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 b0a6bcf7 2022-09-13 op proxy_purge(struct server *srv)
109 b0a6bcf7 2022-09-13 op proxy_inflight_dec(const char *why)
111 b0a6bcf7 2022-09-13 op proxy_inflight--;
112 b0a6bcf7 2022-09-13 op log_debug("%s: inflight decremented, now %d, %s",
113 b0a6bcf7 2022-09-13 op __func__, proxy_inflight, why);
117 b0a6bcf7 2022-09-13 op proxy_dispatch_parent(int fd, struct privsep_proc *p, struct imsg *imsg)
119 b0a6bcf7 2022-09-13 op struct privsep *ps = p->p_ps;
120 b0a6bcf7 2022-09-13 op struct galileo *env = ps->ps_env;
122 b0a6bcf7 2022-09-13 op switch (imsg->hdr.type) {
123 b0a6bcf7 2022-09-13 op case IMSG_CFG_SRV:
124 b0a6bcf7 2022-09-13 op if (config_getserver(env, imsg) == -1)
125 b0a6bcf7 2022-09-13 op fatal("config_getproxy");
127 b0a6bcf7 2022-09-13 op case IMSG_CFG_SOCK:
128 b0a6bcf7 2022-09-13 op /* XXX: improve */
130 b0a6bcf7 2022-09-13 op if (env->sc_sock_fd != -1) {
131 b0a6bcf7 2022-09-13 op event_del(&env->sc_evsock);
132 b0a6bcf7 2022-09-13 op close(env->sc_sock_fd);
135 b0a6bcf7 2022-09-13 op env->sc_sock_fd = config_getsock(env, imsg);
136 b0a6bcf7 2022-09-13 op if (env->sc_sock_fd == -1)
137 b0a6bcf7 2022-09-13 op fatal("config_getsock");
139 b0a6bcf7 2022-09-13 op event_set(&env->sc_evsock, env->sc_sock_fd,
140 ea8874f1 2022-09-13 op EV_READ | EV_PERSIST, fcgi_accept, env);
141 b0a6bcf7 2022-09-13 op event_add(&env->sc_evsock, NULL);
142 ea8874f1 2022-09-13 op evtimer_set(&env->sc_evpause, fcgi_accept, env);
144 b0a6bcf7 2022-09-13 op case IMSG_CFG_DONE:
145 b0a6bcf7 2022-09-13 op log_debug("config done!");
147 b0a6bcf7 2022-09-13 op case IMSG_CTL_START:
148 b0a6bcf7 2022-09-13 op proxy_launch(env);
151 b0a6bcf7 2022-09-13 op log_warnx("unknown message %d", imsg->hdr.type);
159 c9dc4bc6 2022-09-13 op gemtext_translate_line(struct client *clt, char *line)
161 c9dc4bc6 2022-09-13 op /* preformatted line / closing */
162 b9de0a74 2022-09-14 op if (clt->clt_translate & TR_PRE) {
163 c9dc4bc6 2022-09-13 op if (!strncmp(line, "```", 3)) {
164 b9de0a74 2022-09-14 op clt->clt_translate &= ~TR_PRE;
165 c9dc4bc6 2022-09-13 op return (clt_puts(clt, "</pre>"));
168 df2db214 2022-09-19 op if (tp_htmlescape(clt->clt_tp, line) == -1)
170 c9dc4bc6 2022-09-13 op return (clt_putc(clt, '\n'));
174 b9de0a74 2022-09-14 op if (!strncmp(line, "* ", 2)) {
175 b9de0a74 2022-09-14 op if (clt->clt_translate & TR_NAV) {
176 b9de0a74 2022-09-14 op if (clt_puts(clt, "</ul></nav>") == -1)
178 b9de0a74 2022-09-14 op clt->clt_translate &= ~TR_NAV;
181 b9de0a74 2022-09-14 op if (!(clt->clt_translate & TR_LIST)) {
182 b9de0a74 2022-09-14 op if (clt_puts(clt, "<ul>") == -1)
184 b9de0a74 2022-09-14 op clt->clt_translate |= TR_LIST;
187 b9de0a74 2022-09-14 op if (clt_puts(clt, "<li>") == -1 ||
188 df2db214 2022-09-19 op tp_htmlescape(clt->clt_tp, line + 2) == -1 ||
189 b9de0a74 2022-09-14 op clt_puts(clt, "</li>") == -1)
194 b9de0a74 2022-09-14 op if (clt->clt_translate & TR_LIST) {
