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
);
78 static void client_timeout(struct uloop_timeout
*timeout
)
80 struct client
*cl
= container_of(timeout
, struct client
, timeout
);
82 cl
->state
= CLIENT_STATE_CLOSE
;
83 uh_connection_close(cl
);
86 static void uh_set_client_timeout(struct client
*cl
, int timeout
)
88 cl
->timeout
.cb
= client_timeout
;
89 uloop_timeout_set(&cl
->timeout
, timeout
* 1000);
92 static void uh_keepalive_poll_cb(struct uloop_timeout
*timeout
)
94 struct client
*cl
= container_of(timeout
, struct client
, timeout
);
95 int sec
= cl
->requests
> 0 ? conf
.http_keepalive
: conf
.network_timeout
;
97 uh_set_client_timeout(cl
, sec
);
98 cl
->us
->notify_read(cl
->us
, 0);
101 static void uh_poll_connection(struct client
*cl
)
103 cl
->timeout
.cb
= uh_keepalive_poll_cb
;
104 uloop_timeout_set(&cl
->timeout
, 1);
107 void uh_request_done(struct client
*cl
)
110 uh_dispatch_done(cl
);
111 cl
->us
->notify_write
= NULL
;
112 memset(&cl
->dispatch
, 0, sizeof(cl
->dispatch
));
114 if (!conf
.http_keepalive
|| cl
->request
.connection_close
)
115 return uh_connection_close(cl
);
117 cl
->state
= CLIENT_STATE_INIT
;
119 uh_poll_connection(cl
);
123 uh_client_error(struct client
*cl
, int code
, const char *summary
, const char *fmt
, ...)
127 uh_http_header(cl
, code
, summary
);
128 ustream_printf(cl
->us
, "Content-Type: text/html\r\n\r\n");
130 uh_chunk_printf(cl
, "<h1>%s</h1>", summary
);
134 uh_chunk_vprintf(cl
, fmt
, arg
);
141 static void uh_header_error(struct client
*cl
, int code
, const char *summary
)
143 uh_client_error(cl
, code
, summary
, NULL
);
144 uh_connection_close(cl
);
147 static int find_idx(const char * const *list
, int max
, const char *str
)
151 for (i
= 0; i
< max
; i
++)
152 if (!strcmp(list
[i
], str
))
158 static int client_parse_request(struct client
*cl
, char *data
)
160 struct http_request
*req
= &cl
->request
;
161 char *type
, *path
, *version
;
162 int h_method
, h_version
;
164 type
= strtok(data
, " ");
165 path
= strtok(NULL
, " ");
166 version
= strtok(NULL
, " ");
167 if (!type
|| !path
|| !version
)
168 return CLIENT_STATE_DONE
;
170 blobmsg_add_string(&cl
->hdr
, "URL", path
);
172 memset(&cl
->request
, 0, sizeof(cl
->request
));
173 h_method
= find_idx(http_methods
, ARRAY_SIZE(http_methods
), type
);
174 h_version
= find_idx(http_versions
, ARRAY_SIZE(http_versions
), version
);
175 if (h_method
< 0 || h_version
< 0) {
176 req
->version
= UH_HTTP_VER_1_0
;
177 return CLIENT_STATE_DONE
;
180 req
->method
= h_method
;
181 req
->version
= h_version
;
182 if (req
->version
< UH_HTTP_VER_1_1
|| !conf
.http_keepalive
)
183 req
->connection_close
= true;
185 return CLIENT_STATE_HEADER
;
188 static bool client_init_cb(struct client
*cl
, char *buf
, int len
)
192 newline
= strstr(buf
, "\r\n");
200 blob_buf_init(&cl
->hdr
, 0);
201 cl
->state
= client_parse_request(cl
, buf
);
202 ustream_consume(cl
->us
, newline
+ 2 - buf
);
203 if (cl
->state
== CLIENT_STATE_DONE
)
204 uh_header_error(cl
, 400, "Bad Request");
209 static bool rfc1918_filter_check(struct client
*cl
)
211 if (!conf
.rfc1918_filter
)
214 if (!uh_addr_rfc1918(&cl
->peer_addr
) || uh_addr_rfc1918(&cl
->srv_addr
))
217 uh_client_error(cl
, 403, "Forbidden",
218 "Rejected request from RFC1918 IP "
