mountd.c revision 91354
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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37#ifndef lint 38static const char copyright[] = 39"@(#) Copyright (c) 1989, 1993\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41#endif /*not lint*/ 42 43#ifndef lint 44#if 0 45static char sccsid[] = "@(#)mountd.c 8.15 (Berkeley) 5/1/95"; 46#endif 47static const char rcsid[] = 48 "$FreeBSD: head/usr.sbin/mountd/mountd.c 91354 2002-02-27 04:45:37Z dd $"; 49#endif /*not lint*/ 50 51#include <sys/param.h> 52#include <sys/mount.h> 53#include <sys/fcntl.h> 54#include <sys/stat.h> 55#include <sys/syslog.h> 56#include <sys/sysctl.h> 57 58#include <rpc/rpc.h> 59#include <rpc/pmap_clnt.h> 60#include <rpc/pmap_prot.h> 61#include <rpcsvc/mount.h> 62#include <nfs/rpcv2.h> 63#include <nfs/nfsproto.h> 64#include <nfsserver/nfs.h> 65#include <ufs/ufs/ufsmount.h> 66#include <fs/msdosfs/msdosfsmount.h> 67#include <fs/ntfs/ntfsmount.h> 68#include <isofs/cd9660/cd9660_mount.h> /* XXX need isofs in include */ 69 70#include <arpa/inet.h> 71 72#include <ctype.h> 73#include <err.h> 74#include <errno.h> 75#include <grp.h> 76#include <netdb.h> 77#include <pwd.h> 78#include <signal.h> 79#include <stdio.h> 80#include <stdlib.h> 81#include <string.h> 82#include <unistd.h> 83#include "pathnames.h" 84 85#ifdef DEBUG 86#include <stdarg.h> 87#endif 88 89#ifndef MOUNTDLOCK 90#define MOUNTDLOCK "/var/run/mountd.lock" 91#endif 92 93/* 94 * Structures for keeping the mount list and export list 95 */ 96struct mountlist { 97 struct mountlist *ml_next; 98 char ml_host[RPCMNT_NAMELEN+1]; 99 char ml_dirp[RPCMNT_PATHLEN+1]; 100}; 101 102struct dirlist { 103 struct dirlist *dp_left; 104 struct dirlist *dp_right; 105 int dp_flag; 106 struct hostlist *dp_hosts; /* List of hosts this dir exported to */ 107 char dp_dirp[1]; /* Actually malloc'd to size of dir */ 108}; 109/* dp_flag bits */ 110#define DP_DEFSET 0x1 111#define DP_HOSTSET 0x2 112 113struct exportlist { 114 struct exportlist *ex_next; 115 struct dirlist *ex_dirl; 116 struct dirlist *ex_defdir; 117 int ex_flag; 118 fsid_t ex_fs; 119 char *ex_fsdir; 120 char *ex_indexfile; 121}; 122/* ex_flag bits */ 123#define EX_LINKED 0x1 124 125struct netmsk { 126 struct sockaddr_storage nt_net; 127 struct sockaddr_storage nt_mask; 128 char *nt_name; 129}; 130 131union grouptypes { 132 struct addrinfo *gt_addrinfo; 133 struct netmsk gt_net; 134}; 135 136struct grouplist { 137 int gr_type; 138 union grouptypes gr_ptr; 139 struct grouplist *gr_next; 140}; 141/* Group types */ 142#define GT_NULL 0x0 143#define GT_HOST 0x1 144#define GT_NET 0x2 145#define GT_DEFAULT 0x3 146#define GT_IGNORE 0x5 147 148struct hostlist { 149 int ht_flag; /* Uses DP_xx bits */ 150 struct grouplist *ht_grp; 151 struct hostlist *ht_next; 152}; 153 154struct fhreturn { 155 int fhr_flag; 156 int fhr_vers; 157 nfsfh_t fhr_fh; 158}; 159 160/* Global defs */ 161char *add_expdir __P((struct dirlist **, char *, int)); 162void add_dlist __P((struct dirlist **, struct dirlist *, 163 struct grouplist *, int)); 164void add_mlist __P((char *, char *)); 165int check_dirpath __P((char *)); 166int check_options __P((struct dirlist *)); 167int checkmask(struct sockaddr *sa); 168int chk_host __P((struct dirlist *, struct sockaddr *, int *, int *)); 169void del_mlist(char *hostp, char *dirp); 170struct dirlist *dirp_search __P((struct dirlist *, char *)); 171int do_mount __P((struct exportlist *, struct grouplist *, int, 172 struct xucred *, char *, int, struct statfs *)); 173int do_opt __P((char **, char **, struct exportlist *, struct grouplist *, 174 int *, int *, struct xucred *)); 175struct exportlist *ex_search __P((fsid_t *)); 176struct exportlist *get_exp __P((void)); 177void free_dir __P((struct dirlist *)); 178void free_exp __P((struct exportlist *)); 179void free_grp __P((struct grouplist *)); 180void free_host __P((struct hostlist *)); 181void get_exportlist __P((void)); 182int get_host __P((char *, struct grouplist *, struct grouplist *)); 183struct hostlist *get_ht __P((void)); 184int get_line __P((void)); 185void get_mountlist __P((void)); 186int get_net __P((char *, struct netmsk *, int)); 187void getexp_err __P((struct exportlist *, struct grouplist *)); 188struct grouplist *get_grp __P((void)); 189void hang_dirp __P((struct dirlist *, struct grouplist *, 190 struct exportlist *, int)); 191void huphandler(int sig); 192int makemask(struct sockaddr_storage *ssp, int bitlen); 193void mntsrv __P((struct svc_req *, SVCXPRT *)); 194void nextfield __P((char **, char **)); 195void out_of_mem __P((void)); 196void parsecred __P((char *, struct xucred *)); 197int put_exlist __P((struct dirlist *, XDR *, struct dirlist *, int *)); 198void *sa_rawaddr(struct sockaddr *sa, int *nbytes); 199int sacmp(struct sockaddr *sa1, struct sockaddr *sa2, 200 struct sockaddr *samask); 201int scan_tree __P((struct dirlist *, struct sockaddr *)); 202static void usage __P((void)); 203int xdr_dir __P((XDR *, char *)); 204int xdr_explist __P((XDR *, caddr_t)); 205int xdr_fhs __P((XDR *, caddr_t)); 206int xdr_mlist __P((XDR *, caddr_t)); 207void terminate __P((int)); 208 209struct exportlist *exphead; 210struct mountlist *mlhead; 211struct grouplist *grphead; 212char exname[MAXPATHLEN]; 213struct xucred def_anon = { 214 XUCRED_VERSION, 215 (uid_t)-2, 216 1, 217 { (gid_t)-2 }, 218 NULL 219}; 220int force_v2 = 0; 221int resvport_only = 1; 222int dir_only = 1; 223int log = 0; 224int got_sighup = 0; 225 226int opt_flags; 227static int have_v6 = 1; 228#ifdef NI_WITHSCOPEID 229static const int ninumeric = NI_NUMERICHOST | NI_WITHSCOPEID; 230#else 231static const int ninumeric = NI_NUMERICHOST; 232#endif 233 234int mountdlockfd; 235/* Bits for opt_flags above */ 236#define OP_MAPROOT 0x01 237#define OP_MAPALL 0x02 238/* 0x4 free */ 239#define OP_MASK 0x08 240#define OP_NET 0x10 241#define OP_ALLDIRS 0x40 242#define OP_HAVEMASK 0x80 /* A mask was specified or inferred. */ 243#define OP_MASKLEN 0x200 244 245#ifdef DEBUG 246int debug = 1; 247void SYSLOG __P((int, const char *, ...)) __printflike(2, 3); 248#define syslog SYSLOG 249#else 250int debug = 0; 251#endif 252 253/* 254 * Mountd server for NFS mount protocol as described in: 255 * NFS: Network File System Protocol Specification, RFC1094, Appendix A 256 * The optional arguments are the exports file name 257 * default: _PATH_EXPORTS 258 * and "-n" to allow nonroot mount. 259 */ 260int 261main(argc, argv) 262 int argc; 263 char **argv; 264{ 265 fd_set readfds; 266 SVCXPRT *udptransp, *tcptransp, *udp6transp, *tcp6transp; 267 struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf; 268 int udpsock, tcpsock, udp6sock, tcp6sock; 269 int xcreated = 0, s; 270 int one = 1; 271 int c, error; 272 273 udp6conf = tcp6conf = NULL; 274 udp6sock = tcp6sock = NULL; 275 276 /* Check that another mountd isn't already running. */ 277 if ((mountdlockfd = (open(MOUNTDLOCK, O_RDONLY|O_CREAT, 0444))) == -1) 278 err(1, "%s", MOUNTDLOCK); 279 280 if(flock(mountdlockfd, LOCK_EX|LOCK_NB) == -1 && errno == EWOULDBLOCK) 281 errx(1, "another rpc.mountd is already running. Aborting"); 282 s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP); 283 if (s < 0) 284 have_v6 = 0; 285 else 286 close(s); 287 if (modfind("nfsserver") < 0) { 288 /* Not present in kernel, try loading it */ 289 if (kldload("nfsserver") < 0 || modfind("nfsserver") < 0) 290 errx(1, "NFS server is not available or loadable"); 291 } 292 293 while ((c = getopt(argc, argv, "2dlnr")) != -1) 294 switch (c) { 295 case '2': 296 force_v2 = 1; 297 break; 298 case 'n': 299 resvport_only = 0; 300 break; 301 case 'r': 302 dir_only = 0; 303 break; 304 case 'd': 305 debug = debug ? 