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clientserver.go
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clientserver.go
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package common
import (
"crypto/tls"
"fmt"
"golang.org/x/crypto/sha3"
"hash"
"io"
"net"
)
type TCPServer struct {
useTls bool
useTlsVerify bool
address string
Hash hash.Hash
Conn net.Conn
listener net.Listener
}
func NewTCPServer(useTls bool, useTlsVerify bool, address string) *TCPServer {
return &TCPServer{
useTls: useTls,
useTlsVerify: useTlsVerify,
address: address,
Hash: sha3.New512(),
}
}
func (this *TCPServer) Serve() ([]byte, error) {
if this.useTls {
tlsPackage, err := GetTlsPackage()
if Error(err) {
return nil, err
}
if this.useTlsVerify {
tlsPackage.Config.ClientAuth = tls.RequireAndVerifyClientCert
}
this.listener, err = tls.Listen("tcp", this.address, &tlsPackage.Config)
if Error(err) {
return nil, err
}
} else {
tcpAddr, err := net.ResolveTCPAddr("tcp", fmt.Sprintf(":%s", this.address))
if Error(err) {
return nil, err
}
this.listener, err = net.ListenTCP("tcp", tcpAddr)
if Error(err) {
return nil, err
}
}
var err error
if this.useTls {
this.Conn, err = this.listener.Accept()
Error(err)
tcpConn, ok := this.Conn.(*net.TCPConn)
if ok {
Error(tcpConn.SetLinger(0))
}
tlsConn, ok := this.Conn.(*tls.Conn)
if ok {
err := tlsConn.Handshake()
if Error(err) {
Error(this.Conn.Close())
}
}
} else {
this.Conn, err = this.listener.Accept()
Error(err)
}
tcpConn, ok := this.Conn.(*net.TCPConn)
if ok {
Error(tcpConn.SetLinger(0))
}
defer func() {
Error(this.Conn.Close())
if this.listener != nil {
Error(this.listener.Close())
}
}()
this.Hash.Reset()
_, err = io.Copy(this.Hash, this.Conn)
return this.Hash.Sum(nil), err
}
type TCPClient struct {
useTls bool
useTlsVerify bool
address string
Conn net.Conn
}
func NewTCPClient(useTls bool, useTlsVerify bool, address string) *TCPClient {
return &TCPClient{
useTls: useTls,
useTlsVerify: useTlsVerify,
address: address,
}
}
func (this *TCPClient) Connect() (io.ReadWriter, error) {
if this.useTls {
tlsPackage, err := GetTlsPackage()
if Error(err) {
return nil, err
}
hostname, _, err := net.SplitHostPort(this.address)
if Error(err) {
return nil, err
}
if hostname == "" {
hostname = "localhost"
}
// set hostname for self-signed cetificates
tlsPackage.Config.ServerName = hostname
tlsPackage.Config.InsecureSkipVerify = !this.useTlsVerify
this.Conn, err = tls.Dial("tcp", this.address, &tlsPackage.Config)
if Error(err) {
return nil, err
}
tlsSocket, ok := this.Conn.(*tls.Conn)
if ok {
if !tlsSocket.ConnectionState().HandshakeComplete {
return nil, fmt.Errorf("TLS handshake not completed")
}
}
} else {
tcpAddr, err := net.ResolveTCPAddr("tcp", this.address)
if Error(err) {
return nil, err
}
this.Conn, err = net.DialTCP("tcp", nil, tcpAddr)
if Error(err) {
return nil, err
}
}
return this.Conn, nil
}