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Diffstat (limited to 'src/tcp_listener.cpp')
| -rw-r--r-- | src/tcp_listener.cpp | 304 |
1 files changed, 304 insertions, 0 deletions
diff --git a/src/tcp_listener.cpp b/src/tcp_listener.cpp new file mode 100644 index 0000000..89e146b --- /dev/null +++ b/src/tcp_listener.cpp @@ -0,0 +1,304 @@ +/* + Copyright (c) 2007-2013 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 "platform.hpp" +#include "tcp_listener.hpp" +#include "stream_engine.hpp" +#include "io_thread.hpp" +#include "session_base.hpp" +#include "config.hpp" +#include "err.hpp" +#include "ip.hpp" +#include "tcp.hpp" +#include "socket_base.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_), + s (retired_fd), + socket (socket_) +{ +} + +zmq::tcp_listener_t::~tcp_listener_t () +{ + zmq_assert (s == retired_fd); +} + +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); + close (); + 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) { + socket->event_accept_failed (endpoint, zmq_errno()); + return; + } + + tune_tcp_socket (fd); + tune_tcp_keepalives (fd, options.tcp_keepalive, options.tcp_keepalive_cnt, options.tcp_keepalive_idle, options.tcp_keepalive_intvl); + + // Create the engine object for this connection. + stream_engine_t *engine = new (std::nothrow) + stream_engine_t (fd, options, 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 (endpoint, fd); +} + +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 + socket->event_closed (endpoint, s); + s = retired_fd; +} + +int zmq::tcp_listener_t::get_address (std::string &addr_) +{ + // Get the details of the TCP socket + struct sockaddr_storage ss; +#ifdef ZMQ_HAVE_HPUX + int sl = sizeof (ss); +#else + socklen_t sl = sizeof (ss); +#endif + int rc = getsockname (s, (struct sockaddr *) &ss, &sl); + + if (rc != 0) { + addr_.clear (); + return rc; + } + + tcp_address_t addr ((struct sockaddr *) &ss, sl); + return addr.to_string (addr_); +} + +int zmq::tcp_listener_t::set_address (const char *addr_) +{ + // Convert the textual address into address structure. + int rc = address.resolve (addr_, true, options.ipv6); + 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) + errno = wsa_error_to_errno (WSAGetLastError ()); +#endif + + // IPv6 address family not supported, try automatic downgrade to IPv4. + if (address.family () == AF_INET6 + && errno == EAFNOSUPPORT + && options.ipv6) { + 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) { + 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 + + // 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); + + // Set the socket buffer limits for the underlying socket. + if (options.sndbuf != 0) + set_tcp_send_buffer (s, options.sndbuf); + if (options.rcvbuf != 0) + set_tcp_receive_buffer (s, options.rcvbuf); + + // 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 + + address.to_string (endpoint); + + // Bind the socket to the network interface and port. + 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 incomming 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 (endpoint, s); + return 0; + +error: + int err = errno; + close (); + errno = err; + return -1; +} + +zmq::fd_t zmq::tcp_listener_t::accept () +{ + // The situation where connection cannot be accepted due to insufficient + // resources is considered valid and treated by ignoring the connection. + // Accept one connection and deal with different failure modes. + zmq_assert (s != retired_fd); + + struct sockaddr_storage ss; + memset (&ss, 0, sizeof (ss)); +#ifdef ZMQ_HAVE_HPUX + int ss_len = sizeof (ss); +#else + socklen_t ss_len = sizeof (ss); +#endif + fd_t sock = ::accept (s, (struct sockaddr *) &ss, &ss_len); + +#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 + + if (!options.tcp_accept_filters.empty ()) { + bool matched = false; + for (options_t::tcp_accept_filters_t::size_type i = 0; i != options.tcp_accept_filters.size (); ++i) { + if (options.tcp_accept_filters[i].match_address ((struct sockaddr *) &ss, ss_len)) { + matched = true; + break; + } + } + if (!matched) { +#ifdef ZMQ_HAVE_WINDOWS + int rc = closesocket (sock); + wsa_assert (rc != SOCKET_ERROR); +#else + int rc = ::close (sock); + errno_assert (rc == 0); +#endif + return retired_fd; + } + } + + return sock; +} |