forked from scionproto/scion
/
main.go
103 lines (94 loc) · 2.53 KB
/
main.go
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// Copyright 2016 ETH Zurich
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// This file takes care of parsing command-line flags, setting up logging and
// signal handling, setting resource limits, and starting a new Router
// instance.
package main
import (
"flag"
_ "net/http/pprof"
"os"
"os/signal"
"os/user"
"syscall"
log "github.com/inconshreveable/log15"
"github.com/scionproto/scion/go/lib/assert"
"github.com/scionproto/scion/go/lib/common"
liblog "github.com/scionproto/scion/go/lib/log"
"github.com/scionproto/scion/go/lib/profile"
)
var (
id = flag.String("id", "", "Element ID (Required. E.g. 'br4-21-9')")
confDir = flag.String("confd", ".", "Configuration directory")
profFlag = flag.Bool("profile", false, "Enable cpu and memory profiling")
)
func main() {
// Parse and check flags.
flag.Parse()
if *id == "" {
log.Crit("No element ID specified")
os.Exit(1)
}
liblog.Setup(*id)
defer liblog.LogPanicAndExit()
if err := checkPerms(); err != nil {
log.Crit("Permissions checks failed", "err", err)
liblog.Flush()
os.Exit(1)
}
if *profFlag {
// Start profiling if requested.
profile.Start(*id)
}
setupSignals()
r, err := NewRouter(*id, *confDir)
if err != nil {
log.Crit("Startup failed", "err", err)
liblog.Flush()
os.Exit(1)
}
if assert.On {
log.Info("Router was built with assertions ON.")
} else {
log.Info("Router was built with assertions OFF.")
}
log.Info("Starting up", "id", *id, "pid", os.Getpid())
if err := r.Run(); err != nil {
log.Crit("Run failed", "err", err)
liblog.Flush()
os.Exit(1)
}
}
func setupSignals() {
sig := make(chan os.Signal, 2)
signal.Notify(sig, os.Interrupt)
signal.Notify(sig, syscall.SIGTERM)
go func() {
<-sig
log.Info("Exiting")
profile.Stop()
liblog.Flush()
os.Exit(1)
}()
}
func checkPerms() error {
user, err := user.Current()
if err != nil {
return common.NewBasicError("Error retrieving user", err)
}
if user.Uid == "0" {
return common.NewBasicError("Running as root is not allowed for security reasons", nil)
}
return nil
}