#!/usr/bin/python
# -*- coding: utf-8 -*-
"""
Project: Network News Transport Protocol Server Program
Description:
基于数据库的新闻组，实现BBS前端使用NNTP协议来访问贴子
Reference:
NNTP协议： http://www.mibsoftware.com/userkt/0099.htm
正则表达式：
http://wiki.woodpecker.org.cn/moin/RegExpInPython#head-2358765384844ed72f01658cbcde24613d941e9d
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python-chinese
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[EMAIL PROTECTED]
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"""
import sys
import socket
import threading
import time
import asyncore, asynchat
import string, StringIO, re
#from netkiller import *
#import testMessages
from messages import Messages
#print Messages.banner
class nntp_server (asyncore.dispatcher):
channel_counter = 0
def __init__ (self, host, port):
asyncore.dispatcher.__init__ (self)
self.create_socket (socket.AF_INET, socket.SOCK_STREAM)
self.set_reuse_addr()
self.there = (host, port)
self.bind (self.there)
self.listen (5)
def handle_connect(self):
pass
def handle_accept (self):
conn, addr = self.accept()
nntp_receiver (self, (conn, addr))
def handle_error(self):
pass
def handle_close (self):
self.close()
class nntp_receiver (asynchat.async_chat):
def __init__ (self, server, (conn, addr)):
asynchat.async_chat.__init__ (self, conn)
self.set_terminator ('\r\n')
self.server = server
self.server.channel_counter = self.server.channel_counter + 1
self.id = self.server.channel_counter
#self.sender = nntp_sender (self, server.there)
#self.sender.id = self.id
self.buffer = ''
self.handle_connect()
self.current_group = group_selected(None)
def handle_connect (self):
if self.connected :
self.push(Messages.banner)
def collect_incoming_data (self, data):
self.buffer = self.buffer + data
def found_terminator (self):
data = self.buffer
self.buffer = ''
if self.get_terminator() == '\r\n':
parse = self.isCommand(data)
if parse:
parse[0] = parse[0].lower()
self.log('command:'+parse[0])
usenet(self,parse,self.current_group)
if parse[0] == 'post':
self.set_terminator ('.\r\n')
if parse[0] == 'quit':
self.handle_close()
else:
usenet(self,['post',data],self.current_group)
self.set_terminator ('\r\n')
message = '<== (%d) %s' % (self.server.channel_counter,
repr(data))
self.log(message)
#self.log('current:'+self.current_group.get_group())
#self.sender.push (data + '\n')
def close_when_done():
pass
def handle_close (self):
self.log('Closing')
self.server.channel_counter = self.server.channel_counter - 1
#self.sender.close()
self.close()
def isCommand(self,data):
rcommand = (
r'^mode [reader|stream]',
r'^list$',r'^list
[active|active.times|newsgroups|subscriptions]',
r'^xover [0-9]+-[0-9]+',
r'^newgroups [0-9]+ [0-9]+ ',
r'^group .+',
r'^newgroups [0-9]+ [0-9]+ [a-zA-Z]',
r'^head [0-9]+',
r'^body [0-9]+',
r'^article [0-9]+',
r'^post$',r'^next$',r'^last$',
r'^ihave$',r'^slave$',
r'^help$',r'^quit$'
)
parse = []
for command in rcommand:
digs = re.compile(command,re.IGNORECASE)
if digs.match(data):
parse = data.split(' ')
return parse
self.push("500 command not recognized\r\n")
return None
"""
class nntp_sender (asynchat.async_chat):
def __init__ (self, receiver, address):
asynchat.async_chat.__init__ (self)
self.receiver = receiver
self.set_terminator (None)
self.create_socket (socket.AF_INET, socket.SOCK_STREAM)
self.buffer = ''
self.set_terminator ('\n')
self.connect (address)
def handle_connect (self):
print 'Connected'
def collect_incoming_data (self, data):
self.buffer = self.buffer + data
def found_terminator (self):
data = self.buffer
self.buffer = ''
print '==> (%d) %s' % (self.id, repr(data))
self.receiver.push (data + '\n')
def handle_close (self):
self.receiver.close()
self.close()
"""
class group_selected:
#current = None
def __init__(self,value):
self.set_group(value)
def set_group(self,value):
self.current = value
def get_group(self):
return self.current
class usenet:
#threading.Thread
conn = None
addr = None
buffer = None
msg = None
conn = None
current_group = None
HELP = """\
HELP \r\n
100 Legal commands \r\n
authinfo user Name|pass Password \r\n
article [MessageID|Number] \r\n
body [MessageID|Number] \r\n
check MessageID \r\n
date \r\n
group newsgroup \r\n
head [MessageID|Number] \r\n
