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Date:: Tue Aug 16 16:26:59 2022 UTC
Message:: gotwebd: do not allocate server/socket list heads separately ok millert@
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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 
55 #include "proc.h"
56 #include "gotwebd.h"
57 
58 #define SOCKS_BACKLOG 5
59 #define MAXIMUM(a, b)	(((a) > (b)) ? (a) : (b))
60 
61 
62 volatile int client_cnt;
63 
64 struct timeval	timeout = { TIMEOUT_DEFAULT, 0 };
65 
66 void	 sockets_sighdlr(int, short, void *);
67 void	 sockets_run(struct privsep *, struct privsep_proc *, void *);
68 void	 sockets_launch(void);
69 void	 sockets_purge(struct gotwebd *);
70 void	 sockets_accept_paused(int, short, void *);
71 void	 sockets_dup_new_socket(struct socket *, struct socket *);
72 void	 sockets_rlimit(int);
73 
74 
75 int	 sockets_dispatch_gotwebd(int, struct privsep_proc *, struct imsg *);
76 int	 sockets_unix_socket_listen(struct privsep *, struct socket *);
77 int	 sockets_create_socket(struct addresslist *, in_port_t);
78 int	 sockets_accept_reserve(int, struct sockaddr *, socklen_t *, int,
79 	    volatile int *);
80 
81 struct socket
82 	*sockets_conf_new_socket(struct gotwebd *, struct server *, int, int,
83 	    int);
84 
85 int cgi_inflight = 0;
86 
87 static struct privsep_proc procs[] = {
88 	{ "gotwebd",	PROC_GOTWEBD,	sockets_dispatch_gotwebd  },
89 };
90 
91 void
92 sockets(struct privsep *ps, struct privsep_proc *p)
93 {
94 	proc_run(ps, p, procs, nitems(procs), sockets_run, NULL);
95 }
96 
97 void
98 sockets_run(struct privsep *ps, struct privsep_proc *p, void *arg)
99 {
100 	if (config_init(ps->ps_env) == -1)
101 		fatal("failed to initialize configuration");
102 
103 	p->p_shutdown = sockets_shutdown;
104 
105 	sockets_rlimit(-1);
106 
107 	signal_del(&ps->ps_evsigchld);
108 	signal_set(&ps->ps_evsigchld, SIGCHLD, sockets_sighdlr, ps);
109 	signal_add(&ps->ps_evsigchld, NULL);
110 
111 #ifndef PROFILE
112 	if (pledge("stdio rpath wpath cpath inet recvfd proc exec sendfd",
113 	    NULL) == -1)
114 		fatal("pledge");
115 #endif
116 }
117 
118 void
119 sockets_parse_sockets(struct gotwebd *env)
120 {
121 	struct server *srv;
122 	struct socket *sock, *new_sock = NULL;
123 	struct address *a;
124 	int sock_id = 0, ipv4 = 0, ipv6 = 0;
125 
126 	TAILQ_FOREACH(srv, &env->servers, entry) {
127 		if (srv->unix_socket) {
128 			sock_id++;
129 			new_sock = sockets_conf_new_socket(env, srv,
130 			    sock_id, UNIX, 0);
131 			TAILQ_INSERT_TAIL(&env->sockets, new_sock, entry);
132 		}
133 
134 		if (srv->fcgi_socket) {
135 			sock_id++;
136 			new_sock = sockets_conf_new_socket(env, srv,
137 			    sock_id, FCGI, 0);
138 			TAILQ_INSERT_TAIL(&env->sockets, new_sock, entry);
139 
140 			/* add ipv6 children */
141 			TAILQ_FOREACH(sock, &env->sockets, entry) {
142 				ipv4 = ipv6 = 0;
143 
144 				TAILQ_FOREACH(a, &sock->conf.al, entry) {
145 					if (a->ss.ss_family == AF_INET)
146 						ipv4 = 1;
147 					if (a->ss.ss_family == AF_INET6)
148 						ipv6 = 1;
149 				}
150 
151 				/* create ipv6 sock */
152 				if (ipv4 == 1 && ipv6 == 1) {
153 					sock_id++;
154 					sock->conf.child_id = sock_id;
155 					new_sock = sockets_conf_new_socket(env,
156 					    srv, sock_id, FCGI, 1);
157 					sockets_dup_new_socket(sock, new_sock);
158 					TAILQ_INSERT_TAIL(&env->sockets,
159 					    new_sock, entry);
160 					continue;
161 				}
162 			}
