//文件命名为main.go
//package mainimport ("fmt""net""os""strconv""strings""time"
)const WILL = 251
const WONT = 252
const DO = 253
const DONT = 254
const IAC = 255
const RD = 1
const SGA = 3func main() {var n int=0var count int=0var buf [8196]bytevar kkk[100]bytevar srcIP string="0.0.0.0"var timeout int=16var index int=1var params[68] stringfor k:=1;k<len(os.Args);k++{if os.Args[k]=="--interface" || os.Args[k]=="-S" {k++srcIP=os.Args[k]}else if os.Args[k]=="--timeout" || os.Args[k]=="-t" {k++timeout,_=strconv.Atoi(os.Args[k])}else{params[index]=os.Args[k]index++}}var localaddr net.TCPAddrvar remoteaddr net.TCPAddrlocaladdr.IP = net.ParseIP(srcIP)localaddr.Port = 0remoteaddr.IP = net.ParseIP(params[1])remoteaddr.Port,_= strconv.Atoi(params[2])conn, err := net.DialTCP("tcp", &localaddr, &remoteaddr)if err != nil {fmt.Println(err.Error())os.Exit(-1)}conn.SetReadDeadline(time.Now().Add(time.Second * 8))for {n, err = conn.Read(buf[0:])count:=n/3if buf[n-1-1]==byte(':') {fmt.Println(string(buf[0:n]))break}for i:=0;i<count;i++ {iac := buf[i * 3]   cmd := buf[i * 3 + 1]value := buf[i * 3 + 2]if (IAC != iac) {continue;}switch (cmd){case DO:kkk[0]=byte(iac)if value==RD {kkk[1]=byte(WILL)}else{kkk[1]=byte(WONT)}kkk[2]=byte(value)n, err = conn.Write(kkk[0:3])breakcase DONT:kkk[0]=byte(iac)kkk[1]=byte(WONT)kkk[2]=byte(value)n, err = conn.Write(kkk[0:3])breakcase WILL:kkk[0]=byte(iac)if value==SGA {kkk[1]=byte(DO)}else{kkk[1]=byte(DONT)}kkk[2]=byte(value)n, err = conn.Write(kkk[0:3])breakcase WONT:kkk[0]=byte(iac)kkk[1]=byte(DONT)kkk[2]=byte(value)n, err = conn.Write(kkk[0:3])breakdefault:break}}}if strings.Contains(string(buf[0:n]),"ogin:") {n, err = conn.Write([]byte(params[3]+"\r\n"))if err != nil {fmt.Println(err.Error())os.Exit(-1)}    }else{fmt.Println("Error!")os.Exit(-1)}count=0    conn.SetReadDeadline(time.Now().Add(time.Second * 8))for k:=0;k<len(buf);k++{buf[k]=0}for k:=0;k<68;k++ {n, err = conn.Read(buf[count:])if err != nil {fmt.Println(err.Error())break}count += nif strings.Contains(string(buf[0:count]),"assword:") {break}time.Sleep(time.Microsecond * 100000)}fmt.Print(string(buf[0:count]))if strings.Contains(string(buf[0:count]),"assword:") {n, err = conn.Write([]byte(params[3+1]+"\r\n"))if err != nil {fmt.Println(err.Error())os.Exit(-1)}}else{fmt.Println("Error!!!")os.Exit(-1)}conn.SetReadDeadline(time.Now().Add(time.Second * 8))for k:=0;k<68;k++ {n, err = conn.Read(buf[0:])if err != nil {fmt.Println(err.Error())break}fmt.Print(string(buf[0:n]))if strings.Contains(string(buf[0:n]),"# ") {break}time.Sleep(time.Microsecond * 100000)}n, err = conn.Write([]byte(params[5]+"\r\n"))if err != nil {fmt.Println(err.Error())os.Exit(-1)}conn.SetReadDeadline(time.Now().Add(time.Second * time.Duration(timeout)))for k:=0;k<timeout*100;k++ {n, err = conn.Read(buf[0:])if err != nil {fmt.Println(err.Error())break}fmt.Print(string(buf[0:n]))if strings.Contains(string(buf[0:n]),"# ") {break}time.Sleep(time.Microsecond * 10000)}os.Exit(0)
}

//编译命令格式如下：
go build -o telnet.exe main.go

//调用格式如下：
telnet --interface "本机的IP地址" "服务器的IP地址" "用户名" "密码" "要运行的命令行"
其中--interface为可选项