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ip_resolver.go
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/
ip_resolver.go
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package ip
import (
gonet "net"
bosherr "github.com/cloudfoundry/bosh-utils/errors"
)
type InterfaceToAddrsFunc func(string) ([]gonet.Addr, error)
func NetworkInterfaceToAddrsFunc(interfaceName string) ([]gonet.Addr, error) {
iface, err := gonet.InterfaceByName(interfaceName)
if err != nil {
return []gonet.Addr{}, bosherr.WrapErrorf(err, "Searching for '%s' interface", interfaceName)
}
return iface.Addrs()
}
type Resolver interface {
// GetPrimaryIPv4 always returns error unless IPNet is found for given interface
GetPrimaryIPv4(interfaceName string) (*gonet.IPNet, error)
}
type ipResolver struct {
ifaceToAddrsFunc InterfaceToAddrsFunc
}
func NewResolver(ifaceToAddrsFunc InterfaceToAddrsFunc) Resolver {
return ipResolver{ifaceToAddrsFunc: ifaceToAddrsFunc}
}
func (r ipResolver) GetPrimaryIPv4(interfaceName string) (*gonet.IPNet, error) {
addrs, err := r.ifaceToAddrsFunc(interfaceName)
if err != nil {
return nil, bosherr.WrapErrorf(err, "Looking up addresses for interface '%s'", interfaceName)
}
if len(addrs) == 0 {
return nil, bosherr.Errorf("No addresses found for interface '%s'", interfaceName)
}
for _, addr := range addrs {
ip, ok := addr.(*gonet.IPNet)
if !ok {
continue
}
// todo dual stack
if ip.IP.To4() != nil || ip.IP.IsGlobalUnicast() {
return ip, nil
}
}
return nil, bosherr.Errorf("Failed to find primary address for interface '%s'", interfaceName)
}