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Date:: Tue Sep 20 16:28:14 2022 UTC
Message:: better error page
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1 /*
2  * Copyright (c) 2022 Omar Polo <op@omarpolo.com>
3  * Copyright (c) 2006 - 2015 Reyk Floeter <reyk@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <sys/types.h>
19 #include <sys/queue.h>
20 #include <sys/tree.h>
21 #include <sys/socket.h>
22 #include <sys/uio.h>
23 
24 #include <netinet/in.h>
25 #include <arpa/inet.h>
26 #include <netdb.h>
27 
28 #include <asr.h>
29 #include <ctype.h>
30 #include <errno.h>
31 #include <event.h>
32 #include <fnmatch.h>
33 #include <limits.h>
34 #include <stdlib.h>
35 #include <stdint.h>
36 #include <stdio.h>
37 #include <string.h>
38 #include <imsg.h>
39 #include <tls.h>
40 #include <unistd.h>
41 
42 #include "log.h"
43 #include "proc.h"
44 #include "tmpl.h"
45 
46 #include "galileo.h"
47 
48 #define MINIMUM(a, b)	((a) < (b) ? (a) : (b))
49 
50 /* provided by OpenBSD' base libevent but not in any header? */
51 extern void	 bufferevent_read_pressure_cb(struct evbuffer *, size_t,
52 		    size_t, void *);
53 
54 void	proxy_init(struct privsep *, struct privsep_proc *, void *);
55 int	proxy_launch(struct galileo *);
56 void	proxy_inflight_dec(const char *);
57 int	proxy_dispatch_parent(int, struct privsep_proc *, struct imsg *);
58 void	proxy_translate_gemtext(struct client *);
59 void	proxy_resolved(struct asr_result *, void *);
60 void	proxy_connect(int, short, void *);
61 int	proxy_start_reply(struct client *, int, const char *);
62 void	proxy_read(struct bufferevent *, void *);
63 void	proxy_write(struct bufferevent *, void *);
64 void	proxy_error(struct bufferevent *, short, void *);
65 int	proxy_bufferevent_add(struct event *, int);
66 void	proxy_tls_writecb(int, short, void *);
67 void	proxy_tls_readcb(int, short, void *);
68 
69 static struct privsep_proc procs[] = {
70 	{ "parent",	PROC_PARENT, proxy_dispatch_parent },
71 };
72 
73 volatile int proxy_clients;
74 volatile int proxy_inflight;
75 uint32_t proxy_fcg_id;
76 
77 void
78 proxy(struct privsep *ps, struct privsep_proc *p)
79 {
80 	proc_run(ps, p, procs, nitems(procs), proxy_init, NULL);
81 }
82 
83 void
84 proxy_init(struct privsep *ps, struct privsep_proc *p, void *arg)
85 {
86 	if (config_init(ps->ps_env) == -1)
87 		fatal("failed to initialize configuration");
88 
89 	/* We use a custom shutdown callback */
90 	/* p->p_shutdown = proxy_shutdown */
91 
92 	if (pledge("stdio recvfd unix inet dns", NULL) == -1)
93 		fatal("pledge");
94 }
95 
96 int
97 proxy_launch(struct galileo *env)
98 {
99 	event_add(&env->sc_evsock, NULL);
100 	return (0);
101 }
102 
103 void
104 proxy_purge(struct server *srv)
105 {
106 }
107 
108 void
109 proxy_inflight_dec(const char *why)
110 {
111 	proxy_inflight--;
112 	log_debug("%s: inflight decremented, now %d, %s",
113 	    __func__, proxy_inflight, why);
114 }
115 
116 int
117 proxy_dispatch_parent(int fd, struct privsep_proc *p, struct imsg *imsg)
118 {
119 	struct privsep	*ps = p->p_ps;
120 	struct galileo	*env = ps->ps_env;
121 
122 	switch (imsg->hdr.type) {
123 	case IMSG_CFG_SRV:
124 		if (config_getserver(env, imsg) == -1)
