@@ -15,12 +15,16 @@ func getListeningPortProcessCmdline(port uint32) (string, error) {
1515acceptFn := func (s * netstat.SockTabEntry )bool {
1616return s .LocalAddr != nil && uint32 (s .LocalAddr .Port )== port
1717}
18- tabs ,err := netstat .TCPSocks (acceptFn )
18+ tabs ,err4 := netstat .TCPSocks (acceptFn )
1919tabs6 ,err6 := netstat .TCP6Socks (acceptFn )
2020
21- // Only return the error if the other method found nothing.
22- if (err != nil && len (tabs6 )== 0 )|| (err6 != nil && len (tabs )== 0 ) {
23- return "" ,xerrors .Errorf ("inspect port %d: %w" ,port ,errors .Join (err ,err6 ))
21+ // In the common case, we want to check ipv4 listening addresses. If this
22+ // fails, we should return an error. We also need to check ipv6. The
23+ // assumption is, if we have an err4, and 0 ipv6 addresses listed, then we are
24+ // interested in the err4 (and vice versa). So return both errors (at least 1
25+ // is non-nil) if the other list is empty.
26+ if (err4 != nil && len (tabs6 )== 0 )|| (err6 != nil && len (tabs )== 0 ) {
27+ return "" ,xerrors .Errorf ("inspect port %d: %w" ,port ,errors .Join (err4 ,err6 ))
2428}
2529
2630var proc * netstat.Process