1 /*
2 * Copyright (c) 1989, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * @(#) Copyright (c) 1989, 1993, 1994 The Regents of the University of California. All rights reserved.
33 * @(#)nfsd.c 8.9 (Berkeley) 3/29/95
34 * $FreeBSD: src/usr.sbin/nfsd/nfsd.c,v 1.34 2005/12/21 10:12:05 delphij Exp $
35 */
36
37 #include <sys/param.h>
38 #include <sys/syslog.h>
39 #include <sys/wait.h>
40 #include <sys/mount.h>
41 #include <sys/linker.h>
42 #include <sys/module.h>
43
44 #include <rpc/rpc.h>
45 #include <rpc/pmap_clnt.h>
46
47 #include <netdb.h>
48 #include <arpa/inet.h>
49 #include <vfs/nfs/rpcv2.h>
50 #include <vfs/nfs/nfsproto.h>
51 #include <vfs/nfs/nfs.h>
52
53 #include <err.h>
54 #include <errno.h>
55 #include <signal.h>
56 #include <stdio.h>
57 #include <stdlib.h>
58 #include <string.h>
59 #include <unistd.h>
60
61 /* Global defs */
62 #ifdef DEBUG
63 #define syslog(e, s...) fprintf(stderr,s)
64 int debug = 1;
65 #else
66 int debug = 0;
67 #endif
68
69 struct nfsd_srvargs nsd;
70
71 #define MAXNFSDCNT 256
72 #define DEFNFSDCNT 4
73 pid_t children[MAXNFSDCNT]; /* PIDs of children */
74 int nfsdcnt; /* number of children */
75
76 void cleanup(int) __dead2;
77 void child_cleanup(int) __dead2;
78 void killchildren(void);
79 void nfsd_exit(int) __dead2;
80 void nonfs(int);
81 void reapchild(int);
82 int setbindhost(struct addrinfo **ia, const char *bindhost,
83 struct addrinfo hints);
84 void start_server(int) __dead2;
85 void unregistration(void);
86 void usage(void) __dead2;
87
88 /*
89 * Nfs server daemon mostly just a user context for nfssvc()
90 *
91 * 1 - do file descriptor and signal cleanup
92 * 2 - fork the nfsd(s)
93 * 3 - create server socket(s)
94 * 4 - register socket with rpcbind
95 *
96 * For connectionless protocols, just pass the socket into the kernel via.
97 * nfssvc().
98 * For connection based sockets, loop doing accepts. When you get a new
99 * socket from accept, pass the msgsock into the kernel via. nfssvc().
100 * The arguments are:
101 * -r - reregister with rpcbind
102 * -d - unregister with rpcbind
103 * -t - support tcp nfs clients
104 * -u - support udp nfs clients
105 * followed by "n" which is the number of nfsds' to fork off
106 */
107 int
main(int argc,char ** argv)108 main(int argc, char **argv)
109 {
110 struct nfsd_args nfsdargs;
111 struct addrinfo *ai_udp, *ai_tcp, *ai_udp6, *ai_tcp6, hints;
112 struct netconfig *nconf_udp, *nconf_tcp, *nconf_udp6, *nconf_tcp6;
113 struct netbuf nb_udp, nb_tcp, nb_udp6, nb_tcp6;
114 struct sockaddr_in inetpeer;
115 struct sockaddr_in6 inet6peer;
116 fd_set ready, sockbits;
117 fd_set v4bits, v6bits;
118 int ch, connect_type_cnt, i, maxsock, msgsock;
119 socklen_t len;
120 int on = 1, unregister, reregister, sock;
121 int tcp6sock, ip6flag, tcpflag, tcpsock;
122 int udpflag, ecode, s, srvcnt;
123 int bindhostc, bindanyflag, rpcbreg, rpcbregcnt;
