STRLCPY/100-redteam-projects

Merge pull request #12 from AugustoSavi/master

[4] Server for file transfers - <Java> | AugustoSavi

Héber Júlio committed with GitHub 2 years ago

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Projects/4_Server_for_file_transfers/README.md

1	+	# Server for file transfers
2	+
3	+	## :information_source: technologies used
4	+
5	+	* Java 11
6	+
7	+	## :information_source: How use?
8	+	```bash
9	+	# Clone the repository
10	+	$ git clone https://github.com/kurogai/100-redteam-projects
11	+
12	+	# Enter the repository
13	+	$ cd 100-redteam-projects/4_Server_for_file_transfers
14	+
15	+	# Open a terminal and run
16	+	$ cd src/com/server/ && java Server.java
17	+
18	+	# Open a new terminal and run
19	+	$ cd src/com/client/ && java Client.java
20	+	```
21	+
22	+	## Developer
23	+
24	+	[<img src="https://avatars.githubusercontent.com/u/32443720?v=4" width=115 > <br> <sub> Augusto Savi </sub>](https://github.com/AugustoSavi) \|
25	+	\| :---: \|
26	+

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Projects/4_Server_for_file_transfers/src/com/client/Client.java

1	+	package com.client;
2	+
3	+	import javax.swing.*;
4	+	import java.awt.*;
5	+	import java.io.DataInputStream;
6	+	import java.io.DataOutputStream;
7	+	import java.io.File;
8	+	import java.io.FileInputStream;
9	+	import java.net.Socket;
10	+
11	+	public class Client {
12	+	private static DataOutputStream dataOutputStream = null;
13	+	private static DataInputStream dataInputStream = null;
14	+	private static String HOST= "localhost";
15	+	private static Integer PORT= 5000;
16	+
17	+	public static void main(String[] args) {
18	+	while (true) {
19	+	try {
20	+	JFileChooser file = new JFileChooser() {
21	+	@Override
22	+	protected JDialog createDialog(Component parent) throws HeadlessException {
23	+	// intercept the dialog created by JFileChooser
24	+	JDialog dialog = super.createDialog(parent);
25	+	dialog.setModal(true); // set modality (or setModalityType)
26	+	dialog.setAlwaysOnTop(true);
27	+	return dialog;
28	+	}
29	+	};
30	+	file.setFileSelectionMode(JFileChooser.FILES_ONLY);
31	+
32	+	int i = file.showSaveDialog(null);
33	+	if (1 == i) {
34	+	System.out.println("Arquivo não informado");
35	+	break;
36	+	} else {
37	+	Socket socket = new Socket(HOST,PORT);
38	+
39	+	dataInputStream = new DataInputStream(socket.getInputStream());
40	+	dataOutputStream = new DataOutputStream(socket.getOutputStream());
41	+
42	+	File arquivo = file.getSelectedFile();
43	+	sendFile(arquivo.getPath());
44	+	dataInputStream.close();
45	+	dataInputStream.close();
46	+	socket.close();
47	+	}
48	+	} catch (Exception e) {
49	+	e.printStackTrace();
50	+	}
51	+	}
52	+	}
53	+
54	+	private static void sendFile(String path) throws Exception{
55	+	int bytes = 0;
56	+	File file = new File(path);
57	+	FileInputStream fileInputStream = new FileInputStream(file);
58	+
59	+	// send file size
60	+	dataOutputStream.writeUTF(file.getName());
61	+	dataOutputStream.writeLong(file.length());
62	+
63	+	// break file into chunks
64	+	byte[] buffer = new byte[4*1024];
65	+	while ((bytes=fileInputStream.read(buffer))!=-1){
66	+	dataOutputStream.write(buffer,0,bytes);
67	+	dataOutputStream.flush();
68	+	}
69	+	fileInputStream.close();
70	+	}
71	+	}

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Projects/4_Server_for_file_transfers/src/com/server/Server.java

