set the docroot to the current working directory if none is specified, fixes random...
[project/uhttpd.git] / client.c
1 /*
2  * uhttpd - Tiny single-threaded httpd
3  *
4  *   Copyright (C) 2010-2013 Jo-Philipp Wich <xm@subsignal.org>
5  *   Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
6  *
7  * Permission to use, copy, modify, and/or distribute this software for any
8  * purpose with or without fee is hereby granted, provided that the above
9  * copyright notice and this permission notice appear in all copies.
10  *
11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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         struct http_request *r = &cl->request;
46         const char *enc = "Transfer-Encoding: chunked\r\n";
47         const char *conn;
48
49         if (!uh_use_chunked(cl))
50                 enc = "";
51
52         if (r->connection_close)
53                 conn = "Connection: close";
54         else
55                 conn = "Connection: Keep-Alive";
56
57         ustream_printf(cl->us, "%s %03i %s\r\n%s\r\n%s",
58                 http_versions[cl->request.version],
59                 code, summary, conn, enc);
60
61         if (!r->connection_close)
62                 ustream_printf(cl->us, "Keep-Alive: timeout=%d\r\n", conf.http_keepalive);
63 }
64
65 static void uh_connection_close(struct client *cl)
66 {
67         cl->state = CLIENT_STATE_CLOSE;
68         cl->us->eof = true;
69         ustream_state_change(cl->us);
70 }
71
72 static void uh_dispatch_done(struct client *cl)
73 {
74         if (cl->dispatch.free)
75                 cl->dispatch.free(cl);
76         if (cl->dispatch.req_free)
77                 cl->dispatch.req_free(cl);
78 }
79
80 static void client_timeout(struct uloop_timeout *timeout)
81 {
82         struct client *cl = container_of(timeout, struct client, timeout);
83
84         cl->state = CLIENT_STATE_CLOSE;
85         uh_connection_close(cl);
86 }
87
88 static void uh_set_client_timeout(struct client *cl, int timeout)
89 {
90         cl->timeout.cb = client_timeout;
91         uloop_timeout_set(&cl->timeout, timeout * 1000);
92 }
93
94 static void uh_keepalive_poll_cb(struct uloop_timeout *timeout)
95 {
96         struct client *cl = container_of(timeout, struct client, timeout);
97         int sec = cl->requests > 0 ? conf.http_keepalive : conf.network_timeout;
98
99         uh_set_client_timeout(cl, sec);
100         cl->us->notify_read(cl->us, 0);
101 }
102
103 static void uh_poll_connection(struct client *cl)
104 {
105         cl->timeout.cb = uh_keepalive_poll_cb;
106         uloop_timeout_set(&cl->timeout, 1);
107 }
108
109 void uh_request_done(struct client *cl)
110 {
111         uh_chunk_eof(cl);
112         uh_dispatch_done(cl);
113         memset(&cl->dispatch, 0, sizeof(cl->dispatch));
114
115         if (!conf.http_keepalive || cl->request.connection_close)
116                 return uh_connection_close(cl);
117
118         cl->state = CLIENT_STATE_INIT;
119         cl->requests++;
120         uh_poll_connection(cl);
121 }
122
123 void __printf(4, 5)
124 uh_client_error(struct client *cl, int code, const char *summary, const char *fmt, ...)
