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simple ftp server by python
#!/usr/bin/env python2
# coding: utf-8
import os,socket,threading,time
#import traceback
allow_delete = False
local_ip = socket.gethostbyname(socket.gethostname())
local_port = 8888
currdir=os.path.abspath('.')
class FTPserverThread(threading.Thread):
def __init__(self,(conn,addr)):
self.conn=conn
self.addr=addr
self.basewd=currdir
self.cwd=self.basewd
self.rest=False
self.pasv_mode=False
threading.Thread.__init__(self)
def run(self):
self.conn.send('220 Welcome!\r\n')
while True:
cmd=self.conn.recv(256)
if not cmd: break
else:
print 'Recieved:',cmd
try:
func=getattr(self,cmd[:4].strip().upper())
func(cmd)
except Exception,e:
print 'ERROR:',e
#traceback.print_exc()
self.conn.send('500 Sorry.\r\n')
def SYST(self,cmd):
self.conn.send('215 UNIX Type: L8\r\n')
def OPTS(self,cmd):
if cmd[5:-2].upper()=='UTF8 ON':
self.conn.send('200 OK.\r\n')
else:
self.conn.send('451 Sorry.\r\n')
def USER(self,cmd):
self.conn.send('331 OK.\r\n')
def PASS(self,cmd):
self.conn.send('230 OK.\r\n')
#self.conn.send('530 Incorrect.\r\n')
def QUIT(self,cmd):
self.conn.send('221 Goodbye.\r\n')
def NOOP(self,cmd):
self.conn.send('200 OK.\r\n')
def TYPE(self,cmd):
self.mode=cmd[5]
self.conn.send('200 Binary mode.\r\n')
def CDUP(self,cmd):
if not os.path.samefile(self.cwd,self.basewd):
#learn from stackoverflow
self.cwd=os.path.abspath(os.path.join(self.cwd,'..'))
self.conn.send('200 OK.\r\n')
def PWD(self,cmd):
cwd=os.path.relpath(self.cwd,self.basewd)
if cwd=='.':
cwd='/'
else:
cwd='/'+cwd
self.conn.send('257 \"%s\"\r\n' % cwd)
def CWD(self,cmd):
chwd=cmd[4:-2]
if chwd=='/':
self.cwd=self.basewd
elif chwd[0]=='/':
self.cwd=os.path.join(self.basewd,chwd[1:])
else:
self.cwd=os.path.join(self.cwd,chwd)
self.conn.send('250 OK.\r\n')
def PORT(self,cmd):
if self.pasv_mode:
self.servsock.close()
self.pasv_mode = False
l=cmd[5:].split(',')
self.dataAddr='.'.join(l[:4])
self.dataPort=(int(l[4])<<8)+int(l[5])
self.conn.send('200 Get port.\r\n')
def PASV(self,cmd): # from http://goo.gl/3if2U
self.pasv_mode = True
self.servsock = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
self.servsock.bind((local_ip,0))
self.servsock.listen(1)
ip, port = self.servsock.getsockname()
print 'open', ip, port
self.conn.send('227 Entering Passive Mode (%s,%u,%u).\r\n' %
(','.join(ip.split('.')), port>>8&0xFF, port&0xFF))
def start_datasock(self):
if self.pasv_mode:
self.datasock, addr = self.servsock.accept()
print 'connect:', addr
else:
self.datasock=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
self.datasock.connect((self.dataAddr,self.dataPort))
def stop_datasock(self):
self.datasock.close()
if self.pasv_mode:
self.servsock.close()
def LIST(self,cmd):
self.conn.send('150 Here comes the directory listing.\r\n')
print 'list:', self.cwd
self.start_datasock()
for t in os.listdir(self.cwd):
k=self.toListItem(os.path.join(self.cwd,t))
self.datasock.send(k+'\r\n')
self.stop_datasock()
self.conn.send('226 Directory send OK.\r\n')
def toListItem(self,fn):
st=os.stat(fn)
fullmode='rwxrwxrwx'
mode=''
for i in range(9):
mode+=((st.st_mode>>(8-i))&1) and fullmode[i] or '-'
d=(os.path.isdir(fn)) and 'd' or '-'
