240 lines
7.1 KiB
Go
240 lines
7.1 KiB
Go
// Copyright 2010 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"
|
|
"syscall"
|
|
)
|
|
|
|
// BUG(mikio): On every POSIX platform, reads from the "ip4" network
|
|
// using the ReadFrom or ReadFromIP method might not return a complete
|
|
// IPv4 packet, including its header, even if there is space
|
|
// available. This can occur even in cases where Read or ReadMsgIP
|
|
// could return a complete packet. For this reason, it is recommended
|
|
// that you do not use these methods if it is important to receive a
|
|
// full packet.
|
|
//
|
|
// The Go 1 compatibility guidelines make it impossible for us to
|
|
// change the behavior of these methods; use Read or ReadMsgIP
|
|
// instead.
|
|
|
|
// BUG(mikio): On JS and Plan 9, methods and functions related
|
|
// to IPConn are not implemented.
|
|
|
|
// BUG(mikio): On Windows, the File method of IPConn is not
|
|
// implemented.
|
|
|
|
// IPAddr represents the address of an IP end point.
|
|
type IPAddr struct {
|
|
IP IP
|
|
Zone string // IPv6 scoped addressing zone
|
|
}
|
|
|
|
// Network returns the address's network name, "ip".
|
|
func (a *IPAddr) Network() string { return "ip" }
|
|
|
|
func (a *IPAddr) String() string {
|
|
if a == nil {
|
|
return "<nil>"
|
|
}
|
|
ip := ipEmptyString(a.IP)
|
|
if a.Zone != "" {
|
|
return ip + "%" + a.Zone
|
|
}
|
|
return ip
|
|
}
|
|
|
|
func (a *IPAddr) isWildcard() bool {
|
|
if a == nil || a.IP == nil {
|
|
return true
|
|
}
|
|
return a.IP.IsUnspecified()
|
|
}
|
|
|
|
func (a *IPAddr) opAddr() Addr {
|
|
if a == nil {
|
|
return nil
|
|
}
|
|
return a
|
|
}
|
|
|
|
// ResolveIPAddr returns an address of IP end point.
|
|
//
|
|
// The network must be an IP network name.
|
|
//
|
|
// If the host in the address parameter is not a literal IP address,
|
|
// ResolveIPAddr resolves the address to an address of IP end point.
|
|
// Otherwise, it parses the address as a literal IP address.
|
|
// 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 ResolveIPAddr(network, address string) (*IPAddr, error) {
|
|
if network == "" { // a hint wildcard for Go 1.0 undocumented behavior
|
|
network = "ip"
|
|
}
|
|
afnet, _, err := parseNetwork(context.Background(), network, false)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
switch afnet {
|
|
case "ip", "ip4", "ip6":
|
|
default:
|
|
return nil, UnknownNetworkError(network)
|
|
}
|
|
addrs, err := DefaultResolver.internetAddrList(context.Background(), afnet, address)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return addrs.forResolve(network, address).(*IPAddr), nil
|
|
}
|
|
|
|
// IPConn is the implementation of the Conn and PacketConn interfaces
|
|
// for IP network connections.
|
|
type IPConn struct {
|
|
conn
|
|
}
|
|
|
|
// SyscallConn returns a raw network connection.
|
|
// This implements the syscall.Conn interface.
|
|
func (c *IPConn) SyscallConn() (syscall.RawConn, error) {
|
|
if !c.ok() {
|
|
return nil, syscall.EINVAL
|
|
}
|
|
return newRawConn(c.fd)
|
|
}
|
|
|
|
// ReadFromIP acts like ReadFrom but returns an IPAddr.
|
|
func (c *IPConn) ReadFromIP(b []byte) (int, *IPAddr, error) {
|
|
if !c.ok() {
|
|
return 0, nil, syscall.EINVAL
|
|
}
|
|
n, addr, err := c.readFrom(b)
|
|
if err != nil {
|
|
err = &OpError{Op: "read", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
|
|
}
|
|
return n, addr, err
|
|
}
|
|
|
|
// ReadFrom implements the PacketConn ReadFrom method.
