mirror of https://github.com/ehang-io/nps
503 lines
12 KiB
Go
Executable File
503 lines
12 KiB
Go
Executable File
package conn
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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/cnlh/nps/lib/common"
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"github.com/cnlh/nps/lib/file"
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"github.com/cnlh/nps/lib/pool"
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"github.com/cnlh/nps/lib/rate"
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"github.com/cnlh/nps/vender/github.com/xtaci/kcp"
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"io"
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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 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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if strings.Index(r.Host, ":") == -1 { //host不带端口， 默认80
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address = r.Host + ":443"
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} else {
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address = r.Host
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}
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} else { //http访问
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if strings.Index(r.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 > pool.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 <= pool.PoolSizeSmall {
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buf = pool.BufPoolSmall.Get().([]byte)[:cLen]
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defer pool.BufPoolSmall.Put(buf)
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} else {
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buf = pool.BufPoolMax.Get().([]byte)[:cLen]
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defer pool.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("Error reading specified length " + 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 = common.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(tp string) {
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if tp == "kcp" {
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s.setKcpAlive()
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} else {
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s.setTcpAlive()
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}
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}
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//设置连接为长连接
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func (s *Conn) setTcpAlive() {
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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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//设置连接为长连接
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func (s *Conn) setKcpAlive() {
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conn := s.Conn.(*kcp.UDPSession)
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conn.SetReadDeadline(time.Time{})
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}
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//设置连接为长连接
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func (s *Conn) SetReadDeadline(t time.Duration, tp string) {
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if tp == "kcp" {
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s.SetKcpReadDeadline(t)
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} else {
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s.SetTcpReadDeadline(t)
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}
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}
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//set read dead time
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func (s *Conn) SetTcpReadDeadline(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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//set read dead time
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func (s *Conn) SetKcpReadDeadline(t time.Duration) {
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s.Conn.(*kcp.UDPSession).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.Rate) (int, error) {
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if common.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.Rate) (n int, err error) {
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if common.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 := pool.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(common.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(common.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() (lk *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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lk = 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 lk.Id, err = GetLenByBytes(buf[:4]); err != nil {
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return
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}
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lk.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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lk.Host = string(buf[11 : 11+hostLen])
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lk.En = common.GetIntNoErrByStr(string(buf[11+hostLen]))
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lk.De = common.GetIntNoErrByStr(string(buf[12+hostLen]))
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lk.Crypt = common.GetBoolByStr(string(buf[13+hostLen]))
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}
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return
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}
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//send host info
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func (s *Conn) SendHostInfo(h *file.Host) (int, error) {
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/*
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The task info is formed as follows:
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+----+-----+---------+
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|type| len | content |
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+----+---------------+
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| 4 | 4 | ... |
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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(common.NEW_HOST))
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common.BinaryWrite(raw, h.Host, h.Target, h.HeaderChange, h.HostChange, h.Remark, h.Location)
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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) GetAddStatus() (b bool) {
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binary.Read(s.Conn, binary.LittleEndian, &b)
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return
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}
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func (s *Conn) WriteAddOk() error {
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return binary.Write(s.Conn, binary.LittleEndian, true)
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}
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func (s *Conn) WriteAddFail() error {
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defer s.Close()
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return binary.Write(s.Conn, binary.LittleEndian, false)
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}
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//get task info
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func (s *Conn) GetHostInfo() (h *file.Host, err error) {
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var l int
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var b []byte
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if l, err = s.GetLen(); err != nil {
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return
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} else if b, err = s.ReadLen(l); err != nil {
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return
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} else {
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arr := strings.Split(string(b), common.CONN_DATA_SEQ)
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h = new(file.Host)
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h.Host = arr[0]
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h.Target = arr[1]
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h.HeaderChange = arr[2]
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h.HostChange = arr[3]
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h.Remark = arr[4]
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h.Location = arr[5]
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h.Flow = new(file.Flow)
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h.NoStore = true
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}
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return
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}
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//send task info
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func (s *Conn) SendConfigInfo(c *file.Config) (int, error) {
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/*
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The task info is formed as follows:
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+----+-----+---------+
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|type| len | content |
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+----+---------------+
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| 4 | 4 | ... |
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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(common.NEW_CONF))
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common.BinaryWrite(raw, c.U, c.P, common.GetStrByBool(c.Crypt), c.Compress)
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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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//get task info
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func (s *Conn) GetConfigInfo() (c *file.Config, err error) {
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var l int
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var b []byte
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if l, err = s.GetLen(); err != nil {
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return
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} else if b, err = s.ReadLen(l); err != nil {
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return
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} else {
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arr := strings.Split(string(b), common.CONN_DATA_SEQ)
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c = new(file.Config)
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c.U = arr[0]
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c.P = arr[1]
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c.Crypt = common.GetBoolByStr(arr[2])
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c.Compress = arr[3]
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c.CompressDecode, c.CompressDecode = common.GetCompressType(arr[3])
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}
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return
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}
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//send task info
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func (s *Conn) SendTaskInfo(t *file.Tunnel) (int, error) {
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/*
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The task info is formed as follows:
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+----+-----+---------+
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|type| len | content |
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+----+---------------+
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| 4 | 4 | ... |
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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(common.NEW_TASK))
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common.BinaryWrite(raw, t.Mode, t.Ports, t.Target, t.Remark)
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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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//get task info
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func (s *Conn) GetTaskInfo() (t *file.Tunnel, err error) {
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var l int
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var b []byte
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if l, err = s.GetLen(); err != nil {
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return
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} else if b, err = s.ReadLen(l); err != nil {
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return
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} else {
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arr := strings.Split(string(b), common.CONN_DATA_SEQ)
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t = new(file.Tunnel)
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t.Mode = arr[0]
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t.Ports = arr[1]
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t.Target = arr[2]
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t.Id = file.GetCsvDb().GetTaskId()
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t.Status = true
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t.Flow = new(file.Flow)
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t.Remark = arr[3]
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t.NoStore = true
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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(common.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(common.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(common.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(common.WORK_MAIN))
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}
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//write main
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func (s *Conn) WriteConfig() (int, error) {
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s.Lock()
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defer s.Unlock()
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return s.Write([]byte(common.WORK_CONFIG))
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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(common.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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func SetUdpSession(sess *kcp.UDPSession) {
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sess.SetStreamMode(true)
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sess.SetWindowSize(1024, 1024)
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sess.SetReadBuffer(64 * 1024)
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sess.SetWriteBuffer(64 * 1024)
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sess.SetNoDelay(1, 10, 2, 1)
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sess.SetMtu(1600)
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sess.SetACKNoDelay(true)
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}
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