求高手帮忙!! 连接telnet的时候,为什么connect上 返回信息的地址里为空啊!

我想用程序连telnet 为什么recv收到的字节数和地址都为空啊~~
还有connect上 返回的信息是login和login's password吗 我直接send用户名和密码可以吗?
代码如下 望高手指点!! 拜求~ 拜求~ 
#include   <iostream.h>
#include <stdio.h>
#include<winsock2.h>
#include   "D:\Dev-Cpp\include\mstcpip.h"
#pragma comment( lib, "ws2_32.lib" )int   main(){
int   iLength   =   0;
int   iEnd   =   0;
int   err;
char   sBuff[1024]   =   "";
char   susrBuff[255]   =   "oracle\r\n";
char   rusrBuff[1024]="";

char   spasBuff[255]="orap650\r\n";
char   rpasBuff[1024]   =   "";

int   iMsg   =   0;   
WSADATA   Wsa;



WSAStartup(0x0101,&Wsa);
SOCKET   s   =   socket(AF_INET,SOCK_STREAM,0);

SOCKADDR_IN   sin;
sin.sin_addr.s_addr   =   inet_addr("10.48.96.8");

sin.sin_family   =   AF_INET;
//侦听端口
sin.sin_port   =   htons(23);

cout<<"connectting......"<<endl;
err = connect(s,(LPSOCKADDR)&sin,sizeof(sin));
if(err   ==   SOCKET_ERROR)
cout<<"Error:   can't   connect   to   server   :("<<endl;

iLength   =   recv(s,(LPSTR)sBuff,   strlen(sBuff),0);
iEnd   =   iLength;
sBuff[iEnd]   =   '\0';
if(iLength==SOCKET_ERROR)
cout<<"usr   rcv   err"<<endl;
else{

printf("%d\n",iLength);
printf("%s\n",sBuff);
cout<<"rec:"<<sBuff<<endl;
}   

//user   name
if(send(s,(LPSTR)susrBuff,strlen(susrBuff),0)==SOCKET_ERROR){
cout<<"usr   send   err"<<endl;
}
else{
cout<<"usr   send   success"<<endl;
}
iLength   =   recv(s,(LPSTR)rusrBuff,   strlen(rusrBuff),0);
iEnd   =   iLength;
rusrBuff[iEnd]   =   '\0';

if(iLength==SOCKET_ERROR)
cout<<"usr   rcv   err"<<endl;
else{
printf("%d\n",iLength);
printf("%s\n",sBuff);
cout<<"rec:"<<rusrBuff<<endl;
}   

//password
if(send(s,(LPSTR)(spasBuff),strlen(spasBuff),0)==SOCKET_ERROR){
cout<<"send   pass   err"<<endl;
}
else{
cout<<"pass   send   success"<<endl;
}


iLength   =   recv(s,(LPSTR)rpasBuff,strlen(rpasBuff),0);
iEnd   =   iLength;
rpasBuff[iEnd]   =   '\0';
if(iLength==SOCKET_ERROR)
cout<<"rcv   err"<<endl;
else{
printf("%d\n",iLength);
printf("%s\n",sBuff);
cout<<"rec:"<<rpasBuff<<endl;
}   
//关闭连接
closesocket(s);
WSACleanup();

int   i;
cin>>i;
return   0;

}