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tftp_server.py
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tftp_server.py
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"""
Minimum TFTP server & client.
Support only RFC 1350. No ascii mode.
Python3.x.
version 20110917
usage:
----------------------------------------------
>>> import minimumTFTP
## server running
>>> tftpServer = minimumTFTP.Server('.')
>>> tftpServer.run()
## client running
## arg1: server_IP_address
## arg2: client_directory
## arg3: get or put filename
>>> tftpClient = minimumTFTP.Client(arg1, arg2, arg3)
## get
>>> tftpClient.get()
## put
>>> tftpClient.put()
----------------------------------------------
"""
import socket
import struct
import os
import re
import time
import threading
import sys
import requests
import json
import signal
class Server:
def __init__(self, dPath):
global serverDir, serverLocalSocket, remoteDict
serverDir = dPath
serverLocalSocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
serverLocalSocket.bind(('0.0.0.0', 69))
remoteDict = {}
def run(self):
try:
while True:
try:
data, remoteSocket = serverLocalSocket.recvfrom(4096)
if remoteSocket in remoteDict:
remoteDict[remoteSocket].runProc(data)
else:
remoteDict[remoteSocket] = packetProcess(remoteSocket)
remoteDict[remoteSocket].runProc(data)
except:
pass
except KeyboardInterrupt:
print('interrupted!')
pass
class watchdog(threading.Thread):
def __init__(self, owner):
threading.Thread.__init__(self)
self.setDaemon(True)
self.resetEvent = threading.Event()
self.stopEvent = threading.Event()
self.owner = owner
def run(self):
timeCount = 0
while True:
if self.stopEvent.isSet():
break
if timeCount % 5 == 0 and 0 < timeCount < 25:
remoteDict[self.owner].reSend()
print('Resend data.(%s:%s)' %(self.owner[0], self.owner[1]))
elif timeCount >= 25:
remoteDict[self.owner].clear('Session timeout. (%s:%s)' \
%(self.owner[0], self.owner[1]))
break
if self.resetEvent.isSet():
timeCount = 0
self.resetEvent.clear()
time.sleep(1)
timeCount += 1
def countReset(self):
self.resetEvent.set()
def stop(self):
self.stopEvent.set()
class packetProcess:
def __init__(self, remoteSocket):
self.remoteSocket = remoteSocket
self.endFrag = False
self.watchdog = watchdog(self.remoteSocket)
def runProc(self, data):
self.watchdog.countReset()
Opcode = struct.unpack('!H', data[0:2])[0]
##Opcode 1 [ Read request ]
##
## 2 bytes string 1 byte string 1 byte
## -----------------------------------------------
## RRQ | 01 | Filename | 0 | Mode | 0 |
## -----------------------------------------------
if Opcode == 1:
filename = bytes.decode(data[2:].split(b'\x00')[0])
configId = filename
filePath = os.path.join(serverDir, filename)
print('Read request from:%s:%s, filename:%s' \
%(self.remoteSocket[0], self.remoteSocket[1],filename))
r = requests.get('http://192.168.0.42:3000/api/Config/' + configId )
data = json.loads(r.content)['data']
with open(filePath, 'w') as f:
for line in data:
f.write(line + '\n')
print line
print r.content
print filePath
print filename
if os.path.isfile(filePath):
try:
self.sendFile = open(filePath, 'rb')
except:
serverLocalSocket.sendto(errFileopen, self.remoteSocket)
self.clear('Can not read file. Session closed. (%s:%s)' \
%(self.remoteSocket[0], self.remoteSocket[1]))
return None
dataChunk = self.sendFile.read(512)
self.totalDatalen = len(dataChunk)
