mountd.c revision 158857
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 * 4. 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 33#ifndef lint 34static const char copyright[] = 35"@(#) Copyright (c) 1989, 1993\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37#endif /*not lint*/ 38 39#if 0 40#ifndef lint 41static char sccsid[] = "@(#)mountd.c 8.15 (Berkeley) 5/1/95"; 42#endif /*not lint*/ 43#endif 44 45#include <sys/cdefs.h> 46__FBSDID("$FreeBSD: head/usr.sbin/mountd/mountd.c 158857 2006-05-23 17:10:17Z rodrigc $"); 47 48#include <sys/param.h> 49#include <sys/mount.h> 50#include <sys/fcntl.h> 51#include <sys/stat.h> 52#include <sys/syslog.h> 53#include <sys/sysctl.h> 54#include <sys/linker.h> 55#include <sys/module.h> 56 57#include <rpc/rpc.h> 58#include <rpc/rpc_com.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 66#include <arpa/inet.h> 67 68#include <ctype.h> 69#include <err.h> 70#include <errno.h> 71#include <grp.h> 72#include <libutil.h> 73#include <limits.h> 74#include <netdb.h> 75#include <pwd.h> 76#include <signal.h> 77#include <stdio.h> 78#include <stdlib.h> 79#include <string.h> 80#include <unistd.h> 81#include "pathnames.h" 82#include "mntopts.h" 83 84#ifdef DEBUG 85#include <stdarg.h> 86#endif 87 88/* 89 * Structures for keeping the mount list and export list 90 */ 91struct mountlist { 92 struct mountlist *ml_next; 93 char ml_host[RPCMNT_NAMELEN+1]; 94 char ml_dirp[RPCMNT_PATHLEN+1]; 95}; 96 97struct dirlist { 98 struct dirlist *dp_left; 99 struct dirlist *dp_right; 100 int dp_flag; 101 struct hostlist *dp_hosts; /* List of hosts this dir exported to */ 102 char dp_dirp[1]; /* Actually malloc'd to size of dir */ 103}; 104/* dp_flag bits */ 105#define DP_DEFSET 0x1 106#define DP_HOSTSET 0x2 107 108struct exportlist { 109 struct exportlist *ex_next; 110 struct dirlist *ex_dirl; 111 struct dirlist *ex_defdir; 112 int ex_flag; 113 fsid_t ex_fs; 114 char *ex_fsdir; 115 char *ex_indexfile; 116}; 117/* ex_flag bits */ 118#define EX_LINKED 0x1 119 120struct netmsk { 121 struct sockaddr_storage nt_net; 122 struct sockaddr_storage nt_mask; 123 char *nt_name; 124}; 125 126union grouptypes { 127 struct addrinfo *gt_addrinfo; 128 struct netmsk gt_net; 129}; 130 131struct grouplist { 132 int gr_type; 133 union grouptypes gr_ptr; 134 struct grouplist *gr_next; 135}; 136/* Group types */ 137#define GT_NULL 0x0 138#define GT_HOST 0x1 139#define GT_NET 0x2 140#define GT_DEFAULT 0x3 141#define GT_IGNORE 0x5 142 143struct hostlist { 144 int ht_flag; /* Uses DP_xx bits */ 145 struct grouplist *ht_grp; 146 struct hostlist *ht_next; 147}; 148 149struct fhreturn { 150 int fhr_flag; 151 int fhr_vers; 152 nfsfh_t fhr_fh; 153}; 154 155/* Global defs */ 156char *add_expdir(struct dirlist **, char *, int); 157void add_dlist(struct dirlist **, struct dirlist *, 158 struct grouplist *, int); 159void add_mlist(char *, char *); 160int check_dirpath(char *); 161int check_options(struct dirlist *); 162int checkmask(struct sockaddr *sa); 163int chk_host(struct dirlist *, struct sockaddr *, int *, int *); 164void del_mlist(char *hostp, char *dirp); 165struct dirlist *dirp_search(struct dirlist *, char *); 166int do_mount(struct exportlist *, struct grouplist *, int, 167 struct xucred *, char *, int, struct statfs *); 168int do_opt(char **, char **, struct exportlist *, struct grouplist *, 169 int *, int *, struct xucred *); 170struct exportlist *ex_search(fsid_t *); 171struct exportlist *get_exp(void); 172void free_dir(struct dirlist *); 173void free_exp(struct exportlist *); 174void free_grp(struct grouplist *); 175void free_host(struct hostlist *); 176void get_exportlist(void); 177int get_host(char *, struct grouplist *, struct grouplist *); 178struct hostlist *get_ht(void); 179int get_line(void); 180void get_mountlist(void); 181int get_net(char *, struct netmsk *, int); 182void getexp_err(struct exportlist *, struct grouplist *); 183struct grouplist *get_grp(void); 184void hang_dirp(struct dirlist *, struct grouplist *, 185 struct exportlist *, int); 186void huphandler(int sig); 187int makemask(struct sockaddr_storage *ssp, int bitlen); 188void mntsrv(struct svc_req *, SVCXPRT *); 189void nextfield(char **, char **); 190void out_of_mem(void); 191void parsecred(char *, struct xucred *); 192int put_exlist(struct dirlist *, XDR *, struct dirlist *, int *, int); 193void *sa_rawaddr(struct sockaddr *sa, int *nbytes); 194int sacmp(struct sockaddr *sa1, struct sockaddr *sa2, 195 struct sockaddr *samask); 196int scan_tree(struct dirlist *, struct sockaddr *); 197static void usage(void); 198int xdr_dir(XDR *, char *); 199int xdr_explist(XDR *, caddr_t); 200int xdr_explist_brief(XDR *, caddr_t); 201int xdr_fhs(XDR *, caddr_t); 202int xdr_mlist(XDR *, caddr_t); 203void terminate(int); 204 205struct exportlist *exphead; 206struct mountlist *mlhead; 207struct grouplist *grphead; 208char exname[MAXPATHLEN]; 209struct xucred def_anon = { 210 XUCRED_VERSION, 211 (uid_t)-2, 212 1, 213 { (gid_t)-2 }, 214 NULL 215}; 216int force_v2 = 0; 217int resvport_only = 1; 218int dir_only = 1; 219int dolog = 0; 220int got_sighup = 0; 221 222int opt_flags; 223static int have_v6 = 1; 224 225struct pidfh *pfh = NULL; 226/* Bits for opt_flags above */ 227#define OP_MAPROOT 0x01 228#define OP_MAPALL 0x02 229/* 0x4 free */ 230#define OP_MASK 0x08 231#define OP_NET 0x10 232#define OP_ALLDIRS 0x40 233#define OP_HAVEMASK 0x80 /* A mask was specified or inferred. */ 234#define OP_QUIET 0x100 235#define OP_MASKLEN 0x200 236 237#ifdef DEBUG 238int debug = 1; 239void SYSLOG(int, const char *, ...) __printflike(2, 3); 240#define syslog SYSLOG 241#else 242int debug = 0; 243#endif 244 245/* 246 * Mountd server for NFS mount protocol as described in: 247 * NFS: Network File System Protocol Specification, RFC1094, Appendix A 248 * The optional arguments are the exports file name 249 * default: _PATH_EXPORTS 250 * and "-n" to allow nonroot mount. 251 */ 252int 253main(argc, argv) 254 int argc; 255 char **argv; 256{ 257 fd_set readfds; 258 struct sockaddr_in sin; 259 struct sockaddr_in6 sin6; 260 char *endptr; 261 SVCXPRT *udptransp, *tcptransp, *udp6transp, *tcp6transp; 262 struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf; 263 pid_t otherpid; 264 int udpsock, tcpsock, udp6sock, tcp6sock; 265 int xcreated = 0, s; 266 int maxrec = RPC_MAXDATASIZE; 267 int one = 1; 268 int c, r; 269 in_port_t svcport = 0; 270 271 udp6conf = tcp6conf = NULL; 272 udp6sock = tcp6sock = 0; 273 274 /* Check that another mountd isn't already running. */ 275 pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &otherpid); 276 if (pfh == NULL) { 277 if (errno == EEXIST) 278 errx(1, "mountd already running, pid: %d.", otherpid); 279 warn("cannot open or create pidfile"); 280 } 281 282 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, "2dlnp:r")) != -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 dolog = 1; 309 break; 310 case 'p': 311 endptr = NULL; 312 svcport = (in_port_t)strtoul(optarg, &endptr, 10); 313 if (endptr == NULL || *endptr != '\0' || 314 svcport == 0 || svcport >= IPPORT_MAX) 315 usage(); 316 break; 317 default: 318 usage(); 319 }; 320 argc -= optind; 321 argv += optind; 322 grphead = (struct grouplist *)NULL; 323 exphead = (struct exportlist *)NULL; 324 mlhead = (struct mountlist *)NULL; 325 if (argc == 1) { 326 strncpy(exname, *argv, MAXPATHLEN-1); 327 exname[MAXPATHLEN-1] = '\0'; 328 } else 329 strcpy(exname, _PATH_EXPORTS); 330 openlog("mountd", LOG_PID, LOG_DAEMON); 331 if (debug) 332 warnx("getting export list"); 333 get_exportlist(); 334 if (debug) 335 warnx("getting mount list"); 336 get_mountlist(); 337 if (debug) 338 warnx("here we go"); 339 if (debug == 0) { 340 daemon(0, 0); 341 signal(SIGINT, SIG_IGN); 342 signal(SIGQUIT, SIG_IGN); 343 } 344 signal(SIGHUP, huphandler); 345 signal(SIGTERM, terminate); 346 347 pidfile_write(pfh); 348 349 rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL); 350 rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL); 351 udpsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); 352 tcpsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); 353 udpconf = getnetconfigent("udp"); 