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conn.go
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conn.go
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package main
import (
"io"
"net"
"time"
)
// netConn is a dummy net.Conn that represents the nassh client dialing. It
// wraps a io.ReadWriteCloser for a net.Conn the SSH server can accept
type netConn struct {
cliReader io.ReadCloser
cliWriter io.WriteCloser
remoteAddr string
}
// Read reads data from the connection.
// Read can be made to time out and return an Error with Timeout() == true
// after a fixed time limit; see SetDeadline and SetReadDeadline.
func (n *netConn) Read(b []byte) (int, error) {
return n.cliReader.Read(b)
}
// Write writes data to the connection.
// Write can be made to time out and return an Error with Timeout() == true
// after a fixed time limit; see SetDeadline and SetWriteDeadline.
func (n *netConn) Write(b []byte) (int, error) {
return n.cliWriter.Write(b)
}
// Close closes the connection.
// Any blocked Read or Write operations will be unblocked and return errors.
func (n *netConn) Close() error {
if err := n.cliWriter.Close(); err != nil {
return err
}
return n.cliReader.Close()
}
// LocalAddr returns the local network address.
func (n *netConn) LocalAddr() net.Addr {
return &netaddr{"inprocess", "n/a"}
}
// RemoteAddr returns the remote network address.
func (n *netConn) RemoteAddr() net.Addr {
return &netaddr{"tcp", n.remoteAddr}
}
// SetDeadline sets the read and write deadlines associated
// with the connection. It is equivalent to calling both
// SetReadDeadline and SetWriteDeadline.
//
// A deadline is an absolute time after which I/O operations
// fail with a timeout (see type Error) instead of
// blocking. The deadline applies to all future and pending
// I/O, not just the immediately following call to Read or
// Write. After a deadline has been exceeded, the connection
// can be refreshed by setting a deadline in the future.
//
// An idle timeout can be implemented by repeatedly extending
// the deadline after successful Read or Write calls.
//
// A zero value for t means I/O operations will not time out.
func (n *netConn) SetDeadline(t time.Time) error {
return nil // TODO
}
// SetReadDeadline sets the deadline for future Read calls
// and any currently-blocked Read call.
// A zero value for t means Read will not time out.
func (n *netConn) SetReadDeadline(t time.Time) error {
return nil // TODO
}
// SetWriteDeadline sets the deadline for future Write calls
// and any currently-blocked Write call.
// Even if write times out, it may return n > 0, indicating that
// some of the data was successfully written.
// A zero value for t means Write will not time out.
func (n *netConn) SetWriteDeadline(t time.Time) error {
return nil // TODO
}
type netaddr struct {
network string
addr string
}
func (a *netaddr) Network() string {
return a.network
}
func (a *netaddr) String() string {
return a.addr
}
type pipeRWC struct {
cliReader io.ReadCloser
cliWriter io.WriteCloser
}
func (p *pipeRWC) Read(b []byte) (int, error) {
return p.cliReader.Read(b)
}
func (p *pipeRWC) Write(b []byte) (int, error) {
return p.cliWriter.Write(b)
}
func (p *pipeRWC) Close() error {
if err := p.cliWriter.Close(); err != nil {
return err
}
return p.cliReader.Close()
}