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main.go
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main.go
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package main
import (
"flag"
"fmt"
"io"
"log"
"net"
"github.com/xhebox/sbutils/lib/packet"
)
func Callback(r *Filter, p packet.Packet) {
fmt.Printf("%+v\n", p)
}
var laddr, saddr, mode string
func forward(conn net.Conn) {
rconn, err := net.Dial("tcp", saddr)
if err != nil {
log.Fatalln("dial failed: ", err)
}
log.Println("connected to: ", rconn.RemoteAddr())
switch mode {
case "all":
p := NewFilter(conn, rconn, Callback)
q := NewFilter(rconn, conn, Callback)
go func() {
defer conn.Close()
defer rconn.Close()
e := p.Loop()
log.Printf("parse cs: %+v\n", e)
}()
go func() {
defer conn.Close()
defer rconn.Close()
e := q.Loop()
log.Printf("parse sc: %+v\n", e)
}()
case "client":
p := NewFilter(conn, rconn, Callback)
go func() {
defer conn.Close()
defer rconn.Close()
e := p.Loop()
log.Printf("parse cs: %+v\n", e)
}()
go func() {
io.Copy(conn, rconn)
}()
case "server":
q := NewFilter(rconn, conn, Callback)
go func() {
defer conn.Close()
defer rconn.Close()
e := q.Loop()
log.Printf("parse sc: %+v\n", e)
}()
go func() {
io.Copy(rconn, conn)
}()
default:
go func() {
defer rconn.Close()
defer conn.Close()
io.Copy(conn, rconn)
}()
go func() {
defer rconn.Close()
defer conn.Close()
io.Copy(rconn, conn)
}()
}
}
func main() {
flag.StringVar(&laddr, "l", "127.0.0.1:21026", "listened address")
flag.StringVar(&saddr, "t", "127.0.0.1:21025", "server address")
flag.StringVar(&mode, "m", "all", "could be client(filter packages from client to server)/server(filter packages from server to client)/all")
flag.Parse()
log.SetFlags(log.Lshortfile)
listener, err := net.Listen("tcp", laddr)
if err != nil {
log.Fatalln("failed to listen: ", err)
}
log.Println("listened to: ", laddr)
log.Println("forward to: ", saddr)
for {
conn, err := listener.Accept()
if err != nil {
log.Fatalln("failed to accept connection: ", err)
}
log.Println("accepted connection: ", conn.RemoteAddr())
go forward(conn)
}
}