354 tcpconf = getnetconfigent("tcp"); 355 356 rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec); 357 358 if (!have_v6) 359 goto skip_v6; 360 udp6sock = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP); 361 tcp6sock = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP); 362 /* 363 * We're doing host-based access checks here, so don't allow 364 * v4-in-v6 to confuse things. The kernel will disable it 365 * by default on NFS sockets too. 366 */ 367 if (udp6sock != -1 && setsockopt(udp6sock, IPPROTO_IPV6, 368 IPV6_V6ONLY, &one, sizeof one) < 0) { 369 syslog(LOG_ERR, "can't disable v4-in-v6 on UDP socket"); 370 exit(1); 371 } 372 if (tcp6sock != -1 && setsockopt(tcp6sock, IPPROTO_IPV6, 373 IPV6_V6ONLY, &one, sizeof one) < 0) { 374 syslog(LOG_ERR, "can't disable v4-in-v6 on TCP socket"); 375 exit(1); 376 } 377 udp6conf = getnetconfigent("udp6"); 378 tcp6conf = getnetconfigent("tcp6"); 379 380skip_v6: 381 if (!resvport_only) { 382 if (sysctlbyname("vfs.nfsrv.nfs_privport", NULL, NULL, 383 &resvport_only, sizeof(resvport_only)) != 0 && 384 errno != ENOENT) { 385 syslog(LOG_ERR, "sysctl: %m"); 386 exit(1); 387 } 388 } 389 if (svcport != 0) { 390 bzero(&sin, sizeof(struct sockaddr_in)); 391 sin.sin_len = sizeof(struct sockaddr_in); 392 sin.sin_family = AF_INET; 393 sin.sin_port = htons(svcport); 394 395 bzero(&sin6, sizeof(struct sockaddr_in6)); 396 sin6.sin6_len = sizeof(struct sockaddr_in6); 397 sin6.sin6_family = AF_INET6; 398 sin6.sin6_port = htons(svcport); 399 } 400 if (udpsock != -1 && udpconf != NULL) { 401 if (svcport != 0) { 402 r = bindresvport(udpsock, &sin); 403 if (r != 0) { 404 syslog(LOG_ERR, "bindresvport: %m"); 405 exit(1); 406 } 407 } else 408 (void)bindresvport(udpsock, NULL); 409 udptransp = svc_dg_create(udpsock, 0, 0); 410 if (udptransp != NULL) { 411 if (!svc_reg(udptransp, RPCPROG_MNT, RPCMNT_VER1, 412 mntsrv, udpconf)) 413 syslog(LOG_WARNING, "can't register UDP RPCMNT_VER1 service"); 414 else 415 xcreated++; 416 if (!force_v2) { 417 if (!svc_reg(udptransp, RPCPROG_MNT, RPCMNT_VER3, 418 mntsrv, udpconf)) 419 syslog(LOG_WARNING, "can't register UDP RPCMNT_VER3 service"); 420 else 421 xcreated++; 422 } 423 } else 424 syslog(LOG_WARNING, "can't create UDP services"); 425 426 } 427 if (tcpsock != -1 && tcpconf != NULL) { 428 if (svcport != 0) { 429 r = bindresvport(tcpsock, &sin); 430 if (r != 0) { 431 syslog(LOG_ERR, "bindresvport: %m"); 432 exit(1); 433 } 434 } else 435 (void)bindresvport(tcpsock, NULL); 436 listen(tcpsock, SOMAXCONN); 437 tcptransp = svc_vc_create(tcpsock, RPC_MAXDATASIZE, RPC_MAXDATASIZE); 438 if (tcptransp != NULL) { 439 if (!svc_reg(tcptransp, RPCPROG_MNT, RPCMNT_VER1, 440 mntsrv, tcpconf)) 441 syslog(LOG_WARNING, "can't register TCP RPCMNT_VER1 service"); 442 else 443 xcreated++; 444 if (!force_v2) { 445 if (!svc_reg(tcptransp, RPCPROG_MNT, RPCMNT_VER3, 446 mntsrv, tcpconf)) 447 syslog(LOG_WARNING, "can't register TCP RPCMNT_VER3 service"); 448 else 449 xcreated++; 450 } 451 } else 452 syslog(LOG_WARNING, "can't create TCP service"); 453 454 } 455 if (have_v6 && udp6sock != -1 && udp6conf != NULL) { 456 if (svcport != 0) { 457 r = bindresvport_sa(udp6sock, 458 (struct sockaddr *)&sin6); 459 if (r != 0) { 460 syslog(LOG_ERR, "bindresvport_sa: %m"); 461 exit(1); 462 } 463 } else 464 (void)bindresvport_sa(udp6sock, NULL); 465 udp6transp = svc_dg_create(udp6sock, 0, 0); 466 if (udp6transp != NULL) { 467 if (!svc_reg(udp6transp, RPCPROG_MNT, RPCMNT_VER1, 468 mntsrv, udp6conf)) 469 syslog(LOG_WARNING, "can't register UDP6 RPCMNT_VER1 service"); 470 else 471 xcreated++; 472 if (!force_v2) { 473 if (!svc_reg(udp6transp, RPCPROG_MNT, RPCMNT_VER3, 474 mntsrv, udp6conf)) 475 syslog(LOG_WARNING, "can't register UDP6 RPCMNT_VER3 service"); 476 else 477 xcreated++; 478 } 479 } else 480 syslog(LOG_WARNING, "can't create UDP6 service"); 481 482 } 483 if (have_v6 && tcp6sock != -1 && tcp6conf != NULL) { 484 if (svcport != 0) { 485 r = bindresvport_sa(tcp6sock, 486 (struct sockaddr *)&sin6); 487 if (r != 0) { 488 syslog(LOG_ERR, "bindresvport_sa: %m"); 489 exit(1); 490 } 491 } else 492 (void)bindresvport_sa(tcp6sock, NULL); 493 listen(tcp6sock, SOMAXCONN); 494 tcp6transp = svc_vc_create(tcp6sock, RPC_MAXDATASIZE, RPC_MAXDATASIZE); 495 if (tcp6transp != NULL) { 496 if (!svc_reg(tcp6transp, RPCPROG_MNT, RPCMNT_VER1, 497 mntsrv, tcp6conf)) 498 syslog(LOG_WARNING, "can't register TCP6 RPCMNT_VER1 service"); 499 else 500 xcreated++; 501 if (!force_v2) { 502 if (!svc_reg(tcp6transp, RPCPROG_MNT, RPCMNT_VER3, 503 mntsrv, tcp6conf)) 504 syslog(LOG_WARNING, "can't register TCP6 RPCMNT_VER3 service"); 505 else 506 xcreated++; 507 } 508 } else 509 syslog(LOG_WARNING, "can't create TCP6 service"); 510 511 } 512 if (xcreated == 0) { 513 syslog(LOG_ERR, "could not create any services"); 514 exit(1); 515 } 516 517 /* Expand svc_run() here so that we can call get_exportlist(). */ 518 for (;;) { 519 if (got_sighup) { 520 get_exportlist(); 521 got_sighup = 0; 522 } 523 readfds = svc_fdset; 524 switch (select(svc_maxfd + 1, &readfds, NULL, NULL, NULL)) { 525 case -1: 526 if (errno == EINTR) 527 continue; 528 syslog(LOG_ERR, "mountd died: select: %m"); 529 exit(1); 530 case 0: 531 continue; 532 default: 533 svc_getreqset(&readfds); 534 } 535 } 536} 537 538static void 539usage() 540{ 541 fprintf(stderr, 542 "usage: mountd [-2] [-d] [-l] [-n] [-p <port>] [-r] " 543 "[export_file]\n"); 544 exit(1); 545} 546 547/* 548 * The mount rpc service 549 */ 550void 551mntsrv(rqstp, transp) 552 struct svc_req *rqstp; 553 SVCXPRT *transp; 554{ 555 struct exportlist *ep; 556 struct dirlist *dp; 557 struct fhreturn fhr; 558 struct stat stb; 559 struct statfs fsb; 560 char host[NI_MAXHOST], numerichost[NI_MAXHOST]; 561 int lookup_failed = 1; 562 struct sockaddr *saddr; 563 u_short sport; 564 char rpcpath[RPCMNT_PATHLEN + 1], dirpath[MAXPATHLEN]; 565 int bad = 0, defset, hostset; 566 sigset_t sighup_mask; 567 568 sigemptyset(&sighup_mask); 569 sigaddset(&sighup_mask, SIGHUP); 570 saddr = svc_getrpccaller(transp)->buf; 571 switch (saddr->sa_family) { 572 case AF_INET6: 573 sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port); 574 break; 575 case AF_INET: 576 sport = ntohs(((struct sockaddr_in *)saddr)->sin_port); 577 break; 578 default: 579 syslog(LOG_ERR, "request from unknown address family"); 580 return; 581 } 582 lookup_failed = getnameinfo(saddr, saddr->sa_len, host, sizeof host, 583 NULL, 0, 0); 584 getnameinfo(saddr, saddr->sa_len, numerichost, 585 sizeof numerichost, NULL, 0, NI_NUMERICHOST); 586 switch (rqstp->rq_proc) { 587 case NULLPROC: 588 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL)) 589 syslog(LOG_ERR, "can't send reply"); 590 return; 591 case RPCMNT_MOUNT: 592 if (sport >= IPPORT_RESERVED && resvport_only) { 593 syslog(LOG_NOTICE, 594 "mount request from %s from unprivileged port", 595 numerichost); 596 svcerr_weakauth(transp); 597 return; 598 } 599 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) { 600 syslog(LOG_NOTICE, "undecodable mount request from %s", 601 numerichost); 602 svcerr_decode(transp); 603 return; 604 } 605 606 /* 607 * Get the real pathname and make sure it is a directory 608 * or a regular file if the -r option was specified 609 * and it exists. 