client.c

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#include <stdio.h>
#include <conio.h>
#include <winsock2.h>
#pragma comment(lib, "ws2_32.lib")
void main(int argc, char *argv[])
{ 
unsigned int m_hSocket;
WSADATA wsaData;
unsigned char *buf,*p;
char str[327];
int nConnect,i=0;
SOCKADDR_IN sockAddr;
if(argc<3 || argc>3)
{
printf("\nUsage: <connect-ip>   <connect-port>\n");
printf("Sample:    Client 219.156.225.126 23\n");
return;
}
buf = malloc(327);
memset(buf,0,327);
printf("[*] begin connect,waiting...\n");
if(WSAStartup(WINSOCK_VERSION,&wsaData))
{printf("[+] WSAStartup set failed!");
  return;
}
printf("[*] WSAStartup successful \n");
loop:
printf("[*] message:\n");
buf=str; gets(str);
m_hSocket=socket(PF_INET,SOCK_STREAM,0);
if(!m_hSocket)
{ 
 printf("[+] socket set failed!\n");
 exit(-1);
}
if(m_hSocket&&i==0)printf("[*] socket successful \n");
sockAddr.sin_family=AF_INET;
sockAddr.sin_port=htons((unsigned short)atoi(argv[2]));
sockAddr.sin_addr.S_un.S_addr=inet_addr(argv[1]);
nConnect=connect(m_hSocket,(LPSOCKADDR)&sockAddr,sizeof(sockAddr));
if(nConnect&&i==0)
  {printf("[+] connect failed ! \n");exit(-1);}
if(nConnect!=1)
{
  printf("[*] connect successful \n");
  send(m_hSocket,buf,327,0);
  clrscr();
  closesocket(m_hSocket);
  goto loop;
}
}