tcp udp port scan

#!/usr/local/bin/python3#Coding:utf-8Importstring, Subprocesstcptmpstr= ((Subprocess.check_output (["netstat","-NTLP"]). Decode ('Utf-8') . Strip () Udptmpstr= ((Subprocess.check_output (["netstat","-nulp"]). Decode ('Utf-8') . Strip ()#get TCP port and servicedefGettcpservice (TCPTMPSTR): Tmplist= Tcptmpstr.split ("\ n")#del Tmplist[0:2]NewList = [] forIinchTmplist:val=I.split ()delVal[0:3]

q : A local ISP hosted our SQL Server, but I can't see or connect to a named instance running on that computer. I know that the SQL Server 2000 named instance does not use TCP/IP 1433 ports and that the TCP/IP port used by the SQL Server instance is open. Do you have any suggestions? A: Many people know how to use the SQL Server Network Utility or the SQL Serve

Sockets (socket) programming has three kinds, streaming socket (sock_stream), datagram Socket (SOCK_DGRAM), the original socket (SOCK_RAW); Socket programming based on TCP is a streaming socket (sock_stream). Datagram Sockets (SOCK_DGRAM) based on UDP. Programming steps for 1.TCP streaming sockets You must link library functions before using: Engineering-> set->l

The bad translation will be seen. A software port (usually just called a "port") is a virtual data connection that can be used to exchange data directly, rather than through files or other temporary storage locations. The most common of these are TCP and UDP ports, which are used to exchange data between computers on

It can be broadly divided into two ways:1. Call Nmap for port scanningMsfconsoleNmap-v-SV www.cstc.org.cnScan results (port opening and operational information for the target service operating system)PORT State SERVICE VERSION21/TCP Open FTP Microsoft ftpd80/TCP Open http Ap

available distributed Hash table. Many applications have developed it based on it, for example, many instant messaging software and reliable CD tag libraries.Unfortunately, two hosts behind different NAT cannot establish a TCP connection, because both of them allow only outgoing connections. The Nat seller has developed the port ing function for the NAT device to solve this problem. The Nat administrator c

__author__ = ' Administrator ' Import socket# TCP client Target_host = ' www.51cto.com ' Target_port = 80# af_inet is a standard IPV4 address or host name, Sock_stream represents the way TCP is the client = Socket.socket (socket.af_inet, socket. SOCK_STREAM) # Establish Connection Client.connect ((Target_host, Target_port)) # Send data client.send (' get/http/1.1\r\n host:51cto.com\r\n \ r \ n ') # receives

TCP/UDP are both network programming (sockets) based on the C/s structure of the program.UDP: Non-reliable connection speed, server: Create socket binding IP and port directly from the specified IP and port to receive data without listening; client: Create socket, receive data directly, do not need to establish a conne

that the overall interaction is 6W per second and 6W receive, and the resulting bandwidth up and down line is 60MB, which basically has the test environment 1Gb bandwidth ran out. This is true from the system's resource manager. Test Case 2This test mainly set the message sent to 4K, because of the network environment, you can only put the test tools and services on the same PC. and the number of connections tested dropped to 2000 The test results reflect that the socket reads and writes are a

Code1/********************************2 UDP_SERVER.C3 *********************************/4 #include 5 #include 6 #include 7 #include 8 #include 9 #include Ten #include #include 12#define PORT 12345int main ()15 {16/*1 Create socket*/+ int sd = socket (pf_inet, SOCK_DGRAM, 0);if (SD = =-1)19 {Perror ("Socket failed");Exit (-1);22}23/*2 Preparation Address */Sockaddr_in addr, a struct;addr.sin_family = pf_inet;Addr.sin_port = htons (

); server_addr.sin_addr.s_addr = inet_addr (IP); my_conn ECT (fd_client, (PSA) server_addr, sizeof (SA); printf ("Connect success! \ N ");/* Send a data and return the data from the server */INT val_in, val_out, Len; while (scanf (" % d ", val_in) = 1) {my_send ( Len, fd_client, (void *) val_in, sizeof (INT); my_recv ( Len, fd_client, (void *) val_out, sizeof (INT); printf ("Recv fron server: % d \ n", val_out);} my_close (fd_client); Return 0 ;}// Compile gcc -o server server.c -lmy_socket

# Nc-Z localhost 1-10000 // scan ports 1 to 1000 of the Local Machine to obtain the opened portConnection to localhost 22 port [TCP/ssh] succeeded!Connection to localhost 80 port [TCP/HTTP] succeeded!Connection to localhost 111 port