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source: protocols/proxy.c @ 34759e6

Last change on this file since 34759e6 was c3ffa45, checked in by Jelmer Vernooij <jelmer@…>, at 2005-12-06T21:55:09Z
Add some const
Property mode set to `100644`
File size: 14.1 KB

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1	/*
2	* gaim
3	*
4	* Copyright (C) 1998-1999, Mark Spencer <markster@marko.net>
5	* Copyright (C) 2002-2004, Wilmer van der Gaast, Jelmer Vernooij
6	*
7	* This program is free software; you can redistribute it and/or modify
8	* it under the terms of the GNU General Public License as published by
9	* the Free Software Foundation; either version 2 of the License, or
10	* (at your option) any later version.
11	*
12	* This program is distributed in the hope that it will be useful,
13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15	* GNU General Public License for more details.
16	*
17	* You should have received a copy of the GNU General Public License
18	* along with this program; if not, write to the Free Software
19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20	*
21	*/
22
23	/* this is a little piece of code to handle proxy connection */
24	/* it is intended to : 1st handle http proxy, using the CONNECT command
25	, 2nd provide an easy way to add socks support */
26
27	#define BITLBEE_CORE
28	#include <stdio.h>
29	#include <stdlib.h>
30	#include <string.h>
31	#include <sys/types.h>
32	#ifndef _WIN32
33	#include <sys/socket.h>
34	#include <netdb.h>
35	#include <netinet/in.h>
36	#include <arpa/inet.h>
37	#include <unistd.h>
38	#else
39	#include "sock.h"
40	#define ETIMEDOUT WSAETIMEDOUT
41	#define EINPROGRESS WSAEINPROGRESS
42	#endif
43	#include <fcntl.h>
44	#include <errno.h>
45	#include "nogaim.h"
46	#include "proxy.h"
47
48	#define GAIM_READ_COND (G_IO_IN \| G_IO_HUP \| G_IO_ERR)
49	#define GAIM_WRITE_COND (G_IO_OUT \| G_IO_HUP \| G_IO_ERR \| G_IO_NVAL)
50	#define GAIM_ERR_COND (G_IO_HUP \| G_IO_ERR \| G_IO_NVAL)
51
52	char proxyhost[128] = "";
53	int proxyport = 0;
54	int proxytype = PROXY_NONE;
55	char proxyuser[128] = "";
56	char proxypass[128] = "";
57
58	struct PHB {
59	GaimInputFunction func, proxy_func;
60	gpointer data, proxy_data;
61	char *host;
62	int port;
63	int fd;
64	gint inpa;
65	};
66
67	typedef struct _GaimIOClosure {
68	GaimInputFunction function;
69	guint result;
70	gpointer data;
71	} GaimIOClosure;
72
73
74
75	static struct sockaddr_in gaim_gethostbyname(const char host, int port)
76	{
77	static struct sockaddr_in sin;
78
79	if (!inet_aton(host, &sin.sin_addr)) {
80	struct hostent *hp;
81	if (!(hp = gethostbyname(host))) {
82	return NULL;
83	}
84	memset(&sin, 0, sizeof(struct sockaddr_in));
85	memcpy(&sin.sin_addr.s_addr, hp->h_addr, hp->h_length);
86	sin.sin_family = hp->h_addrtype;
87	} else
88	sin.sin_family = AF_INET;
89	sin.sin_port = htons(port);
90
91	return &sin;
92	}
93
94	static void gaim_io_destroy(gpointer data)
95	{
96	g_free(data);
97	}
98
99	static gboolean gaim_io_invoke(GIOChannel *source, GIOCondition condition, gpointer data)
100	{
101	GaimIOClosure *closure = data;
102	GaimInputCondition gaim_cond = 0;
103
104	if (condition & GAIM_READ_COND)
105	gaim_cond \|= GAIM_INPUT_READ;
106	if (condition & GAIM_WRITE_COND)
107	gaim_cond \|= GAIM_INPUT_WRITE;
