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