2 files changed, 121 insertions, 0 deletions
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..890abcf
--- /dev/null
+++ b/README.md
@@ -0,0 +1,10 @@
+# gProxy
+Simple multi-use TCP proxy written in golang.
+
+# Usage
+```
+./gProxy -r [remote ip] (-l [local ip]) (-d)
+```
+-r: remote ip for the proxy to connect to  
+-l: local ip for the proxy to listen at (Optional)  
+-d: enables debug info (Optional)  
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..3bb4ac9
--- /dev/null
+++ b/main.go
@@ -0,0 +1,111 @@
+package main
+
+import (
+	"encoding/hex"
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net"
+	"os"
+)
+
+func main() {
+	log.SetPrefix("gProxy: ")
+	fmt.Println("Starting gProxy...")
+
+	var localAddr string
+	var remoteAddr string
+
+	getArgs(&localAddr, &remoteAddr)
+
+	addr, err := net.ResolveTCPAddr("tcp", localAddr)
+	if err != nil {
+		panic(err)
+	}
+
+	listener, err := net.ListenTCP("tcp", addr)
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println("Listening for connections...")
+
+	for {
+		conn, err := listener.AcceptTCP()
+		if err != nil {
+			panic(err)
+		}
+		go proxyConn(conn, remoteAddr)
+	}
+}
+
+func proxyConn(conn *net.TCPConn, remoteAddr string) {
+	fmt.Println("New connection from", conn.RemoteAddr())
+
+	defer conn.Close()
+
+	rAddr, err := net.ResolveTCPAddr("tcp", remoteAddr)
+	if err != nil {
+		panic(err)
+	}
+
+	rConn, err := net.DialTCP("tcp", nil, rAddr)
+	if err != nil {
+		panic(err)
+	}
+
+	defer rConn.Close()
+
+	go func() {
+		log.Println("waiting for data from client")
+		data := make([]byte, 1024)
+		for {
+			n, err := conn.Read(data)
+			if err != nil {
+				break
+			}
+			_, err = rConn.Write(data[:n])
+			if err != nil {
+				break
+			}
+			log.Printf("sent:\n%v\nend of send\n", hex.Dump(data[:n]))
+		}
+	}()
+
+	data := make([]byte, 1024)
+	for {
+		n, err := rConn.Read(data)
+		if err != nil {
+			break
+		}
+		_, err = conn.Write(data[:n])
+		if err != nil {
+			break
+		}
+		log.Printf("recv:\n%v\nend of recv\n", hex.Dump(data[:n]))
+	}
+
+	fmt.Println("Closed connection from", conn.RemoteAddr())
+}
+
+func getArgs(localAddr *string, remoteAddr *string) {
+	flag.StringVar(localAddr, "l", "0.0.0.0:9999", "local address")
+	flag.StringVar(remoteAddr, "r", "", "remote address")
+	var dbg = flag.Bool("d", false, "debug info")
+
+	flag.Parse()
+
+	if *remoteAddr == "" {
+		usage()
+		os.Exit(1)
+	}
+
+	if *dbg == false {
+		log.SetOutput(ioutil.Discard)
+	}
+}
+
+func usage() {
+	fmt.Println("./proxy -r [remote addr] (-d)")
+}