108	// if (condition & GAIM_ERR_COND)
109	// fprintf( stderr, "ERROR! fd=%d\n", g_io_channel_unix_get_fd( source ) );
110
111	closure->function(closure->data, g_io_channel_unix_get_fd(source), gaim_cond);
112
113	return TRUE;
114	}
115
116	static void gaim_io_connected(gpointer data, gint source, GaimInputCondition cond)
117	{
118	struct PHB *phb = data;
119	unsigned int len;
120	int error = ETIMEDOUT;
121	len = sizeof(error);
122
123	#ifndef _WIN32
124	if (getsockopt(source, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
125	closesocket(source);
126	gaim_input_remove(phb->inpa);
127	if( phb->proxy_func )
128	phb->proxy_func(phb->proxy_data, -1, GAIM_INPUT_READ);
129	else {
130	phb->func(phb->data, -1, GAIM_INPUT_READ);
131	g_free(phb);
132	}
133	return;
134	}
135	fcntl(source, F_SETFL, 0);
136	#endif
137	gaim_input_remove(phb->inpa);
138	if( phb->proxy_func )
139	phb->proxy_func(phb->proxy_data, source, GAIM_INPUT_READ);
140	else {
141	phb->func(phb->data, source, GAIM_INPUT_READ);
142	g_free(phb);
143	}
144	}
145
146	static int proxy_connect_none(const char host, unsigned short port, struct PHB phb)
147	{
148	struct sockaddr_in *sin;
149	int fd = -1;
150
151	if (!(sin = gaim_gethostbyname(host, port))) {
152	g_free(phb);
153	return -1;
154	}
155
156	if ((fd = socket(sin->sin_family, SOCK_STREAM, 0)) < 0) {
157	g_free(phb);
158	return -1;
159	}
160
161	sock_make_nonblocking(fd);
162
163	if (connect(fd, (struct sockaddr )sin, sizeof(sin)) < 0) {
164	if (sockerr_again()) {
165	phb->inpa = gaim_input_add(fd, GAIM_INPUT_WRITE, gaim_io_connected, phb);
166	phb->fd = fd;
167	} else {
168	closesocket(fd);
169	g_free(phb);
170	return -1;
171	}
172	}
173
174	return fd;
175	}
176
177
178	/* Connecting to HTTP proxies */
179
180	#define HTTP_GOODSTRING "HTTP/1.0 200 Connection established"
181	#define HTTP_GOODSTRING2 "HTTP/1.1 200 Connection established"
182
183	static void http_canread(gpointer data, gint source, GaimInputCondition cond)
184	{
185	int nlc = 0;
186	int pos = 0;
187	struct PHB *phb = data;
188	char inputline[8192];
189
190	gaim_input_remove(phb->inpa);
191
192	while ((pos < sizeof(inputline)-1) && (nlc != 2) && (read(source, &inputline[pos++], 1) == 1)) {
193	if (inputline[pos - 1] == '\n')
194	nlc++;
195	else if (inputline[pos - 1] != '\r')
196	nlc = 0;
197	}
198	inputline[pos] = '\0';
199
200	if ((memcmp(HTTP_GOODSTRING, inputline, strlen(HTTP_GOODSTRING)) == 0) \|\|
201	(memcmp(HTTP_GOODSTRING2, inputline, strlen(HTTP_GOODSTRING2)) == 0)) {
202	phb->func(phb->data, source, GAIM_INPUT_READ);
203	g_free(phb->host);
204	g_free(phb);
205	return;
206	}
207
208	close(source);
209	phb->func(phb->data, -1, GAIM_INPUT_READ);
210	g_free(phb->host);
211	g_free(phb);
212	return;
213	}
214
215	static void http_canwrite(gpointer data, gint source, GaimInputCondition cond)
216	{
217	char cmd[384];
218	struct PHB *phb = data;
219	unsigned int len;
220	int error = ETIMEDOUT;
221	if (phb->inpa > 0)
222	gaim_input_remove(phb->inpa);
223	len = sizeof(error);
224	if (getsockopt(source, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
225	close(source);
226	phb->func(phb->data, -1, GAIM_INPUT_READ);
227	g_free(phb->host);
228	g_free(phb);
229	return;
230	}
231	#ifdef F_SETFL
232	fcntl(source, F_SETFL, 0);
