2 * uhttpd - Tiny single-threaded httpd
4 * Copyright (C) 2010-2013 Jo-Philipp Wich <xm@subsignal.org>
5 * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
7 * Permission to use, copy, modify, and/or distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 #include <libubox/blobmsg.h>
26 static LIST_HEAD(clients);
27 static bool client_done = false;
30 struct config conf = {};
32 const char * const http_versions[] = {
33 [UH_HTTP_VER_0_9] = "HTTP/0.9",
34 [UH_HTTP_VER_1_0] = "HTTP/1.0",
35 [UH_HTTP_VER_1_1] = "HTTP/1.1",
38 const char * const http_methods[] = {
39 [UH_HTTP_MSG_GET] = "GET",
40 [UH_HTTP_MSG_POST] = "POST",
41 [UH_HTTP_MSG_HEAD] = "HEAD",
42 [UH_HTTP_MSG_OPTIONS] = "OPTIONS",
45 void uh_http_header(struct client *cl, int code, const char *summary)
47 struct http_request *r = &cl->request;
48 struct blob_attr *cur;
49 const char *enc = "Transfer-Encoding: chunked\r\n";
55 if (!uh_use_chunked(cl))
58 if (r->connection_close)
59 conn = "Connection: close";
61 conn = "Connection: Keep-Alive";
63 ustream_printf(cl->us, "%s %03i %s\r\n%s\r\n%s",
64 http_versions[cl->request.version],
65 code, summary, conn, enc);
67 if (!r->connection_close)
68 ustream_printf(cl->us, "Keep-Alive: timeout=%d\r\n", conf.http_keepalive);
70 blobmsg_for_each_attr(cur, cl->hdr_response.head, rem)
71 ustream_printf(cl->us, "%s: %s\r\n", blobmsg_name(cur),
72 blobmsg_get_string(cur));
75 static void uh_connection_close(struct client *cl)
77 cl->state = CLIENT_STATE_CLOSE;
79 ustream_state_change(cl->us);
82 static void uh_dispatch_done(struct client *cl)
84 if (cl->dispatch.free)
85 cl->dispatch.free(cl);
86 if (cl->dispatch.req_free)
87 cl->dispatch.req_free(cl);
90 static void client_timeout(struct uloop_timeout *timeout)
92 struct client *cl = container_of(timeout, struct client, timeout);
94 cl->state = CLIENT_STATE_CLOSE;
95 uh_connection_close(cl);
98 static void uh_set_client_timeout(struct client *cl, int timeout)
100 cl->timeout.cb = client_timeout;
101 uloop_timeout_set(&cl->timeout, timeout * 1000);
104 static void uh_keepalive_poll_cb(struct uloop_timeout *timeout)
106 struct client *cl = container_of(timeout, struct client, timeout);
107 int sec = cl->requests > 0 ? conf.http_keepalive : conf.network_timeout;
109 uh_set_client_timeout(cl, sec);
110 cl->us->notify_read(cl->us, 0);
113 static void uh_poll_connection(struct client *cl)
115 cl->timeout.cb = uh_keepalive_poll_cb;
116 uloop_timeout_set(&cl->timeout, 1);
119 void uh_request_done(struct client *cl)
122 uh_dispatch_done(cl);
123 blob_buf_init(&cl->hdr_response, 0);
124 memset(&cl->dispatch, 0, sizeof(cl->dispatch));
126 if (!conf.http_keepalive || cl->request.connection_close)
127 return uh_connection_close(cl);
129 cl->state = CLIENT_STATE_INIT;
131 uh_poll_connection(cl);
135 uh_client_error(struct client *cl, int code, const char *summary, const char *fmt, ...)