195 b9de0a74 2022-09-14 op if (clt_puts(clt, "</ul>") == -1)
197 b9de0a74 2022-09-14 op clt->clt_translate &= ~TR_LIST;
200 b9de0a74 2022-09-14 op /* link -- TODO: relativify from SCRIPT_NAME */
201 b9de0a74 2022-09-14 op if (!strncmp(line, "=>", 2)) {
205 b9de0a74 2022-09-14 op line += strspn(line, " \t");
207 b9de0a74 2022-09-14 op label = line + strcspn(line, " \t");
208 b9de0a74 2022-09-14 op if (*label == '\0')
209 b9de0a74 2022-09-14 op label = line;
211 b9de0a74 2022-09-14 op *label++ = '\0';
213 33f4bf26 2022-09-14 op if (fnmatch("*.jpg", line, 0) == 0 ||
214 33f4bf26 2022-09-14 op fnmatch("*.jpeg", line, 0) == 0 ||
215 33f4bf26 2022-09-14 op fnmatch("*.gif", line, 0) == 0 ||
216 33f4bf26 2022-09-14 op fnmatch("*.png", line, 0) == 0 ||
217 33f4bf26 2022-09-14 op fnmatch("*.svg", line, 0) == 0 ||
218 33f4bf26 2022-09-14 op fnmatch("*.webp", line, 0) == 0) {
219 33f4bf26 2022-09-14 op if (clt->clt_translate & TR_NAV) {
220 33f4bf26 2022-09-14 op if (clt_puts(clt, "</ul></nav>") == -1)
222 33f4bf26 2022-09-14 op clt->clt_translate &= ~TR_NAV;
225 bff58270 2022-09-19 op if (tp_figure(clt->clt_tp, line, label) == -1)
231 33f4bf26 2022-09-14 op if (!(clt->clt_translate & TR_NAV)) {
232 33f4bf26 2022-09-14 op if (clt_puts(clt, "<nav><ul>") == -1)
234 33f4bf26 2022-09-14 op clt->clt_translate |= TR_NAV;
237 acc266fe 2022-09-19 op if (clt_puts(clt, "<li><a href='") == -1)
240 acc266fe 2022-09-19 op /* XXX: do proper parsing */
241 acc266fe 2022-09-19 op if (*line == '/' || strstr(line, "//") == NULL) {
242 acc266fe 2022-09-19 op if (tp_urlescape(clt->clt_tp,
243 acc266fe 2022-09-19 op clt->clt_script_name) == -1)
246 acc266fe 2022-09-19 op /* skip the first / */
250 acc266fe 2022-09-19 op if (tp_urlescape(clt->clt_tp, line) == -1 ||
251 b9de0a74 2022-09-14 op clt_puts(clt, "'>") == -1 ||
252 df2db214 2022-09-19 op tp_htmlescape(clt->clt_tp, label) == -1 ||
253 b9de0a74 2022-09-14 op clt_puts(clt, "</a></li>") == -1)
259 b9de0a74 2022-09-14 op if (clt->clt_translate & TR_NAV) {
260 b9de0a74 2022-09-14 op if (clt_puts(clt, "</ul></nav>") == -1)
262 b9de0a74 2022-09-14 op clt->clt_translate &= ~TR_NAV;
265 c9dc4bc6 2022-09-13 op /* pre opening */
266 c9dc4bc6 2022-09-13 op if (!strncmp(line, "```", 3)) {
267 b9de0a74 2022-09-14 op clt->clt_translate |= TR_PRE;
268 c9dc4bc6 2022-09-13 op return (clt_puts(clt, "<pre>"));
271 c9dc4bc6 2022-09-13 op /* citation block */
272 c9dc4bc6 2022-09-13 op if (*line == '>') {
273 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<blockquote>") == -1 ||
274 df2db214 2022-09-19 op tp_htmlescape(clt->clt_tp, line + 1) == -1 ||
275 c9dc4bc6 2022-09-13 op clt_puts(clt, "</blockquote>") == -1)
280 c9dc4bc6 2022-09-13 op /* headings */
281 c9dc4bc6 2022-09-13 op if (!strncmp(line, "###", 3)) {
282 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<h3>") == -1 ||
283 df2db214 2022-09-19 op tp_htmlescape(clt->clt_tp, line + 3) == -1 ||
284 c9dc4bc6 2022-09-13 op clt_puts(clt, "</h3>") == -1)
