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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
/*
* Copyright (C) 2010-2016 Free Software Foundation, Inc.
* Copyright (C) 2015-2016 Red Hat, Inc.
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GnuTLS.
*
* The GnuTLS is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>
*
*/
#include <config.h>
#include <system.h>
#include "gnutls_int.h"
#include "errors.h"
#include <sys/socket.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#ifdef _WIN32
# include <windows.h>
#else /* !_WIN32 */
# include <poll.h>
#endif
/* System specific socket function wrappers.
*/
#ifdef _WIN32
/* Do not use the gnulib functions for sending and receiving data.
* Using them makes gnutls only working with gnulib applications.
*/
#undef send
#undef recv
#undef select
int system_errno(gnutls_transport_ptr p)
{
int tmperr = WSAGetLastError();
int ret = 0;
switch (tmperr) {
case WSAEWOULDBLOCK:
ret = EAGAIN;
break;
case NO_ERROR:
ret = 0;
break;
case WSAEINTR:
ret = EINTR;
break;
case WSAEMSGSIZE:
ret = EMSGSIZE;
break;
default:
ret = EIO;
break;
}
WSASetLastError(tmperr);
return ret;
}
ssize_t
system_write(gnutls_transport_ptr ptr, const void *data, size_t data_size)
{
return send(GNUTLS_POINTER_TO_INT(ptr), data, data_size, 0);
}
ssize_t
system_writev(gnutls_transport_ptr_t ptr, const giovec_t * iovec,
int iovec_cnt)
{
WSABUF bufs[32];
DWORD bytes_sent;
DWORD to_send_cnt = 0;
size_t to_send_bytes = 0;
if ((size_t)iovec_cnt > sizeof(bufs) / sizeof(bufs[0]))
iovec_cnt = sizeof(bufs) / sizeof(bufs[0]);
while (to_send_cnt < (DWORD)iovec_cnt && to_send_bytes < SSIZE_MAX) {
bufs[to_send_cnt].buf = iovec[to_send_cnt].iov_base;
if (to_send_bytes + iovec[to_send_cnt].iov_len > SSIZE_MAX) {
/* Return value limit: successful result value cannot
* exceed SSIZE_MAX */
size_t space_left = (size_t)SSIZE_MAX - to_send_bytes;
bufs[to_send_cnt].len = (unsigned long)
(space_left > ULONG_MAX ?
ULONG_MAX : space_left);
to_send_cnt++;
break;
}
#ifdef _WIN64
if (iovec[to_send_cnt].iov_len > ULONG_MAX) {
/* WSASend() limitation */
bufs[to_send_cnt].len = ULONG_MAX;
to_send_cnt++;
break;
}
#endif
bufs[to_send_cnt].len =
(unsigned long) iovec[to_send_cnt].iov_len;
to_send_bytes += iovec[to_send_cnt].iov_len;
to_send_cnt++;
}
if (WSASend(GNUTLS_POINTER_TO_INT(ptr), bufs, to_send_cnt, &bytes_sent,
0, NULL, NULL) != 0)
return -1;
return (ssize_t)bytes_sent;
}
#else /* POSIX */
int system_errno(gnutls_transport_ptr_t ptr)
{
#if defined(_AIX) || defined(AIX)
if (errno == 0)
errno = EAGAIN;
#endif
return errno;
}
static ssize_t
_system_writev(gnutls_transport_ptr_t ptr, const giovec_t * iovec,
int iovec_cnt, int flags)
{
struct msghdr hdr;
memset(&hdr, 0, sizeof(hdr));
hdr.msg_iov = (struct iovec *)iovec;
hdr.msg_iovlen = iovec_cnt;
return sendmsg(GNUTLS_POINTER_TO_INT(ptr), &hdr, flags);
}
#ifdef MSG_NOSIGNAL
ssize_t
system_writev_nosignal(gnutls_transport_ptr_t ptr, const giovec_t * iovec,
int iovec_cnt)
{
return _system_writev(ptr, iovec, iovec_cnt, MSG_NOSIGNAL);
}
#endif
ssize_t
system_writev(gnutls_transport_ptr_t ptr, const giovec_t * iovec,
int iovec_cnt)
{
return _system_writev(ptr, iovec, iovec_cnt, 0);
}
#endif
ssize_t
system_read(gnutls_transport_ptr_t ptr, void *data, size_t data_size)
{
return recv(GNUTLS_POINTER_TO_INT(ptr), data, data_size, 0);
}
/**
* gnutls_system_recv_timeout:
* @ptr: A file descriptor (wrapped in a gnutls_transport_ptr_t pointer)
* @ms: The number of milliseconds to wait.
*
* Wait for data to be received from the provided socket (@ptr) within a
* timeout period in milliseconds, using select() on the provided @ptr.
*
* This function is provided as a helper for constructing custom
* callbacks for gnutls_transport_set_pull_timeout_function(),
* which can be used if you rely on socket file descriptors.
*
* Returns -1 on error, 0 on timeout, positive value if data are available for reading.
*
* Since: 3.4.0
**/
int gnutls_system_recv_timeout(gnutls_transport_ptr_t ptr, unsigned int ms)
{
int ret;
int fd = GNUTLS_POINTER_TO_INT(ptr);
#ifndef _WIN32
int timeo;
struct pollfd pfd;
pfd.fd = fd;
pfd.events = POLLIN;
pfd.revents = 0;
if (ms == GNUTLS_INDEFINITE_TIMEOUT)
timeo = -1;
else
timeo = ms;
do {
ret = poll(&pfd, 1, timeo);
} while(ret == -1 && errno == EINTR);
#else
fd_set rfds;
struct timeval _tv, *tv = NULL;
FD_ZERO(&rfds);
FD_SET(fd, &rfds);
if (ms != GNUTLS_INDEFINITE_TIMEOUT) {
_tv.tv_sec = ms/1000;
_tv.tv_usec = (ms % 1000) * 1000;
tv = &_tv;
}
ret = select(fd + 1, &rfds, NULL, NULL, tv);
#endif
if (ret <= 0)
return ret;
return ret;
}
|
