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/*
Copyright (c) 2007-2015 Contributors as noted in the AUTHORS file
This file is part of libzmq, the ZeroMQ core engine in C++.
libzmq is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
As a special exception, the Contributors give you permission to link
this library with independent modules to produce an executable,
regardless of the license terms of these independent modules, and to
copy and distribute the resulting executable under terms of your choice,
provided that you also meet, for each linked independent module, the
terms and conditions of the license of that module. An independent
module is a module which is not derived from or based on this library.
If you modify this library, you must extend this exception to your
version of the library.
libzmq 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 <http://www.gnu.org/licenses/>.
*/
#include "ip.hpp"
#include "err.hpp"
#include "platform.hpp"
#if defined ZMQ_HAVE_WINDOWS
#include "windows.hpp"
#else
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#endif
#if defined ZMQ_HAVE_OPENVMS
#include <ioctl.h>
#endif
zmq::fd_t zmq::open_socket (int domain_, int type_, int protocol_)
{
// Setting this option result in sane behaviour when exec() functions
// are used. Old sockets are closed and don't block TCP ports etc.
#if defined ZMQ_HAVE_SOCK_CLOEXEC
type_ |= SOCK_CLOEXEC;
#endif
fd_t s = socket (domain_, type_, protocol_);
#ifdef ZMQ_HAVE_WINDOWS
if (s == INVALID_SOCKET)
return INVALID_SOCKET;
#else
if (s == -1)
return -1;
#endif
// If there's no SOCK_CLOEXEC, let's try the second best option. Note that
// race condition can cause socket not to be closed (if fork happens
// between socket creation and this point).
#if !defined ZMQ_HAVE_SOCK_CLOEXEC && defined FD_CLOEXEC
int rc = fcntl (s, F_SETFD, FD_CLOEXEC);
errno_assert (rc != -1);
#endif
// On Windows, preventing sockets to be inherited by child processes.
#if defined ZMQ_HAVE_WINDOWS && defined HANDLE_FLAG_INHERIT
BOOL brc = SetHandleInformation ((HANDLE) s, HANDLE_FLAG_INHERIT, 0);
win_assert (brc);
#endif
return s;
}
void zmq::unblock_socket (fd_t s_)
{
#if defined ZMQ_HAVE_WINDOWS
u_long nonblock = 1;
int rc = ioctlsocket (s_, FIONBIO, &nonblock);
wsa_assert (rc != SOCKET_ERROR);
#elif defined ZMQ_HAVE_OPENVMS
int nonblock = 1;
int rc = ioctl (s_, FIONBIO, &nonblock);
errno_assert (rc != -1);
#else
int flags = fcntl (s_, F_GETFL, 0);
if (flags == -1)
flags = 0;
int rc = fcntl (s_, F_SETFL, flags | O_NONBLOCK);
errno_assert (rc != -1);
#endif
}
void zmq::enable_ipv4_mapping (fd_t s_)
{
(void) s_;
#ifdef IPV6_V6ONLY
#ifdef ZMQ_HAVE_WINDOWS
DWORD flag = 0;
#else
int flag = 0;
#endif
int rc = setsockopt (s_, IPPROTO_IPV6, IPV6_V6ONLY, (const char*) &flag,
sizeof (flag));
#ifdef ZMQ_HAVE_WINDOWS
wsa_assert (rc != SOCKET_ERROR);
#else
errno_assert (rc == 0);
#endif
#endif
}
int zmq::get_peer_ip_address (fd_t sockfd_, std::string &ip_addr_)
{
int rc;
struct sockaddr_storage ss;
#if defined ZMQ_HAVE_HPUX || defined ZMQ_HAVE_WINDOWS
int addrlen = static_cast <int> (sizeof ss);
#else
socklen_t addrlen = sizeof ss;
#endif
rc = getpeername (sockfd_, (struct sockaddr*) &ss, &addrlen);
#ifdef ZMQ_HAVE_WINDOWS
if (rc == SOCKET_ERROR) {
wsa_assert (WSAGetLastError () != WSANOTINITIALISED &&
WSAGetLastError () != WSAEFAULT &&
WSAGetLastError () != WSAEINPROGRESS &&
WSAGetLastError () != WSAENOTSOCK);
return 0;
}
#else
if (rc == -1) {
errno_assert (errno != EBADF &&
errno != EFAULT &&
errno != ENOTSOCK);
return 0;
}
#endif
char host [NI_MAXHOST];
rc = getnameinfo ((struct sockaddr*) &ss, addrlen, host, sizeof host,
NULL, 0, NI_NUMERICHOST);
if (rc != 0)
return 0;
ip_addr_ = host;
union {
struct sockaddr sa;
struct sockaddr_storage sa_stor;
} u;
u.sa_stor = ss;
return (int) u.sa.sa_family;
}
void zmq::set_ip_type_of_service (fd_t s_, int iptos)
{
int rc = setsockopt(s_, IPPROTO_IP, IP_TOS, reinterpret_cast<const char*>(&iptos), sizeof(iptos));
#ifdef ZMQ_HAVE_WINDOWS
wsa_assert (rc != SOCKET_ERROR);
#else
errno_assert (rc == 0);
#endif
}
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