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source: protocols/http_client.c @ 85cf37f

Last change on this file since 85cf37f was ba9edaa, checked in by Wilmer van der Gaast <wilmer@…>, at 2006-05-10T17:34:46Z
Moved everything to the BitlBee event handling API.
Property mode set to `100644`
File size: 8.5 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	g_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	/* This one is actually pretty simple... Might get more calls if we can't write
74	the whole request at once. */
75	static gboolean http_connected( gpointer data, int source, b_input_condition cond )
76	{
77	struct http_request *req = data;
78	int st;
79
80	if( source < 0 )
81	goto error;
82
83	if( req->inpa > 0 )
84	b_event_remove( req->inpa );
85
86	sock_make_nonblocking( req->fd );
87
88	if( req->ssl )
89	{
90	st = ssl_write( req->ssl, req->request + req->bytes_written,
91	req->request_length - req->bytes_written );
92	if( st < 0 )
93	{
94	if( ssl_errno != SSL_AGAIN )
95	{
96	ssl_disconnect( req->ssl );
97	goto error;
98	}
99	}
100	}
101	else
102	{
103	st = write( source, req->request + req->bytes_written,
104	req->request_length - req->bytes_written );
105	if( st < 0 )
106	{
107	if( !sockerr_again() )
108	{
109	closesocket( req->fd );
110	goto error;
111	}
112	}
113	}
114
115	if( st > 0 )
116	req->bytes_written += st;
117
118	if( req->bytes_written < req->request_length )
119	req->inpa = b_input_add( source,
120	req->ssl ? ssl_getdirection( req->ssl ) : GAIM_INPUT_WRITE,
121	http_connected, req );
122	else
123	req->inpa = b_input_add( source, GAIM_INPUT_READ, http_incoming_data, req );
124
125	return FALSE;
126
127	error:
128	req->func( req );
129
130	g_free( req->request );
131	g_free( req );
132
133	return FALSE;
134	}
135
136	static gboolean http_ssl_connected( gpointer data, void *source, b_input_condition cond )
137	{
138	struct http_request *req = data;
139
140	if( source == NULL )
141	return http_connected( data, -1, cond );
142
143	req->fd = ssl_getfd( source );
144
145	return http_connected( data, req->fd, cond );
146	}
147
148	static gboolean http_incoming_data( gpointer data, int source, b_input_condition cond )
149	{
150	struct http_request *req = data;
151	int evil_server = 0;
152	char buffer[2048];
153	char end1, end2;
154	int st;
155
156	if( req->inpa > 0 )
157	b_event_remove( req->inpa );
158
159	if( req->ssl )
160	{
161	st = ssl_read( req->ssl, buffer, sizeof( buffer ) );
162	if( st < 0 )
163	{
164	if( ssl_errno != SSL_AGAIN )
165	{
166	/* goto cleanup; */
167
168	/* YAY! We have to deal with crappy Microsoft
169	servers that LOVE to send invalid TLS
170	packets that abort connections! \o/ */
171
172	goto got_reply;
173	}
174	}
175	else if( st == 0 )
176	{
177	goto got_reply;
178	}
179	}
180	else
181	{
182	st = read( req->fd, buffer, sizeof( buffer ) );
183	if( st < 0 )
184	{
185	if( !sockerr_again() )
186	{
187	goto cleanup;
188	}
189	}
190	else if( st == 0 )
191	{
192	goto got_reply;
193	}
194	}
195
196	if( st > 0 )
197	{
198	req->reply_headers = g_realloc( req->reply_headers, req->bytes_read + st + 1 );
199	memcpy( req->reply_headers + req->bytes_read, buffer, st );
200	req->bytes_read += st;
201	}
202
203	/* There will be more! */
204	req->inpa = b_input_add( req->fd,
205	req->ssl ? ssl_getdirection( req->ssl ) : GAIM_INPUT_READ,
206	http_incoming_data, req );
207
208	return FALSE;
209
210	got_reply:
211	/* Zero termination is very convenient. */
212	req->reply_headers[req->bytes_read] = 0;
213
214	/* Find the separation between headers and body, and keep stupid
215	webservers in mind. */
216	end1 = strstr( req->reply_headers, "\r\n\r\n" );
217	end2 = strstr( req->reply_headers, "\n\n" );
