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);
29 struct config conf = {};
31 const char * const http_versions[] = {
32 [UH_HTTP_VER_0_9] = "HTTP/0.9",
33 [UH_HTTP_VER_1_0] = "HTTP/1.0",
34 [UH_HTTP_VER_1_1] = "HTTP/1.1",
37 const char * const http_methods[] = {
38 [UH_HTTP_MSG_GET] = "GET",
39 [UH_HTTP_MSG_POST] = "POST",
40 [UH_HTTP_MSG_HEAD] = "HEAD",
43 void uh_http_header(struct client *cl, int code, const char *summary)
45 struct http_request *r = &cl->request;
46 const char *enc = "Transfer-Encoding: chunked\r\n";
49 if (!uh_use_chunked(cl))
52 if (r->connection_close)
53 conn = "Connection: close";
55 conn = "Connection: Keep-Alive";
57 ustream_printf(cl->us, "%s %03i %s\r\n%s\r\n%s",
58 http_versions[cl->request.version],
59 code, summary, conn, enc);
61 if (!r->connection_close)
62 ustream_printf(cl->us, "Keep-Alive: timeout=%d\r\n", conf.http_keepalive);
65 static void uh_connection_close(struct client *cl)
67 cl->state = CLIENT_STATE_CLOSE;
69 ustream_state_change(cl->us);
72 static void uh_dispatch_done(struct client *cl)
74 if (cl->dispatch.free)
75 cl->dispatch.free(cl);
76 if (cl->dispatch.req_free)
77 cl->dispatch.req_free(cl);
80 static void client_timeout(struct uloop_timeout *timeout)
82 struct client *cl = container_of(timeout, struct client, timeout);
84 cl->state = CLIENT_STATE_CLOSE;
85 uh_connection_close(cl);
88 static void uh_set_client_timeout(struct client *cl, int timeout)
90 cl->timeout.cb = client_timeout;
91 uloop_timeout_set(&cl->timeout, timeout * 1000);
94 static void uh_keepalive_poll_cb(struct uloop_timeout *timeout)
96 struct client *cl = container_of(timeout, struct client, timeout);
97 int sec = cl->requests > 0 ? conf.http_keepalive : conf.network_timeout;
99 uh_set_client_timeout(cl, sec);
100 cl->us->notify_read(cl->us, 0);
103 static void uh_poll_connection(struct client *cl)
105 cl->timeout.cb = uh_keepalive_poll_cb;
106 uloop_timeout_set(&cl->timeout, 1);
109 void uh_request_done(struct client *cl)
112 uh_dispatch_done(cl);
113 memset(&cl->dispatch, 0, sizeof(cl->dispatch));
115 if (!conf.http_keepalive || cl->request.connection_close)
116 return uh_connection_close(cl);
118 cl->state = CLIENT_STATE_INIT;
120 uh_poll_connection(cl);
124 uh_client_error(struct client *cl, int code, const char *summary, const char *fmt, ...)
128 uh_http_header(cl, code, summary);
129 ustream_printf(cl->us, "Content-Type: text/html\r\n\r\n");
131 uh_chunk_printf(cl, "<h1>%s</h1>", summary);
135 uh_chunk_vprintf(cl, fmt, arg);
142 static void uh_header_error(struct client *cl, int code, const char *summary)
144 uh_client_error(cl, code, summary, NULL);
145 uh_connection_close(cl);
148 static int find_idx(const char * const *list, int max, const char *str)
152 for (i = 0; i < max; i++)
153 if (!strcmp(list[i], str))
159 static int client_parse_request(struct client *cl, char *data)
161 struct http_request *req = &cl->request;
162 char *type, *path, *version;
163 int h_method, h_version;
165 type = strtok(data, " ");
166 path = strtok(NULL, " ");
167 version = strtok(NULL, " ");
168 if (!type || !path || !version)
169 return CLIENT_STATE_DONE;
171 blobmsg_add_string(&cl->hdr, "URL", path);
173 memset(&cl->request, 0, sizeof(cl->request));
174 h_method = find_idx(http_methods, ARRAY_SIZE(http_methods), type);
175 h_version = find_idx(http_versions, ARRAY_SIZE(http_versions), version);
176 if (h_method < 0 || h_version < 0) {
177 req->version = UH_HTTP_VER_1_0;
178 return CLIENT_STATE_DONE;
