1 /* $OpenBSD: nfsd.c,v 1.21 2003/06/02 20:06:16 millert Exp $ */ 2 /* $NetBSD: nfsd.c,v 1.19 1996/02/18 23:18:56 mycroft Exp $ */ 3 4 /* 5 * Copyright (c) 1989, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Rick Macklem at The University of Guelph. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 static char copyright[] = 38 "@(#) Copyright (c) 1989, 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)nfsd.c 8.9 (Berkeley) 3/29/95"; 45 #else 46 static char rcsid[] = "$NetBSD: nfsd.c,v 1.19 1996/02/18 23:18:56 mycroft Exp $"; 47 #endif 48 #endif /* not lint */ 49 50 #include <sys/param.h> 51 #include <sys/ioctl.h> 52 #include <sys/stat.h> 53 #include <sys/wait.h> 54 #include <sys/uio.h> 55 #include <sys/ucred.h> 56 #include <sys/mount.h> 57 #include <sys/socket.h> 58 #include <sys/socketvar.h> 59 60 #include <rpc/rpc.h> 61 #include <rpc/pmap_clnt.h> 62 #include <rpc/pmap_prot.h> 63 64 #ifdef ISO 65 #include <netiso/iso.h> 66 #endif 67 #include <nfs/rpcv2.h> 68 #include <nfs/nfsproto.h> 69 #include <nfs/nfs.h> 70 71 #include <err.h> 72 #include <errno.h> 73 #include <fcntl.h> 74 #include <grp.h> 75 #include <pwd.h> 76 #include <signal.h> 77 #include <stdio.h> 78 #include <stdlib.h> 79 #include <string.h> 80 #include <syslog.h> 81 #include <unistd.h> 82 83 /* Global defs */ 84 #ifdef DEBUG 85 #define syslog(e, s) fprintf(stderr,(s)) 86 int debug = 1; 87 #else 88 int debug = 0; 89 #endif 90 91 struct nfsd_srvargs nsd; 92 93 void nonfs(int); 94 void reapchild(int); 95 void usage(void); 96 97 /* 98 * Nfs server daemon mostly just a user context for nfssvc() 99 * 100 * 1 - do file descriptor and signal cleanup 101 * 2 - fork the nfsd(s) 102 * 3 - create server socket(s) 103 * 4 - register socket with portmap 104 * 105 * For connectionless protocols, just pass the socket into the kernel via. 106 * nfssvc(). 107 * For connection based sockets, loop doing accepts. When you get a new 108 * socket from accept, pass the msgsock into the kernel via. nfssvc(). 109 * The arguments are: 110 * -c - support iso cltp clients 111 * -r - reregister with portmapper 112 * -t - support tcp nfs clients 113 * -u - support udp nfs clients 114 * followed by "n" which is the number of nfsds' to fork off 115 */ 116 int 117 main(int argc, char *argv[]) 118 { 119 struct nfsd_args nfsdargs; 120 struct sockaddr_in inetaddr, inetpeer; 121 #ifdef ISO 122 struct sockaddr_iso isoaddr, isopeer; 123 #endif 124 fd_set ready, sockbits; 125 int ch, cltpflag, connect_type_cnt, i, maxsock = 0, msgsock; 126 int nfsdcnt, nfssvc_flag, on, reregister, sock, tcpflag, tcpsock; 127 int tp4cnt, tpipcnt, udpflag; 128 socklen_t len; 129 130 #define MAXNFSDCNT 20 131 #define