// Copyright 2013 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package net import ( "errors" "fmt" "io/ioutil" "os" "sync" "testing" "time" ) // testUnixAddr uses ioutil.TempFile to get a name that is unique. // It also uses /tmp directory in case it is prohibited to create UNIX // sockets in TMPDIR. func testUnixAddr() string { f, err := ioutil.TempFile("", "go-nettest") if err != nil { panic(err) } addr := f.Name() f.Close() os.Remove(addr) return addr } func newLocalListener(network string) (Listener, error) { switch network { case "tcp": if supportsIPv4() { if ln, err := Listen("tcp4", "127.0.0.1:0"); err == nil { return ln, nil } } if supportsIPv6() { return Listen("tcp6", "[::1]:0") } case "tcp4": if supportsIPv4() { return Listen("tcp4", "127.0.0.1:0") } case "tcp6": if supportsIPv6() { return Listen("tcp6", "[::1]:0") } case "unix", "unixpacket": return Listen(network, testUnixAddr()) } return nil, fmt.Errorf("%s is not supported", network) } func newDualStackListener() (lns []*TCPListener, err error) { var args = []struct { network string TCPAddr }{ {"tcp4", TCPAddr{IP: IPv4(127, 0, 0, 1)}}, {"tcp6", TCPAddr{IP: IPv6loopback}}, } for i := 0; i < 64; i++ { var port int var lns []*TCPListener for _, arg := range args { arg.TCPAddr.Port = port ln, err := ListenTCP(arg.network, &arg.TCPAddr) if err != nil { continue } port = ln.Addr().(*TCPAddr).Port lns = append(lns, ln) } if len(lns) != len(args) { for _, ln := range lns { ln.Close() } continue } return lns, nil } return nil, errors.New("no dualstack port available") } type localServer struct { lnmu sync.RWMutex Listener done chan bool // signal that indicates server stopped } func (ls *localServer) buildup(handler func(*localServer, Listener)) error { go func() { handler(ls, ls.Listener) close(ls.done) }() return nil } func (ls *localServer) teardown() error { ls.lnmu.Lock() if ls.Listener != nil { network := ls.Listener.Addr().Network() address := ls.Listener.Addr().String() ls.Listener.Close() <-ls.done ls.Listener = nil switch network { case "unix", "unixpacket": os.Remove(address) } } ls.lnmu.Unlock() return nil } func newLocalServer(network string) (*localServer, error) { ln, err := newLocalListener(network) if err != nil { return nil, err } return &localServer{Listener: ln, done: make(chan bool)}, nil } type streamListener struct { network, address string Listener done chan bool // signal that indicates server stopped } func (sl *streamListener) newLocalServer() (*localServer, error) { return &localServer{Listener: sl.Listener, done: make(chan bool)}, nil } type dualStackServer struct { lnmu sync.RWMutex lns []streamListener port string cmu sync.RWMutex cs []Conn // established connections at the passive open side } func (dss *dualStackServer) buildup(handler func(*dualStackServer, Listener)) error { for i := range dss.lns { go func(i int) { handler(dss, dss.lns[i].Listener) close(dss.lns[i].done) }(i) } return nil } func (dss *dualStackServer) teardownNetwork(network string) error { dss.lnmu.Lock() for i := range dss.lns { if network == dss.lns[i].network && dss.lns[i].Listener != nil { dss.lns[i].Listener.Close() <-dss.lns[i].done dss.lns[i].Listener = nil } } dss.lnmu.Unlock() return nil } func (dss *dualStackServer) teardown() error { dss.lnmu.Lock() for i := range dss.lns { if dss.lns[i].Listener != nil { dss.lns[i].Listener.Close() <-dss.lns[i].done } } dss.lns = dss.lns[:0] dss.lnmu.Unlock() dss.cmu.Lock() for _, c := range dss.cs { c.Close() } dss.cs = dss.cs[:0] dss.cmu.Unlock() return nil } func newDualStackServer() (*dualStackServer, error) { lns, err := newDualStackListener() if err != nil { return nil, err } _, port, err := SplitHostPort(lns[0].Addr().String()) if err != nil { lns[0].Close() lns[1].Close() return nil, err } return &dualStackServer{ lns: []streamListener{ {network: "tcp4", address: lns[0].Addr().String(), Listener: lns[0], done: make(chan bool)}, {network: "tcp6", address: lns[1].Addr().String(), Listener: lns[1], done: make(chan bool)}, }, port: port, }, nil } func transponder(ln Listener, ch chan<- error) { defer close(ch) switch ln := ln.