1 /* $NetBSD: nfsd.c,v 1.52 2008/02/27 16:39:17 ad Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #ifndef lint 37 __COPYRIGHT("@(#) Copyright (c) 1989, 1993, 1994\n\ 38 The Regents of the University of California. All rights reserved.\n"); 39 #endif /* not lint */ 40 41 #ifndef lint 42 #if 0 43 static char sccsid[] = "@(#)nfsd.c 8.9 (Berkeley) 3/29/95"; 44 #else 45 __RCSID("$NetBSD: nfsd.c,v 1.52 2008/02/27 16:39:17 ad Exp $"); 46 #endif 47 #endif /* not lint */ 48 49 #include <sys/param.h> 50 #include <sys/ioctl.h> 51 #include <sys/stat.h> 52 #include <sys/wait.h> 53 #include <sys/uio.h> 54 #include <sys/ucred.h> 55 #include <sys/mount.h> 56 #include <sys/socket.h> 57 #include <sys/socketvar.h> 58 #include <poll.h> 59 60 #include <rpc/rpc.h> 61 #include <rpc/pmap_clnt.h> 62 #include <rpc/pmap_prot.h> 63 64 #include <nfs/rpcv2.h> 65 #include <nfs/nfsproto.h> 66 #include <nfs/nfs.h> 67 68 #include <err.h> 69 #include <errno.h> 70 #include <fcntl.h> 71 #include <grp.h> 72 #include <pwd.h> 73 #include <pthread.h> 74 #include <signal.h> 75 #include <stdio.h> 76 #include <stdlib.h> 77 #include <string.h> 78 #include <syslog.h> 79 #include <unistd.h> 80 #include <netdb.h> 81 82 /* Global defs */ 83 #ifdef DEBUG 84 #define syslog(e, s) fprintf(stderr,(s)) 85 int debug = 1; 86 #else 87 int debug = 0; 88 #endif 89 90 int main __P((int, char **)); 91 void nonfs __P((int)); 92 void usage __P((void)); 93 94 static void * 95 child(void *dummy) 96 { 97 struct nfsd_srvargs nsd; 98 int nfssvc_flag; 99 100 pthread_setname_np(pthread_self(), "slave", NULL); 101 nfssvc_flag = NFSSVC_NFSD; 102 memset(&nsd, 0, sizeof(nsd)); 103 while (nfssvc(nfssvc_flag, &nsd) < 0) { 104 if (errno != ENEEDAUTH) { 105 syslog(LOG_ERR, "nfssvc: %m"); 106 exit(1); 107 } 108 nfssvc_flag = NFSSVC_NFSD | NFSSVC_AUTHINFAIL; 109 } 110 111 return NULL; 112 } 113 114 /* 115 * Nfs server daemon mostly just a user context for nfssvc() 116 * 117 * 1 - do file descriptor and signal cleanup 118 * 2 - create the nfsd thread(s) 119 * 3 - create server socket(s) 120 * 4 - register socket with portmap 121 * 122 * For connectionless protocols, just pass the socket into the kernel via 123 * nfssvc(). 124 * For connection based sockets, loop doing accepts. When you get a new 125 * socket from accept, pass the msgsock into the kernel via nfssvc(). 126 * The arguments are: 127 * -c - support iso cltp clients 128 * -r - reregister with portmapper 129 * -t - support tcp nfs clients 130 * -u - support udp nfs clients 131 * followed by "n" which is the number of nfsd threads to create 132 */ 133 int 134 main(argc, argv) 135 int argc; 136 char *argv[]; 137 { 138 struct nfsd_args nfsdargs; 139 struct addrinfo *ai_udp, *ai_tcp, *ai_udp6, *ai_tcp6, hints; 140 struct netconfig *nconf_udp, *nconf_tcp, *nconf_udp6, *nconf_tcp6; 141 struct netbuf nb_udp, nb_tcp, nb_udp6, nb_tcp6; 142 struct sockaddr_in inetpeer; 143 struct sockaddr_in6 