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Date:: Fri Sep 23 14:38:53 2022 UTC
Message:: fix reconfiguration
Actions:: History | Blame | Raw File
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 *pr)
105 {
106 	free(pr);
107 }
108 
109 void
110 proxy_inflight_dec(const char *why)
111 {
112 	proxy_inflight--;
113 	log_debug("%s: inflight decremented, now %d, %s",
114 	    __func__, proxy_inflight, why);
115 }
116 
117 int
118 proxy_dispatch_parent(int fd, struct privsep_proc *p, struct imsg *imsg)
119 {
120 	struct privsep	*ps = p->p_ps;
121 	struct galileo	*env = ps->ps_env;
122 
123 	switch (imsg->hdr.type) {
124 	case IMSG_CFG_SRV:
125 		if (config_getproxy(env, imsg) == -1)
126 			fatal("config_getproxy");
127 		break;
128 	case IMSG_CFG_SOCK:
129 		/* XXX: improve */
130 
131 		env->sc_sock_fd = config_getsock(env, imsg);
132 		if (env->sc_sock_fd == -1)
133 			fatal("config_getsock");
134 
135 		event_set(&env->sc_evsock, env->sc_sock_fd,
136 		    EV_READ | EV_PERSIST, fcgi_accept, env);
137 		evtimer_set(&env->sc_evpause, fcgi_accept, env);
138 		break;
139 	case IMSG_CFG_DONE:
140 		config_getcfg(env, imsg);
141 		proxy_launch(env);
142 		break;
143 	case IMSG_CTL_START:
144 		break;
145 	case IMSG_CTL_RESET:
146 		config_getreset(env, imsg);
147 		break;
148 	default:
149 		return (-1);
150 	}
151 
152 	return (0);
153 }
154 
155 static int
156 gemtext_translate_line(struct client *clt, char *line)
157 {
158 	/* preformatted line / closing */
159 	if (clt->clt_translate & TR_PRE) {
160 		if (!strncmp(line, "```", 3)) {
161 			clt->clt_translate &= ~TR_PRE;
162 			return (clt_puts(clt, "</pre>"));
163 		}
164 
165 		if (tp_htmlescape(clt->clt_tp, line) == -1)
166 			return (-1);
167 		return (clt_putc(clt, '\n'));
168 	}
169 
170 	/* bullet */
171 	if (!strncmp(line, "* ", 2)) {
172 		if (clt->clt_translate & TR_NAV) {
173 			if (clt_puts(clt, "</ul></nav>") == -1)
174 				return (-1);
175 			clt->clt_translate &= ~TR_NAV;
176 		}
177 
178 		if (!(clt->clt_translate & TR_LIST)) {
179 			if (clt_puts(clt, "<ul>") == -1)
180 				return (-1);
181 			clt->clt_translate |= TR_LIST;
182 		}
183 
184 		if (clt_puts(clt, "<li>") == -1 ||
185 		    tp_htmlescape(clt->clt_tp, line + 2) == -1 ||
186 		    clt_puts(clt, "</li>") == -1)
187 			return (-1);
188 		return (0);
189 	}
190 
191 	if (clt->clt_translate & TR_LIST) {
192 		if (clt_puts(clt, "</ul>") == -1)
193 			return (-1);
194 		clt->clt_translate &= ~TR_LIST;
195 	}
196 
197 	/* link -- TODO: relativify from SCRIPT_NAME */
198 	if (!strncmp(line, "=>", 2)) {
199 		char *label;
200 
201 		line += 2;
202 		line += strspn(line, " \t");
203 
204 		label = line + strcspn(line, " \t");
205 		if (*label == '\0')
206 			label = line;
207 		else
208 			*label++ = '\0';
209 
210 		if (fnmatch("*.jpg", line, 0) == 0 ||
211 		    fnmatch("*.jpeg", line, 0) == 0 ||
212 		    fnmatch("*.gif", line, 0) == 0 ||
213 		    fnmatch("*.png", line, 0) == 0 ||
214 		    fnmatch("*.svg", line, 0) == 0 ||
215 		    fnmatch("*.webp", line, 0) == 0) {
