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: src/sbin/mountd/mountd.c,v 1.39.2.5 2002/09/13 15:57:43 joerg Exp $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/mount.h> 39 #include <sys/mountctl.h> 40 #include <sys/fcntl.h> 41 #include <sys/stat.h> 42 #include <sys/syslog.h> 43 #include <sys/sysctl.h> 44 45 #include <rpc/rpc.h> 46 #include <rpc/pmap_clnt.h> 47 #include <rpc/pmap_prot.h> 48 #include <rpcsvc/mount.h> 49 #include <vfs/nfs/rpcv2.h> 50 #include <vfs/nfs/nfsproto.h> 51 #include <vfs/nfs/nfs.h> 52 #include <vfs/ufs/ufsmount.h> 53 #include <vfs/msdosfs/msdosfsmount.h> 54 #include <vfs/ntfs/ntfsmount.h> 55 #include <vfs/isofs/cd9660/cd9660_mount.h> /* XXX need isofs in include */ 56 57 #include <arpa/inet.h> 58 59 #include <ctype.h> 60 #include <err.h> 61 #include <errno.h> 62 #include <grp.h> 63 #include <libutil.h> 64 #include <netdb.h> 65 #include <pwd.h> 66 #include <signal.h> 67 #include <stdio.h> 68 #include <stdlib.h> 69 #include <string.h> 70 #include <unistd.h> 71 #include "pathnames.h" 72 73 #ifdef DEBUG 74 #include <stdarg.h> 75 #endif 76 77 /* 78 * Structures for keeping the mount list and export list 79 */ 80 struct mountlist { 81 struct mountlist *ml_next; 82 char ml_host[RPCMNT_NAMELEN+1]; 83 char ml_dirp[RPCMNT_PATHLEN+1]; 84 }; 85 86 struct dirlist { 87 struct dirlist *dp_left; 88 struct dirlist *dp_right; 89 int dp_flag; 90 struct hostlist *dp_hosts; /* List of hosts this dir exported to */ 91 char dp_dirp[1]; /* Actually malloc'd to size of dir */ 92 }; 93 /* dp_flag bits */ 94 #define DP_DEFSET 0x1 95 #define DP_HOSTSET 0x2 96 #define DP_KERB 0x4 97 98 struct exportlist { 99 struct exportlist *ex_next; 100 struct dirlist *ex_dirl; 101 struct dirlist *ex_defdir; 102 int ex_flag; 103 fsid_t ex_fs; 104 char *ex_fsdir; 105 char *ex_indexfile; 106 }; 107 /* ex_flag bits */ 108 #define EX_LINKED 0x1 109 110 struct netmsk { 111 struct sockaddr_storage nt_net; 112 struct sockaddr_storage nt_mask; 113 char *nt_name; 114 }; 115 116 union grouptypes { 117 struct addrinfo *gt_addrinfo; 118 struct netmsk gt_net; 119 }; 120 121 struct grouplist { 122 int gr_type; 123 union grouptypes gr_ptr; 124 struct grouplist *gr_next; 125 }; 126 /* Group types */ 127 #define GT_NULL 0x0 128 #define GT_HOST 0x1 129 #define GT_NET 0x2 130 #define GT_DEFAULT 0x3 131 #define GT_IGNORE 0x5 132 133 struct hostlist { 134 int ht_flag; /* Uses DP_xx bits */ 135 struct grouplist *ht_grp; 136 struct hostlist *ht_next; 137 }; 138 139 struct fhreturn { 140 int fhr_flag; 141 int fhr_vers; 142 nfsfh_t fhr_fh; 143 }; 144 145 /* Global defs */ 146 char *add_expdir(struct dirlist **, char *, int); 147 void add_dlist(struct dirlist **, struct dirlist *, 148 struct grouplist *, int); 149 void add_mlist(char *, char *); 150 int check_dirpath(char *); 151 int check_options(struct dirlist *); 152 int checkmask(struct sockaddr *sa); 153 int chk_host(struct dirlist *, struct sockaddr *, int *, int *); 154 void del_mlist(char *, char *); 155 struct dirlist *dirp_search(struct dirlist *, char *); 156 int do_mount(struct exportlist *, struct grouplist *, int, 157 struct ucred *, char *, int, struct statfs *); 158 int do_opt(char **, char **, struct exportlist *, struct grouplist *, 159 int *, int *, struct ucred *); 160 struct exportlist *ex_search(fsid_t *); 161 struct exportlist *get_exp(void); 162 void free_dir(struct dirlist *); 163 void free_exp(struct exportlist *); 164 void free_grp(struct grouplist *); 165 void free_host(struct hostlist *); 166 void get_exportlist(void); 167 int get_host(char *, struct grouplist *, struct grouplist *); 168 struct hostlist *get_ht(void); 169 int get_line(void); 170 void get_mountlist(void); 171 int get_net(char *, struct netmsk *, int); 172 void getexp_err(struct exportlist *, struct grouplist *); 173 struct grouplist *get_grp(void); 174 void hang_dirp(struct dirlist *, struct grouplist *, 175 struct exportlist *, int); 176 void huphandler(int sig); 177 int makemask(struct sockaddr_storage *ssp, int bitlen); 178 void mntsrv(struct svc_req *, SVCXPRT *); 179 void nextfield(char **, char **); 180 void out_of_mem(void); 181 void parsecred(char *, struct ucred *); 182 int put_exlist(struct dirlist *, XDR *, struct dirlist *, int *); 183 void *sa_rawaddr(struct sockaddr *sa, int *nbytes); 184 int sacmp(struct sockaddr *sa1, struct sockaddr *sa2, 185 struct sockaddr *samask); 186 int scan_tree(struct dirlist *, struct sockaddr *); 187 static void usage(void); 188 int xdr_dir(XDR *, char *); 189 int xdr_explist(XDR *, caddr_t); 190 int xdr_fhs(XDR *, caddr_t); 191 int xdr_mlist(XDR *, caddr_t); 192 void terminate(int); 193 194 struct exportlist *exphead; 195 struct mountlist *mlhead; 196 struct grouplist *grphead; 197 char exname[MAXPATHLEN]; 198 struct ucred def_anon = { 199 1, 200 (uid_t) -2, 201 1, 202 { (gid_t) -2 } 203 }; 204 int force_v2 = 0; 205 int resvport_only = 1; 206 int dir_only = 1; 207 int do_log = 0; 208 int got_sighup = 0; 209 210 int opt_flags; 211 static int have_v6 = 1; 212 #ifdef NI_WITHSCOPEID 213 static const int ninumeric = NI_NUMERICHOST | NI_WITHSCOPEID; 214 #else 215 static const int ninumeric = NI_NUMERICHOST; 216 #endif 217 218 struct pidfh *pfh = NULL; 219 /* Bits for the opt_flags above */ 220 #define OP_MAPROOT 0x01 221 #define OP_MAPALL 0x02 222 #define OP_KERB 0x04 223 #define OP_MASK 0x08 224 #define OP_NET 0x10 225 #define OP_ALLDIRS 0x40 226 #define OP_HAVEMASK 0x80 /* A mask was specified or inferred. */ 227 #define OP_QUIET 0x100 228 #define OP_MASKLEN 0x200 229 230 #ifdef DEBUG 231 int debug = 1; 232 void SYSLOG(int, const char *, ...); 233 #define syslog SYSLOG 234 #else 235 int debug = 0; 236 #endif 237 238 /* 239 * Mountd server for NFS mount protocol as described in: 240 * NFS: Network File System Protocol Specification, RFC1094, Appendix A 241 * The optional arguments are the exports file name 242 * default: _PATH_EXPORTS 243 * and "-n" to allow nonroot mount. 244 */ 245 int 246 main(int argc, char **argv) 247 { 248 fd_set readfds; 249 SVCXPRT *udptransp, *tcptransp, *udp6transp, *tcp6transp; 250 struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf; 251 pid_t otherpid; 252 int udpsock, tcpsock, udp6sock, tcp6sock; 253 int xcreated = 0, s; 254 int one = 1; 255 int c, error, mib[3]; 256 struct vfsconf vfc; 257 258 udp6conf = tcp6conf = NULL; 259 udp6sock = tcp6sock = 0; 260 261 /* Check that another mountd isn't already running. */ 262 pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &otherpid); 263 if (pfh == NULL) { 264 if (errno == EEXIST) 265 errx(1, "mountd already running, pid: %d.", otherpid); 266 warn("cannot open or create pidfile"); 267 } 268 269 s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP); 270 if (s < 0) 271 have_v6 = 0; 272 else 273 close(s); 274 error = getvfsbyname("nfs", &vfc); 275 if (error && vfsisloadable("nfs")) { 276 if(vfsload("nfs")) 277 err(1, "vfsload(nfs)"); 278 endvfsent(); /* flush cache */ 279 error = getvfsbyname("nfs", &vfc); 280 } 281 if (error) 282 errx(1, "NFS support is not available in the running kernel"); 283 284 while ((c = getopt(argc, argv, "2dlnr")) != -1) { 285 switch (c) { 286 case '2': 287 force_v2 = 1; 288 break; 289 case 'n': 290 resvport_only = 0; 291 break; 292 case 'r': 293 dir_only = 0; 294 break; 295 case 'd': 296 debug = debug ? 