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