fix getting local server address
[project/uhttpd.git] / client.c
1 /*
2 * uhttpd - Tiny single-threaded httpd
3 *
4 * Copyright (C) 2010-2012 Jo-Philipp Wich <xm@subsignal.org>
5 * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
6 *
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
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
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.
18 */
19
20 #include <libubox/blobmsg.h>
21 #include <ctype.h>
22
23 #include "uhttpd.h"
24 #include "tls.h"
25
26 static LIST_HEAD(clients);
27
28 int n_clients = 0;
29 struct config conf = {};
30
31 const char * const http_versions[] = {
32 [UH_HTTP_VER_0_9] = "HTTP/0.9",
33 [UH_HTTP_VER_1_0] = "HTTP/1.0",
34 [UH_HTTP_VER_1_1] = "HTTP/1.1",
35 };
36
37 const char * const http_methods[] = {
38 [UH_HTTP_MSG_GET] = "GET",
39 [UH_HTTP_MSG_POST] = "POST",
40 [UH_HTTP_MSG_HEAD] = "HEAD",
41 };
42
43 void uh_http_header(struct client *cl, int code, const char *summary)
44 {
45 const char *enc = "Transfer-Encoding: chunked\r\n";
46 const char *conn;
47
48 if (!uh_use_chunked(cl))
49 enc = "";
50
51 if (cl->request.version != UH_HTTP_VER_1_1)
52 conn = "Connection: close";
53 else
54 conn = "Connection: keep-alive";
55
56 ustream_printf(cl->us, "%s %03i %s\r\n%s\r\n%s",
57 http_versions[cl->request.version],
58 code, summary, conn, enc);
59 }
60
61 static void uh_connection_close(struct client *cl)
62 {
63 cl->state = CLIENT_STATE_CLOSE;
64 cl->us->eof = true;
65 ustream_state_change(cl->us);
66 }
67
68 static void uh_dispatch_done(struct client *cl)
69 {
70 if (cl->dispatch.free)
71 cl->dispatch.free(cl);
72 }
73
74 void uh_request_done(struct client *cl)
75 {
76 uh_chunk_eof(cl);
77 uh_dispatch_done(cl);
78 cl->us->notify_write = NULL;
79 memset(&cl->dispatch, 0, sizeof(cl->dispatch));
80
81 if (cl->request.version != UH_HTTP_VER_1_1 || !conf.http_keepalive) {
82 uh_connection_close(cl);
83 return;
84 }
85
86 cl->state = CLIENT_STATE_INIT;
87 uloop_timeout_set(&cl->timeout, conf.http_keepalive * 1000);
88 }
89
90 void __printf(4, 5)
91 uh_client_error(struct client *cl, int code, const char *summary, const char *fmt, ...)
92 {
93 va_list arg;
94
95 uh_http_header(cl, code, summary);
96 ustream_printf(cl->us, "Content-Type: text/html\r\n\r\n");
97
98 uh_chunk_printf(cl, "<h1>%s</h1>", summary);
99
100 if (fmt) {
101 va_start(arg, fmt);
102 uh_chunk_vprintf(cl, fmt, arg);
103 va_end(arg);
104 }
105
106 uh_request_done(cl);
107 }
108
109 static void uh_header_error(struct client *cl, int code, const char *summary)
110 {
111 uh_client_error(cl, code, summary, NULL);
112 uh_connection_close(cl);
113 }
114
115 static void client_timeout(struct uloop_timeout *timeout)
116 {
117 struct client *cl = container_of(timeout, struct client, timeout);
118
119 cl->state = CLIENT_STATE_CLOSE;
120 uh_connection_close(cl);
121 }
122
123 static int find_idx(const char * const *list, int max, const char *str)
124 {
125 int i;
126
127 for (i = 0; i < max; i++)
128 if (!strcmp(list[i], str))
129 return i;
130
131 return -1;
132 }
133
134 static int client_parse_request(struct client *cl, char *data)
135 {
136 struct http_request *req = &cl->request;
137 char *type, *path, *version;
138 int h_method, h_version;
139
140 type = strtok(data, " ");
141 path = strtok(NULL, " ");
142 version = strtok(NULL, " ");
143 if (!type || !path || !version)
144 return CLIENT_STATE_DONE;
145
146 blobmsg_add_string(&cl->hdr, "URL", path);
147
148 memset(&cl->request, 0, sizeof(cl->request));
149 h_method = find_idx(http_methods, ARRAY_SIZE(http_methods), type);
150 h_version = find_idx(http_versions, ARRAY_SIZE(http_versions), version);
151 if (h_method < 0 || h_version < 0) {
152 req->version = UH_HTTP_VER_1_0;
153 return CLIENT_STATE_DONE;
154 }
155
156 req->method = h_method;
157 req->version = h_version;
158
159 return CLIENT_STATE_HEADER;
160 }
161
162 static bool client_init_cb(struct client *cl, char *buf, int len)
163 {
164 char *newline;
