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 * @(#) Copyright (c) 1989, 1993 The Regents of the University of California. All rights reserved. 33 * @(#)mountd.c 8.15 (Berkeley) 5/1/95 34 * $FreeBSD: head/usr.sbin/mountd/mountd.c 173056 2007-10-27 12:24:47Z simon $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/module.h> 39 #include <sys/mount.h> 40 #include <sys/mountctl.h> 41 #include <sys/fcntl.h> 42 #include <sys/linker.h> 43 #include <sys/stat.h> 44 #include <sys/syslog.h> 45 #include <sys/sysctl.h> 46 47 #include <rpc/rpc.h> 48 #include <rpc/rpc_com.h> 49 #include <rpcsvc/mount.h> 50 #include <vfs/nfs/rpcv2.h> 51 #include <vfs/nfs/nfsproto.h> 52 #include <vfs/nfs/nfs.h> 53 #include <vfs/ufs/ufsmount.h> 54 #include <vfs/msdosfs/msdosfsmount.h> 55 #include <vfs/ntfs/ntfsmount.h> 56 #include <vfs/isofs/cd9660/cd9660_mount.h> /* XXX need isofs in include */ 57 58 #include <arpa/inet.h> 59 60 #include <ctype.h> 61 #include <err.h> 62 #include <errno.h> 63 #include <grp.h> 64 #include <limits.h> 65 #include <libutil.h> 66 #include <netdb.h> 67 #include <pwd.h> 68 #include <signal.h> 69 #include <stdio.h> 70 #include <stdlib.h> 71 #include <string.h> 72 #include <unistd.h> 73 #include "pathnames.h" 74 75 #ifdef DEBUG 76 #include <stdarg.h> 77 #endif 78 79 /* 80 * Structures for keeping the mount list and export list 81 */ 82 struct mountlist { 83 struct mountlist *ml_next; 84 char ml_host[RPCMNT_NAMELEN+1]; 85 char ml_dirp[RPCMNT_PATHLEN+1]; 86 }; 87 88 struct dirlist { 89 struct dirlist *dp_left; 90 struct dirlist *dp_right; 91 int dp_flag; 92 struct hostlist *dp_hosts; /* List of hosts this dir exported to */ 93 char *dp_dirp; 94 }; 95 /* dp_flag bits */ 96 #define DP_DEFSET 0x1 97 #define DP_HOSTSET 0x2 98 99 struct exportlist { 100 struct exportlist *ex_next; 101 struct dirlist *ex_dirl; 102 struct dirlist *ex_defdir; 103 int ex_flag; 104 fsid_t ex_fs; 105 char *ex_fsdir; 106 char *ex_indexfile; 107 }; 108 /* ex_flag bits */ 109 #define EX_LINKED 0x1 110 111 struct netmsk { 112 struct sockaddr_storage nt_net; 113 struct sockaddr_storage nt_mask; 114 char *nt_name; 115 }; 116 117 union grouptypes { 118 struct addrinfo *gt_addrinfo; 119 struct netmsk gt_net; 120 }; 121 122 struct grouplist { 123 int gr_type; 124 union grouptypes gr_ptr; 125 struct grouplist *gr_next; 126 }; 127 /* Group types */ 128 #define GT_NULL 0x0 129 #define GT_HOST 0x1 130 #define GT_NET 0x2 131 #define GT_DEFAULT 0x3 132 #define GT_IGNORE 0x5 133 134 struct hostlist { 135 int ht_flag; /* Uses DP_xx bits */ 136 struct grouplist *ht_grp; 137 struct hostlist *ht_next; 138 }; 139 140 struct fhreturn { 141 int fhr_flag; 142 int fhr_vers; 143 nfsfh_t fhr_fh; 144 }; 145 146 /* Global defs */ 147 char *add_expdir(struct dirlist **, char *, int); 148 void add_dlist(struct dirlist **, struct dirlist *, 149 struct grouplist *, int); 150 void add_mlist(char *, char *); 151 int check_dirpath(char *); 152 int check_options(struct dirlist *); 153 int checkmask(struct sockaddr *sa); 154 int chk_host(struct dirlist *, struct sockaddr *, int *, int *); 155 void create_service(struct netconfig *nconf); 156 void del_mlist(char *, char *); 157 struct dirlist *dirp_search(struct dirlist *, char *); 158 int do_mount(struct exportlist *, struct grouplist *, int, 159 struct ucred *, char *, int, struct statfs *); 160 int do_opt(char **, char **, struct exportlist *, struct grouplist *, 161 int *, int *, struct ucred *); 162 struct exportlist *ex_search(fsid_t *); 163 struct exportlist *get_exp(void); 164 void free_dir(struct dirlist *); 165 void free_exp(struct exportlist *); 166 void free_grp(struct grouplist *); 167 void free_host(struct hostlist *); 168 void get_exportlist(int incremental); 169 int get_host(char *, struct grouplist *, struct grouplist *); 170 struct hostlist *get_ht(void); 171 int get_line(void); 172 void get_mountlist(void); 173 static void delete_export(struct statfs *fsp); 174 int get_net(char *, struct netmsk *, int); 175 void getexp_err(struct exportlist *, struct grouplist *); 176 struct grouplist *get_grp(void); 177 void hang_dirp(struct dirlist *, struct grouplist *, 178 struct exportlist *, int); 179 void huphandler1(int sig); 180 void huphandler2(int sig); 181 int makemask(struct sockaddr_storage *ssp, int bitlen); 182 void mntsrv(struct svc_req *, SVCXPRT *); 183 void nextfield(char **, char **); 184 void out_of_mem(void) __dead2; 185 void parsecred(char *, struct ucred *); 186 int put_exlist(struct dirlist *, XDR *, struct dirlist *, int *, int); 187 void *sa_rawaddr(struct sockaddr *sa, int *nbytes); 188 int sacmp(struct sockaddr *sa1, struct sockaddr *sa2, 189 struct sockaddr *samask); 190 int scan_tree(struct dirlist *, struct sockaddr *); 191 static void usage(void); 192 int xdr_dir(XDR *, char *); 193 int xdr_explist(XDR *, caddr_t); 194 int xdr_explist_brief(XDR *, caddr_t); 195 int xdr_explist_common(XDR *, caddr_t, int); 196 int xdr_fhs(XDR *, caddr_t); 197 int xdr_mlist(XDR *, caddr_t); 198 void terminate(int) __dead2; 199 200 struct exportlist *exphead; 201 struct mountlist *mlhead; 202 struct grouplist *grphead; 203 char *exnames_default[2] = { _PATH_EXPORTS, NULL }; 204 char **exnames; 205 char **hosts = NULL; 206 struct ucred def_anon; 207 int force_v2 = 0; 208 int resvport_only = 1; 209 int nhosts = 0; 210 int dir_only = 1; 211 int dolog = 0; 212 int got_sighup1 = 0; 213 int got_sighup2 = 0; 214 215 int xcreated = 0; 216 char *svcport_str = NULL; 217 int opt_flags; 218 static int have_v6 = 1; 219 220 struct pidfh *pfh = NULL; 221 /* Bits for the opt_flags above */ 222 #define OP_MAPROOT 0x01 223 #define OP_MAPALL 0x02 224 /* 0x4 free */ 225 #define OP_MASK 0x08 226 #define OP_NET 0x10 227 #define OP_ALLDIRS 0x40 228 #define OP_HAVEMASK 0x80 /* A mask was specified or inferred. */ 229 #define OP_QUIET 0x100 230 #define OP_MASKLEN 0x200 231 232 #ifdef DEBUG 233 int debug = 1; 234 void SYSLOG(int, const char *, ...); 235 #define syslog SYSLOG 236 #else 237 int debug = 0; 238 #endif 239 240 /* 241 * Mountd server for NFS mount protocol as described in: 242 * NFS: Network File System Protocol Specification, RFC1094, Appendix A 243 * The optional arguments are the exports file name 244 * default: _PATH_EXPORTS 245 * and "-n" to allow nonroot mount. 246 */ 247 int 248 main(int argc, char **argv) 249 { 250 fd_set readfds; 251 struct netconfig *nconf; 252 char *endptr, **hosts_bak; 253 void *nc_handle; 254 pid_t otherpid; 255 in_port_t svcport; 256 int c, k, s; 257 int maxrec = RPC_MAXDATASIZE; 258 259 def_anon.cr_ref = 1; 260 def_anon.cr_uid = (uid_t)65534; 261 def_anon.cr_ngroups = 1; 262 def_anon.cr_groups[0] = (gid_t)65533; 263 264 /* Check that another mountd isn't already running. */ 265 pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &otherpid); 266 if (pfh == NULL) { 267 if (errno == EEXIST) 268 errx(1, "mountd already running, pid: %d.", otherpid); 269 warn("cannot open or create pidfile"); 270 } 271 272 s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP); 273 if (s < 0) 274 have_v6 = 0; 275 else 276 close(s); 277 if (modfind("nfs") < 0) { 278 /* Not present in kernel, try loading it */ 279 if (kldload("nfs") < 0 || modfind("nfs") < 0) 280 errx(1, "NFS server is not available or loadable"); 281 } 282 283 while ((c = getopt(argc, argv, "2dh:lnp:r")) != -1) { 284 switch (c) { 285 case '2': 286 force_v2 = 1; 287 break; 288 case 'n': 289 resvport_only = 0; 290 break; 291 case 'r': 292 dir_only = 0; 293 break; 294 case 'd': 295 debug = debug ? 