2 * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22 * to something more asynchronous
25 #include "telescope.h"
27 #include <sys/types.h>
28 #include <sys/socket.h>
30 #include <netinet/in.h>
47 static struct event imsgev;
48 static struct tls_config *tlsconf;
49 static struct imsgbuf *ibuf;
53 static void die(void) __attribute__((__noreturn__));
55 static void try_to_connect(int, short, void*);
58 static void query_done(struct asr_result*, void*);
59 static void async_conn_towards(struct req*);
61 static void blocking_conn_towards(struct req*);
64 static void close_with_err(struct req*, const char*);
65 static void close_with_errf(struct req*, const char*, ...) __attribute__((format(printf, 2, 3)));
66 static struct req *req_by_id(uint32_t);
67 static struct req *req_by_id_try(uint32_t);
69 static void setup_tls(struct req*);
70 static void do_handshake(int, short, void*);
71 static void write_request(int, short, void*);
72 static void read_reply(int, short, void*);
73 static void parse_reply(struct req*);
74 static void copy_body(int, short, void*);
76 static void handle_get(struct imsg*, size_t);
77 static void handle_cert_status(struct imsg*, size_t);
78 static void handle_proceed(struct imsg*, size_t);
79 static void handle_stop(struct imsg*, size_t);
80 static void handle_quit(struct imsg*, size_t);
81 static void handle_dispatch_imsg(int, short, void*);
83 /* TODO: making this customizable */
84 struct timeval timeout_for_handshake = { 5, 0 };
86 static imsg_handlerfn *handlers[] = {
87 [IMSG_GET] = handle_get,
88 [IMSG_CERT_STATUS] = handle_cert_status,
89 [IMSG_PROCEED] = handle_proceed,
90 [IMSG_STOP] = handle_stop,
91 [IMSG_QUIT] = handle_quit,
94 typedef void (*statefn)(int, short, void*);
96 TAILQ_HEAD(, req) reqhead;
97 /* a pending request */
107 struct addrinfo *servinfo, *p;
109 struct addrinfo hints;
110 struct event_asr *asrev;
113 TAILQ_ENTRY(req) reqs;
117 yield_r(struct req *req, statefn fn, struct timeval *tv)
119 event_once(req->fd, EV_READ, fn, req, tv);
123 yield_w(struct req *req, statefn fn, struct timeval *tv)
125 event_once(req->fd, EV_WRITE, fn, req, tv);
129 advance_buf(struct req *req, size_t len)
131 assert(len <= req->off);
134 memmove(req->buf, req->buf + len, req->off);
137 static void __attribute__((__noreturn__))
144 try_to_connect(int fd, short ev, void *d)
148 socklen_t len = sizeof(error);
155 if (getsockopt(req->fd, SOL_SOCKET, SO_ERROR, &error, &len) == -1)
164 req->fd = socket(req->p->ai_family, req->p->ai_socktype, req->p->ai_protocol);
166 req->p = req->p->ai_next;
169 mark_nonblock(req->fd);
170 if (connect(req->fd, req->p->ai_addr, req->p->ai_addrlen) == 0)
172 yield_w(req, try_to_connect, NULL);
177 freeaddrinfo(req->servinfo);
178 close_with_errf(req, "failed to connect to %s",
183 freeaddrinfo(req->servinfo);
189 query_done(struct asr_result *res, void *d)
194 if (res->ar_gai_errno != 0) {
195 close_with_errf(req, "failed to resolve %s: %s",
196 req->url.host, gai_strerror(res->ar_gai_errno));