233	#endif
234
235	g_snprintf(cmd, sizeof(cmd), "CONNECT %s:%d HTTP/1.1\r\nHost: %s:%d\r\n", phb->host, phb->port,
236	phb->host, phb->port);
237	if (send(source, cmd, strlen(cmd), 0) < 0) {
238	close(source);
239	phb->func(phb->data, -1, GAIM_INPUT_READ);
240	g_free(phb->host);
241	g_free(phb);
242	return;
243	}
244
245	if (proxyuser && *proxyuser) {
246	char t1, t2;
247	t1 = g_strdup_printf("%s:%s", proxyuser, proxypass);
248	t2 = tobase64(t1);
249	g_free(t1);
250	g_snprintf(cmd, sizeof(cmd), "Proxy-Authorization: Basic %s\r\n", t2);
251	g_free(t2);
252	if (send(source, cmd, strlen(cmd), 0) < 0) {
253	close(source);
254	phb->func(phb->data, -1, GAIM_INPUT_READ);
255	g_free(phb->host);
256	g_free(phb);
257	return;
258	}
259	}
260
261	g_snprintf(cmd, sizeof(cmd), "\r\n");
262	if (send(source, cmd, strlen(cmd), 0) < 0) {
263	close(source);
264	phb->func(phb->data, -1, GAIM_INPUT_READ);
265	g_free(phb->host);
266	g_free(phb);
267	return;
268	}
269
270	phb->inpa = gaim_input_add(source, GAIM_INPUT_READ, http_canread, phb);
271	}
272
273	static int proxy_connect_http(const char host, unsigned short port, struct PHB phb)
274	{
275	phb->host = g_strdup(host);
276	phb->port = port;
277	phb->proxy_func = http_canwrite;
278	phb->proxy_data = phb;
279
280	return( proxy_connect_none( proxyhost, proxyport, phb ) );
281	}
282
283
284	/* Connecting to SOCKS4 proxies */
285
286	static void s4_canread(gpointer data, gint source, GaimInputCondition cond)
287	{
288	unsigned char packet[12];
289	struct PHB *phb = data;
290
291	gaim_input_remove(phb->inpa);
292
293	memset(packet, 0, sizeof(packet));
294	if (read(source, packet, 9) >= 4 && packet[1] == 90) {
295	phb->func(phb->data, source, GAIM_INPUT_READ);
296	g_free(phb->host);
297	g_free(phb);
298	return;
299	}
300
301	close(source);
302	phb->func(phb->data, -1, GAIM_INPUT_READ);
303	g_free(phb->host);
304	g_free(phb);
305	}
306
307	static void s4_canwrite(gpointer data, gint source, GaimInputCondition cond)
308	{
309	unsigned char packet[12];
310	struct hostent *hp;
311	struct PHB *phb = data;
312	unsigned int len;
313	int error = ETIMEDOUT;
314	if (phb->inpa > 0)
315	gaim_input_remove(phb->inpa);
316	len = sizeof(error);
317	if (getsockopt(source, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
318	close(source);
319	phb->func(phb->data, -1, GAIM_INPUT_READ);
320	g_free(phb->host);
321	g_free(phb);
322	return;
323	}
324	#ifdef F_SETFL
325	fcntl(source, F_SETFL, 0);
326	#endif
327
328	/* XXX does socks4 not support host name lookups by the proxy? */
329	if (!(hp = gethostbyname(phb->host))) {
330	close(source);
331	phb->func(phb->data, -1, GAIM_INPUT_READ);
332	g_free(phb->host);
333	g_free(phb);
334	return;
335	}
336
337	packet[0] = 4;
338	packet[1] = 1;
339	packet[2] = phb->port >> 8;
340	packet[3] = phb->port & 0xff;
341	packet[4] = (unsigned char)(hp->h_addr_list[0])[0];
342	packet[5] = (unsigned char)(hp->h_addr_list[0])[1];
343	packet[6] = (unsigned char)(hp->h_addr_list[0])[2];
344	packet[7] = (unsigned char)(hp->h_addr_list[0])[3];
345	packet[8] = 0;
346	if (write(source, packet, 9) != 9) {
347	close(source);
348	phb->func(phb->data, -1, GAIM_INPUT_READ);
349	g_free(phb->host);
350	g_free(phb);
351	return;
352	}
353
354	phb->inpa = gaim_input_add(source, GAIM_INPUT_READ, s4_canread, phb);
