2011-09-16 17:47:21 +02:00
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// 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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2012-01-13 06:11:45 +01:00
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// +build darwin freebsd linux netbsd openbsd windows
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2011-10-27 01:57:58 +02:00
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2012-12-13 00:13:29 +01:00
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// Raw IP sockets for POSIX
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2011-09-16 17:47:21 +02:00
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package net
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import (
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"syscall"
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2012-11-21 08:03:38 +01:00
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"time"
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2011-09-16 17:47:21 +02:00
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)
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func sockaddrToIP(sa syscall.Sockaddr) Addr {
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switch sa := sa.(type) {
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case *syscall.SockaddrInet4:
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2012-12-13 00:13:29 +01:00
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return &IPAddr{IP: sa.Addr[0:]}
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2011-09-16 17:47:21 +02:00
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case *syscall.SockaddrInet6:
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2012-12-13 00:13:29 +01:00
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return &IPAddr{IP: sa.Addr[0:], Zone: zoneToString(int(sa.ZoneId))}
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2011-09-16 17:47:21 +02:00
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}
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return nil
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}
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func (a *IPAddr) family() int {
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2011-10-27 01:57:58 +02:00
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if a == nil || len(a.IP) <= IPv4len {
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2011-09-16 17:47:21 +02:00
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return syscall.AF_INET
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}
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if a.IP.To4() != nil {
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return syscall.AF_INET
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}
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return syscall.AF_INET6
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}
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2012-03-30 23:27:11 +02:00
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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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2011-12-03 03:17:34 +01:00
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func (a *IPAddr) sockaddr(family int) (syscall.Sockaddr, error) {
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2012-12-13 00:13:29 +01:00
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return ipToSockaddr(family, a.IP, 0, a.Zone)
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2011-09-16 17:47:21 +02:00
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}
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func (a *IPAddr) toAddr() sockaddr {
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if a == nil { // nil *IPAddr
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return nil // nil interface
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}
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return a
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}
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// IPConn is the implementation of the Conn and PacketConn
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// interfaces for IP network connections.
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type IPConn struct {
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2012-10-23 06:31:11 +02:00
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conn
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2011-09-16 17:47:21 +02:00
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}
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2012-10-23 06:31:11 +02:00
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func newIPConn(fd *netFD) *IPConn { return &IPConn{conn{fd}} }
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2011-09-16 17:47:21 +02:00
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2012-10-03 07:27:36 +02:00
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// ReadFromIP reads an IP packet from c, copying the payload into b.
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2011-09-16 17:47:21 +02:00
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// It returns the number of bytes copied into b and the return address
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// that was on the packet.
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//
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// ReadFromIP can be made to time out and return an error with
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2012-01-25 22:54:22 +01:00
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// Timeout() == true after a fixed time limit; see SetDeadline and
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// SetReadDeadline.
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2012-02-01 20:26:59 +01:00
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func (c *IPConn) ReadFromIP(b []byte) (int, *IPAddr, error) {
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2011-09-16 17:47:21 +02:00
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if !c.ok() {
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2012-03-02 21:01:37 +01:00
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return 0, nil, syscall.EINVAL
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2011-09-16 17:47:21 +02:00
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}
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// TODO(cw,rsc): consider using readv if we know the family
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// type to avoid the header trim/copy
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2012-02-01 20:26:59 +01:00
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var addr *IPAddr
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2011-09-16 17:47:21 +02:00
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n, sa, err := c.fd.ReadFrom(b)
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switch sa := sa.(type) {
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case *syscall.SockaddrInet4:
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2012-12-13 00:13:29 +01:00
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addr = &IPAddr{IP: sa.Addr[0:]}
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2011-10-27 01:57:58 +02:00
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if len(b) >= IPv4len { // discard ipv4 header
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2011-09-16 17:47:21 +02:00
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hsize := (int(b[0]) & 0xf) * 4
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copy(b, b[hsize:])
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n -= hsize
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}
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case *syscall.SockaddrInet6:
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2012-12-13 00:13:29 +01:00
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addr = &IPAddr{IP: sa.Addr[0:], Zone: zoneToString(int(sa.ZoneId))}
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2011-09-16 17:47:21 +02:00
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}
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2012-02-01 20:26:59 +01:00
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return n, addr, err
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2011-09-16 17:47:21 +02:00
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}
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2012-02-01 20:26:59 +01:00
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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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2011-09-16 17:47:21 +02:00
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if !c.ok() {
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2012-03-02 21:01:37 +01:00
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return 0, nil, syscall.EINVAL
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2011-09-16 17:47:21 +02:00
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}
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2012-12-13 00:13:29 +01:00
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n, addr, err := c.ReadFromIP(b)
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return n, addr.toAddr(), err
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2011-09-16 17:47:21 +02:00
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}
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2012-10-23 06:31:11 +02:00
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// ReadMsgIP reads a packet from c, copying the payload into b and the
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// associdated 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 packet and the source address of the packet.
