293 lines
8.1 KiB
Go
293 lines
8.1 KiB
Go
package origin
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import (
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"bufio"
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"context"
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"fmt"
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"io"
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"net/http"
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"strconv"
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"strings"
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"github.com/pkg/errors"
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"github.com/rs/zerolog"
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"github.com/cloudflare/cloudflared/connection"
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"github.com/cloudflare/cloudflared/ingress"
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tunnelpogs "github.com/cloudflare/cloudflared/tunnelrpc/pogs"
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)
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const (
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TagHeaderNamePrefix = "Cf-Warp-Tag-"
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LogFieldCFRay = "cfRay"
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LogFieldRule = "ingressRule"
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)
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type proxy struct {
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ingressRules ingress.Ingress
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warpRouting *ingress.WarpRoutingService
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tags []tunnelpogs.Tag
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log *zerolog.Logger
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bufferPool *bufferPool
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}
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func NewOriginProxy(
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ingressRules ingress.Ingress,
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warpRouting *ingress.WarpRoutingService,
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tags []tunnelpogs.Tag,
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log *zerolog.Logger) connection.OriginProxy {
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return &proxy{
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ingressRules: ingressRules,
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warpRouting: warpRouting,
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tags: tags,
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log: log,
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bufferPool: newBufferPool(512 * 1024),
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}
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}
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// Caller is responsible for writing any error to ResponseWriter
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func (p *proxy) Proxy(w connection.ResponseWriter, req *http.Request, sourceConnectionType connection.Type) error {
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incrementRequests()
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defer decrementConcurrentRequests()
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cfRay := findCfRayHeader(req)
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lbProbe := isLBProbeRequest(req)
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serveCtx, cancel := context.WithCancel(req.Context())
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defer cancel()
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p.appendTagHeaders(req)
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if sourceConnectionType == connection.TypeTCP {
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if p.warpRouting == nil {
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err := errors.New(`cloudflared received a request from WARP client, but your configuration has disabled ingress from WARP clients. To enable this, set "warp-routing:\n\t enabled: true" in your config.yaml`)
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p.log.Error().Msg(err.Error())
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return err
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}
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logFields := logFields{
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cfRay: cfRay,
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lbProbe: lbProbe,
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rule: ingress.ServiceWarpRouting,
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}
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if err := p.proxyStreamRequest(serveCtx, w, req, p.warpRouting.Proxy, logFields); err != nil {
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p.logRequestError(err, cfRay, ingress.ServiceWarpRouting)
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return err
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}
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return nil
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}
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rule, ruleNum := p.ingressRules.FindMatchingRule(req.Host, req.URL.Path)
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logFields := logFields{
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cfRay: cfRay,
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lbProbe: lbProbe,
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rule: ruleNum,
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}
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p.logRequest(req, logFields)
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if sourceConnectionType == connection.TypeHTTP {
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if err := p.proxyHTTPRequest(w, req, rule, logFields); err != nil {
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p.logRequestError(err, cfRay, ruleField(p.ingressRules, ruleNum))
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return err
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}
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return nil
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}
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connectionProxy, ok := rule.Service.(ingress.StreamBasedOriginProxy)
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if !ok {
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p.log.Error().Msgf("%s is not a connection-oriented service", rule.Service)
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return fmt.Errorf("Not a connection-oriented service")
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}
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if err := p.proxyStreamRequest(serveCtx, w, req, connectionProxy, logFields); err != nil {
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p.logRequestError(err, cfRay, ruleField(p.ingressRules, ruleNum))
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return err
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}
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return nil
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}
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func ruleField(ing ingress.Ingress, ruleNum int) string {
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if ing.IsSingleRule() {
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return ""
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}
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return fmt.Sprintf("%d", ruleNum)
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}
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func (p *proxy) proxyHTTPRequest(w connection.ResponseWriter, req *http.Request, rule *ingress.Rule, fields logFields) error {
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// Support for WSGI Servers by switching transfer encoding from chunked to gzip/deflate
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if rule.Config.DisableChunkedEncoding {
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req.TransferEncoding = []string{"gzip", "deflate"}
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cLength, err := strconv.Atoi(req.Header.Get("Content-Length"))
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if err == nil {
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req.ContentLength = int64(cLength)
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}
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}
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// Request origin to keep connection alive to improve performance
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req.Header.Set("Connection", "keep-alive")
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httpService, ok := rule.Service.(ingress.HTTPOriginProxy)
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if !ok {
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p.log.Error().Msgf("%s is not a http service", rule.Service)
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return fmt.Errorf("Not a http service")
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}
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resp, err := httpService.RoundTrip(req)
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if err != nil {
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return errors.Wrap(err, "Error proxying request to origin")
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}
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defer resp.Body.Close()
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err = w.WriteRespHeaders(resp.StatusCode, resp.Header)
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if err != nil {
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return errors.Wrap(err, "Error writing response header")
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}
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if connection.IsServerSentEvent(resp.Header) {
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p.log.Debug().Msg("Detected Server-Side Events from Origin")
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p.writeEventStream(w, resp.Body)
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} else {
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// Use CopyBuffer, because Copy only allocates a 32KiB buffer, and cross-stream
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// compression generates dictionary on first write
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buf := p.bufferPool.Get()
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defer p.bufferPool.Put(buf)
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_, _ = io.CopyBuffer(w, resp.Body, buf)
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}
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p.logOriginResponse(resp, fields)
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return nil
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}
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// proxyStreamRequest first establish a connection with origin, then it writes the status code and headers, and finally it streams data between
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// eyeball and origin.
