几个月前写的,今天改了一下,只有服务器端.
参考:tftp协议规范
TFtpServer.java
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/*
* 创建日期 2004-8-30-11:31:14
*
*/
package starfire.tftp;
import java.net.*;
import java.io.*;
import java.util.*;
/**
* <a href="http://www.longen.org/S-Z/details-z/TFTPProtocol.htm">tftp 协议规范 </a>
*
* @author <a href="mailto:starfire@bit.edu.cn">starfire </a>
*
*/
public class TFtpServer extends Thread {
public static final int DEFAULT_PORT = 69;
private HashMap map = new HashMap();
private File root;
private int port = DEFAULT_PORT;
private DatagramSocket ds;
private Timer timer = new Timer(true);
public TFtpServer() {
this(".");
}
public TFtpServer(String rootPath, int port) {
this(rootPath);
this.port = port;
}
public TFtpServer(String rootPath) {
this.root = new File(rootPath);
try {
this.root = this.root.getCanonicalFile();
} catch (IOException e) {
e.printStackTrace();
}
}
public void run() {
try {
ds = new DatagramSocket(new InetSocketAddress(port));
} catch (SocketException e) {
System.out.println("error when create datagram socket:"
+ e.getMessage());
return;
}
System.out.println("root path:" + root.getPath());
byte[] buf = new byte[516];
DatagramPacket packet = new DatagramPacket(buf, 516);
while (true) {
try {
ds.receive(packet);
System.out.println("recv packet:");
TFtpPacketUtil.displayBytes(packet.getData());//
process(packet);
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
protected void process(DatagramPacket packet) {
try {
byte[] buf = new byte[packet.getLength()];
System.arraycopy(packet.getData(), 0, buf, 0, buf.length);
TFtpPacket tfp = TFtpPacketUtil.decode(buf);
InetSocketAddress address = new InetSocketAddress(packet
.getAddress(), packet.getPort());
String key = address.getHostName() + ":" + address.getPort();
System.out.println("key=" + key);
System.out.println("packet:" + tfp);
if (tfp.getOperateCode() == TFtpPacket.RRQ
|| tfp.getOperateCode() == TFtpPacket.WRQ) {
Client client = new Client(address);
boolean result = client.doAccept((RWPacket) tfp);
if (result) {
map.put(key, client);
}
} else if (tfp.getOperateCode() == TFtpPacket.DATA) {
Client client = (Client) map.get(key);
if (client == null) {
return;
}
boolean result = client.doProcess((DATAPacket) tfp);
if (result) {
map.remove(key);
client.destroy();
}
} else if (tfp.getOperateCode() == TFtpPacket.ACK) {
Client client = (Client) map.get(key);
if (client == null) {
return;
}
boolean result = client.doProcess((ACKPacket) tfp);
if (result) {
map.remove(key);
client.destroy();
}
} else if (tfp.getOperateCode() == TFtpPacket.ERROR) {
System.out.println(tfp);
Client client = (Client) map.remove(key);
client.destroy();
}
} catch (BadPacketFormatException e) {
e.printStackTrace();
System.out.println("recv unknown packet.");
}
}
protected void send(InetSocketAddress address, byte[] data) {
DatagramPacket packet = new DatagramPacket(data, data.length, address
.getAddress(), address.getPort());
try {
ds.send(packet);
System.out.println("send packet:");
TFtpPacketUtil.displayBytes(data);
} catch (IOException e) {
e.printStackTrace();
}
}
class Client {
public static final int DEFAULT_DATA_SIZE = 512;
public static final int DEFAULT_TIME_OUT = 1000;
private InetSocketAddress address;
private String fileName;
private int block;
private boolean checked;//上次发送的包已收到回应
private RandomAccessFile raf;
private boolean accepted = false;
private byte[] buf = new byte[DEFAULT_DATA_SIZE];
private byte[] data;
private int times = 0;//每几次重发
private ResendTask task;
public Client(InetSocketAddress address) {
this.address = address;
}
public void destroy() {
if (task != null) {
task.cancel();
}
if (raf != null) {
try {
raf.close();
} catch (IOException e) {
e.printStackTrace();
}
raf = null;
}
}
/**
* if accept,return true;else return false.
