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
|
/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single TCP/UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
*
* Copyright (C) 2002-2005 OpenVPN Solutions LLC <info@openvpn.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef WIN32
#include "config-win32.h"
#else
#include "config.h"
#endif
#include "syshead.h"
#include "init.h"
#include "forward.h"
#include "multi.h"
#include "memdbg.h"
#include "forward-inline.h"
#define P2P_CHECK_SIG() EVENT_LOOP_CHECK_SIGNAL (c, process_signal_p2p, c);
static bool
process_signal_p2p (struct context *c)
{
remap_signal (c);
return process_signal (c);
}
static void
tunnel_point_to_point (struct context *c)
{
context_clear_2 (c);
/* set point-to-point mode */
c->mode = CM_P2P;
/* initialize tunnel instance */
init_instance_handle_signals (c, c->es, CC_HARD_USR1_TO_HUP);
if (IS_SIG (c))
return;
init_management_callback_p2p (c);
/* main event loop */
while (true)
{
perf_push (PERF_EVENT_LOOP);
/* process timers, TLS, etc. */
pre_select (c);
P2P_CHECK_SIG();
/* set up and do the I/O wait */
io_wait (c, p2p_iow_flags (c));
P2P_CHECK_SIG();
/* timeout? */
if (c->c2.event_set_status == ES_TIMEOUT)
{
perf_pop ();
continue;
}
/* process the I/O which triggered select */
process_io (c);
P2P_CHECK_SIG();
perf_pop ();
}
uninit_management_callback ();
/* tear down tunnel instance (unless --persist-tun) */
close_instance (c);
}
#undef PROCESS_SIGNAL_P2P
int
main (int argc, char *argv[])
{
struct context c;
#if PEDANTIC
fprintf (stderr, "Sorry, I was built with --enable-pedantic and I am incapable of doing any real work!\n");
return 1;
#endif
CLEAR (c);
/* signify first time for components which can
only be initialized once per program instantiation. */
c.first_time = true;
/* initialize program-wide statics */
if (init_static ())
{
/*
* This loop is initially executed on startup and then
* once per SIGHUP.
*/
do
{
/* zero context struct but leave first_time member alone */
context_clear_all_except_first_time (&c);
/* static signal info object */
CLEAR (siginfo_static);
c.sig = &siginfo_static;
/* initialize garbage collector scoped to context object */
gc_init (&c.gc);
/* initialize environmental variable store */
c.es = env_set_create (&c.gc);
#ifdef ENABLE_MANAGEMENT
/* initialize management subsystem */
init_management (&c);
#endif
/* initialize options to default state */
init_options (&c.options);
/* parse command line options, and read configuration file */
parse_argv (&c.options, argc, argv, M_USAGE, OPT_P_DEFAULT, NULL, c.es);
/* init verbosity and mute levels */
init_verb_mute (&c, IVM_LEVEL_1);
/* set dev options */
init_options_dev (&c.options);
/* openssl print info? */
if (print_openssl_info (&c.options))
break;
/* --genkey mode? */
if (do_genkey (&c.options))
break;
/* tun/tap persist command? */
if (do_persist_tuntap (&c.options))
break;
/* sanity check on options */
options_postprocess (&c.options, c.first_time);
/* show all option settings */
show_settings (&c.options);
/* print version number */
msg (M_INFO, "%s", title_string);
/* misc stuff */
pre_setup (&c.options);
/* test crypto? */
if (do_test_crypto (&c.options))
break;
#ifdef ENABLE_MANAGEMENT
/* open management subsystem */
if (!open_management (&c))
break;
#endif
/* set certain options as environmental variables */
setenv_settings (c.es, &c.options);
/* finish context init */
context_init_1 (&c);
do
{
/* run tunnel depending on mode */
switch (c.options.mode)
{
case MODE_POINT_TO_POINT:
tunnel_point_to_point (&c);
break;
#if P2MP_SERVER
case MODE_SERVER:
tunnel_server (&c);
break;
#endif
default:
ASSERT (0);
}
/* indicates first iteration -- has program-wide scope */
c.first_time = false;
/* any signals received? */
if (IS_SIG (&c))
print_signal (c.sig, NULL, M_INFO);
/* pass restart status to management subsystem */
signal_restart_status (c.sig);
}
while (c.sig->signal_received == SIGUSR1);
uninit_options (&c.options);
gc_reset (&c.gc);
}
while (c.sig->signal_received == SIGHUP);
}
context_gc_free (&c);
#ifdef ENABLE_MANAGEMENT
/* close management interface */
close_management ();
#endif
/* uninitialize program-wide statics */
uninit_static ();
openvpn_exit (OPENVPN_EXIT_STATUS_GOOD); /* exit point */
return 0; /* NOTREACHED */
}
|
