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101 lines
3.5 KiB
C++
101 lines
3.5 KiB
C++
/* https://github.com/ncm/selectable-socketpair
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Copyright 2007, 2010 by Nathan C. Myers <ncm@cantrip.org>
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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The name of the author must not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <LibCore/SocketAddressWindows.h>
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#include <AK/Windows.h>
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namespace Core::System {
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int windows_socketpair(SOCKET socks[2], int make_overlapped)
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{
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union {
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struct sockaddr_in inaddr;
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struct sockaddr addr;
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} a;
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SOCKET listener;
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int e;
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socklen_t addrlen = sizeof(a.inaddr);
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DWORD flags = (make_overlapped ? WSA_FLAG_OVERLAPPED : 0);
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int reuse = 1;
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if (socks == 0) {
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WSASetLastError(WSAEINVAL);
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return SOCKET_ERROR;
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}
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socks[0] = socks[1] = -1;
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listener = ::socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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if (listener == INVALID_SOCKET)
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return SOCKET_ERROR;
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memset(&a, 0, sizeof(a));
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a.inaddr.sin_family = AF_INET;
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a.inaddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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a.inaddr.sin_port = 0;
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for (;;) {
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if (::setsockopt(listener, SOL_SOCKET, SO_REUSEADDR, (char*)&reuse, (socklen_t)sizeof(reuse)) == -1)
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break;
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if (bind(listener, &a.addr, sizeof(a.inaddr)) == SOCKET_ERROR)
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break;
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memset(&a, 0, sizeof(a));
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if (getsockname(listener, &a.addr, &addrlen) == SOCKET_ERROR)
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break;
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// win32 getsockname may only set the port number, p=0.0005.
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// ( http://msdn.microsoft.com/library/ms738543.aspx ):
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a.inaddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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a.inaddr.sin_family = AF_INET;
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if (::listen(listener, 1) == SOCKET_ERROR)
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break;
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socks[0] = WSASocket(AF_INET, SOCK_STREAM, 0, NULL, 0, flags);
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if (socks[0] == INVALID_SOCKET)
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break;
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if (connect(socks[0], &a.addr, sizeof(a.inaddr)) == SOCKET_ERROR)
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break;
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socks[1] = ::accept(listener, NULL, NULL);
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if (socks[1] == INVALID_SOCKET)
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break;
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closesocket(listener);
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return 0;
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}
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e = WSAGetLastError();
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closesocket(listener);
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closesocket(socks[0]);
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closesocket(socks[1]);
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WSASetLastError(e);
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socks[0] = socks[1] = -1;
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return SOCKET_ERROR;
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}
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}
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