0 : 1; 306 break; 307 case 'l': 308 log = 1; 309 break; 310 default: 311 usage(); 312 }; 313 argc -= optind; 314 argv += optind; 315 grphead = (struct grouplist *)NULL; 316 exphead = (struct exportlist *)NULL; 317 mlhead = (struct mountlist *)NULL; 318 if (argc == 1) { 319 strncpy(exname, *argv, MAXPATHLEN-1); 320 exname[MAXPATHLEN-1] = '\0'; 321 } else 322 strcpy(exname, _PATH_EXPORTS); 323 openlog("mountd", LOG_PID, LOG_DAEMON); 324 if (debug) 325 warnx("getting export list"); 326 get_exportlist(); 327 if (debug) 328 warnx("getting mount list"); 329 get_mountlist(); 330 if (debug) 331 warnx("here we go"); 332 if (debug == 0) { 333 daemon(0, 0); 334 signal(SIGINT, SIG_IGN); 335 signal(SIGQUIT, SIG_IGN); 336 } 337 signal(SIGHUP, huphandler); 338 signal(SIGTERM, terminate); 339 { FILE *pidfile = fopen(_PATH_MOUNTDPID, "w"); 340 if (pidfile != NULL) { 341 fprintf(pidfile, "%d\n", getpid()); 342 fclose(pidfile); 343 } 344 } 345 rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL); 346 rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL); 347 udpsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); 348 tcpsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); 349 udpconf = getnetconfigent("udp"); 350 tcpconf = getnetconfigent("tcp"); 351 if (!have_v6) 352 goto skip_v6; 353 udp6sock = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP); 354 tcp6sock = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP); 355 /* 356 * We're doing host-based access checks here, so don't allow 357 * v4-in-v6 to confuse things. The kernel will disable it 358 * by default on NFS sockets too. 359 */ 360 if (udp6sock != -1 && setsockopt(udp6sock, IPPROTO_IPV6, 361 IPV6_BINDV6ONLY, &one, sizeof one) < 0){ 362 syslog(LOG_ERR, "can't disable v4-in-v6 on UDP socket"); 363 exit(1); 364 } 365 if (tcp6sock != -1 && setsockopt(tcp6sock, IPPROTO_IPV6, 366 IPV6_BINDV6ONLY, &one, sizeof one) < 0){ 367 syslog(LOG_ERR, "can't disable v4-in-v6 on UDP socket"); 368 exit(1); 369 } 370 udp6conf = getnetconfigent("udp6"); 371 tcp6conf = getnetconfigent("tcp6"); 372 373skip_v6: 374 if (!resvport_only) { 375 if (sysctlbyname("vfs.nfsrv.nfs_privport", NULL, NULL, 376 &resvport_only, sizeof(resvport_only)) != 0 && 377 errno != ENOENT) { 378 syslog(LOG_ERR, "sysctl: %m"); 379 exit(1); 380 } 381 } 382 if ((udptransp = svcudp_create(RPC_ANYSOCK)) == NULL || 383 (tcptransp = svctcp_create(RPC_ANYSOCK, 0, 0)) == NULL) { 384 syslog(LOG_ERR, "can't create socket"); 385 exit(1); 386 } 387 if (udpsock != -1 && udpconf != NULL) { 388 bindresvport(udpsock, NULL); 389 udptransp = svc_dg_create(udpsock, 0, 0); 390 if (udptransp != NULL) { 391 if (!svc_reg(udptransp, RPCPROG_MNT, RPCMNT_VER1, 392 mntsrv, udpconf)) 393 syslog(LOG_WARNING, "can't register UDP RPCMNT_VER1 service"); 394 else 395 xcreated++; 396 if (!force_v2) { 397 if (!svc_reg(udptransp, RPCPROG_MNT, RPCMNT_VER3, 398 mntsrv, udpconf)) 399 syslog(LOG_WARNING, "can't register UDP RPCMNT_VER3 service"); 400 else 401 xcreated++; 402 } 403 } else 404 syslog(LOG_WARNING, "can't create UDP services"); 405 406 } 407 if (tcpsock != -1 && tcpconf != NULL) { 408 bindresvport(tcpsock, NULL); 409 listen(tcpsock, SOMAXCONN); 410 tcptransp = svc_vc_create(tcpsock, 0, 0); 411 if (tcptransp != NULL) { 412 if (!svc_reg(tcptransp, RPCPROG_MNT, RPCMNT_VER1, 413 mntsrv, tcpconf)) 414 syslog(LOG_WARNING, "can't register TCP RPCMNT_VER1 service"); 415 else 416 xcreated++; 417 if (!force_v2) { 418 if (!svc_reg(tcptransp, RPCPROG_MNT, RPCMNT_VER3, 419 mntsrv, tcpconf)) 420 syslog(LOG_WARNING, "can't register TCP RPCMNT_VER3 service"); 421 else 422 xcreated++; 423 } 424 } else 425 syslog(LOG_WARNING, "can't create TCP service"); 426 427 } 428 if (have_v6 && udp6sock != -1 && udp6conf != NULL) { 429 bindresvport(udp6sock, NULL); 430 udp6transp = svc_dg_create(udp6sock, 0, 0); 431 if (udp6transp != NULL) { 432 if (!svc_reg(udp6transp, RPCPROG_MNT, RPCMNT_VER1, 433 mntsrv, udp6conf)) 434 syslog(LOG_WARNING, "can't register UDP6 RPCMNT_VER1 service"); 435 else 436 xcreated++; 437 if (!force_v2) { 438 if (!svc_reg(udp6transp, RPCPROG_MNT, RPCMNT_VER3, 439 mntsrv, udp6conf)) 440 syslog(LOG_WARNING, "can't register UDP6 RPCMNT_VER3 service"); 441 else 442 xcreated++; 443 } 444 } else 445 syslog(LOG_WARNING, "can't create UDP6 service"); 446 447 } 448 if (have_v6 && tcp6sock != -1 && tcp6conf != NULL) { 449 bindresvport(tcp6sock, NULL); 450 listen(tcp6sock, SOMAXCONN); 451 tcp6transp = svc_vc_create(tcp6sock, 0, 0); 452 if (tcp6transp != NULL) { 453 if (!svc_reg(tcp6transp, RPCPROG_MNT, RPCMNT_VER1, 454 mntsrv, tcp6conf)) 455 syslog(LOG_WARNING, "can't register TCP6 RPCMNT_VER1 service"); 456 else 457 xcreated++; 458 if (!force_v2) { 459 if (!svc_reg(tcp6transp, RPCPROG_MNT, RPCMNT_VER3, 460 mntsrv, tcp6conf)) 461 syslog(LOG_WARNING, "can't register TCP6 RPCMNT_VER3 service"); 462 else 463 xcreated++; 464 } 465 } else 466 syslog(LOG_WARNING, "can't create TCP6 service"); 467 468 } 469 if (xcreated == 0) { 470 syslog(LOG_ERR, "could not create any services"); 471 exit(1); 472 } 473 474 /* Expand svc_run() here so that we can call get_exportlist(). */ 475 for (;;) { 476 if (got_sighup) { 477 get_exportlist(); 478 got_sighup = 0; 479 } 480 readfds = svc_fdset; 481 switch (select(svc_maxfd + 1, &readfds, NULL, NULL, NULL)) { 482 case -1: 483 if (errno == EINTR) 484 continue; 485 syslog(LOG_ERR, "mountd died: select: %m"); 486 exit(1); 487 case 0: 488 continue; 489 default: 490 svc_getreqset(&readfds); 491 } 492 } 493} 494 495static void 496usage() 497{ 498 fprintf(stderr, 499 "usage: mountd [-2] [-d] [-l] [-n] [-r] [export_file]\n"); 500 exit(1); 501} 502 503/* 504 * The mount rpc service 505 */ 506void 507mntsrv(rqstp, transp) 508 struct svc_req *rqstp; 509 SVCXPRT *transp; 510{ 511 struct exportlist *ep; 512 struct dirlist *dp; 513 struct fhreturn fhr; 514 struct stat stb; 515 struct statfs fsb; 516 struct addrinfo *ai; 517 char host[NI_MAXHOST], numerichost[NI_MAXHOST]; 518 int lookup_failed = 1; 519 struct sockaddr *saddr; 520 u_short sport; 521 char rpcpath[RPCMNT_PATHLEN + 1], dirpath[MAXPATHLEN]; 522 int bad = 0, defset, hostset; 523 sigset_t sighup_mask; 524 525 sigemptyset(&sighup_mask); 526 sigaddset(&sighup_mask, SIGHUP); 527 saddr = svc_getrpccaller(transp)->buf; 528 switch (saddr->sa_family) { 529 case AF_INET6: 530 sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port); 531 break; 532 case AF_INET: 533 sport = ntohs(((struct sockaddr_in *)saddr)->sin_port); 534 break; 535 default: 536 syslog(LOG_ERR, "request from unknown address family"); 537 return; 538 } 539 lookup_failed = getnameinfo(saddr, saddr->sa_len, host, sizeof host, 540 NULL, 0, 0); 541 getnameinfo(saddr, saddr->sa_len, numerichost, 542 sizeof numerichost, NULL, 0, NI_NUMERICHOST); 543 ai = NULL; 544 switch (rqstp->rq_proc) { 545 case NULLPROC: 546 if (!svc_sendreply(transp, xdr_void, (caddr_t)NULL)) 547 syslog(LOG_ERR, "can't send reply"); 548 return; 549 case RPCMNT_MOUNT: 550 if (sport >= IPPORT_RESERVED && resvport_only) { 551 syslog(LOG_NOTICE, 552 "mount request from %s from unprivileged port", 553 numerichost); 554 svcerr_weakauth(transp); 555 return; 556 } 557 if (!svc_getargs(transp, xdr_dir, rpcpath)) { 558 syslog(LOG_NOTICE, "undecodable mount request from %s", 559 numerichost); 560 svcerr_decode(transp); 561 return; 562 } 563 564 /* 565 * Get the real pathname and make sure it is a directory 566 * or a regular file if the -r option was specified 567 * and it exists. 