mirror of https://github.com/ehang-io/nps
436 lines
9.3 KiB
Go
Executable File
436 lines
9.3 KiB
Go
Executable File
package utils
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import (
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"bufio"
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"bytes"
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"encoding/binary"
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"errors"
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"github.com/golang/snappy"
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"io"
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"log"
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"net"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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"sync"
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"time"
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)
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const cryptKey = "1234567812345678"
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type CryptConn struct {
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conn net.Conn
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crypt bool
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rate *Rate
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}
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func NewCryptConn(conn net.Conn, crypt bool, rate *Rate) *CryptConn {
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c := new(CryptConn)
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c.conn = conn
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c.crypt = crypt
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c.rate = rate
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return c
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}
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//加密写
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func (s *CryptConn) Write(b []byte) (n int, err error) {
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n = len(b)
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if s.crypt {
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if b, err = AesEncrypt(b, []byte(cryptKey)); err != nil {
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return
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}
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}
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if b, err = GetLenBytes(b); err != nil {
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return
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}
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_, err = s.conn.Write(b)
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if s.rate != nil {
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s.rate.Get(int64(n))
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}
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return
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}
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//解密读
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func (s *CryptConn) Read(b []byte) (n int, err error) {
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var lens int
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var buf []byte
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var rb []byte
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c := NewConn(s.conn)
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if lens, err = c.GetLen(); err != nil {
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return
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}
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if buf, err = c.ReadLen(lens); err != nil {
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return
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}
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if s.crypt {
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if rb, err = AesDecrypt(buf, []byte(cryptKey)); err != nil {
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return
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}
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} else {
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rb = buf
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}
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copy(b, rb)
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n = len(rb)
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if s.rate != nil {
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s.rate.Get(int64(n))
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}
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return
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}
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type SnappyConn struct {
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w *snappy.Writer
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r *snappy.Reader
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crypt bool
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rate *Rate
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}
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func NewSnappyConn(conn net.Conn, crypt bool, rate *Rate) *SnappyConn {
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c := new(SnappyConn)
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c.w = snappy.NewBufferedWriter(conn)
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c.r = snappy.NewReader(conn)
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c.crypt = crypt
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c.rate = rate
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return c
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}
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//snappy压缩写 包含加密
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func (s *SnappyConn) Write(b []byte) (n int, err error) {
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n = len(b)
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if s.crypt {
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if b, err = AesEncrypt(b, []byte(cryptKey)); err != nil {
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log.Println("encode crypt error:", err)
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return
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}
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}
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if _, err = s.w.Write(b); err != nil {
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return
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}
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if err = s.w.Flush(); err != nil {
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return
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}
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if s.rate != nil {
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s.rate.Get(int64(n))
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}
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return
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}
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//snappy压缩读 包含解密
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func (s *SnappyConn) Read(b []byte) (n int, err error) {
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buf := BufPool.Get().([]byte)
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defer BufPool.Put(buf)
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if n, err = s.r.Read(buf); err != nil {
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return
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}
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var bs []byte
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if s.crypt {
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if bs, err = AesDecrypt(buf[:n], []byte(cryptKey)); err != nil {
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log.Println("decode crypt error:", err)
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return
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}
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} else {
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bs = buf[:n]
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}
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n = len(bs)
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copy(b, bs)
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if s.rate != nil {
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s.rate.Get(int64(n))
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}
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return
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}
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type Conn struct {
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Conn net.Conn
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sync.Mutex
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}
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//new conn
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func NewConn(conn net.Conn) *Conn {
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c := new(Conn)
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c.Conn = conn
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return c
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}
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//从tcp报文中解析出host，连接类型等
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func (s *Conn) GetHost() (method, address string, rb []byte, err error, r *http.Request) {
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var b [32 * 1024]byte
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var n int
