avoid panic

1 files changed, 8 insertions, 0 deletions

diff --git a/dialer.go b/dialer.go
index f38586d..402ac7e 100644
--- a/dialer.go
+++ b/dialer.go
@@ -3,6 +3,7 @@ package obfsvpn
 import (
 	"context"
 	"encoding/base64"
+	"errors"
 	"fmt"
 	"net"
 	"strconv"
@@ -24,6 +25,10 @@ const (
 	certLength = ntor.NodeIDLength + ntor.PublicKeyLength
 )
 
+var (
+	ErrCannotDial = errors.New("cannot dial")
+)
+
 // IATMode determines the amount of time sent between packets.
 type IATMode int
 
@@ -137,6 +142,9 @@ func (d *Dialer) Dial(network, address string) (net.Conn, error) {
 	ctx := context.Background()
 	return d.dial(ctx, network, address, func(network, address string) (net.Conn, error) {
 		conn, err := d.Dialer.DialContext(ctx, network, address)
+		if err != nil {
+			return nil, fmt.Errorf("%w: %s", ErrCannotDial, err)
+		}
 		return conn.(*net.TCPConn), err
 	})
 }