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Date:: Sun Sep 25 22:13:16 2022 UTC
Message:: use /* fallthrough */ to please the compiler
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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 "config.h"
43 #include "log.h"
44 #include "proc.h"
45 #include "tmpl.h"
46 
47 #include "galileo.h"
48 
49 #define MINIMUM(a, b)	((a) < (b) ? (a) : (b))
50 
51 #if HAVE_LIBEVENT2
52 # define G_TOUT(t)	((t).tv_sec)
53 #else
54 # define G_TOUT(t)	(t)
55 #endif
56 
57 /* provided by OpenBSD' base libevent but not in any header? */
58 extern void	 bufferevent_read_pressure_cb(struct evbuffer *, size_t,
59 		    size_t, void *);
60 
61 void	proxy_init(struct privsep *, struct privsep_proc *, void *);
62 int	proxy_launch(struct galileo *);
63 void	proxy_inflight_dec(const char *);
64 int	proxy_dispatch_parent(int, struct privsep_proc *, struct imsg *);
65 void	proxy_translate_gemtext(struct client *);
66 void	proxy_resolved(struct asr_result *, void *);
67 void	proxy_connect(int, short, void *);
68 int	proxy_start_reply(struct client *, int, const char *);
69 void	proxy_read(struct bufferevent *, void *);
70 void	proxy_write(struct bufferevent *, void *);
71 void	proxy_error(struct bufferevent *, short, void *);
72 int	proxy_bufferevent_add(struct event *, int);
73 void	proxy_tls_writecb(int, short, void *);
74 void	proxy_tls_readcb(int, short, void *);
75 
76 static struct privsep_proc procs[] = {
77 	{ "parent",	PROC_PARENT, proxy_dispatch_parent },
78 };
79 
80 volatile int proxy_clients;
81 volatile int proxy_inflight;
82 uint32_t proxy_fcg_id;
83 
84 void
85 proxy(struct privsep *ps, struct privsep_proc *p)
86 {
87 	proc_run(ps, p, procs, nitems(procs), proxy_init, NULL);
88 }
89 
90 void
91 proxy_init(struct privsep *ps, struct privsep_proc *p, void *arg)
92 {
93 	if (config_init(ps->ps_env) == -1)
94 		fatal("failed to initialize configuration");
95 
96 	/* We use a custom shutdown callback */
97 	/* p->p_shutdown = proxy_shutdown */
98 
99 	if (pledge("stdio recvfd unix inet dns", NULL) == -1)
100 		fatal("pledge");
101 }
102 
103 int
104 proxy_launch(struct galileo *env)
105 {
106 	event_add(&env->sc_evsock, NULL);
107 	return (0);
108 }
109 
110 void
111 proxy_purge(struct proxy *pr)
112 {
113 	free(pr);
114 }
115 
116 void
117 proxy_inflight_dec(const char *why)
118 {
119 	proxy_inflight--;
120 	log_debug("%s: inflight decremented, now %d, %s",
121 	    __func__, proxy_inflight, why);
122 }
123 
124 int
125 proxy_dispatch_parent(int fd, struct privsep_proc *p, struct imsg *imsg)
126 {
127 	struct privsep	*ps = p->p_ps;
128 	struct galileo	*env = ps->ps_env;
129 
130 	switch (imsg->hdr.type) {
131 	case IMSG_CFG_SRV:
132 		if (config_getproxy(env, imsg) == -1)
133 			fatal("config_getproxy");
134 		break;
135 	case IMSG_CFG_SOCK:
136 		/* XXX: improve */
137 
138 		env->sc_sock_fd = config_getsock(env, imsg);
139 		if (env->sc_sock_fd == -1)
140 			fatal("config_getsock");
141 
142 		event_set(&env->sc_evsock, env->sc_sock_fd,
143 		    EV_READ | EV_PERSIST, fcgi_accept, env);
144 		evtimer_set(&env->sc_evpause, fcgi_accept, env);
