#include <stdio.h>
#include <winsock2.h>
#pragma comment(lib, "ws2_32.lib")
void main(int argc, char *argv[])
{ 
unsigned int i,m_hSocket;
WSADATA wsaData;
int nConnect;
SOCKADDR_IN sockAddr;
if(argc<4 || argc>4)
{
printf("\nUsage:     scan ip startport endport\n");
printf("Sample: scan 219.156.225.126 1 65535\n");
return;
}
printf("[*] begin scan,waiting...\n");
if(WSAStartup(WINSOCK_VERSION,&wsaData))
{printf("[+] WSAStartup set failed!");
  return;
}
printf("[+] port:");
for(i=(unsigned short)atoi(argv[2]);i<=(unsigned short)atoi(argv[3]);i++)
{
m_hSocket=socket(PF_INET,SOCK_STREAM,0);
if(!m_hSocket)
{ 
 printf("[+] socket set failed!\n");
 exit(-1);
}
sockAddr.sin_family=AF_INET;
sockAddr.sin_addr.S_un.S_addr=inet_addr(argv[1]);
sockAddr.sin_port=htons(i);
nConnect=connect(m_hSocket,(LPSOCKADDR)&sockAddr,sizeof(sockAddr));
if(nConnect)continue;
else printf("[%d]",i);
}
printf(" open");
printf("\n[*] ----scan end----\n");
exit(-1);
}