mirror of
https://github.com/SunBK201/UA3F.git
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refactor: improve HTTP request handling and User-Agent processing
This commit is contained in:
SunBK201
parent
aa641eb3a3
commit
b9bceebafb
219
src/main.go
219
src/main.go
@ -1,24 +1,24 @@
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package main
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import (
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"bufio"
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"encoding/binary"
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"errors"
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"flag"
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"fmt"
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"io"
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"net"
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"net/http"
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"strings"
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"time"
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"github.com/dlclark/regexp2"
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"github.com/hashicorp/golang-lru/v2/expirable"
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"github.com/sirupsen/logrus"
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"github.com/sunbk201/ua3f/http"
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"github.com/sunbk201/ua3f/log"
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)
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var version = "0.6.0"
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var payloadByte []byte
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var payload string
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var uaPattern string
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var uaRegexp *regexp2.Regexp
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@ -31,8 +31,6 @@ var whitelist = []string{
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"Go-http-client/1.1",
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}
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const RDBUF = 1024 * 8
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func main() {
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var addr string
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var port int
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@ -62,8 +60,6 @@ func main() {
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cache = expirable.NewLRU[string, string](300, nil, time.Second*600)
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payloadByte = []byte(payload)
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server, err := net.Listen("tcp", fmt.Sprintf("%s:%d", addr, port))
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if err != nil {
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logrus.Fatal("Listen failed: ", err)
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@ -88,7 +84,6 @@ func main() {
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func process(client net.Conn) {
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if err := Socks5Auth(client); err != nil {
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// logrus.Error("Auth failed: ", err)
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client.Close()
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return
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}
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@ -108,7 +103,6 @@ func process(client net.Conn) {
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return
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}
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Socks5Forward(client, target, destAddrPort)
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// Socks5Relay(client, target, destAddrPort)
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}
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func Socks5Auth(client net.Conn) (err error) {
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@ -337,7 +331,7 @@ func Socks5Forward(client, target net.Conn, destAddrPort string) {
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gforward := func(dst, src net.Conn) {
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defer dst.Close()
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defer src.Close()
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CopyPileline(dst, src, destAddrPort)
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transfer(dst, src, destAddrPort)
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}
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go forward(client, target)
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@ -349,31 +343,13 @@ func Socks5Forward(client, target net.Conn, destAddrPort string) {
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}
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}
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func min(a, b int) int {
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if a < b {
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return a
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}
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return b
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}
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func CopyPileline(dst io.Writer, src io.Reader, destAddrPort string) {
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buf := make([]byte, RDBUF)
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nr, err := src.Read(buf)
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func isHTTP(reader *bufio.Reader) bool {
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buf, err := reader.Peek(7)
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if err != nil {
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if err == io.EOF {
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logrus.Debug(fmt.Sprintf("[%s][%s] read EOF in first phase", destAddrPort, src.(*net.TCPConn).RemoteAddr().String()))
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} else if strings.Contains(err.Error(), "use of closed network connection") {
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logrus.Debug(fmt.Sprintf("[%s][%s] read closed in first phase: %s", destAddrPort, src.(*net.TCPConn).RemoteAddr().String(), err.Error()))
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} else {
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logrus.Error(fmt.Sprintf("[%s][%s] read error in first phase: %s", destAddrPort, src.(*net.TCPConn).RemoteAddr().String(), err.Error()))
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}
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return
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logrus.Error(fmt.Sprintf("Peek error: %s", err.Error()))
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return false
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}
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if nr == 0 {
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logrus.Debug(fmt.Sprintf("[%s][%s] read 0 in first phase", destAddrPort, src.(*net.TCPConn).RemoteAddr().String()))
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return
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}
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hint := string(buf[0:7])
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hint := string(buf)
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is_http := false
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for _, v := range HTTP_METHOD {
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if strings.HasPrefix(hint, v) {
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@ -381,126 +357,85 @@ func CopyPileline(dst io.Writer, src io.Reader, destAddrPort string) {
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break
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}
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}
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return is_http
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}