124 char **bindhost = NULL;
125 pid_t pid;
126 struct vfsconf vfc;
127 int error;
128
129 error = getvfsbyname("nfs", &vfc);
130 if (error && vfsisloadable("nfs")) {
131 if (vfsload("nfs"))
132 err(1, "vfsload(nfs)");
133 endvfsent(); /* flush cache */
134 error = getvfsbyname("nfs", &vfc);
135 }
136 if (error)
137 errx(1, "NFS is not available in the running kernel");
138
139 nfsdcnt = DEFNFSDCNT;
140 unregister = reregister = tcpflag = maxsock = 0;
141 bindanyflag = udpflag = connect_type_cnt = bindhostc = 0;
142 #define GETOPT "ah:n:rdtu"
143 #define USAGE "[-ardtu] [-n num_servers] [-h bindip]"
144 while ((ch = getopt(argc, argv, GETOPT)) != -1)
145 switch (ch) {
146 case 'a':
147 bindanyflag = 1;
148 break;
149 case 'n':
150 nfsdcnt = atoi(optarg);
151 if (nfsdcnt < 1 || nfsdcnt > MAXNFSDCNT) {
152 warnx("nfsd count %d; reset to %d", nfsdcnt,
153 DEFNFSDCNT);
154 nfsdcnt = DEFNFSDCNT;
155 }
156 break;
157 case 'h':
158 bindhostc++;
159 bindhost = realloc(bindhost,sizeof(char *)*bindhostc);
160 if (bindhost == NULL)
161 errx(1, "Out of memory");
162 bindhost[bindhostc-1] = strdup(optarg);
163 if (bindhost[bindhostc-1] == NULL)
164 errx(1, "Out of memory");
165 break;
166 case 'r':
167 reregister = 1;
168 break;
169 case 'd':
170 unregister = 1;
171 break;
172 case 't':
173 tcpflag = 1;
174 break;
175 case 'u':
176 udpflag = 1;
177 break;
178 default:
179 case '?':
180 usage();
181 }
182 if (!tcpflag && !udpflag)
183 udpflag = 1;
184 argv += optind;
185 argc -= optind;
186
187 /*
188 * XXX
189 * Backward compatibility, trailing number is the count of daemons.
190 */
191 if (argc > 1)
192 usage();
193 if (argc == 1) {
194 nfsdcnt = atoi(argv[0]);
195 if (nfsdcnt < 1 || nfsdcnt > MAXNFSDCNT) {
196 warnx("nfsd count %d; reset to %d", nfsdcnt,
197 DEFNFSDCNT);
198 nfsdcnt = DEFNFSDCNT;
199 }
200 }
201
202 ip6flag = 1;
203 s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
204 if (s == -1) {
205 if (errno != EPROTONOSUPPORT)
206 err(1, "socket");
207 ip6flag = 0;
208 } else if (getnetconfigent("udp6") == NULL ||
209 getnetconfigent("tcp6") == NULL) {
210 ip6flag = 0;
211 }
212 if (s != -1)
213 close(s);
214
215 if (bindhostc == 0 || bindanyflag) {
216 bindhostc++;
217 bindhost = realloc(bindhost,sizeof(char *)*bindhostc);
218 if (bindhost == NULL)
219 errx(1, "Out of memory");
220 bindhost[bindhostc-1] = strdup("*");
221 if (bindhost[bindhostc-1] == NULL)
222 errx(1, "Out of memory");
223 }
224
225 if (unregister) {
226 unregistration();
227 exit (0);
228 }
229 if (debug == 0) {
230 daemon(0, 0);
231 signal(SIGHUP, SIG_IGN);
232 signal(SIGINT, SIG_IGN);
233 /*
234 * nfsd sits in the kernel most of the time. It needs
235 * to ignore SIGTERM/SIGQUIT in order to stay alive as long
236 * as possible during a shutdown, otherwise loopback
237 * mounts will not be able to unmount.
