Move nginx to root directory

pkg/cmd/controller/tcp.go

@@ -0,0 +1,110 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"net"
+
+	"github.com/golang/glog"
+
+	"github.com/paultag/sniff/parser"
+)
+
+type server struct {
+	Hostname      string
+	IP            string
+	Port          int
+	ProxyProtocol bool
+}
+
+type proxy struct {
+	ServerList []*server
+	Default    *server
+}
+
+func (p *proxy) Get(host string) *server {
+	if p.ServerList == nil {
+		return p.Default
+	}
+
+	for _, s := range p.ServerList {
+		if s.Hostname == host {
+			return s
+		}
+	}
+
+	return p.Default
+}
+
+func (p *proxy) Handle(conn net.Conn) {
+	defer conn.Close()
+	data := make([]byte, 4096)
+
+	length, err := conn.Read(data)
+	if err != nil {
+		glog.V(4).Infof("error reading the first 4k of the connection: %s", err)
+		return
+	}
+
+	proxy := p.Default
+	hostname, err := parser.GetHostname(data[:])
+	if err == nil {
+		glog.V(4).Infof("parsed hostname from TLS Client Hello: %s", hostname)
+		proxy = p.Get(hostname)
+	}
+
+	if proxy == nil {
+		glog.V(4).Infof("there is no configured proxy for SSL connections")
+		return
+	}
+
+	clientConn, err := net.Dial("tcp", fmt.Sprintf("%s:%d", proxy.IP, proxy.Port))
+	if err != nil {
+		return
+	}
+	defer clientConn.Close()
+
+	if proxy.ProxyProtocol {
+		//Write out the proxy-protocol header
+		localAddr := conn.LocalAddr().(*net.TCPAddr)
+		remoteAddr := conn.RemoteAddr().(*net.TCPAddr)
+		protocol := "UNKNOWN"
+		if remoteAddr.IP.To4() != nil {
+			protocol = "TCP4"
+		} else if remoteAddr.IP.To16() != nil {
+			protocol = "TCP6"
+		}
+		proxyProtocolHeader := fmt.Sprintf("PROXY %s %s %s %d %d\r\n", protocol, remoteAddr.IP.String(), localAddr.IP.String(), remoteAddr.Port, localAddr.Port)
+		glog.V(4).Infof("Writing proxy protocol header - %s", proxyProtocolHeader)
+		_, err = fmt.Fprintf(clientConn, proxyProtocolHeader)
+	}
+	if err != nil {
+		glog.Errorf("unexpected error writing proxy-protocol header: %s", err)
+		clientConn.Close()
+	} else {
+		_, err = clientConn.Write(data[:length])
+		if err != nil {
+			glog.Errorf("unexpected error writing first 4k of proxy data: %s", err)
+			clientConn.Close()
+		}
+	}
+
+	pipe(clientConn, conn)
+}
+
+func pipe(client, server net.Conn) {
+	doCopy := func(s, c net.Conn, cancel chan<- bool) {
+		io.Copy(s, c)
+		cancel <- true
+	}
+
+	cancel := make(chan bool, 2)
+
+	go doCopy(server, client, cancel)
+	go doCopy(client, server, cancel)
+
+	select {
+	case <-cancel:
+		return
+	}
+}