201 req->servinfo = res->ar_addrinfo;
202 req->p = res->ar_addrinfo;
203 try_to_connect(0, 0, req);
207 async_conn_towards(struct req *req)
210 const char *proto = "1965";
212 if (*req->url.port != '\0')
213 proto = req->url.port;
215 req->hints.ai_family = AF_UNSPEC;
216 req->hints.ai_socktype = SOCK_STREAM;
217 q = getaddrinfo_async(req->url.host, proto, &req->hints, NULL);
218 req->asrev = event_asr_run(q, query_done, req);
222 blocking_conn_towards(struct req *req)
224 struct addrinfo hints;
225 struct phos_uri *url = &req->url;
227 const char *proto = "1965";
229 if (*url->port != '\0')
232 memset(&hints, 0, sizeof(hints));
233 hints.ai_family = AF_UNSPEC;
234 hints.ai_socktype = SOCK_STREAM;
236 if ((status = getaddrinfo(url->host, proto, &hints, &req->servinfo))) {
237 close_with_errf(req, "failed to resolve %s: %s",
238 url->host, gai_strerror(status));
243 req->p = req->servinfo;
244 try_to_connect(0, 0, req);
249 req_by_id(uint32_t id)
253 if ((r = req_by_id_try(id)) == NULL)
259 req_by_id_try(uint32_t id)
263 TAILQ_FOREACH(r, &reqhead, reqs) {
272 close_conn(int fd, short ev, void *d)
277 if (req->asrev != NULL)
278 event_asr_abort(req->asrev);
281 if (req->ctx != NULL) {
282 switch (tls_close(req->ctx)) {
283 case TLS_WANT_POLLIN:
284 yield_r(req, close_conn, NULL);
286 case TLS_WANT_POLLOUT:
287 yield_w(req, close_conn, NULL);
294 TAILQ_REMOVE(&reqhead, req, reqs);
301 close_with_err(struct req *req, const char *err)
303 imsg_compose(ibuf, IMSG_ERR, req->id, 0, -1, err, strlen(err)+1);
305 close_conn(0, 0, req);
309 close_with_errf(struct req *req, const char *fmt, ...)
315 if (vasprintf(&s, fmt, ap) == -1)
319 close_with_err(req, s);
324 setup_tls(struct req *req)
326 if ((req->ctx = tls_client()) == NULL) {
327 close_with_errf(req, "tls_client: %s", strerror(errno));
330 if (tls_configure(req->ctx, tlsconf) == -1) {
331 close_with_errf(req, "tls_configure: %s", tls_error(req->ctx));
334 if (tls_connect_socket(req->ctx, req->fd, req->url.host) == -1) {
335 close_with_errf(req, "tls_connect_socket: %s", tls_error(req->ctx));
338 yield_w(req, do_handshake, &timeout_for_handshake);
342 do_handshake(int fd, short ev, void *d)
347 if (ev == EV_TIMEOUT) {
348 close_with_err(req, "Timeout loading page");
352 switch (tls_handshake(req->ctx)) {
353 case TLS_WANT_POLLIN:
354 yield_r(req, do_handshake, NULL);
356 case TLS_WANT_POLLOUT:
357 yield_w(req, do_handshake, NULL);
361 hash = tls_peer_cert_hash(req->ctx);
363 close_with_errf(req, "handshake failed: %s", tls_error(req->ctx));
366 imsg_compose(ibuf, IMSG_CHECK_CERT, req->id, 0, -1, hash, strlen(hash)+1);
371 write_request(int fd, short ev, void *d)
376 char buf[1027]; /* URL + \r\n\0 */
378 if (!phos_serialize_uri(&req->url, buf, sizeof(buf)))
381 len = strlcat(buf, "\r\n", sizeof(buf));
383 assert(len <= sizeof(buf));
385 switch (r = tls_write(req->ctx, buf, len)) {
387 close_with_errf(req, "tls_write: %s", tls_error(req->ctx));
