46 lines
1.1 KiB
Go
46 lines
1.1 KiB
Go
package deconnector
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import (
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"bufio"
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"fmt"
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"io"
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"net"
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"net/http"
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"net/url"
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)
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func (d *Deconnector) handleTunnel(clientConn net.Conn, host string, upstreamURL *url.URL) {
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d.app.Logger().WithField("host", host).Info("Handling CONNECT tunnel")
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upstreamConn, err := d.dialer.Dial()
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if err != nil {
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d.app.Logger().WithError(err).Error("upstream dial failed")
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fmt.Fprintf(clientConn, "HTTP/1.1 502 Bad Gateway\r\n\r\n")
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return
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}
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defer upstreamConn.Close()
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connectLine := fmt.Sprintf(
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"CONNECT %s HTTP/1.1\r\nHost: %s\r\n\r\n", host, host,
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)
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fmt.Fprint(upstreamConn, connectLine)
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resp, err := http.ReadResponse(bufio.NewReader(upstreamConn), nil)
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if err != nil || resp.StatusCode > 499 {
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d.app.Logger().WithError(err).Error("upstream CONNECT failed")
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fmt.Fprintf(clientConn, "HTTP/1.1 502 Bad Gateway\r\n\r\n")
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return
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}
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fmt.Fprintf(clientConn, "HTTP/1.1 200 Connection established\r\n\r\n")
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done := make(chan struct{}, 2)
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go func() { io.Copy(upstreamConn, clientConn); done <- struct{}{} }()
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go func() { io.Copy(clientConn, upstreamConn); done <- struct{}{} }()
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<-done
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}
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