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 b0a6bcf7 2022-09-13 op #include <limits.h>
33 b0a6bcf7 2022-09-13 op #include <stdlib.h>
34 b0a6bcf7 2022-09-13 op #include <stdint.h>
35 b0a6bcf7 2022-09-13 op #include <stdio.h>
36 b0a6bcf7 2022-09-13 op #include <string.h>
37 b0a6bcf7 2022-09-13 op #include <imsg.h>
38 b0a6bcf7 2022-09-13 op #include <tls.h>
39 b0a6bcf7 2022-09-13 op #include <unistd.h>
41 b0a6bcf7 2022-09-13 op #include "log.h"
42 b0a6bcf7 2022-09-13 op #include "proc.h"
44 b0a6bcf7 2022-09-13 op #include "galileo.h"
46 b0a6bcf7 2022-09-13 op #define MINIMUM(a, b) ((a) < (b) ? (a) : (b))
48 b0a6bcf7 2022-09-13 op /* provided by OpenBSD' base libevent but not in any header? */
49 b0a6bcf7 2022-09-13 op extern void bufferevent_read_pressure_cb(struct evbuffer *, size_t,
50 b0a6bcf7 2022-09-13 op size_t, void *);
52 b0a6bcf7 2022-09-13 op void proxy_init(struct privsep *, struct privsep_proc *, void *);
53 b0a6bcf7 2022-09-13 op int proxy_launch(struct galileo *);
54 b0a6bcf7 2022-09-13 op void proxy_inflight_dec(const char *);
55 b0a6bcf7 2022-09-13 op int proxy_dispatch_parent(int, struct privsep_proc *, struct imsg *);
56 c9dc4bc6 2022-09-13 op void proxy_translate_gemtext(struct client *);
57 b0a6bcf7 2022-09-13 op void proxy_resolved(struct asr_result *, void *);
58 b0a6bcf7 2022-09-13 op void proxy_connect(int, short, void *);
59 b0a6bcf7 2022-09-13 op void proxy_read(struct bufferevent *, void *);
60 b0a6bcf7 2022-09-13 op void proxy_write(struct bufferevent *, void *);
61 b0a6bcf7 2022-09-13 op void proxy_error(struct bufferevent *, short, void *);
62 b0a6bcf7 2022-09-13 op int proxy_bufferevent_add(struct event *, int);
63 b0a6bcf7 2022-09-13 op void proxy_tls_writecb(int, short, void *);
64 b0a6bcf7 2022-09-13 op void proxy_tls_readcb(int, short, void *);
66 b0a6bcf7 2022-09-13 op static struct privsep_proc procs[] = {
67 b0a6bcf7 2022-09-13 op { "parent", PROC_PARENT, proxy_dispatch_parent },
70 b0a6bcf7 2022-09-13 op volatile int proxy_clients;
71 b0a6bcf7 2022-09-13 op volatile int proxy_inflight;
72 b0a6bcf7 2022-09-13 op uint32_t proxy_fcg_id;
75 b0a6bcf7 2022-09-13 op proxy(struct privsep *ps, struct privsep_proc *p)
77 b0a6bcf7 2022-09-13 op proc_run(ps, p, procs, nitems(procs), proxy_init, NULL);
81 b0a6bcf7 2022-09-13 op proxy_init(struct privsep *ps, struct privsep_proc *p, void *arg)
83 b0a6bcf7 2022-09-13 op if (config_init(ps->ps_env) == -1)
84 b0a6bcf7 2022-09-13 op fatal("failed to initialize configuration");
86 b0a6bcf7 2022-09-13 op /* We use a custom shutdown callback */
87 b0a6bcf7 2022-09-13 op /* p->p_shutdown = proxy_shutdown */
89 b0a6bcf7 2022-09-13 op if (pledge("stdio recvfd unix inet dns", NULL) == -1)
90 b0a6bcf7 2022-09-13 op fatal("pledge");
94 b0a6bcf7 2022-09-13 op proxy_launch(struct galileo *env)
96 b0a6bcf7 2022-09-13 op event_add(&env->sc_evsock, NULL);
101 b0a6bcf7 2022-09-13 op proxy_purge(struct server *srv)
106 b0a6bcf7 2022-09-13 op proxy_inflight_dec(const char *why)