216 			if (clt->clt_translate & TR_NAV) {
217 				if (clt_puts(clt, "</ul></nav>") == -1)
218 					return (-1);
219 				clt->clt_translate &= ~TR_NAV;
220 			}
221 
222 			if (tp_figure(clt->clt_tp, line, label) == -1)
223 				return (-1);
224 
225 			return (0);
226 		}
227 
228 		if (!(clt->clt_translate & TR_NAV)) {
229 			if (clt_puts(clt, "<nav><ul>") == -1)
230 				return (-1);
231 			clt->clt_translate |= TR_NAV;
232 		}
233 
234 		if (clt_puts(clt, "<li><a href='") == -1)
235 			return (-1);
236 
237 		/* XXX: do proper parsing */
238 		if (*line == '/' || strstr(line, "//") == NULL) {
239 			if (tp_urlescape(clt->clt_tp,
240 			    clt->clt_script_name) == -1)
241 				return (-1);
242 
243 			/* skip the first / */
244 			line++;
245 		}
246 
247 		if (tp_urlescape(clt->clt_tp, line) == -1 ||
248 		    clt_puts(clt, "'>") == -1 ||
249 		    tp_htmlescape(clt->clt_tp, label) == -1 ||
250 		    clt_puts(clt, "</a></li>") == -1)
251 			return (-1);
252 
253 		return (0);
254 	}
255 
256 	if (clt->clt_translate & TR_NAV) {
257 		if (clt_puts(clt, "</ul></nav>") == -1)
258 			return (-1);
259 		clt->clt_translate &= ~TR_NAV;
260 	}
261 
262 	/* pre opening */
263 	if (!strncmp(line, "```", 3)) {
264 		clt->clt_translate |= TR_PRE;
265 		return (clt_puts(clt, "<pre>"));
266 	}
267 
268 	/* citation block */
269 	if (*line == '>') {
270 		if (clt_puts(clt, "<blockquote>") == -1 ||
271 		    tp_htmlescape(clt->clt_tp, line + 1) == -1 ||
272 		    clt_puts(clt, "</blockquote>") == -1)
273 			return (-1);
274 		return (0);
275 	}
276 
277 	/* headings */
278 	if (!strncmp(line, "###", 3)) {
279 		if (clt_puts(clt, "<h3>") == -1 ||
280 		    tp_htmlescape(clt->clt_tp, line + 3) == -1 ||
281 		    clt_puts(clt, "</h3>") == -1)
282 			return (-1);
283 		return (0);
284 	}
285 	if (!strncmp(line, "##", 2)) {
286 		if (clt_puts(clt, "<h2>") == -1 ||
287 		    tp_htmlescape(clt->clt_tp, line + 2) == -1 ||
288 		    clt_puts(clt, "</h2>") == -1)
289 			return (-1);
290 		return (0);
291 	}
292 	if (!strncmp(line, "#", 1)) {
293 		if (clt_puts(clt, "<h1>") == -1 ||
294 		    tp_htmlescape(clt->clt_tp, line + 1) == -1 ||
295 		    clt_puts(clt, "</h1>") == -1)
296 			return (-1);
297 		return (0);
298 	}
299 
300 	/* Not following strictly the gemini specification... */
301 	if (*line == '\0')
302 		return (0);
303 
304 	/* paragraph */
305 	if (clt_puts(clt, "<p>") == -1 ||
306 	    tp_htmlescape(clt->clt_tp, line) == -1 ||
307 	    clt_puts(clt, "</p>") == -1)
308 		return (-1);
309 
310 	return (0);
311 }
312 
313 void
314 proxy_translate_gemtext(struct client *clt)
315 {
316 	struct bufferevent	*bev = clt->clt_bev;
317 	struct evbuffer		*src = EVBUFFER_INPUT(bev);
318 	char			*line;
319 	size_t			 len;
320 	int			 r;
321 
322 	for (;;) {
323 		line = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF);
324 		if (line == NULL)
325 			return;
326 
327 		r = gemtext_translate_line(clt, line);
328 		free(line);
329 		if (r == -1)
330 			return;
331 	}
332 }
333 
334 struct proxy_config *
335 proxy_match(struct galileo *env, const char *name)