145 		break;
146 	case IMSG_CFG_DONE:
147 		config_getcfg(env, imsg);
148 		proxy_launch(env);
149 		break;
150 	case IMSG_CTL_START:
151 		break;
152 	case IMSG_CTL_RESET:
153 		config_getreset(env, imsg);
154 		break;
155 	default:
156 		return (-1);
157 	}
158 
159 	return (0);
160 }
161 
162 static int
163 gemtext_translate_line(struct client *clt, char *line)
164 {
165 	/* preformatted line / closing */
166 	if (clt->clt_translate & TR_PRE) {
167 		if (!strncmp(line, "```", 3)) {
168 			clt->clt_translate &= ~TR_PRE;
169 			return (clt_puts(clt, "</pre>"));
170 		}
171 
172 		if (tp_htmlescape(clt->clt_tp, line) == -1)
173 			return (-1);
174 		return (clt_putc(clt, '\n'));
175 	}
176 
177 	/* bullet */
178 	if (!strncmp(line, "* ", 2)) {
179 		if (clt->clt_translate & TR_NAV) {
180 			if (clt_puts(clt, "</ul></nav>") == -1)
181 				return (-1);
182 			clt->clt_translate &= ~TR_NAV;
183 		}
184 
185 		if (!(clt->clt_translate & TR_LIST)) {
186 			if (clt_puts(clt, "<ul>") == -1)
187 				return (-1);
188 			clt->clt_translate |= TR_LIST;
189 		}
190 
191 		if (clt_puts(clt, "<li>") == -1 ||
192 		    tp_htmlescape(clt->clt_tp, line + 2) == -1 ||
193 		    clt_puts(clt, "</li>") == -1)
194 			return (-1);
195 		return (0);
196 	}
197 
198 	if (clt->clt_translate & TR_LIST) {
199 		if (clt_puts(clt, "</ul>") == -1)
200 			return (-1);
201 		clt->clt_translate &= ~TR_LIST;
202 	}
203 
204 	/* link -- TODO: relativify from SCRIPT_NAME */
205 	if (!strncmp(line, "=>", 2)) {
206 		char *label;
207 
208 		line += 2;
209 		line += strspn(line, " \t");
210 
211 		label = line + strcspn(line, " \t");
212 		if (*label == '\0')
213 			label = line;
214 		else
215 			*label++ = '\0';
216 
217 		if (fnmatch("*.jpg", line, 0) == 0 ||
218 		    fnmatch("*.jpeg", line, 0) == 0 ||
219 		    fnmatch("*.gif", line, 0) == 0 ||
220 		    fnmatch("*.png", line, 0) == 0 ||
221 		    fnmatch("*.svg", line, 0) == 0 ||
222 		    fnmatch("*.webp", line, 0) == 0) {
223 			if (clt->clt_translate & TR_NAV) {
224 				if (clt_puts(clt, "</ul></nav>") == -1)
225 					return (-1);
226 				clt->clt_translate &= ~TR_NAV;
227 			}
228 
229 			if (tp_figure(clt->clt_tp, line, label) == -1)
230 				return (-1);
231 
232 			return (0);
233 		}
234 
235 		if (!(clt->clt_translate & TR_NAV)) {
236 			if (clt_puts(clt, "<nav><ul>") == -1)
237 				return (-1);
238 			clt->clt_translate |= TR_NAV;
239 		}
240 
241 		if (clt_puts(clt, "<li><a href='") == -1)
242 			return (-1);
243 
244 		/* XXX: do proper parsing */
245 		if (*line == '/' || strstr(line, "//") == NULL) {
246 			if (tp_urlescape(clt->clt_tp,
247 			    clt->clt_script_name) == -1)
248 				return (-1);
249 
250 			/* skip the first / */
251 			line++;
252 		}
253 
254 		if (tp_urlescape(clt->clt_tp, line) == -1 ||
255 		    clt_puts(clt, "'>") == -1 ||
256 		    tp_htmlescape(clt->clt_tp, label) == -1 ||
257 		    clt_puts(clt, "</a></li>") == -1)
258 			return (-1);
259 
260 		return (0);
261 	}
262 
263 	if (clt->clt_translate & TR_NAV) {
264 		if (clt_puts(clt, "</ul></nav>") == -1)
265 			return (-1);
266 		clt->clt_translate &= ~TR_NAV;
267 	}
268 