125 			fatal("config_getproxy");
126 		break;
127 	case IMSG_CFG_SOCK:
128 		/* XXX: improve */
129 
130 		if (env->sc_sock_fd != -1) {
131 			event_del(&env->sc_evsock);
132 			close(env->sc_sock_fd);
133 		}
134 
135 		env->sc_sock_fd = config_getsock(env, imsg);
136 		if (env->sc_sock_fd == -1)
137 			fatal("config_getsock");
138 
139 		event_set(&env->sc_evsock, env->sc_sock_fd,
140 		    EV_READ | EV_PERSIST, fcgi_accept, env);
141 		event_add(&env->sc_evsock, NULL);
142 		evtimer_set(&env->sc_evpause, fcgi_accept, env);
143 		break;
144 	case IMSG_CFG_DONE:
145 		log_debug("config done!");
146 		break;
147 	case IMSG_CTL_START:
148 		proxy_launch(env);
149 		break;
150 	default:
151 		log_warnx("unknown message %d", imsg->hdr.type);
152 		return (-1);
153 	}
154 
155 	return (0);
156 }
157 
158 static int
159 gemtext_translate_line(struct client *clt, char *line)
160 {
161 	/* preformatted line / closing */
162 	if (clt->clt_translate & TR_PRE) {
163 		if (!strncmp(line, "```", 3)) {
164 			clt->clt_translate &= ~TR_PRE;
165 			return (clt_puts(clt, "</pre>"));
166 		}
167 
168 		if (tp_htmlescape(clt->clt_tp, line) == -1)
169 			return (-1);
170 		return (clt_putc(clt, '\n'));
171 	}
172 
173 	/* bullet */
174 	if (!strncmp(line, "* ", 2)) {
175 		if (clt->clt_translate & TR_NAV) {
176 			if (clt_puts(clt, "</ul></nav>") == -1)
177 				return (-1);
178 			clt->clt_translate &= ~TR_NAV;
179 		}
180 
181 		if (!(clt->clt_translate & TR_LIST)) {
182 			if (clt_puts(clt, "<ul>") == -1)
183 				return (-1);
184 			clt->clt_translate |= TR_LIST;
185 		}
186 
187 		if (clt_puts(clt, "<li>") == -1 ||
188 		    tp_htmlescape(clt->clt_tp, line + 2) == -1 ||
189 		    clt_puts(clt, "</li>") == -1)
190 			return (-1);
191 		return (0);
192 	}
193 
194 	if (clt->clt_translate & TR_LIST) {
195 		if (clt_puts(clt, "</ul>") == -1)
196 			return (-1);
197 		clt->clt_translate &= ~TR_LIST;
198 	}
199 
200 	/* link -- TODO: relativify from SCRIPT_NAME */
201 	if (!strncmp(line, "=>", 2)) {
202 		char *label;
203 
204 		line += 2;
205 		line += strspn(line, " \t");
206 
207 		label = line + strcspn(line, " \t");
208 		if (*label == '\0')
209 			label = line;
210 		else
211 			*label++ = '\0';
212 
213 		if (fnmatch("*.jpg", line, 0) == 0 ||
214 		    fnmatch("*.jpeg", line, 0) == 0 ||
215 		    fnmatch("*.gif", line, 0) == 0 ||
216 		    fnmatch("*.png", line, 0) == 0 ||
217 		    fnmatch("*.svg", line, 0) == 0 ||
218 		    fnmatch("*.webp", line, 0) == 0) {
219 			if (clt->clt_translate & TR_NAV) {
220 				if (clt_puts(clt, "</ul></nav>") == -1)
221 					return (-1);
222 				clt->clt_translate &= ~TR_NAV;
223 			}
224 
225 			if (tp_figure(clt->clt_tp, line, label) == -1)
226 				return (-1);
227 
228 			return (0);
229 		}
230 
231 		if (!(clt->clt_translate & TR_NAV)) {
232 			if (clt_puts(clt, "<nav><ul>") == -1)
233 				return (-1);
234 			clt->clt_translate |= TR_NAV;
235 		}
236 
237 		if (clt_puts(clt, "<li><a href='") == -1)
238 			return (-1);
239 
240 		/* XXX: do proper parsing */
241 		if (*line == '/' || strstr(line, "//") == NULL) {
242 			if (tp_urlescape(clt->clt_tp,
243 			    clt->clt_script_name) == -1)
244 				return (-1);
