1 files changed, 305 insertions, 0 deletions
diff --git a/src/pkg/net/iprawsock_posix.go b/src/pkg/net/iprawsock_posix.go
new file mode 100644
index 0000000000..4e11518006
--- /dev/null
+++ b/src/pkg/net/iprawsock_posix.go
@@ -0,0 +1,305 @@
+// 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.
+
+// (Raw) IP sockets
+
+package net
+
+import (
+	"os"
+	"sync"
+	"syscall"
+)
+
+var onceReadProtocols sync.Once
+
+func sockaddrToIP(sa syscall.Sockaddr) Addr {
+	switch sa := sa.(type) {
+	case *syscall.SockaddrInet4:
+		return &IPAddr{sa.Addr[0:]}
+	case *syscall.SockaddrInet6:
+		return &IPAddr{sa.Addr[0:]}
+	}
+	return nil
+}
+
+func (a *IPAddr) family() int {
+	if a == nil || len(a.IP) <= 4 {
+		return syscall.AF_INET
+	}
+	if a.IP.To4() != nil {
+		return syscall.AF_INET
+	}
+	return syscall.AF_INET6
+}
+
+func (a *IPAddr) sockaddr(family int) (syscall.Sockaddr, os.Error) {
+	return ipToSockaddr(family, a.IP, 0)
+}
+
+func (a *IPAddr) toAddr() sockaddr {
+	if a == nil { // nil *IPAddr
+		return nil // nil interface
+	}
+	return a
+}
+
+// IPConn is the implementation of the Conn and PacketConn
+// interfaces for IP network connections.
+type IPConn struct {
+	fd *netFD
+}
+
+func newIPConn(fd *netFD) *IPConn { return &IPConn{fd} }
+
+func (c *IPConn) ok() bool { return c != nil && c.fd != nil }
+
+// Implementation of the Conn interface - see Conn for documentation.
+
+// Read implements the net.Conn Read method.
+func (c *IPConn) Read(b []byte) (n int, err os.Error) {
+	n, _, err = c.ReadFrom(b)
+	return
+}
+
+// Write implements the net.Conn Write method.
+func (c *IPConn) Write(b []byte) (n int, err os.Error) {
+	if !c.ok() {
+		return 0, os.EINVAL
+	}
+	return c.fd.Write(b)
+}
+
+// Close closes the IP connection.
+func (c *IPConn) Close() os.Error {
+	if !c.ok() {
+		return os.EINVAL
+	}
+	err := c.fd.Close()
+	c.fd = nil
+	return err
+}
+
+// LocalAddr returns the local network address.
+func (c *IPConn) LocalAddr() Addr {
+	if !c.ok() {
+		return nil
+	}
+	return c.fd.laddr
+}
+
+// RemoteAddr returns the remote network address, a *IPAddr.
+func (c *IPConn) RemoteAddr() Addr {
+	if !c.ok() {
+		return nil
+	}
+	return c.fd.raddr
+}
+
+// SetTimeout implements the net.Conn SetTimeout method.
+func (c *IPConn) SetTimeout(nsec int64) os.Error {
+	if !c.ok() {
+		return os.EINVAL
+	}
+	return setTimeout(c.fd, nsec)
+}
+
+// SetReadTimeout implements the net.Conn SetReadTimeout method.
+func (c *IPConn) SetReadTimeout(nsec int64) os.Error {
+	if !c.ok() {
+		return os.EINVAL
+	}
+	return setReadTimeout(c.fd, nsec)
+}
+
+// SetWriteTimeout implements the net.Conn SetWriteTimeout method.
+func (c *IPConn) SetWriteTimeout(nsec int64) os.Error {
+	if !c.ok() {
+		return os.EINVAL
+	}
+	return setWriteTimeout(c.fd, nsec)
+}
+
+// SetReadBuffer sets the size of the operating system's
+// receive buffer associated with the connection.
+func (c *IPConn) SetReadBuffer(bytes int) os.Error {
+	if !c.ok() {
+		return os.EINVAL
+	}
+	return setReadBuffer(c.fd, bytes)
+}
+
+// SetWriteBuffer sets the size of the operating system's
+// transmit buffer associated with the connection.
+func (c *IPConn) SetWriteBuffer(bytes int) os.Error {
+	if !c.ok() {
+		return os.EINVAL
+	}
+	return setWriteBuffer(c.fd, bytes)
+}
+
+// IP-specific methods.
+
+// ReadFromIP reads a 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 SetTimeout and
+// SetReadTimeout.
+func (c *IPConn) ReadFromIP(b []byte) (n int, addr *IPAddr, err os.Error) {
+	if !c.ok() {
+		return 0, nil, os.EINVAL
+	}
+	// TODO(cw,rsc): consider using readv if we know the family
+	// type to avoid the header trim/copy
+	n, sa, err := c.fd.ReadFrom(b)
+	switch sa := sa.(type) {
+	case *syscall.SockaddrInet4:
+		addr = &IPAddr{sa.Addr[0:]}
+		if len(b) >= 4 { // discard ipv4 header
+			hsize := (int(b[0]) & 0xf) * 4
+			copy(b, b[hsize:])
+			n -= hsize
+		}
+	case *syscall.SockaddrInet6:
+		addr = &IPAddr{sa.Addr[0:]}
+	}
+	return
+}
+
+// ReadFrom implements the net.PacketConn ReadFrom method.
