Simple port scanner written in Python

1 #coding = Utf-82 3 " "4 python 3.45 a simple TCP port connection is given to determine whether the specified IP is open for the specified port. 6 " "7 8 ImportSocket9 ImportOptparseTen ImportRe One ImportThreading A ImportSYS -  - defAnlyze_host (target_host): the #Converts the target value obtained from the--host parameter to the standard xxx.xxx.xxx.xxx form, in which the gethostbyname function of the socket is used to convert the value of the domain name form to a four-bit point binary form -     Try: -Pattern = Re.compile (r'\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}')#matching standard point-in-IP -Match =Pattern.match (target_host) +         ifmatch: -             return(Match.group ()) +         Else: A             Try: atTarget_host = Socket.gethostbyname (target_host)#if not, parse the value of Target_host as the domain name -                 return(target_host) -             exceptException as err: -                 Print('Address resolution Error:', Err) - exit (0) -     exceptException as err: in         Print('Please note that error 1:', Sys.exc_info () [0],err] -         Print(parser.usage) to exit (0) +                      -  the defAnlyze_port (target_port): * #resolves the value passed in the--port parameter and returns a list of ports $     Try:Panax NotoginsengPattern = Re.compile (r'(\d+)-(\d+)')#Parse connector-pattern -Match =Pattern.match (Target_port) the         ifmatch: +start_port = Int (Match.group (1)) Aend_port = Int (Match.group (2)) the             return([x forXinchRange (Start_port,end_port + 1)]) +         Else: -             return([Int (x) forXinchTarget_port.split (',')]) $     exceptException as err: $         Print('Please note that error 2:', Sys.exc_info () [0],err] -         Print(parser.usage) - exit (0) the  - defScanner (target_host,target_port):Wuyi #Create a Socket object thes =Socket.socket (Socket.af_inet,socket. SOCK_STREAM) -S.settimeout (5) Wu     Try: - S.connect ((target_host,target_port)) About         #S.sendall (b ' hello\r\n\r\n ') $         #message = S.RECV (+) -         #If message: -         Print('[+]%s%3s port: Open'% (Target_host,target_port))#If a connection can be established, it indicates that the port is open -            #print ('%s '% message.decode (' utf-8 ')) A     exceptsocket.timeout: +         Print('[-]%s%3s port: Off'% (Target_host,target_port))#if the connection times out, this port is closed the     exceptException as err: -         Print('Please note that error 3:', Sys.exc_info () [0],err] $ exit (0) the  the  the          the defMain (): -Usage ='usage:%prog-h ' inParser = Optparse. Optionparser (usage,version='%prog v1.0') theParser.add_option ('--host', dest='Target_host', type='string', thehelp='host, domain, or IP that needs to be scanned') AboutParser.add_option ('--port', dest='Target_port', type='string', thehelp='host ports that need to be scanned, support 1-100 or 21,53,80 two forms') the(Options,args) =Parser.parse_args () the    ifOptions.target_host = = NoneorOptions.target_port = =None: +       Print(parser.usage) - exit (0) the    Else:BayiTarget_host =Options.target_host theTarget_port =Options.target_port the  -Target_host =anlyze_host (target_host) -Target_port =Anlyze_port (Target_port) the  the     forPortinchTarget_port: thet = Threading. Thread (target=scanner,args= (Target_host,port))#Multi-threaded scan port the T.start () -  the if __name__=='__main__': the Main ()  

The result of the operation is:

1C:\Python34\python.exe tcpscanner.py--host 192.168.2.1--port 1-10242[+]192.168.2. 1 of 25 Ports: Open3[+]192.168.2. 1 of 110 Ports: Open4[+]192.168.2. 1 of 119 ports: Open5[+]192.168.2. 1 of 143 ports: Open6[+]192.168.2. 1 of 465 ports: Open7[+]192.168.2. 1 of 563 ports: Open8[+]192.168.2. 1 of 587 ports: Open9[+]192.168.2. 1 of 993 ports: OpenTen[+]192.168.2. 1 of 995 ports: Open One[+]192.168.2. 1 of 80 ports: Open A[-]192.168.2. 1 of 1 ports: Off -[-]192.168.2. 1 of 18 ports: off -[-]192.168.2. 1 of 4 ports: Off the[-]192.168.2. 1 of 8 ports: off -[-]192.168.2. 1 of 13 ports: off -[-]192.168.2. 1 of 9 ports: off -[-]192.168.2. 1 of 42 ports: Off +[-]192.168.2. 1 of 19 ports: Off -[-]192.168.2. 1 of 67 ports: Off +[-]192.168.2. 1 of 21 ports: off A[-]192.168.2. 1 of 14 ports: off at[-]192.168.2. 1 of 17 ports: off -......

Simple port scanner written in Python