610 */ 611 if (realpath(rpcpath, dirpath) == NULL || 612 stat(dirpath, &stb) < 0 || 613 (!S_ISDIR(stb.st_mode) && 614 (dir_only || !S_ISREG(stb.st_mode))) || 615 statfs(dirpath, &fsb) < 0) { 616 chdir("/"); /* Just in case realpath doesn't */ 617 syslog(LOG_NOTICE, 618 "mount request from %s for non existent path %s", 619 numerichost, dirpath); 620 if (debug) 621 warnx("stat failed on %s", dirpath); 622 bad = ENOENT; /* We will send error reply later */ 623 } 624 625 /* Check in the exports list */ 626 sigprocmask(SIG_BLOCK, &sighup_mask, NULL); 627 ep = ex_search(&fsb.f_fsid); 628 hostset = defset = 0; 629 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset) || 630 ((dp = dirp_search(ep->ex_dirl, dirpath)) && 631 chk_host(dp, saddr, &defset, &hostset)) || 632 (defset && scan_tree(ep->ex_defdir, saddr) == 0 && 633 scan_tree(ep->ex_dirl, saddr) == 0))) { 634 if (bad) { 635 if (!svc_sendreply(transp, (xdrproc_t)xdr_long, 636 (caddr_t)&bad)) 637 syslog(LOG_ERR, "can't send reply"); 638 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 639 return; 640 } 641 if (hostset & DP_HOSTSET) 642 fhr.fhr_flag = hostset; 643 else 644 fhr.fhr_flag = defset; 645 fhr.fhr_vers = rqstp->rq_vers; 646 /* Get the file handle */ 647 memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t)); 648 if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) { 649 bad = errno; 650 syslog(LOG_ERR, "can't get fh for %s", dirpath); 651 if (!svc_sendreply(transp, (xdrproc_t)xdr_long, 652 (caddr_t)&bad)) 653 syslog(LOG_ERR, "can't send reply"); 654 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 655 return; 656 } 657 if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs, 658 (caddr_t)&fhr)) 659 syslog(LOG_ERR, "can't send reply"); 660 if (!lookup_failed) 661 add_mlist(host, dirpath); 662 else 663 add_mlist(numerichost, dirpath); 664 if (debug) 665 warnx("mount successful"); 666 if (dolog) 667 syslog(LOG_NOTICE, 668 "mount request succeeded from %s for %s", 669 numerichost, dirpath); 670 } else { 671 bad = EACCES; 672 syslog(LOG_NOTICE, 673 "mount request denied from %s for %s", 674 numerichost, dirpath); 675 } 676 677 if (bad && !svc_sendreply(transp, (xdrproc_t)xdr_long, 678 (caddr_t)&bad)) 679 syslog(LOG_ERR, "can't send reply"); 680 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 681 return; 682 case RPCMNT_DUMP: 683 if (!svc_sendreply(transp, (xdrproc_t)xdr_mlist, (caddr_t)NULL)) 684 syslog(LOG_ERR, "can't send reply"); 685 else if (dolog) 686 syslog(LOG_NOTICE, 687 "dump request succeeded from %s", 688 numerichost); 689 return; 690 case RPCMNT_UMOUNT: 691 if (sport >= IPPORT_RESERVED && resvport_only) { 692 syslog(LOG_NOTICE, 693 "umount request from %s from unprivileged port", 694 numerichost); 695 svcerr_weakauth(transp); 696 return; 697 } 698 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) { 699 syslog(LOG_NOTICE, "undecodable umount request from %s", 700 numerichost); 701 svcerr_decode(transp); 702 return; 703 } 704 if (realpath(rpcpath, dirpath) == NULL) { 705 syslog(LOG_NOTICE, "umount request from %s " 706 "for non existent path %s", 707 numerichost, dirpath); 708 } 709 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL)) 710 syslog(LOG_ERR, "can't send reply"); 711 if (!lookup_failed) 712 del_mlist(host, dirpath); 713 del_mlist(numerichost, dirpath); 714 if (dolog) 715 syslog(LOG_NOTICE, 716 "umount request succeeded from %s for %s", 717 numerichost, dirpath); 718 return; 719 case RPCMNT_UMNTALL: 720 if (sport >= IPPORT_RESERVED && resvport_only) { 721 syslog(LOG_NOTICE, 722 "umountall request from %s from unprivileged port", 723 numerichost); 724 svcerr_weakauth(transp); 725 return; 726 } 727 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL)) 728 syslog(LOG_ERR, "can't send reply"); 729 if (!lookup_failed) 730 del_mlist(host, NULL); 731 del_mlist(numerichost, NULL); 732 if (dolog) 733 syslog(LOG_NOTICE, 734 "umountall request succeeded from %s", 735 numerichost); 736 return; 737 case RPCMNT_EXPORT: 738 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, (caddr_t)NULL)) 739 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist_brief, 740 (caddr_t)NULL)) 741 syslog(LOG_ERR, "can't send reply"); 742 if (dolog) 743 syslog(LOG_NOTICE, 744 "export request succeeded from %s", 745 numerichost); 746 return; 747 default: 748 svcerr_noproc(transp); 749 return; 750 } 751} 752 753/* 754 * Xdr conversion for a dirpath string 755 */ 756int 757xdr_dir(xdrsp, dirp) 758 XDR *xdrsp; 759 char *dirp; 760{ 761 return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN)); 762} 763 764/* 765 * Xdr routine to generate file handle reply 766 */ 767int 768xdr_fhs(xdrsp, cp) 769 XDR *xdrsp; 770 caddr_t cp; 771{ 772 struct fhreturn *fhrp = (struct fhreturn *)cp; 773 u_long ok = 0, len, auth; 774 775 if (!xdr_long(xdrsp, &ok)) 776 return (0); 777 switch (fhrp->fhr_vers) { 778 case 1: 779 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH)); 780 case 3: 781 len = NFSX_V3FH; 782 if (!xdr_long(xdrsp, &len)) 783 return (0); 784 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len)) 785 return (0); 786 auth = RPCAUTH_UNIX; 787 len = 1; 788 if (!xdr_long(xdrsp, &len)) 789 return (0); 790 return (xdr_long(xdrsp, &auth)); 791 }; 792 return (0); 793} 794 795int 796xdr_mlist(xdrsp, cp) 797 XDR *xdrsp; 798 caddr_t cp; 799{ 800 struct mountlist *mlp; 801 int true = 1; 802 int false = 0; 803 char *strp; 804 805 mlp = mlhead; 806 while (mlp) { 807 if (!xdr_bool(xdrsp, &true)) 808 return (0); 809 strp = &mlp->ml_host[0]; 810 if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN)) 811 return (0); 812 strp = &mlp->ml_dirp[0]; 813 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN)) 814 return (0); 815 mlp = mlp->ml_next; 816 } 817 if (!xdr_bool(xdrsp, &false)) 818 return (0); 819 return (1); 820} 821 822/* 823 * Xdr conversion for export list 824 */ 825int 826xdr_explist_common(xdrsp, cp, brief) 827 XDR *xdrsp; 828 caddr_t cp; 829 int brief; 830{ 831 struct exportlist *ep; 832 int false = 0; 833 int putdef; 834 sigset_t sighup_mask; 835 836 sigemptyset(&sighup_mask); 837 sigaddset(&sighup_mask, SIGHUP); 838 sigprocmask(SIG_BLOCK, &sighup_mask, NULL); 839 ep = exphead; 840 while (ep) { 841 putdef = 0; 842 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir, 843 &putdef, brief)) 844 goto errout; 845 if (ep->ex_defdir && putdef == 0 && 846 put_exlist(ep->ex_defdir, xdrsp, (struct dirlist *)NULL, 847 &putdef, brief)) 848 goto errout; 849 ep = ep->ex_next; 850 } 851 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 852 if (!xdr_bool(xdrsp, &false)) 853 return (0); 854 return (1); 855errout: 856 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 857 return (0); 858} 859 860/* 861 * Called from xdr_explist() to traverse the tree and export the 862 * directory paths. 863 */ 864int 865put_exlist(dp, xdrsp, adp, putdefp, brief) 866 struct dirlist *dp; 867 XDR *xdrsp; 868 struct dirlist *adp; 869 int *putdefp; 870 int brief; 871{ 872 struct grouplist *grp; 873 struct hostlist *hp; 874 int true = 1; 875 int false = 0; 876 int gotalldir = 0; 877 char *strp; 878 879 if (dp) { 880 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp, brief)) 881 return (1); 882 if (!xdr_bool(xdrsp, &true)) 883 return (1); 884 strp = dp->dp_dirp; 885 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN)) 886 return (1); 887 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) { 888 gotalldir = 1; 889 *putdefp = 1; 890 } 891 if (brief) { 892 if (!xdr_bool(xdrsp, &true)) 893 return (1); 894 strp = "(...)"; 895 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN)) 896 return (1); 897 } else if ((dp->dp_flag & DP_DEFSET) == 0 && 898 (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) { 899 hp = dp->dp_hosts; 900 while (hp) { 901 grp = hp->ht_grp; 902 if (grp->gr_type == GT_HOST) { 903 if (!xdr_bool(xdrsp, &true)) 904 return (1); 905 strp = grp->gr_ptr.gt_addrinfo->ai_canonname; 906 if (!xdr_string(xdrsp, &strp, 907 RPCMNT_NAMELEN)) 908 return (1); 909 } else if (grp->gr_type == GT_NET) { 910 if (!xdr_bool(xdrsp, &true)) 911 return (1); 912 strp = grp->gr_ptr.gt_net.nt_name; 913 if (!xdr_string(xdrsp, &strp, 914 RPCMNT_NAMELEN)) 915 return (1); 916 } 917 hp = hp->ht_next; 918 if (gotalldir && hp == (struct hostlist *)NULL) { 919 hp = adp->dp_hosts; 920 gotalldir = 0; 921 } 922 } 923 } 924 if (!xdr_bool(xdrsp, &false)) 925 return (1); 926 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp, brief)) 927 return (1); 928 } 929 return (0); 930} 931 932int 933xdr_explist(xdrsp, cp) 934 XDR *xdrsp; 935 caddr_t cp; 936{ 937 938 return xdr_explist_common(xdrsp, cp, 0); 939} 940 941int 942xdr_explist_brief(xdrsp, cp) 943 XDR *xdrsp; 944 caddr_t cp; 945{ 946 947 return xdr_explist_common(xdrsp, cp, 1); 948} 949 950char *line; 951int linesize; 952FILE *exp_file; 953 954/* 955 * Get the export list 956 */ 957void 958get_exportlist() 959{ 960 struct exportlist *ep, *ep2; 961 struct grouplist *grp, *tgrp; 962 struct exportlist **epp; 963 struct export_args export; 964 struct dirlist *dirhead; 965 struct iovec *iov; 966 struct statfs fsb, *fsp; 967 struct xucred anon; 968 char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc; 969 char errmsg[255]; 970 int len, has_host, exflags, got_nondir, dirplen, num, i, netgrp; 971 int iovlen; 972 973 bzero(&export, sizeof(export)); 974 export.ex_flags = MNT_DELEXPORT; 975 dirp = NULL; 976 dirplen = 0; 977 iov = NULL; 978 iovlen = 0; 979 bzero(errmsg, sizeof(errmsg)); 980 981 /* 982 * First, get rid of the old list 983 */ 984 ep = exphead; 985 while (ep) { 986 ep2 = ep; 987 ep = ep->ex_next; 988 free_exp(ep2); 989 } 990 exphead = (struct exportlist *)NULL; 991 992 grp = grphead; 993 while (grp) { 994 tgrp = grp; 995 grp = grp->gr_next; 996 free_grp(tgrp); 997 } 998 grphead = (struct grouplist *)NULL; 999 1000 /* 1001 * And delete exports that are in the kernel for all local 1002 * filesystems. 