336 {
337 	struct proxy		*pr;
338 
339 	if (name == NULL)
340 		return NULL;
341 
342 	TAILQ_FOREACH(pr, &env->sc_proxies, pr_entry) {
343 		if (!strcmp(name, pr->pr_conf.host))
344 			return &pr->pr_conf;
345 	}
346 
347 	return NULL;
348 }
349 
350 int
351 proxy_start_request(struct galileo *env, struct client *clt)
352 {
353 	struct addrinfo		 hints;
354 	struct asr_query	*query;
355 	int			 r;
356 	char			*url;
357 
358 	if ((clt->clt_pc = proxy_match(env, clt->clt_server_name)) == NULL) {
359 		if (proxy_start_reply(clt, 501, "text/html") == -1)
360 			return (-1);
361 		if (tp_error(clt->clt_tp, -1, "unknown server") == -1)
362 			return (-1);
363 		return (fcgi_end_request(clt, 1));
364 	}
365 
366 	if (clt->clt_bodylen != 0 && clt->clt_body == NULL) {
367 		if (proxy_start_reply(clt, 400, "text/html") == -1)
368 			return (-1);
369 		if (tp_error(clt->clt_tp, -1, "bad request") == -1)
370 			return (-1);
371 		return (fcgi_end_request(clt, 1));
372 	}
373 
374 	if (clt->clt_body) {
375 		r = asprintf(&url, "%s%s?%s", clt->clt_script_name,
376 		    clt->clt_path_info + 1, clt->clt_body);
377 		if (r == -1)
378 			return (fcgi_end_request(clt, 1));
379 
380 		if (proxy_start_reply(clt, 302, url) == -1 ||
381 		    fcgi_end_request(clt, 1) == -1) {
382 			free(url);
383 			return (-1);
384 		}
385 		free(url);
386 		return (0);
387 	}
388 
389 	memset(&hints, 0, sizeof(hints));
390 	hints.ai_family = AF_UNSPEC;
391 	hints.ai_socktype = SOCK_STREAM;
392 
393 	query = getaddrinfo_async(clt->clt_pc->proxy_addr,
394 	    clt->clt_pc->proxy_port, &hints, NULL);
395 	if (query == NULL) {
396 		log_warn("getaddrinfo_async");
397 		return (fcgi_abort_request(clt));
398 	}
399 
400 	clt->clt_evasr = event_asr_run(query, proxy_resolved, clt);
401 	if (clt->clt_evasr == NULL) {
402 		log_warn("event_asr_run");
403 		asr_abort(query);
404 		return (fcgi_abort_request(clt));
405 	}
406 
407 	return (0);
408 }
409 
410 void
411 proxy_resolved(struct asr_result *res, void *d)
412 {
413 	struct client		*clt = d;
414 	struct proxy_config	*pc = clt->clt_pc;
415 
416 	clt->clt_evasr = NULL;
417 
418 	if (res->ar_gai_errno != 0) {
419 		log_warnx("failed to resolve %s:%s: %s",
420 		    pc->proxy_addr, pc->proxy_port,
421 		    gai_strerror(res->ar_gai_errno));
422 		if (proxy_start_reply(clt, 501, "text/html") == -1)
423 			return;
424 		if (tp_error(clt->clt_tp, -1, "Can't resolve host") == -1)
425 			return;
426 		fcgi_end_request(clt, 1);
427 		return;
428 	}
429 
430 	clt->clt_addrinfo = res->ar_addrinfo;
431 	clt->clt_p = clt->clt_addrinfo;
432 	proxy_connect(-1, 0, clt);
433 }
434 
435 void
436 proxy_connect(int fd, short ev, void *d)
437 {
438 	struct client		*clt = d;
439 	struct evbuffer		*out;
440 	struct addrinfo		*p;
441 	struct tls_config	*conf;
442 	struct timeval		 conntv = {5, 0};
443 	int			 err = 0;
444 	socklen_t		 len = sizeof(err);
445 
446 again:
447 	if (clt->clt_p == NULL)
448 		goto err;
449 
450 	if (clt->clt_fd != -1) {
451 		if (getsockopt(clt->clt_fd, SOL_SOCKET, SO_ERROR, &err, &len)
