RedGuy/TFTPServer
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Ilya 2020-09-05 17:29:54 +03:00
commit 8dac1ac001
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3
.gitignore vendored Normal file
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.gradle
.idea
build/

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build.gradle Normal file
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plugins {
id 'java'
}
group 'ru.redguy'
version '1.0'
repositories {
mavenCentral()
}
dependencies {
}

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gradle/wrapper/gradle-wrapper.jar vendored Normal file
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gradle/wrapper/gradle-wrapper.properties vendored Normal file
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distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-bin.zip
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists

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gradlew vendored Normal file
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#!/usr/bin/env sh
#
# Copyright 2015 the original author or authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
##############################################################################
##
## Gradle start up script for UN*X
##
##############################################################################
# Attempt to set APP_HOME
# Resolve links: $0 may be a link
PRG="$0"
# Need this for relative symlinks.
while [ -h "$PRG" ] ; do
ls=`ls -ld "$PRG"`
link=`expr "$ls" : '.*-> \(.*\)$'`
if expr "$link" : '/.*' > /dev/null; then
PRG="$link"
else
PRG=`dirname "$PRG"`"/$link"
fi
done
SAVED="`pwd`"
cd "`dirname \"$PRG\"`/" >/dev/null
APP_HOME="`pwd -P`"
cd "$SAVED" >/dev/null
APP_NAME="Gradle"
APP_BASE_NAME=`basename "$0"`
# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD="maximum"
warn () {
echo "$*"
}
die () {
echo
echo "$*"
echo
exit 1
}
# OS specific support (must be 'true' or 'false').
cygwin=false
msys=false
darwin=false
nonstop=false
case "`uname`" in
CYGWIN* )
cygwin=true
;;
Darwin* )
darwin=true
;;
MINGW* )
msys=true
;;
NONSTOP* )
nonstop=true
;;
esac
CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
# Determine the Java command to use to start the JVM.
if [ -n "$JAVA_HOME" ] ; then
if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
# IBM's JDK on AIX uses strange locations for the executables
JAVACMD="$JAVA_HOME/jre/sh/java"
else
JAVACMD="$JAVA_HOME/bin/java"
fi
if [ ! -x "$JAVACMD" ] ; then
die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
else
JAVACMD="java"
which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
# Increase the maximum file descriptors if we can.
if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
MAX_FD_LIMIT=`ulimit -H -n`
if [ $? -eq 0 ] ; then
if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
MAX_FD="$MAX_FD_LIMIT"
fi
ulimit -n $MAX_FD
if [ $? -ne 0 ] ; then
warn "Could not set maximum file descriptor limit: $MAX_FD"
fi
else
warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
fi
fi
# For Darwin, add options to specify how the application appears in the dock
if $darwin; then
GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
fi
# For Cygwin or MSYS, switch paths to Windows format before running java
if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
APP_HOME=`cygpath --path --mixed "$APP_HOME"`
CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
JAVACMD=`cygpath --unix "$JAVACMD"`
# We build the pattern for arguments to be converted via cygpath
ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
SEP=""
for dir in $ROOTDIRSRAW ; do
ROOTDIRS="$ROOTDIRS$SEP$dir"
SEP="|"
done
OURCYGPATTERN="(^($ROOTDIRS))"
# Add a user-defined pattern to the cygpath arguments
if [ "$GRADLE_CYGPATTERN" != "" ] ; then
OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
fi
# Now convert the arguments - kludge to limit ourselves to /bin/sh
i=0
for arg in "$@" ; do
CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option
if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition
eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
else
eval `echo args$i`="\"$arg\""
fi
i=`expr $i + 1`
done
case $i in
0) set -- ;;
1) set -- "$args0" ;;
2) set -- "$args0" "$args1" ;;
3) set -- "$args0" "$args1" "$args2" ;;
4) set -- "$args0" "$args1" "$args2" "$args3" ;;
5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
esac
fi
# Escape application args
save () {
for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
echo " "
}
APP_ARGS=`save "$@"`
# Collect all arguments for the java command, following the shell quoting and substitution rules
eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
exec "$JAVACMD" "$@"

