2 b0a6bcf7 2022-09-13 op * Copyright (c) 2022 Omar Polo <op@omarpolo.com>
3 b0a6bcf7 2022-09-13 op * Copyright (c) 2006 - 2015 Reyk Floeter <reyk@openbsd.org>
5 b0a6bcf7 2022-09-13 op * Permission to use, copy, modify, and distribute this software for any
6 b0a6bcf7 2022-09-13 op * purpose with or without fee is hereby granted, provided that the above
7 b0a6bcf7 2022-09-13 op * copyright notice and this permission notice appear in all copies.
9 b0a6bcf7 2022-09-13 op * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 b0a6bcf7 2022-09-13 op * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 b0a6bcf7 2022-09-13 op * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 b0a6bcf7 2022-09-13 op * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 b0a6bcf7 2022-09-13 op * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 b0a6bcf7 2022-09-13 op * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 b0a6bcf7 2022-09-13 op * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 b0a6bcf7 2022-09-13 op #include <sys/types.h>
19 b0a6bcf7 2022-09-13 op #include <sys/queue.h>
20 b0a6bcf7 2022-09-13 op #include <sys/tree.h>
21 b0a6bcf7 2022-09-13 op #include <sys/socket.h>
22 b0a6bcf7 2022-09-13 op #include <sys/uio.h>
24 b0a6bcf7 2022-09-13 op #include <netinet/in.h>
25 b0a6bcf7 2022-09-13 op #include <arpa/inet.h>
26 b0a6bcf7 2022-09-13 op #include <netdb.h>
28 b0a6bcf7 2022-09-13 op #include <asr.h>
29 b0a6bcf7 2022-09-13 op #include <ctype.h>
30 b0a6bcf7 2022-09-13 op #include <errno.h>
31 b0a6bcf7 2022-09-13 op #include <event.h>
32 33f4bf26 2022-09-14 op #include <fnmatch.h>
33 b0a6bcf7 2022-09-13 op #include <limits.h>
34 b0a6bcf7 2022-09-13 op #include <stdlib.h>
35 b0a6bcf7 2022-09-13 op #include <stdint.h>
36 b0a6bcf7 2022-09-13 op #include <stdio.h>
37 b0a6bcf7 2022-09-13 op #include <string.h>
38 b0a6bcf7 2022-09-13 op #include <imsg.h>
39 b0a6bcf7 2022-09-13 op #include <tls.h>
40 b0a6bcf7 2022-09-13 op #include <unistd.h>
42 b0a6bcf7 2022-09-13 op #include "log.h"
43 b0a6bcf7 2022-09-13 op #include "proc.h"
44 bff58270 2022-09-19 op #include "tmpl.h"
46 b0a6bcf7 2022-09-13 op #include "galileo.h"
48 b0a6bcf7 2022-09-13 op #define MINIMUM(a, b) ((a) < (b) ? (a) : (b))
50 b0a6bcf7 2022-09-13 op /* provided by OpenBSD' base libevent but not in any header? */
51 b0a6bcf7 2022-09-13 op extern void bufferevent_read_pressure_cb(struct evbuffer *, size_t,
52 b0a6bcf7 2022-09-13 op size_t, void *);
54 b0a6bcf7 2022-09-13 op void proxy_init(struct privsep *, struct privsep_proc *, void *);
55 b0a6bcf7 2022-09-13 op int proxy_launch(struct galileo *);
56 b0a6bcf7 2022-09-13 op void proxy_inflight_dec(const char *);
57 b0a6bcf7 2022-09-13 op int proxy_dispatch_parent(int, struct privsep_proc *, struct imsg *);
58 c9dc4bc6 2022-09-13 op void proxy_translate_gemtext(struct client *);
59 b0a6bcf7 2022-09-13 op void proxy_resolved(struct asr_result *, void *);
60 b0a6bcf7 2022-09-13 op void proxy_connect(int, short, void *);
61 b0a6bcf7 2022-09-13 op void proxy_read(struct bufferevent *, void *);
62 b0a6bcf7 2022-09-13 op void proxy_write(struct bufferevent *, void *);
63 b0a6bcf7 2022-09-13 op void proxy_error(struct bufferevent *, short, void *);
64 b0a6bcf7 2022-09-13 op int proxy_bufferevent_add(struct event *, int);
65 b0a6bcf7 2022-09-13 op void proxy_tls_writecb(int, short, void *);
66 b0a6bcf7 2022-09-13 op void proxy_tls_readcb(int, short, void *);
68 b0a6bcf7 2022-09-13 op static struct privsep_proc procs[] = {
69 b0a6bcf7 2022-09-13 op { "parent", PROC_PARENT, proxy_dispatch_parent },
72 b0a6bcf7 2022-09-13 op volatile int proxy_clients;
