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Date:: Fri Sep 23 13:09:32 2022 UTC
Message:: change proxy_match to get a string
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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 proxy *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_getproxy(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 struct proxy_config *
338 proxy_match(struct galileo *env, const char *name)
339 {
340 	struct proxy		*pr;
341 
342 	if (name == NULL)
343 		return NULL;
344 
345 	TAILQ_FOREACH(pr, &env->sc_proxies, pr_entry) {
346 		if (!strcmp(name, pr->pr_conf.host))
347 			return &pr->pr_conf;
348 	}
349 
350 	return NULL;
351 }
352 
353 int
354 proxy_start_request(struct galileo *env, struct client *clt)
355 {
356 	struct addrinfo		 hints;
357 	struct asr_query	*query;
358 	int			 r;
359 	char			*url;
360 
361 	if ((clt->clt_pc = proxy_match(env, clt->clt_server_name)) == NULL) {
362 		if (proxy_start_reply(clt, 501, "text/html") == -1)
363 			return (-1);
364 		if (tp_error(clt->clt_tp, -1, "unknown server") == -1)
365 			return (-1);
366 		return (fcgi_end_request(clt, 1));
367 	}
368 
369 	if (clt->clt_bodylen != 0 && clt->clt_body == NULL) {
370 		if (proxy_start_reply(clt, 400, "text/html") == -1)
371 			return (-1);
372 		if (tp_error(clt->clt_tp, -1, "bad request") == -1)
373 			return (-1);
374 		return (fcgi_end_request(clt, 1));
375 	}
376 
377 	if (clt->clt_body) {
378 		r = asprintf(&url, "%s%s?%s", clt->clt_script_name,
379 		    clt->clt_path_info + 1, clt->clt_body);
380 		if (r == -1)
381 			return (fcgi_end_request(clt, 1));
382 
383 		if (proxy_start_reply(clt, 302, url) == -1 ||
384 		    fcgi_end_request(clt, 1) == -1) {
385 			free(url);
386 			return (-1);
387 		}
388 		free(url);
389 		return (0);
390 	}
391 
392 	memset(&hints, 0, sizeof(hints));
393 	hints.ai_family = AF_UNSPEC;
394 	hints.ai_socktype = SOCK_STREAM;
395 
396 	query = getaddrinfo_async(clt->clt_pc->proxy_addr,
397 	    clt->clt_pc->proxy_port, &hints, NULL);
398 	if (query == NULL) {
399 		log_warn("getaddrinfo_async");
400 		return (fcgi_abort_request(clt));
401 	}
402 
403 	clt->clt_evasr = event_asr_run(query, proxy_resolved, clt);
404 	if (clt->clt_evasr == NULL) {
405 		log_warn("event_asr_run");
406 		asr_abort(query);
407 		return (fcgi_abort_request(clt));
408 	}
409 
410 	return (0);
411 }
412 
413 void
414 proxy_resolved(struct asr_result *res, void *d)
415 {
416 	struct client		*clt = d;
417 	struct proxy_config	*pc = clt->clt_pc;
418 
419 	clt->clt_evasr = NULL;
420 
421 	if (res->ar_gai_errno != 0) {
422 		log_warnx("failed to resolve %s:%s: %s",
423 		    pc->proxy_addr, pc->proxy_port,
424 		    gai_strerror(res->ar_gai_errno));
425 		if (proxy_start_reply(clt, 501, "text/html") == -1)
426 			return;
427 		if (tp_error(clt->clt_tp, -1, "Can't resolve host") == -1)
428 			return;
429 		fcgi_end_request(clt, 1);
430 		return;
431 	}
432 
433 	clt->clt_addrinfo = res->ar_addrinfo;
434 	clt->clt_p = clt->clt_addrinfo;
435 	proxy_connect(-1, 0, clt);
436 }
437 
438 void
439 proxy_connect(int fd, short ev, void *d)
440 {
441 	struct client		*clt = d;