*
* @param packet
* @return
*/
public boolean doAccept(RWPacket packet) {
this.fileName = packet.getFileName();
if (accepted) {
return true;
}
if (packet.getOperateCode() == TFtpPacket.RRQ) {
try {
File file = new File(root, fileName);
System.out.println(file.getPath() + " " + file.exists());
raf = new RandomAccessFile(file, "r");
data = new byte[DEFAULT_DATA_SIZE];
int size = raf.read(data);
DATAPacket dp = new DATAPacket();
dp.setBlock(1);
if (size != DEFAULT_DATA_SIZE) {
byte[] buf = new byte[size];
System.arraycopy(data, 0, buf, 0, size);
data = buf;
}
dp.setData(data);
data = TFtpPacketUtil.encode(dp);
send(address, data);
block = 1;
task = new ResendTask(address, data);
timer.schedule(task, DEFAULT_TIME_OUT);
} catch (FileNotFoundException e) {
System.out
.println("file:" + e.getMessage() + " not found.");
ERRORPacket ep = new ERRORPacket();
ep.setErrorCode(ERRORPacket.FILE_NOT_FOUND_CODE);
byte[] data = TFtpPacketUtil.encode(ep);
send(address, data);
return false;
} catch (IOException e) {
e.printStackTrace();
}
} else {
File file = new File(root, fileName);
if (file.exists()) {
ERRORPacket ep = new ERRORPacket();
ep.setErrorCode(ERRORPacket.FILE_EXIST_CODE);
ep.setErrorMessage("file:" + fileName + " has exist");
byte[] data = TFtpPacketUtil.encode(ep);
send(address, data);
return false;
}
try {
file.createNewFile();
raf = new RandomAccessFile(file, "rwd");
} catch (IOException e) {
System.out.println("create file:" + fileName + " failed.");
ERRORPacket ep = new ERRORPacket();
ep.setErrorCode(ERRORPacket.NOT_DEFINED_CODE);
byte[] data = TFtpPacketUtil.encode(ep);
send(address, data);
return false;
}
ACKPacket ap = new ACKPacket();
ap.setBlock(0);
data = TFtpPacketUtil.encode(ap);
send(address, data);
task = new ResendTask(address, data);
timer.schedule(task, DEFAULT_TIME_OUT);
}
accepted = true;
return accepted;
}
/**
* if transfer end,return true,else return false.
*
* @param packet
* @return
*/
public boolean doProcess(ACKPacket packet) {
if (task != null) {
task.cancel();
task = null;
}
if (packet.getBlock() == block) {
try {
if (raf == null
|| raf.length() <= block * DEFAULT_DATA_SIZE) {
return true;
}
raf.seek(block * DEFAULT_DATA_SIZE);
int size = raf.read(buf);
data = buf;
if (size < DEFAULT_DATA_SIZE) {
data = new byte[size];
System.arraycopy(buf, 0, data, 0, size);
raf.close();
raf = null;
}
DATAPacket dp = new DATAPacket();
block++;
dp.setBlock(block);
dp.setData(data);
data = TFtpPacketUtil.encode(dp);
send(address, data);
TFtpPacketUtil.displayBytes(data);
task = new ResendTask(address, data);
timer.schedule(task, DEFAULT_TIME_OUT);
} catch (IOException e) {
e.printStackTrace();
}
}
return false;
}
/**
* if transfer end,return true,else return false.
