2 * uhttpd - Tiny single-threaded httpd
4 * Copyright (C) 2010-2012 Jo-Philipp Wich <xm@subsignal.org>
5 * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
20 #include <libubox/blobmsg.h>
25 static LIST_HEAD(clients);
28 struct config conf = {};
30 static const char *http_versions[] = {
31 [UH_HTTP_VER_0_9] = "HTTP/0.9",
32 [UH_HTTP_VER_1_0] = "HTTP/1.0",
33 [UH_HTTP_VER_1_1] = "HTTP/1.1",
36 void uh_http_header(struct client *cl, int code, const char *summary)
38 const char *enc = "Transfer-Encoding: chunked\r\n";
41 if (!uh_use_chunked(cl))
44 if (cl->request.version != UH_HTTP_VER_1_1)
45 conn = "Connection: close";
47 conn = "Connection: keep-alive";
49 ustream_printf(cl->us, "%s %03i %s\r\n%s\r\n%s",
50 http_versions[cl->request.version],
51 code, summary, conn, enc);
54 static void uh_connection_close(struct client *cl)
56 cl->state = CLIENT_STATE_DONE;
58 ustream_state_change(cl->us);
61 static void uh_dispatch_done(struct client *cl)
63 if (cl->dispatch.free)
64 cl->dispatch.free(cl);
67 void uh_request_done(struct client *cl)
71 cl->us->notify_write = NULL;
72 memset(&cl->dispatch, 0, sizeof(cl->dispatch));
74 if (cl->request.version != UH_HTTP_VER_1_1 || !conf.http_keepalive) {
75 uh_connection_close(cl);
79 cl->state = CLIENT_STATE_INIT;
80 uloop_timeout_set(&cl->timeout, conf.http_keepalive * 1000);
84 uh_client_error(struct client *cl, int code, const char *summary, const char *fmt, ...)
88 uh_http_header(cl, code, summary);
89 ustream_printf(cl->us, "Content-Type: text/html\r\n\r\n");
91 uh_chunk_printf(cl, "<h1>%s</h1>", summary);
95 uh_chunk_vprintf(cl, fmt, arg);
102 static void uh_header_error(struct client *cl, int code, const char *summary)
104 uh_client_error(cl, code, summary, NULL);
105 uh_connection_close(cl);
108 static void client_timeout(struct uloop_timeout *timeout)
110 struct client *cl = container_of(timeout, struct client, timeout);
112 cl->state = CLIENT_STATE_CLOSE;
113 uh_connection_close(cl);
116 static int client_parse_request(struct client *cl, char *data)
118 struct http_request *req = &cl->request;
119 char *type, *path, *version;
122 type = strtok(data, " ");
123 path = strtok(NULL, " ");
124 version = strtok(NULL, " ");
125 if (!type || !path || !version)
126 return CLIENT_STATE_DONE;
129 if (!strcmp(type, "GET"))
130 req->method = UH_HTTP_MSG_GET;
131 else if (!strcmp(type, "POST"))
132 req->method = UH_HTTP_MSG_POST;
133 else if (!strcmp(type, "HEAD"))
134 req->method = UH_HTTP_MSG_HEAD;
136 return CLIENT_STATE_DONE;
138 cl->request.version = -1;
139 i = array_size(http_versions);
141 if (!strcmp(version, http_versions[i])) {
142 cl->request.version = i;
146 if (cl->request.version < 0)
147 return CLIENT_STATE_DONE;
149 return CLIENT_STATE_HEADER;
152 static bool client_init_cb(struct client *cl, char *buf, int len)
156 newline = strstr(buf, "\r\n");
161 blob_buf_init(&cl->hdr, 0);
162 blobmsg_add_string(&cl->hdr, "REQUEST", buf);
163 ustream_consume(cl->us, newline + 2 - buf);
164 cl->state = client_parse_request(cl, (char *) blobmsg_data(blob_data(cl->hdr.head)));
165 if (cl->state == CLIENT_STATE_DONE)
166 uh_header_error(cl, 400, "Bad Request");
