package dpi import ( "encoding/hex" "strings" "testing" ) func TestDecodeTLSClientHello(t *testing.T) { // Taken from a random PCAP on the internet clientHelloBytes, err := testDecodeHexString(` 1603 0100 c801 0000 c403 03ec 12dd 1764 a439 fd7e 8c85 46b8 4d1e a06e b3d7 a051 f03c b817 470d 4c54 c5df 7200 001c eaea c02b c02f c02c c030 cca9 cca8 c013 c014 009c 009d 002f 0035 000a 0100 007f dada 0000 ff01 0001 0000 0000 1600 1400 0011 7777 772e 7769 6b69 7065 6469 612e 6f72 6700 1700 0000 2300 0000 0d00 1400 1204 0308 0404 0105 0308 0505 0108 0606 0102 0100 0500 0501 0000 0000 0012 0000 0010 000e 000c 0268 3208 6874 7470 2f31 2e31 7550 0000 000b 0002 0100 000a 000a 0008 1a1a 001d 0017 0018 1a1a 0001 00 `) if err != nil { t.Fatalf("failed to decode test ClientHello: %s", err) } // Taken from RFC8443 TLS 1.3 traces example: rfc8443ClientHelloBytes, err := testDecodeHexString(` 16 03 01 00 c4 01 00 00 c0 03 03 cb 34 ec b1 e7 81 63 ba 1c 38 c6 da cb 19 6a 6d ff a2 1a 8d 99 12 ec 18 a2 ef 62 83 02 4d ec e7 00 00 06 13 01 13 03 13 02 01 00 00 91 00 00 00 0b 00 09 00 00 06 73 65 72 76 65 72 ff 01 00 01 00 00 0a 00 14 00 12 00 1d 00 17 00 18 00 19 01 00 01 01 01 02 01 03 01 04 00 23 00 00 00 33 00 26 00 24 00 1d 00 20 99 38 1d e5 60 e4 bd 43 d2 3d 8e 43 5a 7d ba fe b3 c0 6e 51 c1 3c ae 4d 54 13 69 1e 52 9a af 2c 00 2b 00 03 02 03 04 00 0d 00 20 00 1e 04 03 05 03 06 03 02 03 08 04 08 05 08 06 04 01 05 01 06 01 02 01 04 02 05 02 06 02 02 02 00 2d 00 02 01 01 00 1c 00 02 40 01 `) if err != nil { t.Fatalf("failed to decode test ClientHello: %s", err) } t.Run("Client Hello", func(t *testing.T) { hello, err := DecodeTLSClientHelloHandshake(clientHelloBytes) if err != nil { t.Fatal(err) return } hello.Raw = nil t.Logf("%#v", hello) }) t.Run("TLS 1.3 Client Hello", func(t *testing.T) { hello, err := DecodeTLSClientHelloHandshake(rfc8443ClientHelloBytes) if err != nil { t.Fatal(err) return } hello.Raw = nil t.Logf("%#v", hello) }) } func TestDecodeTLSServerHello(t *testing.T) { serverHelloBytes, err := hex.DecodeString("02000030030300000000000000000000000000000000000000000000000000000000000000000000000000080005000000050000") if err != nil { t.Fatalf("failed to decode test ServerHello: %s", err) } t.Run("Server Hello", func(t *testing.T) { hello, err := DecodeTLSServerHello(serverHelloBytes) if err != nil { t.Fatal(err) return } t.Logf("%#+v", hello) }) } func testDecodeHexString(s string) ([]byte, error) { s = strings.TrimSpace(s) s = strings.ReplaceAll(s, " ", "") s = strings.ReplaceAll(s, "\n", "") s = strings.ReplaceAll(s, "\t", "") return hex.DecodeString(s) }