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/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 #include <sys/param.h>
32 #include <sys/ioctl.h>
33 #include <sys/linker.h>
34 #include <sys/module.h>
35 #include <sys/mount.h>
36 #include <sys/socket.h>
37 #include <sys/socketvar.h>
38 #include <sys/stat.h>
39 #include <sys/ucred.h>
40 #include <sys/uio.h>
41 #include <sys/vnode.h>
42 #include <sys/wait.h>
43
44 #include <nfs/nfssvc.h>
45
46 #include <rpc/rpc.h>
47
48 #include <fs/nfs/rpcv2.h>
49 #include <fs/nfs/nfsproto.h>
50 #include <fs/nfs/nfskpiport.h>
51 #include <fs/nfs/nfs.h>
52
53 #include <err.h>
54 #include <errno.h>
55 #include <fcntl.h>
56 #include <grp.h>
57 #include <netdb.h>
58 #include <pwd.h>
59 #include <signal.h>
60 #include <stdio.h>
61 #include <stdlib.h>
62 #include <string.h>
63 #include <syslog.h>
64 #include <unistd.h>
65
66 /* Global defs */
67 #ifdef DEBUG
68 #define syslog(e, s) fprintf(stderr,(s))
69 static int debug = 1;
70 #else
71 static int debug = 0;
72 #endif
73
74 static pid_t children;
75
76 static void nonfs(int);
77 static void reapchild(int);
78 static void usage(void);
79 static void cleanup(int);
80 static void child_cleanup(int);
81 static void nfscbd_exit(int);
82 static void killchildren(void);
83
84 /*
85 * Nfs callback server daemon.
86 *
87 * 1 - do file descriptor and signal cleanup
88 * 2 - fork the nfscbd(s)
89 * 4 - create callback server socket(s)
90 * 5 - set up server socket for rpc
91 *
92 * For connectionless protocols, just pass the socket into the kernel via.
93 * nfssvc().
94 * For connection based sockets, loop doing accepts. When you get a new
95 * socket from accept, pass the msgsock into the kernel via. nfssvc().
96 */
97 int
main(int argc,char * argv[])98 main(int argc, char *argv[])
99 {
100 struct nfscbd_args nfscbdargs;
101 struct nfsd_nfscbd_args nfscbdargs2;
102 struct sockaddr_in inetaddr, inetpeer;
103 fd_set ready, sockbits;
104 int ch, connect_type_cnt, len, maxsock, msgsock, error;
105 int nfssvc_flag, on, sock, tcpsock, ret, mustfreeai = 0;
106 char *cp, princname[128];
107 char myname[MAXHOSTNAMELEN], *myfqdnname = NULL;
108 struct addrinfo *aip, hints;
109 pid_t pid;
110 short myport = NFSV4_CBPORT;
111
112 if (modfind("nfscl") < 0) {
113 /* Not present in kernel, try loading it */
114 if (kldload("nfscl") < 0 ||
115 modfind("nfscl") < 0)
116 errx(1, "nfscl is not available");
117 }
118 /*
119 * First, get our fully qualified host name, if possible.
120 */
121 if (gethostname(myname, MAXHOSTNAMELEN) >= 0) {
122 cp = strchr(myname, '.');
123 if (cp != NULL && *(cp + 1) != '\0') {
124 cp = myname;
125 } else {
126 /*
127 * No domain on myname, so try looking it up.
