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 5163fbe9 2022-09-20 op int proxy_start_reply(struct client *, int, const char *);
62 b0a6bcf7 2022-09-13 op void proxy_read(struct bufferevent *, void *);
63 b0a6bcf7 2022-09-13 op void proxy_write(struct bufferevent *, void *);
64 b0a6bcf7 2022-09-13 op void proxy_error(struct bufferevent *, short, void *);
65 b0a6bcf7 2022-09-13 op int proxy_bufferevent_add(struct event *, int);
66 b0a6bcf7 2022-09-13 op void proxy_tls_writecb(int, short, void *);
67 b0a6bcf7 2022-09-13 op void proxy_tls_readcb(int, short, void *);
69 b0a6bcf7 2022-09-13 op static struct privsep_proc procs[] = {
70 b0a6bcf7 2022-09-13 op { "parent", PROC_PARENT, proxy_dispatch_parent },
73 b0a6bcf7 2022-09-13 op volatile int proxy_clients;
74 b0a6bcf7 2022-09-13 op volatile int proxy_inflight;
75 b0a6bcf7 2022-09-13 op uint32_t proxy_fcg_id;
78 b0a6bcf7 2022-09-13 op proxy(struct privsep *ps, struct privsep_proc *p)
80 b0a6bcf7 2022-09-13 op proc_run(ps, p, procs, nitems(procs), proxy_init, NULL);
84 b0a6bcf7 2022-09-13 op proxy_init(struct privsep *ps, struct privsep_proc *p, void *arg)
86 b0a6bcf7 2022-09-13 op if (config_init(ps->ps_env) == -1)
87 b0a6bcf7 2022-09-13 op fatal("failed to initialize configuration");
89 b0a6bcf7 2022-09-13 op /* We use a custom shutdown callback */
90 b0a6bcf7 2022-09-13 op /* p->p_shutdown = proxy_shutdown */
92 b0a6bcf7 2022-09-13 op if (pledge("stdio recvfd unix inet dns", NULL) == -1)
93 b0a6bcf7 2022-09-13 op fatal("pledge");
97 b0a6bcf7 2022-09-13 op proxy_launch(struct galileo *env)
99 b0a6bcf7 2022-09-13 op event_add(&env->sc_evsock, NULL);
104 40f762b2 2022-09-23 op proxy_purge(struct proxy *pr)
110 b0a6bcf7 2022-09-13 op proxy_inflight_dec(const char *why)
112 b0a6bcf7 2022-09-13 op proxy_inflight--;
113 b0a6bcf7 2022-09-13 op log_debug("%s: inflight decremented, now %d, %s",
114 b0a6bcf7 2022-09-13 op __func__, proxy_inflight, why);
118 b0a6bcf7 2022-09-13 op proxy_dispatch_parent(int fd, struct privsep_proc *p, struct imsg *imsg)
120 b0a6bcf7 2022-09-13 op struct privsep *ps = p->p_ps;
121 b0a6bcf7 2022-09-13 op struct galileo *env = ps->ps_env;
123 b0a6bcf7 2022-09-13 op switch (imsg->hdr.type) {
124 b0a6bcf7 2022-09-13 op case IMSG_CFG_SRV:
125 afb86b2c 2022-09-23 op if (config_getproxy(env, imsg) == -1)
126 b0a6bcf7 2022-09-13 op fatal("config_getproxy");
128 b0a6bcf7 2022-09-13 op case IMSG_CFG_SOCK:
129 b0a6bcf7 2022-09-13 op /* XXX: improve */
131 b0a6bcf7 2022-09-13 op env->sc_sock_fd = config_getsock(env, imsg);
132 b0a6bcf7 2022-09-13 op if (env->sc_sock_fd == -1)
133 b0a6bcf7 2022-09-13 op fatal("config_getsock");
135 b0a6bcf7 2022-09-13 op event_set(&env->sc_evsock, env->sc_sock_fd,
136 ea8874f1 2022-09-13 op EV_READ | EV_PERSIST, fcgi_accept, env);
137 ea8874f1 2022-09-13 op evtimer_set(&env->sc_evpause, fcgi_accept, env);
139 b0a6bcf7 2022-09-13 op case IMSG_CFG_DONE:
140 40f762b2 2022-09-23 op config_getcfg(env, imsg);
141 40f762b2 2022-09-23 op proxy_launch(env);
143 b0a6bcf7 2022-09-13 op case IMSG_CTL_START:
145 40f762b2 2022-09-23 op case IMSG_CTL_RESET:
146 40f762b2 2022-09-23 op config_getreset(env, imsg);
156 c9dc4bc6 2022-09-13 op gemtext_translate_line(struct client *clt, char *line)
158 c9dc4bc6 2022-09-13 op /* preformatted line / closing */
159 b9de0a74 2022-09-14 op if (clt->clt_translate & TR_PRE) {
160 c9dc4bc6 2022-09-13 op if (!strncmp(line, "```", 3)) {
161 b9de0a74 2022-09-14 op clt->clt_translate &= ~TR_PRE;
162 c9dc4bc6 2022-09-13 op return (clt_puts(clt, "</pre>"));
