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net/dns/resolver: add debug HTML handler to see what DNS traffic was forwarded

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Change-Id: I6b790e92dcc608515ac8b178f2271adc9fd98f78
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-12-21 13:52:50 -08:00
committed by Brad Fitzpatrick
parent ae319b4636
commit 0aa4c6f147
4 changed files with 114 additions and 0 deletions
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17
ipn/ipnlocal/peerapi.go
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@@ -32,6 +32,7 @@ import (
"golang.org/x/net/dns/dnsmessage"
"inet.af/netaddr"
"tailscale.com/client/tailscale/apitype"
"tailscale.com/health"
"tailscale.com/hostinfo"
"tailscale.com/ipn"
"tailscale.com/logtail/backoff"
@@ -556,6 +557,9 @@ func (h *peerAPIHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
case "/v0/magicsock":
h.handleServeMagicsock(w, r)
return
case "/v0/dnsfwd":
h.handleServeDNSFwd(w, r)
return
}
who := h.peerUser.DisplayName
fmt.Fprintf(w, `<html>
@@ -808,6 +812,19 @@ func (h *peerAPIHandler) handleServeMetrics(w http.ResponseWriter, r *http.Reque
clientmetric.WritePrometheusExpositionFormat(w)
}
func (h *peerAPIHandler) handleServeDNSFwd(w http.ResponseWriter, r *http.Request) {
if !h.isSelf {
http.Error(w, "not owner", http.StatusForbidden)
return
}
dh := health.DebugHandler("dnsfwd")
if dh == nil {
http.Error(w, "not wired up", 500)
return
}
dh.ServeHTTP(w, r)
}
func (h *peerAPIHandler) replyToDNSQueries() bool {
if h.isSelf {
// If the peer is owned by the same user, just allow it