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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