165 df2db214 2022-09-19 op if (tp_htmlescape(clt->clt_tp, line) == -1)
167 c9dc4bc6 2022-09-13 op return (clt_putc(clt, '\n'));
171 b9de0a74 2022-09-14 op if (!strncmp(line, "* ", 2)) {
172 b9de0a74 2022-09-14 op if (clt->clt_translate & TR_NAV) {
173 b9de0a74 2022-09-14 op if (clt_puts(clt, "</ul></nav>") == -1)
175 b9de0a74 2022-09-14 op clt->clt_translate &= ~TR_NAV;
178 b9de0a74 2022-09-14 op if (!(clt->clt_translate & TR_LIST)) {
179 b9de0a74 2022-09-14 op if (clt_puts(clt, "<ul>") == -1)
181 b9de0a74 2022-09-14 op clt->clt_translate |= TR_LIST;
184 b9de0a74 2022-09-14 op if (clt_puts(clt, "<li>") == -1 ||
185 df2db214 2022-09-19 op tp_htmlescape(clt->clt_tp, line + 2) == -1 ||
186 b9de0a74 2022-09-14 op clt_puts(clt, "</li>") == -1)
191 b9de0a74 2022-09-14 op if (clt->clt_translate & TR_LIST) {
192 b9de0a74 2022-09-14 op if (clt_puts(clt, "</ul>") == -1)
194 b9de0a74 2022-09-14 op clt->clt_translate &= ~TR_LIST;
197 b9de0a74 2022-09-14 op /* link -- TODO: relativify from SCRIPT_NAME */
198 b9de0a74 2022-09-14 op if (!strncmp(line, "=>", 2)) {
202 b9de0a74 2022-09-14 op line += strspn(line, " \t");
204 b9de0a74 2022-09-14 op label = line + strcspn(line, " \t");
205 b9de0a74 2022-09-14 op if (*label == '\0')
206 b9de0a74 2022-09-14 op label = line;
208 b9de0a74 2022-09-14 op *label++ = '\0';
210 33f4bf26 2022-09-14 op if (fnmatch("*.jpg", line, 0) == 0 ||
211 33f4bf26 2022-09-14 op fnmatch("*.jpeg", line, 0) == 0 ||
212 33f4bf26 2022-09-14 op fnmatch("*.gif", line, 0) == 0 ||
213 33f4bf26 2022-09-14 op fnmatch("*.png", line, 0) == 0 ||
214 33f4bf26 2022-09-14 op fnmatch("*.svg", line, 0) == 0 ||
215 33f4bf26 2022-09-14 op fnmatch("*.webp", line, 0) == 0) {
216 33f4bf26 2022-09-14 op if (clt->clt_translate & TR_NAV) {
217 33f4bf26 2022-09-14 op if (clt_puts(clt, "</ul></nav>") == -1)
219 33f4bf26 2022-09-14 op clt->clt_translate &= ~TR_NAV;
222 bff58270 2022-09-19 op if (tp_figure(clt->clt_tp, line, label) == -1)
228 33f4bf26 2022-09-14 op if (!(clt->clt_translate & TR_NAV)) {
229 33f4bf26 2022-09-14 op if (clt_puts(clt, "<nav><ul>") == -1)
231 33f4bf26 2022-09-14 op clt->clt_translate |= TR_NAV;
234 acc266fe 2022-09-19 op if (clt_puts(clt, "<li><a href='") == -1)
237 acc266fe 2022-09-19 op /* XXX: do proper parsing */
238 acc266fe 2022-09-19 op if (*line == '/' || strstr(line, "//") == NULL) {
239 acc266fe 2022-09-19 op if (tp_urlescape(clt->clt_tp,
240 acc266fe 2022-09-19 op clt->clt_script_name) == -1)
243 acc266fe 2022-09-19 op /* skip the first / */
247 acc266fe 2022-09-19 op if (tp_urlescape(clt->clt_tp, line) == -1 ||
248 b9de0a74 2022-09-14 op clt_puts(clt, "'>") == -1 ||
249 df2db214 2022-09-19 op tp_htmlescape(clt->clt_tp, label) == -1 ||
250 b9de0a74 2022-09-14 op clt_puts(clt, "</a></li>") == -1)
256 b9de0a74 2022-09-14 op if (clt->clt_translate & TR_NAV) {
257 b9de0a74 2022-09-14 op if (clt_puts(clt, "</ul></nav>") == -1)
259 b9de0a74 2022-09-14 op clt->clt_translate &= ~TR_NAV;
262 c9dc4bc6 2022-09-13 op /* pre opening */
263 c9dc4bc6 2022-09-13 op if (!strncmp(line, "```", 3)) {
264 b9de0a74 2022-09-14 op clt->clt_translate |= TR_PRE;
265 c9dc4bc6 2022-09-13 op return (clt_puts(clt, "<pre>"));
268 c9dc4bc6 2022-09-13 op /* citation block */
269 c9dc4bc6 2022-09-13 op if (*line == '>') {
270 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<blockquote>") == -1 ||
271 df2db214 2022-09-19 op tp_htmlescape(clt->clt_tp, line + 1) == -1 ||
272 c9dc4bc6 2022-09-13 op clt_puts(clt, "</blockquote>") == -1)
