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Date:: Tue Aug 16 14:42:50 2022 UTC
Message:: gotwebd: do not allocate address list heads separately, this is unnecessary 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->sockets);
408 	free(gotwebd_env->servers);
409 	free(gotwebd_env);
410 }
411 
412 int
413 sockets_privinit(struct gotwebd *env, struct socket *sock)
414 {
415 	struct privsep *ps = env->gotwebd_ps;
416 
417 	if (sock->conf.type == UNIX) {
418 		log_debug("%s: initializing unix socket %s", __func__,
419 		    sock->conf.unix_socket_name);
420 		sock->fd = sockets_unix_socket_listen(ps, sock);
421 		if (sock->fd == -1) {
422 			log_warnx("%s: create unix socket failed", __func__);
423 			return -1;
424 		}
425 	}
426 
427 	if (sock->conf.type == FCGI) {
428 		log_debug("%s: initializing fcgi socket for %s", __func__,
429 		    sock->conf.name);
430 		sock->fd = sockets_create_socket(&sock->conf.al,
431 		    sock->conf.fcgi_socket_port);
432 		if (sock->fd == -1) {
433 			log_warnx("%s: create unix socket failed", __func__);
434 			return -1;
435 		}
436 	}
437 
438 	return 0;
439 }
440 
441 int
442 sockets_unix_socket_listen(struct privsep *ps, struct socket *sock)
443 {
444 	struct gotwebd *env = ps->ps_env;
445 	struct sockaddr_un sun;
446 	struct socket *tsock;
447 	int u_fd = -1;
448 	mode_t old_umask, mode;
449 
450 	TAILQ_FOREACH(tsock, env->sockets, entry) {
451 		if (strcmp(tsock->conf.unix_socket_name,
452 		    sock->conf.unix_socket_name) == 0 &&
453 		    tsock->fd != -1)
454 			return (tsock->fd);
455 	}
456 
457 	u_fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK| SOCK_CLOEXEC, 0);
458 	if (u_fd == -1) {
459 		log_warn("%s: socket", __func__);
460 		return -1;
461 	}
462 
463 	sun.sun_family = AF_UNIX;
464 	if (strlcpy(sun.sun_path, sock->conf.unix_socket_name,
465 	    sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
466 		log_warn("%s: %s name too long", __func__,
467 		    sock->conf.unix_socket_name);
468 		close(u_fd);
469 		return -1;
470 	}
471 
472 	if (unlink(sock->conf.unix_socket_name) == -1) {
473 		if (errno != ENOENT) {
474 			log_warn("%s: unlink %s", __func__,
475 			    sock->conf.unix_socket_name);
476 			close(u_fd);
477 			return -1;
478 		}
479 	}
480 
481 	old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
482 	mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP;
483 
484 	if (bind(u_fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
485 		log_warn("%s: bind: %s", __func__, sock->conf.unix_socket_name);
486 		close(u_fd);
487 		(void)umask(old_umask);
488 		return -1;
489 	}
490 
491 	(void)umask(old_umask);
492 
493 	if (chmod(sock->conf.unix_socket_name, mode) == -1) {
494 		log_warn("%s: chmod", __func__);
495 		close(u_fd);
496 		(void)unlink(sock->conf.unix_socket_name);
497 		return -1;
498 	}
499 
500 	if (chown(sock->conf.unix_socket_name, ps->ps_pw->pw_uid,
501 	    ps->ps_pw->pw_gid) == -1) {
502 		log_warn("%s: chown", __func__);
503 		close(u_fd);
504 		(void)unlink(sock->conf.unix_socket_name);
505 		return -1;
506 	}
507 
508 	if (listen(u_fd, SOCKS_BACKLOG) == -1) {
509 		log_warn("%s: listen", __func__);
510 		return -1;
511 	}
512 
513 	return u_fd;
514 }
515 
516 int
517 sockets_create_socket(struct addresslist *al, in_port_t port)
518 {
519 	struct addrinfo hints;
520 	struct address *a;
521 	int fd = -1, o_val = 1, flags;
522 
523 	memset(&hints, 0, sizeof(hints));
524 	hints.ai_family = AF_UNSPEC;
525 	hints.ai_socktype = SOCK_STREAM;
526 	hints.ai_flags |= AI_PASSIVE;
527 
528 	TAILQ_FOREACH(a, al, entry) {
529 		switch (a->ss.ss_family) {
530 		case AF_INET:
531 			((struct sockaddr_in *)(&a->ss))->sin_port = port;
532 			break;
533 		case AF_INET6:
534 			((struct sockaddr_in6 *)(&a->ss))->sin6_port = port;
535 			break;
536 		default:
537 			log_warnx("%s: unknown address family", __func__);
538 			goto fail;
539 		}