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@rem
@rem Copyright 2015 the original author or authors.
@rem
@rem Licensed under the Apache License, Version 2.0 (the "License");
@rem you may not use this file except in compliance with the License.
@rem You may obtain a copy of the License at
@rem
@rem https://www.apache.org/licenses/LICENSE-2.0
@rem
@rem Unless required by applicable law or agreed to in writing, software
@rem distributed under the License is distributed on an "AS IS" BASIS,
@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@rem See the License for the specific language governing permissions and
@rem limitations under the License.
@rem
@if "%DEBUG%" == "" @echo off
@rem ##########################################################################
@rem
@rem Gradle startup script for Windows
@rem
@rem ##########################################################################
@rem Set local scope for the variables with windows NT shell
if "%OS%"=="Windows_NT" setlocal
set DIRNAME=%~dp0
if "%DIRNAME%" == "" set DIRNAME=.
set APP_BASE_NAME=%~n0
set APP_HOME=%DIRNAME%
@rem Resolve any "." and ".." in APP_HOME to make it shorter.
for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
@rem Find java.exe
if defined JAVA_HOME goto findJavaFromJavaHome
set JAVA_EXE=java.exe
%JAVA_EXE% -version >NUL 2>&1
if "%ERRORLEVEL%" == "0" goto init
echo.
echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
goto fail
:findJavaFromJavaHome
set JAVA_HOME=%JAVA_HOME:"=%
set JAVA_EXE=%JAVA_HOME%/bin/java.exe
if exist "%JAVA_EXE%" goto init
echo.
echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
goto fail
:init
@rem Get command-line arguments, handling Windows variants
if not "%OS%" == "Windows_NT" goto win9xME_args
:win9xME_args
@rem Slurp the command line arguments.
set CMD_LINE_ARGS=
set _SKIP=2
:win9xME_args_slurp
if "x%~1" == "x" goto execute
set CMD_LINE_ARGS=%*
:execute
@rem Setup the command line
set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
@rem Execute Gradle
"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
:end
@rem End local scope for the variables with windows NT shell
if "%ERRORLEVEL%"=="0" goto mainEnd
:fail
rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
rem the _cmd.exe /c_ return code!
if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
exit /b 1
:mainEnd
if "%OS%"=="Windows_NT" endlocal
:omega

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settings.gradle Normal file
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rootProject.name = 'TFTPServer'

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src/main/java/ru/redguy/tftpserver/CheckSum.java Normal file
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package ru.redguy.tftpserver;
import java.io.FileInputStream;
import java.security.MessageDigest;
public class CheckSum {
static String getChecksum(String fileName) {
StringBuffer sb = new StringBuffer("");
try {
String datafile = fileName;
//use SHA1 to calculate checksum
MessageDigest md = MessageDigest.getInstance("SHA1");
FileInputStream fis = new FileInputStream(datafile);
byte[] dataBytes = new byte[1024];
int nread = 0;
while ((nread = fis.read(dataBytes)) != -1) {
md.update(dataBytes, 0, nread);
}
fis.close();
byte[] mdbytes = md.digest();
// convert the byte to hex format
for (int i = 0; i < mdbytes.length; i++) {
sb.append(Integer.toString((mdbytes[i] & 0xff) + 0x100, 16).substring(1));
}
} catch (Exception e){System.out.println("Generate Checksum Failed: "+e.getMessage());}
return sb.toString();
}
}

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src/main/java/ru/redguy/tftpserver/ErrorEvent.java Normal file
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package ru.redguy.tftpserver;
public interface ErrorEvent {
public void onPacketReceiveException(Exception exception);
public void onPacketReadException(Exception exception);
public void onPacketWriteException(Exception exception);
public void onClientReadException(Exception exception, TFTPread tftPread);
public void onClientWriteException(Exception exception, TFTPwrite tftPwrite);
}

