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 != (SVCXPRT *) 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 (got_nondir) { 1145 syslog(LOG_ERR, "dirs must be first"); 1146 getexp_err(ep, tgrp); 1147 goto nextline; 1148 } 1149 if (ep) { 1150 if (ep->ex_fs.val[0] != fsb.f_fsid.val[0] || 1151 ep->ex_fs.val[1] != fsb.f_fsid.val[1]) { 1152 getexp_err(ep, tgrp); 1153 goto nextline; 1154 } 1155 } else { 1156 /* 1157 * See if this directory is already 1158 * in the list. 1159 */ 1160 ep = ex_search(&fsb.f_fsid); 1161 if (ep == NULL) { 1162 ep = get_exp(); 1163 ep->ex_fs = fsb.f_fsid; 1164 ep->ex_fsdir = (char *) 1165 malloc(strlen(fsb.f_mntonname) + 1); 1166 if (ep->ex_fsdir) 1167 strcpy(ep->ex_fsdir, 1168 fsb.f_mntonname); 1169 else 1170 out_of_mem(); 1171 if (debug) 1172 warnx("making new ep fs=0x%x,0x%x", 1173 fsb.f_fsid.val[0], 1174 fsb.f_fsid.val[1]); 1175 } else if (debug) 1176 warnx("found ep fs=0x%x,0x%x", 1177 fsb.f_fsid.val[0], 1178 fsb.f_fsid.val[1]); 1179 } 1180 1181 /* 1182 * Add dirpath to export mount point. 1183 */ 1184 dirp = add_expdir(&dirhead, cp, len); 1185 dirplen = len; 1186 } else { 1187 getexp_err(ep, tgrp); 1188 goto nextline; 1189 } 1190 *endcp = savedc; 1191 } else { 1192 savedc = *endcp; 1193 *endcp = '\0'; 1194 got_nondir = 1; 1195 if (ep == NULL) { 1196 getexp_err(ep, tgrp); 1197 goto nextline; 1198 } 1199 1200 /* 1201 * Get the host or netgroup. 1202 */ 1203 setnetgrent(cp); 1204 netgrp = getnetgrent(&hst, &usr, &dom); 1205 do { 1206 if (has_host) { 1207 grp->gr_next = get_grp(); 1208 grp = grp->gr_next; 1209 } 1210 if (netgrp) { 1211 if (hst == NULL) { 1212 syslog(LOG_ERR, 1213 "null hostname in netgroup %s, skipping", cp); 1214 grp->gr_type = GT_IGNORE; 1215 } else if (get_host(hst, grp, tgrp)) { 1216 syslog(LOG_ERR, 1217 "bad host %s in netgroup %s, skipping", hst, cp); 1218 grp->gr_type = GT_IGNORE; 1219 } 1220 } else if (get_host(cp, grp, tgrp)) { 1221 syslog(LOG_ERR, "bad host %s, skipping", cp); 1222 grp->gr_type = GT_IGNORE; 1223 } 1224 has_host = TRUE; 1225 } while (netgrp && getnetgrent(&hst, &usr, &dom)); 1226 endnetgrent(); 1227 *endcp = savedc; 1228 } 1229 cp = endcp; 1230 nextfield(&cp, &endcp); 1231 len = endcp - cp; 1232 } 1233 if (check_options(dirhead)) { 1234 getexp_err(ep, tgrp); 1235 goto nextline; 1236 } 1237 if (!has_host) { 1238 grp->gr_type = GT_DEFAULT; 1239 if (debug) 1240 warnx("adding a default entry"); 1241 1242 /* 1243 * Don't allow a network export coincide with a list of 1244 * host(s) on the same line. 1245 */ 1246 } else if ((opt_flags & OP_NET) && tgrp->gr_next) { 1247 syslog(LOG_ERR, "network/host conflict"); 1248 getexp_err(ep, tgrp); 1249 goto nextline; 1250 1251 /* 1252 * If an export list was specified on this line, make sure 1253 * that we have at least one valid entry, otherwise skip it. 1254 */ 1255 } else { 1256 grp = tgrp; 1257 while (grp && grp->gr_type == GT_IGNORE) 1258 grp = grp->gr_next; 1259 if (! grp) { 1260 getexp_err(ep, tgrp); 1261 goto nextline; 1262 } 1263 } 1264 1265 /* 1266 * Loop through hosts, pushing the exports into the kernel. 1267 * After loop, tgrp points to the start of the list and 1268 * grp points to the last entry in the list. 1269 */ 1270 grp = tgrp; 1271 do { 1272 if (do_mount(ep, grp, exflags, &anon, dirp, dirplen, 1273 &fsb)) { 1274 getexp_err(ep, tgrp); 1275 goto nextline; 1276 } 1277 } while (grp->gr_next && (grp = grp->gr_next)); 1278 1279 /* 1280 * Success. Update the data structures. 1281 */ 1282 if (has_host) { 1283 hang_dirp(dirhead, tgrp, ep, opt_flags); 1284 grp->gr_next = grphead; 1285 grphead = tgrp; 1286 } else { 1287 hang_dirp(dirhead, NULL, ep, 1288 opt_flags); 1289 free_grp(grp); 1290 } 1291 dirhead = NULL; 1292 if ((ep->ex_flag & EX_LINKED) == 0) { 1293 ep2 = exphead; 1294 epp = &exphead; 1295 1296 /* 1297 * Insert in the list in alphabetical order. 1298 */ 1299 while (ep2 && strcmp(ep2->ex_fsdir, ep->ex_fsdir) < 0) { 1300 epp = &ep2->ex_next; 1301 ep2 = ep2->ex_next; 1302 } 1303 if (ep2) 1304 ep->ex_next = ep2; 1305 *epp = ep; 1306 ep->ex_flag |= EX_LINKED; 1307 } 1308 nextline: 1309 if (dirhead) { 1310 free_dir(dirhead); 1311 dirhead = NULL; 1312 } 1313 } 1314 fclose(exp_file); 1315 } 1316 1317 /* 1318 * Get the export list from all specified files 1319 */ 1320 void 1321 get_exportlist(void) 1322 { 1323 struct exportlist *ep, *ep2; 1324 struct grouplist *grp, *tgrp; 1325 struct statfs *fsp, *mntbufp; 1326 struct vfsconf vfc; 1327 char *dirp; 1328 int dirplen, num, i; 1329 int done; 1330 1331 dirp = NULL; 1332 dirplen = 0; 1333 1334 /* 1335 * First, get rid of the old list 1336 */ 1337 ep = exphead; 1338 while (ep) { 1339 ep2 = ep; 1340 ep = ep->ex_next; 1341 free_exp(ep2); 1342 } 1343 exphead = NULL; 1344 1345 grp = grphead; 1346 while (grp) { 1347 tgrp = grp; 1348 grp = grp->gr_next; 1349 free_grp(tgrp); 1350 } 1351 grphead = NULL; 1352 1353 /* 1354 * And delete exports that are in the kernel for all local 1355 * filesystems. 