245 
246 			/* skip the first / */
247 			line++;
248 		}
249 
250 		if (tp_urlescape(clt->clt_tp, line) == -1 ||
251 		    clt_puts(clt, "'>") == -1 ||
252 		    tp_htmlescape(clt->clt_tp, label) == -1 ||
253 		    clt_puts(clt, "</a></li>") == -1)
254 			return (-1);
255 
256 		return (0);
257 	}
258 
259 	if (clt->clt_translate & TR_NAV) {
260 		if (clt_puts(clt, "</ul></nav>") == -1)
261 			return (-1);
262 		clt->clt_translate &= ~TR_NAV;
263 	}
264 
265 	/* pre opening */
266 	if (!strncmp(line, "```", 3)) {
267 		clt->clt_translate |= TR_PRE;
268 		return (clt_puts(clt, "<pre>"));
269 	}
270 
271 	/* citation block */
272 	if (*line == '>') {
273 		if (clt_puts(clt, "<blockquote>") == -1 ||
274 		    tp_htmlescape(clt->clt_tp, line + 1) == -1 ||
275 		    clt_puts(clt, "</blockquote>") == -1)
276 			return (-1);
277 		return (0);
278 	}
279 
280 	/* headings */
281 	if (!strncmp(line, "###", 3)) {
282 		if (clt_puts(clt, "<h3>") == -1 ||
283 		    tp_htmlescape(clt->clt_tp, line + 3) == -1 ||
284 		    clt_puts(clt, "</h3>") == -1)
285 			return (-1);
286 		return (0);
287 	}
288 	if (!strncmp(line, "##", 2)) {
289 		if (clt_puts(clt, "<h2>") == -1 ||
290 		    tp_htmlescape(clt->clt_tp, line + 2) == -1 ||
291 		    clt_puts(clt, "</h2>") == -1)
292 			return (-1);
293 		return (0);
294 	}
295 	if (!strncmp(line, "#", 1)) {
296 		if (clt_puts(clt, "<h1>") == -1 ||
297 		    tp_htmlescape(clt->clt_tp, line + 1) == -1 ||
298 		    clt_puts(clt, "</h1>") == -1)
299 			return (-1);
300 		return (0);
301 	}
302 
303 	/* Not following strictly the gemini specification... */
304 	if (*line == '\0')
305 		return (0);
306 
307 	/* paragraph */
308 	if (clt_puts(clt, "<p>") == -1 ||
309 	    tp_htmlescape(clt->clt_tp, line) == -1 ||
310 	    clt_puts(clt, "</p>") == -1)
311 		return (-1);
312 
313 	return (0);
314 }
315 
316 void
317 proxy_translate_gemtext(struct client *clt)
318 {
319 	struct bufferevent	*bev = clt->clt_bev;
320 	struct evbuffer		*src = EVBUFFER_INPUT(bev);
321 	char			*line;
322 	size_t			 len;
323 	int			 r;
324 
325 	for (;;) {
326 		line = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF);
327 		if (line == NULL)
328 			return;
329 
330 		r = gemtext_translate_line(clt, line);
331 		free(line);
332 		if (r == -1)
333 			return;
334 	}
335 }
336 
337 static struct proxy_config *
338 proxy_server_match(struct galileo *env, struct client *clt)
339 {
340 	struct server		*srv;
341 
342 	if (clt->clt_server_name == NULL)
343 		return NULL;
344 
345 	TAILQ_FOREACH(srv, &env->sc_servers, srv_entry) {
346 		if (!strcmp(clt->clt_server_name, srv->srv_conf.host))
347 			return &srv->srv_conf;
348 	}
349 
350 	return NULL;
351 }
352 
353 void
354 proxy_start_request(struct galileo *env, struct client *clt)
355 {
356 	struct addrinfo		 hints;
357 	struct asr_query	*query;
358 	char			 port[32];
359 
360 	if ((clt->clt_pc = proxy_server_match(env, clt)) == NULL) {
361 		if (proxy_start_reply(clt, 501, "text/html") == -1)
362 			return;
363 		if (tp_error(clt->clt_tp, -1, "unknown server") == -1)
364 			return;
365 		fcgi_end_request(clt, 1);
366 		return;
367 	}
368 
369 	(void)snprintf(port, sizeof(port), "%d", clt->clt_pc->proxy_port);
