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source: protocols/http_client.c @ fcc2da9

Last change on this file since fcc2da9 was 0602496, checked in by Wilmer van der Gaast <wilmer@…>, at 2006-05-25T11:22:06Z
Better handling of completely empty HTTP replies in http_client.c.
Property mode set to `100644`
File size: 9.4 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 void http_connected( gpointer data, int source, GaimInputCondition cond );
35	static void http_ssl_connected( gpointer data, void *source, GaimInputCondition cond );
36	static void http_incoming_data( gpointer data, int source, GaimInputCondition 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	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 void http_connected( gpointer data, int source, GaimInputCondition 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	gaim_input_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 = gaim_input_add( source,
151	req->ssl ? ssl_getdirection( req->ssl ) : GAIM_INPUT_WRITE,
152	http_connected, req );
153	else
154	req->inpa = gaim_input_add( source, GAIM_INPUT_READ, http_incoming_data, req );
155
156	return;
157
158	error:
159	req->func( req );
160
161	g_free( req->request );
162	g_free( req );
163
164	return;
165	}
166
167	static void http_ssl_connected( gpointer data, void *source, GaimInputCondition cond )
168	{
169	struct http_request *req = data;
170
171	if( source == NULL )
172	return http_connected( data, -1, cond );
173
174	req->fd = ssl_getfd( source );
175
176	return http_connected( data, req->fd, cond );
177	}
178
179	static void http_incoming_data( gpointer data, int source, GaimInputCondition cond )
180	{
181	struct http_request *req = data;
182	int evil_server = 0;
183	char buffer[2048];
184	char end1, end2;
185	int st;
186
187	if( req->inpa > 0 )
188	gaim_input_remove( req->inpa );
189
190	if( req->ssl )
191	{
192	st = ssl_read( req->ssl, buffer, sizeof( buffer ) );
193	if( st < 0 )
194	{
195	if( ssl_errno != SSL_AGAIN )
196	{
197	/* goto cleanup; */
198
199	/* YAY! We have to deal with crappy Microsoft
200	servers that LOVE to send invalid TLS
201	packets that abort connections! \o/ */
202
203	goto got_reply;
204	}
205	}
206	else if( st == 0 )
207	{
208	goto got_reply;
209	}
210	}
211	else
212	{
213	st = read( req->fd, buffer, sizeof( buffer ) );
214	if( st < 0 )
215	{
216	if( !sockerr_again() )
217	{
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 = gaim_input_add( req->fd,
236	req->ssl ? ssl_getdirection( req->ssl ) : GAIM_INPUT_READ,
237	http_incoming_data, req );
238
239	return;
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	goto cleanup;
246
247	/* Zero termination is very convenient. */
248	req->reply_headers[req->bytes_read] = 0;
249
250	/* Find the separation between headers and body, and keep stupid
251	webservers in mind. */
252	end1 = strstr( req->reply_headers, "\r\n\r\n" );
253	end2 = strstr( req->reply_headers, "\n\n" );
254
255	if( end2 && end2 < end1 )
256	{
257	end1 = end2 + 1;
258	evil_server = 1;
259	}
260	else if( end1 )
261	{
262	end1 += 2;
263	}
264	else
265	{
266	goto cleanup;
267	}
268
269	*end1 = 0;
270
271	if( evil_server )
272	req->reply_body = end1 + 1;
273	else
274	req->reply_body = end1 + 2;
275
276	req->body_size = req->reply_headers + req->bytes_read - req->reply_body;
277
278	if( ( end1 = strchr( req->reply_headers, ' ' ) ) != NULL )
279	{
280	if( sscanf( end1 + 1, "%d", &req->status_code ) != 1 )
281	req->status_code = -1;
282	}
283	else
284	{
285	req->status_code = -1;
286	}
287
288	if( req->status_code == 301 \|\| req->status_code == 302 )
289	{
290	char loc, new_request, *new_host;
291	int error = 0, new_port, new_proto;
292
293	loc = strstr( req->reply_headers, "\nLocation: " );
294	if( loc == NULL ) /* We can't handle this redirect... */
295	goto cleanup;
296
297	loc += 11;
298	while( *loc == ' ' )
299	loc ++;
300
301	/* TODO/FIXME: Possibly have to handle relative redirections,
302	and rewrite Host: headers. Not necessary for now, it's
303	enough for passport authentication like this. */
304
305	if( *loc == '/' )
306	{
307	/* Just a different pathname... */
308
309	/* Since we don't cache the servername, and since we
310	don't need this yet anyway, I won't implement it. */
311
312	goto cleanup;
313	}
314	else
315	{
316	/* A whole URL */
317	url_t *url;
318	char *s;
319
320	s = strstr( loc, "\r\n" );
321	if( s == NULL )
322	goto cleanup;
323
324	url = g_new0( url_t, 1 );
325	*s = 0;
326
327	if( !url_set( url, loc ) )
328	{
329	g_free( url );
330	goto cleanup;
331	}
332
333	/* Okay, this isn't fun! We have to rebuild the request... :-( */
334	new_request = g_malloc( req->request_length + strlen( url->file ) );
335
336	/* So, now I just allocated enough memory, so I'm
337	going to use strcat(), whether you like it or not. :-) */
338
339	/* First, find the GET/POST/whatever from the original request. */
340	s = strchr( req->request, ' ' );
341	if( s == NULL )
342	{
343	g_free( new_request );
344	g_free( url );
345	goto cleanup;
346	}
347
348	*s = 0;
349	sprintf( new_request, "%s %s HTTP/1.0\r\n", req->request, url->file );
350	*s = ' ';
351
352	s = strstr( req->request, "\r\n" );
353	if( s == NULL )
354	{
355	g_free( new_request );
356	g_free( url );
357	goto cleanup;
358	}
359
360	strcat( new_request, s + 2 );
361	new_host = g_strdup( url->host );
362	new_port = url->port;
363	new_proto = url->proto;
364
365	g_free( url );
366	}
367
368	if( req->ssl )
369	ssl_disconnect( req->ssl );
370	else
371	closesocket( req->fd );
372
373	req->fd = -1;
374	req->ssl = 0;
375
376	if( new_proto == PROTO_HTTPS )
377	{
378	req->ssl = ssl_connect( new_host, new_port, http_ssl_connected, req );
379	if( req->ssl == NULL )
380	error = 1;
381	}
382	else
383	{
384	req->fd = proxy_connect( new_host, new_port, http_connected, req );
385	if( req->fd < 0 )
386	error = 1;
387	}
388	g_free( new_host );
389
390	if( error )
391	{
392	g_free( new_request );
393	goto cleanup;
394	}
395
396	g_free( req->request );
397	g_free( req->reply_headers );
398	req->request = new_request;
399	req->request_length = strlen( new_request );
400	req->bytes_read = req->bytes_written = req->inpa = 0;
401	req->reply_headers = req->reply_body = NULL;
402
403	return;
404	}
405
406	/* Assume that a closed connection means we're finished, this indeed
407	breaks with keep-alive connections and faulty connections. */
408	req->finished = 1;
409
410	cleanup:
411	if( req->ssl )
412	ssl_disconnect( req->ssl );
413	else
414	closesocket( req->fd );
415
416	req->func( req );
417
418	g_free( req->request );
419	g_free( req->reply_headers );
420	g_free( req );
421	}

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