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