0 : 1; 297 break; 298 case 'l': 299 do_log = 1; 300 break; 301 default: 302 usage(); 303 } 304 } 305 if (debug == 0) { 306 daemon(0, 0); 307 signal(SIGINT, SIG_IGN); 308 signal(SIGQUIT, SIG_IGN); 309 } 310 argc -= optind; 311 argv += optind; 312 grphead = NULL; 313 exphead = NULL; 314 mlhead = NULL; 315 if (argc == 1) { 316 strncpy(exname, *argv, MAXPATHLEN-1); 317 exname[MAXPATHLEN-1] = '\0'; 318 } else 319 strcpy(exname, _PATH_EXPORTS); 320 openlog("mountd", LOG_PID, LOG_DAEMON); 321 if (debug) 322 warnx("getting export list"); 323 get_exportlist(); 324 if (debug) 325 warnx("getting mount list"); 326 get_mountlist(); 327 if (debug) 328 warnx("here we go"); 329 signal(SIGHUP, huphandler); 330 signal(SIGTERM, terminate); 331 332 pidfile_write(pfh); 333 334 rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL); 335 rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL); 336 udpsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); 337 tcpsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); 338 udpconf = getnetconfigent("udp"); 339 tcpconf = getnetconfigent("tcp"); 340 if (!have_v6) 341 goto skip_v6; 342 udp6sock = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP); 343 tcp6sock = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP); 344 /* 345 * We're doing host-based access checks here, so don't allow 346 * v4-in-v6 to confuse things. The kernel will disable it 347 * by default on NFS sockets too. 348 */ 349 if (udp6sock != -1 && setsockopt(udp6sock, IPPROTO_IPV6, 350 IPV6_BINDV6ONLY, &one, sizeof one) < 0){ 351 syslog(LOG_ERR, "can't disable v4-in-v6 on UDP socket"); 352 exit(1); 353 } 354 if (tcp6sock != -1 && setsockopt(tcp6sock, IPPROTO_IPV6, 355 IPV6_BINDV6ONLY, &one, sizeof one) < 0){ 356 syslog(LOG_ERR, "can't disable v4-in-v6 on UDP socket"); 357 exit(1); 358 } 359 udp6conf = getnetconfigent("udp6"); 360 tcp6conf = getnetconfigent("tcp6"); 361 362 skip_v6: 363 if (!resvport_only) { 364 mib[0] = CTL_VFS; 365 mib[1] = vfc.vfc_typenum; 366 mib[2] = NFS_NFSPRIVPORT; 367 if (sysctl(mib, 3, NULL, NULL, &resvport_only, 368 sizeof(resvport_only)) != 0 && errno != ENOENT) { 369 syslog(LOG_ERR, "sysctl: %m"); 370 exit(1); 371 } 372 } 373 if ((udptransp = svcudp_create(RPC_ANYSOCK)) == NULL || 374 (tcptransp = svctcp_create(RPC_ANYSOCK, 0, 0)) == NULL) { 375 syslog(LOG_ERR, "can't create socket"); 376 exit(1); 377 } 378 if (udpsock != -1 && udpconf != NULL) { 379 bindresvport(udpsock, NULL); 380 udptransp = svc_dg_create(udpsock, 0, 0); 381 if (udptransp != NULL) { 382 if (!svc_reg(udptransp, RPCPROG_MNT, RPCMNT_VER1, 383 mntsrv, udpconf)) 384 syslog(LOG_WARNING, "can't register UDP RPCMNT_VER1 service"); 385 else 386 xcreated++; 387 if (!force_v2) { 388 if (!svc_reg(udptransp, RPCPROG_MNT, RPCMNT_VER3, 389 mntsrv, udpconf)) 390 syslog(LOG_WARNING, "can't register UDP RPCMNT_VER3 service"); 391 else 392 xcreated++; 393 } 394 } else 395 syslog(LOG_WARNING, "can't create UDP services"); 396 397 } 398 if (tcpsock != -1 && tcpconf != NULL) { 399 bindresvport(tcpsock, NULL); 400 listen(tcpsock, SOMAXCONN); 401 tcptransp = svc_vc_create(tcpsock, 0, 0); 402 if (tcptransp != NULL) { 403 if (!svc_reg(tcptransp, RPCPROG_MNT, RPCMNT_VER1, 404 mntsrv, tcpconf)) 405 syslog(LOG_WARNING, "can't register TCP RPCMNT_VER1 service"); 406 else 407 xcreated++; 408 if (!force_v2) { 409 if (!svc_reg(tcptransp, RPCPROG_MNT, RPCMNT_VER3, 410 mntsrv, tcpconf)) 411 syslog(LOG_WARNING, "can't register TCP RPCMNT_VER3 service"); 412 else 413 xcreated++; 414 } 415 } else 416 syslog(LOG_WARNING, "can't create TCP service"); 417 418 } 419 if (have_v6 && udp6sock != -1 && udp6conf != NULL) { 420 bindresvport(udp6sock, NULL); 421 udp6transp = svc_dg_create(udp6sock, 0, 0); 422 if (udp6transp != NULL) { 423 if (!svc_reg(udp6transp, RPCPROG_MNT, RPCMNT_VER1, 424 mntsrv, udp6conf)) 425 syslog(LOG_WARNING, "can't register UDP6 RPCMNT_VER1 service"); 426 else 427 xcreated++; 428 if (!force_v2) { 429 if (!svc_reg(udp6transp, RPCPROG_MNT, RPCMNT_VER3, 430 mntsrv, udp6conf)) 431 syslog(LOG_WARNING, "can't register UDP6 RPCMNT_VER3 service"); 432 else 433 xcreated++; 434 } 435 } else 436 syslog(LOG_WARNING, "can't create UDP6 service"); 437 438 } 439 if (have_v6 && tcp6sock != -1 && tcp6conf != NULL) { 440 bindresvport(tcp6sock, NULL); 441 listen(tcp6sock, SOMAXCONN); 442 tcp6transp = svc_vc_create(tcp6sock, 0, 0); 443 if (tcp6transp != NULL) { 444 if (!svc_reg(tcp6transp, RPCPROG_MNT, RPCMNT_VER1, 445 mntsrv, tcp6conf)) 446 syslog(LOG_WARNING, "can't register TCP6 RPCMNT_VER1 service"); 447 else 448 xcreated++; 449 if (!force_v2) { 450 if (!svc_reg(tcp6transp, RPCPROG_MNT, RPCMNT_VER3, 451 mntsrv, tcp6conf)) 452 syslog(LOG_WARNING, "can't register TCP6 RPCMNT_VER3 service"); 453 else 454 xcreated++; 455 } 456 } else 457 syslog(LOG_WARNING, "can't create TCP6 service"); 458 459 } 460 if (xcreated == 0) { 461 syslog(LOG_ERR, "could not create any services"); 462 exit(1); 463 } 464 465 /* Expand svc_run() here so that we can call get_exportlist(). */ 466 for (;;) { 467 if (got_sighup) { 468 get_exportlist(); 469 got_sighup = 0; 470 } 471 readfds = svc_fdset; 472 switch (select(svc_maxfd + 1, &readfds, NULL, NULL, NULL)) { 473 case -1: 474 if (errno == EINTR) 475 continue; 476 syslog(LOG_ERR, "mountd died: select: %m"); 477 exit(1); 478 case 0: 479 continue; 480 default: 481 svc_getreqset(&readfds); 482 } 483 } 484 } 485 486 static void 487 usage(void) 488 { 489 fprintf(stderr, 490 "usage: mountd [-2] [-d] [-l] [-n] [-r] [export_file]\n"); 491 exit(1); 492 } 493 494 /* 495 * The mount rpc service 496 */ 497 void 498 mntsrv(struct svc_req *rqstp, SVCXPRT *transp) 499 { 500 struct exportlist *ep; 501 struct dirlist *dp; 502 struct fhreturn fhr; 503 struct stat stb; 504 struct statfs fsb; 505 char host[NI_MAXHOST], numerichost[NI_MAXHOST]; 506 int lookup_failed = 1; 507 struct sockaddr *saddr; 508 u_short sport; 509 char rpcpath[RPCMNT_PATHLEN + 1], dirpath[MAXPATHLEN]; 510 int bad = 0, defset, hostset; 511 sigset_t sighup_mask; 512 513 sigemptyset(&sighup_mask); 514 sigaddset(&sighup_mask, SIGHUP); 515 saddr = svc_getrpccaller(transp)->buf; 516 switch (saddr->sa_family) { 517 case AF_INET6: 518 sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port); 519 break; 520 case AF_INET: 521 sport = ntohs(((struct sockaddr_in *)saddr)->sin_port); 522 break; 523 default: 524 syslog(LOG_ERR, "request from unknown address family"); 525 return; 526 } 527 lookup_failed = getnameinfo(saddr, saddr->sa_len, host, sizeof host, 528 NULL, 0, 0); 529 getnameinfo(saddr, saddr->sa_len, numerichost, 530 sizeof numerichost, NULL, 0, NI_NUMERICHOST); 531 switch (rqstp->rq_proc) { 532 case NULLPROC: 533 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL)) 534 syslog(LOG_ERR, "can't send reply"); 535 return; 536 case RPCMNT_MOUNT: 537 if (sport >= IPPORT_RESERVED && resvport_only) { 538 syslog(LOG_NOTICE, 539 "mount request from %s from unprivileged port", 540 numerichost); 541 svcerr_weakauth(transp); 542 return; 543 } 544 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) { 545 syslog(LOG_NOTICE, "undecodable mount request from %s", 546 numerichost); 547 svcerr_decode(transp); 548 return; 549 } 550 551 /* 552 * Get the real pathname and make sure it is a directory 553 * or a regular file if the -r option was specified 554 * and it exists. 