1 /* $OpenBSD: nfsd.c,v 1.45 2025/01/16 12:46:03 kn 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 #include <sys/ioctl.h> 37 #include <sys/stat.h> 38 #include <sys/wait.h> 39 #include <sys/uio.h> 40 #include <sys/ucred.h> 41 #include <sys/mount.h> 42 #include <sys/socket.h> 43 44 #include <rpc/rpc.h> 45 #include <rpc/pmap_clnt.h> 46 #include <rpc/pmap_prot.h> 47 48 #include <nfs/rpcv2.h> 49 #include <nfs/nfsproto.h> 50 #include <nfs/nfs.h> 51 52 #include <err.h> 53 #include <errno.h> 54 #include <fcntl.h> 55 #include <grp.h> 56 #include <pwd.h> 57 #include <signal.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #include <syslog.h> 62 #include <unistd.h> 63 64 /* Global defs */ 65 #ifdef DEBUG 66 #define syslog(e, s, ...) \ 67 do { \ 68 fprintf(stderr, (s), ##__VA_ARGS__); \ 69 fprintf(stderr, "\n"); \ 70 } while (0) 71 int debug = 1; 72 #else 73 int debug = 0; 74 #endif 75 76 struct nfsd_srvargs nsd; 77 78 void nonfs(int); 79 void reapchild(int); 80 void usage(void); 81 82 #define MAXNFSDCNT 20 83 #define DEFNFSDCNT 4 84 85 /* 86 * Nfs server daemon mostly just a user context for nfssvc() 87 * 88 * 1 - do file descriptor and signal cleanup 89 * 2 - fork the nfsd(s) 90 * 3 - create server socket(s) 91 * 4 - register socket with portmap 92 * 93 * For connectionless protocols, just pass the socket into the kernel via. 94 * nfssvc(). 95 * For connection based sockets, loop doing accepts. When you get a new 96 * socket from accept, pass the msgsock into the kernel via. nfssvc(). 97 * The arguments are: 98 * -r - reregister with portmapper 99 * -t - support tcp nfs clients 100 * -u - support udp nfs clients 101 * followed by "n" which is the number of nfsds' to fork off 102 */ 103 int 104 main(int argc, char *argv[]) 105 { 106 struct nfsd_args nfsdargs; 107 struct sockaddr_in inetaddr; 108 int ch, i; 109 int nfsdcnt = DEFNFSDCNT, on, reregister = 0, sock; 110 int udpflag = 0, tcpflag = 0, tcpsock; 111 const char *errstr = NULL; 112 113 /* Start by writing to both console and log. */ 114 openlog("nfsd", LOG_PID | LOG_PERROR, LOG_DAEMON); 115 116 if (unveil("/", "") == -1) { 117 syslog(LOG_ERR, "unveil /: %s", strerror(errno)); 118 return (1); 119 } 120 if (unveil(NULL, NULL) == -1) { 121 syslog(LOG_ERR, "unveil: %s", strerror(errno)); 122 return (1); 123 } 124 125 while ((ch = getopt(argc, argv, "n:rtu")) != -1) 126 switch (ch) { 127 case 'n': 128 nfsdcnt = strtonum(optarg, 1, MAXNFSDCNT, &errstr); 129 if (errstr) { 130 syslog(LOG_ERR, "nfsd count is %s: %s", errstr, optarg); 131 return(1); 132 } 133 break; 134 case 'r': 135 reregister = 1; 136 break; 137 case 't': 138 tcpflag = 1; 139 break; 140 case 'u': 141 udpflag = 1; 142 break; 143 default: 144 usage(); 145 } 146 argv += optind; 147 argc -= optind; 148 149 if (!(tcpflag || udpflag)) 150 udpflag = 1; 151 152 /* 153 * XXX 154 * Backward compatibility, trailing number is the count of daemons. 155 */ 156 if (argc > 1) 157 usage(); 158 if (argc == 1) { 159 nfsdcnt = strtonum(argv[0], 1, MAXNFSDCNT, &errstr); 160 if (errstr) { 161 syslog(LOG_ERR, "nfsd count is %s: %s", errstr, optarg); 162 return(1); 163 } 164 } 165 166 if (debug == 0) { 167 daemon(0, 0); 168 (void)signal(SIGHUP, SIG_IGN); 169 (void)signal(SIGINT, SIG_IGN); 170 (void)signal(SIGQUIT, SIG_IGN); 171 (void)signal(SIGSYS, nonfs); 172 } 173 (void)signal(SIGCHLD, reapchild); 174 175 if (reregister) { 176 if (udpflag && 177 (!pmap_set(RPCPROG_NFS, 2, IPPROTO_UDP, NFS_PORT) || 178 !pmap_set(RPCPROG_NFS, 3, IPPROTO_UDP, NFS_PORT))) { 179 syslog(LOG_ERR, "can't register with portmap for UDP (%s).", 180 strerror(errno)); 181 return (1); 182 } 183 if (tcpflag && 184 (!pmap_set(RPCPROG_NFS, 2, IPPROTO_TCP, NFS_PORT) || 185 !pmap_set(RPCPROG_NFS, 3, IPPROTO_TCP, NFS_PORT))) { 186 syslog(LOG_ERR, "can't register with portmap for TCP (%s).", 187 strerror(errno)); 188 return (1); 189 } 190 return (0); 191 } 192 193 /* Cut back to writing to log only. */ 194 closelog(); 195 