|
|
func (c *IPConn) ReadFrom(b []byte) (int, Addr, error) {
|
|
if !c.ok() {
|
|
return 0, nil, syscall.EINVAL
|
|
}
|
|
n, addr, err := c.readFrom(b)
|
|
if err != nil {
|
|
err = &OpError{Op: "read", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
|
|
}
|
|
if addr == nil {
|
|
return n, nil, err
|
|
}
|
|
return n, addr, err
|
|
}
|
|
|
|
// ReadMsgIP reads a message from c, copying the payload into b and
|
|
// the associated out-of-band data into oob. It returns the number of
|
|
// bytes copied into b, the number of bytes copied into oob, the flags
|
|
// that were set on the message and the source address of the message.
|
|
//
|
|
// The packages golang.org/x/net/ipv4 and golang.org/x/net/ipv6 can be
|
|
// used to manipulate IP-level socket options in oob.
|
|
func (c *IPConn) ReadMsgIP(b, oob []byte) (n, oobn, flags int, addr *IPAddr, err error) {
|
|
if !c.ok() {
|
|
return 0, 0, 0, nil, syscall.EINVAL
|
|
}
|
|
n, oobn, flags, addr, err = c.readMsg(b, oob)
|
|
if err != nil {
|
|
err = &OpError{Op: "read", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
|
|
}
|
|
return
|
|
}
|
|
|
|
// WriteToIP acts like WriteTo but takes an IPAddr.
|
|
func (c *IPConn) WriteToIP(b []byte, addr *IPAddr) (int, error) {
|
|
if !c.ok() {
|
|
return 0, syscall.EINVAL
|
|
}
|
|
n, err := c.writeTo(b, addr)
|
|
if err != nil {
|
|
err = &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addr.opAddr(), Err: err}
|
|
}
|
|
return n, err
|
|
}
|
|
|
|
// WriteTo implements the PacketConn WriteTo method.
|
|
func (c *IPConn) WriteTo(b []byte, addr Addr) (int, error) {
|
|
if !c.ok() {
|
|
return 0, syscall.EINVAL
|
|
}
|
|
a, ok := addr.(*IPAddr)
|
|
if !ok {
|
|
return 0, &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addr, Err: syscall.EINVAL}
|
|
}
|
|
n, err := c.writeTo(b, a)
|
|
if err != nil {
|
|
err = &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: a.opAddr(), Err: err}
|
|
}
|
|
return n, err
|
|
}
|
|
|
|
// WriteMsgIP writes a message to addr via c, copying the payload from
|
|
// b and the associated out-of-band data from oob. It returns the
|
|
// number of payload and out-of-band bytes written.
|
|
//
|
|
// The packages golang.org/x/net/ipv4 and golang.org/x/net/ipv6 can be
|
|
// used to manipulate IP-level socket options in oob.
|
|
func (c *IPConn) WriteMsgIP(b, oob []byte, addr *IPAddr) (n, oobn int, err error) {
|
|
if !c.ok() {
|
|
return 0, 0, syscall.EINVAL
|
|
}
|
|
n, oobn, err = c.writeMsg(b, oob, addr)
|
|
if err != nil {
|
|
err = &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addr.opAddr(), Err: err}
|
|
}
|
|
return
|
|
}
|
|
|
|
func newIPConn(fd *netFD) *IPConn { return &IPConn{conn{fd}} }
|
|
|
|
// DialIP acts like Dial for IP networks.
|
|
//
|
|
// The network must be an IP 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 DialIP(network string, laddr, raddr *IPAddr) (*IPConn, error) {
|
|
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.dialIP(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
|
|
}
|
|
|
|
// ListenIP acts like ListenPacket for IP networks.
|
|
//
|
|
// The network must be an IP network name; see func Dial for details.
|
|
//
|
|
// If the IP field of laddr is nil or an unspecified IP address,
|
|
// ListenIP listens on all available IP addresses of the local system
|
|
// except multicast IP addresses.
|
|
func ListenIP(network string, laddr *IPAddr) (*IPConn, error) {
|
|
if laddr == nil {
|
|
laddr = &IPAddr{}
|
|
}
|
|
sl := &sysListener{network: network, address: laddr.String()}
|
|
c, err := sl.listenIP(context.Background(), laddr)
|
|
if err != nil {
|
|
return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: laddr.opAddr(), Err: err}
|
|
}
|
|
return c, nil
|
|
}
|