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 83f0f95a 2022-09-29 op #include "config.h"
43 b0a6bcf7 2022-09-13 op #include "log.h"
44 b0a6bcf7 2022-09-13 op #include "proc.h"
45 bff58270 2022-09-19 op #include "tmpl.h"
47 b0a6bcf7 2022-09-13 op #include "galileo.h"
49 b0a6bcf7 2022-09-13 op #define MINIMUM(a, b) ((a) < (b) ? (a) : (b))
51 83f0f95a 2022-09-29 op #if HAVE_LIBEVENT2
52 83f0f95a 2022-09-29 op # define G_TOUT(t) ((t).tv_sec)
54 83f0f95a 2022-09-29 op # define G_TOUT(t) (t)
57 b0a6bcf7 2022-09-13 op /* provided by OpenBSD' base libevent but not in any header? */
58 b0a6bcf7 2022-09-13 op extern void bufferevent_read_pressure_cb(struct evbuffer *, size_t,
59 b0a6bcf7 2022-09-13 op size_t, void *);
61 b0a6bcf7 2022-09-13 op void proxy_init(struct privsep *, struct privsep_proc *, void *);
62 b0a6bcf7 2022-09-13 op int proxy_launch(struct galileo *);
63 b0a6bcf7 2022-09-13 op void proxy_inflight_dec(const char *);
64 b0a6bcf7 2022-09-13 op int proxy_dispatch_parent(int, struct privsep_proc *, struct imsg *);
65 c9dc4bc6 2022-09-13 op void proxy_translate_gemtext(struct client *);
66 b0a6bcf7 2022-09-13 op void proxy_resolved(struct asr_result *, void *);
67 b0a6bcf7 2022-09-13 op void proxy_connect(int, short, void *);
68 5163fbe9 2022-09-20 op int proxy_start_reply(struct client *, int, const char *);
69 b0a6bcf7 2022-09-13 op void proxy_read(struct bufferevent *, void *);
70 b0a6bcf7 2022-09-13 op void proxy_write(struct bufferevent *, void *);
71 b0a6bcf7 2022-09-13 op void proxy_error(struct bufferevent *, short, void *);
72 b0a6bcf7 2022-09-13 op int proxy_bufferevent_add(struct event *, int);
73 b0a6bcf7 2022-09-13 op void proxy_tls_writecb(int, short, void *);
74 b0a6bcf7 2022-09-13 op void proxy_tls_readcb(int, short, void *);
76 b0a6bcf7 2022-09-13 op static struct privsep_proc procs[] = {
77 b0a6bcf7 2022-09-13 op { "parent", PROC_PARENT, proxy_dispatch_parent },
80 b0a6bcf7 2022-09-13 op volatile int proxy_clients;
81 b0a6bcf7 2022-09-13 op volatile int proxy_inflight;
82 b0a6bcf7 2022-09-13 op uint32_t proxy_fcg_id;
85 b0a6bcf7 2022-09-13 op proxy(struct privsep *ps, struct privsep_proc *p)
87 b0a6bcf7 2022-09-13 op proc_run(ps, p, procs, nitems(procs), proxy_init, NULL);
91 b0a6bcf7 2022-09-13 op proxy_init(struct privsep *ps, struct privsep_proc *p, void *arg)
93 b0a6bcf7 2022-09-13 op if (config_init(ps->ps_env) == -1)
94 b0a6bcf7 2022-09-13 op fatal("failed to initialize configuration");
96 b0a6bcf7 2022-09-13 op /* We use a custom shutdown callback */
97 b0a6bcf7 2022-09-13 op /* p->p_shutdown = proxy_shutdown */
99 b0a6bcf7 2022-09-13 op if (pledge("stdio recvfd unix inet dns", NULL) == -1)
100 b0a6bcf7 2022-09-13 op fatal("pledge");
104 b0a6bcf7 2022-09-13 op proxy_launch(struct galileo *env)
106 b0a6bcf7 2022-09-13 op event_add(&env->sc_evsock, NULL);
111 40f762b2 2022-09-23 op proxy_purge(struct proxy *pr)
117 b0a6bcf7 2022-09-13 op proxy_inflight_dec(const char *why)
119 b0a6bcf7 2022-09-13 op proxy_inflight--;
120 b0a6bcf7 2022-09-13 op log_debug("%s: inflight decremented, now %d, %s",
121 b0a6bcf7 2022-09-13 op __func__, proxy_inflight, why);
125 b0a6bcf7 2022-09-13 op proxy_dispatch_parent(int fd, struct privsep_proc *p, struct imsg *imsg)
127 b0a6bcf7 2022-09-13 op struct privsep *ps = p->p_ps;
128 b0a6bcf7 2022-09-13 op struct galileo *env = ps->ps_env;
130 b0a6bcf7 2022-09-13 op switch (imsg->hdr.type) {
131 b0a6bcf7 2022-09-13 op case IMSG_CFG_SRV:
132 afb86b2c 2022-09-23 op if (config_getproxy(env, imsg) == -1)
133 b0a6bcf7 2022-09-13 op fatal("config_getproxy");
135 b0a6bcf7 2022-09-13 op case IMSG_CFG_SOCK:
136 b0a6bcf7 2022-09-13 op /* XXX: improve */
138 b0a6bcf7 2022-09-13 op env->sc_sock_fd = config_getsock(env, imsg);
139 b0a6bcf7 2022-09-13 op if (env->sc_sock_fd == -1)