269 	/* pre opening */
270 	if (!strncmp(line, "```", 3)) {
271 		clt->clt_translate |= TR_PRE;
272 		return (clt_puts(clt, "<pre>"));
273 	}
274 
275 	/* citation block */
276 	if (*line == '>') {
277 		if (clt_puts(clt, "<blockquote>") == -1 ||
278 		    tp_htmlescape(clt->clt_tp, line + 1) == -1 ||
279 		    clt_puts(clt, "</blockquote>") == -1)
280 			return (-1);
281 		return (0);
282 	}
283 
284 	/* headings */
285 	if (!strncmp(line, "###", 3)) {
286 		if (clt_puts(clt, "<h3>") == -1 ||
287 		    tp_htmlescape(clt->clt_tp, line + 3) == -1 ||
288 		    clt_puts(clt, "</h3>") == -1)
289 			return (-1);
290 		return (0);
291 	}
292 	if (!strncmp(line, "##", 2)) {
293 		if (clt_puts(clt, "<h2>") == -1 ||
294 		    tp_htmlescape(clt->clt_tp, line + 2) == -1 ||
295 		    clt_puts(clt, "</h2>") == -1)
296 			return (-1);
297 		return (0);
298 	}
299 	if (!strncmp(line, "#", 1)) {
300 		if (clt_puts(clt, "<h1>") == -1 ||
301 		    tp_htmlescape(clt->clt_tp, line + 1) == -1 ||
302 		    clt_puts(clt, "</h1>") == -1)
303 			return (-1);
304 		return (0);
305 	}
306 
307 	/* Not following strictly the gemini specification... */
308 	if (*line == '\0')
309 		return (0);
310 
311 	/* paragraph */
312 	if (clt_puts(clt, "<p>") == -1 ||
313 	    tp_htmlescape(clt->clt_tp, line) == -1 ||
314 	    clt_puts(clt, "</p>") == -1)
315 		return (-1);
316 
317 	return (0);
318 }
319 
320 void
321 proxy_translate_gemtext(struct client *clt)
322 {
323 	struct bufferevent	*bev = clt->clt_bev;
324 	struct evbuffer		*src = EVBUFFER_INPUT(bev);
325 	char			*line;
326 	size_t			 len;
327 	int			 r;
328 
329 	for (;;) {
330 		line = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF);
331 		if (line == NULL)
332 			return;
333 
334 		r = gemtext_translate_line(clt, line);
335 		free(line);
336 		if (r == -1)
337 			return;
338 	}
339 }
340 
341 struct proxy_config *
342 proxy_match(struct galileo *env, const char *name)
343 {
344 	struct proxy		*pr;
345 
346 	if (name == NULL)
347 		return (NULL);
348 
349 	TAILQ_FOREACH(pr, &env->sc_proxies, pr_entry) {
350 		if (!strcmp(name, pr->pr_conf.host))
351 			return (&pr->pr_conf);
352 	}
353 
354 	return (NULL);
355 }
356 
357 int
358 proxy_start_request(struct galileo *env, struct client *clt)
359 {
360 	struct addrinfo		 hints;
361 	struct asr_query	*query;
362 	int			 r;
363 	char			*url;
364 
365 	if ((clt->clt_pc = proxy_match(env, clt->clt_server_name)) == NULL) {
366 		if (proxy_start_reply(clt, 501, "text/html") == -1)
367 			return (-1);
368 		if (tp_error(clt->clt_tp, -1, "unknown server") == -1)
369 			return (-1);
370 		return (fcgi_end_request(clt, 1));
371 	}
372 
373 	if (clt->clt_bodylen != 0 && clt->clt_body == NULL) {
374 		if (proxy_start_reply(clt, 400, "text/html") == -1)
375 			return (-1);
376 		if (tp_error(clt->clt_tp, -1, "bad request") == -1)
377 			return (-1);
378 		return (fcgi_end_request(clt, 1));
379 	}
380 
381 	if (clt->clt_body) {
382 		r = asprintf(&url, "%s%s?%s", clt->clt_script_name,
383 		    clt->clt_path_info + 1, clt->clt_body);
384 		if (r == -1)
385 			return (fcgi_end_request(clt, 1));
386 