452 		    == -1)
453 			goto err;
454 		if (err != 0) {
455 			errno = err;
456 			goto err;
457 		}
458 		goto done;
459 	}
460 
461 	p = clt->clt_p;
462 	clt->clt_fd = socket(p->ai_family, p->ai_socktype | SOCK_NONBLOCK,
463 	    p->ai_protocol);
464 	if (clt->clt_fd == -1) {
465 		clt->clt_p = clt->clt_p->ai_next;
466 		goto again;
467 	}
468 
469 	if (connect(clt->clt_fd, p->ai_addr, p->ai_addrlen) == 0)
470 		goto done;
471 
472 	clt->clt_evconn_live = 1;
473 	event_set(&clt->clt_evconn, clt->clt_fd, EV_WRITE, proxy_connect, clt);
474 	event_add(&clt->clt_evconn, &conntv);
475 	return;
476 
477 done:
478 	clt->clt_evconn_live = 0;
479 	freeaddrinfo(clt->clt_addrinfo);
480 	clt->clt_addrinfo = clt->clt_p = NULL;
481 
482 	/* initialize TLS for Gemini */
483 	if ((conf = tls_config_new()) == NULL) {
484 		log_warn("tls_config_new failed");
485 		goto err;
486 	}
487 
488 	tls_config_insecure_noverifycert(conf);
489 
490 	if ((clt->clt_ctx = tls_client()) == NULL) {
491 		log_warnx("tls_client failed");
492 		tls_config_free(conf);
493 		goto err;
494 	}
495 
496 	if (tls_configure(clt->clt_ctx, conf) == -1) {
497 		log_warnx("tls_configure failed");
498 		tls_config_free(conf);
499 		goto err;
500 	}
501 
502 	tls_config_free(conf);
503 
504 	if (tls_connect_socket(clt->clt_ctx, clt->clt_fd,
505 	    clt->clt_pc->proxy_name) == -1) {
506 		log_warnx("tls_connect_socket failed");
507 		goto err;
508 	}
509 
510 	clt->clt_bev = bufferevent_new(clt->clt_fd, proxy_read, proxy_write,
511 	    proxy_error, clt);
512 	if (clt->clt_bev == NULL) {
513 		log_warn("bufferevent_new");
514 		goto err;
515 	}
516 	out = EVBUFFER_OUTPUT(clt->clt_bev);
517 
518 	event_set(&clt->clt_bev->ev_read, clt->clt_fd, EV_READ,
519 	    proxy_tls_readcb, clt->clt_bev);
520 	event_set(&clt->clt_bev->ev_write, clt->clt_fd, EV_WRITE,
521 	    proxy_tls_writecb, clt->clt_bev);
522 
523 	/* bufferevent_settimeout(); */
524 	bufferevent_enable(clt->clt_bev, EV_READ|EV_WRITE);
525 
526 	/* TODO: compute the URL */
527 	if (evbuffer_add_printf(out, "gemini://%s/%s",
528 	    clt->clt_pc->proxy_name, clt->clt_path_info) == -1) {
529 		log_warn("bufferevent_printf failed");
530 		goto err;
531 	}
532 
533 	if (clt->clt_query &&
534 	    evbuffer_add_printf(out, "?%s", clt->clt_query) == -1) {
535 		log_warn("bufferevent_printf failed");
536 		goto err;
537 	}
538 
539 	if (evbuffer_add(out, "\r\n", 2) == -1) {
540 		log_warn("bufferevent_add failed");
541 		goto err;
542 	}
543 
544 	return;
545 
546 err:
547 	log_warn("failed to connect to %s:%s",
548 	    clt->clt_pc->proxy_addr, clt->clt_pc->proxy_port);
549 	if (proxy_start_reply(clt, 501, "text/html") == -1)
550 		return;
551 	if (tp_error(clt->clt_tp, -1, "Can't connect") == -1)
552 		return;
553 	fcgi_end_request(clt, 1);
554 }
555 
556 static inline int
557 parse_mime(struct client *clt, char *mime, char *lang, size_t len)
558 {
559 	char			*t, *semi;
560 
561 	if (strncmp(mime, "text/gemini", 11) != 0)
562 		return (0);
563 
564 	clt->clt_translate = TR_ENABLED;
565 
566 	if ((mime = strchr(mime, ';')) == NULL)