1003 * XXX: Should know how to handle all local exportable filesystems 1004 * instead of just "ufs". 1005 */ 1006 num = getmntinfo(&fsp, MNT_NOWAIT); 1007 1008 if (num > 0) { 1009 build_iovec(&iov, &iovlen, "fstype", NULL, 0); 1010 build_iovec(&iov, &iovlen, "fspath", NULL, 0); 1011 build_iovec(&iov, &iovlen, "from", NULL, 0); 1012 build_iovec(&iov, &iovlen, "update", NULL, 0); 1013 build_iovec(&iov, &iovlen, "export", &export, sizeof(export)); 1014 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg)); 1015 } 1016 1017 for (i = 0; i < num; i++) { 1018 1019 if (!strcmp(fsp->f_fstypename, "ufs") || 1020 !strcmp(fsp->f_fstypename, "msdosfs") || 1021 !strcmp(fsp->f_fstypename, "ntfs") || 1022 !strcmp(fsp->f_fstypename, "cd9660")) { 1023 iov[1].iov_base = fsp->f_fstypename; 1024 iov[1].iov_len = strlen(fsp->f_fstypename) + 1; 1025 iov[3].iov_base = fsp->f_mntonname; 1026 iov[3].iov_len = strlen(fsp->f_mntonname) + 1; 1027 iov[5].iov_base = fsp->f_mntfromname; 1028 iov[5].iov_len = strlen(fsp->f_mntfromname) + 1; 1029 1030 /* 1031 * Kick out MNT_ROOTFS. It should not be passed from 1032 * userland to kernel. It should only be used 1033 * internally in the kernel. 1034 */ 1035 if (fsp->f_flags & MNT_ROOTFS) { 1036 fsp->f_flags &= ~MNT_ROOTFS; 1037 } 1038 1039 if (nmount(iov, iovlen, fsp->f_flags) < 0 && 1040 errno != ENOENT) { 1041 syslog(LOG_ERR, 1042 "can't delete exports for %s: %m %s", 1043 fsp->f_mntonname, errmsg); 1044 } 1045 } 1046 fsp++; 1047 } 1048 1049 if (iov != NULL) { 1050 /* Free strings allocated by strdup() in getmntopts.c */ 1051 free(iov[0].iov_base); /* fstype */ 1052 free(iov[2].iov_base); /* fspath */ 1053 free(iov[4].iov_base); /* from */ 1054 free(iov[6].iov_base); /* update */ 1055 free(iov[8].iov_base); /* export */ 1056 free(iov[10].iov_base); /* errmsg */ 1057 1058 /* free iov, allocated by realloc() */ 1059 free(iov); 1060 iovlen = 0; 1061 } 1062 1063 /* 1064 * Read in the exports file and build the list, calling 1065 * nmount() as we go along to push the export rules into the kernel. 1066 */ 1067 if ((exp_file = fopen(exname, "r")) == NULL) { 1068 syslog(LOG_ERR, "can't open %s", exname); 1069 exit(2); 1070 } 1071 dirhead = (struct dirlist *)NULL; 1072 while (get_line()) { 1073 if (debug) 1074 warnx("got line %s", line); 1075 cp = line; 1076 nextfield(&cp, &endcp); 1077 if (*cp == '#') 1078 goto nextline; 1079 1080 /* 1081 * Set defaults. 1082 */ 1083 has_host = FALSE; 1084 anon = def_anon; 1085 exflags = MNT_EXPORTED; 1086 got_nondir = 0; 1087 opt_flags = 0; 1088 ep = (struct exportlist *)NULL; 1089 1090 /* 1091 * Create new exports list entry 1092 */ 1093 len = endcp-cp; 1094 tgrp = grp = get_grp(); 1095 while (len > 0) { 1096 if (len > RPCMNT_NAMELEN) { 1097 getexp_err(ep, tgrp); 1098 goto nextline; 1099 } 1100 if (*cp == '-') { 1101 if (ep == (struct exportlist *)NULL) { 1102 getexp_err(ep, tgrp); 1103 goto nextline; 1104 } 1105 if (debug) 1106 warnx("doing opt %s", cp); 1107 got_nondir = 1; 1108 if (do_opt(&cp, &endcp, ep, grp, &has_host, 1109 &exflags, &anon)) { 1110 getexp_err(ep, tgrp); 1111 goto nextline; 1112 } 1113 } else if (*cp == '/') { 1114 savedc = *endcp; 1115 *endcp = '\0'; 1116 if (check_dirpath(cp) && 1117 statfs(cp, &fsb) >= 0) { 1118 if (got_nondir) { 1119 syslog(LOG_ERR, "dirs must be first"); 1120 getexp_err(ep, tgrp); 1121 goto nextline; 1122 } 1123 if (ep) { 1124 if (ep->ex_fs.val[0] != fsb.f_fsid.val[0] || 1125 ep->ex_fs.val[1] != fsb.f_fsid.val[1]) { 1126 getexp_err(ep, tgrp); 1127 goto nextline; 1128 } 1129 } else { 1130 /* 1131 * See if this directory is already 1132 * in the list. 1133 */ 1134 ep = ex_search(&fsb.f_fsid); 1135 if (ep == (struct exportlist *)NULL) { 1136 ep = get_exp(); 1137 ep->ex_fs = fsb.f_fsid; 1138 ep->ex_fsdir = (char *) 1139 malloc(strlen(fsb.f_mntonname) + 1); 1140 if (ep->ex_fsdir) 1141 strcpy(ep->ex_fsdir, 1142 fsb.f_mntonname); 1143 else 1144 out_of_mem(); 1145 if (debug) 1146 warnx("making new ep fs=0x%x,0x%x", 1147 fsb.f_fsid.val[0], 1148 fsb.f_fsid.val[1]); 1149 } else if (debug) 1150 warnx("found ep fs=0x%x,0x%x", 1151 fsb.f_fsid.val[0], 1152 fsb.f_fsid.val[1]); 1153 } 1154 1155 /* 1156 * Add dirpath to export mount point. 1157 */ 1158 dirp = add_expdir(&dirhead, cp, len); 1159 dirplen = len; 1160 } else { 1161 getexp_err(ep, tgrp); 1162 goto nextline; 1163 } 1164 *endcp = savedc; 1165 } else { 1166 savedc = *endcp; 1167 *endcp = '\0'; 1168 got_nondir = 1; 1169 if (ep == (struct exportlist *)NULL) { 1170 getexp_err(ep, tgrp); 1171 goto nextline; 1172 } 1173 1174 /* 1175 * Get the host or netgroup. 1176 */ 1177 setnetgrent(cp); 1178 netgrp = getnetgrent(&hst, &usr, &dom); 1179 do { 1180 if (has_host) { 1181 grp->gr_next = get_grp(); 1182 grp = grp->gr_next; 1183 } 1184 if (netgrp) { 1185 if (hst == 0) { 1186 syslog(LOG_ERR, 1187 "null hostname in netgroup %s, skipping", cp); 1188 grp->gr_type = GT_IGNORE; 1189 } else if (get_host(hst, grp, tgrp)) { 1190 syslog(LOG_ERR, 1191 "bad host %s in netgroup %s, skipping", hst, cp); 1192 grp->gr_type = GT_IGNORE; 1193 } 1194 } else if (get_host(cp, grp, tgrp)) { 1195 syslog(LOG_ERR, "bad host %s, skipping", cp); 1196 grp->gr_type = GT_IGNORE; 1197 } 1198 has_host = TRUE; 1199 } while (netgrp && getnetgrent(&hst, &usr, &dom)); 1200 endnetgrent(); 1201 *endcp = savedc; 1202 } 1203 cp = endcp; 1204 nextfield(&cp, &endcp); 1205 len = endcp - cp; 1206 } 1207 if (check_options(dirhead)) { 1208 getexp_err(ep, tgrp); 1209 goto nextline; 1210 } 1211 if (!has_host) { 1212 grp->gr_type = GT_DEFAULT; 1213 if (debug) 1214 warnx("adding a default entry"); 1215 1216 /* 1217 * Don't allow a network export coincide with a list of 1218 * host(s) on the same line. 1219 */ 1220 } else if ((opt_flags & OP_NET) && tgrp->gr_next) { 1221 syslog(LOG_ERR, "network/host conflict"); 1222 getexp_err(ep, tgrp); 1223 goto nextline; 1224 1225 /* 1226 * If an export list was specified on this line, make sure 1227 * that we have at least one valid entry, otherwise skip it. 1228 */ 1229 } else { 1230 grp = tgrp; 1231 while (grp && grp->gr_type == GT_IGNORE) 1232 grp = grp->gr_next; 1233 if (! grp) { 1234 getexp_err(ep, tgrp); 1235 goto nextline; 1236 } 1237 } 1238 1239 /* 1240 * Loop through hosts, pushing the exports into the kernel. 1241 * After loop, tgrp points to the start of the list and 1242 * grp points to the last entry in the list. 1243 */ 1244 grp = tgrp; 1245 do { 1246 if (do_mount(ep, grp, exflags, &anon, dirp, dirplen, 1247 &fsb)) { 1248 getexp_err(ep, tgrp); 1249 goto nextline; 1250 } 1251 } while (grp->gr_next && (grp = grp->gr_next)); 1252 1253 /* 1254 * Success. Update the data structures. 1255 */ 1256 if (has_host) { 1257 hang_dirp(dirhead, tgrp, ep, opt_flags); 1258 grp->gr_next = grphead; 1259 grphead = tgrp; 1260 } else { 1261 hang_dirp(dirhead, (struct grouplist *)NULL, ep, 1262 opt_flags); 1263 free_grp(grp); 1264 } 1265 dirhead = (struct dirlist *)NULL; 1266 if ((ep->ex_flag & EX_LINKED) == 0) { 1267 ep2 = exphead; 1268 epp = &exphead; 1269 1270 /* 1271 * Insert in the list in alphabetical order. 