aboutsummaryrefslogtreecommitdiff
path: root/usr.sbin/nfscbd/nfscbd.c
blob: ba093118888cd402e0bf6ecd101594e4d9b07f6d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
/*-
 * Copyright (c) 2009 Rick Macklem, University of Guelph
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/linker.h>
#include <sys/module.h>
#include <sys/mount.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/stat.h>
#include <sys/ucred.h>
#include <sys/uio.h>
#include <sys/vnode.h>
#include <sys/wait.h>

#include <nfs/nfssvc.h>

#include <rpc/rpc.h>

#include <fs/nfs/rpcv2.h>
#include <fs/nfs/nfsproto.h>
#include <fs/nfs/nfskpiport.h>
#include <fs/nfs/nfs.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <netdb.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>

/* Global defs */
#ifdef DEBUG
#define	syslog(e, s)	fprintf(stderr,(s))
int	debug = 1;
#else
int	debug = 0;
#endif

pid_t children;

static void	nonfs(int);
static void	reapchild(int);
static void	usage(void);
static void	cleanup(int);
static void	child_cleanup(int);
static void	nfscbd_exit(int);
static void	killchildren(void);

/*
 * Nfs callback server daemon.
 *
 * 1 - do file descriptor and signal cleanup
 * 2 - fork the nfscbd(s)
 * 4 - create callback server socket(s)
 * 5 - set up server socket for rpc
 *
 * For connectionless protocols, just pass the socket into the kernel via.
 * nfssvc().
 * For connection based sockets, loop doing accepts. When you get a new
 * socket from accept, pass the msgsock into the kernel via. nfssvc().
 */
int
main(int argc, char *argv[])
{
	struct nfscbd_args nfscbdargs;
	struct nfsd_nfscbd_args nfscbdargs2;
	struct sockaddr_in inetaddr, inetpeer;
	fd_set ready, sockbits;
	int ch, connect_type_cnt, len, maxsock, msgsock, error;
	int nfssvc_flag, on, sock, tcpsock, ret, mustfreeai = 0;
	char *cp, princname[128];
	char myname[MAXHOSTNAMELEN], *myfqdnname = NULL;
	struct addrinfo *aip, hints;
	pid_t pid;
	short myport = NFSV4_CBPORT;

	if (modfind("nfscl") < 0) {
		/* Not present in kernel, try loading it */
		if (kldload("nfscl") < 0 ||
		    modfind("nfscl") < 0)
			errx(1, "nfscl is not available");
	}
	/*
	 * First, get our fully qualified host name, if possible.
	 */
	if (gethostname(myname, MAXHOSTNAMELEN) >= 0) {
		cp = strchr(myname, '.');
		if (cp != NULL && *(cp + 1) != '\0') {
			cp = myname;
		} else {
			/*
			 * No domain on myname, so try looking it up.
			 */
			cp = NULL;
			memset((void *)&hints, 0, sizeof (hints));
			hints.ai_flags = AI_CANONNAME;
			error = getaddrinfo(myname, NULL, &hints, &aip);
			if (error == 0) {
			    if (aip->ai_canonname != NULL &&
				(cp = strchr(aip->ai_canonname, '.')) != NULL
				&& *(cp + 1) != '\0') {
				    cp = aip->ai_canonname;
				    mustfreeai = 1;
			    } else {
				    freeaddrinfo(aip);
			    }
			}
		}
		if (cp == NULL)
			warnx("Can't get fully qualified host name");
		myfqdnname = cp;
	}

	princname[0] = '\0';
#define	GETOPT	"p:P:"
#define	USAGE	"[ -p port_num ] [ -P client_principal ]"
	while ((ch = getopt(argc, argv, GETOPT)) != -1)
		switch (ch) {
		case 'p':
			myport = atoi(optarg);
			if (myport < 1) {
				warnx("port# non-positive, reset to %d",
				    NFSV4_CBPORT);
				myport = NFSV4_CBPORT;
			}
			break;
		case 'P':
			cp = optarg;
			if (cp != NULL && strlen(cp) > 0 &&
			    strlen(cp) < sizeof (princname)) {
				if (strchr(cp, '@') == NULL &&
				    myfqdnname != NULL)
					snprintf(princname, sizeof (princname),
					    "%s@%s", cp, myfqdnname);
				else
					strlcpy(princname, cp,
					    sizeof (princname));
			} else {
				warnx("client princ invalid. ignored\n");
			}
			break;
		default:
		case '?':
			usage();
		};
	argv += optind;
	argc -= optind;

	if (argc > 0)
		usage();

	if (mustfreeai)
		freeaddrinfo(aip);
	nfscbdargs2.principal = (const char *)princname;
	if (debug == 0) {
		daemon(0, 0);
		(void)signal(SIGTERM, SIG_IGN);
		(void)signal(SIGHUP, SIG_IGN);
		(void)signal(SIGINT, SIG_IGN);
		(void)signal(SIGQUIT, SIG_IGN);
	}
	(void)signal(SIGSYS, nonfs);
	(void)signal(SIGCHLD, reapchild);

	openlog("nfscbd:", LOG_PID, LOG_DAEMON);

