APL: adjust error handling and tests (#1302)
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1630ffe2ca
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7318b01e11
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@ -781,6 +781,8 @@ func unpackDataAplPrefix(msg []byte, off int) (APLPrefix, int, error) {
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if off+afdlen > len(msg) {
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return APLPrefix{}, len(msg), &Error{err: "overflow unpacking APL address"}
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}
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// Address MUST NOT contain trailing zero bytes per RFC3123 Sections 4.1 and 4.2.
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off += copy(ip, msg[off:off+afdlen])
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if afdlen > 0 {
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last := ip[afdlen-1]
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@ -792,10 +794,6 @@ func unpackDataAplPrefix(msg []byte, off int) (APLPrefix, int, error) {
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IP: ip,
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Mask: net.CIDRMask(int(prefix), 8*len(ip)),
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}
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network := ipnet.IP.Mask(ipnet.Mask)
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if !network.Equal(ipnet.IP) {
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return APLPrefix{}, len(msg), &Error{err: "invalid APL address length"}
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}
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return APLPrefix{
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Negation: (nlen & 0x80) != 0,
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@ -391,34 +391,42 @@ func TestUnpackDataAplPrefix_Errors(t *testing.T) {
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tests := []struct {
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name string
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wire []byte
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want string
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}{
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{
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"incomplete header",
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[]byte{0x00, 0x01, 0x18},
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"dns: overflow unpacking APL prefix",
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},
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{
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"unrecognized family",
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[]byte{0x00, 0x03, 0x00, 0x00},
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"dns: unrecognized APL address family",
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},
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{
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"prefix length exceeded",
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"prefix too large for family IPv4",
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[]byte{0x00, 0x01, 0x21, 0x04, 192, 0, 2, 0},
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"dns: APL prefix too long",
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},
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{
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"address with extra byte",
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[]byte{0x00, 0x01, 0x10, 0x03, 192, 0, 2},
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"prefix too large for family IPv6",
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[]byte{0x00, 0x02, 0x81, 0x85, 0x20, 0x01, 0x0d, 0xb8, 0x80},
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"dns: APL prefix too long",
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},
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{
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"incomplete buffer",
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[]byte{0x00, 0x01, 0x10, 0x02, 192},
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},
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{
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"extra bits set",
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[]byte{0x00, 0x01, 22, 0x03, 192, 0, 2},
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},
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{
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"afdlen invalid",
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"afdlen too long for address family IPv4",
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[]byte{0x00, 0x01, 22, 0x05, 192, 0, 2, 0, 0},
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"dns: APL length too long",
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},
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{
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"overflow unpacking APL address",
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[]byte{0x00, 0x01, 0x10, 0x02, 192},
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"dns: overflow unpacking APL address",
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},
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{
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"address included trailing zeros",
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[]byte{0x00, 0x01, 0x10, 0x04, 192, 0, 2, 0},
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"dns: extra APL address bits",
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},
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}
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for _, tt := range tests {
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@ -427,6 +435,10 @@ func TestUnpackDataAplPrefix_Errors(t *testing.T) {
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if err == nil {
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t.Fatal("expected error, got none")
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}
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if err.Error() != tt.want {
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t.Errorf("expected %s, got %s", tt.want, err.Error())
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}
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})
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}
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}
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