/* 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 "platform.hpp" #if defined ZMQ_HAVE_WINDOWS #include "windows.hpp" #else #include <sys/types.h> #include <unistd.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #endif #include "udp_engine.hpp" #include "session_base.hpp" #include "v2_protocol.hpp" #include "err.hpp" #include "ip.hpp" zmq::udp_engine_t::udp_engine_t() : plugged (false), fd(-1), session(NULL), handle(NULL), address(NULL), send_enabled(false), recv_enabled(false) { } zmq::udp_engine_t::~udp_engine_t() { zmq_assert (!plugged); if (fd != retired_fd) { #ifdef ZMQ_HAVE_WINDOWS int rc = closesocket (fd); wsa_assert (rc != SOCKET_ERROR); #else int rc = close (fd); errno_assert (rc == 0); #endif fd = retired_fd; } } int zmq::udp_engine_t::init (address_t *address_, bool send_, bool recv_) { zmq_assert (address_); zmq_assert (send_ || recv_); send_enabled = send_; recv_enabled = recv_; address = address_; fd = open_socket (address->resolved.udp_addr->family (), SOCK_DGRAM, IPPROTO_UDP); if (fd == retired_fd) return -1; unblock_socket (fd); return 0; } void zmq::udp_engine_t::plug (io_thread_t* io_thread_, session_base_t *session_) { zmq_assert (!plugged); plugged = true; zmq_assert (!session); zmq_assert (session_); session = session_; // Connect to I/O threads poller object. io_object_t::plug (io_thread_); handle = add_fd (fd); if (send_enabled) set_pollout (handle); if (recv_enabled) { int on = 1; int rc = setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, (char *) &on, sizeof (on)); #ifdef ZMQ_HAVE_WINDOWS wsa_assert (rc != SOCKET_ERROR); #else errno_assert (rc == 0); #endif rc = bind (fd, address->resolved.udp_addr->bind_addr (), address->resolved.udp_addr->bind_addrlen ()); #ifdef ZMQ_HAVE_WINDOWS wsa_assert (rc != SOCKET_ERROR); #else errno_assert (rc == 0); #endif if (address->resolved.udp_addr->is_mcast ()) { struct ip_mreq mreq; mreq.imr_multiaddr = address->resolved.udp_addr->multicast_ip (); mreq.imr_interface = address->resolved.udp_addr->interface_ip (); rc = setsockopt (fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char*) &mreq, sizeof (mreq)); #ifdef ZMQ_HAVE_WINDOWS wsa_assert (rc != SOCKET_ERROR); #else errno_assert (rc == 0); #endif } set_pollin (handle); // Call restart output to drop all join/leave commands restart_output (); } } void zmq::udp_engine_t::terminate() { zmq_assert (plugged); plugged = false; rm_fd (handle); // Disconnect from I/O threads poller object. io_object_t::unplug (); delete this; } void zmq::udp_engine_t::out_event() { msg_t group_msg; int rc = session->pull_msg (&group_msg); errno_assert (rc == 0 || (rc == -1 && errno == EAGAIN)); if (rc == 0) { msg_t body_msg; rc = session->pull_msg (&body_msg); size_t group_size = group_msg.size (); size_t body_size = body_msg.size (); size_t size = group_size + body_size + 1; // TODO: check if larger than maximum size out_buffer[0] = (unsigned char) group_size; memcpy (out_buffer + 1, group_msg.data (), group_size); memcpy (out_buffer + 1 + group_size, body_msg.data (), body_size); rc = group_msg.close (); errno_assert (rc == 0); body_msg.close (); errno_assert (rc == 0); #ifdef ZMQ_HAVE_WINDOWS rc = sendto (fd, (const char *) out_buffer, (int) size, 0, address->resolved.udp_addr->dest_addr (), (int) address->resolved.udp_addr->dest_addrlen ()); wsa_assert (rc != SOCKET_ERROR); #else rc = sendto (fd, out_buffer, size, 0, address->resolved.udp_addr->dest_addr (), address->resolved.udp_addr->dest_addrlen ()); errno_assert (rc != -1); #endif } else reset_pollout (handle); } void zmq::udp_engine_t::restart_output() { // If we don't support send we just drop all messages if (!send_enabled) { msg_t msg; while (session->pull_msg (&msg) == 0) msg.close (); } else { set_pollout(handle); out_event (); } } void zmq::udp_engine_t::in_event() { #ifdef ZMQ_HAVE_WINDOWS int nbytes = recv(fd, (char*) in_buffer, MAX_UDP_MSG, 0); const int last_error = WSAGetLastError(); if (nbytes == SOCKET_ERROR) { wsa_assert( last_error == WSAENETDOWN || last_error == WSAENETRESET || last_error == WSAEWOULDBLOCK); return; } #else int nbytes = recv(fd, in_buffer, MAX_UDP_MSG, 0); if (nbytes == -1) { errno_assert(errno != EBADF && errno != EFAULT && errno != ENOMEM && errno != ENOTSOCK); return; } #endif int group_size = in_buffer[0]; // This doesn't fit, just ingore if (nbytes - 1 < group_size) return; int body_size = nbytes - 1 - group_size; msg_t msg; int rc = msg.init_size (group_size); errno_assert (rc == 0); msg.set_flags (msg_t::more); memcpy (msg.data (), in_buffer + 1, group_size); rc = session->push_msg (&msg); errno_assert (rc == 0 || (rc == -1 && errno == EAGAIN)); // Pipe is full if (rc != 0) { rc = msg.close (); errno_assert (rc == 0); reset_pollin (handle); return; } rc = msg.close (); errno_assert (rc == 0); rc = msg.init_size (body_size); errno_assert (rc == 0); memcpy (msg.data (), in_buffer + 1 + group_size, body_size); rc = session->push_msg (&msg); errno_assert (rc == 0); rc = msg.close (); errno_assert (rc == 0); session->flush (); } void zmq::udp_engine_t::restart_input() { if (!recv_enabled) return; set_pollin (handle); in_event (); }