288 c9dc4bc6 2022-09-13 op if (!strncmp(line, "##", 2)) {
289 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<h2>") == -1 ||
290 df2db214 2022-09-19 op tp_htmlescape(clt->clt_tp, line + 2) == -1 ||
291 c9dc4bc6 2022-09-13 op clt_puts(clt, "</h2>") == -1)
295 c9dc4bc6 2022-09-13 op if (!strncmp(line, "#", 1)) {
296 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<h1>") == -1 ||
297 df2db214 2022-09-19 op tp_htmlescape(clt->clt_tp, line + 1) == -1 ||
298 c9dc4bc6 2022-09-13 op clt_puts(clt, "</h1>") == -1)
303 df5279ca 2022-09-14 op /* Not following strictly the gemini specification... */
304 df5279ca 2022-09-14 op if (*line == '\0')
307 c9dc4bc6 2022-09-13 op /* paragraph */
308 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<p>") == -1 ||
309 df2db214 2022-09-19 op tp_htmlescape(clt->clt_tp, line) == -1 ||
310 c9dc4bc6 2022-09-13 op clt_puts(clt, "</p>") == -1)
317 c9dc4bc6 2022-09-13 op proxy_translate_gemtext(struct client *clt)
319 c9dc4bc6 2022-09-13 op struct bufferevent *bev = clt->clt_bev;
320 c9dc4bc6 2022-09-13 op struct evbuffer *src = EVBUFFER_INPUT(bev);
326 b9de0a74 2022-09-14 op line = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF);
327 c9dc4bc6 2022-09-13 op if (line == NULL)
330 c9dc4bc6 2022-09-13 op r = gemtext_translate_line(clt, line);
337 b0a6bcf7 2022-09-13 op static struct proxy_config *
338 b0a6bcf7 2022-09-13 op proxy_server_match(struct galileo *env, struct client *clt)
340 b0a6bcf7 2022-09-13 op struct server *srv;
342 b0a6bcf7 2022-09-13 op if (clt->clt_server_name == NULL)
345 b0a6bcf7 2022-09-13 op TAILQ_FOREACH(srv, &env->sc_servers, srv_entry) {
346 b0a6bcf7 2022-09-13 op if (!strcmp(clt->clt_server_name, srv->srv_conf.host))
347 b0a6bcf7 2022-09-13 op return &srv->srv_conf;
354 b0a6bcf7 2022-09-13 op proxy_start_request(struct galileo *env, struct client *clt)
356 b0a6bcf7 2022-09-13 op struct addrinfo hints;
357 b0a6bcf7 2022-09-13 op struct asr_query *query;
358 b0a6bcf7 2022-09-13 op char port[32];
360 b0a6bcf7 2022-09-13 op if ((clt->clt_pc = proxy_server_match(env, clt)) == NULL) {
361 e3c1cbab 2022-09-20 op if (proxy_start_reply(clt, 501, "text/html") == -1)
363 e3c1cbab 2022-09-20 op if (tp_error(clt->clt_tp, "unknown server") == -1)
365 b0a6bcf7 2022-09-13 op fcgi_end_request(clt, 1);
369 b0a6bcf7 2022-09-13 op (void)snprintf(port, sizeof(port), "%d", clt->clt_pc->proxy_port);
371 b0a6bcf7 2022-09-13 op memset(&hints, 0, sizeof(hints));
372 b0a6bcf7 2022-09-13 op hints.ai_family = AF_UNSPEC;
373 b0a6bcf7 2022-09-13 op hints.ai_socktype = SOCK_STREAM;
375 b0a6bcf7 2022-09-13 op query = getaddrinfo_async(clt->clt_pc->proxy_addr, port, &hints, NULL);
376 b0a6bcf7 2022-09-13 op if (query == NULL) {
377 b0a6bcf7 2022-09-13 op log_warn("getaddrinfo_async");
378 b0a6bcf7 2022-09-13 op fcgi_abort_request(clt);
382 b0a6bcf7 2022-09-13 op clt->clt_evasr = event_asr_run(query, proxy_resolved, clt);
383 b0a6bcf7 2022-09-13 op if (clt->clt_evasr == NULL) {
