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// Copyright 2009 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 (
"context"
"internal/itoa"
"io"
"net/netip"
"os"
"syscall"
"time"
)
// BUG(mikio): On JS and Windows, the File method of TCPConn and
// TCPListener is not implemented.
// TCPAddr represents the address of a TCP end point.
type TCPAddr struct {
IP IP
Port int
Zone string // IPv6 scoped addressing zone
}
// AddrPort returns the TCPAddr a as a netip.AddrPort.
//
// If a.Port does not fit in a uint16, it's silently truncated.
//
// If a is nil, a zero value is returned.
func (a *TCPAddr) AddrPort() netip.AddrPort {
if a == nil {
return netip.AddrPort{}
}
na, _ := netip.AddrFromSlice(a.IP)
na = na.WithZone(a.Zone)
return netip.AddrPortFrom(na, uint16(a.Port))
}
// Network returns the address's network name, "tcp".
func (a *TCPAddr) Network() string { return "tcp" }
func (a *TCPAddr) String() string {
if a == nil {
return "<nil>"
}
ip := ipEmptyString(a.IP)
if a.Zone != "" {
return JoinHostPort(ip+"%"+a.Zone, itoa.Itoa(a.Port))
}
return JoinHostPort(ip, itoa.Itoa(a.Port))
}
func (a *TCPAddr) isWildcard() bool {
if a == nil || a.IP == nil {
return true
}
return a.IP.IsUnspecified()
}
func (a *TCPAddr) opAddr() Addr {
if a == nil {
return nil
}
return a
}
// ResolveTCPAddr returns an address of TCP end point.
//
// The network must be a TCP network name.
//
// If the host in the address parameter is not a literal IP address or
// the port is not a literal port number, ResolveTCPAddr resolves the
// address to an address of TCP end point.
// Otherwise, it parses the address as a pair of literal IP address
// and port number.
// The address parameter can use a host name, but this is not
// recommended, because it will return at most one of the host name's
// IP addresses.
//
// See func Dial for a description of the network and address
// parameters.
func ResolveTCPAddr(network, address string) (*TCPAddr, error) {
switch network {
case "tcp", "tcp4", "tcp6":
case "": // a hint wildcard for Go 1.0 undocumented behavior
network = "tcp"
default:
return nil, UnknownNetworkError(network)
}
addrs, err := DefaultResolver.internetAddrList(context.Background(), network, address)
if err != nil {
return nil, err
}
return addrs.forResolve(network, address).(*TCPAddr), nil
}
// TCPAddrFromAddrPort returns addr as a TCPAddr. If addr.IsValid() is false,
// then the returned TCPAddr will contain a nil IP field, indicating an
// address family-agnostic unspecified address.
func TCPAddrFromAddrPort(addr netip.AddrPort) *TCPAddr {
return &TCPAddr{
IP: addr.Addr().AsSlice(),
Zone: addr.Addr().Zone(),
Port: int(addr.Port()),
}
}
// TCPConn is an implementation of the Conn interface for TCP network
// connections.
type TCPConn struct {
conn
}
// SyscallConn returns a raw network connection.
// This implements the syscall.Conn interface.
func (c *TCPConn) SyscallConn() (syscall.RawConn, error) {
if !c.ok() {
return nil, syscall.EINVAL
}
return newRawConn(c.fd)
}
// ReadFrom implements the io.ReaderFrom ReadFrom method.
func (c *TCPConn) ReadFrom(r io.Reader) (int64, error) {
if !c.ok() {
return 0, syscall.EINVAL
}
n, err := c.readFrom(r)
if err != nil && err != io.EOF {
err = &OpError{Op: "readfrom", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
}
return n, err
}
// CloseRead shuts down the reading side of the TCP connection.
// Most callers should just use Close.
func (c *TCPConn) CloseRead() error {
if !c.ok() {
return syscall.EINVAL
}
if err := c.fd.closeRead(); err != nil {
return &OpError{Op: "close", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
}
return nil
}
// CloseWrite shuts down the writing side of the TCP connection.
// Most callers should just use Close.
func (c *TCPConn) CloseWrite() error {
if !c.ok() {
return syscall.EINVAL
}
if err := c.fd.closeWrite(); err != nil {
return &OpError{Op: "close", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
}
return nil
}
// SetLinger sets the behavior of Close on a connection which still
// has data waiting to be sent or to be acknowledged.
//
// If sec < 0 (the default), the operating system finishes sending the
// data in the background.
//
// If sec == 0, the operating system discards any unsent or
// unacknowledged data.
//
// If sec > 0, the data is sent in the background as with sec < 0. On
// some operating systems after sec seconds have elapsed any remaining
// unsent data may be discarded.
func (c *TCPConn) SetLinger(sec int) error {
if !c.ok() {
return syscall.EINVAL
}
if err := setLinger(c.fd, sec); err != nil {
return &OpError{Op: "set", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
}
return nil
}
// SetKeepAlive sets whether the operating system should send
// keep-alive messages on the connection.
func (c *TCPConn) SetKeepAlive(keepalive bool) error {
if !c.ok() {
return syscall.EINVAL
}
if err := setKeepAlive(c.fd, keepalive); err != nil {
return &OpError{Op: "set", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
}
return nil
}
// SetKeepAlivePeriod sets period between keep-alives.
func (c *TCPConn) SetKeepAlivePeriod(d time.Duration) error {
if !c.ok() {
return syscall.EINVAL
}
if err := setKeepAlivePeriod(c.fd, d); err != nil {
return &OpError{Op: "set", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
}
return nil
}
// SetNoDelay controls whether the operating system should delay
// packet transmission in hopes of sending fewer packets (Nagle's
// algorithm). The default is true (no delay), meaning that data is
// sent as soon as possible after a Write.
func (c *TCPConn) SetNoDelay(noDelay bool) error {
if !c.ok() {
return syscall.EINVAL
}
if err := setNoDelay(c.fd, noDelay); err != nil {
return &OpError{Op: "set", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
}
return nil
}
func newTCPConn(fd *netFD, keepAlive time.Duration, keepAliveHook func(time.Duration)) *TCPConn {
setNoDelay(fd, true)
if keepAlive == 0 {
keepAlive = defaultTCPKeepAlive
}
if keepAlive > 0 {
setKeepAlive(fd, true)
setKeepAlivePeriod(fd, keepAlive)
if keepAliveHook != nil {
keepAliveHook(keepAlive)
}
}
return &TCPConn{conn{fd}}
}
// DialTCP acts like Dial for TCP networks.