DEFNFSDCNT 4 132 nfsdcnt = DEFNFSDCNT; 133 cltpflag = reregister = tcpflag = tp4cnt = tpipcnt = 0; 134 tcpsock = udpflag = 0; 135 #ifdef ISO 136 #define GETOPT "cn:rtu" 137 #define USAGE "[-crtu] [-n num_servers]" 138 #else 139 #define GETOPT "n:rtu" 140 #define USAGE "[-rtu] [-n num_servers]" 141 #endif 142 while ((ch = getopt(argc, argv, GETOPT)) != -1) 143 switch (ch) { 144 case 'n': 145 nfsdcnt = atoi(optarg); 146 if (nfsdcnt < 1 || nfsdcnt > MAXNFSDCNT) { 147 warnx("nfsd count %d; reset to %d", 148 nfsdcnt, DEFNFSDCNT); 149 nfsdcnt = DEFNFSDCNT; 150 } 151 break; 152 case 'r': 153 reregister = 1; 154 break; 155 case 't': 156 tcpflag = 1; 157 break; 158 case 'u': 159 udpflag = 1; 160 break; 161 #ifdef ISO 162 case 'c': 163 cltpflag = 1; 164 break; 165 #ifdef notyet 166 case 'i': 167 tp4cnt = 1; 168 break; 169 case 'p': 170 tpipcnt = 1; 171 break; 172 #endif /* notyet */ 173 #endif /* ISO */ 174 default: 175 case '?': 176 usage(); 177 }; 178 argv += optind; 179 argc -= optind; 180 181 /* 182 * XXX 183 * Backward compatibility, trailing number is the count of daemons. 184 */ 185 if (argc > 1) 186 usage(); 187 if (argc == 1) { 188 nfsdcnt = atoi(argv[0]); 189 if (nfsdcnt < 1 || nfsdcnt > MAXNFSDCNT) { 190 warnx("nfsd count %d; reset to %d", 191 nfsdcnt, DEFNFSDCNT); 192 nfsdcnt = DEFNFSDCNT; 193 } 194 } 195 196 if (debug == 0) { 197 daemon(0, 0); 198 (void)signal(SIGHUP, SIG_IGN); 199 (void)signal(SIGINT, SIG_IGN); 200 (void)signal(SIGQUIT, SIG_IGN); 201 (void)signal(SIGSYS, nonfs); 202 } 203 (void)signal(SIGCHLD, reapchild); 204 205 if (reregister) { 206 if (udpflag && 207 (!pmap_set(RPCPROG_NFS, 2, IPPROTO_UDP, NFS_PORT) || 208 !pmap_set(RPCPROG_NFS, 3, IPPROTO_UDP, NFS_PORT))) 209 err(1, "can't register with portmap for UDP."); 210 if (tcpflag && 211 (!pmap_set(RPCPROG_NFS, 2, IPPROTO_TCP, NFS_PORT) || 212 !pmap_set(RPCPROG_NFS, 3, IPPROTO_TCP, NFS_PORT))) 213 err(1, "can't register with portmap for TCP."); 214 return (0); 215 } 216 openlog("nfsd:", LOG_PID, LOG_DAEMON); 217 218 for (i = 0; i < nfsdcnt; i++) { 219 switch (fork()) { 220 case -1: 221 syslog(LOG_ERR, "fork: %m"); 222 return (1); 223 case 0: 224 break; 225 default: 226 continue; 227 } 228 229 setproctitle("server"); 230 nfssvc_flag = NFSSVC_NFSD; 231 nsd.nsd_nfsd = NULL; 232 while (nfssvc(nfssvc_flag, &nsd) < 0) { 233 if (errno != ENEEDAUTH) { 234 syslog(LOG_ERR, "nfssvc: %m"); 235 return (1); 236 } 237 nfssvc_flag = NFSSVC_NFSD | NFSSVC_AUTHINFAIL; 238 } 239 return (0); 240 } 241 242 /* If we are serving udp, set up the socket. */ 243 if (udpflag) { 244 if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 245 syslog(LOG_ERR, "can't create udp socket"); 246 return (1); 247 } 248 memset(&inetaddr, 0, sizeof inetaddr); 249 inetaddr.sin_family = AF_INET; 250 inetaddr.sin_addr.s_addr = INADDR_ANY; 251 inetaddr.sin_port = htons(NFS_PORT); 252 inetaddr.sin_len = sizeof(inetaddr); 253 if (bind(sock, 254 (struct sockaddr *)&inetaddr, sizeof(inetaddr)) < 0) { 255 syslog(LOG_ERR, "can't bind udp addr"); 256 return (1); 257 } 258 if (!pmap_set(RPCPROG_NFS, 2, IPPROTO_UDP, NFS_PORT) || 259 !pmap_set(RPCPROG_NFS, 3, IPPROTO_UDP, NFS_PORT)) { 260 syslog(LOG_ERR, "can't register with udp portmap"); 261 return (1); 262 } 263 nfsdargs.sock = sock; 264 nfsdargs.name = NULL; 265 nfsdargs.namelen = 0; 266 if (nfssvc(NFSSVC_ADDSOCK, &nfsdargs) < 0) { 267 syslog(LOG_ERR, "can't Add UDP socket"); 268 return (1); 269 } 270 (void)close(sock); 271 } 272 273 #ifdef ISO 274 /* If we are serving cltp, set up the socket. */ 275 if (cltpflag) { 276 if ((sock = socket(AF_ISO, SOCK_DGRAM, 0)) < 0) { 277 syslog(LOG_ERR, "can't create cltp socket"); 278 return (1); 279 } 280 memset(&isoaddr, 0, sizeof(isoaddr)); 281 isoaddr.siso_family = AF_ISO; 282 isoaddr.siso_tlen = 2; 283 cp = TSEL(&isoaddr); 284 *cp++ = (NFS_PORT >> 8); 285 *cp = (NFS_PORT & 0xff); 286 isoaddr.siso_len = sizeof(isoaddr); 287 if (bind(sock, 288 (struct sockaddr *)&isoaddr, sizeof(isoaddr)) < 0) { 289 syslog(LOG_ERR, "can't bind cltp addr"); 290 return (1); 291 } 292 #ifdef notyet 293 /* 294 * XXX 295 * Someday this should probably use "rpcbind", the son of 296 * portmap. 297 */ 298 if (!pmap_set(RPCPROG_NFS, NFS_VER2, IPPROTO_UDP, NFS_PORT)) { 299 syslog(LOG_ERR, "can't register with udp portmap"); 300 return (1); 301 } 302 #endif /* notyet */ 303 nfsdargs.sock = sock; 304 nfsdargs.name = NULL; 305 nfsdargs.namelen = 0; 306 if (nfssvc(NFSSVC_ADDSOCK, &nfsdargs) < 0) { 307 syslog(LOG_ERR, "can't add UDP socket"); 308 return (1); 309 } 310 close(sock); 311 } 312 #endif /* ISO */ 313 314 /* Now set up the master server socket waiting for tcp connections. */ 315 on = 1; 316 FD_ZERO(&sockbits); 317 connect_type_cnt = 0; 318 if (tcpflag) { 319 if ((tcpsock = socket(AF_INET, SOCK_STREAM, 0)) < 0) { 320 syslog(LOG_ERR, "can't create tcp socket"); 321 return (1); 322 } 323 if (setsockopt(tcpsock, 324 SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) < 0) 325 syslog(LOG_ERR, "setsockopt SO_REUSEADDR: %m"); 326 memset(&inetaddr, 0, sizeof inetaddr); 327 inetaddr.sin_family = AF_INET; 328 inetaddr.sin_addr.s_addr = INADDR_ANY; 329 inetaddr.sin_port = htons(NFS_PORT); 330 inetaddr.sin_len = sizeof(inetaddr); 331 if (bind(tcpsock, 332 (struct sockaddr *)&inetaddr, sizeof (inetaddr)) < 0) { 333 syslog(LOG_ERR, "can't bind tcp addr"); 334 return (1); 335 } 336 if (listen(tcpsock, 5) < 0) { 337 syslog(LOG_ERR, "listen failed"); 338 return (1); 339 } 340 if (!pmap_set(RPCPROG_NFS, 2, IPPROTO_TCP, NFS_PORT) || 341 !pmap_set(RPCPROG_NFS, 3, IPPROTO_TCP, NFS_PORT)) { 342 syslog(LOG_ERR, "can't register tcp with portmap"); 343 return (1); 344 } 345 FD_SET(tcpsock, &sockbits); 346 maxsock = tcpsock; 347 connect_type_cnt++; 348 } 349 350 #ifdef notyet 351 /* Now set up the master server socket waiting for tp4 connections. */ 352 if (tp4flag) { 353 if ((tp4sock = socket(AF_ISO, SOCK_SEQPACKET, 0)) < 0) { 354 syslog(LOG_ERR, "can't create tp4 socket"); 355 return (1); 356 } 357 if (setsockopt(tp4sock, 358 SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) < 0) 359 syslog(LOG_ERR, "setsockopt SO_REUSEADDR: %m"); 360 memset(&isoaddr, 0, sizeof(isoaddr)); 361 isoaddr.siso_family = AF_ISO; 362 isoaddr.siso_tlen = 2; 363 cp = TSEL(&isoaddr); 364 *cp++ = (NFS_PORT >> 8); 365 *cp = (NFS_PORT & 0xff); 366 isoaddr.siso_len = sizeof(isoaddr); 367 if (bind(tp4sock, 368 (struct sockaddr *)&isoaddr, sizeof(isoaddr)) < 0) { 369 syslog(LOG_ERR, "can't bind tp4 addr"); 370 return (1); 371 } 372 if (listen(tp4sock, 5) < 0) { 373 syslog(LOG_ERR, "listen failed"); 374 return (1); 375 } 376 /* 377 * XXX 378 * Someday this should probably use "rpcbind", the son of 379 * portmap. 380 */ 381 if (!pmap_set(RPCPROG_NFS, NFS_VER2, IPPROTO_TCP, NFS_PORT)) { 382 syslog(LOG_ERR, "can't register tcp with portmap"); 383 return (1); 384 } 385 FD_SET(tp4sock, &sockbits); 386 maxsock = tp4sock; 387 connect_type_cnt++; 388 } 389 390 /* Now set up the master server socket waiting for tpip connections. */ 391 if (tpipflag) { 392 if ((tpipsock = socket(AF_INET, SOCK_SEQPACKET, 0)) < 0) { 393 syslog(LOG_ERR, "can't create tpip socket"); 394 return (1); 395 } 396 if (setsockopt(tpipsock, 397 SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) < 0) 398 syslog(LOG_ERR, "setsockopt SO_REUSEADDR: %m"); 399 memset(&inetaddr, 0, sizeof inetaddr); 400 inetaddr.sin_family = AF_INET; 401 inetaddr.sin_addr.s_addr = INADDR_ANY; 402 inetaddr.sin_port = htons(NFS_PORT); 403 inetaddr.sin_len = sizeof(inetaddr); 404 if (bind(tpipsock, 405 (struct sockaddr *)&inetaddr, sizeof (inetaddr)) < 0) { 406 syslog(LOG_ERR, "can't bind tcp addr"); 407 return (1); 408 } 409 if (listen(tpipsock, 5) < 0) { 410 syslog(LOG_ERR, "listen failed"); 411 return (1); 412 } 413 /* 414 * XXX 415 * Someday this should probably use "rpcbind", the son of 416 * portmap. 