568 */ 569 if (realpath(rpcpath, dirpath) == NULL || 570 stat(dirpath, &stb) < 0 || 571 (!S_ISDIR(stb.st_mode) && 572 (dir_only || !S_ISREG(stb.st_mode))) || 573 statfs(dirpath, &fsb) < 0) { 574 chdir("/"); /* Just in case realpath doesn't */ 575 syslog(LOG_NOTICE, 576 "mount request from %s for non existent path %s", 577 numerichost, dirpath); 578 if (debug) 579 warnx("stat failed on %s", dirpath); 580 bad = ENOENT; /* We will send error reply later */ 581 } 582 583 /* Check in the exports list */ 584 sigprocmask(SIG_BLOCK, &sighup_mask, NULL); 585 ep = ex_search(&fsb.f_fsid); 586 hostset = defset = 0; 587 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset) || 588 ((dp = dirp_search(ep->ex_dirl, dirpath)) && 589 chk_host(dp, saddr, &defset, &hostset)) || 590 (defset && scan_tree(ep->ex_defdir, saddr) == 0 && 591 scan_tree(ep->ex_dirl, saddr) == 0))) { 592 if (bad) { 593 if (!svc_sendreply(transp, xdr_long, 594 (caddr_t)&bad)) 595 syslog(LOG_ERR, "can't send reply"); 596 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 597 return; 598 } 599 if (hostset & DP_HOSTSET) 600 fhr.fhr_flag = hostset; 601 else 602 fhr.fhr_flag = defset; 603 fhr.fhr_vers = rqstp->rq_vers; 604 /* Get the file handle */ 605 memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t)); 606 if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) { 607 bad = errno; 608 syslog(LOG_ERR, "can't get fh for %s", dirpath); 609 if (!svc_sendreply(transp, xdr_long, 610 (caddr_t)&bad)) 611 syslog(LOG_ERR, "can't send reply"); 612 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 613 return; 614 } 615 if (!svc_sendreply(transp, xdr_fhs, (caddr_t)&fhr)) 616 syslog(LOG_ERR, "can't send reply"); 617 if (!lookup_failed) 618 add_mlist(host, dirpath); 619 else 620 add_mlist(numerichost, dirpath); 621 if (debug) 622 warnx("mount successful"); 623 if (log) 624 syslog(LOG_NOTICE, 625 "mount request succeeded from %s for %s", 626 numerichost, dirpath); 627 } else { 628 bad = EACCES; 629 syslog(LOG_NOTICE, 630 "mount request denied from %s for %s", 631 numerichost, dirpath); 632 } 633 634 if (bad && !svc_sendreply(transp, xdr_long, (caddr_t)&bad)) 635 syslog(LOG_ERR, "can't send reply"); 636 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 637 return; 638 case RPCMNT_DUMP: 639 if (!svc_sendreply(transp, xdr_mlist, (caddr_t)NULL)) 640 syslog(LOG_ERR, "can't send reply"); 641 else if (log) 642 syslog(LOG_NOTICE, 643 "dump request succeeded from %s", 644 numerichost); 645 return; 646 case RPCMNT_UMOUNT: 647 if (sport >= IPPORT_RESERVED && resvport_only) { 648 syslog(LOG_NOTICE, 649 "umount request from %s from unprivileged port", 650 numerichost); 651 svcerr_weakauth(transp); 652 return; 653 } 654 if (!svc_getargs(transp, xdr_dir, rpcpath)) { 655 syslog(LOG_NOTICE, "undecodable umount request from %s", 656 numerichost); 657 svcerr_decode(transp); 658 return; 659 } 660 if (realpath(rpcpath, dirpath) == NULL) { 661 syslog(LOG_NOTICE, "umount request from %s " 662 "for non existent path %s", 663 numerichost, dirpath); 664 } 665 if (!svc_sendreply(transp, xdr_void, (caddr_t)NULL)) 666 syslog(LOG_ERR, "can't send reply"); 667 if (!lookup_failed) 668 del_mlist(host, dirpath); 669 del_mlist(numerichost, dirpath); 670 if (log) 671 syslog(LOG_NOTICE, 672 "umount request succeeded from %s for %s", 673 numerichost, dirpath); 674 return; 675 case RPCMNT_UMNTALL: 676 if (sport >= IPPORT_RESERVED && resvport_only) { 677 syslog(LOG_NOTICE, 678 "umountall request from %s from unprivileged port", 679 numerichost); 680 svcerr_weakauth(transp); 681 return; 682 } 683 if (!svc_sendreply(transp, xdr_void, (caddr_t)NULL)) 684 syslog(LOG_ERR, "can't send reply"); 685 if (!lookup_failed) 686 del_mlist(host, NULL); 687 del_mlist(numerichost, NULL); 688 if (log) 689 syslog(LOG_NOTICE, 690 "umountall request succeeded from %s", 691 numerichost); 692 return; 693 case RPCMNT_EXPORT: 694 if (!svc_sendreply(transp, xdr_explist, (caddr_t)NULL)) 695 syslog(LOG_ERR, "can't send reply"); 696 if (log) 697 syslog(LOG_NOTICE, 698 "export request succeeded from %s", 699 numerichost); 700 return; 701 default: 702 svcerr_noproc(transp); 703 return; 704 } 705} 706 707/* 708 * Xdr conversion for a dirpath string 709 */ 710int 711xdr_dir(xdrsp, dirp) 712 XDR *xdrsp; 713 char *dirp; 714{ 715 return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN)); 716} 717 718/* 719 * Xdr routine to generate file handle reply 720 */ 721int 722xdr_fhs(xdrsp, cp) 723 XDR *xdrsp; 724 caddr_t cp; 725{ 726 register struct fhreturn *fhrp = (struct fhreturn *)cp; 727 u_long ok = 0, len, auth; 728 729 if (!xdr_long(xdrsp, &ok)) 730 return (0); 731 switch (fhrp->fhr_vers) { 732 case 1: 733 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH)); 734 case 3: 735 len = NFSX_V3FH; 736 if (!xdr_long(xdrsp, &len)) 737 return (0); 738 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len)) 739 return (0); 740 auth = RPCAUTH_UNIX; 741 len = 1; 742 if (!xdr_long(xdrsp, &len)) 743 return (0); 744 return (xdr_long(xdrsp, &auth)); 745 }; 746 return (0); 747} 748 749int 750xdr_mlist(xdrsp, cp) 751 XDR *xdrsp; 752 caddr_t cp; 753{ 754 struct mountlist *mlp; 755 int true = 1; 756 int false = 0; 757 char *strp; 758 759 mlp = mlhead; 760 while (mlp) { 761 if (!xdr_bool(xdrsp, &true)) 762 return (0); 763 strp = &mlp->ml_host[0]; 764 if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN)) 765 return (0); 766 strp = &mlp->ml_dirp[0]; 767 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN)) 768 return (0); 769 mlp = mlp->ml_next; 770 } 771 if (!xdr_bool(xdrsp, &false)) 772 return (0); 773 return (1); 774} 775 776/* 777 * Xdr conversion for export list 778 */ 779int 780xdr_explist(xdrsp, cp) 781 XDR *xdrsp; 782 caddr_t cp; 783{ 784 struct exportlist *ep; 785 int false = 0; 786 int putdef; 787 sigset_t sighup_mask; 788 789 sigemptyset(&sighup_mask); 790 sigaddset(&sighup_mask, SIGHUP); 791 sigprocmask(SIG_BLOCK, &sighup_mask, NULL); 792 ep = exphead; 793 while (ep) { 794 putdef = 0; 795 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir, &putdef)) 796 goto errout; 797 if (ep->ex_defdir && putdef == 0 && 798 put_exlist(ep->ex_defdir, xdrsp, (struct dirlist *)NULL, 799 &putdef)) 800 goto errout; 801 ep = ep->ex_next; 802 } 803 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 804 if (!xdr_bool(xdrsp, &false)) 805 return (0); 806 return (1); 807errout: 808 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 809 return (0); 810} 811 812/* 813 * Called from xdr_explist() to traverse the tree and export the 814 * directory paths. 815 */ 816int 817put_exlist(dp, xdrsp, adp, putdefp) 818 struct dirlist *dp; 819 XDR *xdrsp; 820 struct dirlist *adp; 821 int *putdefp; 822{ 823 struct grouplist *grp; 824 struct hostlist *hp; 825 int true = 1; 826 int false = 0; 827 int gotalldir = 0; 828 char *strp; 829 830 if (dp) { 831 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp)) 832 return (1); 833 if (!xdr_bool(xdrsp, &true)) 834 return (1); 835 strp = dp->dp_dirp; 836 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN)) 837 return (1); 838 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) { 839 gotalldir = 1; 840 *putdefp = 1; 841 } 842 if ((dp->dp_flag & DP_DEFSET) == 0 && 843 (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) { 844 hp = dp->dp_hosts; 845 while (hp) { 846 grp = hp->ht_grp; 847 if (grp->gr_type == GT_HOST) { 848 if (!xdr_bool(xdrsp, &true)) 849 return (1); 850 strp = grp->gr_ptr.gt_addrinfo->ai_canonname; 851 if (!xdr_string(xdrsp, &strp, 852 RPCMNT_NAMELEN)) 853 return (1); 854 } else if (grp->gr_type == GT_NET) { 855 if (!xdr_bool(xdrsp, &true)) 856 return (1); 857 strp = grp->gr_ptr.gt_net.nt_name; 858 if (!xdr_string(xdrsp, &strp, 859 RPCMNT_NAMELEN)) 860 return (1); 861 } 862 hp = hp->ht_next; 863 if (gotalldir && hp == (struct hostlist *)NULL) { 864 hp = adp->dp_hosts; 865 gotalldir = 0; 866 } 867 } 868 } 869 if (!xdr_bool(xdrsp, &false)) 870 return (1); 871 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp)) 872 return (1); 873 } 874 return (0); 875} 876 877#define LINESIZ 10240 878char line[LINESIZ]; 879FILE *exp_file; 880 881/* 882 * Get the export list 883 */ 884void 885get_exportlist() 886{ 887 struct exportlist *ep, *ep2; 888 struct grouplist *grp, *tgrp; 889 struct exportlist **epp; 890 struct dirlist *dirhead; 891 struct statfs fsb, *fsp; 892 struct xucred anon; 893 char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc; 894 int len, has_host, exflags, got_nondir, dirplen, num, i, netgrp; 895 896 dirp = NULL; 897 dirplen = 0; 898 899 /* 900 * First, get rid of the old list 901 */ 902 ep = exphead; 903 while (ep) { 904 ep2 = ep; 905 ep = ep->ex_next; 906 free_exp(ep2); 907 } 908 exphead = (struct exportlist *)NULL; 909 910 grp = grphead; 911 while (grp) { 912 tgrp = grp; 913 grp = grp->gr_next; 914 free_grp(tgrp); 915 } 916 grphead = (struct grouplist *)NULL; 917 918 /* 919 * And delete exports that are in the kernel for all local 920 * file systems. 