1	+	package com.server;
2	+
3	+	import java.io.DataInputStream;
4	+	import java.io.DataOutputStream;
5	+	import java.io.FileOutputStream;
6	+	import java.net.ServerSocket;
7	+	import java.net.Socket;
8	+
9	+	public class Server {
10	+	private static DataOutputStream dataOutputStream = null;
11	+	private static DataInputStream dataInputStream = null;
12	+	private static Integer PORT= 5000;
13	+
14	+	public static void main(String[] args) {
15	+	while (true){
16	+	try(ServerSocket serverSocket = new ServerSocket(PORT)){
17	+	System.out.println("listening to port: " + PORT);
18	+	Socket clientSocket = serverSocket.accept();
19	+	System.out.println(clientSocket+" connected.");
20	+
21	+	dataInputStream = new DataInputStream(clientSocket.getInputStream());
22	+	dataOutputStream = new DataOutputStream(clientSocket.getOutputStream());
23	+
24	+	receiveFile(dataInputStream.readUTF());
25	+
26	+	dataInputStream.close();
27	+	dataOutputStream.close();
28	+	clientSocket.close();
29	+	} catch (Exception e){
30	+	e.printStackTrace();
31	+	}
32	+	}
33	+	}
34	+
35	+	private static void receiveFile(String fileName) throws Exception{
36	+	int bytes = 0;
37	+	FileOutputStream fileOutputStream = new FileOutputStream(fileName);
38	+
39	+	long size = dataInputStream.readLong(); // read file size
40	+	byte[] buffer = new byte[4*1024];
41	+	while (size > 0 && (bytes = dataInputStream.read(buffer, 0, (int)Math.min(buffer.length, size))) != -1) {
42	+	fileOutputStream.write(buffer,0,bytes);
43	+	size -= bytes; // read upto file size
44	+	}
45	+	fileOutputStream.close();
46	+	}
47	+	}
48	+

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Projects/5_Caesar_Cipher_tool/.gitignore

1	+	/target/
2	+	!.mvn/wrapper/maven-wrapper.jar
3	+
4	+	### STS ###
5	+	.apt_generated
6	+	.classpath
7	+	.factorypath
8	+	.project
9	+	.settings
10	+	.springBeans
11	+	.sts4-cache
12	+
13	+	### IntelliJ IDEA ###
14	+	.idea
15	+	*.iws
16	+	*.iml
17	+	*.ipr
18	+
19	+	### NetBeans ###
20	+	/nbproject/private/
21	+	/build/
22	+	/nbbuild/
23	+	/dist/
24	+	/nbdist/
25	+	/.nb-gradle/
26	+
27	+	*.xml.versionsBackup

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Projects/5_Caesar_Cipher_tool/README.md

1	+	<h1 align="center">Caesar Cipher tool</h1>
2	+
3	+	## :information_source: technologies used
4	+
5	+	* Java
6	+
7	+	<h2 align="center"> Encrypt </h2>
8	+
9	+	![image](https://user-images.githubusercontent.com/32443720/161679424-cc0fc73f-2837-4ece-b8a0-5faec3cb016b.png)
10	+
11	+	<h2 align="center"> Decrypt </h2>
12	+
13	+	![image](https://user-images.githubusercontent.com/32443720/161679536-6b60c399-3a74-49b1-9788-7c6b52155ded.png)
14	+
15	+
16	+
17	+	```java
18	+	private String cipher(String message, int offset) {
19	+	StringBuilder result = new StringBuilder();
20	+	for (char character : message.toCharArray()) {
21	+	if (character != ' ') {
22	+	int originalAlphabetPosition = character - 'a';
23	+	int newAlphabetPosition = (originalAlphabetPosition + offset) % 26;
24	+	char newCharacter = (char) ('a' + newAlphabetPosition);
25	+	result.append(newCharacter);
26	+	} else {
27	+	result.append(character);
28	+	}
29	+	}
30	+	return result.toString();
31	+	}
32	+	```
33	+
34	+	## :books: References
35	+
36	+	https://www.geeksforgeeks.org/caesar-cipher-in-cryptography/

