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msg_helpers_test.go
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msg_helpers_test.go
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package dns
import "testing"
// TestPacketDataNsec tests generated using fuzz.go and with a message pack
// containing the following bytes: 0000\x00\x00000000\x00\x002000000\x0060000\x00\x130000000000000000000"
// That bytes sequence created the overflow error and further permutations of that sequence were able to trigger
// the other code paths.
func TestPackDataNsec(t *testing.T) {
type args struct {
bitmap []uint16
msg []byte
off int
}
tests := []struct {
name string
args args
want int
wantErr bool
wantErrMsg string
}{
{
name: "overflow",
args: args{
bitmap: []uint16{
8962, 8963, 8970, 8971, 8978, 8979,
8986, 8987, 8994, 8995, 9002, 9003,
9010, 9011, 9018, 9019, 9026, 9027,
9034, 9035, 9042, 9043, 9050, 9051,
9058, 9059, 9066,
},
msg: []byte{
48, 48, 48, 48, 0, 0, 0,
1, 0, 0, 0, 0, 0, 0, 50,
48, 48, 48, 48, 48, 48,
0, 54, 48, 48, 48, 48,
0, 19, 48, 48,
},
off: 48,
},
wantErr: true,
wantErrMsg: "dns: overflow packing nsec",
want: 31,
},
{
name: "disordered nsec bits",
args: args{
bitmap: []uint16{
8962,
0,
},
msg: []byte{
48, 48, 48, 48, 0, 0, 0, 1, 0, 0, 0, 0,
0, 0, 50, 48, 48, 48, 48, 48, 48, 0, 54, 48,
48, 48, 48, 0, 19, 48, 48, 48, 48, 48, 48, 0,
0, 0, 1, 0, 0, 0, 0, 0, 0, 50, 48, 48,
48, 48, 48, 48, 0, 54, 48, 48, 48, 48, 0, 19,
48, 48, 48, 48, 48, 48, 0, 0, 0, 1, 0, 0,
0, 0, 0, 0, 50, 48, 48, 48, 48, 48, 48, 0,
54, 48, 48, 48, 48, 0, 19, 48, 48, 48, 48, 48,
48, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 50,
48, 48, 48, 48, 48, 48, 0, 54, 48, 48, 48, 48,
0, 19, 48, 48, 48, 48, 48, 48, 0, 0, 0, 1,
0, 0, 0, 0, 0, 0, 50, 48, 48, 48, 48, 48,
48, 0, 54, 48, 48, 48, 48, 0, 19, 48, 48,
},
off: 0,
},
wantErr: true,
wantErrMsg: "dns: nsec bits out of order",
want: 155,
},
{
name: "simple message with only one window",
args: args{
bitmap: []uint16{
0,
},
msg: []byte{
48, 48, 48, 48, 0, 0,
0, 1, 0, 0, 0, 0,
0, 0, 50, 48, 48, 48,
48, 48, 48, 0, 54, 48,
48, 48, 48, 0, 19, 48, 48,
},
off: 0,
},
wantErr: false,
want: 3,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got, err := packDataNsec(tt.args.bitmap, tt.args.msg, tt.args.off)
if (err != nil) != tt.wantErr {
t.Errorf("packDataNsec() error = %v, wantErr %v", err, tt.wantErr)
return
}
if err != nil && tt.wantErrMsg != err.Error() {
t.Errorf("packDataNsec() error msg = %v, wantErrMsg %v", err.Error(), tt.wantErrMsg)
return
}
if got != tt.want {
t.Errorf("packDataNsec() = %v, want %v", got, tt.want)
}
})
}
}