921 * XXX: Should know how to handle all local exportable file systems 922 * instead of just "ufs". 923 */ 924 num = getmntinfo(&fsp, MNT_NOWAIT); 925 for (i = 0; i < num; i++) { 926 union { 927 struct ufs_args ua; 928 struct iso_args ia; 929 struct msdosfs_args da; 930 struct ntfs_args na; 931 } targs; 932 933 if (!strcmp(fsp->f_fstypename, "ufs") || 934 !strcmp(fsp->f_fstypename, "msdosfs") || 935 !strcmp(fsp->f_fstypename, "ntfs") || 936 !strcmp(fsp->f_fstypename, "cd9660")) { 937 targs.ua.fspec = NULL; 938 targs.ua.export.ex_flags = MNT_DELEXPORT; 939 if (mount(fsp->f_fstypename, fsp->f_mntonname, 940 fsp->f_flags | MNT_UPDATE, (caddr_t)&targs) < 0 && 941 errno != ENOENT) 942 syslog(LOG_ERR, 943 "can't delete exports for %s: %m", 944 fsp->f_mntonname); 945 } 946 fsp++; 947 } 948 949 /* 950 * Read in the exports file and build the list, calling 951 * mount() as we go along to push the export rules into the kernel. 952 */ 953 if ((exp_file = fopen(exname, "r")) == NULL) { 954 syslog(LOG_ERR, "can't open %s", exname); 955 exit(2); 956 } 957 dirhead = (struct dirlist *)NULL; 958 while (get_line()) { 959 if (debug) 960 warnx("got line %s", line); 961 cp = line; 962 nextfield(&cp, &endcp); 963 if (*cp == '#') 964 goto nextline; 965 966 /* 967 * Set defaults. 968 */ 969 has_host = FALSE; 970 anon = def_anon; 971 exflags = MNT_EXPORTED; 972 got_nondir = 0; 973 opt_flags = 0; 974 ep = (struct exportlist *)NULL; 975 976 /* 977 * Create new exports list entry 978 */ 979 len = endcp-cp; 980 tgrp = grp = get_grp(); 981 while (len > 0) { 982 if (len > RPCMNT_NAMELEN) { 983 getexp_err(ep, tgrp); 984 goto nextline; 985 } 986 if (*cp == '-') { 987 if (ep == (struct exportlist *)NULL) { 988 getexp_err(ep, tgrp); 989 goto nextline; 990 } 991 if (debug) 992 warnx("doing opt %s", cp); 993 got_nondir = 1; 994 if (do_opt(&cp, &endcp, ep, grp, &has_host, 995 &exflags, &anon)) { 996 getexp_err(ep, tgrp); 997 goto nextline; 998 } 999 } else if (*cp == '/') { 1000 savedc = *endcp; 1001 *endcp = '\0'; 1002 if (check_dirpath(cp) && 1003 statfs(cp, &fsb) >= 0) { 1004 if (got_nondir) { 1005 syslog(LOG_ERR, "dirs must be first"); 1006 getexp_err(ep, tgrp); 1007 goto nextline; 1008 } 1009 if (ep) { 1010 if (ep->ex_fs.val[0] != fsb.f_fsid.val[0] || 1011 ep->ex_fs.val[1] != fsb.f_fsid.val[1]) { 1012 getexp_err(ep, tgrp); 1013 goto nextline; 1014 } 1015 } else { 1016 /* 1017 * See if this directory is already 1018 * in the list. 1019 */ 1020 ep = ex_search(&fsb.f_fsid); 1021 if (ep == (struct exportlist *)NULL) { 1022 ep = get_exp(); 1023 ep->ex_fs = fsb.f_fsid; 1024 ep->ex_fsdir = (char *) 1025 malloc(strlen(fsb.f_mntonname) + 1); 1026 if (ep->ex_fsdir) 1027 strcpy(ep->ex_fsdir, 1028 fsb.f_mntonname); 1029 else 1030 out_of_mem(); 1031 if (debug) 1032 warnx("making new ep fs=0x%x,0x%x", 1033 fsb.f_fsid.val[0], 1034 fsb.f_fsid.val[1]); 1035 } else if (debug) 1036 warnx("found ep fs=0x%x,0x%x", 1037 fsb.f_fsid.val[0], 1038 fsb.f_fsid.val[1]); 1039 } 1040 1041 /* 1042 * Add dirpath to export mount point. 1043 */ 1044 dirp = add_expdir(&dirhead, cp, len); 1045 dirplen = len; 1046 } else { 1047 getexp_err(ep, tgrp); 1048 goto nextline; 1049 } 1050 *endcp = savedc; 1051 } else { 1052 savedc = *endcp; 1053 *endcp = '\0'; 1054 got_nondir = 1; 1055 if (ep == (struct exportlist *)NULL) { 1056 getexp_err(ep, tgrp); 1057 goto nextline; 1058 } 1059 1060 /* 1061 * Get the host or netgroup. 1062 */ 1063 setnetgrent(cp); 1064 netgrp = getnetgrent(&hst, &usr, &dom); 1065 do { 1066 if (has_host) { 1067 grp->gr_next = get_grp(); 1068 grp = grp->gr_next; 1069 } 1070 if (netgrp) { 1071 if (hst == 0) { 1072 syslog(LOG_ERR, 1073 "null hostname in netgroup %s, skipping", cp); 1074 grp->gr_type = GT_IGNORE; 1075 } else if (get_host(hst, grp, tgrp)) { 1076 syslog(LOG_ERR, 1077 "bad host %s in netgroup %s, skipping", hst, cp); 1078 grp->gr_type = GT_IGNORE; 1079 } 1080 } else if (get_host(cp, grp, tgrp)) { 1081 syslog(LOG_ERR, "bad host %s, skipping", cp); 1082 grp->gr_type = GT_IGNORE; 1083 } 1084 has_host = TRUE; 1085 } while (netgrp && getnetgrent(&hst, &usr, &dom)); 1086 endnetgrent(); 1087 *endcp = savedc; 1088 } 1089 cp = endcp; 1090 nextfield(&cp, &endcp); 1091 len = endcp - cp; 1092 } 1093 if (check_options(dirhead)) { 1094 getexp_err(ep, tgrp); 1095 goto nextline; 1096 } 1097 if (!has_host) { 1098 grp->gr_type = GT_DEFAULT; 1099 if (debug) 1100 warnx("adding a default entry"); 1101 1102 /* 1103 * Don't allow a network export coincide with a list of 1104 * host(s) on the same line. 1105 */ 1106 } else if ((opt_flags & OP_NET) && tgrp->gr_next) { 1107 syslog(LOG_ERR, "network/host conflict"); 1108 getexp_err(ep, tgrp); 1109 goto nextline; 1110 1111 /* 1112 * If an export list was specified on this line, make sure 1113 * that we have at least one valid entry, otherwise skip it. 1114 */ 1115 } else { 1116 grp = tgrp; 1117 while (grp && grp->gr_type == GT_IGNORE) 1118 grp = grp->gr_next; 1119 if (! grp) { 1120 getexp_err(ep, tgrp); 1121 goto nextline; 1122 } 1123 } 1124 1125 /* 1126 * Loop through hosts, pushing the exports into the kernel. 1127 * After loop, tgrp points to the start of the list and 1128 * grp points to the last entry in the list. 1129 */ 1130 grp = tgrp; 1131 do { 1132 if (do_mount(ep, grp, exflags, &anon, dirp, dirplen, 1133 &fsb)) { 1134 getexp_err(ep, tgrp); 1135 goto nextline; 1136 } 1137 } while (grp->gr_next && (grp = grp->gr_next)); 1138 1139 /* 1140 * Success. Update the data structures. 1141 */ 1142 if (has_host) { 1143 hang_dirp(dirhead, tgrp, ep, opt_flags); 1144 grp->gr_next = grphead; 1145 grphead = tgrp; 1146 } else { 1147 hang_dirp(dirhead, (struct grouplist *)NULL, ep, 1148 opt_flags); 1149 free_grp(grp); 1150 } 1151 dirhead = (struct dirlist *)NULL; 1152 if ((ep->ex_flag & EX_LINKED) == 0) { 1153 ep2 = exphead; 1154 epp = &exphead; 1155 1156 /* 1157 * Insert in the list in alphabetical order. 1158 */ 1159 while (ep2 && strcmp(ep2->ex_fsdir, ep->ex_fsdir) < 0) { 1160 epp = &ep2->ex_next; 1161 ep2 = ep2->ex_next; 1162 } 1163 if (ep2) 1164 ep->ex_next = ep2; 1165 *epp = ep; 1166 ep->ex_flag |= EX_LINKED; 1167 } 1168nextline: 1169 if (dirhead) { 1170 free_dir(dirhead); 1171 dirhead = (struct dirlist *)NULL; 1172 } 1173 } 1174 fclose(exp_file); 1175} 1176 1177/* 1178 * Allocate an export list element 1179 */ 1180struct exportlist * 1181get_exp() 1182{ 1183 struct exportlist *ep; 1184 1185 ep = (struct exportlist *)malloc(sizeof (struct exportlist)); 1186 if (ep == (struct exportlist *)NULL) 1187 out_of_mem(); 1188 memset(ep, 0, sizeof(struct exportlist)); 1189 return (ep); 1190} 1191 1192/* 1193 * Allocate a group list element 1194 */ 1195struct grouplist * 1196get_grp() 1197{ 1198 struct grouplist *gp; 1199 1200 gp = (struct grouplist *)malloc(sizeof (struct grouplist)); 1201 if (gp == (struct grouplist *)NULL) 1202 out_of_mem(); 1203 memset(gp, 0, sizeof(struct grouplist)); 1204 return (gp); 1205} 1206 1207/* 1208 * Clean up upon an error in get_exportlist(). 