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/conf.h> 52 #include <sys/fcntl.h> 53 #include <sys/fnv_hash.h> 54 #include <sys/linker.h> 55 #include <sys/module.h> 56 #include <sys/mount.h> 57 #include <sys/queue.h> 58 #include <sys/stat.h> 59 #include <sys/sysctl.h> 60 #include <sys/syslog.h> 61 62 #include <rpc/rpc.h> 63 #include <rpc/rpc_com.h> 64 #include <rpc/pmap_clnt.h> 65 #include <rpc/pmap_prot.h> 66 #include <rpcsvc/mount.h> 67 #include <nfs/nfsproto.h> 68 #include <nfs/nfssvc.h> 69 #include <nfsserver/nfs.h> 70 71 #include <fs/nfs/nfsport.h> 72 73 #include <arpa/inet.h> 74 75 #include <ctype.h> 76 #include <err.h> 77 #include <errno.h> 78 #include <grp.h> 79 #include <libutil.h> 80 #include <limits.h> 81 #include <netdb.h> 82 #include <pwd.h> 83 #include <signal.h> 84 #include <stdio.h> 85 #include <stdlib.h> 86 #include <string.h> 87 #include <unistd.h> 88 #include "pathnames.h" 89 #include "mntopts.h" 90 91 #ifdef DEBUG 92 #include <stdarg.h> 93 #endif 94 95 /* 96 * Structures for keeping the mount list and export list 97 */ 98 struct mountlist { 99 char ml_host[MNTNAMLEN+1]; 100 char ml_dirp[MNTPATHLEN+1]; 101 102 SLIST_ENTRY(mountlist) next; 103 }; 104 105 struct dirlist { 106 struct dirlist *dp_left; 107 struct dirlist *dp_right; 108 int dp_flag; 109 struct hostlist *dp_hosts; /* List of hosts this dir exported to */ 110 char *dp_dirp; 111 }; 112 /* dp_flag bits */ 113 #define DP_DEFSET 0x1 114 #define DP_HOSTSET 0x2 115 116 /* 117 * maproot/mapall credentials. 118 */ 119 struct expcred { 120 uid_t cr_uid; 121 int cr_ngroups; 122 gid_t cr_groups[NGROUPS_MAX + 1]; 123 }; 124 125 struct exportlist { 126 struct dirlist *ex_dirl; 127 struct dirlist *ex_defdir; 128 struct grouplist *ex_grphead; 129 int ex_flag; 130 fsid_t ex_fs; 131 char *ex_fsdir; 132 char *ex_indexfile; 133 struct expcred ex_defanon; 134 uint64_t ex_defexflags; 135 int ex_numsecflavors; 136 int ex_secflavors[MAXSECFLAVORS]; 137 int ex_defnumsecflavors; 138 int ex_defsecflavors[MAXSECFLAVORS]; 139 140 SLIST_ENTRY(exportlist) entries; 141 }; 142 /* ex_flag bits */ 143 #define EX_LINKED 0x1 144 #define EX_DONE 0x2 145 #define EX_DEFSET 0x4 146 #define EX_PUBLICFH 0x8 147 148 SLIST_HEAD(exportlisthead, exportlist); 149 150 struct netmsk { 151 struct sockaddr_storage nt_net; 152 struct sockaddr_storage nt_mask; 153 char *nt_name; 154 }; 155 156 union grouptypes { 157 struct addrinfo *gt_addrinfo; 158 struct netmsk gt_net; 159 }; 160 161 struct grouplist { 162 int gr_type; 163 union grouptypes gr_ptr; 164 struct grouplist *gr_next; 165 struct expcred gr_anon; 166 uint64_t gr_exflags; 167 int gr_flag; 168 int gr_numsecflavors; 169 int gr_secflavors[MAXSECFLAVORS]; 170 }; 171 /* Group types */ 172 #define GT_NULL 0x0 173 #define GT_HOST 0x1 174 #define GT_NET 0x2 175 #define GT_DEFAULT 0x3 176 #define GT_IGNORE 0x5 177 178 /* Group flags */ 179 #define GR_FND 0x1 180 181 struct hostlist { 182 int ht_flag; /* Uses DP_xx bits */ 183 struct grouplist *ht_grp; 184 struct hostlist *ht_next; 185 }; 186 187 struct fhreturn { 188 int fhr_flag; 189 int fhr_vers; 190 nfsfh_t fhr_fh; 191 int fhr_numsecflavors; 192 int *fhr_secflavors; 193 }; 194 195 #define GETPORT_MAXTRY 20 /* Max tries to get a port # */ 196 197 /* 198 * How long to delay a reload of exports when there are RPC request(s) 199 * to process, in usec. Must be less than 1second. 200 */ 201 #define RELOADDELAY 250000 202 203 /* Global defs */ 204 static char *add_expdir(struct dirlist **, char *, int); 205 static void add_dlist(struct dirlist **, struct dirlist *, 206 struct grouplist *, int, struct exportlist *, 207 struct expcred *, uint64_t); 208 static void add_mlist(char *, char *); 209 static int check_dirpath(char *); 210 static int check_options(struct dirlist *); 211 static int checkmask(struct sockaddr *sa); 212 static int chk_host(struct dirlist *, struct sockaddr *, int *, int *, 213 int *, int **); 214 static char *strsep_quote(char **stringp, const char *delim); 215 static int create_service(struct netconfig *nconf); 216 static void complete_service(struct netconfig *nconf, char *port_str); 217 static void clearout_service(void); 218 static void del_mlist(char *hostp, char *dirp); 219 static struct dirlist *dirp_search(struct dirlist *, char *); 220 static int do_export_mount(struct exportlist *, struct statfs *); 221 static int do_mount(struct exportlist *, struct grouplist *, uint64_t, 222 struct expcred *, char *, int, struct statfs *, int, int *); 223 static int do_opt(char **, char **, struct exportlist *, 224 struct grouplist *, int *, uint64_t *, struct expcred *); 225 static struct exportlist *ex_search(fsid_t *, struct exportlisthead *); 226 static struct exportlist *get_exp(void); 227 static void free_dir(struct dirlist *); 228 static void free_exp(struct exportlist *); 229 static void free_grp(struct grouplist *); 230 static void free_host(struct hostlist *); 231 static void free_v4rootexp(void); 232 static void get_exportlist_one(int); 233 static void get_exportlist(int); 234 static void insert_exports(struct exportlist *, struct exportlisthead *); 235 static void free_exports(struct exportlisthead *); 236 static void read_exportfile(int); 237 static int compare_nmount_exportlist(struct iovec *, int, char *); 238 static int compare_export(struct exportlist *, struct exportlist *); 239 static int compare_cred(struct expcred *, struct expcred *); 240 static int compare_secflavor(int *, int *, int); 241 static void delete_export(struct iovec *, int, struct statfs *, char *); 242 static int get_host(char *, struct grouplist *, struct grouplist *); 243 static struct hostlist *get_ht(void); 244 static int get_line(void); 245 static void get_mountlist(void); 246 static int get_net(char *, struct netmsk *, int); 247 static void getexp_err(struct exportlist *, struct grouplist *, const char *); 248 static struct grouplist *get_grp(void); 249 static void hang_dirp(struct dirlist *, struct grouplist *, 250 struct exportlist *, int, struct expcred *, uint64_t); 251 static void huphandler(int sig); 252 static int makemask(struct sockaddr_storage *ssp, int bitlen); 253 static void mntsrv(struct svc_req *, SVCXPRT *); 254 static void nextfield(char **, char **); 255 static void out_of_mem(void); 256 static void parsecred(char *, struct expcred *); 257 static int parsesec(char *, struct exportlist *); 258 static int put_exlist(struct dirlist *, XDR *, struct dirlist *, 259 int *, int); 260 static void *sa_rawaddr(struct sockaddr *sa, int *nbytes); 261 static int sacmp(struct sockaddr *sa1, struct sockaddr *sa2, 262 struct sockaddr *samask); 263 static int scan_tree(struct dirlist *, struct sockaddr *); 264 static void usage(void); 265 static int xdr_dir(XDR *, char *); 266 static int xdr_explist(XDR *, caddr_t); 267 static int xdr_explist_brief(XDR *, caddr_t); 268 static int xdr_explist_common(XDR *, caddr_t, int); 269 static int xdr_fhs(XDR *, caddr_t); 270 static int xdr_mlist(XDR *, caddr_t); 271 static void terminate(int); 272 static void cp_cred(struct expcred *, struct expcred *); 273 274 #define EXPHASH(f) (fnv_32_buf((f), sizeof(fsid_t), 0) % exphashsize) 275 static struct exportlisthead *exphead = NULL; 276 static struct exportlisthead *oldexphead = NULL; 277 static int exphashsize = 0; 278 static SLIST_HEAD(, mountlist) mlhead = SLIST_HEAD_INITIALIZER(&mlhead); 279 static char *exnames_default[2] = { _PATH_EXPORTS, NULL }; 280 static char **exnames; 281 static char **hosts = NULL; 282 static int force_v2 = 0; 283 static int resvport_only = 1; 284 static int nhosts = 0; 285 static int dir_only = 1; 286 static int dolog = 0; 287 static int got_sighup = 0; 288 static int xcreated = 0; 289 290 static char *svcport_str = NULL; 291 static int mallocd_svcport = 0; 292 static int *sock_fd; 293 static int sock_fdcnt; 294 static int sock_fdpos; 295 static int suspend_nfsd = 0; 296 297 static int opt_flags; 298 static int have_v6 = 1; 299 300 static int v4root_phase = 0; 301 static char v4root_dirpath[PATH_MAX + 1]; 302 static struct exportlist *v4root_ep = NULL; 303 static int has_publicfh = 0; 304 static int has_set_publicfh = 0; 305 306 static struct pidfh *pfh = NULL; 307 /* Bits for opt_flags above */ 308 #define OP_MAPROOT 0x01 309 #define OP_MAPALL 0x02 310 /* 0x4 free */ 311 #define OP_MASK 0x08 312 #define OP_NET 0x10 313 #define OP_ALLDIRS 0x40 314 #define OP_HAVEMASK 0x80 /* A mask was specified or inferred. */ 315 #define OP_QUIET 0x100 316 #define OP_MASKLEN 0x200 317 #define OP_SEC 0x400 318 319 #ifdef DEBUG 320 static int debug = 1; 321 static void SYSLOG(int, const char *, ...) __printflike(2, 3); 322 #define syslog SYSLOG 323 #else 324 static int debug = 0; 325 #endif 326 327 /* 328 * The LOGDEBUG() syslog() calls are always compiled into the daemon. 329 * To enable them, create a file at _PATH_MOUNTDDEBUG. This file can be empty. 330 * To disable the logging, just delete the file at _PATH_MOUNTDDEBUG. 331 */ 332 static int logdebug = 0; 333 #define LOGDEBUG(format, ...) \ 334 (logdebug ? syslog(LOG_DEBUG, format, ## __VA_ARGS__) : 0) 335 336 /* 337 * Similar to strsep(), but it allows for quoted strings 338 * and escaped characters. 339 * 340 * It returns the string (or NULL, if *stringp is NULL), 341 * which is a de-quoted version of the string if necessary. 342 * 343 * It modifies *stringp in place. 344 */ 345 static char * 346 strsep_quote(char **stringp, const char *delim) 347 { 348 char *srcptr, *dstptr, *retval; 349 char quot = 0; 350 351 if (stringp == NULL || *stringp == NULL) 352 return (NULL); 353 354 srcptr = dstptr = retval = *stringp; 355 356 while (*srcptr) { 357 /* 358 * We're looking for several edge cases here. 359 * First: if we're in quote state (quot != 0), 360 * then we ignore the delim characters, but otherwise 361 * process as normal, unless it is the quote character. 362 * Second: if the current character is a backslash, 363 * we take the next character as-is, without checking 364 * for delim, quote, or backslash. Exception: if the 365 * next character is a NUL, that's the end of the string. 366 * Third: if the character is a quote character, we toggle 367 * quote state. 368 * Otherwise: check the current character for NUL, or 369 * being in delim, and end the string if either is true. 370 */ 371 if (*srcptr == '\\') { 372 srcptr++; 373 /* 374 * The edge case here is if the next character 375 * is NUL, we want to stop processing. But if 376 * it's not NUL, then we simply want to copy it. 377 */ 378 if (*srcptr) { 379 *dstptr++ = *srcptr++; 380 } 381 continue; 382 } 383 if (quot == 0 && (*srcptr == '\'' || *srcptr == '"')) { 384 quot = *srcptr++; 385 continue; 386 } 387 if (quot && *srcptr == quot) { 388 /* End of the quoted part */ 389 quot = 0; 390 srcptr++; 391 continue; 392 } 393 if (!quot && strchr(delim, *srcptr)) 394 break; 395 *dstptr++ = *srcptr++; 396 } 397 398 *stringp = (*srcptr == '\0') ? NULL : srcptr + 1; 399 *dstptr = 0; /* Terminate the string */ 400 return (retval); 401 } 402 403 /* 404 * Mountd server for NFS mount protocol as described in: 405 * NFS: Network File System Protocol Specification, RFC1094, Appendix A 406 * The optional arguments are the exports file name 407 * default: _PATH_EXPORTS 408 * and "-n" to allow nonroot mount. 409 */ 410 int 411 main(int argc, char **argv) 412 { 413 fd_set readfds; 414 struct netconfig *nconf; 415 char *endptr, **hosts_bak; 416 void *nc_handle; 417 pid_t otherpid; 418 in_port_t svcport; 419 int c, k, s; 420 int maxrec = RPC_MAXDATASIZE; 421 int attempt_cnt, port_len, port_pos, ret; 422 char **port_list; 423 uint64_t curtime, nexttime; 424 struct timeval tv; 425 struct timespec tp; 426 sigset_t sighup_mask; 427 428 /* Check that another mountd isn't already running. */ 429 pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &otherpid); 430 if (pfh == NULL) { 431 if (errno == EEXIST) 432 errx(1, "mountd already running, pid: %d.", otherpid); 433 warn("cannot open or create pidfile"); 434 } 435 436 s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP); 437 if (s < 0) 438 have_v6 = 0; 439 else 440 close(s); 441 442 while ((c = getopt(argc, argv, "2deh:lnp:rS")) != -1) 443 switch (c) { 444 case '2': 445 force_v2 = 1; 446 break; 447 case 'e': 448 /* now a no-op, since this is the default */ 449 break; 450 case 'n': 451 resvport_only = 0; 452 break; 453 case 'r': 454 dir_only = 0; 455 break; 456 case 'd': 457 debug = debug ? 