277 c9dc4bc6 2022-09-13 op /* headings */
278 c9dc4bc6 2022-09-13 op if (!strncmp(line, "###", 3)) {
279 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<h3>") == -1 ||
280 df2db214 2022-09-19 op tp_htmlescape(clt->clt_tp, line + 3) == -1 ||
281 c9dc4bc6 2022-09-13 op clt_puts(clt, "</h3>") == -1)
285 c9dc4bc6 2022-09-13 op if (!strncmp(line, "##", 2)) {
286 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<h2>") == -1 ||
287 df2db214 2022-09-19 op tp_htmlescape(clt->clt_tp, line + 2) == -1 ||
288 c9dc4bc6 2022-09-13 op clt_puts(clt, "</h2>") == -1)
292 c9dc4bc6 2022-09-13 op if (!strncmp(line, "#", 1)) {
293 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<h1>") == -1 ||
294 df2db214 2022-09-19 op tp_htmlescape(clt->clt_tp, line + 1) == -1 ||
295 c9dc4bc6 2022-09-13 op clt_puts(clt, "</h1>") == -1)
300 df5279ca 2022-09-14 op /* Not following strictly the gemini specification... */
301 df5279ca 2022-09-14 op if (*line == '\0')
304 c9dc4bc6 2022-09-13 op /* paragraph */
305 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<p>") == -1 ||
306 df2db214 2022-09-19 op tp_htmlescape(clt->clt_tp, line) == -1 ||
307 c9dc4bc6 2022-09-13 op clt_puts(clt, "</p>") == -1)
314 c9dc4bc6 2022-09-13 op proxy_translate_gemtext(struct client *clt)
316 c9dc4bc6 2022-09-13 op struct bufferevent *bev = clt->clt_bev;
317 c9dc4bc6 2022-09-13 op struct evbuffer *src = EVBUFFER_INPUT(bev);
323 b9de0a74 2022-09-14 op line = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF);
324 c9dc4bc6 2022-09-13 op if (line == NULL)
327 c9dc4bc6 2022-09-13 op r = gemtext_translate_line(clt, line);
334 f774ad1e 2022-09-23 op struct proxy_config *
335 f774ad1e 2022-09-23 op proxy_match(struct galileo *env, const char *name)
337 afb86b2c 2022-09-23 op struct proxy *pr;
339 f774ad1e 2022-09-23 op if (name == NULL)
342 afb86b2c 2022-09-23 op TAILQ_FOREACH(pr, &env->sc_proxies, pr_entry) {
343 f774ad1e 2022-09-23 op if (!strcmp(name, pr->pr_conf.host))
344 afb86b2c 2022-09-23 op return &pr->pr_conf;
351 b0a6bcf7 2022-09-13 op proxy_start_request(struct galileo *env, struct client *clt)
353 b0a6bcf7 2022-09-13 op struct addrinfo hints;
354 b0a6bcf7 2022-09-13 op struct asr_query *query;
358 f774ad1e 2022-09-23 op if ((clt->clt_pc = proxy_match(env, clt->clt_server_name)) == NULL) {
359 e3c1cbab 2022-09-20 op if (proxy_start_reply(clt, 501, "text/html") == -1)
361 abe17781 2022-09-20 op if (tp_error(clt->clt_tp, -1, "unknown server") == -1)
363 8857131d 2022-09-20 op return (fcgi_end_request(clt, 1));
366 8857131d 2022-09-20 op if (clt->clt_bodylen != 0 && clt->clt_body == NULL) {
367 8857131d 2022-09-20 op if (proxy_start_reply(clt, 400, "text/html") == -1)
369 8857131d 2022-09-20 op if (tp_error(clt->clt_tp, -1, "bad request") == -1)
371 8857131d 2022-09-20 op return (fcgi_end_request(clt, 1));
374 8857131d 2022-09-20 op if (clt->clt_body) {
375 8857131d 2022-09-20 op r = asprintf(&url, "%s%s?%s", clt->clt_script_name,
376 8857131d 2022-09-20 op clt->clt_path_info + 1, clt->clt_body);
378 8857131d 2022-09-20 op return (fcgi_end_request(clt, 1));
380 8857131d 2022-09-20 op if (proxy_start_reply(clt, 302, url) == -1 ||
381 8857131d 2022-09-20 op fcgi_end_request(clt, 1) == -1) {
389 b0a6bcf7 2022-09-13 op memset(&hints, 0, sizeof(hints));
390 b0a6bcf7 2022-09-13 op hints.ai_family = AF_UNSPEC;
391 b0a6bcf7 2022-09-13 op hints.ai_socktype = SOCK_STREAM;
393 26cd3e9d 2022-09-23 op query = getaddrinfo_async(clt->clt_pc->proxy_addr,
394 26cd3e9d 2022-09-23 op clt->clt_pc->proxy_port, &hints, NULL);
