usr.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  * 4. 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
  33 #ifndef lint
  34 static const char copyright[] =
  35 "@(#) Copyright (c) 1989, 1993\n\
  36         The Regents of the University of California.  All rights reserved.\n";
  37 #endif /*not lint*/
  38
  39 #if 0
  40 #ifndef lint
  41 static char sccsid[] = "@(#)mountd.c    8.15 (Berkeley) 5/1/95";
  42 #endif /*not lint*/
  43 #endif
  44
  45 #include <sys/cdefs.h>
  46 __FBSDID("$FreeBSD$");
  47
  48 #include <sys/param.h>
  49 #include <sys/mount.h>
  50 #include <sys/fcntl.h>
  51 #include <sys/stat.h>
  52 #include <sys/syslog.h>
  53 #include <sys/sysctl.h>
  54 #include <sys/linker.h>
  55 #include <sys/module.h>
  56
  57 #include <rpc/rpc.h>
  58 #include <rpc/rpc_com.h>
  59 #include <rpc/pmap_clnt.h>
  60 #include <rpc/pmap_prot.h>
  61 #include <rpcsvc/mount.h>
  62 #include <nfs/rpcv2.h>
  63 #include <nfs/nfsproto.h>
  64 #include <nfsserver/nfs.h>
  65
  66 #include <arpa/inet.h>
  67
  68 #include <ctype.h>
  69 #include <err.h>
  70 #include <errno.h>
  71 #include <grp.h>
  72 #include <libutil.h>
  73 #include <limits.h>
  74 #include <netdb.h>
  75 #include <pwd.h>
  76 #include <signal.h>
  77 #include <stdio.h>
  78 #include <stdlib.h>
  79 #include <string.h>
  80 #include <unistd.h>
  81 #include "pathnames.h"
  82 #include "mntopts.h"
  83
  84 #ifdef DEBUG
  85 #include <stdarg.h>
  86 #endif
  87
  88 /*
  89  * Structures for keeping the mount list and export list
  90  */
  91 struct mountlist {
  92         struct mountlist *ml_next;
  93         char    ml_host[RPCMNT_NAMELEN+1];
  94         char    ml_dirp[RPCMNT_PATHLEN+1];
  95 };
  96
  97 struct dirlist {
  98         struct dirlist  *dp_left;
  99         struct dirlist  *dp_right;
 100         int             dp_flag;
 101         struct hostlist *dp_hosts;      /* List of hosts this dir exported to */
 102         char            dp_dirp[1];     /* Actually malloc'd to size of dir */
 103 };
 104 /* dp_flag bits */
 105 #define DP_DEFSET       0x1
 106 #define DP_HOSTSET      0x2
 107
 108 struct exportlist {
 109         struct exportlist *ex_next;
 110         struct dirlist  *ex_dirl;
 111         struct dirlist  *ex_defdir;
 112         int             ex_flag;
 113         fsid_t          ex_fs;
 114         char            *ex_fsdir;
 115         char            *ex_indexfile;
 116 };
 117 /* ex_flag bits */
 118 #define EX_LINKED       0x1
 119
 120 struct netmsk {
 121         struct sockaddr_storage nt_net;
 122         struct sockaddr_storage nt_mask;
 123         char            *nt_name;
 124 };
 125
 126 union grouptypes {
 127         struct addrinfo *gt_addrinfo;
 128         struct netmsk   gt_net;
 129 };
 130
 131 struct grouplist {
 132         int gr_type;
 133         union grouptypes gr_ptr;
 134         struct grouplist *gr_next;
 135 };
 136 /* Group types */
 137 #define GT_NULL         0x0
 138 #define GT_HOST         0x1
 139 #define GT_NET          0x2
 140 #define GT_DEFAULT      0x3
 141 #define GT_IGNORE       0x5
 142
 143 struct hostlist {
 144         int              ht_flag;       /* Uses DP_xx bits */
 145         struct grouplist *ht_grp;
 146         struct hostlist  *ht_next;
 147 };
 148
 149 struct fhreturn {
 150         int     fhr_flag;
 151         int     fhr_vers;
 152         nfsfh_t fhr_fh;
 153 };
 154
 155 /* Global defs */
 156 char    *add_expdir(struct dirlist **, char *, int);
 157 void    add_dlist(struct dirlist **, struct dirlist *,
 158                                 struct grouplist *, int);
 159 void    add_mlist(char *, char *);
 160 int     check_dirpath(char *);
 161 int     check_options(struct dirlist *);
 162 int     checkmask(struct sockaddr *sa);
 163 int     chk_host(struct dirlist *, struct sockaddr *, int *, int *);
 164 void    create_service(struct netconfig *nconf);
 165 void    del_mlist(char *hostp, char *dirp);
 166 struct dirlist *dirp_search(struct dirlist *, char *);
 167 int     do_mount(struct exportlist *, struct grouplist *, int,
 168                 struct xucred *, char *, int, struct statfs *);
 169 int     do_opt(char **, char **, struct exportlist *, struct grouplist *,
 170                                 int *, int *, struct xucred *);
 171 struct  exportlist *ex_search(fsid_t *);
 172 struct  exportlist *get_exp(void);
 173 void    free_dir(struct dirlist *);
 174 void    free_exp(struct exportlist *);
 175 void    free_grp(struct grouplist *);
 176 void    free_host(struct hostlist *);
 177 void    get_exportlist(void);
 178 int     get_host(char *, struct grouplist *, struct grouplist *);
 179 struct hostlist *get_ht(void);
 180 int     get_line(void);
 181 void    get_mountlist(void);
 182 int     get_net(char *, struct netmsk *, int);
 183 void    getexp_err(struct exportlist *, struct grouplist *);
 184 struct grouplist *get_grp(void);
 185 void    hang_dirp(struct dirlist *, struct grouplist *,
 186                                 struct exportlist *, int);
 187 void    huphandler(int sig);
 188 int     makemask(struct sockaddr_storage *ssp, int bitlen);
 189 void    mntsrv(struct svc_req *, SVCXPRT *);
 190 void    nextfield(char **, char **);
 191 void    out_of_mem(void);
 192 void    parsecred(char *, struct xucred *);
 193 int     put_exlist(struct dirlist *, XDR *, struct dirlist *, int *, int);
 194 void    *sa_rawaddr(struct sockaddr *sa, int *nbytes);
 195 int     sacmp(struct sockaddr *sa1, struct sockaddr *sa2,
 196     struct sockaddr *samask);
 197 int     scan_tree(struct dirlist *, struct sockaddr *);
 198 static void usage(void);
 199 int     xdr_dir(XDR *, char *);
 200 int     xdr_explist(XDR *, caddr_t);
 201 int     xdr_explist_brief(XDR *, caddr_t);
 202 int     xdr_fhs(XDR *, caddr_t);
 203 int     xdr_mlist(XDR *, caddr_t);
 204 void    terminate(int);
 205
 206 struct exportlist *exphead;
 207 struct mountlist *mlhead;
 208 struct grouplist *grphead;
 209 char *exnames_default[2] = { _PATH_EXPORTS, NULL };
 210 char **exnames;
 211 char **hosts = NULL;
 212 struct xucred def_anon = {
 213         XUCRED_VERSION,
 214         (uid_t)-2,
 215         1,
 216         { (gid_t)-2 },
 217         NULL
 218 };
 219 int force_v2 = 0;
 220 int resvport_only = 1;
 221 int nhosts = 0;
 222 int dir_only = 1;
 223 int dolog = 0;
 224 int got_sighup = 0;
 225 int xcreated = 0;
 226
 227 char *svcport_str = NULL;
 228
 229 int opt_flags;
 230 static int have_v6 = 1;
 231
 232 struct pidfh *pfh = NULL;
 233 /* Bits for opt_flags above */
 234 #define OP_MAPROOT      0x01
 235 #define OP_MAPALL       0x02
 236 /* 0x4 free */
 237 #define OP_MASK         0x08
 238 #define OP_NET          0x10
 239 #define OP_ALLDIRS      0x40
 240 #define OP_HAVEMASK     0x80    /* A mask was specified or inferred. */
 241 #define OP_QUIET        0x100
 242 #define OP_MASKLEN      0x200
 243
 244 #ifdef DEBUG
 245 int debug = 1;
 246 void    SYSLOG(int, const char *, ...) __printflike(2, 3);
 247 #define syslog SYSLOG
 248 #else
 249 int debug = 0;
 250 #endif
 251
 252 /*
 253  * Mountd server for NFS mount protocol as described in:
 254  * NFS: Network File System Protocol Specification, RFC1094, Appendix A
 255  * The optional arguments are the exports file name
 256  * default: _PATH_EXPORTS
 257  * and "-n" to allow nonroot mount.
 258  */
 259 int
 260 main(argc, argv)
 261         int argc;
 262         char **argv;
 263 {
 264         fd_set readfds;
 265         struct netconfig *nconf;
 266         char *endptr, **hosts_bak;
 267         void *nc_handle;
 268         pid_t otherpid;
 269         in_port_t svcport;
 270         int c, k, s;
 271         int maxrec = RPC_MAXDATASIZE;
 272
 273         /* Check that another mountd isn't already running. */
 274         pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &otherpid);
 275         if (pfh == NULL) {
 276                 if (errno == EEXIST)
 277                         errx(1, "mountd already running, pid: %d.", otherpid);
 278                 warn("cannot open or create pidfile");
 279         }
 280
 281         s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
 282         if (s < 0)
 283                 have_v6 = 0;
 284         else
 285                 close(s);
 286         if (modfind("nfsserver") < 0) {
 287                 /* Not present in kernel, try loading it */
 288                 if (kldload("nfsserver") < 0 || modfind("nfsserver") < 0)
 289                         errx(1, "NFS server is not available or loadable");
 290         }
 291
 292         while ((c = getopt(argc, argv, "2dh:lnp:r")) != -1)
 293                 switch (c) {
 294                 case '2':
 295                         force_v2 = 1;
 296                         break;
 297                 case 'n':
 298                         resvport_only = 0;
 299                         break;
 300                 case 'r':
 301                         dir_only = 0;
 302                         break;
 303                 case 'd':
 304                         debug = debug ? 0 : 1;
 305                         break;
 306                 case 'l':
 307                         dolog = 1;
 308                         break;
 309                 case 'p':
 310                         endptr = NULL;
 311                         svcport = (in_port_t)strtoul(optarg, &endptr, 10);
 312                         if (endptr == NULL || *endptr != '\0' ||
 313                             svcport == 0 || svcport >= IPPORT_MAX)
 314                                 usage();
 315                         svcport_str = strdup(optarg);
 316                         break;
 317                 case 'h':
 318                         ++nhosts;
 319                         hosts_bak = hosts;
 320                         hosts_bak = realloc(hosts, nhosts * sizeof(char *));
 321                         if (hosts_bak == NULL) {
 322                                 if (hosts != NULL) {
 323                                         for (k = 0; k < nhosts; k++)
 324                                                 free(hosts[k]);
 325                                         free(hosts);
 326                                         out_of_mem();
 327                                 }
 328                         }
 329                         hosts = hosts_bak;
 330                         hosts[nhosts - 1] = strdup(optarg);
 331                         if (hosts[nhosts - 1] == NULL) {
 332                                 for (k = 0; k < (nhosts - 1); k++)
 333                                         free(hosts[k]);
 334                                 free(hosts);
 335                                 out_of_mem();
 336                         }
 337                         break;
 338                 default:
 339                         usage();
 340                 };
 341         argc -= optind;
 342         argv += optind;
 343         grphead = (struct grouplist *)NULL;
 344         exphead = (struct exportlist *)NULL;
 345         mlhead = (struct mountlist *)NULL;
 346         if (argc > 0)
 347                 exnames = argv;
 348         else
 349                 exnames = exnames_default;
 350         openlog("mountd", LOG_PID, LOG_DAEMON);
 351         if (debug)
 352                 warnx("getting export list");
 353         get_exportlist();
 354         if (debug)
 355                 warnx("getting mount list");
 356         get_mountlist();
 357         if (debug)
 358                 warnx("here we go");
 359         if (debug == 0) {
 360                 daemon(0, 0);
 361                 signal(SIGINT, SIG_IGN);
 362                 signal(SIGQUIT, SIG_IGN);
 363         }
 364         signal(SIGHUP, huphandler);
 365         signal(SIGTERM, terminate);
 366         signal(SIGPIPE, SIG_IGN);
 367
 368         pidfile_write(pfh);
 369
 370         rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL);
 371         rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL);
 372         rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);
 373
 374         if (!resvport_only) {
 375                 if (sysctlbyname("vfs.nfsrv.nfs_privport", NULL, NULL,
 376                     &resvport_only, sizeof(resvport_only)) != 0 &&
 377                     errno != ENOENT) {
 378                         syslog(LOG_ERR, "sysctl: %m");
 379                         exit(1);
 380                 }
 381         }
 382
 383         /*
 384          * If no hosts were specified, add a wildcard entry to bind to
 385          * INADDR_ANY. Otherwise make sure 127.0.0.1 and ::1 are added to the
 386          * list.
