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
, 302, "Found");
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
);