0 : 1; 458 break; 459 case 'l': 460 dolog = 1; 461 break; 462 case 'p': 463 endptr = NULL; 464 svcport = (in_port_t)strtoul(optarg, &endptr, 10); 465 if (endptr == NULL || *endptr != '\0' || 466 svcport == 0 || svcport >= IPPORT_MAX) 467 usage(); 468 svcport_str = strdup(optarg); 469 break; 470 case 'h': 471 ++nhosts; 472 hosts_bak = hosts; 473 hosts_bak = realloc(hosts, nhosts * sizeof(char *)); 474 if (hosts_bak == NULL) { 475 if (hosts != NULL) { 476 for (k = 0; k < nhosts; k++) 477 free(hosts[k]); 478 free(hosts); 479 out_of_mem(); 480 } 481 } 482 hosts = hosts_bak; 483 hosts[nhosts - 1] = strdup(optarg); 484 if (hosts[nhosts - 1] == NULL) { 485 for (k = 0; k < (nhosts - 1); k++) 486 free(hosts[k]); 487 free(hosts); 488 out_of_mem(); 489 } 490 break; 491 case 'S': 492 suspend_nfsd = 1; 493 break; 494 default: 495 usage(); 496 } 497 498 if (modfind("nfsd") < 0) { 499 /* Not present in kernel, try loading it */ 500 if (kldload("nfsd") < 0 || modfind("nfsd") < 0) 501 errx(1, "NFS server is not available"); 502 } 503 504 argc -= optind; 505 argv += optind; 506 if (argc > 0) 507 exnames = argv; 508 else 509 exnames = exnames_default; 510 openlog("mountd", LOG_PID, LOG_DAEMON); 511 if (debug) 512 warnx("getting export list"); 513 get_exportlist(0); 514 if (debug) 515 warnx("getting mount list"); 516 get_mountlist(); 517 if (debug) 518 warnx("here we go"); 519 if (debug == 0) { 520 daemon(0, 0); 521 signal(SIGINT, SIG_IGN); 522 signal(SIGQUIT, SIG_IGN); 523 } 524 signal(SIGHUP, huphandler); 525 signal(SIGTERM, terminate); 526 signal(SIGPIPE, SIG_IGN); 527 528 pidfile_write(pfh); 529 530 rpcb_unset(MOUNTPROG, MOUNTVERS, NULL); 531 rpcb_unset(MOUNTPROG, MOUNTVERS3, NULL); 532 rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec); 533 534 if (!resvport_only) { 535 if (sysctlbyname("vfs.nfsd.nfs_privport", NULL, NULL, 536 &resvport_only, sizeof(resvport_only)) != 0 && 537 errno != ENOENT) { 538 syslog(LOG_ERR, "sysctl: %m"); 539 exit(1); 540 } 541 } 542 543 /* 544 * If no hosts were specified, add a wildcard entry to bind to 545 * INADDR_ANY. Otherwise make sure 127.0.0.1 and ::1 are added to the 546 * list. 547 */ 548 if (nhosts == 0) { 549 hosts = malloc(sizeof(char *)); 550 if (hosts == NULL) 551 out_of_mem(); 552 hosts[0] = "*"; 553 nhosts = 1; 554 } else { 555 hosts_bak = hosts; 556 if (have_v6) { 557 hosts_bak = realloc(hosts, (nhosts + 2) * 558 sizeof(char *)); 559 if (hosts_bak == NULL) { 560 for (k = 0; k < nhosts; k++) 561 free(hosts[k]); 562 free(hosts); 563 out_of_mem(); 564 } else 565 hosts = hosts_bak; 566 nhosts += 2; 567 hosts[nhosts - 2] = "::1"; 568 } else { 569 hosts_bak = realloc(hosts, (nhosts + 1) * sizeof(char *)); 570 if (hosts_bak == NULL) { 571 for (k = 0; k < nhosts; k++) 572 free(hosts[k]); 573 free(hosts); 574 out_of_mem(); 575 } else { 576 nhosts += 1; 577 hosts = hosts_bak; 578 } 579 } 580 581 hosts[nhosts - 1] = "127.0.0.1"; 582 } 583 584 attempt_cnt = 1; 585 sock_fdcnt = 0; 586 sock_fd = NULL; 587 port_list = NULL; 588 port_len = 0; 589 nc_handle = setnetconfig(); 590 while ((nconf = getnetconfig(nc_handle))) { 591 if (nconf->nc_flag & NC_VISIBLE) { 592 if (have_v6 == 0 && strcmp(nconf->nc_protofmly, 593 "inet6") == 0) { 594 /* DO NOTHING */ 595 } else { 596 ret = create_service(nconf); 597 if (ret == 1) 598 /* Ignore this call */ 599 continue; 600 if (ret < 0) { 601 /* 602 * Failed to bind port, so close off 603 * all sockets created and try again 604 * if the port# was dynamically 605 * assigned via bind(2). 606 */ 607 clearout_service(); 608 if (mallocd_svcport != 0 && 609 attempt_cnt < GETPORT_MAXTRY) { 610 free(svcport_str); 611 svcport_str = NULL; 612 mallocd_svcport = 0; 613 } else { 614 errno = EADDRINUSE; 615 syslog(LOG_ERR, 616 "bindresvport_sa: %m"); 617 exit(1); 618 } 619 620 /* Start over at the first service. */ 621 free(sock_fd); 622 sock_fdcnt = 0; 623 sock_fd = NULL; 624 nc_handle = setnetconfig(); 625 attempt_cnt++; 626 } else if (mallocd_svcport != 0 && 627 attempt_cnt == GETPORT_MAXTRY) { 628 /* 629 * For the last attempt, allow 630 * different port #s for each nconf 631 * by saving the svcport_str and 632 * setting it back to NULL. 633 */ 634 port_list = realloc(port_list, 635 (port_len + 1) * sizeof(char *)); 636 if (port_list == NULL) 637 out_of_mem(); 638 port_list[port_len++] = svcport_str; 639 svcport_str = NULL; 640 mallocd_svcport = 0; 641 } 642 } 643 } 644 } 645 646 /* 647 * Successfully bound the ports, so call complete_service() to 648 * do the rest of the setup on the service(s). 649 */ 650 sock_fdpos = 0; 651 port_pos = 0; 652 nc_handle = setnetconfig(); 653 while ((nconf = getnetconfig(nc_handle))) { 654 if (nconf->nc_flag & NC_VISIBLE) { 655 if (have_v6 == 0 && strcmp(nconf->nc_protofmly, 656 "inet6") == 0) { 657 /* DO NOTHING */ 658 } else if (port_list != NULL) { 659 if (port_pos >= port_len) { 660 syslog(LOG_ERR, "too many port#s"); 661 exit(1); 662 } 663 complete_service(nconf, port_list[port_pos++]); 664 } else 665 complete_service(nconf, svcport_str); 666 } 667 } 668 endnetconfig(nc_handle); 669 free(sock_fd); 670 if (port_list != NULL) { 671 for (port_pos = 0; port_pos < port_len; port_pos++) 672 free(port_list[port_pos]); 673 free(port_list); 674 } 675 676 if (xcreated == 0) { 677 syslog(LOG_ERR, "could not create any services"); 678 exit(1); 679 } 680 681 /* Expand svc_run() here so that we can call get_exportlist(). */ 682 curtime = nexttime = 0; 683 sigemptyset(&sighup_mask); 684 sigaddset(&sighup_mask, SIGHUP); 685 for (;;) { 686 clock_gettime(CLOCK_MONOTONIC, &tp); 687 curtime = tp.tv_sec; 688 curtime = curtime * 1000000 + tp.tv_nsec / 1000; 689 sigprocmask(SIG_BLOCK, &sighup_mask, NULL); 690 if (got_sighup && curtime >= nexttime) { 691 got_sighup = 0; 692 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 693 get_exportlist(1); 694 clock_gettime(CLOCK_MONOTONIC, &tp); 695 nexttime = tp.tv_sec; 696 nexttime = nexttime * 1000000 + tp.tv_nsec / 1000 + 697 RELOADDELAY; 698 } else 699 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 700 701 /* 702 * If a reload is pending, poll for received request(s), 703 * otherwise set a RELOADDELAY timeout, since a SIGHUP 704 * could be processed between the got_sighup test and 705 * the select() system call. 706 */ 707 tv.tv_sec = 0; 708 if (got_sighup) 709 tv.tv_usec = 0; 710 else 711 tv.tv_usec = RELOADDELAY; 712 readfds = svc_fdset; 713 switch (select(svc_maxfd + 1, &readfds, NULL, NULL, &tv)) { 714 case -1: 715 if (errno == EINTR) { 716 /* Allow a reload now. */ 717 nexttime = 0; 718 continue; 719 } 720 syslog(LOG_ERR, "mountd died: select: %m"); 721 exit(1); 722 case 0: 723 /* Allow a reload now. */ 724 nexttime = 0; 725 continue; 726 default: 727 svc_getreqset(&readfds); 728 } 729 } 730 } 731 732 /* 733 * This routine creates and binds sockets on the appropriate 734 * addresses. It gets called one time for each transport. 735 * It returns 0 upon success, 1 for ingore the call and -1 to indicate 736 * bind failed with EADDRINUSE. 737 * Any file descriptors that have been created are stored in sock_fd and 738 * the total count of them is maintained in sock_fdcnt. 739 */ 740 static int 741 create_service(struct netconfig *nconf) 742 { 743 struct addrinfo hints, *res = NULL; 744 struct sockaddr_in *sin; 745 struct sockaddr_in6 *sin6; 746 struct __rpc_sockinfo si; 747 int aicode; 748 int fd; 749 int nhostsbak; 750 int one = 1; 751 int r; 752 u_int32_t host_addr[4]; /* IPv4 or IPv6 */ 753 int mallocd_res; 754 755 if ((nconf->nc_semantics != NC_TPI_CLTS) && 756 (nconf->nc_semantics != NC_TPI_COTS) && 757 (nconf->nc_semantics != NC_TPI_COTS_ORD)) 758 return (1); /* not my type */ 759 760 /* 761 * XXX - using RPC library internal functions. 762 */ 763 if (!__rpc_nconf2sockinfo(nconf, &si)) { 764 syslog(LOG_ERR, "cannot get information for %s", 765 nconf->nc_netid); 766 return (1); 767 } 768 769 /* Get mountd's address on this transport */ 770 memset(&hints, 0, sizeof hints); 771 hints.ai_family = si.si_af; 772 hints.ai_socktype = si.si_socktype; 773 hints.ai_protocol = si.si_proto; 774 775 /* 776 * Bind to specific IPs if asked to 777 */ 778 nhostsbak = nhosts; 779 while (nhostsbak > 0) { 780 --nhostsbak; 781 sock_fd = realloc(sock_fd, (sock_fdcnt + 1) * sizeof(int)); 782 if (sock_fd == NULL) 783 out_of_mem(); 784 sock_fd[sock_fdcnt++] = -1; /* Set invalid for now. */ 785 mallocd_res = 0; 786 787 hints.ai_flags = AI_PASSIVE; 788 789 /* 790 * XXX - using RPC library internal functions. 791 */ 792 if ((fd = __rpc_nconf2fd(nconf)) < 0) { 793 int non_fatal = 0; 794 if (errno == EAFNOSUPPORT && 795 nconf->nc_semantics != NC_TPI_CLTS) 796 non_fatal = 1; 797 798 syslog(non_fatal ? LOG_DEBUG : LOG_ERR, 799 "cannot create socket for %s", nconf->nc_netid); 800 if (non_fatal != 0) 801 continue; 802 exit(1); 803 } 804 805 switch (hints.ai_family) { 806 case AF_INET: 807 if (inet_pton(AF_INET, hosts[nhostsbak], 808 host_addr) == 1) { 809 hints.ai_flags |= AI_NUMERICHOST; 810 } else { 811 /* 812 * Skip if we have an AF_INET6 address. 813 */ 814 if (inet_pton(AF_INET6, hosts[nhostsbak], 815 host_addr) == 1) { 816 close(fd); 817 continue; 818 } 819 } 820 break; 821 case AF_INET6: 822 if (inet_pton(AF_INET6, hosts[nhostsbak], 823 host_addr) == 1) { 824 hints.ai_flags |= AI_NUMERICHOST; 825 } else { 826 /* 827 * Skip if we have an AF_INET address. 828 */ 829 if (inet_pton(AF_INET, hosts[nhostsbak], 830 host_addr) == 1) { 831 close(fd); 832 continue; 833 } 834 } 835 836 /* 837 * We're doing host-based access checks here, so don't 838 * allow v4-in-v6 to confuse things. The kernel will 839 * disable it by default on NFS sockets too. 840 */ 841 if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, 842 sizeof one) < 0) { 843 syslog(LOG_ERR, 844 "can't disable v4-in-v6 on IPv6 socket"); 845 exit(1); 846 } 847 break; 848 default: 849 break; 850 } 851 852 /* 853 * If no hosts were specified, just bind to INADDR_ANY 854 */ 855 if (strcmp("*", hosts[nhostsbak]) == 0) { 856 if (svcport_str == NULL) { 857 res = malloc(sizeof(struct addrinfo)); 858 if (res == NULL) 859 out_of_mem(); 860 mallocd_res = 1; 861 res->ai_flags = hints.ai_flags; 862 res->ai_family = hints.ai_family; 863 res->ai_protocol = hints.ai_protocol; 864 switch (res->ai_family) { 865 case AF_INET: 866 sin = malloc(sizeof(struct sockaddr_in)); 867 if (sin == NULL) 868 out_of_mem(); 869 sin->sin_family = AF_INET; 870 sin->sin_port = htons(0); 871 sin->sin_addr.s_addr = htonl(INADDR_ANY); 872 res->ai_addr = (struct sockaddr*) sin; 873 res->ai_addrlen = (socklen_t) 874 sizeof(struct sockaddr_in); 875 break; 876 case AF_INET6: 877 sin6 = malloc(sizeof(struct sockaddr_in6)); 878 if (sin6 == NULL) 879 out_of_mem(); 880 sin6->sin6_family = AF_INET6; 881 sin6->sin6_port = htons(0); 882 sin6->sin6_addr = in6addr_any; 883 res->ai_addr = (struct sockaddr*) sin6; 884 res->ai_addrlen = (socklen_t) 885 sizeof(struct sockaddr_in6); 886 break; 887 default: 888 syslog(LOG_ERR, "bad addr fam %d", 889 res->ai_family); 890 exit(1); 891 } 892 } else { 893 if ((aicode = getaddrinfo(NULL, svcport_str, 894 &hints, &res)) != 0) { 895 syslog(LOG_ERR, 896 "cannot get local address for %s: %s", 897 nconf->nc_netid, 898 gai_strerror(aicode)); 899 close(fd); 900 continue; 901 } 902 } 903 } else { 904 if ((aicode = getaddrinfo(hosts[nhostsbak], svcport_str, 905 &hints, &res)) != 0) { 906 syslog(LOG_ERR, 907 "cannot get local address for %s: %s", 908 nconf->nc_netid, gai_strerror(aicode)); 909 close(fd); 910 continue; 911 } 912 } 913 914 /* Store the fd. */ 915 sock_fd[sock_fdcnt - 1] = fd; 916 917 /* Now, attempt the bind. */ 918 r = bindresvport_sa(fd, res->ai_addr); 919 if (r != 0) { 920 if (errno == EADDRINUSE && mallocd_svcport != 0) { 921 if (mallocd_res != 0) { 922 free(res->ai_addr); 923 free(res); 924 } else 925 freeaddrinfo(res); 926 return (-1); 927 } 928 syslog(LOG_ERR, "bindresvport_sa: %m"); 929 exit(1); 930 } 931 932 if (svcport_str == NULL) { 933 svcport_str = malloc(NI_MAXSERV * sizeof(char)); 934 if (svcport_str == NULL) 935 out_of_mem(); 936 mallocd_svcport = 1; 937 938 if (getnameinfo(res->ai_addr, 939 res->ai_addr->sa_len, NULL, NI_MAXHOST, 940 svcport_str, NI_MAXSERV * sizeof(char), 941 NI_NUMERICHOST | NI_NUMERICSERV)) 942 errx(1, "Cannot get port number"); 943 } 944 if (mallocd_res != 0) { 945 free(res->ai_addr); 946 free(res); 947 } else 948 freeaddrinfo(res); 949 res = NULL; 950 } 951 return (0); 952 } 953 954 /* 955 * Called after all the create_service() calls have succeeded, to complete 956 * the setup and registration. 957 */ 958 static void 959 complete_service(struct netconfig *nconf, char *port_str) 960 { 961 struct addrinfo hints, *res = NULL; 962 struct __rpc_sockinfo si; 963 struct netbuf servaddr; 964 SVCXPRT *transp = NULL; 965 int aicode, fd, nhostsbak; 966 int registered = 0; 967 968 if ((nconf->nc_semantics != NC_TPI_CLTS) && 969 (nconf->nc_semantics != NC_TPI_COTS) && 970 (nconf->nc_semantics != NC_TPI_COTS_ORD)) 971 return; /* not my type */ 972 973 /* 974 * XXX - using RPC library internal functions. 975 */ 976 if (!