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);
65 cl->dispatch_free = NULL;
68 void uh_request_done(struct client *cl)
72 cl->us->notify_write = NULL;
73 memset(&cl->data, 0, sizeof(cl->data));
75 if (cl->request.version != UH_HTTP_VER_1_1 || !conf.http_keepalive) {
76 uh_connection_close(cl);
80 cl->state = CLIENT_STATE_INIT;
81 uloop_timeout_set(&cl->timeout, conf.http_keepalive * 1000);
85 uh_client_error(struct client *cl, int code, const char *summary, const char *fmt, ...)
89 uh_http_header(cl, code, summary);
90 ustream_printf(cl->us, "Content-Type: text/html\r\n\r\n");
92 uh_chunk_printf(cl, "<h1>%s</h1>", summary);
96 uh_chunk_vprintf(cl, fmt, arg);
103 static void uh_header_error(struct client *cl, int code, const char *summary)
105 uh_client_error(cl, code, summary, NULL);
106 uh_connection_close(cl);
109 static void client_timeout(struct uloop_timeout *timeout)
111 struct client *cl = container_of(timeout, struct client, timeout);
113 cl->state = CLIENT_STATE_CLOSE;
114 uh_connection_close(cl);
117 static int client_parse_request(struct client *cl, char *data)
119 struct http_request *req = &cl->request;
120 char *type, *path, *version;
123 type = strtok(data, " ");
124 path = strtok(NULL, " ");
125 version = strtok(NULL, " ");
126 if (!type || !path || !version)
127 return CLIENT_STATE_DONE;
130 if (!strcmp(type, "GET"))
131 req->method = UH_HTTP_MSG_GET;
132 else if (!strcmp(type, "POST"))
133 req->method = UH_HTTP_MSG_POST;
134 else if (!strcmp(type, "HEAD"))
135 req->method = UH_HTTP_MSG_HEAD;
137 return CLIENT_STATE_DONE;
139 cl->request.version = -1;
140 i = array_size(http_versions);
142 if (!strcmp(version, http_versions[i])) {
143 cl->request.version = i;
147 if (cl->request.version < 0)
148 return CLIENT_STATE_DONE;
150 return CLIENT_STATE_HEADER;
153 static bool client_init_cb(struct client *cl, char *buf, int len)
157 newline = strstr(buf, "\r\n");
162 blob_buf_init(&cl->hdr, 0);
163 blobmsg_add_string(&cl->hdr, "REQUEST", buf);
164 ustream_consume(cl->us, newline + 2 - buf);
165 cl->state = client_parse_request(cl, (char *) blobmsg_data(blob_data(cl->hdr.head)));
166 if (cl->state == CLIENT_STATE_DONE)
167 uh_header_error(cl, 400, "Bad Request");
172 static void client_header_complete(struct client *cl)
174 uh_handle_file_request(cl);
177 static int client_parse_header(struct client *cl, char *data)
183 uloop_timeout_cancel(&cl->timeout);
184 client_header_complete(cl);
185 return CLIENT_STATE_DATA;
188 val = strchr(data, ':');
190 return CLIENT_STATE_DONE;
195 while (isspace(*val))
198 for (name = data; *name; name++)
200 *name = tolower(*name);
202 blobmsg_add_string(&cl->hdr, data, val);
204 return CLIENT_STATE_HEADER;
207 static bool client_data_cb(struct client *cl, char *buf, int len)
212 static bool client_header_cb(struct client *cl, char *buf, int len)
217 newline = strstr(buf, "\r\n");
222 cl->state = client_parse_header(cl, buf);
223 line_len = newline + 2 - buf;
224 ustream_consume(cl->us, line_len);
225 if (cl->state == CLIENT_STATE_DATA)
226 client_data_cb(cl, newline + 2, len - line_len);
231 typedef bool (*read_cb_t)(struct client *cl, char *buf, int len);
232 static read_cb_t read_cbs[] = {
233 [CLIENT_STATE_INIT] = client_init_cb,
234 [CLIENT_STATE_HEADER] = client_header_cb,
235 [CLIENT_STATE_DATA] = client_data_cb,
238 static void client_read_cb(struct client *cl)
240 struct ustream *us = cl->us;
245 str = ustream_get_read_buf(us, &len);
249 if (cl->state >= array_size(read_cbs) || !read_cbs[cl->state])
252 if (!read_cbs[cl->state](cl, str, len)) {
253 if (len == us->r.buffer_len)
254 uh_header_error(cl, 413, "Request Entity Too Large");
260 static void client_close(struct client *cl)
262 uh_dispatch_done(cl);
263 uloop_timeout_cancel(&cl->timeout);
264 ustream_free(&cl->sfd.stream);
265 close(cl->sfd.fd.fd);
269 uh_unblock_listeners();
272 static void client_ustream_read_cb(struct ustream *s, int bytes)
274 struct client *cl = container_of(s, struct client, sfd);
279 static void client_ustream_write_cb(struct ustream *s, int bytes)
281 struct client *cl = container_of(s, struct client, sfd);
283 if (cl->dispatch_write_cb)
284 cl->dispatch_write_cb(cl);
287 static void client_notify_state(struct ustream *s)
289 struct client *cl = container_of(s, struct client, sfd);
291 if (cl->state == CLIENT_STATE_CLOSE ||
292 (s->eof && !s->w.data_bytes) || s->write_error)
293 return client_close(cl);
296 void uh_accept_client(int fd)
298 static struct client *next_client;
302 static int client_id = 0;
305 next_client = calloc(1, sizeof(*next_client));
309 sl = sizeof(cl->peeraddr);
310 sfd = accept(fd, (struct sockaddr *) &cl->peeraddr, &sl);
314 sl = sizeof(cl->servaddr);
315 getsockname(fd, (struct sockaddr *) &cl->servaddr, &sl);
316 cl->us = &cl->sfd.stream;
317 cl->us->string_data = true;
318 cl->us->notify_read = client_ustream_read_cb;
319 cl->us->notify_write = client_ustream_write_cb;
320 cl->us->notify_state = client_notify_state;
321 ustream_fd_init(&cl->sfd, sfd);
323 cl->timeout.cb = client_timeout;
324 uloop_timeout_set(&cl->timeout, conf.network_timeout * 1000);
326 list_add_tail(&cl->list, &clients);
330 cl->id = client_id++;