ftime=time.strftime(' %b %d %H:%M ', time.gmtime(st.st_mtime))
return d+mode+' 1 user group '+str(st.st_size)+ftime+os.path.basename(fn)
def MKD(self,cmd):
dn=os.path.join(self.cwd,cmd[4:-2])
os.mkdir(dn)
self.conn.send('257 Directory created.\r\n')
def RMD(self,cmd):
dn=os.path.join(self.cwd,cmd[4:-2])
if allow_delete:
os.rmdir(dn)
self.conn.send('250 Directory deleted.\r\n')
else:
self.conn.send('450 Not allowed.\r\n')
def DELE(self,cmd):
fn=os.path.join(self.cwd,cmd[5:-2])
if allow_delete:
os.remove(fn)
self.conn.send('250 File deleted.\r\n')
else:
self.conn.send('450 Not allowed.\r\n')
def RNFR(self,cmd):
self.rnfn=os.path.join(self.cwd,cmd[5:-2])
self.conn.send('350 Ready.\r\n')
def RNTO(self,cmd):
fn=os.path.join(self.cwd,cmd[5:-2])
os.rename(self.rnfn,fn)
self.conn.send('250 File renamed.\r\n')
def REST(self,cmd):
self.pos=int(cmd[5:-2])
self.rest=True
self.conn.send('250 File position reseted.\r\n')
def RETR(self,cmd):
fn=os.path.join(self.cwd,cmd[5:-2])
#fn=os.path.join(self.cwd,cmd[5:-2]).lstrip('/')
print 'Downlowding:',fn
if self.mode=='I':
fi=open(fn,'rb')
else:
fi=open(fn,'r')
self.conn.send('150 Opening data connection.\r\n')
if self.rest:
fi.seek(self.pos)
self.rest=False
data= fi.read(1024)
self.start_datasock()
while data:
self.datasock.send(data)
data=fi.read(1024)
fi.close()
self.stop_datasock()
self.conn.send('226 Transfer complete.\r\n')
def STOR(self,cmd):
fn=os.path.join(self.cwd,cmd[5:-2])
print 'Uplaoding:',fn
if self.mode=='I':
fo=open(fn,'wb')
else:
fo=open(fn,'w')
self.conn.send('150 Opening data connection.\r\n')
self.start_datasock()
while True:
data=self.datasock.recv(1024)
if not data: break
fo.write(data)
fo.close()
self.stop_datasock()
self.conn.send('226 Transfer complete.\r\n')
class FTPserver(threading.Thread):
def __init__(self):
self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.sock.bind((local_ip,local_port))
threading.Thread.__init__(self)
def run(self):
self.sock.listen(5)
while True:
th=FTPserverThread(self.sock.accept())
th.daemon=True
th.start()
def stop(self):
self.sock.close()
if __name__=='__main__':
ftp=FTPserver()
ftp.daemon=True
ftp.start()
print 'On', local_ip, ':', local_port
raw_input('Enter to end...\n')
ftp.stop()
@ZoeS17

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ZoeS17 commented Jun 25, 2016

Is it possible to run this on 3.5.1? I get a syntax error when using IDLE at line 13: def __init__(self,(conn,addr)): it highlights the second ( and for the life of me I don't understand why this grouping/cast system was allowed in 2.7 but not in 3.5.1.

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ZoeS17 commented Jul 2, 2016

line 208, in __init__ self.sock.bind((local_ip,local_port)) OSError: [WinError 10049] The requested address is not valid in its context

Any thoughts?

EDIT: The IP is out of scope for the machine running it. I was hardcoding the wrong IP for testing something. I have forked your Gist and updated it to Python 3.5

@babam86

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babam86 commented Mar 16, 2018

Downloading and uploading does not work when executing the script not on the root folder '/'.

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