tcp端口扫描

最新推荐文章于 2022-11-02 00:01:27 发布

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最新推荐文章于 2022-11-02 00:01:27 发布

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文章标签： c++ 算法

本文链接：https://blog.youkuaiyun.com/weixin_44406096/article/details/108514496

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TCP connect()扫描
扫描原理：
通过建立tcp连接判断是否开启了端口

#include <winsock2.h>
#include <ws2tcpip.h>
#include<process.h>
#include<windows.h>
#include <stdio.h>
char tgtIP[20] ;//定义目的地址
char port[5];
int Maxport=100;
int Scan(void* port);//发送数据函数
int main( int argc , char *argv[] )
{

    HANDLE ThreadHandle[Maxport];
    WSADATA wsaData;
    if(argc<=2)
    {
        printf("请输入IP和端口号");
        return 0;
    }
    strcpy(port,argv[2]);
    strcpy(tgtIP,argv[1]);
    int pNOW=atoi(port);
    if ( WSAStartup(MAKEWORD(2,2),&wsaData))
    {
        printf("初始化WinSock失败\n");
        exit(0);
    }
    printf("开始扫描请稍等....\n");
    for(int i = 0; i < Maxport; i++)
    {

		//开启新线程
        ThreadHandle[i] = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)Scan,&pNOW,0,NULL);
        pNOW++;
		//防止线程创建过快
        Sleep(100);
    }
    DWORD WaitThread = WaitForMultipleObjects( 20 , ThreadHandle , TRUE , INFINITE );
    if( WaitThread != WAIT_FAILED)
    {
        for( int n = 0 ; n < Maxport ; n++ )
        {
            CloseHandle( ThreadHandle[n] );
        }
    }
    WSACleanup();
    return 0;
}

//扫描端口的函数
int Scan(void* port)
{
    SOCKET sock;
    SOCKADDR_IN sin;
    int portNow=*(int*)port;
    int ret;
    if((sock =socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==INVALID_SOCKET )
    {
        printf("Socket Setup Error...\n");
        return 0;
    }

    sin.sin_family = AF_INET;
    sin.sin_port = htons(portNow);
    sin.sin_addr.S_un.S_addr = inet_addr(tgtIP);
    ret=connect (sock, (struct sockaddr *)&sin,
                 sizeof (struct sockaddr_in));
    if(ret>=0)
        printf("端口%d开启\n",portNow);


}