1356 * XXX: Should know how to handle all local exportable filesystems. 1357 */ 1358 num = getmntinfo(&mntbufp, MNT_NOWAIT); 1359 for (i = 0; i < num; i++) { 1360 union { 1361 struct ufs_args ua; 1362 struct iso_args ia; 1363 struct mfs_args ma; 1364 struct msdosfs_args da; 1365 struct ntfs_args na; 1366 } targs; 1367 struct export_args export; 1368 1369 fsp = &mntbufp[i]; 1370 if (getvfsbyname(fsp->f_fstypename, &vfc) != 0) { 1371 syslog(LOG_ERR, "getvfsbyname() failed for %s", 1372 fsp->f_fstypename); 1373 continue; 1374 } 1375 1376 /* 1377 * Do not delete export for network filesystem by 1378 * passing "export" arg to mount(). 1379 * It only makes sense to do this for local filesystems. 1380 */ 1381 if (vfc.vfc_flags & VFCF_NETWORK) 1382 continue; 1383 1384 export.ex_flags = MNT_DELEXPORT; 1385 if (mountctl(fsp->f_mntonname, MOUNTCTL_SET_EXPORT, -1, 1386 &export, sizeof(export), NULL, 0) == 0) { 1387 } else if (!strcmp(fsp->f_fstypename, "mfs") || 1388 !strcmp(fsp->f_fstypename, "ufs") || 1389 !strcmp(fsp->f_fstypename, "msdos") || 1390 !strcmp(fsp->f_fstypename, "ntfs") || 1391 !strcmp(fsp->f_fstypename, "cd9660")) { 1392 bzero(&targs, sizeof targs); 1393 targs.ua.fspec = NULL; 1394 targs.ua.export.ex_flags = MNT_DELEXPORT; 1395 if (mount(fsp->f_fstypename, fsp->f_mntonname, 1396 fsp->f_flags | MNT_UPDATE, 1397 (caddr_t)&targs) < 0) 1398 syslog(LOG_ERR, "can't delete exports for %s", 1399 fsp->f_mntonname); 1400 } 1401 } 1402 1403 /* 1404 * Read in the exports file and build the list, calling 1405 * nmount() as we go along to push the export rules into the kernel. 1406 */ 1407 done = 0; 1408 for (i = 0; exnames[i] != NULL; i++) { 1409 if (debug) 1410 warnx("reading exports from %s", exnames[i]); 1411 if ((exp_file = fopen(exnames[i], "r")) == NULL) { 1412 syslog(LOG_WARNING, "can't open %s", exnames[i]); 1413 continue; 1414 } 1415 get_exportlist_one(); 1416 fclose(exp_file); 1417 done++; 1418 } 1419 if (done == 0) { 1420 syslog(LOG_ERR, "can't open any exports file"); 1421 exit(2); 1422 } 1423 } 1424 1425 /* 1426 * Allocate an export list element 1427 */ 1428 struct exportlist * 1429 get_exp(void) 1430 { 1431 struct exportlist *ep; 1432 1433 ep = (struct exportlist *)malloc(sizeof (struct exportlist)); 1434 if (ep == NULL) 1435 out_of_mem(); 1436 memset(ep, 0, sizeof(struct exportlist)); 1437 return (ep); 1438 } 1439 1440 /* 1441 * Allocate a group list element 1442 */ 1443 struct grouplist * 1444 get_grp(void) 1445 { 1446 struct grouplist *gp; 1447 1448 gp = (struct grouplist *)malloc(sizeof (struct grouplist)); 1449 if (gp == NULL) 1450 out_of_mem(); 1451 memset(gp, 0, sizeof(struct grouplist)); 1452 return (gp); 1453 } 1454 1455 /* 1456 * Clean up upon an error in get_exportlist(). 1457 */ 1458 void 1459 getexp_err(struct exportlist *ep, struct grouplist *grp) 1460 { 1461 struct grouplist *tgrp; 1462 1463 if (!(opt_flags & OP_QUIET)) 1464 syslog(LOG_ERR, "bad exports list line %s", line); 1465 if (ep && (ep->ex_flag & EX_LINKED) == 0) 1466 free_exp(ep); 1467 while (grp) { 1468 tgrp = grp; 1469 grp = grp->gr_next; 1470 free_grp(tgrp); 1471 } 1472 } 1473 1474 /* 1475 * Search the export list for a matching fs. 1476 */ 1477 struct exportlist * 1478 ex_search(fsid_t *fsid) 1479 { 1480 struct exportlist *ep; 1481 1482 ep = exphead; 1483 while (ep) { 1484 if (ep->ex_fs.val[0] == fsid->val[0] && 1485 ep->ex_fs.val[1] == fsid->val[1]) 1486 return (ep); 1487 ep = ep->ex_next; 1488 } 1489 return (ep); 1490 } 1491 1492 /* 1493 * Add a directory path to the list. 1494 */ 1495 char * 1496 add_expdir(struct dirlist **dpp, char *cp, int len) 1497 { 1498 struct dirlist *dp; 1499 1500 dp = (struct dirlist *)malloc(sizeof (struct dirlist) + len); 1501 if (dp == NULL) 1502 out_of_mem(); 1503 dp->dp_left = *dpp; 1504 dp->dp_right = NULL; 1505 dp->dp_flag = 0; 1506 dp->dp_hosts = NULL; 1507 strcpy(dp->dp_dirp, cp); 1508 *dpp = dp; 1509 return (dp->dp_dirp); 1510 } 1511 1512 /* 1513 * Hang the dir list element off the dirpath binary tree as required 1514 * and update the entry for host. 1515 */ 1516 void 1517 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep, 1518 int flags) 1519 { 1520 struct hostlist *hp; 1521 struct dirlist *dp2; 1522 1523 if (flags & OP_ALLDIRS) { 1524 if (ep->ex_defdir) 1525 free((caddr_t)dp); 1526 else 1527 ep->ex_defdir = dp; 1528 if (grp == NULL) { 1529 ep->ex_defdir->dp_flag |= DP_DEFSET; 1530 } else while (grp) { 1531 hp = get_ht(); 1532 hp->ht_grp = grp; 1533 hp->ht_next = ep->ex_defdir->dp_hosts; 