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package dlog_test
import (
"bytes"
"encoding/binary"
"errors"
"io"
"io/ioutil"
"strings"
"testing"
"github.com/crowdsecurity/dlog"
)
func Test_tooShortForPrefix(t *testing.T) {
r := dlog.NewReader(strings.NewReader("123"))
_, err := ioutil.ReadAll(r)
if err == nil {
t.Fatal("expected error")
}
if !strings.HasPrefix(err.Error(), "dlog: corrupted prefix") {
t.Fatalf("unexpected error message: %v", err)
}
}
func Test_corruptPrefixInMiddle(t *testing.T) {
b := append(msg(1, []byte("Hi!")), []byte{0x1, 0x0, 0x0, 0x0}...)
r := dlog.NewReader(bytes.NewReader(b))
_, err := ioutil.ReadAll(r)
if err == nil {
t.Fatal("expected error")
}
if !strings.HasPrefix(err.Error(), "dlog: corrupted prefix") {
t.Fatalf("unexpected error message: %v", err)
}
}
func Test_prefixReadFailure(t *testing.T) {
r := dlog.NewReader(
io.MultiReader(
bytes.NewReader(msg(1, []byte("Hello!"))),
&badReader{}))
b, err := ioutil.ReadAll(r)
if err == nil {
t.Fatal("expected error")
}
if expected := "dlog: error reading prefix: phony error"; err.Error() != expected {
t.Fatalf("expected: %q got: %v", expected, err)
}
if expected := "Hello!"; string(b) != expected {
t.Fatalf("wrong partially read part. expeected %q got %q", expected, string(b))
}
}
func Test_unrecognizedStreamByte(t *testing.T) {
r := dlog.NewReader(bytes.NewReader([]byte{0x03, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}))
_, err := ioutil.ReadAll(r)
if err == nil {
t.Fatal("expected error")
}
if expected := "dlog: unexpected stream byte: 0x3"; err.Error() != expected {
t.Fatalf("expected error: %q got:%v", expected, err)
}
}
func Test_growsInitialBuffer(t *testing.T) {
m := bytes.Repeat([]byte{'A'}, 3000) // intiial buf 2048
r := dlog.NewReader(bytes.NewReader(msg(1, m)))
b, err := ioutil.ReadAll(r)
if err != nil {
t.Fatal(err)
}
if !same(m, b) {
t.Fatalf("wrong output: expected=(%d)%#v got=(%d)%#v", len(m), m, len(b), b)
}
}
func Test_messageLimit_atLimit(t *testing.T) {
b := append(msg(1, []byte("Hello!\n")),
msg(1, bytes.Repeat([]byte{'A'}, 65536))...) // large msg but allowed 64k
_, err := ioutil.ReadAll(dlog.NewReader(bytes.NewReader(b)))
if err != nil {
t.Fatal(err)
}
}
func Test_messageLimit_exceeds(t *testing.T) {
b := append(msg(1, []byte("hello\n")),
[]byte{0x1, 0x0, 0x0, 0x0 /* 65537 bytes */, 0x00, 0x01, 0x00, 0x01 /* rest must be ignored */, 0xff}...)
_, err := ioutil.ReadAll(dlog.NewReader(bytes.NewReader(b)))
if err == nil {
t.Fatal("expected error")
}
if expected := "parsed msg too large"; !strings.Contains(err.Error(), expected) {
t.Fatalf("expected %q got: %v", expected, err)
}
}
func Test_corruptMessage_missingBody(t *testing.T) {
b := []byte{0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05}
out, err := ioutil.ReadAll(dlog.NewReader(bytes.NewReader(b)))
if err == nil {
t.Fatal("expected error", out)
}
if expected := "dlog: corrupt message read 0 out of 5 bytes: EOF"; err.Error() != expected {
t.Fatalf("expected %q got: %v", expected, err)
}
}
func Test_corruptMessage_partialBody(t *testing.T) {
b := msg(1, []byte("helloworld"))
b = b[:len(b)-1] // cut off last byte
out, err := ioutil.ReadAll(dlog.NewReader(bytes.NewReader(b)))
if err == nil {
t.Fatal("expected error", out)
}
if expected := "dlog: corrupt message read 9 out of 10 bytes: unexpected EOF"; err.Error() != expected {
t.Fatalf("expected %q got: %v", expected, err)
}
}
func Test_messageReadFailure(t *testing.T) {
r := io.MultiReader(
bytes.NewReader([]byte{0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05}), // prefix for msg len=5
&badReader{})
out, err := ioutil.ReadAll(dlog.NewReader(r))
if err == nil {
t.Fatal("expected error", out)
}
if expected := "dlog: failed to read message: phony error"; err.Error() != expected {
t.Fatalf("expected %q got: %v", expected, err)
}
}
func Test_twoSmallMessages_parsedCorrectly(t *testing.T) {
b := append(msg(1, []byte("hello\n")), msg(2, []byte("world\n"))...)
out, err := ioutil.ReadAll(dlog.NewReader(bytes.NewReader(b)))
if err != nil {
t.Fatal(err)
}
if expected := "hello\nworld\n"; string(out) != expected {
t.Fatalf("wrong output: %q, expected: %q", string(out), expected)
}
}
func msg(fd int8, b []byte) []byte {
size := make([]byte, 4)
binary.BigEndian.PutUint32(size, uint32(len(b)))
v := []byte{byte(fd), 0x0, 0x0, 0x0}
return append(append(v, size...), b...)
}
type badReader struct{}
func (_ *badReader) Read(p []byte) (int, error) {
return 0, errors.New("phony error")
}
func same(a, b []byte) bool {
if len(a) != len(b) {
return false
}
for i := range a {
if a[i] != b[i] {
return false
}
}
return true
}
|
