Initial commit

config.yaml

@@ -0,0 +1,3 @@
+
+port: 7777
+ip_list: "ip.txt"

go.mod

@@ -0,0 +1,8 @@
+module github.com/fangdingjun/proxy_util
+
+go 1.15
+
+require (
+	github.com/fangdingjun/go-log/v5 v5.0.0
+	gopkg.in/yaml.v2 v2.4.0
+)

go.sum

@@ -0,0 +1,8 @@
+github.com/fangdingjun/go-log v1.0.20 h1:ZNfkghi6WA1wXg2KkBz8idbqg4M63VezKR63OLX6FEw=
+github.com/fangdingjun/go-log/v5 v5.0.0 h1:vdh9Bk9C4ZFL6KoO6rII73zQIyaLf7hFdBvucO/ckiE=
+github.com/fangdingjun/go-log/v5 v5.0.0/go.mod h1:V012Oxo0/pSbccX4OFSp9MJglXwNsZo2ByBBorr7zzM=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=

handler.go

@@ -0,0 +1,121 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"math/rand"
+	"net"
+	"net/http"
+	"time"
+
+	log "github.com/fangdingjun/go-log/v5"
+)
+
+func getLocalIP() string {
+	n := rand.Int() % len(iplist)
+	return iplist[n]
+}
+
+func proxyHandler(w http.ResponseWriter, r *http.Request) {
+	if r.Method == http.MethodConnect {
+		handleConnect(w, r)
+		return
+	}
+	if r.Method == http.MethodGet || r.Method == http.MethodPost {
+		handleHTTP(w, r)
+		return
+	}
+	http.Error(w, "unsupported method", http.StatusBadRequest)
+}
+
+func localDialer(ctx context.Context, network, addr string) (net.Conn, error) {
+	ip := getLocalIP()
+	laddr := &net.TCPAddr{
+		IP:   net.ParseIP(ip),
+		Port: 0,
+	}
+
+	dialer := &net.Dialer{
+		LocalAddr: laddr,
+		Timeout:   10 * time.Second,
+	}
+	return dialer.DialContext(ctx, network, addr)
+}
+
+func handleHTTP(w http.ResponseWriter, r *http.Request) {
+	r.Header.Del("proxy-connection")
+	r.Header.Del("proxy-authorization")
+	tr := &http.Transport{
+		DialContext: localDialer,
+	}
+	resp, err := tr.RoundTrip(r)
+	if err != nil {
+		log.Errorln(err)
+		http.Error(w, err.Error(), http.StatusServiceUnavailable)
+		return
+	}
+	defer resp.Body.Close()
+
+	hdr := w.Header()
+	resp.Header.Del("connection")
+
+	for k, v := range resp.Header {
+		for _, v1 := range v {
+			hdr.Add(k, v1)
+		}
+	}
+
+	w.WriteHeader(resp.StatusCode)
+	io.Copy(w, resp.Body)
+}
+
+func handleConnect(w http.ResponseWriter, r *http.Request) {
+	ip := getLocalIP()
+
+	log.Debugf("connect to %s, use local ip %s", r.RequestURI, ip)
+
+	addr := &net.TCPAddr{
+		IP:   net.ParseIP(ip),
+		Port: 0,
+	}
+
+	dialer := &net.Dialer{
+		LocalAddr: addr,
+		Timeout:   10 * time.Second,
+	}
+
+	conn, err := dialer.Dial("tcp", r.RequestURI)
+	if err != nil {
+		log.Errorln(err)
+		http.Error(w, "connection failed", http.StatusBadGateway)
+		return
+	}
+
+	defer conn.Close()
+
+	hj := w.(http.Hijacker)
+	conn1, _, _ := hj.Hijack()
+	defer conn1.Close()
+
+	fmt.Fprintf(conn1, "HTTP/1.1 200 connection ok\r\n\r\n")
+
+	ch := make(chan struct{}, 2)
+	go func() {
+		io.Copy(conn, conn1)
+		ch <- struct{}{}
+	}()
+
+	go func() {
+		io.Copy(conn1, conn)
+		ch <- struct{}{}
+	}()
+	<-ch
+}
+
+type handler struct {
+}
+
+func (h *handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	proxyHandler(w, r)
+}

ip.txt

@@ -0,0 +1,4 @@
+127.0.0.1
+192.168.56.1
+192.168.0.12
+172.17.0.1

main.go

@@ -0,0 +1,94 @@
+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"math/rand"
+	"net/http"
+	"os"
+	"strings"
+	"time"
+
+	log "github.com/fangdingjun/go-log/v5"
+	"gopkg.in/yaml.v2"
+)
+
+var iplist = []string{}
+
+// Conf config file
+type Conf struct {
+	Port     int    `yaml:"port"`
+	ListFile string `yaml:"ip_list"`
+}
+
+func main() {
+	var cfg Conf
+	var cfgfile string
+	var logfile string
+	var loglevel string
+
+	flag.StringVar(&cfgfile, "c", "config.yaml", "config file")
+	flag.StringVar(&logfile, "log_file", "", "log file")
+	flag.StringVar(&loglevel, "log_level", "INFO", "log level")
+	flag.Parse()
+
+	lv, err := log.ParseLevel(loglevel)
+	if err != nil {
+		fmt.Printf("wrong level name: %s\nvalid level name: DEBUG, INFO, WARN, ERROR, FATAL\n", err)
+		os.Exit(1)
+	}
+	log.Default.Level = lv
+
+	if logfile != "" {
+		log.Default.Out = &log.FixedSizeFileWriter{
+			Name:     logfile,
+			MaxSize:  10 * 1024 * 1024,
+			MaxCount: 4,
+		}
+	}
+
+	rand.Seed(time.Now().Unix())
+
+	data, err := ioutil.ReadFile(cfgfile)
+	if err != nil {
+		log.Fatal(err)
+	}
+	if err = yaml.Unmarshal(data, &cfg); err != nil {
+		log.Fatal(err)
+	}
+	loadIPList(cfg.ListFile)
+
+	log.Printf("Listen at http://0.0.0.0:%d", cfg.Port)
+
+	if err = http.ListenAndServe(fmt.Sprintf(":%d", cfg.Port), &handler{}); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func loadIPList(f string) {
+	fp, err := os.Open(f)
+	if err != nil {
+		log.Errorln(err)
+		return
+	}
+	defer fp.Close()
+
+	r := bufio.NewReader(fp)
+	for {
+		line, err := r.ReadString('\n')
+		if err != nil {
+			if err != io.EOF {
+				log.Errorln(err)
+			}
+			break
+		}
+		line = strings.Trim(line, " \r\n\t")
+		if line == "" || line[0] == '#' {
+			continue
+		}
+		iplist = append(iplist, line)
+	}
+}