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PaketAnalyzer.java
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PaketAnalyzer.java
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import java.io.IOException;
public class PaketAnalyzer {
int packetSize;
String destinationMAC;
String sourceMAC;
byte[] data;
String etherType;
int ipv;
int headerSize;
int totalLengthIP;
int IpID;
int DSCPval;
int ECN;
int DF;
int MF;
int fragOffset;
int TTL;
int Protocol;
String ProtocolStr;
String HeaderCheckSum;
String SourceIPAddr;
String DestIPAddr;
String IPOpt;
int OptionsOffset;
/* ICMP Fields */
int ICMPtype;
int ICMPcode;
String ICMPCheckSum;
/* TCP Fields */
int TCPSourcePort;
int TCPDestPort;
int TCPSeqNum;
int TCPAckNum;
int TCPDataOffset;
int TCPUrg;
int TCPAck;
int TCPPush;
int TCPReset;
int TCPFin;
int TCPSyn;
String Urg;
String Ack;
String Push;
String Reset;
String Fin;
String Syn;
int TCPWindowSize;
String TCPChecksum;
int TCPurgPointer;
String TCPOptions;
/* data field shared across packets */
String hexData;
/* UDP fields */
int UDPSourcePort;
int UDPDestinationPort;
int UDPLength;
String UDPCheckSum;
public PaketAnalyzer(String filename) throws IOException {
data = Utils.readFile(filename);
}
public void processEther() {
/* ETHER */
packetSize = data.length;
destinationMAC = Utils.setDestinationMAC(data);
sourceMAC = Utils.setSourceMAC(data);
etherType = Utils.setEtherType(data);
/* END ETHER */
}
public void processIPv4() {
ipv = Utils.setIPVersion(data);
headerSize = Utils.setHeaderLen(data);
totalLengthIP = Utils.setTotalLength(data);
IpID = Utils.setIpId(data);
DSCPval = Utils.setDSCP(data);
ECN = Utils.setECN(data);
DF = Utils.setDFflag(data);
MF = Utils.setMFflag(data);
fragOffset = Utils.setFragOffset(data);
Protocol = Utils.setProtocol(data);
ProtocolStr = Utils.chooseProtocol(Protocol);
HeaderCheckSum = Utils.setHeaderChecksum(data);
SourceIPAddr = Utils.setSourceIP(data);
DestIPAddr = Utils.setDestinationIP(data);
TTL = Utils.setTTL(data);
IPOpt = Utils.setIPv4Options(data, headerSize);
OptionsOffset = Utils.setOptionsOffset(headerSize);
}
public void processICMP() {
ICMPtype = Utils.setICMPType(data, OptionsOffset);
ICMPcode = Utils.setICMPCode(data, OptionsOffset);
ICMPCheckSum = Utils.setICMPCheckSum(data, OptionsOffset);
}
public void processTCP() {
TCPSourcePort = Utils.setTCPSourcePort(data, OptionsOffset);
TCPDestPort = Utils.setTCPDestPort(data, OptionsOffset);
TCPSeqNum = Utils.setSequenceNum(data, OptionsOffset);
// !!! IMPORTANT
TCPAckNum = Utils.setAckNum(data, OptionsOffset);
TCPDataOffset = Utils.setTCPDataOffset(data, OptionsOffset);
TCPUrg = Utils.setTCPUrg(data, OptionsOffset);
TCPAck = Utils.setTCPAck(data, OptionsOffset);
TCPPush = Utils.setTCPPush(data, OptionsOffset);
TCPReset = Utils.setTCPReset(data, OptionsOffset);
TCPSyn = Utils.setTCPSyn(data, OptionsOffset);
TCPFin = Utils.setTCPFin(data, OptionsOffset);
TCPWindowSize = Utils.setWindowSize(data, OptionsOffset);
TCPChecksum = Utils.setTCPChecksum(data, OptionsOffset);
TCPurgPointer = Utils.setTCPUrgPointer(data, OptionsOffset);
TCPOptions = Utils.setTCPOptions(TCPDataOffset);
hexData = Utils.setTCPData(data, TCPDataOffset, OptionsOffset, headerSize);
}
public void processUDP() {
UDPSourcePort = Utils.setUDPSourcePort(data, OptionsOffset);
UDPDestinationPort = Utils.setUDPDestinationPort(data, OptionsOffset);
UDPLength = Utils.setUDPLength(data, OptionsOffset);
UDPCheckSum = Utils.setUDPChecksum(data, OptionsOffset);
hexData = Utils.setUDPData(data, 8, OptionsOffset, headerSize);
}
public String getProtocolStr() {
return ProtocolStr;
}
public int getProtocol() {
return Protocol;
}
public String printEther() {
return String.format( """
ETHER:\t----- Ether Header -----
ETHER:\t
ETHER:\tPacket size = %2d bytes
ETHER:\tDestination = %s
ETHER:\tSource = %s
ETHER:\tEthertype = %s (IP)
ETHER:\t
""", packetSize, destinationMAC, sourceMAC, etherType);
}
public String printIP() {
return String.format("""
