1 files changed, 227 insertions, 0 deletions
diff --git a/src/net/iprawsock_posix.go b/src/net/iprawsock_posix.go
new file mode 100644
index 000000000..99b081ba8
--- /dev/null
+++ b/src/net/iprawsock_posix.go
@@ -0,0 +1,227 @@
+// 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.
+
+// +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris windows
+
+package net
+
+import (
+	"syscall"
+	"time"
+)
+
+// 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 uses 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.
+
+func sockaddrToIP(sa syscall.Sockaddr) Addr {
+	switch sa := sa.(type) {
+	case *syscall.SockaddrInet4:
+		return &IPAddr{IP: sa.Addr[0:]}
+	case *syscall.SockaddrInet6:
+		return &IPAddr{IP: sa.Addr[0:], Zone: zoneToString(int(sa.ZoneId))}
+	}
+	return nil
+}
+
+func (a *IPAddr) family() int {
+	if a == nil || len(a.IP) <= IPv4len {
+		return syscall.AF_INET
+	}
+	if a.IP.To4() != nil {
+		return syscall.AF_INET
+	}
+	return syscall.AF_INET6
+}
+
+func (a *IPAddr) isWildcard() bool {
+	if a == nil || a.IP == nil {
+		return true
+	}
+	return a.IP.IsUnspecified()
+}
+
+func (a *IPAddr) sockaddr(family int) (syscall.Sockaddr, error) {
+	if a == nil {
+		return nil, nil
+	}
+	return ipToSockaddr(family, a.IP, 0, a.Zone)
+}
+
+// IPConn is the implementation of the Conn and PacketConn interfaces
+// for IP network connections.
+type IPConn struct {
+	conn
+}
+
+func newIPConn(fd *netFD) *IPConn { return &IPConn{conn{fd}} }
+
+// ReadFromIP reads an IP packet from c, copying the payload into b.
+// It returns the number of bytes copied into b and the return address
+// that was on the packet.
+//
+// ReadFromIP can be made to time out and return an error with
+// Timeout() == true after a fixed time limit; see SetDeadline and
+// SetReadDeadline.
+func (c *IPConn) ReadFromIP(b []byte) (int, *IPAddr, error) {
+	if !c.ok() {
+		return 0, nil, syscall.EINVAL
+	}
+	// TODO(cw,rsc): consider using readv if we know the family
+	// type to avoid the header trim/copy
+	var addr *IPAddr
+	n, sa, err := c.fd.readFrom(b)
+	switch sa := sa.(type) {
+	case *syscall.SockaddrInet4:
+		addr = &IPAddr{IP: sa.Addr[0:]}
+		if len(b) >= IPv4len { // discard ipv4 header
+			hsize := (int(b[0]) & 0xf) * 4
+			copy(b, b[hsize:])
+			n -= hsize
+		}
+	case *syscall.SockaddrInet6:
+		addr = &IPAddr{IP: sa.Addr[0:], Zone: zoneToString(int(sa.ZoneId))}
+	}
+	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.ReadFromIP(b)
+	return n, addr.toAddr(), err
+}
+
+// ReadMsgIP reads a packet 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 packet and the source address of the packet.
+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
+	}
+	var sa syscall.Sockaddr
+	n, oobn, flags, sa, err = c.fd.readMsg(b, oob)
+	switch sa := sa.(type) {
+	case *syscall.SockaddrInet4:
+		addr = &IPAddr{IP: sa.Addr[0:]}
+	case *syscall.SockaddrInet6:
+		addr = &IPAddr{IP: sa.Addr[0:], Zone: zoneToString(int(sa.ZoneId))}
+	}
+	return
+}
+
+// WriteToIP writes an IP packet to addr via c, copying the payload
+// from b.
+//
+// WriteToIP can be made to time out and return an error with
+// Timeout() == true after a fixed time limit; see SetDeadline and
+// SetWriteDeadline.  On packet-oriented connections, write timeouts
+// are rare.