140 b0a6bcf7 2022-09-13 op fatal("config_getsock");
142 b0a6bcf7 2022-09-13 op event_set(&env->sc_evsock, env->sc_sock_fd,
143 ea8874f1 2022-09-13 op EV_READ | EV_PERSIST, fcgi_accept, env);
144 ea8874f1 2022-09-13 op evtimer_set(&env->sc_evpause, fcgi_accept, env);
146 b0a6bcf7 2022-09-13 op case IMSG_CFG_DONE:
147 40f762b2 2022-09-23 op config_getcfg(env, imsg);
148 40f762b2 2022-09-23 op proxy_launch(env);
150 b0a6bcf7 2022-09-13 op case IMSG_CTL_START:
152 40f762b2 2022-09-23 op case IMSG_CTL_RESET:
153 40f762b2 2022-09-23 op config_getreset(env, imsg);
163 c9dc4bc6 2022-09-13 op gemtext_translate_line(struct client *clt, char *line)
165 c9dc4bc6 2022-09-13 op /* preformatted line / closing */
166 b9de0a74 2022-09-14 op if (clt->clt_translate & TR_PRE) {
167 c9dc4bc6 2022-09-13 op if (!strncmp(line, "```", 3)) {
168 b9de0a74 2022-09-14 op clt->clt_translate &= ~TR_PRE;
169 ceb3f79c 2022-09-29 op return (tp_pre_close(clt->clt_tp));
172 df2db214 2022-09-19 op if (tp_htmlescape(clt->clt_tp, line) == -1)
174 c9dc4bc6 2022-09-13 op return (clt_putc(clt, '\n'));
178 b9de0a74 2022-09-14 op if (!strncmp(line, "* ", 2)) {
179 b9de0a74 2022-09-14 op if (clt->clt_translate & TR_NAV) {
180 b9de0a74 2022-09-14 op if (clt_puts(clt, "</ul></nav>") == -1)
182 b9de0a74 2022-09-14 op clt->clt_translate &= ~TR_NAV;
185 b9de0a74 2022-09-14 op if (!(clt->clt_translate & TR_LIST)) {
186 b9de0a74 2022-09-14 op if (clt_puts(clt, "<ul>") == -1)
188 b9de0a74 2022-09-14 op clt->clt_translate |= TR_LIST;
191 b9de0a74 2022-09-14 op if (clt_puts(clt, "<li>") == -1 ||
192 df2db214 2022-09-19 op tp_htmlescape(clt->clt_tp, line + 2) == -1 ||
193 b9de0a74 2022-09-14 op clt_puts(clt, "</li>") == -1)
198 b9de0a74 2022-09-14 op if (clt->clt_translate & TR_LIST) {
199 b9de0a74 2022-09-14 op if (clt_puts(clt, "</ul>") == -1)
201 b9de0a74 2022-09-14 op clt->clt_translate &= ~TR_LIST;
204 b9de0a74 2022-09-14 op /* link -- TODO: relativify from SCRIPT_NAME */
205 b9de0a74 2022-09-14 op if (!strncmp(line, "=>", 2)) {
209 b9de0a74 2022-09-14 op line += strspn(line, " \t");
211 b9de0a74 2022-09-14 op label = line + strcspn(line, " \t");
212 b9de0a74 2022-09-14 op if (*label == '\0')
213 b9de0a74 2022-09-14 op label = line;
215 b9de0a74 2022-09-14 op *label++ = '\0';
217 33f4bf26 2022-09-14 op if (fnmatch("*.jpg", line, 0) == 0 ||
218 33f4bf26 2022-09-14 op fnmatch("*.jpeg", line, 0) == 0 ||
219 33f4bf26 2022-09-14 op fnmatch("*.gif", line, 0) == 0 ||
220 33f4bf26 2022-09-14 op fnmatch("*.png", line, 0) == 0 ||
221 33f4bf26 2022-09-14 op fnmatch("*.svg", line, 0) == 0 ||
222 33f4bf26 2022-09-14 op fnmatch("*.webp", line, 0) == 0) {
223 33f4bf26 2022-09-14 op if (clt->clt_translate & TR_NAV) {
224 33f4bf26 2022-09-14 op if (clt_puts(clt, "</ul></nav>") == -1)
226 33f4bf26 2022-09-14 op clt->clt_translate &= ~TR_NAV;
229 bff58270 2022-09-19 op if (tp_figure(clt->clt_tp, line, label) == -1)
235 33f4bf26 2022-09-14 op if (!(clt->clt_translate & TR_NAV)) {
236 33f4bf26 2022-09-14 op if (clt_puts(clt, "<nav><ul>") == -1)
238 33f4bf26 2022-09-14 op clt->clt_translate |= TR_NAV;
241 acc266fe 2022-09-19 op if (clt_puts(clt, "<li><a href='") == -1)
244 acc266fe 2022-09-19 op /* XXX: do proper parsing */
245 acc266fe 2022-09-19 op if (*line == '/' || strstr(line, "//") == NULL) {
246 acc266fe 2022-09-19 op if (tp_urlescape(clt->clt_tp,
247 acc266fe 2022-09-19 op clt->clt_script_name) == -1)
250 acc266fe 2022-09-19 op /* skip the first / */
254 acc266fe 2022-09-19 op if (tp_urlescape(clt->clt_tp, line) == -1 ||
255 b9de0a74 2022-09-14 op clt_puts(clt, "'>") == -1 ||
256 df2db214 2022-09-19 op tp_htmlescape(clt->clt_tp, label) == -1 ||
257 b9de0a74 2022-09-14 op clt_puts(clt, "</a></li>") == -1)
263 b9de0a74 2022-09-14 op if (clt->clt_translate & TR_NAV) {