395 b0a6bcf7 2022-09-13 op if (query == NULL) {
396 b0a6bcf7 2022-09-13 op log_warn("getaddrinfo_async");
397 8857131d 2022-09-20 op return (fcgi_abort_request(clt));
400 b0a6bcf7 2022-09-13 op clt->clt_evasr = event_asr_run(query, proxy_resolved, clt);
401 b0a6bcf7 2022-09-13 op if (clt->clt_evasr == NULL) {
402 b0a6bcf7 2022-09-13 op log_warn("event_asr_run");
403 b0a6bcf7 2022-09-13 op asr_abort(query);
404 8857131d 2022-09-20 op return (fcgi_abort_request(clt));
411 b0a6bcf7 2022-09-13 op proxy_resolved(struct asr_result *res, void *d)
413 b0a6bcf7 2022-09-13 op struct client *clt = d;
414 b0a6bcf7 2022-09-13 op struct proxy_config *pc = clt->clt_pc;
416 b0a6bcf7 2022-09-13 op clt->clt_evasr = NULL;
418 b0a6bcf7 2022-09-13 op if (res->ar_gai_errno != 0) {
419 26cd3e9d 2022-09-23 op log_warnx("failed to resolve %s:%s: %s",
420 b0a6bcf7 2022-09-13 op pc->proxy_addr, pc->proxy_port,
421 b0a6bcf7 2022-09-13 op gai_strerror(res->ar_gai_errno));
422 e3c1cbab 2022-09-20 op if (proxy_start_reply(clt, 501, "text/html") == -1)
424 abe17781 2022-09-20 op if (tp_error(clt->clt_tp, -1, "Can't resolve host") == -1)
426 b0a6bcf7 2022-09-13 op fcgi_end_request(clt, 1);
430 b0a6bcf7 2022-09-13 op clt->clt_addrinfo = res->ar_addrinfo;
431 b0a6bcf7 2022-09-13 op clt->clt_p = clt->clt_addrinfo;
432 b0a6bcf7 2022-09-13 op proxy_connect(-1, 0, clt);
436 b0a6bcf7 2022-09-13 op proxy_connect(int fd, short ev, void *d)
438 b0a6bcf7 2022-09-13 op struct client *clt = d;
439 b0a6bcf7 2022-09-13 op struct evbuffer *out;
440 b0a6bcf7 2022-09-13 op struct addrinfo *p;
441 b0a6bcf7 2022-09-13 op struct tls_config *conf;
442 b0a6bcf7 2022-09-13 op struct timeval conntv = {5, 0};
444 b0a6bcf7 2022-09-13 op socklen_t len = sizeof(err);
447 b0a6bcf7 2022-09-13 op if (clt->clt_p == NULL)
450 b0a6bcf7 2022-09-13 op if (clt->clt_fd != -1) {
451 b0a6bcf7 2022-09-13 op if (getsockopt(clt->clt_fd, SOL_SOCKET, SO_ERROR, &err, &len)
454 b0a6bcf7 2022-09-13 op if (err != 0) {
461 b0a6bcf7 2022-09-13 op p = clt->clt_p;
462 b0a6bcf7 2022-09-13 op clt->clt_fd = socket(p->ai_family, p->ai_socktype | SOCK_NONBLOCK,
463 b0a6bcf7 2022-09-13 op p->ai_protocol);
464 b0a6bcf7 2022-09-13 op if (clt->clt_fd == -1) {
465 b0a6bcf7 2022-09-13 op clt->clt_p = clt->clt_p->ai_next;
469 b0a6bcf7 2022-09-13 op if (connect(clt->clt_fd, p->ai_addr, p->ai_addrlen) == 0)
472 b0a6bcf7 2022-09-13 op clt->clt_evconn_live = 1;
473 b0a6bcf7 2022-09-13 op event_set(&clt->clt_evconn, clt->clt_fd, EV_WRITE, proxy_connect, clt);
474 b0a6bcf7 2022-09-13 op event_add(&clt->clt_evconn, &conntv);
478 b0a6bcf7 2022-09-13 op clt->clt_evconn_live = 0;
479 b0a6bcf7 2022-09-13 op freeaddrinfo(clt->clt_addrinfo);
480 b0a6bcf7 2022-09-13 op clt->clt_addrinfo = clt->clt_p = NULL;
482 b0a6bcf7 2022-09-13 op /* initialize TLS for Gemini */
483 b0a6bcf7 2022-09-13 op if ((conf = tls_config_new()) == NULL) {
484 b0a6bcf7 2022-09-13 op log_warn("tls_config_new failed");
488 b0a6bcf7 2022-09-13 op tls_config_insecure_noverifycert(conf);
490 b0a6bcf7 2022-09-13 op if ((clt->clt_ctx = tls_client()) == NULL) {
491 b0a6bcf7 2022-09-13 op log_warnx("tls_client failed");
492 b0a6bcf7 2022-09-13 op tls_config_free(conf);
496 b0a6bcf7 2022-09-13 op if (tls_configure(clt->clt_ctx, conf) == -1) {
497 b0a6bcf7 2022-09-13 op log_warnx("tls_configure failed");
498 b0a6bcf7 2022-09-13 op tls_config_free(conf);
502 b0a6bcf7 2022-09-13 op tls_config_free(conf);
504 b0a6bcf7 2022-09-13 op if (tls_connect_socket(clt->clt_ctx, clt->clt_fd,