125 {
126         va_list arg;
127
128         uh_http_header(cl, code, summary);
129         ustream_printf(cl->us, "Content-Type: text/html\r\n\r\n");
130
131         uh_chunk_printf(cl, "<h1>%s</h1>", summary);
132
133         if (fmt) {
134                 va_start(arg, fmt);
135                 uh_chunk_vprintf(cl, fmt, arg);
136                 va_end(arg);
137         }
138
139         uh_request_done(cl);
140 }
141
142 static void uh_header_error(struct client *cl, int code, const char *summary)
143 {
144         uh_client_error(cl, code, summary, NULL);
145         uh_connection_close(cl);
146 }
147
148 static int find_idx(const char * const *list, int max, const char *str)
149 {
150         int i;
151
152         for (i = 0; i < max; i++)
153                 if (!strcmp(list[i], str))
154                         return i;
155
156         return -1;
157 }
158
159 static int client_parse_request(struct client *cl, char *data)
160 {
161         struct http_request *req = &cl->request;
162         char *type, *path, *version;
163         int h_method, h_version;
164
165         type = strtok(data, " ");
166         path = strtok(NULL, " ");
167         version = strtok(NULL, " ");
168         if (!type || !path || !version)
169                 return CLIENT_STATE_DONE;
170
171         blobmsg_add_string(&cl->hdr, "URL", path);
172
173         memset(&cl->request, 0, sizeof(cl->request));
174         h_method = find_idx(http_methods, ARRAY_SIZE(http_methods), type);
175         h_version = find_idx(http_versions, ARRAY_SIZE(http_versions), version);
176         if (h_method < 0 || h_version < 0) {
177                 req->version = UH_HTTP_VER_1_0;
178                 return CLIENT_STATE_DONE;
179         }
180
181         req->method = h_method;
182         req->version = h_version;
183         if (req->version < UH_HTTP_VER_1_1 || !conf.http_keepalive)
184                 req->connection_close = true;
185
186         return CLIENT_STATE_HEADER;
187 }
188
189 static bool client_init_cb(struct client *cl, char *buf, int len)
190 {
191         char *newline;
192
193         newline = strstr(buf, "\r\n");
194         if (!newline)
195                 return false;
196
197         if (newline == buf)
198                 return true;
199
200         *newline = 0;
201         blob_buf_init(&cl->hdr, 0);
202         cl->state = client_parse_request(cl, buf);
203         ustream_consume(cl->us, newline + 2 - buf);
204         if (cl->state == CLIENT_STATE_DONE)
205                 uh_header_error(cl, 400, "Bad Request");
206
207         return true;
208 }
209
210 static bool rfc1918_filter_check(struct client *cl)
211 {
212         if (!conf.rfc1918_filter)
213                 return true;
214
215         if (!uh_addr_rfc1918(&cl->peer_addr) || uh_addr_rfc1918(&cl->srv_addr))
216                 return true;
217
218         uh_client_error(cl, 403, "Forbidden",
219                         "Rejected request from RFC1918 IP "
220                         "to public server address");
221         return false;
222 }
223
224 static void client_header_complete(struct client *cl)
225 {
226         struct http_request *r = &cl->request;
227
228         if (!rfc1918_filter_check(cl))
229                 return;
230
231         if (r->expect_cont)
232                 ustream_printf(cl->us, "HTTP/1.1 100 Continue\r\n\r\n");
233
234         switch(r->ua) {
235         case UH_UA_MSIE_OLD:
236                 if (r->method != UH_HTTP_MSG_POST)
237                         break;
238
239                 /* fall through */
240         case UH_UA_SAFARI:
241                 r->connection_close = true;
242                 break;
243         default:
244                 break;
245         }
246
247         uh_handle_request(cl);
248 }
249
250 static void client_parse_header(struct client *cl, char *data)
251 {
252         struct http_request *r = &cl->request;
253         char *err;
254         char *name;
255         char *val;
256
257         if (!*data) {
258                 uloop_timeout_cancel(&cl->timeout);
259                 cl->state = CLIENT_STATE_DATA;
260                 client_header_complete(cl);
261                 return;
262         }
263
264         val = uh_split_header(data);
265         if (!val) {
266                 cl->state = CLIENT_STATE_DONE;
267                 return;
268         }
269
270         for (name = data; *name; name++)
271                 if (isupper(*name))
272                         *name = tolower(*name);
273
274         if (!strcmp(data, "expect")) {
275                 if (!strcasecmp(val, "100-continue"))
276                         r->expect_cont = true;
277                 else {
278                         uh_header_error(cl, 412, "Precondition Failed");
279                         return;
280                 }
281         } else if (!strcmp(data, "content-length")) {
282                 r->content_length = strtoul(val, &err, 0);
283                 if (err && *err) {
284                         uh_header_error(cl, 400, "Bad Request");