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func (p *proxy) proxyStreamRequest(
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serveCtx context.Context,
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w connection.ResponseWriter,
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req *http.Request,
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connectionProxy ingress.StreamBasedOriginProxy,
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fields logFields,
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) error {
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originConn, resp, err := connectionProxy.EstablishConnection(req)
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if err != nil {
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return err
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}
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if resp.Body != nil {
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defer resp.Body.Close()
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}
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if err = w.WriteRespHeaders(resp.StatusCode, resp.Header); err != nil {
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return err
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}
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streamCtx, cancel := context.WithCancel(serveCtx)
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defer cancel()
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go func() {
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// streamCtx is done if req is cancelled or if Stream returns
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<-streamCtx.Done()
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originConn.Close()
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}()
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eyeballStream := &bidirectionalStream{
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writer: w,
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reader: req.Body,
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}
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originConn.Stream(serveCtx, eyeballStream, p.log)
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p.logOriginResponse(resp, fields)
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return nil
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}
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type bidirectionalStream struct {
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reader io.Reader
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writer io.Writer
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}
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func (wr *bidirectionalStream) Read(p []byte) (n int, err error) {
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return wr.reader.Read(p)
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}
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func (wr *bidirectionalStream) Write(p []byte) (n int, err error) {
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return wr.writer.Write(p)
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}
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func (p *proxy) writeEventStream(w connection.ResponseWriter, respBody io.ReadCloser) {
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reader := bufio.NewReader(respBody)
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for {
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line, err := reader.ReadBytes('\n')
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if err != nil {
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break
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}
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_, _ = w.Write(line)
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}
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}
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func (p *proxy) appendTagHeaders(r *http.Request) {
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for _, tag := range p.tags {
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r.Header.Add(TagHeaderNamePrefix+tag.Name, tag.Value)
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}
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}
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type logFields struct {
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cfRay string
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lbProbe bool
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rule interface{}
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}
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func (p *proxy) logRequest(r *http.Request, fields logFields) {
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if fields.cfRay != "" {
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p.log.Debug().Msgf("CF-RAY: %s %s %s %s", fields.cfRay, r.Method, r.URL, r.Proto)
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} else if fields.lbProbe {
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p.log.Debug().Msgf("CF-RAY: %s Load Balancer health check %s %s %s", fields.cfRay, r.Method, r.URL, r.Proto)
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} else {
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p.log.Debug().Msgf("All requests should have a CF-RAY header. Please open a support ticket with Cloudflare. %s %s %s ", r.Method, r.URL, r.Proto)
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}
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p.log.Debug().
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Str("CF-RAY", fields.cfRay).
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Str("Header", fmt.Sprintf("%+v", r.Header)).
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Str("host", r.Host).
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Str("path", r.URL.Path).
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Interface("rule", fields.rule).
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Msg("Inbound request")
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if contentLen := r.ContentLength; contentLen == -1 {
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p.log.Debug().Msgf("CF-RAY: %s Request Content length unknown", fields.cfRay)
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} else {
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p.log.Debug().Msgf("CF-RAY: %s Request content length %d", fields.cfRay, contentLen)
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}
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}
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func (p *proxy) logOriginResponse(resp *http.Response, fields logFields) {
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responseByCode.WithLabelValues(strconv.Itoa(resp.StatusCode)).Inc()
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if fields.cfRay != "" {
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p.log.Debug().Msgf("CF-RAY: %s Status: %s served by ingress %d", fields.cfRay, resp.Status, fields.rule)
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} else if fields.lbProbe {
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p.log.Debug().Msgf("Response to Load Balancer health check %s", resp.Status)
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} else {
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p.log.Debug().Msgf("Status: %s served by ingress %v", resp.Status, fields.rule)
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}
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p.log.Debug().Msgf("CF-RAY: %s Response Headers %+v", fields.cfRay, resp.Header)
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if contentLen := resp.ContentLength; contentLen == -1 {
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p.log.Debug().Msgf("CF-RAY: %s Response content length unknown", fields.cfRay)
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} else {
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p.log.Debug().Msgf("CF-RAY: %s Response content length %d", fields.cfRay, contentLen)
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}
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}
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func (p *proxy) logRequestError(err error, cfRay string, rule string) {
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requestErrors.Inc()
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log := p.log.Error().Err(err)
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if cfRay != "" {
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log = log.Str(LogFieldCFRay, cfRay)
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}
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if rule != "" {
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log = log.Str(LogFieldRule, rule)
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}
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log.Msg("")
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}
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func findCfRayHeader(req *http.Request) string {
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return req.Header.Get("Cf-Ray")
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}
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func isLBProbeRequest(req *http.Request) bool {
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return strings.HasPrefix(req.UserAgent(), lbProbeUserAgentPrefix)
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}
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