555 */ 556 if (realpath(rpcpath, dirpath) == NULL || 557 stat(dirpath, &stb) < 0 || 558 (!S_ISDIR(stb.st_mode) && 559 (dir_only || !S_ISREG(stb.st_mode))) || 560 statfs(dirpath, &fsb) < 0) { 561 chdir("/"); /* Just in case realpath doesn't */ 562 syslog(LOG_NOTICE, 563 "mount request from %s for non existent path %s", 564 numerichost, dirpath); 565 if (debug) 566 warnx("stat failed on %s", dirpath); 567 bad = ENOENT; /* We will send error reply later */ 568 } 569 570 /* Check in the exports list */ 571 sigprocmask(SIG_BLOCK, &sighup_mask, NULL); 572 ep = ex_search(&fsb.f_fsid); 573 hostset = defset = 0; 574 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset) || 575 ((dp = dirp_search(ep->ex_dirl, dirpath)) && 576 chk_host(dp, saddr, &defset, &hostset)) || 577 (defset && scan_tree(ep->ex_defdir, saddr) == 0 && 578 scan_tree(ep->ex_dirl, saddr) == 0))) { 579 if (bad) { 580 if (!svc_sendreply(transp, (xdrproc_t)xdr_long, 581 &bad)) 582 syslog(LOG_ERR, "can't send reply"); 583 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 584 return; 585 } 586 if (hostset & DP_HOSTSET) 587 fhr.fhr_flag = hostset; 588 else 589 fhr.fhr_flag = defset; 590 fhr.fhr_vers = rqstp->rq_vers; 591 /* Get the file handle */ 592 memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t)); 593 if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) { 594 bad = errno; 595 syslog(LOG_ERR, "can't get fh for %s", dirpath); 596 if (!svc_sendreply(transp, (xdrproc_t)xdr_long, 597 &bad)) 598 syslog(LOG_ERR, "can't send reply"); 599 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 600 return; 601 } 602 if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs, &fhr)) 603 syslog(LOG_ERR, "can't send reply"); 604 if (!lookup_failed) 605 add_mlist(host, dirpath); 606 else 607 add_mlist(numerichost, dirpath); 608 if (debug) 609 warnx("mount successful"); 610 if (do_log) 611 syslog(LOG_NOTICE, 612 "mount request succeeded from %s for %s", 613 numerichost, dirpath); 614 } else { 615 bad = EACCES; 616 syslog(LOG_NOTICE, 617 "mount request denied from %s for %s", 618 numerichost, dirpath); 619 } 620 621 if (bad && !svc_sendreply(transp, (xdrproc_t)xdr_long, &bad)) 622 syslog(LOG_ERR, "can't send reply"); 623 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 624 return; 625 case RPCMNT_DUMP: 626 if (!svc_sendreply(transp, (xdrproc_t)xdr_mlist, NULL)) 627 syslog(LOG_ERR, "can't send reply"); 628 else if (do_log) 629 syslog(LOG_NOTICE, 630 "dump request succeeded from %s", 631 numerichost); 632 return; 633 case RPCMNT_UMOUNT: 634 if (sport >= IPPORT_RESERVED && resvport_only) { 635 syslog(LOG_NOTICE, 636 "umount request from %s from unprivileged port", 637 numerichost); 638 svcerr_weakauth(transp); 639 return; 640 } 641 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) { 642 syslog(LOG_NOTICE, "undecodable umount request from %s", 643 numerichost); 644 svcerr_decode(transp); 645 return; 646 } 647 if (realpath(rpcpath, dirpath) == NULL) { 648 syslog(LOG_NOTICE, "umount request from %s " 649 "for non existent path %s", 650 numerichost, dirpath); 651 } 652 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL)) 653 syslog(LOG_ERR, "can't send reply"); 654 if (!lookup_failed) 655 del_mlist(host, dirpath); 656 del_mlist(numerichost, dirpath); 657 if (do_log) 658 syslog(LOG_NOTICE, 659 "umount request succeeded from %s for %s", 660 numerichost, dirpath); 661 return; 662 case RPCMNT_UMNTALL: 663 if (sport >= IPPORT_RESERVED && resvport_only) { 664 syslog(LOG_NOTICE, 665 "umountall request from %s from unprivileged port", 666 numerichost); 667 svcerr_weakauth(transp); 668 return; 669 } 670 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL)) 671 syslog(LOG_ERR, "can't send reply"); 672 if (!lookup_failed) 673 del_mlist(host, NULL); 674 del_mlist(numerichost, NULL); 675 if (do_log) 676 syslog(LOG_NOTICE, 677 "umountall request succeeded from %s", 678 numerichost); 679 return; 680 case RPCMNT_EXPORT: 681 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, NULL)) 682 syslog(LOG_ERR, "can't send reply"); 683 if (do_log) 684 syslog(LOG_NOTICE, 685 "export request succeeded from %s", 686 numerichost); 687 return; 688 default: 689 svcerr_noproc(transp); 690 return; 691 } 692 } 693 694 /* 695 * Xdr conversion for a dirpath string 696 */ 697 int 698 xdr_dir(XDR *xdrsp, char *dirp) 699 { 700 return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN)); 701 } 702 703 /* 704 * Xdr routine to generate file handle reply 705 */ 706 int 707 xdr_fhs(XDR *xdrsp, caddr_t cp) 708 { 709 struct fhreturn *fhrp = (struct fhreturn *)cp; 710 u_long ok = 0, len, auth; 711 712 if (!xdr_long(xdrsp, &ok)) 713 return (0); 714 switch (fhrp->fhr_vers) { 715 case 1: 716 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH)); 717 case 3: 718 len = NFSX_V3FH; 719 if (!xdr_long(xdrsp, &len)) 720 return (0); 721 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len)) 722 return (0); 723 if (fhrp->fhr_flag & DP_KERB) 724 auth = RPCAUTH_KERB4; 725 else 726 auth = RPCAUTH_UNIX; 727 len = 1; 728 if (!xdr_long(xdrsp, &len)) 729 return (0); 730 return (xdr_long(xdrsp, &auth)); 731 } 732 return (0); 733 } 734 735 int 736 xdr_mlist(XDR *xdrsp, caddr_t cp) 737 { 738 struct mountlist *mlp; 739 int true = 1; 740 int false = 0; 741 char *strp; 742 743 mlp = mlhead; 744 while (mlp) { 745 if (!xdr_bool(xdrsp, &true)) 746 return (0); 747 strp = &mlp->ml_host[0]; 748 if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN)) 749 return (0); 750 strp = &mlp->ml_dirp[0]; 751 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN)) 752 return (0); 753 mlp = mlp->ml_next; 754 } 755 if (!xdr_bool(xdrsp, &false)) 756 return (0); 757 return (1); 758 } 759 760 /* 761 * Xdr conversion for export list 762 */ 763 int 764 xdr_explist(XDR *xdrsp, caddr_t cp) 765 { 766 struct exportlist *ep; 767 int false = 0; 768 int putdef; 769 sigset_t sighup_mask; 770 771 sigemptyset(&sighup_mask); 772 sigaddset(&sighup_mask, SIGHUP); 773 sigprocmask(SIG_BLOCK, &sighup_mask, NULL); 774 ep = exphead; 775 while (ep) { 776 putdef = 0; 777 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir, &putdef)) 778 goto errout; 779 if (ep->ex_defdir && putdef == 0 && 780 put_exlist(ep->ex_defdir, xdrsp, NULL, 781 &putdef)) 782 goto errout; 783 ep = ep->ex_next; 784 } 785 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 786 if (!xdr_bool(xdrsp, &false)) 787 return (0); 788 return (1); 789 errout: 790 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 791 return (0); 792 } 793 794 /* 795 * Called from xdr_explist() to traverse the tree and export the 796 * directory paths. 797 */ 798 int 799 put_exlist(struct dirlist *dp, XDR *xdrsp, struct dirlist *adp, int *putdefp) 800 { 801 struct grouplist *grp; 802 struct hostlist *hp; 803 int true = 1; 804 int false = 0; 805 int gotalldir = 0; 806 char *strp; 807 808 if (dp) { 809 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp)) 810 return (1); 811 if (!xdr_bool(xdrsp, &true)) 812 return (1); 813 strp = dp->dp_dirp; 814 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN)) 815 return (1); 816 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) { 817 gotalldir = 1; 818 *putdefp = 1; 819 } 820 if ((dp->dp_flag & DP_DEFSET) == 0 && 821 (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) { 822 hp = dp->dp_hosts; 823 while (hp) { 824 grp = hp->ht_grp; 825 if (grp->gr_type == GT_HOST) { 826 if (!xdr_bool(xdrsp, &true)) 827 return (1); 828 strp = grp->gr_ptr.gt_addrinfo->ai_canonname; 829 if (!xdr_string(xdrsp, &strp, 830 RPCMNT_NAMELEN)) 831 return (1); 832 } else if (grp->gr_type == GT_NET) { 833 if (!xdr_bool(xdrsp, &true)) 834 return (1); 835 strp = grp->gr_ptr.gt_net.nt_name; 836 if (!xdr_string(xdrsp, &strp, 837 RPCMNT_NAMELEN)) 838 return (1); 839 } 840 hp = hp->ht_next; 841 if (gotalldir && hp == NULL) { 842 hp = adp->dp_hosts; 843 gotalldir = 0; 844 } 845 } 846 } 847 if (!xdr_bool(xdrsp, &false)) 848 return (1); 849 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp)) 850 return (1); 851 } 852 return (0); 853 } 854 855 #define LINESIZ 10240 856 char line[LINESIZ]; 857 FILE *exp_file; 858 859 /* 860 * Get the export list 861 */ 862 void 863 get_exportlist(void) 864 { 865 struct exportlist *ep, *ep2; 866 struct grouplist *grp, *tgrp; 867 struct exportlist **epp; 868 struct dirlist *dirhead; 869 struct statfs fsb, *fsp; 870 struct ucred anon; 871 char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc; 872 int len, has_host, exflags, got_nondir, dirplen, num, i, netgrp; 873 874 dirp = NULL; 875 dirplen = 0; 876 877 /* 878 * First, get rid of the old list 879 */ 880 ep = exphead; 881 while (ep) { 882 ep2 = ep; 883 ep = ep->ex_next; 884 free_exp(ep2); 885 } 886 exphead = NULL; 887 888 grp = grphead; 889 while (grp) { 890 tgrp = grp; 891 grp = grp->gr_next; 892 free_grp(tgrp); 893 } 894 grphead = NULL; 895 896 /* 897 * And delete exports that are in the kernel for all local 898 * file systems. 