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//
// sfive
//
// sfive - spreadspace streaming statistics suite is a generic
// statistic collection tool for streaming server infrastuctures.
// The system collects and stores meta data like number of views
// and throughput from a number of streaming servers and stores
// it in a global data store.
// The data acquisition is designed to be generic and extensible in
// order to support different streaming software.
// sfive also contains tools and applications to filter and visualize
// live and recorded data.
//
//
// Copyright (C) 2014-2017 Christian Pointner <equinox@spreadspace.org>
// Markus Grüneis <gimpf@gimpf.org>
//
// This file is part of sfive.
//
// sfive is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 3
// as published by the Free Software Foundation.
//
// sfive is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with sfive. If not, see <http://www.gnu.org/licenses/>.
//
package main
import (
"crypto/tls"
"net"
"net/http"
"net/http/httputil"
"net/url"
"strings"
"time"
"github.com/soheilhy/cmux"
)
func generateTime(input string) string {
d, err := time.ParseDuration(input)
if err != nil {
s5l.Printf("PROXY: can't parse duration: %v", err)
return ""
}
return time.Now().Add(d).Format(time.RFC1123)
}
type s5proxyResponseWriter struct {
wrapped http.ResponseWriter
conf *Config
StatsCh chan<- *Client
IP string
Port int
UserAgent string
}
func (r s5proxyResponseWriter) Header() http.Header {
return r.wrapped.Header()
}
func (r s5proxyResponseWriter) Write(data []byte) (int, error) {
sent, err := r.wrapped.Write(data)
if r.StatsCh != nil {
stats := &Client{IP: r.IP, Port: uint(r.Port), UserAgent: r.UserAgent, BytesSent: uint(sent)}
select {
case r.StatsCh <- stats:
default:
}
}
return sent, err
}
func (r s5proxyResponseWriter) WriteHeader(status int) {
for _, h := range r.conf.ResponseHeader {
switch h.Operation {
case OpAdd:
r.wrapped.Header().Add(h.Header, h.Value)
case OpDel:
r.wrapped.Header().Del(h.Header)
case OpSet:
r.wrapped.Header().Set(h.Header, h.Value)
case OpTime:
if ts := generateTime(h.Value); ts != "" {
r.wrapped.Header().Set(h.Header, ts)
}
}
}
r.wrapped.WriteHeader(status)
}
func proxyHandler(p *Proxy, w http.ResponseWriter, r *http.Request) {
pw := s5proxyResponseWriter{wrapped: w, conf: p.conf}
if p.stats != nil {
if ip, port, err := net.SplitHostPort(r.RemoteAddr); err != nil {
s5l.Printf("PROXY: client '%s' error: invalid address/port info: %v, no statistics will be gathered", r.RemoteAddr, err)
} else {
pw.IP = ip
if pw.Port, err = net.LookupPort("tcp", port); err != nil {
s5l.Printf("PROXY: client '%s' warning: can't parse port or service name: %v", r.RemoteAddr, err)
}
pw.UserAgent = r.UserAgent()
pw.StatsCh = p.stats.GetUpdateChannel(r.URL.String())
}
}
p.proxy.ServeHTTP(pw, r)
}
type Proxy struct {
conf *Config
stats *Stats
proxy *httputil.ReverseProxy
mux *http.ServeMux
srv *http.Server
}
func NewProxy(conf *Config, stats *Stats) (p *Proxy, err error) {
p = &Proxy{conf: conf, stats: stats}
var remote *url.URL
remote, err = url.Parse(conf.ConnectAddr)
if err != nil {
return
}
s5l.Printf("PROXY: forwarding traffic to '%s'", remote.String())
p.proxy = httputil.NewSingleHostReverseProxy(remote)
origDir := p.proxy.Director
p.proxy.Director = func(req *http.Request) {
origDir(req)
for _, h := range conf.RequestHeader {
switch h.Operation {
case OpAdd:
req.Header.Add(h.Header, h.Value)
case OpDel:
req.Header.Del(h.Header)
case OpSet:
req.Header.Set(h.Header, h.Value)
case OpTime:
if ts := generateTime(h.Value); ts != "" {
req.Header.Set(h.Header, ts)
}
}
}
}
p.mux = http.NewServeMux()
p.mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
proxyHandler(p, w, r)
})
p.srv = &http.Server{
Handler: p.mux,
}
return
}
type httpsRedirectHandler struct {
code int
}
func (h *httpsRedirectHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
uri := *r.URL
uri.Scheme = "https"
uri.Host = r.Host
http.Redirect(w, r, uri.String(), h.code)
}
func (p *Proxy) RunHTTP(l net.Listener) error {
mux := http.NewServeMux()
mux.Handle("/", &httpsRedirectHandler{http.StatusTemporaryRedirect}) // TODO: make redirect code configurable
srv := &http.Server{
Handler: mux,
}
return srv.Serve(l)
}
func (p *Proxy) RunHTTPS(l net.Listener) error {
cert, err := tls.LoadX509KeyPair(p.conf.CertFile, p.conf.KeyFile)
if err != nil {
return err
}
// TODO: make this configurable
cfg := &tls.Config{
Certificates: []tls.Certificate{cert},
MinVersion: tls.VersionTLS10,
CurvePreferences: []tls.CurveID{tls.CurveP521, tls.CurveP384, tls.CurveP256},
PreferServerCipherSuites: true,
CipherSuites: []uint16{
tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
tls.TLS_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_RSA_WITH_AES_256_CBC_SHA,
},
}
tlsL := tls.NewListener(l, cfg)
return p.srv.Serve(tlsL)
}
func (p *Proxy) Run() error {
s5l.Printf("PROXY: listening on '%s'", p.conf.ListenAddr)
l, err := net.Listen("tcp", p.conf.ListenAddr)
if err != nil {
return err
}
m := cmux.New(l)
httpL := m.Match(cmux.HTTP1Fast())
httpsL := m.Match(cmux.Any())
go p.RunHTTP(httpL)
go p.RunHTTPS(httpsL)
if err := m.Serve(); !strings.Contains(err.Error(), "use of closed network connection") {
return err
}
return nil
}
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