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conn.go
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conn.go
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/*
* Copyright 2018 The CovenantSQL Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// Package etls implements "Enhanced Transport Layer Security", but more efficient
// than TLS used in https.
// example can be found in test case.
package etls
import (
"bytes"
"io"
"net"
"time"
"github.com/pkg/errors"
"github.com/CovenantSQL/CovenantSQL/conf"
"github.com/CovenantSQL/CovenantSQL/utils/log"
)
const (
// MagicSize is the ETLS magic header size.
MagicSize = 2
)
var (
// MagicBytes is the ETLS connection magic header.
MagicBytes = [MagicSize]byte{0xC0, 0x4E}
)
// CryptoConn implements net.Conn and Cipher interface.
type CryptoConn struct {
net.Conn
*Cipher
}
// NewConn returns a new CryptoConn.
func NewConn(c net.Conn, cipher *Cipher) *CryptoConn {
return &CryptoConn{
Conn: c,
Cipher: cipher,
}
}
// Dial connects to a address with a Cipher
// address should be in the form of host:port.
func Dial(network, address string, cipher *Cipher) (c *CryptoConn, err error) {
conn, err := net.DialTimeout(network, address, conf.TCPDialTimeout)
if err != nil {
log.WithField("addr", address).WithError(err).Error("connect failed")
return
}
c = NewConn(conn, cipher)
return
}
// Read iv and Encrypted data.
func (c *CryptoConn) Read(b []byte) (n int, err error) {
if c.decStream == nil {
buf := make([]byte, c.info.ivLen+MagicSize)
if _, err = io.ReadFull(c.Conn, buf); err != nil {
log.WithError(err).Info("read full failed")
return
}
iv := buf[:c.info.ivLen]
header := buf[c.info.ivLen:]
if err = c.initDecrypt(iv); err != nil {
return
}
c.decrypt(header, header)
if !bytes.Equal(header[:MagicSize], MagicBytes[:]) {
err = errors.New("bad stream ETLS header")
return
}
}
cipherData := make([]byte, len(b))
n, err = c.Conn.Read(cipherData)
if err != nil {
return
}
if n > 0 {
c.decrypt(b[0:n], cipherData[0:n])
}
return
}
// Write iv and Encrypted data.
func (c *CryptoConn) Write(b []byte) (n int, err error) {
var iv []byte
if c.encStream == nil {
iv, err = c.initEncrypt()
if err != nil {
return
}
}
if iv != nil {
ivHeader := make([]byte, len(iv)+MagicSize)
// Put initialization vector in buffer, do a single write to send both
// iv and data.
copy(ivHeader, iv)
c.encrypt(ivHeader[len(iv):], MagicBytes[:])
_, err = c.Conn.Write(ivHeader)
if err != nil {
return
}
}
cipherData := make([]byte, len(b))
c.encrypt(cipherData, b)
n, err = c.Conn.Write(cipherData)
return
}
// Close closes the connection.
// Any blocked Read or Write operations will be unblocked and return errors.
func (c *CryptoConn) Close() error {
if c.Conn == nil {
return nil
}
return c.Conn.Close()
}
// LocalAddr returns the local network address.
func (c *CryptoConn) LocalAddr() net.Addr {
return c.Conn.LocalAddr()
}
// RemoteAddr returns the remote network address.
func (c *CryptoConn) RemoteAddr() net.Addr {
return c.Conn.RemoteAddr()
}
// SetDeadline sets the read and write deadlines associated with the connection.
// A zero value for t means Read and Write will not time out.
// After a Write has timed out, the TLS state is corrupt and all future writes
// will return the same error.
func (c *CryptoConn) SetDeadline(t time.Time) error {
return c.Conn.SetDeadline(t)
}
// SetReadDeadline sets the read deadline on the underlying connection.
// A zero value for t means Read will not time out.
func (c *CryptoConn) SetReadDeadline(t time.Time) error {
return c.Conn.SetReadDeadline(t)
}
// SetWriteDeadline sets the write deadline on the underlying connection.
// A zero value for t means Write will not time out.
// After a Write has timed out, the TLS state is corrupt and all future writes
// will return the same error.
func (c *CryptoConn) SetWriteDeadline(t time.Time) error {
return c.Conn.SetWriteDeadline(t)
}