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 transport. 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; 580 581 switch (res->ai_family) { 582 case AF_INET: 583 sin = malloc(sizeof(struct sockaddr_in)); 584 if (sin == NULL) 585 out_of_mem(); 586 sin->sin_family = AF_INET; 587 sin->sin_port = htons(0); 588 sin->sin_addr.s_addr = htonl(INADDR_ANY); 589 res->ai_addr = (struct sockaddr*) sin; 590 res->ai_addrlen = (socklen_t) 591 sizeof(res->ai_addr); 592 break; 593 case AF_INET6: 594 sin6 = malloc(sizeof(struct sockaddr_in6)); 595 if (sin6 == NULL) 596 out_of_mem(); 597 sin6->sin6_family = AF_INET6; 598 sin6->sin6_port = htons(0); 599 sin6->sin6_addr = in6addr_any; 600 res->ai_addr = (struct sockaddr*) sin6; 601 res->ai_addrlen = (socklen_t) 602 sizeof(res->ai_addr); 603 break; 604 default: 605 break; 606 } 607 } else { 608 if ((aicode = getaddrinfo(NULL, svcport_str, 609 &hints, &res)) != 0) { 610 syslog(LOG_ERR, 611 "cannot get local address for %s: %s", 612 nconf->nc_netid, 613 gai_strerror(aicode)); 614 continue; 615 } 616 } 617 } else { 618 if ((aicode = getaddrinfo(hosts[nhostsbak], svcport_str, 619 &hints, &res)) != 0) { 620 syslog(LOG_ERR, 621 "cannot get local address for %s: %s", 622 nconf->nc_netid, gai_strerror(aicode)); 623 continue; 624 } 625 } 626 627 /* 628 * Set SO_REUSEADDR only if binding to a specific port 629 */ 630 if (svcport_str) { 631 int on = 1; 632 633 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, 634 (char *)&on, sizeof(on)); 635 } 636 637 r = bindresvport_sa(fd, res->ai_addr); 638 if (r != 0) { 639 struct sockaddr_in *sin = (void *)res->ai_addr; 640 struct sockaddr_in6 *sin6 = (void *)res->ai_addr; 641 const char *protostr; 642 int portno; 643 644 switch(sin->sin_family) { 645 case AF_INET: 646 protostr = "inet"; 647 portno = ntohs(sin->sin_port); 648 break; 649 case AF_INET6: 650 protostr = "inet6"; 651 portno = ntohs(sin6->sin6_port); 652 break; 653 default: 654 protostr = "unknown"; 655 portno = -1; 656 break; 657 } 658 659 syslog(LOG_ERR, "bindresvport_sa: %m proto %s port %d", 660 protostr, portno); 661 exit(1); 662 } 663 664 if (nconf->nc_semantics != NC_TPI_CLTS) 665 listen(fd, SOMAXCONN); 666 667 if (nconf->nc_semantics == NC_TPI_CLTS ) 668 transp = svc_dg_create(fd, 0, 0); 669 else 670 transp = svc_vc_create(fd, RPC_MAXDATASIZE, 671 RPC_MAXDATASIZE); 672 673 if (transp != NULL) { 674 if (!svc_reg(transp, RPCPROG_MNT, RPCMNT_VER1, mntsrv, 675 NULL)) 676 syslog(LOG_ERR, 677 "can't register %s RPCMNT_VER1 service", 678 nconf->nc_netid); 679 if (!force_v2) { 680 if (!svc_reg(transp, RPCPROG_MNT, RPCMNT_VER3, 681 mntsrv, NULL)) 682 syslog(LOG_ERR, 683 "can't register %s RPCMNT_VER3 service", 684 nconf->nc_netid); 685 } 686 } else 687 syslog(LOG_WARNING, "can't create %s services", 688 nconf->nc_netid); 689 690 if (registered == 0) { 691 registered = 1; 692 memset(&hints, 0, sizeof hints); 693 hints.ai_flags = AI_PASSIVE; 694 hints.ai_family = si.si_af; 695 hints.ai_socktype = si.si_socktype; 696 hints.ai_protocol = si.si_proto; 697 698 if (svcport_str == NULL) { 699 svcport_str = malloc(NI_MAXSERV * sizeof(char)); 700 if (svcport_str == NULL) 701 out_of_mem(); 702 703 if (getnameinfo(res->ai_addr, 704 res->ai_addr->sa_len, NULL, NI_MAXHOST, 705 svcport_str, NI_MAXSERV * sizeof(char), 706 NI_NUMERICHOST | NI_NUMERICSERV)) 707 errx(1, "Cannot get port number"); 708 } 709 710 if((aicode = getaddrinfo(NULL, svcport_str, &hints, 711 &res)) != 0) { 712 syslog(LOG_ERR, "cannot get local address: %s", 713 gai_strerror(aicode)); 714 exit(1); 715 } 716 717 servaddr.buf = malloc(res->ai_addrlen); 718 memcpy(servaddr.buf, res->ai_addr, res->ai_addrlen); 719 servaddr.len = res->ai_addrlen; 720 721 rpcb_set(RPCPROG_MNT, RPCMNT_VER1, nconf, &servaddr); 722 rpcb_set(RPCPROG_MNT, RPCMNT_VER3, nconf, &servaddr); 723 724 xcreated++; 725 freeaddrinfo(res); 726 } 727 } /* end while */ 728 } 729 730 static void 731 usage(void) 732 { 733 fprintf(stderr, 734 "usage: mountd [-2] [-d] [-l] [-n] [-p <port>] [-r] " 735 "[-h <bindip>] [export_file ...]\n"); 736 exit(1); 737 } 738 739 /* 740 * The mount rpc service 741 */ 742 void 743 mntsrv(struct svc_req *rqstp, SVCXPRT *transp) 744 { 745 struct exportlist *ep; 746 struct dirlist *dp; 747 struct fhreturn fhr; 748 struct stat stb; 749 struct statfs fsb; 750 char host[NI_MAXHOST], numerichost[NI_MAXHOST]; 751 int lookup_failed = 1; 752 struct sockaddr *saddr; 753 u_short sport; 754 char rpcpath[RPCMNT_PATHLEN + 1], dirpath[MAXPATHLEN]; 755 int bad = 0, defset, hostset; 756 sigset_t sighup_mask; 757 758 sigemptyset(&sighup_mask); 759 sigaddset(&sighup_mask, SIGHUP); 760 761 saddr = svc_getrpccaller(transp)->buf; 762 switch (saddr->sa_family) { 763 case AF_INET6: 764 sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port); 765 break; 766 case AF_INET: 767 sport = ntohs(((struct sockaddr_in *)saddr)->sin_port); 768 break; 769 default: 770 syslog(LOG_ERR, "request from unknown address family"); 771 return; 772 } 773 lookup_failed = getnameinfo(saddr, saddr->sa_len, host, sizeof host, 774 NULL, 0, 0); 775 getnameinfo(saddr, saddr->sa_len, numerichost, 776 sizeof numerichost, NULL, 0, NI_NUMERICHOST); 777 switch (rqstp->rq_proc) { 778 case NULLPROC: 779 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL)) 780 syslog(LOG_ERR, "can't send reply"); 781 return; 782 case RPCMNT_MOUNT: 783 if (sport >= IPPORT_RESERVED && resvport_only) { 784 syslog(LOG_NOTICE, 785 "mount request from %s from unprivileged port", 786 numerichost); 787 svcerr_weakauth(transp); 788 return; 789 } 790 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) { 791 syslog(LOG_NOTICE, "undecodable mount request from %s", 792 numerichost); 793 svcerr_decode(transp); 794 return; 795 } 796 797 /* 798 * Get the real pathname and make sure it is a directory 799 * or a regular file if the -r option was specified 800 * and it exists. 