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-rw-r--r--src/ipc_connecter.cpp381
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diff --git a/src/ipc_connecter.cpp b/src/ipc_connecter.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>
+
+#include "ipc_connecter.hpp"
+#include "tcp_engine.hpp"
+#include "io_thread.hpp"
+#include "platform.hpp"
+#include "random.hpp"
+#include "ip.hpp"
+#include "err.hpp"
+
+#if defined ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#else
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <netinet/tcp.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <fcntl.h>
+#ifdef ZMQ_HAVE_OPENVMS
+#include <ioctl.h>
+#endif
+#endif
+
+zmq::ipc_connecter_t::ipc_connecter_t (class io_thread_t *io_thread_,
+ class session_t *session_, const options_t &options_,
+ const char *address_, bool wait_) :
+ own_t (io_thread_, options_),
+ io_object_t (io_thread_),
+ s (retired_fd),
+ handle_valid (false),
+ wait (wait_),
+ session (session_),
+ current_reconnect_ivl(options.reconnect_ivl)
+{
+ memset (&addr, 0, sizeof (addr));
+ addr_len = 0;
+
+ // TODO: set_addess should be called separately, so that the error
+ // can be propagated.
+ int rc = set_address (address_);
+ zmq_assert (rc == 0);
+}
+
+zmq::ipc_connecter_t::~ipc_connecter_t ()
+{
+ if (wait)
+ cancel_timer (reconnect_timer_id);
+ if (handle_valid)
+ rm_fd (handle);
+
+ if (s != retired_fd)
+ close ();
+}
+
+void zmq::ipc_connecter_t::process_plug ()
+{
+ if (wait)
+ add_reconnect_timer();
+ else
+ start_connecting ();
+}
+
+void zmq::ipc_connecter_t::in_event ()
+{
+ // We are not polling for incomming data, so we are actually called
+ // because of error here. However, we can get error on out event as well
+ // on some platforms, so we'll simply handle both events in the same way.
+ out_event ();
+}
+
+void zmq::ipc_connecter_t::out_event ()
+{
+ fd_t fd = connect ();
+ rm_fd (handle);
+ handle_valid = false;
+
+ // Handle the error condition by attempt to reconnect.
+ if (fd == retired_fd) {
+ close ();
+ wait = true;
+ add_reconnect_timer();
+ return;
+ }
+
+ // Create the engine object for this connection.
+ tcp_engine_t *engine = new (std::nothrow) tcp_engine_t (fd, options);
+ alloc_assert (engine);
+
+ // Attach the engine to the corresponding session object.
+ send_attach (session, engine);
+
+ // Shut the connecter down.
+ terminate ();
+}
+
+void zmq::ipc_connecter_t::timer_event (int id_)
+{
+ zmq_assert (id_ == reconnect_timer_id);
+ wait = false;
+ start_connecting ();
+}
+
+void zmq::ipc_connecter_t::start_connecting ()
+{
+ // Open the connecting socket.
+ int rc = open ();
+
+ // Connect may succeed in synchronous manner.
+ if (rc == 0) {
+ handle = add_fd (s);
+ handle_valid = true;
+ out_event ();
+ return;
+ }
+
+ // Connection establishment may be dealyed. Poll for its completion.
+ else if (rc == -1 && errno == EAGAIN) {
+ handle = add_fd (s);
+ handle_valid = true;
+ set_pollout (handle);
+ return;
+ }
+
+ // Handle any other error condition by eventual reconnect.
+ wait = true;
+ add_reconnect_timer();
+}
+
+void zmq::ipc_connecter_t::add_reconnect_timer()
+{
+ add_timer (get_new_reconnect_ivl(), reconnect_timer_id);
+}
+
+int zmq::ipc_connecter_t::get_new_reconnect_ivl ()
+{
+ // The new interval is the current interval + random value.
+ int this_interval = current_reconnect_ivl +
+ (generate_random () % options.reconnect_ivl);
+
+ // Only change the current reconnect interval if the maximum reconnect
+ // interval was set and if it's larger than the reconnect interval.
+ if (options.reconnect_ivl_max > 0 &&
+ options.reconnect_ivl_max > options.reconnect_ivl) {
+
+ // Calculate the next interval
+ current_reconnect_ivl = current_reconnect_ivl * 2;
+ if(current_reconnect_ivl >= options.reconnect_ivl_max) {
+ current_reconnect_ivl = options.reconnect_ivl_max;
+ }
+ }
+ return this_interval;
+}
+
+#ifdef ZMQ_HAVE_WINDOWS
+
+int zmq::ipc_connecter_t::set_address (const char *protocol_, const char *addr_)
+{
+ errno = EPROTONOSUPPORT;
+ return -1;
+}
+
+int zmq::ipc_connecter_t::open ()
+{
+ zmq_assert (s == retired_fd);
+
+ // Create the socket.
+ s = socket (addr.ss_family, SOCK_STREAM, IPPROTO_TCP);
+ if (s == INVALID_SOCKET) {
+ wsa_error_to_errno ();
+ return -1;
+ }
+
+ // Set to non-blocking mode.
