2 * libwebsockets-test-server - libwebsockets test implementation
4 * Copyright (C) 2010-2016 Andy Green <andy@warmcat.com>
6 * This file is made available under the Creative Commons CC0 1.0
7 * Universal Public Domain Dedication.
9 * The person who associated a work with this deed has dedicated
10 * the work to the public domain by waiving all of his or her rights
11 * to the work worldwide under copyright law, including all related
12 * and neighboring rights, to the extent allowed by law. You can copy,
13 * modify, distribute and perform the work, even for commercial purposes,
14 * all without asking permission.
16 * The test apps are intended to be adapted for use in your code, which
17 * may be proprietary. So unlike the library itself, they are licensed
20 #include "test-server.h"
23 * This demo server shows how to use libwebsockets for one or more
24 * websocket protocols in the same server
26 * It defines the following websocket protocols:
28 * dumb-increment-protocol: once the socket is opened, an incrementing
29 * ascii string is sent down it every 50ms.
30 * If you send "reset\n" on the websocket, then
31 * the incrementing number is reset to 0.
33 * lws-mirror-protocol: copies any received packet to every connection also
34 * using this protocol, including the sender
37 extern int debug_level;
43 PROTOCOL_DUMB_INCREMENT,
51 * We take a strict whitelist approach to stop ../ attacks
59 * this is just an example of parsing handshake headers, you don't need this
60 * in your code unless you will filter allowing connections by the header
64 dump_handshake_info(struct lws *wsi)
68 const unsigned char *c;
71 c = lws_token_to_string(n);
77 len = lws_hdr_total_length(wsi, n);
78 if (!len || len > sizeof(buf) - 1) {
83 lws_hdr_copy(wsi, buf, sizeof buf, n);
84 buf[sizeof(buf) - 1] = '\0';
86 fprintf(stderr, " %s = %s\n", (char *)c, buf);
91 const char * get_mimetype(const char *file)
98 if (!strcmp(&file[n - 4], ".ico"))
99 return "image/x-icon";
101 if (!strcmp(&file[n - 4], ".png"))
104 if (!strcmp(&file[n - 5], ".html"))
110 /* this protocol server (always the first one) handles HTTP,
112 * Some misc callbacks that aren't associated with a protocol also turn up only
113 * here on the first protocol server.
116 int callback_http(struct lws *wsi, enum lws_callback_reasons reason, void *user,
117 void *in, size_t len)
119 struct per_session_data__http *pss =
120 (struct per_session_data__http *)user;
121 unsigned char buffer[4096 + LWS_PRE];
122 unsigned long amount, file_len, sent;
123 char leaf_path[1024];
124 const char *mimetype;
133 struct lws_pollargs *pa = (struct lws_pollargs *)in;
137 case LWS_CALLBACK_HTTP:
139 if (debug_level & LLL_INFO) {
140 dump_handshake_info(wsi);
142 /* dump the individual URI Arg parameters */
144 while (lws_hdr_copy_fragment(wsi, buf, sizeof(buf),
145 WSI_TOKEN_HTTP_URI_ARGS, n) > 0) {
146 lwsl_notice("URI Arg %d: %s\n", ++n, buf);
151 char name[100], rip[50];
152 lws_get_peer_addresses(wsi, lws_get_socket_fd(wsi), name,
153 sizeof(name), rip, sizeof(rip));
154 sprintf(buf, "%s (%s)", name, rip);
155 lwsl_notice("HTTP connect from %s\n", buf);
159 lws_return_http_status(wsi,
160 HTTP_STATUS_BAD_REQUEST, NULL);
164 /* this example server has no concept of directories */
165 if (strchr((const char *)in + 1, '/')) {
166 lws_return_http_status(wsi, HTTP_STATUS_FORBIDDEN, NULL);
