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package openstack
import (
"fmt"
"log"
"net"
"github.com/google/uuid"
"github.com/gophercloud/gophercloud"
"github.com/gophercloud/gophercloud/openstack/compute/v2/extensions/attachinterfaces"
"github.com/gophercloud/gophercloud/openstack/networking/v2/extensions/external"
"github.com/gophercloud/gophercloud/openstack/networking/v2/extensions/layer3/floatingips"
"github.com/gophercloud/gophercloud/openstack/networking/v2/networks"
"github.com/gophercloud/gophercloud/openstack/networking/v2/subnets"
"github.com/gophercloud/gophercloud/pagination"
)
// CheckFloatingIP gets a floating IP by its ID and checks if it is already
// associated with any internal interface.
// It returns floating IP if it can be used.
func CheckFloatingIP(client *gophercloud.ServiceClient, id string) (*floatingips.FloatingIP, error) {
floatingIP, err := floatingips.Get(client, id).Extract()
if err != nil {
return nil, err
}
if floatingIP.PortID != "" {
return nil, fmt.Errorf("provided floating IP '%s' is already associated with port '%s'",
id, floatingIP.PortID)
}
return floatingIP, nil
}
// FindFreeFloatingIP returns free unassociated floating IP.
// It will return first floating IP if there are many.
func FindFreeFloatingIP(client *gophercloud.ServiceClient) (*floatingips.FloatingIP, error) {
var freeFloatingIP *floatingips.FloatingIP
pager := floatingips.List(client, floatingips.ListOpts{
Status: "DOWN",
})
err := pager.EachPage(func(page pagination.Page) (bool, error) {
candidates, err := floatingips.ExtractFloatingIPs(page)
if err != nil {
return false, err // stop and throw error out
}
for _, candidate := range candidates {
if candidate.PortID != "" {
continue // this floating IP is associated with port, move to next in list
}
// Floating IP is able to be allocated.
freeFloatingIP = &candidate
return false, nil // stop iterating over pages
}
return true, nil // try the next page
})
if err != nil {
return nil, err
}
if freeFloatingIP == nil {
return nil, fmt.Errorf("no free floating IPs found")
}
return freeFloatingIP, nil
}
// GetInstancePortID returns internal port of the instance that can be used for
// the association of a floating IP.
// It will return an ID of a first port if there are many.
func GetInstancePortID(client *gophercloud.ServiceClient, id string, instance_float_net string) (string, error) {
selected_interface := 0
interfacesPage, err := attachinterfaces.List(client, id).AllPages()
if err != nil {
return "", err
}
interfaces, err := attachinterfaces.ExtractInterfaces(interfacesPage)
if err != nil {
return "", err
}
if len(interfaces) == 0 {
return "", fmt.Errorf("instance '%s' has no interfaces", id)
}
for i := 0; i < len(interfaces); i++ {
log.Printf("Instance interface: %v: %+v\n", i, interfaces[i])
if interfaces[i].NetID == instance_float_net {
log.Printf("Found preferred interface: %v\n", i)
selected_interface = i
log.Printf("Using interface value: %v", selected_interface)
}
}
return interfaces[selected_interface].PortID, nil
}
// CheckFloatingIPNetwork checks provided network reference and returns a valid
// Networking service ID.
func CheckFloatingIPNetwork(client *gophercloud.ServiceClient, networkRef string) (string, error) {
if _, err := uuid.Parse(networkRef); err != nil {
return GetFloatingIPNetworkIDByName(client, networkRef)
}
return networkRef, nil
}
// ExternalNetwork is a network with external router.
type ExternalNetwork struct {
networks.Network
external.NetworkExternalExt
}
// GetFloatingIPNetworkIDByName searches for the external network ID by the provided name.
func GetFloatingIPNetworkIDByName(client *gophercloud.ServiceClient, networkName string) (string, error) {
var externalNetworks []ExternalNetwork
allPages, err := networks.List(client, networks.ListOpts{
Name: networkName,
}).AllPages()
if err != nil {
return "", err
}
if err := networks.ExtractNetworksInto(allPages, &externalNetworks); err != nil {
return "", err
}
if len(externalNetworks) == 0 {
return "", fmt.Errorf("can't find external network %s", networkName)
}
// Check and return the first external network.
if !externalNetworks[0].External {
return "", fmt.Errorf("network %s is not external", networkName)
}
return externalNetworks[0].ID, nil
}
// DiscoverProvisioningNetwork finds the first network whose subnet matches the given network ranges.
func DiscoverProvisioningNetwork(client *gophercloud.ServiceClient, cidrs []string) (string, error) {
allPages, err := subnets.List(client, subnets.ListOpts{}).AllPages()
if err != nil {
return "", err
}
allSubnets, err := subnets.ExtractSubnets(allPages)
if err != nil {
return "", err
}
for _, subnet := range allSubnets {
_, tenantIPNet, err := net.ParseCIDR(subnet.CIDR)
if err != nil {
return "", err
}
for _, cidr := range cidrs {
_, candidateIPNet, err := net.ParseCIDR(cidr)
if err != nil {
return "", err
}
if containsNet(candidateIPNet, tenantIPNet) {
return subnet.NetworkID, nil
}
}
}
return "", fmt.Errorf("failed to discover a provisioning network")
}
// containsNet returns true whenever IPNet `a` contains IPNet `b`
func containsNet(a *net.IPNet, b *net.IPNet) bool {
aMask, _ := a.Mask.Size()
bMask, _ := b.Mask.Size()
return a.Contains(b.IP) && aMask <= bMask
}
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