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source: lib/proxy.c @ f01bc6f

Last change on this file since f01bc6f was 389ce9f, checked in by Wilmer van der Gaast <wilmer@…>, at 2010-10-24T22:20:40Z
Another compatibility fix: AI_ADDRCONFIG doesn't exist on some systems.
Property mode set to `100644`
File size: 13.6 KB

Line
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	#define BITLBEE_CORE
24	#include <stdio.h>
25	#include <stdlib.h>
26	#include <string.h>
27	#include <sys/types.h>
28	#ifndef _WIN32
29	#include <sys/socket.h>
30	#include <netdb.h>
31	#include <netinet/in.h>
32	#include <arpa/inet.h>
33	#include <unistd.h>
34	#else
35	#include "sock.h"
36	#define ETIMEDOUT WSAETIMEDOUT
37	#define EINPROGRESS WSAEINPROGRESS
38	#endif
39	#include <fcntl.h>
40	#include <errno.h>
41	#include "nogaim.h"
42	#include "proxy.h"
43	#include "base64.h"
44
45	char proxyhost[128] = "";
46	int proxyport = 0;
47	int proxytype = PROXY_NONE;
48	char proxyuser[128] = "";
49	char proxypass[128] = "";
50
51	/* Some systems don't know this one. It's not essential, so set it to 0 then. */
52	#ifndef AI_NUMERICSERV
53	#define AI_NUMERICSERV 0
54	#endif
55	#ifndef AI_ADDRCONFIG
56	#define AI_ADDRCONFIG 0
57	#endif
58
59	struct PHB {
60	b_event_handler func, proxy_func;
61	gpointer data, proxy_data;
62	char *host;
63	int port;
64	int fd;
65	gint inpa;
66	struct addrinfo gai, gai_cur;
67	};
68
69	static int proxy_connect_none(const char host, unsigned short port_, struct PHB phb);
70
71	static gboolean gaim_io_connected(gpointer data, gint source, b_input_condition cond)
72	{
73	struct PHB *phb = data;
74	unsigned int len;
75	int error = ETIMEDOUT;
76	len = sizeof(error);
77
78	#ifndef _WIN32
79	if (getsockopt(source, SOL_SOCKET, SO_ERROR, &error, &len) < 0 \|\| error) {
80	if ((phb->gai_cur = phb->gai_cur->ai_next)) {
81	int new_fd;
82	b_event_remove(phb->inpa);
83	if ((new_fd = proxy_connect_none(NULL, 0, phb))) {
84	b_event_remove(phb->inpa);
85	closesocket(source);
86	dup2(new_fd, source);
87	phb->inpa = b_input_add(source, B_EV_IO_WRITE, gaim_io_connected, phb);
88	return FALSE;
89	}
90	}
91	freeaddrinfo(phb->gai);
92	closesocket(source);
93	b_event_remove(phb->inpa);
94	if( phb->proxy_func )
95	phb->proxy_func(phb->proxy_data, -1, B_EV_IO_READ);
96	else {
97	phb->func(phb->data, -1, B_EV_IO_READ);
98	g_free(phb);
99	}
100	return FALSE;
101	}
102	#endif
103	freeaddrinfo(phb->gai);
104	sock_make_blocking(source);
105	b_event_remove(phb->inpa);
106	if( phb->proxy_func )
107	phb->proxy_func(phb->proxy_data, source, B_EV_IO_READ);
108	else {
109	phb->func(phb->data, source, B_EV_IO_READ);
110	g_free(phb);
111	}
112
113	return FALSE;
114	}
115
116	static int proxy_connect_none(const char host, unsigned short port_, struct PHB phb)
117	{
118	struct sockaddr_in me;
119	int fd = -1;
120
121	if (phb->gai_cur == NULL)
122	{
123	int ret;
124	char port[6];
125	struct addrinfo hints;
126
127	g_snprintf(port, sizeof(port), "%d", port_);
128