264 b9de0a74 2022-09-14 op if (clt_puts(clt, "</ul></nav>") == -1)
266 b9de0a74 2022-09-14 op clt->clt_translate &= ~TR_NAV;
269 c9dc4bc6 2022-09-13 op /* pre opening */
270 c9dc4bc6 2022-09-13 op if (!strncmp(line, "```", 3)) {
272 ceb3f79c 2022-09-29 op line += strspn(line, " \t");
274 b9de0a74 2022-09-14 op clt->clt_translate |= TR_PRE;
275 ceb3f79c 2022-09-29 op return (tp_pre_open(clt->clt_tp, line));
278 c9dc4bc6 2022-09-13 op /* citation block */
279 c9dc4bc6 2022-09-13 op if (*line == '>') {
280 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<blockquote>") == -1 ||
281 df2db214 2022-09-19 op tp_htmlescape(clt->clt_tp, line + 1) == -1 ||
282 c9dc4bc6 2022-09-13 op clt_puts(clt, "</blockquote>") == -1)
287 c9dc4bc6 2022-09-13 op /* headings */
288 c9dc4bc6 2022-09-13 op if (!strncmp(line, "###", 3)) {
289 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<h3>") == -1 ||
290 df2db214 2022-09-19 op tp_htmlescape(clt->clt_tp, line + 3) == -1 ||
291 c9dc4bc6 2022-09-13 op clt_puts(clt, "</h3>") == -1)
295 c9dc4bc6 2022-09-13 op if (!strncmp(line, "##", 2)) {
296 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<h2>") == -1 ||
297 df2db214 2022-09-19 op tp_htmlescape(clt->clt_tp, line + 2) == -1 ||
298 c9dc4bc6 2022-09-13 op clt_puts(clt, "</h2>") == -1)
302 c9dc4bc6 2022-09-13 op if (!strncmp(line, "#", 1)) {
303 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<h1>") == -1 ||
304 df2db214 2022-09-19 op tp_htmlescape(clt->clt_tp, line + 1) == -1 ||
305 c9dc4bc6 2022-09-13 op clt_puts(clt, "</h1>") == -1)
310 df5279ca 2022-09-14 op /* Not following strictly the gemini specification... */
311 df5279ca 2022-09-14 op if (*line == '\0')
314 c9dc4bc6 2022-09-13 op /* paragraph */
315 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<p>") == -1 ||
316 df2db214 2022-09-19 op tp_htmlescape(clt->clt_tp, line) == -1 ||
317 c9dc4bc6 2022-09-13 op clt_puts(clt, "</p>") == -1)
324 c9dc4bc6 2022-09-13 op proxy_translate_gemtext(struct client *clt)
326 c9dc4bc6 2022-09-13 op struct bufferevent *bev = clt->clt_bev;
327 c9dc4bc6 2022-09-13 op struct evbuffer *src = EVBUFFER_INPUT(bev);
333 b9de0a74 2022-09-14 op line = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF);
334 c9dc4bc6 2022-09-13 op if (line == NULL)
337 c9dc4bc6 2022-09-13 op r = gemtext_translate_line(clt, line);
344 f774ad1e 2022-09-23 op struct proxy_config *
345 f774ad1e 2022-09-23 op proxy_match(struct galileo *env, const char *name)
347 afb86b2c 2022-09-23 op struct proxy *pr;
349 f774ad1e 2022-09-23 op if (name == NULL)
350 c9e6d547 2022-09-23 op return (NULL);
352 afb86b2c 2022-09-23 op TAILQ_FOREACH(pr, &env->sc_proxies, pr_entry) {
353 f774ad1e 2022-09-23 op if (!strcmp(name, pr->pr_conf.host))
354 c9e6d547 2022-09-23 op return (&pr->pr_conf);
357 c9e6d547 2022-09-23 op return (NULL);
361 b0a6bcf7 2022-09-13 op proxy_start_request(struct galileo *env, struct client *clt)
363 b0a6bcf7 2022-09-13 op struct addrinfo hints;
364 b0a6bcf7 2022-09-13 op struct asr_query *query;
368 f774ad1e 2022-09-23 op if ((clt->clt_pc = proxy_match(env, clt->clt_server_name)) == NULL) {
369 e3c1cbab 2022-09-20 op if (proxy_start_reply(clt, 501, "text/html") == -1)
371 abe17781 2022-09-20 op if (tp_error(clt->clt_tp, -1, "unknown server") == -1)
373 8857131d 2022-09-20 op return (fcgi_end_request(clt, 1));
376 8857131d 2022-09-20 op if (clt->clt_bodylen != 0 && clt->clt_body == NULL) {
377 8857131d 2022-09-20 op if (proxy_start_reply(clt, 400, "text/html") == -1)
379 8857131d 2022-09-20 op if (tp_error(clt->clt_tp, -1, "bad request") == -1)
381 8857131d 2022-09-20 op return (fcgi_end_request(clt, 1));
384 8857131d 2022-09-20 op if (clt->clt_body) {
385 8857131d 2022-09-20 op r = asprintf(&url, "%s%s?%s", clt->clt_script_name,