442 	struct evbuffer		*out;
443 	struct addrinfo		*p;
444 	struct tls_config	*conf;
445 	struct timeval		 conntv = {5, 0};
446 	int			 err = 0;
447 	socklen_t		 len = sizeof(err);
448 
449 again:
450 	if (clt->clt_p == NULL)
451 		goto err;
452 
453 	if (clt->clt_fd != -1) {
454 		if (getsockopt(clt->clt_fd, SOL_SOCKET, SO_ERROR, &err, &len)
455 		    == -1)
456 			goto err;
457 		if (err != 0) {
458 			errno = err;
459 			goto err;
460 		}
461 		goto done;
462 	}
463 
464 	p = clt->clt_p;
465 	clt->clt_fd = socket(p->ai_family, p->ai_socktype | SOCK_NONBLOCK,
466 	    p->ai_protocol);
467 	if (clt->clt_fd == -1) {
468 		clt->clt_p = clt->clt_p->ai_next;
469 		goto again;
470 	}
471 
472 	if (connect(clt->clt_fd, p->ai_addr, p->ai_addrlen) == 0)
473 		goto done;
474 
475 	clt->clt_evconn_live = 1;
476 	event_set(&clt->clt_evconn, clt->clt_fd, EV_WRITE, proxy_connect, clt);
477 	event_add(&clt->clt_evconn, &conntv);
478 	return;
479 
480 done:
481 	clt->clt_evconn_live = 0;
482 	freeaddrinfo(clt->clt_addrinfo);
483 	clt->clt_addrinfo = clt->clt_p = NULL;
484 
485 	/* initialize TLS for Gemini */
486 	if ((conf = tls_config_new()) == NULL) {
487 		log_warn("tls_config_new failed");
488 		goto err;
489 	}
490 
491 	tls_config_insecure_noverifycert(conf);
492 
493 	if ((clt->clt_ctx = tls_client()) == NULL) {
494 		log_warnx("tls_client failed");
495 		tls_config_free(conf);
496 		goto err;
497 	}
498 
499 	if (tls_configure(clt->clt_ctx, conf) == -1) {
500 		log_warnx("tls_configure failed");
501 		tls_config_free(conf);
502 		goto err;
503 	}
504 
505 	tls_config_free(conf);
506 
507 	if (tls_connect_socket(clt->clt_ctx, clt->clt_fd,
508 	    clt->clt_pc->proxy_name) == -1) {
509 		log_warnx("tls_connect_socket failed");
510 		goto err;
511 	}
512 
513 	clt->clt_bev = bufferevent_new(clt->clt_fd, proxy_read, proxy_write,
514 	    proxy_error, clt);
515 	if (clt->clt_bev == NULL) {
516 		log_warn("bufferevent_new");
517 		goto err;
518 	}
519 	out = EVBUFFER_OUTPUT(clt->clt_bev);
520 
521 	event_set(&clt->clt_bev->ev_read, clt->clt_fd, EV_READ,
522 	    proxy_tls_readcb, clt->clt_bev);
523 	event_set(&clt->clt_bev->ev_write, clt->clt_fd, EV_WRITE,
524 	    proxy_tls_writecb, clt->clt_bev);
525 
526 	/* bufferevent_settimeout(); */
527 	bufferevent_enable(clt->clt_bev, EV_READ|EV_WRITE);
528 
529 	/* TODO: compute the URL */
530 	if (evbuffer_add_printf(out, "gemini://%s/%s",
531 	    clt->clt_pc->proxy_name, clt->clt_path_info) == -1) {
532 		log_warn("bufferevent_printf failed");
533 		goto err;
534 	}
535 
536 	if (clt->clt_query &&
537 	    evbuffer_add_printf(out, "?%s", clt->clt_query) == -1) {
538 		log_warn("bufferevent_printf failed");
539 		goto err;
540 	}
541 
542 	if (evbuffer_add(out, "\r\n", 2) == -1) {
543 		log_warn("bufferevent_add failed");
544 		goto err;
545 	}
546 
547 	return;
548 
549 err:
550 	log_warn("failed to connect to %s:%s",
551 	    clt->clt_pc->proxy_addr, clt->clt_pc->proxy_port);
552 	if (proxy_start_reply(clt, 501, "text/html") == -1)
553 		return;
554 	if (tp_error(clt->clt_tp, -1, "Can't connect") == -1)
555 		return;
556 	fcgi_end_request(clt, 1);
557 }
558 
