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package config
import (
"fmt"
"net"
"strings"
"github.com/taktv6/tflow2/convert"
)
type Global struct {
LocalASN uint32
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RouterID uint32
Port uint16
LocalAddressList []net.IP
Listen bool
}
const BGPPORT = uint16(179)
func (g *Global) SetDefaultGlobalConfigValues() error {
if g.LocalAddressList == nil {
g.LocalAddressList = make([]net.IP, 0)
g.LocalAddressList = append(g.LocalAddressList, net.ParseIP("0.0.0.0"))
g.LocalAddressList = append(g.LocalAddressList, net.ParseIP("::"))
}
if g.RouterID == 0 {
rtrid, err := generateRouterID()
if err != nil {
return fmt.Errorf("Unable to determine router ID: %v", err)
}
g.RouterID = rtrid
}
if g.Port == 0 {
g.Port = BGPPORT
}
return nil
}
func generateRouterID() (uint32, error) {
addr, err := getLoopbackIP()
if err == nil {
return convert.Uint32b([]byte(addr)[12:16]), nil
}
return 0, fmt.Errorf("Unable to determine router id")
}
func getHighestIP() (net.IP, error) {
ifs, err := net.Interfaces()
if err != nil {
return nil, fmt.Errorf("Unable to ")
}
return _getHighestIP(ifs)
}
func _getHighestIP(ifs []net.Interface) (net.IP, error) {
candidates := make([]net.IP, 0)
for _, iface := range ifs {
addrs, err := iface.Addrs()
if err != nil {
return nil, fmt.Errorf("Unable to get interface addrs for %s: %v", iface.Name, err)
}
for _, addr := range addrs {
a := net.ParseIP(addr.String())
if addr.String() != "127.0.0.1" && a.To4() != nil {
candidates = append(candidates, a)
}
}
}
if len(candidates) == 0 {
return nil, fmt.Errorf("No IPv4 address found on any interface")
}
max := candidates[0]
for _, c := range candidates[1:] {
if addrIsGreater(c, max) {
max = c
}
}
return nil, fmt.Errorf("No non localhost IPv4 address found on interface lo")
}
func getLoopbackIP() (net.IP, error) {
iface, err := net.InterfaceByName("lo")
if err != nil {
return nil, fmt.Errorf("Unable to get interface lo: %v", err)
}
return _getLoopbackIP(iface)
}
func _getLoopbackIP(iface *net.Interface) (net.IP, error) {
addrs, err := iface.Addrs()
if err != nil {
return nil, fmt.Errorf("Unable to get interface addresses: %v", err)
}
candidates := make([]net.IP, 0)
for _, addr := range addrs {
a := net.ParseIP(strings.Split(addr.String(), "/")[0])
if a.String() != "127.0.0.1" && a.To4() != nil {
candidates = append(candidates, a)
}
}
if len(candidates) == 0 {
return nil, fmt.Errorf("No non localhost IPv4 address found on interface lo")
}
max := candidates[0]
for _, c := range candidates {
if addrIsGreater(c, max) {
max = c
}
}
return max, nil
}
func addrIsGreater(a net.IP, b net.IP) bool {
/*
* FIXME: Implement proper comparison
*/
if a.String() > b.String() {
return true
}
return false
}