387 		if (proxy_start_reply(clt, 302, url) == -1 ||
388 		    fcgi_end_request(clt, 1) == -1) {
389 			free(url);
390 			return (-1);
391 		}
392 		free(url);
393 		return (0);
394 	}
395 
396 	memset(&hints, 0, sizeof(hints));
397 	hints.ai_family = AF_UNSPEC;
398 	hints.ai_socktype = SOCK_STREAM;
399 
400 	query = getaddrinfo_async(clt->clt_pc->proxy_addr,
401 	    clt->clt_pc->proxy_port, &hints, NULL);
402 	if (query == NULL) {
403 		log_warn("getaddrinfo_async");
404 		return (fcgi_abort_request(clt));
405 	}
406 
407 	clt->clt_evasr = event_asr_run(query, proxy_resolved, clt);
408 	if (clt->clt_evasr == NULL) {
409 		log_warn("event_asr_run");
410 		asr_abort(query);
411 		return (fcgi_abort_request(clt));
412 	}
413 
414 	return (0);
415 }
416 
417 void
418 proxy_resolved(struct asr_result *res, void *d)
419 {
420 	struct client		*clt = d;
421 	struct proxy_config	*pc = clt->clt_pc;
422 
423 	clt->clt_evasr = NULL;
424 
425 	if (res->ar_gai_errno != 0) {
426 		log_warnx("failed to resolve %s:%s: %s",
427 		    pc->proxy_addr, pc->proxy_port,
428 		    gai_strerror(res->ar_gai_errno));
429 		if (proxy_start_reply(clt, 501, "text/html") == -1)
430 			return;
431 		if (tp_error(clt->clt_tp, -1, "Can't resolve host") == -1)
432 			return;
433 		fcgi_end_request(clt, 1);
434 		return;
435 	}
436 
437 	clt->clt_addrinfo = res->ar_addrinfo;
438 	clt->clt_p = clt->clt_addrinfo;
439 	proxy_connect(-1, 0, clt);
440 }
441 
442 void
443 proxy_connect(int fd, short ev, void *d)
444 {
445 	struct client		*clt = d;
446 	struct evbuffer		*out;
447 	struct addrinfo		*p;
448 	struct tls_config	*conf;
449 	struct timeval		 conntv = {5, 0};
450 	int			 err = 0;
451 	socklen_t		 len = sizeof(err);
452 
453 again:
454 	if (clt->clt_p == NULL)
455 		goto err;
456 
457 	if (clt->clt_fd != -1) {
458 		if (getsockopt(clt->clt_fd, SOL_SOCKET, SO_ERROR, &err, &len)
459 		    == -1)
460 			goto err;
461 		if (err != 0) {
462 			errno = err;
463 			goto err;
464 		}
465 		goto done;
466 	}
467 
468 	p = clt->clt_p;
469 	clt->clt_fd = socket(p->ai_family, p->ai_socktype | SOCK_NONBLOCK,
470 	    p->ai_protocol);
471 	if (clt->clt_fd == -1) {
472 		clt->clt_p = clt->clt_p->ai_next;
473 		goto again;
474 	}
475 
476 	if (connect(clt->clt_fd, p->ai_addr, p->ai_addrlen) == 0)
477 		goto done;
478 
479 	clt->clt_evconn_live = 1;
480 	event_set(&clt->clt_evconn, clt->clt_fd, EV_WRITE, proxy_connect, clt);
481 	event_add(&clt->clt_evconn, &conntv);
482 	return;
483 
484 done:
485 	clt->clt_evconn_live = 0;
486 	freeaddrinfo(clt->clt_addrinfo);
487 	clt->clt_addrinfo = clt->clt_p = NULL;
488 
489 	clt->clt_bev = bufferevent_new(clt->clt_fd, proxy_read, proxy_write,
490 	    proxy_error, clt);
491 	if (clt->clt_bev == NULL) {
492 		log_warn("bufferevent_new");
493 		goto err;
494 	}
495 
496 	if (!clt->clt_pc->no_tls) {
497 		/* initialize TLS for Gemini */
498 		if ((conf = tls_config_new()) == NULL) {
499 			log_warn("tls_config_new failed");
500 			goto err;
501 		}
502 
503 		tls_config_insecure_noverifycert(conf);
504 
505 		if ((clt->clt_ctx = tls_client()) == NULL) {
506 			log_warnx("tls_client failed");
507 			tls_config_free(conf);