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Projects/5_Caesar_Cipher_tool/src/Main.java

1	+	import javax.swing.*;
2	+	import javax.swing.border.EmptyBorder;
3	+	import javax.swing.event.DocumentEvent;
4	+	import javax.swing.event.DocumentListener;
5	+	import javax.swing.text.BadLocationException;
6	+	import javax.swing.text.NumberFormatter;
7	+	import java.text.NumberFormat;
8	+
9	+	public class Main extends JFrame {
10	+	private final JLabel labelInput, labelOutput, labelOffset;
11	+	private final JScrollPane scrollPaneInput, scrollPaneOutput;
12	+	private final JTextArea textAreaInput, textAreaOutput;
13	+	private final JFormattedTextField jTextFieldOffset;
14	+	private final JToggleButton jToggleButton;
15	+	private int offset = 3;
16	+	private String message = "";
17	+
18	+	public Main() {
19	+	JPanel contentPane = new JPanel();
20	+	setTitle("Caesar Cipher tool");
21	+	setResizable(false);
22	+	setBounds(100, 100, 800, 600);
23	+	contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
24	+	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
25	+	setContentPane(contentPane);
26	+	contentPane.setLayout(null);
27	+
28	+	//toggle
29	+	jToggleButton = new JToggleButton("Decrypt");
30	+	jToggleButton.setBounds(90, 5 , 100,20);
31	+	jToggleButton.addActionListener(actionEvent -> {
32	+	if (jToggleButton.isSelected()) {
33	+	jToggleButton.setText("Encrypt");
34	+	cipherDecipher(message,offset);
35	+	}
36	+	else {
37	+	jToggleButton.setText("Decrypt");
38	+	cipherDecipher(message,offset);
39	+	}
40	+	});
41	+	contentPane.add(jToggleButton);
42	+
43	+	//offset
44	+	labelOffset = new JLabel("Offset:");
45	+	labelOffset.setBounds(265, 0 , 146,29);
46	+
47	+	NumberFormat longFormat = NumberFormat.getIntegerInstance();
48	+	NumberFormatter numberFormatter = new NumberFormatter(longFormat);
49	+	numberFormatter.setValueClass(Long.class); //optional, ensures you will always get a long value
50	+	numberFormatter.setMinimum(1L); //Optional
51	+	numberFormatter.setMaximum(28L); //Optional
52	+
53	+	jTextFieldOffset = new JFormattedTextField(numberFormatter);
54	+	jTextFieldOffset.setBounds(320, 5 , 30,20);
55	+	jTextFieldOffset.setText("3");
56	+	jTextFieldOffset.getDocument().addDocumentListener(new DocumentListener() {
57	+	@Override
58	+	public void insertUpdate(DocumentEvent documentEvent) {
59	+	offset = Integer.parseInt(jTextFieldOffset.getText());
60	+	cipherDecipher(message,offset);
61	+	}
62	+
63	+	@Override
64	+	public void removeUpdate(DocumentEvent documentEvent) {}
65	+
66	+	@Override
67	+	public void changedUpdate(DocumentEvent documentEvent) {
68	+	offset = Integer.parseInt(jTextFieldOffset.getText());
69	+	cipherDecipher(message,offset);
70	+	}
71	+	});
72	+
73	+	contentPane.add(labelOffset);
74	+	contentPane.add(jTextFieldOffset);
75	+
76	+	//input
77	+	labelInput = new JLabel("Input:");
78	+	labelInput.setBounds(10, 0, 146, 29);
79	+	contentPane.add(labelInput);
80	+
81	+	scrollPaneInput = new JScrollPane();
82	+	scrollPaneInput.setEnabled(false);
83	+	scrollPaneInput.setBounds(10, 30, 780, 250);
84	+
85	+	textAreaInput = new JTextArea();
86	+	textAreaInput.getDocument().addDocumentListener(new DocumentListener() {
