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 const char *enc = "Transfer-Encoding: chunked\r\n";
53 if (!cl->request.respond_chunked)
56 if (r->connection_close)
57 conn = "Connection: close";
59 conn = "Connection: Keep-Alive";
61 ustream_printf(cl->us, "%s %03i %s\r\n%s\r\n%s",
62 http_versions[cl->request.version],
63 code, summary, conn, enc);
65 if (!r->connection_close)
66 ustream_printf(cl->us, "Keep-Alive: timeout=%d\r\n", conf.http_keepalive);
69 static void uh_connection_close(struct client *cl)
71 cl->state = CLIENT_STATE_CLOSE;
73 ustream_state_change(cl->us);
76 static void uh_dispatch_done(struct client *cl)
78 if (cl->dispatch.free)
79 cl->dispatch.free(cl);
80 if (cl->dispatch.req_free)
81 cl->dispatch.req_free(cl);
84 static void client_timeout(struct uloop_timeout *timeout)
86 struct client *cl = container_of(timeout, struct client, timeout);
88 cl->state = CLIENT_STATE_CLOSE;
89 uh_connection_close(cl);
92 static void uh_set_client_timeout(struct client *cl, int timeout)
94 cl->timeout.cb = client_timeout;
95 uloop_timeout_set(&cl->timeout, timeout * 1000);
98 static void uh_keepalive_poll_cb(struct uloop_timeout *timeout)
100 struct client *cl = container_of(timeout, struct client, timeout);
101 int sec = cl->requests > 0 ? conf.http_keepalive : conf.network_timeout;
103 uh_set_client_timeout(cl, sec);
104 cl->us->notify_read(cl->us, 0);
107 static void uh_poll_connection(struct client *cl)
109 cl->timeout.cb = uh_keepalive_poll_cb;
110 uloop_timeout_set(&cl->timeout, 1);
113 void uh_request_done(struct client *cl)
116 uh_dispatch_done(cl);
117 memset(&cl->dispatch, 0, sizeof(cl->dispatch));
119 if (!conf.http_keepalive || cl->request.connection_close)
120 return uh_connection_close(cl);
122 cl->state = CLIENT_STATE_INIT;
124 uh_poll_connection(cl);
128 uh_client_error(struct client *cl, int code, const char *summary, const char *fmt, ...)
132 uh_http_header(cl, code, summary);
133 ustream_printf(cl->us, "Content-Type: text/html\r\n\r\n");
135 uh_chunk_printf(cl, "<h1>%s</h1>", summary);
139 uh_chunk_vprintf(cl, fmt, arg);
146 static void uh_header_error(struct client *cl, int code, const char *summary)
148 uh_client_error(cl, code, summary, NULL);
149 uh_connection_close(cl);
152 static int find_idx(const char * const *list, int max, const char *str)
156 for (i = 0; i < max; i++)
157 if (!strcmp(list[i], str))
163 static int client_parse_request(struct client *cl, char *data)
165 struct http_request *req = &cl->request;
166 char *type, *path, *version;
167 int h_method, h_version;
169 type = strtok(data, " ");
170 path = strtok(NULL, " ");
171 version = strtok(NULL, " ");
172 if (!type || !path || !version)
173 return CLIENT_STATE_DONE;
175 blobmsg_add_string(&cl->hdr, "URL", path);
177 memset(&cl->request, 0, sizeof(cl->request));
178 h_method = find_idx(http_methods, ARRAY_SIZE(http_methods), type);
179 h_version = find_idx(http_versions, ARRAY_SIZE(http_versions), version);
180 if (h_method < 0 || h_version < 0) {
181 req->version = UH_HTTP_VER_1_0;
182 return CLIENT_STATE_DONE;
185 req->method = h_method;
186 req->version = h_version;
187 if (req->version < UH_HTTP_VER_1_1 || req->method == UH_HTTP_MSG_POST ||
188 !conf.http_keepalive)
189 req->connection_close = true;
191 req->respond_chunked = uh_use_chunked(cl);
193 return CLIENT_STATE_HEADER;
196 static bool client_init_cb(struct client *cl, char *buf, int len)
200 newline = strstr(buf, "\r\n");
204 if (newline == buf) {
205 ustream_consume(cl->us, 2);
210 blob_buf_init(&cl->hdr, 0);
211 cl->state = client_parse_request(cl, buf);
212 ustream_consume(cl->us, newline + 2 - buf);
213 if (cl->state == CLIENT_STATE_DONE)
