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sockets.c

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1/* sockets.c --- wrappers for Windows socket functions-
2-
3 Copyright (C) 2008-2018 Free Software Foundation, Inc.-
4-
5 This program is free software: you can redistribute it and/or modify-
6 it under the terms of the GNU General Public License as published by-
7 the Free Software Foundation; either version 3 of the License, or-
8 (at your option) any later version.-
9-
10 This program is distributed in the hope that it will be useful,-
11 but WITHOUT ANY WARRANTY; without even the implied warranty of-
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the-
13 GNU General Public License for more details.-
14-
15 You should have received a copy of the GNU General Public License-
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */-
17-
18/* Written by Simon Josefsson */-
19-
20#include <config.h>-
21-
22/* Specification. */-
23#include "sockets.h"-
24-
25#if WINDOWS_SOCKETS-
26-
27/* This includes winsock2.h on MinGW. */-
28# include <sys/socket.h>-
29-
30# include "fd-hook.h"-
31# if GNULIB_MSVC_NOTHROW-
32# include "msvc-nothrow.h"-
33# else-
34# include <io.h>-
35# endif-
36-
37/* Get set_winsock_errno, FD_TO_SOCKET etc. */-
38# include "w32sock.h"-
39-
40static int-
41close_fd_maybe_socket (const struct fd_hook *remaining_list,-
42 gl_close_fn primary,-
43 int fd)-
44{-
45 /* Note about multithread-safety: There is a race condition where, between-
46 our calls to closesocket() and the primary close(), some other thread-
47 could make system calls that allocate precisely the same HANDLE value-
48 as sock; then the primary close() would call CloseHandle() on it. */-
49 SOCKET sock;-
50 WSANETWORKEVENTS ev;-
51-
52 /* Test whether fd refers to a socket. */-
53 sock = FD_TO_SOCKET (fd);-
54 ev.lNetworkEvents = 0xDEADBEEF;-
55 WSAEnumNetworkEvents (sock, NULL, &ev);-
56 if (ev.lNetworkEvents != 0xDEADBEEF)-
57 {-
58 /* fd refers to a socket. */-
59 /* FIXME: other applications, like squid, use an undocumented-
60 _free_osfhnd free function. But this is not enough: The 'osfile'-
61 flags for fd also needs to be cleared, but it is hard to access it.-
62 Instead, here we just close twice the file descriptor. */-
63 if (closesocket (sock))-
64 {-
65 set_winsock_errno ();-
66 return -1;-
67 }-
68 else-
69 {-
70 /* This call frees the file descriptor and does a-
71 CloseHandle ((HANDLE) _get_osfhandle (fd)), which fails. */-
72 _close (fd);-
73 return 0;-
74 }-
75 }-
76 else-
77 /* Some other type of file descriptor. */-
78 return execute_close_hooks (remaining_list, primary, fd);-
79}-
80-
81static int-
82ioctl_fd_maybe_socket (const struct fd_hook *remaining_list,-
83 gl_ioctl_fn primary,-
84 int fd, int request, void *arg)-
85{-
86 SOCKET sock;-
87 WSANETWORKEVENTS ev;-
88-
89 /* Test whether fd refers to a socket. */-
90 sock = FD_TO_SOCKET (fd);-
91 ev.lNetworkEvents = 0xDEADBEEF;-
92 WSAEnumNetworkEvents (sock, NULL, &ev);-
93 if (ev.lNetworkEvents != 0xDEADBEEF)-
94 {-
95 /* fd refers to a socket. */-
96 if (ioctlsocket (sock, request, arg) < 0)-
97 {-
98 set_winsock_errno ();-
99 return -1;-
100 }-
101 else-
102 return 0;-
103 }-
104 else-
105 /* Some other type of file descriptor. */-
106 return execute_ioctl_hooks (remaining_list, primary, fd, request, arg);-
107}-
108-
109static struct fd_hook fd_sockets_hook;-
110-
111static int initialized_sockets_version /* = 0 */;-
112-
113#endif /* WINDOWS_SOCKETS */-
114-
115int-
116gl_sockets_startup (int version _GL_UNUSED)-
117{-
118#if WINDOWS_SOCKETS-
119 if (version > initialized_sockets_version)-
120 {-
121 WSADATA data;-
122 int err;-
123-
124 err = WSAStartup (version, &data);-
125 if (err != 0)-
126 return 1;-
127-
128 if (data.wVersion != version)-
129 {-
130 WSACleanup ();-
131 return 2;-
132 }-
133-
134 if (initialized_sockets_version == 0)-
135 register_fd_hook (close_fd_maybe_socket, ioctl_fd_maybe_socket,-
136 &fd_sockets_hook);-
137-
138 initialized_sockets_version = version;-
139 }-
140#endif-
141-
142 return 0;
never executed: return 0;
0
143}-
144-
145int-
146gl_sockets_cleanup (void)-
147{-
148#if WINDOWS_SOCKETS-
149 int err;-
150-
151 initialized_sockets_version = 0;-
152-
153 unregister_fd_hook (&fd_sockets_hook);-
154-
155 err = WSACleanup ();-
156 if (err != 0)-
157 return 1;-
158#endif-
159-
160 return 0;
never executed: return 0;
0
161}-
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