165
166 newline = strstr(buf, "\r\n");
167 if (!newline)
168 return false;
169
170 *newline = 0;
171 blob_buf_init(&cl->hdr, 0);
172 cl->state = client_parse_request(cl, buf);
173 ustream_consume(cl->us, newline + 2 - buf);
174 if (cl->state == CLIENT_STATE_DONE)
175 uh_header_error(cl, 400, "Bad Request");
176
177 return true;
178 }
179
180 static bool rfc1918_filter_check(struct client *cl)
181 {
182 if (!conf.rfc1918_filter)
183 return true;
184
185 if (!uh_addr_rfc1918(&cl->peer_addr) || uh_addr_rfc1918(&cl->srv_addr))
186 return true;
187
188 uh_client_error(cl, 403, "Forbidden",
189 "Rejected request from RFC1918 IP "
190 "to public server address");
191 return false;
192 }
193
194 static void client_header_complete(struct client *cl)
195 {
196 if (!rfc1918_filter_check(cl))
197 return;
198
199 if (cl->request.expect_cont)
200 ustream_printf(cl->us, "HTTP/1.1 100 Continue\r\n\r\n");
201
202 uh_handle_request(cl);
203 }
204
205 static void client_parse_header(struct client *cl, char *data)
206 {
207 struct http_request *r = &cl->request;
208 char *err;
209 char *name;
210 char *val;
211
212 if (!*data) {
213 uloop_timeout_cancel(&cl->timeout);
214 cl->state = CLIENT_STATE_DATA;
215 client_header_complete(cl);
216 return;
217 }
218
219 val = uh_split_header(data);
220 if (!val) {
221 cl->state = CLIENT_STATE_DONE;
222 return;
223 }
224
225 for (name = data; *name; name++)
226 if (isupper(*name))
227 *name = tolower(*name);
228
229 if (!strcmp(data, "expect")) {
230 if (!strcasecmp(val, "100-continue"))
231 r->expect_cont = true;
232 else {
233 uh_header_error(cl, 412, "Precondition Failed");
234 return;
235 }
236 } else if (!strcmp(data, "content-length")) {
237 r->content_length = strtoul(val, &err, 0);
238 if (err && *err) {
239 uh_header_error(cl, 400, "Bad Request");
240 return;
241 }
242 } else if (!strcmp(data, "transfer-encoding")) {
243 if (!strcmp(val, "chunked"))
244 r->transfer_chunked = true;
245 }
246
247
248 blobmsg_add_string(&cl->hdr, data, val);
249
250 cl->state = CLIENT_STATE_HEADER;
251 }
252
253 void client_poll_post_data(struct client *cl)
254 {
255 struct dispatch *d = &cl->dispatch;
256 struct http_request *r = &cl->request;
257 char *buf;
258 int len;
259
260 if (cl->state == CLIENT_STATE_DONE)
261 return;
262
263 while (1) {
264 char *sep;
265 int offset = 0;
266 int cur_len;
267
268 buf = ustream_get_read_buf(cl->us, &len);
269 if (!buf || !len)
270 break;
271
272 if (!d->data_send)
273 return;
274
275 cur_len = min(r->content_length, len);
276 if (cur_len) {
277 if (d->data_blocked)
278 break;
279
280 if (d->data_send)
281 cur_len = d->data_send(cl, buf, cur_len);
282
283 r->content_length -= cur_len;
284 ustream_consume(cl->us, cur_len);
285 continue;
286 }
287
288 if (!r->transfer_chunked)
289 break;
290
291 if (r->transfer_chunked > 1)
292 offset = 2;
293
294 sep = strstr(buf + offset, "\r\n");
295 if (!sep)
296 break;
297
298 *sep = 0;
299
300 r->content_length = strtoul(buf + offset, &sep, 16);
301 r->transfer_chunked++;
302 ustream_consume(cl->us, sep + 2 - buf);
303
304 /* invalid chunk length */
305 if (sep && *sep) {
306 r->content_length = 0;
307 r->transfer_chunked = 0;
308 break;
309 }
310
311 /* empty chunk == eof */
312 if (!r->content_length) {
313 r->transfer_chunked = false;
314 break;
315 }
316 }
317
318 buf = ustream_get_read_buf(cl->us, &len);
319 if (!r->content_length && !r->transfer_chunked &&
320 cl->state != CLIENT_STATE_DONE) {
321 if (cl->dispatch.data_done)
322 cl->dispatch.data_done(cl);
323
324 cl->state = CLIENT_STATE_DONE;
325 }
326 }
327
328 static bool client_data_cb(struct client *cl, char *buf, int len)
329 {
330 client_poll_post_data(cl);
331 return false;
332 }
333
334 static bool client_header_cb(struct client *cl, char *buf, int len)
335 {
336 char *newline;
337 int line_len;
338
339 newline = strstr(buf, "\r\n");
340 if (!newline)
341 return false;
342
343 *newline = 0;
344 client_parse_header(cl, buf);
345 line_len = newline + 2 - buf;