73 b0a6bcf7 2022-09-13 op volatile int proxy_inflight;
74 b0a6bcf7 2022-09-13 op uint32_t proxy_fcg_id;
77 b0a6bcf7 2022-09-13 op proxy(struct privsep *ps, struct privsep_proc *p)
79 b0a6bcf7 2022-09-13 op proc_run(ps, p, procs, nitems(procs), proxy_init, NULL);
83 b0a6bcf7 2022-09-13 op proxy_init(struct privsep *ps, struct privsep_proc *p, void *arg)
85 b0a6bcf7 2022-09-13 op if (config_init(ps->ps_env) == -1)
86 b0a6bcf7 2022-09-13 op fatal("failed to initialize configuration");
88 b0a6bcf7 2022-09-13 op /* We use a custom shutdown callback */
89 b0a6bcf7 2022-09-13 op /* p->p_shutdown = proxy_shutdown */
91 b0a6bcf7 2022-09-13 op if (pledge("stdio recvfd unix inet dns", NULL) == -1)
92 b0a6bcf7 2022-09-13 op fatal("pledge");
96 b0a6bcf7 2022-09-13 op proxy_launch(struct galileo *env)
98 b0a6bcf7 2022-09-13 op event_add(&env->sc_evsock, NULL);
103 b0a6bcf7 2022-09-13 op proxy_purge(struct server *srv)
108 b0a6bcf7 2022-09-13 op proxy_inflight_dec(const char *why)
110 b0a6bcf7 2022-09-13 op proxy_inflight--;
111 b0a6bcf7 2022-09-13 op log_debug("%s: inflight decremented, now %d, %s",
112 b0a6bcf7 2022-09-13 op __func__, proxy_inflight, why);
116 b0a6bcf7 2022-09-13 op proxy_dispatch_parent(int fd, struct privsep_proc *p, struct imsg *imsg)
118 b0a6bcf7 2022-09-13 op struct privsep *ps = p->p_ps;
119 b0a6bcf7 2022-09-13 op struct galileo *env = ps->ps_env;
121 b0a6bcf7 2022-09-13 op switch (imsg->hdr.type) {
122 b0a6bcf7 2022-09-13 op case IMSG_CFG_SRV:
123 b0a6bcf7 2022-09-13 op if (config_getserver(env, imsg) == -1)
124 b0a6bcf7 2022-09-13 op fatal("config_getproxy");
126 b0a6bcf7 2022-09-13 op case IMSG_CFG_SOCK:
127 b0a6bcf7 2022-09-13 op /* XXX: improve */
129 b0a6bcf7 2022-09-13 op if (env->sc_sock_fd != -1) {
130 b0a6bcf7 2022-09-13 op event_del(&env->sc_evsock);
131 b0a6bcf7 2022-09-13 op close(env->sc_sock_fd);
134 b0a6bcf7 2022-09-13 op env->sc_sock_fd = config_getsock(env, imsg);
135 b0a6bcf7 2022-09-13 op if (env->sc_sock_fd == -1)
136 b0a6bcf7 2022-09-13 op fatal("config_getsock");
138 b0a6bcf7 2022-09-13 op event_set(&env->sc_evsock, env->sc_sock_fd,
139 ea8874f1 2022-09-13 op EV_READ | EV_PERSIST, fcgi_accept, env);
140 b0a6bcf7 2022-09-13 op event_add(&env->sc_evsock, NULL);
141 ea8874f1 2022-09-13 op evtimer_set(&env->sc_evpause, fcgi_accept, env);
143 b0a6bcf7 2022-09-13 op case IMSG_CFG_DONE:
144 b0a6bcf7 2022-09-13 op log_debug("config done!");
146 b0a6bcf7 2022-09-13 op case IMSG_CTL_START:
147 b0a6bcf7 2022-09-13 op proxy_launch(env);
150 b0a6bcf7 2022-09-13 op log_warnx("unknown message %d", imsg->hdr.type);
157 c9dc4bc6 2022-09-13 op static inline int
158 c9dc4bc6 2022-09-13 op printurl(struct client *clt, const char *str)
160 c9dc4bc6 2022-09-13 op for (; *str; ++str) {
161 c9dc4bc6 2022-09-13 op switch (*str) {
166 c9dc4bc6 2022-09-13 op if (clt_printf(clt, "%2X", (unsigned char)*str) == -1)
170 c9dc4bc6 2022-09-13 op if (clt_putc(clt, *str) == -1)
179 c9dc4bc6 2022-09-13 op static inline int
180 c9dc4bc6 2022-09-13 op htmlescape(struct client *clt, const char *str)
184 c9dc4bc6 2022-09-13 op for (; *str; ++str) {
185 c9dc4bc6 2022-09-13 op switch (*str) {
187 c9dc4bc6 2022-09-13 op r = clt_puts(clt, "<");
190 c9dc4bc6 2022-09-13 op r = clt_puts(clt, ">");
193 c9dc4bc6 2022-09-13 op r = clt_puts(clt, "&");
196 c9dc4bc6 2022-09-13 op r = clt_putc(clt, *str);
208 c9dc4bc6 2022-09-13 op gemtext_translate_line(struct client *clt, char *line)
210 c9dc4bc6 2022-09-13 op /* preformatted line / closing */
211 b9de0a74 2022-09-14 op if (clt->clt_translate & TR_PRE) {
212 c9dc4bc6 2022-09-13 op if (!strncmp(line, "```", 3)) {
