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/*
Copyright (c) 2007-2016 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 "precompiled.hpp"
#include "vmci_listener.hpp"
#if defined ZMQ_HAVE_VMCI
#include <new>
#include "stream_engine.hpp"
#include "vmci_address.hpp"
#include "io_thread.hpp"
#include "session_base.hpp"
#include "config.hpp"
#include "err.hpp"
#include "ip.hpp"
#include "socket_base.hpp"
#include "vmci.hpp"
#if defined ZMQ_HAVE_WINDOWS
#include "windows.hpp"
#else
#include <unistd.h>
#include <fcntl.h>
#endif
zmq::vmci_listener_t::vmci_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_),
s (retired_fd),
socket (socket_)
{
}
zmq::vmci_listener_t::~vmci_listener_t ()
{
zmq_assert (s == retired_fd);
}
void zmq::vmci_listener_t::process_plug ()
{
// Start polling for incoming connections.
handle = add_fd (s);
set_pollin (handle);
}
void zmq::vmci_listener_t::process_term (int linger_)
{
rm_fd (handle);
close ();
own_t::process_term (linger_);
}
void zmq::vmci_listener_t::in_event ()
{
fd_t fd = accept ();
// If connection was reset by the peer in the meantime, just ignore it.
if (fd == retired_fd) {
socket->event_accept_failed (
make_unconnected_bind_endpoint_pair (endpoint), zmq_errno ());
return;
}
tune_vmci_buffer_size (this->get_ctx (), fd, options.vmci_buffer_size,
options.vmci_buffer_min_size,
options.vmci_buffer_max_size);
if (options.vmci_connect_timeout > 0) {
#if defined ZMQ_HAVE_WINDOWS
tune_vmci_connect_timeout (this->get_ctx (), fd,
options.vmci_connect_timeout);
#else
struct timeval timeout = {0, options.vmci_connect_timeout * 1000};
tune_vmci_connect_timeout (this->get_ctx (), fd, timeout);
#endif
}
// Create the engine object for this connection.
stream_engine_t *engine = new (std::nothrow) stream_engine_t (
fd, options, make_unconnected_bind_endpoint_pair (endpoint));
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_base_t *session =
session_base_t::create (io_thread, false, socket, options, NULL);
errno_assert (session);
session->inc_seqnum ();
launch_child (session);
send_attach (session, engine, false);
socket->event_accepted (make_unconnected_bind_endpoint_pair (endpoint), fd);
}
int zmq::vmci_listener_t::get_local_address (std::string &addr_)
{
struct sockaddr_storage ss;
#ifdef ZMQ_HAVE_HPUX
int sl = sizeof (ss);
#else
socklen_t sl = sizeof (ss);
#endif
int rc = getsockname (s, (sockaddr *) &ss, &sl);
if (rc != 0) {
addr_.clear ();
return rc;
}
vmci_address_t addr ((struct sockaddr *) &ss, sl, this->get_ctx ());
return addr.to_string (addr_);
}
int zmq::vmci_listener_t::set_local_address (const char *addr_)
{
// Create addr on stack for auto-cleanup
std::string addr (addr_);
// Initialise the address structure.
vmci_address_t address (this->get_ctx ());
int rc = address.resolve (addr.c_str ());
if (rc != 0)
return -1;
// Create a listening socket.
s =
open_socket (this->get_ctx ()->get_vmci_socket_family (), SOCK_STREAM, 0);
#ifdef ZMQ_HAVE_WINDOWS
if (s == INVALID_SOCKET) {
errno = wsa_error_to_errno (WSAGetLastError ());
return -1;
}
#if !defined _WIN32_WCE
// On Windows, preventing sockets to be inherited by child processes.
BOOL brc = SetHandleInformation ((HANDLE) s, HANDLE_FLAG_INHERIT, 0);
win_assert (brc);
#endif
#else
if (s == -1)
return -1;
#endif
address.to_string (endpoint);
// Bind the socket.
rc = bind (s, address.addr (), address.addrlen ());
#ifdef ZMQ_HAVE_WINDOWS
if (rc == SOCKET_ERROR) {
errno = wsa_error_to_errno (WSAGetLastError ());
goto error;
}
#else
if (rc != 0)
goto error;
#endif
// Listen for incoming connections.
rc = listen (s, options.backlog);
#ifdef ZMQ_HAVE_WINDOWS
if (rc == SOCKET_ERROR) {
errno = wsa_error_to_errno (WSAGetLastError ());
goto error;
}
#else
if (rc != 0)
goto error;
#endif
socket->event_listening (make_unconnected_bind_endpoint_pair (endpoint), s);
return 0;
error:
int err = errno;
close ();
errno = err;
return -1;
}
void zmq::vmci_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
socket->event_closed (make_unconnected_bind_endpoint_pair (endpoint), s);
s = retired_fd;
}
zmq::fd_t zmq::vmci_listener_t::accept ()
{
// Accept one connection and deal with different failure modes.
// The situation where connection cannot be accepted due to insufficient
// resources is considered valid and treated by ignoring the connection.
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
|| WSAGetLastError () == WSAEMFILE
|| WSAGetLastError () == WSAENOBUFS);
return retired_fd;
}
#if !defined _WIN32_WCE
// On Windows, preventing sockets to be inherited by child processes.
BOOL brc = SetHandleInformation ((HANDLE) sock, HANDLE_FLAG_INHERIT, 0);
win_assert (brc);
#endif
#else
if (sock == -1) {
errno_assert (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR
|| errno == ECONNABORTED || errno == EPROTO
|| errno == ENOBUFS || errno == ENOMEM || errno == EMFILE
|| errno == ENFILE);
return retired_fd;
}
#endif
// Race condition can cause socket not to be closed (if fork happens
// between accept and this point).
#ifdef FD_CLOEXEC
int rc = fcntl (sock, F_SETFD, FD_CLOEXEC);
errno_assert (rc != -1);
#endif
return sock;
}
#endif