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Add strategy setting for each dns server

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This commit is contained in:
世界
2022-08-22 12:01:50 +08:00
parent 83cea9475d
commit ac0ead1473
6 changed files with 47 additions and 35 deletions
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36
route/router_dns.go
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@@ -15,6 +15,31 @@ import (
"golang.org/x/net/dns/dnsmessage"
)
func (r *Router) matchDNS(ctx context.Context) (context.Context, dns.Transport, dns.DomainStrategy) {
metadata := adapter.ContextFrom(ctx)
if metadata == nil {
panic("no context")
}
for i, rule := range r.dnsRules {
if rule.Match(metadata) {
if rule.DisableCache() {
ctx = dns.ContextWithDisableCache(ctx, true)
}
detour := rule.Outbound()
r.dnsLogger.DebugContext(ctx, "match[", i, "] ", rule.String(), " => ", detour)
if transport, loaded := r.transportMap[detour]; loaded {
if domainStrategy, dsLoaded := r.transportDomainStrategy[transport]; dsLoaded {
return ctx, transport, domainStrategy
} else {
return ctx, transport, r.defaultDomainStrategy
}
}
r.dnsLogger.ErrorContext(ctx, "transport not found: ", detour)
}
}
return ctx, r.defaultTransport, r.defaultDomainStrategy
}
func (r *Router) Exchange(ctx context.Context, message *dnsmessage.Message) (*dnsmessage.Message, error) {
if len(message.Questions) > 0 {
r.dnsLogger.DebugContext(ctx, "exchange ", formatDNSQuestion(message.Questions[0]))
@@ -28,10 +53,10 @@ func (r *Router) Exchange(ctx context.Context, message *dnsmessage.Message) (*dn
metadata.IPVersion = 6
}
}
ctx, transport := r.matchDNS(ctx)
ctx, transport, strategy := r.matchDNS(ctx)
ctx, cancel := context.WithTimeout(ctx, C.DNSTimeout)
defer cancel()
response, err := r.dnsClient.Exchange(ctx, transport, message)
response, err := r.dnsClient.Exchange(ctx, transport, message, strategy)
if err != nil && len(message.Questions) > 0 {
r.dnsLogger.ErrorContext(ctx, E.Cause(err, "exchange failed for ", message.Questions[0].Name.String()))
}
@@ -43,7 +68,10 @@ func (r *Router) Exchange(ctx context.Context, message *dnsmessage.Message) (*dn
func (r *Router) Lookup(ctx context.Context, domain string, strategy dns.DomainStrategy) ([]netip.Addr, error) {
r.dnsLogger.DebugContext(ctx, "lookup domain ", domain)
ctx, transport := r.matchDNS(ctx)
ctx, transport, transportStrategy := r.matchDNS(ctx)
if strategy == dns.DomainStrategyAsIS {
strategy = transportStrategy
}
ctx, cancel := context.WithTimeout(ctx, C.DNSTimeout)
defer cancel()
addrs, err := r.dnsClient.Lookup(ctx, transport, domain, strategy)
@@ -56,7 +84,7 @@ func (r *Router) Lookup(ctx context.Context, domain string, strategy dns.DomainS
}
func (r *Router) LookupDefault(ctx context.Context, domain string) ([]netip.Addr, error) {
return r.Lookup(ctx, domain, r.defaultDomainStrategy)
return r.Lookup(ctx, domain, dns.DomainStrategyAsIS)
}
func LogDNSAnswers(logger log.ContextLogger, ctx context.Context, domain string, answers []dnsmessage.Resource) {