801 */ 802 if (realpath(rpcpath, dirpath) == NULL || 803 stat(dirpath, &stb) < 0 || 804 (!S_ISDIR(stb.st_mode) && 805 (dir_only || !S_ISREG(stb.st_mode))) || 806 statfs(dirpath, &fsb) < 0) { 807 chdir("/"); /* Just in case realpath doesn't */ 808 syslog(LOG_NOTICE, 809 "mount request from %s for non existent path %s", 810 numerichost, dirpath); 811 if (debug) 812 warnx("stat failed on %s", dirpath); 813 bad = ENOENT; /* We will send error reply later */ 814 } 815 816 /* Check in the exports list */ 817 sigprocmask(SIG_BLOCK, &sighup_mask, NULL); 818 ep = ex_search(&fsb.f_fsid); 819 hostset = defset = 0; 820 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset) || 821 ((dp = dirp_search(ep->ex_dirl, dirpath)) && 822 chk_host(dp, saddr, &defset, &hostset)) || 823 (defset && scan_tree(ep->ex_defdir, saddr) == 0 && 824 scan_tree(ep->ex_dirl, saddr) == 0))) { 825 if (bad) { 826 if (!svc_sendreply(transp, (xdrproc_t)xdr_long, 827 &bad)) 828 syslog(LOG_ERR, "can't send reply"); 829 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 830 return; 831 } 832 if (hostset & DP_HOSTSET) 833 fhr.fhr_flag = hostset; 834 else 835 fhr.fhr_flag = defset; 836 fhr.fhr_vers = rqstp->rq_vers; 837 /* Get the file handle */ 838 memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t)); 839 if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) { 840 bad = errno; 841 syslog(LOG_ERR, "can't get fh for %s", dirpath); 842 if (!svc_sendreply(transp, (xdrproc_t)xdr_long, 843 &bad)) 844 syslog(LOG_ERR, "can't send reply"); 845 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 846 return; 847 } 848 if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs, &fhr)) 849 syslog(LOG_ERR, "can't send reply"); 850 if (!lookup_failed) 851 add_mlist(host, dirpath); 852 else 853 add_mlist(numerichost, dirpath); 854 if (debug) 855 warnx("mount successful"); 856 if (dolog) 857 syslog(LOG_NOTICE, 858 "mount request succeeded from %s for %s", 859 numerichost, dirpath); 860 } else { 861 bad = EACCES; 862 syslog(LOG_NOTICE, 863 "mount request denied from %s for %s", 864 numerichost, dirpath); 865 } 866 867 if (bad && !svc_sendreply(transp, (xdrproc_t)xdr_long, &bad)) 868 syslog(LOG_ERR, "can't send reply"); 869 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 870 return; 871 case RPCMNT_DUMP: 872 if (!svc_sendreply(transp, (xdrproc_t)xdr_mlist, NULL)) 873 syslog(LOG_ERR, "can't send reply"); 874 else if (dolog) 875 syslog(LOG_NOTICE, 876 "dump request succeeded from %s", 877 numerichost); 878 return; 879 case RPCMNT_UMOUNT: 880 if (sport >= IPPORT_RESERVED && resvport_only) { 881 syslog(LOG_NOTICE, 882 "umount request from %s from unprivileged port", 883 numerichost); 884 svcerr_weakauth(transp); 885 return; 886 } 887 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) { 888 syslog(LOG_NOTICE, "undecodable umount request from %s", 889 numerichost); 890 svcerr_decode(transp); 891 return; 892 } 893 if (realpath(rpcpath, dirpath) == NULL) { 894 syslog(LOG_NOTICE, "umount request from %s " 895 "for non existent path %s", 896 numerichost, dirpath); 897 } 898 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL)) 899 syslog(LOG_ERR, "can't send reply"); 900 if (!lookup_failed) 901 del_mlist(host, dirpath); 902 del_mlist(numerichost, dirpath); 903 if (dolog) 904 syslog(LOG_NOTICE, 905 "umount request succeeded from %s for %s", 906 numerichost, dirpath); 907 return; 908 case RPCMNT_UMNTALL: 909 if (sport >= IPPORT_RESERVED && resvport_only) { 910 syslog(LOG_NOTICE, 911 "umountall request from %s from unprivileged port", 912 numerichost); 913 svcerr_weakauth(transp); 914 return; 915 } 916 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL)) 917 syslog(LOG_ERR, "can't send reply"); 918 if (!lookup_failed) 919 del_mlist(host, NULL); 920 del_mlist(numerichost, NULL); 921 if (dolog) 922 syslog(LOG_NOTICE, 923 "umountall request succeeded from %s", 924 numerichost); 925 return; 926 case RPCMNT_EXPORT: 927 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, NULL)) 928 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist_brief, NULL)) 929 syslog(LOG_ERR, "can't send reply"); 930 if (dolog) 931 syslog(LOG_NOTICE, 932 "export request succeeded from %s", 933 numerichost); 934 return; 935 default: 936 svcerr_noproc(transp); 937 return; 938 } 939 } 940 941 /* 942 * Xdr conversion for a dirpath string 943 */ 944 int 945 xdr_dir(XDR *xdrsp, char *dirp) 946 { 947 return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN)); 948 } 949 950 /* 951 * Xdr routine to generate file handle reply 952 */ 953 int 954 xdr_fhs(XDR *xdrsp, caddr_t cp) 955 { 956 struct fhreturn *fhrp = (struct fhreturn *)cp; 957 long ok = 0, len, auth; 958 959 if (!xdr_long(xdrsp, &ok)) 960 return (0); 961 switch (fhrp->fhr_vers) { 962 case 1: 963 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH)); 964 case 3: 965 len = NFSX_V3FH; 966 if (!xdr_long(xdrsp, &len)) 967 return (0); 968 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len)) 969 return (0); 970 auth = RPCAUTH_UNIX; 971 len = 1; 972 if (!xdr_long(xdrsp, &len)) 973 return (0); 974 return (xdr_long(xdrsp, &auth)); 975 } 976 return (0); 977 } 978 979 int 980 xdr_mlist(XDR *xdrsp, caddr_t cp __unused) 981 { 982 struct mountlist *mlp; 983 int true = 1; 984 int false = 0; 985 char *strp; 986 987 mlp = mlhead; 988 while (mlp) { 989 if (!xdr_bool(xdrsp, &true)) 990 return (0); 991 strp = &mlp->ml_host[0]; 992 if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN)) 993 return (0); 994 strp = &mlp->ml_dirp[0]; 995 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN)) 996 return (0); 997 mlp = mlp->ml_next; 998 } 999 if (!xdr_bool(xdrsp, &false)) 1000 return (0); 1001 return (1); 1002 } 1003 1004 /* 1005 * Xdr conversion for export list 1006 */ 1007 int 1008 xdr_explist_common(XDR *xdrsp, caddr_t cp __unused, int brief) 1009 { 1010 struct exportlist *ep; 1011 int false = 0; 1012 int putdef; 1013 sigset_t sighup_mask; 1014 1015 sigemptyset(&sighup_mask); 1016 sigaddset(&sighup_mask, SIGHUP); 1017 sigaddset(&sighup_mask, SIGUSR1); 1018 sigprocmask(SIG_BLOCK, &sighup_mask, NULL); 1019 ep = exphead; 1020 while (ep) { 1021 putdef = 0; 1022 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir, 1023 &putdef, brief)) 1024 goto errout; 1025 if (ep->ex_defdir && putdef == 0 && 1026 put_exlist(ep->ex_defdir, xdrsp, NULL, 1027 &putdef, brief)) 1028 goto errout; 1029 ep = ep->ex_next; 1030 } 1031 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 1032 if (!xdr_bool(xdrsp, &false)) 1033 return (0); 1034 return (1); 1035 errout: 1036 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 1037 return (0); 1038 } 1039 1040 /* 1041 * Called from xdr_explist() to traverse the tree and export the 1042 * directory paths. 