150 lines
3.1 KiB
Go
150 lines
3.1 KiB
Go
package main
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import (
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"net"
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"time"
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"strconv"
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)
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const (
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SocketReadTimeout = time.Second
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SocketWriteTimeout = time.Second
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)
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type ConnHost struct {
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/* Hold host specific details */
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HostName string
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HostPort string
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FwdPort string
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}
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func (host *ConnHost) Name() string {
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return host.HostName
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}
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func (host *ConnHost) Port() string {
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return host.FwdPort
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}
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func (host *ConnHost) RealPort() string {
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return host.HostPort
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}
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func (host *ConnHost) AddrStr() string {
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return host.Name()+":"+host.Port()
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}
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type ConnClient struct {
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/* Hold client specific details */
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ClientIp string
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ClientPort string
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}
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func (client *ConnClient) Ip() string {
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return client.ClientIp
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}
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func (client *ConnClient) Port() string {
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return client.ClientPort
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}
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func (client *ConnClient) AddrStr() string {
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return client.Ip()+":"+client.Port()
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}
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type GophorListener struct {
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/* Simple net.Listener wrapper that holds onto virtual
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* host information + generates GophorConn instances
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*/
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Listener net.Listener
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Host *ConnHost
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Root string
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}
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func BeginGophorListen(bindAddr, hostname, port, fwdPort, rootDir string) (*GophorListener, error) {
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gophorListener := new(GophorListener)
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gophorListener.Host = &ConnHost{ hostname, port, fwdPort }
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gophorListener.Root = rootDir
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var err error
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gophorListener.Listener, err = net.Listen("tcp", bindAddr+":"+port)
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if err != nil {
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return nil, err
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} else {
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return gophorListener, nil
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}
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}
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func (l *GophorListener) Accept() (*GophorConn, error) {
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conn, err := l.Listener.Accept()
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if err != nil {
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return nil, err
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}
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gophorConn := new(GophorConn)
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gophorConn.Conn = &DeadlineConn{ conn }
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/* Copy over listener host */
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gophorConn.Host = l.Host
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gophorConn.Root = l.Root
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/* Should always be ok as listener is type TCP (see above) */
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addr, _ := conn.RemoteAddr().(*net.TCPAddr)
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gophorConn.Client = &ConnClient{
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addr.IP.String(),
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strconv.Itoa(addr.Port),
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}
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return gophorConn, nil
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}
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type DeadlineConn struct {
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/* Simple wrapper to net.Conn that's sets deadlines
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* on each call to Read() / Write()
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*/
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conn net.Conn
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}
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func (c *DeadlineConn) Read(b []byte) (int, error) {
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/* Implements reader + updates deadline */
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c.conn.SetReadDeadline(time.Now().Add(SocketReadTimeout))
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return c.conn.Read(b)
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}
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func (c *DeadlineConn) Write(b []byte) (int, error) {
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/* Implements writer + updates deadline */
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c.conn.SetWriteDeadline(time.Now().Add(SocketWriteTimeout))
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return c.conn.Write(b)
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}
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func (c *DeadlineConn) Close() error {
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/* Implements closer */
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return c.conn.Close()
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}
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type GophorConn struct {
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/* Wrap DeadlineConn with other connection details */
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Conn *DeadlineConn
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Host *ConnHost
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Client *ConnClient
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Root string
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}
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func (c *GophorConn) Read(b []byte) (int, error) {
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return c.Conn.Read(b)
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}
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func (c *GophorConn) Write(b []byte) (int, error) {
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return c.Conn.Write(b)
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}
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func (c *GophorConn) Close() error {
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return c.Conn.Close()
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}
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func (c *GophorConn) RootDir() string {
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return c.Root
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}
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