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8620c3e032
Of course people still "can" distributed the sources under the LGPLv3. However we provide COPYING.LESSER with additional grants. Solution: specify these grants in the header of each source file.
316 lines
8.8 KiB
C++
316 lines
8.8 KiB
C++
/*
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Copyright (c) 2007-2015 Contributors as noted in the AUTHORS file
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This file is part of libzmq, the ZeroMQ core engine in C++.
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libzmq is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License (LGPL) as published
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by the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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As a special exception, the Contributors give you permission to link
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this library with independent modules to produce an executable,
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regardless of the license terms of these independent modules, and to
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copy and distribute the resulting executable under terms of your choice,
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provided that you also meet, for each linked independent module, the
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terms and conditions of the license of that module. An independent
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module is a module which is not derived from or based on this library.
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If you modify this library, you must extend this exception to your
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version of the library.
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libzmq is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "ipc_listener.hpp"
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#if !defined ZMQ_HAVE_WINDOWS && !defined ZMQ_HAVE_OPENVMS
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#include <new>
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#include <string.h>
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#include "stream_engine.hpp"
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#include "ipc_address.hpp"
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#include "io_thread.hpp"
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#include "session_base.hpp"
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#include "config.hpp"
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#include "err.hpp"
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#include "ip.hpp"
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#include "socket_base.hpp"
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#include <unistd.h>
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#include <sys/socket.h>
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#include <fcntl.h>
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#include <sys/un.h>
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#if defined ZMQ_HAVE_SO_PEERCRED || defined ZMQ_HAVE_LOCAL_PEERCRED
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# include <sys/types.h>
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#endif
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#ifdef ZMQ_HAVE_SO_PEERCRED
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# include <pwd.h>
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# include <grp.h>
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# if defined ZMQ_HAVE_OPENBSD
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# define ucred sockpeercred
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# endif
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#endif
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zmq::ipc_listener_t::ipc_listener_t (io_thread_t *io_thread_,
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socket_base_t *socket_, const options_t &options_) :
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own_t (io_thread_, options_),
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io_object_t (io_thread_),
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has_file (false),
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s (retired_fd),
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socket (socket_)
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{
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}
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zmq::ipc_listener_t::~ipc_listener_t ()
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{
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zmq_assert (s == retired_fd);
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}
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void zmq::ipc_listener_t::process_plug ()
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{
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// Start polling for incoming connections.
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handle = add_fd (s);
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set_pollin (handle);
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}
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void zmq::ipc_listener_t::process_term (int linger_)
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{
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rm_fd (handle);
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close ();
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own_t::process_term (linger_);
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}
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void zmq::ipc_listener_t::in_event ()
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{
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fd_t fd = accept ();
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// If connection was reset by the peer in the meantime, just ignore it.
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// TODO: Handle specific errors like ENFILE/EMFILE etc.
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if (fd == retired_fd) {
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socket->event_accept_failed (endpoint, zmq_errno());
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return;
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}
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// Create the engine object for this connection.
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stream_engine_t *engine = new (std::nothrow)
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stream_engine_t (fd, options, endpoint);
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alloc_assert (engine);
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// Choose I/O thread to run connecter in. Given that we are already
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// running in an I/O thread, there must be at least one available.
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io_thread_t *io_thread = choose_io_thread (options.affinity);
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zmq_assert (io_thread);
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// Create and launch a session object.
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session_base_t *session = session_base_t::create (io_thread, false, socket,
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options, NULL);
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errno_assert (session);
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session->inc_seqnum ();
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launch_child (session);
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send_attach (session, engine, false);
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socket->event_accepted (endpoint, fd);
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}
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int zmq::ipc_listener_t::get_address (std::string &addr_)
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{
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struct sockaddr_storage ss;
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#ifdef ZMQ_HAVE_HPUX
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int sl = sizeof (ss);
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#else
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socklen_t sl = sizeof (ss);
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#endif
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int rc = getsockname (s, (sockaddr *) &ss, &sl);
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if (rc != 0) {
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addr_.clear ();
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return rc;
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}
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ipc_address_t addr ((struct sockaddr *) &ss, sl);
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return addr.to_string (addr_);
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}
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int zmq::ipc_listener_t::set_address (const char *addr_)
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{
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// Create addr on stack for auto-cleanup
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std::string addr (addr_);
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// Allow wildcard file
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if (addr [0] == '*') {
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char buffer [12] = "2134XXXXXX";
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int fd = mkstemp (buffer);
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if (fd == -1)
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return -1;
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addr.assign (buffer);
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::close (fd);
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}
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// Get rid of the file associated with the UNIX domain socket that
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// may have been left behind by the previous run of the application.
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::unlink (addr.c_str());
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filename.clear ();
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// Initialise the address structure.