inet6peer; 144 struct pollfd set[4]; 145 socklen_t len; 146 int ch, cltpflag, connect_type_cnt, i, maxsock, msgsock; 147 int nfsdcnt, on = 1, reregister, sock, tcpflag, tcpsock; 148 int tcp6sock, ip6flag; 149 int tp4cnt, tp4flag, tpipcnt, tpipflag, udpflag, ecode, s; 150 151 #define MAXNFSDCNT 1024 152 #define DEFNFSDCNT 4 153 nfsdcnt = DEFNFSDCNT; 154 cltpflag = reregister = tcpflag = tp4cnt = tp4flag = tpipcnt = 0; 155 tpipflag = udpflag = ip6flag = 0; 156 nconf_udp = nconf_tcp = nconf_udp6 = nconf_tcp6 = NULL; 157 maxsock = 0; 158 tcpsock = tcp6sock = -1; 159 #define GETOPT "6n:rtu" 160 #define USAGE "[-rtu] [-n num_servers]" 161 while ((ch = getopt(argc, argv, GETOPT)) != -1) { 162 switch (ch) { 163 case '6': 164 ip6flag = 1; 165 s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP); 166 if (s < 0 && (errno == EPROTONOSUPPORT || 167 errno == EPFNOSUPPORT || errno == EAFNOSUPPORT)) 168 ip6flag = 0; 169 else 170 close(s); 171 break; 172 case 'n': 173 nfsdcnt = atoi(optarg); 174 if (nfsdcnt < 1 || nfsdcnt > MAXNFSDCNT) { 175 warnx("nfsd count %d; reset to %d", nfsdcnt, DEFNFSDCNT); 176 nfsdcnt = DEFNFSDCNT; 177 } 178 break; 179 case 'r': 180 reregister = 1; 181 break; 182 case 't': 183 tcpflag = 1; 184 break; 185 case 'u': 186 udpflag = 1; 187 break; 188 default: 189 case '?': 190 usage(); 191 }; 192 } 193 argv += optind; 194 argc -= optind; 195 196 /* 197 * XXX 198 * Backward compatibility, trailing number is the count of daemons. 199 */ 200 if (argc > 1) 201 usage(); 202 if (argc == 1) { 203 nfsdcnt = atoi(argv[0]); 204 if (nfsdcnt < 1 || nfsdcnt > MAXNFSDCNT) { 205 warnx("nfsd count %d; reset to %d", nfsdcnt, DEFNFSDCNT); 206 nfsdcnt = DEFNFSDCNT; 207 } 208 } 209 210 /* 211 * If none of TCP or UDP are specified, default to UDP only. 212 */ 213 if (tcpflag == 0 && udpflag == 0) 214 udpflag = 1; 215 216 if (debug == 0) { 217 daemon(0, 0); 218 (void)signal(SIGHUP, SIG_IGN); 219 (void)signal(SIGINT, SIG_IGN); 220 (void)signal(SIGQUIT, SIG_IGN); 221 (void)signal(SIGSYS, nonfs); 222 } 223 224 if (udpflag) { 225 memset(&hints, 0, sizeof hints); 226 hints.ai_flags = AI_PASSIVE; 227 hints.ai_family = PF_INET; 228 hints.ai_socktype = SOCK_DGRAM; 229 hints.ai_protocol = IPPROTO_UDP; 230 231 ecode = getaddrinfo(NULL, "nfs", &hints, &ai_udp); 232 if (ecode != 0) { 233 syslog(LOG_ERR, "getaddrinfo udp: %s", 234 gai_strerror(ecode)); 235 exit(1); 236 } 237 238 nconf_udp = getnetconfigent("udp"); 239 240 if (nconf_udp == NULL) 241 err(1, "getnetconfigent udp failed"); 242 243 nb_udp.buf = ai_udp->ai_addr; 244 nb_udp.len = nb_udp.maxlen = ai_udp->ai_addrlen; 245 if (reregister) 246 if (!rpcb_set(RPCPROG_NFS, 2, nconf_udp, &nb_udp)) 247 err(1, "rpcb_set udp failed"); 248 } 249 250 if (tcpflag) { 251 memset(&hints, 0, sizeof hints); 252 hints.ai_flags = AI_PASSIVE; 253 hints.ai_family = PF_INET; 254 hints.ai_socktype = SOCK_STREAM; 255 hints.ai_protocol = IPPROTO_TCP; 