1272 */ 1273 while (ep2 && strcmp(ep2->ex_fsdir, ep->ex_fsdir) < 0) { 1274 epp = &ep2->ex_next; 1275 ep2 = ep2->ex_next; 1276 } 1277 if (ep2) 1278 ep->ex_next = ep2; 1279 *epp = ep; 1280 ep->ex_flag |= EX_LINKED; 1281 } 1282nextline: 1283 if (dirhead) { 1284 free_dir(dirhead); 1285 dirhead = (struct dirlist *)NULL; 1286 } 1287 } 1288 fclose(exp_file); 1289} 1290 1291/* 1292 * Allocate an export list element 1293 */ 1294struct exportlist * 1295get_exp() 1296{ 1297 struct exportlist *ep; 1298 1299 ep = (struct exportlist *)malloc(sizeof (struct exportlist)); 1300 if (ep == (struct exportlist *)NULL) 1301 out_of_mem(); 1302 memset(ep, 0, sizeof(struct exportlist)); 1303 return (ep); 1304} 1305 1306/* 1307 * Allocate a group list element 1308 */ 1309struct grouplist * 1310get_grp() 1311{ 1312 struct grouplist *gp; 1313 1314 gp = (struct grouplist *)malloc(sizeof (struct grouplist)); 1315 if (gp == (struct grouplist *)NULL) 1316 out_of_mem(); 1317 memset(gp, 0, sizeof(struct grouplist)); 1318 return (gp); 1319} 1320 1321/* 1322 * Clean up upon an error in get_exportlist(). 1323 */ 1324void 1325getexp_err(ep, grp) 1326 struct exportlist *ep; 1327 struct grouplist *grp; 1328{ 1329 struct grouplist *tgrp; 1330 1331 if (!(opt_flags & OP_QUIET)) 1332 syslog(LOG_ERR, "bad exports list line %s", line); 1333 if (ep && (ep->ex_flag & EX_LINKED) == 0) 1334 free_exp(ep); 1335 while (grp) { 1336 tgrp = grp; 1337 grp = grp->gr_next; 1338 free_grp(tgrp); 1339 } 1340} 1341 1342/* 1343 * Search the export list for a matching fs. 1344 */ 1345struct exportlist * 1346ex_search(fsid) 1347 fsid_t *fsid; 1348{ 1349 struct exportlist *ep; 1350 1351 ep = exphead; 1352 while (ep) { 1353 if (ep->ex_fs.val[0] == fsid->val[0] && 1354 ep->ex_fs.val[1] == fsid->val[1]) 1355 return (ep); 1356 ep = ep->ex_next; 1357 } 1358 return (ep); 1359} 1360 1361/* 1362 * Add a directory path to the list. 1363 */ 1364char * 1365add_expdir(dpp, cp, len) 1366 struct dirlist **dpp; 1367 char *cp; 1368 int len; 1369{ 1370 struct dirlist *dp; 1371 1372 dp = (struct dirlist *)malloc(sizeof (struct dirlist) + len); 1373 if (dp == (struct dirlist *)NULL) 1374 out_of_mem(); 1375 dp->dp_left = *dpp; 1376 dp->dp_right = (struct dirlist *)NULL; 1377 dp->dp_flag = 0; 1378 dp->dp_hosts = (struct hostlist *)NULL; 1379 strcpy(dp->dp_dirp, cp); 1380 *dpp = dp; 1381 return (dp->dp_dirp); 1382} 1383 1384/* 1385 * Hang the dir list element off the dirpath binary tree as required 1386 * and update the entry for host. 1387 */ 1388void 1389hang_dirp(dp, grp, ep, flags) 1390 struct dirlist *dp; 1391 struct grouplist *grp; 1392 struct exportlist *ep; 1393 int flags; 1394{ 1395 struct hostlist *hp; 1396 struct dirlist *dp2; 1397 1398 if (flags & OP_ALLDIRS) { 1399 if (ep->ex_defdir) 1400 free((caddr_t)dp); 1401 else 1402 ep->ex_defdir = dp; 1403 if (grp == (struct grouplist *)NULL) { 1404 ep->ex_defdir->dp_flag |= DP_DEFSET; 1405 } else while (grp) { 1406 hp = get_ht(); 1407 hp->ht_grp = grp; 1408 hp->ht_next = ep->ex_defdir->dp_hosts; 1409 ep->ex_defdir->dp_hosts = hp; 1410 grp = grp->gr_next; 1411 } 1412 } else { 1413 1414 /* 1415 * Loop through the directories adding them to the tree. 1416 */ 1417 while (dp) { 1418 dp2 = dp->dp_left; 1419 add_dlist(&ep->ex_dirl, dp, grp, flags); 1420 dp = dp2; 1421 } 1422 } 1423} 1424 1425/* 1426 * Traverse the binary tree either updating a node that is already there 1427 * for the new directory or adding the new node. 1428 */ 1429void 1430add_dlist(dpp, newdp, grp, flags) 1431 struct dirlist **dpp; 1432 struct dirlist *newdp; 1433 struct grouplist *grp; 1434 int flags; 1435{ 1436 struct dirlist *dp; 1437 struct hostlist *hp; 1438 int cmp; 1439 1440 dp = *dpp; 1441 if (dp) { 1442 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp); 1443 if (cmp > 0) { 1444 add_dlist(&dp->dp_left, newdp, grp, flags); 1445 return; 1446 } else if (cmp < 0) { 1447 add_dlist(&dp->dp_right, newdp, grp, flags); 1448 return; 1449 } else 1450 free((caddr_t)newdp); 1451 } else { 1452 dp = newdp; 1453 dp->dp_left = (struct dirlist *)NULL; 1454 *dpp = dp; 1455 } 1456 if (grp) { 1457 1458 /* 1459 * Hang all of the host(s) off of the directory point. 1460 */ 1461 do { 1462 hp = get_ht(); 1463 hp->ht_grp = grp; 1464 hp->ht_next = dp->dp_hosts; 1465 dp->dp_hosts = hp; 1466 grp = grp->gr_next; 1467 } while (grp); 1468 } else { 1469 dp->dp_flag |= DP_DEFSET; 1470 } 1471} 1472 1473/* 1474 * Search for a dirpath on the export point. 1475 */ 1476struct dirlist * 1477dirp_search(dp, dirp) 1478 struct dirlist *dp; 1479 char *dirp; 1480{ 1481 int cmp; 1482 1483 if (dp) { 1484 cmp = strcmp(dp->dp_dirp, dirp); 1485 if (cmp > 0) 1486 return (dirp_search(dp->dp_left, dirp)); 1487 else if (cmp < 0) 1488 return (dirp_search(dp->dp_right, dirp)); 1489 else 1490 return (dp); 1491 } 1492 return (dp); 1493} 1494 1495/* 1496 * Scan for a host match in a directory tree. 1497 */ 1498int 1499chk_host(dp, saddr, defsetp, hostsetp) 1500 struct dirlist *dp; 1501 struct sockaddr *saddr; 1502 int *defsetp; 1503 int *hostsetp; 1504{ 1505 struct hostlist *hp; 1506 struct grouplist *grp; 1507 struct addrinfo *ai; 1508 1509 if (dp) { 1510 if (dp->dp_flag & DP_DEFSET) 1511 *defsetp = dp->dp_flag; 1512 hp = dp->dp_hosts; 1513 while (hp) { 1514 grp = hp->ht_grp; 1515 switch (grp->gr_type) { 1516 case GT_HOST: 1517 ai = grp->gr_ptr.gt_addrinfo; 1518 for (; ai; ai = ai->ai_next) { 1519 if (!sacmp(ai->ai_addr, saddr, NULL)) { 1520 *hostsetp = 1521 (hp->ht_flag | DP_HOSTSET); 1522 return (1); 1523 } 1524 } 1525 break; 1526 case GT_NET: 1527 if (!sacmp(saddr, (struct sockaddr *) 1528 &grp->gr_ptr.gt_net.nt_net, 1529 (struct sockaddr *) 1530 &grp->gr_ptr.gt_net.nt_mask)) { 1531 *hostsetp = (hp->ht_flag | DP_HOSTSET); 1532 return (1); 1533 } 1534 break; 1535 } 1536 hp = hp->ht_next; 1537 } 1538 } 1539 return (0); 1540} 1541 1542/* 1543 * Scan tree for a host that matches the address. 1544 */ 1545int 1546scan_tree(dp, saddr) 1547 struct dirlist *dp; 1548 struct sockaddr *saddr; 1549{ 1550 int defset, hostset; 1551 1552 if (dp) { 1553 if (scan_tree(dp->dp_left, saddr)) 1554 return (1); 1555 if (chk_host(dp, saddr, &defset, &hostset)) 1556 return (1); 1557 if (scan_tree(dp->dp_right, saddr)) 1558 return (1); 1559 } 1560 return (0); 1561} 1562 1563/* 1564 * Traverse the dirlist tree and free it up. 1565 */ 1566void 1567free_dir(dp) 1568 struct dirlist *dp; 1569{ 1570 1571 if (dp) { 1572 free_dir(dp->dp_left); 1573 free_dir(dp->dp_right); 1574 free_host(dp->dp_hosts); 1575 free((caddr_t)dp); 1576 } 1577} 1578 1579/* 1580 * Parse the option string and update fields. 1581 * Option arguments may either be -<option>=<value> or 1582 * -<option> <value> 1583 */ 1584int 1585do_opt(cpp, endcpp, ep, grp, has_hostp, exflagsp, cr) 1586 char **cpp, **endcpp; 1587 struct exportlist *ep; 1588 struct grouplist *grp; 1589 int *has_hostp; 1590 int *exflagsp; 1591 struct xucred *cr; 1592{ 1593 char *cpoptarg, *cpoptend; 1594 char *cp, *endcp, *cpopt, savedc, savedc2; 1595 int allflag, usedarg; 1596 1597 savedc2 = '\0'; 1598 cpopt = *cpp; 1599 cpopt++; 1600 cp = *endcpp; 1601 savedc = *cp; 1602 *cp = '\0'; 1603 while (cpopt && *cpopt) { 1604 allflag = 1; 1605 usedarg = -2; 1606 if ((cpoptend = strchr(cpopt, ','))) { 1607 *cpoptend++ = '\0'; 1608 if ((cpoptarg = strchr(cpopt, '='))) 1609 *cpoptarg++ = '\0'; 1610 } else { 1611 if ((cpoptarg = strchr(cpopt, '='))) 1612 *cpoptarg++ = '\0'; 1613 else { 1614 *cp = savedc; 1615 nextfield(&cp, &endcp); 1616 **endcpp = '\0'; 1617 if (endcp > cp && *cp != '-') { 1618 cpoptarg = cp; 1619 savedc2 = *endcp; 1620 *endcp = '\0'; 1621 usedarg = 0; 1622 } 1623 } 1624 } 1625 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) { 1626 *exflagsp |= MNT_EXRDONLY; 1627 } else if (cpoptarg && (!strcmp(cpopt, "maproot") || 1628 !(allflag = strcmp(cpopt, "mapall")) || 1629 !