82 lines
1.9 KiB
Go
82 lines
1.9 KiB
Go
package configuration
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import (
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"fmt"
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"net"
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)
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// QoL feature to try and detect the best NIC for hyp
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func getDefaultNIC() (*net.Interface, error) {
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ifaces, err := net.Interfaces()
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if err != nil {
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return nil, fmt.Errorf("failed to get network interfaces on this system: %v", err)
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}
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if len(ifaces) < 1 {
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return nil, fmt.Errorf("this system has no network interfaces: %v", err)
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}
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// Just pick one to start
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selectedIface := ifaces[0]
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filteredIfaces := make([]net.Interface, 0)
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// Check for ethernet addresses
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for _, iface := range ifaces {
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if len(iface.HardwareAddr) == 6 {
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selectedIface = iface
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filteredIfaces = append(filteredIfaces, iface)
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}
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}
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ifaces = filteredIfaces
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filteredIfaces = make([]net.Interface, 0)
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// Check for interfaces that are up and not loopbacks
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for _, iface := range ifaces {
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if iface.Flags&net.FlagUp != 0 && iface.Flags&net.FlagRunning != 0 && iface.Flags&net.FlagLoopback == 0 {
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selectedIface = iface
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filteredIfaces = append(filteredIfaces, iface)
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}
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}
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ifaces = filteredIfaces
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filteredIfaces = make([]net.Interface, 0)
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// Check for interfaces that have IPv4 addresses assigned
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for _, iface := range ifaces {
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addresses, err := iface.Addrs()
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if err != nil {
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continue
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}
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for _, address := range addresses {
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ip, _, err := net.ParseCIDR(address.String())
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if err != nil {
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continue
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}
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if ip.To4() != nil {
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selectedIface = iface
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filteredIfaces = append(filteredIfaces, iface)
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}
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}
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}
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ifaces = filteredIfaces
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filteredIfaces = nil
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// Check for interfaces that have non RFC1918 addresses assigned
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for _, iface := range ifaces {
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addresses, err := iface.Addrs()
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if err != nil {
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continue
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}
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for _, address := range addresses {
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ip, _, err := net.ParseCIDR(address.String())
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if err != nil {
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continue
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}
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if !ip.IsPrivate() {
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selectedIface = iface
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}
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}
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}
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return &selectedIface, nil // TBD
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}
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