285                         return;
286                 }
287         } else if (!strcmp(data, "transfer-encoding")) {
288                 if (!strcmp(val, "chunked"))
289                         r->transfer_chunked = true;
290         } else if (!strcmp(data, "connection")) {
291                 if (!strcasecmp(val, "close"))
292                         r->connection_close = true;
293                 else if (!strcasecmp(val, "keep-alive"))
294                         r->connection_close = false;
295         } else if (!strcmp(data, "user-agent")) {
296                 char *str;
297
298                 if (strstr(val, "Opera"))
299                         r->ua = UH_UA_OPERA;
300                 else if ((str = strstr(val, "MSIE ")) != NULL) {
301                         r->ua = UH_UA_MSIE_NEW;
302                         if (str[5] && str[6] == '.') {
303                                 switch (str[5]) {
304                                 case '6':
305                                         if (strstr(str, "SV1"))
306                                                 break;
307                                         /* fall through */
308                                 case '5':
309                                 case '4':
310                                         r->ua = UH_UA_MSIE_OLD;
311                                         break;
312                                 }
313                         }
314                 } else if (strstr(val, "Safari/") && strstr(val, "Mac OS X"))
315                         r->ua = UH_UA_SAFARI;
316                 else if (strstr(val, "Chrome/"))
317                         r->ua = UH_UA_CHROME;
318                 else if (strstr(val, "Gecko/"))
319                         r->ua = UH_UA_GECKO;
320                 else if (strstr(val, "Konqueror"))
321                         r->ua = UH_UA_KONQUEROR;
322         }
323
324
325         blobmsg_add_string(&cl->hdr, data, val);
326
327         cl->state = CLIENT_STATE_HEADER;
328 }
329
330 void client_poll_post_data(struct client *cl)
331 {
332         struct dispatch *d = &cl->dispatch;
333         struct http_request *r = &cl->request;
334         char *buf;
335         int len;
336
337         if (cl->state == CLIENT_STATE_DONE)
338                 return;
339
340         while (1) {
341                 char *sep;
342                 int offset = 0;
343                 int cur_len;
344
345                 buf = ustream_get_read_buf(cl->us, &len);
346                 if (!buf || !len)
347                         break;
348
349                 if (!d->data_send)
350                         return;
351
352                 cur_len = min(r->content_length, len);
353                 if (cur_len) {
354                         if (d->data_blocked)
355                                 break;
356
357                         if (d->data_send)
358                                 cur_len = d->data_send(cl, buf, cur_len);
359
360                         r->content_length -= cur_len;
361                         ustream_consume(cl->us, cur_len);
362                         continue;
363                 }
364
365                 if (!r->transfer_chunked)
366                         break;
367
368                 if (r->transfer_chunked > 1)
369                         offset = 2;
370
371                 sep = strstr(buf + offset, "\r\n");
372                 if (!sep)
373                         break;
374
375                 *sep = 0;
376
377                 r->content_length = strtoul(buf + offset, &sep, 16);
378                 r->transfer_chunked++;
379                 ustream_consume(cl->us, sep + 2 - buf);
380
381                 /* invalid chunk length */
382                 if (sep && *sep) {
383                         r->content_length = 0;
384                         r->transfer_chunked = 0;
385                         break;
386                 }
387
388                 /* empty chunk == eof */
389                 if (!r->content_length) {
390                         r->transfer_chunked = false;
391                         break;
392                 }
393         }
394
395         buf = ustream_get_read_buf(cl->us, &len);
396         if (!r->content_length && !r->transfer_chunked &&
397                 cl->state != CLIENT_STATE_DONE) {
398                 if (cl->dispatch.data_done)
399                         cl->dispatch.data_done(cl);
400
401                 cl->state = CLIENT_STATE_DONE;
402         }
403 }
404
405 static bool client_data_cb(struct client *cl, char *buf, int len)
406 {
407         client_poll_post_data(cl);
408         return false;
409 }
410
411 static bool client_header_cb(struct client *cl, char *buf, int len)
412 {
413         char *newline;
414         int line_len;
415
416         newline = strstr(buf, "\r\n");
417         if (!newline)
418                 return false;
419
420         *newline = 0;
421         client_parse_header(cl, buf);
422         line_len = newline + 2 - buf;