355	}
356
357	static int proxy_connect_socks4(const char host, unsigned short port, struct PHB phb)
358	{
359	phb->host = g_strdup(host);
360	phb->port = port;
361	phb->proxy_func = s4_canwrite;
362	phb->proxy_data = phb;
363
364	return( proxy_connect_none( proxyhost, proxyport, phb ) );
365	}
366
367
368	/* Connecting to SOCKS5 proxies */
369
370	static void s5_canread_again(gpointer data, gint source, GaimInputCondition cond)
371	{
372	unsigned char buf[512];
373	struct PHB *phb = data;
374
375	gaim_input_remove(phb->inpa);
376
377	if (read(source, buf, 10) < 10) {
378	close(source);
379	phb->func(phb->data, -1, GAIM_INPUT_READ);
380	g_free(phb->host);
381	g_free(phb);
382	return;
383	}
384	if ((buf[0] != 0x05) \|\| (buf[1] != 0x00)) {
385	close(source);
386	phb->func(phb->data, -1, GAIM_INPUT_READ);
387	g_free(phb->host);
388	g_free(phb);
389	return;
390	}
391
392	phb->func(phb->data, source, GAIM_INPUT_READ);
393	g_free(phb->host);
394	g_free(phb);
395	return;
396	}
397
398	static void s5_sendconnect(gpointer data, gint source)
399	{
400	unsigned char buf[512];
401	struct PHB *phb = data;
402	int hlen = strlen(phb->host);
403
404	buf[0] = 0x05;
405	buf[1] = 0x01; /* CONNECT */
406	buf[2] = 0x00; /* reserved */
407	buf[3] = 0x03; /* address type -- host name */
408	buf[4] = hlen;
409	memcpy(buf + 5, phb->host, hlen);
410	buf[5 + strlen(phb->host)] = phb->port >> 8;
411	buf[5 + strlen(phb->host) + 1] = phb->port & 0xff;
412
413	if (write(source, buf, (5 + strlen(phb->host) + 2)) < (5 + strlen(phb->host) + 2)) {
414	close(source);
415	phb->func(phb->data, -1, GAIM_INPUT_READ);
416	g_free(phb->host);
417	g_free(phb);
418	return;
419	}
420
421	phb->inpa = gaim_input_add(source, GAIM_INPUT_READ, s5_canread_again, phb);
422	}
423
424	static void s5_readauth(gpointer data, gint source, GaimInputCondition cond)
425	{
426	unsigned char buf[512];
427	struct PHB *phb = data;
428
429	gaim_input_remove(phb->inpa);
430
431	if (read(source, buf, 2) < 2) {
432	close(source);
433	phb->func(phb->data, -1, GAIM_INPUT_READ);
434	g_free(phb->host);
435	g_free(phb);
436	return;
437	}
438
439	if ((buf[0] != 0x01) \|\| (buf[1] != 0x00)) {
440	close(source);
441	phb->func(phb->data, -1, GAIM_INPUT_READ);
442	g_free(phb->host);
443	g_free(phb);
444	return;
445	}
446
447	s5_sendconnect(phb, source);
448	}
449
450	static void s5_canread(gpointer data, gint source, GaimInputCondition cond)
451	{
452	unsigned char buf[512];
453	struct PHB *phb = data;
454
455	gaim_input_remove(phb->inpa);
456
457	if (read(source, buf, 2) < 2) {
458	close(source);
459	phb->func(phb->data, -1, GAIM_INPUT_READ);
460	g_free(phb->host);
461	g_free(phb);
462	return;
463	}
464
465	if ((buf[0] != 0x05) \|\| (buf[1] == 0xff)) {
466	close(source);
467	phb->func(phb->data, -1, GAIM_INPUT_READ);
468	g_free(phb->host);
469	g_free(phb);
470	return;
471	}
472
473	if (buf[1] == 0x02) {
474	unsigned int i = strlen(proxyuser), j = strlen(proxypass);
475	buf[0] = 0x01; /* version 1 */
476	buf[1] = i;
477	memcpy(buf + 2, proxyuser, i);
478	buf[2 + i] = j;
479	memcpy(buf + 2 + i + 1, proxypass, j);
480	if (write(source, buf, 3 + i + j) < 3 + i + j) {
481	close(source);
482	phb->func(phb->data, -1, GAIM_INPUT_READ);
483	g_free(phb->host);
484	g_free(phb);