+func (c *IPConn) ReadFrom(b []byte) (n int, addr Addr, err os.Error) {
+	if !c.ok() {
+		return 0, nil, os.EINVAL
+	}
+	n, uaddr, err := c.ReadFromIP(b)
+	return n, uaddr.toAddr(), err
+}
+
+// WriteToIP writes a 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 SetTimeout and SetWriteTimeout.
+// On packet-oriented connections, write timeouts are rare.
+func (c *IPConn) WriteToIP(b []byte, addr *IPAddr) (n int, err os.Error) {
+	if !c.ok() {
+		return 0, os.EINVAL
+	}
+	sa, err1 := addr.sockaddr(c.fd.family)
+	if err1 != nil {
+		return 0, &OpError{Op: "write", Net: "ip", Addr: addr, Error: err1}
+	}
+	return c.fd.WriteTo(b, sa)
+}
+
+// WriteTo implements the net.PacketConn WriteTo method.
+func (c *IPConn) WriteTo(b []byte, addr Addr) (n int, err os.Error) {
+	if !c.ok() {
+		return 0, os.EINVAL
+	}
+	a, ok := addr.(*IPAddr)
+	if !ok {
+		return 0, &OpError{"writeto", "ip", addr, os.EINVAL}
+	}
+	return c.WriteToIP(b, a)
+}
+
+var protocols map[string]int
+
+func readProtocols() {
+	protocols = make(map[string]int)
+	if file, err := open("/etc/protocols"); err == nil {
+		for line, ok := file.readLine(); ok; line, ok = file.readLine() {
+			// tcp    6   TCP    # transmission control protocol
+			if i := byteIndex(line, '#'); i >= 0 {
+				line = line[0:i]
+			}
+			f := getFields(line)
+			if len(f) < 2 {
+				continue
+			}
+			if proto, _, ok := dtoi(f[1], 0); ok {
+				protocols[f[0]] = proto
+				for _, alias := range f[2:] {
+					protocols[alias] = proto
+				}
+			}
+		}
+		file.close()
+	}
+}
+
+func splitNetProto(netProto string) (net string, proto int, err os.Error) {
+	onceReadProtocols.Do(readProtocols)
+	i := last(netProto, ':')
+	if i < 0 { // no colon
+		return "", 0, os.NewError("no IP protocol specified")
+	}
+	net = netProto[0:i]
+	protostr := netProto[i+1:]
+	proto, i, ok := dtoi(protostr, 0)
+	if !ok || i != len(protostr) {
+		// lookup by name
+		proto, ok = protocols[protostr]
+		if ok {
+			return
+		}
+	}
+	return
+}
+
+// DialIP connects to the remote address raddr on the network net,
+// which must be "ip", "ip4", or "ip6".
+func DialIP(netProto string, laddr, raddr *IPAddr) (c *IPConn, err os.Error) {
+	net, proto, err := splitNetProto(netProto)
+	if err != nil {
+		return
+	}
+	switch net {
+	case "ip", "ip4", "ip6":
+	default:
+		return nil, UnknownNetworkError(net)
+	}
+	if raddr == nil {
+		return nil, &OpError{"dial", "ip", nil, errMissingAddress}
+	}
+	fd, e := internetSocket(net, laddr.toAddr(), raddr.toAddr(), syscall.SOCK_RAW, proto, "dial", sockaddrToIP)
+	if e != nil {
+		return nil, e
+	}
+	return newIPConn(fd), nil
+}
+
+// ListenIP listens for incoming IP packets addressed to the
+// local address laddr.  The returned connection c's ReadFrom
+// and WriteTo methods can be used to receive and send IP
+// packets with per-packet addressing.
+func ListenIP(netProto string, laddr *IPAddr) (c *IPConn, err os.Error) {
+	net, proto, err := splitNetProto(netProto)
+	if err != nil {
+		return
+	}
+	switch net {
+	case "ip", "ip4", "ip6":
+	default:
+		return nil, UnknownNetworkError(net)
+	}
+	fd, e := internetSocket(net, laddr.toAddr(), nil, syscall.SOCK_RAW, proto, "dial", sockaddrToIP)
+	if e != nil {
+		return nil, e
+	}
+	return newIPConn(fd), nil
+}
+
+// BindToDevice binds an IPConn to a network interface.
+func (c *IPConn) BindToDevice(device string) os.Error {
+	if !c.ok() {
+		return os.EINVAL
+	}
+	c.fd.incref()
+	defer c.fd.decref()
+	return os.NewSyscallError("setsockopt", syscall.BindToDevice(c.fd.sysfd, device))
+}