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src/main/java/ru/redguy/tftpserver/TFTPServer.java Normal file
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package ru.redguy.tftpserver;
import java.net.*;
import java.io.*;
public class TFTPServer {
private DatagramSocket socket;
private Runner runner;
private Thread thread;
private ErrorEvent errorEvent;
public void start() throws SocketException {
start(69);
}
public void start(int port) throws SocketException {
socket = new DatagramSocket(port);
runner = new Runner(socket,this);
thread = new Thread(runner);
thread.setDaemon(true);
thread.start();
}
public void start(String host, int port) throws UnknownHostException, SocketException {
socket = new DatagramSocket(port,InetAddress.getByName(host));
runner = new Runner(socket,this);
thread.setDaemon(true);
thread.start();
}
public int getPort() {
return socket.getLocalPort();
}
public void stop() {
thread.interrupt();
}
public void onError(ErrorEvent event) {
this.errorEvent = event;
}
static class Runner implements Runnable {
DatagramSocket datagramSocket;
TFTPServer server;
boolean run = true;
public Runner(DatagramSocket socket,TFTPServer server) {
this.datagramSocket = socket;
this.server = server;
}
public void stop() {
run = false;
}
@Override
public void run() {
while (run) {
TFTPpacket in = null;
try {
in = TFTPpacket.receive(datagramSocket);
} catch (IOException e) {
server.errorEvent.onPacketReceiveException(e);
}
if (in instanceof TFTPread) {
try {
TFTPserverRRQ r = new TFTPserverRRQ((TFTPread) in, server.errorEvent);
} catch (TftpException e) {
server.errorEvent.onPacketReadException(e);
}
}
else if (in instanceof TFTPwrite) {
try {
TFTPserverWRQ w = new TFTPserverWRQ((TFTPwrite) in, server.errorEvent);
} catch (TftpException e) {
server.errorEvent.onPacketWriteException(e);
}
}
}
}
}
}

