1/* $NetBSD: nfsd.c,v 1.2 2010/07/27 14:04:47 macallan 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 43static char sccsid[] = "@(#)nfsd.c 8.9 (Berkeley) 3/29/95"; 44#else 45__RCSID("$NetBSD: nfsd.c,v 1.2 2010/07/27 14:04:47 macallan 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#include <rump/rump.h> 83#include <rump/rump_syscalls.h> 84 85/* Global defs */ 86#ifdef DEBUG 87#define syslog(e, s, args...) \ 88do { \ 89 fprintf(stderr,(s), ## args); \ 90 fprintf(stderr, "\n"); \ 91} while (/*CONSTCOND*/0) 92int debug = 1; 93#else 94int debug = 0; 95#endif 96 97int main __P((int, char **)); 98void nonfs __P((int)); 99void usage __P((void)); 100 101static void * 102child(void *arg) 103{ 104 struct nfsd_srvargs nsd; 105 int nfssvc_flag; 106 107 nfssvc_flag = NFSSVC_NFSD; 108 memset(&nsd, 0, sizeof(nsd)); 109 while (rump_sys_nfssvc(nfssvc_flag, &nsd) < 0) { 110 if (errno != ENEEDAUTH) { 111 syslog(LOG_ERR, "nfssvc: %m %d", errno); 112 exit(1); 113 } 114 nfssvc_flag = NFSSVC_NFSD | NFSSVC_AUTHINFAIL; 115 } 116 117 return NULL; 118} 119 120/* 121 * Nfs server daemon mostly just a user context for nfssvc() 122 * 123 * 1 - do file descriptor and signal cleanup 124 * 2 - create the nfsd thread(s) 125 * 3 - create server socket(s) 126 * 4 - register socket with portmap 127 * 128 * For connectionless protocols, just pass the socket into the kernel via 129 * nfssvc(). 130 * For connection based sockets, loop doing accepts. When you get a new 131 * socket from accept, pass the msgsock into the kernel via nfssvc(). 132 * The arguments are: 133 * -c - support iso cltp clients 134 * -r - reregister with portmapper 135 * -t - support tcp nfs clients 136 * -u - support udp nfs clients 137 * followed by "n" which is the number of nfsd threads to create 138 */ 139int nfsd_main(int, char**); 140int 141nfsd_main(argc, argv) 142 int argc; 143 char *argv[]; 144{ 145 struct nfsd_args nfsdargs; 146 struct addrinfo *ai_udp, *ai_tcp, *ai_udp6, *ai_tcp6, hints; 147 struct netconfig *nconf_udp, *nconf_tcp, *nconf_udp6, *nconf_tcp6; 148 struct netbuf nb_udp, nb_tcp, nb_udp6, nb_tcp6; 149 struct sockaddr_in inetpeer; 150 struct pollfd set[4]; 151 socklen_t len; 152 int ch, cltpflag, connect_type_cnt, i, maxsock, msgsock; 153 int nfsdcnt, on = 1, reregister, sock, tcpflag, tcpsock; 154 int tcp6sock, ip6flag; 155 int tp4cnt, tp4flag, tpipcnt, tpipflag, udpflag, ecode, s; 156 int error = 0; 157 158#define DEFNFSDCNT 4 159 nfsdcnt = DEFNFSDCNT; 160 cltpflag = reregister = tcpflag = tp4cnt = tp4flag = tpipcnt = 0; 161 tpipflag = udpflag = ip6flag = 0; 162 nconf_udp = nconf_tcp = nconf_udp6 = nconf_tcp6 = NULL; 163 maxsock = 0; 164 tcpsock = tcp6sock = -1; 165#define GETOPT "6n:rtu" 166#define USAGE "[-rtu] [-n num_servers]" 167 while ((ch = getopt(argc, argv, GETOPT)) != -1) { 168 switch (ch) { 169 case '6': 170 ip6flag = 1; 171 s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP); 172 if (s < 0 && (errno == EPROTONOSUPPORT || 173 errno == EPFNOSUPPORT || errno == EAFNOSUPPORT)) 174 ip6flag = 0; 175 else 176 close(s); 177 break; 178 case 'n': 179 nfsdcnt = atoi(optarg); 180 if (nfsdcnt < 1) { 181 warnx("nfsd count %d; reset to %d", nfsdcnt, DEFNFSDCNT); 182 nfsdcnt = DEFNFSDCNT; 183 } 184 break; 185 case 'r': 186 reregister = 1; 187 break; 188 case 't': 189 tcpflag = 1; 190 break; 191 case 'u': 192 udpflag = 1; 193 break; 194 default: 195 case '?': 196 usage(); 197 }; 198 } 199 argv += optind; 200 argc -= optind; 201 202 /* 203 * XXX 204 * Backward compatibility, trailing number is the count of daemons. 205 */ 206 if (argc > 1) 207 usage(); 208 if (argc == 1) { 209 nfsdcnt = atoi(argv[0]); 210 if (nfsdcnt < 1) { 211 warnx("nfsd count %d; reset to %d", nfsdcnt, DEFNFSDCNT); 212 nfsdcnt = DEFNFSDCNT; 213 } 214 } 215 216 /* 217 * If none of TCP or UDP are specified, default to UDP only. 218 */ 219 if (tcpflag == 0 && udpflag == 0) 220 udpflag = 1; 221 222 if (debug == 0) { 223 fprintf(stderr, "non-debug not supported here\n"); 224 exit(1); 225 226#ifdef not_the_debug_man 227 daemon(0, 0); 228 (void)signal(SIGHUP, SIG_IGN); 229 (void)signal(SIGINT, SIG_IGN); 230 (void)signal(SIGQUIT, SIG_IGN); 231 (void)signal(SIGSYS, nonfs); 232#endif 233 } 234 235 if (udpflag) { 236 memset(&hints, 0, sizeof hints); 237 hints.ai_flags = AI_PASSIVE; 238 hints.ai_family = PF_INET; 239 hints.ai_socktype = SOCK_DGRAM; 240 hints.ai_protocol = IPPROTO_UDP; 241 242 ecode = getaddrinfo(NULL, "nfs", &hints, &ai_udp); 243 if (ecode != 0) { 244 syslog(LOG_ERR, "getaddrinfo udp: %s", 245 gai_strerror(ecode)); 246 exit(1); 247 } 248 249 nconf_udp = getnetconfigent("udp"); 250 251 if (nconf_udp == NULL) 252 err(1, "getnetconfigent udp failed"); 253 254 nb_udp.buf = ai_udp->ai_addr; 255 nb_udp.len = nb_udp.maxlen = ai_udp->ai_addrlen; 256 if (reregister) 257 if (!rpcb_set(RPCPROG_NFS, 2, nconf_udp, &nb_udp)) 258 err(1, "rpcb_set udp failed"); 259 } 260 261 if (tcpflag) { 262 memset(&hints, 0, sizeof hints); 263 hints.ai_flags = AI_PASSIVE; 264 hints.ai_family = PF_INET; 265 hints.ai_socktype = SOCK_STREAM; 266 hints.ai_protocol = IPPROTO_TCP; 267 268 ecode = getaddrinfo(NULL, "nfs", &hints, &ai_tcp); 269 if (ecode != 0) { 270 syslog(LOG_ERR, "getaddrinfo tcp: %s", 271 gai_strerror(ecode)); 272 exit(1); 273 } 274 275 nconf_tcp = getnetconfigent("tcp"); 276 277 if (nconf_tcp == NULL) 278 err(1, "getnetconfigent tcp failed"); 279 280 nb_tcp.buf = ai_tcp->ai_addr; 281 nb_tcp.len = nb_tcp.maxlen = ai_tcp->ai_addrlen; 282 if (reregister) 283 if (!rpcb_set(RPCPROG_NFS, 2, nconf_tcp, &nb_tcp)) 284 err(1, "rpcb_set tcp