func main() {
defer envpprof.Stop()
listen := flag.Bool("l", false, "listen")
port := flag.Int("p", 0, "port to listen on")
flag.Parse()
var (
conn net.Conn
err error
)
if *listen {
s, err := utp.NewSocket("udp", fmt.Sprintf(":%d", *port))
if err != nil {
log.Fatal(err)
}
defer s.Close()
conn, err = s.Accept()
if err != nil {
log.Fatal(err)
}
} else {
conn, err = utp.Dial(net.JoinHostPort(flag.Arg(0), flag.Arg(1)))
if err != nil {
log.Fatal(err)
}
}
defer conn.Close()
go func() {
sig := make(chan os.Signal, 1)
signal.Notify(sig, os.Interrupt)
<-sig
conn.Close()
}()
writerDone := make(chan struct{})
readerDone := make(chan struct{})
go func() {
defer close(writerDone)
written, err := io.Copy(conn, os.Stdin)
if err != nil {
conn.Close()
log.Fatalf("error after writing %d bytes: %s", written, err)
}
log.Printf("wrote %d bytes", written)
conn.Close()
}()
go func() {
defer close(readerDone)
n, err := io.Copy(os.Stdout, conn)
if err != nil {
log.Fatal(err)
}
log.Printf("received %d bytes", n)
}()
// Technically we should wait until both reading and writing are done. But
// ucat-style binaries terminate abrubtly when read or write is completed,
// and no state remains to clean-up the peer neatly.
select {
case <-writerDone:
case <-readerDone:
}
}
func main() {
list := flag.Bool("l", false, "listen on the given address")
spew := flag.Bool("spew", false, "spew random data on the connection")
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage: %s [-l] <host> <port>\n", os.Args[0])
}
flag.Parse()
c := make(chan os.Signal)
signal.Notify(c, os.Interrupt)
if len(flag.Args()) < 2 {
flag.Usage()
os.Exit(1)
}
addr := fmt.Sprintf("%s:%s", flag.Arg(0), flag.Arg(1))
var con io.ReadWriteCloser
if *list {
sock, err := utp.NewSocket("udp", addr)
if err != nil {
fmt.Fprintf(os.Stderr, "create socket failed: %s\n", err)
os.Exit(1)
}
defer sock.Close()
utpcon, err := sock.Accept()
if err != nil {
fmt.Fprintf(os.Stderr, "accept failed: %s\n", err)
os.Exit(1)
}
con = utpcon
} else {
utpcon, err := utp.Dial(addr)
if err != nil {
fmt.Fprintf(os.Stderr, "dial failed: %s\n", err)
os.Exit(1)
}
con = utpcon
}
var in io.Reader = os.Stdin
if *spew {
in = rand.New()
}
go func() {
<-c
con.Close()
}()
beNetcat(con, in)
}
func main() {
defer envpprof.Stop()
listen := flag.Bool("l", false, "listen")
port := flag.Int("p", 0, "port to listen on")
flag.Parse()
var (
conn net.Conn
err error
)
if *listen {
s, err := utp.NewSocket("udp", fmt.Sprintf(":%d", *port))
if err != nil {
log.Fatal(err)
}
defer s.Close()
conn, err = s.Accept()
if err != nil {
log.Fatal(err)
}
} else {
conn, err = utp.Dial(net.JoinHostPort(flag.Arg(0), flag.Arg(1)))
if err != nil {
log.Fatal(err)
}
}
defer conn.Close()
go func() {
sig := make(chan os.Signal, 1)
signal.Notify(sig, os.Interrupt)
<-sig
conn.Close()
}()
writerDone := make(chan struct{})
go func() {
defer close(writerDone)
written, err := io.Copy(conn, os.Stdin)
if err != nil {
conn.Close()
log.Fatalf("error after writing %d bytes: %s", written, err)
}
log.Printf("wrote %d bytes", written)
conn.Close()
}()
n, err := io.Copy(os.Stdout, conn)
if err != nil {
log.Fatal(err)
}
log.Printf("received %d bytes", n)
// <-writerDone
}