370 
371 	memset(&hints, 0, sizeof(hints));
372 	hints.ai_family = AF_UNSPEC;
373 	hints.ai_socktype = SOCK_STREAM;
374 
375 	query = getaddrinfo_async(clt->clt_pc->proxy_addr, port, &hints, NULL);
376 	if (query == NULL) {
377 		log_warn("getaddrinfo_async");
378 		fcgi_abort_request(clt);
379 		return;
380 	}
381 
382 	clt->clt_evasr = event_asr_run(query, proxy_resolved, clt);
383 	if (clt->clt_evasr == NULL) {
384 		log_warn("event_asr_run");
385 		asr_abort(query);
386 		fcgi_abort_request(clt);
387 		return;
388 	}
389 }
390 
391 void
392 proxy_resolved(struct asr_result *res, void *d)
393 {
394 	struct client		*clt = d;
395 	struct proxy_config	*pc = clt->clt_pc;
396 
397 	clt->clt_evasr = NULL;
398 
399 	if (res->ar_gai_errno != 0) {
400 		log_warnx("failed to resolve %s:%d: %s",
401 		    pc->proxy_addr, pc->proxy_port,
402 		    gai_strerror(res->ar_gai_errno));
403 		if (proxy_start_reply(clt, 501, "text/html") == -1)
404 			return;
405 		if (tp_error(clt->clt_tp, -1, "Can't resolve host") == -1)
406 			return;
407 		fcgi_end_request(clt, 1);
408 		return;
409 	}
410 
411 	clt->clt_addrinfo = res->ar_addrinfo;
412 	clt->clt_p = clt->clt_addrinfo;
413 	proxy_connect(-1, 0, clt);
414 }
415 
416 void
417 proxy_connect(int fd, short ev, void *d)
418 {
419 	struct client		*clt = d;
420 	struct evbuffer		*out;
421 	struct addrinfo		*p;
422 	struct tls_config	*conf;
423 	struct timeval		 conntv = {5, 0};
424 	int			 err = 0;
425 	socklen_t		 len = sizeof(err);
426 
427 again:
428 	if (clt->clt_p == NULL)
429 		goto err;
430 
431 	if (clt->clt_fd != -1) {
432 		if (getsockopt(clt->clt_fd, SOL_SOCKET, SO_ERROR, &err, &len)
433 		    == -1)
434 			goto err;
435 		if (err != 0) {
436 			errno = err;
437 			goto err;
438 		}
439 		goto done;
440 	}
441 
442 	p = clt->clt_p;
443 	clt->clt_fd = socket(p->ai_family, p->ai_socktype | SOCK_NONBLOCK,
444 	    p->ai_protocol);
445 	if (clt->clt_fd == -1) {
446 		clt->clt_p = clt->clt_p->ai_next;
447 		goto again;
448 	}
449 
450 	if (connect(clt->clt_fd, p->ai_addr, p->ai_addrlen) == 0)
451 		goto done;
452 
453 	clt->clt_evconn_live = 1;
454 	event_set(&clt->clt_evconn, clt->clt_fd, EV_WRITE, proxy_connect, clt);
455 	event_add(&clt->clt_evconn, &conntv);
456 	return;
457 
458 done:
459 	clt->clt_evconn_live = 0;
460 	freeaddrinfo(clt->clt_addrinfo);
461 	clt->clt_addrinfo = clt->clt_p = NULL;
462 
463 	/* initialize TLS for Gemini */
464 	if ((conf = tls_config_new()) == NULL) {
465 		log_warn("tls_config_new failed");
466 		goto err;
467 	}
468 
469 	tls_config_insecure_noverifycert(conf);
470 
471 	if ((clt->clt_ctx = tls_client()) == NULL) {
472 		log_warnx("tls_client failed");
473 		tls_config_free(conf);
474 		goto err;
475 	}
476 
477 	if (tls_configure(clt->clt_ctx, conf) == -1) {
478 		log_warnx("tls_configure failed");
479 		tls_config_free(conf);
480 		goto err;
481 	}
482 
483 	tls_config_free(conf);
484 
485 	if (tls_connect_socket(clt->clt_ctx, clt->clt_fd,
486 	    clt->clt_pc->proxy_name) == -1) {
487 		log_warnx("tls_connect_socket failed");
488 		goto err;
489 	}
490 
491 	clt->clt_bev = bufferevent_new(clt->clt_fd, proxy_read, proxy_write,