505 b0a6bcf7 2022-09-13 op clt->clt_pc->proxy_name) == -1) {
506 b0a6bcf7 2022-09-13 op log_warnx("tls_connect_socket failed");
510 b0a6bcf7 2022-09-13 op clt->clt_bev = bufferevent_new(clt->clt_fd, proxy_read, proxy_write,
511 b0a6bcf7 2022-09-13 op proxy_error, clt);
512 b0a6bcf7 2022-09-13 op if (clt->clt_bev == NULL) {
513 b0a6bcf7 2022-09-13 op log_warn("bufferevent_new");
516 b0a6bcf7 2022-09-13 op out = EVBUFFER_OUTPUT(clt->clt_bev);
518 b0a6bcf7 2022-09-13 op event_set(&clt->clt_bev->ev_read, clt->clt_fd, EV_READ,
519 b0a6bcf7 2022-09-13 op proxy_tls_readcb, clt->clt_bev);
520 b0a6bcf7 2022-09-13 op event_set(&clt->clt_bev->ev_write, clt->clt_fd, EV_WRITE,
521 b0a6bcf7 2022-09-13 op proxy_tls_writecb, clt->clt_bev);
523 b0a6bcf7 2022-09-13 op /* bufferevent_settimeout(); */
524 b0a6bcf7 2022-09-13 op bufferevent_enable(clt->clt_bev, EV_READ|EV_WRITE);
526 b0a6bcf7 2022-09-13 op /* TODO: compute the URL */
527 28239bac 2022-09-20 op if (evbuffer_add_printf(out, "gemini://%s/%s",
528 ee80262d 2022-09-13 op clt->clt_pc->proxy_name, clt->clt_path_info) == -1) {
529 28239bac 2022-09-20 op log_warn("bufferevent_printf failed");
533 28239bac 2022-09-20 op if (clt->clt_query &&
534 28239bac 2022-09-20 op evbuffer_add_printf(out, "?%s", clt->clt_query) == -1) {
535 b0a6bcf7 2022-09-13 op log_warn("bufferevent_printf failed");
539 28239bac 2022-09-20 op if (evbuffer_add(out, "\r\n", 2) == -1) {
540 28239bac 2022-09-20 op log_warn("bufferevent_add failed");
547 26cd3e9d 2022-09-23 op log_warn("failed to connect to %s:%s",
548 b0a6bcf7 2022-09-13 op clt->clt_pc->proxy_addr, clt->clt_pc->proxy_port);
549 e3c1cbab 2022-09-20 op if (proxy_start_reply(clt, 501, "text/html") == -1)
551 abe17781 2022-09-20 op if (tp_error(clt->clt_tp, -1, "Can't connect") == -1)
553 b0a6bcf7 2022-09-13 op fcgi_end_request(clt, 1);
556 6edd9a00 2022-09-14 op static inline int
557 6edd9a00 2022-09-14 op parse_mime(struct client *clt, char *mime, char *lang, size_t len)
559 6edd9a00 2022-09-14 op char *t, *semi;
561 6edd9a00 2022-09-14 op if (strncmp(mime, "text/gemini", 11) != 0)
564 6edd9a00 2022-09-14 op clt->clt_translate = TR_ENABLED;
566 6edd9a00 2022-09-14 op if ((mime = strchr(mime, ';')) == NULL)
569 6edd9a00 2022-09-14 op *mime++ = '\0';
570 6edd9a00 2022-09-14 op while ((t = strsep(&mime, ";")) != NULL) {
571 6edd9a00 2022-09-14 op if (!strncmp(t, "charset=", 8)) {
573 6edd9a00 2022-09-14 op if (!strncasecmp(t, "utf8", 4) ||
574 8ab2d60e 2022-09-14 op !strncasecmp(t, "utf-8", 5) ||
575 6edd9a00 2022-09-14 op !strncasecmp(t, "ascii", 5)) {
576 6edd9a00 2022-09-14 op log_debug("unknown charset %s", t);
582 6edd9a00 2022-09-14 op if (!strncmp(t, "lang=", 5)) {
584 6edd9a00 2022-09-14 op if ((semi = strchr(t, ';')) != NULL)
585 6edd9a00 2022-09-14 op *semi = '\0';
587 6edd9a00 2022-09-14 op if (strlcpy(lang, t, len) >= len) {
588 6edd9a00 2022-09-14 op log_debug("lang too long: %s", t);
589 6edd9a00 2022-09-14 op *lang = '\0';
602 5163fbe9 2022-09-20 op proxy_start_reply(struct client *clt, int status, const char *ctype)
604 5163fbe9 2022-09-20 op const char *csp;
606 5163fbe9 2022-09-20 op csp = "Content-Security-Policy: default-src 'self'; "
607 5163fbe9 2022-09-20 op "script-src 'none'; object-src 'none';\r\n";
609 5163fbe9 2022-09-20 op if (status != 200 &&
610 2df73ca5 2022-09-20 op clt_printf(clt, "Status: %d\r\n", status) == -1)
613 2df73ca5 2022-09-20 op if (clt_puts(clt, csp) == -1)
616 8857131d 2022-09-20 op if (status == 302) {
