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server.go
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server.go
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// Copyright (C) 2020, IrineSistiana
//
// This file is part of simple-tls.
//
// simple-tls is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// simple-tls is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package core
import (
"crypto/tls"
"fmt"
"log"
"net"
"time"
)
func DoServer(l net.Listener, certificates []tls.Certificate, dst string, sendPaddingData bool, timeout time.Duration) error {
tlsConfig := new(tls.Config)
tlsConfig.MinVersion = tls.VersionTLS13
tlsConfig.NextProtos = []string{"h2"}
tlsConfig.Certificates = certificates
tlsConfig.MinVersion = tls.VersionTLS13
for {
clientRawConn, err := l.Accept()
if err != nil {
return fmt.Errorf("l.Accept(): %w", err)
}
go func() {
clientTLSConn := tls.Server(clientRawConn, tlsConfig)
defer clientTLSConn.Close()
// check client conn before dialing dst
if err := tls13HandshakeWithTimeout(clientTLSConn, time.Second*5); err != nil {
log.Printf("ERROR: DoServer: %s, tls13HandshakeWithTimeout: %v", clientRawConn.RemoteAddr(), err)
return
}
if err := handleClientConn(clientTLSConn, sendPaddingData, dst, timeout); err != nil {
log.Printf("ERROR: DoServer: %s, handleClientConn: %v", clientRawConn.RemoteAddr(), err)
return
}
}()
}
}
func handleClientConn(cc net.Conn, sendPaddingData bool, dst string, timeout time.Duration) (err error) {
dstConn, err := net.Dial("tcp", dst)
if err != nil {
return fmt.Errorf("net.Dial: %v", err)
}
defer dstConn.Close()
if sendPaddingData {
cc = newPaddingConn(cc, false, true)
}
if err := openTunnel(dstConn, cc, timeout); err != nil {
return fmt.Errorf("openTunnel: %v", err)
}
return nil
}