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: head/usr.sbin/mountd/mountd.c 173056 2007-10-27 12:24:47Z simon $
  35  */
  36
  37 #include <sys/param.h>
  38 #include <sys/module.h>
  39 #include <sys/mount.h>
  40 #include <sys/mountctl.h>
  41 #include <sys/fcntl.h>
  42 #include <sys/linker.h>
  43 #include <sys/stat.h>
  44 #include <sys/syslog.h>
  45 #include <sys/sysctl.h>
  46
  47 #include <rpc/rpc.h>
  48 #include <rpc/rpc_com.h>
  49 #include <rpcsvc/mount.h>
  50 #include <vfs/nfs/rpcv2.h>
  51 #include <vfs/nfs/nfsproto.h>
  52 #include <vfs/nfs/nfs.h>
  53 #include <vfs/ufs/ufsmount.h>
  54 #include <vfs/msdosfs/msdosfsmount.h>
  55 #include <vfs/ntfs/ntfsmount.h>
  56 #include <vfs/isofs/cd9660/cd9660_mount.h>      /* XXX need isofs in include */
  57
  58 #include <arpa/inet.h>
  59
  60 #include <ctype.h>
  61 #include <err.h>
  62 #include <errno.h>
  63 #include <grp.h>
  64 #include <limits.h>
  65 #include <libutil.h>
  66 #include <netdb.h>
  67 #include <pwd.h>
  68 #include <signal.h>
  69 #include <stdio.h>
  70 #include <stdlib.h>
  71 #include <string.h>
  72 #include <unistd.h>
  73 #include "pathnames.h"
  74
  75 #ifdef DEBUG
  76 #include <stdarg.h>
  77 #endif
  78
  79 /*
  80  * Structures for keeping the mount list and export list
  81  */
  82 struct mountlist {
  83         struct mountlist *ml_next;
  84         char    ml_host[RPCMNT_NAMELEN+1];
  85         char    ml_dirp[RPCMNT_PATHLEN+1];
  86 };
  87
  88 struct dirlist {
  89         struct dirlist  *dp_left;
  90         struct dirlist  *dp_right;
  91         int             dp_flag;
  92         struct hostlist *dp_hosts;      /* List of hosts this dir exported to */
  93         char            *dp_dirp;
  94 };
  95 /* dp_flag bits */
  96 #define DP_DEFSET       0x1
  97 #define DP_HOSTSET      0x2
  98
  99 struct exportlist {
 100         struct exportlist *ex_next;
 101         struct dirlist  *ex_dirl;
 102         struct dirlist  *ex_defdir;
 103         int             ex_flag;
 104         fsid_t          ex_fs;
 105         char            *ex_fsdir;
 106         char            *ex_indexfile;
 107 };
 108 /* ex_flag bits */
 109 #define EX_LINKED       0x1
 110
 111 struct netmsk {
 112         struct sockaddr_storage nt_net;
 113         struct sockaddr_storage nt_mask;
 114         char            *nt_name;
 115 };
 116
 117 union grouptypes {
 118         struct addrinfo *gt_addrinfo;
 119         struct netmsk   gt_net;
 120 };
 121
 122 struct grouplist {
 123         int gr_type;
 124         union grouptypes gr_ptr;
 125         struct grouplist *gr_next;
 126 };
 127 /* Group types */
 128 #define GT_NULL         0x0
 129 #define GT_HOST         0x1
 130 #define GT_NET          0x2
 131 #define GT_DEFAULT      0x3
 132 #define GT_IGNORE       0x5
 133
 134 struct hostlist {
 135         int              ht_flag;       /* Uses DP_xx bits */
 136         struct grouplist *ht_grp;
 137         struct hostlist  *ht_next;
 138 };
 139
 140 struct fhreturn {
 141         int     fhr_flag;
 142         int     fhr_vers;
 143         nfsfh_t fhr_fh;
 144 };
 145
 146 /* Global defs */
 147 char    *add_expdir(struct dirlist **, char *, int);
 148 void    add_dlist(struct dirlist **, struct dirlist *,
 149                                 struct grouplist *, int);
 150 void    add_mlist(char *, char *);
 151 int     check_dirpath(char *);
 152 int     check_options(struct dirlist *);
 153 int     checkmask(struct sockaddr *sa);
 154 int     chk_host(struct dirlist *, struct sockaddr *, int *, int *);
 155 void    create_service(struct netconfig *nconf);
 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(int incremental);
 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 static void delete_export(struct statfs *fsp);
 174 int     get_net(char *, struct netmsk *, int);
 175 void    getexp_err(struct exportlist *, struct grouplist *);
 176 struct grouplist *get_grp(void);
 177 void    hang_dirp(struct dirlist *, struct grouplist *,
 178                                 struct exportlist *, int);
 179 void    huphandler1(int sig);
 180 void    huphandler2(int sig);
 181 int     makemask(struct sockaddr_storage *ssp, int bitlen);
 182 void    mntsrv(struct svc_req *, SVCXPRT *);
 183 void    nextfield(char **, char **);
 184 void    out_of_mem(void) __dead2;
 185 void    parsecred(char *, struct ucred *);
 186 int     put_exlist(struct dirlist *, XDR *, struct dirlist *, int *, int);
 187 void    *sa_rawaddr(struct sockaddr *sa, int *nbytes);
 188 int     sacmp(struct sockaddr *sa1, struct sockaddr *sa2,
 189     struct sockaddr *samask);
 190 int     scan_tree(struct dirlist *, struct sockaddr *);
 191 static void usage(void);
 192 int     xdr_dir(XDR *, char *);
 193 int     xdr_explist(XDR *, caddr_t);
 194 int     xdr_explist_brief(XDR *, caddr_t);
 195 int     xdr_explist_common(XDR *, caddr_t, int);
 196 int     xdr_fhs(XDR *, caddr_t);
 197 int     xdr_mlist(XDR *, caddr_t);
 198 void    terminate(int) __dead2;
 199
 200 struct exportlist *exphead;
 201 struct mountlist *mlhead;
 202 struct grouplist *grphead;
 203 char *exnames_default[2] = { _PATH_EXPORTS, NULL };
 204 char **exnames;
 205 char **hosts = NULL;
 206 struct ucred def_anon;
 207 int force_v2 = 0;
 208 int resvport_only = 1;
 209 int nhosts = 0;
 210 int dir_only = 1;
 211 int dolog = 0;
 212 int got_sighup1 = 0;
 213 int got_sighup2 = 0;
 214
 215 int xcreated = 0;
 216 char *svcport_str = NULL;
 217 int opt_flags;
 218 static int have_v6 = 1;
 219
 220 struct pidfh *pfh = NULL;
 221 /* Bits for the opt_flags above */
 222 #define OP_MAPROOT      0x01
 223 #define OP_MAPALL       0x02
 224 /* 0x4 free */
 225 #define OP_MASK         0x08
 226 #define OP_NET          0x10
 227 #define OP_ALLDIRS      0x40
 228 #define OP_HAVEMASK     0x80    /* A mask was specified or inferred. */
 229 #define OP_QUIET        0x100
 230 #define OP_MASKLEN      0x200
 231
 232 #ifdef DEBUG
 233 int debug = 1;
 234 void    SYSLOG(int, const char *, ...);
 235 #define syslog SYSLOG
 236 #else
 237 int debug = 0;
 238 #endif
 239
 240 /*
 241  * Mountd server for NFS mount protocol as described in:
 242  * NFS: Network File System Protocol Specification, RFC1094, Appendix A
 243  * The optional arguments are the exports file name
 244  * default: _PATH_EXPORTS
 245  * and "-n" to allow nonroot mount.
 246  */
 247 int
 248 main(int argc, char **argv)
 249 {
 250         fd_set readfds;
 251         struct netconfig *nconf;
 252         char *endptr, **hosts_bak;
 253         void *nc_handle;
 254         pid_t otherpid;
 255         in_port_t svcport;
 256         int c, k, s;
 257         int maxrec = RPC_MAXDATASIZE;
 258
 259         def_anon.cr_ref = 1;
 260         def_anon.cr_uid = (uid_t)65534;
 261         def_anon.cr_ngroups = 1;
 262         def_anon.cr_groups[0] = (gid_t)65533;
 263
 264         /* Check that another mountd isn't already running. */
 265         pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &otherpid);
 266         if (pfh == NULL) {
 267                 if (errno == EEXIST)
 268                         errx(1, "mountd already running, pid: %d.", otherpid);
 269                 warn("cannot open or create pidfile");
 270         }
 271
 272         s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
 273         if (s < 0)
 274                 have_v6 = 0;
 275         else
 276                 close(s);
 277         if (modfind("nfs") < 0) {
 278                 /* Not present in kernel, try loading it */
 279                 if (kldload("nfs") < 0 || modfind("nfs") < 0)
 280                         errx(1, "NFS server is not available or loadable");
 281         }
 282
 283         while ((c = getopt(argc, argv, "2dh:lnp:r")) != -1) {
 284                 switch (c) {
 285                 case '2':
 286                         force_v2 = 1;
 287                         break;
 288                 case 'n':
 289                         resvport_only = 0;
 290                         break;
 291                 case 'r':
 292                         dir_only = 0;
 293                         break;
 294                 case 'd':
 295                         debug = debug ? 0 : 1;
 296                         break;
 297                 case 'l':
 298                         dolog = 1;
 299                         break;
 300                 case 'p':
 301                         endptr = NULL;
 302                         svcport = (in_port_t)strtoul(optarg, &endptr, 10);
 303                         if (endptr == NULL || *endptr != '\0' ||
 304                             svcport == 0 || svcport >= IPPORT_MAX)
 305                                 usage();
 306                         svcport_str = strdup(optarg);
 307                         break;
 308                 case 'h':
 309                         ++nhosts;
 310                         hosts_bak = hosts;
 311                         hosts_bak = realloc(hosts, nhosts * sizeof(char *));
 312                         if (hosts_bak == NULL) {
 313                                 if (hosts != NULL) {
 314                                         for (k = 0; k < nhosts; k++)
 315                                                 free(hosts[k]);
 316                                         free(hosts);
 317                                         out_of_mem();
 318                                 }
 319                         }
 320                         hosts = hosts_bak;
 321                         hosts[nhosts - 1] = strdup(optarg);
 322                         if (hosts[nhosts - 1] == NULL) {
 323                                 for (k = 0; k < (nhosts - 1); k++)
 324                                         free(hosts[k]);
 325                                 free(hosts);
 326                                 out_of_mem();
 327                         }
 328                         break;
 329                 default:
 330                         usage();
 331                 }
 332         }
 333         if (debug == 0) {
 334                 daemon(0, 0);
 335                 signal(SIGINT, SIG_IGN);
 336                 signal(SIGQUIT, SIG_IGN);
 337         }
 338         argc -= optind;
 339         argv += optind;
 340         grphead = NULL;
 341         exphead = NULL;
 342         mlhead = NULL;
 343         if (argc > 0)
 344                 exnames = argv;
 345         else
 346                 exnames = exnames_default;
 347         openlog("mountd", LOG_PID, LOG_DAEMON);
 348         if (debug)
 349                 warnx("getting export list");
 350         get_exportlist(0);
 351         if (debug)
 352                 warnx("getting mount list");
 353         get_mountlist();
 354         if (debug)
 355                 warnx("here we go");
 356         signal(SIGHUP, huphandler1);
 357         signal(SIGUSR1, huphandler2);
 358         signal(SIGTERM, terminate);
 359         signal(SIGPIPE, SIG_IGN);
 360
 361         pidfile_write(pfh);
 362
 363         rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL);
 364         rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL);
 365
 366         rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);
 367
 368         if (!resvport_only) {
 369                 if (sysctlbyname("vfs.nfs.nfs_privport", NULL, NULL,
 370                         &resvport_only, sizeof(resvport_only)) != 0 &&
 371                     errno != ENOENT) {
 372                         syslog(LOG_ERR, "sysctl: %m");
 373                         exit(1);
 374                 }
 375         }
 376
 377         /*
 378          * If no hosts were specified, add a wildcard entry to bind to
 379          * INADDR_ANY. Otherwise make sure 127.0.0.1 and ::1 are added to the
 380          * list.