256 257 ecode = getaddrinfo(NULL, "nfs", &hints, &ai_tcp); 258 if (ecode != 0) { 259 syslog(LOG_ERR, "getaddrinfo tcp: %s", 260 gai_strerror(ecode)); 261 exit(1); 262 } 263 264 nconf_tcp = getnetconfigent("tcp"); 265 266 if (nconf_tcp == NULL) 267 err(1, "getnetconfigent tcp failed"); 268 269 nb_tcp.buf = ai_tcp->ai_addr; 270 nb_tcp.len = nb_tcp.maxlen = ai_tcp->ai_addrlen; 271 if (reregister) 272 if (!rpcb_set(RPCPROG_NFS, 2, nconf_tcp, &nb_tcp)) 273 err(1, "rpcb_set tcp failed"); 274 } 275 276 if (udpflag && ip6flag) { 277 memset(&hints, 0, sizeof hints); 278 hints.ai_flags = AI_PASSIVE; 279 hints.ai_family = PF_INET6; 280 hints.ai_socktype = SOCK_DGRAM; 281 hints.ai_protocol = IPPROTO_UDP; 282 283 ecode = getaddrinfo(NULL, "nfs", &hints, &ai_udp6); 284 if (ecode != 0) { 285 syslog(LOG_ERR, "getaddrinfo udp: %s", 286 gai_strerror(ecode)); 287 exit(1); 288 } 289 290 nconf_udp6 = getnetconfigent("udp6"); 291 292 if (nconf_udp6 == NULL) 293 err(1, "getnetconfigent udp6 failed"); 294 295 nb_udp6.buf = ai_udp6->ai_addr; 296 nb_udp6.len = nb_udp6.maxlen = ai_udp6->ai_addrlen; 297 if (reregister) 298 if (!rpcb_set(RPCPROG_NFS, 2, nconf_udp6, &nb_udp6)) 299 err(1, "rpcb_set udp6 failed"); 300 } 301 302 if (tcpflag && ip6flag) { 303 memset(&hints, 0, sizeof hints); 304 hints.ai_flags = AI_PASSIVE; 305 hints.ai_family = PF_INET6; 306 hints.ai_socktype = SOCK_STREAM; 307 hints.ai_protocol = IPPROTO_TCP; 308 309 ecode = getaddrinfo(NULL, "nfs", &hints, &ai_tcp6); 310 if (ecode != 0) { 311 syslog(LOG_ERR, "getaddrinfo tcp: %s", 312 gai_strerror(ecode)); 313 exit(1); 314 } 315 316 nconf_tcp6 = getnetconfigent("tcp6"); 317 318 if (nconf_tcp6 == NULL) 319 err(1, "getnetconfigent tcp6 failed"); 320 321 nb_tcp6.buf = ai_tcp6->ai_addr; 322 nb_tcp6.len = nb_tcp6.maxlen = ai_tcp6->ai_addrlen; 323 if (reregister) 324 if (!rpcb_set(RPCPROG_NFS, 2, nconf_tcp6, &nb_tcp6)) 325 err(1, "rpcb_set tcp6 failed"); 326 } 327 328 openlog("nfsd", LOG_PID, LOG_DAEMON); 329 330 for (i = 0; i < nfsdcnt; i++) { 331 pthread_t t; 332 int error; 333 334 error = pthread_create(&t, NULL, child, NULL); 335 if (error) { 336 errno = error; 337 syslog(LOG_ERR, "pthread_create: %m"); 338 exit (1); 339 } 340 } 341 342 /* If we are serving udp, set up the socket. */ 343 if (udpflag) { 344 if ((sock = socket(ai_udp->ai_family, ai_udp->ai_socktype, 345 ai_udp->ai_protocol)) < 0) { 346 syslog(LOG_ERR, "can't create udp socket"); 347 exit(1); 348 } 349 if (bind(sock, ai_udp->ai_addr, ai_udp->ai_addrlen) < 0) { 350 syslog(LOG_ERR, "can't bind udp addr"); 351 exit(1); 352 } 353 if (!rpcb_set(RPCPROG_NFS, 2, nconf_udp, &nb_udp) || 354 !rpcb_set(RPCPROG_NFS, 3, nconf_udp, &nb_udp)) { 355 syslog(LOG_ERR, "can't register with udp portmap"); 356 exit(1); 357 } 358 nfsdargs.sock = sock; 359 nfsdargs.name = NULL; 360 nfsdargs.namelen = 0; 361 if (nfssvc(NFSSVC_ADDSOCK, &nfsdargs) < 0) { 362 syslog(LOG_ERR, "can't add UDP