238 */
239 signal(SIGTERM, SIG_IGN);
240 signal(SIGQUIT, SIG_IGN);
241 }
242 if (reregister) {
243 if (udpflag) {
244 memset(&hints, 0, sizeof hints);
245 hints.ai_flags = AI_PASSIVE;
246 hints.ai_family = AF_INET;
247 hints.ai_socktype = SOCK_DGRAM;
248 hints.ai_protocol = IPPROTO_UDP;
249 ecode = getaddrinfo(NULL, "nfs", &hints, &ai_udp);
250 if (ecode != 0)
251 err(1, "getaddrinfo udp: %s", gai_strerror(ecode));
252 nconf_udp = getnetconfigent("udp");
253 if (nconf_udp == NULL)
254 err(1, "getnetconfigent udp failed");
255 nb_udp.buf = ai_udp->ai_addr;
256 nb_udp.len = nb_udp.maxlen = ai_udp->ai_addrlen;
257 if ((!rpcb_set(RPCPROG_NFS, 2, nconf_udp, &nb_udp)) ||
258 (!rpcb_set(RPCPROG_NFS, 3, nconf_udp, &nb_udp)))
259 err(1, "rpcb_set udp failed");
260 freeaddrinfo(ai_udp);
261 }
262 if (udpflag && ip6flag) {
263 memset(&hints, 0, sizeof hints);
264 hints.ai_flags = AI_PASSIVE;
265 hints.ai_family = AF_INET6;
266 hints.ai_socktype = SOCK_DGRAM;
267 hints.ai_protocol = IPPROTO_UDP;
268 ecode = getaddrinfo(NULL, "nfs", &hints, &ai_udp6);
269 if (ecode != 0)
270 err(1, "getaddrinfo udp6: %s", gai_strerror(ecode));
271 nconf_udp6 = getnetconfigent("udp6");
272 if (nconf_udp6 == NULL)
273 err(1, "getnetconfigent udp6 failed");
274 nb_udp6.buf = ai_udp6->ai_addr;
275 nb_udp6.len = nb_udp6.maxlen = ai_udp6->ai_addrlen;
276 if ((!rpcb_set(RPCPROG_NFS, 2, nconf_udp6, &nb_udp6)) ||
277 (!rpcb_set(RPCPROG_NFS, 3, nconf_udp6, &nb_udp6)))
278 err(1, "rpcb_set udp6 failed");
279 freeaddrinfo(ai_udp6);
280 }
281 if (tcpflag) {
282 memset(&hints, 0, sizeof hints);
283 hints.ai_flags = AI_PASSIVE;
284 hints.ai_family = AF_INET;
285 hints.ai_socktype = SOCK_STREAM;
286 hints.ai_protocol = IPPROTO_TCP;
287 ecode = getaddrinfo(NULL, "nfs", &hints, &ai_tcp);
288 if (ecode != 0)
289 err(1, "getaddrinfo tcp: %s", gai_strerror(ecode));
290 nconf_tcp = getnetconfigent("tcp");
291 if (nconf_tcp == NULL)
292 err(1, "getnetconfigent tcp failed");
293 nb_tcp.buf = ai_tcp->ai_addr;
294 nb_tcp.len = nb_tcp.maxlen = ai_tcp->ai_addrlen;
295 if ((!rpcb_set(RPCPROG_NFS, 2, nconf_tcp, &nb_tcp)) ||
296 (!rpcb_set(RPCPROG_NFS, 3, nconf_tcp, &nb_tcp)))
297 err(1, "rpcb_set tcp failed");
298 freeaddrinfo(ai_tcp);
299 }
300 if (tcpflag && ip6flag) {
301 memset(&hints, 0, sizeof hints);
302 hints.ai_flags = AI_PASSIVE;
303 hints.ai_family = AF_INET6;
304 hints.ai_socktype = SOCK_STREAM;
305 hints.ai_protocol = IPPROTO_TCP;
306 ecode = getaddrinfo(NULL, "nfs", &hints, &ai_tcp6);
307 if (ecode != 0)
308 err(1, "getaddrinfo tcp6: %s", gai_strerror(ecode));
309 nconf_tcp6 = getnetconfigent("tcp6");
310 if (nconf_tcp6 == NULL)
311 err(1, "getnetconfigent tcp6 failed");
312 nb_tcp6.buf = ai_tcp6->ai_addr;
313 nb_tcp6.len = nb_tcp6.maxlen = ai_tcp6->ai_addrlen;