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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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var sa syscall.Sockaddr
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n, oobn, flags, sa, err = c.fd.ReadMsg(b, oob)
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switch sa := sa.(type) {
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case *syscall.SockaddrInet4:
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2012-12-13 00:13:29 +01:00
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addr = &IPAddr{IP: sa.Addr[0:]}
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2012-10-23 06:31:11 +02:00
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case *syscall.SockaddrInet6:
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2012-12-13 00:13:29 +01:00
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addr = &IPAddr{IP: sa.Addr[0:], Zone: zoneToString(int(sa.ZoneId))}
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2012-10-23 06:31:11 +02:00
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}
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return
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}
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2012-10-03 07:27:36 +02:00
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// WriteToIP writes an IP packet to addr via c, copying the payload from b.
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2011-09-16 17:47:21 +02:00
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//
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// WriteToIP can be made to time out and return
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// an error with Timeout() == true after a fixed time limit;
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2012-01-25 22:54:22 +01:00
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// see SetDeadline and SetWriteDeadline.
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2011-09-16 17:47:21 +02:00
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// On packet-oriented connections, write timeouts are rare.
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2012-02-01 20:26:59 +01:00
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func (c *IPConn) WriteToIP(b []byte, addr *IPAddr) (int, error) {
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2011-09-16 17:47:21 +02:00
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if !c.ok() {
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2012-03-02 21:01:37 +01:00
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return 0, syscall.EINVAL
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2011-09-16 17:47:21 +02:00
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}
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2012-02-01 20:26:59 +01:00
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sa, err := addr.sockaddr(c.fd.family)
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if err != nil {
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return 0, &OpError{"write", c.fd.net, addr, err}
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2011-09-16 17:47:21 +02:00
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}
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return c.fd.WriteTo(b, sa)
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}
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2012-02-01 20:26:59 +01:00
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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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2011-09-16 17:47:21 +02:00
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if !c.ok() {
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2012-03-02 21:01:37 +01:00
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return 0, syscall.EINVAL
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2011-09-16 17:47:21 +02:00
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}
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a, ok := addr.(*IPAddr)
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if !ok {
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2012-03-02 21:01:37 +01:00
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return 0, &OpError{"write", c.fd.net, addr, syscall.EINVAL}
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2011-09-16 17:47:21 +02:00
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}
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return c.WriteToIP(b, a)
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}
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2012-10-23 06:31:11 +02:00
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// WriteMsgIP writes a packet 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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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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sa, err := addr.sockaddr(c.fd.family)
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if err != nil {
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return 0, 0, &OpError{"write", c.fd.net, addr, err}
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}
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return c.fd.WriteMsg(b, oob, sa)
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}
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2012-01-25 21:56:26 +01:00
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// DialIP connects to the remote address raddr on the network protocol netProto,
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// which must be "ip", "ip4", or "ip6" followed by a colon and a protocol number or name.
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2012-02-01 20:26:59 +01:00
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func DialIP(netProto string, laddr, raddr *IPAddr) (*IPConn, error) {
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2012-11-21 08:03:38 +01:00
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return dialIP(netProto, laddr, raddr, noDeadline)
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}
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func dialIP(netProto string, laddr, raddr *IPAddr, deadline time.Time) (*IPConn, error) {
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2012-02-01 20:26:59 +01:00
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net, proto, err := parseDialNetwork(netProto)
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2011-09-16 17:47:21 +02:00
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if err != nil {
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2012-02-01 20:26:59 +01:00
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return nil, err
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2011-09-16 17:47:21 +02:00
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}
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switch net {
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case "ip", "ip4", "ip6":
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default:
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2012-11-21 08:03:38 +01:00
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return nil, UnknownNetworkError(netProto)
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2011-09-16 17:47:21 +02:00
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}
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if raddr == nil {
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2012-02-01 20:26:59 +01:00
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return nil, &OpError{"dial", netProto, nil, errMissingAddress}
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2011-09-16 17:47:21 +02:00
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}
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2012-11-21 08:03:38 +01:00
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fd, err := internetSocket(net, laddr.toAddr(), raddr.toAddr(), deadline, syscall.SOCK_RAW, proto, "dial", sockaddrToIP)
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2012-02-01 20:26:59 +01:00
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if err != nil {
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return nil, err
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2011-09-16 17:47:21 +02:00
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}
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return newIPConn(fd), nil
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}
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// ListenIP listens for incoming IP packets addressed to the
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// local address laddr. The returned connection c's ReadFrom
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// and WriteTo methods can be used to receive and send IP
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// packets with per-packet addressing.
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2012-02-01 20:26:59 +01:00
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func ListenIP(netProto string, laddr *IPAddr) (*IPConn, error) {
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net, proto, err := parseDialNetwork(netProto)
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2011-09-16 17:47:21 +02:00
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if err != nil {
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2012-02-01 20:26:59 +01:00
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return nil, err
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2011-09-16 17:47:21 +02:00
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}
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switch net {
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case "ip", "ip4", "ip6":
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default:
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2012-11-21 08:03:38 +01:00
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return nil, UnknownNetworkError(netProto)
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2011-09-16 17:47:21 +02:00
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}
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2012-11-21 08:03:38 +01:00
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fd, err := internetSocket(net, laddr.toAddr(), nil, noDeadline, syscall.SOCK_RAW, proto, "listen", sockaddrToIP)
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2012-02-01 20:26:59 +01:00
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if err != nil {
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return nil, err
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2011-09-16 17:47:21 +02:00
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}
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return newIPConn(fd), nil
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}
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