0)
1744                                 goto skip;
1745                         args.ua.export.ex_addr = ai->ai_addr;
1746                         args.ua.export.ex_addrlen = ai->ai_addrlen;
1747                         args.ua.export.ex_masklen = 0;
1748                         break;
1749                 case GT_NET:
1750                         args.ua.export.ex_addr = (struct sockaddr *)
1751                             &grp->gr_ptr.gt_net.nt_net;
1752                         if (args.ua.export.ex_addr->sa_family == AF_INET6 &&
1753                             have_v6 == 0)
1754                                 goto skip;
1755                         args.ua.export.ex_addrlen =
1756                             args.ua.export.ex_addr->sa_len;
1757                         memset(&ss, 0, sizeof ss);
1758                         ss.ss_family = args.ua.export.ex_addr->sa_family;
1759                         ss.ss_len = args.ua.export.ex_addr->sa_len;
1760                         if (allones(&ss, grp->gr_ptr.gt_net.nt_mask) != 0) {
1761                                 syslog(LOG_ERR, "Bad network flag");
1762                                 if (cp)
1763                                         *cp = savedc;
1764                                 return (1);
1765                         }
1766                         args.ua.export.ex_mask = (struct sockaddr *)&ss;
1767                         args.ua.export.ex_masklen = ss.ss_len;
1768                         break;
1769                 case GT_DEFAULT:
1770                         args.ua.export.ex_addr = NULL;
1771                         args.ua.export.ex_addrlen = 0;
1772                         args.ua.export.ex_mask = NULL;
1773                         args.ua.export.ex_masklen = 0;
1774                         break;
1775                 case GT_IGNORE:
1776                         return(0);
1777                         break;
1778                 default:
1779                         syslog(LOG_ERR, "bad grouptype");
1780                         if (cp)
1781                                 *cp = savedc;
1782                         return (1);
1783                 }
1784
1785                 /*
1786                  * XXX:
1787                  * Maybe I should just use the fsb->f_mntonname path instead
1788                  * of looping back up the dirp to the mount point??
1789                  * Also, needs to know how to export all types of local
1790                  * exportable file systems and not just "ufs".
1791                  */
1792                 for (;;) {
1793                         int r;
1794
1795                         r = mountctl(fsb->f_mntonname, MOUNTCTL_SET_EXPORT,
1796                                      -1,
1797                                      &args.ua.export, sizeof(args.ua.export),
1798                                      NULL, 0);
1799                         if (r < 0 && errno == EOPNOTSUPP) {
1800                                 r = mount(fsb->f_fstypename, dirp,
1801                                           fsb->f_flags | MNT_UPDATE,
1802                                           (caddr_t)&args);
1803                         }
1804                         if (r >= 0)
1805                                 break;
1806                         if (cp)
1807                                 *cp-- = savedc;
1808                         else
1809                                 cp = dirp + dirplen - 1;
1810                         if (opt_flags & OP_QUIET)
1811                                 return (1);
1812                         if (errno == EPERM) {
1813                                 if (debug)
1814                                         warnx("can't change attributes for %s",
1815                                             dirp);
1816                                 syslog(LOG_ERR,
1817                                    "can't change attributes for %s", dirp);
1818                                 return (1);
1819                         }
1820                         if (opt_flags & OP_ALLDIRS) {
1821                                 if (errno == EINVAL)
1822                                         syslog(LOG_ERR,
1823                 "-alldirs requested but %s is not a filesystem mountpoint",
1824                                                 dirp);
1825                                 else
1826                                         syslog(LOG_ERR,
1827                                                 "could not remount %s: %m",
1828                                                 dirp);
1829                                 return (1);
1830                         }
1831                         /* back up over the last component */
1832                         while (*cp == '/' && cp > dirp)
1833                                 cp--;
1834                         while (*(cp - 1) != '/' && cp > dirp)
1835                                 cp--;
1836                         if (cp == dirp) {
1837                                 if (debug)
1838                                         warnx("mnt unsucc");
1839                                 syslog(LOG_ERR, "can't export %s", dirp);
1840                                 return (1);
1841                         }
1842                         savedc = *cp;
1843                         *cp = '\0';
1844                         /* Check that we're still on the same filesystem. */
1845                         if (statfs(dirp, &fsb1) != 0 || bcmp(&fsb1.f_fsid,
1846                             &fsb->f_fsid, sizeof(fsb1.f_fsid)) != 0) {
1847                                 *cp = savedc;
1848                                 syslog(LOG_ERR, "can't export %s", dirp);
1849                                 return (1);
1850                         }
1851                 }
1852 skip:
1853                 if (ai != NULL)
1854                         ai = ai->ai_next;
1855                 if (ai == NULL)
1856                         done = TRUE;
1857         }
1858         if (cp)
1859                 *cp = savedc;
1860         return (0);
1861 }
1862
1863 /*
1864  * Translate a net address.