1534 ep->ex_defdir->dp_hosts = hp; 1535 grp = grp->gr_next; 1536 } 1537 } else { 1538 1539 /* 1540 * Loop through the directories adding them to the tree. 1541 */ 1542 while (dp) { 1543 dp2 = dp->dp_left; 1544 add_dlist(&ep->ex_dirl, dp, grp, flags); 1545 dp = dp2; 1546 } 1547 } 1548 } 1549 1550 /* 1551 * Traverse the binary tree either updating a node that is already there 1552 * for the new directory or adding the new node. 1553 */ 1554 void 1555 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp, 1556 int flags) 1557 { 1558 struct dirlist *dp; 1559 struct hostlist *hp; 1560 int cmp; 1561 1562 dp = *dpp; 1563 if (dp) { 1564 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp); 1565 if (cmp > 0) { 1566 add_dlist(&dp->dp_left, newdp, grp, flags); 1567 return; 1568 } else if (cmp < 0) { 1569 add_dlist(&dp->dp_right, newdp, grp, flags); 1570 return; 1571 } else 1572 free((caddr_t)newdp); 1573 } else { 1574 dp = newdp; 1575 dp->dp_left = NULL; 1576 *dpp = dp; 1577 } 1578 if (grp) { 1579 1580 /* 1581 * Hang all of the host(s) off of the directory point. 1582 */ 1583 do { 1584 hp = get_ht(); 1585 hp->ht_grp = grp; 1586 hp->ht_next = dp->dp_hosts; 1587 dp->dp_hosts = hp; 1588 grp = grp->gr_next; 1589 } while (grp); 1590 } else { 1591 dp->dp_flag |= DP_DEFSET; 1592 } 1593 } 1594 1595 /* 1596 * Search for a dirpath on the export point. 1597 */ 1598 struct dirlist * 1599 dirp_search(struct dirlist *dp, char *dirp) 1600 { 1601 int cmp; 1602 1603 if (dp) { 1604 cmp = strcmp(dp->dp_dirp, dirp); 1605 if (cmp > 0) 1606 return (dirp_search(dp->dp_left, dirp)); 1607 else if (cmp < 0) 1608 return (dirp_search(dp->dp_right, dirp)); 1609 else 1610 return (dp); 1611 } 1612 return (dp); 1613 } 1614 1615 /* 1616 * Scan for a host match in a directory tree. 1617 */ 1618 int 1619 chk_host(struct dirlist *dp, struct sockaddr *saddr, int *defsetp, 1620 int *hostsetp) 1621 { 1622 struct hostlist *hp; 1623 struct grouplist *grp; 1624 struct addrinfo *ai; 1625 1626 if (dp) { 1627 if (dp->dp_flag & DP_DEFSET) 1628 *defsetp = dp->dp_flag; 1629 hp = dp->dp_hosts; 1630 while (hp) { 1631 grp = hp->ht_grp; 1632 switch (grp->gr_type) { 1633 case GT_HOST: 1634 ai = grp->gr_ptr.gt_addrinfo; 1635 for (; ai; ai = ai->ai_next) { 1636 if (!sacmp(ai->ai_addr, saddr, NULL)) { 1637 *hostsetp = 1638 (hp->ht_flag | DP_HOSTSET); 1639 return (1); 1640 } 1641 } 1642 break; 1643 case GT_NET: 1644 if (!sacmp(saddr, (struct sockaddr *) 1645 &grp->gr_ptr.gt_net.nt_net, 1646 (struct sockaddr *) 1647 &grp->gr_ptr.gt_net.nt_mask)) { 1648 *hostsetp = (hp->ht_flag | DP_HOSTSET); 1649 return (1); 1650 } 1651 break; 1652 } 1653 hp = hp->ht_next; 1654 } 1655 } 1656 return (0); 1657 } 1658 1659 /* 1660 * Scan tree for a host that matches the address. 1661 */ 1662 int 1663 scan_tree(struct dirlist *dp, struct sockaddr *saddr) 1664 { 1665 int defset, hostset; 1666 1667 if (dp) { 1668 if (scan_tree(dp->dp_left, saddr)) 1669 return (1); 1670 if (chk_host(dp, saddr, &defset, &hostset)) 1671 return (1); 1672 if (scan_tree(dp->dp_right, saddr)) 1673 return (1); 1674 } 1675 return (0); 1676 } 1677 1678 /* 1679 * Traverse the dirlist tree and free it up. 1680 */ 1681 void 1682 free_dir(struct dirlist *dp) 1683 { 1684 1685 if (dp) { 1686 free_dir(dp->dp_left); 1687 free_dir(dp->dp_right); 1688 free_host(dp->dp_hosts); 1689 free((caddr_t)dp); 1690 } 1691 } 1692 1693 /* 1694 * Parse the option string and update fields. 1695 * Option arguments may either be -<option>=<value> or 1696 * -<option> <value> 1697 */ 1698 int 1699 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp, 1700 int *has_hostp, int *exflagsp, struct ucred *cr) 1701 { 1702 char *cpoptarg, *cpoptend; 1703 char *cp, *endcp, *cpopt, savedc, savedc2; 1704 int allflag, usedarg; 1705 1706 savedc2 = '\0'; 1707 cpopt = *cpp; 1708 cpopt++; 1709 cp = *endcpp; 1710 savedc = *cp; 1711 *cp = '\0'; 1712 while (cpopt && *cpopt) { 1713 allflag = 1; 1714 usedarg = -2; 1715 if ((cpoptend = strchr(cpopt, ','))) { 1716 *cpoptend++ = '\0'; 1717 if ((cpoptarg = strchr(cpopt, '='))) 1718 *cpoptarg++ = '\0'; 1719 } else { 1720 if ((cpoptarg = strchr(cpopt, '='))) 1721 *cpoptarg++ = '\0'; 1722 else { 1723 *cp = savedc; 1724 nextfield(&cp, &endcp); 1725 **endcpp = '\0'; 1726 if (endcp > cp && *cp != '-') { 1727 cpoptarg = cp; 1728 savedc2 = *endcp; 1729 *endcp = '\0'; 1730 usedarg = 0; 1731 } 1732 } 1733 } 1734 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) { 1735 *exflagsp |= MNT_EXRDONLY; 1736 } else if (cpoptarg && (!strcmp(cpopt, "maproot") || 1737 !(allflag = strcmp(cpopt, "mapall")) || 1738 !