161 lines
4.1 KiB
C
161 lines
4.1 KiB
C
/* sockets.c --- wrappers for Windows socket functions
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Copyright (C) 2008-2023 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Simon Josefsson */
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#include <config.h>
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/* Specification. */
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#include "sockets.h"
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#if WINDOWS_SOCKETS
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/* This includes winsock2.h on MinGW. */
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# include <sys/socket.h>
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# include "fd-hook.h"
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# if GNULIB_MSVC_NOTHROW
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# include "msvc-nothrow.h"
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# else
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# include <io.h>
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# endif
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/* Get set_winsock_errno, FD_TO_SOCKET etc. */
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# include "w32sock.h"
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static int
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close_fd_maybe_socket (const struct fd_hook *remaining_list,
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gl_close_fn primary,
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int fd)
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{
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/* Note about multithread-safety: There is a race condition where, between
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our calls to closesocket() and the primary close(), some other thread
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could make system calls that allocate precisely the same HANDLE value
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as sock; then the primary close() would call CloseHandle() on it. */
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SOCKET sock;
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WSANETWORKEVENTS ev;
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/* Test whether fd refers to a socket. */
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sock = FD_TO_SOCKET (fd);
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ev.lNetworkEvents = 0xDEADBEEF;
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WSAEnumNetworkEvents (sock, NULL, &ev);
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if (ev.lNetworkEvents != 0xDEADBEEF)
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{
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/* fd refers to a socket. */
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/* FIXME: other applications, like squid, use an undocumented
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_free_osfhnd free function. But this is not enough: The 'osfile'
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flags for fd also needs to be cleared, but it is hard to access it.
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Instead, here we just close twice the file descriptor. */
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if (closesocket (sock))
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{
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set_winsock_errno ();
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return -1;
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}
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else
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{
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/* This call frees the file descriptor and does a
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CloseHandle ((HANDLE) _get_osfhandle (fd)), which fails. */
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_close (fd);
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return 0;
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}
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}
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else
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/* Some other type of file descriptor. */
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return execute_close_hooks (remaining_list, primary, fd);
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}
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static int
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ioctl_fd_maybe_socket (const struct fd_hook *remaining_list,
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gl_ioctl_fn primary,
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int fd, int request, void *arg)
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{
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SOCKET sock;
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WSANETWORKEVENTS ev;
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/* Test whether fd refers to a socket. */
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sock = FD_TO_SOCKET (fd);
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ev.lNetworkEvents = 0xDEADBEEF;
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WSAEnumNetworkEvents (sock, NULL, &ev);
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if (ev.lNetworkEvents != 0xDEADBEEF)
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{
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/* fd refers to a socket. */
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if (ioctlsocket (sock, request, arg) < 0)
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{
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set_winsock_errno ();
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return -1;
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}
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else
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return 0;
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}
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else
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/* Some other type of file descriptor. */
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return execute_ioctl_hooks (remaining_list, primary, fd, request, arg);
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}
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static struct fd_hook fd_sockets_hook;
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static int initialized_sockets_version /* = 0 */;
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#endif /* WINDOWS_SOCKETS */
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int
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gl_sockets_startup (_GL_UNUSED int version)
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{
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#if WINDOWS_SOCKETS
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if (version > initialized_sockets_version)
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{
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WSADATA data;
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int err;
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err = WSAStartup (version, &data);
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if (err != 0)
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return 1;
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if (data.wVersion != version)
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{
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WSACleanup ();
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return 2;
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}
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if (initialized_sockets_version == 0)
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register_fd_hook (close_fd_maybe_socket, ioctl_fd_maybe_socket,
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&fd_sockets_hook);
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initialized_sockets_version = version;
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}
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#endif
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return 0;
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}
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int
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gl_sockets_cleanup (void)
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{
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#if WINDOWS_SOCKETS
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int err;
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initialized_sockets_version = 0;
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unregister_fd_hook (&fd_sockets_hook);
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err = WSACleanup ();
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if (err != 0)
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return 1;
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#endif
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return 0;
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}
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