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) { 1630 usedarg++; 1631 parsecred(cpoptarg, cr); 1632 if (allflag == 0) { 1633 *exflagsp |= MNT_EXPORTANON; 1634 opt_flags |= OP_MAPALL; 1635 } else 1636 opt_flags |= OP_MAPROOT; 1637 } else if (cpoptarg && (!strcmp(cpopt, "mask") || 1638 !strcmp(cpopt, "m"))) { 1639 if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) { 1640 syslog(LOG_ERR, "bad mask: %s", cpoptarg); 1641 return (1); 1642 } 1643 usedarg++; 1644 opt_flags |= OP_MASK; 1645 } else if (cpoptarg && (!strcmp(cpopt, "network") || 1646 !strcmp(cpopt, "n"))) { 1647 if (strchr(cpoptarg, '/') != NULL) { 1648 if (debug) 1649 fprintf(stderr, "setting OP_MASKLEN\n"); 1650 opt_flags |= OP_MASKLEN; 1651 } 1652 if (grp->gr_type != GT_NULL) { 1653 syslog(LOG_ERR, "network/host conflict"); 1654 return (1); 1655 } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) { 1656 syslog(LOG_ERR, "bad net: %s", cpoptarg); 1657 return (1); 1658 } 1659 grp->gr_type = GT_NET; 1660 *has_hostp = 1; 1661 usedarg++; 1662 opt_flags |= OP_NET; 1663 } else if (!strcmp(cpopt, "alldirs")) { 1664 opt_flags |= OP_ALLDIRS; 1665 } else if (!strcmp(cpopt, "public")) { 1666 *exflagsp |= MNT_EXPUBLIC; 1667 } else if (!strcmp(cpopt, "webnfs")) { 1668 *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON); 1669 opt_flags |= OP_MAPALL; 1670 } else if (cpoptarg && !strcmp(cpopt, "index")) { 1671 ep->ex_indexfile = strdup(cpoptarg); 1672 } else if (!strcmp(cpopt, "quiet")) { 1673 opt_flags |= OP_QUIET; 1674 } else { 1675 syslog(LOG_ERR, "bad opt %s", cpopt); 1676 return (1); 1677 } 1678 if (usedarg >= 0) { 1679 *endcp = savedc2; 1680 **endcpp = savedc; 1681 if (usedarg > 0) { 1682 *cpp = cp; 1683 *endcpp = endcp; 1684 } 1685 return (0); 1686 } 1687 cpopt = cpoptend; 1688 } 1689 **endcpp = savedc; 1690 return (0); 1691} 1692 1693/* 1694 * Translate a character string to the corresponding list of network 1695 * addresses for a hostname. 1696 */ 1697int 1698get_host(cp, grp, tgrp) 1699 char *cp; 1700 struct grouplist *grp; 1701 struct grouplist *tgrp; 1702{ 1703 struct grouplist *checkgrp; 1704 struct addrinfo *ai, *tai, hints; 1705 int ecode; 1706 char host[NI_MAXHOST]; 1707 1708 if (grp->gr_type != GT_NULL) { 1709 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp); 1710 return (1); 1711 } 1712 memset(&hints, 0, sizeof hints); 1713 hints.ai_flags = AI_CANONNAME; 1714 hints.ai_protocol = IPPROTO_UDP; 1715 ecode = getaddrinfo(cp, NULL, &hints, &ai); 1716 if (ecode != 0) { 1717 syslog(LOG_ERR,"can't get address info for host %s", cp); 1718 return 1; 1719 } 1720 grp->gr_ptr.gt_addrinfo = ai; 1721 while (ai != NULL) { 1722 if (ai->ai_canonname == NULL) { 1723 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host, 1724 sizeof host, NULL, 0, NI_NUMERICHOST) != 0) 1725 strlcpy(host, "?", sizeof(host)); 1726 ai->ai_canonname = strdup(host); 1727 ai->ai_flags |= AI_CANONNAME; 1728 } 1729 if (debug) 1730 fprintf(stderr, "got host %s\n", ai->ai_canonname); 1731 /* 1732 * Sanity check: make sure we don't already have an entry 1733 * for this host in the grouplist. 1734 */ 1735 for (checkgrp = tgrp; checkgrp != NULL; 1736 checkgrp = checkgrp->gr_next) { 1737 if (checkgrp->gr_type != GT_HOST) 1738 continue; 1739 for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL; 1740 tai = tai->ai_next) { 1741 if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0) 1742 continue; 1743 if (debug) 1744 fprintf(stderr, 1745 "ignoring duplicate host %s\n", 1746 ai->ai_canonname); 1747 grp->gr_type = GT_IGNORE; 1748 return (0); 1749 } 1750 } 1751 ai = ai->ai_next; 1752 } 1753 grp->gr_type = GT_HOST; 1754 return (0); 1755} 1756 1757/* 1758 * Free up an exports list component 1759 */ 1760void 1761free_exp(ep) 1762 struct exportlist *ep; 1763{ 1764 1765 if (ep->ex_defdir) { 1766 free_host(ep->ex_defdir->dp_hosts); 1767 free((caddr_t)ep->ex_defdir); 1768 } 1769 if (ep->ex_fsdir) 1770 free(ep->ex_fsdir); 1771 if (ep->ex_indexfile) 1772 free(ep->ex_indexfile); 1773 free_dir(ep->ex_dirl); 1774 free((caddr_t)ep); 1775} 1776 1777/* 1778 * Free hosts. 1779 */ 1780void 1781free_host(hp) 1782 struct hostlist *hp; 1783{ 1784 struct hostlist *hp2; 1785 1786 while (hp) { 1787 hp2 = hp; 1788 hp = hp->ht_next; 1789 free((caddr_t)hp2); 1790 } 1791} 1792 1793struct hostlist * 1794get_ht() 1795{ 1796 struct hostlist *hp; 1797 1798 hp = (struct hostlist *)malloc(sizeof (struct hostlist)); 1799 if (hp == (struct hostlist *)NULL) 1800 out_of_mem(); 1801 hp->ht_next = (struct hostlist *)NULL; 1802 hp->ht_flag = 0; 1803 return (hp); 1804} 1805 1806/* 1807 * Out of memory, fatal 1808 */ 1809void 1810out_of_mem() 1811{ 1812 1813 syslog(LOG_ERR, "out of memory"); 1814 exit(2); 1815} 1816 1817/* 1818 * Do the nmount() syscall with the update flag to push the export info into 1819 * the kernel. 1820 */ 1821int 1822do_mount(struct exportlist *ep, struct grouplist *grp, int exflags, 1823 struct xucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb) 1824{ 1825 struct statfs fsb1; 1826 struct addrinfo *ai; 1827 struct export_args eap; 1828 char errmsg[255]; 1829 char *cp; 1830 int done; 1831 char savedc; 1832 struct iovec *iov; 1833 int iovlen; 1834 int ret; 1835 1836 cp = NULL; 1837 savedc = '\0'; 1838 iov = NULL; 1839 iovlen = 0; 1840 ret = 0; 1841 1842 bzero(&eap, sizeof(eap)); 1843 bzero(errmsg, sizeof(errmsg)); 1844 eap.ex_flags = exflags; 1845 eap.ex_anon = *anoncrp; 1846 eap.ex_indexfile = ep->ex_indexfile; 1847 if (grp->gr_type == GT_HOST) 1848 ai = grp->gr_ptr.gt_addrinfo; 1849 else 1850 ai = NULL; 1851 done = FALSE; 1852 1853 build_iovec(&iov, &iovlen, "fstype", NULL, 0); 1854 build_iovec(&iov, &iovlen, "fspath", NULL, 0); 1855 build_iovec(&iov, &iovlen, "from", NULL, 0); 1856 build_iovec(&iov, &iovlen, "update", NULL, 0); 1857 build_iovec(&iov, &iovlen, "export", &eap, sizeof(eap)); 1858 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg)); 1859 1860 while (!done) { 1861 switch (grp->gr_type) { 1862 case GT_HOST: 1863 if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0) 1864 goto skip; 1865 eap.ex_addr = ai->ai_addr; 1866 eap.ex_addrlen = ai->ai_addrlen; 1867 eap.ex_masklen = 0; 1868 break; 1869 case GT_NET: 1870 if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 && 1871 have_v6 == 0) 1872 goto skip; 1873 eap.ex_addr = 1874 (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net; 1875 eap.ex_addrlen = 1876 ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_net)->sa_len; 1877 eap.ex_mask = 1878 (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask; 1879 eap.ex_masklen = ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask)->sa_len; 1880 break; 1881 case GT_DEFAULT: 1882 eap.ex_addr = NULL; 1883 eap.ex_addrlen = 0; 1884 eap.ex_mask = NULL; 1885 eap.ex_masklen = 0; 1886 break; 1887 case GT_IGNORE: 1888 ret = 0; 1889 goto error_exit; 1890 break; 1891 default: 1892 syslog(LOG_ERR, "bad grouptype"); 1893 if (cp) 1894 *cp = savedc; 1895 ret = 1; 1896 goto error_exit; 1897 }; 1898 1899 /* 1900 * XXX: 1901 * Maybe I should just use the fsb->f_mntonname path instead 1902 * of looping back up the dirp to the mount point?? 1903 * Also, needs to know how to export all types of local 1904 * exportable filesystems and not just "ufs". 1905 */ 1906 iov[1].iov_base = fsb->f_fstypename; /* "fstype" */ 1907 iov[1].iov_len = strlen(fsb->f_fstypename) + 1; 1908 iov[3].iov_base = fsb->f_mntonname; /* "fspath" */ 1909 iov[3].iov_len = strlen(fsb->f_mntonname) + 1; 1910 iov[5].iov_base = fsb->f_mntfromname; /* "from" */ 1911 iov[5].iov_len = strlen(fsb->f_mntfromname) + 1; 1912 1913 while (nmount(iov, iovlen, 0) < 0) { 1914 if (cp) 1915 *cp-- = savedc; 1916 else 1917 cp = dirp + dirplen - 1; 1918 if (opt_flags & OP_QUIET) { 1919 ret = 1; 1920 goto error_exit; 1921 } 1922 if (errno == EPERM) { 1923 if (debug) 1924 warnx("can't change attributes for %s", 1925 dirp); 1926 syslog(LOG_ERR, 1927 "can't change attributes for %s", dirp); 1928 ret = 1; 1929 goto error_exit; 1930 } 1931 if (opt_flags & OP_ALLDIRS) { 1932 if (errno == EINVAL) 1933 syslog(LOG_ERR, 1934 "-alldirs requested but %s is not a filesystem mountpoint", 1935 dirp); 1936 else 1937 syslog(LOG_ERR, 1938 "could not remount %s: %m", 1939 dirp); 1940 ret = 1; 1941 goto error_exit; 1942 } 1943 /* back up over the last component */ 1944 while (*cp == '/' && cp > dirp) 1945 cp--; 1946 while (*(cp - 1) != '/' && cp > dirp) 1947 cp--; 1948 if (cp == dirp) { 1949 if (debug) 1950 warnx("mnt unsucc"); 1951 syslog(LOG_ERR, "can't export %s", dirp); 1952 ret = 1; 1953 goto error_exit; 1954 } 1955 savedc = *cp; 1956 *cp = '\0'; 1957 /* Check that we're still on the same filesystem. */ 1958 if (statfs(dirp, &fsb1) != 0 || bcmp(&fsb1.f_fsid, 1959 &fsb->f_fsid, sizeof(fsb1.f_fsid)) != 0) { 1960 *cp = savedc; 1961 syslog(LOG_ERR, "can't export %s", dirp); 1962 ret = 1; 1963 goto error_exit; 1964 } 1965 } 1966skip: 1967 if (ai != NULL) 1968 ai = ai->ai_next; 1969 if (ai == NULL) 1970 done = TRUE; 1971 } 1972 if (cp) 1973 *cp = savedc; 1974error_exit: 1975 /* free strings allocated by strdup() in getmntopts.c */ 1976 if (iov != NULL) { 1977 free(iov[0].iov_base); /* fstype */ 1978 free(iov[2].iov_base); /* fspath */ 1979 free(iov[4].iov_base); /* from */ 1980 free(iov[6].iov_base); /* update */ 1981 free(iov[8].iov_base); /* export */ 1982 free(iov[10].iov_base); /* errmsg */ 1983 1984 /* free iov, allocated by realloc() */ 1985 free(iov); 1986 } 1987 return (ret); 1988} 1989 1990/* 1991 * Translate a net address. 