mirror of
https://github.com/XTLS/Xray-core.git
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114 lines
3.1 KiB
Go
114 lines
3.1 KiB
Go
package dns
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import (
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"context"
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"sort"
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"strconv"
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"github.com/xtls/xray-core/common/errors"
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"github.com/xtls/xray-core/common/net"
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"github.com/xtls/xray-core/common/strmatcher"
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"github.com/xtls/xray-core/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) (*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)+16),
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matchers: g,
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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, errors.New("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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if mapping.ProxiedDomain[0] == '#' {
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rcode, err := strconv.Atoi(mapping.ProxiedDomain[1:])
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if err != nil {
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return nil, err
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}
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ips = append(ips, dns.RCodeError(rcode))
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} else {
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ips = append(ips, net.DomainAddress(mapping.ProxiedDomain))
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}
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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, errors.New("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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}
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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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MatchSlice := h.matchers.Match(domain)
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sort.Slice(MatchSlice, func(i, j int) bool {
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return MatchSlice[i] < MatchSlice[j]
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})
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if len(MatchSlice) == 0 {
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return nil
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}
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return h.ips[MatchSlice[0]]
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}
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func (h *StaticHosts) lookup(domain string, option dns.IPOption, maxDepth int) ([]net.Address, error) {
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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 addrs, nil
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case len(addrs) == 1:
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if err, ok := addrs[0].(dns.RCodeError); ok {
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return nil, err
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}
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if addrs[0].Family().IsDomain() { // Try to unwrap domain
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errors.LogDebug(context.Background(), "found replaced domain: ", domain, " -> ", addrs[0].Domain(), ". Try to unwrap it")
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if maxDepth > 0 {
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unwrapped, err := h.lookup(addrs[0].Domain(), option, maxDepth-1)
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if err != nil {
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return nil, err
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}
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if unwrapped != nil {
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return unwrapped, nil
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}
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}
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return addrs, nil
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}
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fallthrough
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default: // IP record found, return a non-nil IP array
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return filterIP(addrs, option), nil
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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, error) {
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return h.lookup(domain, option, 5)
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}
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