/
tcp.go
327 lines (293 loc) · 7.69 KB
/
tcp.go
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//go:build linux || darwin
// +build linux darwin
package tool
// 当前文件用于 tcp 数据快速拷贝
import (
"crypto/sha256"
"crypto/tls"
"encoding/binary"
"errors"
"io"
"log"
"net"
"syscall"
"time"
"github.com/unstoppablego/framework/logs"
"golang.org/x/crypto/chacha20"
)
func CheckCloseByReadOneByte(c net.Conn, err error, readLen int, debug bool) (bool, []byte, int) {
defer func() {
if r := recover(); r != nil {
if debug {
log.Println("CheckCloseByReadOneByte panic ", r)
}
return
}
}()
var one = make([]byte, 1)
if tc, ok := c.(*tls.Conn); ok {
len, err := tc.Read(one) //c 语言中 内核代码会去读去,如果有错误的话回直接返回 ,由于外层使用的是 Copy From 函数可能屏蔽了一部分错误信息
if len == 0 && err != nil {
if debug {
log.Println("CheckCloseByReadOneByte conn to tls conn test", err, len)
}
return true, nil, 0
}
if len == 0 && err == nil {
if err := connMsgPeekCheck(c); err != nil {
if debug {
log.Println("connMsgPeekCheck conn to tls conn test", err, len)
}
return true, nil, 0
}
}
return false, one, len
} else if tc, ok := c.(*net.TCPConn); ok {
len, err := tc.Read(one)
if len == 0 && err != nil {
if debug {
log.Println("CheckCloseByReadOneByte conn to tcp conn test", err, len)
}
return true, nil, 0
}
if len == 0 && err == nil {
if err := connMsgPeekCheck(c); err != nil {
if debug {
log.Println("connMsgPeekCheck conn to tcp conn test", err, len)
}
return true, nil, 0
}
}
return false, one, len
} else {
if debug {
log.Println("CheckCloseByReadOneByte unknow net conn tpye")
}
return true, nil, 0
}
}
type LimitSpeed interface {
IsLimit(name string) bool
}
type NoneLimitSpeed struct {
}
func (NoneLimitSpeed) Islimit(name string) bool {
return false
}
// net conn copy from src to dst and process close conn
func CopyConn(src net.Conn, dst net.Conn, debug bool, limit func() bool, upTraffic func(int)) (allwritten int) {
defer src.Close()
defer dst.Close()
var sized = 32 * 1024 * 2
written := 0
defer func() { upTraffic(allwritten) }()
var arMin int = 1024 * 32 * 12
needLimit := limit()
if needLimit {
arMin = 1024 * 32 * 1
sized = 1024
}
var recvBuf = make([]byte, sized, sized) // 128/4
var firstBitTorrentCheck bool
for {
now := time.Now().Nanosecond()
rlen, err := src.Read(recvBuf)
if rlen > 20 && firstBitTorrentCheck == false {
firstBitTorrentCheck = true
//明确了TCP BitTorrent protocol 检测方法
//难道是明文?
if recvBuf[0] == 19 && string(recvBuf[1:20]) == "BitTorrent protocol" {
logs.Error("not support BitTorrent protocol")
return
}
if IsNotSupportEmail(recvBuf[0:rlen]) {
logs.Error("not support Email Send")
return
}
}
if rlen > 0 {
//处理写入
wlen, err := dst.Write(recvBuf[0:rlen])
if wlen < 0 || rlen < wlen {
wlen = 0
if err == nil {
err = errors.New("write error")
}
}
written += wlen
allwritten += wlen
// logs.Info(allwritten)
//上报流量输出
if allwritten/1024/1024 > 512 {
// logs.Info("超过512m上报")
upTraffic(allwritten)
allwritten = 0
}
if err != nil {
if debug {
log.Println("CopyConn dst.Write error", err, src.RemoteAddr()) //打印下未知错误
}
return
}
if rlen != wlen {
err = errors.New("rlen != wlen")
if debug {
log.Println("CopyConn dst.Write error", err, src.RemoteAddr()) //打印下未知错误
}
return
}
}
if err != nil {
if err == io.EOF || err == net.ErrClosed || err == syscall.EPIPE {
return
} else {
if debug {
log.Println("CopyConn unknow error", err, src.RemoteAddr()) //打印下未知错误
}
return
}
} else {
if rlen == 0 {
if cs, ok := src.(*Chacha20Stream); ok {
if closed, one, len := CheckCloseByReadOneByte(cs.Conn, err, int(rlen), debug); !closed {
if len > 0 {
if _, err := dst.Write(one[0:len]); err != nil {
if debug {
log.Println("CopyConn write one byte err", err)
}
return
}
}
} else {
return
}
} else {
if closed, one, len := CheckCloseByReadOneByte(src, err, int(rlen), debug); !closed {
if len > 0 {
if _, err := dst.Write(one[0:len]); err != nil {
if debug {
log.Println("CopyConn write one byte err", err)
}
return
}
}
} else {
return
}
}
}
}
//limit speed
if needLimit {
// logs.Info(fmt.Sprintf("sleep %d ms", wl))
dif := time.Now().Nanosecond() - now
// logs.Info(fmt.Sprintf(" %d %d", written, dif))
//经过了多少毫秒
waitTime := written*1000000000/arMin - dif
// logs.Info(fmt.Sprintf(" %d %d %d %d %d", written, arMin, dif, (written * 1000000000 / arMin), waitTime))
if waitTime > 0 {
// logs.Info(fmt.Sprintf("sleep %d nas", waitTime))
time.Sleep(time.Duration(waitTime) * time.Nanosecond)
written = 0
// now = time.Now().Nanosecond() / 1e6
}
}
}
}
func CopyConnNoLimit() bool {
return false
}
// Note that if another goroutine is not actively read()'ing the stream, this will not return EOF until the stream is read and its buffer drained.