386 8857131d 2022-09-20 op clt->clt_path_info + 1, clt->clt_body);
388 8857131d 2022-09-20 op return (fcgi_end_request(clt, 1));
390 8857131d 2022-09-20 op if (proxy_start_reply(clt, 302, url) == -1 ||
391 8857131d 2022-09-20 op fcgi_end_request(clt, 1) == -1) {
399 b0a6bcf7 2022-09-13 op memset(&hints, 0, sizeof(hints));
400 b0a6bcf7 2022-09-13 op hints.ai_family = AF_UNSPEC;
401 b0a6bcf7 2022-09-13 op hints.ai_socktype = SOCK_STREAM;
403 26cd3e9d 2022-09-23 op query = getaddrinfo_async(clt->clt_pc->proxy_addr,
404 26cd3e9d 2022-09-23 op clt->clt_pc->proxy_port, &hints, NULL);
405 b0a6bcf7 2022-09-13 op if (query == NULL) {
406 b0a6bcf7 2022-09-13 op log_warn("getaddrinfo_async");
407 8857131d 2022-09-20 op return (fcgi_abort_request(clt));
410 b0a6bcf7 2022-09-13 op clt->clt_evasr = event_asr_run(query, proxy_resolved, clt);
411 b0a6bcf7 2022-09-13 op if (clt->clt_evasr == NULL) {
412 b0a6bcf7 2022-09-13 op log_warn("event_asr_run");
413 b0a6bcf7 2022-09-13 op asr_abort(query);
414 8857131d 2022-09-20 op return (fcgi_abort_request(clt));
421 b0a6bcf7 2022-09-13 op proxy_resolved(struct asr_result *res, void *d)
423 b0a6bcf7 2022-09-13 op struct client *clt = d;
424 b0a6bcf7 2022-09-13 op struct proxy_config *pc = clt->clt_pc;
426 b0a6bcf7 2022-09-13 op clt->clt_evasr = NULL;
428 b0a6bcf7 2022-09-13 op if (res->ar_gai_errno != 0) {
429 26cd3e9d 2022-09-23 op log_warnx("failed to resolve %s:%s: %s",
430 b0a6bcf7 2022-09-13 op pc->proxy_addr, pc->proxy_port,
431 b0a6bcf7 2022-09-13 op gai_strerror(res->ar_gai_errno));
432 e3c1cbab 2022-09-20 op if (proxy_start_reply(clt, 501, "text/html") == -1)
434 abe17781 2022-09-20 op if (tp_error(clt->clt_tp, -1, "Can't resolve host") == -1)
436 b0a6bcf7 2022-09-13 op fcgi_end_request(clt, 1);
440 b0a6bcf7 2022-09-13 op clt->clt_addrinfo = res->ar_addrinfo;
441 b0a6bcf7 2022-09-13 op clt->clt_p = clt->clt_addrinfo;
442 b0a6bcf7 2022-09-13 op proxy_connect(-1, 0, clt);
446 b0a6bcf7 2022-09-13 op proxy_connect(int fd, short ev, void *d)
448 b0a6bcf7 2022-09-13 op struct client *clt = d;
449 b0a6bcf7 2022-09-13 op struct evbuffer *out;
450 b0a6bcf7 2022-09-13 op struct addrinfo *p;
451 b0a6bcf7 2022-09-13 op struct tls_config *conf;
452 b0a6bcf7 2022-09-13 op struct timeval conntv = {5, 0};
454 b0a6bcf7 2022-09-13 op socklen_t len = sizeof(err);
457 b0a6bcf7 2022-09-13 op if (clt->clt_p == NULL)
460 b0a6bcf7 2022-09-13 op if (clt->clt_fd != -1) {
461 b0a6bcf7 2022-09-13 op if (getsockopt(clt->clt_fd, SOL_SOCKET, SO_ERROR, &err, &len)
464 b0a6bcf7 2022-09-13 op if (err != 0) {
471 b0a6bcf7 2022-09-13 op p = clt->clt_p;
472 b0a6bcf7 2022-09-13 op clt->clt_fd = socket(p->ai_family, p->ai_socktype | SOCK_NONBLOCK,
473 b0a6bcf7 2022-09-13 op p->ai_protocol);
474 b0a6bcf7 2022-09-13 op if (clt->clt_fd == -1) {
475 b0a6bcf7 2022-09-13 op clt->clt_p = clt->clt_p->ai_next;
479 b0a6bcf7 2022-09-13 op if (connect(clt->clt_fd, p->ai_addr, p->ai_addrlen) == 0)
482 b0a6bcf7 2022-09-13 op clt->clt_evconn_live = 1;
483 b0a6bcf7 2022-09-13 op event_set(&clt->clt_evconn, clt->clt_fd, EV_WRITE, proxy_connect, clt);
484 b0a6bcf7 2022-09-13 op event_add(&clt->clt_evconn, &conntv);
488 b0a6bcf7 2022-09-13 op clt->clt_evconn_live = 0;
489 b0a6bcf7 2022-09-13 op freeaddrinfo(clt->clt_addrinfo);
490 b0a6bcf7 2022-09-13 op clt->clt_addrinfo = clt->clt_p = NULL;
492 c743c9a1 2022-09-23 op clt->clt_bev = bufferevent_new(clt->clt_fd, proxy_read, proxy_write,
493 c743c9a1 2022-09-23 op proxy_error, clt);
494 c743c9a1 2022-09-23 op if (clt->clt_bev == NULL) {
495 c743c9a1 2022-09-23 op log_warn("bufferevent_new");
499 c743c9a1 2022-09-23 op if (!clt->clt_pc->no_tls) {
500 c743c9a1 2022-09-23 op /* initialize TLS for Gemini */
501 c743c9a1 2022-09-23 op if ((conf = tls_config_new()) == NULL) {
