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/*
Copyright (c) 2007-2011 iMatix Corporation
Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
This file is part of 0MQ.
0MQ 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 3 of the License, or
(at your option) any later version.
0MQ 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 <new>
#include <string.h>
#include "platform.hpp"
#include "tcp_listener.hpp"
#include "stream_engine.hpp"
#include "io_thread.hpp"
#include "session.hpp"
#include "config.hpp"
#include "err.hpp"
#include "ip.hpp"
#ifdef ZMQ_HAVE_WINDOWS
#include "windows.hpp"
#else
#include <unistd.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/tcp.h>
#include <netinet/in.h>
#include <netdb.h>
#include <fcntl.h>
#endif
#ifdef ZMQ_HAVE_OPENVMS
#include <ioctl.h>
#endif
zmq::tcp_listener_t::tcp_listener_t (io_thread_t *io_thread_,
socket_base_t *socket_, const options_t &options_) :
own_t (io_thread_, options_),
io_object_t (io_thread_),
has_file (false),
s (retired_fd),
socket (socket_)
{
}
zmq::tcp_listener_t::~tcp_listener_t ()
{
if (s != retired_fd)
close ();
}
void zmq::tcp_listener_t::process_plug ()
{
// Start polling for incoming connections.
handle = add_fd (s);
set_pollin (handle);
}
void zmq::tcp_listener_t::process_term (int linger_)
{
rm_fd (handle);
own_t::process_term (linger_);
}
void zmq::tcp_listener_t::in_event ()
{
fd_t fd = accept ();
// If connection was reset by the peer in the meantime, just ignore it.
// TODO: Handle specific errors like ENFILE/EMFILE etc.
if (fd == retired_fd)
return;
tune_tcp_socket (fd);
// Create the engine object for this connection.
stream_engine_t *engine = new (std::nothrow) stream_engine_t (fd, options);
alloc_assert (engine);
// Choose I/O thread to run connecter in. Given that we are already
// running in an I/O thread, there must be at least one available.
io_thread_t *io_thread = choose_io_thread (options.affinity);
zmq_assert (io_thread);
// Create and launch a session object.
session_t *session = new (std::nothrow)
session_t (io_thread, false, socket, options, NULL, NULL);
alloc_assert (session);
session->inc_seqnum ();
launch_child (session);
send_attach (session, engine, false);
}
void zmq::tcp_listener_t::close ()
{
zmq_assert (s != retired_fd);
#ifdef ZMQ_HAVE_WINDOWS
int rc = closesocket (s);
wsa_assert (rc != SOCKET_ERROR);
#else
int rc = ::close (s);
errno_assert (rc == 0);
#endif
s = retired_fd;
}
int zmq::tcp_listener_t::set_address (const char *addr_)
{
// Convert the textual address into address structure.
int rc = address.resolve (addr_, true, options.ipv4only ? true : false);
if (rc != 0)
return -1;
// Create a listening socket.
s = open_socket (address.family (), SOCK_STREAM, IPPROTO_TCP);
#ifdef ZMQ_HAVE_WINDOWS
if (s == INVALID_SOCKET)
wsa_error_to_errno ();
#endif
// IPv6 address family not supported, try automatic downgrade to IPv4.
if (address.family () == AF_INET6 && errno == EAFNOSUPPORT &&
!options.ipv4only) {
rc = address.resolve (addr_, true, true);
if (rc != 0)
return rc;
s = ::socket (address.family (), SOCK_STREAM, IPPROTO_TCP);
}
#ifdef ZMQ_HAVE_WINDOWS
if (s == INVALID_SOCKET) {
wsa_error_to_errno ();
return -1;
}
#else
if (s == -1)
return -1;
#endif
// On some systems, IPv4 mapping in IPv6 sockets is disabled by default.
// Switch it on in such cases.
if (address.family () == AF_INET6)
enable_ipv4_mapping (s);
// Allow reusing of the address.
int flag = 1;
#ifdef ZMQ_HAVE_WINDOWS
rc = setsockopt (s, SOL_SOCKET, SO_EXCLUSIVEADDRUSE,
(const char*) &flag, sizeof (int));
wsa_assert (rc != SOCKET_ERROR);
#else
rc = setsockopt (s, SOL_SOCKET, SO_REUSEADDR, &flag, sizeof (int));
errno_assert (rc == 0);
#endif
// Bind the socket to the network interface and port.
rc = bind (s, address.addr (), address.addrlen ());
#ifdef ZMQ_HAVE_WINDOWS
if (rc == SOCKET_ERROR) {
wsa_error_to_errno ();
return -1;
}
#else
if (rc != 0)
return -1;
#endif
// Listen for incomming connections.
rc = listen (s, options.backlog);
#ifdef ZMQ_HAVE_WINDOWS
if (rc == SOCKET_ERROR) {
wsa_error_to_errno ();
return -1;
}
#else
if (rc != 0)
return -1;
#endif
return 0;
}
zmq::fd_t zmq::tcp_listener_t::accept ()
{
// Accept one connection and deal with different failure modes.
zmq_assert (s != retired_fd);
fd_t sock = ::accept (s, NULL, NULL);
#ifdef ZMQ_HAVE_WINDOWS
if (sock == INVALID_SOCKET) {
wsa_assert (WSAGetLastError () == WSAEWOULDBLOCK ||
WSAGetLastError () == WSAECONNRESET);
return retired_fd;
}
#else
if (sock == -1) {
errno_assert (errno == EAGAIN || errno == EWOULDBLOCK ||
errno == EINTR || errno == ECONNABORTED || errno == EPROTO ||
errno == ENOBUFS);
return retired_fd;
}
#endif
return sock;
}
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