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#import "OFAlreadyOpenException.h"
#import "OFBindIPSocketFailedException.h"
#import "OFGetOptionFailedException.h"
#import "OFNotImplementedException.h"
#import "OFNotOpenException.h"
#import "OFSetOptionFailedException.h"

#ifdef OF_LINUX
# include <linux/mptcp.h>
#endif

#if defined(OF_MACOS) || defined(OF_IOS)
# ifndef AF_MULTIPATH
#  define AF_MULTIPATH 39
# endif
#endif

enum {
	flagUseMPTCP = 1,
	flagMapIPv4 = 2,
	flagUseConnectX = 4
};

static const OFRunLoopMode connectRunLoopMode =
    @"OFTCPSocketConnectRunLoopMode";

static OFString *defaultSOCKS5Host = nil;
static uint16_t defaultSOCKS5Port = 1080;

#if defined(OF_LINUX) && defined(IPPROTO_MPTCP)
static OFSocketAddress
mapIPv4(const OFSocketAddress *IPv4Address)
{
	OFSocketAddress IPv6Address = {
		.family = OFSocketAddressFamilyIPv6,
		.length = sizeof(struct sockaddr_in6)
	};

	IPv6Address.sockaddr.in6.sin6_family = AF_INET6;
	IPv6Address.sockaddr.in6.sin6_port = IPv4Address->sockaddr.in.sin_port;
	memcpy(&IPv6Address.sockaddr.in6.sin6_addr.s6_addr[12],
	    &IPv4Address->sockaddr.in.sin_addr.s_addr, 4);
	IPv6Address.sockaddr.in6.sin6_addr.s6_addr[10] = 0xFF;
	IPv6Address.sockaddr.in6.sin6_addr.s6_addr[11] = 0xFF;

	return IPv6Address;
}
#endif

@interface OFTCPSocket () <OFAsyncIPSocketConnecting>
@end

@interface OFTCPSocketConnectDelegate: OFObject <OFTCPSocketDelegate>
{
@public
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#if SOCK_CLOEXEC == 0 && defined(HAVE_FCNTL) && defined(FD_CLOEXEC)
	int flags;
#endif

	if (_socket != OFInvalidSocketHandle)
		@throw [OFAlreadyOpenException exceptionWithObject: self];

#if defined(OF_LINUX) && defined(IPPROTO_MPTCP)
	if (_flags & flagUseMPTCP) {
		/*
		 * For MPTCP sockets, we always use AF_INET6, so that IPv4 and
		 * IPv6 can both be used for a single connection.
		 */
		_socket = socket(AF_INET6, SOCK_STREAM | SOCK_CLOEXEC,
		    IPPROTO_MPTCP);

		if (_socket != OFInvalidSocketHandle &&
		    address->family == OFSocketAddressFamilyIPv4)
			_flags |= flagMapIPv4;
		else
			_flags &= ~flagMapIPv4;
	}
#elif defined(OF_MACOS) || defined(OF_IOS)
	if (_flags & flagUseMPTCP) {
		_socket = socket(AF_MULTIPATH, SOCK_STREAM | SOCK_CLOEXEC,
		    IPPROTO_TCP);

		if (_socket != OFInvalidSocketHandle)
			_flags |= flagUseConnectX;
		else
			_flags &= ~flagUseConnectX;
	}
#endif

	if (_socket == OFInvalidSocketHandle) {
	if ((_socket = socket(
	    ((struct sockaddr *)&address->sockaddr)->sa_family,
	    SOCK_STREAM | SOCK_CLOEXEC, 0)) == OFInvalidSocketHandle) {
		*errNo = _OFSocketErrNo();
		return false;
		if ((_socket = socket(
		    ((struct sockaddr *)&address->sockaddr)->sa_family,
		    SOCK_STREAM | SOCK_CLOEXEC, 0)) == OFInvalidSocketHandle) {
			*errNo = _OFSocketErrNo();
			return false;
		}
	}

#if SOCK_CLOEXEC == 0 && defined(HAVE_FCNTL) && defined(FD_CLOEXEC)
	if ((flags = fcntl(_socket, F_GETFD, 0)) != -1)
		fcntl(_socket, F_SETFD, flags | FD_CLOEXEC);
#endif

	return true;
}

- (bool)of_connectSocketToAddress: (const OFSocketAddress *)address
			    errNo: (int *)errNo
{
#if defined(OF_LINUX) && defined(IPPROTO_MPTCP)
	OFSocketAddress mappedIPv4;
#endif

	if (_socket == OFInvalidSocketHandle)
	if (_socket == OFInvalidSocketHandle) {
		@throw [OFNotOpenException exceptionWithObject: self];

