From c2047754c300b68c05d65faa8dc2925fe67b71b4 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@golang.org>
Date: Sat, 14 Jan 2017 00:05:42 +0000
Subject: libgo: update to Go 1.8 release candidate 1

    Compiler changes:
      * Change map assignment to use mapassign and assign value directly.
      * Change string iteration to use decoderune, faster for ASCII strings.
      * Change makeslice to take int, and use makeslice64 for larger values.
      * Add new noverflow field to hmap struct used for maps.

    Unresolved problems, to be fixed later:
      * Commented out test in go/types/sizes_test.go that doesn't compile.
      * Commented out reflect.TestStructOf test for padding after zero-sized field.

    Reviewed-on: https://go-review.googlesource.com/35231

gotools/:
	Updates for Go 1.8rc1.
	* Makefile.am (go_cmd_go_files): Add bug.go.
	(s-zdefaultcc): Write defaultPkgConfig.
	* Makefile.in: Rebuild.

From-SVN: r244456
---
 libgo/go/net/dnsconfig_unix_test.go | 83 +++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)

(limited to 'libgo/go/net/dnsconfig_unix_test.go')

diff --git a/libgo/go/net/dnsconfig_unix_test.go b/libgo/go/net/dnsconfig_unix_test.go
index 9fd6dbf..37bdeb0 100644
--- a/libgo/go/net/dnsconfig_unix_test.go
+++ b/libgo/go/net/dnsconfig_unix_test.go
@@ -10,6 +10,7 @@ import (
 	"errors"
 	"os"
 	"reflect"
+	"strings"
 	"testing"
 	"time"
 )
@@ -61,6 +62,36 @@ var dnsReadConfigTests = []struct {
 		},
 	},
 	{
+		name: "testdata/invalid-ndots-resolv.conf",
+		want: &dnsConfig{
+			servers:  defaultNS,
+			ndots:    0,
+			timeout:  5 * time.Second,
+			attempts: 2,
+			search:   []string{"domain.local."},
+		},
+	},
+	{
+		name: "testdata/large-ndots-resolv.conf",
+		want: &dnsConfig{
+			servers:  defaultNS,
+			ndots:    15,
+			timeout:  5 * time.Second,
+			attempts: 2,
+			search:   []string{"domain.local."},
+		},
+	},
+	{
+		name: "testdata/negative-ndots-resolv.conf",
+		want: &dnsConfig{
+			servers:  defaultNS,
+			ndots:    0,
+			timeout:  5 * time.Second,
+			attempts: 2,
+			search:   []string{"domain.local."},
+		},
+	},
+	{
 		name: "testdata/openbsd-resolv.conf",
 		want: &dnsConfig{
 			ndots:    1,
@@ -154,3 +185,55 @@ func TestDNSDefaultSearch(t *testing.T) {
 		}
 	}
 }
+
+func TestDNSNameLength(t *testing.T) {
+	origGetHostname := getHostname
+	defer func() { getHostname = origGetHostname }()
+	getHostname = func() (string, error) { return "host.domain.local", nil }
+
+	var char63 = ""
+	for i := 0; i < 63; i++ {
+		char63 += "a"
+	}
+	longDomain := strings.Repeat(char63+".", 5) + "example"
+
+	for _, tt := range dnsReadConfigTests {
+		conf := dnsReadConfig(tt.name)
+		if conf.err != nil {
+			t.Fatal(conf.err)
+		}
+
+		var shortestSuffix int
+		for _, suffix := range tt.want.search {
+			if shortestSuffix == 0 || len(suffix) < shortestSuffix {
+				shortestSuffix = len(suffix)
+			}
+		}
+
+		// Test a name that will be maximally long when prefixing the shortest
+		// suffix (accounting for the intervening dot).
+		longName := longDomain[len(longDomain)-254+1+shortestSuffix:]
+		if longName[0] == '.' || longName[1] == '.' {
+			longName = "aa." + longName[3:]
+		}
+		for _, fqdn := range conf.nameList(longName) {
+			if len(fqdn) > 254 {
+				t.Errorf("got %d; want less than or equal to 254", len(fqdn))
+			}
+		}
+
+		// Now test a name that's too long for suffixing.
+		unsuffixable := "a." + longName[1:]
+		unsuffixableResults := conf.nameList(unsuffixable)
+		if len(unsuffixableResults) != 1 {
+			t.Errorf("suffixed names %v; want []", unsuffixableResults[1:])
+		}
+
+		// Now test a name that's too long for DNS.
+		tooLong := "a." + longDomain
+		tooLongResults := conf.nameList(tooLong)
+		if tooLongResults != nil {
+			t.Errorf("suffixed names %v; want nil", tooLongResults)
+		}
+	}
+}
-- 
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