__rpc_nconf2sockinfo(nconf, &si)) { 977 syslog(LOG_ERR, "cannot get information for %s", 978 nconf->nc_netid); 979 return; 980 } 981 982 nhostsbak = nhosts; 983 while (nhostsbak > 0) { 984 --nhostsbak; 985 if (sock_fdpos >= sock_fdcnt) { 986 /* Should never happen. */ 987 syslog(LOG_ERR, "Ran out of socket fd's"); 988 return; 989 } 990 fd = sock_fd[sock_fdpos++]; 991 if (fd < 0) 992 continue; 993 994 /* 995 * Using -1 tells listen(2) to use 996 * kern.ipc.soacceptqueue for the backlog. 997 */ 998 if (nconf->nc_semantics != NC_TPI_CLTS) 999 listen(fd, -1); 1000 1001 if (nconf->nc_semantics == NC_TPI_CLTS ) 1002 transp = svc_dg_create(fd, 0, 0); 1003 else 1004 transp = svc_vc_create(fd, RPC_MAXDATASIZE, 1005 RPC_MAXDATASIZE); 1006 1007 if (transp != (SVCXPRT *) NULL) { 1008 if (!svc_reg(transp, MOUNTPROG, MOUNTVERS, mntsrv, 1009 NULL)) 1010 syslog(LOG_ERR, 1011 "can't register %s MOUNTVERS service", 1012 nconf->nc_netid); 1013 if (!force_v2) { 1014 if (!svc_reg(transp, MOUNTPROG, MOUNTVERS3, 1015 mntsrv, NULL)) 1016 syslog(LOG_ERR, 1017 "can't register %s MOUNTVERS3 service", 1018 nconf->nc_netid); 1019 } 1020 } else 1021 syslog(LOG_WARNING, "can't create %s services", 1022 nconf->nc_netid); 1023 1024 if (registered == 0) { 1025 registered = 1; 1026 memset(&hints, 0, sizeof hints); 1027 hints.ai_flags = AI_PASSIVE; 1028 hints.ai_family = si.si_af; 1029 hints.ai_socktype = si.si_socktype; 1030 hints.ai_protocol = si.si_proto; 1031 1032 if ((aicode = getaddrinfo(NULL, port_str, &hints, 1033 &res)) != 0) { 1034 syslog(LOG_ERR, "cannot get local address: %s", 1035 gai_strerror(aicode)); 1036 exit(1); 1037 } 1038 1039 servaddr.buf = malloc(res->ai_addrlen); 1040 memcpy(servaddr.buf, res->ai_addr, res->ai_addrlen); 1041 servaddr.len = res->ai_addrlen; 1042 1043 rpcb_set(MOUNTPROG, MOUNTVERS, nconf, &servaddr); 1044 rpcb_set(MOUNTPROG, MOUNTVERS3, nconf, &servaddr); 1045 1046 xcreated++; 1047 freeaddrinfo(res); 1048 } 1049 } /* end while */ 1050 } 1051 1052 /* 1053 * Clear out sockets after a failure to bind one of them, so that the 1054 * cycle of socket creation/binding can start anew. 1055 */ 1056 static void 1057 clearout_service(void) 1058 { 1059 int i; 1060 1061 for (i = 0; i < sock_fdcnt; i++) { 1062 if (sock_fd[i] >= 0) { 1063 shutdown(sock_fd[i], SHUT_RDWR); 1064 close(sock_fd[i]); 1065 } 1066 } 1067 } 1068 1069 static void 1070 usage(void) 1071 { 1072 fprintf(stderr, 1073 "usage: mountd [-2] [-d] [-e] [-l] [-n] [-p <port>] [-r] " 1074 "[-S] [-h <bindip>] [export_file ...]\n"); 1075 exit(1); 1076 } 1077 1078 /* 1079 * The mount rpc service 1080 */ 1081 void 1082 mntsrv(struct svc_req *rqstp, SVCXPRT *transp) 1083 { 1084 struct exportlist *ep; 1085 struct dirlist *dp; 1086 struct fhreturn fhr; 1087 struct stat stb; 1088 struct statfs fsb; 1089 char host[NI_MAXHOST], numerichost[NI_MAXHOST]; 1090 int lookup_failed = 1; 1091 struct sockaddr *saddr; 1092 u_short sport; 1093 char rpcpath[MNTPATHLEN + 1], dirpath[MAXPATHLEN]; 1094 int bad = 0, defset, hostset; 1095 sigset_t sighup_mask; 1096 int numsecflavors, *secflavorsp; 1097 1098 sigemptyset(&sighup_mask); 1099 sigaddset(&sighup_mask, SIGHUP); 1100 saddr = svc_getrpccaller(transp)->buf; 1101 switch (saddr->sa_family) { 1102 case AF_INET6: 1103 sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port); 1104 break; 1105 case AF_INET: 1106 sport = ntohs(((struct sockaddr_in *)saddr)->sin_port); 1107 break; 1108 default: 1109 syslog(LOG_ERR, "request from unknown address family"); 1110 return; 1111 } 1112 switch (rqstp->rq_proc) { 1113 case MOUNTPROC_MNT: 1114 case MOUNTPROC_UMNT: 1115 case MOUNTPROC_UMNTALL: 1116 lookup_failed = getnameinfo(saddr, saddr->sa_len, host, 1117 sizeof host, NULL, 0, 0); 1118 } 1119 getnameinfo(saddr, saddr->sa_len, numerichost, 1120 sizeof numerichost, NULL, 0, NI_NUMERICHOST); 1121 switch (rqstp->rq_proc) { 1122 case NULLPROC: 1123 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL)) 1124 syslog(LOG_ERR, "can't send reply"); 1125 return; 1126 case MOUNTPROC_MNT: 1127 if (sport >= IPPORT_RESERVED && resvport_only) { 1128 syslog(LOG_NOTICE, 1129 "mount request from %s from unprivileged port", 1130 numerichost); 1131 svcerr_weakauth(transp); 1132 return; 1133 } 1134 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) { 1135 syslog(LOG_NOTICE, "undecodable mount request from %s", 1136 numerichost); 1137 svcerr_decode(transp); 1138 return; 1139 } 1140 1141 /* 1142 * Get the real pathname and make sure it is a directory 1143 * or a regular file if the -r option was specified 1144 * and it exists. 1145 */ 1146 if (realpath(rpcpath, dirpath) == NULL || 1147 stat(dirpath, &stb) < 0 || 1148 statfs(dirpath, &fsb) < 0) { 1149 chdir("/"); /* Just in case realpath doesn't */ 1150 syslog(LOG_NOTICE, 1151 "mount request from %s for non existent path %s", 1152 numerichost, dirpath); 1153 if (debug) 1154 warnx("stat failed on %s", dirpath); 1155 bad = ENOENT; /* We will send error reply later */ 1156 } 1157 if (!bad && 1158 !S_ISDIR(stb.st_mode) && 1159 (dir_only || !S_ISREG(stb.st_mode))) { 1160 syslog(LOG_NOTICE, 1161 "mount request from %s for non-directory path %s", 1162 numerichost, dirpath); 1163 if (debug) 1164 warnx("mounting non-directory %s", dirpath); 1165 bad = ENOTDIR; /* We will send error reply later */ 1166 } 1167 1168 /* Check in the exports list */ 1169 sigprocmask(SIG_BLOCK, &sighup_mask, NULL); 1170 if (bad) 1171 ep = NULL; 1172 else 1173 ep = ex_search(&fsb.f_fsid, exphead); 1174 hostset = defset = 0; 1175 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset, 1176 &numsecflavors, &secflavorsp) || 1177 ((dp = dirp_search(ep->ex_dirl, dirpath)) && 1178 chk_host(dp, saddr, &defset, &hostset, &numsecflavors, 1179 &secflavorsp)) || 1180 (defset && scan_tree(ep->ex_defdir, saddr) == 0 && 1181 scan_tree(ep->ex_dirl, saddr) == 0))) { 1182 if (bad) { 1183 if (!svc_sendreply(transp, (xdrproc_t)xdr_long, 1184 (caddr_t)&bad)) 1185 syslog(LOG_ERR, "can't send reply"); 1186 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 1187 return; 1188 } 1189 if (hostset & DP_HOSTSET) { 1190 fhr.fhr_flag = hostset; 1191 fhr.fhr_numsecflavors = numsecflavors; 1192 fhr.fhr_secflavors = secflavorsp; 1193 } else { 1194 fhr.fhr_flag = defset; 1195 fhr.fhr_numsecflavors = ep->ex_defnumsecflavors; 1196 fhr.fhr_secflavors = ep->ex_defsecflavors; 1197 } 1198 fhr.fhr_vers = rqstp->rq_vers; 1199 /* Get the file handle */ 1200 memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t)); 1201 if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) { 1202 bad = errno; 1203 syslog(LOG_ERR, "can't get fh for %s", dirpath); 1204 if (!svc_sendreply(transp, (xdrproc_t)xdr_long, 1205 (caddr_t)&bad)) 1206 syslog(LOG_ERR, "can't send reply"); 1207 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 1208 return; 1209 } 1210 if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs, 1211 (caddr_t)&fhr)) 1212 syslog(LOG_ERR, "can't send reply"); 1213 if (!lookup_failed) 1214 add_mlist(host, dirpath); 1215 else 1216 add_mlist(numerichost, dirpath); 1217 if (debug) 1218 warnx("mount successful"); 1219 if (dolog) 1220 syslog(LOG_NOTICE, 1221 "mount request succeeded from %s for %s", 1222 numerichost, dirpath); 1223 } else { 1224 if (!bad) 1225 bad = EACCES; 1226 syslog(LOG_NOTICE, 1227 "mount request denied from %s for %s", 1228 numerichost, dirpath); 1229 } 1230 1231 if (bad && !svc_sendreply(transp, (xdrproc_t)xdr_long, 1232 (caddr_t)&bad)) 1233 syslog(LOG_ERR, "can't send reply"); 1234 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 1235 return; 1236 case MOUNTPROC_DUMP: 1237 if (!svc_sendreply(transp, (xdrproc_t)xdr_mlist, (caddr_t)NULL)) 1238 syslog(LOG_ERR, "can't send reply"); 1239 else if (dolog) 1240 syslog(LOG_NOTICE, 1241 "dump request succeeded from %s", 1242 numerichost); 1243 return; 1244 case MOUNTPROC_UMNT: 1245 if (sport >= IPPORT_RESERVED && resvport_only) { 1246 syslog(LOG_NOTICE, 1247 "umount request from %s from unprivileged port", 1248 numerichost); 1249 svcerr_weakauth(transp); 1250 return; 1251 } 1252 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) { 1253 syslog(LOG_NOTICE, "undecodable umount request from %s", 1254 numerichost); 1255 svcerr_decode(transp); 1256 return; 1257 } 1258 if (realpath(rpcpath, dirpath) == NULL) { 1259 syslog(LOG_NOTICE, "umount request from %s " 1260 "for non existent path %s", 1261 numerichost, dirpath); 1262 } 1263 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL)) 1264 syslog(LOG_ERR, "can't send reply"); 1265 if (!lookup_failed) 1266 del_mlist(host, dirpath); 1267 del_mlist(numerichost, dirpath); 1268 if (dolog) 1269 syslog(LOG_NOTICE, 1270 "umount request succeeded from %s for %s", 1271 numerichost, dirpath); 1272 return; 1273 case MOUNTPROC_UMNTALL: 1274 if (sport >= IPPORT_RESERVED && resvport_only) { 1275 syslog(LOG_NOTICE, 1276 "umountall request from %s from unprivileged port", 1277 numerichost); 1278 svcerr_weakauth(transp); 1279 return; 1280 } 1281 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL)) 1282 syslog(LOG_ERR, "can't send reply"); 1283 if (!lookup_failed) 1284 del_mlist(host, NULL); 1285 del_mlist(numerichost, NULL); 1286 if (dolog) 1287 syslog(LOG_NOTICE, 1288 "umountall request succeeded from %s", 1289 numerichost); 1290 return; 1291 case MOUNTPROC_EXPORT: 1292 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, (caddr_t)NULL)) 1293 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist_brief, 1294 (caddr_t)NULL)) 1295 syslog(LOG_ERR, "can't send reply"); 1296 if (dolog) 1297 syslog(LOG_NOTICE, 1298 "export request succeeded from %s", 1299 numerichost); 1300 return; 1301 default: 1302 svcerr_noproc(transp); 1303 return; 1304 } 1305 } 1306 1307 /* 1308 * Xdr conversion for a dirpath string 1309 */ 1310 static int 1311 xdr_dir(XDR *xdrsp, char *dirp) 1312 { 1313 return (xdr_string(xdrsp, &dirp, MNTPATHLEN)); 1314 } 1315 1316 /* 1317 * Xdr routine to generate file handle reply 1318 */ 1319 static int 1320 xdr_fhs(XDR *xdrsp, caddr_t cp) 1321 { 1322 struct fhreturn *fhrp = (struct fhreturn *)cp; 1323 u_long ok = 0, len, auth; 1324 int i; 1325 1326 if (!xdr_long(xdrsp, &ok)) 1327 return (0); 1328 switch (fhrp->fhr_vers) { 1329 case 1: 1330 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH)); 1331 case 3: 1332 len = NFSX_V3FH; 1333 if (!xdr_long(xdrsp, &len)) 1334 return (0); 1335 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len)) 1336 return (0); 1337 if (fhrp->fhr_numsecflavors) { 1338 if (!xdr_int(xdrsp, &fhrp->fhr_numsecflavors)) 1339 return (0); 1340 for (i = 0; i < fhrp->fhr_numsecflavors; i++) 1341 if (!xdr_int(xdrsp, &fhrp->fhr_secflavors[i])) 1342 return (0); 1343 return (1); 1344 } else { 1345 auth = AUTH_SYS; 1346 len = 1; 1347 if (!xdr_long(xdrsp, &len)) 1348 return (0); 1349 return (xdr_long(xdrsp, &auth)); 1350 } 1351 } 1352 return (0); 1353 } 1354 1355 static int 1356 xdr_mlist(XDR *xdrsp, caddr_t cp __unused) 1357 { 1358 struct mountlist *mlp; 1359 int true = 1; 1360 int false = 0; 1361 char *strp; 1362 1363 SLIST_FOREACH(mlp, &mlhead, next) { 1364 if (!xdr_bool(xdrsp, &true)) 1365 return (0); 1366 strp = &mlp->ml_host[0]; 1367 if (!xdr_string(xdrsp, &strp, MNTNAMLEN)) 1368 return (0); 1369 strp = &mlp->ml_dirp[0]; 1370 if (!xdr_string(xdrsp, &strp, MNTPATHLEN)) 1371 return (0); 1372 } 1373 if (!xdr_bool(xdrsp, &false)) 1374 return (0); 1375 return (1); 1376 } 1377 1378 /* 1379 * Xdr conversion for export list 1380 */ 1381 static int 1382 xdr_explist_common(XDR *xdrsp, caddr_t cp __unused, int brief) 1383 { 1384 struct exportlist *ep; 1385 int false = 0; 1386 int putdef; 1387 sigset_t sighup_mask; 1388 int i; 1389 1390 sigemptyset(&sighup_mask); 1391 sigaddset(&sighup_mask, SIGHUP); 1392 sigprocmask(SIG_BLOCK, &sighup_mask, NULL); 1393 1394 for (i = 0; i < exphashsize; i++) 1395 SLIST_FOREACH(ep, &exphead[i], entries) { 1396 putdef = 0; 1397 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir, 1398 &putdef, brief)) 1399 goto errout; 1400 if (ep->ex_defdir && putdef == 0 && 1401 put_exlist(ep->ex_defdir, xdrsp, NULL, 1402 &putdef, brief)) 1403 goto errout; 1404 } 1405 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 1406 if (!xdr_bool(xdrsp, &false)) 1407 return (0); 1408 return (1); 1409 errout: 1410 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 1411 return (0); 1412 } 1413 1414 /* 1415 * Called from xdr_explist() to traverse the tree and export the 1416 * directory paths. 