add log for debug
add log for debug

eliteYang/tcpcopy,ycaihua/tcpcopy,sshling/tcpcopy,sshling/tcpcopy,ycaihua/tcpcopy,horryq/tcpcopy,liviusATnetskope/second,daodaoliang/tcpcopy,daodaoliang/tcpcopy,wfxiang08/tcpcopy,caosiyang/tcpcopy,left2right/tcpcopy,horryq/tcpcopy,u20024804/tcpcopy,left2right/tcpcopy,caosiyang/tcpcopy,wfxiang08/tcpcopy,liviusATnetskope/second,u20024804/tcpcopy,eliteYang/tcpcopy