failed"); 285 } 286 287 if (udpflag && ip6flag) { 288 memset(&hints, 0, sizeof hints); 289 hints.ai_flags = AI_PASSIVE; 290 hints.ai_family = PF_INET6; 291 hints.ai_socktype = SOCK_DGRAM; 292 hints.ai_protocol = IPPROTO_UDP; 293 294 ecode = getaddrinfo(NULL, "nfs", &hints, &ai_udp6); 295 if (ecode != 0) { 296 syslog(LOG_ERR, "getaddrinfo udp: %s", 297 gai_strerror(ecode)); 298 exit(1); 299 } 300 301 nconf_udp6 = getnetconfigent("udp6"); 302 303 if (nconf_udp6 == NULL) 304 err(1, "getnetconfigent udp6 failed"); 305 306 nb_udp6.buf = ai_udp6->ai_addr; 307 nb_udp6.len = nb_udp6.maxlen = ai_udp6->ai_addrlen; 308 if (reregister) 309 if (!rpcb_set(RPCPROG_NFS, 2, nconf_udp6, &nb_udp6)) 310 err(1, "rpcb_set udp6 failed"); 311 } 312 313 if (tcpflag && ip6flag) { 314 memset(&hints, 0, sizeof hints); 315 hints.ai_flags = AI_PASSIVE; 316 hints.ai_family = PF_INET6; 317 hints.ai_socktype = SOCK_STREAM; 318 hints.ai_protocol = IPPROTO_TCP; 319 320 ecode = getaddrinfo(NULL, "nfs", &hints, &ai_tcp6); 321 if (ecode != 0) { 322 syslog(LOG_ERR, "getaddrinfo tcp: %s", 323 gai_strerror(ecode)); 324 exit(1); 325 } 326 327 nconf_tcp6 = getnetconfigent("tcp6"); 328 329 if (nconf_tcp6 == NULL) 330 err(1, "getnetconfigent tcp6 failed"); 331 332 nb_tcp6.buf = ai_tcp6->ai_addr; 333 nb_tcp6.len = nb_tcp6.maxlen = ai_tcp6->ai_addrlen; 334 if (reregister) 335 if (!rpcb_set(RPCPROG_NFS, 2, nconf_tcp6, &nb_tcp6)) 336 err(1, "rpcb_set tcp6 failed"); 337 } 338 339 openlog("nfsd", LOG_PID, LOG_DAEMON); 340 341 for (i = 0; i < nfsdcnt; i++) { 342 pthread_t t; 343 pthread_create(&t, NULL, child, NULL); 344 } 345 346 /* If we are serving udp, set up the socket. */ 347 if (udpflag) { 348 if ((sock = rump_sys_socket(ai_udp->ai_family, ai_udp->ai_socktype, 349 ai_udp->ai_protocol)) < 0) { 350 syslog(LOG_ERR, "can't create udp socket"); 351 exit(1); 352 } 353 if (bind(sock, ai_udp->ai_addr, ai_udp->ai_addrlen) < 0) { 354 syslog(LOG_ERR, "can't bind udp addr"); 355 exit(1); 356 } 357 if (!rpcb_set(RPCPROG_NFS, 2, nconf_udp, &nb_udp) || 358 !rpcb_set(RPCPROG_NFS, 3, nconf_udp, &nb_udp)) { 359 syslog(LOG_ERR, "can't register with udp portmap"); 360 exit(1); 361 } 362 nfsdargs.sock = sock; 363 nfsdargs.name = NULL; 364 nfsdargs.namelen = 0; 365 if (rump_sys_nfssvc(NFSSVC_ADDSOCK, &nfsdargs) < 0) { 366 syslog(LOG_ERR, "can't add UDP socket"); 367 exit(1); 368 } 369 (void)rump_sys_close(sock); 370 } 371 372 if (udpflag &&ip6flag) { 373 if ((sock = rump_sys_socket(ai_udp6->ai_family, ai_udp6->ai_socktype, 374 ai_udp6->ai_protocol)) < 0) { 375 syslog(LOG_ERR, "can't create udp socket"); 376 exit(1); 377 } 378 if (rump_sys_setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, 379 &on, sizeof on) < 0) { 380 syslog(LOG_ERR, "can't set v6-only binding for udp6 " 381 "socket: %m"); 