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package libvirt
import (
"encoding/json"
"log"
"strings"
libvirt "github.com/dmacvicar/libvirt-go"
)
type QemuAgentInterfacesResponse struct {
Interfaces []QemuAgentInterface `json:"return"`
}
type QemuAgentInterface struct {
Name string `json:"name"`
Hwaddr string `json:"hardware-address"`
IpAddresses []struct {
Type string `json:"ip-address-type"`
Address string `json:"ip-address"`
Prefix uint `json:"prefix"`
} `json:"ip-addresses"`
}
// Retrieve all the interfaces attached to a domain and their addresses. Only
// the interfaces with at least an IP address are returned.
// When wait4ipv4 is turned on the code will not report interfaces that don't
// have a ipv4 address set. This is useful when a domain gets the ipv6 address
// before the ipv4 one.
func getDomainInterfacesViaQemuAgent(domain *libvirt.VirDomain, wait4ipv4 bool) []libvirt.VirDomainInterface {
log.Print("[DEBUG] get network interfaces using qemu agent")
var interfaces []libvirt.VirDomainInterface
result := domain.QemuAgentCommand(
"{\"execute\":\"guest-network-get-interfaces\"}",
libvirt.VIR_DOMAIN_QEMU_AGENT_COMMAND_DEFAULT,
0)
log.Printf("[DEBUG] qemu-agent response: %s", result)
response := QemuAgentInterfacesResponse{}
if err := json.Unmarshal([]byte(result), &response); err != nil {
log.Printf("[DEBUG] Error converting Qemu agent response about domain interfaces: %s", err)
log.Printf("[DEBUG] Original message: %s", response)
log.Print("[DEBUG] Returning an empty list of interfaces")
return interfaces
}
log.Printf("[DEBUG] Parsed response %+v", response)
for _, iface := range response.Interfaces {
if iface.Name == "lo" {
// ignore loopback interface
continue
}
libVirtIface := libvirt.VirDomainInterface{}
libVirtIface.Name = iface.Name
libVirtIface.Hwaddr = iface.Hwaddr
ipv4Assigned := false
for _, addr := range iface.IpAddresses {
if addr.Address == "" {
// ignore interfaces without an address (eg. waiting for dhcp lease)
continue
}
libVirtAddr := libvirt.VirDomainIPAddress{
Addr: addr.Address,
Prefix: addr.Prefix,
}
switch strings.ToLower(addr.Type) {
case "ipv4":
libVirtAddr.Type = libvirt.VIR_IP_ADDR_TYPE_IPV4
ipv4Assigned = true
case "ipv6":
libVirtAddr.Type = libvirt.VIR_IP_ADDR_TYPE_IPV6
default:
log.Printf("[ERROR] Cannot handle unknown address type %s", addr.Type)
}
libVirtIface.Addrs = append(libVirtIface.Addrs, libVirtAddr)
}
if len(libVirtIface.Addrs) > 0 && (ipv4Assigned || !wait4ipv4) {
interfaces = append(interfaces, libVirtIface)
}
}
log.Printf("[DEBUG] Interfaces obtained via qemu Agent: %+v", interfaces)
return interfaces
}
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