0 : 1; 296 break; 297 case 'l': 298 dolog = 1; 299 break; 300 case 'p': 301 endptr = NULL; 302 svcport = (in_port_t)strtoul(optarg, &endptr, 10); 303 if (endptr == NULL || *endptr != '\0' || 304 svcport == 0 || svcport >= IPPORT_MAX) 305 usage(); 306 svcport_str = strdup(optarg); 307 break; 308 case 'h': 309 ++nhosts; 310 hosts_bak = hosts; 311 hosts_bak = realloc(hosts, nhosts * sizeof(char *)); 312 if (hosts_bak == NULL) { 313 if (hosts != NULL) { 314 for (k = 0; k < nhosts; k++) 315 free(hosts[k]); 316 free(hosts); 317 out_of_mem(); 318 } 319 } 320 hosts = hosts_bak; 321 hosts[nhosts - 1] = strdup(optarg); 322 if (hosts[nhosts - 1] == NULL) { 323 for (k = 0; k < (nhosts - 1); k++) 324 free(hosts[k]); 325 free(hosts); 326 out_of_mem(); 327 } 328 break; 329 default: 330 usage(); 331 } 332 } 333 if (debug == 0) { 334 daemon(0, 0); 335 signal(SIGINT, SIG_IGN); 336 signal(SIGQUIT, SIG_IGN); 337 } 338 argc -= optind; 339 argv += optind; 340 grphead = NULL; 341 exphead = NULL; 342 mlhead = NULL; 343 if (argc > 0) 344 exnames = argv; 345 else 346 exnames = exnames_default; 347 openlog("mountd", LOG_PID, LOG_DAEMON); 348 if (debug) 349 warnx("getting export list"); 350 get_exportlist(0); 351 if (debug) 352 warnx("getting mount list"); 353 get_mountlist(); 354 if (debug) 355 warnx("here we go"); 356 signal(SIGHUP, huphandler1); 357 signal(SIGUSR1, huphandler2); 358 signal(SIGTERM, terminate); 359 signal(SIGPIPE, SIG_IGN); 360 361 pidfile_write(pfh); 362 363 rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL); 364 rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL); 365 366 rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec); 367 368 if (!resvport_only) { 369 if (sysctlbyname("vfs.nfs.nfs_privport", NULL, NULL, 370 &resvport_only, sizeof(resvport_only)) != 0 && 371 errno != ENOENT) { 372 syslog(LOG_ERR, "sysctl: %m"); 373 exit(1); 374 } 375 } 376 377 /* 378 * If no hosts were specified, add a wildcard entry to bind to 379 * INADDR_ANY. Otherwise make sure 127.0.0.1 and ::1 are added to the 380 * list. 381 */ 382 if (nhosts == 0) { 383 hosts = malloc(sizeof(char *)); 384 if (hosts == NULL) 385 out_of_mem(); 386 hosts[0] = "*"; 387 nhosts = 1; 388 } else { 389 hosts_bak = hosts; 390 if (have_v6) { 391 hosts_bak = realloc(hosts, (nhosts + 2) * 392 sizeof(char *)); 393 if (hosts_bak == NULL) { 394 for (k = 0; k < nhosts; k++) 395 free(hosts[k]); 396 free(hosts); 397 out_of_mem(); 398 } else 399 hosts = hosts_bak; 400 nhosts += 2; 401 hosts[nhosts - 2] = "::1"; 402 } else { 403 hosts_bak = realloc(hosts, (nhosts + 1) * sizeof(char *)); 404 if (hosts_bak == NULL) { 405 for (k = 0; k < nhosts; k++) 406 free(hosts[k]); 407 free(hosts); 408 out_of_mem(); 409 } else { 410 nhosts += 1; 411 hosts = hosts_bak; 412 } 413 } 414 hosts[nhosts - 1] = "127.0.0.1"; 415 } 416 417 nc_handle = setnetconfig(); 418 while ((nconf = getnetconfig(nc_handle))) { 419 if (nconf->nc_flag & NC_VISIBLE) { 420 if (have_v6 == 0 && strcmp(nconf->nc_protofmly, 421 "inet6") == 0) { 422 /* DO NOTHING */ 423 } else 424 create_service(nconf); 425 } 426 } 427 endnetconfig(nc_handle); 428 429 if (xcreated == 0) { 430 syslog(LOG_ERR, "could not create any services"); 431 exit(1); 432 } 433 434 /* Expand svc_run() here so that we can call get_exportlist(). */ 435 for (;;) { 436 if (got_sighup1) { 437 got_sighup1 = 0; 438 get_exportlist(0); 439 } 440 if (got_sighup2) { 441 got_sighup2 = 0; 442 get_exportlist(1); 443 } 444 readfds = svc_fdset; 445 switch (select(svc_maxfd + 1, &readfds, NULL, NULL, NULL)) { 446 case -1: 447 if (errno == EINTR) 448 continue; 449 syslog(LOG_ERR, "mountd died: select: %m"); 450 exit(1); 451 case 0: 452 continue; 453 default: 454 svc_getreqset(&readfds); 455 } 456 } 457 } 458 459 /* 460 * This routine creates and binds sockets on the appropriate 461 * addresses. It gets called one time for each transport and 462 * registrates the service with rpcbind on that trasport. 463 */ 464 void 465 create_service(struct netconfig *nconf) 466 { 467 struct addrinfo hints, *res = NULL; 468 struct sockaddr_in *sin; 469 struct sockaddr_in6 *sin6; 470 struct __rpc_sockinfo si; 471 struct netbuf servaddr; 472 SVCXPRT *transp = NULL; 473 int aicode; 474 int fd; 475 int nhostsbak; 476 int one = 1; 477 int r; 478 int registered = 0; 479 u_int32_t host_addr[4]; /* IPv4 or IPv6 */ 480 481 if ((nconf->nc_semantics != NC_TPI_CLTS) && 482 (nconf->nc_semantics != NC_TPI_COTS) && 483 (nconf->nc_semantics != NC_TPI_COTS_ORD)) 484 return; /* not my type */ 485 486 /* 487 * XXX - using RPC library internal functions. 488 */ 489 if (!__rpc_nconf2sockinfo(nconf, &si)) { 490 syslog(LOG_ERR, "cannot get information for %s", 491 nconf->nc_netid); 492 return; 493 } 494 495 /* Get mountd's address on this transport */ 496 memset(&hints, 0, sizeof hints); 497 hints.ai_flags = AI_PASSIVE; 498 hints.ai_family = si.si_af; 499 hints.ai_socktype = si.si_socktype; 500 hints.ai_protocol = si.si_proto; 501 502 /* 503 * Bind to specific IPs if asked to 504 */ 505 nhostsbak = nhosts; 506 while (nhostsbak > 0) { 507 --nhostsbak; 508 /* 509 * XXX - using RPC library internal functions. 510 */ 511 if ((fd = __rpc_nconf2fd(nconf)) < 0) { 512 int non_fatal = 0; 513 if (errno == EPROTONOSUPPORT && 514 nconf->nc_semantics != NC_TPI_CLTS) 515 non_fatal = 1; 516 517 syslog(non_fatal ? LOG_DEBUG : LOG_ERR, 518 "cannot create socket for %s", nconf->nc_netid); 519 return; 520 } 521 522 switch (hints.ai_family) { 523 case AF_INET: 524 if (inet_pton(AF_INET, hosts[nhostsbak], 525 host_addr) == 1) { 526 hints.ai_flags &= AI_NUMERICHOST; 527 } else { 528 /* 529 * Skip if we have an AF_INET6 address. 530 */ 531 if (inet_pton(AF_INET6, hosts[nhostsbak], 532 host_addr) == 1) { 533 close(fd); 534 continue; 535 } 536 } 537 break; 538 case AF_INET6: 539 if (inet_pton(AF_INET6, hosts[nhostsbak], 540 host_addr) == 1) { 541 hints.ai_flags &= AI_NUMERICHOST; 542 } else { 543 /* 544 * Skip if we have an AF_INET address. 545 */ 546 if (inet_pton(AF_INET, hosts[nhostsbak], 547 host_addr) == 1) { 548 close(fd); 549 continue; 550 } 551 } 552 553 /* 554 * We're doing host-based access checks here, so don't 555 * allow v4-in-v6 to confuse things. The kernel will 556 * disable it by default on NFS sockets too. 557 */ 558 if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, 559 sizeof one) < 0) { 560 syslog(LOG_ERR, 561 "can't disable v4-in-v6 on IPv6 socket"); 562 exit(1); 563 } 564 break; 565 default: 566 break; 567 } 568 569 /* 570 * If no hosts were specified, just bind to INADDR_ANY 571 */ 572 if (strcmp("*", hosts[nhostsbak]) == 0) { 573 if (svcport_str == NULL) { 574 res = malloc(sizeof(struct addrinfo)); 575 if (res == NULL) 576 out_of_mem(); 577 res->ai_flags = hints.ai_flags; 578 res->ai_family = hints.ai_family; 579 res->ai_protocol = hints.ai_protocol; 580 switch (res->ai_family) { 581 case AF_INET: 582 sin = malloc(sizeof(struct sockaddr_in)); 583 if (sin == NULL) 584 out_of_mem(); 585 sin->sin_family = AF_INET; 586 sin->sin_port = htons(0); 587 sin->sin_addr.s_addr = htonl(INADDR_ANY); 588 res->ai_addr = (struct sockaddr*) sin; 589 res->ai_addrlen = (socklen_t) 590 sizeof(res->ai_addr); 591 break; 592 case AF_INET6: 593 sin6 = malloc(sizeof(struct sockaddr_in6)); 594 if (sin6 == NULL) 595 out_of_mem(); 596 sin6->sin6_family = AF_INET6; 597 sin6->sin6_port = htons(0); 598 sin6->sin6_addr = in6addr_any; 599 res->ai_addr = (struct sockaddr*) sin6; 600 res->ai_addrlen = (socklen_t) 601 sizeof(res->ai_addr); 602 break; 603 default: 604 break; 605 } 606 } else { 607 if ((aicode = getaddrinfo(NULL, svcport_str, 608 &hints, &res)) != 0) { 609 syslog(LOG_ERR, 610 "cannot get local address for %s: %s", 611 nconf->nc_netid, 612 gai_strerror(aicode)); 613 continue; 614 } 615 } 616 } else { 617 if ((aicode = getaddrinfo(hosts[nhostsbak], svcport_str, 618 &hints, &res)) != 0) { 619 syslog(LOG_ERR, 620 "cannot get local address for %s: %s", 621 nconf->nc_netid, gai_strerror(aicode)); 622 continue; 623 } 624 } 625 626 { 627 int on = 1; 628 629 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, 630 (char *)&on, sizeof(on)); 631 } 632 633 r = bindresvport_sa(fd, res->ai_addr); 634 if (r != 0) { 635 syslog(LOG_ERR, "bindresvport_sa: %m"); 636 exit(1); 637 } 638 639 if (nconf->nc_semantics != NC_TPI_CLTS) 640 listen(fd, SOMAXCONN); 641 642 if (nconf->nc_semantics == NC_TPI_CLTS ) 643 transp = svc_dg_create(fd, 0, 0); 644 else 645 transp = svc_vc_create(fd, RPC_MAXDATASIZE, 646 RPC_MAXDATASIZE); 647 648 if (transp != NULL) { 649 if (!svc_reg(transp, RPCPROG_MNT, RPCMNT_VER1, mntsrv, 650 NULL)) 651 syslog(LOG_ERR, 652 "can't register %s RPCMNT_VER1 service", 653 nconf->nc_netid); 654 if (!force_v2) { 655 if (!svc_reg(transp, RPCPROG_MNT, RPCMNT_VER3, 656 mntsrv, NULL)) 657 syslog(LOG_ERR, 658 "can't register %s RPCMNT_VER3 service", 659 nconf->nc_netid); 660 } 661 } else 662 syslog(LOG_WARNING, "can't create %s services", 663 nconf->nc_netid); 664 665 if (registered == 0) { 666 registered = 1; 667 memset(&hints, 0, sizeof hints); 668 hints.ai_flags = AI_PASSIVE; 669 hints.ai_family = si.si_af; 670 hints.ai_socktype = si.si_socktype; 671 hints.ai_protocol = si.si_proto; 672 673 if (svcport_str == NULL) { 674 svcport_str = malloc(NI_MAXSERV * sizeof(char)); 675 if (svcport_str == NULL) 676 out_of_mem(); 677 678 if (getnameinfo(res->ai_addr, 679 res->ai_addr->sa_len, NULL, NI_MAXHOST, 680 svcport_str, NI_MAXSERV * sizeof(char), 681 NI_NUMERICHOST | NI_NUMERICSERV)) 682 errx(1, "Cannot get port number"); 683 } 684 685 if((aicode = getaddrinfo(NULL, svcport_str, &hints, 686 &res)) != 0) { 687 syslog(LOG_ERR, "cannot get local address: %s", 688 gai_strerror(aicode)); 689 exit(1); 690 } 691 692 servaddr.buf = malloc(res->ai_addrlen); 693 memcpy(servaddr.buf, res->ai_addr, res->ai_addrlen); 694 servaddr.len = res->ai_addrlen; 695 696 rpcb_set(RPCPROG_MNT, RPCMNT_VER1, nconf, &servaddr); 697 rpcb_set(RPCPROG_MNT, RPCMNT_VER3, nconf, &servaddr); 698 699 xcreated++; 700 freeaddrinfo(res); 701 } 702 } /* end while */ 703 } 704 705 static void 706 usage(void) 707 { 708 fprintf(stderr, 709 "usage: mountd [-2] [-d] [-l] [-n] [-p <port>] [-r] " 710 "[-h <bindip>] [export_file ...]