219 "to public server address");
223 static void client_header_complete(struct client
*cl
)
225 struct http_request
*r
= &cl
->request
;
227 if (!rfc1918_filter_check(cl
))
231 ustream_printf(cl
->us
, "HTTP/1.1 100 Continue\r\n\r\n");
235 if (r
->method
!= UH_HTTP_MSG_POST
)
240 r
->connection_close
= true;
246 uh_handle_request(cl
);
249 static void client_parse_header(struct client
*cl
, char *data
)
251 struct http_request
*r
= &cl
->request
;
257 uloop_timeout_cancel(&cl
->timeout
);
258 cl
->state
= CLIENT_STATE_DATA
;
259 client_header_complete(cl
);
263 val
= uh_split_header(data
);
265 cl
->state
= CLIENT_STATE_DONE
;
269 for (name
= data
; *name
; name
++)
271 *name
= tolower(*name
);
273 if (!strcmp(data
, "expect")) {
274 if (!strcasecmp(val
, "100-continue"))
275 r
->expect_cont
= true;
277 uh_header_error(cl
, 412, "Precondition Failed");
280 } else if (!strcmp(data
, "content-length")) {
281 r
->content_length
= strtoul(val
, &err
, 0);
283 uh_header_error(cl
, 400, "Bad Request");
286 } else if (!strcmp(data
, "transfer-encoding")) {
287 if (!strcmp(val
, "chunked"))
288 r
->transfer_chunked
= true;
289 } else if (!strcmp(data
, "connection")) {
290 if (!strcasecmp(val
, "close"))
291 r
->connection_close
= true;
292 else if (!strcasecmp(val
, "keep-alive"))
293 r
->connection_close
= false;
294 } else if (!strcmp(data
, "user-agent")) {
297 if (strstr(val
, "Opera"))
299 else if ((str
= strstr(val
, "MSIE ")) != NULL
) {
300 r
->ua
= UH_UA_MSIE_NEW
;
301 if (str
[5] && str
[6] == '.') {
304 if (strstr(str
, "SV1"))
309 r
->ua
= UH_UA_MSIE_OLD
;
313 } else if (strstr(val
, "Safari/") && strstr(val
, "Mac OS X"))
314 r
->ua
= UH_UA_SAFARI
;
315 else if (strstr(val
, "Chrome/"))
316 r
->ua
= UH_UA_CHROME
;
317 else if (strstr(val
, "Gecko/"))
319 else if (strstr(val
, "Konqueror"))
320 r
->ua
= UH_UA_KONQUEROR
;
324 blobmsg_add_string(&cl
->hdr
, data
, val
);
326 cl
->state
= CLIENT_STATE_HEADER
;
329 void client_poll_post_data(struct client
*cl
)
331 struct dispatch
*d
= &cl
->dispatch
;
332 struct http_request
*r
= &cl
->request
;
336 if (cl
->state
== CLIENT_STATE_DONE
)
344 buf
= ustream_get_read_buf(cl
->us
, &len
);
351 cur_len
= min(r
->content_length
, len
);
357 cur_len
= d
->data_send(cl
, buf
, cur_len
);
359 r
->content_length
-= cur_len
;
360 ustream_consume(cl
->us
, cur_len
);
364 if (!r
->transfer_chunked
)
367 if (r
->transfer_chunked
> 1)
370 sep
= strstr(buf
+ offset
, "\r\n");
376 r
->content_length
= strtoul(buf
+ offset
, &sep
, 16);
377 r
->transfer_chunked
++;
378 ustream_consume(cl
->us
, sep
+ 2 - buf
);
380 /* invalid chunk length */
382 r
->content_length
= 0;
383 r
->transfer_chunked
= 0;
387 /* empty chunk == eof */
388 if (!r
->content_length
) {
389 r
->transfer_chunked
= false;
394 buf
= ustream_get_read_buf(cl
->us
, &len
);
395 if (!r
->content_length
&& !r
->transfer_chunked
&&
396 cl
->state
!= CLIENT_STATE_DONE
) {
397 if (cl
->dispatch
.data_done
)
398 cl
->dispatch
.data_done(cl
);
400 cl
->state
= CLIENT_STATE_DONE
;
404 static bool client_data_cb(struct client
*cl
, char *buf
, int len
)
406 client_poll_post_data(cl
);
410 static bool client_header_cb(struct client
*cl
, char *buf
, int len
)
415 newline
= strstr(buf
, "\r\n");
420 client_parse_header(cl