213 b9de0a74 2022-09-14 op clt->clt_translate &= ~TR_PRE;
214 c9dc4bc6 2022-09-13 op return (clt_puts(clt, "</pre>"));
217 c9dc4bc6 2022-09-13 op if (htmlescape(clt, line) == -1)
219 c9dc4bc6 2022-09-13 op return (clt_putc(clt, '\n'));
223 b9de0a74 2022-09-14 op if (!strncmp(line, "* ", 2)) {
224 b9de0a74 2022-09-14 op if (clt->clt_translate & TR_NAV) {
225 b9de0a74 2022-09-14 op if (clt_puts(clt, "</ul></nav>") == -1)
227 b9de0a74 2022-09-14 op clt->clt_translate &= ~TR_NAV;
230 b9de0a74 2022-09-14 op if (!(clt->clt_translate & TR_LIST)) {
231 b9de0a74 2022-09-14 op if (clt_puts(clt, "<ul>") == -1)
233 b9de0a74 2022-09-14 op clt->clt_translate |= TR_LIST;
236 b9de0a74 2022-09-14 op if (clt_puts(clt, "<li>") == -1 ||
237 b9de0a74 2022-09-14 op htmlescape(clt, line + 2) == -1 ||
238 b9de0a74 2022-09-14 op clt_puts(clt, "</li>") == -1)
243 b9de0a74 2022-09-14 op if (clt->clt_translate & TR_LIST) {
244 b9de0a74 2022-09-14 op if (clt_puts(clt, "</ul>") == -1)
246 b9de0a74 2022-09-14 op clt->clt_translate &= ~TR_LIST;
249 b9de0a74 2022-09-14 op /* link -- TODO: relativify from SCRIPT_NAME */
250 b9de0a74 2022-09-14 op if (!strncmp(line, "=>", 2)) {
254 b9de0a74 2022-09-14 op line += strspn(line, " \t");
256 b9de0a74 2022-09-14 op label = line + strcspn(line, " \t");
257 b9de0a74 2022-09-14 op if (*label == '\0')
258 b9de0a74 2022-09-14 op label = line;
260 b9de0a74 2022-09-14 op *label++ = '\0';
262 33f4bf26 2022-09-14 op if (fnmatch("*.jpg", line, 0) == 0 ||
263 33f4bf26 2022-09-14 op fnmatch("*.jpeg", line, 0) == 0 ||
264 33f4bf26 2022-09-14 op fnmatch("*.gif", line, 0) == 0 ||
265 33f4bf26 2022-09-14 op fnmatch("*.png", line, 0) == 0 ||
266 33f4bf26 2022-09-14 op fnmatch("*.svg", line, 0) == 0 ||
267 33f4bf26 2022-09-14 op fnmatch("*.webp", line, 0) == 0) {
268 33f4bf26 2022-09-14 op if (clt->clt_translate & TR_NAV) {
269 33f4bf26 2022-09-14 op if (clt_puts(clt, "</ul></nav>") == -1)
271 33f4bf26 2022-09-14 op clt->clt_translate &= ~TR_NAV;
274 bff58270 2022-09-19 op if (tp_figure(clt->clt_tp, line, label) == -1)
280 33f4bf26 2022-09-14 op if (!(clt->clt_translate & TR_NAV)) {
281 33f4bf26 2022-09-14 op if (clt_puts(clt, "<nav><ul>") == -1)
283 33f4bf26 2022-09-14 op clt->clt_translate |= TR_NAV;
286 b9de0a74 2022-09-14 op if (clt_puts(clt, "<li><a href='") == -1 ||
287 b9de0a74 2022-09-14 op printurl(clt, line) == -1 ||
288 b9de0a74 2022-09-14 op clt_puts(clt, "'>") == -1 ||
289 b9de0a74 2022-09-14 op htmlescape(clt, label) == -1 ||
290 b9de0a74 2022-09-14 op clt_puts(clt, "</a></li>") == -1)
296 b9de0a74 2022-09-14 op if (clt->clt_translate & TR_NAV) {
297 b9de0a74 2022-09-14 op if (clt_puts(clt, "</ul></nav>") == -1)
299 b9de0a74 2022-09-14 op clt->clt_translate &= ~TR_NAV;
302 c9dc4bc6 2022-09-13 op /* pre opening */
303 c9dc4bc6 2022-09-13 op if (!strncmp(line, "```", 3)) {
304 b9de0a74 2022-09-14 op clt->clt_translate |= TR_PRE;
305 c9dc4bc6 2022-09-13 op return (clt_puts(clt, "<pre>"));
308 c9dc4bc6 2022-09-13 op /* citation block */
309 c9dc4bc6 2022-09-13 op if (*line == '>') {
310 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<blockquote>") == -1 ||
311 c9dc4bc6 2022-09-13 op htmlescape(clt, line + 1) == -1 ||
312 c9dc4bc6 2022-09-13 op clt_puts(clt, "</blockquote>") == -1)
317 c9dc4bc6 2022-09-13 op /* headings */
318 c9dc4bc6 2022-09-13 op if (!strncmp(line, "###", 3)) {
319 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<h3>") == -1 ||
320 c9dc4bc6 2022-09-13 op htmlescape(clt, line + 3) == -1 ||
321 c9dc4bc6 2022-09-13 op clt_puts(clt, "</h3>") == -1)
325 c9dc4bc6 2022-09-13 op if (!strncmp(line, "##", 2)) {
326 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<h2>") == -1 ||
