//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
//ORIGINAL LINE: private void sendICMPEchoResponse(pspsharp.network.protocols.NetPacket packet, pspsharp.network.protocols.EtherFrame frame, pspsharp.network.protocols.IPv4 ipv4, pspsharp.network.protocols.ICMP icmp) throws java.io.EOFException
private void sendICMPEchoResponse(NetPacket packet, EtherFrame frame, IPv4 ipv4, ICMP icmp)
{
bool reachable = false;
try
{
InetAddress inetAddress = InetAddress.getByAddress(ipv4.destinationIPAddress);
// Timeout after 1 second
reachable = inetAddress.isReachable(null, ipv4.timeToLive, 1000);
}
catch (UnknownHostException)
{
}
catch (IOException)
{
}
if (reachable)
{
// See https://en.wikipedia.org/wiki/Ping_(networking_utility)
EtherFrame answerFrame = new EtherFrame(frame);
answerFrame.swapSourceAndDestination();
IPv4 answerIPv4 = new IPv4(ipv4);
answerIPv4.swapSourceAndDestination();
answerIPv4.timeToLive--; // When a packet arrives at a router, the router decreases the TTL FieldInfo.
ICMP answerIcmp = new ICMP(icmp);
answerIcmp.type = ICMP.ICMP_CONTROL_ECHO_REPLY;
answerIcmp.computeChecksum();
answerIPv4.totalLength = answerIPv4.sizeOf() + answerIcmp.sizeOf();
answerIPv4.computeChecksum();
// Write the different headers in sequence
NetPacket answerPacket = new NetPacket(BUFFER_SIZE);
answerFrame.write(answerPacket);
answerIPv4.write(answerPacket);
answerIcmp.write(answerPacket);
sendPacket(answerPacket);
}
}