\n"); 711 exit(1); 712 } 713 714 /* 715 * The mount rpc service 716 */ 717 void 718 mntsrv(struct svc_req *rqstp, SVCXPRT *transp) 719 { 720 struct exportlist *ep; 721 struct dirlist *dp; 722 struct fhreturn fhr; 723 struct stat stb; 724 struct statfs fsb; 725 char host[NI_MAXHOST], numerichost[NI_MAXHOST]; 726 int lookup_failed = 1; 727 struct sockaddr *saddr; 728 u_short sport; 729 char rpcpath[RPCMNT_PATHLEN + 1], dirpath[MAXPATHLEN]; 730 int bad = 0, defset, hostset; 731 sigset_t sighup_mask; 732 733 sigemptyset(&sighup_mask); 734 sigaddset(&sighup_mask, SIGHUP); 735 736 saddr = svc_getrpccaller(transp)->buf; 737 switch (saddr->sa_family) { 738 case AF_INET6: 739 sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port); 740 break; 741 case AF_INET: 742 sport = ntohs(((struct sockaddr_in *)saddr)->sin_port); 743 break; 744 default: 745 syslog(LOG_ERR, "request from unknown address family"); 746 return; 747 } 748 lookup_failed = getnameinfo(saddr, saddr->sa_len, host, sizeof host, 749 NULL, 0, 0); 750 getnameinfo(saddr, saddr->sa_len, numerichost, 751 sizeof numerichost, NULL, 0, NI_NUMERICHOST); 752 switch (rqstp->rq_proc) { 753 case NULLPROC: 754 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL)) 755 syslog(LOG_ERR, "can't send reply"); 756 return; 757 case RPCMNT_MOUNT: 758 if (sport >= IPPORT_RESERVED && resvport_only) { 759 syslog(LOG_NOTICE, 760 "mount request from %s from unprivileged port", 761 numerichost); 762 svcerr_weakauth(transp); 763 return; 764 } 765 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) { 766 syslog(LOG_NOTICE, "undecodable mount request from %s", 767 numerichost); 768 svcerr_decode(transp); 769 return; 770 } 771 772 /* 773 * Get the real pathname and make sure it is a directory 774 * or a regular file if the -r option was specified 775 * and it exists. 776 */ 777 if (realpath(rpcpath, dirpath) == NULL || 778 stat(dirpath, &stb) < 0 || 779 (!S_ISDIR(stb.st_mode) && 780 (dir_only || !S_ISREG(stb.st_mode))) || 781 statfs(dirpath, &fsb) < 0) { 782 chdir("/"); /* Just in case realpath doesn't */ 783 syslog(LOG_NOTICE, 784 "mount request from %s for non existent path %s", 785 numerichost, dirpath); 786 if (debug) 787 warnx("stat failed on %s", dirpath); 788 bad = ENOENT; /* We will send error reply later */ 789 } 790 791 /* Check in the exports list */ 792 sigprocmask(SIG_BLOCK, &sighup_mask, NULL); 793 ep = ex_search(&fsb.f_fsid); 794 hostset = defset = 0; 795 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset) || 796 ((dp = dirp_search(ep->ex_dirl, dirpath)) && 797 chk_host(dp, saddr, &defset, &hostset)) || 798 (defset && scan_tree(ep->ex_defdir, saddr) == 0 && 799 scan_tree(ep->ex_dirl, saddr) == 0))) { 800 if (bad) { 801 if (!svc_sendreply(transp, (xdrproc_t)xdr_long, 802 &bad)) 803 syslog(LOG_ERR, "can't send reply"); 804 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 805 return; 806 } 807 if (hostset & DP_HOSTSET) 808 fhr.fhr_flag = hostset; 809 else 810 fhr.fhr_flag = defset; 811 fhr.fhr_vers = rqstp->rq_vers; 812 /* Get the file handle */ 813 memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t)); 814 if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) { 815 bad = errno; 816 syslog(LOG_ERR, "can't get fh for %s", dirpath); 817 if (!svc_sendreply(transp, (xdrproc_t)xdr_long, 818 &bad)) 819 syslog(LOG_ERR, "can't send reply"); 820 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 821 return; 822 } 823 if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs, &fhr)) 824 syslog(LOG_ERR, "can't send reply"); 825 if (!lookup_failed) 826 add_mlist(host, dirpath); 827 else 828 add_mlist(numerichost, dirpath); 829 if (debug) 830 warnx("mount successful"); 831 if (dolog) 832 syslog(LOG_NOTICE, 833 "mount request succeeded from %s for %s", 834 numerichost, dirpath); 835 } else { 836 bad = EACCES; 837 syslog(LOG_NOTICE, 838 "mount request denied from %s for %s", 839 numerichost, dirpath); 840 } 841 842 if (bad && !svc_sendreply(transp, (xdrproc_t)xdr_long, &bad)) 843 syslog(LOG_ERR, "can't send reply"); 844 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 845 return; 846 case RPCMNT_DUMP: 847 if (!svc_sendreply(transp, (xdrproc_t)xdr_mlist, NULL)) 848 syslog(LOG_ERR, "can't send reply"); 849 else if (dolog) 850 syslog(LOG_NOTICE, 851 "dump request succeeded from %s", 852 numerichost); 853 return; 854 case RPCMNT_UMOUNT: 855 if (sport >= IPPORT_RESERVED && resvport_only) { 856 syslog(LOG_NOTICE, 857 "umount request from %s from unprivileged port", 858 numerichost); 859 svcerr_weakauth(transp); 860 return; 861 } 862 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) { 863 syslog(LOG_NOTICE, "undecodable umount request from %s", 864 numerichost); 865 svcerr_decode(transp); 866 return; 867 } 868 if (realpath(rpcpath, dirpath) == NULL) { 869 syslog(LOG_NOTICE, "umount request from %s " 870 "for non existent path %s", 871 numerichost, dirpath); 872 } 873 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL)) 874 syslog(LOG_ERR, "can't send reply"); 875 if (!lookup_failed) 876 del_mlist(host, dirpath); 877 del_mlist(numerichost, dirpath); 878 if (dolog) 879 syslog(LOG_NOTICE, 880 "umount request succeeded from %s for %s", 881 numerichost, dirpath); 882 return; 883 case RPCMNT_UMNTALL: 884 if (sport >= IPPORT_RESERVED && resvport_only) { 885 syslog(LOG_NOTICE, 886 "umountall request from %s from unprivileged port", 887 numerichost); 888 svcerr_weakauth(transp); 889 return; 890 } 891 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL)) 892 syslog(LOG_ERR, "can't send reply"); 893 if (!lookup_failed) 894 del_mlist(host, NULL); 895 del_mlist(numerichost, NULL); 896 if (dolog) 897 syslog(LOG_NOTICE, 898 "umountall request succeeded from %s", 899 numerichost); 900 return; 901 case RPCMNT_EXPORT: 902 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, NULL)) 903 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist_brief, NULL)) 904 syslog(LOG_ERR, "can't send reply"); 905 if (dolog) 906 syslog(LOG_NOTICE, 907 "export request succeeded from %s", 908 numerichost); 909 return; 910 default: 911 svcerr_noproc(transp); 912 return; 913 } 914 } 915 916 /* 917 * Xdr conversion for a dirpath string 918 */ 919 int 920 xdr_dir(XDR *xdrsp, char *dirp) 921 { 922 return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN)); 923 } 924 925 /* 926 * Xdr routine to generate file handle reply 927 */ 928 int 929 xdr_fhs(XDR *xdrsp, caddr_t cp) 930 { 931 struct fhreturn *fhrp = (struct fhreturn *)cp; 932 long ok = 0, len, auth; 933 934 if (!xdr_long(xdrsp, &ok)) 935 return (0); 936 switch (fhrp->fhr_vers) { 937 case 1: 938 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH)); 939 case 3: 940 len = NFSX_V3FH; 941 if (!xdr_long(xdrsp, &len)) 942 return (0); 943 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len)) 944 return (0); 945 auth = RPCAUTH_UNIX; 946 len = 1; 947 if (!xdr_long(xdrsp, &len)) 948 return (0); 949 return (xdr_long(xdrsp, &auth)); 950 } 951 return (0); 952 } 953 954 int 955 xdr_mlist(XDR *xdrsp, caddr_t cp __unused) 956 { 957 struct mountlist *mlp; 958 int true = 1; 959 int false = 0; 960 char *strp; 961 962 mlp = mlhead; 963 while (mlp) { 964 if (!xdr_bool(xdrsp, &true)) 965 return (0); 966 strp = &mlp->ml_host[0]; 967 if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN)) 968 return (0); 969 strp = &mlp->ml_dirp[0]; 970 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN)) 971 return (0); 972 mlp = mlp->ml_next; 973 } 974 if (!xdr_bool(xdrsp, &false)) 975 return (0); 976 return (1); 977 } 978 979 /* 980 * Xdr conversion for export list 981 */ 982 int 983 xdr_explist_common(XDR *xdrsp, caddr_t cp __unused, int brief) 984 { 985 struct exportlist *ep; 986 int false = 0; 987 int putdef; 988 sigset_t sighup_mask; 989 990 sigemptyset(&sighup_mask); 991 sigaddset(&sighup_mask, SIGHUP); 992 sigaddset(&sighup_mask, SIGUSR1); 993 sigprocmask(SIG_BLOCK, &sighup_mask, NULL); 994 ep = exphead; 995 while (ep) { 996 putdef = 0; 997 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir, 998 &putdef, brief)) 999 goto errout; 1000 if (ep->ex_defdir && putdef == 0 && 1001 put_exlist(ep->ex_defdir, xdrsp, NULL, 1002 &putdef, brief)) 1003 goto errout; 1004 ep = ep->ex_next; 1005 } 1006 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 1007 if (!xdr_bool(xdrsp, &false)) 1008 return (0); 1009 return (1); 1010 errout: 1011 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 1012 return (0); 1013 } 1014 1015 /* 1016 * Called from xdr_explist() to traverse the tree and export the 1017 * directory paths. 