1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Herb Hasler and Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #ifndef lint 36 static const char copyright[] = 37 "@(#) Copyright (c) 1989, 1993\n\ 38 The Regents of the University of California. All rights reserved.\n"; 39 #endif /*not lint*/ 40 41 #if 0 42 #ifndef lint 43 static char sccsid[] = "@(#)mountd.c 8.15 (Berkeley) 5/1/95"; 44 #endif /*not lint*/ 45 #endif 46 47 #include <sys/cdefs.h> 48 __FBSDID("$FreeBSD$"); 49 50 #include <sys/param.h> 51 #include <sys/fcntl.h> 52 #include <sys/fnv_hash.h> 53 #include <sys/linker.h> 54 #include <sys/module.h> 55 #include <sys/mount.h> 56 #include <sys/queue.h> 57 #include <sys/stat.h> 58 #include <sys/sysctl.h> 59 #include <sys/syslog.h> 60 61 #include <rpc/rpc.h> 62 #include <rpc/rpc_com.h> 63 #include <rpc/pmap_clnt.h> 64 #include <rpc/pmap_prot.h> 65 #include <rpcsvc/mount.h> 66 #include <nfs/nfsproto.h> 67 #include <nfs/nfssvc.h> 68 #include <nfsserver/nfs.h> 69 70 #include <fs/nfs/nfsport.h> 71 72 #include <arpa/inet.h> 73 74 #include <ctype.h> 75 #include <err.h> 76 #include <errno.h> 77 #include <grp.h> 78 #include <libutil.h> 79 #include <limits.h> 80 #include <netdb.h> 81 #include <pwd.h> 82 #include <signal.h> 83 #include <stdio.h> 84 #include <stdlib.h> 85 #include <string.h> 86 #include <unistd.h> 87 #include "pathnames.h" 88 #include "mntopts.h" 89 90 #ifdef DEBUG 91 #include <stdarg.h> 92 #endif 93 94 /* 95 * Structures for keeping the mount list and export list 96 */ 97 struct mountlist { 98 char ml_host[MNTNAMLEN+1]; 99 char ml_dirp[MNTPATHLEN+1]; 100 101 SLIST_ENTRY(mountlist) next; 102 }; 103 104 struct dirlist { 105 struct dirlist *dp_left; 106 struct dirlist *dp_right; 107 int dp_flag; 108 struct hostlist *dp_hosts; /* List of hosts this dir exported to */ 109 char *dp_dirp; 110 }; 111 /* dp_flag bits */ 112 #define DP_DEFSET 0x1 113 #define DP_HOSTSET 0x2 114 115 struct exportlist { 116 struct dirlist *ex_dirl; 117 struct dirlist *ex_defdir; 118 struct grouplist *ex_grphead; 119 int ex_flag; 120 fsid_t ex_fs; 121 char *ex_fsdir; 122 char *ex_indexfile; 123 struct xucred ex_defanon; 124 int ex_defexflags; 125 int ex_numsecflavors; 126 int ex_secflavors[MAXSECFLAVORS]; 127 int ex_defnumsecflavors; 128 int ex_defsecflavors[MAXSECFLAVORS]; 129 130 SLIST_ENTRY(exportlist) entries; 131 }; 132 /* ex_flag bits */ 133 #define EX_LINKED 0x1 134 #define EX_DONE 0x2 135 #define EX_DEFSET 0x4 136 #define EX_PUBLICFH 0x8 137 138 SLIST_HEAD(exportlisthead, exportlist); 139 140 struct netmsk { 141 struct sockaddr_storage nt_net; 142 struct sockaddr_storage nt_mask; 143 char *nt_name; 144 }; 145 146 union grouptypes { 147 struct addrinfo *gt_addrinfo; 148 struct netmsk gt_net; 149 }; 150 151 struct grouplist { 152 int gr_type; 153 union grouptypes gr_ptr; 154 struct grouplist *gr_next; 155 struct xucred gr_anon; 156 int gr_exflags; 157 int gr_flag; 158 int gr_numsecflavors; 159 int gr_secflavors[MAXSECFLAVORS]; 160 }; 161 /* Group types */ 162 #define GT_NULL 0x0 163 #define GT_HOST 0x1 164 #define GT_NET 0x2 165 #define GT_DEFAULT 0x3 166 #define GT_IGNORE 0x5 167 168 /* Group flags */ 169 #define GR_FND 0x1 170 171 struct hostlist { 172 int ht_flag; /* Uses DP_xx bits */ 173 struct grouplist *ht_grp; 174 struct hostlist *ht_next; 175 }; 176 177 struct fhreturn { 178 int fhr_flag; 179 int fhr_vers; 180 nfsfh_t fhr_fh; 181 int fhr_numsecflavors; 182 int *fhr_secflavors; 183 }; 184 185 #define GETPORT_MAXTRY 20 /* Max tries to get a port # */ 186 187 /* Global defs */ 188 static char *add_expdir(struct dirlist **, char *, int); 189 static void add_dlist(struct dirlist **, struct dirlist *, 190 struct grouplist *, int, struct exportlist *, 191 struct xucred *, int); 192 static void add_mlist(char *, char *); 193 static int check_dirpath(char *); 194 static int check_options(struct dirlist *); 195 static int checkmask(struct sockaddr *sa); 196 static int chk_host(struct dirlist *, struct sockaddr *, int *, int *, 197 int *, int **); 198 static char *strsep_quote(char **stringp, const char *delim); 199 static int create_service(struct netconfig *nconf); 200 static void complete_service(struct netconfig *nconf, char *port_str); 201 static void clearout_service(void); 202 static void del_mlist(char *hostp, char *dirp); 203 static struct dirlist *dirp_search(struct dirlist *, char *); 204 static int do_export_mount(struct exportlist *, struct statfs *); 205 static int do_mount(struct exportlist *, struct grouplist *, int, 206 struct xucred *, char *, int, struct statfs *, int, int *); 207 static int do_opt(char **, char **, struct exportlist *, 208 struct grouplist *, int *, int *, struct xucred *); 209 static struct exportlist *ex_search(fsid_t *, struct exportlisthead *); 210 static struct exportlist *get_exp(void); 211 static void free_dir(struct dirlist *); 212 static void free_exp(struct exportlist *); 213 static void free_grp(struct grouplist *); 214 static void free_host(struct hostlist *); 215 static void free_v4rootexp(void); 216 static void get_exportlist_one(int); 217 static void get_exportlist(int); 218 static void insert_exports(struct exportlist *, struct exportlisthead *); 219 static void free_exports(struct exportlisthead *); 220 static void read_exportfile(int); 221 static int compare_nmount_exportlist(struct iovec *, int, char *); 222 static int compare_export(struct exportlist *, struct exportlist *); 223 static int compare_cred(struct xucred *, struct xucred *); 224 static int compare_secflavor(int *, int *, int); 225 static void delete_export(struct iovec *, int, struct statfs *, char *); 226 static int get_host(char *, struct grouplist *, struct grouplist *); 227 static struct hostlist *get_ht(void); 228 static int get_line(void); 229 static void get_mountlist(void); 230 static int get_net(char *, struct netmsk *, int); 231 static void getexp_err(struct exportlist *, struct grouplist *, const char *); 232 static struct grouplist *get_grp(void); 233 static void hang_dirp(struct dirlist *, struct grouplist *, 234 struct exportlist *, int, struct xucred *, int); 235 static void huphandler(int sig); 236 static int makemask(struct sockaddr_storage *ssp, int bitlen); 237 static void mntsrv(struct svc_req *, SVCXPRT *); 238 static void nextfield(char **, char **); 239 static void out_of_mem(void); 240 static void parsecred(char *, struct xucred *); 241 static int parsesec(char *, struct exportlist *); 242 static int put_exlist(struct dirlist *, XDR *, struct dirlist *, 243 int *, int); 244 static void *sa_rawaddr(struct sockaddr *sa, int *nbytes); 245 static int sacmp(struct sockaddr *sa1, struct sockaddr *sa2, 246 struct sockaddr *samask); 247 static int scan_tree(struct dirlist *, struct sockaddr *); 248 static void usage(void); 249 static int xdr_dir(XDR *, char *); 250 static int xdr_explist(XDR *, caddr_t); 251 static int xdr_explist_brief(XDR *, caddr_t); 252 static int xdr_explist_common(XDR *, caddr_t, int); 253 static int xdr_fhs(XDR *, caddr_t); 254 static int xdr_mlist(XDR *, caddr_t); 255 static void terminate(int); 256 257 #define EXPHASH(f) (fnv_32_buf((f), sizeof(fsid_t), 0) % exphashsize) 258 static struct exportlisthead *exphead = NULL; 259 static struct exportlisthead *oldexphead = NULL; 260 static int exphashsize = 0; 261 static SLIST_HEAD(, mountlist) mlhead = SLIST_HEAD_INITIALIZER(&mlhead); 262 static char *exnames_default[2] = { _PATH_EXPORTS, NULL }; 263 static char **exnames; 264 static char **hosts = NULL; 265 static struct xucred def_anon = { 266 XUCRED_VERSION, 267 (uid_t)65534, 268 1, 269 { (gid_t)65533 }, 270 { NULL } 271 }; 272 static int force_v2 = 0; 273 static int resvport_only = 1; 274 static int nhosts = 0; 275 static int dir_only = 1; 276 static int dolog = 0; 277 static int got_sighup = 0; 278 static int xcreated = 0; 279 280 static char *svcport_str = NULL; 281 static int mallocd_svcport = 0; 282 static int *sock_fd; 283 static int sock_fdcnt; 284 static int sock_fdpos; 285 static int suspend_nfsd = 0; 286 287 static int opt_flags; 288 static int have_v6 = 1; 289 290 static int v4root_phase = 0; 291 static char v4root_dirpath[PATH_MAX + 1]; 292 static struct exportlist *v4root_ep = NULL; 293 static int has_publicfh = 0; 294 static int has_set_publicfh = 0; 295 296 static struct pidfh *pfh = NULL; 297 /* Bits for opt_flags above */ 298 #define OP_MAPROOT 0x01 299 #define OP_MAPALL 0x02 300 /* 0x4 free */ 301 #define OP_MASK 0x08 302 #define OP_NET 0x10 303 #define OP_ALLDIRS 0x40 304 #define OP_HAVEMASK 0x80 /* A mask was specified or inferred. */ 305 #define OP_QUIET 0x100 306 #define OP_MASKLEN 0x200 307 #define OP_SEC 0x400 308 309 #ifdef DEBUG 310 static int debug = 1; 311 static void SYSLOG(int, const char *, ...) __printflike(2, 3); 312 #define syslog SYSLOG 313 #else 314 static int debug = 0; 315 #endif 316 317 /* 318 * The LOGDEBUG() syslog() calls are always compiled into the daemon. 319 * To enable them, create a file at _PATH_MOUNTDDEBUG. This file can be empty. 320 * To disable the logging, just delete the file at _PATH_MOUNTDDEBUG. 321 */ 322 static int logdebug = 0; 323 #define LOGDEBUG(format, ...) \ 324 (logdebug ? syslog(LOG_DEBUG, format, ## __VA_ARGS__) : 0) 325 326 /* 327 * Similar to strsep(), but it allows for quoted strings 328 * and escaped characters. 329 * 330 * It returns the string (or NULL, if *stringp is NULL), 331 * which is a de-quoted version of the string if necessary. 332 * 333 * It modifies *stringp in place. 334 */ 335 static char * 336 strsep_quote(char **stringp, const char *delim) 337 { 338 char *srcptr, *dstptr, *retval; 339 char quot = 0; 340 341 if (stringp == NULL || *stringp == NULL) 342 return (NULL); 343 344 srcptr = dstptr = retval = *stringp; 345 346 while (*srcptr) { 347 /* 348 * We're looking for several edge cases here. 349 * First: if we're in quote state (quot != 0), 350 * then we ignore the delim characters, but otherwise 351 * process as normal, unless it is the quote character. 352 * Second: if the current character is a backslash, 353 * we take the next character as-is, without checking 354 * for delim, quote, or backslash. Exception: if the 355 * next character is a NUL, that's the end of the string. 356 * Third: if the character is a quote character, we toggle 357 * quote state. 358 * Otherwise: check the current character for NUL, or 359 * being in delim, and end the string if either is true. 360 */ 361 if (*srcptr == '\\') { 362 srcptr++; 363 /* 364 * The edge case here is if the next character 365 * is NUL, we want to stop processing. But if 366 * it's not NUL, then we simply want to copy it. 367 */ 368 if (*srcptr) { 369 *dstptr++ = *srcptr++; 370 } 371 continue; 372 } 373 if (quot == 0 && (*srcptr == '\'' || *srcptr == '"')) { 374 quot = *srcptr++; 375 continue; 376 } 377 if (quot && *srcptr == quot) { 378 /* End of the quoted part */ 379 quot = 0; 380 srcptr++; 381 continue; 382 } 383 if (!quot && strchr(delim, *srcptr)) 384 break; 385 *dstptr++ = *srcptr++; 386 } 387 388 *stringp = (*srcptr == '\0') ? NULL : srcptr + 1; 389 *dstptr = 0; /* Terminate the string */ 390 return (retval); 391 } 392 393 /* 394 * Mountd server for NFS mount protocol as described in: 395 * NFS: Network File System Protocol Specification, RFC1094, Appendix A 396 * The optional arguments are the exports file name 397 * default: _PATH_EXPORTS 398 * and "-n" to allow nonroot mount. 399 */ 400 int 401 main(int argc, char **argv) 402 { 403 fd_set readfds; 404 struct netconfig *nconf; 405 char *endptr, **hosts_bak; 406 void *nc_handle; 407 pid_t otherpid; 408 in_port_t svcport; 409 int c, k, s; 410 int maxrec = RPC_MAXDATASIZE; 411 int attempt_cnt, port_len, port_pos, ret; 412 char **port_list; 413 414 /* Check that another mountd isn't already running. */ 415 pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &otherpid); 416 if (pfh == NULL) { 417 if (errno == EEXIST) 418 errx(1, "mountd already running, pid: %d.", otherpid); 419 warn("cannot open or create pidfile"); 420 } 421 422 s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP); 423 if (s < 0) 424 have_v6 = 0; 425 else 426 close(s); 427 428 while ((c = getopt(argc, argv, "2deh:lnp:rS")) != -1) 429 switch (c) { 430 case '2': 431 force_v2 = 1; 432 break; 433 case 'e': 434 /* now a no-op, since this is the default */ 435 break; 436 case 'n': 437 resvport_only = 0; 438 break; 439 case 'r': 440 dir_only = 0; 441 break; 442 case 'd': 443 debug = debug ? 