What exactly does a ClientHello request look like in TLS?

Question

C++ / C#

I wrote a simple http client on sockets in C ()
Everything is fine, but sites redirect (301) to https.
Everything would be fine, I began to study TLS.
I also create a socket (TCP), connect to port 443.
But I still can't figure out exactly how the ClientHello request looks like.
For example, an http request looks like a string request with a certain pattern.
As for ClientHello, I don't understand what representation and format it should be in.
I know what needs to be sent (tls version, random, session, cipher suite), but how exactly it should look like (namely, the message passed to send( ) ) I can't figure out.
Tell me please.
There is practically no information on the Internet, I found options on openssl (I won’t use it, because I want to consider and study it from the technical side), somewhere else it was written that the request is presented in HEX, somewhere it’s just like a string.

Answer 1

https://tls.dxdt.ru/tls.html#logic

Answer 2

There is almost no information on the internet.

Once again he blew up over the lack of IT information on the Internet. C, then, mastered - but there is no Google skill?

Answer 3

TLSv1.3 Record Layer: Handshake Protocol: Client Hello
        Content Type: Handshake (22)
        Version: TLS 1.0 (0x0301)
        Length: 512
        Handshake Protocol: Client Hello
            Handshake Type: Client Hello (1)
            Length: 508
            Version: TLS 1.2 (0x0303)
            Random: c9c7ad6971a42b67dfa5ed3339dbbe1f7bc946f3e57d03fa...
            Session ID Length: 32
            Session ID: 23ea9700711540a7862b184b845f1d3cb780c6b99e1b1e18...
            Cipher Suites Length: 34
            Cipher Suites (17 suites)
                Cipher Suite: TLS_AES_128_GCM_SHA256 (0x1301)
                Cipher Suite: TLS_CHACHA20_POLY1305_SHA256 (0x1303)
                Cipher Suite: TLS_AES_256_GCM_SHA384 (0x1302)
                Cipher Suite: TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 (0xc02b)
                Cipher Suite: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (0xc02f)
                Cipher Suite: TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256 (0xcca9)
                Cipher Suite: TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 (0xcca8)
                Cipher Suite: TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 (0xc02c)
                Cipher Suite: TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (0xc030)
                Cipher Suite: TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA (0xc00a)
                Cipher Suite: TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA (0xc009)
                Cipher Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (0xc013)
                Cipher Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (0xc014)
                Cipher Suite: TLS_RSA_WITH_AES_128_GCM_SHA256 (0x009c)
                Cipher Suite: TLS_RSA_WITH_AES_256_GCM_SHA384 (0x009d)
                Cipher Suite: TLS_RSA_WITH_AES_128_CBC_SHA (0x002f)
                Cipher Suite: TLS_RSA_WITH_AES_256_CBC_SHA (0x0035)
            Compression Methods Length: 1
            Compression Methods (1 method)
                Compression Method: null (0)
            Extensions Length: 401
            Extension: server_name (len=17)
                Type: server_name (0)
                Length: 17
                Server Name Indication extension
                    Server Name list length: 15
                    Server Name Type: host_name (0)
                    Server Name length: 12
                    Server Name: www.babai.ru
            Extension: extended_master_secret (len=0)
                Type: extended_master_secret (23)
                Length: 0
            Extension: renegotiation_info (len=1)
                Type: renegotiation_info (65281)
                Length: 1
                Renegotiation Info extension
                    Renegotiation info extension length: 0
            Extension: supported_groups (len=14)
                Type: supported_groups (10)
                Length: 14
                Supported Groups List Length: 12
                Supported Groups (6 groups)
                    Supported Group: x25519 (0x001d)
                    Supported Group: secp256r1 (0x0017)
                    Supported Group: secp384r1 (0x0018)
                    Supported Group: secp521r1 (0x0019)
                    Supported Group: ffdhe2048 (0x0100)
                    Supported Group: ffdhe3072 (0x0101)
            Extension: ec_point_formats (len=2)
                Type: ec_point_formats (11)
                Length: 2
                EC point formats Length: 1
                Elliptic curves point formats (1)
                    EC point format: uncompressed (0)
            Extension: SessionTicket TLS (len=0)
                Type: SessionTicket TLS (35)
                Length: 0
                Data (0 bytes)