314 if ((!rpcb_set(RPCPROG_NFS, 2, nconf_tcp6, &nb_tcp6)) ||
315 (!rpcb_set(RPCPROG_NFS, 3, nconf_tcp6, &nb_tcp6)))
316 err(1, "rpcb_set tcp6 failed");
317 freeaddrinfo(ai_tcp6);
318 }
319 exit (0);
320 }
321 signal(SIGSYS, nonfs);
322 signal(SIGCHLD, reapchild);
323
324 openlog("nfsd", LOG_PID, LOG_DAEMON);
325
326 /* If we use UDP only, we start the last server below. */
327 srvcnt = tcpflag ? nfsdcnt : nfsdcnt - 1;
328 for (i = 0; i < srvcnt; i++) {
329 switch ((pid = fork())) {
330 case -1:
331 syslog(LOG_ERR, "fork: %m");
332 nfsd_exit(1);
333 case 0:
334 break;
335 default:
336 children[i] = pid;
337 continue;
338 }
339 signal(SIGUSR1, child_cleanup);
340 setproctitle("server");
341
342 start_server(0);
343 }
344
345 signal(SIGUSR1, cleanup);
346 FD_ZERO(&v4bits);
347 FD_ZERO(&v6bits);
348 FD_ZERO(&sockbits);
349
350 rpcbregcnt = 0;
351 /* Set up the socket for udp and rpcb register it. */
352 if (udpflag) {
353 rpcbreg = 0;
354 for (i = 0; i < bindhostc; i++) {
355 memset(&hints, 0, sizeof hints);
356 hints.ai_flags = AI_PASSIVE;
357 hints.ai_family = AF_INET;
358 hints.ai_socktype = SOCK_DGRAM;
359 hints.ai_protocol = IPPROTO_UDP;
360 if (setbindhost(&ai_udp, bindhost[i], hints) == 0) {
361 rpcbreg = 1;
362 rpcbregcnt++;
363 if ((sock = socket(ai_udp->ai_family,
364 ai_udp->ai_socktype,
365 ai_udp->ai_protocol)) < 0) {
366 syslog(LOG_ERR,
367 "can't create udp socket");
368 nfsd_exit(1);
369 }
370 if (bind(sock, ai_udp->ai_addr,
371 ai_udp->ai_addrlen) < 0) {
372 syslog(LOG_ERR,
373 "can't bind udp addr %s: %m",
374 bindhost[i]);
375 nfsd_exit(1);
376 }
377 freeaddrinfo(ai_udp);
378 nfsdargs.sock = sock;
379 nfsdargs.name = NULL;
380 nfsdargs.namelen = 0;
381 if (nfssvc(NFSSVC_ADDSOCK, &nfsdargs) < 0) {
382 syslog(LOG_ERR, "can't Add UDP socket");
383 nfsd_exit(1);
384 }
385 close(sock);
386 }
387 }
388 if (rpcbreg == 1) {
389 memset(&hints, 0, sizeof hints);
390 hints.ai_flags = AI_PASSIVE;
391 hints.ai_family = AF_INET;
392 hints.ai_socktype = SOCK_DGRAM;
393 hints.ai_protocol = IPPROTO_UDP;
394 ecode = getaddrinfo(NULL, "nfs", &hints, &ai_udp);
395 if (ecode != 0) {
396 syslog(LOG_ERR, "getaddrinfo udp: %s",
397 gai_strerror(ecode));
398 nfsd_exit(1);
399 }
400 nconf_udp = getnetconfigent("udp");
401 if (nconf_udp == NULL)
402 err(1, "getnetconfigent udp failed");
403 nb_udp.buf = ai_udp->ai_addr;
404 nb_udp.len = nb_udp.maxlen = ai_udp->ai_addrlen;
405 if ((!rpcb_set(RPCPROG_NFS, 2, nconf_udp, &nb_udp)) ||
406 (!rpcb_set(RPCPROG_NFS, 3, nconf_udp, &nb_udp)))
407 err(1, "rpcb_set udp failed");
408 freeaddrinfo(ai_udp);
409 }
410 }
411
412 /* Set up the socket for udp6 and rpcb register it. */
413 if (udpflag && ip6flag) {
414 rpcbreg = 0;
415 for (i = 0; i < bindhostc; i++) {
