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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build !plan9
package net
import "testing"
// forceGoDNS forces the resolver configuration to use the pure Go resolver
// and returns a fixup function to restore the old settings.
func forceGoDNS() func() {
c := systemConf()
oldGo := c.netGo
oldCgo := c.netCgo
fixup := func() {
c.netGo = oldGo
c.netCgo = oldCgo
}
c.netGo = true
c.netCgo = false
return fixup
}
// forceCgoDNS forces the resolver configuration to use the cgo resolver
// and returns a fixup function to restore the old settings.
// (On non-Unix systems forceCgoDNS returns nil.)
func forceCgoDNS() func() {
c := systemConf()
oldGo := c.netGo
oldCgo := c.netCgo
fixup := func() {
c.netGo = oldGo
c.netCgo = oldCgo
}
c.netGo = false
c.netCgo = true
return fixup
}
func TestForceCgoDNS(t *testing.T) {
if !cgoAvailable {
t.Skip("cgo resolver not available")
}
defer forceCgoDNS()()
order, _ := systemConf().hostLookupOrder(nil, "go.dev")
if order != hostLookupCgo {
t.Fatalf("hostLookupOrder returned: %v, want cgo", order)
}
}
func TestForceGoDNS(t *testing.T) {
defer forceGoDNS()()
order, _ := systemConf().hostLookupOrder(nil, "go.dev")
if order == hostLookupCgo {
t.Fatalf("hostLookupOrder returned: %v, want go resolver order", order)
}
}