1865  */
1866 int
1867 get_net(char *cp, struct netmsk *net, int maskflg)
1868 {
1869         struct netent *np;
1870         char *name, *p, *prefp;
1871         struct sockaddr_in sin, *sinp;
1872         struct sockaddr *sa;
1873         struct addrinfo hints, *ai = NULL;
1874         char netname[NI_MAXHOST];
1875         long preflen;
1876         int ecode;
1877
1878         p = prefp = NULL;
1879         if ((opt_flags & OP_MASKLEN) && !maskflg) {
1880                 p = strchr(cp, '/');
1881                 *p = '\0';
1882                 prefp = p + 1;
1883         }
1884
1885         if ((np = getnetbyname(cp)) != NULL) {
1886                 sin.sin_family = AF_INET;
1887                 sin.sin_len = sizeof sin;
1888                 sin.sin_addr = inet_makeaddr(np->n_net, 0);
1889                 sa = (struct sockaddr *)&sin;
1890         } else if (isdigit(*cp)) {
1891                 memset(&hints, 0, sizeof hints);
1892                 hints.ai_family = AF_UNSPEC;
1893                 hints.ai_flags = AI_NUMERICHOST;
1894                 if (getaddrinfo(cp, NULL, &hints, &ai) != 0) {
1895                         /*
1896                          * If getaddrinfo() failed, try the inet4 network
1897                          * notation with less than 3 dots.
1898                          */
1899                         sin.sin_family = AF_INET;
1900                         sin.sin_len = sizeof sin;
1901                         sin.sin_addr = inet_makeaddr(inet_network(cp),0);
1902                         if (debug)
1903                                 fprintf(stderr, "get_net: v4 addr %x\n",
1904                                     sin.sin_addr.s_addr);
1905                         sa = (struct sockaddr *)&sin;
1906                 } else
1907                         sa = ai->ai_addr;
1908         } else if (isxdigit(*cp) || *cp == ':') {
1909                 memset(&hints, 0, sizeof hints);
1910                 hints.ai_family = AF_UNSPEC;
1911                 hints.ai_flags = AI_NUMERICHOST;
1912                 if (getaddrinfo(cp, NULL, &hints, &ai) == 0)
1913                         sa = ai->ai_addr;
1914                 else
1915                         goto fail;
1916         } else
1917                 goto fail;
1918
1919         ecode = getnameinfo(sa, sa->sa_len, netname, sizeof netname,
1920             NULL, 0, ninumeric);
1921         if (ecode != 0)
1922                 goto fail;
1923
1924         if (maskflg)
1925                 net->nt_mask = countones(sa);
1926         else {
1927                 if (opt_flags & OP_MASKLEN) {
1928                         preflen = strtol(prefp, NULL, 10);
1929                         if (preflen == LONG_MIN && errno == ERANGE)
1930                                 goto fail;
1931                         net->nt_mask = (int)preflen;
1932                         *p = '/';
1933                 }
1934
1935                 if (np)
1936                         name = np->n_name;
1937                 else {
1938                         if (getnameinfo(sa, sa->sa_len, netname, sizeof netname,
1939                            NULL, 0, ninumeric) != 0)
1940                                 strlcpy(netname, "?", sizeof(netname));
1941                         name = netname;
1942                 }
1943                 net->nt_name = strdup(name);
1944                 memcpy(&net->nt_net, sa, sa->sa_len);
1945         }
1946
1947         if (!maskflg && sa->sa_family == AF_INET &&
1948             !(opt_flags & (OP_MASK|OP_MASKLEN))) {
1949                 sinp = (struct sockaddr_in *)sa;
1950                 if (IN_CLASSA(sinp->sin_addr.s_addr))
1951                         net->nt_mask = 8;
