mirror of https://github.com/ehang-io/nps
366 lines
7.1 KiB
Go
Executable File
366 lines
7.1 KiB
Go
Executable File
package lib
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import (
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"bufio"
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"bytes"
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"compress/gzip"
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"encoding/binary"
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"errors"
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"fmt"
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"github.com/golang/snappy"
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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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"time"
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)
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type CryptConn struct {
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conn net.Conn
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crypt bool
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}
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func NewCryptConn(conn net.Conn, crypt bool) *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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return c
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}
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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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if b, err = GetLenBytes(b); err != nil {
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return
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}
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}
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_, err = s.conn.Write(b)
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return
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}
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func (s *CryptConn) Read(b []byte) (n int, err error) {
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if s.crypt {
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var lens int
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var buf, bs []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 bs, err = AesDecrypt(buf, []byte(cryptKey)); err != nil {
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return
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}
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n = len(bs)
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copy(b, bs)
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return
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}
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return s.conn.Read(b)
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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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}
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func NewSnappyConn(conn net.Conn, crypt bool) *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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return c
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}
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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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err = s.w.Flush()
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return
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}
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func (s *SnappyConn) Read(b []byte) (n int, err error) {
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if n, err = s.r.Read(b); err != nil {
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return
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}
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if s.crypt {
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var bs []byte
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if bs, err = AesDecrypt(b[: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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n = len(bs)
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copy(b, bs)
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}
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return
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}
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type GzipConn struct {
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w *gzip.Writer
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r *gzip.Reader
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crypt bool
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}
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func NewGzipConn(conn net.Conn, crypt bool) *GzipConn {
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c := new(GzipConn)
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c.crypt = crypt
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c.w = gzip.NewWriter(conn)
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c.r, err = gzip.NewReader(conn)
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fmt.Println("err", err)
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//错误处理
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return c
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}
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func (s *GzipConn) Write(b []byte) (n int, err error) {
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fmt.Println(string(b))
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if n, err = s.w.Write(b); err != nil {
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//err = s.w.Flush()
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//s.w.Close()
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return
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}
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err = s.w.Flush()
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return
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}
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func (s *GzipConn) Read(b []byte) (n int, err error) {
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fmt.Println("read")
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if n, err = s.r.Read(b); err != nil {
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return
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}
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if s.crypt {
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var bs []byte
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if bs, err = AesDecrypt(b[: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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n = len(bs)
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copy(b, bs)
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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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}
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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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//读取指定内容长度
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func (s *Conn) ReadLen(len int) ([]byte, error) {
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buf := make([]byte, len)
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if n, err := s.Read(buf); err != nil || n != len {
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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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//获取长度
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func (s *Conn) GetLen() (int, error) {
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val := make([]byte, 4)
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if _, err := s.Read(val); 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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//写入长度
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func (s *Conn) WriteLen(buf []byte) (int, error) {
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var b []byte
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if b, err = GetLenBytes(buf); err != nil {
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return 0, err
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}
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return s.Write(b)
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}
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//读取flag
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func (s *Conn) ReadFlag() (string, error) {
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val := make([]byte, 4)
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if _, err := s.Read(val); 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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//读取host 连接地址 压缩类型
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func (s *Conn) GetHostFromConn() (typeStr string, host string, en, de int, crypt bool, err error) {
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retry:
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ltype := make([]byte, 3)
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if _, err = s.Read(ltype); err != nil {
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return
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}
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if typeStr = string(ltype); typeStr == TEST_FLAG {
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en, de, crypt = s.GetConnInfoFromConn()
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goto retry
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}
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len, err := s.GetLen()
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if err != nil {
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return
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}
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hostByte := make([]byte, len)
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if _, err = s.Read(hostByte); err != nil {
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return
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}
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host = string(hostByte)
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return
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}
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//写连接类型 和 host地址
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func (s *Conn) WriteHost(ltype string, host string) (int, error) {
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raw := bytes.NewBuffer([]byte{})
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binary.Write(raw, binary.LittleEndian, []byte(ltype))
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binary.Write(raw, binary.LittleEndian, int32(len([]byte(host))))
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binary.Write(raw, binary.LittleEndian, []byte(host))
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return s.Write(raw.Bytes())
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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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//从tcp报文中解析出host
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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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log.Println("解析host出错：", err)
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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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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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//压缩方式读
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func (s *Conn) ReadFromCompress(b []byte, compress int) (int, error) {
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switch compress {
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case COMPRESS_SNAPY_DECODE:
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r := snappy.NewReader(s)
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return r.Read(b)
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default:
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return s.Read(b)
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}
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return 0, nil
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}
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//压缩方式写
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func (s *Conn) WriteCompress(b []byte, compress int) (n int, err error) {
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switch compress {
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case COMPRESS_SNAPY_ENCODE:
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w := snappy.NewBufferedWriter(s)
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if n, err = w.Write(b); err == nil {
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w.Flush()
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}
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err = w.Close()
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default:
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n, err = s.Write(b)
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}
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return
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}
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//写压缩方式
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func (s *Conn) WriteConnInfo(en, de int, crypt bool) {
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s.Write([]byte(strconv.Itoa(en) + strconv.Itoa(de) + GetStrByBool(crypt)))
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}
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//获取压缩方式
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func (s *Conn) GetConnInfoFromConn() (en, de int, crypt bool) {
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buf := make([]byte, 3)
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s.Read(buf)
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en, _ = strconv.Atoi(string(buf[0]))
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de, _ = strconv.Atoi(string(buf[1]))
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crypt = GetBoolByStr(string(buf[2]))
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return
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}
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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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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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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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func (s *Conn) wError() (int, error) {
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return s.Write([]byte(RES_MSG))
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}
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func (s *Conn) wSign() (int, error) {
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return s.Write([]byte(RES_SIGN))
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}
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func (s *Conn) wMain() (int, error) {
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return s.Write([]byte(WORK_MAIN))
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}
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func (s *Conn) wChan() (int, error) {
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return s.Write([]byte(WORK_CHAN))
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}
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func (s *Conn) wTest() (int, error) {
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return s.Write([]byte(TEST_FLAG))
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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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