nfsd.c revision 1.54
1 /* $NetBSD: nfsd.c,v 1.54 2008/07/21 13:36:59 lukem 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\ 38 The Regents of the University of California. All rights reserved."); 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 1.54 2008/07/21 13:36:59 lukem 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 DEFNFSDCNT 4 152 nfsdcnt = DEFNFSDCNT; 153 cltpflag = reregister = tcpflag = tp4cnt = tp4flag = tpipcnt = 0; 154 tpipflag = udpflag = ip6flag = 0; 155 nconf_udp = nconf_tcp = nconf_udp6 = nconf_tcp6 = NULL; 156 maxsock = 0; 157 tcpsock = tcp6sock = -1; 158 #define GETOPT "6n:rtu" 159 #define USAGE "[-rtu] [-n num_servers]" 160 while ((ch = getopt(argc, argv, GETOPT)) != -1) { 161 switch (ch) { 162 case '6': 163 ip6flag = 1; 164 s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP); 165 if (s < 0 && (errno == EPROTONOSUPPORT || 166 errno == EPFNOSUPPORT || errno == EAFNOSUPPORT)) 167 ip6flag = 0; 168 else 169 close(s); 170 break; 171 case 'n': 172 nfsdcnt = atoi(optarg); 173 if (nfsdcnt < 1) { 174 warnx("nfsd count %d; reset to %d", nfsdcnt, DEFNFSDCNT); 175 nfsdcnt = DEFNFSDCNT; 176 } 177 break; 178 case 'r': 179 reregister = 1; 180 break; 181 case 't': 182 tcpflag = 1; 183 break; 184 case 'u': 185 udpflag = 1; 186 break; 187 default: 188 case '?': 189 usage(); 190 }; 191 } 192 argv += optind; 193 argc -= optind; 194 195 /* 196 * XXX 197 * Backward compatibility, trailing number is the count of daemons. 198 */ 199 if (argc > 1) 200 usage(); 201 if (argc == 1) { 202 nfsdcnt = atoi(argv[0]); 203 if (nfsdcnt < 1) { 204 warnx("nfsd count %d; reset to %d", nfsdcnt, DEFNFSDCNT); 205 nfsdcnt = DEFNFSDCNT; 206 } 207 } 208 209 /* 210 * If none of TCP or UDP are specified, default to UDP only. 211 */ 212 if (tcpflag == 0 && udpflag == 0) 213 udpflag = 1; 214 215 if (debug == 0) { 216 daemon(0, 0); 217 (void)signal(SIGHUP, SIG_IGN); 218 (void)signal(SIGINT, SIG_IGN); 219 (void)signal(SIGQUIT, SIG_IGN); 220 (void)signal(SIGSYS, nonfs); 221 } 222 223 if (udpflag) { 224 memset(&hints, 0, sizeof hints); 225 hints.ai_flags = AI_PASSIVE; 226 hints.ai_family = PF_INET; 227 hints.ai_socktype = SOCK_DGRAM; 228 hints.ai_protocol = IPPROTO_UDP; 229 230 ecode = getaddrinfo(NULL, "nfs", &hints, &ai_udp); 231 if (ecode != 0) { 232 syslog(LOG_ERR, "getaddrinfo udp: %s", 233 gai_strerror(ecode)); 234 exit(1); 235 } 236 237 nconf_udp = getnetconfigent("udp"); 238 239 if (nconf_udp == NULL) 240 err(1, "getnetconfigent udp failed"); 241 242 nb_udp.buf = ai_udp->ai_addr; 243 nb_udp.len = nb_udp.maxlen = ai_udp->ai_addrlen; 244 if (reregister) 245 if (!rpcb_set(RPCPROG_NFS, 2, nconf_udp, &nb_udp)) 246 err(1, "rpcb_set udp failed"); 247 } 248 249 if (tcpflag) { 250 memset(&hints, 0, sizeof hints); 251 hints.ai_flags = AI_PASSIVE; 252 hints.ai_family = PF_INET; 253 hints.ai_socktype = SOCK_STREAM; 254 hints.ai_protocol = IPPROTO_TCP; 255 256 ecode = getaddrinfo(NULL, "nfs", &hints, &ai_tcp); 257 if (ecode != 0) { 258 syslog(LOG_ERR, "getaddrinfo tcp: %s", 259 gai_strerror(ecode)); 260 exit(1); 261 } 262 263 nconf_tcp = getnetconfigent("tcp"); 264 265 if (nconf_tcp == NULL) 266 err(1, "getnetconfigent tcp failed"); 267 268 nb_tcp.buf = ai_tcp->ai_addr; 269 nb_tcp.len = nb_tcp.maxlen = ai_tcp->ai_addrlen; 270 if (reregister) 271 if (!rpcb_set(RPCPROG_NFS, 2, nconf_tcp, &nb_tcp)) 272 err(1, "rpcb_set tcp failed"); 273 } 274 275 if (udpflag && ip6flag) { 276 memset(&hints, 0, sizeof hints); 277 hints.ai_flags = AI_PASSIVE; 278 hints.ai_family = PF_INET6; 279 hints.ai_socktype = SOCK_DGRAM; 280 hints.ai_protocol = IPPROTO_UDP; 281 282 ecode = getaddrinfo(NULL, "nfs", &hints, &ai_udp6); 283 if (ecode != 0) { 284 syslog(LOG_ERR, "getaddrinfo udp: %s", 285 gai_strerror(ecode)); 286 exit(1); 287 } 288 289 nconf_udp6 = getnetconfigent("udp6"); 290 291 if (nconf_udp6 == NULL) 292 err(1, "getnetconfigent udp6 failed"); 293 294 nb_udp6.buf = ai_udp6->ai_addr; 295 nb_udp6.len = nb_udp6.maxlen = ai_udp6->ai_addrlen; 296 if (reregister) 297 if (!rpcb_set(RPCPROG_NFS, 2, nconf_udp6, &nb_udp6)) 298 err(1, "rpcb_set udp6 failed"); 299 } 300 301 if (tcpflag && ip6flag) { 302 memset(&hints, 0, sizeof hints); 303 hints.ai_flags = AI_PASSIVE; 304 hints.ai_family = PF_INET6; 305 hints.ai_socktype = SOCK_STREAM; 306 hints.ai_protocol = IPPROTO_TCP; 307 308 ecode = getaddrinfo(NULL, "nfs", &hints, &ai_tcp6); 309 if (ecode != 0) { 310 syslog(LOG_ERR, "getaddrinfo tcp: %s", 311 gai_strerror(ecode)); 312 exit(1); 313 } 314 315 nconf_tcp6 = getnetconfigent("tcp6"); 316 317 if (nconf_tcp6 == NULL) 318 err(1, "getnetconfigent tcp6 failed"); 319 320 nb_tcp6.buf = ai_tcp6->ai_addr; 321 nb_tcp6.len = nb_tcp6.maxlen = ai_tcp6->ai_addrlen; 322 if (reregister) 323 if (!rpcb_set(RPCPROG_NFS, 2, nconf_tcp6, &nb_tcp6)) 324 err(1, "rpcb_set tcp6 failed"); 325 } 326 327 openlog("nfsd", LOG_PID, LOG_DAEMON); 328 329 for (i = 0; i < nfsdcnt; i++) { 330 pthread_t t; 331 int error; 332 333 error = pthread_create(&t, NULL, child, NULL); 334 if (error) { 335 errno = error; 336 syslog(LOG_ERR, "pthread_create: %m"); 337 exit (1); 338 } 339 } 340 341 /* If we are serving udp, set up the socket. */ 342 if (udpflag) { 343 if ((sock = socket(ai_udp->ai_family, ai_udp->ai_socktype, 344 ai_udp->ai_protocol)) < 0) { 345 syslog(LOG_ERR, "can't create udp socket"); 346 exit(1); 347 } 348 if (bind(sock, ai_udp->ai_addr, ai_udp->ai_addrlen) < 0) { 349 syslog(LOG_ERR, "can't bind udp addr"); 350 exit(1); 351 } 352 if (!rpcb_set(RPCPROG_NFS, 2, nconf_udp, &nb_udp) || 353 !rpcb_set(RPCPROG_NFS, 3, nconf_udp, &nb_udp)) { 354 syslog(LOG_ERR, "can't register with udp portmap"); 355 exit(1); 356 } 357 nfsdargs.sock = sock; 358 nfsdargs.name = NULL; 359 nfsdargs.namelen = 0; 360 if (nfssvc(NFSSVC_ADDSOCK, &nfsdargs) < 0) { 361 syslog(LOG_ERR, "can't add UDP socket"); 362 exit(1); 363 } 364 (void)close(sock); 365 } 366 367 if (udpflag &&ip6flag) { 368 if ((sock = socket(ai_udp6->ai_family, ai_udp6->ai_socktype, 369 ai_udp6->ai_protocol)) < 0) { 370 syslog(LOG_ERR, "can't create udp socket"); 371 exit(1); 372 } 373 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, 374 &on, sizeof on) < 0) { 375 syslog(LOG_ERR, "can't set v6-only binding for udp6 " 376 "socket: %m"); 377 exit(1); 378 } 379 if (bind(sock, ai_udp6->ai_addr, ai_udp6->ai_addrlen) < 0) { 380 syslog(LOG_ERR, "can't bind udp addr"); 381 exit(1); 382 } 383 if (!rpcb_set(RPCPROG_NFS, 2, nconf_udp6, &nb_udp6) || 384 !rpcb_set(RPCPROG_NFS, 3, nconf_udp6, &nb_udp6)) { 385 syslog(LOG_ERR, "can't register with udp portmap"); 386 exit(1); 387 } 388 nfsdargs.sock = sock; 389 nfsdargs.name = NULL; 390 nfsdargs.namelen = 0; 391 if (nfssvc(NFSSVC_ADDSOCK, &nfsdargs) < 0) { 392 syslog(LOG_ERR, "can't add UDP6 socket"); 393 exit(1); 394 } 395 (void)close(sock); 396 } 397 398 /* Now set up the master server socket waiting for tcp connections. */ 399 on = 1; 400 connect_type_cnt = 0; 401 if (tcpflag) { 402 if ((tcpsock = socket(ai_tcp->ai_family, ai_tcp->ai_socktype, 403 ai_tcp->ai_protocol)) < 0) { 404 syslog(LOG_ERR, "can't create tcp socket"); 405 exit(1); 406 } 407 if (setsockopt(tcpsock, 408 SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) < 0) 409 syslog(LOG_ERR, "setsockopt SO_REUSEADDR: %m"); 410 if (bind(tcpsock, ai_tcp->ai_addr, ai_tcp->ai_addrlen) < 0) { 411 syslog(LOG_ERR, "can't bind tcp addr"); 412 exit(1); 413 } 414 if (listen(tcpsock, 5) < 0) { 415 syslog(LOG_ERR, "listen failed"); 416 exit(1); 417 } 418 if (!rpcb_set(RPCPROG_NFS, 2, nconf_tcp, &nb_tcp) || 419 !rpcb_set(RPCPROG_NFS, 3, nconf_tcp, &nb_tcp)) { 420 syslog(LOG_ERR, "can't register tcp with rpcbind"); 421 exit(1); 422 } 423 set[0].fd = tcpsock; 424 set[0].events = POLLIN; 425 connect_type_cnt++; 426 } else 427 set[0].fd = -1; 428 429 if (tcpflag && ip6flag) { 430 if ((tcp6sock = socket(ai_tcp6->ai_family, ai_tcp6->ai_socktype, 431 ai_tcp6->ai_protocol)) < 0) { 432 syslog(LOG_ERR, "can't create tcp socket"); 433 exit(1); 434 } 435 if (setsockopt(tcp6sock, 436 SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) < 0) 437 syslog(LOG_ERR, "setsockopt SO_REUSEADDR: %m"); 438 if (setsockopt(tcp6sock, IPPROTO_IPV6, IPV6_V6ONLY, 439 &on, sizeof on) < 0) { 440 syslog(LOG_ERR, "can't set v6-only binding for tcp6 " 441 "socket: %m"); 442 exit(1); 443 } 444 if (bind(tcp6sock, ai_tcp6->ai_addr, ai_tcp6->ai_addrlen) < 0) { 445 syslog(LOG_ERR, "can't bind tcp6 addr"); 446 exit(1); 447 } 448 if (listen(tcp6sock, 5) < 0) { 449 syslog(LOG_ERR, "listen failed"); 450 exit(1); 451 } 452 if (!rpcb_set(RPCPROG_NFS, 2, nconf_tcp6, &nb_tcp6) || 453 !rpcb_set(RPCPROG_NFS, 3, nconf_tcp6, &nb_tcp6)) { 454 syslog(LOG_ERR, "can't register tcp6 with rpcbind"); 455 exit(1); 456 } 457 set[1].fd = tcp6sock; 458 set[1].events = POLLIN; 459 connect_type_cnt++; 460 } else 461 set[1].fd = -1; 462 463 set[2].fd = -1; 464 set[3].fd = -1; 465 466 if (connect_type_cnt == 0) 467 exit(0); 468 469 pthread_setname_np(pthread_self(), "master", NULL); 470 471 /* 472 * Loop forever accepting connections and passing the sockets 473 * into the kernel for the mounts. 