617 8857131d 2022-09-20 op /* use "ctype" as redirect target */
618 8857131d 2022-09-20 op if (clt_printf(clt, "Location: %s\r\n", ctype) == -1)
620 8857131d 2022-09-20 op if (clt_puts(clt, "\r\n") == -1)
625 8857131d 2022-09-20 op if (ctype != NULL) {
626 8857131d 2022-09-20 op if (!strcmp(ctype, "text/html"))
627 8857131d 2022-09-20 op ctype = "text/html;charset=utf-8";
628 8857131d 2022-09-20 op if (clt_printf(clt, "Content-Type: %s\r\n", ctype)
633 5163fbe9 2022-09-20 op if (clt_puts(clt, "\r\n") == -1)
640 b0a6bcf7 2022-09-13 op proxy_read(struct bufferevent *bev, void *d)
642 b0a6bcf7 2022-09-13 op struct client *clt = d;
643 b0a6bcf7 2022-09-13 op struct evbuffer *src = EVBUFFER_INPUT(bev);
644 c9dc4bc6 2022-09-13 op const char *ctype;
645 6edd9a00 2022-09-14 op char lang[16];
646 6edd9a00 2022-09-14 op char *hdr, *mime;
650 b0a6bcf7 2022-09-13 op if (clt->clt_headersdone) {
651 c9dc4bc6 2022-09-13 op if (clt->clt_translate)
652 c9dc4bc6 2022-09-13 op proxy_translate_gemtext(clt);
654 c9dc4bc6 2022-09-13 op clt_write_bufferevent(clt, bev);
658 b0a6bcf7 2022-09-13 op hdr = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF_STRICT);
659 b0a6bcf7 2022-09-13 op if (hdr == NULL) {
660 b0a6bcf7 2022-09-13 op if (EVBUFFER_LENGTH(src) >= 1026)
661 b0a6bcf7 2022-09-13 op proxy_error(bev, EV_READ, clt);
665 b0a6bcf7 2022-09-13 op if (len < 4 ||
666 b0a6bcf7 2022-09-13 op !isdigit((unsigned char)hdr[0]) ||
667 b0a6bcf7 2022-09-13 op !isdigit((unsigned char)hdr[1]) ||
668 b0a6bcf7 2022-09-13 op hdr[2] != ' ') {
669 b0a6bcf7 2022-09-13 op log_warnx("invalid ");
670 b0a6bcf7 2022-09-13 op proxy_error(bev, EV_READ, clt);
674 abe17781 2022-09-20 op code = (hdr[0] - '0') * 10 + (hdr[1] - '0');
676 6e8f426e 2022-09-14 op switch (hdr[0]) {
678 8857131d 2022-09-20 op if (proxy_start_reply(clt, 200, "text/html") == -1)
680 8857131d 2022-09-20 op if (tp_inputpage(clt->clt_tp, &hdr[3]) == -1)
682 8857131d 2022-09-20 op fcgi_end_request(clt, 0);
685 6e8f426e 2022-09-14 op /* handled below */
688 b4f7fe4f 2022-09-21 op /* XXX: do proper parsing */
689 b4f7fe4f 2022-09-21 op if (hdr[3] == '/' || strstr(&hdr[3], "//") == NULL) {
692 b4f7fe4f 2022-09-21 op if (asprintf(&url, "%s%s", clt->clt_script_name,
693 b4f7fe4f 2022-09-21 op &hdr[3]) == -1)
696 b4f7fe4f 2022-09-21 op if (proxy_start_reply(clt, 302, url)) {
701 b4f7fe4f 2022-09-21 op fcgi_end_request(clt, 0);
704 b4f7fe4f 2022-09-21 op /* fallback */
706 e3c1cbab 2022-09-20 op if (proxy_start_reply(clt, 501, "text/html") == -1)
708 abe17781 2022-09-20 op if (tp_error(clt->clt_tp, code, &hdr[3]) == -1)
710 6e8f426e 2022-09-14 op fcgi_end_request(clt, 1);
714 6edd9a00 2022-09-14 op mime = hdr + 2 + strspn(hdr + 2, " \t");
715 6edd9a00 2022-09-14 op if (parse_mime(clt, mime, lang, sizeof(lang)) == -1) {
716 e3c1cbab 2022-09-20 op if (proxy_start_reply(clt, 501, "text/html") == -1)
718 abe17781 2022-09-20 op if (tp_error(clt->clt_tp, -1, "Bad response") == -1)
720 6edd9a00 2022-09-14 op fcgi_end_request(clt, 1);
724 232eee45 2022-09-20 op if (clt->clt_translate)
725 8ab2d60e 2022-09-14 op ctype = "text/html;charset=utf-8";
727 6edd9a00 2022-09-14 op ctype = mime;
729 6edd9a00 2022-09-14 op if (clt_printf(clt, "Content-Type: %s\r\n\r\n", ctype) == -1)
732 b0a6bcf7 2022-09-13 op clt->clt_headersdone = 1;
734 bff58270 2022-09-19 op if (clt->clt_translate &&
735 e3c1cbab 2022-09-20 op tp_head(clt->clt_tp, lang, NULL) == -1)
739 1337dc2b 2022-09-14 op * Trigger the read again so we proceed with the response
740 1337dc2b 2022-09-14 op * body, if any.