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) { 1739 usedarg++; 1740 parsecred(cpoptarg, cr); 1741 if (allflag == 0) { 1742 *exflagsp |= MNT_EXPORTANON; 1743 opt_flags |= OP_MAPALL; 1744 } else 1745 opt_flags |= OP_MAPROOT; 1746 } else if (cpoptarg && (!strcmp(cpopt, "mask") || 1747 !strcmp(cpopt, "m"))) { 1748 if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) { 1749 syslog(LOG_ERR, "bad mask: %s", cpoptarg); 1750 return (1); 1751 } 1752 usedarg++; 1753 opt_flags |= OP_MASK; 1754 } else if (cpoptarg && (!strcmp(cpopt, "network") || 1755 !strcmp(cpopt, "n"))) { 1756 if (strchr(cpoptarg, '/') != NULL) { 1757 if (debug) 1758 fprintf(stderr, "setting OP_MASKLEN\n"); 1759 opt_flags |= OP_MASKLEN; 1760 } 1761 if (grp->gr_type != GT_NULL) { 1762 syslog(LOG_ERR, "network/host conflict"); 1763 return (1); 1764 } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) { 1765 syslog(LOG_ERR, "bad net: %s", cpoptarg); 1766 return (1); 1767 } 1768 grp->gr_type = GT_NET; 1769 *has_hostp = 1; 1770 usedarg++; 1771 opt_flags |= OP_NET; 1772 } else if (!strcmp(cpopt, "alldirs")) { 1773 opt_flags |= OP_ALLDIRS; 1774 } else if (!strcmp(cpopt, "public")) { 1775 *exflagsp |= MNT_EXPUBLIC; 1776 } else if (!strcmp(cpopt, "webnfs")) { 1777 *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON); 1778 opt_flags |= OP_MAPALL; 1779 } else if (cpoptarg && !strcmp(cpopt, "index")) { 1780 ep->ex_indexfile = strdup(cpoptarg); 1781 } else if (!strcmp(cpopt, "quiet")) { 1782 opt_flags |= OP_QUIET; 1783 } else { 1784 syslog(LOG_ERR, "bad opt %s", cpopt); 1785 return (1); 1786 } 1787 if (usedarg >= 0) { 1788 *endcp = savedc2; 1789 **endcpp = savedc; 1790 if (usedarg > 0) { 1791 *cpp = cp; 1792 *endcpp = endcp; 1793 } 1794 return (0); 1795 } 1796 cpopt = cpoptend; 1797 } 1798 **endcpp = savedc; 1799 return (0); 1800 } 1801 1802 /* 1803 * Translate a character string to the corresponding list of network 1804 * addresses for a hostname. 1805 */ 1806 int 1807 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp) 1808 { 1809 struct grouplist *checkgrp; 1810 struct addrinfo *ai, *tai, hints; 1811 int ecode; 1812 char host[NI_MAXHOST]; 1813 1814 if (grp->gr_type != GT_NULL) { 1815 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp); 1816 return (1); 1817 } 1818 memset(&hints, 0, sizeof hints); 1819 hints.ai_flags = AI_CANONNAME; 1820 hints.ai_protocol = IPPROTO_UDP; 1821 ecode = getaddrinfo(cp, NULL, &hints, &ai); 1822 if (ecode != 0) { 1823 syslog(LOG_ERR,"can't get address info for host %s", cp); 1824 return 1; 1825 } 1826 grp->gr_ptr.gt_addrinfo = ai; 1827 while (ai != NULL) { 1828 if (ai->ai_canonname == NULL) { 1829 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host, 1830 sizeof host, NULL, 0, NI_NUMERICHOST) != 0) 1831 strlcpy(host, "?", sizeof(host)); 1832 ai->ai_canonname = strdup(host); 1833 ai->ai_flags |= AI_CANONNAME; 1834 } 1835 if (debug) 1836 fprintf(stderr, "got host %s\n", ai->ai_canonname); 1837 /* 1838 * Sanity check: make sure we don't already have an entry 1839 * for this host in the grouplist. 1840 */ 1841 for (checkgrp = tgrp; checkgrp != NULL; 1842 checkgrp = checkgrp->gr_next) { 1843 if (checkgrp->gr_type != GT_HOST) 1844 continue; 1845 for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL; 1846 tai = tai->ai_next) { 1847 if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0) 1848 continue; 1849 if (debug) 1850 fprintf(stderr, 1851 "ignoring duplicate host %s\n", 1852 ai->ai_canonname); 1853 grp->gr_type = GT_IGNORE; 1854 return (0); 1855 } 1856 } 1857 ai = ai->ai_next; 1858 } 1859 grp->gr_type = GT_HOST; 1860 return (0); 1861 } 1862 1863 /* 1864 * Free up an exports list component 1865 */ 1866 void 1867 free_exp(struct exportlist *ep) 1868 { 1869 1870 if (ep->ex_defdir) { 1871 free_host(ep->ex_defdir->dp_hosts); 1872 free((caddr_t)ep->ex_defdir); 1873 } 1874 if (ep->ex_fsdir) 1875 free(ep->ex_fsdir); 1876 if (ep->ex_indexfile) 1877 free(ep->ex_indexfile); 1878 free_dir(ep->ex_dirl); 1879 free((caddr_t)ep); 1880 } 1881 1882 /* 1883 * Free hosts. 1884 */ 1885 void 1886 free_host(struct hostlist *hp) 1887 { 1888 struct hostlist *hp2; 1889 1890 while (hp) { 1891 hp2 = hp; 1892 hp = hp->ht_next; 1893 free((caddr_t)hp2); 1894 } 1895 } 1896 1897 struct hostlist * 1898 get_ht(void) 1899 { 1900 struct hostlist *hp; 1901 1902 hp = (struct hostlist *)malloc(sizeof (struct hostlist)); 1903 if (hp == NULL) 1904 out_of_mem(); 1905 hp->ht_next = NULL; 1906 hp->ht_flag = 0; 1907 return (hp); 1908 } 1909 1910 /* 1911 * Out of memory, fatal 1912 */ 1913 void 1914 out_of_mem(void) 1915 { 1916 1917 syslog(LOG_ERR, "out of memory"); 1918 exit(2); 1919 } 1920 1921 /* 1922 * Do the mount syscall with the update flag to push the export info into 1923 * the kernel. 