108 b0a6bcf7 2022-09-13 op proxy_inflight--;
109 b0a6bcf7 2022-09-13 op log_debug("%s: inflight decremented, now %d, %s",
110 b0a6bcf7 2022-09-13 op __func__, proxy_inflight, why);
114 b0a6bcf7 2022-09-13 op proxy_dispatch_parent(int fd, struct privsep_proc *p, struct imsg *imsg)
116 b0a6bcf7 2022-09-13 op struct privsep *ps = p->p_ps;
117 b0a6bcf7 2022-09-13 op struct galileo *env = ps->ps_env;
119 b0a6bcf7 2022-09-13 op switch (imsg->hdr.type) {
120 b0a6bcf7 2022-09-13 op case IMSG_CFG_SRV:
121 b0a6bcf7 2022-09-13 op if (config_getserver(env, imsg) == -1)
122 b0a6bcf7 2022-09-13 op fatal("config_getproxy");
124 b0a6bcf7 2022-09-13 op case IMSG_CFG_SOCK:
125 b0a6bcf7 2022-09-13 op /* XXX: improve */
127 b0a6bcf7 2022-09-13 op if (env->sc_sock_fd != -1) {
128 b0a6bcf7 2022-09-13 op event_del(&env->sc_evsock);
129 b0a6bcf7 2022-09-13 op close(env->sc_sock_fd);
132 b0a6bcf7 2022-09-13 op env->sc_sock_fd = config_getsock(env, imsg);
133 b0a6bcf7 2022-09-13 op if (env->sc_sock_fd == -1)
134 b0a6bcf7 2022-09-13 op fatal("config_getsock");
136 b0a6bcf7 2022-09-13 op event_set(&env->sc_evsock, env->sc_sock_fd,
137 ea8874f1 2022-09-13 op EV_READ | EV_PERSIST, fcgi_accept, env);
138 b0a6bcf7 2022-09-13 op event_add(&env->sc_evsock, NULL);
139 ea8874f1 2022-09-13 op evtimer_set(&env->sc_evpause, fcgi_accept, env);
141 b0a6bcf7 2022-09-13 op case IMSG_CFG_DONE:
142 b0a6bcf7 2022-09-13 op log_debug("config done!");
144 b0a6bcf7 2022-09-13 op case IMSG_CTL_START:
145 b0a6bcf7 2022-09-13 op proxy_launch(env);
148 b0a6bcf7 2022-09-13 op log_warnx("unknown message %d", imsg->hdr.type);
155 c9dc4bc6 2022-09-13 op static inline int
156 c9dc4bc6 2022-09-13 op printurl(struct client *clt, const char *str)
158 c9dc4bc6 2022-09-13 op for (; *str; ++str) {
159 c9dc4bc6 2022-09-13 op switch (*str) {
164 c9dc4bc6 2022-09-13 op if (clt_printf(clt, "%2X", (unsigned char)*str) == -1)
168 c9dc4bc6 2022-09-13 op if (clt_putc(clt, *str) == -1)
177 c9dc4bc6 2022-09-13 op static inline int
178 c9dc4bc6 2022-09-13 op htmlescape(struct client *clt, const char *str)
182 c9dc4bc6 2022-09-13 op for (; *str; ++str) {
183 c9dc4bc6 2022-09-13 op switch (*str) {
185 c9dc4bc6 2022-09-13 op r = clt_puts(clt, "<");
188 c9dc4bc6 2022-09-13 op r = clt_puts(clt, ">");
191 c9dc4bc6 2022-09-13 op r = clt_puts(clt, "&");
194 c9dc4bc6 2022-09-13 op r = clt_putc(clt, *str);
206 c9dc4bc6 2022-09-13 op gemtext_translate_line(struct client *clt, char *line)
208 c9dc4bc6 2022-09-13 op /* preformatted line / closing */
209 b9de0a74 2022-09-14 op if (clt->clt_translate & TR_PRE) {
210 c9dc4bc6 2022-09-13 op if (!strncmp(line, "```", 3)) {
211 b9de0a74 2022-09-14 op clt->clt_translate &= ~TR_PRE;
212 c9dc4bc6 2022-09-13 op return (clt_puts(clt, "</pre>"));
215 c9dc4bc6 2022-09-13 op if (htmlescape(clt, line) == -1)
217 c9dc4bc6 2022-09-13 op return (clt_putc(clt, '\n'));
221 b9de0a74 2022-09-14 op if (!strncmp(line, "* ", 2)) {