 387          */
 388         if (nhosts == 0) {
 389                 hosts = malloc(sizeof(char**));
 390                 if (hosts == NULL)
 391                         out_of_mem();
 392                 hosts[0] = "*";
 393                 nhosts = 1;
 394         } else {
 395                 hosts_bak = hosts;
 396                 if (have_v6) {
 397                         hosts_bak = realloc(hosts, (nhosts + 2) *
 398                             sizeof(char *));
 399                         if (hosts_bak == NULL) {
 400                                 for (k = 0; k < nhosts; k++)
 401                                         free(hosts[k]);
 402                                 free(hosts);
 403                                 out_of_mem();
 404                         } else
 405                                 hosts = hosts_bak;
 406                         nhosts += 2;
 407                         hosts[nhosts - 2] = "::1";
 408                 } else {
 409                         hosts_bak = realloc(hosts, (nhosts + 1) * sizeof(char *));
 410                         if (hosts_bak == NULL) {
 411                                 for (k = 0; k < nhosts; k++)
 412                                         free(hosts[k]);
 413                                 free(hosts);
 414                                 out_of_mem();
 415                         } else {
 416                                 nhosts += 1;
 417                                 hosts = hosts_bak;
 418                         }
 419                 }
 420
 421                 hosts[nhosts - 1] = "127.0.0.1";
 422         }
 423
 424         nc_handle = setnetconfig();
 425         while ((nconf = getnetconfig(nc_handle))) {
 426                 if (nconf->nc_flag & NC_VISIBLE) {
 427                         if (have_v6 == 0 && strcmp(nconf->nc_protofmly,
 428                             "inet6") == 0) {
 429                                 /* DO NOTHING */
 430                         } else
 431                                 create_service(nconf);
 432                 }
 433         }
 434         endnetconfig(nc_handle);
 435
 436         if (xcreated == 0) {
 437                 syslog(LOG_ERR, "could not create any services");
 438                 exit(1);
 439         }
 440
 441         /* Expand svc_run() here so that we can call get_exportlist(). */
 442         for (;;) {
 443                 if (got_sighup) {
 444                         get_exportlist();
 445                         got_sighup = 0;
 446                 }
 447                 readfds = svc_fdset;
 448                 switch (select(svc_maxfd + 1, &readfds, NULL, NULL, NULL)) {
 449                 case -1:
 450                         if (errno == EINTR)
 451                                 continue;
 452                         syslog(LOG_ERR, "mountd died: select: %m");
 453                         exit(1);
 454                 case 0:
 455                         continue;
 456                 default:
 457                         svc_getreqset(&readfds);
 458                 }
 459         }
 460 }
 461
 462 /*
 463  * This routine creates and binds sockets on the appropriate
 464  * addresses. It gets called one time for each transport and
 465  * registrates the service with rpcbind on that trasport.
 466  */
 467 void
 468 create_service(struct netconfig *nconf)
 469 {
 470         struct addrinfo hints, *res = NULL;
 471         struct sockaddr_in *sin;
 472         struct sockaddr_in6 *sin6;
 473         struct __rpc_sockinfo si;
 474         struct netbuf servaddr;
 475         SVCXPRT *transp = NULL;
 476         int aicode;
 477         int fd;
 478         int nhostsbak;
 479         int one = 1;
 480         int r;
 481         int registered = 0;
 482         u_int32_t host_addr[4];  /* IPv4 or IPv6 */
 483
 484         if ((nconf->nc_semantics != NC_TPI_CLTS) &&
 485             (nconf->nc_semantics != NC_TPI_COTS) &&
 486             (nconf->nc_semantics != NC_TPI_COTS_ORD))
 487                 return; /* not my type */
 488
 489         /*
 490          * XXX - using RPC library internal functions.
 491          */
 492         if (!__rpc_nconf2sockinfo(nconf, &si)) {
 493                 syslog(LOG_ERR, "cannot get information for %s",
 494                     nconf->nc_netid);
 495                 return;
 496         }
 497
 498         /* Get mountd's address on this transport */
 499         memset(&hints, 0, sizeof hints);
 500         hints.ai_flags = AI_PASSIVE;
 501         hints.ai_family = si.si_af;
 502         hints.ai_socktype = si.si_socktype;
 503         hints.ai_protocol = si.si_proto;
 504
 505         /*
 506          * Bind to specific IPs if asked to
 507          */
 508         nhostsbak = nhosts;
 509         while (nhostsbak > 0) {
 510                 --nhostsbak;
 511                 /*
 512                  * XXX - using RPC library internal functions.
 513                  */
 514                 if ((fd = __rpc_nconf2fd(nconf)) < 0) {
 515                         int non_fatal = 0;
 516                         if (errno == EPROTONOSUPPORT &&
 517                             nconf->nc_semantics != NC_TPI_CLTS)
 518                                 non_fatal = 1;
 519
 520                         syslog(non_fatal ? LOG_DEBUG : LOG_ERR,
 521                             "cannot create socket for %s", nconf->nc_netid);
 522                         return;
 523                 }
 524
 525                 switch (hints.ai_family) {
 526                 case AF_INET:
 527                         if (inet_pton(AF_INET, hosts[nhostsbak],
 528                             host_addr) == 1) {
 529                                 hints.ai_flags &= AI_NUMERICHOST;
 530                         } else {
 531                                 /*
 532                                  * Skip if we have an AF_INET6 address.
 533                                  */
 534                                 if (inet_pton(AF_INET6, hosts[nhostsbak],
 535                                     host_addr) == 1) {
 536                                         close(fd);
 537                                         continue;
 538                                 }
 539                         }
 540                         break;
 541                 case AF_INET6:
 542                         if (inet_pton(AF_INET6, hosts[nhostsbak],
 543                             host_addr) == 1) {
 544                                 hints.ai_flags &= AI_NUMERICHOST;
 545                         } else {
 546                                 /*
 547                                  * Skip if we have an AF_INET address.
 548                                  */
 549                                 if (inet_pton(AF_INET, hosts[nhostsbak],
 550                                     host_addr) == 1) {
 551                                         close(fd);
 552                                         continue;
 553                                 }
 554                         }
 555
 556                         /*
 557                          * We're doing host-based access checks here, so don't
 558                          * allow v4-in-v6 to confuse things. The kernel will
 559                          * disable it by default on NFS sockets too.
 560                          */
 561                         if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one,
 562                             sizeof one) < 0) {
 563                                 syslog(LOG_ERR,
 564                                     "can't disable v4-in-v6 on IPv6 socket");
 565                                 exit(1);
 566                         }
 567                         break;
 568                 default:
 569                         break;
 570                 }
 571
 572                 /*
 573                  * If no hosts were specified, just bind to INADDR_ANY
 574                  */
 575                 if (strcmp("*", hosts[nhostsbak]) == 0) {
 576                         if (svcport_str == NULL) {
 577                                 res = malloc(sizeof(struct addrinfo));
 578                                 if (res == NULL)
 579                                         out_of_mem();
 580                                 res->ai_flags = hints.ai_flags;
 581                                 res->ai_family = hints.ai_family;
 582                                 res->ai_protocol = hints.ai_protocol;
 583                                 switch (res->ai_family) {
 584                                 case AF_INET:
 585                                         sin = malloc(sizeof(struct sockaddr_in));
 586                                         if (sin == NULL)
 587                                                 out_of_mem();
 588                                         sin->sin_family = AF_INET;
 589                                         sin->sin_port = htons(0);
 590                                         sin->sin_addr.s_addr = htonl(INADDR_ANY);
 591                                         res->ai_addr = (struct sockaddr*) sin;
 592                                         res->ai_addrlen = (socklen_t)
 593                                             sizeof(res->ai_addr);
 594                                         break;
 595                                 case AF_INET6:
 596                                         sin6 = malloc(sizeof(struct sockaddr_in6));
 597                                         if (sin6 == NULL)
 598                                                 out_of_mem();
 599                                         sin6->sin6_family = AF_INET6;
 600                                         sin6->sin6_port = htons(0);
 601                                         sin6->sin6_addr = in6addr_any;
 602                                         res->ai_addr = (struct sockaddr*) sin6;
 603                                         res->ai_addrlen = (socklen_t)
 604                                             sizeof(res->ai_addr);
 605                                                 break;
 606                                 default:
 607                                         break;
 608                                 }
 609                         } else {
 610                                 if ((aicode = getaddrinfo(NULL, svcport_str,
 611                                     &hints, &res)) != 0) {
 612                                         syslog(LOG_ERR,
 613                                             "cannot get local address for %s: %s",
 614                                             nconf->nc_netid,
 615                                             gai_strerror(aicode));
 616                                         continue;
 617                                 }
 618                         }
 619                 } else {
 620                         if ((aicode = getaddrinfo(hosts[nhostsbak], svcport_str,
 621                             &hints, &res)) != 0) {
 622                                 syslog(LOG_ERR,
 623                                     "cannot get local address for %s: %s",
 624                                     nconf->nc_netid, gai_strerror(aicode));
 625                                 continue;
 626                         }
 627                 }
 628
 629                 r = bindresvport_sa(fd, res->ai_addr);
 630                 if (r != 0) {
 631                         syslog(LOG_ERR, "bindresvport_sa: %m");
 632                         exit(1);
 633                 }
 634
 635                 if (nconf->nc_semantics != NC_TPI_CLTS)
 636                         listen(fd, SOMAXCONN);
 637
 638                 if (nconf->nc_semantics == NC_TPI_CLTS )
 639                         transp = svc_dg_create(fd, 0, 0);
 640                 else
 641                         transp = svc_vc_create(fd, RPC_MAXDATASIZE,
 642                             RPC_MAXDATASIZE);
 643
 644                 if (transp != (SVCXPRT *) NULL) {
 645                         if (!svc_reg(transp, RPCPROG_MNT, RPCMNT_VER1, mntsrv,
 646                             NULL))
 647                                 syslog(LOG_ERR,
 648                                     "can't register %s RPCMNT_VER1 service",
 649                                     nconf->nc_netid);
 650                         if (!force_v2) {
 651                                 if (!svc_reg(transp, RPCPROG_MNT, RPCMNT_VER3,
 652                                     mntsrv, NULL))
 653                                         syslog(LOG_ERR,
 654                                             "can't register %s RPCMNT_VER3 service",
 655                                             nconf->nc_netid);
 656                         }
 657                 } else
 658                         syslog(LOG_WARNING, "can't create %s services",
 659                             nconf->nc_netid);
 660
 661                 if (registered == 0) {
 662                         registered = 1;
 663                         memset(&hints, 0, sizeof hints);
 664                         hints.ai_flags = AI_PASSIVE;
 665                         hints.ai_family = si.si_af;
 666                         hints.ai_socktype = si.si_socktype;
 667                         hints.ai_protocol = si.si_proto;
 668
 669                         if (svcport_str == NULL) {
 670                                 svcport_str = malloc(NI_MAXSERV * sizeof(char));
 671                                 if (svcport_str == NULL)
 672                                         out_of_mem();
 673
 674                                 if (getnameinfo(res->ai_addr,
 675                                     res->ai_addr->sa_len, NULL, NI_MAXHOST,
 676                                     svcport_str, NI_MAXSERV * sizeof(char),
 677                                     NI_NUMERICHOST | NI_NUMERICSERV))
 678                                         errx(1, "Cannot get port number");
 679                         }
 680
 681                         if((aicode = getaddrinfo(NULL, svcport_str, &hints,
 682                             &res)) != 0) {
 683                                 syslog(LOG_ERR, "cannot get local address: %s",
 684                                     gai_strerror(aicode));
 685                                 exit(1);
 686                         }
 687
 688                         servaddr.buf = malloc(res->ai_addrlen);
 689                         memcpy(servaddr.buf, res->ai_addr, res->ai_addrlen);
 690                         servaddr.len = res->ai_addrlen;
 691
 692                         rpcb_set(RPCPROG_MNT, RPCMNT_VER1, nconf, &servaddr);
 693                         rpcb_set(RPCPROG_MNT, RPCMNT_VER3, nconf, &servaddr);
 694
 695                         xcreated++;
 696                         freeaddrinfo(res);
 697                 }
 698         } /* end while */
 699 }
 700
 701 static void
 702 usage()
 703 {
 704         fprintf(stderr,
 705                 "usage: mountd [-2] [-d] [-l] [-n] [-p <port>] [-r] "
 706                 "[-h <bindip>] [export_file ...]\n");
 707         exit(1);
 708 }
 709
 710 /*
 711  * The mount rpc service
 712  */
 713 void
 714 mntsrv(rqstp, transp)
 715         struct svc_req *rqstp;
 716         SVCXPRT *transp;
 717 {
 718         struct exportlist *ep;
 719         struct dirlist *dp;
 720         struct fhreturn fhr;
 721         struct stat stb;
 722         struct statfs fsb;
 723         char host[NI_MAXHOST], numerichost[NI_MAXHOST];
 724         int lookup_failed = 1;
 725         struct sockaddr *saddr;
 726         u_short sport;
 727         char rpcpath[RPCMNT_PATHLEN + 1], dirpath[MAXPATHLEN];
 728         int bad = 0, defset, hostset;
 729         sigset_t sighup_mask;
 730
 731         sigemptyset(&sighup_mask);
 732         sigaddset(&sighup_mask, SIGHUP);
 733         saddr = svc_getrpccaller(transp)->buf;
 734         switch (saddr->sa_family) {
 735         case AF_INET6:
 736                 sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port);
 737                 break;
 738         case AF_INET:
 739                 sport = ntohs(((struct sockaddr_in *)saddr)->sin_port);
 740                 break;
 741         default:
 742                 syslog(LOG_ERR, "request from unknown address family");
 743                 return;
 744         }
 745         lookup_failed = getnameinfo(saddr, saddr->sa_len, host, sizeof host,
 746             NULL, 0, 0);
 747         getnameinfo(saddr, saddr->sa_len, numerichost,
 748             sizeof numerichost, NULL, 0, NI_NUMERICHOST);
 749         switch (rqstp->rq_proc) {
 750         case NULLPROC:
 751                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL))
 752                         syslog(LOG_ERR, "can't send reply");
 753                 return;
 754         case RPCMNT_MOUNT:
 755                 if (sport >= IPPORT_RESERVED && resvport_only) {
 756                         syslog(LOG_NOTICE,
 757                             "mount request from %s from unprivileged port",
 758                             numerichost);
 759                         svcerr_weakauth(transp);
 760                         return;
 761                 }
 762                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
 763                         syslog(LOG_NOTICE, "undecodable mount request from %s",
 764                             numerichost);
 765                         svcerr_decode(transp);
 766                         return;
 767                 }
 768
 769                 /*
 770                  * Get the real pathname and make sure it is a directory
 771                  * or a regular file if the -r option was specified
 772                  * and it exists.