*
* @param packet
* @return
*/
public boolean doProcess(DATAPacket packet) {
if (task != null) {
task.cancel();
task = null;
}
byte[] data = packet.getData();
if (packet.getBlock() != block + 1) {
return false;
}
block++;
ACKPacket ap = new ACKPacket();
ap.setBlock(block);
if (data != null) {
try {
raf.write(data);
} catch (IOException e) {
e.printStackTrace();
}
}
if (data == null || data.length < DEFAULT_DATA_SIZE) {
try {
raf.close();
raf = null;
} catch (IOException e) {
e.printStackTrace();
}
}
data = TFtpPacketUtil.encode(ap);
send(address, data);
task = new ResendTask(address, data);
timer.schedule(task, DEFAULT_TIME_OUT);
return packet.getData() == null
|| packet.getData().length < DEFAULT_DATA_SIZE;
}
}
class ResendTask extends java.util.TimerTask {
private InetSocketAddress address;
private byte[] data;
private int times = 1;
public ResendTask(InetSocketAddress address, byte[] data) {
this.address = address;
this.data = data;
}
public ResendTask(InetSocketAddress address, byte[] data,int times) {
this.address = address;
this.data = data;
this.times = times;
}
public void run() {
send(address, data);
if (times < 3) {//最多发3次
timer.schedule(new ResendTask(address,data,times+1), (int) (Math.pow(2, times+1))
* Client.DEFAULT_TIME_OUT);
}
}
public byte[] getData() {
return data;
}
}
public static void main(String[] args) {
new TFtpServer("e:\\").start();
}
/**
* @return
*/
public File getRoot() {
return root;
}
/**
* @return
*/
public int getPort() {
return port;
}
/**
* @param i
*/
public void setPort(int i) {
port = i;
}
}
TFtpPacketUtil.java
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/*
* 创建日期 2004-8-30-12:49:20
*
*/
package starfire.tftp;
/**
* @author <a href="mailto:starfire@bit.edu.cn">starfire</a>
*
*/
public final class TFtpPacketUtil {
private TFtpPacketUtil() {
}
public static TFtpPacket decode(byte[] buf) throws BadPacketFormatException {
if (buf==null || buf.length<4) {
throw new BadPacketFormatException("packet too small");
}
int operateCode = buf[1];
if (operateCode<TFtpPacket.RRQ || operateCode>TFtpPacket.ERROR) {
throw new BadPacketFormatException("unknown operate code");
}
switch (operateCode) {
case TFtpPacket.RRQ:
case TFtpPacket.WRQ:
return decodeRWPacket(buf);
case TFtpPacket.DATA:
return decodeDATAPacket(buf);
case TFtpPacket.ACK:
return decodeACKPacket(buf);
case TFtpPacket.ERROR:
return decodeERRORPacket(buf);
}
return null;
}
/**
* 2 bytes 2 bytes string 1 byte
* -----------------------------------------
* | Opcode | ErrorCode | ErrMsg | 0 |
* -----------------------------------------
*/
private static TFtpPacket decodeERRORPacket(byte[] buf) throws BadPacketFormatException {
if (buf.length<4) {
throw new BadPacketFormatException("ack packet must >= 4 bytes");
}
ERRORPacket packet = new ERRORPacket();
packet.setOperateCode(TFtpPacket.ERROR);
packet.setErrorCode(buf[2]<<8+buf[3]);
int end = 4;
int i = 4;
for (;i<buf.length;i++) {
if (buf[i]==0) {
end = i;
break;
}
}
if (i!=buf.length) {
String str = new String(buf,4,end-4);
packet.setErrorMessage(str);
}
return packet;
}
/**
* 2 bytes 2 bytes
* ---------------------
* | Opcode | Block # |
* ---------------------
* @param buf
* @return
*/
private static TFtpPacket decodeACKPacket(byte[] buf) throws BadPacketFormatException {
displayBytes(buf);
if (buf.length<4) {
throw new BadPacketFormatException("ack packet must be 4 bytes");
}
ACKPacket packet = new ACKPacket();
packet.setOperateCode(TFtpPacket.ACK);
//System.out.println("buf[2]="+buf[2]+" buf[3]="+buf[3]+" total="+(buf[2]*256+buf[3]));
packet.setBlock(byte2int(buf[2])*256+byte2int(buf[3]));
//System.out.println("block:"+packet.getBlock());
return packet;
}
/**
* 2 bytes 2 bytes n bytes
* ----------------------------------
* | Opcode | Block # | Data |
* ----------------------------------
* @param buf
* @return
*/
private static TFtpPacket decodeDATAPacket(byte[] buf) throws BadPacketFormatException {
if (buf.length<4) {
throw new BadPacketFormatException("bad data packet");
}
DATAPacket packet = new DATAPacket();
packet.setOperateCode(TFtpPacket.DATA);