163 		}
164 	}
165 }
166 
167 void
168 sockets_dup_new_socket(struct socket *p_sock, struct socket *sock)
169 {
170 	struct address *a, *acp;
171 	int n;
172 
173 	sock->conf.parent_id = p_sock->conf.id;
174 	sock->conf.ipv4 = 0;
175 	sock->conf.ipv6 = 1;
176 
177 	memcpy(&sock->conf.srv_name, p_sock->conf.srv_name,
178 	    sizeof(sock->conf.srv_name));
179 
180 	n = snprintf(sock->conf.name, GOTWEBD_MAXTEXT, "%s_child",
181 	    p_sock->conf.srv_name);
182 	if (n < 0 || (size_t)n >= GOTWEBD_MAXTEXT) {
183 		free(p_sock);
184 		free(sock);
185 		fatalx("%s: snprintf", __func__);
186 	}
187 
188 	TAILQ_FOREACH(a, &p_sock->conf.al, entry) {
189 		if (a->ss.ss_family == AF_INET)
190 			continue;
191 
192 		if ((acp = calloc(1, sizeof(*acp))) == NULL)
193 			fatal("%s: calloc", __func__);
194 		memcpy(&acp->ss, &a->ss, sizeof(acp->ss));
195 		acp->ipproto = a->ipproto;
196 		acp->prefixlen = a->prefixlen;
197 		acp->port = a->port;
198 		if (strlen(a->ifname) != 0) {
199 			if (strlcpy(acp->ifname, a->ifname,
200 			    sizeof(acp->ifname)) >= sizeof(acp->ifname)) {
201 				fatalx("%s: interface name truncated",
202 				    __func__);
203 			}
204 		}
205 
206 		TAILQ_INSERT_TAIL(&sock->conf.al, acp, entry);
207 	}
208 }
209 
210 struct socket *
211 sockets_conf_new_socket(struct gotwebd *env, struct server *srv, int id,
212     int type, int is_dup)
213 {
214 	struct socket *sock;
215 	struct address *a, *acp;
216 	int n;
217 
218 	if ((sock = calloc(1, sizeof(*sock))) == NULL)
219 		fatalx("%s: calloc", __func__);
220 
221 	TAILQ_INIT(&sock->conf.al);
222 
223 	sock->conf.parent_id = 0;
224 	sock->conf.id = id;
225 
226 	sock->fd = -1;
227 
228 	sock->conf.type = type;
229 
230 	if (type == UNIX) {
231 		if (strlcpy(sock->conf.unix_socket_name,
232 		    srv->unix_socket_name,
233 		    sizeof(sock->conf.unix_socket_name)) >=
234 		    sizeof(sock->conf.unix_socket_name)) {
235 			free(sock);
236 			fatalx("%s: strlcpy", __func__);
237 		}
238 	} else
239 		sock->conf.ipv4 = 1;
240 
241 	sock->conf.fcgi_socket_port = srv->fcgi_socket_port;
242 
243 	if (is_dup)
244 		goto done;
245 
246 	n = snprintf(sock->conf.name, GOTWEBD_MAXTEXT, "%s_parent",
247 	    srv->name);
248 	if (n < 0 || (size_t)n >= GOTWEBD_MAXTEXT) {
249 		free(sock);
250 		fatalx("%s: snprintf", __func__);
251 	}
252 
253 	if (strlcpy(sock->conf.srv_name, srv->name,
254 	    sizeof(sock->conf.srv_name)) >= sizeof(sock->conf.srv_name)) {
255 		free(sock);
256 		fatalx("%s: strlcpy", __func__);
257 	}
258 
259 	TAILQ_FOREACH(a, &srv->al, entry) {
260 		if ((acp = calloc(1, sizeof(*acp))) == NULL) {
261 			free(sock);
262 			fatal("%s: calloc", __func__);
263 		}
264 		memcpy(&acp->ss, &a->ss, sizeof(acp->ss));
265 		acp->ipproto = a->ipproto;
266 		acp->prefixlen = a->prefixlen;
267 		acp->port = a->port;
268 		if (strlen(a->ifname) != 0) {
269 			if (strlcpy(acp->ifname, a->ifname,
270 			    sizeof(acp->ifname)) >= sizeof(acp->ifname)) {
271 				fatalx("%s: interface name truncated",
272 				    __func__);
273 			}
274 		}
275 
276 		TAILQ_INSERT_TAIL(&sock->conf.al, acp, entry);
277 	}
278 done:
279 	return (sock);
280 }
281 
282 void
283 sockets_launch(void)
284 {
285 	struct socket *sock;
286 
287 	TAILQ_FOREACH(sock, &gotwebd_env->sockets, entry) {
288 		log_debug("%s: configuring socket %d (%d)", __func__,
289 		    sock->conf.id, sock->fd);
290 
291 		event_set(&sock->ev, sock->fd, EV_READ | EV_PERSIST,