559 static inline int
560 parse_mime(struct client *clt, char *mime, char *lang, size_t len)
561 {
562 	char			*t, *semi;
563 
564 	if (strncmp(mime, "text/gemini", 11) != 0)
565 		return (0);
566 
567 	clt->clt_translate = TR_ENABLED;
568 
569 	if ((mime = strchr(mime, ';')) == NULL)
570 		return (0);
571 
572 	*mime++ = '\0';
573 	while ((t = strsep(&mime, ";")) != NULL) {
574 		if (!strncmp(t, "charset=", 8)) {
575 			t += 8;
576 			if (!strncasecmp(t, "utf8", 4) ||
577 			    !strncasecmp(t, "utf-8", 5) ||
578 			    !strncasecmp(t, "ascii", 5)) {
579 				log_debug("unknown charset %s", t);
580 				return (-1);
581 			}
582 			continue;
583 		}
584 
585 		if (!strncmp(t, "lang=", 5)) {
586 			t += 5;
587 			if ((semi = strchr(t, ';')) != NULL)
588 				*semi = '\0';
589 
590 			if (strlcpy(lang, t, len) >= len) {
591 				log_debug("lang too long: %s", t);
592 				*lang = '\0';
593 			}
594 
595 			if (semi)
596 				*semi = ';';
597 			continue;
598 		}
599 	}
600 
601 	return (0);
602 }
603 
604 int
605 proxy_start_reply(struct client *clt, int status, const char *ctype)
606 {
607 	const char	*csp;
608 
609 	csp = "Content-Security-Policy: default-src 'self'; "
610 	    "script-src 'none'; object-src 'none';\r\n";
611 
612 	if (status != 200 &&
613 	    clt_printf(clt, "Status: %d\r\n", status) == -1)
614 		return (-1);
615 
616 	if (clt_puts(clt, csp) == -1)
617 		return (-1);
618 
619 	if (status == 302) {
620 		/* use "ctype" as redirect target */
621 		if (clt_printf(clt, "Location: %s\r\n", ctype) == -1)
622 			return (-1);
623 		if (clt_puts(clt, "\r\n") == -1)
624 			return (-1);
625 		return (0);
626 	}
627 
628 	if (ctype != NULL) {
629 		if (!strcmp(ctype, "text/html"))
630 			ctype = "text/html;charset=utf-8";
631 		if (clt_printf(clt, "Content-Type: %s\r\n", ctype)
632 		    == -1)
633 			return (-1);
634 	}
635 
636 	if (clt_puts(clt, "\r\n") == -1)
637 		return (-1);
638 
639 	return (0);
640 }
641 
642 void
643 proxy_read(struct bufferevent *bev, void *d)
644 {
645 	struct client		*clt = d;
646 	struct evbuffer		*src = EVBUFFER_INPUT(bev);
647 	const char		*ctype;
648 	char			 lang[16];
649 	char			*hdr, *mime;
650 	size_t			 len;
651 	int			 code;
652 
653 	if (clt->clt_headersdone) {
654 		if (clt->clt_translate)
655 			proxy_translate_gemtext(clt);
656 		else
657 			clt_write_bufferevent(clt, bev);
658 		return;
659 	}
660 
661 	hdr = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF_STRICT);
662 	if (hdr == NULL) {
663 		if (EVBUFFER_LENGTH(src) >= 1026)
664 			proxy_error(bev, EV_READ, clt);
665 		return;
666 	}
667 
668 	if (len < 4 ||
669 	    !isdigit((unsigned char)hdr[0]) ||
670 	    !isdigit((unsigned char)hdr[1]) ||
671 	    hdr[2] != ' ') {
672 		log_warnx("invalid ");
673 		proxy_error(bev, EV_READ, clt);
674 		goto err;
675 	}
676 
677 	code = (hdr[0] - '0') * 10 + (hdr[1] - '0');
678 
679 	switch (hdr[0]) {
680 	case '1':
681 		if (proxy_start_reply(clt, 200, "text/html") == -1)
682 			goto err;
683 		if (tp_inputpage(clt->clt_tp, &hdr[3]) == -1)
684 			goto err;
685 		fcgi_end_request(clt, 0);
686 		goto err;
687 	case '2':
688 		/* handled below */
689 		break;