 381          */
 382         if (nhosts == 0) {
 383                 hosts = malloc(sizeof(char *));
 384                 if (hosts == NULL)
 385                         out_of_mem();
 386                 hosts[0] = "*";
 387                 nhosts = 1;
 388         } else {
 389                 hosts_bak = hosts;
 390                 if (have_v6) {
 391                         hosts_bak = realloc(hosts, (nhosts + 2) *
 392                             sizeof(char *));
 393                         if (hosts_bak == NULL) {
 394                                 for (k = 0; k < nhosts; k++)
 395                                         free(hosts[k]);
 396                                 free(hosts);
 397                                 out_of_mem();
 398                         } else
 399                                 hosts = hosts_bak;
 400                         nhosts += 2;
 401                         hosts[nhosts - 2] = "::1";
 402                 } else {
 403                         hosts_bak = realloc(hosts, (nhosts + 1) * sizeof(char *));
 404                         if (hosts_bak == NULL) {
 405                                 for (k = 0; k < nhosts; k++)
 406                                         free(hosts[k]);
 407                                 free(hosts);
 408                                 out_of_mem();
 409                         } else {
 410                                 nhosts += 1;
 411                                 hosts = hosts_bak;
 412                         }
 413                 }
 414                 hosts[nhosts - 1] = "127.0.0.1";
 415         }
 416
 417         nc_handle = setnetconfig();
 418         while ((nconf = getnetconfig(nc_handle))) {
 419                 if (nconf->nc_flag & NC_VISIBLE) {
 420                         if (have_v6 == 0 && strcmp(nconf->nc_protofmly,
 421                                 "inet6") == 0) {
 422                                 /* DO NOTHING */
 423                         } else
 424                                 create_service(nconf);
 425                 }
 426         }
 427         endnetconfig(nc_handle);
 428
 429         if (xcreated == 0) {
 430                 syslog(LOG_ERR, "could not create any services");
 431                 exit(1);
 432         }
 433
 434         /* Expand svc_run() here so that we can call get_exportlist(). */
 435         for (;;) {
 436                 if (got_sighup1) {
 437                         got_sighup1 = 0;
 438                         get_exportlist(0);
 439                 }
 440                 if (got_sighup2) {
 441                         got_sighup2 = 0;
 442                         get_exportlist(1);
 443                 }
 444                 readfds = svc_fdset;
 445                 switch (select(svc_maxfd + 1, &readfds, NULL, NULL, NULL)) {
 446                 case -1:
 447                         if (errno == EINTR)
 448                                 continue;
 449                         syslog(LOG_ERR, "mountd died: select: %m");
 450                         exit(1);
 451                 case 0:
 452                         continue;
 453                 default:
 454                         svc_getreqset(&readfds);
 455                 }
 456         }
 457 }
 458
 459 /*
 460  * This routine creates and binds sockets on the appropriate
 461  * addresses. It gets called one time for each transport and
 462  * registrates the service with rpcbind on that transport.
 463  */
 464 void
 465 create_service(struct netconfig *nconf)
 466 {
 467         struct addrinfo hints, *res = NULL;
 468         struct sockaddr_in *sin;
 469         struct sockaddr_in6 *sin6;
 470         struct __rpc_sockinfo si;
 471         struct netbuf servaddr;
 472         SVCXPRT *transp = NULL;
 473         int aicode;
 474         int fd;
 475         int nhostsbak;
 476         int one = 1;
 477         int r;
 478         int registered = 0;
 479         u_int32_t host_addr[4];  /* IPv4 or IPv6 */
 480
 481         if ((nconf->nc_semantics != NC_TPI_CLTS) &&
 482             (nconf->nc_semantics != NC_TPI_COTS) &&
 483             (nconf->nc_semantics != NC_TPI_COTS_ORD))
 484                 return; /* not my type */
 485
 486         /*
 487          * XXX - using RPC library internal functions.
 488          */
 489         if (!__rpc_nconf2sockinfo(nconf, &si)) {
 490                 syslog(LOG_ERR, "cannot get information for %s",
 491                     nconf->nc_netid);
 492                 return;
 493         }
 494
 495         /* Get mountd's address on this transport */
 496         memset(&hints, 0, sizeof hints);
 497         hints.ai_flags = AI_PASSIVE;
 498         hints.ai_family = si.si_af;
 499         hints.ai_socktype = si.si_socktype;
 500         hints.ai_protocol = si.si_proto;
 501
 502         /*
 503          * Bind to specific IPs if asked to
 504          */
 505         nhostsbak = nhosts;
 506         while (nhostsbak > 0) {
 507                 --nhostsbak;
 508                 /*
 509                  * XXX - using RPC library internal functions.
 510                  */
 511                 if ((fd = __rpc_nconf2fd(nconf)) < 0) {
 512                         int non_fatal = 0;
 513                         if (errno == EPROTONOSUPPORT &&
 514                             nconf->nc_semantics != NC_TPI_CLTS)
 515                                 non_fatal = 1;
 516
 517                         syslog(non_fatal ? LOG_DEBUG : LOG_ERR,
 518                             "cannot create socket for %s", nconf->nc_netid);
 519                         return;
 520                 }
 521
 522                 switch (hints.ai_family) {
 523                 case AF_INET:
 524                         if (inet_pton(AF_INET, hosts[nhostsbak],
 525                                 host_addr) == 1) {
 526                                 hints.ai_flags &= AI_NUMERICHOST;
 527                         } else {
 528                                 /*
 529                                  * Skip if we have an AF_INET6 address.
 530                                  */
 531                                 if (inet_pton(AF_INET6, hosts[nhostsbak],
 532                                         host_addr) == 1) {
 533                                         close(fd);
 534                                         continue;
 535                                 }
 536                         }
 537                         break;
 538                 case AF_INET6:
 539                         if (inet_pton(AF_INET6, hosts[nhostsbak],
 540                                 host_addr) == 1) {
 541                                 hints.ai_flags &= AI_NUMERICHOST;
 542                         } else {
 543                                 /*
 544                                  * Skip if we have an AF_INET address.
 545                                  */
 546                                 if (inet_pton(AF_INET, hosts[nhostsbak],
 547                                         host_addr) == 1) {
 548                                         close(fd);
 549                                         continue;
 550                                 }
 551                         }
 552
 553                         /*
 554                          * We're doing host-based access checks here, so don't
 555                          * allow v4-in-v6 to confuse things. The kernel will
 556                          * disable it by default on NFS sockets too.
 557                          */
 558                         if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one,
 559                                 sizeof one) < 0) {
 560                                 syslog(LOG_ERR,
 561                                     "can't disable v4-in-v6 on IPv6 socket");
 562                                 exit(1);
 563                         }
 564                         break;
 565                 default:
 566                         break;
 567                 }
 568
 569                 /*
 570                  * If no hosts were specified, just bind to INADDR_ANY
 571                  */
 572                 if (strcmp("*", hosts[nhostsbak]) == 0) {
 573                         if (svcport_str == NULL) {
 574                                 res = malloc(sizeof(struct addrinfo));
 575                                 if (res == NULL)
 576                                         out_of_mem();
 577                                 res->ai_flags = hints.ai_flags;
 578                                 res->ai_family = hints.ai_family;
 579                                 res->ai_protocol = hints.ai_protocol;
 580
 581                                 switch (res->ai_family) {
 582                                 case AF_INET:
 583                                         sin = malloc(sizeof(struct sockaddr_in));
 584                                         if (sin == NULL)
 585                                                 out_of_mem();
 586                                         sin->sin_family = AF_INET;
 587                                         sin->sin_port = htons(0);
 588                                         sin->sin_addr.s_addr = htonl(INADDR_ANY);
 589                                         res->ai_addr = (struct sockaddr*) sin;
 590                                         res->ai_addrlen = (socklen_t)
 591                                             sizeof(res->ai_addr);
 592                                         break;
 593                                 case AF_INET6:
 594                                         sin6 = malloc(sizeof(struct sockaddr_in6));
 595                                         if (sin6 == NULL)
 596                                                 out_of_mem();
 597                                         sin6->sin6_family = AF_INET6;
 598                                         sin6->sin6_port = htons(0);
 599                                         sin6->sin6_addr = in6addr_any;
 600                                         res->ai_addr = (struct sockaddr*) sin6;
 601                                         res->ai_addrlen = (socklen_t)
 602                                             sizeof(res->ai_addr);
 603                                         break;
 604                                 default:
 605                                         break;
 606                                 }
 607                         } else {
 608                                 if ((aicode = getaddrinfo(NULL, svcport_str,
 609                                             &hints, &res)) != 0) {
 610                                         syslog(LOG_ERR,
 611                                             "cannot get local address for %s: %s",
 612                                             nconf->nc_netid,
 613                                             gai_strerror(aicode));
 614                                         continue;
 615                                 }
 616                         }
 617                 } else {
 618                         if ((aicode = getaddrinfo(hosts[nhostsbak], svcport_str,
 619                                     &hints, &res)) != 0) {
 620                                 syslog(LOG_ERR,
 621                                     "cannot get local address for %s: %s",
 622                                     nconf->nc_netid, gai_strerror(aicode));
 623                                 continue;
 624                         }
 625                 }
 626
 627                 /*
 628                  * Set SO_REUSEADDR only if binding to a specific port
 629                  */
 630                 if (svcport_str) {
 631                         int on = 1;
 632
 633                         setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
 634                                    (char *)&on, sizeof(on));
 635                 }
 636
 637                 r = bindresvport_sa(fd, res->ai_addr);
 638                 if (r != 0) {
 639                         struct sockaddr_in *sin = (void *)res->ai_addr;
 640                         struct sockaddr_in6 *sin6 = (void *)res->ai_addr;
 641                         const char *protostr;
 642                         int portno;
 643
 644                         switch(sin->sin_family) {
 645                         case AF_INET:
 646                                 protostr = "inet";
 647                                 portno = ntohs(sin->sin_port);
 648                                 break;
 649                         case AF_INET6:
 650                                 protostr = "inet6";
 651                                 portno = ntohs(sin6->sin6_port);
 652                                 break;
 653                         default:
 654                                 protostr = "unknown";
 655                                 portno = -1;
 656                                 break;
 657                         }
 658
 659                         syslog(LOG_ERR, "bindresvport_sa: %m proto %s port %d",
 660                                 protostr, portno);
 661                         exit(1);
 662                 }
 663
 664                 if (nconf->nc_semantics != NC_TPI_CLTS)
 665                         listen(fd, SOMAXCONN);
 666
 667                 if (nconf->nc_semantics == NC_TPI_CLTS )
 668                         transp = svc_dg_create(fd, 0, 0);
 669                 else
 670                         transp = svc_vc_create(fd, RPC_MAXDATASIZE,
 671                             RPC_MAXDATASIZE);
 672
 673                 if (transp != NULL) {
 674                         if (!svc_reg(transp, RPCPROG_MNT, RPCMNT_VER1, mntsrv,
 675                                 NULL))
 676                                 syslog(LOG_ERR,
 677                                     "can't register %s RPCMNT_VER1 service",
 678                                     nconf->nc_netid);
 679                         if (!force_v2) {
 680                                 if (!svc_reg(transp, RPCPROG_MNT, RPCMNT_VER3,
 681                                         mntsrv, NULL))
 682                                         syslog(LOG_ERR,
 683                                             "can't register %s RPCMNT_VER3 service",
 684                                             nconf->nc_netid);
 685                         }
 686                 } else
 687                         syslog(LOG_WARNING, "can't create %s services",
 688                             nconf->nc_netid);
 689
 690                 if (registered == 0) {
 691                         registered = 1;
 692                         memset(&hints, 0, sizeof hints);
 693                         hints.ai_flags = AI_PASSIVE;
 694                         hints.ai_family = si.si_af;
 695                         hints.ai_socktype = si.si_socktype;
 696                         hints.ai_protocol = si.si_proto;
 697
 698                         if (svcport_str == NULL) {
 699                                 svcport_str = malloc(NI_MAXSERV * sizeof(char));
 700                                 if (svcport_str == NULL)