292 		    sockets_socket_accept, sock);
293 
294 		if (event_add(&sock->ev, NULL))
295 			fatalx("event add sock");
296 
297 		evtimer_set(&sock->pause, sockets_accept_paused, sock);
298 
299 		log_debug("%s: running socket listener %d", __func__,
300 		    sock->conf.id);
301 	}
302 }
303 
304 void
305 sockets_purge(struct gotwebd *env)
306 {
307 	struct socket *sock, *tsock;
308 
309 	/* shutdown and remove sockets */
310 	TAILQ_FOREACH_SAFE(sock, &env->sockets, entry, tsock) {
311 		if (event_initialized(&sock->ev))
312 			event_del(&sock->ev);
313 		if (evtimer_initialized(&sock->evt))
314 			evtimer_del(&sock->evt);
315 		if (evtimer_initialized(&sock->pause))
316 			evtimer_del(&sock->pause);
317 		if (sock->fd != -1)
318 			close(sock->fd);
319 		TAILQ_REMOVE(&env->sockets, sock, entry);
320 	}
321 }
322 
323 int
324 sockets_dispatch_gotwebd(int fd, struct privsep_proc *p, struct imsg *imsg)
325 {
326 	struct privsep *ps = p->p_ps;
327 	int res = 0, cmd = 0, verbose;
328 
329 	switch (imsg->hdr.type) {
330 	case IMSG_CFG_SRV:
331 		config_getserver(gotwebd_env, imsg);
332 		break;
333 	case IMSG_CFG_SOCK:
334 		config_getsock(gotwebd_env, imsg);
335 		break;
336 	case IMSG_CFG_FD:
337 		config_getfd(gotwebd_env, imsg);
338 		break;
339 	case IMSG_CFG_DONE:
340 		config_getcfg(gotwebd_env, imsg);
341 		break;
342 	case IMSG_CTL_START:
343 		sockets_launch();
344 		break;
345 	case IMSG_CTL_VERBOSE:
346 		IMSG_SIZE_CHECK(imsg, &verbose);
347 		memcpy(&verbose, imsg->data, sizeof(verbose));
348 		log_setverbose(verbose);
349 		break;
350 	default:
351 		return -1;
352 	}
353 
354 	switch (cmd) {
355 	case 0:
356 		break;
357 	default:
358 		if (proc_compose_imsg(ps, PROC_GOTWEBD, -1, cmd,
359 		    imsg->hdr.peerid, -1, &res, sizeof(res)) == -1)
360 			return -1;
361 		break;
362 	}
363 
364 	return 0;
365 }
366 
367 void
368 sockets_sighdlr(int sig, short event, void *arg)
369 {
370 	switch (sig) {
371 	case SIGHUP:
372 		log_info("%s: ignoring SIGHUP", __func__);
373 		break;
374 	case SIGPIPE:
375 		log_info("%s: ignoring SIGPIPE", __func__);
376 		break;
377 	case SIGUSR1:
378 		log_info("%s: ignoring SIGUSR1", __func__);
379 		break;
380 	case SIGCHLD:
381 		break;
382 	default:
383 		log_info("SIGNAL: %d", sig);
384 		fatalx("unexpected signal");
385 	}
386 }
387 
388 void
389 sockets_shutdown(void)
390 {
391 	struct server *srv, *tsrv;
392 	struct socket *sock, *tsock;
393 
394 	sockets_purge(gotwebd_env);
395 
396 	/* clean sockets */
397 	TAILQ_FOREACH_SAFE(sock, &gotwebd_env->sockets, entry, tsock) {
398 		TAILQ_REMOVE(&gotwebd_env->sockets, sock, entry);
399 		close(sock->fd);
400 		free(sock);
401 	}
402 
403 	/* clean servers */
404 	TAILQ_FOREACH_SAFE(srv, &gotwebd_env->servers, entry, tsrv)
405 		free(srv);
406 
407 	free(gotwebd_env);
408 }
409 
410 int
411 sockets_privinit(struct gotwebd *env, struct socket *sock)
412 {
413 	struct privsep *ps = env->gotwebd_ps;
414 
415 	if (sock->conf.type == UNIX) {
416 		log_debug("%s: initializing unix socket %s", __func__,
417 		    sock->conf.unix_socket_name);
418 		sock->fd = sockets_unix_socket_listen(ps, sock);
419 		if (sock->fd == -1) {
420 			log_warnx("%s: create unix socket failed", __func__);
421 			return -1;
422 		}
423 	}
424 
425 	if (sock->conf.type == FCGI) {
426 		log_debug("%s: initializing fcgi socket for %s", __func__,
427 		    sock->conf.name);
428 		sock->fd = sockets_create_socket(&sock->conf.al,