899 * XXX: Should know how to handle all local exportable file systems 900 * instead of just "ufs". 901 */ 902 num = getmntinfo(&fsp, MNT_NOWAIT); 903 for (i = 0; i < num; i++) { 904 union { 905 struct ufs_args ua; 906 struct iso_args ia; 907 struct mfs_args ma; 908 struct msdosfs_args da; 909 struct ntfs_args na; 910 } targs; 911 struct export_args export; 912 913 export.ex_flags = MNT_DELEXPORT; 914 if (mountctl(fsp->f_mntonname, MOUNTCTL_SET_EXPORT, -1, 915 &export, sizeof(export), NULL, 0) == 0) { 916 } else if (!strcmp(fsp->f_fstypename, "mfs") || 917 !strcmp(fsp->f_fstypename, "ufs") || 918 !strcmp(fsp->f_fstypename, "msdos") || 919 !strcmp(fsp->f_fstypename, "ntfs") || 920 !strcmp(fsp->f_fstypename, "cd9660")) { 921 targs.ua.fspec = NULL; 922 targs.ua.export.ex_flags = MNT_DELEXPORT; 923 if (mount(fsp->f_fstypename, fsp->f_mntonname, 924 fsp->f_flags | MNT_UPDATE, 925 (caddr_t)&targs) < 0) 926 syslog(LOG_ERR, "can't delete exports for %s", 927 fsp->f_mntonname); 928 } 929 fsp++; 930 } 931 932 /* 933 * Read in the exports file and build the list, calling 934 * mount() as we go along to push the export rules into the kernel. 935 */ 936 if ((exp_file = fopen(exname, "r")) == NULL) { 937 syslog(LOG_ERR, "can't open %s", exname); 938 exit(2); 939 } 940 dirhead = NULL; 941 while (get_line()) { 942 if (debug) 943 warnx("got line %s", line); 944 cp = line; 945 nextfield(&cp, &endcp); 946 if (*cp == '#') 947 goto nextline; 948 949 /* 950 * Set defaults. 951 */ 952 has_host = FALSE; 953 anon = def_anon; 954 exflags = MNT_EXPORTED; 955 got_nondir = 0; 956 opt_flags = 0; 957 ep = NULL; 958 959 /* 960 * Create new exports list entry 961 */ 962 len = endcp-cp; 963 tgrp = grp = get_grp(); 964 while (len > 0) { 965 if (len > RPCMNT_NAMELEN) { 966 getexp_err(ep, tgrp); 967 goto nextline; 968 } 969 if (*cp == '-') { 970 if (ep == NULL) { 971 getexp_err(ep, tgrp); 972 goto nextline; 973 } 974 if (debug) 975 warnx("doing opt %s", cp); 976 got_nondir = 1; 977 if (do_opt(&cp, &endcp, ep, grp, &has_host, 978 &exflags, &anon)) { 979 getexp_err(ep, tgrp); 980 goto nextline; 981 } 982 } else if (*cp == '/') { 983 savedc = *endcp; 984 *endcp = '\0'; 985 if (check_dirpath(cp) && 986 statfs(cp, &fsb) >= 0) { 987 if (got_nondir) { 988 syslog(LOG_ERR, "dirs must be first"); 989 getexp_err(ep, tgrp); 990 goto nextline; 991 } 992 if (ep) { 993 if (ep->ex_fs.val[0] != fsb.f_fsid.val[0] || 994 ep->ex_fs.val[1] != fsb.f_fsid.val[1]) { 995 getexp_err(ep, tgrp); 996 goto nextline; 997 } 998 } else { 999 /* 1000 * See if this directory is already 1001 * in the list. 1002 */ 1003 ep = ex_search(&fsb.f_fsid); 1004 if (ep == NULL) { 1005 ep = get_exp(); 1006 ep->ex_fs = fsb.f_fsid; 1007 ep->ex_fsdir = (char *) 1008 malloc(strlen(fsb.f_mntonname) + 1); 1009 if (ep->ex_fsdir) 1010 strcpy(ep->ex_fsdir, 1011 fsb.f_mntonname); 1012 else 1013 out_of_mem(); 1014 if (debug) 1015 warnx("making new ep fs=0x%x,0x%x", 1016 fsb.f_fsid.val[0], 1017 fsb.f_fsid.val[1]); 1018 } else if (debug) 1019 warnx("found ep fs=0x%x,0x%x", 1020 fsb.f_fsid.val[0], 1021 fsb.f_fsid.val[1]); 1022 } 1023 1024 /* 1025 * Add dirpath to export mount point. 1026 */ 1027 dirp = add_expdir(&dirhead, cp, len); 1028 dirplen = len; 1029 } else { 1030 getexp_err(ep, tgrp); 1031 goto nextline; 1032 } 1033 *endcp = savedc; 1034 } else { 1035 savedc = *endcp; 1036 *endcp = '\0'; 1037 got_nondir = 1; 1038 if (ep == NULL) { 1039 getexp_err(ep, tgrp); 1040 goto nextline; 1041 } 1042 1043 /* 1044 * Get the host or netgroup. 1045 */ 1046 setnetgrent(cp); 1047 netgrp = getnetgrent(&hst, &usr, &dom); 1048 do { 1049 if (has_host) { 1050 grp->gr_next = get_grp(); 1051 grp = grp->gr_next; 1052 } 1053 if (netgrp) { 1054 if (hst == NULL) { 1055 syslog(LOG_ERR, 1056 "null hostname in netgroup %s, skipping", cp); 1057 grp->gr_type = GT_IGNORE; 1058 } else if (get_host(hst, grp, tgrp)) { 1059 syslog(LOG_ERR, 1060 "bad host %s in netgroup %s, skipping", hst, cp); 1061 grp->gr_type = GT_IGNORE; 1062 } 1063 } else if (get_host(cp, grp, tgrp)) { 1064 syslog(LOG_ERR, "bad host %s, skipping", cp); 1065 grp->gr_type = GT_IGNORE; 1066 } 1067 has_host = TRUE; 1068 } while (netgrp && getnetgrent(&hst, &usr, &dom)); 1069 endnetgrent(); 1070 *endcp = savedc; 1071 } 1072 cp = endcp; 1073 nextfield(&cp, &endcp); 1074 len = endcp - cp; 1075 } 1076 if (check_options(dirhead)) { 1077 getexp_err(ep, tgrp); 1078 goto nextline; 1079 } 1080 if (!has_host) { 1081 grp->gr_type = GT_DEFAULT; 1082 if (debug) 1083 warnx("adding a default entry"); 1084 1085 /* 1086 * Don't allow a network export coincide with a list of 1087 * host(s) on the same line. 1088 */ 1089 } else if ((opt_flags & OP_NET) && tgrp->gr_next) { 1090 syslog(LOG_ERR, "network/host conflict"); 1091 getexp_err(ep, tgrp); 1092 goto nextline; 1093 1094 /* 1095 * If an export list was specified on this line, make sure 1096 * that we have at least one valid entry, otherwise skip it. 1097 */ 1098 } else { 1099 grp = tgrp; 1100 while (grp && grp->gr_type == GT_IGNORE) 1101 grp = grp->gr_next; 1102 if (! grp) { 1103 getexp_err(ep, tgrp); 1104 goto nextline; 1105 } 1106 } 1107 1108 /* 1109 * Loop through hosts, pushing the exports into the kernel. 1110 * After loop, tgrp points to the start of the list and 1111 * grp points to the last entry in the list. 1112 */ 1113 grp = tgrp; 1114 do { 1115 if (do_mount(ep, grp, exflags, &anon, dirp, dirplen, 1116 &fsb)) { 1117 getexp_err(ep, tgrp); 1118 goto nextline; 1119 } 1120 } while (grp->gr_next && (grp = grp->gr_next)); 1121 1122 /* 1123 * Success. Update the data structures. 1124 */ 1125 if (has_host) { 1126 hang_dirp(dirhead, tgrp, ep, opt_flags); 1127 grp->gr_next = grphead; 1128 grphead = tgrp; 1129 } else { 1130 hang_dirp(dirhead, NULL, ep, 1131 opt_flags); 1132 free_grp(grp); 1133 } 1134 dirhead = NULL; 1135 if ((ep->ex_flag & EX_LINKED) == 0) { 1136 ep2 = exphead; 1137 epp = &exphead; 1138 1139 /* 1140 * Insert in the list in alphabetical order. 1141 */ 1142 while (ep2 && strcmp(ep2->ex_fsdir, ep->ex_fsdir) < 0) { 1143 epp = &ep2->ex_next; 1144 ep2 = ep2->ex_next; 1145 } 1146 if (ep2) 1147 ep->ex_next = ep2; 1148 *epp = ep; 1149 ep->ex_flag |= EX_LINKED; 1150 } 1151 nextline: 1152 if (dirhead) { 1153 free_dir(dirhead); 1154 dirhead = NULL; 1155 } 1156 } 1157 fclose(exp_file); 1158 } 1159 1160 /* 1161 * Allocate an export list element 1162 */ 1163 struct exportlist * 1164 get_exp(void) 1165 { 1166 struct exportlist *ep; 1167 1168 ep = (struct exportlist *)malloc(sizeof (struct exportlist)); 1169 if (ep == NULL) 1170 out_of_mem(); 1171 memset(ep, 0, sizeof(struct exportlist)); 1172 return (ep); 1173 } 1174 1175 /* 1176 * Allocate a group list element 1177 */ 1178 struct grouplist * 1179 get_grp(void) 1180 { 1181 struct grouplist *gp; 1182 1183 gp = (struct grouplist *)malloc(sizeof (struct grouplist)); 1184 if (gp == NULL) 1185 out_of_mem(); 1186 memset(gp, 0, sizeof(struct grouplist)); 1187 return (gp); 1188 } 1189 1190 /* 1191 * Clean up upon an error in get_exportlist(). 