1952                 else if (IN_CLASSB(sinp->sin_addr.s_addr))
1953                         net->nt_mask = 16;
1954                 else if (IN_CLASSC(sinp->sin_addr.s_addr))
1955                         net->nt_mask = 24;
1956                 else if (IN_CLASSD(sinp->sin_addr.s_addr))
1957                         net->nt_mask = 28;
1958                 else
1959                         net->nt_mask = 32;       /* XXX */
1960         }
1961
1962         if (ai)
1963                 freeaddrinfo(ai);
1964         return 0;
1965
1966 fail:
1967         if (ai)
1968                 freeaddrinfo(ai);
1969         return 1;
1970 }
1971
1972 /*
1973  * Parse out the next white space separated field
1974  */
1975 void
1976 nextfield(char **cp, char **endcp)
1977 {
1978         char *p;
1979
1980         p = *cp;
1981         while (*p == ' ' || *p == '\t')
1982                 p++;
1983         if (*p == '\n' || *p == '\0')
1984                 *cp = *endcp = p;
1985         else {
1986                 *cp = p++;
1987                 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
1988                         p++;
1989                 *endcp = p;
1990         }
1991 }
1992
1993 /*
1994  * Get an exports file line. Skip over blank lines and handle line
1995  * continuations.
1996  */
1997 int
1998 get_line(void)
1999 {
2000         char *p, *cp;
2001         int len;
2002         int totlen, cont_line;
2003
2004         /*
2005          * Loop around ignoring blank lines and getting all continuation lines.
2006          */
2007         p = line;
2008         totlen = 0;
2009         do {
2010                 if (fgets(p, LINESIZ - totlen, exp_file) == NULL)
2011                         return (0);
2012                 len = strlen(p);
2013                 cp = p + len - 1;
2014                 cont_line = 0;
2015                 while (cp >= p &&
2016                     (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) {
2017                         if (*cp == '\\')
2018                                 cont_line = 1;
2019                         cp--;
2020                         len--;
2021                 }
2022                 if (cont_line) {
2023                         *++cp = ' ';
2024                         len++;
2025                 }
2026                 *++cp = '\0';
2027                 if (len > 0) {
2028                         totlen += len;
2029                         if (totlen >= LINESIZ) {
2030                                 syslog(LOG_ERR, "exports line too long");
2031                                 exit(2);
2032                         }
2033                         p = cp;
2034                 }
2035         } while (totlen == 0 || cont_line);
2036         return (1);
2037 }
2038
2039 /*
2040  * Parse a description of a credential.
2041  */
2042 void
2043 parsecred(char *namelist, struct ucred *cr)
2044 {
2045         char *name;
2046         int cnt;
2047         char *names;
2048         struct passwd *pw;
2049         struct group *gr;
2050         int ngroups, groups[NGROUPS + 1];
2051
2052         /*
2053          * Set up the unprivileged user.
2054          */
2055         cr->cr_ref = 1;
2056         cr->cr_uid = -2;
2057         cr->cr_groups[0] = -2;
2058         cr->cr_ngroups = 1;
2059         /*
2060          * Get the user's password table entry.
2061          */
2062         names = strsep(&namelist, " \t\n");
2063         name = strsep(&names, ":");
2064         if (isdigit(*name) || *name == '-')
2065                 pw = getpwuid(atoi(name));
2066         else
2067                 pw = getpwnam(name);
2068         /*
2069          * Credentials specified as those of a user.
