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source: lib/http_client.c @ 36cf9fd

Last change on this file since 36cf9fd was fb98634, checked in by Wilmer van der Gaast <wilmer@…>, at 2008-09-28T13:09:36Z
Fixed crappy memory management in http_client.
Property mode set to `100644`
File size: 10.4 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
38
39	void http_dorequest( char host, int port, int ssl, char *request, http_input_function func, gpointer data )
40	{
41	struct http_request *req;
42	int error = 0;
43
44	req = g_new0( struct http_request, 1 );
45
46	if( ssl )
47	{
48	req->ssl = ssl_connect( host, port, http_ssl_connected, req );
49	if( req->ssl == NULL )
50	error = 1;
51	}
52	else
53	{
54	req->fd = proxy_connect( host, port, http_connected, req );
55	if( req->fd < 0 )
56	error = 1;
57	}
58
59	if( error )
60	{
61	http_free( req );
62	return NULL;
63	}
64
65	req->func = func;
66	req->data = data;
67	req->request = g_strdup( request );
68	req->request_length = strlen( request );
69
70	return( req );
71	}
72
73	void http_dorequest_url( char url_string, http_input_function func, gpointer data )
74	{
75	url_t *url = g_new0( url_t, 1 );
76	char *request;
77	void *ret;
78
79	if( !url_set( url, url_string ) )
80	{
81	g_free( url );
82	return NULL;
83	}
84
85	if( url->proto != PROTO_HTTP && url->proto != PROTO_HTTPS )
86	{
87	g_free( url );
88	return NULL;
89	}
90
91	request = g_strdup_printf( "GET %s HTTP/1.0\r\n"
92	"Host: %s\r\n"
93	"User-Agent: BitlBee " BITLBEE_VERSION " " ARCH "/" CPU "\r\n"
94	"\r\n", url->file, url->host );
95
96	ret = http_dorequest( url->host, url->port,
97	url->proto == PROTO_HTTPS, request, func, data );
98
99	g_free( url );
100	g_free( request );
101	return ret;
102	}
103
104	/* This one is actually pretty simple... Might get more calls if we can't write
105	the whole request at once. */
106	static gboolean http_connected( gpointer data, int source, b_input_condition cond )
107	{
108	struct http_request *req = data;
109	int st;
110
111	if( source < 0 )
112	goto error;
113
114	if( req->inpa > 0 )
115	b_event_remove( req->inpa );
116
117	sock_make_nonblocking( req->fd );
118
119	if( req->ssl )
120	{
121	st = ssl_write( req->ssl, req->request + req->bytes_written,
122	req->request_length - req->bytes_written );
123	if( st < 0 )
124	{
125	if( ssl_errno != SSL_AGAIN )
126	{
127	ssl_disconnect( req->ssl );
128	goto error;
129	}
130	}
131	}
132	else
133	{
134	st = write( source, req->request + req->bytes_written,
135	req->request_length - req->bytes_written );
136	if( st < 0 )
137	{
138	if( !sockerr_again() )
139	{
140	closesocket( req->fd );
141	goto error;
142	}
143	}
144	}
145
146	if( st > 0 )
147	req->bytes_written += st;
148
149	if( req->bytes_written < req->request_length )
150	req->inpa = b_input_add( source,
151	req->ssl ? ssl_getdirection( req->ssl ) : GAIM_INPUT_WRITE,
152	http_connected, req );
153	else
154	req->inpa = b_input_add( source, GAIM_INPUT_READ, http_incoming_data, req );
155
156	return FALSE;
157
158	error:
159	req->status_string = g_strdup( "Error while writing HTTP request" );
160
161	req->func( req );
162	http_free( req );
163	return FALSE;
164	}
165
166	static gboolean http_ssl_connected( gpointer data, void *source, b_input_condition cond )
167	{
168	struct http_request *req = data;
169
170	if( source == NULL )
