mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-12-26 20:16:55 -05:00
110 lines
3.2 KiB
Go
110 lines
3.2 KiB
Go
package dns
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import (
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"github.com/v2fly/v2ray-core/v4/common"
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"github.com/v2fly/v2ray-core/v4/common/net"
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"github.com/v2fly/v2ray-core/v4/common/strmatcher"
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"github.com/v2fly/v2ray-core/v4/features"
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"github.com/v2fly/v2ray-core/v4/features/dns"
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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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// 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.ProxiedDomain) > 0:
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ips = append(ips, net.DomainAddress(mapping.ProxiedDomain))
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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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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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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 dns.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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return filtered
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}
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func (h *StaticHosts) lookupInternal(domain string) []net.Address {
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var ips []net.Address
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for _, id := range h.matchers.Match(domain) {
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ips = append(ips, h.ips[id]...)
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}
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return ips
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}
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func (h *StaticHosts) lookup(domain string, option dns.IPOption, maxDepth int) []net.Address {
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switch addrs := h.lookupInternal(domain); {
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case len(addrs) == 0: // Not recorded in static hosts, return nil
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return nil
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case len(addrs) == 1 && addrs[0].Family().IsDomain(): // Try to unwrap domain
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newError("found replaced domain: ", domain, " -> ", addrs[0].Domain(), ". Try to unwrap it").AtDebug().WriteToLog()
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if maxDepth > 0 {
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unwrapped := h.lookup(addrs[0].Domain(), option, maxDepth-1)
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if unwrapped != nil {
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return unwrapped
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}
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}
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return addrs
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default: // IP record found, return a non-nil IP array
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return filterIP(addrs, option)
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}
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}
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// Lookup returns IP addresses or proxied domain for the given domain, if exists in this StaticHosts.
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func (h *StaticHosts) Lookup(domain string, option dns.IPOption) []net.Address {
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return h.lookup(domain, option, 5)
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}
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