//
// The network must be a TCP network name; see func Dial for details.
//
// If laddr is nil, a local address is automatically chosen.
// If the IP field of raddr is nil or an unspecified IP address, the
// local system is assumed.
func DialTCP(network string, laddr, raddr *TCPAddr) (*TCPConn, error) {
switch network {
case "tcp", "tcp4", "tcp6":
default:
return nil, &OpError{Op: "dial", Net: network, Source: laddr.opAddr(), Addr: raddr.opAddr(), Err: UnknownNetworkError(network)}
}
if raddr == nil {
return nil, &OpError{Op: "dial", Net: network, Source: laddr.opAddr(), Addr: nil, Err: errMissingAddress}
}
sd := &sysDialer{network: network, address: raddr.String()}
c, err := sd.dialTCP(context.Background(), laddr, raddr)
if err != nil {
return nil, &OpError{Op: "dial", Net: network, Source: laddr.opAddr(), Addr: raddr.opAddr(), Err: err}
}
return c, nil
}
// TCPListener is a TCP network listener. Clients should typically
// use variables of type Listener instead of assuming TCP.
type TCPListener struct {
fd *netFD
lc ListenConfig
}
// SyscallConn returns a raw network connection.
// This implements the syscall.Conn interface.
//
// The returned RawConn only supports calling Control. Read and
// Write return an error.
func (l *TCPListener) SyscallConn() (syscall.RawConn, error) {
if !l.ok() {
return nil, syscall.EINVAL
}
return newRawListener(l.fd)
}
// AcceptTCP accepts the next incoming call and returns the new
// connection.
func (l *TCPListener) AcceptTCP() (*TCPConn, error) {
if !l.ok() {
return nil, syscall.EINVAL
}
c, err := l.accept()
if err != nil {
return nil, &OpError{Op: "accept", Net: l.fd.net, Source: nil, Addr: l.fd.laddr, Err: err}
}
return c, nil
}
// Accept implements the Accept method in the Listener interface; it
// waits for the next call and returns a generic Conn.
func (l *TCPListener) Accept() (Conn, error) {
if !l.ok() {
return nil, syscall.EINVAL
}
c, err := l.accept()
if err != nil {
return nil, &OpError{Op: "accept", Net: l.fd.net, Source: nil, Addr: l.fd.laddr, Err: err}
}
return c, nil
}
// Close stops listening on the TCP address.
// Already Accepted connections are not closed.
func (l *TCPListener) Close() error {
if !l.ok() {
return syscall.EINVAL
}
if err := l.close(); err != nil {
return &OpError{Op: "close", Net: l.fd.net, Source: nil, Addr: l.fd.laddr, Err: err}
}
return nil
}
// Addr returns the listener's network address, a *TCPAddr.
// The Addr returned is shared by all invocations of Addr, so
// do not modify it.
func (l *TCPListener) Addr() Addr { return l.fd.laddr }
// SetDeadline sets the deadline associated with the listener.
// A zero time value disables the deadline.
func (l *TCPListener) SetDeadline(t time.Time) error {
if !l.ok() {
return syscall.EINVAL
}
if err := l.fd.pfd.SetDeadline(t); err != nil {
return &OpError{Op: "set", Net: l.fd.net, Source: nil, Addr: l.fd.laddr, Err: err}
}
return nil
}
// File returns a copy of the underlying os.File.
// It is the caller's responsibility to close f when finished.
// Closing l does not affect f, and closing f does not affect l.
//
// The returned os.File's file descriptor is different from the
// connection's. Attempting to change properties of the original
// using this duplicate may or may not have the desired effect.
func (l *TCPListener) File() (f *os.File, err error) {
if !l.ok() {
return nil, syscall.EINVAL
}
f, err = l.file()
if err != nil {
return nil, &OpError{Op: "file", Net: l.fd.net, Source: nil, Addr: l.fd.laddr, Err: err}
}
return
}
// ListenTCP acts like Listen for TCP networks.
//
// The network must be a TCP network name; see func Dial for details.
//
// If the IP field of laddr is nil or an unspecified IP address,
// ListenTCP listens on all available unicast and anycast IP addresses
// of the local system.
// If the Port field of laddr is 0, a port number is automatically
// chosen.
func ListenTCP(network string, laddr *TCPAddr) (*TCPListener, error) {
switch network {
case "tcp", "tcp4", "tcp6":
default:
return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: laddr.opAddr(), Err: UnknownNetworkError(network)}
}
if laddr == nil {
laddr = &TCPAddr{}
}
sl := &sysListener{network: network, address: laddr.String()}
ln, err := sl.listenTCP(context.Background(), laddr)
if err != nil {
return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: laddr.opAddr(), Err: err}
}
return ln, nil
}
// roundDurationUp rounds d to the next multiple of to.
func roundDurationUp(d time.Duration, to time.Duration) time.Duration {
return (d + to - 1) / to
}