567 		return (0);
568 
569 	*mime++ = '\0';
570 	while ((t = strsep(&mime, ";")) != NULL) {
571 		if (!strncmp(t, "charset=", 8)) {
572 			t += 8;
573 			if (!strncasecmp(t, "utf8", 4) ||
574 			    !strncasecmp(t, "utf-8", 5) ||
575 			    !strncasecmp(t, "ascii", 5)) {
576 				log_debug("unknown charset %s", t);
577 				return (-1);
578 			}
579 			continue;
580 		}
581 
582 		if (!strncmp(t, "lang=", 5)) {
583 			t += 5;
584 			if ((semi = strchr(t, ';')) != NULL)
585 				*semi = '\0';
586 
587 			if (strlcpy(lang, t, len) >= len) {
588 				log_debug("lang too long: %s", t);
589 				*lang = '\0';
590 			}
591 
592 			if (semi)
593 				*semi = ';';
594 			continue;
595 		}
596 	}
597 
598 	return (0);
599 }
600 
601 int
602 proxy_start_reply(struct client *clt, int status, const char *ctype)
603 {
604 	const char	*csp;
605 
606 	csp = "Content-Security-Policy: default-src 'self'; "
607 	    "script-src 'none'; object-src 'none';\r\n";
608 
609 	if (status != 200 &&
610 	    clt_printf(clt, "Status: %d\r\n", status) == -1)
611 		return (-1);
612 
613 	if (clt_puts(clt, csp) == -1)
614 		return (-1);
615 
616 	if (status == 302) {
617 		/* use "ctype" as redirect target */
618 		if (clt_printf(clt, "Location: %s\r\n", ctype) == -1)
619 			return (-1);
620 		if (clt_puts(clt, "\r\n") == -1)
621 			return (-1);
622 		return (0);
623 	}
624 
625 	if (ctype != NULL) {
626 		if (!strcmp(ctype, "text/html"))
627 			ctype = "text/html;charset=utf-8";
628 		if (clt_printf(clt, "Content-Type: %s\r\n", ctype)
629 		    == -1)
630 			return (-1);
631 	}
632 
633 	if (clt_puts(clt, "\r\n") == -1)
634 		return (-1);
635 
636 	return (0);
637 }
638 
639 void
640 proxy_read(struct bufferevent *bev, void *d)
641 {
642 	struct client		*clt = d;
643 	struct evbuffer		*src = EVBUFFER_INPUT(bev);
644 	const char		*ctype;
645 	char			 lang[16];
646 	char			*hdr, *mime;
647 	size_t			 len;
648 	int			 code;
649 
650 	if (clt->clt_headersdone) {
651 		if (clt->clt_translate)
652 			proxy_translate_gemtext(clt);
653 		else
654 			clt_write_bufferevent(clt, bev);
655 		return;
656 	}
657 
658 	hdr = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF_STRICT);
659 	if (hdr == NULL) {
660 		if (EVBUFFER_LENGTH(src) >= 1026)
661 			proxy_error(bev, EV_READ, clt);
662 		return;
663 	}
664 
665 	if (len < 4 ||
666 	    !isdigit((unsigned char)hdr[0]) ||
667 	    !isdigit((unsigned char)hdr[1]) ||
668 	    hdr[2] != ' ') {
669 		log_warnx("invalid ");
670 		proxy_error(bev, EV_READ, clt);
671 		goto err;
672 	}
673 
674 	code = (hdr[0] - '0') * 10 + (hdr[1] - '0');
675 
676 	switch (hdr[0]) {
677 	case '1':
678 		if (proxy_start_reply(clt, 200, "text/html") == -1)
679 			goto err;
680 		if (tp_inputpage(clt->clt_tp, &hdr[3]) == -1)
681 			goto err;
682 		fcgi_end_request(clt, 0);
683 		goto err;
684 	case '2':
685 		/* handled below */
686 		break;
687 	case '3':
688 		/* XXX: do proper parsing */
689 		if (hdr[3] == '/' || strstr(&hdr[3], "//") == NULL) {
690 			char *url;
691 
692 			if (asprintf(&url, "%s%s", clt->clt_script_name,
