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- // 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
- }
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