327 c9dc4bc6 2022-09-13 op htmlescape(clt, line + 2) == -1 ||
328 c9dc4bc6 2022-09-13 op clt_puts(clt, "</h2>") == -1)
332 c9dc4bc6 2022-09-13 op if (!strncmp(line, "#", 1)) {
333 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<h1>") == -1 ||
334 c9dc4bc6 2022-09-13 op htmlescape(clt, line + 1) == -1 ||
335 c9dc4bc6 2022-09-13 op clt_puts(clt, "</h1>") == -1)
340 df5279ca 2022-09-14 op /* Not following strictly the gemini specification... */
341 df5279ca 2022-09-14 op if (*line == '\0')
344 c9dc4bc6 2022-09-13 op /* paragraph */
345 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<p>") == -1 ||
346 c9dc4bc6 2022-09-13 op htmlescape(clt, line) == -1 ||
347 c9dc4bc6 2022-09-13 op clt_puts(clt, "</p>") == -1)
354 c9dc4bc6 2022-09-13 op proxy_translate_gemtext(struct client *clt)
356 c9dc4bc6 2022-09-13 op struct bufferevent *bev = clt->clt_bev;
357 c9dc4bc6 2022-09-13 op struct evbuffer *src = EVBUFFER_INPUT(bev);
363 b9de0a74 2022-09-14 op line = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF);
364 c9dc4bc6 2022-09-13 op if (line == NULL)
367 c9dc4bc6 2022-09-13 op r = gemtext_translate_line(clt, line);
374 b0a6bcf7 2022-09-13 op static struct proxy_config *
375 b0a6bcf7 2022-09-13 op proxy_server_match(struct galileo *env, struct client *clt)
377 b0a6bcf7 2022-09-13 op struct server *srv;
379 b0a6bcf7 2022-09-13 op if (clt->clt_server_name == NULL)
382 b0a6bcf7 2022-09-13 op TAILQ_FOREACH(srv, &env->sc_servers, srv_entry) {
383 b0a6bcf7 2022-09-13 op if (!strcmp(clt->clt_server_name, srv->srv_conf.host))
384 b0a6bcf7 2022-09-13 op return &srv->srv_conf;
391 b0a6bcf7 2022-09-13 op proxy_start_request(struct galileo *env, struct client *clt)
393 b0a6bcf7 2022-09-13 op struct addrinfo hints;
394 b0a6bcf7 2022-09-13 op struct asr_query *query;
395 b0a6bcf7 2022-09-13 op char port[32];
397 b0a6bcf7 2022-09-13 op if ((clt->clt_pc = proxy_server_match(env, clt)) == NULL) {
398 b0a6bcf7 2022-09-13 op if (clt_printf(clt, "Status: 501\r\n\r\n") == -1)
400 b0a6bcf7 2022-09-13 op fcgi_end_request(clt, 1);
404 b0a6bcf7 2022-09-13 op (void)snprintf(port, sizeof(port), "%d", clt->clt_pc->proxy_port);
406 b0a6bcf7 2022-09-13 op memset(&hints, 0, sizeof(hints));
407 b0a6bcf7 2022-09-13 op hints.ai_family = AF_UNSPEC;
408 b0a6bcf7 2022-09-13 op hints.ai_socktype = SOCK_STREAM;
410 b0a6bcf7 2022-09-13 op query = getaddrinfo_async(clt->clt_pc->proxy_addr, port, &hints, NULL);
411 b0a6bcf7 2022-09-13 op if (query == NULL) {
412 b0a6bcf7 2022-09-13 op log_warn("getaddrinfo_async");
413 b0a6bcf7 2022-09-13 op fcgi_abort_request(clt);
417 b0a6bcf7 2022-09-13 op clt->clt_evasr = event_asr_run(query, proxy_resolved, clt);
418 b0a6bcf7 2022-09-13 op if (clt->clt_evasr == NULL) {
419 b0a6bcf7 2022-09-13 op log_warn("event_asr_run");
420 b0a6bcf7 2022-09-13 op asr_abort(query);
421 b0a6bcf7 2022-09-13 op fcgi_abort_request(clt);
427 b0a6bcf7 2022-09-13 op proxy_resolved(struct asr_result *res, void *d)
429 b0a6bcf7 2022-09-13 op struct client *clt = d;
430 b0a6bcf7 2022-09-13 op struct proxy_config *pc = clt->clt_pc;
432 b0a6bcf7 2022-09-13 op clt->clt_evasr = NULL;
434 b0a6bcf7 2022-09-13 op if (res->ar_gai_errno != 0) {
435 b0a6bcf7 2022-09-13 op log_warnx("failed to resolve %s:%d: %s",
436 b0a6bcf7 2022-09-13 op pc->proxy_addr, pc->proxy_port,
437 b0a6bcf7 2022-09-13 op gai_strerror(res->ar_gai_errno));
438 b0a6bcf7 2022-09-13 op if (clt_printf(clt, "Status: 501\r\n") == -1)
440 b0a6bcf7 2022-09-13 op if (clt_printf(clt, "Content-Type: text/plain\r\n") == -1)
442 b0a6bcf7 2022-09-13 op if (clt_printf(clt, "Proxy error; connection failed") == -1)
