mirror of https://github.com/v2fly/v2ray-core.git
123 lines
3.3 KiB
Go
123 lines
3.3 KiB
Go
package dns
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import (
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"v2ray.com/core/common"
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"v2ray.com/core/common/net"
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"v2ray.com/core/common/strmatcher"
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"v2ray.com/core/features"
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)
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// StaticHosts represents static domain-ip mapping in DNS server.
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type StaticHosts struct {
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ips [][]net.Address
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matchers *strmatcher.MatcherGroup
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}
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var typeMap = map[DomainMatchingType]strmatcher.Type{
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DomainMatchingType_Full: strmatcher.Full,
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DomainMatchingType_Subdomain: strmatcher.Domain,
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DomainMatchingType_Keyword: strmatcher.Substr,
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DomainMatchingType_Regex: strmatcher.Regex,
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}
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func toStrMatcher(t DomainMatchingType, domain string) (strmatcher.Matcher, error) {
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strMType, f := typeMap[t]
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if !f {
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return nil, newError("unknown mapping type", t).AtWarning()
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}
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matcher, err := strMType.New(domain)
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if err != nil {
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return nil, newError("failed to create str matcher").Base(err)
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}
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return matcher, nil
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}
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// NewStaticHosts creates a new StaticHosts instance.
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func NewStaticHosts(hosts []*Config_HostMapping, legacy map[string]*net.IPOrDomain) (*StaticHosts, error) {
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g := new(strmatcher.MatcherGroup)
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sh := &StaticHosts{
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ips: make([][]net.Address, len(hosts)+len(legacy)+16),
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matchers: g,
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}
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if legacy != nil {
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features.PrintDeprecatedFeatureWarning("simple host mapping")
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for domain, ip := range legacy {
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matcher, err := strmatcher.Full.New(domain)
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common.Must(err)
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id := g.Add(matcher)
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address := ip.AsAddress()
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if address.Family().IsDomain() {
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return nil, newError("invalid domain address in static hosts: ", address.Domain()).AtWarning()
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}
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sh.ips[id] = []net.Address{address}
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}
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}
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for _, mapping := range hosts {
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matcher, err := toStrMatcher(mapping.Type, mapping.Domain)
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if err != nil {
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return nil, newError("failed to create domain matcher").Base(err)
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}
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id := g.Add(matcher)
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ips := make([]net.Address, 0, len(mapping.Ip)+1)
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switch {
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case len(mapping.Ip) > 0:
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for _, ip := range mapping.Ip {
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addr := net.IPAddress(ip)
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if addr == nil {
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return nil, newError("invalid IP address in static hosts: ", ip).AtWarning()
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}
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ips = append(ips, addr)
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}
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case len(mapping.ProxiedDomain) > 0:
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ips = append(ips, net.DomainAddress(mapping.ProxiedDomain))
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default:
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return nil, newError("neither IP address nor proxied domain specified for domain: ", mapping.Domain).AtWarning()
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}
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// Special handling for localhost IPv6. This is a dirty workaround as JSON config supports only single IP mapping.
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if len(ips) == 1 && ips[0] == net.LocalHostIP {
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ips = append(ips, net.LocalHostIPv6)
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}
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sh.ips[id] = ips
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}
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return sh, nil
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}
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func filterIP(ips []net.Address, option IPOption) []net.Address {
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filtered := make([]net.Address, 0, len(ips))
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for _, ip := range ips {
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if (ip.Family().IsIPv4() && option.IPv4Enable) || (ip.Family().IsIPv6() && option.IPv6Enable) {
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filtered = append(filtered, ip)
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}
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}
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if len(filtered) == 0 {
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return nil
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}
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return filtered
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}
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// LookupIP returns IP address for the given domain, if exists in this StaticHosts.
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func (h *StaticHosts) LookupIP(domain string, option IPOption) []net.Address {
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indices := h.matchers.Match(domain)
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if len(indices) == 0 {
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return nil
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}
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ips := []net.Address{}
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for _, id := range indices {
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ips = append(ips, h.ips[id]...)
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}
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if len(ips) == 1 && ips[0].Family().IsDomain() {
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return ips
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}
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return filterIP(ips, option)
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}
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