1417 */ 1418 static int 1419 put_exlist(struct dirlist *dp, XDR *xdrsp, struct dirlist *adp, int *putdefp, 1420 int brief) 1421 { 1422 struct grouplist *grp; 1423 struct hostlist *hp; 1424 int true = 1; 1425 int false = 0; 1426 int gotalldir = 0; 1427 char *strp; 1428 1429 if (dp) { 1430 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp, brief)) 1431 return (1); 1432 if (!xdr_bool(xdrsp, &true)) 1433 return (1); 1434 strp = dp->dp_dirp; 1435 if (!xdr_string(xdrsp, &strp, MNTPATHLEN)) 1436 return (1); 1437 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) { 1438 gotalldir = 1; 1439 *putdefp = 1; 1440 } 1441 if (brief) { 1442 if (!xdr_bool(xdrsp, &true)) 1443 return (1); 1444 strp = "(...)"; 1445 if (!xdr_string(xdrsp, &strp, MNTPATHLEN)) 1446 return (1); 1447 } else if ((dp->dp_flag & DP_DEFSET) == 0 && 1448 (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) { 1449 hp = dp->dp_hosts; 1450 while (hp) { 1451 grp = hp->ht_grp; 1452 if (grp->gr_type == GT_HOST) { 1453 if (!xdr_bool(xdrsp, &true)) 1454 return (1); 1455 strp = grp->gr_ptr.gt_addrinfo->ai_canonname; 1456 if (!xdr_string(xdrsp, &strp, 1457 MNTNAMLEN)) 1458 return (1); 1459 } else if (grp->gr_type == GT_NET) { 1460 if (!xdr_bool(xdrsp, &true)) 1461 return (1); 1462 strp = grp->gr_ptr.gt_net.nt_name; 1463 if (!xdr_string(xdrsp, &strp, 1464 MNTNAMLEN)) 1465 return (1); 1466 } 1467 hp = hp->ht_next; 1468 if (gotalldir && hp == (struct hostlist *)NULL) { 1469 hp = adp->dp_hosts; 1470 gotalldir = 0; 1471 } 1472 } 1473 } 1474 if (!xdr_bool(xdrsp, &false)) 1475 return (1); 1476 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp, brief)) 1477 return (1); 1478 } 1479 return (0); 1480 } 1481 1482 static int 1483 xdr_explist(XDR *xdrsp, caddr_t cp) 1484 { 1485 1486 return xdr_explist_common(xdrsp, cp, 0); 1487 } 1488 1489 static int 1490 xdr_explist_brief(XDR *xdrsp, caddr_t cp) 1491 { 1492 1493 return xdr_explist_common(xdrsp, cp, 1); 1494 } 1495 1496 static char *line; 1497 static size_t linesize; 1498 static FILE *exp_file; 1499 1500 /* 1501 * Get the export list from one, currently open file 1502 */ 1503 static void 1504 get_exportlist_one(int passno) 1505 { 1506 struct exportlist *ep; 1507 struct grouplist *grp, *tgrp, *savgrp; 1508 struct dirlist *dirhead; 1509 struct statfs fsb; 1510 struct expcred anon; 1511 char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc; 1512 int len, has_host, got_nondir, dirplen, netgrp; 1513 uint64_t exflags; 1514 1515 v4root_phase = 0; 1516 dirhead = (struct dirlist *)NULL; 1517 while (get_line()) { 1518 if (debug) 1519 warnx("got line %s", line); 1520 cp = line; 1521 nextfield(&cp, &endcp); 1522 if (*cp == '#') 1523 goto nextline; 1524 1525 /* 1526 * Set defaults. 1527 */ 1528 has_host = FALSE; 1529 anon.cr_uid = UID_NOBODY; 1530 anon.cr_ngroups = 1; 1531 anon.cr_groups[0] = GID_NOGROUP; 1532 exflags = MNT_EXPORTED; 1533 got_nondir = 0; 1534 opt_flags = 0; 1535 ep = (struct exportlist *)NULL; 1536 dirp = NULL; 1537 1538 /* 1539 * Handle the V4 root dir. 1540 */ 1541 if (*cp == 'V' && *(cp + 1) == '4' && *(cp + 2) == ':') { 1542 /* 1543 * V4: just indicates that it is the v4 root point, 1544 * so skip over that and set v4root_phase. 1545 */ 1546 if (v4root_phase > 0) { 1547 syslog(LOG_ERR, "V4:duplicate line, ignored"); 1548 goto nextline; 1549 } 1550 v4root_phase = 1; 1551 cp += 3; 1552 nextfield(&cp, &endcp); 1553 } 1554 1555 /* 1556 * Create new exports list entry 1557 */ 1558 len = endcp-cp; 1559 tgrp = grp = get_grp(); 1560 while (len > 0) { 1561 if (len > MNTNAMLEN) { 1562 getexp_err(ep, tgrp, "mountpoint too long"); 1563 goto nextline; 1564 } 1565 if (*cp == '-') { 1566 if (ep == (struct exportlist *)NULL) { 1567 getexp_err(ep, tgrp, 1568 "flag before export path definition"); 1569 goto nextline; 1570 } 1571 if (debug) 1572 warnx("doing opt %s", cp); 1573 got_nondir = 1; 1574 if (do_opt(&cp, &endcp, ep, grp, &has_host, 1575 &exflags, &anon)) { 1576 getexp_err(ep, tgrp, NULL); 1577 goto nextline; 1578 } 1579 } else if (*cp == '/') { 1580 savedc = *endcp; 1581 *endcp = '\0'; 1582 if (v4root_phase > 1) { 1583 if (dirp != NULL) { 1584 getexp_err(ep, tgrp, "Multiple V4 dirs"); 1585 goto nextline; 1586 } 1587 } 1588 if (check_dirpath(cp) && 1589 statfs(cp, &fsb) >= 0) { 1590 if ((fsb.f_flags & MNT_AUTOMOUNTED) != 0) 1591 syslog(LOG_ERR, "Warning: exporting of " 1592 "automounted fs %s not supported", cp); 1593 if (got_nondir) { 1594 getexp_err(ep, tgrp, "dirs must be first"); 1595 goto nextline; 1596 } 1597 if (v4root_phase == 1) { 1598 if (dirp != NULL) { 1599 getexp_err(ep, tgrp, "Multiple V4 dirs"); 1600 goto nextline; 1601 } 1602 if (strlen(v4root_dirpath) == 0) { 1603 strlcpy(v4root_dirpath, cp, 1604 sizeof (v4root_dirpath)); 1605 } else if (strcmp(v4root_dirpath, cp) 1606 != 0) { 1607 syslog(LOG_ERR, 1608 "different V4 dirpath %s", cp); 1609 getexp_err(ep, tgrp, NULL); 1610 goto nextline; 1611 } 1612 dirp = cp; 1613 v4root_phase = 2; 1614 got_nondir = 1; 1615 ep = get_exp(); 1616 } else { 1617 if (ep) { 1618 if (fsidcmp(&ep->ex_fs, &fsb.f_fsid) 1619 != 0) { 1620 getexp_err(ep, tgrp, 1621 "fsid mismatch"); 1622 goto nextline; 1623 } 1624 } else { 1625 /* 1626 * See if this directory is already 1627 * in the list. 1628 */ 1629 ep = ex_search(&fsb.f_fsid, exphead); 1630 if (ep == (struct exportlist *)NULL) { 1631 ep = get_exp(); 1632 ep->ex_fs = fsb.f_fsid; 1633 ep->ex_fsdir = strdup(fsb.f_mntonname); 1634 if (ep->ex_fsdir == NULL) 1635 out_of_mem(); 1636 if (debug) 1637 warnx( 1638 "making new ep fs=0x%x,0x%x", 1639 fsb.f_fsid.val[0], 1640 fsb.f_fsid.val[1]); 1641 } else if (debug) 1642 warnx("found ep fs=0x%x,0x%x", 1643 fsb.f_fsid.val[0], 1644 fsb.f_fsid.val[1]); 1645 } 1646 1647 /* 1648 * Add dirpath to export mount point. 1649 */ 1650 dirp = add_expdir(&dirhead, cp, len); 1651 dirplen = len; 1652 } 1653 } else { 1654 getexp_err(ep, tgrp, 1655 "symbolic link in export path or statfs failed"); 1656 goto nextline; 1657 } 1658 *endcp = savedc; 1659 } else { 1660 savedc = *endcp; 1661 *endcp = '\0'; 1662 got_nondir = 1; 1663 if (ep == (struct exportlist *)NULL) { 1664 getexp_err(ep, tgrp, 1665 "host(s) before export path definition"); 1666 goto nextline; 1667 } 1668 1669 /* 1670 * Get the host or netgroup. 1671 */ 1672 setnetgrent(cp); 1673 netgrp = getnetgrent(&hst, &usr, &dom); 1674 do { 1675 if (has_host) { 1676 grp->gr_next = get_grp(); 1677 grp = grp->gr_next; 1678 } 1679 if (netgrp) { 1680 if (hst == 0) { 1681 syslog(LOG_ERR, 1682 "null hostname in netgroup %s, skipping", cp); 1683 grp->gr_type = GT_IGNORE; 1684 } else if (get_host(hst, grp, tgrp)) { 1685 syslog(LOG_ERR, 1686 "bad host %s in netgroup %s, skipping", hst, cp); 1687 grp->gr_type = GT_IGNORE; 1688 } 1689 } else if (get_host(cp, grp, tgrp)) { 1690 syslog(LOG_ERR, "bad host %s, skipping", cp); 1691 grp->gr_type = GT_IGNORE; 1692 } 1693 has_host = TRUE; 1694 } while (netgrp && getnetgrent(&hst, &usr, &dom)); 1695 endnetgrent(); 1696 *endcp = savedc; 1697 } 1698 cp = endcp; 1699 nextfield(&cp, &endcp); 1700 len = endcp - cp; 1701 } 1702 if (check_options(dirhead)) { 1703 getexp_err(ep, tgrp, NULL); 1704 goto nextline; 1705 } 1706 if (!has_host) { 1707 grp->gr_type = GT_DEFAULT; 1708 if (debug) 1709 warnx("adding a default entry"); 1710 1711 /* 1712 * Don't allow a network export coincide with a list of 1713 * host(s) on the same line. 1714 */ 1715 } else if ((opt_flags & OP_NET) && tgrp->gr_next) { 1716 getexp_err(ep, tgrp, "network/host conflict"); 1717 goto nextline; 1718 1719 /* 1720 * If an export list was specified on this line, make sure 1721 * that we have at least one valid entry, otherwise skip it. 1722 */ 1723 } else { 1724 grp = tgrp; 1725 while (grp && grp->gr_type == GT_IGNORE) 1726 grp = grp->gr_next; 1727 if (! grp) { 1728 getexp_err(ep, tgrp, "no valid entries"); 1729 goto nextline; 1730 } 1731 } 1732 1733 if (v4root_phase == 1) { 1734 getexp_err(ep, tgrp, "V4:root, no dirp, ignored"); 1735 goto nextline; 1736 } 1737 1738 /* 1739 * Loop through hosts, pushing the exports into the kernel. 1740 * After loop, tgrp points to the start of the list and 1741 * grp points to the last entry in the list. 1742 * Do not do the do_mount() for passno == 1, since the 1743 * second pass will do it, as required. 1744 */ 1745 grp = tgrp; 1746 do { 1747 grp->gr_exflags = exflags; 1748 cp_cred(&grp->gr_anon, &anon); 1749 if (v4root_phase == 2 && passno == 0) 1750 LOGDEBUG("do_mount v4root"); 1751 if (passno == 0 && do_mount(ep, grp, exflags, &anon, 1752 dirp, dirplen, &fsb, ep->ex_numsecflavors, 1753 ep->ex_secflavors)) { 1754 getexp_err(ep, tgrp, NULL); 1755 goto nextline; 1756 } 1757 } while (grp->gr_next && (grp = grp->gr_next)); 1758 1759 /* 1760 * For V4: don't enter in mount lists. 1761 */ 1762 if (v4root_phase > 0 && v4root_phase <= 2) { 1763 /* 1764 * These structures are used for the reload, 1765 * so save them for that case. Otherwise, just 1766 * free them up now. 1767 */ 1768 if (passno == 1 && ep != NULL) { 1769 savgrp = tgrp; 1770 while (tgrp != NULL) { 1771 /* 1772 * Save the security flavors and exflags 1773 * for this host set in the groups. 1774 */ 1775 tgrp->gr_numsecflavors = 1776 ep->ex_numsecflavors; 1777 if (ep->ex_numsecflavors > 0) 1778 memcpy(tgrp->gr_secflavors, 1779 ep->ex_secflavors, 1780 sizeof(ep->ex_secflavors)); 1781 tgrp = tgrp->gr_next; 1782 } 1783 if (v4root_ep == NULL) { 1784 v4root_ep = ep; 1785 ep = NULL; /* Don't free below. */ 1786 } 1787 grp->gr_next = v4root_ep->ex_grphead; 1788 v4root_ep->ex_grphead = savgrp; 1789 } 1790 if (ep != NULL) 1791 free_exp(ep); 1792 while (tgrp != NULL) { 1793 grp = tgrp; 1794 tgrp = tgrp->gr_next; 1795 free_grp(grp); 1796 } 1797 goto nextline; 1798 } 1799 1800 /* 1801 * Success. Update the data structures. 1802 */ 1803 if (has_host) { 1804 hang_dirp(dirhead, tgrp, ep, opt_flags, &anon, exflags); 1805 grp->gr_next = ep->ex_grphead; 1806 ep->ex_grphead = tgrp; 1807 } else { 1808 hang_dirp(dirhead, (struct grouplist *)NULL, ep, 1809 opt_flags, &anon, exflags); 1810 free_grp(grp); 1811 } 1812 dirhead = (struct dirlist *)NULL; 1813 if ((ep->ex_flag & EX_LINKED) == 0) { 1814 insert_exports(ep, exphead); 1815 1816 ep->ex_flag |= EX_LINKED; 1817 } 1818 nextline: 1819 v4root_phase = 0; 1820 if (dirhead) { 1821 free_dir(dirhead); 1822 dirhead = (struct dirlist *)NULL; 1823 } 1824 } 1825 } 1826 1827 /* 1828 * Get the export list from all specified files 1829 */ 1830 static void 1831 get_exportlist(int passno) 1832 { 1833 struct export_args export; 1834 struct iovec *iov; 1835 struct statfs *mntbufp; 1836 char errmsg[255]; 1837 int num, i; 1838 int iovlen; 1839 struct nfsex_args eargs; 1840 FILE *debug_file; 1841 1842 if ((debug_file = fopen(_PATH_MOUNTDDEBUG, "r")) != NULL) { 1843 fclose(debug_file); 1844 logdebug = 1; 1845 } else 1846 logdebug = 0; 1847 LOGDEBUG("passno=%d", passno); 1848 v4root_dirpath[0] = '\0'; 1849 free_v4rootexp(); 1850 if (passno == 1) { 1851 /* 1852 * Save the current lists as old ones, so that the new lists 1853 * can be compared with the old ones in the 2nd pass. 1854 */ 1855 for (i = 0; i < exphashsize; i++) { 1856 SLIST_FIRST(&oldexphead[i]) = SLIST_FIRST(&exphead[i]); 1857 SLIST_INIT(&exphead[i]); 1858 } 1859 1860 /* Note that the public fh has not yet been set. */ 1861 has_set_publicfh = 0; 1862 1863 /* Read the export file(s) and process them */ 1864 read_exportfile(passno); 1865 } else { 1866 /* 1867 * Just make the old lists empty. 1868 * exphashsize == 0 for the first call, before oldexphead 1869 * has been initialized-->loop won't be executed. 1870 */ 1871 for (i = 0; i < exphashsize; i++) 1872 SLIST_INIT(&oldexphead[i]); 1873 } 1874 1875 bzero(&export, sizeof(export)); 1876 export.ex_flags = MNT_DELEXPORT; 1877 iov = NULL; 1878 iovlen = 0; 1879 bzero(errmsg, sizeof(errmsg)); 1880 1881 if (suspend_nfsd != 0) 1882 (void)nfssvc(NFSSVC_SUSPENDNFSD, NULL); 1883 /* 1884 * Delete the old V4 root dir. 1885 */ 1886 bzero(&eargs, sizeof (eargs)); 1887 eargs.export.ex_flags = MNT_DELEXPORT; 1888 if (nfssvc(NFSSVC_V4ROOTEXPORT | NFSSVC_NEWSTRUCT, (caddr_t)&eargs) < 0 && 1889 errno != ENOENT) 1890 syslog(LOG_ERR, "Can't delete exports for V4:"); 1891 1892 build_iovec(&iov, &iovlen, "fstype", NULL, 0); 1893 build_iovec(&iov, &iovlen, "fspath", NULL, 0); 1894 build_iovec(&iov, &iovlen, "from", NULL, 0); 1895 build_iovec(&iov, &iovlen, "update", NULL, 0); 1896 build_iovec(&iov, &iovlen, "export", &export, 1897 sizeof(export)); 1898 build_iovec(&iov, &iovlen, "errmsg", errmsg, 1899 sizeof(errmsg)); 1900 1901 /* 1902 * For passno == 1, compare the old and new lists updating the kernel 1903 * exports for any cases that have changed. 1904 * This call is doing the second pass through the lists. 1905 * If it fails, fall back on the bulk reload. 1906 */ 1907 if (passno == 1 && compare_nmount_exportlist(iov, iovlen, errmsg) == 1908 0) { 1909 LOGDEBUG("compareok"); 1910 /* Free up the old lists. */ 1911 free_exports(oldexphead); 1912 } else { 1913 LOGDEBUG("doing passno=0"); 1914 /* 1915 * Clear flag that notes if a public fh has been exported. 1916 * It is set by do_mount() if MNT_EXPUBLIC is set for the entry. 1917 */ 1918 has_publicfh = 0; 1919 1920 /* exphead == NULL if not yet allocated (first call). */ 1921 if (exphead != NULL) { 1922 /* 1923 * First, get rid of the old lists. 1924 */ 1925 free_exports(exphead); 1926 free_exports(oldexphead); 1927 } 1928 1929 /* 1930 * And delete exports that are in the kernel for all local 1931 * filesystems. 1932 * XXX: Should know how to handle all local exportable 1933 * filesystems. 