508 			goto err;
509 		}
510 
511 		if (tls_configure(clt->clt_ctx, conf) == -1) {
512 			log_warnx("tls_configure failed");
513 			tls_config_free(conf);
514 			goto err;
515 		}
516 
517 		tls_config_free(conf);
518 
519 		if (tls_connect_socket(clt->clt_ctx, clt->clt_fd,
520 			clt->clt_pc->proxy_name) == -1) {
521 			log_warnx("tls_connect_socket failed");
522 			goto err;
523 		}
524 
525 		event_set(&clt->clt_bev->ev_read, clt->clt_fd, EV_READ,
526 		    proxy_tls_readcb, clt->clt_bev);
527 		event_set(&clt->clt_bev->ev_write, clt->clt_fd, EV_WRITE,
528 		    proxy_tls_writecb, clt->clt_bev);
529 
530 #if HAVE_LIBEVENT2
531 		evbuffer_unfreeze(clt->clt_bev->input, 0);
532 		evbuffer_unfreeze(clt->clt_bev->output, 1);
533 #endif
534 	}
535 
536 	/* bufferevent_settimeout(); */
537 	bufferevent_enable(clt->clt_bev, EV_READ|EV_WRITE);
538 
539 	/* TODO: compute the URL */
540 	out = EVBUFFER_OUTPUT(clt->clt_bev);
541 	if (evbuffer_add_printf(out, "gemini://%s/%s",
542 	    clt->clt_pc->proxy_name, clt->clt_path_info) == -1) {
543 		log_warn("bufferevent_printf failed");
544 		goto err;
545 	}
546 
547 	if (clt->clt_query &&
548 	    evbuffer_add_printf(out, "?%s", clt->clt_query) == -1) {
549 		log_warn("bufferevent_printf failed");
550 		goto err;
551 	}
552 
553 	if (evbuffer_add(out, "\r\n", 2) == -1) {
554 		log_warn("bufferevent_add failed");
555 		goto err;
556 	}
557 
558 	return;
559 
560 err:
561 	log_warn("failed to connect to %s:%s",
562 	    clt->clt_pc->proxy_addr, clt->clt_pc->proxy_port);
563 	if (proxy_start_reply(clt, 501, "text/html") == -1)
564 		return;
565 	if (tp_error(clt->clt_tp, -1, "Can't connect") == -1)
566 		return;
567 	fcgi_end_request(clt, 1);
568 }
569 
570 static inline int
571 parse_mime(struct client *clt, char *mime, char *lang, size_t len)
572 {
573 	char			*t, *semi;
574 
575 	if (strncmp(mime, "text/gemini", 11) != 0)
576 		return (0);
577 
578 	clt->clt_translate = TR_ENABLED;
579 
580 	if ((mime = strchr(mime, ';')) == NULL)
581 		return (0);
582 
583 	*mime++ = '\0';
584 	while ((t = strsep(&mime, ";")) != NULL) {
585 		if (!strncmp(t, "charset=", 8)) {
586 			t += 8;
587 			if (!strncasecmp(t, "utf8", 4) ||
588 			    !strncasecmp(t, "utf-8", 5) ||
589 			    !strncasecmp(t, "ascii", 5)) {
590 				log_debug("unknown charset %s", t);
591 				return (-1);
592 			}
593 			continue;
594 		}
595 
596 		if (!strncmp(t, "lang=", 5)) {
597 			t += 5;
598 			if ((semi = strchr(t, ';')) != NULL)
599 				*semi = '\0';
600 
601 			if (strlcpy(lang, t, len) >= len) {
602 				log_debug("lang too long: %s", t);
603 				*lang = '\0';
604 			}
605 
606 			if (semi)
607 				*semi = ';';
608 			continue;
609 		}
610 	}
611 
612 	return (0);
613 }
614 
615 int
616 proxy_start_reply(struct client *clt, int status, const char *ctype)
617 {
618 	const char	*csp;
619 
620 	csp = "Content-Security-Policy: default-src 'self'; "
621 	    "script-src 'none'; object-src 'none';\r\n";
622 
623 	if (status != 200 &&
624 	    clt_printf(clt, "Status: %d\r\n", status) == -1)
625 		return (-1);
626 
627 	if (clt_puts(clt, csp) == -1)
628 		return (-1);
629 