129	memset(&hints, 0, sizeof(struct addrinfo));
130	hints.ai_family = AF_UNSPEC;
131	hints.ai_socktype = SOCK_STREAM;
132	hints.ai_flags = AI_ADDRCONFIG \| AI_NUMERICSERV;
133
134	if (!(ret = getaddrinfo(host, port, &hints, &phb->gai)))
135	phb->gai_cur = phb->gai;
136	else
137	event_debug("gai(): %s\n", gai_strerror(ret));
138	}
139
140	for (; phb->gai_cur; phb->gai_cur = phb->gai_cur->ai_next)
141	{
142	if ((fd = socket(phb->gai_cur->ai_family, phb->gai_cur->ai_socktype, phb->gai_cur->ai_protocol)) < 0) {
143	event_debug( "socket failed: %d\n", errno);
144	continue;
145	}
146
147	sock_make_nonblocking(fd);
148
149	if (global.conf->iface_out)
150	{
151	me.sin_family = AF_INET;
152	me.sin_port = 0;
153	me.sin_addr.s_addr = inet_addr( global.conf->iface_out );
154
155	if (bind(fd, (struct sockaddr *) &me, sizeof(me)) != 0)
156	event_debug("bind( %d, \"%s\" ) failure\n", fd, global.conf->iface_out);
157	}
158
159	event_debug("proxy_connect_none( \"%s\", %d ) = %d\n", host, port, fd);
160
161	if (connect(fd, phb->gai_cur->ai_addr, phb->gai_cur->ai_addrlen) < 0 && !sockerr_again()) {
162	event_debug( "connect failed: %s\n", strerror(errno));
163	closesocket(fd);
164	fd = -1;
165	continue;
166	} else {
167	phb->inpa = b_input_add(fd, B_EV_IO_WRITE, gaim_io_connected, phb);
168	phb->fd = fd;
169
170	break;
171	}
172	}
173
174	if(fd < 0 && host)
175	g_free(phb);
176
177	return fd;
178	}
179
180
181	/* Connecting to HTTP proxies */
182
183	#define HTTP_GOODSTRING "HTTP/1.0 200 Connection established"
184	#define HTTP_GOODSTRING2 "HTTP/1.1 200 Connection established"
185
186	static gboolean http_canread(gpointer data, gint source, b_input_condition cond)
187	{
188	int nlc = 0;
189	int pos = 0;
190	struct PHB *phb = data;
191	char inputline[8192];
192
193	b_event_remove(phb->inpa);
194
195	while ((pos < sizeof(inputline)-1) && (nlc != 2) && (read(source, &inputline[pos++], 1) == 1)) {
196	if (inputline[pos - 1] == '\n')
197	nlc++;
198	else if (inputline[pos - 1] != '\r')
199	nlc = 0;
200	}
201	inputline[pos] = '\0';
202
203	if ((memcmp(HTTP_GOODSTRING, inputline, strlen(HTTP_GOODSTRING)) == 0) \|\|
204	(memcmp(HTTP_GOODSTRING2, inputline, strlen(HTTP_GOODSTRING2)) == 0)) {
205	phb->func(phb->data, source, B_EV_IO_READ);
206	g_free(phb->host);
207	g_free(phb);
208	return FALSE;
209	}
210
211	close(source);
212	phb->func(phb->data, -1, B_EV_IO_READ);
213	g_free(phb->host);
214	g_free(phb);
215
216	return FALSE;
217	}
218
219	static gboolean http_canwrite(gpointer data, gint source, b_input_condition cond)
220	{
221	char cmd[384];
222	struct PHB *phb = data;
223	unsigned int len;
224	int error = ETIMEDOUT;
225	if (phb->inpa > 0)
226	b_event_remove(phb->inpa);
227	len = sizeof(error);
228	if (getsockopt(source, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
229	close(source);
230	phb->func(phb->data, -1, B_EV_IO_READ);
231	g_free(phb->host);
232	g_free(phb);
233	return FALSE;
234	}
235	sock_make_blocking(source);
236