socket"); 363 exit(1); 364 } 365 (void)close(sock); 366 } 367 368 if (udpflag &&ip6flag) { 369 if ((sock = socket(ai_udp6->ai_family, ai_udp6->ai_socktype, 370 ai_udp6->ai_protocol)) < 0) { 371 syslog(LOG_ERR, "can't create udp socket"); 372 exit(1); 373 } 374 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, 375 &on, sizeof on) < 0) { 376 syslog(LOG_ERR, "can't set v6-only binding for udp6 " 377 "socket: %m"); 378 exit(1); 379 } 380 if (bind(sock, ai_udp6->ai_addr, ai_udp6->ai_addrlen) < 0) { 381 syslog(LOG_ERR, "can't bind udp addr"); 382 exit(1); 383 } 384 if (!rpcb_set(RPCPROG_NFS, 2, nconf_udp6, &nb_udp6) || 385 !rpcb_set(RPCPROG_NFS, 3, nconf_udp6, &nb_udp6)) { 386 syslog(LOG_ERR, "can't register with udp portmap"); 387 exit(1); 388 } 389 nfsdargs.sock = sock; 390 nfsdargs.name = NULL; 391 nfsdargs.namelen = 0; 392 if (nfssvc(NFSSVC_ADDSOCK, &nfsdargs) < 0) { 393 syslog(LOG_ERR, "can't add UDP6 socket"); 394 exit(1); 395 } 396 (void)close(sock); 397 } 398 399 /* Now set up the master server socket waiting for tcp connections. */ 400 on = 1; 401 connect_type_cnt = 0; 402 if (tcpflag) { 403 if ((tcpsock = socket(ai_tcp->ai_family, ai_tcp->ai_socktype, 404 ai_tcp->ai_protocol)) < 0) { 405 syslog(LOG_ERR, "can't create tcp socket"); 406 exit(1); 407 } 408 if (setsockopt(tcpsock, 409 SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) < 0) 410 syslog(LOG_ERR, "setsockopt SO_REUSEADDR: %m"); 411 if (bind(tcpsock, ai_tcp->ai_addr, ai_tcp->ai_addrlen) < 0) { 412 syslog(LOG_ERR, "can't bind tcp addr"); 413 exit(1); 414 } 415 if (listen(tcpsock, 5) < 0) { 416 syslog(LOG_ERR, "listen failed"); 417 exit(1); 418 } 419 if (!rpcb_set(RPCPROG_NFS, 2, nconf_tcp, &nb_tcp) || 420 !rpcb_set(RPCPROG_NFS, 3, nconf_tcp, &nb_tcp)) { 421 syslog(LOG_ERR, "can't register tcp with rpcbind"); 422 exit(1); 423 } 424 set[0].fd = tcpsock; 425 set[0].events = POLLIN; 426 connect_type_cnt++; 427 } else 428 set[0].fd = -1; 429 430 if (tcpflag && ip6flag) { 431 if ((tcp6sock = socket(ai_tcp6->ai_family, ai_tcp6->ai_socktype, 432 ai_tcp6->ai_protocol)) < 0) { 433 syslog(LOG_ERR, "can't create tcp socket"); 434 exit(1); 435 } 436 if (setsockopt(tcp6sock, 437 SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) < 0) 438 syslog(LOG_ERR, "setsockopt SO_REUSEADDR: %m"); 439 if (setsockopt(tcp6sock, IPPROTO_IPV6, IPV6_V6ONLY, 440 &on, sizeof on) < 0) { 441 syslog(LOG_ERR, "can't set v6-only binding for tcp6 " 442 "socket: %m"); 443 exit(1); 444 } 445 if (bind(tcp6sock, ai_tcp6->ai_addr, ai_tcp6->ai_addrlen) < 0) { 446 syslog(LOG_ERR, "can't bind tcp6 addr"); 447 exit(1); 448 } 449 if (listen(tcp6sock, 5) < 0) { 450 syslog(LOG_ERR, "listen failed"); 451 exit(1); 452 } 453 if (!rpcb_set(RPCPROG_NFS, 2, nconf_tcp6, &nb_tcp6) || 454 !rpcb_set(RPCPROG_NFS, 3, nconf_tcp6, &nb_tcp6)) { 455 syslog(LOG_ERR, "can't register tcp6 with rpcbind"); 456 exit(1); 457 } 458 set[1].fd = tcp6sock; 459 set[1].events = POLLIN; 460 connect_type_cnt++; 461 } else 462 set[1].fd = -1; 463 464 set[2].fd = -1; 465 set[3].fd = -1; 466 467 if (connect_type_cnt == 0) 468 exit(0); 469 470 pthread_setname_np(pthread_self(), "master", NULL); 471 472 /* 473 * Loop forever accepting connections and passing the sockets 474 * into the kernel for the mounts. 