346 ustream_consume(cl->us, line_len);
347 if (cl->state == CLIENT_STATE_DATA)
348 return client_data_cb(cl, newline + 2, len - line_len);
349
350 return true;
351 }
352
353 typedef bool (*read_cb_t)(struct client *cl, char *buf, int len);
354 static read_cb_t read_cbs[] = {
355 [CLIENT_STATE_INIT] = client_init_cb,
356 [CLIENT_STATE_HEADER] = client_header_cb,
357 [CLIENT_STATE_DATA] = client_data_cb,
358 };
359
360 void uh_client_read_cb(struct client *cl)
361 {
362 struct ustream *us = cl->us;
363 char *str;
364 int len;
365
366 do {
367 str = ustream_get_read_buf(us, &len);
368 if (!str || !len)
369 break;
370
371 if (cl->state >= array_size(read_cbs) || !read_cbs[cl->state])
372 break;
373
374 if (!read_cbs[cl->state](cl, str, len)) {
375 if (len == us->r.buffer_len &&
376 cl->state != CLIENT_STATE_DATA)
377 uh_header_error(cl, 413, "Request Entity Too Large");
378 break;
379 }
380 } while(1);
381 }
382
383 static void client_close(struct client *cl)
384 {
385 n_clients--;
386 uh_dispatch_done(cl);
387 uloop_timeout_cancel(&cl->timeout);
388 if (cl->tls)
389 uh_tls_client_detach(cl);
390 ustream_free(&cl->sfd.stream);
391 close(cl->sfd.fd.fd);
392 list_del(&cl->list);
393 blob_buf_free(&cl->hdr);
394 free(cl);
395
396 uh_unblock_listeners();
397 }
398
399 void uh_client_notify_state(struct client *cl)
400 {
401 struct ustream *s = cl->us;
402
403 if (!s->write_error) {
404 if (cl->state == CLIENT_STATE_DATA)
405 return;
406
407 if (!s->eof || s->w.data_bytes)
408 return;
409 }
410
411 return client_close(cl);
412 }
413
414 static void client_ustream_read_cb(struct ustream *s, int bytes)
415 {
416 struct client *cl = container_of(s, struct client, sfd);
417
418 uh_client_read_cb(cl);
419 }
420
421 static void client_ustream_write_cb(struct ustream *s, int bytes)
422 {
423 struct client *cl = container_of(s, struct client, sfd);
424
425 if (cl->dispatch.write_cb)
426 cl->dispatch.write_cb(cl);
427 }
428
429 static void client_notify_state(struct ustream *s)
430 {
431 struct client *cl = container_of(s, struct client, sfd);
432
433 uh_client_notify_state(cl);
434 }
435
436 static void set_addr(struct uh_addr *addr, void *src)
437 {
438 struct sockaddr_in *sin = src;
439 struct sockaddr_in6 *sin6 = src;
440
441 addr->family = sin->sin_family;
442 if (addr->family == AF_INET) {
443 addr->port = ntohs(sin->sin_port);
444 memcpy(&addr->in, &sin->sin_addr, sizeof(addr->in));
445 } else {
446 addr->port = ntohs(sin6->sin6_port);
447 memcpy(&addr->in6, &sin6->sin6_addr, sizeof(addr->in6));
448 }
449 }
450
451 bool uh_accept_client(int fd, bool tls)
452 {
453 static struct client *next_client;
454 struct client *cl;
455 unsigned int sl;
456 int sfd;
457 static int client_id = 0;
458 struct sockaddr_in6 addr;
459
460 if (!next_client)
461 next_client = calloc(1, sizeof(*next_client));
462
463 cl = next_client;
464
465 sl = sizeof(addr);
466 sfd = accept(fd, (struct sockaddr *) &addr, &sl);
467 if (sfd < 0)
468 return false;
469
470 set_addr(&cl->peer_addr, &addr);
471 sl = sizeof(addr);
472 getsockname(sfd, (struct sockaddr *) &addr, &sl);
473 set_addr(&cl->srv_addr, &addr);
474
475 cl->us = &cl->sfd.stream;
476 if (tls) {
477 uh_tls_client_attach(cl);
478 } else {
479 cl->us->notify_read = client_ustream_read_cb;
480 cl->us->notify_write = client_ustream_write_cb;
481 cl->us->notify_state = client_notify_state;
482 }
483
484 cl->us->string_data = true;
485 ustream_fd_init(&cl->sfd, sfd);
486
487 cl->timeout.cb = client_timeout;
488 uloop_timeout_set(&cl->timeout, conf.network_timeout * 1000);
489
490 list_add_tail(&cl->list, &clients);
491
492 next_client = NULL;
493 n_clients++;
494 cl->id = client_id++;
495
496 return true;
497 }
498
499 void uh_close_fds(void)
500 {
501 struct client *cl;
502
503 uloop_done();
504 uh_close_listen_fds();
505 list_for_each_entry(cl, &clients, list) {
506 close(cl->sfd.fd.fd);
507 if (cl->dispatch.close_fds)
508 cl->dispatch.close_fds(cl);
509 }
510 }