214 uh_header_error(cl, 400, "Bad Request");
219 static bool rfc1918_filter_check(struct client *cl)
221 if (!conf.rfc1918_filter)
224 if (!uh_addr_rfc1918(&cl->peer_addr) || uh_addr_rfc1918(&cl->srv_addr))
227 uh_client_error(cl, 403, "Forbidden",
228 "Rejected request from RFC1918 IP "
229 "to public server address");
233 static bool tls_redirect_check(struct client *cl)
236 struct blob_attr *cur;
237 char *ptr, *url = NULL, *host = NULL;
239 if (cl->tls || !conf.tls_redirect)
242 if ((port = uh_first_tls_port(cl->srv_addr.family)) == -1)
245 blob_for_each_attr(cur, cl->hdr.head, rem) {
246 if (!strcmp(blobmsg_name(cur), "host"))
247 host = blobmsg_get_string(cur);
249 if (!strcmp(blobmsg_name(cur), "URL"))
250 url = blobmsg_get_string(cur);
259 if ((ptr = strchr(host, ']')) != NULL)
261 else if ((ptr = strchr(host, ':')) != NULL)
264 cl->request.respond_chunked = false;
265 cl->request.connection_close = true;
267 uh_http_header(cl, 307, "Temporary Redirect");
270 ustream_printf(cl->us, "Location: https://%s:%d%s\r\n\r\n", host, port, url);
272 ustream_printf(cl->us, "Location: https://%s%s\r\n\r\n", host, url);
279 static void client_header_complete(struct client *cl)
281 struct http_request *r = &cl->request;
283 if (!rfc1918_filter_check(cl))
286 if (!tls_redirect_check(cl))
290 ustream_printf(cl->us, "HTTP/1.1 100 Continue\r\n\r\n");
294 if (r->method != UH_HTTP_MSG_POST)
299 r->connection_close = true;
305 uh_handle_request(cl);
308 static void client_parse_header(struct client *cl, char *data)
310 struct http_request *r = &cl->request;
316 uloop_timeout_cancel(&cl->timeout);
317 cl->state = CLIENT_STATE_DATA;
318 client_header_complete(cl);
322 val = uh_split_header(data);
324 cl->state = CLIENT_STATE_DONE;
328 for (name = data; *name; name++)
330 *name = tolower(*name);
332 if (!strcmp(data, "expect")) {
333 if (!strcasecmp(val, "100-continue"))
334 r->expect_cont = true;
336 uh_header_error(cl, 412, "Precondition Failed");
339 } else if (!strcmp(data, "content-length")) {
340 r->content_length = strtoul(val, &err, 0);
342 uh_header_error(cl, 400, "Bad Request");
345 } else if (!strcmp(data, "transfer-encoding")) {
346 if (!strcmp(val, "chunked"))
347 r->transfer_chunked = true;
348 } else if (!strcmp(data, "connection")) {
349 if (!strcasecmp(val, "close"))
350 r->connection_close = true;
351 } else if (!strcmp(data, "user-agent")) {
354 if (strstr(val, "Opera"))
356 else if ((str = strstr(val, "MSIE ")) != NULL) {
357 r->ua = UH_UA_MSIE_NEW;
358 if (str[5] && str[6] == '.') {
361 if (strstr(str, "SV1"))
366 r->ua = UH_UA_MSIE_OLD;
371 else if (strstr(val, "Chrome/"))
372 r->ua = UH_UA_CHROME;
373 else if (strstr(val, "Safari/") && strstr(val, "Mac OS X"))
374 r->ua = UH_UA_SAFARI;
375 else if (strstr(val, "Gecko/"))
377 else if (strstr(val, "Konqueror"))
378 r->ua = UH_UA_KONQUEROR;
382 blobmsg_add_string(&cl->hdr, data, val);
384 cl->state = CLIENT_STATE_HEADER;
387 void client_poll_post_data(struct client *cl)
389 struct dispatch *d = &cl->dispatch;
390 struct http_request *r = &cl->request;
394 if (cl->state == CLIENT_STATE_DONE)
402 buf = ustream_get_read_buf(cl->us, &len);
409 cur_len = min(r->content_length, len);
415 cur_len = d->data_send(cl, buf, cur_len);
417 r->content_length -= cur_len;
418 ustream_consume(cl->us, cur_len);
422 if (!r->transfer_chunked)
425 if (r->transfer_chunked > 1)
428 sep = strstr(buf + offset, "\r\n");
434 r->content_length = strtoul(buf + offset, &sep, 16);
435 r->transfer_chunked++;
436 ustream_consume(cl->us, sep + 2 - buf);
438 /* invalid chunk length */
440 r->content_length = 0;
441 r->transfer_chunked = 0;
445 /* empty chunk == eof */
446 if (!r->content_length) {
447 r->transfer_chunked = false;
