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-rw-r--r--src/ipc_listener.cpp351
1 files changed, 351 insertions, 0 deletions
diff --git a/src/ipc_listener.cpp b/src/ipc_listener.cpp
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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 "ipc_listener.hpp"
+#include "platform.hpp"
+#include "tcp_engine.hpp"
+#include "io_thread.hpp"
+#include "session.hpp"
+#include "config.hpp"
+#include "err.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>
+#ifndef ZMQ_HAVE_OPENVMS
+#include <sys/un.h>
+#else
+#include <ioctl.h>
+#endif
+#endif
+
+zmq::ipc_listener_t::ipc_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_)
+{
+ memset (&addr, 0, sizeof (addr));
+ addr_len = 0;
+}
+
+zmq::ipc_listener_t::~ipc_listener_t ()
+{
+ if (s != retired_fd)
+ close ();
+}
+
+void zmq::ipc_listener_t::process_plug ()
+{
+ // Start polling for incoming connections.
+ handle = add_fd (s);
+ set_pollin (handle);
+}
+
+void zmq::ipc_listener_t::process_term (int linger_)
+{
+ rm_fd (handle);
+ own_t::process_term (linger_);
+}
+
+void zmq::ipc_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;
+
+ // Create the engine object for this connection.
+ tcp_engine_t *engine = new (std::nothrow) tcp_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);
+}
+
+#ifdef ZMQ_HAVE_WINDOWS
+
+int zmq::ipc_listener_t::set_address (const char *protocol_, const char *addr_)
+{
+ // IPC protocol is not supported on Windows platform.
+ if (strcmp (protocol_, "tcp") != 0 ) {
+ errno = EPROTONOSUPPORT;
+ return -1;
+ }
+
+ // Convert the interface into sockaddr_in structure.
+ int rc = resolve_ip_interface (&addr, &addr_len, addr_);
+ if (rc != 0)
+ return rc;
+
+ // Create a listening socket.
+ s = ::socket (addr.ss_family, SOCK_STREAM, IPPROTO_TCP);
+ if (s == INVALID_SOCKET) {
+ wsa_error_to_errno ();
+ return -1;
+ }
+
+ // Allow reusing of the address.
+ int flag = 1;
+ rc = setsockopt (s, SOL_SOCKET, SO_EXCLUSIVEADDRUSE,
+ (const char*) &flag, sizeof (int));
+ wsa_assert (rc != SOCKET_ERROR);
+
+ // Bind the socket to the network interface and port.
+ rc = bind (s, (struct sockaddr*) &addr, addr_len);
+ if (rc == SOCKET_ERROR) {
+ wsa_error_to_errno ();
+ return -1;
+ }
+
+ // Listen for incomming connections.
+ rc = listen (s, options.backlog);
+ if (rc == SOCKET_ERROR) {
+ wsa_error_to_errno ();
+ return -1;
+ }
+
+ return 0;
+}
+
+int zmq::ipc_listener_t::close ()
+{
+ zmq_assert (s != retired_fd);
+ int rc = closesocket (s);
+ wsa_assert (rc != SOCKET_ERROR);
+ s = retired_fd;
+ return 0;
+}
+
+zmq::fd_t zmq::ipc_listener_t::accept ()
+{
+ zmq_assert (s != retired_fd);
+
+ // Accept one incoming connection.
+ fd_t sock = ::accept (s, NULL, NULL);
+ if (sock == INVALID_SOCKET &&
+ (WSAGetLastError () == WSAEWOULDBLOCK ||
+ WSAGetLastError () == WSAECONNRESET))
+ return retired_fd;
+
+ zmq_assert (sock != INVALID_SOCKET);
+
+ // Set to non-blocking mode.
+ unsigned long argp = 1;
+ int rc = ioctlsocket (sock, FIONBIO, &argp);
+ wsa_assert (rc != SOCKET_ERROR);
+
+ return sock;
+}
+
+#else
+
+int zmq::ipc_listener_t::set_address (const char *protocol_, const char *addr_)
+{
+ if (strcmp (protocol_, "tcp") == 0 ) {
+
+ // Resolve the sockaddr to bind to.
+ int rc = resolve_ip_interface (&addr, &addr_len, addr_);
+ if (rc != 0)
+ return -1;
+
+ // Create a listening socket.
+ s = ::socket (addr.ss_family, SOCK_STREAM, IPPROTO_TCP);
+ if (s == -1)
+ return -1;
+
+ // Allow reusing of the address.
+ int flag = 1;
+ rc = setsockopt (s, SOL_SOCKET, SO_REUSEADDR, &flag, sizeof (int));
+ errno_assert (rc == 0);
+
+ // Bind the socket to the network interface and port.
