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tlsrouter | ||
tlsrouter.test |
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package main | ||
|
||
import ( | ||
"bufio" | ||
"fmt" | ||
"io" | ||
"os" | ||
"regexp" | ||
"strings" | ||
"sync" | ||
) | ||
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type Route struct { | ||
match *regexp.Regexp | ||
backend string | ||
} | ||
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// Config stores the TLS routing configuration. | ||
type Config struct { | ||
mu sync.Mutex | ||
routes []Route | ||
} | ||
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func dnsRegex(s string) (*regexp.Regexp, error) { | ||
return regexp.Compile(s) | ||
} | ||
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func (c *Config) Match(hostname string) string { | ||
c.mu.Lock() | ||
defer c.mu.Unlock() | ||
for _, r := range c.routes { | ||
if r.match.MatchString(hostname) { | ||
return r.backend | ||
} | ||
} | ||
return "" | ||
} | ||
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func (c *Config) Read(r io.Reader) error { | ||
var routes []Route | ||
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s := bufio.NewScanner(r) | ||
for s.Scan() { | ||
fs := strings.Fields(s.Text()) | ||
switch len(fs) { | ||
case 0: | ||
continue | ||
case 1: | ||
return fmt.Errorf("invalid %q on a line by itself", s.Text()) | ||
case 2: | ||
re, err := dnsRegex(fs[0]) | ||
if err != nil { | ||
return err | ||
} | ||
routes = append(routes, Route{re, fs[1]}) | ||
default: | ||
// TODO: multiple backends? | ||
return fmt.Errorf("too many fields on line: %q", s.Text()) | ||
} | ||
} | ||
if err := s.Err(); err != nil { | ||
return err | ||
} | ||
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c.mu.Lock() | ||
defer c.mu.Unlock() | ||
c.routes = routes | ||
return nil | ||
} | ||
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func (c *Config) ReadFile(path string) error { | ||
f, err := os.Open(path) | ||
if err != nil { | ||
return err | ||
} | ||
return c.Read(f) | ||
} |
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package main | ||
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import ( | ||
"bytes" | ||
"flag" | ||
"fmt" | ||
"io" | ||
"log" | ||
"net" | ||
"sync" | ||
"time" | ||
) | ||
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var cfgFile = flag.String("conf", "", "configuration file") | ||
var listen = flag.String("listen", ":443", "listening port") | ||
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var config Config | ||
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func main() { | ||
flag.Parse() | ||
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if err := config.ReadFile(*cfgFile); err != nil { | ||
log.Fatalf("Failed to read config %q: %s", *cfgFile, err) | ||
} | ||
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l, err := net.Listen("tcp", *listen) | ||
if err != nil { | ||
log.Fatalf("Failed to listen: %s", err) | ||
} | ||
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for { | ||
c, err := l.Accept() | ||
if err != nil { | ||
log.Fatalf("Error while accepting: %s", err) | ||
} | ||
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conn := &Conn{TCPConn: c.(*net.TCPConn)} | ||
go conn.proxy() | ||
} | ||
} | ||
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type Conn struct { | ||
*net.TCPConn | ||
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tlsMinor int | ||
hostname string | ||
backend string | ||
backendConn *net.TCPConn | ||
} | ||
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func (c *Conn) log(msg string, args ...interface{}) { | ||
msg = fmt.Sprintf(msg, args...) | ||
log.Printf("%s <> %s: %s", c.RemoteAddr(), c.LocalAddr(), msg) | ||
} | ||
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func (c *Conn) abort(alert byte, msg string, args ...interface{}) { | ||
c.log(msg, args...) | ||
alertMsg := []byte{21, 3, byte(c.tlsMinor), 0, 2, 2, alert} | ||
if _, err := c.Write(alertMsg); err != nil { | ||
c.log("error while sending alert: %s", err) | ||
} | ||
} | ||
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func (c *Conn) internalError(msg string, args ...interface{}) { c.abort(80, msg, args...) } | ||
func (c *Conn) sniFailed(msg string, args ...interface{}) { c.abort(112, msg, args...) } | ||
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func (c *Conn) proxy() { | ||
defer c.Close() | ||
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var ( | ||
err error | ||
handshakeBuf bytes.Buffer | ||
) | ||
c.hostname, c.tlsMinor, err = extractSNI(io.TeeReader(c, &handshakeBuf)) | ||
if err != nil { | ||
c.internalError("Extracting SNI: %s", err) | ||
return | ||
} | ||
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c.backend = config.Match(c.hostname) | ||
if c.backend == "" { | ||
c.sniFailed("no backend found for %q", c.hostname) | ||
return | ||
} | ||
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c.log("routing %q to %q", c.hostname, c.backend) | ||
backend, err := net.DialTimeout("tcp", c.backend, 10*time.Second) | ||
if err != nil { | ||
c.internalError("failed to dial backend %q for %q: %s", c.backend, c.hostname, err) | ||
return | ||
} | ||
defer backend.Close() | ||
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c.backendConn = backend.(*net.TCPConn) | ||
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// Replay the piece of the handshake we had to read to do the | ||
// routing, then blindly proxy any other bytes. | ||
if _, err = io.Copy(c.backendConn, &handshakeBuf); err != nil { | ||
c.internalError("failed to replay handshake to %q: %s", c.backend, err) | ||
return | ||
} | ||
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var wg sync.WaitGroup | ||
wg.Add(2) | ||
go proxy(&wg, c.TCPConn, c.backendConn) | ||
go proxy(&wg, c.backendConn, c.TCPConn) | ||
wg.Wait() | ||
} | ||
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func proxy(wg *sync.WaitGroup, a, b net.Conn) { | ||
defer wg.Done() | ||
atcp, btcp := a.(*net.TCPConn), b.(*net.TCPConn) | ||
if _, err := io.Copy(atcp, btcp); err != nil { | ||
log.Printf("%s<>%s -> %s<>%s: %s", atcp.RemoteAddr(), atcp.LocalAddr(), btcp.LocalAddr(), btcp.RemoteAddr(), err) | ||
} | ||
btcp.CloseWrite() | ||
atcp.CloseRead() | ||
} |
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