 773                  */
 774                 if (realpath(rpcpath, dirpath) == NULL ||
 775                     stat(dirpath, &stb) < 0 ||
 776                     (!S_ISDIR(stb.st_mode) &&
 777                     (dir_only || !S_ISREG(stb.st_mode))) ||
 778                     statfs(dirpath, &fsb) < 0) {
 779                         chdir("/");     /* Just in case realpath doesn't */
 780                         syslog(LOG_NOTICE,
 781                             "mount request from %s for non existent path %s",
 782                             numerichost, dirpath);
 783                         if (debug)
 784                                 warnx("stat failed on %s", dirpath);
 785                         bad = ENOENT;   /* We will send error reply later */
 786                 }
 787
 788                 /* Check in the exports list */
 789                 sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
 790                 ep = ex_search(&fsb.f_fsid);
 791                 hostset = defset = 0;
 792                 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset) ||
 793                     ((dp = dirp_search(ep->ex_dirl, dirpath)) &&
 794                       chk_host(dp, saddr, &defset, &hostset)) ||
 795                     (defset && scan_tree(ep->ex_defdir, saddr) == 0 &&
 796                      scan_tree(ep->ex_dirl, saddr) == 0))) {
 797                         if (bad) {
 798                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
 799                                     (caddr_t)&bad))
 800                                         syslog(LOG_ERR, "can't send reply");
 801                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 802                                 return;
 803                         }
 804                         if (hostset & DP_HOSTSET)
 805                                 fhr.fhr_flag = hostset;
 806                         else
 807                                 fhr.fhr_flag = defset;
 808                         fhr.fhr_vers = rqstp->rq_vers;
 809                         /* Get the file handle */
 810                         memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t));
 811                         if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) {
 812                                 bad = errno;
 813                                 syslog(LOG_ERR, "can't get fh for %s", dirpath);
 814                                 if (!svc_sendreply(transp, (xdrproc_t)xdr_long,
 815                                     (caddr_t)&bad))
 816                                         syslog(LOG_ERR, "can't send reply");
 817                                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 818                                 return;
 819                         }
 820                         if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs,
 821                             (caddr_t)&fhr))
 822                                 syslog(LOG_ERR, "can't send reply");
 823                         if (!lookup_failed)
 824                                 add_mlist(host, dirpath);
 825                         else
 826                                 add_mlist(numerichost, dirpath);
 827                         if (debug)
 828                                 warnx("mount successful");
 829                         if (dolog)
 830                                 syslog(LOG_NOTICE,
 831                                     "mount request succeeded from %s for %s",
 832                                     numerichost, dirpath);
 833                 } else {
 834                         bad = EACCES;
 835                         syslog(LOG_NOTICE,
 836                             "mount request denied from %s for %s",
 837                             numerichost, dirpath);
 838                 }
 839
 840                 if (bad && !svc_sendreply(transp, (xdrproc_t)xdr_long,
 841                     (caddr_t)&bad))
 842                         syslog(LOG_ERR, "can't send reply");
 843                 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
 844                 return;
 845         case RPCMNT_DUMP:
 846                 if (!svc_sendreply(transp, (xdrproc_t)xdr_mlist, (caddr_t)NULL))
 847                         syslog(LOG_ERR, "can't send reply");
 848                 else if (dolog)
 849                         syslog(LOG_NOTICE,
 850                             "dump request succeeded from %s",
 851                             numerichost);
 852                 return;
 853         case RPCMNT_UMOUNT:
 854                 if (sport >= IPPORT_RESERVED && resvport_only) {
 855                         syslog(LOG_NOTICE,
 856                             "umount request from %s from unprivileged port",
 857                             numerichost);
 858                         svcerr_weakauth(transp);
 859                         return;
 860                 }
 861                 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) {
 862                         syslog(LOG_NOTICE, "undecodable umount request from %s",
 863                             numerichost);
 864                         svcerr_decode(transp);
 865                         return;
 866                 }
 867                 if (realpath(rpcpath, dirpath) == NULL) {
 868                         syslog(LOG_NOTICE, "umount request from %s "
 869                             "for non existent path %s",
 870                             numerichost, dirpath);
 871                 }
 872                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL))
 873                         syslog(LOG_ERR, "can't send reply");
 874                 if (!lookup_failed)
 875                         del_mlist(host, dirpath);
 876                 del_mlist(numerichost, dirpath);
 877                 if (dolog)
 878                         syslog(LOG_NOTICE,
 879                             "umount request succeeded from %s for %s",
 880                             numerichost, dirpath);
 881                 return;
 882         case RPCMNT_UMNTALL:
 883                 if (sport >= IPPORT_RESERVED && resvport_only) {
 884                         syslog(LOG_NOTICE,
 885                             "umountall request from %s from unprivileged port",
 886                             numerichost);
 887                         svcerr_weakauth(transp);
 888                         return;
 889                 }
 890                 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL))
 891                         syslog(LOG_ERR, "can't send reply");
 892                 if (!lookup_failed)
 893                         del_mlist(host, NULL);
 894                 del_mlist(numerichost, NULL);
 895                 if (dolog)
 896                         syslog(LOG_NOTICE,
 897                             "umountall request succeeded from %s",
 898                             numerichost);
 899                 return;
 900         case RPCMNT_EXPORT:
 901                 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, (caddr_t)NULL))
 902                         if (!svc_sendreply(transp, (xdrproc_t)xdr_explist_brief,
 903                             (caddr_t)NULL))
 904                                 syslog(LOG_ERR, "can't send reply");
 905                 if (dolog)
 906                         syslog(LOG_NOTICE,
 907                             "export request succeeded from %s",
 908                             numerichost);
 909                 return;
 910         default:
 911                 svcerr_noproc(transp);
 912                 return;
 913         }
 914 }
 915
 916 /*
 917  * Xdr conversion for a dirpath string
 918  */
 919 int
 920 xdr_dir(xdrsp, dirp)
 921         XDR *xdrsp;
 922         char *dirp;
 923 {
 924         return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
 925 }
 926
 927 /*
 928  * Xdr routine to generate file handle reply
 929  */
 930 int
 931 xdr_fhs(xdrsp, cp)
 932         XDR *xdrsp;
 933         caddr_t cp;
 934 {
 935         struct fhreturn *fhrp = (struct fhreturn *)cp;
 936         u_long ok = 0, len, auth;
 937
 938         if (!xdr_long(xdrsp, &ok))
 939                 return (0);
 940         switch (fhrp->fhr_vers) {
 941         case 1:
 942                 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH));
 943         case 3:
 944                 len = NFSX_V3FH;
 945                 if (!xdr_long(xdrsp, &len))
 946                         return (0);
 947                 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len))
 948                         return (0);
 949                 auth = RPCAUTH_UNIX;
 950                 len = 1;
 951                 if (!xdr_long(xdrsp, &len))
 952                         return (0);
 953                 return (xdr_long(xdrsp, &auth));
 954         };
 955         return (0);
 956 }
 957
 958 int
 959 xdr_mlist(xdrsp, cp)
 960         XDR *xdrsp;
 961         caddr_t cp;
 962 {
 963         struct mountlist *mlp;
 964         int true = 1;
 965         int false = 0;
 966         char *strp;
 967
 968         mlp = mlhead;
 969         while (mlp) {
 970                 if (!xdr_bool(xdrsp, &true))
 971                         return (0);
 972                 strp = &mlp->ml_host[0];
 973                 if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN))
 974                         return (0);
 975                 strp = &mlp->ml_dirp[0];
 976                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
 977                         return (0);
 978                 mlp = mlp->ml_next;
 979         }
 980         if (!xdr_bool(xdrsp, &false))
 981                 return (0);
 982         return (1);
 983 }
 984
 985 /*
 986  * Xdr conversion for export list
 987  */
 988 int
 989 xdr_explist_common(xdrsp, cp, brief)
 990         XDR *xdrsp;
 991         caddr_t cp;
 992         int brief;
 993 {
 994         struct exportlist *ep;
 995         int false = 0;
 996         int putdef;
 997         sigset_t sighup_mask;
 998
 999         sigemptyset(&sighup_mask);
1000         sigaddset(&sighup_mask, SIGHUP);
1001         sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
1002         ep = exphead;
1003         while (ep) {
1004                 putdef = 0;
1005                 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir,
1006                                &putdef, brief))
1007                         goto errout;
1008                 if (ep->ex_defdir && putdef == 0 &&
1009                         put_exlist(ep->ex_defdir, xdrsp, (struct dirlist *)NULL,
1010                         &putdef, brief))
1011                         goto errout;
1012                 ep = ep->ex_next;
1013         }
1014         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1015         if (!xdr_bool(xdrsp, &false))
1016                 return (0);
1017         return (1);
1018 errout:
1019         sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
1020         return (0);
1021 }
1022
1023 /*
1024  * Called from xdr_explist() to traverse the tree and export the
1025  * directory paths.