help \r\n
ihave \r\n
last \r\n
list [active|active.times|newsgroups|subscriptions] \r\n
listgroup newsgroup \r\n
mode stream \r\n
mode reader \r\n
newgroups yymmdd hhmmss [GMT] [<distributions>] \r\n
newnews newsgroups yymmdd hhmmss [GMT] [<distributions>] \r\n
next \r\n
post \r\n
slave \r\n
stat [MessageID|Number] \r\n
takethis MessageID \r\n
xgtitle [group_pattern] \r\n
xhdr header [range|MessageID] \r\n
xover [range] \r\n
xpat header range|MessageID pat [morepat...] \r\n
. \r\n"""
def __init__(self, conn,command,current_group):
self.conn = conn
self.buffer = buffer
self.msg = Messages()
self.current_group = current_group
command[0] = command[0].lower()
self.commands(command)
def welcome(self):
self.conn.send(self.msg.banner)
def commands(self, command):
if not buffer: return True
if command[0] == 'mode':
self.conn.push(self.msg.banner)
elif command[0] == 'list':
lists = self.msg.list()
length = str(len(lists))
self.conn.send("215 list of newsgroups follows\r\n")
for group in lists:
self.conn.push(group+"\r\n")
self.conn.push(".\r\n")
elif command[0] == 'group':
current = command[1]
isNone = self.msg.group(current)
if not isNone:
Responses(self.conn,411)
else:
self.current_group.set_group(current)
number,first,last,group = isNone
self.conn.push("211 " +number+' '+first+' '+last+'
'+group+ " selected\r\n")
elif command[0] == 'newgroups':
#newgroups = self.msg.newgroups(950803,192708,'GMT')
#length = len(newgroups)
self.conn.push("231 list of new newsgroups follows.\r\n")
#for name in newgroups:
# self.conn.push(name+"\r\n")
self.conn.push(".\r\n")
elif command[0] =='article':
MessageID = command[1]
text = self.msg.article(MessageID)
self.conn.push("220 "+MessageID+"
<[EMAIL PROTECTED]> article retrieved - head and body
follows\r\n")
self.conn.push(text)
self.conn.push(".\r\n")
elif command[0] =='head':
MessageID = command[1]
self.conn.push("221 "+MessageID+"
<[EMAIL PROTECTED]>\r\n")
self.conn.push(".\r\n")
elif command[0] =='body':
MessageID = command[0]
self.conn.push("222 "+MessageID+"
<[EMAIL PROTECTED]>\r\n")
self.conn.push(".\r\n")
elif command[0] == 'xover':
if not self.current_group.get_group():
Responses(self.conn,412)
return
xover = command[1]
first, last = xover.split('-')
xovers = self.msg.xover(first,last)
#length = len(xovers)
self.conn.push("224 xover information follows\r\n")
"""
412 no newsgroup has been selected
"""
for xover in xovers:
self.conn.push( xover + "\r\n")
self.conn.push(".\r\n")
elif command[0] =='xhdr':
xhdr = command[1]
subject, range = xhdr.split(' ')
first, last = range.split('-')
self.msg.xhdr('subject',first,last)
#length = len(xover_list)
self.conn.push("221 "+subject+" field follows\r\n")
for xo in xover_list:
self.conn.send( xo + "\r\n")
self.conn.send(".\r\n")
elif command[0] == 'post':
if len(command) == 1:
self.conn.push("340 send article\r\n")
elif len(command) == 2:
data = command[1]
self.msg.post(data)
Responses(self.conn,240)
elif command[0] == 'rset':
self.conn.push("250 OK\r\n")
elif command[0] =='help':
self.conn.push(self.HELP)
elif command[0] =='quit':
self.conn.push("205 closing connection - goodbye!\r\n")
return True
def close(self):
self.conn.close()
self.buffer = None
self.conn = None
self.addr = None
class Responses:
conn = None
def __init__(self,conn,status):
self.conn = conn
if status == 205:
pass
elif status == 224:
self.conn.push('224 Overview information follows\r\n')
elif status == 240:
self.conn.push('240 article posted ok\r\n')
elif status == 340:
self.conn.push('340 send article to be posted. End with
<CR-LF>.<CR-LF>\r\n')
elif status == 411:
self.conn.push('411 no such news group\r\n')
elif status == 412:
self.conn.push('412 No news group current selected\r\n')
elif status == 420:
self.conn.push('420 No article(s) selected\r\n')
elif status == 440:
self.conn.push('440 posting not allowed\r\n')
elif status == 441:
self.conn.push('441 posting failed\r\n')
elif status == 502:
self.conn.push('502 no permission\r\n')
def main():
try:
nntpd = nntp_server('127.0.0.1',119)
asyncore.loop()
except KeyboardInterrupt:
print "Crtl+C pressed. Shutting down."
if __name__ == '__main__':
main()
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