1924 */ 1925 int 1926 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags, 1927 struct ucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb) 1928 { 1929 struct statfs fsb1; 1930 struct addrinfo *ai; 1931 struct export_args *eap; 1932 char *cp = NULL; 1933 int done; 1934 char savedc = '\0'; 1935 union { 1936 struct ufs_args ua; 1937 struct iso_args ia; 1938 struct mfs_args ma; 1939 struct msdosfs_args da; 1940 struct ntfs_args na; 1941 } args; 1942 1943 bzero(&args, sizeof args); 1944 /* XXX, we assume that all xx_args look like ufs_args. */ 1945 args.ua.fspec = 0; 1946 eap = &args.ua.export; 1947 1948 eap->ex_flags = exflags; 1949 eap->ex_anon = *anoncrp; 1950 eap->ex_indexfile = ep->ex_indexfile; 1951 if (grp->gr_type == GT_HOST) 1952 ai = grp->gr_ptr.gt_addrinfo; 1953 else 1954 ai = NULL; 1955 done = FALSE; 1956 while (!done) { 1957 switch (grp->gr_type) { 1958 case GT_HOST: 1959 if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0) 1960 goto skip; 1961 eap->ex_addr = ai->ai_addr; 1962 eap->ex_addrlen = ai->ai_addrlen; 1963 eap->ex_masklen = 0; 1964 break; 1965 case GT_NET: 1966 if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 && 1967 have_v6 == 0) 1968 goto skip; 1969 eap->ex_addr = 1970 (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net; 1971 eap->ex_addrlen = args.ua.export.ex_addr->sa_len; 1972 eap->ex_mask = 1973 (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask; 1974 eap->ex_masklen = args.ua.export.ex_mask->sa_len; 1975 break; 1976 case GT_DEFAULT: 1977 eap->ex_addr = NULL; 1978 eap->ex_addrlen = 0; 1979 eap->ex_mask = NULL; 1980 eap->ex_masklen = 0; 1981 break; 1982 case GT_IGNORE: 1983 return(0); 1984 break; 1985 default: 1986 syslog(LOG_ERR, "bad grouptype"); 1987 if (cp) 1988 *cp = savedc; 1989 return (1); 1990 } 1991 1992 /* 1993 * XXX: 1994 * Maybe I should just use the fsb->f_mntonname path instead 1995 * of looping back up the dirp to the mount point?? 1996 * Also, needs to know how to export all types of local 1997 * exportable filesystems and not just "ufs". 1998 */ 1999 for (;;) { 2000 int r; 2001 2002 r = mountctl(fsb->f_mntonname, MOUNTCTL_SET_EXPORT, 2003 -1, 2004 &args.ua.export, sizeof(args.ua.export), 2005 NULL, 0); 2006 if (r < 0 && errno == EOPNOTSUPP) { 2007 r = mount(fsb->f_fstypename, dirp, 2008 fsb->f_flags | MNT_UPDATE, 2009 (caddr_t)&args); 2010 } 2011 if (r >= 0) 2012 break; 2013 if (cp) 2014 *cp-- = savedc; 2015 else 2016 cp = dirp + dirplen - 1; 2017 if (opt_flags & OP_QUIET) 2018 return (1); 2019 if (errno == EPERM) { 2020 if (debug) 2021 warnx("can't change attributes for %s", 2022 dirp); 2023 syslog(LOG_ERR, 2024 "can't change attributes for %s", dirp); 2025 return (1); 2026 } 2027 if (opt_flags & OP_ALLDIRS) { 2028 if (errno == EINVAL) 2029 syslog(LOG_ERR, 2030 "-alldirs requested but %s is not a filesystem mountpoint", 2031 dirp); 2032 else 2033 syslog(LOG_ERR, 2034 "could not remount %s: %m", 2035 dirp); 2036 return (1); 2037 } 2038 /* back up over the last component */ 2039 while (*cp == '/' && cp > dirp) 2040 cp--; 2041 while (*(cp - 1) != '/' && cp > dirp) 2042 cp--; 2043 if (cp == dirp) { 2044 if (debug) 2045 warnx("mnt unsucc"); 2046 syslog(LOG_ERR, "can't export %s", dirp); 2047 return (1); 2048 } 2049 savedc = *cp; 2050 *cp = '\0'; 2051 /* Check that we're still on the same filesystem. */ 2052 if (statfs(dirp, &fsb1) != 0 || bcmp(&fsb1.f_fsid, 2053 &fsb->f_fsid, sizeof(fsb1.f_fsid)) != 0) { 2054 *cp = savedc; 2055 syslog(LOG_ERR, "can't export %s", dirp); 2056 return (1); 2057 } 2058 } 2059 skip: 2060 if (ai != NULL) 2061 ai = ai->ai_next; 2062 if (ai == NULL) 2063 done = TRUE; 2064 } 2065 if (cp) 2066 *cp = savedc; 2067 return (0); 2068 } 2069 2070 /* 2071 * Translate a net address. 2072 * 2073 * If `maskflg' is nonzero, then `cp' is a netmask, not a network address. 2074 */ 2075 int 2076 get_net(char *cp, struct netmsk *net, int maskflg) 2077 { 2078 struct netent *np = NULL; 2079 char *name, *p, *prefp; 2080 struct sockaddr_in sin; 2081 struct sockaddr *sa = NULL; 2082 struct addrinfo hints, *ai = NULL; 2083 char netname[NI_MAXHOST]; 2084 long preflen; 2085 2086 p = prefp = NULL; 2087 if ((opt_flags & OP_MASKLEN) && !maskflg) { 2088 p = strchr(cp, '/'); 2089 *p = '\0'; 2090 prefp = p + 1; 2091 } 2092 2093 /* 2094 * Check for a numeric address first. We wish to avoid 2095 * possible DNS lookups in getnetbyname(). 2096 */ 2097 if (isxdigit(*cp) || *cp == ':') { 2098 memset(&hints, 0, sizeof hints); 2099 /* Ensure the mask and the network have the same family. */ 2100 if (maskflg && (opt_flags & OP_NET)) 2101 hints.ai_family = net->nt_net.ss_family; 2102 else if (!maskflg && (opt_flags & OP_HAVEMASK)) 2103 hints.ai_family = net->nt_mask.ss_family; 2104 else 2105 hints.ai_family = AF_UNSPEC; 2106 hints.ai_flags = AI_NUMERICHOST; 2107 if (getaddrinfo(cp, NULL, &hints, &ai) == 0) 2108 sa = ai->ai_addr; 2109 if (sa != NULL && ai->ai_family == AF_INET) { 2110 /* 2111 * The address in `cp' is really a network address, so 2112 * use inet_network() to re-interpret this correctly. 