384 b0a6bcf7 2022-09-13 op log_warn("event_asr_run");
385 b0a6bcf7 2022-09-13 op asr_abort(query);
386 b0a6bcf7 2022-09-13 op fcgi_abort_request(clt);
392 b0a6bcf7 2022-09-13 op proxy_resolved(struct asr_result *res, void *d)
394 b0a6bcf7 2022-09-13 op struct client *clt = d;
395 b0a6bcf7 2022-09-13 op struct proxy_config *pc = clt->clt_pc;
397 b0a6bcf7 2022-09-13 op clt->clt_evasr = NULL;
399 b0a6bcf7 2022-09-13 op if (res->ar_gai_errno != 0) {
400 b0a6bcf7 2022-09-13 op log_warnx("failed to resolve %s:%d: %s",
401 b0a6bcf7 2022-09-13 op pc->proxy_addr, pc->proxy_port,
402 b0a6bcf7 2022-09-13 op gai_strerror(res->ar_gai_errno));
403 e3c1cbab 2022-09-20 op if (proxy_start_reply(clt, 501, "text/html") == -1)
405 e3c1cbab 2022-09-20 op if (tp_error(clt->clt_tp, "Can't resolve host") == -1)
407 b0a6bcf7 2022-09-13 op fcgi_end_request(clt, 1);
411 b0a6bcf7 2022-09-13 op clt->clt_addrinfo = res->ar_addrinfo;
412 b0a6bcf7 2022-09-13 op clt->clt_p = clt->clt_addrinfo;
413 b0a6bcf7 2022-09-13 op proxy_connect(-1, 0, clt);
417 b0a6bcf7 2022-09-13 op proxy_connect(int fd, short ev, void *d)
419 b0a6bcf7 2022-09-13 op struct client *clt = d;
420 b0a6bcf7 2022-09-13 op struct evbuffer *out;
421 b0a6bcf7 2022-09-13 op struct addrinfo *p;
422 b0a6bcf7 2022-09-13 op struct tls_config *conf;
423 b0a6bcf7 2022-09-13 op struct timeval conntv = {5, 0};
425 b0a6bcf7 2022-09-13 op socklen_t len = sizeof(err);
428 b0a6bcf7 2022-09-13 op if (clt->clt_p == NULL)
431 b0a6bcf7 2022-09-13 op if (clt->clt_fd != -1) {
432 b0a6bcf7 2022-09-13 op if (getsockopt(clt->clt_fd, SOL_SOCKET, SO_ERROR, &err, &len)
435 b0a6bcf7 2022-09-13 op if (err != 0) {
442 b0a6bcf7 2022-09-13 op p = clt->clt_p;
443 b0a6bcf7 2022-09-13 op clt->clt_fd = socket(p->ai_family, p->ai_socktype | SOCK_NONBLOCK,
444 b0a6bcf7 2022-09-13 op p->ai_protocol);
445 b0a6bcf7 2022-09-13 op if (clt->clt_fd == -1) {
446 b0a6bcf7 2022-09-13 op clt->clt_p = clt->clt_p->ai_next;
450 b0a6bcf7 2022-09-13 op if (connect(clt->clt_fd, p->ai_addr, p->ai_addrlen) == 0)
453 b0a6bcf7 2022-09-13 op clt->clt_evconn_live = 1;
454 b0a6bcf7 2022-09-13 op event_set(&clt->clt_evconn, clt->clt_fd, EV_WRITE, proxy_connect, clt);
455 b0a6bcf7 2022-09-13 op event_add(&clt->clt_evconn, &conntv);
459 b0a6bcf7 2022-09-13 op clt->clt_evconn_live = 0;
460 b0a6bcf7 2022-09-13 op freeaddrinfo(clt->clt_addrinfo);
461 b0a6bcf7 2022-09-13 op clt->clt_addrinfo = clt->clt_p = NULL;
463 b0a6bcf7 2022-09-13 op /* initialize TLS for Gemini */
464 b0a6bcf7 2022-09-13 op if ((conf = tls_config_new()) == NULL) {
465 b0a6bcf7 2022-09-13 op log_warn("tls_config_new failed");
469 b0a6bcf7 2022-09-13 op tls_config_insecure_noverifycert(conf);
471 b0a6bcf7 2022-09-13 op if ((clt->clt_ctx = tls_client()) == NULL) {
472 b0a6bcf7 2022-09-13 op log_warnx("tls_client failed");
473 b0a6bcf7 2022-09-13 op tls_config_free(conf);
477 b0a6bcf7 2022-09-13 op if (tls_configure(clt->clt_ctx, conf) == -1) {
478 b0a6bcf7 2022-09-13 op log_warnx("tls_configure failed");