packet.setBlock(byte2int(buf[2])*256+byte2int(buf[3]));
//System.out.println("decode data packet,block:"+packet.getBlock());
byte[] data = new byte[buf.length-4];
System.arraycopy(buf,4,data,0,data.length);
packet.setData(data);
return packet;
}
private static int byte2int(byte b) {
if ((b&0x80)!=0) {
return 128+(b&0x7f);
}
else {
return b;
}
}
/**
* RRQ,WRQ packet format
* 2 bytes string 1 byte string 1 byte
* ------------------------------------------------
* | Opcode | Filename | 0 | Mode | 0 |
* ------------------------------------------------
* @param buf
* @return
*/
private static TFtpPacket decodeRWPacket(byte[] buf) throws BadPacketFormatException {
RWPacket packet = new RWPacket();
packet.setOperateCode((int)buf[1]);
int start = 2;
int end = 2;
int i;
for (i=start;i<buf.length;i++) {
if (buf[i]==0) {
end = i;
break;
}
}
if (i==buf.length) {
throw new BadPacketFormatException();
}
packet.setFileName(new String(buf,start,end-start));
start = end+1;
end = start;
for (i=start;i<buf.length;i++) {
if (buf[i]==0) {
end = i;
break;
}
}
if (i==buf.length) {
throw new BadPacketFormatException();
}
packet.setMode(new String(buf,start,end-start));
return packet;
}
public static byte[] encode(TFtpPacket packet) {
int operateCode = packet.getOperateCode();
switch (operateCode) {
case TFtpPacket.RRQ:
case TFtpPacket.WRQ:
return encodeRWPacket((RWPacket)packet);
case TFtpPacket.DATA:
return encodeDATAPacket((DATAPacket)packet);
case TFtpPacket.ACK:
return encodeACKPacket((ACKPacket)packet);
case TFtpPacket.ERROR:
return encodeERRORPacket((ERRORPacket)packet);
}
return null;
}
/**
* @param packet
* @return
*/
private static byte[] encodeERRORPacket(ERRORPacket packet) {
byte[] messageBytes = null;
if (packet.getErrorMessage()!=null) {
messageBytes = packet.getErrorMessage().getBytes();
}
int size = messageBytes==null?0:messageBytes.length;
size += 2+2+1;
byte[] buf = new byte[size];
buf[1] = (byte)(TFtpPacket.ERROR&0xff);
int errorCode = packet.getErrorCode();
buf[2] = (byte)((errorCode>>8)&0xff);
buf[3] = (byte)(errorCode&0xff);
if (messageBytes!=null) {
System.arraycopy(messageBytes,0,buf,4,messageBytes.length);
}
return buf;
}
/**
* @param packet
* @return
*/
private static byte[] encodeACKPacket(ACKPacket packet) {
byte[] buf = new byte[4];
buf[1] = (byte)(TFtpPacket.ACK&0xff);
int block = packet.getBlock();
buf[2] = (byte)((block>>8)&0xff);
buf[3] = (byte)(block&0xff);
return buf;
}
/**
* @param packet
* @return
*/
private static byte[] encodeDATAPacket(DATAPacket packet) {
byte[] data = packet.getData();
int size = 2+2;
if (data!=null) {
size += data.length;
}
byte[] buf = new byte[size];
System.out.println("encode data packet,buf[0]="+Integer.toHexString(buf[0]));
buf[1] = (byte)(TFtpPacket.DATA&0xff);
int block = packet.getBlock();
buf[2] = (byte)((block>>8)&0xff);
buf[3] = (byte)(block&0xff);
if (data!=null) {
System.arraycopy(data,0,buf,4,data.length);
}
return buf;
}
/**
* @param packet
* @return
*/
private static byte[] encodeRWPacket(RWPacket packet) {
int operateCode = packet.getOperateCode();
int size = 2;
String fileName = packet.getFileName();
String mode = packet.getMode();
byte[] nameBytes = fileName.getBytes();//fileName must not null
size += nameBytes.length+1;
byte[] modeBytes = null;
if (mode!=null) {
modeBytes = mode.getBytes();
size += modeBytes.length+1;
}
byte[] buf = new byte[size];
buf[1] = (byte)(operateCode&0xff);
System.arraycopy(nameBytes,0,buf,2,nameBytes.length);
if (modeBytes!=null) {
int pos = 2+nameBytes.length+1;
System.arraycopy(modeBytes,0,buf,pos,modeBytes.length);
}
return buf;
}
static int count = 0;
public static void displayBytes(byte[] buf) {
count++;
if (buf==null) {
System.out.println(count+":"+"null");
return ;
}
StringBuffer sb = new StringBuffer();
int len = buf.length>10?10:buf.length;
for (int i=0;i<len;i++) {
sb.append(Integer.toHexString(buf[i]));
}
System.out.println(count+":"+sb.toString());
}
}
TFtpPacket.java
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/*
* 创建日期 2004-8-30-11:34:03
*
*/
package starfire.tftp;
/**
* @author <a href="mailto:starfire@bit.edu.cn">starfire</a>
*
*/
