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//go:build windows
package netstate
import (
"errors"
"slices"
"strings"
"unsafe"
"golang.org/x/sys/windows"
"github.com/armanlife/firefox-vpn-client/core/internal/egress"
)
// connected looks for an adapter that is up and has a default gateway.
// Adapters without one, such as Hyper-V's vEthernet for WSL and Docker,
// stay up while Wi-Fi and Ethernet are disconnected and do not count.
func connected() bool {
list, err := adapters()
if err != nil {
return true
}
for _, a := range list {
if a.up && a.gateway && !a.loopback {
return true
}
}
return false
}
// current names the connected networks: each adapter that is up and has a
// default gateway, with its addresses and gateways.
func current() (string, bool) {
list, err := adapters()
if err != nil {
return "", false
}
var parts []string
for _, a := range list {
if a.up && a.gateway && !a.loopback {
parts = append(parts, a.name+"="+a.addresses)
}
}
slices.Sort(parts)
return strings.Join(parts, ";"), true
}
type adapter struct {
name string
up, gateway, loopback bool
// addresses are its own and its gateways' addresses.
addresses string
}
func adapters() ([]adapter, error) {
const flags = windows.GAA_FLAG_INCLUDE_GATEWAYS | windows.GAA_FLAG_SKIP_ANYCAST | windows.GAA_FLAG_SKIP_MULTICAST | windows.GAA_FLAG_SKIP_DNS_SERVER
size := uint32(16 << 10)
for range 3 {
buf := make([]byte, size)
first := (*windows.IpAdapterAddresses)(unsafe.Pointer(&buf[0]))
err := windows.GetAdaptersAddresses(windows.AF_UNSPEC, flags, 0, first, &size)
if errors.Is(err, windows.ERROR_BUFFER_OVERFLOW) {
continue
}
if err != nil {
return nil, err
}
_, tun, tunRuns := egress.Tun()
var list []adapter
for a := first; a != nil; a = a.Next {
if tunRuns && a.Luid == tun {
// The TUN mode's adapter has the default routes but is no
// network of its own.
continue
}
var addrs []string
for u := a.FirstUnicastAddress; u != nil; u = u.Next {
addrs = append(addrs, u.Address.IP().String())
}
for g := a.FirstGatewayAddress; g != nil; g = g.Next {
addrs = append(addrs, "gw "+g.Address.IP().String())
}
list = append(list, adapter{
name: windows.UTF16PtrToString(a.FriendlyName),
up: a.OperStatus == windows.IfOperStatusUp,
gateway: a.FirstGatewayAddress != nil,
loopback: a.IfType == windows.IF_TYPE_SOFTWARE_LOOPBACK,
addresses: strings.Join(addrs, ","),
})
}
return list, nil
}
return nil, windows.ERROR_BUFFER_OVERFLOW
}
arblant