IP:\t----- IP Header -----
IP:\t
IP:\tVersion = %2d
IP:\tHeader length = %2d bytes
IP:\tDSCP = %2d
IP:\tECN = %2d
IP:\tTotal length = %2d bytes
IP:\tIdentification = %2d
IP:\tFlags:
IP:\t\tDF = %2d
IP:\t\tMF = %2d
IP:\tFragment offset = %2d bytes
IP:\tTime to live = %2d seconds/hops
IP:\tProtocol = %s
IP:\tHeader checksum = %s
IP:\tSource address = %s
IP:\tDestination address = %s
IP:\t%s
IP:\t
""", ipv, headerSize, DSCPval, ECN, totalLengthIP, IpID, DF, MF, fragOffset, TTL, ProtocolStr,
HeaderCheckSum, SourceIPAddr, DestIPAddr, IPOpt);
}
public String printICMP() {
return String.format("""
ICMP:\t----- ICMP Header -----
ICMP:\t
ICMP:\tType = %2d
ICMP:\tCode = %2d
ICMP:\tChecksum = %s
ICMP:\t
""", ICMPtype, ICMPcode, ICMPCheckSum);
}
public void setTCPFlagsStr() {
if (TCPUrg > 0) this.Urg = "Urgent pointer";
else this.Urg = "No urgent pointer";
if (TCPAck > 0) this.Ack = "Acknowledgement";
else this.Ack = "No acknowledgement";
if (TCPPush > 0) this.Push = "Push";
else this.Push = "No push";
if (TCPReset > 0) this.Reset = "Reset";
else this.Reset = "No reset";
if (TCPSyn > 0) this.Syn = "Syn";
else this.Syn = "No Syn";
if (TCPFin > 0) this.Fin = "Fin";
else this.Fin = "No Fin";
}
public String printTCPFlags() {
String bin = "" + TCPUrg + TCPAck + TCPPush + TCPReset + TCPSyn + TCPFin;
setTCPFlagsStr();
return String.format("""
Flags = %s
\t\t\t..%1d. .... = %s
\t\t\t...%1d .... = %s
\t\t\t.... %1d... = %s
\t\t\t.... .%1d.. = %s
\t\t\t.... ..%1d. = %s
\t\t\t.... ...%1d = %s""", "0x" + Integer.toHexString(Integer.parseInt(bin, 2)), TCPUrg, Urg, TCPAck, Ack,
TCPPush, Push, TCPReset, Reset, TCPSyn, Syn, TCPFin, Fin);
}
// public String printTCPData() {
//
// }
public String printTCP() {
String flags = printTCPFlags();
return String.format("""
TCP:\t----- TCP Header -----
TCP:\t
TCP:\tSource port = %2d
TCP:\tDestination port = %2d
TCP:\tSequence number = %s
TCP:\tAcknowledgement number = %s
TCP:\tData offset = %2d bytes
TCP:\t%s
TCP:\tWindow = %2d
TCP:\tChecksum = %s
TCP:\tUrgent pointer = %2d
TCP:\t%s
TCP:\tData: (first 64 bytes)
%s
""", TCPSourcePort, TCPDestPort, Integer.toUnsignedString(TCPSeqNum), Integer.toUnsignedString(TCPAckNum),
TCPDataOffset, flags, TCPWindowSize, TCPChecksum,
TCPurgPointer, TCPOptions, TCPdataHexdump());
}
public String printUPD() {
return String.format("""
UDP:\t----- UDP Header -----
UDP:\t
UDP:\tSource port = %2d
UDP:\tDestination port = %2d
UDP:\tLength = %2d
UDP:\tChecksum = %s
UDP:\t
UDP:\tData: (first 64 bytes)
%s
""", UDPSourcePort, UDPDestinationPort, UDPLength, UDPCheckSum, UDPdataHexdump());
}
public String TCPdataHexdump() {
int groupCount = 0;
int charCount = 0;
int row = 0;
StringBuilder res = new StringBuilder();
res.append("TCP:\t");
for (int i = 0; i<hexData.length(); i++) {
if (charCount == 4) {
charCount = 0;
groupCount++;
res.append(" ");
}
if(groupCount == 8) {
groupCount = 0;
res.append("\t\t\t");
res.append(hexToASCII(row, i));
row = i;
res.append("\n");
res.append("TCP:\t");
charCount = 0;
// groupCount++;
}
res.append(hexData.charAt(i));
charCount++;
}
res.append("\t\t\t");
res.append(hexToASCII(row, hexData.length()));
return res.toString();
}
public String UDPdataHexdump() {
int groupCount = 0;
int charCount = 0;
int row = 0;
StringBuilder res = new StringBuilder();
res.append("UDP:\t");
for (int i = 0; i<hexData.length(); i++) {
if (charCount == 4) {
charCount = 0;
groupCount++;
res.append(" ");
}
if(groupCount == 8) {
groupCount = 0;
res.append("\t\t\t");
res.append(hexToASCII(row, i));
row = i;
res.append("\n");
res.append("UDP:\t");
charCount = 0;
// groupCount++;
}
res.append(hexData.charAt(i));
charCount++;
}
res.append("\t\t\t");
res.append(hexToASCII(row, hexData.length()));
return res.toString();
}
public String hexToASCII(int start, int end) {
StringBuilder output = new StringBuilder();
for (int i = start; i < end; i+=2) {
String str = hexData.substring(i, i+2);
int decimal = Integer.parseInt(str, 16);
output.append((char) decimal);
}
return output.toString();
}
}