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func buildNewUA(originUA string, targetUA string, uaRegexp *regexp2.Regexp, enablePartialReplace bool) string {
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if enablePartialReplace && uaRegexp != nil {
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newUaHearder, err := uaRegexp.Replace(originUA, targetUA, -1, -1)
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if err != nil {
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logrus.Error(fmt.Sprintf("User-Agent Replace Error: %s", err.Error()))
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return targetUA
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}
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return newUaHearder
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}
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return targetUA
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}
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func transfer(dst net.Conn, src net.Conn, destAddrPort string) {
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srcReader := bufio.NewReader(src)
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is_http := isHTTP(srcReader)
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if !is_http {
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dst.Write(buf[0:nr])
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io.Copy(dst, src)
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cache.Add(destAddrPort, destAddrPort)
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logrus.Debug(fmt.Sprintf("Not HTTP, Hint: %v, Add LRU Relay Cache: %s, Cache Len: %d", buf[0:7], destAddrPort, cache.Len()))
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logrus.Debug(fmt.Sprintf("Not HTTP, Add LRU Relay Cache: %s, Cache Len: %d", destAddrPort, cache.Len()))
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io.Copy(dst, srcReader)
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return
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}
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for {
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parser := http.NewHTTPParser()
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httpBodyOffset, err := parser.Parse(buf[0:nr])
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for err == http.ErrMissingData {
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var m int
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m, err = src.Read(buf[nr:])
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if err != nil {
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logrus.Debug(fmt.Sprintf("[%s] read error in http accumulation: %v", destAddrPort, err))
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break
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}
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nr += m
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httpBodyOffset, err = parser.Parse(buf[:nr])
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}
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value, start, end := parser.FindHeader([]byte("User-Agent"))
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uaStr := string(value)
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if value != nil && end > start {
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isInWhiteList := false
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isMatchUaPattern := true
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if uaPattern != "" {
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isMatchUaPattern, err = uaRegexp.MatchString(uaStr)
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if err != nil {
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logrus.Error(fmt.Sprintf("[%s][%s] User-Agent Regex Pattern Match Error: %s", destAddrPort, src.(*net.TCPConn).RemoteAddr().String(), err.Error()))
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isMatchUaPattern = true
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}
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}
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for _, v := range whitelist {
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if v == uaStr {
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isInWhiteList = true
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break
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}
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}
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if isInWhiteList || !isMatchUaPattern {
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if !isMatchUaPattern {
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logrus.Debug(fmt.Sprintf("[%s][%s] Not Hit User-Agent Pattern: %s", destAddrPort, src.(*net.TCPConn).RemoteAddr().String(), uaStr))
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}
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if isInWhiteList {
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logrus.Debug(fmt.Sprintf("[%s][%s] Hit User-Agent Whitelist: %s, Add LRU Relay Cache, Cache Len: %d", destAddrPort, src.(*net.TCPConn).RemoteAddr().String(), uaStr, cache.Len()))
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cache.Add(destAddrPort, destAddrPort)
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}
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dst.Write(buf[0:nr])
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io.Copy(dst, src)
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return
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}
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logrus.Debug(fmt.Sprintf("[%s][%s] Hit User-Agent: %s", destAddrPort, src.(*net.TCPConn).RemoteAddr().String(), uaStr))
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for i := start; i < end; i++ {
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buf[i] = 32
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}
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if enablePartialReplace && uaRegexp != nil {
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newUaHearder, err := uaRegexp.Replace(uaStr, payload, -1, -1)
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if err != nil {
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logrus.Error(fmt.Sprintf("[%s][%s] User-Agent Replace Error: %s", destAddrPort, src.(*net.TCPConn).RemoteAddr().String(), err.Error()))
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payloadByte = []byte(payload)
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} else {
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payloadByte = []byte(newUaHearder)
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}
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}
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for i := range payloadByte {
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if start+i >= end {
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break
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}
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buf[start+i] = payloadByte[i]
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}
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} else {
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logrus.Debug(fmt.Sprintf("[%s] Not found User-Agent, Add LRU Relay Cache, Cache Len: %d", destAddrPort, cache.Len()))
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dst.Write(buf[0:nr])
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io.Copy(dst, src)
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cache.Add(destAddrPort, destAddrPort)
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return
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}
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bodyLen := int(parser.ContentLength())
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if bodyLen == -1 {
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bodyLen = 0
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}
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_, ew := dst.Write(buf[0:min(httpBodyOffset+bodyLen, nr)])