479 b0a6bcf7 2022-09-13 op tls_config_free(conf);
483 b0a6bcf7 2022-09-13 op tls_config_free(conf);
485 b0a6bcf7 2022-09-13 op if (tls_connect_socket(clt->clt_ctx, clt->clt_fd,
486 b0a6bcf7 2022-09-13 op clt->clt_pc->proxy_name) == -1) {
487 b0a6bcf7 2022-09-13 op log_warnx("tls_connect_socket failed");
491 b0a6bcf7 2022-09-13 op clt->clt_bev = bufferevent_new(clt->clt_fd, proxy_read, proxy_write,
492 b0a6bcf7 2022-09-13 op proxy_error, clt);
493 b0a6bcf7 2022-09-13 op if (clt->clt_bev == NULL) {
494 b0a6bcf7 2022-09-13 op log_warn("bufferevent_new");
497 b0a6bcf7 2022-09-13 op out = EVBUFFER_OUTPUT(clt->clt_bev);
499 b0a6bcf7 2022-09-13 op event_set(&clt->clt_bev->ev_read, clt->clt_fd, EV_READ,
500 b0a6bcf7 2022-09-13 op proxy_tls_readcb, clt->clt_bev);
501 b0a6bcf7 2022-09-13 op event_set(&clt->clt_bev->ev_write, clt->clt_fd, EV_WRITE,
502 b0a6bcf7 2022-09-13 op proxy_tls_writecb, clt->clt_bev);
504 b0a6bcf7 2022-09-13 op /* bufferevent_settimeout(); */
505 b0a6bcf7 2022-09-13 op bufferevent_enable(clt->clt_bev, EV_READ|EV_WRITE);
507 b0a6bcf7 2022-09-13 op /* TODO: compute the URL */
508 ee80262d 2022-09-13 op if (evbuffer_add_printf(out, "gemini://%s/%s\r\n",
509 ee80262d 2022-09-13 op clt->clt_pc->proxy_name, clt->clt_path_info) == -1) {
510 b0a6bcf7 2022-09-13 op log_warn("bufferevent_printf failed");
517 b0a6bcf7 2022-09-13 op log_warn("failed to connect to %s:%d",
518 b0a6bcf7 2022-09-13 op clt->clt_pc->proxy_addr, clt->clt_pc->proxy_port);
519 e3c1cbab 2022-09-20 op if (proxy_start_reply(clt, 501, "text/html") == -1)
521 e3c1cbab 2022-09-20 op if (tp_error(clt->clt_tp, "Can't connect") == -1)
523 b0a6bcf7 2022-09-13 op fcgi_end_request(clt, 1);
526 6edd9a00 2022-09-14 op static inline int
527 6edd9a00 2022-09-14 op parse_mime(struct client *clt, char *mime, char *lang, size_t len)
529 6edd9a00 2022-09-14 op char *t, *semi;
531 6edd9a00 2022-09-14 op if (strncmp(mime, "text/gemini", 11) != 0)
534 6edd9a00 2022-09-14 op clt->clt_translate = TR_ENABLED;
536 6edd9a00 2022-09-14 op if ((mime = strchr(mime, ';')) == NULL)
539 6edd9a00 2022-09-14 op *mime++ = '\0';
540 6edd9a00 2022-09-14 op while ((t = strsep(&mime, ";")) != NULL) {
541 6edd9a00 2022-09-14 op if (!strncmp(t, "charset=", 8)) {
543 6edd9a00 2022-09-14 op if (!strncasecmp(t, "utf8", 4) ||
544 8ab2d60e 2022-09-14 op !strncasecmp(t, "utf-8", 5) ||
545 6edd9a00 2022-09-14 op !strncasecmp(t, "ascii", 5)) {
546 6edd9a00 2022-09-14 op log_debug("unknown charset %s", t);
552 6edd9a00 2022-09-14 op if (!strncmp(t, "lang=", 5)) {
554 6edd9a00 2022-09-14 op if ((semi = strchr(t, ';')) != NULL)
555 6edd9a00 2022-09-14 op *semi = '\0';
557 6edd9a00 2022-09-14 op if (strlcpy(lang, t, len) >= len) {
558 6edd9a00 2022-09-14 op log_debug("lang too long: %s", t);
559 6edd9a00 2022-09-14 op *lang = '\0';
572 5163fbe9 2022-09-20 op proxy_start_reply(struct client *clt, int status, const char *ctype)
574 5163fbe9 2022-09-20 op const char *csp;