1934 */ 1935 num = getmntinfo(&mntbufp, MNT_NOWAIT); 1936 1937 /* Allocate hash tables, for first call. */ 1938 if (exphead == NULL) { 1939 /* Target an average linked list length of 10. */ 1940 exphashsize = num / 10; 1941 if (exphashsize < 1) 1942 exphashsize = 1; 1943 else if (exphashsize > 100000) 1944 exphashsize = 100000; 1945 exphead = malloc(exphashsize * sizeof(*exphead)); 1946 oldexphead = malloc(exphashsize * sizeof(*oldexphead)); 1947 if (exphead == NULL || oldexphead == NULL) 1948 errx(1, "Can't malloc hash tables"); 1949 1950 for (i = 0; i < exphashsize; i++) { 1951 SLIST_INIT(&exphead[i]); 1952 SLIST_INIT(&oldexphead[i]); 1953 } 1954 } 1955 1956 for (i = 0; i < num; i++) 1957 delete_export(iov, iovlen, &mntbufp[i], errmsg); 1958 1959 1960 /* Read the export file(s) and process them */ 1961 read_exportfile(0); 1962 } 1963 1964 if (iov != NULL) { 1965 /* Free strings allocated by strdup() in getmntopts.c */ 1966 free(iov[0].iov_base); /* fstype */ 1967 free(iov[2].iov_base); /* fspath */ 1968 free(iov[4].iov_base); /* from */ 1969 free(iov[6].iov_base); /* update */ 1970 free(iov[8].iov_base); /* export */ 1971 free(iov[10].iov_base); /* errmsg */ 1972 1973 /* free iov, allocated by realloc() */ 1974 free(iov); 1975 iovlen = 0; 1976 } 1977 1978 /* 1979 * If there was no public fh, clear any previous one set. 1980 */ 1981 if (has_publicfh == 0) { 1982 LOGDEBUG("clear public fh"); 1983 (void) nfssvc(NFSSVC_NOPUBLICFH, NULL); 1984 } 1985 1986 /* Resume the nfsd. If they weren't suspended, this is harmless. */ 1987 (void)nfssvc(NFSSVC_RESUMENFSD, NULL); 1988 LOGDEBUG("eo get_exportlist"); 1989 } 1990 1991 /* 1992 * Insert an export entry in the appropriate list. 1993 */ 1994 static void 1995 insert_exports(struct exportlist *ep, struct exportlisthead *exhp) 1996 { 1997 uint32_t i; 1998 1999 i = EXPHASH(&ep->ex_fs); 2000 LOGDEBUG("fs=%s hash=%i", ep->ex_fsdir, i); 2001 SLIST_INSERT_HEAD(&exhp[i], ep, entries); 2002 } 2003 2004 /* 2005 * Free up the exports lists passed in as arguments. 2006 */ 2007 static void 2008 free_exports(struct exportlisthead *exhp) 2009 { 2010 struct exportlist *ep, *ep2; 2011 int i; 2012 2013 for (i = 0; i < exphashsize; i++) { 2014 SLIST_FOREACH_SAFE(ep, &exhp[i], entries, ep2) { 2015 SLIST_REMOVE(&exhp[i], ep, exportlist, entries); 2016 free_exp(ep); 2017 } 2018 SLIST_INIT(&exhp[i]); 2019 } 2020 } 2021 2022 /* 2023 * Read the exports file(s) and call get_exportlist_one() for each line. 2024 */ 2025 static void 2026 read_exportfile(int passno) 2027 { 2028 int done, i; 2029 2030 /* 2031 * Read in the exports file and build the list, calling 2032 * nmount() as we go along to push the export rules into the kernel. 2033 */ 2034 done = 0; 2035 for (i = 0; exnames[i] != NULL; i++) { 2036 if (debug) 2037 warnx("reading exports from %s", exnames[i]); 2038 if ((exp_file = fopen(exnames[i], "r")) == NULL) { 2039 syslog(LOG_WARNING, "can't open %s", exnames[i]); 2040 continue; 2041 } 2042 get_exportlist_one(passno); 2043 fclose(exp_file); 2044 done++; 2045 } 2046 if (done == 0) { 2047 syslog(LOG_ERR, "can't open any exports file"); 2048 exit(2); 2049 } 2050 } 2051 2052 /* 2053 * Compare the export lists against the old ones and do nmount() operations 2054 * for any cases that have changed. This avoids doing nmount() for entries 2055 * that have not changed. 2056 * Return 0 upon success, 1 otherwise. 2057 */ 2058 static int 2059 compare_nmount_exportlist(struct iovec *iov, int iovlen, char *errmsg) 2060 { 2061 struct exportlist *ep, *oep; 2062 struct grouplist *grp; 2063 struct statfs fs, ofs; 2064 int i, ret; 2065 2066 /* 2067 * Loop through the current list and look for an entry in the old 2068 * list. 2069 * If found, check to see if it the same. 2070 * If it is not the same, delete and re-export. 2071 * Then mark it done on the old list. 2072 * else (not found) 2073 * export it. 2074 * Any entries left in the old list after processing must have their 2075 * exports deleted. 2076 */ 2077 for (i = 0; i < exphashsize; i++) 2078 SLIST_FOREACH(ep, &exphead[i], entries) { 2079 LOGDEBUG("foreach ep=%s", ep->ex_fsdir); 2080 oep = ex_search(&ep->ex_fs, oldexphead); 2081 if (oep != NULL) { 2082 /* 2083 * Check the mount paths are the same. 2084 * If not, return 1 so that the reload of the 2085 * exports will be done in bulk, the 2086 * passno == 0 way. 2087 */ 2088 LOGDEBUG("found old exp"); 2089 if (strcmp(ep->ex_fsdir, oep->ex_fsdir) != 0) 2090 return (1); 2091 LOGDEBUG("same fsdir"); 2092 /* 2093 * Test to see if the entry is the same. 2094 * If not the same delete exports and 2095 * re-export. 2096 */ 2097 if (compare_export(ep, oep) != 0) { 2098 /* 2099 * Clear has_publicfh if if was set 2100 * in the old exports, but only if it 2101 * has not been set during processing of 2102 * the exports for this pass, as 2103 * indicated by has_set_publicfh. 2104 */ 2105 if (has_set_publicfh == 0 && 2106 (oep->ex_flag & EX_PUBLICFH) != 0) 2107 has_publicfh = 0; 2108 2109 /* Delete and re-export. */ 2110 if (statfs(ep->ex_fsdir, &fs) < 0) 2111 return (1); 2112 delete_export(iov, iovlen, &fs, errmsg); 2113 ret = do_export_mount(ep, &fs); 2114 if (ret != 0) 2115 return (ret); 2116 } 2117 oep->ex_flag |= EX_DONE; 2118 LOGDEBUG("exdone"); 2119 } else { 2120 LOGDEBUG("not found so export"); 2121 /* Not found, so do export. */ 2122 if (statfs(ep->ex_fsdir, &fs) < 0) 2123 return (1); 2124 ret = do_export_mount(ep, &fs); 2125 if (ret != 0) 2126 return (ret); 2127 } 2128 } 2129 2130 /* Delete exports not done. */ 2131 for (i = 0; i < exphashsize; i++) 2132 SLIST_FOREACH(oep, &oldexphead[i], entries) { 2133 if ((oep->ex_flag & EX_DONE) == 0) { 2134 LOGDEBUG("not done delete=%s", oep->ex_fsdir); 2135 if (statfs(oep->ex_fsdir, &ofs) >= 0 && 2136 fsidcmp(&oep->ex_fs, &ofs.f_fsid) == 0) { 2137 LOGDEBUG("do delete"); 2138 /* 2139 * Clear has_publicfh if if was set 2140 * in the old exports, but only if it 2141 * has not been set during processing of 2142 * the exports for this pass, as 2143 * indicated by has_set_publicfh. 2144 */ 2145 if (has_set_publicfh == 0 && 2146 (oep->ex_flag & EX_PUBLICFH) != 0) 2147 has_publicfh = 0; 2148 2149 delete_export(iov, iovlen, &ofs, 2150 errmsg); 2151 } 2152 } 2153 } 2154 2155 /* Do the V4 root exports, as required. */ 2156 grp = NULL; 2157 if (v4root_ep != NULL) 2158 grp = v4root_ep->ex_grphead; 2159 v4root_phase = 2; 2160 while (v4root_ep != NULL && grp != NULL) { 2161 LOGDEBUG("v4root expath=%s", v4root_dirpath); 2162 ret = do_mount(v4root_ep, grp, grp->gr_exflags, &grp->gr_anon, 2163 v4root_dirpath, strlen(v4root_dirpath), &fs, 2164 grp->gr_numsecflavors, grp->gr_secflavors); 2165 if (ret != 0) { 2166 v4root_phase = 0; 2167 return (ret); 2168 } 2169 grp = grp->gr_next; 2170 } 2171 v4root_phase = 0; 2172 free_v4rootexp(); 2173 return (0); 2174 } 2175 2176 /* 2177 * Compare old and current exportlist entries for the fsid and return 0 2178 * if they are the same, 1 otherwise. 2179 */ 2180 static int 2181 compare_export(struct exportlist *ep, struct exportlist *oep) 2182 { 2183 struct grouplist *grp, *ogrp; 2184 2185 if (strcmp(ep->ex_fsdir, oep->ex_fsdir) != 0) 2186 return (1); 2187 if ((ep->ex_flag & EX_DEFSET) != (oep->ex_flag & EX_DEFSET)) 2188 return (1); 2189 if ((ep->ex_defdir != NULL && oep->ex_defdir == NULL) || 2190 (ep->ex_defdir == NULL && oep->ex_defdir != NULL)) 2191 return (1); 2192 if (ep->ex_defdir != NULL && (ep->ex_defdir->dp_flag & DP_DEFSET) != 2193 (oep->ex_defdir->dp_flag & DP_DEFSET)) 2194 return (1); 2195 if ((ep->ex_flag & EX_DEFSET) != 0 && (ep->ex_defnumsecflavors != 2196 oep->ex_defnumsecflavors || ep->ex_defexflags != 2197 oep->ex_defexflags || compare_cred(&ep->ex_defanon, 2198 &oep->ex_defanon) != 0 || compare_secflavor(ep->ex_defsecflavors, 2199 oep->ex_defsecflavors, ep->ex_defnumsecflavors) != 0)) 2200 return (1); 2201 2202 /* Now, check all the groups. */ 2203 for (ogrp = oep->ex_grphead; ogrp != NULL; ogrp = ogrp->gr_next) 2204 ogrp->gr_flag = 0; 2205 for (grp = ep->ex_grphead; grp != NULL; grp = grp->gr_next) { 2206 for (ogrp = oep->ex_grphead; ogrp != NULL; ogrp = 2207 ogrp->gr_next) 2208 if ((ogrp->gr_flag & GR_FND) == 0 && 2209 grp->gr_numsecflavors == ogrp->gr_numsecflavors && 2210 grp->gr_exflags == ogrp->gr_exflags && 2211 compare_cred(&grp->gr_anon, &ogrp->gr_anon) == 0 && 2212 compare_secflavor(grp->gr_secflavors, 2213 ogrp->gr_secflavors, grp->gr_numsecflavors) == 0) 2214 break; 2215 if (ogrp != NULL) 2216 ogrp->gr_flag |= GR_FND; 2217 else 2218 return (1); 2219 } 2220 for (ogrp = oep->ex_grphead; ogrp != NULL; ogrp = ogrp->gr_next) 2221 if ((ogrp->gr_flag & GR_FND) == 0) 2222 return (1); 2223 return (0); 2224 } 2225 2226 /* 2227 * This algorithm compares two arrays of "n" items. It returns 0 if they are 2228 * the "same" and 1 otherwise. Although suboptimal, it is always safe to 2229 * return 1, which makes compare_nmount_export() reload the exports entry. 2230 * "same" refers to having the same set of values in the two arrays. 2231 * The arrays are in no particular order and duplicates (multiple entries 2232 * in an array with the same value) is allowed. 2233 * The algorithm is inefficient, but the common case of indentical arrays is 2234 * handled first and "n" is normally fairly small. 2235 * Since the two functions need the same algorithm but for arrays of 2236 * different types (gid_t vs int), this is done as a macro. 2237 */ 2238 #define COMPARE_ARRAYS(a1, a2, n) \ 2239 do { \ 2240 int fnd, fndarray[(n)], i, j; \ 2241 /* Handle common case of identical arrays. */ \ 2242 for (i = 0; i < (n); i++) \ 2243 if ((a1)[i] != (a2)[i]) \ 2244 break; \ 2245 if (i == (n)) \ 2246 return (0); \ 2247 for (i = 0; i < (n); i++) \ 2248 fndarray[i] = 0; \ 2249 for (i = 0; i < (n); i++) { \ 2250 fnd = 0; \ 2251 for (j = 0; j < (n); j++) { \ 2252 if ((a1)[i] == (a2)[j]) { \ 2253 fndarray[j] = 1; \ 2254 fnd = 1; \ 2255 } \ 2256 } \ 2257 if (fnd == 0) \ 2258 return (1); \ 2259 } \ 2260 for (i = 0; i < (n); i++) \ 2261 if (fndarray[i] == 0) \ 2262 return (1); \ 2263 return (0); \ 2264 } while (0) 2265 2266 /* 2267 * Compare two struct expcred's. Return 0 if the same and 1 otherwise. 2268 */ 2269 static int 2270 compare_cred(struct expcred *cr0, struct expcred *cr1) 2271 { 2272 2273 if (cr0->cr_uid != cr1->cr_uid || cr0->cr_ngroups != cr1->cr_ngroups) 2274 return (1); 2275 2276 COMPARE_ARRAYS(cr0->cr_groups, cr1->cr_groups, cr0->cr_ngroups); 2277 } 2278 2279 /* 2280 * Compare two lists of security flavors. Return 0 if the same and 1 otherwise. 2281 */ 2282 static int 2283 compare_secflavor(int *sec1, int *sec2, int nsec) 2284 { 2285 2286 COMPARE_ARRAYS(sec1, sec2, nsec); 2287 } 2288 2289 /* 2290 * Delete an exports entry. 2291 */ 2292 static void 2293 delete_export(struct iovec *iov, int iovlen, struct statfs *fsp, char *errmsg) 2294 { 2295 struct xvfsconf vfc; 2296 2297 if (getvfsbyname(fsp->f_fstypename, &vfc) != 0) { 2298 syslog(LOG_ERR, "getvfsbyname() failed for %s", 2299 fsp->f_fstypename); 2300 return; 2301 } 2302 2303 /* 2304 * We do not need to delete "export" flag from 2305 * filesystems that do not have it set. 2306 */ 2307 if (!(fsp->f_flags & MNT_EXPORTED)) 2308 return; 2309 /* 2310 * Do not delete export for network filesystem by 2311 * passing "export" arg to nmount(). 2312 * It only makes sense to do this for local filesystems. 2313 */ 2314 if (vfc.vfc_flags & VFCF_NETWORK) 2315 return; 2316 2317 iov[1].iov_base = fsp->f_fstypename; 2318 iov[1].iov_len = strlen(fsp->f_fstypename) + 1; 2319 iov[3].iov_base = fsp->f_mntonname; 2320 iov[3].iov_len = strlen(fsp->f_mntonname) + 1; 2321 iov[5].iov_base = fsp->f_mntfromname; 2322 iov[5].iov_len = strlen(fsp->f_mntfromname) + 1; 2323 errmsg[0] = '\0'; 2324 2325 /* 2326 * EXDEV is returned when path exists but is not a 2327 * mount point. May happens if raced with unmount. 2328 */ 2329 if (nmount(iov, iovlen, fsp->f_flags) < 0 && errno != ENOENT && 2330 errno != ENOTSUP && errno != EXDEV) { 2331 syslog(LOG_ERR, 2332 "can't delete exports for %s: %m %s", 2333 fsp->f_mntonname, errmsg); 2334 } 2335 } 2336 2337 /* 2338 * Allocate an export list element 2339 */ 2340 static struct exportlist * 2341 get_exp(void) 2342 { 2343 struct exportlist *ep; 2344 2345 ep = (struct exportlist *)calloc(1, sizeof (struct exportlist)); 2346 if (ep == (struct exportlist *)NULL) 2347 out_of_mem(); 2348 return (ep); 2349 } 2350 2351 /* 2352 * Allocate a group list element 2353 */ 2354 static struct grouplist * 2355 get_grp(void) 2356 { 2357 struct grouplist *gp; 2358 2359 gp = (struct grouplist *)calloc(1, sizeof (struct grouplist)); 2360 if (gp == (struct grouplist *)NULL) 2361 out_of_mem(); 2362 return (gp); 2363 } 2364 2365 /* 2366 * Clean up upon an error in get_exportlist(). 2367 */ 2368 static void 2369 getexp_err(struct exportlist *ep, struct grouplist *grp, const char *reason) 2370 { 2371 struct grouplist *tgrp; 2372 2373 if (!