self.countBlock = 1
self.sendPacket = struct.pack(b'!2H', 3, self.countBlock) \
+ dataChunk
serverLocalSocket.sendto(self.sendPacket, self.remoteSocket)
if len(dataChunk) < 512:
self.endFrag = True
self.watchdog.start()
else:
serverLocalSocket.sendto(errNofile, self.remoteSocket)
self.clear('Requested file not found. Session closed. (%s:%s)' \
%(self.remoteSocket[0], self.remoteSocket[1]))
##Opcode 2 [ Write request ]
##
## 2 bytes string 1 byte string 1 byte
## -----------------------------------------------
## WRQ | 02 | Filename | 0 | Mode | 0 |
## -----------------------------------------------
elif Opcode == 2:
filename = bytes.decode(data[2:].split(b'\x00')[0])
filePath = os.path.join(serverDir, filename)
print('Write request from:%s:%s, filename:%s' \
%(self.remoteSocket[0], self.remoteSocket[1], filename))
if os.path.isfile(filePath):
serverLocalSocket.sendto(errFileExists, self.remoteSocket)
self.clear('File already exist. Session closed. (%s:%s)' \
%(self.remoteSocket[0], self.remoteSocket[1]))
else:
try:
self.rcvFile = open(filePath, 'wb')
except:
serverLocalSocket.sendto(errFileopen, self.remoteSocket)
self.clear('Can not open file. Session closed. (%s:%s)' \
%(self.remoteSocket[0], self.remoteSocket[1]))
return None
self.totalDatalen = 0
self.countBlock = 1
self.sendPacket = struct.pack(b'!2H', 4, 0)
serverLocalSocket.sendto(self.sendPacket, self.remoteSocket)
self.watchdog.start()
##Opcode 3 [ Data ]
##
## 2 bytes 2 bytes n bytes
## ---------------------------------
## DATA | 03 | Block # | Data |
## ---------------------------------
elif Opcode == 3:
blockNo = struct.unpack('!H', data[2:4])[0]
dataPayload = data[4:]
self.totalDatalen += len(dataPayload)
if blockNo == self.countBlock:
try:
self.rcvFile.write(dataPayload)
except:
serverLocalSocket.sendto(errFilewrite, self.remoteSocket)
self.clear('Can not write data. Session closed. (%s:%s)' \
%(self.remoteSocket[0], self.remoteSocket[1]))
return None
self.countBlock += 1
if self.countBlock == 65536:
self.countBlock = 0
self.sendPacket = struct.pack(b'!2H', 4, blockNo)
serverLocalSocket.sendto(self.sendPacket, self.remoteSocket)
self.watchdog.countReset()
if len(dataPayload) < 512:
self.clear('Data receive finish. %s bytes (%s:%s)' \
%(self.totalDatalen, self.remoteSocket[0],
self.remoteSocket[1]))
else:
print('Receive wrong block. Resend data. (%s:%s)'
%(self.remoteSocket[0], self.remoteSocket[1]))
##Opcode 4 [ ack ]
##
## 2 bytes 2 bytes
## -------------------
## ACK | 04 | Block # |
## --------------------
elif Opcode == 4:
if self.endFrag:
self.clear('Data send finish. %s bytes (%s:%s)' \
%(self.totalDatalen, self.remoteSocket[0],
self.remoteSocket[1]))
else:
blockNo = struct.unpack('!H',data[2:4])[0]
if blockNo == self.countBlock:
try:
dataChunk = self.sendFile.read(512)
except:
dataChunk = ''
dataLen = len(dataChunk)
self.totalDatalen += dataLen
self.countBlock += 1
if self.countBlock == 65536:
self.countBlock = 0
self.sendPacket = struct.pack(b'!2H', 3, self.countBlock) \
+ dataChunk
serverLocalSocket.sendto(self.sendPacket, self.remoteSocket)
self.watchdog.countReset()
if dataLen < 512:
self.endFrag = True
else:
print('Receive wrong block. Resend data. (%s:%s)'
%(self.remoteSocket[0], self.remoteSocket[1]))
##Opcode 5 [ error ]
##
## 2 bytes 2 bytes string 1 byte
## ----------------------------------------
## ERROR | 05 | ErrorCode | ErrMsg | 0 |
## ----------------------------------------
elif Opcode == 5:
