pub fn parse_crypto_frames(decrypted: &[u8]) -> Result<Vec<CryptoFrame>, Error>Expand description
Parse all CRYPTO frames from a decrypted Initial packet payload.
PADDING (0x00) and PING (0x01) frames are silently skipped. ACK frames (0x02, 0x03) are skipped by consuming their fields. Parsing stops when an unrecognised frame type is encountered or the buffer is exhausted.
ยงErrors
Returns Error::TruncatedFrame if a CRYPTO frame extends beyond the
available data. Returns Error::InvalidVarint if a varint field is
malformed.
Examples found in repository?
examples/decrypt_initial.rs (line 39)
11fn main() {
12 // RFC 9001 Appendix A.2 client Initial packet (complete, 1200 bytes).
13 let packet = rfc9001_client_initial();
14
15 let header = match quic_parser::parse_initial(&packet) {
16 Ok(h) => h,
17 Err(e) => {
18 eprintln!("header parse error: {e}");
19 return;
20 }
21 };
22
23 println!("Parsed header:");
24 println!(" version: {:#010x}", header.version);
25 println!(" dcid: {}", hex(header.dcid));
26 println!(" scid: {}", hex(header.scid));
27 println!(" payload: {} bytes", header.payload.len());
28
29 let decrypted = match quic_parser::decrypt_initial(&header) {
30 Ok(d) => d,
31 Err(e) => {
32 eprintln!("decryption error: {e}");
33 return;
34 }
35 };
36
37 println!("Decrypted {} bytes of frame data", decrypted.len());
38
39 let frames = match quic_parser::parse_crypto_frames(&decrypted) {
40 Ok(f) => f,
41 Err(e) => {
42 eprintln!("frame parse error: {e}");
43 return;
44 }
45 };
46
47 println!("Found {} CRYPTO frame(s)", frames.len());
48 for (i, f) in frames.iter().enumerate() {
49 println!(" frame {i}: offset={}, len={}", f.offset, f.data.len());
50 }
51
52 let stream = quic_parser::reassemble_crypto_stream(&frames);
53 println!("Reassembled crypto stream: {} bytes", stream.len());
54
55 if stream.len() >= 6 {
56 let msg_type = stream[0];
57 let length = u32::from_be_bytes([0, stream[1], stream[2], stream[3]]);
58 let tls_version = u16::from_be_bytes([stream[4], stream[5]]);
59 println!("TLS handshake: type={msg_type:#04x} length={length} version={tls_version:#06x}");
60 }
61}