1192 */ 1193 void 1194 getexp_err(struct exportlist *ep, struct grouplist *grp) 1195 { 1196 struct grouplist *tgrp; 1197 1198 if (!(opt_flags & OP_QUIET)) 1199 syslog(LOG_ERR, "bad exports list line %s", line); 1200 if (ep && (ep->ex_flag & EX_LINKED) == 0) 1201 free_exp(ep); 1202 while (grp) { 1203 tgrp = grp; 1204 grp = grp->gr_next; 1205 free_grp(tgrp); 1206 } 1207 } 1208 1209 /* 1210 * Search the export list for a matching fs. 1211 */ 1212 struct exportlist * 1213 ex_search(fsid_t *fsid) 1214 { 1215 struct exportlist *ep; 1216 1217 ep = exphead; 1218 while (ep) { 1219 if (ep->ex_fs.val[0] == fsid->val[0] && 1220 ep->ex_fs.val[1] == fsid->val[1]) 1221 return (ep); 1222 ep = ep->ex_next; 1223 } 1224 return (ep); 1225 } 1226 1227 /* 1228 * Add a directory path to the list. 1229 */ 1230 char * 1231 add_expdir(struct dirlist **dpp, char *cp, int len) 1232 { 1233 struct dirlist *dp; 1234 1235 dp = (struct dirlist *)malloc(sizeof (struct dirlist) + len); 1236 if (dp == NULL) 1237 out_of_mem(); 1238 dp->dp_left = *dpp; 1239 dp->dp_right = NULL; 1240 dp->dp_flag = 0; 1241 dp->dp_hosts = NULL; 1242 strcpy(dp->dp_dirp, cp); 1243 *dpp = dp; 1244 return (dp->dp_dirp); 1245 } 1246 1247 /* 1248 * Hang the dir list element off the dirpath binary tree as required 1249 * and update the entry for host. 1250 */ 1251 void 1252 hang_dirp(struct dirlist *dp, struct grouplist *grp, struct exportlist *ep, 1253 int flags) 1254 { 1255 struct hostlist *hp; 1256 struct dirlist *dp2; 1257 1258 if (flags & OP_ALLDIRS) { 1259 if (ep->ex_defdir) 1260 free((caddr_t)dp); 1261 else 1262 ep->ex_defdir = dp; 1263 if (grp == NULL) { 1264 ep->ex_defdir->dp_flag |= DP_DEFSET; 1265 if (flags & OP_KERB) 1266 ep->ex_defdir->dp_flag |= DP_KERB; 1267 } else while (grp) { 1268 hp = get_ht(); 1269 if (flags & OP_KERB) 1270 hp->ht_flag |= DP_KERB; 1271 hp->ht_grp = grp; 1272 hp->ht_next = ep->ex_defdir->dp_hosts; 1273 ep->ex_defdir->dp_hosts = hp; 1274 grp = grp->gr_next; 1275 } 1276 } else { 1277 1278 /* 1279 * Loop through the directories adding them to the tree. 1280 */ 1281 while (dp) { 1282 dp2 = dp->dp_left; 1283 add_dlist(&ep->ex_dirl, dp, grp, flags); 1284 dp = dp2; 1285 } 1286 } 1287 } 1288 1289 /* 1290 * Traverse the binary tree either updating a node that is already there 1291 * for the new directory or adding the new node. 1292 */ 1293 void 1294 add_dlist(struct dirlist **dpp, struct dirlist *newdp, struct grouplist *grp, 1295 int flags) 1296 { 1297 struct dirlist *dp; 1298 struct hostlist *hp; 1299 int cmp; 1300 1301 dp = *dpp; 1302 if (dp) { 1303 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp); 1304 if (cmp > 0) { 1305 add_dlist(&dp->dp_left, newdp, grp, flags); 1306 return; 1307 } else if (cmp < 0) { 1308 add_dlist(&dp->dp_right, newdp, grp, flags); 1309 return; 1310 } else 1311 free((caddr_t)newdp); 1312 } else { 1313 dp = newdp; 1314 dp->dp_left = NULL; 1315 *dpp = dp; 1316 } 1317 if (grp) { 1318 1319 /* 1320 * Hang all of the host(s) off of the directory point. 1321 */ 1322 do { 1323 hp = get_ht(); 1324 if (flags & OP_KERB) 1325 hp->ht_flag |= DP_KERB; 1326 hp->ht_grp = grp; 1327 hp->ht_next = dp->dp_hosts; 1328 dp->dp_hosts = hp; 1329 grp = grp->gr_next; 1330 } while (grp); 1331 } else { 1332 dp->dp_flag |= DP_DEFSET; 1333 if (flags & OP_KERB) 1334 dp->dp_flag |= DP_KERB; 1335 } 1336 } 1337 1338 /* 1339 * Search for a dirpath on the export point. 1340 */ 1341 struct dirlist * 1342 dirp_search(struct dirlist *dp, char *dirp) 1343 { 1344 int cmp; 1345 1346 if (dp) { 1347 cmp = strcmp(dp->dp_dirp, dirp); 1348 if (cmp > 0) 1349 return (dirp_search(dp->dp_left, dirp)); 1350 else if (cmp < 0) 1351 return (dirp_search(dp->dp_right, dirp)); 1352 else 1353 return (dp); 1354 } 1355 return (dp); 1356 } 1357 1358 /* 1359 * Scan for a host match in a directory tree. 1360 */ 1361 int 1362 chk_host(struct dirlist *dp, struct sockaddr *saddr, int *defsetp, 1363 int *hostsetp) 1364 { 1365 struct hostlist *hp; 1366 struct grouplist *grp; 1367 struct addrinfo *ai; 1368 1369 if (dp) { 1370 if (dp->dp_flag & DP_DEFSET) 1371 *defsetp = dp->dp_flag; 1372 hp = dp->dp_hosts; 1373 while (hp) { 1374 grp = hp->ht_grp; 1375 switch (grp->gr_type) { 1376 case GT_HOST: 1377 ai = grp->gr_ptr.gt_addrinfo; 1378 for (; ai; ai = ai->ai_next) { 1379 if (!sacmp(ai->ai_addr, saddr, NULL)) { 1380 *hostsetp = 1381 (hp->ht_flag | DP_HOSTSET); 1382 return (1); 1383 } 1384 } 1385 break; 1386 case GT_NET: 1387 if (!sacmp(saddr, (struct sockaddr *) 1388 &grp->gr_ptr.gt_net.nt_net, 1389 (struct sockaddr *) 1390 &grp->gr_ptr.gt_net.nt_mask)) { 1391 *hostsetp = (hp->ht_flag | DP_HOSTSET); 1392 return (1); 1393 } 1394 break; 1395 } 1396 hp = hp->ht_next; 1397 } 1398 } 1399 return (0); 1400 } 1401 1402 /* 1403 * Scan tree for a host that matches the address. 1404 */ 1405 int 1406 scan_tree(struct dirlist *dp, struct sockaddr *saddr) 1407 { 1408 int defset, hostset; 1409 1410 if (dp) { 1411 if (scan_tree(dp->dp_left, saddr)) 1412 return (1); 1413 if (chk_host(dp, saddr, &defset, &hostset)) 1414 return (1); 1415 if (scan_tree(dp->dp_right, saddr)) 1416 return (1); 1417 } 1418 return (0); 1419 } 1420 1421 /* 1422 * Traverse the dirlist tree and free it up. 1423 */ 1424 void 1425 free_dir(struct dirlist *dp) 1426 { 1427 1428 if (dp) { 1429 free_dir(dp->dp_left); 1430 free_dir(dp->dp_right); 1431 free_host(dp->dp_hosts); 1432 free((caddr_t)dp); 1433 } 1434 } 1435 1436 /* 1437 * Parse the option string and update fields. 1438 * Option arguments may either be -<option>=<value> or 1439 * -<option> <value> 1440 */ 1441 int 1442 do_opt(char **cpp, char **endcpp, struct exportlist *ep, struct grouplist *grp, 1443 int *has_hostp, int *exflagsp, struct ucred *cr) 1444 { 1445 char *cpoptarg, *cpoptend; 1446 char *cp, *endcp, *cpopt, savedc, savedc2; 1447 int allflag, usedarg; 1448 1449 savedc2 = '\0'; 1450 cpopt = *cpp; 1451 cpopt++; 1452 cp = *endcpp; 1453 savedc = *cp; 1454 *cp = '\0'; 1455 while (cpopt && *cpopt) { 1456 allflag = 1; 1457 usedarg = -2; 1458 if ((cpoptend = strchr(cpopt, ','))) { 1459 *cpoptend++ = '\0'; 1460 if ((cpoptarg = strchr(cpopt, '='))) 1461 *cpoptarg++ = '\0'; 1462 } else { 1463 if ((cpoptarg = strchr(cpopt, '='))) 1464 *cpoptarg++ = '\0'; 1465 else { 1466 *cp = savedc; 1467 nextfield(&cp, &endcp); 1468 **endcpp = '\0'; 1469 if (endcp > cp && *cp != '-') { 1470 cpoptarg = cp; 1471 savedc2 = *endcp; 1472 *endcp = '\0'; 1473 usedarg = 0; 1474 } 1475 } 1476 } 1477 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) { 1478 *exflagsp |= MNT_EXRDONLY; 1479 } else if (cpoptarg && (!strcmp(cpopt, "maproot") || 1480 !(allflag = strcmp(cpopt, "mapall")) || 1481 !