1 /*-
2 * Copyright (c) 2009 Rick Macklem, University of Guelph
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 */
27
28 #include <sys/param.h>
29 #include <sys/ioctl.h>
30 #include <sys/linker.h>
31 #include <sys/module.h>
32 #include <sys/mount.h>
33 #include <sys/socket.h>
34 #include <sys/socketvar.h>
35 #include <sys/stat.h>
36 #include <sys/ucred.h>
37 #include <sys/uio.h>
38 #include <sys/vnode.h>
39 #include <sys/wait.h>
40
41 #include <nfs/nfssvc.h>
42
43 #include <rpc/rpc.h>
44
45 #include <fs/nfs/rpcv2.h>
46 #include <fs/nfs/nfsproto.h>
47 #include <fs/nfs/nfskpiport.h>
48 #include <fs/nfs/nfs.h>
49
50 #include <err.h>
51 #include <errno.h>
52 #include <fcntl.h>
53 #include <grp.h>
54 #include <netdb.h>
55 #include <pwd.h>
56 #include <signal.h>
57 #include <stdio.h>
58 #include <stdlib.h>
59 #include <string.h>
60 #include <syslog.h>
61 #include <unistd.h>
62
63 /* Global defs */
64 #ifdef DEBUG
65 #define syslog(e, s) fprintf(stderr,(s))
66 static int debug = 1;
67 #else
68 static int debug = 0;
69 #endif
70
71 static pid_t children;
72
73 static void nonfs(int);
74 static void reapchild(int);
75 static void usage(void);
76 static void cleanup(int);
77 static void child_cleanup(int);
78 static void nfscbd_exit(int);
79 static void killchildren(void);
80
81 /*
82 * Nfs callback server daemon.
83 *
84 * 1 - do file descriptor and signal cleanup
85 * 2 - fork the nfscbd(s)
86 * 4 - create callback server socket(s)
87 * 5 - set up server socket for rpc
88 *
89 * For connectionless protocols, just pass the socket into the kernel via.
90 * nfssvc().
91 * For connection based sockets, loop doing accepts. When you get a new
92 * socket from accept, pass the msgsock into the kernel via. nfssvc().
93 */
94 int
main(int argc,char * argv[])95 main(int argc, char *argv[])
96 {
97 struct nfscbd_args nfscbdargs;
98 struct nfsd_nfscbd_args nfscbdargs2;
99 struct sockaddr_in inetaddr, inetpeer;
100 fd_set ready, sockbits;
101 int ch, connect_type_cnt, maxsock, msgsock, error;
102 int nfssvc_flag, on, sock, tcpsock, ret, mustfreeai = 0;
103 char *cp, princname[128];
104 char myname[MAXHOSTNAMELEN], *myfqdnname = NULL;
105 struct addrinfo *aip, hints;
106 pid_t pid;
107 short myport = NFSV4_CBPORT;
108 socklen_t len;
109
110 if (modfind("nfscl") < 0) {
111 /* Not present in kernel, try loading it */
112 if (kldload("nfscl") < 0 ||
113 modfind("nfscl") < 0)
114 errx(1, "nfscl is not available");
115 }
116 /*
117 * First, get our fully qualified host name, if possible.
118 */
119 if (gethostname(myname, MAXHOSTNAMELEN) >= 0) {
120 cp = strchr(myname, '.');
121 if (cp != NULL && *(cp + 1) != '\0') {
122 cp = myname;
123 } else {
124 /*
125 * No domain on myname, so try looking it up.
