C ++ port scanner and Port Scanner

C ++ port scanner and Port Scanner
I. Principle

The principle of port scanning is very simple, that is, to establish socket communication and switch over the port without passing through the connect function. If it succeeds, it indicates the port developer; otherwise, the port is closed.

Familiar with all the socket programs, this content is in the window environment

Second, single-thread implementation

 

// PortScanf. cpp: defines the entry point of the console application. // # Define WIN32_LEAN_AND_MEAN # include "stdafx. h "# include <WinSock2.h> # pragma comment (lib," Ws2_32 ") int scant (char * Ip, int StartPort, int EndPort) {WSADATA wsa; SOCKET s; struct sockaddr_in server; int CurrPort; // current port int ret; WSAStartup (MAKEWORD (2, 2), & wsa); // before using the winsock function, you must use the WSAStartup function to load and initialize the dynamic Connection Library server. sin_family = AF_INET; // specify the address format. In winsock, you can only use AF_INETserver.sin_addr.s_addr = inet_addr (Ip); // specify IP address to be scanned for (CurrPort = StartPort; CurrPort <= EndPort; CurrPort ++) {s = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); server. sin_port = htons (CurrPort); // specify the port number of the IP address to be scanned. ret = connect (s, (struct sockaddr *) & server, sizeof (server )); // Connect if (0 = ret) // determine whether the connection is successful {printf ("% s: % d Success O (Success _ Success) O ~~ \ N ", Ip, CurrPort); closesocket (s);} else {printf (" % s: % d Failed \ n ", Ip, CurrPort );}} printf ("Cost time: % f second \ n", CostTime); // WSACleanup (); // release the dynamic Connection Library and release the created socket return 1;} int main () {scant ("127.0.0.1", 75,100); return 0 ;}

　　

 

Third, multi-thread implementation

Because the execution speed of a single thread is slow, we add multiple threads to run the program,

typedef struct _tagValue{int start;int end;}PortNums;void _cdecl beginThreadFunc1(LPVOID lpParam) {PortNums *pnInt = (PortNums*)lpParam;scan("127.0.0.1", pnInt->start, pnInt->end);}int a(){PortNums m1;m1.start = 70;m1.end = 500;PortNums m2;m2.start = 501;m2.end = 1000;_beginthread(beginThreadFunc1, 0, &m1);_beginthread(beginThreadFunc1, 0, &m2);getchar();return 0;}

Note: # include <process. h>