218
219	if( end2 && end2 < end1 )
220	{
221	end1 = end2 + 1;
222	evil_server = 1;
223	}
224	else
225	{
226	end1 += 2;
227	}
228
229	if( end1 )
230	{
231	*end1 = 0;
232
233	if( evil_server )
234	req->reply_body = end1 + 1;
235	else
236	req->reply_body = end1 + 2;
237	}
238
239	if( ( end1 = strchr( req->reply_headers, ' ' ) ) != NULL )
240	{
241	if( sscanf( end1 + 1, "%d", &req->status_code ) != 1 )
242	req->status_code = -1;
243	}
244	else
245	{
246	req->status_code = -1;
247	}
248
249	if( req->status_code == 301 \|\| req->status_code == 302 )
250	{
251	char loc, new_request, *new_host;
252	int error = 0, new_port, new_proto;
253
254	loc = strstr( req->reply_headers, "\nLocation: " );
255	if( loc == NULL ) /* We can't handle this redirect... */
256	goto cleanup;
257
258	loc += 11;
259	while( *loc == ' ' )
260	loc ++;
261
262	/* TODO/FIXME: Possibly have to handle relative redirections,
263	and rewrite Host: headers. Not necessary for now, it's
264	enough for passport authentication like this. */
265
266	if( *loc == '/' )
267	{
268	/* Just a different pathname... */
269
270	/* Since we don't cache the servername, and since we
271	don't need this yet anyway, I won't implement it. */
272
273	goto cleanup;
274	}
275	else
276	{
277	/* A whole URL */
278	url_t *url;
279	char *s;
280
281	s = strstr( loc, "\r\n" );
282	if( s == NULL )
283	goto cleanup;
284
285	url = g_new0( url_t, 1 );
286	*s = 0;
287
288	if( !url_set( url, loc ) )
289	{
290	g_free( url );
291	goto cleanup;
292	}
293
294	/* Okay, this isn't fun! We have to rebuild the request... :-( */
295	new_request = g_malloc( req->request_length + strlen( url->file ) );
296
297	/* So, now I just allocated enough memory, so I'm
298	going to use strcat(), whether you like it or not. :-) */
299
300	/* First, find the GET/POST/whatever from the original request. */
301	s = strchr( req->request, ' ' );
302	if( s == NULL )
303	{
304	g_free( new_request );
305	g_free( url );
306	goto cleanup;
307	}
308
309	*s = 0;
310	sprintf( new_request, "%s %s HTTP/1.0\r\n", req->request, url->file );
311	*s = ' ';
312
313	s = strstr( req->request, "\r\n" );
314	if( s == NULL )
315	{
316	g_free( new_request );
317	g_free( url );
318	goto cleanup;
319	}
320
321	strcat( new_request, s + 2 );
322	new_host = g_strdup( url->host );
323	new_port = url->port;
324	new_proto = url->proto;
325
326	g_free( url );
327	}
328
329	if( req->ssl )
330	ssl_disconnect( req->ssl );
331	else
332	closesocket( req->fd );
333
334	req->fd = -1;
335	req->ssl = 0;
336
337	if( new_proto == PROTO_HTTPS )
338	{
339	req->ssl = ssl_connect( new_host, new_port, http_ssl_connected, req );
340	if( req->ssl == NULL )
341	error = 1;
342	}
343	else
344	{
345	req->fd = proxy_connect( new_host, new_port, http_connected, req );
346	if( req->fd < 0 )
347	error = 1;
348	}
349	g_free( new_host );
350
351	if( error )
352	{
353	g_free( new_request );
354	goto cleanup;
355	}
356
357	g_free( req->request );
358	g_free( req->reply_headers );
359	req->request = new_request;
360	req->request_length = strlen( new_request );
361	req->bytes_read = req->bytes_written = req->inpa = 0;
362	req->reply_headers = req->reply_body = NULL;
363
364	return FALSE;
365	}
366
367	/* Assume that a closed connection means we're finished, this indeed
368	breaks with keep-alive connections and faulty connections. */
369	req->finished = 1;
370
371	cleanup:
372	if( req->ssl )
373	ssl_disconnect( req->ssl );
374	else
375	closesocket( req->fd );
376
377	req->func( req );
378
379	g_free( req->request );
380	g_free( req->reply_headers );
381	g_free( req );
382
383	return FALSE;
384	}

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