492 	    proxy_error, clt);
493 	if (clt->clt_bev == NULL) {
494 		log_warn("bufferevent_new");
495 		goto err;
496 	}
497 	out = EVBUFFER_OUTPUT(clt->clt_bev);
498 
499 	event_set(&clt->clt_bev->ev_read, clt->clt_fd, EV_READ,
500 	    proxy_tls_readcb, clt->clt_bev);
501 	event_set(&clt->clt_bev->ev_write, clt->clt_fd, EV_WRITE,
502 	    proxy_tls_writecb, clt->clt_bev);
503 
504 	/* bufferevent_settimeout(); */
505 	bufferevent_enable(clt->clt_bev, EV_READ|EV_WRITE);
506 
507 	/* TODO: compute the URL */
508 	if (evbuffer_add_printf(out, "gemini://%s/%s\r\n",
509 	    clt->clt_pc->proxy_name, clt->clt_path_info) == -1) {
510 		log_warn("bufferevent_printf failed");
511 		goto err;
512 	}
513 
514 	return;
515 
516 err:
517 	log_warn("failed to connect to %s:%d",
518 	    clt->clt_pc->proxy_addr, clt->clt_pc->proxy_port);
519 	if (proxy_start_reply(clt, 501, "text/html") == -1)
520 		return;
521 	if (tp_error(clt->clt_tp, -1, "Can't connect") == -1)
522 		return;
523 	fcgi_end_request(clt, 1);
524 }
525 
526 static inline int
527 parse_mime(struct client *clt, char *mime, char *lang, size_t len)
528 {
529 	char			*t, *semi;
530 
531 	if (strncmp(mime, "text/gemini", 11) != 0)
532 		return (0);
533 
534 	clt->clt_translate = TR_ENABLED;
535 
536 	if ((mime = strchr(mime, ';')) == NULL)
537 		return (0);
538 
539 	*mime++ = '\0';
540 	while ((t = strsep(&mime, ";")) != NULL) {
541 		if (!strncmp(t, "charset=", 8)) {
542 			t += 8;
543 			if (!strncasecmp(t, "utf8", 4) ||
544 			    !strncasecmp(t, "utf-8", 5) ||
545 			    !strncasecmp(t, "ascii", 5)) {
546 				log_debug("unknown charset %s", t);
547 				return (-1);
548 			}
549 			continue;
550 		}
551 
552 		if (!strncmp(t, "lang=", 5)) {
553 			t += 5;
554 			if ((semi = strchr(t, ';')) != NULL)
555 				*semi = '\0';
556 
557 			if (strlcpy(lang, t, len) >= len) {
558 				log_debug("lang too long: %s", t);
559 				*lang = '\0';
560 			}
561 
562 			if (semi)
563 				*semi = ';';
564 			continue;
565 		}
566 	}
567 
568 	return (0);
569 }
570 
571 int
572 proxy_start_reply(struct client *clt, int status, const char *ctype)
573 {
574 	const char	*csp;
575 
576 	csp = "Content-Security-Policy: default-src 'self'; "
577 	    "script-src 'none'; object-src 'none';\r\n";
578 
579 	if (ctype != NULL && !strcmp(ctype, "text/html"))
580 		ctype = "text/html;charset=utf-8";
581 
582 	if (status != 200 &&
583 	    clt_printf(clt, "Status: %d\r\n", status) == -1)
584 		return (-1);
585 
586 	if (ctype != NULL &&
587 	    clt_printf(clt, "Content-Type: %s\r\n", ctype) == -1)
588 		return (-1);
589 
590 	if (clt_puts(clt, csp) == -1)
591 		return (-1);
592 
593 	if (clt_puts(clt, "\r\n") == -1)
594 		return (-1);
595 
596 	return (0);
597 }
598 
599 void
600 proxy_read(struct bufferevent *bev, void *d)
601 {
602 	struct client		*clt = d;
603 	struct evbuffer		*src = EVBUFFER_INPUT(bev);
604 	const char		*ctype;
605 	char			 lang[16];
606 	char			*hdr, *mime;
607 	size_t			 len;
608 	int			 code;
609 
610 	if (clt->clt_headersdone) {
611 		if (clt->clt_translate)
612 			proxy_translate_gemtext(clt);
613 		else
614 			clt_write_bufferevent(clt, bev);
615 		return;
616 	}
617 