(type) { case *TCPListener: ln.SetDeadline(time.Now().Add(someTimeout)) case *UnixListener: ln.SetDeadline(time.Now().Add(someTimeout)) } c, err := ln.Accept() if err != nil { if perr := parseAcceptError(err); perr != nil { ch <- perr } ch <- err return } defer c.Close() network := ln.Addr().Network() if c.LocalAddr().Network() != network || c.RemoteAddr().Network() != network { ch <- fmt.Errorf("got %v->%v; expected %v->%v", c.LocalAddr().Network(), c.RemoteAddr().Network(), network, network) return } c.SetDeadline(time.Now().Add(someTimeout)) c.SetReadDeadline(time.Now().Add(someTimeout)) c.SetWriteDeadline(time.Now().Add(someTimeout)) b := make([]byte, 256) n, err := c.Read(b) if err != nil { if perr := parseReadError(err); perr != nil { ch <- perr } ch <- err return } if _, err := c.Write(b[:n]); err != nil { if perr := parseWriteError(err); perr != nil { ch <- perr } ch <- err return } } func transceiver(c Conn, wb []byte, ch chan<- error) { defer close(ch) c.SetDeadline(time.Now().Add(someTimeout)) c.SetReadDeadline(time.Now().Add(someTimeout)) c.SetWriteDeadline(time.Now().Add(someTimeout)) n, err := c.Write(wb) if err != nil { if perr := parseWriteError(err); perr != nil { ch <- perr } ch <- err return } if n != len(wb) { ch <- fmt.Errorf("wrote %d; want %d", n, len(wb)) } rb := make([]byte, len(wb)) n, err = c.Read(rb) if err != nil { if perr := parseReadError(err); perr != nil { ch <- perr } ch <- err return } if n != len(wb) { ch <- fmt.Errorf("read %d; want %d", n, len(wb)) } } func timeoutReceiver(c Conn, d, min, max time.Duration, ch chan<- error) { var err error defer func() { ch <- err }() t0 := time.Now() if err = c.SetReadDeadline(time.Now().Add(d)); err != nil { return } b := make([]byte, 256) var n int n, err = c.Read(b) t1 := time.Now() if n != 0 || err == nil || !err.(Error).Timeout() { err = fmt.Errorf("Read did not return (0, timeout): (%d, %v)", n, err) return } if dt := t1.Sub(t0); min > dt || dt > max && !testing.Short() { err = fmt.Errorf("Read took %s; expected %s", dt, d) return } } func timeoutTransmitter(c Conn, d, min, max time.Duration, ch chan<- error) { var err error defer func() { ch <- err }() t0 := time.Now() if err = c.SetWriteDeadline(time.Now().Add(d)); err != nil { return } var n int for { n, err = c.Write([]byte("TIMEOUT TRANSMITTER")) if err != nil { break } } t1 := time.Now() if err == nil || !err.(Error).Timeout() { err = fmt.Errorf("Write did not return (any, timeout): (%d, %v)", n, err) return } if dt := t1.Sub(t0); min > dt || dt > max && !testing.Short() { err = fmt.Errorf("Write took %s; expected %s", dt, d) return } } func newLocalPacketListener(network string) (PacketConn, error) { switch network { case "udp": if supportsIPv4() { return ListenPacket("udp4", "127.0.0.1:0") } if supportsIPv6() { return ListenPacket("udp6", "[::1]:0") } case "udp4": if supportsIPv4() { return ListenPacket("udp4", "127.0.0.1:0") } case "udp6": if supportsIPv6() { return ListenPacket("udp6", "[::1]:0") } case "unixgram": return ListenPacket(network, testUnixAddr()) } return nil, fmt.Errorf("%s is not supported", network) } func newDualStackPacketListener() (cs []*UDPConn, err error) { var args = []struct { network string UDPAddr }{ {"udp4", UDPAddr{IP: IPv4(127, 0, 0, 1)}}, {"udp6", UDPAddr{IP: IPv6loopback}}, } for i := 0; i < 64; i++ { var port int var cs []*UDPConn for _, arg := range args { arg.UDPAddr.Port = port c, err := ListenUDP(arg.network, &arg.UDPAddr) if err != nil { continue } port = c.LocalAddr().