1026  */
1027 int
1028 put_exlist(dp, xdrsp, adp, putdefp, brief)
1029         struct dirlist *dp;
1030         XDR *xdrsp;
1031         struct dirlist *adp;
1032         int *putdefp;
1033         int brief;
1034 {
1035         struct grouplist *grp;
1036         struct hostlist *hp;
1037         int true = 1;
1038         int false = 0;
1039         int gotalldir = 0;
1040         char *strp;
1041
1042         if (dp) {
1043                 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp, brief))
1044                         return (1);
1045                 if (!xdr_bool(xdrsp, &true))
1046                         return (1);
1047                 strp = dp->dp_dirp;
1048                 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
1049                         return (1);
1050                 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) {
1051                         gotalldir = 1;
1052                         *putdefp = 1;
1053                 }
1054                 if (brief) {
1055                         if (!xdr_bool(xdrsp, &true))
1056                                 return (1);
1057                         strp = "(...)";
1058                         if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN))
1059                                 return (1);
1060                 } else if ((dp->dp_flag & DP_DEFSET) == 0 &&
1061                     (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) {
1062                         hp = dp->dp_hosts;
1063                         while (hp) {
1064                                 grp = hp->ht_grp;
1065                                 if (grp->gr_type == GT_HOST) {
1066                                         if (!xdr_bool(xdrsp, &true))
1067                                                 return (1);
1068                                         strp = grp->gr_ptr.gt_addrinfo->ai_canonname;
1069                                         if (!xdr_string(xdrsp, &strp,
1070                                             RPCMNT_NAMELEN))
1071                                                 return (1);
1072                                 } else if (grp->gr_type == GT_NET) {
1073                                         if (!xdr_bool(xdrsp, &true))
1074                                                 return (1);
1075                                         strp = grp->gr_ptr.gt_net.nt_name;
1076                                         if (!xdr_string(xdrsp, &strp,
1077                                             RPCMNT_NAMELEN))
1078                                                 return (1);
1079                                 }
1080                                 hp = hp->ht_next;
1081                                 if (gotalldir && hp == (struct hostlist *)NULL) {
1082                                         hp = adp->dp_hosts;
1083                                         gotalldir = 0;
1084                                 }
1085                         }
1086                 }
1087                 if (!xdr_bool(xdrsp, &false))
1088                         return (1);
1089                 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp, brief))
1090                         return (1);
1091         }
1092         return (0);
1093 }
1094
1095 int
1096 xdr_explist(xdrsp, cp)
1097         XDR *xdrsp;
1098         caddr_t cp;
1099 {
1100
1101         return xdr_explist_common(xdrsp, cp, 0);
1102 }
1103
1104 int
1105 xdr_explist_brief(xdrsp, cp)
1106         XDR *xdrsp;
1107         caddr_t cp;
1108 {
1109
1110         return xdr_explist_common(xdrsp, cp, 1);
1111 }
1112
1113 char *line;
1114 int linesize;
1115 FILE *exp_file;
1116
1117 /*
1118  * Get the export list from one, currently open file
1119  */
1120 static void
1121 get_exportlist_one()
1122 {
1123         struct exportlist *ep, *ep2;
1124         struct grouplist *grp, *tgrp;
1125         struct exportlist **epp;
1126         struct dirlist *dirhead;
1127         struct statfs fsb;
1128         struct xucred anon;
1129         char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc;
1130         int len, has_host, exflags, got_nondir, dirplen, netgrp;
1131
1132         dirhead = (struct dirlist *)NULL;
1133         while (get_line()) {
1134                 if (debug)
1135                         warnx("got line %s", line);
1136                 cp = line;
1137                 nextfield(&cp, &endcp);
1138                 if (*cp == '#')
1139                         goto nextline;
1140
1141                 /*
1142                  * Set defaults.
1143                  */
1144                 has_host = FALSE;
1145                 anon = def_anon;
1146                 exflags = MNT_EXPORTED;
1147                 got_nondir = 0;
1148                 opt_flags = 0;
1149                 ep = (struct exportlist *)NULL;
1150
1151                 /*
1152                  * Create new exports list entry
1153                  */
1154                 len = endcp-cp;
1155                 tgrp = grp = get_grp();
1156                 while (len > 0) {
1157                         if (len > RPCMNT_NAMELEN) {
1158                             getexp_err(ep, tgrp);
1159                             goto nextline;
1160                         }
1161                         if (*cp == '-') {
1162                             if (ep == (struct exportlist *)NULL) {
1163                                 getexp_err(ep, tgrp);
1164                                 goto nextline;
1165                             }
1166                             if (debug)
1167                                 warnx("doing opt %s", cp);
1168                             got_nondir = 1;
1169                             if (do_opt(&cp, &endcp, ep, grp, &has_host,
1170                                 &exflags, &anon)) {
1171                                 getexp_err(ep, tgrp);
1172                                 goto nextline;
1173                             }
1174                         } else if (*cp == '/') {
1175                             savedc = *endcp;
1176                             *endcp = '\0';
1177                             if (check_dirpath(cp) &&
1178                                 statfs(cp, &fsb) >= 0) {
1179                                 if (got_nondir) {
1180                                     syslog(LOG_ERR, "dirs must be first");
1181                                     getexp_err(ep, tgrp);
1182                                     goto nextline;
1183                                 }
1184                                 if (ep) {
1185                                     if (ep->ex_fs.val[0] != fsb.f_fsid.val[0] ||
1186                                         ep->ex_fs.val[1] != fsb.f_fsid.val[1]) {
1187                                         getexp_err(ep, tgrp);
1188                                         goto nextline;
1189                                     }
1190                                 } else {
1191                                     /*
1192                                      * See if this directory is already
1193                                      * in the list.
1194                                      */
1195                                     ep = ex_search(&fsb.f_fsid);
1196                                     if (ep == (struct exportlist *)NULL) {
1197                                         ep = get_exp();
1198                                         ep->ex_fs = fsb.f_fsid;
1199                                         ep->ex_fsdir = (char *)
1200                                             malloc(strlen(fsb.f_mntonname) + 1);
1201                                         if (ep->ex_fsdir)
1202                                             strcpy(ep->ex_fsdir,
1203                                                 fsb.f_mntonname);
1204                                         else
1205                                             out_of_mem();
1206                                         if (debug)
1207                                                 warnx("making new ep fs=0x%x,0x%x",
1208                                                     fsb.f_fsid.val[0],
1209                                                     fsb.f_fsid.val[1]);
1210                                     } else if (debug)
1211                                         warnx("found ep fs=0x%x,0x%x",
1212                                             fsb.f_fsid.val[0],
1213                                             fsb.f_fsid.val[1]);
1214                                 }
1215
1216                                 /*
1217                                  * Add dirpath to export mount point.
1218                                  */
1219                                 dirp = add_expdir(&dirhead, cp, len);
1220                                 dirplen = len;
1221                             } else {
1222                                 getexp_err(ep, tgrp);
1223                                 goto nextline;
1224                             }
1225                             *endcp = savedc;
1226                         } else {
1227                             savedc = *endcp;
1228                             *endcp = '\0';
1229                             got_nondir = 1;
1230                             if (ep == (struct exportlist *)NULL) {
1231                                 getexp_err(ep, tgrp);
1232                                 goto nextline;
1233                             }
1234
1235                             /*
1236                              * Get the host or netgroup.
1237                              */
1238                             setnetgrent(cp);
1239                             netgrp = getnetgrent(&hst, &usr, &dom);
1240                             do {
1241                                 if (has_host) {
1242                                     grp->gr_next = get_grp();
1243                                     grp = grp->gr_next;
1244                                 }
1245                                 if (netgrp) {
1246                                     if (hst == 0) {
1247                                         syslog(LOG_ERR,
1248                                 "null hostname in netgroup %s, skipping", cp);
1249                                         grp->gr_type = GT_IGNORE;
1250                                     } else if (get_host(hst, grp, tgrp)) {
1251                                         syslog(LOG_ERR,
1252                         "bad host %s in netgroup %s, skipping", hst, cp);
1253                                         grp->gr_type = GT_IGNORE;
1254                                     }
1255                                 } else if (get_host(cp, grp, tgrp)) {
1256                                     syslog(LOG_ERR, "bad host %s, skipping", cp);
1257                                     grp->gr_type = GT_IGNORE;
1258                                 }
1259                                 has_host = TRUE;
1260                             } while (netgrp && getnetgrent(&hst, &usr, &dom));
1261                             endnetgrent();
1262                             *endcp = savedc;
1263                         }
1264                         cp = endcp;
1265                         nextfield(&cp, &endcp);
1266                         len = endcp - cp;
1267                 }
1268                 if (check_options(dirhead)) {
1269                         getexp_err(ep, tgrp);
1270                         goto nextline;
1271                 }
1272                 if (!has_host) {
1273                         grp->gr_type = GT_DEFAULT;
1274                         if (debug)
1275                                 warnx("adding a default entry");
1276
1277                 /*
1278                  * Don't allow a network export coincide with a list of
1279                  * host(s) on the same line.
1280                  */
1281                 } else if ((opt_flags & OP_NET) && tgrp->gr_next) {
1282                         syslog(LOG_ERR, "network/host conflict");
1283                         getexp_err(ep, tgrp);
1284                         goto nextline;
1285
1286                 /*
1287                  * If an export list was specified on this line, make sure
1288                  * that we have at least one valid entry, otherwise skip it.
1289                  */
1290                 } else {
1291                         grp = tgrp;
1292                         while (grp && grp->gr_type == GT_IGNORE)
1293                                 grp = grp->gr_next;
1294                         if (! grp) {
1295                             getexp_err(ep, tgrp);
1296                             goto nextline;
1297                         }
1298                 }
1299
1300                 /*
1301                  * Loop through hosts, pushing the exports into the kernel.
1302                  * After loop, tgrp points to the start of the list and
1303                  * grp points to the last entry in the list.
1304                  */
1305                 grp = tgrp;
1306                 do {
1307                         if (do_mount(ep, grp, exflags, &anon, dirp, dirplen,
1308                             &fsb)) {
1309                                 getexp_err(ep, tgrp);
1310                                 goto nextline;
1311                         }
1312                 } while (grp->gr_next && (grp = grp->gr_next));
1313
1314                 /*
1315                  * Success. Update the data structures.
1316                  */
1317                 if (has_host) {
1318                         hang_dirp(dirhead, tgrp, ep, opt_flags);
1319                         grp->gr_next = grphead;
1320                         grphead = tgrp;
1321                 } else {
1322                         hang_dirp(dirhead, (struct grouplist *)NULL, ep,
1323                                 opt_flags);
1324                         free_grp(grp);
1325                 }
1326                 dirhead = (struct dirlist *)NULL;
1327                 if ((ep->ex_flag & EX_LINKED) == 0) {
1328                         ep2 = exphead;
1329                         epp = &exphead;
1330
1331                         /*
1332                          * Insert in the list in alphabetical order.
1333                          */
1334                         while (ep2 && strcmp(ep2->ex_fsdir, ep->ex_fsdir) < 0) {
1335                                 epp = &ep2->ex_next;
1336                                 ep2 = ep2->ex_next;
1337                         }
1338                         if (ep2)
1339                                 ep->ex_next = ep2;
1340                         *epp = ep;
1341                         ep->ex_flag |= EX_LINKED;
1342                 }
1343 nextline:
1344                 if (dirhead) {
1345                         free_dir(dirhead);
1346                         dirhead = (struct dirlist *)NULL;
1347                 }
1348         }
1349 }
1350
1351 /*
1352  * Get the export list from all specified files
1353  */
1354 void
1355 get_exportlist()
1356 {
1357         struct exportlist *ep, *ep2;
1358         struct grouplist *grp, *tgrp;
1359         struct export_args export;
1360         struct iovec *iov;
1361         struct statfs *fsp, *mntbufp;
1362         struct xvfsconf vfc;
1363         char *dirp;
1364         char errmsg[255];
1365         int dirplen, num, i;
1366         int iovlen;
1367         int done;
1368
1369         bzero(&export, sizeof(export));
1370         export.ex_flags = MNT_DELEXPORT;
1371         dirp = NULL;
1372         dirplen = 0;
1373         iov = NULL;
1374         iovlen = 0;
1375         bzero(errmsg, sizeof(errmsg));
1376
1377         /*
1378          * First, get rid of the old list
1379          */
1380         ep = exphead;
1381         while (ep) {
1382                 ep2 = ep;
1383                 ep = ep->ex_next;
1384                 free_exp(ep2);
1385         }
1386         exphead = (struct exportlist *)NULL;
1387
1388         grp = grphead;
1389         while (grp) {
1390                 tgrp = grp;
1391                 grp = grp->gr_next;
1392                 free_grp(tgrp);
1393         }
1394         grphead = (struct grouplist *)NULL;
1395
1396         /*
1397          * And delete exports that are in the kernel for all local
1398          * filesystems.