618 	hdr = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF_STRICT);
619 	if (hdr == NULL) {
620 		if (EVBUFFER_LENGTH(src) >= 1026)
621 			proxy_error(bev, EV_READ, clt);
622 		return;
623 	}
624 
625 	if (len < 4 ||
626 	    !isdigit((unsigned char)hdr[0]) ||
627 	    !isdigit((unsigned char)hdr[1]) ||
628 	    hdr[2] != ' ') {
629 		log_warnx("invalid ");
630 		proxy_error(bev, EV_READ, clt);
631 		goto err;
632 	}
633 
634 	code = (hdr[0] - '0') * 10 + (hdr[1] - '0');
635 
636 	switch (hdr[0]) {
637 	case '2':
638 		/* handled below */
639 		break;
640 	default:
641 		if (proxy_start_reply(clt, 501, "text/html") == -1)
642 			goto err;
643 		if (tp_error(clt->clt_tp, code, &hdr[3]) == -1)
644 			goto err;
645 		fcgi_end_request(clt, 1);
646 		goto err;
647 	}
648 
649 	mime = hdr + 2 + strspn(hdr + 2, " \t");
650 	if (parse_mime(clt, mime, lang, sizeof(lang)) == -1) {
651 		if (proxy_start_reply(clt, 501, "text/html") == -1)
652 			goto err;
653 		if (tp_error(clt->clt_tp, -1, "Bad response") == -1)
654 			goto err;
655 		fcgi_end_request(clt, 1);
656 		goto err;
657 	}
658 
659 	if (clt->clt_translate)
660 		ctype = "text/html;charset=utf-8";
661 	else
662 		ctype = mime;
663 
664 	if (clt_printf(clt, "Content-Type: %s\r\n\r\n", ctype) == -1)
665 		goto err;
666 
667 	clt->clt_headersdone = 1;
668 
669 	if (clt->clt_translate &&
670 	    tp_head(clt->clt_tp, lang, NULL) == -1)
671 		goto err;
672 
673 	/*
674 	 * Trigger the read again so we proceed with the response
675 	 * body, if any.
676 	 */
677 	free(hdr);
678 	proxy_read(bev, d);
679 	return;
680 
681 err:
682 	free(hdr);
683 }
684 
685 void
686 proxy_write(struct bufferevent *bev, void *d)
687 {
688 	return;
689 }
690 
691 void
692 proxy_error(struct bufferevent *bev, short err, void *d)
693 {
694 	struct client		*clt = d;
695 	int			 status = !(err & EVBUFFER_EOF);
696 
697 	log_debug("proxy error, shutting down the connection (err: %x)",
698 	    err);
699 
700 	if (!clt->clt_headersdone) {
701 		if (proxy_start_reply(clt, 501, "text/html") == -1)
702 			return;
703 		if (tp_error(clt->clt_tp, -1, "Proxy error") == -1)
704 			return;
705 	} else if (status == 0) {
706 		if (clt->clt_translate & TR_PRE) {
707 			if (clt_puts(clt, "</pre>"))
708 				return;
709 			clt->clt_translate &= ~TR_PRE;
710 		}
711 
712 		if (clt->clt_translate & TR_LIST) {
713 			if (clt_puts(clt, "</ul>") == -1)
714 				return;
715 			clt->clt_translate &= ~TR_LIST;
716 		}
717 
718 		if (clt->clt_translate & TR_NAV) {
719 			if (clt_puts(clt, "</ul></nav>") == -1)
720 				return;
721 			clt->clt_translate &= ~TR_NAV;
722 		}
723 
724 		if (clt->clt_translate &&
725 		    tp_foot(clt->clt_tp) == -1)
726 			return;
727 	}
728 
729 	fcgi_end_request(clt, status);
730 }
731 
732 void
733 proxy_tls_readcb(int fd, short event, void *arg)
734 {
735 	struct bufferevent	*bufev = arg;
736 	struct client		*clt = bufev->cbarg;
737 	char			 rbuf[IBUF_READ_SIZE];
738 	int			 what = EVBUFFER_READ;
739 	int			 howmuch = IBUF_READ_SIZE;
740 	ssize_t			 ret;
741 	size_t			 len;
742 
743 	if (event == EV_TIMEOUT) {
744 		what |= EVBUFFER_TIMEOUT;
745 		goto err;
746 	}
747 
748 	if (bufev->wm_read.high != 0)