2070          */
2071         if (names == NULL) {
2072                 if (pw == NULL) {
2073                         syslog(LOG_ERR, "unknown user: %s", name);
2074                         return;
2075                 }
2076                 cr->cr_uid = pw->pw_uid;
2077                 ngroups = NGROUPS + 1;
2078                 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups))
2079                         syslog(LOG_ERR, "too many groups");
2080                 /*
2081                  * Convert from int's to gid_t's and compress out duplicate
2082                  */
2083                 cr->cr_ngroups = ngroups - 1;
2084                 cr->cr_groups[0] = groups[0];
2085                 for (cnt = 2; cnt < ngroups; cnt++)
2086                         cr->cr_groups[cnt - 1] = groups[cnt];
2087                 return;
2088         }
2089         /*
2090          * Explicit credential specified as a colon separated list:
2091          *      uid:gid:gid:...
2092          */
2093         if (pw != NULL)
2094                 cr->cr_uid = pw->pw_uid;
2095         else if (isdigit(*name) || *name == '-')
2096                 cr->cr_uid = atoi(name);
2097         else {
2098                 syslog(LOG_ERR, "unknown user: %s", name);
2099                 return;
2100         }
2101         cr->cr_ngroups = 0;
2102         while (names != NULL && *names != '\0' && cr->cr_ngroups < NGROUPS) {
2103                 name = strsep(&names, ":");
2104                 if (isdigit(*name) || *name == '-') {
2105                         cr->cr_groups[cr->cr_ngroups++] = atoi(name);
2106                 } else {
2107                         if ((gr = getgrnam(name)) == NULL) {
2108                                 syslog(LOG_ERR, "unknown group: %s", name);
2109                                 continue;
2110                         }
2111                         cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid;
2112                 }
2113         }
2114         if (names != NULL && *names != '\0' && cr->cr_ngroups == NGROUPS)
2115                 syslog(LOG_ERR, "too many groups");
2116 }
2117
2118 #define STRSIZ  (RPCMNT_NAMELEN+RPCMNT_PATHLEN+50)
2119 /*
2120  * Routines that maintain the remote mounttab
2121  */
2122 void
2123 get_mountlist(void)
2124 {
2125         struct mountlist *mlp, **mlpp;
2126         char *host, *dirp, *cp;
2127         char str[STRSIZ];
2128         FILE *mlfile;
2129
2130         if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) {
2131                 if (errno == ENOENT)
2132                         return;
2133                 else {
2134                         syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST);
2135                         return;
2136                 }
2137         }
2138         mlpp = &mlhead;
2139         while (fgets(str, STRSIZ, mlfile) != NULL) {
2140                 cp = str;
2141                 host = strsep(&cp, " \t\n");
2142                 dirp = strsep(&cp, " \t\n");
2143                 if (host == NULL || dirp == NULL)
2144                         continue;
2145                 mlp = (struct mountlist *)malloc(sizeof (*mlp));
2146                 if (mlp == NULL)
2147                         out_of_mem();
2148                 strncpy(mlp->ml_host, host, RPCMNT_NAMELEN);
2149                 mlp->ml_host[RPCMNT_NAMELEN] = '\0';
2150                 strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN);
2151                 mlp->ml_dirp[RPCMNT_PATHLEN] = '\0';
2152                 mlp->ml_next = NULL;
2153                 *mlpp = mlp;
2154                 mlpp = &mlp->ml_next;
2155         }
2156         fclose(mlfile);
2157 }
2158
2159 void
2160 del_mlist(char *hostp, char *dirp)
2161 {
2162         struct mountlist *mlp, **mlpp;
2163         struct mountlist *mlp2;
2164         FILE *mlfile;
2165         int fnd = 0;
2166
2167         mlpp = &mlhead;
2168         mlp = mlhead;
2169         while (mlp) {
2170                 if (!strcmp(mlp->ml_host, hostp) &&
2171                     (!dirp || !strcmp(mlp->ml_dirp, dirp))) {
2172                         fnd = 1;
2173                         mlp2 = mlp;
2174                         *mlpp = mlp = mlp->ml_next;
2175                         free((caddr_t)mlp2);
2176                 } else {
2177                         mlpp = &mlp->ml_next;
2178                         mlp = mlp->ml_next;
2179                 }
2180         }
2181         if (fnd) {
2182                 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) {
2183                         syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST);
2184                         return;
2185                 }
2186                 mlp = mlhead;
2187                 while (mlp) {
2188                         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
2189                         mlp = mlp->ml_next;
2190                 }
2191                 fclose(mlfile);
2192         }
2193 }
2194
2195 void
2196 add_mlist(char *hostp, char *dirp)
2197 {
2198         struct mountlist *mlp, **mlpp;
2199         FILE *mlfile;
2200
2201         mlpp = &mlhead;
2202         mlp = mlhead;
2203         while (mlp) {
2204                 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp))
2205                         return;
2206                 mlpp = &mlp->ml_next;
2207                 mlp = mlp->ml_next;
2208         }
2209         mlp = (struct mountlist *)malloc(sizeof (*mlp));
2210         if (mlp == NULL)
2211                 out_of_mem();
2212         strncpy(mlp->ml_host, hostp, RPCMNT_NAMELEN);
2213         mlp->ml_host[RPCMNT_NAMELEN] = '\0';
2214         strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN);
2215         mlp->ml_dirp[RPCMNT_PATHLEN] = '\0';
2216         mlp->ml_next = NULL;
2217         *mlpp = mlp;
2218         if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
2219                 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST);
2220                 return;
2221         }
2222         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
2223         fclose(mlfile);
2224 }
2225
2226 /*
2227  * Free up a group list.