1209 */ 1210void 1211getexp_err(ep, grp) 1212 struct exportlist *ep; 1213 struct grouplist *grp; 1214{ 1215 struct grouplist *tgrp; 1216 1217 syslog(LOG_ERR, "bad exports list line %s", line); 1218 if (ep && (ep->ex_flag & EX_LINKED) == 0) 1219 free_exp(ep); 1220 while (grp) { 1221 tgrp = grp; 1222 grp = grp->gr_next; 1223 free_grp(tgrp); 1224 } 1225} 1226 1227/* 1228 * Search the export list for a matching fs. 1229 */ 1230struct exportlist * 1231ex_search(fsid) 1232 fsid_t *fsid; 1233{ 1234 struct exportlist *ep; 1235 1236 ep = exphead; 1237 while (ep) { 1238 if (ep->ex_fs.val[0] == fsid->val[0] && 1239 ep->ex_fs.val[1] == fsid->val[1]) 1240 return (ep); 1241 ep = ep->ex_next; 1242 } 1243 return (ep); 1244} 1245 1246/* 1247 * Add a directory path to the list. 1248 */ 1249char * 1250add_expdir(dpp, cp, len) 1251 struct dirlist **dpp; 1252 char *cp; 1253 int len; 1254{ 1255 struct dirlist *dp; 1256 1257 dp = (struct dirlist *)malloc(sizeof (struct dirlist) + len); 1258 if (dp == (struct dirlist *)NULL) 1259 out_of_mem(); 1260 dp->dp_left = *dpp; 1261 dp->dp_right = (struct dirlist *)NULL; 1262 dp->dp_flag = 0; 1263 dp->dp_hosts = (struct hostlist *)NULL; 1264 strcpy(dp->dp_dirp, cp); 1265 *dpp = dp; 1266 return (dp->dp_dirp); 1267} 1268 1269/* 1270 * Hang the dir list element off the dirpath binary tree as required 1271 * and update the entry for host. 1272 */ 1273void 1274hang_dirp(dp, grp, ep, flags) 1275 struct dirlist *dp; 1276 struct grouplist *grp; 1277 struct exportlist *ep; 1278 int flags; 1279{ 1280 struct hostlist *hp; 1281 struct dirlist *dp2; 1282 1283 if (flags & OP_ALLDIRS) { 1284 if (ep->ex_defdir) 1285 free((caddr_t)dp); 1286 else 1287 ep->ex_defdir = dp; 1288 if (grp == (struct grouplist *)NULL) { 1289 ep->ex_defdir->dp_flag |= DP_DEFSET; 1290 } else while (grp) { 1291 hp = get_ht(); 1292 hp->ht_grp = grp; 1293 hp->ht_next = ep->ex_defdir->dp_hosts; 1294 ep->ex_defdir->dp_hosts = hp; 1295 grp = grp->gr_next; 1296 } 1297 } else { 1298 1299 /* 1300 * Loop through the directories adding them to the tree. 1301 */ 1302 while (dp) { 1303 dp2 = dp->dp_left; 1304 add_dlist(&ep->ex_dirl, dp, grp, flags); 1305 dp = dp2; 1306 } 1307 } 1308} 1309 1310/* 1311 * Traverse the binary tree either updating a node that is already there 1312 * for the new directory or adding the new node. 1313 */ 1314void 1315add_dlist(dpp, newdp, grp, flags) 1316 struct dirlist **dpp; 1317 struct dirlist *newdp; 1318 struct grouplist *grp; 1319 int flags; 1320{ 1321 struct dirlist *dp; 1322 struct hostlist *hp; 1323 int cmp; 1324 1325 dp = *dpp; 1326 if (dp) { 1327 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp); 1328 if (cmp > 0) { 1329 add_dlist(&dp->dp_left, newdp, grp, flags); 1330 return; 1331 } else if (cmp < 0) { 1332 add_dlist(&dp->dp_right, newdp, grp, flags); 1333 return; 1334 } else 1335 free((caddr_t)newdp); 1336 } else { 1337 dp = newdp; 1338 dp->dp_left = (struct dirlist *)NULL; 1339 *dpp = dp; 1340 } 1341 if (grp) { 1342 1343 /* 1344 * Hang all of the host(s) off of the directory point. 1345 */ 1346 do { 1347 hp = get_ht(); 1348 hp->ht_grp = grp; 1349 hp->ht_next = dp->dp_hosts; 1350 dp->dp_hosts = hp; 1351 grp = grp->gr_next; 1352 } while (grp); 1353 } else { 1354 dp->dp_flag |= DP_DEFSET; 1355 } 1356} 1357 1358/* 1359 * Search for a dirpath on the export point. 1360 */ 1361struct dirlist * 1362dirp_search(dp, dirp) 1363 struct dirlist *dp; 1364 char *dirp; 1365{ 1366 int cmp; 1367 1368 if (dp) { 1369 cmp = strcmp(dp->dp_dirp, dirp); 1370 if (cmp > 0) 1371 return (dirp_search(dp->dp_left, dirp)); 1372 else if (cmp < 0) 1373 return (dirp_search(dp->dp_right, dirp)); 1374 else 1375 return (dp); 1376 } 1377 return (dp); 1378} 1379 1380/* 1381 * Scan for a host match in a directory tree. 1382 */ 1383int 1384chk_host(dp, saddr, defsetp, hostsetp) 1385 struct dirlist *dp; 1386 struct sockaddr *saddr; 1387 int *defsetp; 1388 int *hostsetp; 1389{ 1390 struct hostlist *hp; 1391 struct grouplist *grp; 1392 struct addrinfo *ai; 1393 1394 if (dp) { 1395 if (dp->dp_flag & DP_DEFSET) 1396 *defsetp = dp->dp_flag; 1397 hp = dp->dp_hosts; 1398 while (hp) { 1399 grp = hp->ht_grp; 1400 switch (grp->gr_type) { 1401 case GT_HOST: 1402 ai = grp->gr_ptr.gt_addrinfo; 1403 for (; ai; ai = ai->ai_next) { 1404 if (!sacmp(ai->ai_addr, saddr, NULL)) { 1405 *hostsetp = 1406 (hp->ht_flag | DP_HOSTSET); 1407 return (1); 1408 } 1409 } 1410 break; 1411 case GT_NET: 1412 if (!sacmp(saddr, (struct sockaddr *) 1413 &grp->gr_ptr.gt_net.nt_net, 1414 (struct sockaddr *) 1415 &grp->gr_ptr.gt_net.nt_mask)) { 1416 *hostsetp = (hp->ht_flag | DP_HOSTSET); 1417 return (1); 1418 } 1419 break; 1420 } 1421 hp = hp->ht_next; 1422 } 1423 } 1424 return (0); 1425} 1426 1427/* 1428 * Scan tree for a host that matches the address. 1429 */ 1430int 1431scan_tree(dp, saddr) 1432 struct dirlist *dp; 1433 struct sockaddr *saddr; 1434{ 1435 int defset, hostset; 1436 1437 if (dp) { 1438 if (scan_tree(dp->dp_left, saddr)) 1439 return (1); 1440 if (chk_host(dp, saddr, &defset, &hostset)) 1441 return (1); 1442 if (scan_tree(dp->dp_right, saddr)) 1443 return (1); 1444 } 1445 return (0); 1446} 1447 1448/* 1449 * Traverse the dirlist tree and free it up. 1450 */ 1451void 1452free_dir(dp) 1453 struct dirlist *dp; 1454{ 1455 1456 if (dp) { 1457 free_dir(dp->dp_left); 1458 free_dir(dp->dp_right); 1459 free_host(dp->dp_hosts); 1460 free((caddr_t)dp); 1461 } 1462} 1463 1464/* 1465 * Parse the option string and update fields. 1466 * Option arguments may either be -<option>=<value> or 1467 * -<option> <value> 1468 */ 1469int 1470do_opt(cpp, endcpp, ep, grp, has_hostp, exflagsp, cr) 1471 char **cpp, **endcpp; 1472 struct exportlist *ep; 1473 struct grouplist *grp; 1474 int *has_hostp; 1475 int *exflagsp; 1476 struct xucred *cr; 1477{ 1478 char *cpoptarg, *cpoptend; 1479 char *cp, *endcp, *cpopt, savedc, savedc2; 1480 int allflag, usedarg; 1481 1482 savedc2 = '\0'; 1483 cpopt = *cpp; 1484 cpopt++; 1485 cp = *endcpp; 1486 savedc = *cp; 1487 *cp = '\0'; 1488 while (cpopt && *cpopt) { 1489 allflag = 1; 1490 usedarg = -2; 1491 if ((cpoptend = strchr(cpopt, ','))) { 1492 *cpoptend++ = '\0'; 1493 if ((cpoptarg = strchr(cpopt, '='))) 1494 *cpoptarg++ = '\0'; 1495 } else { 1496 if ((cpoptarg = strchr(cpopt, '='))) 1497 *cpoptarg++ = '\0'; 1498 else { 1499 *cp = savedc; 1500 nextfield(&cp, &endcp); 1501 **endcpp = '\0'; 1502 if (endcp > cp && *cp != '-') { 1503 cpoptarg = cp; 1504 savedc2 = *endcp; 1505 *endcp = '\0'; 1506 usedarg = 0; 1507 } 1508 } 1509 } 1510 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) { 1511 *exflagsp |= MNT_EXRDONLY; 1512 } else if (cpoptarg && (!strcmp(cpopt, "maproot") || 1513 !(allflag = strcmp(cpopt, "mapall")) || 1514 !