mirror of
https://github.com/XTLS/Xray-core.git
synced 2024-08-21 04:06:27 +00:00
192 lines
3.5 KiB
Go
192 lines
3.5 KiB
Go
package router
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import (
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"encoding/binary"
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"sort"
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"github.com/xtls/xray-core/common/net"
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)
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type ipv6 struct {
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a uint64
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b uint64
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}
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type GeoIPMatcher struct {
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countryCode string
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ip4 []uint32
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prefix4 []uint8
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ip6 []ipv6
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prefix6 []uint8
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}
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func normalize4(ip uint32, prefix uint8) uint32 {
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return (ip >> (32 - prefix)) << (32 - prefix)
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}
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func normalize6(ip ipv6, prefix uint8) ipv6 {
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if prefix <= 64 {
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ip.a = (ip.a >> (64 - prefix)) << (64 - prefix)
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ip.b = 0
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} else {
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ip.b = (ip.b >> (128 - prefix)) << (128 - prefix)
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}
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return ip
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}
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func (m *GeoIPMatcher) Init(cidrs []*CIDR) error {
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ip4Count := 0
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ip6Count := 0
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for _, cidr := range cidrs {
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ip := cidr.Ip
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switch len(ip) {
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case 4:
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ip4Count++
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case 16:
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ip6Count++
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default:
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return newError("unexpect ip length: ", len(ip))
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}
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}
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cidrList := CIDRList(cidrs)
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sort.Sort(&cidrList)
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m.ip4 = make([]uint32, 0, ip4Count)
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m.prefix4 = make([]uint8, 0, ip4Count)
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m.ip6 = make([]ipv6, 0, ip6Count)
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m.prefix6 = make([]uint8, 0, ip6Count)
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for _, cidr := range cidrs {
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ip := cidr.Ip
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prefix := uint8(cidr.Prefix)
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switch len(ip) {
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case 4:
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m.ip4 = append(m.ip4, normalize4(binary.BigEndian.Uint32(ip), prefix))
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m.prefix4 = append(m.prefix4, prefix)
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case 16:
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ip6 := ipv6{
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a: binary.BigEndian.Uint64(ip[0:8]),
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b: binary.BigEndian.Uint64(ip[8:16]),
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}
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ip6 = normalize6(ip6, prefix)
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m.ip6 = append(m.ip6, ip6)
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m.prefix6 = append(m.prefix6, prefix)
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}
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}
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return nil
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}
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func (m *GeoIPMatcher) match4(ip uint32) bool {
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if len(m.ip4) == 0 {
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return false
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}
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if ip < m.ip4[0] {
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return false
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}
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size := uint32(len(m.ip4))
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l := uint32(0)
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r := size
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for l < r {
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x := ((l + r) >> 1)
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if ip < m.ip4[x] {
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r = x
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continue
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}
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nip := normalize4(ip, m.prefix4[x])
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if nip == m.ip4[x] {
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return true
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}
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l = x + 1
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}
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return l > 0 && normalize4(ip, m.prefix4[l-1]) == m.ip4[l-1]
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}
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func less6(a ipv6, b ipv6) bool {
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return a.a < b.a || (a.a == b.a && a.b < b.b)
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}
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func (m *GeoIPMatcher) match6(ip ipv6) bool {
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if len(m.ip6) == 0 {
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return false
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}
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if less6(ip, m.ip6[0]) {
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return false
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}
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size := uint32(len(m.ip6))
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l := uint32(0)
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r := size
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for l < r {
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x := (l + r) / 2
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if less6(ip, m.ip6[x]) {
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r = x
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continue
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}
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if normalize6(ip, m.prefix6[x]) == m.ip6[x] {
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return true
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}
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l = x + 1
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}
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return l > 0 && normalize6(ip, m.prefix6[l-1]) == m.ip6[l-1]
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}
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// Match returns true if the given ip is included by the GeoIP.
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func (m *GeoIPMatcher) Match(ip net.IP) bool {
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switch len(ip) {
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case 4:
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return m.match4(binary.BigEndian.Uint32(ip))
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case 16:
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return m.match6(ipv6{
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a: binary.BigEndian.Uint64(ip[0:8]),
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b: binary.BigEndian.Uint64(ip[8:16]),
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})
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default:
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return false
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}
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}
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// GeoIPMatcherContainer is a container for GeoIPMatchers. It keeps unique copies of GeoIPMatcher by country code.
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type GeoIPMatcherContainer struct {
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matchers []*GeoIPMatcher
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}
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// Add adds a new GeoIP set into the container.
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// If the country code of GeoIP is not empty, GeoIPMatcherContainer will try to find an existing one, instead of adding a new one.
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func (c *GeoIPMatcherContainer) Add(geoip *GeoIP) (*GeoIPMatcher, error) {
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if len(geoip.CountryCode) > 0 {
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for _, m := range c.matchers {
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if m.countryCode == geoip.CountryCode {
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return m, nil
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}
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}
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}
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m := &GeoIPMatcher{
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countryCode: geoip.CountryCode,
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}
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if err := m.Init(geoip.Cidr); err != nil {
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return nil, err
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}
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if len(geoip.CountryCode) > 0 {
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c.matchers = append(c.matchers, m)
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}
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return m, nil
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}
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var (
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globalGeoIPContainer GeoIPMatcherContainer
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)
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