576 5163fbe9 2022-09-20 op csp = "Content-Security-Policy: default-src 'self'; "
577 5163fbe9 2022-09-20 op "script-src 'none'; object-src 'none';\r\n";
579 5163fbe9 2022-09-20 op if (ctype != NULL && !strcmp(ctype, "text/html"))
580 5163fbe9 2022-09-20 op ctype = "text/html;charset=utf-8";
582 5163fbe9 2022-09-20 op if (status != 200 &&
583 2df73ca5 2022-09-20 op clt_printf(clt, "Status: %d\r\n", status) == -1)
586 5163fbe9 2022-09-20 op if (ctype != NULL &&
587 5163fbe9 2022-09-20 op clt_printf(clt, "Content-Type: %s\r\n", ctype) == -1)
590 2df73ca5 2022-09-20 op if (clt_puts(clt, csp) == -1)
593 5163fbe9 2022-09-20 op if (clt_puts(clt, "\r\n") == -1)
600 b0a6bcf7 2022-09-13 op proxy_read(struct bufferevent *bev, void *d)
602 b0a6bcf7 2022-09-13 op struct client *clt = d;
603 b0a6bcf7 2022-09-13 op struct evbuffer *src = EVBUFFER_INPUT(bev);
604 c9dc4bc6 2022-09-13 op const char *ctype;
605 6edd9a00 2022-09-14 op char lang[16];
606 6edd9a00 2022-09-14 op char *hdr, *mime;
609 b0a6bcf7 2022-09-13 op if (clt->clt_headersdone) {
610 c9dc4bc6 2022-09-13 op if (clt->clt_translate)
611 c9dc4bc6 2022-09-13 op proxy_translate_gemtext(clt);
613 c9dc4bc6 2022-09-13 op clt_write_bufferevent(clt, bev);
617 b0a6bcf7 2022-09-13 op hdr = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF_STRICT);
618 b0a6bcf7 2022-09-13 op if (hdr == NULL) {
619 b0a6bcf7 2022-09-13 op if (EVBUFFER_LENGTH(src) >= 1026)
620 b0a6bcf7 2022-09-13 op proxy_error(bev, EV_READ, clt);
624 b0a6bcf7 2022-09-13 op if (len < 4 ||
625 b0a6bcf7 2022-09-13 op !isdigit((unsigned char)hdr[0]) ||
626 b0a6bcf7 2022-09-13 op !isdigit((unsigned char)hdr[1]) ||
627 b0a6bcf7 2022-09-13 op hdr[2] != ' ') {
628 b0a6bcf7 2022-09-13 op log_warnx("invalid ");
629 b0a6bcf7 2022-09-13 op proxy_error(bev, EV_READ, clt);
633 6e8f426e 2022-09-14 op switch (hdr[0]) {
635 6e8f426e 2022-09-14 op /* handled below */
638 e3c1cbab 2022-09-20 op if (proxy_start_reply(clt, 501, "text/html") == -1)
640 e3c1cbab 2022-09-20 op if (tp_error(clt->clt_tp, &hdr[3]) == -1)
642 6e8f426e 2022-09-14 op fcgi_end_request(clt, 1);
646 6edd9a00 2022-09-14 op mime = hdr + 2 + strspn(hdr + 2, " \t");
647 6edd9a00 2022-09-14 op if (parse_mime(clt, mime, lang, sizeof(lang)) == -1) {
648 e3c1cbab 2022-09-20 op if (proxy_start_reply(clt, 501, "text/html") == -1)
650 e3c1cbab 2022-09-20 op if (tp_error(clt->clt_tp, "Bad response") == -1)
652 6edd9a00 2022-09-14 op fcgi_end_request(clt, 1);
656 232eee45 2022-09-20 op if (clt->clt_translate)
657 8ab2d60e 2022-09-14 op ctype = "text/html;charset=utf-8";
659 6edd9a00 2022-09-14 op ctype = mime;
661 6edd9a00 2022-09-14 op if (clt_printf(clt, "Content-Type: %s\r\n\r\n", ctype) == -1)
664 b0a6bcf7 2022-09-13 op clt->clt_headersdone = 1;
666 bff58270 2022-09-19 op if (clt->clt_translate &&
667 e3c1cbab 2022-09-20 op tp_head(clt->clt_tp, lang, NULL) == -1)
671 1337dc2b 2022-09-14 op * Trigger the read again so we proceed with the response
672 1337dc2b 2022-09-14 op * body, if any.