+ rc = bind (s, (struct sockaddr*) &addr, addr_len);
+ if (rc != 0) {
+ int err = errno;
+ if (close () != 0)
+ return -1;
+ errno = err;
+ return -1;
+ }
+
+ // Listen for incomming connections.
+ rc = listen (s, options.backlog);
+ if (rc != 0) {
+ int err = errno;
+ if (close () != 0)
+ return -1;
+ errno = err;
+ return -1;
+ }
+
+ return 0;
+ }
+#ifndef ZMQ_HAVE_OPENVMS
+ else if (strcmp (protocol_, "ipc") == 0) {
+
+ // Get rid of the file associated with the UNIX domain socket that
+ // may have been left behind by the previous run of the application.
+ ::unlink (addr_);
+
+ // Convert the address into sockaddr_un structure.
+ int rc = resolve_local_path (&addr, &addr_len, addr_);
+ if (rc != 0)
+ return -1;
+
+ // Create a listening socket.
+ s = ::socket (AF_UNIX, SOCK_STREAM, 0);
+ if (s == -1)
+ return -1;
+
+ // Set the non-blocking flag.
+ int flag = fcntl (s, F_GETFL, 0);
+ if (flag == -1)
+ flag = 0;
+ rc = fcntl (s, F_SETFL, flag | O_NONBLOCK);
+ errno_assert (rc != -1);
+
+ // Bind the socket to the file path.
+ rc = bind (s, (struct sockaddr*) &addr, addr_len);
+ if (rc != 0) {
+ int err = errno;
+ if (close () != 0)
+ return -1;
+ errno = err;
+ return -1;
+ }
+ has_file = true;
+
+ // Listen for incomming connections.
+ rc = listen (s, options.backlog);
+ if (rc != 0) {
+ int err = errno;
+ if (close () != 0)
+ return -1;
+ errno = err;
+ return -1;
+ }
+
+ return 0;
+ }
+#endif
+ else {
+ errno = EPROTONOSUPPORT;
+ return -1;
+ }
+}
+
+int zmq::ipc_listener_t::close ()
+{
+ zmq_assert (s != retired_fd);
+ int rc = ::close (s);
+ if (rc != 0)
+ return -1;
+ s = retired_fd;
+
+#ifndef ZMQ_HAVE_OPENVMS
+ // If there's an underlying UNIX domain socket, get rid of the file it
+ // is associated with.
+ struct sockaddr_un *su = (struct sockaddr_un*) &addr;
+ if (AF_UNIX == su->sun_family && has_file) {
+ rc = ::unlink(su->sun_path);
+ if (rc != 0)
+ return -1;
+ }
+#endif
+
+ return 0;
+}
+
+zmq::fd_t zmq::ipc_listener_t::accept ()
+{
+ zmq_assert (s != retired_fd);
+
+ // Accept one incoming connection.
+ fd_t sock = ::accept (s, NULL, NULL);
+
+#if (defined ZMQ_HAVE_LINUX || defined ZMQ_HAVE_FREEBSD || \
+ defined ZMQ_HAVE_OPENBSD || defined ZMQ_HAVE_OSX || \
+ defined ZMQ_HAVE_OPENVMS || defined ZMQ_HAVE_NETBSD || \
+ defined ZMQ_HAVE_CYGWIN)
+ if (sock == -1 &&
+ (errno == EAGAIN || errno == EWOULDBLOCK ||
+ errno == EINTR || errno == ECONNABORTED))
+ return retired_fd;
+#elif (defined ZMQ_HAVE_SOLARIS || defined ZMQ_HAVE_AIX)
+ if (sock == -1 &&
+ (errno == EWOULDBLOCK || errno == EINTR ||
+ errno == ECONNABORTED || errno == EPROTO))
+ return retired_fd;
+#elif defined ZMQ_HAVE_HPUX
+ if (sock == -1 &&
+ (errno == EAGAIN || errno == EWOULDBLOCK ||
+ errno == EINTR || errno == ECONNABORTED || errno == ENOBUFS))
+ return retired_fd;
+#elif defined ZMQ_HAVE_QNXNTO
+ if (sock == -1 &&
+ (errno == EWOULDBLOCK || errno == EINTR || errno == ECONNABORTED))
+ return retired_fd;
+#endif
+
+ errno_assert (sock != -1);
+
+ // Set to non-blocking mode.
+#ifdef ZMQ_HAVE_OPENVMS
+ int flags = 1;
+ int rc = ioctl (sock, FIONBIO, &flags);
+ errno_assert (rc != -1);
+#else
+ int flags = fcntl (s, F_GETFL, 0);
+ if (flags == -1)
+ flags = 0;
+ int rc = fcntl (sock, F_SETFL, flags | O_NONBLOCK);
+ errno_assert (rc != -1);
+#endif
+
+ return sock;
+}
+
+#endif
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