540 
541 		fd = socket(a->ss.ss_family, hints.ai_socktype,
542 		    a->ipproto);
543 			log_debug("%s: opening socket (%d) for %s", __func__,
544 			    fd, a->ifname);
545 
546 		if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &o_val,
547 		    sizeof(int)) == -1) {
548 			log_warn("%s: setsockopt error", __func__);
549 			return -1;
550 		}
551 
552 		/* non-blocking */
553 		flags = fcntl(fd, F_GETFL);
554 		flags |= O_NONBLOCK;
555 		fcntl(fd, F_SETFL, flags);
556 
557 		if (bind(fd, (struct sockaddr *)&a->ss, a->ss.ss_len) == -1) {
558 			close(fd);
559 			log_info("%s: can't bind to port %d", __func__,
560 			    ntohs(port));
561 			goto fail;
562 		}
563 
564 		if (listen(fd, SOMAXCONN) == -1) {
565 			log_warn("%s, unable to listen on socket", __func__);
566 			goto fail;
567 		}
568 	}
569 
570 	free(a);
571 	return (fd);
572 fail:
573 	free(a);
574 	return -1;
575 }
576 
577 int
578 sockets_accept_reserve(int sockfd, struct sockaddr *addr, socklen_t *addrlen,
579     int reserve, volatile int *counter)
580 {
581 	int ret;
582 
583 	if (getdtablecount() + reserve +
584 	    ((*counter + 1) * FD_NEEDED) >= getdtablesize()) {
585 		log_debug("inflight fds exceeded");
586 		errno = EMFILE;
587 		return -1;
588 	}
589 
590 	if ((ret = accept4(sockfd, addr, addrlen,
591 	    SOCK_NONBLOCK | SOCK_CLOEXEC)) > -1) {
592 		(*counter)++;
593 		log_debug("inflight incremented, now %d", *counter);
594 	}
595 
596 	return ret;
597 }
598 
599 void
600 sockets_accept_paused(int fd, short events, void *arg)
601 {
602 	struct socket *sock = (struct socket *)arg;
603 
604 	event_add(&sock->ev, NULL);
605 }
606 
607 void
608 sockets_socket_accept(int fd, short event, void *arg)
609 {
610 	struct socket *sock = (struct socket *)arg;
611 	struct sockaddr_storage ss;
612 	struct timeval backoff;
613 	struct request *c = NULL;
614 	socklen_t len;
615 	int s;
616 
617 	backoff.tv_sec = 1;
618 	backoff.tv_usec = 0;
619 
620 	event_add(&sock->ev, NULL);
621 	if (event & EV_TIMEOUT)
622 		return;
623 
624 	len = sizeof(ss);
625 
626 	s = sockets_accept_reserve(fd, (struct sockaddr *)&ss, &len,
627 	    FD_RESERVE, &cgi_inflight);
628 
629 	if (s == -1) {
630 		switch (errno) {
631 		case EINTR:
632 		case EWOULDBLOCK:
633 		case ECONNABORTED:
634 			return;
635 		case EMFILE:
636 		case ENFILE:
637 			event_del(&sock->ev);
638 			evtimer_add(&sock->pause, &backoff);
639 			return;
640 		default:
641 			log_warn("%s: accept", __func__);
642 		}
643 	}
644 
645 	if (client_cnt > GOTWEBD_MAXCLIENTS)
646 		goto err;
647 
648 	c = calloc(1, sizeof(struct request));
649 	if (c == NULL) {
650 		log_warn("%s", __func__);
651 		close(s);
652 		cgi_inflight--;
653 		return;
654 	}
655 
656 	c->fd = s;
657 	c->sock = sock;
658 	memcpy(c->priv_fd, sock->priv_fd, sizeof(c->priv_fd));
659 	c->buf_pos = 0;
660 	c->buf_len = 0;
661 	c->request_started = 0;
662 	c->sock->client_status = CLIENT_CONNECT;
663 
664 	event_set(&c->ev, s, EV_READ, fcgi_request, c);
665 	event_add(&c->ev, NULL);
666 
667 	evtimer_set(&c->tmo, fcgi_timeout, c);
668 	evtimer_add(&c->tmo, &timeout);
669 
670 	client_cnt++;
671 
672 	return;
673 err:
674 	cgi_inflight--;
675 	close(s);
676 	if (c != NULL)
677 		free(c);
678 }
679 
680 void
681 sockets_rlimit(int maxfd)
682 {
683 	struct rlimit rl;
684 
685 	if (getrlimit(RLIMIT_NOFILE, &rl) == -1)
686 		fatal("%s: failed to get resource limit", __func__);
687 	log_debug("%s: max open files %llu", __func__,
688 	    (unsigned long long)rl.rlim_max);
689 
690 	/*
691 	 * Allow the maximum number of open file descriptors for this
692 	 * login class (which should be the class "daemon" by default).
693 	 */
694 	if (maxfd == -1)
695 		rl.rlim_cur = rl.rlim_max;
696 	else
697 		rl.rlim_cur = MAXIMUM(rl.rlim_max, (rlim_t)maxfd);
698 	if (setrlimit(RLIMIT_NOFILE, &rl) == -1)
699 		fatal("%s: failed to set resource limit", __func__);
700 }