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796c5ad42d
transport/ssh: update go-netssh to new version
=> supports CloseWrite and Deadlines
=> build: require Go 1.11 (netssh requires it)
48 lines
1.6 KiB
Go
48 lines
1.6 KiB
Go
package tls
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import (
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"crypto/tls"
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"fmt"
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"net"
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"os"
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)
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// adapts a tls.Conn and its underlying net.TCPConn into a valid transport.Wire
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type transportWireAdaptor struct {
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*tls.Conn
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tcpConn *net.TCPConn
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}
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func newWireAdaptor(tlsConn *tls.Conn, tcpConn *net.TCPConn) transportWireAdaptor {
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return transportWireAdaptor{tlsConn, tcpConn}
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}
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// CloseWrite implements transport.Wire.CloseWrite which is different from *tls.Conn.CloseWrite:
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// the former requires that the other side observes io.EOF, but *tls.Conn.CloseWrite does not
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// close the underlying connection so no io.EOF would be observed.
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func (w transportWireAdaptor) CloseWrite() error {
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if err := w.Conn.CloseWrite(); err != nil {
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// TODO log error
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fmt.Fprintf(os.Stderr, "transport/tls.CloseWrite() error: %s\n", err)
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}
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return w.tcpConn.CloseWrite()
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}
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// Close implements transport.Wire.Close which is different from a *tls.Conn.Close:
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// At the time of writing (Go 1.11), closing tls.Conn closes the TCP connection immediately,
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// which results in io.ErrUnexpectedEOF on the other side.
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// We assume that w.Conn has a deadline set for the close, so the CloseWrite will time out if it blocks,
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// falling through to the actual Close()
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func (w transportWireAdaptor) Close() error {
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// var buf [1<<15]byte
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// w.Conn.Write(buf[:])
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// CloseWrite will send a TLS alert record down the line which
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// in the Go implementation acts like a flush...?
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// if err := w.Conn.CloseWrite(); err != nil {
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// // TODO log error
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// fmt.Fprintf(os.Stderr, "transport/tls.Close() close write error: %s\n", err)
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// }
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// time.Sleep(1 * time.Second)
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return w.Conn.Close()
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}
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