693 			    &hdr[3]) == -1)
694 				goto err;
695 
696 			if (proxy_start_reply(clt, 302, url)) {
697 				free(url);
698 				goto err;
699 			}
700 			free(url);
701 			fcgi_end_request(clt, 0);
702 			goto err;
703 		}
704 		/* fallback */
705 	default:
706 		if (proxy_start_reply(clt, 501, "text/html") == -1)
707 			goto err;
708 		if (tp_error(clt->clt_tp, code, &hdr[3]) == -1)
709 			goto err;
710 		fcgi_end_request(clt, 1);
711 		goto err;
712 	}
713 
714 	mime = hdr + 2 + strspn(hdr + 2, " \t");
715 	if (parse_mime(clt, mime, lang, sizeof(lang)) == -1) {
716 		if (proxy_start_reply(clt, 501, "text/html") == -1)
717 			goto err;
718 		if (tp_error(clt->clt_tp, -1, "Bad response") == -1)
719 			goto err;
720 		fcgi_end_request(clt, 1);
721 		goto err;
722 	}
723 
724 	if (clt->clt_translate)
725 		ctype = "text/html;charset=utf-8";
726 	else
727 		ctype = mime;
728 
729 	if (clt_printf(clt, "Content-Type: %s\r\n\r\n", ctype) == -1)
730 		goto err;
731 
732 	clt->clt_headersdone = 1;
733 
734 	if (clt->clt_translate &&
735 	    tp_head(clt->clt_tp, lang, NULL) == -1)
736 		goto err;
737 
738 	/*
739 	 * Trigger the read again so we proceed with the response
740 	 * body, if any.
741 	 */
742 	free(hdr);
743 	proxy_read(bev, d);
744 	return;
745 
746 err:
747 	free(hdr);
748 }
749 
750 void
751 proxy_write(struct bufferevent *bev, void *d)
752 {
753 	return;
754 }
755 
756 void
757 proxy_error(struct bufferevent *bev, short err, void *d)
758 {
759 	struct client		*clt = d;
760 	int			 status = !(err & EVBUFFER_EOF);
761 
762 	log_debug("proxy error, shutting down the connection (err: %x)",
763 	    err);
764 
765 	if (!clt->clt_headersdone) {
766 		if (proxy_start_reply(clt, 501, "text/html") == -1)
767 			return;
768 		if (tp_error(clt->clt_tp, -1, "Proxy error") == -1)
769 			return;
770 	} else if (status == 0) {
771 		if (clt->clt_translate & TR_PRE) {
772 			if (clt_puts(clt, "</pre>"))
773 				return;
774 			clt->clt_translate &= ~TR_PRE;
775 		}
776 
777 		if (clt->clt_translate & TR_LIST) {
778 			if (clt_puts(clt, "</ul>") == -1)
779 				return;
780 			clt->clt_translate &= ~TR_LIST;
781 		}
782 
783 		if (clt->clt_translate & TR_NAV) {
784 			if (clt_puts(clt, "</ul></nav>") == -1)
785 				return;
786 			clt->clt_translate &= ~TR_NAV;
787 		}
788 
789 		if (clt->clt_translate &&
790 		    tp_foot(clt->clt_tp) == -1)
791 			return;
792 	}
793 
794 	fcgi_end_request(clt, status);
795 }
796 
797 void
798 proxy_tls_readcb(int fd, short event, void *arg)
799 {
800 	struct bufferevent	*bufev = arg;
801 	struct client		*clt = bufev->cbarg;
802 	char			 rbuf[IBUF_READ_SIZE];
803 	int			 what = EVBUFFER_READ;
804 	int			 howmuch = IBUF_READ_SIZE;
805 	ssize_t			 ret;
806 	size_t			 len;
807 
808 	if (event == EV_TIMEOUT) {
809 		what |= EVBUFFER_TIMEOUT;
810 		goto err;
811 	}
812 
813 	if (bufev->wm_read.high != 0)
814 		howmuch = MINIMUM(sizeof(rbuf), bufev->wm_read.high);
815 
816 	ret = tls_read(clt->clt_ctx, rbuf, howmuch);
817 	if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) {
