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/*
* 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[iovec_cnt];
DWORD bytes_sent;
int to_send_cnt = 0;
size_t to_send_bytes = 0;
while (to_send_cnt < 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;
}
if (iovec[to_send_cnt].iov_len > ULONG_MAX) {
/* WSASend() limitation */
bufs[to_send_cnt].len = ULONG_MAX;
to_send_cnt++;
break;
}
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;
}
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