openlog("nfsd", LOG_PID, LOG_DAEMON); 196 197 for (i = 0; i < nfsdcnt; i++) { 198 switch (fork()) { 199 case -1: 200 syslog(LOG_ERR, "fork: %s", strerror(errno)); 201 return (1); 202 case 0: 203 break; 204 default: 205 continue; 206 } 207 208 setproctitle("server"); 209 nsd.nsd_nfsd = NULL; 210 if (nfssvc(NFSSVC_NFSD, &nsd) == -1) { 211 syslog(LOG_ERR, "nfssvc: %s", strerror(errno)); 212 return (1); 213 } 214 return (0); 215 } 216 217 /* If we are serving udp, set up the socket. */ 218 if (udpflag) { 219 if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) { 220 syslog(LOG_ERR, "can't create udp socket"); 221 return (1); 222 } 223 memset(&inetaddr, 0, sizeof inetaddr); 224 inetaddr.sin_family = AF_INET; 225 inetaddr.sin_addr.s_addr = INADDR_ANY; 226 inetaddr.sin_port = htons(NFS_PORT); 227 inetaddr.sin_len = sizeof(inetaddr); 228 if (bind(sock, (struct sockaddr *)&inetaddr, 229 sizeof(inetaddr)) == -1) { 230 syslog(LOG_ERR, "can't bind udp addr"); 231 return (1); 232 } 233 if (!pmap_set(RPCPROG_NFS, 2, IPPROTO_UDP, NFS_PORT) || 234 !pmap_set(RPCPROG_NFS, 3, IPPROTO_UDP, NFS_PORT)) { 235 syslog(LOG_ERR, "can't register with udp portmap"); 236 return (1); 237 } 238 nfsdargs.sock = sock; 239 nfsdargs.name = NULL; 240 nfsdargs.namelen = 0; 241 if (nfssvc(NFSSVC_ADDSOCK, &nfsdargs) == -1) { 242 syslog(LOG_ERR, "can't Add UDP socket"); 243 return (1); 244 } 245 (void)close(sock); 246 } 247 248 /* Now set up the master server socket waiting for tcp connections. */ 249 on = 1; 250 if (!tcpflag) 251 return (0); 252 253 if ((tcpsock = socket(AF_INET, SOCK_STREAM, 0)) == -1) { 254 syslog(LOG_ERR, "can't create tcp socket"); 255 return (1); 256 } 257 if (setsockopt(tcpsock, 258 SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) 259 syslog(LOG_ERR, "setsockopt SO_REUSEADDR: %s", strerror(errno)); 260 memset(&inetaddr, 0, sizeof inetaddr); 261 inetaddr.sin_family = AF_INET; 262 inetaddr.sin_addr.s_addr = INADDR_ANY; 263 inetaddr.sin_port = htons(NFS_PORT); 264 inetaddr.sin_len = sizeof(inetaddr); 265 if (bind(tcpsock, (struct sockaddr *)&inetaddr, 266 sizeof (inetaddr)) == -1) { 267 syslog(LOG_ERR, "can't bind tcp addr"); 268 return (1); 269 } 270 if (listen(tcpsock, 5) == -1) { 271 syslog(LOG_ERR, "listen failed"); 272 return (1); 273 } 274 if (!pmap_set(RPCPROG_NFS, 2, IPPROTO_TCP, NFS_PORT) || 275 !pmap_set(RPCPROG_NFS, 3, IPPROTO_TCP, NFS_PORT)) { 276 syslog(LOG_ERR, "can't register tcp with portmap"); 277 return (1); 278 } 279 280 setproctitle("master"); 281 282 /* 283 * Loop forever accepting connections and passing the sockets 284 * into the kernel for the mounts. 285 */ 286 for (;;) { 287 struct sockaddr_in inetpeer; 288 int ret, msgsock; 289 socklen_t len = sizeof(inetpeer); 290 291 if ((msgsock = accept(tcpsock, 292 (struct sockaddr *)&inetpeer, &len)) == -1) { 293 if (errno == EWOULDBLOCK || errno == EINTR || 294 errno == ECONNABORTED) 295 continue; 296 syslog(LOG_ERR, "accept failed: %s", strerror(errno)); 297 return (1); 298 } 299 memset(inetpeer.sin_zero, 0, sizeof(inetpeer.sin_zero)); 300 if (setsockopt(msgsock, SOL_SOCKET, 301 SO_KEEPALIVE, &on, sizeof(on)) == -1) 302 syslog(LOG_ERR, 303 "setsockopt SO_KEEPALIVE: %s", strerror(errno)); 304 nfsdargs.sock = msgsock; 305 nfsdargs.name = (caddr_t)&inetpeer; 306 nfsdargs.namelen = len; 307 if (nfssvc(NFSSVC_ADDSOCK, &nfsdargs) == -1) { 308 syslog(LOG_ERR, "can't Add TCP socket"); 309 } 310 (void)close(msgsock); 311 } 312 } 313 314 void 315 usage(void) 316 { 317 (void)fprintf(stderr, "usage: nfsd [-rtu] [-n num_servers]\n"); 318 exit(1); 319 } 320 321 void 322 nonfs(int signo) 323 { 324 int save_errno = errno; 325 struct syslog_data sdata = SYSLOG_DATA_INIT; 326 327 syslog_r(LOG_ERR, &sdata, "missing system call: NFS not available."); 328 errno = save_errno; 329 } 330 331 void 332 reapchild(int signo) 333 { 334 int save_errno = errno; 335 336 while (wait3(NULL, WNOHANG, NULL) > 0) 337 continue; 338 errno = save_errno; 339 } 340