222 b9de0a74 2022-09-14 op if (clt->clt_translate & TR_NAV) {
223 b9de0a74 2022-09-14 op if (clt_puts(clt, "</ul></nav>") == -1)
225 b9de0a74 2022-09-14 op clt->clt_translate &= ~TR_NAV;
228 b9de0a74 2022-09-14 op if (!(clt->clt_translate & TR_LIST)) {
229 b9de0a74 2022-09-14 op if (clt_puts(clt, "<ul>") == -1)
231 b9de0a74 2022-09-14 op clt->clt_translate |= TR_LIST;
234 b9de0a74 2022-09-14 op if (clt_puts(clt, "<li>") == -1 ||
235 b9de0a74 2022-09-14 op htmlescape(clt, line + 2) == -1 ||
236 b9de0a74 2022-09-14 op clt_puts(clt, "</li>") == -1)
241 b9de0a74 2022-09-14 op if (clt->clt_translate & TR_LIST) {
242 b9de0a74 2022-09-14 op if (clt_puts(clt, "</ul>") == -1)
244 b9de0a74 2022-09-14 op clt->clt_translate &= ~TR_LIST;
247 b9de0a74 2022-09-14 op /* link -- TODO: relativify from SCRIPT_NAME */
248 b9de0a74 2022-09-14 op if (!strncmp(line, "=>", 2)) {
251 b9de0a74 2022-09-14 op if (!(clt->clt_translate & TR_NAV)) {
252 b9de0a74 2022-09-14 op if (clt_puts(clt, "<nav><ul>") == -1)
254 b9de0a74 2022-09-14 op clt->clt_translate |= TR_NAV;
258 b9de0a74 2022-09-14 op line += strspn(line, " \t");
260 b9de0a74 2022-09-14 op label = line + strcspn(line, " \t");
261 b9de0a74 2022-09-14 op if (*label == '\0')
262 b9de0a74 2022-09-14 op label = line;
264 b9de0a74 2022-09-14 op *label++ = '\0';
266 b9de0a74 2022-09-14 op if (clt_puts(clt, "<li><a href='") == -1 ||
267 b9de0a74 2022-09-14 op printurl(clt, line) == -1 ||
268 b9de0a74 2022-09-14 op clt_puts(clt, "'>") == -1 ||
269 b9de0a74 2022-09-14 op htmlescape(clt, label) == -1 ||
270 b9de0a74 2022-09-14 op clt_puts(clt, "</a></li>") == -1)
276 b9de0a74 2022-09-14 op if (clt->clt_translate & TR_NAV) {
277 b9de0a74 2022-09-14 op if (clt_puts(clt, "</ul></nav>") == -1)
279 b9de0a74 2022-09-14 op clt->clt_translate &= ~TR_NAV;
282 c9dc4bc6 2022-09-13 op /* pre opening */
283 c9dc4bc6 2022-09-13 op if (!strncmp(line, "```", 3)) {
284 b9de0a74 2022-09-14 op clt->clt_translate |= TR_PRE;
285 c9dc4bc6 2022-09-13 op return (clt_puts(clt, "<pre>"));
288 c9dc4bc6 2022-09-13 op /* citation block */
289 c9dc4bc6 2022-09-13 op if (*line == '>') {
290 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<blockquote>") == -1 ||
291 c9dc4bc6 2022-09-13 op htmlescape(clt, line + 1) == -1 ||
292 c9dc4bc6 2022-09-13 op clt_puts(clt, "</blockquote>") == -1)
297 c9dc4bc6 2022-09-13 op /* headings */
298 c9dc4bc6 2022-09-13 op if (!strncmp(line, "###", 3)) {
299 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<h3>") == -1 ||
300 c9dc4bc6 2022-09-13 op htmlescape(clt, line + 3) == -1 ||
301 c9dc4bc6 2022-09-13 op clt_puts(clt, "</h3>") == -1)
305 c9dc4bc6 2022-09-13 op if (!strncmp(line, "##", 2)) {
306 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<h2>") == -1 ||
307 c9dc4bc6 2022-09-13 op htmlescape(clt, line + 2) == -1 ||
308 c9dc4bc6 2022-09-13 op clt_puts(clt, "</h2>") == -1)
312 c9dc4bc6 2022-09-13 op if (!strncmp(line, "#", 1)) {
313 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<h1>") == -1 ||
