1/*
2 Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
3
4 This file is part of libzmq, the ZeroMQ core engine in C++.
5
6 libzmq is free software; you can redistribute it and/or modify it under
7 the terms of the GNU Lesser General Public License (LGPL) as published
8 by the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 As a special exception, the Contributors give you permission to link
12 this library with independent modules to produce an executable,
13 regardless of the license terms of these independent modules, and to
14 copy and distribute the resulting executable under terms of your choice,
15 provided that you also meet, for each linked independent module, the
16 terms and conditions of the license of that module. An independent
17 module is a module which is not derived from or based on this library.
18 If you modify this library, you must extend this exception to your
19 version of the library.
20
21 libzmq is distributed in the hope that it will be useful, but WITHOUT
22 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
23 FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
24 License for more details.
25
26 You should have received a copy of the GNU Lesser General Public License
27 along with this program. If not, see <http://www.gnu.org/licenses/>.
28*/
29
30#include "precompiled.hpp"
31#include "ipc_connecter.hpp"
32
33#if defined ZMQ_HAVE_IPC
34
35#include <new>
36#include <string>
37
38#include "io_thread.hpp"
39#include "random.hpp"
40#include "err.hpp"
41#include "ip.hpp"
42#include "address.hpp"
43#include "ipc_address.hpp"
44#include "session_base.hpp"
45
46#ifdef _MSC_VER
47#include <afunix.h>
48#else
49#include <unistd.h>
50#include <sys/types.h>
51#include <sys/socket.h>
52#include <sys/un.h>
53#endif
54
55zmq::ipc_connecter_t::ipc_connecter_t (class io_thread_t *io_thread_,
56 class session_base_t *session_,
57 const options_t &options_,
58 address_t *addr_,
59 bool delayed_start_) :
60 stream_connecter_base_t (
61 io_thread_, session_, options_, addr_, delayed_start_)
62{
63 zmq_assert (_addr->protocol == protocol_name::ipc);
64}
65
66void zmq::ipc_connecter_t::out_event ()
67{
68 fd_t fd = connect ();
69 rm_handle ();
70
71 // Handle the error condition by attempt to reconnect.
72 if (fd == retired_fd) {
73 close ();
74 add_reconnect_timer ();
75 return;
76 }
77
78 create_engine (fd, get_socket_name<ipc_address_t> (fd, socket_end_local));
79}
80
81void zmq::ipc_connecter_t::start_connecting ()
82{
83 // Open the connecting socket.
84 int rc = open ();
85
86 // Connect may succeed in synchronous manner.
87 if (rc == 0) {
88 _handle = add_fd (_s);
89 out_event ();
90 }
91
92 // Connection establishment may be delayed. Poll for its completion.
93 else if (rc == -1 && errno == EINPROGRESS) {
94 _handle = add_fd (_s);
95 set_pollout (_handle);
96 _socket->event_connect_delayed (
97 make_unconnected_connect_endpoint_pair (_endpoint), zmq_errno ());
98
99 // TODO, tcp_connecter_t adds a connect timer in this case; maybe this
100 // should be done here as well (and then this could be pulled up to
101 // stream_connecter_base_t).
102 }
103
104 // Handle any other error condition by eventual reconnect.
105 else {
106 if (_s != retired_fd)
107 close ();
108 add_reconnect_timer ();
109 }
110}
111
112int zmq::ipc_connecter_t::open ()
113{
114 zmq_assert (_s == retired_fd);
115
116 // Create the socket.
117 _s = open_socket (AF_UNIX, SOCK_STREAM, 0);
118 if (_s == -1)
119 return -1;
120
121 // Set the non-blocking flag.
122 unblock_socket (_s);
123
124 // Connect to the remote peer.
125 int rc = ::connect (_s, _addr->resolved.ipc_addr->addr (),
126 _addr->resolved.ipc_addr->addrlen ());
127
128 // Connect was successful immediately.
129 if (rc == 0)
130 return 0;
131
132 // Translate other error codes indicating asynchronous connect has been
133 // launched to a uniform EINPROGRESS.
134#ifdef ZMQ_HAVE_WINDOWS
135 const int last_error = WSAGetLastError ();
136 if (last_error == WSAEINPROGRESS || last_error == WSAEWOULDBLOCK)
137 errno = EINPROGRESS;
138 else
139 errno = wsa_error_to_errno (last_error);
140#else
141 if (rc == -1 && errno == EINTR) {
142 errno = EINPROGRESS;
143 }
144#endif
145
146 // Forward the error.
147 return -1;
148}
149
150zmq::fd_t zmq::ipc_connecter_t::connect ()
151{
152 // Following code should handle both Berkeley-derived socket
153 // implementations and Solaris.
154 int err = 0;
155 zmq_socklen_t len = static_cast<zmq_socklen_t> (sizeof (err));
156 int rc = getsockopt (_s, SOL_SOCKET, SO_ERROR,
157 reinterpret_cast<char *> (&err), &len);
158 if (rc == -1) {
159 if (errno == ENOPROTOOPT)
160 errno = 0;
161 err = errno;
162 }
163 if (err != 0) {
164 // Assert if the error was caused by 0MQ bug.
165 // Networking problems are OK. No need to assert.
166 errno = err;
167 errno_assert (errno == ECONNREFUSED || errno == ECONNRESET
168 || errno == ETIMEDOUT || errno == EHOSTUNREACH
169 || errno == ENETUNREACH || errno == ENETDOWN);
170
171 return retired_fd;
172 }
173
174 fd_t result = _s;
175 _s = retired_fd;
176 return result;
177}
178
179#endif
180