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main.go
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main.go
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package main
import (
"flag"
"fmt"
"github.com/esrrhs/gohome/common"
"github.com/esrrhs/gohome/geoip"
"github.com/esrrhs/gohome/loggo"
"github.com/esrrhs/gohome/network"
"io"
"math/rand"
"net"
"strconv"
"strings"
)
var listen = flag.String("l", ":1080", "listen addr")
var servers = flag.String("s", "server1 server2 server3", "server addr")
var sel = flag.String("select", "robin", "select server robin/rand/hash_by_dst_ip/hash_by_src_ip/hash_all")
var skip = flag.String("skip", "CN", "skip country")
var filename = flag.String("file", "GeoLite2-Country.mmdb", "ip file")
var loglevel = flag.String("loglevel", "info", "log level")
var nolog = flag.Int("nolog", 0, "write log file")
var noprint = flag.Int("noprint", 0, "print stdout")
func main() {
flag.Parse()
if *servers == "" || *servers == "server1 server2 server3" {
fmt.Print("need servers\n")
flag.Usage()
return
}
level := loggo.LEVEL_INFO
if loggo.NameToLevel(*loglevel) >= 0 {
level = loggo.NameToLevel(*loglevel)
}
loggo.Ini(loggo.Config{
Level: level,
Prefix: "socksfilter",
MaxDay: 3,
NoLogFile: *nolog > 0,
NoPrint: *noprint > 0,
})
loggo.Info("start...")
err := geoip.Load(*filename)
if err != nil {
loggo.Error("Load Sock5 ip file ERROR: %s", err.Error())
return
}
tcpaddr, err := net.ResolveTCPAddr("tcp", *listen)
if err != nil {
loggo.Error("listen fail %s", err)
return
}
tcplistenConn, err := net.ListenTCP("tcp", tcpaddr)
if err != nil {
loggo.Error("Error listening for tcp packets: %s", err)
return
}
loggo.Info("listen ok %s", tcpaddr.String())
for {
conn, err := tcplistenConn.AcceptTCP()
if err != nil {
loggo.Info("Error accept tcp %s", err)
continue
}
go process(conn)
}
}
func need_proxy(addr string) bool {
taddr, err := net.ResolveTCPAddr("tcp", addr)
if err != nil {
return false
}
ret, err := geoip.GetCountryIsoCode(taddr.IP.String())
if err != nil {
return false
}
if len(ret) <= 0 {
return false
}
return ret != *skip
}
func process(conn *net.TCPConn) {
defer common.CrashLog()
var err error = nil
if err = network.Sock5HandshakeBy(conn, "", ""); err != nil {
loggo.Error("process socks handshake: %s", err)
conn.Close()
return
}
_, targetAddr, err := network.Sock5GetRequest(conn)
if err != nil {
loggo.Error("process error getting request: %s", err)
conn.Close()
return
}
// Sending connection established message immediately to client.
// This some round trip time for creating socks connection with the client.
// But if connection failed, the client will get connection reset error.