1018 */ 1019 int 1020 put_exlist(struct dirlist *dp, XDR *xdrsp, struct dirlist *adp, int *putdefp, int brief) 1021 { 1022 struct grouplist *grp; 1023 struct hostlist *hp; 1024 int true = 1; 1025 int false = 0; 1026 int gotalldir = 0; 1027 char *strp; 1028 1029 if (dp) { 1030 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp, brief)) 1031 return (1); 1032 if (!xdr_bool(xdrsp, &true)) 1033 return (1); 1034 strp = dp->dp_dirp; 1035 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN)) 1036 return (1); 1037 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) { 1038 gotalldir = 1; 1039 *putdefp = 1; 1040 } 1041 if (brief) { 1042 if (!xdr_bool(xdrsp, &true)) 1043 return (1); 1044 strp = "(...)"; 1045 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN)) 1046 return (1); 1047 } else if ((dp->dp_flag & DP_DEFSET) == 0 && 1048 (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) { 1049 hp = dp->dp_hosts; 1050 while (hp) { 1051 grp = hp->ht_grp; 1052 if (grp->gr_type == GT_HOST) { 1053 if (!xdr_bool(xdrsp, &true)) 1054 return (1); 1055 strp = grp->gr_ptr.gt_addrinfo->ai_canonname; 1056 if (!xdr_string(xdrsp, &strp, 1057 RPCMNT_NAMELEN)) 1058 return (1); 1059 } else if (grp->gr_type == GT_NET) { 1060 if (!xdr_bool(xdrsp, &true)) 1061 return (1); 1062 strp = grp->gr_ptr.gt_net.nt_name; 1063 if (!xdr_string(xdrsp, &strp, 1064 RPCMNT_NAMELEN)) 1065 return (1); 1066 } 1067 hp = hp->ht_next; 1068 if (gotalldir && hp == NULL) { 1069 hp = adp->dp_hosts; 1070 gotalldir = 0; 1071 } 1072 } 1073 } 1074 if (!xdr_bool(xdrsp, &false)) 1075 return (1); 1076 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp, brief)) 1077 return (1); 1078 } 1079 return (0); 1080 } 1081 1082 int 1083 xdr_explist(XDR *xdrsp, caddr_t cp) 1084 { 1085 1086 return xdr_explist_common(xdrsp, cp, 0); 1087 } 1088 1089 int 1090 xdr_explist_brief(XDR *xdrsp, caddr_t cp) 1091 { 1092 1093 return xdr_explist_common(xdrsp, cp, 1); 1094 } 1095 1096 char *line; 1097 size_t linesize; 1098 FILE *exp_file; 1099 1100 /* 1101 * Get the export list from one, currently open file 1102 */ 1103 static void 1104 get_exportlist_one(void) 1105 { 1106 struct exportlist *ep, *ep2; 1107 struct grouplist *grp, *tgrp; 1108 struct exportlist **epp; 1109 struct dirlist *dirhead; 1110 struct statfs fsb; 1111 struct ucred anon; 1112 char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc; 1113 int len, has_host, exflags, got_nondir, dirplen, netgrp; 1114 1115 dirhead = (struct dirlist *)NULL; 1116 while (get_line()) { 1117 if (debug) 1118 warnx("got line %s", line); 1119 cp = line; 1120 nextfield(&cp, &endcp); 1121 if (*cp == '#') 1122 goto nextline; 1123 1124 /* 1125 * Set defaults. 1126 */ 1127 has_host = FALSE; 1128 anon = def_anon; 1129 exflags = MNT_EXPORTED; 1130 got_nondir = 0; 1131 opt_flags = 0; 1132 ep = NULL; 1133 1134 /* 1135 * Create new exports list entry 1136 */ 1137 len = endcp-cp; 1138 tgrp = grp = get_grp(); 1139 while (len > 0) { 1140 if (len > RPCMNT_NAMELEN) { 1141 getexp_err(ep, tgrp); 1142 goto nextline; 1143 } 1144 if (*cp == '-') { 1145 if (ep == NULL) { 1146 getexp_err(ep, tgrp); 1147 goto nextline; 1148 } 1149 if (debug) 1150 warnx("doing opt %s", cp); 1151 got_nondir = 1; 1152 if (do_opt(&cp, &endcp, ep, grp, &has_host, 1153 &exflags, &anon)) { 1154 getexp_err(ep, tgrp); 1155 goto nextline; 1156 } 1157 } else if (*cp == '/') { 1158 savedc = *endcp; 1159 *endcp = '\0'; 1160 if (check_dirpath(cp) && 1161 statfs(cp, &fsb) >= 0) { 1162 if ((fsb.f_flags & MNT_AUTOMOUNTED) != 0) 1163 syslog(LOG_ERR, "Warning: exporting of " 1164 "automounted fs %s not supported", cp); 1165 if (got_nondir) { 1166 syslog(LOG_ERR, "dirs must be first"); 1167 getexp_err(ep, tgrp); 1168 goto nextline; 1169 } 1170 if (ep) { 1171 if (ep->ex_fs.val[0] != fsb.f_fsid.val[0] || 1172 ep->ex_fs.val[1] != fsb.f_fsid.val[1]) { 1173 getexp_err(ep, tgrp); 1174 goto nextline; 1175 } 1176 } else { 1177 /* 1178 * See if this directory is already 1179 * in the list. 1180 */ 1181 ep = ex_search(&fsb.f_fsid); 1182 if (ep == NULL) { 1183 ep = get_exp(); 1184 ep->ex_fs = fsb.f_fsid; 1185 ep->ex_fsdir = strdup(fsb.f_mntonname); 1186 if (ep->ex_fsdir == NULL) 1187 out_of_mem(); 1188 1189 delete_export(&fsb); 1190 1191 if (debug) 1192 warnx("making new ep fs=0x%x,0x%x", 1193 fsb.f_fsid.val[0], 1194 fsb.f_fsid.val[1]); 1195 } else if (debug) 1196 warnx("found ep fs=0x%x,0x%x", 1197 fsb.f_fsid.val[0], 1198 fsb.f_fsid.val[1]); 1199 } 1200 1201 /* 1202 * Add dirpath to export mount point. 1203 */ 1204 dirp = add_expdir(&dirhead, cp, len); 1205 dirplen = len; 1206 } else { 1207 getexp_err(ep, tgrp); 1208 goto nextline; 1209 } 1210 *endcp = savedc; 1211 } else { 1212 savedc = *endcp; 1213 *endcp = '\0'; 1214 got_nondir = 1; 1215 if (ep == NULL) { 1216 getexp_err(ep, tgrp); 1217 goto nextline; 1218 } 1219 1220 /* 1221 * Get the host or netgroup. 1222 */ 1223 setnetgrent(cp); 1224 netgrp = getnetgrent(&hst, &usr, &dom); 1225 do { 1226 if (has_host) { 1227 grp->gr_next = get_grp(); 1228 grp = grp->gr_next; 1229 } 1230 if (netgrp) { 1231 if (hst == NULL) { 1232 syslog(LOG_ERR, 1233 "null hostname in netgroup %s, skipping", cp); 1234 grp->gr_type = GT_IGNORE; 1235 } else if (get_host(hst, grp, tgrp)) { 1236 syslog(LOG_ERR, 1237 "bad host %s in netgroup %s, skipping", hst, cp); 1238 grp->gr_type = GT_IGNORE; 1239 } 1240 } else if (get_host(cp, grp, tgrp)) { 1241 syslog(LOG_ERR, "bad host %s, skipping", cp); 1242 grp->gr_type = GT_IGNORE; 1243 } 1244 has_host = TRUE; 1245 } while (netgrp && getnetgrent(&hst, &usr, &dom)); 1246 endnetgrent(); 1247 *endcp = savedc; 1248 } 1249 cp = endcp; 1250 nextfield(&cp, &endcp); 1251 len = endcp - cp; 1252 } 1253 if (check_options(dirhead)) { 1254 getexp_err(ep, tgrp); 1255 goto nextline; 1256 } 1257 if (!has_host) { 1258 grp->gr_type = GT_DEFAULT; 1259 if (debug) 1260 warnx("adding a default entry"); 1261 1262 /* 1263 * Don't allow a network export coincide with a list of 1264 * host(s) on the same line. 1265 */ 1266 } else if ((opt_flags & OP_NET) && tgrp->gr_next) { 1267 syslog(LOG_ERR, "network/host conflict"); 1268 getexp_err(ep, tgrp); 1269 goto nextline; 1270 1271 /* 1272 * If an export list was specified on this line, make sure 1273 * that we have at least one valid entry, otherwise skip it. 1274 */ 1275 } else { 1276 grp = tgrp; 1277 while (grp && grp->gr_type == GT_IGNORE) 1278 grp = grp->gr_next; 1279 if (! grp) { 1280 getexp_err(ep, tgrp); 1281 goto nextline; 1282 } 1283 } 1284 1285 /* 1286 * Loop through hosts, pushing the exports into the kernel. 1287 * After loop, tgrp points to the start of the list and 1288 * grp points to the last entry in the list. 1289 */ 1290 grp = tgrp; 1291 do { 1292 if (do_mount(ep, grp, exflags, &anon, dirp, dirplen, 1293 &fsb)) { 1294 getexp_err(ep, tgrp); 1295 goto nextline; 1296 } 1297 } while (grp->gr_next && (grp = grp->gr_next)); 1298 1299 /* 1300 * Success. Update the data structures. 1301 */ 1302 if (has_host) { 1303 hang_dirp(dirhead, tgrp, ep, opt_flags); 1304 grp->gr_next = grphead; 1305 grphead = tgrp; 1306 } else { 1307 hang_dirp(dirhead, NULL, ep, 1308 opt_flags); 1309 free_grp(grp); 1310 } 1311 dirhead = NULL; 1312 if ((ep->ex_flag & EX_LINKED) == 0) { 1313 ep2 = exphead; 1314 epp = &exphead; 1315 1316 /* 1317 * Insert in the list in alphabetical order. 1318 */ 1319 while (ep2 && strcmp(ep2->ex_fsdir, ep->ex_fsdir) < 0) { 1320 epp = &ep2->ex_next; 1321 ep2 = ep2->ex_next; 1322 } 1323 if (ep2) 1324 ep->ex_next = ep2; 1325 *epp = ep; 1326 ep->ex_flag |= EX_LINKED; 1327 } 1328 nextline: 1329 if (dirhead) { 1330 free_dir(dirhead); 1331 dirhead = NULL; 1332 } 1333 } 1334 fclose(exp_file); 1335 } 1336 1337 /* 1338 * Get the export list from all specified files. 