public abstract class TFtpPacket {
public static final int UNKNOWN = 0; //unknown
public static final int RRQ = 1; //read request
public static final int WRQ = 2; //write request
public static final int DATA = 3; //data
public static final int ACK = 4; //Acknowledgment
public static final int ERROR = 5; //error
private int operateCode = UNKNOWN;
public int getOperateCode() {
return operateCode;
}
/**
* @param i
*/
public void setOperateCode(int i) {
operateCode = i;
}
}
BadPacketFormatException.java
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/*
* 创建日期 2004-8-30-11:54:24
*
*/
package starfire.tftp;
/**
* @author <a href="mailto:starfire@bit.edu.cn">starfire</a>
*
*/
public class BadPacketFormatException extends Exception {
public BadPacketFormatException() {
super();
}
public BadPacketFormatException(String msg) {
super(msg);
}
}
RWPacket.java
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/*
* 创建日期 2004-8-30-11:51:16
*
*/
package starfire.tftp;
/**
* @author <a href="mailto:starfire@bit.edu.cn">starfire</a>
*
*/
public class RWPacket extends TFtpPacket {
private String fileName;
private String mode;
public RWPacket() {
}
/**
* @return
*/
public String getFileName() {
return fileName;
}
/**
* @return
*/
public String getMode() {
return mode;
}
/**
* @param string
*/
public void setFileName(String string) {
fileName = string;
}
/**
* @param string
*/
public void setMode(String string) {
mode = string;
}
public String toString() {
return (getOperateCode()==TFtpPacket.RRQ?"read packet:":"write packet:")+"[fileName:="+
fileName+"][mode="+mode+"]";
}
}
ERRORPacket.java
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/*
* 创建日期 2004-8-30-13:07:55
*
*/
package starfire.tftp;
/**
* @author <a href="mailto:starfire@bit.edu.cn">starfire</a>
*
*/
public class ERRORPacket extends TFtpPacket {
/**
* 错误码
* Value Meaning
* 0 未定义，请参阅错误信息（如果提示这种信息的话）
* 1 文件未找到
* 2 访问非法
* 3 磁盘满或超过分配的配额
* 4 非法的TFTP操作
* 5 未知的传输ID
* 6 文件已经存在
* 7 没有类似的用户
*/
public static final int NOT_DEFINED_CODE = 0;
public static final int FILE_NOT_FOUND_CODE = 1;
public static final int ILLEGAL_ACCESS_CODE = 2;
public static final int DISK_FULL_CODE = 3;
public static final int ILLEGAL_OPERATE_CODE = 4;
public static final int UNKNOWN_ID_CODE = 5;
public static final int FILE_EXIST_CODE = 6;
public static final int USER_NOT_EXIST_CODE = 7;
private int errorCode;
private String errorMessage;
public ERRORPacket() {
setOperateCode(TFtpPacket.ERROR);
}
/**
* @return
*/
public int getErrorCode() {
return errorCode;
}
/**
* @return
*/
public String getErrorMessage() {
return errorMessage;
}
/**
* @param i
*/
public void setErrorCode(int i) {
errorCode = i;
}
/**
* @param string
*/
public void setErrorMessage(String string) {
errorMessage = string;
}
public String toString() {
return "Error packet:[errorCode="+errorCode+"][errorMessage="+errorMessage+"]";
}
}
DATAPacket.java
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/*
* 创建日期 2004-8-30-13:04:07
*
*/
package starfire.tftp;
/**
* @author <a href="mailto:starfire@bit.edu.cn">starfire</a>
*
*/
public class DATAPacket extends TFtpPacket {
private int block;
private byte[] data;
public DATAPacket() {
setOperateCode(TFtpPacket.DATA);
}
/**
* @return
*/
public int getBlock() {
return block;
}
/**
* @return
*/
public byte[] getData() {
return data;
}
/**
* @param block
*/
public void setBlock(int block) {
this.block = block;
}
/**
* @param data
*/
public void setData(byte[] data) {
this.data = data;
}
public String toString() {
return "Data packet:[block="+block+"][data size="+(data==null?0:data.length)+"]";
}
}
ACKPacket.java
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/*
* 创建日期 2004-8-30-13:05:47
*
*/
package starfire.tftp;
/**
* @author <a href="mailto:starfire@bit.edu.cn">starfire</a>
*
*/
public class ACKPacket extends TFtpPacket {
private int block;
public ACKPacket() {
setOperateCode(TFtpPacket.ACK);
}
/**
* @return
*/
public int getBlock() {
return block;
}
/**
* @param i
*/
public void setBlock(int i) {
block = i;
}
public String toString() {
return "Ack packet:[block="+block+"]";
}
}
