1 /*
2 * http_server - HTTP server
3 * Copyright (c) 2009, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "includes.h"
10 #include <fcntl.h>
11
12 #include "common.h"
13 #include "eloop.h"
14 #include "httpread.h"
15 #include "http_server.h"
16
17 #define HTTP_SERVER_TIMEOUT 30
18 #define HTTP_SERVER_MAX_REQ_LEN 8000
19 #define HTTP_SERVER_MAX_CONNECTIONS 10
20
21 struct http_request {
22 struct http_request *next;
23 struct http_server *srv;
24 int fd;
25 struct sockaddr_in cli;
26 struct httpread *hread;
27 };
28
29 struct http_server {
30 void (*cb)(void *ctx, struct http_request *req);
31 void *cb_ctx;
32
33 int fd;
34 int port;
35
36 struct http_request *requests;
37 unsigned int request_count;
38 };
39
40
http_request_cb(struct httpread * handle,void * cookie,enum httpread_event en)41 static void http_request_cb(struct httpread *handle, void *cookie,
42 enum httpread_event en)
43 {
44 struct http_request *req = cookie;
45 struct http_server *srv = req->srv;
46
47 if (en == HTTPREAD_EVENT_FILE_READY) {
48 wpa_printf(MSG_DEBUG, "HTTP: Request from %s:%d received",
49 inet_ntoa(req->cli.sin_addr),
50 ntohs(req->cli.sin_port));
51 srv->cb(srv->cb_ctx, req);
52 return;
53 }
54 wpa_printf(MSG_DEBUG, "HTTP: Request from %s:%d could not be received "
55 "completely", inet_ntoa(req->cli.sin_addr),
56 ntohs(req->cli.sin_port));
57 http_request_deinit(req);
58 }
59
60
http_request_init(struct http_server * srv,int fd,struct sockaddr_in * cli)61 static struct http_request * http_request_init(struct http_server *srv, int fd,
62 struct sockaddr_in *cli)
63 {
64 struct http_request *req;
65
66 if (srv->request_count >= HTTP_SERVER_MAX_CONNECTIONS) {
67 wpa_printf(MSG_DEBUG, "HTTP: Too many concurrent requests");
68 return NULL;
69 }
70
71 req = os_zalloc(sizeof(*req));
72 if (req == NULL)
73 return NULL;
74
75 req->srv = srv;
76 req->fd = fd;
77 req->cli = *cli;
78
79 req->hread = httpread_create(req->fd, http_request_cb, req,
80 HTTP_SERVER_MAX_REQ_LEN,
81 HTTP_SERVER_TIMEOUT);
82 if (req->hread == NULL) {
83 http_request_deinit(req);
84 return NULL;
85 }
86
87 return req;
88 }
89
90
http_request_deinit(struct http_request * req)91 void http_request_deinit(struct http_request *req)
92 {
93 struct http_request *r, *p;
94 struct http_server *srv;
95
96 if (req == NULL)
97 return;
98
99 srv = req->srv;
100 p = NULL;
101 r = srv->requests;
102 while (r) {
103 if (r == req) {
104 if (p)
105 p->next = r->next;
106 else
107 srv->requests = r->next;
108 srv->request_count--;
109 break;
110 }
111 p = r;
112 r = r->next;
113 }
114
115 httpread_destroy(req->hread);
116 close(req->fd);
117 os_free(req);
118 }
119
120
http_request_free_all(struct http_request * req)121 static void http_request_free_all(struct http_request *req)
122 {
123 struct http_request *prev;
124 while (req) {
125 prev = req;
126 req = req->next;
127 http_request_deinit(prev);
128 }
129 }
130
131
http_request_send(struct http_request * req,struct wpabuf * resp)132 void http_request_send(struct http_request *req, struct wpabuf *resp)
133 {
134 int res;
135
136 wpa_printf(MSG_DEBUG, "HTTP: Send %lu byte response to %s:%d",
137 (unsigned long) wpabuf_len(resp),
138 inet_ntoa(req->cli.sin_addr),
139 ntohs(req->cli.sin_port));
140
141 res = send(req->fd, wpabuf_head(resp), wpabuf_len(resp), 0);
142 if (res < 0) {
143 wpa_printf(MSG_DEBUG, "HTTP: Send failed: %s",
144 strerror(errno));
145 } else if ((size_t) res < wpabuf_len(resp)) {
146 wpa_printf(MSG_DEBUG, "HTTP: Sent only %d of %lu bytes",
147 res, (unsigned long) wpabuf_len(resp));
148 /* TODO: add eloop handler for sending rest of the data */
149 }
150
151 wpabuf_free(resp);
152 }
153
154
http_request_send_and_deinit(struct http_request * req,struct wpabuf * resp)155 void http_request_send_and_deinit(struct http_request *req,
156 struct wpabuf *resp)
157 {
158 http_request_send(req, resp);
159 http_request_deinit(req);
160 }
161
162
http_request_get_type(struct http_request * req)163 enum httpread_hdr_type http_request_get_type(struct http_request *req)
