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257 lines (230 loc) · 11.1 KB
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/******************************************************************************\
* ___ __ *
* /\_ \ __/\ \ *
* \//\ \ /\_\ \ \____ ___ _____ _____ __ *
* \ \ \ \/\ \ \ '__`\ /'___\/\ '__`\/\ '__`\ /'__`\ *
* \_\ \_\ \ \ \ \L\ \/\ \__/\ \ \L\ \ \ \L\ \/\ \L\.\_ *
* /\____\\ \_\ \_,__/\ \____\\ \ ,__/\ \ ,__/\ \__/.\_\ *
* \/____/ \/_/\/___/ \/____/ \ \ \/ \ \ \/ \/__/\/_/ *
* \ \_\ \ \_\ *
* \/_/ \/_/ *
* *
* Copyright (C) 2011-2013 *
* Dominik Charousset <dominik.charousset@haw-hamburg.de> *
* *
* This file is part of libcppa. *
* libcppa 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. *
* *
* libcppa 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 libcppa. If not, see <http://www.gnu.org/licenses/>. *
\******************************************************************************/
#include <ios>
#include <sstream>
#include <cstring>
#include "cppa/config.hpp"
#include "cppa/exception.hpp"
#ifdef CPPA_WINDOWS
# include <winsock2.h>
# include <ws2tcpip.h> /* socklen_t, et al (MSVC20xx) */
# include <windows.h>
# include <io.h>
#else
# include <sys/types.h>
# include <sys/socket.h>
# include <errno.h>
# include <netdb.h>
# include <fcntl.h>
# include <netinet/in.h>
# include <netinet/tcp.h>
#endif
#include "cppa/util/scope_guard.hpp"
#include "cppa/detail/fd_util.hpp"
/************** implementation of platform-independent functions **************/
namespace cppa { namespace detail { namespace fd_util {
void throw_io_failure(const char* what, bool add_errno_failure) {
if (add_errno_failure) {
std::ostringstream oss;
oss << what << ": " << last_socket_error_as_string()
<< " [errno: " << last_socket_error() << "]";
throw std::ios_base::failure(oss.str());
}
throw std::ios_base::failure(what);
}
void tcp_nodelay(native_socket_type fd, bool new_value) {
int flag = new_value ? 1 : 0;
if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY,
reinterpret_cast<setsockopt_ptr>(&flag), sizeof(flag)) < 0) {
throw_io_failure("unable to set TCP_NODELAY");
}
}
void handle_io_result(ssize_t res, bool is_nonblock, const char* msg) {
if (res < 0) {
auto err = last_socket_error();
if (is_nonblock && would_block_or_temporarily_unavailable(err)) {
// don't throw for 'failed' non-blocking IO,
// just try again later
}
else throw_io_failure(msg);
}
}
void handle_write_result(ssize_t res, bool is_nonblock) {
handle_io_result(res, is_nonblock, "cannot write to file descriptor");
}
void handle_read_result(ssize_t res, bool is_nonblock) {
handle_io_result(res, is_nonblock, "cannot read from file descriptor");
if (res == 0) throw_io_failure("cannot read from closed file descriptor");
}
} } } // namespace cppa::detail::fd_util
#ifndef CPPA_WINDOWS // Linux or Mac OS
namespace cppa { namespace detail { namespace fd_util {
std::string last_socket_error_as_string() {
return strerror(errno);
}
void nonblocking(native_socket_type fd, bool new_value) {
// read flags for fd
auto rf = fcntl(fd, F_GETFL, 0);
if (rf == -1) throw_io_failure("unable to read socket flags");
// calculate and set new flags
auto wf = new_value ? (rf | O_NONBLOCK) : (rf & (~(O_NONBLOCK)));
if (fcntl(fd, F_SETFL, wf) < 0) {
throw_io_failure("unable to set file descriptor flags");
}
}
std::pair<native_socket_type, native_socket_type> create_pipe() {
native_socket_type pipefds[2];
if (pipe(pipefds) != 0) { CPPA_CRITICAL("cannot create pipe"); }
return {pipefds[0], pipefds[1]};
}
} } } // namespace cppa::detail::fd_util
#else // CPPA_WINDOWS
namespace cppa { namespace detail { namespace fd_util {
std::string last_socket_error_as_string() {
LPTSTR errorText = NULL;
auto hresult = last_socket_error();
FormatMessage(// use system message tables to retrieve error text
FORMAT_MESSAGE_FROM_SYSTEM
// allocate buffer on local heap for error text
| FORMAT_MESSAGE_ALLOCATE_BUFFER
// Important! will fail otherwise, since we're not
// (and CANNOT) pass insertion parameters
| FORMAT_MESSAGE_IGNORE_INSERTS,
nullptr, // unused with FORMAT_MESSAGE_FROM_SYSTEM
hresult,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &errorText, // output
0, // minimum size for output buffer
nullptr); // arguments - see note