417 */ 418 if (!pmap_set(RPCPROG_NFS, NFS_VER2, IPPROTO_TCP, NFS_PORT)) { 419 syslog(LOG_ERR, "can't register tcp with portmap"); 420 return (1); 421 } 422 FD_SET(tpipsock, &sockbits); 423 maxsock = tpipsock; 424 connect_type_cnt++; 425 } 426 #endif /* notyet */ 427 428 if (connect_type_cnt == 0) 429 return (0); 430 431 setproctitle("master"); 432 433 /* 434 * Loop forever accepting connections and passing the sockets 435 * into the kernel for the mounts. 436 */ 437 for (;;) { 438 ready = sockbits; 439 if (connect_type_cnt > 1) { 440 if (select(maxsock + 1, 441 &ready, NULL, NULL, NULL) < 1) { 442 syslog(LOG_ERR, "select failed: %m"); 443 return (1); 444 } 445 } 446 if (tcpflag && FD_ISSET(tcpsock, &ready)) { 447 len = sizeof(inetpeer); 448 if ((msgsock = accept(tcpsock, 449 (struct sockaddr *)&inetpeer, &len)) < 0) { 450 syslog(LOG_ERR, "accept failed: %m"); 451 return (1); 452 } 453 memset(inetpeer.sin_zero, 0, sizeof(inetpeer.sin_zero)); 454 if (setsockopt(msgsock, SOL_SOCKET, 455 SO_KEEPALIVE, (char *)&on, sizeof(on)) < 0) 456 syslog(LOG_ERR, 457 "setsockopt SO_KEEPALIVE: %m"); 458 nfsdargs.sock = msgsock; 459 nfsdargs.name = (caddr_t)&inetpeer; 460 nfsdargs.namelen = sizeof(inetpeer); 461 nfssvc(NFSSVC_ADDSOCK, &nfsdargs); 462 (void)close(msgsock); 463 } 464 #ifdef notyet 465 if (tp4flag && FD_ISSET(tp4sock, &ready)) { 466 len = sizeof(isopeer); 467 if ((msgsock = accept(tp4sock, 468 (struct sockaddr *)&isopeer, &len)) < 0) { 469 syslog(LOG_ERR, "accept failed: %m"); 470 return (1); 471 } 472 if (setsockopt(msgsock, SOL_SOCKET, 473 SO_KEEPALIVE, (char *)&on, sizeof(on)) < 0) 474 syslog(LOG_ERR, 475 "setsockopt SO_KEEPALIVE: %m"); 476 nfsdargs.sock = msgsock; 477 nfsdargs.name = (caddr_t)&isopeer; 478 nfsdargs.namelen = len; 479 nfssvc(NFSSVC_ADDSOCK, &nfsdargs); 480 (void)close(msgsock); 481 } 482 if (tpipflag && FD_ISSET(tpipsock, &ready)) { 483 len = sizeof(inetpeer); 484 if ((msgsock = accept(tpipsock, 485 (struct sockaddr *)&inetpeer, &len)) < 0) { 486 syslog(LOG_ERR, "Accept failed: %m"); 487 return (1); 488 } 489 if (setsockopt(msgsock, SOL_SOCKET, 490 SO_KEEPALIVE, (char *)&on, sizeof(on)) < 0) 491 syslog(LOG_ERR, "setsockopt SO_KEEPALIVE: %m"); 492 nfsdargs.sock = msgsock; 493 nfsdargs.name = (caddr_t)&inetpeer; 494 nfsdargs.namelen = len; 495 nfssvc(NFSSVC_ADDSOCK, &nfsdargs); 496 (void)close(msgsock); 497 } 498 #endif /* notyet */ 499 } 500 } 501 502 void 503 usage(void) 504 { 505 (void)fprintf(stderr, "usage: nfsd %s\n", USAGE); 506 exit(1); 507 } 508 509 void 510 nonfs(int signo) 511 { 512 int save_errno = errno; 513 struct syslog_data sdata = SYSLOG_DATA_INIT; 514 515 syslog_r(LOG_ERR, &sdata, "missing system call: NFS not available."); 516 errno = save_errno; 517 } 518 519 void 520 reapchild(int signo) 521 { 522 int save_errno = errno; 523 524 while (wait3(NULL, WNOHANG, NULL) > 0) 525 ; 526 errno = save_errno; 527 } 528