北邮计算机网络课程设计DNS服务器_北邮dns
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北邮计算机网络课程设计DNS服务器环境
操作系统随意，语言python2.7
2.文件
Socket.py 说明
完成缓存检测，确定是回应，还是转发，如果是回应，确定是本地回应还是外部应答转发
import socket import mydic import charhandle import makeframe
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)port = 53
the_dic = mydic.get_web_ip()client_request = {} client_request_index = {} reverse_map = {} key_record = 0 client_wait = []
s.bind(('',port))
time_rest = 0 request_general = ''
print 'running' while True:
try:
msg ,(client,port)= s.recvfrom(1024)
except:
print 'Time out!'
continue
request = []
request = list(msg)
requre_web = charhandle.get_request(request[12:])
website = ''.join(requre_web)
if(port == 53):
answer = []
answer = list(msg)
print “Type:Remote Response”
print “remote answer is: ”
response_ip = msg[-4]+msg[-3]+msg[-2]+msg[-1]
char_ip = socket.inet_ntoa(response_ip)
print website + ' has the ip : '+char_ip
fre = mydic.storeForUpdate(website,char_ip)
print 'with the frequence of '+ str(fre)
###real_request = client_request[request[0]+request[1]]
for each_client in client_wait:
my_key = client_request[request[0]+request[1]+str(each_client)]
if client_request_index.get(my_key)!= None :
s.sendto(msg,client_request_index[my_key])
print “Response to ip and Client port:”
print client_request_index[my_key]
break
else:
print “Type: Client Request”
print “ip and port：”
print(client,port)
### requre_web = charhandle.get_request(request[12:])
### website = ''.join(requre_web)
print “Request website:”+website
if(the_dic.get(website)!= None):
print “Found in local cache:”
re_ip = the_dic.get(website)
print re_ip
fre = mydic.storeForUpdate(website)
print re_ip[0]+' with frequence '+str(fre)
zhen = makeframe.make(re_ip[0],msg)
s.sendto(zhen,(client,port))
else:
print “need to ask remote server”
key_record = key_record + 1
request_general = key_record
client_request[request[0]+request[1]+str(client)] = request_general
client_request_index[request_general] =(client,port)
if client not in client_wait:
client_wait.append(client)
# select authority DNS server as you wish
s.sendto(msg,('10.3.9.4',53))
time_rest = time_rest+1
try:
if(time_rest == 50):
print 'pay attention'
print '
#'
mydic.updateCache()
print '
#'
the_dic = mydic.get_web_ip()
time_rest = 0
except:
print 'not valid frequence'
print '--------------------' s.close()
Mydic.py 完成本地查询，LRU算法维护本地缓存，socket.py第97行的time_request值可以确定更新缓存的频率，可以直接输出在dnsrelay.txt内，但是为了方便观测变化，我输出到了dnsrelaycopy.txt里面，运行一段时间之后，可以去看看学习到的新条目
import pickle import os import threading A=[] d_web_ip = {} d_ip_web = {} update_dic = {}
data = open('dnsrelay.txt')for each_line in data:
try:
(ip,sitecopy)= each_line.split(' ',1)
(site,nothing)= str(sitecopy).split('n',1)
d_web_ip[site] = [ip,1]
d_ip_web[ip] = site
except:
print 'file error'
data.close()
try:
with open('newdnsrelay.pickle','wb')as newdnsrelay_file:
pickle.dump(d_web_ip,newdnsrelay_file)except IOError as err:
print 'File error:'+str(err)except pickle.PickleError as perr:
print 'Pickling error:'+str(perr)
def get_web_ip():
with open('newdnsrelay.pickle','rb')as f:
global update_dic
update_dic = pickle.load(f)
return update_dic.copy()
return(None)
def storeForUpdate(web_site, add = None):
global update_dic
if(update_dic.get(web_site)!= None):
add_frequen = update_dic[web_site]
add_frequen[1] = add_frequen[1] + 1
print web_site+' frequence incrase 1,with ip '+add_frequen[0]
return add_frequen[1]
else:
update_dic[web_site] = [add,1]
print 'record for a new site'
return 1
def updateCache():
global update_dic
m = update_dic.copy()
t = threading.Thread(target = my_thread,kwargs = m)
print 'ready to update local cache'
t.start()
t.join()
def my_thread(*argu,**arg):
frequence = []
remain_dic = {}
for each_key in arg:
tmp = arg[each_key]
if(tmp[1] not in frequence):
frequence.append(tmp[1])
if(tmp[0] == '0.0.0.0'):
remain_dic[each_key] = '0.0.0.0'
print 'various frequence:'
for each in frequence:
print 'have '+ str(each)
for each_key in remain_dic:
arg.pop(each_key)#enimilate ban
i = 0
while(i
max_frequence = max(frequence)
for each_key in arg:
tmp = arg[each_key]
if(tmp[1] == max_frequence):
remain_dic[each_key] = tmp[0]
i = i + 1
if(i == 30):
break;
frequence.remove(max_frequence)
if(not frequence):###no more
break;
updateFile(remain_dic)
def updateFile(new_dic):
f = open('dnsrelaycopy.txt','w')
for each_key in new_dic:
word = str(new_dic[each_key])+ ' ' + str(each_key)
f.write(word)
f.write('n')
new_dic[each_key] = [new_dic[each_key],0]
try:
with open('newdnsrelay.pickle','wb')as newdnsrelay_file:
pickle.dump(new_dic,newdnsrelay_file)
except IOError as err:
print 'File error:'+str(err)
except pickle.PickleError as perr:
print 'Pickling error:'+str(perr)
Makefram.py 成帧模块，形成对外围权威服务器的询问帧
import socket
def make(re_ip,msg):
tmp_list = []
for ch in msg:
tmp_list.append(ch)
tmp_list[4:12] = ['x00','x01','x00','x01','x00','x00','x00','x00']
tmp_list = tmp_list+['xc0','x0c','x00','x01','x00 ','x01','x00','x00','x02','x58','x00','x04']
dive_ip = socket.inet_aton(re_ip)
ch_ip = []
for each_ch in dive_ip:
ch_ip.append(each_ch)
tmp_list = tmp_list + ch_ip
re_msg = ''.join(tmp_list)
return re_msg
Charhandle.py 提取出报文中的url
def get_request(your_list):
my_list = []
new_list = []
my_list.extend(your_list)
re_list = []
thelen = ord(my_list[0])
try:
while thelen!= 0:
new_list = new_list + my_list[1:thelen+1]
my_list[0:thelen+1] = []
thelen = ord(my_list[0])
new_list.append('.')
except IndexError:
print “bao wen ge shi bu dui”
new_list.pop()
return new_list
原始的dnsrelay.txt老师给出了，自己去弄，把四个py文件放一个目录下，再放一个dnsrelay.txt 然后，用python shell 打开 socket.py 从python shell 运行，或者直接F5，记得把本地dns手动指向本机。
P.S：本人亲测，蒋老师没用过python，从头到尾就是我讲他听，从不为难我，我说有个LRU算法，他还说我做的好！
如果有不懂的 联系作者：302969722@qq.com 学妹优先
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