630 	if (status == 302) {
631 		/* use "ctype" as redirect target */
632 		if (clt_printf(clt, "Location: %s\r\n", ctype) == -1)
633 			return (-1);
634 		if (clt_puts(clt, "\r\n") == -1)
635 			return (-1);
636 		return (0);
637 	}
638 
639 	if (ctype != NULL) {
640 		if (!strcmp(ctype, "text/html"))
641 			ctype = "text/html;charset=utf-8";
642 		if (clt_printf(clt, "Content-Type: %s\r\n", ctype)
643 		    == -1)
644 			return (-1);
645 	}
646 
647 	if (clt_puts(clt, "\r\n") == -1)
648 		return (-1);
649 
650 	return (0);
651 }
652 
653 void
654 proxy_read(struct bufferevent *bev, void *d)
655 {
656 	struct client		*clt = d;
657 	struct evbuffer		*src = EVBUFFER_INPUT(bev);
658 	const char		*ctype;
659 	char			 lang[16];
660 	char			*hdr, *mime;
661 	size_t			 len;
662 	int			 code;
663 
664 	if (clt->clt_headersdone) {
665 		if (clt->clt_translate)
666 			proxy_translate_gemtext(clt);
667 		else
668 			clt_write_bufferevent(clt, bev);
669 		return;
670 	}
671 
672 	hdr = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF_STRICT);
673 	if (hdr == NULL) {
674 		if (EVBUFFER_LENGTH(src) >= 1026)
675 			proxy_error(bev, EV_READ, clt);
676 		return;
677 	}
678 
679 	if (len < 4 ||
680 	    !isdigit((unsigned char)hdr[0]) ||
681 	    !isdigit((unsigned char)hdr[1]) ||
682 	    hdr[2] != ' ') {
683 		log_warnx("invalid ");
684 		proxy_error(bev, EV_READ, clt);
685 		goto err;
686 	}
687 
688 	code = (hdr[0] - '0') * 10 + (hdr[1] - '0');
689 
690 	switch (hdr[0]) {
691 	case '1':
692 		if (proxy_start_reply(clt, 200, "text/html") == -1)
693 			goto err;
694 		if (tp_inputpage(clt->clt_tp, &hdr[3]) == -1)
695 			goto err;
696 		fcgi_end_request(clt, 0);
697 		goto err;
698 	case '2':
699 		/* handled below */
700 		break;
701 	case '3':
702 		/* XXX: do proper parsing */
703 		if (hdr[3] == '/' || strstr(&hdr[3], "//") == NULL) {
704 			char *url;
705 
706 			if (asprintf(&url, "%s%s", clt->clt_script_name,
707 			    &hdr[3]) == -1)
708 				goto err;
709 
710 			if (proxy_start_reply(clt, 302, url)) {
711 				free(url);
712 				goto err;
713 			}
714 			free(url);
715 			fcgi_end_request(clt, 0);
716 			goto err;
717 		}
718 		/* fallthrough */
719 	default:
720 		if (proxy_start_reply(clt, 501, "text/html") == -1)
721 			goto err;
722 		if (tp_error(clt->clt_tp, code, &hdr[3]) == -1)
723 			goto err;
724 		fcgi_end_request(clt, 1);
725 		goto err;
726 	}
727 
728 	mime = hdr + 2 + strspn(hdr + 2, " \t");
729 	if (parse_mime(clt, mime, lang, sizeof(lang)) == -1) {
730 		if (proxy_start_reply(clt, 501, "text/html") == -1)
731 			goto err;
732 		if (tp_error(clt->clt_tp, -1, "Bad response") == -1)
733 			goto err;
734 		fcgi_end_request(clt, 1);
735 		goto err;
736 	}
737 
738 	if (clt->clt_translate)
739 		ctype = "text/html;charset=utf-8";
740 	else
741 		ctype = mime;
742 
743 	if (clt_printf(clt, "Content-Type: %s\r\n\r\n", ctype) == -1)
744 		goto err;
745 
746 	clt->clt_headersdone = 1;
747 
748 	if (clt->clt_translate &&
749 	    tp_head(clt->clt_tp, lang, NULL) == -1)
750 		goto err;
751 
752 	/*
753 	 * Trigger the read again so we proceed with the response
754 	 * body, if any.