139 uh_http_header(cl, code, summary);
140 ustream_printf(cl->us, "Content-Type: text/html\r\n\r\n");
142 uh_chunk_printf(cl, "<h1>%s</h1>", summary);
146 uh_chunk_vprintf(cl, fmt, arg);
153 static void uh_header_error(struct client *cl, int code, const char *summary)
155 uh_client_error(cl, code, summary, NULL);
156 uh_connection_close(cl);
159 static int find_idx(const char * const *list, int max, const char *str)
163 for (i = 0; i < max; i++)
164 if (!strcmp(list[i], str))
170 static int client_parse_request(struct client *cl, char *data)
172 struct http_request *req = &cl->request;
173 char *type, *path, *version;
174 int h_method, h_version;
176 type = strtok(data, " ");
177 path = strtok(NULL, " ");
178 version = strtok(NULL, " ");
179 if (!type || !path || !version)
180 return CLIENT_STATE_DONE;
182 blobmsg_add_string(&cl->hdr, "URL", path);
184 memset(&cl->request, 0, sizeof(cl->request));
185 h_method = find_idx(http_methods, ARRAY_SIZE(http_methods), type);
186 h_version = find_idx(http_versions, ARRAY_SIZE(http_versions), version);
187 if (h_method < 0 || h_version < 0) {
188 req->version = UH_HTTP_VER_1_0;
189 return CLIENT_STATE_DONE;
192 req->method = h_method;
193 req->version = h_version;
194 if (req->version < UH_HTTP_VER_1_1 || req->method == UH_HTTP_MSG_POST ||
195 !conf.http_keepalive)
196 req->connection_close = true;
198 return CLIENT_STATE_HEADER;
201 static bool client_init_cb(struct client *cl, char *buf, int len)
205 newline = strstr(buf, "\r\n");
209 if (newline == buf) {
210 ustream_consume(cl->us, 2);
215 blob_buf_init(&cl->hdr, 0);
216 cl->state = client_parse_request(cl, buf);
217 ustream_consume(cl->us, newline + 2 - buf);
218 if (cl->state == CLIENT_STATE_DONE)
219 uh_header_error(cl, 400, "Bad Request");
224 static bool rfc1918_filter_check(struct client *cl)
226 if (!conf.rfc1918_filter)
229 if (!uh_addr_rfc1918(&cl->peer_addr) || uh_addr_rfc1918(&cl->srv_addr))
232 uh_client_error(cl, 403, "Forbidden",
233 "Rejected request from RFC1918 IP "
234 "to public server address");
238 static bool tls_redirect_check(struct client *cl)
241 struct blob_attr *cur;
242 char *ptr, *url = NULL, *host = NULL;
244 if (cl->tls || !conf.tls_redirect)
247 if ((port = uh_first_tls_port(cl->srv_addr.family)) == -1)
250 blob_for_each_attr(cur, cl->hdr.head, rem) {
251 if (!strcmp(blobmsg_name(cur), "host"))
252 host = blobmsg_get_string(cur);
254 if (!strcmp(blobmsg_name(cur), "URL"))
255 url = blobmsg_get_string(cur);
264 if ((ptr = strchr(host, ']')) != NULL)
266 else if ((ptr = strchr(host, ':')) != NULL)
269 cl->request.disable_chunked = true;
270 cl->request.connection_close = true;
272 uh_http_header(cl, 307, "Temporary Redirect");
275 ustream_printf(cl->us, "Location: https://%s:%d%s\r\n\r\n", host, port, url);
277 ustream_printf(cl->us, "Location: https://%s%s\r\n\r\n", host, url);
284 static void client_header_complete(struct client *cl)
286 struct http_request *r = &cl->request;
288 if (!rfc1918_filter_check(cl))
291 if (!tls_redirect_check(cl))
295 ustream_printf(cl->us, "HTTP/1.1 100 Continue\r\n\r\n");
299 if (r->method != UH_HTTP_MSG_POST)
304 r->connection_close = true;
310 uh_handle_request(cl);
313 static void client_parse_header(struct client *cl, char *data)
315 struct http_request *r = &cl->request;
321 uloop_timeout_cancel(&cl->timeout);
322 cl->state = CLIENT_STATE_DATA;
323 client_header_complete(cl);
327 val = uh_split_header(data);
329 cl->state = CLIENT_STATE_DONE;
333 for (name = data; *name; name++)
335 *name = tolower(*name);
337 if (!strcmp(data, "expect")) {
338 if (!strcasecmp(val, "100-continue"))
339 r->expect_cont = true;
341 uh_header_error(cl, 412, "Precondition Failed");
344 } else if (!strcmp(data, "content-length")) {
345 r->content_length = strtoul(val, &err, 0);
347 uh_header_error(cl, 400, "Bad Request");
350 } else if (!strcmp(data, "transfer-encoding")) {
351 if (!strcmp(val, "chunked"))
352 r->transfer_chunked = true;
353 } else if (!strcmp(data, "connection")) {
354 if (!strcasecmp(val, "close"))
355 r->connection_close = true;
356 } else if (!strcmp(data, "user-agent")) {
359 if (strstr(val, "Opera"))
361 else if ((str = strstr(val, "MSIE ")) != NULL) {
362 r->ua = UH_UA_MSIE_NEW;
363 if (str[5] && str[6] == '.') {
366 if (strstr(str, "SV1"))
371 r->ua = UH_UA_MSIE_OLD;
376 else if (strstr(val, "Chrome/"))
377 r->ua = UH_UA_CHROME;
378 else if (strstr(val, "Safari/") && strstr(val, "Mac OS X"))
379 r->ua = UH_UA_SAFARI;
380 else if (strstr(val, "Gecko/"))
382 else if (strstr(val, "Konqueror"))
383 r->ua = UH_UA_KONQUEROR;