126 */
127 cp = NULL;
128 memset((void *)&hints, 0, sizeof (hints));
129 hints.ai_flags = AI_CANONNAME;
130 error = getaddrinfo(myname, NULL, &hints, &aip);
131 if (error == 0) {
132 if (aip->ai_canonname != NULL &&
133 (cp = strchr(aip->ai_canonname, '.')) != NULL
134 && *(cp + 1) != '\0') {
135 cp = aip->ai_canonname;
136 mustfreeai = 1;
137 } else {
138 freeaddrinfo(aip);
139 }
140 }
141 }
142 if (cp == NULL)
143 warnx("Can't get fully qualified host name");
144 myfqdnname = cp;
145 }
146
147 princname[0] = '\0';
148 #define GETOPT "p:P:"
149 #define USAGE "[ -p port_num ] [ -P client_principal ]"
150 while ((ch = getopt(argc, argv, GETOPT)) != -1)
151 switch (ch) {
152 case 'p':
153 myport = atoi(optarg);
154 if (myport < 1) {
155 warnx("port# non-positive, reset to %d",
156 NFSV4_CBPORT);
157 myport = NFSV4_CBPORT;
158 }
159 break;
160 case 'P':
161 cp = optarg;
162 if (cp != NULL && strlen(cp) > 0 &&
163 strlen(cp) < sizeof (princname)) {
164 if (strchr(cp, '@') == NULL &&
165 myfqdnname != NULL)
166 snprintf(princname, sizeof (princname),
167 "%s@%s", cp, myfqdnname);
168 else
169 strlcpy(princname, cp,
170 sizeof (princname));
171 } else {
172 warnx("client princ invalid. ignored\n");
173 }
174 break;
175 default:
176 case '?':
177 usage();
178 }
179 argv += optind;
180 argc -= optind;
181
182 if (argc > 0)
183 usage();
184
185 if (mustfreeai)
186 freeaddrinfo(aip);
187 nfscbdargs2.principal = (const char *)princname;
188 if (debug == 0) {
189 daemon(0, 0);
190 (void)signal(SIGTERM, SIG_IGN);
191 (void)signal(SIGHUP, SIG_IGN);
192 (void)signal(SIGINT, SIG_IGN);
193 (void)signal(SIGQUIT, SIG_IGN);
194 }
195 (void)signal(SIGSYS, nonfs);
196 (void)signal(SIGCHLD, reapchild);
197
198 openlog("nfscbd:", LOG_PID, LOG_DAEMON);
199
200 pid = fork();
201 if (pid < 0) {
202 syslog(LOG_ERR, "fork: %m");
203 nfscbd_exit(1);
204 } else if (pid > 0) {
205 children = pid;
206 } else {
207 (void)signal(SIGUSR1, child_cleanup);
208 setproctitle("server");
209 nfssvc_flag = NFSSVC_NFSCBD;
210 if (nfssvc(nfssvc_flag, &nfscbdargs2) < 0) {
211 syslog(LOG_ERR, "nfssvc: %m");
212 nfscbd_exit(1);
213 }
214 exit(0);
215 }
216 (void)signal(SIGUSR1, cleanup);
217
218 if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
219 syslog(LOG_ERR, "can't create udp socket");
220 nfscbd_exit(1);
221 }
222 memset(&inetaddr, 0, sizeof inetaddr);
223 inetaddr.sin_family = AF_INET;
224 inetaddr.sin_addr.s_addr = INADDR_ANY;
225 inetaddr.sin_port = htons(myport);
226 inetaddr.sin_len = sizeof(inetaddr);
227 ret = bind(sock, (struct sockaddr *)&inetaddr, sizeof(inetaddr));
228 /* If bind() fails, this is a restart, so just skip UDP. */
229 if (ret == 0) {
230 len = sizeof(inetaddr);
231 if (getsockname(sock, (struct sockaddr *)&inetaddr, &len) < 0){
232 syslog(LOG_ERR, "can't get bound addr");
233 nfscbd_exit(1);
234 }
235 nfscbdargs.port = ntohs(inetaddr.sin_port);
236 if (nfscbdargs.port != myport) {
237 syslog(LOG_ERR, "BAD PORT#");
238 nfscbd_exit(1);
239 }
240 nfscbdargs.sock = sock;
241 nfscbdargs.name = NULL;
242 nfscbdargs.namelen = 0;
243 if (nfssvc(NFSSVC_CBADDSOCK, &nfscbdargs) < 0) {