0 : 1; 444 break; 445 case 'l': 446 dolog = 1; 447 break; 448 case 'p': 449 endptr = NULL; 450 svcport = (in_port_t)strtoul(optarg, &endptr, 10); 451 if (endptr == NULL || *endptr != '\0' || 452 svcport == 0 || svcport >= IPPORT_MAX) 453 usage(); 454 svcport_str = strdup(optarg); 455 break; 456 case 'h': 457 ++nhosts; 458 hosts_bak = hosts; 459 hosts_bak = realloc(hosts, nhosts * sizeof(char *)); 460 if (hosts_bak == NULL) { 461 if (hosts != NULL) { 462 for (k = 0; k < nhosts; k++) 463 free(hosts[k]); 464 free(hosts); 465 out_of_mem(); 466 } 467 } 468 hosts = hosts_bak; 469 hosts[nhosts - 1] = strdup(optarg); 470 if (hosts[nhosts - 1] == NULL) { 471 for (k = 0; k < (nhosts - 1); k++) 472 free(hosts[k]); 473 free(hosts); 474 out_of_mem(); 475 } 476 break; 477 case 'S': 478 suspend_nfsd = 1; 479 break; 480 default: 481 usage(); 482 } 483 484 if (modfind("nfsd") < 0) { 485 /* Not present in kernel, try loading it */ 486 if (kldload("nfsd") < 0 || modfind("nfsd") < 0) 487 errx(1, "NFS server is not available"); 488 } 489 490 argc -= optind; 491 argv += optind; 492 if (argc > 0) 493 exnames = argv; 494 else 495 exnames = exnames_default; 496 openlog("mountd", LOG_PID, LOG_DAEMON); 497 if (debug) 498 warnx("getting export list"); 499 get_exportlist(0); 500 if (debug) 501 warnx("getting mount list"); 502 get_mountlist(); 503 if (debug) 504 warnx("here we go"); 505 if (debug == 0) { 506 daemon(0, 0); 507 signal(SIGINT, SIG_IGN); 508 signal(SIGQUIT, SIG_IGN); 509 } 510 signal(SIGHUP, huphandler); 511 signal(SIGTERM, terminate); 512 signal(SIGPIPE, SIG_IGN); 513 514 pidfile_write(pfh); 515 516 rpcb_unset(MOUNTPROG, MOUNTVERS, NULL); 517 rpcb_unset(MOUNTPROG, MOUNTVERS3, NULL); 518 rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec); 519 520 if (!resvport_only) { 521 if (sysctlbyname("vfs.nfsd.nfs_privport", NULL, NULL, 522 &resvport_only, sizeof(resvport_only)) != 0 && 523 errno != ENOENT) { 524 syslog(LOG_ERR, "sysctl: %m"); 525 exit(1); 526 } 527 } 528 529 /* 530 * If no hosts were specified, add a wildcard entry to bind to 531 * INADDR_ANY. Otherwise make sure 127.0.0.1 and ::1 are added to the 532 * list. 533 */ 534 if (nhosts == 0) { 535 hosts = malloc(sizeof(char *)); 536 if (hosts == NULL) 537 out_of_mem(); 538 hosts[0] = "*"; 539 nhosts = 1; 540 } else { 541 hosts_bak = hosts; 542 if (have_v6) { 543 hosts_bak = realloc(hosts, (nhosts + 2) * 544 sizeof(char *)); 545 if (hosts_bak == NULL) { 546 for (k = 0; k < nhosts; k++) 547 free(hosts[k]); 548 free(hosts); 549 out_of_mem(); 550 } else 551 hosts = hosts_bak; 552 nhosts += 2; 553 hosts[nhosts - 2] = "::1"; 554 } else { 555 hosts_bak = realloc(hosts, (nhosts + 1) * sizeof(char *)); 556 if (hosts_bak == NULL) { 557 for (k = 0; k < nhosts; k++) 558 free(hosts[k]); 559 free(hosts); 560 out_of_mem(); 561 } else { 562 nhosts += 1; 563 hosts = hosts_bak; 564 } 565 } 566 567 hosts[nhosts - 1] = "127.0.0.1"; 568 } 569 570 attempt_cnt = 1; 571 sock_fdcnt = 0; 572 sock_fd = NULL; 573 port_list = NULL; 574 port_len = 0; 575 nc_handle = setnetconfig(); 576 while ((nconf = getnetconfig(nc_handle))) { 577 if (nconf->nc_flag & NC_VISIBLE) { 578 if (have_v6 == 0 && strcmp(nconf->nc_protofmly, 579 "inet6") == 0) { 580 /* DO NOTHING */ 581 } else { 582 ret = create_service(nconf); 583 if (ret == 1) 584 /* Ignore this call */ 585 continue; 586 if (ret < 0) { 587 /* 588 * Failed to bind port, so close off 589 * all sockets created and try again 590 * if the port# was dynamically 591 * assigned via bind(2). 592 */ 593 clearout_service(); 594 if (mallocd_svcport != 0 && 595 attempt_cnt < GETPORT_MAXTRY) { 596 free(svcport_str); 597 svcport_str = NULL; 598 mallocd_svcport = 0; 599 } else { 600 errno = EADDRINUSE; 601 syslog(LOG_ERR, 602 "bindresvport_sa: %m"); 603 exit(1); 604 } 605 606 /* Start over at the first service. */ 607 free(sock_fd); 608 sock_fdcnt = 0; 609 sock_fd = NULL; 610 nc_handle = setnetconfig(); 611 attempt_cnt++; 612 } else if (mallocd_svcport != 0 && 613 attempt_cnt == GETPORT_MAXTRY) { 614 /* 615 * For the last attempt, allow 616 * different port #s for each nconf 617 * by saving the svcport_str and 618 * setting it back to NULL. 619 */ 620 port_list = realloc(port_list, 621 (port_len + 1) * sizeof(char *)); 622 if (port_list == NULL) 623 out_of_mem(); 624 port_list[port_len++] = svcport_str; 625 svcport_str = NULL; 626 mallocd_svcport = 0; 627 } 628 } 629 } 630 } 631 632 /* 633 * Successfully bound the ports, so call complete_service() to 634 * do the rest of the setup on the service(s). 635 */ 636 sock_fdpos = 0; 637 port_pos = 0; 638 nc_handle = setnetconfig(); 639 while ((nconf = getnetconfig(nc_handle))) { 640 if (nconf->nc_flag & NC_VISIBLE) { 641 if (have_v6 == 0 && strcmp(nconf->nc_protofmly, 642 "inet6") == 0) { 643 /* DO NOTHING */ 644 } else if (port_list != NULL) { 645 if (port_pos >= port_len) { 646 syslog(LOG_ERR, "too many port#s"); 647 exit(1); 648 } 649 complete_service(nconf, port_list[port_pos++]); 650 } else 651 complete_service(nconf, svcport_str); 652 } 653 } 654 endnetconfig(nc_handle); 655 free(sock_fd); 656 if (port_list != NULL) { 657 for (port_pos = 0; port_pos < port_len; port_pos++) 658 free(port_list[port_pos]); 659 free(port_list); 660 } 661 662 if (xcreated == 0) { 663 syslog(LOG_ERR, "could not create any services"); 664 exit(1); 665 } 666 667 /* Expand svc_run() here so that we can call get_exportlist(). */ 668 for (;;) { 669 if (got_sighup) { 670 get_exportlist(1); 671 got_sighup = 0; 672 } 673 readfds = svc_fdset; 674 switch (select(svc_maxfd + 1, &readfds, NULL, NULL, NULL)) { 675 case -1: 676 if (errno == EINTR) 677 continue; 678 syslog(LOG_ERR, "mountd died: select: %m"); 679 exit(1); 680 case 0: 681 continue; 682 default: 683 svc_getreqset(&readfds); 684 } 685 } 686 } 687 688 /* 689 * This routine creates and binds sockets on the appropriate 690 * addresses. It gets called one time for each transport. 691 * It returns 0 upon success, 1 for ingore the call and -1 to indicate 692 * bind failed with EADDRINUSE. 693 * Any file descriptors that have been created are stored in sock_fd and 694 * the total count of them is maintained in sock_fdcnt. 695 */ 696 static int 697 create_service(struct netconfig *nconf) 698 { 699 struct addrinfo hints, *res = NULL; 700 struct sockaddr_in *sin; 701 struct sockaddr_in6 *sin6; 702 struct __rpc_sockinfo si; 703 int aicode; 704 int fd; 705 int nhostsbak; 706 int one = 1; 707 int r; 708 u_int32_t host_addr[4]; /* IPv4 or IPv6 */ 709 int mallocd_res; 710 711 if ((nconf->nc_semantics != NC_TPI_CLTS) && 712 (nconf->nc_semantics != NC_TPI_COTS) && 713 (nconf->nc_semantics != NC_TPI_COTS_ORD)) 714 return (1); /* not my type */ 715 716 /* 717 * XXX - using RPC library internal functions. 718 */ 719 if (!__rpc_nconf2sockinfo(nconf, &si)) { 720 syslog(LOG_ERR, "cannot get information for %s", 721 nconf->nc_netid); 722 return (1); 723 } 724 725 /* Get mountd's address on this transport */ 726 memset(&hints, 0, sizeof hints); 727 hints.ai_family = si.si_af; 728 hints.ai_socktype = si.si_socktype; 729 hints.ai_protocol = si.si_proto; 730 731 /* 732 * Bind to specific IPs if asked to 733 */ 734 nhostsbak = nhosts; 735 while (nhostsbak > 0) { 736 --nhostsbak; 737 sock_fd = realloc(sock_fd, (sock_fdcnt + 1) * sizeof(int)); 738 if (sock_fd == NULL) 739 out_of_mem(); 740 sock_fd[sock_fdcnt++] = -1; /* Set invalid for now. */ 741 mallocd_res = 0; 742 743 hints.ai_flags = AI_PASSIVE; 744 745 /* 746 * XXX - using RPC library internal functions. 747 */ 748 if ((fd = __rpc_nconf2fd(nconf)) < 0) { 749 int non_fatal = 0; 750 if (errno == EAFNOSUPPORT && 751 nconf->nc_semantics != NC_TPI_CLTS) 752 non_fatal = 1; 753 754 syslog(non_fatal ? LOG_DEBUG : LOG_ERR, 755 "cannot create socket for %s", nconf->nc_netid); 756 if (non_fatal != 0) 757 continue; 758 exit(1); 759 } 760 761 switch (hints.ai_family) { 762 case AF_INET: 763 if (inet_pton(AF_INET, hosts[nhostsbak], 764 host_addr) == 1) { 765 hints.ai_flags |= AI_NUMERICHOST; 766 } else { 767 /* 768 * Skip if we have an AF_INET6 address. 769 */ 770 if (inet_pton(AF_INET6, hosts[nhostsbak], 771 host_addr) == 1) { 772 close(fd); 773 continue; 774 } 775 } 776 break; 777 case AF_INET6: 778 if (inet_pton(AF_INET6, hosts[nhostsbak], 779 host_addr) == 1) { 780 hints.ai_flags |= AI_NUMERICHOST; 781 } else { 782 /* 783 * Skip if we have an AF_INET address. 784 */ 785 if (inet_pton(AF_INET, hosts[nhostsbak], 786 host_addr) == 1) { 787 close(fd); 788 continue; 789 } 790 } 791 792 /* 793 * We're doing host-based access checks here, so don't 794 * allow v4-in-v6 to confuse things. The kernel will 795 * disable it by default on NFS sockets too. 796 */ 797 if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, 798 sizeof one) < 0) { 799 syslog(LOG_ERR, 800 "can't disable v4-in-v6 on IPv6 socket"); 801 exit(1); 802 } 803 break; 804 default: 805 break; 806 } 807 808 /* 809 * If no hosts were specified, just bind to INADDR_ANY 810 */ 811 if (strcmp("*", hosts[nhostsbak]) == 0) { 812 if (svcport_str == NULL) { 813 res = malloc(sizeof(struct addrinfo)); 814 if (res == NULL) 815 out_of_mem(); 816 mallocd_res = 1; 817 res->ai_flags = hints.ai_flags; 818 res->ai_family = hints.ai_family; 819 res->ai_protocol = hints.ai_protocol; 820 switch (res->ai_family) { 821 case AF_INET: 822 sin = malloc(sizeof(struct sockaddr_in)); 823 if (sin == NULL) 824 out_of_mem(); 825 sin->sin_family = AF_INET; 826 sin->sin_port = htons(0); 827 sin->sin_addr.s_addr = htonl(INADDR_ANY); 828 res->ai_addr = (struct sockaddr*) sin; 829 res->ai_addrlen = (socklen_t) 830 sizeof(struct sockaddr_in); 831 break; 832 case AF_INET6: 833 sin6 = malloc(sizeof(struct sockaddr_in6)); 834 if (sin6 == NULL) 835 out_of_mem(); 836 sin6->sin6_family = AF_INET6; 837 sin6->sin6_port = htons(0); 838 sin6->sin6_addr = in6addr_any; 839 res->ai_addr = (struct sockaddr*) sin6; 840 res->ai_addrlen = (socklen_t) 841 sizeof(struct sockaddr_in6); 842 break; 843 default: 844 syslog(LOG_ERR, "bad addr fam %d", 845 res->ai_family); 846 exit(1); 847 } 848 } else { 849 if ((aicode = getaddrinfo(NULL, svcport_str, 850 &hints, &res)) != 0) { 851 syslog(LOG_ERR, 852 "cannot get local address for %s: %s", 853 nconf->nc_netid, 854 gai_strerror(aicode)); 855 close(fd); 856 continue; 857 } 858 } 859 } else { 860 if ((aicode = getaddrinfo(hosts[nhostsbak], svcport_str, 861 &hints, &res)) != 0) { 862 syslog(LOG_ERR, 863 "cannot get local address for %s: %s", 864 nconf->nc_netid, gai_strerror(aicode)); 865 close(fd); 866 continue; 867 } 868 } 869 870 /* Store the fd. */ 871 sock_fd[sock_fdcnt - 1] = fd; 872 873 /* Now, attempt the bind. */ 874 r = bindresvport_sa(fd, res->ai_addr); 875 if (r != 0) { 876 if (errno == EADDRINUSE && mallocd_svcport != 0) { 877 if (mallocd_res != 0) { 878 free(res->ai_addr); 879 free(res); 880 } else 881 freeaddrinfo(res); 882 return (-1); 883 } 884 syslog(LOG_ERR, "bindresvport_sa: %m"); 885 exit(1); 886 } 887 888 if (svcport_str == NULL) { 889 svcport_str = malloc(NI_MAXSERV * sizeof(char)); 890 if (svcport_str == NULL) 891 out_of_mem(); 892 mallocd_svcport = 1; 893 894 if (getnameinfo(res->ai_addr, 895 res->ai_addr->sa_len, NULL, NI_MAXHOST, 896 svcport_str, NI_MAXSERV * sizeof(char), 897 NI_NUMERICHOST | NI_NUMERICSERV)) 898 errx(1, "Cannot get port number"); 899 } 900 if (mallocd_res != 0) { 901 free(res->ai_addr); 902 free(res); 903 } else 904 freeaddrinfo(res); 905 res = NULL; 906 } 907 return (0); 908 } 909 910 /* 911 * Called after all the create_service() calls have succeeded, to complete 912 * the setup and registration. 913 */ 914 static void 915 complete_service(struct netconfig *nconf, char *port_str) 916 { 917 struct addrinfo hints, *res = NULL; 918 struct __rpc_sockinfo si; 919 struct netbuf servaddr; 920 SVCXPRT *transp = NULL; 921 int aicode, fd, nhostsbak; 922 int registered = 0; 923 924 if ((nconf->nc_semantics != NC_TPI_CLTS) && 925 (nconf->nc_semantics != NC_TPI_COTS) && 926 (nconf->nc_semantics != NC_TPI_COTS_ORD)) 927 return; /* not my type */ 928 929 /* 930 * XXX - using RPC library internal functions. 931 */ 932 if (!__rpc_nconf2sockinfo(nconf, &si)) { 933 syslog(LOG_ERR, "cannot get information for %s", 934 nconf->nc_netid); 935 return; 936 } 937 938 nhostsbak = nhosts; 939 while (nhostsbak > 0) { 940 --nhostsbak; 941 if (sock_fdpos >= sock_fdcnt) { 942 /* Should never happen. */ 943 syslog(LOG_ERR, "Ran out of socket fd's"); 944 return; 945 } 946 fd = sock_fd[sock_fdpos++]; 947 if (fd < 0) 948 continue; 949 950 /* 951 * Using -1 tells listen(2) to use 952 * kern.ipc.soacceptqueue for the backlog. 