diff options
Diffstat (limited to 'external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/ipc_listener.cpp')
-rw-r--r-- | external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/ipc_listener.cpp | 315 |
1 files changed, 315 insertions, 0 deletions
diff --git a/external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/ipc_listener.cpp b/external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/ipc_listener.cpp new file mode 100644 index 00000000..5c2a028f --- /dev/null +++ b/external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/ipc_listener.cpp @@ -0,0 +1,315 @@ +/* + Copyright (c) 2007-2015 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 "ipc_listener.hpp" + +#if !defined ZMQ_HAVE_WINDOWS && !defined ZMQ_HAVE_OPENVMS + +#include <new> + +#include <string.h> + +#include "stream_engine.hpp" +#include "ipc_address.hpp" +#include "io_thread.hpp" +#include "session_base.hpp" +#include "config.hpp" +#include "err.hpp" +#include "ip.hpp" +#include "socket_base.hpp" + +#include <unistd.h> +#include <sys/socket.h> +#include <fcntl.h> +#include <sys/un.h> + +#if defined ZMQ_HAVE_SO_PEERCRED || defined ZMQ_HAVE_LOCAL_PEERCRED +# include <sys/types.h> +#endif +#ifdef ZMQ_HAVE_SO_PEERCRED +# include <pwd.h> +# include <grp.h> +# if defined ZMQ_HAVE_OPENBSD +# define ucred sockpeercred +# 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_) +{ +} + +zmq::ipc_listener_t::~ipc_listener_t () +{ + zmq_assert (s == retired_fd); +} + +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); + close (); + 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) { + socket->event_accept_failed (endpoint, zmq_errno()); + return; + } + + // 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); +} + +int zmq::ipc_listener_t::get_address (std::string &addr_) +{ + struct sockaddr_storage ss; +#ifdef ZMQ_HAVE_HPUX + int sl = sizeof (ss); +#else + socklen_t sl = sizeof (ss); +#endif + int rc = getsockname (s, (sockaddr *) &ss, &sl); + if (rc != 0) { + addr_.clear (); + return rc; + } + + ipc_address_t addr ((struct sockaddr *) &ss, sl); + return addr.to_string (addr_); +} + +int zmq::ipc_listener_t::set_address (const char *addr_) +{ + // Create addr on stack for auto-cleanup + std::string addr (addr_); + + // Allow wildcard file + if (addr [0] == '*') { + char buffer [12] = "2134XXXXXX"; + int fd = mkstemp (buffer); + if (fd == -1) + return -1; + addr.assign (buffer); + ::close (fd); + } + + // 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.c_str()); + filename.clear (); + + // Initialise the address structure. + ipc_address_t address; + int rc = address.resolve (addr.c_str()); + if (rc != 0) + return -1; + + // Create a listening socket. + s = open_socket (AF_UNIX, SOCK_STREAM, 0); + if (s == -1) + return -1; + + address.to_string (endpoint); + + // Bind the socket to the file path. + rc = bind (s, address.addr (), address.addrlen ()); + if (rc != 0) + goto error; + + filename.assign (addr.c_str()); + has_file = true; + + // Listen for incoming connections. + rc = listen (s, options.backlog); + if (rc != 0) + goto error; + + socket->event_listening (endpoint, s); + return 0; + +error: + int err = errno; + close (); + errno = err; + return -1; +} + +int zmq::ipc_listener_t::close () +{ + zmq_assert (s != retired_fd); + int rc = ::close (s); + errno_assert (rc == 0); + + s = retired_fd; + + // If there's an underlying UNIX domain socket, get rid of the file it + // is associated with. + if (has_file && !filename.empty ()) { + rc = ::unlink(filename.c_str ()); + if (rc != 0) { + socket->event_close_failed (endpoint, zmq_errno()); + return -1; + } + } + + socket->event_closed (endpoint, s); + return 0; +} + +#if defined ZMQ_HAVE_SO_PEERCRED + +bool zmq::ipc_listener_t::filter (fd_t sock) +{ + if (options.ipc_uid_accept_filters.empty () && + options.ipc_pid_accept_filters.empty () && + options.ipc_gid_accept_filters.empty ()) + return true; + + struct ucred cred; + socklen_t size = sizeof (cred); + + if (getsockopt (sock, SOL_SOCKET, SO_PEERCRED, &cred, &size)) + return false; + if (options.ipc_uid_accept_filters.find (cred.uid) != options.ipc_uid_accept_filters.end () || + options.ipc_gid_accept_filters.find (cred.gid) != options.ipc_gid_accept_filters.end () || + options.ipc_pid_accept_filters.find (cred.pid) != options.ipc_pid_accept_filters.end ()) + return true; + + struct passwd *pw; + struct group *gr; + + if (!(pw = getpwuid (cred.uid))) + return false; + for (options_t::ipc_gid_accept_filters_t::const_iterator it = options.ipc_gid_accept_filters.begin (); + it != options.ipc_gid_accept_filters.end (); it++) { + if (!(gr = getgrgid (*it))) + continue; + for (char **mem = gr->gr_mem; *mem; mem++) { + if (!strcmp (*mem, pw->pw_name)) + return true; + } + } + return false; +} + +#elif defined ZMQ_HAVE_LOCAL_PEERCRED + +bool zmq::ipc_listener_t::filter (fd_t sock) +{ + if (options.ipc_uid_accept_filters.empty () && + options.ipc_gid_accept_filters.empty ()) + return true; + + struct xucred cred; + socklen_t size = sizeof (cred); + + if (getsockopt (sock, 0, LOCAL_PEERCRED, &cred, &size)) + return false; + if (cred.cr_version != XUCRED_VERSION) + return false; + if (options.ipc_uid_accept_filters.find (cred.cr_uid) != options.ipc_uid_accept_filters.end ()) + return true; + for (int i = 0; i < cred.cr_ngroups; i++) { + if (options.ipc_gid_accept_filters.find (cred.cr_groups[i]) != options.ipc_gid_accept_filters.end ()) + return true; + } + + return false; +} + +#endif + +zmq::fd_t zmq::ipc_listener_t::accept () +{ + // Accept one connection and deal with different failure modes. + // The situation where connection cannot be accepted due to insufficient + // resources is considered valid and treated by ignoring the connection. + zmq_assert (s != retired_fd); + fd_t sock = ::accept (s, NULL, NULL); + if (sock == -1) { + errno_assert (errno == EAGAIN || errno == EWOULDBLOCK || + errno == EINTR || errno == ECONNABORTED || errno == EPROTO || + errno == ENFILE); + return retired_fd; + } + + // Race condition can cause socket not to be closed (if fork happens + // between accept and this point). +#ifdef FD_CLOEXEC + int rc = fcntl (sock, F_SETFD, FD_CLOEXEC); + errno_assert (rc != -1); +#endif + + // IPC accept() filters +#if defined ZMQ_HAVE_SO_PEERCRED || defined ZMQ_HAVE_LOCAL_PEERCRED + if (!filter (sock)) { + int rc = ::close (sock); + errno_assert (rc == 0); + return retired_fd; + } +#endif + + return sock; +} + +#endif |