aboutsummaryrefslogtreecommitdiff
path: root/server.go
blob: 3437590502bfe52e4e22c8ccfb7ccc35dbcd19ee (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
package goxy

import (
	"crypto/tls"
	"crypto/x509"
	"fmt"
	"net/http"
	"net/http/httputil"
	"net/url"
)

type Server struct {
	DataFile string
	Routes
	SNI
	wwwServer http.Server
	tlsServer http.Server
	rpcServer http.Server
}

// SNI holds certificates
type SNI map[string]*tls.Certificate

// GetCertificate returns certificate for SNI negotiation
func (s SNI) getCertificate(h *tls.ClientHelloInfo) (*tls.Certificate, error) {
	if v, ok := s[h.ServerName]; ok {
		return v, nil
	}
	return nil, fmt.Errorf("no cert for %q", h.ServerName)
}

func (s SNI) addCertificate(cert, key []byte) error {
	c, err := tls.X509KeyPair(cert, key)
	if err != nil {
		return err
	}
	c.Leaf, err = x509.ParseCertificate(c.Certificate[0])
	if err != nil {
		return err
	}
	if cn := c.Leaf.Subject.CommonName; cn != "" {
		s[cn] = &c
	}
	for _, name := range c.Leaf.DNSNames {
		s[name] = &c
	}
	for _, ip := range c.Leaf.IPAddresses {
		s[ip.String()] = &c
	}
	return nil
}

func NewServer(dataFile, listenWWW, listenTLS, listenRPC string) (*Server, error) {
	if listenRPC == "" {
		listenRPC = RPCPort
	}
	server := &Server{
		DataFile:  dataFile,
		Routes:    make(Routes),
		SNI:       make(SNI),
		wwwServer: http.Server{Addr: listenWWW},
		tlsServer: http.Server{Addr: listenTLS},
		rpcServer: http.Server{Addr: listenRPC},
	}
	server.tlsServer.TLSConfig = &tls.Config{
		GetCertificate: server.getCertificate,
	}
	if dataFile != "" {
		server.Load(dataFile)
	}
	registerRPC(server)
	http.Handle("/debug/route", server)
	return server, server.UpdateMux()
}

func NewRedirect(host string) http.Handler {
	return http.RedirectHandler(host, http.StatusMovedPermanently)
}

func NewReverseProxy(target *url.URL) *httputil.ReverseProxy {
	return httputil.NewSingleHostReverseProxy(target)
}

// Update routes from in-memory state
func (s *Server) UpdateMux() error {
	wwwMux := http.NewServeMux()
	tlsMux := http.NewServeMux()
	for host, route := range s.Routes {
		serverName, err := url.Parse(route.Host)
		if err != nil {
			return err
		}
		upstream, err := url.Parse(route.Upstream)
		if err != nil {
			return err
		}
		switch serverName.Scheme {
		case "http", "":
			wwwMux.Handle(host, NewReverseProxy(upstream))
		case "https":
			err := s.SNI.addCertificate(route.Cert, route.Key)
			if err != nil {
				return err
			}
			tlsMux.Handle(host, NewReverseProxy(upstream))
			wwwMux.Handle(host, NewRedirect("https://"+host))
		case "ws":
			wwwMux.Handle(host, NewWebSocketProxy(upstream))
		case "wss":
			err := s.SNI.addCertificate(route.Cert, route.Key)
			if err != nil {
				return err
			}
			tlsMux.Handle(host, NewWebSocketProxy(upstream))
			wwwMux.Handle(host, NewRedirect("wss://"+host))
		}
	}
	s.wwwServer.Handler = wwwMux
	s.tlsServer.Handler = tlsMux
	return nil
}

func (s *Server) Start() error {
	errc := make(chan error)
	go func() { errc <- s.wwwServer.ListenAndServe() }()
	go func() { errc <- s.tlsServer.ListenAndServeTLS("", "") }()
	go func() { errc <- s.rpcServer.ListenAndServe() }()
	return <-errc
}