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Date:: Fri Nov 17 09:22:37 2023 UTC
Message:: remove the gotwebd repository cache It only had 4 slots so was never quite useful, and sharing of sock->pack_fds across cached repositories seems problematic. with help from + ok op@
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1 /*
2  * Copyright (c) 2016, 2019, 2020-2021 Tracey Emery <tracey@traceyemery.net>
3  * Copyright (c) 2015 Mike Larkin <mlarkin@openbsd.org>
4  * Copyright (c) 2013 David Gwynne <dlg@openbsd.org>
5  * Copyright (c) 2013 Florian Obser <florian@openbsd.org>
6  *
7  * Permission to use, copy, modify, and distribute this software for any
8  * purpose with or without fee is hereby granted, provided that the above
9  * copyright notice and this permission notice appear in all copies.
10  *
11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18  */
19 
20 #include <sys/param.h>
21 #include <sys/ioctl.h>
22 #include <sys/queue.h>
23 #include <sys/wait.h>
24 #include <sys/uio.h>
25 #include <sys/resource.h>
26 #include <sys/socket.h>
27 #include <sys/stat.h>
28 #include <sys/time.h>
29 #include <sys/types.h>
30 #include <sys/mman.h>
31 #include <sys/un.h>
32 
33 #include <net/if.h>
34 #include <netinet/in.h>
35 
36 #include <errno.h>
37 #include <event.h>
38 #include <fcntl.h>
39 #include <ifaddrs.h>
40 #include <imsg.h>
41 #include <limits.h>
42 #include <netdb.h>
43 #include <poll.h>
44 #include <pwd.h>
45 #include <stddef.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49 #include <unistd.h>
50 #include <util.h>
51 
52 #include "got_error.h"
53 #include "got_opentemp.h"
54 #include "got_reference.h"
55 #include "got_repository.h"
56 #include "got_privsep.h"
57 
58 #include "gotwebd.h"
59 #include "tmpl.h"
60 
61 #define SOCKS_BACKLOG 5
62 #define MAXIMUM(a, b)	(((a) > (b)) ? (a) : (b))
63 
64 volatile int client_cnt;
65 
66 static struct timeval	timeout = { TIMEOUT_DEFAULT, 0 };
67 
68 static void	 sockets_sighdlr(int, short, void *);
69 static void	 sockets_shutdown(void);
70 static void	 sockets_launch(void);
71 static void	 sockets_purge(struct gotwebd *);
72 static void	 sockets_accept_paused(int, short, void *);
73 static void	 sockets_rlimit(int);
74 
75 static void	 sockets_dispatch_main(int, short, void *);
76 static int	 sockets_unix_socket_listen(struct gotwebd *, struct socket *);
77 static int	 sockets_create_socket(struct address *);
78 static int	 sockets_accept_reserve(int, struct sockaddr *, socklen_t *,
79 		    int, volatile int *);
80 
81 static struct socket *sockets_conf_new_socket_unix(struct gotwebd *,
82 		    struct server *, int);
83 static struct socket *sockets_conf_new_socket_fcgi(struct gotwebd *,
84 		    struct server *, int, struct address *);
85 
86 int cgi_inflight = 0;
87 
88 void
89 sockets(struct gotwebd *env, int fd)
90 {
91 	struct event	 sighup, sigpipe, sigusr1, sigchld;
92 
93 	event_init();
94 
95 	sockets_rlimit(-1);
96 
97 	if (config_init(env) == -1)
98 		fatal("failed to initialize configuration");
99 
100 	if ((env->iev_parent = malloc(sizeof(*env->iev_parent))) == NULL)
101 		fatal("malloc");
