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Zakk
a6c2d5f1d2
On Linux the module's upstream, bootstrap and health-check sockets carry SO_MARK 0x80, which the transparent-proxy rules exempt. Windows and macOS have no mark: once a TUN holds the default route, those sockets would send the module's own queries into the TUN, where the core's port-53 interception hands them straight back to the module. The module config gains egress_interface; when set, every dialer created by newMarkedDnsClient binds to it with IP_UNICAST_IF / IPV6_UNICAST_IF on Windows and IP_BOUND_IF / IPV6_BOUND_IF on macOS. Unset, the dialers are unchanged, and Linux keeps the mark. The darwin and windows tests dial through the dialer and read the option back; they run on those platforms. The interface lookup itself is tested everywhere.
55 lines
1.3 KiB
Go
55 lines
1.3 KiB
Go
//go:build windows
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package dns
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import (
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"encoding/binary"
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"net"
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"syscall"
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"testing"
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"unsafe"
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"golang.org/x/sys/windows"
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)
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// The dialer's sockets must carry IP_UNICAST_IF for the configured
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// interface and nothing when none is configured.
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func TestMarkedDialerBindsEgressInterface(t *testing.T) {
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t.Cleanup(func() { SetEgressInterface("") })
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pc, err := net.ListenPacket("udp4", "127.0.0.1:0")
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if err != nil {
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t.Fatal(err)
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}
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defer pc.Close()
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boundIf := func() int {
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conn, err := markedDialer().Dial("udp4", pc.LocalAddr().String())
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if err != nil {
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t.Fatal(err)
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}
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defer conn.Close()
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raw, err := conn.(*net.UDPConn).SyscallConn()
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if err != nil {
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t.Fatal(err)
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}
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// The option is set in network byte order, but getsockopt hands
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// the index back in host order.
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var buf [4]byte
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raw.Control(func(fd uintptr) {
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n := int32(len(buf))
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_ = windows.Getsockopt(windows.Handle(fd), syscall.IPPROTO_IP, ipUnicastIf, (*byte)(unsafe.Pointer(&buf[0])), &n)
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})
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return int(binary.LittleEndian.Uint32(buf[:]))
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}
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SetEgressInterface("")
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if idx := boundIf(); idx != 0 {
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t.Fatalf("unconfigured dialer bound to interface %d", idx)
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}
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lo := loopbackInterface(t)
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SetEgressInterface(lo.Name)
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if idx := boundIf(); idx != lo.Index {
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t.Fatalf("bound to %d, want %d", idx, lo.Index)
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}
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}
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