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) { 1515 usedarg++; 1516 parsecred(cpoptarg, cr); 1517 if (allflag == 0) { 1518 *exflagsp |= MNT_EXPORTANON; 1519 opt_flags |= OP_MAPALL; 1520 } else 1521 opt_flags |= OP_MAPROOT; 1522 } else if (cpoptarg && (!strcmp(cpopt, "mask") || 1523 !strcmp(cpopt, "m"))) { 1524 if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) { 1525 syslog(LOG_ERR, "bad mask: %s", cpoptarg); 1526 return (1); 1527 } 1528 usedarg++; 1529 opt_flags |= OP_MASK; 1530 } else if (cpoptarg && (!strcmp(cpopt, "network") || 1531 !strcmp(cpopt, "n"))) { 1532 if (strchr(cpoptarg, '/') != NULL) { 1533 if (debug) 1534 fprintf(stderr, "setting OP_MASKLEN\n"); 1535 opt_flags |= OP_MASKLEN; 1536 } 1537 if (grp->gr_type != GT_NULL) { 1538 syslog(LOG_ERR, "network/host conflict"); 1539 return (1); 1540 } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) { 1541 syslog(LOG_ERR, "bad net: %s", cpoptarg); 1542 return (1); 1543 } 1544 grp->gr_type = GT_NET; 1545 *has_hostp = 1; 1546 usedarg++; 1547 opt_flags |= OP_NET; 1548 } else if (!strcmp(cpopt, "alldirs")) { 1549 opt_flags |= OP_ALLDIRS; 1550 } else if (!strcmp(cpopt, "public")) { 1551 *exflagsp |= MNT_EXPUBLIC; 1552 } else if (!strcmp(cpopt, "webnfs")) { 1553 *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON); 1554 opt_flags |= OP_MAPALL; 1555 } else if (cpoptarg && !strcmp(cpopt, "index")) { 1556 ep->ex_indexfile = strdup(cpoptarg); 1557 } else { 1558 syslog(LOG_ERR, "bad opt %s", cpopt); 1559 return (1); 1560 } 1561 if (usedarg >= 0) { 1562 *endcp = savedc2; 1563 **endcpp = savedc; 1564 if (usedarg > 0) { 1565 *cpp = cp; 1566 *endcpp = endcp; 1567 } 1568 return (0); 1569 } 1570 cpopt = cpoptend; 1571 } 1572 **endcpp = savedc; 1573 return (0); 1574} 1575 1576/* 1577 * Translate a character string to the corresponding list of network 1578 * addresses for a hostname. 1579 */ 1580int 1581get_host(cp, grp, tgrp) 1582 char *cp; 1583 struct grouplist *grp; 1584 struct grouplist *tgrp; 1585{ 1586 struct grouplist *checkgrp; 1587 struct addrinfo *ai, *tai, hints; 1588 int ecode; 1589 char host[NI_MAXHOST]; 1590 1591 if (grp->gr_type != GT_NULL) { 1592 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp); 1593 return (1); 1594 } 1595 memset(&hints, 0, sizeof hints); 1596 hints.ai_flags = AI_CANONNAME; 1597 hints.ai_protocol = IPPROTO_UDP; 1598 ecode = getaddrinfo(cp, NULL, &hints, &ai); 1599 if (ecode != 0) { 1600 syslog(LOG_ERR,"can't get address info for host %s", cp); 1601 return 1; 1602 } 1603 grp->gr_ptr.gt_addrinfo = ai; 1604 while (ai != NULL) { 1605 if (ai->ai_canonname == NULL) { 1606 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host, 1607 sizeof host, NULL, 0, ninumeric) != 0) 1608 strlcpy(host, "?", sizeof(host)); 1609 ai->ai_canonname = strdup(host); 1610 ai->ai_flags |= AI_CANONNAME; 1611 } 1612 if (debug) 1613 fprintf(stderr, "got host %s\n", ai->ai_canonname); 1614 /* 1615 * Sanity check: make sure we don't already have an entry 1616 * for this host in the grouplist. 1617 */ 1618 for (checkgrp = tgrp; checkgrp != NULL; 1619 checkgrp = checkgrp->gr_next) { 1620 if (checkgrp->gr_type != GT_HOST) 1621 continue; 1622 for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL; 1623 tai = tai->ai_next) { 1624 if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0) 1625 continue; 1626 if (debug) 1627 fprintf(stderr, 1628 "ignoring duplicate host %s\n", 1629 ai->ai_canonname); 1630 grp->gr_type = GT_IGNORE; 1631 return (0); 1632 } 1633 } 1634 ai = ai->ai_next; 1635 } 1636 grp->gr_type = GT_HOST; 1637 return (0); 1638} 1639 1640/* 1641 * Free up an exports list component 1642 */ 1643void 1644free_exp(ep) 1645 struct exportlist *ep; 1646{ 1647 1648 if (ep->ex_defdir) { 1649 free_host(ep->ex_defdir->dp_hosts); 1650 free((caddr_t)ep->ex_defdir); 1651 } 1652 if (ep->ex_fsdir) 1653 free(ep->ex_fsdir); 1654 if (ep->ex_indexfile) 1655 free(ep->ex_indexfile); 1656 free_dir(ep->ex_dirl); 1657 free((caddr_t)ep); 1658} 1659 1660/* 1661 * Free hosts. 1662 */ 1663void 1664free_host(hp) 1665 struct hostlist *hp; 1666{ 1667 struct hostlist *hp2; 1668 1669 while (hp) { 1670 hp2 = hp; 1671 hp = hp->ht_next; 1672 free((caddr_t)hp2); 1673 } 1674} 1675 1676struct hostlist * 1677get_ht() 1678{ 1679 struct hostlist *hp; 1680 1681 hp = (struct hostlist *)malloc(sizeof (struct hostlist)); 1682 if (hp == (struct hostlist *)NULL) 1683 out_of_mem(); 1684 hp->ht_next = (struct hostlist *)NULL; 1685 hp->ht_flag = 0; 1686 return (hp); 1687} 1688 1689/* 1690 * Out of memory, fatal 1691 */ 1692void 1693out_of_mem() 1694{ 1695 1696 syslog(LOG_ERR, "out of memory"); 1697 exit(2); 1698} 1699 1700/* 1701 * Do the mount syscall with the update flag to push the export info into 1702 * the kernel. 1703 */ 1704int 1705do_mount(ep, grp, exflags, anoncrp, dirp, dirplen, fsb) 1706 struct exportlist *ep; 1707 struct grouplist *grp; 1708 int exflags; 1709 struct xucred *anoncrp; 1710 char *dirp; 1711 int dirplen; 1712 struct statfs *fsb; 1713{ 1714 struct statfs fsb1; 1715 struct addrinfo *ai; 1716 struct export_args *eap; 1717 char *cp = NULL; 1718 int done; 1719 char savedc = '\0'; 1720 union { 1721 struct ufs_args ua; 1722 struct iso_args ia; 1723 struct msdosfs_args da; 1724 struct ntfs_args na; 1725 } args; 1726 1727 bzero(&args, sizeof args); 1728 /* XXX, we assume that all xx_args look like ufs_args. */ 1729 args.ua.fspec = 0; 1730 eap = &args.ua.export; 1731 1732 eap->ex_flags = exflags; 1733 eap->ex_anon = *anoncrp; 1734 eap->ex_indexfile = ep->ex_indexfile; 1735 if (grp->gr_type == GT_HOST) 1736 ai = grp->gr_ptr.gt_addrinfo; 1737 else 1738 ai = NULL; 1739 done = FALSE; 1740 while (!done) { 1741 switch (grp->gr_type) { 1742 case GT_HOST: 1743 if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0) 1744 goto skip; 1745 eap->ex_addr = ai->ai_addr; 1746 eap->ex_addrlen = ai->ai_addrlen; 1747 eap->ex_masklen = 0; 1748 break; 1749 case GT_NET: 1750 if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 && 1751 have_v6 == 0) 1752 goto skip; 1753 eap->ex_addr = 1754 (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net; 1755 eap->ex_addrlen = args.ua.export.ex_addr->sa_len; 1756 eap->ex_mask = 1757 (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask; 1758 eap->ex_masklen = args.ua.export.ex_mask->sa_len; 1759 break; 1760 case GT_DEFAULT: 1761 eap->ex_addr = NULL; 1762 eap->ex_addrlen = 0; 1763 eap->ex_mask = NULL; 1764 eap->ex_masklen = 0; 1765 break; 1766 case GT_IGNORE: 1767 return(0); 1768 break; 1769 default: 1770 syslog(LOG_ERR, "bad grouptype"); 1771 if (cp) 1772 *cp = savedc; 1773 return (1); 1774 }; 1775 1776 /* 1777 * XXX: 1778 * Maybe I should just use the fsb->f_mntonname path instead 1779 * of looping back up the dirp to the mount point?? 1780 * Also, needs to know how to export all types of local 1781 * exportable file systems and not just "ufs". 1782 */ 1783 while (mount(fsb->f_fstypename, dirp, 1784 fsb->f_flags | MNT_UPDATE, (caddr_t)&args) < 0) { 1785 if (cp) 1786 *cp-- = savedc; 1787 else 1788 cp = dirp + dirplen - 1; 1789 if (errno == EPERM) { 1790 if (debug) 1791 warnx("can't change attributes for %s", 1792 dirp); 1793 syslog(LOG_ERR, 1794 "can't change attributes for %s", dirp); 1795 return (1); 1796 } 1797 if (opt_flags & OP_ALLDIRS) { 1798 syslog(LOG_ERR, "could not remount %s: %m", 1799 dirp); 1800 return (1); 1801 } 1802 /* back up over the last component */ 1803 while (*cp == '/' && cp > dirp) 1804 cp--; 1805 while (*(cp - 1) != '/' && cp > dirp) 1806 cp--; 1807 if (cp == dirp) { 1808 if (debug) 1809 warnx("mnt unsucc"); 1810 syslog(LOG_ERR, "can't export %s", dirp); 1811 return (1); 1812 } 1813 savedc = *cp; 1814 *cp = '\0'; 1815 /* Check that we're still on the same filesystem. */ 1816 if (statfs(dirp, &fsb1) != 0 || bcmp(&fsb1.f_fsid, 1817 &fsb->f_fsid, sizeof(fsb1.f_fsid)) != 0) { 1818 *cp = savedc; 1819 syslog(LOG_ERR, "can't export %s", dirp); 1820 return (1); 1821 } 1822 } 1823skip: 1824 if (ai != NULL) 1825 ai = ai->ai_next; 1826 if (ai == NULL) 1827 done = TRUE; 1828 } 1829 if (cp) 1830 *cp = savedc; 1831 return (0); 1832} 1833 1834/* 1835 * Translate a net address. 1836 * 1837 * If `maskflg' is nonzero, then `cp' is a netmask, not a network address. 