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source: lib/http_client.c @ 57782e4

Last change on this file since 57782e4 was 4346c3f4, checked in by Wilmer van der Gaast <wilmer@…>, at 2010-07-16T23:31:55Z
Merging mainline.
Property mode set to `100644`
File size: 10.6 KB

Line
1	/********************************************************************\
2	* BitlBee -- An IRC to other IM-networks gateway *
3	* *
4	* Copyright 2002-2005 Wilmer van der Gaast and others *
5	\********************************************************************/
6
7	/* HTTP(S) module */
8
9	/*
10	This program is free software; you can redistribute it and/or modify
11	it under the terms of the GNU General Public License as published by
12	the Free Software Foundation; either version 2 of the License, or
13	(at your option) any later version.
14
15	This program is distributed in the hope that it will be useful,
16	but WITHOUT ANY WARRANTY; without even the implied warranty of
17	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18	GNU General Public License for more details.
19
20	You should have received a copy of the GNU General Public License with
21	the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
22	if not, write to the Free Software Foundation, Inc., 59 Temple Place,
23	Suite 330, Boston, MA 02111-1307 USA
24	*/
25
26	#include <string.h>
27	#include <stdio.h>
28
29	#include "http_client.h"
30	#include "url.h"
31	#include "sock.h"
32
33
34	static gboolean http_connected( gpointer data, int source, b_input_condition cond );
35	static gboolean http_ssl_connected( gpointer data, void *source, b_input_condition cond );
36	static gboolean http_incoming_data( gpointer data, int source, b_input_condition cond );
37	static void http_free( struct http_request *req );
38
39
40	struct http_request http_dorequest( char host, int port, int ssl, char *request, http_input_function func, gpointer data )
41	{
42	struct http_request *req;
43	int error = 0;
44
45	req = g_new0( struct http_request, 1 );
46
47	if( ssl )
48	{
49	req->ssl = ssl_connect( host, port, http_ssl_connected, req );
50	if( req->ssl == NULL )
51	error = 1;
52	}
53	else
54	{
55	req->fd = proxy_connect( host, port, http_connected, req );
56	if( req->fd < 0 )
57	error = 1;
58	}
59
60	if( error )
61	{
62	http_free( req );
63	return NULL;
64	}
65
66	req->func = func;
67	req->data = data;
68	req->request = g_strdup( request );
69	req->request_length = strlen( request );
70	req->redir_ttl = 3;
71
72	return( req );
73	}
74
75	struct http_request http_dorequest_url( char url_string, http_input_function func, gpointer data )
76	{
77	url_t *url = g_new0( url_t, 1 );
78	char *request;
79	void *ret;
80
81	if( !url_set( url, url_string ) )
82	{
83	g_free( url );
84	return NULL;
85	}
86
87	if( url->proto != PROTO_HTTP && url->proto != PROTO_HTTPS )
88	{
89	g_free( url );
90	return NULL;
91	}
92
93	request = g_strdup_printf( "GET %s HTTP/1.0\r\n"
94	"Host: %s\r\n"
95	"User-Agent: BitlBee " BITLBEE_VERSION " " ARCH "/" CPU "\r\n"
96	"\r\n", url->file, url->host );
97
98	ret = http_dorequest( url->host, url->port,
99	url->proto == PROTO_HTTPS, request, func, data );
100
101	g_free( url );
102	g_free( request );
103	return ret;
104	}
105
106	/* This one is actually pretty simple... Might get more calls if we can't write
107	the whole request at once. */
108	static gboolean http_connected( gpointer data, int source, b_input_condition cond )
109	{
110	struct http_request *req = data;
111	int st;
112
113	if( source < 0 )
114	goto error;
115
116	if( req->inpa > 0 )
117	b_event_remove( req->inpa );
118
119	sock_make_nonblocking( req->fd );
120
121	if( req->ssl )
122	{
123	st = ssl_write( req->ssl, req->request + req->bytes_written,
124	req->request_length - req->bytes_written );
125	if( st < 0 )
126	{
127	if( ssl_errno != SSL_AGAIN )
128	{
129	ssl_disconnect( req->ssl );