2113 * e.g. "127.1" means 127.1.0.0, not 127.0.0.1. 2114 */ 2115 bzero(&sin, sizeof sin); 2116 sin.sin_family = AF_INET; 2117 sin.sin_len = sizeof sin; 2118 sin.sin_addr = inet_makeaddr(inet_network(cp), 0); 2119 if (debug) 2120 fprintf(stderr, "get_net: v4 addr %s\n", 2121 inet_ntoa(sin.sin_addr)); 2122 sa = (struct sockaddr *)&sin; 2123 } 2124 } 2125 if (sa == NULL && (np = getnetbyname(cp)) != NULL) { 2126 bzero(&sin, sizeof sin); 2127 sin.sin_family = AF_INET; 2128 sin.sin_len = sizeof sin; 2129 sin.sin_addr = inet_makeaddr(np->n_net, 0); 2130 sa = (struct sockaddr *)&sin; 2131 } 2132 if (sa == NULL) 2133 goto fail; 2134 2135 if (maskflg) { 2136 /* The specified sockaddr is a mask. */ 2137 if (checkmask(sa) != 0) 2138 goto fail; 2139 bcopy(sa, &net->nt_mask, sa->sa_len); 2140 opt_flags |= OP_HAVEMASK; 2141 } else { 2142 /* The specified sockaddr is a network address. */ 2143 bcopy(sa, &net->nt_net, sa->sa_len); 2144 2145 /* Get a network name for the export list. */ 2146 if (np) { 2147 name = np->n_name; 2148 } else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname, 2149 NULL, 0, NI_NUMERICHOST) == 0) { 2150 name = netname; 2151 } else { 2152 goto fail; 2153 } 2154 if ((net->nt_name = strdup(name)) == NULL) 2155 out_of_mem(); 2156 2157 /* 2158 * Extract a mask from either a "/<masklen>" suffix, or 2159 * from the class of an IPv4 address. 2160 */ 2161 if (opt_flags & OP_MASKLEN) { 2162 preflen = strtol(prefp, NULL, 10); 2163 if (preflen < 0L || preflen == LONG_MAX) 2164 goto fail; 2165 bcopy(sa, &net->nt_mask, sa->sa_len); 2166 if (makemask(&net->nt_mask, (int)preflen) != 0) 2167 goto fail; 2168 opt_flags |= OP_HAVEMASK; 2169 *p = '/'; 2170 } else if (sa->sa_family == AF_INET && 2171 (opt_flags & OP_MASK) == 0) { 2172 in_addr_t addr; 2173 2174 addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr; 2175 if (IN_CLASSA(addr)) 2176 preflen = 8; 2177 else if (IN_CLASSB(addr)) 2178 preflen = 16; 2179 else if (IN_CLASSC(addr)) 2180 preflen = 24; 2181 else if (IN_CLASSD(addr)) 2182 preflen = 28; 2183 else 2184 preflen = 32; /* XXX */ 2185 2186 bcopy(sa, &net->nt_mask, sa->sa_len); 2187 makemask(&net->nt_mask, (int)preflen); 2188 opt_flags |= OP_HAVEMASK; 2189 } 2190 } 2191 2192 if (ai) 2193 freeaddrinfo(ai); 2194 return 0; 2195 2196 fail: 2197 if (ai) 2198 freeaddrinfo(ai); 2199 return 1; 2200 } 2201 2202 /* 2203 * Parse out the next white space separated field 2204 */ 2205 void 2206 nextfield(char **cp, char **endcp) 2207 { 2208 char *p; 2209 2210 p = *cp; 2211 while (*p == ' ' || *p == '\t') 2212 p++; 2213 if (*p == '\n' || *p == '\0') 2214 *cp = *endcp = p; 2215 else { 2216 *cp = p++; 2217 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0') 2218 p++; 2219 *endcp = p; 2220 } 2221 } 2222 2223 /* 2224 * Get an exports file line. Skip over blank lines and handle line 2225 * continuations. 2226 */ 2227 int 2228 get_line(void) 2229 { 2230 char *p, *cp; 2231 size_t len; 2232 int totlen, cont_line; 2233 2234 /* 2235 * Loop around ignoring blank lines and getting all continuation lines. 2236 */ 2237 p = line; 2238 totlen = 0; 2239 do { 2240 if ((p = fgetln(exp_file, &len)) == NULL) 2241 return (0); 2242 cp = p + len - 1; 2243 cont_line = 0; 2244 while (cp >= p && 2245 (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) { 2246 if (*cp == '\\') 2247 cont_line = 1; 2248 cp--; 2249 len--; 2250 } 2251 if (cont_line) { 2252 *++cp = ' '; 2253 len++; 2254 } 2255 if (linesize < len + totlen + 1) { 2256 linesize = len + totlen + 1; 2257 line = realloc(line, linesize); 2258 if (line == NULL) 2259 out_of_mem(); 2260 } 2261 memcpy(line + totlen, p, len); 2262 totlen += len; 2263 line[totlen] = '\0'; 2264 } while (totlen == 0 || cont_line); 2265 return (1); 2266 } 2267 2268 /* 2269 * Parse a description of a credential. 2270 */ 2271 void 2272 parsecred(char *namelist, struct ucred *cr) 2273 { 2274 char *name; 2275 int cnt; 2276 char *names; 2277 struct passwd *pw; 2278 struct group *gr; 2279 gid_t ngroups, groups[NGROUPS + 1]; 2280 2281 /* 2282 * Set up the unprivileged user. 2283 */ 2284 cr->cr_ref = 1; 2285 cr->cr_uid = -2; 2286 cr->cr_groups[0] = -2; 2287 cr->cr_ngroups = 1; 2288 /* 2289 * Get the user's password table entry. 