 701                                         out_of_mem();
 702
 703                                 if (getnameinfo(res->ai_addr,
 704                                         res->ai_addr->sa_len, NULL, NI_MAXHOST,
 705                                         svcport_str, NI_MAXSERV * sizeof(char),
 706                                         NI_NUMERICHOST | NI_NUMERICSERV))
 707                                         errx(1, "Cannot get port number");
 708                         }
 709
 710                         if((aicode = getaddrinfo(NULL, svcport_str, &hints,
 711                                     &res)) != 0) {
 712                                 syslog(LOG_ERR, "cannot get local address: %s",
 713                                     gai_strerror(aicode));
 714                                 exit(1);
 715                         }
 716
 717                         servaddr.buf = malloc(res->ai_addrlen);
 718                         memcpy(servaddr.buf, res->ai_addr, res->ai_addrlen);
 719                         servaddr.len = res->ai_addrlen;
 720
 721                         rpcb_set(RPCPROG_MNT, RPCMNT_VER1, nconf, &servaddr);
 722                         rpcb_set(RPCPROG_MNT, RPCMNT_VER3, nconf, &servaddr);
 723
 724                         xcreated++;
 725                         freeaddrinfo(res);
 726                 }
 727         } /* end while */
 728 }
 729
 730 static void
 731 usage(void)
 732 {
 733         fprintf(stderr,
 734                 "usage: mountd [-2] [-d] [-l] [-n] [-p <port>] [-r] "
 735                 "[-h <bindip>] [export_file ...]\n");
 736         exit(1);
 737 }
 738
 739 /*
 740  * The mount rpc service
 741  */
 742 void
 743 mntsrv(struct svc_req *rqstp, SVCXPRT *transp)
 744 {
 745         struct exportlist *ep;
 746         struct dirlist *dp;
 747         struct fhreturn fhr;
 748         struct stat stb;
 749         struct statfs fsb;
 750         char host[NI_MAXHOST], numerichost[NI_MAXHOST];
 751         int lookup_failed = 1;
 752         struct sockaddr *saddr;
 753         u_short sport;
 754         char rpcpath[RPCMNT_PATHLEN + 1], dirpath[MAXPATHLEN];
 755         int bad = 0, defset, hostset;
 756         sigset_t sighup_mask;
 757
 758         sigemptyset(&sighup_mask);
 759         sigaddset(&sighup_mask, SIGHUP);
 760
 761         saddr = svc_getrpccaller(transp)->buf;
 762         switch (saddr->sa_family) {
 763         case AF_INET6:
 764                 sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port);
 765                 break;
 766         case AF_INET:
 767                 sport = ntohs(((struct sockaddr_in *)saddr)->sin_port);
 768                 break;
 769         default:
 770                 syslog(LOG_ERR, "request from unknown address family");
 771                 return;
 772         }
 773         lookup_failed = getnameinfo(saddr, saddr->sa_len, host, sizeof host,
 774             NULL, 0, 0);
 775         getnameinfo(saddr, saddr->sa_len, numerichost,
 776             sizeof numerichost, NULL, 0, NI_NUMERICHOST);
 777         switch (rqstp->rq_proc) {
 778         case NULLPROC:
 779                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
 780                         syslog(LOG_ERR, "can't send reply");
 781                 return;
 782         case RPCMNT_MOUNT:
 783                 if (sport >= IPPORT_RESERVED && resvport_only) {
 784                         syslog(LOG_NOTICE,
 785                             "mount request from %s from unprivileged port",
 786                             numerichost);
 787                         svcerr_weakauth(transp);
 788                         return;
 789                 }
 790                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
 791                         syslog(LOG_NOTICE, "undecodable mount request from %s",
 792                             numerichost);
 793                         svcerr_decode(transp);
 794                         return;
 795                 }
 796
 797                 /*
 798                  * Get the real pathname and make sure it is a directory
 799                  * or a regular file if the -r option was specified
 800                  * and it exists.
 801                  */
 802                 if (realpath(rpcpath, dirpath) == NULL ||
 803                     stat(dirpath, &stb) < 0 ||
 804                     (!S_ISDIR(stb.st_mode) &&
 805                     (dir_only || !S_ISREG(stb.st_mode))) ||
 806                     statfs(dirpath, &fsb) < 0) {
 807                         chdir("/");     /* Just in case realpath doesn't */
 808                         syslog(LOG_NOTICE,
 809                             "mount request from %s for non existent path %s",
 810                             numerichost, dirpath);
 811                         if (debug)
 812                                 warnx("stat failed on %s", dirpath);
 813                         bad = ENOENT;   /* We will send error reply later */
 814                 }
 815
 816                 /* Check in the exports list */
 817                 sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
 818                 ep = ex_search(&fsb.f_fsid);
 819                 hostset = defset = 0;
 820                 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset) ||
 821                     ((dp = dirp_search(ep->ex_dirl, dirpath)) &&
 822                       chk_host(dp, saddr, &defset, &hostset)) ||
 823                     (defset && scan_tree(ep->ex_defdir, saddr) == 0 &&
 824                      scan_tree(ep->ex_dirl, saddr) == 0))) {
 825                         if (bad) {
 826                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
 827                                     &bad))
 828                                         syslog(LOG_ERR, "can't send reply");
 829                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 830                                 return;
 831                         }
 832                         if (hostset & DP_HOSTSET)
 833                                 fhr.fhr_flag = hostset;
 834                         else
 835                                 fhr.fhr_flag = defset;
 836                         fhr.fhr_vers = rqstp->rq_vers;
 837                         /* Get the file handle */
 838                         memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t));
 839                         if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) {
 840                                 bad = errno;
 841                                 syslog(LOG_ERR, "can't get fh for %s", dirpath);
 842                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
 843                                     &bad))
 844                                         syslog(LOG_ERR, "can't send reply");
 845                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 846                                 return;
 847                         }
 848                         if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs, &fhr))
 849                                 syslog(LOG_ERR, "can't send reply");
 850                         if (!lookup_failed)
 851                                 add_mlist(host, dirpath);
 852                         else
 853                                 add_mlist(numerichost, dirpath);
 854                         if (debug)
 855                                 warnx("mount successful");
 856                         if (dolog)
 857                                 syslog(LOG_NOTICE,
 858                                     "mount request succeeded from %s for %s",
 859                                     numerichost, dirpath);
 860                 } else {
 861                         bad = EACCES;
 862                         syslog(LOG_NOTICE,
 863                             "mount request denied from %s for %s",
 864                             numerichost, dirpath);
 865                 }
 866
 867                 if (bad && !svc_sendreply(transp, (xdrproc_t)xdr_long, &bad))
 868                         syslog(LOG_ERR, "can't send reply");
 869                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 870                 return;
 871         case RPCMNT_DUMP:
 872                 if (!svc_sendreply(transp, (xdrproc_t)xdr_mlist, NULL))
 873                         syslog(LOG_ERR, "can't send reply");
 874                 else if (dolog)
 875                         syslog(LOG_NOTICE,
 876                             "dump request succeeded from %s",
 877                             numerichost);
 878                 return;
 879         case RPCMNT_UMOUNT:
 880                 if (sport >= IPPORT_RESERVED && resvport_only) {
 881                         syslog(LOG_NOTICE,
 882                             "umount request from %s from unprivileged port",
 883                             numerichost);
 884                         svcerr_weakauth(transp);
 885                         return;
 886                 }
 887                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
 888                         syslog(LOG_NOTICE, "undecodable umount request from %s",
 889                             numerichost);
 890                         svcerr_decode(transp);
 891                         return;
 892                 }
 893                 if (realpath(rpcpath, dirpath) == NULL) {
 894                         syslog(LOG_NOTICE, "umount request from %s "
 895                             "for non existent path %s",
 896                             numerichost, dirpath);
 897                 }
 898                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
 899                         syslog(LOG_ERR, "can't send reply");
 900                 if (!lookup_failed)
 901                         del_mlist(host, dirpath);
 902                 del_mlist(numerichost, dirpath);
 903                 if (dolog)
 904                         syslog(LOG_NOTICE,
 905                             "umount request succeeded from %s for %s",
 906                             numerichost, dirpath);
 907                 return;
 908         case RPCMNT_UMNTALL:
 909                 if (sport >= IPPORT_RESERVED && resvport_only) {
 910                         syslog(LOG_NOTICE,
 911                             "umountall request from %s from unprivileged port",
 912                             numerichost);
 913                         svcerr_weakauth(transp);
 914                         return;
 915                 }
 916                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
 917                         syslog(LOG_ERR, "can't send reply");
 918                 if (!lookup_failed)
 919                         del_mlist(host, NULL);
 920                 del_mlist(numerichost, NULL);
 921                 if (dolog)
 922                         syslog(LOG_NOTICE,
 923                             "umountall request succeeded from %s",
 924                             numerichost);
 925                 return;
 926         case RPCMNT_EXPORT:
 927                 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, NULL))
 928                         if (!svc_sendreply(transp, (xdrproc_t)xdr_explist_brief, NULL))
 929                                 syslog(LOG_ERR, "can't send reply");
 930                 if (dolog)
 931                         syslog(LOG_NOTICE,
 932                             "export request succeeded from %s",
 933                             numerichost);
 934                 return;
 935         default:
 936                 svcerr_noproc(transp);
 937                 return;
 938         }
 939 }
 940
 941 /*
 942  * Xdr conversion for a dirpath string
 943  */
 944 int
 945 xdr_dir(XDR *xdrsp, char *dirp)
 946 {
 947         return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
 948 }
 949
 950 /*
 951  * Xdr routine to generate file handle reply
 952  */
 953 int
 954 xdr_fhs(XDR *xdrsp, caddr_t cp)
 955 {
 956         struct fhreturn *fhrp = (struct fhreturn *)cp;
 957         long ok = 0, len, auth;
 958
 959         if (!xdr_long(xdrsp, &ok))
 960                 return (0);
 961         switch (fhrp->fhr_vers) {
 962         case 1:
 963                 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH));
 964         case 3:
 965                 len = NFSX_V3FH;
 966                 if (!xdr_long(xdrsp, &len))
 967                         return (0);
 968                 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len))
 969                         return (0);
 970                 auth = RPCAUTH_UNIX;
 971                 len = 1;
 972                 if (!xdr_long(xdrsp, &len))
 973                         return (0);
 974                 return (xdr_long(xdrsp, &auth));
 975         }
 976         return (0);
 977 }
 978
 979 int
 980 xdr_mlist(XDR *xdrsp, caddr_t cp __unused)
 981 {
 982         struct mountlist *mlp;
 983         int true = 1;
 984         int false = 0;
 985         char *strp;
 986
 987         mlp = mlhead;
 988         while (mlp) {
 989                 if (!xdr_bool(xdrsp, &true))
 990                         return (0);
 991                 strp = &mlp->ml_host[0];
 992                 if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
 993                         return (0);
 994                 strp = &mlp->ml_dirp[0];
 995                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 996                         return (0);
 997                 mlp = mlp->ml_next;
 998         }
 999         if (!xdr_bool(xdrsp, &false))
1000                 return (0);
1001         return (1);
1002 }
1003
1004 /*
1005  * Xdr conversion for export list
1006  */
1007 int
1008 xdr_explist_common(XDR *xdrsp, caddr_t cp __unused, int brief)
1009 {
1010         struct exportlist *ep;
1011         int false = 0;
1012         int putdef;
1013         sigset_t sighup_mask;
1014
1015         sigemptyset(&sighup_mask);
1016         sigaddset(&sighup_mask, SIGHUP);
1017         sigaddset(&sighup_mask, SIGUSR1);
1018         sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
1019         ep = exphead;
1020         while (ep) {
1021                 putdef = 0;
1022                 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir,
1023                         &putdef, brief))
1024                         goto errout;
1025                 if (ep->ex_defdir && putdef == 0 &&
1026                         put_exlist(ep->ex_defdir, xdrsp, NULL,
1027                             &putdef, brief))
1028                         goto errout;
1029                 ep = ep->ex_next;
1030         }
1031         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1032         if (!xdr_bool(xdrsp, &false))
1033                 return (0);
1034         return (1);
1035 errout:
1036         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1037         return (0);
1038 }
1039
1040 /*
1041  * Called from xdr_explist() to traverse the tree and export the
1042  * directory paths.