389 case TLS_WANT_POLLIN:
390 yield_r(req, write_request, NULL);
392 case TLS_WANT_POLLOUT:
393 yield_w(req, write_request, NULL);
396 /* assume r == len */
398 yield_r(req, read_reply, NULL);
404 read_reply(int fd, short ev, void *d)
411 buf = req->buf + req->off;
412 len = sizeof(req->buf) - req->off;
414 switch (r = tls_read(req->ctx, buf, len)) {
416 close_with_errf(req, "tls_read: %s", tls_error(req->ctx));
418 case TLS_WANT_POLLIN:
419 yield_r(req, read_reply, NULL);
421 case TLS_WANT_POLLOUT:
422 yield_w(req, read_reply, NULL);
427 if (memmem(req->buf, req->off, "\r\n", 2) != NULL)
429 else if (req->off == sizeof(req->buf))
430 close_with_err(req, "invalid response");
432 yield_r(req, read_reply, NULL);
438 parse_reply(struct req *req)
447 if (!isdigit(req->buf[0]) || !isdigit(req->buf[1]))
450 code = (req->buf[0] - '0')*10 + (req->buf[1] - '0');
452 if (!isspace(req->buf[2]))
456 if ((e = memmem(req->buf, req->off, "\r\n", 2)) == NULL)
462 imsg_compose(ibuf, IMSG_GOT_CODE, req->id, 0, -1, &code, sizeof(code));
463 imsg_compose(ibuf, IMSG_GOT_META, req->id, 0, -1, req->buf, len);
466 if (20 <= code && code < 30)
467 advance_buf(req, len+1); /* skip \n too */
469 close_conn(0, 0, req);
474 close_with_err(req, "malformed request");
478 copy_body(int fd, short ev, void *d)
485 imsg_compose(ibuf, IMSG_BUF, req->id, 0, -1,
491 switch (r = tls_read(req->ctx, req->buf, sizeof(req->buf))) {
492 case TLS_WANT_POLLIN:
493 yield_r(req, copy_body, NULL);
495 case TLS_WANT_POLLOUT:
496 yield_w(req, copy_body, NULL);
499 imsg_compose(ibuf, IMSG_EOF, req->id, 0, -1, NULL, 0);
501 close_conn(0, 0, req);
510 handle_get(struct imsg *imsg, size_t datalen)
517 if (data[datalen-1] != '\0')
520 if ((req = calloc(1, sizeof(*req))) == NULL)
523 req->id = imsg->hdr.peerid;
524 TAILQ_INSERT_HEAD(&reqhead, req, reqs);
526 if (!phos_parse_absolute_uri(data, &req->url)) {
527 close_with_err(req, "Can't parse URI");
532 async_conn_towards(req);
534 blocking_conn_towards(req);
539 handle_cert_status(struct imsg *imsg, size_t datalen)
544 req = req_by_id(imsg->hdr.peerid);
546 if (datalen < sizeof(is_ok))
548 memcpy(&is_ok, imsg->data, sizeof(is_ok));
551 yield_w(req, write_request, NULL);
553 close_conn(0, 0, req);
557 handle_proceed(struct imsg *imsg, size_t datalen)
559 yield_r(req_by_id(imsg->hdr.peerid),
564 handle_stop(struct imsg *imsg, size_t datalen)
568 if ((req = req_by_id_try(imsg->hdr.peerid)) == NULL)
570 close_conn(0, 0, req);
574 handle_quit(struct imsg *imsg, size_t datalen)
580 handle_dispatch_imsg(int fd, short ev, void *d)
582 struct imsgbuf *ibuf = d;
583 dispatch_imsg(ibuf, handlers, sizeof(handlers));
587 client_main(struct imsgbuf *b)
591 TAILQ_INIT(&reqhead);
593 if ((tlsconf = tls_config_new()) == NULL)
595 tls_config_insecure_noverifycert(tlsconf);
596 tls_config_insecure_noverifyname(tlsconf);
600 event_set(&imsgev, ibuf->fd, EV_READ | EV_PERSIST, handle_dispatch_imsg, ibuf);
601 event_add(&imsgev, NULL);
603 sandbox_network_process();