953 */ 954 if (nconf->nc_semantics != NC_TPI_CLTS) 955 listen(fd, -1); 956 957 if (nconf->nc_semantics == NC_TPI_CLTS ) 958 transp = svc_dg_create(fd, 0, 0); 959 else 960 transp = svc_vc_create(fd, RPC_MAXDATASIZE, 961 RPC_MAXDATASIZE); 962 963 if (transp != (SVCXPRT *) NULL) { 964 if (!svc_reg(transp, MOUNTPROG, MOUNTVERS, mntsrv, 965 NULL)) 966 syslog(LOG_ERR, 967 "can't register %s MOUNTVERS service", 968 nconf->nc_netid); 969 if (!force_v2) { 970 if (!svc_reg(transp, MOUNTPROG, MOUNTVERS3, 971 mntsrv, NULL)) 972 syslog(LOG_ERR, 973 "can't register %s MOUNTVERS3 service", 974 nconf->nc_netid); 975 } 976 } else 977 syslog(LOG_WARNING, "can't create %s services", 978 nconf->nc_netid); 979 980 if (registered == 0) { 981 registered = 1; 982 memset(&hints, 0, sizeof hints); 983 hints.ai_flags = AI_PASSIVE; 984 hints.ai_family = si.si_af; 985 hints.ai_socktype = si.si_socktype; 986 hints.ai_protocol = si.si_proto; 987 988 if ((aicode = getaddrinfo(NULL, port_str, &hints, 989 &res)) != 0) { 990 syslog(LOG_ERR, "cannot get local address: %s", 991 gai_strerror(aicode)); 992 exit(1); 993 } 994 995 servaddr.buf = malloc(res->ai_addrlen); 996 memcpy(servaddr.buf, res->ai_addr, res->ai_addrlen); 997 servaddr.len = res->ai_addrlen; 998 999 rpcb_set(MOUNTPROG, MOUNTVERS, nconf, &servaddr); 1000 rpcb_set(MOUNTPROG, MOUNTVERS3, nconf, &servaddr); 1001 1002 xcreated++; 1003 freeaddrinfo(res); 1004 } 1005 } /* end while */ 1006 } 1007 1008 /* 1009 * Clear out sockets after a failure to bind one of them, so that the 1010 * cycle of socket creation/binding can start anew. 1011 */ 1012 static void 1013 clearout_service(void) 1014 { 1015 int i; 1016 1017 for (i = 0; i < sock_fdcnt; i++) { 1018 if (sock_fd[i] >= 0) { 1019 shutdown(sock_fd[i], SHUT_RDWR); 1020 close(sock_fd[i]); 1021 } 1022 } 1023 } 1024 1025 static void 1026 usage(void) 1027 { 1028 fprintf(stderr, 1029 "usage: mountd [-2] [-d] [-e] [-l] [-n] [-p <port>] [-r] " 1030 "[-S] [-h <bindip>] [export_file ...]\n"); 1031 exit(1); 1032 } 1033 1034 /* 1035 * The mount rpc service 1036 */ 1037 void 1038 mntsrv(struct svc_req *rqstp, SVCXPRT *transp) 1039 { 1040 struct exportlist *ep; 1041 struct dirlist *dp; 1042 struct fhreturn fhr; 1043 struct stat stb; 1044 struct statfs fsb; 1045 char host[NI_MAXHOST], numerichost[NI_MAXHOST]; 1046 int lookup_failed = 1; 1047 struct sockaddr *saddr; 1048 u_short sport; 1049 char rpcpath[MNTPATHLEN + 1], dirpath[MAXPATHLEN]; 1050 int bad = 0, defset, hostset; 1051 sigset_t sighup_mask; 1052 int numsecflavors, *secflavorsp; 1053 1054 sigemptyset(&sighup_mask); 1055 sigaddset(&sighup_mask, SIGHUP); 1056 saddr = svc_getrpccaller(transp)->buf; 1057 switch (saddr->sa_family) { 1058 case AF_INET6: 1059 sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port); 1060 break; 1061 case AF_INET: 1062 sport = ntohs(((struct sockaddr_in *)saddr)->sin_port); 1063 break; 1064 default: 1065 syslog(LOG_ERR, "request from unknown address family"); 1066 return; 1067 } 1068 switch (rqstp->rq_proc) { 1069 case MOUNTPROC_MNT: 1070 case MOUNTPROC_UMNT: 1071 case MOUNTPROC_UMNTALL: 1072 lookup_failed = getnameinfo(saddr, saddr->sa_len, host, 1073 sizeof host, NULL, 0, 0); 1074 } 1075 getnameinfo(saddr, saddr->sa_len, numerichost, 1076 sizeof numerichost, NULL, 0, NI_NUMERICHOST); 1077 switch (rqstp->rq_proc) { 1078 case NULLPROC: 1079 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL)) 1080 syslog(LOG_ERR, "can't send reply"); 1081 return; 1082 case MOUNTPROC_MNT: 1083 if (sport >= IPPORT_RESERVED && resvport_only) { 1084 syslog(LOG_NOTICE, 1085 "mount request from %s from unprivileged port", 1086 numerichost); 1087 svcerr_weakauth(transp); 1088 return; 1089 } 1090 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) { 1091 syslog(LOG_NOTICE, "undecodable mount request from %s", 1092 numerichost); 1093 svcerr_decode(transp); 1094 return; 1095 } 1096 1097 /* 1098 * Get the real pathname and make sure it is a directory 1099 * or a regular file if the -r option was specified 1100 * and it exists. 1101 */ 1102 if (realpath(rpcpath, dirpath) == NULL || 1103 stat(dirpath, &stb) < 0 || 1104 statfs(dirpath, &fsb) < 0) { 1105 chdir("/"); /* Just in case realpath doesn't */ 1106 syslog(LOG_NOTICE, 1107 "mount request from %s for non existent path %s", 1108 numerichost, dirpath); 1109 if (debug) 1110 warnx("stat failed on %s", dirpath); 1111 bad = ENOENT; /* We will send error reply later */ 1112 } 1113 if (!bad && 1114 !S_ISDIR(stb.st_mode) && 1115 (dir_only || !S_ISREG(stb.st_mode))) { 1116 syslog(LOG_NOTICE, 1117 "mount request from %s for non-directory path %s", 1118 numerichost, dirpath); 1119 if (debug) 1120 warnx("mounting non-directory %s", dirpath); 1121 bad = ENOTDIR; /* We will send error reply later */ 1122 } 1123 1124 /* Check in the exports list */ 1125 sigprocmask(SIG_BLOCK, &sighup_mask, NULL); 1126 if (bad) 1127 ep = NULL; 1128 else 1129 ep = ex_search(&fsb.f_fsid, exphead); 1130 hostset = defset = 0; 1131 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset, 1132 &numsecflavors, &secflavorsp) || 1133 ((dp = dirp_search(ep->ex_dirl, dirpath)) && 1134 chk_host(dp, saddr, &defset, &hostset, &numsecflavors, 1135 &secflavorsp)) || 1136 (defset && scan_tree(ep->ex_defdir, saddr) == 0 && 1137 scan_tree(ep->ex_dirl, saddr) == 0))) { 1138 if (bad) { 1139 if (!svc_sendreply(transp, (xdrproc_t)xdr_long, 1140 (caddr_t)&bad)) 1141 syslog(LOG_ERR, "can't send reply"); 1142 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 1143 return; 1144 } 1145 if (hostset & DP_HOSTSET) { 1146 fhr.fhr_flag = hostset; 1147 fhr.fhr_numsecflavors = numsecflavors; 1148 fhr.fhr_secflavors = secflavorsp; 1149 } else { 1150 fhr.fhr_flag = defset; 1151 fhr.fhr_numsecflavors = ep->ex_defnumsecflavors; 1152 fhr.fhr_secflavors = ep->ex_defsecflavors; 1153 } 1154 fhr.fhr_vers = rqstp->rq_vers; 1155 /* Get the file handle */ 1156 memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t)); 1157 if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) { 1158 bad = errno; 1159 syslog(LOG_ERR, "can't get fh for %s", dirpath); 1160 if (!svc_sendreply(transp, (xdrproc_t)xdr_long, 1161 (caddr_t)&bad)) 1162 syslog(LOG_ERR, "can't send reply"); 1163 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 1164 return; 1165 } 1166 if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs, 1167 (caddr_t)&fhr)) 1168 syslog(LOG_ERR, "can't send reply"); 1169 if (!lookup_failed) 1170 add_mlist(host, dirpath); 1171 else 1172 add_mlist(numerichost, dirpath); 1173 if (debug) 1174 warnx("mount successful"); 1175 if (dolog) 1176 syslog(LOG_NOTICE, 1177 "mount request succeeded from %s for %s", 1178 numerichost, dirpath); 1179 } else { 1180 if (!bad) 1181 bad = EACCES; 1182 syslog(LOG_NOTICE, 1183 "mount request denied from %s for %s", 1184 numerichost, dirpath); 1185 } 1186 1187 if (bad && !svc_sendreply(transp, (xdrproc_t)xdr_long, 1188 (caddr_t)&bad)) 1189 syslog(LOG_ERR, "can't send reply"); 1190 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 1191 return; 1192 case MOUNTPROC_DUMP: 1193 if (!svc_sendreply(transp, (xdrproc_t)xdr_mlist, (caddr_t)NULL)) 1194 syslog(LOG_ERR, "can't send reply"); 1195 else if (dolog) 1196 syslog(LOG_NOTICE, 1197 "dump request succeeded from %s", 1198 numerichost); 1199 return; 1200 case MOUNTPROC_UMNT: 1201 if (sport >= IPPORT_RESERVED && resvport_only) { 1202 syslog(LOG_NOTICE, 1203 "umount request from %s from unprivileged port", 1204 numerichost); 1205 svcerr_weakauth(transp); 1206 return; 1207 } 1208 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) { 1209 syslog(LOG_NOTICE, "undecodable umount request from %s", 1210 numerichost); 1211 svcerr_decode(transp); 1212 return; 1213 } 1214 if (realpath(rpcpath, dirpath) == NULL) { 1215 syslog(LOG_NOTICE, "umount request from %s " 1216 "for non existent path %s", 1217 numerichost, dirpath); 1218 } 1219 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL)) 1220 syslog(LOG_ERR, "can't send reply"); 1221 if (!lookup_failed) 1222 del_mlist(host, dirpath); 1223 del_mlist(numerichost, dirpath); 1224 if (dolog) 1225 syslog(LOG_NOTICE, 1226 "umount request succeeded from %s for %s", 1227 numerichost, dirpath); 1228 return; 1229 case MOUNTPROC_UMNTALL: 1230 if (sport >= IPPORT_RESERVED && resvport_only) { 1231 syslog(LOG_NOTICE, 1232 "umountall request from %s from unprivileged port", 1233 numerichost); 1234 svcerr_weakauth(transp); 1235 return; 1236 } 1237 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL)) 1238 syslog(LOG_ERR, "can't send reply"); 1239 if (!lookup_failed) 1240 del_mlist(host, NULL); 1241 del_mlist(numerichost, NULL); 1242 if (dolog) 1243 syslog(LOG_NOTICE, 1244 "umountall request succeeded from %s", 1245 numerichost); 1246 return; 1247 case MOUNTPROC_EXPORT: 1248 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, (caddr_t)NULL)) 1249 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist_brief, 1250 (caddr_t)NULL)) 1251 syslog(LOG_ERR, "can't send reply"); 1252 if (dolog) 1253 syslog(LOG_NOTICE, 1254 "export request succeeded from %s", 1255 numerichost); 1256 return; 1257 default: 1258 svcerr_noproc(transp); 1259 return; 1260 } 1261 } 1262 1263 /* 1264 * Xdr conversion for a dirpath string 1265 */ 1266 static int 1267 xdr_dir(XDR *xdrsp, char *dirp) 1268 { 1269 return (xdr_string(xdrsp, &dirp, MNTPATHLEN)); 1270 } 1271 1272 /* 1273 * Xdr routine to generate file handle reply 1274 */ 1275 static int 1276 xdr_fhs(XDR *xdrsp, caddr_t cp) 1277 { 1278 struct fhreturn *fhrp = (struct fhreturn *)cp; 1279 u_long ok = 0, len, auth; 1280 int i; 1281 1282 if (!xdr_long(xdrsp, &ok)) 1283 return (0); 1284 switch (fhrp->fhr_vers) { 1285 case 1: 1286 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH)); 1287 case 3: 1288 len = NFSX_V3FH; 1289 if (!xdr_long(xdrsp, &len)) 1290 return (0); 1291 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len)) 1292 return (0); 1293 if (fhrp->fhr_numsecflavors) { 1294 if (!xdr_int(xdrsp, &fhrp->fhr_numsecflavors)) 1295 return (0); 1296 for (i = 0; i < fhrp->fhr_numsecflavors; i++) 1297 if (!xdr_int(xdrsp, &fhrp->fhr_secflavors[i])) 1298 return (0); 1299 return (1); 1300 } else { 1301 auth = AUTH_SYS; 1302 len = 1; 1303 if (!xdr_long(xdrsp, &len)) 1304 return (0); 1305 return (xdr_long(xdrsp, &auth)); 1306 } 1307 } 1308 return (0); 1309 } 1310 1311 static int 1312 xdr_mlist(XDR *xdrsp, caddr_t cp __unused) 1313 { 1314 struct mountlist *mlp; 1315 int true = 1; 1316 int false = 0; 1317 char *strp; 1318 1319 SLIST_FOREACH(mlp, &mlhead, next) { 1320 if (!xdr_bool(xdrsp, &true)) 1321 return (0); 1322 strp = &mlp->ml_host[0]; 1323 if (!xdr_string(xdrsp, &strp, MNTNAMLEN)) 1324 return (0); 1325 strp = &mlp->ml_dirp[0]; 1326 if (!xdr_string(xdrsp, &strp, MNTPATHLEN)) 1327 return (0); 1328 } 1329 if (!xdr_bool(xdrsp, &false)) 1330 return (0); 1331 return (1); 1332 } 1333 1334 /* 1335 * Xdr conversion for export list 1336 */ 1337 static int 1338 xdr_explist_common(XDR *xdrsp, caddr_t cp __unused, int brief) 1339 { 1340 struct exportlist *ep; 1341 int false = 0; 1342 int putdef; 1343 sigset_t sighup_mask; 1344 int i; 1345 1346 sigemptyset(&sighup_mask); 1347 sigaddset(&sighup_mask, SIGHUP); 1348 sigprocmask(SIG_BLOCK, &sighup_mask, NULL); 1349 1350 for (i = 0; i < exphashsize; i++) 1351 SLIST_FOREACH(ep, &exphead[i], entries) { 1352 putdef = 0; 1353 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir, 1354 &putdef, brief)) 1355 goto errout; 1356 if (ep->ex_defdir && putdef == 0 && 1357 put_exlist(ep->ex_defdir, xdrsp, NULL, 1358 &putdef, brief)) 1359 goto errout; 1360 } 1361 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 1362 if (!xdr_bool(xdrsp, &false)) 1363 return (0); 1364 return (1); 1365 errout: 1366 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 1367 return (0); 1368 } 1369 1370 /* 1371 * Called from xdr_explist() to traverse the tree and export the 1372 * directory paths. 