Improve procfs scanner

src/sniffer/pkg/utils/procfs.go

@@ -36,6 +36,31 @@ func ScanProcDirProcesses(callback ProcessScanCallback) error {
 }
 
 func ExtractProcessHostname(pDir string) (string, error) {
+	hostname, found, err := extractProcessHostnameUsingEtcHostname(pDir)
+	if err != nil {
+		return "", errors.Wrap(err)
+	}
+	if found {
+		return hostname, nil
+	}
+	return extractProcessHostnameUsingEnviron(pDir)
+
+}
+
+func extractProcessHostnameUsingEtcHostname(pDir string) (string, bool, error) {
+	// Read the environment variables from the proc filesystem
+	data, err := os.ReadFile(fmt.Sprintf("%s/root/etc/hostname", pDir))
+	if os.IsNotExist(err) {
+		return "", false, nil
+	}
+	if err != nil {
+		return "", false, errors.Wrap(err)
+	}
+
+	return strings.TrimSpace(string(data)), true, nil
+}
+
+func extractProcessHostnameUsingEnviron(pDir string) (string, error) {
 	// Read the environment variables from the proc filesystem
 	data, err := os.ReadFile(fmt.Sprintf("%s/environ", pDir))
 	if err != nil {
@@ -58,7 +83,6 @@ func ExtractProcessHostname(pDir string) (string, error) {
 	}
 
 	return "", errors.Errorf("couldn't find hostname in %s/environ", pDir)
-
 }
 
 func ExtractProcessIPAddr(pDir string) (string, error) {