1399          * XXX: Should know how to handle all local exportable filesystems.
1400          */
1401         num = getmntinfo(&mntbufp, MNT_NOWAIT);
1402
1403         if (num > 0) {
1404                 build_iovec(&iov, &iovlen, "fstype", NULL, 0);
1405                 build_iovec(&iov, &iovlen, "fspath", NULL, 0);
1406                 build_iovec(&iov, &iovlen, "from", NULL, 0);
1407                 build_iovec(&iov, &iovlen, "update", NULL, 0);
1408                 build_iovec(&iov, &iovlen, "export", &export, sizeof(export));
1409                 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
1410         }
1411
1412         for (i = 0; i < num; i++) {
1413                 fsp = &mntbufp[i];
1414                 if (getvfsbyname(fsp->f_fstypename, &vfc) != 0) {
1415                         syslog(LOG_ERR, "getvfsbyname() failed for %s",
1416                             fsp->f_fstypename);
1417                         continue;
1418                 }
1419
1420                 /*
1421                  * Do not delete export for network filesystem by
1422                  * passing "export" arg to nmount().
1423                  * It only makes sense to do this for local filesystems.
1424                  */
1425                 if (vfc.vfc_flags & VFCF_NETWORK)
1426                         continue;
1427
1428                 iov[1].iov_base = fsp->f_fstypename;
1429                 iov[1].iov_len = strlen(fsp->f_fstypename) + 1;
1430                 iov[3].iov_base = fsp->f_mntonname;
1431                 iov[3].iov_len = strlen(fsp->f_mntonname) + 1;
1432                 iov[5].iov_base = fsp->f_mntfromname;
1433                 iov[5].iov_len = strlen(fsp->f_mntfromname) + 1;
1434
1435                 if (nmount(iov, iovlen, fsp->f_flags) < 0 &&
1436                     errno != ENOENT && errno != ENOTSUP) {
1437                         syslog(LOG_ERR,
1438                             "can't delete exports for %s: %m %s",
1439                             fsp->f_mntonname, errmsg);
1440                 }
1441         }
1442
1443         if (iov != NULL) {
1444                 /* Free strings allocated by strdup() in getmntopts.c */
1445                 free(iov[0].iov_base); /* fstype */
1446                 free(iov[2].iov_base); /* fspath */
1447                 free(iov[4].iov_base); /* from */
1448                 free(iov[6].iov_base); /* update */
1449                 free(iov[8].iov_base); /* export */
1450                 free(iov[10].iov_base); /* errmsg */
1451
1452                 /* free iov, allocated by realloc() */
1453                 free(iov);
1454                 iovlen = 0;
1455         }
1456
1457         /*
1458          * Read in the exports file and build the list, calling
1459          * nmount() as we go along to push the export rules into the kernel.
1460          */
1461         done = 0;
1462         for (i = 0; exnames[i] != NULL; i++) {
1463                 if (debug)
1464                         warnx("reading exports from %s", exnames[i]);
1465                 if ((exp_file = fopen(exnames[i], "r")) == NULL) {
1466                         syslog(LOG_WARNING, "can't open %s", exnames[i]);
1467                         continue;
1468                 }
1469                 get_exportlist_one();
1470                 fclose(exp_file);
1471                 done++;
1472         }
1473         if (done == 0) {
1474                 syslog(LOG_ERR, "can't open any exports file");
1475                 exit(2);
1476         }
1477 }
1478
1479 /*
1480  * Allocate an export list element
1481  */
1482 struct exportlist *
1483 get_exp()
1484 {
1485         struct exportlist *ep;
1486
1487         ep = (struct exportlist *)malloc(sizeof (struct exportlist));
1488         if (ep == (struct exportlist *)NULL)
1489                 out_of_mem();
1490         memset(ep, 0, sizeof(struct exportlist));
1491         return (ep);
1492 }
1493
1494 /*
1495  * Allocate a group list element
1496  */
1497 struct grouplist *
1498 get_grp()
1499 {
1500         struct grouplist *gp;
1501
1502         gp = (struct grouplist *)malloc(sizeof (struct grouplist));
1503         if (gp == (struct grouplist *)NULL)
1504                 out_of_mem();
1505         memset(gp, 0, sizeof(struct grouplist));
1506         return (gp);
1507 }
1508
1509 /*
1510  * Clean up upon an error in get_exportlist().
1511  */
1512 void
1513 getexp_err(ep, grp)
1514         struct exportlist *ep;
1515         struct grouplist *grp;
1516 {
1517         struct grouplist *tgrp;
1518
1519         if (!(opt_flags & OP_QUIET))
1520                 syslog(LOG_ERR, "bad exports list line %s", line);
1521         if (ep && (ep->ex_flag & EX_LINKED) == 0)
1522                 free_exp(ep);
1523         while (grp) {
1524                 tgrp = grp;
1525                 grp = grp->gr_next;
1526                 free_grp(tgrp);
1527         }
1528 }
1529
1530 /*
1531  * Search the export list for a matching fs.
1532  */
1533 struct exportlist *
1534 ex_search(fsid)
1535         fsid_t *fsid;
1536 {
1537         struct exportlist *ep;
1538
1539         ep = exphead;
1540         while (ep) {
1541                 if (ep->ex_fs.val[0] == fsid->val[0] &&
1542                     ep->ex_fs.val[1] == fsid->val[1])
1543                         return (ep);
1544                 ep = ep->ex_next;
1545         }
1546         return (ep);
1547 }
1548
1549 /*
1550  * Add a directory path to the list.
1551  */
1552 char *
1553 add_expdir(dpp, cp, len)
1554         struct dirlist **dpp;
1555         char *cp;
1556         int len;
1557 {
1558         struct dirlist *dp;
1559
1560         dp = (struct dirlist *)malloc(sizeof (struct dirlist) + len);
1561         if (dp == (struct dirlist *)NULL)
1562                 out_of_mem();
1563         dp->dp_left = *dpp;
1564         dp->dp_right = (struct dirlist *)NULL;
1565         dp->dp_flag = 0;
1566         dp->dp_hosts = (struct hostlist *)NULL;
1567         strcpy(dp->dp_dirp, cp);
1568         *dpp = dp;
1569         return (dp->dp_dirp);
1570 }
1571
1572 /*
1573  * Hang the dir list element off the dirpath binary tree as required
1574  * and update the entry for host.
1575  */
1576 void
1577 hang_dirp(dp, grp, ep, flags)
1578         struct dirlist *dp;
1579         struct grouplist *grp;
1580         struct exportlist *ep;
1581         int flags;
1582 {
1583         struct hostlist *hp;
1584         struct dirlist *dp2;
1585
1586         if (flags & OP_ALLDIRS) {
1587                 if (ep->ex_defdir)
1588                         free((caddr_t)dp);
1589                 else
1590                         ep->ex_defdir = dp;
1591                 if (grp == (struct grouplist *)NULL) {
1592                         ep->ex_defdir->dp_flag |= DP_DEFSET;
1593                 } else while (grp) {
1594                         hp = get_ht();
1595                         hp->ht_grp = grp;
1596                         hp->ht_next = ep->ex_defdir->dp_hosts;
1597                         ep->ex_defdir->dp_hosts = hp;
1598                         grp = grp->gr_next;
1599                 }
1600         } else {
1601
1602                 /*
1603                  * Loop through the directories adding them to the tree.
1604                  */
1605                 while (dp) {
1606                         dp2 = dp->dp_left;
1607                         add_dlist(&ep->ex_dirl, dp, grp, flags);
1608                         dp = dp2;
1609                 }
1610         }
1611 }
1612
1613 /*
1614  * Traverse the binary tree either updating a node that is already there
1615  * for the new directory or adding the new node.
1616  */
1617 void
1618 add_dlist(dpp, newdp, grp, flags)
1619         struct dirlist **dpp;
1620         struct dirlist *newdp;
1621         struct grouplist *grp;
1622         int flags;
1623 {
1624         struct dirlist *dp;
1625         struct hostlist *hp;
1626         int cmp;
1627
1628         dp = *dpp;
1629         if (dp) {
1630                 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp);
1631                 if (cmp > 0) {
1632                         add_dlist(&dp->dp_left, newdp, grp, flags);
1633                         return;
1634                 } else if (cmp < 0) {
1635                         add_dlist(&dp->dp_right, newdp, grp, flags);
1636                         return;
1637                 } else
1638                         free((caddr_t)newdp);
1639         } else {
1640                 dp = newdp;
1641                 dp->dp_left = (struct dirlist *)NULL;
1642                 *dpp = dp;
1643         }
1644         if (grp) {
1645
1646                 /*
1647                  * Hang all of the host(s) off of the directory point.
1648                  */
1649                 do {
1650                         hp = get_ht();
1651                         hp->ht_grp = grp;
1652                         hp->ht_next = dp->dp_hosts;
1653                         dp->dp_hosts = hp;
1654                         grp = grp->gr_next;
1655                 } while (grp);
1656         } else {
1657                 dp->dp_flag |= DP_DEFSET;
1658         }
1659 }
1660
1661 /*
1662  * Search for a dirpath on the export point.
1663  */
1664 struct dirlist *
1665 dirp_search(dp, dirp)
1666         struct dirlist *dp;
1667         char *dirp;
1668 {
1669         int cmp;
1670
1671         if (dp) {
1672                 cmp = strcmp(dp->dp_dirp, dirp);
1673                 if (cmp > 0)
1674                         return (dirp_search(dp->dp_left, dirp));
1675                 else if (cmp < 0)
1676                         return (dirp_search(dp->dp_right, dirp));
1677                 else
1678                         return (dp);
1679         }
1680         return (dp);
1681 }
1682
1683 /*
1684  * Scan for a host match in a directory tree.
1685  */
1686 int
1687 chk_host(dp, saddr, defsetp, hostsetp)
1688         struct dirlist *dp;
1689         struct sockaddr *saddr;
1690         int *defsetp;
1691         int *hostsetp;
1692 {
1693         struct hostlist *hp;
1694         struct grouplist *grp;
1695         struct addrinfo *ai;
1696
1697         if (dp) {
1698                 if (dp->dp_flag & DP_DEFSET)
1699                         *defsetp = dp->dp_flag;
1700                 hp = dp->dp_hosts;
1701                 while (hp) {
1702                         grp = hp->ht_grp;
1703                         switch (grp->gr_type) {
1704                         case GT_HOST:
1705                                 ai = grp->gr_ptr.gt_addrinfo;
1706                                 for (; ai; ai = ai->ai_next) {
1707                                         if (!sacmp(ai->ai_addr, saddr, NULL)) {
1708                                                 *hostsetp =
1709                                                     (hp->ht_flag | DP_HOSTSET);
1710                                                 return (1);
1711                                         }
1712                                 }
1713                                 break;
1714                         case GT_NET:
1715                                 if (!sacmp(saddr, (struct sockaddr *)
1716                                     &grp->gr_ptr.gt_net.nt_net,
1717                                     (struct sockaddr *)
1718                                     &grp->gr_ptr.gt_net.nt_mask)) {
1719                                         *hostsetp = (hp->ht_flag | DP_HOSTSET);
1720                                         return (1);
1721                                 }
1722                                 break;
1723                         }
1724                         hp = hp->ht_next;
1725                 }
1726         }
1727         return (0);
1728 }
1729
1730 /*
1731  * Scan tree for a host that matches the address.