171 static void client_header_complete(struct client *cl)
173 uh_handle_file_request(cl);
176 static int client_parse_header(struct client *cl, char *data)
182 uloop_timeout_cancel(&cl->timeout);
183 client_header_complete(cl);
184 return CLIENT_STATE_DATA;
187 val = strchr(data, ':');
189 return CLIENT_STATE_DONE;
194 while (isspace(*val))
197 for (name = data; *name; name++)
199 *name = tolower(*name);
201 blobmsg_add_string(&cl->hdr, data, val);
203 return CLIENT_STATE_HEADER;
206 static bool client_data_cb(struct client *cl, char *buf, int len)
211 static bool client_header_cb(struct client *cl, char *buf, int len)
216 newline = strstr(buf, "\r\n");
221 cl->state = client_parse_header(cl, buf);
222 line_len = newline + 2 - buf;
223 ustream_consume(cl->us, line_len);
224 if (cl->state == CLIENT_STATE_DATA)
225 client_data_cb(cl, newline + 2, len - line_len);
230 typedef bool (*read_cb_t)(struct client *cl, char *buf, int len);
231 static read_cb_t read_cbs[] = {
232 [CLIENT_STATE_INIT] = client_init_cb,
233 [CLIENT_STATE_HEADER] = client_header_cb,
234 [CLIENT_STATE_DATA] = client_data_cb,
237 static void client_read_cb(struct client *cl)
239 struct ustream *us = cl->us;
244 str = ustream_get_read_buf(us, &len);
248 if (cl->state >= array_size(read_cbs) || !read_cbs[cl->state])
251 if (!read_cbs[cl->state](cl, str, len)) {
252 if (len == us->r.buffer_len)
253 uh_header_error(cl, 413, "Request Entity Too Large");
259 static void client_close(struct client *cl)
261 uh_dispatch_done(cl);
262 uloop_timeout_cancel(&cl->timeout);
263 ustream_free(&cl->sfd.stream);
264 close(cl->sfd.fd.fd);
268 uh_unblock_listeners();
271 static void client_ustream_read_cb(struct ustream *s, int bytes)
273 struct client *cl = container_of(s, struct client, sfd);
278 static void client_ustream_write_cb(struct ustream *s, int bytes)
280 struct client *cl = container_of(s, struct client, sfd);
282 if (cl->dispatch.write_cb)
283 cl->dispatch.write_cb(cl);
286 static void client_notify_state(struct ustream *s)
288 struct client *cl = container_of(s, struct client, sfd);
290 if (cl->state == CLIENT_STATE_CLOSE ||
291 (s->eof && !s->w.data_bytes) || s->write_error)
292 return client_close(cl);
295 void uh_accept_client(int fd)
297 static struct client *next_client;
301 static int client_id = 0;
304 next_client = calloc(1, sizeof(*next_client));
308 sl = sizeof(cl->peeraddr);
309 sfd = accept(fd, (struct sockaddr *) &cl->peeraddr, &sl);
313 sl = sizeof(cl->servaddr);
314 getsockname(fd, (struct sockaddr *) &cl->servaddr, &sl);
315 cl->us = &cl->sfd.stream;
316 cl->us->string_data = true;
317 cl->us->notify_read = client_ustream_read_cb;
318 cl->us->notify_write = client_ustream_write_cb;
319 cl->us->notify_state = client_notify_state;
320 ustream_fd_init(&cl->sfd, sfd);
322 cl->timeout.cb = client_timeout;
323 uloop_timeout_set(&cl->timeout, conf.network_timeout * 1000);
325 list_add_tail(&cl->list, &clients);
329 cl->id = client_id++;
332 void uh_close_fds(void)
337 uh_close_listen_fds();
338 list_for_each_entry(cl, &clients, list) {
339 close(cl->sfd.fd.fd);
340 if (cl->dispatch.close_fds)
341 cl->dispatch.close_fds(cl);