474 */ 475 for (;;) { 476 if (poll(set, 4, INFTIM) < 1) { 477 syslog(LOG_ERR, "poll failed: %m"); 478 exit(1); 479 } 480 481 if (set[0].revents & POLLIN) { 482 len = sizeof(inetpeer); 483 if ((msgsock = accept(tcpsock, 484 (struct sockaddr *)&inetpeer, &len)) < 0) { 485 syslog(LOG_ERR, "accept failed: %m"); 486 exit(1); 487 } 488 memset(inetpeer.sin_zero, 0, sizeof(inetpeer.sin_zero)); 489 if (setsockopt(msgsock, SOL_SOCKET, 490 SO_KEEPALIVE, (char *)&on, sizeof(on)) < 0) 491 syslog(LOG_ERR, 492 "setsockopt SO_KEEPALIVE: %m"); 493 nfsdargs.sock = msgsock; 494 nfsdargs.name = (caddr_t)&inetpeer; 495 nfsdargs.namelen = sizeof(inetpeer); 496 nfssvc(NFSSVC_ADDSOCK, &nfsdargs); 497 (void)close(msgsock); 498 } 499 500 if (set[1].revents & POLLIN) { 501 len = sizeof(inet6peer); 502 if ((msgsock = accept(tcp6sock, 503 (struct sockaddr *)&inet6peer, &len)) < 0) { 504 syslog(LOG_ERR, "accept failed: %m"); 505 exit(1); 506 } 507 if (setsockopt(msgsock, SOL_SOCKET, 508 SO_KEEPALIVE, (char *)&on, sizeof(on)) < 0) 509 syslog(LOG_ERR, 510 "setsockopt SO_KEEPALIVE: %m"); 511 nfsdargs.sock = msgsock; 512 nfsdargs.name = (caddr_t)&inet6peer; 513 nfsdargs.namelen = sizeof(inet6peer); 514 nfssvc(NFSSVC_ADDSOCK, &nfsdargs); 515 (void)close(msgsock); 516 } 517 518 #ifdef notyet 519 if (set[2].revents & POLLIN) { 520 len = sizeof(isopeer); 521 if ((msgsock = accept(tp4sock, 522 (struct sockaddr *)&isopeer, &len)) < 0) { 523 syslog(LOG_ERR, "accept failed: %m"); 524 exit(1); 525 } 526 if (setsockopt(msgsock, SOL_SOCKET, 527 SO_KEEPALIVE, (char *)&on, sizeof(on)) < 0) 528 syslog(LOG_ERR, 529 "setsockopt SO_KEEPALIVE: %m"); 530 nfsdargs.sock = msgsock; 531 nfsdargs.name = (caddr_t)&isopeer; 532 nfsdargs.namelen = len; 533 nfssvc(NFSSVC_ADDSOCK, &nfsdargs); 534 (void)close(msgsock); 535 } 536 537 if (set[3].revents & POLLIN) { 538 len = sizeof(inetpeer); 539 if ((msgsock = accept(tpipsock, 540 (struct sockaddr *)&inetpeer, &len)) < 0) { 541 syslog(LOG_ERR, "accept failed: %m"); 542 exit(1); 543 } 544 if (setsockopt(msgsock, SOL_SOCKET, 545 SO_KEEPALIVE, (char *)&on, sizeof(on)) < 0) 546 syslog(LOG_ERR, "setsockopt SO_KEEPALIVE: %m"); 547 nfsdargs.sock = msgsock; 548 nfsdargs.name = (caddr_t)&inetpeer; 549 nfsdargs.namelen = len; 550 nfssvc(NFSSVC_ADDSOCK, &nfsdargs); 551 (void)close(msgsock); 552 } 553 #endif /* notyet */ 554 } 555 } 556 557 void 558 usage() 559 { 560 (void)fprintf(stderr, "usage: nfsd %s\n", USAGE); 561 exit(1); 562 } 563 564 void 565 nonfs(signo) 566 int signo; 567 { 568 syslog(LOG_ERR, "missing system call: NFS not available."); 569 } 570
Indexes created Tue Sep 23 07:09:52 GMT 2025