cloudflared-mirror/origin/proxy.go

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