1 /* $OpenBSD: nfsd.c,v 1.28 2008/03/13 16:16:42 thib 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 const 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 const char sccsid[] = "@(#)nfsd.c 8.9 (Berkeley) 3/29/95"; 45 #else 46 static const char rcsid[] = "$OpenBSD: nfsd.c,v 1.28 2008/03/13 16:16:42 thib 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 #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 <signal.h> 74 #include <stdio.h> 75 #include <stdlib.h> 76 #include <string.h> 77 #include <syslog.h> 78 #include <unistd.h> 79 80 /* Global defs */ 81 #ifdef DEBUG 82 #define syslog(e, s) fprintf(stderr,(s)) 83 int debug = 1; 84 #else 85 int debug = 0; 86 #endif 87 88 struct nfsd_srvargs nsd; 89 90 void nonfs(int); 91 void reapchild(int); 92 void usage(void); 93 94 #define MAXNFSDCNT 20 95 #define DEFNFSDCNT 4 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 * -r - reregister with portmapper 111 * -t - support tcp nfs clients 112 * -u - support udp nfs clients 113 * followed by "n" which is the number of nfsds' to fork off 114 */ 115 int 116 main(int argc, char *argv[]) 117 { 118 struct nfsd_args nfsdargs; 119 struct sockaddr_in inetaddr, inetpeer; 120 fd_set *ready, *sockbits; 121 size_t fd_size; 122 int ch, connect_type_cnt, i, maxsock = 0, msgsock; 123 int nfsdcnt = DEFNFSDCNT, on, reregister = 0, sock; 124 int udpflag = 0, tcpflag = 0, tcpsock; 125 const char *errstr = NULL; 126 socklen_t len; 127 128 if (argc == 1) 129 udpflag = 1; 130 while ((ch = getopt(argc, argv, "n:rtu")) != -1) 131 switch (ch) { 132 case 'n': 133 nfsdcnt = strtonum(optarg, 1, MAXNFSDCNT, &errstr); 134 if (errstr) { 135 warnx("nfsd count %s %s; reset to %d", 136 optarg, errstr, DEFNFSDCNT); 137 nfsdcnt = DEFNFSDCNT; 138 } 139 break; 140 case 'r': 141 reregister = 1; 142 break; 143 case 't': 144 tcpflag = 1; 145 break; 146 case 'u': 147 udpflag = 1; 148 break; 149 default: 150 usage(); 151 }; 152 argv += optind; 153 argc -= optind; 154 155 /* 156 * XXX 157 * Backward compatibility, trailing number is the count of daemons. 158 */ 159 if (argc > 1) 160 usage(); 161 if (argc == 1) { 162 nfsdcnt = strtonum(argv[0], 1, MAXNFSDCNT, &errstr); 163 if (errstr) { 164 warnx("nfsd count %s %s; reset to %d", 165 argv[0], errstr, DEFNFSDCNT); 166 nfsdcnt = DEFNFSDCNT; 167 } 168 } 169 170 if (debug == 0) { 171 daemon(0, 0); 172 (void)signal(SIGHUP, SIG_IGN); 173 (void)signal(SIGINT, SIG_IGN); 174 (void)signal(SIGQUIT, SIG_IGN); 175 (void)signal(SIGSYS, nonfs); 176 } 177 (void)signal(SIGCHLD, reapchild); 178 179 if (reregister) { 180 if (udpflag && 181 (!pmap_set(RPCPROG_NFS, 2, IPPROTO_UDP, NFS_PORT) || 182 !pmap_set(RPCPROG_NFS, 3, IPPROTO_UDP, NFS_PORT))) 183 err(1, "can't register with portmap for UDP."); 184 if (tcpflag && 185 (!pmap_set(RPCPROG_NFS, 2, IPPROTO_TCP, NFS_PORT) || 186 !pmap_set(RPCPROG_NFS, 3, IPPROTO_TCP, NFS_PORT))) 187 err(1, "can't register with portmap for TCP."); 188 return (0); 189 } 190 openlog("nfsd", LOG_PID, LOG_DAEMON); 191 192 for (i = 0; i < nfsdcnt; i++) { 193 switch (fork()) { 194 case -1: 195 syslog(LOG_ERR, "fork: %m"); 196 return (1); 197 case 0: 198 break; 199 default: 200 continue; 201 } 202 203 setproctitle("server"); 204 nsd.nsd_nfsd = NULL; 205 if (nfssvc(NFSSVC_NFSD, &nsd) < 0) { 206 syslog(LOG_ERR, "nfssvc: %m"); 207 return (1); 208 } 209 return (0); 210 } 211 212 /* If we are serving udp, set up the socket. */ 213 if (udpflag) { 214 if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 215 syslog(LOG_ERR, "can't create udp socket"); 216 return (1); 217 } 218 memset(&inetaddr, 0, sizeof inetaddr); 219 inetaddr.sin_family = AF_INET; 220 inetaddr.sin_addr.s_addr = INADDR_ANY; 221 inetaddr.sin_port = htons(NFS_PORT); 222 inetaddr.sin_len = sizeof(inetaddr); 223 if (bind(sock, (struct sockaddr *)&inetaddr, 224 sizeof(inetaddr)) < 0) { 225 syslog(LOG_ERR, "can't bind udp addr"); 226 return (1); 227 } 228 if (!pmap_set(RPCPROG_NFS, 2, IPPROTO_UDP, NFS_PORT) || 229 !pmap_set(RPCPROG_NFS, 3, IPPROTO_UDP, NFS_PORT)) { 230 syslog(LOG_ERR, "can't register with udp portmap"); 231 return (1); 232 } 233 nfsdargs.sock = sock; 234 nfsdargs.name = NULL; 235 nfsdargs.namelen = 0; 236 if (nfssvc(NFSSVC_ADDSOCK, &nfsdargs) < 0) { 237 syslog(LOG_ERR, "can't Add UDP socket"); 238 return (1); 239 } 240 (void)close(sock); 241 } 242 243 /* Now set up the master server socket waiting for tcp connections. */ 244 on = 1; 245 connect_type_cnt = 0; 246 if (tcpflag) { 247 if ((tcpsock = socket(AF_INET, SOCK_STREAM, 0)) < 0) { 248 syslog(LOG_ERR, "can't create tcp socket"); 249 return (1); 250 } 251 if (setsockopt(tcpsock, 252 SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 253 syslog(LOG_ERR, "setsockopt SO_REUSEADDR: %m"); 254 memset(&inetaddr, 0, sizeof inetaddr); 255 inetaddr.sin_family = AF_INET; 256 inetaddr.sin_addr.s_addr = INADDR_ANY; 257 inetaddr.sin_port = htons(NFS_PORT); 258 inetaddr.sin_len = sizeof(inetaddr); 259 if (bind(tcpsock, (struct sockaddr *)&inetaddr, 260 sizeof (inetaddr)) < 0) { 261 syslog(LOG_ERR, "can't bind tcp addr"); 262 return (1); 263 } 264 if (listen(tcpsock, 5) < 0) { 265 syslog(LOG_ERR, "listen failed"); 266 return (1); 267 } 268 if (!pmap_set(RPCPROG_NFS, 2, IPPROTO_TCP, NFS_PORT) || 269 !pmap_set(RPCPROG_NFS, 3, IPPROTO_TCP, NFS_PORT)) { 270 syslog(LOG_ERR, "can't register tcp with portmap"); 271 return (1); 272 } 273 maxsock = tcpsock; 274 connect_type_cnt++; 275 } 276 277 if (connect_type_cnt == 0) 278 return (0); 279 280 setproctitle("master"); 281 282 /* 283 * Allocate space for the fd_set pointers and fill in sockbits 284 */ 285 fd_size = howmany(maxsock + 1, NFDBITS) * sizeof(fd_mask); 286 sockbits = malloc(fd_size); 287 ready = malloc(fd_size); 288 if (sockbits == NULL || ready == NULL) { 289 syslog(LOG_ERR, "cannot allocate memory"); 290 return (1); 291 } 292 memset(sockbits, 0, fd_size); 293 if (tcpflag) 294 FD_SET(tcpsock, sockbits); 295 296 /* 297 * Loop forever accepting connections and passing the sockets 298 * into the kernel for the mounts. 299 */ 300 for (;;) { 301 memcpy(ready, sockbits, fd_size); 302 if (connect_type_cnt > 1) { 303 if (select(maxsock + 1, 304 ready, NULL, NULL, NULL) < 1) { 305 syslog(LOG_ERR, "select failed: %m"); 306 return (1); 307 } 308 } 309 if (tcpflag && FD_ISSET(tcpsock, ready)) { 310 len = sizeof(inetpeer); 311 if ((msgsock = accept(tcpsock, 312 (struct sockaddr *)&inetpeer, &len)) < 0) { 313 syslog(LOG_ERR, "accept failed: %m"); 314 return (1); 315 } 316 memset(inetpeer.sin_zero, 0, sizeof(inetpeer.sin_zero)); 317 if (setsockopt(msgsock, SOL_SOCKET, 318 SO_KEEPALIVE, &on, sizeof(on)) < 0) 319 syslog(LOG_ERR, 320 "setsockopt SO_KEEPALIVE: %m"); 321 nfsdargs.sock = msgsock; 322 nfsdargs.name = (caddr_t)&inetpeer; 323 nfsdargs.namelen = sizeof(inetpeer); 324 if (nfssvc(NFSSVC_ADDSOCK, &nfsdargs) < 0) { 325 syslog(LOG_ERR, "can't Add TCP socket"); 326 return (1); 327 } 328 (void)close(msgsock); 329 } 330 } 331 } 332 333 void 334 usage(void) 335 { 336 (void)fprintf(stderr, "usage: nfsd [-rtu] [-n num_servers]\n"); 337 exit(1); 338 } 339 340 /* ARGSUSED */ 341 void 342 nonfs(int signo) 343 { 344 int save_errno = errno; 345 struct syslog_data sdata = SYSLOG_DATA_INIT; 346 347 syslog_r(LOG_ERR, &sdata, "missing system call: NFS not available."); 348 errno = save_errno; 349 } 350 351 /* ARGSUSED */ 352 void 353 reapchild(int signo) 354 { 355 int save_errno = errno; 356 357 while (wait3(NULL, WNOHANG, NULL) > 0) 358 ; 359 errno = save_errno; 360 } 361