1043  */
1044 int
1045 put_exlist(struct dirlist *dp, XDR *xdrsp, struct dirlist *adp, int *putdefp, int brief)
1046 {
1047         struct grouplist *grp;
1048         struct hostlist *hp;
1049         int true = 1;
1050         int false = 0;
1051         int gotalldir = 0;
1052         char *strp;
1053
1054         if (dp) {
1055                 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp, brief))
1056                         return (1);
1057                 if (!xdr_bool(xdrsp, &true))
1058                         return (1);
1059                 strp = dp->dp_dirp;
1060                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
1061                         return (1);
1062                 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) {
1063                         gotalldir = 1;
1064                         *putdefp = 1;
1065                 }
1066                 if (brief) {
1067                         if (!xdr_bool(xdrsp, &true))
1068                                 return (1);
1069                         strp = "(...)";
1070                         if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
1071                                 return (1);
1072                 } else if ((dp->dp_flag & DP_DEFSET) == 0 &&
1073                     (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) {
1074                         hp = dp->dp_hosts;
1075                         while (hp) {
1076                                 grp = hp->ht_grp;
1077                                 if (grp->gr_type == GT_HOST) {
1078                                         if (!xdr_bool(xdrsp, &true))
1079                                                 return (1);
1080                                         strp = grp->gr_ptr.gt_addrinfo->ai_canonname;
1081                                         if (!xdr_string(xdrsp, &strp,
1082                                             RPCMNT_NAMELEN))
1083                                                 return (1);
1084                                 } else if (grp->gr_type == GT_NET) {
1085                                         if (!xdr_bool(xdrsp, &true))
1086                                                 return (1);
1087                                         strp = grp->gr_ptr.gt_net.nt_name;
1088                                         if (!xdr_string(xdrsp, &strp,
1089                                             RPCMNT_NAMELEN))
1090                                                 return (1);
1091                                 }
1092                                 hp = hp->ht_next;
1093                                 if (gotalldir && hp == NULL) {
1094                                         hp = adp->dp_hosts;
1095                                         gotalldir = 0;
1096                                 }
1097                         }
1098                 }
1099                 if (!xdr_bool(xdrsp, &false))
1100                         return (1);
1101                 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp, brief))
1102                         return (1);
1103         }
1104         return (0);
1105 }
1106
1107 int
1108 xdr_explist(XDR *xdrsp, caddr_t cp)
1109 {
1110
1111         return xdr_explist_common(xdrsp, cp, 0);
1112 }
1113
1114 int
1115 xdr_explist_brief(XDR *xdrsp, caddr_t cp)
1116 {
1117
1118         return xdr_explist_common(xdrsp, cp, 1);
1119 }
1120
1121 char *line;
1122 size_t linesize;
1123 FILE *exp_file;
1124
1125 /*
1126  * Get the export list from one, currently open file
1127  */
1128 static void
1129 get_exportlist_one(void)
1130 {
1131         struct exportlist *ep, *ep2;
1132         struct grouplist *grp, *tgrp;
1133         struct exportlist **epp;
1134         struct dirlist *dirhead;
1135         struct statfs fsb;
1136         struct ucred anon;
1137         char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc;
1138         int len, has_host, exflags, got_nondir, dirplen, netgrp;
1139
1140         dirhead = (struct dirlist *)NULL;
1141         while (get_line()) {
1142                 if (debug)
1143                         warnx("got line %s", line);
1144                 cp = line;
1145                 nextfield(&cp, &endcp);
1146                 if (*cp == '#')
1147                         goto nextline;
1148
1149                 /*
1150                  * Set defaults.
1151                  */
1152                 has_host = FALSE;
1153                 anon = def_anon;
1154                 exflags = MNT_EXPORTED;
1155                 got_nondir = 0;
1156                 opt_flags = 0;
1157                 ep = NULL;
1158
1159                 /*
1160                  * Create new exports list entry
1161                  */
1162                 len = endcp-cp;
1163                 tgrp = grp = get_grp();
1164                 while (len > 0) {
1165                         if (len > RPCMNT_NAMELEN) {
1166                             getexp_err(ep, tgrp);
1167                             goto nextline;
1168                         }
1169                         if (*cp == '-') {
1170                             if (ep == NULL) {
1171                                 getexp_err(ep, tgrp);
1172                                 goto nextline;
1173                             }
1174                             if (debug)
1175                                 warnx("doing opt %s", cp);
1176                             got_nondir = 1;
1177                             if (do_opt(&cp, &endcp, ep, grp, &has_host,
1178                                 &exflags, &anon)) {
1179                                 getexp_err(ep, tgrp);
1180                                 goto nextline;
1181                             }
1182                         } else if (*cp == '/') {
1183                             savedc = *endcp;
1184                             *endcp = '\0';
1185                             if (check_dirpath(cp) &&
1186                                 statfs(cp, &fsb) >= 0) {
1187                                 if ((fsb.f_flags & MNT_AUTOMOUNTED) != 0)
1188                                     syslog(LOG_ERR, "Warning: exporting of "
1189                                         "automounted fs %s not supported", cp);
1190                                 if (got_nondir) {
1191                                     syslog(LOG_ERR, "dirs must be first");
1192                                     getexp_err(ep, tgrp);
1193                                     goto nextline;
1194                                 }
1195                                 if (ep) {
1196                                     if (ep->ex_fs.val[0] != fsb.f_fsid.val[0] ||
1197                                         ep->ex_fs.val[1] != fsb.f_fsid.val[1]) {
1198                                         getexp_err(ep, tgrp);
1199                                         goto nextline;
1200                                     }
1201                                 } else {
1202                                     /*
1203                                      * See if this directory is already
1204                                      * in the list.
1205                                      */
1206                                     ep = ex_search(&fsb.f_fsid);
1207                                     if (ep == NULL) {
1208                                         ep = get_exp();
1209                                         ep->ex_fs = fsb.f_fsid;
1210                                         ep->ex_fsdir = strdup(fsb.f_mntonname);
1211                                         if (ep->ex_fsdir == NULL)
1212                                             out_of_mem();
1213
1214                                         delete_export(&fsb);
1215
1216                                         if (debug)
1217                                                 warnx("making new ep fs=0x%x,0x%x",
1218                                                     fsb.f_fsid.val[0],
1219                                                     fsb.f_fsid.val[1]);
1220                                     } else if (debug)
1221                                         warnx("found ep fs=0x%x,0x%x",
1222                                             fsb.f_fsid.val[0],
1223                                             fsb.f_fsid.val[1]);
1224                                 }
1225
1226                                 /*
1227                                  * Add dirpath to export mount point.
1228                                  */
1229                                 dirp = add_expdir(&dirhead, cp, len);
1230                                 dirplen = len;
1231                             } else {
1232                                 getexp_err(ep, tgrp);
1233                                 goto nextline;
1234                             }
1235                             *endcp = savedc;
1236                         } else {
1237                             savedc = *endcp;
1238                             *endcp = '\0';
1239                             got_nondir = 1;
1240                             if (ep == NULL) {
1241                                 getexp_err(ep, tgrp);
1242                                 goto nextline;
1243                             }
1244
1245                             /*
1246                              * Get the host or netgroup.
1247                              */
1248                             setnetgrent(cp);
1249                             netgrp = getnetgrent(&hst, &usr, &dom);
1250                             do {
1251                                 if (has_host) {
1252                                     grp->gr_next = get_grp();
1253                                     grp = grp->gr_next;
1254                                 }
1255                                 if (netgrp) {
1256                                     if (hst == NULL) {
1257                                         syslog(LOG_ERR,
1258                                 "null hostname in netgroup %s, skipping", cp);
1259                                         grp->gr_type = GT_IGNORE;
1260                                     } else if (get_host(hst, grp, tgrp)) {
1261                                         syslog(LOG_ERR,
1262                         "bad host %s in netgroup %s, skipping", hst, cp);
1263                                         grp->gr_type = GT_IGNORE;
1264                                     }
1265                                 } else if (get_host(cp, grp, tgrp)) {
1266                                     syslog(LOG_ERR, "bad host %s, skipping", cp);
1267                                     grp->gr_type = GT_IGNORE;
1268                                 }
1269                                 has_host = TRUE;
1270                             } while (netgrp && getnetgrent(&hst, &usr, &dom));
1271                             endnetgrent();
1272                             *endcp = savedc;
1273                         }
1274                         cp = endcp;
1275                         nextfield(&cp, &endcp);
1276                         len = endcp - cp;
1277                 }
1278                 if (check_options(dirhead)) {
1279                         getexp_err(ep, tgrp);
1280                         goto nextline;
1281                 }
1282                 if (!has_host) {
1283                         grp->gr_type = GT_DEFAULT;
1284                         if (debug)
1285                                 warnx("adding a default entry");
1286
1287                 /*
1288                  * Don't allow a network export coincide with a list of
1289                  * host(s) on the same line.
1290                  */
1291                 } else if ((opt_flags & OP_NET) && tgrp->gr_next) {
1292                         syslog(LOG_ERR, "network/host conflict");
1293                         getexp_err(ep, tgrp);
1294                         goto nextline;
1295
1296                 /*
1297                  * If an export list was specified on this line, make sure
1298                  * that we have at least one valid entry, otherwise skip it.
1299                  */
1300                 } else {
1301                         grp = tgrp;
1302                         while (grp && grp->gr_type == GT_IGNORE)
1303                                 grp = grp->gr_next;
1304                         if (! grp) {
1305                             getexp_err(ep, tgrp);
1306                             goto nextline;
1307                         }
1308                 }
1309
1310                 /*
1311                  * Loop through hosts, pushing the exports into the kernel.
1312                  * After loop, tgrp points to the start of the list and
1313                  * grp points to the last entry in the list.
1314                  */
1315                 grp = tgrp;
1316                 do {
1317                         if (do_mount(ep, grp, exflags, &anon, dirp, dirplen,
1318                             &fsb)) {
1319                                 getexp_err(ep, tgrp);
1320                                 goto nextline;
1321                         }
1322                 } while (grp->gr_next && (grp = grp->gr_next));
1323
1324                 /*
1325                  * Success. Update the data structures.