1043 */ 1044 int 1045 put_exlist(struct dirlist *dp, XDR *xdrsp, struct dirlist *adp, int *putdefp, int brief) 1046 { 1047 struct grouplist *grp; 1048 struct hostlist *hp; 1049 int true = 1; 1050 int false = 0; 1051 int gotalldir = 0; 1052 char *strp; 1053 1054 if (dp) { 1055 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp, brief)) 1056 return (1); 1057 if (!xdr_bool(xdrsp, &true)) 1058 return (1); 1059 strp = dp->dp_dirp; 1060 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN)) 1061 return (1); 1062 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) { 1063 gotalldir = 1; 1064 *putdefp = 1; 1065 } 1066 if (brief) { 1067 if (!xdr_bool(xdrsp, &true)) 1068 return (1); 1069 strp = "(...)"; 1070 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN)) 1071 return (1); 1072 } else if ((dp->dp_flag & DP_DEFSET) == 0 && 1073 (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) { 1074 hp = dp->dp_hosts; 1075 while (hp) { 1076 grp = hp->ht_grp; 1077 if (grp->gr_type == GT_HOST) { 1078 if (!xdr_bool(xdrsp, &true)) 1079 return (1); 1080 strp = grp->gr_ptr.gt_addrinfo->ai_canonname; 1081 if (!xdr_string(xdrsp, &strp, 1082 RPCMNT_NAMELEN)) 1083 return (1); 1084 } else if (grp->gr_type == GT_NET) { 1085 if (!xdr_bool(xdrsp, &true)) 1086 return (1); 1087 strp = grp->gr_ptr.gt_net.nt_name; 1088 if (!xdr_string(xdrsp, &strp, 1089 RPCMNT_NAMELEN)) 1090 return (1); 1091 } 1092 hp = hp->ht_next; 1093 if (gotalldir && hp == NULL) { 1094 hp = adp->dp_hosts; 1095 gotalldir = 0; 1096 } 1097 } 1098 } 1099 if (!xdr_bool(xdrsp, &false)) 1100 return (1); 1101 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp, brief)) 1102 return (1); 1103 } 1104 return (0); 1105 } 1106 1107 int 1108 xdr_explist(XDR *xdrsp, caddr_t cp) 1109 { 1110 1111 return xdr_explist_common(xdrsp, cp, 0); 1112 } 1113 1114 int 1115 xdr_explist_brief(XDR *xdrsp, caddr_t cp) 1116 { 1117 1118 return xdr_explist_common(xdrsp, cp, 1); 1119 } 1120 1121 char *line; 1122 size_t linesize; 1123 FILE *exp_file; 1124 1125 /* 1126 * Get the export list from one, currently open file 1127 */ 1128 static void 1129 get_exportlist_one(void) 1130 { 1131 struct exportlist *ep, *ep2; 1132 struct grouplist *grp, *tgrp; 1133 struct exportlist **epp; 1134 struct dirlist *dirhead; 1135 struct statfs fsb; 1136 struct ucred anon; 1137 char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc; 1138 int len, has_host, exflags, got_nondir, dirplen, netgrp; 1139 1140 dirhead = (struct dirlist *)NULL; 1141 while (get_line()) { 1142 if (debug) 1143 warnx("got line %s", line); 1144 cp = line; 1145 nextfield(&cp, &endcp); 1146 if (*cp == '#') 1147 goto nextline; 1148 1149 /* 1150 * Set defaults. 1151 */ 1152 has_host = FALSE; 1153 anon = def_anon; 1154 exflags = MNT_EXPORTED; 1155 got_nondir = 0; 1156 opt_flags = 0; 1157 ep = NULL; 1158 1159 /* 1160 * Create new exports list entry 1161 */ 1162 len = endcp-cp; 1163 tgrp = grp = get_grp(); 1164 while (len > 0) { 1165 if (len > RPCMNT_NAMELEN) { 1166 getexp_err(ep, tgrp); 1167 goto nextline; 1168 } 1169 if (*cp == '-') { 1170 if (ep == NULL) { 1171 getexp_err(ep, tgrp); 1172 goto nextline; 1173 } 1174 if (debug) 1175 warnx("doing opt %s", cp); 1176 got_nondir = 1; 1177 if (do_opt(&cp, &endcp, ep, grp, &has_host, 1178 &exflags, &anon)) { 1179 getexp_err(ep, tgrp); 1180 goto nextline; 1181 } 1182 } else if (*cp == '/') { 1183 savedc = *endcp; 1184 *endcp = '\0'; 1185 if (check_dirpath(cp) && 1186 statfs(cp, &fsb) >= 0) { 1187 if ((fsb.f_flags & MNT_AUTOMOUNTED) != 0) 1188 syslog(LOG_ERR, "Warning: exporting of " 1189 "automounted fs %s not supported", cp); 1190 if (got_nondir) { 1191 syslog(LOG_ERR, "dirs must be first"); 1192 getexp_err(ep, tgrp); 1193 goto nextline; 1194 } 1195 if (ep) { 1196 if (ep->ex_fs.val[0] != fsb.f_fsid.val[0] || 1197 ep->ex_fs.val[1] != fsb.f_fsid.val[1]) { 1198 getexp_err(ep, tgrp); 1199 goto nextline; 1200 } 1201 } else { 1202 /* 1203 * See if this directory is already 1204 * in the list. 1205 */ 1206 ep = ex_search(&fsb.f_fsid); 1207 if (ep == NULL) { 1208 ep = get_exp(); 1209 ep->ex_fs = fsb.f_fsid; 1210 ep->ex_fsdir = strdup(fsb.f_mntonname); 1211 if (ep->ex_fsdir == NULL) 1212 out_of_mem(); 1213 1214 delete_export(&fsb); 1215 1216 if (debug) 1217 warnx("making new ep fs=0x%x,0x%x", 1218 fsb.f_fsid.val[0], 1219 fsb.f_fsid.val[1]); 1220 } else if (debug) 1221 warnx("found ep fs=0x%x,0x%x", 1222 fsb.f_fsid.val[0], 1223 fsb.f_fsid.val[1]); 1224 } 1225 1226 /* 1227 * Add dirpath to export mount point. 1228 */ 1229 dirp = add_expdir(&dirhead, cp, len); 1230 dirplen = len; 1231 } else { 1232 getexp_err(ep, tgrp); 1233 goto nextline; 1234 } 1235 *endcp = savedc; 1236 } else { 1237 savedc = *endcp; 1238 *endcp = '\0'; 1239 got_nondir = 1; 1240 if (ep == NULL) { 1241 getexp_err(ep, tgrp); 1242 goto nextline; 1243 } 1244 1245 /* 1246 * Get the host or netgroup. 1247 */ 1248 setnetgrent(cp); 1249 netgrp = getnetgrent(&hst, &usr, &dom); 1250 do { 1251 if (has_host) { 1252 grp->gr_next = get_grp(); 1253 grp = grp->gr_next; 1254 } 1255 if (netgrp) { 1256 if (hst == NULL) { 1257 syslog(LOG_ERR, 1258 "null hostname in netgroup %s, skipping", cp); 1259 grp->gr_type = GT_IGNORE; 1260 } else if (get_host(hst, grp, tgrp)) { 1261 syslog(LOG_ERR, 1262 "bad host %s in netgroup %s, skipping", hst, cp); 1263 grp->gr_type = GT_IGNORE; 1264 } 1265 } else if (get_host(cp, grp, tgrp)) { 1266 syslog(LOG_ERR, "bad host %s, skipping", cp); 1267 grp->gr_type = GT_IGNORE; 1268 } 1269 has_host = TRUE; 1270 } while (netgrp && getnetgrent(&hst, &usr, &dom)); 1271 endnetgrent(); 1272 *endcp = savedc; 1273 } 1274 cp = endcp; 1275 nextfield(&cp, &endcp); 1276 len = endcp - cp; 1277 } 1278 if (check_options(dirhead)) { 1279 getexp_err(ep, tgrp); 1280 goto nextline; 1281 } 1282 if (!has_host) { 1283 grp->gr_type = GT_DEFAULT; 1284 if (debug) 1285 warnx("adding a default entry"); 1286 1287 /* 1288 * Don't allow a network export coincide with a list of 1289 * host(s) on the same line. 1290 */ 1291 } else if ((opt_flags & OP_NET) && tgrp->gr_next) { 1292 syslog(LOG_ERR, "network/host conflict"); 1293 getexp_err(ep, tgrp); 1294 goto nextline; 1295 1296 /* 1297 * If an export list was specified on this line, make sure 1298 * that we have at least one valid entry, otherwise skip it. 1299 */ 1300 } else { 1301 grp = tgrp; 1302 while (grp && grp->gr_type == GT_IGNORE) 1303 grp = grp->gr_next; 1304 if (! grp) { 1305 getexp_err(ep, tgrp); 1306 goto nextline; 1307 } 1308 } 1309 1310 /* 1311 * Loop through hosts, pushing the exports into the kernel. 1312 * After loop, tgrp points to the start of the list and 1313 * grp points to the last entry in the list. 1314 */ 1315 grp = tgrp; 1316 do { 1317 if (do_mount(ep, grp, exflags, &anon, dirp, dirplen, 1318 &fsb)) { 1319 getexp_err(ep, tgrp); 1320 goto nextline; 1321 } 1322 } while (grp->gr_next && (grp = grp->gr_next)); 1323 1324 /* 1325 * Success. Update the data structures. 1326 */ 1327 if (has_host) { 1328 hang_dirp(dirhead, tgrp, ep, opt_flags); 1329 grp->gr_next = grphead; 1330 grphead = tgrp; 1331 } else { 1332 hang_dirp(dirhead, NULL, ep, 1333 opt_flags); 1334 free_grp(grp); 1335 } 1336 dirhead = NULL; 1337 if ((ep->ex_flag & EX_LINKED) == 0) { 1338 ep2 = exphead; 1339 epp = &exphead; 1340 1341 /* 1342 * Insert in the list in alphabetical order. 1343 */ 1344 while (ep2 && strcmp(ep2->ex_fsdir, ep->ex_fsdir) < 0) { 1345 epp = &ep2->ex_next; 1346 ep2 = ep2->ex_next; 1347 } 1348 if (ep2) 1349 ep->ex_next = ep2; 1350 *epp = ep; 1351 ep->ex_flag |= EX_LINKED; 1352 } 1353 nextline: 1354 if (dirhead) { 1355 free_dir(dirhead); 1356 dirhead = NULL; 1357 } 1358 } 1359 fclose(exp_file); 1360 } 1361 1362 /* 1363 * Get the export list from all specified files. 