502 c743c9a1 2022-09-23 op log_warn("tls_config_new failed");
506 c743c9a1 2022-09-23 op tls_config_insecure_noverifycert(conf);
508 c743c9a1 2022-09-23 op if ((clt->clt_ctx = tls_client()) == NULL) {
509 c743c9a1 2022-09-23 op log_warnx("tls_client failed");
510 c743c9a1 2022-09-23 op tls_config_free(conf);
514 c743c9a1 2022-09-23 op if (tls_configure(clt->clt_ctx, conf) == -1) {
515 c743c9a1 2022-09-23 op log_warnx("tls_configure failed");
516 c743c9a1 2022-09-23 op tls_config_free(conf);
520 c743c9a1 2022-09-23 op tls_config_free(conf);
522 c743c9a1 2022-09-23 op if (tls_connect_socket(clt->clt_ctx, clt->clt_fd,
523 c743c9a1 2022-09-23 op clt->clt_pc->proxy_name) == -1) {
524 c743c9a1 2022-09-23 op log_warnx("tls_connect_socket failed");
528 c743c9a1 2022-09-23 op event_set(&clt->clt_bev->ev_read, clt->clt_fd, EV_READ,
529 c743c9a1 2022-09-23 op proxy_tls_readcb, clt->clt_bev);
530 c743c9a1 2022-09-23 op event_set(&clt->clt_bev->ev_write, clt->clt_fd, EV_WRITE,
531 c743c9a1 2022-09-23 op proxy_tls_writecb, clt->clt_bev);
533 83f0f95a 2022-09-29 op #if HAVE_LIBEVENT2
534 83f0f95a 2022-09-29 op evbuffer_unfreeze(clt->clt_bev->input, 0);
535 83f0f95a 2022-09-29 op evbuffer_unfreeze(clt->clt_bev->output, 1);
539 b0a6bcf7 2022-09-13 op /* bufferevent_settimeout(); */
540 b0a6bcf7 2022-09-13 op bufferevent_enable(clt->clt_bev, EV_READ|EV_WRITE);
542 b0a6bcf7 2022-09-13 op /* TODO: compute the URL */
543 c743c9a1 2022-09-23 op out = EVBUFFER_OUTPUT(clt->clt_bev);
544 28239bac 2022-09-20 op if (evbuffer_add_printf(out, "gemini://%s/%s",
545 ee80262d 2022-09-13 op clt->clt_pc->proxy_name, clt->clt_path_info) == -1) {
546 28239bac 2022-09-20 op log_warn("bufferevent_printf failed");
550 28239bac 2022-09-20 op if (clt->clt_query &&
551 28239bac 2022-09-20 op evbuffer_add_printf(out, "?%s", clt->clt_query) == -1) {
552 b0a6bcf7 2022-09-13 op log_warn("bufferevent_printf failed");
556 28239bac 2022-09-20 op if (evbuffer_add(out, "\r\n", 2) == -1) {
557 28239bac 2022-09-20 op log_warn("bufferevent_add failed");
564 26cd3e9d 2022-09-23 op log_warn("failed to connect to %s:%s",
565 b0a6bcf7 2022-09-13 op clt->clt_pc->proxy_addr, clt->clt_pc->proxy_port);
566 e3c1cbab 2022-09-20 op if (proxy_start_reply(clt, 501, "text/html") == -1)
568 abe17781 2022-09-20 op if (tp_error(clt->clt_tp, -1, "Can't connect") == -1)
570 b0a6bcf7 2022-09-13 op fcgi_end_request(clt, 1);
573 6edd9a00 2022-09-14 op static inline int
574 6edd9a00 2022-09-14 op parse_mime(struct client *clt, char *mime, char *lang, size_t len)
576 6edd9a00 2022-09-14 op char *t, *semi;
578 6edd9a00 2022-09-14 op if (strncmp(mime, "text/gemini", 11) != 0)
581 6edd9a00 2022-09-14 op clt->clt_translate = TR_ENABLED;
583 6edd9a00 2022-09-14 op if ((mime = strchr(mime, ';')) == NULL)
586 6edd9a00 2022-09-14 op *mime++ = '\0';
587 6edd9a00 2022-09-14 op while ((t = strsep(&mime, ";")) != NULL) {
588 6edd9a00 2022-09-14 op if (!strncmp(t, "charset=", 8)) {
590 6edd9a00 2022-09-14 op if (!strncasecmp(t, "utf8", 4) ||
591 8ab2d60e 2022-09-14 op !strncasecmp(t, "utf-8", 5) ||
592 6edd9a00 2022-09-14 op !strncasecmp(t, "ascii", 5)) {
593 6edd9a00 2022-09-14 op log_debug("unknown charset %s", t);
599 6edd9a00 2022-09-14 op if (!strncmp(t, "lang=", 5)) {
601 6edd9a00 2022-09-14 op if ((semi = strchr(t, ';')) != NULL)
602 6edd9a00 2022-09-14 op *semi = '\0';
604 6edd9a00 2022-09-14 op if (strlcpy(lang, t, len) >= len) {
605 6edd9a00 2022-09-14 op log_debug("lang too long: %s", t);
606 6edd9a00 2022-09-14 op *lang = '\0';
619 5163fbe9 2022-09-20 op proxy_start_reply(struct client *clt, int status, const char *ctype)
621 5163fbe9 2022-09-20 op const char *csp;
623 5163fbe9 2022-09-20 op csp = "Content-Security-Policy: default-src 'self'; "
624 5163fbe9 2022-09-20 op "script-src 'none'; object-src 'none';\r\n";