1373 */ 1374 static int 1375 put_exlist(struct dirlist *dp, XDR *xdrsp, struct dirlist *adp, int *putdefp, 1376 int brief) 1377 { 1378 struct grouplist *grp; 1379 struct hostlist *hp; 1380 int true = 1; 1381 int false = 0; 1382 int gotalldir = 0; 1383 char *strp; 1384 1385 if (dp) { 1386 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp, brief)) 1387 return (1); 1388 if (!xdr_bool(xdrsp, &true)) 1389 return (1); 1390 strp = dp->dp_dirp; 1391 if (!xdr_string(xdrsp, &strp, MNTPATHLEN)) 1392 return (1); 1393 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) { 1394 gotalldir = 1; 1395 *putdefp = 1; 1396 } 1397 if (brief) { 1398 if (!xdr_bool(xdrsp, &true)) 1399 return (1); 1400 strp = "(...)"; 1401 if (!xdr_string(xdrsp, &strp, MNTPATHLEN)) 1402 return (1); 1403 } else if ((dp->dp_flag & DP_DEFSET) == 0 && 1404 (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) { 1405 hp = dp->dp_hosts; 1406 while (hp) { 1407 grp = hp->ht_grp; 1408 if (grp->gr_type == GT_HOST) { 1409 if (!xdr_bool(xdrsp, &true)) 1410 return (1); 1411 strp = grp->gr_ptr.gt_addrinfo->ai_canonname; 1412 if (!xdr_string(xdrsp, &strp, 1413 MNTNAMLEN)) 1414 return (1); 1415 } else if (grp->gr_type == GT_NET) { 1416 if (!xdr_bool(xdrsp, &true)) 1417 return (1); 1418 strp = grp->gr_ptr.gt_net.nt_name; 1419 if (!xdr_string(xdrsp, &strp, 1420 MNTNAMLEN)) 1421 return (1); 1422 } 1423 hp = hp->ht_next; 1424 if (gotalldir && hp == (struct hostlist *)NULL) { 1425 hp = adp->dp_hosts; 1426 gotalldir = 0; 1427 } 1428 } 1429 } 1430 if (!xdr_bool(xdrsp, &false)) 1431 return (1); 1432 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp, brief)) 1433 return (1); 1434 } 1435 return (0); 1436 } 1437 1438 static int 1439 xdr_explist(XDR *xdrsp, caddr_t cp) 1440 { 1441 1442 return xdr_explist_common(xdrsp, cp, 0); 1443 } 1444 1445 static int 1446 xdr_explist_brief(XDR *xdrsp, caddr_t cp) 1447 { 1448 1449 return xdr_explist_common(xdrsp, cp, 1); 1450 } 1451 1452 static char *line; 1453 static size_t linesize; 1454 static FILE *exp_file; 1455 1456 /* 1457 * Get the export list from one, currently open file 1458 */ 1459 static void 1460 get_exportlist_one(int passno) 1461 { 1462 struct exportlist *ep; 1463 struct grouplist *grp, *tgrp, *savgrp; 1464 struct dirlist *dirhead; 1465 struct statfs fsb; 1466 struct xucred anon; 1467 char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc; 1468 int len, has_host, exflags, got_nondir, dirplen, netgrp; 1469 1470 v4root_phase = 0; 1471 dirhead = (struct dirlist *)NULL; 1472 while (get_line()) { 1473 if (debug) 1474 warnx("got line %s", line); 1475 cp = line; 1476 nextfield(&cp, &endcp); 1477 if (*cp == '#') 1478 goto nextline; 1479 1480 /* 1481 * Set defaults. 1482 */ 1483 has_host = FALSE; 1484 anon = def_anon; 1485 exflags = MNT_EXPORTED; 1486 got_nondir = 0; 1487 opt_flags = 0; 1488 ep = (struct exportlist *)NULL; 1489 dirp = NULL; 1490 1491 /* 1492 * Handle the V4 root dir. 1493 */ 1494 if (*cp == 'V' && *(cp + 1) == '4' && *(cp + 2) == ':') { 1495 /* 1496 * V4: just indicates that it is the v4 root point, 1497 * so skip over that and set v4root_phase. 1498 */ 1499 if (v4root_phase > 0) { 1500 syslog(LOG_ERR, "V4:duplicate line, ignored"); 1501 goto nextline; 1502 } 1503 v4root_phase = 1; 1504 cp += 3; 1505 nextfield(&cp, &endcp); 1506 } 1507 1508 /* 1509 * Create new exports list entry 1510 */ 1511 len = endcp-cp; 1512 tgrp = grp = get_grp(); 1513 while (len > 0) { 1514 if (len > MNTNAMLEN) { 1515 getexp_err(ep, tgrp, "mountpoint too long"); 1516 goto nextline; 1517 } 1518 if (*cp == '-') { 1519 if (ep == (struct exportlist *)NULL) { 1520 getexp_err(ep, tgrp, 1521 "flag before export path definition"); 1522 goto nextline; 1523 } 1524 if (debug) 1525 warnx("doing opt %s", cp); 1526 got_nondir = 1; 1527 if (do_opt(&cp, &endcp, ep, grp, &has_host, 1528 &exflags, &anon)) { 1529 getexp_err(ep, tgrp, NULL); 1530 goto nextline; 1531 } 1532 } else if (*cp == '/') { 1533 savedc = *endcp; 1534 *endcp = '\0'; 1535 if (v4root_phase > 1) { 1536 if (dirp != NULL) { 1537 getexp_err(ep, tgrp, "Multiple V4 dirs"); 1538 goto nextline; 1539 } 1540 } 1541 if (check_dirpath(cp) && 1542 statfs(cp, &fsb) >= 0) { 1543 if ((fsb.f_flags & MNT_AUTOMOUNTED) != 0) 1544 syslog(LOG_ERR, "Warning: exporting of " 1545 "automounted fs %s not supported", cp); 1546 if (got_nondir) { 1547 getexp_err(ep, tgrp, "dirs must be first"); 1548 goto nextline; 1549 } 1550 if (v4root_phase == 1) { 1551 if (dirp != NULL) { 1552 getexp_err(ep, tgrp, "Multiple V4 dirs"); 1553 goto nextline; 1554 } 1555 if (strlen(v4root_dirpath) == 0) { 1556 strlcpy(v4root_dirpath, cp, 1557 sizeof (v4root_dirpath)); 1558 } else if (strcmp(v4root_dirpath, cp) 1559 != 0) { 1560 syslog(LOG_ERR, 1561 "different V4 dirpath %s", cp); 1562 getexp_err(ep, tgrp, NULL); 1563 goto nextline; 1564 } 1565 dirp = cp; 1566 v4root_phase = 2; 1567 got_nondir = 1; 1568 ep = get_exp(); 1569 } else { 1570 if (ep) { 1571 if (ep->ex_fs.val[0] != 1572 fsb.f_fsid.val[0] || 1573 ep->ex_fs.val[1] != 1574 fsb.f_fsid.val[1]) { 1575 getexp_err(ep, tgrp, 1576 "fsid mismatch"); 1577 goto nextline; 1578 } 1579 } else { 1580 /* 1581 * See if this directory is already 1582 * in the list. 1583 */ 1584 ep = ex_search(&fsb.f_fsid, exphead); 1585 if (ep == (struct exportlist *)NULL) { 1586 ep = get_exp(); 1587 ep->ex_fs = fsb.f_fsid; 1588 ep->ex_fsdir = strdup(fsb.f_mntonname); 1589 if (ep->ex_fsdir == NULL) 1590 out_of_mem(); 1591 if (debug) 1592 warnx( 1593 "making new ep fs=0x%x,0x%x", 1594 fsb.f_fsid.val[0], 1595 fsb.f_fsid.val[1]); 1596 } else if (debug) 1597 warnx("found ep fs=0x%x,0x%x", 1598 fsb.f_fsid.val[0], 1599 fsb.f_fsid.val[1]); 1600 } 1601 1602 /* 1603 * Add dirpath to export mount point. 1604 */ 1605 dirp = add_expdir(&dirhead, cp, len); 1606 dirplen = len; 1607 } 1608 } else { 1609 getexp_err(ep, tgrp, 1610 "symbolic link in export path or statfs failed"); 1611 goto nextline; 1612 } 1613 *endcp = savedc; 1614 } else { 1615 savedc = *endcp; 1616 *endcp = '\0'; 1617 got_nondir = 1; 1618 if (ep == (struct exportlist *)NULL) { 1619 getexp_err(ep, tgrp, 1620 "host(s) before export path definition"); 1621 goto nextline; 1622 } 1623 1624 /* 1625 * Get the host or netgroup. 1626 */ 1627 setnetgrent(cp); 1628 netgrp = getnetgrent(&hst, &usr, &dom); 1629 do { 1630 if (has_host) { 1631 grp->gr_next = get_grp(); 1632 grp = grp->gr_next; 1633 } 1634 if (netgrp) { 1635 if (hst == 0) { 1636 syslog(LOG_ERR, 1637 "null hostname in netgroup %s, skipping", cp); 1638 grp->gr_type = GT_IGNORE; 1639 } else if (get_host(hst, grp, tgrp)) { 1640 syslog(LOG_ERR, 1641 "bad host %s in netgroup %s, skipping", hst, cp); 1642 grp->gr_type = GT_IGNORE; 1643 } 1644 } else if (get_host(cp, grp, tgrp)) { 1645 syslog(LOG_ERR, "bad host %s, skipping", cp); 1646 grp->gr_type = GT_IGNORE; 1647 } 1648 has_host = TRUE; 1649 } while (netgrp && getnetgrent(&hst, &usr, &dom)); 1650 endnetgrent(); 1651 *endcp = savedc; 1652 } 1653 cp = endcp; 1654 nextfield(&cp, &endcp); 1655 len = endcp - cp; 1656 } 1657 if (check_options(dirhead)) { 1658 getexp_err(ep, tgrp, NULL); 1659 goto nextline; 1660 } 1661 if (!has_host) { 1662 grp->gr_type = GT_DEFAULT; 1663 if (debug) 1664 warnx("adding a default entry"); 1665 1666 /* 1667 * Don't allow a network export coincide with a list of 1668 * host(s) on the same line. 1669 */ 1670 } else if ((opt_flags & OP_NET) && tgrp->gr_next) { 1671 getexp_err(ep, tgrp, "network/host conflict"); 1672 goto nextline; 1673 1674 /* 1675 * If an export list was specified on this line, make sure 1676 * that we have at least one valid entry, otherwise skip it. 1677 */ 1678 } else { 1679 grp = tgrp; 1680 while (grp && grp->gr_type == GT_IGNORE) 1681 grp = grp->gr_next; 1682 if (! grp) { 1683 getexp_err(ep, tgrp, "no valid entries"); 1684 goto nextline; 1685 } 1686 } 1687 1688 if (v4root_phase == 1) { 1689 getexp_err(ep, tgrp, "V4:root, no dirp, ignored"); 1690 goto nextline; 1691 } 1692 1693 /* 1694 * Loop through hosts, pushing the exports into the kernel. 1695 * After loop, tgrp points to the start of the list and 1696 * grp points to the last entry in the list. 1697 * Do not do the do_mount() for passno == 1, since the 1698 * second pass will do it, as required. 1699 */ 1700 grp = tgrp; 1701 do { 1702 grp->gr_exflags = exflags; 1703 grp->gr_anon = anon; 1704 if (v4root_phase == 2 && passno == 0) 1705 LOGDEBUG("do_mount v4root"); 1706 if (passno == 0 && do_mount(ep, grp, exflags, &anon, 1707 dirp, dirplen, &fsb, ep->ex_numsecflavors, 1708 ep->ex_secflavors)) { 1709 getexp_err(ep, tgrp, NULL); 1710 goto nextline; 1711 } 1712 } while (grp->gr_next && (grp = grp->gr_next)); 1713 1714 /* 1715 * For V4: don't enter in mount lists. 1716 */ 1717 if (v4root_phase > 0 && v4root_phase <= 2) { 1718 /* 1719 * These structures are used for the reload, 1720 * so save them for that case. Otherwise, just 1721 * free them up now. 1722 */ 1723 if (passno == 1 && ep != NULL) { 1724 savgrp = tgrp; 1725 while (tgrp != NULL) { 1726 /* 1727 * Save the security flavors and exflags 1728 * for this host set in the groups. 1729 */ 1730 tgrp->gr_numsecflavors = 1731 ep->ex_numsecflavors; 1732 if (ep->ex_numsecflavors > 0) 1733 memcpy(tgrp->gr_secflavors, 1734 ep->ex_secflavors, 1735 sizeof(ep->ex_secflavors)); 1736 tgrp = tgrp->gr_next; 1737 } 1738 if (v4root_ep == NULL) { 1739 v4root_ep = ep; 1740 ep = NULL; /* Don't free below. */ 1741 } 1742 grp->gr_next = v4root_ep->ex_grphead; 1743 v4root_ep->ex_grphead = savgrp; 1744 } 1745 if (ep != NULL) 1746 free_exp(ep); 1747 while (tgrp != NULL) { 1748 grp = tgrp; 1749 tgrp = tgrp->gr_next; 1750 free_grp(grp); 1751 } 1752 goto nextline; 1753 } 1754 1755 /* 1756 * Success. Update the data structures. 1757 */ 1758 if (has_host) { 1759 hang_dirp(dirhead, tgrp, ep, opt_flags, &anon, exflags); 1760 grp->gr_next = ep->ex_grphead; 1761 ep->ex_grphead = tgrp; 1762 } else { 1763 hang_dirp(dirhead, (struct grouplist *)NULL, ep, 1764 opt_flags, &anon, exflags); 1765 free_grp(grp); 1766 } 1767 dirhead = (struct dirlist *)NULL; 1768 if ((ep->ex_flag & EX_LINKED) == 0) { 1769 insert_exports(ep, exphead); 1770 1771 ep->ex_flag |= EX_LINKED; 1772 } 1773 nextline: 1774 v4root_phase = 0; 1775 if (dirhead) { 1776 free_dir(dirhead); 1777 dirhead = (struct dirlist *)NULL; 1778 } 1779 } 1780 } 1781 1782 /* 1783 * Get the export list from all specified files 1784 */ 1785 static void 1786 get_exportlist(int passno) 1787 { 1788 struct export_args export; 1789 struct iovec *iov; 1790 struct statfs *mntbufp; 1791 char errmsg[255]; 1792 int num, i; 1793 int iovlen; 1794 struct nfsex_args eargs; 1795 FILE *debug_file; 1796 1797 if ((debug_file = fopen(_PATH_MOUNTDDEBUG, "r")) != NULL) { 1798 fclose(debug_file); 1799 logdebug = 1; 1800 } else 1801 logdebug = 0; 1802 LOGDEBUG("passno=%d", passno); 1803 v4root_dirpath[0] = '\0'; 1804 free_v4rootexp(); 1805 if (passno == 1) { 1806 /* 1807 * Save the current lists as old ones, so that the new lists 1808 * can be compared with the old ones in the 2nd pass. 1809 */ 1810 for (i = 0; i < exphashsize; i++) { 1811 SLIST_FIRST(&oldexphead[i]) = SLIST_FIRST(&exphead[i]); 1812 SLIST_INIT(&exphead[i]); 1813 } 1814 1815 /* Note that the public fh has not yet been set. */ 1816 has_set_publicfh = 0; 1817 1818 /* Read the export file(s) and process them */ 1819 read_exportfile(passno); 1820 } else { 1821 /* 1822 * Just make the old lists empty. 1823 * exphashsize == 0 for the first call, before oldexphead 1824 * has been initialized-->loop won't be executed. 1825 */ 1826 for (i = 0; i < exphashsize; i++) 1827 SLIST_INIT(&oldexphead[i]); 1828 } 1829 1830 bzero(&export, sizeof(export)); 1831 export.ex_flags = MNT_DELEXPORT; 1832 iov = NULL; 1833 iovlen = 0; 1834 bzero(errmsg, sizeof(errmsg)); 1835 1836 if (suspend_nfsd != 0) 1837 (void)nfssvc(NFSSVC_SUSPENDNFSD, NULL); 1838 /* 1839 * Delete the old V4 root dir. 1840 */ 1841 bzero(&eargs, sizeof (eargs)); 1842 eargs.export.ex_flags = MNT_DELEXPORT; 1843 if (nfssvc(NFSSVC_V4ROOTEXPORT, (caddr_t)&eargs) < 0 && 1844 errno != ENOENT) 1845 syslog(LOG_ERR, "Can't delete exports for V4:"); 1846 1847 build_iovec(&iov, &iovlen, "fstype", NULL, 0); 1848 build_iovec(&iov, &iovlen, "fspath", NULL, 0); 1849 build_iovec(&iov, &iovlen, "from", NULL, 0); 1850 build_iovec(&iov, &iovlen, "update", NULL, 0); 1851 build_iovec(&iov, &iovlen, "export", &export, 1852 sizeof(export)); 1853 build_iovec(&iov, &iovlen, "errmsg", errmsg, 1854 sizeof(errmsg)); 1855 1856 /* 1857 * For passno == 1, compare the old and new lists updating the kernel 1858 * exports for any cases that have changed. 1859 * This call is doing the second pass through the lists. 1860 * If it fails, fall back on the bulk reload. 1861 */ 1862 if (passno == 1 && compare_nmount_exportlist(iov, iovlen, errmsg) == 1863 0) { 1864 LOGDEBUG("compareok"); 1865 /* Free up the old lists. */ 1866 free_exports(oldexphead); 1867 } else { 1868 LOGDEBUG("doing passno=0"); 1869 /* 1870 * Clear flag that notes if a public fh has been exported. 1871 * It is set by do_mount() if MNT_EXPUBLIC is set for the entry. 1872 */ 1873 has_publicfh = 0; 1874 1875 /* exphead == NULL if not yet allocated (first call). */ 1876 if (exphead != NULL) { 1877 /* 1878 * First, get rid of the old lists. 1879 */ 1880 free_exports(exphead); 1881 free_exports(oldexphead); 1882 } 1883 1884 /* 1885 * And delete exports that are in the kernel for all local 1886 * filesystems. 1887 * XXX: Should know how to handle all local exportable 1888 * filesystems. 