1364 * 1365 * If incremental is non-zero we were signalled by mount and we do not 1366 * call mountctl() to blow away existing exports. 1367 */ 1368 void 1369 get_exportlist(int incremental) 1370 { 1371 struct exportlist *ep, *ep2; 1372 struct grouplist *grp, *tgrp; 1373 struct statfs *fsp, *mntbufp; 1374 struct vfsconf vfc; 1375 int num, i; 1376 int done; 1377 1378 /* 1379 * First, get rid of the old list 1380 */ 1381 ep = exphead; 1382 while (ep) { 1383 ep2 = ep; 1384 ep = ep->ex_next; 1385 free_exp(ep2); 1386 } 1387 exphead = NULL; 1388 1389 grp = grphead; 1390 while (grp) { 1391 tgrp = grp; 1392 grp = grp->gr_next; 1393 free_grp(tgrp); 1394 } 1395 grphead = NULL; 1396 1397 /* 1398 * And delete exports that are in the kernel for all local 1399 * filesystems. 1400 * XXX: Should know how to handle all local exportable filesystems. 1401 */ 1402 num = getmntinfo(&mntbufp, MNT_NOWAIT); 1403 for (i = 0; i < num; i++) { 1404 fsp = &mntbufp[i]; 1405 if (getvfsbyname(fsp->f_fstypename, &vfc) != 0) { 1406 syslog(LOG_ERR, "getvfsbyname() failed for %s", 1407 fsp->f_fstypename); 1408 continue; 1409 } 1410 1411 /* 1412 * Do not delete export for network filesystem by 1413 * passing "export" arg to mount(). 1414 * It only makes sense to do this for local filesystems. 1415 */ 1416 if (vfc.vfc_flags & VFCF_NETWORK) 1417 continue; 1418 1419 if (incremental == 0) 1420 delete_export(fsp); 1421 } 1422 1423 /* 1424 * Read in the exports file and build the list, calling 1425 * nmount() as we go along to push the export rules into the kernel. 1426 */ 1427 done = 0; 1428 for (i = 0; exnames[i] != NULL; i++) { 1429 if (debug) 1430 warnx("reading exports from %s", exnames[i]); 1431 if ((exp_file = fopen(exnames[i], "r")) == NULL) { 1432 syslog(LOG_WARNING, "can't open %s", exnames[i]); 1433 continue; 1434 } 1435 get_exportlist_one(); 1436 fclose(exp_file); 1437 done++; 1438 } 1439 if (done == 0) { 1440 syslog(LOG_ERR, "can't open any exports file"); 1441 exit(2); 1442 } 1443 } 1444 1445 /* 1446 * Allocate an export list element 1447 */ 1448 struct exportlist * 1449 get_exp(void) 1450 { 1451 struct exportlist *ep; 1452 1453 ep = (struct exportlist *)malloc(sizeof (struct exportlist)); 1454 if (ep == NULL) 1455 out_of_mem(); 1456 memset(ep, 0, sizeof(struct exportlist)); 1457 return (ep); 1458 } 1459 1460 /* 1461 * Allocate a group list element 1462 */ 1463 struct grouplist * 1464 get_grp(void) 1465 { 1466 struct grouplist *gp; 1467 1468 gp = (struct grouplist *)malloc(sizeof (struct grouplist)); 1469 if (gp == NULL) 1470 out_of_mem(); 1471 memset(gp, 0, sizeof(struct grouplist)); 1472 return (gp); 1473 } 1474 1475 /* 1476 * Clean up upon an error in get_exportlist(). 1477 */ 1478 void 1479 getexp_err(struct exportlist *ep, struct grouplist *grp) 1480 { 1481 struct grouplist *tgrp; 1482 1483 if (!(opt_flags & OP_QUIET)) 1484 syslog(LOG_ERR, "bad exports list line %s", line); 1485 if (ep && (ep->ex_flag & EX_LINKED) == 0) 1486 free_exp(ep); 1487 while (grp) { 1488 tgrp = grp; 1489 grp = grp->gr_next; 1490 free_grp(tgrp); 1491 } 1492 } 1493 1494 /* 1495 * Search the export list for a matching fs. 1496 */ 1497 struct exportlist * 1498 ex_search(fsid_t *fsid) 1499 { 1500 struct exportlist *ep; 1501 1502 ep = exphead; 1503 while (ep) { 1504 if (ep->ex_fs.val[0] == fsid->val[0] && 1505 ep->ex_fs.val[1] == fsid->val[1]) 1506 return (ep); 1507 ep = ep->ex_next; 1508 } 1509 return (ep); 1510 } 1511 1512 /* 1513 * Add a directory path to the list. 1514 */ 1515 char * 1516 add_expdir(struct dirlist **dpp, char *cp, int len) 1517 { 1518 struct dirlist *dp; 1519 1520 dp = malloc(sizeof (struct dirlist)); 1521 if (dp == (struct dirlist *)NULL) 1522 out_of_mem(); 1523 dp->dp_left = *dpp; 1524 dp->dp_right = (struct dirlist *)NULL; 1525 dp->dp_flag = 0; 1526 dp->dp_hosts = (struct hostlist *)NULL; 1527 dp->dp_dirp = strndup(cp, len); 1528 if (dp->dp_dirp == NULL) 1529 out_of_mem(); 1530 *dpp = dp; 1531 return (dp->dp_dirp); 1532 } 1533 1534 /* 1535 * Hang the dir list element off the dirpath binary tree as required 1536 * and update the entry for host. 1537 */ 1538 void 1539 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep, 1540 int flags) 1541 { 1542 struct hostlist *hp; 1543 struct dirlist *dp2; 1544 1545 if (flags & OP_ALLDIRS) { 1546 if (ep->ex_defdir) 1547 free((caddr_t)dp); 1548 else 1549 ep->ex_defdir = dp; 1550 if (grp == NULL) { 1551 ep->ex_defdir->dp_flag |= DP_DEFSET; 1552 } else while (grp) { 1553 hp = get_ht(); 1554 hp->ht_grp = grp; 1555 hp->ht_next = ep->ex_defdir->dp_hosts; 1556 ep->ex_defdir->dp_hosts = hp; 1557 grp = grp->gr_next; 1558 } 1559 } else { 1560 1561 /* 1562 * Loop through the directories adding them to the tree. 1563 */ 1564 while (dp) { 1565 dp2 = dp->dp_left; 1566 add_dlist(&ep->ex_dirl, dp, grp, flags); 1567 dp = dp2; 1568 } 1569 } 1570 } 1571 1572 /* 1573 * Traverse the binary tree either updating a node that is already there 1574 * for the new directory or adding the new node. 1575 */ 1576 void 1577 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp, 1578 int flags) 1579 { 1580 struct dirlist *dp; 1581 struct hostlist *hp; 1582 int cmp; 1583 1584 dp = *dpp; 1585 if (dp) { 1586 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp); 1587 if (cmp > 0) { 1588 add_dlist(&dp->dp_left, newdp, grp, flags); 1589 return; 1590 } else if (cmp < 0) { 1591 add_dlist(&dp->dp_right, newdp, grp, flags); 1592 return; 1593 } else 1594 free((caddr_t)newdp); 1595 } else { 1596 dp = newdp; 1597 dp->dp_left = NULL; 1598 *dpp = dp; 1599 } 1600 if (grp) { 1601 1602 /* 1603 * Hang all of the host(s) off of the directory point. 1604 */ 1605 do { 1606 hp = get_ht(); 1607 hp->ht_grp = grp; 1608 hp->ht_next = dp->dp_hosts; 1609 dp->dp_hosts = hp; 1610 grp = grp->gr_next; 1611 } while (grp); 1612 } else { 1613 dp->dp_flag |= DP_DEFSET; 1614 } 1615 } 1616 1617 /* 1618 * Search for a dirpath on the export point. 1619 */ 1620 struct dirlist * 1621 dirp_search(struct dirlist *dp, char *dirp) 1622 { 1623 int cmp; 1624 1625 if (dp) { 1626 cmp = strcmp(dp->dp_dirp, dirp); 1627 if (cmp > 0) 1628 return (dirp_search(dp->dp_left, dirp)); 1629 else if (cmp < 0) 1630 return (dirp_search(dp->dp_right, dirp)); 1631 else 1632 return (dp); 1633 } 1634 return (dp); 1635 } 1636 1637 /* 1638 * Scan for a host match in a directory tree. 1639 */ 1640 int 1641 chk_host(struct dirlist *dp, struct sockaddr *saddr, int *defsetp, 1642 int *hostsetp) 1643 { 1644 struct hostlist *hp; 1645 struct grouplist *grp; 1646 struct addrinfo *ai; 1647 1648 if (dp) { 1649 if (dp->dp_flag & DP_DEFSET) 1650 *defsetp = dp->dp_flag; 1651 hp = dp->dp_hosts; 1652 while (hp) { 1653 grp = hp->ht_grp; 1654 switch (grp->gr_type) { 1655 case GT_HOST: 1656 ai = grp->gr_ptr.gt_addrinfo; 1657 for (; ai; ai = ai->ai_next) { 1658 if (!sacmp(ai->ai_addr, saddr, NULL)) { 1659 *hostsetp = 1660 (hp->ht_flag | DP_HOSTSET); 1661 return (1); 1662 } 1663 } 1664 break; 1665 case GT_NET: 1666 if (!sacmp(saddr, (struct sockaddr *) 1667 &grp->gr_ptr.gt_net.nt_net, 1668 (struct sockaddr *) 1669 &grp->gr_ptr.gt_net.nt_mask)) { 1670 *hostsetp = (hp->ht_flag | DP_HOSTSET); 1671 return (1); 1672 } 1673 break; 1674 } 1675 hp = hp->ht_next; 1676 } 1677 } 1678 return (0); 1679 } 1680 1681 /* 1682 * Scan tree for a host that matches the address. 