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