743 1337dc2b 2022-09-14 op proxy_read(bev, d);
751 b0a6bcf7 2022-09-13 op proxy_write(struct bufferevent *bev, void *d)
757 b0a6bcf7 2022-09-13 op proxy_error(struct bufferevent *bev, short err, void *d)
759 b0a6bcf7 2022-09-13 op struct client *clt = d;
760 b0a6bcf7 2022-09-13 op int status = !(err & EVBUFFER_EOF);
762 b0a6bcf7 2022-09-13 op log_debug("proxy error, shutting down the connection (err: %x)",
765 b0a6bcf7 2022-09-13 op if (!clt->clt_headersdone) {
766 e3c1cbab 2022-09-20 op if (proxy_start_reply(clt, 501, "text/html") == -1)
768 abe17781 2022-09-20 op if (tp_error(clt->clt_tp, -1, "Proxy error") == -1)
770 c9dc4bc6 2022-09-13 op } else if (status == 0) {
771 c42fce9b 2022-09-14 op if (clt->clt_translate & TR_PRE) {
772 c42fce9b 2022-09-14 op if (clt_puts(clt, "</pre>"))
774 c42fce9b 2022-09-14 op clt->clt_translate &= ~TR_PRE;
777 c42fce9b 2022-09-14 op if (clt->clt_translate & TR_LIST) {
778 c42fce9b 2022-09-14 op if (clt_puts(clt, "</ul>") == -1)
780 c42fce9b 2022-09-14 op clt->clt_translate &= ~TR_LIST;
783 c42fce9b 2022-09-14 op if (clt->clt_translate & TR_NAV) {
784 c42fce9b 2022-09-14 op if (clt_puts(clt, "</ul></nav>") == -1)
786 c42fce9b 2022-09-14 op clt->clt_translate &= ~TR_NAV;
789 54acddc9 2022-09-19 op if (clt->clt_translate &&
790 54acddc9 2022-09-19 op tp_foot(clt->clt_tp) == -1)
794 b0a6bcf7 2022-09-13 op fcgi_end_request(clt, status);
798 b0a6bcf7 2022-09-13 op proxy_tls_readcb(int fd, short event, void *arg)
800 b0a6bcf7 2022-09-13 op struct bufferevent *bufev = arg;
801 b0a6bcf7 2022-09-13 op struct client *clt = bufev->cbarg;
802 b0a6bcf7 2022-09-13 op char rbuf[IBUF_READ_SIZE];
803 b0a6bcf7 2022-09-13 op int what = EVBUFFER_READ;
804 b0a6bcf7 2022-09-13 op int howmuch = IBUF_READ_SIZE;
808 b0a6bcf7 2022-09-13 op if (event == EV_TIMEOUT) {
809 b0a6bcf7 2022-09-13 op what |= EVBUFFER_TIMEOUT;
813 b0a6bcf7 2022-09-13 op if (bufev->wm_read.high != 0)
814 b0a6bcf7 2022-09-13 op howmuch = MINIMUM(sizeof(rbuf), bufev->wm_read.high);
816 b0a6bcf7 2022-09-13 op ret = tls_read(clt->clt_ctx, rbuf, howmuch);
817 b0a6bcf7 2022-09-13 op if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) {
819 b0a6bcf7 2022-09-13 op } else if (ret == -1) {
820 b0a6bcf7 2022-09-13 op what |= EVBUFFER_ERROR;
825 b0a6bcf7 2022-09-13 op if (len == 0) {
826 b0a6bcf7 2022-09-13 op what |= EVBUFFER_EOF;
830 b0a6bcf7 2022-09-13 op if (evbuffer_add(bufev->input, rbuf, len) == -1) {
831 b0a6bcf7 2022-09-13 op what |= EVBUFFER_ERROR;
835 b0a6bcf7 2022-09-13 op proxy_bufferevent_add(&bufev->ev_read, bufev->timeout_read);
837 b0a6bcf7 2022-09-13 op len = EVBUFFER_LENGTH(bufev->input);
838 b0a6bcf7 2022-09-13 op if (bufev->wm_read.low != 0 && len < bufev->wm_read.low)
840 b0a6bcf7 2022-09-13 op if (bufev->wm_read.high != 0 && len > bufev->wm_read.high) {
841 b0a6bcf7 2022-09-13 op struct evbuffer *buf = bufev->input;
842 b0a6bcf7 2022-09-13 op event_del(&bufev->ev_read);
843 b0a6bcf7 2022-09-13 op evbuffer_setcb(buf, bufferevent_read_pressure_cb, bufev);