1683 */ 1684 int 1685 scan_tree(struct dirlist *dp, struct sockaddr *saddr) 1686 { 1687 int defset, hostset; 1688 1689 if (dp) { 1690 if (scan_tree(dp->dp_left, saddr)) 1691 return (1); 1692 if (chk_host(dp, saddr, &defset, &hostset)) 1693 return (1); 1694 if (scan_tree(dp->dp_right, saddr)) 1695 return (1); 1696 } 1697 return (0); 1698 } 1699 1700 /* 1701 * Traverse the dirlist tree and free it up. 1702 */ 1703 void 1704 free_dir(struct dirlist *dp) 1705 { 1706 1707 if (dp) { 1708 free_dir(dp->dp_left); 1709 free_dir(dp->dp_right); 1710 free_host(dp->dp_hosts); 1711 free(dp->dp_dirp); 1712 free(dp); 1713 } 1714 } 1715 1716 /* 1717 * Parse the option string and update fields. 1718 * Option arguments may either be -<option>=<value> or 1719 * -<option> <value> 1720 */ 1721 int 1722 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp, 1723 int *has_hostp, int *exflagsp, struct ucred *cr) 1724 { 1725 char *cpoptarg, *cpoptend; 1726 char *cp, *endcp, *cpopt, savedc, savedc2; 1727 int allflag, usedarg; 1728 1729 savedc2 = '\0'; 1730 cpopt = *cpp; 1731 cpopt++; 1732 cp = *endcpp; 1733 savedc = *cp; 1734 *cp = '\0'; 1735 while (cpopt && *cpopt) { 1736 allflag = 1; 1737 usedarg = -2; 1738 if ((cpoptend = strchr(cpopt, ','))) { 1739 *cpoptend++ = '\0'; 1740 if ((cpoptarg = strchr(cpopt, '='))) 1741 *cpoptarg++ = '\0'; 1742 } else { 1743 if ((cpoptarg = strchr(cpopt, '='))) 1744 *cpoptarg++ = '\0'; 1745 else { 1746 *cp = savedc; 1747 nextfield(&cp, &endcp); 1748 **endcpp = '\0'; 1749 if (endcp > cp && *cp != '-') { 1750 cpoptarg = cp; 1751 savedc2 = *endcp; 1752 *endcp = '\0'; 1753 usedarg = 0; 1754 } 1755 } 1756 } 1757 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) { 1758 *exflagsp |= MNT_EXRDONLY; 1759 } else if (cpoptarg && (!strcmp(cpopt, "maproot") || 1760 !(allflag = strcmp(cpopt, "mapall")) || 1761 !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) { 1762 usedarg++; 1763 parsecred(cpoptarg, cr); 1764 if (allflag == 0) { 1765 *exflagsp |= MNT_EXPORTANON; 1766 opt_flags |= OP_MAPALL; 1767 } else 1768 opt_flags |= OP_MAPROOT; 1769 } else if (cpoptarg && (!strcmp(cpopt, "mask") || 1770 !strcmp(cpopt, "m"))) { 1771 if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) { 1772 syslog(LOG_ERR, "bad mask: %s", cpoptarg); 1773 return (1); 1774 } 1775 usedarg++; 1776 opt_flags |= OP_MASK; 1777 } else if (cpoptarg && (!strcmp(cpopt, "network") || 1778 !strcmp(cpopt, "n"))) { 1779 if (strchr(cpoptarg, '/') != NULL) { 1780 if (debug) 1781 fprintf(stderr, "setting OP_MASKLEN\n"); 1782 opt_flags |= OP_MASKLEN; 1783 } 1784 if (grp->gr_type != GT_NULL) { 1785 syslog(LOG_ERR, "network/host conflict"); 1786 return (1); 1787 } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) { 1788 syslog(LOG_ERR, "bad net: %s", cpoptarg); 1789 return (1); 1790 } 1791 grp->gr_type = GT_NET; 1792 *has_hostp = 1; 1793 usedarg++; 1794 opt_flags |= OP_NET; 1795 } else if (!strcmp(cpopt, "alldirs")) { 1796 opt_flags |= OP_ALLDIRS; 1797 } else if (!strcmp(cpopt, "public")) { 1798 *exflagsp |= MNT_EXPUBLIC; 1799 } else if (!strcmp(cpopt, "webnfs")) { 1800 *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON); 1801 opt_flags |= OP_MAPALL; 1802 } else if (cpoptarg && !strcmp(cpopt, "index")) { 1803 ep->ex_indexfile = strdup(cpoptarg); 1804 } else if (!strcmp(cpopt, "quiet")) { 1805 opt_flags |= OP_QUIET; 1806 } else { 1807 syslog(LOG_ERR, "bad opt %s", cpopt); 1808 return (1); 1809 } 1810 if (usedarg >= 0) { 1811 *endcp = savedc2; 1812 **endcpp = savedc; 1813 if (usedarg > 0) { 1814 *cpp = cp; 1815 *endcpp = endcp; 1816 } 1817 return (0); 1818 } 1819 cpopt = cpoptend; 1820 } 1821 **endcpp = savedc; 1822 return (0); 1823 } 1824 1825 /* 1826 * Translate a character string to the corresponding list of network 1827 * addresses for a hostname. 1828 */ 1829 int 1830 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp) 1831 { 1832 struct grouplist *checkgrp; 1833 struct addrinfo *ai, *tai, hints; 1834 int ecode; 1835 char host[NI_MAXHOST]; 1836 1837 if (grp->gr_type != GT_NULL) { 1838 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp); 1839 return (1); 1840 } 1841 memset(&hints, 0, sizeof hints); 1842 hints.ai_flags = AI_CANONNAME; 1843 hints.ai_protocol = IPPROTO_UDP; 1844 ecode = getaddrinfo(cp, NULL, &hints, &ai); 1845 if (ecode != 0) { 1846 syslog(LOG_ERR,"can't get address info for host %s", cp); 1847 return 1; 1848 } 1849 grp->gr_ptr.gt_addrinfo = ai; 1850 while (ai != NULL) { 1851 if (ai->ai_canonname == NULL) { 1852 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host, 1853 sizeof host, NULL, 0, NI_NUMERICHOST) != 0) 1854 strlcpy(host, "?", sizeof(host)); 1855 ai->ai_canonname = strdup(host); 1856 ai->ai_flags |= AI_CANONNAME; 1857 } 1858 if (debug) 1859 fprintf(stderr, "got host %s\n", ai->ai_canonname); 1860 /* 1861 * Sanity check: make sure we don't already have an entry 1862 * for this host in the grouplist. 1863 */ 1864 for (checkgrp = tgrp; checkgrp != NULL; 1865 checkgrp = checkgrp->gr_next) { 1866 if (checkgrp->gr_type != GT_HOST) 1867 continue; 1868 for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL; 1869 tai = tai->ai_next) { 1870 if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0) 1871 continue; 1872 if (debug) 1873 fprintf(stderr, 1874 "ignoring duplicate host %s\n", 1875 ai->ai_canonname); 1876 grp->gr_type = GT_IGNORE; 1877 return (0); 1878 } 1879 } 1880 ai = ai->ai_next; 1881 } 1882 grp->gr_type = GT_HOST; 1883 return (0); 1884 } 1885 1886 /* 1887 * Free up an exports list component 1888 */ 1889 void 1890 free_exp(struct exportlist *ep) 1891 { 1892 1893 if (ep->ex_defdir) { 1894 free_host(ep->ex_defdir->dp_hosts); 1895 free((caddr_t)ep->ex_defdir); 1896 } 1897 if (ep->ex_fsdir) 1898 free(ep->ex_fsdir); 1899 if (ep->ex_indexfile) 1900 free(ep->ex_indexfile); 1901 free_dir(ep->ex_dirl); 1902 free((caddr_t)ep); 1903 } 1904 1905 /* 1906 * Free hosts. 1907 */ 1908 void 1909 free_host(struct hostlist *hp) 1910 { 1911 struct hostlist *hp2; 1912 1913 while (hp) { 1914 hp2 = hp; 1915 hp = hp->ht_next; 1916 free((caddr_t)hp2); 1917 } 1918 } 1919 1920 struct hostlist * 1921 get_ht(void) 1922 { 1923 struct hostlist *hp; 1924 1925 hp = (struct hostlist *)malloc(sizeof (struct hostlist)); 1926 if (hp == NULL) 1927 out_of_mem(); 1928 hp->ht_next = NULL; 1929 hp->ht_flag = 0; 1930 return (hp); 1931 } 1932 1933 /* 1934 * Out of memory, fatal 1935 */ 1936 void 1937 out_of_mem(void) 1938 { 1939 1940 syslog(LOG_ERR, "out of memory"); 1941 exit(2); 1942 } 1943 1944 /* 1945 * Do the mount syscall with the update flag to push the export info into 1946 * the kernel. 