1889 */ 1890 num = getmntinfo(&mntbufp, MNT_NOWAIT); 1891 1892 /* Allocate hash tables, for first call. */ 1893 if (exphead == NULL) { 1894 /* Target an average linked list length of 10. */ 1895 exphashsize = num / 10; 1896 if (exphashsize < 1) 1897 exphashsize = 1; 1898 else if (exphashsize > 100000) 1899 exphashsize = 100000; 1900 exphead = malloc(exphashsize * sizeof(*exphead)); 1901 oldexphead = malloc(exphashsize * sizeof(*oldexphead)); 1902 if (exphead == NULL || oldexphead == NULL) 1903 errx(1, "Can't malloc hash tables"); 1904 1905 for (i = 0; i < exphashsize; i++) { 1906 SLIST_INIT(&exphead[i]); 1907 SLIST_INIT(&oldexphead[i]); 1908 } 1909 } 1910 1911 for (i = 0; i < num; i++) 1912 delete_export(iov, iovlen, &mntbufp[i], errmsg); 1913 1914 1915 /* Read the export file(s) and process them */ 1916 read_exportfile(0); 1917 } 1918 1919 if (iov != NULL) { 1920 /* Free strings allocated by strdup() in getmntopts.c */ 1921 free(iov[0].iov_base); /* fstype */ 1922 free(iov[2].iov_base); /* fspath */ 1923 free(iov[4].iov_base); /* from */ 1924 free(iov[6].iov_base); /* update */ 1925 free(iov[8].iov_base); /* export */ 1926 free(iov[10].iov_base); /* errmsg */ 1927 1928 /* free iov, allocated by realloc() */ 1929 free(iov); 1930 iovlen = 0; 1931 } 1932 1933 /* 1934 * If there was no public fh, clear any previous one set. 1935 */ 1936 if (has_publicfh == 0) { 1937 LOGDEBUG("clear public fh"); 1938 (void) nfssvc(NFSSVC_NOPUBLICFH, NULL); 1939 } 1940 1941 /* Resume the nfsd. If they weren't suspended, this is harmless. */ 1942 (void)nfssvc(NFSSVC_RESUMENFSD, NULL); 1943 LOGDEBUG("eo get_exportlist"); 1944 } 1945 1946 /* 1947 * Insert an export entry in the appropriate list. 1948 */ 1949 static void 1950 insert_exports(struct exportlist *ep, struct exportlisthead *exhp) 1951 { 1952 uint32_t i; 1953 1954 i = EXPHASH(&ep->ex_fs); 1955 LOGDEBUG("fs=%s hash=%i", ep->ex_fsdir, i); 1956 SLIST_INSERT_HEAD(&exhp[i], ep, entries); 1957 } 1958 1959 /* 1960 * Free up the exports lists passed in as arguments. 1961 */ 1962 static void 1963 free_exports(struct exportlisthead *exhp) 1964 { 1965 struct exportlist *ep, *ep2; 1966 int i; 1967 1968 for (i = 0; i < exphashsize; i++) { 1969 SLIST_FOREACH_SAFE(ep, &exhp[i], entries, ep2) { 1970 SLIST_REMOVE(&exhp[i], ep, exportlist, entries); 1971 free_exp(ep); 1972 } 1973 SLIST_INIT(&exhp[i]); 1974 } 1975 } 1976 1977 /* 1978 * Read the exports file(s) and call get_exportlist_one() for each line. 1979 */ 1980 static void 1981 read_exportfile(int passno) 1982 { 1983 int done, i; 1984 1985 /* 1986 * Read in the exports file and build the list, calling 1987 * nmount() as we go along to push the export rules into the kernel. 1988 */ 1989 done = 0; 1990 for (i = 0; exnames[i] != NULL; i++) { 1991 if (debug) 1992 warnx("reading exports from %s", exnames[i]); 1993 if ((exp_file = fopen(exnames[i], "r")) == NULL) { 1994 syslog(LOG_WARNING, "can't open %s", exnames[i]); 1995 continue; 1996 } 1997 get_exportlist_one(passno); 1998 fclose(exp_file); 1999 done++; 2000 } 2001 if (done == 0) { 2002 syslog(LOG_ERR, "can't open any exports file"); 2003 exit(2); 2004 } 2005 } 2006 2007 /* 2008 * Compare the export lists against the old ones and do nmount() operations 2009 * for any cases that have changed. This avoids doing nmount() for entries 2010 * that have not changed. 2011 * Return 0 upon success, 1 otherwise. 2012 */ 2013 static int 2014 compare_nmount_exportlist(struct iovec *iov, int iovlen, char *errmsg) 2015 { 2016 struct exportlist *ep, *oep; 2017 struct grouplist *grp; 2018 struct statfs fs, ofs; 2019 int i, ret; 2020 2021 /* 2022 * Loop through the current list and look for an entry in the old 2023 * list. 2024 * If found, check to see if it the same. 2025 * If it is not the same, delete and re-export. 2026 * Then mark it done on the old list. 2027 * else (not found) 2028 * export it. 2029 * Any entries left in the old list after processing must have their 2030 * exports deleted. 2031 */ 2032 for (i = 0; i < exphashsize; i++) 2033 SLIST_FOREACH(ep, &exphead[i], entries) { 2034 LOGDEBUG("foreach ep=%s", ep->ex_fsdir); 2035 oep = ex_search(&ep->ex_fs, oldexphead); 2036 if (oep != NULL) { 2037 /* 2038 * Check the mount paths are the same. 2039 * If not, return 1 so that the reload of the 2040 * exports will be done in bulk, the 2041 * passno == 0 way. 2042 */ 2043 LOGDEBUG("found old exp"); 2044 if (strcmp(ep->ex_fsdir, oep->ex_fsdir) != 0) 2045 return (1); 2046 LOGDEBUG("same fsdir"); 2047 /* 2048 * Test to see if the entry is the same. 2049 * If not the same delete exports and 2050 * re-export. 2051 */ 2052 if (compare_export(ep, oep) != 0) { 2053 /* 2054 * Clear has_publicfh if if was set 2055 * in the old exports, but only if it 2056 * has not been set during processing of 2057 * the exports for this pass, as 2058 * indicated by has_set_publicfh. 2059 */ 2060 if (has_set_publicfh == 0 && 2061 (oep->ex_flag & EX_PUBLICFH) != 0) 2062 has_publicfh = 0; 2063 2064 /* Delete and re-export. */ 2065 if (statfs(ep->ex_fsdir, &fs) < 0) 2066 return (1); 2067 delete_export(iov, iovlen, &fs, errmsg); 2068 ret = do_export_mount(ep, &fs); 2069 if (ret != 0) 2070 return (ret); 2071 } 2072 oep->ex_flag |= EX_DONE; 2073 LOGDEBUG("exdone"); 2074 } else { 2075 LOGDEBUG("not found so export"); 2076 /* Not found, so do export. */ 2077 if (statfs(ep->ex_fsdir, &fs) < 0) 2078 return (1); 2079 ret = do_export_mount(ep, &fs); 2080 if (ret != 0) 2081 return (ret); 2082 } 2083 } 2084 2085 /* Delete exports not done. */ 2086 for (i = 0; i < exphashsize; i++) 2087 SLIST_FOREACH(oep, &oldexphead[i], entries) { 2088 if ((oep->ex_flag & EX_DONE) == 0) { 2089 LOGDEBUG("not done delete=%s", oep->ex_fsdir); 2090 if (statfs(oep->ex_fsdir, &ofs) >= 0 && 2091 oep->ex_fs.val[0] == ofs.f_fsid.val[0] && 2092 oep->ex_fs.val[1] == ofs.f_fsid.val[1]) { 2093 LOGDEBUG("do delete"); 2094 /* 2095 * Clear has_publicfh if if was set 2096 * in the old exports, but only if it 2097 * has not been set during processing of 2098 * the exports for this pass, as 2099 * indicated by has_set_publicfh. 2100 */ 2101 if (has_set_publicfh == 0 && 2102 (oep->ex_flag & EX_PUBLICFH) != 0) 2103 has_publicfh = 0; 2104 2105 delete_export(iov, iovlen, &ofs, 2106 errmsg); 2107 } 2108 } 2109 } 2110 2111 /* Do the V4 root exports, as required. */ 2112 grp = NULL; 2113 if (v4root_ep != NULL) 2114 grp = v4root_ep->ex_grphead; 2115 v4root_phase = 2; 2116 while (v4root_ep != NULL && grp != NULL) { 2117 LOGDEBUG("v4root expath=%s", v4root_dirpath); 2118 ret = do_mount(v4root_ep, grp, grp->gr_exflags, &grp->gr_anon, 2119 v4root_dirpath, strlen(v4root_dirpath), &fs, 2120 grp->gr_numsecflavors, grp->gr_secflavors); 2121 if (ret != 0) { 2122 v4root_phase = 0; 2123 return (ret); 2124 } 2125 grp = grp->gr_next; 2126 } 2127 v4root_phase = 0; 2128 free_v4rootexp(); 2129 return (0); 2130 } 2131 2132 /* 2133 * Compare old and current exportlist entries for the fsid and return 0 2134 * if they are the same, 1 otherwise. 2135 */ 2136 static int 2137 compare_export(struct exportlist *ep, struct exportlist *oep) 2138 { 2139 struct grouplist *grp, *ogrp; 2140 2141 if (strcmp(ep->ex_fsdir, oep->ex_fsdir) != 0) 2142 return (1); 2143 if ((ep->ex_flag & EX_DEFSET) != (oep->ex_flag & EX_DEFSET)) 2144 return (1); 2145 if ((ep->ex_defdir != NULL && oep->ex_defdir == NULL) || 2146 (ep->ex_defdir == NULL && oep->ex_defdir != NULL)) 2147 return (1); 2148 if (ep->ex_defdir != NULL && (ep->ex_defdir->dp_flag & DP_DEFSET) != 2149 (oep->ex_defdir->dp_flag & DP_DEFSET)) 2150 return (1); 2151 if ((ep->ex_flag & EX_DEFSET) != 0 && (ep->ex_defnumsecflavors != 2152 oep->ex_defnumsecflavors || ep->ex_defexflags != 2153 oep->ex_defexflags || compare_cred(&ep->ex_defanon, 2154 &oep->ex_defanon) != 0 || compare_secflavor(ep->ex_defsecflavors, 2155 oep->ex_defsecflavors, ep->ex_defnumsecflavors) != 0)) 2156 return (1); 2157 2158 /* Now, check all the groups. */ 2159 for (ogrp = oep->ex_grphead; ogrp != NULL; ogrp = ogrp->gr_next) 2160 ogrp->gr_flag = 0; 2161 for (grp = ep->ex_grphead; grp != NULL; grp = grp->gr_next) { 2162 for (ogrp = oep->ex_grphead; ogrp != NULL; ogrp = 2163 ogrp->gr_next) 2164 if ((ogrp->gr_flag & GR_FND) == 0 && 2165 grp->gr_numsecflavors == ogrp->gr_numsecflavors && 2166 grp->gr_exflags == ogrp->gr_exflags && 2167 compare_cred(&grp->gr_anon, &ogrp->gr_anon) == 0 && 2168 compare_secflavor(grp->gr_secflavors, 2169 ogrp->gr_secflavors, grp->gr_numsecflavors) == 0) 2170 break; 2171 if (ogrp != NULL) 2172 ogrp->gr_flag |= GR_FND; 2173 else 2174 return (1); 2175 } 2176 for (ogrp = oep->ex_grphead; ogrp != NULL; ogrp = ogrp->gr_next) 2177 if ((ogrp->gr_flag & GR_FND) == 0) 2178 return (1); 2179 return (0); 2180 } 2181 2182 /* 2183 * This algorithm compares two arrays of "n" items. It returns 0 if they are 2184 * the "same" and 1 otherwise. Although suboptimal, it is always safe to 2185 * return 1, which makes compare_nmount_export() reload the exports entry. 2186 * "same" refers to having the same set of values in the two arrays. 2187 * The arrays are in no particular order and duplicates (multiple entries 2188 * in an array with the same value) is allowed. 2189 * The algorithm is inefficient, but the common case of indentical arrays is 2190 * handled first and "n" is normally fairly small. 2191 * Since the two functions need the same algorithm but for arrays of 2192 * different types (gid_t vs int), this is done as a macro. 2193 */ 2194 #define COMPARE_ARRAYS(a1, a2, n) \ 2195 do { \ 2196 int fnd, fndarray[(n)], i, j; \ 2197 /* Handle common case of identical arrays. */ \ 2198 for (i = 0; i < (n); i++) \ 2199 if ((a1)[i] != (a2)[i]) \ 2200 break; \ 2201 if (i == (n)) \ 2202 return (0); \ 2203 for (i = 0; i < (n); i++) \ 2204 fndarray[i] = 0; \ 2205 for (i = 0; i < (n); i++) { \ 2206 fnd = 0; \ 2207 for (j = 0; j < (n); j++) { \ 2208 if ((a1)[i] == (a2)[j]) { \ 2209 fndarray[j] = 1; \ 2210 fnd = 1; \ 2211 } \ 2212 } \ 2213 if (fnd == 0) \ 2214 return (1); \ 2215 } \ 2216 for (i = 0; i < (n); i++) \ 2217 if (fndarray[i] == 0) \ 2218 return (1); \ 2219 return (0); \ 2220 } while (0) 2221 2222 /* 2223 * Compare to struct xucred's. Return 0 if the same and 1 otherwise. 2224 */ 2225 static int 2226 compare_cred(struct xucred *cr0, struct xucred *cr1) 2227 { 2228 2229 if (cr0->cr_uid != cr1->cr_uid || cr0->cr_ngroups != cr1->cr_ngroups) 2230 return (1); 2231 2232 COMPARE_ARRAYS(cr0->cr_groups, cr1->cr_groups, cr0->cr_ngroups); 2233 } 2234 2235 /* 2236 * Compare two lists of security flavors. Return 0 if the same and 1 otherwise. 2237 */ 2238 static int 2239 compare_secflavor(int *sec1, int *sec2, int nsec) 2240 { 2241 2242 COMPARE_ARRAYS(sec1, sec2, nsec); 2243 } 2244 2245 /* 2246 * Delete an exports entry. 2247 */ 2248 static void 2249 delete_export(struct iovec *iov, int iovlen, struct statfs *fsp, char *errmsg) 2250 { 2251 struct xvfsconf vfc; 2252 2253 if (getvfsbyname(fsp->f_fstypename, &vfc) != 0) { 2254 syslog(LOG_ERR, "getvfsbyname() failed for %s", 2255 fsp->f_fstypename); 2256 return; 2257 } 2258 2259 /* 2260 * We do not need to delete "export" flag from 2261 * filesystems that do not have it set. 2262 */ 2263 if (!(fsp->f_flags & MNT_EXPORTED)) 2264 return; 2265 /* 2266 * Do not delete export for network filesystem by 2267 * passing "export" arg to nmount(). 2268 * It only makes sense to do this for local filesystems. 2269 */ 2270 if (vfc.vfc_flags & VFCF_NETWORK) 2271 return; 2272 2273 iov[1].iov_base = fsp->f_fstypename; 2274 iov[1].iov_len = strlen(fsp->f_fstypename) + 1; 2275 iov[3].iov_base = fsp->f_mntonname; 2276 iov[3].iov_len = strlen(fsp->f_mntonname) + 1; 2277 iov[5].iov_base = fsp->f_mntfromname; 2278 iov[5].iov_len = strlen(fsp->f_mntfromname) + 1; 2279 errmsg[0] = '\0'; 2280 2281 /* 2282 * EXDEV is returned when path exists but is not a 2283 * mount point. May happens if raced with unmount. 2284 */ 2285 if (nmount(iov, iovlen, fsp->f_flags) < 0 && errno != ENOENT && 2286 errno != ENOTSUP && errno != EXDEV) { 2287 syslog(LOG_ERR, 2288 "can't delete exports for %s: %m %s", 2289 fsp->f_mntonname, errmsg); 2290 } 2291 } 2292 2293 /* 2294 * Allocate an export list element 2295 */ 2296 static struct exportlist * 2297 get_exp(void) 2298 { 2299 struct exportlist *ep; 2300 2301 ep = (struct exportlist *)calloc(1, sizeof (struct exportlist)); 2302 if (ep == (struct exportlist *)NULL) 2303 out_of_mem(); 2304 return (ep); 2305 } 2306 2307 /* 2308 * Allocate a group list element 2309 */ 2310 static struct grouplist * 2311 get_grp(void) 2312 { 2313 struct grouplist *gp; 2314 2315 gp = (struct grouplist *)calloc(1, sizeof (struct grouplist)); 2316 if (gp == (struct grouplist *)NULL) 2317 out_of_mem(); 2318 return (gp); 2319 } 2320 2321 /* 2322 * Clean up upon an error in get_exportlist(). 