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