755 	 */
756 	free(hdr);
757 	proxy_read(bev, d);
758 	return;
759 
760 err:
761 	free(hdr);
762 }
763 
764 void
765 proxy_write(struct bufferevent *bev, void *d)
766 {
767 	return;
768 }
769 
770 void
771 proxy_error(struct bufferevent *bev, short err, void *d)
772 {
773 	struct client		*clt = d;
774 	int			 status = !(err & EVBUFFER_EOF);
775 
776 	log_debug("proxy error, shutting down the connection (err: %x)",
777 	    err);
778 
779 	if (!clt->clt_headersdone) {
780 		if (proxy_start_reply(clt, 501, "text/html") == -1)
781 			return;
782 		if (tp_error(clt->clt_tp, -1, "Proxy error") == -1)
783 			return;
784 	} else if (status == 0) {
785 		if (clt->clt_translate & TR_PRE) {
786 			if (clt_puts(clt, "</pre>"))
787 				return;
788 			clt->clt_translate &= ~TR_PRE;
789 		}
790 
791 		if (clt->clt_translate & TR_LIST) {
792 			if (clt_puts(clt, "</ul>") == -1)
793 				return;
794 			clt->clt_translate &= ~TR_LIST;
795 		}
796 
797 		if (clt->clt_translate & TR_NAV) {
798 			if (clt_puts(clt, "</ul></nav>") == -1)
799 				return;
800 			clt->clt_translate &= ~TR_NAV;
801 		}
802 
803 		if (clt->clt_translate &&
804 		    tp_foot(clt->clt_tp) == -1)
805 			return;
806 	}
807 
808 	fcgi_end_request(clt, status);
809 }
810 
811 void
812 proxy_tls_readcb(int fd, short event, void *arg)
813 {
814 	struct bufferevent	*bufev = arg;
815 	struct client		*clt = bufev->cbarg;
816 	char			 rbuf[IBUF_READ_SIZE];
817 	int			 what = EVBUFFER_READ;
818 	int			 howmuch = IBUF_READ_SIZE;
819 	ssize_t			 ret;
820 	size_t			 len;
821 
822 	if (event == EV_TIMEOUT) {
823 		what |= EVBUFFER_TIMEOUT;
824 		goto err;
825 	}
826 
827 	if (bufev->wm_read.high != 0)
828 		howmuch = MINIMUM(sizeof(rbuf), bufev->wm_read.high);
829 
830 	ret = tls_read(clt->clt_ctx, rbuf, howmuch);
831 	if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) {
832 		goto retry;
833 	} else if (ret == -1) {
834 		what |= EVBUFFER_ERROR;
835 		goto err;
836 	}
837 	len = ret;
838 
839 	if (len == 0) {
840 		what |= EVBUFFER_EOF;
841 		goto err;
842 	}
843 
844 	if (evbuffer_add(bufev->input, rbuf, len) == -1) {
845 		what |= EVBUFFER_ERROR;
846 		goto err;
847 	}
848 
849 	proxy_bufferevent_add(&bufev->ev_read, G_TOUT(bufev->timeout_read));
850 
851 	len = EVBUFFER_LENGTH(bufev->input);
852 	if (bufev->wm_read.low != 0 && len < bufev->wm_read.low)
853 		return;
854 	if (bufev->wm_read.high != 0 && len > bufev->wm_read.high) {
855 		struct evbuffer *buf = bufev->input;
