cloudflared-mirror/connection/dial.go

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2019-11-21 18:10:44 +00:00
package connection
import (
"context"
"crypto/tls"
"net"
"time"
"github.com/pkg/errors"
)
// DialEdge makes a TLS connection to a Cloudflare edge node
func DialEdge(
ctx context.Context,
timeout time.Duration,
tlsConfig *tls.Config,
edgeTCPAddr *net.TCPAddr,
) (net.Conn, error) {
// Inherit from parent context so we can cancel (Ctrl-C) while dialing
dialCtx, dialCancel := context.WithTimeout(ctx, timeout)
defer dialCancel()
dialer := net.Dialer{}
edgeConn, err := dialer.DialContext(dialCtx, "tcp", edgeTCPAddr.String())
if err != nil {
return nil, newDialError(err, "DialContext error")
}
tlsEdgeConn := tls.Client(edgeConn, tlsConfig)
tlsEdgeConn.SetDeadline(time.Now().Add(timeout))
if err = tlsEdgeConn.Handshake(); err != nil {
return nil, newDialError(err, "TLS handshake with edge error")
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}
// clear the deadline on the conn; h2mux has its own timeouts
tlsEdgeConn.SetDeadline(time.Time{})
return tlsEdgeConn, nil
}
// DialError is an error returned from DialEdge
type DialError struct {
cause error
}
func newDialError(err error, message string) error {
return DialError{cause: errors.Wrap(err, message)}
}
func (e DialError) Error() string {
return e.cause.Error()
}
func (e DialError) Cause() error {
return e.cause
}