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if ew != nil {
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logrus.Error(fmt.Sprintf("[%s][%s] write error: %s", destAddrPort, src.(*net.TCPConn).RemoteAddr().String(), ew.Error()))
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break
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}
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if httpBodyOffset+bodyLen > nr {
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left := httpBodyOffset + bodyLen - nr
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for left > 0 {
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lr := min(left, RDBUF)
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m, err := src.Read(buf[0:lr])
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if err != nil {
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logrus.Error(fmt.Sprintf("[%s][%s] read error in large body: %s", destAddrPort, src.(*net.TCPConn).RemoteAddr().String(), err.Error()))
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break
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}
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_, ew := dst.Write(buf[0:m])
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if ew != nil {
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logrus.Error(fmt.Sprintf("[%s][%s] write error in large body: %s", destAddrPort, src.(*net.TCPConn).RemoteAddr().String(), ew.Error()))
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break
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}
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left -= m
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}
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nr = 0
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} else if httpBodyOffset+bodyLen < nr {
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copy(buf[0:], buf[httpBodyOffset+bodyLen:])
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nr = nr - httpBodyOffset - bodyLen
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} else {
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nr = 0
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}
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m, err := src.Read(buf[nr:])
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nr += m
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request, err := http.ReadRequest(srcReader)
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if err != nil {
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if err == io.EOF {
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logrus.Debug(fmt.Sprintf("[%s][%s] read EOF in next phase", destAddrPort, src.(*net.TCPConn).RemoteAddr().String()))
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logrus.Debug(fmt.Sprintf("[%s][%s] read EOF in first phase", destAddrPort, src.(*net.TCPConn).RemoteAddr().String()))
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} else if strings.Contains(err.Error(), "use of closed network connection") {
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logrus.Debug(fmt.Sprintf("[%s][%s] read closed in next phase: %s", destAddrPort, src.(*net.TCPConn).RemoteAddr().String(), err.Error()))
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logrus.Debug(fmt.Sprintf("[%s][%s] read closed in first phase: %s", destAddrPort, src.(*net.TCPConn).RemoteAddr().String(), err.Error()))
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} else {
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logrus.Error(fmt.Sprintf("[%s][%s] read error in next phase: %s", destAddrPort, src.(*net.TCPConn).RemoteAddr().String(), err.Error()))
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logrus.Error(fmt.Sprintf("[%s][%s] read error in first phase: %s", destAddrPort, src.(*net.TCPConn).RemoteAddr().String(), err.Error()))
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}
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return
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}
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uaStr := request.Header.Get("User-Agent")
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if uaStr == "" {
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cache.Add(destAddrPort, destAddrPort)
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logrus.Debug(fmt.Sprintf("[%s] Not found User-Agent, Add LRU Relay Cache, Cache Len: %d", destAddrPort, cache.Len()))
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io.Copy(dst, srcReader)
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return
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}
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isInWhiteList := false
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isMatchUaPattern := true
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if uaPattern != "" {
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isMatchUaPattern, err = uaRegexp.MatchString(uaStr)
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if err != nil {
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logrus.Error(fmt.Sprintf("[%s][%s] User-Agent Regex Pattern Match Error: %s", destAddrPort, src.(*net.TCPConn).RemoteAddr().String(), err.Error()))
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isMatchUaPattern = true
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}
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}
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for _, v := range whitelist {
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if v == uaStr {
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isInWhiteList = true
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break
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}
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}
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if isInWhiteList || !isMatchUaPattern {
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if !isMatchUaPattern {
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logrus.Debug(fmt.Sprintf("[%s][%s] Not Hit User-Agent Pattern: %s", destAddrPort, src.(*net.TCPConn).RemoteAddr().String(), uaStr))
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}
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if isInWhiteList {
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logrus.Debug(fmt.Sprintf("[%s][%s] Hit User-Agent Whitelist: %s, Add LRU Relay Cache, Cache Len: %d", destAddrPort, src.(*net.TCPConn).RemoteAddr().String(), uaStr, cache.Len()))
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cache.Add(destAddrPort, destAddrPort)
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}
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err = request.Write(dst)
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if err != nil {
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logrus.Error(fmt.Sprintf("[%s][%s] write error: %s", destAddrPort, src.(*net.TCPConn).RemoteAddr().String(), err.Error()))
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break
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}
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io.Copy(dst, srcReader)
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return
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}
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logrus.Debug(fmt.Sprintf("[%s][%s] Hit User-Agent: %s", destAddrPort, src.(*net.TCPConn).RemoteAddr().String(), uaStr))
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request.Header.Set("User-Agent", buildNewUA(uaStr, payload, uaRegexp, enablePartialReplace))
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err = request.Write(dst)
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if err != nil {
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logrus.Error(fmt.Sprintf("[%s][%s] write error after replace user-agent: %s", destAddrPort, src.(*net.TCPConn).RemoteAddr().String(), err.Error()))
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break
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}
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}
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