237	g_snprintf(cmd, sizeof(cmd), "CONNECT %s:%d HTTP/1.1\r\nHost: %s:%d\r\n", phb->host, phb->port,
238	phb->host, phb->port);
239	if (send(source, cmd, strlen(cmd), 0) < 0) {
240	close(source);
241	phb->func(phb->data, -1, B_EV_IO_READ);
242	g_free(phb->host);
243	g_free(phb);
244	return FALSE;
245	}
246
247	if (strlen(proxyuser) > 0) {
248	char t1, t2;
249	t1 = g_strdup_printf("%s:%s", proxyuser, proxypass);
250	t2 = tobase64(t1);
251	g_free(t1);
252	g_snprintf(cmd, sizeof(cmd), "Proxy-Authorization: Basic %s\r\n", t2);
253	g_free(t2);
254	if (send(source, cmd, strlen(cmd), 0) < 0) {
255	close(source);
256	phb->func(phb->data, -1, B_EV_IO_READ);
257	g_free(phb->host);
258	g_free(phb);
259	return FALSE;
260	}
261	}
262
263	g_snprintf(cmd, sizeof(cmd), "\r\n");
264	if (send(source, cmd, strlen(cmd), 0) < 0) {
265	close(source);
266	phb->func(phb->data, -1, B_EV_IO_READ);
267	g_free(phb->host);
268	g_free(phb);
269	return FALSE;
270	}
271
272	phb->inpa = b_input_add(source, B_EV_IO_READ, http_canread, phb);
273
274	return FALSE;
275	}
276
277	static int proxy_connect_http(const char host, unsigned short port, struct PHB phb)
278	{
279	phb->host = g_strdup(host);
280	phb->port = port;
281	phb->proxy_func = http_canwrite;
282	phb->proxy_data = phb;
283
284	return( proxy_connect_none( proxyhost, proxyport, phb ) );
285	}
286
287
288	/* Connecting to SOCKS4 proxies */
289
290	static gboolean s4_canread(gpointer data, gint source, b_input_condition cond)
291	{
292	unsigned char packet[12];
293	struct PHB *phb = data;
294
295	b_event_remove(phb->inpa);
296
297	memset(packet, 0, sizeof(packet));
298	if (read(source, packet, 9) >= 4 && packet[1] == 90) {
299	phb->func(phb->data, source, B_EV_IO_READ);
300	g_free(phb->host);
301	g_free(phb);
302	return FALSE;
303	}
304
305	close(source);
306	phb->func(phb->data, -1, B_EV_IO_READ);
307	g_free(phb->host);
308	g_free(phb);
309
310	return FALSE;
311	}
312
313	static gboolean s4_canwrite(gpointer data, gint source, b_input_condition cond)
314	{
315	unsigned char packet[12];
316	struct hostent *hp;
317	struct PHB *phb = data;
318	unsigned int len;
319	int error = ETIMEDOUT;
320	if (phb->inpa > 0)
321	b_event_remove(phb->inpa);
322	len = sizeof(error);
323	if (getsockopt(source, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
324	close(source);
325	phb->func(phb->data, -1, B_EV_IO_READ);
326	g_free(phb->host);
327	g_free(phb);
328	return FALSE;
329	}
330	sock_make_blocking(source);
331
332	/* XXX does socks4 not support host name lookups by the proxy? */
333	if (!(hp = gethostbyname(phb->host))) {
334	close(source);
335	phb->func(phb->data, -1, B_EV_IO_READ);
336	g_free(phb->host);
337	g_free(phb);
338	return FALSE;
339	}
340
341	packet[0] = 4;
342	packet[1] = 1;
343	packet[2] = phb->port >> 8;
344	packet[3] = phb->port & 0xff;
345	packet[4] = (unsigned char)(hp->h_addr_list[0])[0];
346	packet[5] = (unsigned char)(hp->h_addr_list[0])[1];
347	packet[6] = (unsigned char)(hp->h_addr_list[0])[2];