171 if (!strcmp(in, "/cgitest")) {
172 static char *cmd[] = {
175 INSTALL_DATADIR"/libwebsockets-test-server/lws-cgi-test.sh",
179 lwsl_notice("%s: cgitest\n", __func__);
180 n = lws_cgi(wsi, cmd, 5);
182 lwsl_err("%s: cgi failed\n");
185 p = buffer + LWS_PRE;
186 end = p + sizeof(buffer) - LWS_PRE;
188 if (lws_add_http_header_status(wsi, 200, &p, end))
190 if (lws_add_http_header_by_token(wsi,
191 WSI_TOKEN_HTTP_CONTENT_TYPE,
192 (unsigned char *)"text/plain",
195 if (lws_add_http_header_by_token(wsi, WSI_TOKEN_CONNECTION,
196 (unsigned char *)"close", 5, &p, end))
198 if (lws_finalize_http_header(wsi, &p, end))
200 n = lws_write(wsi, buffer + LWS_PRE,
201 p - (buffer + LWS_PRE),
202 LWS_WRITE_HTTP_HEADERS);
207 /* if a legal POST URL, let it continue and accept data */
208 if (lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI))
211 /* check for the "send a big file by hand" example case */
213 if (!strcmp((const char *)in, "/leaf.jpg")) {
214 if (strlen(resource_path) > sizeof(leaf_path) - 10)
216 sprintf(leaf_path, "%s/leaf.jpg", resource_path);
218 /* well, let's demonstrate how to send the hard way */
220 p = buffer + LWS_PRE;
221 end = p + sizeof(buffer) - LWS_PRE;
223 pss->fd = lws_plat_file_open(wsi, leaf_path, &file_len,
226 if (pss->fd == LWS_INVALID_FILE) {
227 lwsl_err("faild to open file %s\n", leaf_path);
232 * we will send a big jpeg file, but it could be
233 * anything. Set the Content-Type: appropriately
234 * so the browser knows what to do with it.
236 * Notice we use the APIs to build the header, which
237 * will do the right thing for HTTP 1/1.1 and HTTP2
238 * depending on what connection it happens to be working
241 if (lws_add_http_header_status(wsi, 200, &p, end))
243 if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_SERVER,
244 (unsigned char *)"libwebsockets",
247 if (lws_add_http_header_by_token(wsi,
248 WSI_TOKEN_HTTP_CONTENT_TYPE,
249 (unsigned char *)"image/jpeg",
252 if (lws_add_http_header_content_length(wsi,
256 if (lws_finalize_http_header(wsi, &p, end))
260 * send the http headers...
261 * this won't block since it's the first payload sent
262 * on the connection since it was established
263 * (too small for partial)
265 * Notice they are sent using LWS_WRITE_HTTP_HEADERS
266 * which also means you can't send body too in one step,
267 * this is mandated by changes in HTTP2
271 lwsl_info("%s\n", buffer + LWS_PRE);
273 n = lws_write(wsi, buffer + LWS_PRE,
274 p - (buffer + LWS_PRE),
275 LWS_WRITE_HTTP_HEADERS);
277 lws_plat_file_close(wsi, pss->fd);
281 * book us a LWS_CALLBACK_HTTP_WRITEABLE callback
283 lws_callback_on_writable(wsi);
287 /* if not, send a file the easy way */
288 strcpy(buf, resource_path);
289 if (strcmp(in, "/")) {
290 if (*((const char *)in) != '/')
292 strncat(buf, in, sizeof(buf) - strlen(resource_path));
293 } else /* default file to serve */
294 strcat(buf, "/test.html");
295 buf[sizeof(buf) - 1] = '\0';
297 /* refuse to serve files we don't understand */
298 mimetype = get_mimetype(buf);
300 lwsl_err("Unknown mimetype for %s\n", buf);
301 lws_return_http_status(wsi,
302 HTTP_STATUS_UNSUPPORTED_MEDIA_TYPE, NULL);
306 /* demonstrates how to set a cookie on / */
308 other_headers = leaf_path;
309 p = (unsigned char *)leaf_path;
310 if (!strcmp((const char *)in, "/") &&
311 !lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_COOKIE)) {