675 1337dc2b 2022-09-14 op proxy_read(bev, d);
683 b0a6bcf7 2022-09-13 op proxy_write(struct bufferevent *bev, void *d)
689 b0a6bcf7 2022-09-13 op proxy_error(struct bufferevent *bev, short err, void *d)
691 b0a6bcf7 2022-09-13 op struct client *clt = d;
692 b0a6bcf7 2022-09-13 op int status = !(err & EVBUFFER_EOF);
694 b0a6bcf7 2022-09-13 op log_debug("proxy error, shutting down the connection (err: %x)",
697 b0a6bcf7 2022-09-13 op if (!clt->clt_headersdone) {
698 e3c1cbab 2022-09-20 op if (proxy_start_reply(clt, 501, "text/html") == -1)
700 e3c1cbab 2022-09-20 op if (tp_error(clt->clt_tp, "Proxy error") == -1)
702 c9dc4bc6 2022-09-13 op } else if (status == 0) {
703 c42fce9b 2022-09-14 op if (clt->clt_translate & TR_PRE) {
704 c42fce9b 2022-09-14 op if (clt_puts(clt, "</pre>"))
706 c42fce9b 2022-09-14 op clt->clt_translate &= ~TR_PRE;
709 c42fce9b 2022-09-14 op if (clt->clt_translate & TR_LIST) {
710 c42fce9b 2022-09-14 op if (clt_puts(clt, "</ul>") == -1)
712 c42fce9b 2022-09-14 op clt->clt_translate &= ~TR_LIST;
715 c42fce9b 2022-09-14 op if (clt->clt_translate & TR_NAV) {
716 c42fce9b 2022-09-14 op if (clt_puts(clt, "</ul></nav>") == -1)
718 c42fce9b 2022-09-14 op clt->clt_translate &= ~TR_NAV;
721 54acddc9 2022-09-19 op if (clt->clt_translate &&
722 54acddc9 2022-09-19 op tp_foot(clt->clt_tp) == -1)
726 b0a6bcf7 2022-09-13 op fcgi_end_request(clt, status);
730 b0a6bcf7 2022-09-13 op proxy_tls_readcb(int fd, short event, void *arg)
732 b0a6bcf7 2022-09-13 op struct bufferevent *bufev = arg;
733 b0a6bcf7 2022-09-13 op struct client *clt = bufev->cbarg;
734 b0a6bcf7 2022-09-13 op char rbuf[IBUF_READ_SIZE];
735 b0a6bcf7 2022-09-13 op int what = EVBUFFER_READ;
736 b0a6bcf7 2022-09-13 op int howmuch = IBUF_READ_SIZE;
740 b0a6bcf7 2022-09-13 op if (event == EV_TIMEOUT) {
741 b0a6bcf7 2022-09-13 op what |= EVBUFFER_TIMEOUT;
745 b0a6bcf7 2022-09-13 op if (bufev->wm_read.high != 0)
746 b0a6bcf7 2022-09-13 op howmuch = MINIMUM(sizeof(rbuf), bufev->wm_read.high);
748 b0a6bcf7 2022-09-13 op ret = tls_read(clt->clt_ctx, rbuf, howmuch);
749 b0a6bcf7 2022-09-13 op if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) {
751 b0a6bcf7 2022-09-13 op } else if (ret == -1) {
752 b0a6bcf7 2022-09-13 op what |= EVBUFFER_ERROR;
757 b0a6bcf7 2022-09-13 op if (len == 0) {
758 b0a6bcf7 2022-09-13 op what |= EVBUFFER_EOF;
762 b0a6bcf7 2022-09-13 op if (evbuffer_add(bufev->input, rbuf, len) == -1) {
763 b0a6bcf7 2022-09-13 op what |= EVBUFFER_ERROR;
767 b0a6bcf7 2022-09-13 op proxy_bufferevent_add(&bufev->ev_read, bufev->timeout_read);
769 b0a6bcf7 2022-09-13 op len = EVBUFFER_LENGTH(bufev->input);
770 b0a6bcf7 2022-09-13 op if (bufev->wm_read.low != 0 && len < bufev->wm_read.low)
772 b0a6bcf7 2022-09-13 op if (bufev->wm_read.high != 0 && len > bufev->wm_read.high) {
773 b0a6bcf7 2022-09-13 op struct evbuffer *buf = bufev->input;
774 b0a6bcf7 2022-09-13 op event_del(&bufev->ev_read);
