1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
|
/* sockets.c --- wrappers for Windows socket functions
Copyright (C) 2008-2015 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by Simon Josefsson */
#include <config.h>
/* Specification. */
#include "sockets.h"
#if WINDOWS_SOCKETS
/* This includes winsock2.h on MinGW. */
# include <sys/socket.h>
# include "fd-hook.h"
# include "msvc-nothrow.h"
/* Get set_winsock_errno, FD_TO_SOCKET etc. */
# include "w32sock.h"
static int
close_fd_maybe_socket (const struct fd_hook *remaining_list,
gl_close_fn primary,
int fd)
{
/* Note about multithread-safety: There is a race condition where, between
our calls to closesocket() and the primary close(), some other thread
could make system calls that allocate precisely the same HANDLE value
as sock; then the primary close() would call CloseHandle() on it. */
SOCKET sock;
WSANETWORKEVENTS ev;
/* Test whether fd refers to a socket. */
sock = FD_TO_SOCKET (fd);
ev.lNetworkEvents = 0xDEADBEEF;
WSAEnumNetworkEvents (sock, NULL, &ev);
if (ev.lNetworkEvents != 0xDEADBEEF)
{
/* fd refers to a socket. */
/* FIXME: other applications, like squid, use an undocumented
_free_osfhnd free function. But this is not enough: The 'osfile'
flags for fd also needs to be cleared, but it is hard to access it.
Instead, here we just close twice the file descriptor. */
if (closesocket (sock))
{
set_winsock_errno ();
return -1;
}
else
{
/* This call frees the file descriptor and does a
CloseHandle ((HANDLE) _get_osfhandle (fd)), which fails. */
_close (fd);
return 0;
}
}
else
/* Some other type of file descriptor. */
return execute_close_hooks (remaining_list, primary, fd);
}
static int
ioctl_fd_maybe_socket (const struct fd_hook *remaining_list,
gl_ioctl_fn primary,
int fd, int request, void *arg)
{
SOCKET sock;
WSANETWORKEVENTS ev;
/* Test whether fd refers to a socket. */
sock = FD_TO_SOCKET (fd);
ev.lNetworkEvents = 0xDEADBEEF;
WSAEnumNetworkEvents (sock, NULL, &ev);
if (ev.lNetworkEvents != 0xDEADBEEF)
{
/* fd refers to a socket. */
if (ioctlsocket (sock, request, arg) < 0)
{
set_winsock_errno ();
return -1;
}
else
return 0;
}
else
/* Some other type of file descriptor. */
return execute_ioctl_hooks (remaining_list, primary, fd, request, arg);
}
static struct fd_hook fd_sockets_hook;
static int initialized_sockets_version /* = 0 */;
#endif /* WINDOWS_SOCKETS */
int
gl_sockets_startup (int version _GL_UNUSED)
{
#if WINDOWS_SOCKETS
if (version > initialized_sockets_version)
{
WSADATA data;
int err;
err = WSAStartup (version, &data);
if (err != 0)
return 1;
if (data.wVersion < version)
return 2;
if (initialized_sockets_version == 0)
register_fd_hook (close_fd_maybe_socket, ioctl_fd_maybe_socket,
&fd_sockets_hook);
initialized_sockets_version = version;
}
#endif
return 0;
}
int
gl_sockets_cleanup (void)
{
#if WINDOWS_SOCKETS
int err;
initialized_sockets_version = 0;
unregister_fd_hook (&fd_sockets_hook);
err = WSACleanup ();
if (err != 0)
return 1;
#endif
return 0;
}
|