1992 * 1993 * If `maskflg' is nonzero, then `cp' is a netmask, not a network address. 1994 */ 1995int 1996get_net(cp, net, maskflg) 1997 char *cp; 1998 struct netmsk *net; 1999 int maskflg; 2000{ 2001 struct netent *np = NULL; 2002 char *name, *p, *prefp; 2003 struct sockaddr_in sin; 2004 struct sockaddr *sa = NULL; 2005 struct addrinfo hints, *ai = NULL; 2006 char netname[NI_MAXHOST]; 2007 long preflen; 2008 2009 p = prefp = NULL; 2010 if ((opt_flags & OP_MASKLEN) && !maskflg) { 2011 p = strchr(cp, '/'); 2012 *p = '\0'; 2013 prefp = p + 1; 2014 } 2015 2016 /* 2017 * Check for a numeric address first. We wish to avoid 2018 * possible DNS lookups in getnetbyname(). 2019 */ 2020 if (isxdigit(*cp) || *cp == ':') { 2021 memset(&hints, 0, sizeof hints); 2022 /* Ensure the mask and the network have the same family. */ 2023 if (maskflg && (opt_flags & OP_NET)) 2024 hints.ai_family = net->nt_net.ss_family; 2025 else if (!maskflg && (opt_flags & OP_HAVEMASK)) 2026 hints.ai_family = net->nt_mask.ss_family; 2027 else 2028 hints.ai_family = AF_UNSPEC; 2029 hints.ai_flags = AI_NUMERICHOST; 2030 if (getaddrinfo(cp, NULL, &hints, &ai) == 0) 2031 sa = ai->ai_addr; 2032 if (sa != NULL && ai->ai_family == AF_INET) { 2033 /* 2034 * The address in `cp' is really a network address, so 2035 * use inet_network() to re-interpret this correctly. 2036 * e.g. "127.1" means 127.1.0.0, not 127.0.0.1. 2037 */ 2038 bzero(&sin, sizeof sin); 2039 sin.sin_family = AF_INET; 2040 sin.sin_len = sizeof sin; 2041 sin.sin_addr = inet_makeaddr(inet_network(cp), 0); 2042 if (debug) 2043 fprintf(stderr, "get_net: v4 addr %s\n", 2044 inet_ntoa(sin.sin_addr)); 2045 sa = (struct sockaddr *)&sin; 2046 } 2047 } 2048 if (sa == NULL && (np = getnetbyname(cp)) != NULL) { 2049 bzero(&sin, sizeof sin); 2050 sin.sin_family = AF_INET; 2051 sin.sin_len = sizeof sin; 2052 sin.sin_addr = inet_makeaddr(np->n_net, 0); 2053 sa = (struct sockaddr *)&sin; 2054 } 2055 if (sa == NULL) 2056 goto fail; 2057 2058 if (maskflg) { 2059 /* The specified sockaddr is a mask. */ 2060 if (checkmask(sa) != 0) 2061 goto fail; 2062 bcopy(sa, &net->nt_mask, sa->sa_len); 2063 opt_flags |= OP_HAVEMASK; 2064 } else { 2065 /* The specified sockaddr is a network address. */ 2066 bcopy(sa, &net->nt_net, sa->sa_len); 2067 2068 /* Get a network name for the export list. */ 2069 if (np) { 2070 name = np->n_name; 2071 } else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname, 2072 NULL, 0, NI_NUMERICHOST) == 0) { 2073 name = netname; 2074 } else { 2075 goto fail; 2076 } 2077 if ((net->nt_name = strdup(name)) == NULL) 2078 out_of_mem(); 2079 2080 /* 2081 * Extract a mask from either a "/<masklen>" suffix, or 2082 * from the class of an IPv4 address. 2083 */ 2084 if (opt_flags & OP_MASKLEN) { 2085 preflen = strtol(prefp, NULL, 10); 2086 if (preflen < 0L || preflen == LONG_MAX) 2087 goto fail; 2088 bcopy(sa, &net->nt_mask, sa->sa_len); 2089 if (makemask(&net->nt_mask, (int)preflen) != 0) 2090 goto fail; 2091 opt_flags |= OP_HAVEMASK; 2092 *p = '/'; 2093 } else if (sa->sa_family == AF_INET && 2094 (opt_flags & OP_MASK) == 0) { 2095 in_addr_t addr; 2096 2097 addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr; 2098 if (IN_CLASSA(addr)) 2099 preflen = 8; 2100 else if (IN_CLASSB(addr)) 2101 preflen = 16; 2102 else if (IN_CLASSC(addr)) 2103 preflen = 24; 2104 else if (IN_CLASSD(addr)) 2105 preflen = 28; 2106 else 2107 preflen = 32; /* XXX */ 2108 2109 bcopy(sa, &net->nt_mask, sa->sa_len); 2110 makemask(&net->nt_mask, (int)preflen); 2111 opt_flags |= OP_HAVEMASK; 2112 } 2113 } 2114 2115 if (ai) 2116 freeaddrinfo(ai); 2117 return 0; 2118 2119fail: 2120 if (ai) 2121 freeaddrinfo(ai); 2122 return 1; 2123} 2124 2125/* 2126 * Parse out the next white space separated field 2127 */ 2128void 2129nextfield(cp, endcp) 2130 char **cp; 2131 char **endcp; 2132{ 2133 char *p; 2134 2135 p = *cp; 2136 while (*p == ' ' || *p == '\t') 2137 p++; 2138 if (*p == '\n' || *p == '\0') 2139 *cp = *endcp = p; 2140 else { 2141 *cp = p++; 2142 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0') 2143 p++; 2144 *endcp = p; 2145 } 2146} 2147 2148/* 2149 * Get an exports file line. Skip over blank lines and handle line 2150 * continuations. 2151 */ 2152int 2153get_line() 2154{ 2155 char *p, *cp; 2156 size_t len; 2157 int totlen, cont_line; 2158 2159 /* 2160 * Loop around ignoring blank lines and getting all continuation lines. 2161 */ 2162 p = line; 2163 totlen = 0; 2164 do { 2165 if ((p = fgetln(exp_file, &len)) == NULL) 2166 return (0); 2167 cp = p + len - 1; 2168 cont_line = 0; 2169 while (cp >= p && 2170 (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) { 2171 if (*cp == '\\') 2172 cont_line = 1; 2173 cp--; 2174 len--; 2175 } 2176 if (cont_line) { 2177 *++cp = ' '; 2178 len++; 2179 } 2180 if (linesize < len + totlen + 1) { 2181 linesize = len + totlen + 1; 2182 line = realloc(line, linesize); 2183 if (line == NULL) 2184 out_of_mem(); 2185 } 2186 memcpy(line + totlen, p, len); 2187 totlen += len; 2188 line[totlen] = '\0'; 2189 } while (totlen == 0 || cont_line); 2190 return (1); 2191} 2192 2193/* 2194 * Parse a description of a credential. 2195 */ 2196void 2197parsecred(namelist, cr) 2198 char *namelist; 2199 struct xucred *cr; 2200{ 2201 char *name; 2202 int cnt; 2203 char *names; 2204 struct passwd *pw; 2205 struct group *gr; 2206 gid_t groups[NGROUPS + 1]; 2207 int ngroups; 2208 2209 cr->cr_version = XUCRED_VERSION; 2210 /* 2211 * Set up the unprivileged user. 2212 */ 2213 cr->cr_uid = -2; 2214 cr->cr_groups[0] = -2; 2215 cr->cr_ngroups = 1; 2216 /* 2217 * Get the user's password table entry. 2218 */ 2219 names = strsep(&namelist, " \t\n"); 2220 name = strsep(&names, ":"); 2221 if (isdigit(*name) || *name == '-') 2222 pw = getpwuid(atoi(name)); 2223 else 2224 pw = getpwnam(name); 2225 /* 2226 * Credentials specified as those of a user. 2227 */ 2228 if (names == NULL) { 2229 if (pw == NULL) { 2230 syslog(LOG_ERR, "unknown user: %s", name); 2231 return; 2232 } 2233 cr->cr_uid = pw->pw_uid; 2234 ngroups = NGROUPS + 1; 2235 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups)) 2236 syslog(LOG_ERR, "too many groups"); 2237 /* 2238 * Compress out duplicate. 2239 */ 2240 cr->cr_ngroups = ngroups - 1; 2241 cr->cr_groups[0] = groups[0]; 2242 for (cnt = 2; cnt < ngroups; cnt++) 2243 cr->cr_groups[cnt - 1] = groups[cnt]; 2244 return; 2245 } 2246 /* 2247 * Explicit credential specified as a colon separated list: 2248 * uid:gid:gid:... 