1732  */
1733 int
1734 scan_tree(dp, saddr)
1735         struct dirlist *dp;
1736         struct sockaddr *saddr;
1737 {
1738         int defset, hostset;
1739
1740         if (dp) {
1741                 if (scan_tree(dp->dp_left, saddr))
1742                         return (1);
1743                 if (chk_host(dp, saddr, &defset, &hostset))
1744                         return (1);
1745                 if (scan_tree(dp->dp_right, saddr))
1746                         return (1);
1747         }
1748         return (0);
1749 }
1750
1751 /*
1752  * Traverse the dirlist tree and free it up.
1753  */
1754 void
1755 free_dir(dp)
1756         struct dirlist *dp;
1757 {
1758
1759         if (dp) {
1760                 free_dir(dp->dp_left);
1761                 free_dir(dp->dp_right);
1762                 free_host(dp->dp_hosts);
1763                 free((caddr_t)dp);
1764         }
1765 }
1766
1767 /*
1768  * Parse the option string and update fields.
1769  * Option arguments may either be -<option>=<value> or
1770  * -<option> <value>
1771  */
1772 int
1773 do_opt(cpp, endcpp, ep, grp, has_hostp, exflagsp, cr)
1774         char **cpp, **endcpp;
1775         struct exportlist *ep;
1776         struct grouplist *grp;
1777         int *has_hostp;
1778         int *exflagsp;
1779         struct xucred *cr;
1780 {
1781         char *cpoptarg, *cpoptend;
1782         char *cp, *endcp, *cpopt, savedc, savedc2;
1783         int allflag, usedarg;
1784
1785         savedc2 = '\0';
1786         cpopt = *cpp;
1787         cpopt++;
1788         cp = *endcpp;
1789         savedc = *cp;
1790         *cp = '\0';
1791         while (cpopt && *cpopt) {
1792                 allflag = 1;
1793                 usedarg = -2;
1794                 if ((cpoptend = strchr(cpopt, ','))) {
1795                         *cpoptend++ = '\0';
1796                         if ((cpoptarg = strchr(cpopt, '=')))
1797                                 *cpoptarg++ = '\0';
1798                 } else {
1799                         if ((cpoptarg = strchr(cpopt, '=')))
1800                                 *cpoptarg++ = '\0';
1801                         else {
1802                                 *cp = savedc;
1803                                 nextfield(&cp, &endcp);
1804                                 **endcpp = '\0';
1805                                 if (endcp > cp && *cp != '-') {
1806                                         cpoptarg = cp;
1807                                         savedc2 = *endcp;
1808                                         *endcp = '\0';
1809                                         usedarg = 0;
1810                                 }
1811                         }
1812                 }
1813                 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) {
1814                         *exflagsp |= MNT_EXRDONLY;
1815                 } else if (cpoptarg && (!strcmp(cpopt, "maproot") ||
1816                     !(allflag = strcmp(cpopt, "mapall")) ||
1817                     !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) {
1818                         usedarg++;
1819                         parsecred(cpoptarg, cr);
1820                         if (allflag == 0) {
1821                                 *exflagsp |= MNT_EXPORTANON;
1822                                 opt_flags |= OP_MAPALL;
1823                         } else
1824                                 opt_flags |= OP_MAPROOT;
1825                 } else if (cpoptarg && (!strcmp(cpopt, "mask") ||
1826                     !strcmp(cpopt, "m"))) {
1827                         if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) {
1828                                 syslog(LOG_ERR, "bad mask: %s", cpoptarg);
1829                                 return (1);
1830                         }
1831                         usedarg++;
1832                         opt_flags |= OP_MASK;
1833                 } else if (cpoptarg && (!strcmp(cpopt, "network") ||
1834                         !strcmp(cpopt, "n"))) {
1835                         if (strchr(cpoptarg, '/') != NULL) {
1836                                 if (debug)
1837                                         fprintf(stderr, "setting OP_MASKLEN\n");
1838                                 opt_flags |= OP_MASKLEN;
1839                         }
1840                         if (grp->gr_type != GT_NULL) {
1841                                 syslog(LOG_ERR, "network/host conflict");
1842                                 return (1);
1843                         } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) {
1844                                 syslog(LOG_ERR, "bad net: %s", cpoptarg);
1845                                 return (1);
1846                         }
1847                         grp->gr_type = GT_NET;
1848                         *has_hostp = 1;
1849                         usedarg++;
1850                         opt_flags |= OP_NET;
1851                 } else if (!strcmp(cpopt, "alldirs")) {
1852                         opt_flags |= OP_ALLDIRS;
1853                 } else if (!strcmp(cpopt, "public")) {
1854                         *exflagsp |= MNT_EXPUBLIC;
1855                 } else if (!strcmp(cpopt, "webnfs")) {
1856                         *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON);
1857                         opt_flags |= OP_MAPALL;
1858                 } else if (cpoptarg && !strcmp(cpopt, "index")) {
1859                         ep->ex_indexfile = strdup(cpoptarg);
1860                 } else if (!strcmp(cpopt, "quiet")) {
1861                         opt_flags |= OP_QUIET;
1862                 } else {
1863                         syslog(LOG_ERR, "bad opt %s", cpopt);
1864                         return (1);
1865                 }
1866                 if (usedarg >= 0) {
1867                         *endcp = savedc2;
1868                         **endcpp = savedc;
1869                         if (usedarg > 0) {
1870                                 *cpp = cp;
1871                                 *endcpp = endcp;
1872                         }
1873                         return (0);
1874                 }
1875                 cpopt = cpoptend;
1876         }
1877         **endcpp = savedc;
1878         return (0);
1879 }
1880
1881 /*
1882  * Translate a character string to the corresponding list of network
1883  * addresses for a hostname.
1884  */
1885 int
1886 get_host(cp, grp, tgrp)
1887         char *cp;
1888         struct grouplist *grp;
1889         struct grouplist *tgrp;
1890 {
1891         struct grouplist *checkgrp;
1892         struct addrinfo *ai, *tai, hints;
1893         int ecode;
1894         char host[NI_MAXHOST];
1895
1896         if (grp->gr_type != GT_NULL) {
1897                 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp);
1898                 return (1);
1899         }
1900         memset(&hints, 0, sizeof hints);
1901         hints.ai_flags = AI_CANONNAME;
1902         hints.ai_protocol = IPPROTO_UDP;
1903         ecode = getaddrinfo(cp, NULL, &hints, &ai);
1904         if (ecode != 0) {
1905                 syslog(LOG_ERR,"can't get address info for host %s", cp);
1906                 return 1;
1907         }
1908         grp->gr_ptr.gt_addrinfo = ai;
1909         while (ai != NULL) {
1910                 if (ai->ai_canonname == NULL) {
1911                         if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host,
1912                             sizeof host, NULL, 0, NI_NUMERICHOST) != 0)
1913                                 strlcpy(host, "?", sizeof(host));
1914                         ai->ai_canonname = strdup(host);
1915                         ai->ai_flags |= AI_CANONNAME;
1916                 }
1917                 if (debug)
1918                         fprintf(stderr, "got host %s\n", ai->ai_canonname);
1919                 /*
1920                  * Sanity check: make sure we don't already have an entry
1921                  * for this host in the grouplist.
1922                  */
1923                 for (checkgrp = tgrp; checkgrp != NULL;
1924                     checkgrp = checkgrp->gr_next) {
1925                         if (checkgrp->gr_type != GT_HOST)
1926                                 continue;
1927                         for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL;
1928                             tai = tai->ai_next) {
1929                                 if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0)
1930                                         continue;
1931                                 if (debug)
1932                                         fprintf(stderr,
1933                                             "ignoring duplicate host %s\n",
1934                                             ai->ai_canonname);
1935                                 grp->gr_type = GT_IGNORE;
1936                                 return (0);
1937                         }
1938                 }
1939                 ai = ai->ai_next;
1940         }
1941         grp->gr_type = GT_HOST;
1942         return (0);
1943 }
1944
1945 /*
1946  * Free up an exports list component
1947  */
1948 void
1949 free_exp(ep)
1950         struct exportlist *ep;
1951 {
1952
1953         if (ep->ex_defdir) {
1954                 free_host(ep->ex_defdir->dp_hosts);
1955                 free((caddr_t)ep->ex_defdir);
1956         }
1957         if (ep->ex_fsdir)
1958                 free(ep->ex_fsdir);
1959         if (ep->ex_indexfile)
1960                 free(ep->ex_indexfile);
1961         free_dir(ep->ex_dirl);
1962         free((caddr_t)ep);
1963 }
1964
1965 /*
1966  * Free hosts.
1967  */
1968 void
1969 free_host(hp)
1970         struct hostlist *hp;
1971 {
1972         struct hostlist *hp2;
1973
1974         while (hp) {
1975                 hp2 = hp;
1976                 hp = hp->ht_next;
1977                 free((caddr_t)hp2);
1978         }
1979 }
1980
1981 struct hostlist *
1982 get_ht()
1983 {
1984         struct hostlist *hp;
1985
1986         hp = (struct hostlist *)malloc(sizeof (struct hostlist));
1987         if (hp == (struct hostlist *)NULL)
1988                 out_of_mem();
1989         hp->ht_next = (struct hostlist *)NULL;
1990         hp->ht_flag = 0;
1991         return (hp);
1992 }
1993
1994 /*
1995  * Out of memory, fatal
1996  */
1997 void
1998 out_of_mem()
1999 {
2000
2001         syslog(LOG_ERR, "out of memory");
2002         exit(2);
2003 }
2004
2005 /*
2006  * Do the nmount() syscall with the update flag to push the export info into
2007  * the kernel.
2008  */
2009 int
2010 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags,
2011     struct xucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb)
2012 {
2013         struct statfs fsb1;
2014         struct addrinfo *ai;
2015         struct export_args eap;
2016         char errmsg[255];
2017         char *cp;
2018         int done;
2019         char savedc;
2020         struct iovec *iov;
2021         int iovlen;
2022         int ret;
2023
2024         cp = NULL;
2025         savedc = '\0';
2026         iov = NULL;
2027         iovlen = 0;
2028         ret = 0;
2029
2030         bzero(&eap, sizeof(eap));
2031         bzero(errmsg, sizeof(errmsg));
2032         eap.ex_flags = exflags;
2033         eap.ex_anon = *anoncrp;
2034         eap.ex_indexfile = ep->ex_indexfile;
2035         if (grp->gr_type == GT_HOST)
2036                 ai = grp->gr_ptr.gt_addrinfo;
2037         else
2038                 ai = NULL;
2039         done = FALSE;
2040
2041         build_iovec(&iov, &iovlen, "fstype", NULL, 0);
2042         build_iovec(&iov, &iovlen, "fspath", NULL, 0);
2043         build_iovec(&iov, &iovlen, "from", NULL, 0);
2044         build_iovec(&iov, &iovlen, "update", NULL, 0);
2045         build_iovec(&iov, &iovlen, "export", &eap, sizeof(eap));
2046         build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
2047
2048         while (!done) {
2049                 switch (grp->gr_type) {
2050                 case GT_HOST:
2051                         if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0)
2052                                 goto skip;
2053                         eap.ex_addr = ai->ai_addr;
2054                         eap.ex_addrlen = ai->ai_addrlen;
2055                         eap.ex_masklen = 0;
2056                         break;
2057                 case GT_NET:
2058                         if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 &&
2059                             have_v6 == 0)
2060                                 goto skip;
2061                         eap.ex_addr =
2062                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net;
2063                         eap.ex_addrlen =
2064                             ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_net)->sa_len;
2065                         eap.ex_mask =
2066                             (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask;
2067                         eap.ex_masklen = ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask)->sa_len;
2068                         break;
2069                 case GT_DEFAULT:
2070                         eap.ex_addr = NULL;
2071                         eap.ex_addrlen = 0;
2072                         eap.ex_mask = NULL;
2073                         eap.ex_masklen = 0;
2074                         break;
2075                 case GT_IGNORE:
2076                         ret = 0;
2077                         goto error_exit;
2078                         break;
2079                 default:
2080                         syslog(LOG_ERR, "bad grouptype");
2081                         if (cp)
2082                                 *cp = savedc;
2083                         ret = 1;
2084                         goto error_exit;
2085                 };
2086
2087                 /*
2088                  * XXX:
2089                  * Maybe I should just use the fsb->f_mntonname path instead
2090                  * of looping back up the dirp to the mount point??