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if n, err = s.Read(b[:]); err != nil {
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return
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}
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rb = b[:n]
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r, err = http.ReadRequest(bufio.NewReader(bytes.NewReader(rb)))
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if err != nil {
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return
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}
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hostPortURL, err := url.Parse(r.Host)
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if err != nil {
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address = r.Host
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err = nil
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return
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}
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if hostPortURL.Opaque == "443" { //https访问
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address = r.Host + ":443"
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} else { //http访问
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if strings.Index(hostPortURL.Host, ":") == -1 { //host不带端口， 默认80
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address = r.Host + ":80"
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} else {
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address = r.Host
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}
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}
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return
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}
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//读取指定长度内容
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func (s *Conn) ReadLen(cLen int) ([]byte, error) {
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if cLen > poolSize {
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return nil, errors.New("长度错误" + strconv.Itoa(cLen))
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}
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var buf []byte
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if cLen <= poolSizeSmall {
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buf = BufPoolSmall.Get().([]byte)[:cLen]
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defer BufPoolSmall.Put(buf)
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} else {
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buf = BufPoolMax.Get().([]byte)[:cLen]
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defer BufPoolMax.Put(buf)
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}
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if n, err := io.ReadFull(s, buf); err != nil || n != cLen {
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return buf, errors.New("读取指定长度错误" + err.Error())
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}
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return buf, nil
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}
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//read length or id (content length=4)
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func (s *Conn) GetLen() (int, error) {
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val, err := s.ReadLen(4)
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if err != nil {
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return 0, err
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}
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return GetLenByBytes(val)
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}
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//read flag
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func (s *Conn) ReadFlag() (string, error) {
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val, err := s.ReadLen(4)
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if err != nil {
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return "", err
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}
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return string(val), err
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}
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//read connect status
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func (s *Conn) GetConnStatus() (id int, status bool, err error) {
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id, err = s.GetLen()
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if err != nil {
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return
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}
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var b []byte
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if b, err = s.ReadLen(1); err != nil {
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return
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} else {
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status = GetBoolByStr(string(b[0]))
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}
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return
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}
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//设置连接为长连接
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func (s *Conn) SetAlive() {
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conn := s.Conn.(*net.TCPConn)
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conn.SetReadDeadline(time.Time{})
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conn.SetKeepAlive(true)
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conn.SetKeepAlivePeriod(time.Duration(2 * time.Second))
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}
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//set read dead time
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func (s *Conn) SetReadDeadline(t time.Duration) {
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s.Conn.(*net.TCPConn).SetReadDeadline(time.Now().Add(time.Duration(t) * time.Second))
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}
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//单独读（加密|压缩）
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func (s *Conn) ReadFrom(b []byte, compress int, crypt bool, rate *Rate) (int, error) {
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if COMPRESS_SNAPY_DECODE == compress {
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return NewSnappyConn(s.Conn, crypt, rate).Read(b)
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}
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return NewCryptConn(s.Conn, crypt, rate).Read(b)
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}
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//单独写（加密|压缩）
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func (s *Conn) WriteTo(b []byte, compress int, crypt bool, rate *Rate) (n int, err error) {
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if COMPRESS_SNAPY_ENCODE == compress {
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return NewSnappyConn(s.Conn, crypt, rate).Write(b)
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}
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return NewCryptConn(s.Conn, crypt, rate).Write(b)
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}
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//send msg
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func (s *Conn) SendMsg(content []byte, link *Link) (n int, err error) {
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/*
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The msg info is formed as follows:
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+----+--------+
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|id | content |
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+----+--------+
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| 4 | ... |
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+----+--------+
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*/
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s.Lock()
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defer s.Unlock()
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raw := bytes.NewBuffer([]byte{})
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binary.Write(raw, binary.LittleEndian, int32(link.Id))
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if n, err = s.Write(raw.Bytes()); err != nil {
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return
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}
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raw.Reset()
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binary.Write(raw, binary.LittleEndian, content)
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n, err = s.WriteTo(raw.Bytes(), link.En, link.Crypt, link.Rate)
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return
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}
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//get msg content from conn
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func (s *Conn) GetMsgContent(link *Link) (content []byte, err error) {
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s.Lock()
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defer s.Unlock()
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buf := BufPoolCopy.Get().([]byte)
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if n, err := s.ReadFrom(buf, link.De, link.Crypt, link.Rate); err == nil && n > 4 {
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content = buf[:n]
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}
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return
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}