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) { 1482 usedarg++; 1483 parsecred(cpoptarg, cr); 1484 if (allflag == 0) { 1485 *exflagsp |= MNT_EXPORTANON; 1486 opt_flags |= OP_MAPALL; 1487 } else 1488 opt_flags |= OP_MAPROOT; 1489 } else if (!strcmp(cpopt, "kerb") || !strcmp(cpopt, "k")) { 1490 *exflagsp |= MNT_EXKERB; 1491 opt_flags |= OP_KERB; 1492 } else if (cpoptarg && (!strcmp(cpopt, "mask") || 1493 !strcmp(cpopt, "m"))) { 1494 if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) { 1495 syslog(LOG_ERR, "bad mask: %s", cpoptarg); 1496 return (1); 1497 } 1498 usedarg++; 1499 opt_flags |= OP_MASK; 1500 } else if (cpoptarg && (!strcmp(cpopt, "network") || 1501 !strcmp(cpopt, "n"))) { 1502 if (strchr(cpoptarg, '/') != NULL) { 1503 if (debug) 1504 fprintf(stderr, "setting OP_MASKLEN\n"); 1505 opt_flags |= OP_MASKLEN; 1506 } 1507 if (grp->gr_type != GT_NULL) { 1508 syslog(LOG_ERR, "network/host conflict"); 1509 return (1); 1510 } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) { 1511 syslog(LOG_ERR, "bad net: %s", cpoptarg); 1512 return (1); 1513 } 1514 grp->gr_type = GT_NET; 1515 *has_hostp = 1; 1516 usedarg++; 1517 opt_flags |= OP_NET; 1518 } else if (!strcmp(cpopt, "alldirs")) { 1519 opt_flags |= OP_ALLDIRS; 1520 } else if (!strcmp(cpopt, "public")) { 1521 *exflagsp |= MNT_EXPUBLIC; 1522 } else if (!strcmp(cpopt, "webnfs")) { 1523 *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON); 1524 opt_flags |= OP_MAPALL; 1525 } else if (cpoptarg && !strcmp(cpopt, "index")) { 1526 ep->ex_indexfile = strdup(cpoptarg); 1527 } else if (!strcmp(cpopt, "quiet")) { 1528 opt_flags |= OP_QUIET; 1529 } else { 1530 syslog(LOG_ERR, "bad opt %s", cpopt); 1531 return (1); 1532 } 1533 if (usedarg >= 0) { 1534 *endcp = savedc2; 1535 **endcpp = savedc; 1536 if (usedarg > 0) { 1537 *cpp = cp; 1538 *endcpp = endcp; 1539 } 1540 return (0); 1541 } 1542 cpopt = cpoptend; 1543 } 1544 **endcpp = savedc; 1545 return (0); 1546 } 1547 1548 /* 1549 * Translate a character string to the corresponding list of network 1550 * addresses for a hostname. 1551 */ 1552 int 1553 get_host(char *cp, struct grouplist *grp, struct grouplist *tgrp) 1554 { 1555 struct grouplist *checkgrp; 1556 struct addrinfo *ai, *tai, hints; 1557 int ecode; 1558 char host[NI_MAXHOST]; 1559 1560 if (grp->gr_type != GT_NULL) { 1561 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp); 1562 return (1); 1563 } 1564 memset(&hints, 0, sizeof hints); 1565 hints.ai_flags = AI_CANONNAME; 1566 hints.ai_protocol = IPPROTO_UDP; 1567 ecode = getaddrinfo(cp, NULL, &hints, &ai); 1568 if (ecode != 0) { 1569 syslog(LOG_ERR,"can't get address info for host %s", cp); 1570 return 1; 1571 } 1572 grp->gr_ptr.gt_addrinfo = ai; 1573 while (ai != NULL) { 1574 if (ai->ai_canonname == NULL) { 1575 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host, 1576 sizeof host, NULL, 0, ninumeric) != 0) 1577 strlcpy(host, "?", sizeof(host)); 1578 ai->ai_canonname = strdup(host); 1579 ai->ai_flags |= AI_CANONNAME; 1580 } 1581 if (debug) 1582 fprintf(stderr, "got host %s\n", ai->ai_canonname); 1583 /* 1584 * Sanity check: make sure we don't already have an entry 1585 * for this host in the grouplist. 1586 */ 1587 for (checkgrp = tgrp; checkgrp != NULL; 1588 checkgrp = checkgrp->gr_next) { 1589 if (checkgrp->gr_type != GT_HOST) 1590 continue; 1591 for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL; 1592 tai = tai->ai_next) { 1593 if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0) 1594 continue; 1595 if (debug) 1596 fprintf(stderr, 1597 "ignoring duplicate host %s\n", 1598 ai->ai_canonname); 1599 grp->gr_type = GT_IGNORE; 1600 return (0); 1601 } 1602 } 1603 ai = ai->ai_next; 1604 } 1605 grp->gr_type = GT_HOST; 1606 return (0); 1607 } 1608 1609 /* 1610 * Free up an exports list component 1611 */ 1612 void 1613 free_exp(struct exportlist *ep) 1614 { 1615 1616 if (ep->ex_defdir) { 1617 free_host(ep->ex_defdir->dp_hosts); 1618 free((caddr_t)ep->ex_defdir); 1619 } 1620 if (ep->ex_fsdir) 1621 free(ep->ex_fsdir); 1622 if (ep->ex_indexfile) 1623 free(ep->ex_indexfile); 1624 free_dir(ep->ex_dirl); 1625 free((caddr_t)ep); 1626 } 1627 1628 /* 1629 * Free hosts. 1630 */ 1631 void 1632 free_host(struct hostlist *hp) 1633 { 1634 struct hostlist *hp2; 1635 1636 while (hp) { 1637 hp2 = hp; 1638 hp = hp->ht_next; 1639 free((caddr_t)hp2); 1640 } 1641 } 1642 1643 struct hostlist * 1644 get_ht(void) 1645 { 1646 struct hostlist *hp; 1647 1648 hp = (struct hostlist *)malloc(sizeof (struct hostlist)); 1649 if (hp == NULL) 1650 out_of_mem(); 1651 hp->ht_next = NULL; 1652 hp->ht_flag = 0; 1653 return (hp); 1654 } 1655 1656 /* 1657 * Out of memory, fatal 1658 */ 1659 void 1660 out_of_mem(void) 1661 { 1662 1663 syslog(LOG_ERR, "out of memory"); 1664 exit(2); 1665 } 1666 1667 /* 1668 * Do the mount syscall with the update flag to push the export info into 1669 * the kernel. 1670 */ 1671 int 1672 do_mount(struct exportlist *ep, struct grouplist *grp, int exflags, 1673 struct ucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb) 1674 { 1675 struct statfs fsb1; 1676 struct addrinfo *ai; 1677 struct export_args *eap; 1678 char *cp = NULL; 1679 int done; 1680 char savedc = '\0'; 1681 union { 1682 struct ufs_args ua; 1683 struct iso_args ia; 1684 struct mfs_args ma; 1685 struct msdosfs_args da; 1686 struct ntfs_args na; 1687 } args; 1688 1689 bzero(&args, sizeof args); 1690 /* XXX, we assume that all xx_args look like ufs_args. */ 1691 args.ua.fspec = 0; 1692 eap = &args.ua.export; 1693 1694 eap->ex_flags = exflags; 1695 eap->ex_anon = *anoncrp; 1696 eap->ex_indexfile = ep->ex_indexfile; 1697 if (grp->gr_type == GT_HOST) 1698 ai = grp->gr_ptr.gt_addrinfo; 1699 else 1700 ai = NULL; 1701 done = FALSE; 1702 while (!done) { 1703 switch (grp->gr_type) { 1704 case GT_HOST: 1705 if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0) 1706 goto skip; 1707 eap->ex_addr = ai->ai_addr; 1708 eap->ex_addrlen = ai->ai_addrlen; 1709 eap->ex_masklen = 0; 1710 break; 1711 case GT_NET: 1712 if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 && 1713 have_v6 == 0) 1714 goto skip; 1715 eap->ex_addr = 1716 (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net; 1717 eap->ex_addrlen = args.ua.export.ex_addr->sa_len; 1718 eap->ex_mask = 1719 (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask; 1720 eap->ex_masklen = args.ua.export.ex_mask->sa_len; 1721 break; 1722 case GT_DEFAULT: 1723 eap->ex_addr = NULL; 1724 eap->ex_addrlen = 0; 1725 eap->ex_mask = NULL; 1726 eap->ex_masklen = 0; 1727 break; 1728 case GT_IGNORE: 1729 return(0); 1730 break; 1731 default: 1732 syslog(LOG_ERR, "bad grouptype"); 1733 if (cp) 1734 *cp = savedc; 1735 return (1); 1736 } 1737 1738 /* 1739 * XXX: 1740 * Maybe I should just use the fsb->f_mntonname path instead 1741 * of looping back up the dirp to the mount point?? 1742 * Also, needs to know how to export all types of local 1743 * exportable file systems and not just "ufs". 1744 */ 1745 for (;;) { 1746 int r; 1747 1748 r = mountctl(fsb->f_mntonname, MOUNTCTL_SET_EXPORT, 1749 -1, 1750 &args.ua.export, sizeof(args.ua.export), 1751 NULL, 0); 1752 if (r < 0 && errno == EOPNOTSUPP) { 1753 r = mount(fsb->f_fstypename, dirp, 1754 fsb->f_flags | MNT_UPDATE, 1755 (caddr_t)&args); 1756 } 1757 if (r >= 0) 1758 break; 1759 if (cp) 1760 *cp-- = savedc; 1761 else 1762 cp = dirp + dirplen - 1; 1763 if (opt_flags & OP_QUIET) 1764 return (1); 1765 if (errno == EPERM) { 1766 if (debug) 1767 warnx("can't change attributes for %s", 1768 dirp); 1769 syslog(LOG_ERR, 1770 "can't change attributes for %s", dirp); 1771 return (1); 1772 } 1773 if (opt_flags & OP_ALLDIRS) { 1774 if (errno == EINVAL) 1775 syslog(LOG_ERR, 1776 "-alldirs requested but %s is not a filesystem mountpoint", 1777 dirp); 1778 else 1779 syslog(LOG_ERR, 1780 "could not remount %s: %m", 1781 dirp); 1782 return (1); 1783 } 1784 /* back up over the last component */ 1785 while (*cp == '/' && cp > dirp) 1786 cp--; 1787 while (*(cp - 1) != '/' && cp > dirp) 1788 cp--; 1789 if (cp == dirp) { 1790 if (debug) 1791 warnx("mnt unsucc"); 1792 syslog(LOG_ERR, "can't export %s", dirp); 1793 return (1); 1794 } 1795 savedc = *cp; 1796 *cp = '\0'; 1797 /* Check that we're still on the same filesystem. */ 1798 if (statfs(dirp, &fsb1) != 0 || bcmp(&fsb1.f_fsid, 1799 &fsb->f_fsid, sizeof(fsb1.f_fsid)) != 0) { 1800 *cp = savedc; 1801 syslog(LOG_ERR, "can't export %s", dirp); 1802 return (1); 1803 } 1804 } 1805 skip: 1806 if (ai != NULL) 1807 ai = ai->ai_next; 1808 if (ai == NULL) 1809 done = TRUE; 1810 } 1811 if (cp) 1812 *cp = savedc; 1813 return (0); 1814 } 1815 1816 /* 1817 * Translate a net address. 