102 	imsg_init(&env->iev_parent->ibuf, fd);
103 	env->iev_parent->handler = sockets_dispatch_main;
104 	env->iev_parent->data = env->iev_parent;
105 	event_set(&env->iev_parent->ev, fd, EV_READ, sockets_dispatch_main,
106 	    env->iev_parent);
107 	event_add(&env->iev_parent->ev, NULL);
108 
109 	signal(SIGPIPE, SIG_IGN);
110 
111 	signal_set(&sighup, SIGCHLD, sockets_sighdlr, env);
112 	signal_add(&sighup, NULL);
113 	signal_set(&sigpipe, SIGCHLD, sockets_sighdlr, env);
114 	signal_add(&sigpipe, NULL);
115 	signal_set(&sigusr1, SIGCHLD, sockets_sighdlr, env);
116 	signal_add(&sigusr1, NULL);
117 	signal_set(&sigchld, SIGCHLD, sockets_sighdlr, env);
118 	signal_add(&sigchld, NULL);
119 
120 #ifndef PROFILE
121 	if (pledge("stdio rpath inet recvfd proc exec sendfd unveil",
122 	    NULL) == -1)
123 		fatal("pledge");
124 #endif
125 
126 	event_dispatch();
127 	sockets_shutdown();
128 }
129 
130 void
131 sockets_parse_sockets(struct gotwebd *env)
132 {
133 	struct server *srv;
134 	struct address *a;
135 	struct socket *new_sock = NULL;
136 	int sock_id = 1;
137 
138 	TAILQ_FOREACH(srv, &env->servers, entry) {
139 		if (srv->unix_socket) {
140 			new_sock = sockets_conf_new_socket_unix(env, srv,
141 			    sock_id);
142 			if (new_sock) {
143 				sock_id++;
144 				TAILQ_INSERT_TAIL(&env->sockets, new_sock,
145 				    entry);
146 			}
147 		}
148 
149 		if (srv->fcgi_socket) {
150 			if (TAILQ_EMPTY(&srv->al)) {
151 				fatalx("%s: server %s has no IP addresses to "
152 				    "listen for FCGI connections", __func__,
153 				    srv->name);
154 			}
155 			TAILQ_FOREACH(a, &srv->al, entry) {
156 				if (a->ss.ss_family != AF_INET &&
157 				    a->ss.ss_family != AF_INET6)
158 					continue;
159 				new_sock = sockets_conf_new_socket_fcgi(env,
160 				    srv, sock_id, a);
161 				if (new_sock) {
162 					sock_id++;
163 					TAILQ_INSERT_TAIL(&env->sockets,
164 					    new_sock, entry);
165 				}
166 			}
167 		}
168 	}
169 }
170 
171 static struct socket *
172 sockets_conf_new_socket_unix(struct gotwebd *env, struct server *srv, int id)
173 {
174 	struct socket *sock;
175 	int n;
176 
177 	if ((sock = calloc(1, sizeof(*sock))) == NULL)
178 		fatalx("%s: calloc", __func__);
179 
180 	sock->conf.id = id;
181 	sock->fd = -1;
182 	sock->conf.af_type = AF_UNIX;
183 
184 	if (strlcpy(sock->conf.unix_socket_name,
185 	    srv->unix_socket_name,
186 	    sizeof(sock->conf.unix_socket_name)) >=
187 	    sizeof(sock->conf.unix_socket_name)) {
188 		free(sock);
189 		fatalx("%s: strlcpy", __func__);
190 	}
191 
192 	n = snprintf(sock->conf.name, GOTWEBD_MAXTEXT, "%s_parent",
193 	    srv->name);
194 	if (n < 0 || (size_t)n >= GOTWEBD_MAXTEXT) {
195 		free(sock);
196 		fatalx("%s: snprintf", __func__);
197 	}
198 
199 	if (strlcpy(sock->conf.srv_name, srv->name,
200 	    sizeof(sock->conf.srv_name)) >= sizeof(sock->conf.srv_name)) {
201 		free(sock);
202 		fatalx("%s: strlcpy", __func__);
203 	}
204 
205 	return sock;
206 }
207 
208 static struct socket *
209 sockets_conf_new_socket_fcgi(struct gotwebd *env, struct server *srv, int id,
210     struct address *a)