171	return http_connected( data, -1, cond );
172
173	req->fd = ssl_getfd( source );
174
175	return http_connected( data, req->fd, cond );
176	}
177
178	static gboolean http_incoming_data( gpointer data, int source, b_input_condition cond )
179	{
180	struct http_request *req = data;
181	int evil_server = 0;
182	char buffer[2048];
183	char end1, end2;
184	int st;
185
186	if( req->inpa > 0 )
187	b_event_remove( req->inpa );
188
189	if( req->ssl )
190	{
191	st = ssl_read( req->ssl, buffer, sizeof( buffer ) );
192	if( st < 0 )
193	{
194	if( ssl_errno != SSL_AGAIN )
195	{
196	/* goto cleanup; */
197
198	/* YAY! We have to deal with crappy Microsoft
199	servers that LOVE to send invalid TLS
200	packets that abort connections! \o/ */
201
202	goto got_reply;
203	}
204	}
205	else if( st == 0 )
206	{
207	goto got_reply;
208	}
209	}
210	else
211	{
212	st = read( req->fd, buffer, sizeof( buffer ) );
213	if( st < 0 )
214	{
215	if( !sockerr_again() )
216	{
217	req->status_string = g_strdup( strerror( errno ) );
218	goto cleanup;
219	}
220	}
221	else if( st == 0 )
222	{
223	goto got_reply;
224	}
225	}
226
227	if( st > 0 )
228	{
229	req->reply_headers = g_realloc( req->reply_headers, req->bytes_read + st + 1 );
230	memcpy( req->reply_headers + req->bytes_read, buffer, st );
231	req->bytes_read += st;
232	}
233
234	/* There will be more! */
235	req->inpa = b_input_add( req->fd,
236	req->ssl ? ssl_getdirection( req->ssl ) : GAIM_INPUT_READ,
237	http_incoming_data, req );
238
239	return FALSE;
240
241	got_reply:
242	/* Maybe if the webserver is overloaded, or when there's bad SSL
243	support... */
244	if( req->bytes_read == 0 )
245	{
246	req->status_string = g_strdup( "Empty HTTP reply" );
247	goto cleanup;
248	}
249
250	/* Zero termination is very convenient. */
251	req->reply_headers[req->bytes_read] = 0;
252
253	/* Find the separation between headers and body, and keep stupid
254	webservers in mind. */
255	end1 = strstr( req->reply_headers, "\r\n\r\n" );
256	end2 = strstr( req->reply_headers, "\n\n" );
257
258	if( end2 && end2 < end1 )
259	{
260	end1 = end2 + 1;
261	evil_server = 1;
262	}
263	else if( end1 )
264	{
265	end1 += 2;
266	}
267	else
268	{
269	req->status_string = g_strdup( "Malformed HTTP reply" );
270	goto cleanup;
271	}
272
273	*end1 = 0;
274
275	if( evil_server )
276	req->reply_body = end1 + 1;
277	else
278	req->reply_body = end1 + 2;
279
280	req->body_size = req->reply_headers + req->bytes_read - req->reply_body;
281
282	if( ( end1 = strchr( req->reply_headers, ' ' ) ) != NULL )
283	{
284	if( sscanf( end1 + 1, "%d", &req->status_code ) != 1 )
285	{
286	req->status_string = g_strdup( "Can't parse status code" );
287	req->status_code = -1;
288	}
289	else
290	{
291	char *eol;
292
293	if( evil_server )
294	eol = strchr( end1, '\n' );
295	else
296	eol = strchr( end1, '\r' );
297
298	req->status_string = g_strndup( end1 + 1, eol - end1 - 1 );
299
300	/* Just to be sure... */
301	if( ( eol = strchr( req->status_string, '\r' ) ) )
302	*eol = 0;
303	if( ( eol = strchr( req->status_string, '\n' ) ) )
304	*eol = 0;
305	}
306	}
307	else
308	{
309	req->status_string = g_strdup( "Can't locate status code" );
310	req->status_code = -1;
311	}
312
313	if( req->status_code == 301 \|\| req->status_code == 302 )
314	{
315	char loc, new_request, *new_host;
316	int error = 0, new_port, new_proto;
317
318	/* We might fill it again, so let's not leak any memory. */
