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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *  * Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  *  * Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in
     12  *    the documentation and/or other materials provided with the
     13  *    distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     16  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     17  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     18  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
     19  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
     22  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     25  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <cutils/sockets.h>
     30 
     31 #include <errno.h>
     32 
     33 #define LISTEN_BACKLOG 4
     34 
     35 extern bool initialize_windows_sockets();
     36 
     37 SOCKET socket_inaddr_any_server(int port, int type) {
     38     if (!initialize_windows_sockets()) {
     39       return INVALID_SOCKET;
     40     }
     41 
     42     SOCKET sock = socket(AF_INET6, type, 0);
     43     if (sock == INVALID_SOCKET) {
     44         return INVALID_SOCKET;
     45     }
     46 
     47     // Enforce exclusive addresses so nobody can steal the port from us (1),
     48     // and enable dual-stack so both IPv4 and IPv6 work (2).
     49     // (1) https://msdn.microsoft.com/en-us/library/windows/desktop/ms740621(v=vs.85).aspx.
     50     // (2) https://msdn.microsoft.com/en-us/library/windows/desktop/bb513665(v=vs.85).aspx.
     51     int exclusive = 1;
     52     DWORD v6_only = 0;
     53     if (setsockopt(sock, SOL_SOCKET, SO_EXCLUSIVEADDRUSE, (char*)&exclusive,
     54                    sizeof(exclusive)) == SOCKET_ERROR ||
     55         setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&v6_only,
     56                    sizeof(v6_only)) == SOCKET_ERROR) {
     57         closesocket(sock);
     58         return INVALID_SOCKET;
     59     }
     60 
     61     // Bind the socket to our local port.
     62     struct sockaddr_in6 addr;
     63     memset(&addr, 0, sizeof(addr));
     64     addr.sin6_family = AF_INET6;
     65     addr.sin6_port = htons(port);
     66     addr.sin6_addr = in6addr_any;
     67     if (bind(sock, (struct sockaddr*)&addr, sizeof(addr)) == SOCKET_ERROR) {
     68         closesocket(sock);
     69         return INVALID_SOCKET;
     70     }
     71 
     72     // Start listening for connections if this is a TCP socket.
     73     if (type == SOCK_STREAM && listen(sock, LISTEN_BACKLOG) == SOCKET_ERROR) {
     74         closesocket(sock);
     75         return INVALID_SOCKET;
     76     }
     77 
     78     return sock;
     79 }
     80