475 */ 476 for (;;) { 477 if (poll(set, 4, INFTIM) < 1) { 478 syslog(LOG_ERR, "poll failed: %m"); 479 exit(1); 480 } 481 482 if (set[0].revents & POLLIN) { 483 len = sizeof(inetpeer); 484 if ((msgsock = accept(tcpsock, 485 (struct sockaddr *)&inetpeer, &len)) < 0) { 486 syslog(LOG_ERR, "accept failed: %m"); 487 exit(1); 488 } 489 memset(inetpeer.sin_zero, 0, sizeof(inetpeer.sin_zero)); 490 if (setsockopt(msgsock, SOL_SOCKET, 491 SO_KEEPALIVE, (char *)&on, sizeof(on)) < 0) 492 syslog(LOG_ERR, 493 "setsockopt SO_KEEPALIVE: %m"); 494 nfsdargs.sock = msgsock; 495 nfsdargs.name = (caddr_t)&inetpeer; 496 nfsdargs.namelen = sizeof(inetpeer); 497 nfssvc(NFSSVC_ADDSOCK, &nfsdargs); 498 (void)close(msgsock); 499 } 500 501 if (set[1].revents & POLLIN) { 502 len = sizeof(inet6peer); 503 if ((msgsock = accept(tcp6sock, 504 (struct sockaddr *)&inet6peer, &len)) < 0) { 505 syslog(LOG_ERR, "accept failed: %m"); 506 exit(1); 507 } 508 if (setsockopt(msgsock, SOL_SOCKET, 509 SO_KEEPALIVE, (char *)&on, sizeof(on)) < 0) 510 syslog(LOG_ERR, 511 "setsockopt SO_KEEPALIVE: %m"); 512 nfsdargs.sock = msgsock; 513 nfsdargs.name = (caddr_t)&inet6peer; 514 nfsdargs.namelen = sizeof(inet6peer); 515 nfssvc(NFSSVC_ADDSOCK, &nfsdargs); 516 (void)close(msgsock); 517 } 518 519 #ifdef notyet 520 if (set[2].revents & POLLIN) { 521 len = sizeof(isopeer); 522 if ((msgsock = accept(tp4sock, 523 (struct sockaddr *)&isopeer, &len)) < 0) { 524 syslog(LOG_ERR, "accept failed: %m"); 525 exit(1); 526 } 527 if (setsockopt(msgsock, SOL_SOCKET, 528 SO_KEEPALIVE, (char *)&on, sizeof(on)) < 0) 529 syslog(LOG_ERR, 530 "setsockopt SO_KEEPALIVE: %m"); 531 nfsdargs.sock = msgsock; 532 nfsdargs.name = (caddr_t)&isopeer; 533 nfsdargs.namelen = len; 534 nfssvc(NFSSVC_ADDSOCK, &nfsdargs); 535 (void)close(msgsock); 536 } 537 538 if (set[3].revents & POLLIN) { 539 len = sizeof(inetpeer); 540 if ((msgsock = accept(tpipsock, 541 (struct sockaddr *)&inetpeer, &len)) < 0) { 542 syslog(LOG_ERR, "accept failed: %m"); 543 exit(1); 544 } 545 if (setsockopt(msgsock, SOL_SOCKET, 546 SO_KEEPALIVE, (char *)&on, sizeof(on)) < 0) 547 syslog(LOG_ERR, "setsockopt SO_KEEPALIVE: %m"); 548 nfsdargs.sock = msgsock; 549 nfsdargs.name = (caddr_t)&inetpeer; 550 nfsdargs.namelen = len; 551 nfssvc(NFSSVC_ADDSOCK, &nfsdargs); 552 (void)close(msgsock); 553 } 554 #endif /* notyet */ 555 } 556 } 557 558 void 559 usage() 560 { 561 (void)fprintf(stderr, "usage: nfsd %s\n", USAGE); 562 exit(1); 563 } 564 565 void 566 nonfs(signo) 567 int signo; 568 { 569 syslog(LOG_ERR, "missing system call: NFS not available."); 570 } 571