130	goto error;
131	}
132	}
133	}
134	else
135	{
136	st = write( source, req->request + req->bytes_written,
137	req->request_length - req->bytes_written );
138	if( st < 0 )
139	{
140	if( !sockerr_again() )
141	{
142	closesocket( req->fd );
143	goto error;
144	}
145	}
146	}
147
148	if( st > 0 )
149	req->bytes_written += st;
150
151	if( req->bytes_written < req->request_length )
152	req->inpa = b_input_add( source,
153	req->ssl ? ssl_getdirection( req->ssl ) : B_EV_IO_WRITE,
154	http_connected, req );
155	else
156	req->inpa = b_input_add( source, B_EV_IO_READ, http_incoming_data, req );
157
158	return FALSE;
159
160	error:
161	req->status_string = g_strdup( "Error while writing HTTP request" );
162
163	req->func( req );
164	http_free( req );
165	return FALSE;
166	}
167
168	static gboolean http_ssl_connected( gpointer data, void *source, b_input_condition cond )
169	{
170	struct http_request *req = data;
171
172	if( source == NULL )
173	return http_connected( data, -1, cond );
174
175	req->fd = ssl_getfd( source );
176
177	return http_connected( data, req->fd, cond );
178	}
179
180	static gboolean http_incoming_data( gpointer data, int source, b_input_condition cond )
181	{
182	struct http_request *req = data;
183	int evil_server = 0;
184	char buffer[2048];
185	char end1, end2;
186	int st;
187
188	if( req->inpa > 0 )
189	b_event_remove( req->inpa );
190
191	if( req->ssl )
192	{
193	st = ssl_read( req->ssl, buffer, sizeof( buffer ) );
194	if( st < 0 )
195	{
196	if( ssl_errno != SSL_AGAIN )
197	{
198	/* goto cleanup; */
199
200	/* YAY! We have to deal with crappy Microsoft
201	servers that LOVE to send invalid TLS
202	packets that abort connections! \o/ */
203
204	goto got_reply;
205	}
206	}
207	else if( st == 0 )
208	{
209	goto got_reply;
210	}
211	}
212	else
213	{
214	st = read( req->fd, buffer, sizeof( buffer ) );
215	if( st < 0 )
216	{
217	if( !sockerr_again() )
218	{
219	req->status_string = g_strdup( strerror( errno ) );
220	goto cleanup;
221	}
222	}
223	else if( st == 0 )
224	{
225	goto got_reply;
226	}
227	}
228
229	if( st > 0 )
230	{
231	req->reply_headers = g_realloc( req->reply_headers, req->bytes_read + st + 1 );
232	memcpy( req->reply_headers + req->bytes_read, buffer, st );
233	req->bytes_read += st;
234	}
235
236	/* There will be more! */
237	req->inpa = b_input_add( req->fd,
238	req->ssl ? ssl_getdirection( req->ssl ) : B_EV_IO_READ,
239	http_incoming_data, req );
240
241	return FALSE;
242
243	got_reply:
244	/* Maybe if the webserver is overloaded, or when there's bad SSL
245	support... */
246	if( req->bytes_read == 0 )
247	{
248	req->status_string = g_strdup( "Empty HTTP reply" );
249	goto cleanup;
250	}
251
252	/* Zero termination is very convenient. */
253	req->reply_headers[req->bytes_read] = 0;
254
255	/* Find the separation between headers and body, and keep stupid
256	webservers in mind. */
257	end1 = strstr( req->reply_headers, "\r\n\r\n" );
258	end2 = strstr( req->reply_headers, "\n\n" );
259
260	if( end2 && end2 < end1 )
261	{
262	end1 = end2 + 1;
263	evil_server = 1;
264	}
265	else if( end1 )
266	{
267	end1 += 2;
268	}
269	else
270	{
271	req->status_string = g_strdup( "Malformed HTTP reply" );
272	goto cleanup;
273	}
274
275	*end1 = 0;
276
277	if( evil_server )
278	req->reply_body = end1 + 1;
279	else
280	req->reply_body = end1 + 2;
281
282	req->body_size = req->reply_headers + req->bytes_read - req->reply_body;
283
284	if( ( end1 = strchr( req->reply_headers, ' ' ) ) != NULL )
285	{
286	if( sscanf( end1 + 1, "%d", &req->status_code ) != 1 )
287	{
288	req->status_string = g_strdup( "Can't parse status code" );
289	req->status_code = -1;
290	}
291	else
292	{
293	char *eol;
294
295	if( evil_server )
296	eol = strchr( end1, '\n' );
297	else
298	eol = strchr( end1, '\r' );
299
300	req->status_string = g_strndup( end1 + 1, eol - end1 - 1 );
301