314 c9dc4bc6 2022-09-13 op htmlescape(clt, line + 1) == -1 ||
315 c9dc4bc6 2022-09-13 op clt_puts(clt, "</h1>") == -1)
320 df5279ca 2022-09-14 op /* Not following strictly the gemini specification... */
321 df5279ca 2022-09-14 op if (*line == '\0')
324 c9dc4bc6 2022-09-13 op /* paragraph */
325 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "<p>") == -1 ||
326 c9dc4bc6 2022-09-13 op htmlescape(clt, line) == -1 ||
327 c9dc4bc6 2022-09-13 op clt_puts(clt, "</p>") == -1)
334 c9dc4bc6 2022-09-13 op proxy_translate_gemtext(struct client *clt)
336 c9dc4bc6 2022-09-13 op struct bufferevent *bev = clt->clt_bev;
337 c9dc4bc6 2022-09-13 op struct evbuffer *src = EVBUFFER_INPUT(bev);
343 b9de0a74 2022-09-14 op line = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF);
344 c9dc4bc6 2022-09-13 op if (line == NULL)
347 c9dc4bc6 2022-09-13 op r = gemtext_translate_line(clt, line);
354 b0a6bcf7 2022-09-13 op static struct proxy_config *
355 b0a6bcf7 2022-09-13 op proxy_server_match(struct galileo *env, struct client *clt)
357 b0a6bcf7 2022-09-13 op struct server *srv;
359 b0a6bcf7 2022-09-13 op if (clt->clt_server_name == NULL)
362 b0a6bcf7 2022-09-13 op TAILQ_FOREACH(srv, &env->sc_servers, srv_entry) {
363 b0a6bcf7 2022-09-13 op if (!strcmp(clt->clt_server_name, srv->srv_conf.host))
364 b0a6bcf7 2022-09-13 op return &srv->srv_conf;
371 b0a6bcf7 2022-09-13 op proxy_start_request(struct galileo *env, struct client *clt)
373 b0a6bcf7 2022-09-13 op struct addrinfo hints;
374 b0a6bcf7 2022-09-13 op struct asr_query *query;
375 b0a6bcf7 2022-09-13 op char port[32];
377 b0a6bcf7 2022-09-13 op if ((clt->clt_pc = proxy_server_match(env, clt)) == NULL) {
378 b0a6bcf7 2022-09-13 op if (clt_printf(clt, "Status: 501\r\n\r\n") == -1)
380 b0a6bcf7 2022-09-13 op fcgi_end_request(clt, 1);
384 b0a6bcf7 2022-09-13 op (void)snprintf(port, sizeof(port), "%d", clt->clt_pc->proxy_port);
386 b0a6bcf7 2022-09-13 op memset(&hints, 0, sizeof(hints));
387 b0a6bcf7 2022-09-13 op hints.ai_family = AF_UNSPEC;
388 b0a6bcf7 2022-09-13 op hints.ai_socktype = SOCK_STREAM;
390 b0a6bcf7 2022-09-13 op query = getaddrinfo_async(clt->clt_pc->proxy_addr, port, &hints, NULL);
391 b0a6bcf7 2022-09-13 op if (query == NULL) {
392 b0a6bcf7 2022-09-13 op log_warn("getaddrinfo_async");
393 b0a6bcf7 2022-09-13 op fcgi_abort_request(clt);
397 b0a6bcf7 2022-09-13 op clt->clt_evasr = event_asr_run(query, proxy_resolved, clt);
398 b0a6bcf7 2022-09-13 op if (clt->clt_evasr == NULL) {
399 b0a6bcf7 2022-09-13 op log_warn("event_asr_run");
400 b0a6bcf7 2022-09-13 op asr_abort(query);
401 b0a6bcf7 2022-09-13 op fcgi_abort_request(clt);
407 b0a6bcf7 2022-09-13 op proxy_resolved(struct asr_result *res, void *d)
409 b0a6bcf7 2022-09-13 op struct client *clt = d;
410 b0a6bcf7 2022-09-13 op struct proxy_config *pc = clt->clt_pc;
412 b0a6bcf7 2022-09-13 op clt->clt_evasr = NULL;
414 b0a6bcf7 2022-09-13 op if (res->ar_gai_errno != 0) {