312 /* this isn't very unguessable but it'll do for us */
313 gettimeofday(&tv, NULL);
314 n = sprintf(b64, "test=LWS_%u_%u_COOKIE;Max-Age=360000",
315 (unsigned int)tv.tv_sec,
316 (unsigned int)tv.tv_usec);
318 if (lws_add_http_header_by_name(wsi,
319 (unsigned char *)"set-cookie:",
320 (unsigned char *)b64, n, &p,
321 (unsigned char *)leaf_path + sizeof(leaf_path)))
324 if (lws_is_ssl(wsi) && lws_add_http_header_by_name(wsi,
326 "Strict-Transport-Security:",
328 "max-age=15768000 ; "
329 "includeSubDomains", 36, &p,
330 (unsigned char *)leaf_path +
333 n = (char *)p - leaf_path;
335 n = lws_serve_http_file(wsi, buf, mimetype, other_headers, n);
336 if (n < 0 || ((n > 0) && lws_http_transaction_completed(wsi)))
337 return -1; /* error or can't reuse connection: close the socket */
340 * notice that the sending of the file completes asynchronously,
341 * we'll get a LWS_CALLBACK_HTTP_FILE_COMPLETION callback when
346 case LWS_CALLBACK_HTTP_BODY:
347 strncpy(buf, in, 20);
352 lwsl_notice("LWS_CALLBACK_HTTP_BODY: %s... len %d\n",
353 (const char *)buf, (int)len);
357 case LWS_CALLBACK_HTTP_BODY_COMPLETION:
358 lwsl_notice("LWS_CALLBACK_HTTP_BODY_COMPLETION\n");
359 /* the whole of the sent body arrived, close or reuse the connection */
360 lws_return_http_status(wsi, HTTP_STATUS_OK, NULL);
363 case LWS_CALLBACK_HTTP_FILE_COMPLETION:
366 case LWS_CALLBACK_HTTP_WRITEABLE:
367 lwsl_info("LWS_CALLBACK_HTTP_WRITEABLE\n");
369 if (pss->fd == LWS_INVALID_FILE)
372 if (pss->reason_bf) {
373 lwsl_debug("%s: stdout\n", __func__);
374 n = read(lws_get_socket_fd(pss->args.stdwsi[LWS_STDOUT]),
375 buf + LWS_PRE, sizeof(buf) - LWS_PRE);
376 //lwsl_notice("read %d (errno %d)\n", n, errno);
377 if (n < 0 && errno != EAGAIN)
380 m = lws_write(wsi, (unsigned char *)buf + LWS_PRE, n,
382 //lwsl_notice("write %d\n", m);
391 * we can send more of whatever it is we were sending
395 /* we'd like the send this much */
396 n = sizeof(buffer) - LWS_PRE;
398 /* but if the peer told us he wants less, we can adapt */
399 m = lws_get_peer_write_allowance(wsi);
401 /* -1 means not using a protocol that has this info */
403 /* right now, peer can't handle anything */
406 if (m != -1 && m < n)
407 /* he couldn't handle that much */
410 n = lws_plat_file_read(wsi, pss->fd,
411 &amount, buffer + LWS_PRE, n);
412 /* problem reading, close conn */
414 lwsl_err("problem reading file\n");
418 /* sent it all, close conn */
422 * To support HTTP2, must take care about preamble space
424 * identification of when we send the last payload frame
425 * is handled by the library itself if you sent a
426 * content-length header
428 m = lws_write(wsi, buffer + LWS_PRE, n, LWS_WRITE_HTTP);
430 lwsl_err("write failed\n");
431 /* write failed, close conn */
434 if (m) /* while still active, extend timeout */
435 lws_set_timeout(wsi, PENDING_TIMEOUT_HTTP_CONTENT, 5);
438 } while (!lws_send_pipe_choked(wsi) && (sent < 1024 * 1024));
440 lws_callback_on_writable(wsi);
443 lws_plat_file_close(wsi, pss->fd);
444 pss->fd = LWS_INVALID_FILE;
448 lws_plat_file_close(wsi, pss->fd);
453 * callback for confirming to continue with client IP appear in
454 * protocol 0 callback since no websocket protocol has been agreed
455 * yet. You can just ignore this if you won't filter on client IP
456 * since the default uhandled callback return is 0 meaning let the
457 * connection continue.