416 memset(&hints, 0, sizeof hints);
417 hints.ai_flags = AI_PASSIVE;
418 hints.ai_family = AF_INET6;
419 hints.ai_socktype = SOCK_DGRAM;
420 hints.ai_protocol = IPPROTO_UDP;
421 if (setbindhost(&ai_udp6, bindhost[i], hints) == 0) {
422 rpcbreg = 1;
423 rpcbregcnt++;
424 if ((sock = socket(ai_udp6->ai_family,
425 ai_udp6->ai_socktype,
426 ai_udp6->ai_protocol)) < 0) {
427 syslog(LOG_ERR,
428 "can't create udp6 socket");
429 nfsd_exit(1);
430 }
431 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY,
432 &on, sizeof on) < 0) {
433 syslog(LOG_ERR,
434 "can't set v6-only binding for "
435 "udp6 socket: %m");
436 nfsd_exit(1);
437 }
438 if (bind(sock, ai_udp6->ai_addr,
439 ai_udp6->ai_addrlen) < 0) {
440 syslog(LOG_ERR,
441 "can't bind udp6 addr %s: %m",
442 bindhost[i]);
443 nfsd_exit(1);
444 }
445 freeaddrinfo(ai_udp6);
446 nfsdargs.sock = sock;
447 nfsdargs.name = NULL;
448 nfsdargs.namelen = 0;
449 if (nfssvc(NFSSVC_ADDSOCK, &nfsdargs) < 0) {
450 syslog(LOG_ERR,
451 "can't add UDP6 socket");
452 nfsd_exit(1);
453 }
454 close(sock);
455 }
456 }
457 if (rpcbreg == 1) {
458 memset(&hints, 0, sizeof hints);
459 hints.ai_flags = AI_PASSIVE;
460 hints.ai_family = AF_INET6;
461 hints.ai_socktype = SOCK_DGRAM;
462 hints.ai_protocol = IPPROTO_UDP;
463 ecode = getaddrinfo(NULL, "nfs", &hints, &ai_udp6);
464 if (ecode != 0) {
465 syslog(LOG_ERR, "getaddrinfo udp6: %s",
466 gai_strerror(ecode));
467 nfsd_exit(1);
468 }
469 nconf_udp6 = getnetconfigent("udp6");
470 if (nconf_udp6 == NULL)
471 err(1, "getnetconfigent udp6 failed");
472 nb_udp6.buf = ai_udp6->ai_addr;
473 nb_udp6.len = nb_udp6.maxlen = ai_udp6->ai_addrlen;
474 if ((!rpcb_set(RPCPROG_NFS, 2, nconf_udp6, &nb_udp6)) ||
475 (!rpcb_set(RPCPROG_NFS, 3, nconf_udp6, &nb_udp6)))
476 err(1, "rpcb_set udp6 failed");
477 freeaddrinfo(ai_udp6);
478 }
479 }
480
481 /* Set up the socket for tcp and rpcb register it. */
482 if (tcpflag) {
483 rpcbreg = 0;
484 for (i = 0; i < bindhostc; i++) {
485 memset(&hints, 0, sizeof hints);
486 hints.ai_flags = AI_PASSIVE;
487 hints.ai_family = AF_INET;
488 hints.ai_socktype = SOCK_STREAM;
489 hints.ai_protocol = IPPROTO_TCP;
490 if (setbindhost(&ai_tcp, bindhost[i], hints) == 0) {
491 rpcbreg = 1;
492 rpcbregcnt++;
493 if ((tcpsock = socket(AF_INET, SOCK_STREAM,
494 0)) < 0) {
495 syslog(LOG_ERR,
496 "can't create tpc socket");
497 nfsd_exit(1);
498 }
499 if (setsockopt(tcpsock, SOL_SOCKET,
500 SO_REUSEADDR,
501 (char *)&on, sizeof(on)) < 0)
502 syslog(LOG_ERR,
503 "setsockopt SO_REUSEADDR: %m");
504 if (bind(tcpsock, ai_tcp->ai_addr,
505 ai_tcp->ai_addrlen) < 0) {
506 syslog(LOG_ERR,
507 "can't bind tcp addr %s: %m",
508 bindhost[i]);
509 nfsd_exit(1);
510 }
511 if (listen(tcpsock, 64) < 0) {
512 syslog(LOG_ERR, "listen failed");