181 req->method = h_method;
182 req->version = h_version;
183 if (req->version < UH_HTTP_VER_1_1 || !conf.http_keepalive)
184 req->connection_close = true;
186 return CLIENT_STATE_HEADER;
189 static bool client_init_cb(struct client *cl, char *buf, int len)
193 newline = strstr(buf, "\r\n");
201 blob_buf_init(&cl->hdr, 0);
202 cl->state = client_parse_request(cl, buf);
203 ustream_consume(cl->us, newline + 2 - buf);
204 if (cl->state == CLIENT_STATE_DONE)
205 uh_header_error(cl, 400, "Bad Request");
210 static bool rfc1918_filter_check(struct client *cl)
212 if (!conf.rfc1918_filter)
215 if (!uh_addr_rfc1918(&cl->peer_addr) || uh_addr_rfc1918(&cl->srv_addr))
218 uh_client_error(cl, 403, "Forbidden",
219 "Rejected request from RFC1918 IP "
220 "to public server address");
224 static void client_header_complete(struct client *cl)
226 struct http_request *r = &cl->request;
228 if (!rfc1918_filter_check(cl))
232 ustream_printf(cl->us, "HTTP/1.1 100 Continue\r\n\r\n");
236 if (r->method != UH_HTTP_MSG_POST)
241 r->connection_close = true;
247 uh_handle_request(cl);
250 static void client_parse_header(struct client *cl, char *data)
252 struct http_request *r = &cl->request;
258 uloop_timeout_cancel(&cl->timeout);
259 cl->state = CLIENT_STATE_DATA;
260 client_header_complete(cl);
264 val = uh_split_header(data);
266 cl->state = CLIENT_STATE_DONE;
270 for (name = data; *name; name++)
272 *name = tolower(*name);
274 if (!strcmp(data, "expect")) {
275 if (!strcasecmp(val, "100-continue"))
276 r->expect_cont = true;
278 uh_header_error(cl, 412, "Precondition Failed");
281 } else if (!strcmp(data, "content-length")) {
282 r->content_length = strtoul(val, &err, 0);
284 uh_header_error(cl, 400, "Bad Request");
287 } else if (!strcmp(data, "transfer-encoding")) {
288 if (!strcmp(val, "chunked"))
289 r->transfer_chunked = true;
290 } else if (!strcmp(data, "connection")) {
291 if (!strcasecmp(val, "close"))
292 r->connection_close = true;
293 else if (!strcasecmp(val, "keep-alive"))
294 r->connection_close = false;
295 } else if (!strcmp(data, "user-agent")) {
298 if (strstr(val, "Opera"))
300 else if ((str = strstr(val, "MSIE ")) != NULL) {
301 r->ua = UH_UA_MSIE_NEW;
302 if (str[5] && str[6] == '.') {
305 if (strstr(str, "SV1"))
310 r->ua = UH_UA_MSIE_OLD;
314 } else if (strstr(val, "Safari/") && strstr(val, "Mac OS X"))
315 r->ua = UH_UA_SAFARI;
316 else if (strstr(val, "Chrome/"))
317 r->ua = UH_UA_CHROME;
318 else if (strstr(val, "Gecko/"))
320 else if (strstr(val, "Konqueror"))
321 r->ua = UH_UA_KONQUEROR;
325 blobmsg_add_string(&cl->hdr, data, val);
327 cl->state = CLIENT_STATE_HEADER;
330 void client_poll_post_data(struct client *cl)
332 struct dispatch *d = &cl->dispatch;
333 struct http_request *r = &cl->request;
337 if (cl->state == CLIENT_STATE_DONE)
345 buf = ustream_get_read_buf(cl->us, &len);
352 cur_len = min(r->content_length, len);
358 cur_len = d->data_send(cl, buf, cur_len);
360 r->content_length -= cur_len;
361 ustream_consume(cl->us, cur_len);
365 if (!r->transfer_chunked)
368 if (r->transfer_chunked > 1)
371 sep = strstr(buf + offset, "\r\n");
377 r->content_length = strtoul(buf + offset, &sep, 16);
378 r->transfer_chunked++;
379 ustream_consume(cl->us, sep + 2 - buf);
381 /* invalid chunk length */
383 r->content_length = 0;
384 r->transfer_chunked = 0;
388 /* empty chunk == eof */
389 if (!r->content_length) {
390 r->transfer_chunked = false;
395 buf = ustream_get_read_buf(cl->us, &len);
396 if (!r->content_length && !r->transfer_chunked &&