211 {
212 	struct socket *sock;
213 	struct address *acp;
214 	int n;
215 
216 	if ((sock = calloc(1, sizeof(*sock))) == NULL)
217 		fatalx("%s: calloc", __func__);
218 
219 	sock->conf.id = id;
220 	sock->fd = -1;
221 	sock->conf.af_type = a->ss.ss_family;
222 
223 	sock->conf.fcgi_socket_port = a->port;
224 
225 	n = snprintf(sock->conf.name, GOTWEBD_MAXTEXT, "%s_parent",
226 	    srv->name);
227 	if (n < 0 || (size_t)n >= GOTWEBD_MAXTEXT) {
228 		free(sock);
229 		fatalx("%s: snprintf", __func__);
230 	}
231 
232 	if (strlcpy(sock->conf.srv_name, srv->name,
233 	    sizeof(sock->conf.srv_name)) >= sizeof(sock->conf.srv_name)) {
234 		free(sock);
235 		fatalx("%s: strlcpy", __func__);
236 	}
237 
238 	acp = &sock->conf.addr;
239 
240 	memcpy(&acp->ss, &a->ss, sizeof(acp->ss));
241 	acp->slen = a->slen;
242 	acp->ai_family = a->ai_family;
243 	acp->ai_socktype = a->ai_socktype;
244 	acp->ai_protocol = a->ai_protocol;
245 	acp->port = a->port;
246 	if (*a->ifname != '\0') {
247 		if (strlcpy(acp->ifname, a->ifname,
248 		    sizeof(acp->ifname)) >= sizeof(acp->ifname)) {
249 			fatalx("%s: interface name truncated",
250 			    __func__);
251 		}
252 	}
253 
254 	return (sock);
255 }
256 
257 static void
258 sockets_launch(void)
259 {
260 	struct socket *sock;
261 	struct server *srv;
262 	const struct got_error *error;
263 
264 	TAILQ_FOREACH(sock, &gotwebd_env->sockets, entry) {
265 		log_debug("%s: configuring socket %d (%d)", __func__,
266 		    sock->conf.id, sock->fd);
267 
268 		event_set(&sock->ev, sock->fd, EV_READ | EV_PERSIST,
269 		    sockets_socket_accept, sock);
270 
271 		if (event_add(&sock->ev, NULL))
272 			fatalx("event add sock");
273 
274 		evtimer_set(&sock->pause, sockets_accept_paused, sock);
275 
276 		log_debug("%s: running socket listener %d", __func__,
277 		    sock->conf.id);
278 	}
279 
280 	TAILQ_FOREACH(srv, &gotwebd_env->servers, entry) {
281 		if (unveil(srv->repos_path, "r") == -1)
282 			fatal("unveil %s", srv->repos_path);
283 	}
284 
285 	error = got_privsep_unveil_exec_helpers();
286 	if (error)
287 		fatal("%s", error->msg);
288 
289 	if (unveil(NULL, NULL) == -1)
290 		fatal("unveil");
291 }
292 
293 static void
294 sockets_purge(struct gotwebd *env)
295 {
296 	struct socket *sock, *tsock;
297 
298 	/* shutdown and remove sockets */
299 	TAILQ_FOREACH_SAFE(sock, &env->sockets, entry, tsock) {
300 		if (event_initialized(&sock->ev))
301 			event_del(&sock->ev);
302 		if (evtimer_initialized(&sock->evt))
303 			evtimer_del(&sock->evt);
304 		if (evtimer_initialized(&sock->pause))
305 			evtimer_del(&sock->pause);
306 		if (sock->fd != -1)
307 			close(sock->fd);
308 		TAILQ_REMOVE(&env->sockets, sock, entry);
309 	}
310 }
311 
312 static void
313 sockets_dispatch_main(int fd, short event, void *arg)
314 {
315 	struct imsgev		*iev = arg;
316 	struct imsgbuf		*ibuf;
317 	struct imsg		 imsg;
318 	struct gotwebd		*env = gotwebd_env;
319 	ssize_t			 n;
320 	int			 shut = 0;
321 
322 	ibuf = &iev->ibuf;
323 
324 	if (event & EV_READ) {
325 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
326 			fatal("imsg_read error");