513 nfsd_exit(1);
514 }
515 freeaddrinfo(ai_tcp);
516 FD_SET(tcpsock, &sockbits);
517 FD_SET(tcpsock, &v4bits);
518 maxsock = tcpsock;
519 connect_type_cnt++;
520 }
521 }
522 if (rpcbreg == 1) {
523 memset(&hints, 0, sizeof hints);
524 hints.ai_flags = AI_PASSIVE;
525 hints.ai_family = AF_INET;
526 hints.ai_socktype = SOCK_STREAM;
527 hints.ai_protocol = IPPROTO_TCP;
528 ecode = getaddrinfo(NULL, "nfs", &hints,
529 &ai_tcp);
530 if (ecode != 0) {
531 syslog(LOG_ERR, "getaddrinfo tcp: %s",
532 gai_strerror(ecode));
533 nfsd_exit(1);
534 }
535 nconf_tcp = getnetconfigent("tcp");
536 if (nconf_tcp == NULL)
537 err(1, "getnetconfigent tcp failed");
538 nb_tcp.buf = ai_tcp->ai_addr;
539 nb_tcp.len = nb_tcp.maxlen = ai_tcp->ai_addrlen;
540 if ((!rpcb_set(RPCPROG_NFS, 2, nconf_tcp,
541 &nb_tcp)) || (!rpcb_set(RPCPROG_NFS, 3,
542 nconf_tcp, &nb_tcp)))
543 err(1, "rpcb_set tcp failed");
544 freeaddrinfo(ai_tcp);
545 }
546 }
547
548 /* Set up the socket for tcp6 and rpcb register it. */
549 if (tcpflag && ip6flag) {
550 rpcbreg = 0;
551 for (i = 0; i < bindhostc; i++) {
552 memset(&hints, 0, sizeof hints);
553 hints.ai_flags = AI_PASSIVE;
554 hints.ai_family = AF_INET6;
555 hints.ai_socktype = SOCK_STREAM;
556 hints.ai_protocol = IPPROTO_TCP;
557 if (setbindhost(&ai_tcp6, bindhost[i], hints) == 0) {
558 rpcbreg = 1;
559 rpcbregcnt++;
560 if ((tcp6sock = socket(ai_tcp6->ai_family,
561 ai_tcp6->ai_socktype,
562 ai_tcp6->ai_protocol)) < 0) {
563 syslog(LOG_ERR,
564 "can't create tcp6 socket");
565 nfsd_exit(1);
566 }
567 if (setsockopt(tcp6sock, SOL_SOCKET,
568 SO_REUSEADDR,
569 (char *)&on, sizeof(on)) < 0)
570 syslog(LOG_ERR,
571 "setsockopt SO_REUSEADDR: %m");
572 if (setsockopt(tcp6sock, IPPROTO_IPV6,
573 IPV6_V6ONLY, &on, sizeof on) < 0) {
574 syslog(LOG_ERR,
575 "can't set v6-only binding for tcp6 "
576 "socket: %m");
577 nfsd_exit(1);
578 }
579 if (bind(tcp6sock, ai_tcp6->ai_addr,
580 ai_tcp6->ai_addrlen) < 0) {
581 syslog(LOG_ERR,
582 "can't bind tcp6 addr %s: %m",
583 bindhost[i]);
584 nfsd_exit(1);
585 }
586 if (listen(tcp6sock, 64) < 0) {
587 syslog(LOG_ERR, "listen failed");
588 nfsd_exit(1);
589 }
590 freeaddrinfo(ai_tcp6);
591 FD_SET(tcp6sock, &sockbits);
592 FD_SET(tcp6sock, &v6bits);
593 if (maxsock < tcp6sock)
594 maxsock = tcp6sock;
595 connect_type_cnt++;
596 }
597 }
598 if (rpcbreg == 1) {
599 memset(&hints, 0, sizeof hints);
600 hints.ai_flags = AI_PASSIVE;
601 hints.ai_family = AF_INET6;
602 hints.ai_socktype = SOCK_STREAM;
603 hints.ai_protocol = IPPROTO_TCP;
604 ecode = getaddrinfo(NULL, "nfs", &hints, &ai_tcp6);
605 if (ecode != 0) {
606 syslog(LOG_ERR, "getaddrinfo tcp6: %s",
607 gai_strerror(ecode));
608 nfsd_exit(1);
609 }
610 nconf_tcp6 = getnetconfigent("tcp6");
611 if (nconf_tcp6 == NULL)