382 exit(1); 383 } 384 if (rump_sys_bind(sock, ai_udp6->ai_addr, ai_udp6->ai_addrlen) < 0) { 385 syslog(LOG_ERR, "can't bind udp addr"); 386 exit(1); 387 } 388 if (!rpcb_set(RPCPROG_NFS, 2, nconf_udp6, &nb_udp6) || 389 !rpcb_set(RPCPROG_NFS, 3, nconf_udp6, &nb_udp6)) { 390 syslog(LOG_ERR, "can't register with udp portmap"); 391 exit(1); 392 } 393 nfsdargs.sock = sock; 394 nfsdargs.name = NULL; 395 nfsdargs.namelen = 0; 396 if (rump_sys_nfssvc(NFSSVC_ADDSOCK, &nfsdargs) < 0) { 397 syslog(LOG_ERR, "can't add UDP6 socket"); 398 exit(1); 399 } 400 (void)rump_sys_close(sock); 401 } 402 403 /* Now set up the master server socket waiting for tcp connections. */ 404 on = 1; 405 connect_type_cnt = 0; 406 if (tcpflag) { 407 if ((tcpsock = rump_sys_socket(ai_tcp->ai_family, ai_tcp->ai_socktype, 408 ai_tcp->ai_protocol)) < 0) { 409 syslog(LOG_ERR, "can't create tcp socket"); 410 exit(1); 411 } 412 if (setsockopt(tcpsock, 413 SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) < 0) 414 syslog(LOG_ERR, "setsockopt SO_REUSEADDR: %m"); 415 if (bind(tcpsock, ai_tcp->ai_addr, ai_tcp->ai_addrlen) < 0) { 416 syslog(LOG_ERR, "can't bind tcp addr"); 417 exit(1); 418 } 419 if (rump_sys_listen(tcpsock, 5) < 0) { 420 syslog(LOG_ERR, "listen failed"); 421 exit(1); 422 } 423 if (!rpcb_set(RPCPROG_NFS, 2, nconf_tcp, &nb_tcp) || 424 !rpcb_set(RPCPROG_NFS, 3, nconf_tcp, &nb_tcp)) { 425 syslog(LOG_ERR, "can't register tcp with rpcbind"); 426 exit(1); 427 } 428 set[0].fd = tcpsock; 429 set[0].events = POLLIN; 430 connect_type_cnt++; 431 } else 432 set[0].fd = -1; 433 434 if (tcpflag && ip6flag) { 435 if ((tcp6sock = socket(ai_tcp6->ai_family, ai_tcp6->ai_socktype, 436 ai_tcp6->ai_protocol)) < 0) { 437 syslog(LOG_ERR, "can't create tcp socket"); 438 exit(1); 439 } 440 if (setsockopt(tcp6sock, 441 SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) < 0) 442 syslog(LOG_ERR, "setsockopt SO_REUSEADDR: %m"); 443 if (setsockopt(tcp6sock, IPPROTO_IPV6, IPV6_V6ONLY, 444 &on, sizeof on) < 0) { 445 syslog(LOG_ERR, "can't set v6-only binding for tcp6 " 446 "socket: %m"); 447 exit(1); 448 } 449 if (bind(tcp6sock, ai_tcp6->ai_addr, ai_tcp6->ai_addrlen) < 0) { 450 syslog(LOG_ERR, "can't bind tcp6 addr"); 451 exit(1); 452 } 453 if (listen(tcp6sock, 5) < 0) { 454 syslog(LOG_ERR, "listen failed"); 455 exit(1); 456 } 457 if (!rpcb_set(RPCPROG_NFS, 2, nconf_tcp6, &nb_tcp6) || 458 !rpcb_set(RPCPROG_NFS, 3, nconf_tcp6, &nb_tcp6)) { 459 syslog(LOG_ERR, "can't register tcp6 with rpcbind"); 460 exit(1); 461 } 462 set[1].fd = tcp6sock; 463 set[1].events = POLLIN; 464 connect_type_cnt++; 465 } else 466 set[1].fd = -1; 467 468 set[2].fd = -1; 469 set[3].fd = -1; 470 471 if (connect_type_cnt == 0) { 472 pause(); 473 exit(0); 474 } 475 476 /* 477 * Loop forever accepting connections and passing the sockets 478 * into the kernel for the mounts. 