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Merge pull request #68116 from krmayankk/read-dns-code

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add validation for etc resolve parsing
This commit is contained in:
k8s-ci-robot 2018-09-25 14:40:32 -07:00 committed by GitHub
commit a3e30269dc
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3 changed files with 48 additions and 33 deletions
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1
pkg/kubelet/network/dns/BUILD
View File

@ -12,6 +12,7 @@ go_library(
"//pkg/kubelet/container:go_default_library",
"//pkg/kubelet/util/format:go_default_library",
"//staging/src/k8s.io/api/core/v1:go_default_library",
"//staging/src/k8s.io/apimachinery/pkg/util/errors:go_default_library",
"//staging/src/k8s.io/apiserver/pkg/util/feature:go_default_library",
"//staging/src/k8s.io/client-go/tools/record:go_default_library",
"//vendor/github.com/golang/glog:go_default_library",

12
pkg/kubelet/network/dns/dns.go
View File

@ -26,6 +26,7 @@ import (
"strings"
"k8s.io/api/core/v1"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
utilfeature "k8s.io/apiserver/pkg/util/feature"
"k8s.io/client-go/tools/record"
"k8s.io/kubernetes/pkg/apis/core/validation"
@ -209,6 +210,7 @@ func parseResolvConf(reader io.Reader) (nameservers []string, searches []string,
// Each option is recorded as an element in the array.
options = []string{}
var allErrors []error
lines := strings.Split(string(file), "\n")
for l := range lines {
trimmed := strings.TrimSpace(lines[l])
@ -219,8 +221,12 @@ func parseResolvConf(reader io.Reader) (nameservers []string, searches []string,
if len(fields) == 0 {
continue
}
if fields[0] == "nameserver" && len(fields) >= 2 {
nameservers = append(nameservers, fields[1])
if fields[0] == "nameserver" {
if len(fields) >= 2 {
nameservers = append(nameservers, fields[1])
} else {
allErrors = append(allErrors, fmt.Errorf("nameserver list is empty "))
}
}
if fields[0] == "search" {
searches = fields[1:]
@ -230,7 +236,7 @@ func parseResolvConf(reader io.Reader) (nameservers []string, searches []string,
}
}
return nameservers, searches, options, nil
return nameservers, searches, options, utilerrors.NewAggregate(allErrors)
}
func (c *Configurer) getHostDNSConfig(pod *v1.Pod) (*runtimeapi.DNSConfig, error) {