2323 */ 2324 static void 2325 getexp_err(struct exportlist *ep, struct grouplist *grp, const char *reason) 2326 { 2327 struct grouplist *tgrp; 2328 2329 if (!(opt_flags & OP_QUIET)) { 2330 if (reason != NULL) 2331 syslog(LOG_ERR, "bad exports list line '%s': %s", line, 2332 reason); 2333 else 2334 syslog(LOG_ERR, "bad exports list line '%s'", line); 2335 } 2336 if (ep && (ep->ex_flag & EX_LINKED) == 0) 2337 free_exp(ep); 2338 while (grp) { 2339 tgrp = grp; 2340 grp = grp->gr_next; 2341 free_grp(tgrp); 2342 } 2343 } 2344 2345 /* 2346 * Search the export list for a matching fs. 2347 */ 2348 static struct exportlist * 2349 ex_search(fsid_t *fsid, struct exportlisthead *exhp) 2350 { 2351 struct exportlist *ep; 2352 uint32_t i; 2353 2354 i = EXPHASH(fsid); 2355 SLIST_FOREACH(ep, &exhp[i], entries) { 2356 if (ep->ex_fs.val[0] == fsid->val[0] && 2357 ep->ex_fs.val[1] == fsid->val[1]) 2358 return (ep); 2359 } 2360 2361 return (ep); 2362 } 2363 2364 /* 2365 * Add a directory path to the list. 2366 */ 2367 static char * 2368 add_expdir(struct dirlist **dpp, char *cp, int len) 2369 { 2370 struct dirlist *dp; 2371 2372 dp = malloc(sizeof (struct dirlist)); 2373 if (dp == (struct dirlist *)NULL) 2374 out_of_mem(); 2375 dp->dp_left = *dpp; 2376 dp->dp_right = (struct dirlist *)NULL; 2377 dp->dp_flag = 0; 2378 dp->dp_hosts = (struct hostlist *)NULL; 2379 dp->dp_dirp = strndup(cp, len); 2380 if (dp->dp_dirp == NULL) 2381 out_of_mem(); 2382 *dpp = dp; 2383 return (dp->dp_dirp); 2384 } 2385 2386 /* 2387 * Hang the dir list element off the dirpath binary tree as required 2388 * and update the entry for host. 2389 */ 2390 static void 2391 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep, 2392 int flags, struct xucred *anoncrp, int exflags) 2393 { 2394 struct hostlist *hp; 2395 struct dirlist *dp2; 2396 2397 if (flags & OP_ALLDIRS) { 2398 if (ep->ex_defdir) 2399 free((caddr_t)dp); 2400 else 2401 ep->ex_defdir = dp; 2402 if (grp == (struct grouplist *)NULL) { 2403 ep->ex_flag |= EX_DEFSET; 2404 ep->ex_defdir->dp_flag |= DP_DEFSET; 2405 /* Save the default security flavors list. */ 2406 ep->ex_defnumsecflavors = ep->ex_numsecflavors; 2407 if (ep->ex_numsecflavors > 0) 2408 memcpy(ep->ex_defsecflavors, ep->ex_secflavors, 2409 sizeof(ep->ex_secflavors)); 2410 ep->ex_defanon = *anoncrp; 2411 ep->ex_defexflags = exflags; 2412 } else while (grp) { 2413 hp = get_ht(); 2414 hp->ht_grp = grp; 2415 hp->ht_next = ep->ex_defdir->dp_hosts; 2416 ep->ex_defdir->dp_hosts = hp; 2417 /* Save the security flavors list for this host set. */ 2418 grp->gr_numsecflavors = ep->ex_numsecflavors; 2419 if (ep->ex_numsecflavors > 0) 2420 memcpy(grp->gr_secflavors, ep->ex_secflavors, 2421 sizeof(ep->ex_secflavors)); 2422 grp = grp->gr_next; 2423 } 2424 } else { 2425 2426 /* 2427 * Loop through the directories adding them to the tree. 2428 */ 2429 while (dp) { 2430 dp2 = dp->dp_left; 2431 add_dlist(&ep->ex_dirl, dp, grp, flags, ep, anoncrp, 2432 exflags); 2433 dp = dp2; 2434 } 2435 } 2436 } 2437 2438 /* 2439 * Traverse the binary tree either updating a node that is already there 2440 * for the new directory or adding the new node. 2441 */ 2442 static void 2443 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp, 2444 int flags, struct exportlist *ep, struct xucred *anoncrp, int exflags) 2445 { 2446 struct dirlist *dp; 2447 struct hostlist *hp; 2448 int cmp; 2449 2450 dp = *dpp; 2451 if (dp) { 2452 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp); 2453 if (cmp > 0) { 2454 add_dlist(&dp->dp_left, newdp, grp, flags, ep, anoncrp, 2455 exflags); 2456 return; 2457 } else if (cmp < 0) { 2458 add_dlist(&dp->dp_right, newdp, grp, flags, ep, anoncrp, 2459 exflags); 2460 return; 2461 } else 2462 free((caddr_t)newdp); 2463 } else { 2464 dp = newdp; 2465 dp->dp_left = (struct dirlist *)NULL; 2466 *dpp = dp; 2467 } 2468 if (grp) { 2469 2470 /* 2471 * Hang all of the host(s) off of the directory point. 2472 */ 2473 do { 2474 hp = get_ht(); 2475 hp->ht_grp = grp; 2476 hp->ht_next = dp->dp_hosts; 2477 dp->dp_hosts = hp; 2478 /* Save the security flavors list for this host set. */ 2479 grp->gr_numsecflavors = ep->ex_numsecflavors; 2480 if (ep->ex_numsecflavors > 0) 2481 memcpy(grp->gr_secflavors, ep->ex_secflavors, 2482 sizeof(ep->ex_secflavors)); 2483 grp = grp->gr_next; 2484 } while (grp); 2485 } else { 2486 ep->ex_flag |= EX_DEFSET; 2487 dp->dp_flag |= DP_DEFSET; 2488 /* Save the default security flavors list. */ 2489 ep->ex_defnumsecflavors = ep->ex_numsecflavors; 2490 if (ep->ex_numsecflavors > 0) 2491 memcpy(ep->ex_defsecflavors, ep->ex_secflavors, 2492 sizeof(ep->ex_secflavors)); 2493 ep->ex_defanon = *anoncrp; 2494 ep->ex_defexflags = exflags; 2495 } 2496 } 2497 2498 /* 2499 * Search for a dirpath on the export point. 2500 */ 2501 static struct dirlist * 2502 dirp_search(struct dirlist *dp, char *dirp) 2503 { 2504 int cmp; 2505 2506 if (dp) { 2507 cmp = strcmp(dp->dp_dirp, dirp); 2508 if (cmp > 0) 2509 return (dirp_search(dp->dp_left, dirp)); 2510 else if (cmp < 0) 2511 return (dirp_search(dp->dp_right, dirp)); 2512 else 2513 return (dp); 2514 } 2515 return (dp); 2516 } 2517 2518 /* 2519 * Scan for a host match in a directory tree. 2520 */ 2521 static int 2522 chk_host(struct dirlist *dp, struct sockaddr *saddr, int *defsetp, 2523 int *hostsetp, int *numsecflavors, int **secflavorsp) 2524 { 2525 struct hostlist *hp; 2526 struct grouplist *grp; 2527 struct addrinfo *ai; 2528 2529 if (dp) { 2530 if (dp->dp_flag & DP_DEFSET) 2531 *defsetp = dp->dp_flag; 2532 hp = dp->dp_hosts; 2533 while (hp) { 2534 grp = hp->ht_grp; 2535 switch (grp->gr_type) { 2536 case GT_HOST: 2537 ai = grp->gr_ptr.gt_addrinfo; 2538 for (; ai; ai = ai->ai_next) { 2539 if (!sacmp(ai->ai_addr, saddr, NULL)) { 2540 *hostsetp = 2541 (hp->ht_flag | DP_HOSTSET); 2542 if (numsecflavors != NULL) { 2543 *numsecflavors = 2544 grp->gr_numsecflavors; 2545 *secflavorsp = 2546 grp->gr_secflavors; 2547 } 2548 return (1); 2549 } 2550 } 2551 break; 2552 case GT_NET: 2553 if (!sacmp(saddr, (struct sockaddr *) 2554 &grp->gr_ptr.gt_net.nt_net, 2555 (struct sockaddr *) 2556 &grp->gr_ptr.gt_net.nt_mask)) { 2557 *hostsetp = (hp->ht_flag | DP_HOSTSET); 2558 if (numsecflavors != NULL) { 2559 *numsecflavors = 2560 grp->gr_numsecflavors; 2561 *secflavorsp = 2562 grp->gr_secflavors; 2563 } 2564 return (1); 2565 } 2566 break; 2567 } 2568 hp = hp->ht_next; 2569 } 2570 } 2571 return (0); 2572 } 2573 2574 /* 2575 * Scan tree for a host that matches the address. 2576 */ 2577 static int 2578 scan_tree(struct dirlist *dp, struct sockaddr *saddr) 2579 { 2580 int defset, hostset; 2581 2582 if (dp) { 2583 if (scan_tree(dp->dp_left, saddr)) 2584 return (1); 2585 if (chk_host(dp, saddr, &defset, &hostset, NULL, NULL)) 2586 return (1); 2587 if (scan_tree(dp->dp_right, saddr)) 2588 return (1); 2589 } 2590 return (0); 2591 } 2592 2593 /* 2594 * Traverse the dirlist tree and free it up. 2595 */ 2596 static void 2597 free_dir(struct dirlist *dp) 2598 { 2599 2600 if (dp) { 2601 free_dir(dp->dp_left); 2602 free_dir(dp->dp_right); 2603 free_host(dp->dp_hosts); 2604 free(dp->dp_dirp); 2605 free(dp); 2606 } 2607 } 2608 2609 /* 2610 * Parse a colon separated list of security flavors 2611 */ 2612 static int 2613 parsesec(char *seclist, struct exportlist *ep) 2614 { 2615 char *cp, savedc; 2616 int flavor; 2617 2618 ep->ex_numsecflavors = 0; 2619 for (;;) { 2620 cp = strchr(seclist, ':'); 2621 if (cp) { 2622 savedc = *cp; 2623 *cp = '\0'; 2624 } 2625 2626 if (!strcmp(seclist, "sys")) 2627 flavor = AUTH_SYS; 2628 else if (!strcmp(seclist, "krb5")) 2629 flavor = RPCSEC_GSS_KRB5; 2630 else if (!strcmp(seclist, "krb5i")) 2631 flavor = RPCSEC_GSS_KRB5I; 2632 else if (!strcmp(seclist, "krb5p")) 2633 flavor = RPCSEC_GSS_KRB5P; 2634 else { 2635 if (cp) 2636 *cp = savedc; 2637 syslog(LOG_ERR, "bad sec flavor: %s", seclist); 2638 return (1); 2639 } 2640 if (ep->ex_numsecflavors == MAXSECFLAVORS) { 2641 if (cp) 2642 *cp = savedc; 2643 syslog(LOG_ERR, "too many sec flavors: %s", seclist); 2644 return (1); 2645 } 2646 ep->ex_secflavors[ep->ex_numsecflavors] = flavor; 2647 ep->ex_numsecflavors++; 2648 if (cp) { 2649 *cp = savedc; 2650 seclist = cp + 1; 2651 } else { 2652 break; 2653 } 2654 } 2655 return (0); 2656 } 2657 2658 /* 2659 * Parse the option string and update fields. 2660 * Option arguments may either be -<option>=<value> or 2661 * -<option> <value> 2662 */ 2663 static int 2664 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp, 2665 int *has_hostp, int *exflagsp, struct xucred *cr) 2666 { 2667 char *cpoptarg, *cpoptend; 2668 char *cp, *endcp, *cpopt, savedc, savedc2; 2669 int allflag, usedarg; 2670 2671 savedc2 = '\0'; 2672 cpopt = *cpp; 2673 cpopt++; 2674 cp = *endcpp; 2675 savedc = *cp; 2676 *cp = '\0'; 2677 while (cpopt && *cpopt) { 2678 allflag = 1; 2679 usedarg = -2; 2680 if ((cpoptend = strchr(cpopt, ','))) { 2681 *cpoptend++ = '\0'; 2682 if ((cpoptarg = strchr(cpopt, '='))) 2683 *cpoptarg++ = '\0'; 2684 } else { 2685 if ((cpoptarg = strchr(cpopt, '='))) 2686 *cpoptarg++ = '\0'; 2687 else { 2688 *cp = savedc; 2689 nextfield(&cp, &endcp); 2690 **endcpp = '\0'; 2691 if (endcp > cp && *cp != '-') { 2692 cpoptarg = cp; 2693 savedc2 = *endcp; 2694 *endcp = '\0'; 2695 usedarg = 0; 2696 } 2697 } 2698 } 2699 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) { 2700 *exflagsp |= MNT_EXRDONLY; 2701 } else if (cpoptarg && (!strcmp(cpopt, "maproot") || 2702 !(allflag = strcmp(cpopt, "mapall")) || 2703 !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) { 2704 usedarg++; 2705 parsecred(cpoptarg, cr); 2706 if (allflag == 0) { 2707 *exflagsp |= MNT_EXPORTANON; 2708 opt_flags |= OP_MAPALL; 2709 } else 2710 opt_flags |= OP_MAPROOT; 2711 } else if (cpoptarg && (!strcmp(cpopt, "mask") || 2712 !strcmp(cpopt, "m"))) { 2713 if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) { 2714 syslog(LOG_ERR, "bad mask: %s", cpoptarg); 2715 return (1); 2716 } 2717 usedarg++; 2718 opt_flags |= OP_MASK; 2719 } else if (cpoptarg && (!strcmp(cpopt, "network") || 2720 !strcmp(cpopt, "n"))) { 2721 if (strchr(cpoptarg, '/') != NULL) { 2722 if (debug) 2723 fprintf(stderr, "setting OP_MASKLEN\n"); 2724 opt_flags |= OP_MASKLEN; 2725 } 2726 if (grp->gr_type != GT_NULL) { 2727 syslog(LOG_ERR, "network/host conflict"); 2728 return (1); 2729 } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) { 2730 syslog(LOG_ERR, "bad net: %s", cpoptarg); 2731 return (1); 2732 } 2733 grp->gr_type = GT_NET; 2734 *has_hostp = 1; 2735 usedarg++; 2736 opt_flags |= OP_NET; 2737 } else if (!strcmp(cpopt, "alldirs")) { 2738 opt_flags |= OP_ALLDIRS; 2739 } else if (!strcmp(cpopt, "public")) { 2740 *exflagsp |= MNT_EXPUBLIC; 2741 } else if (!strcmp(cpopt, "webnfs")) { 2742 *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON); 2743 opt_flags |= OP_MAPALL; 2744 } else if (cpoptarg && !strcmp(cpopt, "index")) { 2745 ep->ex_indexfile = strdup(cpoptarg); 2746 } else if (!strcmp(cpopt, "quiet")) { 2747 opt_flags |= OP_QUIET; 2748 } else if (cpoptarg && !strcmp(cpopt, "sec")) { 2749 if (parsesec(cpoptarg, ep)) 2750 return (1); 2751 opt_flags |= OP_SEC; 2752 usedarg++; 2753 } else { 2754 syslog(LOG_ERR, "bad opt %s", cpopt); 2755 return (1); 2756 } 2757 if (usedarg >= 0) { 2758 *endcp = savedc2; 2759 **endcpp = savedc; 2760 if (usedarg > 0) { 2761 *cpp = cp; 2762 *endcpp = endcp; 2763 } 2764 return (0); 2765 } 2766 cpopt = cpoptend; 2767 } 2768 **endcpp = savedc; 2769 return (0); 2770 } 2771 2772 /* 2773 * Translate a character string to the corresponding list of network 2774 * addresses for a hostname. 2775 */ 2776 static int 2777 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp) 2778 { 2779 struct grouplist *checkgrp; 2780 struct addrinfo *ai, *tai, hints; 2781 int ecode; 2782 char host[NI_MAXHOST]; 2783 2784 if (grp->gr_type != GT_NULL) { 2785 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp); 2786 return (1); 2787 } 2788 memset(&hints, 0, sizeof hints); 2789 hints.ai_flags = AI_CANONNAME; 2790 hints.ai_protocol = IPPROTO_UDP; 2791 ecode = getaddrinfo(cp, NULL, &hints, &ai); 2792 if (ecode != 0) { 2793 syslog(LOG_ERR,"can't get address info for host %s", cp); 2794 return 1; 2795 } 2796 grp->gr_ptr.gt_addrinfo = ai; 2797 while (ai != NULL) { 2798 if (ai->ai_canonname == NULL) { 2799 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host, 2800 sizeof host, NULL, 0, NI_NUMERICHOST) != 0) 2801 strlcpy(host, "?", sizeof(host)); 2802 ai->ai_canonname = strdup(host); 2803 ai->ai_flags |= AI_CANONNAME; 2804 } 2805 if (debug) 2806 fprintf(stderr, "got host %s\n", ai->ai_canonname); 2807 /* 2808 * Sanity check: make sure we don't already have an entry 2809 * for this host in the grouplist. 