ObjFW  Artifact [8d47abae82]

Artifact 8d47abae82d0ad3b048dbbf6c50b50caf86e69b1ab251778f6642b6bf4c8d3a6:

• File src/OFTCPSocket+SOCKS5.m — part of check-in [3d16a30f41] at 2013-06-22 12:12:36 on branch trunk — Rework exceptions.

  This mostly removes the argument for the class in which the exception
  occurred. As backtraces were recently added for all platforms, the
  passed class does not give any extra information on where the exception
  occurred anymore.

  This also removes a few other arguments which were not too helpful. In
  the past, the idea was to pass as many arguments as possible so that it
  is easier to find the origin of the exception. However, as backtraces
  are a much better way to find the origin, those are not useful anymore
  and just make the exception more cumbersome to use. The rule is now to
  only pass arguments that might help in recovering from the exception or
  provide information that is otherwise not easily accessible. (user: js, size: 2352) [annotate] [blame] [check-ins using]

/*
 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013
 *   Jonathan Schleifer <js@webkeks.org>
 *
 * All rights reserved.
 *
 * This file is part of ObjFW. It may be distributed under the terms of the
 * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
 * the packaging of this file.
 *
 * Alternatively, it may be distributed under the terms of the GNU General
 * Public License, either version 2 or 3, which can be found in the file
 * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
 * file.
 */

#include "config.h"

#import "OFTCPSocket+SOCKS5.h"

#import "OFConnectionFailedException.h"

/* Reference for static linking */
int _OFTCPSocket_SOCKS5_reference;

@implementation OFTCPSocket (SOCKS5)
- (void)OF_SOCKS5ConnectToHost: (OFString*)host
			  port: (uint16_t)port
{
	const char request[] = { 5, 1, 0, 3 };
	char reply[256];
	bool wasWriteBufferEnabled;

	/* 5 1 0 -> no authentication */
	[self writeBuffer: request
		   length: 3];

	[self readIntoBuffer: reply
		 exactLength: 2];

	if (reply[0] != 5 || reply[1] != 0) {
		[self close];
		@throw [OFConnectionFailedException exceptionWithHost: host
								 port: port
							       socket: self];
	}

	wasWriteBufferEnabled = [self isWriteBufferEnabled];
	[self setWriteBufferEnabled: true];

	/* CONNECT request */
	[self writeBuffer: request
		   length: 4];
	[self writeInt8: [host UTF8StringLength]];
	[self writeBuffer: [host UTF8String]
		   length: [host UTF8StringLength]];
	[self writeBigEndianInt16: port];

	[self flushWriteBuffer];
	[self setWriteBufferEnabled: wasWriteBufferEnabled];

	[self readIntoBuffer: reply
		 exactLength: 4];

	if (reply[0] != 5 || reply[1] != 0 || reply[2] != 0) {
		[self close];
		@throw [OFConnectionFailedException exceptionWithHost: host
								 port: port
							       socket: self];
	}

	/* Skip the rest of the reply */
	switch (reply[3]) {
	case 1: /* IPv4 */
		[self readIntoBuffer: reply
			 exactLength: 4];
		break;
	case 3: /* Domainname */
		[self readIntoBuffer: reply
			 exactLength: [self readInt8]];
		break;
	case 4: /* IPv6 */
		[self readIntoBuffer: reply
			 exactLength: 16];
		break;
	default:
		[self close];
		@throw [OFConnectionFailedException exceptionWithHost: host
								 port: port
							       socket: self];
	}

	[self readBigEndianInt16];
}
@end