1947 */ 1948 int 1949 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags, 1950 struct ucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb) 1951 { 1952 struct statfs fsb1; 1953 struct addrinfo *ai; 1954 struct export_args *eap; 1955 char *cp = NULL; 1956 int done; 1957 char savedc = '\0'; 1958 union { 1959 struct ufs_args ua; 1960 struct iso_args ia; 1961 struct mfs_args ma; 1962 struct msdosfs_args da; 1963 struct ntfs_args na; 1964 } args; 1965 1966 bzero(&args, sizeof args); 1967 /* XXX, we assume that all xx_args look like ufs_args. */ 1968 args.ua.fspec = 0; 1969 eap = &args.ua.export; 1970 1971 eap->ex_flags = exflags; 1972 eap->ex_anon = *anoncrp; 1973 eap->ex_indexfile = ep->ex_indexfile; 1974 if (grp->gr_type == GT_HOST) 1975 ai = grp->gr_ptr.gt_addrinfo; 1976 else 1977 ai = NULL; 1978 done = FALSE; 1979 while (!done) { 1980 switch (grp->gr_type) { 1981 case GT_HOST: 1982 if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0) 1983 goto skip; 1984 eap->ex_addr = ai->ai_addr; 1985 eap->ex_addrlen = ai->ai_addrlen; 1986 eap->ex_masklen = 0; 1987 break; 1988 case GT_NET: 1989 if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 && 1990 have_v6 == 0) 1991 goto skip; 1992 eap->ex_addr = 1993 (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net; 1994 eap->ex_addrlen = args.ua.export.ex_addr->sa_len; 1995 eap->ex_mask = 1996 (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask; 1997 eap->ex_masklen = args.ua.export.ex_mask->sa_len; 1998 break; 1999 case GT_DEFAULT: 2000 eap->ex_addr = NULL; 2001 eap->ex_addrlen = 0; 2002 eap->ex_mask = NULL; 2003 eap->ex_masklen = 0; 2004 break; 2005 case GT_IGNORE: 2006 return(0); 2007 break; 2008 default: 2009 syslog(LOG_ERR, "bad grouptype"); 2010 if (cp) 2011 *cp = savedc; 2012 return (1); 2013 } 2014 2015 /* 2016 * XXX: 2017 * Maybe I should just use the fsb->f_mntonname path instead 2018 * of looping back up the dirp to the mount point?? 2019 * Also, needs to know how to export all types of local 2020 * exportable filesystems and not just "ufs". 2021 */ 2022 for (;;) { 2023 int r; 2024 2025 r = mountctl(fsb->f_mntonname, MOUNTCTL_SET_EXPORT, 2026 -1, 2027 &args.ua.export, sizeof(args.ua.export), 2028 NULL, 0); 2029 if (r < 0 && errno == EOPNOTSUPP) { 2030 r = mount(fsb->f_fstypename, dirp, 2031 fsb->f_flags | MNT_UPDATE, 2032 (caddr_t)&args); 2033 } 2034 if (r >= 0) 2035 break; 2036 if (cp) 2037 *cp-- = savedc; 2038 else 2039 cp = dirp + dirplen - 1; 2040 if (opt_flags & OP_QUIET) 2041 return (1); 2042 if (errno == EPERM) { 2043 if (debug) 2044 warnx("can't change attributes for %s", 2045 dirp); 2046 syslog(LOG_ERR, 2047 "can't change attributes for %s", dirp); 2048 return (1); 2049 } 2050 if (opt_flags & OP_ALLDIRS) { 2051 if (errno == EINVAL) 2052 syslog(LOG_ERR, 2053 "-alldirs requested but %s is not a filesystem mountpoint", 2054 dirp); 2055 else 2056 syslog(LOG_ERR, 2057 "could not remount %s: %m", 2058 dirp); 2059 return (1); 2060 } 2061 /* back up over the last component */ 2062 while (*cp == '/' && cp > dirp) 2063 cp--; 2064 while (*(cp - 1) != '/' && cp > dirp) 2065 cp--; 2066 if (cp == dirp) { 2067 if (debug) 2068 warnx("mnt unsucc"); 2069 syslog(LOG_ERR, "can't export %s", dirp); 2070 return (1); 2071 } 2072 savedc = *cp; 2073 *cp = '\0'; 2074 /* Check that we're still on the same filesystem. */ 2075 if (statfs(dirp, &fsb1) != 0 || bcmp(&fsb1.f_fsid, 2076 &fsb->f_fsid, sizeof(fsb1.f_fsid)) != 0) { 2077 *cp = savedc; 2078 syslog(LOG_ERR, "can't export %s", dirp); 2079 return (1); 2080 } 2081 } 2082 skip: 2083 if (ai != NULL) 2084 ai = ai->ai_next; 2085 if (ai == NULL) 2086 done = TRUE; 2087 } 2088 if (cp) 2089 *cp = savedc; 2090 return (0); 2091 } 2092 2093 /* 2094 * Translate a net address. 2095 * 2096 * If `maskflg' is nonzero, then `cp' is a netmask, not a network address. 2097 */ 2098 int 2099 get_net(char *cp, struct netmsk *net, int maskflg) 2100 { 2101 struct netent *np = NULL; 2102 char *name, *p, *prefp; 2103 struct sockaddr_in sin; 2104 struct sockaddr *sa = NULL; 2105 struct addrinfo hints, *ai = NULL; 2106 char netname[NI_MAXHOST]; 2107 long preflen; 2108 2109 p = prefp = NULL; 2110 if ((opt_flags & OP_MASKLEN) && !maskflg) { 2111 p = strchr(cp, '/'); 2112 *p = '\0'; 2113 prefp = p + 1; 2114 } 2115 2116 /* 2117 * Check for a numeric address first. We wish to avoid 2118 * possible DNS lookups in getnetbyname(). 2119 */ 2120 if (isxdigit(*cp) || *cp == ':') { 2121 memset(&hints, 0, sizeof hints); 2122 /* Ensure the mask and the network have the same family. */ 2123 if (maskflg && (opt_flags & OP_NET)) 2124 hints.ai_family = net->nt_net.ss_family; 2125 else if (!maskflg && (opt_flags & OP_HAVEMASK)) 2126 hints.ai_family = net->nt_mask.ss_family; 2127 else 2128 hints.ai_family = AF_UNSPEC; 2129 hints.ai_flags = AI_NUMERICHOST; 2130 if (getaddrinfo(cp, NULL, &hints, &ai) == 0) 2131 sa = ai->ai_addr; 2132 if (sa != NULL && ai->ai_family == AF_INET) { 2133 /* 2134 * The address in `cp' is really a network address, so 2135 * use inet_network() to re-interpret this correctly. 2136 * e.g. "127.1" means 127.1.0.0, not 127.0.0.1. 2137 */ 2138 bzero(&sin, sizeof sin); 2139 sin.sin_family = AF_INET; 2140 sin.sin_len = sizeof sin; 2141 sin.sin_addr = inet_makeaddr(inet_network(cp), 0); 2142 if (debug) 2143 fprintf(stderr, "get_net: v4 addr %s\n", 2144 inet_ntoa(sin.sin_addr)); 2145 sa = (struct sockaddr *)&sin; 2146 } 2147 } 2148 if (sa == NULL && (np = getnetbyname(cp)) != NULL) { 2149 bzero(&sin, sizeof sin); 2150 sin.sin_family = AF_INET; 2151 sin.sin_len = sizeof sin; 2152 sin.sin_addr = inet_makeaddr(np->n_net, 0); 2153 sa = (struct sockaddr *)&sin; 2154 } 2155 if (sa == NULL) 2156 goto fail; 2157 2158 if (maskflg) { 2159 /* The specified sockaddr is a mask. */ 2160 if (checkmask(sa) != 0) 2161 goto fail; 2162 bcopy(sa, &net->nt_mask, sa->sa_len); 2163 opt_flags |= OP_HAVEMASK; 2164 } else { 2165 /* The specified sockaddr is a network address. */ 2166 bcopy(sa, &net->nt_net, sa->sa_len); 2167 2168 /* Get a network name for the export list. */ 2169 if (np) { 2170 name = np->n_name; 2171 } else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname, 2172 NULL, 0, NI_NUMERICHOST) == 0) { 2173 name = netname; 2174 } else { 2175 goto fail; 2176 } 2177 if ((net->nt_name = strdup(name)) == NULL) 2178 out_of_mem(); 2179 2180 /* 2181 * Extract a mask from either a "/<masklen>" suffix, or 2182 * from the class of an IPv4 address. 