(*UDPAddr).Port cs = append(cs, c) } if len(cs) != len(args) { for _, c := range cs { c.Close() } continue } return cs, nil } return nil, errors.New("no dualstack port available") } type localPacketServer struct { pcmu sync.RWMutex PacketConn done chan bool // signal that indicates server stopped } func (ls *localPacketServer) buildup(handler func(*localPacketServer, PacketConn)) error { go func() { handler(ls, ls.PacketConn) close(ls.done) }() return nil } func (ls *localPacketServer) teardown() error { ls.pcmu.Lock() if ls.PacketConn != nil { network := ls.PacketConn.LocalAddr().Network() address := ls.PacketConn.LocalAddr().String() ls.PacketConn.Close() <-ls.done ls.PacketConn = nil switch network { case "unixgram": os.Remove(address) } } ls.pcmu.Unlock() return nil } func newLocalPacketServer(network string) (*localPacketServer, error) { c, err := newLocalPacketListener(network) if err != nil { return nil, err } return &localPacketServer{PacketConn: c, done: make(chan bool)}, nil } type packetListener struct { PacketConn } func (pl *packetListener) newLocalServer() (*localPacketServer, error) { return &localPacketServer{PacketConn: pl.PacketConn, done: make(chan bool)}, nil } func packetTransponder(c PacketConn, ch chan<- error) { defer close(ch) c.SetDeadline(time.Now().Add(someTimeout)) c.SetReadDeadline(time.Now().Add(someTimeout)) c.SetWriteDeadline(time.Now().Add(someTimeout)) b := make([]byte, 256) n, peer, err := c.ReadFrom(b) if err != nil { if perr := parseReadError(err); perr != nil { ch <- perr } ch <- err return } if peer == nil { // for connected-mode sockets switch c.LocalAddr().Network() { case "udp": peer, err = ResolveUDPAddr("udp", string(b[:n])) case "unixgram": peer, err = ResolveUnixAddr("unixgram", string(b[:n])) } if err != nil { ch <- err return } } if _, err := c.WriteTo(b[:n], peer); err != nil { if perr := parseWriteError(err); perr != nil { ch <- perr } ch <- err return } } func packetTransceiver(c PacketConn, wb []byte, dst Addr, ch chan<- error) { defer close(ch) c.SetDeadline(time.Now().Add(someTimeout)) c.SetReadDeadline(time.Now().Add(someTimeout)) c.SetWriteDeadline(time.Now().Add(someTimeout)) n, err := c.WriteTo(wb, dst) if err != nil { if perr := parseWriteError(err); perr != nil { ch <- perr } ch <- err return } if n != len(wb) { ch <- fmt.Errorf("wrote %d; want %d", n, len(wb)) } rb := make([]byte, len(wb)) n, _, err = c.ReadFrom(rb) if err != nil { if perr := parseReadError(err); perr != nil { ch <- perr } ch <- err return } if n != len(wb) { ch <- fmt.Errorf("read %d; want %d", n, len(wb)) } } func timeoutPacketReceiver(c PacketConn, d, min, max time.Duration, ch chan<- error) { var err error defer func() { ch <- err }() t0 := time.Now() if err = c.SetReadDeadline(time.Now().Add(d)); err != nil { return } b := make([]byte, 256) var n int n, _, err = c.ReadFrom(b) t1 := time.Now() if n != 0 || err == nil || !err.(Error).Timeout() { err = fmt.Errorf("ReadFrom did not return (0, timeout): (%d, %v)", n, err) return } if dt := t1.Sub(t0); min > dt || dt > max && !testing.Short() { err = fmt.Errorf("ReadFrom took %s; expected %s", dt, d) return } }