444 b0a6bcf7 2022-09-13 op fcgi_end_request(clt, 1);
448 b0a6bcf7 2022-09-13 op clt->clt_addrinfo = res->ar_addrinfo;
449 b0a6bcf7 2022-09-13 op clt->clt_p = clt->clt_addrinfo;
450 b0a6bcf7 2022-09-13 op proxy_connect(-1, 0, clt);
454 b0a6bcf7 2022-09-13 op proxy_connect(int fd, short ev, void *d)
456 b0a6bcf7 2022-09-13 op struct client *clt = d;
457 b0a6bcf7 2022-09-13 op struct evbuffer *out;
458 b0a6bcf7 2022-09-13 op struct addrinfo *p;
459 b0a6bcf7 2022-09-13 op struct tls_config *conf;
460 b0a6bcf7 2022-09-13 op struct timeval conntv = {5, 0};
462 b0a6bcf7 2022-09-13 op socklen_t len = sizeof(err);
465 b0a6bcf7 2022-09-13 op if (clt->clt_p == NULL)
468 b0a6bcf7 2022-09-13 op if (clt->clt_fd != -1) {
469 b0a6bcf7 2022-09-13 op if (getsockopt(clt->clt_fd, SOL_SOCKET, SO_ERROR, &err, &len)
472 b0a6bcf7 2022-09-13 op if (err != 0) {
479 b0a6bcf7 2022-09-13 op p = clt->clt_p;
480 b0a6bcf7 2022-09-13 op clt->clt_fd = socket(p->ai_family, p->ai_socktype | SOCK_NONBLOCK,
481 b0a6bcf7 2022-09-13 op p->ai_protocol);
482 b0a6bcf7 2022-09-13 op if (clt->clt_fd == -1) {
483 b0a6bcf7 2022-09-13 op clt->clt_p = clt->clt_p->ai_next;
487 b0a6bcf7 2022-09-13 op if (connect(clt->clt_fd, p->ai_addr, p->ai_addrlen) == 0)
490 b0a6bcf7 2022-09-13 op clt->clt_evconn_live = 1;
491 b0a6bcf7 2022-09-13 op event_set(&clt->clt_evconn, clt->clt_fd, EV_WRITE, proxy_connect, clt);
492 b0a6bcf7 2022-09-13 op event_add(&clt->clt_evconn, &conntv);
496 b0a6bcf7 2022-09-13 op clt->clt_evconn_live = 0;
497 b0a6bcf7 2022-09-13 op freeaddrinfo(clt->clt_addrinfo);
498 b0a6bcf7 2022-09-13 op clt->clt_addrinfo = clt->clt_p = NULL;
500 b0a6bcf7 2022-09-13 op /* initialize TLS for Gemini */
501 b0a6bcf7 2022-09-13 op if ((conf = tls_config_new()) == NULL) {
502 b0a6bcf7 2022-09-13 op log_warn("tls_config_new failed");
506 b0a6bcf7 2022-09-13 op tls_config_insecure_noverifycert(conf);
508 b0a6bcf7 2022-09-13 op if ((clt->clt_ctx = tls_client()) == NULL) {
509 b0a6bcf7 2022-09-13 op log_warnx("tls_client failed");
510 b0a6bcf7 2022-09-13 op tls_config_free(conf);
514 b0a6bcf7 2022-09-13 op if (tls_configure(clt->clt_ctx, conf) == -1) {
515 b0a6bcf7 2022-09-13 op log_warnx("tls_configure failed");
516 b0a6bcf7 2022-09-13 op tls_config_free(conf);
520 b0a6bcf7 2022-09-13 op tls_config_free(conf);
522 b0a6bcf7 2022-09-13 op if (tls_connect_socket(clt->clt_ctx, clt->clt_fd,
523 b0a6bcf7 2022-09-13 op clt->clt_pc->proxy_name) == -1) {
524 b0a6bcf7 2022-09-13 op log_warnx("tls_connect_socket failed");
528 b0a6bcf7 2022-09-13 op clt->clt_bev = bufferevent_new(clt->clt_fd, proxy_read, proxy_write,
529 b0a6bcf7 2022-09-13 op proxy_error, clt);
530 b0a6bcf7 2022-09-13 op if (clt->clt_bev == NULL) {
531 b0a6bcf7 2022-09-13 op log_warn("bufferevent_new");
534 b0a6bcf7 2022-09-13 op out = EVBUFFER_OUTPUT(clt->clt_bev);
536 b0a6bcf7 2022-09-13 op event_set(&clt->clt_bev->ev_read, clt->clt_fd, EV_READ,
537 b0a6bcf7 2022-09-13 op proxy_tls_readcb, clt->clt_bev);
538 b0a6bcf7 2022-09-13 op event_set(&clt->clt_bev->ev_write, clt->clt_fd, EV_WRITE,
539 b0a6bcf7 2022-09-13 op proxy_tls_writecb, clt->clt_bev);
541 b0a6bcf7 2022-09-13 op /* bufferevent_settimeout(); */
542 b0a6bcf7 2022-09-13 op bufferevent_enable(clt->clt_bev, EV_READ|EV_WRITE);
544 b0a6bcf7 2022-09-13 op /* TODO: compute the URL */
545 ee80262d 2022-09-13 op if (evbuffer_add_printf(out, "gemini://%s/%s\r\n",
546 ee80262d 2022-09-13 op clt->clt_pc->proxy_name, clt->clt_path_info) == -1) {
547 b0a6bcf7 2022-09-13 op log_warn("bufferevent_printf failed");
554 b0a6bcf7 2022-09-13 op log_warn("failed to connect to %s:%d",