_, err = conn.Write([]byte{0x05, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x08, 0x43})
if err != nil {
loggo.Error("process send connection confirmation: %s", err)
conn.Close()
return
}
loggo.Info("process accept new sock5 conn: %s", targetAddr)
if need_proxy(targetAddr) {
process_proxy(conn, targetAddr)
} else {
process_direct(conn, targetAddr)
}
}
func process_proxy_server(conn *net.TCPConn, targetAddr string, server string) bool {
tcpaddrProxy, err := net.ResolveTCPAddr("tcp", server)
if err != nil {
loggo.Info("process_proxy_server tcp ResolveTCPAddr fail: %s %s", server, err.Error())
return false
}
proxyconn, err := net.DialTCP("tcp", nil, tcpaddrProxy)
if err != nil {
loggo.Info("process_proxy_server tcp DialTCP fail: %s %s", targetAddr, err.Error())
return false
}
tcpsrcaddr := conn.RemoteAddr().(*net.TCPAddr)
err = network.Sock5Handshake(proxyconn, 0, "", "")
if err != nil {
loggo.Info("process_proxy_server Sock5Handshake fail: %s %s", targetAddr, err.Error())
return false
}
dsthost, dstportstr, err := net.SplitHostPort(targetAddr)
if err != nil {
loggo.Info("process_proxy_server SplitHostPort error: %s", err)
return false
}
dstport, err := strconv.Atoi(dstportstr)
if err != nil {
loggo.Info("process_proxy_server Atoi error: %s", err)
return false
}
err = network.Sock5SetRequest(proxyconn, dsthost, dstport, 0)
if err != nil {
loggo.Info("process_proxy_server Sock5SetRequest fail: %s %s", targetAddr, err.Error())
return false
}
loggo.Info("client accept new proxy local tcp %s %s %s", server, tcpsrcaddr.String(), targetAddr)
errCh := make(chan error, 2)
go proxy(conn, proxyconn, conn.RemoteAddr().String(), proxyconn.RemoteAddr().String(), errCh)
go proxy(proxyconn, conn, proxyconn.RemoteAddr().String(), conn.RemoteAddr().String(), errCh)
for i := 0; i < 2; i++ {
<-errCh
}
conn.Close()
proxyconn.Close()
return true
}
func process_proxy(conn *net.TCPConn, targetAddr string) {
ss := strings.Fields(*servers)
if len(ss) <= 0 {
loggo.Error("process_proxy no servers fail: %s", targetAddr)
return
}
if *sel == "robin" {
for _, server := range ss {
if process_proxy_server(conn, targetAddr, server) {
return
}
}
} else if *sel == "rand" {
rand.Shuffle(len(ss), func(i, j int) {
ss[i], ss[j] = ss[j], ss[i]
})
for _, server := range ss {
if process_proxy_server(conn, targetAddr, server) {
return
}
}
} else if *sel == "hash_by_dst_ip" {
dsthost, _, err := net.SplitHostPort(targetAddr)
if err != nil {
loggo.Info("process_proxy SplitHostPort error: %s", err)
return
}
hash := int(common.HashString(dsthost))
for i := 0; i < len(ss); i++ {
server := ss[(hash+i)%len(ss)]
if process_proxy_server(conn, targetAddr, server) {
return
}
}
} else if *sel == "hash_by_src_ip" {
hash := int(common.HashString(conn.RemoteAddr().(*net.TCPAddr).IP.String()))
for i := 0; i < len(ss); i++ {
server := ss[(hash+i)%len(ss)]
if process_proxy_server(conn, targetAddr, server) {
return
}
}
} else if *sel == "hash_all" {
hash := int(common.HashString(conn.RemoteAddr().String() + "-" + targetAddr))
for i := 0; i < len(ss); i++ {
server := ss[(hash+i)%len(ss)]
if process_proxy_server(conn, targetAddr, server) {
return
}
}
} else {
loggo.Error("process_proxy select type error: %s", *sel)
}
loggo.Info("process_proxy no valid servers fail: %s", *servers)
}
func process_direct(conn *net.TCPConn, targetAddr string) {
tcpaddrTarget, err := net.ResolveTCPAddr("tcp", targetAddr)
if err != nil {
loggo.Info("process_direct tcp ResolveTCPAddr fail: %s %s", targetAddr, err.Error())
return
}
targetconn, err := net.DialTCP("tcp", nil, tcpaddrTarget)
if err != nil {
loggo.Info("process_direct tcp DialTCP fail: %s %s", targetAddr, err.Error())
return
}
tcpsrcaddr := conn.RemoteAddr().(*net.TCPAddr)
loggo.Info("process_direct client accept new direct local tcp %s %s", tcpsrcaddr.String(), targetAddr)
errCh := make(chan error, 2)
go proxy(conn, targetconn, conn.RemoteAddr().String(), targetconn.RemoteAddr().String(), errCh)
go proxy(targetconn, conn, targetconn.RemoteAddr().String(), conn.RemoteAddr().String(), errCh)
for i := 0; i < 2; i++ {
<-errCh
}
conn.Close()
targetconn.Close()
}
func proxy(destination io.Writer, source io.Reader, dst string, src string, errCh chan error) {
loggo.Info("transfer client begin transfer from %s -> %s", src, dst)
n, err := io.Copy(destination, source)
errCh <- err
loggo.Info("transfer client end transfer from %s -> %s %v %v", src, dst, n, err)
}