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3 Commits
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426bd5a659
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426bd5a659
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5ff8521bf4
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0faa8ec86a
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165
addr-map.go
165
addr-map.go
@ -1,43 +1,148 @@
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package main
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import (
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"crypto/rand"
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"encoding/binary"
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"log"
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"math"
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"net"
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"sync"
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"time"
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"github.com/cespare/xxhash/v2"
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)
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// TODO: write more convenient version
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func addrMap(srcIp net.IP, dstCidr *net.IPNet) net.IP {
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addrlen := len(srcIp)
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if addrlen != len(dstCidr.IP) {
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log.Fatalf("addrMap(): src/dst size mismatch: %v vs %v", len(srcIp), len(dstCidr.IP))
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}
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const (
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addrMapHouseKeepInterval = time.Second / 2
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)
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var addr net.IP = make([]byte, addrlen)
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var (
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addr4, addr6 sync.Map
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)
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hsum := xxhash.Sum64(srcIp)
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bsum := binary.NativeEndian.AppendUint64([]byte{}, hsum)
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blen := len(bsum)
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if addrlen > blen {
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// extend bsum
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tmp := append(make([]byte, addrlen-blen), bsum...)
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bsum = tmp
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}
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if addrlen < blen {
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// trim bsum
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bsum = bsum[:addrlen]
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}
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// apply inverted mask to bsum and sum with addr
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for i := range addrlen / 4 {
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a := binary.NativeEndian.Uint32(dstCidr.IP[i*4:])
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b := binary.NativeEndian.Uint32(bsum[i*4:])
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m := binary.NativeEndian.Uint32(dstCidr.Mask[i*4:])
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a += (b & ^m)
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binary.NativeEndian.PutUint32(addr[i*4:], a)
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}
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return addr
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type AddrMap struct {
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SrcAddr net.IP
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DstAddr net.IP
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Ttl uint32
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Created time.Time
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}
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func (a *AddrMap) GetTtl() int32 {
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x := math.Trunc(time.Since(a.Created).Round(addrMapHouseKeepInterval).Seconds())
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return int32(a.Ttl) - int32(x)
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}
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func setupAddrMapHousekeeping() {
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go func() {
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for {
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time.Sleep(addrMapHouseKeepInterval)
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addr4.Range(func(key, value any) bool {
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a, ok := value.(AddrMap)
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if ok {
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if a.GetTtl() > 1 {
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return true
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}
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}
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// delete if value is bogus or if ttl is less than second
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addr4.Delete(key)
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return true
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})
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}
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}()
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go func() {
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for {
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time.Sleep(addrMapHouseKeepInterval)
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addr6.Range(func(key, value any) bool {
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a, ok := value.(AddrMap)
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if ok {
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if a.GetTtl() > 1 {
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return true
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}
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}
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// delete if value is bogus or if ttl is less than second
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addr6.Delete(key)
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return true
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})
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}
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}()
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}
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func addrMapGet(srcIp net.IP, dstCidr *net.IPNet, ttl uint32) net.IP {
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addrlen := len(srcIp)
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switch addrlen {
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case net.IPv4len, net.IPv6len:
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default:
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log.Fatalf("addrMapGet(): src size mismatch: %v", addrlen)
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}
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if addrlen != len(dstCidr.IP) {
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log.Fatalf("addrMapGet(): src/dst size mismatch: %v vs %v", addrlen, len(dstCidr.IP))
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}
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if addrlen != len(dstCidr.Mask) {
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log.Fatalf("addrMapGet(): src/dst size mismatch: %v vs %v", addrlen, len(dstCidr.IP))
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}
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var curr AddrMap
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curr.SrcAddr = make([]byte, addrlen)
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curr.DstAddr = make([]byte, addrlen)
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copy(curr.DstAddr, srcIp)
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curr.Ttl = ttl
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for {
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_, err := rand.Read(curr.SrcAddr)
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if err != nil {
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log.Fatalf("rand.Read(): error %v", err)
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}
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// adjust random bytes to dstCidr
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for i := range addrlen / 4 {
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a := binary.NativeEndian.Uint32(dstCidr.IP[i*4:])
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b := binary.NativeEndian.Uint32(curr.SrcAddr[i*4:])
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m := binary.NativeEndian.Uint32(dstCidr.Mask[i*4:])
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a += (b & ^m)
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binary.NativeEndian.PutUint32(curr.SrcAddr[i*4:], a)
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}
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hsum := xxhash.Sum64(curr.SrcAddr)
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curr.Created = time.Now()
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var xprev any
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var loaded bool
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switch addrlen {
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case net.IPv4len:
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xprev, loaded = addr4.LoadOrStore(hsum, curr)
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case net.IPv6len:
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xprev, loaded = addr6.LoadOrStore(hsum, curr)
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}
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if !loaded {
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// early return
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return curr.SrcAddr
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}
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prev, ok := xprev.(AddrMap)
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if !ok {
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log.Fatalf("addrMapGet(): wrong value type from sync.Map")
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}
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if !net.IP.Equal(curr.SrcAddr, prev.SrcAddr) {
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// generate next random address
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continue
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}
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if !net.IP.Equal(curr.DstAddr, prev.DstAddr) {
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// generate next random address
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continue
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}
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if prev.GetTtl() < int32(curr.Ttl) {
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switch addrlen {
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case net.IPv4len:
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addr4.Store(hsum, curr)
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case net.IPv6len:
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addr6.Store(hsum, curr)
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}
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}
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break
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}
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return curr.SrcAddr
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}
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6
cfg.go
6
cfg.go
@ -14,14 +14,14 @@ const (
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cfgResolverEndpoint = "127.1.0.1:53"
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cfgResolverProto = "tcp"
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cfgResolverTimeout = 2500 * time.Millisecond
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cfgResolverTimeout = 2000 * time.Millisecond
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cfgNftTable = "uni"
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cfgNftTableFamily = nft.TableFamilyINet
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cfgNftMapV4 = "tele4"
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cfgNftMapV6 = "tele6"
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cfgNftCidrV4 = "251.0.0.0/8"
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cfgNftCidrV6 = "2001:db8:11::/48"
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cfgNftCidrV4 = "198.18.0.0/15"
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cfgNftCidrV6 = "2001:db8:11::/80"
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cfgSoaNs = "gw.vpn."
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cfgSoaMbox = "dns.gw.vpn."
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@ -140,18 +140,19 @@ func dnsRemap(qname string, qtype uint16, orig *dns.Msg) ([]PowerDnsAnswer, erro
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continue
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}
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// HACK: clip ttl
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r.Ttl = dnsClipTtl(r.Ttl)
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var srcAddr net.IP = make([]byte, r.AddrLen)
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copy(srcAddr, r.Addr)
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var dstAddr net.IP
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switch r.AddrLen {
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case net.IPv4len:
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dstAddr = addrMap(r.Addr, nftCidrV4)
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dstAddr = addrMapGet(r.Addr, nftCidrV4, r.Ttl)
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case net.IPv6len:
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dstAddr = addrMap(r.Addr, nftCidrV6)
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dstAddr = addrMapGet(r.Addr, nftCidrV6, r.Ttl)
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}
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// HACK: clip ttl
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r.Ttl = dnsClipTtl(r.Ttl)
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// HACK: replace addr
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copy(r.Addr, dstAddr)
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@ -1,7 +1,7 @@
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#!/usr/sbin/nft -f
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define n_tele4 = 251.0.0.0/8
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define n_tele6 = 2001:db8:11::/48
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define n_tele4 = 198.18.0.0/15
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define n_tele6 = 2001:db8:11::/80
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table inet uni {
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12
go.mod
12
go.mod
@ -40,13 +40,13 @@ require (
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github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
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github.com/ugorji/go/codec v1.2.12 // indirect
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golang.org/x/arch v0.8.0 // indirect
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golang.org/x/crypto v0.23.0 // indirect
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golang.org/x/mod v0.17.0 // indirect
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golang.org/x/net v0.25.0 // indirect
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golang.org/x/crypto v0.24.0 // indirect
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golang.org/x/mod v0.18.0 // indirect
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golang.org/x/net v0.26.0 // indirect
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golang.org/x/sync v0.7.0 // indirect
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golang.org/x/sys v0.20.0 // indirect
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golang.org/x/text v0.15.0 // indirect
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golang.org/x/tools v0.21.0 // indirect
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golang.org/x/sys v0.21.0 // indirect
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golang.org/x/text v0.16.0 // indirect
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golang.org/x/tools v0.22.0 // indirect
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google.golang.org/protobuf v1.34.1 // indirect
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gopkg.in/yaml.v3 v3.0.1 // indirect
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)
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24
go.sum
24
go.sum
@ -97,22 +97,22 @@ github.com/vishvananda/netns v0.0.0-20180720170159-13995c7128cc/go.mod h1:ZjcWmF
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golang.org/x/arch v0.0.0-20210923205945-b76863e36670/go.mod h1:5om86z9Hs0C8fWVUuoMHwpExlXzs5Tkyp9hOrfG7pp8=
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golang.org/x/arch v0.8.0 h1:3wRIsP3pM4yUptoR96otTUOXI367OS0+c9eeRi9doIc=
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golang.org/x/arch v0.8.0/go.mod h1:FEVrYAQjsQXMVJ1nsMoVVXPZg6p2JE2mx8psSWTDQys=
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golang.org/x/crypto v0.23.0 h1:dIJU/v2J8Mdglj/8rJ6UUOM3Zc9zLZxVZwwxMooUSAI=
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golang.org/x/crypto v0.23.0/go.mod h1:CKFgDieR+mRhux2Lsu27y0fO304Db0wZe70UKqHu0v8=
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golang.org/x/mod v0.17.0 h1:zY54UmvipHiNd+pm+m0x9KhZ9hl1/7QNMyxXbc6ICqA=
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golang.org/x/mod v0.17.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
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golang.org/x/net v0.25.0 h1:d/OCCoBEUq33pjydKrGQhw7IlUPI2Oylr+8qLx49kac=
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golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM=
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golang.org/x/crypto v0.24.0 h1:mnl8DM0o513X8fdIkmyFE/5hTYxbwYOjDS/+rK6qpRI=
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golang.org/x/crypto v0.24.0/go.mod h1:Z1PMYSOR5nyMcyAVAIQSKCDwalqy85Aqn1x3Ws4L5DM=
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golang.org/x/mod v0.18.0 h1:5+9lSbEzPSdWkH32vYPBwEpX8KwDbM52Ud9xBUvNlb0=
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golang.org/x/mod v0.18.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
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golang.org/x/net v0.26.0 h1:soB7SVo0PWrY4vPW/+ay0jKDNScG2X9wFeYlXIvJsOQ=
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golang.org/x/net v0.26.0/go.mod h1:5YKkiSynbBIh3p6iOc/vibscux0x38BZDkn8sCUPxHE=
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golang.org/x/sync v0.7.0 h1:YsImfSBoP9QPYL0xyKJPq0gcaJdG3rInoqxTWbfQu9M=
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golang.org/x/sync v0.7.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
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golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
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golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
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golang.org/x/text v0.15.0 h1:h1V/4gjBv8v9cjcR6+AR5+/cIYK5N/WAgiv4xlsEtAk=
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golang.org/x/text v0.15.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
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golang.org/x/tools v0.21.0 h1:qc0xYgIbsSDt9EyWz05J5wfa7LOVW0YTLOXrqdLAWIw=
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golang.org/x/tools v0.21.0/go.mod h1:aiJjzUbINMkxbQROHiO6hDPo2LHcIPhhQsa9DLh0yGk=
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golang.org/x/sys v0.21.0 h1:rF+pYz3DAGSQAxAu1CbC7catZg4ebC4UIeIhKxBZvws=
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golang.org/x/sys v0.21.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
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golang.org/x/text v0.16.0 h1:a94ExnEXNtEwYLGJSIUxnWoxoRz/ZcCsV63ROupILh4=
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golang.org/x/text v0.16.0/go.mod h1:GhwF1Be+LQoKShO3cGOHzqOgRrGaYc9AvblQOmPVHnI=
|
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golang.org/x/tools v0.22.0 h1:gqSGLZqv+AI9lIQzniJ0nZDRG5GBPsSi+DRNHWNz6yA=
|
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golang.org/x/tools v0.22.0/go.mod h1:aCwcsjqvq7Yqt6TNyX7QMU2enbQ/Gt0bo6krSeEri+c=
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google.golang.org/protobuf v1.34.1 h1:9ddQBjfCyZPOHPUiPxpYESBLc+T8P3E+Vo4IbKZgFWg=
|
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google.golang.org/protobuf v1.34.1/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
|
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gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
|
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Block a user