555 b0a6bcf7 2022-09-13 op clt->clt_pc->proxy_addr, clt->clt_pc->proxy_port);
556 b0a6bcf7 2022-09-13 op if (clt_printf(clt, "Status: 501\r\n") == -1)
558 b0a6bcf7 2022-09-13 op if (clt_printf(clt, "Content-Type: text/plain\r\n") == -1)
560 b0a6bcf7 2022-09-13 op if (clt_printf(clt, "Proxy error; connection failed") == -1)
562 b0a6bcf7 2022-09-13 op fcgi_end_request(clt, 1);
565 6edd9a00 2022-09-14 op static inline int
566 6edd9a00 2022-09-14 op parse_mime(struct client *clt, char *mime, char *lang, size_t len)
568 6edd9a00 2022-09-14 op char *t, *semi;
570 6edd9a00 2022-09-14 op if (strncmp(mime, "text/gemini", 11) != 0)
573 6edd9a00 2022-09-14 op clt->clt_translate = TR_ENABLED;
575 6edd9a00 2022-09-14 op if ((mime = strchr(mime, ';')) == NULL)
578 6edd9a00 2022-09-14 op *mime++ = '\0';
579 6edd9a00 2022-09-14 op while ((t = strsep(&mime, ";")) != NULL) {
580 6edd9a00 2022-09-14 op if (!strncmp(t, "charset=", 8)) {
582 6edd9a00 2022-09-14 op if (!strncasecmp(t, "utf8", 4) ||
583 8ab2d60e 2022-09-14 op !strncasecmp(t, "utf-8", 5) ||
584 6edd9a00 2022-09-14 op !strncasecmp(t, "ascii", 5)) {
585 6edd9a00 2022-09-14 op log_debug("unknown charset %s", t);
591 6edd9a00 2022-09-14 op if (!strncmp(t, "lang=", 5)) {
593 6edd9a00 2022-09-14 op if ((semi = strchr(t, ';')) != NULL)
594 6edd9a00 2022-09-14 op *semi = '\0';
596 6edd9a00 2022-09-14 op if (strlcpy(lang, t, len) >= len) {
597 6edd9a00 2022-09-14 op log_debug("lang too long: %s", t);
598 6edd9a00 2022-09-14 op *lang = '\0';
611 bff58270 2022-09-19 op proxy_tp_puts(struct template *tp, const char *c)
613 bff58270 2022-09-19 op struct client *clt = tp->tp_arg;
615 bff58270 2022-09-19 op if (clt_puts(clt, c) == -1) {
616 bff58270 2022-09-19 op tp->tp_ret = -1;
623 bff58270 2022-09-19 op proxy_tp_putc(struct template *tp, int c)
625 bff58270 2022-09-19 op struct client *clt = tp->tp_arg;
627 bff58270 2022-09-19 op if (clt_putc(clt, c) == -1) {
628 bff58270 2022-09-19 op tp->tp_ret = -1;
635 b0a6bcf7 2022-09-13 op proxy_read(struct bufferevent *bev, void *d)
637 b0a6bcf7 2022-09-13 op struct client *clt = d;
638 fc1cb9ea 2022-09-14 op struct proxy_config *pc = clt->clt_pc;
639 b0a6bcf7 2022-09-13 op struct evbuffer *src = EVBUFFER_INPUT(bev);
640 c9dc4bc6 2022-09-13 op const char *ctype;
641 6edd9a00 2022-09-14 op char lang[16];
642 6edd9a00 2022-09-14 op char *hdr, *mime;
645 b0a6bcf7 2022-09-13 op if (clt->clt_headersdone) {
646 c9dc4bc6 2022-09-13 op if (clt->clt_translate)
647 c9dc4bc6 2022-09-13 op proxy_translate_gemtext(clt);
649 c9dc4bc6 2022-09-13 op clt_write_bufferevent(clt, bev);
653 b0a6bcf7 2022-09-13 op hdr = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF_STRICT);
654 b0a6bcf7 2022-09-13 op if (hdr == NULL) {
655 b0a6bcf7 2022-09-13 op if (EVBUFFER_LENGTH(src) >= 1026)
656 b0a6bcf7 2022-09-13 op proxy_error(bev, EV_READ, clt);
660 b0a6bcf7 2022-09-13 op if (len < 4 ||
661 b0a6bcf7 2022-09-13 op !isdigit((unsigned char)hdr[0]) ||
662 b0a6bcf7 2022-09-13 op !isdigit((unsigned char)hdr[1]) ||
663 b0a6bcf7 2022-09-13 op hdr[2] != ' ') {
664 b0a6bcf7 2022-09-13 op log_warnx("invalid ");
665 b0a6bcf7 2022-09-13 op proxy_error(bev, EV_READ, clt);
669 6e8f426e 2022-09-14 op switch (hdr[0]) {
671 6e8f426e 2022-09-14 op /* handled below */
674 6e8f426e 2022-09-14 op if (clt_puts(clt, "Status: 501\r\n") == -1)
676 6e8f426e 2022-09-14 op if (clt_puts(clt,
677 8ab2d60e 2022-09-14 op "Content-Type: text/plain;charset=utf-8\r\n") == -1)
679 6e8f426e 2022-09-14 op if (clt_puts(clt, "\r\n") == -1)
681 6e8f426e 2022-09-14 op if (clt_printf(clt, "Request failed with code %c%c\n\n",
682 6e8f426e 2022-09-14 op hdr[0], hdr[1]) == -1)