348	packet[7] = (unsigned char)(hp->h_addr_list[0])[3];
349	packet[8] = 0;
350	if (write(source, packet, 9) != 9) {
351	close(source);
352	phb->func(phb->data, -1, B_EV_IO_READ);
353	g_free(phb->host);
354	g_free(phb);
355	return FALSE;
356	}
357
358	phb->inpa = b_input_add(source, B_EV_IO_READ, s4_canread, phb);
359
360	return FALSE;
361	}
362
363	static int proxy_connect_socks4(const char host, unsigned short port, struct PHB phb)
364	{
365	phb->host = g_strdup(host);
366	phb->port = port;
367	phb->proxy_func = s4_canwrite;
368	phb->proxy_data = phb;
369
370	return( proxy_connect_none( proxyhost, proxyport, phb ) );
371	}
372
373
374	/* Connecting to SOCKS5 proxies */
375
376	static gboolean s5_canread_again(gpointer data, gint source, b_input_condition cond)
377	{
378	unsigned char buf[512];
379	struct PHB *phb = data;
380
381	b_event_remove(phb->inpa);
382
383	if (read(source, buf, 10) < 10) {
384	close(source);
385	phb->func(phb->data, -1, B_EV_IO_READ);
386	g_free(phb->host);
387	g_free(phb);
388	return FALSE;
389	}
390	if ((buf[0] != 0x05) \|\| (buf[1] != 0x00)) {
391	close(source);
392	phb->func(phb->data, -1, B_EV_IO_READ);
393	g_free(phb->host);
394	g_free(phb);
395	return FALSE;
396	}
397
398	phb->func(phb->data, source, B_EV_IO_READ);
399	g_free(phb->host);
400	g_free(phb);
401
402	return FALSE;
403	}
404
405	static void s5_sendconnect(gpointer data, gint source)
406	{
407	unsigned char buf[512];
408	struct PHB *phb = data;
409	int hlen = strlen(phb->host);
410
411	buf[0] = 0x05;
412	buf[1] = 0x01; /* CONNECT */
413	buf[2] = 0x00; /* reserved */
414	buf[3] = 0x03; /* address type -- host name */
415	buf[4] = hlen;
416	memcpy(buf + 5, phb->host, hlen);
417	buf[5 + strlen(phb->host)] = phb->port >> 8;
418	buf[5 + strlen(phb->host) + 1] = phb->port & 0xff;
419
420	if (write(source, buf, (5 + strlen(phb->host) + 2)) < (5 + strlen(phb->host) + 2)) {
421	close(source);
422	phb->func(phb->data, -1, B_EV_IO_READ);
423	g_free(phb->host);
424	g_free(phb);
425	return;
426	}
427
428	phb->inpa = b_input_add(source, B_EV_IO_READ, s5_canread_again, phb);
429	}
430
431	static gboolean s5_readauth(gpointer data, gint source, b_input_condition cond)
432	{
433	unsigned char buf[512];
434	struct PHB *phb = data;
435
436	b_event_remove(phb->inpa);
437
438	if (read(source, buf, 2) < 2) {
439	close(source);
440	phb->func(phb->data, -1, B_EV_IO_READ);
441	g_free(phb->host);
442	g_free(phb);
443	return FALSE;
444	}
445
446	if ((buf[0] != 0x01) \|\| (buf[1] != 0x00)) {
447	close(source);
448	phb->func(phb->data, -1, B_EV_IO_READ);
449	g_free(phb->host);
450	g_free(phb);
451	return FALSE;
452	}
453
454	s5_sendconnect(phb, source);
455
456	return FALSE;
457	}
458
459	static gboolean s5_canread(gpointer data, gint source, b_input_condition cond)
460	{
461	unsigned char buf[512];
462	struct PHB *phb = data;
463
464	b_event_remove(phb->inpa);
465
466	if (read(source, buf, 2) < 2) {
467	close(source);
468	phb->func(phb->data, -1, B_EV_IO_READ);
469	g_free(phb->host);