2810 */ 2811 for (checkgrp = tgrp; checkgrp != NULL; 2812 checkgrp = checkgrp->gr_next) { 2813 if (checkgrp->gr_type != GT_HOST) 2814 continue; 2815 for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL; 2816 tai = tai->ai_next) { 2817 if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0) 2818 continue; 2819 if (debug) 2820 fprintf(stderr, 2821 "ignoring duplicate host %s\n", 2822 ai->ai_canonname); 2823 grp->gr_type = GT_IGNORE; 2824 return (0); 2825 } 2826 } 2827 ai = ai->ai_next; 2828 } 2829 grp->gr_type = GT_HOST; 2830 return (0); 2831 } 2832 2833 /* 2834 * Free up an exports list component 2835 */ 2836 static void 2837 free_exp(struct exportlist *ep) 2838 { 2839 struct grouplist *grp, *tgrp; 2840 2841 if (ep->ex_defdir) { 2842 free_host(ep->ex_defdir->dp_hosts); 2843 free((caddr_t)ep->ex_defdir); 2844 } 2845 if (ep->ex_fsdir) 2846 free(ep->ex_fsdir); 2847 if (ep->ex_indexfile) 2848 free(ep->ex_indexfile); 2849 free_dir(ep->ex_dirl); 2850 grp = ep->ex_grphead; 2851 while (grp) { 2852 tgrp = grp; 2853 grp = grp->gr_next; 2854 free_grp(tgrp); 2855 } 2856 free((caddr_t)ep); 2857 } 2858 2859 /* 2860 * Free up the v4root exports. 2861 */ 2862 static void 2863 free_v4rootexp(void) 2864 { 2865 2866 if (v4root_ep != NULL) { 2867 free_exp(v4root_ep); 2868 v4root_ep = NULL; 2869 } 2870 } 2871 2872 /* 2873 * Free hosts. 2874 */ 2875 static void 2876 free_host(struct hostlist *hp) 2877 { 2878 struct hostlist *hp2; 2879 2880 while (hp) { 2881 hp2 = hp; 2882 hp = hp->ht_next; 2883 free((caddr_t)hp2); 2884 } 2885 } 2886 2887 static struct hostlist * 2888 get_ht(void) 2889 { 2890 struct hostlist *hp; 2891 2892 hp = (struct hostlist *)malloc(sizeof (struct hostlist)); 2893 if (hp == (struct hostlist *)NULL) 2894 out_of_mem(); 2895 hp->ht_next = (struct hostlist *)NULL; 2896 hp->ht_flag = 0; 2897 return (hp); 2898 } 2899 2900 /* 2901 * Out of memory, fatal 2902 */ 2903 static void 2904 out_of_mem(void) 2905 { 2906 2907 syslog(LOG_ERR, "out of memory"); 2908 exit(2); 2909 } 2910 2911 /* 2912 * Call do_mount() from the struct exportlist, for each case needed. 2913 */ 2914 static int 2915 do_export_mount(struct exportlist *ep, struct statfs *fsp) 2916 { 2917 struct grouplist *grp, defgrp; 2918 int ret; 2919 size_t dirlen; 2920 2921 LOGDEBUG("do_export_mount=%s", ep->ex_fsdir); 2922 dirlen = strlen(ep->ex_fsdir); 2923 if ((ep->ex_flag & EX_DEFSET) != 0) { 2924 defgrp.gr_type = GT_DEFAULT; 2925 defgrp.gr_next = NULL; 2926 /* We have an entry for all other hosts/nets. */ 2927 LOGDEBUG("ex_defexflags=0x%x", ep->ex_defexflags); 2928 ret = do_mount(ep, &defgrp, ep->ex_defexflags, &ep->ex_defanon, 2929 ep->ex_fsdir, dirlen, fsp, ep->ex_defnumsecflavors, 2930 ep->ex_defsecflavors); 2931 if (ret != 0) 2932 return (ret); 2933 } 2934 2935 /* Do a mount for each group. */ 2936 grp = ep->ex_grphead; 2937 while (grp != NULL) { 2938 LOGDEBUG("do mount gr_type=0x%x gr_exflags=0x%x", 2939 grp->gr_type, grp->gr_exflags); 2940 ret = do_mount(ep, grp, grp->gr_exflags, &grp->gr_anon, 2941 ep->ex_fsdir, dirlen, fsp, grp->gr_numsecflavors, 2942 grp->gr_secflavors); 2943 if (ret != 0) 2944 return (ret); 2945 grp = grp->gr_next; 2946 } 2947 return (0); 2948 } 2949 2950 /* 2951 * Do the nmount() syscall with the update flag to push the export info into 2952 * the kernel. 2953 */ 2954 static int 2955 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags, 2956 struct xucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb, 2957 int numsecflavors, int *secflavors) 2958 { 2959 struct statfs fsb1; 2960 struct addrinfo *ai; 2961 struct export_args *eap; 2962 char errmsg[255]; 2963 char *cp; 2964 int done; 2965 char savedc; 2966 struct iovec *iov; 2967 int i, iovlen; 2968 int ret; 2969 struct nfsex_args nfsea; 2970 2971 eap = &nfsea.export; 2972 2973 cp = NULL; 2974 savedc = '\0'; 2975 iov = NULL; 2976 iovlen = 0; 2977 ret = 0; 2978 2979 bzero(eap, sizeof (struct export_args)); 2980 bzero(errmsg, sizeof(errmsg)); 2981 eap->ex_flags = exflags; 2982 eap->ex_anon = *anoncrp; 2983 LOGDEBUG("do_mount exflags=0x%x", exflags); 2984 eap->ex_indexfile = ep->ex_indexfile; 2985 if (grp->gr_type == GT_HOST) 2986 ai = grp->gr_ptr.gt_addrinfo; 2987 else 2988 ai = NULL; 2989 eap->ex_numsecflavors = numsecflavors; 2990 LOGDEBUG("do_mount numsec=%d", numsecflavors); 2991 for (i = 0; i < eap->ex_numsecflavors; i++) 2992 eap->ex_secflavors[i] = secflavors[i]; 2993 if (eap->ex_numsecflavors == 0) { 2994 eap->ex_numsecflavors = 1; 2995 eap->ex_secflavors[0] = AUTH_SYS; 2996 } 2997 done = FALSE; 2998 2999 if (v4root_phase == 0) { 3000 build_iovec(&iov, &iovlen, "fstype", NULL, 0); 3001 build_iovec(&iov, &iovlen, "fspath", NULL, 0); 3002 build_iovec(&iov, &iovlen, "from", NULL, 0); 3003 build_iovec(&iov, &iovlen, "update", NULL, 0); 3004 build_iovec(&iov, &iovlen, "export", eap, 3005 sizeof (struct export_args)); 3006 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg)); 3007 } 3008 3009 while (!done) { 3010 switch (grp->gr_type) { 3011 case GT_HOST: 3012 if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0) 3013 goto skip; 3014 eap->ex_addr = ai->ai_addr; 3015 eap->ex_addrlen = ai->ai_addrlen; 3016 eap->ex_masklen = 0; 3017 break; 3018 case GT_NET: 3019 if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 && 3020 have_v6 == 0) 3021 goto skip; 3022 eap->ex_addr = 3023 (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net; 3024 eap->ex_addrlen = 3025 ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_net)->sa_len; 3026 eap->ex_mask = 3027 (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask; 3028 eap->ex_masklen = ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask)->sa_len; 3029 break; 3030 case GT_DEFAULT: 3031 eap->ex_addr = NULL; 3032 eap->ex_addrlen = 0; 3033 eap->ex_mask = NULL; 3034 eap->ex_masklen = 0; 3035 break; 3036 case GT_IGNORE: 3037 ret = 0; 3038 goto error_exit; 3039 break; 3040 default: 3041 syslog(LOG_ERR, "bad grouptype"); 3042 if (cp) 3043 *cp = savedc; 3044 ret = 1; 3045 goto error_exit; 3046 } 3047 3048 /* 3049 * For V4:, use the nfssvc() syscall, instead of mount(). 3050 */ 3051 if (v4root_phase == 2) { 3052 nfsea.fspec = v4root_dirpath; 3053 if (nfssvc(NFSSVC_V4ROOTEXPORT, (caddr_t)&nfsea) < 0) { 3054 syslog(LOG_ERR, "Exporting V4: failed"); 3055 return (2); 3056 } 3057 } else { 3058 /* 3059 * XXX: 3060 * Maybe I should just use the fsb->f_mntonname path 3061 * instead of looping back up the dirp to the mount 3062 * point?? 3063 * Also, needs to know how to export all types of local 3064 * exportable filesystems and not just "ufs". 3065 */ 3066 iov[1].iov_base = fsb->f_fstypename; /* "fstype" */ 3067 iov[1].iov_len = strlen(fsb->f_fstypename) + 1; 3068 iov[3].iov_base = fsb->f_mntonname; /* "fspath" */ 3069 iov[3].iov_len = strlen(fsb->f_mntonname) + 1; 3070 iov[5].iov_base = fsb->f_mntfromname; /* "from" */ 3071 iov[5].iov_len = strlen(fsb->f_mntfromname) + 1; 3072 errmsg[0] = '\0'; 3073 3074 while (nmount(iov, iovlen, fsb->f_flags) < 0) { 3075 if (cp) 3076 *cp-- = savedc; 3077 else 3078 cp = dirp + dirplen - 1; 3079 if (opt_flags & OP_QUIET) { 3080 ret = 1; 3081 goto error_exit; 3082 } 3083 if (errno == EPERM) { 3084 if (debug) 3085 warnx("can't change attributes for %s: %s", 3086 dirp, errmsg); 3087 syslog(LOG_ERR, 3088 "can't change attributes for %s: %s", 3089 dirp, errmsg); 3090 ret = 1; 3091 goto error_exit; 3092 } 3093 if (opt_flags & OP_ALLDIRS) { 3094 if (errno == EINVAL) 3095 syslog(LOG_ERR, 3096 "-alldirs requested but %s is not a filesystem mountpoint", 3097 dirp); 3098 else 3099 syslog(LOG_ERR, 3100 "could not remount %s: %m", 3101 dirp); 3102 ret = 1; 3103 goto error_exit; 3104 } 3105 /* back up over the last component */ 3106 while (*cp == '/' && cp > dirp) 3107 cp--; 3108 while (*(cp - 1) != '/' && cp > dirp) 3109 cp--; 3110 if (cp == dirp) { 3111 if (debug) 3112 warnx("mnt unsucc"); 3113 syslog(LOG_ERR, "can't export %s %s", 3114 dirp, errmsg); 3115 ret = 1; 3116 goto error_exit; 3117 } 3118 savedc = *cp; 3119 *cp = '\0'; 3120 /* 3121 * Check that we're still on the same 3122 * filesystem. 3123 */ 3124 if (statfs(dirp, &fsb1) != 0 || 3125 bcmp(&fsb1.f_fsid, &fsb->f_fsid, 3126 sizeof (fsb1.f_fsid)) != 0) { 3127 *cp = savedc; 3128 syslog(LOG_ERR, 3129 "can't export %s %s", dirp, 3130 errmsg); 3131 ret = 1; 3132 goto error_exit; 3133 } 3134 } 3135 } 3136 3137 /* 3138 * For the experimental server: 3139 * If this is the public directory, get the file handle 3140 * and load it into the kernel via the nfssvc() syscall. 3141 */ 3142 if ((exflags & MNT_EXPUBLIC) != 0) { 3143 fhandle_t fh; 3144 char *public_name; 3145 3146 if (eap->ex_indexfile != NULL) 3147 public_name = eap->ex_indexfile; 3148 else 3149 public_name = dirp; 3150 if (getfh(public_name, &fh) < 0) 3151 syslog(LOG_ERR, 3152 "Can't get public fh for %s", public_name); 3153 else if (nfssvc(NFSSVC_PUBLICFH, (caddr_t)&fh) < 0) 3154 syslog(LOG_ERR, 3155 "Can't set public fh for %s", public_name); 3156 else { 3157 has_publicfh = 1; 3158 has_set_publicfh = 1; 3159 ep->ex_flag |= EX_PUBLICFH; 3160 } 3161 } 3162 skip: 3163 if (ai != NULL) 3164 ai = ai->ai_next; 3165 if (ai == NULL) 3166 done = TRUE; 3167 } 3168 if (cp) 3169 *cp = savedc; 3170 error_exit: 3171 /* free strings allocated by strdup() in getmntopts.c */ 3172 if (iov != NULL) { 3173 free(iov[0].iov_base); /* fstype */ 3174 free(iov[2].iov_base); /* fspath */ 3175 free(iov[4].iov_base); /* from */ 3176 free(iov[6].iov_base); /* update */ 3177 free(iov[8].iov_base); /* export */ 3178 free(iov[10].iov_base); /* errmsg */ 3179 3180 /* free iov, allocated by realloc() */ 3181 free(iov); 3182 } 3183 return (ret); 3184 } 3185 3186 /* 3187 * Translate a net address. 3188 * 3189 * If `maskflg' is nonzero, then `cp' is a netmask, not a network address. 3190 */ 3191 static int 3192 get_net(char *cp, struct netmsk *net, int maskflg) 3193 { 3194 struct netent *np = NULL; 3195 char *name, *p, *prefp; 3196 struct sockaddr_in sin; 3197 struct sockaddr *sa = NULL; 3198 struct addrinfo hints, *ai = NULL; 3199 char netname[NI_MAXHOST]; 3200 long preflen; 3201 3202 p = prefp = NULL; 3203 if ((opt_flags & OP_MASKLEN) && !maskflg) { 3204 p = strchr(cp, '/'); 3205 *p = '\0'; 3206 prefp = p + 1; 3207 } 3208 3209 /* 3210 * Check for a numeric address first. We wish to avoid 3211 * possible DNS lookups in getnetbyname(). 3212 */ 3213 if (isxdigit(*cp) || *cp == ':') { 3214 memset(&hints, 0, sizeof hints); 3215 /* Ensure the mask and the network have the same family. */ 3216 if (maskflg && (opt_flags & OP_NET)) 3217 hints.ai_family = net->nt_net.ss_family; 3218 else if (!maskflg && (opt_flags & OP_HAVEMASK)) 3219 hints.ai_family = net->nt_mask.ss_family; 3220 else 3221 hints.ai_family = AF_UNSPEC; 3222 hints.ai_flags = AI_NUMERICHOST; 3223 if (getaddrinfo(cp, NULL, &hints, &ai) == 0) 3224 sa = ai->ai_addr; 3225 if (sa != NULL && ai->ai_family == AF_INET) { 3226 /* 3227 * The address in `cp' is really a network address, so 3228 * use inet_network() to re-interpret this correctly. 3229 * e.g. "127.1" means 127.1.0.0, not 127.0.0.1. 3230 */ 3231 bzero(&sin, sizeof sin); 3232 sin.sin_family = AF_INET; 3233 sin.sin_len = sizeof sin; 3234 sin.sin_addr = inet_makeaddr(inet_network(cp), 0); 3235 if (debug) 3236 fprintf(stderr, "get_net: v4 addr %s\n", 3237 inet_ntoa(sin.sin_addr)); 3238 sa = (struct sockaddr *)&sin; 3239 } 3240 } 3241 if (sa == NULL && (np = getnetbyname(cp)) != NULL) { 3242 bzero(&sin, sizeof sin); 3243 sin.sin_family = AF_INET; 3244 sin.sin_len = sizeof sin; 3245 sin.sin_addr = inet_makeaddr(np->n_net, 0); 3246 sa = (struct sockaddr *)&sin; 3247 } 3248 if (sa == NULL) 3249 goto fail; 3250 3251 if (maskflg) { 3252 /* The specified sockaddr is a mask. */ 3253 if (checkmask(sa) != 0) 3254 goto fail; 3255 bcopy(sa, &net->nt_mask, sa->sa_len); 3256 opt_flags |= OP_HAVEMASK; 3257 } else { 3258 /* The specified sockaddr is a network address. */ 3259 bcopy(sa, &net->nt_net, sa->sa_len); 3260 3261 /* Get a network name for the export list. */ 3262 if (np) { 3263 name = np->n_name; 3264 } else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname, 3265 NULL, 0, NI_NUMERICHOST) == 0) { 3266 name = netname; 3267 } else { 3268 goto fail; 3269 } 3270 if ((net->nt_name = strdup(name)) == NULL) 3271 out_of_mem(); 3272 3273 /* 3274 * Extract a mask from either a "/<masklen>" suffix, or 3275 * from the class of an IPv4 address. 