2183 */ 2184 if (opt_flags & OP_MASKLEN) { 2185 preflen = strtol(prefp, NULL, 10); 2186 if (preflen < 0L || preflen == LONG_MAX) 2187 goto fail; 2188 bcopy(sa, &net->nt_mask, sa->sa_len); 2189 if (makemask(&net->nt_mask, (int)preflen) != 0) 2190 goto fail; 2191 opt_flags |= OP_HAVEMASK; 2192 *p = '/'; 2193 } else if (sa->sa_family == AF_INET && 2194 (opt_flags & OP_MASK) == 0) { 2195 in_addr_t addr; 2196 2197 addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr; 2198 if (IN_CLASSA(addr)) 2199 preflen = 8; 2200 else if (IN_CLASSB(addr)) 2201 preflen = 16; 2202 else if (IN_CLASSC(addr)) 2203 preflen = 24; 2204 else if (IN_CLASSD(addr)) 2205 preflen = 28; 2206 else 2207 preflen = 32; /* XXX */ 2208 2209 bcopy(sa, &net->nt_mask, sa->sa_len); 2210 makemask(&net->nt_mask, (int)preflen); 2211 opt_flags |= OP_HAVEMASK; 2212 } 2213 } 2214 2215 if (ai) 2216 freeaddrinfo(ai); 2217 return 0; 2218 2219 fail: 2220 if (ai) 2221 freeaddrinfo(ai); 2222 return 1; 2223 } 2224 2225 /* 2226 * Parse out the next white space separated field 2227 */ 2228 void 2229 nextfield(char **cp, char **endcp) 2230 { 2231 char *p; 2232 2233 p = *cp; 2234 while (*p == ' ' || *p == '\t') 2235 p++; 2236 if (*p == '\n' || *p == '\0') 2237 *cp = *endcp = p; 2238 else { 2239 *cp = p++; 2240 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0') 2241 p++; 2242 *endcp = p; 2243 } 2244 } 2245 2246 /* 2247 * Get an exports file line. Skip over blank lines and handle line 2248 * continuations. 2249 */ 2250 int 2251 get_line(void) 2252 { 2253 char *p, *cp; 2254 size_t len; 2255 int totlen, cont_line; 2256 2257 /* 2258 * Loop around ignoring blank lines and getting all continuation lines. 2259 */ 2260 p = line; 2261 totlen = 0; 2262 do { 2263 if ((p = fgetln(exp_file, &len)) == NULL) 2264 return (0); 2265 cp = p + len - 1; 2266 cont_line = 0; 2267 while (cp >= p && 2268 (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) { 2269 if (*cp == '\\') 2270 cont_line = 1; 2271 cp--; 2272 len--; 2273 } 2274 if (cont_line) { 2275 *++cp = ' '; 2276 len++; 2277 } 2278 if (linesize < len + totlen + 1) { 2279 linesize = len + totlen + 1; 2280 line = realloc(line, linesize); 2281 if (line == NULL) 2282 out_of_mem(); 2283 } 2284 memcpy(line + totlen, p, len); 2285 totlen += len; 2286 line[totlen] = '\0'; 2287 } while (totlen == 0 || cont_line); 2288 return (1); 2289 } 2290 2291 /* 2292 * Parse a description of a credential. 2293 */ 2294 void 2295 parsecred(char *namelist, struct ucred *cr) 2296 { 2297 char *name; 2298 int cnt; 2299 char *names; 2300 struct passwd *pw; 2301 struct group *gr; 2302 gid_t groups[NGROUPS + 1]; 2303 int ngroups; 2304 2305 /* 2306 * Set up the unprivileged user. 2307 */ 2308 cr->cr_ref = 1; 2309 cr->cr_uid = 65534; 2310 cr->cr_groups[0] = 65533; 2311 cr->cr_ngroups = 1; 2312 /* 2313 * Get the user's password table entry. 2314 */ 2315 names = strsep(&namelist, " \t\n"); 2316 name = strsep(&names, ":"); 2317 if (isdigit(*name) || *name == '-') 2318 pw = getpwuid(atoi(name)); 2319 else 2320 pw = getpwnam(name); 2321 /* 2322 * Credentials specified as those of a user. 2323 */ 2324 if (names == NULL) { 2325 if (pw == NULL) { 2326 syslog(LOG_ERR, "unknown user: %s", name); 2327 return; 2328 } 2329 cr->cr_uid = pw->pw_uid; 2330 ngroups = NGROUPS + 1; 2331 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups)) 2332 syslog(LOG_ERR, "too many groups"); 2333 /* 2334 * Compress out duplicate 2335 */ 2336 cr->cr_ngroups = ngroups - 1; 2337 cr->cr_groups[0] = groups[0]; 2338 for (cnt = 2; cnt < ngroups; cnt++) 2339 cr->cr_groups[cnt - 1] = groups[cnt]; 2340 return; 2341 } 2342 /* 2343 * Explicit credential specified as a colon separated list: 2344 * uid:gid:gid:... 2345 */ 2346 if (pw != NULL) 2347 cr->cr_uid = pw->pw_uid; 2348 else if (isdigit(*name) || *name == '-') 2349 cr->cr_uid = atoi(name); 2350 else { 2351 syslog(LOG_ERR, "unknown user: %s", name); 2352 return; 2353 } 2354 cr->cr_ngroups = 0; 2355 while (names != NULL && *names != '\0' && cr->cr_ngroups < NGROUPS) { 2356 name = strsep(&names, ":"); 2357 if (isdigit(*name) || *name == '-') { 2358 cr->cr_groups[cr->cr_ngroups++] = atoi(name); 2359 } else { 2360 if ((gr = getgrnam(name)) == NULL) { 2361 syslog(LOG_ERR, "unknown group: %s", name); 2362 continue; 2363 } 2364 cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid; 2365 } 2366 } 2367 if (names != NULL && *names != '\0' && cr->cr_ngroups == NGROUPS) 2368 syslog(LOG_ERR, "too many groups"); 2369 } 2370 2371 #define STRSIZ (RPCMNT_NAMELEN+RPCMNT_PATHLEN+50) 2372 /* 2373 * Routines that maintain the remote mounttab 2374 */ 2375 void 2376 get_mountlist(void) 2377 { 2378 struct mountlist *mlp, **mlpp; 2379 char *host, *dirp, *cp; 2380 char str[STRSIZ]; 2381 FILE *mlfile; 2382 2383 if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) { 2384 if (errno == ENOENT) 2385 return; 2386 else { 2387 syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST); 2388 return; 2389 } 2390 } 2391 mlpp = &mlhead; 2392 while (fgets(str, STRSIZ, mlfile) != NULL) { 2393 cp = str; 2394 host = strsep(&cp, " \t\n"); 2395 dirp = strsep(&cp, " \t\n"); 2396 if (host == NULL || dirp == NULL) 2397 continue; 2398 mlp = (struct mountlist *)malloc(sizeof (*mlp)); 2399 if (mlp == NULL) 2400 out_of_mem(); 2401 strncpy(mlp->ml_host, host, RPCMNT_NAMELEN); 2402 mlp->ml_host[RPCMNT_NAMELEN] = '\0'; 2403 strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN); 2404 mlp->ml_dirp[RPCMNT_PATHLEN] = '\0'; 2405 mlp->ml_next = NULL; 2406 *mlpp = mlp; 2407 mlpp = &mlp->ml_next; 2408 } 2409 fclose(mlfile); 2410 } 2411 2412 static 2413 void 2414 delete_export(struct statfs *fsp) 2415 { 2416 union { 2417 struct ufs_args ua; 2418 struct iso_args ia; 2419 struct mfs_args ma; 2420 struct msdosfs_args da; 2421 struct ntfs_args na; 2422 } targs; 2423 struct export_args export; 2424 2425 export.ex_flags = MNT_DELEXPORT; 2426 if (mountctl(fsp->f_mntonname, MOUNTCTL_SET_EXPORT, -1, 2427 &export, sizeof(export), NULL, 0) == 0) { 2428 /* ok */ 2429 } else if (!strcmp(fsp->f_fstypename, "mfs") || 2430 !strcmp(fsp->f_fstypename, "ufs") || 2431 !strcmp(fsp->f_fstypename, "msdos") || 2432 !strcmp(fsp->f_fstypename, "ntfs") || 2433 !strcmp(fsp->f_fstypename, "cd9660")) { 2434 bzero(&targs, sizeof targs); 2435 targs.ua.fspec = NULL; 2436 targs.ua.export.ex_flags = MNT_DELEXPORT; 2437 if (mount(fsp->f_fstypename, fsp->f_mntonname, 2438 fsp->f_flags | MNT_UPDATE, 2439 (caddr_t)&targs) < 0) 2440 syslog(LOG_ERR, "can't delete exports for %s", 2441 fsp->f_mntonname); 2442 } 2443 } 2444 2445 2446 void 2447 del_mlist(char *hostp, char *dirp) 2448 { 2449 struct mountlist *mlp, **mlpp; 2450 struct mountlist *mlp2; 2451 FILE *mlfile; 2452 int fnd = 0; 2453 2454 mlpp = &mlhead; 2455 mlp = mlhead; 2456 while (mlp) { 2457 if (!strcmp(mlp->ml_host, hostp) && 2458 (!dirp || !strcmp(mlp->ml_dirp, dirp))) { 2459 fnd = 1; 2460 mlp2 = mlp; 2461 *mlpp = mlp = mlp->ml_next; 2462 free((caddr_t)mlp2); 