319	g_free( req->status_string );
320	req->status_string = NULL;
321
322	loc = strstr( req->reply_headers, "\nLocation: " );
323	if( loc == NULL ) /* We can't handle this redirect... */
324	{
325	req->status_string = g_strdup( "Can't locate Location: header" );
326	goto cleanup;
327	}
328
329	loc += 11;
330	while( *loc == ' ' )
331	loc ++;
332
333	/* TODO/FIXME: Possibly have to handle relative redirections,
334	and rewrite Host: headers. Not necessary for now, it's
335	enough for passport authentication like this. */
336
337	if( *loc == '/' )
338	{
339	/* Just a different pathname... */
340
341	/* Since we don't cache the servername, and since we
342	don't need this yet anyway, I won't implement it. */
343
344	req->status_string = g_strdup( "Can't handle recursive redirects" );
345
346	goto cleanup;
347	}
348	else
349	{
350	/* A whole URL */
351	url_t *url;
352	char *s;
353
354	s = strstr( loc, "\r\n" );
355	if( s == NULL )
356	goto cleanup;
357
358	url = g_new0( url_t, 1 );
359	*s = 0;
360
361	if( !url_set( url, loc ) )
362	{
363	req->status_string = g_strdup( "Malformed redirect URL" );
364	g_free( url );
365	goto cleanup;
366	}
367
368	/* Okay, this isn't fun! We have to rebuild the request... :-( */
369	new_request = g_malloc( req->request_length + strlen( url->file ) );
370
371	/* So, now I just allocated enough memory, so I'm
372	going to use strcat(), whether you like it or not. :-) */
373
374	sprintf( new_request, "GET %s HTTP/1.0", url->file );
375
376	s = strstr( req->request, "\r\n" );
377	if( s == NULL )
378	{
379	req->status_string = g_strdup( "Error while rebuilding request string" );
380	g_free( new_request );
381	g_free( url );
382	goto cleanup;
383	}
384
385	strcat( new_request, s );
386	new_host = g_strdup( url->host );
387	new_port = url->port;
388	new_proto = url->proto;
389
390	g_free( url );
391	}
392
393	if( req->ssl )
394	ssl_disconnect( req->ssl );
395	else
396	closesocket( req->fd );
397
398	req->fd = -1;
399	req->ssl = NULL;
400
401	if( new_proto == PROTO_HTTPS )
402	{
403	req->ssl = ssl_connect( new_host, new_port, http_ssl_connected, req );
404	if( req->ssl == NULL )
405	error = 1;
406	}
407	else
408	{
409	req->fd = proxy_connect( new_host, new_port, http_connected, req );
410	if( req->fd < 0 )
411	error = 1;
412	}
413	g_free( new_host );
414
415	if( error )
416	{
417	req->status_string = g_strdup( "Connection problem during redirect" );
418	g_free( new_request );
419	goto cleanup;
420	}
421
422	g_free( req->request );
423	g_free( req->reply_headers );
424	req->request = new_request;
425	req->request_length = strlen( new_request );
426	req->bytes_read = req->bytes_written = req->inpa = 0;
427	req->reply_headers = req->reply_body = NULL;
428
429	return FALSE;
430	}
431
432	/* Assume that a closed connection means we're finished, this indeed
433	breaks with keep-alive connections and faulty connections. */
434	req->finished = 1;
435
436	cleanup:
437	if( req->ssl )
438	ssl_disconnect( req->ssl );
439	else
440	closesocket( req->fd );
441
442	req->func( req );
443	http_free( req );
444	return FALSE;
445	}
446
447	void http_free( struct http_request *req )
448	{
449	g_free( req->request );
450	g_free( req->reply_headers );
451	g_free( req->status_string );
452	g_free( req );
453	}
454

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