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ipn/ipnlocal: add owner-only debug handler to get process env

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For debugging Synology. Like the existing goroutines handler, in that
it's owner-only.

Change-Id: I852f0626be8e1c0b6794c1e062111d14adc3e6ac
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2021-11-03 11:17:56 -07:00 committed by Brad Fitzpatrick
parent 6d82a18916
commit c7bff35fee
1 changed files with 26 additions and 0 deletions
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26
ipn/ipnlocal/peerapi.go
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@ -6,6 +6,7 @@ package ipnlocal
import ( import (
"context" "context"
"encoding/json"
"errors" "errors"
"fmt" "fmt"
"hash/crc32" "hash/crc32"
@ -29,6 +30,7 @@ import (
"inet.af/netaddr" "inet.af/netaddr"
"tailscale.com/client/tailscale/apitype" "tailscale.com/client/tailscale/apitype"
"tailscale.com/hostinfo"
"tailscale.com/ipn" "tailscale.com/ipn"
"tailscale.com/logtail/backoff" "tailscale.com/logtail/backoff"
"tailscale.com/net/interfaces" "tailscale.com/net/interfaces"
@ -504,6 +506,10 @@ func (h *peerAPIHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
h.handleServeGoroutines(w, r) h.handleServeGoroutines(w, r)
return return
} }
if r.URL.Path == "/v0/env" {
h.handleServeEnv(w, r)
return
}
who := h.peerUser.DisplayName who := h.peerUser.DisplayName
fmt.Fprintf(w, `<html> fmt.Fprintf(w, `<html>
<meta name="viewport" content="width=device-width, initial-scale=1"> <meta name="viewport" content="width=device-width, initial-scale=1">
@ -710,3 +716,23 @@ func (h *peerAPIHandler) handleServeGoroutines(w http.ResponseWriter, r *http.Re
} }
w.Write(buf) w.Write(buf)
} }
func (h *peerAPIHandler) handleServeEnv(w http.ResponseWriter, r *http.Request) {
if !h.isSelf {
http.Error(w, "not owner", http.StatusForbidden)
return
}
var data struct {
Hostinfo *tailcfg.Hostinfo
Uid int
Args []string
Env []string
}
data.Hostinfo = hostinfo.New()
data.Uid = os.Getuid()
data.Args = os.Args
data.Env = os.Environ()
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(data)
}