415 b0a6bcf7 2022-09-13 op log_warnx("failed to resolve %s:%d: %s",
416 b0a6bcf7 2022-09-13 op pc->proxy_addr, pc->proxy_port,
417 b0a6bcf7 2022-09-13 op gai_strerror(res->ar_gai_errno));
418 b0a6bcf7 2022-09-13 op if (clt_printf(clt, "Status: 501\r\n") == -1)
420 b0a6bcf7 2022-09-13 op if (clt_printf(clt, "Content-Type: text/plain\r\n") == -1)
422 b0a6bcf7 2022-09-13 op if (clt_printf(clt, "Proxy error; connection failed") == -1)
424 b0a6bcf7 2022-09-13 op fcgi_end_request(clt, 1);
428 b0a6bcf7 2022-09-13 op clt->clt_addrinfo = res->ar_addrinfo;
429 b0a6bcf7 2022-09-13 op clt->clt_p = clt->clt_addrinfo;
430 b0a6bcf7 2022-09-13 op proxy_connect(-1, 0, clt);
434 b0a6bcf7 2022-09-13 op proxy_connect(int fd, short ev, void *d)
436 b0a6bcf7 2022-09-13 op struct client *clt = d;
437 b0a6bcf7 2022-09-13 op struct evbuffer *out;
438 b0a6bcf7 2022-09-13 op struct addrinfo *p;
439 b0a6bcf7 2022-09-13 op struct tls_config *conf;
440 b0a6bcf7 2022-09-13 op struct timeval conntv = {5, 0};
442 b0a6bcf7 2022-09-13 op socklen_t len = sizeof(err);
445 b0a6bcf7 2022-09-13 op if (clt->clt_p == NULL)
448 b0a6bcf7 2022-09-13 op if (clt->clt_fd != -1) {
449 b0a6bcf7 2022-09-13 op if (getsockopt(clt->clt_fd, SOL_SOCKET, SO_ERROR, &err, &len)
452 b0a6bcf7 2022-09-13 op if (err != 0) {
459 b0a6bcf7 2022-09-13 op p = clt->clt_p;
460 b0a6bcf7 2022-09-13 op clt->clt_fd = socket(p->ai_family, p->ai_socktype | SOCK_NONBLOCK,
461 b0a6bcf7 2022-09-13 op p->ai_protocol);
462 b0a6bcf7 2022-09-13 op if (clt->clt_fd == -1) {
463 b0a6bcf7 2022-09-13 op clt->clt_p = clt->clt_p->ai_next;
467 b0a6bcf7 2022-09-13 op if (connect(clt->clt_fd, p->ai_addr, p->ai_addrlen) == 0)
470 b0a6bcf7 2022-09-13 op clt->clt_evconn_live = 1;
471 b0a6bcf7 2022-09-13 op event_set(&clt->clt_evconn, clt->clt_fd, EV_WRITE, proxy_connect, clt);
472 b0a6bcf7 2022-09-13 op event_add(&clt->clt_evconn, &conntv);
476 b0a6bcf7 2022-09-13 op clt->clt_evconn_live = 0;
477 b0a6bcf7 2022-09-13 op freeaddrinfo(clt->clt_addrinfo);
478 b0a6bcf7 2022-09-13 op clt->clt_addrinfo = clt->clt_p = NULL;
480 b0a6bcf7 2022-09-13 op /* initialize TLS for Gemini */
481 b0a6bcf7 2022-09-13 op if ((conf = tls_config_new()) == NULL) {
482 b0a6bcf7 2022-09-13 op log_warn("tls_config_new failed");
486 b0a6bcf7 2022-09-13 op tls_config_insecure_noverifycert(conf);
488 b0a6bcf7 2022-09-13 op if ((clt->clt_ctx = tls_client()) == NULL) {
489 b0a6bcf7 2022-09-13 op log_warnx("tls_client failed");
490 b0a6bcf7 2022-09-13 op tls_config_free(conf);
494 b0a6bcf7 2022-09-13 op if (tls_configure(clt->clt_ctx, conf) == -1) {
495 b0a6bcf7 2022-09-13 op log_warnx("tls_configure failed");
496 b0a6bcf7 2022-09-13 op tls_config_free(conf);
500 b0a6bcf7 2022-09-13 op tls_config_free(conf);
502 b0a6bcf7 2022-09-13 op if (tls_connect_socket(clt->clt_ctx, clt->clt_fd,
503 b0a6bcf7 2022-09-13 op clt->clt_pc->proxy_name) == -1) {
504 b0a6bcf7 2022-09-13 op log_warnx("tls_connect_socket failed");
508 b0a6bcf7 2022-09-13 op clt->clt_bev = bufferevent_new(clt->clt_fd, proxy_read, proxy_write,