func connMsgPeekCheck(connc net.Conn) error {
var conn net.Conn
if tc, ok := connc.(*tls.Conn); ok {
conn = tc.NetConn()
} else if _, ok := connc.(*net.TCPConn); ok {
conn = connc
} else {
return errors.New("connMsgPeekCheck unknow net conn tpye")
}
var sysErr error = nil
rc, err := conn.(syscall.Conn).SyscallConn()
if err != nil {
return err
}
err = rc.Read(func(fd uintptr) bool {
var buf []byte = []byte{0}
n, _, err := syscall.Recvfrom(int(fd), buf, syscall.MSG_PEEK|syscall.MSG_DONTWAIT) //MSG_DONTWAIT 调用函数时不阻塞
switch {
case n == 0 && err == nil:
sysErr = io.EOF
case err == syscall.EAGAIN || err == syscall.EWOULDBLOCK: //syscall.EAGAIN 非阻塞模式下调用了阻塞操作 在VxWorks和Windows上,EAGAIN的名字叫做EWOULDBLOCK
sysErr = nil
default:
sysErr = err
}
return true
})
if err != nil {
return err
}
return sysErr
}
type Chacha20Stream struct {
key []byte
Nonce []byte
encoder *chacha20.Cipher
decoder *chacha20.Cipher
Conn net.Conn
}
func NewChacha20Stream(key string, Nonce int64, conn net.Conn) (*Chacha20Stream, error) {
key32 := sha256.Sum256([]byte(key))
s := &Chacha20Stream{key: key32[:], // should be exactly 32 bytes
Conn: conn}
var buf = make([]byte, 8)
s.Nonce = make([]byte, chacha20.NonceSizeX)
binary.BigEndian.PutUint64(buf, uint64(Nonce))
copy(s.Nonce, buf)
var err error
s.encoder, err = chacha20.NewUnauthenticatedCipher(s.key, s.Nonce)
if err != nil {
logs.Error(err)
}
s.decoder, err = chacha20.NewUnauthenticatedCipher(s.key, s.Nonce)
if err != nil {
logs.Error(err)
}
return s, nil
}
func (s *Chacha20Stream) Read(p []byte) (int, error) {
n, err := s.Conn.Read(p)
if err != nil || n == 0 {
return n, err
}
dst := make([]byte, n)
pn := p[:n]
s.decoder.XORKeyStream(dst, pn)
copy(pn, dst)
return n, nil
}
func (s *Chacha20Stream) Write(p []byte) (int, error) {
dst := make([]byte, len(p))
s.encoder.XORKeyStream(dst, p)
return s.Conn.Write(dst)
}
func (s *Chacha20Stream) Close() error {
return s.Conn.Close()
}
func (s *Chacha20Stream) LocalAddr() net.Addr {
return s.Conn.LocalAddr()
}
func (s *Chacha20Stream) RemoteAddr() net.Addr {
return s.Conn.LocalAddr()
}
// func (s )
func (s *Chacha20Stream) SetDeadline(t time.Time) error {
return s.Conn.SetDeadline(t)
}
func (s *Chacha20Stream) SetReadDeadline(t time.Time) error {
return s.Conn.SetReadDeadline(t)
}
func (s *Chacha20Stream) SetWriteDeadline(t time.Time) error {
return s.Conn.SetWriteDeadline(t)
}