626 5163fbe9 2022-09-20 op if (status != 200 &&
627 2df73ca5 2022-09-20 op clt_printf(clt, "Status: %d\r\n", status) == -1)
630 2df73ca5 2022-09-20 op if (clt_puts(clt, csp) == -1)
633 8857131d 2022-09-20 op if (status == 302) {
634 8857131d 2022-09-20 op /* use "ctype" as redirect target */
635 8857131d 2022-09-20 op if (clt_printf(clt, "Location: %s\r\n", ctype) == -1)
637 8857131d 2022-09-20 op if (clt_puts(clt, "\r\n") == -1)
642 8857131d 2022-09-20 op if (ctype != NULL) {
643 8857131d 2022-09-20 op if (!strcmp(ctype, "text/html"))
644 8857131d 2022-09-20 op ctype = "text/html;charset=utf-8";
645 8857131d 2022-09-20 op if (clt_printf(clt, "Content-Type: %s\r\n", ctype)
650 5163fbe9 2022-09-20 op if (clt_puts(clt, "\r\n") == -1)
657 b0a6bcf7 2022-09-13 op proxy_read(struct bufferevent *bev, void *d)
659 b0a6bcf7 2022-09-13 op struct client *clt = d;
660 b0a6bcf7 2022-09-13 op struct evbuffer *src = EVBUFFER_INPUT(bev);
661 c9dc4bc6 2022-09-13 op const char *ctype;
662 6edd9a00 2022-09-14 op char lang[16];
663 6edd9a00 2022-09-14 op char *hdr, *mime;
667 b0a6bcf7 2022-09-13 op if (clt->clt_headersdone) {
668 c9dc4bc6 2022-09-13 op if (clt->clt_translate)
669 c9dc4bc6 2022-09-13 op proxy_translate_gemtext(clt);
671 c9dc4bc6 2022-09-13 op clt_write_bufferevent(clt, bev);
675 b0a6bcf7 2022-09-13 op hdr = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF_STRICT);
676 b0a6bcf7 2022-09-13 op if (hdr == NULL) {
677 b0a6bcf7 2022-09-13 op if (EVBUFFER_LENGTH(src) >= 1026)
678 b0a6bcf7 2022-09-13 op proxy_error(bev, EV_READ, clt);
682 b0a6bcf7 2022-09-13 op if (len < 4 ||
683 b0a6bcf7 2022-09-13 op !isdigit((unsigned char)hdr[0]) ||
684 b0a6bcf7 2022-09-13 op !isdigit((unsigned char)hdr[1]) ||
685 b0a6bcf7 2022-09-13 op hdr[2] != ' ') {
686 b0a6bcf7 2022-09-13 op log_warnx("invalid ");
687 b0a6bcf7 2022-09-13 op proxy_error(bev, EV_READ, clt);
691 abe17781 2022-09-20 op code = (hdr[0] - '0') * 10 + (hdr[1] - '0');
693 6e8f426e 2022-09-14 op switch (hdr[0]) {
695 8857131d 2022-09-20 op if (proxy_start_reply(clt, 200, "text/html") == -1)
697 8857131d 2022-09-20 op if (tp_inputpage(clt->clt_tp, &hdr[3]) == -1)
699 8857131d 2022-09-20 op fcgi_end_request(clt, 0);
702 6e8f426e 2022-09-14 op /* handled below */
705 b4f7fe4f 2022-09-21 op /* XXX: do proper parsing */
706 b4f7fe4f 2022-09-21 op if (hdr[3] == '/' || strstr(&hdr[3], "//") == NULL) {
709 b4f7fe4f 2022-09-21 op if (asprintf(&url, "%s%s", clt->clt_script_name,
710 b4f7fe4f 2022-09-21 op &hdr[3]) == -1)
713 b4f7fe4f 2022-09-21 op if (proxy_start_reply(clt, 302, url)) {
718 b4f7fe4f 2022-09-21 op fcgi_end_request(clt, 0);
721 02be3606 2022-09-29 op /* fallthrough */
723 e3c1cbab 2022-09-20 op if (proxy_start_reply(clt, 501, "text/html") == -1)
725 abe17781 2022-09-20 op if (tp_error(clt->clt_tp, code, &hdr[3]) == -1)
727 6e8f426e 2022-09-14 op fcgi_end_request(clt, 1);
731 6edd9a00 2022-09-14 op mime = hdr + 2 + strspn(hdr + 2, " \t");
732 6edd9a00 2022-09-14 op if (parse_mime(clt, mime, lang, sizeof(lang)) == -1) {
733 e3c1cbab 2022-09-20 op if (proxy_start_reply(clt, 501, "text/html") == -1)
735 abe17781 2022-09-20 op if (tp_error(clt->clt_tp, -1, "Bad response") == -1)
737 6edd9a00 2022-09-14 op fcgi_end_request(clt, 1);
741 232eee45 2022-09-20 op if (clt->clt_translate)
742 8ab2d60e 2022-09-14 op ctype = "text/html;charset=utf-8";
744 6edd9a00 2022-09-14 op ctype = mime;
746 6edd9a00 2022-09-14 op if (clt_printf(clt, "Content-Type: %s\r\n\r\n", ctype) == -1)
749 b0a6bcf7 2022-09-13 op clt->clt_headersdone = 1;
751 bff58270 2022-09-19 op if (clt->clt_translate &&
752 e3c1cbab 2022-09-20 op tp_head(clt->clt_tp, lang, NULL) == -1)
756 1337dc2b 2022-09-14 op * Trigger the read again so we proceed with the response
757 1337dc2b 2022-09-14 op * body, if any.