	pid = fork();
	if (pid < 0) {
		syslog(LOG_ERR, "fork: %m");
		nfscbd_exit(1);
	} else if (pid > 0) {
		children = pid;
	} else {
		(void)signal(SIGUSR1, child_cleanup);
		setproctitle("server");
		nfssvc_flag = NFSSVC_NFSCBD;
		if (nfssvc(nfssvc_flag, &nfscbdargs2) < 0) {
			syslog(LOG_ERR, "nfssvc: %m");
			nfscbd_exit(1);
		}
		exit(0);
	}
	(void)signal(SIGUSR1, cleanup);

	if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
		syslog(LOG_ERR, "can't create udp socket");
		nfscbd_exit(1);
	}
	memset(&inetaddr, 0, sizeof inetaddr);
	inetaddr.sin_family = AF_INET;
	inetaddr.sin_addr.s_addr = INADDR_ANY;
	inetaddr.sin_port = htons(myport);
	inetaddr.sin_len = sizeof(inetaddr);
	ret = bind(sock, (struct sockaddr *)&inetaddr, sizeof(inetaddr));
	/* If bind() fails, this is a restart, so just skip UDP. */
	if (ret == 0) {
		len = sizeof(inetaddr);
		if (getsockname(sock, (struct sockaddr *)&inetaddr, &len) < 0){
			syslog(LOG_ERR, "can't get bound addr");
			nfscbd_exit(1);
		}
		nfscbdargs.port = ntohs(inetaddr.sin_port);
		if (nfscbdargs.port != myport) {
			syslog(LOG_ERR, "BAD PORT#");
			nfscbd_exit(1);
		}
		nfscbdargs.sock = sock;
		nfscbdargs.name = NULL;
		nfscbdargs.namelen = 0;
		if (nfssvc(NFSSVC_CBADDSOCK, &nfscbdargs) < 0) {
			syslog(LOG_ERR, "can't Add UDP socket");
			nfscbd_exit(1);
		}
	}
	(void)close(sock);

	/* Now set up the master server socket waiting for tcp connections. */
	on = 1;
	FD_ZERO(&sockbits);
	connect_type_cnt = 0;
	if ((tcpsock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
		syslog(LOG_ERR, "can't create tcp socket");
		nfscbd_exit(1);
	}
	if (setsockopt(tcpsock,
	    SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) < 0)
		syslog(LOG_ERR, "setsockopt SO_REUSEADDR: %m");
	/* sin_port is already set */
	inetaddr.sin_family = AF_INET;
	inetaddr.sin_addr.s_addr = INADDR_ANY;
	inetaddr.sin_port = htons(myport);
	inetaddr.sin_len = sizeof(inetaddr);
	if (bind(tcpsock,
	    (struct sockaddr *)&inetaddr, sizeof (inetaddr)) < 0) {
		syslog(LOG_ERR, "can't bind tcp addr");
		nfscbd_exit(1);
	}
	if (listen(tcpsock, 5) < 0) {
		syslog(LOG_ERR, "listen failed");
		nfscbd_exit(1);
	}
	FD_SET(tcpsock, &sockbits);
	maxsock = tcpsock;
	connect_type_cnt++;

	setproctitle("master");

	/*
	 * Loop forever accepting connections and passing the sockets
	 * into the kernel for the mounts.
	 */
	for (;;) {
		ready = sockbits;
		if (connect_type_cnt > 1) {
			if (select(maxsock + 1,
			    &ready, NULL, NULL, NULL) < 1) {
				syslog(LOG_ERR, "select failed: %m");
				nfscbd_exit(1);
			}
		}
		if (FD_ISSET(tcpsock, &ready)) {
			len = sizeof(inetpeer);
			if ((msgsock = accept(tcpsock,
			    (struct sockaddr *)&inetpeer, &len)) < 0) {
				syslog(LOG_ERR, "accept failed: %m");
				nfscbd_exit(1);
			}
			memset(inetpeer.sin_zero, 0,
			    sizeof (inetpeer.sin_zero));
			if (setsockopt(msgsock, SOL_SOCKET,
			    SO_KEEPALIVE, (char *)&on, sizeof(on)) < 0)
				syslog(LOG_ERR,
				    "setsockopt SO_KEEPALIVE: %m");
			nfscbdargs.sock = msgsock;
			nfscbdargs.name = (caddr_t)&inetpeer;
			nfscbdargs.namelen = sizeof(inetpeer);
			nfssvc(NFSSVC_CBADDSOCK, &nfscbdargs);
			(void)close(msgsock);
		}
	}
}

static void
usage(void)
{

	errx(1, "usage: nfscbd %s", USAGE);
}

static void
nonfs(int signo __unused)
{
	syslog(LOG_ERR, "missing system call: NFS not available");
}

static void
reapchild(int signo __unused)
{
	pid_t pid;

	while ((pid = wait3(NULL, WNOHANG, NULL)) > 0) {
		if (pid == children)
			children = -1;
	}
}

static void
killchildren(void)
{

	if (children > 0)
		kill(children, SIGKILL);
}

/*
 * Cleanup master after SIGUSR1.
 */
static void
cleanup(int signo __unused)
{
	nfscbd_exit(0);
}

/*
 * Cleanup child after SIGUSR1.
 */
static void
child_cleanup(int signo __unused)
{
	exit(0);
}

static void
nfscbd_exit(int status __unused)
{
	killchildren();
	exit(status);
}