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
|
-----------------------------------------------------------------------------
-- --
-- ADASOCKETS COMPONENTS --
-- --
-- S O C K E T S . M U L T I C A S T --
-- --
-- B o d y --
-- --
-- $ReleaseVersion: 0.1.3 $ --
-- --
-- Copyright (C) 1998 École Nationale Supérieure des Télécommunications --
-- --
-- AdaSockets is free software; you can redistribute it and/or modify --
-- it under terms of the GNU General Public License as published by --
-- the Free Software Foundation; either version 2, or (at your option) --
-- any later version. AdaSockets 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 distributed --
-- with AdaSockets; see file COPYING. If not, write to the Free --
-- Software Foundation, 59 Temple Place - Suite 330, Boston, MA --
-- 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from --
-- this unit, or you link this unit with other files to produce an --
-- executable, this unit does not by itself cause the resulting --
-- executable to be covered by the GNU General Public License. This --
-- exception does not however invalidate any other reasons why the --
-- executable file might be covered by the GNU Public License. --
-- --
-- The main repository for this software is located at: --
-- http://www-inf.enst.fr/ANC/ --
-- --
-----------------------------------------------------------------------------
with Ada.Exceptions; use Ada.Exceptions;
with Interfaces.C; use Interfaces.C;
with Sockets.Constants; use Sockets.Constants;
with Sockets.Naming; use Sockets.Naming;
with Sockets.Thin; use Sockets.Thin;
with Sockets.Utils; use Sockets.Utils;
package body Sockets.Multicast is
use Ada.Streams;
procedure Setsockopt_Add_Membership is
new Customized_Setsockopt (IPPROTO_IP, IP_ADD_MEMBERSHIP, Ip_Mreq);
-----------------------------
-- Create_Multicast_Socket --
-----------------------------
function Create_Multicast_Socket
(Group : String;
Port : Positive;
TTL : Positive := 16;
Self_Loop : Boolean := True)
return Multicast_Socket_FD
is
Result : Multicast_Socket_FD;
Mreq : aliased Ip_Mreq;
C_Self_Loop : Integer;
begin
Socket (Socket_FD (Result), AF_INET, SOCK_DGRAM);
if Self_Loop then
C_Self_Loop := 1;
else
C_Self_Loop := 0;
end if;
Setsockopt (Result, SOL_SOCKET, SO_REUSEADDR, 1);
Bind (Result, Port);
Mreq.Imr_Multiaddr := To_In_Addr (Address_Of (Group));
Setsockopt_Add_Membership (Result, Mreq);
Setsockopt (Result, IPPROTO_IP, IP_MULTICAST_TTL, TTL);
Setsockopt (Result, IPPROTO_IP, IP_MULTICAST_LOOP, C_Self_Loop);
Result.Target := (Result.Target'Size / 8,
Constants.Af_Inet,
Port_To_Network (unsigned_short (Port)),
To_In_Addr (Address_Of (Group)),
(others => char'Val (0)));
return Result;
end Create_Multicast_Socket;
----------
-- Send --
----------
procedure Send (Socket : in Multicast_Socket_FD;
Data : in Stream_Element_Array)
is
Sin : aliased Sockaddr_In := Socket.Target;
Index : Stream_Element_Offset := Data'First;
Rest : Stream_Element_Count := Data'Length;
Count : int;
begin
while Rest > 0 loop
Count := C_Sendto (Socket.FD,
Data (Index) 'Address,
int (Rest),
0,
Sin'Address,
Sin'Size / 8);
if Count < 0 then
Raise_With_Message ("Send failed");
elsif Count = 0 then
raise Connection_Closed;
end if;
Index := Index + Stream_Element_Count (Count);
Rest := Rest - Stream_Element_Count (Count);
end loop;
end Send;
------------
-- Socket --
------------
procedure Socket
(Sock : out Multicast_Socket_FD;
Domain : in Socket_Domain := AF_INET;
Typ : in Socket_Type := SOCK_STREAM)
is
begin
Raise_Exception (Program_Error'Identity,
"Use Create_Multicast_Socket instead");
Sock := Sock; -- To keep the compiler happy
end Socket;
end Sockets.Multicast;
|
