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