Quit ebpf-dns if no uprobes are attached

evilsocket · Feb 10, 2022 · 11c363b · 11c363b
1 parent 8f89f98
commit 11c363b
Showing 1 changed file with 7 additions and 1 deletion.
diff --git a/daemon/dns/ebpfhook.go b/daemon/dns/ebpfhook.go
@@ -115,7 +115,7 @@ func DnsListenerEbpf() error {
 		log.Error("EBPF-DNS: Failed to open %s: %v", libcFile, err)
 		return err
 	}
-
+	probes_attached := 0
 	for uprobe := range m.IterUprobes() {
 		probeFunction := strings.Replace(uprobe.Name, "uretprobe/", "", 1)
 		probeFunction = strings.Replace(probeFunction, "uprobe/", "", 1)
@@ -129,6 +129,12 @@ func DnsListenerEbpf() error {
 			log.Error("EBPF-DNS: Failed to attach uprobe %s : %s\n", uprobe.Name, err)
 			return err
 		}
+		probes_attached++
+	}
+
+	if probes_attached == 0 {
+		log.Warning("EBPF-DNS: Failed to find symbols for uprobes.")
+		return errors.New("Failed to find symbols for uprobes.")
 	}
 
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