(opt_flags & OP_QUIET)) { 2374 if (reason != NULL) 2375 syslog(LOG_ERR, "bad exports list line '%s': %s", line, 2376 reason); 2377 else 2378 syslog(LOG_ERR, "bad exports list line '%s'", line); 2379 } 2380 if (ep && (ep->ex_flag & EX_LINKED) == 0) 2381 free_exp(ep); 2382 while (grp) { 2383 tgrp = grp; 2384 grp = grp->gr_next; 2385 free_grp(tgrp); 2386 } 2387 } 2388 2389 /* 2390 * Search the export list for a matching fs. 2391 */ 2392 static struct exportlist * 2393 ex_search(fsid_t *fsid, struct exportlisthead *exhp) 2394 { 2395 struct exportlist *ep; 2396 uint32_t i; 2397 2398 i = EXPHASH(fsid); 2399 SLIST_FOREACH(ep, &exhp[i], entries) { 2400 if (fsidcmp(&ep->ex_fs, fsid) == 0) 2401 return (ep); 2402 } 2403 2404 return (ep); 2405 } 2406 2407 /* 2408 * Add a directory path to the list. 2409 */ 2410 static char * 2411 add_expdir(struct dirlist **dpp, char *cp, int len) 2412 { 2413 struct dirlist *dp; 2414 2415 dp = malloc(sizeof (struct dirlist)); 2416 if (dp == (struct dirlist *)NULL) 2417 out_of_mem(); 2418 dp->dp_left = *dpp; 2419 dp->dp_right = (struct dirlist *)NULL; 2420 dp->dp_flag = 0; 2421 dp->dp_hosts = (struct hostlist *)NULL; 2422 dp->dp_dirp = strndup(cp, len); 2423 if (dp->dp_dirp == NULL) 2424 out_of_mem(); 2425 *dpp = dp; 2426 return (dp->dp_dirp); 2427 } 2428 2429 /* 2430 * Hang the dir list element off the dirpath binary tree as required 2431 * and update the entry for host. 2432 */ 2433 static void 2434 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep, 2435 int flags, struct expcred *anoncrp, uint64_t exflags) 2436 { 2437 struct hostlist *hp; 2438 struct dirlist *dp2; 2439 2440 if (flags & OP_ALLDIRS) { 2441 if (ep->ex_defdir) 2442 free((caddr_t)dp); 2443 else 2444 ep->ex_defdir = dp; 2445 if (grp == (struct grouplist *)NULL) { 2446 ep->ex_flag |= EX_DEFSET; 2447 ep->ex_defdir->dp_flag |= DP_DEFSET; 2448 /* Save the default security flavors list. */ 2449 ep->ex_defnumsecflavors = ep->ex_numsecflavors; 2450 if (ep->ex_numsecflavors > 0) 2451 memcpy(ep->ex_defsecflavors, ep->ex_secflavors, 2452 sizeof(ep->ex_secflavors)); 2453 cp_cred(&ep->ex_defanon, anoncrp); 2454 ep->ex_defexflags = exflags; 2455 } else while (grp) { 2456 hp = get_ht(); 2457 hp->ht_grp = grp; 2458 hp->ht_next = ep->ex_defdir->dp_hosts; 2459 ep->ex_defdir->dp_hosts = hp; 2460 /* Save the security flavors list for this host set. */ 2461 grp->gr_numsecflavors = ep->ex_numsecflavors; 2462 if (ep->ex_numsecflavors > 0) 2463 memcpy(grp->gr_secflavors, ep->ex_secflavors, 2464 sizeof(ep->ex_secflavors)); 2465 grp = grp->gr_next; 2466 } 2467 } else { 2468 2469 /* 2470 * Loop through the directories adding them to the tree. 2471 */ 2472 while (dp) { 2473 dp2 = dp->dp_left; 2474 add_dlist(&ep->ex_dirl, dp, grp, flags, ep, anoncrp, 2475 exflags); 2476 dp = dp2; 2477 } 2478 } 2479 } 2480 2481 /* 2482 * Traverse the binary tree either updating a node that is already there 2483 * for the new directory or adding the new node. 2484 */ 2485 static void 2486 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp, 2487 int flags, struct exportlist *ep, struct expcred *anoncrp, 2488 uint64_t exflags) 2489 { 2490 struct dirlist *dp; 2491 struct hostlist *hp; 2492 int cmp; 2493 2494 dp = *dpp; 2495 if (dp) { 2496 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp); 2497 if (cmp > 0) { 2498 add_dlist(&dp->dp_left, newdp, grp, flags, ep, anoncrp, 2499 exflags); 2500 return; 2501 } else if (cmp < 0) { 2502 add_dlist(&dp->dp_right, newdp, grp, flags, ep, anoncrp, 2503 exflags); 2504 return; 2505 } else 2506 free((caddr_t)newdp); 2507 } else { 2508 dp = newdp; 2509 dp->dp_left = (struct dirlist *)NULL; 2510 *dpp = dp; 2511 } 2512 if (grp) { 2513 2514 /* 2515 * Hang all of the host(s) off of the directory point. 2516 */ 2517 do { 2518 hp = get_ht(); 2519 hp->ht_grp = grp; 2520 hp->ht_next = dp->dp_hosts; 2521 dp->dp_hosts = hp; 2522 /* Save the security flavors list for this host set. */ 2523 grp->gr_numsecflavors = ep->ex_numsecflavors; 2524 if (ep->ex_numsecflavors > 0) 2525 memcpy(grp->gr_secflavors, ep->ex_secflavors, 2526 sizeof(ep->ex_secflavors)); 2527 grp = grp->gr_next; 2528 } while (grp); 2529 } else { 2530 ep->ex_flag |= EX_DEFSET; 2531 dp->dp_flag |= DP_DEFSET; 2532 /* Save the default security flavors list. */ 2533 ep->ex_defnumsecflavors = ep->ex_numsecflavors; 2534 if (ep->ex_numsecflavors > 0) 2535 memcpy(ep->ex_defsecflavors, ep->ex_secflavors, 2536 sizeof(ep->ex_secflavors)); 2537 cp_cred(&ep->ex_defanon, anoncrp); 2538 ep->ex_defexflags = exflags; 2539 } 2540 } 2541 2542 /* 2543 * Search for a dirpath on the export point. 2544 */ 2545 static struct dirlist * 2546 dirp_search(struct dirlist *dp, char *dirp) 2547 { 2548 int cmp; 2549 2550 if (dp) { 2551 cmp = strcmp(dp->dp_dirp, dirp); 2552 if (cmp > 0) 2553 return (dirp_search(dp->dp_left, dirp)); 2554 else if (cmp < 0) 2555 return (dirp_search(dp->dp_right, dirp)); 2556 else 2557 return (dp); 2558 } 2559 return (dp); 2560 } 2561 2562 /* 2563 * Scan for a host match in a directory tree. 2564 */ 2565 static int 2566 chk_host(struct dirlist *dp, struct sockaddr *saddr, int *defsetp, 2567 int *hostsetp, int *numsecflavors, int **secflavorsp) 2568 { 2569 struct hostlist *hp; 2570 struct grouplist *grp; 2571 struct addrinfo *ai; 2572 2573 if (dp) { 2574 if (dp->dp_flag & DP_DEFSET) 2575 *defsetp = dp->dp_flag; 2576 hp = dp->dp_hosts; 2577 while (hp) { 2578 grp = hp->ht_grp; 2579 switch (grp->gr_type) { 2580 case GT_HOST: 2581 ai = grp->gr_ptr.gt_addrinfo; 2582 for (; ai; ai = ai->ai_next) { 2583 if (!sacmp(ai->ai_addr, saddr, NULL)) { 2584 *hostsetp = 2585 (hp->ht_flag | DP_HOSTSET); 2586 if (numsecflavors != NULL) { 2587 *numsecflavors = 2588 grp->gr_numsecflavors; 2589 *secflavorsp = 2590 grp->gr_secflavors; 2591 } 2592 return (1); 2593 } 2594 } 2595 break; 2596 case GT_NET: 2597 if (!sacmp(saddr, (struct sockaddr *) 2598 &grp->gr_ptr.gt_net.nt_net, 2599 (struct sockaddr *) 2600 &grp->gr_ptr.gt_net.nt_mask)) { 2601 *hostsetp = (hp->ht_flag | DP_HOSTSET); 2602 if (numsecflavors != NULL) { 2603 *numsecflavors = 2604 grp->gr_numsecflavors; 2605 *secflavorsp = 2606 grp->gr_secflavors; 2607 } 2608 return (1); 2609 } 2610 break; 2611 } 2612 hp = hp->ht_next; 2613 } 2614 } 2615 return (0); 2616 } 2617 2618 /* 2619 * Scan tree for a host that matches the address. 2620 */ 2621 static int 2622 scan_tree(struct dirlist *dp, struct sockaddr *saddr) 2623 { 2624 int defset, hostset; 2625 2626 if (dp) { 2627 if (scan_tree(dp->dp_left, saddr)) 2628 return (1); 2629 if (chk_host(dp, saddr, &defset, &hostset, NULL, NULL)) 2630 return (1); 2631 if (scan_tree(dp->dp_right, saddr)) 2632 return (1); 2633 } 2634 return (0); 2635 } 2636 2637 /* 2638 * Traverse the dirlist tree and free it up. 2639 */ 2640 static void 2641 free_dir(struct dirlist *dp) 2642 { 2643 2644 if (dp) { 2645 free_dir(dp->dp_left); 2646 free_dir(dp->dp_right); 2647 free_host(dp->dp_hosts); 2648 free(dp->dp_dirp); 2649 free(dp); 2650 } 2651 } 2652 2653 /* 2654 * Parse a colon separated list of security flavors 2655 */ 2656 static int 2657 parsesec(char *seclist, struct exportlist *ep) 2658 { 2659 char *cp, savedc; 2660 int flavor; 2661 2662 ep->ex_numsecflavors = 0; 2663 for (;;) { 2664 cp = strchr(seclist, ':'); 2665 if (cp) { 2666 savedc = *cp; 2667 *cp = '\0'; 2668 } 2669 2670 if (!strcmp(seclist, "sys")) 2671 flavor = AUTH_SYS; 2672 else if (!strcmp(seclist, "krb5")) 2673 flavor = RPCSEC_GSS_KRB5; 2674 else if (!strcmp(seclist, "krb5i")) 2675 flavor = RPCSEC_GSS_KRB5I; 2676 else if (!strcmp(seclist, "krb5p")) 2677 flavor = RPCSEC_GSS_KRB5P; 2678 else { 2679 if (cp) 2680 *cp = savedc; 2681 syslog(LOG_ERR, "bad sec flavor: %s", seclist); 2682 return (1); 2683 } 2684 if (ep->ex_numsecflavors == MAXSECFLAVORS) { 2685 if (cp) 2686 *cp = savedc; 2687 syslog(LOG_ERR, "too many sec flavors: %s", seclist); 2688 return (1); 2689 } 2690 ep->ex_secflavors[ep->ex_numsecflavors] = flavor; 2691 ep->ex_numsecflavors++; 2692 if (cp) { 2693 *cp = savedc; 2694 seclist = cp + 1; 2695 } else { 2696 break; 2697 } 2698 } 2699 return (0); 2700 } 2701 2702 /* 2703 * Parse the option string and update fields. 2704 * Option arguments may either be -<option>=<value> or 2705 * -<option> <value> 2706 */ 2707 static int 2708 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp, 2709 int *has_hostp, uint64_t *exflagsp, struct expcred *cr) 2710 { 2711 char *cpoptarg, *cpoptend; 2712 char *cp, *endcp, *cpopt, savedc, savedc2; 2713 int allflag, usedarg; 2714 2715 savedc2 = '\0'; 2716 cpopt = *cpp; 2717 cpopt++; 2718 cp = *endcpp; 2719 savedc = *cp; 2720 *cp = '\0'; 2721 while (cpopt && *cpopt) { 2722 allflag = 1; 2723 usedarg = -2; 2724 if ((cpoptend = strchr(cpopt, ','))) { 2725 *cpoptend++ = '\0'; 2726 if ((cpoptarg = strchr(cpopt, '='))) 2727 *cpoptarg++ = '\0'; 2728 } else { 2729 if ((cpoptarg = strchr(cpopt, '='))) 2730 *cpoptarg++ = '\0'; 2731 else { 2732 *cp = savedc; 2733 nextfield(&cp, &endcp); 2734 **endcpp = '\0'; 2735 if (endcp > cp && *cp != '-') { 2736 cpoptarg = cp; 2737 savedc2 = *endcp; 2738 *endcp = '\0'; 2739 usedarg = 0; 2740 } 2741 } 2742 } 2743 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) { 2744 *exflagsp |= MNT_EXRDONLY; 2745 } else if (cpoptarg && (!strcmp(cpopt, "maproot") || 2746 !(allflag = strcmp(cpopt, "mapall")) || 2747 !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) { 2748 usedarg++; 2749 parsecred(cpoptarg, cr); 2750 if (allflag == 0) { 2751 *exflagsp |= MNT_EXPORTANON; 2752 opt_flags |= OP_MAPALL; 2753 } else 2754 opt_flags |= OP_MAPROOT; 2755 } else if (cpoptarg && (!strcmp(cpopt, "mask") || 2756 !strcmp(cpopt, "m"))) { 2757 if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) { 2758 syslog(LOG_ERR, "bad mask: %s", cpoptarg); 2759 return (1); 2760 } 2761 usedarg++; 2762 opt_flags |= OP_MASK; 2763 } else if (cpoptarg && (!strcmp(cpopt, "network") || 2764 !strcmp(cpopt, "n"))) { 2765 if (strchr(cpoptarg, '/') != NULL) { 2766 if (debug) 2767 fprintf(stderr, "setting OP_MASKLEN\n"); 2768 opt_flags |= OP_MASKLEN; 2769 } 2770 if (grp->gr_type != GT_NULL) { 2771 syslog(LOG_ERR, "network/host conflict"); 2772 return (1); 2773 } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) { 2774 syslog(LOG_ERR, "bad net: %s", cpoptarg); 2775 return (1); 2776 } 2777 grp->gr_type = GT_NET; 2778 *has_hostp = 1; 2779 usedarg++; 2780 opt_flags |= OP_NET; 2781 } else if (!strcmp(cpopt, "alldirs")) { 2782 opt_flags |= OP_ALLDIRS; 2783 } else if (!strcmp(cpopt, "public")) { 2784 *exflagsp |= MNT_EXPUBLIC; 2785 } else if (!strcmp(cpopt, "webnfs")) { 2786 *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON); 2787 opt_flags |= OP_MAPALL; 2788 } else if (cpoptarg && !strcmp(cpopt, "index")) { 2789 ep->ex_indexfile = strdup(cpoptarg); 2790 } else if (!strcmp(cpopt, "quiet")) { 2791 opt_flags |= OP_QUIET; 2792 } else if (cpoptarg && !strcmp(cpopt, "sec")) { 2793 if (parsesec(cpoptarg, ep)) 2794 return (1); 2795 opt_flags |= OP_SEC; 2796 usedarg++; 2797 } else { 2798 syslog(LOG_ERR, "bad opt %s", cpopt); 2799 return (1); 2800 } 2801 if (usedarg >= 0) { 2802 *endcp = savedc2; 2803 **endcpp = savedc; 2804 if (usedarg > 0) { 2805 *cpp = cp; 2806 *endcpp = endcp; 2807 } 2808 return (0); 2809 } 2810 cpopt = cpoptend; 2811 } 2812 **endcpp = savedc; 2813 return (0); 2814 } 2815 2816 /* 2817 * Translate a character string to the corresponding list of network 2818 * addresses for a hostname. 2819 */ 2820 static int 2821 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp) 2822 { 2823 struct grouplist *checkgrp; 2824 struct addrinfo *ai, *tai, hints; 2825 int ecode; 2826 char host[NI_MAXHOST]; 2827 2828 if (grp->gr_type != GT_NULL) { 2829 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp); 2830 return (1); 2831 } 2832 memset(&hints, 0, sizeof hints); 2833 hints.ai_flags = AI_CANONNAME; 2834 hints.ai_protocol = IPPROTO_UDP; 2835 ecode = getaddrinfo(cp, NULL, &hints, &ai); 2836 if (ecode != 0) { 2837 syslog(LOG_ERR,"can't get address info for host %s", cp); 2838 return 1; 2839 } 2840 grp->gr_ptr.gt_addrinfo = ai; 2841 while (ai != NULL) { 2842 if (ai->ai_canonname == NULL) { 2843 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host, 2844 sizeof host, NULL, 0, NI_NUMERICHOST) != 0) 2845 strlcpy(host, "?", sizeof(host)); 2846 ai->ai_canonname = strdup(host); 2847 ai->ai_flags |= AI_CANONNAME; 2848 } 2849 if (debug) 2850 fprintf(stderr, "got host %s\n", ai->ai_canonname); 2851 /* 2852 * Sanity check: make sure we don't already have an entry 2853 * for this host in the grouplist. 