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src/main/java/ru/redguy/tftpserver/TFTPpacket.java Normal file
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package ru.redguy.tftpserver;
import java.net.*;
import java.io.*;
class TftpException extends Exception {
public TftpException() {
super();
}
public TftpException(String s) {
super(s);
}
}
//////////////////////////////////////////////////////////////////////////////
//GENERAL packet: define the packet structure, necessary members and methods//
//of TFTP packet. To be extended by other specific packet(read, write, etc) //
//////////////////////////////////////////////////////////////////////////////
public class TFTPpacket {
// TFTP constants
public static int tftpPort = 69;
public static int maxTftpPakLen=516;
public static int maxTftpData=512;
// Tftp opcodes
protected static final short tftpRRQ=1;
protected static final short tftpWRQ=2;
protected static final short tftpDATA=3;
protected static final short tftpACK=4;
protected static final short tftpERROR=5;
// Packet Offsets
protected static final int opOffset=0;
protected static final int fileOffset=2;
protected static final int blkOffset=2;
protected static final int dataOffset=4;
protected static final int numOffset=2;
protected static final int msgOffset=4;
// The actual packet for UDP transfer
protected byte [] message;
protected int length;
// Address info (required for replies)
protected InetAddress host;
protected int port;
// Constructor
public TFTPpacket() {
message=new byte[maxTftpPakLen];
length=maxTftpPakLen;
}
// Methods to receive packet and convert it to yhe right type(data/ack/read/...)
public static TFTPpacket receive(DatagramSocket sock) throws IOException {
TFTPpacket in=new TFTPpacket(), retPak=new TFTPpacket();
//receive data and put them into in.message
DatagramPacket inPak = new DatagramPacket(in.message,in.length);
sock.receive(inPak);
//Check the opcode in message, then cast the message into the corresponding type
switch (in.get(0)) {
case tftpRRQ:
retPak=new TFTPread();
break;
case tftpWRQ:
retPak=new TFTPwrite();
break;
case tftpDATA:
retPak=new TFTPdata();
break;
case tftpACK:
retPak=new TFTPack();
break;
case tftpERROR:
retPak=new TFTPerror();
break;
}
retPak.message=in.message;
retPak.length=inPak.getLength();
retPak.host=inPak.getAddress();
retPak.port=inPak.getPort();
return retPak;
}
//Method to send packet
public void send(InetAddress ip, int port, DatagramSocket s) throws IOException {
s.send(new DatagramPacket(message,length,ip,port));
}
// DatagramPacket like methods
public InetAddress getAddress() {
return host;
}
public int getPort() {
return port;
}
public int getLength() {
return length;
}
// Methods to put opcode, blkNum, error code into the byte array 'message'.
protected void put(int at, short value) {
message[at++] = (byte)(value >>> 8); // first byte
message[at] = (byte)(value % 256); // last byte
}
@SuppressWarnings("deprecation")
//Put the filename and mode into the 'message' at 'at' follow by byte "del"
protected void put(int at, String value, byte del) {
value.getBytes(0, value.length(), message, at);
message[at + value.length()] = del;
}
protected int get(int at) {
return (message[at] & 0xff) << 8 | message[at+1] & 0xff;
}
protected String get (int at, byte del) {
StringBuffer result = new StringBuffer();
while (message[at] != del) result.append((char)message[at++]);
return result.toString();
}
}
////////////////////////////////////////////////////////
//DATA packet: put the right code in the message; read//
//file for sending; write file after receiving //
////////////////////////////////////////////////////////
final class TFTPdata extends TFTPpacket {
// Constructors
protected TFTPdata() {}
public TFTPdata(int blockNumber, FileInputStream in) throws IOException {
this.message = new byte[maxTftpPakLen];
// manipulate message
this.put(opOffset, tftpDATA);
this.put(blkOffset, (short) blockNumber);
// read the file into packet and calculate the entire length
length = in.read(message, dataOffset, maxTftpData) + 4;
}
// Accessors
public int blockNumber() {
return this.get(blkOffset);
}
/*
* public void data(byte[] buffer) { buffer = new byte[length-4];
*
* for (int i=0; i<length-4; i++) buffer[i]=message[i+dataOffset]; }
*/
// File output
public int write(FileOutputStream out) throws IOException {
out.write(message, dataOffset, length - 4);
return (length - 4);
}
}
/////////////////////////////////////////////////////////
//ERROR packet: put the right codes and error messages //
//in the 'message' //
/////////////////////////////////////////////////////////
class TFTPerror extends TFTPpacket {
// Constructors
protected TFTPerror() {
}
//Generate error packet
public TFTPerror(int number, String message) {
length = 4 + message.length() + 1;
this.message = new byte[length];
put(opOffset, tftpERROR);
put(numOffset, (short) number);
put(msgOffset, message, (byte) 0);
}
// Accessors
public int number() {
return this.get(numOffset);
}
public String message() {
return this.get(msgOffset, (byte) 0);
}
}
/////////////////////////////////////////////////////////
//ACK packet: put the right opcode and block number in //
//the 'message' //
/////////////////////////////////////////////////////////
final class TFTPack extends TFTPpacket {
// Constructors
protected TFTPack() {
}
//Generate ack packet
public TFTPack(int blockNumber) {
length = 4;
this.message = new byte[length];
put(opOffset, tftpACK);
put(blkOffset, (short) blockNumber);
}
// Accessors
public int blockNumber() {
return this.get(blkOffset);
}
}

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src/main/java/ru/redguy/tftpserver/TFTPread.java Normal file
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package ru.redguy.tftpserver;
/////////////////////////////////////////////////////////
//READ packet: put the right opcode and filename, mode //
//in the 'message' //
/////////////////////////////////////////////////////////
public final class TFTPread extends TFTPpacket {
// Constructors
protected TFTPread() {
}
//specify the filename and transfer mode
public TFTPread(String filename, String dataMode) {
length = 2 + filename.length() + 1 + dataMode.length() + 1;
message = new byte[length];
put(opOffset, tftpRRQ);
put(fileOffset, filename, (byte) 0);
put(fileOffset + filename.length() + 1, dataMode, (byte) 0);
}
// Accessors
public String fileName() {
return this.get(fileOffset, (byte) 0);
}
public String requestType() {
String fname = fileName();
return this.get(fileOffset + fname.length() + 1, (byte) 0);
}
}