1818 * 1819 * If `maskflg' is nonzero, then `cp' is a netmask, not a network address. 1820 */ 1821 int 1822 get_net(char *cp, struct netmsk *net, int maskflg) 1823 { 1824 struct netent *np; 1825 char *name, *p, *prefp; 1826 struct sockaddr_in sin; 1827 struct sockaddr *sa; 1828 struct addrinfo hints, *ai = NULL; 1829 char netname[NI_MAXHOST]; 1830 long preflen; 1831 1832 p = prefp = NULL; 1833 if ((opt_flags & OP_MASKLEN) && !maskflg) { 1834 p = strchr(cp, '/'); 1835 *p = '\0'; 1836 prefp = p + 1; 1837 } 1838 1839 if ((np = getnetbyname(cp)) != NULL) { 1840 bzero(&sin, sizeof sin); 1841 sin.sin_family = AF_INET; 1842 sin.sin_len = sizeof sin; 1843 sin.sin_addr = inet_makeaddr(np->n_net, 0); 1844 sa = (struct sockaddr *)&sin; 1845 } else if (isxdigit(*cp) || *cp == ':') { 1846 memset(&hints, 0, sizeof hints); 1847 /* Ensure the mask and the network have the same family. */ 1848 if (maskflg && (opt_flags & OP_NET)) 1849 hints.ai_family = net->nt_net.ss_family; 1850 else if (!maskflg && (opt_flags & OP_HAVEMASK)) 1851 hints.ai_family = net->nt_mask.ss_family; 1852 else 1853 hints.ai_family = AF_UNSPEC; 1854 hints.ai_flags = AI_NUMERICHOST; 1855 if (getaddrinfo(cp, NULL, &hints, &ai) != 0) 1856 goto fail; 1857 if (ai->ai_family == AF_INET) { 1858 /* 1859 * The address in `cp' is really a network address, so 1860 * use inet_network() to re-interpret this correctly. 1861 * e.g. "127.1" means 127.1.0.0, not 127.0.0.1. 1862 */ 1863 bzero(&sin, sizeof sin); 1864 sin.sin_family = AF_INET; 1865 sin.sin_len = sizeof sin; 1866 sin.sin_addr = inet_makeaddr(inet_network(cp), 0); 1867 if (debug) 1868 fprintf(stderr, "get_net: v4 addr %s\n", 1869 inet_ntoa(sin.sin_addr)); 1870 sa = (struct sockaddr *)&sin; 1871 } else 1872 sa = ai->ai_addr; 1873 } else 1874 goto fail; 1875 1876 if (maskflg) { 1877 /* The specified sockaddr is a mask. */ 1878 if (checkmask(sa) != 0) 1879 goto fail; 1880 bcopy(sa, &net->nt_mask, sa->sa_len); 1881 opt_flags |= OP_HAVEMASK; 1882 } else { 1883 /* The specified sockaddr is a network address. */ 1884 bcopy(sa, &net->nt_net, sa->sa_len); 1885 1886 /* Get a network name for the export list. */ 1887 if (np) { 1888 name = np->n_name; 1889 } else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname, 1890 NULL, 0, ninumeric) == 0) { 1891 name = netname; 1892 } else { 1893 goto fail; 1894 } 1895 if ((net->nt_name = strdup(name)) == NULL) 1896 out_of_mem(); 1897 1898 /* 1899 * Extract a mask from either a "/<masklen>" suffix, or 1900 * from the class of an IPv4 address. 1901 */ 1902 if (opt_flags & OP_MASKLEN) { 1903 preflen = strtol(prefp, NULL, 10); 1904 if (preflen < 0L || preflen == LONG_MAX) 1905 goto fail; 1906 bcopy(sa, &net->nt_mask, sa->sa_len); 1907 if (makemask(&net->nt_mask, (int)preflen) != 0) 1908 goto fail; 1909 opt_flags |= OP_HAVEMASK; 1910 *p = '/'; 1911 } else if (sa->sa_family == AF_INET && 1912 (opt_flags & OP_MASK) == 0) { 1913 in_addr_t addr; 1914 1915 addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr; 1916 if (IN_CLASSA(addr)) 1917 preflen = 8; 1918 else if (IN_CLASSB(addr)) 1919 preflen = 16; 1920 else if (IN_CLASSC(addr)) 1921 preflen = 24; 1922 else if (IN_CLASSD(addr)) 1923 preflen = 28; 1924 else 1925 preflen = 32; /* XXX */ 1926 1927 bcopy(sa, &net->nt_mask, sa->sa_len); 1928 makemask(&net->nt_mask, (int)preflen); 1929 opt_flags |= OP_HAVEMASK; 1930 } 1931 } 1932 1933 if (ai) 1934 freeaddrinfo(ai); 1935 return 0; 1936 1937 fail: 1938 if (ai) 1939 freeaddrinfo(ai); 1940 return 1; 1941 } 1942 1943 /* 1944 * Parse out the next white space separated field 1945 */ 1946 void 1947 nextfield(char **cp, char **endcp) 1948 { 1949 char *p; 1950 1951 p = *cp; 1952 while (*p == ' ' || *p == '\t') 1953 p++; 1954 if (*p == '\n' || *p == '\0') 1955 *cp = *endcp = p; 1956 else { 1957 *cp = p++; 1958 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0') 1959 p++; 1960 *endcp = p; 1961 } 1962 } 1963 1964 /* 1965 * Get an exports file line. Skip over blank lines and handle line 1966 * continuations. 1967 */ 1968 int 1969 get_line(void) 1970 { 1971 char *p, *cp; 1972 int len; 1973 int totlen, cont_line; 1974 1975 /* 1976 * Loop around ignoring blank lines and getting all continuation lines. 1977 */ 1978 p = line; 1979 totlen = 0; 1980 do { 1981 if (fgets(p, LINESIZ - totlen, exp_file) == NULL) 1982 return (0); 1983 len = strlen(p); 1984 cp = p + len - 1; 1985 cont_line = 0; 1986 while (cp >= p && 1987 (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) { 1988 if (*cp == '\\') 1989 cont_line = 1; 1990 cp--; 1991 len--; 1992 } 1993 if (cont_line) { 1994 *++cp = ' '; 1995 len++; 1996 } 1997 *++cp = '\0'; 1998 if (len > 0) { 1999 totlen += len; 2000 if (totlen >= LINESIZ) { 2001 syslog(LOG_ERR, "exports line too long"); 2002 exit(2); 2003 } 2004 p = cp; 2005 } 2006 } while (totlen == 0 || cont_line); 2007 return (1); 2008 } 2009 2010 /* 2011 * Parse a description of a credential. 2012 */ 2013 void 2014 parsecred(char *namelist, struct ucred *cr) 2015 { 2016 char *name; 2017 int cnt; 2018 char *names; 2019 struct passwd *pw; 2020 struct group *gr; 2021 int ngroups, groups[NGROUPS + 1]; 2022 2023 /* 2024 * Set up the unprivileged user. 2025 */ 2026 cr->cr_ref = 1; 2027 cr->cr_uid = -2; 2028 cr->cr_groups[0] = -2; 2029 cr->cr_ngroups = 1; 2030 /* 2031 * Get the user's password table entry. 2032 */ 2033 names = strsep(&namelist, " \t\n"); 2034 name = strsep(&names, ":"); 2035 if (isdigit(*name) || *name == '-') 2036 pw = getpwuid(atoi(name)); 2037 else 2038 pw = getpwnam(name); 2039 /* 2040 * Credentials specified as those of a user. 2041 */ 2042 if (names == NULL) { 2043 if (pw == NULL) { 2044 syslog(LOG_ERR, "unknown user: %s", name); 2045 return; 2046 } 2047 cr->cr_uid = pw->pw_uid; 2048 ngroups = NGROUPS + 1; 2049 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups)) 2050 syslog(LOG_ERR, "too many groups"); 2051 /* 2052 * Convert from int's to gid_t's and compress out duplicate 2053 */ 2054 cr->cr_ngroups = ngroups - 1; 2055 cr->cr_groups[0] = groups[0]; 2056 for (cnt = 2; cnt < ngroups; cnt++) 2057 cr->cr_groups[cnt - 1] = groups[cnt]; 2058 return; 2059 } 2060 /* 2061 * Explicit credential specified as a colon separated list: 2062 * uid:gid:gid:... 2063 */ 2064 if (pw != NULL) 2065 cr->cr_uid = pw->pw_uid; 2066 else if (isdigit(*name) || *name == '-') 2067 cr->cr_uid = atoi(name); 2068 else { 2069 syslog(LOG_ERR, "unknown user: %s", name); 2070 return; 2071 } 2072 cr->cr_ngroups = 0; 2073 while (names != NULL && *names != '\0' && cr->cr_ngroups < NGROUPS) { 2074 name = strsep(&names, ":"); 2075 if (isdigit(*name) || *name == '-') { 2076 cr->cr_groups[cr->cr_ngroups++] = atoi(name); 2077 } else { 2078 if ((gr = getgrnam(name)) == NULL) { 2079 syslog(LOG_ERR, "unknown group: %s", name); 2080 continue; 2081 } 2082 cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid; 2083 } 2084 } 2085 if (names != NULL && *names != '\0' && cr->cr_ngroups == NGROUPS) 2086 syslog(LOG_ERR, "too many groups"); 2087 } 2088 2089 #define STRSIZ (RPCMNT_NAMELEN+RPCMNT_PATHLEN+50) 2090 /* 2091 * Routines that maintain the remote mounttab 2092 */ 2093 void 2094 get_mountlist(void) 2095 { 2096 struct mountlist *mlp, **mlpp; 2097 char *host, *dirp, *cp; 2098 char str[STRSIZ]; 2099 FILE *mlfile; 2100 2101 if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) { 2102 if (errno == ENOENT) 2103 return; 2104 else { 2105 syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST); 2106 return; 2107 } 2108 } 2109 mlpp = &mlhead; 2110 while (fgets(str, STRSIZ, mlfile) != NULL) { 2111 cp = str; 2112 host = strsep(&cp, " \t\n"); 2113 dirp = strsep(&cp, " \t\n"); 2114 if (host == NULL || dirp == NULL) 2115 continue; 2116 mlp = (struct mountlist *)malloc(sizeof (*mlp)); 2117 if (mlp == NULL) 2118 out_of_mem(); 2119 strncpy(mlp->ml_host, host, RPCMNT_NAMELEN); 2120 mlp->ml_host[RPCMNT_NAMELEN] = '\0'; 2121 strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN); 2122 mlp->ml_dirp[RPCMNT_PATHLEN] = '\0'; 2123 mlp->ml_next = NULL; 2124 *mlpp = mlp; 2125 mlpp = &mlp->ml_next; 2126 } 2127 fclose(mlfile); 2128 } 2129 2130 void 2131 del_mlist(char *hostp, char *dirp) 2132 { 2133 struct mountlist *mlp, **mlpp; 2134 struct mountlist *mlp2; 2135 FILE *mlfile; 2136 int fnd = 0; 2137 2138 mlpp = &mlhead; 2139 mlp = mlhead; 2140 while (mlp) { 2141 if (!strcmp(mlp->ml_host, hostp) && 2142 (!dirp || !strcmp(mlp->ml_dirp, dirp))) { 2143 fnd = 1; 2144 mlp2 = mlp; 2145 *mlpp = mlp = mlp->ml_next; 2146 free((caddr_t)mlp2); 2147 } else { 2148 mlpp = &mlp->ml_next; 2149 mlp = mlp->ml_next; 2150 } 2151 } 2152 if (fnd) { 2153 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) { 2154 syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST); 2155 return; 2156 } 2157 mlp = mlhead; 2158 while (mlp) { 2159 fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp); 2160 mlp = mlp->ml_next; 2161 } 2162 fclose(mlfile); 2163 } 2164 } 2165 2166 void 2167 add_mlist(char *hostp, char *dirp) 2168 { 2169 struct mountlist *mlp, **mlpp; 2170 FILE *mlfile; 2171 2172 mlpp = &mlhead; 2173 mlp = mlhead; 2174 while (mlp) { 2175 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp)) 2176 return; 2177 mlpp = &mlp->ml_next; 2178 mlp = mlp->ml_next; 2179 } 2180 mlp = (struct mountlist *)malloc(sizeof (*mlp)); 2181 if (mlp == NULL) 2182 out_of_mem(); 2183 strncpy(mlp->ml_host, hostp, RPCMNT_NAMELEN); 2184 mlp->ml_host[RPCMNT_NAMELEN] = '\0'; 2185 strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN); 2186 mlp->ml_dirp[RPCMNT_PATHLEN] = '\0'; 2187 mlp->ml_next = NULL; 2188 *mlpp = mlp; 2189 if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) { 2190 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST); 2191 return; 2192 } 2193 fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp); 2194 fclose(mlfile); 2195 } 2196 2197 /* 2198 * Free up a group list. 2199 */ 2200 void 2201 free_grp(struct grouplist *grp) 2202 { 2203 if (grp->gr_type == GT_HOST) { 2204 if (grp->gr_ptr.gt_addrinfo != NULL) 2205 freeaddrinfo(grp->gr_ptr.gt_addrinfo); 2206 } else if (grp->gr_type == GT_NET) { 2207 if (grp->gr_ptr.gt_net.nt_name) 2208 free(grp->gr_ptr.gt_net.nt_name); 2209 } 2210 free((caddr_t)grp); 2211 } 2212 2213 #ifdef DEBUG 2214 void 2215 SYSLOG(int pri, const char *fmt, ...) 2216 { 2217 va_list ap; 2218 2219 va_start(ap, fmt); 2220 vfprintf(stderr, fmt, ap); 2221 va_end(ap); 2222 } 2223 #endif /* DEBUG */ 2224 2225 /* 2226 * Check options for consistency. 2227 */ 2228 int 2229 check_options(struct dirlist *dp) 2230 { 2231 2232 if (dp == NULL) 2233 return (1); 2234 if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL) || 2235 (opt_flags & (OP_MAPROOT | OP_KERB)) == (OP_MAPROOT | OP_KERB) || 2236 (opt_flags & (OP_MAPALL | OP_KERB)) == (OP_MAPALL | OP_KERB)) { 2237 syslog(LOG_ERR, "-mapall, -maproot and -kerb mutually exclusive"); 2238 return (1); 2239 } 2240 if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) { 2241 syslog(LOG_ERR, "-mask requires -network"); 2242 return (1); 2243 } 2244 if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) { 2245 syslog(LOG_ERR, "-network requires mask specification"); 2246 return (1); 2247 } 2248 if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) { 2249 syslog(LOG_ERR, "-mask and /masklen are mutually exclusive"); 2250 return (1); 2251 } 2252 if ((opt_flags & OP_ALLDIRS) && dp->dp_left) { 2253 syslog(LOG_ERR, "-alldirs has multiple directories"); 2254 return (1); 2255 } 2256 return (0); 2257 } 2258 2259 /* 2260 * Check an absolute directory path for any symbolic links. Return true 2261 */ 2262 int 2263 check_dirpath(char *dirp) 2264 { 2265 char *cp; 2266 int ret = 1; 2267 struct stat sb; 2268 2269 cp = dirp + 1; 2270 while (*cp && ret) { 2271 if (*cp == '/') { 2272 *cp = '\0'; 2273 if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode)) 2274 ret = 0; 2275 *cp = '/'; 2276 } 2277 cp++; 2278 } 2279 if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode)) 2280 ret = 0; 2281 return (ret); 2282 } 2283 2284 /* 2285 * Make a netmask according to the specified prefix length. The ss_family 2286 * and other non-address fields must be initialised before calling this. 2287 */ 2288 int 2289 makemask(struct sockaddr_storage *ssp, int bitlen) 2290 { 2291 u_char *p; 2292 int bits, i, len; 2293 2294 if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL) 2295 return (-1); 2296 if (bitlen > len * NBBY) 2297 return (-1); 2298 for (i = 0; i < len; i++) { 2299 bits = (bitlen > NBBY) ? NBBY : bitlen; 2300 *p++ = (1 << bits) - 1; 2301 bitlen -= bits; 2302 } 2303 return 0; 2304 } 2305 2306 /* 2307 * Check that the sockaddr is a valid netmask. Returns 0 if the mask 2308 * is acceptable (i.e. of the form 1...10....0). 2309 */ 2310 int 2311 checkmask(struct sockaddr *sa) 2312 { 2313 u_char *mask; 2314 int i, len; 2315 2316 if ((mask = sa_rawaddr(sa, &len)) == NULL) 2317 return (-1); 2318 2319 for (i = 0; i < len; i++) 2320 if (mask[i] != 0xff) 2321 break; 2322 if (i < len) { 2323 if (~mask[i] & (u_char)(~mask[i] + 1)) 2324 return (-1); 2325 i++; 2326 } 2327 for (; i < len; i++) 2328 if (mask[i] != 0) 2329 return (-1); 2330 return (0); 2331 } 2332 2333 /* 2334 * Compare two sockaddrs according to a specified mask. Return zero if 2335 * `sa1' matches `sa2' when filtered by the netmask in `samask'. 2336 * If samask is NULL, perform a full comparision. 2337 */ 2338 int 2339 sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask) 2340 { 2341 unsigned char *p1, *p2, *mask; 2342 int len, i; 2343 2344 if (sa1->sa_family != sa2->sa_family || 2345 (p1 = sa_rawaddr(sa1, &len)) == NULL || 2346 (p2 = sa_rawaddr(sa2, NULL)) == NULL) 2347 return (1); 2348 2349 switch (sa1->sa_family) { 2350 case AF_INET6: 2351 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id != 2352 ((struct sockaddr_in6 *)sa2)->sin6_scope_id) 2353 return (1); 2354 break; 2355 } 2356 2357 /* Simple binary comparison if no mask specified. */ 2358 if (samask == NULL) 2359 return (memcmp(p1, p2, len)); 2360 2361 /* Set up the mask, and do a mask-based comparison. */ 2362 if (sa1->sa_family != samask->sa_family || 2363 (mask = sa_rawaddr(samask, NULL)) == NULL) 2364 return (1); 2365 2366 for (i = 0; i < len; i++) 2367 if ((p1[i] & mask[i]) != (p2[i] & mask[i])) 2368 return (1); 2369 return (0); 2370 } 2371 2372 /* 2373 * Return a pointer to the part of the sockaddr that contains the 2374 * raw address, and set *nbytes to its length in bytes. Returns 2375 * NULL if the address family is unknown. 2376 */ 2377 void * 2378 sa_rawaddr(struct sockaddr *sa, int *nbytes) { 2379 void *p; 2380 int len; 2381 2382 switch (sa->sa_family) { 2383 case AF_INET: 2384 len = sizeof(((struct sockaddr_in *)sa)->sin_addr); 2385 p = &((struct sockaddr_in *)sa)->sin_addr; 2386 break; 2387 case AF_INET6: 2388 len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr); 2389 p = &((struct sockaddr_in6 *)sa)->sin6_addr; 2390 break; 2391 default: 2392 p = NULL; 2393 len = 0; 2394 } 2395 2396 if (nbytes != NULL) 2397 *nbytes = len; 2398 return (p); 2399 } 2400 2401 void 2402 huphandler(int sig) 2403 { 2404 got_sighup = 1; 2405 } 2406 2407 void terminate(int sig) 2408 { 2409 pidfile_remove(pfh); 2410 rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL); 2411 rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL); 2412 exit (0); 2413 } 2414