2854 */ 2855 for (checkgrp = tgrp; checkgrp != NULL; 2856 checkgrp = checkgrp->gr_next) { 2857 if (checkgrp->gr_type != GT_HOST) 2858 continue; 2859 for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL; 2860 tai = tai->ai_next) { 2861 if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0) 2862 continue; 2863 if (debug) 2864 fprintf(stderr, 2865 "ignoring duplicate host %s\n", 2866 ai->ai_canonname); 2867 grp->gr_type = GT_IGNORE; 2868 return (0); 2869 } 2870 } 2871 ai = ai->ai_next; 2872 } 2873 grp->gr_type = GT_HOST; 2874 return (0); 2875 } 2876 2877 /* 2878 * Free up an exports list component 2879 */ 2880 static void 2881 free_exp(struct exportlist *ep) 2882 { 2883 struct grouplist *grp, *tgrp; 2884 2885 if (ep->ex_defdir) { 2886 free_host(ep->ex_defdir->dp_hosts); 2887 free((caddr_t)ep->ex_defdir); 2888 } 2889 if (ep->ex_fsdir) 2890 free(ep->ex_fsdir); 2891 if (ep->ex_indexfile) 2892 free(ep->ex_indexfile); 2893 free_dir(ep->ex_dirl); 2894 grp = ep->ex_grphead; 2895 while (grp) { 2896 tgrp = grp; 2897 grp = grp->gr_next; 2898 free_grp(tgrp); 2899 } 2900 free((caddr_t)ep); 2901 } 2902 2903 /* 2904 * Free up the v4root exports. 2905 */ 2906 static void 2907 free_v4rootexp(void) 2908 { 2909 2910 if (v4root_ep != NULL) { 2911 free_exp(v4root_ep); 2912 v4root_ep = NULL; 2913 } 2914 } 2915 2916 /* 2917 * Free hosts. 2918 */ 2919 static void 2920 free_host(struct hostlist *hp) 2921 { 2922 struct hostlist *hp2; 2923 2924 while (hp) { 2925 hp2 = hp; 2926 hp = hp->ht_next; 2927 free((caddr_t)hp2); 2928 } 2929 } 2930 2931 static struct hostlist * 2932 get_ht(void) 2933 { 2934 struct hostlist *hp; 2935 2936 hp = (struct hostlist *)malloc(sizeof (struct hostlist)); 2937 if (hp == (struct hostlist *)NULL) 2938 out_of_mem(); 2939 hp->ht_next = (struct hostlist *)NULL; 2940 hp->ht_flag = 0; 2941 return (hp); 2942 } 2943 2944 /* 2945 * Out of memory, fatal 2946 */ 2947 static void 2948 out_of_mem(void) 2949 { 2950 2951 syslog(LOG_ERR, "out of memory"); 2952 exit(2); 2953 } 2954 2955 /* 2956 * Call do_mount() from the struct exportlist, for each case needed. 2957 */ 2958 static int 2959 do_export_mount(struct exportlist *ep, struct statfs *fsp) 2960 { 2961 struct grouplist *grp, defgrp; 2962 int ret; 2963 size_t dirlen; 2964 2965 LOGDEBUG("do_export_mount=%s", ep->ex_fsdir); 2966 dirlen = strlen(ep->ex_fsdir); 2967 if ((ep->ex_flag & EX_DEFSET) != 0) { 2968 defgrp.gr_type = GT_DEFAULT; 2969 defgrp.gr_next = NULL; 2970 /* We have an entry for all other hosts/nets. */ 2971 LOGDEBUG("ex_defexflags=0x%jx", (uintmax_t)ep->ex_defexflags); 2972 ret = do_mount(ep, &defgrp, ep->ex_defexflags, &ep->ex_defanon, 2973 ep->ex_fsdir, dirlen, fsp, ep->ex_defnumsecflavors, 2974 ep->ex_defsecflavors); 2975 if (ret != 0) 2976 return (ret); 2977 } 2978 2979 /* Do a mount for each group. */ 2980 grp = ep->ex_grphead; 2981 while (grp != NULL) { 2982 LOGDEBUG("do mount gr_type=0x%x gr_exflags=0x%jx", 2983 grp->gr_type, (uintmax_t)grp->gr_exflags); 2984 ret = do_mount(ep, grp, grp->gr_exflags, &grp->gr_anon, 2985 ep->ex_fsdir, dirlen, fsp, grp->gr_numsecflavors, 2986 grp->gr_secflavors); 2987 if (ret != 0) 2988 return (ret); 2989 grp = grp->gr_next; 2990 } 2991 return (0); 2992 } 2993 2994 /* 2995 * Do the nmount() syscall with the update flag to push the export info into 2996 * the kernel. 2997 */ 2998 static int 2999 do_mount(struct exportlist *ep, struct grouplist *grp, uint64_t exflags, 3000 struct expcred *anoncrp, char *dirp, int dirplen, struct statfs *fsb, 3001 int numsecflavors, int *secflavors) 3002 { 3003 struct statfs fsb1; 3004 struct addrinfo *ai; 3005 struct export_args *eap; 3006 char errmsg[255]; 3007 char *cp; 3008 int done; 3009 char savedc; 3010 struct iovec *iov; 3011 int i, iovlen; 3012 int ret; 3013 struct nfsex_args nfsea; 3014 3015 eap = &nfsea.export; 3016 3017 cp = NULL; 3018 savedc = '\0'; 3019 iov = NULL; 3020 iovlen = 0; 3021 ret = 0; 3022 3023 bzero(eap, sizeof (struct export_args)); 3024 bzero(errmsg, sizeof(errmsg)); 3025 eap->ex_flags = exflags; 3026 eap->ex_uid = anoncrp->cr_uid; 3027 eap->ex_ngroups = anoncrp->cr_ngroups; 3028 if (eap->ex_ngroups > 0) { 3029 eap->ex_groups = malloc(eap->ex_ngroups * sizeof(gid_t)); 3030 memcpy(eap->ex_groups, anoncrp->cr_groups, eap->ex_ngroups * 3031 sizeof(gid_t)); 3032 } 3033 LOGDEBUG("do_mount exflags=0x%jx", (uintmax_t)exflags); 3034 eap->ex_indexfile = ep->ex_indexfile; 3035 if (grp->gr_type == GT_HOST) 3036 ai = grp->gr_ptr.gt_addrinfo; 3037 else 3038 ai = NULL; 3039 eap->ex_numsecflavors = numsecflavors; 3040 LOGDEBUG("do_mount numsec=%d", numsecflavors); 3041 for (i = 0; i < eap->ex_numsecflavors; i++) 3042 eap->ex_secflavors[i] = secflavors[i]; 3043 if (eap->ex_numsecflavors == 0) { 3044 eap->ex_numsecflavors = 1; 3045 eap->ex_secflavors[0] = AUTH_SYS; 3046 } 3047 done = FALSE; 3048 3049 if (v4root_phase == 0) { 3050 build_iovec(&iov, &iovlen, "fstype", NULL, 0); 3051 build_iovec(&iov, &iovlen, "fspath", NULL, 0); 3052 build_iovec(&iov, &iovlen, "from", NULL, 0); 3053 build_iovec(&iov, &iovlen, "update", NULL, 0); 3054 build_iovec(&iov, &iovlen, "export", eap, 3055 sizeof (struct export_args)); 3056 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg)); 3057 } 3058 3059 while (!done) { 3060 switch (grp->gr_type) { 3061 case GT_HOST: 3062 if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0) 3063 goto skip; 3064 eap->ex_addr = ai->ai_addr; 3065 eap->ex_addrlen = ai->ai_addrlen; 3066 eap->ex_masklen = 0; 3067 break; 3068 case GT_NET: 3069 if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 && 3070 have_v6 == 0) 3071 goto skip; 3072 eap->ex_addr = 3073 (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net; 3074 eap->ex_addrlen = 3075 ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_net)->sa_len; 3076 eap->ex_mask = 3077 (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask; 3078 eap->ex_masklen = ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask)->sa_len; 3079 break; 3080 case GT_DEFAULT: 3081 eap->ex_addr = NULL; 3082 eap->ex_addrlen = 0; 3083 eap->ex_mask = NULL; 3084 eap->ex_masklen = 0; 3085 break; 3086 case GT_IGNORE: 3087 ret = 0; 3088 goto error_exit; 3089 break; 3090 default: 3091 syslog(LOG_ERR, "bad grouptype"); 3092 if (cp) 3093 *cp = savedc; 3094 ret = 1; 3095 goto error_exit; 3096 } 3097 3098 /* 3099 * For V4:, use the nfssvc() syscall, instead of mount(). 3100 */ 3101 if (v4root_phase == 2) { 3102 nfsea.fspec = v4root_dirpath; 3103 if (nfssvc(NFSSVC_V4ROOTEXPORT | NFSSVC_NEWSTRUCT, 3104 (caddr_t)&nfsea) < 0) { 3105 syslog(LOG_ERR, "Exporting V4: failed"); 3106 ret = 2; 3107 goto error_exit; 3108 } 3109 } else { 3110 /* 3111 * XXX: 3112 * Maybe I should just use the fsb->f_mntonname path 3113 * instead of looping back up the dirp to the mount 3114 * point?? 3115 * Also, needs to know how to export all types of local 3116 * exportable filesystems and not just "ufs". 3117 */ 3118 iov[1].iov_base = fsb->f_fstypename; /* "fstype" */ 3119 iov[1].iov_len = strlen(fsb->f_fstypename) + 1; 3120 iov[3].iov_base = fsb->f_mntonname; /* "fspath" */ 3121 iov[3].iov_len = strlen(fsb->f_mntonname) + 1; 3122 iov[5].iov_base = fsb->f_mntfromname; /* "from" */ 3123 iov[5].iov_len = strlen(fsb->f_mntfromname) + 1; 3124 errmsg[0] = '\0'; 3125 3126 while (nmount(iov, iovlen, fsb->f_flags) < 0) { 3127 if (cp) 3128 *cp-- = savedc; 3129 else 3130 cp = dirp + dirplen - 1; 3131 if (opt_flags & OP_QUIET) { 3132 ret = 1; 3133 goto error_exit; 3134 } 3135 if (errno == EPERM) { 3136 if (debug) 3137 warnx("can't change attributes for %s: %s", 3138 dirp, errmsg); 3139 syslog(LOG_ERR, 3140 "can't change attributes for %s: %s", 3141 dirp, errmsg); 3142 ret = 1; 3143 goto error_exit; 3144 } 3145 if (opt_flags & OP_ALLDIRS) { 3146 if (errno == EINVAL) 3147 syslog(LOG_ERR, 3148 "-alldirs requested but %s is not a filesystem mountpoint", 3149 dirp); 3150 else 3151 syslog(LOG_ERR, 3152 "could not remount %s: %m", 3153 dirp); 3154 ret = 1; 3155 goto error_exit; 3156 } 3157 /* back up over the last component */ 3158 while (*cp == '/' && cp > dirp) 3159 cp--; 3160 while (*(cp - 1) != '/' && cp > dirp) 3161 cp--; 3162 if (cp == dirp) { 3163 if (debug) 3164 warnx("mnt unsucc"); 3165 syslog(LOG_ERR, "can't export %s %s", 3166 dirp, errmsg); 3167 ret = 1; 3168 goto error_exit; 3169 } 3170 savedc = *cp; 3171 *cp = '\0'; 3172 /* 3173 * Check that we're still on the same 3174 * filesystem. 3175 */ 3176 if (statfs(dirp, &fsb1) != 0 || 3177 fsidcmp(&fsb1.f_fsid, &fsb->f_fsid) != 0) { 3178 *cp = savedc; 3179 syslog(LOG_ERR, 3180 "can't export %s %s", dirp, 3181 errmsg); 3182 ret = 1; 3183 goto error_exit; 3184 } 3185 } 3186 } 3187 3188 /* 3189 * For the experimental server: 3190 * If this is the public directory, get the file handle 3191 * and load it into the kernel via the nfssvc() syscall. 3192 */ 3193 if ((exflags & MNT_EXPUBLIC) != 0) { 3194 fhandle_t fh; 3195 char *public_name; 3196 3197 if (eap->ex_indexfile != NULL) 3198 public_name = eap->ex_indexfile; 3199 else 3200 public_name = dirp; 3201 if (getfh(public_name, &fh) < 0) 3202 syslog(LOG_ERR, 3203 "Can't get public fh for %s", public_name); 3204 else if (nfssvc(NFSSVC_PUBLICFH, (caddr_t)&fh) < 0) 3205 syslog(LOG_ERR, 3206 "Can't set public fh for %s", public_name); 3207 else { 3208 has_publicfh = 1; 3209 has_set_publicfh = 1; 3210 ep->ex_flag |= EX_PUBLICFH; 3211 } 3212 } 3213 skip: 3214 if (ai != NULL) 3215 ai = ai->ai_next; 3216 if (ai == NULL) 3217 done = TRUE; 3218 } 3219 if (cp) 3220 *cp = savedc; 3221 error_exit: 3222 free(eap->ex_groups); 3223 /* free strings allocated by strdup() in getmntopts.c */ 3224 if (iov != NULL) { 3225 free(iov[0].iov_base); /* fstype */ 3226 free(iov[2].iov_base); /* fspath */ 3227 free(iov[4].iov_base); /* from */ 3228 free(iov[6].iov_base); /* update */ 3229 free(iov[8].iov_base); /* export */ 3230 free(iov[10].iov_base); /* errmsg */ 3231 3232 /* free iov, allocated by realloc() */ 3233 free(iov); 3234 } 3235 return (ret); 3236 } 3237 3238 /* 3239 * Translate a net address. 3240 * 3241 * If `maskflg' is nonzero, then `cp' is a netmask, not a network address. 3242 */ 3243 static int 3244 get_net(char *cp, struct netmsk *net, int maskflg) 3245 { 3246 struct netent *np = NULL; 3247 char *name, *p, *prefp; 3248 struct sockaddr_in sin; 3249 struct sockaddr *sa = NULL; 3250 struct addrinfo hints, *ai = NULL; 3251 char netname[NI_MAXHOST]; 3252 long preflen; 3253 3254 p = prefp = NULL; 3255 if ((opt_flags & OP_MASKLEN) && !maskflg) { 3256 p = strchr(cp, '/'); 3257 *p = '\0'; 3258 prefp = p + 1; 3259 } 3260 3261 /* 3262 * Check for a numeric address first. We wish to avoid 3263 * possible DNS lookups in getnetbyname(). 3264 */ 3265 if (isxdigit(*cp) || *cp == ':') { 3266 memset(&hints, 0, sizeof hints); 3267 /* Ensure the mask and the network have the same family. */ 3268 if (maskflg && (opt_flags & OP_NET)) 3269 hints.ai_family = net->nt_net.ss_family; 3270 else if (!maskflg && (opt_flags & OP_HAVEMASK)) 3271 hints.ai_family = net->nt_mask.ss_family; 3272 else 3273 hints.ai_family = AF_UNSPEC; 3274 hints.ai_flags = AI_NUMERICHOST; 3275 if (getaddrinfo(cp, NULL, &hints, &ai) == 0) 3276 sa = ai->ai_addr; 3277 if (sa != NULL && ai->ai_family == AF_INET) { 3278 /* 3279 * The address in `cp' is really a network address, so 3280 * use inet_network() to re-interpret this correctly. 3281 * e.g. "127.1" means 127.1.0.0, not 127.0.0.1. 3282 */ 3283 bzero(&sin, sizeof sin); 3284 sin.sin_family = AF_INET; 3285 sin.sin_len = sizeof sin; 3286 sin.sin_addr = inet_makeaddr(inet_network(cp), 0); 3287 if (debug) 3288 fprintf(stderr, "get_net: v4 addr %s\n", 3289 inet_ntoa(sin.sin_addr)); 3290 sa = (struct sockaddr *)&sin; 3291 } 3292 } 3293 if (sa == NULL && (np = getnetbyname(cp)) != NULL) { 3294 bzero(&sin, sizeof sin); 3295 sin.sin_family = AF_INET; 3296 sin.sin_len = sizeof sin; 3297 sin.sin_addr = inet_makeaddr(np->n_net, 0); 3298 sa = (struct sockaddr *)&sin; 3299 } 3300 if (sa == NULL) 3301 goto fail; 3302 3303 if (maskflg) { 3304 /* The specified sockaddr is a mask. */ 3305 if (checkmask(sa) != 0) 3306 goto fail; 3307 bcopy(sa, &net->nt_mask, sa->sa_len); 3308 opt_flags |= OP_HAVEMASK; 3309 } else { 3310 /* The specified sockaddr is a network address. */ 3311 bcopy(sa, &net->nt_net, sa->sa_len); 3312 3313 /* Get a network name for the export list. */ 3314 if (np) { 3315 name = np->n_name; 3316 } else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname, 3317 NULL, 0, NI_NUMERICHOST) == 0) { 3318 name = netname; 3319 } else { 3320 goto fail; 3321 } 3322 if ((net->nt_name = strdup(name)) == NULL) 3323 out_of_mem(); 3324 3325 /* 3326 * Extract a mask from either a "/<masklen>" suffix, or 3327 * from the class of an IPv4 address. 