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src/main/java/ru/redguy/tftpserver/TFTPserverRRQ.java Normal file
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package ru.redguy.tftpserver;
import java.net.*;
import java.io.*;
class TFTPserverRRQ extends Thread {
protected DatagramSocket sock;
protected InetAddress host;
protected int port;
protected FileInputStream source;
protected TFTPpacket req;
protected int timeoutLimit=5;
protected String fileName;
// initialize read request
public TFTPserverRRQ(TFTPread request, ErrorEvent event) throws TftpException {
try {
req = request;
//open new socket with random port num for tranfer
sock = new DatagramSocket();
sock.setSoTimeout(1000);
fileName = request.fileName();
host = request.getAddress();
port = request.getPort();
//create file object in parent folder
File srcFile = new File(fileName);
/*System.out.println("procce checking");*/
//check file
if (srcFile.exists() && srcFile.isFile() && srcFile.canRead()) {
source = new FileInputStream(srcFile);
this.start(); //open new thread for transfer
} else
throw new TftpException("access violation");
} catch (Exception e) {
TFTPerror ePak = new TFTPerror(1, e.getMessage()); // error code 1
try {
ePak.send(host, port, sock);
} catch (Exception f) {
}
event.onClientReadException(e,request);
}
}
//everything is fine, open new thread to transfer file
public void run() {
int bytesRead = TFTPpacket.maxTftpPakLen;
// handle read request
if (req instanceof TFTPread) {
try {
for (int blkNum = 1; bytesRead == TFTPpacket.maxTftpPakLen; blkNum++) {
TFTPdata outPak = new TFTPdata(blkNum, source);
/*System.out.println("send block no. " + outPak.blockNumber()); */
bytesRead = outPak.getLength();
/*System.out.println("bytes sent: " + bytesRead);*/
outPak.send(host, port, sock);
/*System.out.println("current op code " + outPak.get(0)); */
//wait for the correct ack. if incorrect, retry up to 5 times
while (timeoutLimit!=0) {
try {
TFTPpacket ack = TFTPpacket.receive(sock);
if (!(ack instanceof TFTPack)){throw new Exception("Client failed");}
TFTPack a = (TFTPack) ack;
if(a.blockNumber()!=blkNum){ //check ack
throw new SocketTimeoutException("last packet lost, resend packet");}
/*System.out.println("confirm blk num " + a.blockNumber()+" from "+a.getPort());*/
break;
}
catch (SocketTimeoutException t) {//resend last packet
System.out.println("Resent blk " + blkNum);
timeoutLimit--;
outPak.send(host, port, sock);
}
} // end of while
if(timeoutLimit==0){throw new Exception("connection failed");}
}
System.out.println("Transfer completed.(Client " +host +")" );
System.out.println("Filename: "+fileName + "\nSHA1 checksum: "+CheckSum.getChecksum(fileName)+"\n");
} catch (Exception e) {
TFTPerror ePak = new TFTPerror(1, e.getMessage());
try {
ePak.send(host, port, sock);
} catch (Exception f) {
}
System.out.println("Client failed: " + e.getMessage());
}
}
}
}

