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";
51 if (!uh_use_chunked(cl))
54 if (r->connection_close)
55 conn = "Connection: close";
57 conn = "Connection: Keep-Alive";
59 ustream_printf(cl->us, "%s %03i %s\r\n%s\r\n%s",
60 http_versions[cl->request.version],
61 code, summary, conn, enc);
63 if (!r->connection_close)
64 ustream_printf(cl->us, "Keep-Alive: timeout=%d\r\n", conf.http_keepalive);
67 static void uh_connection_close(struct client *cl)
69 cl->state = CLIENT_STATE_CLOSE;
71 ustream_state_change(cl->us);
74 static void uh_dispatch_done(struct client *cl)
76 if (cl->dispatch.free)
77 cl->dispatch.free(cl);
78 if (cl->dispatch.req_free)
79 cl->dispatch.req_free(cl);
82 static void client_timeout(struct uloop_timeout *timeout)
84 struct client *cl = container_of(timeout, struct client, timeout);
86 cl->state = CLIENT_STATE_CLOSE;
87 uh_connection_close(cl);
90 static void uh_set_client_timeout(struct client *cl, int timeout)
92 cl->timeout.cb = client_timeout;
93 uloop_timeout_set(&cl->timeout, timeout * 1000);
96 static void uh_keepalive_poll_cb(struct uloop_timeout *timeout)
98 struct client *cl = container_of(timeout, struct client, timeout);
99 int sec = cl->requests > 0 ? conf.http_keepalive : conf.network_timeout;
101 uh_set_client_timeout(cl, sec);
102 cl->us->notify_read(cl->us, 0);
105 static void uh_poll_connection(struct client *cl)
107 cl->timeout.cb = uh_keepalive_poll_cb;
108 uloop_timeout_set(&cl->timeout, 1);
111 void uh_request_done(struct client *cl)
114 uh_dispatch_done(cl);
115 memset(&cl->dispatch, 0, sizeof(cl->dispatch));
117 if (!conf.http_keepalive || cl->request.connection_close)
118 return uh_connection_close(cl);
120 cl->state = CLIENT_STATE_INIT;
122 uh_poll_connection(cl);
126 uh_client_error(struct client *cl, int code, const char *summary, const char *fmt, ...)
130 uh_http_header(cl, code, summary);
131 ustream_printf(cl->us, "Content-Type: text/html\r\n\r\n");
133 uh_chunk_printf(cl, "<h1>%s</h1>", summary);
137 uh_chunk_vprintf(cl, fmt, arg);
144 static void uh_header_error(struct client *cl, int code, const char *summary)
146 uh_client_error(cl, code, summary, NULL);
147 uh_connection_close(cl);
150 static int find_idx(const char * const *list, int max, const char *str)
154 for (i = 0; i < max; i++)
155 if (!strcmp(list[i], str))
161 static int client_parse_request(struct client *cl, char *data)
163 struct http_request *req = &cl->request;
164 char *type, *path, *version;
165 int h_method, h_version;
167 type = strtok(data, " ");
168 path = strtok(NULL, " ");
169 version = strtok(NULL, " ");
170 if (!type || !path || !version)
171 return CLIENT_STATE_DONE;
173 blobmsg_add_string(&cl->hdr, "URL", path);
175 memset(&cl->request, 0, sizeof(cl->request));
176 h_method = find_idx(http_methods, ARRAY_SIZE(http_methods), type);
177 h_version = find_idx(http_versions, ARRAY_SIZE(http_versions), version);
178 if (h_method < 0 || h_version < 0) {
179 req->version = UH_HTTP_VER_1_0;
180 return CLIENT_STATE_DONE;
183 req->method = h_method;
184 req->version = h_version;
185 if (req->version < UH_HTTP_VER_1_1 || req->method == UH_HTTP_MSG_POST ||
186 !conf.http_keepalive)
187 req->connection_close = true;
189 return CLIENT_STATE_HEADER;
192 static bool client_init_cb(struct client *cl, char *buf, int len)
196 newline = strstr(buf, "\r\n");
200 if (newline == buf) {
