added more debug info to the dns ebpf hook

Added the path to the libc as well as the calculated offset for the
uprobe.
Don't return on the first error found loading a uprobe, instead try all
the uprobes and return if the loaded uprobes are 0.

daemon/dns/ebpfhook.go

@@ -123,13 +123,13 @@ func ListenerEbpf(ebpfModPath string) error {
 		probeFunction = strings.Replace(probeFunction, "uprobe/", "", 1)
 		offset, err := lookupSymbol(libcElf, probeFunction)
 		if err != nil {
-			log.Warning("EBPF-DNS: Failed to find symbol for uprobe %s : %s\n", uprobe.Name, err)
+			log.Warning("EBPF-DNS: Failed to find symbol for uprobe %s (offset: %d): %s\n", uprobe.Name, offset, err)
 			continue
 		}
 		err = bpf.AttachUprobe(uprobe, libcFile, offset)
 		if err != nil {
-			log.Error("EBPF-DNS: Failed to attach uprobe %s : %s\n", uprobe.Name, err)
-			return err
+			log.Warning("EBPF-DNS: Failed to attach uprobe %s : %s, (%s, %d)\n", uprobe.Name, err, libcFile, offset)
+			continue
 		}
 		probesAttached++
 	}