2228  */
2229 void
2230 free_grp(struct grouplist *grp)
2231 {
2232         if (grp->gr_type == GT_HOST) {
2233                 if (grp->gr_ptr.gt_addrinfo != NULL)
2234                         freeaddrinfo(grp->gr_ptr.gt_addrinfo);
2235         } else if (grp->gr_type == GT_NET) {
2236                 if (grp->gr_ptr.gt_net.nt_name)
2237                         free(grp->gr_ptr.gt_net.nt_name);
2238         }
2239         free((caddr_t)grp);
2240 }
2241
2242 #ifdef DEBUG
2243 void
2244 SYSLOG(int pri, const char *fmt, ...)
2245 {
2246         va_list ap;
2247
2248         va_start(ap, fmt);
2249         vfprintf(stderr, fmt, ap);
2250         va_end(ap);
2251 }
2252 #endif /* DEBUG */
2253
2254 /*
2255  * Check options for consistency.
2256  */
2257 int
2258 check_options(struct dirlist *dp)
2259 {
2260
2261         if (dp == NULL)
2262             return (1);
2263         if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL) ||
2264             (opt_flags & (OP_MAPROOT | OP_KERB)) == (OP_MAPROOT | OP_KERB) ||
2265             (opt_flags & (OP_MAPALL | OP_KERB)) == (OP_MAPALL | OP_KERB)) {
2266             syslog(LOG_ERR, "-mapall, -maproot and -kerb mutually exclusive");
2267             return (1);
2268         }
2269         if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) {
2270                 syslog(LOG_ERR, "-mask requires -network");
2271                 return (1);
2272         }
2273         if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
2274             syslog(LOG_ERR, "-alldirs has multiple directories");
2275             return (1);
2276         }
2277         return (0);
2278 }
2279
2280 /*
2281  * Check an absolute directory path for any symbolic links. Return true
2282  */
2283 int
2284 check_dirpath(char *dirp)
2285 {
2286         char *cp;
2287         int ret = 1;
2288         struct stat sb;
2289
2290         cp = dirp + 1;
2291         while (*cp && ret) {
2292                 if (*cp == '/') {
2293                         *cp = '\0';
2294                         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
2295                                 ret = 0;
2296                         *cp = '/';
2297                 }
2298                 cp++;
2299         }
2300         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
2301                 ret = 0;
2302         return (ret);
2303 }
2304
2305 static int
2306 netpartcmp(struct sockaddr *s1, struct sockaddr *s2, int bitlen)
2307 {
2308         void *src, *dst;
2309
2310         if (s1->sa_family != s2->sa_family)
2311                 return 1;
2312
2313         switch (s1->sa_family) {
2314         case AF_INET:
2315                 src = &((struct sockaddr_in *)s1)->sin_addr;
2316                 dst = &((struct sockaddr_in *)s2)->sin_addr;
2317                 if (bitlen > sizeof(((struct sockaddr_in *)s1)->sin_addr) * 8)
2318                         return 1;
2319                 break;
2320         case AF_INET6:
2321                 src = &((struct sockaddr_in6 *)s1)->sin6_addr;
2322                 dst = &((struct sockaddr_in6 *)s2)->sin6_addr;
2323                 if (((struct sockaddr_in6 *)s1)->sin6_scope_id !=
2324                    ((struct sockaddr_in6 *)s2)->sin6_scope_id)
2325                         return 1;
2326                 if (bitlen > sizeof(((struct sockaddr_in6 *)s1)->sin6_addr) * 8)
2327                         return 1;
2328                 break;
2329         default:
2330                 return 1;
2331         }
2332
2333         return bitcmp(src, dst, bitlen);