1339 * 1340 * If incremental is non-zero we were signalled by mount and we do not 1341 * call mountctl() to blow away existing exports. 1342 */ 1343 void 1344 get_exportlist(int incremental) 1345 { 1346 struct exportlist *ep, *ep2; 1347 struct grouplist *grp, *tgrp; 1348 struct statfs *fsp, *mntbufp; 1349 struct vfsconf vfc; 1350 int num, i; 1351 int done; 1352 1353 /* 1354 * First, get rid of the old list 1355 */ 1356 ep = exphead; 1357 while (ep) { 1358 ep2 = ep; 1359 ep = ep->ex_next; 1360 free_exp(ep2); 1361 } 1362 exphead = NULL; 1363 1364 grp = grphead; 1365 while (grp) { 1366 tgrp = grp; 1367 grp = grp->gr_next; 1368 free_grp(tgrp); 1369 } 1370 grphead = NULL; 1371 1372 /* 1373 * And delete exports that are in the kernel for all local 1374 * filesystems. 1375 * XXX: Should know how to handle all local exportable filesystems. 1376 */ 1377 num = getmntinfo(&mntbufp, MNT_NOWAIT); 1378 for (i = 0; i < num; i++) { 1379 fsp = &mntbufp[i]; 1380 if (getvfsbyname(fsp->f_fstypename, &vfc) != 0) { 1381 syslog(LOG_ERR, "getvfsbyname() failed for %s", 1382 fsp->f_fstypename); 1383 continue; 1384 } 1385 1386 /* 1387 * Do not delete export for network filesystem by 1388 * passing "export" arg to mount(). 1389 * It only makes sense to do this for local filesystems. 1390 */ 1391 if (vfc.vfc_flags & VFCF_NETWORK) 1392 continue; 1393 1394 if (incremental == 0) 1395 delete_export(fsp); 1396 } 1397 1398 /* 1399 * Read in the exports file and build the list, calling 1400 * nmount() as we go along to push the export rules into the kernel. 1401 */ 1402 done = 0; 1403 for (i = 0; exnames[i] != NULL; i++) { 1404 if (debug) 1405 warnx("reading exports from %s", exnames[i]); 1406 if ((exp_file = fopen(exnames[i], "r")) == NULL) { 1407 syslog(LOG_WARNING, "can't open %s", exnames[i]); 1408 continue; 1409 } 1410 get_exportlist_one(); 1411 fclose(exp_file); 1412 done++; 1413 } 1414 if (done == 0) { 1415 syslog(LOG_ERR, "can't open any exports file"); 1416 exit(2); 1417 } 1418 } 1419 1420 /* 1421 * Allocate an export list element 1422 */ 1423 struct exportlist * 1424 get_exp(void) 1425 { 1426 struct exportlist *ep; 1427 1428 ep = (struct exportlist *)malloc(sizeof (struct exportlist)); 1429 if (ep == NULL) 1430 out_of_mem(); 1431 memset(ep, 0, sizeof(struct exportlist)); 1432 return (ep); 1433 } 1434 1435 /* 1436 * Allocate a group list element 1437 */ 1438 struct grouplist * 1439 get_grp(void) 1440 { 1441 struct grouplist *gp; 1442 1443 gp = (struct grouplist *)malloc(sizeof (struct grouplist)); 1444 if (gp == NULL) 1445 out_of_mem(); 1446 memset(gp, 0, sizeof(struct grouplist)); 1447 return (gp); 1448 } 1449 1450 /* 1451 * Clean up upon an error in get_exportlist(). 1452 */ 1453 void 1454 getexp_err(struct exportlist *ep, struct grouplist *grp) 1455 { 1456 struct grouplist *tgrp; 1457 1458 if (!(opt_flags & OP_QUIET)) 1459 syslog(LOG_ERR, "bad exports list line %s", line); 1460 if (ep && (ep->ex_flag & EX_LINKED) == 0) 1461 free_exp(ep); 1462 while (grp) { 1463 tgrp = grp; 1464 grp = grp->gr_next; 1465 free_grp(tgrp); 1466 } 1467 } 1468 1469 /* 1470 * Search the export list for a matching fs. 1471 */ 1472 struct exportlist * 1473 ex_search(fsid_t *fsid) 1474 { 1475 struct exportlist *ep; 1476 1477 ep = exphead; 1478 while (ep) { 1479 if (ep->ex_fs.val[0] == fsid->val[0] && 1480 ep->ex_fs.val[1] == fsid->val[1]) 1481 return (ep); 1482 ep = ep->ex_next; 1483 } 1484 return (ep); 1485 } 1486 1487 /* 1488 * Add a directory path to the list. 1489 */ 1490 char * 1491 add_expdir(struct dirlist **dpp, char *cp, int len) 1492 { 1493 struct dirlist *dp; 1494 1495 dp = malloc(sizeof (struct dirlist)); 1496 if (dp == (struct dirlist *)NULL) 1497 out_of_mem(); 1498 dp->dp_left = *dpp; 1499 dp->dp_right = (struct dirlist *)NULL; 1500 dp->dp_flag = 0; 1501 dp->dp_hosts = (struct hostlist *)NULL; 1502 dp->dp_dirp = strndup(cp, len); 1503 if (dp->dp_dirp == NULL) 1504 out_of_mem(); 1505 *dpp = dp; 1506 return (dp->dp_dirp); 1507 } 1508 1509 /* 1510 * Hang the dir list element off the dirpath binary tree as required 1511 * and update the entry for host. 1512 */ 1513 void 1514 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep, 1515 int flags) 1516 { 1517 struct hostlist *hp; 1518 struct dirlist *dp2; 1519 1520 if (flags & OP_ALLDIRS) { 1521 if (ep->ex_defdir) 1522 free((caddr_t)dp); 1523 else 1524 ep->ex_defdir = dp; 1525 if (grp == NULL) { 1526 ep->ex_defdir->dp_flag |= DP_DEFSET; 1527 } else while (grp) { 1528 hp = get_ht(); 1529 hp->ht_grp = grp; 1530 hp->ht_next = ep->ex_defdir->dp_hosts; 1531 ep->ex_defdir->dp_hosts = hp; 1532 grp = grp->gr_next; 1533 } 1534 } else { 1535 1536 /* 1537 * Loop through the directories adding them to the tree. 1538 */ 1539 while (dp) { 1540 dp2 = dp->dp_left; 1541 add_dlist(&ep->ex_dirl, dp, grp, flags); 1542 dp = dp2; 1543 } 1544 } 1545 } 1546 1547 /* 1548 * Traverse the binary tree either updating a node that is already there 1549 * for the new directory or adding the new node. 1550 */ 1551 void 1552 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp, 1553 int flags) 1554 { 1555 struct dirlist *dp; 1556 struct hostlist *hp; 1557 int cmp; 1558 1559 dp = *dpp; 1560 if (dp) { 1561 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp); 1562 if (cmp > 0) { 1563 add_dlist(&dp->dp_left, newdp, grp, flags); 1564 return; 1565 } else if (cmp < 0) { 1566 add_dlist(&dp->dp_right, newdp, grp, flags); 1567 return; 1568 } else 1569 free((caddr_t)newdp); 1570 } else { 1571 dp = newdp; 1572 dp->dp_left = NULL; 1573 *dpp = dp; 1574 } 1575 if (grp) { 1576 1577 /* 1578 * Hang all of the host(s) off of the directory point. 1579 */ 1580 do { 1581 hp = get_ht(); 1582 hp->ht_grp = grp; 1583 hp->ht_next = dp->dp_hosts; 1584 dp->dp_hosts = hp; 1585 grp = grp->gr_next; 1586 } while (grp); 1587 } else { 1588 dp->dp_flag |= DP_DEFSET; 1589 } 1590 } 1591 1592 /* 1593 * Search for a dirpath on the export point. 1594 */ 1595 struct dirlist * 1596 dirp_search(struct dirlist *dp, char *dirp) 1597 { 1598 int cmp; 1599 1600 if (dp) { 1601 cmp = strcmp(dp->dp_dirp, dirp); 1602 if (cmp > 0) 1603 return (dirp_search(dp->dp_left, dirp)); 1604 else if (cmp < 0) 1605 return (dirp_search(dp->dp_right, dirp)); 1606 else 1607 return (dp); 1608 } 1609 return (dp); 1610 } 1611 1612 /* 1613 * Scan for a host match in a directory tree. 1614 */ 1615 int 1616 chk_host(struct dirlist *dp, struct sockaddr *saddr, int *defsetp, 1617 int *hostsetp) 1618 { 1619 struct hostlist *hp; 1620 struct grouplist *grp; 1621 struct addrinfo *ai; 1622 1623 if (dp) { 1624 if (dp->dp_flag & DP_DEFSET) 1625 *defsetp = dp->dp_flag; 1626 hp = dp->dp_hosts; 1627 while (hp) { 1628 grp = hp->ht_grp; 1629 switch (grp->gr_type) { 1630 case GT_HOST: 1631 ai = grp->gr_ptr.gt_addrinfo; 1632 for (; ai; ai = ai->ai_next) { 1633 if (!sacmp(ai->ai_addr, saddr, NULL)) { 1634 *hostsetp = 1635 (hp->ht_flag | DP_HOSTSET); 1636 return (1); 1637 } 1638 } 1639 break; 1640 case GT_NET: 1641 if (!sacmp(saddr, (struct sockaddr *) 1642 &grp->gr_ptr.gt_net.nt_net, 1643 (struct sockaddr *) 1644 &grp->gr_ptr.gt_net.nt_mask)) { 1645 *hostsetp = (hp->ht_flag | DP_HOSTSET); 1646 return (1); 1647 } 1648 break; 1649 } 1650 hp = hp->ht_next; 1651 } 1652 } 1653 return (0); 1654 } 1655 1656 /* 1657 * Scan tree for a host that matches the address. 1658 */ 1659 int 1660 scan_tree(struct dirlist *dp, struct sockaddr *saddr) 1661 { 1662 int defset, hostset; 1663 1664 if (dp) { 1665 if (scan_tree(dp->dp_left, saddr)) 1666 return (1); 1667 if (chk_host(dp, saddr, &defset, &hostset)) 1668 return (1); 1669 if (scan_tree(dp->dp_right, saddr)) 1670 return (1); 1671 } 1672 return (0); 1673 } 1674 1675 /* 1676 * Traverse the dirlist tree and free it up. 1677 */ 1678 void 1679 free_dir(struct dirlist *dp) 1680 { 1681 1682 if (dp) { 1683 free_dir(dp->dp_left); 1684 free_dir(dp->dp_right); 1685 free_host(dp->dp_hosts); 1686 free(dp->dp_dirp); 1687 free(dp); 1688 } 1689 } 1690 1691 /* 1692 * Parse the option string and update fields. 1693 * Option arguments may either be -<option>=<value> or 1694 * -<option> <value> 1695 */ 1696 int 1697 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp, 1698 int *has_hostp, int *exflagsp, struct ucred *cr) 1699 { 1700 char *cpoptarg, *cpoptend; 1701 char *cp, *endcp, *cpopt, savedc, savedc2; 1702 int allflag, usedarg; 1703 1704 savedc2 = '\0'; 1705 cpopt = *cpp; 1706 cpopt++; 1707 cp = *endcpp; 1708 savedc = *cp; 1709 *cp = '\0'; 1710 while (cpopt && *cpopt) { 1711 allflag = 1; 1712 usedarg = -2; 1713 if ((cpoptend = strchr(cpopt, ','))) { 1714 *cpoptend++ = '\0'; 1715 if ((cpoptarg = strchr(cpopt, '='))) 1716 *cpoptarg++ = '\0'; 1717 } else { 1718 if ((cpoptarg = strchr(cpopt, '='))) 1719 *cpoptarg++ = '\0'; 1720 else { 1721 *cp = savedc; 1722 nextfield(&cp, &endcp); 1723 **endcpp = '\0'; 1724 if (endcp > cp && *cp != '-') { 1725 cpoptarg = cp; 1726 savedc2 = *endcp; 1727 *endcp = '\0'; 1728 usedarg = 0; 1729 } 1730 } 1731 } 1732 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) { 1733 *exflagsp |= MNT_EXRDONLY; 1734 } else if (cpoptarg && (!strcmp(cpopt, "maproot") || 1735 !