2463 } else { 2464 mlpp = &mlp->ml_next; 2465 mlp = mlp->ml_next; 2466 } 2467 } 2468 if (fnd) { 2469 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) { 2470 syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST); 2471 return; 2472 } 2473 mlp = mlhead; 2474 while (mlp) { 2475 fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp); 2476 mlp = mlp->ml_next; 2477 } 2478 fclose(mlfile); 2479 } 2480 } 2481 2482 void 2483 add_mlist(char *hostp, char *dirp) 2484 { 2485 struct mountlist *mlp, **mlpp; 2486 FILE *mlfile; 2487 2488 mlpp = &mlhead; 2489 mlp = mlhead; 2490 while (mlp) { 2491 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp)) 2492 return; 2493 mlpp = &mlp->ml_next; 2494 mlp = mlp->ml_next; 2495 } 2496 mlp = (struct mountlist *)malloc(sizeof (*mlp)); 2497 if (mlp == NULL) 2498 out_of_mem(); 2499 strncpy(mlp->ml_host, hostp, RPCMNT_NAMELEN); 2500 mlp->ml_host[RPCMNT_NAMELEN] = '\0'; 2501 strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN); 2502 mlp->ml_dirp[RPCMNT_PATHLEN] = '\0'; 2503 mlp->ml_next = NULL; 2504 *mlpp = mlp; 2505 if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) { 2506 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST); 2507 return; 2508 } 2509 fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp); 2510 fclose(mlfile); 2511 } 2512 2513 /* 2514 * Free up a group list. 2515 */ 2516 void 2517 free_grp(struct grouplist *grp) 2518 { 2519 if (grp->gr_type == GT_HOST) { 2520 if (grp->gr_ptr.gt_addrinfo != NULL) 2521 freeaddrinfo(grp->gr_ptr.gt_addrinfo); 2522 } else if (grp->gr_type == GT_NET) { 2523 if (grp->gr_ptr.gt_net.nt_name) 2524 free(grp->gr_ptr.gt_net.nt_name); 2525 } 2526 free((caddr_t)grp); 2527 } 2528 2529 #ifdef DEBUG 2530 void 2531 SYSLOG(int pri, const char *fmt, ...) 2532 { 2533 va_list ap; 2534 2535 va_start(ap, fmt); 2536 vfprintf(stderr, fmt, ap); 2537 va_end(ap); 2538 } 2539 #endif /* DEBUG */ 2540 2541 /* 2542 * Check options for consistency. 2543 */ 2544 int 2545 check_options(struct dirlist *dp) 2546 { 2547 2548 if (dp == NULL) 2549 return (1); 2550 if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL)) { 2551 syslog(LOG_ERR, "-mapall and -maproot mutually exclusive"); 2552 return (1); 2553 } 2554 if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) { 2555 syslog(LOG_ERR, "-mask requires -network"); 2556 return (1); 2557 } 2558 if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) { 2559 syslog(LOG_ERR, "-network requires mask specification"); 2560 return (1); 2561 } 2562 if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) { 2563 syslog(LOG_ERR, "-mask and /masklen are mutually exclusive"); 2564 return (1); 2565 } 2566 if ((opt_flags & OP_ALLDIRS) && dp->dp_left) { 2567 syslog(LOG_ERR, "-alldirs has multiple directories"); 2568 return (1); 2569 } 2570 return (0); 2571 } 2572 2573 /* 2574 * Check an absolute directory path for any symbolic links. Return true 2575 */ 2576 int 2577 check_dirpath(char *dirp) 2578 { 2579 char *cp; 2580 int ret = 1; 2581 struct stat sb; 2582 2583 cp = dirp + 1; 2584 while (*cp && ret) { 2585 if (*cp == '/') { 2586 *cp = '\0'; 2587 if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode)) 2588 ret = 0; 2589 *cp = '/'; 2590 } 2591 cp++; 2592 } 2593 if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode)) 2594 ret = 0; 2595 return (ret); 2596 } 2597 2598 /* 2599 * Make a netmask according to the specified prefix length. The ss_family 2600 * and other non-address fields must be initialised before calling this. 2601 */ 2602 int 2603 makemask(struct sockaddr_storage *ssp, int bitlen) 2604 { 2605 u_char *p; 2606 int bits, i, len; 2607 2608 if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL) 2609 return (-1); 2610 if (bitlen > len * CHAR_BIT) 2611 return (-1); 2612 for (i = 0; i < len; i++) { 2613 bits = (bitlen > CHAR_BIT) ? CHAR_BIT : bitlen; 2614 *p++ = (u_char)~0 << (CHAR_BIT - bits); 2615 bitlen -= bits; 2616 } 2617 return 0; 2618 } 2619 2620 /* 2621 * Check that the sockaddr is a valid netmask. Returns 0 if the mask 2622 * is acceptable (i.e. of the form 1...10....0). 2623 */ 2624 int 2625 checkmask(struct sockaddr *sa) 2626 { 2627 u_char *mask; 2628 int i, len; 2629 2630 if ((mask = sa_rawaddr(sa, &len)) == NULL) 2631 return (-1); 2632 2633 for (i = 0; i < len; i++) 2634 if (mask[i] != 0xff) 2635 break; 2636 if (i < len) { 2637 if (~mask[i] & (u_char)(~mask[i] + 1)) 2638 return (-1); 2639 i++; 2640 } 2641 for (; i < len; i++) 2642 if (mask[i] != 0) 2643 return (-1); 2644 return (0); 2645 } 2646 2647 /* 2648 * Compare two sockaddrs according to a specified mask. Return zero if 2649 * `sa1' matches `sa2' when filtered by the netmask in `samask'. 2650 * If samask is NULL, perform a full comparision. 2651 */ 2652 int 2653 sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask) 2654 { 2655 unsigned char *p1, *p2, *mask; 2656 int len, i; 2657 2658 if (sa1->sa_family != sa2->sa_family || 2659 (p1 = sa_rawaddr(sa1, &len)) == NULL || 2660 (p2 = sa_rawaddr(sa2, NULL)) == NULL) 2661 return (1); 2662 2663 switch (sa1->sa_family) { 2664 case AF_INET6: 2665 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id != 2666 ((struct sockaddr_in6 *)sa2)->sin6_scope_id) 2667 return (1); 2668 break; 2669 } 2670 2671 /* Simple binary comparison if no mask specified. */ 2672 if (samask == NULL) 2673 return (memcmp(p1, p2, len)); 2674 2675 /* Set up the mask, and do a mask-based comparison. */ 2676 if (sa1->sa_family != samask->sa_family || 2677 (mask = sa_rawaddr(samask, NULL)) == NULL) 2678 return (1); 2679 2680 for (i = 0; i < len; i++) 2681 if ((p1[i] & mask[i]) != (p2[i] & mask[i])) 2682 return (1); 2683 return (0); 2684 } 2685 2686 /* 2687 * Return a pointer to the part of the sockaddr that contains the 2688 * raw address, and set *nbytes to its length in bytes. Returns 2689 * NULL if the address family is unknown. 2690 */ 2691 void * 2692 sa_rawaddr(struct sockaddr *sa, int *nbytes) { 2693 void *p; 2694 int len; 2695 2696 switch (sa->sa_family) { 2697 case AF_INET: 2698 len = sizeof(((struct sockaddr_in *)sa)->sin_addr); 2699 p = &((struct sockaddr_in *)sa)->sin_addr; 2700 break; 2701 case AF_INET6: 2702 len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr); 2703 p = &((struct sockaddr_in6 *)sa)->sin6_addr; 2704 break; 2705 default: 2706 p = NULL; 2707 len = 0; 2708 } 2709 2710 if (nbytes != NULL) 2711 *nbytes = len; 2712 return (p); 2713 } 2714 2715 void 2716 huphandler1(int sig __unused) 2717 { 2718 got_sighup1 = 1; 2719 } 2720 2721 void 2722 huphandler2(int sig __unused) 2723 { 2724 got_sighup2 = 1; 2725 } 2726 2727 void terminate(int sig __unused) 2728 { 2729 pidfile_remove(pfh); 2730 rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL); 2731 rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL); 2732 exit (0); 2733 } 2734