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src/main/java/ru/redguy/tftpserver/TFTPserverWRQ.java Normal file
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package ru.redguy.tftpserver;
import java.net.*;
import java.io.*;
class TFTPserverWRQ extends Thread {
protected DatagramSocket sock;
protected InetAddress host;
protected int port;
protected FileOutputStream outFile;
protected TFTPpacket req;
protected int timeoutLimit = 5;
//protected int testloss=0;
protected File saveFile;
protected String fileName;
// Initialize read request
public TFTPserverWRQ(TFTPwrite request, ErrorEvent event) throws TftpException {
try {
req = request;
sock = new DatagramSocket(); // new port for transfer
sock.setSoTimeout(1000);
host = request.getAddress();
port = request.getPort();
fileName = request.fileName();
//create file object in parent folder
saveFile = new File(fileName);
if (!saveFile.exists()) {
outFile = new FileOutputStream(saveFile);
TFTPack a = new TFTPack(0);
a.send(host, port, sock); // send ack 0 at first, ready to
// receive
this.start();
} else
throw new TftpException("access violation, file exists");
} catch (Exception e) {
TFTPerror ePak = new TFTPerror(1, e.getMessage()); // error code 1
try {
ePak.send(host, port, sock);
} catch (Exception f) {
}
event.onClientWriteException(e,request);
}
}
public void run() {
/*int bytesRead = TFTPpacket.maxTftpPakLen;*/
// handle write request
if (req instanceof TFTPwrite) {
try {
for (int blkNum = 1, bytesOut = 512; bytesOut == 512; blkNum++) {
while (timeoutLimit != 0) {
try {
TFTPpacket inPak = TFTPpacket.receive(sock);
//check packet type
if (inPak instanceof TFTPerror) {
TFTPerror p = (TFTPerror) inPak;
throw new TftpException(p.message());
} else if (inPak instanceof TFTPdata) {
TFTPdata p = (TFTPdata) inPak;
/*System.out.println("incoming data " + p.blockNumber());*/
// check blk num
if (/*testloss==20||*/p.blockNumber() != blkNum) { //expect to be the same
//System.out.println("loss. testloss="+testloss+"timeoutLimit="+timeoutLimit);
//testloss++;
throw new SocketTimeoutException();
}
//write to the file and send ack
bytesOut = p.write(outFile);
TFTPack a = new TFTPack(blkNum);
a.send(host, port, sock);
//testloss++;
break;
}
} catch (SocketTimeoutException t2) {
System.out.println("Time out, resend ack");
TFTPack a = new TFTPack(blkNum - 1);
a.send(host, port, sock);
timeoutLimit--;
}
}
if(timeoutLimit==0){throw new Exception("Connection failed");}
}
outFile.close();
System.out.println("Transfer completed.(Client " +host +")" );
System.out.println("Filename: "+fileName + "\nSHA1 checksum: "+CheckSum.getChecksum(fileName)+"\n");
} catch (Exception e) {
TFTPerror ePak = new TFTPerror(1, e.getMessage());
try {
ePak.send(host, port, sock);
} catch (Exception f) {
}
System.out.println("Client failed: " + e.getMessage());
saveFile.delete();
}
}
}
}

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src/main/java/ru/redguy/tftpserver/TFTPwrite.java Normal file
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package ru.redguy.tftpserver;
/////////////////////////////////////////////////////////
//WRITE packet: put the right opcode and filename, mode//
//in the 'message' //
/////////////////////////////////////////////////////////
public final class TFTPwrite extends TFTPpacket {
//Constructors
protected TFTPwrite() {
}
public TFTPwrite(String filename, String dataMode) {
length = 2 + filename.length() + 1 + dataMode.length() + 1;
message = new byte[length];
put(opOffset, tftpWRQ);
put(fileOffset, filename, (byte) 0);
put(fileOffset + filename.length() + 1, dataMode, (byte) 0);
}
//Accessors
public String fileName() {
return this.get(fileOffset, (byte) 0);
}
public String requestType() {
String fname = fileName();
return this.get(fileOffset + fname.length() + 1, (byte) 0);
}
}

47
src/test/java/Main.java Normal file
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import ru.redguy.tftpserver.ErrorEvent;
import ru.redguy.tftpserver.TFTPServer;
import ru.redguy.tftpserver.TFTPread;
import ru.redguy.tftpserver.TFTPwrite;
import java.net.SocketException;
public class Main {
public static void main(String[] args) {
TFTPServer tftpServer = new TFTPServer();
try {
tftpServer.start(1000);
} catch (SocketException e) {
e.printStackTrace();
}
System.out.println(tftpServer.getPort());
tftpServer.onError(new ErrorEvent() {
@Override
public void onPacketReceiveException(Exception exception) {
exception.printStackTrace();
}
@Override
public void onPacketReadException(Exception exception) {
exception.printStackTrace();
}
@Override
public void onPacketWriteException(Exception exception) {
exception.printStackTrace();
}
@Override
public void onClientReadException(Exception exception, TFTPread tftPread) {
exception.printStackTrace();
System.out.println(tftPread.fileName());
}
@Override
public void onClientWriteException(Exception exception, TFTPwrite tftPwrite) {
exception.printStackTrace();
System.out.println(tftPwrite.fileName());
}
});
while (true) {}
}
}