612 err(1, "getnetconfigent tcp6 failed");
613 nb_tcp6.buf = ai_tcp6->ai_addr;
614 nb_tcp6.len = nb_tcp6.maxlen = ai_tcp6->ai_addrlen;
615 if ((!rpcb_set(RPCPROG_NFS, 2, nconf_tcp6, &nb_tcp6)) ||
616 (!rpcb_set(RPCPROG_NFS, 3, nconf_tcp6, &nb_tcp6)))
617 err(1, "rpcb_set tcp6 failed");
618 freeaddrinfo(ai_tcp6);
619 }
620 }
621
622 if (rpcbregcnt == 0) {
623 syslog(LOG_ERR, "rpcb_set() failed, nothing to do: %m");
624 nfsd_exit(1);
625 }
626
627 if (tcpflag && connect_type_cnt == 0) {
628 syslog(LOG_ERR, "tcp connects == 0, nothing to do: %m");
629 nfsd_exit(1);
630 }
631
632 setproctitle("master");
633 /*
634 * We always want a master to have a clean way to to shut nfsd down
635 * (with unregistration): if the master is killed, it unregisters and
636 * kills all children. If we run for UDP only (and so do not have to
637 * loop waiting waiting for accept), we instead make the parent
638 * a "server" too. start_server will not return.
639 */
640 if (!tcpflag)
641 start_server(1);
642
643 /*
644 * Loop forever accepting connections and passing the sockets
645 * into the kernel for the mounts.
646 */
647 for (;;) {
648 ready = sockbits;
649 if (connect_type_cnt > 1) {
650 if (select(maxsock + 1,
651 &ready, NULL, NULL, NULL) < 1) {
652 syslog(LOG_ERR, "select failed: %m");
653 if (errno == EINTR)
654 continue;
655 nfsd_exit(1);
656 }
657 }
658 for (tcpsock = 0; tcpsock <= maxsock; tcpsock++) {
659 if (FD_ISSET(tcpsock, &ready)) {
660 if (FD_ISSET(tcpsock, &v4bits)) {
661 len = sizeof(inetpeer);
662 if ((msgsock = accept(tcpsock,
663 (struct sockaddr *)&inetpeer, &len)) < 0) {
664 syslog(LOG_ERR, "accept failed: %m");
665 if (errno == ECONNABORTED ||
666 errno == EINTR)
667 continue;
668 nfsd_exit(1);
669 }
670 memset(inetpeer.sin_zero, 0,
671 sizeof(inetpeer.sin_zero));
672 if (setsockopt(msgsock, SOL_SOCKET,
673 SO_KEEPALIVE, (char *)&on, sizeof(on)) < 0)
674 syslog(LOG_ERR,
675 "setsockopt SO_KEEPALIVE: %m");
676 nfsdargs.sock = msgsock;
677 nfsdargs.name = (caddr_t)&inetpeer;
678 nfsdargs.namelen = len;
679 nfssvc(NFSSVC_ADDSOCK, &nfsdargs);
680 close(msgsock);
681 } else if (FD_ISSET(tcpsock, &v6bits)) {
682 len = sizeof(inet6peer);
683 if ((msgsock = accept(tcpsock,
684 (struct sockaddr *)&inet6peer,
685 &len)) < 0) {
686 syslog(LOG_ERR,
687 "accept failed: %m");
688 if (errno == ECONNABORTED ||
689 errno == EINTR)
690 continue;
691 nfsd_exit(1);
692 }
693 if (setsockopt(msgsock, SOL_SOCKET,
694 SO_KEEPALIVE, (char *)&on,
695 sizeof(on)) < 0)
696 syslog(LOG_ERR, "setsockopt "
697 "SO_KEEPALIVE: %m");
698 nfsdargs.sock = msgsock;
699 nfsdargs.name = (caddr_t)&inet6peer;
700 nfsdargs.namelen = len;
701 nfssvc(NFSSVC_ADDSOCK, &nfsdargs);
702 close(msgsock);
703 }
704 }
705 }
706 }
707 }
