| Akash Reddy Kankanala | 92dfdf8 | 2025-03-23 22:07:09 +0530 | [diff] [blame^] | 1 | // Copyright 2024 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | package http2 |
| 6 | |
| 7 | import ( |
| 8 | "crypto/tls" |
| 9 | "errors" |
| 10 | "net" |
| 11 | ) |
| 12 | |
| 13 | const nextProtoUnencryptedHTTP2 = "unencrypted_http2" |
| 14 | |
| 15 | // unencryptedNetConnFromTLSConn retrieves a net.Conn wrapped in a *tls.Conn. |
| 16 | // |
| 17 | // TLSNextProto functions accept a *tls.Conn. |
| 18 | // |
| 19 | // When passing an unencrypted HTTP/2 connection to a TLSNextProto function, |
| 20 | // we pass a *tls.Conn with an underlying net.Conn containing the unencrypted connection. |
| 21 | // To be extra careful about mistakes (accidentally dropping TLS encryption in a place |
| 22 | // where we want it), the tls.Conn contains a net.Conn with an UnencryptedNetConn method |
| 23 | // that returns the actual connection we want to use. |
| 24 | func unencryptedNetConnFromTLSConn(tc *tls.Conn) (net.Conn, error) { |
| 25 | conner, ok := tc.NetConn().(interface { |
| 26 | UnencryptedNetConn() net.Conn |
| 27 | }) |
| 28 | if !ok { |
| 29 | return nil, errors.New("http2: TLS conn unexpectedly found in unencrypted handoff") |
| 30 | } |
| 31 | return conner.UnencryptedNetConn(), nil |
| 32 | } |