201 ustream_consume(cl->us, 2);
206 blob_buf_init(&cl->hdr, 0);
207 cl->state = client_parse_request(cl, buf);
208 ustream_consume(cl->us, newline + 2 - buf);
209 if (cl->state == CLIENT_STATE_DONE)
210 uh_header_error(cl, 400, "Bad Request");
215 static bool rfc1918_filter_check(struct client *cl)
217 if (!conf.rfc1918_filter)
220 if (!uh_addr_rfc1918(&cl->peer_addr) || uh_addr_rfc1918(&cl->srv_addr))
223 uh_client_error(cl, 403, "Forbidden",
224 "Rejected request from RFC1918 IP "
225 "to public server address");
229 static void client_header_complete(struct client *cl)
231 struct http_request *r = &cl->request;
233 if (!rfc1918_filter_check(cl))
237 ustream_printf(cl->us, "HTTP/1.1 100 Continue\r\n\r\n");
241 if (r->method != UH_HTTP_MSG_POST)
246 r->connection_close = true;
252 uh_handle_request(cl);
255 static void client_parse_header(struct client *cl, char *data)
257 struct http_request *r = &cl->request;
263 uloop_timeout_cancel(&cl->timeout);
264 cl->state = CLIENT_STATE_DATA;
265 client_header_complete(cl);
269 val = uh_split_header(data);
271 cl->state = CLIENT_STATE_DONE;
275 for (name = data; *name; name++)
277 *name = tolower(*name);
279 if (!strcmp(data, "expect")) {
280 if (!strcasecmp(val, "100-continue"))
281 r->expect_cont = true;
283 uh_header_error(cl, 412, "Precondition Failed");
286 } else if (!strcmp(data, "content-length")) {
287 r->content_length = strtoul(val, &err, 0);
289 uh_header_error(cl, 400, "Bad Request");
292 } else if (!strcmp(data, "transfer-encoding")) {
293 if (!strcmp(val, "chunked"))
294 r->transfer_chunked = true;
295 } else if (!strcmp(data, "connection")) {
296 if (!strcasecmp(val, "close"))
297 r->connection_close = true;
298 } else if (!strcmp(data, "user-agent")) {
301 if (strstr(val, "Opera"))
303 else if ((str = strstr(val, "MSIE ")) != NULL) {
304 r->ua = UH_UA_MSIE_NEW;
305 if (str[5] && str[6] == '.') {
308 if (strstr(str, "SV1"))
313 r->ua = UH_UA_MSIE_OLD;
318 else if (strstr(val, "Chrome/"))
319 r->ua = UH_UA_CHROME;
320 else if (strstr(val, "Safari/") && strstr(val, "Mac OS X"))
321 r->ua = UH_UA_SAFARI;
322 else if (strstr(val, "Gecko/"))
324 else if (strstr(val, "Konqueror"))
325 r->ua = UH_UA_KONQUEROR;
329 blobmsg_add_string(&cl->hdr, data, val);
331 cl->state = CLIENT_STATE_HEADER;
334 void client_poll_post_data(struct client *cl)
336 struct dispatch *d = &cl->dispatch;
337 struct http_request *r = &cl->request;
341 if (cl->state == CLIENT_STATE_DONE)
349 buf = ustream_get_read_buf(cl->us, &len);
356 cur_len = min(r->content_length, len);
362 cur_len = d->data_send(cl, buf, cur_len);
364 r->content_length -= cur_len;
365 ustream_consume(cl->us, cur_len);
369 if (!r->transfer_chunked)
372 if (r->transfer_chunked > 1)
375 sep = strstr(buf + offset, "\r\n");
381 r->content_length = strtoul(buf + offset, &sep, 16);
382 r->transfer_chunked++;
383 ustream_consume(cl->us, sep + 2 - buf);
385 /* invalid chunk length */
387 r->content_length = 0;
388 r->transfer_chunked = 0;
392 /* empty chunk == eof */
393 if (!r->content_length) {
394 r->transfer_chunked = false;
399 buf = ustream_get_read_buf(cl->us, &len);
400 if (!r->content_length && !r->transfer_chunked &&
401 cl->state != CLIENT_STATE_DONE) {
402 if (cl->dispatch.data_done)
403 cl->dispatch.data_done(cl);
405 cl->state = CLIENT_STATE_DONE;
409 static bool client_data_cb(struct client *cl, char *buf, int len)