2091                  * Also, needs to know how to export all types of local
2092                  * exportable filesystems and not just "ufs".
2093                  */
2094                 iov[1].iov_base = fsb->f_fstypename; /* "fstype" */
2095                 iov[1].iov_len = strlen(fsb->f_fstypename) + 1;
2096                 iov[3].iov_base = fsb->f_mntonname; /* "fspath" */
2097                 iov[3].iov_len = strlen(fsb->f_mntonname) + 1;
2098                 iov[5].iov_base = fsb->f_mntfromname; /* "from" */
2099                 iov[5].iov_len = strlen(fsb->f_mntfromname) + 1;
2100
2101                 while (nmount(iov, iovlen, fsb->f_flags) < 0) {
2102                         if (cp)
2103                                 *cp-- = savedc;
2104                         else
2105                                 cp = dirp + dirplen - 1;
2106                         if (opt_flags & OP_QUIET) {
2107                                 ret = 1;
2108                                 goto error_exit;
2109                         }
2110                         if (errno == EPERM) {
2111                                 if (debug)
2112                                         warnx("can't change attributes for %s",
2113                                             dirp);
2114                                 syslog(LOG_ERR,
2115                                    "can't change attributes for %s", dirp);
2116                                 ret = 1;
2117                                 goto error_exit;
2118                         }
2119                         if (opt_flags & OP_ALLDIRS) {
2120                                 if (errno == EINVAL)
2121                                         syslog(LOG_ERR,
2122                 "-alldirs requested but %s is not a filesystem mountpoint",
2123                                                 dirp);
2124                                 else
2125                                         syslog(LOG_ERR,
2126                                                 "could not remount %s: %m",
2127                                                 dirp);
2128                                 ret = 1;
2129                                 goto error_exit;
2130                         }
2131                         /* back up over the last component */
2132                         while (*cp == '/' && cp > dirp)
2133                                 cp--;
2134                         while (*(cp - 1) != '/' && cp > dirp)
2135                                 cp--;
2136                         if (cp == dirp) {
2137                                 if (debug)
2138                                         warnx("mnt unsucc");
2139                                 syslog(LOG_ERR, "can't export %s %s", dirp,
2140                                     errmsg);
2141                                 ret = 1;
2142                                 goto error_exit;
2143                         }
2144                         savedc = *cp;
2145                         *cp = '\0';
2146                         /* Check that we're still on the same filesystem. */
2147                         if (statfs(dirp, &fsb1) != 0 || bcmp(&fsb1.f_fsid,
2148                             &fsb->f_fsid, sizeof(fsb1.f_fsid)) != 0) {
2149                                 *cp = savedc;
2150                                 syslog(LOG_ERR, "can't export %s %s", dirp,
2151                                     errmsg);
2152                                 ret = 1;
2153                                 goto error_exit;
2154                         }
2155                 }
2156 skip:
2157                 if (ai != NULL)
2158                         ai = ai->ai_next;
2159                 if (ai == NULL)
2160                         done = TRUE;
2161         }
2162         if (cp)
2163                 *cp = savedc;
2164 error_exit:
2165         /* free strings allocated by strdup() in getmntopts.c */
2166         if (iov != NULL) {
2167                 free(iov[0].iov_base); /* fstype */
2168                 free(iov[2].iov_base); /* fspath */
2169                 free(iov[4].iov_base); /* from */
2170                 free(iov[6].iov_base); /* update */
2171                 free(iov[8].iov_base); /* export */
2172                 free(iov[10].iov_base); /* errmsg */
2173
2174                 /* free iov, allocated by realloc() */
2175                 free(iov);
2176         }
2177         return (ret);
2178 }
2179
2180 /*
2181  * Translate a net address.
2182  *
2183  * If `maskflg' is nonzero, then `cp' is a netmask, not a network address.
2184  */
2185 int
2186 get_net(cp, net, maskflg)
2187         char *cp;
2188         struct netmsk *net;
2189         int maskflg;
2190 {
2191         struct netent *np = NULL;
2192         char *name, *p, *prefp;
2193         struct sockaddr_in sin;
2194         struct sockaddr *sa = NULL;
2195         struct addrinfo hints, *ai = NULL;
2196         char netname[NI_MAXHOST];
2197         long preflen;
2198
2199         p = prefp = NULL;
2200         if ((opt_flags & OP_MASKLEN) && !maskflg) {
2201                 p = strchr(cp, '/');
2202                 *p = '\0';
2203                 prefp = p + 1;
2204         }
2205
2206         /*
2207          * Check for a numeric address first. We wish to avoid
2208          * possible DNS lookups in getnetbyname().
2209          */
2210         if (isxdigit(*cp) || *cp == ':') {
2211                 memset(&hints, 0, sizeof hints);
2212                 /* Ensure the mask and the network have the same family. */
2213                 if (maskflg && (opt_flags & OP_NET))
2214                         hints.ai_family = net->nt_net.ss_family;
2215                 else if (!maskflg && (opt_flags & OP_HAVEMASK))
2216                         hints.ai_family = net->nt_mask.ss_family;
2217                 else
2218                         hints.ai_family = AF_UNSPEC;
2219                 hints.ai_flags = AI_NUMERICHOST;
2220                 if (getaddrinfo(cp, NULL, &hints, &ai) == 0)
2221                         sa = ai->ai_addr;
2222                 if (sa != NULL && ai->ai_family == AF_INET) {
2223                         /*
2224                          * The address in `cp' is really a network address, so
2225                          * use inet_network() to re-interpret this correctly.
2226                          * e.g. "127.1" means 127.1.0.0, not 127.0.0.1.
2227                          */
2228                         bzero(&sin, sizeof sin);
2229                         sin.sin_family = AF_INET;
2230                         sin.sin_len = sizeof sin;
2231                         sin.sin_addr = inet_makeaddr(inet_network(cp), 0);
2232                         if (debug)
2233                                 fprintf(stderr, "get_net: v4 addr %s\n",
2234                                     inet_ntoa(sin.sin_addr));
2235                         sa = (struct sockaddr *)&sin;
2236                 }
2237         }
2238         if (sa == NULL && (np = getnetbyname(cp)) != NULL) {
2239                 bzero(&sin, sizeof sin);
2240                 sin.sin_family = AF_INET;
2241                 sin.sin_len = sizeof sin;
2242                 sin.sin_addr = inet_makeaddr(np->n_net, 0);
2243                 sa = (struct sockaddr *)&sin;
2244         }
2245         if (sa == NULL)
2246                 goto fail;
2247
2248         if (maskflg) {
2249                 /* The specified sockaddr is a mask. */
2250                 if (checkmask(sa) != 0)
2251                         goto fail;
2252                 bcopy(sa, &net->nt_mask, sa->sa_len);
2253                 opt_flags |= OP_HAVEMASK;
2254         } else {
2255                 /* The specified sockaddr is a network address. */
2256                 bcopy(sa, &net->nt_net, sa->sa_len);
2257
2258                 /* Get a network name for the export list. */
2259                 if (np) {
2260                         name = np->n_name;
2261                 } else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname,
2262                    NULL, 0, NI_NUMERICHOST) == 0) {
2263                         name = netname;
2264                 } else {
2265                         goto fail;
2266                 }
2267                 if ((net->nt_name = strdup(name)) == NULL)
2268                         out_of_mem();
2269
2270                 /*
2271                  * Extract a mask from either a "/<masklen>" suffix, or
2272                  * from the class of an IPv4 address.
2273                  */
2274                 if (opt_flags & OP_MASKLEN) {
2275                         preflen = strtol(prefp, NULL, 10);
2276                         if (preflen < 0L || preflen == LONG_MAX)
2277                                 goto fail;
2278                         bcopy(sa, &net->nt_mask, sa->sa_len);
2279                         if (makemask(&net->nt_mask, (int)preflen) != 0)
2280                                 goto fail;
2281                         opt_flags |= OP_HAVEMASK;
2282                         *p = '/';
2283                 } else if (sa->sa_family == AF_INET &&
2284                     (opt_flags & OP_MASK) == 0) {
2285                         in_addr_t addr;
2286
2287                         addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
2288                         if (IN_CLASSA(addr))
2289                                 preflen = 8;
2290                         else if (IN_CLASSB(addr))
2291                                 preflen = 16;
2292                         else if (IN_CLASSC(addr))
2293                                 preflen = 24;
2294                         else if (IN_CLASSD(addr))
2295                                 preflen = 28;
2296                         else
2297                                 preflen = 32;   /* XXX */
2298
2299                         bcopy(sa, &net->nt_mask, sa->sa_len);
2300                         makemask(&net->nt_mask, (int)preflen);
2301                         opt_flags |= OP_HAVEMASK;
2302                 }
2303         }
2304
2305         if (ai)
2306                 freeaddrinfo(ai);
2307         return 0;
2308
2309 fail:
2310         if (ai)
2311                 freeaddrinfo(ai);
2312         return 1;
2313 }
2314
2315 /*
2316  * Parse out the next white space separated field
2317  */
2318 void
2319 nextfield(cp, endcp)
2320         char **cp;
2321         char **endcp;
2322 {
2323         char *p;
2324
2325         p = *cp;
2326         while (*p == ' ' || *p == '\t')
2327                 p++;
2328         if (*p == '\n' || *p == '\0')
2329                 *cp = *endcp = p;
2330         else {
2331                 *cp = p++;
2332                 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0')
2333                         p++;
2334                 *endcp = p;
2335         }
2336 }
2337
2338 /*
2339  * Get an exports file line. Skip over blank lines and handle line
2340  * continuations.
2341  */
2342 int
2343 get_line()
2344 {
2345         char *p, *cp;
2346         size_t len;
2347         int totlen, cont_line;
2348
2349         /*
2350          * Loop around ignoring blank lines and getting all continuation lines.
2351          */
2352         p = line;
2353         totlen = 0;
2354         do {
2355                 if ((p = fgetln(exp_file, &len)) == NULL)
2356                         return (0);
2357                 cp = p + len - 1;
2358                 cont_line = 0;
2359                 while (cp >= p &&
2360                     (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) {
2361                         if (*cp == '\\')
2362                                 cont_line = 1;
2363                         cp--;
2364                         len--;
2365                 }
2366                 if (cont_line) {
2367                         *++cp = ' ';
2368                         len++;
2369                 }
2370                 if (linesize < len + totlen + 1) {
2371                         linesize = len + totlen + 1;
2372                         line = realloc(line, linesize);
2373                         if (line == NULL)
2374                                 out_of_mem();
2375                 }
2376                 memcpy(line + totlen, p, len);
2377                 totlen += len;
2378                 line[totlen] = '\0';
2379         } while (totlen == 0 || cont_line);
2380         return (1);
2381 }
2382
2383 /*
2384  * Parse a description of a credential.
2385  */
2386 void
2387 parsecred(namelist, cr)
2388         char *namelist;
2389         struct xucred *cr;
2390 {
2391         char *name;
2392         int cnt;
2393         char *names;
2394         struct passwd *pw;
2395         struct group *gr;
2396         gid_t groups[NGROUPS + 1];
2397         int ngroups;
2398
2399         cr->cr_version = XUCRED_VERSION;
2400         /*
2401          * Set up the unprivileged user.
2402          */
2403         cr->cr_uid = -2;
2404         cr->cr_groups[0] = -2;
2405         cr->cr_ngroups = 1;
2406         /*
2407          * Get the user's password table entry.
2408          */
2409         names = strsep(&namelist, " \t\n");
2410         name = strsep(&names, ":");
2411         if (isdigit(*name) || *name == '-')
2412                 pw = getpwuid(atoi(name));
2413         else
2414                 pw = getpwnam(name);
2415         /*
2416          * Credentials specified as those of a user.
