frp/utils/net/tcp.go

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// Copyright 2016 fatedier, fatedier@gmail.com
//
// 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 net
import (
"fmt"
"net"
"github.com/fatedier/frp/utils/log"
)
type TcpListener struct {
net.Addr
listener net.Listener
accept chan Conn
closeFlag bool
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log.Logger
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}
func ListenTcp(bindAddr string, bindPort int) (l *TcpListener, err error) {
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tcpAddr, err := net.ResolveTCPAddr("tcp", fmt.Sprintf("%s:%d", bindAddr, bindPort))
if err != nil {
return l, err
}
listener, err := net.ListenTCP("tcp", tcpAddr)
if err != nil {
return l, err
}
l = &TcpListener{
Addr: listener.Addr(),
listener: listener,
accept: make(chan Conn),
closeFlag: false,
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Logger: log.NewPrefixLogger(""),
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}
go func() {
for {
conn, err := listener.AcceptTCP()
if err != nil {
if l.closeFlag {
close(l.accept)
return
}
continue
}
c := NewTcpConn(conn)
l.accept <- c
}
}()
return l, err
}
// Wait util get one new connection or listener is closed
// if listener is closed, err returned.
func (l *TcpListener) Accept() (Conn, error) {
conn, ok := <-l.accept
if !ok {
return conn, fmt.Errorf("channel for tcp listener closed")
}
return conn, nil
}
func (l *TcpListener) Close() error {
if !l.closeFlag {
l.closeFlag = true
l.listener.Close()
}
return nil
}
// Wrap for TCPConn.
type TcpConn struct {
net.Conn
log.Logger
}
func NewTcpConn(conn net.Conn) (c *TcpConn) {
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c = &TcpConn{
Conn: conn,
Logger: log.NewPrefixLogger(""),
}
return
}
func ConnectTcpServer(addr string) (c Conn, err error) {
servertAddr, err := net.ResolveTCPAddr("tcp", addr)
if err != nil {
return
}
conn, err := net.DialTCP("tcp", nil, servertAddr)
if err != nil {
return
}
c = NewTcpConn(conn)
return
}