errCode = struct.unpack('!H',data[2:4])[0]
errString = data[4:-1]
self.clear('Received error code %s:%s Session closed.(%s:%s)' \
%(str(errCode), errString, self.remoteSocket[0],
self.remoteSocket[1]))
##
##Unknown Opcode
##
else:
serverLocalSocket.sendto(errUnknown, self.remoteSocket)
self.clear('Unknown error. Session closed.(%s:%s)' \
%(self.remoteSocket[0], self.remoteSocket[1]))
def reSend(self):
serverLocalSocket.sendto(self.sendPacket, self.remoteSocket)
def clear(self, message):
try:
self.sendFile.close()
except:
pass
try:
self.rcvFile.close()
except:
pass
del remoteDict[self.remoteSocket]
self.watchdog.stop()
print(message.strip())
class Client:
def __init__(self, serverIP, clientDir, fileName):
self.serverIP = serverIP
self.filePath = os.path.join(clientDir, fileName)
self.fileName = fileName
self.clientSocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.clientSocket.settimeout(5)
def get(self):
if os.path.isfile(self.filePath):
print(self.fileName + ' is alredy exist. Can not start.')
return None
##Opcode 1 [ Read request ]
##
## 2 bytes string 1 byte string 1 byte
## -----------------------------------------------
## RRQ | 01 | Filename | 0 | Mode | 0 |
## -----------------------------------------------
format = '!H' + str(len(self.fileName)) + 'sB5sB'
self.sendPacket = struct.pack(format.encode(), 1, \
self.fileName.encode(), 0, b'octet', 0)
self.clientSocket.sendto(self.sendPacket, (self.serverIP, 69))
try:
getFile = open(self.filePath, 'wb')
except:
print(self.fileName + ' can not open.')
return None
totalDatalen = 0
countBlock = 1
errCount = 0
while True:
while errCount < 3:
try:
data, remoteSocket = self.clientSocket.recvfrom(4096)
Opcode = struct.unpack('!H', data[0:2])[0]
errCount = 0
break
except:
self.clientSocket.sendto(self.sendPacket, (self.serverIP, 69))
Opcode = 'Timeout'
errCount += 1
##Opcode 3 [ Data ]
##
## 2 bytes 2 bytes n bytes
## ---------------------------------
## DATA | 03 | Block # | Data |
## ---------------------------------
if Opcode == 3:
blockNo = struct.unpack('!H',data[2:4])[0]
if blockNo != countBlock:
self.clientSocket.sendto(errBlockNo, remoteSocket)
print('Receive wrong block. Session closed.')
getFile.close()
break
countBlock += 1
if countBlock == 65536:
countBlock = 1
dataPayload = data[4:]
try:
getFile.write(dataPayload)
except:
self.clientSocket.sendto(errFilewrite, remoteSocket)
print('Can not write data. Session closed.')
getFile.close()
break
totalDatalen += len(dataPayload)
sys.stdout.write('\rget %s :%s bytes.' \
%(self.fileName, totalDatalen))
self.sendPacket = struct.pack(b'!2H', 4, blockNo)
self.clientSocket.sendto(self.sendPacket, remoteSocket)
if len(dataPayload) < 512:
sys.stdout.write('\rget %s :%s bytes. finish.' \
%(self.fileName, totalDatalen))
getFile.close()
break
elif Opcode == 5:
errCode = struct.unpack('!H',data[2:4])[0]
errString = data[4:-1]
print('Received error code %s : %s' \
%(str(errCode), bytes.decode(errString)))
getFile.close()
break
elif Opecode == 'Timeout':
print('Timeout. Session closed.')
try:
getFile.close()
except:
pass
break
else:
print('Unknown error. Session closed.')
try:
getFile.close()
except:
pass
break
def put(self):
if not os.path.isfile(self.filePath):
print(self.fileName + ' not exist. Can not start.')