1326                  */
1327                 if (has_host) {
1328                         hang_dirp(dirhead, tgrp, ep, opt_flags);
1329                         grp->gr_next = grphead;
1330                         grphead = tgrp;
1331                 } else {
1332                         hang_dirp(dirhead, NULL, ep,
1333                                 opt_flags);
1334                         free_grp(grp);
1335                 }
1336                 dirhead = NULL;
1337                 if ((ep->ex_flag & EX_LINKED) == 0) {
1338                         ep2 = exphead;
1339                         epp = &exphead;
1340
1341                         /*
1342                          * Insert in the list in alphabetical order.
1343                          */
1344                         while (ep2 && strcmp(ep2->ex_fsdir, ep->ex_fsdir) < 0) {
1345                                 epp = &ep2->ex_next;
1346                                 ep2 = ep2->ex_next;
1347                         }
1348                         if (ep2)
1349                                 ep->ex_next = ep2;
1350                         *epp = ep;
1351                         ep->ex_flag |= EX_LINKED;
1352                 }
1353 nextline:
1354                 if (dirhead) {
1355                         free_dir(dirhead);
1356                         dirhead = NULL;
1357                 }
1358         }
1359         fclose(exp_file);
1360 }
1361
1362 /*
1363  * Get the export list from all specified files.
1364  *
1365  * If incremental is non-zero we were signalled by mount and we do not
1366  * call mountctl() to blow away existing exports.
1367  */
1368 void
1369 get_exportlist(int incremental)
1370 {
1371         struct exportlist *ep, *ep2;
1372         struct grouplist *grp, *tgrp;
1373         struct statfs *fsp, *mntbufp;
1374         struct vfsconf vfc;
1375         int num, i;
1376         int done;
1377
1378         /*
1379          * First, get rid of the old list
1380          */
1381         ep = exphead;
1382         while (ep) {
1383                 ep2 = ep;
1384                 ep = ep->ex_next;
1385                 free_exp(ep2);
1386         }
1387         exphead = NULL;
1388
1389         grp = grphead;
1390         while (grp) {
1391                 tgrp = grp;
1392                 grp = grp->gr_next;
1393                 free_grp(tgrp);
1394         }
1395         grphead = NULL;
1396
1397         /*
1398          * And delete exports that are in the kernel for all local
1399          * filesystems.
1400          * XXX: Should know how to handle all local exportable filesystems.
1401          */
1402         num = getmntinfo(&mntbufp, MNT_NOWAIT);
1403         for (i = 0; i < num; i++) {
1404                 fsp = &mntbufp[i];
1405                 if (getvfsbyname(fsp->f_fstypename, &vfc) != 0) {
1406                         syslog(LOG_ERR, "getvfsbyname() failed for %s",
1407                             fsp->f_fstypename);
1408                         continue;
1409                 }
1410
1411                 /*
1412                  * Do not delete export for network filesystem by
1413                  * passing "export" arg to mount().
1414                  * It only makes sense to do this for local filesystems.
1415                  */
1416                 if (vfc.vfc_flags & VFCF_NETWORK)
1417                         continue;
1418
1419                 if (incremental == 0)
1420                         delete_export(fsp);
1421         }
1422
1423         /*
1424          * Read in the exports file and build the list, calling
1425          * nmount() as we go along to push the export rules into the kernel.
1426          */
1427         done = 0;
1428         for (i = 0; exnames[i] != NULL; i++) {
1429                 if (debug)
1430                         warnx("reading exports from %s", exnames[i]);
1431                 if ((exp_file = fopen(exnames[i], "r")) == NULL) {
1432                         syslog(LOG_WARNING, "can't open %s", exnames[i]);
1433                         continue;
1434                 }
1435                 get_exportlist_one();
1436                 fclose(exp_file);
1437                 done++;
1438         }
1439         if (done == 0) {
1440                 syslog(LOG_ERR, "can't open any exports file");
1441                 exit(2);
1442         }
1443 }
1444
1445 /*
1446  * Allocate an export list element
1447  */
1448 struct exportlist *
1449 get_exp(void)
1450 {
1451         struct exportlist *ep;
1452
1453         ep = (struct exportlist *)malloc(sizeof (struct exportlist));
1454         if (ep == NULL)
1455                 out_of_mem();
1456         memset(ep, 0, sizeof(struct exportlist));
1457         return (ep);
1458 }
1459
1460 /*
1461  * Allocate a group list element
1462  */
1463 struct grouplist *
1464 get_grp(void)
1465 {
1466         struct grouplist *gp;
1467
1468         gp = (struct grouplist *)malloc(sizeof (struct grouplist));
1469         if (gp == NULL)
1470                 out_of_mem();
1471         memset(gp, 0, sizeof(struct grouplist));
1472         return (gp);
1473 }
1474
1475 /*
1476  * Clean up upon an error in get_exportlist().
1477  */
1478 void
1479 getexp_err(struct exportlist *ep, struct grouplist *grp)
1480 {
1481         struct grouplist *tgrp;
1482
1483         if (!(opt_flags & OP_QUIET))
1484                 syslog(LOG_ERR, "bad exports list line %s", line);
1485         if (ep && (ep->ex_flag & EX_LINKED) == 0)
1486                 free_exp(ep);
1487         while (grp) {
1488                 tgrp = grp;
1489                 grp = grp->gr_next;
1490                 free_grp(tgrp);
1491         }
1492 }
1493
1494 /*
1495  * Search the export list for a matching fs.
1496  */
1497 struct exportlist *
1498 ex_search(fsid_t *fsid)
1499 {
1500         struct exportlist *ep;
1501
1502         ep = exphead;
1503         while (ep) {
1504                 if (ep->ex_fs.val[0] == fsid->val[0] &&
1505                     ep->ex_fs.val[1] == fsid->val[1])
1506                         return (ep);
1507                 ep = ep->ex_next;
1508         }
1509         return (ep);
1510 }
1511
1512 /*
1513  * Add a directory path to the list.
1514  */
1515 char *
1516 add_expdir(struct dirlist **dpp, char *cp, int len)
1517 {
1518         struct dirlist *dp;
1519
1520         dp = malloc(sizeof (struct dirlist));
1521         if (dp == (struct dirlist *)NULL)
1522                 out_of_mem();
1523         dp->dp_left = *dpp;
1524         dp->dp_right = (struct dirlist *)NULL;
1525         dp->dp_flag = 0;
1526         dp->dp_hosts = (struct hostlist *)NULL;
1527         dp->dp_dirp = strndup(cp, len);
1528         if (dp->dp_dirp == NULL)
1529                 out_of_mem();
1530         *dpp = dp;
1531         return (dp->dp_dirp);
1532 }
1533
1534 /*
1535  * Hang the dir list element off the dirpath binary tree as required
1536  * and update the entry for host.
1537  */
1538 void
1539 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep,
1540           int flags)
1541 {
1542         struct hostlist *hp;
1543         struct dirlist *dp2;
1544
1545         if (flags & OP_ALLDIRS) {
1546                 if (ep->ex_defdir)
1547                         free((caddr_t)dp);
1548                 else
1549                         ep->ex_defdir = dp;
1550                 if (grp == NULL) {
1551                         ep->ex_defdir->dp_flag |= DP_DEFSET;
1552                 } else while (grp) {
1553                         hp = get_ht();
1554                         hp->ht_grp = grp;
1555                         hp->ht_next = ep->ex_defdir->dp_hosts;
1556                         ep->ex_defdir->dp_hosts = hp;
1557                         grp = grp->gr_next;
1558                 }
1559         } else {
1560
1561                 /*
1562                  * Loop through the directories adding them to the tree.
1563                  */
1564                 while (dp) {
1565                         dp2 = dp->dp_left;
1566                         add_dlist(&ep->ex_dirl, dp, grp, flags);
1567                         dp = dp2;
1568                 }
1569         }
1570 }
1571
1572 /*
1573  * Traverse the binary tree either updating a node that is already there
1574  * for the new directory or adding the new node.
1575  */
1576 void
1577 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp,
1578           int flags)
1579 {
1580         struct dirlist *dp;
1581         struct hostlist *hp;
1582         int cmp;
1583
1584         dp = *dpp;
1585         if (dp) {
1586                 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp);
1587                 if (cmp > 0) {
1588                         add_dlist(&dp->dp_left, newdp, grp, flags);
1589                         return;
1590                 } else if (cmp < 0) {
1591                         add_dlist(&dp->dp_right, newdp, grp, flags);
1592                         return;
1593                 } else
1594                         free((caddr_t)newdp);
1595         } else {
1596                 dp = newdp;
1597                 dp->dp_left = NULL;
1598                 *dpp = dp;
1599         }
1600         if (grp) {
1601
1602                 /*
1603                  * Hang all of the host(s) off of the directory point.
1604                  */
1605                 do {
1606                         hp = get_ht();
1607                         hp->ht_grp = grp;
1608                         hp->ht_next = dp->dp_hosts;
1609                         dp->dp_hosts = hp;
1610                         grp = grp->gr_next;
1611                 } while (grp);
1612         } else {
1613                 dp->dp_flag |= DP_DEFSET;
1614         }
1615 }
1616
1617 /*
1618  * Search for a dirpath on the export point.
1619  */
1620 struct dirlist *
1621 dirp_search(struct dirlist *dp, char *dirp)
1622 {
1623         int cmp;
1624
1625         if (dp) {
1626                 cmp = strcmp(dp->dp_dirp, dirp);
1627                 if (cmp > 0)
1628                         return (dirp_search(dp->dp_left, dirp));
1629                 else if (cmp < 0)
1630                         return (dirp_search(dp->dp_right, dirp));
1631                 else
1632                         return (dp);
1633         }
1634         return (dp);
1635 }
1636
1637 /*
1638  * Scan for a host match in a directory tree.
1639  */
1640 int
1641 chk_host(struct dirlist *dp, struct sockaddr *saddr, int *defsetp,
1642          int *hostsetp)
1643 {
1644         struct hostlist *hp;
1645         struct grouplist *grp;
1646         struct addrinfo *ai;
1647
1648         if (dp) {
1649                 if (dp->dp_flag & DP_DEFSET)
1650                         *defsetp = dp->dp_flag;
1651                 hp = dp->dp_hosts;
1652                 while (hp) {
1653                         grp = hp->ht_grp;
1654                         switch (grp->gr_type) {
1655                         case GT_HOST:
1656                                 ai = grp->gr_ptr.gt_addrinfo;
1657                                 for (; ai; ai = ai->ai_next) {
1658                                         if (!sacmp(ai->ai_addr, saddr, NULL)) {
1659                                                 *hostsetp =
1660                                                     (hp->ht_flag | DP_HOSTSET);
1661                                                 return (1);
1662                                         }
1663                                 }
1664                                 break;
1665                         case GT_NET:
1666                                 if (!sacmp(saddr, (struct sockaddr *)
1667                                         &grp->gr_ptr.gt_net.nt_net,
1668                                         (struct sockaddr *)
1669                                         &grp->gr_ptr.gt_net.nt_mask)) {
1670                                         *hostsetp = (hp->ht_flag | DP_HOSTSET);
1671                                         return (1);
1672                                 }
1673                                 break;
1674                         }
1675                         hp = hp->ht_next;
1676                 }
1677         }
1678         return (0);
1679 }
1680
1681 /*
1682  * Scan tree for a host that matches the address.
1683  */
1684 int
1685 scan_tree(struct dirlist *dp, struct sockaddr *saddr)
1686 {
1687         int defset, hostset;
1688
1689         if (dp) {
1690                 if (scan_tree(dp->dp_left, saddr))
1691                         return (1);
1692                 if (chk_host(dp, saddr, &defset, &hostset))
1693                         return (1);
1694                 if (scan_tree(dp->dp_right, saddr))
1695                         return (1);
1696         }
1697         return (0);
1698 }
1699
1700 /*
1701  * Traverse the dirlist tree and free it up.
