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
|
// $Id$
// Listens to multicast address. After first message received, will
// listen for 5 more seconds. Prints Mbits/sec received from client.
#include "ace/INET_Addr.h"
#include "ace/SOCK_Dgram_Mcast.h"
#include "ace/Reactor.h"
#include "ace/Get_Opt.h"
#include "ace/Thread_Manager.h"
#include "ace/Service_Config.h"
#include "ace/streams.h"
ACE_RCSID(Ntalker, ntalker, "$Id$")
#if defined (ACE_HAS_IP_MULTICAST)
// Network interface to subscribe to. This is hardware specific. use
// netstat(1M) to find whether your interface is le0 or ie0
static const ACE_TCHAR *INTERFACE = 0;
static const char *MCAST_ADDR = ACE_DEFAULT_MULTICAST_ADDR;
static const u_short UDP_PORT = ACE_DEFAULT_MULTICAST_PORT;
class Handler : public ACE_Event_Handler
{
// = TITLE
// Handle both multicast and stdin events.
public:
// = Initialization and termination methods.
Handler (u_short udp_port,
const char *ip_addr,
const ACE_TCHAR *interface,
ACE_Reactor &);
// Constructor.
~Handler (void);
// Destructor.
// Event demuxer hooks.
virtual int handle_input (ACE_HANDLE);
virtual int handle_close (ACE_HANDLE,
ACE_Reactor_Mask);
virtual ACE_HANDLE get_handle (void) const;
private:
ACE_SOCK_Dgram_Mcast mcast_;
// Multicast wrapper.
};
ACE_HANDLE
Handler::get_handle (void) const
{
return this->mcast_.get_handle ();
}
int
Handler::handle_input (ACE_HANDLE h)
{
char buf[BUFSIZ];
if (h == ACE_STDIN)
{
ssize_t result = ACE_OS::read (h, buf, BUFSIZ);
if (result > 0)
{
if (this->mcast_.send (buf, result) != result)
ACE_ERROR_RETURN ((LM_ERROR,
"%p\n",
"send error"),
-1);
return 0;
}
else if (result == -1)
ACE_ERROR_RETURN ((LM_ERROR,
"%p\n",
"can't read from STDIN"),
-1);
else // result == 0
{
ACE_Reactor::end_event_loop ();
return -1;
}
}
else
{
ACE_INET_Addr remote_addr;
// Receive message from multicast group.
ssize_t result = this->mcast_.recv (buf,
sizeof buf,
remote_addr);
if (result != -1)
{
ACE_DEBUG ((LM_DEBUG,
"received datagram from host %s on port %d bytes = %d\n",
remote_addr.get_host_name (),
remote_addr.get_port_number (),
result));
ACE_OS::write (ACE_STDERR, buf, result);
ACE_DEBUG ((LM_DEBUG,
"\n"));
return 0;
}
ACE_ERROR_RETURN ((LM_ERROR,
"%p\n",
"something amiss"),
-1);
}
}
int
Handler::handle_close (ACE_HANDLE h, ACE_Reactor_Mask)
{
if (h == ACE_STDIN)
{
ACE_DEBUG ((LM_DEBUG,
"STDIN_Events handle removed from reactor.\n"));
if (ACE_Reactor::instance ()->remove_handler
(this, ACE_Event_Handler::READ_MASK) == -1)
ACE_ERROR_RETURN ((LM_ERROR,
"%p\n",
"remove_handler"),
-1);
}
else
ACE_DEBUG ((LM_DEBUG,
"Mcast_Events handle removed from reactor.\n"));
return 0;
}
Handler::~Handler (void)
{
if (this->mcast_.unsubscribe () == -1)
ACE_ERROR ((LM_ERROR,
"%p\n",
"unsubscribe fails"));
}
Handler::Handler (u_short udp_port,
const char *ip_addr,
const ACE_TCHAR *interface,
ACE_Reactor &reactor)
{
// Create multicast address to listen on.
ACE_INET_Addr sockmc_addr (udp_port, ip_addr);
// subscribe to multicast group.
if (this->mcast_.subscribe (sockmc_addr, 1, interface) == -1)
ACE_ERROR ((LM_ERROR,
"%p\n",
"can't subscribe to multicast group"));
// Disable loopbacks.
// if (this->mcast_.set_option (IP_MULTICAST_LOOP, 0) == -1 )
// ACE_OS::perror (" can't disable loopbacks " ), ACE_OS::exit (1);
// Register callbacks with the ACE_Reactor.
else if (reactor.register_handler (this->mcast_.get_handle (),
this,
ACE_Event_Handler::READ_MASK) == -1)
ACE_ERROR ((LM_ERROR,
"%p\n",
"can't register with Reactor\n"));
// Register the STDIN handler.
else if (ACE_Event_Handler::register_stdin_handler (this,
ACE_Reactor::instance (),
ACE_Thread_Manager::instance ()) == -1)
ACE_ERROR ((LM_ERROR,
"%p\n",
"register_stdin_handler"));
}
static void
parse_args (int argc, ACE_TCHAR *argv[])
{
ACE_Get_Opt get_opt (argc, argv, ACE_TEXT("i:u"));
int c;
while ((c = get_opt ()) != -1)
switch (c)
{
case 'i':
INTERFACE = get_opt.opt_arg ();
break;
case 'u':
// Usage fallthrough.
default:
ACE_DEBUG ((LM_DEBUG,
"%s -i interface\n",
argv[0]));
ACE_OS::exit (1);
}
}
int
main (int argc, ACE_TCHAR *argv[])
{
parse_args (argc, argv);
Handler handler (UDP_PORT,
MCAST_ADDR,
INTERFACE,
*ACE_Reactor::instance ());
// Run the event loop.
ACE_Reactor::run_event_loop ();
ACE_DEBUG ((LM_DEBUG,
"talker Done.\n"));
return 0;
}
#else
int
main (int, ACE_TCHAR *argv[])
{
ACE_ERROR_RETURN ((LM_ERROR,
"error: %s must be run on a platform that support IP multicast\n",
argv[0]),
0);
}
#endif /* ACE_HAS_IP_MULTICAST */
|
