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104 lines
1.8 KiB
104 lines
1.8 KiB
package main
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import (
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// _ "net/http/pprof"
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"os"
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"os/signal"
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"time"
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"github.com/op/go-logging"
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"github.com/subgraph/fw-daemon/nfqueue"
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"sync"
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"syscall"
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"unsafe"
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)
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var log = logging.MustGetLogger("sgfw")
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var logFormat = logging.MustStringFormatter(
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"%{level:.4s} %{id:03x} %{message}",
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)
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var ttyFormat = logging.MustStringFormatter(
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"%{color}%{time:15:04:05} ▶ %{level:.4s} %{id:03x}%{color:reset} %{message}",
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)
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const ioctlReadTermios = 0x5401
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func isTerminal(fd int) bool {
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var termios syscall.Termios
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_, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlReadTermios, uintptr(unsafe.Pointer(&termios)), 0, 0, 0)
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return err == 0
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}
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func init() {
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format := logFormat
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if(isTerminal(int(os.Stderr.Fd()))) {
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format = ttyFormat
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}
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backend := logging.NewLogBackend(os.Stderr, "", 0)
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formatter := logging.NewBackendFormatter(backend, format)
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leveler := logging.AddModuleLevel(formatter)
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log.SetBackend(leveler)
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}
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type Firewall struct {
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dbus *dbusServer
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dns *dnsCache
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lock sync.Mutex
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policyMap map[string]*Policy
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policies []*Policy
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}
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func (fw *Firewall) runFilter() {
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q := nfqueue.NewNFQueue(0)
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defer q.Destroy()
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q.DefaultVerdict = nfqueue.DROP
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q.Timeout = 5 * time.Minute
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packets := q.Process()
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sigs := make(chan os.Signal, 1)
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signal.Notify(sigs, os.Interrupt, os.Kill)
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for {
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select {
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case pkt := <-packets:
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fw.filterPacket(pkt)
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case <-sigs:
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return
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}
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}
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}
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func main() {
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if os.Geteuid() != 0 {
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log.Error("Must be run as root")
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os.Exit(1)
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}
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setupIPTables()
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ds, err := newDbusServer()
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if err != nil {
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log.Error(err.Error())
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os.Exit(1)
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}
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fw := &Firewall{
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dbus: ds,
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dns: NewDnsCache(),
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policyMap: make(map[string]*Policy),
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}
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fw.loadRules()
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/*
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go func() {
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http.ListenAndServe("localhost:6060", nil)
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}()
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*/
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fw.runFilter()
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}
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