1702  */
1703 void
1704 free_dir(struct dirlist *dp)
1705 {
1706
1707         if (dp) {
1708                 free_dir(dp->dp_left);
1709                 free_dir(dp->dp_right);
1710                 free_host(dp->dp_hosts);
1711                 free(dp->dp_dirp);
1712                 free(dp);
1713         }
1714 }
1715
1716 /*
1717  * Parse the option string and update fields.
1718  * Option arguments may either be -<option>=<value> or
1719  * -<option> <value>
1720  */
1721 int
1722 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp,
1723        int *has_hostp, int *exflagsp, struct ucred *cr)
1724 {
1725         char *cpoptarg, *cpoptend;
1726         char *cp, *endcp, *cpopt, savedc, savedc2;
1727         int allflag, usedarg;
1728
1729         savedc2 = '\0';
1730         cpopt = *cpp;
1731         cpopt++;
1732         cp = *endcpp;
1733         savedc = *cp;
1734         *cp = '\0';
1735         while (cpopt && *cpopt) {
1736                 allflag = 1;
1737                 usedarg = -2;
1738                 if ((cpoptend = strchr(cpopt, ','))) {
1739                         *cpoptend++ = '\0';
1740                         if ((cpoptarg = strchr(cpopt, '=')))
1741                                 *cpoptarg++ = '\0';
1742                 } else {
1743                         if ((cpoptarg = strchr(cpopt, '=')))
1744                                 *cpoptarg++ = '\0';
1745                         else {
1746                                 *cp = savedc;
1747                                 nextfield(&cp, &endcp);
1748                                 **endcpp = '\0';
1749                                 if (endcp > cp && *cp != '-') {
1750                                         cpoptarg = cp;
1751                                         savedc2 = *endcp;
1752                                         *endcp = '\0';
1753                                         usedarg = 0;
1754                                 }
1755                         }
1756                 }
1757                 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) {
1758                         *exflagsp |= MNT_EXRDONLY;
1759                 } else if (cpoptarg && (!strcmp(cpopt, "maproot") ||
1760                     !(allflag = strcmp(cpopt, "mapall")) ||
1761                     !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) {
1762                         usedarg++;
1763                         parsecred(cpoptarg, cr);
1764                         if (allflag == 0) {
1765                                 *exflagsp |= MNT_EXPORTANON;
1766                                 opt_flags |= OP_MAPALL;
1767                         } else
1768                                 opt_flags |= OP_MAPROOT;
1769                 } else if (cpoptarg && (!strcmp(cpopt, "mask") ||
1770                         !strcmp(cpopt, "m"))) {
1771                         if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) {
1772                                 syslog(LOG_ERR, "bad mask: %s", cpoptarg);
1773                                 return (1);
1774                         }
1775                         usedarg++;
1776                         opt_flags |= OP_MASK;
1777                 } else if (cpoptarg && (!strcmp(cpopt, "network") ||
1778                         !strcmp(cpopt, "n"))) {
1779                         if (strchr(cpoptarg, '/') != NULL) {
1780                                 if (debug)
1781                                         fprintf(stderr, "setting OP_MASKLEN\n");
1782                                 opt_flags |= OP_MASKLEN;
1783                         }
1784                         if (grp->gr_type != GT_NULL) {
1785                                 syslog(LOG_ERR, "network/host conflict");
1786                                 return (1);
1787                         } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) {
1788                                 syslog(LOG_ERR, "bad net: %s", cpoptarg);
1789                                 return (1);
1790                         }
1791                         grp->gr_type = GT_NET;
1792                         *has_hostp = 1;
1793                         usedarg++;
1794                         opt_flags |= OP_NET;
1795                 } else if (!strcmp(cpopt, "alldirs")) {
1796                         opt_flags |= OP_ALLDIRS;
1797                 } else if (!strcmp(cpopt, "public")) {
1798                         *exflagsp |= MNT_EXPUBLIC;
1799                 } else if (!strcmp(cpopt, "webnfs")) {
1800                         *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON);
1801                         opt_flags |= OP_MAPALL;
1802                 } else if (cpoptarg && !strcmp(cpopt, "index")) {
1803                         ep->ex_indexfile = strdup(cpoptarg);
1804                 } else if (!strcmp(cpopt, "quiet")) {
1805                         opt_flags |= OP_QUIET;
1806                 } else {
1807                         syslog(LOG_ERR, "bad opt %s", cpopt);
1808                         return (1);
1809                 }
1810                 if (usedarg >= 0) {
1811                         *endcp = savedc2;
1812                         **endcpp = savedc;
1813                         if (usedarg > 0) {
1814                                 *cpp = cp;
1815                                 *endcpp = endcp;
1816                         }
1817                         return (0);
1818                 }
1819                 cpopt = cpoptend;
1820         }
1821         **endcpp = savedc;
1822         return (0);
1823 }
1824
1825 /*
1826  * Translate a character string to the corresponding list of network
1827  * addresses for a hostname.
1828  */
1829 int
1830 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp)
1831 {
1832         struct grouplist *checkgrp;
1833         struct addrinfo *ai, *tai, hints;
1834         int ecode;
1835         char host[NI_MAXHOST];
1836
1837         if (grp->gr_type != GT_NULL) {
1838                 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp);
1839                 return (1);
1840         }
1841         memset(&hints, 0, sizeof hints);
1842         hints.ai_flags = AI_CANONNAME;
1843         hints.ai_protocol = IPPROTO_UDP;
1844         ecode = getaddrinfo(cp, NULL, &hints, &ai);
1845         if (ecode != 0) {
1846                 syslog(LOG_ERR,"can't get address info for host %s", cp);
1847                 return 1;
1848         }
1849         grp->gr_ptr.gt_addrinfo = ai;
1850         while (ai != NULL) {
1851                 if (ai->ai_canonname == NULL) {
1852                         if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host,
1853                             sizeof host, NULL, 0, NI_NUMERICHOST) != 0)
1854                                 strlcpy(host, "?", sizeof(host));
1855                         ai->ai_canonname = strdup(host);
1856                         ai->ai_flags |= AI_CANONNAME;
1857                 }
1858                 if (debug)
1859                         fprintf(stderr, "got host %s\n", ai->ai_canonname);
1860                 /*
1861                  * Sanity check: make sure we don't already have an entry
1862                  * for this host in the grouplist.
1863                  */
1864                 for (checkgrp = tgrp; checkgrp != NULL;
1865                     checkgrp = checkgrp->gr_next) {
1866                         if (checkgrp->gr_type != GT_HOST)
1867                                 continue;
1868                         for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL;
1869                             tai = tai->ai_next) {
1870                                 if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0)
1871                                         continue;
1872                                 if (debug)
1873                                         fprintf(stderr,
1874                                             "ignoring duplicate host %s\n",
1875                                             ai->ai_canonname);
1876                                 grp->gr_type = GT_IGNORE;
1877                                 return (0);
1878                         }
1879                 }
1880                 ai = ai->ai_next;
1881         }
1882         grp->gr_type = GT_HOST;
1883         return (0);
1884 }
1885
1886 /*
1887  * Free up an exports list component
1888  */
1889 void
1890 free_exp(struct exportlist *ep)
1891 {
1892
1893         if (ep->ex_defdir) {
1894                 free_host(ep->ex_defdir->dp_hosts);
1895                 free((caddr_t)ep->ex_defdir);
1896         }
1897         if (ep->ex_fsdir)
1898                 free(ep->ex_fsdir);
1899         if (ep->ex_indexfile)
1900                 free(ep->ex_indexfile);
1901         free_dir(ep->ex_dirl);
1902         free((caddr_t)ep);
1903 }
1904
1905 /*
1906  * Free hosts.
1907  */
1908 void
1909 free_host(struct hostlist *hp)
1910 {
1911         struct hostlist *hp2;
1912
1913         while (hp) {
1914                 hp2 = hp;
1915                 hp = hp->ht_next;
1916                 free((caddr_t)hp2);
1917         }
1918 }
1919
1920 struct hostlist *
1921 get_ht(void)
1922 {
1923         struct hostlist *hp;
1924
1925         hp = (struct hostlist *)malloc(sizeof (struct hostlist));
1926         if (hp == NULL)
1927                 out_of_mem();
1928         hp->ht_next = NULL;
1929         hp->ht_flag = 0;
1930         return (hp);
1931 }
1932
1933 /*
1934  * Out of memory, fatal
1935  */
1936 void
1937 out_of_mem(void)
1938 {
1939
1940         syslog(LOG_ERR, "out of memory");
1941         exit(2);
1942 }
1943
1944 /*
1945  * Do the mount syscall with the update flag to push the export info into
1946  * the kernel.
1947  */
1948 int
1949 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags,
1950          struct ucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb)
1951 {
1952         struct statfs fsb1;
1953         struct addrinfo *ai;
1954         struct export_args *eap;
1955         char *cp = NULL;
1956         int done;
1957         char savedc = '\0';
1958         union {
1959                 struct ufs_args ua;
1960                 struct iso_args ia;
1961                 struct mfs_args ma;
1962                 struct msdosfs_args da;
1963                 struct ntfs_args na;
1964         } args;
1965
1966         bzero(&args, sizeof args);
1967         /* XXX, we assume that all xx_args look like ufs_args. */
1968         args.ua.fspec = 0;
1969         eap = &args.ua.export;
1970
1971         eap->ex_flags = exflags;
1972         eap->ex_anon = *anoncrp;
1973         eap->ex_indexfile = ep->ex_indexfile;
1974         if (grp->gr_type == GT_HOST)
1975                 ai = grp->gr_ptr.gt_addrinfo;
1976         else
1977                 ai = NULL;
1978         done = FALSE;
1979         while (!done) {
1980                 switch (grp->gr_type) {
1981                 case GT_HOST:
1982                         if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0)
1983                                 goto skip;
1984                         eap->ex_addr = ai->ai_addr;
1985                         eap->ex_addrlen = ai->ai_addrlen;
1986                         eap->ex_masklen = 0;
1987                         break;
1988                 case GT_NET:
1989                         if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 &&
1990                             have_v6 == 0)
1991                                 goto skip;
1992                         eap->ex_addr =
1993                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net;
1994                         eap->ex_addrlen = args.ua.export.ex_addr->sa_len;
1995                         eap->ex_mask =
1996                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask;
1997                         eap->ex_masklen = args.ua.export.ex_mask->sa_len;
1998                         break;
1999                 case GT_DEFAULT:
2000                         eap->ex_addr = NULL;
2001                         eap->ex_addrlen = 0;
2002                         eap->ex_mask = NULL;
2003                         eap->ex_masklen = 0;
2004                         break;
2005                 case GT_IGNORE:
2006                         return(0);
2007                         break;
2008                 default:
2009                         syslog(LOG_ERR, "bad grouptype");
2010                         if (cp)
2011                                 *cp = savedc;
2012                         return (1);
2013                 }
2014
2015                 /*
2016                  * XXX:
2017                  * Maybe I should just use the fsb->f_mntonname path instead
2018                  * of looping back up the dirp to the mount point??
2019                  * Also, needs to know how to export all types of local
2020                  * exportable filesystems and not just "ufs".