847 b0a6bcf7 2022-09-13 op if (bufev->readcb != NULL)
848 b0a6bcf7 2022-09-13 op (*bufev->readcb)(bufev, bufev->cbarg);
852 b0a6bcf7 2022-09-13 op proxy_bufferevent_add(&bufev->ev_read, bufev->timeout_read);
856 b0a6bcf7 2022-09-13 op (*bufev->errorcb)(bufev, what, bufev->cbarg);
860 b0a6bcf7 2022-09-13 op proxy_bufferevent_add(struct event *ev, int timeout)
862 b0a6bcf7 2022-09-13 op struct timeval tv, *ptv = NULL;
864 b0a6bcf7 2022-09-13 op if (timeout) {
865 b0a6bcf7 2022-09-13 op timerclear(&tv);
866 b0a6bcf7 2022-09-13 op tv.tv_sec = timeout;
870 b0a6bcf7 2022-09-13 op return (event_add(ev, ptv));
874 b0a6bcf7 2022-09-13 op proxy_tls_writecb(int fd, short event, void *arg)
876 b0a6bcf7 2022-09-13 op struct bufferevent *bufev = arg;
877 b0a6bcf7 2022-09-13 op struct client *clt = bufev->cbarg;
879 b0a6bcf7 2022-09-13 op short what = EVBUFFER_WRITE;
882 b0a6bcf7 2022-09-13 op if (event == EV_TIMEOUT) {
883 b0a6bcf7 2022-09-13 op what |= EVBUFFER_TIMEOUT;
887 b0a6bcf7 2022-09-13 op if (EVBUFFER_LENGTH(bufev->output)) {
888 b0a6bcf7 2022-09-13 op ret = tls_write(clt->clt_ctx,
889 b0a6bcf7 2022-09-13 op EVBUFFER_DATA(bufev->output),
890 b0a6bcf7 2022-09-13 op EVBUFFER_LENGTH(bufev->output));
891 b0a6bcf7 2022-09-13 op if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) {
893 b0a6bcf7 2022-09-13 op } else if (ret == -1) {
894 b0a6bcf7 2022-09-13 op what |= EVBUFFER_ERROR;
898 b0a6bcf7 2022-09-13 op evbuffer_drain(bufev->output, len);
901 b0a6bcf7 2022-09-13 op if (EVBUFFER_LENGTH(bufev->output) != 0)
902 b0a6bcf7 2022-09-13 op proxy_bufferevent_add(&bufev->ev_write, bufev->timeout_write);
904 b0a6bcf7 2022-09-13 op if (bufev->writecb != NULL &&
905 b0a6bcf7 2022-09-13 op EVBUFFER_LENGTH(bufev->output) <= bufev->wm_write.low)
906 b0a6bcf7 2022-09-13 op (*bufev->writecb)(bufev, bufev->cbarg);
910 b0a6bcf7 2022-09-13 op proxy_bufferevent_add(&bufev->ev_write, bufev->timeout_write);
914 b0a6bcf7 2022-09-13 op (*bufev->errorcb)(bufev, what, bufev->cbarg);
918 b0a6bcf7 2022-09-13 op proxy_client_free(struct client *clt)
920 b0a6bcf7 2022-09-13 op if (clt->clt_evasr)
921 b0a6bcf7 2022-09-13 op event_asr_abort(clt->clt_evasr);
923 b0a6bcf7 2022-09-13 op if (clt->clt_addrinfo)
924 b0a6bcf7 2022-09-13 op freeaddrinfo(clt->clt_addrinfo);
926 b0a6bcf7 2022-09-13 op if (clt->clt_evconn_live)
927 b0a6bcf7 2022-09-13 op event_del(&clt->clt_evconn);
929 b0a6bcf7 2022-09-13 op if (clt->clt_fd != -1)
930 b0a6bcf7 2022-09-13 op close(clt->clt_fd);
932 b0a6bcf7 2022-09-13 op if (clt->clt_ctx)
933 b0a6bcf7 2022-09-13 op tls_free(clt->clt_ctx);
935 b0a6bcf7 2022-09-13 op if (clt->clt_bev)
936 b0a6bcf7 2022-09-13 op bufferevent_free(clt->clt_bev);
938 8857131d 2022-09-20 op free(clt->clt_body);
939 bff58270 2022-09-19 op free(clt->clt_tp);
940 b0a6bcf7 2022-09-13 op free(clt->clt_server_name);
941 b0a6bcf7 2022-09-13 op free(clt->clt_script_name);
942 b0a6bcf7 2022-09-13 op free(clt->clt_path_info);
943 28239bac 2022-09-20 op free(clt->clt_query);