684 6e8f426e 2022-09-14 op if (clt_printf(clt, "The server says: %s\n", &hdr[3]) == -1)
686 6e8f426e 2022-09-14 op fcgi_end_request(clt, 1);
690 6edd9a00 2022-09-14 op mime = hdr + 2 + strspn(hdr + 2, " \t");
691 6edd9a00 2022-09-14 op if (parse_mime(clt, mime, lang, sizeof(lang)) == -1) {
692 6edd9a00 2022-09-14 op if (clt_puts(clt, "Status: 501\r\n") == -1)
694 6edd9a00 2022-09-14 op if (clt_puts(clt,
695 8ab2d60e 2022-09-14 op "Content-Type: text/plain;charset=utf-8\r\n") == -1)
697 6edd9a00 2022-09-14 op if (clt_puts(clt, "\r\n") == -1)
699 6edd9a00 2022-09-14 op if (clt_printf(clt, "Failed to parse the Gemini response\n")
701 6edd9a00 2022-09-14 op fcgi_end_request(clt, 1);
705 bff58270 2022-09-19 op if (clt->clt_translate) {
706 bff58270 2022-09-19 op clt->clt_tp = template(clt, proxy_tp_puts, proxy_tp_putc);
708 8ab2d60e 2022-09-14 op ctype = "text/html;charset=utf-8";
710 6edd9a00 2022-09-14 op ctype = mime;
712 6edd9a00 2022-09-14 op if (clt_printf(clt, "Content-Type: %s\r\n\r\n", ctype) == -1)
715 b0a6bcf7 2022-09-13 op clt->clt_headersdone = 1;
717 bff58270 2022-09-19 op if (clt->clt_translate &&
718 bff58270 2022-09-19 op tp_head(clt->clt_tp, lang, pc->stylesheet) == -1)
722 1337dc2b 2022-09-14 op * Trigger the read again so we proceed with the response
723 1337dc2b 2022-09-14 op * body, if any.
726 1337dc2b 2022-09-14 op proxy_read(bev, d);
734 b0a6bcf7 2022-09-13 op proxy_write(struct bufferevent *bev, void *d)
740 b0a6bcf7 2022-09-13 op proxy_error(struct bufferevent *bev, short err, void *d)
742 b0a6bcf7 2022-09-13 op struct client *clt = d;
743 b0a6bcf7 2022-09-13 op int status = !(err & EVBUFFER_EOF);
745 b0a6bcf7 2022-09-13 op log_debug("proxy error, shutting down the connection (err: %x)",
748 b0a6bcf7 2022-09-13 op if (!clt->clt_headersdone) {
749 b0a6bcf7 2022-09-13 op if (clt_printf(clt, "Status: 501\r\n") == -1)
751 b0a6bcf7 2022-09-13 op if (clt_printf(clt, "Content-Type: text/plain\r\n") == -1)
753 b0a6bcf7 2022-09-13 op if (clt_printf(clt, "Proxy error\n") == -1)
755 c9dc4bc6 2022-09-13 op } else if (status == 0) {
756 c42fce9b 2022-09-14 op if (clt->clt_translate & TR_PRE) {
757 c42fce9b 2022-09-14 op if (clt_puts(clt, "</pre>"))
759 c42fce9b 2022-09-14 op clt->clt_translate &= ~TR_PRE;
762 c42fce9b 2022-09-14 op if (clt->clt_translate & TR_LIST) {
763 c42fce9b 2022-09-14 op if (clt_puts(clt, "</ul>") == -1)
765 c42fce9b 2022-09-14 op clt->clt_translate &= ~TR_LIST;
768 c42fce9b 2022-09-14 op if (clt->clt_translate & TR_NAV) {
769 c42fce9b 2022-09-14 op if (clt_puts(clt, "</ul></nav>") == -1)
771 c42fce9b 2022-09-14 op clt->clt_translate &= ~TR_NAV;
774 bff58270 2022-09-19 op if (tp_foot(clt->clt_tp) == -1)
778 b0a6bcf7 2022-09-13 op fcgi_end_request(clt, status);
782 b0a6bcf7 2022-09-13 op proxy_tls_readcb(int fd, short event, void *arg)
784 b0a6bcf7 2022-09-13 op struct bufferevent *bufev = arg;
785 b0a6bcf7 2022-09-13 op struct client *clt = bufev->cbarg;
786 b0a6bcf7 2022-09-13 op char rbuf[IBUF_READ_SIZE];
787 b0a6bcf7 2022-09-13 op int what = EVBUFFER_READ;
788 b0a6bcf7 2022-09-13 op int howmuch = IBUF_READ_SIZE;
792 b0a6bcf7 2022-09-13 op if (event == EV_TIMEOUT) {
793 b0a6bcf7 2022-09-13 op what |= EVBUFFER_TIMEOUT;
797 b0a6bcf7 2022-09-13 op if (bufev->wm_read.high != 0)
798 b0a6bcf7 2022-09-13 op howmuch = MINIMUM(sizeof(rbuf), bufev->wm_read.high);
800 b0a6bcf7 2022-09-13 op ret = tls_read(clt->clt_ctx, rbuf, howmuch);
801 b0a6bcf7 2022-09-13 op if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) {
803 b0a6bcf7 2022-09-13 op } else if (ret == -1) {
804 b0a6bcf7 2022-09-13 op what |= EVBUFFER_ERROR;
