1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
/*
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 "tipc_connecter.hpp"
#if defined ZMQ_HAVE_TIPC
#include <new>
#include <string>
#include "stream_engine.hpp"
#include "io_thread.hpp"
#include "platform.hpp"
#include "random.hpp"
#include "err.hpp"
#include "ip.hpp"
#include "address.hpp"
#include "tipc_address.hpp"
#include "session_base.hpp"
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#ifdef ZMQ_HAVE_VXWORKS
#include <sockLib.h>
#endif
zmq::tipc_connecter_t::tipc_connecter_t (class io_thread_t *io_thread_,
class session_base_t *session_,
const options_t &options_,
const address_t *addr_,
bool delayed_start_) :
own_t (io_thread_, options_),
io_object_t (io_thread_),
addr (addr_),
s (retired_fd),
handle_valid (false),
delayed_start (delayed_start_),
timer_started (false),
session (session_),
current_reconnect_ivl (options.reconnect_ivl)
{
zmq_assert (addr);
zmq_assert (addr->protocol == "tipc");
addr->to_string (endpoint);
socket = session->get_socket ();
}
zmq::tipc_connecter_t::~tipc_connecter_t ()
{
zmq_assert (!timer_started);
zmq_assert (!handle_valid);
zmq_assert (s == retired_fd);
}
void zmq::tipc_connecter_t::process_plug ()
{
if (delayed_start)
add_reconnect_timer ();
else
start_connecting ();
}
void zmq::tipc_connecter_t::process_term (int linger_)
{
if (timer_started) {
cancel_timer (reconnect_timer_id);
timer_started = false;
}
if (handle_valid) {
rm_fd (handle);
handle_valid = false;
}
if (s != retired_fd)
close ();
own_t::process_term (linger_);
}
void zmq::tipc_connecter_t::in_event ()
{
// We are not polling for incoming data, so we are actually called
// because of error here. However, we can get error on out event as well
// on some platforms, so we'll simply handle both events in the same way.
out_event ();
}
void zmq::tipc_connecter_t::out_event ()
{
fd_t fd = connect ();
rm_fd (handle);
handle_valid = false;
// Handle the error condition by attempt to reconnect.
if (fd == retired_fd) {
close ();
add_reconnect_timer ();
return;
}
// Create the engine object for this connection.
stream_engine_t *engine =
new (std::nothrow) stream_engine_t (fd, options, endpoint);
alloc_assert (engine);
// Attach the engine to the corresponding session object.
send_attach (session, engine);
// Shut the connecter down.
terminate ();
socket->event_connected (endpoint, fd);
}
void zmq::tipc_connecter_t::timer_event (int id_)
{
zmq_assert (id_ == reconnect_timer_id);
timer_started = false;
start_connecting ();
}
void zmq::tipc_connecter_t::start_connecting ()
{
// Open the connecting socket.
int rc = open ();
// Connect may succeed in synchronous manner.
if (rc == 0) {
handle = add_fd (s);
handle_valid = true;
out_event ();
}
// Connection establishment may be delayed. Poll for its completion.
else if (rc == -1 && errno == EINPROGRESS) {
handle = add_fd (s);
handle_valid = true;
set_pollout (handle);
socket->event_connect_delayed (endpoint, zmq_errno ());
}
// Handle any other error condition by eventual reconnect.
else {
if (s != retired_fd)
close ();
add_reconnect_timer ();
}
}
void zmq::tipc_connecter_t::add_reconnect_timer ()
{
int rc_ivl = get_new_reconnect_ivl ();
add_timer (rc_ivl, reconnect_timer_id);
socket->event_connect_retried (endpoint, rc_ivl);
timer_started = true;
}
int zmq::tipc_connecter_t::get_new_reconnect_ivl ()
{
// The new interval is the current interval + random value.
int this_interval =
current_reconnect_ivl + (generate_random () % options.reconnect_ivl);
// Only change the current reconnect interval if the maximum reconnect
// interval was set and if it's larger than the reconnect interval.
if (options.reconnect_ivl_max > 0
&& options.reconnect_ivl_max > options.reconnect_ivl) {
// Calculate the next interval
current_reconnect_ivl = current_reconnect_ivl * 2;
if (current_reconnect_ivl >= options.reconnect_ivl_max) {
current_reconnect_ivl = options.reconnect_ivl_max;
}
}
return this_interval;
}
int zmq::tipc_connecter_t::open ()
{
zmq_assert (s == retired_fd);
// Cannot connect to random tipc addresses
if (addr->resolved.tipc_addr->is_random ()) {
errno = EINVAL;
return -1;
}
// Create the socket.
s = open_socket (AF_TIPC, SOCK_STREAM, 0);
if (s == -1)
return -1;
// Set the non-blocking flag.
unblock_socket (s);
// Connect to the remote peer.
#ifdef ZMQ_HAVE_VXWORKS
int rc = ::connect (s, (sockaddr *) addr->resolved.tipc_addr->addr (),
addr->resolved.tipc_addr->addrlen ());
#else
int rc = ::connect (s, addr->resolved.tipc_addr->addr (),
addr->resolved.tipc_addr->addrlen ());
#endif
// Connect was successful immediately.
if (rc == 0)
return 0;
// Translate other error codes indicating asynchronous connect has been
// launched to a uniform EINPROGRESS.
if (rc == -1 && errno == EINTR) {
errno = EINPROGRESS;
return -1;
}
// Forward the error.
return -1;
}
void zmq::tipc_connecter_t::close ()
{
zmq_assert (s != retired_fd);
int rc = ::close (s);
errno_assert (rc == 0);
socket->event_closed (endpoint, s);
s = retired_fd;
}
zmq::fd_t zmq::tipc_connecter_t::connect ()
{
// Following code should handle both Berkeley-derived socket
// implementations and Solaris.
int err = 0;
#if ZMQ_HAVE_VXWORKS
int len = sizeof (err);
#else
socklen_t len = sizeof (err);
#endif
int rc = getsockopt (s, SOL_SOCKET, SO_ERROR, (char *) &err, &len);
if (rc == -1)
err = errno;
if (err != 0) {
// Assert if the error was caused by 0MQ bug.
// Networking problems are OK. No need to assert.
errno = err;
errno_assert (errno == ECONNREFUSED || errno == ECONNRESET
|| errno == ETIMEDOUT || errno == EHOSTUNREACH
|| errno == ENETUNREACH || errno == ENETDOWN);
return retired_fd;
}
fd_t result = s;
s = retired_fd;
return result;
}
#endif