128 */
129 cp = NULL;
130 memset((void *)&hints, 0, sizeof (hints));
131 hints.ai_flags = AI_CANONNAME;
132 error = getaddrinfo(myname, NULL, &hints, &aip);
133 if (error == 0) {
134 if (aip->ai_canonname != NULL &&
135 (cp = strchr(aip->ai_canonname, '.')) != NULL
136 && *(cp + 1) != '\0') {
137 cp = aip->ai_canonname;
138 mustfreeai = 1;
139 } else {
140 freeaddrinfo(aip);
141 }
142 }
143 }
144 if (cp == NULL)
145 warnx("Can't get fully qualified host name");
146 myfqdnname = cp;
147 }
148
149 princname[0] = '\0';
150 #define GETOPT "p:P:"
151 #define USAGE "[ -p port_num ] [ -P client_principal ]"
152 while ((ch = getopt(argc, argv, GETOPT)) != -1)
153 switch (ch) {
154 case 'p':
155 myport = atoi(optarg);
156 if (myport < 1) {
157 warnx("port# non-positive, reset to %d",
158 NFSV4_CBPORT);
159 myport = NFSV4_CBPORT;
160 }
161 break;
162 case 'P':
163 cp = optarg;
164 if (cp != NULL && strlen(cp) > 0 &&
165 strlen(cp) < sizeof (princname)) {
166 if (strchr(cp, '@') == NULL &&
167 myfqdnname != NULL)
168 snprintf(princname, sizeof (princname),
169 "%s@%s", cp, myfqdnname);
170 else
171 strlcpy(princname, cp,
172 sizeof (princname));
173 } else {
174 warnx("client princ invalid. ignored\n");
175 }
176 break;
177 default:
178 case '?':
179 usage();
180 };
181 argv += optind;
182 argc -= optind;
183
184 if (argc > 0)
185 usage();
186
187 if (mustfreeai)
188 freeaddrinfo(aip);
189 nfscbdargs2.principal = (const char *)princname;
190 if (debug == 0) {
191 daemon(0, 0);
192 (void)signal(SIGTERM, SIG_IGN);
193 (void)signal(SIGHUP, SIG_IGN);
194 (void)signal(SIGINT, SIG_IGN);
195 (void)signal(SIGQUIT, SIG_IGN);
196 }
197 (void)signal(SIGSYS, nonfs);
198 (void)signal(SIGCHLD, reapchild);
199
200 openlog("nfscbd:", LOG_PID, LOG_DAEMON);
201
202 pid = fork();
203 if (pid < 0) {
204 syslog(LOG_ERR, "fork: %m");
205 nfscbd_exit(1);
206 } else if (pid > 0) {
207 children = pid;
208 } else {
209 (void)signal(SIGUSR1, child_cleanup);
210 setproctitle("server");
211 nfssvc_flag = NFSSVC_NFSCBD;
212 if (nfssvc(nfssvc_flag, &nfscbdargs2) < 0) {
213 syslog(LOG_ERR, "nfssvc: %m");
214 nfscbd_exit(1);
215 }
216 exit(0);
217 }
218 (void)signal(SIGUSR1, cleanup);
219
220 if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
221 syslog(LOG_ERR, "can't create udp socket");
222 nfscbd_exit(1);
223 }
224 memset(&inetaddr, 0, sizeof inetaddr);
225 inetaddr.sin_family = AF_INET;
226 inetaddr.sin_addr.s_addr = INADDR_ANY;
227 inetaddr.sin_port = htons(myport);
228 inetaddr.sin_len = sizeof(inetaddr);
229 ret = bind(sock, (struct sockaddr *)&inetaddr, sizeof(inetaddr));
230 /* If bind() fails, this is a restart, so just skip UDP. */
231 if (ret == 0) {
232 len = sizeof(inetaddr);
233 if (getsockname(sock, (struct sockaddr *)&inetaddr, &len) < 0){
234 syslog(LOG_ERR, "can't get bound addr");
235 nfscbd_exit(1);
236 }
237 nfscbdargs.port = ntohs(inetaddr.sin_port);
238 if (nfscbdargs.port != myport) {
239 syslog(LOG_ERR, "BAD PORT#");
240 nfscbd_exit(1);
241 }
242 nfscbdargs.sock = sock;
243 nfscbdargs.name = NULL;
244 nfscbdargs.namelen = 0;
245 if (nfssvc(NFSSVC_CBADDSOCK, &nfscbdargs) < 0) {