(allflag = strcmp(cpopt, "mapall")) || 1736 !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) { 1737 usedarg++; 1738 parsecred(cpoptarg, cr); 1739 if (allflag == 0) { 1740 *exflagsp |= MNT_EXPORTANON; 1741 opt_flags |= OP_MAPALL; 1742 } else 1743 opt_flags |= OP_MAPROOT; 1744 } else if (cpoptarg && (!strcmp(cpopt, "mask") || 1745 !strcmp(cpopt, "m"))) { 1746 if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) { 1747 syslog(LOG_ERR, "bad mask: %s", cpoptarg); 1748 return (1); 1749 } 1750 usedarg++; 1751 opt_flags |= OP_MASK; 1752 } else if (cpoptarg && (!strcmp(cpopt, "network") || 1753 !strcmp(cpopt, "n"))) { 1754 if (strchr(cpoptarg, '/') != NULL) { 1755 if (debug) 1756 fprintf(stderr, "setting OP_MASKLEN\n"); 1757 opt_flags |= OP_MASKLEN; 1758 } 1759 if (grp->gr_type != GT_NULL) { 1760 syslog(LOG_ERR, "network/host conflict"); 1761 return (1); 1762 } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) { 1763 syslog(LOG_ERR, "bad net: %s", cpoptarg); 1764 return (1); 1765 } 1766 grp->gr_type = GT_NET; 1767 *has_hostp = 1; 1768 usedarg++; 1769 opt_flags |= OP_NET; 1770 } else if (!strcmp(cpopt, "alldirs")) { 1771 opt_flags |= OP_ALLDIRS; 1772 } else if (!strcmp(cpopt, "public")) { 1773 *exflagsp |= MNT_EXPUBLIC; 1774 } else if (!strcmp(cpopt, "webnfs")) { 1775 *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON); 1776 opt_flags |= OP_MAPALL; 1777 } else if (cpoptarg && !strcmp(cpopt, "index")) { 1778 ep->ex_indexfile = strdup(cpoptarg); 1779 } else if (!strcmp(cpopt, "quiet")) { 1780 opt_flags |= OP_QUIET; 1781 } else { 1782 syslog(LOG_ERR, "bad opt %s", cpopt); 1783 return (1); 1784 } 1785 if (usedarg >= 0) { 1786 *endcp = savedc2; 1787 **endcpp = savedc; 1788 if (usedarg > 0) { 1789 *cpp = cp; 1790 *endcpp = endcp; 1791 } 1792 return (0); 1793 } 1794 cpopt = cpoptend; 1795 } 1796 **endcpp = savedc; 1797 return (0); 1798 } 1799 1800 /* 1801 * Translate a character string to the corresponding list of network 1802 * addresses for a hostname. 1803 */ 1804 int 1805 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp) 1806 { 1807 struct grouplist *checkgrp; 1808 struct addrinfo *ai, *tai, hints; 1809 int ecode; 1810 char host[NI_MAXHOST]; 1811 1812 if (grp->gr_type != GT_NULL) { 1813 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp); 1814 return (1); 1815 } 1816 memset(&hints, 0, sizeof hints); 1817 hints.ai_flags = AI_CANONNAME; 1818 hints.ai_protocol = IPPROTO_UDP; 1819 ecode = getaddrinfo(cp, NULL, &hints, &ai); 1820 if (ecode != 0) { 1821 syslog(LOG_ERR,"can't get address info for host %s", cp); 1822 return 1; 1823 } 1824 grp->gr_ptr.gt_addrinfo = ai; 1825 while (ai != NULL) { 1826 if (ai->ai_canonname == NULL) { 1827 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host, 1828 sizeof host, NULL, 0, NI_NUMERICHOST) != 0) 1829 strlcpy(host, "?", sizeof(host)); 1830 ai->ai_canonname = strdup(host); 1831 ai->ai_flags |= AI_CANONNAME; 1832 } 1833 if (debug) 1834 fprintf(stderr, "got host %s\n", ai->ai_canonname); 1835 /* 1836 * Sanity check: make sure we don't already have an entry 1837 * for this host in the grouplist. 1838 */ 1839 for (checkgrp = tgrp; checkgrp != NULL; 1840 checkgrp = checkgrp->gr_next) { 1841 if (checkgrp->gr_type != GT_HOST) 1842 continue; 1843 for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL; 1844 tai = tai->ai_next) { 1845 if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0) 1846 continue; 1847 if (debug) 1848 fprintf(stderr, 1849 "ignoring duplicate host %s\n", 1850 ai->ai_canonname); 1851 grp->gr_type = GT_IGNORE; 1852 return (0); 1853 } 1854 } 1855 ai = ai->ai_next; 1856 } 1857 grp->gr_type = GT_HOST; 1858 return (0); 1859 } 1860 1861 /* 1862 * Free up an exports list component 1863 */ 1864 void 1865 free_exp(struct exportlist *ep) 1866 { 1867 1868 if (ep->ex_defdir) { 1869 free_host(ep->ex_defdir->dp_hosts); 1870 free((caddr_t)ep->ex_defdir); 1871 } 1872 if (ep->ex_fsdir) 1873 free(ep->ex_fsdir); 1874 if (ep->ex_indexfile) 1875 free(ep->ex_indexfile); 1876 free_dir(ep->ex_dirl); 1877 free((caddr_t)ep); 1878 } 1879 1880 /* 1881 * Free hosts. 1882 */ 1883 void 1884 free_host(struct hostlist *hp) 1885 { 1886 struct hostlist *hp2; 1887 1888 while (hp) { 1889 hp2 = hp; 1890 hp = hp->ht_next; 1891 free((caddr_t)hp2); 1892 } 1893 } 1894 1895 struct hostlist * 1896 get_ht(void) 1897 { 1898 struct hostlist *hp; 1899 1900 hp = (struct hostlist *)malloc(sizeof (struct hostlist)); 1901 if (hp == NULL) 1902 out_of_mem(); 1903 hp->ht_next = NULL; 1904 hp->ht_flag = 0; 1905 return (hp); 1906 } 1907 1908 /* 1909 * Out of memory, fatal 1910 */ 1911 void 1912 out_of_mem(void) 1913 { 1914 1915 syslog(LOG_ERR, "out of memory"); 1916 exit(2); 1917 } 1918 1919 /* 1920 * Do the mount syscall with the update flag to push the export info into 1921 * the kernel. 1922 */ 1923 int 1924 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags, 1925 struct ucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb) 1926 { 1927 struct statfs fsb1; 1928 struct addrinfo *ai; 1929 struct export_args *eap; 1930 char *cp = NULL; 1931 int done; 1932 char savedc = '\0'; 1933 union { 1934 struct ufs_args ua; 1935 struct iso_args ia; 1936 struct mfs_args ma; 1937 struct msdosfs_args da; 1938 struct ntfs_args na; 1939 } args; 1940 1941 bzero(&args, sizeof args); 1942 /* XXX, we assume that all xx_args look like ufs_args. */ 1943 args.ua.fspec = 0; 1944 eap = &args.ua.export; 1945 1946 eap->ex_flags = exflags; 1947 eap->ex_anon = *anoncrp; 1948 eap->ex_indexfile = ep->ex_indexfile; 1949 if (grp->gr_type == GT_HOST) 1950 ai = grp->gr_ptr.gt_addrinfo; 1951 else 1952 ai = NULL; 1953 done = FALSE; 1954 while (!done) { 1955 switch (grp->gr_type) { 1956 case GT_HOST: 1957 if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0) 1958 goto skip; 1959 eap->ex_addr = ai->ai_addr; 1960 eap->ex_addrlen = ai->ai_addrlen; 1961 eap->ex_masklen = 0; 1962 break; 1963 case GT_NET: 1964 if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 && 1965 have_v6 == 0) 1966 goto skip; 1967 eap->ex_addr = 1968 (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net; 1969 eap->ex_addrlen = args.ua.export.ex_addr->sa_len; 1970 eap->ex_mask = 1971 (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask; 1972 eap->ex_masklen = args.ua.export.ex_mask->sa_len; 1973 break; 1974 case GT_DEFAULT: 1975 eap->ex_addr = NULL; 1976 eap->ex_addrlen = 0; 1977 eap->ex_mask = NULL; 1978 eap->ex_masklen = 0; 1979 break; 1980 case GT_IGNORE: 1981 return(0); 1982 break; 1983 default: 1984 syslog(LOG_ERR, "bad grouptype"); 1985 if (cp) 1986 *cp = savedc; 1987 return (1); 1988 } 1989 1990 /* 1991 * XXX: 1992 * Maybe I should just use the fsb->f_mntonname path instead 1993 * of looping back up the dirp to the mount point?? 1994 * Also, needs to know how to export all types of local 1995 * exportable filesystems and not just "ufs". 1996 */ 1997 for (;;) { 1998 int r; 1999 2000 r = mountctl(fsb->f_mntonname, MOUNTCTL_SET_EXPORT, 2001 -1, 2002 &args.ua.export, sizeof(args.ua.export), 2003 NULL, 0); 2004 if (r < 0 && errno == EOPNOTSUPP) { 2005 r = mount(fsb->f_fstypename, dirp, 2006 fsb->f_flags | MNT_UPDATE, 2007 (caddr_t)&args); 2008 } 2009 if (r >= 0) 2010 break; 2011 if (cp) 2012 *cp-- = savedc; 2013 else 2014 cp = dirp + dirplen - 1; 2015 if (opt_flags & OP_QUIET) 2016 return (1); 2017 if (errno == EPERM) { 2018 if (debug) 2019 warnx("can't change attributes for %s", 2020 dirp); 2021 syslog(LOG_ERR, 2022 "can't change attributes for %s", dirp); 2023 return (1); 2024 } 2025 if (opt_flags & OP_ALLDIRS) { 2026 if (errno == EINVAL) 2027 syslog(LOG_ERR, 2028 "-alldirs requested but %s is not a filesystem mountpoint", 2029 dirp); 2030 else 2031 syslog(LOG_ERR, 2032 "could not remount %s: %m", 2033 dirp); 2034 return (1); 2035 } 2036 /* back up over the last component */ 2037 while (*cp == '/' && cp > dirp) 2038 cp--; 2039 while (*(cp - 1) != '/' && cp > dirp) 2040 cp--; 2041 if (cp == dirp) { 2042 if (debug) 2043 warnx("mnt unsucc"); 2044 syslog(LOG_ERR, "can't export %s", dirp); 2045 return (1); 2046 } 2047 savedc = *cp; 2048 *cp = '\0'; 2049 /* Check that we're still on the same filesystem. */ 2050 if (statfs(dirp, &fsb1) != 0 || bcmp(&fsb1.f_fsid, 2051 &fsb->f_fsid, sizeof(fsb1.f_fsid)) != 0) { 2052 *cp = savedc; 2053 syslog(LOG_ERR, "can't export %s", dirp); 2054 return (1); 2055 } 2056 } 2057 skip: 2058 if (ai != NULL) 2059 ai = ai->ai_next; 2060 if (ai == NULL) 2061 done = TRUE; 2062 } 2063 if (cp) 2064 *cp = savedc; 2065 return (0); 2066 } 2067 2068 /* 2069 * Translate a net address. 