479 */ 480 for (;;) { 481 if (rump_sys_poll(set, 4, INFTIM) < 1) { 482 syslog(LOG_ERR, "poll failed: %m"); 483 exit(1); 484 } 485 486 len = sizeof(inetpeer); 487 if ((msgsock = accept(tcpsock, 488 (struct sockaddr *)&inetpeer, &len)) < 0) { 489 syslog(LOG_ERR, "accept failed: %d", error); 490 exit(1); 491 } 492 memset(inetpeer.sin_zero, 0, sizeof(inetpeer.sin_zero)); 493 if (setsockopt(msgsock, SOL_SOCKET, 494 SO_KEEPALIVE, (char *)&on, sizeof(on)) < 0) 495 syslog(LOG_ERR, 496 "setsockopt SO_KEEPALIVE: %m"); 497 nfsdargs.sock = msgsock; 498 nfsdargs.name = (caddr_t)&inetpeer; 499 nfsdargs.namelen = sizeof(inetpeer); 500 rump_sys_nfssvc(NFSSVC_ADDSOCK, &nfsdargs); 501 (void)rump_sys_close(msgsock); 502 503#ifdef notyet 504 if (set[1].revents & POLLIN) { 505 len = sizeof(inet6peer); 506 if ((msgsock = rump_sys_accept(tcp6sock, 507 (struct sockaddr *)&inet6peer, &len, &error)) < 0) { 508 syslog(LOG_ERR, "accept failed: %m"); 509 exit(1); 510 } 511 if (rump_sys_setsockopt(msgsock, SOL_SOCKET, 512 SO_KEEPALIVE, (char *)&on, sizeof(on), &error) < 0) 513 syslog(LOG_ERR, 514 "setsockopt SO_KEEPALIVE: %m"); 515 nfsdargs.sock = msgsock; 516 nfsdargs.name = (caddr_t)&inet6peer; 517 nfsdargs.namelen = sizeof(inet6peer); 518 rump_sys_nfssvc(NFSSVC_ADDSOCK, &nfsdargs, &error); 519 (void)rump_sys_close(msgsock, &error); 520 } 521 522 if (set[2].revents & POLLIN) { 523 len = sizeof(isopeer); 524 if ((msgsock = rump_sys_accept(tp4sock, 525 (struct sockaddr *)&isopeer, &len, &error)) < 0) { 526 syslog(LOG_ERR, "accept failed: %m"); 527 exit(1); 528 } 529 if (rump_sys_setsockopt(msgsock, SOL_SOCKET, 530 SO_KEEPALIVE, (char *)&on, sizeof(on), &error) < 0) 531 syslog(LOG_ERR, 532 "setsockopt SO_KEEPALIVE: %m"); 533 nfsdargs.sock = msgsock; 534 nfsdargs.name = (caddr_t)&isopeer; 535 nfsdargs.namelen = len; 536 rump_sys_nfssvc(NFSSVC_ADDSOCK, &nfsdargs, &error); 537 (void)rump_sys_close(msgsock, &error); 538 } 539 540 if (set[3].revents & POLLIN) { 541 len = sizeof(inetpeer); 542 if ((msgsock = rump_sys_accept(tpipsock, 543 (struct sockaddr *)&inetpeer, &len)) < 0) { 544 syslog(LOG_ERR, "accept failed: %m"); 545 exit(1); 546 } 547 if (setsockopt(msgsock, SOL_SOCKET, 548 SO_KEEPALIVE, (char *)&on, sizeof(on)) < 0) 549 syslog(LOG_ERR, "setsockopt SO_KEEPALIVE: %m"); 550 nfsdargs.sock = msgsock; 551 nfsdargs.name = (caddr_t)&inetpeer; 552 nfsdargs.namelen = len; 553 rump_sys_nfssvc(NFSSVC_ADDSOCK, &nfsdargs); 554 (void)rump_sys_close(msgsock); 555 } 556#endif /* notyet */ 557 } 558} 559 560void 561usage() 562{ 563 (void)fprintf(stderr, "usage: nfsd %s\n", USAGE); 564 exit(1); 565} 566 567void 568nonfs(signo) 569 int signo; 570{ 571 syslog(LOG_ERR, "missing system call: NFS not available."); 572} 573