302	/* Just to be sure... */
303	if( ( eol = strchr( req->status_string, '\r' ) ) )
304	*eol = 0;
305	if( ( eol = strchr( req->status_string, '\n' ) ) )
306	*eol = 0;
307	}
308	}
309	else
310	{
311	req->status_string = g_strdup( "Can't locate status code" );
312	req->status_code = -1;
313	}
314
315	if( ( req->status_code == 301 \|\| req->status_code == 302 ) && req->redir_ttl-- > 0 )
316	{
317	char loc, new_request, *new_host;
318	int error = 0, new_port, new_proto;
319
320	/* We might fill it again, so let's not leak any memory. */
321	g_free( req->status_string );
322	req->status_string = NULL;
323
324	loc = strstr( req->reply_headers, "\nLocation: " );
325	if( loc == NULL ) /* We can't handle this redirect... */
326	{
327	req->status_string = g_strdup( "Can't locate Location: header" );
328	goto cleanup;
329	}
330
331	loc += 11;
332	while( *loc == ' ' )
333	loc ++;
334
335	/* TODO/FIXME: Possibly have to handle relative redirections,
336	and rewrite Host: headers. Not necessary for now, it's
337	enough for passport authentication like this. */
338
339	if( *loc == '/' )
340	{
341	/* Just a different pathname... */
342
343	/* Since we don't cache the servername, and since we
344	don't need this yet anyway, I won't implement it. */
345
346	req->status_string = g_strdup( "Can't handle recursive redirects" );
347
348	goto cleanup;
349	}
350	else
351	{
352	/* A whole URL */
353	url_t *url;
354	char *s;
355
356	s = strstr( loc, "\r\n" );
357	if( s == NULL )
358	goto cleanup;
359
360	url = g_new0( url_t, 1 );
361	*s = 0;
362
363	if( !url_set( url, loc ) )
364	{
365	req->status_string = g_strdup( "Malformed redirect URL" );
366	g_free( url );
367	goto cleanup;
368	}
369
370	/* Okay, this isn't fun! We have to rebuild the request... :-( */
371	new_request = g_malloc( req->request_length + strlen( url->file ) );
372
373	/* So, now I just allocated enough memory, so I'm
374	going to use strcat(), whether you like it or not. :-) */
375
376	sprintf( new_request, "GET %s HTTP/1.0", url->file );
377
378	s = strstr( req->request, "\r\n" );
379	if( s == NULL )
380	{
381	req->status_string = g_strdup( "Error while rebuilding request string" );
382	g_free( new_request );
383	g_free( url );
384	goto cleanup;
385	}
386
387	strcat( new_request, s );
388	new_host = g_strdup( url->host );
389	new_port = url->port;
390	new_proto = url->proto;
391
392	g_free( url );
393	}
394
395	if( req->ssl )
396	ssl_disconnect( req->ssl );
397	else
398	closesocket( req->fd );
399
400	req->fd = -1;
401	req->ssl = NULL;
402
403	if( new_proto == PROTO_HTTPS )
404	{
405	req->ssl = ssl_connect( new_host, new_port, http_ssl_connected, req );
406	if( req->ssl == NULL )
407	error = 1;
408	}
409	else
410	{
411	req->fd = proxy_connect( new_host, new_port, http_connected, req );
412	if( req->fd < 0 )
413	error = 1;
414	}
415	g_free( new_host );
416
417	if( error )
418	{
419	req->status_string = g_strdup( "Connection problem during redirect" );
420	g_free( new_request );
421	goto cleanup;
422	}
423
424	g_free( req->request );
425	g_free( req->reply_headers );
426	req->request = new_request;
427	req->request_length = strlen( new_request );
428	req->bytes_read = req->bytes_written = req->inpa = 0;
429	req->reply_headers = req->reply_body = NULL;
430
431	return FALSE;
432	}
433
434	/* Assume that a closed connection means we're finished, this indeed
435	breaks with keep-alive connections and faulty connections. */
436	req->finished = 1;
437
438	cleanup:
439	if( req->ssl )
440	ssl_disconnect( req->ssl );
441	else
442	closesocket( req->fd );
443
444	req->func( req );
445	http_free( req );
446	return FALSE;
447	}
448
449	static void http_free( struct http_request *req )
450	{
451	g_free( req->request );
452	g_free( req->reply_headers );
453	g_free( req->status_string );
454	g_free( req );
455	}
456

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