509 b0a6bcf7 2022-09-13 op proxy_error, clt);
510 b0a6bcf7 2022-09-13 op if (clt->clt_bev == NULL) {
511 b0a6bcf7 2022-09-13 op log_warn("bufferevent_new");
514 b0a6bcf7 2022-09-13 op out = EVBUFFER_OUTPUT(clt->clt_bev);
516 b0a6bcf7 2022-09-13 op event_set(&clt->clt_bev->ev_read, clt->clt_fd, EV_READ,
517 b0a6bcf7 2022-09-13 op proxy_tls_readcb, clt->clt_bev);
518 b0a6bcf7 2022-09-13 op event_set(&clt->clt_bev->ev_write, clt->clt_fd, EV_WRITE,
519 b0a6bcf7 2022-09-13 op proxy_tls_writecb, clt->clt_bev);
521 b0a6bcf7 2022-09-13 op /* bufferevent_settimeout(); */
522 b0a6bcf7 2022-09-13 op bufferevent_enable(clt->clt_bev, EV_READ|EV_WRITE);
524 b0a6bcf7 2022-09-13 op /* TODO: compute the URL */
525 ee80262d 2022-09-13 op if (evbuffer_add_printf(out, "gemini://%s/%s\r\n",
526 ee80262d 2022-09-13 op clt->clt_pc->proxy_name, clt->clt_path_info) == -1) {
527 b0a6bcf7 2022-09-13 op log_warn("bufferevent_printf failed");
534 b0a6bcf7 2022-09-13 op log_warn("failed to connect to %s:%d",
535 b0a6bcf7 2022-09-13 op clt->clt_pc->proxy_addr, clt->clt_pc->proxy_port);
536 b0a6bcf7 2022-09-13 op if (clt_printf(clt, "Status: 501\r\n") == -1)
538 b0a6bcf7 2022-09-13 op if (clt_printf(clt, "Content-Type: text/plain\r\n") == -1)
540 b0a6bcf7 2022-09-13 op if (clt_printf(clt, "Proxy error; connection failed") == -1)
542 b0a6bcf7 2022-09-13 op fcgi_end_request(clt, 1);
546 b0a6bcf7 2022-09-13 op proxy_read(struct bufferevent *bev, void *d)
548 b0a6bcf7 2022-09-13 op struct client *clt = d;
549 fc1cb9ea 2022-09-14 op struct proxy_config *pc = clt->clt_pc;
550 b0a6bcf7 2022-09-13 op struct evbuffer *src = EVBUFFER_INPUT(bev);
551 c9dc4bc6 2022-09-13 op const char *ctype;
556 b0a6bcf7 2022-09-13 op if (clt->clt_headersdone) {
558 c9dc4bc6 2022-09-13 op if (clt->clt_translate)
559 c9dc4bc6 2022-09-13 op proxy_translate_gemtext(clt);
561 c9dc4bc6 2022-09-13 op clt_write_bufferevent(clt, bev);
565 b0a6bcf7 2022-09-13 op hdr = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF_STRICT);
566 b0a6bcf7 2022-09-13 op if (hdr == NULL) {
567 b0a6bcf7 2022-09-13 op if (EVBUFFER_LENGTH(src) >= 1026)
568 b0a6bcf7 2022-09-13 op proxy_error(bev, EV_READ, clt);
572 b0a6bcf7 2022-09-13 op if (len < 4 ||
573 b0a6bcf7 2022-09-13 op !isdigit((unsigned char)hdr[0]) ||
574 b0a6bcf7 2022-09-13 op !isdigit((unsigned char)hdr[1]) ||
575 b0a6bcf7 2022-09-13 op hdr[2] != ' ') {
576 b0a6bcf7 2022-09-13 op log_warnx("invalid ");
578 b0a6bcf7 2022-09-13 op proxy_error(bev, EV_READ, clt);
582 b0a6bcf7 2022-09-13 op code = (hdr[0] - '0') * 10 + (hdr[1] - '0');
583 b0a6bcf7 2022-09-13 op if (code != 20) {
584 b0a6bcf7 2022-09-13 op log_warnx("un-handled gemini reply status %d", code);
586 b0a6bcf7 2022-09-13 op proxy_error(bev, EV_READ, clt);
590 c9dc4bc6 2022-09-13 op if (!strncmp(&hdr[3], "text/gemini", 11)) {
591 c9dc4bc6 2022-09-13 op ctype = "text/html; charset=utf8";
592 b9de0a74 2022-09-14 op clt->clt_translate = TR_ENABLED;