708
709 int
setbindhost(struct addrinfo ** ai,const char * bindhost,struct addrinfo hints)710 setbindhost(struct addrinfo **ai, const char *bindhost, struct addrinfo hints)
711 {
712 int ecode;
713 u_int32_t host_addr[4]; /* IPv4 or IPv6 */
714 const char *hostptr;
715
716 if (bindhost == NULL || strcmp("*", bindhost) == 0)
717 hostptr = NULL;
718 else
719 hostptr = bindhost;
720
721 if (hostptr != NULL) {
722 switch (hints.ai_family) {
723 case AF_INET:
724 if (inet_pton(AF_INET, hostptr, host_addr) == 1) {
725 hints.ai_flags = AI_NUMERICHOST;
726 } else {
727 if (inet_pton(AF_INET6, hostptr,
728 host_addr) == 1)
729 return (1);
730 }
731 break;
732 case AF_INET6:
733 if (inet_pton(AF_INET6, hostptr, host_addr) == 1) {
734 hints.ai_flags = AI_NUMERICHOST;
735 } else {
736 if (inet_pton(AF_INET, hostptr,
737 host_addr) == 1)
738 return (1);
739 }
740 break;
741 default:
742 break;
743 }
744 }
745
746 ecode = getaddrinfo(hostptr, "nfs", &hints, ai);
747 if (ecode != 0) {
748 syslog(LOG_ERR, "getaddrinfo %s: %s", bindhost,
749 gai_strerror(ecode));
750 return (1);
751 }
752 return (0);
753 }
754
755 void
usage(void)756 usage(void)
757 {
758 fprintf(stderr, "usage: nfsd %s\n", USAGE);
759 exit(1);
760 }
761
762 void
nonfs(int signo __unused)763 nonfs(int signo __unused)
764 {
765 syslog(LOG_ERR, "missing system call: NFS not available");
766 }
767
768 void
reapchild(int signo __unused)769 reapchild(int signo __unused)
770 {
771 pid_t pid;
772 int i;
773
774 while ((pid = wait3(NULL, WNOHANG, NULL)) > 0) {
775 for (i = 0; i < nfsdcnt; i++)
776 if (pid == children[i])
777 children[i] = -1;
778 }
779 }
780
781 void
unregistration(void)782 unregistration(void)
783 {
784 if ((!rpcb_unset(RPCPROG_NFS, 2, NULL)) ||
785 (!rpcb_unset(RPCPROG_NFS, 3, NULL)))
786 syslog(LOG_ERR, "rpcb_unset failed");
787 }
788
789 void
killchildren(void)790 killchildren(void)
791 {
792 int i;
793
794 for (i = 0; i < nfsdcnt; i++) {
795 if (children[i] > 0)
796 kill(children[i], SIGKILL);
797 }
798 }
799
800 /*
801 * Cleanup master after SIGUSR1.
802 */
803 void
cleanup(__unused int signo)804 cleanup(__unused int signo)
805 {
806 nfsd_exit(0);
807 }
808
809 /*
810 * Cleanup child after SIGUSR1.
811 */
812 void
child_cleanup(__unused int signo)813 child_cleanup(__unused int signo)
814 {
815 exit(0);
816 }
817
818 void
nfsd_exit(int status)819 nfsd_exit(int status)
820 {
821 killchildren();
822 unregistration();
823 exit(status);
824 }
825
826 void
start_server(int master)827 start_server(int master)
828 {
829 int status;
830
831 status = 0;
832 nsd.nsd_nfsd = NULL;
833 if (nfssvc(NFSSVC_NFSD, &nsd) < 0) {
834 syslog(LOG_ERR, "nfssvc: %m");
835 status = 1;
836 }
837 if (master)
838 nfsd_exit(status);
839 else
840 exit(status);
841 }
842