/
metro.go
248 lines (214 loc) · 6.02 KB
/
metro.go
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// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file in the root of the source
// tree.
package main
import (
"bytes"
"flag"
"fmt"
"io/ioutil"
"os"
"os/signal"
"path/filepath"
"strings"
"syscall"
"time"
log "github.com/cihub/seelog"
"github.com/google/gopacket/pcap"
)
const (
defaultConfigFile = "/etc/dd-agent/checks.d/go-metro.yaml"
defaultLogFile = "/var/log/datadog/go-metro.log"
defaultBPFFilter = "tcp"
baseFileLogConfig = `<seelog minlevel="ddloglevel">
<outputs formatid="common">
<rollingfile type="size" filename="ddlogfile" maxsize="100000" maxrolls="5" />
</outputs>
<formats>
<format id="common" format="%Date %Time TIMEZONE | %LEVEL | (%File:%Line) | %Msg%n" />
</formats>
</seelog>`
baseStdoLogConfig = `<seelog minlevel="ddloglevel">
<outputs formatid="common">
<console />
</outputs>
<formats>
<format id="common" format="%Date %Time TIMEZONE | %LEVEL | (%File:%Line) | %Msg%n"/>
</formats>
</seelog>`
)
var cfg = flag.String("cfg", defaultConfigFile, "YAML configuration file.")
var logfile = flag.String("log", defaultLogFile, "Destination log file.")
var filter = flag.String("f", defaultBPFFilter, "BPF filter for pcap")
var soften = flag.Bool("st", true, "Soften RTTM")
type arrayFlags []string
func (i *arrayFlags) String() string {
return "my string representation"
}
func (i *arrayFlags) Set(value string) error {
*i = append(*i, value)
return nil
}
type Exit struct{ Code int }
// exit code handler
func handleExit() {
if e := recover(); e != nil {
if exit, ok := e.(Exit); ok == true {
os.Exit(exit.Code)
}
panic(e) // not an Exit, bubble up
}
}
func initLogging(to_file bool, level string) log.LoggerInterface {
loglevel := "warn"
switch {
case strings.EqualFold(level, "trace"):
loglevel = "trace"
case strings.EqualFold(level, "debug"):
loglevel = "debug"
case strings.EqualFold(level, "info"):
loglevel = "info"
case strings.EqualFold(level, "error"):
case strings.EqualFold(level, "err"):
loglevel = "error"
case strings.EqualFold(level, "critical"):
case strings.EqualFold(level, "crit"):
loglevel = "critical"
case strings.EqualFold(level, "warning"):
case strings.EqualFold(level, "warn"):
default:
log.Infof("Configured log level \"%s\" unknown - defaulting to WARNING level.", level)
}
var logConfig []byte
timezone, _ := time.Now().Zone()
if to_file {
logConfig = bytes.Replace([]byte(baseFileLogConfig), []byte("ddloglevel"), []byte(strings.ToLower(loglevel)), 1)
logConfig = bytes.Replace([]byte(logConfig), []byte("ddlogfile"), []byte(*logfile), 1)
} else {
logConfig = bytes.Replace([]byte(baseStdoLogConfig), []byte("ddloglevel"), []byte(strings.ToLower(loglevel)), 1)
}
logConfig = bytes.Replace([]byte(logConfig), []byte("TIMEZONE"), []byte(strings.ToUpper(timezone)), 1)
logger, err := log.LoggerFromConfigAsBytes(logConfig)
if err != nil {
log.Criticalf("Unable to initiate logger: %s", err)
panic(Exit{1})
}
log.ReplaceLogger(logger)
return logger
}
func main() {
defer handleExit()
defer log.Flush()
flag.Parse()
logger := initLogging(true, "warning")
//Parse config
filename, _ := filepath.Abs(*cfg)
yamlFile, err := ioutil.ReadFile(filename)
if err != nil {
//hack so that supervisord doesnt consider it "too quick" an exit.
time.Sleep(time.Second * 5)
panic(Exit{0})
}
var cfg MetroConfig
err = cfg.Parse(yamlFile)
if err != nil {
log.Criticalf("Error parsing configuration file: %s ", err)
panic(Exit{1})
}
//set logging
if cfg.InitConf.LogToFile {
logger = initLogging(true, cfg.InitConf.LogLevel)
} else {
logger = initLogging(false, cfg.InitConf.LogLevel)
}
defer logger.Close()
//Install signal handler
signalChan := make(chan os.Signal, 1)
signal.Notify(signalChan,
syscall.SIGHUP,
syscall.SIGINT,
syscall.SIGTERM,
syscall.SIGQUIT)
exitChan := make(chan bool)
go func() {
for {
s := <-signalChan
switch s {
// kill -SIGHUP XXXX
case syscall.SIGHUP:
log.Warn("hungup")
exitChan <- true
// kill -SIGINT XXXX or Ctrl+c
case syscall.SIGINT:
log.Warn("sig int caught, shutting down.")
exitChan <- true
// kill -SIGTERM XXXX
case syscall.SIGTERM:
log.Warn("force stop")
exitChan <- true
// kill -SIGQUIT XXXX
case syscall.SIGQUIT:
log.Warn("stop and core dump")
exitChan <- true
default:
fmt.Println("Unknown signal.")
}
}
}()
ifaces, err := pcap.FindAllDevs()
if err != nil {
log.Criticalf("Error getting interface details: %s", err)
panic(Exit{1})
}
sniffers := make([]*MetroSniffer, 0)
for i := range cfg.Configs {
if len(cfg.Configs[i].Ips) == 0 && len(cfg.Configs[i].Hosts) == 0 {
log.Errorf("Whitelists must be enabled for go-metro to run (you may whitelist by IP or hostname in config file).")
panic(Exit{1})
}
for j := range ifaces {
if ifaces[j].Name == cfg.Configs[i].Interface {
log.Infof("Will attempt sniffing off interface %q", cfg.Configs[i].Interface)
metrosniffer, err := NewMetroSniffer(cfg.InitConf, cfg.Configs[i], *filter)
if err == nil {
sniffers = append(sniffers, metrosniffer)
metrosniffer.Start()
} else {
log.Errorf("Unable to instantiate sniffer for interface %q", cfg.Configs[i].Interface)
}
}
}
}
if len(sniffers) == 0 {
log.Criticalf("No sniffers available, baling out (please check your configuration and privileges).")
panic(Exit{1})
}
//Check all sniffers are up and running or quit.
log.Debug("Waiting for sniffers to start...")
time.Sleep(time.Second)
for i := range sniffers {
running := sniffers[i].Running()
if !running {
log.Criticalf("Unable to start sniffer for interface: %q (please check your configuration and privileges).", sniffers[i].Iface)
os.Exit(1)
}
}
quit := false
for !quit {
msg := <-exitChan
switch msg {
case true:
quit = true
case false:
default:
quit = false
}
}
//Stop the show
for i := range sniffers {
err := sniffers[i].Stop()
if err != nil {
log.Infof("Error shutting down %s sniffer: %v.", sniffers[i].Iface, err)
}
}
}