397 cl->state != CLIENT_STATE_DONE) {
398 if (cl->dispatch.data_done)
399 cl->dispatch.data_done(cl);
401 cl->state = CLIENT_STATE_DONE;
405 static bool client_data_cb(struct client *cl, char *buf, int len)
407 client_poll_post_data(cl);
411 static bool client_header_cb(struct client *cl, char *buf, int len)
416 newline = strstr(buf, "\r\n");
421 client_parse_header(cl, buf);
422 line_len = newline + 2 - buf;
423 ustream_consume(cl->us, line_len);
424 if (cl->state == CLIENT_STATE_DATA)
425 return client_data_cb(cl, newline + 2, len - line_len);
430 typedef bool (*read_cb_t)(struct client *cl, char *buf, int len);
431 static read_cb_t read_cbs[] = {
432 [CLIENT_STATE_INIT] = client_init_cb,
433 [CLIENT_STATE_HEADER] = client_header_cb,
434 [CLIENT_STATE_DATA] = client_data_cb,
437 void uh_client_read_cb(struct client *cl)
439 struct ustream *us = cl->us;
444 str = ustream_get_read_buf(us, &len);
448 if (cl->state >= array_size(read_cbs) || !read_cbs[cl->state])
451 if (!read_cbs[cl->state](cl, str, len)) {
452 if (len == us->r.buffer_len &&
453 cl->state != CLIENT_STATE_DATA)
454 uh_header_error(cl, 413, "Request Entity Too Large");
460 static void client_close(struct client *cl)
463 uh_dispatch_done(cl);
464 uloop_timeout_cancel(&cl->timeout);
466 uh_tls_client_detach(cl);
467 ustream_free(&cl->sfd.stream);
468 close(cl->sfd.fd.fd);
470 blob_buf_free(&cl->hdr);
473 uh_unblock_listeners();
476 void uh_client_notify_state(struct client *cl)
478 struct ustream *s = cl->us;
480 if (!s->write_error) {
481 if (cl->state == CLIENT_STATE_DATA)
484 if (!s->eof || s->w.data_bytes)
488 return client_close(cl);
491 static void client_ustream_read_cb(struct ustream *s, int bytes)
493 struct client *cl = container_of(s, struct client, sfd.stream);
495 uh_client_read_cb(cl);
498 static void client_ustream_write_cb(struct ustream *s, int bytes)
500 struct client *cl = container_of(s, struct client, sfd.stream);
502 if (cl->dispatch.write_cb)
503 cl->dispatch.write_cb(cl);
506 static void client_notify_state(struct ustream *s)
508 struct client *cl = container_of(s, struct client, sfd.stream);
510 uh_client_notify_state(cl);
513 static void set_addr(struct uh_addr *addr, void *src)
515 struct sockaddr_in *sin = src;
516 struct sockaddr_in6 *sin6 = src;
518 addr->family = sin->sin_family;
519 if (addr->family == AF_INET) {
520 addr->port = ntohs(sin->sin_port);
521 memcpy(&addr->in, &sin->sin_addr, sizeof(addr->in));
523 addr->port = ntohs(sin6->sin6_port);
524 memcpy(&addr->in6, &sin6->sin6_addr, sizeof(addr->in6));
528 bool uh_accept_client(int fd, bool tls)
530 static struct client *next_client;
534 static int client_id = 0;
535 struct sockaddr_in6 addr;
538 next_client = calloc(1, sizeof(*next_client));
543 sfd = accept(fd, (struct sockaddr *) &addr, &sl);
547 set_addr(&cl->peer_addr, &addr);
549 getsockname(sfd, (struct sockaddr *) &addr, &sl);
550 set_addr(&cl->srv_addr, &addr);
552 cl->us = &cl->sfd.stream;
554 uh_tls_client_attach(cl);
556 cl->us->notify_read = client_ustream_read_cb;
557 cl->us->notify_write = client_ustream_write_cb;
558 cl->us->notify_state = client_notify_state;
561 cl->us->string_data = true;
562 ustream_fd_init(&cl->sfd, sfd);
564 uh_poll_connection(cl);
565 list_add_tail(&cl->list, &clients);
569 cl->id = client_id++;
574 void uh_close_fds(void)
579 uh_close_listen_fds();
580 list_for_each_entry(cl, &clients, list) {
581 close(cl->sfd.fd.fd);
582 if (cl->dispatch.close_fds)
583 cl->dispatch.close_fds(cl);