+func (c *IPConn) WriteToIP(b []byte, addr *IPAddr) (int, error) {
+	if !c.ok() {
+		return 0, syscall.EINVAL
+	}
+	if c.fd.isConnected {
+		return 0, &OpError{Op: "write", Net: c.fd.net, Addr: addr, Err: ErrWriteToConnected}
+	}
+	if addr == nil {
+		return 0, &OpError{Op: "write", Net: c.fd.net, Addr: nil, Err: errMissingAddress}
+	}
+	sa, err := addr.sockaddr(c.fd.family)
+	if err != nil {
+		return 0, &OpError{"write", c.fd.net, addr, err}
+	}
+	return c.fd.writeTo(b, sa)
+}
+
+// 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{"write", c.fd.net, addr, syscall.EINVAL}
+	}
+	return c.WriteToIP(b, a)
+}
+
+// WriteMsgIP writes a packet 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.
+func (c *IPConn) WriteMsgIP(b, oob []byte, addr *IPAddr) (n, oobn int, err error) {
+	if !c.ok() {
+		return 0, 0, syscall.EINVAL
+	}
+	if c.fd.isConnected {
+		return 0, 0, &OpError{Op: "write", Net: c.fd.net, Addr: addr, Err: ErrWriteToConnected}
+	}
+	if addr == nil {
+		return 0, 0, &OpError{Op: "write", Net: c.fd.net, Addr: nil, Err: errMissingAddress}
+	}
+	sa, err := addr.sockaddr(c.fd.family)
+	if err != nil {
+		return 0, 0, &OpError{"write", c.fd.net, addr, err}
+	}
+	return c.fd.writeMsg(b, oob, sa)
+}
+
+// DialIP connects to the remote address raddr on the network protocol
+// netProto, which must be "ip", "ip4", or "ip6" followed by a colon
+// and a protocol number or name.
+func DialIP(netProto string, laddr, raddr *IPAddr) (*IPConn, error) {
+	return dialIP(netProto, laddr, raddr, noDeadline)
+}
+
+func dialIP(netProto string, laddr, raddr *IPAddr, deadline time.Time) (*IPConn, error) {
+	net, proto, err := parseNetwork(netProto)
+	if err != nil {
+		return nil, &OpError{Op: "dial", Net: netProto, Addr: raddr, Err: err}
+	}
+	switch net {
+	case "ip", "ip4", "ip6":
+	default:
+		return nil, &OpError{Op: "dial", Net: netProto, Addr: raddr, Err: UnknownNetworkError(netProto)}
+	}
+	if raddr == nil {
+		return nil, &OpError{Op: "dial", Net: netProto, Addr: nil, Err: errMissingAddress}
+	}
+	fd, err := internetSocket(net, laddr, raddr, deadline, syscall.SOCK_RAW, proto, "dial")
+	if err != nil {
+		return nil, &OpError{Op: "dial", Net: netProto, Addr: raddr, Err: err}
+	}
+	return newIPConn(fd), nil
+}
+
+// ListenIP listens for incoming IP packets addressed to the local
+// address laddr.  The returned connection's ReadFrom and WriteTo
+// methods can be used to receive and send IP packets with per-packet
+// addressing.
+func ListenIP(netProto string, laddr *IPAddr) (*IPConn, error) {
+	net, proto, err := parseNetwork(netProto)
+	if err != nil {
+		return nil, &OpError{Op: "dial", Net: netProto, Addr: laddr, Err: err}
+	}
+	switch net {
+	case "ip", "ip4", "ip6":
+	default:
+		return nil, &OpError{Op: "listen", Net: netProto, Addr: laddr, Err: UnknownNetworkError(netProto)}
+	}
+	fd, err := internetSocket(net, laddr, nil, noDeadline, syscall.SOCK_RAW, proto, "listen")
+	if err != nil {
+		return nil, &OpError{Op: "listen", Net: netProto, Addr: laddr, Err: err}
+	}
+	return newIPConn(fd), nil
+}