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refactor: new dns app

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This commit is contained in:
AkinoKaede
2021-03-18 23:24:24 +08:00
parent 4e63c22197
commit 8884e948fe
24 changed files with 1240 additions and 620 deletions
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57
app/dns/hosts.go
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@ -14,25 +14,6 @@ type StaticHosts struct {
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)
@ -100,24 +81,38 @@ func filterIP(ips []net.Address, option dns.IPOption) []net.Address {
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 dns.IPOption) []net.Address {
indices := h.matchers.Match(domain)
if len(indices) == 0 {
return nil
}
ips := []net.Address{}
for _, id := range indices {
func (h *StaticHosts) lookupInternal(domain string) []net.Address {
var ips []net.Address
for _, id := range h.matchers.Match(domain) {
ips = append(ips, h.ips[id]...)
}
if len(ips) == 1 && ips[0].Family().IsDomain() {
return ips
}
return filterIP(ips, option)
return ips
}
func (h *StaticHosts) lookup(domain string, option dns.IPOption, maxDepth int) []net.Address {
switch addrs := h.lookupInternal(domain); {
case len(addrs) == 0: // Not recorded in static hosts, return nil
return nil
case len(addrs) == 1 && addrs[0].Family().IsDomain(): // Try to unwrap domain
if maxDepth > 0 {
unwrapped := h.lookup(addrs[0].Domain(), option, maxDepth-1)
if unwrapped != nil {
return unwrapped
}
}
return addrs
default: // IP record found, return a non-nil IP array
return filterIP(addrs, option)
}
}
// 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 {
return h.lookup(domain, option, 5)
}