package main import ( // _ "net/http/pprof" "os" "os/signal" "time" "github.com/subgraph/fw-daemon/Godeps/_workspace/src/github.com/op/go-logging" "github.com/subgraph/fw-daemon/nfqueue" "github.com/subgraph/fw-daemon/proc" "sync" "syscall" "unsafe" ) var log = logging.MustGetLogger("sgfw") var logFormat = logging.MustStringFormatter( "%{level:.4s} %{id:03x} %{message}", ) var ttyFormat = logging.MustStringFormatter( "%{color}%{time:15:04:05} ▶ %{level:.4s} %{id:03x}%{color:reset} %{message}", ) const ioctlReadTermios = 0x5401 func isTerminal(fd int) bool { var termios syscall.Termios _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlReadTermios, uintptr(unsafe.Pointer(&termios)), 0, 0, 0) return err == 0 } func setupLoggerBackend() logging.LeveledBackend { format := logFormat if isTerminal(int(os.Stderr.Fd())) { format = ttyFormat } backend := logging.NewLogBackend(os.Stderr, "", 0) formatter := logging.NewBackendFormatter(backend, format) leveler := logging.AddModuleLevel(formatter) leveler.SetLevel(logging.NOTICE, "sgfw") return leveler } var logRedact bool type Firewall struct { dbus *dbusServer dns *dnsCache enabled bool logBackend logging.LeveledBackend lock sync.Mutex policyMap map[string]*Policy policies []*Policy ruleLock sync.Mutex rulesById map[uint]*Rule nextRuleId uint } func (fw *Firewall) setEnabled(flag bool) { fw.lock.Lock() defer fw.lock.Unlock() fw.enabled = flag } func (fw *Firewall) isEnabled() bool { fw.lock.Lock() defer fw.lock.Unlock() return fw.enabled } func (fw *Firewall) clearRules() { fw.ruleLock.Lock() defer fw.ruleLock.Unlock() fw.rulesById = nil fw.nextRuleId = 0 } func (fw *Firewall) addRule(r *Rule) { fw.ruleLock.Lock() defer fw.ruleLock.Unlock() r.id = fw.nextRuleId fw.nextRuleId += 1 if fw.rulesById == nil { fw.rulesById = make(map[uint]*Rule) } fw.rulesById[r.id] = r } func (fw *Firewall) getRuleById(id uint) *Rule { fw.ruleLock.Lock() defer fw.ruleLock.Unlock() if fw.rulesById == nil { return nil } return fw.rulesById[id] } func (fw *Firewall) runFilter() { q := nfqueue.NewNFQueue(0) defer q.Destroy() q.DefaultVerdict = nfqueue.DROP q.Timeout = 5 * time.Minute packets := q.Process() sigKillChan := make(chan os.Signal, 1) signal.Notify(sigKillChan, os.Interrupt, os.Kill) sigHupChan := make(chan os.Signal, 1) signal.Notify(sigHupChan, syscall.SIGHUP) for { select { case pkt := <-packets: if fw.isEnabled() { fw.filterPacket(pkt) } else { pkt.Accept() } case <-sigHupChan: fw.loadRules() case <-sigKillChan: return } } } func main() { logBackend := setupLoggerBackend() log.SetBackend(logBackend) proc.SetLogger(log) if os.Geteuid() != 0 { log.Error("Must be run as root") os.Exit(1) } setupIPTables() ds, err := newDbusServer() if err != nil { log.Error(err.Error()) os.Exit(1) } fw := &Firewall{ dbus: ds, dns: NewDnsCache(), enabled: true, logBackend: logBackend, policyMap: make(map[string]*Policy), } ds.fw = fw fw.loadRules() /* go func() { http.ListenAndServe("localhost:6060", nil) }() */ socksConfig := SocksChainConfig{ TargetSocksNet: "tcp", TargetSocksAddr: "127.0.0.1:9050", ListenSocksNet: "tcp", ListenSocksAddr: "127.0.0.1:8850", } wg := sync.WaitGroup{} InitSocksListener(&socksConfig, &wg) fw.runFilter() }