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