87	+	@Override
88	+	public void insertUpdate(DocumentEvent documentEvent) {
89	+	try {
90	+	message = documentEvent.getDocument().getText(0, documentEvent.getDocument().getLength());
91	+	cipherDecipher(message,offset);
92	+	} catch (BadLocationException e) {
93	+	e.printStackTrace();
94	+	}
95	+	}
96	+
97	+	@Override
98	+	public void removeUpdate(DocumentEvent documentEvent) {
99	+	try {
100	+	message = documentEvent.getDocument().getText(0, documentEvent.getDocument().getLength());
101	+	cipherDecipher(message,offset);
102	+	} catch (BadLocationException e) {
103	+	e.printStackTrace();
104	+	}
105	+
106	+	}
107	+
108	+	@Override
109	+	public void changedUpdate(DocumentEvent documentEvent) {
110	+	try {
111	+	message = documentEvent.getDocument().getText(0, documentEvent.getDocument().getLength());
112	+	cipherDecipher(message,offset);
113	+	} catch (BadLocationException e) {
114	+	e.printStackTrace();
115	+	}
116	+
117	+	}
118	+	});
119	+	scrollPaneInput.setViewportView(textAreaInput);
120	+	contentPane.add(scrollPaneInput);
121	+
122	+	//output
123	+	labelOutput = new JLabel("Output:");
124	+	labelOutput.setBounds(10, 275, 146, 29);
125	+
126	+	scrollPaneOutput = new JScrollPane();
127	+	scrollPaneOutput.setEnabled(false);
128	+	scrollPaneOutput.setBounds(10, 300, 780, 250);
129	+
130	+	textAreaOutput = new JTextArea();
131	+	scrollPaneOutput.setViewportView(textAreaOutput);
132	+
133	+	contentPane.add(labelOutput);
134	+	contentPane.add(scrollPaneOutput);
135	+	scrollPaneOutput.setViewportView(textAreaOutput);
136	+	}
137	+
138	+	private void cipherDecipher(String message, int offset){
139	+	if (!jToggleButton.isSelected()) {
140	+	textAreaOutput.setText(cipher(message, offset));
141	+	}
142	+	else{
143	+	textAreaOutput.setText(cipher(message,26 - (offset % 26)));
144	+	}
145	+	}
146	+
147	+	private String cipher(String message, int offset) {
148	+	StringBuilder result = new StringBuilder();
149	+	for (char character : message.toCharArray()) {
150	+	if (character != ' ') {
151	+	int originalAlphabetPosition = character - 'a';
152	+	int newAlphabetPosition = (originalAlphabetPosition + offset) % 26;
153	+	char newCharacter = (char) ('a' + newAlphabetPosition);
154	+	result.append(newCharacter);
155	+	} else {
156	+	result.append(character);
157	+	}
158	+	}
159	+	return result.toString();
160	+	}
161	+
162	+	public static void main(String[] args){
163	+	Main main = new Main();
164	+	main.setVisible(true);
165	+	}
166	+	}
167	+

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README.md

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35	35		[1] \| TCP chat server \| :heavy_check_mark:
36	36		[2] \| UDP chat server \| :x:
37	37		[3] \| Multi-threaded UDP or TCP chat server \| :x:
38		-	[4] \| Server for file transfers \| :x:
39		-	[5] \| Caesar Cipher tool \| :x:
	38	+	[4] \| Server for file transfers \| :heavy_check_mark:
	39	+	[5] \| Caesar Cipher tool \| :heavy_check_mark:
40	40		[6] \| TCP chat server -> The messages should be encoded with Caesar Cipher \| :x:
41	41		[7] \| ROT13 Cipher \| :x:
42	42		[8] \| UDP Chat server -> The messages should be encoded with ROT13 Cipher \| :x:
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