594 c9dc4bc6 2022-09-13 op ctype = &hdr[3];
596 c9dc4bc6 2022-09-13 op if (clt_printf(clt, "Content-Type: %s\r\n", ctype) == -1)
598 b0a6bcf7 2022-09-13 op if (clt_printf(clt, "\r\n") == -1)
601 b0a6bcf7 2022-09-13 op clt->clt_headersdone = 1;
603 c9dc4bc6 2022-09-13 op if (clt->clt_translate) {
604 fc1cb9ea 2022-09-14 op if (clt_puts(clt, "<!doctype html><html><head>") == -1)
606 fc1cb9ea 2022-09-14 op if (*pc->stylesheet != '\0' &&
607 fc1cb9ea 2022-09-14 op clt_printf(clt, "<link rel='stylesheet' href='%s' />",
608 fc1cb9ea 2022-09-14 op pc->stylesheet) == -1)
610 fc1cb9ea 2022-09-14 op if (clt_puts(clt, "</head><body>") == -1)
618 b0a6bcf7 2022-09-13 op proxy_write(struct bufferevent *bev, void *d)
624 b0a6bcf7 2022-09-13 op proxy_error(struct bufferevent *bev, short err, void *d)
626 b0a6bcf7 2022-09-13 op struct client *clt = d;
627 b0a6bcf7 2022-09-13 op int status = !(err & EVBUFFER_EOF);
629 b0a6bcf7 2022-09-13 op log_debug("proxy error, shutting down the connection (err: %x)",
632 b0a6bcf7 2022-09-13 op if (!clt->clt_headersdone) {
633 b0a6bcf7 2022-09-13 op if (clt_printf(clt, "Status: 501\r\n") == -1)
635 b0a6bcf7 2022-09-13 op if (clt_printf(clt, "Content-Type: text/plain\r\n") == -1)
637 b0a6bcf7 2022-09-13 op if (clt_printf(clt, "Proxy error\n") == -1)
639 c9dc4bc6 2022-09-13 op } else if (status == 0) {
640 c9dc4bc6 2022-09-13 op if (clt_puts(clt, "</body></html>") == -1)
644 b0a6bcf7 2022-09-13 op fcgi_end_request(clt, status);
648 b0a6bcf7 2022-09-13 op proxy_tls_readcb(int fd, short event, void *arg)
650 b0a6bcf7 2022-09-13 op struct bufferevent *bufev = arg;
651 b0a6bcf7 2022-09-13 op struct client *clt = bufev->cbarg;
652 b0a6bcf7 2022-09-13 op char rbuf[IBUF_READ_SIZE];
653 b0a6bcf7 2022-09-13 op int what = EVBUFFER_READ;
654 b0a6bcf7 2022-09-13 op int howmuch = IBUF_READ_SIZE;
658 b0a6bcf7 2022-09-13 op if (event == EV_TIMEOUT) {
659 b0a6bcf7 2022-09-13 op what |= EVBUFFER_TIMEOUT;
663 b0a6bcf7 2022-09-13 op if (bufev->wm_read.high != 0)
664 b0a6bcf7 2022-09-13 op howmuch = MINIMUM(sizeof(rbuf), bufev->wm_read.high);
666 b0a6bcf7 2022-09-13 op ret = tls_read(clt->clt_ctx, rbuf, howmuch);
667 b0a6bcf7 2022-09-13 op if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) {
669 b0a6bcf7 2022-09-13 op } else if (ret == -1) {
670 b0a6bcf7 2022-09-13 op what |= EVBUFFER_ERROR;
675 b0a6bcf7 2022-09-13 op if (len == 0) {
676 b0a6bcf7 2022-09-13 op what |= EVBUFFER_EOF;
680 b0a6bcf7 2022-09-13 op if (evbuffer_add(bufev->input, rbuf, len) == -1) {
681 b0a6bcf7 2022-09-13 op what |= EVBUFFER_ERROR;
685 b0a6bcf7 2022-09-13 op proxy_bufferevent_add(&bufev->ev_read, bufev->timeout_read);
687 b0a6bcf7 2022-09-13 op len = EVBUFFER_LENGTH(bufev->input);
688 b0a6bcf7 2022-09-13 op if (bufev->wm_read.low != 0 && len < bufev->wm_read.low)
690 b0a6bcf7 2022-09-13 op if (bufev->wm_read.high != 0 && len > bufev->wm_read.high) {
691 b0a6bcf7 2022-09-13 op struct evbuffer *buf = bufev->input;