2021                  */
2022                 for (;;) {
2023                         int r;
2024
2025                         r = mountctl(fsb->f_mntonname, MOUNTCTL_SET_EXPORT,
2026                                      -1,
2027                                      &args.ua.export, sizeof(args.ua.export),
2028                                      NULL, 0);
2029                         if (r < 0 && errno == EOPNOTSUPP) {
2030                                 r = mount(fsb->f_fstypename, dirp,
2031                                           fsb->f_flags | MNT_UPDATE,
2032                                           (caddr_t)&args);
2033                         }
2034                         if (r >= 0)
2035                                 break;
2036                         if (cp)
2037                                 *cp-- = savedc;
2038                         else
2039                                 cp = dirp + dirplen - 1;
2040                         if (opt_flags & OP_QUIET)
2041                                 return (1);
2042                         if (errno == EPERM) {
2043                                 if (debug)
2044                                         warnx("can't change attributes for %s",
2045                                             dirp);
2046                                 syslog(LOG_ERR,
2047                                    "can't change attributes for %s", dirp);
2048                                 return (1);
2049                         }
2050                         if (opt_flags & OP_ALLDIRS) {
2051                                 if (errno == EINVAL)
2052                                         syslog(LOG_ERR,
2053                 "-alldirs requested but %s is not a filesystem mountpoint",
2054                                                 dirp);
2055                                 else
2056                                         syslog(LOG_ERR,
2057                                                 "could not remount %s: %m",
2058                                                 dirp);
2059                                 return (1);
2060                         }
2061                         /* back up over the last component */
2062                         while (*cp == '/' && cp > dirp)
2063                                 cp--;
2064                         while (*(cp - 1) != '/' && cp > dirp)
2065                                 cp--;
2066                         if (cp == dirp) {
2067                                 if (debug)
2068                                         warnx("mnt unsucc");
2069                                 syslog(LOG_ERR, "can't export %s", dirp);
2070                                 return (1);
2071                         }
2072                         savedc = *cp;
2073                         *cp = '\0';
2074                         /* Check that we're still on the same filesystem. */
2075                         if (statfs(dirp, &fsb1) != 0 || bcmp(&fsb1.f_fsid,
2076                             &fsb->f_fsid, sizeof(fsb1.f_fsid)) != 0) {
2077                                 *cp = savedc;
2078                                 syslog(LOG_ERR, "can't export %s", dirp);
2079                                 return (1);
2080                         }
2081                 }
2082 skip:
2083                 if (ai != NULL)
2084                         ai = ai->ai_next;
2085                 if (ai == NULL)
2086                         done = TRUE;
2087         }
2088         if (cp)
2089                 *cp = savedc;
2090         return (0);
2091 }
2092
2093 /*
2094  * Translate a net address.
2095  *
2096  * If `maskflg' is nonzero, then `cp' is a netmask, not a network address.
2097  */
2098 int
2099 get_net(char *cp, struct netmsk *net, int maskflg)
2100 {
2101         struct netent *np = NULL;
2102         char *name, *p, *prefp;
2103         struct sockaddr_in sin;
2104         struct sockaddr *sa = NULL;
2105         struct addrinfo hints, *ai = NULL;
2106         char netname[NI_MAXHOST];
2107         long preflen;
2108
2109         p = prefp = NULL;
2110         if ((opt_flags & OP_MASKLEN) && !maskflg) {
2111                 p = strchr(cp, '/');
2112                 *p = '\0';
2113                 prefp = p + 1;
2114         }
2115
2116         /*
2117          * Check for a numeric address first. We wish to avoid
2118          * possible DNS lookups in getnetbyname().
2119          */
2120         if (isxdigit(*cp) || *cp == ':') {
2121                 memset(&hints, 0, sizeof hints);
2122                 /* Ensure the mask and the network have the same family. */
2123                 if (maskflg && (opt_flags & OP_NET))
2124                         hints.ai_family = net->nt_net.ss_family;
2125                 else if (!maskflg && (opt_flags & OP_HAVEMASK))
2126                         hints.ai_family = net->nt_mask.ss_family;
2127                 else
2128                         hints.ai_family = AF_UNSPEC;
2129                 hints.ai_flags = AI_NUMERICHOST;
2130                 if (getaddrinfo(cp, NULL, &hints, &ai) == 0)
2131                         sa = ai->ai_addr;
2132                 if (sa != NULL && ai->ai_family == AF_INET) {
2133                         /*
2134                          * The address in `cp' is really a network address, so
2135                          * use inet_network() to re-interpret this correctly.
2136                          * e.g. "127.1" means 127.1.0.0, not 127.0.0.1.
2137                          */
2138                         bzero(&sin, sizeof sin);
2139                         sin.sin_family = AF_INET;
2140                         sin.sin_len = sizeof sin;
2141                         sin.sin_addr = inet_makeaddr(inet_network(cp), 0);
2142                         if (debug)
2143                                 fprintf(stderr, "get_net: v4 addr %s\n",
2144                                     inet_ntoa(sin.sin_addr));
2145                         sa = (struct sockaddr *)&sin;
2146                 }
2147         }
2148         if (sa == NULL && (np = getnetbyname(cp)) != NULL) {
2149                 bzero(&sin, sizeof sin);
2150                 sin.sin_family = AF_INET;
2151                 sin.sin_len = sizeof sin;
2152                 sin.sin_addr = inet_makeaddr(np->n_net, 0);
2153                 sa = (struct sockaddr *)&sin;
2154         }
2155         if (sa == NULL)
2156                 goto fail;
2157
2158         if (maskflg) {
2159                 /* The specified sockaddr is a mask. */
2160                 if (checkmask(sa) != 0)
2161                         goto fail;
2162                 bcopy(sa, &net->nt_mask, sa->sa_len);
2163                 opt_flags |= OP_HAVEMASK;
2164         } else {
2165                 /* The specified sockaddr is a network address. */
2166                 bcopy(sa, &net->nt_net, sa->sa_len);
2167
2168                 /* Get a network name for the export list. */
2169                 if (np) {
2170                         name = np->n_name;
2171                 } else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname,
2172                         NULL, 0, NI_NUMERICHOST) == 0) {
2173                         name = netname;
2174                 } else {
2175                         goto fail;
2176                 }
2177                 if ((net->nt_name = strdup(name)) == NULL)
2178                         out_of_mem();
2179
2180                 /*
2181                  * Extract a mask from either a "/<masklen>" suffix, or
2182                  * from the class of an IPv4 address.
2183                  */
2184                 if (opt_flags & OP_MASKLEN) {
2185                         preflen = strtol(prefp, NULL, 10);
2186                         if (preflen < 0L || preflen == LONG_MAX)
2187                                 goto fail;
2188                         bcopy(sa, &net->nt_mask, sa->sa_len);
2189                         if (makemask(&net->nt_mask, (int)preflen) != 0)
2190                                 goto fail;
2191                         opt_flags |= OP_HAVEMASK;
2192                         *p = '/';
2193                 } else if (sa->sa_family == AF_INET &&
2194                     (opt_flags & OP_MASK) == 0) {
2195                         in_addr_t addr;
2196
2197                         addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
2198                         if (IN_CLASSA(addr))
2199                                 preflen = 8;
2200                         else if (IN_CLASSB(addr))
2201                                 preflen = 16;
2202                         else if (IN_CLASSC(addr))
2203                                 preflen = 24;
2204                         else if (IN_CLASSD(addr))
2205                                 preflen = 28;
2206                         else
2207                                 preflen = 32;   /* XXX */
2208
2209                         bcopy(sa, &net->nt_mask, sa->sa_len);
2210                         makemask(&net->nt_mask, (int)preflen);
2211                         opt_flags |= OP_HAVEMASK;
2212                 }
2213         }
2214
2215         if (ai)
2216                 freeaddrinfo(ai);
2217         return 0;
2218
2219 fail:
2220         if (ai)
2221                 freeaddrinfo(ai);
2222         return 1;
2223 }
2224
2225 /*
2226  * Parse out the next white space separated field
2227  */
2228 void
2229 nextfield(char **cp, char **endcp)
2230 {
2231         char *p;
2232
2233         p = *cp;
2234         while (*p == ' ' || *p == '\t')
2235                 p++;
2236         if (*p == '\n' || *p == '\0')
2237                 *cp = *endcp = p;
2238         else {
2239                 *cp = p++;
2240                 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
2241                         p++;
2242                 *endcp = p;
2243         }
2244 }
2245
2246 /*
2247  * Get an exports file line. Skip over blank lines and handle line
2248  * continuations.
2249  */
2250 int
2251 get_line(void)
2252 {
2253         char *p, *cp;
2254         size_t len;
2255         int totlen, cont_line;
2256
2257         /*
2258          * Loop around ignoring blank lines and getting all continuation lines.
2259          */
2260         p = line;
2261         totlen = 0;
2262         do {
2263                 if ((p = fgetln(exp_file, &len)) == NULL)
2264                         return (0);
2265                 cp = p + len - 1;
2266                 cont_line = 0;
2267                 while (cp >= p &&
2268                     (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) {
2269                         if (*cp == '\\')
2270                                 cont_line = 1;
2271                         cp--;
2272                         len--;
2273                 }
2274                 if (cont_line) {
2275                         *++cp = ' ';
2276                         len++;
2277                 }
2278                 if (linesize < len + totlen + 1) {
2279                         linesize = len + totlen + 1;
2280                         line = realloc(line, linesize);
2281                         if (line == NULL)
2282                                 out_of_mem();
2283                 }
2284                 memcpy(line + totlen, p, len);
2285                 totlen += len;
2286                 line[totlen] = '\0';
2287         } while (totlen == 0 || cont_line);
2288         return (1);
2289 }
2290
2291 /*
2292  * Parse a description of a credential.
2293  */
2294 void
2295 parsecred(char *namelist, struct ucred *cr)
2296 {
2297         char *name;
2298         int cnt;
2299         char *names;
2300         struct passwd *pw;
2301         struct group *gr;
2302         gid_t groups[NGROUPS + 1];
2303         int ngroups;
2304
2305         /*
2306          * Set up the unprivileged user.
2307          */
2308         cr->cr_ref = 1;
2309         cr->cr_uid = 65534;
2310         cr->cr_groups[0] = 65533;
2311         cr->cr_ngroups = 1;
2312         /*
2313          * Get the user's password table entry.
2314          */
2315         names = strsep(&namelist, " \t\n");
2316         name = strsep(&names, ":");
2317         if (isdigit(*name) || *name == '-')
2318                 pw = getpwuid(atoi(name));
2319         else
2320                 pw = getpwnam(name);
2321         /*
2322          * Credentials specified as those of a user.
2323          */
2324         if (names == NULL) {
2325                 if (pw == NULL) {
2326                         syslog(LOG_ERR, "unknown user: %s", name);
2327                         return;
2328                 }
2329                 cr->cr_uid = pw->pw_uid;
2330                 ngroups = NGROUPS + 1;
2331                 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups))
2332                         syslog(LOG_ERR, "too many groups");
2333                 /*
2334                  * Compress out duplicate
2335                  */
2336                 cr->cr_ngroups = ngroups - 1;
2337                 cr->cr_groups[0] = groups[0];
2338                 for (cnt = 2; cnt < ngroups; cnt++)
2339                         cr->cr_groups[cnt - 1] = groups[cnt];
2340                 return;
2341         }
2342         /*
2343          * Explicit credential specified as a colon separated list:
2344          *      uid:gid:gid:...
