fix: filter lookback interface for utils.ClientIP (#700)
diff --git a/internal/utils/net.go b/internal/utils/net.go
index 0dfcff8..cf35594 100644
--- a/internal/utils/net.go
+++ b/internal/utils/net.go
@@ -40,14 +40,19 @@
}
func ClientIP4() ([]byte, error) {
- addrs, err := net.InterfaceAddrs()
- if err != nil {
- return nil, errors.New("unexpected IP address")
- }
- for _, addr := range addrs {
- if ipnet, ok := addr.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
- if ip4 := ipnet.IP.To4(); ip4 != nil {
- return ip4, nil
+ if ifaces, err := net.Interfaces(); err == nil && ifaces != nil {
+ for _, iface := range ifaces {
+ if iface.Flags&net.FlagLoopback != 0 || iface.Flags&net.FlagUp == 0 {
+ continue
+ }
+ if addrs, err := iface.Addrs(); err == nil && addrs != nil {
+ for _, addr := range addrs {
+ if ipnet, ok := addr.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
+ if ip4 := ipnet.IP.To4(); ip4 != nil {
+ return ip4, nil
+ }
+ }
+ }
}
}
}