244 syslog(LOG_ERR, "can't Add UDP socket");
245 nfscbd_exit(1);
246 }
247 }
248 (void)close(sock);
249
250 /* Now set up the master server socket waiting for tcp connections. */
251 on = 1;
252 FD_ZERO(&sockbits);
253 connect_type_cnt = 0;
254 if ((tcpsock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
255 syslog(LOG_ERR, "can't create tcp socket");
256 nfscbd_exit(1);
257 }
258 if (setsockopt(tcpsock,
259 SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) < 0)
260 syslog(LOG_ERR, "setsockopt SO_REUSEADDR: %m");
261 /* sin_port is already set */
262 inetaddr.sin_family = AF_INET;
263 inetaddr.sin_addr.s_addr = INADDR_ANY;
264 inetaddr.sin_port = htons(myport);
265 inetaddr.sin_len = sizeof(inetaddr);
266 if (bind(tcpsock,
267 (struct sockaddr *)&inetaddr, sizeof (inetaddr)) < 0) {
268 syslog(LOG_ERR, "can't bind tcp addr");
269 nfscbd_exit(1);
270 }
271 if (listen(tcpsock, 5) < 0) {
272 syslog(LOG_ERR, "listen failed");
273 nfscbd_exit(1);
274 }
275 FD_SET(tcpsock, &sockbits);
276 maxsock = tcpsock;
277 connect_type_cnt++;
278
279 setproctitle("master");
280
281 /*
282 * Loop forever accepting connections and passing the sockets
283 * into the kernel for the mounts.
284 */
285 for (;;) {
286 ready = sockbits;
287 if (connect_type_cnt > 1) {
288 if (select(maxsock + 1,
289 &ready, NULL, NULL, NULL) < 1) {
290 syslog(LOG_ERR, "select failed: %m");
291 nfscbd_exit(1);
292 }
293 }
294 if (FD_ISSET(tcpsock, &ready)) {
295 len = sizeof(inetpeer);
296 if ((msgsock = accept(tcpsock,
297 (struct sockaddr *)&inetpeer, &len)) < 0) {
298 syslog(LOG_ERR, "accept failed: %m");
299 nfscbd_exit(1);
300 }
301 memset(inetpeer.sin_zero, 0,
302 sizeof (inetpeer.sin_zero));
303 if (setsockopt(msgsock, SOL_SOCKET,
304 SO_KEEPALIVE, (char *)&on, sizeof(on)) < 0)
305 syslog(LOG_ERR,
306 "setsockopt SO_KEEPALIVE: %m");
307 nfscbdargs.sock = msgsock;
308 nfscbdargs.name = (caddr_t)&inetpeer;
309 nfscbdargs.namelen = sizeof(inetpeer);
310 nfssvc(NFSSVC_CBADDSOCK, &nfscbdargs);
311 (void)close(msgsock);
312 }
313 }
314 }
315
316 static void
usage(void)317 usage(void)
318 {
319
320 errx(1, "usage: nfscbd %s", USAGE);
321 }
322
323 static void
nonfs(int signo __unused)324 nonfs(int signo __unused)
325 {
326 syslog(LOG_ERR, "missing system call: NFS not available");
327 }
328
329 static void
reapchild(int signo __unused)330 reapchild(int signo __unused)
331 {
332 pid_t pid;
333
334 while ((pid = wait3(NULL, WNOHANG, NULL)) > 0) {
335 if (pid == children)
336 children = -1;
337 }
338 }
339
340 static void
killchildren(void)341 killchildren(void)
342 {
343
344 if (children > 0)
345 kill(children, SIGKILL);
346 }
347
348 /*
349 * Cleanup master after SIGUSR1.
350 */
351 static void
cleanup(int signo __unused)352 cleanup(int signo __unused)
353 {
354 nfscbd_exit(0);
355 }
356
357 /*
358 * Cleanup child after SIGUSR1.
359 */
360 static void
child_cleanup(int signo __unused)361 child_cleanup(int signo __unused)
362 {
363 exit(0);
364 }
365
366 static void
nfscbd_exit(int status __unused)367 nfscbd_exit(int status __unused)
368 {
369 killchildren();
370 exit(status);
371 }
372