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3c77e076e2
Intended for future use with chatmail servers. Standard email ports may be blocked on some networks, while the HTTPS port may be accessible. This is a squashed commit of PR #255 by s0ph0s-dog.
33 lines
1.1 KiB
Go
33 lines
1.1 KiB
Go
// Copyright 2024 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package http2
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import (
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"crypto/tls"
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"errors"
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"net"
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)
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const nextProtoUnencryptedHTTP2 = "unencrypted_http2"
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// unencryptedNetConnFromTLSConn retrieves a net.Conn wrapped in a *tls.Conn.
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//
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// TLSNextProto functions accept a *tls.Conn.
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//
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// When passing an unencrypted HTTP/2 connection to a TLSNextProto function,
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// we pass a *tls.Conn with an underlying net.Conn containing the unencrypted connection.
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// To be extra careful about mistakes (accidentally dropping TLS encryption in a place
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// where we want it), the tls.Conn contains a net.Conn with an UnencryptedNetConn method
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// that returns the actual connection we want to use.
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func unencryptedNetConnFromTLSConn(tc *tls.Conn) (net.Conn, error) {
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conner, ok := tc.NetConn().(interface {
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UnencryptedNetConn() net.Conn
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})
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if !ok {
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return nil, errors.New("http2: TLS conn unexpectedly found in unencrypted handoff")
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}
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return conner.UnencryptedNetConn(), nil
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}
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