//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);
}
}
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
//ORIGINAL LINE: private void processMessageDNS(pspsharp.network.protocols.NetPacket packet, pspsharp.network.protocols.EtherFrame frame, pspsharp.network.protocols.IPv4 ipv4, pspsharp.network.protocols.UDP udp) throws java.io.EOFException
private void processMessageDNS(NetPacket packet, EtherFrame frame, IPv4 ipv4, UDP udp)
{
DNS dns = new DNS();
dns.read(packet);
//if (log.DebugEnabled)
{
Console.WriteLine(string.Format("processMessageDNS {0}", dns));
}
if (!dns.isResponseFlag && dns.questionCount == 1)
{
DNS.DNSRecord question = dns.questions[0];
string hostName = question.recordName;
DNS answerDns = new DNS(dns);
try
{
InetAddress inetAddress = InetAddress.getByName(hostName);
//if (log.DebugEnabled)
{
Console.WriteLine(string.Format("DNS response '{0}'={1}", hostName, inetAddress));
}
DNS.DNSAnswerRecord answer = new DNS.DNSAnswerRecord();
answer.recordName = hostName;
answer.recordClass = question.recordClass;
answer.recordType = question.recordType;
answer.data = inetAddress.Address;
answer.dataLength = answer.data.Length;
answerDns.responseCode = DNS_RESPONSE_CODE_NO_ERROR;
answerDns.answerRecordCount = 1;
answerDns.answerRecords = new DNS.DNSAnswerRecord[] { answer };
}
catch (UnknownHostException e)
{
answerDns.responseCode = DNS_RESPONSE_CODE_NAME_ERROR;
//if (log.DebugEnabled)
{
Console.WriteLine(string.Format("processMessageDNS unknown host '{0}'({1})", hostName, e.ToString()));
}
}
answerDns.isResponseFlag = true;
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.
UDP answerUdp = new UDP(udp);
answerUdp.swapSourceAndDestination();
// Update lengths and checksums
answerUdp.Length = answerUdp.sizeOf() + answerDns.sizeOf();
answerUdp.computeChecksum();
answerIPv4.totalLength = answerIPv4.sizeOf() + answerUdp.Length;
answerIPv4.computeChecksum();
// Write the different headers in sequence
NetPacket answerPacket = new NetPacket(BUFFER_SIZE);
answerFrame.write(answerPacket);
answerIPv4.write(answerPacket);
answerUdp.write(answerPacket);
answerDns.write(answerPacket);
sendPacket(answerPacket);
}
}
