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 <errno.h>
30
31#include <cutils/sockets.h>
32
33#define LISTEN_BACKLOG 4
34
35extern bool initialize_windows_sockets();
36
37SOCKET 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