chore: use fastrand to replace math/rand

transport/vmess/conn.go

@@ -11,17 +11,13 @@ import (
 	"errors"
 	"hash/fnv"
 	"io"
-	"math/rand"
 	"net"
 	"time"
 
+	"github.com/zhangyunhao116/fastrand"
 	"golang.org/x/crypto/chacha20poly1305"
 )
 
-func init() {
-	rand.Seed(time.Now().UnixNano())
-}
-
 // Conn wrapper a net.Conn with vmess protocol
 type Conn struct {
 	net.Conn
@@ -76,7 +72,7 @@ func (vc *Conn) sendRequest() error {
 	buf.WriteByte(vc.respV)
 	buf.WriteByte(OptionChunkStream)
 
-	p := rand.Intn(16)
+	p := fastrand.Intn(16)
 	// P Sec Reserve Cmd
 	buf.WriteByte(byte(p<<4) | byte(vc.security))
 	buf.WriteByte(0)
@@ -94,7 +90,7 @@ func (vc *Conn) sendRequest() error {
 	// padding
 	if p > 0 {
 		padding := make([]byte, p)
-		rand.Read(padding)
+		fastrand.Read(padding)
 		buf.Write(padding)
 	}
 
@@ -200,7 +196,7 @@ func hashTimestamp(t time.Time) []byte {
 // newConn return a Conn instance
 func newConn(conn net.Conn, id *ID, dst *DstAddr, security Security, isAead bool) (*Conn, error) {
 	randBytes := make([]byte, 33)
-	rand.Read(randBytes)
+	fastrand.Read(randBytes)
 	reqBodyIV := make([]byte, 16)
 	reqBodyKey := make([]byte, 16)
 	copy(reqBodyIV[:], randBytes[:16])

transport/vmess/h2.go

@@ -2,11 +2,11 @@ package vmess
 
 import (
 	"io"
-	"math/rand"
 	"net"
 	"net/http"
 	"net/url"
 
+	"github.com/zhangyunhao116/fastrand"
 	"golang.org/x/net/http2"
 )
 
@@ -26,7 +26,7 @@ type H2Config struct {
 func (hc *h2Conn) establishConn() error {
 	preader, pwriter := io.Pipe()
 
-	host := hc.cfg.Hosts[rand.Intn(len(hc.cfg.Hosts))]
+	host := hc.cfg.Hosts[fastrand.Intn(len(hc.cfg.Hosts))]
 	path := hc.cfg.Path
 	// TODO: connect use VMess Host instead of H2 Host
 	req := http.Request{

transport/vmess/http.go

@@ -4,10 +4,11 @@ import (
 	"bufio"
 	"bytes"
 	"fmt"
-	"math/rand"
 	"net"
 	"net/http"
 	"net/textproto"
+
+	"github.com/zhangyunhao116/fastrand"
 )
 
 type httpConn struct {
@@ -51,16 +52,16 @@ func (hc *httpConn) Write(b []byte) (int, error) {
 		return hc.Conn.Write(b)
 	}
 
-	path := hc.cfg.Path[rand.Intn(len(hc.cfg.Path))]
+	path := hc.cfg.Path[fastrand.Intn(len(hc.cfg.Path))]
 	host := hc.cfg.Host
 	if header := hc.cfg.Headers["Host"]; len(header) != 0 {
-		host = header[rand.Intn(len(header))]
+		host = header[fastrand.Intn(len(header))]
 	}
 
 	u := fmt.Sprintf("http://%s%s", host, path)
 	req, _ := http.NewRequest("GET", u, bytes.NewBuffer(b))
 	for key, list := range hc.cfg.Headers {
-		req.Header.Set(key, list[rand.Intn(len(list))])
+		req.Header.Set(key, list[fastrand.Intn(len(list))])
 	}
 	req.ContentLength = int64(len(b))
 	if err := req.Write(hc.Conn); err != nil {

transport/vmess/vmess.go

@@ -2,12 +2,13 @@ package vmess
 
 import (
 	"fmt"
-	"github.com/Dreamacro/clash/common/utils"
-	"math/rand"
 	"net"
 	"runtime"
 
+	"github.com/Dreamacro/clash/common/utils"
+
 	"github.com/gofrs/uuid"
+	"github.com/zhangyunhao116/fastrand"
 )
 
 // Version of vmess
@@ -77,7 +78,7 @@ type Config struct {
 
 // StreamConn return a Conn with net.Conn and DstAddr
 func (c *Client) StreamConn(conn net.Conn, dst *DstAddr) (net.Conn, error) {
-	r := rand.Intn(len(c.user))
+	r := fastrand.Intn(len(c.user))
 	return newConn(conn, c.user[r], dst, c.security, c.isAead)
 }
 

transport/vmess/websocket.go

@@ -8,9 +8,7 @@ import (
 	"encoding/binary"
 	"errors"
 	"fmt"
-
 	"io"
-	"math/rand"
 	"net"
 	"net/http"
 	"net/url"
@@ -22,7 +20,9 @@ import (
 	"github.com/Dreamacro/clash/common/buf"
 	N "github.com/Dreamacro/clash/common/net"
 	tlsC "github.com/Dreamacro/clash/component/tls"
+
 	"github.com/gorilla/websocket"
+	"github.com/zhangyunhao116/fastrand"
 )
 
 type websocketConn struct {
@@ -120,7 +120,7 @@ func (wsc *websocketConn) WriteBuffer(buffer *buf.Buffer) error {
 		binary.BigEndian.PutUint64(header[2:], uint64(dataLen))
 	}
 
-	maskKey := rand.Uint32()
+	maskKey := fastrand.Uint32()
 	binary.LittleEndian.PutUint32(header[1+payloadBitLength:], maskKey)
 	N.MaskWebSocket(maskKey, data)