std::string result;
if (errorText != nullptr) {
result = errorText;
// release memory allocated by FormatMessage()
LocalFree(errorText);
}
return result;
}
void nonblocking(native_socket_type fd, bool new_value) {
u_long mode = new_value ? 1 : 0;
if (ioctlsocket(fd, FIONBIO, &mode) < 0) {
throw_io_failure("unable to set FIONBIO");
}
}
// wraps a C call and throws an IO failure if f returns an integer != 0
template<typename F, typename... Ts>
inline void ccall(const char* errmsg, F f, Ts&&... args) {
if (f(std::forward<Ts>(args)...) != 0) {
throw_io_failure(errmsg);
}
}
/******************************************************************************\
* Based on work of others; *
* original header: *
* *
* Copyright 2007, 2010 by Nathan C. Myers <ncm@cantrip.org> *
* Redistribution and use in source and binary forms, with or without *
* modification, are permitted provided that the following conditions are met:*
* *
* Redistributions of source code must retain the above copyright notice, *
* this list of conditions and the following disclaimer. *
* *
* Redistributions in binary form must reproduce the above copyright notice, *
* this list of conditions and the following disclaimer in the documentation *
* and/or other materials provided with the distribution. *
* *
* The name of the author must not be used to endorse or promote products *
* derived from this software without specific prior written permission. *
* *
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS *
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED *
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR *
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR *
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, *
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, *
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;*
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, *
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR *
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF *
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
\******************************************************************************/
std::pair<native_socket_type, native_socket_type> create_pipe() {
socklen_t addrlen = sizeof(sockaddr_in);
native_socket_type socks[2] = {invalid_socket, invalid_socket};
auto listener = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (listener == invalid_socket) throw_io_failure("socket() failed");
union {
sockaddr_in inaddr;
sockaddr addr;
} a;
memset(&a, 0, sizeof(a));
a.inaddr.sin_family = AF_INET;
a.inaddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
a.inaddr.sin_port = 0;
bool success = false;
// makes sure all sockets are closed in case of an error
auto guard = util::make_scope_guard([&] {
if (success) return; // everyhting's fine
auto e = WSAGetLastError();
closesocket(listener);
closesocket(socks[0]);
closesocket(socks[1]);
WSASetLastError(e);
});
// bind listener to a local port
int reuse = 1;
ccall("setsockopt() failed", ::setsockopt, listener,
SOL_SOCKET, SO_REUSEADDR, reinterpret_cast<char*>(&reuse),
static_cast<socklen_t>(sizeof(reuse)));
ccall("bind() failed", ::bind, listener, &a.addr, sizeof(a.inaddr));
// read the port in use: win32 getsockname may only set the port number
// (http://msdn.microsoft.com/library/ms738543.aspx):
memset(&a, 0, sizeof(a));
ccall("getsockname() failed", ::getsockname, listener, &a.addr, &addrlen);
a.inaddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
a.inaddr.sin_family = AF_INET;
// set listener to listen mode
ccall("listen() failed", ::listen, listener, 1);
// create read-only end of the pipe
DWORD flags = 0;
auto read_fd = WSASocket(AF_INET, SOCK_STREAM, 0, NULL, 0, flags);
if (read_fd == invalid_socket) {
throw_io_failure("cannot create read handle: WSASocket() failed");
}
ccall("connect() failed", ::connect, read_fd, &a.addr, sizeof(a.inaddr));
// get write-only end of the pipe
auto write_fd = accept(listener, NULL, NULL);
if (write_fd == invalid_socket) {
throw_io_failure("cannot create write handle: accept() failed");
}
closesocket(listener);
success = true;
return {read_fd, write_fd};
}
} } } // namespace cppa::detail::fd_util
#endif
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