2290 */ 2291 names = strsep(&namelist, " \t\n"); 2292 name = strsep(&names, ":"); 2293 if (isdigit(*name) || *name == '-') 2294 pw = getpwuid(atoi(name)); 2295 else 2296 pw = getpwnam(name); 2297 /* 2298 * Credentials specified as those of a user. 2299 */ 2300 if (names == NULL) { 2301 if (pw == NULL) { 2302 syslog(LOG_ERR, "unknown user: %s", name); 2303 return; 2304 } 2305 cr->cr_uid = pw->pw_uid; 2306 ngroups = NGROUPS + 1; 2307 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups)) 2308 syslog(LOG_ERR, "too many groups"); 2309 /* 2310 * Compress out duplicate 2311 */ 2312 cr->cr_ngroups = ngroups - 1; 2313 cr->cr_groups[0] = groups[0]; 2314 for (cnt = 2; cnt < ngroups; cnt++) 2315 cr->cr_groups[cnt - 1] = groups[cnt]; 2316 return; 2317 } 2318 /* 2319 * Explicit credential specified as a colon separated list: 2320 * uid:gid:gid:... 2321 */ 2322 if (pw != NULL) 2323 cr->cr_uid = pw->pw_uid; 2324 else if (isdigit(*name) || *name == '-') 2325 cr->cr_uid = atoi(name); 2326 else { 2327 syslog(LOG_ERR, "unknown user: %s", name); 2328 return; 2329 } 2330 cr->cr_ngroups = 0; 2331 while (names != NULL && *names != '\0' && cr->cr_ngroups < NGROUPS) { 2332 name = strsep(&names, ":"); 2333 if (isdigit(*name) || *name == '-') { 2334 cr->cr_groups[cr->cr_ngroups++] = atoi(name); 2335 } else { 2336 if ((gr = getgrnam(name)) == NULL) { 2337 syslog(LOG_ERR, "unknown group: %s", name); 2338 continue; 2339 } 2340 cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid; 2341 } 2342 } 2343 if (names != NULL && *names != '\0' && cr->cr_ngroups == NGROUPS) 2344 syslog(LOG_ERR, "too many groups"); 2345 } 2346 2347 #define STRSIZ (RPCMNT_NAMELEN+RPCMNT_PATHLEN+50) 2348 /* 2349 * Routines that maintain the remote mounttab 2350 */ 2351 void 2352 get_mountlist(void) 2353 { 2354 struct mountlist *mlp, **mlpp; 2355 char *host, *dirp, *cp; 2356 char str[STRSIZ]; 2357 FILE *mlfile; 2358 2359 if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) { 2360 if (errno == ENOENT) 2361 return; 2362 else { 2363 syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST); 2364 return; 2365 } 2366 } 2367 mlpp = &mlhead; 2368 while (fgets(str, STRSIZ, mlfile) != NULL) { 2369 cp = str; 2370 host = strsep(&cp, " \t\n"); 2371 dirp = strsep(&cp, " \t\n"); 2372 if (host == NULL || dirp == NULL) 2373 continue; 2374 mlp = (struct mountlist *)malloc(sizeof (*mlp)); 2375 if (mlp == NULL) 2376 out_of_mem(); 2377 strncpy(mlp->ml_host, host, RPCMNT_NAMELEN); 2378 mlp->ml_host[RPCMNT_NAMELEN] = '\0'; 2379 strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN); 2380 mlp->ml_dirp[RPCMNT_PATHLEN] = '\0'; 2381 mlp->ml_next = NULL; 2382 *mlpp = mlp; 2383 mlpp = &mlp->ml_next; 2384 } 2385 fclose(mlfile); 2386 } 2387 2388 void 2389 del_mlist(char *hostp, char *dirp) 2390 { 2391 struct mountlist *mlp, **mlpp; 2392 struct mountlist *mlp2; 2393 FILE *mlfile; 2394 int fnd = 0; 2395 2396 mlpp = &mlhead; 2397 mlp = mlhead; 2398 while (mlp) { 2399 if (!strcmp(mlp->ml_host, hostp) && 2400 (!dirp || !strcmp(mlp->ml_dirp, dirp))) { 2401 fnd = 1; 2402 mlp2 = mlp; 2403 *mlpp = mlp = mlp->ml_next; 2404 free((caddr_t)mlp2); 2405 } else { 2406 mlpp = &mlp->ml_next; 2407 mlp = mlp->ml_next; 2408 } 2409 } 2410 if (fnd) { 2411 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) { 2412 syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST); 2413 return; 2414 } 2415 mlp = mlhead; 2416 while (mlp) { 2417 fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp); 2418 mlp = mlp->ml_next; 2419 } 2420 fclose(mlfile); 2421 } 2422 } 2423 2424 void 2425 add_mlist(char *hostp, char *dirp) 2426 { 2427 struct mountlist *mlp, **mlpp; 2428 FILE *mlfile; 2429 2430 mlpp = &mlhead; 2431 mlp = mlhead; 2432 while (mlp) { 2433 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp)) 2434 return; 2435 mlpp = &mlp->ml_next; 2436 mlp = mlp->ml_next; 2437 } 2438 mlp = (struct mountlist *)malloc(sizeof (*mlp)); 2439 if (mlp == NULL) 2440 out_of_mem(); 2441 strncpy(mlp->ml_host, hostp, RPCMNT_NAMELEN); 2442 mlp->ml_host[RPCMNT_NAMELEN] = '\0'; 2443 strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN); 2444 mlp->ml_dirp[RPCMNT_PATHLEN] = '\0'; 2445 mlp->ml_next = NULL; 2446 *mlpp = mlp; 2447 if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) { 2448 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST); 2449 return; 2450 } 2451 fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp); 2452 fclose(mlfile); 2453 } 2454 2455 /* 2456 * Free up a group list. 2457 */ 2458 void 2459 free_grp(struct grouplist *grp) 2460 { 2461 if (grp->gr_type == GT_HOST) { 2462 if (grp->gr_ptr.gt_addrinfo != NULL) 2463 freeaddrinfo(grp->gr_ptr.gt_addrinfo); 2464 } else if (grp->gr_type == GT_NET) { 2465 if (grp->gr_ptr.gt_net.nt_name) 2466 free(grp->gr_ptr.gt_net.nt_name); 2467 } 2468 free((caddr_t)grp); 2469 } 2470 2471 #ifdef DEBUG 2472 void 2473 SYSLOG(int pri, const char *fmt, ...) 2474 { 2475 va_list ap; 2476 2477 va_start(ap, fmt); 2478 vfprintf(stderr, fmt, ap); 2479 va_end(ap); 2480 } 2481 #endif /* DEBUG */ 2482 2483 /* 2484 * Check options for consistency. 