2417          */
2418         if (names == NULL) {
2419                 if (pw == NULL) {
2420                         syslog(LOG_ERR, "unknown user: %s", name);
2421                         return;
2422                 }
2423                 cr->cr_uid = pw->pw_uid;
2424                 ngroups = NGROUPS + 1;
2425                 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups))
2426                         syslog(LOG_ERR, "too many groups");
2427                 /*
2428                  * Compress out duplicate.
2429                  */
2430                 cr->cr_ngroups = ngroups - 1;
2431                 cr->cr_groups[0] = groups[0];
2432                 for (cnt = 2; cnt < ngroups; cnt++)
2433                         cr->cr_groups[cnt - 1] = groups[cnt];
2434                 return;
2435         }
2436         /*
2437          * Explicit credential specified as a colon separated list:
2438          *      uid:gid:gid:...
2439          */
2440         if (pw != NULL)
2441                 cr->cr_uid = pw->pw_uid;
2442         else if (isdigit(*name) || *name == '-')
2443                 cr->cr_uid = atoi(name);
2444         else {
2445                 syslog(LOG_ERR, "unknown user: %s", name);
2446                 return;
2447         }
2448         cr->cr_ngroups = 0;
2449         while (names != NULL && *names != '\0' && cr->cr_ngroups < NGROUPS) {
2450                 name = strsep(&names, ":");
2451                 if (isdigit(*name) || *name == '-') {
2452                         cr->cr_groups[cr->cr_ngroups++] = atoi(name);
2453                 } else {
2454                         if ((gr = getgrnam(name)) == NULL) {
2455                                 syslog(LOG_ERR, "unknown group: %s", name);
2456                                 continue;
2457                         }
2458                         cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid;
2459                 }
2460         }
2461         if (names != NULL && *names != '\0' && cr->cr_ngroups == NGROUPS)
2462                 syslog(LOG_ERR, "too many groups");
2463 }
2464
2465 #define STRSIZ  (RPCMNT_NAMELEN+RPCMNT_PATHLEN+50)
2466 /*
2467  * Routines that maintain the remote mounttab
2468  */
2469 void
2470 get_mountlist()
2471 {
2472         struct mountlist *mlp, **mlpp;
2473         char *host, *dirp, *cp;
2474         char str[STRSIZ];
2475         FILE *mlfile;
2476
2477         if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) {
2478                 if (errno == ENOENT)
2479                         return;
2480                 else {
2481                         syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST);
2482                         return;
2483                 }
2484         }
2485         mlpp = &mlhead;
2486         while (fgets(str, STRSIZ, mlfile) != NULL) {
2487                 cp = str;
2488                 host = strsep(&cp, " \t\n");
2489                 dirp = strsep(&cp, " \t\n");
2490                 if (host == NULL || dirp == NULL)
2491                         continue;
2492                 mlp = (struct mountlist *)malloc(sizeof (*mlp));
2493                 if (mlp == (struct mountlist *)NULL)
2494                         out_of_mem();
2495                 strncpy(mlp->ml_host, host, RPCMNT_NAMELEN);
2496                 mlp->ml_host[RPCMNT_NAMELEN] = '\0';
2497                 strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN);
2498                 mlp->ml_dirp[RPCMNT_PATHLEN] = '\0';
2499                 mlp->ml_next = (struct mountlist *)NULL;
2500                 *mlpp = mlp;
2501                 mlpp = &mlp->ml_next;
2502         }
2503         fclose(mlfile);
2504 }
2505
2506 void
2507 del_mlist(char *hostp, char *dirp)
2508 {
2509         struct mountlist *mlp, **mlpp;
2510         struct mountlist *mlp2;
2511         FILE *mlfile;
2512         int fnd = 0;
2513
2514         mlpp = &mlhead;
2515         mlp = mlhead;
2516         while (mlp) {
2517                 if (!strcmp(mlp->ml_host, hostp) &&
2518                     (!dirp || !strcmp(mlp->ml_dirp, dirp))) {
2519                         fnd = 1;
2520                         mlp2 = mlp;
2521                         *mlpp = mlp = mlp->ml_next;
2522                         free((caddr_t)mlp2);
2523                 } else {
2524                         mlpp = &mlp->ml_next;
2525                         mlp = mlp->ml_next;
2526                 }
2527         }
2528         if (fnd) {
2529                 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) {
2530                         syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST);
2531                         return;
2532                 }
2533                 mlp = mlhead;
2534                 while (mlp) {
2535                         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
2536                         mlp = mlp->ml_next;
2537                 }
2538                 fclose(mlfile);
2539         }
2540 }
2541
2542 void
2543 add_mlist(hostp, dirp)
2544         char *hostp, *dirp;
2545 {
2546         struct mountlist *mlp, **mlpp;
2547         FILE *mlfile;
2548
2549         mlpp = &mlhead;
2550         mlp = mlhead;
2551         while (mlp) {
2552                 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp))
2553                         return;
2554                 mlpp = &mlp->ml_next;
2555                 mlp = mlp->ml_next;
2556         }
2557         mlp = (struct mountlist *)malloc(sizeof (*mlp));
2558         if (mlp == (struct mountlist *)NULL)
2559                 out_of_mem();
2560         strncpy(mlp->ml_host, hostp, RPCMNT_NAMELEN);
2561         mlp->ml_host[RPCMNT_NAMELEN] = '\0';
2562         strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN);
2563         mlp->ml_dirp[RPCMNT_PATHLEN] = '\0';
2564         mlp->ml_next = (struct mountlist *)NULL;
2565         *mlpp = mlp;
2566         if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) {
2567                 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST);
2568                 return;
2569         }
2570         fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp);
2571         fclose(mlfile);
2572 }
2573
2574 /*
2575  * Free up a group list.
2576  */
2577 void
2578 free_grp(grp)
2579         struct grouplist *grp;
2580 {
2581         if (grp->gr_type == GT_HOST) {
2582                 if (grp->gr_ptr.gt_addrinfo != NULL)
2583                         freeaddrinfo(grp->gr_ptr.gt_addrinfo);
2584         } else if (grp->gr_type == GT_NET) {
2585                 if (grp->gr_ptr.gt_net.nt_name)
2586                         free(grp->gr_ptr.gt_net.nt_name);
2587         }
2588         free((caddr_t)grp);
2589 }
2590
2591 #ifdef DEBUG
2592 void
2593 SYSLOG(int pri, const char *fmt, ...)
2594 {
2595         va_list ap;
2596
2597         va_start(ap, fmt);
2598         vfprintf(stderr, fmt, ap);
2599         va_end(ap);
2600 }
2601 #endif /* DEBUG */
2602
2603 /*
2604  * Check options for consistency.
2605  */
2606 int
2607 check_options(dp)
2608         struct dirlist *dp;
2609 {
2610
2611         if (dp == (struct dirlist *)NULL)
2612             return (1);
2613         if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL)) {
2614             syslog(LOG_ERR, "-mapall and -maproot mutually exclusive");
2615             return (1);
2616         }
2617         if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) {
2618                 syslog(LOG_ERR, "-mask requires -network");
2619                 return (1);
2620         }
2621         if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) {
2622                 syslog(LOG_ERR, "-network requires mask specification");
2623                 return (1);
2624         }
2625         if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) {
2626                 syslog(LOG_ERR, "-mask and /masklen are mutually exclusive");
2627                 return (1);
2628         }
2629         if ((opt_flags & OP_ALLDIRS) && dp->dp_left) {
2630             syslog(LOG_ERR, "-alldirs has multiple directories");
2631             return (1);
2632         }
2633         return (0);
2634 }
2635
2636 /*
2637  * Check an absolute directory path for any symbolic links. Return true
2638  */
2639 int
2640 check_dirpath(dirp)
2641         char *dirp;
2642 {
2643         char *cp;
2644         int ret = 1;
2645         struct stat sb;
2646
2647         cp = dirp + 1;
2648         while (*cp && ret) {
2649                 if (*cp == '/') {
2650                         *cp = '\0';
2651                         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
2652                                 ret = 0;
2653                         *cp = '/';
2654                 }
2655                 cp++;
2656         }
2657         if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode))
2658                 ret = 0;
2659         return (ret);
2660 }
2661
2662 /*
2663  * Make a netmask according to the specified prefix length. The ss_family
2664  * and other non-address fields must be initialised before calling this.
2665  */
2666 int
2667 makemask(struct sockaddr_storage *ssp, int bitlen)
2668 {
2669         u_char *p;
2670         int bits, i, len;
2671
2672         if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL)
2673                 return (-1);
2674         if (bitlen > len * CHAR_BIT)
2675                 return (-1);
2676
2677         for (i = 0; i < len; i++) {
2678                 bits = (bitlen > CHAR_BIT) ? CHAR_BIT : bitlen;
2679                 *p++ = (1 << bits) - 1;
2680                 bitlen -= bits;
2681         }
2682         return 0;
2683 }
2684
2685 /*
2686  * Check that the sockaddr is a valid netmask. Returns 0 if the mask
2687  * is acceptable (i.e. of the form 1...10....0).
2688  */
2689 int
2690 checkmask(struct sockaddr *sa)
2691 {
2692         u_char *mask;
2693         int i, len;
2694
2695         if ((mask = sa_rawaddr(sa, &len)) == NULL)
2696                 return (-1);
2697
2698         for (i = 0; i < len; i++)
2699                 if (mask[i] != 0xff)
2700                         break;
2701         if (i < len) {
2702                 if (~mask[i] & (u_char)(~mask[i] + 1))
2703                         return (-1);
2704                 i++;
2705         }
2706         for (; i < len; i++)
2707                 if (mask[i] != 0)
2708                         return (-1);
2709         return (0);
2710 }
2711
2712 /*
2713  * Compare two sockaddrs according to a specified mask. Return zero if
2714  * `sa1' matches `sa2' when filtered by the netmask in `samask'.
2715  * If samask is NULL, perform a full comparision.
2716  */
2717 int
2718 sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask)
2719 {
2720         unsigned char *p1, *p2, *mask;
2721         int len, i;
2722
2723         if (sa1->sa_family != sa2->sa_family ||
2724             (p1 = sa_rawaddr(sa1, &len)) == NULL ||
2725             (p2 = sa_rawaddr(sa2, NULL)) == NULL)
2726                 return (1);
2727
2728         switch (sa1->sa_family) {
2729         case AF_INET6:
2730                 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
2731                     ((struct sockaddr_in6 *)sa2)->sin6_scope_id)
2732                         return (1);
2733                 break;
2734         }
2735
2736         /* Simple binary comparison if no mask specified. */
2737         if (samask == NULL)
2738                 return (memcmp(p1, p2, len));
2739
2740         /* Set up the mask, and do a mask-based comparison. */
2741         if (sa1->sa_family != samask->sa_family ||
2742             (mask = sa_rawaddr(samask, NULL)) == NULL)
2743                 return (1);
2744
2745         for (i = 0; i < len; i++)
2746                 if ((p1[i] & mask[i]) != (p2[i] & mask[i]))
2747                         return (1);
2748         return (0);
2749 }
2750
2751 /*
2752  * Return a pointer to the part of the sockaddr that contains the
2753  * raw address, and set *nbytes to its length in bytes. Returns
2754  * NULL if the address family is unknown.
2755  */
2756 void *
2757 sa_rawaddr(struct sockaddr *sa, int *nbytes) {
2758         void *p;
2759         int len;
2760
2761         switch (sa->sa_family) {
2762         case AF_INET:
2763                 len = sizeof(((struct sockaddr_in *)sa)->sin_addr);
2764                 p = &((struct sockaddr_in *)sa)->sin_addr;
2765                 break;
2766         case AF_INET6:
2767                 len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr);
2768                 p = &((struct sockaddr_in6 *)sa)->sin6_addr;
2769                 break;
2770         default:
2771                 p = NULL;
2772                 len = 0;
2773         }
2774
2775         if (nbytes != NULL)
2776                 *nbytes = len;
2777         return (p);
2778 }
2779
2780 void
2781 huphandler(int sig)
2782 {
2783         got_sighup = 1;
2784 }
2785
2786 void terminate(sig)
2787 int sig;
2788 {
2789         pidfile_remove(pfh);
2790         rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL);
2791         rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL);
2792         exit (0);
2793 }