Initial commit.

Network Detection.go

@@ -0,0 +1,71 @@
+/*
+File Name:  Network Detection.go
+Copyright:  2021 Peernet Foundation s.r.o.
+Author:     Peter Kleissner
+*/
+
+package core
+
+import "net"
+
+// FindInterfaceByIP finds an interface based on the IP. The IP must be available at the interface.
+func FindInterfaceByIP(ip net.IP) (iface *net.Interface, ipnet *net.IPNet) {
+	interfaceList, err := net.Interfaces()
+	if err != nil {
+		return nil, nil
+	}
+
+	// iterate through all interfaces
+	for _, ifaceSingle := range interfaceList {
+		addresses, err := ifaceSingle.Addrs()
+		if err != nil {
+			continue
+		}
+
+		// iterate through all IPs of the interfaces
+		for _, address := range addresses {
+			addressIP := address.(*net.IPNet).IP
+
+			if addressIP.Equal(ip) {
+				return &ifaceSingle, address.(*net.IPNet)
+			}
+		}
+	}
+
+	return nil, nil
+}
+
+// NetworkListIPs returns a list of all IPs
+func NetworkListIPs() (IPs []net.IP, err error) {
+
+	interfaceList, err := net.Interfaces()
+	if err != nil {
+		return nil, err
+	}
+
+	// iterate through all interfaces
+	for _, ifaceSingle := range interfaceList {
+		addresses, err := ifaceSingle.Addrs()
+		if err != nil {
+			continue
+		}
+
+		// iterate through all IPs of the interfaces
+		for _, address := range addresses {
+			addressIP := address.(*net.IPNet).IP
+			IPs = append(IPs, addressIP)
+		}
+	}
+
+	return IPs, nil
+}
+
+// IsIPv4 checks if an IP address is IPv4
+func IsIPv4(IP net.IP) bool {
+	return IP.To4() != nil
+}
+
+// IsIPv6 checks if an IP address is IPv6
+func IsIPv6(IP net.IP) bool {
+	return IP.To4() == nil && IP.To16() != nil
+}