429 		    sock->conf.fcgi_socket_port);
430 		if (sock->fd == -1) {
431 			log_warnx("%s: create unix socket failed", __func__);
432 			return -1;
433 		}
434 	}
435 
436 	return 0;
437 }
438 
439 int
440 sockets_unix_socket_listen(struct privsep *ps, struct socket *sock)
441 {
442 	struct gotwebd *env = ps->ps_env;
443 	struct sockaddr_un sun;
444 	struct socket *tsock;
445 	int u_fd = -1;
446 	mode_t old_umask, mode;
447 
448 	TAILQ_FOREACH(tsock, &env->sockets, entry) {
449 		if (strcmp(tsock->conf.unix_socket_name,
450 		    sock->conf.unix_socket_name) == 0 &&
451 		    tsock->fd != -1)
452 			return (tsock->fd);
453 	}
454 
455 	u_fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK| SOCK_CLOEXEC, 0);
456 	if (u_fd == -1) {
457 		log_warn("%s: socket", __func__);
458 		return -1;
459 	}
460 
461 	sun.sun_family = AF_UNIX;
462 	if (strlcpy(sun.sun_path, sock->conf.unix_socket_name,
463 	    sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
464 		log_warn("%s: %s name too long", __func__,
465 		    sock->conf.unix_socket_name);
466 		close(u_fd);
467 		return -1;
468 	}
469 
470 	if (unlink(sock->conf.unix_socket_name) == -1) {
471 		if (errno != ENOENT) {
472 			log_warn("%s: unlink %s", __func__,
473 			    sock->conf.unix_socket_name);
474 			close(u_fd);
475 			return -1;
476 		}
477 	}
478 
479 	old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
480 	mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP;
481 
482 	if (bind(u_fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
483 		log_warn("%s: bind: %s", __func__, sock->conf.unix_socket_name);
484 		close(u_fd);
485 		(void)umask(old_umask);
486 		return -1;
487 	}
488 
489 	(void)umask(old_umask);
490 
491 	if (chmod(sock->conf.unix_socket_name, mode) == -1) {
492 		log_warn("%s: chmod", __func__);
493 		close(u_fd);
494 		(void)unlink(sock->conf.unix_socket_name);
495 		return -1;
496 	}
497 
498 	if (chown(sock->conf.unix_socket_name, ps->ps_pw->pw_uid,
499 	    ps->ps_pw->pw_gid) == -1) {
500 		log_warn("%s: chown", __func__);
501 		close(u_fd);
502 		(void)unlink(sock->conf.unix_socket_name);
503 		return -1;
504 	}
505 
506 	if (listen(u_fd, SOCKS_BACKLOG) == -1) {
507 		log_warn("%s: listen", __func__);
508 		return -1;
509 	}
510 
511 	return u_fd;
512 }
513 
514 int
515 sockets_create_socket(struct addresslist *al, in_port_t port)
516 {
517 	struct addrinfo hints;
518 	struct address *a;
519 	int fd = -1, o_val = 1, flags;
520 
521 	memset(&hints, 0, sizeof(hints));
522 	hints.ai_family = AF_UNSPEC;
523 	hints.ai_socktype = SOCK_STREAM;
524 	hints.ai_flags |= AI_PASSIVE;
525 
526 	TAILQ_FOREACH(a, al, entry) {
527 		switch (a->ss.ss_family) {
528 		case AF_INET:
529 			((struct sockaddr_in *)(&a->ss))->sin_port = port;
530 			break;
531 		case AF_INET6:
532 			((struct sockaddr_in6 *)(&a->ss))->sin6_port = port;
533 			break;
534 		default:
535 			log_warnx("%s: unknown address family", __func__);
536 			goto fail;
537 		}
538 
539 		fd = socket(a->ss.ss_family, hints.ai_socktype,
540 		    a->ipproto);
541 			log_debug("%s: opening socket (%d) for %s", __func__,
542 			    fd, a->ifname);
543 
544 		if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &o_val,
545 		    sizeof(int)) == -1) {
546 			log_warn("%s: setsockopt error", __func__);
547 			return -1;
548 		}
549 
550 		/* non-blocking */
551 		flags = fcntl(fd, F_GETFL);
552 		flags |= O_NONBLOCK;
553 		fcntl(fd, F_SETFL, flags);