return None
##Opcode 2 [ Write request ]
##
## 2 bytes string 1 byte string 1 byte
## -----------------------------------------------
## WRQ | 02 | Filename | 0 | Mode | 0 |
## -----------------------------------------------
format = '!H' + str(len(self.fileName)) + 'sB5sB'
WRQpacket = struct.pack(format.encode(), 2, self.fileName.encode(), 0, \
b'octet', 0)
self.clientSocket.sendto(WRQpacket, (self.serverIP, 69))
try:
putFile = open(self.filePath, 'rb')
except:
print(self.fileName + ' can not open.')
return None
endFlag = False
totalDatalen = 0
countBlock = 0
while True:
data, remoteSocket = self.clientSocket.recvfrom(4096)
Opcode = struct.unpack('!H', data[0:2])[0]
##Opcode 4 [ ack ]
##
## 2 bytes 2 bytes
## --------------------
## ACK | 04 | Block # |
## --------------------
if Opcode == 4:
if endFlag == True:
putFile.close()
sys.stdout.write('\rput %s :%s bytes. finish.' \
%(self.fileName, totalDatalen))
break
blockNo = struct.unpack('!H',data[2:4])[0]
if blockNo != countBlock:
self.clientSocket.sendto(errBlockNo, remoteSocket)
print('Receive wrong block. Session closed.')
putFile.close()
break
blockNo += 1
if blockNo == 65536:
blockNo = 0
dataChunk = putFile.read(512)
DATApacket = struct.pack(b'!2H', 3, blockNo) + dataChunk
self.clientSocket.sendto(DATApacket, remoteSocket)
totalDatalen += len(dataChunk)
sys.stdout.write('\rput %s :%s bytes.' \
%(self.fileName, totalDatalen))
countBlock += 1
if countBlock == 65536:
countBlock = 0
if len(dataChunk) < 512:
endFlag = True
elif Opcode == 5:
errCode = struct.unpack('!H',data[2:4])[0]
errString = data[4:-1]
print('Receive error code %s : %s' \
%(str(errCode), bytes.decode(errString)))
putFile.close()
break
else:
self.clear('Unknown error. Session closed.')
try:
putFile.close()
except:
pass
break
"""
Error Codes
Value Meaning
0 Not defined, see error message (if any).
1 File not found.
2 Access violation.
3 Disk full or allocation exceeded.
4 Illegal TFTP operation.
5 Unknown transfer ID.
6 File already exists.
"""
errNofile = struct.pack(b'!2H15sB', 5, 1, b'File not found.', 0)
errFileopen = struct.pack(b'!2H18sB', 5, 2, b'Can not open file.', 0)
errFilewrite = struct.pack(b'!2H19sB', 5, 2, b'Can not write file.', 0)
errBlockNo = struct.pack(b'!2H20sB', 5, 5, b'Unknown transfer ID.', 0)
errFileExists = struct.pack(b'!2H20sB', 5, 6, b'File already exists.', 0)
errUnknown = struct.pack(b'!2H23sB', 5, 4, b'Illegal TFTP operation.', 0)
def test():
'''
server runnning
Usage: python -m minimumTFTP -s [directory]
client get
Usage: python -m minimumTFTP -g [serverIP] [directory] [filename]
client put
Usage: python -m minimumTFTP -p [serverIP] [directory] [filename]
'''
if '-s' in sys.argv:
try:
Server(sys.argv[2]).run()
except:
print(sys.exc_info()[0])
raise
elif '-g' in sys.argv:
try:
Client(sys.argv[2], sys.argv[3], sys.argv[4]).get()
except:
print(sys.exc_info()[0])
raise
elif '-p' in sys.argv:
try:
Client(sys.argv[2], sys.argv[3], sys.argv[4]).put()
except:
print(sys.exc_info()[0])
raise
elif 'help' in sys.argv:
print(test.__doc__)
sys.exit(0)
else:
print(test.__doc__)
sys.exit(0)
if __name__ == '__main__':
test()