856 		event_del(&bufev->ev_read);
857 		evbuffer_setcb(buf, bufferevent_read_pressure_cb, bufev);
858 		return;
859 	}
860 
861 	if (bufev->readcb != NULL)
862 		(*bufev->readcb)(bufev, bufev->cbarg);
863 	return;
864 
865 retry:
866 	proxy_bufferevent_add(&bufev->ev_read, G_TOUT(bufev->timeout_read));
867 	return;
868 
869 err:
870 	(*bufev->errorcb)(bufev, what, bufev->cbarg);
871 }
872 
873 int
874 proxy_bufferevent_add(struct event *ev, int timeout)
875 {
876 	struct timeval tv, *ptv = NULL;
877 
878 	if (timeout) {
879 		timerclear(&tv);
880 		tv.tv_sec = timeout;
881 		ptv = &tv;
882 	}
883 
884 	return (event_add(ev, ptv));
885 }
886 
887 void
888 proxy_tls_writecb(int fd, short event, void *arg)
889 {
890 	struct bufferevent	*bufev = arg;
891 	struct client		*clt = bufev->cbarg;
892 	ssize_t			 ret;
893 	short			 what = EVBUFFER_WRITE;
894 	size_t			 len;
895 
896 	if (event == EV_TIMEOUT) {
897 		what |= EVBUFFER_TIMEOUT;
898 		goto err;
899 	}
900 
901 	if (EVBUFFER_LENGTH(bufev->output)) {
902 		ret = tls_write(clt->clt_ctx,
903 		    EVBUFFER_DATA(bufev->output),
904 		    EVBUFFER_LENGTH(bufev->output));
905 		if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) {
906 			goto retry;
907 		} else if (ret == -1) {
908 			what |= EVBUFFER_ERROR;
909 			goto err;
910 		}
911 		len = ret;
912 		evbuffer_drain(bufev->output, len);
913 	}
914 
915 	if (EVBUFFER_LENGTH(bufev->output) != 0)
916 		proxy_bufferevent_add(&bufev->ev_write,
917 		    G_TOUT(bufev->timeout_write));
918 
919 	if (bufev->writecb != NULL &&
920 	    EVBUFFER_LENGTH(bufev->output) <= bufev->wm_write.low)
921 		(*bufev->writecb)(bufev, bufev->cbarg);
922 	return;
923 
924 retry:
925 	proxy_bufferevent_add(&bufev->ev_write, G_TOUT(bufev->timeout_write));
926 	return;
927 
928 err:
929 	(*bufev->errorcb)(bufev, what, bufev->cbarg);
930 }
931 
932 void
933 proxy_client_free(struct client *clt)
934 {
935 	if (clt->clt_evasr)
936 		event_asr_abort(clt->clt_evasr);
937 
938 	if (clt->clt_addrinfo)
939 		freeaddrinfo(clt->clt_addrinfo);
940 
941 	if (clt->clt_evconn_live)
942 		event_del(&clt->clt_evconn);
943 
944 	if (clt->clt_fd != -1)
945 		close(clt->clt_fd);
946 
947 	if (clt->clt_ctx)
948 		tls_free(clt->clt_ctx);
949 
950 	if (clt->clt_bev)
951 		bufferevent_free(clt->clt_bev);
952 
953 	free(clt->clt_body);
954 	free(clt->clt_tp);
955 	free(clt->clt_server_name);
956 	free(clt->clt_script_name);
957 	free(clt->clt_path_info);
958 	free(clt->clt_query);
959 	free(clt);
960 }