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
main(int argc,char * argv[])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
usage(void)315 usage(void)
316 {
317 (void)fprintf(stderr, "usage: nfsd [-rtu] [-n num_servers]\n");
318 exit(1);
319 }
320
321 void
nonfs(int signo)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
reapchild(int signo)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