327 		if (n == 0)	/* Connection closed */
328 			shut = 1;
329 	}
330 	if (event & EV_WRITE) {
331 		if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN)
332 			fatal("msgbuf_write");
333 		if (n == 0)	/* Connection closed */
334 			shut = 1;
335 	}
336 
337 	for (;;) {
338 		if ((n = imsg_get(ibuf, &imsg)) == -1)
339 			fatal("imsg_get");
340 		if (n == 0)	/* No more messages. */
341 			break;
342 
343 		switch (imsg.hdr.type) {
344 		case IMSG_CFG_SRV:
345 			config_getserver(env, &imsg);
346 			break;
347 		case IMSG_CFG_SOCK:
348 			config_getsock(env, &imsg);
349 			break;
350 		case IMSG_CFG_FD:
351 			config_getfd(env, &imsg);
352 			break;
353 		case IMSG_CFG_DONE:
354 			config_getcfg(env, &imsg);
355 			break;
356 		case IMSG_CTL_START:
357 			sockets_launch();
358 			break;
359 		default:
360 			fatalx("%s: unknown imsg type %d", __func__,
361 			    imsg.hdr.type);
362 		}
363 
364 		imsg_free(&imsg);
365 	}
366 
367 	if (!shut)
368 		imsg_event_add(iev);
369 	else {
370 		/* This pipe is dead.  Remove its event handler */
371 		event_del(&iev->ev);
372 		event_loopexit(NULL);
373 	}
374 }
375 
376 static void
377 sockets_sighdlr(int sig, short event, void *arg)
378 {
379 	switch (sig) {
380 	case SIGHUP:
381 		log_info("%s: ignoring SIGHUP", __func__);
382 		break;
383 	case SIGPIPE:
384 		log_info("%s: ignoring SIGPIPE", __func__);
385 		break;
386 	case SIGUSR1:
387 		log_info("%s: ignoring SIGUSR1", __func__);
388 		break;
389 	case SIGCHLD:
390 		break;
391 	default:
392 		log_info("SIGNAL: %d", sig);
393 		fatalx("unexpected signal");
394 	}
395 }
396 
397 static void
398 sockets_shutdown(void)
399 {
400 	struct server *srv, *tsrv;
401 	struct socket *sock, *tsock;
402 
403 	sockets_purge(gotwebd_env);
404 
405 	/* clean sockets */
406 	TAILQ_FOREACH_SAFE(sock, &gotwebd_env->sockets, entry, tsock) {
407 		TAILQ_REMOVE(&gotwebd_env->sockets, sock, entry);
408 		close(sock->fd);
409 		free(sock);
410 	}
411 
412 	/* clean servers */
413 	TAILQ_FOREACH_SAFE(srv, &gotwebd_env->servers, entry, tsrv)
414 		free(srv);
415 
416 	free(gotwebd_env);
417 }
418 
419 int
420 sockets_privinit(struct gotwebd *env, struct socket *sock)
421 {
422 	if (sock->conf.af_type == AF_UNIX) {
423 		log_debug("%s: initializing unix socket %s", __func__,
424 		    sock->conf.unix_socket_name);
425 		sock->fd = sockets_unix_socket_listen(env, sock);
426 		if (sock->fd == -1) {
427 			log_warnx("%s: create unix socket failed", __func__);
428 			return -1;
429 		}
430 	}
431 
432 	if (sock->conf.af_type == AF_INET || sock->conf.af_type == AF_INET6) {
433 		log_debug("%s: initializing %s FCGI socket on port %d for %s",
434 		    __func__, sock->conf.af_type == AF_INET ? "inet" : "inet6",
435 		    sock->conf.fcgi_socket_port, sock->conf.name);
436 		sock->fd = sockets_create_socket(&sock->conf.addr);
437 		if (sock->fd == -1) {
438 			log_warnx("%s: create FCGI socket failed", __func__);
439 			return -1;
440 		}
441 	}
442 
443 	return 0;
444 }
445 
446 static int
447 sockets_unix_socket_listen(struct gotwebd *env, struct socket *sock)
448 {
449 	struct sockaddr_un sun;
