linux下简易端口扫描器

#include<iostream>
#include<string.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<arpa/inet.h>
#include<unistd.h>
using namespace std;

int main(int argc,char *argv[])
{
    int s;
    struct sockaddr_in server_addr;
    
    s=socket(AF_INET,SOCK_STREAM,0);
    if(s<0){
        cout<<"Init socket error"<<endl;
        return -1;
    }

    bzero(&server_addr,sizeof(server_addr));
    server_addr.sin_family=AF_INET;
    inet_pton(AF_INET, argv[1], &server_addr.sin_addr);
    
    for(int port=1;port<=65534;port++)
    { 
        server_addr.sin_port=htons(port);
        int err=connect(s,(struct sockaddr*)&server_addr,sizeof(server_addr));
        if(err!=-1){
            cout<<port<<":"<<"true"<<endl;
        }
    }
    return 0;
}