690 	case '3':
691 		/* XXX: do proper parsing */
692 		if (hdr[3] == '/' || strstr(&hdr[3], "//") == NULL) {
693 			char *url;
694 
695 			if (asprintf(&url, "%s%s", clt->clt_script_name,
696 			    &hdr[3]) == -1)
697 				goto err;
698 
699 			if (proxy_start_reply(clt, 302, url)) {
700 				free(url);
701 				goto err;
702 			}
703 			free(url);
704 			fcgi_end_request(clt, 0);
705 			goto err;
706 		}
707 		/* fallback */
708 	default:
709 		if (proxy_start_reply(clt, 501, "text/html") == -1)
710 			goto err;
711 		if (tp_error(clt->clt_tp, code, &hdr[3]) == -1)
712 			goto err;
713 		fcgi_end_request(clt, 1);
714 		goto err;
715 	}
716 
717 	mime = hdr + 2 + strspn(hdr + 2, " \t");
718 	if (parse_mime(clt, mime, lang, sizeof(lang)) == -1) {
719 		if (proxy_start_reply(clt, 501, "text/html") == -1)
720 			goto err;
721 		if (tp_error(clt->clt_tp, -1, "Bad response") == -1)
722 			goto err;
723 		fcgi_end_request(clt, 1);
724 		goto err;
725 	}
726 
727 	if (clt->clt_translate)
728 		ctype = "text/html;charset=utf-8";
729 	else
730 		ctype = mime;
731 
732 	if (clt_printf(clt, "Content-Type: %s\r\n\r\n", ctype) == -1)
733 		goto err;
734 
735 	clt->clt_headersdone = 1;
736 
737 	if (clt->clt_translate &&
738 	    tp_head(clt->clt_tp, lang, NULL) == -1)
739 		goto err;
740 
741 	/*
742 	 * Trigger the read again so we proceed with the response
743 	 * body, if any.
744 	 */
745 	free(hdr);
746 	proxy_read(bev, d);
747 	return;
748 
749 err:
750 	free(hdr);
751 }
752 
753 void
754 proxy_write(struct bufferevent *bev, void *d)
755 {
756 	return;
757 }
758 
759 void
760 proxy_error(struct bufferevent *bev, short err, void *d)
761 {
762 	struct client		*clt = d;
763 	int			 status = !(err & EVBUFFER_EOF);
764 
765 	log_debug("proxy error, shutting down the connection (err: %x)",
766 	    err);
767 
768 	if (!clt->clt_headersdone) {
769 		if (proxy_start_reply(clt, 501, "text/html") == -1)
770 			return;
771 		if (tp_error(clt->clt_tp, -1, "Proxy error") == -1)
772 			return;
773 	} else if (status == 0) {
774 		if (clt->clt_translate & TR_PRE) {
775 			if (clt_puts(clt, "</pre>"))
776 				return;
777 			clt->clt_translate &= ~TR_PRE;
778 		}
779 
780 		if (clt->clt_translate & TR_LIST) {
781 			if (clt_puts(clt, "</ul>") == -1)
782 				return;
783 			clt->clt_translate &= ~TR_LIST;
784 		}
785 
786 		if (clt->clt_translate & TR_NAV) {
787 			if (clt_puts(clt, "</ul></nav>") == -1)
788 				return;
789 			clt->clt_translate &= ~TR_NAV;
790 		}
791 
792 		if (clt->clt_translate &&
793 		    tp_foot(clt->clt_tp) == -1)
794 			return;
795 	}
796 
797 	fcgi_end_request(clt, status);
798 }
799 
800 void
801 proxy_tls_readcb(int fd, short event, void *arg)
802 {
803 	struct bufferevent	*bufev = arg;
804 	struct client		*clt = bufev->cbarg;
805 	char			 rbuf[IBUF_READ_SIZE];
806 	int			 what = EVBUFFER_READ;
807 	int			 howmuch = IBUF_READ_SIZE;
808 	ssize_t			 ret;
809 	size_t			 len;
810 
811 	if (event == EV_TIMEOUT) {
812 		what |= EVBUFFER_TIMEOUT;
813 		goto err;
814 	}
815 
816 	if (bufev->wm_read.high != 0)
817 		howmuch = MINIMUM(sizeof(rbuf), bufev->wm_read.high);
818 
819 	ret = tls_read(clt->clt_ctx, rbuf, howmuch);