459 case LWS_CALLBACK_FILTER_NETWORK_CONNECTION:
460 /* if we returned non-zero from here, we kill the connection */
464 /* CGI IO events (POLLIN/OUT) appear here our demo user code policy is
466 * - POST data goes on subprocess stdin
467 * - subprocess stdout goes on http via writeable callback
468 * - subprocess stderr goes to the logs
470 case LWS_CALLBACK_CGI:
471 pss->args = *((struct lws_cgi_args *)in);
472 //lwsl_notice("LWS_CALLBACK_CGI: ch %d\n", pss->args.ch);
473 switch (pss->args.ch) { /* which of stdin/out/err ? */
475 /* TBD stdin rx flow control */
478 pss->reason_bf |= 1 << pss->args.ch;
479 /* when writing to MASTER would not block */
480 lws_callback_on_writable(wsi);
483 n = read(lws_get_socket_fd(pss->args.stdwsi[LWS_STDERR]),
485 //lwsl_notice("stderr reads %d\n", n);
487 if (buf[n - 1] != '\n')
490 lwsl_notice("CGI-stderr: %s\n", buf);
496 case LWS_CALLBACK_CGI_TERMINATED:
497 lwsl_notice("LWS_CALLBACK_CGI_TERMINATED\n");
498 /* because we sent on openended http, close the connection */
501 case LWS_CALLBACK_CGI_STDIN_DATA: /* POST body for stdin */
502 lwsl_notice("LWS_CALLBACK_CGI_STDIN_DATA\n");
503 pss->args = *((struct lws_cgi_args *)in);
504 n = write(lws_get_socket_fd(pss->args.stdwsi[LWS_STDIN]),
505 pss->args.data, pss->args.len);
506 lwsl_notice("LWS_CALLBACK_CGI_STDIN_DATA: write says %d", n);
507 if (n < pss->args.len)
508 lwsl_notice("LWS_CALLBACK_CGI_STDIN_DATA: sent %d only %d went",
514 * callbacks for managing the external poll() array appear in
515 * protocol 0 callback
518 case LWS_CALLBACK_LOCK_POLL:
520 * lock mutex to protect pollfd state
521 * called before any other POLL related callback
522 * if protecting wsi lifecycle change, len == 1
524 test_server_lock(len);
527 case LWS_CALLBACK_UNLOCK_POLL:
529 * unlock mutex to protect pollfd state when
530 * called after any other POLL related callback
531 * if protecting wsi lifecycle change, len == 1
533 test_server_unlock(len);
537 case LWS_CALLBACK_ADD_POLL_FD:
539 if (count_pollfds >= max_poll_elements) {
540 lwsl_err("LWS_CALLBACK_ADD_POLL_FD: too many sockets to track\n");
544 fd_lookup[pa->fd] = count_pollfds;
545 pollfds[count_pollfds].fd = pa->fd;
546 pollfds[count_pollfds].events = pa->events;
547 pollfds[count_pollfds++].revents = 0;
550 case LWS_CALLBACK_DEL_POLL_FD:
551 if (!--count_pollfds)
553 m = fd_lookup[pa->fd];
554 /* have the last guy take up the vacant slot */
555 pollfds[m] = pollfds[count_pollfds];
556 fd_lookup[pollfds[count_pollfds].fd] = m;
559 case LWS_CALLBACK_CHANGE_MODE_POLL_FD:
560 pollfds[fd_lookup[pa->fd]].events = pa->events;
564 case LWS_CALLBACK_GET_THREAD_ID:
566 * if you will call "lws_callback_on_writable"
567 * from a different thread, return the caller thread ID
568 * here so lws can use this information to work out if it
569 * should signal the poll() loop to exit and restart early
572 /* return pthread_getthreadid_np(); */
582 /* if we're on HTTP1.1 or 2.0, will keep the idle connection alive */
584 if (lws_http_transaction_completed(wsi))