2485 */ 2486 int 2487 check_options(struct dirlist *dp) 2488 { 2489 2490 if (dp == NULL) 2491 return (1); 2492 if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL)) { 2493 syslog(LOG_ERR, "-mapall and -maproot mutually exclusive"); 2494 return (1); 2495 } 2496 if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) { 2497 syslog(LOG_ERR, "-mask requires -network"); 2498 return (1); 2499 } 2500 if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) { 2501 syslog(LOG_ERR, "-network requires mask specification"); 2502 return (1); 2503 } 2504 if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) { 2505 syslog(LOG_ERR, "-mask and /masklen are mutually exclusive"); 2506 return (1); 2507 } 2508 if ((opt_flags & OP_ALLDIRS) && dp->dp_left) { 2509 syslog(LOG_ERR, "-alldirs has multiple directories"); 2510 return (1); 2511 } 2512 return (0); 2513 } 2514 2515 /* 2516 * Check an absolute directory path for any symbolic links. Return true 2517 */ 2518 int 2519 check_dirpath(char *dirp) 2520 { 2521 char *cp; 2522 int ret = 1; 2523 struct stat sb; 2524 2525 cp = dirp + 1; 2526 while (*cp && ret) { 2527 if (*cp == '/') { 2528 *cp = '\0'; 2529 if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode)) 2530 ret = 0; 2531 *cp = '/'; 2532 } 2533 cp++; 2534 } 2535 if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode)) 2536 ret = 0; 2537 return (ret); 2538 } 2539 2540 /* 2541 * Make a netmask according to the specified prefix length. The ss_family 2542 * and other non-address fields must be initialised before calling this. 2543 */ 2544 int 2545 makemask(struct sockaddr_storage *ssp, int bitlen) 2546 { 2547 u_char *p; 2548 int bits, i, len; 2549 2550 if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL) 2551 return (-1); 2552 if (bitlen > len * CHAR_BIT) 2553 return (-1); 2554 for (i = 0; i < len; i++) { 2555 bits = (bitlen > CHAR_BIT) ? CHAR_BIT : bitlen; 2556 *p++ = (1 << bits) - 1; 2557 bitlen -= bits; 2558 } 2559 return 0; 2560 } 2561 2562 /* 2563 * Check that the sockaddr is a valid netmask. Returns 0 if the mask 2564 * is acceptable (i.e. of the form 1...10....0). 2565 */ 2566 int 2567 checkmask(struct sockaddr *sa) 2568 { 2569 u_char *mask; 2570 int i, len; 2571 2572 if ((mask = sa_rawaddr(sa, &len)) == NULL) 2573 return (-1); 2574 2575 for (i = 0; i < len; i++) 2576 if (mask[i] != 0xff) 2577 break; 2578 if (i < len) { 2579 if (~mask[i] & (u_char)(~mask[i] + 1)) 2580 return (-1); 2581 i++; 2582 } 2583 for (; i < len; i++) 2584 if (mask[i] != 0) 2585 return (-1); 2586 return (0); 2587 } 2588 2589 /* 2590 * Compare two sockaddrs according to a specified mask. Return zero if 2591 * `sa1' matches `sa2' when filtered by the netmask in `samask'. 2592 * If samask is NULL, perform a full comparision. 2593 */ 2594 int 2595 sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask) 2596 { 2597 unsigned char *p1, *p2, *mask; 2598 int len, i; 2599 2600 if (sa1->sa_family != sa2->sa_family || 2601 (p1 = sa_rawaddr(sa1, &len)) == NULL || 2602 (p2 = sa_rawaddr(sa2, NULL)) == NULL) 2603 return (1); 2604 2605 switch (sa1->sa_family) { 2606 case AF_INET6: 2607 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id != 2608 ((struct sockaddr_in6 *)sa2)->sin6_scope_id) 2609 return (1); 2610 break; 2611 } 2612 2613 /* Simple binary comparison if no mask specified. */ 2614 if (samask == NULL) 2615 return (memcmp(p1, p2, len)); 2616 2617 /* Set up the mask, and do a mask-based comparison. */ 2618 if (sa1->sa_family != samask->sa_family || 2619 (mask = sa_rawaddr(samask, NULL)) == NULL) 2620 return (1); 2621 2622 for (i = 0; i < len; i++) 2623 if ((p1[i] & mask[i]) != (p2[i] & mask[i])) 2624 return (1); 2625 return (0); 2626 } 2627 2628 /* 2629 * Return a pointer to the part of the sockaddr that contains the 2630 * raw address, and set *nbytes to its length in bytes. Returns 2631 * NULL if the address family is unknown. 2632 */ 2633 void * 2634 sa_rawaddr(struct sockaddr *sa, int *nbytes) { 2635 void *p; 2636 int len; 2637 2638 switch (sa->sa_family) { 2639 case AF_INET: 2640 len = sizeof(((struct sockaddr_in *)sa)->sin_addr); 2641 p = &((struct sockaddr_in *)sa)->sin_addr; 2642 break; 2643 case AF_INET6: 2644 len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr); 2645 p = &((struct sockaddr_in6 *)sa)->sin6_addr; 2646 break; 2647 default: 2648 p = NULL; 2649 len = 0; 2650 } 2651 2652 if (nbytes != NULL) 2653 *nbytes = len; 2654 return (p); 2655 } 2656 2657 void 2658 huphandler(int sig) 2659 { 2660 got_sighup = 1; 2661 } 2662 2663 void terminate(int sig) 2664 { 2665 pidfile_remove(pfh); 2666 rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL); 2667 rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL); 2668 exit (0); 2669 } 2670