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_client_error_header(struct client *cl, int code, const char *summary)
56 uh_http_header(cl, code, summary);
57 ustream_printf(cl->us, "Content-Type: text/plain\r\n\r\n");
60 static void uh_connection_close(struct client *cl)
62 cl->state = CLIENT_STATE_DONE;
64 ustream_state_change(cl->us);
67 static void uh_dispatch_done(struct client *cl)
69 if (cl->dispatch_free)
70 cl->dispatch_free(cl);
71 cl->dispatch_free = NULL;
74 void uh_request_done(struct client *cl)
78 cl->us->notify_write = NULL;
79 memset(&cl->data, 0, sizeof(cl->data));
81 if (cl->request.version != UH_HTTP_VER_1_1 || !conf.http_keepalive) {
82 uh_connection_close(cl);
86 cl->state = CLIENT_STATE_INIT;
87 uloop_timeout_set(&cl->timeout, conf.http_keepalive * 1000);
91 uh_client_error(struct client *cl, int code, const char *summary, const char *fmt, ...)
95 uh_client_error_header(cl, code, summary);
98 uh_chunk_vprintf(cl, fmt, arg);
104 static void uh_header_error(struct client *cl, int code, const char *summary)
106 uh_client_error(cl, code, summary, "%s", summary);
107 uh_connection_close(cl);
110 static void client_timeout(struct uloop_timeout *timeout)
112 struct client *cl = container_of(timeout, struct client, timeout);
114 cl->state = CLIENT_STATE_CLOSE;
115 uh_connection_close(cl);
118 static int client_parse_request(struct client *cl, char *data)
120 struct http_request *req = &cl->request;
121 char *type, *path, *version;
124 type = strtok(data, " ");
125 path = strtok(NULL, " ");
126 version = strtok(NULL, " ");
127 if (!type || !path || !version)
128 return CLIENT_STATE_DONE;
131 if (!strcmp(type, "GET"))
132 req->method = UH_HTTP_MSG_GET;
133 else if (!strcmp(type, "POST"))
134 req->method = UH_HTTP_MSG_POST;
135 else if (!strcmp(type, "HEAD"))
136 req->method = UH_HTTP_MSG_HEAD;
138 return CLIENT_STATE_DONE;
140 cl->request.version = -1;
141 i = array_size(http_versions);
143 if (!strcmp(version, http_versions[i])) {
144 cl->request.version = i;
148 if (cl->request.version < 0)
149 return CLIENT_STATE_DONE;
151 return CLIENT_STATE_HEADER;
154 static bool client_init_cb(struct client *cl, char *buf, int len)
158 newline = strstr(buf, "\r\n");
163 blob_buf_init(&cl->hdr, 0);
164 blobmsg_add_string(&cl->hdr, "REQUEST", buf);
165 ustream_consume(cl->us, newline + 2 - buf);
166 cl->state = client_parse_request(cl, (char *) blobmsg_data(blob_data(cl->hdr.head)));
167 if (cl->state == CLIENT_STATE_DONE)
168 uh_header_error(cl, 400, "Bad Request");
173 static void client_header_complete(struct client *cl)
175 uh_handle_file_request(cl);
178 static int client_parse_header(struct client *cl, char *data)
184 uloop_timeout_cancel(&cl->timeout);
185 client_header_complete(cl);
186 return CLIENT_STATE_DATA;
189 val = strchr(data, ':');
191 return CLIENT_STATE_DONE;
196 while (isspace(*val))
199 for (name = data; *name; name++)
201 *name = tolower(*name);
203 blobmsg_add_string(&cl->hdr, data, val);
205 return CLIENT_STATE_HEADER;
208 static bool client_data_cb(struct client *cl, char *buf, int len)
213 static bool client_header_cb(struct client *cl, char *buf, int len)
218 newline = strstr(buf, "\r\n");
223 cl->state = client_parse_header(cl, buf);
224 line_len = newline + 2 - buf;
225 ustream_consume(cl->us, line_len);
226 if (cl->state == CLIENT_STATE_DATA)
227 client_data_cb(cl, newline + 2, len - line_len);
232 typedef bool (*read_cb_t)(struct client *cl, char *buf, int len);
233 static read_cb_t read_cbs[] = {
234 [CLIENT_STATE_INIT] = client_init_cb,
235 [CLIENT_STATE_HEADER] = client_header_cb,
236 [CLIENT_STATE_DATA] = client_data_cb,
239 static void client_read_cb(struct client *cl)
241 struct ustream *us = cl->us;
246 str = ustream_get_read_buf(us, &len);
250 if (cl->state >= array_size(read_cbs) || !read_cbs[cl->state])
253 if (!read_cbs[cl->state](cl, str, len)) {
254 if (len == us->r.buffer_len)
255 uh_header_error(cl, 413, "Request Entity Too Large");
261 static void client_close(struct client *cl)
263 uh_dispatch_done(cl);
264 uloop_timeout_cancel(&cl->timeout);
265 ustream_free(&cl->sfd.stream);
266 close(cl->sfd.fd.fd);
270 uh_unblock_listeners();
273 static void client_ustream_read_cb(struct ustream *s, int bytes)
275 struct client *cl = container_of(s, struct client, sfd);
280 static void client_ustream_write_cb(struct ustream *s, int bytes)
282 struct client *cl = container_of(s, struct client, sfd);
284 if (cl->dispatch_write_cb)
285 cl->dispatch_write_cb(cl);
288 static void client_notify_state(struct ustream *s)
290 struct client *cl = container_of(s, struct client, sfd);
292 if (cl->state == CLIENT_STATE_CLOSE ||
293 (s->eof && !s->w.data_bytes) || s->write_error)
294 return client_close(cl);
297 void uh_accept_client(int fd)
299 static struct client *next_client;
303 static int client_id = 0;
306 next_client = calloc(1, sizeof(*next_client));
310 sl = sizeof(cl->peeraddr);
311 sfd = accept(fd, (struct sockaddr *) &cl->peeraddr, &sl);
315 sl = sizeof(cl->servaddr);
316 getsockname(fd, (struct sockaddr *) &cl->servaddr, &sl);
317 cl->us = &cl->sfd.stream;
318 cl->us->string_data = true;
319 cl->us->notify_read = client_ustream_read_cb;
320 cl->us->notify_write = client_ustream_write_cb;
321 cl->us->notify_state = client_notify_state;
322 ustream_fd_init(&cl->sfd, sfd);
324 cl->timeout.cb = client_timeout;
325 uloop_timeout_set(&cl->timeout, conf.network_timeout * 1000);
327 list_add_tail(&cl->list, &clients);
331 cl->id = client_id++;