Log resolver address on error

2 files changed, 4 insertions, 2 deletions

diff --git a/dns/dnsutil/dnsutil.go b/dns/dnsutil/dnsutil.go
index 141f5c6..c7b52f0 100644
--- a/dns/dnsutil/dnsutil.go
+++ b/dns/dnsutil/dnsutil.go
@@ -2,6 +2,7 @@ package dnsutil
 
 import (
 	"errors"
+	"fmt"
 	"sync"
 	"time"
 
@@ -52,7 +53,7 @@ func (c *Client) Exchange(msg *dns.Msg) (*dns.Msg, error) {
 			defer wg.Done()
 			r, _, err1 := c.Exchanger.Exchange(msg, addr)
 			if err1 != nil {
-				err = err1
+				err = fmt.Errorf("resolver %s failed: %w", addr, err1)
 				return
 			}
 			ch <- r
diff --git a/dns/proxy.go b/dns/proxy.go
index 9daf552..58cdb47 100644
--- a/dns/proxy.go
+++ b/dns/proxy.go
@@ -39,6 +39,7 @@ type Proxy struct {
 }
 
 type logger interface {
+	Print(...interface{})
 	Printf(string, ...interface{})
 	Record(net.IP, bool, uint16, string, ...string)
 	Close() error
@@ -146,7 +147,7 @@ func (p *Proxy) ServeDNS(w dns.ResponseWriter, r *dns.Msg) {
 		p.writeMsg(w, rr, false)
 		p.cache.Set(key, rr)
 	} else {
-		p.logger.Printf("resolver(s) failed: %s", err)
+		p.logger.Print(err)
 		dns.HandleFailed(w, r)
 	}
 }