809 b0a6bcf7 2022-09-13 op if (len == 0) {
810 b0a6bcf7 2022-09-13 op what |= EVBUFFER_EOF;
814 b0a6bcf7 2022-09-13 op if (evbuffer_add(bufev->input, rbuf, len) == -1) {
815 b0a6bcf7 2022-09-13 op what |= EVBUFFER_ERROR;
819 b0a6bcf7 2022-09-13 op proxy_bufferevent_add(&bufev->ev_read, bufev->timeout_read);
821 b0a6bcf7 2022-09-13 op len = EVBUFFER_LENGTH(bufev->input);
822 b0a6bcf7 2022-09-13 op if (bufev->wm_read.low != 0 && len < bufev->wm_read.low)
824 b0a6bcf7 2022-09-13 op if (bufev->wm_read.high != 0 && len > bufev->wm_read.high) {
825 b0a6bcf7 2022-09-13 op struct evbuffer *buf = bufev->input;
826 b0a6bcf7 2022-09-13 op event_del(&bufev->ev_read);
827 b0a6bcf7 2022-09-13 op evbuffer_setcb(buf, bufferevent_read_pressure_cb, bufev);
831 b0a6bcf7 2022-09-13 op if (bufev->readcb != NULL)
832 b0a6bcf7 2022-09-13 op (*bufev->readcb)(bufev, bufev->cbarg);
836 b0a6bcf7 2022-09-13 op proxy_bufferevent_add(&bufev->ev_read, bufev->timeout_read);
840 b0a6bcf7 2022-09-13 op (*bufev->errorcb)(bufev, what, bufev->cbarg);
844 b0a6bcf7 2022-09-13 op proxy_bufferevent_add(struct event *ev, int timeout)
846 b0a6bcf7 2022-09-13 op struct timeval tv, *ptv = NULL;
848 b0a6bcf7 2022-09-13 op if (timeout) {
849 b0a6bcf7 2022-09-13 op timerclear(&tv);
850 b0a6bcf7 2022-09-13 op tv.tv_sec = timeout;
854 b0a6bcf7 2022-09-13 op return (event_add(ev, ptv));
858 b0a6bcf7 2022-09-13 op proxy_tls_writecb(int fd, short event, void *arg)
860 b0a6bcf7 2022-09-13 op struct bufferevent *bufev = arg;
861 b0a6bcf7 2022-09-13 op struct client *clt = bufev->cbarg;
863 b0a6bcf7 2022-09-13 op short what = EVBUFFER_WRITE;
866 b0a6bcf7 2022-09-13 op if (event == EV_TIMEOUT) {
867 b0a6bcf7 2022-09-13 op what |= EVBUFFER_TIMEOUT;
871 b0a6bcf7 2022-09-13 op if (EVBUFFER_LENGTH(bufev->output)) {
872 b0a6bcf7 2022-09-13 op ret = tls_write(clt->clt_ctx,
873 b0a6bcf7 2022-09-13 op EVBUFFER_DATA(bufev->output),
874 b0a6bcf7 2022-09-13 op EVBUFFER_LENGTH(bufev->output));
875 b0a6bcf7 2022-09-13 op if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) {
877 b0a6bcf7 2022-09-13 op } else if (ret == -1) {
878 b0a6bcf7 2022-09-13 op what |= EVBUFFER_ERROR;
882 b0a6bcf7 2022-09-13 op evbuffer_drain(bufev->output, len);
885 b0a6bcf7 2022-09-13 op if (EVBUFFER_LENGTH(bufev->output) != 0)
886 b0a6bcf7 2022-09-13 op proxy_bufferevent_add(&bufev->ev_write, bufev->timeout_write);
888 b0a6bcf7 2022-09-13 op if (bufev->writecb != NULL &&
889 b0a6bcf7 2022-09-13 op EVBUFFER_LENGTH(bufev->output) <= bufev->wm_write.low)
890 b0a6bcf7 2022-09-13 op (*bufev->writecb)(bufev, bufev->cbarg);
894 b0a6bcf7 2022-09-13 op proxy_bufferevent_add(&bufev->ev_write, bufev->timeout_write);
898 b0a6bcf7 2022-09-13 op (*bufev->errorcb)(bufev, what, bufev->cbarg);
902 b0a6bcf7 2022-09-13 op proxy_client_free(struct client *clt)
904 b0a6bcf7 2022-09-13 op if (clt->clt_evasr)
905 b0a6bcf7 2022-09-13 op event_asr_abort(clt->clt_evasr);
907 b0a6bcf7 2022-09-13 op if (clt->clt_addrinfo)
908 b0a6bcf7 2022-09-13 op freeaddrinfo(clt->clt_addrinfo);
910 b0a6bcf7 2022-09-13 op if (clt->clt_evconn_live)
911 b0a6bcf7 2022-09-13 op event_del(&clt->clt_evconn);
913 b0a6bcf7 2022-09-13 op if (clt->clt_fd != -1)
914 b0a6bcf7 2022-09-13 op close(clt->clt_fd);
916 b0a6bcf7 2022-09-13 op if (clt->clt_ctx)
917 b0a6bcf7 2022-09-13 op tls_free(clt->clt_ctx);
919 b0a6bcf7 2022-09-13 op if (clt->clt_bev)
920 b0a6bcf7 2022-09-13 op bufferevent_free(clt->clt_bev);
922 bff58270 2022-09-19 op free(clt->clt_tp);
923 b0a6bcf7 2022-09-13 op free(clt->clt_server_name);
924 b0a6bcf7 2022-09-13 op free(clt->clt_script_name);
925 b0a6bcf7 2022-09-13 op free(clt->clt_path_info);