2249 */ 2250 if (pw != NULL) 2251 cr->cr_uid = pw->pw_uid; 2252 else if (isdigit(*name) || *name == '-') 2253 cr->cr_uid = atoi(name); 2254 else { 2255 syslog(LOG_ERR, "unknown user: %s", name); 2256 return; 2257 } 2258 cr->cr_ngroups = 0; 2259 while (names != NULL && *names != '\0' && cr->cr_ngroups < NGROUPS) { 2260 name = strsep(&names, ":"); 2261 if (isdigit(*name) || *name == '-') { 2262 cr->cr_groups[cr->cr_ngroups++] = atoi(name); 2263 } else { 2264 if ((gr = getgrnam(name)) == NULL) { 2265 syslog(LOG_ERR, "unknown group: %s", name); 2266 continue; 2267 } 2268 cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid; 2269 } 2270 } 2271 if (names != NULL && *names != '\0' && cr->cr_ngroups == NGROUPS) 2272 syslog(LOG_ERR, "too many groups"); 2273} 2274 2275#define STRSIZ (RPCMNT_NAMELEN+RPCMNT_PATHLEN+50) 2276/* 2277 * Routines that maintain the remote mounttab 2278 */ 2279void 2280get_mountlist() 2281{ 2282 struct mountlist *mlp, **mlpp; 2283 char *host, *dirp, *cp; 2284 char str[STRSIZ]; 2285 FILE *mlfile; 2286 2287 if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) { 2288 if (errno == ENOENT) 2289 return; 2290 else { 2291 syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST); 2292 return; 2293 } 2294 } 2295 mlpp = &mlhead; 2296 while (fgets(str, STRSIZ, mlfile) != NULL) { 2297 cp = str; 2298 host = strsep(&cp, " \t\n"); 2299 dirp = strsep(&cp, " \t\n"); 2300 if (host == NULL || dirp == NULL) 2301 continue; 2302 mlp = (struct mountlist *)malloc(sizeof (*mlp)); 2303 if (mlp == (struct mountlist *)NULL) 2304 out_of_mem(); 2305 strncpy(mlp->ml_host, host, RPCMNT_NAMELEN); 2306 mlp->ml_host[RPCMNT_NAMELEN] = '\0'; 2307 strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN); 2308 mlp->ml_dirp[RPCMNT_PATHLEN] = '\0'; 2309 mlp->ml_next = (struct mountlist *)NULL; 2310 *mlpp = mlp; 2311 mlpp = &mlp->ml_next; 2312 } 2313 fclose(mlfile); 2314} 2315 2316void 2317del_mlist(char *hostp, char *dirp) 2318{ 2319 struct mountlist *mlp, **mlpp; 2320 struct mountlist *mlp2; 2321 FILE *mlfile; 2322 int fnd = 0; 2323 2324 mlpp = &mlhead; 2325 mlp = mlhead; 2326 while (mlp) { 2327 if (!strcmp(mlp->ml_host, hostp) && 2328 (!dirp || !strcmp(mlp->ml_dirp, dirp))) { 2329 fnd = 1; 2330 mlp2 = mlp; 2331 *mlpp = mlp = mlp->ml_next; 2332 free((caddr_t)mlp2); 2333 } else { 2334 mlpp = &mlp->ml_next; 2335 mlp = mlp->ml_next; 2336 } 2337 } 2338 if (fnd) { 2339 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) { 2340 syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST); 2341 return; 2342 } 2343 mlp = mlhead; 2344 while (mlp) { 2345 fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp); 2346 mlp = mlp->ml_next; 2347 } 2348 fclose(mlfile); 2349 } 2350} 2351 2352void 2353add_mlist(hostp, dirp) 2354 char *hostp, *dirp; 2355{ 2356 struct mountlist *mlp, **mlpp; 2357 FILE *mlfile; 2358 2359 mlpp = &mlhead; 2360 mlp = mlhead; 2361 while (mlp) { 2362 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp)) 2363 return; 2364 mlpp = &mlp->ml_next; 2365 mlp = mlp->ml_next; 2366 } 2367 mlp = (struct mountlist *)malloc(sizeof (*mlp)); 2368 if (mlp == (struct mountlist *)NULL) 2369 out_of_mem(); 2370 strncpy(mlp->ml_host, hostp, RPCMNT_NAMELEN); 2371 mlp->ml_host[RPCMNT_NAMELEN] = '\0'; 2372 strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN); 2373 mlp->ml_dirp[RPCMNT_PATHLEN] = '\0'; 2374 mlp->ml_next = (struct mountlist *)NULL; 2375 *mlpp = mlp; 2376 if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) { 2377 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST); 2378 return; 2379 } 2380 fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp); 2381 fclose(mlfile); 2382} 2383 2384/* 2385 * Free up a group list. 2386 */ 2387void 2388free_grp(grp) 2389 struct grouplist *grp; 2390{ 2391 if (grp->gr_type == GT_HOST) { 2392 if (grp->gr_ptr.gt_addrinfo != NULL) 2393 freeaddrinfo(grp->gr_ptr.gt_addrinfo); 2394 } else if (grp->gr_type == GT_NET) { 2395 if (grp->gr_ptr.gt_net.nt_name) 2396 free(grp->gr_ptr.gt_net.nt_name); 2397 } 2398 free((caddr_t)grp); 2399} 2400 2401#ifdef DEBUG 2402void 2403SYSLOG(int pri, const char *fmt, ...) 2404{ 2405 va_list ap; 2406 2407 va_start(ap, fmt); 2408 vfprintf(stderr, fmt, ap); 2409 va_end(ap); 2410} 2411#endif /* DEBUG */ 2412 2413/* 2414 * Check options for consistency. 2415 */ 2416int 2417check_options(dp) 2418 struct dirlist *dp; 2419{ 2420 2421 if (dp == (struct dirlist *)NULL) 2422 return (1); 2423 if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL)) { 2424 syslog(LOG_ERR, "-mapall and -maproot mutually exclusive"); 2425 return (1); 2426 } 2427 if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) { 2428 syslog(LOG_ERR, "-mask requires -network"); 2429 return (1); 2430 } 2431 if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) { 2432 syslog(LOG_ERR, "-network requires mask specification"); 2433 return (1); 2434 } 2435 if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) { 2436 syslog(LOG_ERR, "-mask and /masklen are mutually exclusive"); 2437 return (1); 2438 } 2439 if ((opt_flags & OP_ALLDIRS) && dp->dp_left) { 2440 syslog(LOG_ERR, "-alldirs has multiple directories"); 2441 return (1); 2442 } 2443 return (0); 2444} 2445 2446/* 2447 * Check an absolute directory path for any symbolic links. Return true 2448 */ 2449int 2450check_dirpath(dirp) 2451 char *dirp; 2452{ 2453 char *cp; 2454 int ret = 1; 2455 struct stat sb; 2456 2457 cp = dirp + 1; 2458 while (*cp && ret) { 2459 if (*cp == '/') { 2460 *cp = '\0'; 2461 if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode)) 2462 ret = 0; 2463 *cp = '/'; 2464 } 2465 cp++; 2466 } 2467 if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode)) 2468 ret = 0; 2469 return (ret); 2470} 2471 2472/* 2473 * Make a netmask according to the specified prefix length. The ss_family 2474 * and other non-address fields must be initialised before calling this. 2475 */ 2476int 2477makemask(struct sockaddr_storage *ssp, int bitlen) 2478{ 2479 u_char *p; 2480 int bits, i, len; 2481 2482 if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL) 2483 return (-1); 2484 if (bitlen > len * CHAR_BIT) 2485 return (-1); 2486 2487 for (i = 0; i < len; i++) { 2488 bits = (bitlen > CHAR_BIT) ? CHAR_BIT : bitlen; 2489 *p++ = (1 << bits) - 1; 2490 bitlen -= bits; 2491 } 2492 return 0; 2493} 2494 2495/* 2496 * Check that the sockaddr is a valid netmask. Returns 0 if the mask 2497 * is acceptable (i.e. of the form 1...10....0). 2498 */ 2499int 2500checkmask(struct sockaddr *sa) 2501{ 2502 u_char *mask; 2503 int i, len; 2504 2505 if ((mask = sa_rawaddr(sa, &len)) == NULL) 2506 return (-1); 2507 2508 for (i = 0; i < len; i++) 2509 if (mask[i] != 0xff) 2510 break; 2511 if (i < len) { 2512 if (~mask[i] & (u_char)(~mask[i] + 1)) 2513 return (-1); 2514 i++; 2515 } 2516 for (; i < len; i++) 2517 if (mask[i] != 0) 2518 return (-1); 2519 return (0); 2520} 2521 2522/* 2523 * Compare two sockaddrs according to a specified mask. Return zero if 2524 * `sa1' matches `sa2' when filtered by the netmask in `samask'. 2525 * If samask is NULL, perform a full comparision. 2526 */ 2527int 2528sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask) 2529{ 2530 unsigned char *p1, *p2, *mask; 2531 int len, i; 2532 2533 if (sa1->sa_family != sa2->sa_family || 2534 (p1 = sa_rawaddr(sa1, &len)) == NULL || 2535 (p2 = sa_rawaddr(sa2, NULL)) == NULL) 2536 return (1); 2537 2538 switch (sa1->sa_family) { 2539 case AF_INET6: 2540 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id != 2541 ((struct sockaddr_in6 *)sa2)->sin6_scope_id) 2542 return (1); 2543 break; 2544 } 2545 2546 /* Simple binary comparison if no mask specified. */ 2547 if (samask == NULL) 2548 return (memcmp(p1, p2, len)); 2549 2550 /* Set up the mask, and do a mask-based comparison. */ 2551 if (sa1->sa_family != samask->sa_family || 2552 (mask = sa_rawaddr(samask, NULL)) == NULL) 2553 return (1); 2554 2555 for (i = 0; i < len; i++) 2556 if ((p1[i] & mask[i]) != (p2[i] & mask[i])) 2557 return (1); 2558 return (0); 2559} 2560 2561/* 2562 * Return a pointer to the part of the sockaddr that contains the 2563 * raw address, and set *nbytes to its length in bytes. Returns 2564 * NULL if the address family is unknown. 2565 */ 2566void * 2567sa_rawaddr(struct sockaddr *sa, int *nbytes) { 2568 void *p; 2569 int len; 2570 2571 switch (sa->sa_family) { 2572 case AF_INET: 2573 len = sizeof(((struct sockaddr_in *)sa)->sin_addr); 2574 p = &((struct sockaddr_in *)sa)->sin_addr; 2575 break; 2576 case AF_INET6: 2577 len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr); 2578 p = &((struct sockaddr_in6 *)sa)->sin6_addr; 2579 break; 2580 default: 2581 p = NULL; 2582 len = 0; 2583 } 2584 2585 if (nbytes != NULL) 2586 *nbytes = len; 2587 return (p); 2588} 2589 2590void 2591huphandler(int sig) 2592{ 2593 got_sighup = 1; 2594} 2595 2596void terminate(sig) 2597int sig; 2598{ 2599 pidfile_remove(pfh); 2600 rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL); 2601 rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL); 2602 exit (0); 2603} 2604