450 	struct socket *tsock;
451 	int u_fd = -1;
452 	mode_t old_umask, mode;
453 
454 	TAILQ_FOREACH(tsock, &env->sockets, entry) {
455 		if (strcmp(tsock->conf.unix_socket_name,
456 		    sock->conf.unix_socket_name) == 0 &&
457 		    tsock->fd != -1)
458 			return (tsock->fd);
459 	}
460 
461 	u_fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK| SOCK_CLOEXEC, 0);
462 	if (u_fd == -1) {
463 		log_warn("%s: socket", __func__);
464 		return -1;
465 	}
466 
467 	sun.sun_family = AF_UNIX;
468 	if (strlcpy(sun.sun_path, sock->conf.unix_socket_name,
469 	    sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
470 		log_warn("%s: %s name too long", __func__,
471 		    sock->conf.unix_socket_name);
472 		close(u_fd);
473 		return -1;
474 	}
475 
476 	if (unlink(sock->conf.unix_socket_name) == -1) {
477 		if (errno != ENOENT) {
478 			log_warn("%s: unlink %s", __func__,
479 			    sock->conf.unix_socket_name);
480 			close(u_fd);
481 			return -1;
482 		}
483 	}
484 
485 	old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
486 	mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP;
487 
488 	if (bind(u_fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
489 		log_warn("%s: bind: %s", __func__, sock->conf.unix_socket_name);
490 		close(u_fd);
491 		(void)umask(old_umask);
492 		return -1;
493 	}
494 
495 	(void)umask(old_umask);
496 
497 	if (chmod(sock->conf.unix_socket_name, mode) == -1) {
498 		log_warn("%s: chmod", __func__);
499 		close(u_fd);
500 		(void)unlink(sock->conf.unix_socket_name);
501 		return -1;
502 	}
503 
504 	if (chown(sock->conf.unix_socket_name, env->pw->pw_uid,
505 	    env->pw->pw_gid) == -1) {
506 		log_warn("%s: chown", __func__);
507 		close(u_fd);
508 		(void)unlink(sock->conf.unix_socket_name);
509 		return -1;
510 	}
511 
512 	if (listen(u_fd, SOCKS_BACKLOG) == -1) {
513 		log_warn("%s: listen", __func__);
514 		return -1;
515 	}
516 
517 	return u_fd;
518 }
519 
520 static int
521 sockets_create_socket(struct address *a)
522 {
523 	int fd = -1, o_val = 1, flags;
524 
525 	fd = socket(a->ai_family, a->ai_socktype, a->ai_protocol);
526 	if (fd == -1)
527 		return -1;
528 
529 	log_debug("%s: opened socket (%d) for %s", __func__,
530 	    fd, a->ifname);
531 
532 	if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &o_val,
533 	    sizeof(int)) == -1) {
534 		log_warn("%s: setsockopt error", __func__);
535 		close(fd);
536 		return -1;
537 	}
538 
539 	/* non-blocking */
540 	flags = fcntl(fd, F_GETFL);
541 	flags |= O_NONBLOCK;
542 	if (fcntl(fd, F_SETFL, flags) == -1) {
543 		log_info("%s: could not enable non-blocking I/O", __func__);
544 		close(fd);
545 		return -1;
546 	}
547 
548 	if (bind(fd, (struct sockaddr *)&a->ss, a->slen) == -1) {
549 		close(fd);
550 		log_info("%s: can't bind to port %d", __func__, a->port);
551 		return -1;
552 	}
553 
554 	if (listen(fd, SOMAXCONN) == -1) {
555 		log_warn("%s, unable to listen on socket", __func__);
556 		close(fd);
557 		return -1;
558 	}
559 
560 	return (fd);
561 }
562 
563 static int
564 sockets_accept_reserve(int sockfd, struct sockaddr *addr, socklen_t *addrlen,
