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119 lines
2.4 KiB
119 lines
2.4 KiB
package router
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import (
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"net/netip"
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"strconv"
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"github.com/xtls/xray-core/common/net"
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"go4.org/netipx"
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)
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type GeoIPMatcher struct {
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countryCode string
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reverseMatch bool
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ip4 *netipx.IPSet
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ip6 *netipx.IPSet
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}
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func (m *GeoIPMatcher) Init(cidrs []*CIDR) error {
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var builder4, builder6 netipx.IPSetBuilder
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for _, cidr := range cidrs {
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ip := net.IP(cidr.GetIp())
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ipPrefixString := ip.String() + "/" + strconv.Itoa(int(cidr.GetPrefix()))
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ipPrefix, err := netip.ParsePrefix(ipPrefixString)
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if err != nil {
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return err
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}
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switch len(ip) {
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case net.IPv4len:
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builder4.AddPrefix(ipPrefix)
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case net.IPv6len:
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builder6.AddPrefix(ipPrefix)
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}
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}
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if ip4, err := builder4.IPSet(); err != nil {
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return err
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} else {
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m.ip4 = ip4
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}
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if ip6, err := builder6.IPSet(); err != nil {
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return err
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} else {
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m.ip6 = ip6
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}
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return nil
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}
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func (m *GeoIPMatcher) SetReverseMatch(isReverseMatch bool) {
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m.reverseMatch = isReverseMatch
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}
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func (m *GeoIPMatcher) match4(ip net.IP) bool {
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nip, ok := netipx.FromStdIP(ip)
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if !ok {
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return false
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}
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return m.ip4.Contains(nip)
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}
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func (m *GeoIPMatcher) match6(ip net.IP) bool {
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nip, ok := netipx.FromStdIP(ip)
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if !ok {
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return false
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}
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return m.ip6.Contains(nip)
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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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isMatched := false
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switch len(ip) {
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case net.IPv4len:
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isMatched = m.match4(ip)
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case net.IPv6len:
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isMatched = m.match6(ip)
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}
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if m.reverseMatch {
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return !isMatched
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}
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return isMatched
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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 && m.reverseMatch == geoip.ReverseMatch {
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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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reverseMatch: geoip.ReverseMatch,
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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 globalGeoIPContainer GeoIPMatcherContainer
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