246 syslog(LOG_ERR, "can't Add UDP socket");
247 nfscbd_exit(1);
248 }
249 }
250 (void)close(sock);
251
252 /* Now set up the master server socket waiting for tcp connections. */
253 on = 1;
254 FD_ZERO(&sockbits);
255 connect_type_cnt = 0;
256 if ((tcpsock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
257 syslog(LOG_ERR, "can't create tcp socket");
258 nfscbd_exit(1);
259 }
260 if (setsockopt(tcpsock,
261 SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) < 0)
262 syslog(LOG_ERR, "setsockopt SO_REUSEADDR: %m");
263 /* sin_port is already set */
264 inetaddr.sin_family = AF_INET;
265 inetaddr.sin_addr.s_addr = INADDR_ANY;
266 inetaddr.sin_port = htons(myport);
267 inetaddr.sin_len = sizeof(inetaddr);
268 if (bind(tcpsock,
269 (struct sockaddr *)&inetaddr, sizeof (inetaddr)) < 0) {
270 syslog(LOG_ERR, "can't bind tcp addr");
271 nfscbd_exit(1);
272 }
273 if (listen(tcpsock, 5) < 0) {
274 syslog(LOG_ERR, "listen failed");
275 nfscbd_exit(1);
276 }
277 FD_SET(tcpsock, &sockbits);
278 maxsock = tcpsock;
279 connect_type_cnt++;
280
281 setproctitle("master");
282
283 /*
284 * Loop forever accepting connections and passing the sockets
285 * into the kernel for the mounts.
286 */
287 for (;;) {
288 ready = sockbits;
289 if (connect_type_cnt > 1) {
290 if (select(maxsock + 1,
291 &ready, NULL, NULL, NULL) < 1) {
292 syslog(LOG_ERR, "select failed: %m");
293 nfscbd_exit(1);
294 }
295 }
296 if (FD_ISSET(tcpsock, &ready)) {
297 len = sizeof(inetpeer);
298 if ((msgsock = accept(tcpsock,
299 (struct sockaddr *)&inetpeer, &len)) < 0) {
300 syslog(LOG_ERR, "accept failed: %m");
301 nfscbd_exit(1);
302 }
303 memset(inetpeer.sin_zero, 0,
304 sizeof (inetpeer.sin_zero));
305 if (setsockopt(msgsock, SOL_SOCKET,
306 SO_KEEPALIVE, (char *)&on, sizeof(on)) < 0)
307 syslog(LOG_ERR,
308 "setsockopt SO_KEEPALIVE: %m");
309 nfscbdargs.sock = msgsock;
310 nfscbdargs.name = (caddr_t)&inetpeer;
311 nfscbdargs.namelen = sizeof(inetpeer);
312 nfssvc(NFSSVC_CBADDSOCK, &nfscbdargs);
313 (void)close(msgsock);
314 }
315 }
316 }
317
318 static void
usage(void)319 usage(void)
320 {
321
322 errx(1, "usage: nfscbd %s", USAGE);
323 }
324
325 static void
nonfs(int signo __unused)326 nonfs(int signo __unused)
327 {
328 syslog(LOG_ERR, "missing system call: NFS not available");
329 }
330
331 static void
reapchild(int signo __unused)332 reapchild(int signo __unused)
333 {
334 pid_t pid;
335
336 while ((pid = wait3(NULL, WNOHANG, NULL)) > 0) {
337 if (pid == children)
338 children = -1;
339 }
340 }
341
342 static void
killchildren(void)343 killchildren(void)
344 {
345
346 if (children > 0)
347 kill(children, SIGKILL);
348 }
349
350 /*
351 * Cleanup master after SIGUSR1.
352 */
353 static void
cleanup(int signo __unused)354 cleanup(int signo __unused)
355 {
356 nfscbd_exit(0);
357 }
358
359 /*
360 * Cleanup child after SIGUSR1.
361 */
362 static void
child_cleanup(int signo __unused)363 child_cleanup(int signo __unused)
364 {
365 exit(0);
366 }
367
368 static void
nfscbd_exit(int status __unused)369 nfscbd_exit(int status __unused)
370 {
371 killchildren();
372 exit(status);
373 }
374