760 1337dc2b 2022-09-14 op proxy_read(bev, d);
768 b0a6bcf7 2022-09-13 op proxy_write(struct bufferevent *bev, void *d)
774 b0a6bcf7 2022-09-13 op proxy_error(struct bufferevent *bev, short err, void *d)
776 b0a6bcf7 2022-09-13 op struct client *clt = d;
777 b0a6bcf7 2022-09-13 op int status = !(err & EVBUFFER_EOF);
779 b0a6bcf7 2022-09-13 op log_debug("proxy error, shutting down the connection (err: %x)",
782 b0a6bcf7 2022-09-13 op if (!clt->clt_headersdone) {
783 e3c1cbab 2022-09-20 op if (proxy_start_reply(clt, 501, "text/html") == -1)
785 abe17781 2022-09-20 op if (tp_error(clt->clt_tp, -1, "Proxy error") == -1)
787 c9dc4bc6 2022-09-13 op } else if (status == 0) {
788 c42fce9b 2022-09-14 op if (clt->clt_translate & TR_PRE) {
789 ceb3f79c 2022-09-29 op if (tp_pre_close(clt->clt_tp))
791 c42fce9b 2022-09-14 op clt->clt_translate &= ~TR_PRE;
794 c42fce9b 2022-09-14 op if (clt->clt_translate & TR_LIST) {
795 c42fce9b 2022-09-14 op if (clt_puts(clt, "</ul>") == -1)
797 c42fce9b 2022-09-14 op clt->clt_translate &= ~TR_LIST;
800 c42fce9b 2022-09-14 op if (clt->clt_translate & TR_NAV) {
801 c42fce9b 2022-09-14 op if (clt_puts(clt, "</ul></nav>") == -1)
803 c42fce9b 2022-09-14 op clt->clt_translate &= ~TR_NAV;
806 54acddc9 2022-09-19 op if (clt->clt_translate &&
807 54acddc9 2022-09-19 op tp_foot(clt->clt_tp) == -1)
811 b0a6bcf7 2022-09-13 op fcgi_end_request(clt, status);
815 b0a6bcf7 2022-09-13 op proxy_tls_readcb(int fd, short event, void *arg)
817 b0a6bcf7 2022-09-13 op struct bufferevent *bufev = arg;
818 b0a6bcf7 2022-09-13 op struct client *clt = bufev->cbarg;
819 b0a6bcf7 2022-09-13 op char rbuf[IBUF_READ_SIZE];
820 b0a6bcf7 2022-09-13 op int what = EVBUFFER_READ;
821 b0a6bcf7 2022-09-13 op int howmuch = IBUF_READ_SIZE;
825 b0a6bcf7 2022-09-13 op if (event == EV_TIMEOUT) {
826 b0a6bcf7 2022-09-13 op what |= EVBUFFER_TIMEOUT;
830 b0a6bcf7 2022-09-13 op if (bufev->wm_read.high != 0)
831 b0a6bcf7 2022-09-13 op howmuch = MINIMUM(sizeof(rbuf), bufev->wm_read.high);
833 b0a6bcf7 2022-09-13 op ret = tls_read(clt->clt_ctx, rbuf, howmuch);
834 b0a6bcf7 2022-09-13 op if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) {
836 b0a6bcf7 2022-09-13 op } else if (ret == -1) {
837 b0a6bcf7 2022-09-13 op what |= EVBUFFER_ERROR;
842 b0a6bcf7 2022-09-13 op if (len == 0) {
843 b0a6bcf7 2022-09-13 op what |= EVBUFFER_EOF;
847 b0a6bcf7 2022-09-13 op if (evbuffer_add(bufev->input, rbuf, len) == -1) {
848 b0a6bcf7 2022-09-13 op what |= EVBUFFER_ERROR;
852 83f0f95a 2022-09-29 op proxy_bufferevent_add(&bufev->ev_read, G_TOUT(bufev->timeout_read));
854 b0a6bcf7 2022-09-13 op len = EVBUFFER_LENGTH(bufev->input);
855 b0a6bcf7 2022-09-13 op if (bufev->wm_read.low != 0 && len < bufev->wm_read.low)
857 b0a6bcf7 2022-09-13 op if (bufev->wm_read.high != 0 && len > bufev->wm_read.high) {
858 b0a6bcf7 2022-09-13 op struct evbuffer *buf = bufev->input;
859 b0a6bcf7 2022-09-13 op event_del(&bufev->ev_read);
860 b0a6bcf7 2022-09-13 op evbuffer_setcb(buf, bufferevent_read_pressure_cb, bufev);
