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source: lib/http_client.c @ a670aeb

Last change on this file since a670aeb was e046390, checked in by Wilmer van der Gaast <wilmer@…>, at 2009-10-10T23:25:54Z

Make purple use BitlBee's event handling API. Since the APIs never really
diverged too much this is fairly transparent. I did rename and redefine
GAIM_INPUT_* variables to really make it work without adding another stupid
layer in between.

One problem left, the new libpurple input API doesn't care about return
values. Fixing that in the next CL.

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 ) : B_EV_IO_WRITE,
152	http_connected, req );
153	else
154	req->inpa = b_input_add( source, B_EV_IO_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 ) : B_EV_IO_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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