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ipc_address_t address;
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int rc = address.resolve (addr.c_str());
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if (rc != 0)
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return -1;
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// Create a listening socket.
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s = open_socket (AF_UNIX, SOCK_STREAM, 0);
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if (s == -1)
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return -1;
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address.to_string (endpoint);
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// Bind the socket to the file path.
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rc = bind (s, address.addr (), address.addrlen ());
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if (rc != 0)
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goto error;
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filename.assign (addr.c_str());
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has_file = true;
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// Listen for incoming connections.
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rc = listen (s, options.backlog);
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if (rc != 0)
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goto error;
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socket->event_listening (endpoint, s);
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return 0;
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error:
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int err = errno;
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close ();
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errno = err;
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return -1;
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}
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int zmq::ipc_listener_t::close ()
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{
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zmq_assert (s != retired_fd);
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int rc = ::close (s);
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errno_assert (rc == 0);
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s = retired_fd;
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// If there's an underlying UNIX domain socket, get rid of the file it
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// is associated with.
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if (has_file && !filename.empty ()) {
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rc = ::unlink(filename.c_str ());
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if (rc != 0) {
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socket->event_close_failed (endpoint, zmq_errno());
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return -1;
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}
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}
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socket->event_closed (endpoint, s);
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return 0;
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}
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#if defined ZMQ_HAVE_SO_PEERCRED
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bool zmq::ipc_listener_t::filter (fd_t sock)
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{
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if (options.ipc_uid_accept_filters.empty () &&
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options.ipc_pid_accept_filters.empty () &&
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options.ipc_gid_accept_filters.empty ())
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return true;
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struct ucred cred;
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socklen_t size = sizeof (cred);
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if (getsockopt (sock, SOL_SOCKET, SO_PEERCRED, &cred, &size))
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return false;
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if (options.ipc_uid_accept_filters.find (cred.uid) != options.ipc_uid_accept_filters.end () ||
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options.ipc_gid_accept_filters.find (cred.gid) != options.ipc_gid_accept_filters.end () ||
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options.ipc_pid_accept_filters.find (cred.pid) != options.ipc_pid_accept_filters.end ())
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return true;
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struct passwd *pw;
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struct group *gr;
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if (!(pw = getpwuid (cred.uid)))
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return false;
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for (options_t::ipc_gid_accept_filters_t::const_iterator it = options.ipc_gid_accept_filters.begin ();
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it != options.ipc_gid_accept_filters.end (); it++) {
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if (!(gr = getgrgid (*it)))
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continue;
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for (char **mem = gr->gr_mem; *mem; mem++) {
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if (!strcmp (*mem, pw->pw_name))
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return true;
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}
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}
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return false;
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}
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#elif defined ZMQ_HAVE_LOCAL_PEERCRED
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bool zmq::ipc_listener_t::filter (fd_t sock)
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{
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if (options.ipc_uid_accept_filters.empty () &&
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options.ipc_gid_accept_filters.empty ())
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return true;
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struct xucred cred;
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socklen_t size = sizeof (cred);
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if (getsockopt (sock, 0, LOCAL_PEERCRED, &cred, &size))
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return false;
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if (cred.cr_version != XUCRED_VERSION)
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return false;
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if (options.ipc_uid_accept_filters.find (cred.cr_uid) != options.ipc_uid_accept_filters.end ())
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return true;
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for (int i = 0; i < cred.cr_ngroups; i++) {
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if (options.ipc_gid_accept_filters.find (cred.cr_groups[i]) != options.ipc_gid_accept_filters.end ())
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return true;
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}
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return false;
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}
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#endif
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zmq::fd_t zmq::ipc_listener_t::accept ()
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{
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// Accept one connection and deal with different failure modes.
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// The situation where connection cannot be accepted due to insufficient
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// resources is considered valid and treated by ignoring the connection.
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zmq_assert (s != retired_fd);
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fd_t sock = ::accept (s, NULL, NULL);
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if (sock == -1) {
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errno_assert (errno == EAGAIN || errno == EWOULDBLOCK ||
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errno == EINTR || errno == ECONNABORTED || errno == EPROTO ||
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errno == ENFILE);
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return retired_fd;
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}
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// Race condition can cause socket not to be closed (if fork happens
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// between accept and this point).
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#ifdef FD_CLOEXEC
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int rc = fcntl (sock, F_SETFD, FD_CLOEXEC);
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errno_assert (rc != -1);
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#endif
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// IPC accept() filters
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#if defined ZMQ_HAVE_SO_PEERCRED || defined ZMQ_HAVE_LOCAL_PEERCRED
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if (!filter (sock)) {
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int rc = ::close (sock);
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errno_assert (rc == 0);
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return retired_fd;
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}
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#endif
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return sock;
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}
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#endif
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