/*
* Hearbeating to ensure our connection ngrokd is still live
*/
func heartbeat(lastPongAddr *int64, c conn.Conn) {
lastPing := time.Unix(atomic.LoadInt64(lastPongAddr)-1, 0)
ping := time.NewTicker(pingInterval)
pongCheck := time.NewTicker(time.Second)
defer func() {
c.Close()
ping.Stop()
pongCheck.Stop()
}()
for {
select {
case <-pongCheck.C:
lastPong := time.Unix(0, atomic.LoadInt64(lastPongAddr))
needPong := lastPong.Sub(lastPing) < 0
pongLatency := time.Since(lastPing)
if needPong && pongLatency > maxPongLatency {
c.Info("Last ping: %v, Last pong: %v", lastPing, lastPong)
c.Info("Connection stale, haven't gotten PongMsg in %d seconds", int(pongLatency.Seconds()))
return
}
case <-ping.C:
err := msg.WriteMsg(c, &msg.PingMsg{})
if err != nil {
c.Debug("Got error %v when writing PingMsg", err)
return
}
lastPing = time.Now()
}
}
}
// Handles a new http connection from the public internet
func httpHandler(c conn.Conn, proto string) {
defer c.Close()
defer func() {
// recover from failures
if r := recover(); r != nil {
c.Warn("httpHandler failed with error %v", r)
}
}()
// Make sure we detect dead connections while we decide how to multiplex
c.SetDeadline(time.Now().Add(connReadTimeout))
// multiplex by extracting the Host header, the vhost library
vhostConn, err := vhost.HTTP(c)
if err != nil {
c.Warn("Failed to read valid %s request: %v", proto, err)
c.Write([]byte(BadRequest))
return
}
// read out the Host header and auth from the request
host := strings.ToLower(vhostConn.Host())
auth := vhostConn.Request.Header.Get("Authorization")
// done reading mux data, free up the request memory
vhostConn.Free()
// We need to read from the vhost conn now since it mucked around reading the stream
c = conn.Wrap(vhostConn, "pub")
// multiplex to find the right backend host
c.Debug("Found hostname %s in request", host)
tunnel := tunnelRegistry.Get(fmt.Sprintf("%s://%s", proto, host))
if tunnel == nil {
tunnel = tunnelRegistry.Get(fmt.Sprintf("%s://%s%s", proto, host, opts.httpAddr))
}
if tunnel == nil {
c.Info("No tunnel found for hostname %s", host)
c.Write([]byte(fmt.Sprintf(NotFound, len(host)+18, host)))
return
}
// If the client specified http auth and it doesn't match this request's auth
// then fail the request with 401 Not Authorized and request the client reissue the
// request with basic authdeny the request
if tunnel.req.HttpAuth != "" && auth != tunnel.req.HttpAuth {
c.Info("Authentication failed: %s", auth)
c.Write([]byte(NotAuthorized))
return
}
// dead connections will now be handled by tunnel heartbeating and the client
c.SetDeadline(time.Time{})
// let the tunnel handle the connection now
tunnel.HandlePublicConnection(c)
}
func WriteMsg(c conn.Conn, msg interface{}) (err error) {
buffer, err := Pack(msg)
if err != nil {
return
}
c.Debug("Writing message: %s", string(buffer))
err = binary.Write(c, binary.LittleEndian, int64(len(buffer)))
if err != nil {
return
}
if _, err = c.Write(buffer); err != nil {
return
}
return nil
}
func readMsgShared(c conn.Conn) (buffer []byte, err error) {
c.Debug("Waiting to read message")
var sz int64
err = binary.Read(c, binary.LittleEndian, &sz)
if err != nil {
return
}
c.Debug("Reading message with length: %d", sz)
buffer = make([]byte, sz)
n, err := c.Read(buffer)
c.Debug("Read message %s", buffer)
if err != nil {
return
}
if int64(n) != sz {
err = errors.New(fmt.Sprintf("Expected to read %d bytes, but only read %d", sz, n))
return
}
return
}
// Handles a new http connection from the public internet
func httpHandler(c conn.Conn, proto string) {
defer c.Close()
defer func() {
// recover from failures
if r := recover(); r != nil {
c.Warn("httpHandler failed with error %v", r)
}
}()
// Make sure we detect dead connections while we decide how to multiplex
c.SetDeadline(time.Now().Add(connReadTimeout))
// multiplex by extracting the Host header, the vhost library
vhostConn, err := vhost.HTTP(c)
if err != nil {
c.Warn("Failed to read valid %s request: %v", proto, err)
c.Write([]byte(BadRequest))
return
}
// read out the Host header and auth from the request
host := strings.ToLower(vhostConn.Host())
auth := vhostConn.Request.Header.Get("Authorization")
hostname, _, err := net.SplitHostPort(host)
if err != nil {
hostname = host
} else {
_, port, _ := net.SplitHostPort(c.LocalAddr().String())
hostname = fmt.Sprintf("%s:%s", hostname, port)
}
paramSubdomain := vhostConn.Request.URL.Query().Get(SubDomainParamName) //url param
if paramSubdomain == "" { //user-agent
reg := regexp.MustCompile(fmt.Sprintf("%s/(\\w+)", SubDomainUserAgentName))
matches := reg.FindStringSubmatch(vhostConn.Request.UserAgent())
if len(matches) > 0 {
paramSubdomain = matches[1]
}
}
_, setCookieSubdomain := vhostConn.Request.URL.Query()[SetCookieSubDomainParamName]
subdomainCookie, err := vhostConn.Request.Cookie(SubDomainCookieName)
cookieSubdomain := ""
if err == nil {
cookieSubdomain = subdomainCookie.Value
}
// done reading mux data, free up the request memory
vhostConn.Free()
// We need to read from the vhost conn now since it mucked around reading the stream
c = conn.Wrap(vhostConn, "pub")
// multiplex to find the right backend host
c.Debug("Found hostname %s in request", host)
if paramSubdomain != "" {
hostname = fmt.Sprintf("%s.%s", paramSubdomain, hostname)
} else if cookieSubdomain != "" {
hostname = fmt.Sprintf("%s.%s", cookieSubdomain, hostname)
}
tunnelKey := fmt.Sprintf("%s://%s", proto, hostname)
tunnel := tunnelRegistry.Get(tunnelKey)
if tunnel == nil {
if setCookieSubdomain && paramSubdomain != "" {
c.Info("Set %s to Cookie for hostname %s", paramSubdomain, tunnelKey)
c.Write([]byte(fmt.Sprintf(SetCooikeResponse, len(proto)+len(hostname)+len(paramSubdomain)+48, SubDomainCookieName, paramSubdomain, proto, hostname, paramSubdomain)))
} else {
c.Info("No tunnel found for hostname %s", tunnelKey)
c.Write([]byte(fmt.Sprintf(NotFound, len(hostname)+18, hostname)))
}
return
}
// If the client specified http auth and it doesn't match this request's auth
// then fail the request with 401 Not Authorized and request the client reissue the
// request with basic authdeny the request
if tunnel.req.HttpAuth != "" && auth != tunnel.req.HttpAuth {
c.Info("Authentication failed: %s", auth)
c.Write([]byte(NotAuthorized))
return
}
// dead connections will now be handled by tunnel heartbeating and the client
c.SetDeadline(time.Time{})
// let the tunnel handle the connection now
tunnel.HandlePublicConnection(c)
}
