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