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
|
// Server.C
// $Id$
//
// 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"
#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 char *INTERFACE = "le0";
static const char *MCAST_ADDR = ACE_DEFAULT_MULTICAST_ADDR;
static const u_short UDP_PORT = ACE_DEFAULT_MULTICAST_PORT;
// Handle both multicast and stdin events.
class Handle_Events : public ACE_Event_Handler
{
public:
Handle_Events (u_short udp_port,
const char *ip_addr,
const char *interface,
ACE_Reactor &reactor);
~Handle_Events (void);
virtual int handle_input (ACE_HANDLE);
virtual int handle_close (ACE_HANDLE, ACE_Reactor_Mask);
private:
ACE_SOCK_Dgram_Mcast mcast_;
ACE_Handle_Set handle_set_;
};
int
Handle_Events::handle_input (ACE_HANDLE h)
{
char buf[BUFSIZ];
if (h == 0)
{
int readresult = ACE_OS::read (h, buf, BUFSIZ);
if (readresult > 0)
{
if (this->mcast_.send (buf, readresult) != readresult)
{
ACE_OS::perror ("send error");
return -1;
}
return 0;
}
else if (readresult == -1)
::perror ("can't read from STDIN");
return -1;
}
else
{
ACE_INET_Addr remote_addr;
// receive message from multicast group
int retcode = this->mcast_.recv (buf, sizeof buf, remote_addr);
if (retcode != -1)
{
cout << "received datagram from host " << remote_addr.get_host_name ()
<< " on port " << remote_addr.get_port_number ()
<< " bytes = " << retcode << endl;
ACE_OS::write (ACE_STDOUT, buf, retcode);
cout << endl;
return 0;
}
ACE_OS::perror ("Something amiss.");
return -1;
}
}
int
Handle_Events::handle_close (ACE_HANDLE h, ACE_Reactor_Mask)
{
if (h == 0)
cout << "STDIN_Events handle removed from reactor." << endl << flush;
else
cout << "Mcast_Events handle removed from reactor." << endl << flush;
return 0;
}
Handle_Events::~Handle_Events (void)
{
// ACE_OS::exit on error (bogus)...
if (this->mcast_.unsubscribe () == -1)
ACE_OS::perror ("unsubscribe fails"), ACE_OS::exit (1);
}
Handle_Events::Handle_Events (u_short udp_port,
const char *ip_addr,
const char *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_OS::perror ("can't subscribe to multicast group"), ACE_OS::exit (1);
// disable loopbacks
// if (this->mcast_.set_option (IP_MULTICAST_LOOP, 0) == -1 )
// ACE_OS::perror (" can't disable loopbacks " ), ACE_OS::exit (1);
this->handle_set_.set_bit (0);
this->handle_set_.set_bit (this->mcast_.get_handle ());
// Register callbacks with the ACE_Reactor.
if (reactor.register_handler (this->handle_set_,
this,
ACE_Event_Handler::READ_MASK) == -1)
ACE_OS::perror ("can't register events"), ACE_OS::exit (1);
}
static void
parse_args (int argc, char *argv[])
{
ACE_Get_Opt get_opt (argc, argv, "i:u");
int c;
while ((c = get_opt ()) != -1)
switch (c)
{
case 'i':
INTERFACE = get_opt.optarg;
break;
case 'u':
// Usage fallthrough.
default:
ACE_DEBUG ((LM_DEBUG, "%s -i interface\n", argv[0]));
ACE_OS::exit (1);
}
}
static sig_atomic_t done = 0;
// Signal handler.
extern "C" void
handler (int)
{
done = 1;
}
int
main (int argc, char *argv[])
{
ACE_Sig_Action sa ((ACE_SignalHandler) handler, SIGINT);
parse_args (argc, argv);
ACE_Reactor reactor;
Handle_Events handle_events (UDP_PORT, MCAST_ADDR, INTERFACE, reactor);
// main loop
while (!done)
reactor.handle_events ();
cout << "\ntalker Done.\n";
return 0;
}
#else
int
main (int argc, char *argv[])
{
ACE_ERROR ((LM_ERROR, "error: %s must be run on a platform that support IP multicast\n",
argv[0]));
return 0;
}
#endif /* ACE_HAS_IP_MULTICAST */
|