68
pkg/kubelet/network/dns/dns_test.go
View File

@ -53,40 +53,48 @@ func TestParseResolvConf(t *testing.T) {
nameservers []string
searches []string
options []string
isErr bool
}{
{"", []string{}, []string{}, []string{}},
{" ", []string{}, []string{}, []string{}},
{"\n", []string{}, []string{}, []string{}},
{"\t\n\t", []string{}, []string{}, []string{}},
{"#comment\n", []string{}, []string{}, []string{}},
{" #comment\n", []string{}, []string{}, []string{}},
{"#comment\n#comment", []string{}, []string{}, []string{}},
{"#comment\nnameserver", []string{}, []string{}, []string{}},
{"#comment\nnameserver\nsearch", []string{}, []string{}, []string{}},
{"nameserver 1.2.3.4", []string{"1.2.3.4"}, []string{}, []string{}},
{" nameserver 1.2.3.4", []string{"1.2.3.4"}, []string{}, []string{}},
{"\tnameserver 1.2.3.4", []string{"1.2.3.4"}, []string{}, []string{}},
{"nameserver\t1.2.3.4", []string{"1.2.3.4"}, []string{}, []string{}},
{"nameserver \t 1.2.3.4", []string{"1.2.3.4"}, []string{}, []string{}},
{"nameserver 1.2.3.4\nnameserver 5.6.7.8", []string{"1.2.3.4", "5.6.7.8"}, []string{}, []string{}},
{"nameserver 1.2.3.4 #comment", []string{"1.2.3.4"}, []string{}, []string{}},
{"search foo", []string{}, []string{"foo"}, []string{}},
{"search foo bar", []string{}, []string{"foo", "bar"}, []string{}},
{"search foo bar bat\n", []string{}, []string{"foo", "bar", "bat"}, []string{}},
{"search foo\nsearch bar", []string{}, []string{"bar"}, []string{}},
{"nameserver 1.2.3.4\nsearch foo bar", []string{"1.2.3.4"}, []string{"foo", "bar"}, []string{}},
{"nameserver 1.2.3.4\nsearch foo\nnameserver 5.6.7.8\nsearch bar", []string{"1.2.3.4", "5.6.7.8"}, []string{"bar"}, []string{}},
{"#comment\nnameserver 1.2.3.4\n#comment\nsearch foo\ncomment", []string{"1.2.3.4"}, []string{"foo"}, []string{}},
{"options ndots:5 attempts:2", []string{}, []string{}, []string{"ndots:5", "attempts:2"}},
{"options ndots:1\noptions ndots:5 attempts:3", []string{}, []string{}, []string{"ndots:5", "attempts:3"}},
{"nameserver 1.2.3.4\nsearch foo\nnameserver 5.6.7.8\nsearch bar\noptions ndots:5 attempts:4", []string{"1.2.3.4", "5.6.7.8"}, []string{"bar"}, []string{"ndots:5", "attempts:4"}},
{"", []string{}, []string{}, []string{}, false},
{" ", []string{}, []string{}, []string{}, false},
{"\n", []string{}, []string{}, []string{}, false},
{"\t\n\t", []string{}, []string{}, []string{}, false},
{"#comment\n", []string{}, []string{}, []string{}, false},
{" #comment\n", []string{}, []string{}, []string{}, false},
{"#comment\n#comment", []string{}, []string{}, []string{}, false},
{"#comment\nnameserver", []string{}, []string{}, []string{}, true}, // nameserver empty
{"#comment\nnameserver\nsearch", []string{}, []string{}, []string{}, true}, // nameserver and search empty
{"#comment\nnameserver 1.2.3.4\nsearch", []string{"1.2.3.4"}, []string{}, []string{}, false}, // nameserver specified and search empty
{"nameserver 1.2.3.4", []string{"1.2.3.4"}, []string{}, []string{}, false},
{" nameserver 1.2.3.4", []string{"1.2.3.4"}, []string{}, []string{}, false},
{"\tnameserver 1.2.3.4", []string{"1.2.3.4"}, []string{}, []string{}, false},
{"nameserver\t1.2.3.4", []string{"1.2.3.4"}, []string{}, []string{}, false},
{"nameserver \t 1.2.3.4", []string{"1.2.3.4"}, []string{}, []string{}, false},
{"nameserver 1.2.3.4\nnameserver 5.6.7.8", []string{"1.2.3.4", "5.6.7.8"}, []string{}, []string{}, false},
{"nameserver 1.2.3.4 #comment", []string{"1.2.3.4"}, []string{}, []string{}, false},
{"search ", []string{}, []string{}, []string{}, false}, // search empty
{"search foo", []string{}, []string{"foo"}, []string{}, false},
{"search foo bar", []string{}, []string{"foo", "bar"}, []string{}, false},
{"search foo bar bat\n", []string{}, []string{"foo", "bar", "bat"}, []string{}, false},
{"search foo\nsearch bar", []string{}, []string{"bar"}, []string{}, false},
{"nameserver 1.2.3.4\nsearch foo bar", []string{"1.2.3.4"}, []string{"foo", "bar"}, []string{}, false},
{"nameserver 1.2.3.4\nsearch foo\nnameserver 5.6.7.8\nsearch bar", []string{"1.2.3.4", "5.6.7.8"}, []string{"bar"}, []string{}, false},
{"#comment\nnameserver 1.2.3.4\n#comment\nsearch foo\ncomment", []string{"1.2.3.4"}, []string{"foo"}, []string{}, false},
{"options ", []string{}, []string{}, []string{}, false},
{"options ndots:5 attempts:2", []string{}, []string{}, []string{"ndots:5", "attempts:2"}, false},
{"options ndots:1\noptions ndots:5 attempts:3", []string{}, []string{}, []string{"ndots:5", "attempts:3"}, false},
{"nameserver 1.2.3.4\nsearch foo\nnameserver 5.6.7.8\nsearch bar\noptions ndots:5 attempts:4", []string{"1.2.3.4", "5.6.7.8"}, []string{"bar"}, []string{"ndots:5", "attempts:4"}, false},
}
for i, tc := range testCases {
ns, srch, opts, err := parseResolvConf(strings.NewReader(tc.data))
require.NoError(t, err)
assert.EqualValues(t, tc.nameservers, ns, "test case [%d]: name servers", i)
assert.EqualValues(t, tc.searches, srch, "test case [%d] searches", i)
assert.EqualValues(t, tc.options, opts, "test case [%d] options", i)
if !tc.isErr {
require.NoError(t, err)
assert.EqualValues(t, tc.nameservers, ns, "test case [%d]: name servers", i)
assert.EqualValues(t, tc.searches, srch, "test case [%d] searches", i)
assert.EqualValues(t, tc.options, opts, "test case [%d] options", i)
} else {
require.Error(t, err, "tc.searches %v", tc.searches)
}
}
}