411 client_poll_post_data(cl);
415 static bool client_header_cb(struct client *cl, char *buf, int len)
420 newline = strstr(buf, "\r\n");
425 client_parse_header(cl, buf);
426 line_len = newline + 2 - buf;
427 ustream_consume(cl->us, line_len);
428 if (cl->state == CLIENT_STATE_DATA)
429 return client_data_cb(cl, newline + 2, len - line_len);
434 typedef bool (*read_cb_t)(struct client *cl, char *buf, int len);
435 static read_cb_t read_cbs[] = {
436 [CLIENT_STATE_INIT] = client_init_cb,
437 [CLIENT_STATE_HEADER] = client_header_cb,
438 [CLIENT_STATE_DATA] = client_data_cb,
441 void uh_client_read_cb(struct client *cl)
443 struct ustream *us = cl->us;
449 str = ustream_get_read_buf(us, &len);
453 if (cl->state >= array_size(read_cbs) || !read_cbs[cl->state])
456 if (!read_cbs[cl->state](cl, str, len)) {
457 if (len == us->r.buffer_len &&
458 cl->state != CLIENT_STATE_DATA)
459 uh_header_error(cl, 413, "Request Entity Too Large");
462 } while (!client_done);
465 static void client_close(struct client *cl)
468 cl->state = CLIENT_STATE_CLEANUP;
474 uh_dispatch_done(cl);
475 uloop_timeout_cancel(&cl->timeout);
477 uh_tls_client_detach(cl);
478 ustream_free(&cl->sfd.stream);
479 close(cl->sfd.fd.fd);
481 blob_buf_free(&cl->hdr);
484 uh_unblock_listeners();
487 void uh_client_notify_state(struct client *cl)
489 struct ustream *s = cl->us;
491 if (!s->write_error && cl->state != CLIENT_STATE_CLEANUP) {
492 if (cl->state == CLIENT_STATE_DATA)
495 if (!s->eof || s->w.data_bytes)
499 return client_close(cl);
502 static void client_ustream_read_cb(struct ustream *s, int bytes)
504 struct client *cl = container_of(s, struct client, sfd.stream);
506 uh_client_read_cb(cl);
509 static void client_ustream_write_cb(struct ustream *s, int bytes)
511 struct client *cl = container_of(s, struct client, sfd.stream);
513 if (cl->dispatch.write_cb)
514 cl->dispatch.write_cb(cl);
517 static void client_notify_state(struct ustream *s)
519 struct client *cl = container_of(s, struct client, sfd.stream);
521 uh_client_notify_state(cl);
524 static void set_addr(struct uh_addr *addr, void *src)
526 struct sockaddr_in *sin = src;
527 struct sockaddr_in6 *sin6 = src;
529 addr->family = sin->sin_family;
530 if (addr->family == AF_INET) {
531 addr->port = ntohs(sin->sin_port);
532 memcpy(&addr->in, &sin->sin_addr, sizeof(addr->in));
534 addr->port = ntohs(sin6->sin6_port);
535 memcpy(&addr->in6, &sin6->sin6_addr, sizeof(addr->in6));
539 bool uh_accept_client(int fd, bool tls)
541 static struct client *next_client;
545 static int client_id = 0;
546 struct sockaddr_in6 addr;
549 next_client = calloc(1, sizeof(*next_client));
554 sfd = accept(fd, (struct sockaddr *) &addr, &sl);
558 set_addr(&cl->peer_addr, &addr);
560 getsockname(sfd, (struct sockaddr *) &addr, &sl);
561 set_addr(&cl->srv_addr, &addr);
563 cl->us = &cl->sfd.stream;
565 uh_tls_client_attach(cl);
567 cl->us->notify_read = client_ustream_read_cb;
568 cl->us->notify_write = client_ustream_write_cb;
569 cl->us->notify_state = client_notify_state;
572 cl->us->string_data = true;
573 ustream_fd_init(&cl->sfd, sfd);
575 uh_poll_connection(cl);
576 list_add_tail(&cl->list, &clients);
580 cl->id = client_id++;
586 void uh_close_fds(void)
591 uh_close_listen_fds();
592 list_for_each_entry(cl, &clients, list) {
593 close(cl->sfd.fd.fd);
594 if (cl->dispatch.close_fds)
595 cl->dispatch.close_fds(cl);