北邮计算机网络课程设计DNS服务器.doc
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北邮计算机网络课程设计DNS服务器
1 环境
操作系统随意,语言python2.7
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)
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