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DNS hosts: Support returning RCode (#4681)

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j2rong4cn 2025-07-23 18:11:43 +08:00 • committed by GitHub
parent f90fae22aa
commit 923b5d7229
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GPG key ID: B5690EEEBB952194
4 changed files with 76 additions and 18 deletions
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47
app/dns/hosts.go
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@ -2,6 +2,8 @@ package dns
import (
"context"
"strconv"
"github.com/xtls/xray-core/common/errors"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/strmatcher"
@ -31,7 +33,15 @@ func NewStaticHosts(hosts []*Config_HostMapping) (*StaticHosts, error) {
ips := make([]net.Address, 0, len(mapping.Ip)+1)
switch {
case len(mapping.ProxiedDomain) > 0:
ips = append(ips, net.DomainAddress(mapping.ProxiedDomain))
if mapping.ProxiedDomain[0] == '#' {
rcode, err := strconv.Atoi(mapping.ProxiedDomain[1:])
if err != nil {
return nil, err
}
ips = append(ips, dns.RCodeError(rcode))
} else {
ips = append(ips, net.DomainAddress(mapping.ProxiedDomain))
}
case len(mapping.Ip) > 0:
for _, ip := range mapping.Ip {
addr := net.IPAddress(ip)
@ -58,38 +68,51 @@ func filterIP(ips []net.Address, option dns.IPOption) []net.Address {
return filtered
}
func (h *StaticHosts) lookupInternal(domain string) []net.Address {
func (h *StaticHosts) lookupInternal(domain string) ([]net.Address, error) {
ips := make([]net.Address, 0)
found := false
for _, id := range h.matchers.Match(domain) {
for _, v := range h.ips[id] {
if err, ok := v.(dns.RCodeError); ok {
if uint16(err) == 0 {
return nil, dns.ErrEmptyResponse
}
return nil, err
}
}
ips = append(ips, h.ips[id]...)
found = true
}
if !found {
return nil
return nil, nil
}
return ips
return ips, nil
}
func (h *StaticHosts) lookup(domain string, option dns.IPOption, maxDepth int) []net.Address {
switch addrs := h.lookupInternal(domain); {
func (h *StaticHosts) lookup(domain string, option dns.IPOption, maxDepth int) ([]net.Address, error) {
switch addrs, err := h.lookupInternal(domain); {
case err != nil:
return nil, err
case len(addrs) == 0: // Not recorded in static hosts, return nil
return addrs
return addrs, nil
case len(addrs) == 1 && addrs[0].Family().IsDomain(): // Try to unwrap domain
errors.LogDebug(context.Background(), "found replaced domain: ", domain, " -> ", addrs[0].Domain(), ". Try to unwrap it")
if maxDepth > 0 {
unwrapped := h.lookup(addrs[0].Domain(), option, maxDepth-1)
unwrapped, err := h.lookup(addrs[0].Domain(), option, maxDepth-1)
if err != nil {
return nil, err
}
if unwrapped != nil {
return unwrapped
return unwrapped, nil
}
}
return addrs
return addrs, nil
default: // IP record found, return a non-nil IP array
return filterIP(addrs, option)
return filterIP(addrs, option), nil
}
}
// Lookup returns IP addresses or proxied domain for the given domain, if exists in this StaticHosts.
func (h *StaticHosts) Lookup(domain string, option dns.IPOption) []net.Address {
func (h *StaticHosts) Lookup(domain string, option dns.IPOption) ([]net.Address, error) {
return h.lookup(domain, option, 5)
}