452 buf = ustream_get_read_buf(cl->us, &len);
453 if (!r->content_length && !r->transfer_chunked &&
454 cl->state != CLIENT_STATE_DONE) {
455 if (cl->dispatch.data_done)
456 cl->dispatch.data_done(cl);
458 cl->state = CLIENT_STATE_DONE;
462 static bool client_data_cb(struct client *cl, char *buf, int len)
464 client_poll_post_data(cl);
468 static bool client_header_cb(struct client *cl, char *buf, int len)
473 newline = strstr(buf, "\r\n");
478 client_parse_header(cl, buf);
479 line_len = newline + 2 - buf;
480 ustream_consume(cl->us, line_len);
481 if (cl->state == CLIENT_STATE_DATA)
482 return client_data_cb(cl, newline + 2, len - line_len);
487 typedef bool (*read_cb_t)(struct client *cl, char *buf, int len);
488 static read_cb_t read_cbs[] = {
489 [CLIENT_STATE_INIT] = client_init_cb,
490 [CLIENT_STATE_HEADER] = client_header_cb,
491 [CLIENT_STATE_DATA] = client_data_cb,
494 void uh_client_read_cb(struct client *cl)
496 struct ustream *us = cl->us;
502 str = ustream_get_read_buf(us, &len);
506 if (cl->state >= array_size(read_cbs) || !read_cbs[cl->state])
509 if (!read_cbs[cl->state](cl, str, len)) {
510 if (len == us->r.buffer_len &&
511 cl->state != CLIENT_STATE_DATA)
512 uh_header_error(cl, 413, "Request Entity Too Large");
515 } while (!client_done);
518 static void client_close(struct client *cl)
521 cl->state = CLIENT_STATE_CLEANUP;
527 uh_dispatch_done(cl);
528 uloop_timeout_cancel(&cl->timeout);
530 uh_tls_client_detach(cl);
531 ustream_free(&cl->sfd.stream);
532 close(cl->sfd.fd.fd);
534 blob_buf_free(&cl->hdr);
537 uh_unblock_listeners();
540 void uh_client_notify_state(struct client *cl)
542 struct ustream *s = cl->us;
544 if (!s->write_error && cl->state != CLIENT_STATE_CLEANUP) {
545 if (cl->state == CLIENT_STATE_DATA)
548 if (!s->eof || s->w.data_bytes)
552 return client_close(cl);
555 static void client_ustream_read_cb(struct ustream *s, int bytes)
557 struct client *cl = container_of(s, struct client, sfd.stream);
559 uh_client_read_cb(cl);
562 static void client_ustream_write_cb(struct ustream *s, int bytes)
564 struct client *cl = container_of(s, struct client, sfd.stream);
566 if (cl->dispatch.write_cb)
567 cl->dispatch.write_cb(cl);
570 static void client_notify_state(struct ustream *s)
572 struct client *cl = container_of(s, struct client, sfd.stream);
574 uh_client_notify_state(cl);
577 static void set_addr(struct uh_addr *addr, void *src)
579 struct sockaddr_in *sin = src;
580 struct sockaddr_in6 *sin6 = src;
582 addr->family = sin->sin_family;
583 if (addr->family == AF_INET) {
584 addr->port = ntohs(sin->sin_port);
585 memcpy(&addr->in, &sin->sin_addr, sizeof(addr->in));
587 addr->port = ntohs(sin6->sin6_port);
588 memcpy(&addr->in6, &sin6->sin6_addr, sizeof(addr->in6));
592 bool uh_accept_client(int fd, bool tls)
594 static struct client *next_client;
598 static int client_id = 0;
599 struct sockaddr_in6 addr;
602 next_client = calloc(1, sizeof(*next_client));
607 sfd = accept(fd, (struct sockaddr *) &addr, &sl);
611 set_addr(&cl->peer_addr, &addr);
613 getsockname(sfd, (struct sockaddr *) &addr, &sl);
614 set_addr(&cl->srv_addr, &addr);
616 cl->us = &cl->sfd.stream;
618 uh_tls_client_attach(cl);
620 cl->us->notify_read = client_ustream_read_cb;
621 cl->us->notify_write = client_ustream_write_cb;
622 cl->us->notify_state = client_notify_state;
625 cl->us->string_data = true;
626 ustream_fd_init(&cl->sfd, sfd);
628 uh_poll_connection(cl);
629 list_add_tail(&cl->list, &clients);
633 cl->id = client_id++;
639 void uh_close_fds(void)
644 uh_close_listen_fds();
645 list_for_each_entry(cl, &clients, list) {
646 close(cl->sfd.fd.fd);
647 if (cl->dispatch.close_fds)
648 cl->dispatch.close_fds(cl);