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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
// Package c2n registers support for C2N (Control-to-Node) communications.
package c2n
import (
"bufio"
"bytes"
"context"
"net/http"
"time"
"tailscale.com/control/controlclient"
"tailscale.com/tailcfg"
"tailscale.com/tempfork/httprec"
"tailscale.com/types/logger"
)
func init() {
controlclient.HookAnswerC2NPing.Set(answerC2NPing)
}
func answerC2NPing(logf logger.Logf, c2nHandler http.Handler, c *http.Client, pr *tailcfg.PingRequest) {
if c2nHandler == nil {
logf("answerC2NPing: c2nHandler not defined")
return
}
hreq, err := http.ReadRequest(bufio.NewReader(bytes.NewReader(pr.Payload)))
if err != nil {
logf("answerC2NPing: ReadRequest: %v", err)
return
}
if pr.Log {
logf("answerC2NPing: got c2n request for %v ...", hreq.RequestURI)
}
handlerTimeout := time.Minute
if v := hreq.Header.Get("C2n-Handler-Timeout"); v != "" {
handlerTimeout, _ = time.ParseDuration(v)
}
handlerCtx, cancel := context.WithTimeout(context.Background(), handlerTimeout)
defer cancel()
hreq = hreq.WithContext(handlerCtx)
rec := httprec.NewRecorder()
c2nHandler.ServeHTTP(rec, hreq)
cancel()
c2nResBuf := new(bytes.Buffer)
rec.Result().Write(c2nResBuf)
replyCtx, cancel := context.WithTimeout(context.Background(), time.Minute)
defer cancel()
req, err := http.NewRequestWithContext(replyCtx, "POST", pr.URL, c2nResBuf)
if err != nil {
logf("answerC2NPing: NewRequestWithContext: %v", err)
return
}
if pr.Log {
logf("answerC2NPing: sending POST ping to %v ...", pr.URL)
}
t0 := time.Now()
_, err = c.Do(req)
d := time.Since(t0).Round(time.Millisecond)
if err != nil {
logf("answerC2NPing error: %v to %v (after %v)", err, pr.URL, d)
} else if pr.Log {
logf("answerC2NPing complete to %v (after %v)", pr.URL, d)
}
}
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