864 b0a6bcf7 2022-09-13 op if (bufev->readcb != NULL)
865 b0a6bcf7 2022-09-13 op (*bufev->readcb)(bufev, bufev->cbarg);
869 83f0f95a 2022-09-29 op proxy_bufferevent_add(&bufev->ev_read, G_TOUT(bufev->timeout_read));
873 b0a6bcf7 2022-09-13 op (*bufev->errorcb)(bufev, what, bufev->cbarg);
877 b0a6bcf7 2022-09-13 op proxy_bufferevent_add(struct event *ev, int timeout)
879 b0a6bcf7 2022-09-13 op struct timeval tv, *ptv = NULL;
881 b0a6bcf7 2022-09-13 op if (timeout) {
882 b0a6bcf7 2022-09-13 op timerclear(&tv);
883 b0a6bcf7 2022-09-13 op tv.tv_sec = timeout;
887 b0a6bcf7 2022-09-13 op return (event_add(ev, ptv));
891 b0a6bcf7 2022-09-13 op proxy_tls_writecb(int fd, short event, void *arg)
893 b0a6bcf7 2022-09-13 op struct bufferevent *bufev = arg;
894 b0a6bcf7 2022-09-13 op struct client *clt = bufev->cbarg;
896 b0a6bcf7 2022-09-13 op short what = EVBUFFER_WRITE;
899 b0a6bcf7 2022-09-13 op if (event == EV_TIMEOUT) {
900 b0a6bcf7 2022-09-13 op what |= EVBUFFER_TIMEOUT;
904 b0a6bcf7 2022-09-13 op if (EVBUFFER_LENGTH(bufev->output)) {
905 b0a6bcf7 2022-09-13 op ret = tls_write(clt->clt_ctx,
906 b0a6bcf7 2022-09-13 op EVBUFFER_DATA(bufev->output),
907 b0a6bcf7 2022-09-13 op EVBUFFER_LENGTH(bufev->output));
908 b0a6bcf7 2022-09-13 op if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) {
910 b0a6bcf7 2022-09-13 op } else if (ret == -1) {
911 b0a6bcf7 2022-09-13 op what |= EVBUFFER_ERROR;
915 b0a6bcf7 2022-09-13 op evbuffer_drain(bufev->output, len);
918 b0a6bcf7 2022-09-13 op if (EVBUFFER_LENGTH(bufev->output) != 0)
919 83f0f95a 2022-09-29 op proxy_bufferevent_add(&bufev->ev_write,
920 83f0f95a 2022-09-29 op G_TOUT(bufev->timeout_write));
922 b0a6bcf7 2022-09-13 op if (bufev->writecb != NULL &&
923 b0a6bcf7 2022-09-13 op EVBUFFER_LENGTH(bufev->output) <= bufev->wm_write.low)
924 b0a6bcf7 2022-09-13 op (*bufev->writecb)(bufev, bufev->cbarg);
928 83f0f95a 2022-09-29 op proxy_bufferevent_add(&bufev->ev_write, G_TOUT(bufev->timeout_write));
932 b0a6bcf7 2022-09-13 op (*bufev->errorcb)(bufev, what, bufev->cbarg);
936 b0a6bcf7 2022-09-13 op proxy_client_free(struct client *clt)
938 b0a6bcf7 2022-09-13 op if (clt->clt_evasr)
939 b0a6bcf7 2022-09-13 op event_asr_abort(clt->clt_evasr);
941 b0a6bcf7 2022-09-13 op if (clt->clt_addrinfo)
942 b0a6bcf7 2022-09-13 op freeaddrinfo(clt->clt_addrinfo);
944 b0a6bcf7 2022-09-13 op if (clt->clt_evconn_live)
945 b0a6bcf7 2022-09-13 op event_del(&clt->clt_evconn);
947 b0a6bcf7 2022-09-13 op if (clt->clt_fd != -1)
948 b0a6bcf7 2022-09-13 op close(clt->clt_fd);
950 b0a6bcf7 2022-09-13 op if (clt->clt_ctx)
951 b0a6bcf7 2022-09-13 op tls_free(clt->clt_ctx);
953 b0a6bcf7 2022-09-13 op if (clt->clt_bev)
954 b0a6bcf7 2022-09-13 op bufferevent_free(clt->clt_bev);
956 a244322c 2022-09-29 op template_free(clt->clt_tp);
958 8857131d 2022-09-20 op free(clt->clt_body);
959 b0a6bcf7 2022-09-13 op free(clt->clt_server_name);
960 b0a6bcf7 2022-09-13 op free(clt->clt_script_name);
961 b0a6bcf7 2022-09-13 op free(clt->clt_path_info);
962 28239bac 2022-09-20 op free(clt->clt_query);