565     int reserve, volatile int *counter)
566 {
567 	int ret;
568 
569 	if (getdtablecount() + reserve +
570 	    ((*counter + 1) * FD_NEEDED) >= getdtablesize()) {
571 		log_debug("inflight fds exceeded");
572 		errno = EMFILE;
573 		return -1;
574 	}
575 
576 	if ((ret = accept4(sockfd, addr, addrlen,
577 	    SOCK_NONBLOCK | SOCK_CLOEXEC)) > -1) {
578 		(*counter)++;
579 		log_debug("inflight incremented, now %d", *counter);
580 	}
581 
582 	return ret;
583 }
584 
585 static void
586 sockets_accept_paused(int fd, short events, void *arg)
587 {
588 	struct socket *sock = (struct socket *)arg;
589 
590 	event_add(&sock->ev, NULL);
591 }
592 
593 void
594 sockets_socket_accept(int fd, short event, void *arg)
595 {
596 	struct socket *sock = (struct socket *)arg;
597 	struct sockaddr_storage ss;
598 	struct timeval backoff;
599 	struct request *c = NULL;
600 	socklen_t len;
601 	int s;
602 
603 	backoff.tv_sec = 1;
604 	backoff.tv_usec = 0;
605 
606 	event_add(&sock->ev, NULL);
607 	if (event & EV_TIMEOUT)
608 		return;
609 
610 	len = sizeof(ss);
611 
612 	s = sockets_accept_reserve(fd, (struct sockaddr *)&ss, &len,
613 	    FD_RESERVE, &cgi_inflight);
614 
615 	if (s == -1) {
616 		switch (errno) {
617 		case EINTR:
618 		case EWOULDBLOCK:
619 		case ECONNABORTED:
620 			return;
621 		case EMFILE:
622 		case ENFILE:
623 			event_del(&sock->ev);
624 			evtimer_add(&sock->pause, &backoff);
625 			return;
626 		default:
627 			log_warn("%s: accept", __func__);
628 		}
629 	}
630 
631 	if (client_cnt > GOTWEBD_MAXCLIENTS)
632 		goto err;
633 
634 	c = calloc(1, sizeof(struct request));
635 	if (c == NULL) {
636 		log_warn("%s", __func__);
637 		close(s);
638 		cgi_inflight--;
639 		return;
640 	}
641 
642 	c->tp = template(c, &fcgi_write, c->outbuf, sizeof(c->outbuf));
643 	if (c->tp == NULL) {
644 		log_warn("%s", __func__);
645 		close(s);
646 		cgi_inflight--;
647 		free(c);
648 		return;
649 	}
650 
651 	c->fd = s;
652 	c->sock = sock;
653 	memcpy(c->priv_fd, sock->priv_fd, sizeof(c->priv_fd));
654 	c->buf_pos = 0;
655 	c->buf_len = 0;
656 	c->request_started = 0;
657 	c->sock->client_status = CLIENT_CONNECT;
658 
659 	event_set(&c->ev, s, EV_READ|EV_PERSIST, fcgi_request, c);
660 	event_add(&c->ev, NULL);
661 
662 	evtimer_set(&c->tmo, fcgi_timeout, c);
663 	evtimer_add(&c->tmo, &timeout);
664 
665 	client_cnt++;
666 
667 	return;
668 err:
669 	cgi_inflight--;
670 	close(s);
671 	if (c != NULL)
672 		free(c);
673 }
674 
675 static void
676 sockets_rlimit(int maxfd)
677 {
678 	struct rlimit rl;
679 
680 	if (getrlimit(RLIMIT_NOFILE, &rl) == -1)
681 		fatal("%s: failed to get resource limit", __func__);
682 	log_debug("%s: max open files %llu", __func__,
683 	    (unsigned long long)rl.rlim_max);
684 
685 	/*
686 	 * Allow the maximum number of open file descriptors for this
687 	 * login class (which should be the class "daemon" by default).
688 	 */
689 	if (maxfd == -1)
690 		rl.rlim_cur = rl.rlim_max;
691 	else
692 		rl.rlim_cur = MAXIMUM(rl.rlim_max, (rlim_t)maxfd);
693 	if (setrlimit(RLIMIT_NOFILE, &rl) == -1)
694 		fatal("%s: failed to set resource limit", __func__);
695 }