2334 }
2335
2336 static int
2337 allones(struct sockaddr_storage *ssp, int bitlen)
2338 {
2339         u_int8_t *p;
2340         int bytelen, bitsleft, i;
2341         int zerolen;
2342
2343         switch (ssp->ss_family) {
2344         case AF_INET:
2345                 p = (u_int8_t *)&((struct sockaddr_in *)ssp)->sin_addr;
2346                 zerolen = sizeof (((struct sockaddr_in *)ssp)->sin_addr);
2347                 break;
2348         case AF_INET6:
2349                 p = (u_int8_t *)&((struct sockaddr_in6 *)ssp)->sin6_addr;
2350                 zerolen = sizeof (((struct sockaddr_in6 *)ssp)->sin6_addr);
2351         break;
2352         default:
2353                 return -1;
2354         }
2355
2356         memset(p, 0, zerolen);
2357
2358         bytelen = bitlen / 8;
2359         bitsleft = bitlen % 8;
2360
2361         if (bytelen > zerolen)
2362                 return -1;
2363
2364         for (i = 0; i < bytelen; i++)
2365                 *p++ = 0xff;
2366
2367         for (i = 0; i < bitsleft; i++)
2368                 *p |= 1 << (7 - i);
2369
2370         return 0;
2371 }
2372
2373 static int
2374 countones(struct sockaddr *sa)
2375 {
2376         void *mask;
2377         int i, bits = 0, bytelen;
2378         u_int8_t *p;
2379
2380         switch (sa->sa_family) {
2381         case AF_INET:
2382                 mask = (u_int8_t *)&((struct sockaddr_in *)sa)->sin_addr;
2383                 bytelen = 4;
2384                 break;
2385         case AF_INET6:
2386                 mask = (u_int8_t *)&((struct sockaddr_in6 *)sa)->sin6_addr;
2387                 bytelen = 16;
2388                 break;
2389         default:
2390                 return 0;
2391         }
2392
2393         p = mask;
2394
2395         for (i = 0; i < bytelen; i++, p++) {
2396                 if (*p != 0xff) {
2397                         for (bits = 0; bits < 8; bits++) {
2398                                 if (!(*p & (1 << (7 - bits))))
2399                                         break;
2400                         }
2401                         break;
2402                 }
2403         }
2404
2405         return (i * 8 + bits);
2406 }
2407
2408 static int
2409 sacmp(struct sockaddr *sa1, struct sockaddr *sa2)
2410 {
2411         void *p1, *p2;
2412         int len;
2413
2414         if (sa1->sa_family != sa2->sa_family)
2415                 return 1;
2416
2417         switch (sa1->sa_family) {
2418         case AF_INET:
2419                 p1 = &((struct sockaddr_in *)sa1)->sin_addr;
2420                 p2 = &((struct sockaddr_in *)sa2)->sin_addr;
2421                 len = 4;
2422                 break;
2423         case AF_INET6:
2424                 p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr;
2425                 p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr;
2426                 len = 16;
2427                 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
2428                     ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
2429                         return 1;
2430                 break;
2431         default:
2432                 return 1;
2433         }
2434
2435         return memcmp(p1, p2, len);
2436 }
2437
2438 void
2439 huphandler(int sig)
2440 {
2441         got_sighup = 1;
2442 }
2443
2444 void terminate(int sig)
2445 {
2446         pidfile_remove(pfh);
2447         rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL);
2448         rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL);
2449         exit (0);
2450 }