+ unsigned long argp = 1;
+ int rc = ioctlsocket (s, FIONBIO, &argp);
+ wsa_assert (rc != SOCKET_ERROR);
+
+ // Connect to the remote peer.
+ rc = ::connect (s, (sockaddr*) &addr, addr_len);
+
+ // Connect was successfull immediately.
+ if (rc == 0)
+ return 0;
+
+ // Asynchronous connect was launched.
+ if (rc == SOCKET_ERROR && (WSAGetLastError () == WSAEINPROGRESS ||
+ WSAGetLastError () == WSAEWOULDBLOCK)) {
+ errno = EAGAIN;
+ return -1;
+ }
+
+ wsa_error_to_errno ();
+ return -1;
+}
+
+int zmq::ipc_connecter_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_connecter_t::connect ()
+{
+ // Nonblocking connect have finished. Check whether an error occured.
+ int err = 0;
+ socklen_t len = sizeof err;
+ int rc = getsockopt (s, SOL_SOCKET, SO_ERROR, (char*) &err, &len);
+ zmq_assert (rc == 0);
+ if (err != 0) {
+
+ // Assert that the error was caused by the networking problems
+ // rather than 0MQ bug.
+ if (err == WSAECONNREFUSED || err == WSAETIMEDOUT ||
+ err == WSAECONNABORTED || err == WSAEHOSTUNREACH ||
+ err == WSAENETUNREACH || err == WSAENETDOWN)
+ return retired_fd;
+
+ wsa_assert_no (err);
+ }
+
+ // Return the newly connected socket.
+ fd_t result = s;
+ s = retired_fd;
+ return result;
+}
+
+#else
+
+int zmq::ipc_connecter_t::set_address (const char *addr_)
+{
+ return resolve_local_path (&addr, &addr_len, addr_);
+}
+
+int zmq::ipc_connecter_t::open ()
+{
+ zmq_assert (s == retired_fd);
+ struct sockaddr *sa = (struct sockaddr*) &addr;
+
+ if (AF_UNIX != sa->sa_family) {
+
+ // Create the socket.
+ s = socket (sa->sa_family, SOCK_STREAM, IPPROTO_TCP);
+ if (s == -1)
+ return -1;
+
+ // Set to non-blocking mode.
+#ifdef ZMQ_HAVE_OPENVMS
+ int flags = 1;
+ int rc = ioctl (s, FIONBIO, &flags);
+ 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
+
+ // Connect to the remote peer.
+ rc = ::connect (s, (struct sockaddr*) &addr, addr_len);
+
+ // Connect was successfull immediately.
+ if (rc == 0)
+ return 0;
+
+ // Asynchronous connect was launched.
+ if (rc == -1 && errno == EINPROGRESS) {
+ errno = EAGAIN;
+ return -1;
+ }
+
+ // Error occured.
+ int err = errno;
+ close ();
+ errno = err;
+ return -1;
+ }
+
+#ifndef ZMQ_HAVE_OPENVMS
+ else {
+
+ // Create the socket.
+ zmq_assert (AF_UNIX == sa->sa_family);
+ 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;
+ int rc = fcntl (s, F_SETFL, flag | O_NONBLOCK);
+ errno_assert (rc != -1);
+
+ // Connect to the remote peer.
+ rc = ::connect (s, (struct sockaddr*) &addr, sizeof (sockaddr_un));
+
+ // Connect was successfull immediately.
+ if (rc == 0)
+ return 0;
+
+ // Error occured.
+ int err = errno;
+ close ();
+ errno = err;
+ return -1;
+ }
+#endif
+
+ zmq_assert (false);
+ return -1;
+}
+
+int zmq::ipc_connecter_t::close ()
+{
+ zmq_assert (s != retired_fd);
+ int rc = ::close (s);
+ if (rc != 0)
+ return -1;
+ s = retired_fd;
+ return 0;
+}
+
+zmq::fd_t zmq::ipc_connecter_t::connect ()
+{
+ // Following code should handle both Berkeley-derived socket
+ // implementations and Solaris.
+ int err = 0;
+#if defined ZMQ_HAVE_HPUX
+ int len = sizeof (err);
+#else
+ socklen_t len = sizeof (err);
+#endif
+ int rc = getsockopt (s, SOL_SOCKET, SO_ERROR, (char*) &err, &len);
+ if (rc == -1)
+ err = errno;
+ if (err != 0) {
+
+ // Assert if the error was caused by 0MQ bug.
+ // Networking problems are OK. No need to assert.
+ errno = err;
+ errno_assert (errno == ECONNREFUSED || errno == ECONNRESET ||
+ errno == ETIMEDOUT || errno == EHOSTUNREACH ||
+ errno == ENETUNREACH || errno == ENETDOWN);
+
+ return retired_fd;
+ }
+
+ fd_t result = s;
+ s = retired_fd;
+ return result;
+}
+
+#endif
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