692 b0a6bcf7 2022-09-13 op event_del(&bufev->ev_read);
693 b0a6bcf7 2022-09-13 op evbuffer_setcb(buf, bufferevent_read_pressure_cb, bufev);
697 b0a6bcf7 2022-09-13 op if (bufev->readcb != NULL)
698 b0a6bcf7 2022-09-13 op (*bufev->readcb)(bufev, bufev->cbarg);
702 b0a6bcf7 2022-09-13 op proxy_bufferevent_add(&bufev->ev_read, bufev->timeout_read);
706 b0a6bcf7 2022-09-13 op (*bufev->errorcb)(bufev, what, bufev->cbarg);
710 b0a6bcf7 2022-09-13 op proxy_bufferevent_add(struct event *ev, int timeout)
712 b0a6bcf7 2022-09-13 op struct timeval tv, *ptv = NULL;
714 b0a6bcf7 2022-09-13 op if (timeout) {
715 b0a6bcf7 2022-09-13 op timerclear(&tv);
716 b0a6bcf7 2022-09-13 op tv.tv_sec = timeout;
720 b0a6bcf7 2022-09-13 op return (event_add(ev, ptv));
724 b0a6bcf7 2022-09-13 op proxy_tls_writecb(int fd, short event, void *arg)
726 b0a6bcf7 2022-09-13 op struct bufferevent *bufev = arg;
727 b0a6bcf7 2022-09-13 op struct client *clt = bufev->cbarg;
729 b0a6bcf7 2022-09-13 op short what = EVBUFFER_WRITE;
732 b0a6bcf7 2022-09-13 op if (event == EV_TIMEOUT) {
733 b0a6bcf7 2022-09-13 op what |= EVBUFFER_TIMEOUT;
737 b0a6bcf7 2022-09-13 op if (EVBUFFER_LENGTH(bufev->output)) {
738 b0a6bcf7 2022-09-13 op ret = tls_write(clt->clt_ctx,
739 b0a6bcf7 2022-09-13 op EVBUFFER_DATA(bufev->output),
740 b0a6bcf7 2022-09-13 op EVBUFFER_LENGTH(bufev->output));
741 b0a6bcf7 2022-09-13 op if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) {
743 b0a6bcf7 2022-09-13 op } else if (ret == -1) {
744 b0a6bcf7 2022-09-13 op what |= EVBUFFER_ERROR;
748 b0a6bcf7 2022-09-13 op evbuffer_drain(bufev->output, len);
751 b0a6bcf7 2022-09-13 op if (EVBUFFER_LENGTH(bufev->output) != 0)
752 b0a6bcf7 2022-09-13 op proxy_bufferevent_add(&bufev->ev_write, bufev->timeout_write);
754 b0a6bcf7 2022-09-13 op if (bufev->writecb != NULL &&
755 b0a6bcf7 2022-09-13 op EVBUFFER_LENGTH(bufev->output) <= bufev->wm_write.low)
756 b0a6bcf7 2022-09-13 op (*bufev->writecb)(bufev, bufev->cbarg);
760 b0a6bcf7 2022-09-13 op proxy_bufferevent_add(&bufev->ev_write, bufev->timeout_write);
764 b0a6bcf7 2022-09-13 op (*bufev->errorcb)(bufev, what, bufev->cbarg);
768 b0a6bcf7 2022-09-13 op proxy_client_free(struct client *clt)
770 b0a6bcf7 2022-09-13 op if (clt->clt_evasr)
771 b0a6bcf7 2022-09-13 op event_asr_abort(clt->clt_evasr);
773 b0a6bcf7 2022-09-13 op if (clt->clt_addrinfo)
774 b0a6bcf7 2022-09-13 op freeaddrinfo(clt->clt_addrinfo);
776 b0a6bcf7 2022-09-13 op if (clt->clt_evconn_live)
777 b0a6bcf7 2022-09-13 op event_del(&clt->clt_evconn);
779 b0a6bcf7 2022-09-13 op if (clt->clt_fd != -1)
780 b0a6bcf7 2022-09-13 op close(clt->clt_fd);
782 b0a6bcf7 2022-09-13 op if (clt->clt_ctx)
783 b0a6bcf7 2022-09-13 op tls_free(clt->clt_ctx);
785 b0a6bcf7 2022-09-13 op if (clt->clt_bev)
786 b0a6bcf7 2022-09-13 op bufferevent_free(clt->clt_bev);
788 b0a6bcf7 2022-09-13 op free(clt->clt_server_name);
789 b0a6bcf7 2022-09-13 op free(clt->clt_script_name);
790 b0a6bcf7 2022-09-13 op free(clt->clt_path_info);