3276 */ 3277 if (opt_flags & OP_MASKLEN) { 3278 preflen = strtol(prefp, NULL, 10); 3279 if (preflen < 0L || preflen == LONG_MAX) 3280 goto fail; 3281 bcopy(sa, &net->nt_mask, sa->sa_len); 3282 if (makemask(&net->nt_mask, (int)preflen) != 0) 3283 goto fail; 3284 opt_flags |= OP_HAVEMASK; 3285 *p = '/'; 3286 } else if (sa->sa_family == AF_INET && 3287 (opt_flags & OP_MASK) == 0) { 3288 in_addr_t addr; 3289 3290 addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr; 3291 if (IN_CLASSA(addr)) 3292 preflen = 8; 3293 else if (IN_CLASSB(addr)) 3294 preflen = 16; 3295 else if (IN_CLASSC(addr)) 3296 preflen = 24; 3297 else if (IN_CLASSD(addr)) 3298 preflen = 28; 3299 else 3300 preflen = 32; /* XXX */ 3301 3302 bcopy(sa, &net->nt_mask, sa->sa_len); 3303 makemask(&net->nt_mask, (int)preflen); 3304 opt_flags |= OP_HAVEMASK; 3305 } 3306 } 3307 3308 if (ai) 3309 freeaddrinfo(ai); 3310 return 0; 3311 3312 fail: 3313 if (ai) 3314 freeaddrinfo(ai); 3315 return 1; 3316 } 3317 3318 /* 3319 * Parse out the next white space separated field 3320 */ 3321 static void 3322 nextfield(char **cp, char **endcp) 3323 { 3324 char *p; 3325 char quot = 0; 3326 3327 p = *cp; 3328 while (*p == ' ' || *p == '\t') 3329 p++; 3330 *cp = p; 3331 while (*p != '\0') { 3332 if (quot) { 3333 if (*p == quot) 3334 quot = 0; 3335 } else { 3336 if (*p == '\\' && *(p + 1) != '\0') 3337 p++; 3338 else if (*p == '\'' || *p == '"') 3339 quot = *p; 3340 else if (*p == ' ' || *p == '\t') 3341 break; 3342 } 3343 p++; 3344 }; 3345 *endcp = p; 3346 } 3347 3348 /* 3349 * Get an exports file line. Skip over blank lines and handle line 3350 * continuations. 3351 */ 3352 static int 3353 get_line(void) 3354 { 3355 char *p, *cp; 3356 size_t len; 3357 int totlen, cont_line; 3358 3359 /* 3360 * Loop around ignoring blank lines and getting all continuation lines. 3361 */ 3362 p = line; 3363 totlen = 0; 3364 do { 3365 if ((p = fgetln(exp_file, &len)) == NULL) 3366 return (0); 3367 cp = p + len - 1; 3368 cont_line = 0; 3369 while (cp >= p && 3370 (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) { 3371 if (*cp == '\\') 3372 cont_line = 1; 3373 cp--; 3374 len--; 3375 } 3376 if (cont_line) { 3377 *++cp = ' '; 3378 len++; 3379 } 3380 if (linesize < len + totlen + 1) { 3381 linesize = len + totlen + 1; 3382 line = realloc(line, linesize); 3383 if (line == NULL) 3384 out_of_mem(); 3385 } 3386 memcpy(line + totlen, p, len); 3387 totlen += len; 3388 line[totlen] = '\0'; 3389 } while (totlen == 0 || cont_line); 3390 return (1); 3391 } 3392 3393 /* 3394 * Parse a description of a credential. 3395 */ 3396 static void 3397 parsecred(char *namelist, struct xucred *cr) 3398 { 3399 char *name; 3400 int cnt; 3401 char *names; 3402 struct passwd *pw; 3403 struct group *gr; 3404 gid_t groups[XU_NGROUPS + 1]; 3405 int ngroups; 3406 3407 cr->cr_version = XUCRED_VERSION; 3408 /* 3409 * Set up the unprivileged user. 3410 */ 3411 cr->cr_uid = 65534; 3412 cr->cr_groups[0] = 65533; 3413 cr->cr_ngroups = 1; 3414 /* 3415 * Get the user's password table entry. 3416 */ 3417 names = namelist; 3418 name = strsep_quote(&names, ":"); 3419 /* Bug? name could be NULL here */ 3420 if (isdigit(*name) || *name == '-') 3421 pw = getpwuid(atoi(name)); 3422 else 3423 pw = getpwnam(name); 3424 /* 3425 * Credentials specified as those of a user. 3426 */ 3427 if (names == NULL) { 3428 if (pw == NULL) { 3429 syslog(LOG_ERR, "unknown user: %s", name); 3430 return; 3431 } 3432 cr->cr_uid = pw->pw_uid; 3433 ngroups = XU_NGROUPS + 1; 3434 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups)) { 3435 syslog(LOG_ERR, "too many groups"); 3436 ngroups = XU_NGROUPS + 1; 3437 } 3438 3439 /* 3440 * Compress out duplicate. 3441 */ 3442 cr->cr_ngroups = ngroups - 1; 3443 cr->cr_groups[0] = groups[0]; 3444 for (cnt = 2; cnt < ngroups; cnt++) 3445 cr->cr_groups[cnt - 1] = groups[cnt]; 3446 return; 3447 } 3448 /* 3449 * Explicit credential specified as a colon separated list: 3450 * uid:gid:gid:... 3451 */ 3452 if (pw != NULL) 3453 cr->cr_uid = pw->pw_uid; 3454 else if (isdigit(*name) || *name == '-') 3455 cr->cr_uid = atoi(name); 3456 else { 3457 syslog(LOG_ERR, "unknown user: %s", name); 3458 return; 3459 } 3460 cr->cr_ngroups = 0; 3461 while (names != NULL && *names != '\0' && cr->cr_ngroups < XU_NGROUPS) { 3462 name = strsep_quote(&names, ":"); 3463 if (isdigit(*name) || *name == '-') { 3464 cr->cr_groups[cr->cr_ngroups++] = atoi(name); 3465 } else { 3466 if ((gr = getgrnam(name)) == NULL) { 3467 syslog(LOG_ERR, "unknown group: %s", name); 3468 continue; 3469 } 3470 cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid; 3471 } 3472 } 3473 if (names != NULL && *names != '\0' && cr->cr_ngroups == XU_NGROUPS) 3474 syslog(LOG_ERR, "too many groups"); 3475 } 3476 3477 #define STRSIZ (MNTNAMLEN+MNTPATHLEN+50) 3478 /* 3479 * Routines that maintain the remote mounttab 3480 */ 3481 static void 3482 get_mountlist(void) 3483 { 3484 struct mountlist *mlp; 3485 char *host, *dirp, *cp; 3486 char str[STRSIZ]; 3487 FILE *mlfile; 3488 3489 if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) { 3490 if (errno == ENOENT) 3491 return; 3492 else { 3493 syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST); 3494 return; 3495 } 3496 } 3497 while (fgets(str, STRSIZ, mlfile) != NULL) { 3498 cp = str; 3499 host = strsep(&cp, " \t\n"); 3500 dirp = strsep(&cp, " \t\n"); 3501 if (host == NULL || dirp == NULL) 3502 continue; 3503 mlp = (struct mountlist *)malloc(sizeof (*mlp)); 3504 if (mlp == (struct mountlist *)NULL) 3505 out_of_mem(); 3506 strncpy(mlp->ml_host, host, MNTNAMLEN); 3507 mlp->ml_host[MNTNAMLEN] = '\0'; 3508 strncpy(mlp->ml_dirp, dirp, MNTPATHLEN); 3509 mlp->ml_dirp[MNTPATHLEN] = '\0'; 3510 3511 SLIST_INSERT_HEAD(&mlhead, mlp, next); 3512 } 3513 fclose(mlfile); 3514 } 3515 3516 static void 3517 del_mlist(char *hostp, char *dirp) 3518 { 3519 struct mountlist *mlp, *mlp2; 3520 FILE *mlfile; 3521 int fnd = 0; 3522 3523 SLIST_FOREACH_SAFE(mlp, &mlhead, next, mlp2) { 3524 if (!strcmp(mlp->ml_host, hostp) && 3525 (!dirp || !strcmp(mlp->ml_dirp, dirp))) { 3526 fnd = 1; 3527 SLIST_REMOVE(&mlhead, mlp, mountlist, next); 3528 free((caddr_t)mlp); 3529 } 3530 } 3531 if (fnd) { 3532 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) { 3533 syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST); 3534 return; 3535 } 3536 SLIST_FOREACH(mlp, &mlhead, next) { 3537 fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp); 3538 } 3539 fclose(mlfile); 3540 } 3541 } 3542 3543 static void 3544 add_mlist(char *hostp, char *dirp) 3545 { 3546 struct mountlist *mlp; 3547 FILE *mlfile; 3548 3549 SLIST_FOREACH(mlp, &mlhead, next) { 3550 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp)) 3551 return; 3552 } 3553 3554 mlp = (struct mountlist *)malloc(sizeof (*mlp)); 3555 if (mlp == (struct mountlist *)NULL) 3556 out_of_mem(); 3557 strncpy(mlp->ml_host, hostp, MNTNAMLEN); 3558 mlp->ml_host[MNTNAMLEN] = '\0'; 3559 strncpy(mlp->ml_dirp, dirp, MNTPATHLEN); 3560 mlp->ml_dirp[MNTPATHLEN] = '\0'; 3561 SLIST_INSERT_HEAD(&mlhead, mlp, next); 3562 if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) { 3563 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST); 3564 return; 3565 } 3566 fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp); 3567 fclose(mlfile); 3568 } 3569 3570 /* 3571 * Free up a group list. 3572 */ 3573 static void 3574 free_grp(struct grouplist *grp) 3575 { 3576 if (grp->gr_type == GT_HOST) { 3577 if (grp->gr_ptr.gt_addrinfo != NULL) 3578 freeaddrinfo(grp->gr_ptr.gt_addrinfo); 3579 } else if (grp->gr_type == GT_NET) { 3580 if (grp->gr_ptr.gt_net.nt_name) 3581 free(grp->gr_ptr.gt_net.nt_name); 3582 } 3583 free((caddr_t)grp); 3584 } 3585 3586 #ifdef DEBUG 3587 static void 3588 SYSLOG(int pri, const char *fmt, ...) 3589 { 3590 va_list ap; 3591 3592 va_start(ap, fmt); 3593 vfprintf(stderr, fmt, ap); 3594 va_end(ap); 3595 } 3596 #endif /* DEBUG */ 3597 3598 /* 3599 * Check options for consistency. 3600 */ 3601 static int 3602 check_options(struct dirlist *dp) 3603 { 3604 3605 if (v4root_phase == 0 && dp == NULL) 3606 return (1); 3607 if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL)) { 3608 syslog(LOG_ERR, "-mapall and -maproot mutually exclusive"); 3609 return (1); 3610 } 3611 if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) { 3612 syslog(LOG_ERR, "-mask requires -network"); 3613 return (1); 3614 } 3615 if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) { 3616 syslog(LOG_ERR, "-network requires mask specification"); 3617 return (1); 3618 } 3619 if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) { 3620 syslog(LOG_ERR, "-mask and /masklen are mutually exclusive"); 3621 return (1); 3622 } 3623 if (v4root_phase > 0 && 3624 (opt_flags & 3625 ~(OP_SEC | OP_MASK | OP_NET | OP_HAVEMASK | OP_MASKLEN)) != 0) { 3626 syslog(LOG_ERR,"only -sec,-net,-mask options allowed on V4:"); 3627 return (1); 3628 } 3629 if ((opt_flags & OP_ALLDIRS) && dp->dp_left) { 3630 syslog(LOG_ERR, "-alldirs has multiple directories"); 3631 return (1); 3632 } 3633 return (0); 3634 } 3635 3636 /* 3637 * Check an absolute directory path for any symbolic links. Return true 3638 */ 3639 static int 3640 check_dirpath(char *dirp) 3641 { 3642 char *cp; 3643 int ret = 1; 3644 struct stat sb; 3645 3646 cp = dirp + 1; 3647 while (*cp && ret) { 3648 if (*cp == '/') { 3649 *cp = '\0'; 3650 if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode)) 3651 ret = 0; 3652 *cp = '/'; 3653 } 3654 cp++; 3655 } 3656 if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode)) 3657 ret = 0; 3658 return (ret); 3659 } 3660 3661 /* 3662 * Make a netmask according to the specified prefix length. The ss_family 3663 * and other non-address fields must be initialised before calling this. 3664 */ 3665 static int 3666 makemask(struct sockaddr_storage *ssp, int bitlen) 3667 { 3668 u_char *p; 3669 int bits, i, len; 3670 3671 if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL) 3672 return (-1); 3673 if (bitlen > len * CHAR_BIT) 3674 return (-1); 3675 3676 for (i = 0; i < len; i++) { 3677 bits = MIN(CHAR_BIT, bitlen); 3678 *p++ = (u_char)~0 << (CHAR_BIT - bits); 3679 bitlen -= bits; 3680 } 3681 return 0; 3682 } 3683 3684 /* 3685 * Check that the sockaddr is a valid netmask. Returns 0 if the mask 3686 * is acceptable (i.e. of the form 1...10....0). 3687 */ 3688 static int 3689 checkmask(struct sockaddr *sa) 3690 { 3691 u_char *mask; 3692 int i, len; 3693 3694 if ((mask = sa_rawaddr(sa, &len)) == NULL) 3695 return (-1); 3696 3697 for (i = 0; i < len; i++) 3698 if (mask[i] != 0xff) 3699 break; 3700 if (i < len) { 3701 if (~mask[i] & (u_char)(~mask[i] + 1)) 3702 return (-1); 3703 i++; 3704 } 3705 for (; i < len; i++) 3706 if (mask[i] != 0) 3707 return (-1); 3708 return (0); 3709 } 3710 3711 /* 3712 * Compare two sockaddrs according to a specified mask. Return zero if 3713 * `sa1' matches `sa2' when filtered by the netmask in `samask'. 3714 * If samask is NULL, perform a full comparison. 3715 */ 3716 static int 3717 sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask) 3718 { 3719 unsigned char *p1, *p2, *mask; 3720 int len, i; 3721 3722 if (sa1->sa_family != sa2->sa_family || 3723 (p1 = sa_rawaddr(sa1, &len)) == NULL || 3724 (p2 = sa_rawaddr(sa2, NULL)) == NULL) 3725 return (1); 3726 3727 switch (sa1->sa_family) { 3728 case AF_INET6: 3729 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id != 3730 ((struct sockaddr_in6 *)sa2)->sin6_scope_id) 3731 return (1); 3732 break; 3733 } 3734 3735 /* Simple binary comparison if no mask specified. */ 3736 if (samask == NULL) 3737 return (memcmp(p1, p2, len)); 3738 3739 /* Set up the mask, and do a mask-based comparison. */ 3740 if (sa1->sa_family != samask->sa_family || 3741 (mask = sa_rawaddr(samask, NULL)) == NULL) 3742 return (1); 3743 3744 for (i = 0; i < len; i++) 3745 if ((p1[i] & mask[i]) != (p2[i] & mask[i])) 3746 return (1); 3747 return (0); 3748 } 3749 3750 /* 3751 * Return a pointer to the part of the sockaddr that contains the 3752 * raw address, and set *nbytes to its length in bytes. Returns 3753 * NULL if the address family is unknown. 3754 */ 3755 static void * 3756 sa_rawaddr(struct sockaddr *sa, int *nbytes) { 3757 void *p; 3758 int len; 3759 3760 switch (sa->sa_family) { 3761 case AF_INET: 3762 len = sizeof(((struct sockaddr_in *)sa)->sin_addr); 3763 p = &((struct sockaddr_in *)sa)->sin_addr; 3764 break; 3765 case AF_INET6: 3766 len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr); 3767 p = &((struct sockaddr_in6 *)sa)->sin6_addr; 3768 break; 3769 default: 3770 p = NULL; 3771 len = 0; 3772 } 3773 3774 if (nbytes != NULL) 3775 *nbytes = len; 3776 return (p); 3777 } 3778 3779 static void 3780 huphandler(int sig __unused) 3781 { 3782 3783 got_sighup = 1; 3784 } 3785 3786 static void 3787 terminate(int sig __unused) 3788 { 3789 pidfile_remove(pfh); 3790 rpcb_unset(MOUNTPROG, MOUNTVERS, NULL); 3791 rpcb_unset(MOUNTPROG, MOUNTVERS3, NULL); 3792 exit (0); 3793 } 3794