485	return;
486	}
487
488	phb->inpa = gaim_input_add(source, GAIM_INPUT_READ, s5_readauth, phb);
489	} else {
490	s5_sendconnect(phb, source);
491	}
492	}
493
494	static void s5_canwrite(gpointer data, gint source, GaimInputCondition cond)
495	{
496	unsigned char buf[512];
497	int i;
498	struct PHB *phb = data;
499	unsigned int len;
500	int error = ETIMEDOUT;
501	if (phb->inpa > 0)
502	gaim_input_remove(phb->inpa);
503	len = sizeof(error);
504	if (getsockopt(source, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
505	close(source);
506	phb->func(phb->data, -1, GAIM_INPUT_READ);
507	g_free(phb->host);
508	g_free(phb);
509	return;
510	}
511	#ifdef F_SETFL
512	fcntl(source, F_SETFL, 0);
513	#endif
514
515	i = 0;
516	buf[0] = 0x05; /* SOCKS version 5 */
517	if (proxyuser[0]) {
518	buf[1] = 0x02; /* two methods */
519	buf[2] = 0x00; /* no authentication */
520	buf[3] = 0x02; /* username/password authentication */
521	i = 4;
522	} else {
523	buf[1] = 0x01;
524	buf[2] = 0x00;
525	i = 3;
526	}
527
528	if (write(source, buf, i) < i) {
529	close(source);
530	phb->func(phb->data, -1, GAIM_INPUT_READ);
531	g_free(phb->host);
532	g_free(phb);
533	return;
534	}
535
536	phb->inpa = gaim_input_add(source, GAIM_INPUT_READ, s5_canread, phb);
537	}
538
539	static int proxy_connect_socks5(const char host, unsigned short port, struct PHB phb)
540	{
541	phb->host = g_strdup(host);
542	phb->port = port;
543	phb->proxy_func = s5_canwrite;
544	phb->proxy_data = phb;
545
546	return( proxy_connect_none( proxyhost, proxyport, phb ) );
547	}
548
549
550	/* Export functions */
551
552	gint gaim_input_add(gint source, GaimInputCondition condition, GaimInputFunction function, gpointer data)
553	{
554	GaimIOClosure *closure = g_new0(GaimIOClosure, 1);
555	GIOChannel *channel;
556	GIOCondition cond = 0;
557
558	closure->function = function;
559	closure->data = data;
560
561	if (condition & GAIM_INPUT_READ)
562	cond \|= GAIM_READ_COND;
563	if (condition & GAIM_INPUT_WRITE)
564	cond \|= GAIM_WRITE_COND;
565
566	channel = g_io_channel_unix_new(source);
567	closure->result = g_io_add_watch_full(channel, G_PRIORITY_DEFAULT, cond,
568	gaim_io_invoke, closure, gaim_io_destroy);
569
570	g_io_channel_unref(channel);
571	return closure->result;
572	}
573
574	void gaim_input_remove(gint tag)
575	{
576	if (tag > 0)
577	g_source_remove(tag);
578	}
579
580	int proxy_connect(const char *host, int port, GaimInputFunction func, gpointer data)
581	{
582	struct PHB *phb;
583
584	if (!host \|\| !port \|\| (port == -1) \|\| !func \|\| strlen(host) > 128) {
585	return -1;
586	}
587
588	phb = g_new0(struct PHB, 1);
589	phb->func = func;
590	phb->data = data;
591
592	#ifndef _WIN32
593	sethostent(1);
594	#endif
595
596	if ((proxytype == PROXY_NONE) \|\| !proxyhost \|\| !proxyhost[0] \|\| !proxyport \|\| (proxyport == -1))
597	return proxy_connect_none(host, port, phb);
598	else if (proxytype == PROXY_HTTP)
599	return proxy_connect_http(host, port, phb);
600	else if (proxytype == PROXY_SOCKS4)
601	return proxy_connect_socks4(host, port, phb);
602	else if (proxytype == PROXY_SOCKS5)
603	return proxy_connect_socks5(host, port, phb);
604
605	if (phb->host) g_free(phb);
606	g_free(phb);
607	return -1;
608	}

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