387 blobmsg_add_string(&cl->hdr, data, val);
389 cl->state = CLIENT_STATE_HEADER;
392 void client_poll_post_data(struct client *cl)
394 struct dispatch *d = &cl->dispatch;
395 struct http_request *r = &cl->request;
399 if (cl->state == CLIENT_STATE_DONE)
407 buf = ustream_get_read_buf(cl->us, &len);
414 cur_len = min(r->content_length, len);
420 cur_len = d->data_send(cl, buf, cur_len);
422 r->content_length -= cur_len;
423 ustream_consume(cl->us, cur_len);
427 if (!r->transfer_chunked)
430 if (r->transfer_chunked > 1)
433 sep = strstr(buf + offset, "\r\n");
439 r->content_length = strtoul(buf + offset, &sep, 16);
440 r->transfer_chunked++;
441 ustream_consume(cl->us, sep + 2 - buf);
443 /* invalid chunk length */
445 r->content_length = 0;
446 r->transfer_chunked = 0;
450 /* empty chunk == eof */
451 if (!r->content_length) {
452 r->transfer_chunked = false;
457 buf = ustream_get_read_buf(cl->us, &len);
458 if (!r->content_length && !r->transfer_chunked &&
459 cl->state != CLIENT_STATE_DONE) {
460 if (cl->dispatch.data_done)
461 cl->dispatch.data_done(cl);
463 cl->state = CLIENT_STATE_DONE;
467 static bool client_data_cb(struct client *cl, char *buf, int len)
469 client_poll_post_data(cl);
473 static bool client_header_cb(struct client *cl, char *buf, int len)
478 newline = strstr(buf, "\r\n");
483 client_parse_header(cl, buf);
484 line_len = newline + 2 - buf;
485 ustream_consume(cl->us, line_len);
486 if (cl->state == CLIENT_STATE_DATA)
487 return client_data_cb(cl, newline + 2, len - line_len);
492 typedef bool (*read_cb_t)(struct client *cl, char *buf, int len);
493 static read_cb_t read_cbs[] = {
494 [CLIENT_STATE_INIT] = client_init_cb,
495 [CLIENT_STATE_HEADER] = client_header_cb,
496 [CLIENT_STATE_DATA] = client_data_cb,
499 void uh_client_read_cb(struct client *cl)
501 struct ustream *us = cl->us;
507 str = ustream_get_read_buf(us, &len);
511 if (cl->state >= array_size(read_cbs) || !read_cbs[cl->state])
514 if (!read_cbs[cl->state](cl, str, len)) {
515 if (len == us->r.buffer_len &&
516 cl->state != CLIENT_STATE_DATA)
517 uh_header_error(cl, 413, "Request Entity Too Large");
520 } while (!client_done);
523 static void client_close(struct client *cl)
526 cl->state = CLIENT_STATE_CLEANUP;
532 uh_dispatch_done(cl);
533 uloop_timeout_cancel(&cl->timeout);
535 uh_tls_client_detach(cl);
536 ustream_free(&cl->sfd.stream);
537 close(cl->sfd.fd.fd);
539 blob_buf_free(&cl->hdr);
540 blob_buf_free(&cl->hdr_response);
543 uh_unblock_listeners();
546 void uh_client_notify_state(struct client *cl)
548 struct ustream *s = cl->us;
550 if (!s->write_error && cl->state != CLIENT_STATE_CLEANUP) {
551 if (cl->state == CLIENT_STATE_DATA)
554 if (!s->eof || s->w.data_bytes)
558 return client_close(cl);
561 static void client_ustream_read_cb(struct ustream *s, int bytes)
563 struct client *cl = container_of(s, struct client, sfd.stream);
565 uh_client_read_cb(cl);
568 static void client_ustream_write_cb(struct ustream *s, int bytes)
570 struct client *cl = container_of(s, struct client, sfd.stream);
572 if (cl->dispatch.write_cb)
573 cl->dispatch.write_cb(cl);
576 static void client_notify_state(struct ustream *s)
578 struct client *cl = container_of(s, struct client, sfd.stream);
580 uh_client_notify_state(cl);
583 static void set_addr(struct uh_addr *addr, void *src)
585 struct sockaddr_in *sin = src;
586 struct sockaddr_in6 *sin6 = src;
588 addr->family = sin->sin_family;
589 if (addr->family == AF_INET) {
590 addr->port = ntohs(sin->sin_port);
591 memcpy(&addr->in, &sin->sin_addr, sizeof(addr->in));
593 addr->port = ntohs(sin6->sin6_port);
594 memcpy(&addr->in6, &sin6->sin6_addr, sizeof(addr->in6));
598 bool uh_accept_client(int fd, bool tls)
600 static struct client *next_client;
604 static int client_id = 0;
605 struct sockaddr_in6 addr;
608 next_client = calloc(1, sizeof(*next_client));
613 sfd = accept(fd, (struct sockaddr *) &addr, &sl);
617 set_addr(&cl->peer_addr, &addr);
619 getsockname(sfd, (struct sockaddr *) &addr, &sl);
620 set_addr(&cl->srv_addr, &addr);
622 cl->us = &cl->sfd.stream;
624 uh_tls_client_attach(cl);
626 cl->us->notify_read = client_ustream_read_cb;
627 cl->us->notify_write = client_ustream_write_cb;
628 cl->us->notify_state = client_notify_state;
631 cl->us->string_data = true;
632 ustream_fd_init(&cl->sfd, sfd);
634 uh_poll_connection(cl);
635 list_add_tail(&cl->list, &clients);
639 cl->id = client_id++;
645 void uh_close_fds(void)
650 uh_close_listen_fds();
651 list_for_each_entry(cl, &clients, list) {
652 close(cl->sfd.fd.fd);
653 if (cl->dispatch.close_fds)
654 cl->dispatch.close_fds(cl);