3328 */ 3329 if (opt_flags & OP_MASKLEN) { 3330 preflen = strtol(prefp, NULL, 10); 3331 if (preflen < 0L || preflen == LONG_MAX) 3332 goto fail; 3333 bcopy(sa, &net->nt_mask, sa->sa_len); 3334 if (makemask(&net->nt_mask, (int)preflen) != 0) 3335 goto fail; 3336 opt_flags |= OP_HAVEMASK; 3337 *p = '/'; 3338 } else if (sa->sa_family == AF_INET && 3339 (opt_flags & OP_MASK) == 0) { 3340 in_addr_t addr; 3341 3342 addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr; 3343 if (IN_CLASSA(addr)) 3344 preflen = 8; 3345 else if (IN_CLASSB(addr)) 3346 preflen = 16; 3347 else if (IN_CLASSC(addr)) 3348 preflen = 24; 3349 else if (IN_CLASSD(addr)) 3350 preflen = 28; 3351 else 3352 preflen = 32; /* XXX */ 3353 3354 bcopy(sa, &net->nt_mask, sa->sa_len); 3355 makemask(&net->nt_mask, (int)preflen); 3356 opt_flags |= OP_HAVEMASK; 3357 } 3358 } 3359 3360 if (ai) 3361 freeaddrinfo(ai); 3362 return 0; 3363 3364 fail: 3365 if (ai) 3366 freeaddrinfo(ai); 3367 return 1; 3368 } 3369 3370 /* 3371 * Parse out the next white space separated field 3372 */ 3373 static void 3374 nextfield(char **cp, char **endcp) 3375 { 3376 char *p; 3377 char quot = 0; 3378 3379 p = *cp; 3380 while (*p == ' ' || *p == '\t') 3381 p++; 3382 *cp = p; 3383 while (*p != '\0') { 3384 if (quot) { 3385 if (*p == quot) 3386 quot = 0; 3387 } else { 3388 if (*p == '\\' && *(p + 1) != '\0') 3389 p++; 3390 else if (*p == '\'' || *p == '"') 3391 quot = *p; 3392 else if (*p == ' ' || *p == '\t') 3393 break; 3394 } 3395 p++; 3396 }; 3397 *endcp = p; 3398 } 3399 3400 /* 3401 * Get an exports file line. Skip over blank lines and handle line 3402 * continuations. 3403 */ 3404 static int 3405 get_line(void) 3406 { 3407 char *p, *cp; 3408 size_t len; 3409 int totlen, cont_line; 3410 3411 /* 3412 * Loop around ignoring blank lines and getting all continuation lines. 3413 */ 3414 p = line; 3415 totlen = 0; 3416 do { 3417 if ((p = fgetln(exp_file, &len)) == NULL) 3418 return (0); 3419 cp = p + len - 1; 3420 cont_line = 0; 3421 while (cp >= p && 3422 (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) { 3423 if (*cp == '\\') 3424 cont_line = 1; 3425 cp--; 3426 len--; 3427 } 3428 if (cont_line) { 3429 *++cp = ' '; 3430 len++; 3431 } 3432 if (linesize < len + totlen + 1) { 3433 linesize = len + totlen + 1; 3434 line = realloc(line, linesize); 3435 if (line == NULL) 3436 out_of_mem(); 3437 } 3438 memcpy(line + totlen, p, len); 3439 totlen += len; 3440 line[totlen] = '\0'; 3441 } while (totlen == 0 || cont_line); 3442 return (1); 3443 } 3444 3445 /* 3446 * Parse a description of a credential. 3447 */ 3448 static void 3449 parsecred(char *namelist, struct expcred *cr) 3450 { 3451 char *name; 3452 int cnt; 3453 char *names; 3454 struct passwd *pw; 3455 struct group *gr; 3456 3457 /* 3458 * Set up the unprivileged user. 3459 */ 3460 cr->cr_uid = UID_NOBODY; 3461 cr->cr_groups[0] = GID_NOGROUP; 3462 cr->cr_ngroups = 1; 3463 /* 3464 * Get the user's password table entry. 3465 */ 3466 names = namelist; 3467 name = strsep_quote(&names, ":"); 3468 /* Bug? name could be NULL here */ 3469 if (isdigit(*name) || *name == '-') 3470 pw = getpwuid(atoi(name)); 3471 else 3472 pw = getpwnam(name); 3473 /* 3474 * Credentials specified as those of a user. 3475 */ 3476 if (names == NULL) { 3477 if (pw == NULL) { 3478 syslog(LOG_ERR, "unknown user: %s", name); 3479 return; 3480 } 3481 cr->cr_uid = pw->pw_uid; 3482 cr->cr_ngroups = NGROUPS_MAX + 1; 3483 if (getgrouplist(pw->pw_name, pw->pw_gid, cr->cr_groups, 3484 &cr->cr_ngroups)) { 3485 syslog(LOG_ERR, "too many groups"); 3486 cr->cr_ngroups = NGROUPS_MAX + 1; 3487 } 3488 3489 /* 3490 * Compress out duplicate. 3491 */ 3492 if (cr->cr_ngroups > 1 && cr->cr_groups[0] == 3493 cr->cr_groups[1]) { 3494 for (cnt = 2; cnt < cr->cr_ngroups; cnt++) 3495 cr->cr_groups[cnt - 1] = cr->cr_groups[cnt]; 3496 cr->cr_ngroups--; 3497 } 3498 if (cr->cr_ngroups > NGROUPS_MAX) 3499 cr->cr_ngroups = NGROUPS_MAX; 3500 return; 3501 } 3502 /* 3503 * Explicit credential specified as a colon separated list: 3504 * uid:gid:gid:... 3505 */ 3506 if (pw != NULL) 3507 cr->cr_uid = pw->pw_uid; 3508 else if (isdigit(*name) || *name == '-') 3509 cr->cr_uid = atoi(name); 3510 else { 3511 syslog(LOG_ERR, "unknown user: %s", name); 3512 return; 3513 } 3514 cr->cr_ngroups = 0; 3515 while (names != NULL && *names != '\0' && cr->cr_ngroups < NGROUPS_MAX) { 3516 name = strsep_quote(&names, ":"); 3517 if (isdigit(*name) || *name == '-') { 3518 cr->cr_groups[cr->cr_ngroups++] = atoi(name); 3519 } else { 3520 if ((gr = getgrnam(name)) == NULL) { 3521 syslog(LOG_ERR, "unknown group: %s", name); 3522 continue; 3523 } 3524 cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid; 3525 } 3526 } 3527 if (names != NULL && *names != '\0' && cr->cr_ngroups == NGROUPS_MAX) 3528 syslog(LOG_ERR, "too many groups"); 3529 } 3530 3531 #define STRSIZ (MNTNAMLEN+MNTPATHLEN+50) 3532 /* 3533 * Routines that maintain the remote mounttab 3534 */ 3535 static void 3536 get_mountlist(void) 3537 { 3538 struct mountlist *mlp; 3539 char *host, *dirp, *cp; 3540 char str[STRSIZ]; 3541 FILE *mlfile; 3542 3543 if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) { 3544 if (errno == ENOENT) 3545 return; 3546 else { 3547 syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST); 3548 return; 3549 } 3550 } 3551 while (fgets(str, STRSIZ, mlfile) != NULL) { 3552 cp = str; 3553 host = strsep(&cp, " \t\n"); 3554 dirp = strsep(&cp, " \t\n"); 3555 if (host == NULL || dirp == NULL) 3556 continue; 3557 mlp = (struct mountlist *)malloc(sizeof (*mlp)); 3558 if (mlp == (struct mountlist *)NULL) 3559 out_of_mem(); 3560 strncpy(mlp->ml_host, host, MNTNAMLEN); 3561 mlp->ml_host[MNTNAMLEN] = '\0'; 3562 strncpy(mlp->ml_dirp, dirp, MNTPATHLEN); 3563 mlp->ml_dirp[MNTPATHLEN] = '\0'; 3564 3565 SLIST_INSERT_HEAD(&mlhead, mlp, next); 3566 } 3567 fclose(mlfile); 3568 } 3569 3570 static void 3571 del_mlist(char *hostp, char *dirp) 3572 { 3573 struct mountlist *mlp, *mlp2; 3574 FILE *mlfile; 3575 int fnd = 0; 3576 3577 SLIST_FOREACH_SAFE(mlp, &mlhead, next, mlp2) { 3578 if (!strcmp(mlp->ml_host, hostp) && 3579 (!dirp || !strcmp(mlp->ml_dirp, dirp))) { 3580 fnd = 1; 3581 SLIST_REMOVE(&mlhead, mlp, mountlist, next); 3582 free((caddr_t)mlp); 3583 } 3584 } 3585 if (fnd) { 3586 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) { 3587 syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST); 3588 return; 3589 } 3590 SLIST_FOREACH(mlp, &mlhead, next) { 3591 fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp); 3592 } 3593 fclose(mlfile); 3594 } 3595 } 3596 3597 static void 3598 add_mlist(char *hostp, char *dirp) 3599 { 3600 struct mountlist *mlp; 3601 FILE *mlfile; 3602 3603 SLIST_FOREACH(mlp, &mlhead, next) { 3604 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp)) 3605 return; 3606 } 3607 3608 mlp = (struct mountlist *)malloc(sizeof (*mlp)); 3609 if (mlp == (struct mountlist *)NULL) 3610 out_of_mem(); 3611 strncpy(mlp->ml_host, hostp, MNTNAMLEN); 3612 mlp->ml_host[MNTNAMLEN] = '\0'; 3613 strncpy(mlp->ml_dirp, dirp, MNTPATHLEN); 3614 mlp->ml_dirp[MNTPATHLEN] = '\0'; 3615 SLIST_INSERT_HEAD(&mlhead, mlp, next); 3616 if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) { 3617 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST); 3618 return; 3619 } 3620 fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp); 3621 fclose(mlfile); 3622 } 3623 3624 /* 3625 * Free up a group list. 3626 */ 3627 static void 3628 free_grp(struct grouplist *grp) 3629 { 3630 if (grp->gr_type == GT_HOST) { 3631 if (grp->gr_ptr.gt_addrinfo != NULL) 3632 freeaddrinfo(grp->gr_ptr.gt_addrinfo); 3633 } else if (grp->gr_type == GT_NET) { 3634 if (grp->gr_ptr.gt_net.nt_name) 3635 free(grp->gr_ptr.gt_net.nt_name); 3636 } 3637 free((caddr_t)grp); 3638 } 3639 3640 #ifdef DEBUG 3641 static void 3642 SYSLOG(int pri, const char *fmt, ...) 3643 { 3644 va_list ap; 3645 3646 va_start(ap, fmt); 3647 vfprintf(stderr, fmt, ap); 3648 va_end(ap); 3649 } 3650 #endif /* DEBUG */ 3651 3652 /* 3653 * Check options for consistency. 3654 */ 3655 static int 3656 check_options(struct dirlist *dp) 3657 { 3658 3659 if (v4root_phase == 0 && dp == NULL) 3660 return (1); 3661 if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL)) { 3662 syslog(LOG_ERR, "-mapall and -maproot mutually exclusive"); 3663 return (1); 3664 } 3665 if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) { 3666 syslog(LOG_ERR, "-mask requires -network"); 3667 return (1); 3668 } 3669 if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) { 3670 syslog(LOG_ERR, "-network requires mask specification"); 3671 return (1); 3672 } 3673 if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) { 3674 syslog(LOG_ERR, "-mask and /masklen are mutually exclusive"); 3675 return (1); 3676 } 3677 if (v4root_phase > 0 && 3678 (opt_flags & 3679 ~(OP_SEC | OP_MASK | OP_NET | OP_HAVEMASK | OP_MASKLEN)) != 0) { 3680 syslog(LOG_ERR,"only -sec,-net,-mask options allowed on V4:"); 3681 return (1); 3682 } 3683 if ((opt_flags & OP_ALLDIRS) && dp->dp_left) { 3684 syslog(LOG_ERR, "-alldirs has multiple directories"); 3685 return (1); 3686 } 3687 return (0); 3688 } 3689 3690 /* 3691 * Check an absolute directory path for any symbolic links. Return true 3692 */ 3693 static int 3694 check_dirpath(char *dirp) 3695 { 3696 char *cp; 3697 int ret = 1; 3698 struct stat sb; 3699 3700 cp = dirp + 1; 3701 while (*cp && ret) { 3702 if (*cp == '/') { 3703 *cp = '\0'; 3704 if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode)) 3705 ret = 0; 3706 *cp = '/'; 3707 } 3708 cp++; 3709 } 3710 if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode)) 3711 ret = 0; 3712 return (ret); 3713 } 3714 3715 /* 3716 * Make a netmask according to the specified prefix length. The ss_family 3717 * and other non-address fields must be initialised before calling this. 3718 */ 3719 static int 3720 makemask(struct sockaddr_storage *ssp, int bitlen) 3721 { 3722 u_char *p; 3723 int bits, i, len; 3724 3725 if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL) 3726 return (-1); 3727 if (bitlen > len * CHAR_BIT) 3728 return (-1); 3729 3730 for (i = 0; i < len; i++) { 3731 bits = MIN(CHAR_BIT, bitlen); 3732 *p++ = (u_char)~0 << (CHAR_BIT - bits); 3733 bitlen -= bits; 3734 } 3735 return 0; 3736 } 3737 3738 /* 3739 * Check that the sockaddr is a valid netmask. Returns 0 if the mask 3740 * is acceptable (i.e. of the form 1...10....0). 3741 */ 3742 static int 3743 checkmask(struct sockaddr *sa) 3744 { 3745 u_char *mask; 3746 int i, len; 3747 3748 if ((mask = sa_rawaddr(sa, &len)) == NULL) 3749 return (-1); 3750 3751 for (i = 0; i < len; i++) 3752 if (mask[i] != 0xff) 3753 break; 3754 if (i < len) { 3755 if (~mask[i] & (u_char)(~mask[i] + 1)) 3756 return (-1); 3757 i++; 3758 } 3759 for (; i < len; i++) 3760 if (mask[i] != 0) 3761 return (-1); 3762 return (0); 3763 } 3764 3765 /* 3766 * Compare two sockaddrs according to a specified mask. Return zero if 3767 * `sa1' matches `sa2' when filtered by the netmask in `samask'. 3768 * If samask is NULL, perform a full comparison. 3769 */ 3770 static int 3771 sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask) 3772 { 3773 unsigned char *p1, *p2, *mask; 3774 int len, i; 3775 3776 if (sa1->sa_family != sa2->sa_family || 3777 (p1 = sa_rawaddr(sa1, &len)) == NULL || 3778 (p2 = sa_rawaddr(sa2, NULL)) == NULL) 3779 return (1); 3780 3781 switch (sa1->sa_family) { 3782 case AF_INET6: 3783 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id != 3784 ((struct sockaddr_in6 *)sa2)->sin6_scope_id) 3785 return (1); 3786 break; 3787 } 3788 3789 /* Simple binary comparison if no mask specified. */ 3790 if (samask == NULL) 3791 return (memcmp(p1, p2, len)); 3792 3793 /* Set up the mask, and do a mask-based comparison. */ 3794 if (sa1->sa_family != samask->sa_family || 3795 (mask = sa_rawaddr(samask, NULL)) == NULL) 3796 return (1); 3797 3798 for (i = 0; i < len; i++) 3799 if ((p1[i] & mask[i]) != (p2[i] & mask[i])) 3800 return (1); 3801 return (0); 3802 } 3803 3804 /* 3805 * Return a pointer to the part of the sockaddr that contains the 3806 * raw address, and set *nbytes to its length in bytes. Returns 3807 * NULL if the address family is unknown. 3808 */ 3809 static void * 3810 sa_rawaddr(struct sockaddr *sa, int *nbytes) { 3811 void *p; 3812 int len; 3813 3814 switch (sa->sa_family) { 3815 case AF_INET: 3816 len = sizeof(((struct sockaddr_in *)sa)->sin_addr); 3817 p = &((struct sockaddr_in *)sa)->sin_addr; 3818 break; 3819 case AF_INET6: 3820 len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr); 3821 p = &((struct sockaddr_in6 *)sa)->sin6_addr; 3822 break; 3823 default: 3824 p = NULL; 3825 len = 0; 3826 } 3827 3828 if (nbytes != NULL) 3829 *nbytes = len; 3830 return (p); 3831 } 3832 3833 static void 3834 huphandler(int sig __unused) 3835 { 3836 3837 got_sighup = 1; 3838 } 3839 3840 static void 3841 terminate(int sig __unused) 3842 { 3843 pidfile_remove(pfh); 3844 rpcb_unset(MOUNTPROG, MOUNTVERS, NULL); 3845 rpcb_unset(MOUNTPROG, MOUNTVERS3, NULL); 3846 exit (0); 3847 } 3848 3849 static void 3850 cp_cred(struct expcred *outcr, struct expcred *incr) 3851 { 3852 3853 outcr->cr_uid = incr->cr_uid; 3854 outcr->cr_ngroups = incr->cr_ngroups; 3855 memcpy(outcr->cr_groups, incr->cr_groups, incr->cr_ngroups * 3856 sizeof(gid_t)); 3857 } 3858