820 	if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) {
821 		goto retry;
822 	} else if (ret == -1) {
823 		what |= EVBUFFER_ERROR;
824 		goto err;
825 	}
826 	len = ret;
827 
828 	if (len == 0) {
829 		what |= EVBUFFER_EOF;
830 		goto err;
831 	}
832 
833 	if (evbuffer_add(bufev->input, rbuf, len) == -1) {
834 		what |= EVBUFFER_ERROR;
835 		goto err;
836 	}
837 
838 	proxy_bufferevent_add(&bufev->ev_read, bufev->timeout_read);
839 
840 	len = EVBUFFER_LENGTH(bufev->input);
841 	if (bufev->wm_read.low != 0 && len < bufev->wm_read.low)
842 		return;
843 	if (bufev->wm_read.high != 0 && len > bufev->wm_read.high) {
844 		struct evbuffer *buf = bufev->input;
845 		event_del(&bufev->ev_read);
846 		evbuffer_setcb(buf, bufferevent_read_pressure_cb, bufev);
847 		return;
848 	}
849 
850 	if (bufev->readcb != NULL)
851 		(*bufev->readcb)(bufev, bufev->cbarg);
852 	return;
853 
854 retry:
855 	proxy_bufferevent_add(&bufev->ev_read, bufev->timeout_read);
856 	return;
857 
858 err:
859 	(*bufev->errorcb)(bufev, what, bufev->cbarg);
860 }
861 
862 int
863 proxy_bufferevent_add(struct event *ev, int timeout)
864 {
865 	struct timeval tv, *ptv = NULL;
866 
867 	if (timeout) {
868 		timerclear(&tv);
869 		tv.tv_sec = timeout;
870 		ptv = &tv;
871 	}
872 
873 	return (event_add(ev, ptv));
874 }
875 
876 void
877 proxy_tls_writecb(int fd, short event, void *arg)
878 {
879 	struct bufferevent	*bufev = arg;
880 	struct client		*clt = bufev->cbarg;
881 	ssize_t			 ret;
882 	short			 what = EVBUFFER_WRITE;
883 	size_t			 len;
884 
885 	if (event == EV_TIMEOUT) {
886 		what |= EVBUFFER_TIMEOUT;
887 		goto err;
888 	}
889 
890 	if (EVBUFFER_LENGTH(bufev->output)) {
891 		ret = tls_write(clt->clt_ctx,
892 		    EVBUFFER_DATA(bufev->output),
893 		    EVBUFFER_LENGTH(bufev->output));
894 		if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) {
895 			goto retry;
896 		} else if (ret == -1) {
897 			what |= EVBUFFER_ERROR;
898 			goto err;
899 		}
900 		len = ret;
901 		evbuffer_drain(bufev->output, len);
902 	}
903 
904 	if (EVBUFFER_LENGTH(bufev->output) != 0)
905 		proxy_bufferevent_add(&bufev->ev_write, bufev->timeout_write);
906 
907 	if (bufev->writecb != NULL &&
908 	    EVBUFFER_LENGTH(bufev->output) <= bufev->wm_write.low)
909 		(*bufev->writecb)(bufev, bufev->cbarg);
910 	return;
911 
912 retry:
913 	proxy_bufferevent_add(&bufev->ev_write, bufev->timeout_write);
914 	return;
915 
916 err:
917 	(*bufev->errorcb)(bufev, what, bufev->cbarg);
918 }
919 
920 void
921 proxy_client_free(struct client *clt)
922 {
923 	if (clt->clt_evasr)
924 		event_asr_abort(clt->clt_evasr);
925 
926 	if (clt->clt_addrinfo)
927 		freeaddrinfo(clt->clt_addrinfo);
928 
929 	if (clt->clt_evconn_live)
930 		event_del(&clt->clt_evconn);
931 
932 	if (clt->clt_fd != -1)
933 		close(clt->clt_fd);
934 
935 	if (clt->clt_ctx)
936 		tls_free(clt->clt_ctx);
937 
938 	if (clt->clt_bev)
939 		bufferevent_free(clt->clt_bev);
940 
941 	free(clt->clt_body);
942 	free(clt->clt_tp);
943 	free(clt->clt_server_name);
944 	free(clt->clt_script_name);
945 	free(clt->clt_path_info);
946 	free(clt->clt_query);
947 	free(clt);
948 }