1838 */ 1839int 1840get_net(cp, net, maskflg) 1841 char *cp; 1842 struct netmsk *net; 1843 int maskflg; 1844{ 1845 struct netent *np = NULL; 1846 char *name, *p, *prefp; 1847 struct sockaddr_in sin; 1848 struct sockaddr *sa = NULL; 1849 struct addrinfo hints, *ai = NULL; 1850 char netname[NI_MAXHOST]; 1851 long preflen; 1852 1853 p = prefp = NULL; 1854 if ((opt_flags & OP_MASKLEN) && !maskflg) { 1855 p = strchr(cp, '/'); 1856 *p = '\0'; 1857 prefp = p + 1; 1858 } 1859 1860 /* 1861 * Check for a numeric address first. We wish to avoid 1862 * possible DNS lookups in getnetbyname(). 1863 */ 1864 if (isxdigit(*cp) || *cp == ':') { 1865 memset(&hints, 0, sizeof hints); 1866 /* Ensure the mask and the network have the same family. */ 1867 if (maskflg && (opt_flags & OP_NET)) 1868 hints.ai_family = net->nt_net.ss_family; 1869 else if (!maskflg && (opt_flags & OP_HAVEMASK)) 1870 hints.ai_family = net->nt_mask.ss_family; 1871 else 1872 hints.ai_family = AF_UNSPEC; 1873 hints.ai_flags = AI_NUMERICHOST; 1874 if (getaddrinfo(cp, NULL, &hints, &ai) == 0) 1875 sa = ai->ai_addr; 1876 if (sa != NULL && ai->ai_family == AF_INET) { 1877 /* 1878 * The address in `cp' is really a network address, so 1879 * use inet_network() to re-interpret this correctly. 1880 * e.g. "127.1" means 127.1.0.0, not 127.0.0.1. 1881 */ 1882 bzero(&sin, sizeof sin); 1883 sin.sin_family = AF_INET; 1884 sin.sin_len = sizeof sin; 1885 sin.sin_addr = inet_makeaddr(inet_network(cp), 0); 1886 if (debug) 1887 fprintf(stderr, "get_net: v4 addr %s\n", 1888 inet_ntoa(sin.sin_addr)); 1889 sa = (struct sockaddr *)&sin; 1890 } 1891 } 1892 if (sa == NULL && (np = getnetbyname(cp)) != NULL) { 1893 bzero(&sin, sizeof sin); 1894 sin.sin_family = AF_INET; 1895 sin.sin_len = sizeof sin; 1896 sin.sin_addr = inet_makeaddr(np->n_net, 0); 1897 sa = (struct sockaddr *)&sin; 1898 } 1899 if (sa == NULL) 1900 goto fail; 1901 1902 if (maskflg) { 1903 /* The specified sockaddr is a mask. */ 1904 if (checkmask(sa) != 0) 1905 goto fail; 1906 bcopy(sa, &net->nt_mask, sa->sa_len); 1907 opt_flags |= OP_HAVEMASK; 1908 } else { 1909 /* The specified sockaddr is a network address. */ 1910 bcopy(sa, &net->nt_net, sa->sa_len); 1911 1912 /* Get a network name for the export list. */ 1913 if (np) { 1914 name = np->n_name; 1915 } else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname, 1916 NULL, 0, ninumeric) == 0) { 1917 name = netname; 1918 } else { 1919 goto fail; 1920 } 1921 if ((net->nt_name = strdup(name)) == NULL) 1922 out_of_mem(); 1923 1924 /* 1925 * Extract a mask from either a "/<masklen>" suffix, or 1926 * from the class of an IPv4 address. 1927 */ 1928 if (opt_flags & OP_MASKLEN) { 1929 preflen = strtol(prefp, NULL, 10); 1930 if (preflen < 0L || preflen == LONG_MAX) 1931 goto fail; 1932 bcopy(sa, &net->nt_mask, sa->sa_len); 1933 if (makemask(&net->nt_mask, (int)preflen) != 0) 1934 goto fail; 1935 opt_flags |= OP_HAVEMASK; 1936 *p = '/'; 1937 } else if (sa->sa_family == AF_INET && 1938 (opt_flags & OP_MASK) == 0) { 1939 in_addr_t addr; 1940 1941 addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr; 1942 if (IN_CLASSA(addr)) 1943 preflen = 8; 1944 else if (IN_CLASSB(addr)) 1945 preflen = 16; 1946 else if (IN_CLASSC(addr)) 1947 preflen = 24; 1948 else if (IN_CLASSD(addr)) 1949 preflen = 28; 1950 else 1951 preflen = 32; /* XXX */ 1952 1953 bcopy(sa, &net->nt_mask, sa->sa_len); 1954 makemask(&net->nt_mask, (int)preflen); 1955 opt_flags |= OP_HAVEMASK; 1956 } 1957 } 1958 1959 if (ai) 1960 freeaddrinfo(ai); 1961 return 0; 1962 1963fail: 1964 if (ai) 1965 freeaddrinfo(ai); 1966 return 1; 1967} 1968 1969/* 1970 * Parse out the next white space separated field 1971 */ 1972void 1973nextfield(cp, endcp) 1974 char **cp; 1975 char **endcp; 1976{ 1977 char *p; 1978 1979 p = *cp; 1980 while (*p == ' ' || *p == '\t') 1981 p++; 1982 if (*p == '\n' || *p == '\0') 1983 *cp = *endcp = p; 1984 else { 1985 *cp = p++; 1986 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0') 1987 p++; 1988 *endcp = p; 1989 } 1990} 1991 1992/* 1993 * Get an exports file line. Skip over blank lines and handle line 1994 * continuations. 1995 */ 1996int 1997get_line() 1998{ 1999 char *p, *cp; 2000 int len; 2001 int totlen, cont_line; 2002 2003 /* 2004 * Loop around ignoring blank lines and getting all continuation lines. 2005 */ 2006 p = line; 2007 totlen = 0; 2008 do { 2009 if (fgets(p, LINESIZ - totlen, exp_file) == NULL) 2010 return (0); 2011 len = strlen(p); 2012 cp = p + len - 1; 2013 cont_line = 0; 2014 while (cp >= p && 2015 (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) { 2016 if (*cp == '\\') 2017 cont_line = 1; 2018 cp--; 2019 len--; 2020 } 2021 if (cont_line) { 2022 *++cp = ' '; 2023 len++; 2024 } 2025 *++cp = '\0'; 2026 if (len > 0) { 2027 totlen += len; 2028 if (totlen >= LINESIZ) { 2029 syslog(LOG_ERR, "exports line too long"); 2030 exit(2); 2031 } 2032 p = cp; 2033 } 2034 } while (totlen == 0 || cont_line); 2035 return (1); 2036} 2037 2038/* 2039 * Parse a description of a credential. 2040 */ 2041void 2042parsecred(namelist, cr) 2043 char *namelist; 2044 struct xucred *cr; 2045{ 2046 char *name; 2047 int cnt; 2048 char *names; 2049 struct passwd *pw; 2050 struct group *gr; 2051 int ngroups, groups[NGROUPS + 1]; 2052 2053 cr->cr_version = XUCRED_VERSION; 2054 /* 2055 * Set up the unprivileged user. 2056 */ 2057 cr->cr_uid = -2; 2058 cr->cr_groups[0] = -2; 2059 cr->cr_ngroups = 1; 2060 /* 2061 * Get the user's password table entry. 2062 */ 2063 names = strsep(&namelist, " \t\n"); 2064 name = strsep(&names, ":"); 2065 if (isdigit(*name) || *name == '-') 2066 pw = getpwuid(atoi(name)); 2067 else 2068 pw = getpwnam(name); 2069 /* 2070 * Credentials specified as those of a user. 2071 */ 2072 if (names == NULL) { 2073 if (pw == NULL) { 2074 syslog(LOG_ERR, "unknown user: %s", name); 2075 return; 2076 } 2077 cr->cr_uid = pw->pw_uid; 2078 ngroups = NGROUPS + 1; 2079 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups)) 2080 syslog(LOG_ERR, "too many groups"); 2081 /* 2082 * Convert from int's to gid_t's and compress out duplicate 2083 */ 2084 cr->cr_ngroups = ngroups - 1; 2085 cr->cr_groups[0] = groups[0]; 2086 for (cnt = 2; cnt < ngroups; cnt++) 2087 cr->cr_groups[cnt - 1] = groups[cnt]; 2088 return; 2089 } 2090 /* 2091 * Explicit credential specified as a colon separated list: 2092 * uid:gid:gid:... 2093 */ 2094 if (pw != NULL) 2095 cr->cr_uid = pw->pw_uid; 2096 else if (isdigit(*name) || *name == '-') 2097 cr->cr_uid = atoi(name); 2098 else { 2099 syslog(LOG_ERR, "unknown user: %s", name); 2100 return; 2101 } 2102 cr->cr_ngroups = 0; 2103 while (names != NULL && *names != '\0' && cr->cr_ngroups < NGROUPS) { 2104 name = strsep(&names, ":"); 2105 if (isdigit(*name) || *name == '-') { 2106 cr->cr_groups[cr->cr_ngroups++] = atoi(name); 2107 } else { 2108 if ((gr = getgrnam(name)) == NULL) { 2109 syslog(LOG_ERR, "unknown group: %s", name); 2110 continue; 2111 } 2112 cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid; 2113 } 2114 } 2115 if (names != NULL && *names != '\0' && cr->cr_ngroups == NGROUPS) 2116 syslog(LOG_ERR, "too many groups"); 2117} 2118 2119#define STRSIZ (RPCMNT_NAMELEN+RPCMNT_PATHLEN+50) 2120/* 2121 * Routines that maintain the remote mounttab 2122 */ 2123void 2124get_mountlist() 2125{ 2126 struct mountlist *mlp, **mlpp; 2127 char *host, *dirp, *cp; 2128 char str[STRSIZ]; 2129 FILE *mlfile; 2130 2131 if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) { 2132 if (errno == ENOENT) 2133 return; 2134 else { 2135 syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST); 2136 return; 2137 } 2138 } 2139 mlpp = &mlhead; 2140 while (fgets(str, STRSIZ, mlfile) != NULL) { 2141 cp = str; 2142 host = strsep(&cp, " \t\n"); 