, buf
);
421 line_len
= newline
+ 2 - buf
;
422 ustream_consume(cl
->us
, line_len
);
423 if (cl
->state
== CLIENT_STATE_DATA
)
424 return client_data_cb(cl
, newline
+ 2, len
- line_len
);
429 typedef bool (*read_cb_t
)(struct client
*cl
, char *buf
, int len
);
430 static read_cb_t read_cbs
[] = {
431 [CLIENT_STATE_INIT
] = client_init_cb
,
432 [CLIENT_STATE_HEADER
] = client_header_cb
,
433 [CLIENT_STATE_DATA
] = client_data_cb
,
436 void uh_client_read_cb(struct client
*cl
)
438 struct ustream
*us
= cl
->us
;
443 str
= ustream_get_read_buf(us
, &len
);
447 if (cl
->state
>= array_size(read_cbs
) || !read_cbs
[cl
->state
])
450 if (!read_cbs
[cl
->state
](cl
, str
, len
)) {
451 if (len
== us
->r
.buffer_len
&&
452 cl
->state
!= CLIENT_STATE_DATA
)
453 uh_header_error(cl
, 413, "Request Entity Too Large");
459 static void client_close(struct client
*cl
)
462 uh_dispatch_done(cl
);
463 uloop_timeout_cancel(&cl
->timeout
);
465 uh_tls_client_detach(cl
);
466 ustream_free(&cl
->sfd
.stream
);
467 close(cl
->sfd
.fd
.fd
);
469 blob_buf_free(&cl
->hdr
);
472 uh_unblock_listeners();
475 void uh_client_notify_state(struct client
*cl
)
477 struct ustream
*s
= cl
->us
;
479 if (!s
->write_error
) {
480 if (cl
->state
== CLIENT_STATE_DATA
)
483 if (!s
->eof
|| s
->w
.data_bytes
)
487 return client_close(cl
);
490 static void client_ustream_read_cb(struct ustream
*s
, int bytes
)
492 struct client
*cl
= container_of(s
, struct client
, sfd
.stream
);
494 uh_client_read_cb(cl
);
497 static void client_ustream_write_cb(struct ustream
*s
, int bytes
)
499 struct client
*cl
= container_of(s
, struct client
, sfd
.stream
);
501 if (cl
->dispatch
.write_cb
)
502 cl
->dispatch
.write_cb(cl
);
505 static void client_notify_state(struct ustream
*s
)
507 struct client
*cl
= container_of(s
, struct client
, sfd
.stream
);
509 uh_client_notify_state(cl
);
512 static void set_addr(struct uh_addr
*addr
, void *src
)
514 struct sockaddr_in
*sin
= src
;
515 struct sockaddr_in6
*sin6
= src
;
517 addr
->family
= sin
->sin_family
;
518 if (addr
->family
== AF_INET
) {
519 addr
->port
= ntohs(sin
->sin_port
);
520 memcpy(&addr
->in
, &sin
->sin_addr
, sizeof(addr
->in
));
522 addr
->port
= ntohs(sin6
->sin6_port
);
523 memcpy(&addr
->in6
, &sin6
->sin6_addr
, sizeof(addr
->in6
));
527 bool uh_accept_client(int fd
, bool tls
)
529 static struct client
*next_client
;
533 static int client_id
= 0;
534 struct sockaddr_in6 addr
;
537 next_client
= calloc(1, sizeof(*next_client
));
542 sfd
= accept(fd
, (struct sockaddr
*) &addr
, &sl
);
546 set_addr(&cl
->peer_addr
, &addr
);
548 getsockname(sfd
, (struct sockaddr
*) &addr
, &sl
);
549 set_addr(&cl
->srv_addr
, &addr
);
551 cl
->us
= &cl
->sfd
.stream
;
553 uh_tls_client_attach(cl
);
555 cl
->us
->notify_read
= client_ustream_read_cb
;
556 cl
->us
->notify_write
= client_ustream_write_cb
;
557 cl
->us
->notify_state
= client_notify_state
;
560 cl
->us
->string_data
= true;
561 ustream_fd_init(&cl
->sfd
, sfd
);
563 uh_poll_connection(cl
);
564 list_add_tail(&cl
->list
, &clients
);
568 cl
->id
= client_id
++;
573 void uh_close_fds(void)
578 uh_close_listen_fds();
579 list_for_each_entry(cl
, &clients
, list
) {
580 close(cl
->sfd
.fd
.fd
);
581 if (cl
->dispatch
.close_fds
)
582 cl
->dispatch
.close_fds(cl
);