mirror of
https://github.com/SagerNet/sing-box.git
synced 2024-11-22 08:31:30 +00:00
120 lines
3.7 KiB
Go
120 lines
3.7 KiB
Go
package route
|
|
|
|
import (
|
|
"context"
|
|
"net/netip"
|
|
"strings"
|
|
|
|
"github.com/sagernet/sing-box/adapter"
|
|
C "github.com/sagernet/sing-box/constant"
|
|
"github.com/sagernet/sing-box/log"
|
|
"github.com/sagernet/sing-dns"
|
|
E "github.com/sagernet/sing/common/exceptions"
|
|
F "github.com/sagernet/sing/common/format"
|
|
|
|
"golang.org/x/net/dns/dnsmessage"
|
|
)
|
|
|
|
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]))
|
|
}
|
|
ctx, metadata := adapter.AppendContext(ctx)
|
|
if len(message.Questions) > 0 {
|
|
switch message.Questions[0].Type {
|
|
case dnsmessage.TypeA:
|
|
metadata.IPVersion = 4
|
|
case dnsmessage.TypeAAAA:
|
|
metadata.IPVersion = 6
|
|
}
|
|
}
|
|
ctx, transport := r.matchDNS(ctx)
|
|
ctx, cancel := context.WithTimeout(ctx, C.DNSTimeout)
|
|
defer cancel()
|
|
response, err := r.dnsClient.Exchange(ctx, transport, message)
|
|
if err != nil && len(message.Questions) > 0 {
|
|
r.dnsLogger.ErrorContext(ctx, E.Cause(err, "exchange failed for ", message.Questions[0].Name.String()))
|
|
}
|
|
if len(message.Questions) > 0 && response != nil {
|
|
LogDNSAnswers(r.dnsLogger, ctx, message.Questions[0].Name.String(), response.Answers)
|
|
}
|
|
return response, err
|
|
}
|
|
|
|
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, cancel := context.WithTimeout(ctx, C.DNSTimeout)
|
|
defer cancel()
|
|
addrs, err := r.dnsClient.Lookup(ctx, transport, domain, strategy)
|
|
if len(addrs) > 0 {
|
|
r.dnsLogger.InfoContext(ctx, "lookup succeed for ", domain, ": ", strings.Join(F.MapToString(addrs), " "))
|
|
} else {
|
|
r.dnsLogger.ErrorContext(ctx, E.Cause(err, "lookup failed for ", domain))
|
|
}
|
|
return addrs, err
|
|
}
|
|
|
|
func (r *Router) LookupDefault(ctx context.Context, domain string) ([]netip.Addr, error) {
|
|
return r.Lookup(ctx, domain, r.defaultDomainStrategy)
|
|
}
|
|
|
|
func LogDNSAnswers(logger log.ContextLogger, ctx context.Context, domain string, answers []dnsmessage.Resource) {
|
|
for _, rawAnswer := range answers {
|
|
var content string
|
|
switch answer := rawAnswer.Body.(type) {
|
|
case *dnsmessage.AResource:
|
|
content = netip.AddrFrom4(answer.A).String()
|
|
case *dnsmessage.NSResource:
|
|
content = answer.NS.String()
|
|
case *dnsmessage.CNAMEResource:
|
|
content = answer.CNAME.String()
|
|
case *dnsmessage.SOAResource:
|
|
content = answer.MBox.String()
|
|
case *dnsmessage.PTRResource:
|
|
content = answer.PTR.String()
|
|
case *dnsmessage.MXResource:
|
|
content = answer.MX.String()
|
|
case *dnsmessage.TXTResource:
|
|
content = strings.Join(answer.TXT, " ")
|
|
case *dnsmessage.AAAAResource:
|
|
content = netip.AddrFrom16(answer.AAAA).String()
|
|
case *dnsmessage.SRVResource:
|
|
content = answer.Target.String()
|
|
case *dnsmessage.UnknownResource:
|
|
content = answer.Type.String()
|
|
default:
|
|
continue
|
|
}
|
|
rType := formatDNSType(rawAnswer.Header.Type)
|
|
if rType == "" {
|
|
logger.InfoContext(ctx, "exchanged ", domain, " ", rType)
|
|
} else {
|
|
logger.InfoContext(ctx, "exchanged ", domain, " ", rType, " ", content)
|
|
}
|
|
}
|
|
}
|
|
|
|
func formatDNSQuestion(question dnsmessage.Question) string {
|
|
var qType string
|
|
qType = question.Type.String()
|
|
if len(qType) > 4 {
|
|
qType = qType[4:]
|
|
}
|
|
var qClass string
|
|
qClass = question.Class.String()
|
|
if len(qClass) > 5 {
|
|
qClass = qClass[5:]
|
|
}
|
|
return string(question.Name.Data[:question.Name.Length-1]) + " " + qType + " " + qClass
|
|
}
|
|
|
|
func formatDNSType(qType dnsmessage.Type) string {
|
|
qTypeName := qType.String()
|
|
if len(qTypeName) > 4 {
|
|
return qTypeName[4:]
|
|
} else {
|
|
return F.ToString("unknown (type ", qTypeName, ")")
|
|
}
|
|
}
|