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package dhcpv4
import (
"net"
"testing"
"github.com/stretchr/testify/require"
)
func TestOptDomainNameServerInterfaceMethods(t *testing.T) {
servers := []net.IP{
net.IPv4(192, 168, 0, 10),
net.IPv4(192, 168, 0, 20),
}
o := OptDomainNameServer{NameServers: servers}
require.Equal(t, OptionDomainNameServer, o.Code(), "Code")
require.Equal(t, net.IPv4len*len(servers), o.Length(), "Length")
require.Equal(t, servers, o.NameServers, "NameServers")
}
func TestParseOptDomainNameServer(t *testing.T) {
data := []byte{
byte(OptionDomainNameServer),
8, // Length
192, 168, 0, 10, // DNS #1
192, 168, 0, 20, // DNS #2
}
o, err := ParseOptDomainNameServer(data)
require.NoError(t, err)
servers := []net.IP{
net.IPv4(192, 168, 0, 10),
net.IPv4(192, 168, 0, 20),
}
require.Equal(t, &OptDomainNameServer{NameServers: servers}, o)
// Short byte stream
data = []byte{byte(OptionDomainNameServer)}
_, err = ParseOptDomainNameServer(data)
require.Error(t, err, "should get error from short byte stream")
// Wrong code
data = []byte{54, 2, 1, 1}
_, err = ParseOptDomainNameServer(data)
require.Error(t, err, "should get error from wrong code")
// Bad length
data = []byte{byte(OptionDomainNameServer), 6, 1, 1, 1}
_, err = ParseOptDomainNameServer(data)
require.Error(t, err, "should get error from bad length")
}
func TestParseOptDomainNameServerNoServers(t *testing.T) {
// RFC2132 requires that at least one DNS server IP is specified
data := []byte{
byte(OptionDomainNameServer),
0, // Length
}
_, err := ParseOptDomainNameServer(data)
require.Error(t, err)
}
func TestOptDomainNameServerString(t *testing.T) {
o := OptDomainNameServer{NameServers: []net.IP{net.IPv4(192, 168, 0, 1), net.IPv4(192, 168, 0, 10)}}
require.Equal(t, "Domain Name Servers -> 192.168.0.1, 192.168.0.10", o.String())
}
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