make IP address available

R=rsc
DELTA=30  (30 added, 0 deleted, 0 changed)
OCL=30536
CL=30536

src/pkg/net/fd.go

@@ -436,3 +436,13 @@ func (fd *netFD) addr() string {
 	addr, err1 := sockaddrToString(sa);
 	return addr;
 }
+
+func (fd *netFD) remoteAddr() string {
+	sa, err := syscall.Getpeername(fd.fd);
+	if err != 0 {
+		return "";
+	}
+	// TODO(rsc): woud like to say err not err1 but 6g complains
+	addr, err1 := sockaddrToString(sa);
+	return addr;
+}

src/pkg/net/net.go

@@ -33,6 +33,12 @@ type Conn interface {
 	// Close closes the connection.
 	Close() os.Error;
 
+	// LocalAddr returns the local network address.
+	LocalAddr() string;
+
+	// RemoteAddr returns the remote network address.
+	RemoteAddr() string;
+
 	// For packet-based protocols such as UDP,
 	// ReadFrom reads the next packet from the network,
 	// returning the number of bytes read and the remote
@@ -318,6 +324,20 @@ type connBase struct {
 	raddr string;
 }
 
+func (c *connBase) LocalAddr() string {
+	if c == nil {
+		return ""
+	}
+	return c.fd.addr();
+}
+
+func (c *connBase) RemoteAddr() string {
+	if c == nil {
+		return ""
+	}
+	return c.fd.remoteAddr();
+}
+
 func (c *connBase) File() *os.File {
 	if c == nil {
 		return nil