1/**********
2This library is free software; you can redistribute it and/or modify it under
3the terms of the GNU Lesser General Public License as published by the
4Free Software Foundation; either version 3 of the License, or (at your
5option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
6
7This library is distributed in the hope that it will be useful, but WITHOUT
8ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
9FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
10more details.
11
12You should have received a copy of the GNU Lesser General Public License
13along with this library; if not, write to the Free Software Foundation, Inc.,
1451 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
15**********/
16// "mTunnel" multicast access service
17// Copyright (c) 1996-2020 Live Networks, Inc. All rights reserved.
18// IO event handlers
19// Implementation
20
21#include "IOHandlers.hh"
22#include "TunnelEncaps.hh"
23
24//##### TEMP: Use a single buffer, sized for UDP tunnels:
25//##### This assumes that the I/O handlers are non-reentrant
26static unsigned const maxPacketLength = 50*1024; // bytes
27 // This is usually overkill, because UDP packets are usually no larger
28 // than the typical Ethernet MTU (1500 bytes). However, I've seen
29 // reports of Windows Media Servers sending UDP packets as large as
30 // 27 kBytes. These will probably undego lots of IP-level
31 // fragmentation, but that occurs below us. We just have to hope that
32 // fragments don't get lost.
33static unsigned const ioBufferSize
34 = maxPacketLength + TunnelEncapsulationTrailerMaxSize;
35static unsigned char ioBuffer[ioBufferSize];
36
37
38void socketReadHandler(Socket* sock, int /*mask*/) {
39 unsigned bytesRead;
40 struct sockaddr_in fromAddress;
41 UsageEnvironment& saveEnv = sock->env();
42 // because handleRead(), if it fails, may delete "sock"
43 if (!sock->handleRead(ioBuffer, ioBufferSize, bytesRead, fromAddress)) {
44 saveEnv.reportBackgroundError();
45 }
46}
47