	/* Cast needed for AmigaOS, where the argument is declared non-const */
	if (connect(_socket, (struct sockaddr *)&address->sockaddr,
	    address->length) != 0) {
		*errNo = _OFSocketErrNo();
		return false;
	}
	}

#if defined(OF_LINUX) && defined(IPPROTO_MPTCP)
	if (_flags & flagMapIPv4) {
		/*
		 * For MPTCP sockets, we always use AF_INET6, so that IPv4 and
		 * IPv6 can both be used for a single connection.
		 */
		mappedIPv4 = mapIPv4(address);
		address = &mappedIPv4;
	}
#endif

#if defined(OF_MACOS) || defined(OF_IOS)
	if (_flags & flagUseConnectX) {
		sa_endpoints_t endpoints = {
			.sae_dstaddr = (struct sockaddr *)&address->sockaddr,
			.sae_dstaddrlen = address->length
		};

		if (connectx(_socket, &endpoints, SAE_ASSOCID_ANY, 0, NULL, 0,
		    NULL, NULL) != 0) {
			*errNo = _OFSocketErrNo();
			return false;
		}
	} else
#endif
		/*
		 * Cast needed for AmigaOS, where the argument is declared
		 * non-const.
		 */
		if (connect(_socket, (struct sockaddr *)&address->sockaddr,
		    address->length) != 0) {
			*errNo = _OFSocketErrNo();
			return false;
		}

	return true;
}

- (void)of_closeSocket
{
	closesocket(_socket);
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	socketAddresses = [[OFThread DNSResolver]
	    resolveAddressesForHost: host
		      addressFamily: OFSocketAddressFamilyAny];

	address = *(OFSocketAddress *)[socketAddresses itemAtIndex: 0];
	OFSocketAddressSetIPPort(&address, port);

#if defined(OF_LINUX) && defined(IPPROTO_MPTCP)
	if (_flags & flagUseMPTCP) {
		/*
		 * For MPTCP sockets, we always use AF_INET6, so that IPv4 and
		 * IPv6 can both be used for a single connection.
		 */
		_socket = socket(AF_INET6, SOCK_STREAM | SOCK_CLOEXEC,
		    IPPROTO_MPTCP);

		if (_socket != OFInvalidSocketHandle &&
		    address.family == OFSocketAddressFamilyIPv4)
			address = mapIPv4(&address);
	}
#endif

	if (_socket == OFInvalidSocketHandle)
	if ((_socket = socket(
	    ((struct sockaddr *)&address.sockaddr)->sa_family,
	    SOCK_STREAM | SOCK_CLOEXEC, 0)) == OFInvalidSocketHandle)
		@throw [OFBindIPSocketFailedException
		    exceptionWithHost: host
				 port: port
			       socket: self
				errNo: _OFSocketErrNo()];
		if ((_socket = socket(
		    ((struct sockaddr *)&address.sockaddr)->sa_family,
		    SOCK_STREAM | SOCK_CLOEXEC, 0)) == OFInvalidSocketHandle)
			@throw [OFBindIPSocketFailedException
			    exceptionWithHost: host
					 port: port
				       socket: self
					errNo: _OFSocketErrNo()];

	_canBlock = true;

#if SOCK_CLOEXEC == 0 && defined(HAVE_FCNTL) && defined(FD_CLOEXEC)
	if ((flags = fcntl(_socket, F_GETFD, 0)) != -1)
		fcntl(_socket, F_SETFD, flags | FD_CLOEXEC);
#endif
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		@throw [OFGetOptionFailedException
		    exceptionWithObject: self
				  errNo: _OFSocketErrNo()];

	return !v;
}
#endif

- (void)setUsesMPTCP: (bool)usesMPTCP
{
	if (usesMPTCP)
		_flags |= flagUseMPTCP;
	else
		_flags &= ~flagUseMPTCP;
}

- (bool)usesMPTCP
{
#if defined(OF_LINUX) && defined(SOL_MPTCP) && defined(MPTCP_INFO)
	struct mptcp_info info;
	socklen_t infoLen = (socklen_t)sizeof(info);

	if (getsockopt(_socket, SOL_MPTCP, MPTCP_INFO, &info, &infoLen) != -1)
		return true;
#endif

	return false;
}

- (void)close
{
#ifdef OF_WII
	_port = 0;
#endif

	[super close];
}
@end