config: Move some functions to util.go

default.go and serve.go has some functions which are not directly
related to its main role.
This commit moves those functions to util.go, a more suitable place.

Signed-off-by: Satoshi Fujimoto <satoshi.fujimoto7@gmail.com>

1 files changed, 76 insertions, 0 deletions

diff --git a/config/util.go b/config/util.go
index dfe60d6c..ce49ff63 100644
--- a/config/util.go
+++ b/config/util.go
@@ -40,6 +40,64 @@ func detectConfigFileType(path, def string) string {
 	}
 }
 
+// yaml is decoded as []interface{}
+// but toml is decoded as []map[string]interface{}.
+// currently, viper can't hide this difference.
+// handle the difference here.
+func extractArray(intf interface{}) ([]interface{}, error) {
+	if intf != nil {
+		list, ok := intf.([]interface{})
+		if ok {
+			return list, nil
+		}
+		l, ok := intf.([]map[string]interface{})
+		if !ok {
+			return nil, fmt.Errorf("invalid configuration: neither []interface{} nor []map[string]interface{}")
+		}
+		list = make([]interface{}, 0, len(l))
+		for _, m := range l {
+			list = append(list, m)
+		}
+		return list, nil
+	}
+	return nil, nil
+}
+
+func getIPv6LinkLocalAddress(ifname string) (string, error) {
+	ifi, err := net.InterfaceByName(ifname)
+	if err != nil {
+		return "", err
+	}
+	addrs, err := ifi.Addrs()
+	if err != nil {
+		return "", err
+	}
+	for _, addr := range addrs {
+		ip := addr.(*net.IPNet).IP
+		if ip.To4() == nil && ip.IsLinkLocalUnicast() {
+			return fmt.Sprintf("%s%%%s", ip.String(), ifname), nil
+		}
+	}
+	return "", fmt.Errorf("no ipv6 link local address for %s", ifname)
+}
+
+func isLocalLinkLocalAddress(ifindex int, addr net.IP) (bool, error) {
+	ifi, err := net.InterfaceByIndex(ifindex)
+	if err != nil {
+		return false, err
+	}
+	addrs, err := ifi.Addrs()
+	if err != nil {
+		return false, err
+	}
+	for _, a := range addrs {
+		if ip, _, _ := net.ParseCIDR(a.String()); addr.Equal(ip) {
+			return true, nil
+		}
+	}
+	return false, nil
+}
+
 func (b *BgpConfigSet) getPeerGroup(n string) (*PeerGroup, error) {
 	if n == "" {
 		return nil, nil
@@ -140,6 +198,24 @@ func (c AfiSafis) ToRfList() ([]bgp.RouteFamily, error) {
 	return rfs, nil
 }
 
+func inSlice(n Neighbor, b []Neighbor) int {
+	for i, nb := range b {
+		if nb.State.NeighborAddress == n.State.NeighborAddress {
+			return i
+		}
+	}
+	return -1
+}
+
+func existPeerGroup(n string, b []PeerGroup) int {
+	for i, nb := range b {
+		if nb.Config.PeerGroupName == n {
+			return i
+		}
+	}
+	return -1
+}
+
 func CheckAfiSafisChange(x, y []AfiSafi) bool {
 	if len(x) != len(y) {
 		return true