2070 * 2071 * If `maskflg' is nonzero, then `cp' is a netmask, not a network address. 2072 */ 2073 int 2074 get_net(char *cp, struct netmsk *net, int maskflg) 2075 { 2076 struct netent *np = NULL; 2077 char *name, *p, *prefp; 2078 struct sockaddr_in sin; 2079 struct sockaddr *sa = NULL; 2080 struct addrinfo hints, *ai = NULL; 2081 char netname[NI_MAXHOST]; 2082 long preflen; 2083 2084 p = prefp = NULL; 2085 if ((opt_flags & OP_MASKLEN) && !maskflg) { 2086 p = strchr(cp, '/'); 2087 *p = '\0'; 2088 prefp = p + 1; 2089 } 2090 2091 /* 2092 * Check for a numeric address first. We wish to avoid 2093 * possible DNS lookups in getnetbyname(). 2094 */ 2095 if (isxdigit(*cp) || *cp == ':') { 2096 memset(&hints, 0, sizeof hints); 2097 /* Ensure the mask and the network have the same family. */ 2098 if (maskflg && (opt_flags & OP_NET)) 2099 hints.ai_family = net->nt_net.ss_family; 2100 else if (!maskflg && (opt_flags & OP_HAVEMASK)) 2101 hints.ai_family = net->nt_mask.ss_family; 2102 else 2103 hints.ai_family = AF_UNSPEC; 2104 hints.ai_flags = AI_NUMERICHOST; 2105 if (getaddrinfo(cp, NULL, &hints, &ai) == 0) 2106 sa = ai->ai_addr; 2107 if (sa != NULL && ai->ai_family == AF_INET) { 2108 /* 2109 * The address in `cp' is really a network address, so 2110 * use inet_network() to re-interpret this correctly. 2111 * e.g. "127.1" means 127.1.0.0, not 127.0.0.1. 2112 */ 2113 bzero(&sin, sizeof sin); 2114 sin.sin_family = AF_INET; 2115 sin.sin_len = sizeof sin; 2116 sin.sin_addr = inet_makeaddr(inet_network(cp), 0); 2117 if (debug) 2118 fprintf(stderr, "get_net: v4 addr %s\n", 2119 inet_ntoa(sin.sin_addr)); 2120 sa = (struct sockaddr *)&sin; 2121 } 2122 } 2123 if (sa == NULL && (np = getnetbyname(cp)) != NULL) { 2124 bzero(&sin, sizeof sin); 2125 sin.sin_family = AF_INET; 2126 sin.sin_len = sizeof sin; 2127 sin.sin_addr = inet_makeaddr(np->n_net, 0); 2128 sa = (struct sockaddr *)&sin; 2129 } 2130 if (sa == NULL) 2131 goto fail; 2132 2133 if (maskflg) { 2134 /* The specified sockaddr is a mask. */ 2135 if (checkmask(sa) != 0) 2136 goto fail; 2137 bcopy(sa, &net->nt_mask, sa->sa_len); 2138 opt_flags |= OP_HAVEMASK; 2139 } else { 2140 /* The specified sockaddr is a network address. */ 2141 bcopy(sa, &net->nt_net, sa->sa_len); 2142 2143 /* Get a network name for the export list. */ 2144 if (np) { 2145 name = np->n_name; 2146 } else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname, 2147 NULL, 0, NI_NUMERICHOST) == 0) { 2148 name = netname; 2149 } else { 2150 goto fail; 2151 } 2152 if ((net->nt_name = strdup(name)) == NULL) 2153 out_of_mem(); 2154 2155 /* 2156 * Extract a mask from either a "/<masklen>" suffix, or 2157 * from the class of an IPv4 address. 2158 */ 2159 if (opt_flags & OP_MASKLEN) { 2160 preflen = strtol(prefp, NULL, 10); 2161 if (preflen < 0L || preflen == LONG_MAX) 2162 goto fail; 2163 bcopy(sa, &net->nt_mask, sa->sa_len); 2164 if (makemask(&net->nt_mask, (int)preflen) != 0) 2165 goto fail; 2166 opt_flags |= OP_HAVEMASK; 2167 *p = '/'; 2168 } else if (sa->sa_family == AF_INET && 2169 (opt_flags & OP_MASK) == 0) { 2170 in_addr_t addr; 2171 2172 addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr; 2173 if (IN_CLASSA(addr)) 2174 preflen = 8; 2175 else if (IN_CLASSB(addr)) 2176 preflen = 16; 2177 else if (IN_CLASSC(addr)) 2178 preflen = 24; 2179 else if (IN_CLASSD(addr)) 2180 preflen = 28; 2181 else 2182 preflen = 32; /* XXX */ 2183 2184 bcopy(sa, &net->nt_mask, sa->sa_len); 2185 makemask(&net->nt_mask, (int)preflen); 2186 opt_flags |= OP_HAVEMASK; 2187 } 2188 } 2189 2190 if (ai) 2191 freeaddrinfo(ai); 2192 return 0; 2193 2194 fail: 2195 if (ai) 2196 freeaddrinfo(ai); 2197 return 1; 2198 } 2199 2200 /* 2201 * Parse out the next white space separated field 2202 */ 2203 void 2204 nextfield(char **cp, char **endcp) 2205 { 2206 char *p; 2207 2208 p = *cp; 2209 while (*p == ' ' || *p == '\t') 2210 p++; 2211 if (*p == '\n' || *p == '\0') 2212 *cp = *endcp = p; 2213 else { 2214 *cp = p++; 2215 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0') 2216 p++; 2217 *endcp = p; 2218 } 2219 } 2220 2221 /* 2222 * Get an exports file line. Skip over blank lines and handle line 2223 * continuations. 2224 */ 2225 int 2226 get_line(void) 2227 { 2228 char *p, *cp; 2229 size_t len; 2230 int totlen, cont_line; 2231 2232 /* 2233 * Loop around ignoring blank lines and getting all continuation lines. 2234 */ 2235 p = line; 2236 totlen = 0; 2237 do { 2238 if ((p = fgetln(exp_file, &len)) == NULL) 2239 return (0); 2240 cp = p + len - 1; 2241 cont_line = 0; 2242 while (cp >= p && 2243 (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) { 2244 if (*cp == '\\') 2245 cont_line = 1; 2246 cp--; 2247 len--; 2248 } 2249 if (cont_line) { 2250 *++cp = ' '; 2251 len++; 2252 } 2253 if (linesize < len + totlen + 1) { 2254 linesize = len + totlen + 1; 2255 line = realloc(line, linesize); 2256 if (line == NULL) 2257 out_of_mem(); 2258 } 2259 memcpy(line + totlen, p, len); 2260 totlen += len; 2261 line[totlen] = '\0'; 2262 } while (totlen == 0 || cont_line); 2263 return (1); 2264 } 2265 2266 /* 2267 * Parse a description of a credential. 2268 */ 2269 void 2270 parsecred(char *namelist, struct ucred *cr) 2271 { 2272 char *name; 2273 int cnt; 2274 char *names; 2275 struct passwd *pw; 2276 struct group *gr; 2277 gid_t groups[NGROUPS + 1]; 2278 int ngroups; 2279 2280 /* 2281 * Set up the unprivileged user. 2282 */ 2283 cr->cr_ref = 1; 2284 cr->cr_uid = 65534; 2285 cr->cr_groups[0] = 65533; 2286 cr->cr_ngroups = 1; 2287 /* 2288 * Get the user's password table entry. 2289 */ 2290 names = strsep(&namelist, " \t\n"); 2291 name = strsep(&names, ":"); 2292 if (isdigit(*name) || *name == '-') 2293 pw = getpwuid(atoi(name)); 2294 else 2295 pw = getpwnam(name); 2296 /* 2297 * Credentials specified as those of a user. 2298 */ 2299 if (names == NULL) { 2300 if (pw == NULL) { 2301 syslog(LOG_ERR, "unknown user: %s", name); 2302 return; 2303 } 2304 cr->cr_uid = pw->pw_uid; 2305 ngroups = NGROUPS + 1; 2306 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups)) 2307 syslog(LOG_ERR, "too many groups"); 2308 /* 2309 * Compress out duplicate 2310 */ 2311 cr->cr_ngroups = ngroups - 1; 2312 cr->cr_groups[0] = groups[0]; 2313 for (cnt = 2; cnt < ngroups; cnt++) 2314 cr->cr_groups[cnt - 1] = groups[cnt]; 2315 return; 2316 } 2317 /* 2318 * Explicit credential specified as a colon separated list: 2319 * uid:gid:gid:... 2320 */ 2321 if (pw != NULL) 2322 cr->cr_uid = pw->pw_uid; 2323 else if (isdigit(*name) || *name == '-') 2324 cr->cr_uid = atoi(name); 2325 else { 2326 syslog(LOG_ERR, "unknown user: %s", name); 2327 return; 2328 } 2329 cr->cr_ngroups = 0; 2330 while (names != NULL && *names != '\0' && cr->cr_ngroups < NGROUPS) { 2331 name = strsep(&names, ":"); 2332 if (isdigit(*name) || *name == '-') { 2333 cr->cr_groups[cr->cr_ngroups++] = atoi(name); 2334 } else { 2335 if ((gr = getgrnam(name)) == NULL) { 2336 syslog(LOG_ERR, "unknown group: %s", name); 2337 continue; 2338 } 2339 cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid; 2340 } 2341 } 2342 if (names != NULL && *names != '\0' && cr->cr_ngroups == NGROUPS) 2343 syslog(LOG_ERR, "too many groups"); 2344 } 2345 2346 #define STRSIZ (RPCMNT_NAMELEN+RPCMNT_PATHLEN+50) 2347 /* 2348 * Routines that maintain the remote mounttab 2349 */ 2350 void 2351 get_mountlist(void) 2352 { 2353 struct mountlist *mlp, **mlpp; 2354 char *host, *dirp, *cp; 2355 char str[STRSIZ]; 2356 FILE *mlfile; 2357 2358 if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) { 2359 if (errno == ENOENT) 2360 return; 2361 else { 2362 syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST); 2363 return; 2364 } 2365 } 2366 mlpp = &mlhead; 2367 while (fgets(str, STRSIZ, mlfile) != NULL) { 2368 cp = str; 2369 host = strsep(&cp, " \t\n"); 2370 dirp = strsep(&cp, " \t\n"); 2371 if (host == NULL || dirp == NULL) 2372 continue; 2373 mlp = (struct mountlist *)malloc(sizeof (*mlp)); 2374 if (mlp == NULL) 2375 out_of_mem(); 2376 strncpy(mlp->ml_host, host, RPCMNT_NAMELEN); 2377 mlp->ml_host[RPCMNT_NAMELEN] = '\0'; 2378 strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN); 2379 mlp->ml_dirp[RPCMNT_PATHLEN] = '\0'; 2380 mlp->ml_next = NULL; 2381 *mlpp = mlp; 2382 mlpp = &mlp->ml_next; 2383 } 2384 fclose(mlfile); 2385 } 2386 2387 static 2388 void 2389 delete_export(struct statfs *fsp) 2390 { 2391 union { 2392 struct ufs_args ua; 2393 struct iso_args ia; 2394 struct mfs_args ma; 2395 struct msdosfs_args da; 2396 struct ntfs_args na; 2397 } targs; 2398 struct export_args export; 2399 2400 export.ex_flags = MNT_DELEXPORT; 2401 if (mountctl(fsp->f_mntonname, MOUNTCTL_SET_EXPORT, -1, 2402 &export, sizeof(export), NULL, 0) == 0) { 2403 /* ok */ 2404 } else if (!strcmp(fsp->f_fstypename, "mfs") || 2405 !strcmp(fsp->f_fstypename, "ufs") || 2406 !strcmp(fsp->f_fstypename, "msdos") || 2407 !strcmp(fsp->f_fstypename, "ntfs") || 2408 !strcmp(fsp->f_fstypename, "cd9660")) { 2409 bzero(&targs, sizeof targs); 2410 targs.ua.fspec = NULL; 2411 targs.ua.export.ex_flags = MNT_DELEXPORT; 2412 if (mount(fsp->f_fstypename, fsp->f_mntonname, 2413 fsp->f_flags | MNT_UPDATE, 2414 (caddr_t)&targs) < 0) 2415 syslog(LOG_ERR, "can't delete exports for %s", 2416 fsp->f_mntonname); 2417 } 2418 } 2419 2420 2421 void 2422 del_mlist(char *hostp, char *dirp) 2423 { 2424 struct mountlist *mlp, **mlpp; 2425 struct mountlist *mlp2; 2426 FILE *mlfile; 2427 int fnd = 0; 2428 2429 mlpp = &mlhead; 2430 mlp = mlhead; 2431 while (mlp) { 2432 if (!strcmp(mlp->ml_host, hostp) && 2433 (!dirp || !strcmp(mlp->ml_dirp, dirp))) { 2434 fnd = 1; 2435 mlp2 = mlp; 2436 *mlpp = mlp = mlp->ml_next; 2437 free((caddr_t)mlp2); 2438 } else { 2439 mlpp = &mlp->ml_next; 2440 mlp = mlp->ml_next; 2441 } 2442 } 2443 if (fnd) { 2444 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) { 2445 syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST); 2446 return; 2447 } 2448 mlp = mlhead; 2449 while (mlp) { 2450 fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp); 2451 mlp = mlp->ml_next; 2452 } 2453 fclose(mlfile); 2454 } 2455 } 2456 2457 void 2458 add_mlist(char *hostp, char *dirp) 2459 { 2460 struct mountlist *mlp, **mlpp; 2461 FILE *mlfile; 2462 2463 mlpp = &mlhead; 2464 mlp = mlhead; 2465 while (mlp) { 2466 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp)) 2467 return; 2468 mlpp = &mlp->ml_next; 2469 mlp = mlp->ml_next; 2470 } 2471 mlp = (struct mountlist *)malloc(sizeof (*mlp)); 2472 if (mlp == NULL) 2473 out_of_mem(); 2474 strncpy(mlp->ml_host, hostp, RPCMNT_NAMELEN); 2475 mlp->ml_host[RPCMNT_NAMELEN] = '\0'; 2476 strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN); 2477 mlp->ml_dirp[RPCMNT_PATHLEN] = '\0'; 2478 mlp->ml_next = NULL; 2479 *mlpp = mlp; 2480 if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) { 2481 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST); 2482 return; 2483 } 2484 fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp); 2485 fclose(mlfile); 2486 } 2487 2488 /* 2489 * Free up a group list. 2490 */ 2491 void 2492 free_grp(struct grouplist *grp) 2493 { 2494 if (grp->gr_type == GT_HOST) { 2495 if (grp->gr_ptr.gt_addrinfo != NULL) 2496 freeaddrinfo(grp->gr_ptr.gt_addrinfo); 2497 } else if (grp->gr_type == GT_NET) { 2498 if (grp->gr_ptr.gt_net.nt_name) 2499 free(grp->gr_ptr.gt_net.nt_name); 2500 } 2501 free((caddr_t)grp); 2502 } 2503 2504 #ifdef DEBUG 2505 void 2506 SYSLOG(int pri, const char *fmt, ...) 2507 { 2508 va_list ap; 2509 2510 va_start(ap, fmt); 2511 vfprintf(stderr, fmt, ap); 2512 va_end(ap); 2513 } 2514 #endif /* DEBUG */ 2515 2516 /* 2517 * Check options for consistency. 2518 */ 2519 int 2520 check_options(struct dirlist *dp) 2521 { 2522 2523 if (dp == NULL) 2524 return (1); 2525 if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL)) { 2526 syslog(LOG_ERR, "-mapall and -maproot mutually exclusive"); 2527 return (1); 2528 } 2529 if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) { 2530 syslog(LOG_ERR, "-mask requires -network"); 2531 return (1); 2532 } 2533 if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) { 2534 syslog(LOG_ERR, "-network requires mask specification"); 2535 return (1); 2536 } 2537 if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) { 2538 syslog(LOG_ERR, "-mask and /masklen are mutually exclusive"); 2539 return (1); 2540 } 2541 if ((opt_flags & OP_ALLDIRS) && dp->dp_left) { 2542 syslog(LOG_ERR, "-alldirs has multiple directories"); 2543 return (1); 2544 } 2545 return (0); 2546 } 2547 2548 /* 2549 * Check an absolute directory path for any symbolic links. Return true 2550 */ 2551 int 2552 check_dirpath(char *dirp) 2553 { 2554 char *cp; 2555 int ret = 1; 2556 struct stat sb; 2557 2558 cp = dirp + 1; 2559 while (*cp && ret) { 2560 if (*cp == '/') { 2561 *cp = '\0'; 2562 if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode)) 2563 ret = 0; 2564 *cp = '/'; 2565 } 2566 cp++; 2567 } 2568 if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode)) 2569 ret = 0; 2570 return (ret); 2571 } 2572 2573 /* 2574 * Make a netmask according to the specified prefix length. The ss_family 2575 * and other non-address fields must be initialised before calling this. 2576 */ 2577 int 2578 makemask(struct sockaddr_storage *ssp, int bitlen) 2579 { 2580 u_char *p; 2581 int bits, i, len; 2582 2583 if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL) 2584 return (-1); 2585 if (bitlen > len * CHAR_BIT) 2586 return (-1); 2587 for (i = 0; i < len; i++) { 2588 bits = (bitlen > CHAR_BIT) ? CHAR_BIT : bitlen; 2589 *p++ = (u_char)~0 << (CHAR_BIT - bits); 2590 bitlen -= bits; 2591 } 2592 return 0; 2593 } 2594 2595 /* 2596 * Check that the sockaddr is a valid netmask. Returns 0 if the mask 2597 * is acceptable (i.e. of the form 1...10....0). 2598 */ 2599 int 2600 checkmask(struct sockaddr *sa) 2601 { 2602 u_char *mask; 2603 int i, len; 2604 2605 if ((mask = sa_rawaddr(sa, &len)) == NULL) 2606 return (-1); 2607 2608 for (i = 0; i < len; i++) 2609 if (mask[i] != 0xff) 2610 break; 2611 if (i < len) { 2612 if (~mask[i] & (u_char)(~mask[i] + 1)) 2613 return (-1); 2614 i++; 2615 } 2616 for (; i < len; i++) 2617 if (mask[i] != 0) 2618 return (-1); 2619 return (0); 2620 } 2621 2622 /* 2623 * Compare two sockaddrs according to a specified mask. Return zero if 2624 * `sa1' matches `sa2' when filtered by the netmask in `samask'. 2625 * If samask is NULL, perform a full comparision. 2626 */ 2627 int 2628 sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask) 2629 { 2630 unsigned char *p1, *p2, *mask; 2631 int len, i; 2632 2633 if (sa1->sa_family != sa2->sa_family || 2634 (p1 = sa_rawaddr(sa1, &len)) == NULL || 2635 (p2 = sa_rawaddr(sa2, NULL)) == NULL) 2636 return (1); 2637 2638 switch (sa1->sa_family) { 2639 case AF_INET6: 2640 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id != 2641 ((struct sockaddr_in6 *)sa2)->sin6_scope_id) 2642 return (1); 2643 break; 2644 } 2645 2646 /* Simple binary comparison if no mask specified. */ 2647 if (samask == NULL) 2648 return (memcmp(p1, p2, len)); 2649 2650 /* Set up the mask, and do a mask-based comparison. */ 2651 if (sa1->sa_family != samask->sa_family || 2652 (mask = sa_rawaddr(samask, NULL)) == NULL) 2653 return (1); 2654 2655 for (i = 0; i < len; i++) 2656 if ((p1[i] & mask[i]) != (p2[i] & mask[i])) 2657 return (1); 2658 return (0); 2659 } 2660 2661 /* 2662 * Return a pointer to the part of the sockaddr that contains the 2663 * raw address, and set *nbytes to its length in bytes. Returns 2664 * NULL if the address family is unknown. 2665 */ 2666 void * 2667 sa_rawaddr(struct sockaddr *sa, int *nbytes) { 2668 void *p; 2669 int len; 2670 2671 switch (sa->sa_family) { 2672 case AF_INET: 2673 len = sizeof(((struct sockaddr_in *)sa)->sin_addr); 2674 p = &((struct sockaddr_in *)sa)->sin_addr; 2675 break; 2676 case AF_INET6: 2677 len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr); 2678 p = &((struct sockaddr_in6 *)sa)->sin6_addr; 2679 break; 2680 default: 2681 p = NULL; 2682 len = 0; 2683 } 2684 2685 if (nbytes != NULL) 2686 *nbytes = len; 2687 return (p); 2688 } 2689 2690 void 2691 huphandler1(int sig __unused) 2692 { 2693 got_sighup1 = 1; 2694 } 2695 2696 void 2697 huphandler2(int sig __unused) 2698 { 2699 got_sighup2 = 1; 2700 } 2701 2702 void terminate(int sig __unused) 2703 { 2704 pidfile_remove(pfh); 2705 rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL); 2706 rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL); 2707 exit (0); 2708 } 2709