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