554 
555 		if (bind(fd, (struct sockaddr *)&a->ss, a->ss.ss_len) == -1) {
556 			close(fd);
557 			log_info("%s: can't bind to port %d", __func__,
558 			    ntohs(port));
559 			goto fail;
560 		}
561 
562 		if (listen(fd, SOMAXCONN) == -1) {
563 			log_warn("%s, unable to listen on socket", __func__);
564 			goto fail;
565 		}
566 	}
567 
568 	free(a);
569 	return (fd);
570 fail:
571 	free(a);
572 	return -1;
573 }
574 
575 int
576 sockets_accept_reserve(int sockfd, struct sockaddr *addr, socklen_t *addrlen,
577     int reserve, volatile int *counter)
578 {
579 	int ret;
580 
581 	if (getdtablecount() + reserve +
582 	    ((*counter + 1) * FD_NEEDED) >= getdtablesize()) {
583 		log_debug("inflight fds exceeded");
584 		errno = EMFILE;
585 		return -1;
586 	}
587 
588 	if ((ret = accept4(sockfd, addr, addrlen,
589 	    SOCK_NONBLOCK | SOCK_CLOEXEC)) > -1) {
590 		(*counter)++;
591 		log_debug("inflight incremented, now %d", *counter);
592 	}
593 
594 	return ret;
595 }
596 
597 void
598 sockets_accept_paused(int fd, short events, void *arg)
599 {
600 	struct socket *sock = (struct socket *)arg;
601 
602 	event_add(&sock->ev, NULL);
603 }
604 
605 void
606 sockets_socket_accept(int fd, short event, void *arg)
607 {
608 	struct socket *sock = (struct socket *)arg;
609 	struct sockaddr_storage ss;
610 	struct timeval backoff;
611 	struct request *c = NULL;
612 	socklen_t len;
613 	int s;
614 
615 	backoff.tv_sec = 1;
616 	backoff.tv_usec = 0;
617 
618 	event_add(&sock->ev, NULL);
619 	if (event & EV_TIMEOUT)
620 		return;
621 
622 	len = sizeof(ss);
623 
624 	s = sockets_accept_reserve(fd, (struct sockaddr *)&ss, &len,
625 	    FD_RESERVE, &cgi_inflight);
626 
627 	if (s == -1) {
628 		switch (errno) {
629 		case EINTR:
630 		case EWOULDBLOCK:
631 		case ECONNABORTED:
632 			return;
633 		case EMFILE:
634 		case ENFILE:
635 			event_del(&sock->ev);
636 			evtimer_add(&sock->pause, &backoff);
637 			return;
638 		default:
639 			log_warn("%s: accept", __func__);
640 		}
641 	}
642 
643 	if (client_cnt > GOTWEBD_MAXCLIENTS)
644 		goto err;
645 
646 	c = calloc(1, sizeof(struct request));
647 	if (c == NULL) {
648 		log_warn("%s", __func__);
649 		close(s);
650 		cgi_inflight--;
651 		return;
652 	}
653 
654 	c->fd = s;
655 	c->sock = sock;
656 	memcpy(c->priv_fd, sock->priv_fd, sizeof(c->priv_fd));
657 	c->buf_pos = 0;
658 	c->buf_len = 0;
659 	c->request_started = 0;
660 	c->sock->client_status = CLIENT_CONNECT;
661 
662 	event_set(&c->ev, s, EV_READ, fcgi_request, c);
663 	event_add(&c->ev, NULL);
664 
665 	evtimer_set(&c->tmo, fcgi_timeout, c);
666 	evtimer_add(&c->tmo, &timeout);
667 
668 	client_cnt++;
669 
670 	return;
671 err:
672 	cgi_inflight--;
673 	close(s);
674 	if (c != NULL)
675 		free(c);
676 }
677 
678 void
679 sockets_rlimit(int maxfd)
680 {
681 	struct rlimit rl;
682 
683 	if (getrlimit(RLIMIT_NOFILE, &rl) == -1)
684 		fatal("%s: failed to get resource limit", __func__);
685 	log_debug("%s: max open files %llu", __func__,
686 	    (unsigned long long)rl.rlim_max);
687 
688 	/*
689 	 * Allow the maximum number of open file descriptors for this
690 	 * login class (which should be the class "daemon" by default).
691 	 */
692 	if (maxfd == -1)
693 		rl.rlim_cur = rl.rlim_max;
694 	else
695 		rl.rlim_cur = MAXIMUM(rl.rlim_max, (rlim_t)maxfd);
696 	if (setrlimit(RLIMIT_NOFILE, &rl) == -1)
697 		fatal("%s: failed to set resource limit", __func__);
698 }