2143 dirp = strsep(&cp, " \t\n"); 2144 if (host == NULL || dirp == NULL) 2145 continue; 2146 mlp = (struct mountlist *)malloc(sizeof (*mlp)); 2147 if (mlp == (struct mountlist *)NULL) 2148 out_of_mem(); 2149 strncpy(mlp->ml_host, host, RPCMNT_NAMELEN); 2150 mlp->ml_host[RPCMNT_NAMELEN] = '\0'; 2151 strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN); 2152 mlp->ml_dirp[RPCMNT_PATHLEN] = '\0'; 2153 mlp->ml_next = (struct mountlist *)NULL; 2154 *mlpp = mlp; 2155 mlpp = &mlp->ml_next; 2156 } 2157 fclose(mlfile); 2158} 2159 2160void 2161del_mlist(char *hostp, char *dirp) 2162{ 2163 struct mountlist *mlp, **mlpp; 2164 struct mountlist *mlp2; 2165 FILE *mlfile; 2166 int fnd = 0; 2167 2168 mlpp = &mlhead; 2169 mlp = mlhead; 2170 while (mlp) { 2171 if (!strcmp(mlp->ml_host, hostp) && 2172 (!dirp || !strcmp(mlp->ml_dirp, dirp))) { 2173 fnd = 1; 2174 mlp2 = mlp; 2175 *mlpp = mlp = mlp->ml_next; 2176 free((caddr_t)mlp2); 2177 } else { 2178 mlpp = &mlp->ml_next; 2179 mlp = mlp->ml_next; 2180 } 2181 } 2182 if (fnd) { 2183 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) { 2184 syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST); 2185 return; 2186 } 2187 mlp = mlhead; 2188 while (mlp) { 2189 fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp); 2190 mlp = mlp->ml_next; 2191 } 2192 fclose(mlfile); 2193 } 2194} 2195 2196void 2197add_mlist(hostp, dirp) 2198 char *hostp, *dirp; 2199{ 2200 struct mountlist *mlp, **mlpp; 2201 FILE *mlfile; 2202 2203 mlpp = &mlhead; 2204 mlp = mlhead; 2205 while (mlp) { 2206 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp)) 2207 return; 2208 mlpp = &mlp->ml_next; 2209 mlp = mlp->ml_next; 2210 } 2211 mlp = (struct mountlist *)malloc(sizeof (*mlp)); 2212 if (mlp == (struct mountlist *)NULL) 2213 out_of_mem(); 2214 strncpy(mlp->ml_host, hostp, RPCMNT_NAMELEN); 2215 mlp->ml_host[RPCMNT_NAMELEN] = '\0'; 2216 strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN); 2217 mlp->ml_dirp[RPCMNT_PATHLEN] = '\0'; 2218 mlp->ml_next = (struct mountlist *)NULL; 2219 *mlpp = mlp; 2220 if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) { 2221 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST); 2222 return; 2223 } 2224 fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp); 2225 fclose(mlfile); 2226} 2227 2228/* 2229 * Free up a group list. 2230 */ 2231void 2232free_grp(grp) 2233 struct grouplist *grp; 2234{ 2235 if (grp->gr_type == GT_HOST) { 2236 if (grp->gr_ptr.gt_addrinfo != NULL) 2237 freeaddrinfo(grp->gr_ptr.gt_addrinfo); 2238 } else if (grp->gr_type == GT_NET) { 2239 if (grp->gr_ptr.gt_net.nt_name) 2240 free(grp->gr_ptr.gt_net.nt_name); 2241 } 2242 free((caddr_t)grp); 2243} 2244 2245#ifdef DEBUG 2246void 2247SYSLOG(int pri, const char *fmt, ...) 2248{ 2249 va_list ap; 2250 2251 va_start(ap, fmt); 2252 vfprintf(stderr, fmt, ap); 2253 va_end(ap); 2254} 2255#endif /* DEBUG */ 2256 2257/* 2258 * Check options for consistency. 2259 */ 2260int 2261check_options(dp) 2262 struct dirlist *dp; 2263{ 2264 2265 if (dp == (struct dirlist *)NULL) 2266 return (1); 2267 if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL)) { 2268 syslog(LOG_ERR, "-mapall and -maproot mutually exclusive"); 2269 return (1); 2270 } 2271 if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) { 2272 syslog(LOG_ERR, "-mask requires -network"); 2273 return (1); 2274 } 2275 if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) { 2276 syslog(LOG_ERR, "-network requires mask specification"); 2277 return (1); 2278 } 2279 if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) { 2280 syslog(LOG_ERR, "-mask and /masklen are mutually exclusive"); 2281 return (1); 2282 } 2283 if ((opt_flags & OP_ALLDIRS) && dp->dp_left) { 2284 syslog(LOG_ERR, "-alldirs has multiple directories"); 2285 return (1); 2286 } 2287 return (0); 2288} 2289 2290/* 2291 * Check an absolute directory path for any symbolic links. Return true 2292 */ 2293int 2294check_dirpath(dirp) 2295 char *dirp; 2296{ 2297 char *cp; 2298 int ret = 1; 2299 struct stat sb; 2300 2301 cp = dirp + 1; 2302 while (*cp && ret) { 2303 if (*cp == '/') { 2304 *cp = '\0'; 2305 if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode)) 2306 ret = 0; 2307 *cp = '/'; 2308 } 2309 cp++; 2310 } 2311 if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode)) 2312 ret = 0; 2313 return (ret); 2314} 2315 2316/* 2317 * Make a netmask according to the specified prefix length. The ss_family 2318 * and other non-address fields must be initialised before calling this. 2319 */ 2320int 2321makemask(struct sockaddr_storage *ssp, int bitlen) 2322{ 2323 u_char *p; 2324 int bits, i, len; 2325 2326 if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL) 2327 return (-1); 2328 if (bitlen > len * NBBY) 2329 return (-1); 2330 2331 for (i = 0; i < len; i++) { 2332 bits = (bitlen > NBBY) ? NBBY : bitlen; 2333 *p++ = (1 << bits) - 1; 2334 bitlen -= bits; 2335 } 2336 return 0; 2337} 2338 2339/* 2340 * Check that the sockaddr is a valid netmask. Returns 0 if the mask 2341 * is acceptable (i.e. of the form 1...10....0). 2342 */ 2343int 2344checkmask(struct sockaddr *sa) 2345{ 2346 u_char *mask; 2347 int i, len; 2348 2349 if ((mask = sa_rawaddr(sa, &len)) == NULL) 2350 return (-1); 2351 2352 for (i = 0; i < len; i++) 2353 if (mask[i] != 0xff) 2354 break; 2355 if (i < len) { 2356 if (~mask[i] & (u_char)(~mask[i] + 1)) 2357 return (-1); 2358 i++; 2359 } 2360 for (; i < len; i++) 2361 if (mask[i] != 0) 2362 return (-1); 2363 return (0); 2364} 2365 2366/* 2367 * Compare two sockaddrs according to a specified mask. Return zero if 2368 * `sa1' matches `sa2' when filtered by the netmask in `samask'. 2369 * If samask is NULL, perform a full comparision. 2370 */ 2371int 2372sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask) 2373{ 2374 unsigned char *p1, *p2, *mask; 2375 int len, i; 2376 2377 if (sa1->sa_family != sa2->sa_family || 2378 (p1 = sa_rawaddr(sa1, &len)) == NULL || 2379 (p2 = sa_rawaddr(sa2, NULL)) == NULL) 2380 return (1); 2381 2382 switch (sa1->sa_family) { 2383 case AF_INET6: 2384 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id != 2385 ((struct sockaddr_in6 *)sa2)->sin6_scope_id) 2386 return (1); 2387 break; 2388 } 2389 2390 /* Simple binary comparison if no mask specified. */ 2391 if (samask == NULL) 2392 return (memcmp(p1, p2, len)); 2393 2394 /* Set up the mask, and do a mask-based comparison. */ 2395 if (sa1->sa_family != samask->sa_family || 2396 (mask = sa_rawaddr(samask, NULL)) == NULL) 2397 return (1); 2398 2399 for (i = 0; i < len; i++) 2400 if ((p1[i] & mask[i]) != (p2[i] & mask[i])) 2401 return (1); 2402 return (0); 2403} 2404 2405/* 2406 * Return a pointer to the part of the sockaddr that contains the 2407 * raw address, and set *nbytes to its length in bytes. Returns 2408 * NULL if the address family is unknown. 2409 */ 2410void * 2411sa_rawaddr(struct sockaddr *sa, int *nbytes) { 2412 void *p; 2413 int len; 2414 2415 switch (sa->sa_family) { 2416 case AF_INET: 2417 len = sizeof(((struct sockaddr_in *)sa)->sin_addr); 2418 p = &((struct sockaddr_in *)sa)->sin_addr; 2419 break; 2420 case AF_INET6: 2421 len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr); 2422 p = &((struct sockaddr_in6 *)sa)->sin6_addr; 2423 break; 2424 default: 2425 p = NULL; 2426 len = 0; 2427 } 2428 2429 if (nbytes != NULL) 2430 *nbytes = len; 2431 return (p); 2432} 2433 2434void 2435huphandler(int sig) 2436{ 2437 got_sighup = 1; 2438} 2439 2440void terminate(sig) 2441int sig; 2442{ 2443 close(mountdlockfd); 2444 unlink(MOUNTDLOCK); 2445 rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL); 2446 rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL); 2447 exit (0); 2448} 2449