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//send info for link
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func (s *Conn) SendLinkInfo(link *Link) (int, error) {
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/*
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The link info is formed as follows:
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+----------+------+----------+------+----------+-----+
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| id | len | type | hostlen | host | en | de |crypt |
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+----------+------+----------+------+---------+------+
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| 4 | 4 | 3 | 4 | host | 1 | 1 | 1 |
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+----------+------+----------+------+----+----+------+
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*/
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raw := bytes.NewBuffer([]byte{})
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binary.Write(raw, binary.LittleEndian, []byte(NEW_CONN))
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binary.Write(raw, binary.LittleEndian, int32(14+len(link.Host)))
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binary.Write(raw, binary.LittleEndian, int32(link.Id))
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binary.Write(raw, binary.LittleEndian, []byte(link.ConnType))
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binary.Write(raw, binary.LittleEndian, int32(len(link.Host)))
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binary.Write(raw, binary.LittleEndian, []byte(link.Host))
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binary.Write(raw, binary.LittleEndian, []byte(strconv.Itoa(link.En)))
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binary.Write(raw, binary.LittleEndian, []byte(strconv.Itoa(link.De)))
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binary.Write(raw, binary.LittleEndian, []byte(GetStrByBool(link.Crypt)))
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s.Lock()
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defer s.Unlock()
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return s.Write(raw.Bytes())
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}
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func (s *Conn) GetLinkInfo() (link *Link, err error) {
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s.Lock()
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defer s.Unlock()
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var hostLen, n int
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var buf []byte
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if n, err = s.GetLen(); err != nil {
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return
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}
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link = new(Link)
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if buf, err = s.ReadLen(n); err != nil {
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return
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}
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if link.Id, err = GetLenByBytes(buf[:4]); err != nil {
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return
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}
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link.ConnType = string(buf[4:7])
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if hostLen, err = GetLenByBytes(buf[7:11]); err != nil {
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return
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} else {
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link.Host = string(buf[11 : 11+hostLen])
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link.En = GetIntNoErrByStr(string(buf[11+hostLen]))
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link.De = GetIntNoErrByStr(string(buf[12+hostLen]))
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link.Crypt = GetBoolByStr(string(buf[13+hostLen]))
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}
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return
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}
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//write connect success
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func (s *Conn) WriteSuccess(id int) (int, error) {
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raw := bytes.NewBuffer([]byte{})
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binary.Write(raw, binary.LittleEndian, int32(id))
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binary.Write(raw, binary.LittleEndian, []byte("1"))
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s.Lock()
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defer s.Unlock()
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return s.Write(raw.Bytes())
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}
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//write connect fail
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func (s *Conn) WriteFail(id int) (int, error) {
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raw := bytes.NewBuffer([]byte{})
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binary.Write(raw, binary.LittleEndian, int32(id))
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binary.Write(raw, binary.LittleEndian, []byte("0"))
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s.Lock()
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defer s.Unlock()
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return s.Write(raw.Bytes())
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}
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//close
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func (s *Conn) Close() error {
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return s.Conn.Close()
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}
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//write
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func (s *Conn) Write(b []byte) (int, error) {
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return s.Conn.Write(b)
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}
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//read
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func (s *Conn) Read(b []byte) (int, error) {
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return s.Conn.Read(b)
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}
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//write error
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func (s *Conn) WriteError() (int, error) {
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return s.Write([]byte(RES_MSG))
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}
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//write sign flag
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func (s *Conn) WriteSign() (int, error) {
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return s.Write([]byte(RES_SIGN))
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}
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//write sign flag
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func (s *Conn) WriteClose() (int, error) {
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return s.Write([]byte(RES_CLOSE))
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}
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//write main
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func (s *Conn) WriteMain() (int, error) {
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s.Lock()
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defer s.Unlock()
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return s.Write([]byte(WORK_MAIN))
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}
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//write chan
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func (s *Conn) WriteChan() (int, error) {
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s.Lock()
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defer s.Unlock()
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return s.Write([]byte(WORK_CHAN))
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}
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//获取长度+内容
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func GetLenBytes(buf []byte) (b []byte, err error) {
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raw := bytes.NewBuffer([]byte{})
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if err = binary.Write(raw, binary.LittleEndian, int32(len(buf))); err != nil {
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return
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}
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if err = binary.Write(raw, binary.LittleEndian, buf); err != nil {
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return
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}
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b = raw.Bytes()
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return
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}
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//解析出长度
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func GetLenByBytes(buf []byte) (int, error) {
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nlen := binary.LittleEndian.Uint32(buf)
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if nlen <= 0 {
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return 0, errors.New("数据长度错误")
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}
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return int(nlen), nil
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}
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