470	g_free(phb);
471	return FALSE;
472	}
473
474	if ((buf[0] != 0x05) \|\| (buf[1] == 0xff)) {
475	close(source);
476	phb->func(phb->data, -1, B_EV_IO_READ);
477	g_free(phb->host);
478	g_free(phb);
479	return FALSE;
480	}
481
482	if (buf[1] == 0x02) {
483	unsigned int i = strlen(proxyuser), j = strlen(proxypass);
484	buf[0] = 0x01; /* version 1 */
485	buf[1] = i;
486	memcpy(buf + 2, proxyuser, i);
487	buf[2 + i] = j;
488	memcpy(buf + 2 + i + 1, proxypass, j);
489	if (write(source, buf, 3 + i + j) < 3 + i + j) {
490	close(source);
491	phb->func(phb->data, -1, B_EV_IO_READ);
492	g_free(phb->host);
493	g_free(phb);
494	return FALSE;
495	}
496
497	phb->inpa = b_input_add(source, B_EV_IO_READ, s5_readauth, phb);
498	} else {
499	s5_sendconnect(phb, source);
500	}
501
502	return FALSE;
503	}
504
505	static gboolean s5_canwrite(gpointer data, gint source, b_input_condition cond)
506	{
507	unsigned char buf[512];
508	int i;
509	struct PHB *phb = data;
510	unsigned int len;
511	int error = ETIMEDOUT;
512	if (phb->inpa > 0)
513	b_event_remove(phb->inpa);
514	len = sizeof(error);
515	if (getsockopt(source, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
516	close(source);
517	phb->func(phb->data, -1, B_EV_IO_READ);
518	g_free(phb->host);
519	g_free(phb);
520	return FALSE;
521	}
522	sock_make_blocking(source);
523
524	i = 0;
525	buf[0] = 0x05; /* SOCKS version 5 */
526	if (proxyuser[0]) {
527	buf[1] = 0x02; /* two methods */
528	buf[2] = 0x00; /* no authentication */
529	buf[3] = 0x02; /* username/password authentication */
530	i = 4;
531	} else {
532	buf[1] = 0x01;
533	buf[2] = 0x00;
534	i = 3;
535	}
536
537	if (write(source, buf, i) < i) {
538	close(source);
539	phb->func(phb->data, -1, B_EV_IO_READ);
540	g_free(phb->host);
541	g_free(phb);
542	return FALSE;
543	}
544
545	phb->inpa = b_input_add(source, B_EV_IO_READ, s5_canread, phb);
546
547	return FALSE;
548	}
549
550	static int proxy_connect_socks5(const char host, unsigned short port, struct PHB phb)
551	{
552	phb->host = g_strdup(host);
553	phb->port = port;
554	phb->proxy_func = s5_canwrite;
555	phb->proxy_data = phb;
556
557	return( proxy_connect_none( proxyhost, proxyport, phb ) );
558	}
559
560
561	/* Export functions */
562
563	int proxy_connect(const char *host, int port, b_event_handler func, gpointer data)
564	{
565	struct PHB *phb;
566
567	if (!host \|\| port <= 0 \|\| !func \|\| strlen(host) > 128) {
568	return -1;
569	}
570
571	phb = g_new0(struct PHB, 1);
572	phb->func = func;
573	phb->data = data;
574
575	if (proxytype == PROXY_NONE \|\| !proxyhost[0] \|\| proxyport <= 0)
576	return proxy_connect_none(host, port, phb);
577	else if (proxytype == PROXY_HTTP)
578	return proxy_connect_http(host, port, phb);
579	else if (proxytype == PROXY_SOCKS4)
580	return proxy_connect_socks4(host, port, phb);
581	else if (proxytype == PROXY_SOCKS5)
582	return proxy_connect_socks5(host, port, phb);
583
584	g_free(phb);
585	return -1;
586	}

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