423         ustream_consume(cl->us, line_len);
424         if (cl->state == CLIENT_STATE_DATA)
425                 return client_data_cb(cl, newline + 2, len - line_len);
426
427         return true;
428 }
429
430 typedef bool (*read_cb_t)(struct client *cl, char *buf, int len);
431 static read_cb_t read_cbs[] = {
432         [CLIENT_STATE_INIT] = client_init_cb,
433         [CLIENT_STATE_HEADER] = client_header_cb,
434         [CLIENT_STATE_DATA] = client_data_cb,
435 };
436
437 void uh_client_read_cb(struct client *cl)
438 {
439         struct ustream *us = cl->us;
440         char *str;
441         int len;
442
443         do {
444                 str = ustream_get_read_buf(us, &len);
445                 if (!str || !len)
446                         break;
447
448                 if (cl->state >= array_size(read_cbs) || !read_cbs[cl->state])
449                         break;
450
451                 if (!read_cbs[cl->state](cl, str, len)) {
452                         if (len == us->r.buffer_len &&
453                             cl->state != CLIENT_STATE_DATA)
454                                 uh_header_error(cl, 413, "Request Entity Too Large");
455                         break;
456                 }
457         } while(1);
458 }
459
460 static void client_close(struct client *cl)
461 {
462         n_clients--;
463         uh_dispatch_done(cl);
464         uloop_timeout_cancel(&cl->timeout);
465         if (cl->tls)
466                 uh_tls_client_detach(cl);
467         ustream_free(&cl->sfd.stream);
468         close(cl->sfd.fd.fd);
469         list_del(&cl->list);
470         blob_buf_free(&cl->hdr);
471         free(cl);
472
473         uh_unblock_listeners();
474 }
475
476 void uh_client_notify_state(struct client *cl)
477 {
478         struct ustream *s = cl->us;
479
480         if (!s->write_error) {
481                 if (cl->state == CLIENT_STATE_DATA)
482                         return;
483
484                 if (!s->eof || s->w.data_bytes)
485                         return;
486         }
487
488         return client_close(cl);
489 }
490
491 static void client_ustream_read_cb(struct ustream *s, int bytes)
492 {
493         struct client *cl = container_of(s, struct client, sfd.stream);
494
495         uh_client_read_cb(cl);
496 }
497
498 static void client_ustream_write_cb(struct ustream *s, int bytes)
499 {
500         struct client *cl = container_of(s, struct client, sfd.stream);
501
502         if (cl->dispatch.write_cb)
503                 cl->dispatch.write_cb(cl);
504 }
505
506 static void client_notify_state(struct ustream *s)
507 {
508         struct client *cl = container_of(s, struct client, sfd.stream);
509
510         uh_client_notify_state(cl);
511 }
512
513 static void set_addr(struct uh_addr *addr, void *src)
514 {
515         struct sockaddr_in *sin = src;
516         struct sockaddr_in6 *sin6 = src;
517
518         addr->family = sin->sin_family;
519         if (addr->family == AF_INET) {
520                 addr->port = ntohs(sin->sin_port);
521                 memcpy(&addr->in, &sin->sin_addr, sizeof(addr->in));
522         } else {
523                 addr->port = ntohs(sin6->sin6_port);
524                 memcpy(&addr->in6, &sin6->sin6_addr, sizeof(addr->in6));
525         }
526 }
527
528 bool uh_accept_client(int fd, bool tls)
529 {
530         static struct client *next_client;
531         struct client *cl;
532         unsigned int sl;
533         int sfd;
534         static int client_id = 0;
535         struct sockaddr_in6 addr;
536
537         if (!next_client)
538                 next_client = calloc(1, sizeof(*next_client));
539
540         cl = next_client;
541
542         sl = sizeof(addr);
543         sfd = accept(fd, (struct sockaddr *) &addr, &sl);
544         if (sfd < 0)
545                 return false;
546
547         set_addr(&cl->peer_addr, &addr);
548         sl = sizeof(addr);
549         getsockname(sfd, (struct sockaddr *) &addr, &sl);
550         set_addr(&cl->srv_addr, &addr);
551
552         cl->us = &cl->sfd.stream;
553         if (tls) {
554                 uh_tls_client_attach(cl);
555         } else {
556                 cl->us->notify_read = client_ustream_read_cb;
557                 cl->us->notify_write = client_ustream_write_cb;
558                 cl->us->notify_state = client_notify_state;
559         }
560
561         cl->us->string_data = true;
562         ustream_fd_init(&cl->sfd, sfd);
563
564         uh_poll_connection(cl);
565         list_add_tail(&cl->list, &clients);
566
567         next_client = NULL;
568         n_clients++;
569         cl->id = client_id++;
570
571         return true;
572 }
573
574 void uh_close_fds(void)
575 {
576         struct client *cl;
577
578         uloop_done();
579         uh_close_listen_fds();
580         list_for_each_entry(cl, &clients, list) {
581                 close(cl->sfd.fd.fd);
582                 if (cl->dispatch.close_fds)
583                         cl->dispatch.close_fds(cl);
584         }
585 }