            Extension: application_layer_protocol_negotiation (len=14)
                Type: application_layer_protocol_negotiation (16)
                Length: 14
                ALPN Extension Length: 12
                ALPN Protocol
                    ALPN string length: 2
                    ALPN Next Protocol: h2
                    ALPN string length: 8
                    ALPN Next Protocol: http/1.1
            Extension: status_request (len=5)
                Type: status_request (5)
                Length: 5
                Certificate Status Type: OCSP (1)
                Responder ID list Length: 0
                Request Extensions Length: 0
            Extension: Unknown type 34 (len=10)
                Type: Unknown (34)
                Length: 10
                Data: 00080403050306030203
            Extension: key_share (len=107)
                Type: key_share (51)
                Length: 107
                Key Share extension
                    Client Key Share Length: 105
                    Key Share Entry: Group: x25519, Key Exchange length: 32
                        Group: x25519 (29)
                        Key Exchange Length: 32
                        Key Exchange: ffb2dd5bac187a19211bc26a8d7ade4f7e28d2861a684332...
                    Key Share Entry: Group: secp256r1, Key Exchange length: 65
                        Group: secp256r1 (23)
                        Key Exchange Length: 65
                        Key Exchange: 04d9b4c45ff31926bd495945012ff9252059cd2c406e8bbb...
            Extension: supported_versions (len=5)
                Type: supported_versions (43)
                Length: 5
                Supported Versions length: 4
                Supported Version: TLS 1.3 (0x0304)
                Supported Version: TLS 1.2 (0x0303)
            Extension: signature_algorithms (len=24)
                Type: signature_algorithms (13)
                Length: 24
                Signature Hash Algorithms Length: 22
                Signature Hash Algorithms (11 algorithms)
                    Signature Algorithm: ecdsa_secp256r1_sha256 (0x0403)
                        Signature Hash Algorithm Hash: SHA256 (4)
                        Signature Hash Algorithm Signature: ECDSA (3)
                    Signature Algorithm: ecdsa_secp384r1_sha384 (0x0503)
                        Signature Hash Algorithm Hash: SHA384 (5)
                        Signature Hash Algorithm Signature: ECDSA (3)
                    Signature Algorithm: ecdsa_secp521r1_sha512 (0x0603)
                        Signature Hash Algorithm Hash: SHA512 (6)
                        Signature Hash Algorithm Signature: ECDSA (3)
                    Signature Algorithm: rsa_pss_rsae_sha256 (0x0804)
                        Signature Hash Algorithm Hash: Unknown (8)
                        Signature Hash Algorithm Signature: Unknown (4)
                    Signature Algorithm: rsa_pss_rsae_sha384 (0x0805)
                        Signature Hash Algorithm Hash: Unknown (8)
                        Signature Hash Algorithm Signature: Unknown (5)
                    Signature Algorithm: rsa_pss_rsae_sha512 (0x0806)
                        Signature Hash Algorithm Hash: Unknown (8)
                        Signature Hash Algorithm Signature: Unknown (6)
                    Signature Algorithm: rsa_pkcs1_sha256 (0x0401)
                        Signature Hash Algorithm Hash: SHA256 (4)
                        Signature Hash Algorithm Signature: RSA (1)
                    Signature Algorithm: rsa_pkcs1_sha384 (0x0501)
                        Signature Hash Algorithm Hash: SHA384 (5)
                        Signature Hash Algorithm Signature: RSA (1)
                    Signature Algorithm: rsa_pkcs1_sha512 (0x0601)
                        Signature Hash Algorithm Hash: SHA512 (6)
                        Signature Hash Algorithm Signature: RSA (1)
                    Signature Algorithm: ecdsa_sha1 (0x0203)
                        Signature Hash Algorithm Hash: SHA1 (2)
                        Signature Hash Algorithm Signature: ECDSA (3)
                    Signature Algorithm: rsa_pkcs1_sha1 (0x0201)
                        Signature Hash Algorithm Hash: SHA1 (2)
                        Signature Hash Algorithm Signature: RSA (1)
            Extension: psk_key_exchange_modes (len=2)
                Type: psk_key_exchange_modes (45)
                Length: 2
                PSK Key Exchange Modes Length: 1
                PSK Key Exchange Mode: PSK with (EC)DHE key establishment (psk_dhe_ke) (1)
            Extension: Unknown type 28 (len=2)
                Type: Unknown (28)
                Length: 2
                Data: 4001
            Extension: padding (len=138)
                Type: padding (21)
                Length: 138
                Padding Data: 000000000000000000000000000000000000000000000000...

Answer 4

Install wireshark and get as much material as you like for analysis - of course, you need to be a titan of thought ...