164 {
165 return httpread_hdr_type_get(req->hread);
166 }
167
168
http_request_get_uri(struct http_request * req)169 char * http_request_get_uri(struct http_request *req)
170 {
171 return httpread_uri_get(req->hread);
172 }
173
174
http_request_get_hdr(struct http_request * req)175 char * http_request_get_hdr(struct http_request *req)
176 {
177 return httpread_hdr_get(req->hread);
178 }
179
180
http_request_get_data(struct http_request * req)181 char * http_request_get_data(struct http_request *req)
182 {
183 return httpread_data_get(req->hread);
184 }
185
186
http_request_get_hdr_line(struct http_request * req,const char * tag)187 char * http_request_get_hdr_line(struct http_request *req, const char *tag)
188 {
189 return httpread_hdr_line_get(req->hread, tag);
190 }
191
192
http_request_get_cli_addr(struct http_request * req)193 struct sockaddr_in * http_request_get_cli_addr(struct http_request *req)
194 {
195 return &req->cli;
196 }
197
198
http_server_cb(int sd,void * eloop_ctx,void * sock_ctx)199 static void http_server_cb(int sd, void *eloop_ctx, void *sock_ctx)
200 {
201 struct sockaddr_in addr;
202 socklen_t addr_len = sizeof(addr);
203 struct http_server *srv = eloop_ctx;
204 int conn;
205 struct http_request *req;
206
207 conn = accept(srv->fd, (struct sockaddr *) &addr, &addr_len);
208 if (conn < 0) {
209 wpa_printf(MSG_DEBUG, "HTTP: Failed to accept new connection: "
210 "%s", strerror(errno));
211 return;
212 }
213 wpa_printf(MSG_DEBUG, "HTTP: Connection from %s:%d",
214 inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
215
216 req = http_request_init(srv, conn, &addr);
217 if (req == NULL) {
218 close(conn);
219 return;
220 }
221
222 req->next = srv->requests;
223 srv->requests = req;
224 srv->request_count++;
225 }
226
227
http_server_init(struct in_addr * addr,int port,void (* cb)(void * ctx,struct http_request * req),void * cb_ctx)228 struct http_server * http_server_init(struct in_addr *addr, int port,
229 void (*cb)(void *ctx,
230 struct http_request *req),
231 void *cb_ctx)
232 {
233 struct sockaddr_in sin;
234 struct http_server *srv;
235 int on = 1;
236
237 srv = os_zalloc(sizeof(*srv));
238 if (srv == NULL)
239 return NULL;
240 srv->cb = cb;
241 srv->cb_ctx = cb_ctx;
242
243 srv->fd = socket(AF_INET, SOCK_STREAM, 0);
244 if (srv->fd < 0)
245 goto fail;
246
247 if (setsockopt(srv->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
248 {
249 wpa_printf(MSG_DEBUG,
250 "HTTP: setsockopt(SO_REUSEADDR) failed: %s",
251 strerror(errno));
252 /* try to continue anyway */
253 }
254
255 if (fcntl(srv->fd, F_SETFL, O_NONBLOCK) < 0)
256 goto fail;
257 if (port < 0)
258 srv->port = 49152;
259 else
260 srv->port = port;
261
262 os_memset(&sin, 0, sizeof(sin));
263 sin.sin_family = AF_INET;
264 sin.sin_addr.s_addr = addr->s_addr;
265
266 for (;;) {
267 sin.sin_port = htons(srv->port);
268 if (bind(srv->fd, (struct sockaddr *) &sin, sizeof(sin)) == 0)
269 break;
270 if (errno == EADDRINUSE) {
271 /* search for unused port */
272 if (++srv->port == 65535 || port >= 0)
273 goto fail;
274 continue;
275 }
276 wpa_printf(MSG_DEBUG, "HTTP: Failed to bind server port %d: "
277 "%s", srv->port, strerror(errno));
278 goto fail;
279 }
280 if (listen(srv->fd, 10 /* max backlog */) < 0 ||
281 fcntl(srv->fd, F_SETFL, O_NONBLOCK) < 0 ||
282 eloop_register_sock(srv->fd, EVENT_TYPE_READ, http_server_cb,
283 srv, NULL))
284 goto fail;
285
286 wpa_printf(MSG_DEBUG, "HTTP: Started server on %s:%d",
287 inet_ntoa(*addr), srv->port);
288
289 return srv;
290
291 fail:
292 http_server_deinit(srv);
293 return NULL;
294 }
295
296
http_server_deinit(struct http_server * srv)297 void http_server_deinit(struct http_server *srv)
298 {
299 if (srv == NULL)
300 return;
301 if (srv->fd >= 0) {
302 eloop_unregister_sock(srv->fd, EVENT_TYPE_READ);
303 close(srv->fd);
304 }
305 http_request_free_all(srv->requests);
306
307 os_free(srv);
308 }
309
310
http_server_get_port(struct http_server * srv)311 int http_server_get_port(struct http_server *srv)
312 {
313 return srv->port;
314 }
315