2345          */
2346         if (pw != NULL)
2347                 cr->cr_uid = pw->pw_uid;
2348         else if (isdigit(*name) || *name == '-')
2349                 cr->cr_uid = atoi(name);
2350         else {
2351                 syslog(LOG_ERR, "unknown user: %s", name);
2352                 return;
2353         }
2354         cr->cr_ngroups = 0;
2355         while (names != NULL && *names != '\0' && cr->cr_ngroups < NGROUPS) {
2356                 name = strsep(&names, ":");
2357                 if (isdigit(*name) || *name == '-') {
2358                         cr->cr_groups[cr->cr_ngroups++] = atoi(name);
2359                 } else {
2360                         if ((gr = getgrnam(name)) == NULL) {
2361                                 syslog(LOG_ERR, "unknown group: %s", name);
2362                                 continue;
2363                         }
2364                         cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid;
2365                 }
2366         }
2367         if (names != NULL && *names != '\0' && cr->cr_ngroups == NGROUPS)
2368                 syslog(LOG_ERR, "too many groups");
2369 }
2370
2371 #define STRSIZ  (RPCMNT_NAMELEN+RPCMNT_PATHLEN+50)
2372 /*
2373  * Routines that maintain the remote mounttab
2374  */
2375 void
2376 get_mountlist(void)
2377 {
2378         struct mountlist *mlp, **mlpp;
2379         char *host, *dirp, *cp;
2380         char str[STRSIZ];
2381         FILE *mlfile;
2382
2383         if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) {
2384                 if (errno == ENOENT)
2385                         return;
2386                 else {
2387                         syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST);
2388                         return;
2389                 }
2390         }
2391         mlpp = &mlhead;
2392         while (fgets(str, STRSIZ, mlfile) != NULL) {
2393                 cp = str;
2394                 host = strsep(&cp, " \t\n");
2395                 dirp = strsep(&cp, " \t\n");
2396                 if (host == NULL || dirp == NULL)
2397                         continue;
2398                 mlp = (struct mountlist *)malloc(sizeof (*mlp));
2399                 if (mlp == NULL)
2400                         out_of_mem();
2401                 strncpy(mlp->ml_host, host, RPCMNT_NAMELEN);
2402                 mlp->ml_host[RPCMNT_NAMELEN] = '\0';
2403                 strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN);
2404                 mlp->ml_dirp[RPCMNT_PATHLEN] = '\0';
2405                 mlp->ml_next = NULL;
2406                 *mlpp = mlp;
2407                 mlpp = &mlp->ml_next;
2408         }
2409         fclose(mlfile);
2410 }
2411
2412 static
2413 void
2414 delete_export(struct statfs *fsp)
2415 {
2416         union {
2417                 struct ufs_args ua;
2418                 struct iso_args ia;
2419                 struct mfs_args ma;
2420                 struct msdosfs_args da;
2421                 struct ntfs_args na;
2422         } targs;
2423         struct export_args export;
2424
2425         export.ex_flags = MNT_DELEXPORT;
2426         if (mountctl(fsp->f_mntonname, MOUNTCTL_SET_EXPORT, -1,
2427                      &export, sizeof(export), NULL, 0) == 0) {
2428                 /* ok */
2429         } else if (!strcmp(fsp->f_fstypename, "mfs") ||
2430             !strcmp(fsp->f_fstypename, "ufs") ||
2431             !strcmp(fsp->f_fstypename, "msdos") ||
2432             !strcmp(fsp->f_fstypename, "ntfs") ||
2433             !strcmp(fsp->f_fstypename, "cd9660")) {
2434                 bzero(&targs, sizeof targs);
2435                 targs.ua.fspec = NULL;
2436                 targs.ua.export.ex_flags = MNT_DELEXPORT;
2437                 if (mount(fsp->f_fstypename, fsp->f_mntonname,
2438                           fsp->f_flags | MNT_UPDATE,
2439                           (caddr_t)&targs) < 0)
2440                         syslog(LOG_ERR, "can't delete exports for %s",
2441                             fsp->f_mntonname);
2442         }
2443 }
2444
2445
2446 void
2447 del_mlist(char *hostp, char *dirp)
2448 {
2449         struct mountlist *mlp, **mlpp;
2450         struct mountlist *mlp2;
2451         FILE *mlfile;
2452         int fnd = 0;
2453
2454         mlpp = &mlhead;
2455         mlp = mlhead;
2456         while (mlp) {
2457                 if (!strcmp(mlp->ml_host, hostp) &&
2458                     (!dirp || !strcmp(mlp->ml_dirp, dirp))) {
2459                         fnd = 1;
2460                         mlp2 = mlp;
2461                         *mlpp = mlp = mlp->ml_next;
2462                         free((caddr_t)mlp2);
2463                 } else {
2464                         mlpp = &mlp->ml_next;
2465                         mlp = mlp->ml_next;
2466                 }
2467         }
2468         if (fnd) {
2469                 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) {
2470                         syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST);
2471                         return;
2472                 }
2473                 mlp = mlhead;
2474                 while (mlp) {
2475                         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
2476                         mlp = mlp->ml_next;
2477                 }
2478                 fclose(mlfile);
2479         }
2480 }
2481
2482 void
2483 add_mlist(char *hostp, char *dirp)
2484 {
2485         struct mountlist *mlp, **mlpp;
2486         FILE *mlfile;
2487
2488         mlpp = &mlhead;
2489         mlp = mlhead;
2490         while (mlp) {
2491                 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp))
2492                         return;
2493                 mlpp = &mlp->ml_next;
2494                 mlp = mlp->ml_next;
2495         }
2496         mlp = (struct mountlist *)malloc(sizeof (*mlp));
2497         if (mlp == NULL)
2498                 out_of_mem();
2499         strncpy(mlp->ml_host, hostp, RPCMNT_NAMELEN);
2500         mlp->ml_host[RPCMNT_NAMELEN] = '\0';
2501         strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN);
2502         mlp->ml_dirp[RPCMNT_PATHLEN] = '\0';
2503         mlp->ml_next = NULL;
2504         *mlpp = mlp;
2505         if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
2506                 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST);
2507                 return;
2508         }
2509         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
2510         fclose(mlfile);
2511 }
2512
2513 /*
2514  * Free up a group list.
2515  */
2516 void
2517 free_grp(struct grouplist *grp)
2518 {
2519         if (grp->gr_type == GT_HOST) {
2520                 if (grp->gr_ptr.gt_addrinfo != NULL)
2521                         freeaddrinfo(grp->gr_ptr.gt_addrinfo);
2522         } else if (grp->gr_type == GT_NET) {
2523                 if (grp->gr_ptr.gt_net.nt_name)
2524                         free(grp->gr_ptr.gt_net.nt_name);
2525         }
2526         free((caddr_t)grp);
2527 }
2528
2529 #ifdef DEBUG
2530 void
2531 SYSLOG(int pri, const char *fmt, ...)
2532 {
2533         va_list ap;
2534
2535         va_start(ap, fmt);
2536         vfprintf(stderr, fmt, ap);
2537         va_end(ap);
2538 }
2539 #endif /* DEBUG */
2540
2541 /*
2542  * Check options for consistency.
2543  */
2544 int
2545 check_options(struct dirlist *dp)
2546 {
2547
2548         if (dp == NULL)
2549             return (1);
2550         if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL)) {
2551                 syslog(LOG_ERR, "-mapall and -maproot mutually exclusive");
2552                 return (1);
2553         }
2554         if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) {
2555                 syslog(LOG_ERR, "-mask requires -network");
2556                 return (1);
2557         }
2558         if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) {
2559                 syslog(LOG_ERR, "-network requires mask specification");
2560                 return (1);
2561         }
2562         if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) {
2563                 syslog(LOG_ERR, "-mask and /masklen are mutually exclusive");
2564                 return (1);
2565         }
2566         if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
2567             syslog(LOG_ERR, "-alldirs has multiple directories");
2568             return (1);
2569         }
2570         return (0);
2571 }
2572
2573 /*
2574  * Check an absolute directory path for any symbolic links. Return true
2575  */
2576 int
2577 check_dirpath(char *dirp)
2578 {
2579         char *cp;
2580         int ret = 1;
2581         struct stat sb;
2582
2583         cp = dirp + 1;
2584         while (*cp && ret) {
2585                 if (*cp == '/') {
2586                         *cp = '\0';
2587                         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
2588                                 ret = 0;
2589                         *cp = '/';
2590                 }
2591                 cp++;
2592         }
2593         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
2594                 ret = 0;
2595         return (ret);
2596 }
2597
2598 /*
2599  * Make a netmask according to the specified prefix length. The ss_family
2600  * and other non-address fields must be initialised before calling this.
2601  */
2602 int
2603 makemask(struct sockaddr_storage *ssp, int bitlen)
2604 {
2605         u_char *p;
2606         int bits, i, len;
2607
2608         if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL)
2609                 return (-1);
2610         if (bitlen > len * CHAR_BIT)
2611                 return (-1);
2612         for (i = 0; i < len; i++) {
2613                 bits = (bitlen > CHAR_BIT) ? CHAR_BIT : bitlen;
2614                 *p++ = (u_char)~0 << (CHAR_BIT - bits);
2615                 bitlen -= bits;
2616         }
2617         return 0;
2618 }
2619
2620 /*
2621  * Check that the sockaddr is a valid netmask. Returns 0 if the mask
2622  * is acceptable (i.e. of the form 1...10....0).
2623  */
2624 int
2625 checkmask(struct sockaddr *sa)
2626 {
2627         u_char *mask;
2628         int i, len;
2629
2630         if ((mask = sa_rawaddr(sa, &len)) == NULL)
2631                 return (-1);
2632
2633         for (i = 0; i < len; i++)
2634                 if (mask[i] != 0xff)
2635                         break;
2636         if (i < len) {
2637                 if (~mask[i] & (u_char)(~mask[i] + 1))
2638                         return (-1);
2639                 i++;
2640         }
2641         for (; i < len; i++)
2642                 if (mask[i] != 0)
2643                         return (-1);
2644         return (0);
2645 }
2646
2647 /*
2648  * Compare two sockaddrs according to a specified mask. Return zero if
2649  * `sa1' matches `sa2' when filtered by the netmask in `samask'.
2650  * If samask is NULL, perform a full comparision.
2651  */
2652 int
2653 sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask)
2654 {
2655         unsigned char *p1, *p2, *mask;
2656         int len, i;
2657
2658         if (sa1->sa_family != sa2->sa_family ||
2659             (p1 = sa_rawaddr(sa1, &len)) == NULL ||
2660             (p2 = sa_rawaddr(sa2, NULL)) == NULL)
2661                 return (1);
2662
2663         switch (sa1->sa_family) {
2664         case AF_INET6:
2665                 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
2666                     ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
2667                         return (1);
2668                 break;
2669         }
2670
2671         /* Simple binary comparison if no mask specified. */
2672         if (samask == NULL)
2673                 return (memcmp(p1, p2, len));
2674
2675         /* Set up the mask, and do a mask-based comparison. */
2676         if (sa1->sa_family != samask->sa_family ||
2677             (mask = sa_rawaddr(samask, NULL)) == NULL)
2678                 return (1);
2679
2680         for (i = 0; i < len; i++)
2681                 if ((p1[i] & mask[i]) != (p2[i] & mask[i]))
2682                         return (1);
2683         return (0);
2684 }
2685
2686 /*
2687  * Return a pointer to the part of the sockaddr that contains the
2688  * raw address, and set *nbytes to its length in bytes. Returns
2689  * NULL if the address family is unknown.
2690  */
2691 void *
2692 sa_rawaddr(struct sockaddr *sa, int *nbytes) {
2693         void *p;
2694         int len;
2695
2696         switch (sa->sa_family) {
2697         case AF_INET:
2698                 len = sizeof(((struct sockaddr_in *)sa)->sin_addr);
2699                 p = &((struct sockaddr_in *)sa)->sin_addr;
2700                 break;
2701         case AF_INET6:
2702                 len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr);
2703                 p = &((struct sockaddr_in6 *)sa)->sin6_addr;
2704                 break;
2705         default:
2706                 p = NULL;
2707                 len = 0;
2708         }
2709
2710         if (nbytes != NULL)
2711                 *nbytes = len;
2712         return (p);
2713 }
2714
2715 void
2716 huphandler1(int sig __unused)
2717 {
2718         got_sighup1 = 1;
2719 }
2720
2721 void
2722 huphandler2(int sig __unused)
2723 {
2724         got_sighup2 = 1;
2725 }
2726
2727 void terminate(int sig __unused)
2728 {
2729         pidfile_remove(pfh);
2730         rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL);
2731         rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL);
2732         exit (0);
2733 }