775 b0a6bcf7 2022-09-13 op evbuffer_setcb(buf, bufferevent_read_pressure_cb, bufev);
779 b0a6bcf7 2022-09-13 op if (bufev->readcb != NULL)
780 b0a6bcf7 2022-09-13 op (*bufev->readcb)(bufev, bufev->cbarg);
784 b0a6bcf7 2022-09-13 op proxy_bufferevent_add(&bufev->ev_read, bufev->timeout_read);
788 b0a6bcf7 2022-09-13 op (*bufev->errorcb)(bufev, what, bufev->cbarg);
792 b0a6bcf7 2022-09-13 op proxy_bufferevent_add(struct event *ev, int timeout)
794 b0a6bcf7 2022-09-13 op struct timeval tv, *ptv = NULL;
796 b0a6bcf7 2022-09-13 op if (timeout) {
797 b0a6bcf7 2022-09-13 op timerclear(&tv);
798 b0a6bcf7 2022-09-13 op tv.tv_sec = timeout;
802 b0a6bcf7 2022-09-13 op return (event_add(ev, ptv));
806 b0a6bcf7 2022-09-13 op proxy_tls_writecb(int fd, short event, void *arg)
808 b0a6bcf7 2022-09-13 op struct bufferevent *bufev = arg;
809 b0a6bcf7 2022-09-13 op struct client *clt = bufev->cbarg;
811 b0a6bcf7 2022-09-13 op short what = EVBUFFER_WRITE;
814 b0a6bcf7 2022-09-13 op if (event == EV_TIMEOUT) {
815 b0a6bcf7 2022-09-13 op what |= EVBUFFER_TIMEOUT;
819 b0a6bcf7 2022-09-13 op if (EVBUFFER_LENGTH(bufev->output)) {
820 b0a6bcf7 2022-09-13 op ret = tls_write(clt->clt_ctx,
821 b0a6bcf7 2022-09-13 op EVBUFFER_DATA(bufev->output),
822 b0a6bcf7 2022-09-13 op EVBUFFER_LENGTH(bufev->output));
823 b0a6bcf7 2022-09-13 op if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) {
825 b0a6bcf7 2022-09-13 op } else if (ret == -1) {
826 b0a6bcf7 2022-09-13 op what |= EVBUFFER_ERROR;
830 b0a6bcf7 2022-09-13 op evbuffer_drain(bufev->output, len);
833 b0a6bcf7 2022-09-13 op if (EVBUFFER_LENGTH(bufev->output) != 0)
834 b0a6bcf7 2022-09-13 op proxy_bufferevent_add(&bufev->ev_write, bufev->timeout_write);
836 b0a6bcf7 2022-09-13 op if (bufev->writecb != NULL &&
837 b0a6bcf7 2022-09-13 op EVBUFFER_LENGTH(bufev->output) <= bufev->wm_write.low)
838 b0a6bcf7 2022-09-13 op (*bufev->writecb)(bufev, bufev->cbarg);
842 b0a6bcf7 2022-09-13 op proxy_bufferevent_add(&bufev->ev_write, bufev->timeout_write);
846 b0a6bcf7 2022-09-13 op (*bufev->errorcb)(bufev, what, bufev->cbarg);
850 b0a6bcf7 2022-09-13 op proxy_client_free(struct client *clt)
852 b0a6bcf7 2022-09-13 op if (clt->clt_evasr)
853 b0a6bcf7 2022-09-13 op event_asr_abort(clt->clt_evasr);
855 b0a6bcf7 2022-09-13 op if (clt->clt_addrinfo)
856 b0a6bcf7 2022-09-13 op freeaddrinfo(clt->clt_addrinfo);
858 b0a6bcf7 2022-09-13 op if (clt->clt_evconn_live)
859 b0a6bcf7 2022-09-13 op event_del(&clt->clt_evconn);
861 b0a6bcf7 2022-09-13 op if (clt->clt_fd != -1)
862 b0a6bcf7 2022-09-13 op close(clt->clt_fd);
864 b0a6bcf7 2022-09-13 op if (clt->clt_ctx)
865 b0a6bcf7 2022-09-13 op tls_free(clt->clt_ctx);
867 b0a6bcf7 2022-09-13 op if (clt->clt_bev)
868 b0a6bcf7 2022-09-13 op bufferevent_free(clt->clt_bev);
870 bff58270 2022-09-19 op free(clt->clt_tp);
871 b0a6bcf7 2022-09-13 op free(clt->clt_server_name);
872 b0a6bcf7 2022-09-13 op free(clt->clt_script_name);
873 b0a6bcf7 2022-09-13 op free(clt->clt_path_info);