749 		howmuch = MINIMUM(sizeof(rbuf), bufev->wm_read.high);
750 
751 	ret = tls_read(clt->clt_ctx, rbuf, howmuch);
752 	if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) {
753 		goto retry;
754 	} else if (ret == -1) {
755 		what |= EVBUFFER_ERROR;
756 		goto err;
757 	}
758 	len = ret;
759 
760 	if (len == 0) {
761 		what |= EVBUFFER_EOF;
762 		goto err;
763 	}
764 
765 	if (evbuffer_add(bufev->input, rbuf, len) == -1) {
766 		what |= EVBUFFER_ERROR;
767 		goto err;
768 	}
769 
770 	proxy_bufferevent_add(&bufev->ev_read, bufev->timeout_read);
771 
772 	len = EVBUFFER_LENGTH(bufev->input);
773 	if (bufev->wm_read.low != 0 && len < bufev->wm_read.low)
774 		return;
775 	if (bufev->wm_read.high != 0 && len > bufev->wm_read.high) {
776 		struct evbuffer *buf = bufev->input;
777 		event_del(&bufev->ev_read);
778 		evbuffer_setcb(buf, bufferevent_read_pressure_cb, bufev);
779 		return;
780 	}
781 
782 	if (bufev->readcb != NULL)
783 		(*bufev->readcb)(bufev, bufev->cbarg);
784 	return;
785 
786 retry:
787 	proxy_bufferevent_add(&bufev->ev_read, bufev->timeout_read);
788 	return;
789 
790 err:
791 	(*bufev->errorcb)(bufev, what, bufev->cbarg);
792 }
793 
794 int
795 proxy_bufferevent_add(struct event *ev, int timeout)
796 {
797 	struct timeval tv, *ptv = NULL;
798 
799 	if (timeout) {
800 		timerclear(&tv);
801 		tv.tv_sec = timeout;
802 		ptv = &tv;
803 	}
804 
805 	return (event_add(ev, ptv));
806 }
807 
808 void
809 proxy_tls_writecb(int fd, short event, void *arg)
810 {
811 	struct bufferevent	*bufev = arg;
812 	struct client		*clt = bufev->cbarg;
813 	ssize_t			 ret;
814 	short			 what = EVBUFFER_WRITE;
815 	size_t			 len;
816 
817 	if (event == EV_TIMEOUT) {
818 		what |= EVBUFFER_TIMEOUT;
819 		goto err;
820 	}
821 
822 	if (EVBUFFER_LENGTH(bufev->output)) {
823 		ret = tls_write(clt->clt_ctx,
824 		    EVBUFFER_DATA(bufev->output),
825 		    EVBUFFER_LENGTH(bufev->output));
826 		if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) {
827 			goto retry;
828 		} else if (ret == -1) {
829 			what |= EVBUFFER_ERROR;
830 			goto err;
831 		}
832 		len = ret;
833 		evbuffer_drain(bufev->output, len);
834 	}
835 
836 	if (EVBUFFER_LENGTH(bufev->output) != 0)
837 		proxy_bufferevent_add(&bufev->ev_write, bufev->timeout_write);
838 
839 	if (bufev->writecb != NULL &&
840 	    EVBUFFER_LENGTH(bufev->output) <= bufev->wm_write.low)
841 		(*bufev->writecb)(bufev, bufev->cbarg);
842 	return;
843 
844 retry:
845 	proxy_bufferevent_add(&bufev->ev_write, bufev->timeout_write);
846 	return;
847 
848 err:
849 	(*bufev->errorcb)(bufev, what, bufev->cbarg);
850 }
851 
852 void
853 proxy_client_free(struct client *clt)
854 {
855 	if (clt->clt_evasr)
856 		event_asr_abort(clt->clt_evasr);
857 
858 	if (clt->clt_addrinfo)
859 		freeaddrinfo(clt->clt_addrinfo);
860 
861 	if (clt->clt_evconn_live)
862 		event_del(&clt->clt_evconn);
863 
864 	if (clt->clt_fd != -1)
865 		close(clt->clt_fd);
866 
867 	if (clt->clt_ctx)
868 		tls_free(clt->clt_ctx);
869 
870 	if (clt->clt_bev)
871 		bufferevent_free(clt->clt_bev);
872 
873 	free(clt->clt_tp);
874 	free(clt->clt_server_name);
875 	free(clt->clt_script_name);
876 	free(clt->clt_path_info);
877 	free(clt);
878 }