syncthing/cmd/stcrashreceiver/main.go

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// Copyright (C) 2019 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
// Command stcrashreceiver is a trivial HTTP server that allows two things:
//
// - uploading files (crash reports) named like a SHA256 hash using a PUT request
// - checking whether such file exists using a HEAD request
//
// Typically this should be deployed behind something that manages HTTPS.
package main
import (
"encoding/json"
"flag"
"fmt"
"io"
"io/ioutil"
"log"
"net"
"net/http"
"os"
"time"
"github.com/syncthing/syncthing/lib/sha256"
"github.com/syncthing/syncthing/lib/ur"
raven "github.com/getsentry/raven-go"
)
const maxRequestSize = 1 << 20 // 1 MiB
func main() {
dir := flag.String("dir", ".", "Directory to store reports in")
dsn := flag.String("dsn", "", "Sentry DSN")
listen := flag.String("listen", ":22039", "HTTP listen address")
flag.Parse()
mux := http.NewServeMux()
cr := &crashReceiver{
dir: *dir,
dsn: *dsn,
}
mux.Handle("/", cr)
if *dsn != "" {
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mux.HandleFunc("/newcrash/failure", handleFailureFn(*dsn))
}
log.SetOutput(os.Stdout)
if err := http.ListenAndServe(*listen, mux); err != nil {
log.Fatalln("HTTP serve:", err)
}
}
func handleFailureFn(dsn string) func(w http.ResponseWriter, req *http.Request) {
return func(w http.ResponseWriter, req *http.Request) {
lr := io.LimitReader(req.Body, maxRequestSize)
bs, err := ioutil.ReadAll(lr)
req.Body.Close()
if err != nil {
http.Error(w, err.Error(), 500)
return
}
var reports []ur.FailureReport
err = json.Unmarshal(bs, &reports)
if err != nil {
http.Error(w, err.Error(), 400)
return
}
if len(reports) == 0 {
// Shouldn't happen
log.Printf("Got zero failure reports")
return
}
version, err := parseVersion(reports[0].Version)
if err != nil {
http.Error(w, err.Error(), 400)
return
}
for _, r := range reports {
pkt := packet(version, "failure")
pkt.Message = r.Description
pkt.Extra = raven.Extra{
"count": r.Count,
}
message := sanitizeMessageLDB(r.Description)
pkt.Fingerprint = []string{message}
if err := sendReport(dsn, pkt, userIDFor(req)); err != nil {
log.Println("Failed to send failure report:", err)
} else {
log.Println("Sent failure report:", r.Description)
}
}
}
}
// userIDFor returns a string we can use as the user ID for the purpose of
// counting affected users. It's the truncated hash of a salt, the user
// remote IP, and the current month.
func userIDFor(req *http.Request) string {
addr := req.RemoteAddr
if fwd := req.Header.Get("x-forwarded-for"); fwd != "" {
addr = fwd
}
if host, _, err := net.SplitHostPort(addr); err == nil {
addr = host
}
now := time.Now().Format("200601")
salt := "stcrashreporter"
hash := sha256.Sum256([]byte(salt + addr + now))
return fmt.Sprintf("%x", hash[:8])
}