Pull request: * all: move internal Go packages to internal/

Merge in DNS/adguard-home from 2234-move-to-internal to master

Squashed commit of the following:

commit d26a288cabeac86f9483fab307677b1027c78524
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Fri Oct 30 12:44:18 2020 +0300

    * all: move internal Go packages to internal/

    Closes #2234.

internal/dnsforward/access_test.go

@@ -0,0 +1,73 @@
+package dnsforward
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIsBlockedIPAllowed(t *testing.T) {
+	a := &accessCtx{}
+	assert.True(t, a.Init([]string{"1.1.1.1", "2.2.0.0/16"}, nil, nil) == nil)
+
+	disallowed, disallowedRule := a.IsBlockedIP("1.1.1.1")
+	assert.False(t, disallowed)
+	assert.Equal(t, "", disallowedRule)
+
+	disallowed, disallowedRule = a.IsBlockedIP("1.1.1.2")
+	assert.True(t, disallowed)
+	assert.Equal(t, "", disallowedRule)
+
+	disallowed, disallowedRule = a.IsBlockedIP("2.2.1.1")
+	assert.False(t, disallowed)
+	assert.Equal(t, "", disallowedRule)
+
+	disallowed, disallowedRule = a.IsBlockedIP("2.3.1.1")
+	assert.True(t, disallowed)
+	assert.Equal(t, "", disallowedRule)
+}
+
+func TestIsBlockedIPDisallowed(t *testing.T) {
+	a := &accessCtx{}
+	assert.True(t, a.Init(nil, []string{"1.1.1.1", "2.2.0.0/16"}, nil) == nil)
+
+	disallowed, disallowedRule := a.IsBlockedIP("1.1.1.1")
+	assert.True(t, disallowed)
+	assert.Equal(t, "1.1.1.1", disallowedRule)
+
+	disallowed, disallowedRule = a.IsBlockedIP("1.1.1.2")
+	assert.False(t, disallowed)
+	assert.Equal(t, "", disallowedRule)
+
+	disallowed, disallowedRule = a.IsBlockedIP("2.2.1.1")
+	assert.True(t, disallowed)
+	assert.Equal(t, "2.2.0.0/16", disallowedRule)
+
+	disallowed, disallowedRule = a.IsBlockedIP("2.3.1.1")
+	assert.False(t, disallowed)
+	assert.Equal(t, "", disallowedRule)
+}
+
+func TestIsBlockedIPBlockedDomain(t *testing.T) {
+	a := &accessCtx{}
+	assert.True(t, a.Init(nil, nil, []string{"host1",
+		"host2",
+		"*.host.com",
+		"||host3.com^",
+	}) == nil)
+
+	// match by "host2.com"
+	assert.True(t, a.IsBlockedDomain("host1"))
+	assert.True(t, a.IsBlockedDomain("host2"))
+	assert.True(t, !a.IsBlockedDomain("host3"))
+
+	// match by wildcard "*.host.com"
+	assert.True(t, !a.IsBlockedDomain("host.com"))
+	assert.True(t, a.IsBlockedDomain("asdf.host.com"))
+	assert.True(t, a.IsBlockedDomain("qwer.asdf.host.com"))
+	assert.True(t, !a.IsBlockedDomain("asdf.zhost.com"))
+
+	// match by wildcard "||host3.com^"
+	assert.True(t, a.IsBlockedDomain("host3.com"))
+	assert.True(t, a.IsBlockedDomain("asdf.host3.com"))
+}