818 		goto retry;
819 	} else if (ret == -1) {
820 		what |= EVBUFFER_ERROR;
821 		goto err;
822 	}
823 	len = ret;
824 
825 	if (len == 0) {
826 		what |= EVBUFFER_EOF;
827 		goto err;
828 	}
829 
830 	if (evbuffer_add(bufev->input, rbuf, len) == -1) {
831 		what |= EVBUFFER_ERROR;
832 		goto err;
833 	}
834 
835 	proxy_bufferevent_add(&bufev->ev_read, bufev->timeout_read);
836 
837 	len = EVBUFFER_LENGTH(bufev->input);
838 	if (bufev->wm_read.low != 0 && len < bufev->wm_read.low)
839 		return;
840 	if (bufev->wm_read.high != 0 && len > bufev->wm_read.high) {
841 		struct evbuffer *buf = bufev->input;
842 		event_del(&bufev->ev_read);
843 		evbuffer_setcb(buf, bufferevent_read_pressure_cb, bufev);
844 		return;
845 	}
846 
847 	if (bufev->readcb != NULL)
848 		(*bufev->readcb)(bufev, bufev->cbarg);
849 	return;
850 
851 retry:
852 	proxy_bufferevent_add(&bufev->ev_read, bufev->timeout_read);
853 	return;
854 
855 err:
856 	(*bufev->errorcb)(bufev, what, bufev->cbarg);
857 }
858 
859 int
860 proxy_bufferevent_add(struct event *ev, int timeout)
861 {
862 	struct timeval tv, *ptv = NULL;
863 
864 	if (timeout) {
865 		timerclear(&tv);
866 		tv.tv_sec = timeout;
867 		ptv = &tv;
868 	}
869 
870 	return (event_add(ev, ptv));
871 }
872 
873 void
874 proxy_tls_writecb(int fd, short event, void *arg)
875 {
876 	struct bufferevent	*bufev = arg;
877 	struct client		*clt = bufev->cbarg;
878 	ssize_t			 ret;
879 	short			 what = EVBUFFER_WRITE;
880 	size_t			 len;
881 
882 	if (event == EV_TIMEOUT) {
883 		what |= EVBUFFER_TIMEOUT;
884 		goto err;
885 	}
886 
887 	if (EVBUFFER_LENGTH(bufev->output)) {
888 		ret = tls_write(clt->clt_ctx,
889 		    EVBUFFER_DATA(bufev->output),
890 		    EVBUFFER_LENGTH(bufev->output));
891 		if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) {
892 			goto retry;
893 		} else if (ret == -1) {
894 			what |= EVBUFFER_ERROR;
895 			goto err;
896 		}
897 		len = ret;
898 		evbuffer_drain(bufev->output, len);
899 	}
900 
901 	if (EVBUFFER_LENGTH(bufev->output) != 0)
902 		proxy_bufferevent_add(&bufev->ev_write, bufev->timeout_write);
903 
904 	if (bufev->writecb != NULL &&
905 	    EVBUFFER_LENGTH(bufev->output) <= bufev->wm_write.low)
906 		(*bufev->writecb)(bufev, bufev->cbarg);
907 	return;
908 
909 retry:
910 	proxy_bufferevent_add(&bufev->ev_write, bufev->timeout_write);
911 	return;
912 
913 err:
914 	(*bufev->errorcb)(bufev, what, bufev->cbarg);
915 }
916 
917 void
918 proxy_client_free(struct client *clt)
919 {
920 	if (clt->clt_evasr)
921 		event_asr_abort(clt->clt_evasr);
922 
923 	if (clt->clt_addrinfo)
924 		freeaddrinfo(clt->clt_addrinfo);
925 
926 	if (clt->clt_evconn_live)
927 		event_del(&clt->clt_evconn);
928 
929 	if (clt->clt_fd != -1)
930 		close(clt->clt_fd);
931 
932 	if (clt->clt_ctx)
933 		tls_free(clt->clt_ctx);
934 
935 	if (clt->clt_bev)
936 		bufferevent_free(clt->clt_bev);
937 
938 	free(clt->clt_body);
939 	free(clt->clt_tp);
940 	free(clt->clt_server_name);
941 	free(clt->clt_script_name);
942 	free(clt->clt_path_info);
943 	free(clt->clt_query);
944 	free(clt);
945 }